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netfilter: nfnetlink_hook: use the sequence number of the request message

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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: e2cf17d377 ("netfilter: add new hook nfnl subsystem")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2021-08-04 01:27:19 +02:00
parent a6e57c4af1
commit 3d9bbaf6c5
1 changed files with 2 additions and 1 deletions
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3
net/netfilter/nfnetlink_hook.c
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@ -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;
}