[PATCH v3 net] Fixed updating of ethertype in function skb_mpls_pop

[PATCH v3 net] Fixed updating of ethertype in function skb_mpls_pop

[Martin Varghese]

From: Martin Varghese <martin.varghese@nokia.com>

The skb_mpls_pop was not updating ethertype of an ethernet packet if the
packet was originally received from a non ARPHRD_ETHER device.

In the below OVS data path flow, since the device corresponding to port 7
is an l3 device (ARPHRD_NONE) the skb_mpls_pop function does not update
the ethertype of the packet even though the previous push_eth action had
added an ethernet header to the packet.

recirc_id(0),in_port(7),eth_type(0x8847),
mpls(label=12/0xfffff,tc=0/0,ttl=0/0x0,bos=1/1),
actions:push_eth(src=00:00:00:00:00:00,dst=00:00:00:00:00:00),
pop_mpls(eth_type=0x800),4

Fixes: ed246cee09b9 ("net: core: move pop MPLS functionality from OvS to core helper")
Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
---
Changes in v2:
    - In function skb_mpls_pop check for dev type removed
      while updating ethertype.
    - key->mac_proto is checked in function pop_mpls to pass
      ethernet flag to skb_mpls_pop.
    - dev type is checked in function tcf_mpls_act to pass
      ethernet flag to skb_mpls_pop.

Changes in v3:
    - Fixed header inclusion order.
    - Removed unwanted braces.
    - Retain space between function argements and description in the
      coments of function skb_mpls_pop.
    - used ovs_key_mac_proto(key) to check if the packet is ethernet.
    - Added fixes tag.

 include/linux/skbuff.h    | 3 ++-
 net/core/skbuff.c         | 6 ++++--
 net/openvswitch/actions.c | 3 ++-
 net/sched/act_mpls.c      | 4 +++-
 4 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index dfe02b6..70204b9 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3530,7 +3530,8 @@ int skb_zerocopy(struct sk_buff *to, struct sk_buff *from,
 int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci);
 int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto,
 		  int mac_len);
-int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len);
+int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len,
+		 bool ethernet);
 int skb_mpls_update_lse(struct sk_buff *skb, __be32 mpls_lse);
 int skb_mpls_dec_ttl(struct sk_buff *skb);
 struct sk_buff *pskb_extract(struct sk_buff *skb, int off, int to_copy,
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 867e61d..312e80e 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5529,12 +5529,14 @@ int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto,
  * @skb: buffer
  * @next_proto: ethertype of header after popped MPLS header
  * @mac_len: length of the MAC header
+ * @ethernet: flag to indicate if ethernet header is present in packet
  *
  * Expects skb->data at mac header.
  *
  * Returns 0 on success, -errno otherwise.
  */
-int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len)
+int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len,
+		 bool ethernet)
 {
 	int err;
 
@@ -5553,7 +5555,7 @@ int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len)
 	skb_reset_mac_header(skb);
 	skb_set_network_header(skb, mac_len);
 
-	if (skb->dev && skb->dev->type == ARPHRD_ETHER) {
+	if (ethernet) {
 		struct ethhdr *hdr;
 
 		/* use mpls_hdr() to get ethertype to account for VLANs. */
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 12936c1..91e2100 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -179,7 +179,8 @@ static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
 {
 	int err;
 
-	err = skb_mpls_pop(skb, ethertype, skb->mac_len);
+	err = skb_mpls_pop(skb, ethertype, skb->mac_len,
+			   ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET);
 	if (err)
 		return err;
 
diff --git a/net/sched/act_mpls.c b/net/sched/act_mpls.c
index 4d8c822..47e0cfd 100644
--- a/net/sched/act_mpls.c
+++ b/net/sched/act_mpls.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright (C) 2019 Netronome Systems, Inc. */
 
+#include <linux/if_arp.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -76,7 +77,8 @@ static int tcf_mpls_act(struct sk_buff *skb, const struct tc_action *a,
 
 	switch (p->tcfm_action) {
 	case TCA_MPLS_ACT_POP:
-		if (skb_mpls_pop(skb, p->tcfm_proto, mac_len))
+		if (skb_mpls_pop(skb, p->tcfm_proto, mac_len,
+				 skb->dev && skb->dev->type == ARPHRD_ETHER))
 			goto drop;
 		break;
 	case TCA_MPLS_ACT_PUSH:
-- 
1.8.3.1

Re: [PATCH v3 net] Fixed updating of ethertype in function skb_mpls_pop

[Pravin Shelar]

On Sun, Dec 1, 2019 at 9:20 PM Martin Varghese
<martinvarghesenokia@gmail.com> wrote:
>
> From: Martin Varghese <martin.varghese@nokia.com>
>
> The skb_mpls_pop was not updating ethertype of an ethernet packet if the
> packet was originally received from a non ARPHRD_ETHER device.
>
> In the below OVS data path flow, since the device corresponding to port 7
> is an l3 device (ARPHRD_NONE) the skb_mpls_pop function does not update
> the ethertype of the packet even though the previous push_eth action had
> added an ethernet header to the packet.
>
> recirc_id(0),in_port(7),eth_type(0x8847),
> mpls(label=12/0xfffff,tc=0/0,ttl=0/0x0,bos=1/1),
> actions:push_eth(src=00:00:00:00:00:00,dst=00:00:00:00:00:00),
> pop_mpls(eth_type=0x800),4
>
> Fixes: ed246cee09b9 ("net: core: move pop MPLS functionality from OvS to core helper")
> Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
> ---
> Changes in v2:
>     - In function skb_mpls_pop check for dev type removed
>       while updating ethertype.
>     - key->mac_proto is checked in function pop_mpls to pass
>       ethernet flag to skb_mpls_pop.
>     - dev type is checked in function tcf_mpls_act to pass
>       ethernet flag to skb_mpls_pop.
>
> Changes in v3:
>     - Fixed header inclusion order.
>     - Removed unwanted braces.
>     - Retain space between function argements and description in the
>       coments of function skb_mpls_pop.
>     - used ovs_key_mac_proto(key) to check if the packet is ethernet.
>     - Added fixes tag.
>
Acked-by: Pravin B Shelar <pshelar@ovn.org>

Re: [PATCH v3 net] Fixed updating of ethertype in function skb_mpls_pop

[David Miller]

From: Martin Varghese <martinvarghesenokia@gmail.com>
Date: Mon,  2 Dec 2019 10:49:51 +0530

> From: Martin Varghese <martin.varghese@nokia.com>
> 
> The skb_mpls_pop was not updating ethertype of an ethernet packet if the
> packet was originally received from a non ARPHRD_ETHER device.
> 
> In the below OVS data path flow, since the device corresponding to port 7
> is an l3 device (ARPHRD_NONE) the skb_mpls_pop function does not update
> the ethertype of the packet even though the previous push_eth action had
> added an ethernet header to the packet.
> 
> recirc_id(0),in_port(7),eth_type(0x8847),
> mpls(label=12/0xfffff,tc=0/0,ttl=0/0x0,bos=1/1),
> actions:push_eth(src=00:00:00:00:00:00,dst=00:00:00:00:00:00),
> pop_mpls(eth_type=0x800),4
> 
> Fixes: ed246cee09b9 ("net: core: move pop MPLS functionality from OvS to core helper")
> Signed-off-by: Martin Varghese <martin.varghese@nokia.com>

Applied and queued up for -stable, thanks.