[linux-2.6-block.git] / net / rxrpc / conn_object.c

/* RxRPC virtual connection handler, common bits.
 *
 * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include "ar-internal.h"

/*
 * Time till a connection expires after last use (in seconds).
 */
unsigned int __read_mostly rxrpc_connection_expiry = 10 * 60;
unsigned int __read_mostly rxrpc_closed_conn_expiry = 10;

static void rxrpc_destroy_connection(struct rcu_head *);

static void rxrpc_connection_timer(struct timer_list *timer)
{
	struct rxrpc_connection *conn =
		container_of(timer, struct rxrpc_connection, timer);

	rxrpc_queue_conn(conn);
}

/*
 * allocate a new connection
 */
struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
{
	struct rxrpc_connection *conn;

	_enter("");

	conn = kzalloc(sizeof(struct rxrpc_connection), gfp);
	if (conn) {
		INIT_LIST_HEAD(&conn->cache_link);
		spin_lock_init(&conn->channel_lock);
		INIT_LIST_HEAD(&conn->waiting_calls);
		timer_setup(&conn->timer, &rxrpc_connection_timer, 0);
		INIT_WORK(&conn->processor, &rxrpc_process_connection);
		INIT_LIST_HEAD(&conn->proc_link);
		INIT_LIST_HEAD(&conn->link);
		skb_queue_head_init(&conn->rx_queue);
		conn->security = &rxrpc_no_security;
		spin_lock_init(&conn->state_lock);
		conn->debug_id = atomic_inc_return(&rxrpc_debug_id);
		conn->size_align = 4;
		conn->idle_timestamp = jiffies;
	}

	_leave(" = %p{%d}", conn, conn ? conn->debug_id : 0);
	return conn;
}

/*
 * Look up a connection in the cache by protocol parameters.
 *
 * If successful, a pointer to the connection is returned, but no ref is taken.
 * NULL is returned if there is no match.
 *
 * When searching for a service call, if we find a peer but no connection, we
 * return that through *_peer in case we need to create a new service call.
 *
 * The caller must be holding the RCU read lock.
 */
struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local,
						   struct sk_buff *skb,
						   struct rxrpc_peer **_peer)
{
	struct rxrpc_connection *conn;
	struct rxrpc_conn_proto k;
	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
	struct sockaddr_rxrpc srx;
	struct rxrpc_peer *peer;

	_enter(",%x", sp->hdr.cid & RXRPC_CIDMASK);

	if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
		goto not_found;

	if (srx.transport.family != local->srx.transport.family &&
	    (srx.transport.family == AF_INET &&
	     local->srx.transport.family != AF_INET6)) {
		pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n",
				    srx.transport.family,
				    local->srx.transport.family);
		goto not_found;
	}

	k.epoch	= sp->hdr.epoch;
	k.cid	= sp->hdr.cid & RXRPC_CIDMASK;

	if (rxrpc_to_server(sp)) {
		/* We need to look up service connections by the full protocol
		 * parameter set.  We look up the peer first as an intermediate
		 * step and then the connection from the peer's tree.
		 */
		peer = rxrpc_lookup_peer_rcu(local, &srx);
		if (!peer)
			goto not_found;
		*_peer = peer;
		conn = rxrpc_find_service_conn_rcu(peer, skb);
		if (!conn || atomic_read(&conn->usage) == 0)
			goto not_found;
		_leave(" = %p", conn);
		return conn;
	} else {
		/* Look up client connections by connection ID alone as their
		 * IDs are unique for this machine.
		 */
		conn = idr_find(&rxrpc_client_conn_ids,
				sp->hdr.cid >> RXRPC_CIDSHIFT);
		if (!conn || atomic_read(&conn->usage) == 0) {
			_debug("no conn");
			goto not_found;
		}

		if (conn->proto.epoch != k.epoch ||
		    conn->params.local != local)
			goto not_found;

		peer = conn->params.peer;
		switch (srx.transport.family) {
		case AF_INET:
			if (peer->srx.transport.sin.sin_port !=
			    srx.transport.sin.sin_port ||
			    peer->srx.transport.sin.sin_addr.s_addr !=
			    srx.transport.sin.sin_addr.s_addr)
				goto not_found;
			break;
#ifdef CONFIG_AF_RXRPC_IPV6
		case AF_INET6:
			if (peer->srx.transport.sin6.sin6_port !=
			    srx.transport.sin6.sin6_port ||
			    memcmp(&peer->srx.transport.sin6.sin6_addr,
				   &srx.transport.sin6.sin6_addr,
				   sizeof(struct in6_addr)) != 0)
				goto not_found;
			break;
#endif
		default:
			BUG();
		}

		_leave(" = %p", conn);
		return conn;
	}

not_found:
	_leave(" = NULL");
	return NULL;
}

/*
 * Disconnect a call and clear any channel it occupies when that call
 * terminates.  The caller must hold the channel_lock and must release the
 * call's ref on the connection.
 */
void __rxrpc_disconnect_call(struct rxrpc_connection *conn,
			     struct rxrpc_call *call)
{
	struct rxrpc_channel *chan =
		&conn->channels[call->cid & RXRPC_CHANNELMASK];

	_enter("%d,%x", conn->debug_id, call->cid);

	if (rcu_access_pointer(chan->call) == call) {
		/* Save the result of the call so that we can repeat it if necessary
		 * through the channel, whilst disposing of the actual call record.
		 */
		trace_rxrpc_disconnect_call(call);
		switch (call->completion) {
		case RXRPC_CALL_SUCCEEDED:
			chan->last_seq = call->rx_hard_ack;
			chan->last_type = RXRPC_PACKET_TYPE_ACK;
			break;
		case RXRPC_CALL_LOCALLY_ABORTED:
			chan->last_abort = call->abort_code;
			chan->last_type = RXRPC_PACKET_TYPE_ABORT;
			break;
		default:
			chan->last_abort = RX_USER_ABORT;
			chan->last_type = RXRPC_PACKET_TYPE_ABORT;
			break;
		}

		/* Sync with rxrpc_conn_retransmit(). */
		smp_wmb();
		chan->last_call = chan->call_id;
		chan->call_id = chan->call_counter;

		rcu_assign_pointer(chan->call, NULL);
	}

	_leave("");
}

/*
 * Disconnect a call and clear any channel it occupies when that call
 * terminates.
 */
void rxrpc_disconnect_call(struct rxrpc_call *call)
{
	struct rxrpc_connection *conn = call->conn;

	call->peer->cong_cwnd = call->cong_cwnd;

	spin_lock_bh(&conn->params.peer->lock);
	hlist_del_rcu(&call->error_link);
	spin_unlock_bh(&conn->params.peer->lock);

	if (rxrpc_is_client_call(call))
		return rxrpc_disconnect_client_call(call);

	spin_lock(&conn->channel_lock);
	__rxrpc_disconnect_call(conn, call);
	spin_unlock(&conn->channel_lock);

	call->conn = NULL;
	conn->idle_timestamp = jiffies;
	rxrpc_put_connection(conn);
}

/*
 * Kill off a connection.
 */
void rxrpc_kill_connection(struct rxrpc_connection *conn)
{
	struct rxrpc_net *rxnet = conn->params.local->rxnet;

	ASSERT(!rcu_access_pointer(conn->channels[0].call) &&
	       !rcu_access_pointer(conn->channels[1].call) &&
	       !rcu_access_pointer(conn->channels[2].call) &&
	       !rcu_access_pointer(conn->channels[3].call));
	ASSERT(list_empty(&conn->cache_link));

	write_lock(&rxnet->conn_lock);
	list_del_init(&conn->proc_link);
	write_unlock(&rxnet->conn_lock);

	/* Drain the Rx queue.  Note that even though we've unpublished, an
	 * incoming packet could still be being added to our Rx queue, so we
	 * will need to drain it again in the RCU cleanup handler.
	 */
	rxrpc_purge_queue(&conn->rx_queue);

	/* Leave final destruction to RCU.  The connection processor work item
	 * must carry a ref on the connection to prevent us getting here whilst
	 * it is queued or running.
	 */
	call_rcu(&conn->rcu, rxrpc_destroy_connection);
}

/*
 * Queue a connection's work processor, getting a ref to pass to the work
 * queue.
 */
bool rxrpc_queue_conn(struct rxrpc_connection *conn)
{
	const void *here = __builtin_return_address(0);
	int n = atomic_fetch_add_unless(&conn->usage, 1, 0);
	if (n == 0)
		return false;
	if (rxrpc_queue_work(&conn->processor))
		trace_rxrpc_conn(conn, rxrpc_conn_queued, n + 1, here);
	else
		rxrpc_put_connection(conn);
	return true;
}

/*
 * Note the re-emergence of a connection.
 */
void rxrpc_see_connection(struct rxrpc_connection *conn)
{
	const void *here = __builtin_return_address(0);
	if (conn) {
		int n = atomic_read(&conn->usage);

		trace_rxrpc_conn(conn, rxrpc_conn_seen, n, here);
	}
}

/*
 * Get a ref on a connection.
 */
void rxrpc_get_connection(struct rxrpc_connection *conn)
{
	const void *here = __builtin_return_address(0);
	int n = atomic_inc_return(&conn->usage);

	trace_rxrpc_conn(conn, rxrpc_conn_got, n, here);
}

/*
 * Try to get a ref on a connection.
 */
struct rxrpc_connection *
rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
{
	const void *here = __builtin_return_address(0);

	if (conn) {
		int n = atomic_fetch_add_unless(&conn->usage, 1, 0);
		if (n > 0)
			trace_rxrpc_conn(conn, rxrpc_conn_got, n + 1, here);
		else
			conn = NULL;
	}
	return conn;
}

/*
 * Set the service connection reap timer.
 */
static void rxrpc_set_service_reap_timer(struct rxrpc_net *rxnet,
					 unsigned long reap_at)
{
	if (rxnet->live)
		timer_reduce(&rxnet->service_conn_reap_timer, reap_at);
}

/*
 * Release a service connection
 */
void rxrpc_put_service_conn(struct rxrpc_connection *conn)
{
	const void *here = __builtin_return_address(0);
	int n;

	n = atomic_dec_return(&conn->usage);
	trace_rxrpc_conn(conn, rxrpc_conn_put_service, n, here);
	ASSERTCMP(n, >=, 0);
	if (n == 1)
		rxrpc_set_service_reap_timer(conn->params.local->rxnet,
					     jiffies + rxrpc_connection_expiry);
}

/*
 * destroy a virtual connection
 */
static void rxrpc_destroy_connection(struct rcu_head *rcu)
{
	struct rxrpc_connection *conn =
		container_of(rcu, struct rxrpc_connection, rcu);

	_enter("{%d,u=%d}", conn->debug_id, atomic_read(&conn->usage));

	ASSERTCMP(atomic_read(&conn->usage), ==, 0);

	_net("DESTROY CONN %d", conn->debug_id);

	del_timer_sync(&conn->timer);
	rxrpc_purge_queue(&conn->rx_queue);

	conn->security->clear(conn);
	key_put(conn->params.key);
	key_put(conn->server_key);
	rxrpc_put_peer(conn->params.peer);

	if (atomic_dec_and_test(&conn->params.local->rxnet->nr_conns))
		wake_up_var(&conn->params.local->rxnet->nr_conns);
	rxrpc_put_local(conn->params.local);

	kfree(conn);
	_leave("");
}

/*
 * reap dead service connections
 */
void rxrpc_service_connection_reaper(struct work_struct *work)
{
	struct rxrpc_connection *conn, *_p;
	struct rxrpc_net *rxnet =
		container_of(work, struct rxrpc_net, service_conn_reaper);
	unsigned long expire_at, earliest, idle_timestamp, now;

	LIST_HEAD(graveyard);

	_enter("");

	now = jiffies;
	earliest = now + MAX_JIFFY_OFFSET;

	write_lock(&rxnet->conn_lock);
	list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
		ASSERTCMP(atomic_read(&conn->usage), >, 0);
		if (likely(atomic_read(&conn->usage) > 1))
			continue;
		if (conn->state == RXRPC_CONN_SERVICE_PREALLOC)
			continue;

		if (rxnet->live) {
			idle_timestamp = READ_ONCE(conn->idle_timestamp);
			expire_at = idle_timestamp + rxrpc_connection_expiry * HZ;
			if (conn->params.local->service_closed)
				expire_at = idle_timestamp + rxrpc_closed_conn_expiry * HZ;

			_debug("reap CONN %d { u=%d,t=%ld }",
			       conn->debug_id, atomic_read(&conn->usage),
			       (long)expire_at - (long)now);

			if (time_before(now, expire_at)) {
				if (time_before(expire_at, earliest))
					earliest = expire_at;
				continue;
			}
		}

		/* The usage count sits at 1 whilst the object is unused on the
		 * list; we reduce that to 0 to make the object unavailable.
		 */
		if (atomic_cmpxchg(&conn->usage, 1, 0) != 1)
			continue;
		trace_rxrpc_conn(conn, rxrpc_conn_reap_service, 0, NULL);

		if (rxrpc_conn_is_client(conn))
			BUG();
		else
			rxrpc_unpublish_service_conn(conn);

		list_move_tail(&conn->link, &graveyard);
	}
	write_unlock(&rxnet->conn_lock);

	if (earliest != now + MAX_JIFFY_OFFSET) {
		_debug("reschedule reaper %ld", (long)earliest - (long)now);
		ASSERT(time_after(earliest, now));
		rxrpc_set_service_reap_timer(rxnet, earliest);
	}

	while (!list_empty(&graveyard)) {
		conn = list_entry(graveyard.next, struct rxrpc_connection,
				  link);
		list_del_init(&conn->link);

		ASSERTCMP(atomic_read(&conn->usage), ==, 0);
		rxrpc_kill_connection(conn);
	}

	_leave("");
}

/*
 * preemptively destroy all the service connection records rather than
 * waiting for them to time out
 */
void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
{
	struct rxrpc_connection *conn, *_p;
	bool leak = false;

	_enter("");

	atomic_dec(&rxnet->nr_conns);
	rxrpc_destroy_all_client_connections(rxnet);

	del_timer_sync(&rxnet->service_conn_reap_timer);
	rxrpc_queue_work(&rxnet->service_conn_reaper);
	flush_workqueue(rxrpc_workqueue);

	write_lock(&rxnet->conn_lock);
	list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
		pr_err("AF_RXRPC: Leaked conn %p {%d}\n",
		       conn, atomic_read(&conn->usage));
		leak = true;
	}
	write_unlock(&rxnet->conn_lock);
	BUG_ON(leak);

	ASSERT(list_empty(&rxnet->conn_proc_list));

	/* We need to wait for the connections to be destroyed by RCU as they
	 * pin things that we still need to get rid of.
	 */
	wait_var_event(&rxnet->nr_conns, !atomic_read(&rxnet->nr_conns));
	_leave("");
}
Commit	Line	Data
45025bce	1	/* RxRPC virtual connection handler, common bits.
17926a79	2	*
45025bce	3	* Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
17926a79 DH	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
9b6d5398 JP	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9b6d5398 JP	13
17926a79	14	#include <linux/module.h>
5a0e3ad6	15	#include <linux/slab.h>
17926a79 DH	16	#include <linux/net.h>
17926a79 DH	17	#include <linux/skbuff.h>
17926a79 DH	18	#include "ar-internal.h"
17926a79 DH	19
5873c083 DH	20	/*
	21	* Time till a connection expires after last use (in seconds).
	22	*/
f859ab61 DH	23	unsigned int __read_mostly rxrpc_connection_expiry = 10 * 60;
f859ab61 DH	24	unsigned int __read_mostly rxrpc_closed_conn_expiry = 10;
5873c083	25
45025bce DH	26	static void rxrpc_destroy_connection(struct rcu_head *);
45025bce DH	27
3136ef49 DH	28	static void rxrpc_connection_timer(struct timer_list *timer)
	29	{
	30	struct rxrpc_connection *conn =
	31	container_of(timer, struct rxrpc_connection, timer);
	32
	33	rxrpc_queue_conn(conn);
	34	}
	35
17926a79 DH	36	/*
	37	* allocate a new connection
	38	*/
c6d2b8d7	39	struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
17926a79 DH	40	{
	41	struct rxrpc_connection *conn;
	42
	43	_enter("");
	44
	45	conn = kzalloc(sizeof(struct rxrpc_connection), gfp);
	46	if (conn) {
45025bce	47	INIT_LIST_HEAD(&conn->cache_link);
999b69f8	48	spin_lock_init(&conn->channel_lock);
45025bce	49	INIT_LIST_HEAD(&conn->waiting_calls);
3136ef49	50	timer_setup(&conn->timer, &rxrpc_connection_timer, 0);
17926a79	51	INIT_WORK(&conn->processor, &rxrpc_process_connection);
4d028b2c	52	INIT_LIST_HEAD(&conn->proc_link);
999b69f8	53	INIT_LIST_HEAD(&conn->link);
17926a79	54	skb_queue_head_init(&conn->rx_queue);
e0e4d82f	55	conn->security = &rxrpc_no_security;
17926a79	56	spin_lock_init(&conn->state_lock);
17926a79	57	conn->debug_id = atomic_inc_return(&rxrpc_debug_id);
17926a79	58	conn->size_align = 4;
f51b4480	59	conn->idle_timestamp = jiffies;
17926a79 DH	60	}
17926a79 DH	61
16c61add	62	_leave(" = %p{%d}", conn, conn ? conn->debug_id : 0);
17926a79 DH	63	return conn;
	64	}
	65
17926a79	66	/*
8496af50 DH	67	* Look up a connection in the cache by protocol parameters.
	68	*
	69	* If successful, a pointer to the connection is returned, but no ref is taken.
	70	* NULL is returned if there is no match.
	71	*
0099dc58 DH	72	* When searching for a service call, if we find a peer but no connection, we
	73	* return that through *_peer in case we need to create a new service call.
	74	*
8496af50	75	* The caller must be holding the RCU read lock.
17926a79	76	*/
8496af50	77	struct rxrpc_connection rxrpc_find_connection_rcu(struct rxrpc_local local,
0099dc58 DH	78	struct sk_buff *skb,
0099dc58 DH	79	struct rxrpc_peer **_peer)
17926a79 DH	80	{
17926a79 DH	81	struct rxrpc_connection *conn;
1291e9d1	82	struct rxrpc_conn_proto k;
42886ffe	83	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1291e9d1 DH	84	struct sockaddr_rxrpc srx;
1291e9d1 DH	85	struct rxrpc_peer *peer;
17926a79	86
8496af50	87	_enter(",%x", sp->hdr.cid & RXRPC_CIDMASK);
17926a79	88
5a790b73	89	if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
1291e9d1	90	goto not_found;
17926a79	91
46894a13 DH	92	if (srx.transport.family != local->srx.transport.family &&
	93	(srx.transport.family == AF_INET &&
	94	local->srx.transport.family != AF_INET6)) {
1291e9d1 DH	95	pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n",
	96	srx.transport.family,
	97	local->srx.transport.family);
	98	goto not_found;
	99	}
	100
	101	k.epoch = sp->hdr.epoch;
	102	k.cid = sp->hdr.cid & RXRPC_CIDMASK;
17926a79	103
dc71db34	104	if (rxrpc_to_server(sp)) {
1291e9d1 DH	105	/* We need to look up service connections by the full protocol
	106	* parameter set. We look up the peer first as an intermediate
	107	* step and then the connection from the peer's tree.
	108	*/
	109	peer = rxrpc_lookup_peer_rcu(local, &srx);
	110	if (!peer)
	111	goto not_found;
0099dc58	112	*_peer = peer;
8496af50 DH	113	conn = rxrpc_find_service_conn_rcu(peer, skb);
	114	if (!conn \|\| atomic_read(&conn->usage) == 0)
	115	goto not_found;
	116	_leave(" = %p", conn);
	117	return conn;
4a3388c8	118	} else {
8496af50 DH	119	/* Look up client connections by connection ID alone as their
	120	* IDs are unique for this machine.
	121	*/
1291e9d1	122	conn = idr_find(&rxrpc_client_conn_ids,
8496af50 DH	123	sp->hdr.cid >> RXRPC_CIDSHIFT);
	124	if (!conn \|\| atomic_read(&conn->usage) == 0) {
	125	_debug("no conn");
	126	goto not_found;
	127	}
	128
	129	if (conn->proto.epoch != k.epoch \|\|
1291e9d1 DH	130	conn->params.local != local)
	131	goto not_found;
	132
	133	peer = conn->params.peer;
	134	switch (srx.transport.family) {
	135	case AF_INET:
	136	if (peer->srx.transport.sin.sin_port !=
	137	srx.transport.sin.sin_port \|\|
	138	peer->srx.transport.sin.sin_addr.s_addr !=
	139	srx.transport.sin.sin_addr.s_addr)
	140	goto not_found;
	141	break;
d1912747	142	#ifdef CONFIG_AF_RXRPC_IPV6
75b54cb5 DH	143	case AF_INET6:
	144	if (peer->srx.transport.sin6.sin6_port !=
	145	srx.transport.sin6.sin6_port \|\|
	146	memcmp(&peer->srx.transport.sin6.sin6_addr,
	147	&srx.transport.sin6.sin6_addr,
	148	sizeof(struct in6_addr)) != 0)
	149	goto not_found;
	150	break;
d1912747	151	#endif
1291e9d1 DH	152	default:
	153	BUG();
	154	}
	155
1291e9d1 DH	156	_leave(" = %p", conn);
1291e9d1 DH	157	return conn;
17926a79 DH	158	}
17926a79 DH	159
1291e9d1	160	not_found:
17926a79 DH	161	_leave(" = NULL");
17926a79 DH	162	return NULL;
17926a79 DH	163	}
17926a79 DH	164
999b69f8 DH	165	/*
999b69f8 DH	166	* Disconnect a call and clear any channel it occupies when that call
a1399f8b DH	167	* terminates. The caller must hold the channel_lock and must release the
a1399f8b DH	168	* call's ref on the connection.
999b69f8	169	*/
45025bce DH	170	void __rxrpc_disconnect_call(struct rxrpc_connection *conn,
45025bce DH	171	struct rxrpc_call *call)
999b69f8	172	{
01a90a45 DH	173	struct rxrpc_channel *chan =
01a90a45 DH	174	&conn->channels[call->cid & RXRPC_CHANNELMASK];
999b69f8	175
01a90a45	176	_enter("%d,%x", conn->debug_id, call->cid);
999b69f8	177
a1399f8b DH	178	if (rcu_access_pointer(chan->call) == call) {
	179	/* Save the result of the call so that we can repeat it if necessary
	180	* through the channel, whilst disposing of the actual call record.
	181	*/
b1d9f7fd	182	trace_rxrpc_disconnect_call(call);
17e9e23b DH	183	switch (call->completion) {
17e9e23b DH	184	case RXRPC_CALL_SUCCEEDED:
248f219c	185	chan->last_seq = call->rx_hard_ack;
18bfeba5	186	chan->last_type = RXRPC_PACKET_TYPE_ACK;
17e9e23b DH	187	break;
	188	case RXRPC_CALL_LOCALLY_ABORTED:
	189	chan->last_abort = call->abort_code;
	190	chan->last_type = RXRPC_PACKET_TYPE_ABORT;
	191	break;
	192	default:
	193	chan->last_abort = RX_USER_ABORT;
	194	chan->last_type = RXRPC_PACKET_TYPE_ABORT;
	195	break;
18bfeba5	196	}
17e9e23b	197
18bfeba5	198	/* Sync with rxrpc_conn_retransmit(). */
a1399f8b DH	199	smp_wmb();
	200	chan->last_call = chan->call_id;
	201	chan->call_id = chan->call_counter;
e653cfe4	202
a1399f8b	203	rcu_assign_pointer(chan->call, NULL);
999b69f8	204	}
e653cfe4	205
a1399f8b DH	206	_leave("");
	207	}
	208
	209	/*
	210	* Disconnect a call and clear any channel it occupies when that call
	211	* terminates.
	212	*/
	213	void rxrpc_disconnect_call(struct rxrpc_call *call)
	214	{
	215	struct rxrpc_connection *conn = call->conn;
	216
f7aec129 DH	217	call->peer->cong_cwnd = call->cong_cwnd;
f7aec129 DH	218
248f219c	219	spin_lock_bh(&conn->params.peer->lock);
f3344303	220	hlist_del_rcu(&call->error_link);
248f219c DH	221	spin_unlock_bh(&conn->params.peer->lock);
248f219c DH	222
45025bce DH	223	if (rxrpc_is_client_call(call))
	224	return rxrpc_disconnect_client_call(call);
	225
a1399f8b	226	spin_lock(&conn->channel_lock);
45025bce	227	__rxrpc_disconnect_call(conn, call);
e653cfe4 DH	228	spin_unlock(&conn->channel_lock);
	229
	230	call->conn = NULL;
f51b4480	231	conn->idle_timestamp = jiffies;
e653cfe4	232	rxrpc_put_connection(conn);
999b69f8 DH	233	}
999b69f8 DH	234
45025bce DH	235	/*
	236	* Kill off a connection.
	237	*/
	238	void rxrpc_kill_connection(struct rxrpc_connection *conn)
	239	{
2baec2c3 DH	240	struct rxrpc_net *rxnet = conn->params.local->rxnet;
2baec2c3 DH	241
45025bce DH	242	ASSERT(!rcu_access_pointer(conn->channels[0].call) &&
	243	!rcu_access_pointer(conn->channels[1].call) &&
	244	!rcu_access_pointer(conn->channels[2].call) &&
	245	!rcu_access_pointer(conn->channels[3].call));
	246	ASSERT(list_empty(&conn->cache_link));
	247
2baec2c3	248	write_lock(&rxnet->conn_lock);
45025bce	249	list_del_init(&conn->proc_link);
2baec2c3	250	write_unlock(&rxnet->conn_lock);
45025bce DH	251
	252	/* Drain the Rx queue. Note that even though we've unpublished, an
	253	* incoming packet could still be being added to our Rx queue, so we
	254	* will need to drain it again in the RCU cleanup handler.
	255	*/
	256	rxrpc_purge_queue(&conn->rx_queue);
	257
	258	/* Leave final destruction to RCU. The connection processor work item
	259	* must carry a ref on the connection to prevent us getting here whilst
	260	* it is queued or running.
	261	*/
	262	call_rcu(&conn->rcu, rxrpc_destroy_connection);
	263	}
	264
17926a79	265	/*
363deeab DH	266	* Queue a connection's work processor, getting a ref to pass to the work
363deeab DH	267	* queue.
17926a79	268	*/
363deeab	269	bool rxrpc_queue_conn(struct rxrpc_connection *conn)
17926a79	270	{
363deeab	271	const void *here = __builtin_return_address(0);
bfc18e38	272	int n = atomic_fetch_add_unless(&conn->usage, 1, 0);
363deeab DH	273	if (n == 0)
	274	return false;
	275	if (rxrpc_queue_work(&conn->processor))
	276	trace_rxrpc_conn(conn, rxrpc_conn_queued, n + 1, here);
	277	else
	278	rxrpc_put_connection(conn);
	279	return true;
	280	}
	281
	282	/*
	283	* Note the re-emergence of a connection.
	284	*/
	285	void rxrpc_see_connection(struct rxrpc_connection *conn)
	286	{
	287	const void *here = __builtin_return_address(0);
	288	if (conn) {
	289	int n = atomic_read(&conn->usage);
	290
	291	trace_rxrpc_conn(conn, rxrpc_conn_seen, n, here);
	292	}
	293	}
	294
	295	/*
	296	* Get a ref on a connection.
	297	*/
	298	void rxrpc_get_connection(struct rxrpc_connection *conn)
	299	{
	300	const void *here = __builtin_return_address(0);
	301	int n = atomic_inc_return(&conn->usage);
	302
	303	trace_rxrpc_conn(conn, rxrpc_conn_got, n, here);
	304	}
	305
	306	/*
	307	* Try to get a ref on a connection.
	308	*/
	309	struct rxrpc_connection *
	310	rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
	311	{
	312	const void *here = __builtin_return_address(0);
	313
	314	if (conn) {
bfc18e38	315	int n = atomic_fetch_add_unless(&conn->usage, 1, 0);
363deeab DH	316	if (n > 0)
	317	trace_rxrpc_conn(conn, rxrpc_conn_got, n + 1, here);
	318	else
	319	conn = NULL;
	320	}
	321	return conn;
	322	}
	323
3d18cbb7 DH	324	/*
	325	* Set the service connection reap timer.
	326	*/
	327	static void rxrpc_set_service_reap_timer(struct rxrpc_net *rxnet,
	328	unsigned long reap_at)
	329	{
	330	if (rxnet->live)
	331	timer_reduce(&rxnet->service_conn_reap_timer, reap_at);
	332	}
	333
363deeab DH	334	/*
	335	* Release a service connection
	336	*/
	337	void rxrpc_put_service_conn(struct rxrpc_connection *conn)
	338	{
	339	const void *here = __builtin_return_address(0);
	340	int n;
	341
	342	n = atomic_dec_return(&conn->usage);
	343	trace_rxrpc_conn(conn, rxrpc_conn_put_service, n, here);
	344	ASSERTCMP(n, >=, 0);
3d18cbb7 DH	345	if (n == 1)
	346	rxrpc_set_service_reap_timer(conn->params.local->rxnet,
	347	jiffies + rxrpc_connection_expiry);
17926a79 DH	348	}
	349
	350	/*
	351	* destroy a virtual connection
	352	*/
dee46364	353	static void rxrpc_destroy_connection(struct rcu_head *rcu)
17926a79	354	{
dee46364 DH	355	struct rxrpc_connection *conn =
	356	container_of(rcu, struct rxrpc_connection, rcu);
	357
	358	_enter("{%d,u=%d}", conn->debug_id, atomic_read(&conn->usage));
17926a79 DH	359
	360	ASSERTCMP(atomic_read(&conn->usage), ==, 0);
	361
	362	_net("DESTROY CONN %d", conn->debug_id);
	363
3136ef49	364	del_timer_sync(&conn->timer);
17926a79 DH	365	rxrpc_purge_queue(&conn->rx_queue);
17926a79 DH	366
e0e4d82f	367	conn->security->clear(conn);
19ffa01c	368	key_put(conn->params.key);
e0e4d82f	369	key_put(conn->server_key);
aa390bbe	370	rxrpc_put_peer(conn->params.peer);
31f5f9a1 DH	371
31f5f9a1 DH	372	if (atomic_dec_and_test(&conn->params.local->rxnet->nr_conns))
5bb053be	373	wake_up_var(&conn->params.local->rxnet->nr_conns);
aa390bbe	374	rxrpc_put_local(conn->params.local);
e0e4d82f	375
17926a79 DH	376	kfree(conn);
	377	_leave("");
	378	}
	379
	380	/*
45025bce	381	* reap dead service connections
17926a79	382	*/
2baec2c3	383	void rxrpc_service_connection_reaper(struct work_struct *work)
17926a79 DH	384	{
17926a79 DH	385	struct rxrpc_connection conn, _p;
2baec2c3	386	struct rxrpc_net *rxnet =
3d18cbb7	387	container_of(work, struct rxrpc_net, service_conn_reaper);
f859ab61	388	unsigned long expire_at, earliest, idle_timestamp, now;
17926a79 DH	389
	390	LIST_HEAD(graveyard);
	391
	392	_enter("");
	393
f51b4480	394	now = jiffies;
f859ab61	395	earliest = now + MAX_JIFFY_OFFSET;
17926a79	396
2baec2c3 DH	397	write_lock(&rxnet->conn_lock);
2baec2c3 DH	398	list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
001c1122 DH	399	ASSERTCMP(atomic_read(&conn->usage), >, 0);
001c1122 DH	400	if (likely(atomic_read(&conn->usage) > 1))
17926a79	401	continue;
00e90712 DH	402	if (conn->state == RXRPC_CONN_SERVICE_PREALLOC)
00e90712 DH	403	continue;
17926a79	404
f859ab61 DH	405	if (rxnet->live) {
	406	idle_timestamp = READ_ONCE(conn->idle_timestamp);
	407	expire_at = idle_timestamp + rxrpc_connection_expiry * HZ;
	408	if (conn->params.local->service_closed)
	409	expire_at = idle_timestamp + rxrpc_closed_conn_expiry * HZ;
	410
	411	_debug("reap CONN %d { u=%d,t=%ld }",
	412	conn->debug_id, atomic_read(&conn->usage),
	413	(long)expire_at - (long)now);
	414
	415	if (time_before(now, expire_at)) {
	416	if (time_before(expire_at, earliest))
	417	earliest = expire_at;
	418	continue;
	419	}
17926a79	420	}
001c1122 DH	421
	422	/* The usage count sits at 1 whilst the object is unused on the
	423	* list; we reduce that to 0 to make the object unavailable.
	424	*/
	425	if (atomic_cmpxchg(&conn->usage, 1, 0) != 1)
	426	continue;
88f2a825	427	trace_rxrpc_conn(conn, rxrpc_conn_reap_service, 0, NULL);
001c1122 DH	428
001c1122 DH	429	if (rxrpc_conn_is_client(conn))
45025bce	430	BUG();
001c1122 DH	431	else
	432	rxrpc_unpublish_service_conn(conn);
	433
	434	list_move_tail(&conn->link, &graveyard);
17926a79	435	}
2baec2c3	436	write_unlock(&rxnet->conn_lock);
17926a79	437
f859ab61 DH	438	if (earliest != now + MAX_JIFFY_OFFSET) {
f859ab61 DH	439	_debug("reschedule reaper %ld", (long)earliest - (long)now);
f51b4480	440	ASSERT(time_after(earliest, now));
3d7682af	441	rxrpc_set_service_reap_timer(rxnet, earliest);
17926a79 DH	442	}
17926a79 DH	443
17926a79 DH	444	while (!list_empty(&graveyard)) {
	445	conn = list_entry(graveyard.next, struct rxrpc_connection,
	446	link);
	447	list_del_init(&conn->link);
	448
	449	ASSERTCMP(atomic_read(&conn->usage), ==, 0);
45025bce	450	rxrpc_kill_connection(conn);
17926a79 DH	451	}
	452
	453	_leave("");
	454	}
	455
	456	/*
45025bce DH	457	* preemptively destroy all the service connection records rather than
45025bce DH	458	* waiting for them to time out
17926a79	459	*/
2baec2c3	460	void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
17926a79	461	{
dee46364 DH	462	struct rxrpc_connection conn, _p;
	463	bool leak = false;
	464
17926a79 DH	465	_enter("");
17926a79 DH	466
31f5f9a1	467	atomic_dec(&rxnet->nr_conns);
2baec2c3	468	rxrpc_destroy_all_client_connections(rxnet);
45025bce	469
3d18cbb7 DH	470	del_timer_sync(&rxnet->service_conn_reap_timer);
3d18cbb7 DH	471	rxrpc_queue_work(&rxnet->service_conn_reaper);
dee46364 DH	472	flush_workqueue(rxrpc_workqueue);
dee46364 DH	473
2baec2c3 DH	474	write_lock(&rxnet->conn_lock);
2baec2c3 DH	475	list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
dee46364 DH	476	pr_err("AF_RXRPC: Leaked conn %p {%d}\n",
	477	conn, atomic_read(&conn->usage));
	478	leak = true;
	479	}
2baec2c3	480	write_unlock(&rxnet->conn_lock);
dee46364 DH	481	BUG_ON(leak);
dee46364 DH	482
2baec2c3	483	ASSERT(list_empty(&rxnet->conn_proc_list));
17926a79	484
31f5f9a1 DH	485	/* We need to wait for the connections to be destroyed by RCU as they
	486	* pin things that we still need to get rid of.
	487	*/
5bb053be	488	wait_var_event(&rxnet->nr_conns, !atomic_read(&rxnet->nr_conns));
17926a79 DH	489	_leave("");
17926a79 DH	490	}