[NETNS]: Tcp-v4 sockets per-net lookup.

Add a net argument to inet_lookup and propagate it further
into lookup calls. Plus tune the __inet_check_established.

The dccp and inet_diag, which use that lookup functions
pass the init_net into them.

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

3 files changed, 28 insertions, 18 deletions

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 4cfb15c461f1..95c9f1429228 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -268,7 +268,7 @@ static int inet_diag_get_exact(struct sk_buff *in_skb,
         err = -EINVAL;
 
         if (req->idiag_family == AF_INET) {
-                sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
+                sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
                                  req->id.idiag_dport, req->id.idiag_src[0],
                                  req->id.idiag_sport, req->id.idiag_if);
         }
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index db1e53a865c2..48d45008f749 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -127,7 +127,8 @@ EXPORT_SYMBOL(inet_listen_wlock);
  * remote address for the connection. So always assume those are both
  * wildcarded during the search since they can never be otherwise.
  */
-static struct sock *inet_lookup_listener_slow(const struct hlist_head *head,
+static struct sock *inet_lookup_listener_slow(struct net *net,
+                                              const struct hlist_head *head,
                                               const __be32 daddr,
                                               const unsigned short hnum,
                                               const int dif)
@@ -139,7 +140,8 @@ static struct sock *inet_lookup_listener_slow(const struct hlist_head *head,
         sk_for_each(sk, node, head) {
                 const struct inet_sock *inet = inet_sk(sk);
 
-                if (inet->num == hnum && !ipv6_only_sock(sk)) {
+                if (sk->sk_net == net && inet->num == hnum &&
+                                !ipv6_only_sock(sk)) {
                         const __be32 rcv_saddr = inet->rcv_saddr;
                         int score = sk->sk_family == PF_INET ? 1 : 0;
 
@@ -165,7 +167,8 @@ static struct sock *inet_lookup_listener_slow(const struct hlist_head *head,
 }
 
 /* Optimize the common listener case. */
-struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
+struct sock *__inet_lookup_listener(struct net *net,
+                                    struct inet_hashinfo *hashinfo,
                                     const __be32 daddr, const unsigned short hnum,
                                     const int dif)
 {
@@ -180,9 +183,9 @@ struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
                 if (inet->num == hnum && !sk->sk_node.next &&
                     (!inet->rcv_saddr || inet->rcv_saddr == daddr) &&
                     (sk->sk_family == PF_INET || !ipv6_only_sock(sk)) &&
-                    !sk->sk_bound_dev_if)
+                    !sk->sk_bound_dev_if && sk->sk_net == net)
                         goto sherry_cache;
-                sk = inet_lookup_listener_slow(head, daddr, hnum, dif);
+                sk = inet_lookup_listener_slow(net, head, daddr, hnum, dif);
         }
         if (sk) {
 sherry_cache:
@@ -193,7 +196,8 @@ sherry_cache:
 }
 EXPORT_SYMBOL_GPL(__inet_lookup_listener);
 
-struct sock * __inet_lookup_established(struct inet_hashinfo *hashinfo,
+struct sock * __inet_lookup_established(struct net *net,
+                                  struct inet_hashinfo *hashinfo,
                                   const __be32 saddr, const __be16 sport,
                                   const __be32 daddr, const u16 hnum,
                                   const int dif)
@@ -212,13 +216,15 @@ struct sock * __inet_lookup_established(struct inet_hashinfo *hashinfo,
         prefetch(head->chain.first);
         read_lock(lock);
         sk_for_each(sk, node, &head->chain) {
-                if (INET_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
+                if (INET_MATCH(sk, net, hash, acookie,
+                                        saddr, daddr, ports, dif))
                         goto hit; /* You sunk my battleship! */
         }
 
         /* Must check for a TIME_WAIT'er before going to listener hash. */
         sk_for_each(sk, node, &head->twchain) {
-                if (INET_TW_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
+                if (INET_TW_MATCH(sk, net, hash, acookie,
+                                        saddr, daddr, ports, dif))
                         goto hit;
         }
         sk = NULL;
@@ -249,6 +255,7 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
         struct sock *sk2;
         const struct hlist_node *node;
         struct inet_timewait_sock *tw;
+        struct net *net = sk->sk_net;
 
         prefetch(head->chain.first);
         write_lock(lock);
@@ -257,7 +264,8 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
         sk_for_each(sk2, node, &head->twchain) {
                 tw = inet_twsk(sk2);
 
-                if (INET_TW_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif)) {
+                if (INET_TW_MATCH(sk2, net, hash, acookie,
+                                        saddr, daddr, ports, dif)) {
                         if (twsk_unique(sk, sk2, twp))
                                 goto unique;
                         else
@@ -268,7 +276,8 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
 
         /* And established part... */
         sk_for_each(sk2, node, &head->chain) {
-                if (INET_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif))
+                if (INET_MATCH(sk2, net, hash, acookie,
+                                        saddr, daddr, ports, dif))
                         goto not_unique;
         }
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 9aea88b8d4fc..77c1939a2b0d 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -369,8 +369,8 @@ void tcp_v4_err(struct sk_buff *skb, u32 info)
                 return;
         }
 
-        sk = inet_lookup(&tcp_hashinfo, iph->daddr, th->dest, iph->saddr,
-                         th->source, inet_iif(skb));
+        sk = inet_lookup(skb->dev->nd_net, &tcp_hashinfo, iph->daddr, th->dest,
+                        iph->saddr, th->source, inet_iif(skb));
         if (!sk) {
                 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
                 return;
@@ -1503,8 +1503,8 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
         if (req)
                 return tcp_check_req(sk, skb, req, prev);
 
-        nsk = inet_lookup_established(&tcp_hashinfo, iph->saddr, th->source,
-                                      iph->daddr, th->dest, inet_iif(skb));
+        nsk = inet_lookup_established(sk->sk_net, &tcp_hashinfo, iph->saddr,
+                        th->source, iph->daddr, th->dest, inet_iif(skb));
 
         if (nsk) {
                 if (nsk->sk_state != TCP_TIME_WAIT) {
@@ -1661,8 +1661,8 @@ int tcp_v4_rcv(struct sk_buff *skb)
         TCP_SKB_CB(skb)->flags   = iph->tos;
         TCP_SKB_CB(skb)->sacked  = 0;
 
-        sk = __inet_lookup(&tcp_hashinfo, iph->saddr, th->source,
-                           iph->daddr, th->dest, inet_iif(skb));
+        sk = __inet_lookup(skb->dev->nd_net, &tcp_hashinfo, iph->saddr,
+                        th->source, iph->daddr, th->dest, inet_iif(skb));
         if (!sk)
                 goto no_tcp_socket;
 
@@ -1735,7 +1735,8 @@ do_time_wait:
         }
         switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
         case TCP_TW_SYN: {
-                struct sock *sk2 = inet_lookup_listener(&tcp_hashinfo,
+                struct sock *sk2 = inet_lookup_listener(skb->dev->nd_net,
+                                                        &tcp_hashinfo,
                                                         iph->daddr, th->dest,
                                                         inet_iif(skb));
                 if (sk2) {