1 /* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2007, Ericsson AB 5 * Copyright (c) 2004-2007, 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 63 struct 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 71 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); 72 static void wakeupdispatch(struct tipc_port *tport); 73 74 static struct proto_ops packet_ops; 75 static struct proto_ops stream_ops; 76 static struct proto_ops msg_ops; 77 78 static struct proto tipc_proto; 79 80 static int sockets_enabled = 0; 81 82 static 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 */ 91 static 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 */ 99 static 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 */ 121 122 static 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 */ 146 147 static 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 */ 165 static 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 (unlikely(protocol != 0)) 173 return -EPROTONOSUPPORT; 174 175 ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE); 176 if (unlikely(!ref)) 177 return -ENOMEM; 178 179 sock->state = SS_UNCONNECTED; 180 181 switch (sock->type) { 182 case SOCK_STREAM: 183 sock->ops = &stream_ops; 184 break; 185 case SOCK_SEQPACKET: 186 sock->ops = &packet_ops; 187 break; 188 case SOCK_DGRAM: 189 tipc_set_portunreliable(ref, 1); 190 /* fall through */ 191 case SOCK_RDM: 192 tipc_set_portunreturnable(ref, 1); 193 sock->ops = &msg_ops; 194 sock->state = SS_READY; 195 break; 196 default: 197 tipc_deleteport(ref); 198 return -EPROTOTYPE; 199 } 200 201 sk = sk_alloc(AF_TIPC, GFP_KERNEL, &tipc_proto, 1); 202 if (!sk) { 203 tipc_deleteport(ref); 204 return -ENOMEM; 205 } 206 207 sock_init_data(sock, sk); 208 init_waitqueue_head(sk->sk_sleep); 209 sk->sk_rcvtimeo = 8 * HZ; /* default connect timeout = 8s */ 210 211 tsock = tipc_sk(sk); 212 port = tipc_get_port(ref); 213 214 tsock->p = port; 215 port->usr_handle = tsock; 216 217 init_MUTEX(&tsock->sem); 218 219 dbg("sock_create: %x\n",tsock); 220 221 atomic_inc(&tipc_user_count); 222 223 return 0; 224 } 225 226 /** 227 * release - destroy a TIPC socket 228 * @sock: socket to destroy 229 * 230 * This routine cleans up any messages that are still queued on the socket. 231 * For DGRAM and RDM socket types, all queued messages are rejected. 232 * For SEQPACKET and STREAM socket types, the first message is rejected 233 * and any others are discarded. (If the first message on a STREAM socket 234 * is partially-read, it is discarded and the next one is rejected instead.) 235 * 236 * NOTE: Rejected messages are not necessarily returned to the sender! They 237 * are returned or discarded according to the "destination droppable" setting 238 * specified for the message by the sender. 239 * 240 * Returns 0 on success, errno otherwise 241 */ 242 243 static int release(struct socket *sock) 244 { 245 struct tipc_sock *tsock = tipc_sk(sock->sk); 246 struct sock *sk = sock->sk; 247 int res = TIPC_OK; 248 struct sk_buff *buf; 249 250 dbg("sock_delete: %x\n",tsock); 251 if (!tsock) 252 return 0; 253 down_interruptible(&tsock->sem); 254 if (!sock->sk) { 255 up(&tsock->sem); 256 return 0; 257 } 258 259 /* Reject unreceived messages, unless no longer connected */ 260 261 while (sock->state != SS_DISCONNECTING) { 262 sock_lock(tsock); 263 buf = skb_dequeue(&sk->sk_receive_queue); 264 if (!buf) 265 tsock->p->usr_handle = NULL; 266 sock_unlock(tsock); 267 if (!buf) 268 break; 269 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) 270 buf_discard(buf); 271 else 272 tipc_reject_msg(buf, TIPC_ERR_NO_PORT); 273 atomic_dec(&tipc_queue_size); 274 } 275 276 /* Delete TIPC port */ 277 278 res = tipc_deleteport(tsock->p->ref); 279 sock->sk = NULL; 280 281 /* Discard any remaining messages */ 282 283 while ((buf = skb_dequeue(&sk->sk_receive_queue))) { 284 buf_discard(buf); 285 atomic_dec(&tipc_queue_size); 286 } 287 288 up(&tsock->sem); 289 290 sock_put(sk); 291 292 atomic_dec(&tipc_user_count); 293 return res; 294 } 295 296 /** 297 * bind - associate or disassocate TIPC name(s) with a socket 298 * @sock: socket structure 299 * @uaddr: socket address describing name(s) and desired operation 300 * @uaddr_len: size of socket address data structure 301 * 302 * Name and name sequence binding is indicated using a positive scope value; 303 * a negative scope value unbinds the specified name. Specifying no name 304 * (i.e. a socket address length of 0) unbinds all names from the socket. 305 * 306 * Returns 0 on success, errno otherwise 307 */ 308 309 static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) 310 { 311 struct tipc_sock *tsock = tipc_sk(sock->sk); 312 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 313 int res; 314 315 if (down_interruptible(&tsock->sem)) 316 return -ERESTARTSYS; 317 318 if (unlikely(!uaddr_len)) { 319 res = tipc_withdraw(tsock->p->ref, 0, NULL); 320 goto exit; 321 } 322 323 if (uaddr_len < sizeof(struct sockaddr_tipc)) { 324 res = -EINVAL; 325 goto exit; 326 } 327 328 if (addr->family != AF_TIPC) { 329 res = -EAFNOSUPPORT; 330 goto exit; 331 } 332 if (addr->addrtype == TIPC_ADDR_NAME) 333 addr->addr.nameseq.upper = addr->addr.nameseq.lower; 334 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { 335 res = -EAFNOSUPPORT; 336 goto exit; 337 } 338 339 if (addr->scope > 0) 340 res = tipc_publish(tsock->p->ref, addr->scope, 341 &addr->addr.nameseq); 342 else 343 res = tipc_withdraw(tsock->p->ref, -addr->scope, 344 &addr->addr.nameseq); 345 exit: 346 up(&tsock->sem); 347 return res; 348 } 349 350 /** 351 * get_name - get port ID of socket or peer socket 352 * @sock: socket structure 353 * @uaddr: area for returned socket address 354 * @uaddr_len: area for returned length of socket address 355 * @peer: 0 to obtain socket name, 1 to obtain peer socket name 356 * 357 * Returns 0 on success, errno otherwise 358 */ 359 360 static int get_name(struct socket *sock, struct sockaddr *uaddr, 361 int *uaddr_len, int peer) 362 { 363 struct tipc_sock *tsock = tipc_sk(sock->sk); 364 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 365 u32 res; 366 367 if (down_interruptible(&tsock->sem)) 368 return -ERESTARTSYS; 369 370 *uaddr_len = sizeof(*addr); 371 addr->addrtype = TIPC_ADDR_ID; 372 addr->family = AF_TIPC; 373 addr->scope = 0; 374 if (peer) 375 res = tipc_peer(tsock->p->ref, &addr->addr.id); 376 else 377 res = tipc_ownidentity(tsock->p->ref, &addr->addr.id); 378 addr->addr.name.domain = 0; 379 380 up(&tsock->sem); 381 return res; 382 } 383 384 /** 385 * poll - read and possibly block on pollmask 386 * @file: file structure associated with the socket 387 * @sock: socket for which to calculate the poll bits 388 * @wait: ??? 389 * 390 * Returns the pollmask 391 */ 392 393 static unsigned int poll(struct file *file, struct socket *sock, 394 poll_table *wait) 395 { 396 poll_wait(file, sock->sk->sk_sleep, wait); 397 /* NEED LOCK HERE? */ 398 return pollmask(sock); 399 } 400 401 /** 402 * dest_name_check - verify user is permitted to send to specified port name 403 * @dest: destination address 404 * @m: descriptor for message to be sent 405 * 406 * Prevents restricted configuration commands from being issued by 407 * unauthorized users. 408 * 409 * Returns 0 if permission is granted, otherwise errno 410 */ 411 412 static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) 413 { 414 struct tipc_cfg_msg_hdr hdr; 415 416 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) 417 return 0; 418 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) 419 return 0; 420 421 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) 422 return -EACCES; 423 424 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) 425 return -EFAULT; 426 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) 427 return -EACCES; 428 429 return 0; 430 } 431 432 /** 433 * send_msg - send message in connectionless manner 434 * @iocb: (unused) 435 * @sock: socket structure 436 * @m: message to send 437 * @total_len: length of message 438 * 439 * Message must have an destination specified explicitly. 440 * Used for SOCK_RDM and SOCK_DGRAM messages, 441 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 442 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 443 * 444 * Returns the number of bytes sent on success, or errno otherwise 445 */ 446 447 static int send_msg(struct kiocb *iocb, struct socket *sock, 448 struct msghdr *m, size_t total_len) 449 { 450 struct tipc_sock *tsock = tipc_sk(sock->sk); 451 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; 452 struct sk_buff *buf; 453 int needs_conn; 454 int res = -EINVAL; 455 456 if (unlikely(!dest)) 457 return -EDESTADDRREQ; 458 if (unlikely((m->msg_namelen < sizeof(*dest)) || 459 (dest->family != AF_TIPC))) 460 return -EINVAL; 461 462 needs_conn = (sock->state != SS_READY); 463 if (unlikely(needs_conn)) { 464 if (sock->state == SS_LISTENING) 465 return -EPIPE; 466 if (sock->state != SS_UNCONNECTED) 467 return -EISCONN; 468 if ((tsock->p->published) || 469 ((sock->type == SOCK_STREAM) && (total_len != 0))) 470 return -EOPNOTSUPP; 471 if (dest->addrtype == TIPC_ADDR_NAME) { 472 tsock->p->conn_type = dest->addr.name.name.type; 473 tsock->p->conn_instance = dest->addr.name.name.instance; 474 } 475 } 476 477 if (down_interruptible(&tsock->sem)) 478 return -ERESTARTSYS; 479 480 if (needs_conn) { 481 482 /* Abort any pending connection attempts (very unlikely) */ 483 484 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { 485 tipc_reject_msg(buf, TIPC_ERR_NO_PORT); 486 atomic_dec(&tipc_queue_size); 487 } 488 489 sock->state = SS_CONNECTING; 490 } 491 492 do { 493 if (dest->addrtype == TIPC_ADDR_NAME) { 494 if ((res = dest_name_check(dest, m))) 495 goto exit; 496 res = tipc_send2name(tsock->p->ref, 497 &dest->addr.name.name, 498 dest->addr.name.domain, 499 m->msg_iovlen, 500 m->msg_iov); 501 } 502 else if (dest->addrtype == TIPC_ADDR_ID) { 503 res = tipc_send2port(tsock->p->ref, 504 &dest->addr.id, 505 m->msg_iovlen, 506 m->msg_iov); 507 } 508 else if (dest->addrtype == TIPC_ADDR_MCAST) { 509 if (needs_conn) { 510 res = -EOPNOTSUPP; 511 goto exit; 512 } 513 if ((res = dest_name_check(dest, m))) 514 goto exit; 515 res = tipc_multicast(tsock->p->ref, 516 &dest->addr.nameseq, 517 0, 518 m->msg_iovlen, 519 m->msg_iov); 520 } 521 if (likely(res != -ELINKCONG)) { 522 exit: 523 up(&tsock->sem); 524 return res; 525 } 526 if (m->msg_flags & MSG_DONTWAIT) { 527 res = -EWOULDBLOCK; 528 goto exit; 529 } 530 if (wait_event_interruptible(*sock->sk->sk_sleep, 531 !tsock->p->congested)) { 532 res = -ERESTARTSYS; 533 goto exit; 534 } 535 } while (1); 536 } 537 538 /** 539 * send_packet - send a connection-oriented message 540 * @iocb: (unused) 541 * @sock: socket structure 542 * @m: message to send 543 * @total_len: length of message 544 * 545 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. 546 * 547 * Returns the number of bytes sent on success, or errno otherwise 548 */ 549 550 static int send_packet(struct kiocb *iocb, struct socket *sock, 551 struct msghdr *m, size_t total_len) 552 { 553 struct tipc_sock *tsock = tipc_sk(sock->sk); 554 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; 555 int res; 556 557 /* Handle implied connection establishment */ 558 559 if (unlikely(dest)) 560 return send_msg(iocb, sock, m, total_len); 561 562 if (down_interruptible(&tsock->sem)) { 563 return -ERESTARTSYS; 564 } 565 566 do { 567 if (unlikely(sock->state != SS_CONNECTED)) { 568 if (sock->state == SS_DISCONNECTING) 569 res = -EPIPE; 570 else 571 res = -ENOTCONN; 572 goto exit; 573 } 574 575 res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov); 576 if (likely(res != -ELINKCONG)) { 577 exit: 578 up(&tsock->sem); 579 return res; 580 } 581 if (m->msg_flags & MSG_DONTWAIT) { 582 res = -EWOULDBLOCK; 583 goto exit; 584 } 585 if (wait_event_interruptible(*sock->sk->sk_sleep, 586 !tsock->p->congested)) { 587 res = -ERESTARTSYS; 588 goto exit; 589 } 590 } while (1); 591 } 592 593 /** 594 * send_stream - send stream-oriented data 595 * @iocb: (unused) 596 * @sock: socket structure 597 * @m: data to send 598 * @total_len: total length of data to be sent 599 * 600 * Used for SOCK_STREAM data. 601 * 602 * Returns the number of bytes sent on success (or partial success), 603 * or errno if no data sent 604 */ 605 606 607 static int send_stream(struct kiocb *iocb, struct socket *sock, 608 struct msghdr *m, size_t total_len) 609 { 610 struct tipc_port *tport; 611 struct msghdr my_msg; 612 struct iovec my_iov; 613 struct iovec *curr_iov; 614 int curr_iovlen; 615 char __user *curr_start; 616 u32 hdr_size; 617 int curr_left; 618 int bytes_to_send; 619 int bytes_sent; 620 int res; 621 622 /* Handle special cases where there is no connection */ 623 624 if (unlikely(sock->state != SS_CONNECTED)) { 625 if (sock->state == SS_UNCONNECTED) 626 return send_packet(iocb, sock, m, total_len); 627 else if (sock->state == SS_DISCONNECTING) 628 return -EPIPE; 629 else 630 return -ENOTCONN; 631 } 632 633 if (unlikely(m->msg_name)) 634 return -EISCONN; 635 636 /* 637 * Send each iovec entry using one or more messages 638 * 639 * Note: This algorithm is good for the most likely case 640 * (i.e. one large iovec entry), but could be improved to pass sets 641 * of small iovec entries into send_packet(). 642 */ 643 644 curr_iov = m->msg_iov; 645 curr_iovlen = m->msg_iovlen; 646 my_msg.msg_iov = &my_iov; 647 my_msg.msg_iovlen = 1; 648 my_msg.msg_flags = m->msg_flags; 649 my_msg.msg_name = NULL; 650 bytes_sent = 0; 651 652 tport = tipc_sk(sock->sk)->p; 653 hdr_size = msg_hdr_sz(&tport->phdr); 654 655 while (curr_iovlen--) { 656 curr_start = curr_iov->iov_base; 657 curr_left = curr_iov->iov_len; 658 659 while (curr_left) { 660 bytes_to_send = tport->max_pkt - hdr_size; 661 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) 662 bytes_to_send = TIPC_MAX_USER_MSG_SIZE; 663 if (curr_left < bytes_to_send) 664 bytes_to_send = curr_left; 665 my_iov.iov_base = curr_start; 666 my_iov.iov_len = bytes_to_send; 667 if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0) { 668 if (bytes_sent != 0) 669 res = bytes_sent; 670 return res; 671 } 672 curr_left -= bytes_to_send; 673 curr_start += bytes_to_send; 674 bytes_sent += bytes_to_send; 675 } 676 677 curr_iov++; 678 } 679 680 return bytes_sent; 681 } 682 683 /** 684 * auto_connect - complete connection setup to a remote port 685 * @sock: socket structure 686 * @tsock: TIPC-specific socket structure 687 * @msg: peer's response message 688 * 689 * Returns 0 on success, errno otherwise 690 */ 691 692 static int auto_connect(struct socket *sock, struct tipc_sock *tsock, 693 struct tipc_msg *msg) 694 { 695 struct tipc_portid peer; 696 697 if (msg_errcode(msg)) { 698 sock->state = SS_DISCONNECTING; 699 return -ECONNREFUSED; 700 } 701 702 peer.ref = msg_origport(msg); 703 peer.node = msg_orignode(msg); 704 tipc_connect2port(tsock->p->ref, &peer); 705 tipc_set_portimportance(tsock->p->ref, msg_importance(msg)); 706 sock->state = SS_CONNECTED; 707 return 0; 708 } 709 710 /** 711 * set_orig_addr - capture sender's address for received message 712 * @m: descriptor for message info 713 * @msg: received message header 714 * 715 * Note: Address is not captured if not requested by receiver. 716 */ 717 718 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) 719 { 720 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; 721 722 if (addr) { 723 addr->family = AF_TIPC; 724 addr->addrtype = TIPC_ADDR_ID; 725 addr->addr.id.ref = msg_origport(msg); 726 addr->addr.id.node = msg_orignode(msg); 727 addr->addr.name.domain = 0; /* could leave uninitialized */ 728 addr->scope = 0; /* could leave uninitialized */ 729 m->msg_namelen = sizeof(struct sockaddr_tipc); 730 } 731 } 732 733 /** 734 * anc_data_recv - optionally capture ancillary data for received message 735 * @m: descriptor for message info 736 * @msg: received message header 737 * @tport: TIPC port associated with message 738 * 739 * Note: Ancillary data is not captured if not requested by receiver. 740 * 741 * Returns 0 if successful, otherwise errno 742 */ 743 744 static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, 745 struct tipc_port *tport) 746 { 747 u32 anc_data[3]; 748 u32 err; 749 u32 dest_type; 750 int has_name; 751 int res; 752 753 if (likely(m->msg_controllen == 0)) 754 return 0; 755 756 /* Optionally capture errored message object(s) */ 757 758 err = msg ? msg_errcode(msg) : 0; 759 if (unlikely(err)) { 760 anc_data[0] = err; 761 anc_data[1] = msg_data_sz(msg); 762 if ((res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data))) 763 return res; 764 if (anc_data[1] && 765 (res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], 766 msg_data(msg)))) 767 return res; 768 } 769 770 /* Optionally capture message destination object */ 771 772 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 773 switch (dest_type) { 774 case TIPC_NAMED_MSG: 775 has_name = 1; 776 anc_data[0] = msg_nametype(msg); 777 anc_data[1] = msg_namelower(msg); 778 anc_data[2] = msg_namelower(msg); 779 break; 780 case TIPC_MCAST_MSG: 781 has_name = 1; 782 anc_data[0] = msg_nametype(msg); 783 anc_data[1] = msg_namelower(msg); 784 anc_data[2] = msg_nameupper(msg); 785 break; 786 case TIPC_CONN_MSG: 787 has_name = (tport->conn_type != 0); 788 anc_data[0] = tport->conn_type; 789 anc_data[1] = tport->conn_instance; 790 anc_data[2] = tport->conn_instance; 791 break; 792 default: 793 has_name = 0; 794 } 795 if (has_name && 796 (res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data))) 797 return res; 798 799 return 0; 800 } 801 802 /** 803 * recv_msg - receive packet-oriented message 804 * @iocb: (unused) 805 * @m: descriptor for message info 806 * @buf_len: total size of user buffer area 807 * @flags: receive flags 808 * 809 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 810 * If the complete message doesn't fit in user area, truncate it. 811 * 812 * Returns size of returned message data, errno otherwise 813 */ 814 815 static int recv_msg(struct kiocb *iocb, struct socket *sock, 816 struct msghdr *m, size_t buf_len, int flags) 817 { 818 struct tipc_sock *tsock = tipc_sk(sock->sk); 819 struct sk_buff *buf; 820 struct tipc_msg *msg; 821 unsigned int q_len; 822 unsigned int sz; 823 u32 err; 824 int res; 825 826 /* Currently doesn't support receiving into multiple iovec entries */ 827 828 if (m->msg_iovlen != 1) 829 return -EOPNOTSUPP; 830 831 /* Catch invalid receive attempts */ 832 833 if (unlikely(!buf_len)) 834 return -EINVAL; 835 836 if (sock->type == SOCK_SEQPACKET) { 837 if (unlikely(sock->state == SS_UNCONNECTED)) 838 return -ENOTCONN; 839 if (unlikely((sock->state == SS_DISCONNECTING) && 840 (skb_queue_len(&sock->sk->sk_receive_queue) == 0))) 841 return -ENOTCONN; 842 } 843 844 /* Look for a message in receive queue; wait if necessary */ 845 846 if (unlikely(down_interruptible(&tsock->sem))) 847 return -ERESTARTSYS; 848 849 restart: 850 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && 851 (flags & MSG_DONTWAIT))) { 852 res = -EWOULDBLOCK; 853 goto exit; 854 } 855 856 if ((res = wait_event_interruptible( 857 *sock->sk->sk_sleep, 858 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) || 859 (sock->state == SS_DISCONNECTING))) )) { 860 goto exit; 861 } 862 863 /* Catch attempt to receive on an already terminated connection */ 864 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */ 865 866 if (!q_len) { 867 res = -ENOTCONN; 868 goto exit; 869 } 870 871 /* Get access to first message in receive queue */ 872 873 buf = skb_peek(&sock->sk->sk_receive_queue); 874 msg = buf_msg(buf); 875 sz = msg_data_sz(msg); 876 err = msg_errcode(msg); 877 878 /* Complete connection setup for an implied connect */ 879 880 if (unlikely(sock->state == SS_CONNECTING)) { 881 if ((res = auto_connect(sock, tsock, msg))) 882 goto exit; 883 } 884 885 /* Discard an empty non-errored message & try again */ 886 887 if ((!sz) && (!err)) { 888 advance_queue(tsock); 889 goto restart; 890 } 891 892 /* Capture sender's address (optional) */ 893 894 set_orig_addr(m, msg); 895 896 /* Capture ancillary data (optional) */ 897 898 if ((res = anc_data_recv(m, msg, tsock->p))) 899 goto exit; 900 901 /* Capture message data (if valid) & compute return value (always) */ 902 903 if (!err) { 904 if (unlikely(buf_len < sz)) { 905 sz = buf_len; 906 m->msg_flags |= MSG_TRUNC; 907 } 908 if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg), 909 sz))) { 910 res = -EFAULT; 911 goto exit; 912 } 913 res = sz; 914 } else { 915 if ((sock->state == SS_READY) || 916 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) 917 res = 0; 918 else 919 res = -ECONNRESET; 920 } 921 922 /* Consume received message (optional) */ 923 924 if (likely(!(flags & MSG_PEEK))) { 925 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) 926 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked); 927 advance_queue(tsock); 928 } 929 exit: 930 up(&tsock->sem); 931 return res; 932 } 933 934 /** 935 * recv_stream - receive stream-oriented data 936 * @iocb: (unused) 937 * @m: descriptor for message info 938 * @buf_len: total size of user buffer area 939 * @flags: receive flags 940 * 941 * Used for SOCK_STREAM messages only. If not enough data is available 942 * will optionally wait for more; never truncates data. 943 * 944 * Returns size of returned message data, errno otherwise 945 */ 946 947 static int recv_stream(struct kiocb *iocb, struct socket *sock, 948 struct msghdr *m, size_t buf_len, int flags) 949 { 950 struct tipc_sock *tsock = tipc_sk(sock->sk); 951 struct sk_buff *buf; 952 struct tipc_msg *msg; 953 unsigned int q_len; 954 unsigned int sz; 955 int sz_to_copy; 956 int sz_copied = 0; 957 int needed; 958 char __user *crs = m->msg_iov->iov_base; 959 unsigned char *buf_crs; 960 u32 err; 961 int res; 962 963 /* Currently doesn't support receiving into multiple iovec entries */ 964 965 if (m->msg_iovlen != 1) 966 return -EOPNOTSUPP; 967 968 /* Catch invalid receive attempts */ 969 970 if (unlikely(!buf_len)) 971 return -EINVAL; 972 973 if (unlikely(sock->state == SS_DISCONNECTING)) { 974 if (skb_queue_len(&sock->sk->sk_receive_queue) == 0) 975 return -ENOTCONN; 976 } else if (unlikely(sock->state != SS_CONNECTED)) 977 return -ENOTCONN; 978 979 /* Look for a message in receive queue; wait if necessary */ 980 981 if (unlikely(down_interruptible(&tsock->sem))) 982 return -ERESTARTSYS; 983 984 restart: 985 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && 986 (flags & MSG_DONTWAIT))) { 987 res = -EWOULDBLOCK; 988 goto exit; 989 } 990 991 if ((res = wait_event_interruptible( 992 *sock->sk->sk_sleep, 993 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) || 994 (sock->state == SS_DISCONNECTING))) )) { 995 goto exit; 996 } 997 998 /* Catch attempt to receive on an already terminated connection */ 999 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */ 1000 1001 if (!q_len) { 1002 res = -ENOTCONN; 1003 goto exit; 1004 } 1005 1006 /* Get access to first message in receive queue */ 1007 1008 buf = skb_peek(&sock->sk->sk_receive_queue); 1009 msg = buf_msg(buf); 1010 sz = msg_data_sz(msg); 1011 err = msg_errcode(msg); 1012 1013 /* Discard an empty non-errored message & try again */ 1014 1015 if ((!sz) && (!err)) { 1016 advance_queue(tsock); 1017 goto restart; 1018 } 1019 1020 /* Optionally capture sender's address & ancillary data of first msg */ 1021 1022 if (sz_copied == 0) { 1023 set_orig_addr(m, msg); 1024 if ((res = anc_data_recv(m, msg, tsock->p))) 1025 goto exit; 1026 } 1027 1028 /* Capture message data (if valid) & compute return value (always) */ 1029 1030 if (!err) { 1031 buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle); 1032 sz = skb_tail_pointer(buf) - buf_crs; 1033 1034 needed = (buf_len - sz_copied); 1035 sz_to_copy = (sz <= needed) ? sz : needed; 1036 if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) { 1037 res = -EFAULT; 1038 goto exit; 1039 } 1040 sz_copied += sz_to_copy; 1041 1042 if (sz_to_copy < sz) { 1043 if (!(flags & MSG_PEEK)) 1044 TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy; 1045 goto exit; 1046 } 1047 1048 crs += sz_to_copy; 1049 } else { 1050 if (sz_copied != 0) 1051 goto exit; /* can't add error msg to valid data */ 1052 1053 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) 1054 res = 0; 1055 else 1056 res = -ECONNRESET; 1057 } 1058 1059 /* Consume received message (optional) */ 1060 1061 if (likely(!(flags & MSG_PEEK))) { 1062 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) 1063 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked); 1064 advance_queue(tsock); 1065 } 1066 1067 /* Loop around if more data is required */ 1068 1069 if ((sz_copied < buf_len) /* didn't get all requested data */ 1070 && (flags & MSG_WAITALL) /* ... and need to wait for more */ 1071 && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */ 1072 && (!err) /* ... and haven't reached a FIN */ 1073 ) 1074 goto restart; 1075 1076 exit: 1077 up(&tsock->sem); 1078 return sz_copied ? sz_copied : res; 1079 } 1080 1081 /** 1082 * queue_overloaded - test if queue overload condition exists 1083 * @queue_size: current size of queue 1084 * @base: nominal maximum size of queue 1085 * @msg: message to be added to queue 1086 * 1087 * Returns 1 if queue is currently overloaded, 0 otherwise 1088 */ 1089 1090 static int queue_overloaded(u32 queue_size, u32 base, struct tipc_msg *msg) 1091 { 1092 u32 threshold; 1093 u32 imp = msg_importance(msg); 1094 1095 if (imp == TIPC_LOW_IMPORTANCE) 1096 threshold = base; 1097 else if (imp == TIPC_MEDIUM_IMPORTANCE) 1098 threshold = base * 2; 1099 else if (imp == TIPC_HIGH_IMPORTANCE) 1100 threshold = base * 100; 1101 else 1102 return 0; 1103 1104 if (msg_connected(msg)) 1105 threshold *= 4; 1106 1107 return (queue_size > threshold); 1108 } 1109 1110 /** 1111 * async_disconnect - wrapper function used to disconnect port 1112 * @portref: TIPC port reference (passed as pointer-sized value) 1113 */ 1114 1115 static void async_disconnect(unsigned long portref) 1116 { 1117 tipc_disconnect((u32)portref); 1118 } 1119 1120 /** 1121 * dispatch - handle arriving message 1122 * @tport: TIPC port that received message 1123 * @buf: message 1124 * 1125 * Called with port locked. Must not take socket lock to avoid deadlock risk. 1126 * 1127 * Returns TIPC error status code (TIPC_OK if message is not to be rejected) 1128 */ 1129 1130 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) 1131 { 1132 struct tipc_msg *msg = buf_msg(buf); 1133 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle; 1134 struct socket *sock; 1135 u32 recv_q_len; 1136 1137 /* Reject message if socket is closing */ 1138 1139 if (!tsock) 1140 return TIPC_ERR_NO_PORT; 1141 1142 /* Reject message if it is wrong sort of message for socket */ 1143 1144 /* 1145 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD? 1146 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY 1147 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC 1148 */ 1149 sock = tsock->sk.sk_socket; 1150 if (sock->state == SS_READY) { 1151 if (msg_connected(msg)) { 1152 msg_dbg(msg, "dispatch filter 1\n"); 1153 return TIPC_ERR_NO_PORT; 1154 } 1155 } else { 1156 if (msg_mcast(msg)) { 1157 msg_dbg(msg, "dispatch filter 2\n"); 1158 return TIPC_ERR_NO_PORT; 1159 } 1160 if (sock->state == SS_CONNECTED) { 1161 if (!msg_connected(msg)) { 1162 msg_dbg(msg, "dispatch filter 3\n"); 1163 return TIPC_ERR_NO_PORT; 1164 } 1165 } 1166 else if (sock->state == SS_CONNECTING) { 1167 if (!msg_connected(msg) && (msg_errcode(msg) == 0)) { 1168 msg_dbg(msg, "dispatch filter 4\n"); 1169 return TIPC_ERR_NO_PORT; 1170 } 1171 } 1172 else if (sock->state == SS_LISTENING) { 1173 if (msg_connected(msg) || msg_errcode(msg)) { 1174 msg_dbg(msg, "dispatch filter 5\n"); 1175 return TIPC_ERR_NO_PORT; 1176 } 1177 } 1178 else if (sock->state == SS_DISCONNECTING) { 1179 msg_dbg(msg, "dispatch filter 6\n"); 1180 return TIPC_ERR_NO_PORT; 1181 } 1182 else /* (sock->state == SS_UNCONNECTED) */ { 1183 if (msg_connected(msg) || msg_errcode(msg)) { 1184 msg_dbg(msg, "dispatch filter 7\n"); 1185 return TIPC_ERR_NO_PORT; 1186 } 1187 } 1188 } 1189 1190 /* Reject message if there isn't room to queue it */ 1191 1192 if (unlikely((u32)atomic_read(&tipc_queue_size) > 1193 OVERLOAD_LIMIT_BASE)) { 1194 if (queue_overloaded(atomic_read(&tipc_queue_size), 1195 OVERLOAD_LIMIT_BASE, msg)) 1196 return TIPC_ERR_OVERLOAD; 1197 } 1198 recv_q_len = skb_queue_len(&tsock->sk.sk_receive_queue); 1199 if (unlikely(recv_q_len > (OVERLOAD_LIMIT_BASE / 2))) { 1200 if (queue_overloaded(recv_q_len, 1201 OVERLOAD_LIMIT_BASE / 2, msg)) 1202 return TIPC_ERR_OVERLOAD; 1203 } 1204 1205 /* Initiate connection termination for an incoming 'FIN' */ 1206 1207 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { 1208 sock->state = SS_DISCONNECTING; 1209 /* Note: Use signal since port lock is already taken! */ 1210 tipc_k_signal((Handler)async_disconnect, tport->ref); 1211 } 1212 1213 /* Enqueue message (finally!) */ 1214 1215 msg_dbg(msg,"<DISP<: "); 1216 TIPC_SKB_CB(buf)->handle = msg_data(msg); 1217 atomic_inc(&tipc_queue_size); 1218 skb_queue_tail(&sock->sk->sk_receive_queue, buf); 1219 1220 if (waitqueue_active(sock->sk->sk_sleep)) 1221 wake_up_interruptible(sock->sk->sk_sleep); 1222 return TIPC_OK; 1223 } 1224 1225 /** 1226 * wakeupdispatch - wake up port after congestion 1227 * @tport: port to wakeup 1228 * 1229 * Called with port lock on. 1230 */ 1231 1232 static void wakeupdispatch(struct tipc_port *tport) 1233 { 1234 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle; 1235 1236 if (waitqueue_active(tsock->sk.sk_sleep)) 1237 wake_up_interruptible(tsock->sk.sk_sleep); 1238 } 1239 1240 /** 1241 * connect - establish a connection to another TIPC port 1242 * @sock: socket structure 1243 * @dest: socket address for destination port 1244 * @destlen: size of socket address data structure 1245 * @flags: (unused) 1246 * 1247 * Returns 0 on success, errno otherwise 1248 */ 1249 1250 static int connect(struct socket *sock, struct sockaddr *dest, int destlen, 1251 int flags) 1252 { 1253 struct tipc_sock *tsock = tipc_sk(sock->sk); 1254 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 1255 struct msghdr m = {NULL,}; 1256 struct sk_buff *buf; 1257 struct tipc_msg *msg; 1258 int res; 1259 1260 /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */ 1261 1262 if (sock->state == SS_READY) 1263 return -EOPNOTSUPP; 1264 1265 /* Issue Posix-compliant error code if socket is in the wrong state */ 1266 1267 if (sock->state == SS_LISTENING) 1268 return -EOPNOTSUPP; 1269 if (sock->state == SS_CONNECTING) 1270 return -EALREADY; 1271 if (sock->state != SS_UNCONNECTED) 1272 return -EISCONN; 1273 1274 /* 1275 * Reject connection attempt using multicast address 1276 * 1277 * Note: send_msg() validates the rest of the address fields, 1278 * so there's no need to do it here 1279 */ 1280 1281 if (dst->addrtype == TIPC_ADDR_MCAST) 1282 return -EINVAL; 1283 1284 /* Send a 'SYN-' to destination */ 1285 1286 m.msg_name = dest; 1287 m.msg_namelen = destlen; 1288 if ((res = send_msg(NULL, sock, &m, 0)) < 0) { 1289 sock->state = SS_DISCONNECTING; 1290 return res; 1291 } 1292 1293 if (down_interruptible(&tsock->sem)) 1294 return -ERESTARTSYS; 1295 1296 /* Wait for destination's 'ACK' response */ 1297 1298 res = wait_event_interruptible_timeout(*sock->sk->sk_sleep, 1299 skb_queue_len(&sock->sk->sk_receive_queue), 1300 sock->sk->sk_rcvtimeo); 1301 buf = skb_peek(&sock->sk->sk_receive_queue); 1302 if (res > 0) { 1303 msg = buf_msg(buf); 1304 res = auto_connect(sock, tsock, msg); 1305 if (!res) { 1306 if (!msg_data_sz(msg)) 1307 advance_queue(tsock); 1308 } 1309 } else { 1310 if (res == 0) { 1311 res = -ETIMEDOUT; 1312 } else 1313 { /* leave "res" unchanged */ } 1314 sock->state = SS_DISCONNECTING; 1315 } 1316 1317 up(&tsock->sem); 1318 return res; 1319 } 1320 1321 /** 1322 * listen - allow socket to listen for incoming connections 1323 * @sock: socket structure 1324 * @len: (unused) 1325 * 1326 * Returns 0 on success, errno otherwise 1327 */ 1328 1329 static int listen(struct socket *sock, int len) 1330 { 1331 /* REQUIRES SOCKET LOCKING OF SOME SORT? */ 1332 1333 if (sock->state == SS_READY) 1334 return -EOPNOTSUPP; 1335 if (sock->state != SS_UNCONNECTED) 1336 return -EINVAL; 1337 sock->state = SS_LISTENING; 1338 return 0; 1339 } 1340 1341 /** 1342 * accept - wait for connection request 1343 * @sock: listening socket 1344 * @newsock: new socket that is to be connected 1345 * @flags: file-related flags associated with socket 1346 * 1347 * Returns 0 on success, errno otherwise 1348 */ 1349 1350 static int accept(struct socket *sock, struct socket *newsock, int flags) 1351 { 1352 struct tipc_sock *tsock = tipc_sk(sock->sk); 1353 struct sk_buff *buf; 1354 int res = -EFAULT; 1355 1356 if (sock->state == SS_READY) 1357 return -EOPNOTSUPP; 1358 if (sock->state != SS_LISTENING) 1359 return -EINVAL; 1360 1361 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && 1362 (flags & O_NONBLOCK))) 1363 return -EWOULDBLOCK; 1364 1365 if (down_interruptible(&tsock->sem)) 1366 return -ERESTARTSYS; 1367 1368 if (wait_event_interruptible(*sock->sk->sk_sleep, 1369 skb_queue_len(&sock->sk->sk_receive_queue))) { 1370 res = -ERESTARTSYS; 1371 goto exit; 1372 } 1373 buf = skb_peek(&sock->sk->sk_receive_queue); 1374 1375 res = tipc_create(newsock, 0); 1376 if (!res) { 1377 struct tipc_sock *new_tsock = tipc_sk(newsock->sk); 1378 struct tipc_portid id; 1379 struct tipc_msg *msg = buf_msg(buf); 1380 u32 new_ref = new_tsock->p->ref; 1381 1382 id.ref = msg_origport(msg); 1383 id.node = msg_orignode(msg); 1384 tipc_connect2port(new_ref, &id); 1385 newsock->state = SS_CONNECTED; 1386 1387 tipc_set_portimportance(new_ref, msg_importance(msg)); 1388 if (msg_named(msg)) { 1389 new_tsock->p->conn_type = msg_nametype(msg); 1390 new_tsock->p->conn_instance = msg_nameinst(msg); 1391 } 1392 1393 /* 1394 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 1395 * Respond to 'SYN+' by queuing it on new socket. 1396 */ 1397 1398 msg_dbg(msg,"<ACC<: "); 1399 if (!msg_data_sz(msg)) { 1400 struct msghdr m = {NULL,}; 1401 1402 send_packet(NULL, newsock, &m, 0); 1403 advance_queue(tsock); 1404 } else { 1405 sock_lock(tsock); 1406 skb_dequeue(&sock->sk->sk_receive_queue); 1407 sock_unlock(tsock); 1408 skb_queue_head(&newsock->sk->sk_receive_queue, buf); 1409 } 1410 } 1411 exit: 1412 up(&tsock->sem); 1413 return res; 1414 } 1415 1416 /** 1417 * shutdown - shutdown socket connection 1418 * @sock: socket structure 1419 * @how: direction to close (unused; always treated as read + write) 1420 * 1421 * Terminates connection (if necessary), then purges socket's receive queue. 1422 * 1423 * Returns 0 on success, errno otherwise 1424 */ 1425 1426 static int shutdown(struct socket *sock, int how) 1427 { 1428 struct tipc_sock* tsock = tipc_sk(sock->sk); 1429 struct sk_buff *buf; 1430 int res; 1431 1432 /* Could return -EINVAL for an invalid "how", but why bother? */ 1433 1434 if (down_interruptible(&tsock->sem)) 1435 return -ERESTARTSYS; 1436 1437 sock_lock(tsock); 1438 1439 switch (sock->state) { 1440 case SS_CONNECTED: 1441 1442 /* Send 'FIN+' or 'FIN-' message to peer */ 1443 1444 sock_unlock(tsock); 1445 restart: 1446 if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { 1447 atomic_dec(&tipc_queue_size); 1448 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) { 1449 buf_discard(buf); 1450 goto restart; 1451 } 1452 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); 1453 } 1454 else { 1455 tipc_shutdown(tsock->p->ref); 1456 } 1457 sock_lock(tsock); 1458 1459 /* fall through */ 1460 1461 case SS_DISCONNECTING: 1462 1463 /* Discard any unreceived messages */ 1464 1465 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { 1466 atomic_dec(&tipc_queue_size); 1467 buf_discard(buf); 1468 } 1469 tsock->p->conn_unacked = 0; 1470 1471 /* fall through */ 1472 1473 case SS_CONNECTING: 1474 sock->state = SS_DISCONNECTING; 1475 res = 0; 1476 break; 1477 1478 default: 1479 res = -ENOTCONN; 1480 } 1481 1482 sock_unlock(tsock); 1483 1484 up(&tsock->sem); 1485 return res; 1486 } 1487 1488 /** 1489 * setsockopt - set socket option 1490 * @sock: socket structure 1491 * @lvl: option level 1492 * @opt: option identifier 1493 * @ov: pointer to new option value 1494 * @ol: length of option value 1495 * 1496 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 1497 * (to ease compatibility). 1498 * 1499 * Returns 0 on success, errno otherwise 1500 */ 1501 1502 static int setsockopt(struct socket *sock, 1503 int lvl, int opt, char __user *ov, int ol) 1504 { 1505 struct tipc_sock *tsock = tipc_sk(sock->sk); 1506 u32 value; 1507 int res; 1508 1509 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 1510 return 0; 1511 if (lvl != SOL_TIPC) 1512 return -ENOPROTOOPT; 1513 if (ol < sizeof(value)) 1514 return -EINVAL; 1515 if ((res = get_user(value, (u32 __user *)ov))) 1516 return res; 1517 1518 if (down_interruptible(&tsock->sem)) 1519 return -ERESTARTSYS; 1520 1521 switch (opt) { 1522 case TIPC_IMPORTANCE: 1523 res = tipc_set_portimportance(tsock->p->ref, value); 1524 break; 1525 case TIPC_SRC_DROPPABLE: 1526 if (sock->type != SOCK_STREAM) 1527 res = tipc_set_portunreliable(tsock->p->ref, value); 1528 else 1529 res = -ENOPROTOOPT; 1530 break; 1531 case TIPC_DEST_DROPPABLE: 1532 res = tipc_set_portunreturnable(tsock->p->ref, value); 1533 break; 1534 case TIPC_CONN_TIMEOUT: 1535 sock->sk->sk_rcvtimeo = (value * HZ / 1000); 1536 break; 1537 default: 1538 res = -EINVAL; 1539 } 1540 1541 up(&tsock->sem); 1542 return res; 1543 } 1544 1545 /** 1546 * getsockopt - get socket option 1547 * @sock: socket structure 1548 * @lvl: option level 1549 * @opt: option identifier 1550 * @ov: receptacle for option value 1551 * @ol: receptacle for length of option value 1552 * 1553 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 1554 * (to ease compatibility). 1555 * 1556 * Returns 0 on success, errno otherwise 1557 */ 1558 1559 static int getsockopt(struct socket *sock, 1560 int lvl, int opt, char __user *ov, int __user *ol) 1561 { 1562 struct tipc_sock *tsock = tipc_sk(sock->sk); 1563 int len; 1564 u32 value; 1565 int res; 1566 1567 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 1568 return put_user(0, ol); 1569 if (lvl != SOL_TIPC) 1570 return -ENOPROTOOPT; 1571 if ((res = get_user(len, ol))) 1572 return res; 1573 1574 if (down_interruptible(&tsock->sem)) 1575 return -ERESTARTSYS; 1576 1577 switch (opt) { 1578 case TIPC_IMPORTANCE: 1579 res = tipc_portimportance(tsock->p->ref, &value); 1580 break; 1581 case TIPC_SRC_DROPPABLE: 1582 res = tipc_portunreliable(tsock->p->ref, &value); 1583 break; 1584 case TIPC_DEST_DROPPABLE: 1585 res = tipc_portunreturnable(tsock->p->ref, &value); 1586 break; 1587 case TIPC_CONN_TIMEOUT: 1588 value = (sock->sk->sk_rcvtimeo * 1000) / HZ; 1589 break; 1590 default: 1591 res = -EINVAL; 1592 } 1593 1594 if (res) { 1595 /* "get" failed */ 1596 } 1597 else if (len < sizeof(value)) { 1598 res = -EINVAL; 1599 } 1600 else if ((res = copy_to_user(ov, &value, sizeof(value)))) { 1601 /* couldn't return value */ 1602 } 1603 else { 1604 res = put_user(sizeof(value), ol); 1605 } 1606 1607 up(&tsock->sem); 1608 return res; 1609 } 1610 1611 /** 1612 * Protocol switches for the various types of TIPC sockets 1613 */ 1614 1615 static struct proto_ops msg_ops = { 1616 .owner = THIS_MODULE, 1617 .family = AF_TIPC, 1618 .release = release, 1619 .bind = bind, 1620 .connect = connect, 1621 .socketpair = sock_no_socketpair, 1622 .accept = accept, 1623 .getname = get_name, 1624 .poll = poll, 1625 .ioctl = sock_no_ioctl, 1626 .listen = listen, 1627 .shutdown = shutdown, 1628 .setsockopt = setsockopt, 1629 .getsockopt = getsockopt, 1630 .sendmsg = send_msg, 1631 .recvmsg = recv_msg, 1632 .mmap = sock_no_mmap, 1633 .sendpage = sock_no_sendpage 1634 }; 1635 1636 static struct proto_ops packet_ops = { 1637 .owner = THIS_MODULE, 1638 .family = AF_TIPC, 1639 .release = release, 1640 .bind = bind, 1641 .connect = connect, 1642 .socketpair = sock_no_socketpair, 1643 .accept = accept, 1644 .getname = get_name, 1645 .poll = poll, 1646 .ioctl = sock_no_ioctl, 1647 .listen = listen, 1648 .shutdown = shutdown, 1649 .setsockopt = setsockopt, 1650 .getsockopt = getsockopt, 1651 .sendmsg = send_packet, 1652 .recvmsg = recv_msg, 1653 .mmap = sock_no_mmap, 1654 .sendpage = sock_no_sendpage 1655 }; 1656 1657 static struct proto_ops stream_ops = { 1658 .owner = THIS_MODULE, 1659 .family = AF_TIPC, 1660 .release = release, 1661 .bind = bind, 1662 .connect = connect, 1663 .socketpair = sock_no_socketpair, 1664 .accept = accept, 1665 .getname = get_name, 1666 .poll = poll, 1667 .ioctl = sock_no_ioctl, 1668 .listen = listen, 1669 .shutdown = shutdown, 1670 .setsockopt = setsockopt, 1671 .getsockopt = getsockopt, 1672 .sendmsg = send_stream, 1673 .recvmsg = recv_stream, 1674 .mmap = sock_no_mmap, 1675 .sendpage = sock_no_sendpage 1676 }; 1677 1678 static struct net_proto_family tipc_family_ops = { 1679 .owner = THIS_MODULE, 1680 .family = AF_TIPC, 1681 .create = tipc_create 1682 }; 1683 1684 static struct proto tipc_proto = { 1685 .name = "TIPC", 1686 .owner = THIS_MODULE, 1687 .obj_size = sizeof(struct tipc_sock) 1688 }; 1689 1690 /** 1691 * tipc_socket_init - initialize TIPC socket interface 1692 * 1693 * Returns 0 on success, errno otherwise 1694 */ 1695 int tipc_socket_init(void) 1696 { 1697 int res; 1698 1699 res = proto_register(&tipc_proto, 1); 1700 if (res) { 1701 err("Failed to register TIPC protocol type\n"); 1702 goto out; 1703 } 1704 1705 res = sock_register(&tipc_family_ops); 1706 if (res) { 1707 err("Failed to register TIPC socket type\n"); 1708 proto_unregister(&tipc_proto); 1709 goto out; 1710 } 1711 1712 sockets_enabled = 1; 1713 out: 1714 return res; 1715 } 1716 1717 /** 1718 * tipc_socket_stop - stop TIPC socket interface 1719 */ 1720 void tipc_socket_stop(void) 1721 { 1722 if (!sockets_enabled) 1723 return; 1724 1725 sockets_enabled = 0; 1726 sock_unregister(tipc_family_ops.family); 1727 proto_unregister(&tipc_proto); 1728 } 1729 1730