1 /* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2007, 2012-2017, Ericsson AB 5 * Copyright (c) 2004-2008, 2010-2013, 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/rhashtable.h> 38 #include <linux/sched/signal.h> 39 40 #include "core.h" 41 #include "name_table.h" 42 #include "node.h" 43 #include "link.h" 44 #include "name_distr.h" 45 #include "socket.h" 46 #include "bcast.h" 47 #include "netlink.h" 48 #include "group.h" 49 50 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 51 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 52 #define TIPC_FWD_MSG 1 53 #define TIPC_MAX_PORT 0xffffffff 54 #define TIPC_MIN_PORT 1 55 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */ 56 57 enum { 58 TIPC_LISTEN = TCP_LISTEN, 59 TIPC_ESTABLISHED = TCP_ESTABLISHED, 60 TIPC_OPEN = TCP_CLOSE, 61 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 62 TIPC_CONNECTING = TCP_SYN_SENT, 63 }; 64 65 struct sockaddr_pair { 66 struct sockaddr_tipc sock; 67 struct sockaddr_tipc member; 68 }; 69 70 /** 71 * struct tipc_sock - TIPC socket structure 72 * @sk: socket - interacts with 'port' and with user via the socket API 73 * @conn_type: TIPC type used when connection was established 74 * @conn_instance: TIPC instance used when connection was established 75 * @published: non-zero if port has one or more associated names 76 * @max_pkt: maximum packet size "hint" used when building messages sent by port 77 * @portid: unique port identity in TIPC socket hash table 78 * @phdr: preformatted message header used when sending messages 79 * #cong_links: list of congested links 80 * @publications: list of publications for port 81 * @blocking_link: address of the congested link we are currently sleeping on 82 * @pub_count: total # of publications port has made during its lifetime 83 * @conn_timeout: the time we can wait for an unresponded setup request 84 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 85 * @cong_link_cnt: number of congested links 86 * @snt_unacked: # messages sent by socket, and not yet acked by peer 87 * @rcv_unacked: # messages read by user, but not yet acked back to peer 88 * @peer: 'connected' peer for dgram/rdm 89 * @node: hash table node 90 * @mc_method: cookie for use between socket and broadcast layer 91 * @rcu: rcu struct for tipc_sock 92 */ 93 struct tipc_sock { 94 struct sock sk; 95 u32 conn_type; 96 u32 conn_instance; 97 int published; 98 u32 max_pkt; 99 u32 portid; 100 struct tipc_msg phdr; 101 struct list_head cong_links; 102 struct list_head publications; 103 u32 pub_count; 104 atomic_t dupl_rcvcnt; 105 u16 conn_timeout; 106 bool probe_unacked; 107 u16 cong_link_cnt; 108 u16 snt_unacked; 109 u16 snd_win; 110 u16 peer_caps; 111 u16 rcv_unacked; 112 u16 rcv_win; 113 struct sockaddr_tipc peer; 114 struct rhash_head node; 115 struct tipc_mc_method mc_method; 116 struct rcu_head rcu; 117 struct tipc_group *group; 118 bool group_is_open; 119 }; 120 121 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 122 static void tipc_data_ready(struct sock *sk); 123 static void tipc_write_space(struct sock *sk); 124 static void tipc_sock_destruct(struct sock *sk); 125 static int tipc_release(struct socket *sock); 126 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 127 bool kern); 128 static void tipc_sk_timeout(struct timer_list *t); 129 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 130 struct tipc_name_seq const *seq); 131 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 132 struct tipc_name_seq const *seq); 133 static int tipc_sk_leave(struct tipc_sock *tsk); 134 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 135 static int tipc_sk_insert(struct tipc_sock *tsk); 136 static void tipc_sk_remove(struct tipc_sock *tsk); 137 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 138 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 139 140 static const struct proto_ops packet_ops; 141 static const struct proto_ops stream_ops; 142 static const struct proto_ops msg_ops; 143 static struct proto tipc_proto; 144 static const struct rhashtable_params tsk_rht_params; 145 146 static u32 tsk_own_node(struct tipc_sock *tsk) 147 { 148 return msg_prevnode(&tsk->phdr); 149 } 150 151 static u32 tsk_peer_node(struct tipc_sock *tsk) 152 { 153 return msg_destnode(&tsk->phdr); 154 } 155 156 static u32 tsk_peer_port(struct tipc_sock *tsk) 157 { 158 return msg_destport(&tsk->phdr); 159 } 160 161 static bool tsk_unreliable(struct tipc_sock *tsk) 162 { 163 return msg_src_droppable(&tsk->phdr) != 0; 164 } 165 166 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 167 { 168 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 169 } 170 171 static bool tsk_unreturnable(struct tipc_sock *tsk) 172 { 173 return msg_dest_droppable(&tsk->phdr) != 0; 174 } 175 176 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 177 { 178 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 179 } 180 181 static int tsk_importance(struct tipc_sock *tsk) 182 { 183 return msg_importance(&tsk->phdr); 184 } 185 186 static int tsk_set_importance(struct tipc_sock *tsk, int imp) 187 { 188 if (imp > TIPC_CRITICAL_IMPORTANCE) 189 return -EINVAL; 190 msg_set_importance(&tsk->phdr, (u32)imp); 191 return 0; 192 } 193 194 static struct tipc_sock *tipc_sk(const struct sock *sk) 195 { 196 return container_of(sk, struct tipc_sock, sk); 197 } 198 199 static bool tsk_conn_cong(struct tipc_sock *tsk) 200 { 201 return tsk->snt_unacked > tsk->snd_win; 202 } 203 204 static u16 tsk_blocks(int len) 205 { 206 return ((len / FLOWCTL_BLK_SZ) + 1); 207 } 208 209 /* tsk_blocks(): translate a buffer size in bytes to number of 210 * advertisable blocks, taking into account the ratio truesize(len)/len 211 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 212 */ 213 static u16 tsk_adv_blocks(int len) 214 { 215 return len / FLOWCTL_BLK_SZ / 4; 216 } 217 218 /* tsk_inc(): increment counter for sent or received data 219 * - If block based flow control is not supported by peer we 220 * fall back to message based ditto, incrementing the counter 221 */ 222 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 223 { 224 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 225 return ((msglen / FLOWCTL_BLK_SZ) + 1); 226 return 1; 227 } 228 229 /** 230 * tsk_advance_rx_queue - discard first buffer in socket receive queue 231 * 232 * Caller must hold socket lock 233 */ 234 static void tsk_advance_rx_queue(struct sock *sk) 235 { 236 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 237 } 238 239 /* tipc_sk_respond() : send response message back to sender 240 */ 241 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 242 { 243 u32 selector; 244 u32 dnode; 245 u32 onode = tipc_own_addr(sock_net(sk)); 246 247 if (!tipc_msg_reverse(onode, &skb, err)) 248 return; 249 250 dnode = msg_destnode(buf_msg(skb)); 251 selector = msg_origport(buf_msg(skb)); 252 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 253 } 254 255 /** 256 * tsk_rej_rx_queue - reject all buffers in socket receive queue 257 * 258 * Caller must hold socket lock 259 */ 260 static void tsk_rej_rx_queue(struct sock *sk) 261 { 262 struct sk_buff *skb; 263 264 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 265 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT); 266 } 267 268 static bool tipc_sk_connected(struct sock *sk) 269 { 270 return sk->sk_state == TIPC_ESTABLISHED; 271 } 272 273 /* tipc_sk_type_connectionless - check if the socket is datagram socket 274 * @sk: socket 275 * 276 * Returns true if connection less, false otherwise 277 */ 278 static bool tipc_sk_type_connectionless(struct sock *sk) 279 { 280 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 281 } 282 283 /* tsk_peer_msg - verify if message was sent by connected port's peer 284 * 285 * Handles cases where the node's network address has changed from 286 * the default of <0.0.0> to its configured setting. 287 */ 288 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 289 { 290 struct sock *sk = &tsk->sk; 291 u32 self = tipc_own_addr(sock_net(sk)); 292 u32 peer_port = tsk_peer_port(tsk); 293 u32 orig_node, peer_node; 294 295 if (unlikely(!tipc_sk_connected(sk))) 296 return false; 297 298 if (unlikely(msg_origport(msg) != peer_port)) 299 return false; 300 301 orig_node = msg_orignode(msg); 302 peer_node = tsk_peer_node(tsk); 303 304 if (likely(orig_node == peer_node)) 305 return true; 306 307 if (!orig_node && peer_node == self) 308 return true; 309 310 if (!peer_node && orig_node == self) 311 return true; 312 313 return false; 314 } 315 316 /* tipc_set_sk_state - set the sk_state of the socket 317 * @sk: socket 318 * 319 * Caller must hold socket lock 320 * 321 * Returns 0 on success, errno otherwise 322 */ 323 static int tipc_set_sk_state(struct sock *sk, int state) 324 { 325 int oldsk_state = sk->sk_state; 326 int res = -EINVAL; 327 328 switch (state) { 329 case TIPC_OPEN: 330 res = 0; 331 break; 332 case TIPC_LISTEN: 333 case TIPC_CONNECTING: 334 if (oldsk_state == TIPC_OPEN) 335 res = 0; 336 break; 337 case TIPC_ESTABLISHED: 338 if (oldsk_state == TIPC_CONNECTING || 339 oldsk_state == TIPC_OPEN) 340 res = 0; 341 break; 342 case TIPC_DISCONNECTING: 343 if (oldsk_state == TIPC_CONNECTING || 344 oldsk_state == TIPC_ESTABLISHED) 345 res = 0; 346 break; 347 } 348 349 if (!res) 350 sk->sk_state = state; 351 352 return res; 353 } 354 355 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 356 { 357 struct sock *sk = sock->sk; 358 int err = sock_error(sk); 359 int typ = sock->type; 360 361 if (err) 362 return err; 363 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 364 if (sk->sk_state == TIPC_DISCONNECTING) 365 return -EPIPE; 366 else if (!tipc_sk_connected(sk)) 367 return -ENOTCONN; 368 } 369 if (!*timeout) 370 return -EAGAIN; 371 if (signal_pending(current)) 372 return sock_intr_errno(*timeout); 373 374 return 0; 375 } 376 377 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 378 ({ \ 379 struct sock *sk_; \ 380 int rc_; \ 381 \ 382 while ((rc_ = !(condition_))) { \ 383 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 384 sk_ = (sock_)->sk; \ 385 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 386 if (rc_) \ 387 break; \ 388 prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE); \ 389 release_sock(sk_); \ 390 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 391 sched_annotate_sleep(); \ 392 lock_sock(sk_); \ 393 remove_wait_queue(sk_sleep(sk_), &wait_); \ 394 } \ 395 rc_; \ 396 }) 397 398 /** 399 * tipc_sk_create - create a TIPC socket 400 * @net: network namespace (must be default network) 401 * @sock: pre-allocated socket structure 402 * @protocol: protocol indicator (must be 0) 403 * @kern: caused by kernel or by userspace? 404 * 405 * This routine creates additional data structures used by the TIPC socket, 406 * initializes them, and links them together. 407 * 408 * Returns 0 on success, errno otherwise 409 */ 410 static int tipc_sk_create(struct net *net, struct socket *sock, 411 int protocol, int kern) 412 { 413 const struct proto_ops *ops; 414 struct sock *sk; 415 struct tipc_sock *tsk; 416 struct tipc_msg *msg; 417 418 /* Validate arguments */ 419 if (unlikely(protocol != 0)) 420 return -EPROTONOSUPPORT; 421 422 switch (sock->type) { 423 case SOCK_STREAM: 424 ops = &stream_ops; 425 break; 426 case SOCK_SEQPACKET: 427 ops = &packet_ops; 428 break; 429 case SOCK_DGRAM: 430 case SOCK_RDM: 431 ops = &msg_ops; 432 break; 433 default: 434 return -EPROTOTYPE; 435 } 436 437 /* Allocate socket's protocol area */ 438 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 439 if (sk == NULL) 440 return -ENOMEM; 441 442 tsk = tipc_sk(sk); 443 tsk->max_pkt = MAX_PKT_DEFAULT; 444 INIT_LIST_HEAD(&tsk->publications); 445 INIT_LIST_HEAD(&tsk->cong_links); 446 msg = &tsk->phdr; 447 448 /* Finish initializing socket data structures */ 449 sock->ops = ops; 450 sock_init_data(sock, sk); 451 tipc_set_sk_state(sk, TIPC_OPEN); 452 if (tipc_sk_insert(tsk)) { 453 pr_warn("Socket create failed; port number exhausted\n"); 454 return -EINVAL; 455 } 456 457 /* Ensure tsk is visible before we read own_addr. */ 458 smp_mb(); 459 460 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 461 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 462 463 msg_set_origport(msg, tsk->portid); 464 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 465 sk->sk_shutdown = 0; 466 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 467 sk->sk_rcvbuf = sysctl_tipc_rmem[1]; 468 sk->sk_data_ready = tipc_data_ready; 469 sk->sk_write_space = tipc_write_space; 470 sk->sk_destruct = tipc_sock_destruct; 471 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 472 tsk->group_is_open = true; 473 atomic_set(&tsk->dupl_rcvcnt, 0); 474 475 /* Start out with safe limits until we receive an advertised window */ 476 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 477 tsk->rcv_win = tsk->snd_win; 478 479 if (tipc_sk_type_connectionless(sk)) { 480 tsk_set_unreturnable(tsk, true); 481 if (sock->type == SOCK_DGRAM) 482 tsk_set_unreliable(tsk, true); 483 } 484 485 return 0; 486 } 487 488 static void tipc_sk_callback(struct rcu_head *head) 489 { 490 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 491 492 sock_put(&tsk->sk); 493 } 494 495 /* Caller should hold socket lock for the socket. */ 496 static void __tipc_shutdown(struct socket *sock, int error) 497 { 498 struct sock *sk = sock->sk; 499 struct tipc_sock *tsk = tipc_sk(sk); 500 struct net *net = sock_net(sk); 501 long timeout = CONN_TIMEOUT_DEFAULT; 502 u32 dnode = tsk_peer_node(tsk); 503 struct sk_buff *skb; 504 505 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 506 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 507 !tsk_conn_cong(tsk))); 508 509 /* Remove any pending SYN message */ 510 __skb_queue_purge(&sk->sk_write_queue); 511 512 /* Reject all unreceived messages, except on an active connection 513 * (which disconnects locally & sends a 'FIN+' to peer). 514 */ 515 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { 516 if (TIPC_SKB_CB(skb)->bytes_read) { 517 kfree_skb(skb); 518 continue; 519 } 520 if (!tipc_sk_type_connectionless(sk) && 521 sk->sk_state != TIPC_DISCONNECTING) { 522 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 523 tipc_node_remove_conn(net, dnode, tsk->portid); 524 } 525 tipc_sk_respond(sk, skb, error); 526 } 527 528 if (tipc_sk_type_connectionless(sk)) 529 return; 530 531 if (sk->sk_state != TIPC_DISCONNECTING) { 532 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 533 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 534 tsk_own_node(tsk), tsk_peer_port(tsk), 535 tsk->portid, error); 536 if (skb) 537 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 538 tipc_node_remove_conn(net, dnode, tsk->portid); 539 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 540 } 541 } 542 543 /** 544 * tipc_release - destroy a TIPC socket 545 * @sock: socket to destroy 546 * 547 * This routine cleans up any messages that are still queued on the socket. 548 * For DGRAM and RDM socket types, all queued messages are rejected. 549 * For SEQPACKET and STREAM socket types, the first message is rejected 550 * and any others are discarded. (If the first message on a STREAM socket 551 * is partially-read, it is discarded and the next one is rejected instead.) 552 * 553 * NOTE: Rejected messages are not necessarily returned to the sender! They 554 * are returned or discarded according to the "destination droppable" setting 555 * specified for the message by the sender. 556 * 557 * Returns 0 on success, errno otherwise 558 */ 559 static int tipc_release(struct socket *sock) 560 { 561 struct sock *sk = sock->sk; 562 struct tipc_sock *tsk; 563 564 /* 565 * Exit if socket isn't fully initialized (occurs when a failed accept() 566 * releases a pre-allocated child socket that was never used) 567 */ 568 if (sk == NULL) 569 return 0; 570 571 tsk = tipc_sk(sk); 572 lock_sock(sk); 573 574 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 575 sk->sk_shutdown = SHUTDOWN_MASK; 576 tipc_sk_leave(tsk); 577 tipc_sk_withdraw(tsk, 0, NULL); 578 sk_stop_timer(sk, &sk->sk_timer); 579 tipc_sk_remove(tsk); 580 581 sock_orphan(sk); 582 /* Reject any messages that accumulated in backlog queue */ 583 release_sock(sk); 584 tipc_dest_list_purge(&tsk->cong_links); 585 tsk->cong_link_cnt = 0; 586 call_rcu(&tsk->rcu, tipc_sk_callback); 587 sock->sk = NULL; 588 589 return 0; 590 } 591 592 /** 593 * tipc_bind - associate or disassocate TIPC name(s) with a socket 594 * @sock: socket structure 595 * @uaddr: socket address describing name(s) and desired operation 596 * @uaddr_len: size of socket address data structure 597 * 598 * Name and name sequence binding is indicated using a positive scope value; 599 * a negative scope value unbinds the specified name. Specifying no name 600 * (i.e. a socket address length of 0) unbinds all names from the socket. 601 * 602 * Returns 0 on success, errno otherwise 603 * 604 * NOTE: This routine doesn't need to take the socket lock since it doesn't 605 * access any non-constant socket information. 606 */ 607 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, 608 int uaddr_len) 609 { 610 struct sock *sk = sock->sk; 611 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 612 struct tipc_sock *tsk = tipc_sk(sk); 613 int res = -EINVAL; 614 615 lock_sock(sk); 616 if (unlikely(!uaddr_len)) { 617 res = tipc_sk_withdraw(tsk, 0, NULL); 618 goto exit; 619 } 620 if (tsk->group) { 621 res = -EACCES; 622 goto exit; 623 } 624 if (uaddr_len < sizeof(struct sockaddr_tipc)) { 625 res = -EINVAL; 626 goto exit; 627 } 628 if (addr->family != AF_TIPC) { 629 res = -EAFNOSUPPORT; 630 goto exit; 631 } 632 633 if (addr->addrtype == TIPC_ADDR_NAME) 634 addr->addr.nameseq.upper = addr->addr.nameseq.lower; 635 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { 636 res = -EAFNOSUPPORT; 637 goto exit; 638 } 639 640 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && 641 (addr->addr.nameseq.type != TIPC_TOP_SRV) && 642 (addr->addr.nameseq.type != TIPC_CFG_SRV)) { 643 res = -EACCES; 644 goto exit; 645 } 646 647 res = (addr->scope >= 0) ? 648 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) : 649 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq); 650 exit: 651 release_sock(sk); 652 return res; 653 } 654 655 /** 656 * tipc_getname - get port ID of socket or peer socket 657 * @sock: socket structure 658 * @uaddr: area for returned socket address 659 * @uaddr_len: area for returned length of socket address 660 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 661 * 662 * Returns 0 on success, errno otherwise 663 * 664 * NOTE: This routine doesn't need to take the socket lock since it only 665 * accesses socket information that is unchanging (or which changes in 666 * a completely predictable manner). 667 */ 668 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 669 int peer) 670 { 671 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 672 struct sock *sk = sock->sk; 673 struct tipc_sock *tsk = tipc_sk(sk); 674 675 memset(addr, 0, sizeof(*addr)); 676 if (peer) { 677 if ((!tipc_sk_connected(sk)) && 678 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 679 return -ENOTCONN; 680 addr->addr.id.ref = tsk_peer_port(tsk); 681 addr->addr.id.node = tsk_peer_node(tsk); 682 } else { 683 addr->addr.id.ref = tsk->portid; 684 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 685 } 686 687 addr->addrtype = TIPC_ADDR_ID; 688 addr->family = AF_TIPC; 689 addr->scope = 0; 690 addr->addr.name.domain = 0; 691 692 return sizeof(*addr); 693 } 694 695 /** 696 * tipc_poll - read and possibly block on pollmask 697 * @file: file structure associated with the socket 698 * @sock: socket for which to calculate the poll bits 699 * @wait: ??? 700 * 701 * Returns pollmask value 702 * 703 * COMMENTARY: 704 * It appears that the usual socket locking mechanisms are not useful here 705 * since the pollmask info is potentially out-of-date the moment this routine 706 * exits. TCP and other protocols seem to rely on higher level poll routines 707 * to handle any preventable race conditions, so TIPC will do the same ... 708 * 709 * IMPORTANT: The fact that a read or write operation is indicated does NOT 710 * imply that the operation will succeed, merely that it should be performed 711 * and will not block. 712 */ 713 static __poll_t tipc_poll(struct file *file, struct socket *sock, 714 poll_table *wait) 715 { 716 struct sock *sk = sock->sk; 717 struct tipc_sock *tsk = tipc_sk(sk); 718 __poll_t revents = 0; 719 720 sock_poll_wait(file, sock, wait); 721 722 if (sk->sk_shutdown & RCV_SHUTDOWN) 723 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 724 if (sk->sk_shutdown == SHUTDOWN_MASK) 725 revents |= EPOLLHUP; 726 727 switch (sk->sk_state) { 728 case TIPC_ESTABLISHED: 729 case TIPC_CONNECTING: 730 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 731 revents |= EPOLLOUT; 732 /* fall thru' */ 733 case TIPC_LISTEN: 734 if (!skb_queue_empty(&sk->sk_receive_queue)) 735 revents |= EPOLLIN | EPOLLRDNORM; 736 break; 737 case TIPC_OPEN: 738 if (tsk->group_is_open && !tsk->cong_link_cnt) 739 revents |= EPOLLOUT; 740 if (!tipc_sk_type_connectionless(sk)) 741 break; 742 if (skb_queue_empty(&sk->sk_receive_queue)) 743 break; 744 revents |= EPOLLIN | EPOLLRDNORM; 745 break; 746 case TIPC_DISCONNECTING: 747 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 748 break; 749 } 750 return revents; 751 } 752 753 /** 754 * tipc_sendmcast - send multicast message 755 * @sock: socket structure 756 * @seq: destination address 757 * @msg: message to send 758 * @dlen: length of data to send 759 * @timeout: timeout to wait for wakeup 760 * 761 * Called from function tipc_sendmsg(), which has done all sanity checks 762 * Returns the number of bytes sent on success, or errno 763 */ 764 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, 765 struct msghdr *msg, size_t dlen, long timeout) 766 { 767 struct sock *sk = sock->sk; 768 struct tipc_sock *tsk = tipc_sk(sk); 769 struct tipc_msg *hdr = &tsk->phdr; 770 struct net *net = sock_net(sk); 771 int mtu = tipc_bcast_get_mtu(net); 772 struct tipc_mc_method *method = &tsk->mc_method; 773 struct sk_buff_head pkts; 774 struct tipc_nlist dsts; 775 int rc; 776 777 if (tsk->group) 778 return -EACCES; 779 780 /* Block or return if any destination link is congested */ 781 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 782 if (unlikely(rc)) 783 return rc; 784 785 /* Lookup destination nodes */ 786 tipc_nlist_init(&dsts, tipc_own_addr(net)); 787 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower, 788 seq->upper, &dsts); 789 if (!dsts.local && !dsts.remote) 790 return -EHOSTUNREACH; 791 792 /* Build message header */ 793 msg_set_type(hdr, TIPC_MCAST_MSG); 794 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 795 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 796 msg_set_destport(hdr, 0); 797 msg_set_destnode(hdr, 0); 798 msg_set_nametype(hdr, seq->type); 799 msg_set_namelower(hdr, seq->lower); 800 msg_set_nameupper(hdr, seq->upper); 801 802 /* Build message as chain of buffers */ 803 skb_queue_head_init(&pkts); 804 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 805 806 /* Send message if build was successful */ 807 if (unlikely(rc == dlen)) 808 rc = tipc_mcast_xmit(net, &pkts, method, &dsts, 809 &tsk->cong_link_cnt); 810 811 tipc_nlist_purge(&dsts); 812 813 return rc ? rc : dlen; 814 } 815 816 /** 817 * tipc_send_group_msg - send a message to a member in the group 818 * @net: network namespace 819 * @m: message to send 820 * @mb: group member 821 * @dnode: destination node 822 * @dport: destination port 823 * @dlen: total length of message data 824 */ 825 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 826 struct msghdr *m, struct tipc_member *mb, 827 u32 dnode, u32 dport, int dlen) 828 { 829 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 830 struct tipc_mc_method *method = &tsk->mc_method; 831 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 832 struct tipc_msg *hdr = &tsk->phdr; 833 struct sk_buff_head pkts; 834 int mtu, rc; 835 836 /* Complete message header */ 837 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 838 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 839 msg_set_destport(hdr, dport); 840 msg_set_destnode(hdr, dnode); 841 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 842 843 /* Build message as chain of buffers */ 844 skb_queue_head_init(&pkts); 845 mtu = tipc_node_get_mtu(net, dnode, tsk->portid); 846 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 847 if (unlikely(rc != dlen)) 848 return rc; 849 850 /* Send message */ 851 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 852 if (unlikely(rc == -ELINKCONG)) { 853 tipc_dest_push(&tsk->cong_links, dnode, 0); 854 tsk->cong_link_cnt++; 855 } 856 857 /* Update send window */ 858 tipc_group_update_member(mb, blks); 859 860 /* A broadcast sent within next EXPIRE period must follow same path */ 861 method->rcast = true; 862 method->mandatory = true; 863 return dlen; 864 } 865 866 /** 867 * tipc_send_group_unicast - send message to a member in the group 868 * @sock: socket structure 869 * @m: message to send 870 * @dlen: total length of message data 871 * @timeout: timeout to wait for wakeup 872 * 873 * Called from function tipc_sendmsg(), which has done all sanity checks 874 * Returns the number of bytes sent on success, or errno 875 */ 876 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 877 int dlen, long timeout) 878 { 879 struct sock *sk = sock->sk; 880 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 881 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 882 struct tipc_sock *tsk = tipc_sk(sk); 883 struct tipc_group *grp = tsk->group; 884 struct net *net = sock_net(sk); 885 struct tipc_member *mb = NULL; 886 u32 node, port; 887 int rc; 888 889 node = dest->addr.id.node; 890 port = dest->addr.id.ref; 891 if (!port && !node) 892 return -EHOSTUNREACH; 893 894 /* Block or return if destination link or member is congested */ 895 rc = tipc_wait_for_cond(sock, &timeout, 896 !tipc_dest_find(&tsk->cong_links, node, 0) && 897 !tipc_group_cong(grp, node, port, blks, &mb)); 898 if (unlikely(rc)) 899 return rc; 900 901 if (unlikely(!mb)) 902 return -EHOSTUNREACH; 903 904 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 905 906 return rc ? rc : dlen; 907 } 908 909 /** 910 * tipc_send_group_anycast - send message to any member with given identity 911 * @sock: socket structure 912 * @m: message to send 913 * @dlen: total length of message data 914 * @timeout: timeout to wait for wakeup 915 * 916 * Called from function tipc_sendmsg(), which has done all sanity checks 917 * Returns the number of bytes sent on success, or errno 918 */ 919 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 920 int dlen, long timeout) 921 { 922 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 923 struct sock *sk = sock->sk; 924 struct tipc_sock *tsk = tipc_sk(sk); 925 struct list_head *cong_links = &tsk->cong_links; 926 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 927 struct tipc_group *grp = tsk->group; 928 struct tipc_msg *hdr = &tsk->phdr; 929 struct tipc_member *first = NULL; 930 struct tipc_member *mbr = NULL; 931 struct net *net = sock_net(sk); 932 u32 node, port, exclude; 933 struct list_head dsts; 934 u32 type, inst, scope; 935 int lookups = 0; 936 int dstcnt, rc; 937 bool cong; 938 939 INIT_LIST_HEAD(&dsts); 940 941 type = msg_nametype(hdr); 942 inst = dest->addr.name.name.instance; 943 scope = msg_lookup_scope(hdr); 944 exclude = tipc_group_exclude(grp); 945 946 while (++lookups < 4) { 947 first = NULL; 948 949 /* Look for a non-congested destination member, if any */ 950 while (1) { 951 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 952 &dstcnt, exclude, false)) 953 return -EHOSTUNREACH; 954 tipc_dest_pop(&dsts, &node, &port); 955 cong = tipc_group_cong(grp, node, port, blks, &mbr); 956 if (!cong) 957 break; 958 if (mbr == first) 959 break; 960 if (!first) 961 first = mbr; 962 } 963 964 /* Start over if destination was not in member list */ 965 if (unlikely(!mbr)) 966 continue; 967 968 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 969 break; 970 971 /* Block or return if destination link or member is congested */ 972 rc = tipc_wait_for_cond(sock, &timeout, 973 !tipc_dest_find(cong_links, node, 0) && 974 !tipc_group_cong(grp, node, port, 975 blks, &mbr)); 976 if (unlikely(rc)) 977 return rc; 978 979 /* Send, unless destination disappeared while waiting */ 980 if (likely(mbr)) 981 break; 982 } 983 984 if (unlikely(lookups >= 4)) 985 return -EHOSTUNREACH; 986 987 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 988 989 return rc ? rc : dlen; 990 } 991 992 /** 993 * tipc_send_group_bcast - send message to all members in communication group 994 * @sk: socket structure 995 * @m: message to send 996 * @dlen: total length of message data 997 * @timeout: timeout to wait for wakeup 998 * 999 * Called from function tipc_sendmsg(), which has done all sanity checks 1000 * Returns the number of bytes sent on success, or errno 1001 */ 1002 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1003 int dlen, long timeout) 1004 { 1005 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1006 struct sock *sk = sock->sk; 1007 struct net *net = sock_net(sk); 1008 struct tipc_sock *tsk = tipc_sk(sk); 1009 struct tipc_group *grp = tsk->group; 1010 struct tipc_nlist *dsts = tipc_group_dests(grp); 1011 struct tipc_mc_method *method = &tsk->mc_method; 1012 bool ack = method->mandatory && method->rcast; 1013 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1014 struct tipc_msg *hdr = &tsk->phdr; 1015 int mtu = tipc_bcast_get_mtu(net); 1016 struct sk_buff_head pkts; 1017 int rc = -EHOSTUNREACH; 1018 1019 if (!dsts->local && !dsts->remote) 1020 return -EHOSTUNREACH; 1021 1022 /* Block or return if any destination link or member is congested */ 1023 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt && 1024 !tipc_group_bc_cong(grp, blks)); 1025 if (unlikely(rc)) 1026 return rc; 1027 1028 /* Complete message header */ 1029 if (dest) { 1030 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1031 msg_set_nameinst(hdr, dest->addr.name.name.instance); 1032 } else { 1033 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1034 msg_set_nameinst(hdr, 0); 1035 } 1036 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1037 msg_set_destport(hdr, 0); 1038 msg_set_destnode(hdr, 0); 1039 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(grp)); 1040 1041 /* Avoid getting stuck with repeated forced replicasts */ 1042 msg_set_grp_bc_ack_req(hdr, ack); 1043 1044 /* Build message as chain of buffers */ 1045 skb_queue_head_init(&pkts); 1046 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1047 if (unlikely(rc != dlen)) 1048 return rc; 1049 1050 /* Send message */ 1051 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1052 if (unlikely(rc)) 1053 return rc; 1054 1055 /* Update broadcast sequence number and send windows */ 1056 tipc_group_update_bc_members(tsk->group, blks, ack); 1057 1058 /* Broadcast link is now free to choose method for next broadcast */ 1059 method->mandatory = false; 1060 method->expires = jiffies; 1061 1062 return dlen; 1063 } 1064 1065 /** 1066 * tipc_send_group_mcast - send message to all members with given identity 1067 * @sock: socket structure 1068 * @m: message to send 1069 * @dlen: total length of message data 1070 * @timeout: timeout to wait for wakeup 1071 * 1072 * Called from function tipc_sendmsg(), which has done all sanity checks 1073 * Returns the number of bytes sent on success, or errno 1074 */ 1075 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1076 int dlen, long timeout) 1077 { 1078 struct sock *sk = sock->sk; 1079 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1080 struct tipc_sock *tsk = tipc_sk(sk); 1081 struct tipc_group *grp = tsk->group; 1082 struct tipc_msg *hdr = &tsk->phdr; 1083 struct net *net = sock_net(sk); 1084 u32 type, inst, scope, exclude; 1085 struct list_head dsts; 1086 u32 dstcnt; 1087 1088 INIT_LIST_HEAD(&dsts); 1089 1090 type = msg_nametype(hdr); 1091 inst = dest->addr.name.name.instance; 1092 scope = msg_lookup_scope(hdr); 1093 exclude = tipc_group_exclude(grp); 1094 1095 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 1096 &dstcnt, exclude, true)) 1097 return -EHOSTUNREACH; 1098 1099 if (dstcnt == 1) { 1100 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref); 1101 return tipc_send_group_unicast(sock, m, dlen, timeout); 1102 } 1103 1104 tipc_dest_list_purge(&dsts); 1105 return tipc_send_group_bcast(sock, m, dlen, timeout); 1106 } 1107 1108 /** 1109 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1110 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1111 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1112 * 1113 * Multi-threaded: parallel calls with reference to same queues may occur 1114 */ 1115 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1116 struct sk_buff_head *inputq) 1117 { 1118 u32 self = tipc_own_addr(net); 1119 u32 type, lower, upper, scope; 1120 struct sk_buff *skb, *_skb; 1121 u32 portid, onode; 1122 struct sk_buff_head tmpq; 1123 struct list_head dports; 1124 struct tipc_msg *hdr; 1125 int user, mtyp, hlen; 1126 bool exact; 1127 1128 __skb_queue_head_init(&tmpq); 1129 INIT_LIST_HEAD(&dports); 1130 1131 skb = tipc_skb_peek(arrvq, &inputq->lock); 1132 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1133 hdr = buf_msg(skb); 1134 user = msg_user(hdr); 1135 mtyp = msg_type(hdr); 1136 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1137 onode = msg_orignode(hdr); 1138 type = msg_nametype(hdr); 1139 1140 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1141 spin_lock_bh(&inputq->lock); 1142 if (skb_peek(arrvq) == skb) { 1143 __skb_dequeue(arrvq); 1144 __skb_queue_tail(inputq, skb); 1145 } 1146 kfree_skb(skb); 1147 spin_unlock_bh(&inputq->lock); 1148 continue; 1149 } 1150 1151 /* Group messages require exact scope match */ 1152 if (msg_in_group(hdr)) { 1153 lower = 0; 1154 upper = ~0; 1155 scope = msg_lookup_scope(hdr); 1156 exact = true; 1157 } else { 1158 /* TIPC_NODE_SCOPE means "any scope" in this context */ 1159 if (onode == self) 1160 scope = TIPC_NODE_SCOPE; 1161 else 1162 scope = TIPC_CLUSTER_SCOPE; 1163 exact = false; 1164 lower = msg_namelower(hdr); 1165 upper = msg_nameupper(hdr); 1166 } 1167 1168 /* Create destination port list: */ 1169 tipc_nametbl_mc_lookup(net, type, lower, upper, 1170 scope, exact, &dports); 1171 1172 /* Clone message per destination */ 1173 while (tipc_dest_pop(&dports, NULL, &portid)) { 1174 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1175 if (_skb) { 1176 msg_set_destport(buf_msg(_skb), portid); 1177 __skb_queue_tail(&tmpq, _skb); 1178 continue; 1179 } 1180 pr_warn("Failed to clone mcast rcv buffer\n"); 1181 } 1182 /* Append to inputq if not already done by other thread */ 1183 spin_lock_bh(&inputq->lock); 1184 if (skb_peek(arrvq) == skb) { 1185 skb_queue_splice_tail_init(&tmpq, inputq); 1186 kfree_skb(__skb_dequeue(arrvq)); 1187 } 1188 spin_unlock_bh(&inputq->lock); 1189 __skb_queue_purge(&tmpq); 1190 kfree_skb(skb); 1191 } 1192 tipc_sk_rcv(net, inputq); 1193 } 1194 1195 /** 1196 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1197 * @tsk: receiving socket 1198 * @skb: pointer to message buffer. 1199 */ 1200 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1201 struct sk_buff_head *inputq, 1202 struct sk_buff_head *xmitq) 1203 { 1204 struct tipc_msg *hdr = buf_msg(skb); 1205 u32 onode = tsk_own_node(tsk); 1206 struct sock *sk = &tsk->sk; 1207 int mtyp = msg_type(hdr); 1208 bool conn_cong; 1209 1210 /* Ignore if connection cannot be validated: */ 1211 if (!tsk_peer_msg(tsk, hdr)) 1212 goto exit; 1213 1214 if (unlikely(msg_errcode(hdr))) { 1215 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1216 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1217 tsk_peer_port(tsk)); 1218 sk->sk_state_change(sk); 1219 1220 /* State change is ignored if socket already awake, 1221 * - convert msg to abort msg and add to inqueue 1222 */ 1223 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1224 msg_set_type(hdr, TIPC_CONN_MSG); 1225 msg_set_size(hdr, BASIC_H_SIZE); 1226 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1227 __skb_queue_tail(inputq, skb); 1228 return; 1229 } 1230 1231 tsk->probe_unacked = false; 1232 1233 if (mtyp == CONN_PROBE) { 1234 msg_set_type(hdr, CONN_PROBE_REPLY); 1235 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1236 __skb_queue_tail(xmitq, skb); 1237 return; 1238 } else if (mtyp == CONN_ACK) { 1239 conn_cong = tsk_conn_cong(tsk); 1240 tsk->snt_unacked -= msg_conn_ack(hdr); 1241 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1242 tsk->snd_win = msg_adv_win(hdr); 1243 if (conn_cong) 1244 sk->sk_write_space(sk); 1245 } else if (mtyp != CONN_PROBE_REPLY) { 1246 pr_warn("Received unknown CONN_PROTO msg\n"); 1247 } 1248 exit: 1249 kfree_skb(skb); 1250 } 1251 1252 /** 1253 * tipc_sendmsg - send message in connectionless manner 1254 * @sock: socket structure 1255 * @m: message to send 1256 * @dsz: amount of user data to be sent 1257 * 1258 * Message must have an destination specified explicitly. 1259 * Used for SOCK_RDM and SOCK_DGRAM messages, 1260 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1261 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1262 * 1263 * Returns the number of bytes sent on success, or errno otherwise 1264 */ 1265 static int tipc_sendmsg(struct socket *sock, 1266 struct msghdr *m, size_t dsz) 1267 { 1268 struct sock *sk = sock->sk; 1269 int ret; 1270 1271 lock_sock(sk); 1272 ret = __tipc_sendmsg(sock, m, dsz); 1273 release_sock(sk); 1274 1275 return ret; 1276 } 1277 1278 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1279 { 1280 struct sock *sk = sock->sk; 1281 struct net *net = sock_net(sk); 1282 struct tipc_sock *tsk = tipc_sk(sk); 1283 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1284 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1285 struct list_head *clinks = &tsk->cong_links; 1286 bool syn = !tipc_sk_type_connectionless(sk); 1287 struct tipc_group *grp = tsk->group; 1288 struct tipc_msg *hdr = &tsk->phdr; 1289 struct tipc_name_seq *seq; 1290 struct sk_buff_head pkts; 1291 u32 dport, dnode = 0; 1292 u32 type, inst; 1293 int mtu, rc; 1294 1295 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1296 return -EMSGSIZE; 1297 1298 if (likely(dest)) { 1299 if (unlikely(m->msg_namelen < sizeof(*dest))) 1300 return -EINVAL; 1301 if (unlikely(dest->family != AF_TIPC)) 1302 return -EINVAL; 1303 } 1304 1305 if (grp) { 1306 if (!dest) 1307 return tipc_send_group_bcast(sock, m, dlen, timeout); 1308 if (dest->addrtype == TIPC_ADDR_NAME) 1309 return tipc_send_group_anycast(sock, m, dlen, timeout); 1310 if (dest->addrtype == TIPC_ADDR_ID) 1311 return tipc_send_group_unicast(sock, m, dlen, timeout); 1312 if (dest->addrtype == TIPC_ADDR_MCAST) 1313 return tipc_send_group_mcast(sock, m, dlen, timeout); 1314 return -EINVAL; 1315 } 1316 1317 if (unlikely(!dest)) { 1318 dest = &tsk->peer; 1319 if (!syn || dest->family != AF_TIPC) 1320 return -EDESTADDRREQ; 1321 } 1322 1323 if (unlikely(syn)) { 1324 if (sk->sk_state == TIPC_LISTEN) 1325 return -EPIPE; 1326 if (sk->sk_state != TIPC_OPEN) 1327 return -EISCONN; 1328 if (tsk->published) 1329 return -EOPNOTSUPP; 1330 if (dest->addrtype == TIPC_ADDR_NAME) { 1331 tsk->conn_type = dest->addr.name.name.type; 1332 tsk->conn_instance = dest->addr.name.name.instance; 1333 } 1334 msg_set_syn(hdr, 1); 1335 } 1336 1337 seq = &dest->addr.nameseq; 1338 if (dest->addrtype == TIPC_ADDR_MCAST) 1339 return tipc_sendmcast(sock, seq, m, dlen, timeout); 1340 1341 if (dest->addrtype == TIPC_ADDR_NAME) { 1342 type = dest->addr.name.name.type; 1343 inst = dest->addr.name.name.instance; 1344 dnode = dest->addr.name.domain; 1345 msg_set_type(hdr, TIPC_NAMED_MSG); 1346 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1347 msg_set_nametype(hdr, type); 1348 msg_set_nameinst(hdr, inst); 1349 msg_set_lookup_scope(hdr, tipc_node2scope(dnode)); 1350 dport = tipc_nametbl_translate(net, type, inst, &dnode); 1351 msg_set_destnode(hdr, dnode); 1352 msg_set_destport(hdr, dport); 1353 if (unlikely(!dport && !dnode)) 1354 return -EHOSTUNREACH; 1355 } else if (dest->addrtype == TIPC_ADDR_ID) { 1356 dnode = dest->addr.id.node; 1357 msg_set_type(hdr, TIPC_DIRECT_MSG); 1358 msg_set_lookup_scope(hdr, 0); 1359 msg_set_destnode(hdr, dnode); 1360 msg_set_destport(hdr, dest->addr.id.ref); 1361 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1362 } else { 1363 return -EINVAL; 1364 } 1365 1366 /* Block or return if destination link is congested */ 1367 rc = tipc_wait_for_cond(sock, &timeout, 1368 !tipc_dest_find(clinks, dnode, 0)); 1369 if (unlikely(rc)) 1370 return rc; 1371 1372 skb_queue_head_init(&pkts); 1373 mtu = tipc_node_get_mtu(net, dnode, tsk->portid); 1374 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1375 if (unlikely(rc != dlen)) 1376 return rc; 1377 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) 1378 return -ENOMEM; 1379 1380 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 1381 if (unlikely(rc == -ELINKCONG)) { 1382 tipc_dest_push(clinks, dnode, 0); 1383 tsk->cong_link_cnt++; 1384 rc = 0; 1385 } 1386 1387 if (unlikely(syn && !rc)) 1388 tipc_set_sk_state(sk, TIPC_CONNECTING); 1389 1390 return rc ? rc : dlen; 1391 } 1392 1393 /** 1394 * tipc_sendstream - send stream-oriented data 1395 * @sock: socket structure 1396 * @m: data to send 1397 * @dsz: total length of data to be transmitted 1398 * 1399 * Used for SOCK_STREAM data. 1400 * 1401 * Returns the number of bytes sent on success (or partial success), 1402 * or errno if no data sent 1403 */ 1404 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1405 { 1406 struct sock *sk = sock->sk; 1407 int ret; 1408 1409 lock_sock(sk); 1410 ret = __tipc_sendstream(sock, m, dsz); 1411 release_sock(sk); 1412 1413 return ret; 1414 } 1415 1416 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1417 { 1418 struct sock *sk = sock->sk; 1419 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1420 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1421 struct tipc_sock *tsk = tipc_sk(sk); 1422 struct tipc_msg *hdr = &tsk->phdr; 1423 struct net *net = sock_net(sk); 1424 struct sk_buff_head pkts; 1425 u32 dnode = tsk_peer_node(tsk); 1426 int send, sent = 0; 1427 int rc = 0; 1428 1429 skb_queue_head_init(&pkts); 1430 1431 if (unlikely(dlen > INT_MAX)) 1432 return -EMSGSIZE; 1433 1434 /* Handle implicit connection setup */ 1435 if (unlikely(dest)) { 1436 rc = __tipc_sendmsg(sock, m, dlen); 1437 if (dlen && dlen == rc) { 1438 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1439 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1440 } 1441 return rc; 1442 } 1443 1444 do { 1445 rc = tipc_wait_for_cond(sock, &timeout, 1446 (!tsk->cong_link_cnt && 1447 !tsk_conn_cong(tsk) && 1448 tipc_sk_connected(sk))); 1449 if (unlikely(rc)) 1450 break; 1451 1452 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1453 rc = tipc_msg_build(hdr, m, sent, send, tsk->max_pkt, &pkts); 1454 if (unlikely(rc != send)) 1455 break; 1456 1457 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 1458 if (unlikely(rc == -ELINKCONG)) { 1459 tsk->cong_link_cnt = 1; 1460 rc = 0; 1461 } 1462 if (likely(!rc)) { 1463 tsk->snt_unacked += tsk_inc(tsk, send + MIN_H_SIZE); 1464 sent += send; 1465 } 1466 } while (sent < dlen && !rc); 1467 1468 return sent ? sent : rc; 1469 } 1470 1471 /** 1472 * tipc_send_packet - send a connection-oriented message 1473 * @sock: socket structure 1474 * @m: message to send 1475 * @dsz: length of data to be transmitted 1476 * 1477 * Used for SOCK_SEQPACKET messages. 1478 * 1479 * Returns the number of bytes sent on success, or errno otherwise 1480 */ 1481 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1482 { 1483 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1484 return -EMSGSIZE; 1485 1486 return tipc_sendstream(sock, m, dsz); 1487 } 1488 1489 /* tipc_sk_finish_conn - complete the setup of a connection 1490 */ 1491 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1492 u32 peer_node) 1493 { 1494 struct sock *sk = &tsk->sk; 1495 struct net *net = sock_net(sk); 1496 struct tipc_msg *msg = &tsk->phdr; 1497 1498 msg_set_syn(msg, 0); 1499 msg_set_destnode(msg, peer_node); 1500 msg_set_destport(msg, peer_port); 1501 msg_set_type(msg, TIPC_CONN_MSG); 1502 msg_set_lookup_scope(msg, 0); 1503 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1504 1505 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1506 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1507 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1508 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid); 1509 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1510 __skb_queue_purge(&sk->sk_write_queue); 1511 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1512 return; 1513 1514 /* Fall back to message based flow control */ 1515 tsk->rcv_win = FLOWCTL_MSG_WIN; 1516 tsk->snd_win = FLOWCTL_MSG_WIN; 1517 } 1518 1519 /** 1520 * tipc_sk_set_orig_addr - capture sender's address for received message 1521 * @m: descriptor for message info 1522 * @hdr: received message header 1523 * 1524 * Note: Address is not captured if not requested by receiver. 1525 */ 1526 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1527 { 1528 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1529 struct tipc_msg *hdr = buf_msg(skb); 1530 1531 if (!srcaddr) 1532 return; 1533 1534 srcaddr->sock.family = AF_TIPC; 1535 srcaddr->sock.addrtype = TIPC_ADDR_ID; 1536 srcaddr->sock.scope = 0; 1537 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1538 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1539 srcaddr->sock.addr.name.domain = 0; 1540 m->msg_namelen = sizeof(struct sockaddr_tipc); 1541 1542 if (!msg_in_group(hdr)) 1543 return; 1544 1545 /* Group message users may also want to know sending member's id */ 1546 srcaddr->member.family = AF_TIPC; 1547 srcaddr->member.addrtype = TIPC_ADDR_NAME; 1548 srcaddr->member.scope = 0; 1549 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1550 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1551 srcaddr->member.addr.name.domain = 0; 1552 m->msg_namelen = sizeof(*srcaddr); 1553 } 1554 1555 /** 1556 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1557 * @m: descriptor for message info 1558 * @msg: received message header 1559 * @tsk: TIPC port associated with message 1560 * 1561 * Note: Ancillary data is not captured if not requested by receiver. 1562 * 1563 * Returns 0 if successful, otherwise errno 1564 */ 1565 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg, 1566 struct tipc_sock *tsk) 1567 { 1568 u32 anc_data[3]; 1569 u32 err; 1570 u32 dest_type; 1571 int has_name; 1572 int res; 1573 1574 if (likely(m->msg_controllen == 0)) 1575 return 0; 1576 1577 /* Optionally capture errored message object(s) */ 1578 err = msg ? msg_errcode(msg) : 0; 1579 if (unlikely(err)) { 1580 anc_data[0] = err; 1581 anc_data[1] = msg_data_sz(msg); 1582 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); 1583 if (res) 1584 return res; 1585 if (anc_data[1]) { 1586 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], 1587 msg_data(msg)); 1588 if (res) 1589 return res; 1590 } 1591 } 1592 1593 /* Optionally capture message destination object */ 1594 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 1595 switch (dest_type) { 1596 case TIPC_NAMED_MSG: 1597 has_name = 1; 1598 anc_data[0] = msg_nametype(msg); 1599 anc_data[1] = msg_namelower(msg); 1600 anc_data[2] = msg_namelower(msg); 1601 break; 1602 case TIPC_MCAST_MSG: 1603 has_name = 1; 1604 anc_data[0] = msg_nametype(msg); 1605 anc_data[1] = msg_namelower(msg); 1606 anc_data[2] = msg_nameupper(msg); 1607 break; 1608 case TIPC_CONN_MSG: 1609 has_name = (tsk->conn_type != 0); 1610 anc_data[0] = tsk->conn_type; 1611 anc_data[1] = tsk->conn_instance; 1612 anc_data[2] = tsk->conn_instance; 1613 break; 1614 default: 1615 has_name = 0; 1616 } 1617 if (has_name) { 1618 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); 1619 if (res) 1620 return res; 1621 } 1622 1623 return 0; 1624 } 1625 1626 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1627 { 1628 struct sock *sk = &tsk->sk; 1629 struct net *net = sock_net(sk); 1630 struct sk_buff *skb = NULL; 1631 struct tipc_msg *msg; 1632 u32 peer_port = tsk_peer_port(tsk); 1633 u32 dnode = tsk_peer_node(tsk); 1634 1635 if (!tipc_sk_connected(sk)) 1636 return; 1637 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1638 dnode, tsk_own_node(tsk), peer_port, 1639 tsk->portid, TIPC_OK); 1640 if (!skb) 1641 return; 1642 msg = buf_msg(skb); 1643 msg_set_conn_ack(msg, tsk->rcv_unacked); 1644 tsk->rcv_unacked = 0; 1645 1646 /* Adjust to and advertize the correct window limit */ 1647 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1648 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1649 msg_set_adv_win(msg, tsk->rcv_win); 1650 } 1651 tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg)); 1652 } 1653 1654 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1655 { 1656 struct sock *sk = sock->sk; 1657 DEFINE_WAIT(wait); 1658 long timeo = *timeop; 1659 int err = sock_error(sk); 1660 1661 if (err) 1662 return err; 1663 1664 for (;;) { 1665 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1666 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1667 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1668 err = -ENOTCONN; 1669 break; 1670 } 1671 release_sock(sk); 1672 timeo = schedule_timeout(timeo); 1673 lock_sock(sk); 1674 } 1675 err = 0; 1676 if (!skb_queue_empty(&sk->sk_receive_queue)) 1677 break; 1678 err = -EAGAIN; 1679 if (!timeo) 1680 break; 1681 err = sock_intr_errno(timeo); 1682 if (signal_pending(current)) 1683 break; 1684 1685 err = sock_error(sk); 1686 if (err) 1687 break; 1688 } 1689 finish_wait(sk_sleep(sk), &wait); 1690 *timeop = timeo; 1691 return err; 1692 } 1693 1694 /** 1695 * tipc_recvmsg - receive packet-oriented message 1696 * @m: descriptor for message info 1697 * @buflen: length of user buffer area 1698 * @flags: receive flags 1699 * 1700 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1701 * If the complete message doesn't fit in user area, truncate it. 1702 * 1703 * Returns size of returned message data, errno otherwise 1704 */ 1705 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1706 size_t buflen, int flags) 1707 { 1708 struct sock *sk = sock->sk; 1709 bool connected = !tipc_sk_type_connectionless(sk); 1710 struct tipc_sock *tsk = tipc_sk(sk); 1711 int rc, err, hlen, dlen, copy; 1712 struct sk_buff_head xmitq; 1713 struct tipc_msg *hdr; 1714 struct sk_buff *skb; 1715 bool grp_evt; 1716 long timeout; 1717 1718 /* Catch invalid receive requests */ 1719 if (unlikely(!buflen)) 1720 return -EINVAL; 1721 1722 lock_sock(sk); 1723 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1724 rc = -ENOTCONN; 1725 goto exit; 1726 } 1727 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1728 1729 /* Step rcv queue to first msg with data or error; wait if necessary */ 1730 do { 1731 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1732 if (unlikely(rc)) 1733 goto exit; 1734 skb = skb_peek(&sk->sk_receive_queue); 1735 hdr = buf_msg(skb); 1736 dlen = msg_data_sz(hdr); 1737 hlen = msg_hdr_sz(hdr); 1738 err = msg_errcode(hdr); 1739 grp_evt = msg_is_grp_evt(hdr); 1740 if (likely(dlen || err)) 1741 break; 1742 tsk_advance_rx_queue(sk); 1743 } while (1); 1744 1745 /* Collect msg meta data, including error code and rejected data */ 1746 tipc_sk_set_orig_addr(m, skb); 1747 rc = tipc_sk_anc_data_recv(m, hdr, tsk); 1748 if (unlikely(rc)) 1749 goto exit; 1750 1751 /* Capture data if non-error msg, otherwise just set return value */ 1752 if (likely(!err)) { 1753 copy = min_t(int, dlen, buflen); 1754 if (unlikely(copy != dlen)) 1755 m->msg_flags |= MSG_TRUNC; 1756 rc = skb_copy_datagram_msg(skb, hlen, m, copy); 1757 } else { 1758 copy = 0; 1759 rc = 0; 1760 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) 1761 rc = -ECONNRESET; 1762 } 1763 if (unlikely(rc)) 1764 goto exit; 1765 1766 /* Mark message as group event if applicable */ 1767 if (unlikely(grp_evt)) { 1768 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1769 m->msg_flags |= MSG_EOR; 1770 m->msg_flags |= MSG_OOB; 1771 copy = 0; 1772 } 1773 1774 /* Caption of data or error code/rejected data was successful */ 1775 if (unlikely(flags & MSG_PEEK)) 1776 goto exit; 1777 1778 /* Send group flow control advertisement when applicable */ 1779 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1780 skb_queue_head_init(&xmitq); 1781 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1782 msg_orignode(hdr), msg_origport(hdr), 1783 &xmitq); 1784 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1785 } 1786 1787 tsk_advance_rx_queue(sk); 1788 1789 if (likely(!connected)) 1790 goto exit; 1791 1792 /* Send connection flow control advertisement when applicable */ 1793 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1794 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1795 tipc_sk_send_ack(tsk); 1796 exit: 1797 release_sock(sk); 1798 return rc ? rc : copy; 1799 } 1800 1801 /** 1802 * tipc_recvstream - receive stream-oriented data 1803 * @m: descriptor for message info 1804 * @buflen: total size of user buffer area 1805 * @flags: receive flags 1806 * 1807 * Used for SOCK_STREAM messages only. If not enough data is available 1808 * will optionally wait for more; never truncates data. 1809 * 1810 * Returns size of returned message data, errno otherwise 1811 */ 1812 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 1813 size_t buflen, int flags) 1814 { 1815 struct sock *sk = sock->sk; 1816 struct tipc_sock *tsk = tipc_sk(sk); 1817 struct sk_buff *skb; 1818 struct tipc_msg *hdr; 1819 struct tipc_skb_cb *skb_cb; 1820 bool peek = flags & MSG_PEEK; 1821 int offset, required, copy, copied = 0; 1822 int hlen, dlen, err, rc; 1823 long timeout; 1824 1825 /* Catch invalid receive attempts */ 1826 if (unlikely(!buflen)) 1827 return -EINVAL; 1828 1829 lock_sock(sk); 1830 1831 if (unlikely(sk->sk_state == TIPC_OPEN)) { 1832 rc = -ENOTCONN; 1833 goto exit; 1834 } 1835 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 1836 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1837 1838 do { 1839 /* Look at first msg in receive queue; wait if necessary */ 1840 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1841 if (unlikely(rc)) 1842 break; 1843 skb = skb_peek(&sk->sk_receive_queue); 1844 skb_cb = TIPC_SKB_CB(skb); 1845 hdr = buf_msg(skb); 1846 dlen = msg_data_sz(hdr); 1847 hlen = msg_hdr_sz(hdr); 1848 err = msg_errcode(hdr); 1849 1850 /* Discard any empty non-errored (SYN-) message */ 1851 if (unlikely(!dlen && !err)) { 1852 tsk_advance_rx_queue(sk); 1853 continue; 1854 } 1855 1856 /* Collect msg meta data, incl. error code and rejected data */ 1857 if (!copied) { 1858 tipc_sk_set_orig_addr(m, skb); 1859 rc = tipc_sk_anc_data_recv(m, hdr, tsk); 1860 if (rc) 1861 break; 1862 } 1863 1864 /* Copy data if msg ok, otherwise return error/partial data */ 1865 if (likely(!err)) { 1866 offset = skb_cb->bytes_read; 1867 copy = min_t(int, dlen - offset, buflen - copied); 1868 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 1869 if (unlikely(rc)) 1870 break; 1871 copied += copy; 1872 offset += copy; 1873 if (unlikely(offset < dlen)) { 1874 if (!peek) 1875 skb_cb->bytes_read = offset; 1876 break; 1877 } 1878 } else { 1879 rc = 0; 1880 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 1881 rc = -ECONNRESET; 1882 if (copied || rc) 1883 break; 1884 } 1885 1886 if (unlikely(peek)) 1887 break; 1888 1889 tsk_advance_rx_queue(sk); 1890 1891 /* Send connection flow control advertisement when applicable */ 1892 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1893 if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)) 1894 tipc_sk_send_ack(tsk); 1895 1896 /* Exit if all requested data or FIN/error received */ 1897 if (copied == buflen || err) 1898 break; 1899 1900 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 1901 exit: 1902 release_sock(sk); 1903 return copied ? copied : rc; 1904 } 1905 1906 /** 1907 * tipc_write_space - wake up thread if port congestion is released 1908 * @sk: socket 1909 */ 1910 static void tipc_write_space(struct sock *sk) 1911 { 1912 struct socket_wq *wq; 1913 1914 rcu_read_lock(); 1915 wq = rcu_dereference(sk->sk_wq); 1916 if (skwq_has_sleeper(wq)) 1917 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 1918 EPOLLWRNORM | EPOLLWRBAND); 1919 rcu_read_unlock(); 1920 } 1921 1922 /** 1923 * tipc_data_ready - wake up threads to indicate messages have been received 1924 * @sk: socket 1925 * @len: the length of messages 1926 */ 1927 static void tipc_data_ready(struct sock *sk) 1928 { 1929 struct socket_wq *wq; 1930 1931 rcu_read_lock(); 1932 wq = rcu_dereference(sk->sk_wq); 1933 if (skwq_has_sleeper(wq)) 1934 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 1935 EPOLLRDNORM | EPOLLRDBAND); 1936 rcu_read_unlock(); 1937 } 1938 1939 static void tipc_sock_destruct(struct sock *sk) 1940 { 1941 __skb_queue_purge(&sk->sk_receive_queue); 1942 } 1943 1944 static void tipc_sk_proto_rcv(struct sock *sk, 1945 struct sk_buff_head *inputq, 1946 struct sk_buff_head *xmitq) 1947 { 1948 struct sk_buff *skb = __skb_dequeue(inputq); 1949 struct tipc_sock *tsk = tipc_sk(sk); 1950 struct tipc_msg *hdr = buf_msg(skb); 1951 struct tipc_group *grp = tsk->group; 1952 bool wakeup = false; 1953 1954 switch (msg_user(hdr)) { 1955 case CONN_MANAGER: 1956 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 1957 return; 1958 case SOCK_WAKEUP: 1959 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 1960 tsk->cong_link_cnt--; 1961 wakeup = true; 1962 break; 1963 case GROUP_PROTOCOL: 1964 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 1965 break; 1966 case TOP_SRV: 1967 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 1968 hdr, inputq, xmitq); 1969 break; 1970 default: 1971 break; 1972 } 1973 1974 if (wakeup) 1975 sk->sk_write_space(sk); 1976 1977 kfree_skb(skb); 1978 } 1979 1980 /** 1981 * tipc_sk_filter_connect - check incoming message for a connection-based socket 1982 * @tsk: TIPC socket 1983 * @skb: pointer to message buffer. 1984 * Returns true if message should be added to receive queue, false otherwise 1985 */ 1986 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb) 1987 { 1988 struct sock *sk = &tsk->sk; 1989 struct net *net = sock_net(sk); 1990 struct tipc_msg *hdr = buf_msg(skb); 1991 bool con_msg = msg_connected(hdr); 1992 u32 pport = tsk_peer_port(tsk); 1993 u32 pnode = tsk_peer_node(tsk); 1994 u32 oport = msg_origport(hdr); 1995 u32 onode = msg_orignode(hdr); 1996 int err = msg_errcode(hdr); 1997 unsigned long delay; 1998 1999 if (unlikely(msg_mcast(hdr))) 2000 return false; 2001 2002 switch (sk->sk_state) { 2003 case TIPC_CONNECTING: 2004 /* Setup ACK */ 2005 if (likely(con_msg)) { 2006 if (err) 2007 break; 2008 tipc_sk_finish_conn(tsk, oport, onode); 2009 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2010 /* ACK+ message with data is added to receive queue */ 2011 if (msg_data_sz(hdr)) 2012 return true; 2013 /* Empty ACK-, - wake up sleeping connect() and drop */ 2014 sk->sk_data_ready(sk); 2015 msg_set_dest_droppable(hdr, 1); 2016 return false; 2017 } 2018 /* Ignore connectionless message if not from listening socket */ 2019 if (oport != pport || onode != pnode) 2020 return false; 2021 2022 /* Rejected SYN */ 2023 if (err != TIPC_ERR_OVERLOAD) 2024 break; 2025 2026 /* Prepare for new setup attempt if we have a SYN clone */ 2027 if (skb_queue_empty(&sk->sk_write_queue)) 2028 break; 2029 get_random_bytes(&delay, 2); 2030 delay %= (tsk->conn_timeout / 4); 2031 delay = msecs_to_jiffies(delay + 100); 2032 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2033 return false; 2034 case TIPC_OPEN: 2035 case TIPC_DISCONNECTING: 2036 return false; 2037 case TIPC_LISTEN: 2038 /* Accept only SYN message */ 2039 if (!msg_is_syn(hdr) && 2040 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2041 return false; 2042 if (!con_msg && !err) 2043 return true; 2044 return false; 2045 case TIPC_ESTABLISHED: 2046 /* Accept only connection-based messages sent by peer */ 2047 if (likely(con_msg && !err && pport == oport && pnode == onode)) 2048 return true; 2049 if (!tsk_peer_msg(tsk, hdr)) 2050 return false; 2051 if (!err) 2052 return true; 2053 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2054 tipc_node_remove_conn(net, pnode, tsk->portid); 2055 sk->sk_state_change(sk); 2056 return true; 2057 default: 2058 pr_err("Unknown sk_state %u\n", sk->sk_state); 2059 } 2060 /* Abort connection setup attempt */ 2061 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2062 sk->sk_err = ECONNREFUSED; 2063 sk->sk_state_change(sk); 2064 return true; 2065 } 2066 2067 /** 2068 * rcvbuf_limit - get proper overload limit of socket receive queue 2069 * @sk: socket 2070 * @skb: message 2071 * 2072 * For connection oriented messages, irrespective of importance, 2073 * default queue limit is 2 MB. 2074 * 2075 * For connectionless messages, queue limits are based on message 2076 * importance as follows: 2077 * 2078 * TIPC_LOW_IMPORTANCE (2 MB) 2079 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2080 * TIPC_HIGH_IMPORTANCE (8 MB) 2081 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2082 * 2083 * Returns overload limit according to corresponding message importance 2084 */ 2085 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2086 { 2087 struct tipc_sock *tsk = tipc_sk(sk); 2088 struct tipc_msg *hdr = buf_msg(skb); 2089 2090 if (unlikely(msg_in_group(hdr))) 2091 return sk->sk_rcvbuf; 2092 2093 if (unlikely(!msg_connected(hdr))) 2094 return sk->sk_rcvbuf << msg_importance(hdr); 2095 2096 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2097 return sk->sk_rcvbuf; 2098 2099 return FLOWCTL_MSG_LIM; 2100 } 2101 2102 /** 2103 * tipc_sk_filter_rcv - validate incoming message 2104 * @sk: socket 2105 * @skb: pointer to message. 2106 * 2107 * Enqueues message on receive queue if acceptable; optionally handles 2108 * disconnect indication for a connected socket. 2109 * 2110 * Called with socket lock already taken 2111 * 2112 */ 2113 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2114 struct sk_buff_head *xmitq) 2115 { 2116 bool sk_conn = !tipc_sk_type_connectionless(sk); 2117 struct tipc_sock *tsk = tipc_sk(sk); 2118 struct tipc_group *grp = tsk->group; 2119 struct tipc_msg *hdr = buf_msg(skb); 2120 struct net *net = sock_net(sk); 2121 struct sk_buff_head inputq; 2122 int limit, err = TIPC_OK; 2123 2124 TIPC_SKB_CB(skb)->bytes_read = 0; 2125 __skb_queue_head_init(&inputq); 2126 __skb_queue_tail(&inputq, skb); 2127 2128 if (unlikely(!msg_isdata(hdr))) 2129 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2130 2131 if (unlikely(grp)) 2132 tipc_group_filter_msg(grp, &inputq, xmitq); 2133 2134 /* Validate and add to receive buffer if there is space */ 2135 while ((skb = __skb_dequeue(&inputq))) { 2136 hdr = buf_msg(skb); 2137 limit = rcvbuf_limit(sk, skb); 2138 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) || 2139 (!sk_conn && msg_connected(hdr)) || 2140 (!grp && msg_in_group(hdr))) 2141 err = TIPC_ERR_NO_PORT; 2142 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2143 atomic_inc(&sk->sk_drops); 2144 err = TIPC_ERR_OVERLOAD; 2145 } 2146 2147 if (unlikely(err)) { 2148 tipc_skb_reject(net, err, skb, xmitq); 2149 err = TIPC_OK; 2150 continue; 2151 } 2152 __skb_queue_tail(&sk->sk_receive_queue, skb); 2153 skb_set_owner_r(skb, sk); 2154 sk->sk_data_ready(sk); 2155 } 2156 } 2157 2158 /** 2159 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2160 * @sk: socket 2161 * @skb: message 2162 * 2163 * Caller must hold socket lock 2164 */ 2165 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2166 { 2167 unsigned int before = sk_rmem_alloc_get(sk); 2168 struct sk_buff_head xmitq; 2169 unsigned int added; 2170 2171 __skb_queue_head_init(&xmitq); 2172 2173 tipc_sk_filter_rcv(sk, skb, &xmitq); 2174 added = sk_rmem_alloc_get(sk) - before; 2175 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2176 2177 /* Send pending response/rejected messages, if any */ 2178 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2179 return 0; 2180 } 2181 2182 /** 2183 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2184 * inputq and try adding them to socket or backlog queue 2185 * @inputq: list of incoming buffers with potentially different destinations 2186 * @sk: socket where the buffers should be enqueued 2187 * @dport: port number for the socket 2188 * 2189 * Caller must hold socket lock 2190 */ 2191 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2192 u32 dport, struct sk_buff_head *xmitq) 2193 { 2194 unsigned long time_limit = jiffies + 2; 2195 struct sk_buff *skb; 2196 unsigned int lim; 2197 atomic_t *dcnt; 2198 u32 onode; 2199 2200 while (skb_queue_len(inputq)) { 2201 if (unlikely(time_after_eq(jiffies, time_limit))) 2202 return; 2203 2204 skb = tipc_skb_dequeue(inputq, dport); 2205 if (unlikely(!skb)) 2206 return; 2207 2208 /* Add message directly to receive queue if possible */ 2209 if (!sock_owned_by_user(sk)) { 2210 tipc_sk_filter_rcv(sk, skb, xmitq); 2211 continue; 2212 } 2213 2214 /* Try backlog, compensating for double-counted bytes */ 2215 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2216 if (!sk->sk_backlog.len) 2217 atomic_set(dcnt, 0); 2218 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2219 if (likely(!sk_add_backlog(sk, skb, lim))) 2220 continue; 2221 2222 /* Overload => reject message back to sender */ 2223 onode = tipc_own_addr(sock_net(sk)); 2224 atomic_inc(&sk->sk_drops); 2225 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) 2226 __skb_queue_tail(xmitq, skb); 2227 break; 2228 } 2229 } 2230 2231 /** 2232 * tipc_sk_rcv - handle a chain of incoming buffers 2233 * @inputq: buffer list containing the buffers 2234 * Consumes all buffers in list until inputq is empty 2235 * Note: may be called in multiple threads referring to the same queue 2236 */ 2237 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2238 { 2239 struct sk_buff_head xmitq; 2240 u32 dnode, dport = 0; 2241 int err; 2242 struct tipc_sock *tsk; 2243 struct sock *sk; 2244 struct sk_buff *skb; 2245 2246 __skb_queue_head_init(&xmitq); 2247 while (skb_queue_len(inputq)) { 2248 dport = tipc_skb_peek_port(inputq, dport); 2249 tsk = tipc_sk_lookup(net, dport); 2250 2251 if (likely(tsk)) { 2252 sk = &tsk->sk; 2253 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2254 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2255 spin_unlock_bh(&sk->sk_lock.slock); 2256 } 2257 /* Send pending response/rejected messages, if any */ 2258 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2259 sock_put(sk); 2260 continue; 2261 } 2262 /* No destination socket => dequeue skb if still there */ 2263 skb = tipc_skb_dequeue(inputq, dport); 2264 if (!skb) 2265 return; 2266 2267 /* Try secondary lookup if unresolved named message */ 2268 err = TIPC_ERR_NO_PORT; 2269 if (tipc_msg_lookup_dest(net, skb, &err)) 2270 goto xmit; 2271 2272 /* Prepare for message rejection */ 2273 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2274 continue; 2275 xmit: 2276 dnode = msg_destnode(buf_msg(skb)); 2277 tipc_node_xmit_skb(net, skb, dnode, dport); 2278 } 2279 } 2280 2281 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2282 { 2283 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2284 struct sock *sk = sock->sk; 2285 int done; 2286 2287 do { 2288 int err = sock_error(sk); 2289 if (err) 2290 return err; 2291 if (!*timeo_p) 2292 return -ETIMEDOUT; 2293 if (signal_pending(current)) 2294 return sock_intr_errno(*timeo_p); 2295 2296 add_wait_queue(sk_sleep(sk), &wait); 2297 done = sk_wait_event(sk, timeo_p, 2298 sk->sk_state != TIPC_CONNECTING, &wait); 2299 remove_wait_queue(sk_sleep(sk), &wait); 2300 } while (!done); 2301 return 0; 2302 } 2303 2304 /** 2305 * tipc_connect - establish a connection to another TIPC port 2306 * @sock: socket structure 2307 * @dest: socket address for destination port 2308 * @destlen: size of socket address data structure 2309 * @flags: file-related flags associated with socket 2310 * 2311 * Returns 0 on success, errno otherwise 2312 */ 2313 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2314 int destlen, int flags) 2315 { 2316 struct sock *sk = sock->sk; 2317 struct tipc_sock *tsk = tipc_sk(sk); 2318 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2319 struct msghdr m = {NULL,}; 2320 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2321 int previous; 2322 int res = 0; 2323 2324 if (destlen != sizeof(struct sockaddr_tipc)) 2325 return -EINVAL; 2326 2327 lock_sock(sk); 2328 2329 if (tsk->group) { 2330 res = -EINVAL; 2331 goto exit; 2332 } 2333 2334 if (dst->family == AF_UNSPEC) { 2335 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2336 if (!tipc_sk_type_connectionless(sk)) 2337 res = -EINVAL; 2338 goto exit; 2339 } else if (dst->family != AF_TIPC) { 2340 res = -EINVAL; 2341 } 2342 if (dst->addrtype != TIPC_ADDR_ID && dst->addrtype != TIPC_ADDR_NAME) 2343 res = -EINVAL; 2344 if (res) 2345 goto exit; 2346 2347 /* DGRAM/RDM connect(), just save the destaddr */ 2348 if (tipc_sk_type_connectionless(sk)) { 2349 memcpy(&tsk->peer, dest, destlen); 2350 goto exit; 2351 } 2352 2353 previous = sk->sk_state; 2354 2355 switch (sk->sk_state) { 2356 case TIPC_OPEN: 2357 /* Send a 'SYN-' to destination */ 2358 m.msg_name = dest; 2359 m.msg_namelen = destlen; 2360 2361 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2362 * indicate send_msg() is never blocked. 2363 */ 2364 if (!timeout) 2365 m.msg_flags = MSG_DONTWAIT; 2366 2367 res = __tipc_sendmsg(sock, &m, 0); 2368 if ((res < 0) && (res != -EWOULDBLOCK)) 2369 goto exit; 2370 2371 /* Just entered TIPC_CONNECTING state; the only 2372 * difference is that return value in non-blocking 2373 * case is EINPROGRESS, rather than EALREADY. 2374 */ 2375 res = -EINPROGRESS; 2376 /* fall thru' */ 2377 case TIPC_CONNECTING: 2378 if (!timeout) { 2379 if (previous == TIPC_CONNECTING) 2380 res = -EALREADY; 2381 goto exit; 2382 } 2383 timeout = msecs_to_jiffies(timeout); 2384 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2385 res = tipc_wait_for_connect(sock, &timeout); 2386 break; 2387 case TIPC_ESTABLISHED: 2388 res = -EISCONN; 2389 break; 2390 default: 2391 res = -EINVAL; 2392 } 2393 2394 exit: 2395 release_sock(sk); 2396 return res; 2397 } 2398 2399 /** 2400 * tipc_listen - allow socket to listen for incoming connections 2401 * @sock: socket structure 2402 * @len: (unused) 2403 * 2404 * Returns 0 on success, errno otherwise 2405 */ 2406 static int tipc_listen(struct socket *sock, int len) 2407 { 2408 struct sock *sk = sock->sk; 2409 int res; 2410 2411 lock_sock(sk); 2412 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2413 release_sock(sk); 2414 2415 return res; 2416 } 2417 2418 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2419 { 2420 struct sock *sk = sock->sk; 2421 DEFINE_WAIT(wait); 2422 int err; 2423 2424 /* True wake-one mechanism for incoming connections: only 2425 * one process gets woken up, not the 'whole herd'. 2426 * Since we do not 'race & poll' for established sockets 2427 * anymore, the common case will execute the loop only once. 2428 */ 2429 for (;;) { 2430 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 2431 TASK_INTERRUPTIBLE); 2432 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2433 release_sock(sk); 2434 timeo = schedule_timeout(timeo); 2435 lock_sock(sk); 2436 } 2437 err = 0; 2438 if (!skb_queue_empty(&sk->sk_receive_queue)) 2439 break; 2440 err = -EAGAIN; 2441 if (!timeo) 2442 break; 2443 err = sock_intr_errno(timeo); 2444 if (signal_pending(current)) 2445 break; 2446 } 2447 finish_wait(sk_sleep(sk), &wait); 2448 return err; 2449 } 2450 2451 /** 2452 * tipc_accept - wait for connection request 2453 * @sock: listening socket 2454 * @newsock: new socket that is to be connected 2455 * @flags: file-related flags associated with socket 2456 * 2457 * Returns 0 on success, errno otherwise 2458 */ 2459 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2460 bool kern) 2461 { 2462 struct sock *new_sk, *sk = sock->sk; 2463 struct sk_buff *buf; 2464 struct tipc_sock *new_tsock; 2465 struct tipc_msg *msg; 2466 long timeo; 2467 int res; 2468 2469 lock_sock(sk); 2470 2471 if (sk->sk_state != TIPC_LISTEN) { 2472 res = -EINVAL; 2473 goto exit; 2474 } 2475 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2476 res = tipc_wait_for_accept(sock, timeo); 2477 if (res) 2478 goto exit; 2479 2480 buf = skb_peek(&sk->sk_receive_queue); 2481 2482 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2483 if (res) 2484 goto exit; 2485 security_sk_clone(sock->sk, new_sock->sk); 2486 2487 new_sk = new_sock->sk; 2488 new_tsock = tipc_sk(new_sk); 2489 msg = buf_msg(buf); 2490 2491 /* we lock on new_sk; but lockdep sees the lock on sk */ 2492 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2493 2494 /* 2495 * Reject any stray messages received by new socket 2496 * before the socket lock was taken (very, very unlikely) 2497 */ 2498 tsk_rej_rx_queue(new_sk); 2499 2500 /* Connect new socket to it's peer */ 2501 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2502 2503 tsk_set_importance(new_tsock, msg_importance(msg)); 2504 if (msg_named(msg)) { 2505 new_tsock->conn_type = msg_nametype(msg); 2506 new_tsock->conn_instance = msg_nameinst(msg); 2507 } 2508 2509 /* 2510 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 2511 * Respond to 'SYN+' by queuing it on new socket. 2512 */ 2513 if (!msg_data_sz(msg)) { 2514 struct msghdr m = {NULL,}; 2515 2516 tsk_advance_rx_queue(sk); 2517 __tipc_sendstream(new_sock, &m, 0); 2518 } else { 2519 __skb_dequeue(&sk->sk_receive_queue); 2520 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2521 skb_set_owner_r(buf, new_sk); 2522 } 2523 release_sock(new_sk); 2524 exit: 2525 release_sock(sk); 2526 return res; 2527 } 2528 2529 /** 2530 * tipc_shutdown - shutdown socket connection 2531 * @sock: socket structure 2532 * @how: direction to close (must be SHUT_RDWR) 2533 * 2534 * Terminates connection (if necessary), then purges socket's receive queue. 2535 * 2536 * Returns 0 on success, errno otherwise 2537 */ 2538 static int tipc_shutdown(struct socket *sock, int how) 2539 { 2540 struct sock *sk = sock->sk; 2541 int res; 2542 2543 if (how != SHUT_RDWR) 2544 return -EINVAL; 2545 2546 lock_sock(sk); 2547 2548 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2549 sk->sk_shutdown = SEND_SHUTDOWN; 2550 2551 if (sk->sk_state == TIPC_DISCONNECTING) { 2552 /* Discard any unreceived messages */ 2553 __skb_queue_purge(&sk->sk_receive_queue); 2554 2555 /* Wake up anyone sleeping in poll */ 2556 sk->sk_state_change(sk); 2557 res = 0; 2558 } else { 2559 res = -ENOTCONN; 2560 } 2561 2562 release_sock(sk); 2563 return res; 2564 } 2565 2566 static void tipc_sk_check_probing_state(struct sock *sk, 2567 struct sk_buff_head *list) 2568 { 2569 struct tipc_sock *tsk = tipc_sk(sk); 2570 u32 pnode = tsk_peer_node(tsk); 2571 u32 pport = tsk_peer_port(tsk); 2572 u32 self = tsk_own_node(tsk); 2573 u32 oport = tsk->portid; 2574 struct sk_buff *skb; 2575 2576 if (tsk->probe_unacked) { 2577 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2578 sk->sk_err = ECONNABORTED; 2579 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2580 sk->sk_state_change(sk); 2581 return; 2582 } 2583 /* Prepare new probe */ 2584 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2585 pnode, self, pport, oport, TIPC_OK); 2586 if (skb) 2587 __skb_queue_tail(list, skb); 2588 tsk->probe_unacked = true; 2589 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2590 } 2591 2592 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2593 { 2594 struct tipc_sock *tsk = tipc_sk(sk); 2595 2596 /* Try again later if dest link is congested */ 2597 if (tsk->cong_link_cnt) { 2598 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2599 return; 2600 } 2601 /* Prepare SYN for retransmit */ 2602 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2603 } 2604 2605 static void tipc_sk_timeout(struct timer_list *t) 2606 { 2607 struct sock *sk = from_timer(sk, t, sk_timer); 2608 struct tipc_sock *tsk = tipc_sk(sk); 2609 u32 pnode = tsk_peer_node(tsk); 2610 struct sk_buff_head list; 2611 int rc = 0; 2612 2613 skb_queue_head_init(&list); 2614 bh_lock_sock(sk); 2615 2616 /* Try again later if socket is busy */ 2617 if (sock_owned_by_user(sk)) { 2618 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2619 bh_unlock_sock(sk); 2620 return; 2621 } 2622 2623 if (sk->sk_state == TIPC_ESTABLISHED) 2624 tipc_sk_check_probing_state(sk, &list); 2625 else if (sk->sk_state == TIPC_CONNECTING) 2626 tipc_sk_retry_connect(sk, &list); 2627 2628 bh_unlock_sock(sk); 2629 2630 if (!skb_queue_empty(&list)) 2631 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2632 2633 /* SYN messages may cause link congestion */ 2634 if (rc == -ELINKCONG) { 2635 tipc_dest_push(&tsk->cong_links, pnode, 0); 2636 tsk->cong_link_cnt = 1; 2637 } 2638 sock_put(sk); 2639 } 2640 2641 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 2642 struct tipc_name_seq const *seq) 2643 { 2644 struct sock *sk = &tsk->sk; 2645 struct net *net = sock_net(sk); 2646 struct publication *publ; 2647 u32 key; 2648 2649 if (scope != TIPC_NODE_SCOPE) 2650 scope = TIPC_CLUSTER_SCOPE; 2651 2652 if (tipc_sk_connected(sk)) 2653 return -EINVAL; 2654 key = tsk->portid + tsk->pub_count + 1; 2655 if (key == tsk->portid) 2656 return -EADDRINUSE; 2657 2658 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper, 2659 scope, tsk->portid, key); 2660 if (unlikely(!publ)) 2661 return -EINVAL; 2662 2663 list_add(&publ->binding_sock, &tsk->publications); 2664 tsk->pub_count++; 2665 tsk->published = 1; 2666 return 0; 2667 } 2668 2669 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 2670 struct tipc_name_seq const *seq) 2671 { 2672 struct net *net = sock_net(&tsk->sk); 2673 struct publication *publ; 2674 struct publication *safe; 2675 int rc = -EINVAL; 2676 2677 if (scope != TIPC_NODE_SCOPE) 2678 scope = TIPC_CLUSTER_SCOPE; 2679 2680 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) { 2681 if (seq) { 2682 if (publ->scope != scope) 2683 continue; 2684 if (publ->type != seq->type) 2685 continue; 2686 if (publ->lower != seq->lower) 2687 continue; 2688 if (publ->upper != seq->upper) 2689 break; 2690 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2691 publ->upper, publ->key); 2692 rc = 0; 2693 break; 2694 } 2695 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2696 publ->upper, publ->key); 2697 rc = 0; 2698 } 2699 if (list_empty(&tsk->publications)) 2700 tsk->published = 0; 2701 return rc; 2702 } 2703 2704 /* tipc_sk_reinit: set non-zero address in all existing sockets 2705 * when we go from standalone to network mode. 2706 */ 2707 void tipc_sk_reinit(struct net *net) 2708 { 2709 struct tipc_net *tn = net_generic(net, tipc_net_id); 2710 struct rhashtable_iter iter; 2711 struct tipc_sock *tsk; 2712 struct tipc_msg *msg; 2713 2714 rhashtable_walk_enter(&tn->sk_rht, &iter); 2715 2716 do { 2717 rhashtable_walk_start(&iter); 2718 2719 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2720 spin_lock_bh(&tsk->sk.sk_lock.slock); 2721 msg = &tsk->phdr; 2722 msg_set_prevnode(msg, tipc_own_addr(net)); 2723 msg_set_orignode(msg, tipc_own_addr(net)); 2724 spin_unlock_bh(&tsk->sk.sk_lock.slock); 2725 } 2726 2727 rhashtable_walk_stop(&iter); 2728 } while (tsk == ERR_PTR(-EAGAIN)); 2729 2730 rhashtable_walk_exit(&iter); 2731 } 2732 2733 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2734 { 2735 struct tipc_net *tn = net_generic(net, tipc_net_id); 2736 struct tipc_sock *tsk; 2737 2738 rcu_read_lock(); 2739 tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params); 2740 if (tsk) 2741 sock_hold(&tsk->sk); 2742 rcu_read_unlock(); 2743 2744 return tsk; 2745 } 2746 2747 static int tipc_sk_insert(struct tipc_sock *tsk) 2748 { 2749 struct sock *sk = &tsk->sk; 2750 struct net *net = sock_net(sk); 2751 struct tipc_net *tn = net_generic(net, tipc_net_id); 2752 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 2753 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 2754 2755 while (remaining--) { 2756 portid++; 2757 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 2758 portid = TIPC_MIN_PORT; 2759 tsk->portid = portid; 2760 sock_hold(&tsk->sk); 2761 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 2762 tsk_rht_params)) 2763 return 0; 2764 sock_put(&tsk->sk); 2765 } 2766 2767 return -1; 2768 } 2769 2770 static void tipc_sk_remove(struct tipc_sock *tsk) 2771 { 2772 struct sock *sk = &tsk->sk; 2773 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 2774 2775 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 2776 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 2777 __sock_put(sk); 2778 } 2779 } 2780 2781 static const struct rhashtable_params tsk_rht_params = { 2782 .nelem_hint = 192, 2783 .head_offset = offsetof(struct tipc_sock, node), 2784 .key_offset = offsetof(struct tipc_sock, portid), 2785 .key_len = sizeof(u32), /* portid */ 2786 .max_size = 1048576, 2787 .min_size = 256, 2788 .automatic_shrinking = true, 2789 }; 2790 2791 int tipc_sk_rht_init(struct net *net) 2792 { 2793 struct tipc_net *tn = net_generic(net, tipc_net_id); 2794 2795 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 2796 } 2797 2798 void tipc_sk_rht_destroy(struct net *net) 2799 { 2800 struct tipc_net *tn = net_generic(net, tipc_net_id); 2801 2802 /* Wait for socket readers to complete */ 2803 synchronize_net(); 2804 2805 rhashtable_destroy(&tn->sk_rht); 2806 } 2807 2808 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 2809 { 2810 struct net *net = sock_net(&tsk->sk); 2811 struct tipc_group *grp = tsk->group; 2812 struct tipc_msg *hdr = &tsk->phdr; 2813 struct tipc_name_seq seq; 2814 int rc; 2815 2816 if (mreq->type < TIPC_RESERVED_TYPES) 2817 return -EACCES; 2818 if (mreq->scope > TIPC_NODE_SCOPE) 2819 return -EINVAL; 2820 if (grp) 2821 return -EACCES; 2822 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 2823 if (!grp) 2824 return -ENOMEM; 2825 tsk->group = grp; 2826 msg_set_lookup_scope(hdr, mreq->scope); 2827 msg_set_nametype(hdr, mreq->type); 2828 msg_set_dest_droppable(hdr, true); 2829 seq.type = mreq->type; 2830 seq.lower = mreq->instance; 2831 seq.upper = seq.lower; 2832 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope); 2833 rc = tipc_sk_publish(tsk, mreq->scope, &seq); 2834 if (rc) { 2835 tipc_group_delete(net, grp); 2836 tsk->group = NULL; 2837 return rc; 2838 } 2839 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 2840 tsk->mc_method.rcast = true; 2841 tsk->mc_method.mandatory = true; 2842 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 2843 return rc; 2844 } 2845 2846 static int tipc_sk_leave(struct tipc_sock *tsk) 2847 { 2848 struct net *net = sock_net(&tsk->sk); 2849 struct tipc_group *grp = tsk->group; 2850 struct tipc_name_seq seq; 2851 int scope; 2852 2853 if (!grp) 2854 return -EINVAL; 2855 tipc_group_self(grp, &seq, &scope); 2856 tipc_group_delete(net, grp); 2857 tsk->group = NULL; 2858 tipc_sk_withdraw(tsk, scope, &seq); 2859 return 0; 2860 } 2861 2862 /** 2863 * tipc_setsockopt - set socket option 2864 * @sock: socket structure 2865 * @lvl: option level 2866 * @opt: option identifier 2867 * @ov: pointer to new option value 2868 * @ol: length of option value 2869 * 2870 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 2871 * (to ease compatibility). 2872 * 2873 * Returns 0 on success, errno otherwise 2874 */ 2875 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 2876 char __user *ov, unsigned int ol) 2877 { 2878 struct sock *sk = sock->sk; 2879 struct tipc_sock *tsk = tipc_sk(sk); 2880 struct tipc_group_req mreq; 2881 u32 value = 0; 2882 int res = 0; 2883 2884 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 2885 return 0; 2886 if (lvl != SOL_TIPC) 2887 return -ENOPROTOOPT; 2888 2889 switch (opt) { 2890 case TIPC_IMPORTANCE: 2891 case TIPC_SRC_DROPPABLE: 2892 case TIPC_DEST_DROPPABLE: 2893 case TIPC_CONN_TIMEOUT: 2894 if (ol < sizeof(value)) 2895 return -EINVAL; 2896 if (get_user(value, (u32 __user *)ov)) 2897 return -EFAULT; 2898 break; 2899 case TIPC_GROUP_JOIN: 2900 if (ol < sizeof(mreq)) 2901 return -EINVAL; 2902 if (copy_from_user(&mreq, ov, sizeof(mreq))) 2903 return -EFAULT; 2904 break; 2905 default: 2906 if (ov || ol) 2907 return -EINVAL; 2908 } 2909 2910 lock_sock(sk); 2911 2912 switch (opt) { 2913 case TIPC_IMPORTANCE: 2914 res = tsk_set_importance(tsk, value); 2915 break; 2916 case TIPC_SRC_DROPPABLE: 2917 if (sock->type != SOCK_STREAM) 2918 tsk_set_unreliable(tsk, value); 2919 else 2920 res = -ENOPROTOOPT; 2921 break; 2922 case TIPC_DEST_DROPPABLE: 2923 tsk_set_unreturnable(tsk, value); 2924 break; 2925 case TIPC_CONN_TIMEOUT: 2926 tipc_sk(sk)->conn_timeout = value; 2927 break; 2928 case TIPC_MCAST_BROADCAST: 2929 tsk->mc_method.rcast = false; 2930 tsk->mc_method.mandatory = true; 2931 break; 2932 case TIPC_MCAST_REPLICAST: 2933 tsk->mc_method.rcast = true; 2934 tsk->mc_method.mandatory = true; 2935 break; 2936 case TIPC_GROUP_JOIN: 2937 res = tipc_sk_join(tsk, &mreq); 2938 break; 2939 case TIPC_GROUP_LEAVE: 2940 res = tipc_sk_leave(tsk); 2941 break; 2942 default: 2943 res = -EINVAL; 2944 } 2945 2946 release_sock(sk); 2947 2948 return res; 2949 } 2950 2951 /** 2952 * tipc_getsockopt - get socket option 2953 * @sock: socket structure 2954 * @lvl: option level 2955 * @opt: option identifier 2956 * @ov: receptacle for option value 2957 * @ol: receptacle for length of option value 2958 * 2959 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 2960 * (to ease compatibility). 2961 * 2962 * Returns 0 on success, errno otherwise 2963 */ 2964 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 2965 char __user *ov, int __user *ol) 2966 { 2967 struct sock *sk = sock->sk; 2968 struct tipc_sock *tsk = tipc_sk(sk); 2969 struct tipc_name_seq seq; 2970 int len, scope; 2971 u32 value; 2972 int res; 2973 2974 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 2975 return put_user(0, ol); 2976 if (lvl != SOL_TIPC) 2977 return -ENOPROTOOPT; 2978 res = get_user(len, ol); 2979 if (res) 2980 return res; 2981 2982 lock_sock(sk); 2983 2984 switch (opt) { 2985 case TIPC_IMPORTANCE: 2986 value = tsk_importance(tsk); 2987 break; 2988 case TIPC_SRC_DROPPABLE: 2989 value = tsk_unreliable(tsk); 2990 break; 2991 case TIPC_DEST_DROPPABLE: 2992 value = tsk_unreturnable(tsk); 2993 break; 2994 case TIPC_CONN_TIMEOUT: 2995 value = tsk->conn_timeout; 2996 /* no need to set "res", since already 0 at this point */ 2997 break; 2998 case TIPC_NODE_RECVQ_DEPTH: 2999 value = 0; /* was tipc_queue_size, now obsolete */ 3000 break; 3001 case TIPC_SOCK_RECVQ_DEPTH: 3002 value = skb_queue_len(&sk->sk_receive_queue); 3003 break; 3004 case TIPC_GROUP_JOIN: 3005 seq.type = 0; 3006 if (tsk->group) 3007 tipc_group_self(tsk->group, &seq, &scope); 3008 value = seq.type; 3009 break; 3010 default: 3011 res = -EINVAL; 3012 } 3013 3014 release_sock(sk); 3015 3016 if (res) 3017 return res; /* "get" failed */ 3018 3019 if (len < sizeof(value)) 3020 return -EINVAL; 3021 3022 if (copy_to_user(ov, &value, sizeof(value))) 3023 return -EFAULT; 3024 3025 return put_user(sizeof(value), ol); 3026 } 3027 3028 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3029 { 3030 struct net *net = sock_net(sock->sk); 3031 struct tipc_sioc_nodeid_req nr = {0}; 3032 struct tipc_sioc_ln_req lnr; 3033 void __user *argp = (void __user *)arg; 3034 3035 switch (cmd) { 3036 case SIOCGETLINKNAME: 3037 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3038 return -EFAULT; 3039 if (!tipc_node_get_linkname(net, 3040 lnr.bearer_id & 0xffff, lnr.peer, 3041 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3042 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3043 return -EFAULT; 3044 return 0; 3045 } 3046 return -EADDRNOTAVAIL; 3047 case SIOCGETNODEID: 3048 if (copy_from_user(&nr, argp, sizeof(nr))) 3049 return -EFAULT; 3050 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3051 return -EADDRNOTAVAIL; 3052 if (copy_to_user(argp, &nr, sizeof(nr))) 3053 return -EFAULT; 3054 return 0; 3055 default: 3056 return -ENOIOCTLCMD; 3057 } 3058 } 3059 3060 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3061 { 3062 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3063 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3064 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3065 3066 tsk1->peer.family = AF_TIPC; 3067 tsk1->peer.addrtype = TIPC_ADDR_ID; 3068 tsk1->peer.scope = TIPC_NODE_SCOPE; 3069 tsk1->peer.addr.id.ref = tsk2->portid; 3070 tsk1->peer.addr.id.node = onode; 3071 tsk2->peer.family = AF_TIPC; 3072 tsk2->peer.addrtype = TIPC_ADDR_ID; 3073 tsk2->peer.scope = TIPC_NODE_SCOPE; 3074 tsk2->peer.addr.id.ref = tsk1->portid; 3075 tsk2->peer.addr.id.node = onode; 3076 3077 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3078 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3079 return 0; 3080 } 3081 3082 /* Protocol switches for the various types of TIPC sockets */ 3083 3084 static const struct proto_ops msg_ops = { 3085 .owner = THIS_MODULE, 3086 .family = AF_TIPC, 3087 .release = tipc_release, 3088 .bind = tipc_bind, 3089 .connect = tipc_connect, 3090 .socketpair = tipc_socketpair, 3091 .accept = sock_no_accept, 3092 .getname = tipc_getname, 3093 .poll = tipc_poll, 3094 .ioctl = tipc_ioctl, 3095 .listen = sock_no_listen, 3096 .shutdown = tipc_shutdown, 3097 .setsockopt = tipc_setsockopt, 3098 .getsockopt = tipc_getsockopt, 3099 .sendmsg = tipc_sendmsg, 3100 .recvmsg = tipc_recvmsg, 3101 .mmap = sock_no_mmap, 3102 .sendpage = sock_no_sendpage 3103 }; 3104 3105 static const struct proto_ops packet_ops = { 3106 .owner = THIS_MODULE, 3107 .family = AF_TIPC, 3108 .release = tipc_release, 3109 .bind = tipc_bind, 3110 .connect = tipc_connect, 3111 .socketpair = tipc_socketpair, 3112 .accept = tipc_accept, 3113 .getname = tipc_getname, 3114 .poll = tipc_poll, 3115 .ioctl = tipc_ioctl, 3116 .listen = tipc_listen, 3117 .shutdown = tipc_shutdown, 3118 .setsockopt = tipc_setsockopt, 3119 .getsockopt = tipc_getsockopt, 3120 .sendmsg = tipc_send_packet, 3121 .recvmsg = tipc_recvmsg, 3122 .mmap = sock_no_mmap, 3123 .sendpage = sock_no_sendpage 3124 }; 3125 3126 static const struct proto_ops stream_ops = { 3127 .owner = THIS_MODULE, 3128 .family = AF_TIPC, 3129 .release = tipc_release, 3130 .bind = tipc_bind, 3131 .connect = tipc_connect, 3132 .socketpair = tipc_socketpair, 3133 .accept = tipc_accept, 3134 .getname = tipc_getname, 3135 .poll = tipc_poll, 3136 .ioctl = tipc_ioctl, 3137 .listen = tipc_listen, 3138 .shutdown = tipc_shutdown, 3139 .setsockopt = tipc_setsockopt, 3140 .getsockopt = tipc_getsockopt, 3141 .sendmsg = tipc_sendstream, 3142 .recvmsg = tipc_recvstream, 3143 .mmap = sock_no_mmap, 3144 .sendpage = sock_no_sendpage 3145 }; 3146 3147 static const struct net_proto_family tipc_family_ops = { 3148 .owner = THIS_MODULE, 3149 .family = AF_TIPC, 3150 .create = tipc_sk_create 3151 }; 3152 3153 static struct proto tipc_proto = { 3154 .name = "TIPC", 3155 .owner = THIS_MODULE, 3156 .obj_size = sizeof(struct tipc_sock), 3157 .sysctl_rmem = sysctl_tipc_rmem 3158 }; 3159 3160 /** 3161 * tipc_socket_init - initialize TIPC socket interface 3162 * 3163 * Returns 0 on success, errno otherwise 3164 */ 3165 int tipc_socket_init(void) 3166 { 3167 int res; 3168 3169 res = proto_register(&tipc_proto, 1); 3170 if (res) { 3171 pr_err("Failed to register TIPC protocol type\n"); 3172 goto out; 3173 } 3174 3175 res = sock_register(&tipc_family_ops); 3176 if (res) { 3177 pr_err("Failed to register TIPC socket type\n"); 3178 proto_unregister(&tipc_proto); 3179 goto out; 3180 } 3181 out: 3182 return res; 3183 } 3184 3185 /** 3186 * tipc_socket_stop - stop TIPC socket interface 3187 */ 3188 void tipc_socket_stop(void) 3189 { 3190 sock_unregister(tipc_family_ops.family); 3191 proto_unregister(&tipc_proto); 3192 } 3193 3194 /* Caller should hold socket lock for the passed tipc socket. */ 3195 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3196 { 3197 u32 peer_node; 3198 u32 peer_port; 3199 struct nlattr *nest; 3200 3201 peer_node = tsk_peer_node(tsk); 3202 peer_port = tsk_peer_port(tsk); 3203 3204 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON); 3205 3206 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3207 goto msg_full; 3208 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3209 goto msg_full; 3210 3211 if (tsk->conn_type != 0) { 3212 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3213 goto msg_full; 3214 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) 3215 goto msg_full; 3216 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) 3217 goto msg_full; 3218 } 3219 nla_nest_end(skb, nest); 3220 3221 return 0; 3222 3223 msg_full: 3224 nla_nest_cancel(skb, nest); 3225 3226 return -EMSGSIZE; 3227 } 3228 3229 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3230 *tsk) 3231 { 3232 struct net *net = sock_net(skb->sk); 3233 struct sock *sk = &tsk->sk; 3234 3235 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3236 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3237 return -EMSGSIZE; 3238 3239 if (tipc_sk_connected(sk)) { 3240 if (__tipc_nl_add_sk_con(skb, tsk)) 3241 return -EMSGSIZE; 3242 } else if (!list_empty(&tsk->publications)) { 3243 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3244 return -EMSGSIZE; 3245 } 3246 return 0; 3247 } 3248 3249 /* Caller should hold socket lock for the passed tipc socket. */ 3250 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3251 struct tipc_sock *tsk) 3252 { 3253 struct nlattr *attrs; 3254 void *hdr; 3255 3256 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3257 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3258 if (!hdr) 3259 goto msg_cancel; 3260 3261 attrs = nla_nest_start(skb, TIPC_NLA_SOCK); 3262 if (!attrs) 3263 goto genlmsg_cancel; 3264 3265 if (__tipc_nl_add_sk_info(skb, tsk)) 3266 goto attr_msg_cancel; 3267 3268 nla_nest_end(skb, attrs); 3269 genlmsg_end(skb, hdr); 3270 3271 return 0; 3272 3273 attr_msg_cancel: 3274 nla_nest_cancel(skb, attrs); 3275 genlmsg_cancel: 3276 genlmsg_cancel(skb, hdr); 3277 msg_cancel: 3278 return -EMSGSIZE; 3279 } 3280 3281 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3282 int (*skb_handler)(struct sk_buff *skb, 3283 struct netlink_callback *cb, 3284 struct tipc_sock *tsk)) 3285 { 3286 struct rhashtable_iter *iter = (void *)cb->args[4]; 3287 struct tipc_sock *tsk; 3288 int err; 3289 3290 rhashtable_walk_start(iter); 3291 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3292 if (IS_ERR(tsk)) { 3293 err = PTR_ERR(tsk); 3294 if (err == -EAGAIN) { 3295 err = 0; 3296 continue; 3297 } 3298 break; 3299 } 3300 3301 sock_hold(&tsk->sk); 3302 rhashtable_walk_stop(iter); 3303 lock_sock(&tsk->sk); 3304 err = skb_handler(skb, cb, tsk); 3305 if (err) { 3306 release_sock(&tsk->sk); 3307 sock_put(&tsk->sk); 3308 goto out; 3309 } 3310 release_sock(&tsk->sk); 3311 rhashtable_walk_start(iter); 3312 sock_put(&tsk->sk); 3313 } 3314 rhashtable_walk_stop(iter); 3315 out: 3316 return skb->len; 3317 } 3318 EXPORT_SYMBOL(tipc_nl_sk_walk); 3319 3320 int tipc_dump_start(struct netlink_callback *cb) 3321 { 3322 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3323 } 3324 EXPORT_SYMBOL(tipc_dump_start); 3325 3326 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3327 { 3328 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3329 struct rhashtable_iter *iter = (void *)cb->args[4]; 3330 struct tipc_net *tn = tipc_net(net); 3331 3332 if (!iter) { 3333 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3334 if (!iter) 3335 return -ENOMEM; 3336 3337 cb->args[4] = (long)iter; 3338 } 3339 3340 rhashtable_walk_enter(&tn->sk_rht, iter); 3341 return 0; 3342 } 3343 3344 int tipc_dump_done(struct netlink_callback *cb) 3345 { 3346 struct rhashtable_iter *hti = (void *)cb->args[4]; 3347 3348 rhashtable_walk_exit(hti); 3349 kfree(hti); 3350 return 0; 3351 } 3352 EXPORT_SYMBOL(tipc_dump_done); 3353 3354 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3355 struct tipc_sock *tsk, u32 sk_filter_state, 3356 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3357 { 3358 struct sock *sk = &tsk->sk; 3359 struct nlattr *attrs; 3360 struct nlattr *stat; 3361 3362 /*filter response w.r.t sk_state*/ 3363 if (!(sk_filter_state & (1 << sk->sk_state))) 3364 return 0; 3365 3366 attrs = nla_nest_start(skb, TIPC_NLA_SOCK); 3367 if (!attrs) 3368 goto msg_cancel; 3369 3370 if (__tipc_nl_add_sk_info(skb, tsk)) 3371 goto attr_msg_cancel; 3372 3373 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3374 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3375 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3376 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3377 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3378 sock_i_uid(sk))) || 3379 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3380 tipc_diag_gen_cookie(sk), 3381 TIPC_NLA_SOCK_PAD)) 3382 goto attr_msg_cancel; 3383 3384 stat = nla_nest_start(skb, TIPC_NLA_SOCK_STAT); 3385 if (!stat) 3386 goto attr_msg_cancel; 3387 3388 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3389 skb_queue_len(&sk->sk_receive_queue)) || 3390 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3391 skb_queue_len(&sk->sk_write_queue)) || 3392 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3393 atomic_read(&sk->sk_drops))) 3394 goto stat_msg_cancel; 3395 3396 if (tsk->cong_link_cnt && 3397 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3398 goto stat_msg_cancel; 3399 3400 if (tsk_conn_cong(tsk) && 3401 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3402 goto stat_msg_cancel; 3403 3404 nla_nest_end(skb, stat); 3405 3406 if (tsk->group) 3407 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3408 goto stat_msg_cancel; 3409 3410 nla_nest_end(skb, attrs); 3411 3412 return 0; 3413 3414 stat_msg_cancel: 3415 nla_nest_cancel(skb, stat); 3416 attr_msg_cancel: 3417 nla_nest_cancel(skb, attrs); 3418 msg_cancel: 3419 return -EMSGSIZE; 3420 } 3421 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3422 3423 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3424 { 3425 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3426 } 3427 3428 /* Caller should hold socket lock for the passed tipc socket. */ 3429 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3430 struct netlink_callback *cb, 3431 struct publication *publ) 3432 { 3433 void *hdr; 3434 struct nlattr *attrs; 3435 3436 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3437 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3438 if (!hdr) 3439 goto msg_cancel; 3440 3441 attrs = nla_nest_start(skb, TIPC_NLA_PUBL); 3442 if (!attrs) 3443 goto genlmsg_cancel; 3444 3445 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3446 goto attr_msg_cancel; 3447 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) 3448 goto attr_msg_cancel; 3449 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) 3450 goto attr_msg_cancel; 3451 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) 3452 goto attr_msg_cancel; 3453 3454 nla_nest_end(skb, attrs); 3455 genlmsg_end(skb, hdr); 3456 3457 return 0; 3458 3459 attr_msg_cancel: 3460 nla_nest_cancel(skb, attrs); 3461 genlmsg_cancel: 3462 genlmsg_cancel(skb, hdr); 3463 msg_cancel: 3464 return -EMSGSIZE; 3465 } 3466 3467 /* Caller should hold socket lock for the passed tipc socket. */ 3468 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3469 struct netlink_callback *cb, 3470 struct tipc_sock *tsk, u32 *last_publ) 3471 { 3472 int err; 3473 struct publication *p; 3474 3475 if (*last_publ) { 3476 list_for_each_entry(p, &tsk->publications, binding_sock) { 3477 if (p->key == *last_publ) 3478 break; 3479 } 3480 if (p->key != *last_publ) { 3481 /* We never set seq or call nl_dump_check_consistent() 3482 * this means that setting prev_seq here will cause the 3483 * consistence check to fail in the netlink callback 3484 * handler. Resulting in the last NLMSG_DONE message 3485 * having the NLM_F_DUMP_INTR flag set. 3486 */ 3487 cb->prev_seq = 1; 3488 *last_publ = 0; 3489 return -EPIPE; 3490 } 3491 } else { 3492 p = list_first_entry(&tsk->publications, struct publication, 3493 binding_sock); 3494 } 3495 3496 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3497 err = __tipc_nl_add_sk_publ(skb, cb, p); 3498 if (err) { 3499 *last_publ = p->key; 3500 return err; 3501 } 3502 } 3503 *last_publ = 0; 3504 3505 return 0; 3506 } 3507 3508 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3509 { 3510 int err; 3511 u32 tsk_portid = cb->args[0]; 3512 u32 last_publ = cb->args[1]; 3513 u32 done = cb->args[2]; 3514 struct net *net = sock_net(skb->sk); 3515 struct tipc_sock *tsk; 3516 3517 if (!tsk_portid) { 3518 struct nlattr **attrs; 3519 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3520 3521 err = tipc_nlmsg_parse(cb->nlh, &attrs); 3522 if (err) 3523 return err; 3524 3525 if (!attrs[TIPC_NLA_SOCK]) 3526 return -EINVAL; 3527 3528 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX, 3529 attrs[TIPC_NLA_SOCK], 3530 tipc_nl_sock_policy, NULL); 3531 if (err) 3532 return err; 3533 3534 if (!sock[TIPC_NLA_SOCK_REF]) 3535 return -EINVAL; 3536 3537 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3538 } 3539 3540 if (done) 3541 return 0; 3542 3543 tsk = tipc_sk_lookup(net, tsk_portid); 3544 if (!tsk) 3545 return -EINVAL; 3546 3547 lock_sock(&tsk->sk); 3548 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3549 if (!err) 3550 done = 1; 3551 release_sock(&tsk->sk); 3552 sock_put(&tsk->sk); 3553 3554 cb->args[0] = tsk_portid; 3555 cb->args[1] = last_publ; 3556 cb->args[2] = done; 3557 3558 return skb->len; 3559 } 3560