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(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 */ 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 */ 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 */ 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 */ 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 */ 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 /* Each transmission of a Tx packet needs a new serial number */ 361 serial = atomic_inc_return(&conn->serial); 362 363 whdr.epoch = htonl(conn->proto.epoch); 364 whdr.cid = htonl(call->cid); 365 whdr.callNumber = htonl(call->call_id); 366 whdr.seq = htonl(sp->hdr.seq); 367 whdr.serial = htonl(serial); 368 whdr.type = RXRPC_PACKET_TYPE_DATA; 369 whdr.flags = sp->hdr.flags; 370 whdr.userStatus = 0; 371 whdr.securityIndex = call->security_ix; 372 whdr._rsvd = htons(sp->hdr._rsvd); 373 whdr.serviceId = htons(call->service_id); 374 375 if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) && 376 sp->hdr.seq == 1) 377 whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE; 378 379 iov[0].iov_base = &whdr; 380 iov[0].iov_len = sizeof(whdr); 381 iov[1].iov_base = skb->head; 382 iov[1].iov_len = skb->len; 383 len = iov[0].iov_len + iov[1].iov_len; 384 385 msg.msg_name = &call->peer->srx.transport; 386 msg.msg_namelen = call->peer->srx.transport_len; 387 msg.msg_control = NULL; 388 msg.msg_controllen = 0; 389 msg.msg_flags = 0; 390 391 /* If our RTT cache needs working on, request an ACK. Also request 392 * ACKs if a DATA packet appears to have been lost. 393 * 394 * However, we mustn't request an ACK on the last reply packet of a 395 * service call, lest OpenAFS incorrectly send us an ACK with some 396 * soft-ACKs in it and then never follow up with a proper hard ACK. 397 */ 398 if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) || 399 rxrpc_to_server(sp) 400 ) && 401 (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) || 402 retrans || 403 call->cong_mode == RXRPC_CALL_SLOW_START || 404 (call->peer->rtt_count < 3 && sp->hdr.seq & 1) || 405 ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), 406 ktime_get_real()))) 407 whdr.flags |= RXRPC_REQUEST_ACK; 408 409 if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { 410 static int lose; 411 if ((lose++ & 7) == 7) { 412 ret = 0; 413 trace_rxrpc_tx_data(call, sp->hdr.seq, serial, 414 whdr.flags, retrans, true); 415 goto done; 416 } 417 } 418 419 trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, retrans, 420 false); 421 422 /* send the packet with the don't fragment bit set if we currently 423 * think it's small enough */ 424 if (iov[1].iov_len >= call->peer->maxdata) 425 goto send_fragmentable; 426 427 down_read(&conn->params.local->defrag_sem); 428 429 sp->hdr.serial = serial; 430 smp_wmb(); /* Set serial before timestamp */ 431 skb->tstamp = ktime_get_real(); 432 if (whdr.flags & RXRPC_REQUEST_ACK) 433 rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data); 434 435 /* send the packet by UDP 436 * - returns -EMSGSIZE if UDP would have to fragment the packet 437 * to go out of the interface 438 * - in which case, we'll have processed the ICMP error 439 * message and update the peer record 440 */ 441 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); 442 conn->params.peer->last_tx_at = ktime_get_seconds(); 443 444 up_read(&conn->params.local->defrag_sem); 445 if (ret < 0) { 446 rxrpc_cancel_rtt_probe(call, serial, rtt_slot); 447 trace_rxrpc_tx_fail(call->debug_id, serial, ret, 448 rxrpc_tx_point_call_data_nofrag); 449 } else { 450 trace_rxrpc_tx_packet(call->debug_id, &whdr, 451 rxrpc_tx_point_call_data_nofrag); 452 } 453 454 rxrpc_tx_backoff(call, ret); 455 if (ret == -EMSGSIZE) 456 goto send_fragmentable; 457 458 done: 459 if (ret >= 0) { 460 if (whdr.flags & RXRPC_REQUEST_ACK) { 461 call->peer->rtt_last_req = skb->tstamp; 462 if (call->peer->rtt_count > 1) { 463 unsigned long nowj = jiffies, ack_lost_at; 464 465 ack_lost_at = rxrpc_get_rto_backoff(call->peer, retrans); 466 ack_lost_at += nowj; 467 WRITE_ONCE(call->ack_lost_at, ack_lost_at); 468 rxrpc_reduce_call_timer(call, ack_lost_at, nowj, 469 rxrpc_timer_set_for_lost_ack); 470 } 471 } 472 473 if (sp->hdr.seq == 1 && 474 !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, 475 &call->flags)) { 476 unsigned long nowj = jiffies, expect_rx_by; 477 478 expect_rx_by = nowj + call->next_rx_timo; 479 WRITE_ONCE(call->expect_rx_by, expect_rx_by); 480 rxrpc_reduce_call_timer(call, expect_rx_by, nowj, 481 rxrpc_timer_set_for_normal); 482 } 483 484 rxrpc_set_keepalive(call); 485 } else { 486 /* Cancel the call if the initial transmission fails, 487 * particularly if that's due to network routing issues that 488 * aren't going away anytime soon. The layer above can arrange 489 * the retransmission. 490 */ 491 if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags)) 492 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 493 RX_USER_ABORT, ret); 494 } 495 496 _leave(" = %d [%u]", ret, call->peer->maxdata); 497 return ret; 498 499 send_fragmentable: 500 /* attempt to send this message with fragmentation enabled */ 501 _debug("send fragment"); 502 503 down_write(&conn->params.local->defrag_sem); 504 505 sp->hdr.serial = serial; 506 smp_wmb(); /* Set serial before timestamp */ 507 skb->tstamp = ktime_get_real(); 508 if (whdr.flags & RXRPC_REQUEST_ACK) 509 rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data); 510 511 switch (conn->params.local->srx.transport.family) { 512 case AF_INET6: 513 case AF_INET: 514 ip_sock_set_mtu_discover(conn->params.local->socket->sk, 515 IP_PMTUDISC_DONT); 516 ret = kernel_sendmsg(conn->params.local->socket, &msg, 517 iov, 2, len); 518 conn->params.peer->last_tx_at = ktime_get_seconds(); 519 520 ip_sock_set_mtu_discover(conn->params.local->socket->sk, 521 IP_PMTUDISC_DO); 522 break; 523 524 default: 525 BUG(); 526 } 527 528 if (ret < 0) { 529 rxrpc_cancel_rtt_probe(call, serial, rtt_slot); 530 trace_rxrpc_tx_fail(call->debug_id, serial, ret, 531 rxrpc_tx_point_call_data_frag); 532 } else { 533 trace_rxrpc_tx_packet(call->debug_id, &whdr, 534 rxrpc_tx_point_call_data_frag); 535 } 536 rxrpc_tx_backoff(call, ret); 537 538 up_write(&conn->params.local->defrag_sem); 539 goto done; 540 } 541 542 /* 543 * reject packets through the local endpoint 544 */ 545 void rxrpc_reject_packets(struct rxrpc_local *local) 546 { 547 struct sockaddr_rxrpc srx; 548 struct rxrpc_skb_priv *sp; 549 struct rxrpc_wire_header whdr; 550 struct sk_buff *skb; 551 struct msghdr msg; 552 struct kvec iov[2]; 553 size_t size; 554 __be32 code; 555 int ret, ioc; 556 557 _enter("%d", local->debug_id); 558 559 iov[0].iov_base = &whdr; 560 iov[0].iov_len = sizeof(whdr); 561 iov[1].iov_base = &code; 562 iov[1].iov_len = sizeof(code); 563 564 msg.msg_name = &srx.transport; 565 msg.msg_control = NULL; 566 msg.msg_controllen = 0; 567 msg.msg_flags = 0; 568 569 memset(&whdr, 0, sizeof(whdr)); 570 571 while ((skb = skb_dequeue(&local->reject_queue))) { 572 rxrpc_see_skb(skb, rxrpc_skb_seen); 573 sp = rxrpc_skb(skb); 574 575 switch (skb->mark) { 576 case RXRPC_SKB_MARK_REJECT_BUSY: 577 whdr.type = RXRPC_PACKET_TYPE_BUSY; 578 size = sizeof(whdr); 579 ioc = 1; 580 break; 581 case RXRPC_SKB_MARK_REJECT_ABORT: 582 whdr.type = RXRPC_PACKET_TYPE_ABORT; 583 code = htonl(skb->priority); 584 size = sizeof(whdr) + sizeof(code); 585 ioc = 2; 586 break; 587 default: 588 rxrpc_free_skb(skb, rxrpc_skb_freed); 589 continue; 590 } 591 592 if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) { 593 msg.msg_namelen = srx.transport_len; 594 595 whdr.epoch = htonl(sp->hdr.epoch); 596 whdr.cid = htonl(sp->hdr.cid); 597 whdr.callNumber = htonl(sp->hdr.callNumber); 598 whdr.serviceId = htons(sp->hdr.serviceId); 599 whdr.flags = sp->hdr.flags; 600 whdr.flags ^= RXRPC_CLIENT_INITIATED; 601 whdr.flags &= RXRPC_CLIENT_INITIATED; 602 603 ret = kernel_sendmsg(local->socket, &msg, 604 iov, ioc, size); 605 if (ret < 0) 606 trace_rxrpc_tx_fail(local->debug_id, 0, ret, 607 rxrpc_tx_point_reject); 608 else 609 trace_rxrpc_tx_packet(local->debug_id, &whdr, 610 rxrpc_tx_point_reject); 611 } 612 613 rxrpc_free_skb(skb, rxrpc_skb_freed); 614 } 615 616 _leave(""); 617 } 618 619 /* 620 * Send a VERSION reply to a peer as a keepalive. 621 */ 622 void rxrpc_send_keepalive(struct rxrpc_peer *peer) 623 { 624 struct rxrpc_wire_header whdr; 625 struct msghdr msg; 626 struct kvec iov[2]; 627 size_t len; 628 int ret; 629 630 _enter(""); 631 632 msg.msg_name = &peer->srx.transport; 633 msg.msg_namelen = peer->srx.transport_len; 634 msg.msg_control = NULL; 635 msg.msg_controllen = 0; 636 msg.msg_flags = 0; 637 638 whdr.epoch = htonl(peer->local->rxnet->epoch); 639 whdr.cid = 0; 640 whdr.callNumber = 0; 641 whdr.seq = 0; 642 whdr.serial = 0; 643 whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */ 644 whdr.flags = RXRPC_LAST_PACKET; 645 whdr.userStatus = 0; 646 whdr.securityIndex = 0; 647 whdr._rsvd = 0; 648 whdr.serviceId = 0; 649 650 iov[0].iov_base = &whdr; 651 iov[0].iov_len = sizeof(whdr); 652 iov[1].iov_base = (char *)rxrpc_keepalive_string; 653 iov[1].iov_len = sizeof(rxrpc_keepalive_string); 654 655 len = iov[0].iov_len + iov[1].iov_len; 656 657 _proto("Tx VERSION (keepalive)"); 658 659 ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len); 660 if (ret < 0) 661 trace_rxrpc_tx_fail(peer->debug_id, 0, ret, 662 rxrpc_tx_point_version_keepalive); 663 else 664 trace_rxrpc_tx_packet(peer->debug_id, &whdr, 665 rxrpc_tx_point_version_keepalive); 666 667 peer->last_tx_at = ktime_get_seconds(); 668 _leave(""); 669 } 670