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 */ 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 */ 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 */ 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(call->ackr_skew); 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 * Send an ACK call packet. 128 */ 129 int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping, 130 rxrpc_serial_t *_serial) 131 { 132 struct rxrpc_connection *conn = NULL; 133 struct rxrpc_ack_buffer *pkt; 134 struct msghdr msg; 135 struct kvec iov[2]; 136 rxrpc_serial_t serial; 137 rxrpc_seq_t hard_ack, top; 138 size_t len, n; 139 int ret; 140 u8 reason; 141 142 spin_lock_bh(&call->lock); 143 if (call->conn) 144 conn = rxrpc_get_connection_maybe(call->conn); 145 spin_unlock_bh(&call->lock); 146 if (!conn) 147 return -ECONNRESET; 148 149 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 150 if (!pkt) { 151 rxrpc_put_connection(conn); 152 return -ENOMEM; 153 } 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 rxrpc_put_connection(conn); 249 kfree(pkt); 250 return ret; 251 } 252 253 /* 254 * Send an ABORT call packet. 255 */ 256 int rxrpc_send_abort_packet(struct rxrpc_call *call) 257 { 258 struct rxrpc_connection *conn = NULL; 259 struct rxrpc_abort_buffer pkt; 260 struct msghdr msg; 261 struct kvec iov[1]; 262 rxrpc_serial_t serial; 263 int ret; 264 265 /* Don't bother sending aborts for a client call once the server has 266 * hard-ACK'd all of its request data. After that point, we're not 267 * going to stop the operation proceeding, and whilst we might limit 268 * the reply, it's not worth it if we can send a new call on the same 269 * channel instead, thereby closing off this call. 270 */ 271 if (rxrpc_is_client_call(call) && 272 test_bit(RXRPC_CALL_TX_LAST, &call->flags)) 273 return 0; 274 275 spin_lock_bh(&call->lock); 276 if (call->conn) 277 conn = rxrpc_get_connection_maybe(call->conn); 278 spin_unlock_bh(&call->lock); 279 if (!conn) 280 return -ECONNRESET; 281 282 msg.msg_name = &call->peer->srx.transport; 283 msg.msg_namelen = call->peer->srx.transport_len; 284 msg.msg_control = NULL; 285 msg.msg_controllen = 0; 286 msg.msg_flags = 0; 287 288 pkt.whdr.epoch = htonl(conn->proto.epoch); 289 pkt.whdr.cid = htonl(call->cid); 290 pkt.whdr.callNumber = htonl(call->call_id); 291 pkt.whdr.seq = 0; 292 pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT; 293 pkt.whdr.flags = conn->out_clientflag; 294 pkt.whdr.userStatus = 0; 295 pkt.whdr.securityIndex = call->security_ix; 296 pkt.whdr._rsvd = 0; 297 pkt.whdr.serviceId = htons(call->service_id); 298 pkt.abort_code = htonl(call->abort_code); 299 300 iov[0].iov_base = &pkt; 301 iov[0].iov_len = sizeof(pkt); 302 303 serial = atomic_inc_return(&conn->serial); 304 pkt.whdr.serial = htonl(serial); 305 306 ret = kernel_sendmsg(conn->params.local->socket, 307 &msg, iov, 1, sizeof(pkt)); 308 conn->params.peer->last_tx_at = ktime_get_seconds(); 309 if (ret < 0) 310 trace_rxrpc_tx_fail(call->debug_id, serial, ret, 311 rxrpc_tx_point_call_abort); 312 else 313 trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr, 314 rxrpc_tx_point_call_abort); 315 rxrpc_tx_backoff(call, ret); 316 317 rxrpc_put_connection(conn); 318 return ret; 319 } 320 321 /* 322 * send a packet through the transport endpoint 323 */ 324 int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb, 325 bool retrans) 326 { 327 struct rxrpc_connection *conn = call->conn; 328 struct rxrpc_wire_header whdr; 329 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 330 struct msghdr msg; 331 struct kvec iov[2]; 332 rxrpc_serial_t serial; 333 size_t len; 334 int ret, opt; 335 336 _enter(",{%d}", skb->len); 337 338 /* Each transmission of a Tx packet needs a new serial number */ 339 serial = atomic_inc_return(&conn->serial); 340 341 whdr.epoch = htonl(conn->proto.epoch); 342 whdr.cid = htonl(call->cid); 343 whdr.callNumber = htonl(call->call_id); 344 whdr.seq = htonl(sp->hdr.seq); 345 whdr.serial = htonl(serial); 346 whdr.type = RXRPC_PACKET_TYPE_DATA; 347 whdr.flags = sp->hdr.flags; 348 whdr.userStatus = 0; 349 whdr.securityIndex = call->security_ix; 350 whdr._rsvd = htons(sp->hdr._rsvd); 351 whdr.serviceId = htons(call->service_id); 352 353 if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) && 354 sp->hdr.seq == 1) 355 whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE; 356 357 iov[0].iov_base = &whdr; 358 iov[0].iov_len = sizeof(whdr); 359 iov[1].iov_base = skb->head; 360 iov[1].iov_len = skb->len; 361 len = iov[0].iov_len + iov[1].iov_len; 362 363 msg.msg_name = &call->peer->srx.transport; 364 msg.msg_namelen = call->peer->srx.transport_len; 365 msg.msg_control = NULL; 366 msg.msg_controllen = 0; 367 msg.msg_flags = 0; 368 369 /* If our RTT cache needs working on, request an ACK. Also request 370 * ACKs if a DATA packet appears to have been lost. 371 * 372 * However, we mustn't request an ACK on the last reply packet of a 373 * service call, lest OpenAFS incorrectly send us an ACK with some 374 * soft-ACKs in it and then never follow up with a proper hard ACK. 375 */ 376 if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) || 377 rxrpc_to_server(sp) 378 ) && 379 (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) || 380 retrans || 381 call->cong_mode == RXRPC_CALL_SLOW_START || 382 (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) || 383 ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), 384 ktime_get_real()))) 385 whdr.flags |= RXRPC_REQUEST_ACK; 386 387 if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { 388 static int lose; 389 if ((lose++ & 7) == 7) { 390 ret = 0; 391 trace_rxrpc_tx_data(call, sp->hdr.seq, serial, 392 whdr.flags, retrans, true); 393 goto done; 394 } 395 } 396 397 trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, retrans, 398 false); 399 400 /* send the packet with the don't fragment bit set if we currently 401 * think it's small enough */ 402 if (iov[1].iov_len >= call->peer->maxdata) 403 goto send_fragmentable; 404 405 down_read(&conn->params.local->defrag_sem); 406 407 sp->hdr.serial = serial; 408 smp_wmb(); /* Set serial before timestamp */ 409 skb->tstamp = ktime_get_real(); 410 411 /* send the packet by UDP 412 * - returns -EMSGSIZE if UDP would have to fragment the packet 413 * to go out of the interface 414 * - in which case, we'll have processed the ICMP error 415 * message and update the peer record 416 */ 417 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); 418 conn->params.peer->last_tx_at = ktime_get_seconds(); 419 420 up_read(&conn->params.local->defrag_sem); 421 if (ret < 0) 422 trace_rxrpc_tx_fail(call->debug_id, serial, ret, 423 rxrpc_tx_point_call_data_nofrag); 424 else 425 trace_rxrpc_tx_packet(call->debug_id, &whdr, 426 rxrpc_tx_point_call_data_nofrag); 427 rxrpc_tx_backoff(call, ret); 428 if (ret == -EMSGSIZE) 429 goto send_fragmentable; 430 431 done: 432 if (ret >= 0) { 433 if (whdr.flags & RXRPC_REQUEST_ACK) { 434 call->peer->rtt_last_req = skb->tstamp; 435 trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial); 436 if (call->peer->rtt_usage > 1) { 437 unsigned long nowj = jiffies, ack_lost_at; 438 439 ack_lost_at = nsecs_to_jiffies(2 * call->peer->rtt); 440 if (ack_lost_at < 1) 441 ack_lost_at = 1; 442 443 ack_lost_at += nowj; 444 WRITE_ONCE(call->ack_lost_at, ack_lost_at); 445 rxrpc_reduce_call_timer(call, ack_lost_at, nowj, 446 rxrpc_timer_set_for_lost_ack); 447 } 448 } 449 450 if (sp->hdr.seq == 1 && 451 !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, 452 &call->flags)) { 453 unsigned long nowj = jiffies, expect_rx_by; 454 455 expect_rx_by = nowj + call->next_rx_timo; 456 WRITE_ONCE(call->expect_rx_by, expect_rx_by); 457 rxrpc_reduce_call_timer(call, expect_rx_by, nowj, 458 rxrpc_timer_set_for_normal); 459 } 460 461 rxrpc_set_keepalive(call); 462 } else { 463 /* Cancel the call if the initial transmission fails, 464 * particularly if that's due to network routing issues that 465 * aren't going away anytime soon. The layer above can arrange 466 * the retransmission. 467 */ 468 if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags)) 469 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 470 RX_USER_ABORT, ret); 471 } 472 473 _leave(" = %d [%u]", ret, call->peer->maxdata); 474 return ret; 475 476 send_fragmentable: 477 /* attempt to send this message with fragmentation enabled */ 478 _debug("send fragment"); 479 480 down_write(&conn->params.local->defrag_sem); 481 482 sp->hdr.serial = serial; 483 smp_wmb(); /* Set serial before timestamp */ 484 skb->tstamp = ktime_get_real(); 485 486 switch (conn->params.local->srx.transport.family) { 487 case AF_INET: 488 opt = IP_PMTUDISC_DONT; 489 ret = kernel_setsockopt(conn->params.local->socket, 490 SOL_IP, IP_MTU_DISCOVER, 491 (char *)&opt, sizeof(opt)); 492 if (ret == 0) { 493 ret = kernel_sendmsg(conn->params.local->socket, &msg, 494 iov, 2, len); 495 conn->params.peer->last_tx_at = ktime_get_seconds(); 496 497 opt = IP_PMTUDISC_DO; 498 kernel_setsockopt(conn->params.local->socket, SOL_IP, 499 IP_MTU_DISCOVER, 500 (char *)&opt, sizeof(opt)); 501 } 502 break; 503 504 #ifdef CONFIG_AF_RXRPC_IPV6 505 case AF_INET6: 506 opt = IPV6_PMTUDISC_DONT; 507 ret = kernel_setsockopt(conn->params.local->socket, 508 SOL_IPV6, IPV6_MTU_DISCOVER, 509 (char *)&opt, sizeof(opt)); 510 if (ret == 0) { 511 ret = kernel_sendmsg(conn->params.local->socket, &msg, 512 iov, 2, len); 513 conn->params.peer->last_tx_at = ktime_get_seconds(); 514 515 opt = IPV6_PMTUDISC_DO; 516 kernel_setsockopt(conn->params.local->socket, 517 SOL_IPV6, IPV6_MTU_DISCOVER, 518 (char *)&opt, sizeof(opt)); 519 } 520 break; 521 #endif 522 } 523 524 if (ret < 0) 525 trace_rxrpc_tx_fail(call->debug_id, serial, ret, 526 rxrpc_tx_point_call_data_frag); 527 else 528 trace_rxrpc_tx_packet(call->debug_id, &whdr, 529 rxrpc_tx_point_call_data_frag); 530 rxrpc_tx_backoff(call, ret); 531 532 up_write(&conn->params.local->defrag_sem); 533 goto done; 534 } 535 536 /* 537 * reject packets through the local endpoint 538 */ 539 void rxrpc_reject_packets(struct rxrpc_local *local) 540 { 541 struct sockaddr_rxrpc srx; 542 struct rxrpc_skb_priv *sp; 543 struct rxrpc_wire_header whdr; 544 struct sk_buff *skb; 545 struct msghdr msg; 546 struct kvec iov[2]; 547 size_t size; 548 __be32 code; 549 int ret, ioc; 550 551 _enter("%d", local->debug_id); 552 553 iov[0].iov_base = &whdr; 554 iov[0].iov_len = sizeof(whdr); 555 iov[1].iov_base = &code; 556 iov[1].iov_len = sizeof(code); 557 558 msg.msg_name = &srx.transport; 559 msg.msg_control = NULL; 560 msg.msg_controllen = 0; 561 msg.msg_flags = 0; 562 563 memset(&whdr, 0, sizeof(whdr)); 564 565 while ((skb = skb_dequeue(&local->reject_queue))) { 566 rxrpc_see_skb(skb, rxrpc_skb_rx_seen); 567 sp = rxrpc_skb(skb); 568 569 switch (skb->mark) { 570 case RXRPC_SKB_MARK_REJECT_BUSY: 571 whdr.type = RXRPC_PACKET_TYPE_BUSY; 572 size = sizeof(whdr); 573 ioc = 1; 574 break; 575 case RXRPC_SKB_MARK_REJECT_ABORT: 576 whdr.type = RXRPC_PACKET_TYPE_ABORT; 577 code = htonl(skb->priority); 578 size = sizeof(whdr) + sizeof(code); 579 ioc = 2; 580 break; 581 default: 582 rxrpc_free_skb(skb, rxrpc_skb_rx_freed); 583 continue; 584 } 585 586 if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) { 587 msg.msg_namelen = srx.transport_len; 588 589 whdr.epoch = htonl(sp->hdr.epoch); 590 whdr.cid = htonl(sp->hdr.cid); 591 whdr.callNumber = htonl(sp->hdr.callNumber); 592 whdr.serviceId = htons(sp->hdr.serviceId); 593 whdr.flags = sp->hdr.flags; 594 whdr.flags ^= RXRPC_CLIENT_INITIATED; 595 whdr.flags &= RXRPC_CLIENT_INITIATED; 596 597 ret = kernel_sendmsg(local->socket, &msg, 598 iov, ioc, size); 599 if (ret < 0) 600 trace_rxrpc_tx_fail(local->debug_id, 0, ret, 601 rxrpc_tx_point_reject); 602 else 603 trace_rxrpc_tx_packet(local->debug_id, &whdr, 604 rxrpc_tx_point_reject); 605 } 606 607 rxrpc_free_skb(skb, rxrpc_skb_rx_freed); 608 } 609 610 _leave(""); 611 } 612 613 /* 614 * Send a VERSION reply to a peer as a keepalive. 615 */ 616 void rxrpc_send_keepalive(struct rxrpc_peer *peer) 617 { 618 struct rxrpc_wire_header whdr; 619 struct msghdr msg; 620 struct kvec iov[2]; 621 size_t len; 622 int ret; 623 624 _enter(""); 625 626 msg.msg_name = &peer->srx.transport; 627 msg.msg_namelen = peer->srx.transport_len; 628 msg.msg_control = NULL; 629 msg.msg_controllen = 0; 630 msg.msg_flags = 0; 631 632 whdr.epoch = htonl(peer->local->rxnet->epoch); 633 whdr.cid = 0; 634 whdr.callNumber = 0; 635 whdr.seq = 0; 636 whdr.serial = 0; 637 whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */ 638 whdr.flags = RXRPC_LAST_PACKET; 639 whdr.userStatus = 0; 640 whdr.securityIndex = 0; 641 whdr._rsvd = 0; 642 whdr.serviceId = 0; 643 644 iov[0].iov_base = &whdr; 645 iov[0].iov_len = sizeof(whdr); 646 iov[1].iov_base = (char *)rxrpc_keepalive_string; 647 iov[1].iov_len = sizeof(rxrpc_keepalive_string); 648 649 len = iov[0].iov_len + iov[1].iov_len; 650 651 _proto("Tx VERSION (keepalive)"); 652 653 ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len); 654 if (ret < 0) 655 trace_rxrpc_tx_fail(peer->debug_id, 0, ret, 656 rxrpc_tx_point_version_keepalive); 657 else 658 trace_rxrpc_tx_packet(peer->debug_id, &whdr, 659 rxrpc_tx_point_version_keepalive); 660 661 peer->last_tx_at = ktime_get_seconds(); 662 _leave(""); 663 } 664