Thread (5 messages) read the whole thread 5 messages, 2 authors, 2024-06-12
STALE781d

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[PATCH net 3/3] netfilter: Use flowlabel flow key when re-routing mangled packets

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2024-06-11 22:03:30
Also in: netfilter-devel
Subsystem: netfilter, networking [general], the rest · Maintainers: Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds 

From: Florian Westphal <fw@strlen.de>

'ip6 dscp set $v' in an nftables outpute route chain has no effect.
While nftables does detect the dscp change and calls the reroute hook.
But ip6_route_me_harder never sets the dscp/flowlabel:
flowlabel/dsfield routing rules are ignored and no reroute takes place.

Thanks to Yi Chen for an excellent reproducer script that I used
to validate this change.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Yi Chen <redacted>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/ipv6/netfilter.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index 53d255838e6a..5d989d803009 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -36,6 +36,7 @@ int ip6_route_me_harder(struct net *net, struct sock *sk_partial, struct sk_buff
 		.flowi6_uid = sock_net_uid(net, sk),
 		.daddr = iph->daddr,
 		.saddr = iph->saddr,
+		.flowlabel = ip6_flowinfo(iph),
 	};
 	int err;
 
-- 
2.30.2
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