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* pull request: batman-adv 2013-10-13
@ 2013-10-13 11:22 ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem-fT/PcQaiUtIeIZ0/mPfg9Q
  Cc: netdev-u79uwXL29TY76Z2rM5mHXA,
	b.a.t.m.a.n-ZwoEplunGu2X36UT3dwllkB+6BGkLq7r

Hello David,

this is our second pull request intended for net-next/linux-3.13.

The most important piece in this patchset is the new packet fragmentation code
implemented by Martin Hundebøll during his Google Summer of Code 2012[1]. This
code is entirely substituting the current fragmentation mechanism.

Other than this you have:
- the creation of a common BAT ICMP header which makes the ICMP subsystem more
  flexible and extensible
- the addition of a dummy rx mode handler for the soft-interface which allows
  users to set static multicast listeners
- some minor improvements and code cleanups


Please pull or let me know of any problem.

Thank you very much,
		Antonio


[1] http://www.open-mesh.org/projects/batman-adv/wiki/Fragmentation


The following changes since commit ccdbb6e96beca362db876d820ac1e560ff6d9579:

  tcp: tcp_transmit_skb() optimizations (2013-10-11 17:48:18 -0400)

are available in the git repository at:

  git://git.open-mesh.org/linux-merge.git tags/batman-adv-for-davem

for you to fetch changes up to a4deee1ad42d93746562fe7de2149729017e3fd1:

  batman-adv: Add dummy soft-interface rx mode handler (2013-10-12 17:17:12 +0200)

----------------------------------------------------------------
Included changes:
- ensure RecordRoute information is added to BAT_ICMP echo_request/reply only
- use VLAN_ETH_HLEN when possible
- use htons when possible
- substitute old fragmentation code with a new improved implementation by
  Martin Hundebøll
- create common header for BAT_ICMP packets to improve extendibility
- consider the network coding overhead when computing the overall room needed by
  batman headers
- add dummy soft-interface rx mode handler
- minor code refactoring and cleanups

----------------------------------------------------------------
Antonio Quartulli (9):
      batman-adv: make tt_global_add static and return bool
      batman-adv: remove batadv_tt_global_add_orig declaration
      batman-adv: don't use call_rcu if not needed
      batman-adv: h_vlan_encapsulated_proto access refactoring
      batman-adv: use VLAN_ETH_HLEN instead of sizeof(struct vlan_eth_hdr)
      batman-adv: use htons when possible
      batman-adv: create common header for ICMP packets
      batman-adv: implement batadv_tt_entries
      batman-adv: make batadv_tt_save_orig_buffer() generic

Linus Lüssing (1):
      batman-adv: Add dummy soft-interface rx mode handler

Marek Lindner (1):
      batman-adv: consider network coding overhead when calculating required mtu

Martin Hundebøll (3):
      batman-adv: Remove old fragmentation code
      batman-adv: Receive fragmented packets and merge
      batman-adv: Fragment and send skbs larger than mtu

Simon Wunderlich (2):
      batman-adv: only add recordroute information to icmp request/reply
      batman-adv: remove useless find_router look up

 net/batman-adv/Makefile                |   2 +-
 net/batman-adv/bridge_loop_avoidance.c |  14 +-
 net/batman-adv/distributed-arp-table.c |  11 +-
 net/batman-adv/fragmentation.c         | 491 +++++++++++++++++++++++++++++++++
 net/batman-adv/fragmentation.h         |  50 ++++
 net/batman-adv/gateway_client.c        |  23 +-
 net/batman-adv/hard-interface.c        |  22 +-
 net/batman-adv/icmp_socket.c           |  22 +-
 net/batman-adv/main.c                  |  37 ++-
 net/batman-adv/main.h                  |  10 +
 net/batman-adv/originator.c            |  19 +-
 net/batman-adv/packet.h                |  79 ++++--
 net/batman-adv/routing.c               | 185 ++++++-------
 net/batman-adv/routing.h               |   4 +-
 net/batman-adv/send.c                  | 186 ++++++++++++-
 net/batman-adv/send.h                  |  40 +++
 net/batman-adv/soft-interface.c        |  34 ++-
 net/batman-adv/translation-table.c     |  63 +++--
 net/batman-adv/translation-table.h     |   7 -
 net/batman-adv/types.h                 |  70 +++--
 net/batman-adv/unicast.c               | 491 ---------------------------------
 net/batman-adv/unicast.h               |  92 ------
 22 files changed, 1105 insertions(+), 847 deletions(-)
 create mode 100644 net/batman-adv/fragmentation.c
 create mode 100644 net/batman-adv/fragmentation.h
 delete mode 100644 net/batman-adv/unicast.c
 delete mode 100644 net/batman-adv/unicast.h

^ permalink raw reply	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] pull request: batman-adv 2013-10-13
@ 2013-10-13 11:22 ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n

Hello David,

this is our second pull request intended for net-next/linux-3.13.

The most important piece in this patchset is the new packet fragmentation code
implemented by Martin Hundebøll during his Google Summer of Code 2012[1]. This
code is entirely substituting the current fragmentation mechanism.

Other than this you have:
- the creation of a common BAT ICMP header which makes the ICMP subsystem more
  flexible and extensible
- the addition of a dummy rx mode handler for the soft-interface which allows
  users to set static multicast listeners
- some minor improvements and code cleanups


Please pull or let me know of any problem.

Thank you very much,
		Antonio


[1] http://www.open-mesh.org/projects/batman-adv/wiki/Fragmentation


The following changes since commit ccdbb6e96beca362db876d820ac1e560ff6d9579:

  tcp: tcp_transmit_skb() optimizations (2013-10-11 17:48:18 -0400)

are available in the git repository at:

  git://git.open-mesh.org/linux-merge.git tags/batman-adv-for-davem

for you to fetch changes up to a4deee1ad42d93746562fe7de2149729017e3fd1:

  batman-adv: Add dummy soft-interface rx mode handler (2013-10-12 17:17:12 +0200)

----------------------------------------------------------------
Included changes:
- ensure RecordRoute information is added to BAT_ICMP echo_request/reply only
- use VLAN_ETH_HLEN when possible
- use htons when possible
- substitute old fragmentation code with a new improved implementation by
  Martin Hundebøll
- create common header for BAT_ICMP packets to improve extendibility
- consider the network coding overhead when computing the overall room needed by
  batman headers
- add dummy soft-interface rx mode handler
- minor code refactoring and cleanups

----------------------------------------------------------------
Antonio Quartulli (9):
      batman-adv: make tt_global_add static and return bool
      batman-adv: remove batadv_tt_global_add_orig declaration
      batman-adv: don't use call_rcu if not needed
      batman-adv: h_vlan_encapsulated_proto access refactoring
      batman-adv: use VLAN_ETH_HLEN instead of sizeof(struct vlan_eth_hdr)
      batman-adv: use htons when possible
      batman-adv: create common header for ICMP packets
      batman-adv: implement batadv_tt_entries
      batman-adv: make batadv_tt_save_orig_buffer() generic

Linus Lüssing (1):
      batman-adv: Add dummy soft-interface rx mode handler

Marek Lindner (1):
      batman-adv: consider network coding overhead when calculating required mtu

Martin Hundebøll (3):
      batman-adv: Remove old fragmentation code
      batman-adv: Receive fragmented packets and merge
      batman-adv: Fragment and send skbs larger than mtu

Simon Wunderlich (2):
      batman-adv: only add recordroute information to icmp request/reply
      batman-adv: remove useless find_router look up

 net/batman-adv/Makefile                |   2 +-
 net/batman-adv/bridge_loop_avoidance.c |  14 +-
 net/batman-adv/distributed-arp-table.c |  11 +-
 net/batman-adv/fragmentation.c         | 491 +++++++++++++++++++++++++++++++++
 net/batman-adv/fragmentation.h         |  50 ++++
 net/batman-adv/gateway_client.c        |  23 +-
 net/batman-adv/hard-interface.c        |  22 +-
 net/batman-adv/icmp_socket.c           |  22 +-
 net/batman-adv/main.c                  |  37 ++-
 net/batman-adv/main.h                  |  10 +
 net/batman-adv/originator.c            |  19 +-
 net/batman-adv/packet.h                |  79 ++++--
 net/batman-adv/routing.c               | 185 ++++++-------
 net/batman-adv/routing.h               |   4 +-
 net/batman-adv/send.c                  | 186 ++++++++++++-
 net/batman-adv/send.h                  |  40 +++
 net/batman-adv/soft-interface.c        |  34 ++-
 net/batman-adv/translation-table.c     |  63 +++--
 net/batman-adv/translation-table.h     |   7 -
 net/batman-adv/types.h                 |  70 +++--
 net/batman-adv/unicast.c               | 491 ---------------------------------
 net/batman-adv/unicast.h               |  92 ------
 22 files changed, 1105 insertions(+), 847 deletions(-)
 create mode 100644 net/batman-adv/fragmentation.c
 create mode 100644 net/batman-adv/fragmentation.h
 delete mode 100644 net/batman-adv/unicast.c
 delete mode 100644 net/batman-adv/unicast.h


^ permalink raw reply	[flat|nested] 36+ messages in thread
* [PATCH 01/16] batman-adv: only add recordroute information to icmp request/reply
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22     ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem-fT/PcQaiUtIeIZ0/mPfg9Q
  Cc: netdev-u79uwXL29TY76Z2rM5mHXA,
	b.a.t.m.a.n-ZwoEplunGu2X36UT3dwllkB+6BGkLq7r, Simon Wunderlich,
	Antonio Quartulli, Marek Lindner

From: Simon Wunderlich <simon.wunderlich-Y4E02TeZ33kaBlGTGt4zH4SGEyLTKazZ@public.gmane.org>

Adding host information for record route is only required for ICMP
requests and replys, and should not be added to just any (future?)
packet type.

Signed-off-by: Simon Wunderlich <siwu-MaAgPAbsBIVS8oHt8HbXEIQuADTiUCJX@public.gmane.org>
Signed-off-by: Marek Lindner <lindner_marek-LWAfsSFWpa4@public.gmane.org>
Signed-off-by: Antonio Quartulli <antonio-x4xJYDvStAgysxA8WJXlww@public.gmane.org>
---
 net/batman-adv/routing.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 457dfef..0dc1c0e 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -379,7 +379,9 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
 	/* add record route information if not full */
-	if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) &&
+	if ((icmp_packet->msg_type == BATADV_ECHO_REPLY ||
+	     icmp_packet->msg_type == BATADV_ECHO_REQUEST) &&
+	    (hdr_size == sizeof(struct batadv_icmp_packet_rr)) &&
 	    (icmp_packet->rr_cur < BATADV_RR_LEN)) {
 		memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 		       ethhdr->h_dest, ETH_ALEN);
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 01/16] batman-adv: only add recordroute information to icmp request/reply
@ 2013-10-13 11:22     ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, b.a.t.m.a.n, Simon Wunderlich, Antonio Quartulli, Marek Lindner

From: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>

Adding host information for record route is only required for ICMP
requests and replys, and should not be added to just any (future?)
packet type.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/routing.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 457dfef..0dc1c0e 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -379,7 +379,9 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
 	/* add record route information if not full */
-	if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) &&
+	if ((icmp_packet->msg_type == BATADV_ECHO_REPLY ||
+	     icmp_packet->msg_type == BATADV_ECHO_REQUEST) &&
+	    (hdr_size == sizeof(struct batadv_icmp_packet_rr)) &&
 	    (icmp_packet->rr_cur < BATADV_RR_LEN)) {
 		memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
 		       ethhdr->h_dest, ETH_ALEN);
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 02/16] batman-adv: make tt_global_add static and return bool
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <ordex@autistici.org>

batadv_tt_global_add is not used anymore outside of the TT
code thanks to the TVLV implementation. It can therefore be
declared as static

Last user has been removed by 3de4e64df0f1326db7cc0ef25f5af8522850252d
("batman-adv: tvlv - convert roaming adv packet to use tvlv unicast packets")

Moreover make it return bool since its result can be either 0 or 1.

Reported-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 14 ++++++++------
 net/batman-adv/translation-table.h |  4 ----
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index c741694..b3c4369 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -805,15 +805,17 @@ out:
  * If a TT local entry exists for this non-mesh client remove it.
  *
  * The caller must hold orig_node refcount.
+ *
+ * Return true if the new entry has been added, false otherwise
  */
-int batadv_tt_global_add(struct batadv_priv *bat_priv,
-			 struct batadv_orig_node *orig_node,
-			 const unsigned char *tt_addr, uint16_t flags,
-			 uint8_t ttvn)
+static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
+				 struct batadv_orig_node *orig_node,
+				 const unsigned char *tt_addr, uint16_t flags,
+				 uint8_t ttvn)
 {
 	struct batadv_tt_global_entry *tt_global_entry;
 	struct batadv_tt_local_entry *tt_local_entry;
-	int ret = 0;
+	bool ret = false;
 	int hash_added;
 	struct batadv_tt_common_entry *common;
 	uint16_t local_flags;
@@ -914,7 +916,7 @@ add_orig_entry:
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
 		   "Creating new global tt entry: %pM (via %pM)\n",
 		   common->addr, orig_node->orig);
-	ret = 1;
+	ret = true;
 
 out_remove:
 
diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h
index b4b6dea..fb710c5 100644
--- a/net/batman-adv/translation-table.h
+++ b/net/batman-adv/translation-table.h
@@ -30,10 +30,6 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset);
 void batadv_tt_global_add_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
 			       const unsigned char *tt_buff, int tt_buff_len);
-int batadv_tt_global_add(struct batadv_priv *bat_priv,
-			 struct batadv_orig_node *orig_node,
-			 const unsigned char *addr, uint16_t flags,
-			 uint8_t ttvn);
 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset);
 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 02/16] batman-adv: make tt_global_add static and return bool
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <ordex@autistici.org>

batadv_tt_global_add is not used anymore outside of the TT
code thanks to the TVLV implementation. It can therefore be
declared as static

Last user has been removed by 3de4e64df0f1326db7cc0ef25f5af8522850252d
("batman-adv: tvlv - convert roaming adv packet to use tvlv unicast packets")

Moreover make it return bool since its result can be either 0 or 1.

Reported-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 14 ++++++++------
 net/batman-adv/translation-table.h |  4 ----
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index c741694..b3c4369 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -805,15 +805,17 @@ out:
  * If a TT local entry exists for this non-mesh client remove it.
  *
  * The caller must hold orig_node refcount.
+ *
+ * Return true if the new entry has been added, false otherwise
  */
-int batadv_tt_global_add(struct batadv_priv *bat_priv,
-			 struct batadv_orig_node *orig_node,
-			 const unsigned char *tt_addr, uint16_t flags,
-			 uint8_t ttvn)
+static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
+				 struct batadv_orig_node *orig_node,
+				 const unsigned char *tt_addr, uint16_t flags,
+				 uint8_t ttvn)
 {
 	struct batadv_tt_global_entry *tt_global_entry;
 	struct batadv_tt_local_entry *tt_local_entry;
-	int ret = 0;
+	bool ret = false;
 	int hash_added;
 	struct batadv_tt_common_entry *common;
 	uint16_t local_flags;
@@ -914,7 +916,7 @@ add_orig_entry:
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
 		   "Creating new global tt entry: %pM (via %pM)\n",
 		   common->addr, orig_node->orig);
-	ret = 1;
+	ret = true;
 
 out_remove:
 
diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h
index b4b6dea..fb710c5 100644
--- a/net/batman-adv/translation-table.h
+++ b/net/batman-adv/translation-table.h
@@ -30,10 +30,6 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset);
 void batadv_tt_global_add_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
 			       const unsigned char *tt_buff, int tt_buff_len);
-int batadv_tt_global_add(struct batadv_priv *bat_priv,
-			 struct batadv_orig_node *orig_node,
-			 const unsigned char *addr, uint16_t flags,
-			 uint8_t ttvn);
 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset);
 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 03/16] batman-adv: remove batadv_tt_global_add_orig declaration
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <ordex@autistici.org>

batadv_tt_global_add_orig is neither used nor implemented
anymore, therefore it is possible to remove its declaration

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h
index fb710c5..015d8b9 100644
--- a/net/batman-adv/translation-table.h
+++ b/net/batman-adv/translation-table.h
@@ -27,9 +27,6 @@ uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
 				const uint8_t *addr, const char *message,
 				bool roaming);
 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset);
-void batadv_tt_global_add_orig(struct batadv_priv *bat_priv,
-			       struct batadv_orig_node *orig_node,
-			       const unsigned char *tt_buff, int tt_buff_len);
 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset);
 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 03/16] batman-adv: remove batadv_tt_global_add_orig declaration
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <ordex@autistici.org>

batadv_tt_global_add_orig is neither used nor implemented
anymore, therefore it is possible to remove its declaration

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h
index fb710c5..015d8b9 100644
--- a/net/batman-adv/translation-table.h
+++ b/net/batman-adv/translation-table.h
@@ -27,9 +27,6 @@ uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
 				const uint8_t *addr, const char *message,
 				bool roaming);
 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset);
-void batadv_tt_global_add_orig(struct batadv_priv *bat_priv,
-			       struct batadv_orig_node *orig_node,
-			       const unsigned char *tt_buff, int tt_buff_len);
 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset);
 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 04/16] batman-adv: don't use call_rcu if not needed
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <ordex@autistici.org>

batadv_tt_global_entry_free_ref uses call_rcu to schedule a
function which will only free the global entry itself.

For this reason call_rcu is useless and kfree_rcu can be
used to simplify the code.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index b3c4369..34fa6cc 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -117,25 +117,17 @@ batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 		kfree_rcu(tt_local_entry, common.rcu);
 }
 
-static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
-{
-	struct batadv_tt_common_entry *tt_common_entry;
-	struct batadv_tt_global_entry *tt_global_entry;
-
-	tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu);
-	tt_global_entry = container_of(tt_common_entry,
-				       struct batadv_tt_global_entry, common);
-
-	kfree(tt_global_entry);
-}
-
+/**
+ * batadv_tt_global_entry_free_ref - decrement the refcounter for a
+ *  tt_global_entry and possibly free it
+ * @tt_global_entry: the object to free
+ */
 static void
 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 {
 	if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 		batadv_tt_global_del_orig_list(tt_global_entry);
-		call_rcu(&tt_global_entry->common.rcu,
-			 batadv_tt_global_entry_free_rcu);
+		kfree_rcu(tt_global_entry, common.rcu);
 	}
 }
 
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 04/16] batman-adv: don't use call_rcu if not needed
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <ordex@autistici.org>

batadv_tt_global_entry_free_ref uses call_rcu to schedule a
function which will only free the global entry itself.

For this reason call_rcu is useless and kfree_rcu can be
used to simplify the code.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index b3c4369..34fa6cc 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -117,25 +117,17 @@ batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 		kfree_rcu(tt_local_entry, common.rcu);
 }
 
-static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
-{
-	struct batadv_tt_common_entry *tt_common_entry;
-	struct batadv_tt_global_entry *tt_global_entry;
-
-	tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu);
-	tt_global_entry = container_of(tt_common_entry,
-				       struct batadv_tt_global_entry, common);
-
-	kfree(tt_global_entry);
-}
-
+/**
+ * batadv_tt_global_entry_free_ref - decrement the refcounter for a
+ *  tt_global_entry and possibly free it
+ * @tt_global_entry: the object to free
+ */
 static void
 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 {
 	if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 		batadv_tt_global_del_orig_list(tt_global_entry);
-		call_rcu(&tt_global_entry->common.rcu,
-			 batadv_tt_global_entry_free_rcu);
+		kfree_rcu(tt_global_entry, common.rcu);
 	}
 }
 
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 05/16] batman-adv: h_vlan_encapsulated_proto access refactoring
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <ordex@autistici.org>

In case of a VLAN tagged frame the ethhdr pointer is
moved forward by 4 bytes so that the offset of h_proto
in struct ethhdr matches the real
h_vlan_encapsulated_proto address in the skb. While this
trickery is correct it makes the code harder to understand
and may lead to bugs in case of re-use of ethhdr for other
purposes.

This patch introduces a proto variable to make things
cleaner and easier to understand.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/gateway_client.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 1bce63a..ac97ca7 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -655,24 +655,29 @@ bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len)
 	struct iphdr *iphdr;
 	struct ipv6hdr *ipv6hdr;
 	struct udphdr *udphdr;
+	struct vlan_ethhdr *vhdr;
+	__be16 proto;
 
 	/* check for ethernet header */
 	if (!pskb_may_pull(skb, *header_len + ETH_HLEN))
 		return false;
 	ethhdr = (struct ethhdr *)skb->data;
+	proto = ethhdr->h_proto;
 	*header_len += ETH_HLEN;
 
 	/* check for initial vlan header */
-	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
+	if (proto == htons(ETH_P_8021Q)) {
 		if (!pskb_may_pull(skb, *header_len + VLAN_HLEN))
 			return false;
-		ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
+
+		vhdr = (struct vlan_ethhdr *)skb->data;
+		proto = vhdr->h_vlan_encapsulated_proto;
 		*header_len += VLAN_HLEN;
 	}
 
 	/* check for ip header */
-	switch (ntohs(ethhdr->h_proto)) {
-	case ETH_P_IP:
+	switch (proto) {
+	case htons(ETH_P_IP):
 		if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr)))
 			return false;
 		iphdr = (struct iphdr *)(skb->data + *header_len);
@@ -683,7 +688,7 @@ bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len)
 			return false;
 
 		break;
-	case ETH_P_IPV6:
+	case htons(ETH_P_IPV6):
 		if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr)))
 			return false;
 		ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len);
@@ -710,11 +715,11 @@ bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len)
 	*header_len += sizeof(*udphdr);
 
 	/* check for bootp port */
-	if ((ntohs(ethhdr->h_proto) == ETH_P_IP) &&
+	if ((proto == htons(ETH_P_IP)) &&
 	    (ntohs(udphdr->dest) != 67))
 		return false;
 
-	if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) &&
+	if ((proto == htons(ETH_P_IPV6)) &&
 	    (ntohs(udphdr->dest) != 547))
 		return false;
 
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 05/16] batman-adv: h_vlan_encapsulated_proto access refactoring
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <ordex@autistici.org>

In case of a VLAN tagged frame the ethhdr pointer is
moved forward by 4 bytes so that the offset of h_proto
in struct ethhdr matches the real
h_vlan_encapsulated_proto address in the skb. While this
trickery is correct it makes the code harder to understand
and may lead to bugs in case of re-use of ethhdr for other
purposes.

This patch introduces a proto variable to make things
cleaner and easier to understand.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/gateway_client.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 1bce63a..ac97ca7 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -655,24 +655,29 @@ bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len)
 	struct iphdr *iphdr;
 	struct ipv6hdr *ipv6hdr;
 	struct udphdr *udphdr;
+	struct vlan_ethhdr *vhdr;
+	__be16 proto;
 
 	/* check for ethernet header */
 	if (!pskb_may_pull(skb, *header_len + ETH_HLEN))
 		return false;
 	ethhdr = (struct ethhdr *)skb->data;
+	proto = ethhdr->h_proto;
 	*header_len += ETH_HLEN;
 
 	/* check for initial vlan header */
-	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
+	if (proto == htons(ETH_P_8021Q)) {
 		if (!pskb_may_pull(skb, *header_len + VLAN_HLEN))
 			return false;
-		ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
+
+		vhdr = (struct vlan_ethhdr *)skb->data;
+		proto = vhdr->h_vlan_encapsulated_proto;
 		*header_len += VLAN_HLEN;
 	}
 
 	/* check for ip header */
-	switch (ntohs(ethhdr->h_proto)) {
-	case ETH_P_IP:
+	switch (proto) {
+	case htons(ETH_P_IP):
 		if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr)))
 			return false;
 		iphdr = (struct iphdr *)(skb->data + *header_len);
@@ -683,7 +688,7 @@ bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len)
 			return false;
 
 		break;
-	case ETH_P_IPV6:
+	case htons(ETH_P_IPV6):
 		if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr)))
 			return false;
 		ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len);
@@ -710,11 +715,11 @@ bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len)
 	*header_len += sizeof(*udphdr);
 
 	/* check for bootp port */
-	if ((ntohs(ethhdr->h_proto) == ETH_P_IP) &&
+	if ((proto == htons(ETH_P_IP)) &&
 	    (ntohs(udphdr->dest) != 67))
 		return false;
 
-	if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) &&
+	if ((proto == htons(ETH_P_IPV6)) &&
 	    (ntohs(udphdr->dest) != 547))
 		return false;
 
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 06/16] batman-adv: use VLAN_ETH_HLEN instead of sizeof(struct vlan_eth_hdr)
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <ordex@autistici.org>

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/bridge_loop_avoidance.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 264de88..70da18a 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -1380,7 +1380,7 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb,
 	ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
 
 	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
-		if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr)))
+		if (!pskb_may_pull(skb, hdr_size + VLAN_ETH_HLEN))
 			return 0;
 
 		vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size);
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 06/16] batman-adv: use VLAN_ETH_HLEN instead of sizeof(struct vlan_eth_hdr)
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <ordex@autistici.org>

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/bridge_loop_avoidance.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 264de88..70da18a 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -1380,7 +1380,7 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb,
 	ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
 
 	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
-		if (!pskb_may_pull(skb, hdr_size + sizeof(struct vlan_ethhdr)))
+		if (!pskb_may_pull(skb, hdr_size + VLAN_ETH_HLEN))
 			return 0;
 
 		vhdr = (struct vlan_ethhdr *)(skb->data + hdr_size);
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 07/16] batman-adv: Remove old fragmentation code
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, b.a.t.m.a.n, Martin Hundebøll, Marek Lindner,
	Antonio Quartulli

From: Martin Hundebøll <martin@hundeboll.net>

Remove the existing fragmentation code before adding the new version
and delete unicast.{h,c}.

batadv_unicast_send_skb() is moved to send.c and renamed to
batadv_send_skb_unicast().

fragmentation entry in sysfs (bat_priv->fragmentation) is kept for use in
the new fragmentation code.

BATADV_UNICAST_FRAG packet type is renamed to BATADV_FRAG for use in the
new fragmentation code.

Signed-off-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/Makefile                |   1 -
 net/batman-adv/distributed-arp-table.c |  11 +-
 net/batman-adv/hard-interface.c        |   1 -
 net/batman-adv/main.c                  |   4 -
 net/batman-adv/originator.c            |   9 -
 net/batman-adv/packet.h                |  16 --
 net/batman-adv/routing.c               |  86 +-----
 net/batman-adv/routing.h               |   2 -
 net/batman-adv/send.c                  | 174 ++++++++++++
 net/batman-adv/send.h                  |  40 +++
 net/batman-adv/soft-interface.c        |   4 +-
 net/batman-adv/types.h                 |  19 --
 net/batman-adv/unicast.c               | 491 ---------------------------------
 net/batman-adv/unicast.h               |  92 ------
 14 files changed, 221 insertions(+), 729 deletions(-)
 delete mode 100644 net/batman-adv/unicast.c
 delete mode 100644 net/batman-adv/unicast.h

diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile
index 8ddbfe6..f9b465b 100644
--- a/net/batman-adv/Makefile
+++ b/net/batman-adv/Makefile
@@ -37,4 +37,3 @@ batman-adv-y += send.o
 batman-adv-y += soft-interface.o
 batman-adv-y += sysfs.o
 batman-adv-y += translation-table.o
-batman-adv-y += unicast.o
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index f07ec32..99da412 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -29,7 +29,6 @@
 #include "send.h"
 #include "types.h"
 #include "translation-table.h"
-#include "unicast.h"
 
 static void batadv_dat_purge(struct work_struct *work);
 
@@ -592,9 +591,9 @@ static bool batadv_dat_send_data(struct batadv_priv *bat_priv,
 			goto free_orig;
 
 		tmp_skb = pskb_copy(skb, GFP_ATOMIC);
-		if (!batadv_unicast_4addr_prepare_skb(bat_priv, tmp_skb,
-						      cand[i].orig_node,
-						      packet_subtype)) {
+		if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb,
+							   cand[i].orig_node,
+							   packet_subtype)) {
 			kfree_skb(tmp_skb);
 			goto free_neigh;
 		}
@@ -990,10 +989,10 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
 	 * that a node not using the 4addr packet format doesn't support it.
 	 */
 	if (hdr_size == sizeof(struct batadv_unicast_4addr_packet))
-		err = batadv_unicast_4addr_send_skb(bat_priv, skb_new,
+		err = batadv_send_skb_unicast_4addr(bat_priv, skb_new,
 						    BATADV_P_DAT_CACHE_REPLY);
 	else
-		err = batadv_unicast_send_skb(bat_priv, skb_new);
+		err = batadv_send_skb_unicast(bat_priv, skb_new);
 
 	if (!err) {
 		batadv_inc_counter(bat_priv, BATADV_CNT_DAT_CACHED_REPLY_TX);
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index eeb6671..0c8602e 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -444,7 +444,6 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 	dev_add_pack(&hard_iface->batman_adv_ptype);
 
-	atomic_set(&hard_iface->frag_seqno, 1);
 	batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 		    hard_iface->net_dev->name);
 
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 8b195e6..8822fad 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -36,7 +36,6 @@
 #include "gateway_client.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
-#include "unicast.h"
 #include "gateway_common.h"
 #include "hash.h"
 #include "bat_algo.h"
@@ -399,7 +398,6 @@ static void batadv_recv_handler_init(void)
 	/* compile time checks for struct member offsets */
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4);
-	BUILD_BUG_ON(offsetof(struct batadv_unicast_frag_packet, dest) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4);
@@ -412,8 +410,6 @@ static void batadv_recv_handler_init(void)
 	batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
 	/* unicast packet */
 	batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
-	/* fragmented unicast packet */
-	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
 	/* unicast tvlv packet */
 	batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
 	/* batman icmp packet */
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 5d53d2f..898b0ce 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -25,7 +25,6 @@
 #include "routing.h"
 #include "gateway_client.h"
 #include "hard-interface.h"
-#include "unicast.h"
 #include "soft-interface.h"
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
@@ -146,7 +145,6 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 	/* Free nc_nodes */
 	batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 
-	batadv_frag_list_free(&orig_node->frag_list);
 	batadv_tt_global_del_orig(orig_node->bat_priv, orig_node,
 				  "originator timed out");
 
@@ -269,9 +267,6 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 	size = bat_priv->num_ifaces * sizeof(uint8_t);
 	orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 
-	INIT_LIST_HEAD(&orig_node->frag_list);
-	orig_node->last_frag_packet = 0;
-
 	if (!orig_node->bcast_own_sum)
 		goto free_bcast_own;
 
@@ -393,10 +388,6 @@ static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 				batadv_orig_node_free_ref(orig_node);
 				continue;
 			}
-
-			if (batadv_has_timed_out(orig_node->last_frag_packet,
-						 BATADV_FRAG_TIMEOUT))
-				batadv_frag_list_free(&orig_node->frag_list);
 		}
 		spin_unlock_bh(list_lock);
 	}
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index 4361bae..5e3b102 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -91,12 +91,6 @@ enum batadv_icmp_packettype {
 	BATADV_PARAMETER_PROBLEM       = 12,
 };
 
-/* fragmentation defines */
-enum batadv_unicast_frag_flags {
-	BATADV_UNI_FRAG_HEAD	  = BIT(0),
-	BATADV_UNI_FRAG_LARGETAIL = BIT(1),
-};
-
 /* tt data subtypes */
 #define BATADV_TT_DATA_TYPE_MASK 0x0F
 
@@ -255,16 +249,6 @@ struct batadv_unicast_4addr_packet {
 	 */
 };
 
-struct batadv_unicast_frag_packet {
-	struct batadv_header header;
-	uint8_t  ttvn; /* destination translation table version number */
-	uint8_t  dest[ETH_ALEN];
-	uint8_t  flags;
-	uint8_t  align;
-	uint8_t  orig[ETH_ALEN];
-	__be16   seqno;
-} __packed;
-
 struct batadv_bcast_packet {
 	struct batadv_header header;
 	uint8_t  reserved;
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 0dc1c0e..fd2cdbc 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -25,7 +25,6 @@
 #include "icmp_socket.h"
 #include "translation-table.h"
 #include "originator.h"
-#include "unicast.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
 #include "network-coding.h"
@@ -653,11 +652,9 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 {
 	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 	struct batadv_orig_node *orig_node = NULL;
-	struct batadv_neigh_node *neigh_node = NULL;
 	struct batadv_unicast_packet *unicast_packet;
 	struct ethhdr *ethhdr = eth_hdr(skb);
 	int res, hdr_len, ret = NET_RX_DROP;
-	struct sk_buff *new_skb;
 
 	unicast_packet = (struct batadv_unicast_packet *)skb->data;
 
@@ -674,46 +671,12 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 	if (!orig_node)
 		goto out;
 
-	/* find_router() increases neigh_nodes refcount if found. */
-	neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
-
-	if (!neigh_node)
-		goto out;
-
 	/* create a copy of the skb, if needed, to modify it. */
 	if (skb_cow(skb, ETH_HLEN) < 0)
 		goto out;
 
-	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-
-	if (unicast_packet->header.packet_type == BATADV_UNICAST &&
-	    atomic_read(&bat_priv->fragmentation) &&
-	    skb->len > neigh_node->if_incoming->net_dev->mtu) {
-		ret = batadv_frag_send_skb(skb, bat_priv,
-					   neigh_node->if_incoming,
-					   neigh_node->addr);
-		goto out;
-	}
-
-	if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG &&
-	    batadv_frag_can_reassemble(skb,
-				       neigh_node->if_incoming->net_dev->mtu)) {
-		ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
-
-		if (ret == NET_RX_DROP)
-			goto out;
-
-		/* packet was buffered for late merge */
-		if (!new_skb) {
-			ret = NET_RX_SUCCESS;
-			goto out;
-		}
-
-		skb = new_skb;
-		unicast_packet = (struct batadv_unicast_packet *)skb->data;
-	}
-
 	/* decrement ttl */
+	unicast_packet = (struct batadv_unicast_packet *)skb->data;
 	unicast_packet->header.ttl--;
 
 	switch (unicast_packet->header.packet_type) {
@@ -748,8 +711,6 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 	}
 
 out:
-	if (neigh_node)
-		batadv_neigh_node_free_ref(neigh_node);
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
 	return ret;
@@ -1003,51 +964,6 @@ rx_success:
 	return batadv_route_unicast_packet(skb, recv_if);
 }
 
-int batadv_recv_ucast_frag_packet(struct sk_buff *skb,
-				  struct batadv_hard_iface *recv_if)
-{
-	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
-	struct batadv_unicast_frag_packet *unicast_packet;
-	int hdr_size = sizeof(*unicast_packet);
-	struct sk_buff *new_skb = NULL;
-	int ret;
-
-	if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
-		return NET_RX_DROP;
-
-	if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
-		return NET_RX_DROP;
-
-	unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
-
-	/* packet for me */
-	if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
-		ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
-
-		if (ret == NET_RX_DROP)
-			return NET_RX_DROP;
-
-		/* packet was buffered for late merge */
-		if (!new_skb)
-			return NET_RX_SUCCESS;
-
-		if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb,
-							  hdr_size))
-			goto rx_success;
-		if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb,
-							hdr_size))
-			goto rx_success;
-
-		batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if,
-				    sizeof(struct batadv_unicast_packet), NULL);
-
-rx_success:
-		return NET_RX_SUCCESS;
-	}
-
-	return batadv_route_unicast_packet(skb, recv_if);
-}
-
 /**
  * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
  * @skb: unicast tvlv packet to process
diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h
index ea15fa6..efab583 100644
--- a/net/batman-adv/routing.h
+++ b/net/batman-adv/routing.h
@@ -30,8 +30,6 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 			    struct batadv_hard_iface *recv_if);
 int batadv_recv_unicast_packet(struct sk_buff *skb,
 			       struct batadv_hard_iface *recv_if);
-int batadv_recv_ucast_frag_packet(struct sk_buff *skb,
-				  struct batadv_hard_iface *recv_if);
 int batadv_recv_bcast_packet(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if);
 int batadv_recv_tt_query(struct sk_buff *skb,
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 81d69fb..b8356ec 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -25,6 +25,7 @@
 #include "soft-interface.h"
 #include "hard-interface.h"
 #include "gateway_common.h"
+#include "gateway_client.h"
 #include "originator.h"
 #include "network-coding.h"
 
@@ -127,6 +128,179 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 	return ret;
 }
 
+/**
+ * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
+ *  common fields for unicast packets
+ * @skb: the skb carrying the unicast header to initialize
+ * @hdr_size: amount of bytes to push at the beginning of the skb
+ * @orig_node: the destination node
+ *
+ * Returns false if the buffer extension was not possible or true otherwise.
+ */
+static bool
+batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
+				  struct batadv_orig_node *orig_node)
+{
+	struct batadv_unicast_packet *unicast_packet;
+	uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
+
+	if (batadv_skb_head_push(skb, hdr_size) < 0)
+		return false;
+
+	unicast_packet = (struct batadv_unicast_packet *)skb->data;
+	unicast_packet->header.version = BATADV_COMPAT_VERSION;
+	/* batman packet type: unicast */
+	unicast_packet->header.packet_type = BATADV_UNICAST;
+	/* set unicast ttl */
+	unicast_packet->header.ttl = BATADV_TTL;
+	/* copy the destination for faster routing */
+	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
+	/* set the destination tt version number */
+	unicast_packet->ttvn = ttvn;
+
+	return true;
+}
+
+/**
+ * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
+ * @skb: the skb containing the payload to encapsulate
+ * @orig_node: the destination node
+ *
+ * Returns false if the payload could not be encapsulated or true otherwise.
+ */
+static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
+					    struct batadv_orig_node *orig_node)
+{
+	size_t uni_size = sizeof(struct batadv_unicast_packet);
+
+	return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
+}
+
+/**
+ * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
+ *  unicast 4addr header
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the skb containing the payload to encapsulate
+ * @orig_node: the destination node
+ * @packet_subtype: the unicast 4addr packet subtype to use
+ *
+ * Returns false if the payload could not be encapsulated or true otherwise.
+ */
+bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
+					   struct sk_buff *skb,
+					   struct batadv_orig_node *orig,
+					   int packet_subtype)
+{
+	struct batadv_hard_iface *primary_if;
+	struct batadv_unicast_4addr_packet *uc_4addr_packet;
+	bool ret = false;
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (!primary_if)
+		goto out;
+
+	/* Pull the header space and fill the unicast_packet substructure.
+	 * We can do that because the first member of the uc_4addr_packet
+	 * is of type struct unicast_packet
+	 */
+	if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
+					       orig))
+		goto out;
+
+	uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
+	uc_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR;
+	memcpy(uc_4addr_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
+	uc_4addr_packet->subtype = packet_subtype;
+	uc_4addr_packet->reserved = 0;
+
+	ret = true;
+out:
+	if (primary_if)
+		batadv_hardif_free_ref(primary_if);
+	return ret;
+}
+
+/**
+ * batadv_send_generic_unicast_skb - send an skb as unicast
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: payload to send
+ * @packet_type: the batman unicast packet type to use
+ * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
+ *  4addr packets)
+ *
+ * Returns 1 in case of error or 0 otherwise.
+ */
+int batadv_send_skb_generic_unicast(struct batadv_priv *bat_priv,
+				    struct sk_buff *skb, int packet_type,
+				    int packet_subtype)
+{
+	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+	struct batadv_unicast_packet *unicast_packet;
+	struct batadv_orig_node *orig_node;
+	struct batadv_neigh_node *neigh_node;
+	int ret = NET_RX_DROP;
+
+	/* get routing information */
+	if (is_multicast_ether_addr(ethhdr->h_dest)) {
+		orig_node = batadv_gw_get_selected_orig(bat_priv);
+		if (orig_node)
+			goto find_router;
+	}
+
+	/* check for tt host - increases orig_node refcount.
+	 * returns NULL in case of AP isolation
+	 */
+	orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
+					     ethhdr->h_dest);
+
+find_router:
+	/* find_router():
+	 *  - if orig_node is NULL it returns NULL
+	 *  - increases neigh_nodes refcount if found.
+	 */
+	neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
+
+	if (!neigh_node)
+		goto out;
+
+	switch (packet_type) {
+	case BATADV_UNICAST:
+		batadv_send_skb_prepare_unicast(skb, orig_node);
+		break;
+	case BATADV_UNICAST_4ADDR:
+		batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, orig_node,
+						      packet_subtype);
+		break;
+	default:
+		/* this function supports UNICAST and UNICAST_4ADDR only. It
+		 * should never be invoked with any other packet type
+		 */
+		goto out;
+	}
+
+	unicast_packet = (struct batadv_unicast_packet *)skb->data;
+
+	/* inform the destination node that we are still missing a correct route
+	 * for this client. The destination will receive this packet and will
+	 * try to reroute it because the ttvn contained in the header is less
+	 * than the current one
+	 */
+	if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
+		unicast_packet->ttvn = unicast_packet->ttvn - 1;
+
+	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
+		ret = 0;
+
+out:
+	if (neigh_node)
+		batadv_neigh_node_free_ref(neigh_node);
+	if (orig_node)
+		batadv_orig_node_free_ref(orig_node);
+	if (ret == NET_RX_DROP)
+		kfree_skb(skb);
+	return ret;
+}
+
 void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
 {
 	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
diff --git a/net/batman-adv/send.h b/net/batman-adv/send.h
index e7b1788..ad63184 100644
--- a/net/batman-adv/send.h
+++ b/net/batman-adv/send.h
@@ -34,5 +34,45 @@ void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work);
 void
 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
 				 const struct batadv_hard_iface *hard_iface);
+bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
+					   struct sk_buff *skb,
+					   struct batadv_orig_node *orig_node,
+					   int packet_subtype);
+int batadv_send_skb_generic_unicast(struct batadv_priv *bat_priv,
+				    struct sk_buff *skb, int packet_type,
+				    int packet_subtype);
+
+
+/**
+ * batadv_send_unicast_skb - send the skb encapsulated in a unicast packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the payload to send
+ *
+ * Returns 1 in case of error or 0 otherwise.
+ */
+static inline int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
+					  struct sk_buff *skb)
+{
+	return batadv_send_skb_generic_unicast(bat_priv, skb, BATADV_UNICAST,
+					       0);
+}
+
+/**
+ * batadv_send_4addr_unicast_skb - send the skb encapsulated in a unicast 4addr
+ *  packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the payload to send
+ * @packet_subtype: the unicast 4addr packet subtype to use
+ *
+ * Returns 1 in case of error or 0 otherwise.
+ */
+static inline int batadv_send_skb_unicast_4addr(struct batadv_priv *bat_priv,
+						struct sk_buff *skb,
+						int packet_subtype)
+{
+	return batadv_send_skb_generic_unicast(bat_priv, skb,
+					       BATADV_UNICAST_4ADDR,
+					       packet_subtype);
+}
 
 #endif /* _NET_BATMAN_ADV_SEND_H_ */
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 25e6004..504d0bb 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -34,8 +34,6 @@
 #include <linux/ethtool.h>
 #include <linux/etherdevice.h>
 #include <linux/if_vlan.h>
-#include <linux/if_ether.h>
-#include "unicast.h"
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
 
@@ -286,7 +284,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
 
 		batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 
-		ret = batadv_unicast_send_skb(bat_priv, skb);
+		ret = batadv_send_skb_unicast(bat_priv, skb);
 		if (ret != 0)
 			goto dropped_freed;
 	}
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 8fbd89d..795a079 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -60,7 +60,6 @@ struct batadv_hard_iface_bat_iv {
  * @if_num: identificator of the interface
  * @if_status: status of the interface for batman-adv
  * @net_dev: pointer to the net_device
- * @frag_seqno: last fragment sequence number sent by this interface
  * @num_bcasts: number of payload re-broadcasts on this interface (ARQ)
  * @hardif_obj: kobject of the per interface sysfs "mesh" directory
  * @refcount: number of contexts the object is used
@@ -76,7 +75,6 @@ struct batadv_hard_iface {
 	int16_t if_num;
 	char if_status;
 	struct net_device *net_dev;
-	atomic_t frag_seqno;
 	uint8_t num_bcasts;
 	struct kobject *hardif_obj;
 	atomic_t refcount;
@@ -116,9 +114,6 @@ struct batadv_hard_iface {
  *  last_bcast_seqno)
  * @last_bcast_seqno: last broadcast sequence number received by this host
  * @neigh_list: list of potential next hop neighbor towards this orig node
- * @frag_list: fragmentation buffer list for fragment re-assembly
- * @last_frag_packet: time when last fragmented packet from this node was
- *  received
  * @neigh_list_lock: lock protecting neigh_list, router and bonding_list
  * @hash_entry: hlist node for batadv_priv::orig_hash
  * @bat_priv: pointer to soft_iface this orig node belongs to
@@ -159,8 +154,6 @@ struct batadv_orig_node {
 	DECLARE_BITMAP(bcast_bits, BATADV_TQ_LOCAL_WINDOW_SIZE);
 	uint32_t last_bcast_seqno;
 	struct hlist_head neigh_list;
-	struct list_head frag_list;
-	unsigned long last_frag_packet;
 	/* neigh_list_lock protects: neigh_list, router & bonding_list */
 	spinlock_t neigh_list_lock;
 	struct hlist_node hash_entry;
@@ -874,18 +867,6 @@ struct batadv_forw_packet {
 };
 
 /**
- * struct batadv_frag_packet_list_entry - storage for fragment packet
- * @list: list node for orig_node::frag_list
- * @seqno: sequence number of the fragment
- * @skb: fragment's skb buffer
- */
-struct batadv_frag_packet_list_entry {
-	struct list_head list;
-	uint16_t seqno;
-	struct sk_buff *skb;
-};
-
-/**
  * struct batadv_algo_ops - mesh algorithm callbacks
  * @list: list node for the batadv_algo_list
  * @name: name of the algorithm
diff --git a/net/batman-adv/unicast.c b/net/batman-adv/unicast.c
deleted file mode 100644
index 48b31d3..0000000
--- a/net/batman-adv/unicast.c
+++ /dev/null
@@ -1,491 +0,0 @@
-/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
- *
- * Andreas Langer
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
- */
-
-#include "main.h"
-#include "unicast.h"
-#include "send.h"
-#include "soft-interface.h"
-#include "gateway_client.h"
-#include "originator.h"
-#include "hash.h"
-#include "translation-table.h"
-#include "routing.h"
-#include "hard-interface.h"
-
-
-static struct sk_buff *
-batadv_frag_merge_packet(struct list_head *head,
-			 struct batadv_frag_packet_list_entry *tfp,
-			 struct sk_buff *skb)
-{
-	struct batadv_unicast_frag_packet *up;
-	struct sk_buff *tmp_skb;
-	struct batadv_unicast_packet *unicast_packet;
-	int hdr_len = sizeof(*unicast_packet);
-	int uni_diff = sizeof(*up) - hdr_len;
-	uint8_t *packet_pos;
-
-	up = (struct batadv_unicast_frag_packet *)skb->data;
-	/* set skb to the first part and tmp_skb to the second part */
-	if (up->flags & BATADV_UNI_FRAG_HEAD) {
-		tmp_skb = tfp->skb;
-	} else {
-		tmp_skb = skb;
-		skb = tfp->skb;
-	}
-
-	if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0)
-		goto err;
-
-	skb_pull(tmp_skb, sizeof(*up));
-	if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0)
-		goto err;
-
-	/* move free entry to end */
-	tfp->skb = NULL;
-	tfp->seqno = 0;
-	list_move_tail(&tfp->list, head);
-
-	memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
-	kfree_skb(tmp_skb);
-
-	memmove(skb->data + uni_diff, skb->data, hdr_len);
-	packet_pos = skb_pull(skb, uni_diff);
-	unicast_packet = (struct batadv_unicast_packet *)packet_pos;
-	unicast_packet->header.packet_type = BATADV_UNICAST;
-
-	return skb;
-
-err:
-	/* free buffered skb, skb will be freed later */
-	kfree_skb(tfp->skb);
-	return NULL;
-}
-
-static void batadv_frag_create_entry(struct list_head *head,
-				     struct sk_buff *skb)
-{
-	struct batadv_frag_packet_list_entry *tfp;
-	struct batadv_unicast_frag_packet *up;
-
-	up = (struct batadv_unicast_frag_packet *)skb->data;
-
-	/* free and oldest packets stand at the end */
-	tfp = list_entry((head)->prev, typeof(*tfp), list);
-	kfree_skb(tfp->skb);
-
-	tfp->seqno = ntohs(up->seqno);
-	tfp->skb = skb;
-	list_move(&tfp->list, head);
-	return;
-}
-
-static int batadv_frag_create_buffer(struct list_head *head)
-{
-	int i;
-	struct batadv_frag_packet_list_entry *tfp;
-
-	for (i = 0; i < BATADV_FRAG_BUFFER_SIZE; i++) {
-		tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC);
-		if (!tfp) {
-			batadv_frag_list_free(head);
-			return -ENOMEM;
-		}
-		tfp->skb = NULL;
-		tfp->seqno = 0;
-		INIT_LIST_HEAD(&tfp->list);
-		list_add(&tfp->list, head);
-	}
-
-	return 0;
-}
-
-static struct batadv_frag_packet_list_entry *
-batadv_frag_search_packet(struct list_head *head,
-			  const struct batadv_unicast_frag_packet *up)
-{
-	struct batadv_frag_packet_list_entry *tfp;
-	struct batadv_unicast_frag_packet *tmp_up = NULL;
-	bool is_head_tmp, is_head;
-	uint16_t search_seqno;
-
-	if (up->flags & BATADV_UNI_FRAG_HEAD)
-		search_seqno = ntohs(up->seqno)+1;
-	else
-		search_seqno = ntohs(up->seqno)-1;
-
-	is_head = up->flags & BATADV_UNI_FRAG_HEAD;
-
-	list_for_each_entry(tfp, head, list) {
-		if (!tfp->skb)
-			continue;
-
-		if (tfp->seqno == ntohs(up->seqno))
-			goto mov_tail;
-
-		tmp_up = (struct batadv_unicast_frag_packet *)tfp->skb->data;
-
-		if (tfp->seqno == search_seqno) {
-			is_head_tmp = tmp_up->flags & BATADV_UNI_FRAG_HEAD;
-			if (is_head_tmp != is_head)
-				return tfp;
-			else
-				goto mov_tail;
-		}
-	}
-	return NULL;
-
-mov_tail:
-	list_move_tail(&tfp->list, head);
-	return NULL;
-}
-
-void batadv_frag_list_free(struct list_head *head)
-{
-	struct batadv_frag_packet_list_entry *pf, *tmp_pf;
-
-	if (!list_empty(head)) {
-		list_for_each_entry_safe(pf, tmp_pf, head, list) {
-			kfree_skb(pf->skb);
-			list_del(&pf->list);
-			kfree(pf);
-		}
-	}
-	return;
-}
-
-/* frag_reassemble_skb():
- * returns NET_RX_DROP if the operation failed - skb is left intact
- * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL)
- * or the skb could be reassembled (skb_new will point to the new packet and
- * skb was freed)
- */
-int batadv_frag_reassemble_skb(struct sk_buff *skb,
-			       struct batadv_priv *bat_priv,
-			       struct sk_buff **new_skb)
-{
-	struct batadv_orig_node *orig_node;
-	struct batadv_frag_packet_list_entry *tmp_frag_entry;
-	int ret = NET_RX_DROP;
-	struct batadv_unicast_frag_packet *unicast_packet;
-
-	unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
-	*new_skb = NULL;
-
-	orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->orig);
-	if (!orig_node)
-		goto out;
-
-	orig_node->last_frag_packet = jiffies;
-
-	if (list_empty(&orig_node->frag_list) &&
-	    batadv_frag_create_buffer(&orig_node->frag_list)) {
-		pr_debug("couldn't create frag buffer\n");
-		goto out;
-	}
-
-	tmp_frag_entry = batadv_frag_search_packet(&orig_node->frag_list,
-						   unicast_packet);
-
-	if (!tmp_frag_entry) {
-		batadv_frag_create_entry(&orig_node->frag_list, skb);
-		ret = NET_RX_SUCCESS;
-		goto out;
-	}
-
-	*new_skb = batadv_frag_merge_packet(&orig_node->frag_list,
-					    tmp_frag_entry, skb);
-	/* if not, merge failed */
-	if (*new_skb)
-		ret = NET_RX_SUCCESS;
-
-out:
-	if (orig_node)
-		batadv_orig_node_free_ref(orig_node);
-	return ret;
-}
-
-int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
-			 struct batadv_hard_iface *hard_iface,
-			 const uint8_t dstaddr[])
-{
-	struct batadv_unicast_packet tmp_uc, *unicast_packet;
-	struct batadv_hard_iface *primary_if;
-	struct sk_buff *frag_skb;
-	struct batadv_unicast_frag_packet *frag1, *frag2;
-	int uc_hdr_len = sizeof(*unicast_packet);
-	int ucf_hdr_len = sizeof(*frag1);
-	int data_len = skb->len - uc_hdr_len;
-	int large_tail = 0, ret = NET_RX_DROP;
-	uint16_t seqno;
-
-	primary_if = batadv_primary_if_get_selected(bat_priv);
-	if (!primary_if)
-		goto dropped;
-
-	frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
-	if (!frag_skb)
-		goto dropped;
-
-	skb->priority = TC_PRIO_CONTROL;
-	skb_reserve(frag_skb, ucf_hdr_len);
-
-	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-	memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
-	skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len);
-
-	if (batadv_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 ||
-	    batadv_skb_head_push(frag_skb, ucf_hdr_len) < 0)
-		goto drop_frag;
-
-	frag1 = (struct batadv_unicast_frag_packet *)skb->data;
-	frag2 = (struct batadv_unicast_frag_packet *)frag_skb->data;
-
-	memcpy(frag1, &tmp_uc, sizeof(tmp_uc));
-
-	frag1->header.ttl--;
-	frag1->header.version = BATADV_COMPAT_VERSION;
-	frag1->header.packet_type = BATADV_UNICAST_FRAG;
-
-	memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
-	memcpy(frag2, frag1, sizeof(*frag2));
-
-	if (data_len & 1)
-		large_tail = BATADV_UNI_FRAG_LARGETAIL;
-
-	frag1->flags = BATADV_UNI_FRAG_HEAD | large_tail;
-	frag2->flags = large_tail;
-
-	seqno = atomic_add_return(2, &hard_iface->frag_seqno);
-	frag1->seqno = htons(seqno - 1);
-	frag2->seqno = htons(seqno);
-
-	batadv_send_skb_packet(skb, hard_iface, dstaddr);
-	batadv_send_skb_packet(frag_skb, hard_iface, dstaddr);
-	ret = NET_RX_SUCCESS;
-	goto out;
-
-drop_frag:
-	kfree_skb(frag_skb);
-dropped:
-	kfree_skb(skb);
-out:
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
-	return ret;
-}
-
-/**
- * batadv_unicast_push_and_fill_skb - extends the buffer and initializes the
- * common fields for unicast packets
- * @skb: packet
- * @hdr_size: amount of bytes to push at the beginning of the skb
- * @orig_node: the destination node
- *
- * Returns false if the buffer extension was not possible or true otherwise
- */
-static bool batadv_unicast_push_and_fill_skb(struct sk_buff *skb, int hdr_size,
-					     struct batadv_orig_node *orig_node)
-{
-	struct batadv_unicast_packet *unicast_packet;
-	uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
-
-	if (batadv_skb_head_push(skb, hdr_size) < 0)
-		return false;
-
-	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-	unicast_packet->header.version = BATADV_COMPAT_VERSION;
-	/* batman packet type: unicast */
-	unicast_packet->header.packet_type = BATADV_UNICAST;
-	/* set unicast ttl */
-	unicast_packet->header.ttl = BATADV_TTL;
-	/* copy the destination for faster routing */
-	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
-	/* set the destination tt version number */
-	unicast_packet->ttvn = ttvn;
-
-	return true;
-}
-
-/**
- * batadv_unicast_prepare_skb - encapsulate an skb with a unicast header
- * @skb: the skb containing the payload to encapsulate
- * @orig_node: the destination node
- *
- * Returns false if the payload could not be encapsulated or true otherwise.
- *
- * This call might reallocate skb data.
- */
-static bool batadv_unicast_prepare_skb(struct sk_buff *skb,
-				       struct batadv_orig_node *orig_node)
-{
-	size_t uni_size = sizeof(struct batadv_unicast_packet);
-	return batadv_unicast_push_and_fill_skb(skb, uni_size, orig_node);
-}
-
-/**
- * batadv_unicast_4addr_prepare_skb - encapsulate an skb with a unicast4addr
- * header
- * @bat_priv: the bat priv with all the soft interface information
- * @skb: the skb containing the payload to encapsulate
- * @orig_node: the destination node
- * @packet_subtype: the batman 4addr packet subtype to use
- *
- * Returns false if the payload could not be encapsulated or true otherwise.
- *
- * This call might reallocate skb data.
- */
-bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
-				      struct sk_buff *skb,
-				      struct batadv_orig_node *orig,
-				      int packet_subtype)
-{
-	struct batadv_hard_iface *primary_if;
-	struct batadv_unicast_4addr_packet *unicast_4addr_packet;
-	bool ret = false;
-
-	primary_if = batadv_primary_if_get_selected(bat_priv);
-	if (!primary_if)
-		goto out;
-
-	/* pull the header space and fill the unicast_packet substructure.
-	 * We can do that because the first member of the unicast_4addr_packet
-	 * is of type struct unicast_packet
-	 */
-	if (!batadv_unicast_push_and_fill_skb(skb,
-					      sizeof(*unicast_4addr_packet),
-					      orig))
-		goto out;
-
-	unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
-	unicast_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR;
-	memcpy(unicast_4addr_packet->src, primary_if->net_dev->dev_addr,
-	       ETH_ALEN);
-	unicast_4addr_packet->subtype = packet_subtype;
-	unicast_4addr_packet->reserved = 0;
-
-	ret = true;
-out:
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
-	return ret;
-}
-
-/**
- * batadv_unicast_generic_send_skb - send an skb as unicast
- * @bat_priv: the bat priv with all the soft interface information
- * @skb: payload to send
- * @packet_type: the batman unicast packet type to use
- * @packet_subtype: the batman packet subtype. It is ignored if packet_type is
- *		    not BATADV_UNICAT_4ADDR
- *
- * Returns 1 in case of error or 0 otherwise
- */
-int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
-				    struct sk_buff *skb, int packet_type,
-				    int packet_subtype)
-{
-	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
-	struct batadv_unicast_packet *unicast_packet;
-	struct batadv_orig_node *orig_node;
-	struct batadv_neigh_node *neigh_node;
-	int data_len = skb->len;
-	int ret = NET_RX_DROP;
-	unsigned int dev_mtu, header_len;
-
-	/* get routing information */
-	if (is_multicast_ether_addr(ethhdr->h_dest)) {
-		orig_node = batadv_gw_get_selected_orig(bat_priv);
-		if (orig_node)
-			goto find_router;
-	}
-
-	/* check for tt host - increases orig_node refcount.
-	 * returns NULL in case of AP isolation
-	 */
-	orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
-					     ethhdr->h_dest);
-
-find_router:
-	/* find_router():
-	 *  - if orig_node is NULL it returns NULL
-	 *  - increases neigh_nodes refcount if found.
-	 */
-	neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
-
-	if (!neigh_node)
-		goto out;
-
-	switch (packet_type) {
-	case BATADV_UNICAST:
-		if (!batadv_unicast_prepare_skb(skb, orig_node))
-			goto out;
-
-		header_len = sizeof(struct batadv_unicast_packet);
-		break;
-	case BATADV_UNICAST_4ADDR:
-		if (!batadv_unicast_4addr_prepare_skb(bat_priv, skb, orig_node,
-						      packet_subtype))
-			goto out;
-
-		header_len = sizeof(struct batadv_unicast_4addr_packet);
-		break;
-	default:
-		/* this function supports UNICAST and UNICAST_4ADDR only. It
-		 * should never be invoked with any other packet type
-		 */
-		goto out;
-	}
-
-	ethhdr = (struct ethhdr *)(skb->data + header_len);
-	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-
-	/* inform the destination node that we are still missing a correct route
-	 * for this client. The destination will receive this packet and will
-	 * try to reroute it because the ttvn contained in the header is less
-	 * than the current one
-	 */
-	if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
-		unicast_packet->ttvn = unicast_packet->ttvn - 1;
-
-	dev_mtu = neigh_node->if_incoming->net_dev->mtu;
-	/* fragmentation mechanism only works for UNICAST (now) */
-	if (packet_type == BATADV_UNICAST &&
-	    atomic_read(&bat_priv->fragmentation) &&
-	    data_len + sizeof(*unicast_packet) > dev_mtu) {
-		/* send frag skb decreases ttl */
-		unicast_packet->header.ttl++;
-		ret = batadv_frag_send_skb(skb, bat_priv,
-					   neigh_node->if_incoming,
-					   neigh_node->addr);
-		goto out;
-	}
-
-	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
-		ret = 0;
-
-out:
-	if (neigh_node)
-		batadv_neigh_node_free_ref(neigh_node);
-	if (orig_node)
-		batadv_orig_node_free_ref(orig_node);
-	if (ret == NET_RX_DROP)
-		kfree_skb(skb);
-	return ret;
-}
diff --git a/net/batman-adv/unicast.h b/net/batman-adv/unicast.h
deleted file mode 100644
index 429cf8a..0000000
--- a/net/batman-adv/unicast.h
+++ /dev/null
@@ -1,92 +0,0 @@
-/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
- *
- * Andreas Langer
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
- */
-
-#ifndef _NET_BATMAN_ADV_UNICAST_H_
-#define _NET_BATMAN_ADV_UNICAST_H_
-
-#include "packet.h"
-
-#define BATADV_FRAG_TIMEOUT 10000 /* purge frag list entries after time in ms */
-#define BATADV_FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */
-
-int batadv_frag_reassemble_skb(struct sk_buff *skb,
-			       struct batadv_priv *bat_priv,
-			       struct sk_buff **new_skb);
-void batadv_frag_list_free(struct list_head *head);
-int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
-			 struct batadv_hard_iface *hard_iface,
-			 const uint8_t dstaddr[]);
-bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
-				      struct sk_buff *skb,
-				      struct batadv_orig_node *orig_node,
-				      int packet_subtype);
-int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
-				    struct sk_buff *skb, int packet_type,
-				    int packet_subtype);
-
-
-/**
- * batadv_unicast_send_skb - send the skb encapsulated in a unicast packet
- * @bat_priv: the bat priv with all the soft interface information
- * @skb: the payload to send
- */
-static inline int batadv_unicast_send_skb(struct batadv_priv *bat_priv,
-					  struct sk_buff *skb)
-{
-	return batadv_unicast_generic_send_skb(bat_priv, skb, BATADV_UNICAST,
-					       0);
-}
-
-/**
- * batadv_unicast_send_skb - send the skb encapsulated in a unicast4addr packet
- * @bat_priv: the bat priv with all the soft interface information
- * @skb: the payload to send
- * @packet_subtype: the batman 4addr packet subtype to use
- */
-static inline int batadv_unicast_4addr_send_skb(struct batadv_priv *bat_priv,
-						struct sk_buff *skb,
-						int packet_subtype)
-{
-	return batadv_unicast_generic_send_skb(bat_priv, skb,
-					       BATADV_UNICAST_4ADDR,
-					       packet_subtype);
-}
-
-static inline int batadv_frag_can_reassemble(const struct sk_buff *skb, int mtu)
-{
-	const struct batadv_unicast_frag_packet *unicast_packet;
-	int uneven_correction = 0;
-	unsigned int merged_size;
-
-	unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
-
-	if (unicast_packet->flags & BATADV_UNI_FRAG_LARGETAIL) {
-		if (unicast_packet->flags & BATADV_UNI_FRAG_HEAD)
-			uneven_correction = 1;
-		else
-			uneven_correction = -1;
-	}
-
-	merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
-	merged_size += sizeof(struct batadv_unicast_packet) + uneven_correction;
-
-	return merged_size <= mtu;
-}
-
-#endif /* _NET_BATMAN_ADV_UNICAST_H_ */
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 07/16] batman-adv: Remove old fragmentation code
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, Martin Hundebøll, b.a.t.m.a.n, Marek Lindner,
	Antonio Quartulli

From: Martin Hundebøll <martin@hundeboll.net>

Remove the existing fragmentation code before adding the new version
and delete unicast.{h,c}.

batadv_unicast_send_skb() is moved to send.c and renamed to
batadv_send_skb_unicast().

fragmentation entry in sysfs (bat_priv->fragmentation) is kept for use in
the new fragmentation code.

BATADV_UNICAST_FRAG packet type is renamed to BATADV_FRAG for use in the
new fragmentation code.

Signed-off-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/Makefile                |   1 -
 net/batman-adv/distributed-arp-table.c |  11 +-
 net/batman-adv/hard-interface.c        |   1 -
 net/batman-adv/main.c                  |   4 -
 net/batman-adv/originator.c            |   9 -
 net/batman-adv/packet.h                |  16 --
 net/batman-adv/routing.c               |  86 +-----
 net/batman-adv/routing.h               |   2 -
 net/batman-adv/send.c                  | 174 ++++++++++++
 net/batman-adv/send.h                  |  40 +++
 net/batman-adv/soft-interface.c        |   4 +-
 net/batman-adv/types.h                 |  19 --
 net/batman-adv/unicast.c               | 491 ---------------------------------
 net/batman-adv/unicast.h               |  92 ------
 14 files changed, 221 insertions(+), 729 deletions(-)
 delete mode 100644 net/batman-adv/unicast.c
 delete mode 100644 net/batman-adv/unicast.h

diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile
index 8ddbfe6..f9b465b 100644
--- a/net/batman-adv/Makefile
+++ b/net/batman-adv/Makefile
@@ -37,4 +37,3 @@ batman-adv-y += send.o
 batman-adv-y += soft-interface.o
 batman-adv-y += sysfs.o
 batman-adv-y += translation-table.o
-batman-adv-y += unicast.o
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index f07ec32..99da412 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -29,7 +29,6 @@
 #include "send.h"
 #include "types.h"
 #include "translation-table.h"
-#include "unicast.h"
 
 static void batadv_dat_purge(struct work_struct *work);
 
@@ -592,9 +591,9 @@ static bool batadv_dat_send_data(struct batadv_priv *bat_priv,
 			goto free_orig;
 
 		tmp_skb = pskb_copy(skb, GFP_ATOMIC);
-		if (!batadv_unicast_4addr_prepare_skb(bat_priv, tmp_skb,
-						      cand[i].orig_node,
-						      packet_subtype)) {
+		if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb,
+							   cand[i].orig_node,
+							   packet_subtype)) {
 			kfree_skb(tmp_skb);
 			goto free_neigh;
 		}
@@ -990,10 +989,10 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
 	 * that a node not using the 4addr packet format doesn't support it.
 	 */
 	if (hdr_size == sizeof(struct batadv_unicast_4addr_packet))
-		err = batadv_unicast_4addr_send_skb(bat_priv, skb_new,
+		err = batadv_send_skb_unicast_4addr(bat_priv, skb_new,
 						    BATADV_P_DAT_CACHE_REPLY);
 	else
-		err = batadv_unicast_send_skb(bat_priv, skb_new);
+		err = batadv_send_skb_unicast(bat_priv, skb_new);
 
 	if (!err) {
 		batadv_inc_counter(bat_priv, BATADV_CNT_DAT_CACHED_REPLY_TX);
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index eeb6671..0c8602e 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -444,7 +444,6 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
 	dev_add_pack(&hard_iface->batman_adv_ptype);
 
-	atomic_set(&hard_iface->frag_seqno, 1);
 	batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
 		    hard_iface->net_dev->name);
 
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 8b195e6..8822fad 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -36,7 +36,6 @@
 #include "gateway_client.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
-#include "unicast.h"
 #include "gateway_common.h"
 #include "hash.h"
 #include "bat_algo.h"
@@ -399,7 +398,6 @@ static void batadv_recv_handler_init(void)
 	/* compile time checks for struct member offsets */
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4);
-	BUILD_BUG_ON(offsetof(struct batadv_unicast_frag_packet, dest) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4);
@@ -412,8 +410,6 @@ static void batadv_recv_handler_init(void)
 	batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet;
 	/* unicast packet */
 	batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
-	/* fragmented unicast packet */
-	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
 	/* unicast tvlv packet */
 	batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
 	/* batman icmp packet */
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 5d53d2f..898b0ce 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -25,7 +25,6 @@
 #include "routing.h"
 #include "gateway_client.h"
 #include "hard-interface.h"
-#include "unicast.h"
 #include "soft-interface.h"
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
@@ -146,7 +145,6 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 	/* Free nc_nodes */
 	batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 
-	batadv_frag_list_free(&orig_node->frag_list);
 	batadv_tt_global_del_orig(orig_node->bat_priv, orig_node,
 				  "originator timed out");
 
@@ -269,9 +267,6 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 	size = bat_priv->num_ifaces * sizeof(uint8_t);
 	orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 
-	INIT_LIST_HEAD(&orig_node->frag_list);
-	orig_node->last_frag_packet = 0;
-
 	if (!orig_node->bcast_own_sum)
 		goto free_bcast_own;
 
@@ -393,10 +388,6 @@ static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 				batadv_orig_node_free_ref(orig_node);
 				continue;
 			}
-
-			if (batadv_has_timed_out(orig_node->last_frag_packet,
-						 BATADV_FRAG_TIMEOUT))
-				batadv_frag_list_free(&orig_node->frag_list);
 		}
 		spin_unlock_bh(list_lock);
 	}
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index 4361bae..5e3b102 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -91,12 +91,6 @@ enum batadv_icmp_packettype {
 	BATADV_PARAMETER_PROBLEM       = 12,
 };
 
-/* fragmentation defines */
-enum batadv_unicast_frag_flags {
-	BATADV_UNI_FRAG_HEAD	  = BIT(0),
-	BATADV_UNI_FRAG_LARGETAIL = BIT(1),
-};
-
 /* tt data subtypes */
 #define BATADV_TT_DATA_TYPE_MASK 0x0F
 
@@ -255,16 +249,6 @@ struct batadv_unicast_4addr_packet {
 	 */
 };
 
-struct batadv_unicast_frag_packet {
-	struct batadv_header header;
-	uint8_t  ttvn; /* destination translation table version number */
-	uint8_t  dest[ETH_ALEN];
-	uint8_t  flags;
-	uint8_t  align;
-	uint8_t  orig[ETH_ALEN];
-	__be16   seqno;
-} __packed;
-
 struct batadv_bcast_packet {
 	struct batadv_header header;
 	uint8_t  reserved;
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 0dc1c0e..fd2cdbc 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -25,7 +25,6 @@
 #include "icmp_socket.h"
 #include "translation-table.h"
 #include "originator.h"
-#include "unicast.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
 #include "network-coding.h"
@@ -653,11 +652,9 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 {
 	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 	struct batadv_orig_node *orig_node = NULL;
-	struct batadv_neigh_node *neigh_node = NULL;
 	struct batadv_unicast_packet *unicast_packet;
 	struct ethhdr *ethhdr = eth_hdr(skb);
 	int res, hdr_len, ret = NET_RX_DROP;
-	struct sk_buff *new_skb;
 
 	unicast_packet = (struct batadv_unicast_packet *)skb->data;
 
@@ -674,46 +671,12 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 	if (!orig_node)
 		goto out;
 
-	/* find_router() increases neigh_nodes refcount if found. */
-	neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
-
-	if (!neigh_node)
-		goto out;
-
 	/* create a copy of the skb, if needed, to modify it. */
 	if (skb_cow(skb, ETH_HLEN) < 0)
 		goto out;
 
-	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-
-	if (unicast_packet->header.packet_type == BATADV_UNICAST &&
-	    atomic_read(&bat_priv->fragmentation) &&
-	    skb->len > neigh_node->if_incoming->net_dev->mtu) {
-		ret = batadv_frag_send_skb(skb, bat_priv,
-					   neigh_node->if_incoming,
-					   neigh_node->addr);
-		goto out;
-	}
-
-	if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG &&
-	    batadv_frag_can_reassemble(skb,
-				       neigh_node->if_incoming->net_dev->mtu)) {
-		ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
-
-		if (ret == NET_RX_DROP)
-			goto out;
-
-		/* packet was buffered for late merge */
-		if (!new_skb) {
-			ret = NET_RX_SUCCESS;
-			goto out;
-		}
-
-		skb = new_skb;
-		unicast_packet = (struct batadv_unicast_packet *)skb->data;
-	}
-
 	/* decrement ttl */
+	unicast_packet = (struct batadv_unicast_packet *)skb->data;
 	unicast_packet->header.ttl--;
 
 	switch (unicast_packet->header.packet_type) {
@@ -748,8 +711,6 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 	}
 
 out:
-	if (neigh_node)
-		batadv_neigh_node_free_ref(neigh_node);
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
 	return ret;
@@ -1003,51 +964,6 @@ rx_success:
 	return batadv_route_unicast_packet(skb, recv_if);
 }
 
-int batadv_recv_ucast_frag_packet(struct sk_buff *skb,
-				  struct batadv_hard_iface *recv_if)
-{
-	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
-	struct batadv_unicast_frag_packet *unicast_packet;
-	int hdr_size = sizeof(*unicast_packet);
-	struct sk_buff *new_skb = NULL;
-	int ret;
-
-	if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
-		return NET_RX_DROP;
-
-	if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
-		return NET_RX_DROP;
-
-	unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
-
-	/* packet for me */
-	if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
-		ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb);
-
-		if (ret == NET_RX_DROP)
-			return NET_RX_DROP;
-
-		/* packet was buffered for late merge */
-		if (!new_skb)
-			return NET_RX_SUCCESS;
-
-		if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb,
-							  hdr_size))
-			goto rx_success;
-		if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb,
-							hdr_size))
-			goto rx_success;
-
-		batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if,
-				    sizeof(struct batadv_unicast_packet), NULL);
-
-rx_success:
-		return NET_RX_SUCCESS;
-	}
-
-	return batadv_route_unicast_packet(skb, recv_if);
-}
-
 /**
  * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets
  * @skb: unicast tvlv packet to process
diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h
index ea15fa6..efab583 100644
--- a/net/batman-adv/routing.h
+++ b/net/batman-adv/routing.h
@@ -30,8 +30,6 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 			    struct batadv_hard_iface *recv_if);
 int batadv_recv_unicast_packet(struct sk_buff *skb,
 			       struct batadv_hard_iface *recv_if);
-int batadv_recv_ucast_frag_packet(struct sk_buff *skb,
-				  struct batadv_hard_iface *recv_if);
 int batadv_recv_bcast_packet(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if);
 int batadv_recv_tt_query(struct sk_buff *skb,
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 81d69fb..b8356ec 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -25,6 +25,7 @@
 #include "soft-interface.h"
 #include "hard-interface.h"
 #include "gateway_common.h"
+#include "gateway_client.h"
 #include "originator.h"
 #include "network-coding.h"
 
@@ -127,6 +128,179 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 	return ret;
 }
 
+/**
+ * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
+ *  common fields for unicast packets
+ * @skb: the skb carrying the unicast header to initialize
+ * @hdr_size: amount of bytes to push at the beginning of the skb
+ * @orig_node: the destination node
+ *
+ * Returns false if the buffer extension was not possible or true otherwise.
+ */
+static bool
+batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
+				  struct batadv_orig_node *orig_node)
+{
+	struct batadv_unicast_packet *unicast_packet;
+	uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
+
+	if (batadv_skb_head_push(skb, hdr_size) < 0)
+		return false;
+
+	unicast_packet = (struct batadv_unicast_packet *)skb->data;
+	unicast_packet->header.version = BATADV_COMPAT_VERSION;
+	/* batman packet type: unicast */
+	unicast_packet->header.packet_type = BATADV_UNICAST;
+	/* set unicast ttl */
+	unicast_packet->header.ttl = BATADV_TTL;
+	/* copy the destination for faster routing */
+	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
+	/* set the destination tt version number */
+	unicast_packet->ttvn = ttvn;
+
+	return true;
+}
+
+/**
+ * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
+ * @skb: the skb containing the payload to encapsulate
+ * @orig_node: the destination node
+ *
+ * Returns false if the payload could not be encapsulated or true otherwise.
+ */
+static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
+					    struct batadv_orig_node *orig_node)
+{
+	size_t uni_size = sizeof(struct batadv_unicast_packet);
+
+	return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
+}
+
+/**
+ * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
+ *  unicast 4addr header
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the skb containing the payload to encapsulate
+ * @orig_node: the destination node
+ * @packet_subtype: the unicast 4addr packet subtype to use
+ *
+ * Returns false if the payload could not be encapsulated or true otherwise.
+ */
+bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
+					   struct sk_buff *skb,
+					   struct batadv_orig_node *orig,
+					   int packet_subtype)
+{
+	struct batadv_hard_iface *primary_if;
+	struct batadv_unicast_4addr_packet *uc_4addr_packet;
+	bool ret = false;
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (!primary_if)
+		goto out;
+
+	/* Pull the header space and fill the unicast_packet substructure.
+	 * We can do that because the first member of the uc_4addr_packet
+	 * is of type struct unicast_packet
+	 */
+	if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
+					       orig))
+		goto out;
+
+	uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
+	uc_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR;
+	memcpy(uc_4addr_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
+	uc_4addr_packet->subtype = packet_subtype;
+	uc_4addr_packet->reserved = 0;
+
+	ret = true;
+out:
+	if (primary_if)
+		batadv_hardif_free_ref(primary_if);
+	return ret;
+}
+
+/**
+ * batadv_send_generic_unicast_skb - send an skb as unicast
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: payload to send
+ * @packet_type: the batman unicast packet type to use
+ * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
+ *  4addr packets)
+ *
+ * Returns 1 in case of error or 0 otherwise.
+ */
+int batadv_send_skb_generic_unicast(struct batadv_priv *bat_priv,
+				    struct sk_buff *skb, int packet_type,
+				    int packet_subtype)
+{
+	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
+	struct batadv_unicast_packet *unicast_packet;
+	struct batadv_orig_node *orig_node;
+	struct batadv_neigh_node *neigh_node;
+	int ret = NET_RX_DROP;
+
+	/* get routing information */
+	if (is_multicast_ether_addr(ethhdr->h_dest)) {
+		orig_node = batadv_gw_get_selected_orig(bat_priv);
+		if (orig_node)
+			goto find_router;
+	}
+
+	/* check for tt host - increases orig_node refcount.
+	 * returns NULL in case of AP isolation
+	 */
+	orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
+					     ethhdr->h_dest);
+
+find_router:
+	/* find_router():
+	 *  - if orig_node is NULL it returns NULL
+	 *  - increases neigh_nodes refcount if found.
+	 */
+	neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
+
+	if (!neigh_node)
+		goto out;
+
+	switch (packet_type) {
+	case BATADV_UNICAST:
+		batadv_send_skb_prepare_unicast(skb, orig_node);
+		break;
+	case BATADV_UNICAST_4ADDR:
+		batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, orig_node,
+						      packet_subtype);
+		break;
+	default:
+		/* this function supports UNICAST and UNICAST_4ADDR only. It
+		 * should never be invoked with any other packet type
+		 */
+		goto out;
+	}
+
+	unicast_packet = (struct batadv_unicast_packet *)skb->data;
+
+	/* inform the destination node that we are still missing a correct route
+	 * for this client. The destination will receive this packet and will
+	 * try to reroute it because the ttvn contained in the header is less
+	 * than the current one
+	 */
+	if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
+		unicast_packet->ttvn = unicast_packet->ttvn - 1;
+
+	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
+		ret = 0;
+
+out:
+	if (neigh_node)
+		batadv_neigh_node_free_ref(neigh_node);
+	if (orig_node)
+		batadv_orig_node_free_ref(orig_node);
+	if (ret == NET_RX_DROP)
+		kfree_skb(skb);
+	return ret;
+}
+
 void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
 {
 	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
diff --git a/net/batman-adv/send.h b/net/batman-adv/send.h
index e7b1788..ad63184 100644
--- a/net/batman-adv/send.h
+++ b/net/batman-adv/send.h
@@ -34,5 +34,45 @@ void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work);
 void
 batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
 				 const struct batadv_hard_iface *hard_iface);
+bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
+					   struct sk_buff *skb,
+					   struct batadv_orig_node *orig_node,
+					   int packet_subtype);
+int batadv_send_skb_generic_unicast(struct batadv_priv *bat_priv,
+				    struct sk_buff *skb, int packet_type,
+				    int packet_subtype);
+
+
+/**
+ * batadv_send_unicast_skb - send the skb encapsulated in a unicast packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the payload to send
+ *
+ * Returns 1 in case of error or 0 otherwise.
+ */
+static inline int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
+					  struct sk_buff *skb)
+{
+	return batadv_send_skb_generic_unicast(bat_priv, skb, BATADV_UNICAST,
+					       0);
+}
+
+/**
+ * batadv_send_4addr_unicast_skb - send the skb encapsulated in a unicast 4addr
+ *  packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the payload to send
+ * @packet_subtype: the unicast 4addr packet subtype to use
+ *
+ * Returns 1 in case of error or 0 otherwise.
+ */
+static inline int batadv_send_skb_unicast_4addr(struct batadv_priv *bat_priv,
+						struct sk_buff *skb,
+						int packet_subtype)
+{
+	return batadv_send_skb_generic_unicast(bat_priv, skb,
+					       BATADV_UNICAST_4ADDR,
+					       packet_subtype);
+}
 
 #endif /* _NET_BATMAN_ADV_SEND_H_ */
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 25e6004..504d0bb 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -34,8 +34,6 @@
 #include <linux/ethtool.h>
 #include <linux/etherdevice.h>
 #include <linux/if_vlan.h>
-#include <linux/if_ether.h>
-#include "unicast.h"
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
 
@@ -286,7 +284,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
 
 		batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
 
-		ret = batadv_unicast_send_skb(bat_priv, skb);
+		ret = batadv_send_skb_unicast(bat_priv, skb);
 		if (ret != 0)
 			goto dropped_freed;
 	}
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 8fbd89d..795a079 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -60,7 +60,6 @@ struct batadv_hard_iface_bat_iv {
  * @if_num: identificator of the interface
  * @if_status: status of the interface for batman-adv
  * @net_dev: pointer to the net_device
- * @frag_seqno: last fragment sequence number sent by this interface
  * @num_bcasts: number of payload re-broadcasts on this interface (ARQ)
  * @hardif_obj: kobject of the per interface sysfs "mesh" directory
  * @refcount: number of contexts the object is used
@@ -76,7 +75,6 @@ struct batadv_hard_iface {
 	int16_t if_num;
 	char if_status;
 	struct net_device *net_dev;
-	atomic_t frag_seqno;
 	uint8_t num_bcasts;
 	struct kobject *hardif_obj;
 	atomic_t refcount;
@@ -116,9 +114,6 @@ struct batadv_hard_iface {
  *  last_bcast_seqno)
  * @last_bcast_seqno: last broadcast sequence number received by this host
  * @neigh_list: list of potential next hop neighbor towards this orig node
- * @frag_list: fragmentation buffer list for fragment re-assembly
- * @last_frag_packet: time when last fragmented packet from this node was
- *  received
  * @neigh_list_lock: lock protecting neigh_list, router and bonding_list
  * @hash_entry: hlist node for batadv_priv::orig_hash
  * @bat_priv: pointer to soft_iface this orig node belongs to
@@ -159,8 +154,6 @@ struct batadv_orig_node {
 	DECLARE_BITMAP(bcast_bits, BATADV_TQ_LOCAL_WINDOW_SIZE);
 	uint32_t last_bcast_seqno;
 	struct hlist_head neigh_list;
-	struct list_head frag_list;
-	unsigned long last_frag_packet;
 	/* neigh_list_lock protects: neigh_list, router & bonding_list */
 	spinlock_t neigh_list_lock;
 	struct hlist_node hash_entry;
@@ -874,18 +867,6 @@ struct batadv_forw_packet {
 };
 
 /**
- * struct batadv_frag_packet_list_entry - storage for fragment packet
- * @list: list node for orig_node::frag_list
- * @seqno: sequence number of the fragment
- * @skb: fragment's skb buffer
- */
-struct batadv_frag_packet_list_entry {
-	struct list_head list;
-	uint16_t seqno;
-	struct sk_buff *skb;
-};
-
-/**
  * struct batadv_algo_ops - mesh algorithm callbacks
  * @list: list node for the batadv_algo_list
  * @name: name of the algorithm
diff --git a/net/batman-adv/unicast.c b/net/batman-adv/unicast.c
deleted file mode 100644
index 48b31d3..0000000
--- a/net/batman-adv/unicast.c
+++ /dev/null
@@ -1,491 +0,0 @@
-/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
- *
- * Andreas Langer
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
- */
-
-#include "main.h"
-#include "unicast.h"
-#include "send.h"
-#include "soft-interface.h"
-#include "gateway_client.h"
-#include "originator.h"
-#include "hash.h"
-#include "translation-table.h"
-#include "routing.h"
-#include "hard-interface.h"
-
-
-static struct sk_buff *
-batadv_frag_merge_packet(struct list_head *head,
-			 struct batadv_frag_packet_list_entry *tfp,
-			 struct sk_buff *skb)
-{
-	struct batadv_unicast_frag_packet *up;
-	struct sk_buff *tmp_skb;
-	struct batadv_unicast_packet *unicast_packet;
-	int hdr_len = sizeof(*unicast_packet);
-	int uni_diff = sizeof(*up) - hdr_len;
-	uint8_t *packet_pos;
-
-	up = (struct batadv_unicast_frag_packet *)skb->data;
-	/* set skb to the first part and tmp_skb to the second part */
-	if (up->flags & BATADV_UNI_FRAG_HEAD) {
-		tmp_skb = tfp->skb;
-	} else {
-		tmp_skb = skb;
-		skb = tfp->skb;
-	}
-
-	if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0)
-		goto err;
-
-	skb_pull(tmp_skb, sizeof(*up));
-	if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0)
-		goto err;
-
-	/* move free entry to end */
-	tfp->skb = NULL;
-	tfp->seqno = 0;
-	list_move_tail(&tfp->list, head);
-
-	memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
-	kfree_skb(tmp_skb);
-
-	memmove(skb->data + uni_diff, skb->data, hdr_len);
-	packet_pos = skb_pull(skb, uni_diff);
-	unicast_packet = (struct batadv_unicast_packet *)packet_pos;
-	unicast_packet->header.packet_type = BATADV_UNICAST;
-
-	return skb;
-
-err:
-	/* free buffered skb, skb will be freed later */
-	kfree_skb(tfp->skb);
-	return NULL;
-}
-
-static void batadv_frag_create_entry(struct list_head *head,
-				     struct sk_buff *skb)
-{
-	struct batadv_frag_packet_list_entry *tfp;
-	struct batadv_unicast_frag_packet *up;
-
-	up = (struct batadv_unicast_frag_packet *)skb->data;
-
-	/* free and oldest packets stand at the end */
-	tfp = list_entry((head)->prev, typeof(*tfp), list);
-	kfree_skb(tfp->skb);
-
-	tfp->seqno = ntohs(up->seqno);
-	tfp->skb = skb;
-	list_move(&tfp->list, head);
-	return;
-}
-
-static int batadv_frag_create_buffer(struct list_head *head)
-{
-	int i;
-	struct batadv_frag_packet_list_entry *tfp;
-
-	for (i = 0; i < BATADV_FRAG_BUFFER_SIZE; i++) {
-		tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC);
-		if (!tfp) {
-			batadv_frag_list_free(head);
-			return -ENOMEM;
-		}
-		tfp->skb = NULL;
-		tfp->seqno = 0;
-		INIT_LIST_HEAD(&tfp->list);
-		list_add(&tfp->list, head);
-	}
-
-	return 0;
-}
-
-static struct batadv_frag_packet_list_entry *
-batadv_frag_search_packet(struct list_head *head,
-			  const struct batadv_unicast_frag_packet *up)
-{
-	struct batadv_frag_packet_list_entry *tfp;
-	struct batadv_unicast_frag_packet *tmp_up = NULL;
-	bool is_head_tmp, is_head;
-	uint16_t search_seqno;
-
-	if (up->flags & BATADV_UNI_FRAG_HEAD)
-		search_seqno = ntohs(up->seqno)+1;
-	else
-		search_seqno = ntohs(up->seqno)-1;
-
-	is_head = up->flags & BATADV_UNI_FRAG_HEAD;
-
-	list_for_each_entry(tfp, head, list) {
-		if (!tfp->skb)
-			continue;
-
-		if (tfp->seqno == ntohs(up->seqno))
-			goto mov_tail;
-
-		tmp_up = (struct batadv_unicast_frag_packet *)tfp->skb->data;
-
-		if (tfp->seqno == search_seqno) {
-			is_head_tmp = tmp_up->flags & BATADV_UNI_FRAG_HEAD;
-			if (is_head_tmp != is_head)
-				return tfp;
-			else
-				goto mov_tail;
-		}
-	}
-	return NULL;
-
-mov_tail:
-	list_move_tail(&tfp->list, head);
-	return NULL;
-}
-
-void batadv_frag_list_free(struct list_head *head)
-{
-	struct batadv_frag_packet_list_entry *pf, *tmp_pf;
-
-	if (!list_empty(head)) {
-		list_for_each_entry_safe(pf, tmp_pf, head, list) {
-			kfree_skb(pf->skb);
-			list_del(&pf->list);
-			kfree(pf);
-		}
-	}
-	return;
-}
-
-/* frag_reassemble_skb():
- * returns NET_RX_DROP if the operation failed - skb is left intact
- * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL)
- * or the skb could be reassembled (skb_new will point to the new packet and
- * skb was freed)
- */
-int batadv_frag_reassemble_skb(struct sk_buff *skb,
-			       struct batadv_priv *bat_priv,
-			       struct sk_buff **new_skb)
-{
-	struct batadv_orig_node *orig_node;
-	struct batadv_frag_packet_list_entry *tmp_frag_entry;
-	int ret = NET_RX_DROP;
-	struct batadv_unicast_frag_packet *unicast_packet;
-
-	unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
-	*new_skb = NULL;
-
-	orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->orig);
-	if (!orig_node)
-		goto out;
-
-	orig_node->last_frag_packet = jiffies;
-
-	if (list_empty(&orig_node->frag_list) &&
-	    batadv_frag_create_buffer(&orig_node->frag_list)) {
-		pr_debug("couldn't create frag buffer\n");
-		goto out;
-	}
-
-	tmp_frag_entry = batadv_frag_search_packet(&orig_node->frag_list,
-						   unicast_packet);
-
-	if (!tmp_frag_entry) {
-		batadv_frag_create_entry(&orig_node->frag_list, skb);
-		ret = NET_RX_SUCCESS;
-		goto out;
-	}
-
-	*new_skb = batadv_frag_merge_packet(&orig_node->frag_list,
-					    tmp_frag_entry, skb);
-	/* if not, merge failed */
-	if (*new_skb)
-		ret = NET_RX_SUCCESS;
-
-out:
-	if (orig_node)
-		batadv_orig_node_free_ref(orig_node);
-	return ret;
-}
-
-int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
-			 struct batadv_hard_iface *hard_iface,
-			 const uint8_t dstaddr[])
-{
-	struct batadv_unicast_packet tmp_uc, *unicast_packet;
-	struct batadv_hard_iface *primary_if;
-	struct sk_buff *frag_skb;
-	struct batadv_unicast_frag_packet *frag1, *frag2;
-	int uc_hdr_len = sizeof(*unicast_packet);
-	int ucf_hdr_len = sizeof(*frag1);
-	int data_len = skb->len - uc_hdr_len;
-	int large_tail = 0, ret = NET_RX_DROP;
-	uint16_t seqno;
-
-	primary_if = batadv_primary_if_get_selected(bat_priv);
-	if (!primary_if)
-		goto dropped;
-
-	frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
-	if (!frag_skb)
-		goto dropped;
-
-	skb->priority = TC_PRIO_CONTROL;
-	skb_reserve(frag_skb, ucf_hdr_len);
-
-	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-	memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
-	skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len);
-
-	if (batadv_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 ||
-	    batadv_skb_head_push(frag_skb, ucf_hdr_len) < 0)
-		goto drop_frag;
-
-	frag1 = (struct batadv_unicast_frag_packet *)skb->data;
-	frag2 = (struct batadv_unicast_frag_packet *)frag_skb->data;
-
-	memcpy(frag1, &tmp_uc, sizeof(tmp_uc));
-
-	frag1->header.ttl--;
-	frag1->header.version = BATADV_COMPAT_VERSION;
-	frag1->header.packet_type = BATADV_UNICAST_FRAG;
-
-	memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
-	memcpy(frag2, frag1, sizeof(*frag2));
-
-	if (data_len & 1)
-		large_tail = BATADV_UNI_FRAG_LARGETAIL;
-
-	frag1->flags = BATADV_UNI_FRAG_HEAD | large_tail;
-	frag2->flags = large_tail;
-
-	seqno = atomic_add_return(2, &hard_iface->frag_seqno);
-	frag1->seqno = htons(seqno - 1);
-	frag2->seqno = htons(seqno);
-
-	batadv_send_skb_packet(skb, hard_iface, dstaddr);
-	batadv_send_skb_packet(frag_skb, hard_iface, dstaddr);
-	ret = NET_RX_SUCCESS;
-	goto out;
-
-drop_frag:
-	kfree_skb(frag_skb);
-dropped:
-	kfree_skb(skb);
-out:
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
-	return ret;
-}
-
-/**
- * batadv_unicast_push_and_fill_skb - extends the buffer and initializes the
- * common fields for unicast packets
- * @skb: packet
- * @hdr_size: amount of bytes to push at the beginning of the skb
- * @orig_node: the destination node
- *
- * Returns false if the buffer extension was not possible or true otherwise
- */
-static bool batadv_unicast_push_and_fill_skb(struct sk_buff *skb, int hdr_size,
-					     struct batadv_orig_node *orig_node)
-{
-	struct batadv_unicast_packet *unicast_packet;
-	uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
-
-	if (batadv_skb_head_push(skb, hdr_size) < 0)
-		return false;
-
-	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-	unicast_packet->header.version = BATADV_COMPAT_VERSION;
-	/* batman packet type: unicast */
-	unicast_packet->header.packet_type = BATADV_UNICAST;
-	/* set unicast ttl */
-	unicast_packet->header.ttl = BATADV_TTL;
-	/* copy the destination for faster routing */
-	memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
-	/* set the destination tt version number */
-	unicast_packet->ttvn = ttvn;
-
-	return true;
-}
-
-/**
- * batadv_unicast_prepare_skb - encapsulate an skb with a unicast header
- * @skb: the skb containing the payload to encapsulate
- * @orig_node: the destination node
- *
- * Returns false if the payload could not be encapsulated or true otherwise.
- *
- * This call might reallocate skb data.
- */
-static bool batadv_unicast_prepare_skb(struct sk_buff *skb,
-				       struct batadv_orig_node *orig_node)
-{
-	size_t uni_size = sizeof(struct batadv_unicast_packet);
-	return batadv_unicast_push_and_fill_skb(skb, uni_size, orig_node);
-}
-
-/**
- * batadv_unicast_4addr_prepare_skb - encapsulate an skb with a unicast4addr
- * header
- * @bat_priv: the bat priv with all the soft interface information
- * @skb: the skb containing the payload to encapsulate
- * @orig_node: the destination node
- * @packet_subtype: the batman 4addr packet subtype to use
- *
- * Returns false if the payload could not be encapsulated or true otherwise.
- *
- * This call might reallocate skb data.
- */
-bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
-				      struct sk_buff *skb,
-				      struct batadv_orig_node *orig,
-				      int packet_subtype)
-{
-	struct batadv_hard_iface *primary_if;
-	struct batadv_unicast_4addr_packet *unicast_4addr_packet;
-	bool ret = false;
-
-	primary_if = batadv_primary_if_get_selected(bat_priv);
-	if (!primary_if)
-		goto out;
-
-	/* pull the header space and fill the unicast_packet substructure.
-	 * We can do that because the first member of the unicast_4addr_packet
-	 * is of type struct unicast_packet
-	 */
-	if (!batadv_unicast_push_and_fill_skb(skb,
-					      sizeof(*unicast_4addr_packet),
-					      orig))
-		goto out;
-
-	unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
-	unicast_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR;
-	memcpy(unicast_4addr_packet->src, primary_if->net_dev->dev_addr,
-	       ETH_ALEN);
-	unicast_4addr_packet->subtype = packet_subtype;
-	unicast_4addr_packet->reserved = 0;
-
-	ret = true;
-out:
-	if (primary_if)
-		batadv_hardif_free_ref(primary_if);
-	return ret;
-}
-
-/**
- * batadv_unicast_generic_send_skb - send an skb as unicast
- * @bat_priv: the bat priv with all the soft interface information
- * @skb: payload to send
- * @packet_type: the batman unicast packet type to use
- * @packet_subtype: the batman packet subtype. It is ignored if packet_type is
- *		    not BATADV_UNICAT_4ADDR
- *
- * Returns 1 in case of error or 0 otherwise
- */
-int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
-				    struct sk_buff *skb, int packet_type,
-				    int packet_subtype)
-{
-	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
-	struct batadv_unicast_packet *unicast_packet;
-	struct batadv_orig_node *orig_node;
-	struct batadv_neigh_node *neigh_node;
-	int data_len = skb->len;
-	int ret = NET_RX_DROP;
-	unsigned int dev_mtu, header_len;
-
-	/* get routing information */
-	if (is_multicast_ether_addr(ethhdr->h_dest)) {
-		orig_node = batadv_gw_get_selected_orig(bat_priv);
-		if (orig_node)
-			goto find_router;
-	}
-
-	/* check for tt host - increases orig_node refcount.
-	 * returns NULL in case of AP isolation
-	 */
-	orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
-					     ethhdr->h_dest);
-
-find_router:
-	/* find_router():
-	 *  - if orig_node is NULL it returns NULL
-	 *  - increases neigh_nodes refcount if found.
-	 */
-	neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
-
-	if (!neigh_node)
-		goto out;
-
-	switch (packet_type) {
-	case BATADV_UNICAST:
-		if (!batadv_unicast_prepare_skb(skb, orig_node))
-			goto out;
-
-		header_len = sizeof(struct batadv_unicast_packet);
-		break;
-	case BATADV_UNICAST_4ADDR:
-		if (!batadv_unicast_4addr_prepare_skb(bat_priv, skb, orig_node,
-						      packet_subtype))
-			goto out;
-
-		header_len = sizeof(struct batadv_unicast_4addr_packet);
-		break;
-	default:
-		/* this function supports UNICAST and UNICAST_4ADDR only. It
-		 * should never be invoked with any other packet type
-		 */
-		goto out;
-	}
-
-	ethhdr = (struct ethhdr *)(skb->data + header_len);
-	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-
-	/* inform the destination node that we are still missing a correct route
-	 * for this client. The destination will receive this packet and will
-	 * try to reroute it because the ttvn contained in the header is less
-	 * than the current one
-	 */
-	if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
-		unicast_packet->ttvn = unicast_packet->ttvn - 1;
-
-	dev_mtu = neigh_node->if_incoming->net_dev->mtu;
-	/* fragmentation mechanism only works for UNICAST (now) */
-	if (packet_type == BATADV_UNICAST &&
-	    atomic_read(&bat_priv->fragmentation) &&
-	    data_len + sizeof(*unicast_packet) > dev_mtu) {
-		/* send frag skb decreases ttl */
-		unicast_packet->header.ttl++;
-		ret = batadv_frag_send_skb(skb, bat_priv,
-					   neigh_node->if_incoming,
-					   neigh_node->addr);
-		goto out;
-	}
-
-	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
-		ret = 0;
-
-out:
-	if (neigh_node)
-		batadv_neigh_node_free_ref(neigh_node);
-	if (orig_node)
-		batadv_orig_node_free_ref(orig_node);
-	if (ret == NET_RX_DROP)
-		kfree_skb(skb);
-	return ret;
-}
diff --git a/net/batman-adv/unicast.h b/net/batman-adv/unicast.h
deleted file mode 100644
index 429cf8a..0000000
--- a/net/batman-adv/unicast.h
+++ /dev/null
@@ -1,92 +0,0 @@
-/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
- *
- * Andreas Langer
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
- */
-
-#ifndef _NET_BATMAN_ADV_UNICAST_H_
-#define _NET_BATMAN_ADV_UNICAST_H_
-
-#include "packet.h"
-
-#define BATADV_FRAG_TIMEOUT 10000 /* purge frag list entries after time in ms */
-#define BATADV_FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */
-
-int batadv_frag_reassemble_skb(struct sk_buff *skb,
-			       struct batadv_priv *bat_priv,
-			       struct sk_buff **new_skb);
-void batadv_frag_list_free(struct list_head *head);
-int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
-			 struct batadv_hard_iface *hard_iface,
-			 const uint8_t dstaddr[]);
-bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
-				      struct sk_buff *skb,
-				      struct batadv_orig_node *orig_node,
-				      int packet_subtype);
-int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
-				    struct sk_buff *skb, int packet_type,
-				    int packet_subtype);
-
-
-/**
- * batadv_unicast_send_skb - send the skb encapsulated in a unicast packet
- * @bat_priv: the bat priv with all the soft interface information
- * @skb: the payload to send
- */
-static inline int batadv_unicast_send_skb(struct batadv_priv *bat_priv,
-					  struct sk_buff *skb)
-{
-	return batadv_unicast_generic_send_skb(bat_priv, skb, BATADV_UNICAST,
-					       0);
-}
-
-/**
- * batadv_unicast_send_skb - send the skb encapsulated in a unicast4addr packet
- * @bat_priv: the bat priv with all the soft interface information
- * @skb: the payload to send
- * @packet_subtype: the batman 4addr packet subtype to use
- */
-static inline int batadv_unicast_4addr_send_skb(struct batadv_priv *bat_priv,
-						struct sk_buff *skb,
-						int packet_subtype)
-{
-	return batadv_unicast_generic_send_skb(bat_priv, skb,
-					       BATADV_UNICAST_4ADDR,
-					       packet_subtype);
-}
-
-static inline int batadv_frag_can_reassemble(const struct sk_buff *skb, int mtu)
-{
-	const struct batadv_unicast_frag_packet *unicast_packet;
-	int uneven_correction = 0;
-	unsigned int merged_size;
-
-	unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
-
-	if (unicast_packet->flags & BATADV_UNI_FRAG_LARGETAIL) {
-		if (unicast_packet->flags & BATADV_UNI_FRAG_HEAD)
-			uneven_correction = 1;
-		else
-			uneven_correction = -1;
-	}
-
-	merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
-	merged_size += sizeof(struct batadv_unicast_packet) + uneven_correction;
-
-	return merged_size <= mtu;
-}
-
-#endif /* _NET_BATMAN_ADV_UNICAST_H_ */
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 08/16] batman-adv: Receive fragmented packets and merge
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, b.a.t.m.a.n, Martin Hundebøll, Marek Lindner,
	Antonio Quartulli

From: Martin Hundebøll <martin@hundeboll.net>

Fragments arriving at their destination are buffered for later merge.
Merged packets are passed to the main receive function as had they never
been fragmented.

Fragments are forwarded without merging if the MTU of the outgoing
interface is smaller than the size of the merged packet.

Signed-off-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/Makefile         |   1 +
 net/batman-adv/fragmentation.c  | 370 ++++++++++++++++++++++++++++++++++++++++
 net/batman-adv/fragmentation.h  |  47 +++++
 net/batman-adv/main.c           |   4 +
 net/batman-adv/main.h           |   9 +
 net/batman-adv/originator.c     |  14 +-
 net/batman-adv/packet.h         |  27 +++
 net/batman-adv/routing.c        |  59 +++++++
 net/batman-adv/routing.h        |   2 +
 net/batman-adv/soft-interface.c |   4 +
 net/batman-adv/types.h          |  38 +++++
 11 files changed, 574 insertions(+), 1 deletion(-)
 create mode 100644 net/batman-adv/fragmentation.c
 create mode 100644 net/batman-adv/fragmentation.h

diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile
index f9b465b..4f4aabb 100644
--- a/net/batman-adv/Makefile
+++ b/net/batman-adv/Makefile
@@ -24,6 +24,7 @@ batman-adv-y += bitarray.o
 batman-adv-$(CONFIG_BATMAN_ADV_BLA) += bridge_loop_avoidance.o
 batman-adv-y += debugfs.o
 batman-adv-$(CONFIG_BATMAN_ADV_DAT) += distributed-arp-table.o
+batman-adv-y += fragmentation.o
 batman-adv-y += gateway_client.o
 batman-adv-y += gateway_common.o
 batman-adv-y += hard-interface.o
diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
new file mode 100644
index 0000000..c829d3c
--- /dev/null
+++ b/net/batman-adv/fragmentation.c
@@ -0,0 +1,370 @@
+/* Copyright (C) 2013 B.A.T.M.A.N. contributors:
+ *
+ * Martin Hundebøll <martin@hundeboll.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include "main.h"
+#include "fragmentation.h"
+#include "send.h"
+#include "originator.h"
+#include "routing.h"
+#include "hard-interface.h"
+#include "soft-interface.h"
+
+
+/**
+ * batadv_frag_clear_chain - delete entries in the fragment buffer chain
+ * @head: head of chain with entries.
+ *
+ * Free fragments in the passed hlist. Should be called with appropriate lock.
+ */
+static void batadv_frag_clear_chain(struct hlist_head *head)
+{
+	struct batadv_frag_list_entry *entry;
+	struct hlist_node *node;
+
+	hlist_for_each_entry_safe(entry, node, head, list) {
+		hlist_del(&entry->list);
+		kfree_skb(entry->skb);
+		kfree(entry);
+	}
+}
+
+/**
+ * batadv_frag_purge_orig - free fragments associated to an orig
+ * @orig_node: originator to free fragments from
+ * @check_cb: optional function to tell if an entry should be purged
+ */
+void batadv_frag_purge_orig(struct batadv_orig_node *orig_node,
+			    bool (*check_cb)(struct batadv_frag_table_entry *))
+{
+	struct batadv_frag_table_entry *chain;
+	uint8_t i;
+
+	for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
+		chain = &orig_node->fragments[i];
+		spin_lock_bh(&orig_node->fragments[i].lock);
+
+		if (!check_cb || check_cb(chain)) {
+			batadv_frag_clear_chain(&orig_node->fragments[i].head);
+			orig_node->fragments[i].size = 0;
+		}
+
+		spin_unlock_bh(&orig_node->fragments[i].lock);
+	}
+}
+
+/**
+ * batadv_frag_size_limit - maximum possible size of packet to be fragmented
+ *
+ * Returns the maximum size of payload that can be fragmented.
+ */
+static int batadv_frag_size_limit(void)
+{
+	int limit = BATADV_FRAG_MAX_FRAG_SIZE;
+
+	limit -= sizeof(struct batadv_frag_packet);
+	limit *= BATADV_FRAG_MAX_FRAGMENTS;
+
+	return limit;
+}
+
+/**
+ * batadv_frag_init_chain - check and prepare fragment chain for new fragment
+ * @chain: chain in fragments table to init
+ * @seqno: sequence number of the received fragment
+ *
+ * Make chain ready for a fragment with sequence number "seqno". Delete existing
+ * entries if they have an "old" sequence number.
+ *
+ * Caller must hold chain->lock.
+ *
+ * Returns true if chain is empty and caller can just insert the new fragment
+ * without searching for the right position.
+ */
+static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain,
+				   uint16_t seqno)
+{
+	if (chain->seqno == seqno)
+		return false;
+
+	if (!hlist_empty(&chain->head))
+		batadv_frag_clear_chain(&chain->head);
+
+	chain->size = 0;
+	chain->seqno = seqno;
+
+	return true;
+}
+
+/**
+ * batadv_frag_insert_packet - insert a fragment into a fragment chain
+ * @orig_node: originator that the fragment was received from
+ * @skb: skb to insert
+ * @chain_out: list head to attach complete chains of fragments to
+ *
+ * Insert a new fragment into the reverse ordered chain in the right table
+ * entry. The hash table entry is cleared if "old" fragments exist in it.
+ *
+ * Returns true if skb is buffered, false on error. If the chain has all the
+ * fragments needed to merge the packet, the chain is moved to the passed head
+ * to avoid locking the chain in the table.
+ */
+static bool batadv_frag_insert_packet(struct batadv_orig_node *orig_node,
+				      struct sk_buff *skb,
+				      struct hlist_head *chain_out)
+{
+	struct batadv_frag_table_entry *chain;
+	struct batadv_frag_list_entry *frag_entry_new = NULL, *frag_entry_curr;
+	struct batadv_frag_packet *frag_packet;
+	uint8_t bucket;
+	uint16_t seqno, hdr_size = sizeof(struct batadv_frag_packet);
+	bool ret = false;
+
+	/* Linearize packet to avoid linearizing 16 packets in a row when doing
+	 * the later merge. Non-linear merge should be added to remove this
+	 * linearization.
+	 */
+	if (skb_linearize(skb) < 0)
+		goto err;
+
+	frag_packet = (struct batadv_frag_packet *)skb->data;
+	seqno = ntohs(frag_packet->seqno);
+	bucket = seqno % BATADV_FRAG_BUFFER_COUNT;
+
+	frag_entry_new = kmalloc(sizeof(*frag_entry_new), GFP_ATOMIC);
+	if (!frag_entry_new)
+		goto err;
+
+	frag_entry_new->skb = skb;
+	frag_entry_new->no = frag_packet->no;
+
+	/* Select entry in the "chain table" and delete any prior fragments
+	 * with another sequence number. batadv_frag_init_chain() returns true,
+	 * if the list is empty at return.
+	 */
+	chain = &orig_node->fragments[bucket];
+	spin_lock_bh(&chain->lock);
+	if (batadv_frag_init_chain(chain, seqno)) {
+		hlist_add_head(&frag_entry_new->list, &chain->head);
+		chain->size = skb->len - hdr_size;
+		chain->timestamp = jiffies;
+		ret = true;
+		goto out;
+	}
+
+	/* Find the position for the new fragment. */
+	hlist_for_each_entry(frag_entry_curr, &chain->head, list) {
+		/* Drop packet if fragment already exists. */
+		if (frag_entry_curr->no == frag_entry_new->no)
+			goto err_unlock;
+
+		/* Order fragments from highest to lowest. */
+		if (frag_entry_curr->no < frag_entry_new->no) {
+			hlist_add_before(&frag_entry_new->list,
+					 &frag_entry_curr->list);
+			chain->size += skb->len - hdr_size;
+			chain->timestamp = jiffies;
+			ret = true;
+			goto out;
+		}
+	}
+
+	/* Reached the end of the list, so insert after 'frag_entry_curr'. */
+	if (likely(frag_entry_curr)) {
+		hlist_add_after(&frag_entry_curr->list, &frag_entry_new->list);
+		chain->size += skb->len - hdr_size;
+		chain->timestamp = jiffies;
+		ret = true;
+	}
+
+out:
+	if (chain->size > batadv_frag_size_limit() ||
+	    ntohs(frag_packet->total_size) > batadv_frag_size_limit()) {
+		/* Clear chain if total size of either the list or the packet
+		 * exceeds the maximum size of one merged packet.
+		 */
+		batadv_frag_clear_chain(&chain->head);
+		chain->size = 0;
+	} else if (ntohs(frag_packet->total_size) == chain->size) {
+		/* All fragments received. Hand over chain to caller. */
+		hlist_move_list(&chain->head, chain_out);
+		chain->size = 0;
+	}
+
+err_unlock:
+	spin_unlock_bh(&chain->lock);
+
+err:
+	if (!ret)
+		kfree(frag_entry_new);
+
+	return ret;
+}
+
+/**
+ * batadv_frag_merge_packets - merge a chain of fragments
+ * @chain: head of chain with fragments
+ * @skb: packet with total size of skb after merging
+ *
+ * Expand the first skb in the chain and copy the content of the remaining
+ * skb's into the expanded one. After doing so, clear the chain.
+ *
+ * Returns the merged skb or NULL on error.
+ */
+static struct sk_buff *
+batadv_frag_merge_packets(struct hlist_head *chain, struct sk_buff *skb)
+{
+	struct batadv_frag_packet *packet;
+	struct batadv_frag_list_entry *entry;
+	struct sk_buff *skb_out = NULL;
+	int size, hdr_size = sizeof(struct batadv_frag_packet);
+
+	/* Make sure incoming skb has non-bogus data. */
+	packet = (struct batadv_frag_packet *)skb->data;
+	size = ntohs(packet->total_size);
+	if (size > batadv_frag_size_limit())
+		goto free;
+
+	/* Remove first entry, as this is the destination for the rest of the
+	 * fragments.
+	 */
+	entry = hlist_entry(chain->first, struct batadv_frag_list_entry, list);
+	hlist_del(&entry->list);
+	skb_out = entry->skb;
+	kfree(entry);
+
+	/* Make room for the rest of the fragments. */
+	if (pskb_expand_head(skb_out, 0, size - skb->len, GFP_ATOMIC) < 0) {
+		kfree_skb(skb_out);
+		skb_out = NULL;
+		goto free;
+	}
+
+	/* Move the existing MAC header to just before the payload. (Override
+	 * the fragment header.)
+	 */
+	skb_pull_rcsum(skb_out, hdr_size);
+	memmove(skb_out->data - ETH_HLEN, skb_mac_header(skb_out), ETH_HLEN);
+	skb_set_mac_header(skb_out, -ETH_HLEN);
+	skb_reset_network_header(skb_out);
+	skb_reset_transport_header(skb_out);
+
+	/* Copy the payload of the each fragment into the last skb */
+	hlist_for_each_entry(entry, chain, list) {
+		size = entry->skb->len - hdr_size;
+		memcpy(skb_put(skb_out, size), entry->skb->data + hdr_size,
+		       size);
+	}
+
+free:
+	/* Locking is not needed, because 'chain' is not part of any orig. */
+	batadv_frag_clear_chain(chain);
+	return skb_out;
+}
+
+/**
+ * batadv_frag_skb_buffer - buffer fragment for later merge
+ * @skb: skb to buffer
+ * @orig_node_src: originator that the skb is received from
+ *
+ * Add fragment to buffer and merge fragments if possible.
+ *
+ * There are three possible outcomes: 1) Packet is merged: Return true and
+ * set *skb to merged packet; 2) Packet is buffered: Return true and set *skb
+ * to NULL; 3) Error: Return false and leave skb as is.
+ */
+bool batadv_frag_skb_buffer(struct sk_buff **skb,
+			    struct batadv_orig_node *orig_node_src)
+{
+	struct sk_buff *skb_out = NULL;
+	struct hlist_head head = HLIST_HEAD_INIT;
+	bool ret = false;
+
+	/* Add packet to buffer and table entry if merge is possible. */
+	if (!batadv_frag_insert_packet(orig_node_src, *skb, &head))
+		goto out_err;
+
+	/* Leave if more fragments are needed to merge. */
+	if (hlist_empty(&head))
+		goto out;
+
+	skb_out = batadv_frag_merge_packets(&head, *skb);
+	if (!skb_out)
+		goto out_err;
+
+out:
+	*skb = skb_out;
+	ret = true;
+out_err:
+	return ret;
+}
+
+/**
+ * batadv_frag_skb_fwd - forward fragments that would exceed MTU when merged
+ * @skb: skb to forward
+ * @recv_if: interface that the skb is received on
+ * @orig_node_src: originator that the skb is received from
+ *
+ * Look up the next-hop of the fragments payload and check if the merged packet
+ * will exceed the MTU towards the next-hop. If so, the fragment is forwarded
+ * without merging it.
+ *
+ * Returns true if the fragment is consumed/forwarded, false otherwise.
+ */
+bool batadv_frag_skb_fwd(struct sk_buff *skb,
+			 struct batadv_hard_iface *recv_if,
+			 struct batadv_orig_node *orig_node_src)
+{
+	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct batadv_orig_node *orig_node_dst = NULL;
+	struct batadv_neigh_node *neigh_node = NULL;
+	struct batadv_frag_packet *packet;
+	uint16_t total_size;
+	bool ret = false;
+
+	packet = (struct batadv_frag_packet *)skb->data;
+	orig_node_dst = batadv_orig_hash_find(bat_priv, packet->dest);
+	if (!orig_node_dst)
+		goto out;
+
+	neigh_node = batadv_find_router(bat_priv, orig_node_dst, recv_if);
+	if (!neigh_node)
+		goto out;
+
+	/* Forward the fragment, if the merged packet would be too big to
+	 * be assembled.
+	 */
+	total_size = ntohs(packet->total_size);
+	if (total_size > neigh_node->if_incoming->net_dev->mtu) {
+		batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_FWD);
+		batadv_add_counter(bat_priv, BATADV_CNT_FRAG_FWD_BYTES,
+				   skb->len + ETH_HLEN);
+
+		packet->header.ttl--;
+		batadv_send_skb_packet(skb, neigh_node->if_incoming,
+				       neigh_node->addr);
+		ret = true;
+	}
+
+out:
+	if (orig_node_dst)
+		batadv_orig_node_free_ref(orig_node_dst);
+	if (neigh_node)
+		batadv_neigh_node_free_ref(neigh_node);
+	return ret;
+}
diff --git a/net/batman-adv/fragmentation.h b/net/batman-adv/fragmentation.h
new file mode 100644
index 0000000..883a6f4
--- /dev/null
+++ b/net/batman-adv/fragmentation.h
@@ -0,0 +1,47 @@
+/* Copyright (C) 2013 B.A.T.M.A.N. contributors:
+ *
+ * Martin Hundebøll <martin@hundeboll.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef _NET_BATMAN_ADV_FRAGMENTATION_H_
+#define _NET_BATMAN_ADV_FRAGMENTATION_H_
+
+void batadv_frag_purge_orig(struct batadv_orig_node *orig,
+			    bool (*check_cb)(struct batadv_frag_table_entry *));
+bool batadv_frag_skb_fwd(struct sk_buff *skb,
+			 struct batadv_hard_iface *recv_if,
+			 struct batadv_orig_node *orig_node_src);
+bool batadv_frag_skb_buffer(struct sk_buff **skb,
+			    struct batadv_orig_node *orig_node);
+
+/**
+ * batadv_frag_check_entry - check if a list of fragments has timed out
+ * @frags_entry: table entry to check
+ *
+ * Returns true if the frags entry has timed out, false otherwise.
+ */
+static inline bool
+batadv_frag_check_entry(struct batadv_frag_table_entry *frags_entry)
+{
+	if (!hlist_empty(&frags_entry->head) &&
+	    batadv_has_timed_out(frags_entry->timestamp, BATADV_FRAG_TIMEOUT))
+		return true;
+	else
+		return false;
+}
+
+#endif /* _NET_BATMAN_ADV_FRAGMENTATION_H_ */
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 8822fad..ca6f134 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -40,6 +40,7 @@
 #include "hash.h"
 #include "bat_algo.h"
 #include "network-coding.h"
+#include "fragmentation.h"
 
 
 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
@@ -399,6 +400,7 @@ static void batadv_recv_handler_init(void)
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_frag_packet, dest) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4);
 
@@ -414,6 +416,8 @@ static void batadv_recv_handler_init(void)
 	batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
 	/* batman icmp packet */
 	batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
+	/* Fragmented packets */
+	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
 }
 
 int
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index e11c2ec..6a74a42 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -131,6 +131,15 @@ enum batadv_uev_type {
 
 #define BATADV_GW_THRESHOLD	50
 
+/* Number of fragment chains for each orig_node */
+#define BATADV_FRAG_BUFFER_COUNT 8
+/* Maximum number of fragments for one packet */
+#define BATADV_FRAG_MAX_FRAGMENTS 16
+/* Maxumim size of each fragment */
+#define BATADV_FRAG_MAX_FRAG_SIZE 1400
+/* Time to keep fragments while waiting for rest of the fragments */
+#define BATADV_FRAG_TIMEOUT 10000
+
 #define BATADV_DAT_CANDIDATE_NOT_FOUND	0
 #define BATADV_DAT_CANDIDATE_ORIG	1
 
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 898b0ce..a591dc5 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -28,6 +28,7 @@
 #include "soft-interface.h"
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
+#include "fragmentation.h"
 
 /* hash class keys */
 static struct lock_class_key batadv_orig_hash_lock_class_key;
@@ -145,6 +146,8 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 	/* Free nc_nodes */
 	batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 
+	batadv_frag_purge_orig(orig_node, NULL);
+
 	batadv_tt_global_del_orig(orig_node->bat_priv, orig_node,
 				  "originator timed out");
 
@@ -215,7 +218,7 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 					      const uint8_t *addr)
 {
 	struct batadv_orig_node *orig_node;
-	int size;
+	int size, i;
 	int hash_added;
 	unsigned long reset_time;
 
@@ -267,6 +270,12 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 	size = bat_priv->num_ifaces * sizeof(uint8_t);
 	orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 
+	for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
+		INIT_HLIST_HEAD(&orig_node->fragments[i].head);
+		spin_lock_init(&orig_node->fragments[i].lock);
+		orig_node->fragments[i].size = 0;
+	}
+
 	if (!orig_node->bcast_own_sum)
 		goto free_bcast_own;
 
@@ -388,6 +397,9 @@ static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 				batadv_orig_node_free_ref(orig_node);
 				continue;
 			}
+
+			batadv_frag_purge_orig(orig_node,
+					       batadv_frag_check_entry);
 		}
 		spin_unlock_bh(list_lock);
 	}
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index 5e3b102..aa46c27 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -249,6 +249,33 @@ struct batadv_unicast_4addr_packet {
 	 */
 };
 
+/**
+ * struct batadv_frag_packet - fragmented packet
+ * @header: common batman packet header with type, compatversion, and ttl
+ * @dest: final destination used when routing fragments
+ * @orig: originator of the fragment used when merging the packet
+ * @no: fragment number within this sequence
+ * @reserved: reserved byte for alignment
+ * @seqno: sequence identification
+ * @total_size: size of the merged packet
+ */
+struct batadv_frag_packet {
+	struct  batadv_header header;
+#if defined(__BIG_ENDIAN_BITFIELD)
+	uint8_t no:4;
+	uint8_t reserved:4;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	uint8_t reserved:4;
+	uint8_t no:4;
+#else
+#error "unknown bitfield endianess"
+#endif
+	uint8_t dest[ETH_ALEN];
+	uint8_t orig[ETH_ALEN];
+	__be16  seqno;
+	__be16  total_size;
+};
+
 struct batadv_bcast_packet {
 	struct batadv_header header;
 	uint8_t  reserved;
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index fd2cdbc..a080f63 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -28,6 +28,7 @@
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
 #include "network-coding.h"
+#include "fragmentation.h"
 
 static int batadv_route_unicast_packet(struct sk_buff *skb,
 				       struct batadv_hard_iface *recv_if);
@@ -1013,6 +1014,64 @@ int batadv_recv_unicast_tvlv(struct sk_buff *skb,
 	return ret;
 }
 
+/**
+ * batadv_recv_frag_packet - process received fragment
+ * @skb: the received fragment
+ * @recv_if: interface that the skb is received on
+ *
+ * This function does one of the three following things: 1) Forward fragment, if
+ * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
+ * lack further fragments; 3) Merge fragments, if we have all needed parts.
+ *
+ * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
+ */
+int batadv_recv_frag_packet(struct sk_buff *skb,
+			    struct batadv_hard_iface *recv_if)
+{
+	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct batadv_orig_node *orig_node_src = NULL;
+	struct batadv_frag_packet *frag_packet;
+	int ret = NET_RX_DROP;
+
+	if (batadv_check_unicast_packet(bat_priv, skb,
+					sizeof(*frag_packet)) < 0)
+		goto out;
+
+	frag_packet = (struct batadv_frag_packet *)skb->data;
+	orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig);
+	if (!orig_node_src)
+		goto out;
+
+	/* Route the fragment if it is not for us and too big to be merged. */
+	if (!batadv_is_my_mac(bat_priv, frag_packet->dest) &&
+	    batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) {
+		ret = NET_RX_SUCCESS;
+		goto out;
+	}
+
+	batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX);
+	batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len);
+
+	/* Add fragment to buffer and merge if possible. */
+	if (!batadv_frag_skb_buffer(&skb, orig_node_src))
+		goto out;
+
+	/* Deliver merged packet to the appropriate handler, if it was
+	 * merged
+	 */
+	if (skb)
+		batadv_batman_skb_recv(skb, recv_if->net_dev,
+				       &recv_if->batman_adv_ptype, NULL);
+
+	ret = NET_RX_SUCCESS;
+
+out:
+	if (orig_node_src)
+		batadv_orig_node_free_ref(orig_node_src);
+
+	return ret;
+}
+
 int batadv_recv_bcast_packet(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if)
 {
diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h
index efab583..55d637a 100644
--- a/net/batman-adv/routing.h
+++ b/net/batman-adv/routing.h
@@ -30,6 +30,8 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 			    struct batadv_hard_iface *recv_if);
 int batadv_recv_unicast_packet(struct sk_buff *skb,
 			       struct batadv_hard_iface *recv_if);
+int batadv_recv_frag_packet(struct sk_buff *skb,
+			    struct batadv_hard_iface *iface);
 int batadv_recv_bcast_packet(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if);
 int batadv_recv_tt_query(struct sk_buff *skb,
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 504d0bb..dd189e6 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -758,6 +758,10 @@ static const struct {
 	{ "mgmt_tx_bytes" },
 	{ "mgmt_rx" },
 	{ "mgmt_rx_bytes" },
+	{ "frag_rx" },
+	{ "frag_rx_bytes" },
+	{ "frag_fwd" },
+	{ "frag_fwd_bytes" },
 	{ "tt_request_tx" },
 	{ "tt_request_rx" },
 	{ "tt_response_tx" },
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 795a079..5a2cc7a 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -86,6 +86,34 @@ struct batadv_hard_iface {
 };
 
 /**
+ * struct batadv_frag_table_entry - head in the fragment buffer table
+ * @head: head of list with fragments
+ * @lock: lock to protect the list of fragments
+ * @timestamp: time (jiffie) of last received fragment
+ * @seqno: sequence number of the fragments in the list
+ * @size: accumulated size of packets in list
+ */
+struct batadv_frag_table_entry {
+	struct hlist_head head;
+	spinlock_t lock; /* protects head */
+	unsigned long timestamp;
+	uint16_t seqno;
+	uint16_t size;
+};
+
+/**
+ * struct batadv_frag_list_entry - entry in a list of fragments
+ * @list: list node information
+ * @skb: fragment
+ * @no: fragment number in the set
+ */
+struct batadv_frag_list_entry {
+	struct hlist_node list;
+	struct sk_buff *skb;
+	uint8_t no;
+};
+
+/**
  * struct batadv_orig_node - structure for orig_list maintaining nodes of mesh
  * @orig: originator ethernet address
  * @primary_addr: hosts primary interface address
@@ -128,6 +156,7 @@ struct batadv_hard_iface {
  * @out_coding_list: list of nodes that can hear this orig
  * @in_coding_list_lock: protects in_coding_list
  * @out_coding_list_lock: protects out_coding_list
+ * @fragments: array with heads for fragment chains
  */
 struct batadv_orig_node {
 	uint8_t orig[ETH_ALEN];
@@ -174,6 +203,7 @@ struct batadv_orig_node {
 	spinlock_t in_coding_list_lock; /* Protects in_coding_list */
 	spinlock_t out_coding_list_lock; /* Protects out_coding_list */
 #endif
+	struct batadv_frag_table_entry fragments[BATADV_FRAG_BUFFER_COUNT];
 };
 
 /**
@@ -270,6 +300,10 @@ struct batadv_bcast_duplist_entry {
  * @BATADV_CNT_MGMT_TX_BYTES: transmitted routing protocol traffic bytes counter
  * @BATADV_CNT_MGMT_RX: received routing protocol traffic packet counter
  * @BATADV_CNT_MGMT_RX_BYTES: received routing protocol traffic bytes counter
+ * @BATADV_CNT_FRAG_RX: received fragment traffic packet counter
+ * @BATADV_CNT_FRAG_RX_BYTES: received fragment traffic bytes counter
+ * @BATADV_CNT_FRAG_FWD: forwarded fragment traffic packet counter
+ * @BATADV_CNT_FRAG_FWD_BYTES: forwarded fragment traffic bytes counter
  * @BATADV_CNT_TT_REQUEST_TX: transmitted tt req traffic packet counter
  * @BATADV_CNT_TT_REQUEST_RX: received tt req traffic packet counter
  * @BATADV_CNT_TT_RESPONSE_TX: transmitted tt resp traffic packet counter
@@ -307,6 +341,10 @@ enum batadv_counters {
 	BATADV_CNT_MGMT_TX_BYTES,
 	BATADV_CNT_MGMT_RX,
 	BATADV_CNT_MGMT_RX_BYTES,
+	BATADV_CNT_FRAG_RX,
+	BATADV_CNT_FRAG_RX_BYTES,
+	BATADV_CNT_FRAG_FWD,
+	BATADV_CNT_FRAG_FWD_BYTES,
 	BATADV_CNT_TT_REQUEST_TX,
 	BATADV_CNT_TT_REQUEST_RX,
 	BATADV_CNT_TT_RESPONSE_TX,
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 08/16] batman-adv: Receive fragmented packets and merge
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, Martin Hundebøll, b.a.t.m.a.n, Marek Lindner,
	Antonio Quartulli

From: Martin Hundebøll <martin@hundeboll.net>

Fragments arriving at their destination are buffered for later merge.
Merged packets are passed to the main receive function as had they never
been fragmented.

Fragments are forwarded without merging if the MTU of the outgoing
interface is smaller than the size of the merged packet.

Signed-off-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/Makefile         |   1 +
 net/batman-adv/fragmentation.c  | 370 ++++++++++++++++++++++++++++++++++++++++
 net/batman-adv/fragmentation.h  |  47 +++++
 net/batman-adv/main.c           |   4 +
 net/batman-adv/main.h           |   9 +
 net/batman-adv/originator.c     |  14 +-
 net/batman-adv/packet.h         |  27 +++
 net/batman-adv/routing.c        |  59 +++++++
 net/batman-adv/routing.h        |   2 +
 net/batman-adv/soft-interface.c |   4 +
 net/batman-adv/types.h          |  38 +++++
 11 files changed, 574 insertions(+), 1 deletion(-)
 create mode 100644 net/batman-adv/fragmentation.c
 create mode 100644 net/batman-adv/fragmentation.h

diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile
index f9b465b..4f4aabb 100644
--- a/net/batman-adv/Makefile
+++ b/net/batman-adv/Makefile
@@ -24,6 +24,7 @@ batman-adv-y += bitarray.o
 batman-adv-$(CONFIG_BATMAN_ADV_BLA) += bridge_loop_avoidance.o
 batman-adv-y += debugfs.o
 batman-adv-$(CONFIG_BATMAN_ADV_DAT) += distributed-arp-table.o
+batman-adv-y += fragmentation.o
 batman-adv-y += gateway_client.o
 batman-adv-y += gateway_common.o
 batman-adv-y += hard-interface.o
diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
new file mode 100644
index 0000000..c829d3c
--- /dev/null
+++ b/net/batman-adv/fragmentation.c
@@ -0,0 +1,370 @@
+/* Copyright (C) 2013 B.A.T.M.A.N. contributors:
+ *
+ * Martin Hundebøll <martin@hundeboll.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include "main.h"
+#include "fragmentation.h"
+#include "send.h"
+#include "originator.h"
+#include "routing.h"
+#include "hard-interface.h"
+#include "soft-interface.h"
+
+
+/**
+ * batadv_frag_clear_chain - delete entries in the fragment buffer chain
+ * @head: head of chain with entries.
+ *
+ * Free fragments in the passed hlist. Should be called with appropriate lock.
+ */
+static void batadv_frag_clear_chain(struct hlist_head *head)
+{
+	struct batadv_frag_list_entry *entry;
+	struct hlist_node *node;
+
+	hlist_for_each_entry_safe(entry, node, head, list) {
+		hlist_del(&entry->list);
+		kfree_skb(entry->skb);
+		kfree(entry);
+	}
+}
+
+/**
+ * batadv_frag_purge_orig - free fragments associated to an orig
+ * @orig_node: originator to free fragments from
+ * @check_cb: optional function to tell if an entry should be purged
+ */
+void batadv_frag_purge_orig(struct batadv_orig_node *orig_node,
+			    bool (*check_cb)(struct batadv_frag_table_entry *))
+{
+	struct batadv_frag_table_entry *chain;
+	uint8_t i;
+
+	for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
+		chain = &orig_node->fragments[i];
+		spin_lock_bh(&orig_node->fragments[i].lock);
+
+		if (!check_cb || check_cb(chain)) {
+			batadv_frag_clear_chain(&orig_node->fragments[i].head);
+			orig_node->fragments[i].size = 0;
+		}
+
+		spin_unlock_bh(&orig_node->fragments[i].lock);
+	}
+}
+
+/**
+ * batadv_frag_size_limit - maximum possible size of packet to be fragmented
+ *
+ * Returns the maximum size of payload that can be fragmented.
+ */
+static int batadv_frag_size_limit(void)
+{
+	int limit = BATADV_FRAG_MAX_FRAG_SIZE;
+
+	limit -= sizeof(struct batadv_frag_packet);
+	limit *= BATADV_FRAG_MAX_FRAGMENTS;
+
+	return limit;
+}
+
+/**
+ * batadv_frag_init_chain - check and prepare fragment chain for new fragment
+ * @chain: chain in fragments table to init
+ * @seqno: sequence number of the received fragment
+ *
+ * Make chain ready for a fragment with sequence number "seqno". Delete existing
+ * entries if they have an "old" sequence number.
+ *
+ * Caller must hold chain->lock.
+ *
+ * Returns true if chain is empty and caller can just insert the new fragment
+ * without searching for the right position.
+ */
+static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain,
+				   uint16_t seqno)
+{
+	if (chain->seqno == seqno)
+		return false;
+
+	if (!hlist_empty(&chain->head))
+		batadv_frag_clear_chain(&chain->head);
+
+	chain->size = 0;
+	chain->seqno = seqno;
+
+	return true;
+}
+
+/**
+ * batadv_frag_insert_packet - insert a fragment into a fragment chain
+ * @orig_node: originator that the fragment was received from
+ * @skb: skb to insert
+ * @chain_out: list head to attach complete chains of fragments to
+ *
+ * Insert a new fragment into the reverse ordered chain in the right table
+ * entry. The hash table entry is cleared if "old" fragments exist in it.
+ *
+ * Returns true if skb is buffered, false on error. If the chain has all the
+ * fragments needed to merge the packet, the chain is moved to the passed head
+ * to avoid locking the chain in the table.
+ */
+static bool batadv_frag_insert_packet(struct batadv_orig_node *orig_node,
+				      struct sk_buff *skb,
+				      struct hlist_head *chain_out)
+{
+	struct batadv_frag_table_entry *chain;
+	struct batadv_frag_list_entry *frag_entry_new = NULL, *frag_entry_curr;
+	struct batadv_frag_packet *frag_packet;
+	uint8_t bucket;
+	uint16_t seqno, hdr_size = sizeof(struct batadv_frag_packet);
+	bool ret = false;
+
+	/* Linearize packet to avoid linearizing 16 packets in a row when doing
+	 * the later merge. Non-linear merge should be added to remove this
+	 * linearization.
+	 */
+	if (skb_linearize(skb) < 0)
+		goto err;
+
+	frag_packet = (struct batadv_frag_packet *)skb->data;
+	seqno = ntohs(frag_packet->seqno);
+	bucket = seqno % BATADV_FRAG_BUFFER_COUNT;
+
+	frag_entry_new = kmalloc(sizeof(*frag_entry_new), GFP_ATOMIC);
+	if (!frag_entry_new)
+		goto err;
+
+	frag_entry_new->skb = skb;
+	frag_entry_new->no = frag_packet->no;
+
+	/* Select entry in the "chain table" and delete any prior fragments
+	 * with another sequence number. batadv_frag_init_chain() returns true,
+	 * if the list is empty at return.
+	 */
+	chain = &orig_node->fragments[bucket];
+	spin_lock_bh(&chain->lock);
+	if (batadv_frag_init_chain(chain, seqno)) {
+		hlist_add_head(&frag_entry_new->list, &chain->head);
+		chain->size = skb->len - hdr_size;
+		chain->timestamp = jiffies;
+		ret = true;
+		goto out;
+	}
+
+	/* Find the position for the new fragment. */
+	hlist_for_each_entry(frag_entry_curr, &chain->head, list) {
+		/* Drop packet if fragment already exists. */
+		if (frag_entry_curr->no == frag_entry_new->no)
+			goto err_unlock;
+
+		/* Order fragments from highest to lowest. */
+		if (frag_entry_curr->no < frag_entry_new->no) {
+			hlist_add_before(&frag_entry_new->list,
+					 &frag_entry_curr->list);
+			chain->size += skb->len - hdr_size;
+			chain->timestamp = jiffies;
+			ret = true;
+			goto out;
+		}
+	}
+
+	/* Reached the end of the list, so insert after 'frag_entry_curr'. */
+	if (likely(frag_entry_curr)) {
+		hlist_add_after(&frag_entry_curr->list, &frag_entry_new->list);
+		chain->size += skb->len - hdr_size;
+		chain->timestamp = jiffies;
+		ret = true;
+	}
+
+out:
+	if (chain->size > batadv_frag_size_limit() ||
+	    ntohs(frag_packet->total_size) > batadv_frag_size_limit()) {
+		/* Clear chain if total size of either the list or the packet
+		 * exceeds the maximum size of one merged packet.
+		 */
+		batadv_frag_clear_chain(&chain->head);
+		chain->size = 0;
+	} else if (ntohs(frag_packet->total_size) == chain->size) {
+		/* All fragments received. Hand over chain to caller. */
+		hlist_move_list(&chain->head, chain_out);
+		chain->size = 0;
+	}
+
+err_unlock:
+	spin_unlock_bh(&chain->lock);
+
+err:
+	if (!ret)
+		kfree(frag_entry_new);
+
+	return ret;
+}
+
+/**
+ * batadv_frag_merge_packets - merge a chain of fragments
+ * @chain: head of chain with fragments
+ * @skb: packet with total size of skb after merging
+ *
+ * Expand the first skb in the chain and copy the content of the remaining
+ * skb's into the expanded one. After doing so, clear the chain.
+ *
+ * Returns the merged skb or NULL on error.
+ */
+static struct sk_buff *
+batadv_frag_merge_packets(struct hlist_head *chain, struct sk_buff *skb)
+{
+	struct batadv_frag_packet *packet;
+	struct batadv_frag_list_entry *entry;
+	struct sk_buff *skb_out = NULL;
+	int size, hdr_size = sizeof(struct batadv_frag_packet);
+
+	/* Make sure incoming skb has non-bogus data. */
+	packet = (struct batadv_frag_packet *)skb->data;
+	size = ntohs(packet->total_size);
+	if (size > batadv_frag_size_limit())
+		goto free;
+
+	/* Remove first entry, as this is the destination for the rest of the
+	 * fragments.
+	 */
+	entry = hlist_entry(chain->first, struct batadv_frag_list_entry, list);
+	hlist_del(&entry->list);
+	skb_out = entry->skb;
+	kfree(entry);
+
+	/* Make room for the rest of the fragments. */
+	if (pskb_expand_head(skb_out, 0, size - skb->len, GFP_ATOMIC) < 0) {
+		kfree_skb(skb_out);
+		skb_out = NULL;
+		goto free;
+	}
+
+	/* Move the existing MAC header to just before the payload. (Override
+	 * the fragment header.)
+	 */
+	skb_pull_rcsum(skb_out, hdr_size);
+	memmove(skb_out->data - ETH_HLEN, skb_mac_header(skb_out), ETH_HLEN);
+	skb_set_mac_header(skb_out, -ETH_HLEN);
+	skb_reset_network_header(skb_out);
+	skb_reset_transport_header(skb_out);
+
+	/* Copy the payload of the each fragment into the last skb */
+	hlist_for_each_entry(entry, chain, list) {
+		size = entry->skb->len - hdr_size;
+		memcpy(skb_put(skb_out, size), entry->skb->data + hdr_size,
+		       size);
+	}
+
+free:
+	/* Locking is not needed, because 'chain' is not part of any orig. */
+	batadv_frag_clear_chain(chain);
+	return skb_out;
+}
+
+/**
+ * batadv_frag_skb_buffer - buffer fragment for later merge
+ * @skb: skb to buffer
+ * @orig_node_src: originator that the skb is received from
+ *
+ * Add fragment to buffer and merge fragments if possible.
+ *
+ * There are three possible outcomes: 1) Packet is merged: Return true and
+ * set *skb to merged packet; 2) Packet is buffered: Return true and set *skb
+ * to NULL; 3) Error: Return false and leave skb as is.
+ */
+bool batadv_frag_skb_buffer(struct sk_buff **skb,
+			    struct batadv_orig_node *orig_node_src)
+{
+	struct sk_buff *skb_out = NULL;
+	struct hlist_head head = HLIST_HEAD_INIT;
+	bool ret = false;
+
+	/* Add packet to buffer and table entry if merge is possible. */
+	if (!batadv_frag_insert_packet(orig_node_src, *skb, &head))
+		goto out_err;
+
+	/* Leave if more fragments are needed to merge. */
+	if (hlist_empty(&head))
+		goto out;
+
+	skb_out = batadv_frag_merge_packets(&head, *skb);
+	if (!skb_out)
+		goto out_err;
+
+out:
+	*skb = skb_out;
+	ret = true;
+out_err:
+	return ret;
+}
+
+/**
+ * batadv_frag_skb_fwd - forward fragments that would exceed MTU when merged
+ * @skb: skb to forward
+ * @recv_if: interface that the skb is received on
+ * @orig_node_src: originator that the skb is received from
+ *
+ * Look up the next-hop of the fragments payload and check if the merged packet
+ * will exceed the MTU towards the next-hop. If so, the fragment is forwarded
+ * without merging it.
+ *
+ * Returns true if the fragment is consumed/forwarded, false otherwise.
+ */
+bool batadv_frag_skb_fwd(struct sk_buff *skb,
+			 struct batadv_hard_iface *recv_if,
+			 struct batadv_orig_node *orig_node_src)
+{
+	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct batadv_orig_node *orig_node_dst = NULL;
+	struct batadv_neigh_node *neigh_node = NULL;
+	struct batadv_frag_packet *packet;
+	uint16_t total_size;
+	bool ret = false;
+
+	packet = (struct batadv_frag_packet *)skb->data;
+	orig_node_dst = batadv_orig_hash_find(bat_priv, packet->dest);
+	if (!orig_node_dst)
+		goto out;
+
+	neigh_node = batadv_find_router(bat_priv, orig_node_dst, recv_if);
+	if (!neigh_node)
+		goto out;
+
+	/* Forward the fragment, if the merged packet would be too big to
+	 * be assembled.
+	 */
+	total_size = ntohs(packet->total_size);
+	if (total_size > neigh_node->if_incoming->net_dev->mtu) {
+		batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_FWD);
+		batadv_add_counter(bat_priv, BATADV_CNT_FRAG_FWD_BYTES,
+				   skb->len + ETH_HLEN);
+
+		packet->header.ttl--;
+		batadv_send_skb_packet(skb, neigh_node->if_incoming,
+				       neigh_node->addr);
+		ret = true;
+	}
+
+out:
+	if (orig_node_dst)
+		batadv_orig_node_free_ref(orig_node_dst);
+	if (neigh_node)
+		batadv_neigh_node_free_ref(neigh_node);
+	return ret;
+}
diff --git a/net/batman-adv/fragmentation.h b/net/batman-adv/fragmentation.h
new file mode 100644
index 0000000..883a6f4
--- /dev/null
+++ b/net/batman-adv/fragmentation.h
@@ -0,0 +1,47 @@
+/* Copyright (C) 2013 B.A.T.M.A.N. contributors:
+ *
+ * Martin Hundebøll <martin@hundeboll.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#ifndef _NET_BATMAN_ADV_FRAGMENTATION_H_
+#define _NET_BATMAN_ADV_FRAGMENTATION_H_
+
+void batadv_frag_purge_orig(struct batadv_orig_node *orig,
+			    bool (*check_cb)(struct batadv_frag_table_entry *));
+bool batadv_frag_skb_fwd(struct sk_buff *skb,
+			 struct batadv_hard_iface *recv_if,
+			 struct batadv_orig_node *orig_node_src);
+bool batadv_frag_skb_buffer(struct sk_buff **skb,
+			    struct batadv_orig_node *orig_node);
+
+/**
+ * batadv_frag_check_entry - check if a list of fragments has timed out
+ * @frags_entry: table entry to check
+ *
+ * Returns true if the frags entry has timed out, false otherwise.
+ */
+static inline bool
+batadv_frag_check_entry(struct batadv_frag_table_entry *frags_entry)
+{
+	if (!hlist_empty(&frags_entry->head) &&
+	    batadv_has_timed_out(frags_entry->timestamp, BATADV_FRAG_TIMEOUT))
+		return true;
+	else
+		return false;
+}
+
+#endif /* _NET_BATMAN_ADV_FRAGMENTATION_H_ */
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 8822fad..ca6f134 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -40,6 +40,7 @@
 #include "hash.h"
 #include "bat_algo.h"
 #include "network-coding.h"
+#include "fragmentation.h"
 
 
 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
@@ -399,6 +400,7 @@ static void batadv_recv_handler_init(void)
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_4addr_packet, src) != 10);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_frag_packet, dest) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4);
 
@@ -414,6 +416,8 @@ static void batadv_recv_handler_init(void)
 	batadv_rx_handler[BATADV_UNICAST_TVLV] = batadv_recv_unicast_tvlv;
 	/* batman icmp packet */
 	batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
+	/* Fragmented packets */
+	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_frag_packet;
 }
 
 int
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index e11c2ec..6a74a42 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -131,6 +131,15 @@ enum batadv_uev_type {
 
 #define BATADV_GW_THRESHOLD	50
 
+/* Number of fragment chains for each orig_node */
+#define BATADV_FRAG_BUFFER_COUNT 8
+/* Maximum number of fragments for one packet */
+#define BATADV_FRAG_MAX_FRAGMENTS 16
+/* Maxumim size of each fragment */
+#define BATADV_FRAG_MAX_FRAG_SIZE 1400
+/* Time to keep fragments while waiting for rest of the fragments */
+#define BATADV_FRAG_TIMEOUT 10000
+
 #define BATADV_DAT_CANDIDATE_NOT_FOUND	0
 #define BATADV_DAT_CANDIDATE_ORIG	1
 
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 898b0ce..a591dc5 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -28,6 +28,7 @@
 #include "soft-interface.h"
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
+#include "fragmentation.h"
 
 /* hash class keys */
 static struct lock_class_key batadv_orig_hash_lock_class_key;
@@ -145,6 +146,8 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 	/* Free nc_nodes */
 	batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 
+	batadv_frag_purge_orig(orig_node, NULL);
+
 	batadv_tt_global_del_orig(orig_node->bat_priv, orig_node,
 				  "originator timed out");
 
@@ -215,7 +218,7 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 					      const uint8_t *addr)
 {
 	struct batadv_orig_node *orig_node;
-	int size;
+	int size, i;
 	int hash_added;
 	unsigned long reset_time;
 
@@ -267,6 +270,12 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
 	size = bat_priv->num_ifaces * sizeof(uint8_t);
 	orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC);
 
+	for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
+		INIT_HLIST_HEAD(&orig_node->fragments[i].head);
+		spin_lock_init(&orig_node->fragments[i].lock);
+		orig_node->fragments[i].size = 0;
+	}
+
 	if (!orig_node->bcast_own_sum)
 		goto free_bcast_own;
 
@@ -388,6 +397,9 @@ static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 				batadv_orig_node_free_ref(orig_node);
 				continue;
 			}
+
+			batadv_frag_purge_orig(orig_node,
+					       batadv_frag_check_entry);
 		}
 		spin_unlock_bh(list_lock);
 	}
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index 5e3b102..aa46c27 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -249,6 +249,33 @@ struct batadv_unicast_4addr_packet {
 	 */
 };
 
+/**
+ * struct batadv_frag_packet - fragmented packet
+ * @header: common batman packet header with type, compatversion, and ttl
+ * @dest: final destination used when routing fragments
+ * @orig: originator of the fragment used when merging the packet
+ * @no: fragment number within this sequence
+ * @reserved: reserved byte for alignment
+ * @seqno: sequence identification
+ * @total_size: size of the merged packet
+ */
+struct batadv_frag_packet {
+	struct  batadv_header header;
+#if defined(__BIG_ENDIAN_BITFIELD)
+	uint8_t no:4;
+	uint8_t reserved:4;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+	uint8_t reserved:4;
+	uint8_t no:4;
+#else
+#error "unknown bitfield endianess"
+#endif
+	uint8_t dest[ETH_ALEN];
+	uint8_t orig[ETH_ALEN];
+	__be16  seqno;
+	__be16  total_size;
+};
+
 struct batadv_bcast_packet {
 	struct batadv_header header;
 	uint8_t  reserved;
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index fd2cdbc..a080f63 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -28,6 +28,7 @@
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
 #include "network-coding.h"
+#include "fragmentation.h"
 
 static int batadv_route_unicast_packet(struct sk_buff *skb,
 				       struct batadv_hard_iface *recv_if);
@@ -1013,6 +1014,64 @@ int batadv_recv_unicast_tvlv(struct sk_buff *skb,
 	return ret;
 }
 
+/**
+ * batadv_recv_frag_packet - process received fragment
+ * @skb: the received fragment
+ * @recv_if: interface that the skb is received on
+ *
+ * This function does one of the three following things: 1) Forward fragment, if
+ * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till
+ * lack further fragments; 3) Merge fragments, if we have all needed parts.
+ *
+ * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
+ */
+int batadv_recv_frag_packet(struct sk_buff *skb,
+			    struct batadv_hard_iface *recv_if)
+{
+	struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct batadv_orig_node *orig_node_src = NULL;
+	struct batadv_frag_packet *frag_packet;
+	int ret = NET_RX_DROP;
+
+	if (batadv_check_unicast_packet(bat_priv, skb,
+					sizeof(*frag_packet)) < 0)
+		goto out;
+
+	frag_packet = (struct batadv_frag_packet *)skb->data;
+	orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig);
+	if (!orig_node_src)
+		goto out;
+
+	/* Route the fragment if it is not for us and too big to be merged. */
+	if (!batadv_is_my_mac(bat_priv, frag_packet->dest) &&
+	    batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) {
+		ret = NET_RX_SUCCESS;
+		goto out;
+	}
+
+	batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX);
+	batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len);
+
+	/* Add fragment to buffer and merge if possible. */
+	if (!batadv_frag_skb_buffer(&skb, orig_node_src))
+		goto out;
+
+	/* Deliver merged packet to the appropriate handler, if it was
+	 * merged
+	 */
+	if (skb)
+		batadv_batman_skb_recv(skb, recv_if->net_dev,
+				       &recv_if->batman_adv_ptype, NULL);
+
+	ret = NET_RX_SUCCESS;
+
+out:
+	if (orig_node_src)
+		batadv_orig_node_free_ref(orig_node_src);
+
+	return ret;
+}
+
 int batadv_recv_bcast_packet(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if)
 {
diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h
index efab583..55d637a 100644
--- a/net/batman-adv/routing.h
+++ b/net/batman-adv/routing.h
@@ -30,6 +30,8 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 			    struct batadv_hard_iface *recv_if);
 int batadv_recv_unicast_packet(struct sk_buff *skb,
 			       struct batadv_hard_iface *recv_if);
+int batadv_recv_frag_packet(struct sk_buff *skb,
+			    struct batadv_hard_iface *iface);
 int batadv_recv_bcast_packet(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if);
 int batadv_recv_tt_query(struct sk_buff *skb,
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 504d0bb..dd189e6 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -758,6 +758,10 @@ static const struct {
 	{ "mgmt_tx_bytes" },
 	{ "mgmt_rx" },
 	{ "mgmt_rx_bytes" },
+	{ "frag_rx" },
+	{ "frag_rx_bytes" },
+	{ "frag_fwd" },
+	{ "frag_fwd_bytes" },
 	{ "tt_request_tx" },
 	{ "tt_request_rx" },
 	{ "tt_response_tx" },
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 795a079..5a2cc7a 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -86,6 +86,34 @@ struct batadv_hard_iface {
 };
 
 /**
+ * struct batadv_frag_table_entry - head in the fragment buffer table
+ * @head: head of list with fragments
+ * @lock: lock to protect the list of fragments
+ * @timestamp: time (jiffie) of last received fragment
+ * @seqno: sequence number of the fragments in the list
+ * @size: accumulated size of packets in list
+ */
+struct batadv_frag_table_entry {
+	struct hlist_head head;
+	spinlock_t lock; /* protects head */
+	unsigned long timestamp;
+	uint16_t seqno;
+	uint16_t size;
+};
+
+/**
+ * struct batadv_frag_list_entry - entry in a list of fragments
+ * @list: list node information
+ * @skb: fragment
+ * @no: fragment number in the set
+ */
+struct batadv_frag_list_entry {
+	struct hlist_node list;
+	struct sk_buff *skb;
+	uint8_t no;
+};
+
+/**
  * struct batadv_orig_node - structure for orig_list maintaining nodes of mesh
  * @orig: originator ethernet address
  * @primary_addr: hosts primary interface address
@@ -128,6 +156,7 @@ struct batadv_hard_iface {
  * @out_coding_list: list of nodes that can hear this orig
  * @in_coding_list_lock: protects in_coding_list
  * @out_coding_list_lock: protects out_coding_list
+ * @fragments: array with heads for fragment chains
  */
 struct batadv_orig_node {
 	uint8_t orig[ETH_ALEN];
@@ -174,6 +203,7 @@ struct batadv_orig_node {
 	spinlock_t in_coding_list_lock; /* Protects in_coding_list */
 	spinlock_t out_coding_list_lock; /* Protects out_coding_list */
 #endif
+	struct batadv_frag_table_entry fragments[BATADV_FRAG_BUFFER_COUNT];
 };
 
 /**
@@ -270,6 +300,10 @@ struct batadv_bcast_duplist_entry {
  * @BATADV_CNT_MGMT_TX_BYTES: transmitted routing protocol traffic bytes counter
  * @BATADV_CNT_MGMT_RX: received routing protocol traffic packet counter
  * @BATADV_CNT_MGMT_RX_BYTES: received routing protocol traffic bytes counter
+ * @BATADV_CNT_FRAG_RX: received fragment traffic packet counter
+ * @BATADV_CNT_FRAG_RX_BYTES: received fragment traffic bytes counter
+ * @BATADV_CNT_FRAG_FWD: forwarded fragment traffic packet counter
+ * @BATADV_CNT_FRAG_FWD_BYTES: forwarded fragment traffic bytes counter
  * @BATADV_CNT_TT_REQUEST_TX: transmitted tt req traffic packet counter
  * @BATADV_CNT_TT_REQUEST_RX: received tt req traffic packet counter
  * @BATADV_CNT_TT_RESPONSE_TX: transmitted tt resp traffic packet counter
@@ -307,6 +341,10 @@ enum batadv_counters {
 	BATADV_CNT_MGMT_TX_BYTES,
 	BATADV_CNT_MGMT_RX,
 	BATADV_CNT_MGMT_RX_BYTES,
+	BATADV_CNT_FRAG_RX,
+	BATADV_CNT_FRAG_RX_BYTES,
+	BATADV_CNT_FRAG_FWD,
+	BATADV_CNT_FRAG_FWD_BYTES,
 	BATADV_CNT_TT_REQUEST_TX,
 	BATADV_CNT_TT_REQUEST_RX,
 	BATADV_CNT_TT_RESPONSE_TX,
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 09/16] batman-adv: Fragment and send skbs larger than mtu
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, b.a.t.m.a.n, Martin Hundebøll, Marek Lindner,
	Antonio Quartulli

From: Martin Hundebøll <martin@hundeboll.net>

Non-broadcast packets larger than MTU are fragmented and sent with
an encapsulating header. Up to 16 fragments are supported, which are
sent in reverse order on the wire to allow minimal memory copying when
creating fragments.

Signed-off-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/fragmentation.c  | 121 ++++++++++++++++++++++++++++++++++++++++
 net/batman-adv/fragmentation.h  |   3 +
 net/batman-adv/send.c           |  21 +++++--
 net/batman-adv/soft-interface.c |   7 +++
 net/batman-adv/types.h          |   6 ++
 5 files changed, 154 insertions(+), 4 deletions(-)

diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index c829d3c..271d321 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -368,3 +368,124 @@ out:
 		batadv_neigh_node_free_ref(neigh_node);
 	return ret;
 }
+
+/**
+ * batadv_frag_create - create a fragment from skb
+ * @skb: skb to create fragment from
+ * @frag_head: header to use in new fragment
+ * @mtu: size of new fragment
+ *
+ * Split the passed skb into two fragments: A new one with size matching the
+ * passed mtu and the old one with the rest. The new skb contains data from the
+ * tail of the old skb.
+ *
+ * Returns the new fragment, NULL on error.
+ */
+static struct sk_buff *batadv_frag_create(struct sk_buff *skb,
+					  struct batadv_frag_packet *frag_head,
+					  unsigned int mtu)
+{
+	struct sk_buff *skb_fragment;
+	unsigned header_size = sizeof(*frag_head);
+	unsigned fragment_size = mtu - header_size;
+
+	skb_fragment = netdev_alloc_skb(NULL, mtu + ETH_HLEN);
+	if (!skb_fragment)
+		goto err;
+
+	skb->priority = TC_PRIO_CONTROL;
+
+	/* Eat the last mtu-bytes of the skb */
+	skb_reserve(skb_fragment, header_size + ETH_HLEN);
+	skb_split(skb, skb_fragment, skb->len - fragment_size);
+
+	/* Add the header */
+	skb_push(skb_fragment, header_size);
+	memcpy(skb_fragment->data, frag_head, header_size);
+
+err:
+	return skb_fragment;
+}
+
+/**
+ * batadv_frag_send_packet - create up to 16 fragments from the passed skb
+ * @skb: skb to create fragments from
+ * @orig_node: final destination of the created fragments
+ * @neigh_node: next-hop of the created fragments
+ *
+ * Returns true on success, false otherwise.
+ */
+bool batadv_frag_send_packet(struct sk_buff *skb,
+			     struct batadv_orig_node *orig_node,
+			     struct batadv_neigh_node *neigh_node)
+{
+	struct batadv_priv *bat_priv;
+	struct batadv_hard_iface *primary_if;
+	struct batadv_frag_packet frag_header;
+	struct sk_buff *skb_fragment;
+	unsigned mtu = neigh_node->if_incoming->net_dev->mtu;
+	unsigned header_size = sizeof(frag_header);
+	unsigned max_fragment_size, max_packet_size;
+
+	/* To avoid merge and refragmentation at next-hops we never send
+	 * fragments larger than BATADV_FRAG_MAX_FRAG_SIZE
+	 */
+	mtu = min_t(unsigned, mtu, BATADV_FRAG_MAX_FRAG_SIZE);
+	max_fragment_size = (mtu - header_size - ETH_HLEN);
+	max_packet_size = max_fragment_size * BATADV_FRAG_MAX_FRAGMENTS;
+
+	/* Don't even try to fragment, if we need more than 16 fragments */
+	if (skb->len > max_packet_size)
+		goto out_err;
+
+	bat_priv = orig_node->bat_priv;
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (!primary_if)
+		goto out_err;
+
+	/* Create one header to be copied to all fragments */
+	frag_header.header.packet_type = BATADV_UNICAST_FRAG;
+	frag_header.header.version = BATADV_COMPAT_VERSION;
+	frag_header.header.ttl = BATADV_TTL;
+	frag_header.seqno = htons(atomic_inc_return(&bat_priv->frag_seqno));
+	frag_header.reserved = 0;
+	frag_header.no = 0;
+	frag_header.total_size = htons(skb->len);
+	memcpy(frag_header.orig, primary_if->net_dev->dev_addr, ETH_ALEN);
+	memcpy(frag_header.dest, orig_node->orig, ETH_ALEN);
+
+	/* Eat and send fragments from the tail of skb */
+	while (skb->len > max_fragment_size) {
+		skb_fragment = batadv_frag_create(skb, &frag_header, mtu);
+		if (!skb_fragment)
+			goto out_err;
+
+		batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX);
+		batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES,
+				   skb_fragment->len + ETH_HLEN);
+		batadv_send_skb_packet(skb_fragment, neigh_node->if_incoming,
+				       neigh_node->addr);
+		frag_header.no++;
+
+		/* The initial check in this function should cover this case */
+		if (frag_header.no == BATADV_FRAG_MAX_FRAGMENTS - 1)
+			goto out_err;
+	}
+
+	/* Make room for the fragment header. */
+	if (batadv_skb_head_push(skb, header_size) < 0 ||
+	    pskb_expand_head(skb, header_size + ETH_HLEN, 0, GFP_ATOMIC) < 0)
+		goto out_err;
+
+	memcpy(skb->data, &frag_header, header_size);
+
+	/* Send the last fragment */
+	batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX);
+	batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES,
+			   skb->len + ETH_HLEN);
+	batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+
+	return true;
+out_err:
+	return false;
+}
diff --git a/net/batman-adv/fragmentation.h b/net/batman-adv/fragmentation.h
index 883a6f4..ca029e2 100644
--- a/net/batman-adv/fragmentation.h
+++ b/net/batman-adv/fragmentation.h
@@ -27,6 +27,9 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
 			 struct batadv_orig_node *orig_node_src);
 bool batadv_frag_skb_buffer(struct sk_buff **skb,
 			    struct batadv_orig_node *orig_node);
+bool batadv_frag_send_packet(struct sk_buff *skb,
+			     struct batadv_orig_node *orig_node,
+			     struct batadv_neigh_node *neigh_node);
 
 /**
  * batadv_frag_check_entry - check if a list of fragments has timed out
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index b8356ec..1a1aa59 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -28,8 +28,7 @@
 #include "gateway_client.h"
 #include "originator.h"
 #include "network-coding.h"
-
-#include <linux/if_ether.h>
+#include "fragmentation.h"
 
 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
 
@@ -109,7 +108,19 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 	/* batadv_find_router() increases neigh_nodes refcount if found. */
 	neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
 	if (!neigh_node)
-		return ret;
+		goto out;
+
+	/* Check if the skb is too large to send in one piece and fragment
+	 * it if needed.
+	 */
+	if (atomic_read(&bat_priv->fragmentation) &&
+	    skb->len > neigh_node->if_incoming->net_dev->mtu) {
+		/* Fragment and send packet. */
+		if (batadv_frag_send_packet(skb, orig_node, neigh_node))
+			ret = NET_XMIT_SUCCESS;
+
+		goto out;
+	}
 
 	/* try to network code the packet, if it is received on an interface
 	 * (i.e. being forwarded). If the packet originates from this node or if
@@ -123,7 +134,9 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 		ret = NET_XMIT_SUCCESS;
 	}
 
-	batadv_neigh_node_free_ref(neigh_node);
+out:
+	if (neigh_node)
+		batadv_neigh_node_free_ref(neigh_node);
 
 	return ret;
 }
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index dd189e6..18b1fd9 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -442,6 +442,7 @@ static void batadv_softif_destroy_finish(struct work_struct *work)
 static int batadv_softif_init_late(struct net_device *dev)
 {
 	struct batadv_priv *bat_priv;
+	uint32_t random_seqno;
 	int ret;
 	size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 
@@ -491,6 +492,10 @@ static int batadv_softif_init_late(struct net_device *dev)
 	bat_priv->tt.last_changeset = NULL;
 	bat_priv->tt.last_changeset_len = 0;
 
+	/* randomize initial seqno to avoid collision */
+	get_random_bytes(&random_seqno, sizeof(random_seqno));
+	atomic_set(&bat_priv->frag_seqno, random_seqno);
+
 	bat_priv->primary_if = NULL;
 	bat_priv->num_ifaces = 0;
 
@@ -758,6 +763,8 @@ static const struct {
 	{ "mgmt_tx_bytes" },
 	{ "mgmt_rx" },
 	{ "mgmt_rx_bytes" },
+	{ "frag_tx" },
+	{ "frag_tx_bytes" },
 	{ "frag_rx" },
 	{ "frag_rx_bytes" },
 	{ "frag_fwd" },
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 5a2cc7a..d517d5d 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -300,6 +300,8 @@ struct batadv_bcast_duplist_entry {
  * @BATADV_CNT_MGMT_TX_BYTES: transmitted routing protocol traffic bytes counter
  * @BATADV_CNT_MGMT_RX: received routing protocol traffic packet counter
  * @BATADV_CNT_MGMT_RX_BYTES: received routing protocol traffic bytes counter
+ * @BATADV_CNT_FRAG_TX: transmitted fragment traffic packet counter
+ * @BATADV_CNT_FRAG_TX_BYTES: transmitted fragment traffic bytes counter
  * @BATADV_CNT_FRAG_RX: received fragment traffic packet counter
  * @BATADV_CNT_FRAG_RX_BYTES: received fragment traffic bytes counter
  * @BATADV_CNT_FRAG_FWD: forwarded fragment traffic packet counter
@@ -341,6 +343,8 @@ enum batadv_counters {
 	BATADV_CNT_MGMT_TX_BYTES,
 	BATADV_CNT_MGMT_RX,
 	BATADV_CNT_MGMT_RX_BYTES,
+	BATADV_CNT_FRAG_TX,
+	BATADV_CNT_FRAG_TX_BYTES,
 	BATADV_CNT_FRAG_RX,
 	BATADV_CNT_FRAG_RX_BYTES,
 	BATADV_CNT_FRAG_FWD,
@@ -542,6 +546,7 @@ struct batadv_priv_nc {
  * @aggregated_ogms: bool indicating whether OGM aggregation is enabled
  * @bonding: bool indicating whether traffic bonding is enabled
  * @fragmentation: bool indicating whether traffic fragmentation is enabled
+ * @frag_seqno: incremental counter to identify chains of egress fragments
  * @ap_isolation: bool indicating whether ap isolation is enabled
  * @bridge_loop_avoidance: bool indicating whether bridge loop avoidance is
  *  enabled
@@ -585,6 +590,7 @@ struct batadv_priv {
 	atomic_t aggregated_ogms;
 	atomic_t bonding;
 	atomic_t fragmentation;
+	atomic_t frag_seqno;
 	atomic_t ap_isolation;
 #ifdef CONFIG_BATMAN_ADV_BLA
 	atomic_t bridge_loop_avoidance;
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 09/16] batman-adv: Fragment and send skbs larger than mtu
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, Martin Hundebøll, b.a.t.m.a.n, Marek Lindner,
	Antonio Quartulli

From: Martin Hundebøll <martin@hundeboll.net>

Non-broadcast packets larger than MTU are fragmented and sent with
an encapsulating header. Up to 16 fragments are supported, which are
sent in reverse order on the wire to allow minimal memory copying when
creating fragments.

Signed-off-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/fragmentation.c  | 121 ++++++++++++++++++++++++++++++++++++++++
 net/batman-adv/fragmentation.h  |   3 +
 net/batman-adv/send.c           |  21 +++++--
 net/batman-adv/soft-interface.c |   7 +++
 net/batman-adv/types.h          |   6 ++
 5 files changed, 154 insertions(+), 4 deletions(-)

diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index c829d3c..271d321 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -368,3 +368,124 @@ out:
 		batadv_neigh_node_free_ref(neigh_node);
 	return ret;
 }
+
+/**
+ * batadv_frag_create - create a fragment from skb
+ * @skb: skb to create fragment from
+ * @frag_head: header to use in new fragment
+ * @mtu: size of new fragment
+ *
+ * Split the passed skb into two fragments: A new one with size matching the
+ * passed mtu and the old one with the rest. The new skb contains data from the
+ * tail of the old skb.
+ *
+ * Returns the new fragment, NULL on error.
+ */
+static struct sk_buff *batadv_frag_create(struct sk_buff *skb,
+					  struct batadv_frag_packet *frag_head,
+					  unsigned int mtu)
+{
+	struct sk_buff *skb_fragment;
+	unsigned header_size = sizeof(*frag_head);
+	unsigned fragment_size = mtu - header_size;
+
+	skb_fragment = netdev_alloc_skb(NULL, mtu + ETH_HLEN);
+	if (!skb_fragment)
+		goto err;
+
+	skb->priority = TC_PRIO_CONTROL;
+
+	/* Eat the last mtu-bytes of the skb */
+	skb_reserve(skb_fragment, header_size + ETH_HLEN);
+	skb_split(skb, skb_fragment, skb->len - fragment_size);
+
+	/* Add the header */
+	skb_push(skb_fragment, header_size);
+	memcpy(skb_fragment->data, frag_head, header_size);
+
+err:
+	return skb_fragment;
+}
+
+/**
+ * batadv_frag_send_packet - create up to 16 fragments from the passed skb
+ * @skb: skb to create fragments from
+ * @orig_node: final destination of the created fragments
+ * @neigh_node: next-hop of the created fragments
+ *
+ * Returns true on success, false otherwise.
+ */
+bool batadv_frag_send_packet(struct sk_buff *skb,
+			     struct batadv_orig_node *orig_node,
+			     struct batadv_neigh_node *neigh_node)
+{
+	struct batadv_priv *bat_priv;
+	struct batadv_hard_iface *primary_if;
+	struct batadv_frag_packet frag_header;
+	struct sk_buff *skb_fragment;
+	unsigned mtu = neigh_node->if_incoming->net_dev->mtu;
+	unsigned header_size = sizeof(frag_header);
+	unsigned max_fragment_size, max_packet_size;
+
+	/* To avoid merge and refragmentation at next-hops we never send
+	 * fragments larger than BATADV_FRAG_MAX_FRAG_SIZE
+	 */
+	mtu = min_t(unsigned, mtu, BATADV_FRAG_MAX_FRAG_SIZE);
+	max_fragment_size = (mtu - header_size - ETH_HLEN);
+	max_packet_size = max_fragment_size * BATADV_FRAG_MAX_FRAGMENTS;
+
+	/* Don't even try to fragment, if we need more than 16 fragments */
+	if (skb->len > max_packet_size)
+		goto out_err;
+
+	bat_priv = orig_node->bat_priv;
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (!primary_if)
+		goto out_err;
+
+	/* Create one header to be copied to all fragments */
+	frag_header.header.packet_type = BATADV_UNICAST_FRAG;
+	frag_header.header.version = BATADV_COMPAT_VERSION;
+	frag_header.header.ttl = BATADV_TTL;
+	frag_header.seqno = htons(atomic_inc_return(&bat_priv->frag_seqno));
+	frag_header.reserved = 0;
+	frag_header.no = 0;
+	frag_header.total_size = htons(skb->len);
+	memcpy(frag_header.orig, primary_if->net_dev->dev_addr, ETH_ALEN);
+	memcpy(frag_header.dest, orig_node->orig, ETH_ALEN);
+
+	/* Eat and send fragments from the tail of skb */
+	while (skb->len > max_fragment_size) {
+		skb_fragment = batadv_frag_create(skb, &frag_header, mtu);
+		if (!skb_fragment)
+			goto out_err;
+
+		batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX);
+		batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES,
+				   skb_fragment->len + ETH_HLEN);
+		batadv_send_skb_packet(skb_fragment, neigh_node->if_incoming,
+				       neigh_node->addr);
+		frag_header.no++;
+
+		/* The initial check in this function should cover this case */
+		if (frag_header.no == BATADV_FRAG_MAX_FRAGMENTS - 1)
+			goto out_err;
+	}
+
+	/* Make room for the fragment header. */
+	if (batadv_skb_head_push(skb, header_size) < 0 ||
+	    pskb_expand_head(skb, header_size + ETH_HLEN, 0, GFP_ATOMIC) < 0)
+		goto out_err;
+
+	memcpy(skb->data, &frag_header, header_size);
+
+	/* Send the last fragment */
+	batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX);
+	batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES,
+			   skb->len + ETH_HLEN);
+	batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+
+	return true;
+out_err:
+	return false;
+}
diff --git a/net/batman-adv/fragmentation.h b/net/batman-adv/fragmentation.h
index 883a6f4..ca029e2 100644
--- a/net/batman-adv/fragmentation.h
+++ b/net/batman-adv/fragmentation.h
@@ -27,6 +27,9 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
 			 struct batadv_orig_node *orig_node_src);
 bool batadv_frag_skb_buffer(struct sk_buff **skb,
 			    struct batadv_orig_node *orig_node);
+bool batadv_frag_send_packet(struct sk_buff *skb,
+			     struct batadv_orig_node *orig_node,
+			     struct batadv_neigh_node *neigh_node);
 
 /**
  * batadv_frag_check_entry - check if a list of fragments has timed out
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index b8356ec..1a1aa59 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -28,8 +28,7 @@
 #include "gateway_client.h"
 #include "originator.h"
 #include "network-coding.h"
-
-#include <linux/if_ether.h>
+#include "fragmentation.h"
 
 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
 
@@ -109,7 +108,19 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 	/* batadv_find_router() increases neigh_nodes refcount if found. */
 	neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
 	if (!neigh_node)
-		return ret;
+		goto out;
+
+	/* Check if the skb is too large to send in one piece and fragment
+	 * it if needed.
+	 */
+	if (atomic_read(&bat_priv->fragmentation) &&
+	    skb->len > neigh_node->if_incoming->net_dev->mtu) {
+		/* Fragment and send packet. */
+		if (batadv_frag_send_packet(skb, orig_node, neigh_node))
+			ret = NET_XMIT_SUCCESS;
+
+		goto out;
+	}
 
 	/* try to network code the packet, if it is received on an interface
 	 * (i.e. being forwarded). If the packet originates from this node or if
@@ -123,7 +134,9 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 		ret = NET_XMIT_SUCCESS;
 	}
 
-	batadv_neigh_node_free_ref(neigh_node);
+out:
+	if (neigh_node)
+		batadv_neigh_node_free_ref(neigh_node);
 
 	return ret;
 }
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index dd189e6..18b1fd9 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -442,6 +442,7 @@ static void batadv_softif_destroy_finish(struct work_struct *work)
 static int batadv_softif_init_late(struct net_device *dev)
 {
 	struct batadv_priv *bat_priv;
+	uint32_t random_seqno;
 	int ret;
 	size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 
@@ -491,6 +492,10 @@ static int batadv_softif_init_late(struct net_device *dev)
 	bat_priv->tt.last_changeset = NULL;
 	bat_priv->tt.last_changeset_len = 0;
 
+	/* randomize initial seqno to avoid collision */
+	get_random_bytes(&random_seqno, sizeof(random_seqno));
+	atomic_set(&bat_priv->frag_seqno, random_seqno);
+
 	bat_priv->primary_if = NULL;
 	bat_priv->num_ifaces = 0;
 
@@ -758,6 +763,8 @@ static const struct {
 	{ "mgmt_tx_bytes" },
 	{ "mgmt_rx" },
 	{ "mgmt_rx_bytes" },
+	{ "frag_tx" },
+	{ "frag_tx_bytes" },
 	{ "frag_rx" },
 	{ "frag_rx_bytes" },
 	{ "frag_fwd" },
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 5a2cc7a..d517d5d 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -300,6 +300,8 @@ struct batadv_bcast_duplist_entry {
  * @BATADV_CNT_MGMT_TX_BYTES: transmitted routing protocol traffic bytes counter
  * @BATADV_CNT_MGMT_RX: received routing protocol traffic packet counter
  * @BATADV_CNT_MGMT_RX_BYTES: received routing protocol traffic bytes counter
+ * @BATADV_CNT_FRAG_TX: transmitted fragment traffic packet counter
+ * @BATADV_CNT_FRAG_TX_BYTES: transmitted fragment traffic bytes counter
  * @BATADV_CNT_FRAG_RX: received fragment traffic packet counter
  * @BATADV_CNT_FRAG_RX_BYTES: received fragment traffic bytes counter
  * @BATADV_CNT_FRAG_FWD: forwarded fragment traffic packet counter
@@ -341,6 +343,8 @@ enum batadv_counters {
 	BATADV_CNT_MGMT_TX_BYTES,
 	BATADV_CNT_MGMT_RX,
 	BATADV_CNT_MGMT_RX_BYTES,
+	BATADV_CNT_FRAG_TX,
+	BATADV_CNT_FRAG_TX_BYTES,
 	BATADV_CNT_FRAG_RX,
 	BATADV_CNT_FRAG_RX_BYTES,
 	BATADV_CNT_FRAG_FWD,
@@ -542,6 +546,7 @@ struct batadv_priv_nc {
  * @aggregated_ogms: bool indicating whether OGM aggregation is enabled
  * @bonding: bool indicating whether traffic bonding is enabled
  * @fragmentation: bool indicating whether traffic fragmentation is enabled
+ * @frag_seqno: incremental counter to identify chains of egress fragments
  * @ap_isolation: bool indicating whether ap isolation is enabled
  * @bridge_loop_avoidance: bool indicating whether bridge loop avoidance is
  *  enabled
@@ -585,6 +590,7 @@ struct batadv_priv {
 	atomic_t aggregated_ogms;
 	atomic_t bonding;
 	atomic_t fragmentation;
+	atomic_t frag_seqno;
 	atomic_t ap_isolation;
 #ifdef CONFIG_BATMAN_ADV_BLA
 	atomic_t bridge_loop_avoidance;
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 10/16] batman-adv: use htons when possible
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <ordex@autistici.org>

When comparing a network ordered value with a constant, it
is better to convert the constant at compile time by means
of htons() instead of converting the value at runtime using
ntohs().

This refactoring may slightly improve the code performance.

Moreover substitute __constant_htons() with htons() since
the latter increase readability and it is smart enough to be
as efficient as the former

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Acked-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
---
 net/batman-adv/bridge_loop_avoidance.c | 12 ++++++------
 net/batman-adv/gateway_client.c        |  4 ++--
 net/batman-adv/hard-interface.c        |  2 +-
 net/batman-adv/send.c                  |  4 ++--
 net/batman-adv/soft-interface.c        |  4 ++--
 5 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 70da18a..5bb58d7 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -863,25 +863,25 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
 	struct arphdr *arphdr;
 	uint8_t *hw_src, *hw_dst;
 	struct batadv_bla_claim_dst *bla_dst;
-	uint16_t proto;
+	__be16 proto;
 	int headlen;
 	unsigned short vid = BATADV_NO_FLAGS;
 	int ret;
 
 	ethhdr = eth_hdr(skb);
 
-	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
+	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
 		vhdr = (struct vlan_ethhdr *)ethhdr;
 		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 		vid |= BATADV_VLAN_HAS_TAG;
-		proto = ntohs(vhdr->h_vlan_encapsulated_proto);
+		proto = vhdr->h_vlan_encapsulated_proto;
 		headlen = sizeof(*vhdr);
 	} else {
-		proto = ntohs(ethhdr->h_proto);
+		proto = ethhdr->h_proto;
 		headlen = ETH_HLEN;
 	}
 
-	if (proto != ETH_P_ARP)
+	if (proto != htons(ETH_P_ARP))
 		return 0; /* not a claim frame */
 
 	/* this must be a ARP frame. check if it is a claim. */
@@ -1379,7 +1379,7 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb,
 
 	ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
 
-	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
+	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
 		if (!pskb_may_pull(skb, hdr_size + VLAN_ETH_HLEN))
 			return 0;
 
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index ac97ca7..053bb31 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -716,11 +716,11 @@ bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len)
 
 	/* check for bootp port */
 	if ((proto == htons(ETH_P_IP)) &&
-	    (ntohs(udphdr->dest) != 67))
+	    (udphdr->dest != htons(67)))
 		return false;
 
 	if ((proto == htons(ETH_P_IPV6)) &&
-	    (ntohs(udphdr->dest) != 547))
+	    (udphdr->dest != htons(547)))
 		return false;
 
 	return true;
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 0c8602e..004017c 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -379,7 +379,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 {
 	struct batadv_priv *bat_priv;
 	struct net_device *soft_iface, *master;
-	__be16 ethertype = __constant_htons(ETH_P_BATMAN);
+	__be16 ethertype = htons(ETH_P_BATMAN);
 	int ret;
 
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 1a1aa59..4bbcf51 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -63,10 +63,10 @@ int batadv_send_skb_packet(struct sk_buff *skb,
 	ethhdr = eth_hdr(skb);
 	memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
 	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
-	ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
+	ethhdr->h_proto = htons(ETH_P_BATMAN);
 
 	skb_set_network_header(skb, ETH_HLEN);
-	skb->protocol = __constant_htons(ETH_P_BATMAN);
+	skb->protocol = htons(ETH_P_BATMAN);
 
 	skb->dev = hard_iface->net_dev;
 
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 18b1fd9..87e7e4e 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -145,7 +145,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_bcast_packet *bcast_packet;
 	struct vlan_ethhdr *vhdr;
-	__be16 ethertype = __constant_htons(ETH_P_BATMAN);
+	__be16 ethertype = htons(ETH_P_BATMAN);
 	static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 						   0x00, 0x00};
 	static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
@@ -312,7 +312,7 @@ void batadv_interface_rx(struct net_device *soft_iface,
 	struct vlan_ethhdr *vhdr;
 	struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
 	unsigned short vid __maybe_unused = BATADV_NO_FLAGS;
-	__be16 ethertype = __constant_htons(ETH_P_BATMAN);
+	__be16 ethertype = htons(ETH_P_BATMAN);
 	bool is_bcast;
 
 	is_bcast = (batadv_header->packet_type == BATADV_BCAST);
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 10/16] batman-adv: use htons when possible
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <ordex@autistici.org>

When comparing a network ordered value with a constant, it
is better to convert the constant at compile time by means
of htons() instead of converting the value at runtime using
ntohs().

This refactoring may slightly improve the code performance.

Moreover substitute __constant_htons() with htons() since
the latter increase readability and it is smart enough to be
as efficient as the former

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Acked-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
---
 net/batman-adv/bridge_loop_avoidance.c | 12 ++++++------
 net/batman-adv/gateway_client.c        |  4 ++--
 net/batman-adv/hard-interface.c        |  2 +-
 net/batman-adv/send.c                  |  4 ++--
 net/batman-adv/soft-interface.c        |  4 ++--
 5 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 70da18a..5bb58d7 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -863,25 +863,25 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
 	struct arphdr *arphdr;
 	uint8_t *hw_src, *hw_dst;
 	struct batadv_bla_claim_dst *bla_dst;
-	uint16_t proto;
+	__be16 proto;
 	int headlen;
 	unsigned short vid = BATADV_NO_FLAGS;
 	int ret;
 
 	ethhdr = eth_hdr(skb);
 
-	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
+	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
 		vhdr = (struct vlan_ethhdr *)ethhdr;
 		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;
 		vid |= BATADV_VLAN_HAS_TAG;
-		proto = ntohs(vhdr->h_vlan_encapsulated_proto);
+		proto = vhdr->h_vlan_encapsulated_proto;
 		headlen = sizeof(*vhdr);
 	} else {
-		proto = ntohs(ethhdr->h_proto);
+		proto = ethhdr->h_proto;
 		headlen = ETH_HLEN;
 	}
 
-	if (proto != ETH_P_ARP)
+	if (proto != htons(ETH_P_ARP))
 		return 0; /* not a claim frame */
 
 	/* this must be a ARP frame. check if it is a claim. */
@@ -1379,7 +1379,7 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb,
 
 	ethhdr = (struct ethhdr *)(((uint8_t *)skb->data) + hdr_size);
 
-	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
+	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
 		if (!pskb_may_pull(skb, hdr_size + VLAN_ETH_HLEN))
 			return 0;
 
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index ac97ca7..053bb31 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -716,11 +716,11 @@ bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len)
 
 	/* check for bootp port */
 	if ((proto == htons(ETH_P_IP)) &&
-	    (ntohs(udphdr->dest) != 67))
+	    (udphdr->dest != htons(67)))
 		return false;
 
 	if ((proto == htons(ETH_P_IPV6)) &&
-	    (ntohs(udphdr->dest) != 547))
+	    (udphdr->dest != htons(547)))
 		return false;
 
 	return true;
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 0c8602e..004017c 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -379,7 +379,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 {
 	struct batadv_priv *bat_priv;
 	struct net_device *soft_iface, *master;
-	__be16 ethertype = __constant_htons(ETH_P_BATMAN);
+	__be16 ethertype = htons(ETH_P_BATMAN);
 	int ret;
 
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 1a1aa59..4bbcf51 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -63,10 +63,10 @@ int batadv_send_skb_packet(struct sk_buff *skb,
 	ethhdr = eth_hdr(skb);
 	memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
 	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
-	ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
+	ethhdr->h_proto = htons(ETH_P_BATMAN);
 
 	skb_set_network_header(skb, ETH_HLEN);
-	skb->protocol = __constant_htons(ETH_P_BATMAN);
+	skb->protocol = htons(ETH_P_BATMAN);
 
 	skb->dev = hard_iface->net_dev;
 
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 18b1fd9..87e7e4e 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -145,7 +145,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_bcast_packet *bcast_packet;
 	struct vlan_ethhdr *vhdr;
-	__be16 ethertype = __constant_htons(ETH_P_BATMAN);
+	__be16 ethertype = htons(ETH_P_BATMAN);
 	static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00,
 						   0x00, 0x00};
 	static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00,
@@ -312,7 +312,7 @@ void batadv_interface_rx(struct net_device *soft_iface,
 	struct vlan_ethhdr *vhdr;
 	struct batadv_header *batadv_header = (struct batadv_header *)skb->data;
 	unsigned short vid __maybe_unused = BATADV_NO_FLAGS;
-	__be16 ethertype = __constant_htons(ETH_P_BATMAN);
+	__be16 ethertype = htons(ETH_P_BATMAN);
 	bool is_bcast;
 
 	is_bcast = (batadv_header->packet_type == BATADV_BCAST);
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 11/16] batman-adv: create common header for ICMP packets
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <antonio@open-mesh.com>

the icmp and the icmp_rr packets share the same initial
fields since they use the same code to be processed and
forwarded.

Extract the common fields and put them into a separate
struct so that future ICMP packets can be easily added
without bloating the packet definition.

However, keep the seqno field outside of the newly created
common header because future ICMP types may require a
bigger sequence number space.

This change breaks compatibility due to fields reordering
in the ICMP headers.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/icmp_socket.c | 22 ++++++++++-----------
 net/batman-adv/main.c        |  4 ++--
 net/batman-adv/packet.h      | 46 ++++++++++++++++++++++++++++++--------------
 net/batman-adv/routing.c     | 40 ++++++++++++++++++++------------------
 4 files changed, 66 insertions(+), 46 deletions(-)

diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index 5a99bb4..82ac647 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -192,25 +192,25 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 		goto free_skb;
 	}
 
-	if (icmp_packet->header.packet_type != BATADV_ICMP) {
+	if (icmp_packet->icmph.header.packet_type != BATADV_ICMP) {
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
 		len = -EINVAL;
 		goto free_skb;
 	}
 
-	if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
+	if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) {
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n");
 		len = -EINVAL;
 		goto free_skb;
 	}
 
-	icmp_packet->uid = socket_client->index;
+	icmp_packet->icmph.uid = socket_client->index;
 
-	if (icmp_packet->header.version != BATADV_COMPAT_VERSION) {
-		icmp_packet->msg_type = BATADV_PARAMETER_PROBLEM;
-		icmp_packet->header.version = BATADV_COMPAT_VERSION;
+	if (icmp_packet->icmph.header.version != BATADV_COMPAT_VERSION) {
+		icmp_packet->icmph.msg_type = BATADV_PARAMETER_PROBLEM;
+		icmp_packet->icmph.header.version = BATADV_COMPAT_VERSION;
 		batadv_socket_add_packet(socket_client, icmp_packet,
 					 packet_len);
 		goto free_skb;
@@ -219,7 +219,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 		goto dst_unreach;
 
-	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst);
+	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst);
 	if (!orig_node)
 		goto dst_unreach;
 
@@ -233,7 +233,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 	if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE)
 		goto dst_unreach;
 
-	memcpy(icmp_packet->orig,
+	memcpy(icmp_packet->icmph.orig,
 	       primary_if->net_dev->dev_addr, ETH_ALEN);
 
 	if (packet_len == sizeof(struct batadv_icmp_packet_rr))
@@ -244,7 +244,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 	goto out;
 
 dst_unreach:
-	icmp_packet->msg_type = BATADV_DESTINATION_UNREACHABLE;
+	icmp_packet->icmph.msg_type = BATADV_DESTINATION_UNREACHABLE;
 	batadv_socket_add_packet(socket_client, icmp_packet, packet_len);
 free_skb:
 	kfree_skb(skb);
@@ -318,7 +318,7 @@ static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
 	/* while waiting for the lock the socket_client could have been
 	 * deleted
 	 */
-	if (!batadv_socket_client_hash[icmp_packet->uid]) {
+	if (!batadv_socket_client_hash[icmp_packet->icmph.uid]) {
 		spin_unlock_bh(&socket_client->lock);
 		kfree(socket_packet);
 		return;
@@ -347,7 +347,7 @@ void batadv_socket_receive_packet(struct batadv_icmp_packet_rr *icmp_packet,
 {
 	struct batadv_socket_client *hash;
 
-	hash = batadv_socket_client_hash[icmp_packet->uid];
+	hash = batadv_socket_client_hash[icmp_packet->icmph.uid];
 	if (hash)
 		batadv_socket_add_packet(hash, icmp_packet, icmp_len);
 }
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index ca6f134..519138e 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -401,8 +401,8 @@ static void batadv_recv_handler_init(void)
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_frag_packet, dest) != 4);
-	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4);
-	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, icmph.dst) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, icmph.dst) != 4);
 
 	/* broadcast packet */
 	batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index aa46c27..65e723e 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -186,29 +186,47 @@ struct batadv_ogm_packet {
 
 #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)
 
+/**
+ * batadv_icmp_header - common ICMP header
+ * @header: common batman header
+ * @msg_type: ICMP packet type
+ * @dst: address of the destination node
+ * @orig: address of the source node
+ * @uid: local ICMP socket identifier
+ */
+struct batadv_icmp_header {
+	struct batadv_header header;
+	uint8_t  msg_type; /* see ICMP message types above */
+	uint8_t  dst[ETH_ALEN];
+	uint8_t  orig[ETH_ALEN];
+	uint8_t  uid;
+};
+
+/**
+ * batadv_icmp_packet - ICMP packet
+ * @icmph: common ICMP header
+ * @reserved: not used - useful for alignment
+ * @seqno: ICMP sequence number
+ */
 struct batadv_icmp_packet {
-	struct batadv_header header;
-	uint8_t  msg_type; /* see ICMP message types above */
-	uint8_t  dst[ETH_ALEN];
-	uint8_t  orig[ETH_ALEN];
-	__be16   seqno;
-	uint8_t  uid;
+	struct batadv_icmp_header icmph;
 	uint8_t  reserved;
+	__be16   seqno;
 };
 
 #define BATADV_RR_LEN 16
 
-/* icmp_packet_rr must start with all fields from imcp_packet
- * as this is assumed by code that handles ICMP packets
+/**
+ * batadv_icmp_packet_rr - ICMP RouteRecord packet
+ * @icmph: common ICMP header
+ * @rr_cur: number of entries the rr array
+ * @seqno: ICMP sequence number
+ * @rr: route record array
  */
 struct batadv_icmp_packet_rr {
-	struct batadv_header header;
-	uint8_t  msg_type; /* see ICMP message types above */
-	uint8_t  dst[ETH_ALEN];
-	uint8_t  orig[ETH_ALEN];
-	__be16   seqno;
-	uint8_t  uid;
+	struct batadv_icmp_header icmph;
 	uint8_t  rr_cur;
+	__be16   seqno;
 	uint8_t  rr[BATADV_RR_LEN][ETH_ALEN];
 };
 
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index a080f63..3281a50 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -258,7 +258,7 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
 	/* add data to device queue */
-	if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
+	if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) {
 		batadv_socket_receive_packet(icmp_packet, icmp_len);
 		goto out;
 	}
@@ -269,7 +269,7 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 
 	/* answer echo request (ping) */
 	/* get routing information */
-	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
+	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig);
 	if (!orig_node)
 		goto out;
 
@@ -279,10 +279,11 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
-	memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
-	memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
-	icmp_packet->msg_type = BATADV_ECHO_REPLY;
-	icmp_packet->header.ttl = BATADV_TTL;
+	memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN);
+	memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr,
+	       ETH_ALEN);
+	icmp_packet->icmph.msg_type = BATADV_ECHO_REPLY;
+	icmp_packet->icmph.header.ttl = BATADV_TTL;
 
 	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
 		ret = NET_RX_SUCCESS;
@@ -306,9 +307,9 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 	icmp_packet = (struct batadv_icmp_packet *)skb->data;
 
 	/* send TTL exceeded if packet is an echo request (traceroute) */
-	if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
+	if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) {
 		pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
-			 icmp_packet->orig, icmp_packet->dst);
+			 icmp_packet->icmph.orig, icmp_packet->icmph.dst);
 		goto out;
 	}
 
@@ -317,7 +318,7 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 		goto out;
 
 	/* get routing information */
-	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
+	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig);
 	if (!orig_node)
 		goto out;
 
@@ -327,10 +328,11 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 
 	icmp_packet = (struct batadv_icmp_packet *)skb->data;
 
-	memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
-	memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
-	icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
-	icmp_packet->header.ttl = BATADV_TTL;
+	memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN);
+	memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr,
+	       ETH_ALEN);
+	icmp_packet->icmph.msg_type = BATADV_TTL_EXCEEDED;
+	icmp_packet->icmph.header.ttl = BATADV_TTL;
 
 	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
 		ret = NET_RX_SUCCESS;
@@ -379,8 +381,8 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
 	/* add record route information if not full */
-	if ((icmp_packet->msg_type == BATADV_ECHO_REPLY ||
-	     icmp_packet->msg_type == BATADV_ECHO_REQUEST) &&
+	if ((icmp_packet->icmph.msg_type == BATADV_ECHO_REPLY ||
+	     icmp_packet->icmph.msg_type == BATADV_ECHO_REQUEST) &&
 	    (hdr_size == sizeof(struct batadv_icmp_packet_rr)) &&
 	    (icmp_packet->rr_cur < BATADV_RR_LEN)) {
 		memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
@@ -389,15 +391,15 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	}
 
 	/* packet for me */
-	if (batadv_is_my_mac(bat_priv, icmp_packet->dst))
+	if (batadv_is_my_mac(bat_priv, icmp_packet->icmph.dst))
 		return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size);
 
 	/* TTL exceeded */
-	if (icmp_packet->header.ttl < 2)
+	if (icmp_packet->icmph.header.ttl < 2)
 		return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
 
 	/* get routing information */
-	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst);
+	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst);
 	if (!orig_node)
 		goto out;
 
@@ -408,7 +410,7 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
 	/* decrement ttl */
-	icmp_packet->header.ttl--;
+	icmp_packet->icmph.header.ttl--;
 
 	/* route it */
 	if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 11/16] batman-adv: create common header for ICMP packets
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <antonio@open-mesh.com>

the icmp and the icmp_rr packets share the same initial
fields since they use the same code to be processed and
forwarded.

Extract the common fields and put them into a separate
struct so that future ICMP packets can be easily added
without bloating the packet definition.

However, keep the seqno field outside of the newly created
common header because future ICMP types may require a
bigger sequence number space.

This change breaks compatibility due to fields reordering
in the ICMP headers.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/icmp_socket.c | 22 ++++++++++-----------
 net/batman-adv/main.c        |  4 ++--
 net/batman-adv/packet.h      | 46 ++++++++++++++++++++++++++++++--------------
 net/batman-adv/routing.c     | 40 ++++++++++++++++++++------------------
 4 files changed, 66 insertions(+), 46 deletions(-)

diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index 5a99bb4..82ac647 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -192,25 +192,25 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 		goto free_skb;
 	}
 
-	if (icmp_packet->header.packet_type != BATADV_ICMP) {
+	if (icmp_packet->icmph.header.packet_type != BATADV_ICMP) {
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
 		len = -EINVAL;
 		goto free_skb;
 	}
 
-	if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
+	if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) {
 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 			   "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n");
 		len = -EINVAL;
 		goto free_skb;
 	}
 
-	icmp_packet->uid = socket_client->index;
+	icmp_packet->icmph.uid = socket_client->index;
 
-	if (icmp_packet->header.version != BATADV_COMPAT_VERSION) {
-		icmp_packet->msg_type = BATADV_PARAMETER_PROBLEM;
-		icmp_packet->header.version = BATADV_COMPAT_VERSION;
+	if (icmp_packet->icmph.header.version != BATADV_COMPAT_VERSION) {
+		icmp_packet->icmph.msg_type = BATADV_PARAMETER_PROBLEM;
+		icmp_packet->icmph.header.version = BATADV_COMPAT_VERSION;
 		batadv_socket_add_packet(socket_client, icmp_packet,
 					 packet_len);
 		goto free_skb;
@@ -219,7 +219,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 		goto dst_unreach;
 
-	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst);
+	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst);
 	if (!orig_node)
 		goto dst_unreach;
 
@@ -233,7 +233,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 	if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE)
 		goto dst_unreach;
 
-	memcpy(icmp_packet->orig,
+	memcpy(icmp_packet->icmph.orig,
 	       primary_if->net_dev->dev_addr, ETH_ALEN);
 
 	if (packet_len == sizeof(struct batadv_icmp_packet_rr))
@@ -244,7 +244,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
 	goto out;
 
 dst_unreach:
-	icmp_packet->msg_type = BATADV_DESTINATION_UNREACHABLE;
+	icmp_packet->icmph.msg_type = BATADV_DESTINATION_UNREACHABLE;
 	batadv_socket_add_packet(socket_client, icmp_packet, packet_len);
 free_skb:
 	kfree_skb(skb);
@@ -318,7 +318,7 @@ static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
 	/* while waiting for the lock the socket_client could have been
 	 * deleted
 	 */
-	if (!batadv_socket_client_hash[icmp_packet->uid]) {
+	if (!batadv_socket_client_hash[icmp_packet->icmph.uid]) {
 		spin_unlock_bh(&socket_client->lock);
 		kfree(socket_packet);
 		return;
@@ -347,7 +347,7 @@ void batadv_socket_receive_packet(struct batadv_icmp_packet_rr *icmp_packet,
 {
 	struct batadv_socket_client *hash;
 
-	hash = batadv_socket_client_hash[icmp_packet->uid];
+	hash = batadv_socket_client_hash[icmp_packet->icmph.uid];
 	if (hash)
 		batadv_socket_add_packet(hash, icmp_packet, icmp_len);
 }
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index ca6f134..519138e 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -401,8 +401,8 @@ static void batadv_recv_handler_init(void)
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4);
 	BUILD_BUG_ON(offsetof(struct batadv_frag_packet, dest) != 4);
-	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4);
-	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, icmph.dst) != 4);
+	BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, icmph.dst) != 4);
 
 	/* broadcast packet */
 	batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h
index aa46c27..65e723e 100644
--- a/net/batman-adv/packet.h
+++ b/net/batman-adv/packet.h
@@ -186,29 +186,47 @@ struct batadv_ogm_packet {
 
 #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)
 
+/**
+ * batadv_icmp_header - common ICMP header
+ * @header: common batman header
+ * @msg_type: ICMP packet type
+ * @dst: address of the destination node
+ * @orig: address of the source node
+ * @uid: local ICMP socket identifier
+ */
+struct batadv_icmp_header {
+	struct batadv_header header;
+	uint8_t  msg_type; /* see ICMP message types above */
+	uint8_t  dst[ETH_ALEN];
+	uint8_t  orig[ETH_ALEN];
+	uint8_t  uid;
+};
+
+/**
+ * batadv_icmp_packet - ICMP packet
+ * @icmph: common ICMP header
+ * @reserved: not used - useful for alignment
+ * @seqno: ICMP sequence number
+ */
 struct batadv_icmp_packet {
-	struct batadv_header header;
-	uint8_t  msg_type; /* see ICMP message types above */
-	uint8_t  dst[ETH_ALEN];
-	uint8_t  orig[ETH_ALEN];
-	__be16   seqno;
-	uint8_t  uid;
+	struct batadv_icmp_header icmph;
 	uint8_t  reserved;
+	__be16   seqno;
 };
 
 #define BATADV_RR_LEN 16
 
-/* icmp_packet_rr must start with all fields from imcp_packet
- * as this is assumed by code that handles ICMP packets
+/**
+ * batadv_icmp_packet_rr - ICMP RouteRecord packet
+ * @icmph: common ICMP header
+ * @rr_cur: number of entries the rr array
+ * @seqno: ICMP sequence number
+ * @rr: route record array
  */
 struct batadv_icmp_packet_rr {
-	struct batadv_header header;
-	uint8_t  msg_type; /* see ICMP message types above */
-	uint8_t  dst[ETH_ALEN];
-	uint8_t  orig[ETH_ALEN];
-	__be16   seqno;
-	uint8_t  uid;
+	struct batadv_icmp_header icmph;
 	uint8_t  rr_cur;
+	__be16   seqno;
 	uint8_t  rr[BATADV_RR_LEN][ETH_ALEN];
 };
 
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index a080f63..3281a50 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -258,7 +258,7 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
 	/* add data to device queue */
-	if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
+	if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) {
 		batadv_socket_receive_packet(icmp_packet, icmp_len);
 		goto out;
 	}
@@ -269,7 +269,7 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 
 	/* answer echo request (ping) */
 	/* get routing information */
-	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
+	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig);
 	if (!orig_node)
 		goto out;
 
@@ -279,10 +279,11 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
-	memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
-	memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
-	icmp_packet->msg_type = BATADV_ECHO_REPLY;
-	icmp_packet->header.ttl = BATADV_TTL;
+	memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN);
+	memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr,
+	       ETH_ALEN);
+	icmp_packet->icmph.msg_type = BATADV_ECHO_REPLY;
+	icmp_packet->icmph.header.ttl = BATADV_TTL;
 
 	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
 		ret = NET_RX_SUCCESS;
@@ -306,9 +307,9 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 	icmp_packet = (struct batadv_icmp_packet *)skb->data;
 
 	/* send TTL exceeded if packet is an echo request (traceroute) */
-	if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
+	if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) {
 		pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
-			 icmp_packet->orig, icmp_packet->dst);
+			 icmp_packet->icmph.orig, icmp_packet->icmph.dst);
 		goto out;
 	}
 
@@ -317,7 +318,7 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 		goto out;
 
 	/* get routing information */
-	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig);
+	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig);
 	if (!orig_node)
 		goto out;
 
@@ -327,10 +328,11 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 
 	icmp_packet = (struct batadv_icmp_packet *)skb->data;
 
-	memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
-	memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
-	icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
-	icmp_packet->header.ttl = BATADV_TTL;
+	memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN);
+	memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr,
+	       ETH_ALEN);
+	icmp_packet->icmph.msg_type = BATADV_TTL_EXCEEDED;
+	icmp_packet->icmph.header.ttl = BATADV_TTL;
 
 	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
 		ret = NET_RX_SUCCESS;
@@ -379,8 +381,8 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
 	/* add record route information if not full */
-	if ((icmp_packet->msg_type == BATADV_ECHO_REPLY ||
-	     icmp_packet->msg_type == BATADV_ECHO_REQUEST) &&
+	if ((icmp_packet->icmph.msg_type == BATADV_ECHO_REPLY ||
+	     icmp_packet->icmph.msg_type == BATADV_ECHO_REQUEST) &&
 	    (hdr_size == sizeof(struct batadv_icmp_packet_rr)) &&
 	    (icmp_packet->rr_cur < BATADV_RR_LEN)) {
 		memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
@@ -389,15 +391,15 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	}
 
 	/* packet for me */
-	if (batadv_is_my_mac(bat_priv, icmp_packet->dst))
+	if (batadv_is_my_mac(bat_priv, icmp_packet->icmph.dst))
 		return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size);
 
 	/* TTL exceeded */
-	if (icmp_packet->header.ttl < 2)
+	if (icmp_packet->icmph.header.ttl < 2)
 		return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);
 
 	/* get routing information */
-	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst);
+	orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst);
 	if (!orig_node)
 		goto out;
 
@@ -408,7 +410,7 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;
 
 	/* decrement ttl */
-	icmp_packet->header.ttl--;
+	icmp_packet->icmph.header.ttl--;
 
 	/* route it */
 	if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 12/16] batman-adv: consider network coding overhead when calculating required mtu
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Marek Lindner <lindner_marek@yahoo.de>

The module prints a warning when the MTU on the hard interface is too
small to transfer payload traffic without fragmentation. The required
MTU is calculated based on the encapsulation header size. If network
coding is compild into the module its header size is taken into
account as well.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/hard-interface.c | 19 ++++++++++---------
 net/batman-adv/main.c           | 25 +++++++++++++++++++++++++
 net/batman-adv/main.h           |  1 +
 net/batman-adv/soft-interface.c |  2 +-
 net/batman-adv/types.h          |  7 -------
 5 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 004017c..d564af2 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -269,9 +269,10 @@ int batadv_hardif_min_mtu(struct net_device *soft_iface)
 	const struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 	const struct batadv_hard_iface *hard_iface;
 	/* allow big frames if all devices are capable to do so
-	 * (have MTU > 1500 + BAT_HEADER_LEN)
+	 * (have MTU > 1500 + batadv_max_header_len())
 	 */
 	int min_mtu = ETH_DATA_LEN;
+	int max_header_len = batadv_max_header_len();
 
 	if (atomic_read(&bat_priv->fragmentation))
 		goto out;
@@ -285,8 +286,7 @@ int batadv_hardif_min_mtu(struct net_device *soft_iface)
 		if (hard_iface->soft_iface != soft_iface)
 			continue;
 
-		min_mtu = min_t(int,
-				hard_iface->net_dev->mtu - BATADV_HEADER_LEN,
+		min_mtu = min_t(int, hard_iface->net_dev->mtu - max_header_len,
 				min_mtu);
 	}
 	rcu_read_unlock();
@@ -380,6 +380,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	struct batadv_priv *bat_priv;
 	struct net_device *soft_iface, *master;
 	__be16 ethertype = htons(ETH_P_BATMAN);
+	int max_header_len = batadv_max_header_len();
 	int ret;
 
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
@@ -448,18 +449,18 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 		    hard_iface->net_dev->name);
 
 	if (atomic_read(&bat_priv->fragmentation) &&
-	    hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
+	    hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 		batadv_info(hard_iface->soft_iface,
-			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %zi would solve the problem.\n",
+			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n",
 			    hard_iface->net_dev->name, hard_iface->net_dev->mtu,
-			    ETH_DATA_LEN + BATADV_HEADER_LEN);
+			    ETH_DATA_LEN + max_header_len);
 
 	if (!atomic_read(&bat_priv->fragmentation) &&
-	    hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
+	    hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 		batadv_info(hard_iface->soft_iface,
-			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %zi.\n",
+			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n",
 			    hard_iface->net_dev->name, hard_iface->net_dev->mtu,
-			    ETH_DATA_LEN + BATADV_HEADER_LEN);
+			    ETH_DATA_LEN + max_header_len);
 
 	if (batadv_hardif_is_iface_up(hard_iface))
 		batadv_hardif_activate_interface(hard_iface);
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 519138e..7f3a5c4 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -256,6 +256,31 @@ out:
 }
 
 /**
+ * batadv_max_header_len - calculate maximum encapsulation overhead for a
+ *  payload packet
+ *
+ * Return the maximum encapsulation overhead in bytes.
+ */
+int batadv_max_header_len(void)
+{
+	int header_len = 0;
+
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_unicast_packet));
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_unicast_4addr_packet));
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_bcast_packet));
+
+#ifdef CONFIG_BATMAN_ADV_NC
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_coded_packet));
+#endif
+
+	return header_len;
+}
+
+/**
  * batadv_skb_set_priority - sets skb priority according to packet content
  * @skb: the packet to be sent
  * @offset: offset to the packet content
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 6a74a42..54c13d5 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -191,6 +191,7 @@ void batadv_mesh_free(struct net_device *soft_iface);
 int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr);
 struct batadv_hard_iface *
 batadv_seq_print_text_primary_if_get(struct seq_file *seq);
+int batadv_max_header_len(void);
 void batadv_skb_set_priority(struct sk_buff *skb, int offset);
 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 			   struct packet_type *ptype,
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 87e7e4e..15c7237 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -626,7 +626,7 @@ static void batadv_softif_init_early(struct net_device *dev)
 	 */
 	dev->mtu = ETH_DATA_LEN;
 	/* reserve more space in the skbuff for our header */
-	dev->hard_header_len = BATADV_HEADER_LEN;
+	dev->hard_header_len = batadv_max_header_len();
 
 	/* generate random address */
 	eth_hw_addr_random(dev);
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index d517d5d..5cbb0d0 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -24,13 +24,6 @@
 #include "bitarray.h"
 #include <linux/kernel.h>
 
-/**
- * Maximum overhead for the encapsulation for a payload packet
- */
-#define BATADV_HEADER_LEN \
-	(ETH_HLEN + max(sizeof(struct batadv_unicast_packet), \
-			sizeof(struct batadv_bcast_packet)))
-
 #ifdef CONFIG_BATMAN_ADV_DAT
 
 /* batadv_dat_addr_t is the type used for all DHT addresses. If it is changed,
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 12/16] batman-adv: consider network coding overhead when calculating required mtu
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Marek Lindner <lindner_marek@yahoo.de>

The module prints a warning when the MTU on the hard interface is too
small to transfer payload traffic without fragmentation. The required
MTU is calculated based on the encapsulation header size. If network
coding is compild into the module its header size is taken into
account as well.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/hard-interface.c | 19 ++++++++++---------
 net/batman-adv/main.c           | 25 +++++++++++++++++++++++++
 net/batman-adv/main.h           |  1 +
 net/batman-adv/soft-interface.c |  2 +-
 net/batman-adv/types.h          |  7 -------
 5 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 004017c..d564af2 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -269,9 +269,10 @@ int batadv_hardif_min_mtu(struct net_device *soft_iface)
 	const struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 	const struct batadv_hard_iface *hard_iface;
 	/* allow big frames if all devices are capable to do so
-	 * (have MTU > 1500 + BAT_HEADER_LEN)
+	 * (have MTU > 1500 + batadv_max_header_len())
 	 */
 	int min_mtu = ETH_DATA_LEN;
+	int max_header_len = batadv_max_header_len();
 
 	if (atomic_read(&bat_priv->fragmentation))
 		goto out;
@@ -285,8 +286,7 @@ int batadv_hardif_min_mtu(struct net_device *soft_iface)
 		if (hard_iface->soft_iface != soft_iface)
 			continue;
 
-		min_mtu = min_t(int,
-				hard_iface->net_dev->mtu - BATADV_HEADER_LEN,
+		min_mtu = min_t(int, hard_iface->net_dev->mtu - max_header_len,
 				min_mtu);
 	}
 	rcu_read_unlock();
@@ -380,6 +380,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	struct batadv_priv *bat_priv;
 	struct net_device *soft_iface, *master;
 	__be16 ethertype = htons(ETH_P_BATMAN);
+	int max_header_len = batadv_max_header_len();
 	int ret;
 
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
@@ -448,18 +449,18 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 		    hard_iface->net_dev->name);
 
 	if (atomic_read(&bat_priv->fragmentation) &&
-	    hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
+	    hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 		batadv_info(hard_iface->soft_iface,
-			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %zi would solve the problem.\n",
+			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n",
 			    hard_iface->net_dev->name, hard_iface->net_dev->mtu,
-			    ETH_DATA_LEN + BATADV_HEADER_LEN);
+			    ETH_DATA_LEN + max_header_len);
 
 	if (!atomic_read(&bat_priv->fragmentation) &&
-	    hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
+	    hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
 		batadv_info(hard_iface->soft_iface,
-			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %zi.\n",
+			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n",
 			    hard_iface->net_dev->name, hard_iface->net_dev->mtu,
-			    ETH_DATA_LEN + BATADV_HEADER_LEN);
+			    ETH_DATA_LEN + max_header_len);
 
 	if (batadv_hardif_is_iface_up(hard_iface))
 		batadv_hardif_activate_interface(hard_iface);
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 519138e..7f3a5c4 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -256,6 +256,31 @@ out:
 }
 
 /**
+ * batadv_max_header_len - calculate maximum encapsulation overhead for a
+ *  payload packet
+ *
+ * Return the maximum encapsulation overhead in bytes.
+ */
+int batadv_max_header_len(void)
+{
+	int header_len = 0;
+
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_unicast_packet));
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_unicast_4addr_packet));
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_bcast_packet));
+
+#ifdef CONFIG_BATMAN_ADV_NC
+	header_len = max_t(int, header_len,
+			   sizeof(struct batadv_coded_packet));
+#endif
+
+	return header_len;
+}
+
+/**
  * batadv_skb_set_priority - sets skb priority according to packet content
  * @skb: the packet to be sent
  * @offset: offset to the packet content
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 6a74a42..54c13d5 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -191,6 +191,7 @@ void batadv_mesh_free(struct net_device *soft_iface);
 int batadv_is_my_mac(struct batadv_priv *bat_priv, const uint8_t *addr);
 struct batadv_hard_iface *
 batadv_seq_print_text_primary_if_get(struct seq_file *seq);
+int batadv_max_header_len(void);
 void batadv_skb_set_priority(struct sk_buff *skb, int offset);
 int batadv_batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
 			   struct packet_type *ptype,
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 87e7e4e..15c7237 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -626,7 +626,7 @@ static void batadv_softif_init_early(struct net_device *dev)
 	 */
 	dev->mtu = ETH_DATA_LEN;
 	/* reserve more space in the skbuff for our header */
-	dev->hard_header_len = BATADV_HEADER_LEN;
+	dev->hard_header_len = batadv_max_header_len();
 
 	/* generate random address */
 	eth_hw_addr_random(dev);
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index d517d5d..5cbb0d0 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -24,13 +24,6 @@
 #include "bitarray.h"
 #include <linux/kernel.h>
 
-/**
- * Maximum overhead for the encapsulation for a payload packet
- */
-#define BATADV_HEADER_LEN \
-	(ETH_HLEN + max(sizeof(struct batadv_unicast_packet), \
-			sizeof(struct batadv_bcast_packet)))
-
 #ifdef CONFIG_BATMAN_ADV_DAT
 
 /* batadv_dat_addr_t is the type used for all DHT addresses. If it is changed,
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 13/16] batman-adv: remove useless find_router look up
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, b.a.t.m.a.n, Simon Wunderlich, Marek Lindner, Antonio Quartulli

From: Simon Wunderlich <simon@open-mesh.com>

This is not used anymore with the new fragmentation, and it might
actually mess up the bonding code because find_router() assumes it
is only called once per packet.

Signed-off-by: Simon Wunderlich <simon@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/send.c | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 4bbcf51..82588e4 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -250,30 +250,19 @@ int batadv_send_skb_generic_unicast(struct batadv_priv *bat_priv,
 	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 	struct batadv_unicast_packet *unicast_packet;
 	struct batadv_orig_node *orig_node;
-	struct batadv_neigh_node *neigh_node;
 	int ret = NET_RX_DROP;
 
 	/* get routing information */
-	if (is_multicast_ether_addr(ethhdr->h_dest)) {
+	if (is_multicast_ether_addr(ethhdr->h_dest))
 		orig_node = batadv_gw_get_selected_orig(bat_priv);
-		if (orig_node)
-			goto find_router;
-	}
+	else
+		/* check for tt host - increases orig_node refcount.
+		 * returns NULL in case of AP isolation
+		 */
+		orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
+						     ethhdr->h_dest);
 
-	/* check for tt host - increases orig_node refcount.
-	 * returns NULL in case of AP isolation
-	 */
-	orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
-					     ethhdr->h_dest);
-
-find_router:
-	/* find_router():
-	 *  - if orig_node is NULL it returns NULL
-	 *  - increases neigh_nodes refcount if found.
-	 */
-	neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
-
-	if (!neigh_node)
+	if (!orig_node)
 		goto out;
 
 	switch (packet_type) {
@@ -305,8 +294,6 @@ find_router:
 		ret = 0;
 
 out:
-	if (neigh_node)
-		batadv_neigh_node_free_ref(neigh_node);
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
 	if (ret == NET_RX_DROP)
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 13/16] batman-adv: remove useless find_router look up
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem
  Cc: netdev, Simon Wunderlich, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Simon Wunderlich <simon@open-mesh.com>

This is not used anymore with the new fragmentation, and it might
actually mess up the bonding code because find_router() assumes it
is only called once per packet.

Signed-off-by: Simon Wunderlich <simon@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/send.c | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index 4bbcf51..82588e4 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -250,30 +250,19 @@ int batadv_send_skb_generic_unicast(struct batadv_priv *bat_priv,
 	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
 	struct batadv_unicast_packet *unicast_packet;
 	struct batadv_orig_node *orig_node;
-	struct batadv_neigh_node *neigh_node;
 	int ret = NET_RX_DROP;
 
 	/* get routing information */
-	if (is_multicast_ether_addr(ethhdr->h_dest)) {
+	if (is_multicast_ether_addr(ethhdr->h_dest))
 		orig_node = batadv_gw_get_selected_orig(bat_priv);
-		if (orig_node)
-			goto find_router;
-	}
+	else
+		/* check for tt host - increases orig_node refcount.
+		 * returns NULL in case of AP isolation
+		 */
+		orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
+						     ethhdr->h_dest);
 
-	/* check for tt host - increases orig_node refcount.
-	 * returns NULL in case of AP isolation
-	 */
-	orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
-					     ethhdr->h_dest);
-
-find_router:
-	/* find_router():
-	 *  - if orig_node is NULL it returns NULL
-	 *  - increases neigh_nodes refcount if found.
-	 */
-	neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
-
-	if (!neigh_node)
+	if (!orig_node)
 		goto out;
 
 	switch (packet_type) {
@@ -305,8 +294,6 @@ find_router:
 		ret = 0;
 
 out:
-	if (neigh_node)
-		batadv_neigh_node_free_ref(neigh_node);
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
 	if (ret == NET_RX_DROP)
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 14/16] batman-adv: implement batadv_tt_entries
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:22   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <antonio@open-mesh.com>

Implement batadv_tt_entries() to get the number of entries
fitting in a given amount of bytes. This computation is done
several times in the code and therefore it is useful to have
an helper function.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 34fa6cc..58636a7 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -232,6 +232,17 @@ static int batadv_tt_len(int changes_num)
 	return changes_num * sizeof(struct batadv_tvlv_tt_change);
 }
 
+/**
+ * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
+ * @tt_len: available space
+ *
+ * Returns the number of entries.
+ */
+static uint16_t batadv_tt_entries(uint16_t tt_len)
+{
+	return tt_len / batadv_tt_len(1);
+}
+
 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 {
 	if (bat_priv->tt.local_hash)
@@ -406,7 +417,7 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 	if (tt_diff_len == 0)
 		goto container_register;
 
-	tt_diff_entries_num = tt_diff_len / batadv_tt_len(1);
+	tt_diff_entries_num = batadv_tt_entries(tt_diff_len);
 
 	spin_lock_bh(&bat_priv->tt.changes_list_lock);
 	atomic_set(&bat_priv->tt.local_changes, 0);
@@ -1616,7 +1627,7 @@ batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
 		tt_len -= tt_len % sizeof(struct batadv_tvlv_tt_change);
 	}
 
-	tt_tot = tt_len / sizeof(struct batadv_tvlv_tt_change);
+	tt_tot = batadv_tt_entries(tt_len);
 
 	tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len,
 			       GFP_ATOMIC);
@@ -2567,7 +2578,7 @@ static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
 	tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
 	tvlv_value_len -= sizeof(*tt_data);
 
-	num_entries = tvlv_value_len / batadv_tt_len(1);
+	num_entries = batadv_tt_entries(tvlv_value_len);
 
 	batadv_tt_update_orig(bat_priv, orig,
 			      (unsigned char *)(tt_data + 1),
@@ -2602,7 +2613,7 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
 	tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
 	tvlv_value_len -= sizeof(*tt_data);
 
-	num_entries = tvlv_value_len / batadv_tt_len(1);
+	num_entries = batadv_tt_entries(tvlv_value_len);
 
 	switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
 	case BATADV_TT_REQUEST:
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 14/16] batman-adv: implement batadv_tt_entries
@ 2013-10-13 11:22   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:22 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <antonio@open-mesh.com>

Implement batadv_tt_entries() to get the number of entries
fitting in a given amount of bytes. This computation is done
several times in the code and therefore it is useful to have
an helper function.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 34fa6cc..58636a7 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -232,6 +232,17 @@ static int batadv_tt_len(int changes_num)
 	return changes_num * sizeof(struct batadv_tvlv_tt_change);
 }
 
+/**
+ * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
+ * @tt_len: available space
+ *
+ * Returns the number of entries.
+ */
+static uint16_t batadv_tt_entries(uint16_t tt_len)
+{
+	return tt_len / batadv_tt_len(1);
+}
+
 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 {
 	if (bat_priv->tt.local_hash)
@@ -406,7 +417,7 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 	if (tt_diff_len == 0)
 		goto container_register;
 
-	tt_diff_entries_num = tt_diff_len / batadv_tt_len(1);
+	tt_diff_entries_num = batadv_tt_entries(tt_diff_len);
 
 	spin_lock_bh(&bat_priv->tt.changes_list_lock);
 	atomic_set(&bat_priv->tt.local_changes, 0);
@@ -1616,7 +1627,7 @@ batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
 		tt_len -= tt_len % sizeof(struct batadv_tvlv_tt_change);
 	}
 
-	tt_tot = tt_len / sizeof(struct batadv_tvlv_tt_change);
+	tt_tot = batadv_tt_entries(tt_len);
 
 	tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len,
 			       GFP_ATOMIC);
@@ -2567,7 +2578,7 @@ static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
 	tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
 	tvlv_value_len -= sizeof(*tt_data);
 
-	num_entries = tvlv_value_len / batadv_tt_len(1);
+	num_entries = batadv_tt_entries(tvlv_value_len);
 
 	batadv_tt_update_orig(bat_priv, orig,
 			      (unsigned char *)(tt_data + 1),
@@ -2602,7 +2613,7 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
 	tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
 	tvlv_value_len -= sizeof(*tt_data);
 
-	num_entries = tvlv_value_len / batadv_tt_len(1);
+	num_entries = batadv_tt_entries(tvlv_value_len);
 
 	switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
 	case BATADV_TT_REQUEST:
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 15/16] batman-adv: make batadv_tt_save_orig_buffer() generic
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:23   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:23 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Antonio Quartulli, Marek Lindner

From: Antonio Quartulli <antonio@open-mesh.com>

This is a simple batadv_tt_save_orig_buffer() refactoring
aiming to make it more generic and avoid useless casts.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 58636a7..b521afb 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -1496,11 +1496,9 @@ static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
 
 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
 				       struct batadv_orig_node *orig_node,
-				       const unsigned char *tt_buff,
-				       uint16_t tt_num_changes)
+				       const void *tt_buff,
+				       uint16_t tt_buff_len)
 {
-	uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
-
 	/* Replace the old buffer only if I received something in the
 	 * last OGM (the OGM could carry no changes)
 	 */
@@ -2037,8 +2035,8 @@ static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
 	_batadv_tt_update_changes(bat_priv, orig_node, tt_change,
 				  tt_num_changes, ttvn);
 
-	batadv_tt_save_orig_buffer(bat_priv, orig_node,
-				   (unsigned char *)tt_change, tt_num_changes);
+	batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
+				   batadv_tt_len(tt_num_changes));
 	atomic_set(&orig_node->last_ttvn, ttvn);
 }
 
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 15/16] batman-adv: make batadv_tt_save_orig_buffer() generic
@ 2013-10-13 11:23   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:23 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Antonio Quartulli <antonio@open-mesh.com>

This is a simple batadv_tt_save_orig_buffer() refactoring
aiming to make it more generic and avoid useless casts.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---
 net/batman-adv/translation-table.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 58636a7..b521afb 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -1496,11 +1496,9 @@ static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
 
 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
 				       struct batadv_orig_node *orig_node,
-				       const unsigned char *tt_buff,
-				       uint16_t tt_num_changes)
+				       const void *tt_buff,
+				       uint16_t tt_buff_len)
 {
-	uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
-
 	/* Replace the old buffer only if I received something in the
 	 * last OGM (the OGM could carry no changes)
 	 */
@@ -2037,8 +2035,8 @@ static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
 	_batadv_tt_update_changes(bat_priv, orig_node, tt_change,
 				  tt_num_changes, ttvn);
 
-	batadv_tt_save_orig_buffer(bat_priv, orig_node,
-				   (unsigned char *)tt_change, tt_num_changes);
+	batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
+				   batadv_tt_len(tt_num_changes));
 	atomic_set(&orig_node->last_ttvn, ttvn);
 }
 
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [PATCH 16/16] batman-adv: Add dummy soft-interface rx mode handler
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-13 11:23   ` Antonio Quartulli
  -1 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:23 UTC (permalink / raw)
  To: davem
  Cc: netdev, b.a.t.m.a.n, Linus Lüssing, Marek Lindner,
	Antonio Quartulli

From: Linus Lüssing <linus.luessing@web.de>

We do not actually need to set any rx filters for the virtual batman
soft interface. However a dummy handler enables a user to set static
multicast listeners for instance.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/soft-interface.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 15c7237..e8a2bd6 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -137,6 +137,18 @@ static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 	return 0;
 }
 
+/**
+ * batadv_interface_set_rx_mode - set the rx mode of a device
+ * @dev: registered network device to modify
+ *
+ * We do not actually need to set any rx filters for the virtual batman
+ * soft interface. However a dummy handler enables a user to set static
+ * multicast listeners for instance.
+ */
+static void batadv_interface_set_rx_mode(struct net_device *dev)
+{
+}
+
 static int batadv_interface_tx(struct sk_buff *skb,
 			       struct net_device *soft_iface)
 {
@@ -583,6 +595,7 @@ static const struct net_device_ops batadv_netdev_ops = {
 	.ndo_get_stats = batadv_interface_stats,
 	.ndo_set_mac_address = batadv_interface_set_mac_addr,
 	.ndo_change_mtu = batadv_interface_change_mtu,
+	.ndo_set_rx_mode = batadv_interface_set_rx_mode,
 	.ndo_start_xmit = batadv_interface_tx,
 	.ndo_validate_addr = eth_validate_addr,
 	.ndo_add_slave = batadv_softif_slave_add,
-- 
1.8.3.2

^ permalink raw reply related	[flat|nested] 36+ messages in thread
* [B.A.T.M.A.N.] [PATCH 16/16] batman-adv: Add dummy soft-interface rx mode handler
@ 2013-10-13 11:23   ` Antonio Quartulli
  0 siblings, 0 replies; 36+ messages in thread
From: Antonio Quartulli @ 2013-10-13 11:23 UTC (permalink / raw)
  To: davem; +Cc: netdev, b.a.t.m.a.n, Marek Lindner, Antonio Quartulli

From: Linus Lüssing <linus.luessing@web.de>

We do not actually need to set any rx filters for the virtual batman
soft interface. However a dummy handler enables a user to set static
multicast listeners for instance.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
 net/batman-adv/soft-interface.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 15c7237..e8a2bd6 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -137,6 +137,18 @@ static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 	return 0;
 }
 
+/**
+ * batadv_interface_set_rx_mode - set the rx mode of a device
+ * @dev: registered network device to modify
+ *
+ * We do not actually need to set any rx filters for the virtual batman
+ * soft interface. However a dummy handler enables a user to set static
+ * multicast listeners for instance.
+ */
+static void batadv_interface_set_rx_mode(struct net_device *dev)
+{
+}
+
 static int batadv_interface_tx(struct sk_buff *skb,
 			       struct net_device *soft_iface)
 {
@@ -583,6 +595,7 @@ static const struct net_device_ops batadv_netdev_ops = {
 	.ndo_get_stats = batadv_interface_stats,
 	.ndo_set_mac_address = batadv_interface_set_mac_addr,
 	.ndo_change_mtu = batadv_interface_change_mtu,
+	.ndo_set_rx_mode = batadv_interface_set_rx_mode,
 	.ndo_start_xmit = batadv_interface_tx,
 	.ndo_validate_addr = eth_validate_addr,
 	.ndo_add_slave = batadv_softif_slave_add,
-- 
1.8.3.2


^ permalink raw reply related	[flat|nested] 36+ messages in thread
* Re: pull request: batman-adv 2013-10-13
  2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
@ 2013-10-17 18:27   ` David Miller
  -1 siblings, 0 replies; 36+ messages in thread
From: David Miller @ 2013-10-17 18:27 UTC (permalink / raw)
  To: antonio; +Cc: netdev, b.a.t.m.a.n

From: Antonio Quartulli <antonio@meshcoding.com>
Date: Sun, 13 Oct 2013 13:22:45 +0200

> this is our second pull request intended for net-next/linux-3.13.
> 
> The most important piece in this patchset is the new packet fragmentation code
> implemented by Martin Hundebøll during his Google Summer of Code 2012[1]. This
> code is entirely substituting the current fragmentation mechanism.
> 
> Other than this you have:
> - the creation of a common BAT ICMP header which makes the ICMP subsystem more
>   flexible and extensible
> - the addition of a dummy rx mode handler for the soft-interface which allows
>   users to set static multicast listeners
> - some minor improvements and code cleanups
> 
> 
> Please pull or let me know of any problem.

Pulled, thanks Antonio.

^ permalink raw reply	[flat|nested] 36+ messages in thread
* Re: [B.A.T.M.A.N.] pull request: batman-adv 2013-10-13
@ 2013-10-17 18:27   ` David Miller
  0 siblings, 0 replies; 36+ messages in thread
From: David Miller @ 2013-10-17 18:27 UTC (permalink / raw)
  To: antonio; +Cc: netdev, b.a.t.m.a.n

From: Antonio Quartulli <antonio@meshcoding.com>
Date: Sun, 13 Oct 2013 13:22:45 +0200

> this is our second pull request intended for net-next/linux-3.13.
> 
> The most important piece in this patchset is the new packet fragmentation code
> implemented by Martin Hundebøll during his Google Summer of Code 2012[1]. This
> code is entirely substituting the current fragmentation mechanism.
> 
> Other than this you have:
> - the creation of a common BAT ICMP header which makes the ICMP subsystem more
>   flexible and extensible
> - the addition of a dummy rx mode handler for the soft-interface which allows
>   users to set static multicast listeners
> - some minor improvements and code cleanups
> 
> 
> Please pull or let me know of any problem.

Pulled, thanks Antonio.

^ permalink raw reply	[flat|nested] 36+ messages in thread
end of thread, other threads:[~2013-10-17 18:27 UTC | newest]

Thread overview: 36+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-10-13 11:22 pull request: batman-adv 2013-10-13 Antonio Quartulli
2013-10-13 11:22 ` [B.A.T.M.A.N.] " Antonio Quartulli
     [not found] ` <1381663381-626-1-git-send-email-antonio-x4xJYDvStAgysxA8WJXlww@public.gmane.org>
2013-10-13 11:22   ` [PATCH 01/16] batman-adv: only add recordroute information to icmp request/reply Antonio Quartulli
2013-10-13 11:22     ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 02/16] batman-adv: make tt_global_add static and return bool Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 03/16] batman-adv: remove batadv_tt_global_add_orig declaration Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 04/16] batman-adv: don't use call_rcu if not needed Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 05/16] batman-adv: h_vlan_encapsulated_proto access refactoring Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 06/16] batman-adv: use VLAN_ETH_HLEN instead of sizeof(struct vlan_eth_hdr) Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 07/16] batman-adv: Remove old fragmentation code Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 08/16] batman-adv: Receive fragmented packets and merge Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 09/16] batman-adv: Fragment and send skbs larger than mtu Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 10/16] batman-adv: use htons when possible Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 11/16] batman-adv: create common header for ICMP packets Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 12/16] batman-adv: consider network coding overhead when calculating required mtu Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 13/16] batman-adv: remove useless find_router look up Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:22 ` [PATCH 14/16] batman-adv: implement batadv_tt_entries Antonio Quartulli
2013-10-13 11:22   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:23 ` [PATCH 15/16] batman-adv: make batadv_tt_save_orig_buffer() generic Antonio Quartulli
2013-10-13 11:23   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-13 11:23 ` [PATCH 16/16] batman-adv: Add dummy soft-interface rx mode handler Antonio Quartulli
2013-10-13 11:23   ` [B.A.T.M.A.N.] " Antonio Quartulli
2013-10-17 18:27 ` pull request: batman-adv 2013-10-13 David Miller
2013-10-17 18:27   ` [B.A.T.M.A.N.] " David Miller

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