[INET]: Generalise tcp_v4_hash_connect

Renaming it to inet_hash_connect, making it possible to ditch
dccp_v4_hash_connect and share the same code with TCP instead.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 159 deletions

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index e11cda0cb6b3..671fbf3b2379 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -54,164 +54,6 @@ void dccp_unhash(struct sock *sk)
 
 EXPORT_SYMBOL_GPL(dccp_unhash);
 
-/* called with local bh disabled */
-static int __dccp_v4_check_established(struct sock *sk, const __u16 lport,
-                                      struct inet_timewait_sock **twp)
-{
-        struct inet_sock *inet = inet_sk(sk);
-        const u32 daddr = inet->rcv_saddr;
-        const u32 saddr = inet->daddr;
-        const int dif = sk->sk_bound_dev_if;
-        INET_ADDR_COOKIE(acookie, saddr, daddr)
-        const __u32 ports = INET_COMBINED_PORTS(inet->dport, lport);
-        unsigned int hash = inet_ehashfn(daddr, lport, saddr, inet->dport);
-        struct inet_ehash_bucket *head = inet_ehash_bucket(&dccp_hashinfo, hash);
-        const struct sock *sk2;
-        const struct hlist_node *node;
-        struct inet_timewait_sock *tw;
-
-        prefetch(head->chain.first);
-        write_lock(&head->lock);
-
-        /* Check TIME-WAIT sockets first. */
-        sk_for_each(sk2, node, &(head + dccp_hashinfo.ehash_size)->chain) {
-                tw = inet_twsk(sk2);
-
-                if (INET_TW_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif))
-                        goto not_unique;
-        }
-        tw = NULL;
-
-        /* And established part... */
-        sk_for_each(sk2, node, &head->chain) {
-                if (INET_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif))
-                        goto not_unique;
-        }
-
-        /* Must record num and sport now. Otherwise we will see
-         * in hash table socket with a funny identity. */
-        inet->num = lport;
-        inet->sport = htons(lport);
-        sk->sk_hash = hash;
-        BUG_TRAP(sk_unhashed(sk));
-        __sk_add_node(sk, &head->chain);
-        sock_prot_inc_use(sk->sk_prot);
-        write_unlock(&head->lock);
-
-        if (twp != NULL) {
-                *twp = tw;
-                NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
-        } else if (tw != NULL) {
-                /* Silly. Should hash-dance instead... */
-                inet_twsk_deschedule(tw, &dccp_death_row);
-                NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
-
-                inet_twsk_put(tw);
-        }
-
-        return 0;
-
-not_unique:
-        write_unlock(&head->lock);
-        return -EADDRNOTAVAIL;
-}
-
-/*
- * Bind a port for a connect operation and hash it.
- */
-static int dccp_v4_hash_connect(struct sock *sk)
-{
-        const unsigned short snum = inet_sk(sk)->num;
-        struct inet_bind_hashbucket *head;
-        struct inet_bind_bucket *tb;
-        int ret;
-
-        if (snum == 0) {
-                int low = sysctl_local_port_range[0];
-                int high = sysctl_local_port_range[1];
-                int remaining = (high - low) + 1;
-                int rover = net_random() % (high - low) + low;
-                struct hlist_node *node;
-                struct inet_timewait_sock *tw = NULL;
-
-                local_bh_disable();
-                do {
-                        head = &dccp_hashinfo.bhash[inet_bhashfn(rover,
-                                                    dccp_hashinfo.bhash_size)];
-                        spin_lock(&head->lock);
-
-                        /* Does not bother with rcv_saddr checks,
-                         * because the established check is already
-                         * unique enough.
-                         */
-                        inet_bind_bucket_for_each(tb, node, &head->chain) {
-                                if (tb->port == rover) {
-                                        BUG_TRAP(!hlist_empty(&tb->owners));
-                                        if (tb->fastreuse >= 0)
-                                                goto next_port;
-                                        if (!__dccp_v4_check_established(sk,
-                                                                         rover,
-                                                                         &tw))
-                                                goto ok;
-                                        goto next_port;
-                                }
-                        }
-
-                        tb = inet_bind_bucket_create(dccp_hashinfo.bind_bucket_cachep,
-                                                     head, rover);
-                        if (tb == NULL) {
-                                spin_unlock(&head->lock);
-                                break;
-                        }
-                        tb->fastreuse = -1;
-                        goto ok;
-
-                next_port:
-                        spin_unlock(&head->lock);
-                        if (++rover > high)
-                                rover = low;
-                } while (--remaining > 0);
-
-                local_bh_enable();
-
-                return -EADDRNOTAVAIL;
-
-ok:
-                /* All locks still held and bhs disabled */
-                inet_bind_hash(sk, tb, rover);
-                if (sk_unhashed(sk)) {
-                        inet_sk(sk)->sport = htons(rover);
-                        __inet_hash(&dccp_hashinfo, sk, 0);
-                }
-                spin_unlock(&head->lock);
-
-                if (tw != NULL) {
-                        inet_twsk_deschedule(tw, &dccp_death_row);
-                        inet_twsk_put(tw);
-                }
-
-                ret = 0;
-                goto out;
-        }
-
-        head = &dccp_hashinfo.bhash[inet_bhashfn(snum,
-                                                 dccp_hashinfo.bhash_size)];
-        tb   = inet_csk(sk)->icsk_bind_hash;
-        spin_lock_bh(&head->lock);
-        if (sk_head(&tb->owners) == sk && sk->sk_bind_node.next == NULL) {
-                __inet_hash(&dccp_hashinfo, sk, 0);
-                spin_unlock_bh(&head->lock);
-                return 0;
-        } else {
-                spin_unlock(&head->lock);
-                /* No definite answer... Walk to established hash table */
-                ret = __dccp_v4_check_established(sk, snum, NULL);
-out:
-                local_bh_enable();
-                return ret;
-        }
-}
-
 int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 {
         struct inet_sock *inet = inet_sk(sk);
@@ -272,7 +114,7 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
          * complete initialization after this.
          */
         dccp_set_state(sk, DCCP_REQUESTING);
-        err = dccp_v4_hash_connect(sk);
+        err = inet_hash_connect(&dccp_death_row, sk);
         if (err != 0)
                 goto failure;