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