1 /* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2007, 2012-2017, Ericsson AB 5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <linux/rhashtable.h> 38 #include <linux/sched/signal.h> 39 40 #include "core.h" 41 #include "name_table.h" 42 #include "node.h" 43 #include "link.h" 44 #include "name_distr.h" 45 #include "socket.h" 46 #include "bcast.h" 47 #include "netlink.h" 48 #include "group.h" 49 #include "trace.h" 50 51 #define NAGLE_START_INIT 4 52 #define NAGLE_START_MAX 1024 53 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 54 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 55 #define TIPC_MAX_PORT 0xffffffff 56 #define TIPC_MIN_PORT 1 57 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */ 58 59 enum { 60 TIPC_LISTEN = TCP_LISTEN, 61 TIPC_ESTABLISHED = TCP_ESTABLISHED, 62 TIPC_OPEN = TCP_CLOSE, 63 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 64 TIPC_CONNECTING = TCP_SYN_SENT, 65 }; 66 67 struct sockaddr_pair { 68 struct sockaddr_tipc sock; 69 struct sockaddr_tipc member; 70 }; 71 72 /** 73 * struct tipc_sock - TIPC socket structure 74 * @sk: socket - interacts with 'port' and with user via the socket API 75 * @conn_type: TIPC type used when connection was established 76 * @conn_instance: TIPC instance used when connection was established 77 * @published: non-zero if port has one or more associated names 78 * @max_pkt: maximum packet size "hint" used when building messages sent by port 79 * @maxnagle: maximum size of msg which can be subject to nagle 80 * @portid: unique port identity in TIPC socket hash table 81 * @phdr: preformatted message header used when sending messages 82 * #cong_links: list of congested links 83 * @publications: list of publications for port 84 * @blocking_link: address of the congested link we are currently sleeping on 85 * @pub_count: total # of publications port has made during its lifetime 86 * @conn_timeout: the time we can wait for an unresponded setup request 87 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 88 * @cong_link_cnt: number of congested links 89 * @snt_unacked: # messages sent by socket, and not yet acked by peer 90 * @rcv_unacked: # messages read by user, but not yet acked back to peer 91 * @peer: 'connected' peer for dgram/rdm 92 * @node: hash table node 93 * @mc_method: cookie for use between socket and broadcast layer 94 * @rcu: rcu struct for tipc_sock 95 */ 96 struct tipc_sock { 97 struct sock sk; 98 u32 conn_type; 99 u32 conn_instance; 100 int published; 101 u32 max_pkt; 102 u32 maxnagle; 103 u32 portid; 104 struct tipc_msg phdr; 105 struct list_head cong_links; 106 struct list_head publications; 107 u32 pub_count; 108 atomic_t dupl_rcvcnt; 109 u16 conn_timeout; 110 bool probe_unacked; 111 u16 cong_link_cnt; 112 u16 snt_unacked; 113 u16 snd_win; 114 u16 peer_caps; 115 u16 rcv_unacked; 116 u16 rcv_win; 117 struct sockaddr_tipc peer; 118 struct rhash_head node; 119 struct tipc_mc_method mc_method; 120 struct rcu_head rcu; 121 struct tipc_group *group; 122 u32 oneway; 123 u32 nagle_start; 124 u16 snd_backlog; 125 u16 msg_acc; 126 u16 pkt_cnt; 127 bool expect_ack; 128 bool nodelay; 129 bool group_is_open; 130 }; 131 132 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 133 static void tipc_data_ready(struct sock *sk); 134 static void tipc_write_space(struct sock *sk); 135 static void tipc_sock_destruct(struct sock *sk); 136 static int tipc_release(struct socket *sock); 137 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 138 bool kern); 139 static void tipc_sk_timeout(struct timer_list *t); 140 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 141 struct tipc_name_seq const *seq); 142 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 143 struct tipc_name_seq const *seq); 144 static int tipc_sk_leave(struct tipc_sock *tsk); 145 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 146 static int tipc_sk_insert(struct tipc_sock *tsk); 147 static void tipc_sk_remove(struct tipc_sock *tsk); 148 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 149 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 150 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 151 152 static const struct proto_ops packet_ops; 153 static const struct proto_ops stream_ops; 154 static const struct proto_ops msg_ops; 155 static struct proto tipc_proto; 156 static const struct rhashtable_params tsk_rht_params; 157 158 static u32 tsk_own_node(struct tipc_sock *tsk) 159 { 160 return msg_prevnode(&tsk->phdr); 161 } 162 163 static u32 tsk_peer_node(struct tipc_sock *tsk) 164 { 165 return msg_destnode(&tsk->phdr); 166 } 167 168 static u32 tsk_peer_port(struct tipc_sock *tsk) 169 { 170 return msg_destport(&tsk->phdr); 171 } 172 173 static bool tsk_unreliable(struct tipc_sock *tsk) 174 { 175 return msg_src_droppable(&tsk->phdr) != 0; 176 } 177 178 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 179 { 180 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 181 } 182 183 static bool tsk_unreturnable(struct tipc_sock *tsk) 184 { 185 return msg_dest_droppable(&tsk->phdr) != 0; 186 } 187 188 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 189 { 190 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 191 } 192 193 static int tsk_importance(struct tipc_sock *tsk) 194 { 195 return msg_importance(&tsk->phdr); 196 } 197 198 static struct tipc_sock *tipc_sk(const struct sock *sk) 199 { 200 return container_of(sk, struct tipc_sock, sk); 201 } 202 203 int tsk_set_importance(struct sock *sk, int imp) 204 { 205 if (imp > TIPC_CRITICAL_IMPORTANCE) 206 return -EINVAL; 207 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 208 return 0; 209 } 210 211 static bool tsk_conn_cong(struct tipc_sock *tsk) 212 { 213 return tsk->snt_unacked > tsk->snd_win; 214 } 215 216 static u16 tsk_blocks(int len) 217 { 218 return ((len / FLOWCTL_BLK_SZ) + 1); 219 } 220 221 /* tsk_blocks(): translate a buffer size in bytes to number of 222 * advertisable blocks, taking into account the ratio truesize(len)/len 223 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 224 */ 225 static u16 tsk_adv_blocks(int len) 226 { 227 return len / FLOWCTL_BLK_SZ / 4; 228 } 229 230 /* tsk_inc(): increment counter for sent or received data 231 * - If block based flow control is not supported by peer we 232 * fall back to message based ditto, incrementing the counter 233 */ 234 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 235 { 236 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 237 return ((msglen / FLOWCTL_BLK_SZ) + 1); 238 return 1; 239 } 240 241 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 242 */ 243 static void tsk_set_nagle(struct tipc_sock *tsk) 244 { 245 struct sock *sk = &tsk->sk; 246 247 tsk->maxnagle = 0; 248 if (sk->sk_type != SOCK_STREAM) 249 return; 250 if (tsk->nodelay) 251 return; 252 if (!(tsk->peer_caps & TIPC_NAGLE)) 253 return; 254 /* Limit node local buffer size to avoid receive queue overflow */ 255 if (tsk->max_pkt == MAX_MSG_SIZE) 256 tsk->maxnagle = 1500; 257 else 258 tsk->maxnagle = tsk->max_pkt; 259 } 260 261 /** 262 * tsk_advance_rx_queue - discard first buffer in socket receive queue 263 * 264 * Caller must hold socket lock 265 */ 266 static void tsk_advance_rx_queue(struct sock *sk) 267 { 268 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 269 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 270 } 271 272 /* tipc_sk_respond() : send response message back to sender 273 */ 274 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 275 { 276 u32 selector; 277 u32 dnode; 278 u32 onode = tipc_own_addr(sock_net(sk)); 279 280 if (!tipc_msg_reverse(onode, &skb, err)) 281 return; 282 283 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 284 dnode = msg_destnode(buf_msg(skb)); 285 selector = msg_origport(buf_msg(skb)); 286 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 287 } 288 289 /** 290 * tsk_rej_rx_queue - reject all buffers in socket receive queue 291 * 292 * Caller must hold socket lock 293 */ 294 static void tsk_rej_rx_queue(struct sock *sk, int error) 295 { 296 struct sk_buff *skb; 297 298 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 299 tipc_sk_respond(sk, skb, error); 300 } 301 302 static bool tipc_sk_connected(struct sock *sk) 303 { 304 return sk->sk_state == TIPC_ESTABLISHED; 305 } 306 307 /* tipc_sk_type_connectionless - check if the socket is datagram socket 308 * @sk: socket 309 * 310 * Returns true if connection less, false otherwise 311 */ 312 static bool tipc_sk_type_connectionless(struct sock *sk) 313 { 314 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 315 } 316 317 /* tsk_peer_msg - verify if message was sent by connected port's peer 318 * 319 * Handles cases where the node's network address has changed from 320 * the default of <0.0.0> to its configured setting. 321 */ 322 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 323 { 324 struct sock *sk = &tsk->sk; 325 u32 self = tipc_own_addr(sock_net(sk)); 326 u32 peer_port = tsk_peer_port(tsk); 327 u32 orig_node, peer_node; 328 329 if (unlikely(!tipc_sk_connected(sk))) 330 return false; 331 332 if (unlikely(msg_origport(msg) != peer_port)) 333 return false; 334 335 orig_node = msg_orignode(msg); 336 peer_node = tsk_peer_node(tsk); 337 338 if (likely(orig_node == peer_node)) 339 return true; 340 341 if (!orig_node && peer_node == self) 342 return true; 343 344 if (!peer_node && orig_node == self) 345 return true; 346 347 return false; 348 } 349 350 /* tipc_set_sk_state - set the sk_state of the socket 351 * @sk: socket 352 * 353 * Caller must hold socket lock 354 * 355 * Returns 0 on success, errno otherwise 356 */ 357 static int tipc_set_sk_state(struct sock *sk, int state) 358 { 359 int oldsk_state = sk->sk_state; 360 int res = -EINVAL; 361 362 switch (state) { 363 case TIPC_OPEN: 364 res = 0; 365 break; 366 case TIPC_LISTEN: 367 case TIPC_CONNECTING: 368 if (oldsk_state == TIPC_OPEN) 369 res = 0; 370 break; 371 case TIPC_ESTABLISHED: 372 if (oldsk_state == TIPC_CONNECTING || 373 oldsk_state == TIPC_OPEN) 374 res = 0; 375 break; 376 case TIPC_DISCONNECTING: 377 if (oldsk_state == TIPC_CONNECTING || 378 oldsk_state == TIPC_ESTABLISHED) 379 res = 0; 380 break; 381 } 382 383 if (!res) 384 sk->sk_state = state; 385 386 return res; 387 } 388 389 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 390 { 391 struct sock *sk = sock->sk; 392 int err = sock_error(sk); 393 int typ = sock->type; 394 395 if (err) 396 return err; 397 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 398 if (sk->sk_state == TIPC_DISCONNECTING) 399 return -EPIPE; 400 else if (!tipc_sk_connected(sk)) 401 return -ENOTCONN; 402 } 403 if (!*timeout) 404 return -EAGAIN; 405 if (signal_pending(current)) 406 return sock_intr_errno(*timeout); 407 408 return 0; 409 } 410 411 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 412 ({ \ 413 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 414 struct sock *sk_; \ 415 int rc_; \ 416 \ 417 while ((rc_ = !(condition_))) { \ 418 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 419 smp_rmb(); \ 420 sk_ = (sock_)->sk; \ 421 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 422 if (rc_) \ 423 break; \ 424 add_wait_queue(sk_sleep(sk_), &wait_); \ 425 release_sock(sk_); \ 426 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 427 sched_annotate_sleep(); \ 428 lock_sock(sk_); \ 429 remove_wait_queue(sk_sleep(sk_), &wait_); \ 430 } \ 431 rc_; \ 432 }) 433 434 /** 435 * tipc_sk_create - create a TIPC socket 436 * @net: network namespace (must be default network) 437 * @sock: pre-allocated socket structure 438 * @protocol: protocol indicator (must be 0) 439 * @kern: caused by kernel or by userspace? 440 * 441 * This routine creates additional data structures used by the TIPC socket, 442 * initializes them, and links them together. 443 * 444 * Returns 0 on success, errno otherwise 445 */ 446 static int tipc_sk_create(struct net *net, struct socket *sock, 447 int protocol, int kern) 448 { 449 const struct proto_ops *ops; 450 struct sock *sk; 451 struct tipc_sock *tsk; 452 struct tipc_msg *msg; 453 454 /* Validate arguments */ 455 if (unlikely(protocol != 0)) 456 return -EPROTONOSUPPORT; 457 458 switch (sock->type) { 459 case SOCK_STREAM: 460 ops = &stream_ops; 461 break; 462 case SOCK_SEQPACKET: 463 ops = &packet_ops; 464 break; 465 case SOCK_DGRAM: 466 case SOCK_RDM: 467 ops = &msg_ops; 468 break; 469 default: 470 return -EPROTOTYPE; 471 } 472 473 /* Allocate socket's protocol area */ 474 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 475 if (sk == NULL) 476 return -ENOMEM; 477 478 tsk = tipc_sk(sk); 479 tsk->max_pkt = MAX_PKT_DEFAULT; 480 tsk->maxnagle = 0; 481 tsk->nagle_start = NAGLE_START_INIT; 482 INIT_LIST_HEAD(&tsk->publications); 483 INIT_LIST_HEAD(&tsk->cong_links); 484 msg = &tsk->phdr; 485 486 /* Finish initializing socket data structures */ 487 sock->ops = ops; 488 sock_init_data(sock, sk); 489 tipc_set_sk_state(sk, TIPC_OPEN); 490 if (tipc_sk_insert(tsk)) { 491 pr_warn("Socket create failed; port number exhausted\n"); 492 return -EINVAL; 493 } 494 495 /* Ensure tsk is visible before we read own_addr. */ 496 smp_mb(); 497 498 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 499 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 500 501 msg_set_origport(msg, tsk->portid); 502 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 503 sk->sk_shutdown = 0; 504 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 505 sk->sk_rcvbuf = sysctl_tipc_rmem[1]; 506 sk->sk_data_ready = tipc_data_ready; 507 sk->sk_write_space = tipc_write_space; 508 sk->sk_destruct = tipc_sock_destruct; 509 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 510 tsk->group_is_open = true; 511 atomic_set(&tsk->dupl_rcvcnt, 0); 512 513 /* Start out with safe limits until we receive an advertised window */ 514 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 515 tsk->rcv_win = tsk->snd_win; 516 517 if (tipc_sk_type_connectionless(sk)) { 518 tsk_set_unreturnable(tsk, true); 519 if (sock->type == SOCK_DGRAM) 520 tsk_set_unreliable(tsk, true); 521 } 522 __skb_queue_head_init(&tsk->mc_method.deferredq); 523 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 524 return 0; 525 } 526 527 static void tipc_sk_callback(struct rcu_head *head) 528 { 529 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 530 531 sock_put(&tsk->sk); 532 } 533 534 /* Caller should hold socket lock for the socket. */ 535 static void __tipc_shutdown(struct socket *sock, int error) 536 { 537 struct sock *sk = sock->sk; 538 struct tipc_sock *tsk = tipc_sk(sk); 539 struct net *net = sock_net(sk); 540 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 541 u32 dnode = tsk_peer_node(tsk); 542 struct sk_buff *skb; 543 544 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 545 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 546 !tsk_conn_cong(tsk))); 547 548 /* Push out delayed messages if in Nagle mode */ 549 tipc_sk_push_backlog(tsk, false); 550 /* Remove pending SYN */ 551 __skb_queue_purge(&sk->sk_write_queue); 552 553 /* Remove partially received buffer if any */ 554 skb = skb_peek(&sk->sk_receive_queue); 555 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 556 __skb_unlink(skb, &sk->sk_receive_queue); 557 kfree_skb(skb); 558 } 559 560 /* Reject all unreceived messages if connectionless */ 561 if (tipc_sk_type_connectionless(sk)) { 562 tsk_rej_rx_queue(sk, error); 563 return; 564 } 565 566 switch (sk->sk_state) { 567 case TIPC_CONNECTING: 568 case TIPC_ESTABLISHED: 569 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 570 tipc_node_remove_conn(net, dnode, tsk->portid); 571 /* Send a FIN+/- to its peer */ 572 skb = __skb_dequeue(&sk->sk_receive_queue); 573 if (skb) { 574 __skb_queue_purge(&sk->sk_receive_queue); 575 tipc_sk_respond(sk, skb, error); 576 break; 577 } 578 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 579 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 580 tsk_own_node(tsk), tsk_peer_port(tsk), 581 tsk->portid, error); 582 if (skb) 583 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 584 break; 585 case TIPC_LISTEN: 586 /* Reject all SYN messages */ 587 tsk_rej_rx_queue(sk, error); 588 break; 589 default: 590 __skb_queue_purge(&sk->sk_receive_queue); 591 break; 592 } 593 } 594 595 /** 596 * tipc_release - destroy a TIPC socket 597 * @sock: socket to destroy 598 * 599 * This routine cleans up any messages that are still queued on the socket. 600 * For DGRAM and RDM socket types, all queued messages are rejected. 601 * For SEQPACKET and STREAM socket types, the first message is rejected 602 * and any others are discarded. (If the first message on a STREAM socket 603 * is partially-read, it is discarded and the next one is rejected instead.) 604 * 605 * NOTE: Rejected messages are not necessarily returned to the sender! They 606 * are returned or discarded according to the "destination droppable" setting 607 * specified for the message by the sender. 608 * 609 * Returns 0 on success, errno otherwise 610 */ 611 static int tipc_release(struct socket *sock) 612 { 613 struct sock *sk = sock->sk; 614 struct tipc_sock *tsk; 615 616 /* 617 * Exit if socket isn't fully initialized (occurs when a failed accept() 618 * releases a pre-allocated child socket that was never used) 619 */ 620 if (sk == NULL) 621 return 0; 622 623 tsk = tipc_sk(sk); 624 lock_sock(sk); 625 626 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 627 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 628 sk->sk_shutdown = SHUTDOWN_MASK; 629 tipc_sk_leave(tsk); 630 tipc_sk_withdraw(tsk, 0, NULL); 631 __skb_queue_purge(&tsk->mc_method.deferredq); 632 sk_stop_timer(sk, &sk->sk_timer); 633 tipc_sk_remove(tsk); 634 635 sock_orphan(sk); 636 /* Reject any messages that accumulated in backlog queue */ 637 release_sock(sk); 638 tipc_dest_list_purge(&tsk->cong_links); 639 tsk->cong_link_cnt = 0; 640 call_rcu(&tsk->rcu, tipc_sk_callback); 641 sock->sk = NULL; 642 643 return 0; 644 } 645 646 /** 647 * tipc_bind - associate or disassocate TIPC name(s) with a socket 648 * @sock: socket structure 649 * @uaddr: socket address describing name(s) and desired operation 650 * @uaddr_len: size of socket address data structure 651 * 652 * Name and name sequence binding is indicated using a positive scope value; 653 * a negative scope value unbinds the specified name. Specifying no name 654 * (i.e. a socket address length of 0) unbinds all names from the socket. 655 * 656 * Returns 0 on success, errno otherwise 657 * 658 * NOTE: This routine doesn't need to take the socket lock since it doesn't 659 * access any non-constant socket information. 660 */ 661 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, 662 int uaddr_len) 663 { 664 struct sock *sk = sock->sk; 665 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 666 struct tipc_sock *tsk = tipc_sk(sk); 667 int res = -EINVAL; 668 669 lock_sock(sk); 670 if (unlikely(!uaddr_len)) { 671 res = tipc_sk_withdraw(tsk, 0, NULL); 672 goto exit; 673 } 674 if (tsk->group) { 675 res = -EACCES; 676 goto exit; 677 } 678 if (uaddr_len < sizeof(struct sockaddr_tipc)) { 679 res = -EINVAL; 680 goto exit; 681 } 682 if (addr->family != AF_TIPC) { 683 res = -EAFNOSUPPORT; 684 goto exit; 685 } 686 687 if (addr->addrtype == TIPC_ADDR_NAME) 688 addr->addr.nameseq.upper = addr->addr.nameseq.lower; 689 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { 690 res = -EAFNOSUPPORT; 691 goto exit; 692 } 693 694 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && 695 (addr->addr.nameseq.type != TIPC_TOP_SRV) && 696 (addr->addr.nameseq.type != TIPC_CFG_SRV)) { 697 res = -EACCES; 698 goto exit; 699 } 700 701 res = (addr->scope >= 0) ? 702 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) : 703 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq); 704 exit: 705 release_sock(sk); 706 return res; 707 } 708 709 /** 710 * tipc_getname - get port ID of socket or peer socket 711 * @sock: socket structure 712 * @uaddr: area for returned socket address 713 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 714 * 715 * Returns 0 on success, errno otherwise 716 * 717 * NOTE: This routine doesn't need to take the socket lock since it only 718 * accesses socket information that is unchanging (or which changes in 719 * a completely predictable manner). 720 */ 721 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 722 int peer) 723 { 724 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 725 struct sock *sk = sock->sk; 726 struct tipc_sock *tsk = tipc_sk(sk); 727 728 memset(addr, 0, sizeof(*addr)); 729 if (peer) { 730 if ((!tipc_sk_connected(sk)) && 731 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 732 return -ENOTCONN; 733 addr->addr.id.ref = tsk_peer_port(tsk); 734 addr->addr.id.node = tsk_peer_node(tsk); 735 } else { 736 addr->addr.id.ref = tsk->portid; 737 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 738 } 739 740 addr->addrtype = TIPC_ADDR_ID; 741 addr->family = AF_TIPC; 742 addr->scope = 0; 743 addr->addr.name.domain = 0; 744 745 return sizeof(*addr); 746 } 747 748 /** 749 * tipc_poll - read and possibly block on pollmask 750 * @file: file structure associated with the socket 751 * @sock: socket for which to calculate the poll bits 752 * @wait: ??? 753 * 754 * Returns pollmask value 755 * 756 * COMMENTARY: 757 * It appears that the usual socket locking mechanisms are not useful here 758 * since the pollmask info is potentially out-of-date the moment this routine 759 * exits. TCP and other protocols seem to rely on higher level poll routines 760 * to handle any preventable race conditions, so TIPC will do the same ... 761 * 762 * IMPORTANT: The fact that a read or write operation is indicated does NOT 763 * imply that the operation will succeed, merely that it should be performed 764 * and will not block. 765 */ 766 static __poll_t tipc_poll(struct file *file, struct socket *sock, 767 poll_table *wait) 768 { 769 struct sock *sk = sock->sk; 770 struct tipc_sock *tsk = tipc_sk(sk); 771 __poll_t revents = 0; 772 773 sock_poll_wait(file, sock, wait); 774 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 775 776 if (sk->sk_shutdown & RCV_SHUTDOWN) 777 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 778 if (sk->sk_shutdown == SHUTDOWN_MASK) 779 revents |= EPOLLHUP; 780 781 switch (sk->sk_state) { 782 case TIPC_ESTABLISHED: 783 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 784 revents |= EPOLLOUT; 785 fallthrough; 786 case TIPC_LISTEN: 787 case TIPC_CONNECTING: 788 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 789 revents |= EPOLLIN | EPOLLRDNORM; 790 break; 791 case TIPC_OPEN: 792 if (tsk->group_is_open && !tsk->cong_link_cnt) 793 revents |= EPOLLOUT; 794 if (!tipc_sk_type_connectionless(sk)) 795 break; 796 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 797 break; 798 revents |= EPOLLIN | EPOLLRDNORM; 799 break; 800 case TIPC_DISCONNECTING: 801 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 802 break; 803 } 804 return revents; 805 } 806 807 /** 808 * tipc_sendmcast - send multicast message 809 * @sock: socket structure 810 * @seq: destination address 811 * @msg: message to send 812 * @dlen: length of data to send 813 * @timeout: timeout to wait for wakeup 814 * 815 * Called from function tipc_sendmsg(), which has done all sanity checks 816 * Returns the number of bytes sent on success, or errno 817 */ 818 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, 819 struct msghdr *msg, size_t dlen, long timeout) 820 { 821 struct sock *sk = sock->sk; 822 struct tipc_sock *tsk = tipc_sk(sk); 823 struct tipc_msg *hdr = &tsk->phdr; 824 struct net *net = sock_net(sk); 825 int mtu = tipc_bcast_get_mtu(net); 826 struct tipc_mc_method *method = &tsk->mc_method; 827 struct sk_buff_head pkts; 828 struct tipc_nlist dsts; 829 int rc; 830 831 if (tsk->group) 832 return -EACCES; 833 834 /* Block or return if any destination link is congested */ 835 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 836 if (unlikely(rc)) 837 return rc; 838 839 /* Lookup destination nodes */ 840 tipc_nlist_init(&dsts, tipc_own_addr(net)); 841 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower, 842 seq->upper, &dsts); 843 if (!dsts.local && !dsts.remote) 844 return -EHOSTUNREACH; 845 846 /* Build message header */ 847 msg_set_type(hdr, TIPC_MCAST_MSG); 848 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 849 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 850 msg_set_destport(hdr, 0); 851 msg_set_destnode(hdr, 0); 852 msg_set_nametype(hdr, seq->type); 853 msg_set_namelower(hdr, seq->lower); 854 msg_set_nameupper(hdr, seq->upper); 855 856 /* Build message as chain of buffers */ 857 __skb_queue_head_init(&pkts); 858 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 859 860 /* Send message if build was successful */ 861 if (unlikely(rc == dlen)) { 862 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 863 TIPC_DUMP_SK_SNDQ, " "); 864 rc = tipc_mcast_xmit(net, &pkts, method, &dsts, 865 &tsk->cong_link_cnt); 866 } 867 868 tipc_nlist_purge(&dsts); 869 870 return rc ? rc : dlen; 871 } 872 873 /** 874 * tipc_send_group_msg - send a message to a member in the group 875 * @net: network namespace 876 * @m: message to send 877 * @mb: group member 878 * @dnode: destination node 879 * @dport: destination port 880 * @dlen: total length of message data 881 */ 882 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 883 struct msghdr *m, struct tipc_member *mb, 884 u32 dnode, u32 dport, int dlen) 885 { 886 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 887 struct tipc_mc_method *method = &tsk->mc_method; 888 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 889 struct tipc_msg *hdr = &tsk->phdr; 890 struct sk_buff_head pkts; 891 int mtu, rc; 892 893 /* Complete message header */ 894 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 895 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 896 msg_set_destport(hdr, dport); 897 msg_set_destnode(hdr, dnode); 898 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 899 900 /* Build message as chain of buffers */ 901 __skb_queue_head_init(&pkts); 902 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 903 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 904 if (unlikely(rc != dlen)) 905 return rc; 906 907 /* Send message */ 908 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 909 if (unlikely(rc == -ELINKCONG)) { 910 tipc_dest_push(&tsk->cong_links, dnode, 0); 911 tsk->cong_link_cnt++; 912 } 913 914 /* Update send window */ 915 tipc_group_update_member(mb, blks); 916 917 /* A broadcast sent within next EXPIRE period must follow same path */ 918 method->rcast = true; 919 method->mandatory = true; 920 return dlen; 921 } 922 923 /** 924 * tipc_send_group_unicast - send message to a member in the group 925 * @sock: socket structure 926 * @m: message to send 927 * @dlen: total length of message data 928 * @timeout: timeout to wait for wakeup 929 * 930 * Called from function tipc_sendmsg(), which has done all sanity checks 931 * Returns the number of bytes sent on success, or errno 932 */ 933 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 934 int dlen, long timeout) 935 { 936 struct sock *sk = sock->sk; 937 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 938 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 939 struct tipc_sock *tsk = tipc_sk(sk); 940 struct net *net = sock_net(sk); 941 struct tipc_member *mb = NULL; 942 u32 node, port; 943 int rc; 944 945 node = dest->addr.id.node; 946 port = dest->addr.id.ref; 947 if (!port && !node) 948 return -EHOSTUNREACH; 949 950 /* Block or return if destination link or member is congested */ 951 rc = tipc_wait_for_cond(sock, &timeout, 952 !tipc_dest_find(&tsk->cong_links, node, 0) && 953 tsk->group && 954 !tipc_group_cong(tsk->group, node, port, blks, 955 &mb)); 956 if (unlikely(rc)) 957 return rc; 958 959 if (unlikely(!mb)) 960 return -EHOSTUNREACH; 961 962 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 963 964 return rc ? rc : dlen; 965 } 966 967 /** 968 * tipc_send_group_anycast - send message to any member with given identity 969 * @sock: socket structure 970 * @m: message to send 971 * @dlen: total length of message data 972 * @timeout: timeout to wait for wakeup 973 * 974 * Called from function tipc_sendmsg(), which has done all sanity checks 975 * Returns the number of bytes sent on success, or errno 976 */ 977 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 978 int dlen, long timeout) 979 { 980 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 981 struct sock *sk = sock->sk; 982 struct tipc_sock *tsk = tipc_sk(sk); 983 struct list_head *cong_links = &tsk->cong_links; 984 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 985 struct tipc_msg *hdr = &tsk->phdr; 986 struct tipc_member *first = NULL; 987 struct tipc_member *mbr = NULL; 988 struct net *net = sock_net(sk); 989 u32 node, port, exclude; 990 struct list_head dsts; 991 u32 type, inst, scope; 992 int lookups = 0; 993 int dstcnt, rc; 994 bool cong; 995 996 INIT_LIST_HEAD(&dsts); 997 998 type = msg_nametype(hdr); 999 inst = dest->addr.name.name.instance; 1000 scope = msg_lookup_scope(hdr); 1001 1002 while (++lookups < 4) { 1003 exclude = tipc_group_exclude(tsk->group); 1004 1005 first = NULL; 1006 1007 /* Look for a non-congested destination member, if any */ 1008 while (1) { 1009 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 1010 &dstcnt, exclude, false)) 1011 return -EHOSTUNREACH; 1012 tipc_dest_pop(&dsts, &node, &port); 1013 cong = tipc_group_cong(tsk->group, node, port, blks, 1014 &mbr); 1015 if (!cong) 1016 break; 1017 if (mbr == first) 1018 break; 1019 if (!first) 1020 first = mbr; 1021 } 1022 1023 /* Start over if destination was not in member list */ 1024 if (unlikely(!mbr)) 1025 continue; 1026 1027 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1028 break; 1029 1030 /* Block or return if destination link or member is congested */ 1031 rc = tipc_wait_for_cond(sock, &timeout, 1032 !tipc_dest_find(cong_links, node, 0) && 1033 tsk->group && 1034 !tipc_group_cong(tsk->group, node, port, 1035 blks, &mbr)); 1036 if (unlikely(rc)) 1037 return rc; 1038 1039 /* Send, unless destination disappeared while waiting */ 1040 if (likely(mbr)) 1041 break; 1042 } 1043 1044 if (unlikely(lookups >= 4)) 1045 return -EHOSTUNREACH; 1046 1047 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1048 1049 return rc ? rc : dlen; 1050 } 1051 1052 /** 1053 * tipc_send_group_bcast - send message to all members in communication group 1054 * @sock: socket structure 1055 * @m: message to send 1056 * @dlen: total length of message data 1057 * @timeout: timeout to wait for wakeup 1058 * 1059 * Called from function tipc_sendmsg(), which has done all sanity checks 1060 * Returns the number of bytes sent on success, or errno 1061 */ 1062 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1063 int dlen, long timeout) 1064 { 1065 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1066 struct sock *sk = sock->sk; 1067 struct net *net = sock_net(sk); 1068 struct tipc_sock *tsk = tipc_sk(sk); 1069 struct tipc_nlist *dsts; 1070 struct tipc_mc_method *method = &tsk->mc_method; 1071 bool ack = method->mandatory && method->rcast; 1072 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1073 struct tipc_msg *hdr = &tsk->phdr; 1074 int mtu = tipc_bcast_get_mtu(net); 1075 struct sk_buff_head pkts; 1076 int rc = -EHOSTUNREACH; 1077 1078 /* Block or return if any destination link or member is congested */ 1079 rc = tipc_wait_for_cond(sock, &timeout, 1080 !tsk->cong_link_cnt && tsk->group && 1081 !tipc_group_bc_cong(tsk->group, blks)); 1082 if (unlikely(rc)) 1083 return rc; 1084 1085 dsts = tipc_group_dests(tsk->group); 1086 if (!dsts->local && !dsts->remote) 1087 return -EHOSTUNREACH; 1088 1089 /* Complete message header */ 1090 if (dest) { 1091 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1092 msg_set_nameinst(hdr, dest->addr.name.name.instance); 1093 } else { 1094 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1095 msg_set_nameinst(hdr, 0); 1096 } 1097 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1098 msg_set_destport(hdr, 0); 1099 msg_set_destnode(hdr, 0); 1100 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1101 1102 /* Avoid getting stuck with repeated forced replicasts */ 1103 msg_set_grp_bc_ack_req(hdr, ack); 1104 1105 /* Build message as chain of buffers */ 1106 __skb_queue_head_init(&pkts); 1107 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1108 if (unlikely(rc != dlen)) 1109 return rc; 1110 1111 /* Send message */ 1112 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1113 if (unlikely(rc)) 1114 return rc; 1115 1116 /* Update broadcast sequence number and send windows */ 1117 tipc_group_update_bc_members(tsk->group, blks, ack); 1118 1119 /* Broadcast link is now free to choose method for next broadcast */ 1120 method->mandatory = false; 1121 method->expires = jiffies; 1122 1123 return dlen; 1124 } 1125 1126 /** 1127 * tipc_send_group_mcast - send message to all members with given identity 1128 * @sock: socket structure 1129 * @m: message to send 1130 * @dlen: total length of message data 1131 * @timeout: timeout to wait for wakeup 1132 * 1133 * Called from function tipc_sendmsg(), which has done all sanity checks 1134 * Returns the number of bytes sent on success, or errno 1135 */ 1136 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1137 int dlen, long timeout) 1138 { 1139 struct sock *sk = sock->sk; 1140 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1141 struct tipc_sock *tsk = tipc_sk(sk); 1142 struct tipc_group *grp = tsk->group; 1143 struct tipc_msg *hdr = &tsk->phdr; 1144 struct net *net = sock_net(sk); 1145 u32 type, inst, scope, exclude; 1146 struct list_head dsts; 1147 u32 dstcnt; 1148 1149 INIT_LIST_HEAD(&dsts); 1150 1151 type = msg_nametype(hdr); 1152 inst = dest->addr.name.name.instance; 1153 scope = msg_lookup_scope(hdr); 1154 exclude = tipc_group_exclude(grp); 1155 1156 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 1157 &dstcnt, exclude, true)) 1158 return -EHOSTUNREACH; 1159 1160 if (dstcnt == 1) { 1161 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref); 1162 return tipc_send_group_unicast(sock, m, dlen, timeout); 1163 } 1164 1165 tipc_dest_list_purge(&dsts); 1166 return tipc_send_group_bcast(sock, m, dlen, timeout); 1167 } 1168 1169 /** 1170 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1171 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1172 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1173 * 1174 * Multi-threaded: parallel calls with reference to same queues may occur 1175 */ 1176 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1177 struct sk_buff_head *inputq) 1178 { 1179 u32 self = tipc_own_addr(net); 1180 u32 type, lower, upper, scope; 1181 struct sk_buff *skb, *_skb; 1182 u32 portid, onode; 1183 struct sk_buff_head tmpq; 1184 struct list_head dports; 1185 struct tipc_msg *hdr; 1186 int user, mtyp, hlen; 1187 bool exact; 1188 1189 __skb_queue_head_init(&tmpq); 1190 INIT_LIST_HEAD(&dports); 1191 1192 skb = tipc_skb_peek(arrvq, &inputq->lock); 1193 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1194 hdr = buf_msg(skb); 1195 user = msg_user(hdr); 1196 mtyp = msg_type(hdr); 1197 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1198 onode = msg_orignode(hdr); 1199 type = msg_nametype(hdr); 1200 1201 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1202 spin_lock_bh(&inputq->lock); 1203 if (skb_peek(arrvq) == skb) { 1204 __skb_dequeue(arrvq); 1205 __skb_queue_tail(inputq, skb); 1206 } 1207 kfree_skb(skb); 1208 spin_unlock_bh(&inputq->lock); 1209 continue; 1210 } 1211 1212 /* Group messages require exact scope match */ 1213 if (msg_in_group(hdr)) { 1214 lower = 0; 1215 upper = ~0; 1216 scope = msg_lookup_scope(hdr); 1217 exact = true; 1218 } else { 1219 /* TIPC_NODE_SCOPE means "any scope" in this context */ 1220 if (onode == self) 1221 scope = TIPC_NODE_SCOPE; 1222 else 1223 scope = TIPC_CLUSTER_SCOPE; 1224 exact = false; 1225 lower = msg_namelower(hdr); 1226 upper = msg_nameupper(hdr); 1227 } 1228 1229 /* Create destination port list: */ 1230 tipc_nametbl_mc_lookup(net, type, lower, upper, 1231 scope, exact, &dports); 1232 1233 /* Clone message per destination */ 1234 while (tipc_dest_pop(&dports, NULL, &portid)) { 1235 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1236 if (_skb) { 1237 msg_set_destport(buf_msg(_skb), portid); 1238 __skb_queue_tail(&tmpq, _skb); 1239 continue; 1240 } 1241 pr_warn("Failed to clone mcast rcv buffer\n"); 1242 } 1243 /* Append to inputq if not already done by other thread */ 1244 spin_lock_bh(&inputq->lock); 1245 if (skb_peek(arrvq) == skb) { 1246 skb_queue_splice_tail_init(&tmpq, inputq); 1247 kfree_skb(__skb_dequeue(arrvq)); 1248 } 1249 spin_unlock_bh(&inputq->lock); 1250 __skb_queue_purge(&tmpq); 1251 kfree_skb(skb); 1252 } 1253 tipc_sk_rcv(net, inputq); 1254 } 1255 1256 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1257 * when socket is in Nagle mode 1258 */ 1259 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1260 { 1261 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1262 struct sk_buff *skb = skb_peek_tail(txq); 1263 struct net *net = sock_net(&tsk->sk); 1264 u32 dnode = tsk_peer_node(tsk); 1265 int rc; 1266 1267 if (nagle_ack) { 1268 tsk->pkt_cnt += skb_queue_len(txq); 1269 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1270 tsk->oneway = 0; 1271 if (tsk->nagle_start < NAGLE_START_MAX) 1272 tsk->nagle_start *= 2; 1273 tsk->expect_ack = false; 1274 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1275 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1276 tsk->nagle_start); 1277 } else { 1278 tsk->nagle_start = NAGLE_START_INIT; 1279 if (skb) { 1280 msg_set_ack_required(buf_msg(skb)); 1281 tsk->expect_ack = true; 1282 } else { 1283 tsk->expect_ack = false; 1284 } 1285 } 1286 tsk->msg_acc = 0; 1287 tsk->pkt_cnt = 0; 1288 } 1289 1290 if (!skb || tsk->cong_link_cnt) 1291 return; 1292 1293 /* Do not send SYN again after congestion */ 1294 if (msg_is_syn(buf_msg(skb))) 1295 return; 1296 1297 if (tsk->msg_acc) 1298 tsk->pkt_cnt += skb_queue_len(txq); 1299 tsk->snt_unacked += tsk->snd_backlog; 1300 tsk->snd_backlog = 0; 1301 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1302 if (rc == -ELINKCONG) 1303 tsk->cong_link_cnt = 1; 1304 } 1305 1306 /** 1307 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1308 * @tsk: receiving socket 1309 * @skb: pointer to message buffer. 1310 */ 1311 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1312 struct sk_buff_head *inputq, 1313 struct sk_buff_head *xmitq) 1314 { 1315 struct tipc_msg *hdr = buf_msg(skb); 1316 u32 onode = tsk_own_node(tsk); 1317 struct sock *sk = &tsk->sk; 1318 int mtyp = msg_type(hdr); 1319 bool was_cong; 1320 1321 /* Ignore if connection cannot be validated: */ 1322 if (!tsk_peer_msg(tsk, hdr)) { 1323 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1324 goto exit; 1325 } 1326 1327 if (unlikely(msg_errcode(hdr))) { 1328 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1329 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1330 tsk_peer_port(tsk)); 1331 sk->sk_state_change(sk); 1332 1333 /* State change is ignored if socket already awake, 1334 * - convert msg to abort msg and add to inqueue 1335 */ 1336 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1337 msg_set_type(hdr, TIPC_CONN_MSG); 1338 msg_set_size(hdr, BASIC_H_SIZE); 1339 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1340 __skb_queue_tail(inputq, skb); 1341 return; 1342 } 1343 1344 tsk->probe_unacked = false; 1345 1346 if (mtyp == CONN_PROBE) { 1347 msg_set_type(hdr, CONN_PROBE_REPLY); 1348 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1349 __skb_queue_tail(xmitq, skb); 1350 return; 1351 } else if (mtyp == CONN_ACK) { 1352 was_cong = tsk_conn_cong(tsk); 1353 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1354 tsk->snt_unacked -= msg_conn_ack(hdr); 1355 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1356 tsk->snd_win = msg_adv_win(hdr); 1357 if (was_cong && !tsk_conn_cong(tsk)) 1358 sk->sk_write_space(sk); 1359 } else if (mtyp != CONN_PROBE_REPLY) { 1360 pr_warn("Received unknown CONN_PROTO msg\n"); 1361 } 1362 exit: 1363 kfree_skb(skb); 1364 } 1365 1366 /** 1367 * tipc_sendmsg - send message in connectionless manner 1368 * @sock: socket structure 1369 * @m: message to send 1370 * @dsz: amount of user data to be sent 1371 * 1372 * Message must have an destination specified explicitly. 1373 * Used for SOCK_RDM and SOCK_DGRAM messages, 1374 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1375 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1376 * 1377 * Returns the number of bytes sent on success, or errno otherwise 1378 */ 1379 static int tipc_sendmsg(struct socket *sock, 1380 struct msghdr *m, size_t dsz) 1381 { 1382 struct sock *sk = sock->sk; 1383 int ret; 1384 1385 lock_sock(sk); 1386 ret = __tipc_sendmsg(sock, m, dsz); 1387 release_sock(sk); 1388 1389 return ret; 1390 } 1391 1392 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1393 { 1394 struct sock *sk = sock->sk; 1395 struct net *net = sock_net(sk); 1396 struct tipc_sock *tsk = tipc_sk(sk); 1397 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1398 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1399 struct list_head *clinks = &tsk->cong_links; 1400 bool syn = !tipc_sk_type_connectionless(sk); 1401 struct tipc_group *grp = tsk->group; 1402 struct tipc_msg *hdr = &tsk->phdr; 1403 struct tipc_name_seq *seq; 1404 struct sk_buff_head pkts; 1405 u32 dport = 0, dnode = 0; 1406 u32 type = 0, inst = 0; 1407 int mtu, rc; 1408 1409 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1410 return -EMSGSIZE; 1411 1412 if (likely(dest)) { 1413 if (unlikely(m->msg_namelen < sizeof(*dest))) 1414 return -EINVAL; 1415 if (unlikely(dest->family != AF_TIPC)) 1416 return -EINVAL; 1417 } 1418 1419 if (grp) { 1420 if (!dest) 1421 return tipc_send_group_bcast(sock, m, dlen, timeout); 1422 if (dest->addrtype == TIPC_ADDR_NAME) 1423 return tipc_send_group_anycast(sock, m, dlen, timeout); 1424 if (dest->addrtype == TIPC_ADDR_ID) 1425 return tipc_send_group_unicast(sock, m, dlen, timeout); 1426 if (dest->addrtype == TIPC_ADDR_MCAST) 1427 return tipc_send_group_mcast(sock, m, dlen, timeout); 1428 return -EINVAL; 1429 } 1430 1431 if (unlikely(!dest)) { 1432 dest = &tsk->peer; 1433 if (!syn && dest->family != AF_TIPC) 1434 return -EDESTADDRREQ; 1435 } 1436 1437 if (unlikely(syn)) { 1438 if (sk->sk_state == TIPC_LISTEN) 1439 return -EPIPE; 1440 if (sk->sk_state != TIPC_OPEN) 1441 return -EISCONN; 1442 if (tsk->published) 1443 return -EOPNOTSUPP; 1444 if (dest->addrtype == TIPC_ADDR_NAME) { 1445 tsk->conn_type = dest->addr.name.name.type; 1446 tsk->conn_instance = dest->addr.name.name.instance; 1447 } 1448 msg_set_syn(hdr, 1); 1449 } 1450 1451 seq = &dest->addr.nameseq; 1452 if (dest->addrtype == TIPC_ADDR_MCAST) 1453 return tipc_sendmcast(sock, seq, m, dlen, timeout); 1454 1455 if (dest->addrtype == TIPC_ADDR_NAME) { 1456 type = dest->addr.name.name.type; 1457 inst = dest->addr.name.name.instance; 1458 dnode = dest->addr.name.domain; 1459 dport = tipc_nametbl_translate(net, type, inst, &dnode); 1460 if (unlikely(!dport && !dnode)) 1461 return -EHOSTUNREACH; 1462 } else if (dest->addrtype == TIPC_ADDR_ID) { 1463 dnode = dest->addr.id.node; 1464 } else { 1465 return -EINVAL; 1466 } 1467 1468 /* Block or return if destination link is congested */ 1469 rc = tipc_wait_for_cond(sock, &timeout, 1470 !tipc_dest_find(clinks, dnode, 0)); 1471 if (unlikely(rc)) 1472 return rc; 1473 1474 if (dest->addrtype == TIPC_ADDR_NAME) { 1475 msg_set_type(hdr, TIPC_NAMED_MSG); 1476 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1477 msg_set_nametype(hdr, type); 1478 msg_set_nameinst(hdr, inst); 1479 msg_set_lookup_scope(hdr, tipc_node2scope(dnode)); 1480 msg_set_destnode(hdr, dnode); 1481 msg_set_destport(hdr, dport); 1482 } else { /* TIPC_ADDR_ID */ 1483 msg_set_type(hdr, TIPC_DIRECT_MSG); 1484 msg_set_lookup_scope(hdr, 0); 1485 msg_set_destnode(hdr, dnode); 1486 msg_set_destport(hdr, dest->addr.id.ref); 1487 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1488 } 1489 1490 __skb_queue_head_init(&pkts); 1491 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, true); 1492 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1493 if (unlikely(rc != dlen)) 1494 return rc; 1495 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1496 __skb_queue_purge(&pkts); 1497 return -ENOMEM; 1498 } 1499 1500 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1501 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 1502 if (unlikely(rc == -ELINKCONG)) { 1503 tipc_dest_push(clinks, dnode, 0); 1504 tsk->cong_link_cnt++; 1505 rc = 0; 1506 } 1507 1508 if (unlikely(syn && !rc)) 1509 tipc_set_sk_state(sk, TIPC_CONNECTING); 1510 1511 return rc ? rc : dlen; 1512 } 1513 1514 /** 1515 * tipc_sendstream - send stream-oriented data 1516 * @sock: socket structure 1517 * @m: data to send 1518 * @dsz: total length of data to be transmitted 1519 * 1520 * Used for SOCK_STREAM data. 1521 * 1522 * Returns the number of bytes sent on success (or partial success), 1523 * or errno if no data sent 1524 */ 1525 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1526 { 1527 struct sock *sk = sock->sk; 1528 int ret; 1529 1530 lock_sock(sk); 1531 ret = __tipc_sendstream(sock, m, dsz); 1532 release_sock(sk); 1533 1534 return ret; 1535 } 1536 1537 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1538 { 1539 struct sock *sk = sock->sk; 1540 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1541 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1542 struct sk_buff_head *txq = &sk->sk_write_queue; 1543 struct tipc_sock *tsk = tipc_sk(sk); 1544 struct tipc_msg *hdr = &tsk->phdr; 1545 struct net *net = sock_net(sk); 1546 struct sk_buff *skb; 1547 u32 dnode = tsk_peer_node(tsk); 1548 int maxnagle = tsk->maxnagle; 1549 int maxpkt = tsk->max_pkt; 1550 int send, sent = 0; 1551 int blocks, rc = 0; 1552 1553 if (unlikely(dlen > INT_MAX)) 1554 return -EMSGSIZE; 1555 1556 /* Handle implicit connection setup */ 1557 if (unlikely(dest)) { 1558 rc = __tipc_sendmsg(sock, m, dlen); 1559 if (dlen && dlen == rc) { 1560 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1561 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1562 } 1563 return rc; 1564 } 1565 1566 do { 1567 rc = tipc_wait_for_cond(sock, &timeout, 1568 (!tsk->cong_link_cnt && 1569 !tsk_conn_cong(tsk) && 1570 tipc_sk_connected(sk))); 1571 if (unlikely(rc)) 1572 break; 1573 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1574 blocks = tsk->snd_backlog; 1575 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1576 send <= maxnagle) { 1577 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1578 if (unlikely(rc < 0)) 1579 break; 1580 blocks += rc; 1581 tsk->msg_acc++; 1582 if (blocks <= 64 && tsk->expect_ack) { 1583 tsk->snd_backlog = blocks; 1584 sent += send; 1585 break; 1586 } else if (blocks > 64) { 1587 tsk->pkt_cnt += skb_queue_len(txq); 1588 } else { 1589 skb = skb_peek_tail(txq); 1590 if (skb) { 1591 msg_set_ack_required(buf_msg(skb)); 1592 tsk->expect_ack = true; 1593 } else { 1594 tsk->expect_ack = false; 1595 } 1596 tsk->msg_acc = 0; 1597 tsk->pkt_cnt = 0; 1598 } 1599 } else { 1600 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1601 if (unlikely(rc != send)) 1602 break; 1603 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1604 } 1605 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1606 TIPC_DUMP_SK_SNDQ, " "); 1607 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1608 if (unlikely(rc == -ELINKCONG)) { 1609 tsk->cong_link_cnt = 1; 1610 rc = 0; 1611 } 1612 if (likely(!rc)) { 1613 tsk->snt_unacked += blocks; 1614 tsk->snd_backlog = 0; 1615 sent += send; 1616 } 1617 } while (sent < dlen && !rc); 1618 1619 return sent ? sent : rc; 1620 } 1621 1622 /** 1623 * tipc_send_packet - send a connection-oriented message 1624 * @sock: socket structure 1625 * @m: message to send 1626 * @dsz: length of data to be transmitted 1627 * 1628 * Used for SOCK_SEQPACKET messages. 1629 * 1630 * Returns the number of bytes sent on success, or errno otherwise 1631 */ 1632 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1633 { 1634 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1635 return -EMSGSIZE; 1636 1637 return tipc_sendstream(sock, m, dsz); 1638 } 1639 1640 /* tipc_sk_finish_conn - complete the setup of a connection 1641 */ 1642 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1643 u32 peer_node) 1644 { 1645 struct sock *sk = &tsk->sk; 1646 struct net *net = sock_net(sk); 1647 struct tipc_msg *msg = &tsk->phdr; 1648 1649 msg_set_syn(msg, 0); 1650 msg_set_destnode(msg, peer_node); 1651 msg_set_destport(msg, peer_port); 1652 msg_set_type(msg, TIPC_CONN_MSG); 1653 msg_set_lookup_scope(msg, 0); 1654 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1655 1656 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1657 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1658 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1659 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1660 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1661 tsk_set_nagle(tsk); 1662 __skb_queue_purge(&sk->sk_write_queue); 1663 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1664 return; 1665 1666 /* Fall back to message based flow control */ 1667 tsk->rcv_win = FLOWCTL_MSG_WIN; 1668 tsk->snd_win = FLOWCTL_MSG_WIN; 1669 } 1670 1671 /** 1672 * tipc_sk_set_orig_addr - capture sender's address for received message 1673 * @m: descriptor for message info 1674 * @skb: received message 1675 * 1676 * Note: Address is not captured if not requested by receiver. 1677 */ 1678 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1679 { 1680 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1681 struct tipc_msg *hdr = buf_msg(skb); 1682 1683 if (!srcaddr) 1684 return; 1685 1686 srcaddr->sock.family = AF_TIPC; 1687 srcaddr->sock.addrtype = TIPC_ADDR_ID; 1688 srcaddr->sock.scope = 0; 1689 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1690 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1691 srcaddr->sock.addr.name.domain = 0; 1692 m->msg_namelen = sizeof(struct sockaddr_tipc); 1693 1694 if (!msg_in_group(hdr)) 1695 return; 1696 1697 /* Group message users may also want to know sending member's id */ 1698 srcaddr->member.family = AF_TIPC; 1699 srcaddr->member.addrtype = TIPC_ADDR_NAME; 1700 srcaddr->member.scope = 0; 1701 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1702 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1703 srcaddr->member.addr.name.domain = 0; 1704 m->msg_namelen = sizeof(*srcaddr); 1705 } 1706 1707 /** 1708 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1709 * @m: descriptor for message info 1710 * @skb: received message buffer 1711 * @tsk: TIPC port associated with message 1712 * 1713 * Note: Ancillary data is not captured if not requested by receiver. 1714 * 1715 * Returns 0 if successful, otherwise errno 1716 */ 1717 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1718 struct tipc_sock *tsk) 1719 { 1720 struct tipc_msg *msg; 1721 u32 anc_data[3]; 1722 u32 err; 1723 u32 dest_type; 1724 int has_name; 1725 int res; 1726 1727 if (likely(m->msg_controllen == 0)) 1728 return 0; 1729 msg = buf_msg(skb); 1730 1731 /* Optionally capture errored message object(s) */ 1732 err = msg ? msg_errcode(msg) : 0; 1733 if (unlikely(err)) { 1734 anc_data[0] = err; 1735 anc_data[1] = msg_data_sz(msg); 1736 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); 1737 if (res) 1738 return res; 1739 if (anc_data[1]) { 1740 if (skb_linearize(skb)) 1741 return -ENOMEM; 1742 msg = buf_msg(skb); 1743 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], 1744 msg_data(msg)); 1745 if (res) 1746 return res; 1747 } 1748 } 1749 1750 /* Optionally capture message destination object */ 1751 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 1752 switch (dest_type) { 1753 case TIPC_NAMED_MSG: 1754 has_name = 1; 1755 anc_data[0] = msg_nametype(msg); 1756 anc_data[1] = msg_namelower(msg); 1757 anc_data[2] = msg_namelower(msg); 1758 break; 1759 case TIPC_MCAST_MSG: 1760 has_name = 1; 1761 anc_data[0] = msg_nametype(msg); 1762 anc_data[1] = msg_namelower(msg); 1763 anc_data[2] = msg_nameupper(msg); 1764 break; 1765 case TIPC_CONN_MSG: 1766 has_name = (tsk->conn_type != 0); 1767 anc_data[0] = tsk->conn_type; 1768 anc_data[1] = tsk->conn_instance; 1769 anc_data[2] = tsk->conn_instance; 1770 break; 1771 default: 1772 has_name = 0; 1773 } 1774 if (has_name) { 1775 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); 1776 if (res) 1777 return res; 1778 } 1779 1780 return 0; 1781 } 1782 1783 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1784 { 1785 struct sock *sk = &tsk->sk; 1786 struct sk_buff *skb = NULL; 1787 struct tipc_msg *msg; 1788 u32 peer_port = tsk_peer_port(tsk); 1789 u32 dnode = tsk_peer_node(tsk); 1790 1791 if (!tipc_sk_connected(sk)) 1792 return NULL; 1793 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1794 dnode, tsk_own_node(tsk), peer_port, 1795 tsk->portid, TIPC_OK); 1796 if (!skb) 1797 return NULL; 1798 msg = buf_msg(skb); 1799 msg_set_conn_ack(msg, tsk->rcv_unacked); 1800 tsk->rcv_unacked = 0; 1801 1802 /* Adjust to and advertize the correct window limit */ 1803 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1804 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1805 msg_set_adv_win(msg, tsk->rcv_win); 1806 } 1807 return skb; 1808 } 1809 1810 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1811 { 1812 struct sk_buff *skb; 1813 1814 skb = tipc_sk_build_ack(tsk); 1815 if (!skb) 1816 return; 1817 1818 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1819 msg_link_selector(buf_msg(skb))); 1820 } 1821 1822 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1823 { 1824 struct sock *sk = sock->sk; 1825 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1826 long timeo = *timeop; 1827 int err = sock_error(sk); 1828 1829 if (err) 1830 return err; 1831 1832 for (;;) { 1833 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1834 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1835 err = -ENOTCONN; 1836 break; 1837 } 1838 add_wait_queue(sk_sleep(sk), &wait); 1839 release_sock(sk); 1840 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1841 sched_annotate_sleep(); 1842 lock_sock(sk); 1843 remove_wait_queue(sk_sleep(sk), &wait); 1844 } 1845 err = 0; 1846 if (!skb_queue_empty(&sk->sk_receive_queue)) 1847 break; 1848 err = -EAGAIN; 1849 if (!timeo) 1850 break; 1851 err = sock_intr_errno(timeo); 1852 if (signal_pending(current)) 1853 break; 1854 1855 err = sock_error(sk); 1856 if (err) 1857 break; 1858 } 1859 *timeop = timeo; 1860 return err; 1861 } 1862 1863 /** 1864 * tipc_recvmsg - receive packet-oriented message 1865 * @m: descriptor for message info 1866 * @buflen: length of user buffer area 1867 * @flags: receive flags 1868 * 1869 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1870 * If the complete message doesn't fit in user area, truncate it. 1871 * 1872 * Returns size of returned message data, errno otherwise 1873 */ 1874 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1875 size_t buflen, int flags) 1876 { 1877 struct sock *sk = sock->sk; 1878 bool connected = !tipc_sk_type_connectionless(sk); 1879 struct tipc_sock *tsk = tipc_sk(sk); 1880 int rc, err, hlen, dlen, copy; 1881 struct sk_buff_head xmitq; 1882 struct tipc_msg *hdr; 1883 struct sk_buff *skb; 1884 bool grp_evt; 1885 long timeout; 1886 1887 /* Catch invalid receive requests */ 1888 if (unlikely(!buflen)) 1889 return -EINVAL; 1890 1891 lock_sock(sk); 1892 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1893 rc = -ENOTCONN; 1894 goto exit; 1895 } 1896 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1897 1898 /* Step rcv queue to first msg with data or error; wait if necessary */ 1899 do { 1900 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1901 if (unlikely(rc)) 1902 goto exit; 1903 skb = skb_peek(&sk->sk_receive_queue); 1904 hdr = buf_msg(skb); 1905 dlen = msg_data_sz(hdr); 1906 hlen = msg_hdr_sz(hdr); 1907 err = msg_errcode(hdr); 1908 grp_evt = msg_is_grp_evt(hdr); 1909 if (likely(dlen || err)) 1910 break; 1911 tsk_advance_rx_queue(sk); 1912 } while (1); 1913 1914 /* Collect msg meta data, including error code and rejected data */ 1915 tipc_sk_set_orig_addr(m, skb); 1916 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1917 if (unlikely(rc)) 1918 goto exit; 1919 hdr = buf_msg(skb); 1920 1921 /* Capture data if non-error msg, otherwise just set return value */ 1922 if (likely(!err)) { 1923 copy = min_t(int, dlen, buflen); 1924 if (unlikely(copy != dlen)) 1925 m->msg_flags |= MSG_TRUNC; 1926 rc = skb_copy_datagram_msg(skb, hlen, m, copy); 1927 } else { 1928 copy = 0; 1929 rc = 0; 1930 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) 1931 rc = -ECONNRESET; 1932 } 1933 if (unlikely(rc)) 1934 goto exit; 1935 1936 /* Mark message as group event if applicable */ 1937 if (unlikely(grp_evt)) { 1938 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1939 m->msg_flags |= MSG_EOR; 1940 m->msg_flags |= MSG_OOB; 1941 copy = 0; 1942 } 1943 1944 /* Caption of data or error code/rejected data was successful */ 1945 if (unlikely(flags & MSG_PEEK)) 1946 goto exit; 1947 1948 /* Send group flow control advertisement when applicable */ 1949 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1950 __skb_queue_head_init(&xmitq); 1951 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1952 msg_orignode(hdr), msg_origport(hdr), 1953 &xmitq); 1954 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1955 } 1956 1957 tsk_advance_rx_queue(sk); 1958 1959 if (likely(!connected)) 1960 goto exit; 1961 1962 /* Send connection flow control advertisement when applicable */ 1963 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1964 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1965 tipc_sk_send_ack(tsk); 1966 exit: 1967 release_sock(sk); 1968 return rc ? rc : copy; 1969 } 1970 1971 /** 1972 * tipc_recvstream - receive stream-oriented data 1973 * @m: descriptor for message info 1974 * @buflen: total size of user buffer area 1975 * @flags: receive flags 1976 * 1977 * Used for SOCK_STREAM messages only. If not enough data is available 1978 * will optionally wait for more; never truncates data. 1979 * 1980 * Returns size of returned message data, errno otherwise 1981 */ 1982 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 1983 size_t buflen, int flags) 1984 { 1985 struct sock *sk = sock->sk; 1986 struct tipc_sock *tsk = tipc_sk(sk); 1987 struct sk_buff *skb; 1988 struct tipc_msg *hdr; 1989 struct tipc_skb_cb *skb_cb; 1990 bool peek = flags & MSG_PEEK; 1991 int offset, required, copy, copied = 0; 1992 int hlen, dlen, err, rc; 1993 long timeout; 1994 1995 /* Catch invalid receive attempts */ 1996 if (unlikely(!buflen)) 1997 return -EINVAL; 1998 1999 lock_sock(sk); 2000 2001 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2002 rc = -ENOTCONN; 2003 goto exit; 2004 } 2005 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2006 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2007 2008 do { 2009 /* Look at first msg in receive queue; wait if necessary */ 2010 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2011 if (unlikely(rc)) 2012 break; 2013 skb = skb_peek(&sk->sk_receive_queue); 2014 skb_cb = TIPC_SKB_CB(skb); 2015 hdr = buf_msg(skb); 2016 dlen = msg_data_sz(hdr); 2017 hlen = msg_hdr_sz(hdr); 2018 err = msg_errcode(hdr); 2019 2020 /* Discard any empty non-errored (SYN-) message */ 2021 if (unlikely(!dlen && !err)) { 2022 tsk_advance_rx_queue(sk); 2023 continue; 2024 } 2025 2026 /* Collect msg meta data, incl. error code and rejected data */ 2027 if (!copied) { 2028 tipc_sk_set_orig_addr(m, skb); 2029 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2030 if (rc) 2031 break; 2032 hdr = buf_msg(skb); 2033 } 2034 2035 /* Copy data if msg ok, otherwise return error/partial data */ 2036 if (likely(!err)) { 2037 offset = skb_cb->bytes_read; 2038 copy = min_t(int, dlen - offset, buflen - copied); 2039 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2040 if (unlikely(rc)) 2041 break; 2042 copied += copy; 2043 offset += copy; 2044 if (unlikely(offset < dlen)) { 2045 if (!peek) 2046 skb_cb->bytes_read = offset; 2047 break; 2048 } 2049 } else { 2050 rc = 0; 2051 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2052 rc = -ECONNRESET; 2053 if (copied || rc) 2054 break; 2055 } 2056 2057 if (unlikely(peek)) 2058 break; 2059 2060 tsk_advance_rx_queue(sk); 2061 2062 /* Send connection flow control advertisement when applicable */ 2063 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2064 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2065 tipc_sk_send_ack(tsk); 2066 2067 /* Exit if all requested data or FIN/error received */ 2068 if (copied == buflen || err) 2069 break; 2070 2071 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2072 exit: 2073 release_sock(sk); 2074 return copied ? copied : rc; 2075 } 2076 2077 /** 2078 * tipc_write_space - wake up thread if port congestion is released 2079 * @sk: socket 2080 */ 2081 static void tipc_write_space(struct sock *sk) 2082 { 2083 struct socket_wq *wq; 2084 2085 rcu_read_lock(); 2086 wq = rcu_dereference(sk->sk_wq); 2087 if (skwq_has_sleeper(wq)) 2088 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2089 EPOLLWRNORM | EPOLLWRBAND); 2090 rcu_read_unlock(); 2091 } 2092 2093 /** 2094 * tipc_data_ready - wake up threads to indicate messages have been received 2095 * @sk: socket 2096 */ 2097 static void tipc_data_ready(struct sock *sk) 2098 { 2099 struct socket_wq *wq; 2100 2101 rcu_read_lock(); 2102 wq = rcu_dereference(sk->sk_wq); 2103 if (skwq_has_sleeper(wq)) 2104 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2105 EPOLLRDNORM | EPOLLRDBAND); 2106 rcu_read_unlock(); 2107 } 2108 2109 static void tipc_sock_destruct(struct sock *sk) 2110 { 2111 __skb_queue_purge(&sk->sk_receive_queue); 2112 } 2113 2114 static void tipc_sk_proto_rcv(struct sock *sk, 2115 struct sk_buff_head *inputq, 2116 struct sk_buff_head *xmitq) 2117 { 2118 struct sk_buff *skb = __skb_dequeue(inputq); 2119 struct tipc_sock *tsk = tipc_sk(sk); 2120 struct tipc_msg *hdr = buf_msg(skb); 2121 struct tipc_group *grp = tsk->group; 2122 bool wakeup = false; 2123 2124 switch (msg_user(hdr)) { 2125 case CONN_MANAGER: 2126 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2127 return; 2128 case SOCK_WAKEUP: 2129 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2130 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2131 smp_wmb(); 2132 tsk->cong_link_cnt--; 2133 wakeup = true; 2134 tipc_sk_push_backlog(tsk, false); 2135 break; 2136 case GROUP_PROTOCOL: 2137 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2138 break; 2139 case TOP_SRV: 2140 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2141 hdr, inputq, xmitq); 2142 break; 2143 default: 2144 break; 2145 } 2146 2147 if (wakeup) 2148 sk->sk_write_space(sk); 2149 2150 kfree_skb(skb); 2151 } 2152 2153 /** 2154 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2155 * @tsk: TIPC socket 2156 * @skb: pointer to message buffer. 2157 * @xmitq: for Nagle ACK if any 2158 * Returns true if message should be added to receive queue, false otherwise 2159 */ 2160 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2161 struct sk_buff_head *xmitq) 2162 { 2163 struct sock *sk = &tsk->sk; 2164 struct net *net = sock_net(sk); 2165 struct tipc_msg *hdr = buf_msg(skb); 2166 bool con_msg = msg_connected(hdr); 2167 u32 pport = tsk_peer_port(tsk); 2168 u32 pnode = tsk_peer_node(tsk); 2169 u32 oport = msg_origport(hdr); 2170 u32 onode = msg_orignode(hdr); 2171 int err = msg_errcode(hdr); 2172 unsigned long delay; 2173 2174 if (unlikely(msg_mcast(hdr))) 2175 return false; 2176 tsk->oneway = 0; 2177 2178 switch (sk->sk_state) { 2179 case TIPC_CONNECTING: 2180 /* Setup ACK */ 2181 if (likely(con_msg)) { 2182 if (err) 2183 break; 2184 tipc_sk_finish_conn(tsk, oport, onode); 2185 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2186 /* ACK+ message with data is added to receive queue */ 2187 if (msg_data_sz(hdr)) 2188 return true; 2189 /* Empty ACK-, - wake up sleeping connect() and drop */ 2190 sk->sk_state_change(sk); 2191 msg_set_dest_droppable(hdr, 1); 2192 return false; 2193 } 2194 /* Ignore connectionless message if not from listening socket */ 2195 if (oport != pport || onode != pnode) 2196 return false; 2197 2198 /* Rejected SYN */ 2199 if (err != TIPC_ERR_OVERLOAD) 2200 break; 2201 2202 /* Prepare for new setup attempt if we have a SYN clone */ 2203 if (skb_queue_empty(&sk->sk_write_queue)) 2204 break; 2205 get_random_bytes(&delay, 2); 2206 delay %= (tsk->conn_timeout / 4); 2207 delay = msecs_to_jiffies(delay + 100); 2208 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2209 return false; 2210 case TIPC_OPEN: 2211 case TIPC_DISCONNECTING: 2212 return false; 2213 case TIPC_LISTEN: 2214 /* Accept only SYN message */ 2215 if (!msg_is_syn(hdr) && 2216 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2217 return false; 2218 if (!con_msg && !err) 2219 return true; 2220 return false; 2221 case TIPC_ESTABLISHED: 2222 if (!skb_queue_empty(&sk->sk_write_queue)) 2223 tipc_sk_push_backlog(tsk, false); 2224 /* Accept only connection-based messages sent by peer */ 2225 if (likely(con_msg && !err && pport == oport && 2226 pnode == onode)) { 2227 if (msg_ack_required(hdr)) { 2228 struct sk_buff *skb; 2229 2230 skb = tipc_sk_build_ack(tsk); 2231 if (skb) { 2232 msg_set_nagle_ack(buf_msg(skb)); 2233 __skb_queue_tail(xmitq, skb); 2234 } 2235 } 2236 return true; 2237 } 2238 if (!tsk_peer_msg(tsk, hdr)) 2239 return false; 2240 if (!err) 2241 return true; 2242 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2243 tipc_node_remove_conn(net, pnode, tsk->portid); 2244 sk->sk_state_change(sk); 2245 return true; 2246 default: 2247 pr_err("Unknown sk_state %u\n", sk->sk_state); 2248 } 2249 /* Abort connection setup attempt */ 2250 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2251 sk->sk_err = ECONNREFUSED; 2252 sk->sk_state_change(sk); 2253 return true; 2254 } 2255 2256 /** 2257 * rcvbuf_limit - get proper overload limit of socket receive queue 2258 * @sk: socket 2259 * @skb: message 2260 * 2261 * For connection oriented messages, irrespective of importance, 2262 * default queue limit is 2 MB. 2263 * 2264 * For connectionless messages, queue limits are based on message 2265 * importance as follows: 2266 * 2267 * TIPC_LOW_IMPORTANCE (2 MB) 2268 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2269 * TIPC_HIGH_IMPORTANCE (8 MB) 2270 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2271 * 2272 * Returns overload limit according to corresponding message importance 2273 */ 2274 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2275 { 2276 struct tipc_sock *tsk = tipc_sk(sk); 2277 struct tipc_msg *hdr = buf_msg(skb); 2278 2279 if (unlikely(msg_in_group(hdr))) 2280 return READ_ONCE(sk->sk_rcvbuf); 2281 2282 if (unlikely(!msg_connected(hdr))) 2283 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2284 2285 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2286 return READ_ONCE(sk->sk_rcvbuf); 2287 2288 return FLOWCTL_MSG_LIM; 2289 } 2290 2291 /** 2292 * tipc_sk_filter_rcv - validate incoming message 2293 * @sk: socket 2294 * @skb: pointer to message. 2295 * 2296 * Enqueues message on receive queue if acceptable; optionally handles 2297 * disconnect indication for a connected socket. 2298 * 2299 * Called with socket lock already taken 2300 * 2301 */ 2302 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2303 struct sk_buff_head *xmitq) 2304 { 2305 bool sk_conn = !tipc_sk_type_connectionless(sk); 2306 struct tipc_sock *tsk = tipc_sk(sk); 2307 struct tipc_group *grp = tsk->group; 2308 struct tipc_msg *hdr = buf_msg(skb); 2309 struct net *net = sock_net(sk); 2310 struct sk_buff_head inputq; 2311 int mtyp = msg_type(hdr); 2312 int limit, err = TIPC_OK; 2313 2314 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2315 TIPC_SKB_CB(skb)->bytes_read = 0; 2316 __skb_queue_head_init(&inputq); 2317 __skb_queue_tail(&inputq, skb); 2318 2319 if (unlikely(!msg_isdata(hdr))) 2320 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2321 2322 if (unlikely(grp)) 2323 tipc_group_filter_msg(grp, &inputq, xmitq); 2324 2325 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2326 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2327 2328 /* Validate and add to receive buffer if there is space */ 2329 while ((skb = __skb_dequeue(&inputq))) { 2330 hdr = buf_msg(skb); 2331 limit = rcvbuf_limit(sk, skb); 2332 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2333 (!sk_conn && msg_connected(hdr)) || 2334 (!grp && msg_in_group(hdr))) 2335 err = TIPC_ERR_NO_PORT; 2336 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2337 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2338 "err_overload2!"); 2339 atomic_inc(&sk->sk_drops); 2340 err = TIPC_ERR_OVERLOAD; 2341 } 2342 2343 if (unlikely(err)) { 2344 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2345 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2346 "@filter_rcv!"); 2347 __skb_queue_tail(xmitq, skb); 2348 } 2349 err = TIPC_OK; 2350 continue; 2351 } 2352 __skb_queue_tail(&sk->sk_receive_queue, skb); 2353 skb_set_owner_r(skb, sk); 2354 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2355 "rcvq >90% allocated!"); 2356 sk->sk_data_ready(sk); 2357 } 2358 } 2359 2360 /** 2361 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2362 * @sk: socket 2363 * @skb: message 2364 * 2365 * Caller must hold socket lock 2366 */ 2367 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2368 { 2369 unsigned int before = sk_rmem_alloc_get(sk); 2370 struct sk_buff_head xmitq; 2371 unsigned int added; 2372 2373 __skb_queue_head_init(&xmitq); 2374 2375 tipc_sk_filter_rcv(sk, skb, &xmitq); 2376 added = sk_rmem_alloc_get(sk) - before; 2377 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2378 2379 /* Send pending response/rejected messages, if any */ 2380 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2381 return 0; 2382 } 2383 2384 /** 2385 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2386 * inputq and try adding them to socket or backlog queue 2387 * @inputq: list of incoming buffers with potentially different destinations 2388 * @sk: socket where the buffers should be enqueued 2389 * @dport: port number for the socket 2390 * 2391 * Caller must hold socket lock 2392 */ 2393 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2394 u32 dport, struct sk_buff_head *xmitq) 2395 { 2396 unsigned long time_limit = jiffies + 2; 2397 struct sk_buff *skb; 2398 unsigned int lim; 2399 atomic_t *dcnt; 2400 u32 onode; 2401 2402 while (skb_queue_len(inputq)) { 2403 if (unlikely(time_after_eq(jiffies, time_limit))) 2404 return; 2405 2406 skb = tipc_skb_dequeue(inputq, dport); 2407 if (unlikely(!skb)) 2408 return; 2409 2410 /* Add message directly to receive queue if possible */ 2411 if (!sock_owned_by_user(sk)) { 2412 tipc_sk_filter_rcv(sk, skb, xmitq); 2413 continue; 2414 } 2415 2416 /* Try backlog, compensating for double-counted bytes */ 2417 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2418 if (!sk->sk_backlog.len) 2419 atomic_set(dcnt, 0); 2420 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2421 if (likely(!sk_add_backlog(sk, skb, lim))) { 2422 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2423 "bklg & rcvq >90% allocated!"); 2424 continue; 2425 } 2426 2427 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2428 /* Overload => reject message back to sender */ 2429 onode = tipc_own_addr(sock_net(sk)); 2430 atomic_inc(&sk->sk_drops); 2431 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2432 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2433 "@sk_enqueue!"); 2434 __skb_queue_tail(xmitq, skb); 2435 } 2436 break; 2437 } 2438 } 2439 2440 /** 2441 * tipc_sk_rcv - handle a chain of incoming buffers 2442 * @inputq: buffer list containing the buffers 2443 * Consumes all buffers in list until inputq is empty 2444 * Note: may be called in multiple threads referring to the same queue 2445 */ 2446 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2447 { 2448 struct sk_buff_head xmitq; 2449 u32 dnode, dport = 0; 2450 int err; 2451 struct tipc_sock *tsk; 2452 struct sock *sk; 2453 struct sk_buff *skb; 2454 2455 __skb_queue_head_init(&xmitq); 2456 while (skb_queue_len(inputq)) { 2457 dport = tipc_skb_peek_port(inputq, dport); 2458 tsk = tipc_sk_lookup(net, dport); 2459 2460 if (likely(tsk)) { 2461 sk = &tsk->sk; 2462 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2463 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2464 spin_unlock_bh(&sk->sk_lock.slock); 2465 } 2466 /* Send pending response/rejected messages, if any */ 2467 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2468 sock_put(sk); 2469 continue; 2470 } 2471 /* No destination socket => dequeue skb if still there */ 2472 skb = tipc_skb_dequeue(inputq, dport); 2473 if (!skb) 2474 return; 2475 2476 /* Try secondary lookup if unresolved named message */ 2477 err = TIPC_ERR_NO_PORT; 2478 if (tipc_msg_lookup_dest(net, skb, &err)) 2479 goto xmit; 2480 2481 /* Prepare for message rejection */ 2482 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2483 continue; 2484 2485 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2486 xmit: 2487 dnode = msg_destnode(buf_msg(skb)); 2488 tipc_node_xmit_skb(net, skb, dnode, dport); 2489 } 2490 } 2491 2492 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2493 { 2494 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2495 struct sock *sk = sock->sk; 2496 int done; 2497 2498 do { 2499 int err = sock_error(sk); 2500 if (err) 2501 return err; 2502 if (!*timeo_p) 2503 return -ETIMEDOUT; 2504 if (signal_pending(current)) 2505 return sock_intr_errno(*timeo_p); 2506 if (sk->sk_state == TIPC_DISCONNECTING) 2507 break; 2508 2509 add_wait_queue(sk_sleep(sk), &wait); 2510 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2511 &wait); 2512 remove_wait_queue(sk_sleep(sk), &wait); 2513 } while (!done); 2514 return 0; 2515 } 2516 2517 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2518 { 2519 if (addr->family != AF_TIPC) 2520 return false; 2521 if (addr->addrtype == TIPC_SERVICE_RANGE) 2522 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2523 return (addr->addrtype == TIPC_SERVICE_ADDR || 2524 addr->addrtype == TIPC_SOCKET_ADDR); 2525 } 2526 2527 /** 2528 * tipc_connect - establish a connection to another TIPC port 2529 * @sock: socket structure 2530 * @dest: socket address for destination port 2531 * @destlen: size of socket address data structure 2532 * @flags: file-related flags associated with socket 2533 * 2534 * Returns 0 on success, errno otherwise 2535 */ 2536 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2537 int destlen, int flags) 2538 { 2539 struct sock *sk = sock->sk; 2540 struct tipc_sock *tsk = tipc_sk(sk); 2541 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2542 struct msghdr m = {NULL,}; 2543 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2544 int previous; 2545 int res = 0; 2546 2547 if (destlen != sizeof(struct sockaddr_tipc)) 2548 return -EINVAL; 2549 2550 lock_sock(sk); 2551 2552 if (tsk->group) { 2553 res = -EINVAL; 2554 goto exit; 2555 } 2556 2557 if (dst->family == AF_UNSPEC) { 2558 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2559 if (!tipc_sk_type_connectionless(sk)) 2560 res = -EINVAL; 2561 goto exit; 2562 } 2563 if (!tipc_sockaddr_is_sane(dst)) { 2564 res = -EINVAL; 2565 goto exit; 2566 } 2567 /* DGRAM/RDM connect(), just save the destaddr */ 2568 if (tipc_sk_type_connectionless(sk)) { 2569 memcpy(&tsk->peer, dest, destlen); 2570 goto exit; 2571 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2572 res = -EINVAL; 2573 goto exit; 2574 } 2575 2576 previous = sk->sk_state; 2577 2578 switch (sk->sk_state) { 2579 case TIPC_OPEN: 2580 /* Send a 'SYN-' to destination */ 2581 m.msg_name = dest; 2582 m.msg_namelen = destlen; 2583 2584 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2585 * indicate send_msg() is never blocked. 2586 */ 2587 if (!timeout) 2588 m.msg_flags = MSG_DONTWAIT; 2589 2590 res = __tipc_sendmsg(sock, &m, 0); 2591 if ((res < 0) && (res != -EWOULDBLOCK)) 2592 goto exit; 2593 2594 /* Just entered TIPC_CONNECTING state; the only 2595 * difference is that return value in non-blocking 2596 * case is EINPROGRESS, rather than EALREADY. 2597 */ 2598 res = -EINPROGRESS; 2599 fallthrough; 2600 case TIPC_CONNECTING: 2601 if (!timeout) { 2602 if (previous == TIPC_CONNECTING) 2603 res = -EALREADY; 2604 goto exit; 2605 } 2606 timeout = msecs_to_jiffies(timeout); 2607 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2608 res = tipc_wait_for_connect(sock, &timeout); 2609 break; 2610 case TIPC_ESTABLISHED: 2611 res = -EISCONN; 2612 break; 2613 default: 2614 res = -EINVAL; 2615 } 2616 2617 exit: 2618 release_sock(sk); 2619 return res; 2620 } 2621 2622 /** 2623 * tipc_listen - allow socket to listen for incoming connections 2624 * @sock: socket structure 2625 * @len: (unused) 2626 * 2627 * Returns 0 on success, errno otherwise 2628 */ 2629 static int tipc_listen(struct socket *sock, int len) 2630 { 2631 struct sock *sk = sock->sk; 2632 int res; 2633 2634 lock_sock(sk); 2635 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2636 release_sock(sk); 2637 2638 return res; 2639 } 2640 2641 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2642 { 2643 struct sock *sk = sock->sk; 2644 DEFINE_WAIT(wait); 2645 int err; 2646 2647 /* True wake-one mechanism for incoming connections: only 2648 * one process gets woken up, not the 'whole herd'. 2649 * Since we do not 'race & poll' for established sockets 2650 * anymore, the common case will execute the loop only once. 2651 */ 2652 for (;;) { 2653 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 2654 TASK_INTERRUPTIBLE); 2655 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2656 release_sock(sk); 2657 timeo = schedule_timeout(timeo); 2658 lock_sock(sk); 2659 } 2660 err = 0; 2661 if (!skb_queue_empty(&sk->sk_receive_queue)) 2662 break; 2663 err = -EAGAIN; 2664 if (!timeo) 2665 break; 2666 err = sock_intr_errno(timeo); 2667 if (signal_pending(current)) 2668 break; 2669 } 2670 finish_wait(sk_sleep(sk), &wait); 2671 return err; 2672 } 2673 2674 /** 2675 * tipc_accept - wait for connection request 2676 * @sock: listening socket 2677 * @new_sock: new socket that is to be connected 2678 * @flags: file-related flags associated with socket 2679 * 2680 * Returns 0 on success, errno otherwise 2681 */ 2682 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2683 bool kern) 2684 { 2685 struct sock *new_sk, *sk = sock->sk; 2686 struct sk_buff *buf; 2687 struct tipc_sock *new_tsock; 2688 struct tipc_msg *msg; 2689 long timeo; 2690 int res; 2691 2692 lock_sock(sk); 2693 2694 if (sk->sk_state != TIPC_LISTEN) { 2695 res = -EINVAL; 2696 goto exit; 2697 } 2698 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2699 res = tipc_wait_for_accept(sock, timeo); 2700 if (res) 2701 goto exit; 2702 2703 buf = skb_peek(&sk->sk_receive_queue); 2704 2705 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2706 if (res) 2707 goto exit; 2708 security_sk_clone(sock->sk, new_sock->sk); 2709 2710 new_sk = new_sock->sk; 2711 new_tsock = tipc_sk(new_sk); 2712 msg = buf_msg(buf); 2713 2714 /* we lock on new_sk; but lockdep sees the lock on sk */ 2715 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2716 2717 /* 2718 * Reject any stray messages received by new socket 2719 * before the socket lock was taken (very, very unlikely) 2720 */ 2721 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2722 2723 /* Connect new socket to it's peer */ 2724 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2725 2726 tsk_set_importance(new_sk, msg_importance(msg)); 2727 if (msg_named(msg)) { 2728 new_tsock->conn_type = msg_nametype(msg); 2729 new_tsock->conn_instance = msg_nameinst(msg); 2730 } 2731 2732 /* 2733 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 2734 * Respond to 'SYN+' by queuing it on new socket. 2735 */ 2736 if (!msg_data_sz(msg)) { 2737 struct msghdr m = {NULL,}; 2738 2739 tsk_advance_rx_queue(sk); 2740 __tipc_sendstream(new_sock, &m, 0); 2741 } else { 2742 __skb_dequeue(&sk->sk_receive_queue); 2743 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2744 skb_set_owner_r(buf, new_sk); 2745 } 2746 release_sock(new_sk); 2747 exit: 2748 release_sock(sk); 2749 return res; 2750 } 2751 2752 /** 2753 * tipc_shutdown - shutdown socket connection 2754 * @sock: socket structure 2755 * @how: direction to close (must be SHUT_RDWR) 2756 * 2757 * Terminates connection (if necessary), then purges socket's receive queue. 2758 * 2759 * Returns 0 on success, errno otherwise 2760 */ 2761 static int tipc_shutdown(struct socket *sock, int how) 2762 { 2763 struct sock *sk = sock->sk; 2764 int res; 2765 2766 if (how != SHUT_RDWR) 2767 return -EINVAL; 2768 2769 lock_sock(sk); 2770 2771 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2772 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2773 sk->sk_shutdown = SHUTDOWN_MASK; 2774 2775 if (sk->sk_state == TIPC_DISCONNECTING) { 2776 /* Discard any unreceived messages */ 2777 __skb_queue_purge(&sk->sk_receive_queue); 2778 2779 res = 0; 2780 } else { 2781 res = -ENOTCONN; 2782 } 2783 /* Wake up anyone sleeping in poll. */ 2784 sk->sk_state_change(sk); 2785 2786 release_sock(sk); 2787 return res; 2788 } 2789 2790 static void tipc_sk_check_probing_state(struct sock *sk, 2791 struct sk_buff_head *list) 2792 { 2793 struct tipc_sock *tsk = tipc_sk(sk); 2794 u32 pnode = tsk_peer_node(tsk); 2795 u32 pport = tsk_peer_port(tsk); 2796 u32 self = tsk_own_node(tsk); 2797 u32 oport = tsk->portid; 2798 struct sk_buff *skb; 2799 2800 if (tsk->probe_unacked) { 2801 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2802 sk->sk_err = ECONNABORTED; 2803 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2804 sk->sk_state_change(sk); 2805 return; 2806 } 2807 /* Prepare new probe */ 2808 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2809 pnode, self, pport, oport, TIPC_OK); 2810 if (skb) 2811 __skb_queue_tail(list, skb); 2812 tsk->probe_unacked = true; 2813 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2814 } 2815 2816 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2817 { 2818 struct tipc_sock *tsk = tipc_sk(sk); 2819 2820 /* Try again later if dest link is congested */ 2821 if (tsk->cong_link_cnt) { 2822 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2823 return; 2824 } 2825 /* Prepare SYN for retransmit */ 2826 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2827 } 2828 2829 static void tipc_sk_timeout(struct timer_list *t) 2830 { 2831 struct sock *sk = from_timer(sk, t, sk_timer); 2832 struct tipc_sock *tsk = tipc_sk(sk); 2833 u32 pnode = tsk_peer_node(tsk); 2834 struct sk_buff_head list; 2835 int rc = 0; 2836 2837 __skb_queue_head_init(&list); 2838 bh_lock_sock(sk); 2839 2840 /* Try again later if socket is busy */ 2841 if (sock_owned_by_user(sk)) { 2842 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2843 bh_unlock_sock(sk); 2844 sock_put(sk); 2845 return; 2846 } 2847 2848 if (sk->sk_state == TIPC_ESTABLISHED) 2849 tipc_sk_check_probing_state(sk, &list); 2850 else if (sk->sk_state == TIPC_CONNECTING) 2851 tipc_sk_retry_connect(sk, &list); 2852 2853 bh_unlock_sock(sk); 2854 2855 if (!skb_queue_empty(&list)) 2856 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2857 2858 /* SYN messages may cause link congestion */ 2859 if (rc == -ELINKCONG) { 2860 tipc_dest_push(&tsk->cong_links, pnode, 0); 2861 tsk->cong_link_cnt = 1; 2862 } 2863 sock_put(sk); 2864 } 2865 2866 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 2867 struct tipc_name_seq const *seq) 2868 { 2869 struct sock *sk = &tsk->sk; 2870 struct net *net = sock_net(sk); 2871 struct publication *publ; 2872 u32 key; 2873 2874 if (scope != TIPC_NODE_SCOPE) 2875 scope = TIPC_CLUSTER_SCOPE; 2876 2877 if (tipc_sk_connected(sk)) 2878 return -EINVAL; 2879 key = tsk->portid + tsk->pub_count + 1; 2880 if (key == tsk->portid) 2881 return -EADDRINUSE; 2882 2883 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper, 2884 scope, tsk->portid, key); 2885 if (unlikely(!publ)) 2886 return -EINVAL; 2887 2888 list_add(&publ->binding_sock, &tsk->publications); 2889 tsk->pub_count++; 2890 tsk->published = 1; 2891 return 0; 2892 } 2893 2894 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 2895 struct tipc_name_seq const *seq) 2896 { 2897 struct net *net = sock_net(&tsk->sk); 2898 struct publication *publ; 2899 struct publication *safe; 2900 int rc = -EINVAL; 2901 2902 if (scope != TIPC_NODE_SCOPE) 2903 scope = TIPC_CLUSTER_SCOPE; 2904 2905 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) { 2906 if (seq) { 2907 if (publ->scope != scope) 2908 continue; 2909 if (publ->type != seq->type) 2910 continue; 2911 if (publ->lower != seq->lower) 2912 continue; 2913 if (publ->upper != seq->upper) 2914 break; 2915 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2916 publ->upper, publ->key); 2917 rc = 0; 2918 break; 2919 } 2920 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2921 publ->upper, publ->key); 2922 rc = 0; 2923 } 2924 if (list_empty(&tsk->publications)) 2925 tsk->published = 0; 2926 return rc; 2927 } 2928 2929 /* tipc_sk_reinit: set non-zero address in all existing sockets 2930 * when we go from standalone to network mode. 2931 */ 2932 void tipc_sk_reinit(struct net *net) 2933 { 2934 struct tipc_net *tn = net_generic(net, tipc_net_id); 2935 struct rhashtable_iter iter; 2936 struct tipc_sock *tsk; 2937 struct tipc_msg *msg; 2938 2939 rhashtable_walk_enter(&tn->sk_rht, &iter); 2940 2941 do { 2942 rhashtable_walk_start(&iter); 2943 2944 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2945 sock_hold(&tsk->sk); 2946 rhashtable_walk_stop(&iter); 2947 lock_sock(&tsk->sk); 2948 msg = &tsk->phdr; 2949 msg_set_prevnode(msg, tipc_own_addr(net)); 2950 msg_set_orignode(msg, tipc_own_addr(net)); 2951 release_sock(&tsk->sk); 2952 rhashtable_walk_start(&iter); 2953 sock_put(&tsk->sk); 2954 } 2955 2956 rhashtable_walk_stop(&iter); 2957 } while (tsk == ERR_PTR(-EAGAIN)); 2958 2959 rhashtable_walk_exit(&iter); 2960 } 2961 2962 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2963 { 2964 struct tipc_net *tn = net_generic(net, tipc_net_id); 2965 struct tipc_sock *tsk; 2966 2967 rcu_read_lock(); 2968 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2969 if (tsk) 2970 sock_hold(&tsk->sk); 2971 rcu_read_unlock(); 2972 2973 return tsk; 2974 } 2975 2976 static int tipc_sk_insert(struct tipc_sock *tsk) 2977 { 2978 struct sock *sk = &tsk->sk; 2979 struct net *net = sock_net(sk); 2980 struct tipc_net *tn = net_generic(net, tipc_net_id); 2981 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 2982 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 2983 2984 while (remaining--) { 2985 portid++; 2986 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 2987 portid = TIPC_MIN_PORT; 2988 tsk->portid = portid; 2989 sock_hold(&tsk->sk); 2990 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 2991 tsk_rht_params)) 2992 return 0; 2993 sock_put(&tsk->sk); 2994 } 2995 2996 return -1; 2997 } 2998 2999 static void tipc_sk_remove(struct tipc_sock *tsk) 3000 { 3001 struct sock *sk = &tsk->sk; 3002 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3003 3004 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3005 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3006 __sock_put(sk); 3007 } 3008 } 3009 3010 static const struct rhashtable_params tsk_rht_params = { 3011 .nelem_hint = 192, 3012 .head_offset = offsetof(struct tipc_sock, node), 3013 .key_offset = offsetof(struct tipc_sock, portid), 3014 .key_len = sizeof(u32), /* portid */ 3015 .max_size = 1048576, 3016 .min_size = 256, 3017 .automatic_shrinking = true, 3018 }; 3019 3020 int tipc_sk_rht_init(struct net *net) 3021 { 3022 struct tipc_net *tn = net_generic(net, tipc_net_id); 3023 3024 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3025 } 3026 3027 void tipc_sk_rht_destroy(struct net *net) 3028 { 3029 struct tipc_net *tn = net_generic(net, tipc_net_id); 3030 3031 /* Wait for socket readers to complete */ 3032 synchronize_net(); 3033 3034 rhashtable_destroy(&tn->sk_rht); 3035 } 3036 3037 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3038 { 3039 struct net *net = sock_net(&tsk->sk); 3040 struct tipc_group *grp = tsk->group; 3041 struct tipc_msg *hdr = &tsk->phdr; 3042 struct tipc_name_seq seq; 3043 int rc; 3044 3045 if (mreq->type < TIPC_RESERVED_TYPES) 3046 return -EACCES; 3047 if (mreq->scope > TIPC_NODE_SCOPE) 3048 return -EINVAL; 3049 if (grp) 3050 return -EACCES; 3051 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3052 if (!grp) 3053 return -ENOMEM; 3054 tsk->group = grp; 3055 msg_set_lookup_scope(hdr, mreq->scope); 3056 msg_set_nametype(hdr, mreq->type); 3057 msg_set_dest_droppable(hdr, true); 3058 seq.type = mreq->type; 3059 seq.lower = mreq->instance; 3060 seq.upper = seq.lower; 3061 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope); 3062 rc = tipc_sk_publish(tsk, mreq->scope, &seq); 3063 if (rc) { 3064 tipc_group_delete(net, grp); 3065 tsk->group = NULL; 3066 return rc; 3067 } 3068 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3069 tsk->mc_method.rcast = true; 3070 tsk->mc_method.mandatory = true; 3071 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3072 return rc; 3073 } 3074 3075 static int tipc_sk_leave(struct tipc_sock *tsk) 3076 { 3077 struct net *net = sock_net(&tsk->sk); 3078 struct tipc_group *grp = tsk->group; 3079 struct tipc_name_seq seq; 3080 int scope; 3081 3082 if (!grp) 3083 return -EINVAL; 3084 tipc_group_self(grp, &seq, &scope); 3085 tipc_group_delete(net, grp); 3086 tsk->group = NULL; 3087 tipc_sk_withdraw(tsk, scope, &seq); 3088 return 0; 3089 } 3090 3091 /** 3092 * tipc_setsockopt - set socket option 3093 * @sock: socket structure 3094 * @lvl: option level 3095 * @opt: option identifier 3096 * @ov: pointer to new option value 3097 * @ol: length of option value 3098 * 3099 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3100 * (to ease compatibility). 3101 * 3102 * Returns 0 on success, errno otherwise 3103 */ 3104 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3105 sockptr_t ov, unsigned int ol) 3106 { 3107 struct sock *sk = sock->sk; 3108 struct tipc_sock *tsk = tipc_sk(sk); 3109 struct tipc_group_req mreq; 3110 u32 value = 0; 3111 int res = 0; 3112 3113 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3114 return 0; 3115 if (lvl != SOL_TIPC) 3116 return -ENOPROTOOPT; 3117 3118 switch (opt) { 3119 case TIPC_IMPORTANCE: 3120 case TIPC_SRC_DROPPABLE: 3121 case TIPC_DEST_DROPPABLE: 3122 case TIPC_CONN_TIMEOUT: 3123 case TIPC_NODELAY: 3124 if (ol < sizeof(value)) 3125 return -EINVAL; 3126 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3127 return -EFAULT; 3128 break; 3129 case TIPC_GROUP_JOIN: 3130 if (ol < sizeof(mreq)) 3131 return -EINVAL; 3132 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3133 return -EFAULT; 3134 break; 3135 default: 3136 if (!sockptr_is_null(ov) || ol) 3137 return -EINVAL; 3138 } 3139 3140 lock_sock(sk); 3141 3142 switch (opt) { 3143 case TIPC_IMPORTANCE: 3144 res = tsk_set_importance(sk, value); 3145 break; 3146 case TIPC_SRC_DROPPABLE: 3147 if (sock->type != SOCK_STREAM) 3148 tsk_set_unreliable(tsk, value); 3149 else 3150 res = -ENOPROTOOPT; 3151 break; 3152 case TIPC_DEST_DROPPABLE: 3153 tsk_set_unreturnable(tsk, value); 3154 break; 3155 case TIPC_CONN_TIMEOUT: 3156 tipc_sk(sk)->conn_timeout = value; 3157 break; 3158 case TIPC_MCAST_BROADCAST: 3159 tsk->mc_method.rcast = false; 3160 tsk->mc_method.mandatory = true; 3161 break; 3162 case TIPC_MCAST_REPLICAST: 3163 tsk->mc_method.rcast = true; 3164 tsk->mc_method.mandatory = true; 3165 break; 3166 case TIPC_GROUP_JOIN: 3167 res = tipc_sk_join(tsk, &mreq); 3168 break; 3169 case TIPC_GROUP_LEAVE: 3170 res = tipc_sk_leave(tsk); 3171 break; 3172 case TIPC_NODELAY: 3173 tsk->nodelay = !!value; 3174 tsk_set_nagle(tsk); 3175 break; 3176 default: 3177 res = -EINVAL; 3178 } 3179 3180 release_sock(sk); 3181 3182 return res; 3183 } 3184 3185 /** 3186 * tipc_getsockopt - get socket option 3187 * @sock: socket structure 3188 * @lvl: option level 3189 * @opt: option identifier 3190 * @ov: receptacle for option value 3191 * @ol: receptacle for length of option value 3192 * 3193 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3194 * (to ease compatibility). 3195 * 3196 * Returns 0 on success, errno otherwise 3197 */ 3198 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3199 char __user *ov, int __user *ol) 3200 { 3201 struct sock *sk = sock->sk; 3202 struct tipc_sock *tsk = tipc_sk(sk); 3203 struct tipc_name_seq seq; 3204 int len, scope; 3205 u32 value; 3206 int res; 3207 3208 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3209 return put_user(0, ol); 3210 if (lvl != SOL_TIPC) 3211 return -ENOPROTOOPT; 3212 res = get_user(len, ol); 3213 if (res) 3214 return res; 3215 3216 lock_sock(sk); 3217 3218 switch (opt) { 3219 case TIPC_IMPORTANCE: 3220 value = tsk_importance(tsk); 3221 break; 3222 case TIPC_SRC_DROPPABLE: 3223 value = tsk_unreliable(tsk); 3224 break; 3225 case TIPC_DEST_DROPPABLE: 3226 value = tsk_unreturnable(tsk); 3227 break; 3228 case TIPC_CONN_TIMEOUT: 3229 value = tsk->conn_timeout; 3230 /* no need to set "res", since already 0 at this point */ 3231 break; 3232 case TIPC_NODE_RECVQ_DEPTH: 3233 value = 0; /* was tipc_queue_size, now obsolete */ 3234 break; 3235 case TIPC_SOCK_RECVQ_DEPTH: 3236 value = skb_queue_len(&sk->sk_receive_queue); 3237 break; 3238 case TIPC_SOCK_RECVQ_USED: 3239 value = sk_rmem_alloc_get(sk); 3240 break; 3241 case TIPC_GROUP_JOIN: 3242 seq.type = 0; 3243 if (tsk->group) 3244 tipc_group_self(tsk->group, &seq, &scope); 3245 value = seq.type; 3246 break; 3247 default: 3248 res = -EINVAL; 3249 } 3250 3251 release_sock(sk); 3252 3253 if (res) 3254 return res; /* "get" failed */ 3255 3256 if (len < sizeof(value)) 3257 return -EINVAL; 3258 3259 if (copy_to_user(ov, &value, sizeof(value))) 3260 return -EFAULT; 3261 3262 return put_user(sizeof(value), ol); 3263 } 3264 3265 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3266 { 3267 struct net *net = sock_net(sock->sk); 3268 struct tipc_sioc_nodeid_req nr = {0}; 3269 struct tipc_sioc_ln_req lnr; 3270 void __user *argp = (void __user *)arg; 3271 3272 switch (cmd) { 3273 case SIOCGETLINKNAME: 3274 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3275 return -EFAULT; 3276 if (!tipc_node_get_linkname(net, 3277 lnr.bearer_id & 0xffff, lnr.peer, 3278 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3279 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3280 return -EFAULT; 3281 return 0; 3282 } 3283 return -EADDRNOTAVAIL; 3284 case SIOCGETNODEID: 3285 if (copy_from_user(&nr, argp, sizeof(nr))) 3286 return -EFAULT; 3287 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3288 return -EADDRNOTAVAIL; 3289 if (copy_to_user(argp, &nr, sizeof(nr))) 3290 return -EFAULT; 3291 return 0; 3292 default: 3293 return -ENOIOCTLCMD; 3294 } 3295 } 3296 3297 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3298 { 3299 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3300 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3301 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3302 3303 tsk1->peer.family = AF_TIPC; 3304 tsk1->peer.addrtype = TIPC_ADDR_ID; 3305 tsk1->peer.scope = TIPC_NODE_SCOPE; 3306 tsk1->peer.addr.id.ref = tsk2->portid; 3307 tsk1->peer.addr.id.node = onode; 3308 tsk2->peer.family = AF_TIPC; 3309 tsk2->peer.addrtype = TIPC_ADDR_ID; 3310 tsk2->peer.scope = TIPC_NODE_SCOPE; 3311 tsk2->peer.addr.id.ref = tsk1->portid; 3312 tsk2->peer.addr.id.node = onode; 3313 3314 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3315 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3316 return 0; 3317 } 3318 3319 /* Protocol switches for the various types of TIPC sockets */ 3320 3321 static const struct proto_ops msg_ops = { 3322 .owner = THIS_MODULE, 3323 .family = AF_TIPC, 3324 .release = tipc_release, 3325 .bind = tipc_bind, 3326 .connect = tipc_connect, 3327 .socketpair = tipc_socketpair, 3328 .accept = sock_no_accept, 3329 .getname = tipc_getname, 3330 .poll = tipc_poll, 3331 .ioctl = tipc_ioctl, 3332 .listen = sock_no_listen, 3333 .shutdown = tipc_shutdown, 3334 .setsockopt = tipc_setsockopt, 3335 .getsockopt = tipc_getsockopt, 3336 .sendmsg = tipc_sendmsg, 3337 .recvmsg = tipc_recvmsg, 3338 .mmap = sock_no_mmap, 3339 .sendpage = sock_no_sendpage 3340 }; 3341 3342 static const struct proto_ops packet_ops = { 3343 .owner = THIS_MODULE, 3344 .family = AF_TIPC, 3345 .release = tipc_release, 3346 .bind = tipc_bind, 3347 .connect = tipc_connect, 3348 .socketpair = tipc_socketpair, 3349 .accept = tipc_accept, 3350 .getname = tipc_getname, 3351 .poll = tipc_poll, 3352 .ioctl = tipc_ioctl, 3353 .listen = tipc_listen, 3354 .shutdown = tipc_shutdown, 3355 .setsockopt = tipc_setsockopt, 3356 .getsockopt = tipc_getsockopt, 3357 .sendmsg = tipc_send_packet, 3358 .recvmsg = tipc_recvmsg, 3359 .mmap = sock_no_mmap, 3360 .sendpage = sock_no_sendpage 3361 }; 3362 3363 static const struct proto_ops stream_ops = { 3364 .owner = THIS_MODULE, 3365 .family = AF_TIPC, 3366 .release = tipc_release, 3367 .bind = tipc_bind, 3368 .connect = tipc_connect, 3369 .socketpair = tipc_socketpair, 3370 .accept = tipc_accept, 3371 .getname = tipc_getname, 3372 .poll = tipc_poll, 3373 .ioctl = tipc_ioctl, 3374 .listen = tipc_listen, 3375 .shutdown = tipc_shutdown, 3376 .setsockopt = tipc_setsockopt, 3377 .getsockopt = tipc_getsockopt, 3378 .sendmsg = tipc_sendstream, 3379 .recvmsg = tipc_recvstream, 3380 .mmap = sock_no_mmap, 3381 .sendpage = sock_no_sendpage 3382 }; 3383 3384 static const struct net_proto_family tipc_family_ops = { 3385 .owner = THIS_MODULE, 3386 .family = AF_TIPC, 3387 .create = tipc_sk_create 3388 }; 3389 3390 static struct proto tipc_proto = { 3391 .name = "TIPC", 3392 .owner = THIS_MODULE, 3393 .obj_size = sizeof(struct tipc_sock), 3394 .sysctl_rmem = sysctl_tipc_rmem 3395 }; 3396 3397 /** 3398 * tipc_socket_init - initialize TIPC socket interface 3399 * 3400 * Returns 0 on success, errno otherwise 3401 */ 3402 int tipc_socket_init(void) 3403 { 3404 int res; 3405 3406 res = proto_register(&tipc_proto, 1); 3407 if (res) { 3408 pr_err("Failed to register TIPC protocol type\n"); 3409 goto out; 3410 } 3411 3412 res = sock_register(&tipc_family_ops); 3413 if (res) { 3414 pr_err("Failed to register TIPC socket type\n"); 3415 proto_unregister(&tipc_proto); 3416 goto out; 3417 } 3418 out: 3419 return res; 3420 } 3421 3422 /** 3423 * tipc_socket_stop - stop TIPC socket interface 3424 */ 3425 void tipc_socket_stop(void) 3426 { 3427 sock_unregister(tipc_family_ops.family); 3428 proto_unregister(&tipc_proto); 3429 } 3430 3431 /* Caller should hold socket lock for the passed tipc socket. */ 3432 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3433 { 3434 u32 peer_node; 3435 u32 peer_port; 3436 struct nlattr *nest; 3437 3438 peer_node = tsk_peer_node(tsk); 3439 peer_port = tsk_peer_port(tsk); 3440 3441 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3442 if (!nest) 3443 return -EMSGSIZE; 3444 3445 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3446 goto msg_full; 3447 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3448 goto msg_full; 3449 3450 if (tsk->conn_type != 0) { 3451 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3452 goto msg_full; 3453 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) 3454 goto msg_full; 3455 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) 3456 goto msg_full; 3457 } 3458 nla_nest_end(skb, nest); 3459 3460 return 0; 3461 3462 msg_full: 3463 nla_nest_cancel(skb, nest); 3464 3465 return -EMSGSIZE; 3466 } 3467 3468 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3469 *tsk) 3470 { 3471 struct net *net = sock_net(skb->sk); 3472 struct sock *sk = &tsk->sk; 3473 3474 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3475 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3476 return -EMSGSIZE; 3477 3478 if (tipc_sk_connected(sk)) { 3479 if (__tipc_nl_add_sk_con(skb, tsk)) 3480 return -EMSGSIZE; 3481 } else if (!list_empty(&tsk->publications)) { 3482 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3483 return -EMSGSIZE; 3484 } 3485 return 0; 3486 } 3487 3488 /* Caller should hold socket lock for the passed tipc socket. */ 3489 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3490 struct tipc_sock *tsk) 3491 { 3492 struct nlattr *attrs; 3493 void *hdr; 3494 3495 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3496 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3497 if (!hdr) 3498 goto msg_cancel; 3499 3500 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3501 if (!attrs) 3502 goto genlmsg_cancel; 3503 3504 if (__tipc_nl_add_sk_info(skb, tsk)) 3505 goto attr_msg_cancel; 3506 3507 nla_nest_end(skb, attrs); 3508 genlmsg_end(skb, hdr); 3509 3510 return 0; 3511 3512 attr_msg_cancel: 3513 nla_nest_cancel(skb, attrs); 3514 genlmsg_cancel: 3515 genlmsg_cancel(skb, hdr); 3516 msg_cancel: 3517 return -EMSGSIZE; 3518 } 3519 3520 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3521 int (*skb_handler)(struct sk_buff *skb, 3522 struct netlink_callback *cb, 3523 struct tipc_sock *tsk)) 3524 { 3525 struct rhashtable_iter *iter = (void *)cb->args[4]; 3526 struct tipc_sock *tsk; 3527 int err; 3528 3529 rhashtable_walk_start(iter); 3530 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3531 if (IS_ERR(tsk)) { 3532 err = PTR_ERR(tsk); 3533 if (err == -EAGAIN) { 3534 err = 0; 3535 continue; 3536 } 3537 break; 3538 } 3539 3540 sock_hold(&tsk->sk); 3541 rhashtable_walk_stop(iter); 3542 lock_sock(&tsk->sk); 3543 err = skb_handler(skb, cb, tsk); 3544 if (err) { 3545 release_sock(&tsk->sk); 3546 sock_put(&tsk->sk); 3547 goto out; 3548 } 3549 release_sock(&tsk->sk); 3550 rhashtable_walk_start(iter); 3551 sock_put(&tsk->sk); 3552 } 3553 rhashtable_walk_stop(iter); 3554 out: 3555 return skb->len; 3556 } 3557 EXPORT_SYMBOL(tipc_nl_sk_walk); 3558 3559 int tipc_dump_start(struct netlink_callback *cb) 3560 { 3561 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3562 } 3563 EXPORT_SYMBOL(tipc_dump_start); 3564 3565 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3566 { 3567 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3568 struct rhashtable_iter *iter = (void *)cb->args[4]; 3569 struct tipc_net *tn = tipc_net(net); 3570 3571 if (!iter) { 3572 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3573 if (!iter) 3574 return -ENOMEM; 3575 3576 cb->args[4] = (long)iter; 3577 } 3578 3579 rhashtable_walk_enter(&tn->sk_rht, iter); 3580 return 0; 3581 } 3582 3583 int tipc_dump_done(struct netlink_callback *cb) 3584 { 3585 struct rhashtable_iter *hti = (void *)cb->args[4]; 3586 3587 rhashtable_walk_exit(hti); 3588 kfree(hti); 3589 return 0; 3590 } 3591 EXPORT_SYMBOL(tipc_dump_done); 3592 3593 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3594 struct tipc_sock *tsk, u32 sk_filter_state, 3595 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3596 { 3597 struct sock *sk = &tsk->sk; 3598 struct nlattr *attrs; 3599 struct nlattr *stat; 3600 3601 /*filter response w.r.t sk_state*/ 3602 if (!(sk_filter_state & (1 << sk->sk_state))) 3603 return 0; 3604 3605 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3606 if (!attrs) 3607 goto msg_cancel; 3608 3609 if (__tipc_nl_add_sk_info(skb, tsk)) 3610 goto attr_msg_cancel; 3611 3612 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3613 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3614 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3615 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3616 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3617 sock_i_uid(sk))) || 3618 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3619 tipc_diag_gen_cookie(sk), 3620 TIPC_NLA_SOCK_PAD)) 3621 goto attr_msg_cancel; 3622 3623 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3624 if (!stat) 3625 goto attr_msg_cancel; 3626 3627 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3628 skb_queue_len(&sk->sk_receive_queue)) || 3629 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3630 skb_queue_len(&sk->sk_write_queue)) || 3631 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3632 atomic_read(&sk->sk_drops))) 3633 goto stat_msg_cancel; 3634 3635 if (tsk->cong_link_cnt && 3636 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3637 goto stat_msg_cancel; 3638 3639 if (tsk_conn_cong(tsk) && 3640 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3641 goto stat_msg_cancel; 3642 3643 nla_nest_end(skb, stat); 3644 3645 if (tsk->group) 3646 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3647 goto stat_msg_cancel; 3648 3649 nla_nest_end(skb, attrs); 3650 3651 return 0; 3652 3653 stat_msg_cancel: 3654 nla_nest_cancel(skb, stat); 3655 attr_msg_cancel: 3656 nla_nest_cancel(skb, attrs); 3657 msg_cancel: 3658 return -EMSGSIZE; 3659 } 3660 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3661 3662 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3663 { 3664 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3665 } 3666 3667 /* Caller should hold socket lock for the passed tipc socket. */ 3668 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3669 struct netlink_callback *cb, 3670 struct publication *publ) 3671 { 3672 void *hdr; 3673 struct nlattr *attrs; 3674 3675 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3676 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3677 if (!hdr) 3678 goto msg_cancel; 3679 3680 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3681 if (!attrs) 3682 goto genlmsg_cancel; 3683 3684 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3685 goto attr_msg_cancel; 3686 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) 3687 goto attr_msg_cancel; 3688 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) 3689 goto attr_msg_cancel; 3690 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) 3691 goto attr_msg_cancel; 3692 3693 nla_nest_end(skb, attrs); 3694 genlmsg_end(skb, hdr); 3695 3696 return 0; 3697 3698 attr_msg_cancel: 3699 nla_nest_cancel(skb, attrs); 3700 genlmsg_cancel: 3701 genlmsg_cancel(skb, hdr); 3702 msg_cancel: 3703 return -EMSGSIZE; 3704 } 3705 3706 /* Caller should hold socket lock for the passed tipc socket. */ 3707 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3708 struct netlink_callback *cb, 3709 struct tipc_sock *tsk, u32 *last_publ) 3710 { 3711 int err; 3712 struct publication *p; 3713 3714 if (*last_publ) { 3715 list_for_each_entry(p, &tsk->publications, binding_sock) { 3716 if (p->key == *last_publ) 3717 break; 3718 } 3719 if (p->key != *last_publ) { 3720 /* We never set seq or call nl_dump_check_consistent() 3721 * this means that setting prev_seq here will cause the 3722 * consistence check to fail in the netlink callback 3723 * handler. Resulting in the last NLMSG_DONE message 3724 * having the NLM_F_DUMP_INTR flag set. 3725 */ 3726 cb->prev_seq = 1; 3727 *last_publ = 0; 3728 return -EPIPE; 3729 } 3730 } else { 3731 p = list_first_entry(&tsk->publications, struct publication, 3732 binding_sock); 3733 } 3734 3735 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3736 err = __tipc_nl_add_sk_publ(skb, cb, p); 3737 if (err) { 3738 *last_publ = p->key; 3739 return err; 3740 } 3741 } 3742 *last_publ = 0; 3743 3744 return 0; 3745 } 3746 3747 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3748 { 3749 int err; 3750 u32 tsk_portid = cb->args[0]; 3751 u32 last_publ = cb->args[1]; 3752 u32 done = cb->args[2]; 3753 struct net *net = sock_net(skb->sk); 3754 struct tipc_sock *tsk; 3755 3756 if (!tsk_portid) { 3757 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3758 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3759 3760 if (!attrs[TIPC_NLA_SOCK]) 3761 return -EINVAL; 3762 3763 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3764 attrs[TIPC_NLA_SOCK], 3765 tipc_nl_sock_policy, NULL); 3766 if (err) 3767 return err; 3768 3769 if (!sock[TIPC_NLA_SOCK_REF]) 3770 return -EINVAL; 3771 3772 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3773 } 3774 3775 if (done) 3776 return 0; 3777 3778 tsk = tipc_sk_lookup(net, tsk_portid); 3779 if (!tsk) 3780 return -EINVAL; 3781 3782 lock_sock(&tsk->sk); 3783 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3784 if (!err) 3785 done = 1; 3786 release_sock(&tsk->sk); 3787 sock_put(&tsk->sk); 3788 3789 cb->args[0] = tsk_portid; 3790 cb->args[1] = last_publ; 3791 cb->args[2] = done; 3792 3793 return skb->len; 3794 } 3795 3796 /** 3797 * tipc_sk_filtering - check if a socket should be traced 3798 * @sk: the socket to be examined 3799 * @sysctl_tipc_sk_filter[]: the socket tuple for filtering, 3800 * (portid, sock type, name type, name lower, name upper) 3801 * 3802 * Returns true if the socket meets the socket tuple data 3803 * (value 0 = 'any') or when there is no tuple set (all = 0), 3804 * otherwise false 3805 */ 3806 bool tipc_sk_filtering(struct sock *sk) 3807 { 3808 struct tipc_sock *tsk; 3809 struct publication *p; 3810 u32 _port, _sktype, _type, _lower, _upper; 3811 u32 type = 0, lower = 0, upper = 0; 3812 3813 if (!sk) 3814 return true; 3815 3816 tsk = tipc_sk(sk); 3817 3818 _port = sysctl_tipc_sk_filter[0]; 3819 _sktype = sysctl_tipc_sk_filter[1]; 3820 _type = sysctl_tipc_sk_filter[2]; 3821 _lower = sysctl_tipc_sk_filter[3]; 3822 _upper = sysctl_tipc_sk_filter[4]; 3823 3824 if (!_port && !_sktype && !_type && !_lower && !_upper) 3825 return true; 3826 3827 if (_port) 3828 return (_port == tsk->portid); 3829 3830 if (_sktype && _sktype != sk->sk_type) 3831 return false; 3832 3833 if (tsk->published) { 3834 p = list_first_entry_or_null(&tsk->publications, 3835 struct publication, binding_sock); 3836 if (p) { 3837 type = p->type; 3838 lower = p->lower; 3839 upper = p->upper; 3840 } 3841 } 3842 3843 if (!tipc_sk_type_connectionless(sk)) { 3844 type = tsk->conn_type; 3845 lower = tsk->conn_instance; 3846 upper = tsk->conn_instance; 3847 } 3848 3849 if ((_type && _type != type) || (_lower && _lower != lower) || 3850 (_upper && _upper != upper)) 3851 return false; 3852 3853 return true; 3854 } 3855 3856 u32 tipc_sock_get_portid(struct sock *sk) 3857 { 3858 return (sk) ? (tipc_sk(sk))->portid : 0; 3859 } 3860 3861 /** 3862 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3863 * both the rcv and backlog queues are considered 3864 * @sk: tipc sk to be checked 3865 * @skb: tipc msg to be checked 3866 * 3867 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3868 */ 3869 3870 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3871 { 3872 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3873 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3874 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3875 3876 return (qsize > lim * 90 / 100); 3877 } 3878 3879 /** 3880 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3881 * only the rcv queue is considered 3882 * @sk: tipc sk to be checked 3883 * @skb: tipc msg to be checked 3884 * 3885 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3886 */ 3887 3888 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3889 { 3890 unsigned int lim = rcvbuf_limit(sk, skb); 3891 unsigned int qsize = sk_rmem_alloc_get(sk); 3892 3893 return (qsize > lim * 90 / 100); 3894 } 3895 3896 /** 3897 * tipc_sk_dump - dump TIPC socket 3898 * @sk: tipc sk to be dumped 3899 * @dqueues: bitmask to decide if any socket queue to be dumped? 3900 * - TIPC_DUMP_NONE: don't dump socket queues 3901 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3902 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3903 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3904 * - TIPC_DUMP_ALL: dump all the socket queues above 3905 * @buf: returned buffer of dump data in format 3906 */ 3907 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3908 { 3909 int i = 0; 3910 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3911 struct tipc_sock *tsk; 3912 struct publication *p; 3913 bool tsk_connected; 3914 3915 if (!sk) { 3916 i += scnprintf(buf, sz, "sk data: (null)\n"); 3917 return i; 3918 } 3919 3920 tsk = tipc_sk(sk); 3921 tsk_connected = !tipc_sk_type_connectionless(sk); 3922 3923 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3924 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3925 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3926 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3927 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3928 if (tsk_connected) { 3929 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3930 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3931 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type); 3932 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance); 3933 } 3934 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3935 if (tsk->published) { 3936 p = list_first_entry_or_null(&tsk->publications, 3937 struct publication, binding_sock); 3938 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0); 3939 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0); 3940 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0); 3941 } 3942 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3943 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3944 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3945 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3946 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3947 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3948 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3949 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3950 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3951 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3952 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3953 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3954 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3955 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3956 3957 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3958 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3959 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3960 } 3961 3962 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3963 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3964 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3965 } 3966 3967 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 3968 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 3969 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 3970 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 3971 i += scnprintf(buf + i, sz - i, " tail "); 3972 i += tipc_skb_dump(sk->sk_backlog.tail, false, 3973 buf + i); 3974 } 3975 } 3976 3977 return i; 3978 } 3979