736 lines
20 KiB
C
736 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* RxRPC packet transmission
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/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 <net/udp.h>
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#include "ar-internal.h"
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extern int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
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static ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len)
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{
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struct sockaddr *sa = msg->msg_name;
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struct sock *sk = socket->sk;
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if (IS_ENABLED(CONFIG_AF_RXRPC_IPV6)) {
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if (sa->sa_family == AF_INET6) {
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if (sk->sk_family != AF_INET6) {
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pr_warn("AF_INET6 address on AF_INET socket\n");
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return -ENOPROTOOPT;
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}
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return udpv6_sendmsg(sk, msg, len);
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}
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}
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return udp_sendmsg(sk, msg, len);
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}
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struct rxrpc_abort_buffer {
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struct rxrpc_wire_header whdr;
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__be32 abort_code;
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};
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static const char rxrpc_keepalive_string[] = "";
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/*
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* Increase Tx backoff on transmission failure and clear it on success.
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*/
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static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret)
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{
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if (ret < 0) {
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u16 tx_backoff = READ_ONCE(call->tx_backoff);
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if (tx_backoff < HZ)
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WRITE_ONCE(call->tx_backoff, tx_backoff + 1);
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} else {
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WRITE_ONCE(call->tx_backoff, 0);
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}
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}
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/*
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* Arrange for a keepalive ping a certain time after we last transmitted. This
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* lets the far side know we're still interested in this call and helps keep
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* the route through any intervening firewall open.
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*
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* Receiving a response to the ping will prevent the ->expect_rx_by timer from
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* expiring.
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*/
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static void rxrpc_set_keepalive(struct rxrpc_call *call)
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{
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unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6;
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keepalive_at += now;
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WRITE_ONCE(call->keepalive_at, keepalive_at);
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rxrpc_reduce_call_timer(call, keepalive_at, now,
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rxrpc_timer_set_for_keepalive);
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}
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/*
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* Fill out an ACK packet.
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*/
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static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
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struct rxrpc_call *call,
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struct rxrpc_txbuf *txb,
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u16 *_rwind)
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{
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struct rxrpc_ackinfo ackinfo;
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unsigned int qsize, sack, wrap, to;
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rxrpc_seq_t window, wtop;
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int rsize;
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u32 mtu, jmax;
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u8 *ackp = txb->acks;
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call->ackr_nr_unacked = 0;
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atomic_set(&call->ackr_nr_consumed, 0);
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rxrpc_inc_stat(call->rxnet, stat_tx_ack_fill);
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clear_bit(RXRPC_CALL_RX_IS_IDLE, &call->flags);
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window = call->ackr_window;
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wtop = call->ackr_wtop;
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sack = call->ackr_sack_base % RXRPC_SACK_SIZE;
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txb->ack.firstPacket = htonl(window);
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txb->ack.nAcks = wtop - window;
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if (after(wtop, window)) {
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wrap = RXRPC_SACK_SIZE - sack;
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to = min_t(unsigned int, txb->ack.nAcks, RXRPC_SACK_SIZE);
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if (sack + txb->ack.nAcks <= RXRPC_SACK_SIZE) {
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memcpy(txb->acks, call->ackr_sack_table + sack, txb->ack.nAcks);
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} else {
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memcpy(txb->acks, call->ackr_sack_table + sack, wrap);
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memcpy(txb->acks + wrap, call->ackr_sack_table,
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to - wrap);
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}
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ackp += to;
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} else if (before(wtop, window)) {
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pr_warn("ack window backward %x %x", window, wtop);
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} else if (txb->ack.reason == RXRPC_ACK_DELAY) {
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txb->ack.reason = RXRPC_ACK_IDLE;
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}
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mtu = conn->peer->if_mtu;
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mtu -= conn->peer->hdrsize;
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jmax = rxrpc_rx_jumbo_max;
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qsize = (window - 1) - call->rx_consumed;
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rsize = max_t(int, call->rx_winsize - qsize, 0);
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*_rwind = rsize;
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ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
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ackinfo.maxMTU = htonl(mtu);
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ackinfo.rwind = htonl(rsize);
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ackinfo.jumbo_max = htonl(jmax);
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*ackp++ = 0;
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*ackp++ = 0;
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*ackp++ = 0;
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memcpy(ackp, &ackinfo, sizeof(ackinfo));
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return txb->ack.nAcks + 3 + sizeof(ackinfo);
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}
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/*
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* Record the beginning of an RTT probe.
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*/
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static int rxrpc_begin_rtt_probe(struct rxrpc_call *call, rxrpc_serial_t serial,
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enum rxrpc_rtt_tx_trace why)
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{
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unsigned long avail = call->rtt_avail;
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int rtt_slot = 9;
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if (!(avail & RXRPC_CALL_RTT_AVAIL_MASK))
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goto no_slot;
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rtt_slot = __ffs(avail & RXRPC_CALL_RTT_AVAIL_MASK);
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if (!test_and_clear_bit(rtt_slot, &call->rtt_avail))
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goto no_slot;
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call->rtt_serial[rtt_slot] = serial;
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call->rtt_sent_at[rtt_slot] = ktime_get_real();
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smp_wmb(); /* Write data before avail bit */
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set_bit(rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail);
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trace_rxrpc_rtt_tx(call, why, rtt_slot, serial);
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return rtt_slot;
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no_slot:
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trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_no_slot, rtt_slot, serial);
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return -1;
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}
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/*
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* Cancel an RTT probe.
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*/
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static void rxrpc_cancel_rtt_probe(struct rxrpc_call *call,
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rxrpc_serial_t serial, int rtt_slot)
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{
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if (rtt_slot != -1) {
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clear_bit(rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail);
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smp_wmb(); /* Clear pending bit before setting slot */
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set_bit(rtt_slot, &call->rtt_avail);
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trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_cancel, rtt_slot, serial);
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}
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}
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/*
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* Transmit an ACK packet.
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*/
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int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb)
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{
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struct rxrpc_connection *conn;
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struct msghdr msg;
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struct kvec iov[1];
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rxrpc_serial_t serial;
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size_t len, n;
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int ret, rtt_slot = -1;
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u16 rwind;
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if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
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return -ECONNRESET;
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conn = call->conn;
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msg.msg_name = &call->peer->srx.transport;
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msg.msg_namelen = call->peer->srx.transport_len;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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if (txb->ack.reason == RXRPC_ACK_PING)
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txb->wire.flags |= RXRPC_REQUEST_ACK;
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n = rxrpc_fill_out_ack(conn, call, txb, &rwind);
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if (n == 0)
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return 0;
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iov[0].iov_base = &txb->wire;
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iov[0].iov_len = sizeof(txb->wire) + sizeof(txb->ack) + n;
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len = iov[0].iov_len;
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serial = atomic_inc_return(&conn->serial);
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txb->wire.serial = htonl(serial);
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trace_rxrpc_tx_ack(call->debug_id, serial,
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ntohl(txb->ack.firstPacket),
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ntohl(txb->ack.serial), txb->ack.reason, txb->ack.nAcks,
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rwind);
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if (txb->ack.reason == RXRPC_ACK_PING)
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rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_ping);
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rxrpc_inc_stat(call->rxnet, stat_tx_ack_send);
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/* Grab the highest received seq as late as possible */
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txb->ack.previousPacket = htonl(call->rx_highest_seq);
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iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, len);
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ret = do_udp_sendmsg(conn->local->socket, &msg, len);
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call->peer->last_tx_at = ktime_get_seconds();
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if (ret < 0) {
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trace_rxrpc_tx_fail(call->debug_id, serial, ret,
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rxrpc_tx_point_call_ack);
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} else {
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trace_rxrpc_tx_packet(call->debug_id, &txb->wire,
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rxrpc_tx_point_call_ack);
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if (txb->wire.flags & RXRPC_REQUEST_ACK)
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call->peer->rtt_last_req = ktime_get_real();
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}
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rxrpc_tx_backoff(call, ret);
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if (!__rxrpc_call_is_complete(call)) {
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if (ret < 0)
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rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
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rxrpc_set_keepalive(call);
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}
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return ret;
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}
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/*
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* Send an ABORT call packet.
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*/
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int rxrpc_send_abort_packet(struct rxrpc_call *call)
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{
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struct rxrpc_connection *conn;
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struct rxrpc_abort_buffer pkt;
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struct msghdr msg;
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struct kvec iov[1];
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rxrpc_serial_t serial;
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int ret;
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/* Don't bother sending aborts for a client call once the server has
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* hard-ACK'd all of its request data. After that point, we're not
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* going to stop the operation proceeding, and whilst we might limit
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* the reply, it's not worth it if we can send a new call on the same
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* channel instead, thereby closing off this call.
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*/
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if (rxrpc_is_client_call(call) &&
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test_bit(RXRPC_CALL_TX_ALL_ACKED, &call->flags))
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return 0;
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if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
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return -ECONNRESET;
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conn = call->conn;
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msg.msg_name = &call->peer->srx.transport;
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msg.msg_namelen = call->peer->srx.transport_len;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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pkt.whdr.epoch = htonl(conn->proto.epoch);
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pkt.whdr.cid = htonl(call->cid);
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pkt.whdr.callNumber = htonl(call->call_id);
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pkt.whdr.seq = 0;
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pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT;
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pkt.whdr.flags = conn->out_clientflag;
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pkt.whdr.userStatus = 0;
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pkt.whdr.securityIndex = call->security_ix;
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pkt.whdr._rsvd = 0;
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pkt.whdr.serviceId = htons(call->dest_srx.srx_service);
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pkt.abort_code = htonl(call->abort_code);
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iov[0].iov_base = &pkt;
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iov[0].iov_len = sizeof(pkt);
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serial = atomic_inc_return(&conn->serial);
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pkt.whdr.serial = htonl(serial);
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iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, sizeof(pkt));
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ret = do_udp_sendmsg(conn->local->socket, &msg, sizeof(pkt));
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conn->peer->last_tx_at = ktime_get_seconds();
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if (ret < 0)
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trace_rxrpc_tx_fail(call->debug_id, serial, ret,
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rxrpc_tx_point_call_abort);
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else
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trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr,
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rxrpc_tx_point_call_abort);
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rxrpc_tx_backoff(call, ret);
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return ret;
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}
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/*
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* send a packet through the transport endpoint
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*/
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int rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb)
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{
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enum rxrpc_req_ack_trace why;
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struct rxrpc_connection *conn = call->conn;
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struct msghdr msg;
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struct kvec iov[1];
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rxrpc_serial_t serial;
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size_t len;
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int ret, rtt_slot = -1;
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_enter("%x,{%d}", txb->seq, txb->len);
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/* Each transmission of a Tx packet needs a new serial number */
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serial = atomic_inc_return(&conn->serial);
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txb->wire.serial = htonl(serial);
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if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) &&
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txb->seq == 1)
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txb->wire.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE;
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iov[0].iov_base = &txb->wire;
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iov[0].iov_len = sizeof(txb->wire) + txb->len;
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len = iov[0].iov_len;
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iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, len);
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msg.msg_name = &call->peer->srx.transport;
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msg.msg_namelen = call->peer->srx.transport_len;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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/* If our RTT cache needs working on, request an ACK. Also request
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* ACKs if a DATA packet appears to have been lost.
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*
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* However, we mustn't request an ACK on the last reply packet of a
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* service call, lest OpenAFS incorrectly send us an ACK with some
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* soft-ACKs in it and then never follow up with a proper hard ACK.
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*/
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if (txb->wire.flags & RXRPC_REQUEST_ACK)
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why = rxrpc_reqack_already_on;
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else if (test_bit(RXRPC_TXBUF_LAST, &txb->flags) && rxrpc_sending_to_client(txb))
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why = rxrpc_reqack_no_srv_last;
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else if (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events))
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why = rxrpc_reqack_ack_lost;
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else if (test_bit(RXRPC_TXBUF_RESENT, &txb->flags))
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why = rxrpc_reqack_retrans;
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else if (call->cong_mode == RXRPC_CALL_SLOW_START && call->cong_cwnd <= 2)
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why = rxrpc_reqack_slow_start;
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else if (call->tx_winsize <= 2)
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why = rxrpc_reqack_small_txwin;
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else if (call->peer->rtt_count < 3 && txb->seq & 1)
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why = rxrpc_reqack_more_rtt;
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else if (ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), ktime_get_real()))
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why = rxrpc_reqack_old_rtt;
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else
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goto dont_set_request_ack;
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rxrpc_inc_stat(call->rxnet, stat_why_req_ack[why]);
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trace_rxrpc_req_ack(call->debug_id, txb->seq, why);
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if (why != rxrpc_reqack_no_srv_last)
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txb->wire.flags |= RXRPC_REQUEST_ACK;
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dont_set_request_ack:
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if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
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static int lose;
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if ((lose++ & 7) == 7) {
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ret = 0;
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trace_rxrpc_tx_data(call, txb->seq, serial,
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txb->wire.flags,
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test_bit(RXRPC_TXBUF_RESENT, &txb->flags),
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true);
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goto done;
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}
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}
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trace_rxrpc_tx_data(call, txb->seq, serial, txb->wire.flags,
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test_bit(RXRPC_TXBUF_RESENT, &txb->flags), false);
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/* Track what we've attempted to transmit at least once so that the
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* retransmission algorithm doesn't try to resend what we haven't sent
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* yet. However, this can race as we can receive an ACK before we get
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* to this point. But, OTOH, if we won't get an ACK mentioning this
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* packet unless the far side received it (though it could have
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* discarded it anyway and NAK'd it).
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*/
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cmpxchg(&call->tx_transmitted, txb->seq - 1, txb->seq);
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|
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/* send the packet with the don't fragment bit set if we currently
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* think it's small enough */
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if (txb->len >= call->peer->maxdata)
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goto send_fragmentable;
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txb->last_sent = ktime_get_real();
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if (txb->wire.flags & RXRPC_REQUEST_ACK)
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rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data);
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|
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/* send the packet by UDP
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* - returns -EMSGSIZE if UDP would have to fragment the packet
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* to go out of the interface
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* - in which case, we'll have processed the ICMP error
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* message and update the peer record
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*/
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rxrpc_inc_stat(call->rxnet, stat_tx_data_send);
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ret = do_udp_sendmsg(conn->local->socket, &msg, len);
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conn->peer->last_tx_at = ktime_get_seconds();
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|
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if (ret < 0) {
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rxrpc_inc_stat(call->rxnet, stat_tx_data_send_fail);
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rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
|
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trace_rxrpc_tx_fail(call->debug_id, serial, ret,
|
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rxrpc_tx_point_call_data_nofrag);
|
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} else {
|
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trace_rxrpc_tx_packet(call->debug_id, &txb->wire,
|
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rxrpc_tx_point_call_data_nofrag);
|
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}
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|
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rxrpc_tx_backoff(call, ret);
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if (ret == -EMSGSIZE)
|
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goto send_fragmentable;
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|
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done:
|
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if (ret >= 0) {
|
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call->tx_last_sent = txb->last_sent;
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if (txb->wire.flags & RXRPC_REQUEST_ACK) {
|
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call->peer->rtt_last_req = txb->last_sent;
|
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if (call->peer->rtt_count > 1) {
|
|
unsigned long nowj = jiffies, ack_lost_at;
|
|
|
|
ack_lost_at = rxrpc_get_rto_backoff(call->peer, false);
|
|
ack_lost_at += nowj;
|
|
WRITE_ONCE(call->ack_lost_at, ack_lost_at);
|
|
rxrpc_reduce_call_timer(call, ack_lost_at, nowj,
|
|
rxrpc_timer_set_for_lost_ack);
|
|
}
|
|
}
|
|
|
|
if (txb->seq == 1 &&
|
|
!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER,
|
|
&call->flags)) {
|
|
unsigned long nowj = jiffies, expect_rx_by;
|
|
|
|
expect_rx_by = nowj + call->next_rx_timo;
|
|
WRITE_ONCE(call->expect_rx_by, expect_rx_by);
|
|
rxrpc_reduce_call_timer(call, expect_rx_by, nowj,
|
|
rxrpc_timer_set_for_normal);
|
|
}
|
|
|
|
rxrpc_set_keepalive(call);
|
|
} else {
|
|
/* Cancel the call if the initial transmission fails,
|
|
* particularly if that's due to network routing issues that
|
|
* aren't going away anytime soon. The layer above can arrange
|
|
* the retransmission.
|
|
*/
|
|
if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags))
|
|
rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
|
|
RX_USER_ABORT, ret);
|
|
}
|
|
|
|
_leave(" = %d [%u]", ret, call->peer->maxdata);
|
|
return ret;
|
|
|
|
send_fragmentable:
|
|
/* attempt to send this message with fragmentation enabled */
|
|
_debug("send fragment");
|
|
|
|
txb->last_sent = ktime_get_real();
|
|
if (txb->wire.flags & RXRPC_REQUEST_ACK)
|
|
rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data);
|
|
|
|
switch (conn->local->srx.transport.family) {
|
|
case AF_INET6:
|
|
case AF_INET:
|
|
ip_sock_set_mtu_discover(conn->local->socket->sk,
|
|
IP_PMTUDISC_DONT);
|
|
rxrpc_inc_stat(call->rxnet, stat_tx_data_send_frag);
|
|
ret = do_udp_sendmsg(conn->local->socket, &msg, len);
|
|
conn->peer->last_tx_at = ktime_get_seconds();
|
|
|
|
ip_sock_set_mtu_discover(conn->local->socket->sk,
|
|
IP_PMTUDISC_DO);
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
if (ret < 0) {
|
|
rxrpc_inc_stat(call->rxnet, stat_tx_data_send_fail);
|
|
rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
|
|
trace_rxrpc_tx_fail(call->debug_id, serial, ret,
|
|
rxrpc_tx_point_call_data_frag);
|
|
} else {
|
|
trace_rxrpc_tx_packet(call->debug_id, &txb->wire,
|
|
rxrpc_tx_point_call_data_frag);
|
|
}
|
|
rxrpc_tx_backoff(call, ret);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Transmit a connection-level abort.
|
|
*/
|
|
void rxrpc_send_conn_abort(struct rxrpc_connection *conn)
|
|
{
|
|
struct rxrpc_wire_header whdr;
|
|
struct msghdr msg;
|
|
struct kvec iov[2];
|
|
__be32 word;
|
|
size_t len;
|
|
u32 serial;
|
|
int ret;
|
|
|
|
msg.msg_name = &conn->peer->srx.transport;
|
|
msg.msg_namelen = conn->peer->srx.transport_len;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
whdr.epoch = htonl(conn->proto.epoch);
|
|
whdr.cid = htonl(conn->proto.cid);
|
|
whdr.callNumber = 0;
|
|
whdr.seq = 0;
|
|
whdr.type = RXRPC_PACKET_TYPE_ABORT;
|
|
whdr.flags = conn->out_clientflag;
|
|
whdr.userStatus = 0;
|
|
whdr.securityIndex = conn->security_ix;
|
|
whdr._rsvd = 0;
|
|
whdr.serviceId = htons(conn->service_id);
|
|
|
|
word = htonl(conn->abort_code);
|
|
|
|
iov[0].iov_base = &whdr;
|
|
iov[0].iov_len = sizeof(whdr);
|
|
iov[1].iov_base = &word;
|
|
iov[1].iov_len = sizeof(word);
|
|
|
|
len = iov[0].iov_len + iov[1].iov_len;
|
|
|
|
serial = atomic_inc_return(&conn->serial);
|
|
whdr.serial = htonl(serial);
|
|
|
|
iov_iter_kvec(&msg.msg_iter, WRITE, iov, 2, len);
|
|
ret = do_udp_sendmsg(conn->local->socket, &msg, len);
|
|
if (ret < 0) {
|
|
trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
|
|
rxrpc_tx_point_conn_abort);
|
|
_debug("sendmsg failed: %d", ret);
|
|
return;
|
|
}
|
|
|
|
trace_rxrpc_tx_packet(conn->debug_id, &whdr, rxrpc_tx_point_conn_abort);
|
|
|
|
conn->peer->last_tx_at = ktime_get_seconds();
|
|
}
|
|
|
|
/*
|
|
* Reject a packet through the local endpoint.
|
|
*/
|
|
void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
|
|
{
|
|
struct rxrpc_wire_header whdr;
|
|
struct sockaddr_rxrpc srx;
|
|
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
|
|
struct msghdr msg;
|
|
struct kvec iov[2];
|
|
size_t size;
|
|
__be32 code;
|
|
int ret, ioc;
|
|
|
|
rxrpc_see_skb(skb, rxrpc_skb_see_reject);
|
|
|
|
iov[0].iov_base = &whdr;
|
|
iov[0].iov_len = sizeof(whdr);
|
|
iov[1].iov_base = &code;
|
|
iov[1].iov_len = sizeof(code);
|
|
|
|
msg.msg_name = &srx.transport;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
memset(&whdr, 0, sizeof(whdr));
|
|
|
|
switch (skb->mark) {
|
|
case RXRPC_SKB_MARK_REJECT_BUSY:
|
|
whdr.type = RXRPC_PACKET_TYPE_BUSY;
|
|
size = sizeof(whdr);
|
|
ioc = 1;
|
|
break;
|
|
case RXRPC_SKB_MARK_REJECT_ABORT:
|
|
whdr.type = RXRPC_PACKET_TYPE_ABORT;
|
|
code = htonl(skb->priority);
|
|
size = sizeof(whdr) + sizeof(code);
|
|
ioc = 2;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) {
|
|
msg.msg_namelen = srx.transport_len;
|
|
|
|
whdr.epoch = htonl(sp->hdr.epoch);
|
|
whdr.cid = htonl(sp->hdr.cid);
|
|
whdr.callNumber = htonl(sp->hdr.callNumber);
|
|
whdr.serviceId = htons(sp->hdr.serviceId);
|
|
whdr.flags = sp->hdr.flags;
|
|
whdr.flags ^= RXRPC_CLIENT_INITIATED;
|
|
whdr.flags &= RXRPC_CLIENT_INITIATED;
|
|
|
|
iov_iter_kvec(&msg.msg_iter, WRITE, iov, ioc, size);
|
|
ret = do_udp_sendmsg(local->socket, &msg, size);
|
|
if (ret < 0)
|
|
trace_rxrpc_tx_fail(local->debug_id, 0, ret,
|
|
rxrpc_tx_point_reject);
|
|
else
|
|
trace_rxrpc_tx_packet(local->debug_id, &whdr,
|
|
rxrpc_tx_point_reject);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send a VERSION reply to a peer as a keepalive.
|
|
*/
|
|
void rxrpc_send_keepalive(struct rxrpc_peer *peer)
|
|
{
|
|
struct rxrpc_wire_header whdr;
|
|
struct msghdr msg;
|
|
struct kvec iov[2];
|
|
size_t len;
|
|
int ret;
|
|
|
|
_enter("");
|
|
|
|
msg.msg_name = &peer->srx.transport;
|
|
msg.msg_namelen = peer->srx.transport_len;
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
whdr.epoch = htonl(peer->local->rxnet->epoch);
|
|
whdr.cid = 0;
|
|
whdr.callNumber = 0;
|
|
whdr.seq = 0;
|
|
whdr.serial = 0;
|
|
whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */
|
|
whdr.flags = RXRPC_LAST_PACKET;
|
|
whdr.userStatus = 0;
|
|
whdr.securityIndex = 0;
|
|
whdr._rsvd = 0;
|
|
whdr.serviceId = 0;
|
|
|
|
iov[0].iov_base = &whdr;
|
|
iov[0].iov_len = sizeof(whdr);
|
|
iov[1].iov_base = (char *)rxrpc_keepalive_string;
|
|
iov[1].iov_len = sizeof(rxrpc_keepalive_string);
|
|
|
|
len = iov[0].iov_len + iov[1].iov_len;
|
|
|
|
iov_iter_kvec(&msg.msg_iter, WRITE, iov, 2, len);
|
|
ret = do_udp_sendmsg(peer->local->socket, &msg, len);
|
|
if (ret < 0)
|
|
trace_rxrpc_tx_fail(peer->debug_id, 0, ret,
|
|
rxrpc_tx_point_version_keepalive);
|
|
else
|
|
trace_rxrpc_tx_packet(peer->debug_id, &whdr,
|
|
rxrpc_tx_point_version_keepalive);
|
|
|
|
peer->last_tx_at = ktime_get_seconds();
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* Schedule an instant Tx resend.
|
|
*/
|
|
static inline void rxrpc_instant_resend(struct rxrpc_call *call,
|
|
struct rxrpc_txbuf *txb)
|
|
{
|
|
if (!__rxrpc_call_is_complete(call))
|
|
kdebug("resend");
|
|
}
|
|
|
|
/*
|
|
* Transmit one packet.
|
|
*/
|
|
void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb)
|
|
{
|
|
int ret;
|
|
|
|
ret = rxrpc_send_data_packet(call, txb);
|
|
if (ret < 0) {
|
|
switch (ret) {
|
|
case -ENETUNREACH:
|
|
case -EHOSTUNREACH:
|
|
case -ECONNREFUSED:
|
|
rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
|
|
0, ret);
|
|
break;
|
|
default:
|
|
_debug("need instant resend %d", ret);
|
|
rxrpc_instant_resend(call, txb);
|
|
}
|
|
} else {
|
|
unsigned long now = jiffies;
|
|
unsigned long resend_at = now + call->peer->rto_j;
|
|
|
|
WRITE_ONCE(call->resend_at, resend_at);
|
|
rxrpc_reduce_call_timer(call, resend_at, now,
|
|
rxrpc_timer_set_for_send);
|
|
}
|
|
}
|