![David Howells](/assets/img/avatar_default.png)
Fix the handling of sendmsg() with MSG_WAITALL for userspace to round the
timeout for when a signal occurs up to at least two jiffies as a 1 jiffy
timeout may end up being effectively 0 if jiffies wraps at the wrong time.
Fixes: bc5e3a546d
("rxrpc: Use MSG_WAITALL to tell sendmsg() to temporarily ignore signals")
Signed-off-by: David Howells <dhowells@redhat.com>
890 lines
22 KiB
C
890 lines
22 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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* 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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unsigned int win_size =
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min_t(unsigned int, call->tx_winsize,
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call->cong_cwnd + call->cong_extra);
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rxrpc_seq_t tx_win = READ_ONCE(call->tx_hard_ack);
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if (_tx_win)
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*_tx_win = tx_win;
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return call->tx_top - tx_win < win_size;
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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 (call->state >= RXRPC_CALL_COMPLETE)
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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_transmit(call, rxrpc_transmit_wait);
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mutex_unlock(&call->user_mutex);
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*timeo = schedule_timeout(*timeo);
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if (mutex_lock_interruptible(&call->user_mutex) < 0)
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return sock_intr_errno(*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 rtt2, timeout;
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u64 rtt;
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rtt = READ_ONCE(call->peer->rtt);
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rtt2 = nsecs_to_jiffies64(rtt) * 2;
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if (rtt2 < 2)
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rtt2 = 2;
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timeout = rtt2;
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tx_start = READ_ONCE(call->tx_hard_ack);
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for (;;) {
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set_current_state(TASK_UNINTERRUPTIBLE);
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tx_win = READ_ONCE(call->tx_hard_ack);
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if (rxrpc_check_tx_space(call, &tx_win))
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return 0;
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if (call->state >= RXRPC_CALL_COMPLETE)
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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 = rtt2;
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tx_start = tx_win;
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}
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trace_rxrpc_transmit(call, rxrpc_transmit_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 (call->state >= RXRPC_CALL_COMPLETE)
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return call->error;
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trace_rxrpc_transmit(call, rxrpc_transmit_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}",
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call->tx_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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* Schedule an instant Tx resend.
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*/
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static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
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{
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spin_lock_bh(&call->lock);
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if (call->state < RXRPC_CALL_COMPLETE) {
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call->rxtx_annotations[ix] =
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(call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) |
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RXRPC_TX_ANNO_RETRANS;
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if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
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rxrpc_queue_call(call);
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}
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spin_unlock_bh(&call->lock);
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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 int rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
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struct sk_buff *skb, bool last,
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rxrpc_notify_end_tx_t notify_end_tx)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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unsigned long now;
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rxrpc_seq_t seq = sp->hdr.seq;
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int ret, ix;
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u8 annotation = RXRPC_TX_ANNO_UNACK;
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_net("queue skb %p [%d]", skb, seq);
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ASSERTCMP(seq, ==, call->tx_top + 1);
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if (last)
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annotation |= RXRPC_TX_ANNO_LAST;
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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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skb->tstamp = ktime_get_real();
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ix = seq & RXRPC_RXTX_BUFF_MASK;
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rxrpc_get_skb(skb, rxrpc_skb_got);
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call->rxtx_annotations[ix] = annotation;
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smp_wmb();
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call->rxtx_buffer[ix] = skb;
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call->tx_top = seq;
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if (last)
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trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
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else
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trace_rxrpc_transmit(call, rxrpc_transmit_queue);
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if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
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_debug("________awaiting reply/ACK__________");
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write_lock_bh(&call->state_lock);
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switch (call->state) {
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case RXRPC_CALL_CLIENT_SEND_REQUEST:
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call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
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rxrpc_notify_end_tx(rx, call, notify_end_tx);
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break;
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case RXRPC_CALL_SERVER_ACK_REQUEST:
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call->state = RXRPC_CALL_SERVER_SEND_REPLY;
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now = jiffies;
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WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET);
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if (call->ackr_reason == RXRPC_ACK_DELAY)
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call->ackr_reason = 0;
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trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
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if (!last)
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break;
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/* Fall through */
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case RXRPC_CALL_SERVER_SEND_REPLY:
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call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
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rxrpc_notify_end_tx(rx, call, notify_end_tx);
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break;
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default:
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break;
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}
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write_unlock_bh(&call->state_lock);
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}
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if (seq == 1 && rxrpc_is_client_call(call))
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rxrpc_expose_client_call(call);
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ret = rxrpc_send_data_packet(call, skb, false);
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if (ret < 0) {
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switch (ret) {
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case -ENETUNREACH:
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case -EHOSTUNREACH:
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case -ECONNREFUSED:
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rxrpc_set_call_completion(call,
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RXRPC_CALL_LOCAL_ERROR,
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0, ret);
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rxrpc_notify_socket(call);
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goto out;
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}
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_debug("need instant resend %d", ret);
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rxrpc_instant_resend(call, ix);
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} else {
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unsigned long now = jiffies, resend_at;
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if (call->peer->rtt_usage > 1)
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resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2);
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else
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resend_at = rxrpc_resend_timeout;
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if (resend_at < 1)
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resend_at = 1;
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resend_at += now;
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WRITE_ONCE(call->resend_at, resend_at);
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rxrpc_reduce_call_timer(call, resend_at, now,
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rxrpc_timer_set_for_send);
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}
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out:
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rxrpc_free_skb(skb, rxrpc_skb_freed);
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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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* 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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{
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struct rxrpc_skb_priv *sp;
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struct sk_buff *skb;
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struct sock *sk = &rx->sk;
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long timeo;
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bool more;
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int ret, copied;
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timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
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/* this should be in poll */
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sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
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return -EPIPE;
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more = msg->msg_flags & MSG_MORE;
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if (call->tx_total_len != -1) {
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if (len > call->tx_total_len)
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return -EMSGSIZE;
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if (!more && len != call->tx_total_len)
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return -EMSGSIZE;
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}
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skb = call->tx_pending;
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call->tx_pending = NULL;
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rxrpc_see_skb(skb, rxrpc_skb_seen);
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copied = 0;
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do {
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/* Check to see if there's a ping ACK to reply to. */
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if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
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rxrpc_send_ack_packet(call, false, NULL);
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if (!skb) {
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size_t size, chunk, max, space;
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_debug("alloc");
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if (!rxrpc_check_tx_space(call, NULL)) {
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ret = -EAGAIN;
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if (msg->msg_flags & MSG_DONTWAIT)
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goto maybe_error;
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ret = rxrpc_wait_for_tx_window(rx, call,
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&timeo,
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msg->msg_flags & MSG_WAITALL);
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if (ret < 0)
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goto maybe_error;
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}
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max = RXRPC_JUMBO_DATALEN;
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max -= call->conn->security_size;
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max &= ~(call->conn->size_align - 1UL);
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chunk = max;
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if (chunk > msg_data_left(msg) && !more)
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chunk = msg_data_left(msg);
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space = chunk + call->conn->size_align;
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space &= ~(call->conn->size_align - 1UL);
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size = space + call->conn->security_size;
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_debug("SIZE: %zu/%zu/%zu", chunk, space, size);
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/* create a buffer that we can retain until it's ACK'd */
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skb = sock_alloc_send_skb(
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sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
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if (!skb)
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goto maybe_error;
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sp = rxrpc_skb(skb);
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sp->rx_flags |= RXRPC_SKB_TX_BUFFER;
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rxrpc_new_skb(skb, rxrpc_skb_new);
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_debug("ALLOC SEND %p", skb);
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ASSERTCMP(skb->mark, ==, 0);
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_debug("HS: %u", call->conn->security_size);
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skb_reserve(skb, call->conn->security_size);
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skb->len += call->conn->security_size;
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sp->remain = chunk;
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if (sp->remain > skb_tailroom(skb))
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sp->remain = skb_tailroom(skb);
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_net("skb: hr %d, tr %d, hl %d, rm %d",
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skb_headroom(skb),
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skb_tailroom(skb),
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skb_headlen(skb),
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sp->remain);
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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}
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_debug("append");
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sp = rxrpc_skb(skb);
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|
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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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int copy = skb_tailroom(skb);
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ASSERTCMP(copy, >, 0);
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if (copy > msg_data_left(msg))
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copy = msg_data_left(msg);
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if (copy > sp->remain)
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copy = sp->remain;
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|
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_debug("add");
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ret = skb_add_data(skb, &msg->msg_iter, copy);
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_debug("added");
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if (ret < 0)
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goto efault;
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sp->remain -= copy;
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skb->mark += 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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/* check for the far side aborting the call or a network error
|
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* occurring */
|
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if (call->state == RXRPC_CALL_COMPLETE)
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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 (sp->remain <= 0 ||
|
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(msg_data_left(msg) == 0 && !more)) {
|
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struct rxrpc_connection *conn = call->conn;
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uint32_t seq;
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size_t pad;
|
|
|
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/* pad out if we're using security */
|
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if (conn->security_ix) {
|
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pad = conn->security_size + skb->mark;
|
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pad = conn->size_align - pad;
|
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pad &= conn->size_align - 1;
|
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_debug("pad %zu", pad);
|
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if (pad)
|
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skb_put_zero(skb, pad);
|
|
}
|
|
|
|
seq = call->tx_top + 1;
|
|
|
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sp->hdr.seq = seq;
|
|
sp->hdr._rsvd = 0;
|
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sp->hdr.flags = conn->out_clientflag;
|
|
|
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if (msg_data_left(msg) == 0 && !more)
|
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sp->hdr.flags |= RXRPC_LAST_PACKET;
|
|
else if (call->tx_top - call->tx_hard_ack <
|
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call->tx_winsize)
|
|
sp->hdr.flags |= RXRPC_MORE_PACKETS;
|
|
|
|
ret = call->security->secure_packet(
|
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call, skb, skb->mark, skb->head);
|
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if (ret < 0)
|
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goto out;
|
|
|
|
ret = rxrpc_queue_packet(rx, call, skb,
|
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!msg_data_left(msg) && !more,
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|
notify_end_tx);
|
|
/* Should check for failure here */
|
|
skb = NULL;
|
|
}
|
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} while (msg_data_left(msg) > 0);
|
|
|
|
success:
|
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ret = copied;
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out:
|
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call->tx_pending = skb;
|
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_leave(" = %d", ret);
|
|
return ret;
|
|
|
|
call_terminated:
|
|
rxrpc_free_skb(skb, rxrpc_skb_freed);
|
|
_leave(" = %d", call->error);
|
|
return call->error;
|
|
|
|
maybe_error:
|
|
if (copied)
|
|
goto success;
|
|
goto out;
|
|
|
|
efault:
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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_ACCEPT:
|
|
if (p->command != RXRPC_CMD_SEND_DATA)
|
|
return -EINVAL;
|
|
p->command = RXRPC_CMD_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 */
|
|
|
|
rxrpc_put_peer(cp.peer);
|
|
_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)
|
|
__releases(&call->user_mutex)
|
|
{
|
|
enum rxrpc_call_state state;
|
|
struct rxrpc_call *call;
|
|
unsigned long now, j;
|
|
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_ACCEPT) {
|
|
ret = -EINVAL;
|
|
if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
|
|
goto error_release_sock;
|
|
call = rxrpc_accept_call(rx, p.call.user_call_ID, NULL);
|
|
/* The socket is now unlocked. */
|
|
if (IS_ERR(call))
|
|
return PTR_ERR(call);
|
|
ret = 0;
|
|
goto out_put_unlock;
|
|
}
|
|
|
|
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. */
|
|
} else {
|
|
switch (READ_ONCE(call->state)) {
|
|
case RXRPC_CALL_UNINITIALISED:
|
|
case RXRPC_CALL_CLIENT_AWAIT_CONN:
|
|
case RXRPC_CALL_SERVER_PREALLOC:
|
|
case RXRPC_CALL_SERVER_SECURING:
|
|
case RXRPC_CALL_SERVER_ACCEPTING:
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
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 error_put;
|
|
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);
|
|
/* Fall through */
|
|
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);
|
|
/* Fall through */
|
|
case 1:
|
|
if (p.call.timeouts.hard > 0) {
|
|
j = msecs_to_jiffies(p.call.timeouts.hard);
|
|
now = jiffies;
|
|
j += now;
|
|
WRITE_ONCE(call->expect_term_by, j);
|
|
rxrpc_reduce_call_timer(call, j, now,
|
|
rxrpc_timer_set_for_hard);
|
|
}
|
|
break;
|
|
}
|
|
|
|
state = READ_ONCE(call->state);
|
|
_debug("CALL %d USR %lx ST %d on CONN %p",
|
|
call->debug_id, call->user_call_ID, state, call->conn);
|
|
|
|
if (state >= RXRPC_CALL_COMPLETE) {
|
|
/* it's too late for this call */
|
|
ret = -ESHUTDOWN;
|
|
} else if (p.command == RXRPC_CMD_SEND_ABORT) {
|
|
ret = 0;
|
|
if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
|
|
ret = rxrpc_send_abort_packet(call);
|
|
} else if (p.command != RXRPC_CMD_SEND_DATA) {
|
|
ret = -EINVAL;
|
|
} else if (rxrpc_is_client_call(call) &&
|
|
state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
|
|
/* request phase complete for this client call */
|
|
ret = -EPROTO;
|
|
} else if (rxrpc_is_service_call(call) &&
|
|
state != RXRPC_CALL_SERVER_ACK_REQUEST &&
|
|
state != RXRPC_CALL_SERVER_SEND_REPLY) {
|
|
/* Reply phase not begun or not complete for service call. */
|
|
ret = -EPROTO;
|
|
} else {
|
|
ret = rxrpc_send_data(rx, call, msg, len, NULL);
|
|
}
|
|
|
|
out_put_unlock:
|
|
mutex_unlock(&call->user_mutex);
|
|
error_put:
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
_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)
|
|
{
|
|
int ret;
|
|
|
|
_enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
|
|
|
|
ASSERTCMP(msg->msg_name, ==, NULL);
|
|
ASSERTCMP(msg->msg_control, ==, NULL);
|
|
|
|
mutex_lock(&call->user_mutex);
|
|
|
|
_debug("CALL %d USR %lx ST %d on CONN %p",
|
|
call->debug_id, call->user_call_ID, call->state, call->conn);
|
|
|
|
switch (READ_ONCE(call->state)) {
|
|
case RXRPC_CALL_CLIENT_SEND_REQUEST:
|
|
case RXRPC_CALL_SERVER_ACK_REQUEST:
|
|
case RXRPC_CALL_SERVER_SEND_REPLY:
|
|
ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
|
|
notify_end_tx);
|
|
break;
|
|
case RXRPC_CALL_COMPLETE:
|
|
read_lock_bh(&call->state_lock);
|
|
ret = call->error;
|
|
read_unlock_bh(&call->state_lock);
|
|
break;
|
|
default:
|
|
/* Request phase complete for this client call */
|
|
trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
|
|
ret = -EPROTO;
|
|
break;
|
|
}
|
|
|
|
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: 3-char string indicating 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, const char *why)
|
|
{
|
|
bool aborted;
|
|
|
|
_enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
|
|
|
|
mutex_lock(&call->user_mutex);
|
|
|
|
aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
|
|
if (aborted)
|
|
rxrpc_send_abort_packet(call);
|
|
|
|
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);
|