From 844d48746e4b281a933aedc0428048a1219b42f4 Mon Sep 17 00:00:00 2001 From: Hannes Frederic Sowa Date: Sun, 18 Aug 2013 13:47:01 +0200 Subject: [PATCH] xfrm: choose protocol family by skb protocol We need to choose the protocol family by skb->protocol. Otherwise we call the wrong xfrm{4,6}_local_error handler in case an ipv6 sockets is used in ipv4 mode, in which case we should call down to xfrm4_local_error (ip6 sockets are a superset of ip4 ones). We are called before before ip_output functions, so skb->protocol is not reset. Cc: Steffen Klassert Acked-by: Eric Dumazet Signed-off-by: Hannes Frederic Sowa Signed-off-by: Steffen Klassert --- include/net/xfrm.h | 4 ++-- net/xfrm/xfrm_output.c | 10 +++++++++- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index b41d2d1..ac5b025 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -1728,9 +1728,9 @@ static inline int xfrm_skb_dst_mtu(struct sk_buff *skb) { struct sock *sk = skb->sk; - if (sk && sk->sk_family == AF_INET6) + if (sk && skb->protocol == htons(ETH_P_IPV6)) return ip6_skb_dst_mtu(skb); - else if (sk && sk->sk_family == AF_INET) + else if (sk && skb->protocol == htons(ETH_P_IP)) return ip_skb_dst_mtu(skb); return dst_mtu(skb_dst(skb)); } diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c index 6f5fc61..3bb2cdc 100644 --- a/net/xfrm/xfrm_output.c +++ b/net/xfrm/xfrm_output.c @@ -216,9 +216,17 @@ int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) void xfrm_local_error(struct sk_buff *skb, int mtu) { + unsigned int proto; struct xfrm_state_afinfo *afinfo; - afinfo = xfrm_state_get_afinfo(skb->sk->sk_family); + if (skb->protocol == htons(ETH_P_IP)) + proto = AF_INET; + else if (skb->protocol == htons(ETH_P_IPV6)) + proto = AF_INET6; + else + return; + + afinfo = xfrm_state_get_afinfo(proto); if (!afinfo) return; -- 2.7.4