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From: Matthew Wood <thepacketgeek@gmail.com>
To: "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>
Cc: Breno Leitao <leitao@debian.org>,
	netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH net-next v3 7/8] net: netconsole: append userdata to netconsole messages
Date: Sun,  4 Feb 2024 15:27:38 -0800
Message-ID: <20240204232744.91315-8-thepacketgeek@gmail.com>
In-Reply-To: <20240204232744.91315-1-thepacketgeek@gmail.com>
References: <20240204232744.91315-1-thepacketgeek@gmail.com>
Precedence: bulk
MIME-Version: 1.0
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Append userdata to outgoing unfragmented (<1000 bytes) netconsole messages.
When sending messages the userdata string is already formatted and stored
in netconsole_target->userdata_complete.

Always write the outgoing message to buf, so userdata can be appended in
a standard fashion. This is a change from only using buf when the
release needs to be prepended to the message.

Co-developed-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Matthew Wood <thepacketgeek@gmail.com>
---
 drivers/net/netconsole.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index e4d6ba0b50ef..d53bb1172336 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -1034,19 +1034,34 @@ static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
 	const char *msg_ready = msg;
 	const char *release;
 	int release_len = 0;
+	int userdata_len = 0;
+	char *userdata = NULL;
+
+#ifdef CONFIG_NETCONSOLE_DYNAMIC
+	userdata = nt->userdata_complete;
+	userdata_len = nt->userdata_length;
+#endif
 
 	if (nt->release) {
 		release = init_utsname()->release;
 		release_len = strlen(release) + 1;
 	}
 
-	if (msg_len + release_len <= MAX_PRINT_CHUNK) {
+	if (msg_len + release_len + userdata_len <= MAX_PRINT_CHUNK) {
 		/* No fragmentation needed */
 		if (nt->release) {
 			scnprintf(buf, MAX_PRINT_CHUNK, "%s,%s", release, msg);
 			msg_len += release_len;
-			msg_ready = buf;
+		} else {
+			memcpy(buf, msg, msg_len);
 		}
+
+		if (userdata)
+			msg_len += scnprintf(&buf[msg_len],
+					     MAX_PRINT_CHUNK - msg_len,
+					     "%s", userdata);
+
+		msg_ready = buf;
 		netpoll_send_udp(&nt->np, msg_ready, msg_len);
 		return;
 	}
-- 
2.43.0