netconfig: Subscribe for IPv6 address changes

index 70481abf..1c8b88dc 100644
@@ -224,6 +224,23 @@ static char **netconfig_ipv4_get_dns(struct netconfig *netconfig, uint8_t proto)
 	return NULL;
 }
 
+static bool netconfig_ifaddr_match(const void *a, const void *b)
+{
+	const struct netconfig_ifaddr *entry = a;
+	const struct netconfig_ifaddr *query = b;
+
+	if (entry->family != query->family)
+		return false;
+
+	if (entry->prefix_len != query->prefix_len)
+		return false;
+
+	if (strcmp(entry->ip, query->ip))
+		return false;
+
+	return true;
+}
+
 static struct netconfig_ifaddr *netconfig_ifaddr_find(
 					const struct netconfig *netconfig,
 					uint8_t family, uint8_t prefix_len,

@@ -335,6 +352,73 @@ static void netconfig_ifaddr_cmd_cb(int error, uint16_t type,
 	netconfig_ifaddr_notify(type, data, len, user_data);
 }
 
+static void netconfig_ifaddr_ipv6_added(struct netconfig *netconfig,
+					const struct ifaddrmsg *ifa,
+					uint32_t len)
+{
+	struct netconfig_ifaddr *ifaddr;
+
+	ifaddr = l_new(struct netconfig_ifaddr, 1);
+	ifaddr->family = ifa->ifa_family;
+	ifaddr->prefix_len = ifa->ifa_prefixlen;
+
+	rtnl_ifaddr_ipv6_extract(ifa, len, &ifaddr->ip);
+
+	l_debug("ifindex %u: ifaddr %s/%u", netconfig->ifindex, ifaddr->ip,
+							ifaddr->prefix_len);
+
+	l_queue_push_tail(netconfig->ifaddr_list, ifaddr);
+}
+
+static void netconfig_ifaddr_ipv6_deleted(struct netconfig *netconfig,
+						const struct ifaddrmsg *ifa,
+						uint32_t len)
+{
+	struct netconfig_ifaddr *ifaddr;
+	struct netconfig_ifaddr query;
+
+	rtnl_ifaddr_ipv6_extract(ifa, len, &query.ip);
+
+	query.family = ifa->ifa_family;
+	query.prefix_len = ifa->ifa_prefixlen;
+
+	ifaddr = l_queue_remove_if(netconfig->ifaddr_list,
+						netconfig_ifaddr_match, &query);
+
+	l_free(query.ip);
+
+	if (!ifaddr)
+		return;
+
+	l_debug("ifaddr %s/%u", ifaddr->ip, ifaddr->prefix_len);
+
+	netconfig_ifaddr_destroy(ifaddr);
+}
+
+static void netconfig_ifaddr_ipv6_notify(uint16_t type, const void *data,
+						uint32_t len, void *user_data)
+{
+	const struct ifaddrmsg *ifa = data;
+	struct netconfig *netconfig;
+	uint32_t bytes;
+
+	netconfig = netconfig_find(ifa->ifa_index);
+	if (!netconfig)
+		/* Ignore the interfaces which aren't managed by iwd. */
+		return;
+
+	bytes = len - NLMSG_ALIGN(sizeof(struct ifaddrmsg));
+
+	switch (type) {
+	case RTM_NEWADDR:
+		netconfig_ifaddr_ipv6_added(netconfig, ifa, bytes);
+		break;
+	case RTM_DELADDR:
+		netconfig_ifaddr_ipv6_deleted(netconfig, ifa, bytes);
+		break;
+	}
+}
+
 static void netconfig_route_cmd_cb(int error, uint16_t type,
 						const void *data, uint32_t len,
 						void *user_data)

@@ -740,6 +824,14 @@ static int netconfig_init(void)
 		goto error;
 	}
 
+	r = l_netlink_register(rtnl, RTNLGRP_IPV6_IFADDR,
+				netconfig_ifaddr_ipv6_notify, NULL, NULL);
+	if (!r) {
+		l_error("netconfig: Failed to register for RTNL link IPv6 "
+					"address notifications.");
+		goto error;
+	}
+
 	if (!l_settings_get_uint(iwd_get_config(), "General",
 							"route_priority_offset",
 							&ROUTE_PRIORITY_OFFSET))

index 1c8b88dc..7d1f5509 100644
@@ -419,6 +419,22 @@ static void netconfig_ifaddr_ipv6_notify(uint16_t type, const void *data,
 	}
 }
 
+static void netconfig_ifaddr_ipv6_cmd_cb(int error, uint16_t type,
+						const void *data, uint32_t len,
+						void *user_data)
+{
+	if (error) {
+		l_error("netconfig: ifaddr IPv6 command failure. "
+				"Error %d: %s", error, strerror(-error));
+		return;
+	}
+
+	if (type != RTM_NEWADDR)
+		return;
+
+	netconfig_ifaddr_ipv6_notify(type, data, len, user_data);
+}
+
 static void netconfig_route_cmd_cb(int error, uint16_t type,
 						const void *data, uint32_t len,
 						void *user_data)

@@ -832,6 +848,14 @@ static int netconfig_init(void)
 		goto error;
 	}
 
+	r = rtnl_ifaddr_ipv6_get(rtnl, netconfig_ifaddr_ipv6_cmd_cb, NULL,
+									NULL);
+	if (!r) {
+		l_error("netconfig: Failed to get IPv6 addresses from RTNL"
+								" link.");
+		goto error;
+	}
+
 	if (!l_settings_get_uint(iwd_get_config(), "General",
 							"route_priority_offset",
 							&ROUTE_PRIORITY_OFFSET))

index 7d1f5509..7d26acb0 100644
@@ -48,6 +48,7 @@ struct netconfig {
 	struct l_dhcp_client *dhcp_client;
 	struct l_queue *ifaddr_list;
 	uint8_t rtm_protocol;
+	uint8_t rtm_v6_protocol;
 
 	const struct l_settings *active_settings;
 };

@@ -224,6 +225,70 @@ static char **netconfig_ipv4_get_dns(struct netconfig *netconfig, uint8_t proto)
 	return NULL;
 }
 
+static struct netconfig_ifaddr *netconfig_ipv6_get_ifaddr(
+						struct netconfig *netconfig,
+						uint8_t proto)
+{
+	struct in6_addr in6_addr;
+	struct netconfig_ifaddr *ifaddr;
+	char *ip;
+	char *p;
+
+	switch (proto) {
+	case RTPROT_STATIC:
+		if (!netconfig->active_settings)
+			return NULL;
+
+		ip = l_settings_get_string(netconfig->active_settings, "IPv6",
+									"ip");
+		if (!ip)
+			return NULL;
+
+		ifaddr = l_new(struct netconfig_ifaddr, 1);
+		ifaddr->ip = ip;
+
+		p = strrchr(ifaddr->ip, '/');
+		if (!p)
+			goto no_prefix_len;
+
+		*p = '\0';
+
+		if (inet_pton(AF_INET6, ifaddr->ip, &in6_addr) < 1) {
+			l_error("netconfig: Invalid IPv6 address %s is "
+				"provided in network configuration file.",
+				ifaddr->ip);
+
+			netconfig_ifaddr_destroy(ifaddr);
+
+			return NULL;
+		}
+
+		if (*++p == '\0')
+			goto no_prefix_len;
+
+		ifaddr->prefix_len = strtoul(p, NULL, 10);
+
+		if (!unlikely(errno == EINVAL || errno == ERANGE ||
+				!ifaddr->prefix_len ||
+				ifaddr->prefix_len > 128))
+			goto proceed;
+
+no_prefix_len:
+		ifaddr->prefix_len = 128;
+proceed:
+		ifaddr->family = AF_INET6;
+
+		return ifaddr;
+
+	case RTPROT_DHCP:
+		/* TODO */
+
+		return NULL;
+	}
+
+	return NULL;
+}
+
 static bool netconfig_ifaddr_match(const void *a, const void *b)
 {
 	const struct netconfig_ifaddr *entry = a;

@@ -541,6 +606,19 @@ done:
 	netconfig_ifaddr_destroy(ifaddr);
 }
 
+static void netconfig_ipv6_ifaddr_add_cmd_cb(int error, uint16_t type,
+						const void *data, uint32_t len,
+						void *user_data)
+{
+	if (error && error != -EEXIST) {
+		l_error("netconfig: Failed to add IPv6 address. "
+				"Error %d: %s", error, strerror(-error));
+		return;
+	}
+
+	/* TODO Install routes and DNS */
+}
+
 static void netconfig_install_address(struct netconfig *netconfig,
 						struct netconfig_ifaddr *ifaddr)
 {

@@ -560,6 +638,16 @@ static void netconfig_install_address(struct netconfig *netconfig,
 		l_error("netconfig: Failed to set IP %s/%u.", ifaddr->ip,
 							ifaddr->prefix_len);
 		break;
+	case AF_INET6:
+		if (rtnl_ifaddr_ipv6_add(rtnl, netconfig->ifindex,
+					ifaddr->prefix_len, ifaddr->ip,
+					netconfig_ipv6_ifaddr_add_cmd_cb,
+					netconfig, NULL))
+			return;
+
+		l_error("netconfig: Failed to set IPv6 address %s/%u.",
+					ifaddr->ip, ifaddr->prefix_len);
+		break;
 	default:
 		l_error("netconfig: Unsupported address family: %u",
 								ifaddr->family);

@@ -606,6 +694,16 @@ static void netconfig_uninstall_address(struct netconfig *netconfig,
 		l_error("netconfig: Failed to delete IP %s/%u.",
 						ifaddr->ip, ifaddr->prefix_len);
 		break;
+	case AF_INET6:
+		if (rtnl_ifaddr_ipv6_delete(rtnl, netconfig->ifindex,
+					ifaddr->prefix_len, ifaddr->ip,
+					netconfig_ifaddr_del_cmd_cb, netconfig,
+					NULL))
+			return;
+
+		l_error("netconfig: Failed to delete IPv6 address %s/%u.",
+						ifaddr->ip, ifaddr->prefix_len);
+		break;
 	default:
 		l_error("netconfig: Unsupported address family: %u",
 								ifaddr->family);

@@ -717,6 +815,49 @@ static void netconfig_ipv4_select_and_uninstall(struct netconfig *netconfig)
 	l_dhcp_client_stop(netconfig->dhcp_client);
 }
 
+static void netconfig_ipv6_select_and_install(struct netconfig *netconfig)
+{
+	struct netconfig_ifaddr *ifaddr;
+
+	ifaddr = netconfig_ipv6_get_ifaddr(netconfig, RTPROT_STATIC);
+	if (ifaddr) {
+		netconfig->rtm_v6_protocol = RTPROT_STATIC;
+		netconfig_install_address(netconfig, ifaddr);
+		netconfig_ifaddr_destroy(ifaddr);
+
+		return;
+	}
+
+	/*
+	 *      TODO
+	 *
+	 *      netconfig->rtm_v6_protocol = RTPROT_DHCP;
+	 *
+	 *      if (l_dhcp_v6_client_start(netconfig->l_dhcp_v6_client))
+	 *            return;
+	 *
+	 *      l_error("netconfig: Failed to start DHCPv6 client for "
+	 *                  "interface %u", netconfig->ifindex);
+	 */
+}
+
+static void netconfig_ipv6_select_and_uninstall(struct netconfig *netconfig)
+{
+	struct netconfig_ifaddr *ifaddr;
+
+	ifaddr = netconfig_ipv6_get_ifaddr(netconfig,
+						netconfig->rtm_v6_protocol);
+	if (ifaddr) {
+		netconfig_uninstall_address(netconfig, ifaddr);
+		netconfig_ifaddr_destroy(ifaddr);
+	}
+
+	/*
+	 * TODO
+	 * l_dhcp_v6_client_stop(netconfig->l_dhcp_v6_client);
+	 */
+}
+
 bool netconfig_configure(struct netconfig *netconfig,
 				const struct l_settings *active_settings,
 				const uint8_t *mac_address)

@@ -728,7 +869,7 @@ bool netconfig_configure(struct netconfig *netconfig,
 
 	netconfig_ipv4_select_and_install(netconfig);
 
-	/* TODO: IPv6 addressing */
+	netconfig_ipv6_select_and_install(netconfig);
 
 	return true;
 }

@@ -739,7 +880,9 @@ bool netconfig_reconfigure(struct netconfig *netconfig)
 		/* TODO l_dhcp_client sending a DHCP inform request */
 	}
 
-	/* TODO: IPv6 addressing */
+	if (netconfig->rtm_v6_protocol == RTPROT_DHCP) {
+		/* TODO l_dhcp_v6_client sending a DHCP inform request */
+	}
 
 	return true;
 }

@@ -747,13 +890,13 @@ bool netconfig_reconfigure(struct netconfig *netconfig)
 bool netconfig_reset(struct netconfig *netconfig)
 {
 	netconfig_ipv4_select_and_uninstall(netconfig);
+	netconfig->rtm_protocol = 0;
 
-	/* TODO: IPv6 addressing */
+	netconfig_ipv6_select_and_uninstall(netconfig);
+	netconfig->rtm_v6_protocol = 0;
 
 	resolve_remove(netconfig->ifindex);
 
-	netconfig->rtm_protocol = 0;
-
 	return true;
 }
 

@@ -790,13 +933,14 @@ void netconfig_destroy(struct netconfig *netconfig)
 
 	l_queue_remove(netconfig_list, netconfig);
 
-	if (netconfig->rtm_protocol) {
+	if (netconfig->rtm_protocol)
 		netconfig_ipv4_select_and_uninstall(netconfig);
 
-		/* TODO Uninstall IPv6 addresses. */
+	if (netconfig->rtm_v6_protocol)
+		netconfig_ipv6_select_and_uninstall(netconfig);
 
+	if (netconfig->rtm_protocol || netconfig->rtm_v6_protocol)
 		resolve_remove(netconfig->ifindex);
-	}
 
 	netconfig_free(netconfig);
 }

index 7d26acb0..129fe518 100644
@@ -289,6 +289,40 @@ proceed:
 	return NULL;
 }
 
+static char *netconfig_ipv6_get_gateway(struct netconfig *netconfig)
+{
+	struct in6_addr in6_addr;
+	char *gateway;
+
+	switch (netconfig->rtm_v6_protocol) {
+	case RTPROT_STATIC:
+		if (!netconfig->active_settings)
+			return NULL;
+
+		gateway = l_settings_get_string(netconfig->active_settings,
+							"IPv6", "gateway");
+
+		if (inet_pton(AF_INET6, gateway, &in6_addr) < 1) {
+			l_error("netconfig: Invalid IPv6 gateway address %s is "
+				"provided in network configuration file.",
+				gateway);
+
+			l_free(gateway);
+
+			return NULL;
+		}
+
+		return gateway;
+
+	case RTPROT_DHCP:
+		/* TODO */
+
+		return NULL;
+	}
+
+	return NULL;
+}
+
 static bool netconfig_ifaddr_match(const void *a, const void *b)
 {
 	const struct netconfig_ifaddr *entry = a;

@@ -606,17 +640,52 @@ done:
 	netconfig_ifaddr_destroy(ifaddr);
 }
 
+static bool netconfig_ipv6_routes_install(struct netconfig *netconfig)
+{
+	L_AUTO_FREE_VAR(char *, gateway) = NULL;
+
+	gateway = netconfig_ipv6_get_gateway(netconfig);
+	if (!gateway) {
+		l_error("netconfig: Failed to obtain gateway from %s.",
+				netconfig->rtm_v6_protocol == RTPROT_STATIC ?
+				"settings file" : "DHCPv6 lease");
+
+		return false;
+	}
+
+	if (!rtnl_route_ipv6_add_gateway(rtnl, netconfig->ifindex, gateway,
+						ROUTE_PRIORITY_OFFSET,
+						netconfig->rtm_v6_protocol,
+						netconfig_route_cmd_cb,
+						NULL, NULL)) {
+		l_error("netconfig: Failed to add route for: %s gateway.",
+								gateway);
+
+		return false;
+	}
+
+	return true;
+}
+
 static void netconfig_ipv6_ifaddr_add_cmd_cb(int error, uint16_t type,
 						const void *data, uint32_t len,
 						void *user_data)
 {
+	struct netconfig *netconfig = user_data;
+
 	if (error && error != -EEXIST) {
 		l_error("netconfig: Failed to add IPv6 address. "
 				"Error %d: %s", error, strerror(-error));
 		return;
 	}
 
-	/* TODO Install routes and DNS */
+	if (!netconfig_ipv6_routes_install(netconfig)) {
+		l_error("netconfig: Failed to install IPv6 routes.");
+
+		return;
+	}
+
+	/* TODO Install DNS */
 }
 
 static void netconfig_install_address(struct netconfig *netconfig,

index 129fe518..65ba5330 100644
@@ -323,6 +323,50 @@ static char *netconfig_ipv6_get_gateway(struct netconfig *netconfig)
 	return NULL;
 }
 
+static char **netconfig_ipv6_get_dns(struct netconfig *netconfig, uint8_t proto)
+{
+	struct in6_addr in6_addr;
+	char **dns_list;
+	char **p;
+
+	switch (proto) {
+	case RTPROT_STATIC:
+		if (!netconfig->active_settings)
+			return NULL;
+
+		p = dns_list =
+			l_settings_get_string_list(netconfig->active_settings,
+							"IPv6", "dns", ' ');
+
+		if (!dns_list || !*dns_list) {
+			l_strv_free(dns_list);
+
+			return NULL;
+		}
+
+		for (; *p; p++) {
+			if (inet_pton(AF_INET6, *p, &in6_addr) == 1)
+				continue;
+
+			l_error("netconfig: Invalid IPv6 DNS address %s is "
+				"provided in network configuration file.", *p);
+
+			l_strv_free(dns_list);
+
+			return NULL;
+		}
+
+		return dns_list;
+
+	case RTPROT_DHCP:
+		/* TODO */
+
+		return NULL;
+	}
+
+	return NULL;
+}
+
 static bool netconfig_ifaddr_match(const void *a, const void *b)
 {
 	const struct netconfig_ifaddr *entry = a;

@@ -672,6 +716,7 @@ static void netconfig_ipv6_ifaddr_add_cmd_cb(int error, uint16_t type,
 						void *user_data)
 {
 	struct netconfig *netconfig = user_data;
+	char **dns;
 
 	if (error && error != -EEXIST) {
 		l_error("netconfig: Failed to add IPv6 address. "

@@ -685,7 +730,16 @@ static void netconfig_ipv6_ifaddr_add_cmd_cb(int error, uint16_t type,
 		return;
 	}
 
-	/* TODO Install DNS */
+	dns = netconfig_ipv6_get_dns(netconfig, netconfig->rtm_v6_protocol);
+	if (!dns) {
+		l_error("netconfig: Failed to obtain the DNS addresses from "
+			"%s.", netconfig->rtm_v6_protocol == RTPROT_STATIC ?
+				"setting file" : "DHCPv6 lease");
+		return;
+	}
+
+	resolve_add_dns(netconfig->ifindex, AF_INET6, dns);
+	l_strv_free(dns);
 }
 
 static void netconfig_install_address(struct netconfig *netconfig,