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