1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* RxRPC packet transmission
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/net.h>
11 #include <linux/gfp.h>
12 #include <linux/skbuff.h>
13 #include <linux/export.h>
14 #include <net/sock.h>
15 #include <net/af_rxrpc.h>
16 #include "ar-internal.h"
17
18 struct rxrpc_ack_buffer {
19 struct rxrpc_wire_header whdr;
20 struct rxrpc_ackpacket ack;
21 u8 acks[255];
22 u8 pad[3];
23 struct rxrpc_ackinfo ackinfo;
24 };
25
26 struct rxrpc_abort_buffer {
27 struct rxrpc_wire_header whdr;
28 __be32 abort_code;
29 };
30
31 static const char rxrpc_keepalive_string[] = "";
32
33 /*
34 * Increase Tx backoff on transmission failure and clear it on success.
35 */
rxrpc_tx_backoff(struct rxrpc_call * call,int ret)36 static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret)
37 {
38 if (ret < 0) {
39 u16 tx_backoff = READ_ONCE(call->tx_backoff);
40
41 if (tx_backoff < HZ)
42 WRITE_ONCE(call->tx_backoff, tx_backoff + 1);
43 } else {
44 WRITE_ONCE(call->tx_backoff, 0);
45 }
46 }
47
48 /*
49 * Arrange for a keepalive ping a certain time after we last transmitted. This
50 * lets the far side know we're still interested in this call and helps keep
51 * the route through any intervening firewall open.
52 *
53 * Receiving a response to the ping will prevent the ->expect_rx_by timer from
54 * expiring.
55 */
rxrpc_set_keepalive(struct rxrpc_call * call)56 static void rxrpc_set_keepalive(struct rxrpc_call *call)
57 {
58 unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6;
59
60 keepalive_at += now;
61 WRITE_ONCE(call->keepalive_at, keepalive_at);
62 rxrpc_reduce_call_timer(call, keepalive_at, now,
63 rxrpc_timer_set_for_keepalive);
64 }
65
66 /*
67 * Fill out an ACK packet.
68 */
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)69 static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
70 struct rxrpc_call *call,
71 struct rxrpc_ack_buffer *pkt,
72 rxrpc_seq_t *_hard_ack,
73 rxrpc_seq_t *_top,
74 u8 reason)
75 {
76 rxrpc_serial_t serial;
77 unsigned int tmp;
78 rxrpc_seq_t hard_ack, top, seq;
79 int ix;
80 u32 mtu, jmax;
81 u8 *ackp = pkt->acks;
82
83 tmp = atomic_xchg(&call->ackr_nr_unacked, 0);
84 tmp |= atomic_xchg(&call->ackr_nr_consumed, 0);
85 if (!tmp && (reason == RXRPC_ACK_DELAY ||
86 reason == RXRPC_ACK_IDLE))
87 return 0;
88
89 /* Barrier against rxrpc_input_data(). */
90 serial = call->ackr_serial;
91 hard_ack = READ_ONCE(call->rx_hard_ack);
92 top = smp_load_acquire(&call->rx_top);
93 *_hard_ack = hard_ack;
94 *_top = top;
95
96 pkt->ack.bufferSpace = htons(0);
97 pkt->ack.maxSkew = htons(0);
98 pkt->ack.firstPacket = htonl(hard_ack + 1);
99 pkt->ack.previousPacket = htonl(call->ackr_highest_seq);
100 pkt->ack.serial = htonl(serial);
101 pkt->ack.reason = reason;
102 pkt->ack.nAcks = top - hard_ack;
103
104 if (reason == RXRPC_ACK_PING)
105 pkt->whdr.flags |= RXRPC_REQUEST_ACK;
106
107 if (after(top, hard_ack)) {
108 seq = hard_ack + 1;
109 do {
110 ix = seq & RXRPC_RXTX_BUFF_MASK;
111 if (call->rxtx_buffer[ix])
112 *ackp++ = RXRPC_ACK_TYPE_ACK;
113 else
114 *ackp++ = RXRPC_ACK_TYPE_NACK;
115 seq++;
116 } while (before_eq(seq, top));
117 }
118
119 mtu = conn->params.peer->if_mtu;
120 mtu -= conn->params.peer->hdrsize;
121 jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
122 pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
123 pkt->ackinfo.maxMTU = htonl(mtu);
124 pkt->ackinfo.rwind = htonl(call->rx_winsize);
125 pkt->ackinfo.jumbo_max = htonl(jmax);
126
127 *ackp++ = 0;
128 *ackp++ = 0;
129 *ackp++ = 0;
130 return top - hard_ack + 3;
131 }
132
133 /*
134 * Send an ACK call packet.
135 */
rxrpc_send_ack_packet(struct rxrpc_call * call,bool ping,rxrpc_serial_t * _serial)136 int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
137 rxrpc_serial_t *_serial)
138 {
139 struct rxrpc_connection *conn;
140 struct rxrpc_ack_buffer *pkt;
141 struct msghdr msg;
142 struct kvec iov[2];
143 rxrpc_serial_t serial;
144 rxrpc_seq_t hard_ack, top;
145 size_t len, n;
146 int ret;
147 u8 reason;
148
149 if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
150 return -ECONNRESET;
151
152 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
153 if (!pkt)
154 return -ENOMEM;
155
156 conn = call->conn;
157
158 msg.msg_name = &call->peer->srx.transport;
159 msg.msg_namelen = call->peer->srx.transport_len;
160 msg.msg_control = NULL;
161 msg.msg_controllen = 0;
162 msg.msg_flags = 0;
163
164 pkt->whdr.epoch = htonl(conn->proto.epoch);
165 pkt->whdr.cid = htonl(call->cid);
166 pkt->whdr.callNumber = htonl(call->call_id);
167 pkt->whdr.seq = 0;
168 pkt->whdr.type = RXRPC_PACKET_TYPE_ACK;
169 pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag;
170 pkt->whdr.userStatus = 0;
171 pkt->whdr.securityIndex = call->security_ix;
172 pkt->whdr._rsvd = 0;
173 pkt->whdr.serviceId = htons(call->service_id);
174
175 spin_lock_bh(&call->lock);
176 if (ping) {
177 reason = RXRPC_ACK_PING;
178 } else {
179 reason = call->ackr_reason;
180 if (!call->ackr_reason) {
181 spin_unlock_bh(&call->lock);
182 ret = 0;
183 goto out;
184 }
185 call->ackr_reason = 0;
186 }
187 n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason);
188
189 spin_unlock_bh(&call->lock);
190 if (n == 0) {
191 kfree(pkt);
192 return 0;
193 }
194
195 iov[0].iov_base = pkt;
196 iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n;
197 iov[1].iov_base = &pkt->ackinfo;
198 iov[1].iov_len = sizeof(pkt->ackinfo);
199 len = iov[0].iov_len + iov[1].iov_len;
200
201 serial = atomic_inc_return(&conn->serial);
202 pkt->whdr.serial = htonl(serial);
203 trace_rxrpc_tx_ack(call->debug_id, serial,
204 ntohl(pkt->ack.firstPacket),
205 ntohl(pkt->ack.serial),
206 pkt->ack.reason, pkt->ack.nAcks);
207 if (_serial)
208 *_serial = serial;
209
210 if (ping) {
211 call->ping_serial = serial;
212 smp_wmb();
213 /* We need to stick a time in before we send the packet in case
214 * the reply gets back before kernel_sendmsg() completes - but
215 * asking UDP to send the packet can take a relatively long
216 * time.
217 */
218 call->ping_time = ktime_get_real();
219 set_bit(RXRPC_CALL_PINGING, &call->flags);
220 trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial);
221 }
222
223 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
224 conn->params.peer->last_tx_at = ktime_get_seconds();
225 if (ret < 0)
226 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
227 rxrpc_tx_point_call_ack);
228 else
229 trace_rxrpc_tx_packet(call->debug_id, &pkt->whdr,
230 rxrpc_tx_point_call_ack);
231 rxrpc_tx_backoff(call, ret);
232
233 if (call->state < RXRPC_CALL_COMPLETE) {
234 if (ret < 0) {
235 if (ping)
236 clear_bit(RXRPC_CALL_PINGING, &call->flags);
237 rxrpc_propose_ACK(call, pkt->ack.reason,
238 ntohl(pkt->ack.serial),
239 false, true,
240 rxrpc_propose_ack_retry_tx);
241 }
242
243 rxrpc_set_keepalive(call);
244 }
245
246 out:
247 kfree(pkt);
248 return ret;
249 }
250
251 /*
252 * Send an ABORT call packet.
253 */
rxrpc_send_abort_packet(struct rxrpc_call * call)254 int rxrpc_send_abort_packet(struct rxrpc_call *call)
255 {
256 struct rxrpc_connection *conn;
257 struct rxrpc_abort_buffer pkt;
258 struct msghdr msg;
259 struct kvec iov[1];
260 rxrpc_serial_t serial;
261 int ret;
262
263 /* Don't bother sending aborts for a client call once the server has
264 * hard-ACK'd all of its request data. After that point, we're not
265 * going to stop the operation proceeding, and whilst we might limit
266 * the reply, it's not worth it if we can send a new call on the same
267 * channel instead, thereby closing off this call.
268 */
269 if (rxrpc_is_client_call(call) &&
270 test_bit(RXRPC_CALL_TX_LAST, &call->flags))
271 return 0;
272
273 if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
274 return -ECONNRESET;
275
276 conn = call->conn;
277
278 msg.msg_name = &call->peer->srx.transport;
279 msg.msg_namelen = call->peer->srx.transport_len;
280 msg.msg_control = NULL;
281 msg.msg_controllen = 0;
282 msg.msg_flags = 0;
283
284 pkt.whdr.epoch = htonl(conn->proto.epoch);
285 pkt.whdr.cid = htonl(call->cid);
286 pkt.whdr.callNumber = htonl(call->call_id);
287 pkt.whdr.seq = 0;
288 pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT;
289 pkt.whdr.flags = conn->out_clientflag;
290 pkt.whdr.userStatus = 0;
291 pkt.whdr.securityIndex = call->security_ix;
292 pkt.whdr._rsvd = 0;
293 pkt.whdr.serviceId = htons(call->service_id);
294 pkt.abort_code = htonl(call->abort_code);
295
296 iov[0].iov_base = &pkt;
297 iov[0].iov_len = sizeof(pkt);
298
299 serial = atomic_inc_return(&conn->serial);
300 pkt.whdr.serial = htonl(serial);
301
302 ret = kernel_sendmsg(conn->params.local->socket,
303 &msg, iov, 1, sizeof(pkt));
304 conn->params.peer->last_tx_at = ktime_get_seconds();
305 if (ret < 0)
306 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
307 rxrpc_tx_point_call_abort);
308 else
309 trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr,
310 rxrpc_tx_point_call_abort);
311 rxrpc_tx_backoff(call, ret);
312 return ret;
313 }
314
315 /*
316 * send a packet through the transport endpoint
317 */
rxrpc_send_data_packet(struct rxrpc_call * call,struct sk_buff * skb,bool retrans)318 int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
319 bool retrans)
320 {
321 struct rxrpc_connection *conn = call->conn;
322 struct rxrpc_wire_header whdr;
323 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
324 struct msghdr msg;
325 struct kvec iov[2];
326 rxrpc_serial_t serial;
327 size_t len;
328 int ret, opt;
329
330 _enter(",{%d}", skb->len);
331
332 /* Each transmission of a Tx packet needs a new serial number */
333 serial = atomic_inc_return(&conn->serial);
334
335 whdr.epoch = htonl(conn->proto.epoch);
336 whdr.cid = htonl(call->cid);
337 whdr.callNumber = htonl(call->call_id);
338 whdr.seq = htonl(sp->hdr.seq);
339 whdr.serial = htonl(serial);
340 whdr.type = RXRPC_PACKET_TYPE_DATA;
341 whdr.flags = sp->hdr.flags;
342 whdr.userStatus = 0;
343 whdr.securityIndex = call->security_ix;
344 whdr._rsvd = htons(sp->hdr._rsvd);
345 whdr.serviceId = htons(call->service_id);
346
347 if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) &&
348 sp->hdr.seq == 1)
349 whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE;
350
351 iov[0].iov_base = &whdr;
352 iov[0].iov_len = sizeof(whdr);
353 iov[1].iov_base = skb->head;
354 iov[1].iov_len = skb->len;
355 len = iov[0].iov_len + iov[1].iov_len;
356
357 msg.msg_name = &call->peer->srx.transport;
358 msg.msg_namelen = call->peer->srx.transport_len;
359 msg.msg_control = NULL;
360 msg.msg_controllen = 0;
361 msg.msg_flags = 0;
362
363 /* If our RTT cache needs working on, request an ACK. Also request
364 * ACKs if a DATA packet appears to have been lost.
365 *
366 * However, we mustn't request an ACK on the last reply packet of a
367 * service call, lest OpenAFS incorrectly send us an ACK with some
368 * soft-ACKs in it and then never follow up with a proper hard ACK.
369 */
370 if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) ||
371 rxrpc_to_server(sp)
372 ) &&
373 (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) ||
374 retrans ||
375 call->cong_mode == RXRPC_CALL_SLOW_START ||
376 (call->peer->rtt_count < 3 && sp->hdr.seq & 1) ||
377 ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000),
378 ktime_get_real())))
379 whdr.flags |= RXRPC_REQUEST_ACK;
380
381 if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
382 static int lose;
383 if ((lose++ & 7) == 7) {
384 ret = 0;
385 trace_rxrpc_tx_data(call, sp->hdr.seq, serial,
386 whdr.flags, retrans, true);
387 goto done;
388 }
389 }
390
391 trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, retrans,
392 false);
393
394 /* send the packet with the don't fragment bit set if we currently
395 * think it's small enough */
396 if (iov[1].iov_len >= call->peer->maxdata)
397 goto send_fragmentable;
398
399 down_read(&conn->params.local->defrag_sem);
400
401 sp->hdr.serial = serial;
402 smp_wmb(); /* Set serial before timestamp */
403 skb->tstamp = ktime_get_real();
404
405 /* send the packet by UDP
406 * - returns -EMSGSIZE if UDP would have to fragment the packet
407 * to go out of the interface
408 * - in which case, we'll have processed the ICMP error
409 * message and update the peer record
410 */
411 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
412 conn->params.peer->last_tx_at = ktime_get_seconds();
413
414 up_read(&conn->params.local->defrag_sem);
415 if (ret < 0)
416 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
417 rxrpc_tx_point_call_data_nofrag);
418 else
419 trace_rxrpc_tx_packet(call->debug_id, &whdr,
420 rxrpc_tx_point_call_data_nofrag);
421 rxrpc_tx_backoff(call, ret);
422 if (ret == -EMSGSIZE)
423 goto send_fragmentable;
424
425 done:
426 if (ret >= 0) {
427 if (whdr.flags & RXRPC_REQUEST_ACK) {
428 call->peer->rtt_last_req = skb->tstamp;
429 trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial);
430 if (call->peer->rtt_count > 1) {
431 unsigned long nowj = jiffies, ack_lost_at;
432
433 ack_lost_at = rxrpc_get_rto_backoff(call->peer, false);
434 ack_lost_at += nowj;
435 WRITE_ONCE(call->ack_lost_at, ack_lost_at);
436 rxrpc_reduce_call_timer(call, ack_lost_at, nowj,
437 rxrpc_timer_set_for_lost_ack);
438 }
439 }
440
441 if (sp->hdr.seq == 1 &&
442 !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER,
443 &call->flags)) {
444 unsigned long nowj = jiffies, expect_rx_by;
445
446 expect_rx_by = nowj + call->next_rx_timo;
447 WRITE_ONCE(call->expect_rx_by, expect_rx_by);
448 rxrpc_reduce_call_timer(call, expect_rx_by, nowj,
449 rxrpc_timer_set_for_normal);
450 }
451
452 rxrpc_set_keepalive(call);
453 } else {
454 /* Cancel the call if the initial transmission fails,
455 * particularly if that's due to network routing issues that
456 * aren't going away anytime soon. The layer above can arrange
457 * the retransmission.
458 */
459 if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags))
460 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
461 RX_USER_ABORT, ret);
462 }
463
464 _leave(" = %d [%u]", ret, call->peer->maxdata);
465 return ret;
466
467 send_fragmentable:
468 /* attempt to send this message with fragmentation enabled */
469 _debug("send fragment");
470
471 down_write(&conn->params.local->defrag_sem);
472
473 sp->hdr.serial = serial;
474 smp_wmb(); /* Set serial before timestamp */
475 skb->tstamp = ktime_get_real();
476
477 switch (conn->params.local->srx.transport.family) {
478 case AF_INET6:
479 case AF_INET:
480 opt = IP_PMTUDISC_DONT;
481 kernel_setsockopt(conn->params.local->socket,
482 SOL_IP, IP_MTU_DISCOVER,
483 (char *)&opt, sizeof(opt));
484 ret = kernel_sendmsg(conn->params.local->socket, &msg,
485 iov, 2, len);
486 conn->params.peer->last_tx_at = ktime_get_seconds();
487
488 opt = IP_PMTUDISC_DO;
489 kernel_setsockopt(conn->params.local->socket,
490 SOL_IP, IP_MTU_DISCOVER,
491 (char *)&opt, sizeof(opt));
492 break;
493
494 default:
495 BUG();
496 }
497
498 if (ret < 0)
499 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
500 rxrpc_tx_point_call_data_frag);
501 else
502 trace_rxrpc_tx_packet(call->debug_id, &whdr,
503 rxrpc_tx_point_call_data_frag);
504 rxrpc_tx_backoff(call, ret);
505
506 up_write(&conn->params.local->defrag_sem);
507 goto done;
508 }
509
510 /*
511 * reject packets through the local endpoint
512 */
rxrpc_reject_packets(struct rxrpc_local * local)513 void rxrpc_reject_packets(struct rxrpc_local *local)
514 {
515 struct sockaddr_rxrpc srx;
516 struct rxrpc_skb_priv *sp;
517 struct rxrpc_wire_header whdr;
518 struct sk_buff *skb;
519 struct msghdr msg;
520 struct kvec iov[2];
521 size_t size;
522 __be32 code;
523 int ret, ioc;
524
525 _enter("%d", local->debug_id);
526
527 iov[0].iov_base = &whdr;
528 iov[0].iov_len = sizeof(whdr);
529 iov[1].iov_base = &code;
530 iov[1].iov_len = sizeof(code);
531
532 msg.msg_name = &srx.transport;
533 msg.msg_control = NULL;
534 msg.msg_controllen = 0;
535 msg.msg_flags = 0;
536
537 memset(&whdr, 0, sizeof(whdr));
538
539 while ((skb = skb_dequeue(&local->reject_queue))) {
540 rxrpc_see_skb(skb, rxrpc_skb_seen);
541 sp = rxrpc_skb(skb);
542
543 switch (skb->mark) {
544 case RXRPC_SKB_MARK_REJECT_BUSY:
545 whdr.type = RXRPC_PACKET_TYPE_BUSY;
546 size = sizeof(whdr);
547 ioc = 1;
548 break;
549 case RXRPC_SKB_MARK_REJECT_ABORT:
550 whdr.type = RXRPC_PACKET_TYPE_ABORT;
551 code = htonl(skb->priority);
552 size = sizeof(whdr) + sizeof(code);
553 ioc = 2;
554 break;
555 default:
556 rxrpc_free_skb(skb, rxrpc_skb_freed);
557 continue;
558 }
559
560 if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) {
561 msg.msg_namelen = srx.transport_len;
562
563 whdr.epoch = htonl(sp->hdr.epoch);
564 whdr.cid = htonl(sp->hdr.cid);
565 whdr.callNumber = htonl(sp->hdr.callNumber);
566 whdr.serviceId = htons(sp->hdr.serviceId);
567 whdr.flags = sp->hdr.flags;
568 whdr.flags ^= RXRPC_CLIENT_INITIATED;
569 whdr.flags &= RXRPC_CLIENT_INITIATED;
570
571 ret = kernel_sendmsg(local->socket, &msg,
572 iov, ioc, size);
573 if (ret < 0)
574 trace_rxrpc_tx_fail(local->debug_id, 0, ret,
575 rxrpc_tx_point_reject);
576 else
577 trace_rxrpc_tx_packet(local->debug_id, &whdr,
578 rxrpc_tx_point_reject);
579 }
580
581 rxrpc_free_skb(skb, rxrpc_skb_freed);
582 }
583
584 _leave("");
585 }
586
587 /*
588 * Send a VERSION reply to a peer as a keepalive.
589 */
rxrpc_send_keepalive(struct rxrpc_peer * peer)590 void rxrpc_send_keepalive(struct rxrpc_peer *peer)
591 {
592 struct rxrpc_wire_header whdr;
593 struct msghdr msg;
594 struct kvec iov[2];
595 size_t len;
596 int ret;
597
598 _enter("");
599
600 msg.msg_name = &peer->srx.transport;
601 msg.msg_namelen = peer->srx.transport_len;
602 msg.msg_control = NULL;
603 msg.msg_controllen = 0;
604 msg.msg_flags = 0;
605
606 whdr.epoch = htonl(peer->local->rxnet->epoch);
607 whdr.cid = 0;
608 whdr.callNumber = 0;
609 whdr.seq = 0;
610 whdr.serial = 0;
611 whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */
612 whdr.flags = RXRPC_LAST_PACKET;
613 whdr.userStatus = 0;
614 whdr.securityIndex = 0;
615 whdr._rsvd = 0;
616 whdr.serviceId = 0;
617
618 iov[0].iov_base = &whdr;
619 iov[0].iov_len = sizeof(whdr);
620 iov[1].iov_base = (char *)rxrpc_keepalive_string;
621 iov[1].iov_len = sizeof(rxrpc_keepalive_string);
622
623 len = iov[0].iov_len + iov[1].iov_len;
624
625 _proto("Tx VERSION (keepalive)");
626
627 ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len);
628 if (ret < 0)
629 trace_rxrpc_tx_fail(peer->debug_id, 0, ret,
630 rxrpc_tx_point_version_keepalive);
631 else
632 trace_rxrpc_tx_packet(peer->debug_id, &whdr,
633 rxrpc_tx_point_version_keepalive);
634
635 peer->last_tx_at = ktime_get_seconds();
636 _leave("");
637 }
638