12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 28c3e34a4SDavid Howells /* RxRPC individual remote procedure call handling 38c3e34a4SDavid Howells * 48c3e34a4SDavid Howells * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 58c3e34a4SDavid Howells * Written by David Howells (dhowells@redhat.com) 68c3e34a4SDavid Howells */ 78c3e34a4SDavid Howells 88c3e34a4SDavid Howells #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 98c3e34a4SDavid Howells 108c3e34a4SDavid Howells #include <linux/slab.h> 118c3e34a4SDavid Howells #include <linux/module.h> 128c3e34a4SDavid Howells #include <linux/circ_buf.h> 138c3e34a4SDavid Howells #include <linux/spinlock_types.h> 148c3e34a4SDavid Howells #include <net/sock.h> 158c3e34a4SDavid Howells #include <net/af_rxrpc.h> 168c3e34a4SDavid Howells #include "ar-internal.h" 178c3e34a4SDavid Howells 188c3e34a4SDavid Howells const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { 19999b69f8SDavid Howells [RXRPC_CALL_UNINITIALISED] = "Uninit ", 20999b69f8SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", 218c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", 228c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", 238c3e34a4SDavid Howells [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", 2400e90712SDavid Howells [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", 258c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SECURING] = "SvSecure", 268c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", 278c3e34a4SDavid Howells [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", 288c3e34a4SDavid Howells [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 298c3e34a4SDavid Howells [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 308c3e34a4SDavid Howells [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 318c3e34a4SDavid Howells [RXRPC_CALL_COMPLETE] = "Complete", 32f5c17aaeSDavid Howells }; 33f5c17aaeSDavid Howells 34f5c17aaeSDavid Howells const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 35f5c17aaeSDavid Howells [RXRPC_CALL_SUCCEEDED] = "Complete", 368c3e34a4SDavid Howells [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 378c3e34a4SDavid Howells [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 38f5c17aaeSDavid Howells [RXRPC_CALL_LOCAL_ERROR] = "LocError", 398c3e34a4SDavid Howells [RXRPC_CALL_NETWORK_ERROR] = "NetError", 408c3e34a4SDavid Howells }; 418c3e34a4SDavid Howells 428c3e34a4SDavid Howells struct kmem_cache *rxrpc_call_jar; 438c3e34a4SDavid Howells 44e99e88a9SKees Cook static void rxrpc_call_timer_expired(struct timer_list *t) 45248f219cSDavid Howells { 46e99e88a9SKees Cook struct rxrpc_call *call = from_timer(call, t, timer); 47248f219cSDavid Howells 48248f219cSDavid Howells _enter("%d", call->debug_id); 49248f219cSDavid Howells 50a158bdd3SDavid Howells if (call->state < RXRPC_CALL_COMPLETE) { 51a158bdd3SDavid Howells trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); 52a158bdd3SDavid Howells rxrpc_queue_call(call); 53fc7ab6d2SDavid Howells } 54248f219cSDavid Howells } 558c3e34a4SDavid Howells 569faaff59SDavid Howells static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 578c3e34a4SDavid Howells 588c3e34a4SDavid Howells /* 598c3e34a4SDavid Howells * find an extant server call 608c3e34a4SDavid Howells * - called in process context with IRQs enabled 618c3e34a4SDavid Howells */ 628c3e34a4SDavid Howells struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 638c3e34a4SDavid Howells unsigned long user_call_ID) 648c3e34a4SDavid Howells { 658c3e34a4SDavid Howells struct rxrpc_call *call; 668c3e34a4SDavid Howells struct rb_node *p; 678c3e34a4SDavid Howells 688c3e34a4SDavid Howells _enter("%p,%lx", rx, user_call_ID); 698c3e34a4SDavid Howells 708c3e34a4SDavid Howells read_lock(&rx->call_lock); 718c3e34a4SDavid Howells 728c3e34a4SDavid Howells p = rx->calls.rb_node; 738c3e34a4SDavid Howells while (p) { 748c3e34a4SDavid Howells call = rb_entry(p, struct rxrpc_call, sock_node); 758c3e34a4SDavid Howells 768c3e34a4SDavid Howells if (user_call_ID < call->user_call_ID) 778c3e34a4SDavid Howells p = p->rb_left; 788c3e34a4SDavid Howells else if (user_call_ID > call->user_call_ID) 798c3e34a4SDavid Howells p = p->rb_right; 808c3e34a4SDavid Howells else 818c3e34a4SDavid Howells goto found_extant_call; 828c3e34a4SDavid Howells } 838c3e34a4SDavid Howells 848c3e34a4SDavid Howells read_unlock(&rx->call_lock); 858c3e34a4SDavid Howells _leave(" = NULL"); 868c3e34a4SDavid Howells return NULL; 878c3e34a4SDavid Howells 888c3e34a4SDavid Howells found_extant_call: 89fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got); 908c3e34a4SDavid Howells read_unlock(&rx->call_lock); 918c3e34a4SDavid Howells _leave(" = %p [%d]", call, atomic_read(&call->usage)); 928c3e34a4SDavid Howells return call; 938c3e34a4SDavid Howells } 948c3e34a4SDavid Howells 958c3e34a4SDavid Howells /* 968c3e34a4SDavid Howells * allocate a new call 978c3e34a4SDavid Howells */ 98a25e21f0SDavid Howells struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 99a25e21f0SDavid Howells unsigned int debug_id) 1008c3e34a4SDavid Howells { 1018c3e34a4SDavid Howells struct rxrpc_call *call; 102d3be4d24SDavid Howells struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 1038c3e34a4SDavid Howells 1048c3e34a4SDavid Howells call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 1058c3e34a4SDavid Howells if (!call) 1068c3e34a4SDavid Howells return NULL; 1078c3e34a4SDavid Howells 108248f219cSDavid Howells call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 109248f219cSDavid Howells sizeof(struct sk_buff *), 1108c3e34a4SDavid Howells gfp); 111248f219cSDavid Howells if (!call->rxtx_buffer) 112248f219cSDavid Howells goto nomem; 1138c3e34a4SDavid Howells 114248f219cSDavid Howells call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 115248f219cSDavid Howells if (!call->rxtx_annotations) 116248f219cSDavid Howells goto nomem_2; 117248f219cSDavid Howells 118540b1c48SDavid Howells mutex_init(&call->user_mutex); 1199faaff59SDavid Howells 1209faaff59SDavid Howells /* Prevent lockdep reporting a deadlock false positive between the afs 1219faaff59SDavid Howells * filesystem and sys_sendmsg() via the mmap sem. 1229faaff59SDavid Howells */ 1239faaff59SDavid Howells if (rx->sk.sk_kern_sock) 1249faaff59SDavid Howells lockdep_set_class(&call->user_mutex, 1259faaff59SDavid Howells &rxrpc_call_user_mutex_lock_class_key); 1269faaff59SDavid Howells 127e99e88a9SKees Cook timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 1288c3e34a4SDavid Howells INIT_WORK(&call->processor, &rxrpc_process_call); 129999b69f8SDavid Howells INIT_LIST_HEAD(&call->link); 13045025bceSDavid Howells INIT_LIST_HEAD(&call->chan_wait_link); 1318c3e34a4SDavid Howells INIT_LIST_HEAD(&call->accept_link); 132248f219cSDavid Howells INIT_LIST_HEAD(&call->recvmsg_link); 133248f219cSDavid Howells INIT_LIST_HEAD(&call->sock_link); 13445025bceSDavid Howells init_waitqueue_head(&call->waitq); 1358c3e34a4SDavid Howells spin_lock_init(&call->lock); 13620acbd9aSDavid Howells spin_lock_init(&call->notify_lock); 137c1e15b49SDavid Howells spin_lock_init(&call->input_lock); 1388c3e34a4SDavid Howells rwlock_init(&call->state_lock); 1398c3e34a4SDavid Howells atomic_set(&call->usage, 1); 140a25e21f0SDavid Howells call->debug_id = debug_id; 141e754eba6SDavid Howells call->tx_total_len = -1; 142a158bdd3SDavid Howells call->next_rx_timo = 20 * HZ; 143a158bdd3SDavid Howells call->next_req_timo = 1 * HZ; 1448c3e34a4SDavid Howells 1458c3e34a4SDavid Howells memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 1468c3e34a4SDavid Howells 147248f219cSDavid Howells /* Leave space in the ring to handle a maxed-out jumbo packet */ 14875e42126SDavid Howells call->rx_winsize = rxrpc_rx_window_size; 149248f219cSDavid Howells call->tx_winsize = 16; 150248f219cSDavid Howells call->rx_expect_next = 1; 15157494343SDavid Howells 15257494343SDavid Howells call->cong_cwnd = 2; 15357494343SDavid Howells call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 154d3be4d24SDavid Howells 155d3be4d24SDavid Howells call->rxnet = rxnet; 156d3be4d24SDavid Howells atomic_inc(&rxnet->nr_calls); 1578c3e34a4SDavid Howells return call; 158248f219cSDavid Howells 159248f219cSDavid Howells nomem_2: 160248f219cSDavid Howells kfree(call->rxtx_buffer); 161248f219cSDavid Howells nomem: 162248f219cSDavid Howells kmem_cache_free(rxrpc_call_jar, call); 163248f219cSDavid Howells return NULL; 1648c3e34a4SDavid Howells } 1658c3e34a4SDavid Howells 1668c3e34a4SDavid Howells /* 167999b69f8SDavid Howells * Allocate a new client call. 1688c3e34a4SDavid Howells */ 1699faaff59SDavid Howells static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 1709faaff59SDavid Howells struct sockaddr_rxrpc *srx, 171a25e21f0SDavid Howells gfp_t gfp, 172a25e21f0SDavid Howells unsigned int debug_id) 1738c3e34a4SDavid Howells { 1748c3e34a4SDavid Howells struct rxrpc_call *call; 17557494343SDavid Howells ktime_t now; 1768c3e34a4SDavid Howells 1778c3e34a4SDavid Howells _enter(""); 1788c3e34a4SDavid Howells 179a25e21f0SDavid Howells call = rxrpc_alloc_call(rx, gfp, debug_id); 1808c3e34a4SDavid Howells if (!call) 1818c3e34a4SDavid Howells return ERR_PTR(-ENOMEM); 182999b69f8SDavid Howells call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 183999b69f8SDavid Howells call->service_id = srx->srx_service; 18471f3ca40SDavid Howells call->tx_phase = true; 18557494343SDavid Howells now = ktime_get_real(); 18657494343SDavid Howells call->acks_latest_ts = now; 18757494343SDavid Howells call->cong_tstamp = now; 188999b69f8SDavid Howells 189999b69f8SDavid Howells _leave(" = %p", call); 190999b69f8SDavid Howells return call; 191999b69f8SDavid Howells } 192999b69f8SDavid Howells 193999b69f8SDavid Howells /* 194248f219cSDavid Howells * Initiate the call ack/resend/expiry timer. 195999b69f8SDavid Howells */ 196248f219cSDavid Howells static void rxrpc_start_call_timer(struct rxrpc_call *call) 197999b69f8SDavid Howells { 198a158bdd3SDavid Howells unsigned long now = jiffies; 199a158bdd3SDavid Howells unsigned long j = now + MAX_JIFFY_OFFSET; 200999b69f8SDavid Howells 201a158bdd3SDavid Howells call->ack_at = j; 202bd1fdf8cSDavid Howells call->ack_lost_at = j; 203a158bdd3SDavid Howells call->resend_at = j; 204a158bdd3SDavid Howells call->ping_at = j; 205a158bdd3SDavid Howells call->expect_rx_by = j; 206a158bdd3SDavid Howells call->expect_req_by = j; 207a158bdd3SDavid Howells call->expect_term_by = j; 208a158bdd3SDavid Howells call->timer.expires = now; 2098c3e34a4SDavid Howells } 2108c3e34a4SDavid Howells 2118c3e34a4SDavid Howells /* 212540b1c48SDavid Howells * Set up a call for the given parameters. 213540b1c48SDavid Howells * - Called with the socket lock held, which it must release. 214540b1c48SDavid Howells * - If it returns a call, the call's lock will need releasing by the caller. 2158c3e34a4SDavid Howells */ 2168c3e34a4SDavid Howells struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 21719ffa01cSDavid Howells struct rxrpc_conn_parameters *cp, 218999b69f8SDavid Howells struct sockaddr_rxrpc *srx, 21948124178SDavid Howells struct rxrpc_call_params *p, 220a25e21f0SDavid Howells gfp_t gfp, 221a25e21f0SDavid Howells unsigned int debug_id) 222540b1c48SDavid Howells __releases(&rx->sk.sk_lock.slock) 22388f2a825SDavid Howells __acquires(&call->user_mutex) 2248c3e34a4SDavid Howells { 2258c3e34a4SDavid Howells struct rxrpc_call *call, *xcall; 226d3be4d24SDavid Howells struct rxrpc_net *rxnet; 2278c3e34a4SDavid Howells struct rb_node *parent, **pp; 228e34d4234SDavid Howells const void *here = __builtin_return_address(0); 229999b69f8SDavid Howells int ret; 2308c3e34a4SDavid Howells 23148124178SDavid Howells _enter("%p,%lx", rx, p->user_call_ID); 2328c3e34a4SDavid Howells 233a25e21f0SDavid Howells call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); 2348c3e34a4SDavid Howells if (IS_ERR(call)) { 235540b1c48SDavid Howells release_sock(&rx->sk); 2368c3e34a4SDavid Howells _leave(" = %ld", PTR_ERR(call)); 2378c3e34a4SDavid Howells return call; 2388c3e34a4SDavid Howells } 2398c3e34a4SDavid Howells 240b960a34bSDavid Howells if (p->intr) 241b960a34bSDavid Howells __set_bit(RXRPC_CALL_IS_INTR, &call->flags); 24248124178SDavid Howells call->tx_total_len = p->tx_total_len; 24348c9e0ecSDavid Howells trace_rxrpc_call(call->debug_id, rxrpc_call_new_client, 24448c9e0ecSDavid Howells 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 */ 2905e33a23bSDavid Howells ret = rxrpc_connect_call(rx, call, cp, srx, gfp); 291999b69f8SDavid Howells if (ret < 0) 292999b69f8SDavid Howells goto error; 293999b69f8SDavid Howells 29448c9e0ecSDavid Howells trace_rxrpc_call(call->debug_id, rxrpc_call_connected, 29548c9e0ecSDavid Howells atomic_read(&call->usage), 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); 31748c9e0ecSDavid Howells trace_rxrpc_call(call->debug_id, rxrpc_call_error, 31848c9e0ecSDavid Howells atomic_read(&call->usage), 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 /* 327248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 328248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3298c3e34a4SDavid Howells */ 330248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 331248f219cSDavid Howells struct rxrpc_call *call, 33242886ffeSDavid Howells struct sk_buff *skb) 3338c3e34a4SDavid Howells { 334248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 33542886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 336248f219cSDavid Howells u32 chan; 3378c3e34a4SDavid Howells 338248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3398c3e34a4SDavid Howells 340248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 341248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 342248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 343248f219cSDavid Howells call->cid = sp->hdr.cid; 344248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 345248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 346248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 34757494343SDavid Howells call->cong_tstamp = skb->tstamp; 3488c3e34a4SDavid Howells 349248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 350248f219cSDavid Howells * only defending against the data_ready handler (which we're called 351248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 352248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 353248f219cSDavid Howells * call pointer). 3548c3e34a4SDavid Howells */ 355248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 356248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 357248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 358a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3598c3e34a4SDavid Howells 36085f32278SDavid Howells spin_lock(&conn->params.peer->lock); 361f3344303SDavid Howells hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); 36285f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 3638c3e34a4SDavid Howells 3648c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 3658c3e34a4SDavid Howells 366248f219cSDavid Howells rxrpc_start_call_timer(call); 367248f219cSDavid Howells _leave(""); 3688c3e34a4SDavid Howells } 3698c3e34a4SDavid Howells 3708c3e34a4SDavid Howells /* 3718d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 3728d94aa38SDavid Howells */ 3738d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 3748d94aa38SDavid Howells { 3758d94aa38SDavid Howells const void *here = __builtin_return_address(0); 376bfc18e38SMark Rutland int n = atomic_fetch_add_unless(&call->usage, 1, 0); 3778d94aa38SDavid Howells if (n == 0) 3788d94aa38SDavid Howells return false; 3798d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 38048c9e0ecSDavid Howells trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1, 38148c9e0ecSDavid Howells here, NULL); 3828d94aa38SDavid Howells else 3838d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3848d94aa38SDavid Howells return true; 3858d94aa38SDavid Howells } 3868d94aa38SDavid Howells 3878d94aa38SDavid Howells /* 3888d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 3898d94aa38SDavid Howells */ 3908d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 3918d94aa38SDavid Howells { 3928d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3938d94aa38SDavid Howells int n = atomic_read(&call->usage); 3948d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 3958d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 39648c9e0ecSDavid Howells trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n, 39748c9e0ecSDavid Howells here, NULL); 3988d94aa38SDavid Howells else 3998d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 4008d94aa38SDavid Howells return true; 4018d94aa38SDavid Howells } 4028d94aa38SDavid Howells 4038d94aa38SDavid Howells /* 404e34d4234SDavid Howells * Note the re-emergence of a call. 405e34d4234SDavid Howells */ 406e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 407e34d4234SDavid Howells { 408e34d4234SDavid Howells const void *here = __builtin_return_address(0); 409e34d4234SDavid Howells if (call) { 410e34d4234SDavid Howells int n = atomic_read(&call->usage); 411e34d4234SDavid Howells 41248c9e0ecSDavid Howells trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n, 41348c9e0ecSDavid Howells here, NULL); 414e34d4234SDavid Howells } 415e34d4234SDavid Howells } 416e34d4234SDavid Howells 417e34d4234SDavid Howells /* 418e34d4234SDavid Howells * Note the addition of a ref on a call. 419e34d4234SDavid Howells */ 420fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 421e34d4234SDavid Howells { 422e34d4234SDavid Howells const void *here = __builtin_return_address(0); 423e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 424e34d4234SDavid Howells 42548c9e0ecSDavid Howells trace_rxrpc_call(call->debug_id, op, n, here, NULL); 426e34d4234SDavid Howells } 427e34d4234SDavid Howells 428e34d4234SDavid Howells /* 429a641fd00SDavid Howells * Clean up the RxTx skb ring. 430a641fd00SDavid Howells */ 431a641fd00SDavid Howells static void rxrpc_cleanup_ring(struct rxrpc_call *call) 432a641fd00SDavid Howells { 433a641fd00SDavid Howells int i; 434a641fd00SDavid Howells 435a641fd00SDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 436987db9f7SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned); 437a641fd00SDavid Howells call->rxtx_buffer[i] = NULL; 438a641fd00SDavid Howells } 439a641fd00SDavid Howells } 440a641fd00SDavid Howells 441a641fd00SDavid Howells /* 442248f219cSDavid Howells * Detach a call from its owning socket. 4438c3e34a4SDavid Howells */ 4448d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4458c3e34a4SDavid Howells { 446a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 447248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 448248f219cSDavid Howells bool put = false; 449248f219cSDavid Howells 450248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 451248f219cSDavid Howells 45248c9e0ecSDavid Howells trace_rxrpc_call(call->debug_id, rxrpc_call_release, 45348c9e0ecSDavid Howells atomic_read(&call->usage), 454a84a46d7SDavid Howells here, (const void *)call->flags); 4558c3e34a4SDavid Howells 456a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 457e34d4234SDavid Howells 4588c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4598c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4608c3e34a4SDavid Howells BUG(); 4618c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4628c3e34a4SDavid Howells 463248f219cSDavid Howells del_timer_sync(&call->timer); 4648c3e34a4SDavid Howells 465248f219cSDavid Howells /* Make sure we don't get any more notifications */ 466248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 467e653cfe4SDavid Howells 468248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4698c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4708c3e34a4SDavid Howells call, call->events, call->flags); 471248f219cSDavid Howells list_del(&call->recvmsg_link); 472248f219cSDavid Howells put = true; 473248f219cSDavid Howells } 474248f219cSDavid Howells 475248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 476248f219cSDavid Howells call->recvmsg_link.next = NULL; 477248f219cSDavid Howells call->recvmsg_link.prev = NULL; 478248f219cSDavid Howells 479248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 480248f219cSDavid Howells if (put) 481248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 482248f219cSDavid Howells 483248f219cSDavid Howells write_lock(&rx->call_lock); 484248f219cSDavid Howells 485248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 4868c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 4878c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 4888d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 4898c3e34a4SDavid Howells } 4908c3e34a4SDavid Howells 491248f219cSDavid Howells list_del(&call->sock_link); 492248f219cSDavid Howells write_unlock(&rx->call_lock); 4938c3e34a4SDavid Howells 494248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 4958c3e34a4SDavid Howells 4961db88c53SDavid Howells if (conn) { 497e653cfe4SDavid Howells rxrpc_disconnect_call(call); 4981db88c53SDavid Howells conn->security->free_call_crypto(call); 4991db88c53SDavid Howells } 500e653cfe4SDavid Howells 501a641fd00SDavid Howells rxrpc_cleanup_ring(call); 5028c3e34a4SDavid Howells _leave(""); 5038c3e34a4SDavid Howells } 5048c3e34a4SDavid Howells 5058c3e34a4SDavid Howells /* 5068c3e34a4SDavid Howells * release all the calls associated with a socket 5078c3e34a4SDavid Howells */ 5088c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 5098c3e34a4SDavid Howells { 5108c3e34a4SDavid Howells struct rxrpc_call *call; 5118c3e34a4SDavid Howells 5128c3e34a4SDavid Howells _enter("%p", rx); 5138c3e34a4SDavid Howells 5140360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 5150360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 5160360da6dSDavid Howells struct rxrpc_call, accept_link); 5170360da6dSDavid Howells list_del(&call->accept_link); 5183a92789aSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 5190360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5200360da6dSDavid Howells } 5210360da6dSDavid Howells 522248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 523248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 524248f219cSDavid Howells struct rxrpc_call, sock_link); 525248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 5263a92789aSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 52726cb02aaSDavid Howells rxrpc_send_abort_packet(call); 5288d94aa38SDavid Howells rxrpc_release_call(rx, call); 529248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5308c3e34a4SDavid Howells } 5318c3e34a4SDavid Howells 5328c3e34a4SDavid Howells _leave(""); 5338c3e34a4SDavid Howells } 5348c3e34a4SDavid Howells 5358c3e34a4SDavid Howells /* 5368c3e34a4SDavid Howells * release a call 5378c3e34a4SDavid Howells */ 538fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 5398c3e34a4SDavid Howells { 540d3be4d24SDavid Howells struct rxrpc_net *rxnet = call->rxnet; 541e34d4234SDavid Howells const void *here = __builtin_return_address(0); 54248c9e0ecSDavid Howells unsigned int debug_id = call->debug_id; 5432ab27215SDavid Howells int n; 544e34d4234SDavid Howells 5458c3e34a4SDavid Howells ASSERT(call != NULL); 5468c3e34a4SDavid Howells 547e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 54848c9e0ecSDavid Howells trace_rxrpc_call(debug_id, op, n, here, NULL); 549e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 550e34d4234SDavid Howells if (n == 0) { 5518c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 552248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 553e34d4234SDavid Howells 5542baec2c3SDavid Howells if (!list_empty(&call->link)) { 5552baec2c3SDavid Howells write_lock(&rxnet->call_lock); 556248f219cSDavid Howells list_del_init(&call->link); 5572baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 5582baec2c3SDavid Howells } 559e34d4234SDavid Howells 5608d94aa38SDavid Howells rxrpc_cleanup_call(call); 561e34d4234SDavid Howells } 5628c3e34a4SDavid Howells } 5638c3e34a4SDavid Howells 5648c3e34a4SDavid Howells /* 565dee46364SDavid Howells * Final call destruction under RCU. 566dee46364SDavid Howells */ 567dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 568dee46364SDavid Howells { 569dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 570d3be4d24SDavid Howells struct rxrpc_net *rxnet = call->rxnet; 571dee46364SDavid Howells 572df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 573248f219cSDavid Howells kfree(call->rxtx_buffer); 574248f219cSDavid Howells kfree(call->rxtx_annotations); 575dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 576d3be4d24SDavid Howells if (atomic_dec_and_test(&rxnet->nr_calls)) 5775bb053beSLinus Torvalds wake_up_var(&rxnet->nr_calls); 578dee46364SDavid Howells } 579dee46364SDavid Howells 580dee46364SDavid Howells /* 5818c3e34a4SDavid Howells * clean up a call 5828c3e34a4SDavid Howells */ 58300e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 5848c3e34a4SDavid Howells { 585248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 5868c3e34a4SDavid Howells 5878c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 5888c3e34a4SDavid Howells 589248f219cSDavid Howells del_timer_sync(&call->timer); 5908c3e34a4SDavid Howells 5918d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 5928c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 593e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 5948c3e34a4SDavid Howells 595a641fd00SDavid Howells rxrpc_cleanup_ring(call); 596987db9f7SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned); 5978c3e34a4SDavid Howells 598dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 5998c3e34a4SDavid Howells } 6008c3e34a4SDavid Howells 6018c3e34a4SDavid Howells /* 6022baec2c3SDavid Howells * Make sure that all calls are gone from a network namespace. To reach this 6032baec2c3SDavid Howells * point, any open UDP sockets in that namespace must have been closed, so any 6042baec2c3SDavid Howells * outstanding calls cannot be doing I/O. 6058c3e34a4SDavid Howells */ 6062baec2c3SDavid Howells void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 6078c3e34a4SDavid Howells { 6088c3e34a4SDavid Howells struct rxrpc_call *call; 6098c3e34a4SDavid Howells 6108c3e34a4SDavid Howells _enter(""); 6118d94aa38SDavid Howells 612b1302342SDavid Howells if (!list_empty(&rxnet->calls)) { 6132baec2c3SDavid Howells write_lock(&rxnet->call_lock); 6148c3e34a4SDavid Howells 6152baec2c3SDavid Howells while (!list_empty(&rxnet->calls)) { 616b1302342SDavid Howells call = list_entry(rxnet->calls.next, 617b1302342SDavid Howells struct rxrpc_call, link); 6188c3e34a4SDavid Howells _debug("Zapping call %p", call); 6198c3e34a4SDavid Howells 620e34d4234SDavid Howells rxrpc_see_call(call); 6218c3e34a4SDavid Howells list_del_init(&call->link); 6228c3e34a4SDavid Howells 623248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 6248c3e34a4SDavid Howells call, atomic_read(&call->usage), 6258c3e34a4SDavid Howells rxrpc_call_states[call->state], 6268c3e34a4SDavid Howells call->flags, call->events); 6278c3e34a4SDavid Howells 6282baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 6298c3e34a4SDavid Howells cond_resched(); 6302baec2c3SDavid Howells write_lock(&rxnet->call_lock); 6318c3e34a4SDavid Howells } 6328c3e34a4SDavid Howells 6332baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 634b1302342SDavid Howells } 635d3be4d24SDavid Howells 636d3be4d24SDavid Howells atomic_dec(&rxnet->nr_calls); 6375bb053beSLinus Torvalds wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 6388c3e34a4SDavid Howells } 639