path: root/net/ipv4/xfrm4_output.c
diff options
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 /net/ipv4/xfrm4_output.c
parentxfrm: make local error reporting more robust (diff)
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 'net/ipv4/xfrm4_output.c')
1 files changed, 1 insertions, 3 deletions
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 7a5491ffa4de..80baf4a3b1b5 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -21,7 +21,6 @@
static int xfrm4_tunnel_check_size(struct sk_buff *skb)
int mtu, ret = 0;
- struct dst_entry *dst;
if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
goto out;
@@ -29,8 +28,7 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb)
if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->local_df)
goto out;
- dst = skb_dst(skb);
- mtu = dst_mtu(dst);
+ mtu = xfrm_skb_dst_mtu(skb);
if (skb->len > mtu) {
if (skb->sk)
xfrm_local_error(skb, mtu);