udp: multicast packets need to check namespace

Current UDP multicast delivery is not namespace aware.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 5 deletions

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 2095abc3caba..cf02701ced48 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -284,7 +284,7 @@ struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
 }
 EXPORT_SYMBOL_GPL(udp4_lib_lookup);
 
-static inline struct sock *udp_v4_mcast_next(struct sock *sk,
+static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk,
                                              __be16 loc_port, __be32 loc_addr,
                                              __be16 rmt_port, __be32 rmt_addr,
                                              int dif)
@@ -296,7 +296,8 @@ static inline struct sock *udp_v4_mcast_next(struct sock *sk,
         sk_for_each_from(s, node) {
                 struct inet_sock *inet = inet_sk(s);
 
-                if (s->sk_hash != hnum                                  ||
+                if (!net_eq(sock_net(s), net)                           ||
+                    s->sk_hash != hnum                                  ||
                     (inet->daddr && inet->daddr != rmt_addr)            ||
                     (inet->dport != rmt_port && inet->dport)            ||
                     (inet->rcv_saddr && inet->rcv_saddr != loc_addr)    ||
@@ -1079,15 +1080,16 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
         read_lock(&udp_hash_lock);
         sk = sk_head(&udptable[udp_hashfn(net, ntohs(uh->dest))]);
         dif = skb->dev->ifindex;
-        sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
+        sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
         if (sk) {
                 struct sock *sknext = NULL;
 
                 do {
                         struct sk_buff *skb1 = skb;
 
-                        sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
-                                                   uh->source, saddr, dif);
+                        sknext = udp_v4_mcast_next(net, sk_next(sk), uh->dest,
+                                                   daddr, uh->source, saddr,
+                                                   dif);
                         if (sknext)
                                 skb1 = skb_clone(skb, GFP_ATOMIC);