1 /* RxRPC packet transmission
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <linux/net.h>
15 #include <linux/gfp.h>
16 #include <linux/skbuff.h>
17 #include <linux/export.h>
18 #include <net/sock.h>
19 #include <net/af_rxrpc.h>
20 #include "ar-internal.h"
21
22 struct rxrpc_ack_buffer {
23 struct rxrpc_wire_header whdr;
24 struct rxrpc_ackpacket ack;
25 u8 acks[255];
26 u8 pad[3];
27 struct rxrpc_ackinfo ackinfo;
28 };
29
30 struct rxrpc_abort_buffer {
31 struct rxrpc_wire_header whdr;
32 __be32 abort_code;
33 };
34
35 static const char rxrpc_keepalive_string[] = "";
36
37 /*
38 * Increase Tx backoff on transmission failure and clear it on success.
39 */
rxrpc_tx_backoff(struct rxrpc_call * call,int ret)40 static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret)
41 {
42 if (ret < 0) {
43 u16 tx_backoff = READ_ONCE(call->tx_backoff);
44
45 if (tx_backoff < HZ)
46 WRITE_ONCE(call->tx_backoff, tx_backoff + 1);
47 } else {
48 WRITE_ONCE(call->tx_backoff, 0);
49 }
50 }
51
52 /*
53 * Arrange for a keepalive ping a certain time after we last transmitted. This
54 * lets the far side know we're still interested in this call and helps keep
55 * the route through any intervening firewall open.
56 *
57 * Receiving a response to the ping will prevent the ->expect_rx_by timer from
58 * expiring.
59 */
rxrpc_set_keepalive(struct rxrpc_call * call)60 static void rxrpc_set_keepalive(struct rxrpc_call *call)
61 {
62 unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6;
63
64 keepalive_at += now;
65 WRITE_ONCE(call->keepalive_at, keepalive_at);
66 rxrpc_reduce_call_timer(call, keepalive_at, now,
67 rxrpc_timer_set_for_keepalive);
68 }
69
70 /*
71 * Fill out an ACK packet.
72 */
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)73 static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
74 struct rxrpc_call *call,
75 struct rxrpc_ack_buffer *pkt,
76 rxrpc_seq_t *_hard_ack,
77 rxrpc_seq_t *_top,
78 u8 reason)
79 {
80 rxrpc_serial_t serial;
81 rxrpc_seq_t hard_ack, top, seq;
82 int ix;
83 u32 mtu, jmax;
84 u8 *ackp = pkt->acks;
85
86 /* Barrier against rxrpc_input_data(). */
87 serial = call->ackr_serial;
88 hard_ack = READ_ONCE(call->rx_hard_ack);
89 top = smp_load_acquire(&call->rx_top);
90 *_hard_ack = hard_ack;
91 *_top = top;
92
93 pkt->ack.bufferSpace = htons(8);
94 pkt->ack.maxSkew = htons(call->ackr_skew);
95 pkt->ack.firstPacket = htonl(hard_ack + 1);
96 pkt->ack.previousPacket = htonl(call->ackr_prev_seq);
97 pkt->ack.serial = htonl(serial);
98 pkt->ack.reason = reason;
99 pkt->ack.nAcks = top - hard_ack;
100
101 if (reason == RXRPC_ACK_PING)
102 pkt->whdr.flags |= RXRPC_REQUEST_ACK;
103
104 if (after(top, hard_ack)) {
105 seq = hard_ack + 1;
106 do {
107 ix = seq & RXRPC_RXTX_BUFF_MASK;
108 if (call->rxtx_buffer[ix])
109 *ackp++ = RXRPC_ACK_TYPE_ACK;
110 else
111 *ackp++ = RXRPC_ACK_TYPE_NACK;
112 seq++;
113 } while (before_eq(seq, top));
114 }
115
116 mtu = conn->params.peer->if_mtu;
117 mtu -= conn->params.peer->hdrsize;
118 jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
119 pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
120 pkt->ackinfo.maxMTU = htonl(mtu);
121 pkt->ackinfo.rwind = htonl(call->rx_winsize);
122 pkt->ackinfo.jumbo_max = htonl(jmax);
123
124 *ackp++ = 0;
125 *ackp++ = 0;
126 *ackp++ = 0;
127 return top - hard_ack + 3;
128 }
129
130 /*
131 * Send an ACK call packet.
132 */
rxrpc_send_ack_packet(struct rxrpc_call * call,bool ping,rxrpc_serial_t * _serial)133 int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
134 rxrpc_serial_t *_serial)
135 {
136 struct rxrpc_connection *conn;
137 struct rxrpc_ack_buffer *pkt;
138 struct msghdr msg;
139 struct kvec iov[2];
140 rxrpc_serial_t serial;
141 rxrpc_seq_t hard_ack, top;
142 size_t len, n;
143 int ret;
144 u8 reason;
145
146 if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
147 return -ECONNRESET;
148
149 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
150 if (!pkt)
151 return -ENOMEM;
152
153 conn = call->conn;
154
155 msg.msg_name = &call->peer->srx.transport;
156 msg.msg_namelen = call->peer->srx.transport_len;
157 msg.msg_control = NULL;
158 msg.msg_controllen = 0;
159 msg.msg_flags = 0;
160
161 pkt->whdr.epoch = htonl(conn->proto.epoch);
162 pkt->whdr.cid = htonl(call->cid);
163 pkt->whdr.callNumber = htonl(call->call_id);
164 pkt->whdr.seq = 0;
165 pkt->whdr.type = RXRPC_PACKET_TYPE_ACK;
166 pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag;
167 pkt->whdr.userStatus = 0;
168 pkt->whdr.securityIndex = call->security_ix;
169 pkt->whdr._rsvd = 0;
170 pkt->whdr.serviceId = htons(call->service_id);
171
172 spin_lock_bh(&call->lock);
173 if (ping) {
174 reason = RXRPC_ACK_PING;
175 } else {
176 reason = call->ackr_reason;
177 if (!call->ackr_reason) {
178 spin_unlock_bh(&call->lock);
179 ret = 0;
180 goto out;
181 }
182 call->ackr_reason = 0;
183 }
184 n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason);
185
186 spin_unlock_bh(&call->lock);
187
188 iov[0].iov_base = pkt;
189 iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n;
190 iov[1].iov_base = &pkt->ackinfo;
191 iov[1].iov_len = sizeof(pkt->ackinfo);
192 len = iov[0].iov_len + iov[1].iov_len;
193
194 serial = atomic_inc_return(&conn->serial);
195 pkt->whdr.serial = htonl(serial);
196 trace_rxrpc_tx_ack(call->debug_id, serial,
197 ntohl(pkt->ack.firstPacket),
198 ntohl(pkt->ack.serial),
199 pkt->ack.reason, pkt->ack.nAcks);
200 if (_serial)
201 *_serial = serial;
202
203 if (ping) {
204 call->ping_serial = serial;
205 smp_wmb();
206 /* We need to stick a time in before we send the packet in case
207 * the reply gets back before kernel_sendmsg() completes - but
208 * asking UDP to send the packet can take a relatively long
209 * time.
210 */
211 call->ping_time = ktime_get_real();
212 set_bit(RXRPC_CALL_PINGING, &call->flags);
213 trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial);
214 }
215
216 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
217 conn->params.peer->last_tx_at = ktime_get_seconds();
218 if (ret < 0)
219 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
220 rxrpc_tx_point_call_ack);
221 else
222 trace_rxrpc_tx_packet(call->debug_id, &pkt->whdr,
223 rxrpc_tx_point_call_ack);
224 rxrpc_tx_backoff(call, ret);
225
226 if (call->state < RXRPC_CALL_COMPLETE) {
227 if (ret < 0) {
228 if (ping)
229 clear_bit(RXRPC_CALL_PINGING, &call->flags);
230 rxrpc_propose_ACK(call, pkt->ack.reason,
231 ntohs(pkt->ack.maxSkew),
232 ntohl(pkt->ack.serial),
233 false, true,
234 rxrpc_propose_ack_retry_tx);
235 } else {
236 spin_lock_bh(&call->lock);
237 if (after(hard_ack, call->ackr_consumed))
238 call->ackr_consumed = hard_ack;
239 if (after(top, call->ackr_seen))
240 call->ackr_seen = top;
241 spin_unlock_bh(&call->lock);
242 }
243
244 rxrpc_set_keepalive(call);
245 }
246
247 out:
248 kfree(pkt);
249 return ret;
250 }
251
252 /*
253 * Send an ABORT call packet.
254 */
rxrpc_send_abort_packet(struct rxrpc_call * call)255 int rxrpc_send_abort_packet(struct rxrpc_call *call)
256 {
257 struct rxrpc_connection *conn;
258 struct rxrpc_abort_buffer pkt;
259 struct msghdr msg;
260 struct kvec iov[1];
261 rxrpc_serial_t serial;
262 int ret;
263
264 /* Don't bother sending aborts for a client call once the server has
265 * hard-ACK'd all of its request data. After that point, we're not
266 * going to stop the operation proceeding, and whilst we might limit
267 * the reply, it's not worth it if we can send a new call on the same
268 * channel instead, thereby closing off this call.
269 */
270 if (rxrpc_is_client_call(call) &&
271 test_bit(RXRPC_CALL_TX_LAST, &call->flags))
272 return 0;
273
274 if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
275 return -ECONNRESET;
276
277 conn = call->conn;
278
279 msg.msg_name = &call->peer->srx.transport;
280 msg.msg_namelen = call->peer->srx.transport_len;
281 msg.msg_control = NULL;
282 msg.msg_controllen = 0;
283 msg.msg_flags = 0;
284
285 pkt.whdr.epoch = htonl(conn->proto.epoch);
286 pkt.whdr.cid = htonl(call->cid);
287 pkt.whdr.callNumber = htonl(call->call_id);
288 pkt.whdr.seq = 0;
289 pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT;
290 pkt.whdr.flags = conn->out_clientflag;
291 pkt.whdr.userStatus = 0;
292 pkt.whdr.securityIndex = call->security_ix;
293 pkt.whdr._rsvd = 0;
294 pkt.whdr.serviceId = htons(call->service_id);
295 pkt.abort_code = htonl(call->abort_code);
296
297 iov[0].iov_base = &pkt;
298 iov[0].iov_len = sizeof(pkt);
299
300 serial = atomic_inc_return(&conn->serial);
301 pkt.whdr.serial = htonl(serial);
302
303 ret = kernel_sendmsg(conn->params.local->socket,
304 &msg, iov, 1, sizeof(pkt));
305 conn->params.peer->last_tx_at = ktime_get_seconds();
306 if (ret < 0)
307 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
308 rxrpc_tx_point_call_abort);
309 else
310 trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr,
311 rxrpc_tx_point_call_abort);
312 rxrpc_tx_backoff(call, ret);
313 return ret;
314 }
315
316 /*
317 * send a packet through the transport endpoint
318 */
rxrpc_send_data_packet(struct rxrpc_call * call,struct sk_buff * skb,bool retrans)319 int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
320 bool retrans)
321 {
322 struct rxrpc_connection *conn = call->conn;
323 struct rxrpc_wire_header whdr;
324 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
325 struct msghdr msg;
326 struct kvec iov[2];
327 rxrpc_serial_t serial;
328 size_t len;
329 bool lost = false;
330 int ret, opt;
331
332 _enter(",{%d}", skb->len);
333
334 /* Each transmission of a Tx packet needs a new serial number */
335 serial = atomic_inc_return(&conn->serial);
336
337 whdr.epoch = htonl(conn->proto.epoch);
338 whdr.cid = htonl(call->cid);
339 whdr.callNumber = htonl(call->call_id);
340 whdr.seq = htonl(sp->hdr.seq);
341 whdr.serial = htonl(serial);
342 whdr.type = RXRPC_PACKET_TYPE_DATA;
343 whdr.flags = sp->hdr.flags;
344 whdr.userStatus = 0;
345 whdr.securityIndex = call->security_ix;
346 whdr._rsvd = htons(sp->hdr._rsvd);
347 whdr.serviceId = htons(call->service_id);
348
349 if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) &&
350 sp->hdr.seq == 1)
351 whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE;
352
353 iov[0].iov_base = &whdr;
354 iov[0].iov_len = sizeof(whdr);
355 iov[1].iov_base = skb->head;
356 iov[1].iov_len = skb->len;
357 len = iov[0].iov_len + iov[1].iov_len;
358
359 msg.msg_name = &call->peer->srx.transport;
360 msg.msg_namelen = call->peer->srx.transport_len;
361 msg.msg_control = NULL;
362 msg.msg_controllen = 0;
363 msg.msg_flags = 0;
364
365 /* If our RTT cache needs working on, request an ACK. Also request
366 * ACKs if a DATA packet appears to have been lost.
367 *
368 * However, we mustn't request an ACK on the last reply packet of a
369 * service call, lest OpenAFS incorrectly send us an ACK with some
370 * soft-ACKs in it and then never follow up with a proper hard ACK.
371 */
372 if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) ||
373 rxrpc_to_server(sp)
374 ) &&
375 (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) ||
376 retrans ||
377 call->cong_mode == RXRPC_CALL_SLOW_START ||
378 (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) ||
379 ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000),
380 ktime_get_real())))
381 whdr.flags |= RXRPC_REQUEST_ACK;
382
383 if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
384 static int lose;
385 if ((lose++ & 7) == 7) {
386 ret = 0;
387 lost = true;
388 goto done;
389 }
390 }
391
392 _proto("Tx DATA %%%u { #%u }", serial, sp->hdr.seq);
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 trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags,
427 retrans, lost);
428 if (ret >= 0) {
429 if (whdr.flags & RXRPC_REQUEST_ACK) {
430 call->peer->rtt_last_req = skb->tstamp;
431 trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial);
432 if (call->peer->rtt_usage > 1) {
433 unsigned long nowj = jiffies, ack_lost_at;
434
435 ack_lost_at = nsecs_to_jiffies(2 * call->peer->rtt);
436 if (ack_lost_at < 1)
437 ack_lost_at = 1;
438
439 ack_lost_at += nowj;
440 WRITE_ONCE(call->ack_lost_at, ack_lost_at);
441 rxrpc_reduce_call_timer(call, ack_lost_at, nowj,
442 rxrpc_timer_set_for_lost_ack);
443 }
444 }
445
446 if (sp->hdr.seq == 1 &&
447 !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER,
448 &call->flags)) {
449 unsigned long nowj = jiffies, expect_rx_by;
450
451 expect_rx_by = nowj + call->next_rx_timo;
452 WRITE_ONCE(call->expect_rx_by, expect_rx_by);
453 rxrpc_reduce_call_timer(call, expect_rx_by, nowj,
454 rxrpc_timer_set_for_normal);
455 }
456
457 rxrpc_set_keepalive(call);
458 } else {
459 /* Cancel the call if the initial transmission fails,
460 * particularly if that's due to network routing issues that
461 * aren't going away anytime soon. The layer above can arrange
462 * the retransmission.
463 */
464 if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags))
465 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
466 RX_USER_ABORT, ret);
467 }
468
469 _leave(" = %d [%u]", ret, call->peer->maxdata);
470 return ret;
471
472 send_fragmentable:
473 /* attempt to send this message with fragmentation enabled */
474 _debug("send fragment");
475
476 down_write(&conn->params.local->defrag_sem);
477
478 sp->hdr.serial = serial;
479 smp_wmb(); /* Set serial before timestamp */
480 skb->tstamp = ktime_get_real();
481
482 switch (conn->params.local->srx.transport.family) {
483 case AF_INET6:
484 case AF_INET:
485 opt = IP_PMTUDISC_DONT;
486 kernel_setsockopt(conn->params.local->socket,
487 SOL_IP, IP_MTU_DISCOVER,
488 (char *)&opt, sizeof(opt));
489 ret = kernel_sendmsg(conn->params.local->socket, &msg,
490 iov, 2, len);
491 conn->params.peer->last_tx_at = ktime_get_seconds();
492
493 opt = IP_PMTUDISC_DO;
494 kernel_setsockopt(conn->params.local->socket,
495 SOL_IP, IP_MTU_DISCOVER,
496 (char *)&opt, sizeof(opt));
497 break;
498
499 default:
500 BUG();
501 }
502
503 if (ret < 0)
504 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
505 rxrpc_tx_point_call_data_frag);
506 else
507 trace_rxrpc_tx_packet(call->debug_id, &whdr,
508 rxrpc_tx_point_call_data_frag);
509 rxrpc_tx_backoff(call, ret);
510
511 up_write(&conn->params.local->defrag_sem);
512 goto done;
513 }
514
515 /*
516 * reject packets through the local endpoint
517 */
rxrpc_reject_packets(struct rxrpc_local * local)518 void rxrpc_reject_packets(struct rxrpc_local *local)
519 {
520 struct sockaddr_rxrpc srx;
521 struct rxrpc_skb_priv *sp;
522 struct rxrpc_wire_header whdr;
523 struct sk_buff *skb;
524 struct msghdr msg;
525 struct kvec iov[2];
526 size_t size;
527 __be32 code;
528 int ret, ioc;
529
530 _enter("%d", local->debug_id);
531
532 iov[0].iov_base = &whdr;
533 iov[0].iov_len = sizeof(whdr);
534 iov[1].iov_base = &code;
535 iov[1].iov_len = sizeof(code);
536
537 msg.msg_name = &srx.transport;
538 msg.msg_control = NULL;
539 msg.msg_controllen = 0;
540 msg.msg_flags = 0;
541
542 memset(&whdr, 0, sizeof(whdr));
543
544 while ((skb = skb_dequeue(&local->reject_queue))) {
545 rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
546 sp = rxrpc_skb(skb);
547
548 switch (skb->mark) {
549 case RXRPC_SKB_MARK_REJECT_BUSY:
550 whdr.type = RXRPC_PACKET_TYPE_BUSY;
551 size = sizeof(whdr);
552 ioc = 1;
553 break;
554 case RXRPC_SKB_MARK_REJECT_ABORT:
555 whdr.type = RXRPC_PACKET_TYPE_ABORT;
556 code = htonl(skb->priority);
557 size = sizeof(whdr) + sizeof(code);
558 ioc = 2;
559 break;
560 default:
561 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
562 continue;
563 }
564
565 if (rxrpc_extract_addr_from_skb(local, &srx, skb) == 0) {
566 msg.msg_namelen = srx.transport_len;
567
568 whdr.epoch = htonl(sp->hdr.epoch);
569 whdr.cid = htonl(sp->hdr.cid);
570 whdr.callNumber = htonl(sp->hdr.callNumber);
571 whdr.serviceId = htons(sp->hdr.serviceId);
572 whdr.flags = sp->hdr.flags;
573 whdr.flags ^= RXRPC_CLIENT_INITIATED;
574 whdr.flags &= RXRPC_CLIENT_INITIATED;
575
576 ret = kernel_sendmsg(local->socket, &msg,
577 iov, ioc, size);
578 if (ret < 0)
579 trace_rxrpc_tx_fail(local->debug_id, 0, ret,
580 rxrpc_tx_point_reject);
581 else
582 trace_rxrpc_tx_packet(local->debug_id, &whdr,
583 rxrpc_tx_point_reject);
584 }
585
586 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
587 }
588
589 _leave("");
590 }
591
592 /*
593 * Send a VERSION reply to a peer as a keepalive.
594 */
rxrpc_send_keepalive(struct rxrpc_peer * peer)595 void rxrpc_send_keepalive(struct rxrpc_peer *peer)
596 {
597 struct rxrpc_wire_header whdr;
598 struct msghdr msg;
599 struct kvec iov[2];
600 size_t len;
601 int ret;
602
603 _enter("");
604
605 msg.msg_name = &peer->srx.transport;
606 msg.msg_namelen = peer->srx.transport_len;
607 msg.msg_control = NULL;
608 msg.msg_controllen = 0;
609 msg.msg_flags = 0;
610
611 whdr.epoch = htonl(peer->local->rxnet->epoch);
612 whdr.cid = 0;
613 whdr.callNumber = 0;
614 whdr.seq = 0;
615 whdr.serial = 0;
616 whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */
617 whdr.flags = RXRPC_LAST_PACKET;
618 whdr.userStatus = 0;
619 whdr.securityIndex = 0;
620 whdr._rsvd = 0;
621 whdr.serviceId = 0;
622
623 iov[0].iov_base = &whdr;
624 iov[0].iov_len = sizeof(whdr);
625 iov[1].iov_base = (char *)rxrpc_keepalive_string;
626 iov[1].iov_len = sizeof(rxrpc_keepalive_string);
627
628 len = iov[0].iov_len + iov[1].iov_len;
629
630 _proto("Tx VERSION (keepalive)");
631
632 ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len);
633 if (ret < 0)
634 trace_rxrpc_tx_fail(peer->debug_id, 0, ret,
635 rxrpc_tx_point_version_keepalive);
636 else
637 trace_rxrpc_tx_packet(peer->debug_id, &whdr,
638 rxrpc_tx_point_version_keepalive);
639
640 peer->last_tx_at = ktime_get_seconds();
641 _leave("");
642 }
643