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Subject[PATCH 5.4 26/37] net: Fixed updating of ethertype in skb_mpls_push()
Date
From: Martin Varghese <martin.varghese@nokia.com>

[ Upstream commit d04ac224b1688f005a84f764cfe29844f8e9da08 ]

The skb_mpls_push 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_push 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(0x0800),ipv4(tos=0/0xfc,ttl=64,frag=no),
actions:push_eth(src=00:00:00:00:00:00,dst=00:00:00:00:00:00),
push_mpls(label=13,tc=0,ttl=64,bos=1,eth_type=0x8847),4

Fixes: 8822e270d697 ("net: core: move push MPLS functionality from OvS to core helper")
Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/linux/skbuff.h | 2 +-
net/core/skbuff.c | 4 ++--
net/openvswitch/actions.c | 3 ++-
net/sched/act_mpls.c | 3 ++-
4 files changed, 7 insertions(+), 5 deletions(-)

--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3527,7 +3527,7 @@ int __skb_vlan_pop(struct sk_buff *skb,
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 mac_len, bool ethernet);
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);
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5484,7 +5484,7 @@ static void skb_mod_eth_type(struct sk_b
* Returns 0 on success, -errno otherwise.
*/
int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto,
- int mac_len)
+ int mac_len, bool ethernet)
{
struct mpls_shim_hdr *lse;
int err;
@@ -5515,7 +5515,7 @@ int skb_mpls_push(struct sk_buff *skb, _
lse->label_stack_entry = mpls_lse;
skb_postpush_rcsum(skb, lse, MPLS_HLEN);

- if (skb->dev && skb->dev->type == ARPHRD_ETHER)
+ if (ethernet)
skb_mod_eth_type(skb, eth_hdr(skb), mpls_proto);
skb->protocol = mpls_proto;

--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -166,7 +166,8 @@ static int push_mpls(struct sk_buff *skb
int err;

err = skb_mpls_push(skb, mpls->mpls_lse, mpls->mpls_ethertype,
- skb->mac_len);
+ 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
@@ -83,7 +83,8 @@ static int tcf_mpls_act(struct sk_buff *
break;
case TCA_MPLS_ACT_PUSH:
new_lse = tcf_mpls_get_lse(NULL, p, !eth_p_mpls(skb->protocol));
- if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len))
+ if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len,
+ skb->dev && skb->dev->type == ARPHRD_ETHER))
goto drop;
break;
case TCA_MPLS_ACT_MODIFY:

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