1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* AF_RXRPC sendmsg() implementation. 3 * 4 * Copyright (C) 2007, 2016 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 <linux/sched/signal.h> 15 16 #include <net/sock.h> 17 #include <net/af_rxrpc.h> 18 #include "ar-internal.h" 19 20 /* 21 * Wait for space to appear in the Tx queue or a signal to occur. 22 */ 23 static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx, 24 struct rxrpc_call *call, 25 long *timeo) 26 { 27 for (;;) { 28 set_current_state(TASK_INTERRUPTIBLE); 29 if (call->tx_top - call->tx_hard_ack < 30 min_t(unsigned int, call->tx_winsize, 31 call->cong_cwnd + call->cong_extra)) 32 return 0; 33 34 if (call->state >= RXRPC_CALL_COMPLETE) 35 return call->error; 36 37 if (signal_pending(current)) 38 return sock_intr_errno(*timeo); 39 40 trace_rxrpc_transmit(call, rxrpc_transmit_wait); 41 mutex_unlock(&call->user_mutex); 42 *timeo = schedule_timeout(*timeo); 43 if (mutex_lock_interruptible(&call->user_mutex) < 0) 44 return sock_intr_errno(*timeo); 45 } 46 } 47 48 /* 49 * Wait for space to appear in the Tx queue uninterruptibly, but with 50 * a timeout of 2*RTT if no progress was made and a signal occurred. 51 */ 52 static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx, 53 struct rxrpc_call *call) 54 { 55 rxrpc_seq_t tx_start, tx_win; 56 signed long rtt2, timeout; 57 u64 rtt; 58 59 rtt = READ_ONCE(call->peer->rtt); 60 rtt2 = nsecs_to_jiffies64(rtt) * 2; 61 if (rtt2 < 1) 62 rtt2 = 1; 63 64 timeout = rtt2; 65 tx_start = READ_ONCE(call->tx_hard_ack); 66 67 for (;;) { 68 set_current_state(TASK_UNINTERRUPTIBLE); 69 70 tx_win = READ_ONCE(call->tx_hard_ack); 71 if (call->tx_top - tx_win < 72 min_t(unsigned int, call->tx_winsize, 73 call->cong_cwnd + call->cong_extra)) 74 return 0; 75 76 if (call->state >= RXRPC_CALL_COMPLETE) 77 return call->error; 78 79 if (test_bit(RXRPC_CALL_IS_INTR, &call->flags) && 80 timeout == 0 && 81 tx_win == tx_start && signal_pending(current)) 82 return -EINTR; 83 84 if (tx_win != tx_start) { 85 timeout = rtt2; 86 tx_start = tx_win; 87 } 88 89 trace_rxrpc_transmit(call, rxrpc_transmit_wait); 90 timeout = schedule_timeout(timeout); 91 } 92 } 93 94 /* 95 * wait for space to appear in the transmit/ACK window 96 * - caller holds the socket locked 97 */ 98 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, 99 struct rxrpc_call *call, 100 long *timeo, 101 bool waitall) 102 { 103 DECLARE_WAITQUEUE(myself, current); 104 int ret; 105 106 _enter(",{%u,%u,%u}", 107 call->tx_hard_ack, call->tx_top, call->tx_winsize); 108 109 add_wait_queue(&call->waitq, &myself); 110 111 if (waitall) 112 ret = rxrpc_wait_for_tx_window_nonintr(rx, call); 113 else 114 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo); 115 116 remove_wait_queue(&call->waitq, &myself); 117 set_current_state(TASK_RUNNING); 118 _leave(" = %d", ret); 119 return ret; 120 } 121 122 /* 123 * Schedule an instant Tx resend. 124 */ 125 static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix) 126 { 127 spin_lock_bh(&call->lock); 128 129 if (call->state < RXRPC_CALL_COMPLETE) { 130 call->rxtx_annotations[ix] = 131 (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) | 132 RXRPC_TX_ANNO_RETRANS; 133 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 134 rxrpc_queue_call(call); 135 } 136 137 spin_unlock_bh(&call->lock); 138 } 139 140 /* 141 * Notify the owner of the call that the transmit phase is ended and the last 142 * packet has been queued. 143 */ 144 static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call, 145 rxrpc_notify_end_tx_t notify_end_tx) 146 { 147 if (notify_end_tx) 148 notify_end_tx(&rx->sk, call, call->user_call_ID); 149 } 150 151 /* 152 * Queue a DATA packet for transmission, set the resend timeout and send 153 * the packet immediately. Returns the error from rxrpc_send_data_packet() 154 * in case the caller wants to do something with it. 155 */ 156 static int rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call, 157 struct sk_buff *skb, bool last, 158 rxrpc_notify_end_tx_t notify_end_tx) 159 { 160 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 161 unsigned long now; 162 rxrpc_seq_t seq = sp->hdr.seq; 163 int ret, ix; 164 u8 annotation = RXRPC_TX_ANNO_UNACK; 165 166 _net("queue skb %p [%d]", skb, seq); 167 168 ASSERTCMP(seq, ==, call->tx_top + 1); 169 170 if (last) 171 annotation |= RXRPC_TX_ANNO_LAST; 172 173 /* We have to set the timestamp before queueing as the retransmit 174 * algorithm can see the packet as soon as we queue it. 175 */ 176 skb->tstamp = ktime_get_real(); 177 178 ix = seq & RXRPC_RXTX_BUFF_MASK; 179 rxrpc_get_skb(skb, rxrpc_skb_tx_got); 180 call->rxtx_annotations[ix] = annotation; 181 smp_wmb(); 182 call->rxtx_buffer[ix] = skb; 183 call->tx_top = seq; 184 if (last) 185 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last); 186 else 187 trace_rxrpc_transmit(call, rxrpc_transmit_queue); 188 189 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { 190 _debug("________awaiting reply/ACK__________"); 191 write_lock_bh(&call->state_lock); 192 switch (call->state) { 193 case RXRPC_CALL_CLIENT_SEND_REQUEST: 194 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; 195 rxrpc_notify_end_tx(rx, call, notify_end_tx); 196 break; 197 case RXRPC_CALL_SERVER_ACK_REQUEST: 198 call->state = RXRPC_CALL_SERVER_SEND_REPLY; 199 now = jiffies; 200 WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET); 201 if (call->ackr_reason == RXRPC_ACK_DELAY) 202 call->ackr_reason = 0; 203 trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now); 204 if (!last) 205 break; 206 /* Fall through */ 207 case RXRPC_CALL_SERVER_SEND_REPLY: 208 call->state = RXRPC_CALL_SERVER_AWAIT_ACK; 209 rxrpc_notify_end_tx(rx, call, notify_end_tx); 210 break; 211 default: 212 break; 213 } 214 write_unlock_bh(&call->state_lock); 215 } 216 217 if (seq == 1 && rxrpc_is_client_call(call)) 218 rxrpc_expose_client_call(call); 219 220 ret = rxrpc_send_data_packet(call, skb, false); 221 if (ret < 0) { 222 switch (ret) { 223 case -ENETUNREACH: 224 case -EHOSTUNREACH: 225 case -ECONNREFUSED: 226 rxrpc_set_call_completion(call, 227 RXRPC_CALL_LOCAL_ERROR, 228 0, ret); 229 rxrpc_notify_socket(call); 230 goto out; 231 } 232 _debug("need instant resend %d", ret); 233 rxrpc_instant_resend(call, ix); 234 } else { 235 unsigned long now = jiffies, resend_at; 236 237 if (call->peer->rtt_usage > 1) 238 resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2); 239 else 240 resend_at = rxrpc_resend_timeout; 241 if (resend_at < 1) 242 resend_at = 1; 243 244 resend_at += now; 245 WRITE_ONCE(call->resend_at, resend_at); 246 rxrpc_reduce_call_timer(call, resend_at, now, 247 rxrpc_timer_set_for_send); 248 } 249 250 out: 251 rxrpc_free_skb(skb, rxrpc_skb_tx_freed); 252 _leave(" = %d", ret); 253 return ret; 254 } 255 256 /* 257 * send data through a socket 258 * - must be called in process context 259 * - The caller holds the call user access mutex, but not the socket lock. 260 */ 261 static int rxrpc_send_data(struct rxrpc_sock *rx, 262 struct rxrpc_call *call, 263 struct msghdr *msg, size_t len, 264 rxrpc_notify_end_tx_t notify_end_tx) 265 { 266 struct rxrpc_skb_priv *sp; 267 struct sk_buff *skb; 268 struct sock *sk = &rx->sk; 269 long timeo; 270 bool more; 271 int ret, copied; 272 273 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 274 275 /* this should be in poll */ 276 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); 277 278 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) 279 return -EPIPE; 280 281 more = msg->msg_flags & MSG_MORE; 282 283 if (call->tx_total_len != -1) { 284 if (len > call->tx_total_len) 285 return -EMSGSIZE; 286 if (!more && len != call->tx_total_len) 287 return -EMSGSIZE; 288 } 289 290 skb = call->tx_pending; 291 call->tx_pending = NULL; 292 rxrpc_see_skb(skb, rxrpc_skb_tx_seen); 293 294 copied = 0; 295 do { 296 /* Check to see if there's a ping ACK to reply to. */ 297 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE) 298 rxrpc_send_ack_packet(call, false, NULL); 299 300 if (!skb) { 301 size_t size, chunk, max, space; 302 303 _debug("alloc"); 304 305 if (call->tx_top - call->tx_hard_ack >= 306 min_t(unsigned int, call->tx_winsize, 307 call->cong_cwnd + call->cong_extra)) { 308 ret = -EAGAIN; 309 if (msg->msg_flags & MSG_DONTWAIT) 310 goto maybe_error; 311 ret = rxrpc_wait_for_tx_window(rx, call, 312 &timeo, 313 msg->msg_flags & MSG_WAITALL); 314 if (ret < 0) 315 goto maybe_error; 316 } 317 318 max = RXRPC_JUMBO_DATALEN; 319 max -= call->conn->security_size; 320 max &= ~(call->conn->size_align - 1UL); 321 322 chunk = max; 323 if (chunk > msg_data_left(msg) && !more) 324 chunk = msg_data_left(msg); 325 326 space = chunk + call->conn->size_align; 327 space &= ~(call->conn->size_align - 1UL); 328 329 size = space + call->conn->security_size; 330 331 _debug("SIZE: %zu/%zu/%zu", chunk, space, size); 332 333 /* create a buffer that we can retain until it's ACK'd */ 334 skb = sock_alloc_send_skb( 335 sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); 336 if (!skb) 337 goto maybe_error; 338 339 rxrpc_new_skb(skb, rxrpc_skb_tx_new); 340 341 _debug("ALLOC SEND %p", skb); 342 343 ASSERTCMP(skb->mark, ==, 0); 344 345 _debug("HS: %u", call->conn->security_size); 346 skb_reserve(skb, call->conn->security_size); 347 skb->len += call->conn->security_size; 348 349 sp = rxrpc_skb(skb); 350 sp->remain = chunk; 351 if (sp->remain > skb_tailroom(skb)) 352 sp->remain = skb_tailroom(skb); 353 354 _net("skb: hr %d, tr %d, hl %d, rm %d", 355 skb_headroom(skb), 356 skb_tailroom(skb), 357 skb_headlen(skb), 358 sp->remain); 359 360 skb->ip_summed = CHECKSUM_UNNECESSARY; 361 } 362 363 _debug("append"); 364 sp = rxrpc_skb(skb); 365 366 /* append next segment of data to the current buffer */ 367 if (msg_data_left(msg) > 0) { 368 int copy = skb_tailroom(skb); 369 ASSERTCMP(copy, >, 0); 370 if (copy > msg_data_left(msg)) 371 copy = msg_data_left(msg); 372 if (copy > sp->remain) 373 copy = sp->remain; 374 375 _debug("add"); 376 ret = skb_add_data(skb, &msg->msg_iter, copy); 377 _debug("added"); 378 if (ret < 0) 379 goto efault; 380 sp->remain -= copy; 381 skb->mark += copy; 382 copied += copy; 383 if (call->tx_total_len != -1) 384 call->tx_total_len -= copy; 385 } 386 387 /* check for the far side aborting the call or a network error 388 * occurring */ 389 if (call->state == RXRPC_CALL_COMPLETE) 390 goto call_terminated; 391 392 /* add the packet to the send queue if it's now full */ 393 if (sp->remain <= 0 || 394 (msg_data_left(msg) == 0 && !more)) { 395 struct rxrpc_connection *conn = call->conn; 396 uint32_t seq; 397 size_t pad; 398 399 /* pad out if we're using security */ 400 if (conn->security_ix) { 401 pad = conn->security_size + skb->mark; 402 pad = conn->size_align - pad; 403 pad &= conn->size_align - 1; 404 _debug("pad %zu", pad); 405 if (pad) 406 skb_put_zero(skb, pad); 407 } 408 409 seq = call->tx_top + 1; 410 411 sp->hdr.seq = seq; 412 sp->hdr._rsvd = 0; 413 sp->hdr.flags = conn->out_clientflag; 414 415 if (msg_data_left(msg) == 0 && !more) 416 sp->hdr.flags |= RXRPC_LAST_PACKET; 417 else if (call->tx_top - call->tx_hard_ack < 418 call->tx_winsize) 419 sp->hdr.flags |= RXRPC_MORE_PACKETS; 420 421 ret = conn->security->secure_packet( 422 call, skb, skb->mark, skb->head); 423 if (ret < 0) 424 goto out; 425 426 ret = rxrpc_queue_packet(rx, call, skb, 427 !msg_data_left(msg) && !more, 428 notify_end_tx); 429 /* Should check for failure here */ 430 skb = NULL; 431 } 432 } while (msg_data_left(msg) > 0); 433 434 success: 435 ret = copied; 436 out: 437 call->tx_pending = skb; 438 _leave(" = %d", ret); 439 return ret; 440 441 call_terminated: 442 rxrpc_free_skb(skb, rxrpc_skb_tx_freed); 443 _leave(" = %d", call->error); 444 return call->error; 445 446 maybe_error: 447 if (copied) 448 goto success; 449 goto out; 450 451 efault: 452 ret = -EFAULT; 453 goto out; 454 } 455 456 /* 457 * extract control messages from the sendmsg() control buffer 458 */ 459 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p) 460 { 461 struct cmsghdr *cmsg; 462 bool got_user_ID = false; 463 int len; 464 465 if (msg->msg_controllen == 0) 466 return -EINVAL; 467 468 for_each_cmsghdr(cmsg, msg) { 469 if (!CMSG_OK(msg, cmsg)) 470 return -EINVAL; 471 472 len = cmsg->cmsg_len - sizeof(struct cmsghdr); 473 _debug("CMSG %d, %d, %d", 474 cmsg->cmsg_level, cmsg->cmsg_type, len); 475 476 if (cmsg->cmsg_level != SOL_RXRPC) 477 continue; 478 479 switch (cmsg->cmsg_type) { 480 case RXRPC_USER_CALL_ID: 481 if (msg->msg_flags & MSG_CMSG_COMPAT) { 482 if (len != sizeof(u32)) 483 return -EINVAL; 484 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg); 485 } else { 486 if (len != sizeof(unsigned long)) 487 return -EINVAL; 488 p->call.user_call_ID = *(unsigned long *) 489 CMSG_DATA(cmsg); 490 } 491 got_user_ID = true; 492 break; 493 494 case RXRPC_ABORT: 495 if (p->command != RXRPC_CMD_SEND_DATA) 496 return -EINVAL; 497 p->command = RXRPC_CMD_SEND_ABORT; 498 if (len != sizeof(p->abort_code)) 499 return -EINVAL; 500 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg); 501 if (p->abort_code == 0) 502 return -EINVAL; 503 break; 504 505 case RXRPC_ACCEPT: 506 if (p->command != RXRPC_CMD_SEND_DATA) 507 return -EINVAL; 508 p->command = RXRPC_CMD_ACCEPT; 509 if (len != 0) 510 return -EINVAL; 511 break; 512 513 case RXRPC_EXCLUSIVE_CALL: 514 p->exclusive = true; 515 if (len != 0) 516 return -EINVAL; 517 break; 518 519 case RXRPC_UPGRADE_SERVICE: 520 p->upgrade = true; 521 if (len != 0) 522 return -EINVAL; 523 break; 524 525 case RXRPC_TX_LENGTH: 526 if (p->call.tx_total_len != -1 || len != sizeof(__s64)) 527 return -EINVAL; 528 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg); 529 if (p->call.tx_total_len < 0) 530 return -EINVAL; 531 break; 532 533 case RXRPC_SET_CALL_TIMEOUT: 534 if (len & 3 || len < 4 || len > 12) 535 return -EINVAL; 536 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len); 537 p->call.nr_timeouts = len / 4; 538 if (p->call.timeouts.hard > INT_MAX / HZ) 539 return -ERANGE; 540 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000) 541 return -ERANGE; 542 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000) 543 return -ERANGE; 544 break; 545 546 default: 547 return -EINVAL; 548 } 549 } 550 551 if (!got_user_ID) 552 return -EINVAL; 553 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA) 554 return -EINVAL; 555 _leave(" = 0"); 556 return 0; 557 } 558 559 /* 560 * Create a new client call for sendmsg(). 561 * - Called with the socket lock held, which it must release. 562 * - If it returns a call, the call's lock will need releasing by the caller. 563 */ 564 static struct rxrpc_call * 565 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, 566 struct rxrpc_send_params *p) 567 __releases(&rx->sk.sk_lock.slock) 568 __acquires(&call->user_mutex) 569 { 570 struct rxrpc_conn_parameters cp; 571 struct rxrpc_call *call; 572 struct key *key; 573 574 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name); 575 576 _enter(""); 577 578 if (!msg->msg_name) { 579 release_sock(&rx->sk); 580 return ERR_PTR(-EDESTADDRREQ); 581 } 582 583 key = rx->key; 584 if (key && !rx->key->payload.data[0]) 585 key = NULL; 586 587 memset(&cp, 0, sizeof(cp)); 588 cp.local = rx->local; 589 cp.key = rx->key; 590 cp.security_level = rx->min_sec_level; 591 cp.exclusive = rx->exclusive | p->exclusive; 592 cp.upgrade = p->upgrade; 593 cp.service_id = srx->srx_service; 594 call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL, 595 atomic_inc_return(&rxrpc_debug_id)); 596 /* The socket is now unlocked */ 597 598 rxrpc_put_peer(cp.peer); 599 _leave(" = %p\n", call); 600 return call; 601 } 602 603 /* 604 * send a message forming part of a client call through an RxRPC socket 605 * - caller holds the socket locked 606 * - the socket may be either a client socket or a server socket 607 */ 608 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len) 609 __releases(&rx->sk.sk_lock.slock) 610 __releases(&call->user_mutex) 611 { 612 enum rxrpc_call_state state; 613 struct rxrpc_call *call; 614 unsigned long now, j; 615 int ret; 616 617 struct rxrpc_send_params p = { 618 .call.tx_total_len = -1, 619 .call.user_call_ID = 0, 620 .call.nr_timeouts = 0, 621 .call.intr = true, 622 .abort_code = 0, 623 .command = RXRPC_CMD_SEND_DATA, 624 .exclusive = false, 625 .upgrade = false, 626 }; 627 628 _enter(""); 629 630 ret = rxrpc_sendmsg_cmsg(msg, &p); 631 if (ret < 0) 632 goto error_release_sock; 633 634 if (p.command == RXRPC_CMD_ACCEPT) { 635 ret = -EINVAL; 636 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) 637 goto error_release_sock; 638 call = rxrpc_accept_call(rx, p.call.user_call_ID, NULL); 639 /* The socket is now unlocked. */ 640 if (IS_ERR(call)) 641 return PTR_ERR(call); 642 ret = 0; 643 goto out_put_unlock; 644 } 645 646 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID); 647 if (!call) { 648 ret = -EBADSLT; 649 if (p.command != RXRPC_CMD_SEND_DATA) 650 goto error_release_sock; 651 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p); 652 /* The socket is now unlocked... */ 653 if (IS_ERR(call)) 654 return PTR_ERR(call); 655 /* ... and we have the call lock. */ 656 } else { 657 switch (READ_ONCE(call->state)) { 658 case RXRPC_CALL_UNINITIALISED: 659 case RXRPC_CALL_CLIENT_AWAIT_CONN: 660 case RXRPC_CALL_SERVER_PREALLOC: 661 case RXRPC_CALL_SERVER_SECURING: 662 case RXRPC_CALL_SERVER_ACCEPTING: 663 ret = -EBUSY; 664 goto error_release_sock; 665 default: 666 break; 667 } 668 669 ret = mutex_lock_interruptible(&call->user_mutex); 670 release_sock(&rx->sk); 671 if (ret < 0) { 672 ret = -ERESTARTSYS; 673 goto error_put; 674 } 675 676 if (p.call.tx_total_len != -1) { 677 ret = -EINVAL; 678 if (call->tx_total_len != -1 || 679 call->tx_pending || 680 call->tx_top != 0) 681 goto error_put; 682 call->tx_total_len = p.call.tx_total_len; 683 } 684 } 685 686 switch (p.call.nr_timeouts) { 687 case 3: 688 j = msecs_to_jiffies(p.call.timeouts.normal); 689 if (p.call.timeouts.normal > 0 && j == 0) 690 j = 1; 691 WRITE_ONCE(call->next_rx_timo, j); 692 /* Fall through */ 693 case 2: 694 j = msecs_to_jiffies(p.call.timeouts.idle); 695 if (p.call.timeouts.idle > 0 && j == 0) 696 j = 1; 697 WRITE_ONCE(call->next_req_timo, j); 698 /* Fall through */ 699 case 1: 700 if (p.call.timeouts.hard > 0) { 701 j = msecs_to_jiffies(p.call.timeouts.hard); 702 now = jiffies; 703 j += now; 704 WRITE_ONCE(call->expect_term_by, j); 705 rxrpc_reduce_call_timer(call, j, now, 706 rxrpc_timer_set_for_hard); 707 } 708 break; 709 } 710 711 state = READ_ONCE(call->state); 712 _debug("CALL %d USR %lx ST %d on CONN %p", 713 call->debug_id, call->user_call_ID, state, call->conn); 714 715 if (state >= RXRPC_CALL_COMPLETE) { 716 /* it's too late for this call */ 717 ret = -ESHUTDOWN; 718 } else if (p.command == RXRPC_CMD_SEND_ABORT) { 719 ret = 0; 720 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED)) 721 ret = rxrpc_send_abort_packet(call); 722 } else if (p.command != RXRPC_CMD_SEND_DATA) { 723 ret = -EINVAL; 724 } else if (rxrpc_is_client_call(call) && 725 state != RXRPC_CALL_CLIENT_SEND_REQUEST) { 726 /* request phase complete for this client call */ 727 ret = -EPROTO; 728 } else if (rxrpc_is_service_call(call) && 729 state != RXRPC_CALL_SERVER_ACK_REQUEST && 730 state != RXRPC_CALL_SERVER_SEND_REPLY) { 731 /* Reply phase not begun or not complete for service call. */ 732 ret = -EPROTO; 733 } else { 734 ret = rxrpc_send_data(rx, call, msg, len, NULL); 735 } 736 737 out_put_unlock: 738 mutex_unlock(&call->user_mutex); 739 error_put: 740 rxrpc_put_call(call, rxrpc_call_put); 741 _leave(" = %d", ret); 742 return ret; 743 744 error_release_sock: 745 release_sock(&rx->sk); 746 return ret; 747 } 748 749 /** 750 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call 751 * @sock: The socket the call is on 752 * @call: The call to send data through 753 * @msg: The data to send 754 * @len: The amount of data to send 755 * @notify_end_tx: Notification that the last packet is queued. 756 * 757 * Allow a kernel service to send data on a call. The call must be in an state 758 * appropriate to sending data. No control data should be supplied in @msg, 759 * nor should an address be supplied. MSG_MORE should be flagged if there's 760 * more data to come, otherwise this data will end the transmission phase. 761 */ 762 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call, 763 struct msghdr *msg, size_t len, 764 rxrpc_notify_end_tx_t notify_end_tx) 765 { 766 int ret; 767 768 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); 769 770 ASSERTCMP(msg->msg_name, ==, NULL); 771 ASSERTCMP(msg->msg_control, ==, NULL); 772 773 mutex_lock(&call->user_mutex); 774 775 _debug("CALL %d USR %lx ST %d on CONN %p", 776 call->debug_id, call->user_call_ID, call->state, call->conn); 777 778 switch (READ_ONCE(call->state)) { 779 case RXRPC_CALL_CLIENT_SEND_REQUEST: 780 case RXRPC_CALL_SERVER_ACK_REQUEST: 781 case RXRPC_CALL_SERVER_SEND_REPLY: 782 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len, 783 notify_end_tx); 784 break; 785 case RXRPC_CALL_COMPLETE: 786 read_lock_bh(&call->state_lock); 787 ret = call->error; 788 read_unlock_bh(&call->state_lock); 789 break; 790 default: 791 /* Request phase complete for this client call */ 792 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send")); 793 ret = -EPROTO; 794 break; 795 } 796 797 mutex_unlock(&call->user_mutex); 798 _leave(" = %d", ret); 799 return ret; 800 } 801 EXPORT_SYMBOL(rxrpc_kernel_send_data); 802 803 /** 804 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call 805 * @sock: The socket the call is on 806 * @call: The call to be aborted 807 * @abort_code: The abort code to stick into the ABORT packet 808 * @error: Local error value 809 * @why: 3-char string indicating why. 810 * 811 * Allow a kernel service to abort a call, if it's still in an abortable state 812 * and return true if the call was aborted, false if it was already complete. 813 */ 814 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call, 815 u32 abort_code, int error, const char *why) 816 { 817 bool aborted; 818 819 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why); 820 821 mutex_lock(&call->user_mutex); 822 823 aborted = rxrpc_abort_call(why, call, 0, abort_code, error); 824 if (aborted) 825 rxrpc_send_abort_packet(call); 826 827 mutex_unlock(&call->user_mutex); 828 return aborted; 829 } 830 EXPORT_SYMBOL(rxrpc_kernel_abort_call); 831 832 /** 833 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call 834 * @sock: The socket the call is on 835 * @call: The call to be informed 836 * @tx_total_len: The amount of data to be transmitted for this call 837 * 838 * Allow a kernel service to set the total transmit length on a call. This 839 * allows buffer-to-packet encrypt-and-copy to be performed. 840 * 841 * This function is primarily for use for setting the reply length since the 842 * request length can be set when beginning the call. 843 */ 844 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call, 845 s64 tx_total_len) 846 { 847 WARN_ON(call->tx_total_len != -1); 848 call->tx_total_len = tx_total_len; 849 } 850 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length); 851