netdev - [PATCH net-next v2 03/15] mptcp: pm: more precise error messages

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Message-Id: <20250117-net-next-mptcp-pm-misc-cleanup-2-v2-3-61d4fe0586e8@kernel.org>
Date: Fri, 17 Jan 2025 19:41:35 +0100
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>, 
 Geliang Tang <geliang@...nel.org>, "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>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Subject: [PATCH net-next v2 03/15] mptcp: pm: more precise error messages

Some errors reported by the userspace PM were vague: "this or that is
invalid".

It is easier for the userspace to know which part is wrong, instead of
having to guess that.

While at it, in mptcp_userspace_pm_set_flags() move the parsing after
the check linked to the local attribute.

Reviewed-by: Geliang Tang <geliang@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
 net/mptcp/pm_userspace.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index b6cf8ea1161ddc7f0f1662320aebfe720f55e722..cdc83fabb7c2c45bc3d7c954a824c8f27bb85718 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -223,8 +223,14 @@ int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info)
 		goto announce_err;
 	}

-	if (addr_val.addr.id == 0 || !(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
-		GENL_SET_ERR_MSG(info, "invalid addr id or flags");
+	if (addr_val.addr.id == 0) {
+		GENL_SET_ERR_MSG(info, "invalid addr id");
+		err = -EINVAL;
+		goto announce_err;
+	}
+
+	if (!(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
+		GENL_SET_ERR_MSG(info, "invalid addr flags");
 		err = -EINVAL;
 		goto announce_err;
 	}
@@ -531,8 +537,14 @@ int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info
 		goto destroy_err;
 	}

-	if (!addr_l.addr.port || !addr_r.port) {
-		GENL_SET_ERR_MSG(info, "missing local or remote port");
+	if (!addr_l.addr.port) {
+		GENL_SET_ERR_MSG(info, "missing local port");
+		err = -EINVAL;
+		goto destroy_err;
+	}
+
+	if (!addr_r.port) {
+		GENL_SET_ERR_MSG(info, "missing remote port");
 		err = -EINVAL;
 		goto destroy_err;
 	}
@@ -580,13 +592,18 @@ int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info)
 	if (ret < 0)
 		goto set_flags_err;

+	if (loc.addr.family == AF_UNSPEC) {
+		GENL_SET_ERR_MSG(info, "invalid local address family");
+		ret = -EINVAL;
+		goto set_flags_err;
+	}
+
 	ret = mptcp_pm_parse_entry(attr_rem, info, false, &rem);
 	if (ret < 0)
 		goto set_flags_err;

-	if (loc.addr.family == AF_UNSPEC ||
-	    rem.addr.family == AF_UNSPEC) {
-		GENL_SET_ERR_MSG(info, "invalid address families");
+	if (rem.addr.family == AF_UNSPEC) {
+		GENL_SET_ERR_MSG(info, "invalid remote address family");
 		ret = -EINVAL;
 		goto set_flags_err;
 	}

-- 
2.47.1