[NETNS][IPV6] addrconf - make addrconf per namespace

All the infrastructure to propagate the network namespace information
is ready. Make use of it.

There is a special case here between the initial network namespace and
the other namespaces:

* When ipv6 is initialized at boot time (aka in the init_net), it
registers to the notifier callback. So addrconf_notify will be called
as many time as there are network devices setup on the system and the
function will add ipv6 addresses to the network devices. But the first
device which needs to have its ipv6 address setup is the loopback,
unfortunatly this is not the case. So the loopback address is setup
manually in the ipv6 init function.

* With the network namespace, this ordering problem does not appears
because notifier is already setup and active, so as soon as we
register the loopback the ipv6 address is setup and it will be the
first device.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: bthery

net/ipv6/addrconf.c

@@ -561,7 +561,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 	write_lock(&addrconf_hash_lock);
 
 	/* Ignore adding duplicate addresses on an interface */
-	if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
+	if (ipv6_chk_same_addr(idev->dev->nd_net, addr, idev->dev)) {
 		ADBG(("ipv6_add_addr: already assigned\n"));
 		err = -EEXIST;
 		goto out;
@@ -751,9 +751,9 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 	if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 		struct in6_addr prefix;
 		struct rt6_info *rt;
-
+		struct net *net = ifp->idev->dev->nd_net;
 		ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
-		rt = rt6_lookup(&init_net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
+		rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 
 		if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 			if (onlink == 0) {
@@ -905,6 +905,7 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 {
 	struct ipv6_saddr_score hiscore;
 	struct inet6_ifaddr *ifa_result = NULL;
+	struct net *net = daddr_dev->nd_net;
 	int daddr_type = __ipv6_addr_type(daddr);
 	int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 	int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
@@ -916,7 +917,7 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 	read_lock(&dev_base_lock);
 	rcu_read_lock();
 
-	for_each_netdev(&init_net, dev) {
+	for_each_netdev(net, dev) {
 		struct inet6_dev *idev;
 		struct inet6_ifaddr *ifa;
 
@@ -1555,7 +1556,7 @@ addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
 		.fc_expires = expires,
 		.fc_dst_len = plen,
 		.fc_flags = RTF_UP | flags,
-		.fc_nlinfo.nl_net = &init_net,
+		.fc_nlinfo.nl_net = dev->nd_net,
 	};
 
 	ipv6_addr_copy(&cfg.fc_dst, pfx);
@@ -1582,7 +1583,7 @@ static void addrconf_add_mroute(struct net_device *dev)
 		.fc_ifindex = dev->ifindex,
 		.fc_dst_len = 8,
 		.fc_flags = RTF_UP,
-		.fc_nlinfo.nl_net = &init_net,
+		.fc_nlinfo.nl_net = dev->nd_net,
 	};
 
 	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
@@ -1599,7 +1600,7 @@ static void sit_route_add(struct net_device *dev)
 		.fc_ifindex = dev->ifindex,
 		.fc_dst_len = 96,
 		.fc_flags = RTF_UP | RTF_NONEXTHOP,
-		.fc_nlinfo.nl_net = &init_net,
+		.fc_nlinfo.nl_net = dev->nd_net,
 	};
 
 	/* prefix length - 96 bits "::d.d.d.d" */
@@ -1700,7 +1701,8 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
 
 	if (pinfo->onlink) {
 		struct rt6_info *rt;
-		rt = rt6_lookup(&init_net, &pinfo->prefix, NULL, dev->ifindex, 1);
+		rt = rt6_lookup(dev->nd_net, &pinfo->prefix, NULL,
+				dev->ifindex, 1);
 
 		if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 			if (rt->rt6i_flags&RTF_EXPIRES) {
@@ -1743,7 +1745,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
 
 ok:
 
-		ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
+		ifp = ipv6_get_ifaddr(dev->nd_net, &addr, dev, 1);
 
 		if (ifp == NULL && valid_lft) {
 			int max_addresses = in6_dev->cnf.max_addresses;
@@ -2066,6 +2068,7 @@ static void sit_add_v4_addrs(struct inet6_dev *idev)
 	struct inet6_ifaddr * ifp;
 	struct in6_addr addr;
 	struct net_device *dev;
+	struct net *net = idev->dev->nd_net;
 	int scope;
 
 	ASSERT_RTNL();
@@ -2092,7 +2095,7 @@ static void sit_add_v4_addrs(struct inet6_dev *idev)
 		return;
 	}
 
-	for_each_netdev(&init_net, dev) {
+	for_each_netdev(net, dev) {
 		struct in_device * in_dev = __in_dev_get_rtnl(dev);
 		if (in_dev && (dev->flags & IFF_UP)) {
 			struct in_ifaddr * ifa;
@@ -2255,15 +2258,16 @@ ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
 {
 	struct net_device *link_dev;
+	struct net *net = idev->dev->nd_net;
 
 	/* first try to inherit the link-local address from the link device */
 	if (idev->dev->iflink &&
-	    (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
+	    (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
 		if (!ipv6_inherit_linklocal(idev, link_dev))
 			return;
 	}
 	/* then try to inherit it from any device */
-	for_each_netdev(&init_net, link_dev) {
+	for_each_netdev(net, link_dev) {
 		if (!ipv6_inherit_linklocal(idev, link_dev))
 			return;
 	}
@@ -2296,9 +2300,6 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 	int run_pending = 0;
 	int err;
 
-	if (dev->nd_net != &init_net)
-		return NOTIFY_DONE;
-
 	switch(event) {
 	case NETDEV_REGISTER:
 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
@@ -3056,9 +3057,6 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 	struct in6_addr *pfx;
 	int err;
 
-	if (net != &init_net)
-		return -EINVAL;
-
 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
 	if (err < 0)
 		return err;
@@ -3121,9 +3119,6 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 	u8 ifa_flags;
 	int err;
 
-	if (net != &init_net)
-		return -EINVAL;
-
 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
 	if (err < 0)
 		return err;
@@ -3324,12 +3319,13 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
 	struct inet6_ifaddr *ifa;
 	struct ifmcaddr6 *ifmca;
 	struct ifacaddr6 *ifaca;
+	struct net *net = skb->sk->sk_net;
 
 	s_idx = cb->args[0];
 	s_ip_idx = ip_idx = cb->args[1];
 
 	idx = 0;
-	for_each_netdev(&init_net, dev) {
+	for_each_netdev(net, dev) {
 		if (idx < s_idx)
 			goto cont;
 		if (idx > s_idx)
@@ -3396,35 +3392,23 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
 
 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 {
-	struct net *net = skb->sk->sk_net;
 	enum addr_type_t type = UNICAST_ADDR;
 
-	if (net != &init_net)
-		return 0;
-
 	return inet6_dump_addr(skb, cb, type);
 }
 
 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
 {
-	struct net *net = skb->sk->sk_net;
 	enum addr_type_t type = MULTICAST_ADDR;
 
-	if (net != &init_net)
-		return 0;
-
 	return inet6_dump_addr(skb, cb, type);
 }
 
 
 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
 {
-	struct net *net = skb->sk->sk_net;
 	enum addr_type_t type = ANYCAST_ADDR;
 
-	if (net != &init_net)
-		return 0;
-
 	return inet6_dump_addr(skb, cb, type);
 }
 
@@ -3440,9 +3424,6 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 	struct sk_buff *skb;
 	int err;
 
-	if (net != &init_net)
-		return -EINVAL;
-
 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
 	if (err < 0)
 		goto errout;
@@ -3455,7 +3436,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 
 	ifm = nlmsg_data(nlh);
 	if (ifm->ifa_index)
-		dev = __dev_get_by_index(&init_net, ifm->ifa_index);
+		dev = __dev_get_by_index(net, ifm->ifa_index);
 
 	if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
 		err = -EADDRNOTAVAIL;
@@ -3475,7 +3456,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 		kfree_skb(skb);
 		goto errout_ifa;
 	}
-	err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
+	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
 errout_ifa:
 	in6_ifa_put(ifa);
 errout:
@@ -3485,6 +3466,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
 {
 	struct sk_buff *skb;
+	struct net *net = ifa->idev->dev->nd_net;
 	int err = -ENOBUFS;
 
 	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
@@ -3498,10 +3480,10 @@ static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
 		kfree_skb(skb);
 		goto errout;
 	}
-	err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+	err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
 errout:
 	if (err < 0)
-		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
+		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
 }
 
 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
@@ -3666,12 +3648,9 @@ static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 	struct net_device *dev;
 	struct inet6_dev *idev;
 
-	if (net != &init_net)
-		return 0;
-
 	read_lock(&dev_base_lock);
 	idx = 0;
-	for_each_netdev(&init_net, dev) {
+	for_each_netdev(net, dev) {
 		if (idx < s_idx)
 			goto cont;
 		if ((idev = in6_dev_get(dev)) == NULL)
@@ -3693,6 +3672,7 @@ static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
 {
 	struct sk_buff *skb;
+	struct net *net = idev->dev->nd_net;
 	int err = -ENOBUFS;
 
 	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
@@ -3706,10 +3686,10 @@ void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
 		kfree_skb(skb);
 		goto errout;
 	}
-	err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+	err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
 errout:
 	if (err < 0)
-		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
+		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
 }
 
 static inline size_t inet6_prefix_nlmsg_size(void)
@@ -3762,6 +3742,7 @@ static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 			 struct prefix_info *pinfo)
 {
 	struct sk_buff *skb;
+	struct net *net = idev->dev->nd_net;
 	int err = -ENOBUFS;
 
 	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
@@ -3775,10 +3756,10 @@ static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 		kfree_skb(skb);
 		goto errout;
 	}
-	err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
+	err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
 errout:
 	if (err < 0)
-		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
+		rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
 }
 
 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
@@ -4276,7 +4257,26 @@ static int addrconf_net_init(struct net *net)
 
 static void addrconf_net_exit(struct net *net)
 {
-	;
+	struct net_device *dev;
+
+	/*
+	 * Remove loopback references from default routing entries
+	 */
+/* 	in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev); */
+/* #ifdef CONFIG_IPV6_MULTIPLE_TABLES */
+/* 	in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev); */
+/* 	in6_dev_put(net->ipv6.ip6_blk_hole_entry->rt6i_idev); */
+/* #endif */
+
+	rtnl_lock();
+	/* clean dev list */
+	for_each_netdev(net, dev) {
+		if (__in6_dev_get(dev) == NULL)
+			continue;
+		addrconf_ifdown(dev, 1);
+	}
+	addrconf_ifdown(net->loopback_dev, 2);
+	rtnl_unlock();
 }
 
 static struct pernet_operations addrconf_net_ops = {
@@ -4357,7 +4357,6 @@ int __init addrconf_init(void)
 
 void addrconf_cleanup(void)
 {
-	struct net_device *dev;
 	struct inet6_ifaddr *ifa;
 	int i;
 
@@ -4368,21 +4367,9 @@ void addrconf_cleanup(void)
 
 	rtnl_lock();
 
-	/*
-	 *	clean dev list.
-	 */
-
-	for_each_netdev(&init_net, dev) {
-		if (__in6_dev_get(dev) == NULL)
-			continue;
-		addrconf_ifdown(dev, 1);
-	}
-	addrconf_ifdown(init_net.loopback_dev, 2);
-
 	/*
 	 *	Check hash table.
 	 */
-
 	write_lock_bh(&addrconf_hash_lock);
 	for (i=0; i < IN6_ADDR_HSIZE; i++) {
 		for (ifa=inet6_addr_lst[i]; ifa; ) {