[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, 172 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 6728772a943a..c2fe61becd61 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -152,177 +152,6 @@ int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
 
 EXPORT_SYMBOL_GPL(tcp_twsk_unique);
 
-/* called with local bh disabled */
-static int __tcp_v4_check_established(struct sock *sk, __u16 lport,
-                                      struct inet_timewait_sock **twp)
-{
-        struct inet_sock *inet = inet_sk(sk);
-        u32 daddr = inet->rcv_saddr;
-        u32 saddr = inet->daddr;
-        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(&tcp_hashinfo, hash);
-        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 + tcp_hashinfo.ehash_size)->chain) {
-                tw = inet_twsk(sk2);
-
-                if (INET_TW_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif)) {
-                        if (twsk_unique(sk, sk2, twp))
-                                goto unique;
-                        else
-                                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;
-        }
-
-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) {
-                *twp = tw;
-                NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
-        } else if (tw) {
-                /* Silly. Should hash-dance instead... */
-                inet_twsk_deschedule(tw, &tcp_death_row);
-                NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
-
-                inet_twsk_put(tw);
-        }
-
-        return 0;
-
-not_unique:
-        write_unlock(&head->lock);
-        return -EADDRNOTAVAIL;
-}
-
-static inline u32 connect_port_offset(const struct sock *sk)
-{
-        const struct inet_sock *inet = inet_sk(sk);
-
-        return secure_tcp_port_ephemeral(inet->rcv_saddr, inet->daddr, 
-                                         inet->dport);
-}
-
-/*
- * Bind a port for a connect operation and hash it.
- */
-static inline int tcp_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) {
-                int low = sysctl_local_port_range[0];
-                int high = sysctl_local_port_range[1];
-                int range = high - low;
-                int i;
-                int port;
-                static u32 hint;
-                u32 offset = hint + connect_port_offset(sk);
-                struct hlist_node *node;
-                struct inet_timewait_sock *tw = NULL;
-
-                local_bh_disable();
-                for (i = 1; i <= range; i++) {
-                        port = low + (i + offset) % range;
-                        head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_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 == port) {
-                                        BUG_TRAP(!hlist_empty(&tb->owners));
-                                        if (tb->fastreuse >= 0)
-                                                goto next_port;
-                                        if (!__tcp_v4_check_established(sk,
-                                                                        port,
-                                                                        &tw))
-                                                goto ok;
-                                        goto next_port;
-                                }
-                        }
-
-                        tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, port);
-                        if (!tb) {
-                                spin_unlock(&head->lock);
-                                break;
-                        }
-                        tb->fastreuse = -1;
-                        goto ok;
-
-                next_port:
-                        spin_unlock(&head->lock);
-                }
-                local_bh_enable();
-
-                return -EADDRNOTAVAIL;
-
-ok:
-                hint += i;
-
-                /* Head lock still held and bh's disabled */
-                inet_bind_hash(sk, tb, port);
-                if (sk_unhashed(sk)) {
-                        inet_sk(sk)->sport = htons(port);
-                        __inet_hash(&tcp_hashinfo, sk, 0);
-                }
-                spin_unlock(&head->lock);
-
-                if (tw) {
-                        inet_twsk_deschedule(tw, &tcp_death_row);;
-                        inet_twsk_put(tw);
-                }
-
-                ret = 0;
-                goto out;
-        }
-
-        head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_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) {
-                __inet_hash(&tcp_hashinfo, sk, 0);
-                spin_unlock_bh(&head->lock);
-                return 0;
-        } else {
-                spin_unlock(&head->lock);
-                /* No definite answer... Walk to established hash table */
-                ret = __tcp_v4_check_established(sk, snum, NULL);
-out:
-                local_bh_enable();
-                return ret;
-        }
-}
-
 /* This will initiate an outgoing connection. */
 int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 {
@@ -403,7 +232,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
          * complete initialization after this.
          */
         tcp_set_state(sk, TCP_SYN_SENT);
-        err = tcp_v4_hash_connect(sk);
+        err = inet_hash_connect(&tcp_death_row, sk);
         if (err)
                 goto failure;