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; 243a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 24448124178SDavid Howells here, (const void *)p->user_call_ID); 245e34d4234SDavid Howells 246540b1c48SDavid Howells /* We need to protect a partially set up call against the user as we 247540b1c48SDavid Howells * will be acting outside the socket lock. 248540b1c48SDavid Howells */ 249540b1c48SDavid Howells mutex_lock(&call->user_mutex); 250540b1c48SDavid Howells 251999b69f8SDavid Howells /* Publish the call, even though it is incompletely set up as yet */ 2528c3e34a4SDavid Howells write_lock(&rx->call_lock); 2538c3e34a4SDavid Howells 2548c3e34a4SDavid Howells pp = &rx->calls.rb_node; 2558c3e34a4SDavid Howells parent = NULL; 2568c3e34a4SDavid Howells while (*pp) { 2578c3e34a4SDavid Howells parent = *pp; 2588c3e34a4SDavid Howells xcall = rb_entry(parent, struct rxrpc_call, sock_node); 2598c3e34a4SDavid Howells 26048124178SDavid Howells if (p->user_call_ID < xcall->user_call_ID) 2618c3e34a4SDavid Howells pp = &(*pp)->rb_left; 26248124178SDavid Howells else if (p->user_call_ID > xcall->user_call_ID) 2638c3e34a4SDavid Howells pp = &(*pp)->rb_right; 2648c3e34a4SDavid Howells else 265357f5ef6SDavid Howells goto error_dup_user_ID; 2668c3e34a4SDavid Howells } 2678c3e34a4SDavid Howells 268248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 26948124178SDavid Howells call->user_call_ID = p->user_call_ID; 270357f5ef6SDavid Howells __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 271fff72429SDavid Howells rxrpc_get_call(call, rxrpc_call_got_userid); 2728c3e34a4SDavid Howells rb_link_node(&call->sock_node, parent, pp); 2738c3e34a4SDavid Howells rb_insert_color(&call->sock_node, &rx->calls); 274248f219cSDavid Howells list_add(&call->sock_link, &rx->sock_calls); 275248f219cSDavid Howells 2768c3e34a4SDavid Howells write_unlock(&rx->call_lock); 2778c3e34a4SDavid Howells 278d3be4d24SDavid Howells rxnet = call->rxnet; 2792baec2c3SDavid Howells write_lock(&rxnet->call_lock); 2802baec2c3SDavid Howells list_add_tail(&call->link, &rxnet->calls); 2812baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 2828c3e34a4SDavid Howells 283540b1c48SDavid Howells /* From this point on, the call is protected by its own lock. */ 284540b1c48SDavid Howells release_sock(&rx->sk); 285540b1c48SDavid Howells 286248f219cSDavid Howells /* Set up or get a connection record and set the protocol parameters, 287248f219cSDavid Howells * including channel number and call ID. 288248f219cSDavid Howells */ 2895e33a23bSDavid Howells ret = rxrpc_connect_call(rx, call, cp, srx, gfp); 290999b69f8SDavid Howells if (ret < 0) 291999b69f8SDavid Howells goto error; 292999b69f8SDavid Howells 293a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 29454fde423SDavid Howells here, NULL); 295a84a46d7SDavid Howells 296248f219cSDavid Howells rxrpc_start_call_timer(call); 297248f219cSDavid Howells 2988c3e34a4SDavid Howells _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 2998c3e34a4SDavid Howells 3008c3e34a4SDavid Howells _leave(" = %p [new]", call); 3018c3e34a4SDavid Howells return call; 3028c3e34a4SDavid Howells 3038c3e34a4SDavid Howells /* We unexpectedly found the user ID in the list after taking 3048c3e34a4SDavid Howells * the call_lock. This shouldn't happen unless the user races 3058c3e34a4SDavid Howells * with itself and tries to add the same user ID twice at the 3068c3e34a4SDavid Howells * same time in different threads. 3078c3e34a4SDavid Howells */ 308357f5ef6SDavid Howells error_dup_user_ID: 3098c3e34a4SDavid Howells write_unlock(&rx->call_lock); 310540b1c48SDavid Howells release_sock(&rx->sk); 3118d94aa38SDavid Howells ret = -EEXIST; 312357f5ef6SDavid Howells 313357f5ef6SDavid Howells error: 314357f5ef6SDavid Howells __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 315357f5ef6SDavid Howells RX_CALL_DEAD, ret); 316a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 317a84a46d7SDavid Howells here, ERR_PTR(ret)); 318357f5ef6SDavid Howells rxrpc_release_call(rx, call); 319540b1c48SDavid Howells mutex_unlock(&call->user_mutex); 320357f5ef6SDavid Howells rxrpc_put_call(call, rxrpc_call_put); 321357f5ef6SDavid Howells _leave(" = %d", ret); 322357f5ef6SDavid Howells return ERR_PTR(ret); 3238c3e34a4SDavid Howells } 3248c3e34a4SDavid Howells 3258c3e34a4SDavid Howells /* 326248f219cSDavid Howells * Set up an incoming call. call->conn points to the connection. 327248f219cSDavid Howells * This is called in BH context and isn't allowed to fail. 3288c3e34a4SDavid Howells */ 329248f219cSDavid Howells void rxrpc_incoming_call(struct rxrpc_sock *rx, 330248f219cSDavid Howells struct rxrpc_call *call, 33142886ffeSDavid Howells struct sk_buff *skb) 3328c3e34a4SDavid Howells { 333248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 33442886ffeSDavid Howells struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 335248f219cSDavid Howells u32 chan; 3368c3e34a4SDavid Howells 337248f219cSDavid Howells _enter(",%d", call->conn->debug_id); 3388c3e34a4SDavid Howells 339248f219cSDavid Howells rcu_assign_pointer(call->socket, rx); 340248f219cSDavid Howells call->call_id = sp->hdr.callNumber; 341248f219cSDavid Howells call->service_id = sp->hdr.serviceId; 342248f219cSDavid Howells call->cid = sp->hdr.cid; 343248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_ACCEPTING; 344248f219cSDavid Howells if (sp->hdr.securityIndex > 0) 345248f219cSDavid Howells call->state = RXRPC_CALL_SERVER_SECURING; 34657494343SDavid Howells call->cong_tstamp = skb->tstamp; 3478c3e34a4SDavid Howells 348248f219cSDavid Howells /* Set the channel for this call. We don't get channel_lock as we're 349248f219cSDavid Howells * only defending against the data_ready handler (which we're called 350248f219cSDavid Howells * from) and the RESPONSE packet parser (which is only really 351248f219cSDavid Howells * interested in call_counter and can cope with a disagreement with the 352248f219cSDavid Howells * call pointer). 3538c3e34a4SDavid Howells */ 354248f219cSDavid Howells chan = sp->hdr.cid & RXRPC_CHANNELMASK; 355248f219cSDavid Howells conn->channels[chan].call_counter = call->call_id; 356248f219cSDavid Howells conn->channels[chan].call_id = call->call_id; 357a1399f8bSDavid Howells rcu_assign_pointer(conn->channels[chan].call, call); 3588c3e34a4SDavid Howells 35985f32278SDavid Howells spin_lock(&conn->params.peer->lock); 360f3344303SDavid Howells hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); 36185f32278SDavid Howells spin_unlock(&conn->params.peer->lock); 3628c3e34a4SDavid Howells 3638c3e34a4SDavid Howells _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 3648c3e34a4SDavid Howells 365248f219cSDavid Howells rxrpc_start_call_timer(call); 366248f219cSDavid Howells _leave(""); 3678c3e34a4SDavid Howells } 3688c3e34a4SDavid Howells 3698c3e34a4SDavid Howells /* 3708d94aa38SDavid Howells * Queue a call's work processor, getting a ref to pass to the work queue. 3718d94aa38SDavid Howells */ 3728d94aa38SDavid Howells bool rxrpc_queue_call(struct rxrpc_call *call) 3738d94aa38SDavid Howells { 3748d94aa38SDavid Howells const void *here = __builtin_return_address(0); 375bfc18e38SMark Rutland int n = atomic_fetch_add_unless(&call->usage, 1, 0); 3768d94aa38SDavid Howells if (n == 0) 3778d94aa38SDavid Howells return false; 3788d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3792ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 3808d94aa38SDavid Howells else 3818d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3828d94aa38SDavid Howells return true; 3838d94aa38SDavid Howells } 3848d94aa38SDavid Howells 3858d94aa38SDavid Howells /* 3868d94aa38SDavid Howells * Queue a call's work processor, passing the callers ref to the work queue. 3878d94aa38SDavid Howells */ 3888d94aa38SDavid Howells bool __rxrpc_queue_call(struct rxrpc_call *call) 3898d94aa38SDavid Howells { 3908d94aa38SDavid Howells const void *here = __builtin_return_address(0); 3918d94aa38SDavid Howells int n = atomic_read(&call->usage); 3928d94aa38SDavid Howells ASSERTCMP(n, >=, 1); 3938d94aa38SDavid Howells if (rxrpc_queue_work(&call->processor)) 3942ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 3958d94aa38SDavid Howells else 3968d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_noqueue); 3978d94aa38SDavid Howells return true; 3988d94aa38SDavid Howells } 3998d94aa38SDavid Howells 4008d94aa38SDavid Howells /* 401e34d4234SDavid Howells * Note the re-emergence of a call. 402e34d4234SDavid Howells */ 403e34d4234SDavid Howells void rxrpc_see_call(struct rxrpc_call *call) 404e34d4234SDavid Howells { 405e34d4234SDavid Howells const void *here = __builtin_return_address(0); 406e34d4234SDavid Howells if (call) { 407e34d4234SDavid Howells int n = atomic_read(&call->usage); 408e34d4234SDavid Howells 4092ab27215SDavid Howells trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 410e34d4234SDavid Howells } 411e34d4234SDavid Howells } 412e34d4234SDavid Howells 413e34d4234SDavid Howells /* 414e34d4234SDavid Howells * Note the addition of a ref on a call. 415e34d4234SDavid Howells */ 416fff72429SDavid Howells void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 417e34d4234SDavid Howells { 418e34d4234SDavid Howells const void *here = __builtin_return_address(0); 419e34d4234SDavid Howells int n = atomic_inc_return(&call->usage); 420e34d4234SDavid Howells 4212ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 422e34d4234SDavid Howells } 423e34d4234SDavid Howells 424e34d4234SDavid Howells /* 425a641fd00SDavid Howells * Clean up the RxTx skb ring. 426a641fd00SDavid Howells */ 427a641fd00SDavid Howells static void rxrpc_cleanup_ring(struct rxrpc_call *call) 428a641fd00SDavid Howells { 429a641fd00SDavid Howells int i; 430a641fd00SDavid Howells 431a641fd00SDavid Howells for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 432a641fd00SDavid Howells rxrpc_free_skb(call->rxtx_buffer[i], 433a641fd00SDavid Howells (call->tx_phase ? rxrpc_skb_tx_cleaned : 434a641fd00SDavid Howells rxrpc_skb_rx_cleaned)); 435a641fd00SDavid Howells call->rxtx_buffer[i] = NULL; 436a641fd00SDavid Howells } 437a641fd00SDavid Howells } 438a641fd00SDavid Howells 439a641fd00SDavid Howells /* 440248f219cSDavid Howells * Detach a call from its owning socket. 4418c3e34a4SDavid Howells */ 4428d94aa38SDavid Howells void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 4438c3e34a4SDavid Howells { 444a84a46d7SDavid Howells const void *here = __builtin_return_address(0); 445248f219cSDavid Howells struct rxrpc_connection *conn = call->conn; 446248f219cSDavid Howells bool put = false; 447248f219cSDavid Howells 448248f219cSDavid Howells _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 449248f219cSDavid Howells 450a84a46d7SDavid Howells trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 451a84a46d7SDavid Howells here, (const void *)call->flags); 4528c3e34a4SDavid Howells 453a84a46d7SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 454e34d4234SDavid Howells 4558c3e34a4SDavid Howells spin_lock_bh(&call->lock); 4568c3e34a4SDavid Howells if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 4578c3e34a4SDavid Howells BUG(); 4588c3e34a4SDavid Howells spin_unlock_bh(&call->lock); 4598c3e34a4SDavid Howells 460248f219cSDavid Howells del_timer_sync(&call->timer); 4618c3e34a4SDavid Howells 462248f219cSDavid Howells /* Make sure we don't get any more notifications */ 463248f219cSDavid Howells write_lock_bh(&rx->recvmsg_lock); 464e653cfe4SDavid Howells 465248f219cSDavid Howells if (!list_empty(&call->recvmsg_link)) { 4668c3e34a4SDavid Howells _debug("unlinking once-pending call %p { e=%lx f=%lx }", 4678c3e34a4SDavid Howells call, call->events, call->flags); 468248f219cSDavid Howells list_del(&call->recvmsg_link); 469248f219cSDavid Howells put = true; 470248f219cSDavid Howells } 471248f219cSDavid Howells 472248f219cSDavid Howells /* list_empty() must return false in rxrpc_notify_socket() */ 473248f219cSDavid Howells call->recvmsg_link.next = NULL; 474248f219cSDavid Howells call->recvmsg_link.prev = NULL; 475248f219cSDavid Howells 476248f219cSDavid Howells write_unlock_bh(&rx->recvmsg_lock); 477248f219cSDavid Howells if (put) 478248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 479248f219cSDavid Howells 480248f219cSDavid Howells write_lock(&rx->call_lock); 481248f219cSDavid Howells 482248f219cSDavid Howells if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 4838c3e34a4SDavid Howells rb_erase(&call->sock_node, &rx->calls); 4848c3e34a4SDavid Howells memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 4858d94aa38SDavid Howells rxrpc_put_call(call, rxrpc_call_put_userid); 4868c3e34a4SDavid Howells } 4878c3e34a4SDavid Howells 488248f219cSDavid Howells list_del(&call->sock_link); 489248f219cSDavid Howells write_unlock(&rx->call_lock); 4908c3e34a4SDavid Howells 491248f219cSDavid Howells _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 4928c3e34a4SDavid Howells 493248f219cSDavid Howells if (conn) 494e653cfe4SDavid Howells rxrpc_disconnect_call(call); 495e653cfe4SDavid Howells 496a641fd00SDavid Howells rxrpc_cleanup_ring(call); 4978c3e34a4SDavid Howells _leave(""); 4988c3e34a4SDavid Howells } 4998c3e34a4SDavid Howells 5008c3e34a4SDavid Howells /* 5018c3e34a4SDavid Howells * release all the calls associated with a socket 5028c3e34a4SDavid Howells */ 5038c3e34a4SDavid Howells void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 5048c3e34a4SDavid Howells { 5058c3e34a4SDavid Howells struct rxrpc_call *call; 5068c3e34a4SDavid Howells 5078c3e34a4SDavid Howells _enter("%p", rx); 5088c3e34a4SDavid Howells 5090360da6dSDavid Howells while (!list_empty(&rx->to_be_accepted)) { 5100360da6dSDavid Howells call = list_entry(rx->to_be_accepted.next, 5110360da6dSDavid Howells struct rxrpc_call, accept_link); 5120360da6dSDavid Howells list_del(&call->accept_link); 5133a92789aSDavid Howells rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 5140360da6dSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5150360da6dSDavid Howells } 5160360da6dSDavid Howells 517248f219cSDavid Howells while (!list_empty(&rx->sock_calls)) { 518248f219cSDavid Howells call = list_entry(rx->sock_calls.next, 519248f219cSDavid Howells struct rxrpc_call, sock_link); 520248f219cSDavid Howells rxrpc_get_call(call, rxrpc_call_got); 5213a92789aSDavid Howells rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 52226cb02aaSDavid Howells rxrpc_send_abort_packet(call); 5238d94aa38SDavid Howells rxrpc_release_call(rx, call); 524248f219cSDavid Howells rxrpc_put_call(call, rxrpc_call_put); 5258c3e34a4SDavid Howells } 5268c3e34a4SDavid Howells 5278c3e34a4SDavid Howells _leave(""); 5288c3e34a4SDavid Howells } 5298c3e34a4SDavid Howells 5308c3e34a4SDavid Howells /* 5318c3e34a4SDavid Howells * release a call 5328c3e34a4SDavid Howells */ 533fff72429SDavid Howells void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 5348c3e34a4SDavid Howells { 535d3be4d24SDavid Howells struct rxrpc_net *rxnet = call->rxnet; 536e34d4234SDavid Howells const void *here = __builtin_return_address(0); 5372ab27215SDavid Howells int n; 538e34d4234SDavid Howells 5398c3e34a4SDavid Howells ASSERT(call != NULL); 5408c3e34a4SDavid Howells 541e34d4234SDavid Howells n = atomic_dec_return(&call->usage); 5422ab27215SDavid Howells trace_rxrpc_call(call, op, n, here, NULL); 543e34d4234SDavid Howells ASSERTCMP(n, >=, 0); 544e34d4234SDavid Howells if (n == 0) { 5458c3e34a4SDavid Howells _debug("call %d dead", call->debug_id); 546248f219cSDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 547e34d4234SDavid Howells 5482baec2c3SDavid Howells if (!list_empty(&call->link)) { 5492baec2c3SDavid Howells write_lock(&rxnet->call_lock); 550248f219cSDavid Howells list_del_init(&call->link); 5512baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 5522baec2c3SDavid Howells } 553e34d4234SDavid Howells 5548d94aa38SDavid Howells rxrpc_cleanup_call(call); 555e34d4234SDavid Howells } 5568c3e34a4SDavid Howells } 5578c3e34a4SDavid Howells 5588c3e34a4SDavid Howells /* 559dee46364SDavid Howells * Final call destruction under RCU. 560dee46364SDavid Howells */ 561dee46364SDavid Howells static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 562dee46364SDavid Howells { 563dee46364SDavid Howells struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 564d3be4d24SDavid Howells struct rxrpc_net *rxnet = call->rxnet; 565dee46364SDavid Howells 566df5d8bf7SDavid Howells rxrpc_put_peer(call->peer); 567248f219cSDavid Howells kfree(call->rxtx_buffer); 568248f219cSDavid Howells kfree(call->rxtx_annotations); 569dee46364SDavid Howells kmem_cache_free(rxrpc_call_jar, call); 570d3be4d24SDavid Howells if (atomic_dec_and_test(&rxnet->nr_calls)) 5715bb053beSLinus Torvalds wake_up_var(&rxnet->nr_calls); 572dee46364SDavid Howells } 573dee46364SDavid Howells 574dee46364SDavid Howells /* 5758c3e34a4SDavid Howells * clean up a call 5768c3e34a4SDavid Howells */ 57700e90712SDavid Howells void rxrpc_cleanup_call(struct rxrpc_call *call) 5788c3e34a4SDavid Howells { 579248f219cSDavid Howells _net("DESTROY CALL %d", call->debug_id); 5808c3e34a4SDavid Howells 5818c3e34a4SDavid Howells memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 5828c3e34a4SDavid Howells 583248f219cSDavid Howells del_timer_sync(&call->timer); 5848c3e34a4SDavid Howells 5858d94aa38SDavid Howells ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 5868c3e34a4SDavid Howells ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 587e653cfe4SDavid Howells ASSERTCMP(call->conn, ==, NULL); 5888c3e34a4SDavid Howells 589a641fd00SDavid Howells rxrpc_cleanup_ring(call); 59071f3ca40SDavid Howells rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 5918c3e34a4SDavid Howells 592dee46364SDavid Howells call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 5938c3e34a4SDavid Howells } 5948c3e34a4SDavid Howells 5958c3e34a4SDavid Howells /* 5962baec2c3SDavid Howells * Make sure that all calls are gone from a network namespace. To reach this 5972baec2c3SDavid Howells * point, any open UDP sockets in that namespace must have been closed, so any 5982baec2c3SDavid Howells * outstanding calls cannot be doing I/O. 5998c3e34a4SDavid Howells */ 6002baec2c3SDavid Howells void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 6018c3e34a4SDavid Howells { 6028c3e34a4SDavid Howells struct rxrpc_call *call; 6038c3e34a4SDavid Howells 6048c3e34a4SDavid Howells _enter(""); 6058d94aa38SDavid Howells 606b1302342SDavid Howells if (!list_empty(&rxnet->calls)) { 6072baec2c3SDavid Howells write_lock(&rxnet->call_lock); 6088c3e34a4SDavid Howells 6092baec2c3SDavid Howells while (!list_empty(&rxnet->calls)) { 610b1302342SDavid Howells call = list_entry(rxnet->calls.next, 611b1302342SDavid Howells struct rxrpc_call, link); 6128c3e34a4SDavid Howells _debug("Zapping call %p", call); 6138c3e34a4SDavid Howells 614e34d4234SDavid Howells rxrpc_see_call(call); 6158c3e34a4SDavid Howells list_del_init(&call->link); 6168c3e34a4SDavid Howells 617248f219cSDavid Howells pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 6188c3e34a4SDavid Howells call, atomic_read(&call->usage), 6198c3e34a4SDavid Howells rxrpc_call_states[call->state], 6208c3e34a4SDavid Howells call->flags, call->events); 6218c3e34a4SDavid Howells 6222baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 6238c3e34a4SDavid Howells cond_resched(); 6242baec2c3SDavid Howells write_lock(&rxnet->call_lock); 6258c3e34a4SDavid Howells } 6268c3e34a4SDavid Howells 6272baec2c3SDavid Howells write_unlock(&rxnet->call_lock); 628b1302342SDavid Howells } 629d3be4d24SDavid Howells 630d3be4d24SDavid Howells atomic_dec(&rxnet->nr_calls); 6315bb053beSLinus Torvalds wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 6328c3e34a4SDavid Howells } 633