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![David Howells](/assets/img/avatar_default.png)
afs_make_call() calls rxrpc_kernel_begin_call() to begin a call (which may
get stalled in the background waiting for a connection to become
available); it then calls rxrpc_kernel_set_max_life() to set the timeouts -
but that starts the call timer so the call timer might then expire before
we get a connection assigned - leading to the following oops if the call
stalled:
BUG: kernel NULL pointer dereference, address: 0000000000000000
...
CPU: 1 PID: 5111 Comm: krxrpcio/0 Not tainted 6.3.0-rc7-build3+ #701
RIP: 0010:rxrpc_alloc_txbuf+0xc0/0x157
...
Call Trace:
<TASK>
rxrpc_send_ACK+0x50/0x13b
rxrpc_input_call_event+0x16a/0x67d
rxrpc_io_thread+0x1b6/0x45f
? _raw_spin_unlock_irqrestore+0x1f/0x35
? rxrpc_input_packet+0x519/0x519
kthread+0xe7/0xef
? kthread_complete_and_exit+0x1b/0x1b
ret_from_fork+0x22/0x30
Fix this by noting the timeouts in struct rxrpc_call when the call is
created. The timer will be started when the first packet is transmitted.
It shouldn't be possible to trigger this directly from userspace through
AF_RXRPC as sendmsg() will return EBUSY if the call is in the
waiting-for-conn state if it dropped out of the wait due to a signal.
Fixes: 9d35d880e0
("rxrpc: Move client call connection to the I/O thread")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
824 lines
21 KiB
C
824 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* AF_RXRPC sendmsg() implementation.
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*
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* Copyright (C) 2007, 2016 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/net.h>
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#include <linux/gfp.h>
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#include <linux/skbuff.h>
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#include <linux/export.h>
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#include <linux/sched/signal.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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/*
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* Propose an abort to be made in the I/O thread.
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*/
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bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
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enum rxrpc_abort_reason why)
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{
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_enter("{%d},%d,%d,%u", call->debug_id, abort_code, error, why);
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if (!call->send_abort && !rxrpc_call_is_complete(call)) {
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call->send_abort_why = why;
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call->send_abort_err = error;
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call->send_abort_seq = 0;
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/* Request abort locklessly vs rxrpc_input_call_event(). */
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smp_store_release(&call->send_abort, abort_code);
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rxrpc_poke_call(call, rxrpc_call_poke_abort);
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return true;
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}
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return false;
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}
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/*
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* Wait for a call to become connected. Interruption here doesn't cause the
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* call to be aborted.
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*/
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static int rxrpc_wait_to_be_connected(struct rxrpc_call *call, long *timeo)
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{
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DECLARE_WAITQUEUE(myself, current);
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int ret = 0;
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_enter("%d", call->debug_id);
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if (rxrpc_call_state(call) != RXRPC_CALL_CLIENT_AWAIT_CONN)
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goto no_wait;
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add_wait_queue_exclusive(&call->waitq, &myself);
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for (;;) {
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switch (call->interruptibility) {
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case RXRPC_INTERRUPTIBLE:
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case RXRPC_PREINTERRUPTIBLE:
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set_current_state(TASK_INTERRUPTIBLE);
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break;
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case RXRPC_UNINTERRUPTIBLE:
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default:
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set_current_state(TASK_UNINTERRUPTIBLE);
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break;
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}
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if (rxrpc_call_state(call) != RXRPC_CALL_CLIENT_AWAIT_CONN)
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break;
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if ((call->interruptibility == RXRPC_INTERRUPTIBLE ||
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call->interruptibility == RXRPC_PREINTERRUPTIBLE) &&
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signal_pending(current)) {
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ret = sock_intr_errno(*timeo);
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break;
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}
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*timeo = schedule_timeout(*timeo);
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}
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remove_wait_queue(&call->waitq, &myself);
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__set_current_state(TASK_RUNNING);
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no_wait:
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if (ret == 0 && rxrpc_call_is_complete(call))
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ret = call->error;
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* Return true if there's sufficient Tx queue space.
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*/
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static bool rxrpc_check_tx_space(struct rxrpc_call *call, rxrpc_seq_t *_tx_win)
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{
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if (_tx_win)
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*_tx_win = call->tx_bottom;
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return call->tx_prepared - call->tx_bottom < 256;
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}
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/*
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* Wait for space to appear in the Tx queue or a signal to occur.
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*/
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static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
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struct rxrpc_call *call,
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long *timeo)
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{
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for (;;) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (rxrpc_check_tx_space(call, NULL))
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return 0;
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if (rxrpc_call_is_complete(call))
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return call->error;
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if (signal_pending(current))
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return sock_intr_errno(*timeo);
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trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
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*timeo = schedule_timeout(*timeo);
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}
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}
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/*
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* Wait for space to appear in the Tx queue uninterruptibly, but with
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* a timeout of 2*RTT if no progress was made and a signal occurred.
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*/
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static int rxrpc_wait_for_tx_window_waitall(struct rxrpc_sock *rx,
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struct rxrpc_call *call)
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{
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rxrpc_seq_t tx_start, tx_win;
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signed long rtt, timeout;
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rtt = READ_ONCE(call->peer->srtt_us) >> 3;
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rtt = usecs_to_jiffies(rtt) * 2;
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if (rtt < 2)
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rtt = 2;
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timeout = rtt;
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tx_start = smp_load_acquire(&call->acks_hard_ack);
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for (;;) {
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set_current_state(TASK_UNINTERRUPTIBLE);
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if (rxrpc_check_tx_space(call, &tx_win))
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return 0;
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if (rxrpc_call_is_complete(call))
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return call->error;
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if (timeout == 0 &&
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tx_win == tx_start && signal_pending(current))
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return -EINTR;
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if (tx_win != tx_start) {
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timeout = rtt;
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tx_start = tx_win;
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}
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trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
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timeout = schedule_timeout(timeout);
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}
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}
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/*
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* Wait for space to appear in the Tx queue uninterruptibly.
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*/
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static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
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struct rxrpc_call *call,
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long *timeo)
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{
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for (;;) {
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set_current_state(TASK_UNINTERRUPTIBLE);
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if (rxrpc_check_tx_space(call, NULL))
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return 0;
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if (rxrpc_call_is_complete(call))
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return call->error;
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trace_rxrpc_txqueue(call, rxrpc_txqueue_wait);
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*timeo = schedule_timeout(*timeo);
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}
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}
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/*
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* wait for space to appear in the transmit/ACK window
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* - caller holds the socket locked
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*/
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static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
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struct rxrpc_call *call,
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long *timeo,
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bool waitall)
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{
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DECLARE_WAITQUEUE(myself, current);
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int ret;
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_enter(",{%u,%u,%u,%u}",
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call->tx_bottom, call->acks_hard_ack, call->tx_top, call->tx_winsize);
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add_wait_queue(&call->waitq, &myself);
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switch (call->interruptibility) {
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case RXRPC_INTERRUPTIBLE:
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if (waitall)
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ret = rxrpc_wait_for_tx_window_waitall(rx, call);
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else
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ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo);
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break;
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case RXRPC_PREINTERRUPTIBLE:
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case RXRPC_UNINTERRUPTIBLE:
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default:
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ret = rxrpc_wait_for_tx_window_nonintr(rx, call, timeo);
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break;
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}
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remove_wait_queue(&call->waitq, &myself);
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set_current_state(TASK_RUNNING);
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* Notify the owner of the call that the transmit phase is ended and the last
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* packet has been queued.
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*/
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static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
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rxrpc_notify_end_tx_t notify_end_tx)
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{
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if (notify_end_tx)
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notify_end_tx(&rx->sk, call, call->user_call_ID);
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}
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/*
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* Queue a DATA packet for transmission, set the resend timeout and send
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* the packet immediately. Returns the error from rxrpc_send_data_packet()
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* in case the caller wants to do something with it.
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*/
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static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
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struct rxrpc_txbuf *txb,
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rxrpc_notify_end_tx_t notify_end_tx)
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{
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rxrpc_seq_t seq = txb->seq;
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bool last = test_bit(RXRPC_TXBUF_LAST, &txb->flags), poke;
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rxrpc_inc_stat(call->rxnet, stat_tx_data);
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ASSERTCMP(txb->seq, ==, call->tx_prepared + 1);
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/* We have to set the timestamp before queueing as the retransmit
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* algorithm can see the packet as soon as we queue it.
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*/
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txb->last_sent = ktime_get_real();
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if (last)
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trace_rxrpc_txqueue(call, rxrpc_txqueue_queue_last);
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else
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trace_rxrpc_txqueue(call, rxrpc_txqueue_queue);
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/* Add the packet to the call's output buffer */
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spin_lock(&call->tx_lock);
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poke = list_empty(&call->tx_sendmsg);
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list_add_tail(&txb->call_link, &call->tx_sendmsg);
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call->tx_prepared = seq;
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if (last)
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rxrpc_notify_end_tx(rx, call, notify_end_tx);
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spin_unlock(&call->tx_lock);
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if (poke)
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rxrpc_poke_call(call, rxrpc_call_poke_start);
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}
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/*
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* send data through a socket
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* - must be called in process context
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* - The caller holds the call user access mutex, but not the socket lock.
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*/
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static int rxrpc_send_data(struct rxrpc_sock *rx,
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struct rxrpc_call *call,
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struct msghdr *msg, size_t len,
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rxrpc_notify_end_tx_t notify_end_tx,
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bool *_dropped_lock)
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{
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struct rxrpc_txbuf *txb;
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struct sock *sk = &rx->sk;
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enum rxrpc_call_state state;
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long timeo;
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bool more = msg->msg_flags & MSG_MORE;
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int ret, copied = 0;
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timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
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ret = rxrpc_wait_to_be_connected(call, &timeo);
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if (ret < 0)
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return ret;
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if (call->conn->state == RXRPC_CONN_CLIENT_UNSECURED) {
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ret = rxrpc_init_client_conn_security(call->conn);
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if (ret < 0)
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return ret;
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}
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/* this should be in poll */
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sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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reload:
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ret = -EPIPE;
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if (sk->sk_shutdown & SEND_SHUTDOWN)
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goto maybe_error;
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state = rxrpc_call_state(call);
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ret = -ESHUTDOWN;
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if (state >= RXRPC_CALL_COMPLETE)
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goto maybe_error;
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ret = -EPROTO;
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if (state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
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state != RXRPC_CALL_SERVER_ACK_REQUEST &&
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state != RXRPC_CALL_SERVER_SEND_REPLY) {
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/* Request phase complete for this client call */
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trace_rxrpc_abort(call->debug_id, rxrpc_sendmsg_late_send,
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call->cid, call->call_id, call->rx_consumed,
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0, -EPROTO);
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goto maybe_error;
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}
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ret = -EMSGSIZE;
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if (call->tx_total_len != -1) {
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if (len - copied > call->tx_total_len)
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goto maybe_error;
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if (!more && len - copied != call->tx_total_len)
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goto maybe_error;
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}
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txb = call->tx_pending;
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call->tx_pending = NULL;
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if (txb)
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rxrpc_see_txbuf(txb, rxrpc_txbuf_see_send_more);
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do {
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if (!txb) {
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size_t remain, bufsize, chunk, offset;
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_debug("alloc");
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if (!rxrpc_check_tx_space(call, NULL))
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goto wait_for_space;
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/* Work out the maximum size of a packet. Assume that
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* the security header is going to be in the padded
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* region (enc blocksize), but the trailer is not.
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*/
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remain = more ? INT_MAX : msg_data_left(msg);
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ret = call->conn->security->how_much_data(call, remain,
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&bufsize, &chunk, &offset);
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if (ret < 0)
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goto maybe_error;
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_debug("SIZE: %zu/%zu @%zu", chunk, bufsize, offset);
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/* create a buffer that we can retain until it's ACK'd */
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ret = -ENOMEM;
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txb = rxrpc_alloc_txbuf(call, RXRPC_PACKET_TYPE_DATA,
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GFP_KERNEL);
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if (!txb)
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goto maybe_error;
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txb->offset = offset;
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txb->space -= offset;
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txb->space = min_t(size_t, chunk, txb->space);
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}
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_debug("append");
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/* append next segment of data to the current buffer */
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if (msg_data_left(msg) > 0) {
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size_t copy = min_t(size_t, txb->space, msg_data_left(msg));
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_debug("add %zu", copy);
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if (!copy_from_iter_full(txb->data + txb->offset, copy,
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&msg->msg_iter))
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goto efault;
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_debug("added");
|
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txb->space -= copy;
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txb->len += copy;
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txb->offset += copy;
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copied += copy;
|
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if (call->tx_total_len != -1)
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call->tx_total_len -= copy;
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}
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|
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/* check for the far side aborting the call or a network error
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* occurring */
|
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if (rxrpc_call_is_complete(call))
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goto call_terminated;
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|
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/* add the packet to the send queue if it's now full */
|
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if (!txb->space ||
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(msg_data_left(msg) == 0 && !more)) {
|
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if (msg_data_left(msg) == 0 && !more) {
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txb->wire.flags |= RXRPC_LAST_PACKET;
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__set_bit(RXRPC_TXBUF_LAST, &txb->flags);
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}
|
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else if (call->tx_top - call->acks_hard_ack <
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call->tx_winsize)
|
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txb->wire.flags |= RXRPC_MORE_PACKETS;
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|
|
ret = call->security->secure_packet(call, txb);
|
|
if (ret < 0)
|
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goto out;
|
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|
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rxrpc_queue_packet(rx, call, txb, notify_end_tx);
|
|
txb = NULL;
|
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}
|
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} while (msg_data_left(msg) > 0);
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|
|
success:
|
|
ret = copied;
|
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if (rxrpc_call_is_complete(call) &&
|
|
call->error < 0)
|
|
ret = call->error;
|
|
out:
|
|
call->tx_pending = txb;
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
call_terminated:
|
|
rxrpc_put_txbuf(txb, rxrpc_txbuf_put_send_aborted);
|
|
_leave(" = %d", call->error);
|
|
return call->error;
|
|
|
|
maybe_error:
|
|
if (copied)
|
|
goto success;
|
|
goto out;
|
|
|
|
efault:
|
|
ret = -EFAULT;
|
|
goto out;
|
|
|
|
wait_for_space:
|
|
ret = -EAGAIN;
|
|
if (msg->msg_flags & MSG_DONTWAIT)
|
|
goto maybe_error;
|
|
mutex_unlock(&call->user_mutex);
|
|
*_dropped_lock = true;
|
|
ret = rxrpc_wait_for_tx_window(rx, call, &timeo,
|
|
msg->msg_flags & MSG_WAITALL);
|
|
if (ret < 0)
|
|
goto maybe_error;
|
|
if (call->interruptibility == RXRPC_INTERRUPTIBLE) {
|
|
if (mutex_lock_interruptible(&call->user_mutex) < 0) {
|
|
ret = sock_intr_errno(timeo);
|
|
goto maybe_error;
|
|
}
|
|
} else {
|
|
mutex_lock(&call->user_mutex);
|
|
}
|
|
*_dropped_lock = false;
|
|
goto reload;
|
|
}
|
|
|
|
/*
|
|
* extract control messages from the sendmsg() control buffer
|
|
*/
|
|
static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
|
|
{
|
|
struct cmsghdr *cmsg;
|
|
bool got_user_ID = false;
|
|
int len;
|
|
|
|
if (msg->msg_controllen == 0)
|
|
return -EINVAL;
|
|
|
|
for_each_cmsghdr(cmsg, msg) {
|
|
if (!CMSG_OK(msg, cmsg))
|
|
return -EINVAL;
|
|
|
|
len = cmsg->cmsg_len - sizeof(struct cmsghdr);
|
|
_debug("CMSG %d, %d, %d",
|
|
cmsg->cmsg_level, cmsg->cmsg_type, len);
|
|
|
|
if (cmsg->cmsg_level != SOL_RXRPC)
|
|
continue;
|
|
|
|
switch (cmsg->cmsg_type) {
|
|
case RXRPC_USER_CALL_ID:
|
|
if (msg->msg_flags & MSG_CMSG_COMPAT) {
|
|
if (len != sizeof(u32))
|
|
return -EINVAL;
|
|
p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
|
|
} else {
|
|
if (len != sizeof(unsigned long))
|
|
return -EINVAL;
|
|
p->call.user_call_ID = *(unsigned long *)
|
|
CMSG_DATA(cmsg);
|
|
}
|
|
got_user_ID = true;
|
|
break;
|
|
|
|
case RXRPC_ABORT:
|
|
if (p->command != RXRPC_CMD_SEND_DATA)
|
|
return -EINVAL;
|
|
p->command = RXRPC_CMD_SEND_ABORT;
|
|
if (len != sizeof(p->abort_code))
|
|
return -EINVAL;
|
|
p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
|
|
if (p->abort_code == 0)
|
|
return -EINVAL;
|
|
break;
|
|
|
|
case RXRPC_CHARGE_ACCEPT:
|
|
if (p->command != RXRPC_CMD_SEND_DATA)
|
|
return -EINVAL;
|
|
p->command = RXRPC_CMD_CHARGE_ACCEPT;
|
|
if (len != 0)
|
|
return -EINVAL;
|
|
break;
|
|
|
|
case RXRPC_EXCLUSIVE_CALL:
|
|
p->exclusive = true;
|
|
if (len != 0)
|
|
return -EINVAL;
|
|
break;
|
|
|
|
case RXRPC_UPGRADE_SERVICE:
|
|
p->upgrade = true;
|
|
if (len != 0)
|
|
return -EINVAL;
|
|
break;
|
|
|
|
case RXRPC_TX_LENGTH:
|
|
if (p->call.tx_total_len != -1 || len != sizeof(__s64))
|
|
return -EINVAL;
|
|
p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
|
|
if (p->call.tx_total_len < 0)
|
|
return -EINVAL;
|
|
break;
|
|
|
|
case RXRPC_SET_CALL_TIMEOUT:
|
|
if (len & 3 || len < 4 || len > 12)
|
|
return -EINVAL;
|
|
memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
|
|
p->call.nr_timeouts = len / 4;
|
|
if (p->call.timeouts.hard > INT_MAX / HZ)
|
|
return -ERANGE;
|
|
if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
|
|
return -ERANGE;
|
|
if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
|
|
return -ERANGE;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (!got_user_ID)
|
|
return -EINVAL;
|
|
if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
|
|
return -EINVAL;
|
|
_leave(" = 0");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create a new client call for sendmsg().
|
|
* - Called with the socket lock held, which it must release.
|
|
* - If it returns a call, the call's lock will need releasing by the caller.
|
|
*/
|
|
static struct rxrpc_call *
|
|
rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
|
|
struct rxrpc_send_params *p)
|
|
__releases(&rx->sk.sk_lock.slock)
|
|
__acquires(&call->user_mutex)
|
|
{
|
|
struct rxrpc_conn_parameters cp;
|
|
struct rxrpc_call *call;
|
|
struct key *key;
|
|
|
|
DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
|
|
|
|
_enter("");
|
|
|
|
if (!msg->msg_name) {
|
|
release_sock(&rx->sk);
|
|
return ERR_PTR(-EDESTADDRREQ);
|
|
}
|
|
|
|
key = rx->key;
|
|
if (key && !rx->key->payload.data[0])
|
|
key = NULL;
|
|
|
|
memset(&cp, 0, sizeof(cp));
|
|
cp.local = rx->local;
|
|
cp.key = rx->key;
|
|
cp.security_level = rx->min_sec_level;
|
|
cp.exclusive = rx->exclusive | p->exclusive;
|
|
cp.upgrade = p->upgrade;
|
|
cp.service_id = srx->srx_service;
|
|
call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL,
|
|
atomic_inc_return(&rxrpc_debug_id));
|
|
/* The socket is now unlocked */
|
|
|
|
_leave(" = %p\n", call);
|
|
return call;
|
|
}
|
|
|
|
/*
|
|
* send a message forming part of a client call through an RxRPC socket
|
|
* - caller holds the socket locked
|
|
* - the socket may be either a client socket or a server socket
|
|
*/
|
|
int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
|
|
__releases(&rx->sk.sk_lock.slock)
|
|
{
|
|
struct rxrpc_call *call;
|
|
unsigned long now, j;
|
|
bool dropped_lock = false;
|
|
int ret;
|
|
|
|
struct rxrpc_send_params p = {
|
|
.call.tx_total_len = -1,
|
|
.call.user_call_ID = 0,
|
|
.call.nr_timeouts = 0,
|
|
.call.interruptibility = RXRPC_INTERRUPTIBLE,
|
|
.abort_code = 0,
|
|
.command = RXRPC_CMD_SEND_DATA,
|
|
.exclusive = false,
|
|
.upgrade = false,
|
|
};
|
|
|
|
_enter("");
|
|
|
|
ret = rxrpc_sendmsg_cmsg(msg, &p);
|
|
if (ret < 0)
|
|
goto error_release_sock;
|
|
|
|
if (p.command == RXRPC_CMD_CHARGE_ACCEPT) {
|
|
ret = -EINVAL;
|
|
if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
|
|
goto error_release_sock;
|
|
ret = rxrpc_user_charge_accept(rx, p.call.user_call_ID);
|
|
goto error_release_sock;
|
|
}
|
|
|
|
call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
|
|
if (!call) {
|
|
ret = -EBADSLT;
|
|
if (p.command != RXRPC_CMD_SEND_DATA)
|
|
goto error_release_sock;
|
|
call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
|
|
/* The socket is now unlocked... */
|
|
if (IS_ERR(call))
|
|
return PTR_ERR(call);
|
|
/* ... and we have the call lock. */
|
|
p.call.nr_timeouts = 0;
|
|
ret = 0;
|
|
if (rxrpc_call_is_complete(call))
|
|
goto out_put_unlock;
|
|
} else {
|
|
switch (rxrpc_call_state(call)) {
|
|
case RXRPC_CALL_CLIENT_AWAIT_CONN:
|
|
case RXRPC_CALL_SERVER_SECURING:
|
|
if (p.command == RXRPC_CMD_SEND_ABORT)
|
|
break;
|
|
fallthrough;
|
|
case RXRPC_CALL_UNINITIALISED:
|
|
case RXRPC_CALL_SERVER_PREALLOC:
|
|
rxrpc_put_call(call, rxrpc_call_put_sendmsg);
|
|
ret = -EBUSY;
|
|
goto error_release_sock;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = mutex_lock_interruptible(&call->user_mutex);
|
|
release_sock(&rx->sk);
|
|
if (ret < 0) {
|
|
ret = -ERESTARTSYS;
|
|
goto error_put;
|
|
}
|
|
|
|
if (p.call.tx_total_len != -1) {
|
|
ret = -EINVAL;
|
|
if (call->tx_total_len != -1 ||
|
|
call->tx_pending ||
|
|
call->tx_top != 0)
|
|
goto out_put_unlock;
|
|
call->tx_total_len = p.call.tx_total_len;
|
|
}
|
|
}
|
|
|
|
switch (p.call.nr_timeouts) {
|
|
case 3:
|
|
j = msecs_to_jiffies(p.call.timeouts.normal);
|
|
if (p.call.timeouts.normal > 0 && j == 0)
|
|
j = 1;
|
|
WRITE_ONCE(call->next_rx_timo, j);
|
|
fallthrough;
|
|
case 2:
|
|
j = msecs_to_jiffies(p.call.timeouts.idle);
|
|
if (p.call.timeouts.idle > 0 && j == 0)
|
|
j = 1;
|
|
WRITE_ONCE(call->next_req_timo, j);
|
|
fallthrough;
|
|
case 1:
|
|
if (p.call.timeouts.hard > 0) {
|
|
j = p.call.timeouts.hard * HZ;
|
|
now = jiffies;
|
|
j += now;
|
|
WRITE_ONCE(call->expect_term_by, j);
|
|
rxrpc_reduce_call_timer(call, j, now,
|
|
rxrpc_timer_set_for_hard);
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (rxrpc_call_is_complete(call)) {
|
|
/* it's too late for this call */
|
|
ret = -ESHUTDOWN;
|
|
} else if (p.command == RXRPC_CMD_SEND_ABORT) {
|
|
rxrpc_propose_abort(call, p.abort_code, -ECONNABORTED,
|
|
rxrpc_abort_call_sendmsg);
|
|
ret = 0;
|
|
} else if (p.command != RXRPC_CMD_SEND_DATA) {
|
|
ret = -EINVAL;
|
|
} else {
|
|
ret = rxrpc_send_data(rx, call, msg, len, NULL, &dropped_lock);
|
|
}
|
|
|
|
out_put_unlock:
|
|
if (!dropped_lock)
|
|
mutex_unlock(&call->user_mutex);
|
|
error_put:
|
|
rxrpc_put_call(call, rxrpc_call_put_sendmsg);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
error_release_sock:
|
|
release_sock(&rx->sk);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* rxrpc_kernel_send_data - Allow a kernel service to send data on a call
|
|
* @sock: The socket the call is on
|
|
* @call: The call to send data through
|
|
* @msg: The data to send
|
|
* @len: The amount of data to send
|
|
* @notify_end_tx: Notification that the last packet is queued.
|
|
*
|
|
* Allow a kernel service to send data on a call. The call must be in an state
|
|
* appropriate to sending data. No control data should be supplied in @msg,
|
|
* nor should an address be supplied. MSG_MORE should be flagged if there's
|
|
* more data to come, otherwise this data will end the transmission phase.
|
|
*/
|
|
int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
|
|
struct msghdr *msg, size_t len,
|
|
rxrpc_notify_end_tx_t notify_end_tx)
|
|
{
|
|
bool dropped_lock = false;
|
|
int ret;
|
|
|
|
_enter("{%d},", call->debug_id);
|
|
|
|
ASSERTCMP(msg->msg_name, ==, NULL);
|
|
ASSERTCMP(msg->msg_control, ==, NULL);
|
|
|
|
mutex_lock(&call->user_mutex);
|
|
|
|
ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
|
|
notify_end_tx, &dropped_lock);
|
|
if (ret == -ESHUTDOWN)
|
|
ret = call->error;
|
|
|
|
if (!dropped_lock)
|
|
mutex_unlock(&call->user_mutex);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(rxrpc_kernel_send_data);
|
|
|
|
/**
|
|
* rxrpc_kernel_abort_call - Allow a kernel service to abort a call
|
|
* @sock: The socket the call is on
|
|
* @call: The call to be aborted
|
|
* @abort_code: The abort code to stick into the ABORT packet
|
|
* @error: Local error value
|
|
* @why: Indication as to why.
|
|
*
|
|
* Allow a kernel service to abort a call, if it's still in an abortable state
|
|
* and return true if the call was aborted, false if it was already complete.
|
|
*/
|
|
bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
|
|
u32 abort_code, int error, enum rxrpc_abort_reason why)
|
|
{
|
|
bool aborted;
|
|
|
|
_enter("{%d},%d,%d,%u", call->debug_id, abort_code, error, why);
|
|
|
|
mutex_lock(&call->user_mutex);
|
|
aborted = rxrpc_propose_abort(call, abort_code, error, why);
|
|
mutex_unlock(&call->user_mutex);
|
|
return aborted;
|
|
}
|
|
EXPORT_SYMBOL(rxrpc_kernel_abort_call);
|
|
|
|
/**
|
|
* rxrpc_kernel_set_tx_length - Set the total Tx length on a call
|
|
* @sock: The socket the call is on
|
|
* @call: The call to be informed
|
|
* @tx_total_len: The amount of data to be transmitted for this call
|
|
*
|
|
* Allow a kernel service to set the total transmit length on a call. This
|
|
* allows buffer-to-packet encrypt-and-copy to be performed.
|
|
*
|
|
* This function is primarily for use for setting the reply length since the
|
|
* request length can be set when beginning the call.
|
|
*/
|
|
void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
|
|
s64 tx_total_len)
|
|
{
|
|
WARN_ON(call->tx_total_len != -1);
|
|
call->tx_total_len = tx_total_len;
|
|
}
|
|
EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
|