netns: Fix crash by making igmp per namespace

This patch makes the multicast socket to be per namespace.

When a network namespace is created, other than the init_net and a
multicast packet is received, the kernel goes to a hang or a kernel panic.

How to reproduce ?

 * create a child network namespace
 * create a pair virtual device veth
    * ip link add type veth
 * move one side to the pair network device to the child namespace
    * ip link set netns <childpid> dev veth1
 * ping -I veth0 224.0.0.1

The bug appears because the function ip_mc_init_dev does not initialize
the different multicast fields as it exits because it is not the init_net.

BUG: soft lockup - CPU#0 stuck for 61s! [avahi-daemon:2695]
Modules linked in:
irq event stamp: 50350
hardirqs last  enabled at (50349): [<c03ee949>] _spin_unlock_irqrestore+0x34/0x39
hardirqs last disabled at (50350): [<c03ec639>] schedule+0x9f/0x5ff
softirqs last  enabled at (45712): [<c0374d4b>] ip_setsockopt+0x8e7/0x909
softirqs last disabled at (45710): [<c03ee682>] _spin_lock_bh+0x8/0x27

Pid: 2695, comm: avahi-daemon Not tainted (2.6.27-rc2-00029-g0872073 #3)
EIP: 0060:[<c03ee47c>] EFLAGS: 00000297 CPU: 0
EIP is at __read_lock_failed+0x8/0x10
EAX: c4f38810 EBX: c4f38810 ECX: 00000000 EDX: c04cc22e
ESI: fb0000e0 EDI: 00000011 EBP: 0f02000a ESP: c4e3faa0
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
CR0: 8005003b CR2: 44618a40 CR3: 04e37000 CR4: 000006d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
 [<c02311f8>] ? _raw_read_lock+0x23/0x25
 [<c0390666>] ? ip_check_mc+0x1c/0x83
 [<c036d478>] ? ip_route_input+0x229/0xe92
 [<c022e2e4>] ? trace_hardirqs_on_thunk+0xc/0x10
 [<c0104c9c>] ? do_IRQ+0x69/0x7d
 [<c0102e64>] ? restore_nocheck_notrace+0x0/0xe
 [<c036fdba>] ? ip_rcv+0x227/0x505
 [<c0358764>] ? netif_receive_skb+0xfe/0x2b3
 [<c03588d2>] ? netif_receive_skb+0x26c/0x2b3
 [<c035af31>] ? process_backlog+0x73/0xbd
 [<c035a8cd>] ? net_rx_action+0xc1/0x1ae
 [<c01218a8>] ? __do_softirq+0x7b/0xef
 [<c0121953>] ? do_softirq+0x37/0x4d
 [<c035b50d>] ? dev_queue_xmit+0x3d4/0x40b
 [<c0122037>] ? local_bh_enable+0x96/0xab
 [<c035b50d>] ? dev_queue_xmit+0x3d4/0x40b
 [<c012181e>] ? _local_bh_enable+0x79/0x88
 [<c035fcb8>] ? neigh_resolve_output+0x20f/0x239
 [<c0373118>] ? ip_finish_output+0x1df/0x209
 [<c0373364>] ? ip_dev_loopback_xmit+0x62/0x66
 [<c0371db5>] ? ip_local_out+0x15/0x17
 [<c0372013>] ? ip_push_pending_frames+0x25c/0x2bb
 [<c03891b8>] ? udp_push_pending_frames+0x2bb/0x30e
 [<c038a189>] ? udp_sendmsg+0x413/0x51d
 [<c038a1a9>] ? udp_sendmsg+0x433/0x51d
 [<c038f927>] ? inet_sendmsg+0x35/0x3f
 [<c034f092>] ? sock_sendmsg+0xb8/0xd1
 [<c012d554>] ? autoremove_wake_function+0x0/0x2b
 [<c022e6de>] ? copy_from_user+0x32/0x5e
 [<c022e6de>] ? copy_from_user+0x32/0x5e
 [<c034f238>] ? sys_sendmsg+0x18d/0x1f0
 [<c0175e90>] ? pipe_write+0x3cb/0x3d7
 [<c0170347>] ? do_sync_write+0xbe/0x105
 [<c012d554>] ? autoremove_wake_function+0x0/0x2b
 [<c03503b2>] ? sys_socketcall+0x176/0x1b0
 [<c01085ea>] ? syscall_trace_enter+0x6c/0x7b
 [<c0102e1a>] ? syscall_call+0x7/0xb

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

1 files changed, 20 insertions, 51 deletions

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 6203ece53606..f70fac612596 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -289,6 +289,7 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
         struct rtable *rt;
         struct iphdr *pip;
         struct igmpv3_report *pig;
+        struct net *net = dev_net(dev);
 
         skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
         if (skb == NULL)
@@ -299,7 +300,7 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
                                     .nl_u = { .ip4_u = {
                                     .daddr = IGMPV3_ALL_MCR } },
                                     .proto = IPPROTO_IGMP };
-                if (ip_route_output_key(&init_net, &rt, &fl)) {
+                if (ip_route_output_key(net, &rt, &fl)) {
                         kfree_skb(skb);
                         return NULL;
                 }
@@ -629,6 +630,7 @@ static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
         struct igmphdr *ih;
         struct rtable *rt;
         struct net_device *dev = in_dev->dev;
+        struct net *net = dev_net(dev);
         __be32  group = pmc ? pmc->multiaddr : 0;
         __be32  dst;
 
@@ -643,7 +645,7 @@ static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
                 struct flowi fl = { .oif = dev->ifindex,
                                     .nl_u = { .ip4_u = { .daddr = dst } },
                                     .proto = IPPROTO_IGMP };
-                if (ip_route_output_key(&init_net, &rt, &fl))
+                if (ip_route_output_key(net, &rt, &fl))
                         return -1;
         }
         if (rt->rt_src == 0) {
@@ -1196,9 +1198,6 @@ void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
 
         ASSERT_RTNL();
 
-        if (!net_eq(dev_net(in_dev->dev), &init_net))
-                return;
-
         for (im=in_dev->mc_list; im; im=im->next) {
                 if (im->multiaddr == addr) {
                         im->users++;
@@ -1278,9 +1277,6 @@ void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
 
         ASSERT_RTNL();
 
-        if (!net_eq(dev_net(in_dev->dev), &init_net))
-                return;
-
         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
                 if (i->multiaddr==addr) {
                         if (--i->users == 0) {
@@ -1308,9 +1304,6 @@ void ip_mc_down(struct in_device *in_dev)
 
         ASSERT_RTNL();
 
-        if (!net_eq(dev_net(in_dev->dev), &init_net))
-                return;
-
         for (i=in_dev->mc_list; i; i=i->next)
                 igmp_group_dropped(i);
 
@@ -1331,9 +1324,6 @@ void ip_mc_init_dev(struct in_device *in_dev)
 {
         ASSERT_RTNL();
 
-        if (!net_eq(dev_net(in_dev->dev), &init_net))
-                return;
-
         in_dev->mc_tomb = NULL;
 #ifdef CONFIG_IP_MULTICAST
         in_dev->mr_gq_running = 0;
@@ -1357,9 +1347,6 @@ void ip_mc_up(struct in_device *in_dev)
 
         ASSERT_RTNL();
 
-        if (!net_eq(dev_net(in_dev->dev), &init_net))
-                return;
-
         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
 
         for (i=in_dev->mc_list; i; i=i->next)
@@ -1376,9 +1363,6 @@ void ip_mc_destroy_dev(struct in_device *in_dev)
 
         ASSERT_RTNL();
 
-        if (!net_eq(dev_net(in_dev->dev), &init_net))
-                return;
-
         /* Deactivate timers */
         ip_mc_down(in_dev);
 
@@ -1395,7 +1379,7 @@ void ip_mc_destroy_dev(struct in_device *in_dev)
         write_unlock_bh(&in_dev->mc_list_lock);
 }
 
-static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
+static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
 {
         struct flowi fl = { .nl_u = { .ip4_u =
                                       { .daddr = imr->imr_multiaddr.s_addr } } };
@@ -1404,19 +1388,19 @@ static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
         struct in_device *idev = NULL;
 
         if (imr->imr_ifindex) {
-                idev = inetdev_by_index(&init_net, imr->imr_ifindex);
+                idev = inetdev_by_index(net, imr->imr_ifindex);
                 if (idev)
                         __in_dev_put(idev);
                 return idev;
         }
         if (imr->imr_address.s_addr) {
-                dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
+                dev = ip_dev_find(net, imr->imr_address.s_addr);
                 if (!dev)
                         return NULL;
                 dev_put(dev);
         }
 
-        if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
+        if (!dev && !ip_route_output_key(net, &rt, &fl)) {
                 dev = rt->u.dst.dev;
                 ip_rt_put(rt);
         }
@@ -1754,18 +1738,16 @@ int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
         struct ip_mc_socklist *iml=NULL, *i;
         struct in_device *in_dev;
         struct inet_sock *inet = inet_sk(sk);
+        struct net *net = sock_net(sk);
         int ifindex;
         int count = 0;
 
         if (!ipv4_is_multicast(addr))
                 return -EINVAL;
 
-        if (!net_eq(sock_net(sk), &init_net))
-                return -EPROTONOSUPPORT;
-
         rtnl_lock();
 
-        in_dev = ip_mc_find_dev(imr);
+        in_dev = ip_mc_find_dev(net, imr);
 
         if (!in_dev) {
                 iml = NULL;
@@ -1827,15 +1809,13 @@ int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
         struct inet_sock *inet = inet_sk(sk);
         struct ip_mc_socklist *iml, **imlp;
         struct in_device *in_dev;
+        struct net *net = sock_net(sk);
         __be32 group = imr->imr_multiaddr.s_addr;
         u32 ifindex;
         int ret = -EADDRNOTAVAIL;
 
-        if (!net_eq(sock_net(sk), &init_net))
-                return -EPROTONOSUPPORT;
-
         rtnl_lock();
-        in_dev = ip_mc_find_dev(imr);
+        in_dev = ip_mc_find_dev(net, imr);
         ifindex = imr->imr_ifindex;
         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
                 if (iml->multi.imr_multiaddr.s_addr != group)
@@ -1873,21 +1853,19 @@ int ip_mc_source(int add, int omode, struct sock *sk, struct
         struct in_device *in_dev = NULL;
         struct inet_sock *inet = inet_sk(sk);
         struct ip_sf_socklist *psl;
+        struct net *net = sock_net(sk);
         int leavegroup = 0;
         int i, j, rv;
 
         if (!ipv4_is_multicast(addr))
                 return -EINVAL;
 
-        if (!net_eq(sock_net(sk), &init_net))
-                return -EPROTONOSUPPORT;
-
         rtnl_lock();
 
         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
         imr.imr_address.s_addr = mreqs->imr_interface;
         imr.imr_ifindex = ifindex;
-        in_dev = ip_mc_find_dev(&imr);
+        in_dev = ip_mc_find_dev(net, &imr);
 
         if (!in_dev) {
                 err = -ENODEV;
@@ -2007,6 +1985,7 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
         struct in_device *in_dev;
         struct inet_sock *inet = inet_sk(sk);
         struct ip_sf_socklist *newpsl, *psl;
+        struct net *net = sock_net(sk);
         int leavegroup = 0;
 
         if (!ipv4_is_multicast(addr))
@@ -2015,15 +1994,12 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
             msf->imsf_fmode != MCAST_EXCLUDE)
                 return -EINVAL;
 
-        if (!net_eq(sock_net(sk), &init_net))
-                return -EPROTONOSUPPORT;
-
         rtnl_lock();
 
         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
         imr.imr_address.s_addr = msf->imsf_interface;
         imr.imr_ifindex = ifindex;
-        in_dev = ip_mc_find_dev(&imr);
+        in_dev = ip_mc_find_dev(net, &imr);
 
         if (!in_dev) {
                 err = -ENODEV;
@@ -2094,19 +2070,17 @@ int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
         struct in_device *in_dev;
         struct inet_sock *inet = inet_sk(sk);
         struct ip_sf_socklist *psl;
+        struct net *net = sock_net(sk);
 
         if (!ipv4_is_multicast(addr))
                 return -EINVAL;
 
-        if (!net_eq(sock_net(sk), &init_net))
-                return -EPROTONOSUPPORT;
-
         rtnl_lock();
 
         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
         imr.imr_address.s_addr = msf->imsf_interface;
         imr.imr_ifindex = 0;
-        in_dev = ip_mc_find_dev(&imr);
+        in_dev = ip_mc_find_dev(net, &imr);
 
         if (!in_dev) {
                 err = -ENODEV;
@@ -2163,9 +2137,6 @@ int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
         if (!ipv4_is_multicast(addr))
                 return -EINVAL;
 
-        if (!net_eq(sock_net(sk), &init_net))
-                return -EPROTONOSUPPORT;
-
         rtnl_lock();
 
         err = -EADDRNOTAVAIL;
@@ -2246,19 +2217,17 @@ void ip_mc_drop_socket(struct sock *sk)
 {
         struct inet_sock *inet = inet_sk(sk);
         struct ip_mc_socklist *iml;
+        struct net *net = sock_net(sk);
 
         if (inet->mc_list == NULL)
                 return;
 
-        if (!net_eq(sock_net(sk), &init_net))
-                return;
-
         rtnl_lock();
         while ((iml = inet->mc_list) != NULL) {
                 struct in_device *in_dev;
                 inet->mc_list = iml->next;
 
-                in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
+                in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
                 (void) ip_mc_leave_src(sk, iml, in_dev);
                 if (in_dev != NULL) {
                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);