From 0ea9d5e3e0e03a63b11392f5613378977dae7eca Mon Sep 17 00:00:00 2001 From: Hannes Frederic Sowa Date: Tue, 13 Aug 2013 04:35:58 +0200 Subject: 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 Signed-off-by: Hannes Frederic Sowa Signed-off-by: Steffen Klassert --- include/net/route.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/net/route.h') 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 */ -- cgit v1.2.3