David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1 | /* RxRPC virtual connection handler |
| 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 Perches | 9b6d539 | 2016-06-02 12:08:52 -0700 | [diff] [blame^] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 13 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 16 | #include <linux/net.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/crypto.h> |
| 19 | #include <net/sock.h> |
| 20 | #include <net/af_rxrpc.h> |
| 21 | #include "ar-internal.h" |
| 22 | |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 23 | /* |
| 24 | * Time till a connection expires after last use (in seconds). |
| 25 | */ |
David Howells | dad8aff | 2016-03-09 23:22:56 +0000 | [diff] [blame] | 26 | unsigned int rxrpc_connection_expiry = 10 * 60; |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 27 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 28 | static void rxrpc_connection_reaper(struct work_struct *work); |
| 29 | |
| 30 | LIST_HEAD(rxrpc_connections); |
| 31 | DEFINE_RWLOCK(rxrpc_connection_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 32 | static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper); |
| 33 | |
| 34 | /* |
| 35 | * allocate a new client connection bundle |
| 36 | */ |
| 37 | static struct rxrpc_conn_bundle *rxrpc_alloc_bundle(gfp_t gfp) |
| 38 | { |
| 39 | struct rxrpc_conn_bundle *bundle; |
| 40 | |
| 41 | _enter(""); |
| 42 | |
| 43 | bundle = kzalloc(sizeof(struct rxrpc_conn_bundle), gfp); |
| 44 | if (bundle) { |
| 45 | INIT_LIST_HEAD(&bundle->unused_conns); |
| 46 | INIT_LIST_HEAD(&bundle->avail_conns); |
| 47 | INIT_LIST_HEAD(&bundle->busy_conns); |
| 48 | init_waitqueue_head(&bundle->chanwait); |
| 49 | atomic_set(&bundle->usage, 1); |
| 50 | } |
| 51 | |
| 52 | _leave(" = %p", bundle); |
| 53 | return bundle; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * compare bundle parameters with what we're looking for |
| 58 | * - return -ve, 0 or +ve |
| 59 | */ |
| 60 | static inline |
| 61 | int rxrpc_cmp_bundle(const struct rxrpc_conn_bundle *bundle, |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 62 | struct key *key, u16 service_id) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 63 | { |
| 64 | return (bundle->service_id - service_id) ?: |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 65 | ((unsigned long)bundle->key - (unsigned long)key); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | /* |
| 69 | * get bundle of client connections that a client socket can make use of |
| 70 | */ |
| 71 | struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *rx, |
| 72 | struct rxrpc_transport *trans, |
| 73 | struct key *key, |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 74 | u16 service_id, |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 75 | gfp_t gfp) |
| 76 | { |
| 77 | struct rxrpc_conn_bundle *bundle, *candidate; |
| 78 | struct rb_node *p, *parent, **pp; |
| 79 | |
| 80 | _enter("%p{%x},%x,%hx,", |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 81 | rx, key_serial(key), trans->debug_id, service_id); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 82 | |
| 83 | if (rx->trans == trans && rx->bundle) { |
| 84 | atomic_inc(&rx->bundle->usage); |
| 85 | return rx->bundle; |
| 86 | } |
| 87 | |
| 88 | /* search the extant bundles first for one that matches the specified |
| 89 | * user ID */ |
| 90 | spin_lock(&trans->client_lock); |
| 91 | |
| 92 | p = trans->bundles.rb_node; |
| 93 | while (p) { |
| 94 | bundle = rb_entry(p, struct rxrpc_conn_bundle, node); |
| 95 | |
| 96 | if (rxrpc_cmp_bundle(bundle, key, service_id) < 0) |
| 97 | p = p->rb_left; |
| 98 | else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0) |
| 99 | p = p->rb_right; |
| 100 | else |
| 101 | goto found_extant_bundle; |
| 102 | } |
| 103 | |
| 104 | spin_unlock(&trans->client_lock); |
| 105 | |
| 106 | /* not yet present - create a candidate for a new record and then |
| 107 | * redo the search */ |
| 108 | candidate = rxrpc_alloc_bundle(gfp); |
| 109 | if (!candidate) { |
| 110 | _leave(" = -ENOMEM"); |
| 111 | return ERR_PTR(-ENOMEM); |
| 112 | } |
| 113 | |
| 114 | candidate->key = key_get(key); |
| 115 | candidate->service_id = service_id; |
| 116 | |
| 117 | spin_lock(&trans->client_lock); |
| 118 | |
| 119 | pp = &trans->bundles.rb_node; |
| 120 | parent = NULL; |
| 121 | while (*pp) { |
| 122 | parent = *pp; |
| 123 | bundle = rb_entry(parent, struct rxrpc_conn_bundle, node); |
| 124 | |
| 125 | if (rxrpc_cmp_bundle(bundle, key, service_id) < 0) |
| 126 | pp = &(*pp)->rb_left; |
| 127 | else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0) |
| 128 | pp = &(*pp)->rb_right; |
| 129 | else |
| 130 | goto found_extant_second; |
| 131 | } |
| 132 | |
| 133 | /* second search also failed; add the new bundle */ |
| 134 | bundle = candidate; |
| 135 | candidate = NULL; |
| 136 | |
| 137 | rb_link_node(&bundle->node, parent, pp); |
| 138 | rb_insert_color(&bundle->node, &trans->bundles); |
| 139 | spin_unlock(&trans->client_lock); |
| 140 | _net("BUNDLE new on trans %d", trans->debug_id); |
| 141 | if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) { |
| 142 | atomic_inc(&bundle->usage); |
| 143 | rx->bundle = bundle; |
| 144 | } |
| 145 | _leave(" = %p [new]", bundle); |
| 146 | return bundle; |
| 147 | |
| 148 | /* we found the bundle in the list immediately */ |
| 149 | found_extant_bundle: |
| 150 | atomic_inc(&bundle->usage); |
| 151 | spin_unlock(&trans->client_lock); |
| 152 | _net("BUNDLE old on trans %d", trans->debug_id); |
| 153 | if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) { |
| 154 | atomic_inc(&bundle->usage); |
| 155 | rx->bundle = bundle; |
| 156 | } |
| 157 | _leave(" = %p [extant %d]", bundle, atomic_read(&bundle->usage)); |
| 158 | return bundle; |
| 159 | |
| 160 | /* we found the bundle on the second time through the list */ |
| 161 | found_extant_second: |
| 162 | atomic_inc(&bundle->usage); |
| 163 | spin_unlock(&trans->client_lock); |
| 164 | kfree(candidate); |
| 165 | _net("BUNDLE old2 on trans %d", trans->debug_id); |
| 166 | if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) { |
| 167 | atomic_inc(&bundle->usage); |
| 168 | rx->bundle = bundle; |
| 169 | } |
| 170 | _leave(" = %p [second %d]", bundle, atomic_read(&bundle->usage)); |
| 171 | return bundle; |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * release a bundle |
| 176 | */ |
| 177 | void rxrpc_put_bundle(struct rxrpc_transport *trans, |
| 178 | struct rxrpc_conn_bundle *bundle) |
| 179 | { |
| 180 | _enter("%p,%p{%d}",trans, bundle, atomic_read(&bundle->usage)); |
| 181 | |
| 182 | if (atomic_dec_and_lock(&bundle->usage, &trans->client_lock)) { |
| 183 | _debug("Destroy bundle"); |
| 184 | rb_erase(&bundle->node, &trans->bundles); |
| 185 | spin_unlock(&trans->client_lock); |
| 186 | ASSERT(list_empty(&bundle->unused_conns)); |
| 187 | ASSERT(list_empty(&bundle->avail_conns)); |
| 188 | ASSERT(list_empty(&bundle->busy_conns)); |
| 189 | ASSERTCMP(bundle->num_conns, ==, 0); |
| 190 | key_put(bundle->key); |
| 191 | kfree(bundle); |
| 192 | } |
| 193 | |
| 194 | _leave(""); |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * allocate a new connection |
| 199 | */ |
| 200 | static struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp) |
| 201 | { |
| 202 | struct rxrpc_connection *conn; |
| 203 | |
| 204 | _enter(""); |
| 205 | |
| 206 | conn = kzalloc(sizeof(struct rxrpc_connection), gfp); |
| 207 | if (conn) { |
| 208 | INIT_WORK(&conn->processor, &rxrpc_process_connection); |
| 209 | INIT_LIST_HEAD(&conn->bundle_link); |
| 210 | conn->calls = RB_ROOT; |
| 211 | skb_queue_head_init(&conn->rx_queue); |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 212 | conn->security = &rxrpc_no_security; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 213 | rwlock_init(&conn->lock); |
| 214 | spin_lock_init(&conn->state_lock); |
| 215 | atomic_set(&conn->usage, 1); |
| 216 | conn->debug_id = atomic_inc_return(&rxrpc_debug_id); |
| 217 | conn->avail_calls = RXRPC_MAXCALLS; |
| 218 | conn->size_align = 4; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 219 | conn->header_size = sizeof(struct rxrpc_wire_header); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Adrian Bunk | 16c61ad | 2007-06-15 15:15:43 -0700 | [diff] [blame] | 222 | _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 223 | return conn; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * assign a connection ID to a connection and add it to the transport's |
| 228 | * connection lookup tree |
| 229 | * - called with transport client lock held |
| 230 | */ |
| 231 | static void rxrpc_assign_connection_id(struct rxrpc_connection *conn) |
| 232 | { |
| 233 | struct rxrpc_connection *xconn; |
| 234 | struct rb_node *parent, **p; |
| 235 | __be32 epoch; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 236 | u32 cid; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 237 | |
| 238 | _enter(""); |
| 239 | |
| 240 | epoch = conn->epoch; |
| 241 | |
| 242 | write_lock_bh(&conn->trans->conn_lock); |
| 243 | |
| 244 | conn->trans->conn_idcounter += RXRPC_CID_INC; |
| 245 | if (conn->trans->conn_idcounter < RXRPC_CID_INC) |
| 246 | conn->trans->conn_idcounter = RXRPC_CID_INC; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 247 | cid = conn->trans->conn_idcounter; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 248 | |
| 249 | attempt_insertion: |
| 250 | parent = NULL; |
| 251 | p = &conn->trans->client_conns.rb_node; |
| 252 | |
| 253 | while (*p) { |
| 254 | parent = *p; |
| 255 | xconn = rb_entry(parent, struct rxrpc_connection, node); |
| 256 | |
| 257 | if (epoch < xconn->epoch) |
| 258 | p = &(*p)->rb_left; |
| 259 | else if (epoch > xconn->epoch) |
| 260 | p = &(*p)->rb_right; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 261 | else if (cid < xconn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 262 | p = &(*p)->rb_left; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 263 | else if (cid > xconn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 264 | p = &(*p)->rb_right; |
| 265 | else |
| 266 | goto id_exists; |
| 267 | } |
| 268 | |
| 269 | /* we've found a suitable hole - arrange for this connection to occupy |
| 270 | * it */ |
| 271 | rb_link_node(&conn->node, parent, p); |
| 272 | rb_insert_color(&conn->node, &conn->trans->client_conns); |
| 273 | |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 274 | conn->cid = cid; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 275 | write_unlock_bh(&conn->trans->conn_lock); |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 276 | _leave(" [CID %x]", cid); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 277 | return; |
| 278 | |
| 279 | /* we found a connection with the proposed ID - walk the tree from that |
| 280 | * point looking for the next unused ID */ |
| 281 | id_exists: |
| 282 | for (;;) { |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 283 | cid += RXRPC_CID_INC; |
| 284 | if (cid < RXRPC_CID_INC) { |
| 285 | cid = RXRPC_CID_INC; |
| 286 | conn->trans->conn_idcounter = cid; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 287 | goto attempt_insertion; |
| 288 | } |
| 289 | |
| 290 | parent = rb_next(parent); |
| 291 | if (!parent) |
| 292 | goto attempt_insertion; |
| 293 | |
| 294 | xconn = rb_entry(parent, struct rxrpc_connection, node); |
| 295 | if (epoch < xconn->epoch || |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 296 | cid < xconn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 297 | goto attempt_insertion; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * add a call to a connection's call-by-ID tree |
| 303 | */ |
| 304 | static void rxrpc_add_call_ID_to_conn(struct rxrpc_connection *conn, |
| 305 | struct rxrpc_call *call) |
| 306 | { |
| 307 | struct rxrpc_call *xcall; |
| 308 | struct rb_node *parent, **p; |
| 309 | __be32 call_id; |
| 310 | |
| 311 | write_lock_bh(&conn->lock); |
| 312 | |
| 313 | call_id = call->call_id; |
| 314 | p = &conn->calls.rb_node; |
| 315 | parent = NULL; |
| 316 | while (*p) { |
| 317 | parent = *p; |
| 318 | xcall = rb_entry(parent, struct rxrpc_call, conn_node); |
| 319 | |
| 320 | if (call_id < xcall->call_id) |
| 321 | p = &(*p)->rb_left; |
| 322 | else if (call_id > xcall->call_id) |
| 323 | p = &(*p)->rb_right; |
| 324 | else |
| 325 | BUG(); |
| 326 | } |
| 327 | |
| 328 | rb_link_node(&call->conn_node, parent, p); |
| 329 | rb_insert_color(&call->conn_node, &conn->calls); |
| 330 | |
| 331 | write_unlock_bh(&conn->lock); |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * connect a call on an exclusive connection |
| 336 | */ |
| 337 | static int rxrpc_connect_exclusive(struct rxrpc_sock *rx, |
| 338 | struct rxrpc_transport *trans, |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 339 | u16 service_id, |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 340 | struct rxrpc_call *call, |
| 341 | gfp_t gfp) |
| 342 | { |
| 343 | struct rxrpc_connection *conn; |
| 344 | int chan, ret; |
| 345 | |
| 346 | _enter(""); |
| 347 | |
| 348 | conn = rx->conn; |
| 349 | if (!conn) { |
| 350 | /* not yet present - create a candidate for a new connection |
| 351 | * and then redo the check */ |
| 352 | conn = rxrpc_alloc_connection(gfp); |
Dan Carpenter | 0975ecb | 2009-05-21 15:22:02 -0700 | [diff] [blame] | 353 | if (!conn) { |
| 354 | _leave(" = -ENOMEM"); |
| 355 | return -ENOMEM; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | conn->trans = trans; |
| 359 | conn->bundle = NULL; |
| 360 | conn->service_id = service_id; |
| 361 | conn->epoch = rxrpc_epoch; |
| 362 | conn->in_clientflag = 0; |
| 363 | conn->out_clientflag = RXRPC_CLIENT_INITIATED; |
| 364 | conn->cid = 0; |
| 365 | conn->state = RXRPC_CONN_CLIENT; |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 366 | conn->avail_calls = RXRPC_MAXCALLS - 1; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 367 | conn->security_level = rx->min_sec_level; |
| 368 | conn->key = key_get(rx->key); |
| 369 | |
| 370 | ret = rxrpc_init_client_conn_security(conn); |
| 371 | if (ret < 0) { |
| 372 | key_put(conn->key); |
| 373 | kfree(conn); |
| 374 | _leave(" = %d [key]", ret); |
| 375 | return ret; |
| 376 | } |
| 377 | |
| 378 | write_lock_bh(&rxrpc_connection_lock); |
| 379 | list_add_tail(&conn->link, &rxrpc_connections); |
| 380 | write_unlock_bh(&rxrpc_connection_lock); |
| 381 | |
| 382 | spin_lock(&trans->client_lock); |
| 383 | atomic_inc(&trans->usage); |
| 384 | |
| 385 | _net("CONNECT EXCL new %d on TRANS %d", |
| 386 | conn->debug_id, conn->trans->debug_id); |
| 387 | |
| 388 | rxrpc_assign_connection_id(conn); |
| 389 | rx->conn = conn; |
Alexey Khoroshilov | 8f22ba6 | 2014-01-26 11:39:26 +0000 | [diff] [blame] | 390 | } else { |
| 391 | spin_lock(&trans->client_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | /* we've got a connection with a free channel and we can now attach the |
| 395 | * call to it |
| 396 | * - we're holding the transport's client lock |
| 397 | * - we're holding a reference on the connection |
| 398 | */ |
| 399 | for (chan = 0; chan < RXRPC_MAXCALLS; chan++) |
| 400 | if (!conn->channels[chan]) |
| 401 | goto found_channel; |
| 402 | goto no_free_channels; |
| 403 | |
| 404 | found_channel: |
| 405 | atomic_inc(&conn->usage); |
| 406 | conn->channels[chan] = call; |
| 407 | call->conn = conn; |
| 408 | call->channel = chan; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 409 | call->cid = conn->cid | chan; |
| 410 | call->call_id = ++conn->call_counter; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 411 | |
| 412 | _net("CONNECT client on conn %d chan %d as call %x", |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 413 | conn->debug_id, chan, call->call_id); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 414 | |
| 415 | spin_unlock(&trans->client_lock); |
| 416 | |
| 417 | rxrpc_add_call_ID_to_conn(conn, call); |
| 418 | _leave(" = 0"); |
| 419 | return 0; |
| 420 | |
| 421 | no_free_channels: |
| 422 | spin_unlock(&trans->client_lock); |
| 423 | _leave(" = -ENOSR"); |
| 424 | return -ENOSR; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * find a connection for a call |
| 429 | * - called in process context with IRQs enabled |
| 430 | */ |
| 431 | int rxrpc_connect_call(struct rxrpc_sock *rx, |
| 432 | struct rxrpc_transport *trans, |
| 433 | struct rxrpc_conn_bundle *bundle, |
| 434 | struct rxrpc_call *call, |
| 435 | gfp_t gfp) |
| 436 | { |
| 437 | struct rxrpc_connection *conn, *candidate; |
| 438 | int chan, ret; |
| 439 | |
| 440 | DECLARE_WAITQUEUE(myself, current); |
| 441 | |
| 442 | _enter("%p,%lx,", rx, call->user_call_ID); |
| 443 | |
| 444 | if (test_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags)) |
| 445 | return rxrpc_connect_exclusive(rx, trans, bundle->service_id, |
| 446 | call, gfp); |
| 447 | |
| 448 | spin_lock(&trans->client_lock); |
| 449 | for (;;) { |
| 450 | /* see if the bundle has a call slot available */ |
| 451 | if (!list_empty(&bundle->avail_conns)) { |
| 452 | _debug("avail"); |
| 453 | conn = list_entry(bundle->avail_conns.next, |
| 454 | struct rxrpc_connection, |
| 455 | bundle_link); |
David Howells | 519d256 | 2009-06-16 21:36:44 +0100 | [diff] [blame] | 456 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
| 457 | list_del_init(&conn->bundle_link); |
| 458 | bundle->num_conns--; |
| 459 | continue; |
| 460 | } |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 461 | if (--conn->avail_calls == 0) |
| 462 | list_move(&conn->bundle_link, |
| 463 | &bundle->busy_conns); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 464 | ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS); |
| 465 | ASSERT(conn->channels[0] == NULL || |
| 466 | conn->channels[1] == NULL || |
| 467 | conn->channels[2] == NULL || |
| 468 | conn->channels[3] == NULL); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 469 | atomic_inc(&conn->usage); |
| 470 | break; |
| 471 | } |
| 472 | |
| 473 | if (!list_empty(&bundle->unused_conns)) { |
| 474 | _debug("unused"); |
| 475 | conn = list_entry(bundle->unused_conns.next, |
| 476 | struct rxrpc_connection, |
| 477 | bundle_link); |
David Howells | 519d256 | 2009-06-16 21:36:44 +0100 | [diff] [blame] | 478 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
| 479 | list_del_init(&conn->bundle_link); |
| 480 | bundle->num_conns--; |
| 481 | continue; |
| 482 | } |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 483 | ASSERTCMP(conn->avail_calls, ==, RXRPC_MAXCALLS); |
| 484 | conn->avail_calls = RXRPC_MAXCALLS - 1; |
| 485 | ASSERT(conn->channels[0] == NULL && |
| 486 | conn->channels[1] == NULL && |
| 487 | conn->channels[2] == NULL && |
| 488 | conn->channels[3] == NULL); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 489 | atomic_inc(&conn->usage); |
| 490 | list_move(&conn->bundle_link, &bundle->avail_conns); |
| 491 | break; |
| 492 | } |
| 493 | |
| 494 | /* need to allocate a new connection */ |
| 495 | _debug("get new conn [%d]", bundle->num_conns); |
| 496 | |
| 497 | spin_unlock(&trans->client_lock); |
| 498 | |
| 499 | if (signal_pending(current)) |
| 500 | goto interrupted; |
| 501 | |
| 502 | if (bundle->num_conns >= 20) { |
| 503 | _debug("too many conns"); |
| 504 | |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 505 | if (!gfpflags_allow_blocking(gfp)) { |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 506 | _leave(" = -EAGAIN"); |
| 507 | return -EAGAIN; |
| 508 | } |
| 509 | |
| 510 | add_wait_queue(&bundle->chanwait, &myself); |
| 511 | for (;;) { |
| 512 | set_current_state(TASK_INTERRUPTIBLE); |
| 513 | if (bundle->num_conns < 20 || |
| 514 | !list_empty(&bundle->unused_conns) || |
| 515 | !list_empty(&bundle->avail_conns)) |
| 516 | break; |
| 517 | if (signal_pending(current)) |
| 518 | goto interrupted_dequeue; |
| 519 | schedule(); |
| 520 | } |
| 521 | remove_wait_queue(&bundle->chanwait, &myself); |
| 522 | __set_current_state(TASK_RUNNING); |
| 523 | spin_lock(&trans->client_lock); |
| 524 | continue; |
| 525 | } |
| 526 | |
| 527 | /* not yet present - create a candidate for a new connection and then |
| 528 | * redo the check */ |
| 529 | candidate = rxrpc_alloc_connection(gfp); |
Dan Carpenter | 0975ecb | 2009-05-21 15:22:02 -0700 | [diff] [blame] | 530 | if (!candidate) { |
| 531 | _leave(" = -ENOMEM"); |
| 532 | return -ENOMEM; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | candidate->trans = trans; |
| 536 | candidate->bundle = bundle; |
| 537 | candidate->service_id = bundle->service_id; |
| 538 | candidate->epoch = rxrpc_epoch; |
| 539 | candidate->in_clientflag = 0; |
| 540 | candidate->out_clientflag = RXRPC_CLIENT_INITIATED; |
| 541 | candidate->cid = 0; |
| 542 | candidate->state = RXRPC_CONN_CLIENT; |
| 543 | candidate->avail_calls = RXRPC_MAXCALLS; |
| 544 | candidate->security_level = rx->min_sec_level; |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 545 | candidate->key = key_get(bundle->key); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 546 | |
| 547 | ret = rxrpc_init_client_conn_security(candidate); |
| 548 | if (ret < 0) { |
| 549 | key_put(candidate->key); |
| 550 | kfree(candidate); |
| 551 | _leave(" = %d [key]", ret); |
| 552 | return ret; |
| 553 | } |
| 554 | |
| 555 | write_lock_bh(&rxrpc_connection_lock); |
| 556 | list_add_tail(&candidate->link, &rxrpc_connections); |
| 557 | write_unlock_bh(&rxrpc_connection_lock); |
| 558 | |
| 559 | spin_lock(&trans->client_lock); |
| 560 | |
| 561 | list_add(&candidate->bundle_link, &bundle->unused_conns); |
| 562 | bundle->num_conns++; |
| 563 | atomic_inc(&bundle->usage); |
| 564 | atomic_inc(&trans->usage); |
| 565 | |
| 566 | _net("CONNECT new %d on TRANS %d", |
| 567 | candidate->debug_id, candidate->trans->debug_id); |
| 568 | |
| 569 | rxrpc_assign_connection_id(candidate); |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 570 | candidate->security->prime_packet_security(candidate); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 571 | |
| 572 | /* leave the candidate lurking in zombie mode attached to the |
| 573 | * bundle until we're ready for it */ |
| 574 | rxrpc_put_connection(candidate); |
| 575 | candidate = NULL; |
| 576 | } |
| 577 | |
| 578 | /* we've got a connection with a free channel and we can now attach the |
| 579 | * call to it |
| 580 | * - we're holding the transport's client lock |
| 581 | * - we're holding a reference on the connection |
| 582 | * - we're holding a reference on the bundle |
| 583 | */ |
| 584 | for (chan = 0; chan < RXRPC_MAXCALLS; chan++) |
| 585 | if (!conn->channels[chan]) |
| 586 | goto found_channel; |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 587 | ASSERT(conn->channels[0] == NULL || |
| 588 | conn->channels[1] == NULL || |
| 589 | conn->channels[2] == NULL || |
| 590 | conn->channels[3] == NULL); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 591 | BUG(); |
| 592 | |
| 593 | found_channel: |
| 594 | conn->channels[chan] = call; |
| 595 | call->conn = conn; |
| 596 | call->channel = chan; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 597 | call->cid = conn->cid | chan; |
| 598 | call->call_id = ++conn->call_counter; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 599 | |
| 600 | _net("CONNECT client on conn %d chan %d as call %x", |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 601 | conn->debug_id, chan, call->call_id); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 602 | |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 603 | ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 604 | spin_unlock(&trans->client_lock); |
| 605 | |
| 606 | rxrpc_add_call_ID_to_conn(conn, call); |
| 607 | |
| 608 | _leave(" = 0"); |
| 609 | return 0; |
| 610 | |
| 611 | interrupted_dequeue: |
| 612 | remove_wait_queue(&bundle->chanwait, &myself); |
| 613 | __set_current_state(TASK_RUNNING); |
| 614 | interrupted: |
| 615 | _leave(" = -ERESTARTSYS"); |
| 616 | return -ERESTARTSYS; |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * get a record of an incoming connection |
| 621 | */ |
| 622 | struct rxrpc_connection * |
| 623 | rxrpc_incoming_connection(struct rxrpc_transport *trans, |
David Howells | 843099c | 2016-04-07 17:23:37 +0100 | [diff] [blame] | 624 | struct rxrpc_host_header *hdr) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 625 | { |
| 626 | struct rxrpc_connection *conn, *candidate = NULL; |
| 627 | struct rb_node *p, **pp; |
| 628 | const char *new = "old"; |
| 629 | __be32 epoch; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 630 | u32 cid; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 631 | |
| 632 | _enter(""); |
| 633 | |
| 634 | ASSERT(hdr->flags & RXRPC_CLIENT_INITIATED); |
| 635 | |
| 636 | epoch = hdr->epoch; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 637 | cid = hdr->cid & RXRPC_CIDMASK; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 638 | |
| 639 | /* search the connection list first */ |
| 640 | read_lock_bh(&trans->conn_lock); |
| 641 | |
| 642 | p = trans->server_conns.rb_node; |
| 643 | while (p) { |
| 644 | conn = rb_entry(p, struct rxrpc_connection, node); |
| 645 | |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 646 | _debug("maybe %x", conn->cid); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 647 | |
| 648 | if (epoch < conn->epoch) |
| 649 | p = p->rb_left; |
| 650 | else if (epoch > conn->epoch) |
| 651 | p = p->rb_right; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 652 | else if (cid < conn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 653 | p = p->rb_left; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 654 | else if (cid > conn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 655 | p = p->rb_right; |
| 656 | else |
| 657 | goto found_extant_connection; |
| 658 | } |
| 659 | read_unlock_bh(&trans->conn_lock); |
| 660 | |
| 661 | /* not yet present - create a candidate for a new record and then |
| 662 | * redo the search */ |
David Howells | 843099c | 2016-04-07 17:23:37 +0100 | [diff] [blame] | 663 | candidate = rxrpc_alloc_connection(GFP_NOIO); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 664 | if (!candidate) { |
| 665 | _leave(" = -ENOMEM"); |
| 666 | return ERR_PTR(-ENOMEM); |
| 667 | } |
| 668 | |
| 669 | candidate->trans = trans; |
| 670 | candidate->epoch = hdr->epoch; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 671 | candidate->cid = hdr->cid & RXRPC_CIDMASK; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 672 | candidate->service_id = hdr->serviceId; |
| 673 | candidate->security_ix = hdr->securityIndex; |
| 674 | candidate->in_clientflag = RXRPC_CLIENT_INITIATED; |
| 675 | candidate->out_clientflag = 0; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 676 | candidate->state = RXRPC_CONN_SERVER; |
| 677 | if (candidate->service_id) |
| 678 | candidate->state = RXRPC_CONN_SERVER_UNSECURED; |
| 679 | |
| 680 | write_lock_bh(&trans->conn_lock); |
| 681 | |
| 682 | pp = &trans->server_conns.rb_node; |
| 683 | p = NULL; |
| 684 | while (*pp) { |
| 685 | p = *pp; |
| 686 | conn = rb_entry(p, struct rxrpc_connection, node); |
| 687 | |
| 688 | if (epoch < conn->epoch) |
| 689 | pp = &(*pp)->rb_left; |
| 690 | else if (epoch > conn->epoch) |
| 691 | pp = &(*pp)->rb_right; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 692 | else if (cid < conn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 693 | pp = &(*pp)->rb_left; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 694 | else if (cid > conn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 695 | pp = &(*pp)->rb_right; |
| 696 | else |
| 697 | goto found_extant_second; |
| 698 | } |
| 699 | |
| 700 | /* we can now add the new candidate to the list */ |
| 701 | conn = candidate; |
| 702 | candidate = NULL; |
| 703 | rb_link_node(&conn->node, p, pp); |
| 704 | rb_insert_color(&conn->node, &trans->server_conns); |
| 705 | atomic_inc(&conn->trans->usage); |
| 706 | |
| 707 | write_unlock_bh(&trans->conn_lock); |
| 708 | |
| 709 | write_lock_bh(&rxrpc_connection_lock); |
| 710 | list_add_tail(&conn->link, &rxrpc_connections); |
| 711 | write_unlock_bh(&rxrpc_connection_lock); |
| 712 | |
| 713 | new = "new"; |
| 714 | |
| 715 | success: |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 716 | _net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->cid); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 717 | |
| 718 | _leave(" = %p {u=%d}", conn, atomic_read(&conn->usage)); |
| 719 | return conn; |
| 720 | |
| 721 | /* we found the connection in the list immediately */ |
| 722 | found_extant_connection: |
| 723 | if (hdr->securityIndex != conn->security_ix) { |
| 724 | read_unlock_bh(&trans->conn_lock); |
| 725 | goto security_mismatch; |
| 726 | } |
| 727 | atomic_inc(&conn->usage); |
| 728 | read_unlock_bh(&trans->conn_lock); |
| 729 | goto success; |
| 730 | |
| 731 | /* we found the connection on the second time through the list */ |
| 732 | found_extant_second: |
| 733 | if (hdr->securityIndex != conn->security_ix) { |
| 734 | write_unlock_bh(&trans->conn_lock); |
| 735 | goto security_mismatch; |
| 736 | } |
| 737 | atomic_inc(&conn->usage); |
| 738 | write_unlock_bh(&trans->conn_lock); |
| 739 | kfree(candidate); |
| 740 | goto success; |
| 741 | |
| 742 | security_mismatch: |
| 743 | kfree(candidate); |
| 744 | _leave(" = -EKEYREJECTED"); |
| 745 | return ERR_PTR(-EKEYREJECTED); |
| 746 | } |
| 747 | |
| 748 | /* |
| 749 | * find a connection based on transport and RxRPC connection ID for an incoming |
| 750 | * packet |
| 751 | */ |
| 752 | struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans, |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 753 | struct rxrpc_host_header *hdr) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 754 | { |
| 755 | struct rxrpc_connection *conn; |
| 756 | struct rb_node *p; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 757 | u32 epoch, cid; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 758 | |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 759 | _enter(",{%x,%x}", hdr->cid, hdr->flags); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 760 | |
| 761 | read_lock_bh(&trans->conn_lock); |
| 762 | |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 763 | cid = hdr->cid & RXRPC_CIDMASK; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 764 | epoch = hdr->epoch; |
| 765 | |
| 766 | if (hdr->flags & RXRPC_CLIENT_INITIATED) |
| 767 | p = trans->server_conns.rb_node; |
| 768 | else |
| 769 | p = trans->client_conns.rb_node; |
| 770 | |
| 771 | while (p) { |
| 772 | conn = rb_entry(p, struct rxrpc_connection, node); |
| 773 | |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 774 | _debug("maybe %x", conn->cid); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 775 | |
| 776 | if (epoch < conn->epoch) |
| 777 | p = p->rb_left; |
| 778 | else if (epoch > conn->epoch) |
| 779 | p = p->rb_right; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 780 | else if (cid < conn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 781 | p = p->rb_left; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 782 | else if (cid > conn->cid) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 783 | p = p->rb_right; |
| 784 | else |
| 785 | goto found; |
| 786 | } |
| 787 | |
| 788 | read_unlock_bh(&trans->conn_lock); |
| 789 | _leave(" = NULL"); |
| 790 | return NULL; |
| 791 | |
| 792 | found: |
| 793 | atomic_inc(&conn->usage); |
| 794 | read_unlock_bh(&trans->conn_lock); |
| 795 | _leave(" = %p", conn); |
| 796 | return conn; |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * release a virtual connection |
| 801 | */ |
| 802 | void rxrpc_put_connection(struct rxrpc_connection *conn) |
| 803 | { |
| 804 | _enter("%p{u=%d,d=%d}", |
| 805 | conn, atomic_read(&conn->usage), conn->debug_id); |
| 806 | |
| 807 | ASSERTCMP(atomic_read(&conn->usage), >, 0); |
| 808 | |
Ksenija Stanojevic | 22a3f9a | 2015-09-17 18:12:53 +0200 | [diff] [blame] | 809 | conn->put_time = ktime_get_seconds(); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 810 | if (atomic_dec_and_test(&conn->usage)) { |
| 811 | _debug("zombie"); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 812 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 813 | } |
| 814 | |
| 815 | _leave(""); |
| 816 | } |
| 817 | |
| 818 | /* |
| 819 | * destroy a virtual connection |
| 820 | */ |
| 821 | static void rxrpc_destroy_connection(struct rxrpc_connection *conn) |
| 822 | { |
| 823 | _enter("%p{%d}", conn, atomic_read(&conn->usage)); |
| 824 | |
| 825 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); |
| 826 | |
| 827 | _net("DESTROY CONN %d", conn->debug_id); |
| 828 | |
| 829 | if (conn->bundle) |
| 830 | rxrpc_put_bundle(conn->trans, conn->bundle); |
| 831 | |
| 832 | ASSERT(RB_EMPTY_ROOT(&conn->calls)); |
| 833 | rxrpc_purge_queue(&conn->rx_queue); |
| 834 | |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 835 | conn->security->clear(conn); |
| 836 | key_put(conn->key); |
| 837 | key_put(conn->server_key); |
| 838 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 839 | rxrpc_put_transport(conn->trans); |
| 840 | kfree(conn); |
| 841 | _leave(""); |
| 842 | } |
| 843 | |
| 844 | /* |
| 845 | * reap dead connections |
| 846 | */ |
Roel Kluin | 5eaa65b | 2008-12-10 15:18:31 -0800 | [diff] [blame] | 847 | static void rxrpc_connection_reaper(struct work_struct *work) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 848 | { |
| 849 | struct rxrpc_connection *conn, *_p; |
| 850 | unsigned long now, earliest, reap_time; |
| 851 | |
| 852 | LIST_HEAD(graveyard); |
| 853 | |
| 854 | _enter(""); |
| 855 | |
Ksenija Stanojevic | 22a3f9a | 2015-09-17 18:12:53 +0200 | [diff] [blame] | 856 | now = ktime_get_seconds(); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 857 | earliest = ULONG_MAX; |
| 858 | |
| 859 | write_lock_bh(&rxrpc_connection_lock); |
| 860 | list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) { |
| 861 | _debug("reap CONN %d { u=%d,t=%ld }", |
| 862 | conn->debug_id, atomic_read(&conn->usage), |
| 863 | (long) now - (long) conn->put_time); |
| 864 | |
| 865 | if (likely(atomic_read(&conn->usage) > 0)) |
| 866 | continue; |
| 867 | |
| 868 | spin_lock(&conn->trans->client_lock); |
| 869 | write_lock(&conn->trans->conn_lock); |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 870 | reap_time = conn->put_time + rxrpc_connection_expiry; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 871 | |
| 872 | if (atomic_read(&conn->usage) > 0) { |
| 873 | ; |
| 874 | } else if (reap_time <= now) { |
| 875 | list_move_tail(&conn->link, &graveyard); |
| 876 | if (conn->out_clientflag) |
| 877 | rb_erase(&conn->node, |
| 878 | &conn->trans->client_conns); |
| 879 | else |
| 880 | rb_erase(&conn->node, |
| 881 | &conn->trans->server_conns); |
| 882 | if (conn->bundle) { |
| 883 | list_del_init(&conn->bundle_link); |
| 884 | conn->bundle->num_conns--; |
| 885 | } |
| 886 | |
| 887 | } else if (reap_time < earliest) { |
| 888 | earliest = reap_time; |
| 889 | } |
| 890 | |
| 891 | write_unlock(&conn->trans->conn_lock); |
| 892 | spin_unlock(&conn->trans->client_lock); |
| 893 | } |
| 894 | write_unlock_bh(&rxrpc_connection_lock); |
| 895 | |
| 896 | if (earliest != ULONG_MAX) { |
| 897 | _debug("reschedule reaper %ld", (long) earliest - now); |
| 898 | ASSERTCMP(earliest, >, now); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 899 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, |
| 900 | (earliest - now) * HZ); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 901 | } |
| 902 | |
| 903 | /* then destroy all those pulled out */ |
| 904 | while (!list_empty(&graveyard)) { |
| 905 | conn = list_entry(graveyard.next, struct rxrpc_connection, |
| 906 | link); |
| 907 | list_del_init(&conn->link); |
| 908 | |
| 909 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); |
| 910 | rxrpc_destroy_connection(conn); |
| 911 | } |
| 912 | |
| 913 | _leave(""); |
| 914 | } |
| 915 | |
| 916 | /* |
| 917 | * preemptively destroy all the connection records rather than waiting for them |
| 918 | * to time out |
| 919 | */ |
| 920 | void __exit rxrpc_destroy_all_connections(void) |
| 921 | { |
| 922 | _enter(""); |
| 923 | |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 924 | rxrpc_connection_expiry = 0; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 925 | cancel_delayed_work(&rxrpc_connection_reap); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 926 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 927 | |
| 928 | _leave(""); |
| 929 | } |