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 54a158bdd3SDavid Howells if (call->state < RXRPC_CALL_COMPLETE) { 55a158bdd3SDavid Howells trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); 56a158bdd3SDavid Howells rxrpc_queue_call(call); 57fc7ab6d2SDavid Howells } 58248f219cSDavid Howells } 598c3e34a4SDavid Howells 609faaff59SDavid Howells static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 618c3e34a4SDavid Howells 628c3e34a4SDavid Howells /* 638c3e34a4SDavid Howells * find an extant server call 648c3e34a4SDavid Howells * - called in process context with IRQs enabled 658c3e34a4SDavid Howells */ 668c3e34a4SDavid Howells struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 678c3e34a4SDavid Howells unsigned long user_call_ID) 688c3e34a4SDavid Howells { 698c3e34a4SDavid Howells struct rxrpc_call *call; 708c3e34a4SDavid Howells struct rb_node *p; 718c3e34a4SDavid Howells 728c3e34a4SDavid Howells _enter("%p,%lx", rx, user_call_ID); 738c3e34a4SDavid Howells 748c3e34a4SDavid Howells read_lock(&rx->call_lock); 758c3e34a4SDavid Howells 768c3e34a4SDavid Howells p = rx->calls.rb_node; 778c3e34a4SDavid Howells while (p) { 788c3e34a4SDavid Howells call = rb_entry(p, struct rxrpc_call, sock_node); 798c3e34a4SDavid Howells 808c3e34a4SDavid Howells if (user_call_ID < call->user_call_ID) 818c3e34a4SDavid Howells p = p->rb_left; 828c3e34a4SDavid Howells else if (user_call_ID > call->user_call_ID) 838c3e34a4SDavid Howells p = p->rb_right; 848c3e34a4SDavid Howells else 858c3e34a4SDavid Howells goto found_extant_call; 868c3e34a4SDavid Howells } 878c3e34a4SDavid Howells 888c3e34a4SDavid Howells read_unlock(&rx->call_lock); 898c3e34a4SDavid Howells _leave(" = NULL"); 908c3e34a4SDavid Howells return NULL; 918c3e34a4SDavid Howells 928c3e34a4SDavid Howells found_extant_call: 93fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got); 948c3e34a4SDavid Howells read_unlock(&rx->call_lock); 958c3e34a4SDavid Howells _leave(" = %p [%d]", call, atomic_read(&call->usage)); 968c3e34a4SDavid Howells return call; 978c3e34a4SDavid Howells } 988c3e34a4SDavid Howells 998c3e34a4SDavid Howells /* 1008c3e34a4SDavid Howells * allocate a new call 1018c3e34a4SDavid Howells */ 102a25e21f0SDavid Howells struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 103a25e21f0SDavid Howells unsigned int debug_id) 1048c3e34a4SDavid Howells { 1058c3e34a4SDavid Howells struct rxrpc_call *call; 106d3be4d24SDavid Howells struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 1078c3e34a4SDavid Howells 1088c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1098c3e34a4SDavid Howells if (!call) 1108c3e34a4SDavid Howells return NULL; 1118c3e34a4SDavid Howells 112248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 113248f219cSDavid Howells sizeof(struct sk_buff *), 1148c3e34a4SDavid Howells gfp); 115248f219cSDavid Howells if (!call->rxtx_buffer) 116248f219cSDavid Howells goto nomem; 1178c3e34a4SDavid Howells 118248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 119248f219cSDavid Howells if (!call->rxtx_annotations) 120248f219cSDavid Howells goto nomem_2; 121248f219cSDavid Howells 122540b1c48SDavid Howells mutex_init(&call->user_mutex); 1239faaff59SDavid Howells 1249faaff59SDavid Howells /* Prevent lockdep reporting a deadlock false positive between the afs 1259faaff59SDavid Howells * filesystem and sys_sendmsg() via the mmap sem. 1269faaff59SDavid Howells */ 1279faaff59SDavid Howells if (rx->sk.sk_kern_sock) 1289faaff59SDavid Howells lockdep_set_class(&call->user_mutex, 1299faaff59SDavid Howells &rxrpc_call_user_mutex_lock_class_key); 1309faaff59SDavid Howells 131e99e88a9SKees Cook timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 1328c3e34a4SDavid Howells INIT_WORK(&call->processor, &rxrpc_process_call); 133999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 13445025bceSDavid Howells INIT_LIST_HEAD(&call->chan_wait_link); 1358c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 136248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 137248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 13845025bceSDavid Howells init_waitqueue_head(&call->waitq); 1398c3e34a4SDavid Howells spin_lock_init(&call->lock); 14020acbd9aSDavid Howells spin_lock_init(&call->notify_lock); 1418c3e34a4SDavid Howells rwlock_init(&call->state_lock); 1428c3e34a4SDavid Howells atomic_set(&call->usage, 1); 143a25e21f0SDavid Howells call->debug_id = debug_id; 144e754eba6SDavid Howells call->tx_total_len = -1; 145a158bdd3SDavid Howells call->next_rx_timo = 20 * HZ; 146a158bdd3SDavid Howells call->next_req_timo = 1 * HZ; 1478c3e34a4SDavid Howells 1488c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1498c3e34a4SDavid Howells 150248f219cSDavid Howells /* Leave space in the ring to handle a maxed-out jumbo packet */ 15175e42126SDavid Howells call->rx_winsize = rxrpc_rx_window_size; 152248f219cSDavid Howells call->tx_winsize = 16; 153248f219cSDavid Howells call->rx_expect_next = 1; 15457494343SDavid Howells 15557494343SDavid Howells call->cong_cwnd = 2; 15657494343SDavid Howells call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 157d3be4d24SDavid Howells 158d3be4d24SDavid Howells call->rxnet = rxnet; 159d3be4d24SDavid Howells atomic_inc(&rxnet->nr_calls); 1608c3e34a4SDavid Howells return call; 161248f219cSDavid Howells 162248f219cSDavid Howells nomem_2: 163248f219cSDavid Howells kfree(call->rxtx_buffer); 164248f219cSDavid Howells nomem: 165248f219cSDavid Howells kmem_cache_free(rxrpc_call_jar, call); 166248f219cSDavid Howells return NULL; 1678c3e34a4SDavid Howells } 1688c3e34a4SDavid Howells 1698c3e34a4SDavid Howells /* 170999b69f8SDavid Howells * Allocate a new client call. 1718c3e34a4SDavid Howells */ 1729faaff59SDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 1739faaff59SDavid Howells struct sockaddr_rxrpc *srx, 174a25e21f0SDavid Howells gfp_t gfp, 175a25e21f0SDavid Howells unsigned int debug_id) 1768c3e34a4SDavid Howells { 1778c3e34a4SDavid Howells struct rxrpc_call *call; 17857494343SDavid Howells ktime_t now; 1798c3e34a4SDavid Howells 1808c3e34a4SDavid Howells _enter(""); 1818c3e34a4SDavid Howells 182a25e21f0SDavid Howells call = rxrpc_alloc_call(rx, gfp, debug_id); 1838c3e34a4SDavid Howells if (!call) 1848c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 185999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 186999b69f8SDavid Howells call->service_id = srx->srx_service; 18771f3ca40SDavid Howells call->tx_phase = true; 18857494343SDavid Howells now = ktime_get_real(); 18957494343SDavid Howells call->acks_latest_ts = now; 19057494343SDavid Howells call->cong_tstamp = now; 191999b69f8SDavid Howells 192999b69f8SDavid Howells _leave(" = %p", call); 193999b69f8SDavid Howells return call; 194999b69f8SDavid Howells } 195999b69f8SDavid Howells 196999b69f8SDavid Howells /* 197248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 198999b69f8SDavid Howells */ 199248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 200999b69f8SDavid Howells { 201a158bdd3SDavid Howells unsigned long now = jiffies; 202a158bdd3SDavid Howells unsigned long j = now + MAX_JIFFY_OFFSET; 203999b69f8SDavid Howells 204a158bdd3SDavid Howells call->ack_at = j; 205bd1fdf8cSDavid Howells call->ack_lost_at = j; 206a158bdd3SDavid Howells call->resend_at = j; 207a158bdd3SDavid Howells call->ping_at = j; 208a158bdd3SDavid Howells call->expect_rx_by = j; 209a158bdd3SDavid Howells call->expect_req_by = j; 210a158bdd3SDavid Howells call->expect_term_by = j; 211a158bdd3SDavid Howells call->timer.expires = now; 2128c3e34a4SDavid Howells } 2138c3e34a4SDavid Howells 2148c3e34a4SDavid Howells /* 215540b1c48SDavid Howells * Set up a call for the given parameters. 216540b1c48SDavid Howells * - Called with the socket lock held, which it must release. 217540b1c48SDavid Howells * - If it returns a call, the call's lock will need releasing by the caller. 2188c3e34a4SDavid Howells */ 2198c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 22019ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 221999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 22248124178SDavid Howells struct rxrpc_call_params *p, 223a25e21f0SDavid Howells gfp_t gfp, 224a25e21f0SDavid Howells unsigned int debug_id) 225540b1c48SDavid Howells __releases(&rx->sk.sk_lock.slock) 22688f2a825SDavid Howells __acquires(&call->user_mutex) 2278c3e34a4SDavid Howells { 2288c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 229d3be4d24SDavid Howells struct rxrpc_net *rxnet; 2308c3e34a4SDavid Howells struct rb_node *parent, **pp; 231e34d4234SDavid Howells const void *here = __builtin_return_address(0); 232999b69f8SDavid Howells int ret; 2338c3e34a4SDavid Howells 23448124178SDavid Howells _enter("%p,%lx", rx, p->user_call_ID); 2358c3e34a4SDavid Howells 236a25e21f0SDavid Howells call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); 2378c3e34a4SDavid Howells if (IS_ERR(call)) { 238540b1c48SDavid Howells release_sock(&rx->sk); 2398c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2408c3e34a4SDavid Howells return call; 2418c3e34a4SDavid Howells } 2428c3e34a4SDavid Howells 24348124178SDavid Howells call->tx_total_len = p->tx_total_len; 244a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 24548124178SDavid Howells here, (const void *)p->user_call_ID); 246e34d4234SDavid Howells 247540b1c48SDavid Howells /* We need to protect a partially set up call against the user as we 248540b1c48SDavid Howells * will be acting outside the socket lock. 249540b1c48SDavid Howells */ 250540b1c48SDavid Howells mutex_lock(&call->user_mutex); 251540b1c48SDavid Howells 252999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2538c3e34a4SDavid Howells write_lock(&rx->call_lock); 2548c3e34a4SDavid Howells 2558c3e34a4SDavid Howells pp = &rx->calls.rb_node; 2568c3e34a4SDavid Howells parent = NULL; 2578c3e34a4SDavid Howells while (*pp) { 2588c3e34a4SDavid Howells parent = *pp; 2598c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 2608c3e34a4SDavid Howells 26148124178SDavid Howells if (p->user_call_ID < xcall->user_call_ID) 2628c3e34a4SDavid Howells pp = &(*pp)->rb_left; 26348124178SDavid Howells else if (p->user_call_ID > xcall->user_call_ID) 2648c3e34a4SDavid Howells pp = &(*pp)->rb_right; 2658c3e34a4SDavid Howells else 266357f5ef6SDavid Howells goto error_dup_user_ID; 2678c3e34a4SDavid Howells } 2688c3e34a4SDavid Howells 269248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 27048124178SDavid Howells call->user_call_ID = p->user_call_ID; 271357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 272fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2738c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2748c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 275248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 276248f219cSDavid Howells 2778c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2788c3e34a4SDavid Howells 279d3be4d24SDavid Howells rxnet = call->rxnet; 2802baec2c3SDavid Howells write_lock(&rxnet->call_lock); 2812baec2c3SDavid Howells list_add_tail(&call->link, &rxnet->calls); 2822baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 2838c3e34a4SDavid Howells 284540b1c48SDavid Howells /* From this point on, the call is protected by its own lock. */ 285540b1c48SDavid Howells release_sock(&rx->sk); 286540b1c48SDavid Howells 287248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 288248f219cSDavid Howells * including channel number and call ID. 289248f219cSDavid Howells */ 290248f219cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 291999b69f8SDavid Howells if (ret < 0) 292999b69f8SDavid Howells goto error; 293999b69f8SDavid Howells 294a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 29554fde423SDavid Howells here, NULL); 296a84a46d7SDavid Howells 297248f219cSDavid Howells rxrpc_start_call_timer(call); 298248f219cSDavid Howells 2998c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 3008c3e34a4SDavid Howells 3018c3e34a4SDavid Howells _leave(" = %p [new]", call); 3028c3e34a4SDavid Howells return call; 3038c3e34a4SDavid Howells 3048c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 3058c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 3068c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 3078c3e34a4SDavid Howells * same time in different threads. 3088c3e34a4SDavid Howells */ 309357f5ef6SDavid Howells error_dup_user_ID: 3108c3e34a4SDavid Howells write_unlock(&rx->call_lock); 311540b1c48SDavid Howells release_sock(&rx->sk); 3128d94aa38SDavid Howells ret = -EEXIST; 313357f5ef6SDavid Howells 314357f5ef6SDavid Howells error: 315357f5ef6SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 316357f5ef6SDavid Howells RX_CALL_DEAD, ret); 317a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 318a84a46d7SDavid Howells here, ERR_PTR(ret)); 319357f5ef6SDavid Howells rxrpc_release_call(rx, call); 320540b1c48SDavid Howells mutex_unlock(&call->user_mutex); 321357f5ef6SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 322357f5ef6SDavid Howells _leave(" = %d", ret); 323357f5ef6SDavid Howells return ERR_PTR(ret); 3248c3e34a4SDavid Howells } 3258c3e34a4SDavid Howells 3268c3e34a4SDavid Howells /* 327c038a58cSDavid Howells * Retry a call to a new address. It is expected that the Tx queue of the call 328c038a58cSDavid Howells * will contain data previously packaged for an old call. 329c038a58cSDavid Howells */ 330c038a58cSDavid Howells int rxrpc_retry_client_call(struct rxrpc_sock *rx, 331c038a58cSDavid Howells struct rxrpc_call *call, 332c038a58cSDavid Howells struct rxrpc_conn_parameters *cp, 333c038a58cSDavid Howells struct sockaddr_rxrpc *srx, 334c038a58cSDavid Howells gfp_t gfp) 335c038a58cSDavid Howells { 336c038a58cSDavid Howells const void *here = __builtin_return_address(0); 337c038a58cSDavid Howells int ret; 338c038a58cSDavid Howells 339c038a58cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 340c038a58cSDavid Howells * including channel number and call ID. 341c038a58cSDavid Howells */ 342c038a58cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 343c038a58cSDavid Howells if (ret < 0) 344c038a58cSDavid Howells goto error; 345c038a58cSDavid Howells 346c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 347c038a58cSDavid Howells here, NULL); 348c038a58cSDavid Howells 349c038a58cSDavid Howells rxrpc_start_call_timer(call); 350c038a58cSDavid Howells 351c038a58cSDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 352c038a58cSDavid Howells 353c038a58cSDavid Howells if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 354c038a58cSDavid Howells rxrpc_queue_call(call); 355c038a58cSDavid Howells 356c038a58cSDavid Howells _leave(" = 0"); 357c038a58cSDavid Howells return 0; 358c038a58cSDavid Howells 359c038a58cSDavid Howells error: 360c038a58cSDavid Howells rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 361c038a58cSDavid Howells RX_CALL_DEAD, ret); 362c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 363c038a58cSDavid Howells here, ERR_PTR(ret)); 364c038a58cSDavid Howells _leave(" = %d", ret); 365c038a58cSDavid Howells return ret; 366c038a58cSDavid Howells } 367c038a58cSDavid Howells 368c038a58cSDavid Howells /* 369248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 370248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3718c3e34a4SDavid Howells */ 372248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 373248f219cSDavid Howells struct rxrpc_call *call, 37442886ffeSDavid Howells struct sk_buff *skb) 3758c3e34a4SDavid Howells { 376248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 37742886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 378248f219cSDavid Howells u32 chan; 3798c3e34a4SDavid Howells 380248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3818c3e34a4SDavid Howells 382248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 383248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 384248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 385248f219cSDavid Howells call->cid = sp->hdr.cid; 386248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 387248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 388248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 38957494343SDavid Howells call->cong_tstamp = skb->tstamp; 3908c3e34a4SDavid Howells 391248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 392248f219cSDavid Howells * only defending against the data_ready handler (which we're called 393248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 394248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 395248f219cSDavid Howells * call pointer). 3968c3e34a4SDavid Howells */ 397248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 398248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 399248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 400a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 4018c3e34a4SDavid Howells 40285f32278SDavid Howells spin_lock(&conn->params.peer->lock); 40385f32278SDavid Howells hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 40485f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 4058c3e34a4SDavid Howells 4068c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 4078c3e34a4SDavid Howells 408248f219cSDavid Howells rxrpc_start_call_timer(call); 409248f219cSDavid Howells _leave(""); 4108c3e34a4SDavid Howells } 4118c3e34a4SDavid Howells 4128c3e34a4SDavid Howells /* 4138d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 4148d94aa38SDavid Howells */ 4158d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 4168d94aa38SDavid Howells { 4178d94aa38SDavid Howells const void *here = __builtin_return_address(0); 4188d94aa38SDavid Howells int n = __atomic_add_unless(&call->usage, 1, 0); 4198d94aa38SDavid Howells if (n == 0) 4208d94aa38SDavid Howells return false; 4218d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 4222ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 4238d94aa38SDavid Howells else 4248d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4258d94aa38SDavid Howells return true; 4268d94aa38SDavid Howells } 4278d94aa38SDavid Howells 4288d94aa38SDavid Howells /* 4298d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 4308d94aa38SDavid Howells */ 4318d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 4328d94aa38SDavid Howells { 4338d94aa38SDavid Howells const void *here = __builtin_return_address(0); 4348d94aa38SDavid Howells int n = atomic_read(&call->usage); 4358d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 4368d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 4372ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 4388d94aa38SDavid Howells else 4398d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4408d94aa38SDavid Howells return true; 4418d94aa38SDavid Howells } 4428d94aa38SDavid Howells 4438d94aa38SDavid Howells /* 444e34d4234SDavid Howells * Note the re-emergence of a call. 445e34d4234SDavid Howells */ 446e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 447e34d4234SDavid Howells { 448e34d4234SDavid Howells const void *here = __builtin_return_address(0); 449e34d4234SDavid Howells if (call) { 450e34d4234SDavid Howells int n = atomic_read(&call->usage); 451e34d4234SDavid Howells 4522ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 453e34d4234SDavid Howells } 454e34d4234SDavid Howells } 455e34d4234SDavid Howells 456e34d4234SDavid Howells /* 457e34d4234SDavid Howells * Note the addition of a ref on a call. 458e34d4234SDavid Howells */ 459fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 460e34d4234SDavid Howells { 461e34d4234SDavid Howells const void *here = __builtin_return_address(0); 462e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 463e34d4234SDavid Howells 4642ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 465e34d4234SDavid Howells } 466e34d4234SDavid Howells 467e34d4234SDavid Howells /* 468248f219cSDavid Howells * Detach a call from its owning socket. 4698c3e34a4SDavid Howells */ 4708d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4718c3e34a4SDavid Howells { 472a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 473248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 474248f219cSDavid Howells bool put = false; 475248f219cSDavid Howells int i; 476248f219cSDavid Howells 477248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 478248f219cSDavid Howells 479a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 480a84a46d7SDavid Howells here, (const void *)call->flags); 4818c3e34a4SDavid Howells 482a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 483e34d4234SDavid Howells 4848c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4858c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4868c3e34a4SDavid Howells BUG(); 4878c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4888c3e34a4SDavid Howells 489248f219cSDavid Howells del_timer_sync(&call->timer); 4908c3e34a4SDavid Howells 491248f219cSDavid Howells /* Make sure we don't get any more notifications */ 492248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 493e653cfe4SDavid Howells 494248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4958c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4968c3e34a4SDavid Howells call, call->events, call->flags); 497248f219cSDavid Howells list_del(&call->recvmsg_link); 498248f219cSDavid Howells put = true; 499248f219cSDavid Howells } 500248f219cSDavid Howells 501248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 502248f219cSDavid Howells call->recvmsg_link.next = NULL; 503248f219cSDavid Howells call->recvmsg_link.prev = NULL; 504248f219cSDavid Howells 505248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 506248f219cSDavid Howells if (put) 507248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 508248f219cSDavid Howells 509248f219cSDavid Howells write_lock(&rx->call_lock); 510248f219cSDavid Howells 511248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 5128c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 5138c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 5148d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 5158c3e34a4SDavid Howells } 5168c3e34a4SDavid Howells 517248f219cSDavid Howells list_del(&call->sock_link); 518248f219cSDavid Howells write_unlock(&rx->call_lock); 5198c3e34a4SDavid Howells 520248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 5218c3e34a4SDavid Howells 522248f219cSDavid Howells if (conn) 523e653cfe4SDavid Howells rxrpc_disconnect_call(call); 524e653cfe4SDavid Howells 525248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 52671f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 52771f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 52871f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 529248f219cSDavid Howells call->rxtx_buffer[i] = NULL; 5308c3e34a4SDavid Howells } 5318c3e34a4SDavid Howells 5328c3e34a4SDavid Howells _leave(""); 5338c3e34a4SDavid Howells } 5348c3e34a4SDavid Howells 5358c3e34a4SDavid Howells /* 536c038a58cSDavid Howells * Prepare a kernel service call for retry. 537c038a58cSDavid Howells */ 538c038a58cSDavid Howells int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call) 539c038a58cSDavid Howells { 540c038a58cSDavid Howells const void *here = __builtin_return_address(0); 541c038a58cSDavid Howells int i; 542c038a58cSDavid Howells u8 last = 0; 543c038a58cSDavid Howells 544c038a58cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 545c038a58cSDavid Howells 546c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 547c038a58cSDavid Howells here, (const void *)call->flags); 548c038a58cSDavid Howells 549c038a58cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 550c038a58cSDavid Howells ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED); 551c038a58cSDavid Howells ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED); 552c038a58cSDavid Howells ASSERT(list_empty(&call->recvmsg_link)); 553c038a58cSDavid Howells 554c038a58cSDavid Howells del_timer_sync(&call->timer); 555c038a58cSDavid Howells 556c038a58cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn); 557c038a58cSDavid Howells 558c038a58cSDavid Howells if (call->conn) 559c038a58cSDavid Howells rxrpc_disconnect_call(call); 560c038a58cSDavid Howells 561c038a58cSDavid Howells if (rxrpc_is_service_call(call) || 562c038a58cSDavid Howells !call->tx_phase || 563c038a58cSDavid Howells call->tx_hard_ack != 0 || 564c038a58cSDavid Howells call->rx_hard_ack != 0 || 565c038a58cSDavid Howells call->rx_top != 0) 566c038a58cSDavid Howells return -EINVAL; 567c038a58cSDavid Howells 568c038a58cSDavid Howells call->state = RXRPC_CALL_UNINITIALISED; 569c038a58cSDavid Howells call->completion = RXRPC_CALL_SUCCEEDED; 570c038a58cSDavid Howells call->call_id = 0; 571c038a58cSDavid Howells call->cid = 0; 572c038a58cSDavid Howells call->cong_cwnd = 0; 573c038a58cSDavid Howells call->cong_extra = 0; 574c038a58cSDavid Howells call->cong_ssthresh = 0; 575c038a58cSDavid Howells call->cong_mode = 0; 576c038a58cSDavid Howells call->cong_dup_acks = 0; 577c038a58cSDavid Howells call->cong_cumul_acks = 0; 578c038a58cSDavid Howells call->acks_lowest_nak = 0; 579c038a58cSDavid Howells 580c038a58cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 581c038a58cSDavid Howells last |= call->rxtx_annotations[i]; 582c038a58cSDavid Howells call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST; 583c038a58cSDavid Howells call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS; 584c038a58cSDavid Howells } 585c038a58cSDavid Howells 586c038a58cSDavid Howells _leave(" = 0"); 587c038a58cSDavid Howells return 0; 588c038a58cSDavid Howells } 589c038a58cSDavid Howells 590c038a58cSDavid Howells /* 5918c3e34a4SDavid Howells * release all the calls associated with a socket 5928c3e34a4SDavid Howells */ 5938c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 5948c3e34a4SDavid Howells { 5958c3e34a4SDavid Howells struct rxrpc_call *call; 5968c3e34a4SDavid Howells 5978c3e34a4SDavid Howells _enter("%p", rx); 5988c3e34a4SDavid Howells 5990360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 6000360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 6010360da6dSDavid Howells struct rxrpc_call, accept_link); 6020360da6dSDavid Howells list_del(&call->accept_link); 6033a92789aSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 6040360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 6050360da6dSDavid Howells } 6060360da6dSDavid Howells 607248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 608248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 609248f219cSDavid Howells struct rxrpc_call, sock_link); 610248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 6113a92789aSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 61226cb02aaSDavid Howells rxrpc_send_abort_packet(call); 6138d94aa38SDavid Howells rxrpc_release_call(rx, call); 614248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 6158c3e34a4SDavid Howells } 6168c3e34a4SDavid Howells 6178c3e34a4SDavid Howells _leave(""); 6188c3e34a4SDavid Howells } 6198c3e34a4SDavid Howells 6208c3e34a4SDavid Howells /* 6218c3e34a4SDavid Howells * release a call 6228c3e34a4SDavid Howells */ 623fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 6248c3e34a4SDavid Howells { 625d3be4d24SDavid Howells struct rxrpc_net *rxnet = call->rxnet; 626e34d4234SDavid Howells const void *here = __builtin_return_address(0); 6272ab27215SDavid Howells int n; 628e34d4234SDavid Howells 6298c3e34a4SDavid Howells ASSERT(call != NULL); 6308c3e34a4SDavid Howells 631e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 6322ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 633e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 634e34d4234SDavid Howells if (n == 0) { 6358c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 636248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 637e34d4234SDavid Howells 6382baec2c3SDavid Howells if (!list_empty(&call->link)) { 6392baec2c3SDavid Howells write_lock(&rxnet->call_lock); 640248f219cSDavid Howells list_del_init(&call->link); 6412baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 6422baec2c3SDavid Howells } 643e34d4234SDavid Howells 6448d94aa38SDavid Howells rxrpc_cleanup_call(call); 645e34d4234SDavid Howells } 6468c3e34a4SDavid Howells } 6478c3e34a4SDavid Howells 6488c3e34a4SDavid Howells /* 649dee46364SDavid Howells * Final call destruction under RCU. 650dee46364SDavid Howells */ 651dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 652dee46364SDavid Howells { 653dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 654d3be4d24SDavid Howells struct rxrpc_net *rxnet = call->rxnet; 655dee46364SDavid Howells 656df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 657248f219cSDavid Howells kfree(call->rxtx_buffer); 658248f219cSDavid Howells kfree(call->rxtx_annotations); 659dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 660d3be4d24SDavid Howells if (atomic_dec_and_test(&rxnet->nr_calls)) 661d3be4d24SDavid Howells wake_up_atomic_t(&rxnet->nr_calls); 662dee46364SDavid Howells } 663dee46364SDavid Howells 664dee46364SDavid Howells /* 6658c3e34a4SDavid Howells * clean up a call 6668c3e34a4SDavid Howells */ 66700e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 6688c3e34a4SDavid Howells { 669248f219cSDavid Howells int i; 6708c3e34a4SDavid Howells 671248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 6728c3e34a4SDavid Howells 6738c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 6748c3e34a4SDavid Howells 675248f219cSDavid Howells del_timer_sync(&call->timer); 6768c3e34a4SDavid Howells 6778d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 6788c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 679e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 6808c3e34a4SDavid Howells 681248f219cSDavid Howells /* Clean up the Rx/Tx buffer */ 682248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 68371f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 68471f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 68571f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 6868c3e34a4SDavid Howells 68771f3ca40SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 6888c3e34a4SDavid Howells 689dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 6908c3e34a4SDavid Howells } 6918c3e34a4SDavid Howells 6928c3e34a4SDavid Howells /* 6932baec2c3SDavid Howells * Make sure that all calls are gone from a network namespace. To reach this 6942baec2c3SDavid Howells * point, any open UDP sockets in that namespace must have been closed, so any 6952baec2c3SDavid Howells * outstanding calls cannot be doing I/O. 6968c3e34a4SDavid Howells */ 6972baec2c3SDavid Howells void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 6988c3e34a4SDavid Howells { 6998c3e34a4SDavid Howells struct rxrpc_call *call; 7008c3e34a4SDavid Howells 7018c3e34a4SDavid Howells _enter(""); 7028d94aa38SDavid Howells 7032baec2c3SDavid Howells if (list_empty(&rxnet->calls)) 7048d94aa38SDavid Howells return; 7058d94aa38SDavid Howells 7062baec2c3SDavid Howells write_lock(&rxnet->call_lock); 7078c3e34a4SDavid Howells 7082baec2c3SDavid Howells while (!list_empty(&rxnet->calls)) { 7092baec2c3SDavid Howells call = list_entry(rxnet->calls.next, struct rxrpc_call, link); 7108c3e34a4SDavid Howells _debug("Zapping call %p", call); 7118c3e34a4SDavid Howells 712e34d4234SDavid Howells rxrpc_see_call(call); 7138c3e34a4SDavid Howells list_del_init(&call->link); 7148c3e34a4SDavid Howells 715248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 7168c3e34a4SDavid Howells call, atomic_read(&call->usage), 7178c3e34a4SDavid Howells rxrpc_call_states[call->state], 7188c3e34a4SDavid Howells call->flags, call->events); 7198c3e34a4SDavid Howells 7202baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 7218c3e34a4SDavid Howells cond_resched(); 7222baec2c3SDavid Howells write_lock(&rxnet->call_lock); 7238c3e34a4SDavid Howells } 7248c3e34a4SDavid Howells 7252baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 726d3be4d24SDavid Howells 727d3be4d24SDavid Howells atomic_dec(&rxnet->nr_calls); 728d3be4d24SDavid Howells wait_on_atomic_t(&rxnet->nr_calls, atomic_t_wait, TASK_UNINTERRUPTIBLE); 7298c3e34a4SDavid Howells } 730