David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1 | /* 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 Perches | 9b6d539 | 2016-06-02 12:08:52 -0700 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 13 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/slab.h> |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/circ_buf.h> |
Tim Smith | 7727640 | 2014-03-03 23:04:45 +0000 | [diff] [blame] | 17 | #include <linux/spinlock_types.h> |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 18 | #include <net/sock.h> |
| 19 | #include <net/af_rxrpc.h> |
| 20 | #include "ar-internal.h" |
| 21 | |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 22 | /* |
| 23 | * Maximum lifetime of a call (in jiffies). |
| 24 | */ |
David Howells | dad8aff | 2016-03-09 23:22:56 +0000 | [diff] [blame] | 25 | unsigned int rxrpc_max_call_lifetime = 60 * HZ; |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 26 | |
David Howells | 5b8848d | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 27 | const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { |
David Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 28 | [RXRPC_CALL_UNINITIALISED] = "Uninit ", |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 29 | [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", |
David Howells | 1f8481d | 2007-05-22 16:14:24 -0700 | [diff] [blame] | 30 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
| 31 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", |
| 32 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", |
| 33 | [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK", |
| 34 | [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 Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { |
| 44 | [RXRPC_CALL_SUCCEEDED] = "Complete", |
David Howells | 1f8481d | 2007-05-22 16:14:24 -0700 | [diff] [blame] | 45 | [RXRPC_CALL_SERVER_BUSY] = "SvBusy ", |
| 46 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", |
| 47 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", |
David Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 48 | [RXRPC_CALL_LOCAL_ERROR] = "LocError", |
David Howells | 1f8481d | 2007-05-22 16:14:24 -0700 | [diff] [blame] | 49 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", |
David Howells | 1f8481d | 2007-05-22 16:14:24 -0700 | [diff] [blame] | 50 | }; |
| 51 | |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 52 | const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = { |
| 53 | [rxrpc_call_new_client] = "NWc", |
| 54 | [rxrpc_call_new_service] = "NWs", |
| 55 | [rxrpc_call_queued] = "QUE", |
| 56 | [rxrpc_call_queued_ref] = "QUR", |
| 57 | [rxrpc_call_seen] = "SEE", |
| 58 | [rxrpc_call_got] = "GOT", |
| 59 | [rxrpc_call_got_skb] = "Gsk", |
| 60 | [rxrpc_call_got_userid] = "Gus", |
| 61 | [rxrpc_call_put] = "PUT", |
| 62 | [rxrpc_call_put_skb] = "Psk", |
| 63 | [rxrpc_call_put_userid] = "Pus", |
| 64 | [rxrpc_call_put_noqueue] = "PNQ", |
| 65 | }; |
| 66 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 67 | struct kmem_cache *rxrpc_call_jar; |
| 68 | LIST_HEAD(rxrpc_calls); |
| 69 | DEFINE_RWLOCK(rxrpc_call_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 70 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 71 | static void rxrpc_call_life_expired(unsigned long _call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 72 | static void rxrpc_ack_time_expired(unsigned long _call); |
| 73 | static void rxrpc_resend_time_expired(unsigned long _call); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 74 | static void rxrpc_cleanup_call(struct rxrpc_call *call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 75 | |
| 76 | /* |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 77 | * find an extant server call |
| 78 | * - called in process context with IRQs enabled |
| 79 | */ |
| 80 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, |
| 81 | unsigned long user_call_ID) |
| 82 | { |
| 83 | struct rxrpc_call *call; |
| 84 | struct rb_node *p; |
| 85 | |
| 86 | _enter("%p,%lx", rx, user_call_ID); |
| 87 | |
| 88 | read_lock(&rx->call_lock); |
| 89 | |
| 90 | p = rx->calls.rb_node; |
| 91 | while (p) { |
| 92 | call = rb_entry(p, struct rxrpc_call, sock_node); |
| 93 | |
| 94 | if (user_call_ID < call->user_call_ID) |
| 95 | p = p->rb_left; |
| 96 | else if (user_call_ID > call->user_call_ID) |
| 97 | p = p->rb_right; |
| 98 | else |
| 99 | goto found_extant_call; |
| 100 | } |
| 101 | |
| 102 | read_unlock(&rx->call_lock); |
| 103 | _leave(" = NULL"); |
| 104 | return NULL; |
| 105 | |
| 106 | found_extant_call: |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 107 | rxrpc_get_call(call, rxrpc_call_got); |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 108 | read_unlock(&rx->call_lock); |
| 109 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); |
| 110 | return call; |
| 111 | } |
| 112 | |
| 113 | /* |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 114 | * allocate a new call |
| 115 | */ |
| 116 | static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) |
| 117 | { |
| 118 | struct rxrpc_call *call; |
| 119 | |
| 120 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); |
| 121 | if (!call) |
| 122 | return NULL; |
| 123 | |
| 124 | call->acks_winsz = 16; |
| 125 | call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long), |
| 126 | gfp); |
| 127 | if (!call->acks_window) { |
| 128 | kmem_cache_free(rxrpc_call_jar, call); |
| 129 | return NULL; |
| 130 | } |
| 131 | |
| 132 | setup_timer(&call->lifetimer, &rxrpc_call_life_expired, |
| 133 | (unsigned long) call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 134 | setup_timer(&call->ack_timer, &rxrpc_ack_time_expired, |
| 135 | (unsigned long) call); |
| 136 | setup_timer(&call->resend_timer, &rxrpc_resend_time_expired, |
| 137 | (unsigned long) call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 138 | INIT_WORK(&call->processor, &rxrpc_process_call); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 139 | INIT_LIST_HEAD(&call->link); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 140 | INIT_LIST_HEAD(&call->chan_wait_link); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 141 | INIT_LIST_HEAD(&call->accept_link); |
| 142 | skb_queue_head_init(&call->rx_queue); |
| 143 | skb_queue_head_init(&call->rx_oos_queue); |
David Howells | d001648 | 2016-08-30 20:42:14 +0100 | [diff] [blame] | 144 | skb_queue_head_init(&call->knlrecv_queue); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 145 | init_waitqueue_head(&call->waitq); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 146 | spin_lock_init(&call->lock); |
| 147 | rwlock_init(&call->state_lock); |
| 148 | atomic_set(&call->usage, 1); |
| 149 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 150 | |
| 151 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); |
| 152 | |
| 153 | call->rx_data_expect = 1; |
| 154 | call->rx_data_eaten = 0; |
| 155 | call->rx_first_oos = 0; |
David Howells | 817913d | 2014-02-07 18:10:30 +0000 | [diff] [blame] | 156 | call->ackr_win_top = call->rx_data_eaten + 1 + rxrpc_rx_window_size; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 157 | call->creation_jif = jiffies; |
| 158 | return call; |
| 159 | } |
| 160 | |
| 161 | /* |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 162 | * Allocate a new client call. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 163 | */ |
David Howells | aa390bb | 2016-06-17 10:06:56 +0100 | [diff] [blame] | 164 | static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
| 165 | struct sockaddr_rxrpc *srx, |
| 166 | gfp_t gfp) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 167 | { |
| 168 | struct rxrpc_call *call; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 169 | |
| 170 | _enter(""); |
| 171 | |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 172 | ASSERT(rx->local != NULL); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 173 | |
| 174 | call = rxrpc_alloc_call(gfp); |
| 175 | if (!call) |
| 176 | return ERR_PTR(-ENOMEM); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 177 | call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 178 | call->rx_data_post = 1; |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 179 | call->service_id = srx->srx_service; |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 180 | rcu_assign_pointer(call->socket, rx); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 181 | |
| 182 | _leave(" = %p", call); |
| 183 | return call; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Begin client call. |
| 188 | */ |
| 189 | static int rxrpc_begin_client_call(struct rxrpc_call *call, |
| 190 | struct rxrpc_conn_parameters *cp, |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 191 | struct sockaddr_rxrpc *srx, |
| 192 | gfp_t gfp) |
| 193 | { |
| 194 | int ret; |
| 195 | |
| 196 | /* Set up or get a connection record and set the protocol parameters, |
| 197 | * including channel number and call ID. |
| 198 | */ |
David Howells | aa390bb | 2016-06-17 10:06:56 +0100 | [diff] [blame] | 199 | ret = rxrpc_connect_call(call, cp, srx, gfp); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 200 | if (ret < 0) |
| 201 | return ret; |
| 202 | |
David Howells | 85f3227 | 2016-04-04 14:00:36 +0100 | [diff] [blame] | 203 | spin_lock(&call->conn->params.peer->lock); |
| 204 | hlist_add_head(&call->error_link, &call->conn->params.peer->error_targets); |
| 205 | spin_unlock(&call->conn->params.peer->lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 206 | |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 207 | call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 208 | add_timer(&call->lifetimer); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 209 | return 0; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | /* |
| 213 | * set up a call for the given data |
| 214 | * - called in process context with IRQs enabled |
| 215 | */ |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 216 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
David Howells | 19ffa01 | 2016-04-04 14:00:36 +0100 | [diff] [blame] | 217 | struct rxrpc_conn_parameters *cp, |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 218 | struct sockaddr_rxrpc *srx, |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 219 | unsigned long user_call_ID, |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 220 | gfp_t gfp) |
| 221 | { |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 222 | struct rxrpc_call *call, *xcall; |
| 223 | struct rb_node *parent, **pp; |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 224 | const void *here = __builtin_return_address(0); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 225 | int ret; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 226 | |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 227 | _enter("%p,%lx", rx, user_call_ID); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 228 | |
David Howells | aa390bb | 2016-06-17 10:06:56 +0100 | [diff] [blame] | 229 | call = rxrpc_alloc_client_call(rx, srx, gfp); |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 230 | if (IS_ERR(call)) { |
| 231 | _leave(" = %ld", PTR_ERR(call)); |
| 232 | return call; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 233 | } |
| 234 | |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 235 | trace_rxrpc_call(call, 0, atomic_read(&call->usage), here, |
| 236 | (const void *)user_call_ID); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 237 | |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 238 | /* Publish the call, even though it is incompletely set up as yet */ |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 239 | call->user_call_ID = user_call_ID; |
| 240 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 241 | |
| 242 | write_lock(&rx->call_lock); |
| 243 | |
| 244 | pp = &rx->calls.rb_node; |
| 245 | parent = NULL; |
| 246 | while (*pp) { |
| 247 | parent = *pp; |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 248 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 249 | |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 250 | if (user_call_ID < xcall->user_call_ID) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 251 | pp = &(*pp)->rb_left; |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 252 | else if (user_call_ID > xcall->user_call_ID) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 253 | pp = &(*pp)->rb_right; |
| 254 | else |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 255 | goto found_user_ID_now_present; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 256 | } |
| 257 | |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 258 | rxrpc_get_call(call, rxrpc_call_got_userid); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 259 | rb_link_node(&call->sock_node, parent, pp); |
| 260 | rb_insert_color(&call->sock_node, &rx->calls); |
| 261 | write_unlock(&rx->call_lock); |
| 262 | |
| 263 | write_lock_bh(&rxrpc_call_lock); |
| 264 | list_add_tail(&call->link, &rxrpc_calls); |
| 265 | write_unlock_bh(&rxrpc_call_lock); |
| 266 | |
David Howells | aa390bb | 2016-06-17 10:06:56 +0100 | [diff] [blame] | 267 | ret = rxrpc_begin_client_call(call, cp, srx, gfp); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 268 | if (ret < 0) |
| 269 | goto error; |
| 270 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 271 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); |
| 272 | |
| 273 | _leave(" = %p [new]", call); |
| 274 | return call; |
| 275 | |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 276 | error: |
| 277 | write_lock(&rx->call_lock); |
| 278 | rb_erase(&call->sock_node, &rx->calls); |
| 279 | write_unlock(&rx->call_lock); |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 280 | rxrpc_put_call(call, rxrpc_call_put_userid); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 281 | |
| 282 | write_lock_bh(&rxrpc_call_lock); |
David Howells | d1e858c | 2016-04-04 14:00:39 +0100 | [diff] [blame] | 283 | list_del_init(&call->link); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 284 | write_unlock_bh(&rxrpc_call_lock); |
| 285 | |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 286 | error_out: |
| 287 | __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, |
| 288 | RX_CALL_DEAD, ret); |
David Howells | 17b963e | 2016-08-08 13:06:41 +0100 | [diff] [blame] | 289 | set_bit(RXRPC_CALL_RELEASED, &call->flags); |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 290 | rxrpc_put_call(call, rxrpc_call_put); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 291 | _leave(" = %d", ret); |
| 292 | return ERR_PTR(ret); |
| 293 | |
David Howells | 2341e07 | 2016-06-09 23:02:51 +0100 | [diff] [blame] | 294 | /* We unexpectedly found the user ID in the list after taking |
| 295 | * the call_lock. This shouldn't happen unless the user races |
| 296 | * with itself and tries to add the same user ID twice at the |
| 297 | * same time in different threads. |
| 298 | */ |
| 299 | found_user_ID_now_present: |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 300 | write_unlock(&rx->call_lock); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 301 | ret = -EEXIST; |
| 302 | goto error_out; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | /* |
| 306 | * set up an incoming call |
| 307 | * - called in process context with IRQs enabled |
| 308 | */ |
| 309 | struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, |
| 310 | struct rxrpc_connection *conn, |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 311 | struct sk_buff *skb) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 312 | { |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 313 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 314 | struct rxrpc_call *call, *candidate; |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 315 | const void *here = __builtin_return_address(0); |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 316 | u32 call_id, chan; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 317 | |
David Howells | 843099c | 2016-04-07 17:23:37 +0100 | [diff] [blame] | 318 | _enter(",%d", conn->debug_id); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 319 | |
| 320 | ASSERT(rx != NULL); |
| 321 | |
David Howells | 843099c | 2016-04-07 17:23:37 +0100 | [diff] [blame] | 322 | candidate = rxrpc_alloc_call(GFP_NOIO); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 323 | if (!candidate) |
| 324 | return ERR_PTR(-EBUSY); |
| 325 | |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 326 | trace_rxrpc_call(candidate, rxrpc_call_new_service, |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 327 | atomic_read(&candidate->usage), here, NULL); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 328 | |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 329 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 330 | candidate->conn = conn; |
David Howells | df5d8bf | 2016-08-24 14:31:43 +0100 | [diff] [blame] | 331 | candidate->peer = conn->params.peer; |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 332 | candidate->cid = sp->hdr.cid; |
| 333 | candidate->call_id = sp->hdr.callNumber; |
David Howells | 278ac0c | 2016-09-07 15:19:25 +0100 | [diff] [blame] | 334 | candidate->security_ix = sp->hdr.securityIndex; |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 335 | candidate->rx_data_post = 0; |
| 336 | candidate->state = RXRPC_CALL_SERVER_ACCEPTING; |
David Howells | dabe5a7 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 337 | candidate->flags |= (1 << RXRPC_CALL_IS_SERVICE); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 338 | if (conn->security_ix > 0) |
| 339 | candidate->state = RXRPC_CALL_SERVER_SECURING; |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 340 | rcu_assign_pointer(candidate->socket, rx); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 341 | |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 342 | spin_lock(&conn->channel_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 343 | |
| 344 | /* set the channel for this call */ |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 345 | call = rcu_dereference_protected(conn->channels[chan].call, |
| 346 | lockdep_is_held(&conn->channel_lock)); |
| 347 | |
David Howells | 01a90a4 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 348 | _debug("channel[%u] is %p", candidate->cid & RXRPC_CHANNELMASK, call); |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 349 | if (call && call->call_id == sp->hdr.callNumber) { |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 350 | /* already set; must've been a duplicate packet */ |
| 351 | _debug("extant call [%d]", call->state); |
| 352 | ASSERTCMP(call->conn, ==, conn); |
| 353 | |
| 354 | read_lock(&call->state_lock); |
| 355 | switch (call->state) { |
| 356 | case RXRPC_CALL_LOCALLY_ABORTED: |
David Howells | 4c198ad | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 357 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 358 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 359 | case RXRPC_CALL_REMOTELY_ABORTED: |
| 360 | read_unlock(&call->state_lock); |
| 361 | goto aborted_call; |
| 362 | default: |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 363 | rxrpc_get_call(call, rxrpc_call_got); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 364 | read_unlock(&call->state_lock); |
| 365 | goto extant_call; |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | if (call) { |
| 370 | /* it seems the channel is still in use from the previous call |
| 371 | * - ditch the old binding if its call is now complete */ |
| 372 | _debug("CALL: %u { %s }", |
| 373 | call->debug_id, rxrpc_call_states[call->state]); |
| 374 | |
David Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 375 | if (call->state == RXRPC_CALL_COMPLETE) { |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 376 | __rxrpc_disconnect_call(conn, call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 377 | } else { |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 378 | spin_unlock(&conn->channel_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 379 | kmem_cache_free(rxrpc_call_jar, candidate); |
| 380 | _leave(" = -EBUSY"); |
| 381 | return ERR_PTR(-EBUSY); |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /* check the call number isn't duplicate */ |
| 386 | _debug("check dup"); |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 387 | call_id = sp->hdr.callNumber; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 388 | |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 389 | /* We just ignore calls prior to the current call ID. Terminated calls |
| 390 | * are handled via the connection. |
| 391 | */ |
| 392 | if (call_id <= conn->channels[chan].call_counter) |
| 393 | goto old_call; /* TODO: Just drop packet */ |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 394 | |
| 395 | /* make the call available */ |
| 396 | _debug("new call"); |
| 397 | call = candidate; |
| 398 | candidate = NULL; |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 399 | conn->channels[chan].call_counter = call_id; |
| 400 | rcu_assign_pointer(conn->channels[chan].call, call); |
David Howells | 5627cc8 | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 401 | rxrpc_get_connection(conn); |
David Howells | df5d8bf | 2016-08-24 14:31:43 +0100 | [diff] [blame] | 402 | rxrpc_get_peer(call->peer); |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 403 | spin_unlock(&conn->channel_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 404 | |
David Howells | 85f3227 | 2016-04-04 14:00:36 +0100 | [diff] [blame] | 405 | spin_lock(&conn->params.peer->lock); |
| 406 | hlist_add_head(&call->error_link, &conn->params.peer->error_targets); |
| 407 | spin_unlock(&conn->params.peer->lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 408 | |
| 409 | write_lock_bh(&rxrpc_call_lock); |
| 410 | list_add_tail(&call->link, &rxrpc_calls); |
| 411 | write_unlock_bh(&rxrpc_call_lock); |
| 412 | |
David Howells | 19ffa01 | 2016-04-04 14:00:36 +0100 | [diff] [blame] | 413 | call->service_id = conn->params.service_id; |
Tim Smith | 7727640 | 2014-03-03 23:04:45 +0000 | [diff] [blame] | 414 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 415 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
| 416 | |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 417 | call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 418 | add_timer(&call->lifetimer); |
| 419 | _leave(" = %p {%d} [new]", call, call->debug_id); |
| 420 | return call; |
| 421 | |
| 422 | extant_call: |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 423 | spin_unlock(&conn->channel_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 424 | kmem_cache_free(rxrpc_call_jar, candidate); |
| 425 | _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1); |
| 426 | return call; |
| 427 | |
| 428 | aborted_call: |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 429 | spin_unlock(&conn->channel_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 430 | kmem_cache_free(rxrpc_call_jar, candidate); |
| 431 | _leave(" = -ECONNABORTED"); |
| 432 | return ERR_PTR(-ECONNABORTED); |
| 433 | |
| 434 | old_call: |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 435 | spin_unlock(&conn->channel_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 436 | kmem_cache_free(rxrpc_call_jar, candidate); |
| 437 | _leave(" = -ECONNRESET [old]"); |
| 438 | return ERR_PTR(-ECONNRESET); |
| 439 | } |
| 440 | |
| 441 | /* |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 442 | * Queue a call's work processor, getting a ref to pass to the work queue. |
| 443 | */ |
| 444 | bool rxrpc_queue_call(struct rxrpc_call *call) |
| 445 | { |
| 446 | const void *here = __builtin_return_address(0); |
| 447 | int n = __atomic_add_unless(&call->usage, 1, 0); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 448 | if (n == 0) |
| 449 | return false; |
| 450 | if (rxrpc_queue_work(&call->processor)) |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 451 | trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 452 | else |
| 453 | rxrpc_put_call(call, rxrpc_call_put_noqueue); |
| 454 | return true; |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * Queue a call's work processor, passing the callers ref to the work queue. |
| 459 | */ |
| 460 | bool __rxrpc_queue_call(struct rxrpc_call *call) |
| 461 | { |
| 462 | const void *here = __builtin_return_address(0); |
| 463 | int n = atomic_read(&call->usage); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 464 | ASSERTCMP(n, >=, 1); |
| 465 | if (rxrpc_queue_work(&call->processor)) |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 466 | trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 467 | else |
| 468 | rxrpc_put_call(call, rxrpc_call_put_noqueue); |
| 469 | return true; |
| 470 | } |
| 471 | |
| 472 | /* |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 473 | * Note the re-emergence of a call. |
| 474 | */ |
| 475 | void rxrpc_see_call(struct rxrpc_call *call) |
| 476 | { |
| 477 | const void *here = __builtin_return_address(0); |
| 478 | if (call) { |
| 479 | int n = atomic_read(&call->usage); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 480 | |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 481 | trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 482 | } |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Note the addition of a ref on a call. |
| 487 | */ |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 488 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 489 | { |
| 490 | const void *here = __builtin_return_address(0); |
| 491 | int n = atomic_inc_return(&call->usage); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 492 | |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 493 | trace_rxrpc_call(call, op, n, here, NULL); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | /* |
| 497 | * Note the addition of a ref on a call for a socket buffer. |
| 498 | */ |
| 499 | void rxrpc_get_call_for_skb(struct rxrpc_call *call, struct sk_buff *skb) |
| 500 | { |
| 501 | const void *here = __builtin_return_address(0); |
| 502 | int n = atomic_inc_return(&call->usage); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 503 | |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 504 | trace_rxrpc_call(call, rxrpc_call_got_skb, n, here, skb); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | /* |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 508 | * detach a call from a socket and set up for release |
| 509 | */ |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 510 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 511 | { |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 512 | _enter("{%d,%d,%d,%d}", |
| 513 | call->debug_id, atomic_read(&call->usage), |
| 514 | atomic_read(&call->ackr_not_idle), |
| 515 | call->rx_first_oos); |
| 516 | |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 517 | rxrpc_see_call(call); |
| 518 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 519 | spin_lock_bh(&call->lock); |
| 520 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) |
| 521 | BUG(); |
| 522 | spin_unlock_bh(&call->lock); |
| 523 | |
| 524 | /* dissociate from the socket |
| 525 | * - the socket's ref on the call is passed to the death timer |
| 526 | */ |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 527 | _debug("RELEASE CALL %p (%d)", call, call->debug_id); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 528 | |
David Howells | f4fdb35 | 2016-09-07 14:45:26 +0100 | [diff] [blame] | 529 | if (call->peer) { |
| 530 | spin_lock(&call->peer->lock); |
| 531 | hlist_del_init(&call->error_link); |
| 532 | spin_unlock(&call->peer->lock); |
| 533 | } |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 534 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 535 | write_lock_bh(&rx->call_lock); |
| 536 | if (!list_empty(&call->accept_link)) { |
| 537 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
| 538 | call, call->events, call->flags); |
| 539 | ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags)); |
| 540 | list_del_init(&call->accept_link); |
| 541 | sk_acceptq_removed(&rx->sk); |
| 542 | } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { |
| 543 | rb_erase(&call->sock_node, &rx->calls); |
| 544 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); |
| 545 | clear_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 546 | rxrpc_put_call(call, rxrpc_call_put_userid); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 547 | } |
| 548 | write_unlock_bh(&rx->call_lock); |
| 549 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 550 | /* free up the channel for reuse */ |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 551 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) { |
| 552 | clear_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); |
| 553 | rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK); |
| 554 | rxrpc_call_completed(call); |
| 555 | } else { |
| 556 | write_lock_bh(&call->state_lock); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 557 | |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 558 | if (call->state < RXRPC_CALL_COMPLETE) { |
| 559 | _debug("+++ ABORTING STATE %d +++\n", call->state); |
David Howells | 5a42976 | 2016-09-06 22:19:51 +0100 | [diff] [blame] | 560 | __rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 561 | clear_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); |
| 562 | rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT); |
| 563 | } |
| 564 | |
| 565 | write_unlock_bh(&call->state_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 566 | } |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 567 | |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 568 | if (call->conn) |
| 569 | rxrpc_disconnect_call(call); |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 570 | |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 571 | /* clean up the Rx queue */ |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 572 | if (!skb_queue_empty(&call->rx_queue) || |
| 573 | !skb_queue_empty(&call->rx_oos_queue)) { |
| 574 | struct rxrpc_skb_priv *sp; |
| 575 | struct sk_buff *skb; |
| 576 | |
| 577 | _debug("purge Rx queues"); |
| 578 | |
| 579 | spin_lock_bh(&call->lock); |
| 580 | while ((skb = skb_dequeue(&call->rx_queue)) || |
| 581 | (skb = skb_dequeue(&call->rx_oos_queue))) { |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 582 | spin_unlock_bh(&call->lock); |
| 583 | |
Arnd Bergmann | 55cae7a | 2016-08-08 12:13:45 +0200 | [diff] [blame] | 584 | sp = rxrpc_skb(skb); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 585 | _debug("- zap %s %%%u #%u", |
| 586 | rxrpc_pkts[sp->hdr.type], |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 587 | sp->hdr.serial, sp->hdr.seq); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 588 | rxrpc_free_skb(skb); |
| 589 | spin_lock_bh(&call->lock); |
| 590 | } |
| 591 | spin_unlock_bh(&call->lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 592 | } |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 593 | rxrpc_purge_queue(&call->knlrecv_queue); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 594 | |
| 595 | del_timer_sync(&call->resend_timer); |
| 596 | del_timer_sync(&call->ack_timer); |
| 597 | del_timer_sync(&call->lifetimer); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 598 | |
| 599 | _leave(""); |
| 600 | } |
| 601 | |
| 602 | /* |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 603 | * release all the calls associated with a socket |
| 604 | */ |
| 605 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) |
| 606 | { |
| 607 | struct rxrpc_call *call; |
| 608 | struct rb_node *p; |
| 609 | |
| 610 | _enter("%p", rx); |
| 611 | |
| 612 | read_lock_bh(&rx->call_lock); |
| 613 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 614 | /* kill the not-yet-accepted incoming calls */ |
| 615 | list_for_each_entry(call, &rx->secureq, accept_link) { |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 616 | rxrpc_release_call(rx, call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 617 | } |
| 618 | |
| 619 | list_for_each_entry(call, &rx->acceptq, accept_link) { |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 620 | rxrpc_release_call(rx, call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 621 | } |
| 622 | |
David Howells | f36b5e4 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 623 | /* mark all the calls as no longer wanting incoming packets */ |
| 624 | for (p = rb_first(&rx->calls); p; p = rb_next(p)) { |
| 625 | call = rb_entry(p, struct rxrpc_call, sock_node); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 626 | rxrpc_release_call(rx, call); |
David Howells | f36b5e4 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 627 | } |
| 628 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 629 | read_unlock_bh(&rx->call_lock); |
| 630 | _leave(""); |
| 631 | } |
| 632 | |
| 633 | /* |
| 634 | * release a call |
| 635 | */ |
David Howells | fff7242 | 2016-09-07 14:34:21 +0100 | [diff] [blame] | 636 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 637 | { |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 638 | const void *here = __builtin_return_address(0); |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 639 | int n; |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 640 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 641 | ASSERT(call != NULL); |
| 642 | |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 643 | n = atomic_dec_return(&call->usage); |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 644 | trace_rxrpc_call(call, op, n, here, NULL); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 645 | ASSERTCMP(n, >=, 0); |
| 646 | if (n == 0) { |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 647 | _debug("call %d dead", call->debug_id); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 648 | rxrpc_cleanup_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 649 | } |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | /* |
| 653 | * Release a call ref held by a socket buffer. |
| 654 | */ |
| 655 | void rxrpc_put_call_for_skb(struct rxrpc_call *call, struct sk_buff *skb) |
| 656 | { |
| 657 | const void *here = __builtin_return_address(0); |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 658 | int n; |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 659 | |
| 660 | n = atomic_dec_return(&call->usage); |
David Howells | 2ab2721 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 661 | trace_rxrpc_call(call, rxrpc_call_put_skb, n, here, skb); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 662 | ASSERTCMP(n, >=, 0); |
| 663 | if (n == 0) { |
| 664 | _debug("call %d dead", call->debug_id); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 665 | rxrpc_cleanup_call(call); |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 666 | } |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | /* |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 670 | * Final call destruction under RCU. |
| 671 | */ |
| 672 | static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) |
| 673 | { |
| 674 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); |
| 675 | |
| 676 | rxrpc_purge_queue(&call->rx_queue); |
David Howells | d001648 | 2016-08-30 20:42:14 +0100 | [diff] [blame] | 677 | rxrpc_purge_queue(&call->knlrecv_queue); |
David Howells | df5d8bf | 2016-08-24 14:31:43 +0100 | [diff] [blame] | 678 | rxrpc_put_peer(call->peer); |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 679 | kmem_cache_free(rxrpc_call_jar, call); |
| 680 | } |
| 681 | |
| 682 | /* |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 683 | * clean up a call |
| 684 | */ |
| 685 | static void rxrpc_cleanup_call(struct rxrpc_call *call) |
| 686 | { |
| 687 | _net("DESTROY CALL %d", call->debug_id); |
| 688 | |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 689 | write_lock_bh(&rxrpc_call_lock); |
| 690 | list_del_init(&call->link); |
| 691 | write_unlock_bh(&rxrpc_call_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 692 | |
| 693 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); |
| 694 | |
| 695 | del_timer_sync(&call->lifetimer); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 696 | del_timer_sync(&call->ack_timer); |
| 697 | del_timer_sync(&call->resend_timer); |
| 698 | |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 699 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 700 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 701 | ASSERT(!work_pending(&call->processor)); |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 702 | ASSERTCMP(call->conn, ==, NULL); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 703 | |
| 704 | if (call->acks_window) { |
| 705 | _debug("kill Tx window %d", |
| 706 | CIRC_CNT(call->acks_head, call->acks_tail, |
| 707 | call->acks_winsz)); |
| 708 | smp_mb(); |
| 709 | while (CIRC_CNT(call->acks_head, call->acks_tail, |
| 710 | call->acks_winsz) > 0) { |
| 711 | struct rxrpc_skb_priv *sp; |
| 712 | unsigned long _skb; |
| 713 | |
| 714 | _skb = call->acks_window[call->acks_tail] & ~1; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 715 | sp = rxrpc_skb((struct sk_buff *)_skb); |
| 716 | _debug("+++ clear Tx %u", sp->hdr.seq); |
| 717 | rxrpc_free_skb((struct sk_buff *)_skb); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 718 | call->acks_tail = |
| 719 | (call->acks_tail + 1) & (call->acks_winsz - 1); |
| 720 | } |
| 721 | |
| 722 | kfree(call->acks_window); |
| 723 | } |
| 724 | |
| 725 | rxrpc_free_skb(call->tx_pending); |
| 726 | |
| 727 | rxrpc_purge_queue(&call->rx_queue); |
| 728 | ASSERT(skb_queue_empty(&call->rx_oos_queue)); |
David Howells | d001648 | 2016-08-30 20:42:14 +0100 | [diff] [blame] | 729 | rxrpc_purge_queue(&call->knlrecv_queue); |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 730 | call_rcu(&call->rcu, rxrpc_rcu_destroy_call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | /* |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 734 | * Make sure that all calls are gone. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 735 | */ |
| 736 | void __exit rxrpc_destroy_all_calls(void) |
| 737 | { |
| 738 | struct rxrpc_call *call; |
| 739 | |
| 740 | _enter(""); |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 741 | |
| 742 | if (list_empty(&rxrpc_calls)) |
| 743 | return; |
| 744 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 745 | write_lock_bh(&rxrpc_call_lock); |
| 746 | |
| 747 | while (!list_empty(&rxrpc_calls)) { |
| 748 | call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); |
| 749 | _debug("Zapping call %p", call); |
| 750 | |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 751 | rxrpc_see_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 752 | list_del_init(&call->link); |
| 753 | |
David Howells | 8d94aa3 | 2016-09-07 09:19:31 +0100 | [diff] [blame] | 754 | pr_err("Call %p still in use (%d,%d,%s,%lx,%lx)!\n", |
| 755 | call, atomic_read(&call->usage), |
| 756 | atomic_read(&call->ackr_not_idle), |
| 757 | rxrpc_call_states[call->state], |
| 758 | call->flags, call->events); |
| 759 | if (!skb_queue_empty(&call->rx_queue)) |
| 760 | pr_err("Rx queue occupied\n"); |
| 761 | if (!skb_queue_empty(&call->rx_oos_queue)) |
| 762 | pr_err("OOS queue occupied\n"); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 763 | |
| 764 | write_unlock_bh(&rxrpc_call_lock); |
| 765 | cond_resched(); |
| 766 | write_lock_bh(&rxrpc_call_lock); |
| 767 | } |
| 768 | |
| 769 | write_unlock_bh(&rxrpc_call_lock); |
| 770 | _leave(""); |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * handle call lifetime being exceeded |
| 775 | */ |
| 776 | static void rxrpc_call_life_expired(unsigned long _call) |
| 777 | { |
| 778 | struct rxrpc_call *call = (struct rxrpc_call *) _call; |
| 779 | |
David Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 780 | _enter("{%d}", call->debug_id); |
| 781 | |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 782 | rxrpc_see_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 783 | if (call->state >= RXRPC_CALL_COMPLETE) |
| 784 | return; |
| 785 | |
David Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 786 | set_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events); |
| 787 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 788 | } |
| 789 | |
| 790 | /* |
| 791 | * handle resend timer expiry |
David Howells | 3b5bac2 | 2010-08-04 02:34:17 +0000 | [diff] [blame] | 792 | * - may not take call->state_lock as this can deadlock against del_timer_sync() |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 793 | */ |
| 794 | static void rxrpc_resend_time_expired(unsigned long _call) |
| 795 | { |
| 796 | struct rxrpc_call *call = (struct rxrpc_call *) _call; |
| 797 | |
| 798 | _enter("{%d}", call->debug_id); |
| 799 | |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 800 | rxrpc_see_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 801 | if (call->state >= RXRPC_CALL_COMPLETE) |
| 802 | return; |
| 803 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 804 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
David Howells | 4c198ad | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 805 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events)) |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 806 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 807 | } |
| 808 | |
| 809 | /* |
| 810 | * handle ACK timer expiry |
| 811 | */ |
| 812 | static void rxrpc_ack_time_expired(unsigned long _call) |
| 813 | { |
| 814 | struct rxrpc_call *call = (struct rxrpc_call *) _call; |
| 815 | |
| 816 | _enter("{%d}", call->debug_id); |
| 817 | |
David Howells | e34d423 | 2016-08-30 09:49:29 +0100 | [diff] [blame] | 818 | rxrpc_see_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 819 | if (call->state >= RXRPC_CALL_COMPLETE) |
| 820 | return; |
| 821 | |
David Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 822 | if (!test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events)) |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 823 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 824 | } |