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netfilter: connmark: ignore skbs with magic untracked conntrack objects
The (percpu) untracked conntrack entries can end up with nonzero connmarks. The 'untracked' conntrack objects are merely a way to distinguish INVALID (i.e. protocol connection tracker says payload doesn't meet some requirements or packet was never seen by the connection tracking code) from packets that are intentionally not tracked (some icmpv6 types such as neigh solicitation, or by using 'iptables -j CT --notrack' option). Untracked conntrack objects are implementation detail, we might as well use invalid magic address instead to tell INVALID and UNTRACKED apart. Check skb->nfct for untracked dummy and behave as if skb->nfct is NULL. Reported-by: XU Tianwen <evan.xu.tianwen@gmail.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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@ -44,7 +44,7 @@ connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
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u_int32_t newmark;
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ct = nf_ct_get(skb, &ctinfo);
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if (ct == NULL)
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if (ct == NULL || nf_ct_is_untracked(ct))
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return XT_CONTINUE;
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switch (info->mode) {
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@ -97,7 +97,7 @@ connmark_mt(const struct sk_buff *skb, struct xt_action_param *par)
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const struct nf_conn *ct;
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ct = nf_ct_get(skb, &ctinfo);
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if (ct == NULL)
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if (ct == NULL || nf_ct_is_untracked(ct))
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return false;
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return ((ct->mark & info->mask) == info->mark) ^ info->invert;
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