From 9c6eb28aca52d562f3ffbaebaa56385df9972a43 Mon Sep 17 00:00:00 2001
From: Jan Engelhardt <jengelh@medozas.de>
Date: Tue, 13 Apr 2010 15:32:16 +0200
Subject: [PATCH] netfilter: ipv6: add IPSKB_REROUTED exclusion to
NF_HOOK/POSTROUTING invocation
Similar to how IPv4's ip_output.c works, have ip6_output also check
the IPSKB_REROUTED flag. It will be set from xt_TEE for cloned packets
since Xtables can currently only deal with a single packet in flight
at a time.
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Acked-by: David S. Miller <davem@davemloft.net>
[Patrick: changed to use an IP6SKB value instead of IPSKB]
Signed-off-by: Patrick McHardy <kaber@trash.net>
---
include/linux/ipv6.h | 1 +
net/ipv6/ip6_output.c | 5 +++--
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index e0cc9a7db2b5..7bdf6ffe2b49 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -250,6 +250,7 @@ struct inet6_skb_parm {
#define IP6SKB_XFRM_TRANSFORMED 1
#define IP6SKB_FORWARDED 2
+#define IP6SKB_REROUTED 4
};
#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 236ac7813744..c10a38a71a5e 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -172,8 +172,9 @@ int ip6_output(struct sk_buff *skb)
return 0;
}
- return NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev,
- ip6_finish_output);
+ return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev,
+ ip6_finish_output,
+ !(IP6CB(skb)->flags & IP6SKB_REROUTED));
}
/*
--
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