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 48248f219cSDavid Howells static void rxrpc_call_timer_expired(unsigned long _call) 49248f219cSDavid Howells { 50248f219cSDavid Howells struct rxrpc_call *call = (struct rxrpc_call *)_call; 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); 57a158bdd3SDavid Howells } 58fc7ab6d2SDavid Howells } 598c3e34a4SDavid Howells 609faaff59SDavid Howells static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 619faaff59SDavid 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 */ 1029faaff59SDavid Howells struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp) 1038c3e34a4SDavid Howells { 1048c3e34a4SDavid Howells struct rxrpc_call *call; 1058c3e34a4SDavid Howells 1068c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1078c3e34a4SDavid Howells if (!call) 1088c3e34a4SDavid Howells return NULL; 1098c3e34a4SDavid Howells 110248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 111248f219cSDavid Howells sizeof(struct sk_buff *), 1128c3e34a4SDavid Howells gfp); 113248f219cSDavid Howells if (!call->rxtx_buffer) 114248f219cSDavid Howells goto nomem; 1158c3e34a4SDavid Howells 116248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 117248f219cSDavid Howells if (!call->rxtx_annotations) 118248f219cSDavid Howells goto nomem_2; 119248f219cSDavid Howells 120540b1c48SDavid Howells mutex_init(&call->user_mutex); 1219faaff59SDavid Howells 1229faaff59SDavid Howells /* Prevent lockdep reporting a deadlock false positive between the afs 1239faaff59SDavid Howells * filesystem and sys_sendmsg() via the mmap sem. 1249faaff59SDavid Howells */ 1259faaff59SDavid Howells if (rx->sk.sk_kern_sock) 1269faaff59SDavid Howells lockdep_set_class(&call->user_mutex, 1279faaff59SDavid Howells &rxrpc_call_user_mutex_lock_class_key); 1289faaff59SDavid Howells 129248f219cSDavid Howells setup_timer(&call->timer, rxrpc_call_timer_expired, 1308c3e34a4SDavid Howells (unsigned long)call); 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); 1428c3e34a4SDavid Howells call->debug_id = atomic_inc_return(&rxrpc_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, 1708c3e34a4SDavid Howells gfp_t gfp) 1718c3e34a4SDavid Howells { 1728c3e34a4SDavid Howells struct rxrpc_call *call; 17357494343SDavid Howells ktime_t now; 1748c3e34a4SDavid Howells 1758c3e34a4SDavid Howells _enter(""); 1768c3e34a4SDavid Howells 1779faaff59SDavid Howells call = rxrpc_alloc_call(rx, gfp); 1788c3e34a4SDavid Howells if (!call) 1798c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 180999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 181999b69f8SDavid Howells call->service_id = srx->srx_service; 18271f3ca40SDavid Howells call->tx_phase = true; 18357494343SDavid Howells now = ktime_get_real(); 18457494343SDavid Howells call->acks_latest_ts = now; 18557494343SDavid Howells call->cong_tstamp = now; 186999b69f8SDavid Howells 187999b69f8SDavid Howells _leave(" = %p", call); 188999b69f8SDavid Howells return call; 189999b69f8SDavid Howells } 190999b69f8SDavid Howells 191999b69f8SDavid Howells /* 192248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 193999b69f8SDavid Howells */ 194248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 195999b69f8SDavid Howells { 196a158bdd3SDavid Howells unsigned long now = jiffies; 197a158bdd3SDavid Howells unsigned long j = now + MAX_JIFFY_OFFSET; 198999b69f8SDavid Howells 199a158bdd3SDavid Howells call->ack_at = j; 200a158bdd3SDavid Howells call->resend_at = j; 201a158bdd3SDavid Howells call->ping_at = j; 202a158bdd3SDavid Howells call->expect_rx_by = j; 203a158bdd3SDavid Howells call->expect_req_by = j; 204a158bdd3SDavid Howells call->expect_term_by = j; 205a158bdd3SDavid Howells call->timer.expires = now; 2068c3e34a4SDavid Howells } 2078c3e34a4SDavid Howells 2088c3e34a4SDavid Howells /* 209540b1c48SDavid Howells * Set up a call for the given parameters. 210540b1c48SDavid Howells * - Called with the socket lock held, which it must release. 211540b1c48SDavid Howells * - If it returns a call, the call's lock will need releasing by the caller. 2128c3e34a4SDavid Howells */ 2138c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 21419ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 215999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 21648124178SDavid Howells struct rxrpc_call_params *p, 2178c3e34a4SDavid Howells gfp_t gfp) 218540b1c48SDavid Howells __releases(&rx->sk.sk_lock.slock) 2198c3e34a4SDavid Howells { 2208c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 2212baec2c3SDavid Howells struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 2228c3e34a4SDavid Howells struct rb_node *parent, **pp; 223e34d4234SDavid Howells const void *here = __builtin_return_address(0); 224999b69f8SDavid Howells int ret; 2258c3e34a4SDavid Howells 22648124178SDavid Howells _enter("%p,%lx", rx, p->user_call_ID); 2278c3e34a4SDavid Howells 2289faaff59SDavid Howells call = rxrpc_alloc_client_call(rx, srx, gfp); 2298c3e34a4SDavid Howells if (IS_ERR(call)) { 230540b1c48SDavid Howells release_sock(&rx->sk); 2318c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2328c3e34a4SDavid Howells return call; 2338c3e34a4SDavid Howells } 2348c3e34a4SDavid Howells 23548124178SDavid Howells call->tx_total_len = p->tx_total_len; 236a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 23748124178SDavid Howells here, (const void *)p->user_call_ID); 238e34d4234SDavid Howells 239540b1c48SDavid Howells /* We need to protect a partially set up call against the user as we 240540b1c48SDavid Howells * will be acting outside the socket lock. 241540b1c48SDavid Howells */ 242540b1c48SDavid Howells mutex_lock(&call->user_mutex); 243540b1c48SDavid Howells 244999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2458c3e34a4SDavid Howells write_lock(&rx->call_lock); 2468c3e34a4SDavid Howells 2478c3e34a4SDavid Howells pp = &rx->calls.rb_node; 2488c3e34a4SDavid Howells parent = NULL; 2498c3e34a4SDavid Howells while (*pp) { 2508c3e34a4SDavid Howells parent = *pp; 2518c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 2528c3e34a4SDavid Howells 25348124178SDavid Howells if (p->user_call_ID < xcall->user_call_ID) 2548c3e34a4SDavid Howells pp = &(*pp)->rb_left; 25548124178SDavid Howells else if (p->user_call_ID > xcall->user_call_ID) 2568c3e34a4SDavid Howells pp = &(*pp)->rb_right; 2578c3e34a4SDavid Howells else 258357f5ef6SDavid Howells goto error_dup_user_ID; 2598c3e34a4SDavid Howells } 2608c3e34a4SDavid Howells 261248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 26248124178SDavid Howells call->user_call_ID = p->user_call_ID; 263357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 264fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2658c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2668c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 267248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 268248f219cSDavid Howells 2698c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2708c3e34a4SDavid Howells 2712baec2c3SDavid Howells write_lock(&rxnet->call_lock); 2722baec2c3SDavid Howells list_add_tail(&call->link, &rxnet->calls); 2732baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 2748c3e34a4SDavid Howells 275540b1c48SDavid Howells /* From this point on, the call is protected by its own lock. */ 276540b1c48SDavid Howells release_sock(&rx->sk); 277540b1c48SDavid Howells 278248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 279248f219cSDavid Howells * including channel number and call ID. 280248f219cSDavid Howells */ 281248f219cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 282999b69f8SDavid Howells if (ret < 0) 283999b69f8SDavid Howells goto error; 284999b69f8SDavid Howells 285a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 28654fde423SDavid Howells here, NULL); 287a84a46d7SDavid Howells 288248f219cSDavid Howells rxrpc_start_call_timer(call); 289248f219cSDavid Howells 2908c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 2918c3e34a4SDavid Howells 2928c3e34a4SDavid Howells _leave(" = %p [new]", call); 2938c3e34a4SDavid Howells return call; 2948c3e34a4SDavid Howells 2958c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 2968c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 2978c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 2988c3e34a4SDavid Howells * same time in different threads. 2998c3e34a4SDavid Howells */ 300357f5ef6SDavid Howells error_dup_user_ID: 3018c3e34a4SDavid Howells write_unlock(&rx->call_lock); 302540b1c48SDavid Howells release_sock(&rx->sk); 3038d94aa38SDavid Howells ret = -EEXIST; 304357f5ef6SDavid Howells 305357f5ef6SDavid Howells error: 306357f5ef6SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 307357f5ef6SDavid Howells RX_CALL_DEAD, ret); 308a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 309a84a46d7SDavid Howells here, ERR_PTR(ret)); 310357f5ef6SDavid Howells rxrpc_release_call(rx, call); 311540b1c48SDavid Howells mutex_unlock(&call->user_mutex); 312357f5ef6SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 313357f5ef6SDavid Howells _leave(" = %d", ret); 314357f5ef6SDavid Howells return ERR_PTR(ret); 3158c3e34a4SDavid Howells } 3168c3e34a4SDavid Howells 3178c3e34a4SDavid Howells /* 318c038a58cSDavid Howells * Retry a call to a new address. It is expected that the Tx queue of the call 319c038a58cSDavid Howells * will contain data previously packaged for an old call. 320c038a58cSDavid Howells */ 321c038a58cSDavid Howells int rxrpc_retry_client_call(struct rxrpc_sock *rx, 322c038a58cSDavid Howells struct rxrpc_call *call, 323c038a58cSDavid Howells struct rxrpc_conn_parameters *cp, 324c038a58cSDavid Howells struct sockaddr_rxrpc *srx, 325c038a58cSDavid Howells gfp_t gfp) 326c038a58cSDavid Howells { 327c038a58cSDavid Howells const void *here = __builtin_return_address(0); 328c038a58cSDavid Howells int ret; 329c038a58cSDavid Howells 330c038a58cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 331c038a58cSDavid Howells * including channel number and call ID. 332c038a58cSDavid Howells */ 333c038a58cSDavid Howells ret = rxrpc_connect_call(call, cp, srx, gfp); 334c038a58cSDavid Howells if (ret < 0) 335c038a58cSDavid Howells goto error; 336c038a58cSDavid Howells 337c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 338c038a58cSDavid Howells here, NULL); 339c038a58cSDavid Howells 340c038a58cSDavid Howells rxrpc_start_call_timer(call); 341c038a58cSDavid Howells 342c038a58cSDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 343c038a58cSDavid Howells 344c038a58cSDavid Howells if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 345c038a58cSDavid Howells rxrpc_queue_call(call); 346c038a58cSDavid Howells 347c038a58cSDavid Howells _leave(" = 0"); 348c038a58cSDavid Howells return 0; 349c038a58cSDavid Howells 350c038a58cSDavid Howells error: 351c038a58cSDavid Howells rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 352c038a58cSDavid Howells RX_CALL_DEAD, ret); 353c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 354c038a58cSDavid Howells here, ERR_PTR(ret)); 355c038a58cSDavid Howells _leave(" = %d", ret); 356c038a58cSDavid Howells return ret; 357c038a58cSDavid Howells } 358c038a58cSDavid Howells 359c038a58cSDavid Howells /* 360248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 361248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3628c3e34a4SDavid Howells */ 363248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 364248f219cSDavid Howells struct rxrpc_call *call, 36542886ffeSDavid Howells struct sk_buff *skb) 3668c3e34a4SDavid Howells { 367248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 36842886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 369248f219cSDavid Howells u32 chan; 3708c3e34a4SDavid Howells 371248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3728c3e34a4SDavid Howells 373248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 374248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 375248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 376248f219cSDavid Howells call->cid = sp->hdr.cid; 377248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 378248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 379248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 38057494343SDavid Howells call->cong_tstamp = skb->tstamp; 3818c3e34a4SDavid Howells 382248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 383248f219cSDavid Howells * only defending against the data_ready handler (which we're called 384248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 385248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 386248f219cSDavid Howells * call pointer). 3878c3e34a4SDavid Howells */ 388248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 389248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 390248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 391a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3928c3e34a4SDavid Howells 39385f32278SDavid Howells spin_lock(&conn->params.peer->lock); 39485f32278SDavid Howells hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 39585f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 3968c3e34a4SDavid Howells 3978c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 3988c3e34a4SDavid Howells 399248f219cSDavid Howells rxrpc_start_call_timer(call); 400248f219cSDavid Howells _leave(""); 4018c3e34a4SDavid Howells } 4028c3e34a4SDavid Howells 4038c3e34a4SDavid Howells /* 4048d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass 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_add_unless(&call->usage, 1, 0); 4108d94aa38SDavid Howells if (n == 0) 4118d94aa38SDavid Howells return false; 4128d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 4132ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 4148d94aa38SDavid Howells else 4158d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4168d94aa38SDavid Howells return true; 4178d94aa38SDavid Howells } 4188d94aa38SDavid Howells 4198d94aa38SDavid Howells /* 4208d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 4218d94aa38SDavid Howells */ 4228d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 4238d94aa38SDavid Howells { 4248d94aa38SDavid Howells const void *here = __builtin_return_address(0); 4258d94aa38SDavid Howells int n = atomic_read(&call->usage); 4268d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 4278d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 4282ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 4298d94aa38SDavid Howells else 4308d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4318d94aa38SDavid Howells return true; 4328d94aa38SDavid Howells } 4338d94aa38SDavid Howells 4348d94aa38SDavid Howells /* 435e34d4234SDavid Howells * Note the re-emergence of a call. 436e34d4234SDavid Howells */ 437e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 438e34d4234SDavid Howells { 439e34d4234SDavid Howells const void *here = __builtin_return_address(0); 440e34d4234SDavid Howells if (call) { 441e34d4234SDavid Howells int n = atomic_read(&call->usage); 442e34d4234SDavid Howells 4432ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 444e34d4234SDavid Howells } 445e34d4234SDavid Howells } 446e34d4234SDavid Howells 447e34d4234SDavid Howells /* 448e34d4234SDavid Howells * Note the addition of a ref on a call. 449e34d4234SDavid Howells */ 450fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 451e34d4234SDavid Howells { 452e34d4234SDavid Howells const void *here = __builtin_return_address(0); 453e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 454e34d4234SDavid Howells 4552ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 456e34d4234SDavid Howells } 457e34d4234SDavid Howells 458e34d4234SDavid Howells /* 459248f219cSDavid Howells * Detach a call from its owning socket. 4608c3e34a4SDavid Howells */ 4618d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4628c3e34a4SDavid Howells { 463a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 464248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 465248f219cSDavid Howells bool put = false; 466248f219cSDavid Howells int i; 467248f219cSDavid Howells 468248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 469248f219cSDavid Howells 470a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 471a84a46d7SDavid Howells here, (const void *)call->flags); 4728c3e34a4SDavid Howells 473a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 474e34d4234SDavid Howells 4758c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4768c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4778c3e34a4SDavid Howells BUG(); 4788c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4798c3e34a4SDavid Howells 480248f219cSDavid Howells del_timer_sync(&call->timer); 4818c3e34a4SDavid Howells 482248f219cSDavid Howells /* Make sure we don't get any more notifications */ 483248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 484e653cfe4SDavid Howells 485248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4868c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4878c3e34a4SDavid Howells call, call->events, call->flags); 488248f219cSDavid Howells list_del(&call->recvmsg_link); 489248f219cSDavid Howells put = true; 490248f219cSDavid Howells } 491248f219cSDavid Howells 492248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 493248f219cSDavid Howells call->recvmsg_link.next = NULL; 494248f219cSDavid Howells call->recvmsg_link.prev = NULL; 495248f219cSDavid Howells 496248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 497248f219cSDavid Howells if (put) 498248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 499248f219cSDavid Howells 500248f219cSDavid Howells write_lock(&rx->call_lock); 501248f219cSDavid Howells 502248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 5038c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 5048c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 5058d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 5068c3e34a4SDavid Howells } 5078c3e34a4SDavid Howells 508248f219cSDavid Howells list_del(&call->sock_link); 509248f219cSDavid Howells write_unlock(&rx->call_lock); 5108c3e34a4SDavid Howells 511248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 5128c3e34a4SDavid Howells 513248f219cSDavid Howells if (conn) 514e653cfe4SDavid Howells rxrpc_disconnect_call(call); 515e653cfe4SDavid Howells 516248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 51771f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 51871f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 51971f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 520248f219cSDavid Howells call->rxtx_buffer[i] = NULL; 5218c3e34a4SDavid Howells } 5228c3e34a4SDavid Howells 5238c3e34a4SDavid Howells _leave(""); 5248c3e34a4SDavid Howells } 5258c3e34a4SDavid Howells 5268c3e34a4SDavid Howells /* 527c038a58cSDavid Howells * Prepare a kernel service call for retry. 528c038a58cSDavid Howells */ 529c038a58cSDavid Howells int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call) 530c038a58cSDavid Howells { 531c038a58cSDavid Howells const void *here = __builtin_return_address(0); 532c038a58cSDavid Howells int i; 533c038a58cSDavid Howells u8 last = 0; 534c038a58cSDavid Howells 535c038a58cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 536c038a58cSDavid Howells 537c038a58cSDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 538c038a58cSDavid Howells here, (const void *)call->flags); 539c038a58cSDavid Howells 540c038a58cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 541c038a58cSDavid Howells ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED); 542c038a58cSDavid Howells ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED); 543c038a58cSDavid Howells ASSERT(list_empty(&call->recvmsg_link)); 544c038a58cSDavid Howells 545c038a58cSDavid Howells del_timer_sync(&call->timer); 546c038a58cSDavid Howells 547c038a58cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn); 548c038a58cSDavid Howells 549c038a58cSDavid Howells if (call->conn) 550c038a58cSDavid Howells rxrpc_disconnect_call(call); 551c038a58cSDavid Howells 552c038a58cSDavid Howells if (rxrpc_is_service_call(call) || 553c038a58cSDavid Howells !call->tx_phase || 554c038a58cSDavid Howells call->tx_hard_ack != 0 || 555c038a58cSDavid Howells call->rx_hard_ack != 0 || 556c038a58cSDavid Howells call->rx_top != 0) 557c038a58cSDavid Howells return -EINVAL; 558c038a58cSDavid Howells 559c038a58cSDavid Howells call->state = RXRPC_CALL_UNINITIALISED; 560c038a58cSDavid Howells call->completion = RXRPC_CALL_SUCCEEDED; 561c038a58cSDavid Howells call->call_id = 0; 562c038a58cSDavid Howells call->cid = 0; 563c038a58cSDavid Howells call->cong_cwnd = 0; 564c038a58cSDavid Howells call->cong_extra = 0; 565c038a58cSDavid Howells call->cong_ssthresh = 0; 566c038a58cSDavid Howells call->cong_mode = 0; 567c038a58cSDavid Howells call->cong_dup_acks = 0; 568c038a58cSDavid Howells call->cong_cumul_acks = 0; 569c038a58cSDavid Howells call->acks_lowest_nak = 0; 570c038a58cSDavid Howells 571c038a58cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 572c038a58cSDavid Howells last |= call->rxtx_annotations[i]; 573c038a58cSDavid Howells call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST; 574c038a58cSDavid Howells call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS; 575c038a58cSDavid Howells } 576c038a58cSDavid Howells 577c038a58cSDavid Howells _leave(" = 0"); 578c038a58cSDavid Howells return 0; 579c038a58cSDavid Howells } 580c038a58cSDavid Howells 581c038a58cSDavid Howells /* 5828c3e34a4SDavid Howells * release all the calls associated with a socket 5838c3e34a4SDavid Howells */ 5848c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 5858c3e34a4SDavid Howells { 5868c3e34a4SDavid Howells struct rxrpc_call *call; 5878c3e34a4SDavid Howells 5888c3e34a4SDavid Howells _enter("%p", rx); 5898c3e34a4SDavid Howells 5900360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 5910360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 5920360da6dSDavid Howells struct rxrpc_call, accept_link); 5930360da6dSDavid Howells list_del(&call->accept_link); 5943a92789aSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 5950360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5960360da6dSDavid Howells } 5970360da6dSDavid Howells 598248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 599248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 600248f219cSDavid Howells struct rxrpc_call, sock_link); 601248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 6023a92789aSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 60326cb02aaSDavid Howells rxrpc_send_abort_packet(call); 6048d94aa38SDavid Howells rxrpc_release_call(rx, call); 605248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 6068c3e34a4SDavid Howells } 6078c3e34a4SDavid Howells 6088c3e34a4SDavid Howells _leave(""); 6098c3e34a4SDavid Howells } 6108c3e34a4SDavid Howells 6118c3e34a4SDavid Howells /* 6128c3e34a4SDavid Howells * release a call 6138c3e34a4SDavid Howells */ 614fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 6158c3e34a4SDavid Howells { 6162baec2c3SDavid Howells struct rxrpc_net *rxnet; 617e34d4234SDavid Howells const void *here = __builtin_return_address(0); 6182ab27215SDavid Howells int n; 619e34d4234SDavid Howells 6208c3e34a4SDavid Howells ASSERT(call != NULL); 6218c3e34a4SDavid Howells 622e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 6232ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 624e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 625e34d4234SDavid Howells if (n == 0) { 6268c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 627248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 628e34d4234SDavid Howells 6292baec2c3SDavid Howells if (!list_empty(&call->link)) { 6302baec2c3SDavid Howells rxnet = rxrpc_net(sock_net(&call->socket->sk)); 6312baec2c3SDavid Howells write_lock(&rxnet->call_lock); 632248f219cSDavid Howells list_del_init(&call->link); 6332baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 6342baec2c3SDavid Howells } 635e34d4234SDavid Howells 6368d94aa38SDavid Howells rxrpc_cleanup_call(call); 637e34d4234SDavid Howells } 6388c3e34a4SDavid Howells } 6398c3e34a4SDavid Howells 6408c3e34a4SDavid Howells /* 641dee46364SDavid Howells * Final call destruction under RCU. 642dee46364SDavid Howells */ 643dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 644dee46364SDavid Howells { 645dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 646dee46364SDavid Howells 647df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 648248f219cSDavid Howells kfree(call->rxtx_buffer); 649248f219cSDavid Howells kfree(call->rxtx_annotations); 650dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 651dee46364SDavid Howells } 652dee46364SDavid Howells 653dee46364SDavid Howells /* 6548c3e34a4SDavid Howells * clean up a call 6558c3e34a4SDavid Howells */ 65600e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 6578c3e34a4SDavid Howells { 658248f219cSDavid Howells int i; 6598c3e34a4SDavid Howells 660248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 6618c3e34a4SDavid Howells 6628c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 6638c3e34a4SDavid Howells 664248f219cSDavid Howells del_timer_sync(&call->timer); 6658c3e34a4SDavid Howells 6668d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 6678c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 668e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 6698c3e34a4SDavid Howells 670248f219cSDavid Howells /* Clean up the Rx/Tx buffer */ 671248f219cSDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 67271f3ca40SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 67371f3ca40SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 67471f3ca40SDavid Howells rxrpc_skb_rx_cleaned)); 6758c3e34a4SDavid Howells 67671f3ca40SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 6778c3e34a4SDavid Howells 678dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 6798c3e34a4SDavid Howells } 6808c3e34a4SDavid Howells 6818c3e34a4SDavid Howells /* 6822baec2c3SDavid Howells * Make sure that all calls are gone from a network namespace. To reach this 6832baec2c3SDavid Howells * point, any open UDP sockets in that namespace must have been closed, so any 6842baec2c3SDavid Howells * outstanding calls cannot be doing I/O. 6858c3e34a4SDavid Howells */ 6862baec2c3SDavid Howells void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 6878c3e34a4SDavid Howells { 6888c3e34a4SDavid Howells struct rxrpc_call *call; 6898c3e34a4SDavid Howells 6908c3e34a4SDavid Howells _enter(""); 6918d94aa38SDavid Howells 6922baec2c3SDavid Howells if (list_empty(&rxnet->calls)) 6938d94aa38SDavid Howells return; 6948d94aa38SDavid Howells 6952baec2c3SDavid Howells write_lock(&rxnet->call_lock); 6968c3e34a4SDavid Howells 6972baec2c3SDavid Howells while (!list_empty(&rxnet->calls)) { 6982baec2c3SDavid Howells call = list_entry(rxnet->calls.next, struct rxrpc_call, link); 6998c3e34a4SDavid Howells _debug("Zapping call %p", call); 7008c3e34a4SDavid Howells 701e34d4234SDavid Howells rxrpc_see_call(call); 7028c3e34a4SDavid Howells list_del_init(&call->link); 7038c3e34a4SDavid Howells 704248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 7058c3e34a4SDavid Howells call, atomic_read(&call->usage), 7068c3e34a4SDavid Howells rxrpc_call_states[call->state], 7078c3e34a4SDavid Howells call->flags, call->events); 7088c3e34a4SDavid Howells 7092baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 7108c3e34a4SDavid Howells cond_resched(); 7112baec2c3SDavid Howells write_lock(&rxnet->call_lock); 7128c3e34a4SDavid Howells } 7138c3e34a4SDavid Howells 7142baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 7158c3e34a4SDavid Howells } 716