[PATCH 7/17] [NETNS]: Disable multicaststing configuration inside namespace.

["Denis V. Lunev" <den@openvz.org>]

Do not calls hooks from device notifiers and disallow configuration from
ioctl/netlink layer.

Signed-off-by: Denis V. Lunev <den@openvz.org>
---
 net/ipv4/igmp.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 994648b..fe2e6cd 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1199,6 +1199,9 @@ void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
 
 	ASSERT_RTNL();
 
+	if (in_dev->dev->nd_net != &init_net)
+		return;
+
 	for (im=in_dev->mc_list; im; im=im->next) {
 		if (im->multiaddr == addr) {
 			im->users++;
@@ -1278,6 +1281,9 @@ void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
 
 	ASSERT_RTNL();
 
+	if (in_dev->dev->nd_net != &init_net)
+		return;
+
 	for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
 		if (i->multiaddr==addr) {
 			if (--i->users == 0) {
@@ -1305,6 +1311,9 @@ void ip_mc_down(struct in_device *in_dev)
 
 	ASSERT_RTNL();
 
+	if (in_dev->dev->nd_net != &init_net)
+		return;
+
 	for (i=in_dev->mc_list; i; i=i->next)
 		igmp_group_dropped(i);
 
@@ -1325,6 +1334,9 @@ void ip_mc_init_dev(struct in_device *in_dev)
 {
 	ASSERT_RTNL();
 
+	if (in_dev->dev->nd_net != &init_net)
+		return;
+
 	in_dev->mc_tomb = NULL;
 #ifdef CONFIG_IP_MULTICAST
 	in_dev->mr_gq_running = 0;
@@ -1348,6 +1360,9 @@ void ip_mc_up(struct in_device *in_dev)
 
 	ASSERT_RTNL();
 
+	if (in_dev->dev->nd_net != &init_net)
+		return;
+
 	ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
 
 	for (i=in_dev->mc_list; i; i=i->next)
@@ -1364,6 +1379,9 @@ void ip_mc_destroy_dev(struct in_device *in_dev)
 
 	ASSERT_RTNL();
 
+	if (in_dev->dev->nd_net != &init_net)
+		return;
+
 	/* Deactivate timers */
 	ip_mc_down(in_dev);
 
@@ -1745,6 +1763,9 @@ int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
 	if (!ipv4_is_multicast(addr))
 		return -EINVAL;
 
+	if (sk->sk_net != &init_net)
+		return -EPROTONOSUPPORT;
+
 	rtnl_lock();
 
 	in_dev = ip_mc_find_dev(imr);
@@ -1813,6 +1834,9 @@ int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
 	u32 ifindex;
 	int ret = -EADDRNOTAVAIL;
 
+	if (sk->sk_net != &init_net)
+		return -EPROTONOSUPPORT;
+
 	rtnl_lock();
 	in_dev = ip_mc_find_dev(imr);
 	ifindex = imr->imr_ifindex;
@@ -1858,6 +1882,9 @@ int ip_mc_source(int add, int omode, struct sock *sk, struct
 	if (!ipv4_is_multicast(addr))
 		return -EINVAL;
 
+	if (sk->sk_net != &init_net)
+		return -EPROTONOSUPPORT;
+
 	rtnl_lock();
 
 	imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
@@ -1991,6 +2018,9 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
 	    msf->imsf_fmode != MCAST_EXCLUDE)
 		return -EINVAL;
 
+	if (sk->sk_net != &init_net)
+		return -EPROTONOSUPPORT;
+
 	rtnl_lock();
 
 	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
@@ -2071,6 +2101,9 @@ int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 	if (!ipv4_is_multicast(addr))
 		return -EINVAL;
 
+	if (sk->sk_net != &init_net)
+		return -EPROTONOSUPPORT;
+
 	rtnl_lock();
 
 	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
@@ -2133,6 +2166,9 @@ int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
 	if (!ipv4_is_multicast(addr))
 		return -EINVAL;
 
+	if (sk->sk_net != &init_net)
+		return -EPROTONOSUPPORT;
+
 	rtnl_lock();
 
 	err = -EADDRNOTAVAIL;
@@ -2217,6 +2253,9 @@ void ip_mc_drop_socket(struct sock *sk)
 	if (inet->mc_list == NULL)
 		return;
 
+	if (sk->sk_net != &init_net)
+		return;
+
 	rtnl_lock();
 	while ((iml = inet->mc_list) != NULL) {
 		struct in_device *in_dev;
-- 
1.5.3.rc5