Thread (10 messages) 10 messages, 1 author, 2021-03-19
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[PATCH net 4/9] netfilter: ctnetlink: fix dump of the expect mask attribute

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2021-03-19 01:07:08
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>

Before this change, the mask is never included in the netlink message, so
"conntrack -E expect" always prints 0.0.0.0.

In older kernels the l3num callback struct was passed as argument, based
on tuple->src.l3num. After the l3num indirection got removed, the call
chain is based on m.src.l3num, but this value is 0xffff.

Init l3num to the correct value.

Fixes: f957be9d349a3 ("netfilter: conntrack: remove ctnetlink callbacks from l3 protocol trackers")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conntrack_netlink.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 1469365bac7e..1d519b0e51a5 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -2962,6 +2962,7 @@ static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
 	memset(&m, 0xFF, sizeof(m));
 	memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
 	m.src.u.all = mask->src.u.all;
+	m.src.l3num = tuple->src.l3num;
 	m.dst.protonum = tuple->dst.protonum;
 
 	nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
-- 
2.20.1
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