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authorPatrick McHardy <kaber@trash.net>2006-02-15 15:10:22 -0800
committerDavid S. Miller <davem@davemloft.net>2006-02-15 15:10:22 -0800
commit48d5cad87c3a4998d0bda16ccfb5c60dfe4de5fb (patch)
treebfad91af72f4c522a44bab6133b540cda365d8c1 /include/linux
parent5ecfbae093f0c37311e89b29bfc0c9d586eace87 (diff)
[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 'include/linux')
-rw-r--r--include/linux/netfilter.h19
1 files changed, 15 insertions, 4 deletions
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 4cf6088625c..3ca3d9ee78a 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -184,8 +184,11 @@ static inline int nf_hook_thresh(int pf, unsigned int hook,
struct sk_buff **pskb,
struct net_device *indev,
struct net_device *outdev,
- int (*okfn)(struct sk_buff *), int thresh)
+ int (*okfn)(struct sk_buff *), int thresh,
+ int cond)
{
+ if (!cond)
+ return 1;
#ifndef CONFIG_NETFILTER_DEBUG
if (list_empty(&nf_hooks[pf][hook]))
return 1;
@@ -197,7 +200,7 @@ static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
struct net_device *indev, struct net_device *outdev,
int (*okfn)(struct sk_buff *))
{
- return nf_hook_thresh(pf, hook, pskb, indev, outdev, okfn, INT_MIN);
+ return nf_hook_thresh(pf, hook, pskb, indev, outdev, okfn, INT_MIN, 1);
}
/* Activate hook; either okfn or kfree_skb called, unless a hook
@@ -224,7 +227,13 @@ static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
({int __ret; \
-if ((__ret=nf_hook_thresh(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1)\
+if ((__ret=nf_hook_thresh(pf, hook, &(skb), indev, outdev, okfn, thresh, 1)) == 1)\
+ __ret = (okfn)(skb); \
+__ret;})
+
+#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \
+({int __ret; \
+if ((__ret=nf_hook_thresh(pf, hook, &(skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\
__ret = (okfn)(skb); \
__ret;})
@@ -295,11 +304,13 @@ extern struct proc_dir_entry *proc_net_netfilter;
#else /* !CONFIG_NETFILTER */
#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
+#define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
static inline int nf_hook_thresh(int pf, unsigned int hook,
struct sk_buff **pskb,
struct net_device *indev,
struct net_device *outdev,
- int (*okfn)(struct sk_buff *), int thresh)
+ int (*okfn)(struct sk_buff *), int thresh,
+ int cond)
{
return okfn(*pskb);
}