From: Hans Dedecker <dedeckeh@gmail.com>
Date: Wed, 18 Jun 2014 07:41:14 +0000 (+0000)
Subject: netifd: Fix macvlan delete via netlink
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=55b39e8c0a650146ebb416d0656b271e409eff2b;p=project%2Fnetifd.git

netifd: Fix macvlan delete via netlink

Fix macvlan delete via netlink as netlink attribute IFLA_IFNAME data size was incorrect (size reject by the kernel) and NLM_F_REQUEST flag was missing.
In addition some minor improvements (attribute IFLA_INFO_KIND can be left out as RTM_DELLINK does not require the attribute)

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
---

diff --git a/system-linux.c b/system-linux.c
index ea71f65..4d0f4c9 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -691,7 +691,7 @@ int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvla
 {
 	struct nl_msg *msg;
 	struct nlattr *linkinfo, *data;
-	struct ifinfomsg iim = { .ifi_family = AF_INET };
+	struct ifinfomsg iim = { .ifi_family = AF_UNSPEC, };
 	int ifindex = system_if_resolve(dev);
 	int i, rv;
 	static const struct {
@@ -716,13 +716,13 @@ int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvla
 
 	if (cfg->flags & MACVLAN_OPT_MACADDR)
 		nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
-	nla_put(msg, IFLA_IFNAME, IFNAMSIZ, macvlan->ifname);
+	nla_put_string(msg, IFLA_IFNAME, macvlan->ifname);
 	nla_put_u32(msg, IFLA_LINK, ifindex);
 
 	if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 		goto nla_put_failure;
 
-	nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan");
+	nla_put_string(msg, IFLA_INFO_KIND, "macvlan");
 
 	if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 		goto nla_put_failure;
@@ -754,20 +754,19 @@ nla_put_failure:
 int system_macvlan_del(struct device *macvlan)
 {
 	struct nl_msg *msg;
-	struct ifinfomsg iim;
-
-	iim.ifi_family = AF_INET;
-	iim.ifi_index  = 0;
+	struct ifinfomsg iim = {
+		.ifi_family = AF_UNSPEC,
+		.ifi_index = 0,
+	};
 
-	msg = nlmsg_alloc_simple(RTM_DELLINK, 0);
+	msg = nlmsg_alloc_simple(RTM_DELLINK, NLM_F_REQUEST);
 
 	if (!msg)
 		return -1;
 
 	nlmsg_append(msg, &iim, sizeof(iim), 0);
 
-	nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan");
-	nla_put(msg, IFLA_IFNAME, sizeof(macvlan->ifname), macvlan->ifname);
+	nla_put_string(msg, IFLA_IFNAME, macvlan->ifname);
 
 	system_rtnl_call(msg);