netlink.c: recognize new interfaces coming up

Compared to the 1.x release the 2.x release lost the ability to
immediately setup new interfaces coming up. This patch adds code
to make it work again.

interface.c

@@ -17,6 +17,8 @@
 #include "radvd.h"
 #include "defaults.h"
 
+#define IFACE_SETUP_DELAY	1
+
 void iface_init_defaults(struct Interface *iface)
 {
 	memset(iface, 0, sizeof(struct Interface));
@@ -280,6 +282,21 @@ struct Interface *find_iface_by_index(struct Interface *iface, int index)
 	return 0;
 }
 
+struct Interface *find_iface_by_name(struct Interface *iface, const char *name)
+{
+	if (!name) {
+		return 0;
+	}
+
+	for (; iface; iface = iface->next) {
+		if (strcmp(iface->props.name, name) == 0) {
+			return iface;
+		}
+	}
+
+	return 0;
+}
+
 struct Interface *find_iface_by_time(struct Interface *iface)
 {
 	if (!iface) {
@@ -305,8 +322,9 @@ void reschedule_iface(struct Interface *iface, double next)
 #ifdef HAVE_NETLINK
 	if (!iface->state_info.changed && !iface->state_info.ready) {
 		next = 10 * iface->MaxRtrAdvInterval;
-	}
-	else
+	} else if (next == 0) {
+		next = IFACE_SETUP_DELAY;
+	} else
 #endif
 	if (iface->state_info.racount < MAX_INITIAL_RTR_ADVERTISEMENTS) {
 		next = min(MAX_INITIAL_RTR_ADVERT_INTERVAL, iface->MaxRtrAdvInterval);

netlink.c

@@ -76,8 +76,16 @@ void process_netlink_msg(int sock, struct Interface * ifaces)
 				}
 			}
 
-			/* Reinit the interfaces which needs it. */
-			struct Interface *iface = find_iface_by_index(ifaces, ifinfo->ifi_index);
+			/* Reinit the interfaces which need it. */
+			struct Interface *iface;
+			switch (nh->nlmsg_type) {
+			case RTM_NEWLINK:
+				iface = find_iface_by_name(ifaces, ifname);
+				break;
+			default:
+				iface = find_iface_by_index(ifaces, ifinfo->ifi_index);
+				break;
+			}
 			if (iface) {
 				touch_iface(iface);
 			}

radvd.h

@@ -279,6 +279,7 @@ int update_device_info(int sock, struct Interface *);
 int check_iface(struct Interface *);
 int setup_iface(int sock, struct Interface *iface);
 struct Interface *find_iface_by_index(struct Interface *iface, int index);
+struct Interface *find_iface_by_name(struct Interface *iface, const char *name);
 struct Interface *find_iface_by_time(struct Interface *iface_list);
 void dnssl_init_defaults(struct AdvDNSSL *, struct Interface *);
 void for_each_iface(struct Interface *ifaces, void (*foo) (struct Interface * iface, void *), void *data);