7aa51da7c8
Expedite the transmission of a response to a PING ACK by sending it from sendmsg if one is pending. We're most likely to see a PING ACK during the client call Tx phase as the other side may use it to determine a number of parameters, such as the client's receive window size, the RTT and whether the client is doing slow start (similar to RFC5681). If we don't expedite it, it's left to the background processing thread to transmit. Signed-off-by: David Howells <dhowells@redhat.com>
593 lines
15 KiB
C
593 lines
15 KiB
C
/* 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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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 <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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enum rxrpc_command {
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RXRPC_CMD_SEND_DATA, /* send data message */
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RXRPC_CMD_SEND_ABORT, /* request abort generation */
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RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
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RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
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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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{
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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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for (;;) {
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set_current_state(TASK_INTERRUPTIBLE);
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ret = 0;
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if (call->tx_top - call->tx_hard_ack < call->tx_winsize)
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break;
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if (call->state >= RXRPC_CALL_COMPLETE) {
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ret = -call->error;
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break;
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}
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if (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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trace_rxrpc_transmit(call, rxrpc_transmit_wait);
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release_sock(&rx->sk);
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*timeo = schedule_timeout(*timeo);
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lock_sock(&rx->sk);
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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] = 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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* Queue a DATA packet for transmission, set the resend timeout and send the
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* packet immediately
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*/
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static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
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bool last)
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{
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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rxrpc_seq_t seq = sp->hdr.seq;
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int ret, ix;
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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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ix = seq & RXRPC_RXTX_BUFF_MASK;
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rxrpc_get_skb(skb, rxrpc_skb_tx_got);
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call->rxtx_annotations[ix] = RXRPC_TX_ANNO_UNACK;
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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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set_bit(RXRPC_CALL_TX_LAST, &call->flags);
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trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
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} else if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
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trace_rxrpc_transmit(call, rxrpc_transmit_queue_reqack);
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} else {
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trace_rxrpc_transmit(call, rxrpc_transmit_queue);
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}
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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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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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if (!last)
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break;
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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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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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sp->resend_at = jiffies + rxrpc_resend_timeout;
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ret = rxrpc_send_data_packet(call, skb);
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if (ret < 0) {
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_debug("need instant resend %d", ret);
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rxrpc_instant_resend(call, ix);
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}
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rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
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_leave("");
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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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* - caller holds the socket locked
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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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{
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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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skb = call->tx_pending;
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call->tx_pending = NULL;
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rxrpc_see_skb(skb, rxrpc_skb_tx_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_call_packet(call, RXRPC_PACKET_TYPE_ACK);
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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 (call->tx_top - call->tx_hard_ack >=
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call->tx_winsize) {
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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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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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rxrpc_new_skb(skb, rxrpc_skb_tx_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 = rxrpc_skb(skb);
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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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/* 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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_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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}
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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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/* 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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memset(skb_put(skb, pad), 0, pad);
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}
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seq = call->tx_top + 1;
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sp->hdr.seq = seq;
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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;
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else if (call->tx_top - call->tx_hard_ack <
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call->tx_winsize)
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sp->hdr.flags |= RXRPC_MORE_PACKETS;
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if (seq & 1)
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sp->hdr.flags |= RXRPC_REQUEST_ACK;
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ret = conn->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;
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rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more);
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skb = NULL;
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}
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} while (msg_data_left(msg) > 0);
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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);
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return ret;
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call_terminated:
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rxrpc_free_skb(skb, rxrpc_skb_tx_freed);
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_leave(" = %d", -call->error);
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return -call->error;
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maybe_error:
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if (copied)
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goto success;
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goto out;
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efault:
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ret = -EFAULT;
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goto out;
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}
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/*
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* extract control messages from the sendmsg() control buffer
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*/
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static int rxrpc_sendmsg_cmsg(struct msghdr *msg,
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unsigned long *user_call_ID,
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enum rxrpc_command *command,
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u32 *abort_code,
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bool *_exclusive)
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{
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struct cmsghdr *cmsg;
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bool got_user_ID = false;
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int len;
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*command = RXRPC_CMD_SEND_DATA;
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if (msg->msg_controllen == 0)
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return -EINVAL;
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for_each_cmsghdr(cmsg, msg) {
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if (!CMSG_OK(msg, cmsg))
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return -EINVAL;
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len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
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_debug("CMSG %d, %d, %d",
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cmsg->cmsg_level, cmsg->cmsg_type, len);
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if (cmsg->cmsg_level != SOL_RXRPC)
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continue;
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switch (cmsg->cmsg_type) {
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case RXRPC_USER_CALL_ID:
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if (msg->msg_flags & MSG_CMSG_COMPAT) {
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if (len != sizeof(u32))
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return -EINVAL;
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*user_call_ID = *(u32 *) CMSG_DATA(cmsg);
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} else {
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if (len != sizeof(unsigned long))
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return -EINVAL;
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*user_call_ID = *(unsigned long *)
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CMSG_DATA(cmsg);
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}
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_debug("User Call ID %lx", *user_call_ID);
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got_user_ID = true;
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break;
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case RXRPC_ABORT:
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if (*command != RXRPC_CMD_SEND_DATA)
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return -EINVAL;
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*command = RXRPC_CMD_SEND_ABORT;
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if (len != sizeof(*abort_code))
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return -EINVAL;
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*abort_code = *(unsigned int *) CMSG_DATA(cmsg);
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_debug("Abort %x", *abort_code);
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if (*abort_code == 0)
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return -EINVAL;
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break;
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case RXRPC_ACCEPT:
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if (*command != RXRPC_CMD_SEND_DATA)
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return -EINVAL;
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*command = RXRPC_CMD_ACCEPT;
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if (len != 0)
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return -EINVAL;
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break;
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case RXRPC_EXCLUSIVE_CALL:
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*_exclusive = true;
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if (len != 0)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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}
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if (!got_user_ID)
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return -EINVAL;
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_leave(" = 0");
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return 0;
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}
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/*
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* Create a new client call for sendmsg().
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*/
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static struct rxrpc_call *
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rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
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unsigned long user_call_ID, bool exclusive)
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{
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struct rxrpc_conn_parameters cp;
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struct rxrpc_call *call;
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struct key *key;
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DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
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_enter("");
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if (!msg->msg_name)
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return ERR_PTR(-EDESTADDRREQ);
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key = rx->key;
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if (key && !rx->key->payload.data[0])
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key = NULL;
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memset(&cp, 0, sizeof(cp));
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cp.local = rx->local;
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cp.key = rx->key;
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cp.security_level = rx->min_sec_level;
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cp.exclusive = rx->exclusive | exclusive;
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cp.service_id = srx->srx_service;
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call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL);
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_leave(" = %p\n", call);
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return call;
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}
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/*
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* send a message forming part of a client call through an RxRPC socket
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* - caller holds the socket locked
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* - the socket may be either a client socket or a server socket
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*/
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int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
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{
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enum rxrpc_command cmd;
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struct rxrpc_call *call;
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unsigned long user_call_ID = 0;
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bool exclusive = false;
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u32 abort_code = 0;
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int ret;
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_enter("");
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ret = rxrpc_sendmsg_cmsg(msg, &user_call_ID, &cmd, &abort_code,
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&exclusive);
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if (ret < 0)
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return ret;
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if (cmd == RXRPC_CMD_ACCEPT) {
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if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
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return -EINVAL;
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call = rxrpc_accept_call(rx, user_call_ID, NULL);
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if (IS_ERR(call))
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return PTR_ERR(call);
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rxrpc_put_call(call, rxrpc_call_put);
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return 0;
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}
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call = rxrpc_find_call_by_user_ID(rx, user_call_ID);
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if (!call) {
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if (cmd != RXRPC_CMD_SEND_DATA)
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return -EBADSLT;
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call = rxrpc_new_client_call_for_sendmsg(rx, msg, user_call_ID,
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exclusive);
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if (IS_ERR(call))
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return PTR_ERR(call);
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}
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_debug("CALL %d USR %lx ST %d on CONN %p",
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call->debug_id, call->user_call_ID, call->state, call->conn);
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if (call->state >= RXRPC_CALL_COMPLETE) {
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/* it's too late for this call */
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ret = -ESHUTDOWN;
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} else if (cmd == RXRPC_CMD_SEND_ABORT) {
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ret = 0;
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if (rxrpc_abort_call("CMD", call, 0, abort_code, ECONNABORTED))
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ret = rxrpc_send_call_packet(call,
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RXRPC_PACKET_TYPE_ABORT);
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} else if (cmd != RXRPC_CMD_SEND_DATA) {
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ret = -EINVAL;
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} else if (rxrpc_is_client_call(call) &&
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call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
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/* request phase complete for this client call */
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ret = -EPROTO;
|
|
} else if (rxrpc_is_service_call(call) &&
|
|
call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
|
|
call->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);
|
|
}
|
|
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
_leave(" = %d", ret);
|
|
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
|
|
*
|
|
* 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)
|
|
{
|
|
int ret;
|
|
|
|
_enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
|
|
|
|
ASSERTCMP(msg->msg_name, ==, NULL);
|
|
ASSERTCMP(msg->msg_control, ==, NULL);
|
|
|
|
lock_sock(sock->sk);
|
|
|
|
_debug("CALL %d USR %lx ST %d on CONN %p",
|
|
call->debug_id, call->user_call_ID, call->state, call->conn);
|
|
|
|
if (call->state >= RXRPC_CALL_COMPLETE) {
|
|
ret = -ESHUTDOWN; /* it's too late for this call */
|
|
} else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
|
|
call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
|
|
call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
|
|
ret = -EPROTO; /* request phase complete for this client call */
|
|
} else {
|
|
ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len);
|
|
}
|
|
|
|
release_sock(sock->sk);
|
|
_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.
|
|
*/
|
|
void rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
|
|
u32 abort_code, int error, const char *why)
|
|
{
|
|
_enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
|
|
|
|
lock_sock(sock->sk);
|
|
|
|
if (rxrpc_abort_call(why, call, 0, abort_code, error))
|
|
rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT);
|
|
|
|
release_sock(sock->sk);
|
|
_leave("");
|
|
}
|
|
|
|
EXPORT_SYMBOL(rxrpc_kernel_abort_call);
|