From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 26 Feb 2012 16:43:10 +0000 (+0100)
Subject: move broadcast address handling to the core
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=73a32ab092ae32ec97e20b61512998c8411b8bd5;p=oweals%2Fnetifd.git

move broadcast address handling to the core
---

diff --git a/interface-ip.c b/interface-ip.c
index 93e8723..7f10120 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -124,28 +124,51 @@ interface_update_proto_addr(struct vlist_tree *tree,
 	struct interface_ip_settings *ip;
 	struct interface *iface;
 	struct device *dev;
-	struct device_addr *addr;
+	struct device_addr *a_new = NULL, *a_old = NULL;
 	bool keep = false;
 
 	ip = container_of(tree, struct interface_ip_settings, addr);
 	iface = ip->iface;
 	dev = iface->l3_dev->dev;
 
-	if (node_old && node_new)
+	if (node_new) {
+		a_new = container_of(node_new, struct device_addr, node);
+
+		if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
+		    !a_new->broadcast) {
+
+			uint32_t mask = ~0;
+			uint32_t *a = (uint32_t *) &a_new->addr;
+
+			mask >>= a_new->mask;
+			a_new->broadcast = *a | mask;
+		}
+	}
+
+	if (node_old)
+		a_old = container_of(node_old, struct device_addr, node);
+
+	if (a_new && a_old) {
 		keep = true;
 
+		if (a_old->flags != a_new->flags)
+			keep = false;
+
+		if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
+		    a_new->broadcast != a_old->broadcast)
+			keep = false;
+	}
+
 	if (node_old) {
-		addr = container_of(node_old, struct device_addr, node);
-		if (!(addr->flags & DEVADDR_EXTERNAL) && addr->enabled && !keep)
-			system_del_address(dev, addr);
-		free(addr);
+		if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep)
+			system_del_address(dev, a_old);
+		free(a_old);
 	}
 
 	if (node_new) {
-		addr = container_of(node_new, struct device_addr, node);
-		if (!(addr->flags & DEVADDR_EXTERNAL) && !keep)
-			system_add_address(dev, addr);
-		addr->enabled = true;
+		if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep)
+			system_add_address(dev, a_new);
+		a_new->enabled = true;
 	}
 }
 
diff --git a/interface-ip.h b/interface-ip.h
index f6413ee..e983a84 100644
--- a/interface-ip.h
+++ b/interface-ip.h
@@ -27,6 +27,9 @@ struct device_addr {
 	enum device_addr_flags flags;
 	bool enabled;
 
+	/* ipv4 only */
+	uint32_t broadcast;
+
 	/* must be last */
 	unsigned int mask;
 	union if_addr addr;
diff --git a/proto.c b/proto.c
index 81469f9..c100735 100644
--- a/proto.c
+++ b/proto.c
@@ -123,7 +123,8 @@ proto_parse_ip_addr_string(const char *str, bool v6, int mask)
 }
 
 static bool
-parse_addr(struct interface *iface, const char *str, bool v6, int mask, bool ext)
+parse_addr(struct interface *iface, const char *str, bool v6, int mask,
+	   bool ext, uint32_t broadcast)
 {
 	struct device_addr *addr;
 
@@ -133,6 +134,9 @@ parse_addr(struct interface *iface, const char *str, bool v6, int mask, bool ext
 		return false;
 	}
 
+	if (broadcast)
+		addr->broadcast = broadcast;
+
 	if (ext)
 		addr->flags |= DEVADDR_EXTERNAL;
 
@@ -141,7 +145,8 @@ parse_addr(struct interface *iface, const char *str, bool v6, int mask, bool ext
 }
 
 static int
-parse_address_option(struct interface *iface, struct blob_attr *attr, bool v6, int netmask, bool ext)
+parse_address_option(struct interface *iface, struct blob_attr *attr, bool v6,
+		     int netmask, bool ext, uint32_t broadcast)
 {
 	struct blob_attr *cur;
 	int n_addr = 0;
@@ -152,7 +157,8 @@ parse_address_option(struct interface *iface, struct blob_attr *attr, bool v6, i
 			return -1;
 
 		n_addr++;
-		if (!parse_addr(iface, blobmsg_data(cur), v6, netmask, ext))
+		if (!parse_addr(iface, blobmsg_data(cur), v6, netmask, ext,
+				broadcast))
 			return -1;
 	}
 
@@ -188,6 +194,7 @@ proto_apply_ip_settings(struct interface *iface, struct blob_attr *attr, bool ex
 	const char *error;
 	unsigned int netmask = 32;
 	int n_v4 = 0, n_v6 = 0;
+	uint32_t broadcast = 0;
 
 	blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 
@@ -200,10 +207,12 @@ proto_apply_ip_settings(struct interface *iface, struct blob_attr *attr, bool ex
 	}
 
 	if (tb[OPT_IPADDR])
-		n_v4 = parse_address_option(iface, tb[OPT_IPADDR], false, netmask, ext);
+		n_v4 = parse_address_option(iface, tb[OPT_IPADDR], false,
+			netmask, ext, broadcast);
 
 	if (tb[OPT_IP6ADDR])
-		n_v6 = parse_address_option(iface, tb[OPT_IP6ADDR], true, netmask, ext);
+		n_v6 = parse_address_option(iface, tb[OPT_IP6ADDR], true,
+			netmask, ext, 0);
 
 	if (!n_v4 && !n_v6) {
 		error = "NO_ADDRESS";
diff --git a/system-linux.c b/system-linux.c
index 0a989b0..28029c1 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -823,13 +823,8 @@ static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 
 	nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 	nla_put(msg, IFA_LOCAL, alen, &addr->addr);
-	if (v4) {
-		uint32_t mask = ~0;
-		uint32_t *a = (uint32_t *) &addr->addr;
-
-		mask >>= addr->mask;
-		nla_put_u32(msg, IFA_BROADCAST, *a | mask);
-	}
+	if (v4)
+		nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 
 	return system_rtnl_call(msg);
 }