[NETNS][IPV6] mcast - handle several network namespace

This patch make use of the network namespace information at the right
places to handle the multicast for several network namespaces.  It
makes the socket control to be per namespace too.

Signed-off-by: Daniel Lezcano <[email protected]>
Signed-off-by: Benjamin Thery <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Daniel Lezcano

include/net/netns/ipv6.h

@@ -53,5 +53,6 @@ struct netns_ipv6 {
 	struct sock		**icmp_sk;
 	struct sock             *ndisc_sk;
 	struct sock             *tcp_sk;
+	struct sock             *igmp_sk;
 };
 #endif

net/ipv6/mcast.c

@@ -126,8 +126,6 @@ static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 /* Big mc list lock for all the sockets */
 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
 
-static struct socket *igmp6_socket;
-
 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
 
 static void igmp6_join_group(struct ifmcaddr6 *ma);
@@ -183,6 +181,7 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
 	struct net_device *dev = NULL;
 	struct ipv6_mc_socklist *mc_lst;
 	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct net *net = sk->sk_net;
 	int err;
 
 	if (!ipv6_addr_is_multicast(addr))
@@ -208,14 +207,14 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
 
 	if (ifindex == 0) {
 		struct rt6_info *rt;
-		rt = rt6_lookup(&init_net, addr, NULL, 0, 0);
+		rt = rt6_lookup(net, addr, NULL, 0, 0);
 		if (rt) {
 			dev = rt->rt6i_dev;
 			dev_hold(dev);
 			dst_release(&rt->u.dst);
 		}
 	} else
-		dev = dev_get_by_index(&init_net, ifindex);
+		dev = dev_get_by_index(net, ifindex);
 
 	if (dev == NULL) {
 		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
@@ -256,6 +255,7 @@ int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct ipv6_mc_socklist *mc_lst, **lnk;
+	struct net *net = sk->sk_net;
 
 	write_lock_bh(&ipv6_sk_mc_lock);
 	for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
@@ -266,7 +266,8 @@ int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 			*lnk = mc_lst->next;
 			write_unlock_bh(&ipv6_sk_mc_lock);
 
-			if ((dev = dev_get_by_index(&init_net, mc_lst->ifindex)) != NULL) {
+			dev = dev_get_by_index(net, mc_lst->ifindex);
+			if (dev != NULL) {
 				struct inet6_dev *idev = in6_dev_get(dev);
 
 				(void) ip6_mc_leave_src(sk, mc_lst, idev);
@@ -286,22 +287,24 @@ int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 	return -EADDRNOTAVAIL;
 }
 
-static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
+static struct inet6_dev *ip6_mc_find_dev(struct net *net,
+					 struct in6_addr *group,
+					 int ifindex)
 {
 	struct net_device *dev = NULL;
 	struct inet6_dev *idev = NULL;
 
 	if (ifindex == 0) {
 		struct rt6_info *rt;
 
-		rt = rt6_lookup(&init_net, group, NULL, 0, 0);
+		rt = rt6_lookup(net, group, NULL, 0, 0);
 		if (rt) {
 			dev = rt->rt6i_dev;
 			dev_hold(dev);
 			dst_release(&rt->u.dst);
 		}
 	} else
-		dev = dev_get_by_index(&init_net, ifindex);
+		dev = dev_get_by_index(net, ifindex);
 
 	if (!dev)
 		return NULL;
@@ -324,6 +327,7 @@ void ipv6_sock_mc_close(struct sock *sk)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct ipv6_mc_socklist *mc_lst;
+	struct net *net = sk->sk_net;
 
 	write_lock_bh(&ipv6_sk_mc_lock);
 	while ((mc_lst = np->ipv6_mc_list) != NULL) {
@@ -332,7 +336,7 @@ void ipv6_sock_mc_close(struct sock *sk)
 		np->ipv6_mc_list = mc_lst->next;
 		write_unlock_bh(&ipv6_sk_mc_lock);
 
-		dev = dev_get_by_index(&init_net, mc_lst->ifindex);
+		dev = dev_get_by_index(net, mc_lst->ifindex);
 		if (dev) {
 			struct inet6_dev *idev = in6_dev_get(dev);
 
@@ -361,6 +365,7 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
 	struct inet6_dev *idev;
 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 	struct ip6_sf_socklist *psl;
+	struct net *net = sk->sk_net;
 	int i, j, rv;
 	int leavegroup = 0;
 	int pmclocked = 0;
@@ -376,7 +381,7 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
 	if (!ipv6_addr_is_multicast(group))
 		return -EINVAL;
 
-	idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
+	idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 	if (!idev)
 		return -ENODEV;
 	dev = idev->dev;
@@ -500,6 +505,7 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 	struct inet6_dev *idev;
 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 	struct ip6_sf_socklist *newpsl, *psl;
+	struct net *net = sk->sk_net;
 	int leavegroup = 0;
 	int i, err;
 
@@ -511,7 +517,7 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 	    gsf->gf_fmode != MCAST_EXCLUDE)
 		return -EINVAL;
 
-	idev = ip6_mc_find_dev(group, gsf->gf_interface);
+	idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 
 	if (!idev)
 		return -ENODEV;
@@ -592,13 +598,14 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 	struct net_device *dev;
 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 	struct ip6_sf_socklist *psl;
+	struct net *net = sk->sk_net;
 
 	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 
 	if (!ipv6_addr_is_multicast(group))
 		return -EINVAL;
 
-	idev = ip6_mc_find_dev(group, gsf->gf_interface);
+	idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 
 	if (!idev)
 		return -ENODEV;
@@ -1393,7 +1400,8 @@ mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
 
 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
 {
-	struct sock *sk = igmp6_socket->sk;
+	struct net *net = dev->nd_net;
+	struct sock *sk = net->ipv6.igmp_sk;
 	struct sk_buff *skb;
 	struct mld2_report *pmr;
 	struct in6_addr addr_buf;
@@ -1440,6 +1448,7 @@ static void mld_sendpack(struct sk_buff *skb)
 			      (struct mld2_report *)skb_transport_header(skb);
 	int payload_len, mldlen;
 	struct inet6_dev *idev = in6_dev_get(skb->dev);
+	struct net *net = skb->dev->nd_net;
 	int err;
 	struct flowi fl;
 
@@ -1459,7 +1468,7 @@ static void mld_sendpack(struct sk_buff *skb)
 		goto err_out;
 	}
 
-	icmpv6_flow_init(igmp6_socket->sk, &fl, ICMPV6_MLD2_REPORT,
+	icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
 			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
 			 skb->dev->ifindex);
 
@@ -1753,7 +1762,8 @@ static void mld_send_cr(struct inet6_dev *idev)
 
 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
 {
-	struct sock *sk = igmp6_socket->sk;
+	struct net *net = dev->nd_net;
+	struct sock *sk = net->ipv6.igmp_sk;
 	struct inet6_dev *idev;
 	struct sk_buff *skb;
 	struct icmp6hdr *hdr;
@@ -1824,7 +1834,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
 		goto err_out;
 	}
 
-	icmpv6_flow_init(igmp6_socket->sk, &fl, type,
+	icmpv6_flow_init(sk, &fl, type,
 			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
 			 skb->dev->ifindex);
 
@@ -2334,6 +2344,7 @@ void ipv6_mc_destroy_dev(struct inet6_dev *idev)
 
 #ifdef CONFIG_PROC_FS
 struct igmp6_mc_iter_state {
+	struct seq_net_private p;
 	struct net_device *dev;
 	struct inet6_dev *idev;
 };
@@ -2344,9 +2355,10 @@ static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
 {
 	struct ifmcaddr6 *im = NULL;
 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+	struct net *net = state->p.net;
 
 	state->idev = NULL;
-	for_each_netdev(&init_net, state->dev) {
+	for_each_netdev(net, state->dev) {
 		struct inet6_dev *idev;
 		idev = in6_dev_get(state->dev);
 		if (!idev)
@@ -2448,19 +2460,20 @@ static const struct seq_operations igmp6_mc_seq_ops = {
 
 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
 {
-	return seq_open_private(file, &igmp6_mc_seq_ops,
-			sizeof(struct igmp6_mc_iter_state));
+	return seq_open_net(inode, file, &igmp6_mc_seq_ops,
+			    sizeof(struct igmp6_mc_iter_state));
 }
 
 static const struct file_operations igmp6_mc_seq_fops = {
 	.owner		=	THIS_MODULE,
 	.open		=	igmp6_mc_seq_open,
 	.read		=	seq_read,
 	.llseek		=	seq_lseek,
-	.release	=	seq_release_private,
+	.release	=	seq_release_net,
 };
 
 struct igmp6_mcf_iter_state {
+	struct seq_net_private p;
 	struct net_device *dev;
 	struct inet6_dev *idev;
 	struct ifmcaddr6 *im;
@@ -2473,10 +2486,11 @@ static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
 	struct ip6_sf_list *psf = NULL;
 	struct ifmcaddr6 *im = NULL;
 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+	struct net *net = state->p.net;
 
 	state->idev = NULL;
 	state->im = NULL;
-	for_each_netdev(&init_net, state->dev) {
+	for_each_netdev(net, state->dev) {
 		struct inet6_dev *idev;
 		idev = in6_dev_get(state->dev);
 		if (unlikely(idev == NULL))
@@ -2608,56 +2622,82 @@ static const struct seq_operations igmp6_mcf_seq_ops = {
 
 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
 {
-	return seq_open_private(file, &igmp6_mcf_seq_ops,
-			sizeof(struct igmp6_mcf_iter_state));
+	return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
+			    sizeof(struct igmp6_mcf_iter_state));
 }
 
 static const struct file_operations igmp6_mcf_seq_fops = {
 	.owner		=	THIS_MODULE,
 	.open		=	igmp6_mcf_seq_open,
 	.read		=	seq_read,
 	.llseek		=	seq_lseek,
-	.release	=	seq_release_private,
+	.release	=	seq_release_net,
 };
 #endif
 
-int __init igmp6_init(void)
+static int igmp6_net_init(struct net *net)
 {
 	struct ipv6_pinfo *np;
+	struct socket *sock;
 	struct sock *sk;
 	int err;
 
-	err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
+	err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &sock);
 	if (err < 0) {
 		printk(KERN_ERR
 		       "Failed to initialize the IGMP6 control socket (err %d).\n",
 		       err);
-		igmp6_socket = NULL; /* For safety. */
-		return err;
+		goto out;
 	}
 
-	sk = igmp6_socket->sk;
+	net->ipv6.igmp_sk = sk = sock->sk;
+	sk_change_net(sk, net);
 	sk->sk_allocation = GFP_ATOMIC;
 	sk->sk_prot->unhash(sk);
 
 	np = inet6_sk(sk);
 	np->hop_limit = 1;
 
 #ifdef CONFIG_PROC_FS
-	proc_net_fops_create(&init_net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops);
-	proc_net_fops_create(&init_net, "mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
+	err = -ENOMEM;
+	if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
+		goto out_sock_create;
+	if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
+				  &igmp6_mcf_seq_fops)) {
+		proc_net_remove(net, "igmp6");
+		goto out_sock_create;
+	}
 #endif
 
-	return 0;
+	err = 0;
+out:
+	return err;
+
+out_sock_create:
+	sk_release_kernel(net->ipv6.igmp_sk);
+	goto out;
 }
 
-void igmp6_cleanup(void)
+static void igmp6_net_exit(struct net *net)
 {
-	sock_release(igmp6_socket);
-	igmp6_socket = NULL; /* for safety */
-
+	sk_release_kernel(net->ipv6.igmp_sk);
 #ifdef CONFIG_PROC_FS
-	proc_net_remove(&init_net, "mcfilter6");
-	proc_net_remove(&init_net, "igmp6");
+	proc_net_remove(net, "mcfilter6");
+	proc_net_remove(net, "igmp6");
 #endif
 }
+
+static struct pernet_operations igmp6_net_ops = {
+	.init = igmp6_net_init,
+	.exit = igmp6_net_exit,
+};
+
+int __init igmp6_init(void)
+{
+	return register_pernet_subsys(&igmp6_net_ops);
+}
+
+void igmp6_cleanup(void)
+{
+	unregister_pernet_subsys(&igmp6_net_ops);
+}

net/ipv6/udp.c

@@ -323,6 +323,9 @@ static struct sock *udp_v6_mcast_next(struct sock *sk,
 	sk_for_each_from(s, node) {
 		struct inet_sock *inet = inet_sk(s);
 
+		if (s->sk_net != sk->sk_net)
+			continue;
+
 		if (s->sk_hash == num && s->sk_family == PF_INET6) {
 			struct ipv6_pinfo *np = inet6_sk(s);
 			if (inet->dport) {