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ipv4: add a sock pointer to dst->output() path.

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In the dst->output() path for ipv4, the code assumes the skb it has to
transmit is attached to an inet socket, specifically via
ip_mc_output() : The sk_mc_loop() test triggers a WARN_ON() when the
provider of the packet is an AF_PACKET socket.

The dst->output() method gets an additional 'struct sock *sk'
parameter. This needs a cascade of changes so that this parameter can
be propagated from vxlan to final consumer.

Fixes: 8f646c922d ("vxlan: keep original skb ownership")
Reported-by: lucien xin <lucien.xin@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-04-15 13:47:15 -04:00 • committed by David S. Miller
parent b0270e9101
commit aad88724c9
19 changed files with 74 additions and 46 deletions
Download patch file Download diff file Expand all files Collapse all files

15
net/core/dst.c
View file

@ -142,12 +142,12 @@ loop:
mutex_unlock(&dst_gc_mutex);
}
int dst_discard(struct sk_buff *skb)
int dst_discard_sk(struct sock *sk, struct sk_buff *skb)
{
kfree_skb(skb);
return 0;
}
EXPORT_SYMBOL(dst_discard);
EXPORT_SYMBOL(dst_discard_sk);
const u32 dst_default_metrics[RTAX_MAX + 1] = {
/* This initializer is needed to force linker to place this variable
@ -184,7 +184,7 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
dst->xfrm = NULL;
#endif
dst->input = dst_discard;
dst->output = dst_discard;
dst->output = dst_discard_sk;
dst->error = 0;
dst->obsolete = initial_obsolete;
dst->header_len = 0;
@ -209,8 +209,10 @@ static void ___dst_free(struct dst_entry *dst)
/* The first case (dev==NULL) is required, when
protocol module is unloaded.
*/
if (dst->dev == NULL || !(dst->dev->flags&IFF_UP))
dst->input = dst->output = dst_discard;
if (dst->dev == NULL || !(dst->dev->flags&IFF_UP)) {
dst->input = dst_discard;
dst->output = dst_discard_sk;
}
dst->obsolete = DST_OBSOLETE_DEAD;
}
@ -361,7 +363,8 @@ static void dst_ifdown(struct dst_entry *dst, struct net_device *dev,
return;
if (!unregister) {
dst->input = dst->output = dst_discard;
dst->input = dst_discard;
dst->output = dst_discard_sk;
} else {
dst->dev = dev_net(dst->dev)->loopback_dev;
dev_hold(dst->dev);