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![David Howells](/assets/img/avatar_default.png)
At the end of rxrpc_release_call(), rxrpc_cleanup_ring() is called to clear
the Rx/Tx skbuff ring, but this doesn't lock the ring whilst it's accessing
it. Unfortunately, rxrpc_resend() might be trying to retransmit a packet
concurrently with this - and whilst it does lock the ring, this isn't
protection against rxrpc_cleanup_call().
Fix this by removing the call to rxrpc_cleanup_ring() from
rxrpc_release_call(). rxrpc_cleanup_ring() will be called again anyway
from rxrpc_cleanup_call(). The earlier call is just an optimisation to
recycle skbuffs more quickly.
Alternative solutions include rxrpc_release_call() could try to cancel the
work item or wait for it to complete or rxrpc_cleanup_ring() could lock
when accessing the ring (which would require a bh lock).
This can produce a report like the following:
BUG: KASAN: use-after-free in rxrpc_send_data_packet+0x19b4/0x1e70 net/rxrpc/output.c:372
Read of size 4 at addr ffff888011606e04 by task kworker/0:0/5
...
Workqueue: krxrpcd rxrpc_process_call
Call Trace:
...
kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
rxrpc_send_data_packet+0x19b4/0x1e70 net/rxrpc/output.c:372
rxrpc_resend net/rxrpc/call_event.c:266 [inline]
rxrpc_process_call+0x1634/0x1f60 net/rxrpc/call_event.c:412
process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
...
Allocated by task 2318:
...
sock_alloc_send_pskb+0x793/0x920 net/core/sock.c:2348
rxrpc_send_data+0xb51/0x2bf0 net/rxrpc/sendmsg.c:358
rxrpc_do_sendmsg+0xc03/0x1350 net/rxrpc/sendmsg.c:744
rxrpc_sendmsg+0x420/0x630 net/rxrpc/af_rxrpc.c:560
...
Freed by task 2318:
...
kfree_skb+0x140/0x3f0 net/core/skbuff.c:704
rxrpc_free_skb+0x11d/0x150 net/rxrpc/skbuff.c:78
rxrpc_cleanup_ring net/rxrpc/call_object.c:485 [inline]
rxrpc_release_call+0x5dd/0x860 net/rxrpc/call_object.c:552
rxrpc_release_calls_on_socket+0x21c/0x300 net/rxrpc/call_object.c:579
rxrpc_release_sock net/rxrpc/af_rxrpc.c:885 [inline]
rxrpc_release+0x263/0x5a0 net/rxrpc/af_rxrpc.c:916
__sock_release+0xcd/0x280 net/socket.c:597
...
The buggy address belongs to the object at ffff888011606dc0
which belongs to the cache skbuff_head_cache of size 232
Fixes: 248f219cb8
("rxrpc: Rewrite the data and ack handling code")
Reported-by: syzbot+174de899852504e4a74a@syzkaller.appspotmail.com
Reported-by: syzbot+3d1c772efafd3c38d007@syzkaller.appspotmail.com
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Hillf Danton <hdanton@sina.com>
Link: https://lore.kernel.org/r/161234207610.653119.5287360098400436976.stgit@warthog.procyon.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
703 lines
18 KiB
C
703 lines
18 KiB
C
// 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 (dhowells@redhat.com)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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);
|
|
|
|
_net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
|
|
|
|
rxrpc_start_call_timer(call);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* Queue a call's work processor, getting a ref to pass to the work queue.
|
|
*/
|
|
bool rxrpc_queue_call(struct rxrpc_call *call)
|
|
{
|
|
const void *here = __builtin_return_address(0);
|
|
int n = atomic_fetch_add_unless(&call->usage, 1, 0);
|
|
if (n == 0)
|
|
return false;
|
|
if (rxrpc_queue_work(&call->processor))
|
|
trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1,
|
|
here, NULL);
|
|
else
|
|
rxrpc_put_call(call, rxrpc_call_put_noqueue);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Queue a call's work processor, passing the callers ref to the work queue.
|
|
*/
|
|
bool __rxrpc_queue_call(struct rxrpc_call *call)
|
|
{
|
|
const void *here = __builtin_return_address(0);
|
|
int n = atomic_read(&call->usage);
|
|
ASSERTCMP(n, >=, 1);
|
|
if (rxrpc_queue_work(&call->processor))
|
|
trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n,
|
|
here, NULL);
|
|
else
|
|
rxrpc_put_call(call, rxrpc_call_put_noqueue);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Note the re-emergence of a call.
|
|
*/
|
|
void rxrpc_see_call(struct rxrpc_call *call)
|
|
{
|
|
const void *here = __builtin_return_address(0);
|
|
if (call) {
|
|
int n = atomic_read(&call->usage);
|
|
|
|
trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n,
|
|
here, NULL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Note the addition of a ref on a call.
|
|
*/
|
|
void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
|
|
{
|
|
const void *here = __builtin_return_address(0);
|
|
int n = atomic_inc_return(&call->usage);
|
|
|
|
trace_rxrpc_call(call->debug_id, op, n, here, NULL);
|
|
}
|
|
|
|
/*
|
|
* Clean up the RxTx skb ring.
|
|
*/
|
|
static void rxrpc_cleanup_ring(struct rxrpc_call *call)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
|
|
rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned);
|
|
call->rxtx_buffer[i] = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Detach a call from its owning socket.
|
|
*/
|
|
void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
|
|
{
|
|
const void *here = __builtin_return_address(0);
|
|
struct rxrpc_connection *conn = call->conn;
|
|
bool put = false;
|
|
|
|
_enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
|
|
|
|
trace_rxrpc_call(call->debug_id, rxrpc_call_release,
|
|
atomic_read(&call->usage),
|
|
here, (const void *)call->flags);
|
|
|
|
ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
|
|
|
|
spin_lock_bh(&call->lock);
|
|
if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
|
|
BUG();
|
|
spin_unlock_bh(&call->lock);
|
|
|
|
rxrpc_put_call_slot(call);
|
|
|
|
del_timer_sync(&call->timer);
|
|
|
|
/* Make sure we don't get any more notifications */
|
|
write_lock_bh(&rx->recvmsg_lock);
|
|
|
|
if (!list_empty(&call->recvmsg_link)) {
|
|
_debug("unlinking once-pending call %p { e=%lx f=%lx }",
|
|
call, call->events, call->flags);
|
|
list_del(&call->recvmsg_link);
|
|
put = true;
|
|
}
|
|
|
|
/* list_empty() must return false in rxrpc_notify_socket() */
|
|
call->recvmsg_link.next = NULL;
|
|
call->recvmsg_link.prev = NULL;
|
|
|
|
write_unlock_bh(&rx->recvmsg_lock);
|
|
if (put)
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
|
|
write_lock(&rx->call_lock);
|
|
|
|
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));
|
|
}
|