diff options
| author | Patrick McHardy <kaber@trash.net> | 2006-01-07 08:05:36 +0100 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-01-07 21:57:35 +0100 |
| commit | 5c901daaea3be0d900b3ae1fc9b5f64ff94e4f02 (patch) | |
| tree | 7532b280d892bab7fd9af98b02a3f81929ddca5d /net/ipv4 | |
| parent | [NETFILTER]: Use conntrack information to determine if packet was NATed (diff) | |
| download | linux-5c901daaea3be0d900b3ae1fc9b5f64ff94e4f02.tar.xz linux-5c901daaea3be0d900b3ae1fc9b5f64ff94e4f02.zip | |
[NETFILTER]: Redo policy lookups after NAT when neccessary
When NAT changes the key used for the xfrm lookup it needs to be done
again. If a new policy is returned in POST_ROUTING the packet needs
to be passed to xfrm4_output_one manually after all hooks were called
because POST_ROUTING is called with fixed okfn (ip_finish_output).
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_output.c | 5 | ||||
| -rw-r--r-- | net/ipv4/netfilter/ip_nat_standalone.c | 27 | ||||
| -rw-r--r-- | net/ipv4/xfrm4_output.c | 2 |
3 files changed, 31 insertions, 3 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 8b1c9bd0091e..59fdac3a099a 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -202,6 +202,11 @@ static inline int ip_finish_output2(struct sk_buff *skb) static inline int ip_finish_output(struct sk_buff *skb) { +#if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM) + /* Policy lookup after SNAT yielded a new policy */ + if (skb->dst->xfrm != NULL) + return xfrm4_output_finish(skb); +#endif if (skb->len > dst_mtu(skb->dst) && !(skb_shinfo(skb)->ufo_size || skb_shinfo(skb)->tso_size)) return ip_fragment(skb, ip_finish_output2); diff --git a/net/ipv4/netfilter/ip_nat_standalone.c b/net/ipv4/netfilter/ip_nat_standalone.c index 1bb50897a5a2..b518697af4db 100644 --- a/net/ipv4/netfilter/ip_nat_standalone.c +++ b/net/ipv4/netfilter/ip_nat_standalone.c @@ -187,12 +187,30 @@ ip_nat_out(unsigned int hooknum, const struct net_device *out, int (*okfn)(struct sk_buff *)) { + struct ip_conntrack *ct; + enum ip_conntrack_info ctinfo; + unsigned int ret; + /* root is playing with raw sockets. */ if ((*pskb)->len < sizeof(struct iphdr) || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) return NF_ACCEPT; - return ip_nat_fn(hooknum, pskb, in, out, okfn); + ret = ip_nat_fn(hooknum, pskb, in, out, okfn); + if (ret != NF_DROP && ret != NF_STOLEN + && (ct = ip_conntrack_get(*pskb, &ctinfo)) != NULL) { + enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); + + if (ct->tuplehash[dir].tuple.src.ip != + ct->tuplehash[!dir].tuple.dst.ip +#ifdef CONFIG_XFRM + || ct->tuplehash[dir].tuple.src.u.all != + ct->tuplehash[!dir].tuple.dst.u.all +#endif + ) + return ip_route_me_harder(pskb) == 0 ? ret : NF_DROP; + } + return ret; } static unsigned int @@ -217,7 +235,12 @@ ip_nat_local_fn(unsigned int hooknum, enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); if (ct->tuplehash[dir].tuple.dst.ip != - ct->tuplehash[!dir].tuple.src.ip) + ct->tuplehash[!dir].tuple.src.ip +#ifdef CONFIG_XFRM + || ct->tuplehash[dir].tuple.dst.u.all != + ct->tuplehash[dir].tuple.src.u.all +#endif + ) return ip_route_me_harder(pskb) == 0 ? ret : NF_DROP; } return ret; diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c index 160c48800ab8..d4df0ddd424b 100644 --- a/net/ipv4/xfrm4_output.c +++ b/net/ipv4/xfrm4_output.c @@ -152,7 +152,7 @@ error_nolock: goto out_exit; } -static int xfrm4_output_finish(struct sk_buff *skb) +int xfrm4_output_finish(struct sk_buff *skb) { int err; |