lkml.org 
[lkml]   [2019]   [Dec]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.3 20/25] Fixed updating of ethertype in function skb_mpls_pop
Date
From: Martin Varghese <martin.varghese@nokia.com>

[ Upstream commit 040b5cfbcefa263ccf2c118c4938308606bb7ed8 ]

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>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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(-)

--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3483,7 +3483,8 @@ int skb_vlan_pop(struct sk_buff *skb);
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,
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5517,12 +5517,14 @@ EXPORT_SYMBOL_GPL(skb_mpls_push);
* @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;

@@ -5541,7 +5543,7 @@ int skb_mpls_pop(struct sk_buff *skb, __
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. */
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -179,7 +179,8 @@ static int pop_mpls(struct sk_buff *skb,
{
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;

--- 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 *

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:

\
 
 \ /
  Last update: 2019-12-17 21:19    [W:0.097 / U:4.764 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site