[NETNS]: Udp sockets per-net lookup.

Add the net parameter to udp_get_port family of calls and
udp_lookup one and use it to filter sockets.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 11 deletions

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 2fb8d731026b..7ea1b67b6de1 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -130,14 +130,14 @@ EXPORT_SYMBOL(sysctl_udp_wmem_min);
 atomic_t udp_memory_allocated;
 EXPORT_SYMBOL(udp_memory_allocated);
 
-static inline int __udp_lib_lport_inuse(__u16 num,
+static inline int __udp_lib_lport_inuse(struct net *net, __u16 num,
                                         const struct hlist_head udptable[])
 {
         struct sock *sk;
         struct hlist_node *node;
 
         sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)])
-                if (sk->sk_hash == num)
+                if (sk->sk_net == net && sk->sk_hash == num)
                         return 1;
         return 0;
 }
@@ -159,6 +159,7 @@ int __udp_lib_get_port(struct sock *sk, unsigned short snum,
         struct hlist_head *head;
         struct sock *sk2;
         int    error = 1;
+        struct net *net = sk->sk_net;
 
         write_lock_bh(&udp_hash_lock);
 
@@ -198,7 +199,7 @@ int __udp_lib_get_port(struct sock *sk, unsigned short snum,
                 /* 2nd pass: find hole in shortest hash chain */
                 rover = best;
                 for (i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++) {
-                        if (! __udp_lib_lport_inuse(rover, udptable))
+                        if (! __udp_lib_lport_inuse(net, rover, udptable))
                                 goto gotit;
                         rover += UDP_HTABLE_SIZE;
                         if (rover > high)
@@ -218,6 +219,7 @@ gotit:
                 sk_for_each(sk2, node, head)
                         if (sk2->sk_hash == snum                             &&
                             sk2 != sk                                        &&
+                            sk2->sk_net == net                               &&
                             (!sk2->sk_reuse        || !sk->sk_reuse)         &&
                             (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if
                              || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
@@ -261,9 +263,9 @@ static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
 /* UDP is nearly always wildcards out the wazoo, it makes no sense to try
  * harder than this. -DaveM
  */
-static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport,
-                                      __be32 daddr, __be16 dport,
-                                      int dif, struct hlist_head udptable[])
+static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
+                __be16 sport, __be32 daddr, __be16 dport,
+                int dif, struct hlist_head udptable[])
 {
         struct sock *sk, *result = NULL;
         struct hlist_node *node;
@@ -274,7 +276,8 @@ static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport,
         sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
                 struct inet_sock *inet = inet_sk(sk);
 
-                if (sk->sk_hash == hnum && !ipv6_only_sock(sk)) {
+                if (sk->sk_net == net && sk->sk_hash == hnum &&
+                                !ipv6_only_sock(sk)) {
                         int score = (sk->sk_family == PF_INET ? 1 : 0);
                         if (inet->rcv_saddr) {
                                 if (inet->rcv_saddr != daddr)
@@ -361,8 +364,8 @@ void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
         int harderr;
         int err;
 
-        sk = __udp4_lib_lookup(iph->daddr, uh->dest, iph->saddr, uh->source,
-                               skb->dev->ifindex, udptable                  );
+        sk = __udp4_lib_lookup(skb->dev->nd_net, iph->daddr, uh->dest,
+                        iph->saddr, uh->source, skb->dev->ifindex, udptable);
         if (sk == NULL) {
                 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
                 return; /* No socket for error */
@@ -1185,8 +1188,8 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
         if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
                 return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
 
-        sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
-                               inet_iif(skb), udptable);
+        sk = __udp4_lib_lookup(skb->dev->nd_net, saddr, uh->source, daddr,
+                        uh->dest, inet_iif(skb), udptable);
 
         if (sk != NULL) {
                 int ret = 0;