[NETNS]: Add netns to nl_info structure.

nl_info is used to track the end-user destination of routing change
notification. This is a natural object to hold a namespace on. Place
it there and utilize the context in the appropriate places.
Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/netlink.h

@@ -217,6 +217,7 @@ struct nla_policy {
  */
 struct nl_info {
 	struct nlmsghdr		*nlh;
+	struct net		*nl_net;
 	u32			pid;
 };
 

net/ipv4/fib_frontend.c

@@ -310,6 +310,7 @@ static int rtentry_to_fib_config(int cmd, struct rtentry *rt,
 	int plen;
 
 	memset(cfg, 0, sizeof(*cfg));
+	cfg->fc_nlinfo.nl_net = &init_net;
 
 	if (rt->rt_dst.sa_family != AF_INET)
 		return -EAFNOSUPPORT;
@@ -516,6 +517,7 @@ static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 	cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
 	cfg->fc_nlinfo.nlh = nlh;
+	cfg->fc_nlinfo.nl_net = &init_net;
 
 	if (cfg->fc_type > RTN_MAX) {
 		err = -EINVAL;
@@ -670,6 +672,9 @@ static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifad
 		.fc_prefsrc = ifa->ifa_local,
 		.fc_oif = ifa->ifa_dev->dev->ifindex,
 		.fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
+		.fc_nlinfo = {
+			.nl_net = &init_net,
+		},
 	};
 
 	if (type == RTN_UNICAST)

net/ipv4/fib_semantics.c

@@ -320,11 +320,11 @@ void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
 		kfree_skb(skb);
 		goto errout;
 	}
-	err = rtnl_notify(skb, &init_net, info->pid, RTNLGRP_IPV4_ROUTE,
+	err = rtnl_notify(skb, info->nl_net, info->pid, RTNLGRP_IPV4_ROUTE,
 			  info->nlh, GFP_KERNEL);
 errout:
 	if (err < 0)
-		rtnl_set_sk_err(&init_net, RTNLGRP_IPV4_ROUTE, err);
+		rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err);
 }
 
 /* Return the first fib alias matching TOS with
@@ -531,9 +531,11 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
 
 			if (cfg->fc_scope >= RT_SCOPE_LINK)
 				return -EINVAL;
-			if (inet_addr_type(&init_net, nh->nh_gw) != RTN_UNICAST)
+			if (inet_addr_type(cfg->fc_nlinfo.nl_net,
+					   nh->nh_gw) != RTN_UNICAST)
 				return -EINVAL;
-			if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
+			if ((dev = __dev_get_by_index(cfg->fc_nlinfo.nl_net,
+						      nh->nh_oif)) == NULL)
 				return -ENODEV;
 			if (!(dev->flags&IFF_UP))
 				return -ENETDOWN;
@@ -795,7 +797,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
 		if (nhs != 1 || nh->nh_gw)
 			goto err_inval;
 		nh->nh_scope = RT_SCOPE_NOWHERE;
-		nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
+		nh->nh_dev = dev_get_by_index(cfg->fc_nlinfo.nl_net,
+					      fi->fib_nh->nh_oif);
 		err = -ENODEV;
 		if (nh->nh_dev == NULL)
 			goto failure;
@@ -809,7 +812,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
 	if (fi->fib_prefsrc) {
 		if (cfg->fc_type != RTN_LOCAL || !cfg->fc_dst ||
 		    fi->fib_prefsrc != cfg->fc_dst)
-			if (inet_addr_type(&init_net, fi->fib_prefsrc) != RTN_LOCAL)
+			if (inet_addr_type(cfg->fc_nlinfo.nl_net,
+					   fi->fib_prefsrc) != RTN_LOCAL)
 				goto err_inval;
 	}
 

net/ipv6/ip6_fib.c

@@ -1314,7 +1314,9 @@ static int fib6_walk(struct fib6_walker_t *w)
 
 static int fib6_clean_node(struct fib6_walker_t *w)
 {
-	struct nl_info info = {};
+	struct nl_info info = {
+		.nl_net = &init_net,
+	};
 	int res;
 	struct rt6_info *rt;
 	struct fib6_cleaner_t *c = container_of(w, struct fib6_cleaner_t, w);

net/ipv6/route.c

@@ -601,7 +601,9 @@ static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
 
 int ip6_ins_rt(struct rt6_info *rt)
 {
-	struct nl_info info = {};
+	struct nl_info info = {
+		.nl_net = &init_net,
+	};
 	return __ip6_ins_rt(rt, &info);
 }
 
@@ -1259,7 +1261,9 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
 
 int ip6_del_rt(struct rt6_info *rt)
 {
-	struct nl_info info = {};
+	struct nl_info info = {
+		.nl_net = &init_net,
+	};
 	return __ip6_del_rt(rt, &info);
 }