config: use dedicated link local function to check interface

Use netlink_get_interface_addrs is wrong and doesn't actually work. The
function checks only for UNIVERSE address and is not suitable for
dumping linklocal address of an interface. Use the new and dedicated
function to get interface linklocal address to correctly check if the
interface can receive message.

Fixes: #197
Fixes: 7c0f603abc14 ("router: skip RA and wait for LINK-LOCAL to be assigned")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

1 files changed, 15 insertions, 10 deletions

diff --git a/src/config.c b/src/config.c
index 6122fb1..30fdc30 100644
--- a/src/config.c
+++ b/src/config.c
@@ -518,8 +518,10 @@ static int parse_ntp_fqdn(uint16_t *dhcpv6_ntp_len, char *fqdn, uint8_t **dhcpv6
 
 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 {
+	struct odhcpd_ipaddr *addrs = NULL;
 	struct interface *iface;
 	struct blob_attr *tb[IFACE_ATTR_MAX], *c;
+	ssize_t addrs_len;
 	bool get_addrs = false;
 	int mode;
 	const char *ifname = NULL;
@@ -588,25 +590,28 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr
 	}
 
 	if (get_addrs) {
-		ssize_t len = netlink_get_interface_addrs(iface->ifindex,
+		addrs_len = netlink_get_interface_addrs(iface->ifindex,
 						true, &iface->addr6);
 
-		if (len > 0)
-			iface->addr6_len = len;
+		if (addrs_len > 0)
+			iface->addr6_len = addrs_len;
 
-		for (size_t i = 0; i < iface->addr6_len; i++) {
-			struct odhcpd_ipaddr *addr = &iface->addr6[i];
+		addrs_len = netlink_get_interface_addrs(iface->ifindex,
+						false, &iface->addr4);
+		if (addrs_len > 0)
+			iface->addr4_len = addrs_len;
+	}
+
+	addrs_len = netlink_get_interface_linklocal(iface->ifindex, &addrs);
+	if (addrs_len > 0) {
+		for (ssize_t i = 0; i < addrs_len; i++) {
+			struct odhcpd_ipaddr *addr = &addrs[i];
 
 			if (!addr->tentative) {
 				iface->have_link_local = true;
 				break;
 			}
 		}
-
-		len = netlink_get_interface_addrs(iface->ifindex,
-						false, &iface->addr4);
-		if (len > 0)
-			iface->addr4_len = len;
 	}
 
 	iface->inuse = true;