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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 | /* RxRPC packet reception * * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/module.h> #include <linux/net.h> #include <linux/skbuff.h> #include <linux/errqueue.h> #include <linux/udp.h> #include <linux/in.h> #include <linux/in6.h> #include <linux/icmp.h> #include <net/sock.h> #include <net/af_rxrpc.h> #include <net/ip.h> #include <net/udp.h> #include "ar-internal.h" unsigned long rxrpc_ack_timeout = 1; const char *rxrpc_pkts[] = { "?00", "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG", "?09", "?10", "?11", "?12", "?13", "?14", "?15" }; /* * queue a packet for recvmsg to pass to userspace * - the caller must hold a lock on call->lock * - must not be called with interrupts disabled (sk_filter() disables BH's) * - eats the packet whether successful or not * - there must be just one reference to the packet, which the caller passes to * this function */ int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb, bool force, bool terminal) { struct rxrpc_skb_priv *sp; struct rxrpc_sock *rx = call->socket; struct sock *sk; int skb_len, ret; _enter(",,%d,%d", force, terminal); ASSERT(!irqs_disabled()); sp = rxrpc_skb(skb); ASSERTCMP(sp->call, ==, call); /* if we've already posted the terminal message for a call, then we * don't post any more */ if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { _debug("already terminated"); ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE); skb->destructor = NULL; sp->call = NULL; rxrpc_put_call(call); rxrpc_free_skb(skb); return 0; } sk = &rx->sk; if (!force) { /* cast skb->rcvbuf to unsigned... It's pointless, but * reduces number of warnings when compiling with -W * --ANK */ // ret = -ENOBUFS; // if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= // (unsigned) sk->sk_rcvbuf) // goto out; ret = sk_filter(sk, skb); if (ret < 0) goto out; } spin_lock_bh(&sk->sk_receive_queue.lock); if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) && !test_bit(RXRPC_CALL_RELEASED, &call->flags) && call->socket->sk.sk_state != RXRPC_CLOSE) { skb->destructor = rxrpc_packet_destructor; skb->dev = NULL; skb->sk = sk; atomic_add(skb->truesize, &sk->sk_rmem_alloc); if (terminal) { _debug("<<<< TERMINAL MESSAGE >>>>"); set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags); } /* allow interception by a kernel service */ if (rx->interceptor) { rx->interceptor(sk, call->user_call_ID, skb); spin_unlock_bh(&sk->sk_receive_queue.lock); } else { /* Cache the SKB length before we tack it onto the * receive queue. Once it is added it no longer * belongs to us and may be freed by other threads of * control pulling packets from the queue */ skb_len = skb->len; _net("post skb %p", skb); __skb_queue_tail(&sk->sk_receive_queue, skb); spin_unlock_bh(&sk->sk_receive_queue.lock); if (!sock_flag(sk, SOCK_DEAD)) sk->sk_data_ready(sk, skb_len); } skb = NULL; } else { spin_unlock_bh(&sk->sk_receive_queue.lock); } ret = 0; out: /* release the socket buffer */ if (skb) { skb->destructor = NULL; sp->call = NULL; rxrpc_put_call(call); rxrpc_free_skb(skb); } _leave(" = %d", ret); return ret; } /* * process a DATA packet, posting the packet to the appropriate queue * - eats the packet if successful */ static int rxrpc_fast_process_data(struct rxrpc_call *call, struct sk_buff *skb, u32 seq) { struct rxrpc_skb_priv *sp; bool terminal; int ret, ackbit, ack; _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq); sp = rxrpc_skb(skb); ASSERTCMP(sp->call, ==, NULL); spin_lock(&call->lock); if (call->state > RXRPC_CALL_COMPLETE) goto discard; ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post); ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv); ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten); if (seq < call->rx_data_post) { _debug("dup #%u [-%u]", seq, call->rx_data_post); ack = RXRPC_ACK_DUPLICATE; ret = -ENOBUFS; goto discard_and_ack; } /* we may already have the packet in the out of sequence queue */ ackbit = seq - (call->rx_data_eaten + 1); ASSERTCMP(ackbit, >=, 0); if (__test_and_set_bit(ackbit, call->ackr_window)) { _debug("dup oos #%u [%u,%u]", seq, call->rx_data_eaten, call->rx_data_post); ack = RXRPC_ACK_DUPLICATE; goto discard_and_ack; } if (seq >= call->ackr_win_top) { _debug("exceed #%u [%u]", seq, call->ackr_win_top); __clear_bit(ackbit, call->ackr_window); ack = RXRPC_ACK_EXCEEDS_WINDOW; goto discard_and_ack; } if (seq == call->rx_data_expect) { clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags); call->rx_data_expect++; } else if (seq > call->rx_data_expect) { _debug("oos #%u [%u]", seq, call->rx_data_expect); call->rx_data_expect = seq + 1; if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) { ack = RXRPC_ACK_OUT_OF_SEQUENCE; goto enqueue_and_ack; } goto enqueue_packet; } if (seq != call->rx_data_post) { _debug("ahead #%u [%u]", seq, call->rx_data_post); goto enqueue_packet; } if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags)) goto protocol_error; /* if the packet need security things doing to it, then it goes down * the slow path */ if (call->conn->security) goto enqueue_packet; sp->call = call; rxrpc_get_call(call); terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); ret = rxrpc_queue_rcv_skb(call, skb, false, terminal); if (ret < 0) { if (ret == -ENOMEM || ret == -ENOBUFS) { __clear_bit(ackbit, call->ackr_window); ack = RXRPC_ACK_NOSPACE; goto discard_and_ack; } goto out; } skb = NULL; _debug("post #%u", seq); ASSERTCMP(call->rx_data_post, ==, seq); call->rx_data_post++; if (sp->hdr.flags & RXRPC_LAST_PACKET) set_bit(RXRPC_CALL_RCVD_LAST, &call->flags); /* if we've reached an out of sequence packet then we need to drain * that queue into the socket Rx queue now */ if (call->rx_data_post == call->rx_first_oos) { _debug("drain rx oos now"); read_lock(&call->state_lock); if (call->state < RXRPC_CALL_COMPLETE && !test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) rxrpc_queue_call(call); read_unlock(&call->state_lock); } spin_unlock(&call->lock); atomic_inc(&call->ackr_not_idle); rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false); _leave(" = 0 [posted]"); return 0; protocol_error: ret = -EBADMSG; out: spin_unlock(&call->lock); _leave(" = %d", ret); return ret; discard_and_ack: _debug("discard and ACK packet %p", skb); __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); discard: spin_unlock(&call->lock); rxrpc_free_skb(skb); _leave(" = 0 [discarded]"); return 0; enqueue_and_ack: __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); enqueue_packet: _net("defer skb %p", skb); spin_unlock(&call->lock); skb_queue_tail(&call->rx_queue, skb); atomic_inc(&call->ackr_not_idle); read_lock(&call->state_lock); if (call->state < RXRPC_CALL_DEAD) rxrpc_queue_call(call); read_unlock(&call->state_lock); _leave(" = 0 [queued]"); return 0; } /* * assume an implicit ACKALL of the transmission phase of a client socket upon * reception of the first reply packet */ static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial) { write_lock_bh(&call->state_lock); switch (call->state) { case RXRPC_CALL_CLIENT_AWAIT_REPLY: call->state = RXRPC_CALL_CLIENT_RECV_REPLY; call->acks_latest = serial; _debug("implicit ACKALL %%%u", call->acks_latest); set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events); write_unlock_bh(&call->state_lock); if (try_to_del_timer_sync(&call->resend_timer) >= 0) { clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); clear_bit(RXRPC_CALL_RESEND, &call->events); clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); } break; default: write_unlock_bh(&call->state_lock); break; } } /* * post an incoming packet to the nominated call to deal with * - must get rid of the sk_buff, either by freeing it or by queuing it */ void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb) { struct rxrpc_skb_priv *sp = rxrpc_skb(skb); __be32 _abort_code; u32 serial, hi_serial, seq, abort_code; _enter("%p,%p", call, skb); ASSERT(!irqs_disabled()); #if 0 // INJECT RX ERROR if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { static int skip = 0; if (++skip == 3) { printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n"); skip = 0; goto free_packet; } } #endif /* track the latest serial number on this connection for ACK packet * information */ serial = ntohl(sp->hdr.serial); hi_serial = atomic_read(&call->conn->hi_serial); while (serial > hi_serial) hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial, serial); /* request ACK generation for any ACK or DATA packet that requests * it */ if (sp->hdr.flags & RXRPC_REQUEST_ACK) { _proto("ACK Requested on %%%u", serial); rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, !(sp->hdr.flags & RXRPC_MORE_PACKETS)); } switch (sp->hdr.type) { case RXRPC_PACKET_TYPE_ABORT: _debug("abort"); if (skb_copy_bits(skb, 0, &_abort_code, sizeof(_abort_code)) < 0) goto protocol_error; abort_code = ntohl(_abort_code); _proto("Rx ABORT %%%u { %x }", serial, abort_code); write_lock_bh(&call->state_lock); if (call->state < RXRPC_CALL_COMPLETE) { call->state = RXRPC_CALL_REMOTELY_ABORTED; call->abort_code = abort_code; set_bit(RXRPC_CALL_RCVD_ABORT, &call->events); rxrpc_queue_call(call); } goto free_packet_unlock; case RXRPC_PACKET_TYPE_BUSY: _proto("Rx BUSY %%%u", serial); if (call->conn->out_clientflag) goto protocol_error; write_lock_bh(&call->state_lock); switch (call->state) { case RXRPC_CALL_CLIENT_SEND_REQUEST: call->state = RXRPC_CALL_SERVER_BUSY; set_bit(RXRPC_CALL_RCVD_BUSY, &call->events); rxrpc_queue_call(call); case RXRPC_CALL_SERVER_BUSY: goto free_packet_unlock; default: goto protocol_error_locked; } default: _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial); goto protocol_error; case RXRPC_PACKET_TYPE_DATA: seq = ntohl(sp->hdr.seq); _proto("Rx DATA %%%u { #%u }", serial, seq); if (seq == 0) goto protocol_error; call->ackr_prev_seq = sp->hdr.seq; /* received data implicitly ACKs all of the request packets we * sent when we're acting as a client */ if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) rxrpc_assume_implicit_ackall(call, serial); switch (rxrpc_fast_process_data(call, skb, seq)) { case 0: skb = NULL; goto done; default: BUG(); /* data packet received beyond the last packet */ case -EBADMSG: goto protocol_error; } case RXRPC_PACKET_TYPE_ACK: /* ACK processing is done in process context */ read_lock_bh(&call->state_lock); if (call->state < RXRPC_CALL_DEAD) { skb_queue_tail(&call->rx_queue, skb); rxrpc_queue_call(call); skb = NULL; } read_unlock_bh(&call->state_lock); goto free_packet; } protocol_error: _debug("protocol error"); write_lock_bh(&call->state_lock); protocol_error_locked: if (call->state <= RXRPC_CALL_COMPLETE) { call->state = RXRPC_CALL_LOCALLY_ABORTED; call->abort_code = RX_PROTOCOL_ERROR; set_bit(RXRPC_CALL_ABORT, &call->events); rxrpc_queue_call(call); } free_packet_unlock: write_unlock_bh(&call->state_lock); free_packet: rxrpc_free_skb(skb); done: _leave(""); } /* * split up a jumbo data packet */ static void rxrpc_process_jumbo_packet(struct rxrpc_call *call, struct sk_buff *jumbo) { struct rxrpc_jumbo_header jhdr; struct rxrpc_skb_priv *sp; struct sk_buff *part; _enter(",{%u,%u}", jumbo->data_len, jumbo->len); sp = rxrpc_skb(jumbo); do { sp->hdr.flags &= ~RXRPC_JUMBO_PACKET; /* make a clone to represent the first subpacket in what's left * of the jumbo packet */ part = skb_clone(jumbo, GFP_ATOMIC); if (!part) { /* simply ditch the tail in the event of ENOMEM */ pskb_trim(jumbo, RXRPC_JUMBO_DATALEN); break; } rxrpc_new_skb(part); pskb_trim(part, RXRPC_JUMBO_DATALEN); if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN)) goto protocol_error; if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0) goto protocol_error; if (!pskb_pull(jumbo, sizeof(jhdr))) BUG(); sp->hdr.seq = htonl(ntohl(sp->hdr.seq) + 1); sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1); sp->hdr.flags = jhdr.flags; sp->hdr._rsvd = jhdr._rsvd; _proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1); rxrpc_fast_process_packet(call, part); part = NULL; } while (sp->hdr.flags & RXRPC_JUMBO_PACKET); rxrpc_fast_process_packet(call, jumbo); _leave(""); return; protocol_error: _debug("protocol error"); rxrpc_free_skb(part); rxrpc_free_skb(jumbo); write_lock_bh(&call->state_lock); if (call->state <= RXRPC_CALL_COMPLETE) { call->state = RXRPC_CALL_LOCALLY_ABORTED; call->abort_code = RX_PROTOCOL_ERROR; set_bit(RXRPC_CALL_ABORT, &call->events); rxrpc_queue_call(call); } write_unlock_bh(&call->state_lock); _leave(""); } /* * post an incoming packet to the appropriate call/socket to deal with * - must get rid of the sk_buff, either by freeing it or by queuing it */ static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn, struct sk_buff *skb) { struct rxrpc_skb_priv *sp; struct rxrpc_call *call; struct rb_node *p; __be32 call_id; _enter("%p,%p", conn, skb); read_lock_bh(&conn->lock); sp = rxrpc_skb(skb); /* look at extant calls by channel number first */ call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK]; if (!call || call->call_id != sp->hdr.callNumber) goto call_not_extant; _debug("extant call [%d]", call->state); ASSERTCMP(call->conn, ==, conn); read_lock(&call->state_lock); switch (call->state) { case RXRPC_CALL_LOCALLY_ABORTED: if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) rxrpc_queue_call(call); case RXRPC_CALL_REMOTELY_ABORTED: case RXRPC_CALL_NETWORK_ERROR: case RXRPC_CALL_DEAD: goto free_unlock; default: break; } read_unlock(&call->state_lock); rxrpc_get_call(call); read_unlock_bh(&conn->lock); if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && sp->hdr.flags & RXRPC_JUMBO_PACKET) rxrpc_process_jumbo_packet(call, skb); else rxrpc_fast_process_packet(call, skb); rxrpc_put_call(call); goto done; call_not_extant: /* search the completed calls in case what we're dealing with is * there */ _debug("call not extant"); call_id = sp->hdr.callNumber; p = conn->calls.rb_node; while (p) { call = rb_entry(p, struct rxrpc_call, conn_node); if (call_id < call->call_id) p = p->rb_left; else if (call_id > call->call_id) p = p->rb_right; else goto found_completed_call; } dead_call: /* it's a either a really old call that we no longer remember or its a * new incoming call */ read_unlock_bh(&conn->lock); if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && sp->hdr.seq == cpu_to_be32(1)) { _debug("incoming call"); skb_queue_tail(&conn->trans->local->accept_queue, skb); rxrpc_queue_work(&conn->trans->local->acceptor); goto done; } _debug("dead call"); skb->priority = RX_CALL_DEAD; rxrpc_reject_packet(conn->trans->local, skb); goto done; /* resend last packet of a completed call * - client calls may have been aborted or ACK'd * - server calls may have been aborted */ found_completed_call: _debug("completed call"); if (atomic_read(&call->usage) == 0) goto dead_call; /* synchronise any state changes */ read_lock(&call->state_lock); ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK, call->state, >=, RXRPC_CALL_COMPLETE); if (call->state == RXRPC_CALL_LOCALLY_ABORTED || call->state == RXRPC_CALL_REMOTELY_ABORTED || call->state == RXRPC_CALL_DEAD) { read_unlock(&call->state_lock); goto dead_call; } if (call->conn->in_clientflag) { read_unlock(&call->state_lock); goto dead_call; /* complete server call */ } _debug("final ack again"); rxrpc_get_call(call); set_bit(RXRPC_CALL_ACK_FINAL, &call->events); rxrpc_queue_call(call); free_unlock: read_unlock(&call->state_lock); read_unlock_bh(&conn->lock); rxrpc_free_skb(skb); done: _leave(""); } /* * post connection-level events to the connection * - this includes challenges, responses and some aborts */ static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, struct sk_buff *skb) { _enter("%p,%p", conn, skb); atomic_inc(&conn->usage); skb_queue_tail(&conn->rx_queue, skb); rxrpc_queue_conn(conn); } /* * handle data received on the local endpoint * - may be called in interrupt context */ void rxrpc_data_ready(struct sock *sk, int count) { struct rxrpc_connection *conn; struct rxrpc_transport *trans; struct rxrpc_skb_priv *sp; struct rxrpc_local *local; struct rxrpc_peer *peer; struct sk_buff *skb; int ret; _enter("%p, %d", sk, count); ASSERT(!irqs_disabled()); read_lock_bh(&rxrpc_local_lock); local = sk->sk_user_data; if (local && atomic_read(&local->usage) > 0) rxrpc_get_local(local); else local = NULL; read_unlock_bh(&rxrpc_local_lock); if (!local) { _leave(" [local dead]"); return; } skb = skb_recv_datagram(sk, 0, 1, &ret); if (!skb) { rxrpc_put_local(local); if (ret == -EAGAIN) return; _debug("UDP socket error %d", ret); return; } rxrpc_new_skb(skb); _net("recv skb %p", skb); /* we'll probably need to checksum it (didn't call sock_recvmsg) */ if (skb_checksum_complete(skb)) { rxrpc_free_skb(skb); rxrpc_put_local(local); UDP_INC_STATS_BH(UDP_MIB_INERRORS, 0); _leave(" [CSUM failed]"); return; } UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, 0); /* the socket buffer we have is owned by UDP, with UDP's data all over * it, but we really want our own */ skb_orphan(skb); sp = rxrpc_skb(skb); memset(sp, 0, sizeof(*sp)); _net("Rx UDP packet from %08x:%04hu", ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source)); /* dig out the RxRPC connection details */ if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr, sizeof(sp->hdr)) < 0) goto bad_message; if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr))) BUG(); _net("Rx RxRPC %s ep=%x call=%x:%x", sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", ntohl(sp->hdr.epoch), ntohl(sp->hdr.cid), ntohl(sp->hdr.callNumber)); if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) { _proto("Rx Bad Packet Type %u", sp->hdr.type); goto bad_message; } if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && (sp->hdr.callNumber == 0 || sp->hdr.seq == 0)) goto bad_message; peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source); if (IS_ERR(peer)) goto cant_route_call; trans = rxrpc_find_transport(local, peer); rxrpc_put_peer(peer); if (!trans) goto cant_route_call; conn = rxrpc_find_connection(trans, &sp->hdr); rxrpc_put_transport(trans); if (!conn) goto cant_route_call; _debug("CONN %p {%d}", conn, conn->debug_id); if (sp->hdr.callNumber == 0) rxrpc_post_packet_to_conn(conn, skb); else rxrpc_post_packet_to_call(conn, skb); rxrpc_put_connection(conn); rxrpc_put_local(local); return; cant_route_call: _debug("can't route call"); if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { if (sp->hdr.seq == cpu_to_be32(1)) { _debug("first packet"); skb_queue_tail(&local->accept_queue, skb); rxrpc_queue_work(&local->acceptor); rxrpc_put_local(local); _leave(" [incoming]"); return; } skb->priority = RX_INVALID_OPERATION; } else { skb->priority = RX_CALL_DEAD; } _debug("reject"); rxrpc_reject_packet(local, skb); rxrpc_put_local(local); _leave(" [no call]"); return; bad_message: skb->priority = RX_PROTOCOL_ERROR; rxrpc_reject_packet(local, skb); rxrpc_put_local(local); _leave(" [badmsg]"); } |