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; 1068c3e34a4SDavid Howells 1078c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1088c3e34a4SDavid Howells if (!call) 1098c3e34a4SDavid Howells return NULL; 1108c3e34a4SDavid Howells 111248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 112248f219cSDavid Howells sizeof(struct sk_buff *), 1138c3e34a4SDavid Howells gfp); 114248f219cSDavid Howells if (!call->rxtx_buffer) 115248f219cSDavid Howells goto nomem; 1168c3e34a4SDavid Howells 117248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 118248f219cSDavid Howells if (!call->rxtx_annotations) 119248f219cSDavid Howells goto nomem_2; 120248f219cSDavid Howells 121540b1c48SDavid Howells mutex_init(&call->user_mutex); 1229faaff59SDavid Howells 1239faaff59SDavid Howells /* Prevent lockdep reporting a deadlock false positive between the afs 1249faaff59SDavid Howells * filesystem and sys_sendmsg() via the mmap sem. 1259faaff59SDavid Howells */ 1269faaff59SDavid Howells if (rx->sk.sk_kern_sock) 1279faaff59SDavid Howells lockdep_set_class(&call->user_mutex, 1289faaff59SDavid Howells &rxrpc_call_user_mutex_lock_class_key); 1299faaff59SDavid Howells 130e99e88a9SKees Cook timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 1318c3e34a4SDavid Howells INIT_WORK(&call->processor, &rxrpc_process_call); 132999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 13345025bceSDavid Howells INIT_LIST_HEAD(&call->chan_wait_link); 1348c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 135248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 136248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 13745025bceSDavid Howells init_waitqueue_head(&call->waitq); 1388c3e34a4SDavid Howells spin_lock_init(&call->lock); 13920acbd9aSDavid Howells spin_lock_init(&call->notify_lock); 1408c3e34a4SDavid Howells rwlock_init(&call->state_lock); 1418c3e34a4SDavid Howells atomic_set(&call->usage, 1); 142a25e21f0SDavid Howells call->debug_id = debug_id; 143e754eba6SDavid Howells call->tx_total_len = -1; 144a158bdd3SDavid Howells call->next_rx_timo = 20 * HZ; 145a158bdd3SDavid Howells call->next_req_timo = 1 * HZ; 1468c3e34a4SDavid Howells 1478c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1488c3e34a4SDavid Howells 149248f219cSDavid Howells /* Leave space in the ring to handle a maxed-out jumbo packet */ 15075e42126SDavid Howells call->rx_winsize = rxrpc_rx_window_size; 151248f219cSDavid Howells call->tx_winsize = 16; 152248f219cSDavid Howells call->rx_expect_next = 1; 15357494343SDavid Howells 15457494343SDavid Howells call->cong_cwnd = 2; 15557494343SDavid Howells call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 1568c3e34a4SDavid Howells return call; 157248f219cSDavid Howells 158248f219cSDavid Howells nomem_2: 159248f219cSDavid Howells kfree(call->rxtx_buffer); 160248f219cSDavid Howells nomem: 161248f219cSDavid Howells kmem_cache_free(rxrpc_call_jar, call); 162248f219cSDavid Howells return NULL; 1638c3e34a4SDavid Howells } 1648c3e34a4SDavid Howells 1658c3e34a4SDavid Howells /* 166999b69f8SDavid Howells * Allocate a new client call. 1678c3e34a4SDavid Howells */ 1689faaff59SDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 1699faaff59SDavid Howells struct sockaddr_rxrpc *srx, 170a25e21f0SDavid Howells gfp_t gfp, 171a25e21f0SDavid Howells unsigned int debug_id) 1728c3e34a4SDavid Howells { 1738c3e34a4SDavid Howells struct rxrpc_call *call; 17457494343SDavid Howells ktime_t now; 1758c3e34a4SDavid Howells 1768c3e34a4SDavid Howells _enter(""); 1778c3e34a4SDavid Howells 178a25e21f0SDavid Howells call = rxrpc_alloc_call(rx, gfp, debug_id); 1798c3e34a4SDavid Howells if (!call) 1808c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 181999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 182999b69f8SDavid Howells call->service_id = srx->srx_service; 18371f3ca40SDavid Howells call->tx_phase = true; 18457494343SDavid Howells now = ktime_get_real(); 18557494343SDavid Howells call->acks_latest_ts = now; 18657494343SDavid Howells call->cong_tstamp = now; 187999b69f8SDavid Howells 188999b69f8SDavid Howells _leave(" = %p", call); 189999b69f8SDavid Howells return call; 190999b69f8SDavid Howells } 191999b69f8SDavid Howells 192999b69f8SDavid Howells /* 193248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 194999b69f8SDavid Howells */ 195248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 196999b69f8SDavid Howells { 197a158bdd3SDavid Howells unsigned long now = jiffies; 198a158bdd3SDavid Howells unsigned long j = now + MAX_JIFFY_OFFSET; 199999b69f8SDavid Howells 200a158bdd3SDavid Howells call->ack_at = j; 201bd1fdf8cSDavid Howells call->ack_lost_at = j; 202a158bdd3SDavid Howells call->resend_at = j; 203a158bdd3SDavid Howells call->ping_at = j; 204a158bdd3SDavid Howells call->expect_rx_by = j; 205a158bdd3SDavid Howells call->expect_req_by = j; 206a158bdd3SDavid Howells call->expect_term_by = j; 207a158bdd3SDavid Howells call->timer.expires = now; 2088c3e34a4SDavid Howells } 2098c3e34a4SDavid Howells 2108c3e34a4SDavid Howells /* 211540b1c48SDavid Howells * Set up a call for the given parameters. 212540b1c48SDavid Howells * - Called with the socket lock held, which it must release. 213540b1c48SDavid Howells * - If it returns a call, the call's lock will need releasing by the caller. 2148c3e34a4SDavid Howells */ 2158c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 21619ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 217999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 21848124178SDavid Howells struct rxrpc_call_params *p, 219a25e21f0SDavid Howells gfp_t gfp, 220a25e21f0SDavid Howells unsigned int debug_id) 221540b1c48SDavid Howells __releases(&rx->sk.sk_lock.slock) 22288f2a825SDavid Howells __acquires(&call->user_mutex) 2238c3e34a4SDavid Howells { 2248c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 2252baec2c3SDavid Howells struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 2268c3e34a4SDavid Howells struct rb_node *parent, **pp; 227e34d4234SDavid Howells const void *here = __builtin_return_address(0); 228999b69f8SDavid Howells int ret; 2298c3e34a4SDavid Howells 23048124178SDavid Howells _enter("%p,%lx", rx, p->user_call_ID); 2318c3e34a4SDavid Howells 232a25e21f0SDavid Howells call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); 2338c3e34a4SDavid Howells if (IS_ERR(call)) { 234540b1c48SDavid Howells release_sock(&rx->sk); 2358c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2368c3e34a4SDavid Howells return call; 2378c3e34a4SDavid Howells } 2388c3e34a4SDavid Howells 23948124178SDavid Howells call->tx_total_len = p->tx_total_len; 240a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 24148124178SDavid Howells here, (const void *)p->user_call_ID); 242e34d4234SDavid Howells 243540b1c48SDavid Howells /* We need to protect a partially set up call against the user as we 244540b1c48SDavid Howells * will be acting outside the socket lock. 245540b1c48SDavid Howells */ 246540b1c48SDavid Howells mutex_lock(&call->user_mutex); 247540b1c48SDavid Howells 248999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2498c3e34a4SDavid Howells write_lock(&rx->call_lock); 2508c3e34a4SDavid Howells 2518c3e34a4SDavid Howells pp = &rx->calls.rb_node; 2528c3e34a4SDavid Howells parent = NULL; 2538c3e34a4SDavid Howells while (*pp) { 2548c3e34a4SDavid Howells parent = *pp; 2558c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 2568c3e34a4SDavid Howells 25748124178SDavid Howells if (p->user_call_ID < xcall->user_call_ID) 2588c3e34a4SDavid Howells pp = &(*pp)->rb_left; 25948124178SDavid Howells else if (p->user_call_ID > xcall->user_call_ID) 2608c3e34a4SDavid Howells pp = &(*pp)->rb_right; 2618c3e34a4SDavid Howells else 262357f5ef6SDavid Howells goto error_dup_user_ID; 2638c3e34a4SDavid Howells } 2648c3e34a4SDavid Howells 265248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 26648124178SDavid Howells call->user_call_ID = p->user_call_ID; 267357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 268fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2698c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2708c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 271248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 272248f219cSDavid Howells 2738c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2748c3e34a4SDavid Howells 2752baec2c3SDavid Howells write_lock(&rxnet->call_lock); 2762baec2c3SDavid Howells list_add_tail(&call->link, &rxnet->calls); 2772baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 2788c3e34a4SDavid Howells 279540b1c48SDavid Howells /* From this point on, the call is protected by its own lock. */ 280540b1c48SDavid Howells release_sock(&rx->sk); 281540b1c48SDavid Howells 282248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 283248f219cSDavid Howells * including channel number and call ID. 284248f219cSDavid Howells */ 285248f219cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 286999b69f8SDavid Howells if (ret < 0) 287999b69f8SDavid Howells goto error; 288999b69f8SDavid Howells 289a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 29054fde423SDavid Howells here, NULL); 291a84a46d7SDavid Howells 292248f219cSDavid Howells rxrpc_start_call_timer(call); 293248f219cSDavid Howells 2948c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 2958c3e34a4SDavid Howells 2968c3e34a4SDavid Howells _leave(" = %p [new]", call); 2978c3e34a4SDavid Howells return call; 2988c3e34a4SDavid Howells 2998c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 3008c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 3018c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 3028c3e34a4SDavid Howells * same time in different threads. 3038c3e34a4SDavid Howells */ 304357f5ef6SDavid Howells error_dup_user_ID: 3058c3e34a4SDavid Howells write_unlock(&rx->call_lock); 306540b1c48SDavid Howells release_sock(&rx->sk); 3078d94aa38SDavid Howells ret = -EEXIST; 308357f5ef6SDavid Howells 309357f5ef6SDavid Howells error: 310357f5ef6SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 311357f5ef6SDavid Howells RX_CALL_DEAD, ret); 312a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 313a84a46d7SDavid Howells here, ERR_PTR(ret)); 314357f5ef6SDavid Howells rxrpc_release_call(rx, call); 315540b1c48SDavid Howells mutex_unlock(&call->user_mutex); 316357f5ef6SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 317357f5ef6SDavid Howells _leave(" = %d", ret); 318357f5ef6SDavid Howells return ERR_PTR(ret); 3198c3e34a4SDavid Howells } 3208c3e34a4SDavid Howells 3218c3e34a4SDavid Howells /* 322c038a58cSDavid Howells * Retry a call to a new address. It is expected that the Tx queue of the call 323c038a58cSDavid Howells * will contain data previously packaged for an old call. 324c038a58cSDavid Howells */ 325c038a58cSDavid Howells int rxrpc_retry_client_call(struct rxrpc_sock *rx, 326c038a58cSDavid Howells struct rxrpc_call *call, 327c038a58cSDavid Howells struct rxrpc_conn_parameters *cp, 328c038a58cSDavid Howells struct sockaddr_rxrpc *srx, 329c038a58cSDavid Howells gfp_t gfp) 330c038a58cSDavid Howells { 331c038a58cSDavid Howells const void *here = __builtin_return_address(0); 332c038a58cSDavid Howells int ret; 333c038a58cSDavid Howells 334c038a58cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 335c038a58cSDavid Howells * including channel number and call ID. 336c038a58cSDavid Howells */ 337c038a58cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 338c038a58cSDavid Howells if (ret < 0) 339c038a58cSDavid Howells goto error; 340c038a58cSDavid Howells 341c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 342c038a58cSDavid Howells here, NULL); 343c038a58cSDavid Howells 344c038a58cSDavid Howells rxrpc_start_call_timer(call); 345c038a58cSDavid Howells 346c038a58cSDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 347c038a58cSDavid Howells 348c038a58cSDavid Howells if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 349c038a58cSDavid Howells rxrpc_queue_call(call); 350c038a58cSDavid Howells 351c038a58cSDavid Howells _leave(" = 0"); 352c038a58cSDavid Howells return 0; 353c038a58cSDavid Howells 354c038a58cSDavid Howells error: 355c038a58cSDavid Howells rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 356c038a58cSDavid Howells RX_CALL_DEAD, ret); 357c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 358c038a58cSDavid Howells here, ERR_PTR(ret)); 359c038a58cSDavid Howells _leave(" = %d", ret); 360c038a58cSDavid Howells return ret; 361c038a58cSDavid Howells } 362c038a58cSDavid Howells 363c038a58cSDavid Howells /* 364248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 365248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3668c3e34a4SDavid Howells */ 367248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 368248f219cSDavid Howells struct rxrpc_call *call, 36942886ffeSDavid Howells struct sk_buff *skb) 3708c3e34a4SDavid Howells { 371248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 37242886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 373248f219cSDavid Howells u32 chan; 3748c3e34a4SDavid Howells 375248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3768c3e34a4SDavid Howells 377248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 378248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 379248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 380248f219cSDavid Howells call->cid = sp->hdr.cid; 381248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 382248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 383248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 38457494343SDavid Howells call->cong_tstamp = skb->tstamp; 3858c3e34a4SDavid Howells 386248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 387248f219cSDavid Howells * only defending against the data_ready handler (which we're called 388248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 389248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 390248f219cSDavid Howells * call pointer). 3918c3e34a4SDavid Howells */ 392248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 393248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 394248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 395a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3968c3e34a4SDavid Howells 39785f32278SDavid Howells spin_lock(&conn->params.peer->lock); 39885f32278SDavid Howells hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 39985f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 4008c3e34a4SDavid Howells 4018c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 4028c3e34a4SDavid Howells 403248f219cSDavid Howells rxrpc_start_call_timer(call); 404248f219cSDavid Howells _leave(""); 4058c3e34a4SDavid Howells } 4068c3e34a4SDavid Howells 4078c3e34a4SDavid Howells /* 4088d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 4098d94aa38SDavid Howells */ 4108d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 4118d94aa38SDavid Howells { 4128d94aa38SDavid Howells const void *here = __builtin_return_address(0); 4138d94aa38SDavid Howells int n = __atomic_add_unless(&call->usage, 1, 0); 4148d94aa38SDavid Howells if (n == 0) 4158d94aa38SDavid Howells return false; 4168d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 4172ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 4188d94aa38SDavid Howells else 4198d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4208d94aa38SDavid Howells return true; 4218d94aa38SDavid Howells } 4228d94aa38SDavid Howells 4238d94aa38SDavid Howells /* 4248d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 4258d94aa38SDavid Howells */ 4268d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 4278d94aa38SDavid Howells { 4288d94aa38SDavid Howells const void *here = __builtin_return_address(0); 4298d94aa38SDavid Howells int n = atomic_read(&call->usage); 4308d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 4318d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 4322ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 4338d94aa38SDavid Howells else 4348d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4358d94aa38SDavid Howells return true; 4368d94aa38SDavid Howells } 4378d94aa38SDavid Howells 4388d94aa38SDavid Howells /* 439e34d4234SDavid Howells * Note the re-emergence of a call. 440e34d4234SDavid Howells */ 441e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 442e34d4234SDavid Howells { 443e34d4234SDavid Howells const void *here = __builtin_return_address(0); 444e34d4234SDavid Howells if (call) { 445e34d4234SDavid Howells int n = atomic_read(&call->usage); 446e34d4234SDavid Howells 4472ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 448e34d4234SDavid Howells } 449e34d4234SDavid Howells } 450e34d4234SDavid Howells 451e34d4234SDavid Howells /* 452e34d4234SDavid Howells * Note the addition of a ref on a call. 453e34d4234SDavid Howells */ 454fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 455e34d4234SDavid Howells { 456e34d4234SDavid Howells const void *here = __builtin_return_address(0); 457e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 458e34d4234SDavid Howells 4592ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 460e34d4234SDavid Howells } 461e34d4234SDavid Howells 462e34d4234SDavid Howells /* 463248f219cSDavid Howells * Detach a call from its owning socket. 4648c3e34a4SDavid Howells */ 4658d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4668c3e34a4SDavid Howells { 467a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 468248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 469248f219cSDavid Howells bool put = false; 470248f219cSDavid Howells int i; 471248f219cSDavid Howells 472248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 473248f219cSDavid Howells 474a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 475a84a46d7SDavid Howells here, (const void *)call->flags); 4768c3e34a4SDavid Howells 477a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 478e34d4234SDavid Howells 4798c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4808c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4818c3e34a4SDavid Howells BUG(); 4828c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4838c3e34a4SDavid Howells 484248f219cSDavid Howells del_timer_sync(&call->timer); 4858c3e34a4SDavid Howells 486248f219cSDavid Howells /* Make sure we don't get any more notifications */ 487248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 488e653cfe4SDavid Howells 489248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4908c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4918c3e34a4SDavid Howells call, call->events, call->flags); 492248f219cSDavid Howells list_del(&call->recvmsg_link); 493248f219cSDavid Howells put = true; 494248f219cSDavid Howells } 495248f219cSDavid Howells 496248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 497248f219cSDavid Howells call->recvmsg_link.next = NULL; 498248f219cSDavid Howells call->recvmsg_link.prev = NULL; 499248f219cSDavid Howells 500248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 501248f219cSDavid Howells if (put) 502248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 503248f219cSDavid Howells 504248f219cSDavid Howells write_lock(&rx->call_lock); 505248f219cSDavid Howells 506248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 5078c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 5088c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 5098d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 5108c3e34a4SDavid Howells } 5118c3e34a4SDavid Howells 512248f219cSDavid Howells list_del(&call->sock_link); 513248f219cSDavid Howells write_unlock(&rx->call_lock); 5148c3e34a4SDavid Howells 515248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 5168c3e34a4SDavid Howells 517248f219cSDavid Howells if (conn) 518e653cfe4SDavid Howells rxrpc_disconnect_call(call); 519e653cfe4SDavid Howells 520248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 52171f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 52271f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 52371f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 524248f219cSDavid Howells call->rxtx_buffer[i] = NULL; 5258c3e34a4SDavid Howells } 5268c3e34a4SDavid Howells 5278c3e34a4SDavid Howells _leave(""); 5288c3e34a4SDavid Howells } 5298c3e34a4SDavid Howells 5308c3e34a4SDavid Howells /* 531c038a58cSDavid Howells * Prepare a kernel service call for retry. 532c038a58cSDavid Howells */ 533c038a58cSDavid Howells int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call) 534c038a58cSDavid Howells { 535c038a58cSDavid Howells const void *here = __builtin_return_address(0); 536c038a58cSDavid Howells int i; 537c038a58cSDavid Howells u8 last = 0; 538c038a58cSDavid Howells 539c038a58cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 540c038a58cSDavid Howells 541c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 542c038a58cSDavid Howells here, (const void *)call->flags); 543c038a58cSDavid Howells 544c038a58cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 545c038a58cSDavid Howells ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED); 546c038a58cSDavid Howells ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED); 547c038a58cSDavid Howells ASSERT(list_empty(&call->recvmsg_link)); 548c038a58cSDavid Howells 549c038a58cSDavid Howells del_timer_sync(&call->timer); 550c038a58cSDavid Howells 551c038a58cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn); 552c038a58cSDavid Howells 553c038a58cSDavid Howells if (call->conn) 554c038a58cSDavid Howells rxrpc_disconnect_call(call); 555c038a58cSDavid Howells 556c038a58cSDavid Howells if (rxrpc_is_service_call(call) || 557c038a58cSDavid Howells !call->tx_phase || 558c038a58cSDavid Howells call->tx_hard_ack != 0 || 559c038a58cSDavid Howells call->rx_hard_ack != 0 || 560c038a58cSDavid Howells call->rx_top != 0) 561c038a58cSDavid Howells return -EINVAL; 562c038a58cSDavid Howells 563c038a58cSDavid Howells call->state = RXRPC_CALL_UNINITIALISED; 564c038a58cSDavid Howells call->completion = RXRPC_CALL_SUCCEEDED; 565c038a58cSDavid Howells call->call_id = 0; 566c038a58cSDavid Howells call->cid = 0; 567c038a58cSDavid Howells call->cong_cwnd = 0; 568c038a58cSDavid Howells call->cong_extra = 0; 569c038a58cSDavid Howells call->cong_ssthresh = 0; 570c038a58cSDavid Howells call->cong_mode = 0; 571c038a58cSDavid Howells call->cong_dup_acks = 0; 572c038a58cSDavid Howells call->cong_cumul_acks = 0; 573c038a58cSDavid Howells call->acks_lowest_nak = 0; 574c038a58cSDavid Howells 575c038a58cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 576c038a58cSDavid Howells last |= call->rxtx_annotations[i]; 577c038a58cSDavid Howells call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST; 578c038a58cSDavid Howells call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS; 579c038a58cSDavid Howells } 580c038a58cSDavid Howells 581c038a58cSDavid Howells _leave(" = 0"); 582c038a58cSDavid Howells return 0; 583c038a58cSDavid Howells } 584c038a58cSDavid Howells 585c038a58cSDavid Howells /* 5868c3e34a4SDavid Howells * release all the calls associated with a socket 5878c3e34a4SDavid Howells */ 5888c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 5898c3e34a4SDavid Howells { 5908c3e34a4SDavid Howells struct rxrpc_call *call; 5918c3e34a4SDavid Howells 5928c3e34a4SDavid Howells _enter("%p", rx); 5938c3e34a4SDavid Howells 5940360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 5950360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 5960360da6dSDavid Howells struct rxrpc_call, accept_link); 5970360da6dSDavid Howells list_del(&call->accept_link); 5983a92789aSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 5990360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 6000360da6dSDavid Howells } 6010360da6dSDavid Howells 602248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 603248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 604248f219cSDavid Howells struct rxrpc_call, sock_link); 605248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 6063a92789aSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 60726cb02aaSDavid Howells rxrpc_send_abort_packet(call); 6088d94aa38SDavid Howells rxrpc_release_call(rx, call); 609248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 6108c3e34a4SDavid Howells } 6118c3e34a4SDavid Howells 6128c3e34a4SDavid Howells _leave(""); 6138c3e34a4SDavid Howells } 6148c3e34a4SDavid Howells 6158c3e34a4SDavid Howells /* 6168c3e34a4SDavid Howells * release a call 6178c3e34a4SDavid Howells */ 618fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 6198c3e34a4SDavid Howells { 6202baec2c3SDavid Howells struct rxrpc_net *rxnet; 621e34d4234SDavid Howells const void *here = __builtin_return_address(0); 6222ab27215SDavid Howells int n; 623e34d4234SDavid Howells 6248c3e34a4SDavid Howells ASSERT(call != NULL); 6258c3e34a4SDavid Howells 626e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 6272ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 628e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 629e34d4234SDavid Howells if (n == 0) { 6308c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 631248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 632e34d4234SDavid Howells 6332baec2c3SDavid Howells if (!list_empty(&call->link)) { 6342baec2c3SDavid Howells rxnet = rxrpc_net(sock_net(&call->socket->sk)); 6352baec2c3SDavid Howells write_lock(&rxnet->call_lock); 636248f219cSDavid Howells list_del_init(&call->link); 6372baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 6382baec2c3SDavid Howells } 639e34d4234SDavid Howells 6408d94aa38SDavid Howells rxrpc_cleanup_call(call); 641e34d4234SDavid Howells } 6428c3e34a4SDavid Howells } 6438c3e34a4SDavid Howells 6448c3e34a4SDavid Howells /* 645dee46364SDavid Howells * Final call destruction under RCU. 646dee46364SDavid Howells */ 647dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 648dee46364SDavid Howells { 649dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 650dee46364SDavid Howells 651df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 652248f219cSDavid Howells kfree(call->rxtx_buffer); 653248f219cSDavid Howells kfree(call->rxtx_annotations); 654dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 655dee46364SDavid Howells } 656dee46364SDavid Howells 657dee46364SDavid Howells /* 6588c3e34a4SDavid Howells * clean up a call 6598c3e34a4SDavid Howells */ 66000e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 6618c3e34a4SDavid Howells { 662248f219cSDavid Howells int i; 6638c3e34a4SDavid Howells 664248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 6658c3e34a4SDavid Howells 6668c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 6678c3e34a4SDavid Howells 668248f219cSDavid Howells del_timer_sync(&call->timer); 6698c3e34a4SDavid Howells 6708d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 6718c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 672e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 6738c3e34a4SDavid Howells 674248f219cSDavid Howells /* Clean up the Rx/Tx buffer */ 675248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 67671f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 67771f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 67871f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 6798c3e34a4SDavid Howells 68071f3ca40SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 6818c3e34a4SDavid Howells 682dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 6838c3e34a4SDavid Howells } 6848c3e34a4SDavid Howells 6858c3e34a4SDavid Howells /* 6862baec2c3SDavid Howells * Make sure that all calls are gone from a network namespace. To reach this 6872baec2c3SDavid Howells * point, any open UDP sockets in that namespace must have been closed, so any 6882baec2c3SDavid Howells * outstanding calls cannot be doing I/O. 6898c3e34a4SDavid Howells */ 6902baec2c3SDavid Howells void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 6918c3e34a4SDavid Howells { 6928c3e34a4SDavid Howells struct rxrpc_call *call; 6938c3e34a4SDavid Howells 6948c3e34a4SDavid Howells _enter(""); 6958d94aa38SDavid Howells 6962baec2c3SDavid Howells if (list_empty(&rxnet->calls)) 6978d94aa38SDavid Howells return; 6988d94aa38SDavid Howells 6992baec2c3SDavid Howells write_lock(&rxnet->call_lock); 7008c3e34a4SDavid Howells 7012baec2c3SDavid Howells while (!list_empty(&rxnet->calls)) { 7022baec2c3SDavid Howells call = list_entry(rxnet->calls.next, struct rxrpc_call, link); 7038c3e34a4SDavid Howells _debug("Zapping call %p", call); 7048c3e34a4SDavid Howells 705e34d4234SDavid Howells rxrpc_see_call(call); 7068c3e34a4SDavid Howells list_del_init(&call->link); 7078c3e34a4SDavid Howells 708248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 7098c3e34a4SDavid Howells call, atomic_read(&call->usage), 7108c3e34a4SDavid Howells rxrpc_call_states[call->state], 7118c3e34a4SDavid Howells call->flags, call->events); 7128c3e34a4SDavid Howells 7132baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 7148c3e34a4SDavid Howells cond_resched(); 7152baec2c3SDavid Howells write_lock(&rxnet->call_lock); 7168c3e34a4SDavid Howells } 7178c3e34a4SDavid Howells 7182baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 7198c3e34a4SDavid Howells } 720