1 /* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2007, 2012-2017, Ericsson AB 5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <linux/rhashtable.h> 38 #include <linux/sched/signal.h> 39 40 #include "core.h" 41 #include "name_table.h" 42 #include "node.h" 43 #include "link.h" 44 #include "name_distr.h" 45 #include "socket.h" 46 #include "bcast.h" 47 #include "netlink.h" 48 #include "group.h" 49 #include "trace.h" 50 51 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 52 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 53 #define TIPC_FWD_MSG 1 54 #define TIPC_MAX_PORT 0xffffffff 55 #define TIPC_MIN_PORT 1 56 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */ 57 58 enum { 59 TIPC_LISTEN = TCP_LISTEN, 60 TIPC_ESTABLISHED = TCP_ESTABLISHED, 61 TIPC_OPEN = TCP_CLOSE, 62 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 63 TIPC_CONNECTING = TCP_SYN_SENT, 64 }; 65 66 struct sockaddr_pair { 67 struct sockaddr_tipc sock; 68 struct sockaddr_tipc member; 69 }; 70 71 /** 72 * struct tipc_sock - TIPC socket structure 73 * @sk: socket - interacts with 'port' and with user via the socket API 74 * @conn_type: TIPC type used when connection was established 75 * @conn_instance: TIPC instance used when connection was established 76 * @published: non-zero if port has one or more associated names 77 * @max_pkt: maximum packet size "hint" used when building messages sent by port 78 * @maxnagle: maximum size of msg which can be subject to nagle 79 * @portid: unique port identity in TIPC socket hash table 80 * @phdr: preformatted message header used when sending messages 81 * #cong_links: list of congested links 82 * @publications: list of publications for port 83 * @blocking_link: address of the congested link we are currently sleeping on 84 * @pub_count: total # of publications port has made during its lifetime 85 * @conn_timeout: the time we can wait for an unresponded setup request 86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 87 * @cong_link_cnt: number of congested links 88 * @snt_unacked: # messages sent by socket, and not yet acked by peer 89 * @rcv_unacked: # messages read by user, but not yet acked back to peer 90 * @peer: 'connected' peer for dgram/rdm 91 * @node: hash table node 92 * @mc_method: cookie for use between socket and broadcast layer 93 * @rcu: rcu struct for tipc_sock 94 */ 95 struct tipc_sock { 96 struct sock sk; 97 u32 conn_type; 98 u32 conn_instance; 99 int published; 100 u32 max_pkt; 101 u32 maxnagle; 102 u32 portid; 103 struct tipc_msg phdr; 104 struct list_head cong_links; 105 struct list_head publications; 106 u32 pub_count; 107 atomic_t dupl_rcvcnt; 108 u16 conn_timeout; 109 bool probe_unacked; 110 u16 cong_link_cnt; 111 u16 snt_unacked; 112 u16 snd_win; 113 u16 peer_caps; 114 u16 rcv_unacked; 115 u16 rcv_win; 116 struct sockaddr_tipc peer; 117 struct rhash_head node; 118 struct tipc_mc_method mc_method; 119 struct rcu_head rcu; 120 struct tipc_group *group; 121 u32 oneway; 122 u16 snd_backlog; 123 bool expect_ack; 124 bool nodelay; 125 bool group_is_open; 126 }; 127 128 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 129 static void tipc_data_ready(struct sock *sk); 130 static void tipc_write_space(struct sock *sk); 131 static void tipc_sock_destruct(struct sock *sk); 132 static int tipc_release(struct socket *sock); 133 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 134 bool kern); 135 static void tipc_sk_timeout(struct timer_list *t); 136 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 137 struct tipc_name_seq const *seq); 138 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 139 struct tipc_name_seq const *seq); 140 static int tipc_sk_leave(struct tipc_sock *tsk); 141 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 142 static int tipc_sk_insert(struct tipc_sock *tsk); 143 static void tipc_sk_remove(struct tipc_sock *tsk); 144 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 145 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 146 static void tipc_sk_push_backlog(struct tipc_sock *tsk); 147 148 static const struct proto_ops packet_ops; 149 static const struct proto_ops stream_ops; 150 static const struct proto_ops msg_ops; 151 static struct proto tipc_proto; 152 static const struct rhashtable_params tsk_rht_params; 153 154 static u32 tsk_own_node(struct tipc_sock *tsk) 155 { 156 return msg_prevnode(&tsk->phdr); 157 } 158 159 static u32 tsk_peer_node(struct tipc_sock *tsk) 160 { 161 return msg_destnode(&tsk->phdr); 162 } 163 164 static u32 tsk_peer_port(struct tipc_sock *tsk) 165 { 166 return msg_destport(&tsk->phdr); 167 } 168 169 static bool tsk_unreliable(struct tipc_sock *tsk) 170 { 171 return msg_src_droppable(&tsk->phdr) != 0; 172 } 173 174 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 175 { 176 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 177 } 178 179 static bool tsk_unreturnable(struct tipc_sock *tsk) 180 { 181 return msg_dest_droppable(&tsk->phdr) != 0; 182 } 183 184 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 185 { 186 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 187 } 188 189 static int tsk_importance(struct tipc_sock *tsk) 190 { 191 return msg_importance(&tsk->phdr); 192 } 193 194 static int tsk_set_importance(struct tipc_sock *tsk, int imp) 195 { 196 if (imp > TIPC_CRITICAL_IMPORTANCE) 197 return -EINVAL; 198 msg_set_importance(&tsk->phdr, (u32)imp); 199 return 0; 200 } 201 202 static struct tipc_sock *tipc_sk(const struct sock *sk) 203 { 204 return container_of(sk, struct tipc_sock, sk); 205 } 206 207 static bool tsk_conn_cong(struct tipc_sock *tsk) 208 { 209 return tsk->snt_unacked > tsk->snd_win; 210 } 211 212 static u16 tsk_blocks(int len) 213 { 214 return ((len / FLOWCTL_BLK_SZ) + 1); 215 } 216 217 /* tsk_blocks(): translate a buffer size in bytes to number of 218 * advertisable blocks, taking into account the ratio truesize(len)/len 219 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 220 */ 221 static u16 tsk_adv_blocks(int len) 222 { 223 return len / FLOWCTL_BLK_SZ / 4; 224 } 225 226 /* tsk_inc(): increment counter for sent or received data 227 * - If block based flow control is not supported by peer we 228 * fall back to message based ditto, incrementing the counter 229 */ 230 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 231 { 232 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 233 return ((msglen / FLOWCTL_BLK_SZ) + 1); 234 return 1; 235 } 236 237 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 238 */ 239 static void tsk_set_nagle(struct tipc_sock *tsk) 240 { 241 struct sock *sk = &tsk->sk; 242 243 tsk->maxnagle = 0; 244 if (sk->sk_type != SOCK_STREAM) 245 return; 246 if (tsk->nodelay) 247 return; 248 if (!(tsk->peer_caps & TIPC_NAGLE)) 249 return; 250 /* Limit node local buffer size to avoid receive queue overflow */ 251 if (tsk->max_pkt == MAX_MSG_SIZE) 252 tsk->maxnagle = 1500; 253 else 254 tsk->maxnagle = tsk->max_pkt; 255 } 256 257 /** 258 * tsk_advance_rx_queue - discard first buffer in socket receive queue 259 * 260 * Caller must hold socket lock 261 */ 262 static void tsk_advance_rx_queue(struct sock *sk) 263 { 264 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 265 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 266 } 267 268 /* tipc_sk_respond() : send response message back to sender 269 */ 270 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 271 { 272 u32 selector; 273 u32 dnode; 274 u32 onode = tipc_own_addr(sock_net(sk)); 275 276 if (!tipc_msg_reverse(onode, &skb, err)) 277 return; 278 279 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 280 dnode = msg_destnode(buf_msg(skb)); 281 selector = msg_origport(buf_msg(skb)); 282 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 283 } 284 285 /** 286 * tsk_rej_rx_queue - reject all buffers in socket receive queue 287 * 288 * Caller must hold socket lock 289 */ 290 static void tsk_rej_rx_queue(struct sock *sk) 291 { 292 struct sk_buff *skb; 293 294 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 295 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT); 296 } 297 298 static bool tipc_sk_connected(struct sock *sk) 299 { 300 return sk->sk_state == TIPC_ESTABLISHED; 301 } 302 303 /* tipc_sk_type_connectionless - check if the socket is datagram socket 304 * @sk: socket 305 * 306 * Returns true if connection less, false otherwise 307 */ 308 static bool tipc_sk_type_connectionless(struct sock *sk) 309 { 310 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 311 } 312 313 /* tsk_peer_msg - verify if message was sent by connected port's peer 314 * 315 * Handles cases where the node's network address has changed from 316 * the default of <0.0.0> to its configured setting. 317 */ 318 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 319 { 320 struct sock *sk = &tsk->sk; 321 u32 self = tipc_own_addr(sock_net(sk)); 322 u32 peer_port = tsk_peer_port(tsk); 323 u32 orig_node, peer_node; 324 325 if (unlikely(!tipc_sk_connected(sk))) 326 return false; 327 328 if (unlikely(msg_origport(msg) != peer_port)) 329 return false; 330 331 orig_node = msg_orignode(msg); 332 peer_node = tsk_peer_node(tsk); 333 334 if (likely(orig_node == peer_node)) 335 return true; 336 337 if (!orig_node && peer_node == self) 338 return true; 339 340 if (!peer_node && orig_node == self) 341 return true; 342 343 return false; 344 } 345 346 /* tipc_set_sk_state - set the sk_state of the socket 347 * @sk: socket 348 * 349 * Caller must hold socket lock 350 * 351 * Returns 0 on success, errno otherwise 352 */ 353 static int tipc_set_sk_state(struct sock *sk, int state) 354 { 355 int oldsk_state = sk->sk_state; 356 int res = -EINVAL; 357 358 switch (state) { 359 case TIPC_OPEN: 360 res = 0; 361 break; 362 case TIPC_LISTEN: 363 case TIPC_CONNECTING: 364 if (oldsk_state == TIPC_OPEN) 365 res = 0; 366 break; 367 case TIPC_ESTABLISHED: 368 if (oldsk_state == TIPC_CONNECTING || 369 oldsk_state == TIPC_OPEN) 370 res = 0; 371 break; 372 case TIPC_DISCONNECTING: 373 if (oldsk_state == TIPC_CONNECTING || 374 oldsk_state == TIPC_ESTABLISHED) 375 res = 0; 376 break; 377 } 378 379 if (!res) 380 sk->sk_state = state; 381 382 return res; 383 } 384 385 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 386 { 387 struct sock *sk = sock->sk; 388 int err = sock_error(sk); 389 int typ = sock->type; 390 391 if (err) 392 return err; 393 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 394 if (sk->sk_state == TIPC_DISCONNECTING) 395 return -EPIPE; 396 else if (!tipc_sk_connected(sk)) 397 return -ENOTCONN; 398 } 399 if (!*timeout) 400 return -EAGAIN; 401 if (signal_pending(current)) 402 return sock_intr_errno(*timeout); 403 404 return 0; 405 } 406 407 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 408 ({ \ 409 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 410 struct sock *sk_; \ 411 int rc_; \ 412 \ 413 while ((rc_ = !(condition_))) { \ 414 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 415 smp_rmb(); \ 416 sk_ = (sock_)->sk; \ 417 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 418 if (rc_) \ 419 break; \ 420 add_wait_queue(sk_sleep(sk_), &wait_); \ 421 release_sock(sk_); \ 422 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 423 sched_annotate_sleep(); \ 424 lock_sock(sk_); \ 425 remove_wait_queue(sk_sleep(sk_), &wait_); \ 426 } \ 427 rc_; \ 428 }) 429 430 /** 431 * tipc_sk_create - create a TIPC socket 432 * @net: network namespace (must be default network) 433 * @sock: pre-allocated socket structure 434 * @protocol: protocol indicator (must be 0) 435 * @kern: caused by kernel or by userspace? 436 * 437 * This routine creates additional data structures used by the TIPC socket, 438 * initializes them, and links them together. 439 * 440 * Returns 0 on success, errno otherwise 441 */ 442 static int tipc_sk_create(struct net *net, struct socket *sock, 443 int protocol, int kern) 444 { 445 const struct proto_ops *ops; 446 struct sock *sk; 447 struct tipc_sock *tsk; 448 struct tipc_msg *msg; 449 450 /* Validate arguments */ 451 if (unlikely(protocol != 0)) 452 return -EPROTONOSUPPORT; 453 454 switch (sock->type) { 455 case SOCK_STREAM: 456 ops = &stream_ops; 457 break; 458 case SOCK_SEQPACKET: 459 ops = &packet_ops; 460 break; 461 case SOCK_DGRAM: 462 case SOCK_RDM: 463 ops = &msg_ops; 464 break; 465 default: 466 return -EPROTOTYPE; 467 } 468 469 /* Allocate socket's protocol area */ 470 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 471 if (sk == NULL) 472 return -ENOMEM; 473 474 tsk = tipc_sk(sk); 475 tsk->max_pkt = MAX_PKT_DEFAULT; 476 tsk->maxnagle = 0; 477 INIT_LIST_HEAD(&tsk->publications); 478 INIT_LIST_HEAD(&tsk->cong_links); 479 msg = &tsk->phdr; 480 481 /* Finish initializing socket data structures */ 482 sock->ops = ops; 483 sock_init_data(sock, sk); 484 tipc_set_sk_state(sk, TIPC_OPEN); 485 if (tipc_sk_insert(tsk)) { 486 pr_warn("Socket create failed; port number exhausted\n"); 487 return -EINVAL; 488 } 489 490 /* Ensure tsk is visible before we read own_addr. */ 491 smp_mb(); 492 493 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 494 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 495 496 msg_set_origport(msg, tsk->portid); 497 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 498 sk->sk_shutdown = 0; 499 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 500 sk->sk_rcvbuf = sysctl_tipc_rmem[1]; 501 sk->sk_data_ready = tipc_data_ready; 502 sk->sk_write_space = tipc_write_space; 503 sk->sk_destruct = tipc_sock_destruct; 504 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 505 tsk->group_is_open = true; 506 atomic_set(&tsk->dupl_rcvcnt, 0); 507 508 /* Start out with safe limits until we receive an advertised window */ 509 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 510 tsk->rcv_win = tsk->snd_win; 511 512 if (tipc_sk_type_connectionless(sk)) { 513 tsk_set_unreturnable(tsk, true); 514 if (sock->type == SOCK_DGRAM) 515 tsk_set_unreliable(tsk, true); 516 } 517 __skb_queue_head_init(&tsk->mc_method.deferredq); 518 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 519 return 0; 520 } 521 522 static void tipc_sk_callback(struct rcu_head *head) 523 { 524 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 525 526 sock_put(&tsk->sk); 527 } 528 529 /* Caller should hold socket lock for the socket. */ 530 static void __tipc_shutdown(struct socket *sock, int error) 531 { 532 struct sock *sk = sock->sk; 533 struct tipc_sock *tsk = tipc_sk(sk); 534 struct net *net = sock_net(sk); 535 long timeout = 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 /* Reject all unreceived messages, except on an active connection 549 * (which disconnects locally & sends a 'FIN+' to peer). 550 */ 551 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { 552 if (TIPC_SKB_CB(skb)->bytes_read) { 553 kfree_skb(skb); 554 continue; 555 } 556 if (!tipc_sk_type_connectionless(sk) && 557 sk->sk_state != TIPC_DISCONNECTING) { 558 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 559 tipc_node_remove_conn(net, dnode, tsk->portid); 560 } 561 tipc_sk_respond(sk, skb, error); 562 } 563 564 if (tipc_sk_type_connectionless(sk)) 565 return; 566 567 if (sk->sk_state != TIPC_DISCONNECTING) { 568 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 569 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 570 tsk_own_node(tsk), tsk_peer_port(tsk), 571 tsk->portid, error); 572 if (skb) 573 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 574 tipc_node_remove_conn(net, dnode, tsk->portid); 575 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 576 } 577 } 578 579 /** 580 * tipc_release - destroy a TIPC socket 581 * @sock: socket to destroy 582 * 583 * This routine cleans up any messages that are still queued on the socket. 584 * For DGRAM and RDM socket types, all queued messages are rejected. 585 * For SEQPACKET and STREAM socket types, the first message is rejected 586 * and any others are discarded. (If the first message on a STREAM socket 587 * is partially-read, it is discarded and the next one is rejected instead.) 588 * 589 * NOTE: Rejected messages are not necessarily returned to the sender! They 590 * are returned or discarded according to the "destination droppable" setting 591 * specified for the message by the sender. 592 * 593 * Returns 0 on success, errno otherwise 594 */ 595 static int tipc_release(struct socket *sock) 596 { 597 struct sock *sk = sock->sk; 598 struct tipc_sock *tsk; 599 600 /* 601 * Exit if socket isn't fully initialized (occurs when a failed accept() 602 * releases a pre-allocated child socket that was never used) 603 */ 604 if (sk == NULL) 605 return 0; 606 607 tsk = tipc_sk(sk); 608 lock_sock(sk); 609 610 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 611 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 612 sk->sk_shutdown = SHUTDOWN_MASK; 613 tipc_sk_leave(tsk); 614 tipc_sk_withdraw(tsk, 0, NULL); 615 __skb_queue_purge(&tsk->mc_method.deferredq); 616 sk_stop_timer(sk, &sk->sk_timer); 617 tipc_sk_remove(tsk); 618 619 sock_orphan(sk); 620 /* Reject any messages that accumulated in backlog queue */ 621 release_sock(sk); 622 tipc_dest_list_purge(&tsk->cong_links); 623 tsk->cong_link_cnt = 0; 624 call_rcu(&tsk->rcu, tipc_sk_callback); 625 sock->sk = NULL; 626 627 return 0; 628 } 629 630 /** 631 * tipc_bind - associate or disassocate TIPC name(s) with a socket 632 * @sock: socket structure 633 * @uaddr: socket address describing name(s) and desired operation 634 * @uaddr_len: size of socket address data structure 635 * 636 * Name and name sequence binding is indicated using a positive scope value; 637 * a negative scope value unbinds the specified name. Specifying no name 638 * (i.e. a socket address length of 0) unbinds all names from the socket. 639 * 640 * Returns 0 on success, errno otherwise 641 * 642 * NOTE: This routine doesn't need to take the socket lock since it doesn't 643 * access any non-constant socket information. 644 */ 645 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, 646 int uaddr_len) 647 { 648 struct sock *sk = sock->sk; 649 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 650 struct tipc_sock *tsk = tipc_sk(sk); 651 int res = -EINVAL; 652 653 lock_sock(sk); 654 if (unlikely(!uaddr_len)) { 655 res = tipc_sk_withdraw(tsk, 0, NULL); 656 goto exit; 657 } 658 if (tsk->group) { 659 res = -EACCES; 660 goto exit; 661 } 662 if (uaddr_len < sizeof(struct sockaddr_tipc)) { 663 res = -EINVAL; 664 goto exit; 665 } 666 if (addr->family != AF_TIPC) { 667 res = -EAFNOSUPPORT; 668 goto exit; 669 } 670 671 if (addr->addrtype == TIPC_ADDR_NAME) 672 addr->addr.nameseq.upper = addr->addr.nameseq.lower; 673 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { 674 res = -EAFNOSUPPORT; 675 goto exit; 676 } 677 678 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && 679 (addr->addr.nameseq.type != TIPC_TOP_SRV) && 680 (addr->addr.nameseq.type != TIPC_CFG_SRV)) { 681 res = -EACCES; 682 goto exit; 683 } 684 685 res = (addr->scope >= 0) ? 686 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) : 687 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq); 688 exit: 689 release_sock(sk); 690 return res; 691 } 692 693 /** 694 * tipc_getname - get port ID of socket or peer socket 695 * @sock: socket structure 696 * @uaddr: area for returned socket address 697 * @uaddr_len: area for returned length of socket address 698 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 699 * 700 * Returns 0 on success, errno otherwise 701 * 702 * NOTE: This routine doesn't need to take the socket lock since it only 703 * accesses socket information that is unchanging (or which changes in 704 * a completely predictable manner). 705 */ 706 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 707 int peer) 708 { 709 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 710 struct sock *sk = sock->sk; 711 struct tipc_sock *tsk = tipc_sk(sk); 712 713 memset(addr, 0, sizeof(*addr)); 714 if (peer) { 715 if ((!tipc_sk_connected(sk)) && 716 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 717 return -ENOTCONN; 718 addr->addr.id.ref = tsk_peer_port(tsk); 719 addr->addr.id.node = tsk_peer_node(tsk); 720 } else { 721 addr->addr.id.ref = tsk->portid; 722 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 723 } 724 725 addr->addrtype = TIPC_ADDR_ID; 726 addr->family = AF_TIPC; 727 addr->scope = 0; 728 addr->addr.name.domain = 0; 729 730 return sizeof(*addr); 731 } 732 733 /** 734 * tipc_poll - read and possibly block on pollmask 735 * @file: file structure associated with the socket 736 * @sock: socket for which to calculate the poll bits 737 * @wait: ??? 738 * 739 * Returns pollmask value 740 * 741 * COMMENTARY: 742 * It appears that the usual socket locking mechanisms are not useful here 743 * since the pollmask info is potentially out-of-date the moment this routine 744 * exits. TCP and other protocols seem to rely on higher level poll routines 745 * to handle any preventable race conditions, so TIPC will do the same ... 746 * 747 * IMPORTANT: The fact that a read or write operation is indicated does NOT 748 * imply that the operation will succeed, merely that it should be performed 749 * and will not block. 750 */ 751 static __poll_t tipc_poll(struct file *file, struct socket *sock, 752 poll_table *wait) 753 { 754 struct sock *sk = sock->sk; 755 struct tipc_sock *tsk = tipc_sk(sk); 756 __poll_t revents = 0; 757 758 sock_poll_wait(file, sock, wait); 759 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 760 761 if (sk->sk_shutdown & RCV_SHUTDOWN) 762 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 763 if (sk->sk_shutdown == SHUTDOWN_MASK) 764 revents |= EPOLLHUP; 765 766 switch (sk->sk_state) { 767 case TIPC_ESTABLISHED: 768 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 769 revents |= EPOLLOUT; 770 /* fall through */ 771 case TIPC_LISTEN: 772 case TIPC_CONNECTING: 773 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 774 revents |= EPOLLIN | EPOLLRDNORM; 775 break; 776 case TIPC_OPEN: 777 if (tsk->group_is_open && !tsk->cong_link_cnt) 778 revents |= EPOLLOUT; 779 if (!tipc_sk_type_connectionless(sk)) 780 break; 781 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 782 break; 783 revents |= EPOLLIN | EPOLLRDNORM; 784 break; 785 case TIPC_DISCONNECTING: 786 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 787 break; 788 } 789 return revents; 790 } 791 792 /** 793 * tipc_sendmcast - send multicast message 794 * @sock: socket structure 795 * @seq: destination address 796 * @msg: message to send 797 * @dlen: length of data to send 798 * @timeout: timeout to wait for wakeup 799 * 800 * Called from function tipc_sendmsg(), which has done all sanity checks 801 * Returns the number of bytes sent on success, or errno 802 */ 803 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, 804 struct msghdr *msg, size_t dlen, long timeout) 805 { 806 struct sock *sk = sock->sk; 807 struct tipc_sock *tsk = tipc_sk(sk); 808 struct tipc_msg *hdr = &tsk->phdr; 809 struct net *net = sock_net(sk); 810 int mtu = tipc_bcast_get_mtu(net); 811 struct tipc_mc_method *method = &tsk->mc_method; 812 struct sk_buff_head pkts; 813 struct tipc_nlist dsts; 814 int rc; 815 816 if (tsk->group) 817 return -EACCES; 818 819 /* Block or return if any destination link is congested */ 820 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 821 if (unlikely(rc)) 822 return rc; 823 824 /* Lookup destination nodes */ 825 tipc_nlist_init(&dsts, tipc_own_addr(net)); 826 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower, 827 seq->upper, &dsts); 828 if (!dsts.local && !dsts.remote) 829 return -EHOSTUNREACH; 830 831 /* Build message header */ 832 msg_set_type(hdr, TIPC_MCAST_MSG); 833 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 834 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 835 msg_set_destport(hdr, 0); 836 msg_set_destnode(hdr, 0); 837 msg_set_nametype(hdr, seq->type); 838 msg_set_namelower(hdr, seq->lower); 839 msg_set_nameupper(hdr, seq->upper); 840 841 /* Build message as chain of buffers */ 842 __skb_queue_head_init(&pkts); 843 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 844 845 /* Send message if build was successful */ 846 if (unlikely(rc == dlen)) { 847 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 848 TIPC_DUMP_SK_SNDQ, " "); 849 rc = tipc_mcast_xmit(net, &pkts, method, &dsts, 850 &tsk->cong_link_cnt); 851 } 852 853 tipc_nlist_purge(&dsts); 854 855 return rc ? rc : dlen; 856 } 857 858 /** 859 * tipc_send_group_msg - send a message to a member in the group 860 * @net: network namespace 861 * @m: message to send 862 * @mb: group member 863 * @dnode: destination node 864 * @dport: destination port 865 * @dlen: total length of message data 866 */ 867 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 868 struct msghdr *m, struct tipc_member *mb, 869 u32 dnode, u32 dport, int dlen) 870 { 871 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 872 struct tipc_mc_method *method = &tsk->mc_method; 873 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 874 struct tipc_msg *hdr = &tsk->phdr; 875 struct sk_buff_head pkts; 876 int mtu, rc; 877 878 /* Complete message header */ 879 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 880 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 881 msg_set_destport(hdr, dport); 882 msg_set_destnode(hdr, dnode); 883 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 884 885 /* Build message as chain of buffers */ 886 __skb_queue_head_init(&pkts); 887 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 888 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 889 if (unlikely(rc != dlen)) 890 return rc; 891 892 /* Send message */ 893 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 894 if (unlikely(rc == -ELINKCONG)) { 895 tipc_dest_push(&tsk->cong_links, dnode, 0); 896 tsk->cong_link_cnt++; 897 } 898 899 /* Update send window */ 900 tipc_group_update_member(mb, blks); 901 902 /* A broadcast sent within next EXPIRE period must follow same path */ 903 method->rcast = true; 904 method->mandatory = true; 905 return dlen; 906 } 907 908 /** 909 * tipc_send_group_unicast - send message to a member in the group 910 * @sock: socket structure 911 * @m: message to send 912 * @dlen: total length of message data 913 * @timeout: timeout to wait for wakeup 914 * 915 * Called from function tipc_sendmsg(), which has done all sanity checks 916 * Returns the number of bytes sent on success, or errno 917 */ 918 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 919 int dlen, long timeout) 920 { 921 struct sock *sk = sock->sk; 922 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 923 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 924 struct tipc_sock *tsk = tipc_sk(sk); 925 struct net *net = sock_net(sk); 926 struct tipc_member *mb = NULL; 927 u32 node, port; 928 int rc; 929 930 node = dest->addr.id.node; 931 port = dest->addr.id.ref; 932 if (!port && !node) 933 return -EHOSTUNREACH; 934 935 /* Block or return if destination link or member is congested */ 936 rc = tipc_wait_for_cond(sock, &timeout, 937 !tipc_dest_find(&tsk->cong_links, node, 0) && 938 tsk->group && 939 !tipc_group_cong(tsk->group, node, port, blks, 940 &mb)); 941 if (unlikely(rc)) 942 return rc; 943 944 if (unlikely(!mb)) 945 return -EHOSTUNREACH; 946 947 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 948 949 return rc ? rc : dlen; 950 } 951 952 /** 953 * tipc_send_group_anycast - send message to any member with given identity 954 * @sock: socket structure 955 * @m: message to send 956 * @dlen: total length of message data 957 * @timeout: timeout to wait for wakeup 958 * 959 * Called from function tipc_sendmsg(), which has done all sanity checks 960 * Returns the number of bytes sent on success, or errno 961 */ 962 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 963 int dlen, long timeout) 964 { 965 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 966 struct sock *sk = sock->sk; 967 struct tipc_sock *tsk = tipc_sk(sk); 968 struct list_head *cong_links = &tsk->cong_links; 969 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 970 struct tipc_msg *hdr = &tsk->phdr; 971 struct tipc_member *first = NULL; 972 struct tipc_member *mbr = NULL; 973 struct net *net = sock_net(sk); 974 u32 node, port, exclude; 975 struct list_head dsts; 976 u32 type, inst, scope; 977 int lookups = 0; 978 int dstcnt, rc; 979 bool cong; 980 981 INIT_LIST_HEAD(&dsts); 982 983 type = msg_nametype(hdr); 984 inst = dest->addr.name.name.instance; 985 scope = msg_lookup_scope(hdr); 986 987 while (++lookups < 4) { 988 exclude = tipc_group_exclude(tsk->group); 989 990 first = NULL; 991 992 /* Look for a non-congested destination member, if any */ 993 while (1) { 994 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 995 &dstcnt, exclude, false)) 996 return -EHOSTUNREACH; 997 tipc_dest_pop(&dsts, &node, &port); 998 cong = tipc_group_cong(tsk->group, node, port, blks, 999 &mbr); 1000 if (!cong) 1001 break; 1002 if (mbr == first) 1003 break; 1004 if (!first) 1005 first = mbr; 1006 } 1007 1008 /* Start over if destination was not in member list */ 1009 if (unlikely(!mbr)) 1010 continue; 1011 1012 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1013 break; 1014 1015 /* Block or return if destination link or member is congested */ 1016 rc = tipc_wait_for_cond(sock, &timeout, 1017 !tipc_dest_find(cong_links, node, 0) && 1018 tsk->group && 1019 !tipc_group_cong(tsk->group, node, port, 1020 blks, &mbr)); 1021 if (unlikely(rc)) 1022 return rc; 1023 1024 /* Send, unless destination disappeared while waiting */ 1025 if (likely(mbr)) 1026 break; 1027 } 1028 1029 if (unlikely(lookups >= 4)) 1030 return -EHOSTUNREACH; 1031 1032 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1033 1034 return rc ? rc : dlen; 1035 } 1036 1037 /** 1038 * tipc_send_group_bcast - send message to all members in communication group 1039 * @sk: socket structure 1040 * @m: message to send 1041 * @dlen: total length of message data 1042 * @timeout: timeout to wait for wakeup 1043 * 1044 * Called from function tipc_sendmsg(), which has done all sanity checks 1045 * Returns the number of bytes sent on success, or errno 1046 */ 1047 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1048 int dlen, long timeout) 1049 { 1050 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1051 struct sock *sk = sock->sk; 1052 struct net *net = sock_net(sk); 1053 struct tipc_sock *tsk = tipc_sk(sk); 1054 struct tipc_nlist *dsts; 1055 struct tipc_mc_method *method = &tsk->mc_method; 1056 bool ack = method->mandatory && method->rcast; 1057 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1058 struct tipc_msg *hdr = &tsk->phdr; 1059 int mtu = tipc_bcast_get_mtu(net); 1060 struct sk_buff_head pkts; 1061 int rc = -EHOSTUNREACH; 1062 1063 /* Block or return if any destination link or member is congested */ 1064 rc = tipc_wait_for_cond(sock, &timeout, 1065 !tsk->cong_link_cnt && tsk->group && 1066 !tipc_group_bc_cong(tsk->group, blks)); 1067 if (unlikely(rc)) 1068 return rc; 1069 1070 dsts = tipc_group_dests(tsk->group); 1071 if (!dsts->local && !dsts->remote) 1072 return -EHOSTUNREACH; 1073 1074 /* Complete message header */ 1075 if (dest) { 1076 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1077 msg_set_nameinst(hdr, dest->addr.name.name.instance); 1078 } else { 1079 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1080 msg_set_nameinst(hdr, 0); 1081 } 1082 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1083 msg_set_destport(hdr, 0); 1084 msg_set_destnode(hdr, 0); 1085 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1086 1087 /* Avoid getting stuck with repeated forced replicasts */ 1088 msg_set_grp_bc_ack_req(hdr, ack); 1089 1090 /* Build message as chain of buffers */ 1091 __skb_queue_head_init(&pkts); 1092 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1093 if (unlikely(rc != dlen)) 1094 return rc; 1095 1096 /* Send message */ 1097 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1098 if (unlikely(rc)) 1099 return rc; 1100 1101 /* Update broadcast sequence number and send windows */ 1102 tipc_group_update_bc_members(tsk->group, blks, ack); 1103 1104 /* Broadcast link is now free to choose method for next broadcast */ 1105 method->mandatory = false; 1106 method->expires = jiffies; 1107 1108 return dlen; 1109 } 1110 1111 /** 1112 * tipc_send_group_mcast - send message to all members with given identity 1113 * @sock: socket structure 1114 * @m: message to send 1115 * @dlen: total length of message data 1116 * @timeout: timeout to wait for wakeup 1117 * 1118 * Called from function tipc_sendmsg(), which has done all sanity checks 1119 * Returns the number of bytes sent on success, or errno 1120 */ 1121 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1122 int dlen, long timeout) 1123 { 1124 struct sock *sk = sock->sk; 1125 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1126 struct tipc_sock *tsk = tipc_sk(sk); 1127 struct tipc_group *grp = tsk->group; 1128 struct tipc_msg *hdr = &tsk->phdr; 1129 struct net *net = sock_net(sk); 1130 u32 type, inst, scope, exclude; 1131 struct list_head dsts; 1132 u32 dstcnt; 1133 1134 INIT_LIST_HEAD(&dsts); 1135 1136 type = msg_nametype(hdr); 1137 inst = dest->addr.name.name.instance; 1138 scope = msg_lookup_scope(hdr); 1139 exclude = tipc_group_exclude(grp); 1140 1141 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 1142 &dstcnt, exclude, true)) 1143 return -EHOSTUNREACH; 1144 1145 if (dstcnt == 1) { 1146 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref); 1147 return tipc_send_group_unicast(sock, m, dlen, timeout); 1148 } 1149 1150 tipc_dest_list_purge(&dsts); 1151 return tipc_send_group_bcast(sock, m, dlen, timeout); 1152 } 1153 1154 /** 1155 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1156 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1157 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1158 * 1159 * Multi-threaded: parallel calls with reference to same queues may occur 1160 */ 1161 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1162 struct sk_buff_head *inputq) 1163 { 1164 u32 self = tipc_own_addr(net); 1165 u32 type, lower, upper, scope; 1166 struct sk_buff *skb, *_skb; 1167 u32 portid, onode; 1168 struct sk_buff_head tmpq; 1169 struct list_head dports; 1170 struct tipc_msg *hdr; 1171 int user, mtyp, hlen; 1172 bool exact; 1173 1174 __skb_queue_head_init(&tmpq); 1175 INIT_LIST_HEAD(&dports); 1176 1177 skb = tipc_skb_peek(arrvq, &inputq->lock); 1178 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1179 hdr = buf_msg(skb); 1180 user = msg_user(hdr); 1181 mtyp = msg_type(hdr); 1182 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1183 onode = msg_orignode(hdr); 1184 type = msg_nametype(hdr); 1185 1186 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1187 spin_lock_bh(&inputq->lock); 1188 if (skb_peek(arrvq) == skb) { 1189 __skb_dequeue(arrvq); 1190 __skb_queue_tail(inputq, skb); 1191 } 1192 kfree_skb(skb); 1193 spin_unlock_bh(&inputq->lock); 1194 continue; 1195 } 1196 1197 /* Group messages require exact scope match */ 1198 if (msg_in_group(hdr)) { 1199 lower = 0; 1200 upper = ~0; 1201 scope = msg_lookup_scope(hdr); 1202 exact = true; 1203 } else { 1204 /* TIPC_NODE_SCOPE means "any scope" in this context */ 1205 if (onode == self) 1206 scope = TIPC_NODE_SCOPE; 1207 else 1208 scope = TIPC_CLUSTER_SCOPE; 1209 exact = false; 1210 lower = msg_namelower(hdr); 1211 upper = msg_nameupper(hdr); 1212 } 1213 1214 /* Create destination port list: */ 1215 tipc_nametbl_mc_lookup(net, type, lower, upper, 1216 scope, exact, &dports); 1217 1218 /* Clone message per destination */ 1219 while (tipc_dest_pop(&dports, NULL, &portid)) { 1220 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1221 if (_skb) { 1222 msg_set_destport(buf_msg(_skb), portid); 1223 __skb_queue_tail(&tmpq, _skb); 1224 continue; 1225 } 1226 pr_warn("Failed to clone mcast rcv buffer\n"); 1227 } 1228 /* Append to inputq if not already done by other thread */ 1229 spin_lock_bh(&inputq->lock); 1230 if (skb_peek(arrvq) == skb) { 1231 skb_queue_splice_tail_init(&tmpq, inputq); 1232 kfree_skb(__skb_dequeue(arrvq)); 1233 } 1234 spin_unlock_bh(&inputq->lock); 1235 __skb_queue_purge(&tmpq); 1236 kfree_skb(skb); 1237 } 1238 tipc_sk_rcv(net, inputq); 1239 } 1240 1241 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1242 * when socket is in Nagle mode 1243 */ 1244 static void tipc_sk_push_backlog(struct tipc_sock *tsk) 1245 { 1246 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1247 struct net *net = sock_net(&tsk->sk); 1248 u32 dnode = tsk_peer_node(tsk); 1249 struct sk_buff *skb = skb_peek(txq); 1250 int rc; 1251 1252 if (!skb || tsk->cong_link_cnt) 1253 return; 1254 1255 /* Do not send SYN again after congestion */ 1256 if (msg_is_syn(buf_msg(skb))) 1257 return; 1258 1259 tsk->snt_unacked += tsk->snd_backlog; 1260 tsk->snd_backlog = 0; 1261 tsk->expect_ack = true; 1262 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1263 if (rc == -ELINKCONG) 1264 tsk->cong_link_cnt = 1; 1265 } 1266 1267 /** 1268 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1269 * @tsk: receiving socket 1270 * @skb: pointer to message buffer. 1271 */ 1272 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1273 struct sk_buff_head *inputq, 1274 struct sk_buff_head *xmitq) 1275 { 1276 struct tipc_msg *hdr = buf_msg(skb); 1277 u32 onode = tsk_own_node(tsk); 1278 struct sock *sk = &tsk->sk; 1279 int mtyp = msg_type(hdr); 1280 bool was_cong; 1281 1282 /* Ignore if connection cannot be validated: */ 1283 if (!tsk_peer_msg(tsk, hdr)) { 1284 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1285 goto exit; 1286 } 1287 1288 if (unlikely(msg_errcode(hdr))) { 1289 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1290 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1291 tsk_peer_port(tsk)); 1292 sk->sk_state_change(sk); 1293 1294 /* State change is ignored if socket already awake, 1295 * - convert msg to abort msg and add to inqueue 1296 */ 1297 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1298 msg_set_type(hdr, TIPC_CONN_MSG); 1299 msg_set_size(hdr, BASIC_H_SIZE); 1300 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1301 __skb_queue_tail(inputq, skb); 1302 return; 1303 } 1304 1305 tsk->probe_unacked = false; 1306 1307 if (mtyp == CONN_PROBE) { 1308 msg_set_type(hdr, CONN_PROBE_REPLY); 1309 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1310 __skb_queue_tail(xmitq, skb); 1311 return; 1312 } else if (mtyp == CONN_ACK) { 1313 was_cong = tsk_conn_cong(tsk); 1314 tsk->expect_ack = false; 1315 tipc_sk_push_backlog(tsk); 1316 tsk->snt_unacked -= msg_conn_ack(hdr); 1317 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1318 tsk->snd_win = msg_adv_win(hdr); 1319 if (was_cong && !tsk_conn_cong(tsk)) 1320 sk->sk_write_space(sk); 1321 } else if (mtyp != CONN_PROBE_REPLY) { 1322 pr_warn("Received unknown CONN_PROTO msg\n"); 1323 } 1324 exit: 1325 kfree_skb(skb); 1326 } 1327 1328 /** 1329 * tipc_sendmsg - send message in connectionless manner 1330 * @sock: socket structure 1331 * @m: message to send 1332 * @dsz: amount of user data to be sent 1333 * 1334 * Message must have an destination specified explicitly. 1335 * Used for SOCK_RDM and SOCK_DGRAM messages, 1336 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1337 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1338 * 1339 * Returns the number of bytes sent on success, or errno otherwise 1340 */ 1341 static int tipc_sendmsg(struct socket *sock, 1342 struct msghdr *m, size_t dsz) 1343 { 1344 struct sock *sk = sock->sk; 1345 int ret; 1346 1347 lock_sock(sk); 1348 ret = __tipc_sendmsg(sock, m, dsz); 1349 release_sock(sk); 1350 1351 return ret; 1352 } 1353 1354 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1355 { 1356 struct sock *sk = sock->sk; 1357 struct net *net = sock_net(sk); 1358 struct tipc_sock *tsk = tipc_sk(sk); 1359 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1360 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1361 struct list_head *clinks = &tsk->cong_links; 1362 bool syn = !tipc_sk_type_connectionless(sk); 1363 struct tipc_group *grp = tsk->group; 1364 struct tipc_msg *hdr = &tsk->phdr; 1365 struct tipc_name_seq *seq; 1366 struct sk_buff_head pkts; 1367 u32 dport = 0, dnode = 0; 1368 u32 type = 0, inst = 0; 1369 int mtu, rc; 1370 1371 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1372 return -EMSGSIZE; 1373 1374 if (likely(dest)) { 1375 if (unlikely(m->msg_namelen < sizeof(*dest))) 1376 return -EINVAL; 1377 if (unlikely(dest->family != AF_TIPC)) 1378 return -EINVAL; 1379 } 1380 1381 if (grp) { 1382 if (!dest) 1383 return tipc_send_group_bcast(sock, m, dlen, timeout); 1384 if (dest->addrtype == TIPC_ADDR_NAME) 1385 return tipc_send_group_anycast(sock, m, dlen, timeout); 1386 if (dest->addrtype == TIPC_ADDR_ID) 1387 return tipc_send_group_unicast(sock, m, dlen, timeout); 1388 if (dest->addrtype == TIPC_ADDR_MCAST) 1389 return tipc_send_group_mcast(sock, m, dlen, timeout); 1390 return -EINVAL; 1391 } 1392 1393 if (unlikely(!dest)) { 1394 dest = &tsk->peer; 1395 if (!syn && dest->family != AF_TIPC) 1396 return -EDESTADDRREQ; 1397 } 1398 1399 if (unlikely(syn)) { 1400 if (sk->sk_state == TIPC_LISTEN) 1401 return -EPIPE; 1402 if (sk->sk_state != TIPC_OPEN) 1403 return -EISCONN; 1404 if (tsk->published) 1405 return -EOPNOTSUPP; 1406 if (dest->addrtype == TIPC_ADDR_NAME) { 1407 tsk->conn_type = dest->addr.name.name.type; 1408 tsk->conn_instance = dest->addr.name.name.instance; 1409 } 1410 msg_set_syn(hdr, 1); 1411 } 1412 1413 seq = &dest->addr.nameseq; 1414 if (dest->addrtype == TIPC_ADDR_MCAST) 1415 return tipc_sendmcast(sock, seq, m, dlen, timeout); 1416 1417 if (dest->addrtype == TIPC_ADDR_NAME) { 1418 type = dest->addr.name.name.type; 1419 inst = dest->addr.name.name.instance; 1420 dnode = dest->addr.name.domain; 1421 dport = tipc_nametbl_translate(net, type, inst, &dnode); 1422 if (unlikely(!dport && !dnode)) 1423 return -EHOSTUNREACH; 1424 } else if (dest->addrtype == TIPC_ADDR_ID) { 1425 dnode = dest->addr.id.node; 1426 } else { 1427 return -EINVAL; 1428 } 1429 1430 /* Block or return if destination link is congested */ 1431 rc = tipc_wait_for_cond(sock, &timeout, 1432 !tipc_dest_find(clinks, dnode, 0)); 1433 if (unlikely(rc)) 1434 return rc; 1435 1436 if (dest->addrtype == TIPC_ADDR_NAME) { 1437 msg_set_type(hdr, TIPC_NAMED_MSG); 1438 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1439 msg_set_nametype(hdr, type); 1440 msg_set_nameinst(hdr, inst); 1441 msg_set_lookup_scope(hdr, tipc_node2scope(dnode)); 1442 msg_set_destnode(hdr, dnode); 1443 msg_set_destport(hdr, dport); 1444 } else { /* TIPC_ADDR_ID */ 1445 msg_set_type(hdr, TIPC_DIRECT_MSG); 1446 msg_set_lookup_scope(hdr, 0); 1447 msg_set_destnode(hdr, dnode); 1448 msg_set_destport(hdr, dest->addr.id.ref); 1449 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1450 } 1451 1452 __skb_queue_head_init(&pkts); 1453 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 1454 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1455 if (unlikely(rc != dlen)) 1456 return rc; 1457 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1458 __skb_queue_purge(&pkts); 1459 return -ENOMEM; 1460 } 1461 1462 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1463 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 1464 if (unlikely(rc == -ELINKCONG)) { 1465 tipc_dest_push(clinks, dnode, 0); 1466 tsk->cong_link_cnt++; 1467 rc = 0; 1468 } 1469 1470 if (unlikely(syn && !rc)) 1471 tipc_set_sk_state(sk, TIPC_CONNECTING); 1472 1473 return rc ? rc : dlen; 1474 } 1475 1476 /** 1477 * tipc_sendstream - send stream-oriented data 1478 * @sock: socket structure 1479 * @m: data to send 1480 * @dsz: total length of data to be transmitted 1481 * 1482 * Used for SOCK_STREAM data. 1483 * 1484 * Returns the number of bytes sent on success (or partial success), 1485 * or errno if no data sent 1486 */ 1487 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1488 { 1489 struct sock *sk = sock->sk; 1490 int ret; 1491 1492 lock_sock(sk); 1493 ret = __tipc_sendstream(sock, m, dsz); 1494 release_sock(sk); 1495 1496 return ret; 1497 } 1498 1499 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1500 { 1501 struct sock *sk = sock->sk; 1502 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1503 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1504 struct sk_buff_head *txq = &sk->sk_write_queue; 1505 struct tipc_sock *tsk = tipc_sk(sk); 1506 struct tipc_msg *hdr = &tsk->phdr; 1507 struct net *net = sock_net(sk); 1508 u32 dnode = tsk_peer_node(tsk); 1509 int maxnagle = tsk->maxnagle; 1510 int maxpkt = tsk->max_pkt; 1511 int send, sent = 0; 1512 int blocks, rc = 0; 1513 1514 if (unlikely(dlen > INT_MAX)) 1515 return -EMSGSIZE; 1516 1517 /* Handle implicit connection setup */ 1518 if (unlikely(dest)) { 1519 rc = __tipc_sendmsg(sock, m, dlen); 1520 if (dlen && dlen == rc) { 1521 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1522 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1523 } 1524 return rc; 1525 } 1526 1527 do { 1528 rc = tipc_wait_for_cond(sock, &timeout, 1529 (!tsk->cong_link_cnt && 1530 !tsk_conn_cong(tsk) && 1531 tipc_sk_connected(sk))); 1532 if (unlikely(rc)) 1533 break; 1534 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1535 blocks = tsk->snd_backlog; 1536 if (tsk->oneway++ >= 4 && send <= maxnagle) { 1537 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1538 if (unlikely(rc < 0)) 1539 break; 1540 blocks += rc; 1541 if (blocks <= 64 && tsk->expect_ack) { 1542 tsk->snd_backlog = blocks; 1543 sent += send; 1544 break; 1545 } 1546 tsk->expect_ack = true; 1547 } else { 1548 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1549 if (unlikely(rc != send)) 1550 break; 1551 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1552 } 1553 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1554 TIPC_DUMP_SK_SNDQ, " "); 1555 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1556 if (unlikely(rc == -ELINKCONG)) { 1557 tsk->cong_link_cnt = 1; 1558 rc = 0; 1559 } 1560 if (likely(!rc)) { 1561 tsk->snt_unacked += blocks; 1562 tsk->snd_backlog = 0; 1563 sent += send; 1564 } 1565 } while (sent < dlen && !rc); 1566 1567 return sent ? sent : rc; 1568 } 1569 1570 /** 1571 * tipc_send_packet - send a connection-oriented message 1572 * @sock: socket structure 1573 * @m: message to send 1574 * @dsz: length of data to be transmitted 1575 * 1576 * Used for SOCK_SEQPACKET messages. 1577 * 1578 * Returns the number of bytes sent on success, or errno otherwise 1579 */ 1580 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1581 { 1582 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1583 return -EMSGSIZE; 1584 1585 return tipc_sendstream(sock, m, dsz); 1586 } 1587 1588 /* tipc_sk_finish_conn - complete the setup of a connection 1589 */ 1590 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1591 u32 peer_node) 1592 { 1593 struct sock *sk = &tsk->sk; 1594 struct net *net = sock_net(sk); 1595 struct tipc_msg *msg = &tsk->phdr; 1596 1597 msg_set_syn(msg, 0); 1598 msg_set_destnode(msg, peer_node); 1599 msg_set_destport(msg, peer_port); 1600 msg_set_type(msg, TIPC_CONN_MSG); 1601 msg_set_lookup_scope(msg, 0); 1602 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1603 1604 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1605 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1606 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1607 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1608 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1609 tsk_set_nagle(tsk); 1610 __skb_queue_purge(&sk->sk_write_queue); 1611 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1612 return; 1613 1614 /* Fall back to message based flow control */ 1615 tsk->rcv_win = FLOWCTL_MSG_WIN; 1616 tsk->snd_win = FLOWCTL_MSG_WIN; 1617 } 1618 1619 /** 1620 * tipc_sk_set_orig_addr - capture sender's address for received message 1621 * @m: descriptor for message info 1622 * @hdr: received message header 1623 * 1624 * Note: Address is not captured if not requested by receiver. 1625 */ 1626 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1627 { 1628 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1629 struct tipc_msg *hdr = buf_msg(skb); 1630 1631 if (!srcaddr) 1632 return; 1633 1634 srcaddr->sock.family = AF_TIPC; 1635 srcaddr->sock.addrtype = TIPC_ADDR_ID; 1636 srcaddr->sock.scope = 0; 1637 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1638 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1639 srcaddr->sock.addr.name.domain = 0; 1640 m->msg_namelen = sizeof(struct sockaddr_tipc); 1641 1642 if (!msg_in_group(hdr)) 1643 return; 1644 1645 /* Group message users may also want to know sending member's id */ 1646 srcaddr->member.family = AF_TIPC; 1647 srcaddr->member.addrtype = TIPC_ADDR_NAME; 1648 srcaddr->member.scope = 0; 1649 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1650 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1651 srcaddr->member.addr.name.domain = 0; 1652 m->msg_namelen = sizeof(*srcaddr); 1653 } 1654 1655 /** 1656 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1657 * @m: descriptor for message info 1658 * @skb: received message buffer 1659 * @tsk: TIPC port associated with message 1660 * 1661 * Note: Ancillary data is not captured if not requested by receiver. 1662 * 1663 * Returns 0 if successful, otherwise errno 1664 */ 1665 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1666 struct tipc_sock *tsk) 1667 { 1668 struct tipc_msg *msg; 1669 u32 anc_data[3]; 1670 u32 err; 1671 u32 dest_type; 1672 int has_name; 1673 int res; 1674 1675 if (likely(m->msg_controllen == 0)) 1676 return 0; 1677 msg = buf_msg(skb); 1678 1679 /* Optionally capture errored message object(s) */ 1680 err = msg ? msg_errcode(msg) : 0; 1681 if (unlikely(err)) { 1682 anc_data[0] = err; 1683 anc_data[1] = msg_data_sz(msg); 1684 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); 1685 if (res) 1686 return res; 1687 if (anc_data[1]) { 1688 if (skb_linearize(skb)) 1689 return -ENOMEM; 1690 msg = buf_msg(skb); 1691 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], 1692 msg_data(msg)); 1693 if (res) 1694 return res; 1695 } 1696 } 1697 1698 /* Optionally capture message destination object */ 1699 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 1700 switch (dest_type) { 1701 case TIPC_NAMED_MSG: 1702 has_name = 1; 1703 anc_data[0] = msg_nametype(msg); 1704 anc_data[1] = msg_namelower(msg); 1705 anc_data[2] = msg_namelower(msg); 1706 break; 1707 case TIPC_MCAST_MSG: 1708 has_name = 1; 1709 anc_data[0] = msg_nametype(msg); 1710 anc_data[1] = msg_namelower(msg); 1711 anc_data[2] = msg_nameupper(msg); 1712 break; 1713 case TIPC_CONN_MSG: 1714 has_name = (tsk->conn_type != 0); 1715 anc_data[0] = tsk->conn_type; 1716 anc_data[1] = tsk->conn_instance; 1717 anc_data[2] = tsk->conn_instance; 1718 break; 1719 default: 1720 has_name = 0; 1721 } 1722 if (has_name) { 1723 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); 1724 if (res) 1725 return res; 1726 } 1727 1728 return 0; 1729 } 1730 1731 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1732 { 1733 struct sock *sk = &tsk->sk; 1734 struct net *net = sock_net(sk); 1735 struct sk_buff *skb = NULL; 1736 struct tipc_msg *msg; 1737 u32 peer_port = tsk_peer_port(tsk); 1738 u32 dnode = tsk_peer_node(tsk); 1739 1740 if (!tipc_sk_connected(sk)) 1741 return; 1742 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1743 dnode, tsk_own_node(tsk), peer_port, 1744 tsk->portid, TIPC_OK); 1745 if (!skb) 1746 return; 1747 msg = buf_msg(skb); 1748 msg_set_conn_ack(msg, tsk->rcv_unacked); 1749 tsk->rcv_unacked = 0; 1750 1751 /* Adjust to and advertize the correct window limit */ 1752 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1753 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1754 msg_set_adv_win(msg, tsk->rcv_win); 1755 } 1756 tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg)); 1757 } 1758 1759 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1760 { 1761 struct sock *sk = sock->sk; 1762 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1763 long timeo = *timeop; 1764 int err = sock_error(sk); 1765 1766 if (err) 1767 return err; 1768 1769 for (;;) { 1770 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1771 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1772 err = -ENOTCONN; 1773 break; 1774 } 1775 add_wait_queue(sk_sleep(sk), &wait); 1776 release_sock(sk); 1777 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1778 sched_annotate_sleep(); 1779 lock_sock(sk); 1780 remove_wait_queue(sk_sleep(sk), &wait); 1781 } 1782 err = 0; 1783 if (!skb_queue_empty(&sk->sk_receive_queue)) 1784 break; 1785 err = -EAGAIN; 1786 if (!timeo) 1787 break; 1788 err = sock_intr_errno(timeo); 1789 if (signal_pending(current)) 1790 break; 1791 1792 err = sock_error(sk); 1793 if (err) 1794 break; 1795 } 1796 *timeop = timeo; 1797 return err; 1798 } 1799 1800 /** 1801 * tipc_recvmsg - receive packet-oriented message 1802 * @m: descriptor for message info 1803 * @buflen: length of user buffer area 1804 * @flags: receive flags 1805 * 1806 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1807 * If the complete message doesn't fit in user area, truncate it. 1808 * 1809 * Returns size of returned message data, errno otherwise 1810 */ 1811 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1812 size_t buflen, int flags) 1813 { 1814 struct sock *sk = sock->sk; 1815 bool connected = !tipc_sk_type_connectionless(sk); 1816 struct tipc_sock *tsk = tipc_sk(sk); 1817 int rc, err, hlen, dlen, copy; 1818 struct sk_buff_head xmitq; 1819 struct tipc_msg *hdr; 1820 struct sk_buff *skb; 1821 bool grp_evt; 1822 long timeout; 1823 1824 /* Catch invalid receive requests */ 1825 if (unlikely(!buflen)) 1826 return -EINVAL; 1827 1828 lock_sock(sk); 1829 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1830 rc = -ENOTCONN; 1831 goto exit; 1832 } 1833 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1834 1835 /* Step rcv queue to first msg with data or error; wait if necessary */ 1836 do { 1837 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1838 if (unlikely(rc)) 1839 goto exit; 1840 skb = skb_peek(&sk->sk_receive_queue); 1841 hdr = buf_msg(skb); 1842 dlen = msg_data_sz(hdr); 1843 hlen = msg_hdr_sz(hdr); 1844 err = msg_errcode(hdr); 1845 grp_evt = msg_is_grp_evt(hdr); 1846 if (likely(dlen || err)) 1847 break; 1848 tsk_advance_rx_queue(sk); 1849 } while (1); 1850 1851 /* Collect msg meta data, including error code and rejected data */ 1852 tipc_sk_set_orig_addr(m, skb); 1853 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1854 if (unlikely(rc)) 1855 goto exit; 1856 hdr = buf_msg(skb); 1857 1858 /* Capture data if non-error msg, otherwise just set return value */ 1859 if (likely(!err)) { 1860 copy = min_t(int, dlen, buflen); 1861 if (unlikely(copy != dlen)) 1862 m->msg_flags |= MSG_TRUNC; 1863 rc = skb_copy_datagram_msg(skb, hlen, m, copy); 1864 } else { 1865 copy = 0; 1866 rc = 0; 1867 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) 1868 rc = -ECONNRESET; 1869 } 1870 if (unlikely(rc)) 1871 goto exit; 1872 1873 /* Mark message as group event if applicable */ 1874 if (unlikely(grp_evt)) { 1875 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1876 m->msg_flags |= MSG_EOR; 1877 m->msg_flags |= MSG_OOB; 1878 copy = 0; 1879 } 1880 1881 /* Caption of data or error code/rejected data was successful */ 1882 if (unlikely(flags & MSG_PEEK)) 1883 goto exit; 1884 1885 /* Send group flow control advertisement when applicable */ 1886 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1887 __skb_queue_head_init(&xmitq); 1888 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1889 msg_orignode(hdr), msg_origport(hdr), 1890 &xmitq); 1891 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1892 } 1893 1894 tsk_advance_rx_queue(sk); 1895 1896 if (likely(!connected)) 1897 goto exit; 1898 1899 /* Send connection flow control advertisement when applicable */ 1900 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1901 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1902 tipc_sk_send_ack(tsk); 1903 exit: 1904 release_sock(sk); 1905 return rc ? rc : copy; 1906 } 1907 1908 /** 1909 * tipc_recvstream - receive stream-oriented data 1910 * @m: descriptor for message info 1911 * @buflen: total size of user buffer area 1912 * @flags: receive flags 1913 * 1914 * Used for SOCK_STREAM messages only. If not enough data is available 1915 * will optionally wait for more; never truncates data. 1916 * 1917 * Returns size of returned message data, errno otherwise 1918 */ 1919 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 1920 size_t buflen, int flags) 1921 { 1922 struct sock *sk = sock->sk; 1923 struct tipc_sock *tsk = tipc_sk(sk); 1924 struct sk_buff *skb; 1925 struct tipc_msg *hdr; 1926 struct tipc_skb_cb *skb_cb; 1927 bool peek = flags & MSG_PEEK; 1928 int offset, required, copy, copied = 0; 1929 int hlen, dlen, err, rc; 1930 bool ack = false; 1931 long timeout; 1932 1933 /* Catch invalid receive attempts */ 1934 if (unlikely(!buflen)) 1935 return -EINVAL; 1936 1937 lock_sock(sk); 1938 1939 if (unlikely(sk->sk_state == TIPC_OPEN)) { 1940 rc = -ENOTCONN; 1941 goto exit; 1942 } 1943 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 1944 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1945 1946 do { 1947 /* Look at first msg in receive queue; wait if necessary */ 1948 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1949 if (unlikely(rc)) 1950 break; 1951 skb = skb_peek(&sk->sk_receive_queue); 1952 skb_cb = TIPC_SKB_CB(skb); 1953 hdr = buf_msg(skb); 1954 dlen = msg_data_sz(hdr); 1955 hlen = msg_hdr_sz(hdr); 1956 err = msg_errcode(hdr); 1957 1958 /* Discard any empty non-errored (SYN-) message */ 1959 if (unlikely(!dlen && !err)) { 1960 tsk_advance_rx_queue(sk); 1961 continue; 1962 } 1963 1964 /* Collect msg meta data, incl. error code and rejected data */ 1965 if (!copied) { 1966 tipc_sk_set_orig_addr(m, skb); 1967 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1968 if (rc) 1969 break; 1970 hdr = buf_msg(skb); 1971 } 1972 1973 /* Copy data if msg ok, otherwise return error/partial data */ 1974 if (likely(!err)) { 1975 ack = msg_ack_required(hdr); 1976 offset = skb_cb->bytes_read; 1977 copy = min_t(int, dlen - offset, buflen - copied); 1978 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 1979 if (unlikely(rc)) 1980 break; 1981 copied += copy; 1982 offset += copy; 1983 if (unlikely(offset < dlen)) { 1984 if (!peek) 1985 skb_cb->bytes_read = offset; 1986 break; 1987 } 1988 } else { 1989 rc = 0; 1990 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 1991 rc = -ECONNRESET; 1992 if (copied || rc) 1993 break; 1994 } 1995 1996 if (unlikely(peek)) 1997 break; 1998 1999 tsk_advance_rx_queue(sk); 2000 2001 /* Send connection flow control advertisement when applicable */ 2002 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2003 if (ack || tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2004 tipc_sk_send_ack(tsk); 2005 2006 /* Exit if all requested data or FIN/error received */ 2007 if (copied == buflen || err) 2008 break; 2009 2010 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2011 exit: 2012 release_sock(sk); 2013 return copied ? copied : rc; 2014 } 2015 2016 /** 2017 * tipc_write_space - wake up thread if port congestion is released 2018 * @sk: socket 2019 */ 2020 static void tipc_write_space(struct sock *sk) 2021 { 2022 struct socket_wq *wq; 2023 2024 rcu_read_lock(); 2025 wq = rcu_dereference(sk->sk_wq); 2026 if (skwq_has_sleeper(wq)) 2027 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2028 EPOLLWRNORM | EPOLLWRBAND); 2029 rcu_read_unlock(); 2030 } 2031 2032 /** 2033 * tipc_data_ready - wake up threads to indicate messages have been received 2034 * @sk: socket 2035 * @len: the length of messages 2036 */ 2037 static void tipc_data_ready(struct sock *sk) 2038 { 2039 struct socket_wq *wq; 2040 2041 rcu_read_lock(); 2042 wq = rcu_dereference(sk->sk_wq); 2043 if (skwq_has_sleeper(wq)) 2044 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2045 EPOLLRDNORM | EPOLLRDBAND); 2046 rcu_read_unlock(); 2047 } 2048 2049 static void tipc_sock_destruct(struct sock *sk) 2050 { 2051 __skb_queue_purge(&sk->sk_receive_queue); 2052 } 2053 2054 static void tipc_sk_proto_rcv(struct sock *sk, 2055 struct sk_buff_head *inputq, 2056 struct sk_buff_head *xmitq) 2057 { 2058 struct sk_buff *skb = __skb_dequeue(inputq); 2059 struct tipc_sock *tsk = tipc_sk(sk); 2060 struct tipc_msg *hdr = buf_msg(skb); 2061 struct tipc_group *grp = tsk->group; 2062 bool wakeup = false; 2063 2064 switch (msg_user(hdr)) { 2065 case CONN_MANAGER: 2066 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2067 return; 2068 case SOCK_WAKEUP: 2069 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2070 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2071 smp_wmb(); 2072 tsk->cong_link_cnt--; 2073 wakeup = true; 2074 tipc_sk_push_backlog(tsk); 2075 break; 2076 case GROUP_PROTOCOL: 2077 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2078 break; 2079 case TOP_SRV: 2080 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2081 hdr, inputq, xmitq); 2082 break; 2083 default: 2084 break; 2085 } 2086 2087 if (wakeup) 2088 sk->sk_write_space(sk); 2089 2090 kfree_skb(skb); 2091 } 2092 2093 /** 2094 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2095 * @tsk: TIPC socket 2096 * @skb: pointer to message buffer. 2097 * Returns true if message should be added to receive queue, false otherwise 2098 */ 2099 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb) 2100 { 2101 struct sock *sk = &tsk->sk; 2102 struct net *net = sock_net(sk); 2103 struct tipc_msg *hdr = buf_msg(skb); 2104 bool con_msg = msg_connected(hdr); 2105 u32 pport = tsk_peer_port(tsk); 2106 u32 pnode = tsk_peer_node(tsk); 2107 u32 oport = msg_origport(hdr); 2108 u32 onode = msg_orignode(hdr); 2109 int err = msg_errcode(hdr); 2110 unsigned long delay; 2111 2112 if (unlikely(msg_mcast(hdr))) 2113 return false; 2114 tsk->oneway = 0; 2115 2116 switch (sk->sk_state) { 2117 case TIPC_CONNECTING: 2118 /* Setup ACK */ 2119 if (likely(con_msg)) { 2120 if (err) 2121 break; 2122 tipc_sk_finish_conn(tsk, oport, onode); 2123 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2124 /* ACK+ message with data is added to receive queue */ 2125 if (msg_data_sz(hdr)) 2126 return true; 2127 /* Empty ACK-, - wake up sleeping connect() and drop */ 2128 sk->sk_state_change(sk); 2129 msg_set_dest_droppable(hdr, 1); 2130 return false; 2131 } 2132 /* Ignore connectionless message if not from listening socket */ 2133 if (oport != pport || onode != pnode) 2134 return false; 2135 2136 /* Rejected SYN */ 2137 if (err != TIPC_ERR_OVERLOAD) 2138 break; 2139 2140 /* Prepare for new setup attempt if we have a SYN clone */ 2141 if (skb_queue_empty(&sk->sk_write_queue)) 2142 break; 2143 get_random_bytes(&delay, 2); 2144 delay %= (tsk->conn_timeout / 4); 2145 delay = msecs_to_jiffies(delay + 100); 2146 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2147 return false; 2148 case TIPC_OPEN: 2149 case TIPC_DISCONNECTING: 2150 return false; 2151 case TIPC_LISTEN: 2152 /* Accept only SYN message */ 2153 if (!msg_is_syn(hdr) && 2154 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2155 return false; 2156 if (!con_msg && !err) 2157 return true; 2158 return false; 2159 case TIPC_ESTABLISHED: 2160 if (!skb_queue_empty(&sk->sk_write_queue)) 2161 tipc_sk_push_backlog(tsk); 2162 /* Accept only connection-based messages sent by peer */ 2163 if (likely(con_msg && !err && pport == oport && pnode == onode)) 2164 return true; 2165 if (!tsk_peer_msg(tsk, hdr)) 2166 return false; 2167 if (!err) 2168 return true; 2169 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2170 tipc_node_remove_conn(net, pnode, tsk->portid); 2171 sk->sk_state_change(sk); 2172 return true; 2173 default: 2174 pr_err("Unknown sk_state %u\n", sk->sk_state); 2175 } 2176 /* Abort connection setup attempt */ 2177 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2178 sk->sk_err = ECONNREFUSED; 2179 sk->sk_state_change(sk); 2180 return true; 2181 } 2182 2183 /** 2184 * rcvbuf_limit - get proper overload limit of socket receive queue 2185 * @sk: socket 2186 * @skb: message 2187 * 2188 * For connection oriented messages, irrespective of importance, 2189 * default queue limit is 2 MB. 2190 * 2191 * For connectionless messages, queue limits are based on message 2192 * importance as follows: 2193 * 2194 * TIPC_LOW_IMPORTANCE (2 MB) 2195 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2196 * TIPC_HIGH_IMPORTANCE (8 MB) 2197 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2198 * 2199 * Returns overload limit according to corresponding message importance 2200 */ 2201 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2202 { 2203 struct tipc_sock *tsk = tipc_sk(sk); 2204 struct tipc_msg *hdr = buf_msg(skb); 2205 2206 if (unlikely(msg_in_group(hdr))) 2207 return READ_ONCE(sk->sk_rcvbuf); 2208 2209 if (unlikely(!msg_connected(hdr))) 2210 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2211 2212 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2213 return READ_ONCE(sk->sk_rcvbuf); 2214 2215 return FLOWCTL_MSG_LIM; 2216 } 2217 2218 /** 2219 * tipc_sk_filter_rcv - validate incoming message 2220 * @sk: socket 2221 * @skb: pointer to message. 2222 * 2223 * Enqueues message on receive queue if acceptable; optionally handles 2224 * disconnect indication for a connected socket. 2225 * 2226 * Called with socket lock already taken 2227 * 2228 */ 2229 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2230 struct sk_buff_head *xmitq) 2231 { 2232 bool sk_conn = !tipc_sk_type_connectionless(sk); 2233 struct tipc_sock *tsk = tipc_sk(sk); 2234 struct tipc_group *grp = tsk->group; 2235 struct tipc_msg *hdr = buf_msg(skb); 2236 struct net *net = sock_net(sk); 2237 struct sk_buff_head inputq; 2238 int mtyp = msg_type(hdr); 2239 int limit, err = TIPC_OK; 2240 2241 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2242 TIPC_SKB_CB(skb)->bytes_read = 0; 2243 __skb_queue_head_init(&inputq); 2244 __skb_queue_tail(&inputq, skb); 2245 2246 if (unlikely(!msg_isdata(hdr))) 2247 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2248 2249 if (unlikely(grp)) 2250 tipc_group_filter_msg(grp, &inputq, xmitq); 2251 2252 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2253 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2254 2255 /* Validate and add to receive buffer if there is space */ 2256 while ((skb = __skb_dequeue(&inputq))) { 2257 hdr = buf_msg(skb); 2258 limit = rcvbuf_limit(sk, skb); 2259 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) || 2260 (!sk_conn && msg_connected(hdr)) || 2261 (!grp && msg_in_group(hdr))) 2262 err = TIPC_ERR_NO_PORT; 2263 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2264 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2265 "err_overload2!"); 2266 atomic_inc(&sk->sk_drops); 2267 err = TIPC_ERR_OVERLOAD; 2268 } 2269 2270 if (unlikely(err)) { 2271 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2272 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2273 "@filter_rcv!"); 2274 __skb_queue_tail(xmitq, skb); 2275 } 2276 err = TIPC_OK; 2277 continue; 2278 } 2279 __skb_queue_tail(&sk->sk_receive_queue, skb); 2280 skb_set_owner_r(skb, sk); 2281 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2282 "rcvq >90% allocated!"); 2283 sk->sk_data_ready(sk); 2284 } 2285 } 2286 2287 /** 2288 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2289 * @sk: socket 2290 * @skb: message 2291 * 2292 * Caller must hold socket lock 2293 */ 2294 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2295 { 2296 unsigned int before = sk_rmem_alloc_get(sk); 2297 struct sk_buff_head xmitq; 2298 unsigned int added; 2299 2300 __skb_queue_head_init(&xmitq); 2301 2302 tipc_sk_filter_rcv(sk, skb, &xmitq); 2303 added = sk_rmem_alloc_get(sk) - before; 2304 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2305 2306 /* Send pending response/rejected messages, if any */ 2307 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2308 return 0; 2309 } 2310 2311 /** 2312 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2313 * inputq and try adding them to socket or backlog queue 2314 * @inputq: list of incoming buffers with potentially different destinations 2315 * @sk: socket where the buffers should be enqueued 2316 * @dport: port number for the socket 2317 * 2318 * Caller must hold socket lock 2319 */ 2320 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2321 u32 dport, struct sk_buff_head *xmitq) 2322 { 2323 unsigned long time_limit = jiffies + 2; 2324 struct sk_buff *skb; 2325 unsigned int lim; 2326 atomic_t *dcnt; 2327 u32 onode; 2328 2329 while (skb_queue_len(inputq)) { 2330 if (unlikely(time_after_eq(jiffies, time_limit))) 2331 return; 2332 2333 skb = tipc_skb_dequeue(inputq, dport); 2334 if (unlikely(!skb)) 2335 return; 2336 2337 /* Add message directly to receive queue if possible */ 2338 if (!sock_owned_by_user(sk)) { 2339 tipc_sk_filter_rcv(sk, skb, xmitq); 2340 continue; 2341 } 2342 2343 /* Try backlog, compensating for double-counted bytes */ 2344 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2345 if (!sk->sk_backlog.len) 2346 atomic_set(dcnt, 0); 2347 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2348 if (likely(!sk_add_backlog(sk, skb, lim))) { 2349 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2350 "bklg & rcvq >90% allocated!"); 2351 continue; 2352 } 2353 2354 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2355 /* Overload => reject message back to sender */ 2356 onode = tipc_own_addr(sock_net(sk)); 2357 atomic_inc(&sk->sk_drops); 2358 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2359 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2360 "@sk_enqueue!"); 2361 __skb_queue_tail(xmitq, skb); 2362 } 2363 break; 2364 } 2365 } 2366 2367 /** 2368 * tipc_sk_rcv - handle a chain of incoming buffers 2369 * @inputq: buffer list containing the buffers 2370 * Consumes all buffers in list until inputq is empty 2371 * Note: may be called in multiple threads referring to the same queue 2372 */ 2373 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2374 { 2375 struct sk_buff_head xmitq; 2376 u32 dnode, dport = 0; 2377 int err; 2378 struct tipc_sock *tsk; 2379 struct sock *sk; 2380 struct sk_buff *skb; 2381 2382 __skb_queue_head_init(&xmitq); 2383 while (skb_queue_len(inputq)) { 2384 dport = tipc_skb_peek_port(inputq, dport); 2385 tsk = tipc_sk_lookup(net, dport); 2386 2387 if (likely(tsk)) { 2388 sk = &tsk->sk; 2389 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2390 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2391 spin_unlock_bh(&sk->sk_lock.slock); 2392 } 2393 /* Send pending response/rejected messages, if any */ 2394 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2395 sock_put(sk); 2396 continue; 2397 } 2398 /* No destination socket => dequeue skb if still there */ 2399 skb = tipc_skb_dequeue(inputq, dport); 2400 if (!skb) 2401 return; 2402 2403 /* Try secondary lookup if unresolved named message */ 2404 err = TIPC_ERR_NO_PORT; 2405 if (tipc_msg_lookup_dest(net, skb, &err)) 2406 goto xmit; 2407 2408 /* Prepare for message rejection */ 2409 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2410 continue; 2411 2412 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2413 xmit: 2414 dnode = msg_destnode(buf_msg(skb)); 2415 tipc_node_xmit_skb(net, skb, dnode, dport); 2416 } 2417 } 2418 2419 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2420 { 2421 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2422 struct sock *sk = sock->sk; 2423 int done; 2424 2425 do { 2426 int err = sock_error(sk); 2427 if (err) 2428 return err; 2429 if (!*timeo_p) 2430 return -ETIMEDOUT; 2431 if (signal_pending(current)) 2432 return sock_intr_errno(*timeo_p); 2433 2434 add_wait_queue(sk_sleep(sk), &wait); 2435 done = sk_wait_event(sk, timeo_p, 2436 sk->sk_state != TIPC_CONNECTING, &wait); 2437 remove_wait_queue(sk_sleep(sk), &wait); 2438 } while (!done); 2439 return 0; 2440 } 2441 2442 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2443 { 2444 if (addr->family != AF_TIPC) 2445 return false; 2446 if (addr->addrtype == TIPC_SERVICE_RANGE) 2447 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2448 return (addr->addrtype == TIPC_SERVICE_ADDR || 2449 addr->addrtype == TIPC_SOCKET_ADDR); 2450 } 2451 2452 /** 2453 * tipc_connect - establish a connection to another TIPC port 2454 * @sock: socket structure 2455 * @dest: socket address for destination port 2456 * @destlen: size of socket address data structure 2457 * @flags: file-related flags associated with socket 2458 * 2459 * Returns 0 on success, errno otherwise 2460 */ 2461 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2462 int destlen, int flags) 2463 { 2464 struct sock *sk = sock->sk; 2465 struct tipc_sock *tsk = tipc_sk(sk); 2466 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2467 struct msghdr m = {NULL,}; 2468 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2469 int previous; 2470 int res = 0; 2471 2472 if (destlen != sizeof(struct sockaddr_tipc)) 2473 return -EINVAL; 2474 2475 lock_sock(sk); 2476 2477 if (tsk->group) { 2478 res = -EINVAL; 2479 goto exit; 2480 } 2481 2482 if (dst->family == AF_UNSPEC) { 2483 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2484 if (!tipc_sk_type_connectionless(sk)) 2485 res = -EINVAL; 2486 goto exit; 2487 } 2488 if (!tipc_sockaddr_is_sane(dst)) { 2489 res = -EINVAL; 2490 goto exit; 2491 } 2492 /* DGRAM/RDM connect(), just save the destaddr */ 2493 if (tipc_sk_type_connectionless(sk)) { 2494 memcpy(&tsk->peer, dest, destlen); 2495 goto exit; 2496 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2497 res = -EINVAL; 2498 goto exit; 2499 } 2500 2501 previous = sk->sk_state; 2502 2503 switch (sk->sk_state) { 2504 case TIPC_OPEN: 2505 /* Send a 'SYN-' to destination */ 2506 m.msg_name = dest; 2507 m.msg_namelen = destlen; 2508 2509 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2510 * indicate send_msg() is never blocked. 2511 */ 2512 if (!timeout) 2513 m.msg_flags = MSG_DONTWAIT; 2514 2515 res = __tipc_sendmsg(sock, &m, 0); 2516 if ((res < 0) && (res != -EWOULDBLOCK)) 2517 goto exit; 2518 2519 /* Just entered TIPC_CONNECTING state; the only 2520 * difference is that return value in non-blocking 2521 * case is EINPROGRESS, rather than EALREADY. 2522 */ 2523 res = -EINPROGRESS; 2524 /* fall through */ 2525 case TIPC_CONNECTING: 2526 if (!timeout) { 2527 if (previous == TIPC_CONNECTING) 2528 res = -EALREADY; 2529 goto exit; 2530 } 2531 timeout = msecs_to_jiffies(timeout); 2532 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2533 res = tipc_wait_for_connect(sock, &timeout); 2534 break; 2535 case TIPC_ESTABLISHED: 2536 res = -EISCONN; 2537 break; 2538 default: 2539 res = -EINVAL; 2540 } 2541 2542 exit: 2543 release_sock(sk); 2544 return res; 2545 } 2546 2547 /** 2548 * tipc_listen - allow socket to listen for incoming connections 2549 * @sock: socket structure 2550 * @len: (unused) 2551 * 2552 * Returns 0 on success, errno otherwise 2553 */ 2554 static int tipc_listen(struct socket *sock, int len) 2555 { 2556 struct sock *sk = sock->sk; 2557 int res; 2558 2559 lock_sock(sk); 2560 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2561 release_sock(sk); 2562 2563 return res; 2564 } 2565 2566 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2567 { 2568 struct sock *sk = sock->sk; 2569 DEFINE_WAIT(wait); 2570 int err; 2571 2572 /* True wake-one mechanism for incoming connections: only 2573 * one process gets woken up, not the 'whole herd'. 2574 * Since we do not 'race & poll' for established sockets 2575 * anymore, the common case will execute the loop only once. 2576 */ 2577 for (;;) { 2578 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 2579 TASK_INTERRUPTIBLE); 2580 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2581 release_sock(sk); 2582 timeo = schedule_timeout(timeo); 2583 lock_sock(sk); 2584 } 2585 err = 0; 2586 if (!skb_queue_empty(&sk->sk_receive_queue)) 2587 break; 2588 err = -EAGAIN; 2589 if (!timeo) 2590 break; 2591 err = sock_intr_errno(timeo); 2592 if (signal_pending(current)) 2593 break; 2594 } 2595 finish_wait(sk_sleep(sk), &wait); 2596 return err; 2597 } 2598 2599 /** 2600 * tipc_accept - wait for connection request 2601 * @sock: listening socket 2602 * @newsock: new socket that is to be connected 2603 * @flags: file-related flags associated with socket 2604 * 2605 * Returns 0 on success, errno otherwise 2606 */ 2607 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2608 bool kern) 2609 { 2610 struct sock *new_sk, *sk = sock->sk; 2611 struct sk_buff *buf; 2612 struct tipc_sock *new_tsock; 2613 struct tipc_msg *msg; 2614 long timeo; 2615 int res; 2616 2617 lock_sock(sk); 2618 2619 if (sk->sk_state != TIPC_LISTEN) { 2620 res = -EINVAL; 2621 goto exit; 2622 } 2623 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2624 res = tipc_wait_for_accept(sock, timeo); 2625 if (res) 2626 goto exit; 2627 2628 buf = skb_peek(&sk->sk_receive_queue); 2629 2630 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2631 if (res) 2632 goto exit; 2633 security_sk_clone(sock->sk, new_sock->sk); 2634 2635 new_sk = new_sock->sk; 2636 new_tsock = tipc_sk(new_sk); 2637 msg = buf_msg(buf); 2638 2639 /* we lock on new_sk; but lockdep sees the lock on sk */ 2640 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2641 2642 /* 2643 * Reject any stray messages received by new socket 2644 * before the socket lock was taken (very, very unlikely) 2645 */ 2646 tsk_rej_rx_queue(new_sk); 2647 2648 /* Connect new socket to it's peer */ 2649 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2650 2651 tsk_set_importance(new_tsock, msg_importance(msg)); 2652 if (msg_named(msg)) { 2653 new_tsock->conn_type = msg_nametype(msg); 2654 new_tsock->conn_instance = msg_nameinst(msg); 2655 } 2656 2657 /* 2658 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 2659 * Respond to 'SYN+' by queuing it on new socket. 2660 */ 2661 if (!msg_data_sz(msg)) { 2662 struct msghdr m = {NULL,}; 2663 2664 tsk_advance_rx_queue(sk); 2665 __tipc_sendstream(new_sock, &m, 0); 2666 } else { 2667 __skb_dequeue(&sk->sk_receive_queue); 2668 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2669 skb_set_owner_r(buf, new_sk); 2670 } 2671 release_sock(new_sk); 2672 exit: 2673 release_sock(sk); 2674 return res; 2675 } 2676 2677 /** 2678 * tipc_shutdown - shutdown socket connection 2679 * @sock: socket structure 2680 * @how: direction to close (must be SHUT_RDWR) 2681 * 2682 * Terminates connection (if necessary), then purges socket's receive queue. 2683 * 2684 * Returns 0 on success, errno otherwise 2685 */ 2686 static int tipc_shutdown(struct socket *sock, int how) 2687 { 2688 struct sock *sk = sock->sk; 2689 int res; 2690 2691 if (how != SHUT_RDWR) 2692 return -EINVAL; 2693 2694 lock_sock(sk); 2695 2696 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2697 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2698 sk->sk_shutdown = SEND_SHUTDOWN; 2699 2700 if (sk->sk_state == TIPC_DISCONNECTING) { 2701 /* Discard any unreceived messages */ 2702 __skb_queue_purge(&sk->sk_receive_queue); 2703 2704 /* Wake up anyone sleeping in poll */ 2705 sk->sk_state_change(sk); 2706 res = 0; 2707 } else { 2708 res = -ENOTCONN; 2709 } 2710 2711 release_sock(sk); 2712 return res; 2713 } 2714 2715 static void tipc_sk_check_probing_state(struct sock *sk, 2716 struct sk_buff_head *list) 2717 { 2718 struct tipc_sock *tsk = tipc_sk(sk); 2719 u32 pnode = tsk_peer_node(tsk); 2720 u32 pport = tsk_peer_port(tsk); 2721 u32 self = tsk_own_node(tsk); 2722 u32 oport = tsk->portid; 2723 struct sk_buff *skb; 2724 2725 if (tsk->probe_unacked) { 2726 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2727 sk->sk_err = ECONNABORTED; 2728 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2729 sk->sk_state_change(sk); 2730 return; 2731 } 2732 /* Prepare new probe */ 2733 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2734 pnode, self, pport, oport, TIPC_OK); 2735 if (skb) 2736 __skb_queue_tail(list, skb); 2737 tsk->probe_unacked = true; 2738 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2739 } 2740 2741 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2742 { 2743 struct tipc_sock *tsk = tipc_sk(sk); 2744 2745 /* Try again later if dest link is congested */ 2746 if (tsk->cong_link_cnt) { 2747 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2748 return; 2749 } 2750 /* Prepare SYN for retransmit */ 2751 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2752 } 2753 2754 static void tipc_sk_timeout(struct timer_list *t) 2755 { 2756 struct sock *sk = from_timer(sk, t, sk_timer); 2757 struct tipc_sock *tsk = tipc_sk(sk); 2758 u32 pnode = tsk_peer_node(tsk); 2759 struct sk_buff_head list; 2760 int rc = 0; 2761 2762 __skb_queue_head_init(&list); 2763 bh_lock_sock(sk); 2764 2765 /* Try again later if socket is busy */ 2766 if (sock_owned_by_user(sk)) { 2767 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2768 bh_unlock_sock(sk); 2769 sock_put(sk); 2770 return; 2771 } 2772 2773 if (sk->sk_state == TIPC_ESTABLISHED) 2774 tipc_sk_check_probing_state(sk, &list); 2775 else if (sk->sk_state == TIPC_CONNECTING) 2776 tipc_sk_retry_connect(sk, &list); 2777 2778 bh_unlock_sock(sk); 2779 2780 if (!skb_queue_empty(&list)) 2781 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2782 2783 /* SYN messages may cause link congestion */ 2784 if (rc == -ELINKCONG) { 2785 tipc_dest_push(&tsk->cong_links, pnode, 0); 2786 tsk->cong_link_cnt = 1; 2787 } 2788 sock_put(sk); 2789 } 2790 2791 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 2792 struct tipc_name_seq const *seq) 2793 { 2794 struct sock *sk = &tsk->sk; 2795 struct net *net = sock_net(sk); 2796 struct publication *publ; 2797 u32 key; 2798 2799 if (scope != TIPC_NODE_SCOPE) 2800 scope = TIPC_CLUSTER_SCOPE; 2801 2802 if (tipc_sk_connected(sk)) 2803 return -EINVAL; 2804 key = tsk->portid + tsk->pub_count + 1; 2805 if (key == tsk->portid) 2806 return -EADDRINUSE; 2807 2808 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper, 2809 scope, tsk->portid, key); 2810 if (unlikely(!publ)) 2811 return -EINVAL; 2812 2813 list_add(&publ->binding_sock, &tsk->publications); 2814 tsk->pub_count++; 2815 tsk->published = 1; 2816 return 0; 2817 } 2818 2819 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 2820 struct tipc_name_seq const *seq) 2821 { 2822 struct net *net = sock_net(&tsk->sk); 2823 struct publication *publ; 2824 struct publication *safe; 2825 int rc = -EINVAL; 2826 2827 if (scope != TIPC_NODE_SCOPE) 2828 scope = TIPC_CLUSTER_SCOPE; 2829 2830 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) { 2831 if (seq) { 2832 if (publ->scope != scope) 2833 continue; 2834 if (publ->type != seq->type) 2835 continue; 2836 if (publ->lower != seq->lower) 2837 continue; 2838 if (publ->upper != seq->upper) 2839 break; 2840 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2841 publ->upper, publ->key); 2842 rc = 0; 2843 break; 2844 } 2845 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2846 publ->upper, publ->key); 2847 rc = 0; 2848 } 2849 if (list_empty(&tsk->publications)) 2850 tsk->published = 0; 2851 return rc; 2852 } 2853 2854 /* tipc_sk_reinit: set non-zero address in all existing sockets 2855 * when we go from standalone to network mode. 2856 */ 2857 void tipc_sk_reinit(struct net *net) 2858 { 2859 struct tipc_net *tn = net_generic(net, tipc_net_id); 2860 struct rhashtable_iter iter; 2861 struct tipc_sock *tsk; 2862 struct tipc_msg *msg; 2863 2864 rhashtable_walk_enter(&tn->sk_rht, &iter); 2865 2866 do { 2867 rhashtable_walk_start(&iter); 2868 2869 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2870 sock_hold(&tsk->sk); 2871 rhashtable_walk_stop(&iter); 2872 lock_sock(&tsk->sk); 2873 msg = &tsk->phdr; 2874 msg_set_prevnode(msg, tipc_own_addr(net)); 2875 msg_set_orignode(msg, tipc_own_addr(net)); 2876 release_sock(&tsk->sk); 2877 rhashtable_walk_start(&iter); 2878 sock_put(&tsk->sk); 2879 } 2880 2881 rhashtable_walk_stop(&iter); 2882 } while (tsk == ERR_PTR(-EAGAIN)); 2883 2884 rhashtable_walk_exit(&iter); 2885 } 2886 2887 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2888 { 2889 struct tipc_net *tn = net_generic(net, tipc_net_id); 2890 struct tipc_sock *tsk; 2891 2892 rcu_read_lock(); 2893 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2894 if (tsk) 2895 sock_hold(&tsk->sk); 2896 rcu_read_unlock(); 2897 2898 return tsk; 2899 } 2900 2901 static int tipc_sk_insert(struct tipc_sock *tsk) 2902 { 2903 struct sock *sk = &tsk->sk; 2904 struct net *net = sock_net(sk); 2905 struct tipc_net *tn = net_generic(net, tipc_net_id); 2906 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 2907 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 2908 2909 while (remaining--) { 2910 portid++; 2911 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 2912 portid = TIPC_MIN_PORT; 2913 tsk->portid = portid; 2914 sock_hold(&tsk->sk); 2915 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 2916 tsk_rht_params)) 2917 return 0; 2918 sock_put(&tsk->sk); 2919 } 2920 2921 return -1; 2922 } 2923 2924 static void tipc_sk_remove(struct tipc_sock *tsk) 2925 { 2926 struct sock *sk = &tsk->sk; 2927 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 2928 2929 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 2930 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 2931 __sock_put(sk); 2932 } 2933 } 2934 2935 static const struct rhashtable_params tsk_rht_params = { 2936 .nelem_hint = 192, 2937 .head_offset = offsetof(struct tipc_sock, node), 2938 .key_offset = offsetof(struct tipc_sock, portid), 2939 .key_len = sizeof(u32), /* portid */ 2940 .max_size = 1048576, 2941 .min_size = 256, 2942 .automatic_shrinking = true, 2943 }; 2944 2945 int tipc_sk_rht_init(struct net *net) 2946 { 2947 struct tipc_net *tn = net_generic(net, tipc_net_id); 2948 2949 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 2950 } 2951 2952 void tipc_sk_rht_destroy(struct net *net) 2953 { 2954 struct tipc_net *tn = net_generic(net, tipc_net_id); 2955 2956 /* Wait for socket readers to complete */ 2957 synchronize_net(); 2958 2959 rhashtable_destroy(&tn->sk_rht); 2960 } 2961 2962 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 2963 { 2964 struct net *net = sock_net(&tsk->sk); 2965 struct tipc_group *grp = tsk->group; 2966 struct tipc_msg *hdr = &tsk->phdr; 2967 struct tipc_name_seq seq; 2968 int rc; 2969 2970 if (mreq->type < TIPC_RESERVED_TYPES) 2971 return -EACCES; 2972 if (mreq->scope > TIPC_NODE_SCOPE) 2973 return -EINVAL; 2974 if (grp) 2975 return -EACCES; 2976 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 2977 if (!grp) 2978 return -ENOMEM; 2979 tsk->group = grp; 2980 msg_set_lookup_scope(hdr, mreq->scope); 2981 msg_set_nametype(hdr, mreq->type); 2982 msg_set_dest_droppable(hdr, true); 2983 seq.type = mreq->type; 2984 seq.lower = mreq->instance; 2985 seq.upper = seq.lower; 2986 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope); 2987 rc = tipc_sk_publish(tsk, mreq->scope, &seq); 2988 if (rc) { 2989 tipc_group_delete(net, grp); 2990 tsk->group = NULL; 2991 return rc; 2992 } 2993 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 2994 tsk->mc_method.rcast = true; 2995 tsk->mc_method.mandatory = true; 2996 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 2997 return rc; 2998 } 2999 3000 static int tipc_sk_leave(struct tipc_sock *tsk) 3001 { 3002 struct net *net = sock_net(&tsk->sk); 3003 struct tipc_group *grp = tsk->group; 3004 struct tipc_name_seq seq; 3005 int scope; 3006 3007 if (!grp) 3008 return -EINVAL; 3009 tipc_group_self(grp, &seq, &scope); 3010 tipc_group_delete(net, grp); 3011 tsk->group = NULL; 3012 tipc_sk_withdraw(tsk, scope, &seq); 3013 return 0; 3014 } 3015 3016 /** 3017 * tipc_setsockopt - set socket option 3018 * @sock: socket structure 3019 * @lvl: option level 3020 * @opt: option identifier 3021 * @ov: pointer to new option value 3022 * @ol: length of option value 3023 * 3024 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3025 * (to ease compatibility). 3026 * 3027 * Returns 0 on success, errno otherwise 3028 */ 3029 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3030 char __user *ov, unsigned int ol) 3031 { 3032 struct sock *sk = sock->sk; 3033 struct tipc_sock *tsk = tipc_sk(sk); 3034 struct tipc_group_req mreq; 3035 u32 value = 0; 3036 int res = 0; 3037 3038 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3039 return 0; 3040 if (lvl != SOL_TIPC) 3041 return -ENOPROTOOPT; 3042 3043 switch (opt) { 3044 case TIPC_IMPORTANCE: 3045 case TIPC_SRC_DROPPABLE: 3046 case TIPC_DEST_DROPPABLE: 3047 case TIPC_CONN_TIMEOUT: 3048 case TIPC_NODELAY: 3049 if (ol < sizeof(value)) 3050 return -EINVAL; 3051 if (get_user(value, (u32 __user *)ov)) 3052 return -EFAULT; 3053 break; 3054 case TIPC_GROUP_JOIN: 3055 if (ol < sizeof(mreq)) 3056 return -EINVAL; 3057 if (copy_from_user(&mreq, ov, sizeof(mreq))) 3058 return -EFAULT; 3059 break; 3060 default: 3061 if (ov || ol) 3062 return -EINVAL; 3063 } 3064 3065 lock_sock(sk); 3066 3067 switch (opt) { 3068 case TIPC_IMPORTANCE: 3069 res = tsk_set_importance(tsk, value); 3070 break; 3071 case TIPC_SRC_DROPPABLE: 3072 if (sock->type != SOCK_STREAM) 3073 tsk_set_unreliable(tsk, value); 3074 else 3075 res = -ENOPROTOOPT; 3076 break; 3077 case TIPC_DEST_DROPPABLE: 3078 tsk_set_unreturnable(tsk, value); 3079 break; 3080 case TIPC_CONN_TIMEOUT: 3081 tipc_sk(sk)->conn_timeout = value; 3082 break; 3083 case TIPC_MCAST_BROADCAST: 3084 tsk->mc_method.rcast = false; 3085 tsk->mc_method.mandatory = true; 3086 break; 3087 case TIPC_MCAST_REPLICAST: 3088 tsk->mc_method.rcast = true; 3089 tsk->mc_method.mandatory = true; 3090 break; 3091 case TIPC_GROUP_JOIN: 3092 res = tipc_sk_join(tsk, &mreq); 3093 break; 3094 case TIPC_GROUP_LEAVE: 3095 res = tipc_sk_leave(tsk); 3096 break; 3097 case TIPC_NODELAY: 3098 tsk->nodelay = !!value; 3099 tsk_set_nagle(tsk); 3100 break; 3101 default: 3102 res = -EINVAL; 3103 } 3104 3105 release_sock(sk); 3106 3107 return res; 3108 } 3109 3110 /** 3111 * tipc_getsockopt - get socket option 3112 * @sock: socket structure 3113 * @lvl: option level 3114 * @opt: option identifier 3115 * @ov: receptacle for option value 3116 * @ol: receptacle for length of option value 3117 * 3118 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3119 * (to ease compatibility). 3120 * 3121 * Returns 0 on success, errno otherwise 3122 */ 3123 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3124 char __user *ov, int __user *ol) 3125 { 3126 struct sock *sk = sock->sk; 3127 struct tipc_sock *tsk = tipc_sk(sk); 3128 struct tipc_name_seq seq; 3129 int len, scope; 3130 u32 value; 3131 int res; 3132 3133 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3134 return put_user(0, ol); 3135 if (lvl != SOL_TIPC) 3136 return -ENOPROTOOPT; 3137 res = get_user(len, ol); 3138 if (res) 3139 return res; 3140 3141 lock_sock(sk); 3142 3143 switch (opt) { 3144 case TIPC_IMPORTANCE: 3145 value = tsk_importance(tsk); 3146 break; 3147 case TIPC_SRC_DROPPABLE: 3148 value = tsk_unreliable(tsk); 3149 break; 3150 case TIPC_DEST_DROPPABLE: 3151 value = tsk_unreturnable(tsk); 3152 break; 3153 case TIPC_CONN_TIMEOUT: 3154 value = tsk->conn_timeout; 3155 /* no need to set "res", since already 0 at this point */ 3156 break; 3157 case TIPC_NODE_RECVQ_DEPTH: 3158 value = 0; /* was tipc_queue_size, now obsolete */ 3159 break; 3160 case TIPC_SOCK_RECVQ_DEPTH: 3161 value = skb_queue_len(&sk->sk_receive_queue); 3162 break; 3163 case TIPC_SOCK_RECVQ_USED: 3164 value = sk_rmem_alloc_get(sk); 3165 break; 3166 case TIPC_GROUP_JOIN: 3167 seq.type = 0; 3168 if (tsk->group) 3169 tipc_group_self(tsk->group, &seq, &scope); 3170 value = seq.type; 3171 break; 3172 default: 3173 res = -EINVAL; 3174 } 3175 3176 release_sock(sk); 3177 3178 if (res) 3179 return res; /* "get" failed */ 3180 3181 if (len < sizeof(value)) 3182 return -EINVAL; 3183 3184 if (copy_to_user(ov, &value, sizeof(value))) 3185 return -EFAULT; 3186 3187 return put_user(sizeof(value), ol); 3188 } 3189 3190 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3191 { 3192 struct net *net = sock_net(sock->sk); 3193 struct tipc_sioc_nodeid_req nr = {0}; 3194 struct tipc_sioc_ln_req lnr; 3195 void __user *argp = (void __user *)arg; 3196 3197 switch (cmd) { 3198 case SIOCGETLINKNAME: 3199 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3200 return -EFAULT; 3201 if (!tipc_node_get_linkname(net, 3202 lnr.bearer_id & 0xffff, lnr.peer, 3203 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3204 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3205 return -EFAULT; 3206 return 0; 3207 } 3208 return -EADDRNOTAVAIL; 3209 case SIOCGETNODEID: 3210 if (copy_from_user(&nr, argp, sizeof(nr))) 3211 return -EFAULT; 3212 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3213 return -EADDRNOTAVAIL; 3214 if (copy_to_user(argp, &nr, sizeof(nr))) 3215 return -EFAULT; 3216 return 0; 3217 default: 3218 return -ENOIOCTLCMD; 3219 } 3220 } 3221 3222 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3223 { 3224 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3225 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3226 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3227 3228 tsk1->peer.family = AF_TIPC; 3229 tsk1->peer.addrtype = TIPC_ADDR_ID; 3230 tsk1->peer.scope = TIPC_NODE_SCOPE; 3231 tsk1->peer.addr.id.ref = tsk2->portid; 3232 tsk1->peer.addr.id.node = onode; 3233 tsk2->peer.family = AF_TIPC; 3234 tsk2->peer.addrtype = TIPC_ADDR_ID; 3235 tsk2->peer.scope = TIPC_NODE_SCOPE; 3236 tsk2->peer.addr.id.ref = tsk1->portid; 3237 tsk2->peer.addr.id.node = onode; 3238 3239 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3240 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3241 return 0; 3242 } 3243 3244 /* Protocol switches for the various types of TIPC sockets */ 3245 3246 static const struct proto_ops msg_ops = { 3247 .owner = THIS_MODULE, 3248 .family = AF_TIPC, 3249 .release = tipc_release, 3250 .bind = tipc_bind, 3251 .connect = tipc_connect, 3252 .socketpair = tipc_socketpair, 3253 .accept = sock_no_accept, 3254 .getname = tipc_getname, 3255 .poll = tipc_poll, 3256 .ioctl = tipc_ioctl, 3257 .listen = sock_no_listen, 3258 .shutdown = tipc_shutdown, 3259 .setsockopt = tipc_setsockopt, 3260 .getsockopt = tipc_getsockopt, 3261 .sendmsg = tipc_sendmsg, 3262 .recvmsg = tipc_recvmsg, 3263 .mmap = sock_no_mmap, 3264 .sendpage = sock_no_sendpage 3265 }; 3266 3267 static const struct proto_ops packet_ops = { 3268 .owner = THIS_MODULE, 3269 .family = AF_TIPC, 3270 .release = tipc_release, 3271 .bind = tipc_bind, 3272 .connect = tipc_connect, 3273 .socketpair = tipc_socketpair, 3274 .accept = tipc_accept, 3275 .getname = tipc_getname, 3276 .poll = tipc_poll, 3277 .ioctl = tipc_ioctl, 3278 .listen = tipc_listen, 3279 .shutdown = tipc_shutdown, 3280 .setsockopt = tipc_setsockopt, 3281 .getsockopt = tipc_getsockopt, 3282 .sendmsg = tipc_send_packet, 3283 .recvmsg = tipc_recvmsg, 3284 .mmap = sock_no_mmap, 3285 .sendpage = sock_no_sendpage 3286 }; 3287 3288 static const struct proto_ops stream_ops = { 3289 .owner = THIS_MODULE, 3290 .family = AF_TIPC, 3291 .release = tipc_release, 3292 .bind = tipc_bind, 3293 .connect = tipc_connect, 3294 .socketpair = tipc_socketpair, 3295 .accept = tipc_accept, 3296 .getname = tipc_getname, 3297 .poll = tipc_poll, 3298 .ioctl = tipc_ioctl, 3299 .listen = tipc_listen, 3300 .shutdown = tipc_shutdown, 3301 .setsockopt = tipc_setsockopt, 3302 .getsockopt = tipc_getsockopt, 3303 .sendmsg = tipc_sendstream, 3304 .recvmsg = tipc_recvstream, 3305 .mmap = sock_no_mmap, 3306 .sendpage = sock_no_sendpage 3307 }; 3308 3309 static const struct net_proto_family tipc_family_ops = { 3310 .owner = THIS_MODULE, 3311 .family = AF_TIPC, 3312 .create = tipc_sk_create 3313 }; 3314 3315 static struct proto tipc_proto = { 3316 .name = "TIPC", 3317 .owner = THIS_MODULE, 3318 .obj_size = sizeof(struct tipc_sock), 3319 .sysctl_rmem = sysctl_tipc_rmem 3320 }; 3321 3322 /** 3323 * tipc_socket_init - initialize TIPC socket interface 3324 * 3325 * Returns 0 on success, errno otherwise 3326 */ 3327 int tipc_socket_init(void) 3328 { 3329 int res; 3330 3331 res = proto_register(&tipc_proto, 1); 3332 if (res) { 3333 pr_err("Failed to register TIPC protocol type\n"); 3334 goto out; 3335 } 3336 3337 res = sock_register(&tipc_family_ops); 3338 if (res) { 3339 pr_err("Failed to register TIPC socket type\n"); 3340 proto_unregister(&tipc_proto); 3341 goto out; 3342 } 3343 out: 3344 return res; 3345 } 3346 3347 /** 3348 * tipc_socket_stop - stop TIPC socket interface 3349 */ 3350 void tipc_socket_stop(void) 3351 { 3352 sock_unregister(tipc_family_ops.family); 3353 proto_unregister(&tipc_proto); 3354 } 3355 3356 /* Caller should hold socket lock for the passed tipc socket. */ 3357 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3358 { 3359 u32 peer_node; 3360 u32 peer_port; 3361 struct nlattr *nest; 3362 3363 peer_node = tsk_peer_node(tsk); 3364 peer_port = tsk_peer_port(tsk); 3365 3366 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3367 if (!nest) 3368 return -EMSGSIZE; 3369 3370 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3371 goto msg_full; 3372 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3373 goto msg_full; 3374 3375 if (tsk->conn_type != 0) { 3376 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3377 goto msg_full; 3378 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) 3379 goto msg_full; 3380 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) 3381 goto msg_full; 3382 } 3383 nla_nest_end(skb, nest); 3384 3385 return 0; 3386 3387 msg_full: 3388 nla_nest_cancel(skb, nest); 3389 3390 return -EMSGSIZE; 3391 } 3392 3393 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3394 *tsk) 3395 { 3396 struct net *net = sock_net(skb->sk); 3397 struct sock *sk = &tsk->sk; 3398 3399 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3400 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3401 return -EMSGSIZE; 3402 3403 if (tipc_sk_connected(sk)) { 3404 if (__tipc_nl_add_sk_con(skb, tsk)) 3405 return -EMSGSIZE; 3406 } else if (!list_empty(&tsk->publications)) { 3407 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3408 return -EMSGSIZE; 3409 } 3410 return 0; 3411 } 3412 3413 /* Caller should hold socket lock for the passed tipc socket. */ 3414 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3415 struct tipc_sock *tsk) 3416 { 3417 struct nlattr *attrs; 3418 void *hdr; 3419 3420 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3421 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3422 if (!hdr) 3423 goto msg_cancel; 3424 3425 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3426 if (!attrs) 3427 goto genlmsg_cancel; 3428 3429 if (__tipc_nl_add_sk_info(skb, tsk)) 3430 goto attr_msg_cancel; 3431 3432 nla_nest_end(skb, attrs); 3433 genlmsg_end(skb, hdr); 3434 3435 return 0; 3436 3437 attr_msg_cancel: 3438 nla_nest_cancel(skb, attrs); 3439 genlmsg_cancel: 3440 genlmsg_cancel(skb, hdr); 3441 msg_cancel: 3442 return -EMSGSIZE; 3443 } 3444 3445 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3446 int (*skb_handler)(struct sk_buff *skb, 3447 struct netlink_callback *cb, 3448 struct tipc_sock *tsk)) 3449 { 3450 struct rhashtable_iter *iter = (void *)cb->args[4]; 3451 struct tipc_sock *tsk; 3452 int err; 3453 3454 rhashtable_walk_start(iter); 3455 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3456 if (IS_ERR(tsk)) { 3457 err = PTR_ERR(tsk); 3458 if (err == -EAGAIN) { 3459 err = 0; 3460 continue; 3461 } 3462 break; 3463 } 3464 3465 sock_hold(&tsk->sk); 3466 rhashtable_walk_stop(iter); 3467 lock_sock(&tsk->sk); 3468 err = skb_handler(skb, cb, tsk); 3469 if (err) { 3470 release_sock(&tsk->sk); 3471 sock_put(&tsk->sk); 3472 goto out; 3473 } 3474 release_sock(&tsk->sk); 3475 rhashtable_walk_start(iter); 3476 sock_put(&tsk->sk); 3477 } 3478 rhashtable_walk_stop(iter); 3479 out: 3480 return skb->len; 3481 } 3482 EXPORT_SYMBOL(tipc_nl_sk_walk); 3483 3484 int tipc_dump_start(struct netlink_callback *cb) 3485 { 3486 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3487 } 3488 EXPORT_SYMBOL(tipc_dump_start); 3489 3490 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3491 { 3492 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3493 struct rhashtable_iter *iter = (void *)cb->args[4]; 3494 struct tipc_net *tn = tipc_net(net); 3495 3496 if (!iter) { 3497 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3498 if (!iter) 3499 return -ENOMEM; 3500 3501 cb->args[4] = (long)iter; 3502 } 3503 3504 rhashtable_walk_enter(&tn->sk_rht, iter); 3505 return 0; 3506 } 3507 3508 int tipc_dump_done(struct netlink_callback *cb) 3509 { 3510 struct rhashtable_iter *hti = (void *)cb->args[4]; 3511 3512 rhashtable_walk_exit(hti); 3513 kfree(hti); 3514 return 0; 3515 } 3516 EXPORT_SYMBOL(tipc_dump_done); 3517 3518 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3519 struct tipc_sock *tsk, u32 sk_filter_state, 3520 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3521 { 3522 struct sock *sk = &tsk->sk; 3523 struct nlattr *attrs; 3524 struct nlattr *stat; 3525 3526 /*filter response w.r.t sk_state*/ 3527 if (!(sk_filter_state & (1 << sk->sk_state))) 3528 return 0; 3529 3530 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3531 if (!attrs) 3532 goto msg_cancel; 3533 3534 if (__tipc_nl_add_sk_info(skb, tsk)) 3535 goto attr_msg_cancel; 3536 3537 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3538 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3539 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3540 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3541 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3542 sock_i_uid(sk))) || 3543 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3544 tipc_diag_gen_cookie(sk), 3545 TIPC_NLA_SOCK_PAD)) 3546 goto attr_msg_cancel; 3547 3548 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3549 if (!stat) 3550 goto attr_msg_cancel; 3551 3552 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3553 skb_queue_len(&sk->sk_receive_queue)) || 3554 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3555 skb_queue_len(&sk->sk_write_queue)) || 3556 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3557 atomic_read(&sk->sk_drops))) 3558 goto stat_msg_cancel; 3559 3560 if (tsk->cong_link_cnt && 3561 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3562 goto stat_msg_cancel; 3563 3564 if (tsk_conn_cong(tsk) && 3565 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3566 goto stat_msg_cancel; 3567 3568 nla_nest_end(skb, stat); 3569 3570 if (tsk->group) 3571 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3572 goto stat_msg_cancel; 3573 3574 nla_nest_end(skb, attrs); 3575 3576 return 0; 3577 3578 stat_msg_cancel: 3579 nla_nest_cancel(skb, stat); 3580 attr_msg_cancel: 3581 nla_nest_cancel(skb, attrs); 3582 msg_cancel: 3583 return -EMSGSIZE; 3584 } 3585 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3586 3587 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3588 { 3589 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3590 } 3591 3592 /* Caller should hold socket lock for the passed tipc socket. */ 3593 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3594 struct netlink_callback *cb, 3595 struct publication *publ) 3596 { 3597 void *hdr; 3598 struct nlattr *attrs; 3599 3600 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3601 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3602 if (!hdr) 3603 goto msg_cancel; 3604 3605 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3606 if (!attrs) 3607 goto genlmsg_cancel; 3608 3609 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3610 goto attr_msg_cancel; 3611 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) 3612 goto attr_msg_cancel; 3613 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) 3614 goto attr_msg_cancel; 3615 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) 3616 goto attr_msg_cancel; 3617 3618 nla_nest_end(skb, attrs); 3619 genlmsg_end(skb, hdr); 3620 3621 return 0; 3622 3623 attr_msg_cancel: 3624 nla_nest_cancel(skb, attrs); 3625 genlmsg_cancel: 3626 genlmsg_cancel(skb, hdr); 3627 msg_cancel: 3628 return -EMSGSIZE; 3629 } 3630 3631 /* Caller should hold socket lock for the passed tipc socket. */ 3632 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3633 struct netlink_callback *cb, 3634 struct tipc_sock *tsk, u32 *last_publ) 3635 { 3636 int err; 3637 struct publication *p; 3638 3639 if (*last_publ) { 3640 list_for_each_entry(p, &tsk->publications, binding_sock) { 3641 if (p->key == *last_publ) 3642 break; 3643 } 3644 if (p->key != *last_publ) { 3645 /* We never set seq or call nl_dump_check_consistent() 3646 * this means that setting prev_seq here will cause the 3647 * consistence check to fail in the netlink callback 3648 * handler. Resulting in the last NLMSG_DONE message 3649 * having the NLM_F_DUMP_INTR flag set. 3650 */ 3651 cb->prev_seq = 1; 3652 *last_publ = 0; 3653 return -EPIPE; 3654 } 3655 } else { 3656 p = list_first_entry(&tsk->publications, struct publication, 3657 binding_sock); 3658 } 3659 3660 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3661 err = __tipc_nl_add_sk_publ(skb, cb, p); 3662 if (err) { 3663 *last_publ = p->key; 3664 return err; 3665 } 3666 } 3667 *last_publ = 0; 3668 3669 return 0; 3670 } 3671 3672 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3673 { 3674 int err; 3675 u32 tsk_portid = cb->args[0]; 3676 u32 last_publ = cb->args[1]; 3677 u32 done = cb->args[2]; 3678 struct net *net = sock_net(skb->sk); 3679 struct tipc_sock *tsk; 3680 3681 if (!tsk_portid) { 3682 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3683 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3684 3685 if (!attrs[TIPC_NLA_SOCK]) 3686 return -EINVAL; 3687 3688 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3689 attrs[TIPC_NLA_SOCK], 3690 tipc_nl_sock_policy, NULL); 3691 if (err) 3692 return err; 3693 3694 if (!sock[TIPC_NLA_SOCK_REF]) 3695 return -EINVAL; 3696 3697 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3698 } 3699 3700 if (done) 3701 return 0; 3702 3703 tsk = tipc_sk_lookup(net, tsk_portid); 3704 if (!tsk) 3705 return -EINVAL; 3706 3707 lock_sock(&tsk->sk); 3708 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3709 if (!err) 3710 done = 1; 3711 release_sock(&tsk->sk); 3712 sock_put(&tsk->sk); 3713 3714 cb->args[0] = tsk_portid; 3715 cb->args[1] = last_publ; 3716 cb->args[2] = done; 3717 3718 return skb->len; 3719 } 3720 3721 /** 3722 * tipc_sk_filtering - check if a socket should be traced 3723 * @sk: the socket to be examined 3724 * @sysctl_tipc_sk_filter[]: the socket tuple for filtering, 3725 * (portid, sock type, name type, name lower, name upper) 3726 * 3727 * Returns true if the socket meets the socket tuple data 3728 * (value 0 = 'any') or when there is no tuple set (all = 0), 3729 * otherwise false 3730 */ 3731 bool tipc_sk_filtering(struct sock *sk) 3732 { 3733 struct tipc_sock *tsk; 3734 struct publication *p; 3735 u32 _port, _sktype, _type, _lower, _upper; 3736 u32 type = 0, lower = 0, upper = 0; 3737 3738 if (!sk) 3739 return true; 3740 3741 tsk = tipc_sk(sk); 3742 3743 _port = sysctl_tipc_sk_filter[0]; 3744 _sktype = sysctl_tipc_sk_filter[1]; 3745 _type = sysctl_tipc_sk_filter[2]; 3746 _lower = sysctl_tipc_sk_filter[3]; 3747 _upper = sysctl_tipc_sk_filter[4]; 3748 3749 if (!_port && !_sktype && !_type && !_lower && !_upper) 3750 return true; 3751 3752 if (_port) 3753 return (_port == tsk->portid); 3754 3755 if (_sktype && _sktype != sk->sk_type) 3756 return false; 3757 3758 if (tsk->published) { 3759 p = list_first_entry_or_null(&tsk->publications, 3760 struct publication, binding_sock); 3761 if (p) { 3762 type = p->type; 3763 lower = p->lower; 3764 upper = p->upper; 3765 } 3766 } 3767 3768 if (!tipc_sk_type_connectionless(sk)) { 3769 type = tsk->conn_type; 3770 lower = tsk->conn_instance; 3771 upper = tsk->conn_instance; 3772 } 3773 3774 if ((_type && _type != type) || (_lower && _lower != lower) || 3775 (_upper && _upper != upper)) 3776 return false; 3777 3778 return true; 3779 } 3780 3781 u32 tipc_sock_get_portid(struct sock *sk) 3782 { 3783 return (sk) ? (tipc_sk(sk))->portid : 0; 3784 } 3785 3786 /** 3787 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3788 * both the rcv and backlog queues are considered 3789 * @sk: tipc sk to be checked 3790 * @skb: tipc msg to be checked 3791 * 3792 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3793 */ 3794 3795 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3796 { 3797 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3798 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3799 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3800 3801 return (qsize > lim * 90 / 100); 3802 } 3803 3804 /** 3805 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3806 * only the rcv queue is considered 3807 * @sk: tipc sk to be checked 3808 * @skb: tipc msg to be checked 3809 * 3810 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3811 */ 3812 3813 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3814 { 3815 unsigned int lim = rcvbuf_limit(sk, skb); 3816 unsigned int qsize = sk_rmem_alloc_get(sk); 3817 3818 return (qsize > lim * 90 / 100); 3819 } 3820 3821 /** 3822 * tipc_sk_dump - dump TIPC socket 3823 * @sk: tipc sk to be dumped 3824 * @dqueues: bitmask to decide if any socket queue to be dumped? 3825 * - TIPC_DUMP_NONE: don't dump socket queues 3826 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3827 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3828 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3829 * - TIPC_DUMP_ALL: dump all the socket queues above 3830 * @buf: returned buffer of dump data in format 3831 */ 3832 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3833 { 3834 int i = 0; 3835 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3836 struct tipc_sock *tsk; 3837 struct publication *p; 3838 bool tsk_connected; 3839 3840 if (!sk) { 3841 i += scnprintf(buf, sz, "sk data: (null)\n"); 3842 return i; 3843 } 3844 3845 tsk = tipc_sk(sk); 3846 tsk_connected = !tipc_sk_type_connectionless(sk); 3847 3848 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3849 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3850 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3851 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3852 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3853 if (tsk_connected) { 3854 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3855 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3856 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type); 3857 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance); 3858 } 3859 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3860 if (tsk->published) { 3861 p = list_first_entry_or_null(&tsk->publications, 3862 struct publication, binding_sock); 3863 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0); 3864 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0); 3865 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0); 3866 } 3867 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3868 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3869 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3870 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3871 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3872 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3873 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3874 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3875 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3876 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3877 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3878 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3879 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3880 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3881 3882 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3883 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3884 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3885 } 3886 3887 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3888 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3889 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3890 } 3891 3892 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 3893 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 3894 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 3895 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 3896 i += scnprintf(buf + i, sz - i, " tail "); 3897 i += tipc_skb_dump(sk->sk_backlog.tail, false, 3898 buf + i); 3899 } 3900 } 3901 3902 return i; 3903 } 3904