X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fnetifd.git;a=blobdiff_plain;f=interface-ip.c;h=24ea054942e54157ac720340a681eb4ee8784c54;hp=c4514b0377edc7d1055c125347c01f6f1ead5045;hb=c99182e96d2b66bab77d9eb9584ca7e0211966aa;hpb=b3f60b48501319e93e846bbf23881666cee947bc

diff --git a/interface-ip.c b/interface-ip.c
index c4514b0..24ea054 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -99,7 +99,7 @@ match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
 
 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
 		const union if_addr *addr, uint8_t mask, unsigned int table,
-		struct interface *in_iface, const char *action)
+		struct interface *in_iface, const char *action, bool src)
 {
 	struct iprule rule = {
 		.flags = IPRULE_PRIORITY,
@@ -107,9 +107,15 @@ static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
 	};
 
 	if (addr) {
-		rule.flags |= IPRULE_SRC;
-		rule.src_addr = *addr;
-		rule.src_mask = mask;
+		if (src) {
+			rule.flags |= IPRULE_SRC;
+			rule.src_addr = *addr;
+			rule.src_mask = mask;
+		} else {
+			rule.flags |= IPRULE_DEST;
+			rule.dest_addr = *addr;
+			rule.dest_mask = mask;
+		}
 	}
 
 	if (table) {
@@ -274,6 +280,24 @@ done:
 	return iface;
 }
 
+static void
+interface_set_route_info(struct interface *iface, struct device_route *route)
+{
+	bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
+
+	if (!iface)
+		return;
+
+	if (!(route->flags & DEVROUTE_METRIC))
+		route->metric = iface->metric;
+
+	if (!(route->flags & DEVROUTE_TABLE)) {
+		route->table = (v6) ? iface->ip6table : iface->ip4table;
+		if (route->table)
+			route->flags |= DEVROUTE_SRCTABLE;
+	}
+}
+
 void
 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 {
@@ -281,7 +305,6 @@ interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 	struct blob_attr *tb[__ROUTE_MAX], *cur;
 	struct device_route *route;
 	int af = v6 ? AF_INET6 : AF_INET;
-	bool is_proto_route = !!iface;
 
 	blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 
@@ -327,8 +350,7 @@ interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 	if ((cur = tb[ROUTE_METRIC]) != NULL) {
 		route->metric = blobmsg_get_u32(cur);
 		route->flags |= DEVROUTE_METRIC;
-	} else
-		route->metric = iface->metric;
+	}
 
 	if ((cur = tb[ROUTE_MTU]) != NULL) {
 		route->mtu = blobmsg_get_u32(cur);
@@ -344,7 +366,7 @@ interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 		const char *mask = strtok_r(NULL, "/", &saveptr);
 
 		if (!addr || inet_pton(af, addr, &route->source) < 1) {
-			DPRINTF("Failed to parse route source: %s\n", addr);
+			DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
 			goto error;
 		}
 
@@ -354,11 +376,6 @@ interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 	if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
 		route->flags |= DEVROUTE_ONLINK;
 
-	if (is_proto_route) {
-		route->table = (v6) ? iface->ip6table : iface->ip4table;
-		route->flags |= DEVROUTE_SRCTABLE;
-	}
-
 	if ((cur = tb[ROUTE_TABLE]) != NULL) {
 		if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 			DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
@@ -388,6 +405,7 @@ interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 		route->flags |= DEVROUTE_TYPE;
 	}
 
+	interface_set_route_info(iface, route);
 	vlist_add(&ip->route, &route->node, route);
 	return;
 
@@ -440,28 +458,46 @@ static void
 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 {
 	struct device *dev = iface->l3_dev.dev;
-	struct device_route route;
+	struct device_route *r = &addr->subnet;
 
 	if (addr->flags & DEVADDR_OFFLINK)
 		return;
 
-	memset(&route, 0, sizeof(route));
-	route.iface = iface;
-	route.flags = addr->flags;
-	route.mask = addr->mask;
-	memcpy(&route.addr, &addr->addr, sizeof(route.addr));
-	clear_if_addr(&route.addr, route.mask);
-
-	if (add) {
-		route.flags |= DEVADDR_KERNEL;
-		system_del_route(dev, &route);
+	if (!add) {
+		if (!addr->subnet.iface)
+			return;
 
-		route.flags &= ~DEVADDR_KERNEL;
-		route.metric = iface->metric;
-		system_add_route(dev, &route);
-	} else {
-		system_del_route(dev, &route);
+		system_del_route(dev, r);
+		memset(r, 0, sizeof(*r));
+		return;
 	}
+
+	r->iface = iface;
+	r->flags = addr->flags;
+	r->mask = addr->mask;
+	memcpy(&r->addr, &addr->addr, sizeof(r->addr));
+	clear_if_addr(&r->addr, r->mask);
+
+	r->flags |= DEVADDR_KERNEL;
+	system_del_route(dev, r);
+
+	r->flags &= ~DEVADDR_KERNEL;
+	interface_set_route_info(iface, r);
+
+	system_add_route(dev, r);
+}
+
+static void
+interface_add_addr_rules(struct device_addr *addr, bool enabled)
+{
+	bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
+
+	set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
+			     (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
+			     true);
+	set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
+			     &addr->addr, addr->mask, addr->policy_table, NULL,
+			     NULL, false);
 }
 
 static void
@@ -524,16 +560,12 @@ interface_update_proto_addr(struct vlist_tree *tree,
 
 	if (node_old) {
 		if (a_old->enabled && !keep) {
-			if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
-				v6 = true;
-
 			//This is needed for source routing to work correctly. If a device
 			//has two connections to a network using the same subnet, adding
 			//only the network-rule will cause packets to be routed through the
 			//first matching network (source IP matches both masks).
 			if (a_old->policy_table)
-				set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
-						(v6) ? 128 : 32, a_old->policy_table, NULL, NULL);
+				interface_add_addr_rules(a_old, false);
 
 			if (!(a_old->flags & DEVADDR_EXTERNAL)) {
 				interface_handle_subnet_route(iface, a_old, false);
@@ -557,14 +589,13 @@ interface_update_proto_addr(struct vlist_tree *tree,
 				if (system_add_address(dev, a_new))
 					a_new->failed = true;
 
-				if (iface->metric)
+				if (iface->metric || a_new->policy_table)
 					interface_handle_subnet_route(iface, a_new, true);
 			}
 
 			if (!keep) {
 				if (a_new->policy_table)
-					set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
-							(v6) ? 128 : 32, a_new->policy_table, NULL, NULL);
+					interface_add_addr_rules(a_new, true);
 			}
 		}
 	}
@@ -734,6 +765,7 @@ interface_set_prefix_address(struct device_prefix_assignment *assignment,
 	route.mask = addr.mask < 64 ? 64 : addr.mask;
 	route.addr = addr.addr;
 	clear_if_addr(&route.addr, route.mask);
+	interface_set_route_info(iface, &route);
 
 	if (!add && assignment->enabled) {
 		time_t now = system_get_rtime();
@@ -744,10 +776,10 @@ interface_set_prefix_address(struct device_prefix_assignment *assignment,
 		if (prefix->iface) {
 			if (prefix->iface->ip6table)
 				set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
-						addr.mask, prefix->iface->ip6table, iface, NULL);
+						addr.mask, prefix->iface->ip6table, iface, NULL, true);
 
 			set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
-							addr.mask, 0, iface, "unreachable");
+							addr.mask, 0, iface, "unreachable", true);
 		}
 
 		system_del_route(l3_downlink, &route);
@@ -759,11 +791,11 @@ interface_set_prefix_address(struct device_prefix_assignment *assignment,
 
 		if (prefix->iface && !assignment->enabled) {
 			set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
-					addr.mask, 0, iface, "unreachable");
+					addr.mask, 0, iface, "unreachable", true);
 
 			if (prefix->iface->ip6table)
 				set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
-						addr.mask, prefix->iface->ip6table, iface, NULL);
+						addr.mask, prefix->iface->ip6table, iface, NULL, true);
 		}
 
 		route.metric = iface->metric;
@@ -825,6 +857,9 @@ static void interface_update_prefix_assignments(struct device_prefix *prefix, bo
 
 	// End-of-assignment sentinel
 	c = malloc(sizeof(*c) + 1);
+	if (!c)
+		return;
+
 	c->assigned = 1 << (64 - prefix->length);
 	c->length = 64;
 	c->name[0] = 0;
@@ -835,12 +870,14 @@ static void interface_update_prefix_assignments(struct device_prefix *prefix, bo
 	if (prefix->excl_length > 0) {
 		const char name[] = "!excluded";
 		c = malloc(sizeof(*c) + sizeof(name));
-		c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
-				((1 << (64 - prefix->length)) - 1);
-		c->length = prefix->excl_length;
-		c->addr = in6addr_any;
-		memcpy(c->name, name, sizeof(name));
-		list_add(&c->head, &prefix->assignments);
+		if (c) {
+			c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
+					((1 << (64 - prefix->length)) - 1);
+			c->length = prefix->excl_length;
+			c->addr = in6addr_any;
+			memcpy(c->name, name, sizeof(name));
+			list_add(&c->head, &prefix->assignments);
+		}
 	}
 
 	bool assigned_any = false;
@@ -868,6 +905,9 @@ static void interface_update_prefix_assignments(struct device_prefix *prefix, bo
 
 		size_t namelen = strlen(iface->name) + 1;
 		c = malloc(sizeof(*c) + namelen);
+		if (!c)
+			continue;
+
 		c->length = iface->assignment_length;
 		c->assigned = iface->assignment_hint;
 		c->addr = in6addr_any;
@@ -1001,6 +1041,9 @@ interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 		pclass = (iface) ? iface->name : "local";
 
 	struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
+	if (!prefix)
+		return NULL;
+
 	prefix->length = length;
 	prefix->addr = *addr;
 	prefix->preferred_until = preferred_until;
@@ -1154,21 +1197,33 @@ write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char
 	}
 }
 
-void
-interface_write_resolv_conf(void)
+/* Sorting of interface resolver entries :               */
+/* Primary on interface dns_metric : lowest metric first */
+/* Secondary on interface metric : lowest metric first   */
+/* Finally alphabetical order of interface names         */
+static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
+{
+	const struct interface *iface1 = k1, *iface2 = k2;
+
+	if (iface1->dns_metric != iface2->dns_metric)
+		return iface1->dns_metric - iface2->dns_metric;
+
+	if (iface1->metric != iface2->metric)
+		return iface1->metric - iface2->metric;
+
+	return strcmp(iface1->name, iface2->name);
+}
+
+static void
+__interface_write_dns_entries(FILE *f)
 {
 	struct interface *iface;
-	char *path = alloca(strlen(resolv_conf) + 5);
-	FILE *f;
-	uint32_t crcold, crcnew;
+	struct {
+		struct avl_node node;
+	} *entry, *n_entry;
+	struct avl_tree resolv_conf_iface_entries;
 
-	sprintf(path, "%s.tmp", resolv_conf);
-	unlink(path);
-	f = fopen(path, "w+");
-	if (!f) {
-		D(INTERFACE, "Failed to open %s for writing\n", path);
-		return;
-	}
+	avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
 
 	vlist_for_each_element(&interfaces, iface, node) {
 		if (iface->state != IFS_UP)
@@ -1176,15 +1231,50 @@ interface_write_resolv_conf(void)
 
 		if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 		    vlist_simple_empty(&iface->proto_ip.dns_servers) &&
-			vlist_simple_empty(&iface->config_ip.dns_search) &&
+		    vlist_simple_empty(&iface->config_ip.dns_search) &&
 		    vlist_simple_empty(&iface->config_ip.dns_servers))
 			continue;
 
+		entry = calloc(1, sizeof(*entry));
+		if (!entry)
+			continue;
+
+		entry->node.key = iface;
+		avl_insert(&resolv_conf_iface_entries, &entry->node);
+	}
+
+	avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
+		iface = (struct interface *)entry->node.key;
+
 		fprintf(f, "# Interface %s\n", iface->name);
+
 		write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
+
 		if (!iface->proto_ip.no_dns)
 			write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
 	}
+
+	avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
+		free(entry);
+}
+
+void
+interface_write_resolv_conf(void)
+{
+	char *path = alloca(strlen(resolv_conf) + 5);
+	FILE *f;
+	uint32_t crcold, crcnew;
+
+	sprintf(path, "%s.tmp", resolv_conf);
+	unlink(path);
+	f = fopen(path, "w+");
+	if (!f) {
+		D(INTERFACE, "Failed to open %s for writing\n", path);
+		return;
+	}
+
+	__interface_write_dns_entries(f);
+
 	fflush(f);
 	rewind(f);
 	crcnew = crc32_file(f);
@@ -1221,25 +1311,27 @@ void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 	vlist_for_each_element(&ip->addr, addr, node) {
 		bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
 
+		if (addr->flags & DEVADDR_EXTERNAL)
+			continue;
+
 		if (addr->enabled == enabled)
 			continue;
 
 		if (enabled) {
 			system_add_address(dev, addr);
-			if (iface->metric)
-				interface_handle_subnet_route(iface, addr, true);
 
 			addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
+			if (iface->metric || addr->policy_table)
+				interface_handle_subnet_route(iface, addr, true);
+
 			if (addr->policy_table)
-				set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
-						(v6) ? 128 : 32, addr->policy_table, NULL, NULL);
+				interface_add_addr_rules(addr, true);
 		} else {
 			interface_handle_subnet_route(iface, addr, false);
 			system_del_address(dev, addr);
 
 			if (addr->policy_table)
-				set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
-						(v6) ? 128 : 32, addr->policy_table, NULL, NULL);
+				interface_add_addr_rules(addr, false);
 		}
 		addr->enabled = enabled;
 	}
@@ -1247,6 +1339,9 @@ void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 	vlist_for_each_element(&ip->route, route, node) {
 		bool _enabled = enabled;
 
+		if (route->flags & DEVADDR_EXTERNAL)
+			continue;
+
 		if (!enable_route(ip, route))
 			_enabled = false;
 
@@ -1254,17 +1349,7 @@ void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 			continue;
 
 		if (_enabled) {
-			if (!(route->flags & DEVROUTE_METRIC))
-				route->metric = ip->iface->metric;
-
-			if (!(route->flags & DEVROUTE_TABLE)) {
-				route->flags &= ~DEVROUTE_SRCTABLE;
-				route->table = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ?
-							iface->ip6table : iface->ip4table;
-
-				if (route->table)
-					route->flags |= DEVROUTE_SRCTABLE;
-			}
+			interface_set_route_info(ip->iface, route);
 
 			if (system_add_route(dev, route))
 				route->failed = true;
@@ -1280,12 +1365,14 @@ void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 			if (!strcmp(a->name, ip->iface->name))
 				interface_set_prefix_address(a, c, ip->iface, enabled);
 
-	if (ip->iface && ip->iface->l3_dev.dev) {
+	if (ip->iface && ip->iface->policy_rules_set != enabled &&
+	    ip->iface->l3_dev.dev) {
 		set_ip_lo_policy(enabled, true, ip->iface);
 		set_ip_lo_policy(enabled, false, ip->iface);
 
 		set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
-			NULL, 0, 0, ip->iface, "failed_policy");
+			NULL, 0, 0, ip->iface, "failed_policy", true);
+		ip->iface->policy_rules_set = enabled;
 	}
 }