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 rxrpc_seq_t hard_ack, top, seq;
78 int ix;
79 u32 mtu, jmax;
80 u8 *ackp = pkt->acks;
81
82 /* Barrier against rxrpc_input_data(). */
83 serial = call->ackr_serial;
84 hard_ack = READ_ONCE(call->rx_hard_ack);
85 top = smp_load_acquire(&call->rx_top);
86 *_hard_ack = hard_ack;
87 *_top = top;
88
89 pkt->ack.bufferSpace = htons(8);
90 pkt->ack.maxSkew = htons(0);
91 pkt->ack.firstPacket = htonl(hard_ack + 1);
92 pkt->ack.previousPacket = htonl(call->ackr_prev_seq);
93 pkt->ack.serial = htonl(serial);
94 pkt->ack.reason = reason;
95 pkt->ack.nAcks = top - hard_ack;
96
97 if (reason == RXRPC_ACK_PING)
98 pkt->whdr.flags |= RXRPC_REQUEST_ACK;
99
100 if (after(top, hard_ack)) {
101 seq = hard_ack + 1;
102 do {
103 ix = seq & RXRPC_RXTX_BUFF_MASK;
104 if (call->rxtx_buffer[ix])
105 *ackp++ = RXRPC_ACK_TYPE_ACK;
106 else
107 *ackp++ = RXRPC_ACK_TYPE_NACK;
108 seq++;
109 } while (before_eq(seq, top));
110 }
111
112 mtu = conn->params.peer->if_mtu;
113 mtu -= conn->params.peer->hdrsize;
114 jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
115 pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
116 pkt->ackinfo.maxMTU = htonl(mtu);
117 pkt->ackinfo.rwind = htonl(call->rx_winsize);
118 pkt->ackinfo.jumbo_max = htonl(jmax);
119
120 *ackp++ = 0;
121 *ackp++ = 0;
122 *ackp++ = 0;
123 return top - hard_ack + 3;
124 }
125
126 /*
127 * Record the beginning of an RTT probe.
128 */
rxrpc_begin_rtt_probe(struct rxrpc_call * call,rxrpc_serial_t serial,enum rxrpc_rtt_tx_trace why)129 static int rxrpc_begin_rtt_probe(struct rxrpc_call *call, rxrpc_serial_t serial,
130 enum rxrpc_rtt_tx_trace why)
131 {
132 unsigned long avail = call->rtt_avail;
133 int rtt_slot = 9;
134
135 if (!(avail & RXRPC_CALL_RTT_AVAIL_MASK))
136 goto no_slot;
137
138 rtt_slot = __ffs(avail & RXRPC_CALL_RTT_AVAIL_MASK);
139 if (!test_and_clear_bit(rtt_slot, &call->rtt_avail))
140 goto no_slot;
141
142 call->rtt_serial[rtt_slot] = serial;
143 call->rtt_sent_at[rtt_slot] = ktime_get_real();
144 smp_wmb(); /* Write data before avail bit */
145 set_bit(rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail);
146
147 trace_rxrpc_rtt_tx(call, why, rtt_slot, serial);
148 return rtt_slot;
149
150 no_slot:
151 trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_no_slot, rtt_slot, serial);
152 return -1;
153 }
154
155 /*
156 * Cancel an RTT probe.
157 */
rxrpc_cancel_rtt_probe(struct rxrpc_call * call,rxrpc_serial_t serial,int rtt_slot)158 static void rxrpc_cancel_rtt_probe(struct rxrpc_call *call,
159 rxrpc_serial_t serial, int rtt_slot)
160 {
161 if (rtt_slot != -1) {
162 clear_bit(rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail);
163 smp_wmb(); /* Clear pending bit before setting slot */
164 set_bit(rtt_slot, &call->rtt_avail);
165 trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_cancel, rtt_slot, serial);
166 }
167 }
168
169 /*
170 * Send an ACK call packet.
171 */
rxrpc_send_ack_packet(struct rxrpc_call * call,bool ping,rxrpc_serial_t * _serial)172 int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping,
173 rxrpc_serial_t *_serial)
174 {
175 struct rxrpc_connection *conn;
176 struct rxrpc_ack_buffer *pkt;
177 struct msghdr msg;
178 struct kvec iov[2];
179 rxrpc_serial_t serial;
180 rxrpc_seq_t hard_ack, top;
181 size_t len, n;
182 int ret, rtt_slot = -1;
183 u8 reason;
184
185 if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
186 return -ECONNRESET;
187
188 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
189 if (!pkt)
190 return -ENOMEM;
191
192 conn = call->conn;
193
194 msg.msg_name = &call->peer->srx.transport;
195 msg.msg_namelen = call->peer->srx.transport_len;
196 msg.msg_control = NULL;
197 msg.msg_controllen = 0;
198 msg.msg_flags = 0;
199
200 pkt->whdr.epoch = htonl(conn->proto.epoch);
201 pkt->whdr.cid = htonl(call->cid);
202 pkt->whdr.callNumber = htonl(call->call_id);
203 pkt->whdr.seq = 0;
204 pkt->whdr.type = RXRPC_PACKET_TYPE_ACK;
205 pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag;
206 pkt->whdr.userStatus = 0;
207 pkt->whdr.securityIndex = call->security_ix;
208 pkt->whdr._rsvd = 0;
209 pkt->whdr.serviceId = htons(call->service_id);
210
211 spin_lock_bh(&call->lock);
212 if (ping) {
213 reason = RXRPC_ACK_PING;
214 } else {
215 reason = call->ackr_reason;
216 if (!call->ackr_reason) {
217 spin_unlock_bh(&call->lock);
218 ret = 0;
219 goto out;
220 }
221 call->ackr_reason = 0;
222 }
223 n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason);
224
225 spin_unlock_bh(&call->lock);
226
227 iov[0].iov_base = pkt;
228 iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n;
229 iov[1].iov_base = &pkt->ackinfo;
230 iov[1].iov_len = sizeof(pkt->ackinfo);
231 len = iov[0].iov_len + iov[1].iov_len;
232
233 serial = atomic_inc_return(&conn->serial);
234 pkt->whdr.serial = htonl(serial);
235 trace_rxrpc_tx_ack(call->debug_id, serial,
236 ntohl(pkt->ack.firstPacket),
237 ntohl(pkt->ack.serial),
238 pkt->ack.reason, pkt->ack.nAcks);
239 if (_serial)
240 *_serial = serial;
241
242 if (ping)
243 rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_ping);
244
245 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
246 conn->params.peer->last_tx_at = ktime_get_seconds();
247 if (ret < 0)
248 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
249 rxrpc_tx_point_call_ack);
250 else
251 trace_rxrpc_tx_packet(call->debug_id, &pkt->whdr,
252 rxrpc_tx_point_call_ack);
253 rxrpc_tx_backoff(call, ret);
254
255 if (call->state < RXRPC_CALL_COMPLETE) {
256 if (ret < 0) {
257 rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
258 rxrpc_propose_ACK(call, pkt->ack.reason,
259 ntohl(pkt->ack.serial),
260 false, true,
261 rxrpc_propose_ack_retry_tx);
262 } else {
263 spin_lock_bh(&call->lock);
264 if (after(hard_ack, call->ackr_consumed))
265 call->ackr_consumed = hard_ack;
266 if (after(top, call->ackr_seen))
267 call->ackr_seen = top;
268 spin_unlock_bh(&call->lock);
269 }
270
271 rxrpc_set_keepalive(call);
272 }
273
274 out:
275 kfree(pkt);
276 return ret;
277 }
278
279 /*
280 * Send an ABORT call packet.
281 */
rxrpc_send_abort_packet(struct rxrpc_call * call)282 int rxrpc_send_abort_packet(struct rxrpc_call *call)
283 {
284 struct rxrpc_connection *conn;
285 struct rxrpc_abort_buffer pkt;
286 struct msghdr msg;
287 struct kvec iov[1];
288 rxrpc_serial_t serial;
289 int ret;
290
291 /* Don't bother sending aborts for a client call once the server has
292 * hard-ACK'd all of its request data. After that point, we're not
293 * going to stop the operation proceeding, and whilst we might limit
294 * the reply, it's not worth it if we can send a new call on the same
295 * channel instead, thereby closing off this call.
296 */
297 if (rxrpc_is_client_call(call) &&
298 test_bit(RXRPC_CALL_TX_LAST, &call->flags))
299 return 0;
300
301 if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
302 return -ECONNRESET;
303
304 conn = call->conn;
305
306 msg.msg_name = &call->peer->srx.transport;
307 msg.msg_namelen = call->peer->srx.transport_len;
308 msg.msg_control = NULL;
309 msg.msg_controllen = 0;
310 msg.msg_flags = 0;
311
312 pkt.whdr.epoch = htonl(conn->proto.epoch);
313 pkt.whdr.cid = htonl(call->cid);
314 pkt.whdr.callNumber = htonl(call->call_id);
315 pkt.whdr.seq = 0;
316 pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT;
317 pkt.whdr.flags = conn->out_clientflag;
318 pkt.whdr.userStatus = 0;
319 pkt.whdr.securityIndex = call->security_ix;
320 pkt.whdr._rsvd = 0;
321 pkt.whdr.serviceId = htons(call->service_id);
322 pkt.abort_code = htonl(call->abort_code);
323
324 iov[0].iov_base = &pkt;
325 iov[0].iov_len = sizeof(pkt);
326
327 serial = atomic_inc_return(&conn->serial);
328 pkt.whdr.serial = htonl(serial);
329
330 ret = kernel_sendmsg(conn->params.local->socket,
331 &msg, iov, 1, sizeof(pkt));
332 conn->params.peer->last_tx_at = ktime_get_seconds();
333 if (ret < 0)
334 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
335 rxrpc_tx_point_call_abort);
336 else
337 trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr,
338 rxrpc_tx_point_call_abort);
339 rxrpc_tx_backoff(call, ret);
340 return ret;
341 }
342
343 /*
344 * send a packet through the transport endpoint
345 */
rxrpc_send_data_packet(struct rxrpc_call * call,struct sk_buff * skb,bool retrans)346 int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
347 bool retrans)
348 {
349 struct rxrpc_connection *conn = call->conn;
350 struct rxrpc_wire_header whdr;
351 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
352 struct msghdr msg;
353 struct kvec iov[2];
354 rxrpc_serial_t serial;
355 size_t len;
356 int ret, rtt_slot = -1;
357
358 _enter(",{%d}", skb->len);
359
360 if (hlist_unhashed(&call->error_link)) {
361 spin_lock_bh(&call->peer->lock);
362 hlist_add_head_rcu(&call->error_link, &call->peer->error_targets);
363 spin_unlock_bh(&call->peer->lock);
364 }
365
366 /* Each transmission of a Tx packet needs a new serial number */
367 serial = atomic_inc_return(&conn->serial);
368
369 whdr.epoch = htonl(conn->proto.epoch);
370 whdr.cid = htonl(call->cid);
371 whdr.callNumber = htonl(call->call_id);
372 whdr.seq = htonl(sp->hdr.seq);
373 whdr.serial = htonl(serial);
374 whdr.type = RXRPC_PACKET_TYPE_DATA;
375 whdr.flags = sp->hdr.flags;
376 whdr.userStatus = 0;
377 whdr.securityIndex = call->security_ix;
378 whdr._rsvd = htons(sp->hdr._rsvd);
379 whdr.serviceId = htons(call->service_id);
380
381 if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) &&
382 sp->hdr.seq == 1)
383 whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE;
384
385 iov[0].iov_base = &whdr;
386 iov[0].iov_len = sizeof(whdr);
387 iov[1].iov_base = skb->head;
388 iov[1].iov_len = skb->len;
389 len = iov[0].iov_len + iov[1].iov_len;
390
391 msg.msg_name = &call->peer->srx.transport;
392 msg.msg_namelen = call->peer->srx.transport_len;
393 msg.msg_control = NULL;
394 msg.msg_controllen = 0;
395 msg.msg_flags = 0;
396
397 /* If our RTT cache needs working on, request an ACK. Also request
398 * ACKs if a DATA packet appears to have been lost.
399 *
400 * However, we mustn't request an ACK on the last reply packet of a
401 * service call, lest OpenAFS incorrectly send us an ACK with some
402 * soft-ACKs in it and then never follow up with a proper hard ACK.
403 */
404 if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) ||
405 rxrpc_to_server(sp)
406 ) &&
407 (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) ||
408 retrans ||
409 call->cong_mode == RXRPC_CALL_SLOW_START ||
410 (call->peer->rtt_count < 3 && sp->hdr.seq & 1) ||
411 ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000),
412 ktime_get_real())))
413 whdr.flags |= RXRPC_REQUEST_ACK;
414
415 if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
416 static int lose;
417 if ((lose++ & 7) == 7) {
418 ret = 0;
419 trace_rxrpc_tx_data(call, sp->hdr.seq, serial,
420 whdr.flags, retrans, true);
421 goto done;
422 }
423 }
424
425 trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, retrans,
426 false);
427
428 /* send the packet with the don't fragment bit set if we currently
429 * think it's small enough */
430 if (iov[1].iov_len >= call->peer->maxdata)
431 goto send_fragmentable;
432
433 down_read(&conn->params.local->defrag_sem);
434
435 sp->hdr.serial = serial;
436 smp_wmb(); /* Set serial before timestamp */
437 skb->tstamp = ktime_get_real();
438 if (whdr.flags & RXRPC_REQUEST_ACK)
439 rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data);
440
441 /* send the packet by UDP
442 * - returns -EMSGSIZE if UDP would have to fragment the packet
443 * to go out of the interface
444 * - in which case, we'll have processed the ICMP error
445 * message and update the peer record
446 */
447 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
448 conn->params.peer->last_tx_at = ktime_get_seconds();
449
450 up_read(&conn->params.local->defrag_sem);
451 if (ret < 0) {
452 rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
453 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
454 rxrpc_tx_point_call_data_nofrag);
455 } else {
456 trace_rxrpc_tx_packet(call->debug_id, &whdr,
457 rxrpc_tx_point_call_data_nofrag);
458 }
459
460 rxrpc_tx_backoff(call, ret);
461 if (ret == -EMSGSIZE)
462 goto send_fragmentable;
463
464 done:
465 if (ret >= 0) {
466 if (whdr.flags & RXRPC_REQUEST_ACK) {
467 call->peer->rtt_last_req = skb->tstamp;
468 if (call->peer->rtt_count > 1) {
469 unsigned long nowj = jiffies, ack_lost_at;
470
471 ack_lost_at = rxrpc_get_rto_backoff(call->peer, retrans);
472 ack_lost_at += nowj;
473 WRITE_ONCE(call->ack_lost_at, ack_lost_at);
474 rxrpc_reduce_call_timer(call, ack_lost_at, nowj,
475 rxrpc_timer_set_for_lost_ack);
476 }
477 }
478
479 if (sp->hdr.seq == 1 &&
480 !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER,
481 &call->flags)) {
482 unsigned long nowj = jiffies, expect_rx_by;
483
484 expect_rx_by = nowj + call->next_rx_timo;
485 WRITE_ONCE(call->expect_rx_by, expect_rx_by);
486 rxrpc_reduce_call_timer(call, expect_rx_by, nowj,
487 rxrpc_timer_set_for_normal);
488 }
489
490 rxrpc_set_keepalive(call);
491 } else {
492 /* Cancel the call if the initial transmission fails,
493 * particularly if that's due to network routing issues that
494 * aren't going away anytime soon. The layer above can arrange
495 * the retransmission.
496 */
497 if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags))
498 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
499 RX_USER_ABORT, ret);
500 }
501
502 _leave(" = %d [%u]", ret, call->peer->maxdata);
503 return ret;
504
505 send_fragmentable:
506 /* attempt to send this message with fragmentation enabled */
507 _debug("send fragment");
508
509 down_write(&conn->params.local->defrag_sem);
510
511 sp->hdr.serial = serial;
512 smp_wmb(); /* Set serial before timestamp */
513 skb->tstamp = ktime_get_real();
514 if (whdr.flags & RXRPC_REQUEST_ACK)
515 rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data);
516
517 switch (conn->params.local->srx.transport.family) {
518 case AF_INET6:
519 case AF_INET:
520 ip_sock_set_mtu_discover(conn->params.local->socket->sk,
521 IP_PMTUDISC_DONT);
522 ret = kernel_sendmsg(conn->params.local->socket, &msg,
523 iov, 2, len);
524 conn->params.peer->last_tx_at = ktime_get_seconds();
525
526 ip_sock_set_mtu_discover(conn->params.local->socket->sk,
527 IP_PMTUDISC_DO);
528 break;
529
530 default:
531 BUG();
532 }
533
534 if (ret < 0) {
535 rxrpc_cancel_rtt_probe(call, serial, rtt_slot);
536 trace_rxrpc_tx_fail(call->debug_id, serial, ret,
537 rxrpc_tx_point_call_data_frag);
538 } else {
539 trace_rxrpc_tx_packet(call->debug_id, &whdr,
540 rxrpc_tx_point_call_data_frag);
541 }
542 rxrpc_tx_backoff(call, ret);
543
544 up_write(&conn->params.local->defrag_sem);
545 goto done;
546 }
547
548 /*
549 * reject packets through the local endpoint
550 */
rxrpc_reject_packets(struct rxrpc_local * local)551 void rxrpc_reject_packets(struct rxrpc_local *local)
552 {
553 struct sockaddr_rxrpc srx;
554 struct rxrpc_skb_priv *sp;
555 struct rxrpc_wire_header whdr;
556 struct sk_buff *skb;
557 struct msghdr msg;
558 struct kvec iov[2];
559 size_t size;
560 __be32 code;
561 int ret, ioc;
562
563 _enter("%d", local->debug_id);
564
565 iov[0].iov_base = &whdr;
566 iov[0].iov_len = sizeof(whdr);
567 iov[1].iov_base = &code;
568 iov[1].iov_len = sizeof(code);
569
570 msg.msg_name = &srx.transport;
571 msg.msg_control = NULL;
572 msg.msg_controllen = 0;
573 msg.msg_flags = 0;
574
575 memset(&whdr, 0, sizeof(whdr));
576
577 while ((skb = skb_dequeue(&local->reject_queue))) {
578 rxrpc_see_skb(skb, rxrpc_skb_seen);
579 sp = rxrpc_skb(skb);
580
581 switch (skb->mark) {
582 case RXRPC_SKB_MARK_REJECT_BUSY:
583 whdr.type = RXRPC_PACKET_TYPE_BUSY;
584 size = sizeof(whdr);
585 ioc = 1;
586 break;
587 case RXRPC_SKB_MARK_REJECT_ABORT:
588 whdr.type = RXRPC_PACKET_TYPE_ABORT;
589 code = htonl(skb->priority);
590 size = sizeof(whdr) + sizeof(code);
591 ioc = 2;
592 break;
593 default:
594 rxrpc_free_skb(skb, rxrpc_skb_freed);
595 continue;
596 }
597
598 if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) {
599 msg.msg_namelen = srx.transport_len;
600
601 whdr.epoch = htonl(sp->hdr.epoch);
602 whdr.cid = htonl(sp->hdr.cid);
603 whdr.callNumber = htonl(sp->hdr.callNumber);
604 whdr.serviceId = htons(sp->hdr.serviceId);
605 whdr.flags = sp->hdr.flags;
606 whdr.flags ^= RXRPC_CLIENT_INITIATED;
607 whdr.flags &= RXRPC_CLIENT_INITIATED;
608
609 ret = kernel_sendmsg(local->socket, &msg,
610 iov, ioc, size);
611 if (ret < 0)
612 trace_rxrpc_tx_fail(local->debug_id, 0, ret,
613 rxrpc_tx_point_reject);
614 else
615 trace_rxrpc_tx_packet(local->debug_id, &whdr,
616 rxrpc_tx_point_reject);
617 }
618
619 rxrpc_free_skb(skb, rxrpc_skb_freed);
620 }
621
622 _leave("");
623 }
624
625 /*
626 * Send a VERSION reply to a peer as a keepalive.
627 */
rxrpc_send_keepalive(struct rxrpc_peer * peer)628 void rxrpc_send_keepalive(struct rxrpc_peer *peer)
629 {
630 struct rxrpc_wire_header whdr;
631 struct msghdr msg;
632 struct kvec iov[2];
633 size_t len;
634 int ret;
635
636 _enter("");
637
638 msg.msg_name = &peer->srx.transport;
639 msg.msg_namelen = peer->srx.transport_len;
640 msg.msg_control = NULL;
641 msg.msg_controllen = 0;
642 msg.msg_flags = 0;
643
644 whdr.epoch = htonl(peer->local->rxnet->epoch);
645 whdr.cid = 0;
646 whdr.callNumber = 0;
647 whdr.seq = 0;
648 whdr.serial = 0;
649 whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */
650 whdr.flags = RXRPC_LAST_PACKET;
651 whdr.userStatus = 0;
652 whdr.securityIndex = 0;
653 whdr._rsvd = 0;
654 whdr.serviceId = 0;
655
656 iov[0].iov_base = &whdr;
657 iov[0].iov_len = sizeof(whdr);
658 iov[1].iov_base = (char *)rxrpc_keepalive_string;
659 iov[1].iov_len = sizeof(rxrpc_keepalive_string);
660
661 len = iov[0].iov_len + iov[1].iov_len;
662
663 _proto("Tx VERSION (keepalive)");
664
665 ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len);
666 if (ret < 0)
667 trace_rxrpc_tx_fail(peer->debug_id, 0, ret,
668 rxrpc_tx_point_version_keepalive);
669 else
670 trace_rxrpc_tx_packet(peer->debug_id, &whdr,
671 rxrpc_tx_point_version_keepalive);
672
673 peer->last_tx_at = ktime_get_seconds();
674 _leave("");
675 }
676
