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