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netlink: enumerate existing interfaces at startup #468

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Merged
troglobit merged 1 commit into from
Jan 18, 2026
Merged

netlink: enumerate existing interfaces at startup #468

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22 changes: 21 additions & 1 deletion plugins/netlink.c
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Original file line number Diff line number Diff line change
Expand Up @@ -406,9 +406,29 @@ static void nl_reconf(void *arg)
cond_reassert("net/");
}

/*
* Initial enumeration of existing interfaces and routes. Called from
* HOOK_SVC_PLUGIN which runs after the condition system is initialized.
* Interfaces that exist before finit starts (e.g., virtio-net in QEMU)
* won't generate RTM_NEWLINK events, so we must query for them.
*/
static void nl_enumerate(void *arg)
{
int sd;

sd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (sd < 0)
return;

nl_resync_ifaces(sd, 0);
nl_resync_routes(sd, 1);
close(sd);
}

static plugin_t plugin = {
.name = __FILE__,
.hook[HOOK_SVC_RECONF] = { .cb = nl_reconf },
.hook[HOOK_SVC_RECONF] = { .cb = nl_reconf },
.hook[HOOK_SVC_PLUGIN] = { .cb = nl_enumerate },
.io = {
.cb = nl_callback,
.flags = PLUGIN_IO_READ,
Expand Down