18c3e34a4SDavid Howells /* RxRPC individual remote procedure call handling 28c3e34a4SDavid Howells * 38c3e34a4SDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 48c3e34a4SDavid Howells * Written by David Howells (dhowells@redhat.com) 58c3e34a4SDavid Howells * 68c3e34a4SDavid Howells * This program is free software; you can redistribute it and/or 78c3e34a4SDavid Howells * modify it under the terms of the GNU General Public License 88c3e34a4SDavid Howells * as published by the Free Software Foundation; either version 98c3e34a4SDavid Howells * 2 of the License, or (at your option) any later version. 108c3e34a4SDavid Howells */ 118c3e34a4SDavid Howells 128c3e34a4SDavid Howells #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 138c3e34a4SDavid Howells 148c3e34a4SDavid Howells #include <linux/slab.h> 158c3e34a4SDavid Howells #include <linux/module.h> 168c3e34a4SDavid Howells #include <linux/circ_buf.h> 178c3e34a4SDavid Howells #include <linux/spinlock_types.h> 188c3e34a4SDavid Howells #include <net/sock.h> 198c3e34a4SDavid Howells #include <net/af_rxrpc.h> 208c3e34a4SDavid Howells #include "ar-internal.h" 218c3e34a4SDavid Howells 228c3e34a4SDavid Howells const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { 23999b69f8SDavid Howells [RXRPC_CALL_UNINITIALISED] = "Uninit ", 24999b69f8SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", 258c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", 268c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", 278c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", 2800e90712SDavid Howells [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", 298c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SECURING] = "SvSecure", 308c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", 318c3e34a4SDavid Howells [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", 328c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 338c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 348c3e34a4SDavid Howells [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 358c3e34a4SDavid Howells [RXRPC_CALL_COMPLETE] = "Complete", 36f5c17aaeSDavid Howells }; 37f5c17aaeSDavid Howells 38f5c17aaeSDavid Howells const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 39f5c17aaeSDavid Howells [RXRPC_CALL_SUCCEEDED] = "Complete", 408c3e34a4SDavid Howells [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 418c3e34a4SDavid Howells [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 42f5c17aaeSDavid Howells [RXRPC_CALL_LOCAL_ERROR] = "LocError", 438c3e34a4SDavid Howells [RXRPC_CALL_NETWORK_ERROR] = "NetError", 448c3e34a4SDavid Howells }; 458c3e34a4SDavid Howells 468c3e34a4SDavid Howells struct kmem_cache *rxrpc_call_jar; 478c3e34a4SDavid Howells 48e99e88a9SKees Cook static void rxrpc_call_timer_expired(struct timer_list *t) 49248f219cSDavid Howells { 50e99e88a9SKees Cook struct rxrpc_call *call = from_timer(call, t, timer); 51248f219cSDavid Howells 52248f219cSDavid Howells _enter("%d", call->debug_id); 53248f219cSDavid Howells 54405dea1dSDavid Howells if (call->state < RXRPC_CALL_COMPLETE) 55405dea1dSDavid Howells rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real()); 56fc7ab6d2SDavid Howells } 578c3e34a4SDavid Howells 588c3e34a4SDavid Howells /* 598c3e34a4SDavid Howells * find an extant server call 608c3e34a4SDavid Howells * - called in process context with IRQs enabled 618c3e34a4SDavid Howells */ 628c3e34a4SDavid Howells struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 638c3e34a4SDavid Howells unsigned long user_call_ID) 648c3e34a4SDavid Howells { 658c3e34a4SDavid Howells struct rxrpc_call *call; 668c3e34a4SDavid Howells struct rb_node *p; 678c3e34a4SDavid Howells 688c3e34a4SDavid Howells _enter("%p,%lx", rx, user_call_ID); 698c3e34a4SDavid Howells 708c3e34a4SDavid Howells read_lock(&rx->call_lock); 718c3e34a4SDavid Howells 728c3e34a4SDavid Howells p = rx->calls.rb_node; 738c3e34a4SDavid Howells while (p) { 748c3e34a4SDavid Howells call = rb_entry(p, struct rxrpc_call, sock_node); 758c3e34a4SDavid Howells 768c3e34a4SDavid Howells if (user_call_ID < call->user_call_ID) 778c3e34a4SDavid Howells p = p->rb_left; 788c3e34a4SDavid Howells else if (user_call_ID > call->user_call_ID) 798c3e34a4SDavid Howells p = p->rb_right; 808c3e34a4SDavid Howells else 818c3e34a4SDavid Howells goto found_extant_call; 828c3e34a4SDavid Howells } 838c3e34a4SDavid Howells 848c3e34a4SDavid Howells read_unlock(&rx->call_lock); 858c3e34a4SDavid Howells _leave(" = NULL"); 868c3e34a4SDavid Howells return NULL; 878c3e34a4SDavid Howells 888c3e34a4SDavid Howells found_extant_call: 89fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got); 908c3e34a4SDavid Howells read_unlock(&rx->call_lock); 918c3e34a4SDavid Howells _leave(" = %p [%d]", call, atomic_read(&call->usage)); 928c3e34a4SDavid Howells return call; 938c3e34a4SDavid Howells } 948c3e34a4SDavid Howells 958c3e34a4SDavid Howells /* 968c3e34a4SDavid Howells * allocate a new call 978c3e34a4SDavid Howells */ 9800e90712SDavid Howells struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) 998c3e34a4SDavid Howells { 1008c3e34a4SDavid Howells struct rxrpc_call *call; 1018c3e34a4SDavid Howells 1028c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1038c3e34a4SDavid Howells if (!call) 1048c3e34a4SDavid Howells return NULL; 1058c3e34a4SDavid Howells 106248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 107248f219cSDavid Howells sizeof(struct sk_buff *), 1088c3e34a4SDavid Howells gfp); 109248f219cSDavid Howells if (!call->rxtx_buffer) 110248f219cSDavid Howells goto nomem; 1118c3e34a4SDavid Howells 112248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 113248f219cSDavid Howells if (!call->rxtx_annotations) 114248f219cSDavid Howells goto nomem_2; 115248f219cSDavid Howells 116540b1c48SDavid Howells mutex_init(&call->user_mutex); 117e99e88a9SKees Cook timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 1188c3e34a4SDavid Howells INIT_WORK(&call->processor, &rxrpc_process_call); 119999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 12045025bceSDavid Howells INIT_LIST_HEAD(&call->chan_wait_link); 1218c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 122248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 123248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 12445025bceSDavid Howells init_waitqueue_head(&call->waitq); 1258c3e34a4SDavid Howells spin_lock_init(&call->lock); 12620acbd9aSDavid Howells spin_lock_init(&call->notify_lock); 1278c3e34a4SDavid Howells rwlock_init(&call->state_lock); 1288c3e34a4SDavid Howells atomic_set(&call->usage, 1); 1298c3e34a4SDavid Howells call->debug_id = atomic_inc_return(&rxrpc_debug_id); 130e754eba6SDavid Howells call->tx_total_len = -1; 1318c3e34a4SDavid Howells 1328c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1338c3e34a4SDavid Howells 134248f219cSDavid Howells /* Leave space in the ring to handle a maxed-out jumbo packet */ 13575e42126SDavid Howells call->rx_winsize = rxrpc_rx_window_size; 136248f219cSDavid Howells call->tx_winsize = 16; 137248f219cSDavid Howells call->rx_expect_next = 1; 13857494343SDavid Howells 13957494343SDavid Howells call->cong_cwnd = 2; 14057494343SDavid Howells call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 1418c3e34a4SDavid Howells return call; 142248f219cSDavid Howells 143248f219cSDavid Howells nomem_2: 144248f219cSDavid Howells kfree(call->rxtx_buffer); 145248f219cSDavid Howells nomem: 146248f219cSDavid Howells kmem_cache_free(rxrpc_call_jar, call); 147248f219cSDavid Howells return NULL; 1488c3e34a4SDavid Howells } 1498c3e34a4SDavid Howells 1508c3e34a4SDavid Howells /* 151999b69f8SDavid Howells * Allocate a new client call. 1528c3e34a4SDavid Howells */ 153248f219cSDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx, 1548c3e34a4SDavid Howells gfp_t gfp) 1558c3e34a4SDavid Howells { 1568c3e34a4SDavid Howells struct rxrpc_call *call; 15757494343SDavid Howells ktime_t now; 1588c3e34a4SDavid Howells 1598c3e34a4SDavid Howells _enter(""); 1608c3e34a4SDavid Howells 1618c3e34a4SDavid Howells call = rxrpc_alloc_call(gfp); 1628c3e34a4SDavid Howells if (!call) 1638c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 164999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 165999b69f8SDavid Howells call->service_id = srx->srx_service; 16671f3ca40SDavid Howells call->tx_phase = true; 16757494343SDavid Howells now = ktime_get_real(); 16857494343SDavid Howells call->acks_latest_ts = now; 16957494343SDavid Howells call->cong_tstamp = now; 170999b69f8SDavid Howells 171999b69f8SDavid Howells _leave(" = %p", call); 172999b69f8SDavid Howells return call; 173999b69f8SDavid Howells } 174999b69f8SDavid Howells 175999b69f8SDavid Howells /* 176248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 177999b69f8SDavid Howells */ 178248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 179999b69f8SDavid Howells { 180df0adc78SDavid Howells ktime_t now = ktime_get_real(), expire_at; 181999b69f8SDavid Howells 182df0adc78SDavid Howells expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime); 183248f219cSDavid Howells call->expire_at = expire_at; 184248f219cSDavid Howells call->ack_at = expire_at; 185a5af7e1fSDavid Howells call->ping_at = expire_at; 186248f219cSDavid Howells call->resend_at = expire_at; 187df0adc78SDavid Howells call->timer.expires = jiffies + LONG_MAX / 2; 188df0adc78SDavid Howells rxrpc_set_timer(call, rxrpc_timer_begin, now); 1898c3e34a4SDavid Howells } 1908c3e34a4SDavid Howells 1918c3e34a4SDavid Howells /* 192540b1c48SDavid Howells * Set up a call for the given parameters. 193540b1c48SDavid Howells * - Called with the socket lock held, which it must release. 194540b1c48SDavid Howells * - If it returns a call, the call's lock will need releasing by the caller. 1958c3e34a4SDavid Howells */ 1968c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 19719ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 198999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 1998c3e34a4SDavid Howells unsigned long user_call_ID, 200e754eba6SDavid Howells s64 tx_total_len, 2018c3e34a4SDavid Howells gfp_t gfp) 202540b1c48SDavid Howells __releases(&rx->sk.sk_lock.slock) 2038c3e34a4SDavid Howells { 2048c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 2052baec2c3SDavid Howells struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 2068c3e34a4SDavid Howells struct rb_node *parent, **pp; 207e34d4234SDavid Howells const void *here = __builtin_return_address(0); 208999b69f8SDavid Howells int ret; 2098c3e34a4SDavid Howells 210999b69f8SDavid Howells _enter("%p,%lx", rx, user_call_ID); 2118c3e34a4SDavid Howells 212248f219cSDavid Howells call = rxrpc_alloc_client_call(srx, gfp); 2138c3e34a4SDavid Howells if (IS_ERR(call)) { 214540b1c48SDavid Howells release_sock(&rx->sk); 2158c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2168c3e34a4SDavid Howells return call; 2178c3e34a4SDavid Howells } 2188c3e34a4SDavid Howells 219e754eba6SDavid Howells call->tx_total_len = tx_total_len; 220a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 221a84a46d7SDavid Howells here, (const void *)user_call_ID); 222e34d4234SDavid Howells 223540b1c48SDavid Howells /* We need to protect a partially set up call against the user as we 224540b1c48SDavid Howells * will be acting outside the socket lock. 225540b1c48SDavid Howells */ 226540b1c48SDavid Howells mutex_lock(&call->user_mutex); 227540b1c48SDavid Howells 228999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2298c3e34a4SDavid Howells write_lock(&rx->call_lock); 2308c3e34a4SDavid Howells 2318c3e34a4SDavid Howells pp = &rx->calls.rb_node; 2328c3e34a4SDavid Howells parent = NULL; 2338c3e34a4SDavid Howells while (*pp) { 2348c3e34a4SDavid Howells parent = *pp; 2358c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 2368c3e34a4SDavid Howells 2378c3e34a4SDavid Howells if (user_call_ID < xcall->user_call_ID) 2388c3e34a4SDavid Howells pp = &(*pp)->rb_left; 2398c3e34a4SDavid Howells else if (user_call_ID > xcall->user_call_ID) 2408c3e34a4SDavid Howells pp = &(*pp)->rb_right; 2418c3e34a4SDavid Howells else 242357f5ef6SDavid Howells goto error_dup_user_ID; 2438c3e34a4SDavid Howells } 2448c3e34a4SDavid Howells 245248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 246357f5ef6SDavid Howells call->user_call_ID = user_call_ID; 247357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 248fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2498c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2508c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 251248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 252248f219cSDavid Howells 2538c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2548c3e34a4SDavid Howells 2552baec2c3SDavid Howells write_lock(&rxnet->call_lock); 2562baec2c3SDavid Howells list_add_tail(&call->link, &rxnet->calls); 2572baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 2588c3e34a4SDavid Howells 259540b1c48SDavid Howells /* From this point on, the call is protected by its own lock. */ 260540b1c48SDavid Howells release_sock(&rx->sk); 261540b1c48SDavid Howells 262248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 263248f219cSDavid Howells * including channel number and call ID. 264248f219cSDavid Howells */ 265248f219cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 266999b69f8SDavid Howells if (ret < 0) 267999b69f8SDavid Howells goto error; 268999b69f8SDavid Howells 269a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 27054fde423SDavid Howells here, NULL); 271a84a46d7SDavid Howells 272248f219cSDavid Howells rxrpc_start_call_timer(call); 273248f219cSDavid Howells 2748c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 2758c3e34a4SDavid Howells 2768c3e34a4SDavid Howells _leave(" = %p [new]", call); 2778c3e34a4SDavid Howells return call; 2788c3e34a4SDavid Howells 2798c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 2808c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 2818c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 2828c3e34a4SDavid Howells * same time in different threads. 2838c3e34a4SDavid Howells */ 284357f5ef6SDavid Howells error_dup_user_ID: 2858c3e34a4SDavid Howells write_unlock(&rx->call_lock); 286540b1c48SDavid Howells release_sock(&rx->sk); 2878d94aa38SDavid Howells ret = -EEXIST; 288357f5ef6SDavid Howells 289357f5ef6SDavid Howells error: 290357f5ef6SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 291357f5ef6SDavid Howells RX_CALL_DEAD, ret); 292a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 293a84a46d7SDavid Howells here, ERR_PTR(ret)); 294357f5ef6SDavid Howells rxrpc_release_call(rx, call); 295540b1c48SDavid Howells mutex_unlock(&call->user_mutex); 296357f5ef6SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 297357f5ef6SDavid Howells _leave(" = %d", ret); 298357f5ef6SDavid Howells return ERR_PTR(ret); 2998c3e34a4SDavid Howells } 3008c3e34a4SDavid Howells 3018c3e34a4SDavid Howells /* 302c038a58cSDavid Howells * Retry a call to a new address. It is expected that the Tx queue of the call 303c038a58cSDavid Howells * will contain data previously packaged for an old call. 304c038a58cSDavid Howells */ 305c038a58cSDavid Howells int rxrpc_retry_client_call(struct rxrpc_sock *rx, 306c038a58cSDavid Howells struct rxrpc_call *call, 307c038a58cSDavid Howells struct rxrpc_conn_parameters *cp, 308c038a58cSDavid Howells struct sockaddr_rxrpc *srx, 309c038a58cSDavid Howells gfp_t gfp) 310c038a58cSDavid Howells { 311c038a58cSDavid Howells const void *here = __builtin_return_address(0); 312c038a58cSDavid Howells int ret; 313c038a58cSDavid Howells 314c038a58cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 315c038a58cSDavid Howells * including channel number and call ID. 316c038a58cSDavid Howells */ 317c038a58cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 318c038a58cSDavid Howells if (ret < 0) 319c038a58cSDavid Howells goto error; 320c038a58cSDavid Howells 321c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 322c038a58cSDavid Howells here, NULL); 323c038a58cSDavid Howells 324c038a58cSDavid Howells rxrpc_start_call_timer(call); 325c038a58cSDavid Howells 326c038a58cSDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 327c038a58cSDavid Howells 328c038a58cSDavid Howells if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 329c038a58cSDavid Howells rxrpc_queue_call(call); 330c038a58cSDavid Howells 331c038a58cSDavid Howells _leave(" = 0"); 332c038a58cSDavid Howells return 0; 333c038a58cSDavid Howells 334c038a58cSDavid Howells error: 335c038a58cSDavid Howells rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 336c038a58cSDavid Howells RX_CALL_DEAD, ret); 337c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 338c038a58cSDavid Howells here, ERR_PTR(ret)); 339c038a58cSDavid Howells _leave(" = %d", ret); 340c038a58cSDavid Howells return ret; 341c038a58cSDavid Howells } 342c038a58cSDavid Howells 343c038a58cSDavid Howells /* 344248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 345248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3468c3e34a4SDavid Howells */ 347248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 348248f219cSDavid Howells struct rxrpc_call *call, 34942886ffeSDavid Howells struct sk_buff *skb) 3508c3e34a4SDavid Howells { 351248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 35242886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 353248f219cSDavid Howells u32 chan; 3548c3e34a4SDavid Howells 355248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3568c3e34a4SDavid Howells 357248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 358248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 359248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 360248f219cSDavid Howells call->cid = sp->hdr.cid; 361248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 362248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 363248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 36457494343SDavid Howells call->cong_tstamp = skb->tstamp; 3658c3e34a4SDavid Howells 366248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 367248f219cSDavid Howells * only defending against the data_ready handler (which we're called 368248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 369248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 370248f219cSDavid Howells * call pointer). 3718c3e34a4SDavid Howells */ 372248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 373248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 374248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 375a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3768c3e34a4SDavid Howells 37785f32278SDavid Howells spin_lock(&conn->params.peer->lock); 37885f32278SDavid Howells hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 37985f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 3808c3e34a4SDavid Howells 3818c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 3828c3e34a4SDavid Howells 383248f219cSDavid Howells rxrpc_start_call_timer(call); 384248f219cSDavid Howells _leave(""); 3858c3e34a4SDavid Howells } 3868c3e34a4SDavid Howells 3878c3e34a4SDavid Howells /* 3888d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 3898d94aa38SDavid Howells */ 3908d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 3918d94aa38SDavid Howells { 3928d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3938d94aa38SDavid Howells int n = __atomic_add_unless(&call->usage, 1, 0); 3948d94aa38SDavid Howells if (n == 0) 3958d94aa38SDavid Howells return false; 3968d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3972ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 3988d94aa38SDavid Howells else 3998d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4008d94aa38SDavid Howells return true; 4018d94aa38SDavid Howells } 4028d94aa38SDavid Howells 4038d94aa38SDavid Howells /* 4048d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 4058d94aa38SDavid Howells */ 4068d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 4078d94aa38SDavid Howells { 4088d94aa38SDavid Howells const void *here = __builtin_return_address(0); 4098d94aa38SDavid Howells int n = atomic_read(&call->usage); 4108d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 4118d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 4122ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 4138d94aa38SDavid Howells else 4148d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4158d94aa38SDavid Howells return true; 4168d94aa38SDavid Howells } 4178d94aa38SDavid Howells 4188d94aa38SDavid Howells /* 419e34d4234SDavid Howells * Note the re-emergence of a call. 420e34d4234SDavid Howells */ 421e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 422e34d4234SDavid Howells { 423e34d4234SDavid Howells const void *here = __builtin_return_address(0); 424e34d4234SDavid Howells if (call) { 425e34d4234SDavid Howells int n = atomic_read(&call->usage); 426e34d4234SDavid Howells 4272ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 428e34d4234SDavid Howells } 429e34d4234SDavid Howells } 430e34d4234SDavid Howells 431e34d4234SDavid Howells /* 432e34d4234SDavid Howells * Note the addition of a ref on a call. 433e34d4234SDavid Howells */ 434fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 435e34d4234SDavid Howells { 436e34d4234SDavid Howells const void *here = __builtin_return_address(0); 437e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 438e34d4234SDavid Howells 4392ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 440e34d4234SDavid Howells } 441e34d4234SDavid Howells 442e34d4234SDavid Howells /* 443248f219cSDavid Howells * Detach a call from its owning socket. 4448c3e34a4SDavid Howells */ 4458d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4468c3e34a4SDavid Howells { 447a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 448248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 449248f219cSDavid Howells bool put = false; 450248f219cSDavid Howells int i; 451248f219cSDavid Howells 452248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 453248f219cSDavid Howells 454a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 455a84a46d7SDavid Howells here, (const void *)call->flags); 4568c3e34a4SDavid Howells 457a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 458e34d4234SDavid Howells 4598c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4608c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4618c3e34a4SDavid Howells BUG(); 4628c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4638c3e34a4SDavid Howells 464248f219cSDavid Howells del_timer_sync(&call->timer); 4658c3e34a4SDavid Howells 466248f219cSDavid Howells /* Make sure we don't get any more notifications */ 467248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 468e653cfe4SDavid Howells 469248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4708c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4718c3e34a4SDavid Howells call, call->events, call->flags); 472248f219cSDavid Howells list_del(&call->recvmsg_link); 473248f219cSDavid Howells put = true; 474248f219cSDavid Howells } 475248f219cSDavid Howells 476248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 477248f219cSDavid Howells call->recvmsg_link.next = NULL; 478248f219cSDavid Howells call->recvmsg_link.prev = NULL; 479248f219cSDavid Howells 480248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 481248f219cSDavid Howells if (put) 482248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 483248f219cSDavid Howells 484248f219cSDavid Howells write_lock(&rx->call_lock); 485248f219cSDavid Howells 486248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 4878c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 4888c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 4898d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 4908c3e34a4SDavid Howells } 4918c3e34a4SDavid Howells 492248f219cSDavid Howells list_del(&call->sock_link); 493248f219cSDavid Howells write_unlock(&rx->call_lock); 4948c3e34a4SDavid Howells 495248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 4968c3e34a4SDavid Howells 497248f219cSDavid Howells if (conn) 498e653cfe4SDavid Howells rxrpc_disconnect_call(call); 499e653cfe4SDavid Howells 500248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 50171f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 50271f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 50371f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 504248f219cSDavid Howells call->rxtx_buffer[i] = NULL; 5058c3e34a4SDavid Howells } 5068c3e34a4SDavid Howells 5078c3e34a4SDavid Howells _leave(""); 5088c3e34a4SDavid Howells } 5098c3e34a4SDavid Howells 5108c3e34a4SDavid Howells /* 511c038a58cSDavid Howells * Prepare a kernel service call for retry. 512c038a58cSDavid Howells */ 513c038a58cSDavid Howells int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call) 514c038a58cSDavid Howells { 515c038a58cSDavid Howells const void *here = __builtin_return_address(0); 516c038a58cSDavid Howells int i; 517c038a58cSDavid Howells u8 last = 0; 518c038a58cSDavid Howells 519c038a58cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 520c038a58cSDavid Howells 521c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 522c038a58cSDavid Howells here, (const void *)call->flags); 523c038a58cSDavid Howells 524c038a58cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 525c038a58cSDavid Howells ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED); 526c038a58cSDavid Howells ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED); 527c038a58cSDavid Howells ASSERT(list_empty(&call->recvmsg_link)); 528c038a58cSDavid Howells 529c038a58cSDavid Howells del_timer_sync(&call->timer); 530c038a58cSDavid Howells 531c038a58cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn); 532c038a58cSDavid Howells 533c038a58cSDavid Howells if (call->conn) 534c038a58cSDavid Howells rxrpc_disconnect_call(call); 535c038a58cSDavid Howells 536c038a58cSDavid Howells if (rxrpc_is_service_call(call) || 537c038a58cSDavid Howells !call->tx_phase || 538c038a58cSDavid Howells call->tx_hard_ack != 0 || 539c038a58cSDavid Howells call->rx_hard_ack != 0 || 540c038a58cSDavid Howells call->rx_top != 0) 541c038a58cSDavid Howells return -EINVAL; 542c038a58cSDavid Howells 543c038a58cSDavid Howells call->state = RXRPC_CALL_UNINITIALISED; 544c038a58cSDavid Howells call->completion = RXRPC_CALL_SUCCEEDED; 545c038a58cSDavid Howells call->call_id = 0; 546c038a58cSDavid Howells call->cid = 0; 547c038a58cSDavid Howells call->cong_cwnd = 0; 548c038a58cSDavid Howells call->cong_extra = 0; 549c038a58cSDavid Howells call->cong_ssthresh = 0; 550c038a58cSDavid Howells call->cong_mode = 0; 551c038a58cSDavid Howells call->cong_dup_acks = 0; 552c038a58cSDavid Howells call->cong_cumul_acks = 0; 553c038a58cSDavid Howells call->acks_lowest_nak = 0; 554c038a58cSDavid Howells 555c038a58cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 556c038a58cSDavid Howells last |= call->rxtx_annotations[i]; 557c038a58cSDavid Howells call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST; 558c038a58cSDavid Howells call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS; 559c038a58cSDavid Howells } 560c038a58cSDavid Howells 561c038a58cSDavid Howells _leave(" = 0"); 562c038a58cSDavid Howells return 0; 563c038a58cSDavid Howells } 564c038a58cSDavid Howells 565c038a58cSDavid Howells /* 5668c3e34a4SDavid Howells * release all the calls associated with a socket 5678c3e34a4SDavid Howells */ 5688c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 5698c3e34a4SDavid Howells { 5708c3e34a4SDavid Howells struct rxrpc_call *call; 5718c3e34a4SDavid Howells 5728c3e34a4SDavid Howells _enter("%p", rx); 5738c3e34a4SDavid Howells 5740360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 5750360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 5760360da6dSDavid Howells struct rxrpc_call, accept_link); 5770360da6dSDavid Howells list_del(&call->accept_link); 5783a92789aSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 5790360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5800360da6dSDavid Howells } 5810360da6dSDavid Howells 582248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 583248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 584248f219cSDavid Howells struct rxrpc_call, sock_link); 585248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 5863a92789aSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 58726cb02aaSDavid Howells rxrpc_send_abort_packet(call); 5888d94aa38SDavid Howells rxrpc_release_call(rx, call); 589248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5908c3e34a4SDavid Howells } 5918c3e34a4SDavid Howells 5928c3e34a4SDavid Howells _leave(""); 5938c3e34a4SDavid Howells } 5948c3e34a4SDavid Howells 5958c3e34a4SDavid Howells /* 5968c3e34a4SDavid Howells * release a call 5978c3e34a4SDavid Howells */ 598fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 5998c3e34a4SDavid Howells { 6002baec2c3SDavid Howells struct rxrpc_net *rxnet; 601e34d4234SDavid Howells const void *here = __builtin_return_address(0); 6022ab27215SDavid Howells int n; 603e34d4234SDavid Howells 6048c3e34a4SDavid Howells ASSERT(call != NULL); 6058c3e34a4SDavid Howells 606e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 6072ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 608e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 609e34d4234SDavid Howells if (n == 0) { 6108c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 611248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 612e34d4234SDavid Howells 6132baec2c3SDavid Howells if (!list_empty(&call->link)) { 6142baec2c3SDavid Howells rxnet = rxrpc_net(sock_net(&call->socket->sk)); 6152baec2c3SDavid Howells write_lock(&rxnet->call_lock); 616248f219cSDavid Howells list_del_init(&call->link); 6172baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 6182baec2c3SDavid Howells } 619e34d4234SDavid Howells 6208d94aa38SDavid Howells rxrpc_cleanup_call(call); 621e34d4234SDavid Howells } 6228c3e34a4SDavid Howells } 6238c3e34a4SDavid Howells 6248c3e34a4SDavid Howells /* 625dee46364SDavid Howells * Final call destruction under RCU. 626dee46364SDavid Howells */ 627dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 628dee46364SDavid Howells { 629dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 630dee46364SDavid Howells 631df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 632248f219cSDavid Howells kfree(call->rxtx_buffer); 633248f219cSDavid Howells kfree(call->rxtx_annotations); 634dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 635dee46364SDavid Howells } 636dee46364SDavid Howells 637dee46364SDavid Howells /* 6388c3e34a4SDavid Howells * clean up a call 6398c3e34a4SDavid Howells */ 64000e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 6418c3e34a4SDavid Howells { 642248f219cSDavid Howells int i; 6438c3e34a4SDavid Howells 644248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 6458c3e34a4SDavid Howells 6468c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 6478c3e34a4SDavid Howells 648248f219cSDavid Howells del_timer_sync(&call->timer); 6498c3e34a4SDavid Howells 6508d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 6518c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 652e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 6538c3e34a4SDavid Howells 654248f219cSDavid Howells /* Clean up the Rx/Tx buffer */ 655248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 65671f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 65771f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 65871f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 6598c3e34a4SDavid Howells 66071f3ca40SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 6618c3e34a4SDavid Howells 662dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 6638c3e34a4SDavid Howells } 6648c3e34a4SDavid Howells 6658c3e34a4SDavid Howells /* 6662baec2c3SDavid Howells * Make sure that all calls are gone from a network namespace. To reach this 6672baec2c3SDavid Howells * point, any open UDP sockets in that namespace must have been closed, so any 6682baec2c3SDavid Howells * outstanding calls cannot be doing I/O. 6698c3e34a4SDavid Howells */ 6702baec2c3SDavid Howells void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 6718c3e34a4SDavid Howells { 6728c3e34a4SDavid Howells struct rxrpc_call *call; 6738c3e34a4SDavid Howells 6748c3e34a4SDavid Howells _enter(""); 6758d94aa38SDavid Howells 6762baec2c3SDavid Howells if (list_empty(&rxnet->calls)) 6778d94aa38SDavid Howells return; 6788d94aa38SDavid Howells 6792baec2c3SDavid Howells write_lock(&rxnet->call_lock); 6808c3e34a4SDavid Howells 6812baec2c3SDavid Howells while (!list_empty(&rxnet->calls)) { 6822baec2c3SDavid Howells call = list_entry(rxnet->calls.next, struct rxrpc_call, link); 6838c3e34a4SDavid Howells _debug("Zapping call %p", call); 6848c3e34a4SDavid Howells 685e34d4234SDavid Howells rxrpc_see_call(call); 6868c3e34a4SDavid Howells list_del_init(&call->link); 6878c3e34a4SDavid Howells 688248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 6898c3e34a4SDavid Howells call, atomic_read(&call->usage), 6908c3e34a4SDavid Howells rxrpc_call_states[call->state], 6918c3e34a4SDavid Howells call->flags, call->events); 6928c3e34a4SDavid Howells 6932baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 6948c3e34a4SDavid Howells cond_resched(); 6952baec2c3SDavid Howells write_lock(&rxnet->call_lock); 6968c3e34a4SDavid Howells } 6978c3e34a4SDavid Howells 6982baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 6998c3e34a4SDavid Howells } 700