[net-next-2.6.git] / net / ipv4 / inet_connection_sock.c

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Support for INET connection oriented protocols.
 *
 * Authors:	See the TCP sources
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or(at your option) any later version.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/jhash.h>

#include <net/inet_connection_sock.h>
#include <net/inet_hashtables.h>
#include <net/inet_timewait_sock.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/tcp_states.h>

#ifdef INET_CSK_DEBUG
const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";
EXPORT_SYMBOL(inet_csk_timer_bug_msg);
#endif

/*
 * This array holds the first and last local port number.
 * For high-usage systems, use sysctl to change this to
 * 32768-61000
 */
int sysctl_local_port_range[2] = { 1024, 4999 };

static inline int inet_csk_bind_conflict(struct sock *sk, struct inet_bind_bucket *tb)
{
	const u32 sk_rcv_saddr = inet_rcv_saddr(sk);
	struct sock *sk2;
	struct hlist_node *node;
	int reuse = sk->sk_reuse;

	sk_for_each_bound(sk2, node, &tb->owners) {
		if (sk != sk2 &&
		    !inet_v6_ipv6only(sk2) &&
		    (!sk->sk_bound_dev_if ||
		     !sk2->sk_bound_dev_if ||
		     sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
			if (!reuse || !sk2->sk_reuse ||
			    sk2->sk_state == TCP_LISTEN) {
				const u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
				if (!sk2_rcv_saddr || !sk_rcv_saddr ||
				    sk2_rcv_saddr == sk_rcv_saddr)
					break;
			}
		}
	}
	return node != NULL;
}

/* Obtain a reference to a local port for the given sock,
 * if snum is zero it means select any available local port.
 */
int inet_csk_get_port(struct inet_hashinfo *hashinfo,
		      struct sock *sk, unsigned short snum)
{
	struct inet_bind_hashbucket *head;
	struct hlist_node *node;
	struct inet_bind_bucket *tb;
	int ret;

	local_bh_disable();
	if (!snum) {
		int low = sysctl_local_port_range[0];
		int high = sysctl_local_port_range[1];
		int remaining = (high - low) + 1;
		int rover;

		spin_lock(&hashinfo->portalloc_lock);
		if (hashinfo->port_rover < low)
			rover = low;
		else
			rover = hashinfo->port_rover;
		do {
			rover++;
			if (rover > high)
				rover = low;
			head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)];
			spin_lock(&head->lock);
			inet_bind_bucket_for_each(tb, node, &head->chain)
				if (tb->port == rover)
					goto next;
			break;
		next:
			spin_unlock(&head->lock);
		} while (--remaining > 0);
		hashinfo->port_rover = rover;
		spin_unlock(&hashinfo->portalloc_lock);

		/* Exhausted local port range during search?  It is not
		 * possible for us to be holding one of the bind hash
		 * locks if this test triggers, because if 'remaining'
		 * drops to zero, we broke out of the do/while loop at
		 * the top level, not from the 'break;' statement.
		 */
		ret = 1;
		if (remaining <= 0)
			goto fail;

		/* OK, here is the one we will use.  HEAD is
		 * non-NULL and we hold it's mutex.
		 */
		snum = rover;
	} else {
		head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)];
		spin_lock(&head->lock);
		inet_bind_bucket_for_each(tb, node, &head->chain)
			if (tb->port == snum)
				goto tb_found;
	}
	tb = NULL;
	goto tb_not_found;
tb_found:
	if (!hlist_empty(&tb->owners)) {
		if (sk->sk_reuse > 1)
			goto success;
		if (tb->fastreuse > 0 &&
		    sk->sk_reuse && sk->sk_state != TCP_LISTEN) {
			goto success;
		} else {
			ret = 1;
			if (inet_csk_bind_conflict(sk, tb))
				goto fail_unlock;
		}
	}
tb_not_found:
	ret = 1;
	if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL)
		goto fail_unlock;
	if (hlist_empty(&tb->owners)) {
		if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
			tb->fastreuse = 1;
		else
			tb->fastreuse = 0;
	} else if (tb->fastreuse &&
		   (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
		tb->fastreuse = 0;
success:
	if (!inet_csk(sk)->icsk_bind_hash)
		inet_bind_hash(sk, tb, snum);
	BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb);
 	ret = 0;

fail_unlock:
	spin_unlock(&head->lock);
fail:
	local_bh_enable();
	return ret;
}

EXPORT_SYMBOL_GPL(inet_csk_get_port);

/*
 * Wait for an incoming connection, avoid race conditions. This must be called
 * with the socket locked.
 */
static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	DEFINE_WAIT(wait);
	int err;

	/*
	 * True wake-one mechanism for incoming connections: only
	 * one process gets woken up, not the 'whole herd'.
	 * Since we do not 'race & poll' for established sockets
	 * anymore, the common case will execute the loop only once.
	 *
	 * Subtle issue: "add_wait_queue_exclusive()" will be added
	 * after any current non-exclusive waiters, and we know that
	 * it will always _stay_ after any new non-exclusive waiters
	 * because all non-exclusive waiters are added at the
	 * beginning of the wait-queue. As such, it's ok to "drop"
	 * our exclusiveness temporarily when we get woken up without
	 * having to remove and re-insert us on the wait queue.
	 */
	for (;;) {
		prepare_to_wait_exclusive(sk->sk_sleep, &wait,
					  TASK_INTERRUPTIBLE);
		release_sock(sk);
		if (reqsk_queue_empty(&icsk->icsk_accept_queue))
			timeo = schedule_timeout(timeo);
		lock_sock(sk);
		err = 0;
		if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
			break;
		err = -EINVAL;
		if (sk->sk_state != TCP_LISTEN)
			break;
		err = sock_intr_errno(timeo);
		if (signal_pending(current))
			break;
		err = -EAGAIN;
		if (!timeo)
			break;
	}
	finish_wait(sk->sk_sleep, &wait);
	return err;
}

/*
 * This will accept the next outstanding connection.
 */
struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct sock *newsk;
	int error;

	lock_sock(sk);

	/* We need to make sure that this socket is listening,
	 * and that it has something pending.
	 */
	error = -EINVAL;
	if (sk->sk_state != TCP_LISTEN)
		goto out_err;

	/* Find already established connection */
	if (reqsk_queue_empty(&icsk->icsk_accept_queue)) {
		long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);

		/* If this is a non blocking socket don't sleep */
		error = -EAGAIN;
		if (!timeo)
			goto out_err;

		error = inet_csk_wait_for_connect(sk, timeo);
		if (error)
			goto out_err;
	}

	newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk);
	BUG_TRAP(newsk->sk_state != TCP_SYN_RECV);
out:
	release_sock(sk);
	return newsk;
out_err:
	newsk = NULL;
	*err = error;
	goto out;
}

EXPORT_SYMBOL(inet_csk_accept);

/*
 * Using different timers for retransmit, delayed acks and probes
 * We may wish use just one timer maintaining a list of expire jiffies 
 * to optimize.
 */
void inet_csk_init_xmit_timers(struct sock *sk,
			       void (*retransmit_handler)(unsigned long),
			       void (*delack_handler)(unsigned long),
			       void (*keepalive_handler)(unsigned long))
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	init_timer(&icsk->icsk_retransmit_timer);
	init_timer(&icsk->icsk_delack_timer);
	init_timer(&sk->sk_timer);

	icsk->icsk_retransmit_timer.function = retransmit_handler;
	icsk->icsk_delack_timer.function     = delack_handler;
	sk->sk_timer.function		     = keepalive_handler;

	icsk->icsk_retransmit_timer.data = 
		icsk->icsk_delack_timer.data =
			sk->sk_timer.data  = (unsigned long)sk;

	icsk->icsk_pending = icsk->icsk_ack.pending = 0;
}

EXPORT_SYMBOL(inet_csk_init_xmit_timers);

void inet_csk_clear_xmit_timers(struct sock *sk)
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;

	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
	sk_stop_timer(sk, &icsk->icsk_delack_timer);
	sk_stop_timer(sk, &sk->sk_timer);
}

EXPORT_SYMBOL(inet_csk_clear_xmit_timers);

void inet_csk_delete_keepalive_timer(struct sock *sk)
{
	sk_stop_timer(sk, &sk->sk_timer);
}

EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);

void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
{
	sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
}

EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);

struct dst_entry* inet_csk_route_req(struct sock *sk,
				     const struct request_sock *req)
{
	struct rtable *rt;
	const struct inet_request_sock *ireq = inet_rsk(req);
	struct ip_options *opt = inet_rsk(req)->opt;
	struct flowi fl = { .oif = sk->sk_bound_dev_if,
			    .nl_u = { .ip4_u =
				      { .daddr = ((opt && opt->srr) ?
						  opt->faddr :
						  ireq->rmt_addr),
					.saddr = ireq->loc_addr,
					.tos = RT_CONN_FLAGS(sk) } },
			    .proto = sk->sk_protocol,
			    .uli_u = { .ports =
				       { .sport = inet_sk(sk)->sport,
					 .dport = ireq->rmt_port } } };

	if (ip_route_output_flow(&rt, &fl, sk, 0)) {
		IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
		return NULL;
	}
	if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) {
		ip_rt_put(rt);
		IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
		return NULL;
	}
	return &rt->u.dst;
}

EXPORT_SYMBOL_GPL(inet_csk_route_req);

static inline u32 inet_synq_hash(const u32 raddr, const u16 rport,
				 const u32 rnd, const u16 synq_hsize)
{
	return jhash_2words(raddr, (u32)rport, rnd) & (synq_hsize - 1);
}

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#define AF_INET_FAMILY(fam) ((fam) == AF_INET)
#else
#define AF_INET_FAMILY(fam) 1
#endif

struct request_sock *inet_csk_search_req(const struct sock *sk,
					 struct request_sock ***prevp,
					 const __u16 rport, const __u32 raddr,
					 const __u32 laddr)
{
	const struct inet_connection_sock *icsk = inet_csk(sk);
	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
	struct request_sock *req, **prev;

	for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd,
						    lopt->nr_table_entries)];
	     (req = *prev) != NULL;
	     prev = &req->dl_next) {
		const struct inet_request_sock *ireq = inet_rsk(req);

		if (ireq->rmt_port == rport &&
		    ireq->rmt_addr == raddr &&
		    ireq->loc_addr == laddr &&
		    AF_INET_FAMILY(req->rsk_ops->family)) {
			BUG_TRAP(!req->sk);
			*prevp = prev;
			break;
		}
	}

	return req;
}

EXPORT_SYMBOL_GPL(inet_csk_search_req);

void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
				   const unsigned timeout)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
	const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port,
				     lopt->hash_rnd, lopt->nr_table_entries);

	reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
	inet_csk_reqsk_queue_added(sk, timeout);
}

EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);

struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
			    const unsigned int __nocast priority)
{
	struct sock *newsk = sk_clone(sk, priority);

	if (newsk != NULL) {
		struct inet_connection_sock *newicsk = inet_csk(newsk);

		newsk->sk_state = TCP_SYN_RECV;
		newicsk->icsk_bind_hash = NULL;

		inet_sk(newsk)->dport = inet_rsk(req)->rmt_port;
		newsk->sk_write_space = sk_stream_write_space;

		newicsk->icsk_retransmits = 0;
		newicsk->icsk_backoff = 0;

		/* Deinitialize accept_queue to trap illegal accesses. */
		memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
	}
	return newsk;
}

EXPORT_SYMBOL_GPL(inet_csk_clone);
Commit	Line	Data
3f421baa ACM	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Support for INET connection oriented protocols.
	7	*
	8	* Authors: See the TCP sources
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or(at your option) any later version.
	14	*/
	15
	16	#include <linux/config.h>
	17	#include <linux/module.h>
	18	#include <linux/jhash.h>
	19
	20	#include <net/inet_connection_sock.h>
	21	#include <net/inet_hashtables.h>
	22	#include <net/inet_timewait_sock.h>
	23	#include <net/ip.h>
	24	#include <net/route.h>
	25	#include <net/tcp_states.h>
	26
	27	#ifdef INET_CSK_DEBUG
	28	const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";
	29	EXPORT_SYMBOL(inet_csk_timer_bug_msg);
	30	#endif
	31
	32	/*
	33	* This array holds the first and last local port number.
	34	* For high-usage systems, use sysctl to change this to
	35	* 32768-61000
	36	*/
	37	int sysctl_local_port_range[2] = { 1024, 4999 };
	38
	39	static inline int inet_csk_bind_conflict(struct sock sk, struct inet_bind_bucket tb)
	40	{
	41	const u32 sk_rcv_saddr = inet_rcv_saddr(sk);
	42	struct sock *sk2;
	43	struct hlist_node *node;
	44	int reuse = sk->sk_reuse;
	45
	46	sk_for_each_bound(sk2, node, &tb->owners) {
	47	if (sk != sk2 &&
	48	!inet_v6_ipv6only(sk2) &&
	49	(!sk->sk_bound_dev_if \|\|
	50	!sk2->sk_bound_dev_if \|\|
	51	sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
	52	if (!reuse \|\| !sk2->sk_reuse \|\|
	53	sk2->sk_state == TCP_LISTEN) {
	54	const u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
	55	if (!sk2_rcv_saddr \|\| !sk_rcv_saddr \|\|
	56	sk2_rcv_saddr == sk_rcv_saddr)
	57	break;
	58	}
	59	}
	60	}
	61	return node != NULL;
	62	}
	63
	64	/* Obtain a reference to a local port for the given sock,
65	* if snum is zero it means select any available local port.
66	*/
67	int inet_csk_get_port(struct inet_hashinfo *hashinfo,
68	struct sock *sk, unsigned short snum)
69	{
70	struct inet_bind_hashbucket *head;
71	struct hlist_node *node;
72	struct inet_bind_bucket *tb;
73	int ret;
74
75	local_bh_disable();
76	if (!snum) {
77	int low = sysctl_local_port_range[0];
78	int high = sysctl_local_port_range[1];
79	int remaining = (high - low) + 1;
80	int rover;
81
82	spin_lock(&hashinfo->portalloc_lock);
83	if (hashinfo->port_rover < low)
84	rover = low;
85	else
86	rover = hashinfo->port_rover;
87	do {
88	rover++;
89	if (rover > high)
90	rover = low;
91	head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)];
92	spin_lock(&head->lock);
93	inet_bind_bucket_for_each(tb, node, &head->chain)
94	if (tb->port == rover)
95	goto next;
96	break;
97	next:
98	spin_unlock(&head->lock);
99	} while (--remaining > 0);
100	hashinfo->port_rover = rover;
101	spin_unlock(&hashinfo->portalloc_lock);
102
103	/* Exhausted local port range during search? It is not
104	* possible for us to be holding one of the bind hash
105	* locks if this test triggers, because if 'remaining'
106	* drops to zero, we broke out of the do/while loop at
107	* the top level, not from the 'break;' statement.
108	*/
109	ret = 1;
110	if (remaining <= 0)
111	goto fail;
112
113	/* OK, here is the one we will use. HEAD is
114	* non-NULL and we hold it's mutex.
115	*/
116	snum = rover;
117	} else {
118	head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)];
119	spin_lock(&head->lock);
120	inet_bind_bucket_for_each(tb, node, &head->chain)
121	if (tb->port == snum)
122	goto tb_found;
123	}
124	tb = NULL;
125	goto tb_not_found;
126	tb_found:
127	if (!hlist_empty(&tb->owners)) {
128	if (sk->sk_reuse > 1)
129	goto success;
130	if (tb->fastreuse > 0 &&
131	sk->sk_reuse && sk->sk_state != TCP_LISTEN) {
132	goto success;
133	} else {
134	ret = 1;
135	if (inet_csk_bind_conflict(sk, tb))
136	goto fail_unlock;
137	}
138	}
139	tb_not_found:
140	ret = 1;
141	if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL)
142	goto fail_unlock;
143	if (hlist_empty(&tb->owners)) {
144	if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
145	tb->fastreuse = 1;
146	else
147	tb->fastreuse = 0;
148	} else if (tb->fastreuse &&
149	(!sk->sk_reuse \|\| sk->sk_state == TCP_LISTEN))
150	tb->fastreuse = 0;
151	success:
152	if (!inet_csk(sk)->icsk_bind_hash)
153	inet_bind_hash(sk, tb, snum);
154	BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb);
155	ret = 0;
156
157	fail_unlock:
158	spin_unlock(&head->lock);
159	fail:
160	local_bh_enable();
161	return ret;
162	}
163
164	EXPORT_SYMBOL_GPL(inet_csk_get_port);
165
166	/*
167	* Wait for an incoming connection, avoid race conditions. This must be called
168	* with the socket locked.
169	*/
170	static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
171	{
172	struct inet_connection_sock *icsk = inet_csk(sk);
173	DEFINE_WAIT(wait);
174	int err;
175
176	/*
177	* True wake-one mechanism for incoming connections: only
178	* one process gets woken up, not the 'whole herd'.
179	* Since we do not 'race & poll' for established sockets
180	* anymore, the common case will execute the loop only once.
181	*
182	* Subtle issue: "add_wait_queue_exclusive()" will be added
183	* after any current non-exclusive waiters, and we know that
184	* it will always _stay_ after any new non-exclusive waiters
185	* because all non-exclusive waiters are added at the
186	* beginning of the wait-queue. As such, it's ok to "drop"
187	* our exclusiveness temporarily when we get woken up without
188	* having to remove and re-insert us on the wait queue.
189	*/
190	for (;;) {
191	prepare_to_wait_exclusive(sk->sk_sleep, &wait,
192	TASK_INTERRUPTIBLE);
193	release_sock(sk);
194	if (reqsk_queue_empty(&icsk->icsk_accept_queue))
195	timeo = schedule_timeout(timeo);
196	lock_sock(sk);
197	err = 0;
198	if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
199	break;
200	err = -EINVAL;
201	if (sk->sk_state != TCP_LISTEN)
202	break;
203	err = sock_intr_errno(timeo);
204	if (signal_pending(current))
205	break;
206	err = -EAGAIN;
207	if (!timeo)
208	break;
209	}
210	finish_wait(sk->sk_sleep, &wait);
211	return err;
212	}
213
214	/*
215	* This will accept the next outstanding connection.
216	*/
217	struct sock inet_csk_accept(struct sock sk, int flags, int *err)
218	{
219	struct inet_connection_sock *icsk = inet_csk(sk);
220	struct sock *newsk;
221	int error;
222
223	lock_sock(sk);
224
225	/* We need to make sure that this socket is listening,
226	* and that it has something pending.
227	*/
228	error = -EINVAL;
229	if (sk->sk_state != TCP_LISTEN)
230	goto out_err;
231
232	/* Find already established connection */
233	if (reqsk_queue_empty(&icsk->icsk_accept_queue)) {
234	long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
235
236	/* If this is a non blocking socket don't sleep */
237	error = -EAGAIN;
238	if (!timeo)
239	goto out_err;
240
241	error = inet_csk_wait_for_connect(sk, timeo);
242	if (error)
243	goto out_err;
244	}
245
246	newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk);
247	BUG_TRAP(newsk->sk_state != TCP_SYN_RECV);
248	out:
249	release_sock(sk);
250	return newsk;
251	out_err:
252	newsk = NULL;
253	*err = error;
254	goto out;
255	}
256
257	EXPORT_SYMBOL(inet_csk_accept);
258
259	/*
260	* Using different timers for retransmit, delayed acks and probes
261	* We may wish use just one timer maintaining a list of expire jiffies
262	* to optimize.
263	*/
264	void inet_csk_init_xmit_timers(struct sock *sk,
265	void (*retransmit_handler)(unsigned long),
266	void (*delack_handler)(unsigned long),
267	void (*keepalive_handler)(unsigned long))
268	{
269	struct inet_connection_sock *icsk = inet_csk(sk);
270
271	init_timer(&icsk->icsk_retransmit_timer);
272	init_timer(&icsk->icsk_delack_timer);
273	init_timer(&sk->sk_timer);
274
275	icsk->icsk_retransmit_timer.function = retransmit_handler;
276	icsk->icsk_delack_timer.function = delack_handler;
277	sk->sk_timer.function = keepalive_handler;
278
279	icsk->icsk_retransmit_timer.data =
280	icsk->icsk_delack_timer.data =
281	sk->sk_timer.data = (unsigned long)sk;
282
283	icsk->icsk_pending = icsk->icsk_ack.pending = 0;
284	}
285
286	EXPORT_SYMBOL(inet_csk_init_xmit_timers);
287
288	void inet_csk_clear_xmit_timers(struct sock *sk)
289	{
290	struct inet_connection_sock *icsk = inet_csk(sk);
291
292	icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;
293
294	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
295	sk_stop_timer(sk, &icsk->icsk_delack_timer);
296	sk_stop_timer(sk, &sk->sk_timer);
297	}
298
299	EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
300
301	void inet_csk_delete_keepalive_timer(struct sock *sk)
302	{
303	sk_stop_timer(sk, &sk->sk_timer);
304	}
305
306	EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);
307
308	void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
309	{
310	sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
311	}
312
313	EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
314
315	struct dst_entry* inet_csk_route_req(struct sock *sk,
316	const struct request_sock *req)
317	{
318	struct rtable *rt;
319	const struct inet_request_sock *ireq = inet_rsk(req);
320	struct ip_options *opt = inet_rsk(req)->opt;
321	struct flowi fl = { .oif = sk->sk_bound_dev_if,
322	.nl_u = { .ip4_u =
323	{ .daddr = ((opt && opt->srr) ?
324	opt->faddr :
325	ireq->rmt_addr),
326	.saddr = ireq->loc_addr,
327	.tos = RT_CONN_FLAGS(sk) } },
328	.proto = sk->sk_protocol,
329	.uli_u = { .ports =
330	{ .sport = inet_sk(sk)->sport,
331	.dport = ireq->rmt_port } } };
332
333	if (ip_route_output_flow(&rt, &fl, sk, 0)) {
334	IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
335	return NULL;
336	}
337	if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) {
338	ip_rt_put(rt);
339	IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
340	return NULL;
341	}
342	return &rt->u.dst;
343	}
344
345	EXPORT_SYMBOL_GPL(inet_csk_route_req);
346
347	static inline u32 inet_synq_hash(const u32 raddr, const u16 rport,
348	const u32 rnd, const u16 synq_hsize)
349	{
350	return jhash_2words(raddr, (u32)rport, rnd) & (synq_hsize - 1);
351	}
352
353	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
354	#define AF_INET_FAMILY(fam) ((fam) == AF_INET)
355	#else
356	#define AF_INET_FAMILY(fam) 1
357	#endif
358
359	struct request_sock inet_csk_search_req(const struct sock sk,
360	struct request_sock ***prevp,
361	const __u16 rport, const __u32 raddr,
362	const __u32 laddr)
363	{
364	const struct inet_connection_sock *icsk = inet_csk(sk);
365	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
366	struct request_sock req, *prev;
367
368	for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd,
369	lopt->nr_table_entries)];
370	(req = *prev) != NULL;
371	prev = &req->dl_next) {
372	const struct inet_request_sock *ireq = inet_rsk(req);
373
374	if (ireq->rmt_port == rport &&
375	ireq->rmt_addr == raddr &&
376	ireq->loc_addr == laddr &&
377	AF_INET_FAMILY(req->rsk_ops->family)) {
378	BUG_TRAP(!req->sk);
379	*prevp = prev;
380	break;
381	}
382	}
383
384	return req;
385	}
386
387	EXPORT_SYMBOL_GPL(inet_csk_search_req);
388
389	void inet_csk_reqsk_queue_hash_add(struct sock sk, struct request_sock req,
390	const unsigned timeout)
391	{
392	struct inet_connection_sock *icsk = inet_csk(sk);
393	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
394	const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port,
395	lopt->hash_rnd, lopt->nr_table_entries);
396
397	reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
398	inet_csk_reqsk_queue_added(sk, timeout);
399	}
400
401	EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
9f1d2604 ACM	402
	403	struct sock inet_csk_clone(struct sock sk, const struct request_sock *req,
	404	const unsigned int __nocast priority)
	405	{
	406	struct sock *newsk = sk_clone(sk, priority);
	407
	408	if (newsk != NULL) {
	409	struct inet_connection_sock *newicsk = inet_csk(newsk);
	410
	411	newsk->sk_state = TCP_SYN_RECV;
	412	newicsk->icsk_bind_hash = NULL;
	413
	414	inet_sk(newsk)->dport = inet_rsk(req)->rmt_port;
	415	newsk->sk_write_space = sk_stream_write_space;
	416
	417	newicsk->icsk_retransmits = 0;
	418	newicsk->icsk_backoff = 0;
	419
	420	/* Deinitialize accept_queue to trap illegal accesses. */
	421	memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
	422	}
	423	return newsk;
	424	}
	425
	426	EXPORT_SYMBOL_GPL(inet_csk_clone);