[IPV6]: Always pass a valid nl_info to inet6_rt_notify.

This makes the code in the inet6_rt_notify more straightforward and provides
groud for namespace passing.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_fib.c

@@ -1315,6 +1315,7 @@ static int fib6_walk(struct fib6_walker_t *w)
 
 static int fib6_clean_node(struct fib6_walker_t *w)
 {
+	struct nl_info info = {};
 	int res;
 	struct rt6_info *rt;
 	struct fib6_cleaner_t *c = container_of(w, struct fib6_cleaner_t, w);
@@ -1323,7 +1324,7 @@ static int fib6_clean_node(struct fib6_walker_t *w)
 		res = c->func(rt, c->arg);
 		if (res < 0) {
 			w->leaf = rt;
-			res = fib6_del(rt, NULL);
+			res = fib6_del(rt, &info);
 			if (res) {
 #if RT6_DEBUG >= 2
 				printk(KERN_DEBUG "fib6_clean_node: del failed: rt=%p@%p err=%d\n", rt, rt->rt6i_node, res);

net/ipv6/route.c

@@ -609,7 +609,8 @@ static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
 
 int ip6_ins_rt(struct rt6_info *rt)
 {
-	return __ip6_ins_rt(rt, NULL);
+	struct nl_info info = {};
+	return __ip6_ins_rt(rt, &info);
 }
 
 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
@@ -1266,7 +1267,8 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 
 int ip6_del_rt(struct rt6_info *rt)
 {
-	return __ip6_del_rt(rt, NULL);
+	struct nl_info info = {};
+	return __ip6_del_rt(rt, &info);
 }
 
 static int ip6_route_del(struct fib6_config *cfg)
@@ -2243,29 +2245,26 @@ errout:
 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
 {
 	struct sk_buff *skb;
-	u32 pid = 0, seq = 0;
-	struct nlmsghdr *nlh = NULL;
-	int err = -ENOBUFS;
-
-	if (info) {
-		pid = info->pid;
-		nlh = info->nlh;
-		if (nlh)
-			seq = nlh->nlmsg_seq;
-	}
+	u32 seq;
+	int err;
+
+	err = -ENOBUFS;
+	seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0;
 
 	skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
 	if (skb == NULL)
 		goto errout;
 
-	err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
+	err = rt6_fill_node(skb, rt, NULL, NULL, 0,
+				event, info->pid, seq, 0, 0);
 	if (err < 0) {
 		/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
 		WARN_ON(err == -EMSGSIZE);
 		kfree_skb(skb);
 		goto errout;
 	}
-	err = rtnl_notify(skb, &init_net, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
+	err = rtnl_notify(skb, &init_net, info->pid,
+				RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any());
 errout:
 	if (err < 0)
 		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err);