[people/ms/linux.git] / net / rxrpc / conn_object.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* RxRPC virtual connection handler, common bits.
 *
 * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#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);
		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->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 || refcount_read(&conn->ref) == 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 || refcount_read(&conn->ref) == 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_CALL_DEAD;
			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;

	if (!hlist_unhashed(&call->error_link)) {
		spin_lock_bh(&call->peer->lock);
		hlist_del_rcu(&call->error_link);
		spin_unlock_bh(&call->peer->lock);
	}

	if (rxrpc_is_client_call(call))
		return rxrpc_disconnect_client_call(conn->bundle, call);

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

	set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
	conn->idle_timestamp = jiffies;
}

/*
 * 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 r;

	if (!__refcount_inc_not_zero(&conn->ref, &r))
		return false;
	if (rxrpc_queue_work(&conn->processor))
		trace_rxrpc_conn(conn->debug_id, rxrpc_conn_queued, r + 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 = refcount_read(&conn->ref);

		trace_rxrpc_conn(conn->debug_id, rxrpc_conn_seen, n, here);
	}
}

/*
 * Get a ref on a connection.
 */
struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *conn)
{
	const void *here = __builtin_return_address(0);
	int r;

	__refcount_inc(&conn->ref, &r);
	trace_rxrpc_conn(conn->debug_id, rxrpc_conn_got, r, here);
	return conn;
}

/*
 * 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);
	int r;

	if (conn) {
		if (__refcount_inc_not_zero(&conn->ref, &r))
			trace_rxrpc_conn(conn->debug_id, rxrpc_conn_got, r + 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);
	unsigned int debug_id = conn->debug_id;
	int r;

	__refcount_dec(&conn->ref, &r);
	trace_rxrpc_conn(debug_id, rxrpc_conn_put_service, r - 1, here);
	if (r - 1 == 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, refcount_read(&conn->ref));

	ASSERTCMP(refcount_read(&conn->ref), ==, 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);
	rxrpc_put_bundle(conn->bundle);
	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(refcount_read(&conn->ref), >, 0);
		if (likely(refcount_read(&conn->ref) > 1))
			continue;
		if (conn->state == RXRPC_CONN_SERVICE_PREALLOC)
			continue;

		if (rxnet->live && !conn->params.local->dead) {
			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, refcount_read(&conn->ref),
			       (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 (!refcount_dec_if_one(&conn->ref))
			continue;
		trace_rxrpc_conn(conn->debug_id, 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(refcount_read(&conn->ref), ==, 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, refcount_read(&conn->ref));
		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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
45025bce	2	/* RxRPC virtual connection handler, common bits.
17926a79	3	*
45025bce	4	* Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
17926a79	5	* Written by David Howells (dhowells@redhat.com)
17926a79 DH	6	*/
17926a79 DH	7
9b6d5398 JP	8	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9b6d5398 JP	9
17926a79	10	#include <linux/module.h>
5a0e3ad6	11	#include <linux/slab.h>
17926a79 DH	12	#include <linux/net.h>
17926a79 DH	13	#include <linux/skbuff.h>
17926a79 DH	14	#include "ar-internal.h"
17926a79 DH	15
5873c083 DH	16	/*
	17	* Time till a connection expires after last use (in seconds).
	18	*/
f859ab61 DH	19	unsigned int __read_mostly rxrpc_connection_expiry = 10 * 60;
f859ab61 DH	20	unsigned int __read_mostly rxrpc_closed_conn_expiry = 10;
5873c083	21
45025bce DH	22	static void rxrpc_destroy_connection(struct rcu_head *);
45025bce DH	23
3136ef49 DH	24	static void rxrpc_connection_timer(struct timer_list *timer)
	25	{
	26	struct rxrpc_connection *conn =
	27	container_of(timer, struct rxrpc_connection, timer);
	28
	29	rxrpc_queue_conn(conn);
	30	}
	31
17926a79 DH	32	/*
	33	* allocate a new connection
	34	*/
c6d2b8d7	35	struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
17926a79 DH	36	{
	37	struct rxrpc_connection *conn;
	38
	39	_enter("");
	40
	41	conn = kzalloc(sizeof(struct rxrpc_connection), gfp);
	42	if (conn) {
45025bce	43	INIT_LIST_HEAD(&conn->cache_link);
3136ef49	44	timer_setup(&conn->timer, &rxrpc_connection_timer, 0);
17926a79	45	INIT_WORK(&conn->processor, &rxrpc_process_connection);
4d028b2c	46	INIT_LIST_HEAD(&conn->proc_link);
999b69f8	47	INIT_LIST_HEAD(&conn->link);
17926a79	48	skb_queue_head_init(&conn->rx_queue);
e0e4d82f	49	conn->security = &rxrpc_no_security;
17926a79	50	spin_lock_init(&conn->state_lock);
17926a79	51	conn->debug_id = atomic_inc_return(&rxrpc_debug_id);
f51b4480	52	conn->idle_timestamp = jiffies;
17926a79 DH	53	}
17926a79 DH	54
16c61add	55	_leave(" = %p{%d}", conn, conn ? conn->debug_id : 0);
17926a79 DH	56	return conn;
	57	}
	58
17926a79	59	/*
8496af50 DH	60	* Look up a connection in the cache by protocol parameters.
	61	*
	62	* If successful, a pointer to the connection is returned, but no ref is taken.
	63	* NULL is returned if there is no match.
	64	*
0099dc58 DH	65	* When searching for a service call, if we find a peer but no connection, we
	66	* return that through *_peer in case we need to create a new service call.
	67	*
8496af50	68	* The caller must be holding the RCU read lock.
17926a79	69	*/
8496af50	70	struct rxrpc_connection rxrpc_find_connection_rcu(struct rxrpc_local local,
0099dc58 DH	71	struct sk_buff *skb,
0099dc58 DH	72	struct rxrpc_peer **_peer)
17926a79 DH	73	{
17926a79 DH	74	struct rxrpc_connection *conn;
1291e9d1	75	struct rxrpc_conn_proto k;
42886ffe	76	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1291e9d1 DH	77	struct sockaddr_rxrpc srx;
1291e9d1 DH	78	struct rxrpc_peer *peer;
17926a79	79
8496af50	80	_enter(",%x", sp->hdr.cid & RXRPC_CIDMASK);
17926a79	81
5a790b73	82	if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
1291e9d1	83	goto not_found;
17926a79	84
46894a13 DH	85	if (srx.transport.family != local->srx.transport.family &&
	86	(srx.transport.family == AF_INET &&
	87	local->srx.transport.family != AF_INET6)) {
1291e9d1 DH	88	pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n",
	89	srx.transport.family,
	90	local->srx.transport.family);
	91	goto not_found;
	92	}
	93
	94	k.epoch = sp->hdr.epoch;
	95	k.cid = sp->hdr.cid & RXRPC_CIDMASK;
17926a79	96
dc71db34	97	if (rxrpc_to_server(sp)) {
1291e9d1 DH	98	/* We need to look up service connections by the full protocol
	99	* parameter set. We look up the peer first as an intermediate
	100	* step and then the connection from the peer's tree.
	101	*/
	102	peer = rxrpc_lookup_peer_rcu(local, &srx);
	103	if (!peer)
	104	goto not_found;
0099dc58	105	*_peer = peer;
8496af50	106	conn = rxrpc_find_service_conn_rcu(peer, skb);
a0575429	107	if (!conn \|\| refcount_read(&conn->ref) == 0)
8496af50 DH	108	goto not_found;
	109	_leave(" = %p", conn);
	110	return conn;
4a3388c8	111	} else {
8496af50 DH	112	/* Look up client connections by connection ID alone as their
	113	* IDs are unique for this machine.
	114	*/
1291e9d1	115	conn = idr_find(&rxrpc_client_conn_ids,
8496af50	116	sp->hdr.cid >> RXRPC_CIDSHIFT);
a0575429	117	if (!conn \|\| refcount_read(&conn->ref) == 0) {
8496af50 DH	118	_debug("no conn");
	119	goto not_found;
	120	}
	121
	122	if (conn->proto.epoch != k.epoch \|\|
1291e9d1 DH	123	conn->params.local != local)
	124	goto not_found;
	125
	126	peer = conn->params.peer;
	127	switch (srx.transport.family) {
	128	case AF_INET:
	129	if (peer->srx.transport.sin.sin_port !=
	130	srx.transport.sin.sin_port \|\|
	131	peer->srx.transport.sin.sin_addr.s_addr !=
	132	srx.transport.sin.sin_addr.s_addr)
	133	goto not_found;
	134	break;
d1912747	135	#ifdef CONFIG_AF_RXRPC_IPV6
75b54cb5 DH	136	case AF_INET6:
	137	if (peer->srx.transport.sin6.sin6_port !=
	138	srx.transport.sin6.sin6_port \|\|
	139	memcmp(&peer->srx.transport.sin6.sin6_addr,
	140	&srx.transport.sin6.sin6_addr,
	141	sizeof(struct in6_addr)) != 0)
	142	goto not_found;
	143	break;
d1912747	144	#endif
1291e9d1 DH	145	default:
	146	BUG();
	147	}
	148
1291e9d1 DH	149	_leave(" = %p", conn);
1291e9d1 DH	150	return conn;
17926a79 DH	151	}
17926a79 DH	152
1291e9d1	153	not_found:
17926a79 DH	154	_leave(" = NULL");
17926a79 DH	155	return NULL;
17926a79 DH	156	}
17926a79 DH	157
999b69f8 DH	158	/*
999b69f8 DH	159	* Disconnect a call and clear any channel it occupies when that call
a1399f8b DH	160	* terminates. The caller must hold the channel_lock and must release the
a1399f8b DH	161	* call's ref on the connection.
999b69f8	162	*/
45025bce DH	163	void __rxrpc_disconnect_call(struct rxrpc_connection *conn,
45025bce DH	164	struct rxrpc_call *call)
999b69f8	165	{
01a90a45 DH	166	struct rxrpc_channel *chan =
01a90a45 DH	167	&conn->channels[call->cid & RXRPC_CHANNELMASK];
999b69f8	168
01a90a45	169	_enter("%d,%x", conn->debug_id, call->cid);
999b69f8	170
a1399f8b DH	171	if (rcu_access_pointer(chan->call) == call) {
	172	/* Save the result of the call so that we can repeat it if necessary
	173	* through the channel, whilst disposing of the actual call record.
	174	*/
b1d9f7fd	175	trace_rxrpc_disconnect_call(call);
17e9e23b DH	176	switch (call->completion) {
17e9e23b DH	177	case RXRPC_CALL_SUCCEEDED:
248f219c	178	chan->last_seq = call->rx_hard_ack;
18bfeba5	179	chan->last_type = RXRPC_PACKET_TYPE_ACK;
17e9e23b DH	180	break;
	181	case RXRPC_CALL_LOCALLY_ABORTED:
	182	chan->last_abort = call->abort_code;
	183	chan->last_type = RXRPC_PACKET_TYPE_ABORT;
	184	break;
	185	default:
de696c47	186	chan->last_abort = RX_CALL_DEAD;
17e9e23b DH	187	chan->last_type = RXRPC_PACKET_TYPE_ABORT;
17e9e23b DH	188	break;
18bfeba5	189	}
17e9e23b	190
18bfeba5	191	/* Sync with rxrpc_conn_retransmit(). */
a1399f8b DH	192	smp_wmb();
	193	chan->last_call = chan->call_id;
	194	chan->call_id = chan->call_counter;
e653cfe4	195
a1399f8b	196	rcu_assign_pointer(chan->call, NULL);
999b69f8	197	}
e653cfe4	198
a1399f8b DH	199	_leave("");
	200	}
	201
	202	/*
	203	* Disconnect a call and clear any channel it occupies when that call
	204	* terminates.
	205	*/
	206	void rxrpc_disconnect_call(struct rxrpc_call *call)
	207	{
	208	struct rxrpc_connection *conn = call->conn;
	209
f7aec129 DH	210	call->peer->cong_cwnd = call->cong_cwnd;
f7aec129 DH	211
65550098 DH	212	if (!hlist_unhashed(&call->error_link)) {
	213	spin_lock_bh(&call->peer->lock);
	214	hlist_del_rcu(&call->error_link);
	215	spin_unlock_bh(&call->peer->lock);
	216	}
248f219c	217
45025bce	218	if (rxrpc_is_client_call(call))
245500d8	219	return rxrpc_disconnect_client_call(conn->bundle, call);
45025bce	220
245500d8	221	spin_lock(&conn->bundle->channel_lock);
45025bce	222	__rxrpc_disconnect_call(conn, call);
245500d8	223	spin_unlock(&conn->bundle->channel_lock);
e653cfe4	224
b39a934e	225	set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
f51b4480	226	conn->idle_timestamp = jiffies;
999b69f8 DH	227	}
999b69f8 DH	228
45025bce DH	229	/*
	230	* Kill off a connection.
	231	*/
	232	void rxrpc_kill_connection(struct rxrpc_connection *conn)
	233	{
2baec2c3 DH	234	struct rxrpc_net *rxnet = conn->params.local->rxnet;
2baec2c3 DH	235
45025bce DH	236	ASSERT(!rcu_access_pointer(conn->channels[0].call) &&
	237	!rcu_access_pointer(conn->channels[1].call) &&
	238	!rcu_access_pointer(conn->channels[2].call) &&
	239	!rcu_access_pointer(conn->channels[3].call));
	240	ASSERT(list_empty(&conn->cache_link));
	241
2baec2c3	242	write_lock(&rxnet->conn_lock);
45025bce	243	list_del_init(&conn->proc_link);
2baec2c3	244	write_unlock(&rxnet->conn_lock);
45025bce DH	245
	246	/* Drain the Rx queue. Note that even though we've unpublished, an
	247	* incoming packet could still be being added to our Rx queue, so we
	248	* will need to drain it again in the RCU cleanup handler.
	249	*/
	250	rxrpc_purge_queue(&conn->rx_queue);
	251
	252	/* Leave final destruction to RCU. The connection processor work item
	253	* must carry a ref on the connection to prevent us getting here whilst
	254	* it is queued or running.
	255	*/
	256	call_rcu(&conn->rcu, rxrpc_destroy_connection);
	257	}
	258
17926a79	259	/*
363deeab DH	260	* Queue a connection's work processor, getting a ref to pass to the work
363deeab DH	261	* queue.
17926a79	262	*/
363deeab	263	bool rxrpc_queue_conn(struct rxrpc_connection *conn)
17926a79	264	{
363deeab	265	const void *here = __builtin_return_address(0);
a0575429 DH	266	int r;
	267
	268	if (!__refcount_inc_not_zero(&conn->ref, &r))
363deeab DH	269	return false;
363deeab DH	270	if (rxrpc_queue_work(&conn->processor))
a0575429	271	trace_rxrpc_conn(conn->debug_id, rxrpc_conn_queued, r + 1, here);
363deeab DH	272	else
	273	rxrpc_put_connection(conn);
	274	return true;
	275	}
	276
	277	/*
	278	* Note the re-emergence of a connection.
	279	*/
	280	void rxrpc_see_connection(struct rxrpc_connection *conn)
	281	{
	282	const void *here = __builtin_return_address(0);
	283	if (conn) {
a0575429	284	int n = refcount_read(&conn->ref);
363deeab	285
4c1295dc	286	trace_rxrpc_conn(conn->debug_id, rxrpc_conn_seen, n, here);
363deeab DH	287	}
	288	}
	289
	290	/*
	291	* Get a ref on a connection.
	292	*/
245500d8	293	struct rxrpc_connection rxrpc_get_connection(struct rxrpc_connection conn)
363deeab DH	294	{
363deeab DH	295	const void *here = __builtin_return_address(0);
a0575429	296	int r;
363deeab	297
a0575429 DH	298	__refcount_inc(&conn->ref, &r);
a0575429 DH	299	trace_rxrpc_conn(conn->debug_id, rxrpc_conn_got, r, here);
245500d8	300	return conn;
363deeab DH	301	}
	302
	303	/*
	304	* Try to get a ref on a connection.
	305	*/
	306	struct rxrpc_connection *
	307	rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
	308	{
	309	const void *here = __builtin_return_address(0);
a0575429	310	int r;
363deeab DH	311
363deeab DH	312	if (conn) {
a0575429 DH	313	if (__refcount_inc_not_zero(&conn->ref, &r))
a0575429 DH	314	trace_rxrpc_conn(conn->debug_id, rxrpc_conn_got, r + 1, here);
363deeab DH	315	else
	316	conn = NULL;
	317	}
	318	return conn;
	319	}
	320
3d18cbb7 DH	321	/*
	322	* Set the service connection reap timer.
	323	*/
	324	static void rxrpc_set_service_reap_timer(struct rxrpc_net *rxnet,
	325	unsigned long reap_at)
	326	{
	327	if (rxnet->live)
	328	timer_reduce(&rxnet->service_conn_reap_timer, reap_at);
	329	}
	330
363deeab DH	331	/*
	332	* Release a service connection
	333	*/
	334	void rxrpc_put_service_conn(struct rxrpc_connection *conn)
	335	{
	336	const void *here = __builtin_return_address(0);
4c1295dc	337	unsigned int debug_id = conn->debug_id;
a0575429	338	int r;
363deeab	339
a0575429 DH	340	__refcount_dec(&conn->ref, &r);
	341	trace_rxrpc_conn(debug_id, rxrpc_conn_put_service, r - 1, here);
	342	if (r - 1 == 1)
3d18cbb7 DH	343	rxrpc_set_service_reap_timer(conn->params.local->rxnet,
3d18cbb7 DH	344	jiffies + rxrpc_connection_expiry);
17926a79 DH	345	}
	346
	347	/*
	348	* destroy a virtual connection
	349	*/
dee46364	350	static void rxrpc_destroy_connection(struct rcu_head *rcu)
17926a79	351	{
dee46364 DH	352	struct rxrpc_connection *conn =
	353	container_of(rcu, struct rxrpc_connection, rcu);
	354
a0575429	355	_enter("{%d,u=%d}", conn->debug_id, refcount_read(&conn->ref));
17926a79	356
a0575429	357	ASSERTCMP(refcount_read(&conn->ref), ==, 0);
17926a79 DH	358
	359	_net("DESTROY CONN %d", conn->debug_id);
	360
3136ef49	361	del_timer_sync(&conn->timer);
17926a79 DH	362	rxrpc_purge_queue(&conn->rx_queue);
17926a79 DH	363
e0e4d82f	364	conn->security->clear(conn);
19ffa01c	365	key_put(conn->params.key);
245500d8	366	rxrpc_put_bundle(conn->bundle);
aa390bbe	367	rxrpc_put_peer(conn->params.peer);
31f5f9a1 DH	368
31f5f9a1 DH	369	if (atomic_dec_and_test(&conn->params.local->rxnet->nr_conns))
5bb053be	370	wake_up_var(&conn->params.local->rxnet->nr_conns);
aa390bbe	371	rxrpc_put_local(conn->params.local);
e0e4d82f	372
17926a79 DH	373	kfree(conn);
	374	_leave("");
	375	}
	376
	377	/*
45025bce	378	* reap dead service connections
17926a79	379	*/
2baec2c3	380	void rxrpc_service_connection_reaper(struct work_struct *work)
17926a79 DH	381	{
17926a79 DH	382	struct rxrpc_connection conn, _p;
2baec2c3	383	struct rxrpc_net *rxnet =
3d18cbb7	384	container_of(work, struct rxrpc_net, service_conn_reaper);
f859ab61	385	unsigned long expire_at, earliest, idle_timestamp, now;
17926a79 DH	386
	387	LIST_HEAD(graveyard);
	388
	389	_enter("");
	390
f51b4480	391	now = jiffies;
f859ab61	392	earliest = now + MAX_JIFFY_OFFSET;
17926a79	393
2baec2c3 DH	394	write_lock(&rxnet->conn_lock);
2baec2c3 DH	395	list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
a0575429 DH	396	ASSERTCMP(refcount_read(&conn->ref), >, 0);
a0575429 DH	397	if (likely(refcount_read(&conn->ref) > 1))
17926a79	398	continue;
00e90712 DH	399	if (conn->state == RXRPC_CONN_SERVICE_PREALLOC)
00e90712 DH	400	continue;
17926a79	401
d12040b6	402	if (rxnet->live && !conn->params.local->dead) {
f859ab61 DH	403	idle_timestamp = READ_ONCE(conn->idle_timestamp);
	404	expire_at = idle_timestamp + rxrpc_connection_expiry * HZ;
	405	if (conn->params.local->service_closed)
	406	expire_at = idle_timestamp + rxrpc_closed_conn_expiry * HZ;
	407
	408	_debug("reap CONN %d { u=%d,t=%ld }",
a0575429	409	conn->debug_id, refcount_read(&conn->ref),
f859ab61 DH	410	(long)expire_at - (long)now);
	411
	412	if (time_before(now, expire_at)) {
	413	if (time_before(expire_at, earliest))
	414	earliest = expire_at;
	415	continue;
	416	}
17926a79	417	}
001c1122 DH	418
	419	/* The usage count sits at 1 whilst the object is unused on the
	420	* list; we reduce that to 0 to make the object unavailable.
	421	*/
a0575429	422	if (!refcount_dec_if_one(&conn->ref))
001c1122	423	continue;
4c1295dc	424	trace_rxrpc_conn(conn->debug_id, rxrpc_conn_reap_service, 0, NULL);
001c1122 DH	425
001c1122 DH	426	if (rxrpc_conn_is_client(conn))
45025bce	427	BUG();
001c1122 DH	428	else
	429	rxrpc_unpublish_service_conn(conn);
	430
	431	list_move_tail(&conn->link, &graveyard);
17926a79	432	}
2baec2c3	433	write_unlock(&rxnet->conn_lock);
17926a79	434
f859ab61 DH	435	if (earliest != now + MAX_JIFFY_OFFSET) {
f859ab61 DH	436	_debug("reschedule reaper %ld", (long)earliest - (long)now);
f51b4480	437	ASSERT(time_after(earliest, now));
3d7682af	438	rxrpc_set_service_reap_timer(rxnet, earliest);
17926a79 DH	439	}
17926a79 DH	440
17926a79 DH	441	while (!list_empty(&graveyard)) {
	442	conn = list_entry(graveyard.next, struct rxrpc_connection,
	443	link);
	444	list_del_init(&conn->link);
	445
a0575429	446	ASSERTCMP(refcount_read(&conn->ref), ==, 0);
45025bce	447	rxrpc_kill_connection(conn);
17926a79 DH	448	}
	449
	450	_leave("");
	451	}
	452
	453	/*
45025bce DH	454	* preemptively destroy all the service connection records rather than
45025bce DH	455	* waiting for them to time out
17926a79	456	*/
2baec2c3	457	void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
17926a79	458	{
dee46364 DH	459	struct rxrpc_connection conn, _p;
	460	bool leak = false;
	461
17926a79 DH	462	_enter("");
17926a79 DH	463
31f5f9a1	464	atomic_dec(&rxnet->nr_conns);
2baec2c3	465	rxrpc_destroy_all_client_connections(rxnet);
45025bce	466
3d18cbb7 DH	467	del_timer_sync(&rxnet->service_conn_reap_timer);
3d18cbb7 DH	468	rxrpc_queue_work(&rxnet->service_conn_reaper);
dee46364 DH	469	flush_workqueue(rxrpc_workqueue);
dee46364 DH	470
2baec2c3 DH	471	write_lock(&rxnet->conn_lock);
2baec2c3 DH	472	list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
dee46364	473	pr_err("AF_RXRPC: Leaked conn %p {%d}\n",
a0575429	474	conn, refcount_read(&conn->ref));
dee46364 DH	475	leak = true;
dee46364 DH	476	}
2baec2c3	477	write_unlock(&rxnet->conn_lock);
dee46364 DH	478	BUG_ON(leak);
dee46364 DH	479
2baec2c3	480	ASSERT(list_empty(&rxnet->conn_proc_list));
17926a79	481
31f5f9a1 DH	482	/* We need to wait for the connections to be destroyed by RCU as they
	483	* pin things that we still need to get rid of.
	484	*/
5bb053be	485	wait_var_event(&rxnet->nr_conns, !atomic_read(&rxnet->nr_conns));
17926a79 DH	486	_leave("");
17926a79 DH	487	}