From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 20 Oct 2025 17:43:27 +0000 (+0200)
Subject: system-linux: handle RTM_DELLINK events for device state tracking
X-Git-Url: http://git.openwrt.org/%22http:/oss.oetiker.ch/rrdtool//%22/%22http:/oss.oetiker.ch/rrdtool/%22?a=commitdiff_plain;h=b6d371f307705b32e1ef5c63d7bf6440c8859789;p=project%2Fnetifd.git

system-linux: handle RTM_DELLINK events for device state tracking

Add RTM_DELLINK handling to properly track device lifecycle. When a
device is deleted, update its state with flags=0 to mark it as not
present. This improves synchronization compared to only relying on
the hotplug handler.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

diff --git a/system-linux.c b/system-linux.c
index 6582535..ceeabe3 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -732,8 +732,9 @@ static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 	struct ifinfomsg *ifi = NLMSG_DATA(nh);
 	struct nlattr *nla[__IFLA_MAX];
 	struct device *dev;
+	unsigned int flags;
 
-	if (nh->nlmsg_type != RTM_NEWLINK)
+	if (nh->nlmsg_type != RTM_NEWLINK && nh->nlmsg_type != RTM_DELLINK)
 		return 0;
 
 	nlmsg_parse(nh, sizeof(struct ifinfomsg), nla, __IFLA_MAX - 1, NULL);
@@ -744,7 +745,8 @@ static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 	if (!dev)
 		return 0;
 
-	system_device_update_state(dev, ifi->ifi_flags);
+	flags = (nh->nlmsg_type == RTM_DELLINK) ? 0 : ifi->ifi_flags;
+	system_device_update_state(dev, flags);
 	return 0;
 }