From: Michael Tremer <michael.tremer@ipfire.org>
Date: Mon, 13 Feb 2023 15:14:01 +0000 (+0000)
Subject: networkd: Add function to check whether a link has a carrier
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=dfd49c2cc85fcee2303a96bc2186de0e21d8da4f;p=network.git

networkd: Add function to check whether a link has a carrier

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/networkd/link.c b/src/networkd/link.c
index 6392a90a..80478f43 100644
--- a/src/networkd/link.c
+++ b/src/networkd/link.c
@@ -18,7 +18,7 @@
 #                                                                             #
 #############################################################################*/
 
-#include <net/if.h>
+#include <linux/if.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
@@ -39,7 +39,7 @@ struct nw_link {
 	int ifindex;
 
 	// Interface Name
-	char ifname[IF_NAMESIZE];
+	char ifname[IFNAMSIZ];
 
 	// MTU
 	uint32_t mtu;
@@ -98,6 +98,20 @@ int nw_link_ifindex(nw_link* link) {
 	return link->ifindex;
 }
 
+// Carrier
+
+int nw_link_has_carrier(nw_link* link) {
+	return link->operstate == IF_OPER_UP;
+}
+
+static int nw_link_carrier_gained(nw_link* link) {
+	return 0; // XXX TODO
+}
+
+static int nw_link_carrier_lost(nw_link* link) {
+	return 0; // XXX TODO
+}
+
 static int nw_link_update_ifname(nw_link* link, sd_netlink_message* message) {
 	const char* ifname = NULL;
 	int r;
@@ -197,10 +211,24 @@ static int nw_link_update_flags(nw_link* link, sd_netlink_message* message) {
 
 	// XXX We should log any changes here
 
+	// Fetch current carrier state
+	const int had_carrier = nw_link_has_carrier(link);
+
 	// Store the new flags & operstate
 	link->flags = flags;
 	link->operstate = operstate;
 
+	// Notify if carrier was gained or lost
+	if (!had_carrier && nw_link_has_carrier(link)) {
+		r = nw_link_carrier_gained(link);
+		if (r < 0)
+			return r;
+
+	} else if (had_carrier && !nw_link_has_carrier(link)) {
+		r = nw_link_carrier_lost(link);
+		if (r < 0)
+			return r;
+	}
 
 	return 0;
 }
diff --git a/src/networkd/link.h b/src/networkd/link.h
index acb5e7b3..3d8d3974 100644
--- a/src/networkd/link.h
+++ b/src/networkd/link.h
@@ -33,6 +33,8 @@ nw_link* nw_link_unref(nw_link* link);
 int nw_link_ifindex(nw_link* link);
 const char* nw_link_name(nw_link* link);
 
+int nw_link_has_carrier(nw_link* link);
+
 int nw_link_process(sd_netlink* rtnl, sd_netlink_message* message, void* data);
 
 #endif /* NETWORKD_LINK_H */