Thread (13 messages) 13 messages, 2 authors, 2021-08-06
STALE1798d
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[PATCH net 6/9] netfilter: nfnetlink_hook: use the sequence number of the request message

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2021-08-06 11:52:28
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 

The sequence number allows to correlate the netlink reply message (as
part of the dump) with the original request message.

The cb->seq field is internally used to detect an interference (update)
of the hook list during the netlink dump, do not use it as sequence
number in the netlink dump header.

Fixes: e2cf17d3774c ("netfilter: add new hook nfnl subsystem")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nfnetlink_hook.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nfnetlink_hook.c b/net/netfilter/nfnetlink_hook.c
index e0ff2973fd14..7b0d4a317457 100644
--- a/net/netfilter/nfnetlink_hook.c
+++ b/net/netfilter/nfnetlink_hook.c
@@ -264,7 +264,8 @@ static int nfnl_hook_dump(struct sk_buff *nlskb,
 	ops = nf_hook_entries_get_hook_ops(e);
 
 	for (; i < e->num_hook_entries; i++) {
-		err = nfnl_hook_dump_one(nlskb, ctx, ops[i], cb->seq);
+		err = nfnl_hook_dump_one(nlskb, ctx, ops[i],
+					 cb->nlh->nlmsg_seq);
 		if (err)
 			break;
 	}
-- 
2.20.1
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