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netfilter: flowtable: nft_flow_route use more data for reverse route

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When creating a flow table entry, the reverse route is looked
up based on the current packet.
There can be scenarios where the user creates a custom ip rule
to route the traffic differently.
In order to support those scenarios, the lookup needs to add
more information based on the current packet.
The patch adds multiple new information to the route lookup.

Signed-off-by: Sven Auhagen <sven.auhagen@voleatech.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Sven Auhagen 2022-04-27 09:15:15 +02:00 committed by Pablo Neira Ayuso
parent 8edc813111
commit 3412e16418
1 changed files with 8 additions and 0 deletions
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8
net/netfilter/nft_flow_offload.c
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@ -227,11 +227,19 @@ static int nft_flow_route(const struct nft_pktinfo *pkt,
switch (nft_pf(pkt)) {
case NFPROTO_IPV4:
fl.u.ip4.daddr = ct->tuplehash[dir].tuple.src.u3.ip;
fl.u.ip4.saddr = ct->tuplehash[dir].tuple.dst.u3.ip;
fl.u.ip4.flowi4_oif = nft_in(pkt)->ifindex;
fl.u.ip4.flowi4_iif = this_dst->dev->ifindex;
fl.u.ip4.flowi4_tos = RT_TOS(ip_hdr(pkt->skb)->tos);
fl.u.ip4.flowi4_mark = pkt->skb->mark;
break;
case NFPROTO_IPV6:
fl.u.ip6.daddr = ct->tuplehash[dir].tuple.src.u3.in6;
fl.u.ip6.saddr = ct->tuplehash[dir].tuple.dst.u3.in6;
fl.u.ip6.flowi6_oif = nft_in(pkt)->ifindex;
fl.u.ip6.flowi6_iif = this_dst->dev->ifindex;
fl.u.ip6.flowlabel = ip6_flowinfo(ipv6_hdr(pkt->skb));
fl.u.ip6.flowi6_mark = pkt->skb->mark;
break;
}