1 /* AF_RXRPC sendmsg() implementation. 2 * 3 * Copyright (C) 2007, 2016 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 Licence 8 * as published by the Free Software Foundation; either version 9 * 2 of the Licence, 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 <linux/sched/signal.h> 19 20 #include <net/sock.h> 21 #include <net/af_rxrpc.h> 22 #include "ar-internal.h" 23 24 /* 25 * Wait for space to appear in the Tx queue or a signal to occur. 26 */ 27 static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx, 28 struct rxrpc_call *call, 29 long *timeo) 30 { 31 for (;;) { 32 set_current_state(TASK_INTERRUPTIBLE); 33 if (call->tx_top - call->tx_hard_ack < 34 min_t(unsigned int, call->tx_winsize, 35 call->cong_cwnd + call->cong_extra)) 36 return 0; 37 38 if (call->state >= RXRPC_CALL_COMPLETE) 39 return call->error; 40 41 if (signal_pending(current)) 42 return sock_intr_errno(*timeo); 43 44 trace_rxrpc_transmit(call, rxrpc_transmit_wait); 45 mutex_unlock(&call->user_mutex); 46 *timeo = schedule_timeout(*timeo); 47 if (mutex_lock_interruptible(&call->user_mutex) < 0) 48 return sock_intr_errno(*timeo); 49 } 50 } 51 52 /* 53 * Wait for space to appear in the Tx queue uninterruptibly, but with 54 * a timeout of 2*RTT if no progress was made and a signal occurred. 55 */ 56 static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx, 57 struct rxrpc_call *call) 58 { 59 rxrpc_seq_t tx_start, tx_win; 60 signed long rtt2, timeout; 61 u64 rtt; 62 63 rtt = READ_ONCE(call->peer->rtt); 64 rtt2 = nsecs_to_jiffies64(rtt) * 2; 65 if (rtt2 < 1) 66 rtt2 = 1; 67 68 timeout = rtt2; 69 tx_start = READ_ONCE(call->tx_hard_ack); 70 71 for (;;) { 72 set_current_state(TASK_UNINTERRUPTIBLE); 73 74 tx_win = READ_ONCE(call->tx_hard_ack); 75 if (call->tx_top - tx_win < 76 min_t(unsigned int, call->tx_winsize, 77 call->cong_cwnd + call->cong_extra)) 78 return 0; 79 80 if (call->state >= RXRPC_CALL_COMPLETE) 81 return call->error; 82 83 if (timeout == 0 && 84 tx_win == tx_start && signal_pending(current)) 85 return -EINTR; 86 87 if (tx_win != tx_start) { 88 timeout = rtt2; 89 tx_start = tx_win; 90 } 91 92 trace_rxrpc_transmit(call, rxrpc_transmit_wait); 93 timeout = schedule_timeout(timeout); 94 } 95 } 96 97 /* 98 * wait for space to appear in the transmit/ACK window 99 * - caller holds the socket locked 100 */ 101 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, 102 struct rxrpc_call *call, 103 long *timeo, 104 bool waitall) 105 { 106 DECLARE_WAITQUEUE(myself, current); 107 int ret; 108 109 _enter(",{%u,%u,%u}", 110 call->tx_hard_ack, call->tx_top, call->tx_winsize); 111 112 add_wait_queue(&call->waitq, &myself); 113 114 if (waitall) 115 ret = rxrpc_wait_for_tx_window_nonintr(rx, call); 116 else 117 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo); 118 119 remove_wait_queue(&call->waitq, &myself); 120 set_current_state(TASK_RUNNING); 121 _leave(" = %d", ret); 122 return ret; 123 } 124 125 /* 126 * Schedule an instant Tx resend. 127 */ 128 static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix) 129 { 130 spin_lock_bh(&call->lock); 131 132 if (call->state < RXRPC_CALL_COMPLETE) { 133 call->rxtx_annotations[ix] = 134 (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) | 135 RXRPC_TX_ANNO_RETRANS; 136 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 137 rxrpc_queue_call(call); 138 } 139 140 spin_unlock_bh(&call->lock); 141 } 142 143 /* 144 * Notify the owner of the call that the transmit phase is ended and the last 145 * packet has been queued. 146 */ 147 static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call, 148 rxrpc_notify_end_tx_t notify_end_tx) 149 { 150 if (notify_end_tx) 151 notify_end_tx(&rx->sk, call, call->user_call_ID); 152 } 153 154 /* 155 * Queue a DATA packet for transmission, set the resend timeout and send the 156 * packet immediately 157 */ 158 static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call, 159 struct sk_buff *skb, bool last, 160 rxrpc_notify_end_tx_t notify_end_tx) 161 { 162 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 163 unsigned long now; 164 rxrpc_seq_t seq = sp->hdr.seq; 165 int ret, ix; 166 u8 annotation = RXRPC_TX_ANNO_UNACK; 167 168 _net("queue skb %p [%d]", skb, seq); 169 170 ASSERTCMP(seq, ==, call->tx_top + 1); 171 172 if (last) 173 annotation |= RXRPC_TX_ANNO_LAST; 174 175 /* We have to set the timestamp before queueing as the retransmit 176 * algorithm can see the packet as soon as we queue it. 177 */ 178 skb->tstamp = ktime_get_real(); 179 180 ix = seq & RXRPC_RXTX_BUFF_MASK; 181 rxrpc_get_skb(skb, rxrpc_skb_tx_got); 182 call->rxtx_annotations[ix] = annotation; 183 smp_wmb(); 184 call->rxtx_buffer[ix] = skb; 185 call->tx_top = seq; 186 if (last) 187 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last); 188 else 189 trace_rxrpc_transmit(call, rxrpc_transmit_queue); 190 191 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { 192 _debug("________awaiting reply/ACK__________"); 193 write_lock_bh(&call->state_lock); 194 switch (call->state) { 195 case RXRPC_CALL_CLIENT_SEND_REQUEST: 196 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; 197 rxrpc_notify_end_tx(rx, call, notify_end_tx); 198 break; 199 case RXRPC_CALL_SERVER_ACK_REQUEST: 200 call->state = RXRPC_CALL_SERVER_SEND_REPLY; 201 now = jiffies; 202 WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET); 203 if (call->ackr_reason == RXRPC_ACK_DELAY) 204 call->ackr_reason = 0; 205 trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now); 206 if (!last) 207 break; 208 /* Fall through */ 209 case RXRPC_CALL_SERVER_SEND_REPLY: 210 call->state = RXRPC_CALL_SERVER_AWAIT_ACK; 211 rxrpc_notify_end_tx(rx, call, notify_end_tx); 212 break; 213 default: 214 break; 215 } 216 write_unlock_bh(&call->state_lock); 217 } 218 219 if (seq == 1 && rxrpc_is_client_call(call)) 220 rxrpc_expose_client_call(call); 221 222 ret = rxrpc_send_data_packet(call, skb, false); 223 if (ret < 0) { 224 switch (ret) { 225 case -ENETUNREACH: 226 case -EHOSTUNREACH: 227 case -ECONNREFUSED: 228 rxrpc_set_call_completion(call, 229 RXRPC_CALL_LOCAL_ERROR, 230 0, ret); 231 goto out; 232 } 233 _debug("need instant resend %d", ret); 234 rxrpc_instant_resend(call, ix); 235 } else { 236 unsigned long now = jiffies, resend_at; 237 238 if (call->peer->rtt_usage > 1) 239 resend_at = nsecs_to_jiffies(call->peer->rtt * 3 / 2); 240 else 241 resend_at = rxrpc_resend_timeout; 242 if (resend_at < 1) 243 resend_at = 1; 244 245 resend_at += now; 246 WRITE_ONCE(call->resend_at, resend_at); 247 rxrpc_reduce_call_timer(call, resend_at, now, 248 rxrpc_timer_set_for_send); 249 } 250 251 out: 252 rxrpc_free_skb(skb, rxrpc_skb_tx_freed); 253 _leave(""); 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 rxrpc_queue_packet(rx, call, skb, 427 !msg_data_left(msg) && !more, 428 notify_end_tx); 429 skb = NULL; 430 } 431 } while (msg_data_left(msg) > 0); 432 433 success: 434 ret = copied; 435 out: 436 call->tx_pending = skb; 437 _leave(" = %d", ret); 438 return ret; 439 440 call_terminated: 441 rxrpc_free_skb(skb, rxrpc_skb_tx_freed); 442 _leave(" = %d", call->error); 443 return call->error; 444 445 maybe_error: 446 if (copied) 447 goto success; 448 goto out; 449 450 efault: 451 ret = -EFAULT; 452 goto out; 453 } 454 455 /* 456 * extract control messages from the sendmsg() control buffer 457 */ 458 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p) 459 { 460 struct cmsghdr *cmsg; 461 bool got_user_ID = false; 462 int len; 463 464 if (msg->msg_controllen == 0) 465 return -EINVAL; 466 467 for_each_cmsghdr(cmsg, msg) { 468 if (!CMSG_OK(msg, cmsg)) 469 return -EINVAL; 470 471 len = cmsg->cmsg_len - sizeof(struct cmsghdr); 472 _debug("CMSG %d, %d, %d", 473 cmsg->cmsg_level, cmsg->cmsg_type, len); 474 475 if (cmsg->cmsg_level != SOL_RXRPC) 476 continue; 477 478 switch (cmsg->cmsg_type) { 479 case RXRPC_USER_CALL_ID: 480 if (msg->msg_flags & MSG_CMSG_COMPAT) { 481 if (len != sizeof(u32)) 482 return -EINVAL; 483 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg); 484 } else { 485 if (len != sizeof(unsigned long)) 486 return -EINVAL; 487 p->call.user_call_ID = *(unsigned long *) 488 CMSG_DATA(cmsg); 489 } 490 got_user_ID = true; 491 break; 492 493 case RXRPC_ABORT: 494 if (p->command != RXRPC_CMD_SEND_DATA) 495 return -EINVAL; 496 p->command = RXRPC_CMD_SEND_ABORT; 497 if (len != sizeof(p->abort_code)) 498 return -EINVAL; 499 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg); 500 if (p->abort_code == 0) 501 return -EINVAL; 502 break; 503 504 case RXRPC_ACCEPT: 505 if (p->command != RXRPC_CMD_SEND_DATA) 506 return -EINVAL; 507 p->command = RXRPC_CMD_ACCEPT; 508 if (len != 0) 509 return -EINVAL; 510 break; 511 512 case RXRPC_EXCLUSIVE_CALL: 513 p->exclusive = true; 514 if (len != 0) 515 return -EINVAL; 516 break; 517 518 case RXRPC_UPGRADE_SERVICE: 519 p->upgrade = true; 520 if (len != 0) 521 return -EINVAL; 522 break; 523 524 case RXRPC_TX_LENGTH: 525 if (p->call.tx_total_len != -1 || len != sizeof(__s64)) 526 return -EINVAL; 527 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg); 528 if (p->call.tx_total_len < 0) 529 return -EINVAL; 530 break; 531 532 case RXRPC_SET_CALL_TIMEOUT: 533 if (len & 3 || len < 4 || len > 12) 534 return -EINVAL; 535 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len); 536 p->call.nr_timeouts = len / 4; 537 if (p->call.timeouts.hard > INT_MAX / HZ) 538 return -ERANGE; 539 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000) 540 return -ERANGE; 541 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000) 542 return -ERANGE; 543 break; 544 545 default: 546 return -EINVAL; 547 } 548 } 549 550 if (!got_user_ID) 551 return -EINVAL; 552 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA) 553 return -EINVAL; 554 _leave(" = 0"); 555 return 0; 556 } 557 558 /* 559 * Create a new client call for sendmsg(). 560 * - Called with the socket lock held, which it must release. 561 * - If it returns a call, the call's lock will need releasing by the caller. 562 */ 563 static struct rxrpc_call * 564 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, 565 struct rxrpc_send_params *p) 566 __releases(&rx->sk.sk_lock.slock) 567 __acquires(&call->user_mutex) 568 { 569 struct rxrpc_conn_parameters cp; 570 struct rxrpc_call *call; 571 struct key *key; 572 573 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name); 574 575 _enter(""); 576 577 if (!msg->msg_name) { 578 release_sock(&rx->sk); 579 return ERR_PTR(-EDESTADDRREQ); 580 } 581 582 key = rx->key; 583 if (key && !rx->key->payload.data[0]) 584 key = NULL; 585 586 memset(&cp, 0, sizeof(cp)); 587 cp.local = rx->local; 588 cp.key = rx->key; 589 cp.security_level = rx->min_sec_level; 590 cp.exclusive = rx->exclusive | p->exclusive; 591 cp.upgrade = p->upgrade; 592 cp.service_id = srx->srx_service; 593 call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL, 594 atomic_inc_return(&rxrpc_debug_id)); 595 /* The socket is now unlocked */ 596 597 rxrpc_put_peer(cp.peer); 598 _leave(" = %p\n", call); 599 return call; 600 } 601 602 /* 603 * send a message forming part of a client call through an RxRPC socket 604 * - caller holds the socket locked 605 * - the socket may be either a client socket or a server socket 606 */ 607 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len) 608 __releases(&rx->sk.sk_lock.slock) 609 __releases(&call->user_mutex) 610 { 611 enum rxrpc_call_state state; 612 struct rxrpc_call *call; 613 unsigned long now, j; 614 int ret; 615 616 struct rxrpc_send_params p = { 617 .call.tx_total_len = -1, 618 .call.user_call_ID = 0, 619 .call.nr_timeouts = 0, 620 .abort_code = 0, 621 .command = RXRPC_CMD_SEND_DATA, 622 .exclusive = false, 623 .upgrade = false, 624 }; 625 626 _enter(""); 627 628 ret = rxrpc_sendmsg_cmsg(msg, &p); 629 if (ret < 0) 630 goto error_release_sock; 631 632 if (p.command == RXRPC_CMD_ACCEPT) { 633 ret = -EINVAL; 634 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) 635 goto error_release_sock; 636 call = rxrpc_accept_call(rx, p.call.user_call_ID, NULL); 637 /* The socket is now unlocked. */ 638 if (IS_ERR(call)) 639 return PTR_ERR(call); 640 ret = 0; 641 goto out_put_unlock; 642 } 643 644 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID); 645 if (!call) { 646 ret = -EBADSLT; 647 if (p.command != RXRPC_CMD_SEND_DATA) 648 goto error_release_sock; 649 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p); 650 /* The socket is now unlocked... */ 651 if (IS_ERR(call)) 652 return PTR_ERR(call); 653 /* ... and we have the call lock. */ 654 } else { 655 switch (READ_ONCE(call->state)) { 656 case RXRPC_CALL_UNINITIALISED: 657 case RXRPC_CALL_CLIENT_AWAIT_CONN: 658 case RXRPC_CALL_SERVER_PREALLOC: 659 case RXRPC_CALL_SERVER_SECURING: 660 case RXRPC_CALL_SERVER_ACCEPTING: 661 ret = -EBUSY; 662 goto error_release_sock; 663 default: 664 break; 665 } 666 667 ret = mutex_lock_interruptible(&call->user_mutex); 668 release_sock(&rx->sk); 669 if (ret < 0) { 670 ret = -ERESTARTSYS; 671 goto error_put; 672 } 673 674 if (p.call.tx_total_len != -1) { 675 ret = -EINVAL; 676 if (call->tx_total_len != -1 || 677 call->tx_pending || 678 call->tx_top != 0) 679 goto error_put; 680 call->tx_total_len = p.call.tx_total_len; 681 } 682 } 683 684 switch (p.call.nr_timeouts) { 685 case 3: 686 j = msecs_to_jiffies(p.call.timeouts.normal); 687 if (p.call.timeouts.normal > 0 && j == 0) 688 j = 1; 689 WRITE_ONCE(call->next_rx_timo, j); 690 /* Fall through */ 691 case 2: 692 j = msecs_to_jiffies(p.call.timeouts.idle); 693 if (p.call.timeouts.idle > 0 && j == 0) 694 j = 1; 695 WRITE_ONCE(call->next_req_timo, j); 696 /* Fall through */ 697 case 1: 698 if (p.call.timeouts.hard > 0) { 699 j = msecs_to_jiffies(p.call.timeouts.hard); 700 now = jiffies; 701 j += now; 702 WRITE_ONCE(call->expect_term_by, j); 703 rxrpc_reduce_call_timer(call, j, now, 704 rxrpc_timer_set_for_hard); 705 } 706 break; 707 } 708 709 state = READ_ONCE(call->state); 710 _debug("CALL %d USR %lx ST %d on CONN %p", 711 call->debug_id, call->user_call_ID, state, call->conn); 712 713 if (state >= RXRPC_CALL_COMPLETE) { 714 /* it's too late for this call */ 715 ret = -ESHUTDOWN; 716 } else if (p.command == RXRPC_CMD_SEND_ABORT) { 717 ret = 0; 718 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED)) 719 ret = rxrpc_send_abort_packet(call); 720 } else if (p.command != RXRPC_CMD_SEND_DATA) { 721 ret = -EINVAL; 722 } else if (rxrpc_is_client_call(call) && 723 state != RXRPC_CALL_CLIENT_SEND_REQUEST) { 724 /* request phase complete for this client call */ 725 ret = -EPROTO; 726 } else if (rxrpc_is_service_call(call) && 727 state != RXRPC_CALL_SERVER_ACK_REQUEST && 728 state != RXRPC_CALL_SERVER_SEND_REPLY) { 729 /* Reply phase not begun or not complete for service call. */ 730 ret = -EPROTO; 731 } else { 732 ret = rxrpc_send_data(rx, call, msg, len, NULL); 733 } 734 735 out_put_unlock: 736 mutex_unlock(&call->user_mutex); 737 error_put: 738 rxrpc_put_call(call, rxrpc_call_put); 739 _leave(" = %d", ret); 740 return ret; 741 742 error_release_sock: 743 release_sock(&rx->sk); 744 return ret; 745 } 746 747 /** 748 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call 749 * @sock: The socket the call is on 750 * @call: The call to send data through 751 * @msg: The data to send 752 * @len: The amount of data to send 753 * @notify_end_tx: Notification that the last packet is queued. 754 * 755 * Allow a kernel service to send data on a call. The call must be in an state 756 * appropriate to sending data. No control data should be supplied in @msg, 757 * nor should an address be supplied. MSG_MORE should be flagged if there's 758 * more data to come, otherwise this data will end the transmission phase. 759 */ 760 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call, 761 struct msghdr *msg, size_t len, 762 rxrpc_notify_end_tx_t notify_end_tx) 763 { 764 int ret; 765 766 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); 767 768 ASSERTCMP(msg->msg_name, ==, NULL); 769 ASSERTCMP(msg->msg_control, ==, NULL); 770 771 mutex_lock(&call->user_mutex); 772 773 _debug("CALL %d USR %lx ST %d on CONN %p", 774 call->debug_id, call->user_call_ID, call->state, call->conn); 775 776 switch (READ_ONCE(call->state)) { 777 case RXRPC_CALL_CLIENT_SEND_REQUEST: 778 case RXRPC_CALL_SERVER_ACK_REQUEST: 779 case RXRPC_CALL_SERVER_SEND_REPLY: 780 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len, 781 notify_end_tx); 782 break; 783 case RXRPC_CALL_COMPLETE: 784 read_lock_bh(&call->state_lock); 785 ret = call->error; 786 read_unlock_bh(&call->state_lock); 787 break; 788 default: 789 /* Request phase complete for this client call */ 790 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send")); 791 ret = -EPROTO; 792 break; 793 } 794 795 mutex_unlock(&call->user_mutex); 796 _leave(" = %d", ret); 797 return ret; 798 } 799 EXPORT_SYMBOL(rxrpc_kernel_send_data); 800 801 /** 802 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call 803 * @sock: The socket the call is on 804 * @call: The call to be aborted 805 * @abort_code: The abort code to stick into the ABORT packet 806 * @error: Local error value 807 * @why: 3-char string indicating why. 808 * 809 * Allow a kernel service to abort a call, if it's still in an abortable state 810 * and return true if the call was aborted, false if it was already complete. 811 */ 812 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call, 813 u32 abort_code, int error, const char *why) 814 { 815 bool aborted; 816 817 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why); 818 819 mutex_lock(&call->user_mutex); 820 821 aborted = rxrpc_abort_call(why, call, 0, abort_code, error); 822 if (aborted) 823 rxrpc_send_abort_packet(call); 824 825 mutex_unlock(&call->user_mutex); 826 return aborted; 827 } 828 EXPORT_SYMBOL(rxrpc_kernel_abort_call); 829 830 /** 831 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call 832 * @sock: The socket the call is on 833 * @call: The call to be informed 834 * @tx_total_len: The amount of data to be transmitted for this call 835 * 836 * Allow a kernel service to set the total transmit length on a call. This 837 * allows buffer-to-packet encrypt-and-copy to be performed. 838 * 839 * This function is primarily for use for setting the reply length since the 840 * request length can be set when beginning the call. 841 */ 842 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call, 843 s64 tx_total_len) 844 { 845 WARN_ON(call->tx_total_len != -1); 846 call->tx_total_len = tx_total_len; 847 } 848 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length); 849