v4.19.13 snapshot.
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
new file mode 100644
index 0000000..345dc1c
--- /dev/null
+++ b/net/rxrpc/output.c
@@ -0,0 +1,668 @@
+/* RxRPC packet transmission
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/net.h>
+#include <linux/gfp.h>
+#include <linux/skbuff.h>
+#include <linux/export.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+struct rxrpc_ack_buffer {
+ struct rxrpc_wire_header whdr;
+ struct rxrpc_ackpacket ack;
+ u8 acks[255];
+ u8 pad[3];
+ struct rxrpc_ackinfo ackinfo;
+};
+
+struct rxrpc_abort_buffer {
+ struct rxrpc_wire_header whdr;
+ __be32 abort_code;
+};
+
+static const char rxrpc_keepalive_string[] = "";
+
+/*
+ * Increase Tx backoff on transmission failure and clear it on success.
+ */
+static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret)
+{
+ if (ret < 0) {
+ u16 tx_backoff = READ_ONCE(call->tx_backoff);
+
+ if (tx_backoff < HZ)
+ WRITE_ONCE(call->tx_backoff, tx_backoff + 1);
+ } else {
+ WRITE_ONCE(call->tx_backoff, 0);
+ }
+}
+
+/*
+ * Arrange for a keepalive ping a certain time after we last transmitted. This
+ * lets the far side know we're still interested in this call and helps keep
+ * the route through any intervening firewall open.
+ *
+ * Receiving a response to the ping will prevent the ->expect_rx_by timer from
+ * expiring.
+ */
+static void rxrpc_set_keepalive(struct rxrpc_call *call)
+{
+ unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6;
+
+ keepalive_at += now;
+ WRITE_ONCE(call->keepalive_at, keepalive_at);
+ rxrpc_reduce_call_timer(call, keepalive_at, now,
+ rxrpc_timer_set_for_keepalive);
+}
+
+/*
+ * Fill out an ACK packet.
+ */
+static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
+ struct rxrpc_call *call,
+ struct rxrpc_ack_buffer *pkt,
+ rxrpc_seq_t *_hard_ack,
+ rxrpc_seq_t *_top,
+ u8 reason)
+{
+ rxrpc_serial_t serial;
+ rxrpc_seq_t hard_ack, top, seq;
+ int ix;
+ u32 mtu, jmax;
+ u8 *ackp = pkt->acks;
+
+ /* Barrier against rxrpc_input_data(). */
+ serial = call->ackr_serial;
+ hard_ack = READ_ONCE(call->rx_hard_ack);
+ top = smp_load_acquire(&call->rx_top);
+ *_hard_ack = hard_ack;
+ *_top = top;
+
+ pkt->ack.bufferSpace = htons(8);
+ pkt->ack.maxSkew = htons(call->ackr_skew);
+ pkt->ack.firstPacket = htonl(hard_ack + 1);
+ pkt->ack.previousPacket = htonl(call->ackr_prev_seq);
+ pkt->ack.serial = htonl(serial);
+ pkt->ack.reason = reason;
+ pkt->ack.nAcks = top - hard_ack;
+
+ if (reason == RXRPC_ACK_PING)
+ pkt->whdr.flags |= RXRPC_REQUEST_ACK;
+
+ if (after(top, hard_ack)) {
+ seq = hard_ack + 1;
+ do {
+ ix = seq & RXRPC_RXTX_BUFF_MASK;
+ if (call->rxtx_buffer[ix])
+ *ackp++ = RXRPC_ACK_TYPE_ACK;
+ else
+ *ackp++ = RXRPC_ACK_TYPE_NACK;
+ seq++;
+ } while (before_eq(seq, top));
+ }
+
+ mtu = conn->params.peer->if_mtu;
+ mtu -= conn->params.peer->hdrsize;
+ jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
+ pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
+ pkt->ackinfo.maxMTU = htonl(mtu);
+ pkt->ackinfo.rwind = htonl(call->rx_winsize);
+ pkt->ackinfo.jumbo_max = htonl(jmax);
+
+ *ackp++ = 0;
+ *ackp++ = 0;
+ *ackp++ = 0;
+ return top - hard_ack + 3;
+}
+
+/*
+ * Send an ACK call packet.
+ */
+int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
+ rxrpc_serial_t *_serial)
+{
+ struct rxrpc_connection *conn = NULL;
+ struct rxrpc_ack_buffer *pkt;
+ struct msghdr msg;
+ struct kvec iov[2];
+ rxrpc_serial_t serial;
+ rxrpc_seq_t hard_ack, top;
+ size_t len, n;
+ int ret;
+ u8 reason;
+
+ spin_lock_bh(&call->lock);
+ if (call->conn)
+ conn = rxrpc_get_connection_maybe(call->conn);
+ spin_unlock_bh(&call->lock);
+ if (!conn)
+ return -ECONNRESET;
+
+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt) {
+ rxrpc_put_connection(conn);
+ return -ENOMEM;
+ }
+
+ msg.msg_name = &call->peer->srx.transport;
+ msg.msg_namelen = call->peer->srx.transport_len;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ pkt->whdr.epoch = htonl(conn->proto.epoch);
+ pkt->whdr.cid = htonl(call->cid);
+ pkt->whdr.callNumber = htonl(call->call_id);
+ pkt->whdr.seq = 0;
+ pkt->whdr.type = RXRPC_PACKET_TYPE_ACK;
+ pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag;
+ pkt->whdr.userStatus = 0;
+ pkt->whdr.securityIndex = call->security_ix;
+ pkt->whdr._rsvd = 0;
+ pkt->whdr.serviceId = htons(call->service_id);
+
+ spin_lock_bh(&call->lock);
+ if (ping) {
+ reason = RXRPC_ACK_PING;
+ } else {
+ reason = call->ackr_reason;
+ if (!call->ackr_reason) {
+ spin_unlock_bh(&call->lock);
+ ret = 0;
+ goto out;
+ }
+ call->ackr_reason = 0;
+ }
+ n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason);
+
+ spin_unlock_bh(&call->lock);
+
+ iov[0].iov_base = pkt;
+ iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n;
+ iov[1].iov_base = &pkt->ackinfo;
+ iov[1].iov_len = sizeof(pkt->ackinfo);
+ len = iov[0].iov_len + iov[1].iov_len;
+
+ serial = atomic_inc_return(&conn->serial);
+ pkt->whdr.serial = htonl(serial);
+ trace_rxrpc_tx_ack(call->debug_id, serial,
+ ntohl(pkt->ack.firstPacket),
+ ntohl(pkt->ack.serial),
+ pkt->ack.reason, pkt->ack.nAcks);
+ if (_serial)
+ *_serial = serial;
+
+ if (ping) {
+ call->ping_serial = serial;
+ smp_wmb();
+ /* We need to stick a time in before we send the packet in case
+ * the reply gets back before kernel_sendmsg() completes - but
+ * asking UDP to send the packet can take a relatively long
+ * time.
+ */
+ call->ping_time = ktime_get_real();
+ set_bit(RXRPC_CALL_PINGING, &call->flags);
+ trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial);
+ }
+
+ ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
+ conn->params.peer->last_tx_at = ktime_get_seconds();
+ if (ret < 0)
+ trace_rxrpc_tx_fail(call->debug_id, serial, ret,
+ rxrpc_tx_point_call_ack);
+ else
+ trace_rxrpc_tx_packet(call->debug_id, &pkt->whdr,
+ rxrpc_tx_point_call_ack);
+ rxrpc_tx_backoff(call, ret);
+
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ if (ret < 0) {
+ if (ping)
+ clear_bit(RXRPC_CALL_PINGING, &call->flags);
+ rxrpc_propose_ACK(call, pkt->ack.reason,
+ ntohs(pkt->ack.maxSkew),
+ ntohl(pkt->ack.serial),
+ false, true,
+ rxrpc_propose_ack_retry_tx);
+ } else {
+ spin_lock_bh(&call->lock);
+ if (after(hard_ack, call->ackr_consumed))
+ call->ackr_consumed = hard_ack;
+ if (after(top, call->ackr_seen))
+ call->ackr_seen = top;
+ spin_unlock_bh(&call->lock);
+ }
+
+ rxrpc_set_keepalive(call);
+ }
+
+out:
+ rxrpc_put_connection(conn);
+ kfree(pkt);
+ return ret;
+}
+
+/*
+ * Send an ABORT call packet.
+ */
+int rxrpc_send_abort_packet(struct rxrpc_call *call)
+{
+ struct rxrpc_connection *conn = NULL;
+ struct rxrpc_abort_buffer pkt;
+ struct msghdr msg;
+ struct kvec iov[1];
+ rxrpc_serial_t serial;
+ int ret;
+
+ /* Don't bother sending aborts for a client call once the server has
+ * hard-ACK'd all of its request data. After that point, we're not
+ * going to stop the operation proceeding, and whilst we might limit
+ * the reply, it's not worth it if we can send a new call on the same
+ * channel instead, thereby closing off this call.
+ */
+ if (rxrpc_is_client_call(call) &&
+ test_bit(RXRPC_CALL_TX_LAST, &call->flags))
+ return 0;
+
+ spin_lock_bh(&call->lock);
+ if (call->conn)
+ conn = rxrpc_get_connection_maybe(call->conn);
+ spin_unlock_bh(&call->lock);
+ if (!conn)
+ return -ECONNRESET;
+
+ msg.msg_name = &call->peer->srx.transport;
+ msg.msg_namelen = call->peer->srx.transport_len;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ pkt.whdr.epoch = htonl(conn->proto.epoch);
+ pkt.whdr.cid = htonl(call->cid);
+ pkt.whdr.callNumber = htonl(call->call_id);
+ pkt.whdr.seq = 0;
+ pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT;
+ pkt.whdr.flags = conn->out_clientflag;
+ pkt.whdr.userStatus = 0;
+ pkt.whdr.securityIndex = call->security_ix;
+ pkt.whdr._rsvd = 0;
+ pkt.whdr.serviceId = htons(call->service_id);
+ pkt.abort_code = htonl(call->abort_code);
+
+ iov[0].iov_base = &pkt;
+ iov[0].iov_len = sizeof(pkt);
+
+ serial = atomic_inc_return(&conn->serial);
+ pkt.whdr.serial = htonl(serial);
+
+ ret = kernel_sendmsg(conn->params.local->socket,
+ &msg, iov, 1, sizeof(pkt));
+ conn->params.peer->last_tx_at = ktime_get_seconds();
+ if (ret < 0)
+ trace_rxrpc_tx_fail(call->debug_id, serial, ret,
+ rxrpc_tx_point_call_abort);
+ else
+ trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr,
+ rxrpc_tx_point_call_abort);
+ rxrpc_tx_backoff(call, ret);
+
+ rxrpc_put_connection(conn);
+ return ret;
+}
+
+/*
+ * send a packet through the transport endpoint
+ */
+int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
+ bool retrans)
+{
+ struct rxrpc_connection *conn = call->conn;
+ struct rxrpc_wire_header whdr;
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct msghdr msg;
+ struct kvec iov[2];
+ rxrpc_serial_t serial;
+ size_t len;
+ bool lost = false;
+ int ret, opt;
+
+ _enter(",{%d}", skb->len);
+
+ /* Each transmission of a Tx packet needs a new serial number */
+ serial = atomic_inc_return(&conn->serial);
+
+ whdr.epoch = htonl(conn->proto.epoch);
+ whdr.cid = htonl(call->cid);
+ whdr.callNumber = htonl(call->call_id);
+ whdr.seq = htonl(sp->hdr.seq);
+ whdr.serial = htonl(serial);
+ whdr.type = RXRPC_PACKET_TYPE_DATA;
+ whdr.flags = sp->hdr.flags;
+ whdr.userStatus = 0;
+ whdr.securityIndex = call->security_ix;
+ whdr._rsvd = htons(sp->hdr._rsvd);
+ whdr.serviceId = htons(call->service_id);
+
+ if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) &&
+ sp->hdr.seq == 1)
+ whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE;
+
+ iov[0].iov_base = &whdr;
+ iov[0].iov_len = sizeof(whdr);
+ iov[1].iov_base = skb->head;
+ iov[1].iov_len = skb->len;
+ len = iov[0].iov_len + iov[1].iov_len;
+
+ msg.msg_name = &call->peer->srx.transport;
+ msg.msg_namelen = call->peer->srx.transport_len;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ /* If our RTT cache needs working on, request an ACK. Also request
+ * ACKs if a DATA packet appears to have been lost.
+ *
+ * However, we mustn't request an ACK on the last reply packet of a
+ * service call, lest OpenAFS incorrectly send us an ACK with some
+ * soft-ACKs in it and then never follow up with a proper hard ACK.
+ */
+ if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) ||
+ rxrpc_to_server(sp)
+ ) &&
+ (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) ||
+ retrans ||
+ call->cong_mode == RXRPC_CALL_SLOW_START ||
+ (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) ||
+ ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000),
+ ktime_get_real())))
+ whdr.flags |= RXRPC_REQUEST_ACK;
+
+ if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
+ static int lose;
+ if ((lose++ & 7) == 7) {
+ ret = 0;
+ lost = true;
+ goto done;
+ }
+ }
+
+ _proto("Tx DATA %%%u { #%u }", serial, sp->hdr.seq);
+
+ /* send the packet with the don't fragment bit set if we currently
+ * think it's small enough */
+ if (iov[1].iov_len >= call->peer->maxdata)
+ goto send_fragmentable;
+
+ down_read(&conn->params.local->defrag_sem);
+
+ sp->hdr.serial = serial;
+ smp_wmb(); /* Set serial before timestamp */
+ skb->tstamp = ktime_get_real();
+
+ /* send the packet by UDP
+ * - returns -EMSGSIZE if UDP would have to fragment the packet
+ * to go out of the interface
+ * - in which case, we'll have processed the ICMP error
+ * message and update the peer record
+ */
+ ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
+ conn->params.peer->last_tx_at = ktime_get_seconds();
+
+ up_read(&conn->params.local->defrag_sem);
+ if (ret < 0)
+ trace_rxrpc_tx_fail(call->debug_id, serial, ret,
+ rxrpc_tx_point_call_data_nofrag);
+ else
+ trace_rxrpc_tx_packet(call->debug_id, &whdr,
+ rxrpc_tx_point_call_data_nofrag);
+ rxrpc_tx_backoff(call, ret);
+ if (ret == -EMSGSIZE)
+ goto send_fragmentable;
+
+done:
+ trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags,
+ retrans, lost);
+ if (ret >= 0) {
+ if (whdr.flags & RXRPC_REQUEST_ACK) {
+ call->peer->rtt_last_req = skb->tstamp;
+ trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial);
+ if (call->peer->rtt_usage > 1) {
+ unsigned long nowj = jiffies, ack_lost_at;
+
+ ack_lost_at = nsecs_to_jiffies(2 * call->peer->rtt);
+ if (ack_lost_at < 1)
+ ack_lost_at = 1;
+
+ 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 (sp->hdr.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");
+
+ down_write(&conn->params.local->defrag_sem);
+
+ sp->hdr.serial = serial;
+ smp_wmb(); /* Set serial before timestamp */
+ skb->tstamp = ktime_get_real();
+
+ switch (conn->params.local->srx.transport.family) {
+ case AF_INET:
+ opt = IP_PMTUDISC_DONT;
+ ret = kernel_setsockopt(conn->params.local->socket,
+ SOL_IP, IP_MTU_DISCOVER,
+ (char *)&opt, sizeof(opt));
+ if (ret == 0) {
+ ret = kernel_sendmsg(conn->params.local->socket, &msg,
+ iov, 2, len);
+ conn->params.peer->last_tx_at = ktime_get_seconds();
+
+ opt = IP_PMTUDISC_DO;
+ kernel_setsockopt(conn->params.local->socket, SOL_IP,
+ IP_MTU_DISCOVER,
+ (char *)&opt, sizeof(opt));
+ }
+ break;
+
+#ifdef CONFIG_AF_RXRPC_IPV6
+ case AF_INET6:
+ opt = IPV6_PMTUDISC_DONT;
+ ret = kernel_setsockopt(conn->params.local->socket,
+ SOL_IPV6, IPV6_MTU_DISCOVER,
+ (char *)&opt, sizeof(opt));
+ if (ret == 0) {
+ ret = kernel_sendmsg(conn->params.local->socket, &msg,
+ iov, 2, len);
+ conn->params.peer->last_tx_at = ktime_get_seconds();
+
+ opt = IPV6_PMTUDISC_DO;
+ kernel_setsockopt(conn->params.local->socket,
+ SOL_IPV6, IPV6_MTU_DISCOVER,
+ (char *)&opt, sizeof(opt));
+ }
+ break;
+#endif
+ }
+
+ if (ret < 0)
+ trace_rxrpc_tx_fail(call->debug_id, serial, ret,
+ rxrpc_tx_point_call_data_frag);
+ else
+ trace_rxrpc_tx_packet(call->debug_id, &whdr,
+ rxrpc_tx_point_call_data_frag);
+ rxrpc_tx_backoff(call, ret);
+
+ up_write(&conn->params.local->defrag_sem);
+ goto done;
+}
+
+/*
+ * reject packets through the local endpoint
+ */
+void rxrpc_reject_packets(struct rxrpc_local *local)
+{
+ struct sockaddr_rxrpc srx;
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_wire_header whdr;
+ struct sk_buff *skb;
+ struct msghdr msg;
+ struct kvec iov[2];
+ size_t size;
+ __be32 code;
+ int ret, ioc;
+
+ _enter("%d", local->debug_id);
+
+ 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));
+
+ while ((skb = skb_dequeue(&local->reject_queue))) {
+ rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
+ sp = rxrpc_skb(skb);
+
+ 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:
+ rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
+ continue;
+ }
+
+ if (rxrpc_extract_addr_from_skb(local, &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;
+
+ ret = kernel_sendmsg(local->socket, &msg,
+ iov, ioc, 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);
+ }
+
+ rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
+ }
+
+ _leave("");
+}
+
+/*
+ * 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;
+
+ _proto("Tx VERSION (keepalive)");
+
+ ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, 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("");
+}