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authorPatrick McHardy <kaber@trash.net>2006-02-16 02:10:22 +0300
committerDavid S. Miller <davem@davemloft.net>2006-02-16 02:10:22 +0300
commit48d5cad87c3a4998d0bda16ccfb5c60dfe4de5fb (patch)
treebfad91af72f4c522a44bab6133b540cda365d8c1 /net/ipv4/xfrm4_output.c
parent5ecfbae093f0c37311e89b29bfc0c9d586eace87 (diff)
downloadlinux-48d5cad87c3a4998d0bda16ccfb5c60dfe4de5fb.tar.xz
[XFRM]: Fix SNAT-related crash in xfrm4_output_finish
When a packet matching an IPsec policy is SNATed so it doesn't match any policy anymore it looses its xfrm bundle, which makes xfrm4_output_finish crash because of a NULL pointer dereference. This patch directs these packets to the original output path instead. Since the packets have already passed the POST_ROUTING hook, but need to start at the beginning of the original output path which includes another POST_ROUTING invocation, a flag is added to the IPCB to indicate that the packet was rerouted and doesn't need to pass the POST_ROUTING hook again. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_output.c')
-rw-r--r--net/ipv4/xfrm4_output.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index d4df0ddd424b..32ad229b4fed 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -152,10 +152,16 @@ error_nolock:
goto out_exit;
}
-int xfrm4_output_finish(struct sk_buff *skb)
+static int xfrm4_output_finish(struct sk_buff *skb)
{
int err;
+#ifdef CONFIG_NETFILTER
+ if (!skb->dst->xfrm) {
+ IPCB(skb)->flags |= IPSKB_REROUTED;
+ return dst_output(skb);
+ }
+#endif
while (likely((err = xfrm4_output_one(skb)) == 0)) {
nf_reset(skb);
@@ -178,6 +184,7 @@ int xfrm4_output_finish(struct sk_buff *skb)
int xfrm4_output(struct sk_buff *skb)
{
- return NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL, skb->dst->dev,
- xfrm4_output_finish);
+ return NF_HOOK_COND(PF_INET, NF_IP_POST_ROUTING, skb, NULL, skb->dst->dev,
+ xfrm4_output_finish,
+ !(IPCB(skb)->flags & IPSKB_REROUTED));
}