netfilter: xt_TCPMSS: lookup route from proper net namespace
Otherwise the pmtu will be incorrect. Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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@ -43,7 +43,8 @@ optlen(const u_int8_t *opt, unsigned int offset)
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return opt[offset+1];
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}
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static u_int32_t tcpmss_reverse_mtu(const struct sk_buff *skb,
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static u_int32_t tcpmss_reverse_mtu(struct net *net,
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const struct sk_buff *skb,
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unsigned int family)
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{
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struct flowi fl;
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@ -64,7 +65,7 @@ static u_int32_t tcpmss_reverse_mtu(const struct sk_buff *skb,
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rcu_read_lock();
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ai = nf_get_afinfo(family);
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if (ai != NULL)
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ai->route(&init_net, (struct dst_entry **)&rt, &fl, false);
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ai->route(net, (struct dst_entry **)&rt, &fl, false);
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rcu_read_unlock();
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if (rt != NULL) {
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@ -107,7 +108,8 @@ tcpmss_mangle_packet(struct sk_buff *skb,
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return -1;
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if (info->mss == XT_TCPMSS_CLAMP_PMTU) {
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unsigned int in_mtu = tcpmss_reverse_mtu(skb, family);
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struct net *net = dev_net(par->in ? par->in : par->out);
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unsigned int in_mtu = tcpmss_reverse_mtu(net, skb, family);
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if (dst_mtu(skb_dst(skb)) <= minlen) {
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net_err_ratelimited("unknown or invalid path-MTU (%u)\n",
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