[PATCH 0/3] pull request for net-next: batman-adv 2022-01-03

[PATCH 0/3] pull request for net-next: batman-adv 2022-01-03

[Simon Wunderlich]

Hi Jakub, hi David,

here is a little cleanup pull request of batman-adv to go into net-next.

Please pull or let me know of any problem!

Thank you,
      Simon

The following changes since commit 66f4beaa6c1d28161f534471484b2daa2de1dce0:

  Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 (2021-11-12 12:35:46 -0800)

are available in the Git repository at:

  git://git.open-mesh.org/linux-merge.git tags/batadv-next-pullrequest-20220103

for you to fetch changes up to cde3fac565a7df8805a4e0e28d84a0f90177099a:

  batman-adv: remove unneeded variable in batadv_nc_init (2021-12-10 08:52:52 +0100)

----------------------------------------------------------------
This cleanup patchset includes the following patches:

 - bump version strings, by Simon Wunderlich

 - allow netlink usage in unprivileged containers, by Linus Lüssing

 - remove unneeded variable, by Minghao Chi

----------------------------------------------------------------
Linus Lüssing (1):
      batman-adv: allow netlink usage in unprivileged containers

Minghao Chi (1):
      batman-adv: remove unneeded variable in batadv_nc_init

Simon Wunderlich (1):
      batman-adv: Start new development cycle

 net/batman-adv/main.h           |  2 +-
 net/batman-adv/netlink.c        | 30 +++++++++++++++---------------
 net/batman-adv/network-coding.c |  8 ++------
 3 files changed, 18 insertions(+), 22 deletions(-)

[PATCH 1/3] batman-adv: Start new development cycle

[Simon Wunderlich]

This version will contain all the (major or even only minor) changes for
Linux 5.17.

The version number isn't a semantic version number with major and minor
information. It is just encoding the year of the expected publishing as
Linux -rc1 and the number of published versions this year (starting at 0).

Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/main.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 058b8f2eef65..494d1ebecac2 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -13,7 +13,7 @@
 #define BATADV_DRIVER_DEVICE "batman-adv"
 
 #ifndef BATADV_SOURCE_VERSION
-#define BATADV_SOURCE_VERSION "2021.3"
+#define BATADV_SOURCE_VERSION "2022.0"
 #endif
 
 /* B.A.T.M.A.N. parameters */
-- 
2.30.2

[PATCH 2/3] batman-adv: allow netlink usage in unprivileged containers

[Simon Wunderlich]

From: Linus Lüssing <linus.luessing@c0d3.blue>

Currently, creating a batman-adv interface in an unprivileged LXD
container and attaching secondary interfaces to it with "ip" or "batctl"
works fine. However all batctl debug and configuration commands
fail:

  root@container:~# batctl originators
  Error received: Operation not permitted
  root@container:~# batctl orig_interval
  1000
  root@container:~# batctl orig_interval 2000
  root@container:~# batctl orig_interval
  1000

To fix this change the generic netlink permissions from GENL_ADMIN_PERM
to GENL_UNS_ADMIN_PERM. This way a batman-adv interface is fully
maintainable as root from within a user namespace, from an unprivileged
container.

All except one batman-adv netlink setting are per interface and do not
leak information or change settings from the host system and are
therefore save to retrieve or modify as root from within an unprivileged
container.

"batctl routing_algo" / BATADV_CMD_GET_ROUTING_ALGOS is the only
exception: It provides the batman-adv kernel module wide default routing
algorithm. However it is read-only from netlink and an unprivileged
container is still not allowed to modify
/sys/module/batman_adv/parameters/routing_algo. Instead it is advised to
use the newly introduced "batctl if create routing_algo RA_NAME" /
IFLA_BATADV_ALGO_NAME to set the routing algorithm on interface
creation, which already works fine in an unprivileged container.

Cc: Tycho Andersen <tycho@tycho.pizza>
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/netlink.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c
index 29276284d281..00875e1d8c44 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -1368,21 +1368,21 @@ static const struct genl_small_ops batadv_netlink_ops[] = {
 	{
 		.cmd = BATADV_CMD_TP_METER,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.doit = batadv_netlink_tp_meter_start,
 		.internal_flags = BATADV_FLAG_NEED_MESH,
 	},
 	{
 		.cmd = BATADV_CMD_TP_METER_CANCEL,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.doit = batadv_netlink_tp_meter_cancel,
 		.internal_flags = BATADV_FLAG_NEED_MESH,
 	},
 	{
 		.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_algo_dump,
 	},
 	{
@@ -1397,68 +1397,68 @@ static const struct genl_small_ops batadv_netlink_ops[] = {
 	{
 		.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_tt_local_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_tt_global_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_ORIGINATORS,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_orig_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_NEIGHBORS,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_hardif_neigh_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_GATEWAYS,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_gw_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_BLA_CLAIM,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_bla_claim_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_BLA_BACKBONE,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_bla_backbone_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_DAT_CACHE,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_dat_cache_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_MCAST_FLAGS,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.dumpit = batadv_mcast_flags_dump,
 	},
 	{
 		.cmd = BATADV_CMD_SET_MESH,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.doit = batadv_netlink_set_mesh,
 		.internal_flags = BATADV_FLAG_NEED_MESH,
 	},
 	{
 		.cmd = BATADV_CMD_SET_HARDIF,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.doit = batadv_netlink_set_hardif,
 		.internal_flags = BATADV_FLAG_NEED_MESH |
 				  BATADV_FLAG_NEED_HARDIF,
@@ -1474,7 +1474,7 @@ static const struct genl_small_ops batadv_netlink_ops[] = {
 	{
 		.cmd = BATADV_CMD_SET_VLAN,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-		.flags = GENL_ADMIN_PERM,
+		.flags = GENL_UNS_ADMIN_PERM,
 		.doit = batadv_netlink_set_vlan,
 		.internal_flags = BATADV_FLAG_NEED_MESH |
 				  BATADV_FLAG_NEED_VLAN,
-- 
2.30.2

[PATCH 3/3] batman-adv: remove unneeded variable in batadv_nc_init

[Simon Wunderlich]

From: Minghao Chi <chi.minghao@zte.com.cn>

Return status directly from function called.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/network-coding.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index 0a7f1d36a6a8..974d726fabb9 100644
--- a/net/batman-adv/network-coding.c
+++ b/net/batman-adv/network-coding.c
@@ -58,13 +58,9 @@ static int batadv_nc_recv_coded_packet(struct sk_buff *skb,
  */
 int __init batadv_nc_init(void)
 {
-	int ret;
-
 	/* Register our packet type */
-	ret = batadv_recv_handler_register(BATADV_CODED,
-					   batadv_nc_recv_coded_packet);
-
-	return ret;
+	return batadv_recv_handler_register(BATADV_CODED,
+					    batadv_nc_recv_coded_packet);
 }
 
 /**
-- 
2.30.2

Re: [PATCH 1/3] batman-adv: Start new development cycle

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Simon Wunderlich <sw@simonwunderlich.de>:

On Mon,  3 Jan 2022 18:17:20 +0100 you wrote:
> This version will contain all the (major or even only minor) changes for
> Linux 5.17.
> 
> The version number isn't a semantic version number with major and minor
> information. It is just encoding the year of the expected publishing as
> Linux -rc1 and the number of published versions this year (starting at 0).
> 
> [...]

Here is the summary with links:
  - [1/3] batman-adv: Start new development cycle
    https://git.kernel.org/netdev/net-next/c/c2262123cc49
  - [2/3] batman-adv: allow netlink usage in unprivileged containers
    https://git.kernel.org/netdev/net-next/c/9057d6c23e73
  - [3/3] batman-adv: remove unneeded variable in batadv_nc_init
    https://git.kernel.org/netdev/net-next/c/cde3fac565a7

You are awesome, thank you!
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