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703 lines
18 KiB
703 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* RxRPC individual remote procedure call handling |
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* |
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/circ_buf.h> |
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#include <linux/spinlock_types.h> |
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#include <net/sock.h> |
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#include <net/af_rxrpc.h> |
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#include "ar-internal.h" |
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const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { |
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[RXRPC_CALL_UNINITIALISED] = "Uninit ", |
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[RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", |
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[RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
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[RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", |
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[RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", |
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[RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", |
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[RXRPC_CALL_SERVER_SECURING] = "SvSecure", |
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[RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", |
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[RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", |
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[RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", |
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[RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", |
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[RXRPC_CALL_COMPLETE] = "Complete", |
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}; |
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const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { |
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[RXRPC_CALL_SUCCEEDED] = "Complete", |
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[RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", |
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[RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", |
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[RXRPC_CALL_LOCAL_ERROR] = "LocError", |
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[RXRPC_CALL_NETWORK_ERROR] = "NetError", |
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}; |
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struct kmem_cache *rxrpc_call_jar; |
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static struct semaphore rxrpc_call_limiter = |
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__SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000); |
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static struct semaphore rxrpc_kernel_call_limiter = |
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__SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000); |
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static void rxrpc_call_timer_expired(struct timer_list *t) |
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{ |
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struct rxrpc_call *call = from_timer(call, t, timer); |
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_enter("%d", call->debug_id); |
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if (call->state < RXRPC_CALL_COMPLETE) { |
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trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); |
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rxrpc_queue_call(call); |
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} |
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} |
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static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; |
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/* |
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* find an extant server call |
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* - called in process context with IRQs enabled |
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*/ |
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struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, |
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unsigned long user_call_ID) |
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{ |
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struct rxrpc_call *call; |
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struct rb_node *p; |
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_enter("%p,%lx", rx, user_call_ID); |
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read_lock(&rx->call_lock); |
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p = rx->calls.rb_node; |
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while (p) { |
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call = rb_entry(p, struct rxrpc_call, sock_node); |
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if (user_call_ID < call->user_call_ID) |
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p = p->rb_left; |
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else if (user_call_ID > call->user_call_ID) |
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p = p->rb_right; |
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else |
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goto found_extant_call; |
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} |
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read_unlock(&rx->call_lock); |
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_leave(" = NULL"); |
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return NULL; |
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found_extant_call: |
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rxrpc_get_call(call, rxrpc_call_got); |
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read_unlock(&rx->call_lock); |
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_leave(" = %p [%d]", call, atomic_read(&call->usage)); |
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return call; |
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} |
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/* |
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* allocate a new call |
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*/ |
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struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, |
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unsigned int debug_id) |
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{ |
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struct rxrpc_call *call; |
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struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); |
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call = kmem_cache_zalloc(rxrpc_call_jar, gfp); |
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if (!call) |
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return NULL; |
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call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, |
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sizeof(struct sk_buff *), |
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gfp); |
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if (!call->rxtx_buffer) |
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goto nomem; |
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call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); |
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if (!call->rxtx_annotations) |
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goto nomem_2; |
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mutex_init(&call->user_mutex); |
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/* Prevent lockdep reporting a deadlock false positive between the afs |
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* filesystem and sys_sendmsg() via the mmap sem. |
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*/ |
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if (rx->sk.sk_kern_sock) |
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lockdep_set_class(&call->user_mutex, |
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&rxrpc_call_user_mutex_lock_class_key); |
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timer_setup(&call->timer, rxrpc_call_timer_expired, 0); |
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INIT_WORK(&call->processor, &rxrpc_process_call); |
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INIT_LIST_HEAD(&call->link); |
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INIT_LIST_HEAD(&call->chan_wait_link); |
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INIT_LIST_HEAD(&call->accept_link); |
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INIT_LIST_HEAD(&call->recvmsg_link); |
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INIT_LIST_HEAD(&call->sock_link); |
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init_waitqueue_head(&call->waitq); |
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spin_lock_init(&call->lock); |
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spin_lock_init(&call->notify_lock); |
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spin_lock_init(&call->input_lock); |
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rwlock_init(&call->state_lock); |
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atomic_set(&call->usage, 1); |
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call->debug_id = debug_id; |
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call->tx_total_len = -1; |
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call->next_rx_timo = 20 * HZ; |
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call->next_req_timo = 1 * HZ; |
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memset(&call->sock_node, 0xed, sizeof(call->sock_node)); |
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/* Leave space in the ring to handle a maxed-out jumbo packet */ |
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call->rx_winsize = rxrpc_rx_window_size; |
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call->tx_winsize = 16; |
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call->rx_expect_next = 1; |
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call->cong_cwnd = 2; |
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call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; |
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call->rxnet = rxnet; |
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call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; |
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atomic_inc(&rxnet->nr_calls); |
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return call; |
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nomem_2: |
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kfree(call->rxtx_buffer); |
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nomem: |
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kmem_cache_free(rxrpc_call_jar, call); |
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return NULL; |
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} |
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/* |
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* Allocate a new client call. |
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*/ |
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static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
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struct sockaddr_rxrpc *srx, |
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gfp_t gfp, |
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unsigned int debug_id) |
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{ |
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struct rxrpc_call *call; |
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ktime_t now; |
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_enter(""); |
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call = rxrpc_alloc_call(rx, gfp, debug_id); |
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if (!call) |
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return ERR_PTR(-ENOMEM); |
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call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; |
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call->service_id = srx->srx_service; |
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call->tx_phase = true; |
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now = ktime_get_real(); |
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call->acks_latest_ts = now; |
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call->cong_tstamp = now; |
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_leave(" = %p", call); |
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return call; |
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} |
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/* |
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* Initiate the call ack/resend/expiry timer. |
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*/ |
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static void rxrpc_start_call_timer(struct rxrpc_call *call) |
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{ |
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unsigned long now = jiffies; |
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unsigned long j = now + MAX_JIFFY_OFFSET; |
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call->ack_at = j; |
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call->ack_lost_at = j; |
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call->resend_at = j; |
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call->ping_at = j; |
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call->expect_rx_by = j; |
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call->expect_req_by = j; |
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call->expect_term_by = j; |
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call->timer.expires = now; |
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} |
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/* |
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* Wait for a call slot to become available. |
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*/ |
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static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) |
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{ |
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struct semaphore *limiter = &rxrpc_call_limiter; |
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if (p->kernel) |
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limiter = &rxrpc_kernel_call_limiter; |
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if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { |
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down(limiter); |
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return limiter; |
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} |
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return down_interruptible(limiter) < 0 ? NULL : limiter; |
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} |
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/* |
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* Release a call slot. |
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*/ |
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static void rxrpc_put_call_slot(struct rxrpc_call *call) |
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{ |
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struct semaphore *limiter = &rxrpc_call_limiter; |
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if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) |
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limiter = &rxrpc_kernel_call_limiter; |
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up(limiter); |
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} |
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/* |
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* Set up a call for the given parameters. |
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* - Called with the socket lock held, which it must release. |
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* - If it returns a call, the call's lock will need releasing by the caller. |
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*/ |
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struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
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struct rxrpc_conn_parameters *cp, |
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struct sockaddr_rxrpc *srx, |
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struct rxrpc_call_params *p, |
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gfp_t gfp, |
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unsigned int debug_id) |
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__releases(&rx->sk.sk_lock.slock) |
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__acquires(&call->user_mutex) |
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{ |
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struct rxrpc_call *call, *xcall; |
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struct rxrpc_net *rxnet; |
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struct semaphore *limiter; |
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struct rb_node *parent, **pp; |
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const void *here = __builtin_return_address(0); |
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int ret; |
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_enter("%p,%lx", rx, p->user_call_ID); |
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limiter = rxrpc_get_call_slot(p, gfp); |
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if (!limiter) |
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return ERR_PTR(-ERESTARTSYS); |
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call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); |
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if (IS_ERR(call)) { |
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release_sock(&rx->sk); |
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up(limiter); |
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_leave(" = %ld", PTR_ERR(call)); |
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return call; |
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} |
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call->interruptibility = p->interruptibility; |
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call->tx_total_len = p->tx_total_len; |
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trace_rxrpc_call(call->debug_id, rxrpc_call_new_client, |
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atomic_read(&call->usage), |
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here, (const void *)p->user_call_ID); |
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if (p->kernel) |
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__set_bit(RXRPC_CALL_KERNEL, &call->flags); |
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/* We need to protect a partially set up call against the user as we |
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* will be acting outside the socket lock. |
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*/ |
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mutex_lock(&call->user_mutex); |
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/* Publish the call, even though it is incompletely set up as yet */ |
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write_lock(&rx->call_lock); |
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pp = &rx->calls.rb_node; |
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parent = NULL; |
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while (*pp) { |
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parent = *pp; |
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xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
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if (p->user_call_ID < xcall->user_call_ID) |
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pp = &(*pp)->rb_left; |
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else if (p->user_call_ID > xcall->user_call_ID) |
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pp = &(*pp)->rb_right; |
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else |
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goto error_dup_user_ID; |
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} |
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rcu_assign_pointer(call->socket, rx); |
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call->user_call_ID = p->user_call_ID; |
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__set_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
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rxrpc_get_call(call, rxrpc_call_got_userid); |
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rb_link_node(&call->sock_node, parent, pp); |
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rb_insert_color(&call->sock_node, &rx->calls); |
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list_add(&call->sock_link, &rx->sock_calls); |
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write_unlock(&rx->call_lock); |
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rxnet = call->rxnet; |
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write_lock(&rxnet->call_lock); |
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list_add_tail(&call->link, &rxnet->calls); |
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write_unlock(&rxnet->call_lock); |
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/* From this point on, the call is protected by its own lock. */ |
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release_sock(&rx->sk); |
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/* Set up or get a connection record and set the protocol parameters, |
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* including channel number and call ID. |
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*/ |
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ret = rxrpc_connect_call(rx, call, cp, srx, gfp); |
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if (ret < 0) |
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goto error_attached_to_socket; |
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trace_rxrpc_call(call->debug_id, rxrpc_call_connected, |
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atomic_read(&call->usage), here, NULL); |
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rxrpc_start_call_timer(call); |
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_net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); |
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_leave(" = %p [new]", call); |
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return call; |
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/* We unexpectedly found the user ID in the list after taking |
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* the call_lock. This shouldn't happen unless the user races |
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* with itself and tries to add the same user ID twice at the |
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* same time in different threads. |
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*/ |
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error_dup_user_ID: |
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write_unlock(&rx->call_lock); |
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release_sock(&rx->sk); |
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__rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, |
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RX_CALL_DEAD, -EEXIST); |
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trace_rxrpc_call(call->debug_id, rxrpc_call_error, |
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atomic_read(&call->usage), here, ERR_PTR(-EEXIST)); |
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rxrpc_release_call(rx, call); |
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mutex_unlock(&call->user_mutex); |
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rxrpc_put_call(call, rxrpc_call_put); |
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_leave(" = -EEXIST"); |
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return ERR_PTR(-EEXIST); |
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/* We got an error, but the call is attached to the socket and is in |
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* need of release. However, we might now race with recvmsg() when |
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* completing the call queues it. Return 0 from sys_sendmsg() and |
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* leave the error to recvmsg() to deal with. |
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*/ |
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error_attached_to_socket: |
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trace_rxrpc_call(call->debug_id, rxrpc_call_error, |
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atomic_read(&call->usage), here, ERR_PTR(ret)); |
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set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); |
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__rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, |
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RX_CALL_DEAD, ret); |
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_leave(" = c=%08x [err]", call->debug_id); |
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return call; |
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} |
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/* |
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* Set up an incoming call. call->conn points to the connection. |
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* This is called in BH context and isn't allowed to fail. |
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*/ |
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void rxrpc_incoming_call(struct rxrpc_sock *rx, |
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struct rxrpc_call *call, |
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struct sk_buff *skb) |
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{ |
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struct rxrpc_connection *conn = call->conn; |
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
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u32 chan; |
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_enter(",%d", call->conn->debug_id); |
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rcu_assign_pointer(call->socket, rx); |
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call->call_id = sp->hdr.callNumber; |
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call->service_id = sp->hdr.serviceId; |
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call->cid = sp->hdr.cid; |
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call->state = RXRPC_CALL_SERVER_SECURING; |
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call->cong_tstamp = skb->tstamp; |
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/* Set the channel for this call. We don't get channel_lock as we're |
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* only defending against the data_ready handler (which we're called |
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* from) and the RESPONSE packet parser (which is only really |
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* interested in call_counter and can cope with a disagreement with the |
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* call pointer). |
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*/ |
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chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
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conn->channels[chan].call_counter = call->call_id; |
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conn->channels[chan].call_id = call->call_id; |
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rcu_assign_pointer(conn->channels[chan].call, call); |
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spin_lock(&conn->params.peer->lock); |
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hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); |
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spin_unlock(&conn->params.peer->lock); |
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_net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
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rxrpc_start_call_timer(call); |
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_leave(""); |
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} |
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/* |
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* Queue a call's work processor, getting a ref to pass to the work queue. |
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*/ |
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bool rxrpc_queue_call(struct rxrpc_call *call) |
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{ |
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const void *here = __builtin_return_address(0); |
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int n = atomic_fetch_add_unless(&call->usage, 1, 0); |
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if (n == 0) |
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return false; |
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if (rxrpc_queue_work(&call->processor)) |
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trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1, |
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here, NULL); |
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else |
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rxrpc_put_call(call, rxrpc_call_put_noqueue); |
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return true; |
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} |
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/* |
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* Queue a call's work processor, passing the callers ref to the work queue. |
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*/ |
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bool __rxrpc_queue_call(struct rxrpc_call *call) |
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{ |
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const void *here = __builtin_return_address(0); |
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int n = atomic_read(&call->usage); |
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ASSERTCMP(n, >=, 1); |
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if (rxrpc_queue_work(&call->processor)) |
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trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n, |
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here, NULL); |
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else |
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rxrpc_put_call(call, rxrpc_call_put_noqueue); |
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return true; |
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} |
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/* |
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* Note the re-emergence of a call. |
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*/ |
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void rxrpc_see_call(struct rxrpc_call *call) |
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{ |
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const void *here = __builtin_return_address(0); |
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if (call) { |
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int n = atomic_read(&call->usage); |
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trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n, |
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here, NULL); |
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} |
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} |
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/* |
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* Note the addition of a ref on a call. |
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*/ |
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void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
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{ |
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const void *here = __builtin_return_address(0); |
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int n = atomic_inc_return(&call->usage); |
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trace_rxrpc_call(call->debug_id, op, n, here, NULL); |
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} |
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|
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/* |
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* Clean up the RxTx skb ring. |
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*/ |
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static void rxrpc_cleanup_ring(struct rxrpc_call *call) |
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{ |
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int i; |
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for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { |
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rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned); |
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call->rxtx_buffer[i] = NULL; |
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} |
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} |
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/* |
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* Detach a call from its owning socket. |
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*/ |
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void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
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{ |
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const void *here = __builtin_return_address(0); |
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struct rxrpc_connection *conn = call->conn; |
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bool put = false; |
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_enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); |
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trace_rxrpc_call(call->debug_id, rxrpc_call_release, |
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atomic_read(&call->usage), |
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here, (const void *)call->flags); |
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ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
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spin_lock_bh(&call->lock); |
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if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) |
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BUG(); |
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spin_unlock_bh(&call->lock); |
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rxrpc_put_call_slot(call); |
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del_timer_sync(&call->timer); |
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|
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/* Make sure we don't get any more notifications */ |
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write_lock_bh(&rx->recvmsg_lock); |
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if (!list_empty(&call->recvmsg_link)) { |
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_debug("unlinking once-pending call %p { e=%lx f=%lx }", |
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call, call->events, call->flags); |
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list_del(&call->recvmsg_link); |
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put = true; |
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} |
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|
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/* list_empty() must return false in rxrpc_notify_socket() */ |
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call->recvmsg_link.next = NULL; |
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call->recvmsg_link.prev = NULL; |
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|
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write_unlock_bh(&rx->recvmsg_lock); |
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if (put) |
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rxrpc_put_call(call, rxrpc_call_put); |
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|
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write_lock(&rx->call_lock); |
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|
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if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { |
|
rb_erase(&call->sock_node, &rx->calls); |
|
memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); |
|
rxrpc_put_call(call, rxrpc_call_put_userid); |
|
} |
|
|
|
list_del(&call->sock_link); |
|
write_unlock(&rx->call_lock); |
|
|
|
_debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); |
|
|
|
if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
|
rxrpc_disconnect_call(call); |
|
if (call->security) |
|
call->security->free_call_crypto(call); |
|
_leave(""); |
|
} |
|
|
|
/* |
|
* release all the calls associated with a socket |
|
*/ |
|
void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) |
|
{ |
|
struct rxrpc_call *call; |
|
|
|
_enter("%p", rx); |
|
|
|
while (!list_empty(&rx->to_be_accepted)) { |
|
call = list_entry(rx->to_be_accepted.next, |
|
struct rxrpc_call, accept_link); |
|
list_del(&call->accept_link); |
|
rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); |
|
rxrpc_put_call(call, rxrpc_call_put); |
|
} |
|
|
|
while (!list_empty(&rx->sock_calls)) { |
|
call = list_entry(rx->sock_calls.next, |
|
struct rxrpc_call, sock_link); |
|
rxrpc_get_call(call, rxrpc_call_got); |
|
rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); |
|
rxrpc_send_abort_packet(call); |
|
rxrpc_release_call(rx, call); |
|
rxrpc_put_call(call, rxrpc_call_put); |
|
} |
|
|
|
_leave(""); |
|
} |
|
|
|
/* |
|
* release a call |
|
*/ |
|
void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
|
{ |
|
struct rxrpc_net *rxnet = call->rxnet; |
|
const void *here = __builtin_return_address(0); |
|
unsigned int debug_id = call->debug_id; |
|
int n; |
|
|
|
ASSERT(call != NULL); |
|
|
|
n = atomic_dec_return(&call->usage); |
|
trace_rxrpc_call(debug_id, op, n, here, NULL); |
|
ASSERTCMP(n, >=, 0); |
|
if (n == 0) { |
|
_debug("call %d dead", call->debug_id); |
|
ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
|
|
|
if (!list_empty(&call->link)) { |
|
write_lock(&rxnet->call_lock); |
|
list_del_init(&call->link); |
|
write_unlock(&rxnet->call_lock); |
|
} |
|
|
|
rxrpc_cleanup_call(call); |
|
} |
|
} |
|
|
|
/* |
|
* Final call destruction - but must be done in process context. |
|
*/ |
|
static void rxrpc_destroy_call(struct work_struct *work) |
|
{ |
|
struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor); |
|
struct rxrpc_net *rxnet = call->rxnet; |
|
|
|
rxrpc_put_connection(call->conn); |
|
rxrpc_put_peer(call->peer); |
|
kfree(call->rxtx_buffer); |
|
kfree(call->rxtx_annotations); |
|
kmem_cache_free(rxrpc_call_jar, call); |
|
if (atomic_dec_and_test(&rxnet->nr_calls)) |
|
wake_up_var(&rxnet->nr_calls); |
|
} |
|
|
|
/* |
|
* Final call destruction under RCU. |
|
*/ |
|
static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) |
|
{ |
|
struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); |
|
|
|
if (in_softirq()) { |
|
INIT_WORK(&call->processor, rxrpc_destroy_call); |
|
if (!rxrpc_queue_work(&call->processor)) |
|
BUG(); |
|
} else { |
|
rxrpc_destroy_call(&call->processor); |
|
} |
|
} |
|
|
|
/* |
|
* clean up a call |
|
*/ |
|
void rxrpc_cleanup_call(struct rxrpc_call *call) |
|
{ |
|
_net("DESTROY CALL %d", call->debug_id); |
|
|
|
memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); |
|
|
|
del_timer_sync(&call->timer); |
|
|
|
ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
|
ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
|
|
|
rxrpc_cleanup_ring(call); |
|
rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned); |
|
|
|
call_rcu(&call->rcu, rxrpc_rcu_destroy_call); |
|
} |
|
|
|
/* |
|
* Make sure that all calls are gone from a network namespace. To reach this |
|
* point, any open UDP sockets in that namespace must have been closed, so any |
|
* outstanding calls cannot be doing I/O. |
|
*/ |
|
void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) |
|
{ |
|
struct rxrpc_call *call; |
|
|
|
_enter(""); |
|
|
|
if (!list_empty(&rxnet->calls)) { |
|
write_lock(&rxnet->call_lock); |
|
|
|
while (!list_empty(&rxnet->calls)) { |
|
call = list_entry(rxnet->calls.next, |
|
struct rxrpc_call, link); |
|
_debug("Zapping call %p", call); |
|
|
|
rxrpc_see_call(call); |
|
list_del_init(&call->link); |
|
|
|
pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", |
|
call, atomic_read(&call->usage), |
|
rxrpc_call_states[call->state], |
|
call->flags, call->events); |
|
|
|
write_unlock(&rxnet->call_lock); |
|
cond_resched(); |
|
write_lock(&rxnet->call_lock); |
|
} |
|
|
|
write_unlock(&rxnet->call_lock); |
|
} |
|
|
|
atomic_dec(&rxnet->nr_calls); |
|
wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); |
|
}
|
|
|