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#include "trace.h" 50 51#define NAGLE_START_INIT 4 52#define NAGLE_START_MAX 1024 53#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 54#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 55#define TIPC_MAX_PORT 0xffffffff 56#define TIPC_MIN_PORT 1 57#define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */ 58 59enum { 60 TIPC_LISTEN = TCP_LISTEN, 61 TIPC_ESTABLISHED = TCP_ESTABLISHED, 62 TIPC_OPEN = TCP_CLOSE, 63 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 64 TIPC_CONNECTING = TCP_SYN_SENT, 65}; 66 67struct sockaddr_pair { 68 struct sockaddr_tipc sock; 69 struct sockaddr_tipc member; 70}; 71 72/** 73 * struct tipc_sock - TIPC socket structure 74 * @sk: socket - interacts with 'port' and with user via the socket API 75 * @conn_type: TIPC type used when connection was established 76 * @conn_instance: TIPC instance used when connection was established 77 * @published: non-zero if port has one or more associated names 78 * @max_pkt: maximum packet size "hint" used when building messages sent by port 79 * @maxnagle: maximum size of msg which can be subject to nagle 80 * @portid: unique port identity in TIPC socket hash table 81 * @phdr: preformatted message header used when sending messages 82 * #cong_links: list of congested links 83 * @publications: list of publications for port 84 * @blocking_link: address of the congested link we are currently sleeping on 85 * @pub_count: total # of publications port has made during its lifetime 86 * @conn_timeout: the time we can wait for an unresponded setup request 87 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 88 * @cong_link_cnt: number of congested links 89 * @snt_unacked: # messages sent by socket, and not yet acked by peer 90 * @rcv_unacked: # messages read by user, but not yet acked back to peer 91 * @peer: 'connected' peer for dgram/rdm 92 * @node: hash table node 93 * @mc_method: cookie for use between socket and broadcast layer 94 * @rcu: rcu struct for tipc_sock 95 */ 96struct tipc_sock { 97 struct sock sk; 98 u32 conn_type; 99 u32 conn_instance; 100 int published; 101 u32 max_pkt; 102 u32 maxnagle; 103 u32 portid; 104 struct tipc_msg phdr; 105 struct list_head cong_links; 106 struct list_head publications; 107 u32 pub_count; 108 atomic_t dupl_rcvcnt; 109 u16 conn_timeout; 110 bool probe_unacked; 111 u16 cong_link_cnt; 112 u16 snt_unacked; 113 u16 snd_win; 114 u16 peer_caps; 115 u16 rcv_unacked; 116 u16 rcv_win; 117 struct sockaddr_tipc peer; 118 struct rhash_head node; 119 struct tipc_mc_method mc_method; 120 struct rcu_head rcu; 121 struct tipc_group *group; 122 u32 oneway; 123 u32 nagle_start; 124 u16 snd_backlog; 125 u16 msg_acc; 126 u16 pkt_cnt; 127 bool expect_ack; 128 bool nodelay; 129 bool group_is_open; 130}; 131 132static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 133static void tipc_data_ready(struct sock *sk); 134static void tipc_write_space(struct sock *sk); 135static void tipc_sock_destruct(struct sock *sk); 136static int tipc_release(struct socket *sock); 137static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 138 bool kern); 139static void tipc_sk_timeout(struct timer_list *t); 140static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 141 struct tipc_name_seq const *seq); 142static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 143 struct tipc_name_seq const *seq); 144static int tipc_sk_leave(struct tipc_sock *tsk); 145static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 146static int tipc_sk_insert(struct tipc_sock *tsk); 147static void tipc_sk_remove(struct tipc_sock *tsk); 148static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 149static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 150static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 151static int tipc_wait_for_connect(struct socket *sock, long *timeo_p); 152 153static const struct proto_ops packet_ops; 154static const struct proto_ops stream_ops; 155static const struct proto_ops msg_ops; 156static struct proto tipc_proto; 157static const struct rhashtable_params tsk_rht_params; 158 159static u32 tsk_own_node(struct tipc_sock *tsk) 160{ 161 return msg_prevnode(&tsk->phdr); 162} 163 164static u32 tsk_peer_node(struct tipc_sock *tsk) 165{ 166 return msg_destnode(&tsk->phdr); 167} 168 169static u32 tsk_peer_port(struct tipc_sock *tsk) 170{ 171 return msg_destport(&tsk->phdr); 172} 173 174static bool tsk_unreliable(struct tipc_sock *tsk) 175{ 176 return msg_src_droppable(&tsk->phdr) != 0; 177} 178 179static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 180{ 181 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 182} 183 184static bool tsk_unreturnable(struct tipc_sock *tsk) 185{ 186 return msg_dest_droppable(&tsk->phdr) != 0; 187} 188 189static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 190{ 191 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 192} 193 194static int tsk_importance(struct tipc_sock *tsk) 195{ 196 return msg_importance(&tsk->phdr); 197} 198 199static struct tipc_sock *tipc_sk(const struct sock *sk) 200{ 201 return container_of(sk, struct tipc_sock, sk); 202} 203 204int tsk_set_importance(struct sock *sk, int imp) 205{ 206 if (imp > TIPC_CRITICAL_IMPORTANCE) 207 return -EINVAL; 208 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 209 return 0; 210} 211 212static bool tsk_conn_cong(struct tipc_sock *tsk) 213{ 214 return tsk->snt_unacked > tsk->snd_win; 215} 216 217static u16 tsk_blocks(int len) 218{ 219 return ((len / FLOWCTL_BLK_SZ) + 1); 220} 221 222/* tsk_blocks(): translate a buffer size in bytes to number of 223 * advertisable blocks, taking into account the ratio truesize(len)/len 224 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 225 */ 226static u16 tsk_adv_blocks(int len) 227{ 228 return len / FLOWCTL_BLK_SZ / 4; 229} 230 231/* tsk_inc(): increment counter for sent or received data 232 * - If block based flow control is not supported by peer we 233 * fall back to message based ditto, incrementing the counter 234 */ 235static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 236{ 237 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 238 return ((msglen / FLOWCTL_BLK_SZ) + 1); 239 return 1; 240} 241 242/* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 243 */ 244static void tsk_set_nagle(struct tipc_sock *tsk) 245{ 246 struct sock *sk = &tsk->sk; 247 248 tsk->maxnagle = 0; 249 if (sk->sk_type != SOCK_STREAM) 250 return; 251 if (tsk->nodelay) 252 return; 253 if (!(tsk->peer_caps & TIPC_NAGLE)) 254 return; 255 /* Limit node local buffer size to avoid receive queue overflow */ 256 if (tsk->max_pkt == MAX_MSG_SIZE) 257 tsk->maxnagle = 1500; 258 else 259 tsk->maxnagle = tsk->max_pkt; 260} 261 262/** 263 * tsk_advance_rx_queue - discard first buffer in socket receive queue 264 * 265 * Caller must hold socket lock 266 */ 267static void tsk_advance_rx_queue(struct sock *sk) 268{ 269 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 270 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 271} 272 273/* tipc_sk_respond() : send response message back to sender 274 */ 275static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 276{ 277 u32 selector; 278 u32 dnode; 279 u32 onode = tipc_own_addr(sock_net(sk)); 280 281 if (!tipc_msg_reverse(onode, &skb, err)) 282 return; 283 284 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 285 dnode = msg_destnode(buf_msg(skb)); 286 selector = msg_origport(buf_msg(skb)); 287 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 288} 289 290/** 291 * tsk_rej_rx_queue - reject all buffers in socket receive queue 292 * 293 * Caller must hold socket lock 294 */ 295static void tsk_rej_rx_queue(struct sock *sk, int error) 296{ 297 struct sk_buff *skb; 298 299 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 300 tipc_sk_respond(sk, skb, error); 301} 302 303static bool tipc_sk_connected(const struct sock *sk) 304{ 305 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED; 306} 307 308/* tipc_sk_type_connectionless - check if the socket is datagram socket 309 * @sk: socket 310 * 311 * Returns true if connection less, false otherwise 312 */ 313static bool tipc_sk_type_connectionless(struct sock *sk) 314{ 315 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 316} 317 318/* tsk_peer_msg - verify if message was sent by connected port's peer 319 * 320 * Handles cases where the node's network address has changed from 321 * the default of <0.0.0> to its configured setting. 322 */ 323static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 324{ 325 struct sock *sk = &tsk->sk; 326 u32 self = tipc_own_addr(sock_net(sk)); 327 u32 peer_port = tsk_peer_port(tsk); 328 u32 orig_node, peer_node; 329 330 if (unlikely(!tipc_sk_connected(sk))) 331 return false; 332 333 if (unlikely(msg_origport(msg) != peer_port)) 334 return false; 335 336 orig_node = msg_orignode(msg); 337 peer_node = tsk_peer_node(tsk); 338 339 if (likely(orig_node == peer_node)) 340 return true; 341 342 if (!orig_node && peer_node == self) 343 return true; 344 345 if (!peer_node && orig_node == self) 346 return true; 347 348 return false; 349} 350 351/* tipc_set_sk_state - set the sk_state of the socket 352 * @sk: socket 353 * 354 * Caller must hold socket lock 355 * 356 * Returns 0 on success, errno otherwise 357 */ 358static int tipc_set_sk_state(struct sock *sk, int state) 359{ 360 int oldsk_state = sk->sk_state; 361 int res = -EINVAL; 362 363 switch (state) { 364 case TIPC_OPEN: 365 res = 0; 366 break; 367 case TIPC_LISTEN: 368 case TIPC_CONNECTING: 369 if (oldsk_state == TIPC_OPEN) 370 res = 0; 371 break; 372 case TIPC_ESTABLISHED: 373 if (oldsk_state == TIPC_CONNECTING || 374 oldsk_state == TIPC_OPEN) 375 res = 0; 376 break; 377 case TIPC_DISCONNECTING: 378 if (oldsk_state == TIPC_CONNECTING || 379 oldsk_state == TIPC_ESTABLISHED) 380 res = 0; 381 break; 382 } 383 384 if (!res) 385 sk->sk_state = state; 386 387 return res; 388} 389 390static int tipc_sk_sock_err(struct socket *sock, long *timeout) 391{ 392 struct sock *sk = sock->sk; 393 int err = sock_error(sk); 394 int typ = sock->type; 395 396 if (err) 397 return err; 398 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 399 if (sk->sk_state == TIPC_DISCONNECTING) 400 return -EPIPE; 401 else if (!tipc_sk_connected(sk)) 402 return -ENOTCONN; 403 } 404 if (!*timeout) 405 return -EAGAIN; 406 if (signal_pending(current)) 407 return sock_intr_errno(*timeout); 408 409 return 0; 410} 411 412#define tipc_wait_for_cond(sock_, timeo_, condition_) \ 413({ \ 414 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 415 struct sock *sk_; \ 416 int rc_; \ 417 \ 418 while ((rc_ = !(condition_))) { \ 419 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 420 smp_rmb(); \ 421 sk_ = (sock_)->sk; \ 422 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 423 if (rc_) \ 424 break; \ 425 add_wait_queue(sk_sleep(sk_), &wait_); \ 426 release_sock(sk_); \ 427 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 428 sched_annotate_sleep(); \ 429 lock_sock(sk_); \ 430 remove_wait_queue(sk_sleep(sk_), &wait_); \ 431 } \ 432 rc_; \ 433}) 434 435/** 436 * tipc_sk_create - create a TIPC socket 437 * @net: network namespace (must be default network) 438 * @sock: pre-allocated socket structure 439 * @protocol: protocol indicator (must be 0) 440 * @kern: caused by kernel or by userspace? 441 * 442 * This routine creates additional data structures used by the TIPC socket, 443 * initializes them, and links them together. 444 * 445 * Returns 0 on success, errno otherwise 446 */ 447static int tipc_sk_create(struct net *net, struct socket *sock, 448 int protocol, int kern) 449{ 450 const struct proto_ops *ops; 451 struct sock *sk; 452 struct tipc_sock *tsk; 453 struct tipc_msg *msg; 454 455 /* Validate arguments */ 456 if (unlikely(protocol != 0)) 457 return -EPROTONOSUPPORT; 458 459 switch (sock->type) { 460 case SOCK_STREAM: 461 ops = &stream_ops; 462 break; 463 case SOCK_SEQPACKET: 464 ops = &packet_ops; 465 break; 466 case SOCK_DGRAM: 467 case SOCK_RDM: 468 ops = &msg_ops; 469 break; 470 default: 471 return -EPROTOTYPE; 472 } 473 474 /* Allocate socket's protocol area */ 475 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 476 if (sk == NULL) 477 return -ENOMEM; 478 479 tsk = tipc_sk(sk); 480 tsk->max_pkt = MAX_PKT_DEFAULT; 481 tsk->maxnagle = 0; 482 tsk->nagle_start = NAGLE_START_INIT; 483 INIT_LIST_HEAD(&tsk->publications); 484 INIT_LIST_HEAD(&tsk->cong_links); 485 msg = &tsk->phdr; 486 487 /* Finish initializing socket data structures */ 488 sock->ops = ops; 489 sock_init_data(sock, sk); 490 tipc_set_sk_state(sk, TIPC_OPEN); 491 if (tipc_sk_insert(tsk)) { 492 sk_free(sk); 493 pr_warn("Socket create failed; port number exhausted\n"); 494 return -EINVAL; 495 } 496 497 /* Ensure tsk is visible before we read own_addr. */ 498 smp_mb(); 499 500 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 501 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 502 503 msg_set_origport(msg, tsk->portid); 504 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 505 sk->sk_shutdown = 0; 506 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 507 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]); 508 sk->sk_data_ready = tipc_data_ready; 509 sk->sk_write_space = tipc_write_space; 510 sk->sk_destruct = tipc_sock_destruct; 511 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 512 tsk->group_is_open = true; 513 atomic_set(&tsk->dupl_rcvcnt, 0); 514 515 /* Start out with safe limits until we receive an advertised window */ 516 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 517 tsk->rcv_win = tsk->snd_win; 518 519 if (tipc_sk_type_connectionless(sk)) { 520 tsk_set_unreturnable(tsk, true); 521 if (sock->type == SOCK_DGRAM) 522 tsk_set_unreliable(tsk, true); 523 } 524 __skb_queue_head_init(&tsk->mc_method.deferredq); 525 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 526 return 0; 527} 528 529static void tipc_sk_callback(struct rcu_head *head) 530{ 531 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 532 533 sock_put(&tsk->sk); 534} 535 536/* Caller should hold socket lock for the socket. */ 537static void __tipc_shutdown(struct socket *sock, int error) 538{ 539 struct sock *sk = sock->sk; 540 struct tipc_sock *tsk = tipc_sk(sk); 541 struct net *net = sock_net(sk); 542 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 543 u32 dnode = tsk_peer_node(tsk); 544 struct sk_buff *skb; 545 546 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 547 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 548 !tsk_conn_cong(tsk))); 549 550 /* Push out delayed messages if in Nagle mode */ 551 tipc_sk_push_backlog(tsk, false); 552 /* Remove pending SYN */ 553 __skb_queue_purge(&sk->sk_write_queue); 554 555 /* Remove partially received buffer if any */ 556 skb = skb_peek(&sk->sk_receive_queue); 557 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 558 __skb_unlink(skb, &sk->sk_receive_queue); 559 kfree_skb(skb); 560 } 561 562 /* Reject all unreceived messages if connectionless */ 563 if (tipc_sk_type_connectionless(sk)) { 564 tsk_rej_rx_queue(sk, error); 565 return; 566 } 567 568 switch (sk->sk_state) { 569 case TIPC_CONNECTING: 570 case TIPC_ESTABLISHED: 571 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 572 tipc_node_remove_conn(net, dnode, tsk->portid); 573 /* Send a FIN+/- to its peer */ 574 skb = __skb_dequeue(&sk->sk_receive_queue); 575 if (skb) { 576 __skb_queue_purge(&sk->sk_receive_queue); 577 tipc_sk_respond(sk, skb, error); 578 break; 579 } 580 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 581 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 582 tsk_own_node(tsk), tsk_peer_port(tsk), 583 tsk->portid, error); 584 if (skb) 585 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 586 break; 587 case TIPC_LISTEN: 588 /* Reject all SYN messages */ 589 tsk_rej_rx_queue(sk, error); 590 break; 591 default: 592 __skb_queue_purge(&sk->sk_receive_queue); 593 break; 594 } 595} 596 597/** 598 * tipc_release - destroy a TIPC socket 599 * @sock: socket to destroy 600 * 601 * This routine cleans up any messages that are still queued on the socket. 602 * For DGRAM and RDM socket types, all queued messages are rejected. 603 * For SEQPACKET and STREAM socket types, the first message is rejected 604 * and any others are discarded. (If the first message on a STREAM socket 605 * is partially-read, it is discarded and the next one is rejected instead.) 606 * 607 * NOTE: Rejected messages are not necessarily returned to the sender! They 608 * are returned or discarded according to the "destination droppable" setting 609 * specified for the message by the sender. 610 * 611 * Returns 0 on success, errno otherwise 612 */ 613static int tipc_release(struct socket *sock) 614{ 615 struct sock *sk = sock->sk; 616 struct tipc_sock *tsk; 617 618 /* 619 * Exit if socket isn't fully initialized (occurs when a failed accept() 620 * releases a pre-allocated child socket that was never used) 621 */ 622 if (sk == NULL) 623 return 0; 624 625 tsk = tipc_sk(sk); 626 lock_sock(sk); 627 628 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 629 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 630 sk->sk_shutdown = SHUTDOWN_MASK; 631 tipc_sk_leave(tsk); 632 tipc_sk_withdraw(tsk, 0, NULL); 633 __skb_queue_purge(&tsk->mc_method.deferredq); 634 sk_stop_timer(sk, &sk->sk_timer); 635 tipc_sk_remove(tsk); 636 637 sock_orphan(sk); 638 /* Reject any messages that accumulated in backlog queue */ 639 release_sock(sk); 640 tipc_dest_list_purge(&tsk->cong_links); 641 tsk->cong_link_cnt = 0; 642 call_rcu(&tsk->rcu, tipc_sk_callback); 643 sock->sk = NULL; 644 645 return 0; 646} 647 648/** 649 * tipc_bind - associate or disassocate TIPC name(s) with a socket 650 * @sock: socket structure 651 * @uaddr: socket address describing name(s) and desired operation 652 * @uaddr_len: size of socket address data structure 653 * 654 * Name and name sequence binding is indicated using a positive scope value; 655 * a negative scope value unbinds the specified name. Specifying no name 656 * (i.e. a socket address length of 0) unbinds all names from the socket. 657 * 658 * Returns 0 on success, errno otherwise 659 * 660 * NOTE: This routine doesn't need to take the socket lock since it doesn't 661 * access any non-constant socket information. 662 */ 663static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, 664 int uaddr_len) 665{ 666 struct sock *sk = sock->sk; 667 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 668 struct tipc_sock *tsk = tipc_sk(sk); 669 int res = -EINVAL; 670 671 lock_sock(sk); 672 if (unlikely(!uaddr_len)) { 673 res = tipc_sk_withdraw(tsk, 0, NULL); 674 goto exit; 675 } 676 if (tsk->group) { 677 res = -EACCES; 678 goto exit; 679 } 680 if (uaddr_len < sizeof(struct sockaddr_tipc)) { 681 res = -EINVAL; 682 goto exit; 683 } 684 if (addr->family != AF_TIPC) { 685 res = -EAFNOSUPPORT; 686 goto exit; 687 } 688 689 if (addr->addrtype == TIPC_ADDR_NAME) 690 addr->addr.nameseq.upper = addr->addr.nameseq.lower; 691 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { 692 res = -EAFNOSUPPORT; 693 goto exit; 694 } 695 696 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && 697 (addr->addr.nameseq.type != TIPC_TOP_SRV) && 698 (addr->addr.nameseq.type != TIPC_CFG_SRV)) { 699 res = -EACCES; 700 goto exit; 701 } 702 703 res = (addr->scope >= 0) ? 704 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) : 705 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq); 706exit: 707 release_sock(sk); 708 return res; 709} 710 711/** 712 * tipc_getname - get port ID of socket or peer socket 713 * @sock: socket structure 714 * @uaddr: area for returned socket address 715 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 716 * 717 * Returns 0 on success, errno otherwise 718 * 719 * NOTE: This routine doesn't need to take the socket lock since it only 720 * accesses socket information that is unchanging (or which changes in 721 * a completely predictable manner). 722 */ 723static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 724 int peer) 725{ 726 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 727 struct sock *sk = sock->sk; 728 struct tipc_sock *tsk = tipc_sk(sk); 729 730 memset(addr, 0, sizeof(*addr)); 731 if (peer) { 732 if ((!tipc_sk_connected(sk)) && 733 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 734 return -ENOTCONN; 735 addr->addr.id.ref = tsk_peer_port(tsk); 736 addr->addr.id.node = tsk_peer_node(tsk); 737 } else { 738 addr->addr.id.ref = tsk->portid; 739 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 740 } 741 742 addr->addrtype = TIPC_ADDR_ID; 743 addr->family = AF_TIPC; 744 addr->scope = 0; 745 addr->addr.name.domain = 0; 746 747 return sizeof(*addr); 748} 749 750/** 751 * tipc_poll - read and possibly block on pollmask 752 * @file: file structure associated with the socket 753 * @sock: socket for which to calculate the poll bits 754 * @wait: ??? 755 * 756 * Returns pollmask value 757 * 758 * COMMENTARY: 759 * It appears that the usual socket locking mechanisms are not useful here 760 * since the pollmask info is potentially out-of-date the moment this routine 761 * exits. TCP and other protocols seem to rely on higher level poll routines 762 * to handle any preventable race conditions, so TIPC will do the same ... 763 * 764 * IMPORTANT: The fact that a read or write operation is indicated does NOT 765 * imply that the operation will succeed, merely that it should be performed 766 * and will not block. 767 */ 768static __poll_t tipc_poll(struct file *file, struct socket *sock, 769 poll_table *wait) 770{ 771 struct sock *sk = sock->sk; 772 struct tipc_sock *tsk = tipc_sk(sk); 773 __poll_t revents = 0; 774 775 sock_poll_wait(file, sock, wait); 776 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 777 778 if (sk->sk_shutdown & RCV_SHUTDOWN) 779 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 780 if (sk->sk_shutdown == SHUTDOWN_MASK) 781 revents |= EPOLLHUP; 782 783 switch (sk->sk_state) { 784 case TIPC_ESTABLISHED: 785 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 786 revents |= EPOLLOUT; 787 fallthrough; 788 case TIPC_LISTEN: 789 case TIPC_CONNECTING: 790 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 791 revents |= EPOLLIN | EPOLLRDNORM; 792 break; 793 case TIPC_OPEN: 794 if (tsk->group_is_open && !tsk->cong_link_cnt) 795 revents |= EPOLLOUT; 796 if (!tipc_sk_type_connectionless(sk)) 797 break; 798 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 799 break; 800 revents |= EPOLLIN | EPOLLRDNORM; 801 break; 802 case TIPC_DISCONNECTING: 803 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 804 break; 805 } 806 return revents; 807} 808 809/** 810 * tipc_sendmcast - send multicast message 811 * @sock: socket structure 812 * @seq: destination address 813 * @msg: message to send 814 * @dlen: length of data to send 815 * @timeout: timeout to wait for wakeup 816 * 817 * Called from function tipc_sendmsg(), which has done all sanity checks 818 * Returns the number of bytes sent on success, or errno 819 */ 820static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, 821 struct msghdr *msg, size_t dlen, long timeout) 822{ 823 struct sock *sk = sock->sk; 824 struct tipc_sock *tsk = tipc_sk(sk); 825 struct tipc_msg *hdr = &tsk->phdr; 826 struct net *net = sock_net(sk); 827 int mtu = tipc_bcast_get_mtu(net); 828 struct tipc_mc_method *method = &tsk->mc_method; 829 struct sk_buff_head pkts; 830 struct tipc_nlist dsts; 831 int rc; 832 833 if (tsk->group) 834 return -EACCES; 835 836 /* Block or return if any destination link is congested */ 837 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 838 if (unlikely(rc)) 839 return rc; 840 841 /* Lookup destination nodes */ 842 tipc_nlist_init(&dsts, tipc_own_addr(net)); 843 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower, 844 seq->upper, &dsts); 845 if (!dsts.local && !dsts.remote) 846 return -EHOSTUNREACH; 847 848 /* Build message header */ 849 msg_set_type(hdr, TIPC_MCAST_MSG); 850 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 851 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 852 msg_set_destport(hdr, 0); 853 msg_set_destnode(hdr, 0); 854 msg_set_nametype(hdr, seq->type); 855 msg_set_namelower(hdr, seq->lower); 856 msg_set_nameupper(hdr, seq->upper); 857 858 /* Build message as chain of buffers */ 859 __skb_queue_head_init(&pkts); 860 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 861 862 /* Send message if build was successful */ 863 if (unlikely(rc == dlen)) { 864 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 865 TIPC_DUMP_SK_SNDQ, " "); 866 rc = tipc_mcast_xmit(net, &pkts, method, &dsts, 867 &tsk->cong_link_cnt); 868 } 869 870 tipc_nlist_purge(&dsts); 871 872 return rc ? rc : dlen; 873} 874 875/** 876 * tipc_send_group_msg - send a message to a member in the group 877 * @net: network namespace 878 * @m: message to send 879 * @mb: group member 880 * @dnode: destination node 881 * @dport: destination port 882 * @dlen: total length of message data 883 */ 884static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 885 struct msghdr *m, struct tipc_member *mb, 886 u32 dnode, u32 dport, int dlen) 887{ 888 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 889 struct tipc_mc_method *method = &tsk->mc_method; 890 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 891 struct tipc_msg *hdr = &tsk->phdr; 892 struct sk_buff_head pkts; 893 int mtu, rc; 894 895 /* Complete message header */ 896 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 897 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 898 msg_set_destport(hdr, dport); 899 msg_set_destnode(hdr, dnode); 900 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 901 902 /* Build message as chain of buffers */ 903 __skb_queue_head_init(&pkts); 904 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 905 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 906 if (unlikely(rc != dlen)) 907 return rc; 908 909 /* Send message */ 910 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 911 if (unlikely(rc == -ELINKCONG)) { 912 tipc_dest_push(&tsk->cong_links, dnode, 0); 913 tsk->cong_link_cnt++; 914 } 915 916 /* Update send window */ 917 tipc_group_update_member(mb, blks); 918 919 /* A broadcast sent within next EXPIRE period must follow same path */ 920 method->rcast = true; 921 method->mandatory = true; 922 return dlen; 923} 924 925/** 926 * tipc_send_group_unicast - send message to a member in the group 927 * @sock: socket structure 928 * @m: message to send 929 * @dlen: total length of message data 930 * @timeout: timeout to wait for wakeup 931 * 932 * Called from function tipc_sendmsg(), which has done all sanity checks 933 * Returns the number of bytes sent on success, or errno 934 */ 935static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 936 int dlen, long timeout) 937{ 938 struct sock *sk = sock->sk; 939 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 940 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 941 struct tipc_sock *tsk = tipc_sk(sk); 942 struct net *net = sock_net(sk); 943 struct tipc_member *mb = NULL; 944 u32 node, port; 945 int rc; 946 947 node = dest->addr.id.node; 948 port = dest->addr.id.ref; 949 if (!port && !node) 950 return -EHOSTUNREACH; 951 952 /* Block or return if destination link or member is congested */ 953 rc = tipc_wait_for_cond(sock, &timeout, 954 !tipc_dest_find(&tsk->cong_links, node, 0) && 955 tsk->group && 956 !tipc_group_cong(tsk->group, node, port, blks, 957 &mb)); 958 if (unlikely(rc)) 959 return rc; 960 961 if (unlikely(!mb)) 962 return -EHOSTUNREACH; 963 964 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 965 966 return rc ? rc : dlen; 967} 968 969/** 970 * tipc_send_group_anycast - send message to any member with given identity 971 * @sock: socket structure 972 * @m: message to send 973 * @dlen: total length of message data 974 * @timeout: timeout to wait for wakeup 975 * 976 * Called from function tipc_sendmsg(), which has done all sanity checks 977 * Returns the number of bytes sent on success, or errno 978 */ 979static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 980 int dlen, long timeout) 981{ 982 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 983 struct sock *sk = sock->sk; 984 struct tipc_sock *tsk = tipc_sk(sk); 985 struct list_head *cong_links = &tsk->cong_links; 986 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 987 struct tipc_msg *hdr = &tsk->phdr; 988 struct tipc_member *first = NULL; 989 struct tipc_member *mbr = NULL; 990 struct net *net = sock_net(sk); 991 u32 node, port, exclude; 992 struct list_head dsts; 993 u32 type, inst, scope; 994 int lookups = 0; 995 int dstcnt, rc; 996 bool cong; 997 998 INIT_LIST_HEAD(&dsts); 999 1000 type = msg_nametype(hdr); 1001 inst = dest->addr.name.name.instance; 1002 scope = msg_lookup_scope(hdr); 1003 1004 while (++lookups < 4) { 1005 exclude = tipc_group_exclude(tsk->group); 1006 1007 first = NULL; 1008 1009 /* Look for a non-congested destination member, if any */ 1010 while (1) { 1011 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 1012 &dstcnt, exclude, false)) 1013 return -EHOSTUNREACH; 1014 tipc_dest_pop(&dsts, &node, &port); 1015 cong = tipc_group_cong(tsk->group, node, port, blks, 1016 &mbr); 1017 if (!cong) 1018 break; 1019 if (mbr == first) 1020 break; 1021 if (!first) 1022 first = mbr; 1023 } 1024 1025 /* Start over if destination was not in member list */ 1026 if (unlikely(!mbr)) 1027 continue; 1028 1029 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1030 break; 1031 1032 /* Block or return if destination link or member is congested */ 1033 rc = tipc_wait_for_cond(sock, &timeout, 1034 !tipc_dest_find(cong_links, node, 0) && 1035 tsk->group && 1036 !tipc_group_cong(tsk->group, node, port, 1037 blks, &mbr)); 1038 if (unlikely(rc)) 1039 return rc; 1040 1041 /* Send, unless destination disappeared while waiting */ 1042 if (likely(mbr)) 1043 break; 1044 } 1045 1046 if (unlikely(lookups >= 4)) 1047 return -EHOSTUNREACH; 1048 1049 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1050 1051 return rc ? rc : dlen; 1052} 1053 1054/** 1055 * tipc_send_group_bcast - send message to all members in communication group 1056 * @sock: socket structure 1057 * @m: message to send 1058 * @dlen: total length of message data 1059 * @timeout: timeout to wait for wakeup 1060 * 1061 * Called from function tipc_sendmsg(), which has done all sanity checks 1062 * Returns the number of bytes sent on success, or errno 1063 */ 1064static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1065 int dlen, long timeout) 1066{ 1067 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1068 struct sock *sk = sock->sk; 1069 struct net *net = sock_net(sk); 1070 struct tipc_sock *tsk = tipc_sk(sk); 1071 struct tipc_nlist *dsts; 1072 struct tipc_mc_method *method = &tsk->mc_method; 1073 bool ack = method->mandatory && method->rcast; 1074 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1075 struct tipc_msg *hdr = &tsk->phdr; 1076 int mtu = tipc_bcast_get_mtu(net); 1077 struct sk_buff_head pkts; 1078 int rc = -EHOSTUNREACH; 1079 1080 /* Block or return if any destination link or member is congested */ 1081 rc = tipc_wait_for_cond(sock, &timeout, 1082 !tsk->cong_link_cnt && tsk->group && 1083 !tipc_group_bc_cong(tsk->group, blks)); 1084 if (unlikely(rc)) 1085 return rc; 1086 1087 dsts = tipc_group_dests(tsk->group); 1088 if (!dsts->local && !dsts->remote) 1089 return -EHOSTUNREACH; 1090 1091 /* Complete message header */ 1092 if (dest) { 1093 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1094 msg_set_nameinst(hdr, dest->addr.name.name.instance); 1095 } else { 1096 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1097 msg_set_nameinst(hdr, 0); 1098 } 1099 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1100 msg_set_destport(hdr, 0); 1101 msg_set_destnode(hdr, 0); 1102 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1103 1104 /* Avoid getting stuck with repeated forced replicasts */ 1105 msg_set_grp_bc_ack_req(hdr, ack); 1106 1107 /* Build message as chain of buffers */ 1108 __skb_queue_head_init(&pkts); 1109 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1110 if (unlikely(rc != dlen)) 1111 return rc; 1112 1113 /* Send message */ 1114 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1115 if (unlikely(rc)) 1116 return rc; 1117 1118 /* Update broadcast sequence number and send windows */ 1119 tipc_group_update_bc_members(tsk->group, blks, ack); 1120 1121 /* Broadcast link is now free to choose method for next broadcast */ 1122 method->mandatory = false; 1123 method->expires = jiffies; 1124 1125 return dlen; 1126} 1127 1128/** 1129 * tipc_send_group_mcast - send message to all members with given identity 1130 * @sock: socket structure 1131 * @m: message to send 1132 * @dlen: total length of message data 1133 * @timeout: timeout to wait for wakeup 1134 * 1135 * Called from function tipc_sendmsg(), which has done all sanity checks 1136 * Returns the number of bytes sent on success, or errno 1137 */ 1138static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1139 int dlen, long timeout) 1140{ 1141 struct sock *sk = sock->sk; 1142 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1143 struct tipc_sock *tsk = tipc_sk(sk); 1144 struct tipc_group *grp = tsk->group; 1145 struct tipc_msg *hdr = &tsk->phdr; 1146 struct net *net = sock_net(sk); 1147 u32 type, inst, scope, exclude; 1148 struct list_head dsts; 1149 u32 dstcnt; 1150 1151 INIT_LIST_HEAD(&dsts); 1152 1153 type = msg_nametype(hdr); 1154 inst = dest->addr.name.name.instance; 1155 scope = msg_lookup_scope(hdr); 1156 exclude = tipc_group_exclude(grp); 1157 1158 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 1159 &dstcnt, exclude, true)) 1160 return -EHOSTUNREACH; 1161 1162 if (dstcnt == 1) { 1163 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref); 1164 return tipc_send_group_unicast(sock, m, dlen, timeout); 1165 } 1166 1167 tipc_dest_list_purge(&dsts); 1168 return tipc_send_group_bcast(sock, m, dlen, timeout); 1169} 1170 1171/** 1172 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1173 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1174 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1175 * 1176 * Multi-threaded: parallel calls with reference to same queues may occur 1177 */ 1178void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1179 struct sk_buff_head *inputq) 1180{ 1181 u32 self = tipc_own_addr(net); 1182 u32 type, lower, upper, scope; 1183 struct sk_buff *skb, *_skb; 1184 u32 portid, onode; 1185 struct sk_buff_head tmpq; 1186 struct list_head dports; 1187 struct tipc_msg *hdr; 1188 int user, mtyp, hlen; 1189 bool exact; 1190 1191 __skb_queue_head_init(&tmpq); 1192 INIT_LIST_HEAD(&dports); 1193 1194 skb = tipc_skb_peek(arrvq, &inputq->lock); 1195 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1196 hdr = buf_msg(skb); 1197 user = msg_user(hdr); 1198 mtyp = msg_type(hdr); 1199 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1200 onode = msg_orignode(hdr); 1201 type = msg_nametype(hdr); 1202 1203 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1204 spin_lock_bh(&inputq->lock); 1205 if (skb_peek(arrvq) == skb) { 1206 __skb_dequeue(arrvq); 1207 __skb_queue_tail(inputq, skb); 1208 } 1209 kfree_skb(skb); 1210 spin_unlock_bh(&inputq->lock); 1211 continue; 1212 } 1213 1214 /* Group messages require exact scope match */ 1215 if (msg_in_group(hdr)) { 1216 lower = 0; 1217 upper = ~0; 1218 scope = msg_lookup_scope(hdr); 1219 exact = true; 1220 } else { 1221 /* TIPC_NODE_SCOPE means "any scope" in this context */ 1222 if (onode == self) 1223 scope = TIPC_NODE_SCOPE; 1224 else 1225 scope = TIPC_CLUSTER_SCOPE; 1226 exact = false; 1227 lower = msg_namelower(hdr); 1228 upper = msg_nameupper(hdr); 1229 } 1230 1231 /* Create destination port list: */ 1232 tipc_nametbl_mc_lookup(net, type, lower, upper, 1233 scope, exact, &dports); 1234 1235 /* Clone message per destination */ 1236 while (tipc_dest_pop(&dports, NULL, &portid)) { 1237 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1238 if (_skb) { 1239 msg_set_destport(buf_msg(_skb), portid); 1240 __skb_queue_tail(&tmpq, _skb); 1241 continue; 1242 } 1243 pr_warn("Failed to clone mcast rcv buffer\n"); 1244 } 1245 /* Append to inputq if not already done by other thread */ 1246 spin_lock_bh(&inputq->lock); 1247 if (skb_peek(arrvq) == skb) { 1248 skb_queue_splice_tail_init(&tmpq, inputq); 1249 /* Decrease the skb's refcnt as increasing in the 1250 * function tipc_skb_peek 1251 */ 1252 kfree_skb(__skb_dequeue(arrvq)); 1253 } 1254 spin_unlock_bh(&inputq->lock); 1255 __skb_queue_purge(&tmpq); 1256 kfree_skb(skb); 1257 } 1258 tipc_sk_rcv(net, inputq); 1259} 1260 1261/* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1262 * when socket is in Nagle mode 1263 */ 1264static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1265{ 1266 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1267 struct sk_buff *skb = skb_peek_tail(txq); 1268 struct net *net = sock_net(&tsk->sk); 1269 u32 dnode = tsk_peer_node(tsk); 1270 int rc; 1271 1272 if (nagle_ack) { 1273 tsk->pkt_cnt += skb_queue_len(txq); 1274 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1275 tsk->oneway = 0; 1276 if (tsk->nagle_start < NAGLE_START_MAX) 1277 tsk->nagle_start *= 2; 1278 tsk->expect_ack = false; 1279 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1280 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1281 tsk->nagle_start); 1282 } else { 1283 tsk->nagle_start = NAGLE_START_INIT; 1284 if (skb) { 1285 msg_set_ack_required(buf_msg(skb)); 1286 tsk->expect_ack = true; 1287 } else { 1288 tsk->expect_ack = false; 1289 } 1290 } 1291 tsk->msg_acc = 0; 1292 tsk->pkt_cnt = 0; 1293 } 1294 1295 if (!skb || tsk->cong_link_cnt) 1296 return; 1297 1298 /* Do not send SYN again after congestion */ 1299 if (msg_is_syn(buf_msg(skb))) 1300 return; 1301 1302 if (tsk->msg_acc) 1303 tsk->pkt_cnt += skb_queue_len(txq); 1304 tsk->snt_unacked += tsk->snd_backlog; 1305 tsk->snd_backlog = 0; 1306 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1307 if (rc == -ELINKCONG) 1308 tsk->cong_link_cnt = 1; 1309} 1310 1311/** 1312 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1313 * @tsk: receiving socket 1314 * @skb: pointer to message buffer. 1315 */ 1316static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1317 struct sk_buff_head *inputq, 1318 struct sk_buff_head *xmitq) 1319{ 1320 struct tipc_msg *hdr = buf_msg(skb); 1321 u32 onode = tsk_own_node(tsk); 1322 struct sock *sk = &tsk->sk; 1323 int mtyp = msg_type(hdr); 1324 bool was_cong; 1325 1326 /* Ignore if connection cannot be validated: */ 1327 if (!tsk_peer_msg(tsk, hdr)) { 1328 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1329 goto exit; 1330 } 1331 1332 if (unlikely(msg_errcode(hdr))) { 1333 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1334 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1335 tsk_peer_port(tsk)); 1336 sk->sk_state_change(sk); 1337 1338 /* State change is ignored if socket already awake, 1339 * - convert msg to abort msg and add to inqueue 1340 */ 1341 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1342 msg_set_type(hdr, TIPC_CONN_MSG); 1343 msg_set_size(hdr, BASIC_H_SIZE); 1344 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1345 __skb_queue_tail(inputq, skb); 1346 return; 1347 } 1348 1349 tsk->probe_unacked = false; 1350 1351 if (mtyp == CONN_PROBE) { 1352 msg_set_type(hdr, CONN_PROBE_REPLY); 1353 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1354 __skb_queue_tail(xmitq, skb); 1355 return; 1356 } else if (mtyp == CONN_ACK) { 1357 was_cong = tsk_conn_cong(tsk); 1358 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1359 tsk->snt_unacked -= msg_conn_ack(hdr); 1360 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1361 tsk->snd_win = msg_adv_win(hdr); 1362 if (was_cong && !tsk_conn_cong(tsk)) 1363 sk->sk_write_space(sk); 1364 } else if (mtyp != CONN_PROBE_REPLY) { 1365 pr_warn("Received unknown CONN_PROTO msg\n"); 1366 } 1367exit: 1368 kfree_skb(skb); 1369} 1370 1371/** 1372 * tipc_sendmsg - send message in connectionless manner 1373 * @sock: socket structure 1374 * @m: message to send 1375 * @dsz: amount of user data to be sent 1376 * 1377 * Message must have an destination specified explicitly. 1378 * Used for SOCK_RDM and SOCK_DGRAM messages, 1379 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1380 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1381 * 1382 * Returns the number of bytes sent on success, or errno otherwise 1383 */ 1384static int tipc_sendmsg(struct socket *sock, 1385 struct msghdr *m, size_t dsz) 1386{ 1387 struct sock *sk = sock->sk; 1388 int ret; 1389 1390 lock_sock(sk); 1391 ret = __tipc_sendmsg(sock, m, dsz); 1392 release_sock(sk); 1393 1394 return ret; 1395} 1396 1397static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1398{ 1399 struct sock *sk = sock->sk; 1400 struct net *net = sock_net(sk); 1401 struct tipc_sock *tsk = tipc_sk(sk); 1402 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1403 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1404 struct list_head *clinks = &tsk->cong_links; 1405 bool syn = !tipc_sk_type_connectionless(sk); 1406 struct tipc_group *grp = tsk->group; 1407 struct tipc_msg *hdr = &tsk->phdr; 1408 struct tipc_name_seq *seq; 1409 struct sk_buff_head pkts; 1410 u32 dport = 0, dnode = 0; 1411 u32 type = 0, inst = 0; 1412 int mtu, rc; 1413 1414 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1415 return -EMSGSIZE; 1416 1417 if (likely(dest)) { 1418 if (unlikely(m->msg_namelen < sizeof(*dest))) 1419 return -EINVAL; 1420 if (unlikely(dest->family != AF_TIPC)) 1421 return -EINVAL; 1422 } 1423 1424 if (grp) { 1425 if (!dest) 1426 return tipc_send_group_bcast(sock, m, dlen, timeout); 1427 if (dest->addrtype == TIPC_ADDR_NAME) 1428 return tipc_send_group_anycast(sock, m, dlen, timeout); 1429 if (dest->addrtype == TIPC_ADDR_ID) 1430 return tipc_send_group_unicast(sock, m, dlen, timeout); 1431 if (dest->addrtype == TIPC_ADDR_MCAST) 1432 return tipc_send_group_mcast(sock, m, dlen, timeout); 1433 return -EINVAL; 1434 } 1435 1436 if (unlikely(!dest)) { 1437 dest = &tsk->peer; 1438 if (!syn && dest->family != AF_TIPC) 1439 return -EDESTADDRREQ; 1440 } 1441 1442 if (unlikely(syn)) { 1443 if (sk->sk_state == TIPC_LISTEN) 1444 return -EPIPE; 1445 if (sk->sk_state != TIPC_OPEN) 1446 return -EISCONN; 1447 if (tsk->published) 1448 return -EOPNOTSUPP; 1449 if (dest->addrtype == TIPC_ADDR_NAME) { 1450 tsk->conn_type = dest->addr.name.name.type; 1451 tsk->conn_instance = dest->addr.name.name.instance; 1452 } 1453 msg_set_syn(hdr, 1); 1454 } 1455 1456 seq = &dest->addr.nameseq; 1457 if (dest->addrtype == TIPC_ADDR_MCAST) 1458 return tipc_sendmcast(sock, seq, m, dlen, timeout); 1459 1460 if (dest->addrtype == TIPC_ADDR_NAME) { 1461 type = dest->addr.name.name.type; 1462 inst = dest->addr.name.name.instance; 1463 dnode = dest->addr.name.domain; 1464 dport = tipc_nametbl_translate(net, type, inst, &dnode); 1465 if (unlikely(!dport && !dnode)) 1466 return -EHOSTUNREACH; 1467 } else if (dest->addrtype == TIPC_ADDR_ID) { 1468 dnode = dest->addr.id.node; 1469 } else { 1470 return -EINVAL; 1471 } 1472 1473 /* Block or return if destination link is congested */ 1474 rc = tipc_wait_for_cond(sock, &timeout, 1475 !tipc_dest_find(clinks, dnode, 0)); 1476 if (unlikely(rc)) 1477 return rc; 1478 1479 if (dest->addrtype == TIPC_ADDR_NAME) { 1480 msg_set_type(hdr, TIPC_NAMED_MSG); 1481 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1482 msg_set_nametype(hdr, type); 1483 msg_set_nameinst(hdr, inst); 1484 msg_set_lookup_scope(hdr, tipc_node2scope(dnode)); 1485 msg_set_destnode(hdr, dnode); 1486 msg_set_destport(hdr, dport); 1487 } else { /* TIPC_ADDR_ID */ 1488 msg_set_type(hdr, TIPC_DIRECT_MSG); 1489 msg_set_lookup_scope(hdr, 0); 1490 msg_set_destnode(hdr, dnode); 1491 msg_set_destport(hdr, dest->addr.id.ref); 1492 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1493 } 1494 1495 __skb_queue_head_init(&pkts); 1496 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, true); 1497 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1498 if (unlikely(rc != dlen)) 1499 return rc; 1500 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1501 __skb_queue_purge(&pkts); 1502 return -ENOMEM; 1503 } 1504 1505 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1506 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 1507 if (unlikely(rc == -ELINKCONG)) { 1508 tipc_dest_push(clinks, dnode, 0); 1509 tsk->cong_link_cnt++; 1510 rc = 0; 1511 } 1512 1513 if (unlikely(syn && !rc)) { 1514 tipc_set_sk_state(sk, TIPC_CONNECTING); 1515 if (dlen && timeout) { 1516 timeout = msecs_to_jiffies(timeout); 1517 tipc_wait_for_connect(sock, &timeout); 1518 } 1519 } 1520 1521 return rc ? rc : dlen; 1522} 1523 1524/** 1525 * tipc_sendstream - send stream-oriented data 1526 * @sock: socket structure 1527 * @m: data to send 1528 * @dsz: total length of data to be transmitted 1529 * 1530 * Used for SOCK_STREAM data. 1531 * 1532 * Returns the number of bytes sent on success (or partial success), 1533 * or errno if no data sent 1534 */ 1535static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1536{ 1537 struct sock *sk = sock->sk; 1538 int ret; 1539 1540 lock_sock(sk); 1541 ret = __tipc_sendstream(sock, m, dsz); 1542 release_sock(sk); 1543 1544 return ret; 1545} 1546 1547static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1548{ 1549 struct sock *sk = sock->sk; 1550 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1551 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1552 struct sk_buff_head *txq = &sk->sk_write_queue; 1553 struct tipc_sock *tsk = tipc_sk(sk); 1554 struct tipc_msg *hdr = &tsk->phdr; 1555 struct net *net = sock_net(sk); 1556 struct sk_buff *skb; 1557 u32 dnode = tsk_peer_node(tsk); 1558 int maxnagle = tsk->maxnagle; 1559 int maxpkt = tsk->max_pkt; 1560 int send, sent = 0; 1561 int blocks, rc = 0; 1562 1563 if (unlikely(dlen > INT_MAX)) 1564 return -EMSGSIZE; 1565 1566 /* Handle implicit connection setup */ 1567 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) { 1568 rc = __tipc_sendmsg(sock, m, dlen); 1569 if (dlen && dlen == rc) { 1570 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1571 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1572 } 1573 return rc; 1574 } 1575 1576 do { 1577 rc = tipc_wait_for_cond(sock, &timeout, 1578 (!tsk->cong_link_cnt && 1579 !tsk_conn_cong(tsk) && 1580 tipc_sk_connected(sk))); 1581 if (unlikely(rc)) 1582 break; 1583 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1584 blocks = tsk->snd_backlog; 1585 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1586 send <= maxnagle) { 1587 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1588 if (unlikely(rc < 0)) 1589 break; 1590 blocks += rc; 1591 tsk->msg_acc++; 1592 if (blocks <= 64 && tsk->expect_ack) { 1593 tsk->snd_backlog = blocks; 1594 sent += send; 1595 break; 1596 } else if (blocks > 64) { 1597 tsk->pkt_cnt += skb_queue_len(txq); 1598 } else { 1599 skb = skb_peek_tail(txq); 1600 if (skb) { 1601 msg_set_ack_required(buf_msg(skb)); 1602 tsk->expect_ack = true; 1603 } else { 1604 tsk->expect_ack = false; 1605 } 1606 tsk->msg_acc = 0; 1607 tsk->pkt_cnt = 0; 1608 } 1609 } else { 1610 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1611 if (unlikely(rc != send)) 1612 break; 1613 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1614 } 1615 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1616 TIPC_DUMP_SK_SNDQ, " "); 1617 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1618 if (unlikely(rc == -ELINKCONG)) { 1619 tsk->cong_link_cnt = 1; 1620 rc = 0; 1621 } 1622 if (likely(!rc)) { 1623 tsk->snt_unacked += blocks; 1624 tsk->snd_backlog = 0; 1625 sent += send; 1626 } 1627 } while (sent < dlen && !rc); 1628 1629 return sent ? sent : rc; 1630} 1631 1632/** 1633 * tipc_send_packet - send a connection-oriented message 1634 * @sock: socket structure 1635 * @m: message to send 1636 * @dsz: length of data to be transmitted 1637 * 1638 * Used for SOCK_SEQPACKET messages. 1639 * 1640 * Returns the number of bytes sent on success, or errno otherwise 1641 */ 1642static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1643{ 1644 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1645 return -EMSGSIZE; 1646 1647 return tipc_sendstream(sock, m, dsz); 1648} 1649 1650/* tipc_sk_finish_conn - complete the setup of a connection 1651 */ 1652static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1653 u32 peer_node) 1654{ 1655 struct sock *sk = &tsk->sk; 1656 struct net *net = sock_net(sk); 1657 struct tipc_msg *msg = &tsk->phdr; 1658 1659 msg_set_syn(msg, 0); 1660 msg_set_destnode(msg, peer_node); 1661 msg_set_destport(msg, peer_port); 1662 msg_set_type(msg, TIPC_CONN_MSG); 1663 msg_set_lookup_scope(msg, 0); 1664 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1665 1666 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1667 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1668 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1669 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1670 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1671 tsk_set_nagle(tsk); 1672 __skb_queue_purge(&sk->sk_write_queue); 1673 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1674 return; 1675 1676 /* Fall back to message based flow control */ 1677 tsk->rcv_win = FLOWCTL_MSG_WIN; 1678 tsk->snd_win = FLOWCTL_MSG_WIN; 1679} 1680 1681/** 1682 * tipc_sk_set_orig_addr - capture sender's address for received message 1683 * @m: descriptor for message info 1684 * @skb: received message 1685 * 1686 * Note: Address is not captured if not requested by receiver. 1687 */ 1688static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1689{ 1690 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1691 struct tipc_msg *hdr = buf_msg(skb); 1692 1693 if (!srcaddr) 1694 return; 1695 1696 srcaddr->sock.family = AF_TIPC; 1697 srcaddr->sock.addrtype = TIPC_ADDR_ID; 1698 srcaddr->sock.scope = 0; 1699 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1700 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1701 srcaddr->sock.addr.name.domain = 0; 1702 m->msg_namelen = sizeof(struct sockaddr_tipc); 1703 1704 if (!msg_in_group(hdr)) 1705 return; 1706 1707 /* Group message users may also want to know sending member's id */ 1708 srcaddr->member.family = AF_TIPC; 1709 srcaddr->member.addrtype = TIPC_ADDR_NAME; 1710 srcaddr->member.scope = 0; 1711 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1712 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1713 srcaddr->member.addr.name.domain = 0; 1714 m->msg_namelen = sizeof(*srcaddr); 1715} 1716 1717/** 1718 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1719 * @m: descriptor for message info 1720 * @skb: received message buffer 1721 * @tsk: TIPC port associated with message 1722 * 1723 * Note: Ancillary data is not captured if not requested by receiver. 1724 * 1725 * Returns 0 if successful, otherwise errno 1726 */ 1727static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1728 struct tipc_sock *tsk) 1729{ 1730 struct tipc_msg *msg; 1731 u32 anc_data[3]; 1732 u32 err; 1733 u32 dest_type; 1734 int has_name; 1735 int res; 1736 1737 if (likely(m->msg_controllen == 0)) 1738 return 0; 1739 msg = buf_msg(skb); 1740 1741 /* Optionally capture errored message object(s) */ 1742 err = msg ? msg_errcode(msg) : 0; 1743 if (unlikely(err)) { 1744 anc_data[0] = err; 1745 anc_data[1] = msg_data_sz(msg); 1746 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); 1747 if (res) 1748 return res; 1749 if (anc_data[1]) { 1750 if (skb_linearize(skb)) 1751 return -ENOMEM; 1752 msg = buf_msg(skb); 1753 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], 1754 msg_data(msg)); 1755 if (res) 1756 return res; 1757 } 1758 } 1759 1760 /* Optionally capture message destination object */ 1761 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 1762 switch (dest_type) { 1763 case TIPC_NAMED_MSG: 1764 has_name = 1; 1765 anc_data[0] = msg_nametype(msg); 1766 anc_data[1] = msg_namelower(msg); 1767 anc_data[2] = msg_namelower(msg); 1768 break; 1769 case TIPC_MCAST_MSG: 1770 has_name = 1; 1771 anc_data[0] = msg_nametype(msg); 1772 anc_data[1] = msg_namelower(msg); 1773 anc_data[2] = msg_nameupper(msg); 1774 break; 1775 case TIPC_CONN_MSG: 1776 has_name = (tsk->conn_type != 0); 1777 anc_data[0] = tsk->conn_type; 1778 anc_data[1] = tsk->conn_instance; 1779 anc_data[2] = tsk->conn_instance; 1780 break; 1781 default: 1782 has_name = 0; 1783 } 1784 if (has_name) { 1785 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); 1786 if (res) 1787 return res; 1788 } 1789 1790 return 0; 1791} 1792 1793static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1794{ 1795 struct sock *sk = &tsk->sk; 1796 struct sk_buff *skb = NULL; 1797 struct tipc_msg *msg; 1798 u32 peer_port = tsk_peer_port(tsk); 1799 u32 dnode = tsk_peer_node(tsk); 1800 1801 if (!tipc_sk_connected(sk)) 1802 return NULL; 1803 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1804 dnode, tsk_own_node(tsk), peer_port, 1805 tsk->portid, TIPC_OK); 1806 if (!skb) 1807 return NULL; 1808 msg = buf_msg(skb); 1809 msg_set_conn_ack(msg, tsk->rcv_unacked); 1810 tsk->rcv_unacked = 0; 1811 1812 /* Adjust to and advertize the correct window limit */ 1813 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1814 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1815 msg_set_adv_win(msg, tsk->rcv_win); 1816 } 1817 return skb; 1818} 1819 1820static void tipc_sk_send_ack(struct tipc_sock *tsk) 1821{ 1822 struct sk_buff *skb; 1823 1824 skb = tipc_sk_build_ack(tsk); 1825 if (!skb) 1826 return; 1827 1828 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1829 msg_link_selector(buf_msg(skb))); 1830} 1831 1832static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1833{ 1834 struct sock *sk = sock->sk; 1835 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1836 long timeo = *timeop; 1837 int err = sock_error(sk); 1838 1839 if (err) 1840 return err; 1841 1842 for (;;) { 1843 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1844 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1845 err = -ENOTCONN; 1846 break; 1847 } 1848 add_wait_queue(sk_sleep(sk), &wait); 1849 release_sock(sk); 1850 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1851 sched_annotate_sleep(); 1852 lock_sock(sk); 1853 remove_wait_queue(sk_sleep(sk), &wait); 1854 } 1855 err = 0; 1856 if (!skb_queue_empty(&sk->sk_receive_queue)) 1857 break; 1858 err = -EAGAIN; 1859 if (!timeo) 1860 break; 1861 err = sock_intr_errno(timeo); 1862 if (signal_pending(current)) 1863 break; 1864 1865 err = sock_error(sk); 1866 if (err) 1867 break; 1868 } 1869 *timeop = timeo; 1870 return err; 1871} 1872 1873/** 1874 * tipc_recvmsg - receive packet-oriented message 1875 * @m: descriptor for message info 1876 * @buflen: length of user buffer area 1877 * @flags: receive flags 1878 * 1879 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1880 * If the complete message doesn't fit in user area, truncate it. 1881 * 1882 * Returns size of returned message data, errno otherwise 1883 */ 1884static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1885 size_t buflen, int flags) 1886{ 1887 struct sock *sk = sock->sk; 1888 bool connected = !tipc_sk_type_connectionless(sk); 1889 struct tipc_sock *tsk = tipc_sk(sk); 1890 int rc, err, hlen, dlen, copy; 1891 struct tipc_skb_cb *skb_cb; 1892 struct sk_buff_head xmitq; 1893 struct tipc_msg *hdr; 1894 struct sk_buff *skb; 1895 bool grp_evt; 1896 long timeout; 1897 1898 /* Catch invalid receive requests */ 1899 if (unlikely(!buflen)) 1900 return -EINVAL; 1901 1902 lock_sock(sk); 1903 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1904 rc = -ENOTCONN; 1905 goto exit; 1906 } 1907 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1908 1909 /* Step rcv queue to first msg with data or error; wait if necessary */ 1910 do { 1911 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1912 if (unlikely(rc)) 1913 goto exit; 1914 skb = skb_peek(&sk->sk_receive_queue); 1915 skb_cb = TIPC_SKB_CB(skb); 1916 hdr = buf_msg(skb); 1917 dlen = msg_data_sz(hdr); 1918 hlen = msg_hdr_sz(hdr); 1919 err = msg_errcode(hdr); 1920 grp_evt = msg_is_grp_evt(hdr); 1921 if (likely(dlen || err)) 1922 break; 1923 tsk_advance_rx_queue(sk); 1924 } while (1); 1925 1926 /* Collect msg meta data, including error code and rejected data */ 1927 tipc_sk_set_orig_addr(m, skb); 1928 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1929 if (unlikely(rc)) 1930 goto exit; 1931 hdr = buf_msg(skb); 1932 1933 /* Capture data if non-error msg, otherwise just set return value */ 1934 if (likely(!err)) { 1935 int offset = skb_cb->bytes_read; 1936 1937 copy = min_t(int, dlen - offset, buflen); 1938 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 1939 if (unlikely(rc)) 1940 goto exit; 1941 if (unlikely(offset + copy < dlen)) { 1942 if (flags & MSG_EOR) { 1943 if (!(flags & MSG_PEEK)) 1944 skb_cb->bytes_read = offset + copy; 1945 } else { 1946 m->msg_flags |= MSG_TRUNC; 1947 skb_cb->bytes_read = 0; 1948 } 1949 } else { 1950 if (flags & MSG_EOR) 1951 m->msg_flags |= MSG_EOR; 1952 skb_cb->bytes_read = 0; 1953 } 1954 } else { 1955 copy = 0; 1956 rc = 0; 1957 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) { 1958 rc = -ECONNRESET; 1959 goto exit; 1960 } 1961 } 1962 1963 /* Mark message as group event if applicable */ 1964 if (unlikely(grp_evt)) { 1965 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1966 m->msg_flags |= MSG_EOR; 1967 m->msg_flags |= MSG_OOB; 1968 copy = 0; 1969 } 1970 1971 /* Caption of data or error code/rejected data was successful */ 1972 if (unlikely(flags & MSG_PEEK)) 1973 goto exit; 1974 1975 /* Send group flow control advertisement when applicable */ 1976 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1977 __skb_queue_head_init(&xmitq); 1978 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1979 msg_orignode(hdr), msg_origport(hdr), 1980 &xmitq); 1981 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1982 } 1983 1984 if (skb_cb->bytes_read) 1985 goto exit; 1986 1987 tsk_advance_rx_queue(sk); 1988 1989 if (likely(!connected)) 1990 goto exit; 1991 1992 /* Send connection flow control advertisement when applicable */ 1993 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1994 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1995 tipc_sk_send_ack(tsk); 1996exit: 1997 release_sock(sk); 1998 return rc ? rc : copy; 1999} 2000 2001/** 2002 * tipc_recvstream - receive stream-oriented data 2003 * @m: descriptor for message info 2004 * @buflen: total size of user buffer area 2005 * @flags: receive flags 2006 * 2007 * Used for SOCK_STREAM messages only. If not enough data is available 2008 * will optionally wait for more; never truncates data. 2009 * 2010 * Returns size of returned message data, errno otherwise 2011 */ 2012static int tipc_recvstream(struct socket *sock, struct msghdr *m, 2013 size_t buflen, int flags) 2014{ 2015 struct sock *sk = sock->sk; 2016 struct tipc_sock *tsk = tipc_sk(sk); 2017 struct sk_buff *skb; 2018 struct tipc_msg *hdr; 2019 struct tipc_skb_cb *skb_cb; 2020 bool peek = flags & MSG_PEEK; 2021 int offset, required, copy, copied = 0; 2022 int hlen, dlen, err, rc; 2023 long timeout; 2024 2025 /* Catch invalid receive attempts */ 2026 if (unlikely(!buflen)) 2027 return -EINVAL; 2028 2029 lock_sock(sk); 2030 2031 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2032 rc = -ENOTCONN; 2033 goto exit; 2034 } 2035 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2036 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2037 2038 do { 2039 /* Look at first msg in receive queue; wait if necessary */ 2040 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2041 if (unlikely(rc)) 2042 break; 2043 skb = skb_peek(&sk->sk_receive_queue); 2044 skb_cb = TIPC_SKB_CB(skb); 2045 hdr = buf_msg(skb); 2046 dlen = msg_data_sz(hdr); 2047 hlen = msg_hdr_sz(hdr); 2048 err = msg_errcode(hdr); 2049 2050 /* Discard any empty non-errored (SYN-) message */ 2051 if (unlikely(!dlen && !err)) { 2052 tsk_advance_rx_queue(sk); 2053 continue; 2054 } 2055 2056 /* Collect msg meta data, incl. error code and rejected data */ 2057 if (!copied) { 2058 tipc_sk_set_orig_addr(m, skb); 2059 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2060 if (rc) 2061 break; 2062 hdr = buf_msg(skb); 2063 } 2064 2065 /* Copy data if msg ok, otherwise return error/partial data */ 2066 if (likely(!err)) { 2067 offset = skb_cb->bytes_read; 2068 copy = min_t(int, dlen - offset, buflen - copied); 2069 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2070 if (unlikely(rc)) 2071 break; 2072 copied += copy; 2073 offset += copy; 2074 if (unlikely(offset < dlen)) { 2075 if (!peek) 2076 skb_cb->bytes_read = offset; 2077 break; 2078 } 2079 } else { 2080 rc = 0; 2081 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2082 rc = -ECONNRESET; 2083 if (copied || rc) 2084 break; 2085 } 2086 2087 if (unlikely(peek)) 2088 break; 2089 2090 tsk_advance_rx_queue(sk); 2091 2092 /* Send connection flow control advertisement when applicable */ 2093 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2094 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2095 tipc_sk_send_ack(tsk); 2096 2097 /* Exit if all requested data or FIN/error received */ 2098 if (copied == buflen || err) 2099 break; 2100 2101 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2102exit: 2103 release_sock(sk); 2104 return copied ? copied : rc; 2105} 2106 2107/** 2108 * tipc_write_space - wake up thread if port congestion is released 2109 * @sk: socket 2110 */ 2111static void tipc_write_space(struct sock *sk) 2112{ 2113 struct socket_wq *wq; 2114 2115 rcu_read_lock(); 2116 wq = rcu_dereference(sk->sk_wq); 2117 if (skwq_has_sleeper(wq)) 2118 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2119 EPOLLWRNORM | EPOLLWRBAND); 2120 rcu_read_unlock(); 2121} 2122 2123/** 2124 * tipc_data_ready - wake up threads to indicate messages have been received 2125 * @sk: socket 2126 */ 2127static void tipc_data_ready(struct sock *sk) 2128{ 2129 struct socket_wq *wq; 2130 2131 rcu_read_lock(); 2132 wq = rcu_dereference(sk->sk_wq); 2133 if (skwq_has_sleeper(wq)) 2134 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2135 EPOLLRDNORM | EPOLLRDBAND); 2136 rcu_read_unlock(); 2137} 2138 2139static void tipc_sock_destruct(struct sock *sk) 2140{ 2141 __skb_queue_purge(&sk->sk_receive_queue); 2142} 2143 2144static void tipc_sk_proto_rcv(struct sock *sk, 2145 struct sk_buff_head *inputq, 2146 struct sk_buff_head *xmitq) 2147{ 2148 struct sk_buff *skb = __skb_dequeue(inputq); 2149 struct tipc_sock *tsk = tipc_sk(sk); 2150 struct tipc_msg *hdr = buf_msg(skb); 2151 struct tipc_group *grp = tsk->group; 2152 bool wakeup = false; 2153 2154 switch (msg_user(hdr)) { 2155 case CONN_MANAGER: 2156 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2157 return; 2158 case SOCK_WAKEUP: 2159 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2160 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2161 smp_wmb(); 2162 tsk->cong_link_cnt--; 2163 wakeup = true; 2164 tipc_sk_push_backlog(tsk, false); 2165 break; 2166 case GROUP_PROTOCOL: 2167 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2168 break; 2169 case TOP_SRV: 2170 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2171 hdr, inputq, xmitq); 2172 break; 2173 default: 2174 break; 2175 } 2176 2177 if (wakeup) 2178 sk->sk_write_space(sk); 2179 2180 kfree_skb(skb); 2181} 2182 2183/** 2184 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2185 * @tsk: TIPC socket 2186 * @skb: pointer to message buffer. 2187 * @xmitq: for Nagle ACK if any 2188 * Returns true if message should be added to receive queue, false otherwise 2189 */ 2190static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2191 struct sk_buff_head *xmitq) 2192{ 2193 struct sock *sk = &tsk->sk; 2194 struct net *net = sock_net(sk); 2195 struct tipc_msg *hdr = buf_msg(skb); 2196 bool con_msg = msg_connected(hdr); 2197 u32 pport = tsk_peer_port(tsk); 2198 u32 pnode = tsk_peer_node(tsk); 2199 u32 oport = msg_origport(hdr); 2200 u32 onode = msg_orignode(hdr); 2201 int err = msg_errcode(hdr); 2202 unsigned long delay; 2203 2204 if (unlikely(msg_mcast(hdr))) 2205 return false; 2206 tsk->oneway = 0; 2207 2208 switch (sk->sk_state) { 2209 case TIPC_CONNECTING: 2210 /* Setup ACK */ 2211 if (likely(con_msg)) { 2212 if (err) 2213 break; 2214 tipc_sk_finish_conn(tsk, oport, onode); 2215 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2216 /* ACK+ message with data is added to receive queue */ 2217 if (msg_data_sz(hdr)) 2218 return true; 2219 /* Empty ACK-, - wake up sleeping connect() and drop */ 2220 sk->sk_state_change(sk); 2221 msg_set_dest_droppable(hdr, 1); 2222 return false; 2223 } 2224 /* Ignore connectionless message if not from listening socket */ 2225 if (oport != pport || onode != pnode) 2226 return false; 2227 2228 /* Rejected SYN */ 2229 if (err != TIPC_ERR_OVERLOAD) 2230 break; 2231 2232 /* Prepare for new setup attempt if we have a SYN clone */ 2233 if (skb_queue_empty(&sk->sk_write_queue)) 2234 break; 2235 get_random_bytes(&delay, 2); 2236 delay %= (tsk->conn_timeout / 4); 2237 delay = msecs_to_jiffies(delay + 100); 2238 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2239 return false; 2240 case TIPC_OPEN: 2241 case TIPC_DISCONNECTING: 2242 return false; 2243 case TIPC_LISTEN: 2244 /* Accept only SYN message */ 2245 if (!msg_is_syn(hdr) && 2246 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2247 return false; 2248 if (!con_msg && !err) 2249 return true; 2250 return false; 2251 case TIPC_ESTABLISHED: 2252 if (!skb_queue_empty(&sk->sk_write_queue)) 2253 tipc_sk_push_backlog(tsk, false); 2254 /* Accept only connection-based messages sent by peer */ 2255 if (likely(con_msg && !err && pport == oport && 2256 pnode == onode)) { 2257 if (msg_ack_required(hdr)) { 2258 struct sk_buff *skb; 2259 2260 skb = tipc_sk_build_ack(tsk); 2261 if (skb) { 2262 msg_set_nagle_ack(buf_msg(skb)); 2263 __skb_queue_tail(xmitq, skb); 2264 } 2265 } 2266 return true; 2267 } 2268 if (!tsk_peer_msg(tsk, hdr)) 2269 return false; 2270 if (!err) 2271 return true; 2272 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2273 tipc_node_remove_conn(net, pnode, tsk->portid); 2274 sk->sk_state_change(sk); 2275 return true; 2276 default: 2277 pr_err("Unknown sk_state %u\n", sk->sk_state); 2278 } 2279 /* Abort connection setup attempt */ 2280 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2281 sk->sk_err = ECONNREFUSED; 2282 sk->sk_state_change(sk); 2283 return true; 2284} 2285 2286/** 2287 * rcvbuf_limit - get proper overload limit of socket receive queue 2288 * @sk: socket 2289 * @skb: message 2290 * 2291 * For connection oriented messages, irrespective of importance, 2292 * default queue limit is 2 MB. 2293 * 2294 * For connectionless messages, queue limits are based on message 2295 * importance as follows: 2296 * 2297 * TIPC_LOW_IMPORTANCE (2 MB) 2298 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2299 * TIPC_HIGH_IMPORTANCE (8 MB) 2300 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2301 * 2302 * Returns overload limit according to corresponding message importance 2303 */ 2304static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2305{ 2306 struct tipc_sock *tsk = tipc_sk(sk); 2307 struct tipc_msg *hdr = buf_msg(skb); 2308 2309 if (unlikely(msg_in_group(hdr))) 2310 return READ_ONCE(sk->sk_rcvbuf); 2311 2312 if (unlikely(!msg_connected(hdr))) 2313 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2314 2315 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2316 return READ_ONCE(sk->sk_rcvbuf); 2317 2318 return FLOWCTL_MSG_LIM; 2319} 2320 2321/** 2322 * tipc_sk_filter_rcv - validate incoming message 2323 * @sk: socket 2324 * @skb: pointer to message. 2325 * 2326 * Enqueues message on receive queue if acceptable; optionally handles 2327 * disconnect indication for a connected socket. 2328 * 2329 * Called with socket lock already taken 2330 * 2331 */ 2332static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2333 struct sk_buff_head *xmitq) 2334{ 2335 bool sk_conn = !tipc_sk_type_connectionless(sk); 2336 struct tipc_sock *tsk = tipc_sk(sk); 2337 struct tipc_group *grp = tsk->group; 2338 struct tipc_msg *hdr = buf_msg(skb); 2339 struct net *net = sock_net(sk); 2340 struct sk_buff_head inputq; 2341 int mtyp = msg_type(hdr); 2342 int limit, err = TIPC_OK; 2343 2344 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2345 TIPC_SKB_CB(skb)->bytes_read = 0; 2346 __skb_queue_head_init(&inputq); 2347 __skb_queue_tail(&inputq, skb); 2348 2349 if (unlikely(!msg_isdata(hdr))) 2350 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2351 2352 if (unlikely(grp)) 2353 tipc_group_filter_msg(grp, &inputq, xmitq); 2354 2355 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2356 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2357 2358 /* Validate and add to receive buffer if there is space */ 2359 while ((skb = __skb_dequeue(&inputq))) { 2360 hdr = buf_msg(skb); 2361 limit = rcvbuf_limit(sk, skb); 2362 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2363 (!sk_conn && msg_connected(hdr)) || 2364 (!grp && msg_in_group(hdr))) 2365 err = TIPC_ERR_NO_PORT; 2366 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2367 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2368 "err_overload2!"); 2369 atomic_inc(&sk->sk_drops); 2370 err = TIPC_ERR_OVERLOAD; 2371 } 2372 2373 if (unlikely(err)) { 2374 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2375 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2376 "@filter_rcv!"); 2377 __skb_queue_tail(xmitq, skb); 2378 } 2379 err = TIPC_OK; 2380 continue; 2381 } 2382 __skb_queue_tail(&sk->sk_receive_queue, skb); 2383 skb_set_owner_r(skb, sk); 2384 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2385 "rcvq >90% allocated!"); 2386 sk->sk_data_ready(sk); 2387 } 2388} 2389 2390/** 2391 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2392 * @sk: socket 2393 * @skb: message 2394 * 2395 * Caller must hold socket lock 2396 */ 2397static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2398{ 2399 unsigned int before = sk_rmem_alloc_get(sk); 2400 struct sk_buff_head xmitq; 2401 unsigned int added; 2402 2403 __skb_queue_head_init(&xmitq); 2404 2405 tipc_sk_filter_rcv(sk, skb, &xmitq); 2406 added = sk_rmem_alloc_get(sk) - before; 2407 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2408 2409 /* Send pending response/rejected messages, if any */ 2410 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2411 return 0; 2412} 2413 2414/** 2415 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2416 * inputq and try adding them to socket or backlog queue 2417 * @inputq: list of incoming buffers with potentially different destinations 2418 * @sk: socket where the buffers should be enqueued 2419 * @dport: port number for the socket 2420 * 2421 * Caller must hold socket lock 2422 */ 2423static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2424 u32 dport, struct sk_buff_head *xmitq) 2425{ 2426 unsigned long time_limit = jiffies + usecs_to_jiffies(20000); 2427 struct sk_buff *skb; 2428 unsigned int lim; 2429 atomic_t *dcnt; 2430 u32 onode; 2431 2432 while (skb_queue_len(inputq)) { 2433 if (unlikely(time_after_eq(jiffies, time_limit))) 2434 return; 2435 2436 skb = tipc_skb_dequeue(inputq, dport); 2437 if (unlikely(!skb)) 2438 return; 2439 2440 /* Add message directly to receive queue if possible */ 2441 if (!sock_owned_by_user(sk)) { 2442 tipc_sk_filter_rcv(sk, skb, xmitq); 2443 continue; 2444 } 2445 2446 /* Try backlog, compensating for double-counted bytes */ 2447 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2448 if (!sk->sk_backlog.len) 2449 atomic_set(dcnt, 0); 2450 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2451 if (likely(!sk_add_backlog(sk, skb, lim))) { 2452 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2453 "bklg & rcvq >90% allocated!"); 2454 continue; 2455 } 2456 2457 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2458 /* Overload => reject message back to sender */ 2459 onode = tipc_own_addr(sock_net(sk)); 2460 atomic_inc(&sk->sk_drops); 2461 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2462 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2463 "@sk_enqueue!"); 2464 __skb_queue_tail(xmitq, skb); 2465 } 2466 break; 2467 } 2468} 2469 2470/** 2471 * tipc_sk_rcv - handle a chain of incoming buffers 2472 * @inputq: buffer list containing the buffers 2473 * Consumes all buffers in list until inputq is empty 2474 * Note: may be called in multiple threads referring to the same queue 2475 */ 2476void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2477{ 2478 struct sk_buff_head xmitq; 2479 u32 dnode, dport = 0; 2480 int err; 2481 struct tipc_sock *tsk; 2482 struct sock *sk; 2483 struct sk_buff *skb; 2484 2485 __skb_queue_head_init(&xmitq); 2486 while (skb_queue_len(inputq)) { 2487 dport = tipc_skb_peek_port(inputq, dport); 2488 tsk = tipc_sk_lookup(net, dport); 2489 2490 if (likely(tsk)) { 2491 sk = &tsk->sk; 2492 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2493 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2494 spin_unlock_bh(&sk->sk_lock.slock); 2495 } 2496 /* Send pending response/rejected messages, if any */ 2497 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2498 sock_put(sk); 2499 continue; 2500 } 2501 /* No destination socket => dequeue skb if still there */ 2502 skb = tipc_skb_dequeue(inputq, dport); 2503 if (!skb) 2504 return; 2505 2506 /* Try secondary lookup if unresolved named message */ 2507 err = TIPC_ERR_NO_PORT; 2508 if (tipc_msg_lookup_dest(net, skb, &err)) 2509 goto xmit; 2510 2511 /* Prepare for message rejection */ 2512 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2513 continue; 2514 2515 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2516xmit: 2517 dnode = msg_destnode(buf_msg(skb)); 2518 tipc_node_xmit_skb(net, skb, dnode, dport); 2519 } 2520} 2521 2522static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2523{ 2524 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2525 struct sock *sk = sock->sk; 2526 int done; 2527 2528 do { 2529 int err = sock_error(sk); 2530 if (err) 2531 return err; 2532 if (!*timeo_p) 2533 return -ETIMEDOUT; 2534 if (signal_pending(current)) 2535 return sock_intr_errno(*timeo_p); 2536 if (sk->sk_state == TIPC_DISCONNECTING) 2537 break; 2538 2539 add_wait_queue(sk_sleep(sk), &wait); 2540 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2541 &wait); 2542 remove_wait_queue(sk_sleep(sk), &wait); 2543 } while (!done); 2544 return 0; 2545} 2546 2547static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2548{ 2549 if (addr->family != AF_TIPC) 2550 return false; 2551 if (addr->addrtype == TIPC_SERVICE_RANGE) 2552 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2553 return (addr->addrtype == TIPC_SERVICE_ADDR || 2554 addr->addrtype == TIPC_SOCKET_ADDR); 2555} 2556 2557/** 2558 * tipc_connect - establish a connection to another TIPC port 2559 * @sock: socket structure 2560 * @dest: socket address for destination port 2561 * @destlen: size of socket address data structure 2562 * @flags: file-related flags associated with socket 2563 * 2564 * Returns 0 on success, errno otherwise 2565 */ 2566static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2567 int destlen, int flags) 2568{ 2569 struct sock *sk = sock->sk; 2570 struct tipc_sock *tsk = tipc_sk(sk); 2571 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2572 struct msghdr m = {NULL,}; 2573 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2574 int previous; 2575 int res = 0; 2576 2577 if (destlen != sizeof(struct sockaddr_tipc)) 2578 return -EINVAL; 2579 2580 lock_sock(sk); 2581 2582 if (tsk->group) { 2583 res = -EINVAL; 2584 goto exit; 2585 } 2586 2587 if (dst->family == AF_UNSPEC) { 2588 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2589 if (!tipc_sk_type_connectionless(sk)) 2590 res = -EINVAL; 2591 goto exit; 2592 } 2593 if (!tipc_sockaddr_is_sane(dst)) { 2594 res = -EINVAL; 2595 goto exit; 2596 } 2597 /* DGRAM/RDM connect(), just save the destaddr */ 2598 if (tipc_sk_type_connectionless(sk)) { 2599 memcpy(&tsk->peer, dest, destlen); 2600 goto exit; 2601 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2602 res = -EINVAL; 2603 goto exit; 2604 } 2605 2606 previous = sk->sk_state; 2607 2608 switch (sk->sk_state) { 2609 case TIPC_OPEN: 2610 /* Send a 'SYN-' to destination */ 2611 m.msg_name = dest; 2612 m.msg_namelen = destlen; 2613 2614 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2615 * indicate send_msg() is never blocked. 2616 */ 2617 if (!timeout) 2618 m.msg_flags = MSG_DONTWAIT; 2619 2620 res = __tipc_sendmsg(sock, &m, 0); 2621 if ((res < 0) && (res != -EWOULDBLOCK)) 2622 goto exit; 2623 2624 /* Just entered TIPC_CONNECTING state; the only 2625 * difference is that return value in non-blocking 2626 * case is EINPROGRESS, rather than EALREADY. 2627 */ 2628 res = -EINPROGRESS; 2629 fallthrough; 2630 case TIPC_CONNECTING: 2631 if (!timeout) { 2632 if (previous == TIPC_CONNECTING) 2633 res = -EALREADY; 2634 goto exit; 2635 } 2636 timeout = msecs_to_jiffies(timeout); 2637 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2638 res = tipc_wait_for_connect(sock, &timeout); 2639 break; 2640 case TIPC_ESTABLISHED: 2641 res = -EISCONN; 2642 break; 2643 default: 2644 res = -EINVAL; 2645 } 2646 2647exit: 2648 release_sock(sk); 2649 return res; 2650} 2651 2652/** 2653 * tipc_listen - allow socket to listen for incoming connections 2654 * @sock: socket structure 2655 * @len: (unused) 2656 * 2657 * Returns 0 on success, errno otherwise 2658 */ 2659static int tipc_listen(struct socket *sock, int len) 2660{ 2661 struct sock *sk = sock->sk; 2662 int res; 2663 2664 lock_sock(sk); 2665 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2666 release_sock(sk); 2667 2668 return res; 2669} 2670 2671static int tipc_wait_for_accept(struct socket *sock, long timeo) 2672{ 2673 struct sock *sk = sock->sk; 2674 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2675 int err; 2676 2677 /* True wake-one mechanism for incoming connections: only 2678 * one process gets woken up, not the 'whole herd'. 2679 * Since we do not 'race & poll' for established sockets 2680 * anymore, the common case will execute the loop only once. 2681 */ 2682 for (;;) { 2683 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2684 add_wait_queue(sk_sleep(sk), &wait); 2685 release_sock(sk); 2686 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 2687 lock_sock(sk); 2688 remove_wait_queue(sk_sleep(sk), &wait); 2689 } 2690 err = 0; 2691 if (!skb_queue_empty(&sk->sk_receive_queue)) 2692 break; 2693 err = -EAGAIN; 2694 if (!timeo) 2695 break; 2696 err = sock_intr_errno(timeo); 2697 if (signal_pending(current)) 2698 break; 2699 } 2700 return err; 2701} 2702 2703/** 2704 * tipc_accept - wait for connection request 2705 * @sock: listening socket 2706 * @new_sock: new socket that is to be connected 2707 * @flags: file-related flags associated with socket 2708 * 2709 * Returns 0 on success, errno otherwise 2710 */ 2711static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2712 bool kern) 2713{ 2714 struct sock *new_sk, *sk = sock->sk; 2715 struct tipc_sock *new_tsock; 2716 struct msghdr m = {NULL,}; 2717 struct tipc_msg *msg; 2718 struct sk_buff *buf; 2719 long timeo; 2720 int res; 2721 2722 lock_sock(sk); 2723 2724 if (sk->sk_state != TIPC_LISTEN) { 2725 res = -EINVAL; 2726 goto exit; 2727 } 2728 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2729 res = tipc_wait_for_accept(sock, timeo); 2730 if (res) 2731 goto exit; 2732 2733 buf = skb_peek(&sk->sk_receive_queue); 2734 2735 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2736 if (res) 2737 goto exit; 2738 security_sk_clone(sock->sk, new_sock->sk); 2739 2740 new_sk = new_sock->sk; 2741 new_tsock = tipc_sk(new_sk); 2742 msg = buf_msg(buf); 2743 2744 /* we lock on new_sk; but lockdep sees the lock on sk */ 2745 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2746 2747 /* 2748 * Reject any stray messages received by new socket 2749 * before the socket lock was taken (very, very unlikely) 2750 */ 2751 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2752 2753 /* Connect new socket to it's peer */ 2754 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2755 2756 tsk_set_importance(new_sk, msg_importance(msg)); 2757 if (msg_named(msg)) { 2758 new_tsock->conn_type = msg_nametype(msg); 2759 new_tsock->conn_instance = msg_nameinst(msg); 2760 } 2761 2762 /* 2763 * Respond to 'SYN-' by discarding it & returning 'ACK'. 2764 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'. 2765 */ 2766 if (!msg_data_sz(msg)) { 2767 tsk_advance_rx_queue(sk); 2768 } else { 2769 __skb_dequeue(&sk->sk_receive_queue); 2770 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2771 skb_set_owner_r(buf, new_sk); 2772 } 2773 __tipc_sendstream(new_sock, &m, 0); 2774 release_sock(new_sk); 2775exit: 2776 release_sock(sk); 2777 return res; 2778} 2779 2780/** 2781 * tipc_shutdown - shutdown socket connection 2782 * @sock: socket structure 2783 * @how: direction to close (must be SHUT_RDWR) 2784 * 2785 * Terminates connection (if necessary), then purges socket's receive queue. 2786 * 2787 * Returns 0 on success, errno otherwise 2788 */ 2789static int tipc_shutdown(struct socket *sock, int how) 2790{ 2791 struct sock *sk = sock->sk; 2792 int res; 2793 2794 if (how != SHUT_RDWR) 2795 return -EINVAL; 2796 2797 lock_sock(sk); 2798 2799 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2800 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2801 sk->sk_shutdown = SHUTDOWN_MASK; 2802 2803 if (sk->sk_state == TIPC_DISCONNECTING) { 2804 /* Discard any unreceived messages */ 2805 __skb_queue_purge(&sk->sk_receive_queue); 2806 2807 res = 0; 2808 } else { 2809 res = -ENOTCONN; 2810 } 2811 /* Wake up anyone sleeping in poll. */ 2812 sk->sk_state_change(sk); 2813 2814 release_sock(sk); 2815 return res; 2816} 2817 2818static void tipc_sk_check_probing_state(struct sock *sk, 2819 struct sk_buff_head *list) 2820{ 2821 struct tipc_sock *tsk = tipc_sk(sk); 2822 u32 pnode = tsk_peer_node(tsk); 2823 u32 pport = tsk_peer_port(tsk); 2824 u32 self = tsk_own_node(tsk); 2825 u32 oport = tsk->portid; 2826 struct sk_buff *skb; 2827 2828 if (tsk->probe_unacked) { 2829 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2830 sk->sk_err = ECONNABORTED; 2831 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2832 sk->sk_state_change(sk); 2833 return; 2834 } 2835 /* Prepare new probe */ 2836 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2837 pnode, self, pport, oport, TIPC_OK); 2838 if (skb) 2839 __skb_queue_tail(list, skb); 2840 tsk->probe_unacked = true; 2841 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2842} 2843 2844static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2845{ 2846 struct tipc_sock *tsk = tipc_sk(sk); 2847 2848 /* Try again later if dest link is congested */ 2849 if (tsk->cong_link_cnt) { 2850 sk_reset_timer(sk, &sk->sk_timer, 2851 jiffies + msecs_to_jiffies(100)); 2852 return; 2853 } 2854 /* Prepare SYN for retransmit */ 2855 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2856} 2857 2858static void tipc_sk_timeout(struct timer_list *t) 2859{ 2860 struct sock *sk = from_timer(sk, t, sk_timer); 2861 struct tipc_sock *tsk = tipc_sk(sk); 2862 u32 pnode = tsk_peer_node(tsk); 2863 struct sk_buff_head list; 2864 int rc = 0; 2865 2866 __skb_queue_head_init(&list); 2867 bh_lock_sock(sk); 2868 2869 /* Try again later if socket is busy */ 2870 if (sock_owned_by_user(sk)) { 2871 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2872 bh_unlock_sock(sk); 2873 sock_put(sk); 2874 return; 2875 } 2876 2877 if (sk->sk_state == TIPC_ESTABLISHED) 2878 tipc_sk_check_probing_state(sk, &list); 2879 else if (sk->sk_state == TIPC_CONNECTING) 2880 tipc_sk_retry_connect(sk, &list); 2881 2882 bh_unlock_sock(sk); 2883 2884 if (!skb_queue_empty(&list)) 2885 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2886 2887 /* SYN messages may cause link congestion */ 2888 if (rc == -ELINKCONG) { 2889 tipc_dest_push(&tsk->cong_links, pnode, 0); 2890 tsk->cong_link_cnt = 1; 2891 } 2892 sock_put(sk); 2893} 2894 2895static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 2896 struct tipc_name_seq const *seq) 2897{ 2898 struct sock *sk = &tsk->sk; 2899 struct net *net = sock_net(sk); 2900 struct publication *publ; 2901 u32 key; 2902 2903 if (scope != TIPC_NODE_SCOPE) 2904 scope = TIPC_CLUSTER_SCOPE; 2905 2906 if (tipc_sk_connected(sk)) 2907 return -EINVAL; 2908 key = tsk->portid + tsk->pub_count + 1; 2909 if (key == tsk->portid) 2910 return -EADDRINUSE; 2911 2912 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper, 2913 scope, tsk->portid, key); 2914 if (unlikely(!publ)) 2915 return -EINVAL; 2916 2917 list_add(&publ->binding_sock, &tsk->publications); 2918 tsk->pub_count++; 2919 tsk->published = 1; 2920 return 0; 2921} 2922 2923static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 2924 struct tipc_name_seq const *seq) 2925{ 2926 struct net *net = sock_net(&tsk->sk); 2927 struct publication *publ; 2928 struct publication *safe; 2929 int rc = -EINVAL; 2930 2931 if (scope != TIPC_NODE_SCOPE) 2932 scope = TIPC_CLUSTER_SCOPE; 2933 2934 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) { 2935 if (seq) { 2936 if (publ->scope != scope) 2937 continue; 2938 if (publ->type != seq->type) 2939 continue; 2940 if (publ->lower != seq->lower) 2941 continue; 2942 if (publ->upper != seq->upper) 2943 break; 2944 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2945 publ->upper, publ->key); 2946 rc = 0; 2947 break; 2948 } 2949 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2950 publ->upper, publ->key); 2951 rc = 0; 2952 } 2953 if (list_empty(&tsk->publications)) 2954 tsk->published = 0; 2955 return rc; 2956} 2957 2958/* tipc_sk_reinit: set non-zero address in all existing sockets 2959 * when we go from standalone to network mode. 2960 */ 2961void tipc_sk_reinit(struct net *net) 2962{ 2963 struct tipc_net *tn = net_generic(net, tipc_net_id); 2964 struct rhashtable_iter iter; 2965 struct tipc_sock *tsk; 2966 struct tipc_msg *msg; 2967 2968 rhashtable_walk_enter(&tn->sk_rht, &iter); 2969 2970 do { 2971 rhashtable_walk_start(&iter); 2972 2973 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2974 sock_hold(&tsk->sk); 2975 rhashtable_walk_stop(&iter); 2976 lock_sock(&tsk->sk); 2977 msg = &tsk->phdr; 2978 msg_set_prevnode(msg, tipc_own_addr(net)); 2979 msg_set_orignode(msg, tipc_own_addr(net)); 2980 release_sock(&tsk->sk); 2981 rhashtable_walk_start(&iter); 2982 sock_put(&tsk->sk); 2983 } 2984 2985 rhashtable_walk_stop(&iter); 2986 } while (tsk == ERR_PTR(-EAGAIN)); 2987 2988 rhashtable_walk_exit(&iter); 2989} 2990 2991static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2992{ 2993 struct tipc_net *tn = net_generic(net, tipc_net_id); 2994 struct tipc_sock *tsk; 2995 2996 rcu_read_lock(); 2997 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2998 if (tsk) 2999 sock_hold(&tsk->sk); 3000 rcu_read_unlock(); 3001 3002 return tsk; 3003} 3004 3005static int tipc_sk_insert(struct tipc_sock *tsk) 3006{ 3007 struct sock *sk = &tsk->sk; 3008 struct net *net = sock_net(sk); 3009 struct tipc_net *tn = net_generic(net, tipc_net_id); 3010 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 3011 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 3012 3013 while (remaining--) { 3014 portid++; 3015 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 3016 portid = TIPC_MIN_PORT; 3017 tsk->portid = portid; 3018 sock_hold(&tsk->sk); 3019 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 3020 tsk_rht_params)) 3021 return 0; 3022 sock_put(&tsk->sk); 3023 } 3024 3025 return -1; 3026} 3027 3028static void tipc_sk_remove(struct tipc_sock *tsk) 3029{ 3030 struct sock *sk = &tsk->sk; 3031 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3032 3033 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3034 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3035 __sock_put(sk); 3036 } 3037} 3038 3039static const struct rhashtable_params tsk_rht_params = { 3040 .nelem_hint = 192, 3041 .head_offset = offsetof(struct tipc_sock, node), 3042 .key_offset = offsetof(struct tipc_sock, portid), 3043 .key_len = sizeof(u32), /* portid */ 3044 .max_size = 1048576, 3045 .min_size = 256, 3046 .automatic_shrinking = true, 3047}; 3048 3049int tipc_sk_rht_init(struct net *net) 3050{ 3051 struct tipc_net *tn = net_generic(net, tipc_net_id); 3052 3053 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3054} 3055 3056void tipc_sk_rht_destroy(struct net *net) 3057{ 3058 struct tipc_net *tn = net_generic(net, tipc_net_id); 3059 3060 /* Wait for socket readers to complete */ 3061 synchronize_net(); 3062 3063 rhashtable_destroy(&tn->sk_rht); 3064} 3065 3066static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3067{ 3068 struct net *net = sock_net(&tsk->sk); 3069 struct tipc_group *grp = tsk->group; 3070 struct tipc_msg *hdr = &tsk->phdr; 3071 struct tipc_name_seq seq; 3072 int rc; 3073 3074 if (mreq->type < TIPC_RESERVED_TYPES) 3075 return -EACCES; 3076 if (mreq->scope > TIPC_NODE_SCOPE) 3077 return -EINVAL; 3078 if (grp) 3079 return -EACCES; 3080 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3081 if (!grp) 3082 return -ENOMEM; 3083 tsk->group = grp; 3084 msg_set_lookup_scope(hdr, mreq->scope); 3085 msg_set_nametype(hdr, mreq->type); 3086 msg_set_dest_droppable(hdr, true); 3087 seq.type = mreq->type; 3088 seq.lower = mreq->instance; 3089 seq.upper = seq.lower; 3090 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope); 3091 rc = tipc_sk_publish(tsk, mreq->scope, &seq); 3092 if (rc) { 3093 tipc_group_delete(net, grp); 3094 tsk->group = NULL; 3095 return rc; 3096 } 3097 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3098 tsk->mc_method.rcast = true; 3099 tsk->mc_method.mandatory = true; 3100 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3101 return rc; 3102} 3103 3104static int tipc_sk_leave(struct tipc_sock *tsk) 3105{ 3106 struct net *net = sock_net(&tsk->sk); 3107 struct tipc_group *grp = tsk->group; 3108 struct tipc_name_seq seq; 3109 int scope; 3110 3111 if (!grp) 3112 return -EINVAL; 3113 tipc_group_self(grp, &seq, &scope); 3114 tipc_group_delete(net, grp); 3115 tsk->group = NULL; 3116 tipc_sk_withdraw(tsk, scope, &seq); 3117 return 0; 3118} 3119 3120/** 3121 * tipc_setsockopt - set socket option 3122 * @sock: socket structure 3123 * @lvl: option level 3124 * @opt: option identifier 3125 * @ov: pointer to new option value 3126 * @ol: length of option value 3127 * 3128 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3129 * (to ease compatibility). 3130 * 3131 * Returns 0 on success, errno otherwise 3132 */ 3133static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3134 sockptr_t ov, unsigned int ol) 3135{ 3136 struct sock *sk = sock->sk; 3137 struct tipc_sock *tsk = tipc_sk(sk); 3138 struct tipc_group_req mreq; 3139 u32 value = 0; 3140 int res = 0; 3141 3142 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3143 return 0; 3144 if (lvl != SOL_TIPC) 3145 return -ENOPROTOOPT; 3146 3147 switch (opt) { 3148 case TIPC_IMPORTANCE: 3149 case TIPC_SRC_DROPPABLE: 3150 case TIPC_DEST_DROPPABLE: 3151 case TIPC_CONN_TIMEOUT: 3152 case TIPC_NODELAY: 3153 if (ol < sizeof(value)) 3154 return -EINVAL; 3155 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3156 return -EFAULT; 3157 break; 3158 case TIPC_GROUP_JOIN: 3159 if (ol < sizeof(mreq)) 3160 return -EINVAL; 3161 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3162 return -EFAULT; 3163 break; 3164 default: 3165 if (!sockptr_is_null(ov) || ol) 3166 return -EINVAL; 3167 } 3168 3169 lock_sock(sk); 3170 3171 switch (opt) { 3172 case TIPC_IMPORTANCE: 3173 res = tsk_set_importance(sk, value); 3174 break; 3175 case TIPC_SRC_DROPPABLE: 3176 if (sock->type != SOCK_STREAM) 3177 tsk_set_unreliable(tsk, value); 3178 else 3179 res = -ENOPROTOOPT; 3180 break; 3181 case TIPC_DEST_DROPPABLE: 3182 tsk_set_unreturnable(tsk, value); 3183 break; 3184 case TIPC_CONN_TIMEOUT: 3185 tipc_sk(sk)->conn_timeout = value; 3186 break; 3187 case TIPC_MCAST_BROADCAST: 3188 tsk->mc_method.rcast = false; 3189 tsk->mc_method.mandatory = true; 3190 break; 3191 case TIPC_MCAST_REPLICAST: 3192 tsk->mc_method.rcast = true; 3193 tsk->mc_method.mandatory = true; 3194 break; 3195 case TIPC_GROUP_JOIN: 3196 res = tipc_sk_join(tsk, &mreq); 3197 break; 3198 case TIPC_GROUP_LEAVE: 3199 res = tipc_sk_leave(tsk); 3200 break; 3201 case TIPC_NODELAY: 3202 tsk->nodelay = !!value; 3203 tsk_set_nagle(tsk); 3204 break; 3205 default: 3206 res = -EINVAL; 3207 } 3208 3209 release_sock(sk); 3210 3211 return res; 3212} 3213 3214/** 3215 * tipc_getsockopt - get socket option 3216 * @sock: socket structure 3217 * @lvl: option level 3218 * @opt: option identifier 3219 * @ov: receptacle for option value 3220 * @ol: receptacle for length of option value 3221 * 3222 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3223 * (to ease compatibility). 3224 * 3225 * Returns 0 on success, errno otherwise 3226 */ 3227static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3228 char __user *ov, int __user *ol) 3229{ 3230 struct sock *sk = sock->sk; 3231 struct tipc_sock *tsk = tipc_sk(sk); 3232 struct tipc_name_seq seq; 3233 int len, scope; 3234 u32 value; 3235 int res; 3236 3237 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3238 return put_user(0, ol); 3239 if (lvl != SOL_TIPC) 3240 return -ENOPROTOOPT; 3241 res = get_user(len, ol); 3242 if (res) 3243 return res; 3244 3245 lock_sock(sk); 3246 3247 switch (opt) { 3248 case TIPC_IMPORTANCE: 3249 value = tsk_importance(tsk); 3250 break; 3251 case TIPC_SRC_DROPPABLE: 3252 value = tsk_unreliable(tsk); 3253 break; 3254 case TIPC_DEST_DROPPABLE: 3255 value = tsk_unreturnable(tsk); 3256 break; 3257 case TIPC_CONN_TIMEOUT: 3258 value = tsk->conn_timeout; 3259 /* no need to set "res", since already 0 at this point */ 3260 break; 3261 case TIPC_NODE_RECVQ_DEPTH: 3262 value = 0; /* was tipc_queue_size, now obsolete */ 3263 break; 3264 case TIPC_SOCK_RECVQ_DEPTH: 3265 value = skb_queue_len(&sk->sk_receive_queue); 3266 break; 3267 case TIPC_SOCK_RECVQ_USED: 3268 value = sk_rmem_alloc_get(sk); 3269 break; 3270 case TIPC_GROUP_JOIN: 3271 seq.type = 0; 3272 if (tsk->group) 3273 tipc_group_self(tsk->group, &seq, &scope); 3274 value = seq.type; 3275 break; 3276 default: 3277 res = -EINVAL; 3278 } 3279 3280 release_sock(sk); 3281 3282 if (res) 3283 return res; /* "get" failed */ 3284 3285 if (len < sizeof(value)) 3286 return -EINVAL; 3287 3288 if (copy_to_user(ov, &value, sizeof(value))) 3289 return -EFAULT; 3290 3291 return put_user(sizeof(value), ol); 3292} 3293 3294static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3295{ 3296 struct net *net = sock_net(sock->sk); 3297 struct tipc_sioc_nodeid_req nr = {0}; 3298 struct tipc_sioc_ln_req lnr; 3299 void __user *argp = (void __user *)arg; 3300 3301 switch (cmd) { 3302 case SIOCGETLINKNAME: 3303 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3304 return -EFAULT; 3305 if (!tipc_node_get_linkname(net, 3306 lnr.bearer_id & 0xffff, lnr.peer, 3307 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3308 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3309 return -EFAULT; 3310 return 0; 3311 } 3312 return -EADDRNOTAVAIL; 3313 case SIOCGETNODEID: 3314 if (copy_from_user(&nr, argp, sizeof(nr))) 3315 return -EFAULT; 3316 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3317 return -EADDRNOTAVAIL; 3318 if (copy_to_user(argp, &nr, sizeof(nr))) 3319 return -EFAULT; 3320 return 0; 3321 default: 3322 return -ENOIOCTLCMD; 3323 } 3324} 3325 3326static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3327{ 3328 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3329 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3330 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3331 3332 tsk1->peer.family = AF_TIPC; 3333 tsk1->peer.addrtype = TIPC_ADDR_ID; 3334 tsk1->peer.scope = TIPC_NODE_SCOPE; 3335 tsk1->peer.addr.id.ref = tsk2->portid; 3336 tsk1->peer.addr.id.node = onode; 3337 tsk2->peer.family = AF_TIPC; 3338 tsk2->peer.addrtype = TIPC_ADDR_ID; 3339 tsk2->peer.scope = TIPC_NODE_SCOPE; 3340 tsk2->peer.addr.id.ref = tsk1->portid; 3341 tsk2->peer.addr.id.node = onode; 3342 3343 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3344 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3345 return 0; 3346} 3347 3348/* Protocol switches for the various types of TIPC sockets */ 3349 3350static const struct proto_ops msg_ops = { 3351 .owner = THIS_MODULE, 3352 .family = AF_TIPC, 3353 .release = tipc_release, 3354 .bind = tipc_bind, 3355 .connect = tipc_connect, 3356 .socketpair = tipc_socketpair, 3357 .accept = sock_no_accept, 3358 .getname = tipc_getname, 3359 .poll = tipc_poll, 3360 .ioctl = tipc_ioctl, 3361 .listen = sock_no_listen, 3362 .shutdown = tipc_shutdown, 3363 .setsockopt = tipc_setsockopt, 3364 .getsockopt = tipc_getsockopt, 3365 .sendmsg = tipc_sendmsg, 3366 .recvmsg = tipc_recvmsg, 3367 .mmap = sock_no_mmap, 3368 .sendpage = sock_no_sendpage 3369}; 3370 3371static const struct proto_ops packet_ops = { 3372 .owner = THIS_MODULE, 3373 .family = AF_TIPC, 3374 .release = tipc_release, 3375 .bind = tipc_bind, 3376 .connect = tipc_connect, 3377 .socketpair = tipc_socketpair, 3378 .accept = tipc_accept, 3379 .getname = tipc_getname, 3380 .poll = tipc_poll, 3381 .ioctl = tipc_ioctl, 3382 .listen = tipc_listen, 3383 .shutdown = tipc_shutdown, 3384 .setsockopt = tipc_setsockopt, 3385 .getsockopt = tipc_getsockopt, 3386 .sendmsg = tipc_send_packet, 3387 .recvmsg = tipc_recvmsg, 3388 .mmap = sock_no_mmap, 3389 .sendpage = sock_no_sendpage 3390}; 3391 3392static const struct proto_ops stream_ops = { 3393 .owner = THIS_MODULE, 3394 .family = AF_TIPC, 3395 .release = tipc_release, 3396 .bind = tipc_bind, 3397 .connect = tipc_connect, 3398 .socketpair = tipc_socketpair, 3399 .accept = tipc_accept, 3400 .getname = tipc_getname, 3401 .poll = tipc_poll, 3402 .ioctl = tipc_ioctl, 3403 .listen = tipc_listen, 3404 .shutdown = tipc_shutdown, 3405 .setsockopt = tipc_setsockopt, 3406 .getsockopt = tipc_getsockopt, 3407 .sendmsg = tipc_sendstream, 3408 .recvmsg = tipc_recvstream, 3409 .mmap = sock_no_mmap, 3410 .sendpage = sock_no_sendpage 3411}; 3412 3413static const struct net_proto_family tipc_family_ops = { 3414 .owner = THIS_MODULE, 3415 .family = AF_TIPC, 3416 .create = tipc_sk_create 3417}; 3418 3419static struct proto tipc_proto = { 3420 .name = "TIPC", 3421 .owner = THIS_MODULE, 3422 .obj_size = sizeof(struct tipc_sock), 3423 .sysctl_rmem = sysctl_tipc_rmem 3424}; 3425 3426/** 3427 * tipc_socket_init - initialize TIPC socket interface 3428 * 3429 * Returns 0 on success, errno otherwise 3430 */ 3431int tipc_socket_init(void) 3432{ 3433 int res; 3434 3435 res = proto_register(&tipc_proto, 1); 3436 if (res) { 3437 pr_err("Failed to register TIPC protocol type\n"); 3438 goto out; 3439 } 3440 3441 res = sock_register(&tipc_family_ops); 3442 if (res) { 3443 pr_err("Failed to register TIPC socket type\n"); 3444 proto_unregister(&tipc_proto); 3445 goto out; 3446 } 3447 out: 3448 return res; 3449} 3450 3451/** 3452 * tipc_socket_stop - stop TIPC socket interface 3453 */ 3454void tipc_socket_stop(void) 3455{ 3456 sock_unregister(tipc_family_ops.family); 3457 proto_unregister(&tipc_proto); 3458} 3459 3460/* Caller should hold socket lock for the passed tipc socket. */ 3461static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3462{ 3463 u32 peer_node; 3464 u32 peer_port; 3465 struct nlattr *nest; 3466 3467 peer_node = tsk_peer_node(tsk); 3468 peer_port = tsk_peer_port(tsk); 3469 3470 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3471 if (!nest) 3472 return -EMSGSIZE; 3473 3474 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3475 goto msg_full; 3476 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3477 goto msg_full; 3478 3479 if (tsk->conn_type != 0) { 3480 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3481 goto msg_full; 3482 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) 3483 goto msg_full; 3484 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) 3485 goto msg_full; 3486 } 3487 nla_nest_end(skb, nest); 3488 3489 return 0; 3490 3491msg_full: 3492 nla_nest_cancel(skb, nest); 3493 3494 return -EMSGSIZE; 3495} 3496 3497static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3498 *tsk) 3499{ 3500 struct net *net = sock_net(skb->sk); 3501 struct sock *sk = &tsk->sk; 3502 3503 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3504 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3505 return -EMSGSIZE; 3506 3507 if (tipc_sk_connected(sk)) { 3508 if (__tipc_nl_add_sk_con(skb, tsk)) 3509 return -EMSGSIZE; 3510 } else if (!list_empty(&tsk->publications)) { 3511 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3512 return -EMSGSIZE; 3513 } 3514 return 0; 3515} 3516 3517/* Caller should hold socket lock for the passed tipc socket. */ 3518static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3519 struct tipc_sock *tsk) 3520{ 3521 struct nlattr *attrs; 3522 void *hdr; 3523 3524 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3525 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3526 if (!hdr) 3527 goto msg_cancel; 3528 3529 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3530 if (!attrs) 3531 goto genlmsg_cancel; 3532 3533 if (__tipc_nl_add_sk_info(skb, tsk)) 3534 goto attr_msg_cancel; 3535 3536 nla_nest_end(skb, attrs); 3537 genlmsg_end(skb, hdr); 3538 3539 return 0; 3540 3541attr_msg_cancel: 3542 nla_nest_cancel(skb, attrs); 3543genlmsg_cancel: 3544 genlmsg_cancel(skb, hdr); 3545msg_cancel: 3546 return -EMSGSIZE; 3547} 3548 3549int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3550 int (*skb_handler)(struct sk_buff *skb, 3551 struct netlink_callback *cb, 3552 struct tipc_sock *tsk)) 3553{ 3554 struct rhashtable_iter *iter = (void *)cb->args[4]; 3555 struct tipc_sock *tsk; 3556 int err; 3557 3558 rhashtable_walk_start(iter); 3559 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3560 if (IS_ERR(tsk)) { 3561 err = PTR_ERR(tsk); 3562 if (err == -EAGAIN) { 3563 err = 0; 3564 continue; 3565 } 3566 break; 3567 } 3568 3569 sock_hold(&tsk->sk); 3570 rhashtable_walk_stop(iter); 3571 lock_sock(&tsk->sk); 3572 err = skb_handler(skb, cb, tsk); 3573 if (err) { 3574 release_sock(&tsk->sk); 3575 sock_put(&tsk->sk); 3576 goto out; 3577 } 3578 release_sock(&tsk->sk); 3579 rhashtable_walk_start(iter); 3580 sock_put(&tsk->sk); 3581 } 3582 rhashtable_walk_stop(iter); 3583out: 3584 return skb->len; 3585} 3586EXPORT_SYMBOL(tipc_nl_sk_walk); 3587 3588int tipc_dump_start(struct netlink_callback *cb) 3589{ 3590 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3591} 3592EXPORT_SYMBOL(tipc_dump_start); 3593 3594int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3595{ 3596 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3597 struct rhashtable_iter *iter = (void *)cb->args[4]; 3598 struct tipc_net *tn = tipc_net(net); 3599 3600 if (!iter) { 3601 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3602 if (!iter) 3603 return -ENOMEM; 3604 3605 cb->args[4] = (long)iter; 3606 } 3607 3608 rhashtable_walk_enter(&tn->sk_rht, iter); 3609 return 0; 3610} 3611 3612int tipc_dump_done(struct netlink_callback *cb) 3613{ 3614 struct rhashtable_iter *hti = (void *)cb->args[4]; 3615 3616 rhashtable_walk_exit(hti); 3617 kfree(hti); 3618 return 0; 3619} 3620EXPORT_SYMBOL(tipc_dump_done); 3621 3622int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3623 struct tipc_sock *tsk, u32 sk_filter_state, 3624 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3625{ 3626 struct sock *sk = &tsk->sk; 3627 struct nlattr *attrs; 3628 struct nlattr *stat; 3629 3630 /*filter response w.r.t sk_state*/ 3631 if (!(sk_filter_state & (1 << sk->sk_state))) 3632 return 0; 3633 3634 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3635 if (!attrs) 3636 goto msg_cancel; 3637 3638 if (__tipc_nl_add_sk_info(skb, tsk)) 3639 goto attr_msg_cancel; 3640 3641 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3642 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3643 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3644 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3645 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3646 sock_i_uid(sk))) || 3647 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3648 tipc_diag_gen_cookie(sk), 3649 TIPC_NLA_SOCK_PAD)) 3650 goto attr_msg_cancel; 3651 3652 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3653 if (!stat) 3654 goto attr_msg_cancel; 3655 3656 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3657 skb_queue_len(&sk->sk_receive_queue)) || 3658 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3659 skb_queue_len(&sk->sk_write_queue)) || 3660 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3661 atomic_read(&sk->sk_drops))) 3662 goto stat_msg_cancel; 3663 3664 if (tsk->cong_link_cnt && 3665 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3666 goto stat_msg_cancel; 3667 3668 if (tsk_conn_cong(tsk) && 3669 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3670 goto stat_msg_cancel; 3671 3672 nla_nest_end(skb, stat); 3673 3674 if (tsk->group) 3675 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3676 goto stat_msg_cancel; 3677 3678 nla_nest_end(skb, attrs); 3679 3680 return 0; 3681 3682stat_msg_cancel: 3683 nla_nest_cancel(skb, stat); 3684attr_msg_cancel: 3685 nla_nest_cancel(skb, attrs); 3686msg_cancel: 3687 return -EMSGSIZE; 3688} 3689EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3690 3691int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3692{ 3693 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3694} 3695 3696/* Caller should hold socket lock for the passed tipc socket. */ 3697static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3698 struct netlink_callback *cb, 3699 struct publication *publ) 3700{ 3701 void *hdr; 3702 struct nlattr *attrs; 3703 3704 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3705 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3706 if (!hdr) 3707 goto msg_cancel; 3708 3709 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3710 if (!attrs) 3711 goto genlmsg_cancel; 3712 3713 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3714 goto attr_msg_cancel; 3715 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) 3716 goto attr_msg_cancel; 3717 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) 3718 goto attr_msg_cancel; 3719 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) 3720 goto attr_msg_cancel; 3721 3722 nla_nest_end(skb, attrs); 3723 genlmsg_end(skb, hdr); 3724 3725 return 0; 3726 3727attr_msg_cancel: 3728 nla_nest_cancel(skb, attrs); 3729genlmsg_cancel: 3730 genlmsg_cancel(skb, hdr); 3731msg_cancel: 3732 return -EMSGSIZE; 3733} 3734 3735/* Caller should hold socket lock for the passed tipc socket. */ 3736static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3737 struct netlink_callback *cb, 3738 struct tipc_sock *tsk, u32 *last_publ) 3739{ 3740 int err; 3741 struct publication *p; 3742 3743 if (*last_publ) { 3744 list_for_each_entry(p, &tsk->publications, binding_sock) { 3745 if (p->key == *last_publ) 3746 break; 3747 } 3748 if (list_entry_is_head(p, &tsk->publications, binding_sock)) { 3749 /* We never set seq or call nl_dump_check_consistent() 3750 * this means that setting prev_seq here will cause the 3751 * consistence check to fail in the netlink callback 3752 * handler. Resulting in the last NLMSG_DONE message 3753 * having the NLM_F_DUMP_INTR flag set. 3754 */ 3755 cb->prev_seq = 1; 3756 *last_publ = 0; 3757 return -EPIPE; 3758 } 3759 } else { 3760 p = list_first_entry(&tsk->publications, struct publication, 3761 binding_sock); 3762 } 3763 3764 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3765 err = __tipc_nl_add_sk_publ(skb, cb, p); 3766 if (err) { 3767 *last_publ = p->key; 3768 return err; 3769 } 3770 } 3771 *last_publ = 0; 3772 3773 return 0; 3774} 3775 3776int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3777{ 3778 int err; 3779 u32 tsk_portid = cb->args[0]; 3780 u32 last_publ = cb->args[1]; 3781 u32 done = cb->args[2]; 3782 struct net *net = sock_net(skb->sk); 3783 struct tipc_sock *tsk; 3784 3785 if (!tsk_portid) { 3786 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3787 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3788 3789 if (!attrs[TIPC_NLA_SOCK]) 3790 return -EINVAL; 3791 3792 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3793 attrs[TIPC_NLA_SOCK], 3794 tipc_nl_sock_policy, NULL); 3795 if (err) 3796 return err; 3797 3798 if (!sock[TIPC_NLA_SOCK_REF]) 3799 return -EINVAL; 3800 3801 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3802 } 3803 3804 if (done) 3805 return 0; 3806 3807 tsk = tipc_sk_lookup(net, tsk_portid); 3808 if (!tsk) 3809 return -EINVAL; 3810 3811 lock_sock(&tsk->sk); 3812 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3813 if (!err) 3814 done = 1; 3815 release_sock(&tsk->sk); 3816 sock_put(&tsk->sk); 3817 3818 cb->args[0] = tsk_portid; 3819 cb->args[1] = last_publ; 3820 cb->args[2] = done; 3821 3822 return skb->len; 3823} 3824 3825/** 3826 * tipc_sk_filtering - check if a socket should be traced 3827 * @sk: the socket to be examined 3828 * @sysctl_tipc_sk_filter[]: the socket tuple for filtering, 3829 * (portid, sock type, name type, name lower, name upper) 3830 * 3831 * Returns true if the socket meets the socket tuple data 3832 * (value 0 = 'any') or when there is no tuple set (all = 0), 3833 * otherwise false 3834 */ 3835bool tipc_sk_filtering(struct sock *sk) 3836{ 3837 struct tipc_sock *tsk; 3838 struct publication *p; 3839 u32 _port, _sktype, _type, _lower, _upper; 3840 u32 type = 0, lower = 0, upper = 0; 3841 3842 if (!sk) 3843 return true; 3844 3845 tsk = tipc_sk(sk); 3846 3847 _port = sysctl_tipc_sk_filter[0]; 3848 _sktype = sysctl_tipc_sk_filter[1]; 3849 _type = sysctl_tipc_sk_filter[2]; 3850 _lower = sysctl_tipc_sk_filter[3]; 3851 _upper = sysctl_tipc_sk_filter[4]; 3852 3853 if (!_port && !_sktype && !_type && !_lower && !_upper) 3854 return true; 3855 3856 if (_port) 3857 return (_port == tsk->portid); 3858 3859 if (_sktype && _sktype != sk->sk_type) 3860 return false; 3861 3862 if (tsk->published) { 3863 p = list_first_entry_or_null(&tsk->publications, 3864 struct publication, binding_sock); 3865 if (p) { 3866 type = p->type; 3867 lower = p->lower; 3868 upper = p->upper; 3869 } 3870 } 3871 3872 if (!tipc_sk_type_connectionless(sk)) { 3873 type = tsk->conn_type; 3874 lower = tsk->conn_instance; 3875 upper = tsk->conn_instance; 3876 } 3877 3878 if ((_type && _type != type) || (_lower && _lower != lower) || 3879 (_upper && _upper != upper)) 3880 return false; 3881 3882 return true; 3883} 3884 3885u32 tipc_sock_get_portid(struct sock *sk) 3886{ 3887 return (sk) ? (tipc_sk(sk))->portid : 0; 3888} 3889 3890/** 3891 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3892 * both the rcv and backlog queues are considered 3893 * @sk: tipc sk to be checked 3894 * @skb: tipc msg to be checked 3895 * 3896 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3897 */ 3898 3899bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3900{ 3901 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3902 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3903 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3904 3905 return (qsize > lim * 90 / 100); 3906} 3907 3908/** 3909 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3910 * only the rcv queue is considered 3911 * @sk: tipc sk to be checked 3912 * @skb: tipc msg to be checked 3913 * 3914 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3915 */ 3916 3917bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3918{ 3919 unsigned int lim = rcvbuf_limit(sk, skb); 3920 unsigned int qsize = sk_rmem_alloc_get(sk); 3921 3922 return (qsize > lim * 90 / 100); 3923} 3924 3925/** 3926 * tipc_sk_dump - dump TIPC socket 3927 * @sk: tipc sk to be dumped 3928 * @dqueues: bitmask to decide if any socket queue to be dumped? 3929 * - TIPC_DUMP_NONE: don't dump socket queues 3930 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3931 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3932 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3933 * - TIPC_DUMP_ALL: dump all the socket queues above 3934 * @buf: returned buffer of dump data in format 3935 */ 3936int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3937{ 3938 int i = 0; 3939 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3940 struct tipc_sock *tsk; 3941 struct publication *p; 3942 bool tsk_connected; 3943 3944 if (!sk) { 3945 i += scnprintf(buf, sz, "sk data: (null)\n"); 3946 return i; 3947 } 3948 3949 tsk = tipc_sk(sk); 3950 tsk_connected = !tipc_sk_type_connectionless(sk); 3951 3952 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3953 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3954 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3955 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3956 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3957 if (tsk_connected) { 3958 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3959 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3960 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type); 3961 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance); 3962 } 3963 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3964 if (tsk->published) { 3965 p = list_first_entry_or_null(&tsk->publications, 3966 struct publication, binding_sock); 3967 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0); 3968 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0); 3969 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0); 3970 } 3971 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3972 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3973 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3974 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3975 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3976 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3977 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3978 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3979 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3980 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3981 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3982 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3983 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3984 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3985 3986 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3987 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3988 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3989 } 3990 3991 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3992 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3993 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3994 } 3995 3996 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 3997 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 3998 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 3999 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 4000 i += scnprintf(buf + i, sz - i, " tail "); 4001 i += tipc_skb_dump(sk->sk_backlog.tail, false, 4002 buf + i); 4003 } 4004 } 4005 4006 return i; 4007} 4008