blob: 0df9d1af8edb6b09c1c0252afdd7fc3cfc13d321 [file] [log] [blame]
David Howells17926a72007-04-26 15:48:28 -07001/* RxRPC individual remote procedure call handling
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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
Joe Perches9b6d5392016-06-02 12:08:52 -070012#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
David Howells17926a72007-04-26 15:48:28 -070015#include <linux/module.h>
16#include <linux/circ_buf.h>
Tim Smith77276402014-03-03 23:04:45 +000017#include <linux/spinlock_types.h>
David Howells17926a72007-04-26 15:48:28 -070018#include <net/sock.h>
19#include <net/af_rxrpc.h>
20#include "ar-internal.h"
21
David Howells5873c082014-02-07 18:58:44 +000022/*
23 * Maximum lifetime of a call (in jiffies).
24 */
David Howellsdad8aff2016-03-09 23:22:56 +000025unsigned int rxrpc_max_call_lifetime = 60 * HZ;
David Howells5873c082014-02-07 18:58:44 +000026
David Howells5b8848d2016-03-04 15:53:46 +000027const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
David Howellsf5c17aa2016-08-30 09:49:28 +010028 [RXRPC_CALL_UNINITIALISED] = "Uninit ",
David Howells999b69f2016-06-17 15:42:35 +010029 [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
David Howells1f8481d2007-05-22 16:14:24 -070030 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
31 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
32 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
David Howells00e90712016-09-08 11:10:12 +010033 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
David Howells1f8481d2007-05-22 16:14:24 -070034 [RXRPC_CALL_SERVER_SECURING] = "SvSecure",
35 [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
36 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
37 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
38 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
39 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
40 [RXRPC_CALL_COMPLETE] = "Complete",
David Howellsf5c17aa2016-08-30 09:49:28 +010041};
42
43const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
44 [RXRPC_CALL_SUCCEEDED] = "Complete",
David Howells1f8481d2007-05-22 16:14:24 -070045 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
46 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
David Howellsf5c17aa2016-08-30 09:49:28 +010047 [RXRPC_CALL_LOCAL_ERROR] = "LocError",
David Howells1f8481d2007-05-22 16:14:24 -070048 [RXRPC_CALL_NETWORK_ERROR] = "NetError",
David Howells1f8481d2007-05-22 16:14:24 -070049};
50
David Howellsfff72422016-09-07 14:34:21 +010051const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = {
52 [rxrpc_call_new_client] = "NWc",
53 [rxrpc_call_new_service] = "NWs",
54 [rxrpc_call_queued] = "QUE",
55 [rxrpc_call_queued_ref] = "QUR",
David Howellsa84a46d2016-09-17 10:49:14 +010056 [rxrpc_call_connected] = "CON",
57 [rxrpc_call_release] = "RLS",
David Howellsfff72422016-09-07 14:34:21 +010058 [rxrpc_call_seen] = "SEE",
59 [rxrpc_call_got] = "GOT",
David Howellsfff72422016-09-07 14:34:21 +010060 [rxrpc_call_got_userid] = "Gus",
David Howellscbd00892016-09-13 09:12:34 +010061 [rxrpc_call_got_kernel] = "Gke",
David Howellsfff72422016-09-07 14:34:21 +010062 [rxrpc_call_put] = "PUT",
David Howellsfff72422016-09-07 14:34:21 +010063 [rxrpc_call_put_userid] = "Pus",
David Howellscbd00892016-09-13 09:12:34 +010064 [rxrpc_call_put_kernel] = "Pke",
David Howellsfff72422016-09-07 14:34:21 +010065 [rxrpc_call_put_noqueue] = "PNQ",
David Howellsa84a46d2016-09-17 10:49:14 +010066 [rxrpc_call_error] = "*E*",
David Howellsfff72422016-09-07 14:34:21 +010067};
68
David Howells17926a72007-04-26 15:48:28 -070069struct kmem_cache *rxrpc_call_jar;
70LIST_HEAD(rxrpc_calls);
71DEFINE_RWLOCK(rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -070072
David Howells248f2192016-09-08 11:10:12 +010073static void rxrpc_call_timer_expired(unsigned long _call)
74{
75 struct rxrpc_call *call = (struct rxrpc_call *)_call;
76
77 _enter("%d", call->debug_id);
78
79 if (call->state < RXRPC_CALL_COMPLETE)
80 rxrpc_queue_call(call);
81}
David Howells17926a72007-04-26 15:48:28 -070082
83/*
David Howells2341e072016-06-09 23:02:51 +010084 * find an extant server call
85 * - called in process context with IRQs enabled
86 */
87struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
88 unsigned long user_call_ID)
89{
90 struct rxrpc_call *call;
91 struct rb_node *p;
92
93 _enter("%p,%lx", rx, user_call_ID);
94
95 read_lock(&rx->call_lock);
96
97 p = rx->calls.rb_node;
98 while (p) {
99 call = rb_entry(p, struct rxrpc_call, sock_node);
100
101 if (user_call_ID < call->user_call_ID)
102 p = p->rb_left;
103 else if (user_call_ID > call->user_call_ID)
104 p = p->rb_right;
105 else
106 goto found_extant_call;
107 }
108
109 read_unlock(&rx->call_lock);
110 _leave(" = NULL");
111 return NULL;
112
113found_extant_call:
David Howellsfff72422016-09-07 14:34:21 +0100114 rxrpc_get_call(call, rxrpc_call_got);
David Howells2341e072016-06-09 23:02:51 +0100115 read_unlock(&rx->call_lock);
116 _leave(" = %p [%d]", call, atomic_read(&call->usage));
117 return call;
118}
119
120/*
David Howells17926a72007-04-26 15:48:28 -0700121 * allocate a new call
122 */
David Howells00e90712016-09-08 11:10:12 +0100123struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
David Howells17926a72007-04-26 15:48:28 -0700124{
125 struct rxrpc_call *call;
126
127 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
128 if (!call)
129 return NULL;
130
David Howells248f2192016-09-08 11:10:12 +0100131 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
132 sizeof(struct sk_buff *),
David Howells17926a72007-04-26 15:48:28 -0700133 gfp);
David Howells248f2192016-09-08 11:10:12 +0100134 if (!call->rxtx_buffer)
135 goto nomem;
David Howells17926a72007-04-26 15:48:28 -0700136
David Howells248f2192016-09-08 11:10:12 +0100137 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
138 if (!call->rxtx_annotations)
139 goto nomem_2;
140
141 setup_timer(&call->timer, rxrpc_call_timer_expired,
142 (unsigned long)call);
David Howells17926a72007-04-26 15:48:28 -0700143 INIT_WORK(&call->processor, &rxrpc_process_call);
David Howells999b69f2016-06-17 15:42:35 +0100144 INIT_LIST_HEAD(&call->link);
David Howells45025bc2016-08-24 07:30:52 +0100145 INIT_LIST_HEAD(&call->chan_wait_link);
David Howells17926a72007-04-26 15:48:28 -0700146 INIT_LIST_HEAD(&call->accept_link);
David Howells248f2192016-09-08 11:10:12 +0100147 INIT_LIST_HEAD(&call->recvmsg_link);
148 INIT_LIST_HEAD(&call->sock_link);
David Howells45025bc2016-08-24 07:30:52 +0100149 init_waitqueue_head(&call->waitq);
David Howells17926a72007-04-26 15:48:28 -0700150 spin_lock_init(&call->lock);
151 rwlock_init(&call->state_lock);
152 atomic_set(&call->usage, 1);
153 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
David Howells17926a72007-04-26 15:48:28 -0700154
155 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
156
David Howells248f2192016-09-08 11:10:12 +0100157 /* Leave space in the ring to handle a maxed-out jumbo packet */
David Howells75e42122016-09-13 22:36:22 +0100158 call->rx_winsize = rxrpc_rx_window_size;
David Howells248f2192016-09-08 11:10:12 +0100159 call->tx_winsize = 16;
160 call->rx_expect_next = 1;
David Howells17926a72007-04-26 15:48:28 -0700161 return call;
David Howells248f2192016-09-08 11:10:12 +0100162
163nomem_2:
164 kfree(call->rxtx_buffer);
165nomem:
166 kmem_cache_free(rxrpc_call_jar, call);
167 return NULL;
David Howells17926a72007-04-26 15:48:28 -0700168}
169
170/*
David Howells999b69f2016-06-17 15:42:35 +0100171 * Allocate a new client call.
David Howells17926a72007-04-26 15:48:28 -0700172 */
David Howells248f2192016-09-08 11:10:12 +0100173static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
David Howellsaa390bb2016-06-17 10:06:56 +0100174 gfp_t gfp)
David Howells17926a72007-04-26 15:48:28 -0700175{
176 struct rxrpc_call *call;
David Howells17926a72007-04-26 15:48:28 -0700177
178 _enter("");
179
David Howells17926a72007-04-26 15:48:28 -0700180 call = rxrpc_alloc_call(gfp);
181 if (!call)
182 return ERR_PTR(-ENOMEM);
David Howells999b69f2016-06-17 15:42:35 +0100183 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
David Howells999b69f2016-06-17 15:42:35 +0100184 call->service_id = srx->srx_service;
David Howells999b69f2016-06-17 15:42:35 +0100185
186 _leave(" = %p", call);
187 return call;
188}
189
190/*
David Howells248f2192016-09-08 11:10:12 +0100191 * Initiate the call ack/resend/expiry timer.
David Howells999b69f2016-06-17 15:42:35 +0100192 */
David Howells248f2192016-09-08 11:10:12 +0100193static void rxrpc_start_call_timer(struct rxrpc_call *call)
David Howells999b69f2016-06-17 15:42:35 +0100194{
David Howells248f2192016-09-08 11:10:12 +0100195 unsigned long expire_at;
David Howells999b69f2016-06-17 15:42:35 +0100196
David Howells248f2192016-09-08 11:10:12 +0100197 expire_at = jiffies + rxrpc_max_call_lifetime;
198 call->expire_at = expire_at;
199 call->ack_at = expire_at;
200 call->resend_at = expire_at;
201 call->timer.expires = expire_at;
202 add_timer(&call->timer);
David Howells17926a72007-04-26 15:48:28 -0700203}
204
205/*
206 * set up a call for the given data
207 * - called in process context with IRQs enabled
208 */
David Howells2341e072016-06-09 23:02:51 +0100209struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
David Howells19ffa012016-04-04 14:00:36 +0100210 struct rxrpc_conn_parameters *cp,
David Howells999b69f2016-06-17 15:42:35 +0100211 struct sockaddr_rxrpc *srx,
David Howells17926a72007-04-26 15:48:28 -0700212 unsigned long user_call_ID,
David Howells17926a72007-04-26 15:48:28 -0700213 gfp_t gfp)
214{
David Howells2341e072016-06-09 23:02:51 +0100215 struct rxrpc_call *call, *xcall;
216 struct rb_node *parent, **pp;
David Howellse34d4232016-08-30 09:49:29 +0100217 const void *here = __builtin_return_address(0);
David Howells999b69f2016-06-17 15:42:35 +0100218 int ret;
David Howells17926a72007-04-26 15:48:28 -0700219
David Howells999b69f2016-06-17 15:42:35 +0100220 _enter("%p,%lx", rx, user_call_ID);
David Howells17926a72007-04-26 15:48:28 -0700221
David Howells248f2192016-09-08 11:10:12 +0100222 call = rxrpc_alloc_client_call(srx, gfp);
David Howells2341e072016-06-09 23:02:51 +0100223 if (IS_ERR(call)) {
224 _leave(" = %ld", PTR_ERR(call));
225 return call;
David Howells17926a72007-04-26 15:48:28 -0700226 }
227
David Howellsa84a46d2016-09-17 10:49:14 +0100228 trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
229 here, (const void *)user_call_ID);
David Howellse34d4232016-08-30 09:49:29 +0100230
David Howells999b69f2016-06-17 15:42:35 +0100231 /* Publish the call, even though it is incompletely set up as yet */
David Howells17926a72007-04-26 15:48:28 -0700232 write_lock(&rx->call_lock);
233
234 pp = &rx->calls.rb_node;
235 parent = NULL;
236 while (*pp) {
237 parent = *pp;
David Howells2341e072016-06-09 23:02:51 +0100238 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
David Howells17926a72007-04-26 15:48:28 -0700239
David Howells2341e072016-06-09 23:02:51 +0100240 if (user_call_ID < xcall->user_call_ID)
David Howells17926a72007-04-26 15:48:28 -0700241 pp = &(*pp)->rb_left;
David Howells2341e072016-06-09 23:02:51 +0100242 else if (user_call_ID > xcall->user_call_ID)
David Howells17926a72007-04-26 15:48:28 -0700243 pp = &(*pp)->rb_right;
244 else
David Howells357f5ef2016-09-17 10:49:12 +0100245 goto error_dup_user_ID;
David Howells17926a72007-04-26 15:48:28 -0700246 }
247
David Howells248f2192016-09-08 11:10:12 +0100248 rcu_assign_pointer(call->socket, rx);
David Howells357f5ef2016-09-17 10:49:12 +0100249 call->user_call_ID = user_call_ID;
250 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
David Howellsfff72422016-09-07 14:34:21 +0100251 rxrpc_get_call(call, rxrpc_call_got_userid);
David Howells17926a72007-04-26 15:48:28 -0700252 rb_link_node(&call->sock_node, parent, pp);
253 rb_insert_color(&call->sock_node, &rx->calls);
David Howells248f2192016-09-08 11:10:12 +0100254 list_add(&call->sock_link, &rx->sock_calls);
255
David Howells17926a72007-04-26 15:48:28 -0700256 write_unlock(&rx->call_lock);
257
David Howells248f2192016-09-08 11:10:12 +0100258 write_lock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700259 list_add_tail(&call->link, &rxrpc_calls);
David Howells248f2192016-09-08 11:10:12 +0100260 write_unlock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700261
David Howells248f2192016-09-08 11:10:12 +0100262 /* Set up or get a connection record and set the protocol parameters,
263 * including channel number and call ID.
264 */
265 ret = rxrpc_connect_call(call, cp, srx, gfp);
David Howells999b69f2016-06-17 15:42:35 +0100266 if (ret < 0)
267 goto error;
268
David Howellsa84a46d2016-09-17 10:49:14 +0100269 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
270 here, ERR_PTR(ret));
271
David Howells248f2192016-09-08 11:10:12 +0100272 spin_lock_bh(&call->conn->params.peer->lock);
273 hlist_add_head(&call->error_link,
274 &call->conn->params.peer->error_targets);
275 spin_unlock_bh(&call->conn->params.peer->lock);
276
277 rxrpc_start_call_timer(call);
278
David Howells17926a72007-04-26 15:48:28 -0700279 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
280
281 _leave(" = %p [new]", call);
282 return call;
283
David Howells2341e072016-06-09 23:02:51 +0100284 /* We unexpectedly found the user ID in the list after taking
285 * the call_lock. This shouldn't happen unless the user races
286 * with itself and tries to add the same user ID twice at the
287 * same time in different threads.
288 */
David Howells357f5ef2016-09-17 10:49:12 +0100289error_dup_user_ID:
David Howells17926a72007-04-26 15:48:28 -0700290 write_unlock(&rx->call_lock);
David Howells8d94aa32016-09-07 09:19:31 +0100291 ret = -EEXIST;
David Howells357f5ef2016-09-17 10:49:12 +0100292
293error:
294 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
295 RX_CALL_DEAD, ret);
David Howellsa84a46d2016-09-17 10:49:14 +0100296 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
297 here, ERR_PTR(ret));
David Howells357f5ef2016-09-17 10:49:12 +0100298 rxrpc_release_call(rx, call);
299 rxrpc_put_call(call, rxrpc_call_put);
300 _leave(" = %d", ret);
301 return ERR_PTR(ret);
David Howells17926a72007-04-26 15:48:28 -0700302}
303
304/*
David Howells248f2192016-09-08 11:10:12 +0100305 * Set up an incoming call. call->conn points to the connection.
306 * This is called in BH context and isn't allowed to fail.
David Howells17926a72007-04-26 15:48:28 -0700307 */
David Howells248f2192016-09-08 11:10:12 +0100308void rxrpc_incoming_call(struct rxrpc_sock *rx,
309 struct rxrpc_call *call,
310 struct sk_buff *skb)
David Howells17926a72007-04-26 15:48:28 -0700311{
David Howells248f2192016-09-08 11:10:12 +0100312 struct rxrpc_connection *conn = call->conn;
David Howells42886ff2016-06-16 13:31:07 +0100313 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
David Howells248f2192016-09-08 11:10:12 +0100314 u32 chan;
David Howells17926a72007-04-26 15:48:28 -0700315
David Howells248f2192016-09-08 11:10:12 +0100316 _enter(",%d", call->conn->debug_id);
David Howells17926a72007-04-26 15:48:28 -0700317
David Howells248f2192016-09-08 11:10:12 +0100318 rcu_assign_pointer(call->socket, rx);
319 call->call_id = sp->hdr.callNumber;
320 call->service_id = sp->hdr.serviceId;
321 call->cid = sp->hdr.cid;
322 call->state = RXRPC_CALL_SERVER_ACCEPTING;
323 if (sp->hdr.securityIndex > 0)
324 call->state = RXRPC_CALL_SERVER_SECURING;
David Howells17926a72007-04-26 15:48:28 -0700325
David Howells248f2192016-09-08 11:10:12 +0100326 /* Set the channel for this call. We don't get channel_lock as we're
327 * only defending against the data_ready handler (which we're called
328 * from) and the RESPONSE packet parser (which is only really
329 * interested in call_counter and can cope with a disagreement with the
330 * call pointer).
David Howellsa1399f82016-06-27 14:39:44 +0100331 */
David Howells248f2192016-09-08 11:10:12 +0100332 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
333 conn->channels[chan].call_counter = call->call_id;
334 conn->channels[chan].call_id = call->call_id;
David Howellsa1399f82016-06-27 14:39:44 +0100335 rcu_assign_pointer(conn->channels[chan].call, call);
David Howells17926a72007-04-26 15:48:28 -0700336
David Howells85f32272016-04-04 14:00:36 +0100337 spin_lock(&conn->params.peer->lock);
338 hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
339 spin_unlock(&conn->params.peer->lock);
David Howells17926a72007-04-26 15:48:28 -0700340
David Howells17926a72007-04-26 15:48:28 -0700341 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
342
David Howells248f2192016-09-08 11:10:12 +0100343 rxrpc_start_call_timer(call);
344 _leave("");
David Howells17926a72007-04-26 15:48:28 -0700345}
346
347/*
David Howells8d94aa32016-09-07 09:19:31 +0100348 * Queue a call's work processor, getting a ref to pass to the work queue.
349 */
350bool rxrpc_queue_call(struct rxrpc_call *call)
351{
352 const void *here = __builtin_return_address(0);
353 int n = __atomic_add_unless(&call->usage, 1, 0);
David Howells8d94aa32016-09-07 09:19:31 +0100354 if (n == 0)
355 return false;
356 if (rxrpc_queue_work(&call->processor))
David Howells2ab27212016-09-08 11:10:12 +0100357 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL);
David Howells8d94aa32016-09-07 09:19:31 +0100358 else
359 rxrpc_put_call(call, rxrpc_call_put_noqueue);
360 return true;
361}
362
363/*
364 * Queue a call's work processor, passing the callers ref to the work queue.
365 */
366bool __rxrpc_queue_call(struct rxrpc_call *call)
367{
368 const void *here = __builtin_return_address(0);
369 int n = atomic_read(&call->usage);
David Howells8d94aa32016-09-07 09:19:31 +0100370 ASSERTCMP(n, >=, 1);
371 if (rxrpc_queue_work(&call->processor))
David Howells2ab27212016-09-08 11:10:12 +0100372 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL);
David Howells8d94aa32016-09-07 09:19:31 +0100373 else
374 rxrpc_put_call(call, rxrpc_call_put_noqueue);
375 return true;
376}
377
378/*
David Howellse34d4232016-08-30 09:49:29 +0100379 * Note the re-emergence of a call.
380 */
381void rxrpc_see_call(struct rxrpc_call *call)
382{
383 const void *here = __builtin_return_address(0);
384 if (call) {
385 int n = atomic_read(&call->usage);
David Howellse34d4232016-08-30 09:49:29 +0100386
David Howells2ab27212016-09-08 11:10:12 +0100387 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL);
David Howellse34d4232016-08-30 09:49:29 +0100388 }
389}
390
391/*
392 * Note the addition of a ref on a call.
393 */
David Howellsfff72422016-09-07 14:34:21 +0100394void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
David Howellse34d4232016-08-30 09:49:29 +0100395{
396 const void *here = __builtin_return_address(0);
397 int n = atomic_inc_return(&call->usage);
David Howellse34d4232016-08-30 09:49:29 +0100398
David Howells2ab27212016-09-08 11:10:12 +0100399 trace_rxrpc_call(call, op, n, here, NULL);
David Howellse34d4232016-08-30 09:49:29 +0100400}
401
402/*
David Howells248f2192016-09-08 11:10:12 +0100403 * Detach a call from its owning socket.
David Howells17926a72007-04-26 15:48:28 -0700404 */
David Howells8d94aa32016-09-07 09:19:31 +0100405void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
David Howells17926a72007-04-26 15:48:28 -0700406{
David Howellsa84a46d2016-09-17 10:49:14 +0100407 const void *here = __builtin_return_address(0);
David Howells248f2192016-09-08 11:10:12 +0100408 struct rxrpc_connection *conn = call->conn;
409 bool put = false;
410 int i;
411
412 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
413
David Howellsa84a46d2016-09-17 10:49:14 +0100414 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
415 here, (const void *)call->flags);
David Howells17926a72007-04-26 15:48:28 -0700416
David Howellsa84a46d2016-09-17 10:49:14 +0100417 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
David Howellse34d4232016-08-30 09:49:29 +0100418
David Howells17926a72007-04-26 15:48:28 -0700419 spin_lock_bh(&call->lock);
420 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
421 BUG();
422 spin_unlock_bh(&call->lock);
423
David Howells248f2192016-09-08 11:10:12 +0100424 del_timer_sync(&call->timer);
David Howells17926a72007-04-26 15:48:28 -0700425
David Howells248f2192016-09-08 11:10:12 +0100426 /* Make sure we don't get any more notifications */
427 write_lock_bh(&rx->recvmsg_lock);
David Howellse653cfe2016-04-04 14:00:38 +0100428
David Howells248f2192016-09-08 11:10:12 +0100429 if (!list_empty(&call->recvmsg_link)) {
David Howells17926a72007-04-26 15:48:28 -0700430 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
431 call, call->events, call->flags);
David Howells248f2192016-09-08 11:10:12 +0100432 list_del(&call->recvmsg_link);
433 put = true;
434 }
435
436 /* list_empty() must return false in rxrpc_notify_socket() */
437 call->recvmsg_link.next = NULL;
438 call->recvmsg_link.prev = NULL;
439
440 write_unlock_bh(&rx->recvmsg_lock);
441 if (put)
442 rxrpc_put_call(call, rxrpc_call_put);
443
444 write_lock(&rx->call_lock);
445
446 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
David Howells17926a72007-04-26 15:48:28 -0700447 rb_erase(&call->sock_node, &rx->calls);
448 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
David Howells8d94aa32016-09-07 09:19:31 +0100449 rxrpc_put_call(call, rxrpc_call_put_userid);
David Howells17926a72007-04-26 15:48:28 -0700450 }
David Howells17926a72007-04-26 15:48:28 -0700451
David Howells248f2192016-09-08 11:10:12 +0100452 list_del(&call->sock_link);
453 write_unlock(&rx->call_lock);
David Howells651350d2007-04-26 15:50:17 -0700454
David Howells248f2192016-09-08 11:10:12 +0100455 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
David Howells8d94aa32016-09-07 09:19:31 +0100456
David Howells248f2192016-09-08 11:10:12 +0100457 if (conn)
David Howells8d94aa32016-09-07 09:19:31 +0100458 rxrpc_disconnect_call(call);
David Howellse653cfe2016-04-04 14:00:38 +0100459
David Howells248f2192016-09-08 11:10:12 +0100460 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
461 rxrpc_free_skb(call->rxtx_buffer[i]);
462 call->rxtx_buffer[i] = NULL;
David Howells17926a72007-04-26 15:48:28 -0700463 }
David Howells17926a72007-04-26 15:48:28 -0700464
465 _leave("");
466}
467
468/*
David Howells17926a72007-04-26 15:48:28 -0700469 * release all the calls associated with a socket
470 */
471void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
472{
473 struct rxrpc_call *call;
David Howells17926a72007-04-26 15:48:28 -0700474
475 _enter("%p", rx);
476
David Howells0360da62016-09-17 10:49:11 +0100477 while (!list_empty(&rx->to_be_accepted)) {
478 call = list_entry(rx->to_be_accepted.next,
479 struct rxrpc_call, accept_link);
480 list_del(&call->accept_link);
481 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET);
482 rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
483 rxrpc_release_call(rx, call);
484 rxrpc_put_call(call, rxrpc_call_put);
485 }
486
David Howells248f2192016-09-08 11:10:12 +0100487 while (!list_empty(&rx->sock_calls)) {
488 call = list_entry(rx->sock_calls.next,
489 struct rxrpc_call, sock_link);
490 rxrpc_get_call(call, rxrpc_call_got);
491 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET);
492 rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
David Howells8d94aa32016-09-07 09:19:31 +0100493 rxrpc_release_call(rx, call);
David Howells248f2192016-09-08 11:10:12 +0100494 rxrpc_put_call(call, rxrpc_call_put);
David Howells17926a72007-04-26 15:48:28 -0700495 }
496
David Howells17926a72007-04-26 15:48:28 -0700497 _leave("");
498}
499
500/*
501 * release a call
502 */
David Howellsfff72422016-09-07 14:34:21 +0100503void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
David Howells17926a72007-04-26 15:48:28 -0700504{
David Howellse34d4232016-08-30 09:49:29 +0100505 const void *here = __builtin_return_address(0);
David Howells2ab27212016-09-08 11:10:12 +0100506 int n;
David Howellse34d4232016-08-30 09:49:29 +0100507
David Howells17926a72007-04-26 15:48:28 -0700508 ASSERT(call != NULL);
509
David Howellse34d4232016-08-30 09:49:29 +0100510 n = atomic_dec_return(&call->usage);
David Howells2ab27212016-09-08 11:10:12 +0100511 trace_rxrpc_call(call, op, n, here, NULL);
David Howellse34d4232016-08-30 09:49:29 +0100512 ASSERTCMP(n, >=, 0);
513 if (n == 0) {
David Howells17926a72007-04-26 15:48:28 -0700514 _debug("call %d dead", call->debug_id);
David Howells248f2192016-09-08 11:10:12 +0100515 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
David Howellse34d4232016-08-30 09:49:29 +0100516
David Howells248f2192016-09-08 11:10:12 +0100517 write_lock(&rxrpc_call_lock);
518 list_del_init(&call->link);
519 write_unlock(&rxrpc_call_lock);
David Howellse34d4232016-08-30 09:49:29 +0100520
David Howells8d94aa32016-09-07 09:19:31 +0100521 rxrpc_cleanup_call(call);
David Howellse34d4232016-08-30 09:49:29 +0100522 }
David Howells17926a72007-04-26 15:48:28 -0700523}
524
525/*
David Howellsdee46362016-06-27 17:11:19 +0100526 * Final call destruction under RCU.
527 */
528static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
529{
530 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
531
David Howellsdf5d8bf2016-08-24 14:31:43 +0100532 rxrpc_put_peer(call->peer);
David Howells248f2192016-09-08 11:10:12 +0100533 kfree(call->rxtx_buffer);
534 kfree(call->rxtx_annotations);
David Howellsdee46362016-06-27 17:11:19 +0100535 kmem_cache_free(rxrpc_call_jar, call);
536}
537
538/*
David Howells17926a72007-04-26 15:48:28 -0700539 * clean up a call
540 */
David Howells00e90712016-09-08 11:10:12 +0100541void rxrpc_cleanup_call(struct rxrpc_call *call)
David Howells17926a72007-04-26 15:48:28 -0700542{
David Howells248f2192016-09-08 11:10:12 +0100543 int i;
David Howells17926a72007-04-26 15:48:28 -0700544
David Howells248f2192016-09-08 11:10:12 +0100545 _net("DESTROY CALL %d", call->debug_id);
David Howells17926a72007-04-26 15:48:28 -0700546
547 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
548
David Howells248f2192016-09-08 11:10:12 +0100549 del_timer_sync(&call->timer);
David Howells17926a72007-04-26 15:48:28 -0700550
David Howells8d94aa32016-09-07 09:19:31 +0100551 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
David Howells17926a72007-04-26 15:48:28 -0700552 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
David Howellse653cfe2016-04-04 14:00:38 +0100553 ASSERTCMP(call->conn, ==, NULL);
David Howells17926a72007-04-26 15:48:28 -0700554
David Howells248f2192016-09-08 11:10:12 +0100555 /* Clean up the Rx/Tx buffer */
556 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++)
557 rxrpc_free_skb(call->rxtx_buffer[i]);
David Howells17926a72007-04-26 15:48:28 -0700558
559 rxrpc_free_skb(call->tx_pending);
560
David Howellsdee46362016-06-27 17:11:19 +0100561 call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
David Howells17926a72007-04-26 15:48:28 -0700562}
563
564/*
David Howells8d94aa32016-09-07 09:19:31 +0100565 * Make sure that all calls are gone.
David Howells17926a72007-04-26 15:48:28 -0700566 */
567void __exit rxrpc_destroy_all_calls(void)
568{
569 struct rxrpc_call *call;
570
571 _enter("");
David Howells8d94aa32016-09-07 09:19:31 +0100572
573 if (list_empty(&rxrpc_calls))
574 return;
David Howells248f2192016-09-08 11:10:12 +0100575
576 write_lock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700577
578 while (!list_empty(&rxrpc_calls)) {
579 call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
580 _debug("Zapping call %p", call);
581
David Howellse34d4232016-08-30 09:49:29 +0100582 rxrpc_see_call(call);
David Howells17926a72007-04-26 15:48:28 -0700583 list_del_init(&call->link);
584
David Howells248f2192016-09-08 11:10:12 +0100585 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
David Howells8d94aa32016-09-07 09:19:31 +0100586 call, atomic_read(&call->usage),
David Howells8d94aa32016-09-07 09:19:31 +0100587 rxrpc_call_states[call->state],
588 call->flags, call->events);
David Howells17926a72007-04-26 15:48:28 -0700589
David Howells248f2192016-09-08 11:10:12 +0100590 write_unlock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700591 cond_resched();
David Howells248f2192016-09-08 11:10:12 +0100592 write_lock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700593 }
594
David Howells248f2192016-09-08 11:10:12 +0100595 write_unlock(&rxrpc_call_lock);
David Howells17926a72007-04-26 15:48:28 -0700596}