The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 03a3ca37e4c6478e3a84f04c8429dd5889e107fd Mon Sep 17 00:00:00 2001
From: Florian Westphal fw@strlen.de Date: Wed, 24 Feb 2021 17:23:19 +0100 Subject: [PATCH] netfilter: nf_nat: undo erroneous tcp edemux lookup
Under extremely rare conditions TCP early demux will retrieve the wrong socket.
1. local machine establishes a connection to a remote server, S, on port p.
This gives: laddr:lport -> S:p ... both in tcp and conntrack.
2. local machine establishes a connection to host H, on port p2. 2a. TCP stack choses same laddr:lport, so we have laddr:lport -> H:p2 from TCP point of view. 2b). There is a destination NAT rewrite in place, translating H:p2 to S:p. This results in following conntrack entries:
I) laddr:lport -> S:p (origin) S:p -> laddr:lport (reply) II) laddr:lport -> H:p2 (origin) S:p -> laddr:lport2 (reply)
NAT engine has rewritten laddr:lport to laddr:lport2 to map the reply packet to the correct origin.
When server sends SYN/ACK to laddr:lport2, the PREROUTING hook will undo-the SNAT transformation, rewriting IP header to S:p -> laddr:lport
This causes TCP early demux to associate the skb with the TCP socket of the first connection.
The INPUT hook will then reverse the DNAT transformation, rewriting the IP header to H:p2 -> laddr:lport.
Because packet ends up with the wrong socket, the new connection never completes: originator stays in SYN_SENT and conntrack entry remains in SYN_RECV until timeout, and responder retransmits SYN/ACK until it gives up.
To resolve this, orphan the skb after the input rewrite: Because the source IP address changed, the socket must be incorrect. We can't move the DNAT undo to prerouting due to backwards compatibility, doing so will make iptables/nftables rules to no longer match the way they did.
After orphan, the packet will be handed to the next protocol layer (tcp, udp, ...) and that will repeat the socket lookup just like as if early demux was disabled.
Fixes: 41063e9dd1195 ("ipv4: Early TCP socket demux.") Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1427 Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org
diff --git a/net/netfilter/nf_nat_proto.c b/net/netfilter/nf_nat_proto.c index e87b6bd6b3cd..4731d21fc3ad 100644 --- a/net/netfilter/nf_nat_proto.c +++ b/net/netfilter/nf_nat_proto.c @@ -646,8 +646,8 @@ nf_nat_ipv4_fn(void *priv, struct sk_buff *skb, }
static unsigned int -nf_nat_ipv4_in(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state) +nf_nat_ipv4_pre_routing(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) { unsigned int ret; __be32 daddr = ip_hdr(skb)->daddr; @@ -659,6 +659,23 @@ nf_nat_ipv4_in(void *priv, struct sk_buff *skb, return ret; }
+static unsigned int +nf_nat_ipv4_local_in(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + __be32 saddr = ip_hdr(skb)->saddr; + struct sock *sk = skb->sk; + unsigned int ret; + + ret = nf_nat_ipv4_fn(priv, skb, state); + + if (ret == NF_ACCEPT && sk && saddr != ip_hdr(skb)->saddr && + !inet_sk_transparent(sk)) + skb_orphan(skb); /* TCP edemux obtained wrong socket */ + + return ret; +} + static unsigned int nf_nat_ipv4_out(void *priv, struct sk_buff *skb, const struct nf_hook_state *state) @@ -736,7 +753,7 @@ nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb, static const struct nf_hook_ops nf_nat_ipv4_ops[] = { /* Before packet filtering, change destination */ { - .hook = nf_nat_ipv4_in, + .hook = nf_nat_ipv4_pre_routing, .pf = NFPROTO_IPV4, .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP_PRI_NAT_DST, @@ -757,7 +774,7 @@ static const struct nf_hook_ops nf_nat_ipv4_ops[] = { }, /* After packet filtering, change source */ { - .hook = nf_nat_ipv4_fn, + .hook = nf_nat_ipv4_local_in, .pf = NFPROTO_IPV4, .hooknum = NF_INET_LOCAL_IN, .priority = NF_IP_PRI_NAT_SRC,