socket.c revision 05790c6456f144024e655710347b3df499260374
1/* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2006, Ericsson AB 5 * Copyright (c) 2004-2005, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37#include <linux/module.h> 38#include <linux/types.h> 39#include <linux/net.h> 40#include <linux/socket.h> 41#include <linux/errno.h> 42#include <linux/mm.h> 43#include <linux/slab.h> 44#include <linux/poll.h> 45#include <linux/fcntl.h> 46#include <asm/semaphore.h> 47#include <asm/string.h> 48#include <asm/atomic.h> 49#include <net/sock.h> 50 51#include <linux/tipc.h> 52#include <linux/tipc_config.h> 53#include <net/tipc/tipc_msg.h> 54#include <net/tipc/tipc_port.h> 55 56#include "core.h" 57 58#define SS_LISTENING -1 /* socket is listening */ 59#define SS_READY -2 /* socket is connectionless */ 60 61#define OVERLOAD_LIMIT_BASE 5000 62 63struct tipc_sock { 64 struct sock sk; 65 struct tipc_port *p; 66 struct semaphore sem; 67}; 68 69#define tipc_sk(sk) ((struct tipc_sock*)sk) 70 71static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); 72static void wakeupdispatch(struct tipc_port *tport); 73 74static struct proto_ops packet_ops; 75static struct proto_ops stream_ops; 76static struct proto_ops msg_ops; 77 78static struct proto tipc_proto; 79 80static int sockets_enabled = 0; 81 82static atomic_t tipc_queue_size = ATOMIC_INIT(0); 83 84 85/* 86 * sock_lock(): Lock a port/socket pair. lock_sock() can 87 * not be used here, since the same lock must protect ports 88 * with non-socket interfaces. 89 * See net.c for description of locking policy. 90 */ 91static void sock_lock(struct tipc_sock* tsock) 92{ 93 spin_lock_bh(tsock->p->lock); 94} 95 96/* 97 * sock_unlock(): Unlock a port/socket pair 98 */ 99static void sock_unlock(struct tipc_sock* tsock) 100{ 101 spin_unlock_bh(tsock->p->lock); 102} 103 104/** 105 * pollmask - determine the current set of poll() events for a socket 106 * @sock: socket structure 107 * 108 * TIPC sets the returned events as follows: 109 * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty 110 * or if a connection-oriented socket is does not have an active connection 111 * (i.e. a read operation will not block). 112 * b) POLLOUT is set except when a socket's connection has been terminated 113 * (i.e. a write operation will not block). 114 * c) POLLHUP is set when a socket's connection has been terminated. 115 * 116 * IMPORTANT: The fact that a read or write operation will not block does NOT 117 * imply that the operation will succeed! 118 * 119 * Returns pollmask value 120 */ 121 122static u32 pollmask(struct socket *sock) 123{ 124 u32 mask; 125 126 if ((skb_queue_len(&sock->sk->sk_receive_queue) != 0) || 127 (sock->state == SS_UNCONNECTED) || 128 (sock->state == SS_DISCONNECTING)) 129 mask = (POLLRDNORM | POLLIN); 130 else 131 mask = 0; 132 133 if (sock->state == SS_DISCONNECTING) 134 mask |= POLLHUP; 135 else 136 mask |= POLLOUT; 137 138 return mask; 139} 140 141 142/** 143 * advance_queue - discard first buffer in queue 144 * @tsock: TIPC socket 145 */ 146 147static void advance_queue(struct tipc_sock *tsock) 148{ 149 sock_lock(tsock); 150 buf_discard(skb_dequeue(&tsock->sk.sk_receive_queue)); 151 sock_unlock(tsock); 152 atomic_dec(&tipc_queue_size); 153} 154 155/** 156 * tipc_create - create a TIPC socket 157 * @sock: pre-allocated socket structure 158 * @protocol: protocol indicator (must be 0) 159 * 160 * This routine creates and attaches a 'struct sock' to the 'struct socket', 161 * then create and attaches a TIPC port to the 'struct sock' part. 162 * 163 * Returns 0 on success, errno otherwise 164 */ 165static int tipc_create(struct socket *sock, int protocol) 166{ 167 struct tipc_sock *tsock; 168 struct tipc_port *port; 169 struct sock *sk; 170 u32 ref; 171 172 if ((sock->type != SOCK_STREAM) && 173 (sock->type != SOCK_SEQPACKET) && 174 (sock->type != SOCK_DGRAM) && 175 (sock->type != SOCK_RDM)) 176 return -EPROTOTYPE; 177 178 if (unlikely(protocol != 0)) 179 return -EPROTONOSUPPORT; 180 181 ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE); 182 if (unlikely(!ref)) 183 return -ENOMEM; 184 185 sock->state = SS_UNCONNECTED; 186 187 switch (sock->type) { 188 case SOCK_STREAM: 189 sock->ops = &stream_ops; 190 break; 191 case SOCK_SEQPACKET: 192 sock->ops = &packet_ops; 193 break; 194 case SOCK_DGRAM: 195 tipc_set_portunreliable(ref, 1); 196 /* fall through */ 197 case SOCK_RDM: 198 tipc_set_portunreturnable(ref, 1); 199 sock->ops = &msg_ops; 200 sock->state = SS_READY; 201 break; 202 } 203 204 sk = sk_alloc(AF_TIPC, GFP_KERNEL, &tipc_proto, 1); 205 if (!sk) { 206 tipc_deleteport(ref); 207 return -ENOMEM; 208 } 209 210 sock_init_data(sock, sk); 211 init_waitqueue_head(sk->sk_sleep); 212 sk->sk_rcvtimeo = 8 * HZ; /* default connect timeout = 8s */ 213 214 tsock = tipc_sk(sk); 215 port = tipc_get_port(ref); 216 217 tsock->p = port; 218 port->usr_handle = tsock; 219 220 init_MUTEX(&tsock->sem); 221 222 dbg("sock_create: %x\n",tsock); 223 224 atomic_inc(&tipc_user_count); 225 226 return 0; 227} 228 229/** 230 * release - destroy a TIPC socket 231 * @sock: socket to destroy 232 * 233 * This routine cleans up any messages that are still queued on the socket. 234 * For DGRAM and RDM socket types, all queued messages are rejected. 235 * For SEQPACKET and STREAM socket types, the first message is rejected 236 * and any others are discarded. (If the first message on a STREAM socket 237 * is partially-read, it is discarded and the next one is rejected instead.) 238 * 239 * NOTE: Rejected messages are not necessarily returned to the sender! They 240 * are returned or discarded according to the "destination droppable" setting 241 * specified for the message by the sender. 242 * 243 * Returns 0 on success, errno otherwise 244 */ 245 246static int release(struct socket *sock) 247{ 248 struct tipc_sock *tsock = tipc_sk(sock->sk); 249 struct sock *sk = sock->sk; 250 int res = TIPC_OK; 251 struct sk_buff *buf; 252 253 dbg("sock_delete: %x\n",tsock); 254 if (!tsock) 255 return 0; 256 down_interruptible(&tsock->sem); 257 if (!sock->sk) { 258 up(&tsock->sem); 259 return 0; 260 } 261 262 /* Reject unreceived messages, unless no longer connected */ 263 264 while (sock->state != SS_DISCONNECTING) { 265 sock_lock(tsock); 266 buf = skb_dequeue(&sk->sk_receive_queue); 267 if (!buf) 268 tsock->p->usr_handle = NULL; 269 sock_unlock(tsock); 270 if (!buf) 271 break; 272 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) 273 buf_discard(buf); 274 else 275 tipc_reject_msg(buf, TIPC_ERR_NO_PORT); 276 atomic_dec(&tipc_queue_size); 277 } 278 279 /* Delete TIPC port */ 280 281 res = tipc_deleteport(tsock->p->ref); 282 sock->sk = NULL; 283 284 /* Discard any remaining messages */ 285 286 while ((buf = skb_dequeue(&sk->sk_receive_queue))) { 287 buf_discard(buf); 288 atomic_dec(&tipc_queue_size); 289 } 290 291 up(&tsock->sem); 292 293 sock_put(sk); 294 295 atomic_dec(&tipc_user_count); 296 return res; 297} 298 299/** 300 * bind - associate or disassocate TIPC name(s) with a socket 301 * @sock: socket structure 302 * @uaddr: socket address describing name(s) and desired operation 303 * @uaddr_len: size of socket address data structure 304 * 305 * Name and name sequence binding is indicated using a positive scope value; 306 * a negative scope value unbinds the specified name. Specifying no name 307 * (i.e. a socket address length of 0) unbinds all names from the socket. 308 * 309 * Returns 0 on success, errno otherwise 310 */ 311 312static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) 313{ 314 struct tipc_sock *tsock = tipc_sk(sock->sk); 315 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 316 int res; 317 318 if (down_interruptible(&tsock->sem)) 319 return -ERESTARTSYS; 320 321 if (unlikely(!uaddr_len)) { 322 res = tipc_withdraw(tsock->p->ref, 0, NULL); 323 goto exit; 324 } 325 326 if (uaddr_len < sizeof(struct sockaddr_tipc)) { 327 res = -EINVAL; 328 goto exit; 329 } 330 331 if (addr->family != AF_TIPC) { 332 res = -EAFNOSUPPORT; 333 goto exit; 334 } 335 if (addr->addrtype == TIPC_ADDR_NAME) 336 addr->addr.nameseq.upper = addr->addr.nameseq.lower; 337 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { 338 res = -EAFNOSUPPORT; 339 goto exit; 340 } 341 342 if (addr->scope > 0) 343 res = tipc_publish(tsock->p->ref, addr->scope, 344 &addr->addr.nameseq); 345 else 346 res = tipc_withdraw(tsock->p->ref, -addr->scope, 347 &addr->addr.nameseq); 348exit: 349 up(&tsock->sem); 350 return res; 351} 352 353/** 354 * get_name - get port ID of socket or peer socket 355 * @sock: socket structure 356 * @uaddr: area for returned socket address 357 * @uaddr_len: area for returned length of socket address 358 * @peer: 0 to obtain socket name, 1 to obtain peer socket name 359 * 360 * Returns 0 on success, errno otherwise 361 */ 362 363static int get_name(struct socket *sock, struct sockaddr *uaddr, 364 int *uaddr_len, int peer) 365{ 366 struct tipc_sock *tsock = tipc_sk(sock->sk); 367 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 368 u32 res; 369 370 if (down_interruptible(&tsock->sem)) 371 return -ERESTARTSYS; 372 373 *uaddr_len = sizeof(*addr); 374 addr->addrtype = TIPC_ADDR_ID; 375 addr->family = AF_TIPC; 376 addr->scope = 0; 377 if (peer) 378 res = tipc_peer(tsock->p->ref, &addr->addr.id); 379 else 380 res = tipc_ownidentity(tsock->p->ref, &addr->addr.id); 381 addr->addr.name.domain = 0; 382 383 up(&tsock->sem); 384 return res; 385} 386 387/** 388 * poll - read and possibly block on pollmask 389 * @file: file structure associated with the socket 390 * @sock: socket for which to calculate the poll bits 391 * @wait: ??? 392 * 393 * Returns the pollmask 394 */ 395 396static unsigned int poll(struct file *file, struct socket *sock, 397 poll_table *wait) 398{ 399 poll_wait(file, sock->sk->sk_sleep, wait); 400 /* NEED LOCK HERE? */ 401 return pollmask(sock); 402} 403 404/** 405 * dest_name_check - verify user is permitted to send to specified port name 406 * @dest: destination address 407 * @m: descriptor for message to be sent 408 * 409 * Prevents restricted configuration commands from being issued by 410 * unauthorized users. 411 * 412 * Returns 0 if permission is granted, otherwise errno 413 */ 414 415static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) 416{ 417 struct tipc_cfg_msg_hdr hdr; 418 419 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) 420 return 0; 421 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) 422 return 0; 423 424 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) 425 return -EACCES; 426 427 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) 428 return -EFAULT; 429 if ((ntohs(hdr.tcm_type) & 0xC000) & (!capable(CAP_NET_ADMIN))) 430 return -EACCES; 431 432 return 0; 433} 434 435/** 436 * send_msg - send message in connectionless manner 437 * @iocb: (unused) 438 * @sock: socket structure 439 * @m: message to send 440 * @total_len: (unused) 441 * 442 * Message must have an destination specified explicitly. 443 * Used for SOCK_RDM and SOCK_DGRAM messages, 444 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 445 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 446 * 447 * Returns the number of bytes sent on success, or errno otherwise 448 */ 449 450static int send_msg(struct kiocb *iocb, struct socket *sock, 451 struct msghdr *m, size_t total_len) 452{ 453 struct tipc_sock *tsock = tipc_sk(sock->sk); 454 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; 455 struct sk_buff *buf; 456 int needs_conn; 457 int res = -EINVAL; 458 459 if (unlikely(!dest)) 460 return -EDESTADDRREQ; 461 if (unlikely(dest->family != AF_TIPC)) 462 return -EINVAL; 463 464 needs_conn = (sock->state != SS_READY); 465 if (unlikely(needs_conn)) { 466 if (sock->state == SS_LISTENING) 467 return -EPIPE; 468 if (sock->state != SS_UNCONNECTED) 469 return -EISCONN; 470 if ((tsock->p->published) || 471 ((sock->type == SOCK_STREAM) && (total_len != 0))) 472 return -EOPNOTSUPP; 473 } 474 475 if (down_interruptible(&tsock->sem)) 476 return -ERESTARTSYS; 477 478 if (needs_conn) { 479 480 /* Abort any pending connection attempts (very unlikely) */ 481 482 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { 483 tipc_reject_msg(buf, TIPC_ERR_NO_PORT); 484 atomic_dec(&tipc_queue_size); 485 } 486 487 sock->state = SS_CONNECTING; 488 } 489 490 do { 491 if (dest->addrtype == TIPC_ADDR_NAME) { 492 if ((res = dest_name_check(dest, m))) 493 goto exit; 494 res = tipc_send2name(tsock->p->ref, 495 &dest->addr.name.name, 496 dest->addr.name.domain, 497 m->msg_iovlen, 498 m->msg_iov); 499 } 500 else if (dest->addrtype == TIPC_ADDR_ID) { 501 res = tipc_send2port(tsock->p->ref, 502 &dest->addr.id, 503 m->msg_iovlen, 504 m->msg_iov); 505 } 506 else if (dest->addrtype == TIPC_ADDR_MCAST) { 507 if (needs_conn) { 508 res = -EOPNOTSUPP; 509 goto exit; 510 } 511 if ((res = dest_name_check(dest, m))) 512 goto exit; 513 res = tipc_multicast(tsock->p->ref, 514 &dest->addr.nameseq, 515 0, 516 m->msg_iovlen, 517 m->msg_iov); 518 } 519 if (likely(res != -ELINKCONG)) { 520exit: 521 up(&tsock->sem); 522 return res; 523 } 524 if (m->msg_flags & MSG_DONTWAIT) { 525 res = -EWOULDBLOCK; 526 goto exit; 527 } 528 if (wait_event_interruptible(*sock->sk->sk_sleep, 529 !tsock->p->congested)) { 530 res = -ERESTARTSYS; 531 goto exit; 532 } 533 } while (1); 534} 535 536/** 537 * send_packet - send a connection-oriented message 538 * @iocb: (unused) 539 * @sock: socket structure 540 * @m: message to send 541 * @total_len: (unused) 542 * 543 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. 544 * 545 * Returns the number of bytes sent on success, or errno otherwise 546 */ 547 548static int send_packet(struct kiocb *iocb, struct socket *sock, 549 struct msghdr *m, size_t total_len) 550{ 551 struct tipc_sock *tsock = tipc_sk(sock->sk); 552 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; 553 int res; 554 555 /* Handle implied connection establishment */ 556 557 if (unlikely(dest)) 558 return send_msg(iocb, sock, m, total_len); 559 560 if (down_interruptible(&tsock->sem)) { 561 return -ERESTARTSYS; 562 } 563 564 if (unlikely(sock->state != SS_CONNECTED)) { 565 if (sock->state == SS_DISCONNECTING) 566 res = -EPIPE; 567 else 568 res = -ENOTCONN; 569 goto exit; 570 } 571 572 do { 573 res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov); 574 if (likely(res != -ELINKCONG)) { 575exit: 576 up(&tsock->sem); 577 return res; 578 } 579 if (m->msg_flags & MSG_DONTWAIT) { 580 res = -EWOULDBLOCK; 581 goto exit; 582 } 583 if (wait_event_interruptible(*sock->sk->sk_sleep, 584 !tsock->p->congested)) { 585 res = -ERESTARTSYS; 586 goto exit; 587 } 588 } while (1); 589} 590 591/** 592 * send_stream - send stream-oriented data 593 * @iocb: (unused) 594 * @sock: socket structure 595 * @m: data to send 596 * @total_len: total length of data to be sent 597 * 598 * Used for SOCK_STREAM data. 599 * 600 * Returns the number of bytes sent on success, or errno otherwise 601 */ 602 603 604static int send_stream(struct kiocb *iocb, struct socket *sock, 605 struct msghdr *m, size_t total_len) 606{ 607 struct msghdr my_msg; 608 struct iovec my_iov; 609 struct iovec *curr_iov; 610 int curr_iovlen; 611 char __user *curr_start; 612 int curr_left; 613 int bytes_to_send; 614 int res; 615 616 if (likely(total_len <= TIPC_MAX_USER_MSG_SIZE)) 617 return send_packet(iocb, sock, m, total_len); 618 619 /* Can only send large data streams if already connected */ 620 621 if (unlikely(sock->state != SS_CONNECTED)) { 622 if (sock->state == SS_DISCONNECTING) 623 return -EPIPE; 624 else 625 return -ENOTCONN; 626 } 627 628 /* 629 * Send each iovec entry using one or more messages 630 * 631 * Note: This algorithm is good for the most likely case 632 * (i.e. one large iovec entry), but could be improved to pass sets 633 * of small iovec entries into send_packet(). 634 */ 635 636 my_msg = *m; 637 curr_iov = my_msg.msg_iov; 638 curr_iovlen = my_msg.msg_iovlen; 639 my_msg.msg_iov = &my_iov; 640 my_msg.msg_iovlen = 1; 641 642 while (curr_iovlen--) { 643 curr_start = curr_iov->iov_base; 644 curr_left = curr_iov->iov_len; 645 646 while (curr_left) { 647 bytes_to_send = (curr_left < TIPC_MAX_USER_MSG_SIZE) 648 ? curr_left : TIPC_MAX_USER_MSG_SIZE; 649 my_iov.iov_base = curr_start; 650 my_iov.iov_len = bytes_to_send; 651 if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0) 652 return res; 653 curr_left -= bytes_to_send; 654 curr_start += bytes_to_send; 655 } 656 657 curr_iov++; 658 } 659 660 return total_len; 661} 662 663/** 664 * auto_connect - complete connection setup to a remote port 665 * @sock: socket structure 666 * @tsock: TIPC-specific socket structure 667 * @msg: peer's response message 668 * 669 * Returns 0 on success, errno otherwise 670 */ 671 672static int auto_connect(struct socket *sock, struct tipc_sock *tsock, 673 struct tipc_msg *msg) 674{ 675 struct tipc_portid peer; 676 677 if (msg_errcode(msg)) { 678 sock->state = SS_DISCONNECTING; 679 return -ECONNREFUSED; 680 } 681 682 peer.ref = msg_origport(msg); 683 peer.node = msg_orignode(msg); 684 tipc_connect2port(tsock->p->ref, &peer); 685 tipc_set_portimportance(tsock->p->ref, msg_importance(msg)); 686 sock->state = SS_CONNECTED; 687 return 0; 688} 689 690/** 691 * set_orig_addr - capture sender's address for received message 692 * @m: descriptor for message info 693 * @msg: received message header 694 * 695 * Note: Address is not captured if not requested by receiver. 696 */ 697 698static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) 699{ 700 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; 701 702 if (addr) { 703 addr->family = AF_TIPC; 704 addr->addrtype = TIPC_ADDR_ID; 705 addr->addr.id.ref = msg_origport(msg); 706 addr->addr.id.node = msg_orignode(msg); 707 addr->addr.name.domain = 0; /* could leave uninitialized */ 708 addr->scope = 0; /* could leave uninitialized */ 709 m->msg_namelen = sizeof(struct sockaddr_tipc); 710 } 711} 712 713/** 714 * anc_data_recv - optionally capture ancillary data for received message 715 * @m: descriptor for message info 716 * @msg: received message header 717 * @tport: TIPC port associated with message 718 * 719 * Note: Ancillary data is not captured if not requested by receiver. 720 * 721 * Returns 0 if successful, otherwise errno 722 */ 723 724static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, 725 struct tipc_port *tport) 726{ 727 u32 anc_data[3]; 728 u32 err; 729 u32 dest_type; 730 int res; 731 732 if (likely(m->msg_controllen == 0)) 733 return 0; 734 735 /* Optionally capture errored message object(s) */ 736 737 err = msg ? msg_errcode(msg) : 0; 738 if (unlikely(err)) { 739 anc_data[0] = err; 740 anc_data[1] = msg_data_sz(msg); 741 if ((res = put_cmsg(m, SOL_SOCKET, TIPC_ERRINFO, 8, anc_data))) 742 return res; 743 if (anc_data[1] && 744 (res = put_cmsg(m, SOL_SOCKET, TIPC_RETDATA, anc_data[1], 745 msg_data(msg)))) 746 return res; 747 } 748 749 /* Optionally capture message destination object */ 750 751 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 752 switch (dest_type) { 753 case TIPC_NAMED_MSG: 754 anc_data[0] = msg_nametype(msg); 755 anc_data[1] = msg_namelower(msg); 756 anc_data[2] = msg_namelower(msg); 757 break; 758 case TIPC_MCAST_MSG: 759 anc_data[0] = msg_nametype(msg); 760 anc_data[1] = msg_namelower(msg); 761 anc_data[2] = msg_nameupper(msg); 762 break; 763 case TIPC_CONN_MSG: 764 anc_data[0] = tport->conn_type; 765 anc_data[1] = tport->conn_instance; 766 anc_data[2] = tport->conn_instance; 767 break; 768 default: 769 anc_data[0] = 0; 770 } 771 if (anc_data[0] && 772 (res = put_cmsg(m, SOL_SOCKET, TIPC_DESTNAME, 12, anc_data))) 773 return res; 774 775 return 0; 776} 777 778/** 779 * recv_msg - receive packet-oriented message 780 * @iocb: (unused) 781 * @m: descriptor for message info 782 * @buf_len: total size of user buffer area 783 * @flags: receive flags 784 * 785 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 786 * If the complete message doesn't fit in user area, truncate it. 787 * 788 * Returns size of returned message data, errno otherwise 789 */ 790 791static int recv_msg(struct kiocb *iocb, struct socket *sock, 792 struct msghdr *m, size_t buf_len, int flags) 793{ 794 struct tipc_sock *tsock = tipc_sk(sock->sk); 795 struct sk_buff *buf; 796 struct tipc_msg *msg; 797 unsigned int q_len; 798 unsigned int sz; 799 u32 err; 800 int res; 801 802 /* Currently doesn't support receiving into multiple iovec entries */ 803 804 if (m->msg_iovlen != 1) 805 return -EOPNOTSUPP; 806 807 /* Catch invalid receive attempts */ 808 809 if (unlikely(!buf_len)) 810 return -EINVAL; 811 812 if (sock->type == SOCK_SEQPACKET) { 813 if (unlikely(sock->state == SS_UNCONNECTED)) 814 return -ENOTCONN; 815 if (unlikely((sock->state == SS_DISCONNECTING) && 816 (skb_queue_len(&sock->sk->sk_receive_queue) == 0))) 817 return -ENOTCONN; 818 } 819 820 /* Look for a message in receive queue; wait if necessary */ 821 822 if (unlikely(down_interruptible(&tsock->sem))) 823 return -ERESTARTSYS; 824 825restart: 826 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && 827 (flags & MSG_DONTWAIT))) { 828 res = -EWOULDBLOCK; 829 goto exit; 830 } 831 832 if ((res = wait_event_interruptible( 833 *sock->sk->sk_sleep, 834 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) || 835 (sock->state == SS_DISCONNECTING))) )) { 836 goto exit; 837 } 838 839 /* Catch attempt to receive on an already terminated connection */ 840 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */ 841 842 if (!q_len) { 843 res = -ENOTCONN; 844 goto exit; 845 } 846 847 /* Get access to first message in receive queue */ 848 849 buf = skb_peek(&sock->sk->sk_receive_queue); 850 msg = buf_msg(buf); 851 sz = msg_data_sz(msg); 852 err = msg_errcode(msg); 853 854 /* Complete connection setup for an implied connect */ 855 856 if (unlikely(sock->state == SS_CONNECTING)) { 857 if ((res = auto_connect(sock, tsock, msg))) 858 goto exit; 859 } 860 861 /* Discard an empty non-errored message & try again */ 862 863 if ((!sz) && (!err)) { 864 advance_queue(tsock); 865 goto restart; 866 } 867 868 /* Capture sender's address (optional) */ 869 870 set_orig_addr(m, msg); 871 872 /* Capture ancillary data (optional) */ 873 874 if ((res = anc_data_recv(m, msg, tsock->p))) 875 goto exit; 876 877 /* Capture message data (if valid) & compute return value (always) */ 878 879 if (!err) { 880 if (unlikely(buf_len < sz)) { 881 sz = buf_len; 882 m->msg_flags |= MSG_TRUNC; 883 } 884 if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg), 885 sz))) { 886 res = -EFAULT; 887 goto exit; 888 } 889 res = sz; 890 } else { 891 if ((sock->state == SS_READY) || 892 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) 893 res = 0; 894 else 895 res = -ECONNRESET; 896 } 897 898 /* Consume received message (optional) */ 899 900 if (likely(!(flags & MSG_PEEK))) { 901 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) 902 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked); 903 advance_queue(tsock); 904 } 905exit: 906 up(&tsock->sem); 907 return res; 908} 909 910/** 911 * recv_stream - receive stream-oriented data 912 * @iocb: (unused) 913 * @m: descriptor for message info 914 * @buf_len: total size of user buffer area 915 * @flags: receive flags 916 * 917 * Used for SOCK_STREAM messages only. If not enough data is available 918 * will optionally wait for more; never truncates data. 919 * 920 * Returns size of returned message data, errno otherwise 921 */ 922 923static int recv_stream(struct kiocb *iocb, struct socket *sock, 924 struct msghdr *m, size_t buf_len, int flags) 925{ 926 struct tipc_sock *tsock = tipc_sk(sock->sk); 927 struct sk_buff *buf; 928 struct tipc_msg *msg; 929 unsigned int q_len; 930 unsigned int sz; 931 int sz_to_copy; 932 int sz_copied = 0; 933 int needed; 934 char *crs = m->msg_iov->iov_base; 935 unsigned char *buf_crs; 936 u32 err; 937 int res; 938 939 /* Currently doesn't support receiving into multiple iovec entries */ 940 941 if (m->msg_iovlen != 1) 942 return -EOPNOTSUPP; 943 944 /* Catch invalid receive attempts */ 945 946 if (unlikely(!buf_len)) 947 return -EINVAL; 948 949 if (unlikely(sock->state == SS_DISCONNECTING)) { 950 if (skb_queue_len(&sock->sk->sk_receive_queue) == 0) 951 return -ENOTCONN; 952 } else if (unlikely(sock->state != SS_CONNECTED)) 953 return -ENOTCONN; 954 955 /* Look for a message in receive queue; wait if necessary */ 956 957 if (unlikely(down_interruptible(&tsock->sem))) 958 return -ERESTARTSYS; 959 960restart: 961 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && 962 (flags & MSG_DONTWAIT))) { 963 res = (sz_copied == 0) ? -EWOULDBLOCK : 0; 964 goto exit; 965 } 966 967 if ((res = wait_event_interruptible( 968 *sock->sk->sk_sleep, 969 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) || 970 (sock->state == SS_DISCONNECTING))) )) { 971 goto exit; 972 } 973 974 /* Catch attempt to receive on an already terminated connection */ 975 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */ 976 977 if (!q_len) { 978 res = -ENOTCONN; 979 goto exit; 980 } 981 982 /* Get access to first message in receive queue */ 983 984 buf = skb_peek(&sock->sk->sk_receive_queue); 985 msg = buf_msg(buf); 986 sz = msg_data_sz(msg); 987 err = msg_errcode(msg); 988 989 /* Discard an empty non-errored message & try again */ 990 991 if ((!sz) && (!err)) { 992 advance_queue(tsock); 993 goto restart; 994 } 995 996 /* Optionally capture sender's address & ancillary data of first msg */ 997 998 if (sz_copied == 0) { 999 set_orig_addr(m, msg); 1000 if ((res = anc_data_recv(m, msg, tsock->p))) 1001 goto exit; 1002 } 1003 1004 /* Capture message data (if valid) & compute return value (always) */ 1005 1006 if (!err) { 1007 buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle); 1008 sz = buf->tail - buf_crs; 1009 1010 needed = (buf_len - sz_copied); 1011 sz_to_copy = (sz <= needed) ? sz : needed; 1012 if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) { 1013 res = -EFAULT; 1014 goto exit; 1015 } 1016 sz_copied += sz_to_copy; 1017 1018 if (sz_to_copy < sz) { 1019 if (!(flags & MSG_PEEK)) 1020 TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy; 1021 goto exit; 1022 } 1023 1024 crs += sz_to_copy; 1025 } else { 1026 if (sz_copied != 0) 1027 goto exit; /* can't add error msg to valid data */ 1028 1029 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) 1030 res = 0; 1031 else 1032 res = -ECONNRESET; 1033 } 1034 1035 /* Consume received message (optional) */ 1036 1037 if (likely(!(flags & MSG_PEEK))) { 1038 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) 1039 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked); 1040 advance_queue(tsock); 1041 } 1042 1043 /* Loop around if more data is required */ 1044 1045 if ((sz_copied < buf_len) /* didn't get all requested data */ 1046 && (flags & MSG_WAITALL) /* ... and need to wait for more */ 1047 && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */ 1048 && (!err) /* ... and haven't reached a FIN */ 1049 ) 1050 goto restart; 1051 1052exit: 1053 up(&tsock->sem); 1054 return res ? res : sz_copied; 1055} 1056 1057/** 1058 * queue_overloaded - test if queue overload condition exists 1059 * @queue_size: current size of queue 1060 * @base: nominal maximum size of queue 1061 * @msg: message to be added to queue 1062 * 1063 * Returns 1 if queue is currently overloaded, 0 otherwise 1064 */ 1065 1066static int queue_overloaded(u32 queue_size, u32 base, struct tipc_msg *msg) 1067{ 1068 u32 threshold; 1069 u32 imp = msg_importance(msg); 1070 1071 if (imp == TIPC_LOW_IMPORTANCE) 1072 threshold = base; 1073 else if (imp == TIPC_MEDIUM_IMPORTANCE) 1074 threshold = base * 2; 1075 else if (imp == TIPC_HIGH_IMPORTANCE) 1076 threshold = base * 100; 1077 else 1078 return 0; 1079 1080 if (msg_connected(msg)) 1081 threshold *= 4; 1082 1083 return (queue_size > threshold); 1084} 1085 1086/** 1087 * async_disconnect - wrapper function used to disconnect port 1088 * @portref: TIPC port reference (passed as pointer-sized value) 1089 */ 1090 1091static void async_disconnect(unsigned long portref) 1092{ 1093 tipc_disconnect((u32)portref); 1094} 1095 1096/** 1097 * dispatch - handle arriving message 1098 * @tport: TIPC port that received message 1099 * @buf: message 1100 * 1101 * Called with port locked. Must not take socket lock to avoid deadlock risk. 1102 * 1103 * Returns TIPC error status code (TIPC_OK if message is not to be rejected) 1104 */ 1105 1106static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) 1107{ 1108 struct tipc_msg *msg = buf_msg(buf); 1109 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle; 1110 struct socket *sock; 1111 u32 recv_q_len; 1112 1113 /* Reject message if socket is closing */ 1114 1115 if (!tsock) 1116 return TIPC_ERR_NO_PORT; 1117 1118 /* Reject message if it is wrong sort of message for socket */ 1119 1120 /* 1121 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD? 1122 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY 1123 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC 1124 */ 1125 sock = tsock->sk.sk_socket; 1126 if (sock->state == SS_READY) { 1127 if (msg_connected(msg)) { 1128 msg_dbg(msg, "dispatch filter 1\n"); 1129 return TIPC_ERR_NO_PORT; 1130 } 1131 } else { 1132 if (msg_mcast(msg)) { 1133 msg_dbg(msg, "dispatch filter 2\n"); 1134 return TIPC_ERR_NO_PORT; 1135 } 1136 if (sock->state == SS_CONNECTED) { 1137 if (!msg_connected(msg)) { 1138 msg_dbg(msg, "dispatch filter 3\n"); 1139 return TIPC_ERR_NO_PORT; 1140 } 1141 } 1142 else if (sock->state == SS_CONNECTING) { 1143 if (!msg_connected(msg) && (msg_errcode(msg) == 0)) { 1144 msg_dbg(msg, "dispatch filter 4\n"); 1145 return TIPC_ERR_NO_PORT; 1146 } 1147 } 1148 else if (sock->state == SS_LISTENING) { 1149 if (msg_connected(msg) || msg_errcode(msg)) { 1150 msg_dbg(msg, "dispatch filter 5\n"); 1151 return TIPC_ERR_NO_PORT; 1152 } 1153 } 1154 else if (sock->state == SS_DISCONNECTING) { 1155 msg_dbg(msg, "dispatch filter 6\n"); 1156 return TIPC_ERR_NO_PORT; 1157 } 1158 else /* (sock->state == SS_UNCONNECTED) */ { 1159 if (msg_connected(msg) || msg_errcode(msg)) { 1160 msg_dbg(msg, "dispatch filter 7\n"); 1161 return TIPC_ERR_NO_PORT; 1162 } 1163 } 1164 } 1165 1166 /* Reject message if there isn't room to queue it */ 1167 1168 if (unlikely((u32)atomic_read(&tipc_queue_size) > 1169 OVERLOAD_LIMIT_BASE)) { 1170 if (queue_overloaded(atomic_read(&tipc_queue_size), 1171 OVERLOAD_LIMIT_BASE, msg)) 1172 return TIPC_ERR_OVERLOAD; 1173 } 1174 recv_q_len = skb_queue_len(&tsock->sk.sk_receive_queue); 1175 if (unlikely(recv_q_len > (OVERLOAD_LIMIT_BASE / 2))) { 1176 if (queue_overloaded(recv_q_len, 1177 OVERLOAD_LIMIT_BASE / 2, msg)) 1178 return TIPC_ERR_OVERLOAD; 1179 } 1180 1181 /* Initiate connection termination for an incoming 'FIN' */ 1182 1183 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { 1184 sock->state = SS_DISCONNECTING; 1185 /* Note: Use signal since port lock is already taken! */ 1186 tipc_k_signal((Handler)async_disconnect, tport->ref); 1187 } 1188 1189 /* Enqueue message (finally!) */ 1190 1191 msg_dbg(msg,"<DISP<: "); 1192 TIPC_SKB_CB(buf)->handle = msg_data(msg); 1193 atomic_inc(&tipc_queue_size); 1194 skb_queue_tail(&sock->sk->sk_receive_queue, buf); 1195 1196 wake_up_interruptible(sock->sk->sk_sleep); 1197 return TIPC_OK; 1198} 1199 1200/** 1201 * wakeupdispatch - wake up port after congestion 1202 * @tport: port to wakeup 1203 * 1204 * Called with port lock on. 1205 */ 1206 1207static void wakeupdispatch(struct tipc_port *tport) 1208{ 1209 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle; 1210 1211 wake_up_interruptible(tsock->sk.sk_sleep); 1212} 1213 1214/** 1215 * connect - establish a connection to another TIPC port 1216 * @sock: socket structure 1217 * @dest: socket address for destination port 1218 * @destlen: size of socket address data structure 1219 * @flags: (unused) 1220 * 1221 * Returns 0 on success, errno otherwise 1222 */ 1223 1224static int connect(struct socket *sock, struct sockaddr *dest, int destlen, 1225 int flags) 1226{ 1227 struct tipc_sock *tsock = tipc_sk(sock->sk); 1228 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 1229 struct msghdr m = {NULL,}; 1230 struct sk_buff *buf; 1231 struct tipc_msg *msg; 1232 int res; 1233 1234 /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */ 1235 1236 if (sock->state == SS_READY) 1237 return -EOPNOTSUPP; 1238 1239 /* MOVE THE REST OF THIS ERROR CHECKING TO send_msg()? */ 1240 if (sock->state == SS_LISTENING) 1241 return -EOPNOTSUPP; 1242 if (sock->state == SS_CONNECTING) 1243 return -EALREADY; 1244 if (sock->state != SS_UNCONNECTED) 1245 return -EISCONN; 1246 1247 if ((dst->family != AF_TIPC) || 1248 ((dst->addrtype != TIPC_ADDR_NAME) && (dst->addrtype != TIPC_ADDR_ID))) 1249 return -EINVAL; 1250 1251 /* Send a 'SYN-' to destination */ 1252 1253 m.msg_name = dest; 1254 if ((res = send_msg(NULL, sock, &m, 0)) < 0) { 1255 sock->state = SS_DISCONNECTING; 1256 return res; 1257 } 1258 1259 if (down_interruptible(&tsock->sem)) 1260 return -ERESTARTSYS; 1261 1262 /* Wait for destination's 'ACK' response */ 1263 1264 res = wait_event_interruptible_timeout(*sock->sk->sk_sleep, 1265 skb_queue_len(&sock->sk->sk_receive_queue), 1266 sock->sk->sk_rcvtimeo); 1267 buf = skb_peek(&sock->sk->sk_receive_queue); 1268 if (res > 0) { 1269 msg = buf_msg(buf); 1270 res = auto_connect(sock, tsock, msg); 1271 if (!res) { 1272 if (dst->addrtype == TIPC_ADDR_NAME) { 1273 tsock->p->conn_type = dst->addr.name.name.type; 1274 tsock->p->conn_instance = dst->addr.name.name.instance; 1275 } 1276 if (!msg_data_sz(msg)) 1277 advance_queue(tsock); 1278 } 1279 } else { 1280 if (res == 0) { 1281 res = -ETIMEDOUT; 1282 } else 1283 { /* leave "res" unchanged */ } 1284 sock->state = SS_DISCONNECTING; 1285 } 1286 1287 up(&tsock->sem); 1288 return res; 1289} 1290 1291/** 1292 * listen - allow socket to listen for incoming connections 1293 * @sock: socket structure 1294 * @len: (unused) 1295 * 1296 * Returns 0 on success, errno otherwise 1297 */ 1298 1299static int listen(struct socket *sock, int len) 1300{ 1301 /* REQUIRES SOCKET LOCKING OF SOME SORT? */ 1302 1303 if (sock->state == SS_READY) 1304 return -EOPNOTSUPP; 1305 if (sock->state != SS_UNCONNECTED) 1306 return -EINVAL; 1307 sock->state = SS_LISTENING; 1308 return 0; 1309} 1310 1311/** 1312 * accept - wait for connection request 1313 * @sock: listening socket 1314 * @newsock: new socket that is to be connected 1315 * @flags: file-related flags associated with socket 1316 * 1317 * Returns 0 on success, errno otherwise 1318 */ 1319 1320static int accept(struct socket *sock, struct socket *newsock, int flags) 1321{ 1322 struct tipc_sock *tsock = tipc_sk(sock->sk); 1323 struct sk_buff *buf; 1324 int res = -EFAULT; 1325 1326 if (sock->state == SS_READY) 1327 return -EOPNOTSUPP; 1328 if (sock->state != SS_LISTENING) 1329 return -EINVAL; 1330 1331 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && 1332 (flags & O_NONBLOCK))) 1333 return -EWOULDBLOCK; 1334 1335 if (down_interruptible(&tsock->sem)) 1336 return -ERESTARTSYS; 1337 1338 if (wait_event_interruptible(*sock->sk->sk_sleep, 1339 skb_queue_len(&sock->sk->sk_receive_queue))) { 1340 res = -ERESTARTSYS; 1341 goto exit; 1342 } 1343 buf = skb_peek(&sock->sk->sk_receive_queue); 1344 1345 res = tipc_create(newsock, 0); 1346 if (!res) { 1347 struct tipc_sock *new_tsock = tipc_sk(newsock->sk); 1348 struct tipc_portid id; 1349 struct tipc_msg *msg = buf_msg(buf); 1350 u32 new_ref = new_tsock->p->ref; 1351 1352 id.ref = msg_origport(msg); 1353 id.node = msg_orignode(msg); 1354 tipc_connect2port(new_ref, &id); 1355 newsock->state = SS_CONNECTED; 1356 1357 tipc_set_portimportance(new_ref, msg_importance(msg)); 1358 if (msg_named(msg)) { 1359 new_tsock->p->conn_type = msg_nametype(msg); 1360 new_tsock->p->conn_instance = msg_nameinst(msg); 1361 } 1362 1363 /* 1364 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 1365 * Respond to 'SYN+' by queuing it on new socket. 1366 */ 1367 1368 msg_dbg(msg,"<ACC<: "); 1369 if (!msg_data_sz(msg)) { 1370 struct msghdr m = {NULL,}; 1371 1372 send_packet(NULL, newsock, &m, 0); 1373 advance_queue(tsock); 1374 } else { 1375 sock_lock(tsock); 1376 skb_dequeue(&sock->sk->sk_receive_queue); 1377 sock_unlock(tsock); 1378 skb_queue_head(&newsock->sk->sk_receive_queue, buf); 1379 } 1380 } 1381exit: 1382 up(&tsock->sem); 1383 return res; 1384} 1385 1386/** 1387 * shutdown - shutdown socket connection 1388 * @sock: socket structure 1389 * @how: direction to close (always treated as read + write) 1390 * 1391 * Terminates connection (if necessary), then purges socket's receive queue. 1392 * 1393 * Returns 0 on success, errno otherwise 1394 */ 1395 1396static int shutdown(struct socket *sock, int how) 1397{ 1398 struct tipc_sock* tsock = tipc_sk(sock->sk); 1399 struct sk_buff *buf; 1400 int res; 1401 1402 /* Could return -EINVAL for an invalid "how", but why bother? */ 1403 1404 if (down_interruptible(&tsock->sem)) 1405 return -ERESTARTSYS; 1406 1407 sock_lock(tsock); 1408 1409 switch (sock->state) { 1410 case SS_CONNECTED: 1411 1412 /* Send 'FIN+' or 'FIN-' message to peer */ 1413 1414 sock_unlock(tsock); 1415restart: 1416 if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { 1417 atomic_dec(&tipc_queue_size); 1418 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) { 1419 buf_discard(buf); 1420 goto restart; 1421 } 1422 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); 1423 } 1424 else { 1425 tipc_shutdown(tsock->p->ref); 1426 } 1427 sock_lock(tsock); 1428 1429 /* fall through */ 1430 1431 case SS_DISCONNECTING: 1432 1433 /* Discard any unreceived messages */ 1434 1435 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { 1436 atomic_dec(&tipc_queue_size); 1437 buf_discard(buf); 1438 } 1439 tsock->p->conn_unacked = 0; 1440 1441 /* fall through */ 1442 1443 case SS_CONNECTING: 1444 sock->state = SS_DISCONNECTING; 1445 res = 0; 1446 break; 1447 1448 default: 1449 res = -ENOTCONN; 1450 } 1451 1452 sock_unlock(tsock); 1453 1454 up(&tsock->sem); 1455 return res; 1456} 1457 1458/** 1459 * setsockopt - set socket option 1460 * @sock: socket structure 1461 * @lvl: option level 1462 * @opt: option identifier 1463 * @ov: pointer to new option value 1464 * @ol: length of option value 1465 * 1466 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 1467 * (to ease compatibility). 1468 * 1469 * Returns 0 on success, errno otherwise 1470 */ 1471 1472static int setsockopt(struct socket *sock, int lvl, int opt, char *ov, int ol) 1473{ 1474 struct tipc_sock *tsock = tipc_sk(sock->sk); 1475 u32 value; 1476 int res; 1477 1478 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 1479 return 0; 1480 if (lvl != SOL_TIPC) 1481 return -ENOPROTOOPT; 1482 if (ol < sizeof(value)) 1483 return -EINVAL; 1484 if ((res = get_user(value, (u32 *)ov))) 1485 return res; 1486 1487 if (down_interruptible(&tsock->sem)) 1488 return -ERESTARTSYS; 1489 1490 switch (opt) { 1491 case TIPC_IMPORTANCE: 1492 res = tipc_set_portimportance(tsock->p->ref, value); 1493 break; 1494 case TIPC_SRC_DROPPABLE: 1495 if (sock->type != SOCK_STREAM) 1496 res = tipc_set_portunreliable(tsock->p->ref, value); 1497 else 1498 res = -ENOPROTOOPT; 1499 break; 1500 case TIPC_DEST_DROPPABLE: 1501 res = tipc_set_portunreturnable(tsock->p->ref, value); 1502 break; 1503 case TIPC_CONN_TIMEOUT: 1504 sock->sk->sk_rcvtimeo = (value * HZ / 1000); 1505 break; 1506 default: 1507 res = -EINVAL; 1508 } 1509 1510 up(&tsock->sem); 1511 return res; 1512} 1513 1514/** 1515 * getsockopt - get socket option 1516 * @sock: socket structure 1517 * @lvl: option level 1518 * @opt: option identifier 1519 * @ov: receptacle for option value 1520 * @ol: receptacle for length of option value 1521 * 1522 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 1523 * (to ease compatibility). 1524 * 1525 * Returns 0 on success, errno otherwise 1526 */ 1527 1528static int getsockopt(struct socket *sock, int lvl, int opt, char *ov, int *ol) 1529{ 1530 struct tipc_sock *tsock = tipc_sk(sock->sk); 1531 int len; 1532 u32 value; 1533 int res; 1534 1535 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 1536 return put_user(0, ol); 1537 if (lvl != SOL_TIPC) 1538 return -ENOPROTOOPT; 1539 if ((res = get_user(len, ol))) 1540 return res; 1541 1542 if (down_interruptible(&tsock->sem)) 1543 return -ERESTARTSYS; 1544 1545 switch (opt) { 1546 case TIPC_IMPORTANCE: 1547 res = tipc_portimportance(tsock->p->ref, &value); 1548 break; 1549 case TIPC_SRC_DROPPABLE: 1550 res = tipc_portunreliable(tsock->p->ref, &value); 1551 break; 1552 case TIPC_DEST_DROPPABLE: 1553 res = tipc_portunreturnable(tsock->p->ref, &value); 1554 break; 1555 case TIPC_CONN_TIMEOUT: 1556 value = (sock->sk->sk_rcvtimeo * 1000) / HZ; 1557 break; 1558 default: 1559 res = -EINVAL; 1560 } 1561 1562 if (res) { 1563 /* "get" failed */ 1564 } 1565 else if (len < sizeof(value)) { 1566 res = -EINVAL; 1567 } 1568 else if ((res = copy_to_user(ov, &value, sizeof(value)))) { 1569 /* couldn't return value */ 1570 } 1571 else { 1572 res = put_user(sizeof(value), ol); 1573 } 1574 1575 up(&tsock->sem); 1576 return res; 1577} 1578 1579/** 1580 * Placeholders for non-implemented functionality 1581 * 1582 * Returns error code (POSIX-compliant where defined) 1583 */ 1584 1585static int ioctl(struct socket *s, u32 cmd, unsigned long arg) 1586{ 1587 return -EINVAL; 1588} 1589 1590static int no_mmap(struct file *file, struct socket *sock, 1591 struct vm_area_struct *vma) 1592{ 1593 return -EINVAL; 1594} 1595static ssize_t no_sendpage(struct socket *sock, struct page *page, 1596 int offset, size_t size, int flags) 1597{ 1598 return -EINVAL; 1599} 1600 1601static int no_skpair(struct socket *s1, struct socket *s2) 1602{ 1603 return -EOPNOTSUPP; 1604} 1605 1606/** 1607 * Protocol switches for the various types of TIPC sockets 1608 */ 1609 1610static struct proto_ops msg_ops = { 1611 .owner = THIS_MODULE, 1612 .family = AF_TIPC, 1613 .release = release, 1614 .bind = bind, 1615 .connect = connect, 1616 .socketpair = no_skpair, 1617 .accept = accept, 1618 .getname = get_name, 1619 .poll = poll, 1620 .ioctl = ioctl, 1621 .listen = listen, 1622 .shutdown = shutdown, 1623 .setsockopt = setsockopt, 1624 .getsockopt = getsockopt, 1625 .sendmsg = send_msg, 1626 .recvmsg = recv_msg, 1627 .mmap = no_mmap, 1628 .sendpage = no_sendpage 1629}; 1630 1631static struct proto_ops packet_ops = { 1632 .owner = THIS_MODULE, 1633 .family = AF_TIPC, 1634 .release = release, 1635 .bind = bind, 1636 .connect = connect, 1637 .socketpair = no_skpair, 1638 .accept = accept, 1639 .getname = get_name, 1640 .poll = poll, 1641 .ioctl = ioctl, 1642 .listen = listen, 1643 .shutdown = shutdown, 1644 .setsockopt = setsockopt, 1645 .getsockopt = getsockopt, 1646 .sendmsg = send_packet, 1647 .recvmsg = recv_msg, 1648 .mmap = no_mmap, 1649 .sendpage = no_sendpage 1650}; 1651 1652static struct proto_ops stream_ops = { 1653 .owner = THIS_MODULE, 1654 .family = AF_TIPC, 1655 .release = release, 1656 .bind = bind, 1657 .connect = connect, 1658 .socketpair = no_skpair, 1659 .accept = accept, 1660 .getname = get_name, 1661 .poll = poll, 1662 .ioctl = ioctl, 1663 .listen = listen, 1664 .shutdown = shutdown, 1665 .setsockopt = setsockopt, 1666 .getsockopt = getsockopt, 1667 .sendmsg = send_stream, 1668 .recvmsg = recv_stream, 1669 .mmap = no_mmap, 1670 .sendpage = no_sendpage 1671}; 1672 1673static struct net_proto_family tipc_family_ops = { 1674 .owner = THIS_MODULE, 1675 .family = AF_TIPC, 1676 .create = tipc_create 1677}; 1678 1679static struct proto tipc_proto = { 1680 .name = "TIPC", 1681 .owner = THIS_MODULE, 1682 .obj_size = sizeof(struct tipc_sock) 1683}; 1684 1685/** 1686 * tipc_socket_init - initialize TIPC socket interface 1687 * 1688 * Returns 0 on success, errno otherwise 1689 */ 1690int tipc_socket_init(void) 1691{ 1692 int res; 1693 1694 res = proto_register(&tipc_proto, 1); 1695 if (res) { 1696 err("Failed to register TIPC protocol type\n"); 1697 goto out; 1698 } 1699 1700 res = sock_register(&tipc_family_ops); 1701 if (res) { 1702 err("Failed to register TIPC socket type\n"); 1703 proto_unregister(&tipc_proto); 1704 goto out; 1705 } 1706 1707 sockets_enabled = 1; 1708 out: 1709 return res; 1710} 1711 1712/** 1713 * tipc_socket_stop - stop TIPC socket interface 1714 */ 1715void tipc_socket_stop(void) 1716{ 1717 if (!sockets_enabled) 1718 return; 1719 1720 sockets_enabled = 0; 1721 sock_unregister(tipc_family_ops.family); 1722 proto_unregister(&tipc_proto); 1723} 1724 1725