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netfilter: nft_flow_offload: Fix reverse route lookup

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Using the following example:

	client 1.1.1.7 ---> 2.2.2.7 which dnat to 10.0.0.7 server

The first reply packet (ie. syn+ack) uses an incorrect destination
address for the reverse route lookup since it uses:

	daddr = ct->tuplehash[!dir].tuple.dst.u3.ip;

which is 2.2.2.7 in the scenario that is described above, while this
should be:

	daddr = ct->tuplehash[dir].tuple.src.u3.ip;

that is 10.0.0.7.

Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
wenxu 2019-01-09 10:40:11 +08:00 committed by Pablo Neira Ayuso
parent 715849ab31
commit a799aea098
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/nft_flow_offload.c
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@ -29,10 +29,10 @@ static int nft_flow_route(const struct nft_pktinfo *pkt,
memset(&fl, 0, sizeof(fl));
switch (nft_pf(pkt)) {
case NFPROTO_IPV4:
fl.u.ip4.daddr = ct->tuplehash[!dir].tuple.dst.u3.ip;
fl.u.ip4.daddr = ct->tuplehash[dir].tuple.src.u3.ip;
break;
case NFPROTO_IPV6:
fl.u.ip6.daddr = ct->tuplehash[!dir].tuple.dst.u3.in6;
fl.u.ip6.daddr = ct->tuplehash[dir].tuple.src.u3.in6;
break;
}