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xfrm: introduce helper for safe determination of mtu

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skb->sk socket can be of AF_INET or AF_INET6 address family. Thus we
always have to make sure we a referring to the correct interpretation
of skb->sk.

We only depend on header defines to query the mtu, so we don't introduce
a new dependency to ipv6 by this change.

Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Hannes Frederic Sowa
2013-08-13 04:35:58 +02:00
committed by Steffen Klassert
parent 628e341f31
commit 0ea9d5e3e0
5 changed files with 25 additions and 12 deletions
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5
net/ipv6/xfrm6_output.c
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@@ -138,7 +138,10 @@ static int __xfrm6_output(struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
struct xfrm_state *x = dst->xfrm;
int mtu = ip6_skb_dst_mtu(skb);
int mtu = xfrm_skb_dst_mtu(skb);
if (mtu < IPV6_MIN_MTU)
mtu = IPV6_MIN_MTU;
if (skb->len > mtu && xfrm6_local_dontfrag(skb)) {
xfrm6_local_rxpmtu(skb, mtu);