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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-08-13 04:35:58 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2013-08-14 13:09:07 +0200
commit0ea9d5e3e0e03a63b11392f5613378977dae7eca (patch)
treea363333080f9f8647f3f80dc7e736a308c36b7cb /include/net/route.h
parent628e341f319f1a64a4639088faba952e4ec8f0a8 (diff)
downloadlinux-0ea9d5e3e0e03a63b11392f5613378977dae7eca.tar.bz2
xfrm: introduce helper for safe determination of mtu
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>
Diffstat (limited to 'include/net/route.h')
-rw-r--r--include/net/route.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/route.h b/include/net/route.h
index 2ea40c1b5e00..afdeeb5bec25 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -317,4 +317,12 @@ static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
return hoplimit;
}
+static inline int ip_skb_dst_mtu(struct sk_buff *skb)
+{
+ struct inet_sock *inet = skb->sk ? inet_sk(skb->sk) : NULL;
+
+ return (inet && inet->pmtudisc == IP_PMTUDISC_PROBE) ?
+ skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
+}
+
#endif /* _ROUTE_H */