diff options
Diffstat (limited to 'net/ipv4/netfilter/ip_nat_standalone.c')
| -rw-r--r-- | net/ipv4/netfilter/ip_nat_standalone.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/ip_nat_standalone.c b/net/ipv4/netfilter/ip_nat_standalone.c index 1bb50897a5a..b518697af4d 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; |