[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;