netdev - [PATCH net-next v2 2/3] netfilter: nfnetlink: Handle ACK flags for batch messages

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Message-ID: <20240410221108.37414-3-donald.hunter@gmail.com>
Date: Wed, 10 Apr 2024 23:11:07 +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 v2 2/3] netfilter: nfnetlink: Handle ACK flags for batch messages

The NLM_F_ACK flag is not processed for nfnetlink batch messages. This
is a problem for ynl which wants to receive an ack for every message it
sends. Add processing for ACK 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. I also
ran a search on github and did not spot any usage that would break.

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..37762941c288 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;
 
@@ -463,6 +466,8 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
 			goto done;
 		} else if (type == NFNL_MSG_BATCH_END) {
 			status |= NFNL_BATCH_DONE;
+			if (nlh->nlmsg_flags & NLM_F_ACK)
+				nfnl_err_add(&err_list, nlh, 0, &extack);
 			goto done;
 		} else if (type < NLMSG_MIN_TYPE) {
 			err = -EINVAL;
-- 
2.43.0