diff mbox series

[Openvpn-devel,v2] dco_linux: use M_FATAL instead of M_ERR in netlink error code paths

Message ID 20250723063039.25449-1-gert@greenie.muc.de
State New
Headers show
Series [Openvpn-devel,v2] dco_linux: use M_FATAL instead of M_ERR in netlink error code paths | expand

Commit Message

Gert Doering July 23, 2025, 6:30 a.m. UTC 
From: Antonio Quartulli <antonio@mandelbit.com>

Netlink code doesn't set errno upon error (with the exception of
any *alloc() function which probably inherits the errno=ENOMEM
from the underlying malloc call), therefore we should not print
error messages with M_ERR, but rather rely on M_FATAL.

M_ERR is equivalent to M_FATAL with the addition of appending
": $errno" to the error string.

Since errno is not meaningful in this context, we can just opt
for the less confusing M_FATAL.

Change-Id: Ifc442b4426c02de7282d0f69629e8a10b679c589
Signed-off-by: Antonio Quartulli <antonio@mandelbit.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
---

This change was reviewed on Gerrit and approved by at least one
developer. I request to merge it to master.

Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1096
This mail reflects revision 2 of this Change.

Acked-by according to Gerrit (reflected above):
Gert Doering <gert@greenie.muc.de>

Comments

Gert Doering July 23, 2025, 8:18 a.m. UTC | #1 
Stared at the code, this is all "in netlink error handling", so the
changes makes sense.

Your patch has been applied to the master branch.

commit dfe71b0a397273efffabbc01d1f6a9933f607933
Author: Antonio Quartulli
Date:   Wed Jul 23 08:30:30 2025 +0200

     dco_linux: use M_FATAL instead of M_ERR in netlink error code paths

     Signed-off-by: Antonio Quartulli <antonio@mandelbit.com>
     Acked-by: Gert Doering <gert@greenie.muc.de>
     Message-Id: <20250723063039.25449-1-gert@greenie.muc.de>
     URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg32271.html
     Signed-off-by: Gert Doering <gert@greenie.muc.de>


--
kind regards,

Gert Doering
diff mbox series

Patch

diff --git a/src/openvpn/dco_linux.c b/src/openvpn/dco_linux.c
index 58051f5..13506a1 100644
--- a/src/openvpn/dco_linux.c
+++ b/src/openvpn/dco_linux.c
@@ -114,7 +114,7 @@ 
     struct nl_msg *nl_msg = nlmsg_alloc();
     if (!nl_msg)
     {
-        msg(M_ERR, "cannot allocate netlink message");
+        msg(M_FATAL, "cannot allocate netlink message");
         return NULL;
     }
 
@@ -140,7 +140,7 @@ 
             break;
 
         case -NLE_NOMEM:
-            msg(M_ERR, "%s: netlink out of memory error", prefix);
+            msg(M_FATAL, "%s: netlink out of memory error", prefix);
             break;
 
         case -NLE_AGAIN:
@@ -148,7 +148,7 @@ 
             break;
 
         case -NLE_NODEV:
-            msg(M_ERR, "%s: netlink reports device not found:", prefix);
+            msg(M_FATAL, "%s: netlink reports device not found:", prefix);
             break;
 
         case -NLE_OBJ_NOTFOUND:
@@ -387,19 +387,19 @@ 
 static void
 ovpn_dco_init_netlink(dco_context_t *dco)
 {
-    dco->ovpn_dco_id = resolve_ovpn_netlink_id(M_ERR);
+    dco->ovpn_dco_id = resolve_ovpn_netlink_id(M_FATAL);
 
     dco->nl_sock = nl_socket_alloc();
 
     if (!dco->nl_sock)
     {
-        msg(M_ERR, "Cannot create netlink socket");
+        msg(M_FATAL, "Cannot create netlink socket");
     }
 
     int ret = genl_connect(dco->nl_sock);
     if (ret)
     {
-        msg(M_ERR, "Cannot connect to generic netlink: %s",
+        msg(M_FATAL, "Cannot connect to generic netlink: %s",
             nl_geterror(ret));
     }
 
@@ -415,7 +415,7 @@ 
     dco->nl_cb = nl_cb_alloc(NL_CB_DEFAULT);
     if (!dco->nl_cb)
     {
-        msg(M_ERR, "failed to allocate netlink callback");
+        msg(M_FATAL, "failed to allocate netlink callback");
     }
 
     nl_socket_set_cb(dco->nl_sock, dco->nl_cb);
@@ -484,7 +484,7 @@ 
 
     if (dco->ovpn_dco_mcast_id < 0)
     {
-        msg(M_ERR, "cannot get mcast group: %s",  nl_geterror(dco->ovpn_dco_mcast_id));
+        msg(M_FATAL, "cannot get mcast group: %s",  nl_geterror(dco->ovpn_dco_mcast_id));
     }
 
     /* Register for ovpn-dco specific multicast messages that the kernel may
@@ -493,7 +493,7 @@ 
     int ret = nl_socket_add_membership(dco->nl_sock, dco->ovpn_dco_mcast_id);
     if (ret)
     {
-        msg(M_ERR, "%s: failed to join groups: %d", __func__, ret);
+        msg(M_FATAL, "%s: failed to join groups: %d", __func__, ret);
     }
 }