netdev - [PATCH net-next v4 4/4] netfilter: nfnetlink: Handle ACK flags for batch messages

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Message-ID: <20240418104737.77914-5-donald.hunter@gmail.com>
Date: Thu, 18 Apr 2024 11:47:37 +0100
From: Donald Hunter <donald.hunter@...il.com>
To: netdev@...r.kernel.org,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...filter.org>,
	netfilter-devel@...r.kernel.org,
	coreteam@...filter.org
Cc: donald.hunter@...hat.com,
	Donald Hunter <donald.hunter@...il.com>
Subject: [PATCH net-next v4 4/4] netfilter: nfnetlink: Handle ACK flags for batch messages

The NLM_F_ACK flag is ignored for nfnetlink batch begin and end
messages. This is a problem for ynl which wants to receive an ack for
every message it sends, not just the commands in between the begin/end
messages.

Add processing for ACKs for begin/end messages and provide responses
when requested.

I have checked that iproute2, pyroute2 and systemd are unaffected by
this change since none of them use NLM_F_ACK for batch begin/end.

Signed-off-by: Donald Hunter <donald.hunter@...il.com>
---
 net/netfilter/nfnetlink.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index c9fbe0f707b5..4abf660c7baf 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -427,6 +427,9 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 	nfnl_unlock(subsys_id);
 
+	if (nlh->nlmsg_flags & NLM_F_ACK)
+		nfnl_err_add(&err_list, nlh, 0, &extack);
+
 	while (skb->len >= nlmsg_total_size(0)) {
 		int msglen, type;
 
@@ -573,6 +576,8 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 		} else if (err) {
 			ss->abort(net, oskb, NFNL_ABORT_NONE);
 			netlink_ack(oskb, nlmsg_hdr(oskb), err, NULL);
+		} else if (nlh->nlmsg_flags & NLM_F_ACK) {
+			nfnl_err_add(&err_list, nlh, 0, &extack);
 		}
 	} else {
 		enum nfnl_abort_action abort_action;
-- 
2.44.0