linux-kernel - [PATCH net-next 4/5] netconsole: use netpoll_parse_ip_addr in local_ip

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Message-Id: <20250718-netconsole_ref-v1-4-86ef253b7a7a@debian.org>
Date: Fri, 18 Jul 2025 04:52:04 -0700
From: Breno Leitao <leitao@...ian.org>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Breno Leitao <leitao@...ian.org>, Andrew Lunn <andrew+netdev@...n.ch>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 kernel-team@...a.com
Subject: [PATCH net-next 4/5] netconsole: use netpoll_parse_ip_addr in
 local_ip_store

Replace manual IP address parsing with a call to netpoll_parse_ip_addr
in local_ip_store(), simplifying the code and reducing the chance of
errors.

Also, remove the pr_err() if the user enters an invalid value in
configfs entries. pr_err() is not the best way to alert user that the
configuration is invalid.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 drivers/net/netconsole.c | 22 +++++-----------------
 1 file changed, 5 insertions(+), 17 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 7ea265752e021..3044349c5fe37 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -751,6 +751,7 @@ static ssize_t local_ip_store(struct config_item *item, const char *buf,
 {
 	struct netconsole_target *nt = to_target(item);
 	ssize_t ret = -EINVAL;
+	int ipv6;

 	mutex_lock(&dynamic_netconsole_mutex);
 	if (nt->enabled) {
@@ -759,23 +760,10 @@ static ssize_t local_ip_store(struct config_item *item, const char *buf,
 		goto out_unlock;
 	}

-	if (strnchr(buf, count, ':')) {
-		const char *end;
-
-		if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) {
-			if (*end && *end != '\n') {
-				pr_err("invalid IPv6 address at: <%c>\n", *end);
-				goto out_unlock;
-			}
-			nt->np.ipv6 = true;
-		} else
-			goto out_unlock;
-	} else {
-		if (!nt->np.ipv6)
-			nt->np.local_ip.ip = in_aton(buf);
-		else
-			goto out_unlock;
-	}
+	ipv6 = netpoll_parse_ip_addr(buf, &nt->np.local_ip);
+	if (ipv6 == -1)
+		goto out_unlock;
+	nt->np.ipv6 = ipv6;

 	ret = strnlen(buf, count);
 out_unlock:

-- 
2.47.1