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 && maxnagle && 1578 send <= maxnagle) { 1579 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1580 if (unlikely(rc < 0)) 1581 break; 1582 blocks += rc; 1583 tsk->msg_acc++; 1584 if (blocks <= 64 && tsk->expect_ack) { 1585 tsk->snd_backlog = blocks; 1586 sent += send; 1587 break; 1588 } else if (blocks > 64) { 1589 tsk->pkt_cnt += skb_queue_len(txq); 1590 } else { 1591 skb = skb_peek_tail(txq); 1592 if (skb) { 1593 msg_set_ack_required(buf_msg(skb)); 1594 tsk->expect_ack = true; 1595 } else { 1596 tsk->expect_ack = false; 1597 } 1598 tsk->msg_acc = 0; 1599 tsk->pkt_cnt = 0; 1600 } 1601 } else { 1602 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1603 if (unlikely(rc != send)) 1604 break; 1605 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1606 } 1607 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1608 TIPC_DUMP_SK_SNDQ, " "); 1609 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1610 if (unlikely(rc == -ELINKCONG)) { 1611 tsk->cong_link_cnt = 1; 1612 rc = 0; 1613 } 1614 if (likely(!rc)) { 1615 tsk->snt_unacked += blocks; 1616 tsk->snd_backlog = 0; 1617 sent += send; 1618 } 1619 } while (sent < dlen && !rc); 1620 1621 return sent ? sent : rc; 1622 } 1623 1624 /** 1625 * tipc_send_packet - send a connection-oriented message 1626 * @sock: socket structure 1627 * @m: message to send 1628 * @dsz: length of data to be transmitted 1629 * 1630 * Used for SOCK_SEQPACKET messages. 1631 * 1632 * Returns the number of bytes sent on success, or errno otherwise 1633 */ 1634 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1635 { 1636 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1637 return -EMSGSIZE; 1638 1639 return tipc_sendstream(sock, m, dsz); 1640 } 1641 1642 /* tipc_sk_finish_conn - complete the setup of a connection 1643 */ 1644 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1645 u32 peer_node) 1646 { 1647 struct sock *sk = &tsk->sk; 1648 struct net *net = sock_net(sk); 1649 struct tipc_msg *msg = &tsk->phdr; 1650 1651 msg_set_syn(msg, 0); 1652 msg_set_destnode(msg, peer_node); 1653 msg_set_destport(msg, peer_port); 1654 msg_set_type(msg, TIPC_CONN_MSG); 1655 msg_set_lookup_scope(msg, 0); 1656 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1657 1658 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1659 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1660 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1661 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1662 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1663 tsk_set_nagle(tsk); 1664 __skb_queue_purge(&sk->sk_write_queue); 1665 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1666 return; 1667 1668 /* Fall back to message based flow control */ 1669 tsk->rcv_win = FLOWCTL_MSG_WIN; 1670 tsk->snd_win = FLOWCTL_MSG_WIN; 1671 } 1672 1673 /** 1674 * tipc_sk_set_orig_addr - capture sender's address for received message 1675 * @m: descriptor for message info 1676 * @hdr: received message header 1677 * 1678 * Note: Address is not captured if not requested by receiver. 1679 */ 1680 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1681 { 1682 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1683 struct tipc_msg *hdr = buf_msg(skb); 1684 1685 if (!srcaddr) 1686 return; 1687 1688 srcaddr->sock.family = AF_TIPC; 1689 srcaddr->sock.addrtype = TIPC_ADDR_ID; 1690 srcaddr->sock.scope = 0; 1691 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1692 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1693 srcaddr->sock.addr.name.domain = 0; 1694 m->msg_namelen = sizeof(struct sockaddr_tipc); 1695 1696 if (!msg_in_group(hdr)) 1697 return; 1698 1699 /* Group message users may also want to know sending member's id */ 1700 srcaddr->member.family = AF_TIPC; 1701 srcaddr->member.addrtype = TIPC_ADDR_NAME; 1702 srcaddr->member.scope = 0; 1703 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1704 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1705 srcaddr->member.addr.name.domain = 0; 1706 m->msg_namelen = sizeof(*srcaddr); 1707 } 1708 1709 /** 1710 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1711 * @m: descriptor for message info 1712 * @skb: received message buffer 1713 * @tsk: TIPC port associated with message 1714 * 1715 * Note: Ancillary data is not captured if not requested by receiver. 1716 * 1717 * Returns 0 if successful, otherwise errno 1718 */ 1719 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1720 struct tipc_sock *tsk) 1721 { 1722 struct tipc_msg *msg; 1723 u32 anc_data[3]; 1724 u32 err; 1725 u32 dest_type; 1726 int has_name; 1727 int res; 1728 1729 if (likely(m->msg_controllen == 0)) 1730 return 0; 1731 msg = buf_msg(skb); 1732 1733 /* Optionally capture errored message object(s) */ 1734 err = msg ? msg_errcode(msg) : 0; 1735 if (unlikely(err)) { 1736 anc_data[0] = err; 1737 anc_data[1] = msg_data_sz(msg); 1738 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); 1739 if (res) 1740 return res; 1741 if (anc_data[1]) { 1742 if (skb_linearize(skb)) 1743 return -ENOMEM; 1744 msg = buf_msg(skb); 1745 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], 1746 msg_data(msg)); 1747 if (res) 1748 return res; 1749 } 1750 } 1751 1752 /* Optionally capture message destination object */ 1753 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 1754 switch (dest_type) { 1755 case TIPC_NAMED_MSG: 1756 has_name = 1; 1757 anc_data[0] = msg_nametype(msg); 1758 anc_data[1] = msg_namelower(msg); 1759 anc_data[2] = msg_namelower(msg); 1760 break; 1761 case TIPC_MCAST_MSG: 1762 has_name = 1; 1763 anc_data[0] = msg_nametype(msg); 1764 anc_data[1] = msg_namelower(msg); 1765 anc_data[2] = msg_nameupper(msg); 1766 break; 1767 case TIPC_CONN_MSG: 1768 has_name = (tsk->conn_type != 0); 1769 anc_data[0] = tsk->conn_type; 1770 anc_data[1] = tsk->conn_instance; 1771 anc_data[2] = tsk->conn_instance; 1772 break; 1773 default: 1774 has_name = 0; 1775 } 1776 if (has_name) { 1777 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); 1778 if (res) 1779 return res; 1780 } 1781 1782 return 0; 1783 } 1784 1785 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1786 { 1787 struct sock *sk = &tsk->sk; 1788 struct sk_buff *skb = NULL; 1789 struct tipc_msg *msg; 1790 u32 peer_port = tsk_peer_port(tsk); 1791 u32 dnode = tsk_peer_node(tsk); 1792 1793 if (!tipc_sk_connected(sk)) 1794 return NULL; 1795 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1796 dnode, tsk_own_node(tsk), peer_port, 1797 tsk->portid, TIPC_OK); 1798 if (!skb) 1799 return NULL; 1800 msg = buf_msg(skb); 1801 msg_set_conn_ack(msg, tsk->rcv_unacked); 1802 tsk->rcv_unacked = 0; 1803 1804 /* Adjust to and advertize the correct window limit */ 1805 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1806 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1807 msg_set_adv_win(msg, tsk->rcv_win); 1808 } 1809 return skb; 1810 } 1811 1812 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1813 { 1814 struct sk_buff *skb; 1815 1816 skb = tipc_sk_build_ack(tsk); 1817 if (!skb) 1818 return; 1819 1820 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1821 msg_link_selector(buf_msg(skb))); 1822 } 1823 1824 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1825 { 1826 struct sock *sk = sock->sk; 1827 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1828 long timeo = *timeop; 1829 int err = sock_error(sk); 1830 1831 if (err) 1832 return err; 1833 1834 for (;;) { 1835 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1836 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1837 err = -ENOTCONN; 1838 break; 1839 } 1840 add_wait_queue(sk_sleep(sk), &wait); 1841 release_sock(sk); 1842 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1843 sched_annotate_sleep(); 1844 lock_sock(sk); 1845 remove_wait_queue(sk_sleep(sk), &wait); 1846 } 1847 err = 0; 1848 if (!skb_queue_empty(&sk->sk_receive_queue)) 1849 break; 1850 err = -EAGAIN; 1851 if (!timeo) 1852 break; 1853 err = sock_intr_errno(timeo); 1854 if (signal_pending(current)) 1855 break; 1856 1857 err = sock_error(sk); 1858 if (err) 1859 break; 1860 } 1861 *timeop = timeo; 1862 return err; 1863 } 1864 1865 /** 1866 * tipc_recvmsg - receive packet-oriented message 1867 * @m: descriptor for message info 1868 * @buflen: length of user buffer area 1869 * @flags: receive flags 1870 * 1871 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1872 * If the complete message doesn't fit in user area, truncate it. 1873 * 1874 * Returns size of returned message data, errno otherwise 1875 */ 1876 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1877 size_t buflen, int flags) 1878 { 1879 struct sock *sk = sock->sk; 1880 bool connected = !tipc_sk_type_connectionless(sk); 1881 struct tipc_sock *tsk = tipc_sk(sk); 1882 int rc, err, hlen, dlen, copy; 1883 struct sk_buff_head xmitq; 1884 struct tipc_msg *hdr; 1885 struct sk_buff *skb; 1886 bool grp_evt; 1887 long timeout; 1888 1889 /* Catch invalid receive requests */ 1890 if (unlikely(!buflen)) 1891 return -EINVAL; 1892 1893 lock_sock(sk); 1894 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1895 rc = -ENOTCONN; 1896 goto exit; 1897 } 1898 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1899 1900 /* Step rcv queue to first msg with data or error; wait if necessary */ 1901 do { 1902 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1903 if (unlikely(rc)) 1904 goto exit; 1905 skb = skb_peek(&sk->sk_receive_queue); 1906 hdr = buf_msg(skb); 1907 dlen = msg_data_sz(hdr); 1908 hlen = msg_hdr_sz(hdr); 1909 err = msg_errcode(hdr); 1910 grp_evt = msg_is_grp_evt(hdr); 1911 if (likely(dlen || err)) 1912 break; 1913 tsk_advance_rx_queue(sk); 1914 } while (1); 1915 1916 /* Collect msg meta data, including error code and rejected data */ 1917 tipc_sk_set_orig_addr(m, skb); 1918 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1919 if (unlikely(rc)) 1920 goto exit; 1921 hdr = buf_msg(skb); 1922 1923 /* Capture data if non-error msg, otherwise just set return value */ 1924 if (likely(!err)) { 1925 copy = min_t(int, dlen, buflen); 1926 if (unlikely(copy != dlen)) 1927 m->msg_flags |= MSG_TRUNC; 1928 rc = skb_copy_datagram_msg(skb, hlen, m, copy); 1929 } else { 1930 copy = 0; 1931 rc = 0; 1932 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) 1933 rc = -ECONNRESET; 1934 } 1935 if (unlikely(rc)) 1936 goto exit; 1937 1938 /* Mark message as group event if applicable */ 1939 if (unlikely(grp_evt)) { 1940 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1941 m->msg_flags |= MSG_EOR; 1942 m->msg_flags |= MSG_OOB; 1943 copy = 0; 1944 } 1945 1946 /* Caption of data or error code/rejected data was successful */ 1947 if (unlikely(flags & MSG_PEEK)) 1948 goto exit; 1949 1950 /* Send group flow control advertisement when applicable */ 1951 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1952 __skb_queue_head_init(&xmitq); 1953 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1954 msg_orignode(hdr), msg_origport(hdr), 1955 &xmitq); 1956 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1957 } 1958 1959 tsk_advance_rx_queue(sk); 1960 1961 if (likely(!connected)) 1962 goto exit; 1963 1964 /* Send connection flow control advertisement when applicable */ 1965 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1966 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1967 tipc_sk_send_ack(tsk); 1968 exit: 1969 release_sock(sk); 1970 return rc ? rc : copy; 1971 } 1972 1973 /** 1974 * tipc_recvstream - receive stream-oriented data 1975 * @m: descriptor for message info 1976 * @buflen: total size of user buffer area 1977 * @flags: receive flags 1978 * 1979 * Used for SOCK_STREAM messages only. If not enough data is available 1980 * will optionally wait for more; never truncates data. 1981 * 1982 * Returns size of returned message data, errno otherwise 1983 */ 1984 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 1985 size_t buflen, int flags) 1986 { 1987 struct sock *sk = sock->sk; 1988 struct tipc_sock *tsk = tipc_sk(sk); 1989 struct sk_buff *skb; 1990 struct tipc_msg *hdr; 1991 struct tipc_skb_cb *skb_cb; 1992 bool peek = flags & MSG_PEEK; 1993 int offset, required, copy, copied = 0; 1994 int hlen, dlen, err, rc; 1995 long timeout; 1996 1997 /* Catch invalid receive attempts */ 1998 if (unlikely(!buflen)) 1999 return -EINVAL; 2000 2001 lock_sock(sk); 2002 2003 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2004 rc = -ENOTCONN; 2005 goto exit; 2006 } 2007 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2008 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2009 2010 do { 2011 /* Look at first msg in receive queue; wait if necessary */ 2012 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2013 if (unlikely(rc)) 2014 break; 2015 skb = skb_peek(&sk->sk_receive_queue); 2016 skb_cb = TIPC_SKB_CB(skb); 2017 hdr = buf_msg(skb); 2018 dlen = msg_data_sz(hdr); 2019 hlen = msg_hdr_sz(hdr); 2020 err = msg_errcode(hdr); 2021 2022 /* Discard any empty non-errored (SYN-) message */ 2023 if (unlikely(!dlen && !err)) { 2024 tsk_advance_rx_queue(sk); 2025 continue; 2026 } 2027 2028 /* Collect msg meta data, incl. error code and rejected data */ 2029 if (!copied) { 2030 tipc_sk_set_orig_addr(m, skb); 2031 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2032 if (rc) 2033 break; 2034 hdr = buf_msg(skb); 2035 } 2036 2037 /* Copy data if msg ok, otherwise return error/partial data */ 2038 if (likely(!err)) { 2039 offset = skb_cb->bytes_read; 2040 copy = min_t(int, dlen - offset, buflen - copied); 2041 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2042 if (unlikely(rc)) 2043 break; 2044 copied += copy; 2045 offset += copy; 2046 if (unlikely(offset < dlen)) { 2047 if (!peek) 2048 skb_cb->bytes_read = offset; 2049 break; 2050 } 2051 } else { 2052 rc = 0; 2053 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2054 rc = -ECONNRESET; 2055 if (copied || rc) 2056 break; 2057 } 2058 2059 if (unlikely(peek)) 2060 break; 2061 2062 tsk_advance_rx_queue(sk); 2063 2064 /* Send connection flow control advertisement when applicable */ 2065 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2066 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2067 tipc_sk_send_ack(tsk); 2068 2069 /* Exit if all requested data or FIN/error received */ 2070 if (copied == buflen || err) 2071 break; 2072 2073 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2074 exit: 2075 release_sock(sk); 2076 return copied ? copied : rc; 2077 } 2078 2079 /** 2080 * tipc_write_space - wake up thread if port congestion is released 2081 * @sk: socket 2082 */ 2083 static void tipc_write_space(struct sock *sk) 2084 { 2085 struct socket_wq *wq; 2086 2087 rcu_read_lock(); 2088 wq = rcu_dereference(sk->sk_wq); 2089 if (skwq_has_sleeper(wq)) 2090 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2091 EPOLLWRNORM | EPOLLWRBAND); 2092 rcu_read_unlock(); 2093 } 2094 2095 /** 2096 * tipc_data_ready - wake up threads to indicate messages have been received 2097 * @sk: socket 2098 * @len: the length of messages 2099 */ 2100 static void tipc_data_ready(struct sock *sk) 2101 { 2102 struct socket_wq *wq; 2103 2104 rcu_read_lock(); 2105 wq = rcu_dereference(sk->sk_wq); 2106 if (skwq_has_sleeper(wq)) 2107 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2108 EPOLLRDNORM | EPOLLRDBAND); 2109 rcu_read_unlock(); 2110 } 2111 2112 static void tipc_sock_destruct(struct sock *sk) 2113 { 2114 __skb_queue_purge(&sk->sk_receive_queue); 2115 } 2116 2117 static void tipc_sk_proto_rcv(struct sock *sk, 2118 struct sk_buff_head *inputq, 2119 struct sk_buff_head *xmitq) 2120 { 2121 struct sk_buff *skb = __skb_dequeue(inputq); 2122 struct tipc_sock *tsk = tipc_sk(sk); 2123 struct tipc_msg *hdr = buf_msg(skb); 2124 struct tipc_group *grp = tsk->group; 2125 bool wakeup = false; 2126 2127 switch (msg_user(hdr)) { 2128 case CONN_MANAGER: 2129 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2130 return; 2131 case SOCK_WAKEUP: 2132 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2133 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2134 smp_wmb(); 2135 tsk->cong_link_cnt--; 2136 wakeup = true; 2137 tipc_sk_push_backlog(tsk, false); 2138 break; 2139 case GROUP_PROTOCOL: 2140 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2141 break; 2142 case TOP_SRV: 2143 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2144 hdr, inputq, xmitq); 2145 break; 2146 default: 2147 break; 2148 } 2149 2150 if (wakeup) 2151 sk->sk_write_space(sk); 2152 2153 kfree_skb(skb); 2154 } 2155 2156 /** 2157 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2158 * @tsk: TIPC socket 2159 * @skb: pointer to message buffer. 2160 * @xmitq: for Nagle ACK if any 2161 * Returns true if message should be added to receive queue, false otherwise 2162 */ 2163 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2164 struct sk_buff_head *xmitq) 2165 { 2166 struct sock *sk = &tsk->sk; 2167 struct net *net = sock_net(sk); 2168 struct tipc_msg *hdr = buf_msg(skb); 2169 bool con_msg = msg_connected(hdr); 2170 u32 pport = tsk_peer_port(tsk); 2171 u32 pnode = tsk_peer_node(tsk); 2172 u32 oport = msg_origport(hdr); 2173 u32 onode = msg_orignode(hdr); 2174 int err = msg_errcode(hdr); 2175 unsigned long delay; 2176 2177 if (unlikely(msg_mcast(hdr))) 2178 return false; 2179 tsk->oneway = 0; 2180 2181 switch (sk->sk_state) { 2182 case TIPC_CONNECTING: 2183 /* Setup ACK */ 2184 if (likely(con_msg)) { 2185 if (err) 2186 break; 2187 tipc_sk_finish_conn(tsk, oport, onode); 2188 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2189 /* ACK+ message with data is added to receive queue */ 2190 if (msg_data_sz(hdr)) 2191 return true; 2192 /* Empty ACK-, - wake up sleeping connect() and drop */ 2193 sk->sk_state_change(sk); 2194 msg_set_dest_droppable(hdr, 1); 2195 return false; 2196 } 2197 /* Ignore connectionless message if not from listening socket */ 2198 if (oport != pport || onode != pnode) 2199 return false; 2200 2201 /* Rejected SYN */ 2202 if (err != TIPC_ERR_OVERLOAD) 2203 break; 2204 2205 /* Prepare for new setup attempt if we have a SYN clone */ 2206 if (skb_queue_empty(&sk->sk_write_queue)) 2207 break; 2208 get_random_bytes(&delay, 2); 2209 delay %= (tsk->conn_timeout / 4); 2210 delay = msecs_to_jiffies(delay + 100); 2211 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2212 return false; 2213 case TIPC_OPEN: 2214 case TIPC_DISCONNECTING: 2215 return false; 2216 case TIPC_LISTEN: 2217 /* Accept only SYN message */ 2218 if (!msg_is_syn(hdr) && 2219 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2220 return false; 2221 if (!con_msg && !err) 2222 return true; 2223 return false; 2224 case TIPC_ESTABLISHED: 2225 if (!skb_queue_empty(&sk->sk_write_queue)) 2226 tipc_sk_push_backlog(tsk, false); 2227 /* Accept only connection-based messages sent by peer */ 2228 if (likely(con_msg && !err && pport == oport && 2229 pnode == onode)) { 2230 if (msg_ack_required(hdr)) { 2231 struct sk_buff *skb; 2232 2233 skb = tipc_sk_build_ack(tsk); 2234 if (skb) { 2235 msg_set_nagle_ack(buf_msg(skb)); 2236 __skb_queue_tail(xmitq, skb); 2237 } 2238 } 2239 return true; 2240 } 2241 if (!tsk_peer_msg(tsk, hdr)) 2242 return false; 2243 if (!err) 2244 return true; 2245 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2246 tipc_node_remove_conn(net, pnode, tsk->portid); 2247 sk->sk_state_change(sk); 2248 return true; 2249 default: 2250 pr_err("Unknown sk_state %u\n", sk->sk_state); 2251 } 2252 /* Abort connection setup attempt */ 2253 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2254 sk->sk_err = ECONNREFUSED; 2255 sk->sk_state_change(sk); 2256 return true; 2257 } 2258 2259 /** 2260 * rcvbuf_limit - get proper overload limit of socket receive queue 2261 * @sk: socket 2262 * @skb: message 2263 * 2264 * For connection oriented messages, irrespective of importance, 2265 * default queue limit is 2 MB. 2266 * 2267 * For connectionless messages, queue limits are based on message 2268 * importance as follows: 2269 * 2270 * TIPC_LOW_IMPORTANCE (2 MB) 2271 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2272 * TIPC_HIGH_IMPORTANCE (8 MB) 2273 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2274 * 2275 * Returns overload limit according to corresponding message importance 2276 */ 2277 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2278 { 2279 struct tipc_sock *tsk = tipc_sk(sk); 2280 struct tipc_msg *hdr = buf_msg(skb); 2281 2282 if (unlikely(msg_in_group(hdr))) 2283 return READ_ONCE(sk->sk_rcvbuf); 2284 2285 if (unlikely(!msg_connected(hdr))) 2286 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2287 2288 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2289 return READ_ONCE(sk->sk_rcvbuf); 2290 2291 return FLOWCTL_MSG_LIM; 2292 } 2293 2294 /** 2295 * tipc_sk_filter_rcv - validate incoming message 2296 * @sk: socket 2297 * @skb: pointer to message. 2298 * 2299 * Enqueues message on receive queue if acceptable; optionally handles 2300 * disconnect indication for a connected socket. 2301 * 2302 * Called with socket lock already taken 2303 * 2304 */ 2305 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2306 struct sk_buff_head *xmitq) 2307 { 2308 bool sk_conn = !tipc_sk_type_connectionless(sk); 2309 struct tipc_sock *tsk = tipc_sk(sk); 2310 struct tipc_group *grp = tsk->group; 2311 struct tipc_msg *hdr = buf_msg(skb); 2312 struct net *net = sock_net(sk); 2313 struct sk_buff_head inputq; 2314 int mtyp = msg_type(hdr); 2315 int limit, err = TIPC_OK; 2316 2317 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2318 TIPC_SKB_CB(skb)->bytes_read = 0; 2319 __skb_queue_head_init(&inputq); 2320 __skb_queue_tail(&inputq, skb); 2321 2322 if (unlikely(!msg_isdata(hdr))) 2323 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2324 2325 if (unlikely(grp)) 2326 tipc_group_filter_msg(grp, &inputq, xmitq); 2327 2328 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2329 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2330 2331 /* Validate and add to receive buffer if there is space */ 2332 while ((skb = __skb_dequeue(&inputq))) { 2333 hdr = buf_msg(skb); 2334 limit = rcvbuf_limit(sk, skb); 2335 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2336 (!sk_conn && msg_connected(hdr)) || 2337 (!grp && msg_in_group(hdr))) 2338 err = TIPC_ERR_NO_PORT; 2339 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2340 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2341 "err_overload2!"); 2342 atomic_inc(&sk->sk_drops); 2343 err = TIPC_ERR_OVERLOAD; 2344 } 2345 2346 if (unlikely(err)) { 2347 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2348 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2349 "@filter_rcv!"); 2350 __skb_queue_tail(xmitq, skb); 2351 } 2352 err = TIPC_OK; 2353 continue; 2354 } 2355 __skb_queue_tail(&sk->sk_receive_queue, skb); 2356 skb_set_owner_r(skb, sk); 2357 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2358 "rcvq >90% allocated!"); 2359 sk->sk_data_ready(sk); 2360 } 2361 } 2362 2363 /** 2364 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2365 * @sk: socket 2366 * @skb: message 2367 * 2368 * Caller must hold socket lock 2369 */ 2370 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2371 { 2372 unsigned int before = sk_rmem_alloc_get(sk); 2373 struct sk_buff_head xmitq; 2374 unsigned int added; 2375 2376 __skb_queue_head_init(&xmitq); 2377 2378 tipc_sk_filter_rcv(sk, skb, &xmitq); 2379 added = sk_rmem_alloc_get(sk) - before; 2380 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2381 2382 /* Send pending response/rejected messages, if any */ 2383 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2384 return 0; 2385 } 2386 2387 /** 2388 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2389 * inputq and try adding them to socket or backlog queue 2390 * @inputq: list of incoming buffers with potentially different destinations 2391 * @sk: socket where the buffers should be enqueued 2392 * @dport: port number for the socket 2393 * 2394 * Caller must hold socket lock 2395 */ 2396 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2397 u32 dport, struct sk_buff_head *xmitq) 2398 { 2399 unsigned long time_limit = jiffies + 2; 2400 struct sk_buff *skb; 2401 unsigned int lim; 2402 atomic_t *dcnt; 2403 u32 onode; 2404 2405 while (skb_queue_len(inputq)) { 2406 if (unlikely(time_after_eq(jiffies, time_limit))) 2407 return; 2408 2409 skb = tipc_skb_dequeue(inputq, dport); 2410 if (unlikely(!skb)) 2411 return; 2412 2413 /* Add message directly to receive queue if possible */ 2414 if (!sock_owned_by_user(sk)) { 2415 tipc_sk_filter_rcv(sk, skb, xmitq); 2416 continue; 2417 } 2418 2419 /* Try backlog, compensating for double-counted bytes */ 2420 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2421 if (!sk->sk_backlog.len) 2422 atomic_set(dcnt, 0); 2423 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2424 if (likely(!sk_add_backlog(sk, skb, lim))) { 2425 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2426 "bklg & rcvq >90% allocated!"); 2427 continue; 2428 } 2429 2430 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2431 /* Overload => reject message back to sender */ 2432 onode = tipc_own_addr(sock_net(sk)); 2433 atomic_inc(&sk->sk_drops); 2434 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2435 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2436 "@sk_enqueue!"); 2437 __skb_queue_tail(xmitq, skb); 2438 } 2439 break; 2440 } 2441 } 2442 2443 /** 2444 * tipc_sk_rcv - handle a chain of incoming buffers 2445 * @inputq: buffer list containing the buffers 2446 * Consumes all buffers in list until inputq is empty 2447 * Note: may be called in multiple threads referring to the same queue 2448 */ 2449 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2450 { 2451 struct sk_buff_head xmitq; 2452 u32 dnode, dport = 0; 2453 int err; 2454 struct tipc_sock *tsk; 2455 struct sock *sk; 2456 struct sk_buff *skb; 2457 2458 __skb_queue_head_init(&xmitq); 2459 while (skb_queue_len(inputq)) { 2460 dport = tipc_skb_peek_port(inputq, dport); 2461 tsk = tipc_sk_lookup(net, dport); 2462 2463 if (likely(tsk)) { 2464 sk = &tsk->sk; 2465 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2466 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2467 spin_unlock_bh(&sk->sk_lock.slock); 2468 } 2469 /* Send pending response/rejected messages, if any */ 2470 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2471 sock_put(sk); 2472 continue; 2473 } 2474 /* No destination socket => dequeue skb if still there */ 2475 skb = tipc_skb_dequeue(inputq, dport); 2476 if (!skb) 2477 return; 2478 2479 /* Try secondary lookup if unresolved named message */ 2480 err = TIPC_ERR_NO_PORT; 2481 if (tipc_msg_lookup_dest(net, skb, &err)) 2482 goto xmit; 2483 2484 /* Prepare for message rejection */ 2485 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2486 continue; 2487 2488 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2489 xmit: 2490 dnode = msg_destnode(buf_msg(skb)); 2491 tipc_node_xmit_skb(net, skb, dnode, dport); 2492 } 2493 } 2494 2495 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2496 { 2497 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2498 struct sock *sk = sock->sk; 2499 int done; 2500 2501 do { 2502 int err = sock_error(sk); 2503 if (err) 2504 return err; 2505 if (!*timeo_p) 2506 return -ETIMEDOUT; 2507 if (signal_pending(current)) 2508 return sock_intr_errno(*timeo_p); 2509 if (sk->sk_state == TIPC_DISCONNECTING) 2510 break; 2511 2512 add_wait_queue(sk_sleep(sk), &wait); 2513 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2514 &wait); 2515 remove_wait_queue(sk_sleep(sk), &wait); 2516 } while (!done); 2517 return 0; 2518 } 2519 2520 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2521 { 2522 if (addr->family != AF_TIPC) 2523 return false; 2524 if (addr->addrtype == TIPC_SERVICE_RANGE) 2525 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2526 return (addr->addrtype == TIPC_SERVICE_ADDR || 2527 addr->addrtype == TIPC_SOCKET_ADDR); 2528 } 2529 2530 /** 2531 * tipc_connect - establish a connection to another TIPC port 2532 * @sock: socket structure 2533 * @dest: socket address for destination port 2534 * @destlen: size of socket address data structure 2535 * @flags: file-related flags associated with socket 2536 * 2537 * Returns 0 on success, errno otherwise 2538 */ 2539 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2540 int destlen, int flags) 2541 { 2542 struct sock *sk = sock->sk; 2543 struct tipc_sock *tsk = tipc_sk(sk); 2544 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2545 struct msghdr m = {NULL,}; 2546 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2547 int previous; 2548 int res = 0; 2549 2550 if (destlen != sizeof(struct sockaddr_tipc)) 2551 return -EINVAL; 2552 2553 lock_sock(sk); 2554 2555 if (tsk->group) { 2556 res = -EINVAL; 2557 goto exit; 2558 } 2559 2560 if (dst->family == AF_UNSPEC) { 2561 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2562 if (!tipc_sk_type_connectionless(sk)) 2563 res = -EINVAL; 2564 goto exit; 2565 } 2566 if (!tipc_sockaddr_is_sane(dst)) { 2567 res = -EINVAL; 2568 goto exit; 2569 } 2570 /* DGRAM/RDM connect(), just save the destaddr */ 2571 if (tipc_sk_type_connectionless(sk)) { 2572 memcpy(&tsk->peer, dest, destlen); 2573 goto exit; 2574 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2575 res = -EINVAL; 2576 goto exit; 2577 } 2578 2579 previous = sk->sk_state; 2580 2581 switch (sk->sk_state) { 2582 case TIPC_OPEN: 2583 /* Send a 'SYN-' to destination */ 2584 m.msg_name = dest; 2585 m.msg_namelen = destlen; 2586 2587 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2588 * indicate send_msg() is never blocked. 2589 */ 2590 if (!timeout) 2591 m.msg_flags = MSG_DONTWAIT; 2592 2593 res = __tipc_sendmsg(sock, &m, 0); 2594 if ((res < 0) && (res != -EWOULDBLOCK)) 2595 goto exit; 2596 2597 /* Just entered TIPC_CONNECTING state; the only 2598 * difference is that return value in non-blocking 2599 * case is EINPROGRESS, rather than EALREADY. 2600 */ 2601 res = -EINPROGRESS; 2602 /* fall through */ 2603 case TIPC_CONNECTING: 2604 if (!timeout) { 2605 if (previous == TIPC_CONNECTING) 2606 res = -EALREADY; 2607 goto exit; 2608 } 2609 timeout = msecs_to_jiffies(timeout); 2610 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2611 res = tipc_wait_for_connect(sock, &timeout); 2612 break; 2613 case TIPC_ESTABLISHED: 2614 res = -EISCONN; 2615 break; 2616 default: 2617 res = -EINVAL; 2618 } 2619 2620 exit: 2621 release_sock(sk); 2622 return res; 2623 } 2624 2625 /** 2626 * tipc_listen - allow socket to listen for incoming connections 2627 * @sock: socket structure 2628 * @len: (unused) 2629 * 2630 * Returns 0 on success, errno otherwise 2631 */ 2632 static int tipc_listen(struct socket *sock, int len) 2633 { 2634 struct sock *sk = sock->sk; 2635 int res; 2636 2637 lock_sock(sk); 2638 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2639 release_sock(sk); 2640 2641 return res; 2642 } 2643 2644 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2645 { 2646 struct sock *sk = sock->sk; 2647 DEFINE_WAIT(wait); 2648 int err; 2649 2650 /* True wake-one mechanism for incoming connections: only 2651 * one process gets woken up, not the 'whole herd'. 2652 * Since we do not 'race & poll' for established sockets 2653 * anymore, the common case will execute the loop only once. 2654 */ 2655 for (;;) { 2656 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 2657 TASK_INTERRUPTIBLE); 2658 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2659 release_sock(sk); 2660 timeo = schedule_timeout(timeo); 2661 lock_sock(sk); 2662 } 2663 err = 0; 2664 if (!skb_queue_empty(&sk->sk_receive_queue)) 2665 break; 2666 err = -EAGAIN; 2667 if (!timeo) 2668 break; 2669 err = sock_intr_errno(timeo); 2670 if (signal_pending(current)) 2671 break; 2672 } 2673 finish_wait(sk_sleep(sk), &wait); 2674 return err; 2675 } 2676 2677 /** 2678 * tipc_accept - wait for connection request 2679 * @sock: listening socket 2680 * @newsock: new socket that is to be connected 2681 * @flags: file-related flags associated with socket 2682 * 2683 * Returns 0 on success, errno otherwise 2684 */ 2685 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2686 bool kern) 2687 { 2688 struct sock *new_sk, *sk = sock->sk; 2689 struct sk_buff *buf; 2690 struct tipc_sock *new_tsock; 2691 struct tipc_msg *msg; 2692 long timeo; 2693 int res; 2694 2695 lock_sock(sk); 2696 2697 if (sk->sk_state != TIPC_LISTEN) { 2698 res = -EINVAL; 2699 goto exit; 2700 } 2701 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2702 res = tipc_wait_for_accept(sock, timeo); 2703 if (res) 2704 goto exit; 2705 2706 buf = skb_peek(&sk->sk_receive_queue); 2707 2708 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2709 if (res) 2710 goto exit; 2711 security_sk_clone(sock->sk, new_sock->sk); 2712 2713 new_sk = new_sock->sk; 2714 new_tsock = tipc_sk(new_sk); 2715 msg = buf_msg(buf); 2716 2717 /* we lock on new_sk; but lockdep sees the lock on sk */ 2718 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2719 2720 /* 2721 * Reject any stray messages received by new socket 2722 * before the socket lock was taken (very, very unlikely) 2723 */ 2724 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2725 2726 /* Connect new socket to it's peer */ 2727 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2728 2729 tsk_set_importance(new_sk, msg_importance(msg)); 2730 if (msg_named(msg)) { 2731 new_tsock->conn_type = msg_nametype(msg); 2732 new_tsock->conn_instance = msg_nameinst(msg); 2733 } 2734 2735 /* 2736 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 2737 * Respond to 'SYN+' by queuing it on new socket. 2738 */ 2739 if (!msg_data_sz(msg)) { 2740 struct msghdr m = {NULL,}; 2741 2742 tsk_advance_rx_queue(sk); 2743 __tipc_sendstream(new_sock, &m, 0); 2744 } else { 2745 __skb_dequeue(&sk->sk_receive_queue); 2746 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2747 skb_set_owner_r(buf, new_sk); 2748 } 2749 release_sock(new_sk); 2750 exit: 2751 release_sock(sk); 2752 return res; 2753 } 2754 2755 /** 2756 * tipc_shutdown - shutdown socket connection 2757 * @sock: socket structure 2758 * @how: direction to close (must be SHUT_RDWR) 2759 * 2760 * Terminates connection (if necessary), then purges socket's receive queue. 2761 * 2762 * Returns 0 on success, errno otherwise 2763 */ 2764 static int tipc_shutdown(struct socket *sock, int how) 2765 { 2766 struct sock *sk = sock->sk; 2767 int res; 2768 2769 if (how != SHUT_RDWR) 2770 return -EINVAL; 2771 2772 lock_sock(sk); 2773 2774 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2775 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2776 sk->sk_shutdown = SEND_SHUTDOWN; 2777 2778 if (sk->sk_state == TIPC_DISCONNECTING) { 2779 /* Discard any unreceived messages */ 2780 __skb_queue_purge(&sk->sk_receive_queue); 2781 2782 /* Wake up anyone sleeping in poll */ 2783 sk->sk_state_change(sk); 2784 res = 0; 2785 } else { 2786 res = -ENOTCONN; 2787 } 2788 2789 release_sock(sk); 2790 return res; 2791 } 2792 2793 static void tipc_sk_check_probing_state(struct sock *sk, 2794 struct sk_buff_head *list) 2795 { 2796 struct tipc_sock *tsk = tipc_sk(sk); 2797 u32 pnode = tsk_peer_node(tsk); 2798 u32 pport = tsk_peer_port(tsk); 2799 u32 self = tsk_own_node(tsk); 2800 u32 oport = tsk->portid; 2801 struct sk_buff *skb; 2802 2803 if (tsk->probe_unacked) { 2804 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2805 sk->sk_err = ECONNABORTED; 2806 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2807 sk->sk_state_change(sk); 2808 return; 2809 } 2810 /* Prepare new probe */ 2811 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2812 pnode, self, pport, oport, TIPC_OK); 2813 if (skb) 2814 __skb_queue_tail(list, skb); 2815 tsk->probe_unacked = true; 2816 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2817 } 2818 2819 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2820 { 2821 struct tipc_sock *tsk = tipc_sk(sk); 2822 2823 /* Try again later if dest link is congested */ 2824 if (tsk->cong_link_cnt) { 2825 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2826 return; 2827 } 2828 /* Prepare SYN for retransmit */ 2829 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2830 } 2831 2832 static void tipc_sk_timeout(struct timer_list *t) 2833 { 2834 struct sock *sk = from_timer(sk, t, sk_timer); 2835 struct tipc_sock *tsk = tipc_sk(sk); 2836 u32 pnode = tsk_peer_node(tsk); 2837 struct sk_buff_head list; 2838 int rc = 0; 2839 2840 __skb_queue_head_init(&list); 2841 bh_lock_sock(sk); 2842 2843 /* Try again later if socket is busy */ 2844 if (sock_owned_by_user(sk)) { 2845 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2846 bh_unlock_sock(sk); 2847 sock_put(sk); 2848 return; 2849 } 2850 2851 if (sk->sk_state == TIPC_ESTABLISHED) 2852 tipc_sk_check_probing_state(sk, &list); 2853 else if (sk->sk_state == TIPC_CONNECTING) 2854 tipc_sk_retry_connect(sk, &list); 2855 2856 bh_unlock_sock(sk); 2857 2858 if (!skb_queue_empty(&list)) 2859 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2860 2861 /* SYN messages may cause link congestion */ 2862 if (rc == -ELINKCONG) { 2863 tipc_dest_push(&tsk->cong_links, pnode, 0); 2864 tsk->cong_link_cnt = 1; 2865 } 2866 sock_put(sk); 2867 } 2868 2869 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 2870 struct tipc_name_seq const *seq) 2871 { 2872 struct sock *sk = &tsk->sk; 2873 struct net *net = sock_net(sk); 2874 struct publication *publ; 2875 u32 key; 2876 2877 if (scope != TIPC_NODE_SCOPE) 2878 scope = TIPC_CLUSTER_SCOPE; 2879 2880 if (tipc_sk_connected(sk)) 2881 return -EINVAL; 2882 key = tsk->portid + tsk->pub_count + 1; 2883 if (key == tsk->portid) 2884 return -EADDRINUSE; 2885 2886 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper, 2887 scope, tsk->portid, key); 2888 if (unlikely(!publ)) 2889 return -EINVAL; 2890 2891 list_add(&publ->binding_sock, &tsk->publications); 2892 tsk->pub_count++; 2893 tsk->published = 1; 2894 return 0; 2895 } 2896 2897 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 2898 struct tipc_name_seq const *seq) 2899 { 2900 struct net *net = sock_net(&tsk->sk); 2901 struct publication *publ; 2902 struct publication *safe; 2903 int rc = -EINVAL; 2904 2905 if (scope != TIPC_NODE_SCOPE) 2906 scope = TIPC_CLUSTER_SCOPE; 2907 2908 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) { 2909 if (seq) { 2910 if (publ->scope != scope) 2911 continue; 2912 if (publ->type != seq->type) 2913 continue; 2914 if (publ->lower != seq->lower) 2915 continue; 2916 if (publ->upper != seq->upper) 2917 break; 2918 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2919 publ->upper, publ->key); 2920 rc = 0; 2921 break; 2922 } 2923 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2924 publ->upper, publ->key); 2925 rc = 0; 2926 } 2927 if (list_empty(&tsk->publications)) 2928 tsk->published = 0; 2929 return rc; 2930 } 2931 2932 /* tipc_sk_reinit: set non-zero address in all existing sockets 2933 * when we go from standalone to network mode. 2934 */ 2935 void tipc_sk_reinit(struct net *net) 2936 { 2937 struct tipc_net *tn = net_generic(net, tipc_net_id); 2938 struct rhashtable_iter iter; 2939 struct tipc_sock *tsk; 2940 struct tipc_msg *msg; 2941 2942 rhashtable_walk_enter(&tn->sk_rht, &iter); 2943 2944 do { 2945 rhashtable_walk_start(&iter); 2946 2947 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2948 sock_hold(&tsk->sk); 2949 rhashtable_walk_stop(&iter); 2950 lock_sock(&tsk->sk); 2951 msg = &tsk->phdr; 2952 msg_set_prevnode(msg, tipc_own_addr(net)); 2953 msg_set_orignode(msg, tipc_own_addr(net)); 2954 release_sock(&tsk->sk); 2955 rhashtable_walk_start(&iter); 2956 sock_put(&tsk->sk); 2957 } 2958 2959 rhashtable_walk_stop(&iter); 2960 } while (tsk == ERR_PTR(-EAGAIN)); 2961 2962 rhashtable_walk_exit(&iter); 2963 } 2964 2965 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2966 { 2967 struct tipc_net *tn = net_generic(net, tipc_net_id); 2968 struct tipc_sock *tsk; 2969 2970 rcu_read_lock(); 2971 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2972 if (tsk) 2973 sock_hold(&tsk->sk); 2974 rcu_read_unlock(); 2975 2976 return tsk; 2977 } 2978 2979 static int tipc_sk_insert(struct tipc_sock *tsk) 2980 { 2981 struct sock *sk = &tsk->sk; 2982 struct net *net = sock_net(sk); 2983 struct tipc_net *tn = net_generic(net, tipc_net_id); 2984 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 2985 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 2986 2987 while (remaining--) { 2988 portid++; 2989 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 2990 portid = TIPC_MIN_PORT; 2991 tsk->portid = portid; 2992 sock_hold(&tsk->sk); 2993 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 2994 tsk_rht_params)) 2995 return 0; 2996 sock_put(&tsk->sk); 2997 } 2998 2999 return -1; 3000 } 3001 3002 static void tipc_sk_remove(struct tipc_sock *tsk) 3003 { 3004 struct sock *sk = &tsk->sk; 3005 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3006 3007 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3008 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3009 __sock_put(sk); 3010 } 3011 } 3012 3013 static const struct rhashtable_params tsk_rht_params = { 3014 .nelem_hint = 192, 3015 .head_offset = offsetof(struct tipc_sock, node), 3016 .key_offset = offsetof(struct tipc_sock, portid), 3017 .key_len = sizeof(u32), /* portid */ 3018 .max_size = 1048576, 3019 .min_size = 256, 3020 .automatic_shrinking = true, 3021 }; 3022 3023 int tipc_sk_rht_init(struct net *net) 3024 { 3025 struct tipc_net *tn = net_generic(net, tipc_net_id); 3026 3027 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3028 } 3029 3030 void tipc_sk_rht_destroy(struct net *net) 3031 { 3032 struct tipc_net *tn = net_generic(net, tipc_net_id); 3033 3034 /* Wait for socket readers to complete */ 3035 synchronize_net(); 3036 3037 rhashtable_destroy(&tn->sk_rht); 3038 } 3039 3040 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3041 { 3042 struct net *net = sock_net(&tsk->sk); 3043 struct tipc_group *grp = tsk->group; 3044 struct tipc_msg *hdr = &tsk->phdr; 3045 struct tipc_name_seq seq; 3046 int rc; 3047 3048 if (mreq->type < TIPC_RESERVED_TYPES) 3049 return -EACCES; 3050 if (mreq->scope > TIPC_NODE_SCOPE) 3051 return -EINVAL; 3052 if (grp) 3053 return -EACCES; 3054 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3055 if (!grp) 3056 return -ENOMEM; 3057 tsk->group = grp; 3058 msg_set_lookup_scope(hdr, mreq->scope); 3059 msg_set_nametype(hdr, mreq->type); 3060 msg_set_dest_droppable(hdr, true); 3061 seq.type = mreq->type; 3062 seq.lower = mreq->instance; 3063 seq.upper = seq.lower; 3064 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope); 3065 rc = tipc_sk_publish(tsk, mreq->scope, &seq); 3066 if (rc) { 3067 tipc_group_delete(net, grp); 3068 tsk->group = NULL; 3069 return rc; 3070 } 3071 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3072 tsk->mc_method.rcast = true; 3073 tsk->mc_method.mandatory = true; 3074 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3075 return rc; 3076 } 3077 3078 static int tipc_sk_leave(struct tipc_sock *tsk) 3079 { 3080 struct net *net = sock_net(&tsk->sk); 3081 struct tipc_group *grp = tsk->group; 3082 struct tipc_name_seq seq; 3083 int scope; 3084 3085 if (!grp) 3086 return -EINVAL; 3087 tipc_group_self(grp, &seq, &scope); 3088 tipc_group_delete(net, grp); 3089 tsk->group = NULL; 3090 tipc_sk_withdraw(tsk, scope, &seq); 3091 return 0; 3092 } 3093 3094 /** 3095 * tipc_setsockopt - set socket option 3096 * @sock: socket structure 3097 * @lvl: option level 3098 * @opt: option identifier 3099 * @ov: pointer to new option value 3100 * @ol: length of option value 3101 * 3102 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3103 * (to ease compatibility). 3104 * 3105 * Returns 0 on success, errno otherwise 3106 */ 3107 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3108 char __user *ov, unsigned int ol) 3109 { 3110 struct sock *sk = sock->sk; 3111 struct tipc_sock *tsk = tipc_sk(sk); 3112 struct tipc_group_req mreq; 3113 u32 value = 0; 3114 int res = 0; 3115 3116 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3117 return 0; 3118 if (lvl != SOL_TIPC) 3119 return -ENOPROTOOPT; 3120 3121 switch (opt) { 3122 case TIPC_IMPORTANCE: 3123 case TIPC_SRC_DROPPABLE: 3124 case TIPC_DEST_DROPPABLE: 3125 case TIPC_CONN_TIMEOUT: 3126 case TIPC_NODELAY: 3127 if (ol < sizeof(value)) 3128 return -EINVAL; 3129 if (get_user(value, (u32 __user *)ov)) 3130 return -EFAULT; 3131 break; 3132 case TIPC_GROUP_JOIN: 3133 if (ol < sizeof(mreq)) 3134 return -EINVAL; 3135 if (copy_from_user(&mreq, ov, sizeof(mreq))) 3136 return -EFAULT; 3137 break; 3138 default: 3139 if (ov || ol) 3140 return -EINVAL; 3141 } 3142 3143 lock_sock(sk); 3144 3145 switch (opt) { 3146 case TIPC_IMPORTANCE: 3147 res = tsk_set_importance(sk, value); 3148 break; 3149 case TIPC_SRC_DROPPABLE: 3150 if (sock->type != SOCK_STREAM) 3151 tsk_set_unreliable(tsk, value); 3152 else 3153 res = -ENOPROTOOPT; 3154 break; 3155 case TIPC_DEST_DROPPABLE: 3156 tsk_set_unreturnable(tsk, value); 3157 break; 3158 case TIPC_CONN_TIMEOUT: 3159 tipc_sk(sk)->conn_timeout = value; 3160 break; 3161 case TIPC_MCAST_BROADCAST: 3162 tsk->mc_method.rcast = false; 3163 tsk->mc_method.mandatory = true; 3164 break; 3165 case TIPC_MCAST_REPLICAST: 3166 tsk->mc_method.rcast = true; 3167 tsk->mc_method.mandatory = true; 3168 break; 3169 case TIPC_GROUP_JOIN: 3170 res = tipc_sk_join(tsk, &mreq); 3171 break; 3172 case TIPC_GROUP_LEAVE: 3173 res = tipc_sk_leave(tsk); 3174 break; 3175 case TIPC_NODELAY: 3176 tsk->nodelay = !!value; 3177 tsk_set_nagle(tsk); 3178 break; 3179 default: 3180 res = -EINVAL; 3181 } 3182 3183 release_sock(sk); 3184 3185 return res; 3186 } 3187 3188 /** 3189 * tipc_getsockopt - get socket option 3190 * @sock: socket structure 3191 * @lvl: option level 3192 * @opt: option identifier 3193 * @ov: receptacle for option value 3194 * @ol: receptacle for length of option value 3195 * 3196 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3197 * (to ease compatibility). 3198 * 3199 * Returns 0 on success, errno otherwise 3200 */ 3201 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3202 char __user *ov, int __user *ol) 3203 { 3204 struct sock *sk = sock->sk; 3205 struct tipc_sock *tsk = tipc_sk(sk); 3206 struct tipc_name_seq seq; 3207 int len, scope; 3208 u32 value; 3209 int res; 3210 3211 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3212 return put_user(0, ol); 3213 if (lvl != SOL_TIPC) 3214 return -ENOPROTOOPT; 3215 res = get_user(len, ol); 3216 if (res) 3217 return res; 3218 3219 lock_sock(sk); 3220 3221 switch (opt) { 3222 case TIPC_IMPORTANCE: 3223 value = tsk_importance(tsk); 3224 break; 3225 case TIPC_SRC_DROPPABLE: 3226 value = tsk_unreliable(tsk); 3227 break; 3228 case TIPC_DEST_DROPPABLE: 3229 value = tsk_unreturnable(tsk); 3230 break; 3231 case TIPC_CONN_TIMEOUT: 3232 value = tsk->conn_timeout; 3233 /* no need to set "res", since already 0 at this point */ 3234 break; 3235 case TIPC_NODE_RECVQ_DEPTH: 3236 value = 0; /* was tipc_queue_size, now obsolete */ 3237 break; 3238 case TIPC_SOCK_RECVQ_DEPTH: 3239 value = skb_queue_len(&sk->sk_receive_queue); 3240 break; 3241 case TIPC_SOCK_RECVQ_USED: 3242 value = sk_rmem_alloc_get(sk); 3243 break; 3244 case TIPC_GROUP_JOIN: 3245 seq.type = 0; 3246 if (tsk->group) 3247 tipc_group_self(tsk->group, &seq, &scope); 3248 value = seq.type; 3249 break; 3250 default: 3251 res = -EINVAL; 3252 } 3253 3254 release_sock(sk); 3255 3256 if (res) 3257 return res; /* "get" failed */ 3258 3259 if (len < sizeof(value)) 3260 return -EINVAL; 3261 3262 if (copy_to_user(ov, &value, sizeof(value))) 3263 return -EFAULT; 3264 3265 return put_user(sizeof(value), ol); 3266 } 3267 3268 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3269 { 3270 struct net *net = sock_net(sock->sk); 3271 struct tipc_sioc_nodeid_req nr = {0}; 3272 struct tipc_sioc_ln_req lnr; 3273 void __user *argp = (void __user *)arg; 3274 3275 switch (cmd) { 3276 case SIOCGETLINKNAME: 3277 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3278 return -EFAULT; 3279 if (!tipc_node_get_linkname(net, 3280 lnr.bearer_id & 0xffff, lnr.peer, 3281 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3282 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3283 return -EFAULT; 3284 return 0; 3285 } 3286 return -EADDRNOTAVAIL; 3287 case SIOCGETNODEID: 3288 if (copy_from_user(&nr, argp, sizeof(nr))) 3289 return -EFAULT; 3290 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3291 return -EADDRNOTAVAIL; 3292 if (copy_to_user(argp, &nr, sizeof(nr))) 3293 return -EFAULT; 3294 return 0; 3295 default: 3296 return -ENOIOCTLCMD; 3297 } 3298 } 3299 3300 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3301 { 3302 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3303 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3304 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3305 3306 tsk1->peer.family = AF_TIPC; 3307 tsk1->peer.addrtype = TIPC_ADDR_ID; 3308 tsk1->peer.scope = TIPC_NODE_SCOPE; 3309 tsk1->peer.addr.id.ref = tsk2->portid; 3310 tsk1->peer.addr.id.node = onode; 3311 tsk2->peer.family = AF_TIPC; 3312 tsk2->peer.addrtype = TIPC_ADDR_ID; 3313 tsk2->peer.scope = TIPC_NODE_SCOPE; 3314 tsk2->peer.addr.id.ref = tsk1->portid; 3315 tsk2->peer.addr.id.node = onode; 3316 3317 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3318 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3319 return 0; 3320 } 3321 3322 /* Protocol switches for the various types of TIPC sockets */ 3323 3324 static const struct proto_ops msg_ops = { 3325 .owner = THIS_MODULE, 3326 .family = AF_TIPC, 3327 .release = tipc_release, 3328 .bind = tipc_bind, 3329 .connect = tipc_connect, 3330 .socketpair = tipc_socketpair, 3331 .accept = sock_no_accept, 3332 .getname = tipc_getname, 3333 .poll = tipc_poll, 3334 .ioctl = tipc_ioctl, 3335 .listen = sock_no_listen, 3336 .shutdown = tipc_shutdown, 3337 .setsockopt = tipc_setsockopt, 3338 .getsockopt = tipc_getsockopt, 3339 .sendmsg = tipc_sendmsg, 3340 .recvmsg = tipc_recvmsg, 3341 .mmap = sock_no_mmap, 3342 .sendpage = sock_no_sendpage 3343 }; 3344 3345 static const struct proto_ops packet_ops = { 3346 .owner = THIS_MODULE, 3347 .family = AF_TIPC, 3348 .release = tipc_release, 3349 .bind = tipc_bind, 3350 .connect = tipc_connect, 3351 .socketpair = tipc_socketpair, 3352 .accept = tipc_accept, 3353 .getname = tipc_getname, 3354 .poll = tipc_poll, 3355 .ioctl = tipc_ioctl, 3356 .listen = tipc_listen, 3357 .shutdown = tipc_shutdown, 3358 .setsockopt = tipc_setsockopt, 3359 .getsockopt = tipc_getsockopt, 3360 .sendmsg = tipc_send_packet, 3361 .recvmsg = tipc_recvmsg, 3362 .mmap = sock_no_mmap, 3363 .sendpage = sock_no_sendpage 3364 }; 3365 3366 static const struct proto_ops stream_ops = { 3367 .owner = THIS_MODULE, 3368 .family = AF_TIPC, 3369 .release = tipc_release, 3370 .bind = tipc_bind, 3371 .connect = tipc_connect, 3372 .socketpair = tipc_socketpair, 3373 .accept = tipc_accept, 3374 .getname = tipc_getname, 3375 .poll = tipc_poll, 3376 .ioctl = tipc_ioctl, 3377 .listen = tipc_listen, 3378 .shutdown = tipc_shutdown, 3379 .setsockopt = tipc_setsockopt, 3380 .getsockopt = tipc_getsockopt, 3381 .sendmsg = tipc_sendstream, 3382 .recvmsg = tipc_recvstream, 3383 .mmap = sock_no_mmap, 3384 .sendpage = sock_no_sendpage 3385 }; 3386 3387 static const struct net_proto_family tipc_family_ops = { 3388 .owner = THIS_MODULE, 3389 .family = AF_TIPC, 3390 .create = tipc_sk_create 3391 }; 3392 3393 static struct proto tipc_proto = { 3394 .name = "TIPC", 3395 .owner = THIS_MODULE, 3396 .obj_size = sizeof(struct tipc_sock), 3397 .sysctl_rmem = sysctl_tipc_rmem 3398 }; 3399 3400 /** 3401 * tipc_socket_init - initialize TIPC socket interface 3402 * 3403 * Returns 0 on success, errno otherwise 3404 */ 3405 int tipc_socket_init(void) 3406 { 3407 int res; 3408 3409 res = proto_register(&tipc_proto, 1); 3410 if (res) { 3411 pr_err("Failed to register TIPC protocol type\n"); 3412 goto out; 3413 } 3414 3415 res = sock_register(&tipc_family_ops); 3416 if (res) { 3417 pr_err("Failed to register TIPC socket type\n"); 3418 proto_unregister(&tipc_proto); 3419 goto out; 3420 } 3421 out: 3422 return res; 3423 } 3424 3425 /** 3426 * tipc_socket_stop - stop TIPC socket interface 3427 */ 3428 void tipc_socket_stop(void) 3429 { 3430 sock_unregister(tipc_family_ops.family); 3431 proto_unregister(&tipc_proto); 3432 } 3433 3434 /* Caller should hold socket lock for the passed tipc socket. */ 3435 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3436 { 3437 u32 peer_node; 3438 u32 peer_port; 3439 struct nlattr *nest; 3440 3441 peer_node = tsk_peer_node(tsk); 3442 peer_port = tsk_peer_port(tsk); 3443 3444 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3445 if (!nest) 3446 return -EMSGSIZE; 3447 3448 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3449 goto msg_full; 3450 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3451 goto msg_full; 3452 3453 if (tsk->conn_type != 0) { 3454 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3455 goto msg_full; 3456 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) 3457 goto msg_full; 3458 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) 3459 goto msg_full; 3460 } 3461 nla_nest_end(skb, nest); 3462 3463 return 0; 3464 3465 msg_full: 3466 nla_nest_cancel(skb, nest); 3467 3468 return -EMSGSIZE; 3469 } 3470 3471 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3472 *tsk) 3473 { 3474 struct net *net = sock_net(skb->sk); 3475 struct sock *sk = &tsk->sk; 3476 3477 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3478 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3479 return -EMSGSIZE; 3480 3481 if (tipc_sk_connected(sk)) { 3482 if (__tipc_nl_add_sk_con(skb, tsk)) 3483 return -EMSGSIZE; 3484 } else if (!list_empty(&tsk->publications)) { 3485 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3486 return -EMSGSIZE; 3487 } 3488 return 0; 3489 } 3490 3491 /* Caller should hold socket lock for the passed tipc socket. */ 3492 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3493 struct tipc_sock *tsk) 3494 { 3495 struct nlattr *attrs; 3496 void *hdr; 3497 3498 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3499 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3500 if (!hdr) 3501 goto msg_cancel; 3502 3503 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3504 if (!attrs) 3505 goto genlmsg_cancel; 3506 3507 if (__tipc_nl_add_sk_info(skb, tsk)) 3508 goto attr_msg_cancel; 3509 3510 nla_nest_end(skb, attrs); 3511 genlmsg_end(skb, hdr); 3512 3513 return 0; 3514 3515 attr_msg_cancel: 3516 nla_nest_cancel(skb, attrs); 3517 genlmsg_cancel: 3518 genlmsg_cancel(skb, hdr); 3519 msg_cancel: 3520 return -EMSGSIZE; 3521 } 3522 3523 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3524 int (*skb_handler)(struct sk_buff *skb, 3525 struct netlink_callback *cb, 3526 struct tipc_sock *tsk)) 3527 { 3528 struct rhashtable_iter *iter = (void *)cb->args[4]; 3529 struct tipc_sock *tsk; 3530 int err; 3531 3532 rhashtable_walk_start(iter); 3533 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3534 if (IS_ERR(tsk)) { 3535 err = PTR_ERR(tsk); 3536 if (err == -EAGAIN) { 3537 err = 0; 3538 continue; 3539 } 3540 break; 3541 } 3542 3543 sock_hold(&tsk->sk); 3544 rhashtable_walk_stop(iter); 3545 lock_sock(&tsk->sk); 3546 err = skb_handler(skb, cb, tsk); 3547 if (err) { 3548 release_sock(&tsk->sk); 3549 sock_put(&tsk->sk); 3550 goto out; 3551 } 3552 release_sock(&tsk->sk); 3553 rhashtable_walk_start(iter); 3554 sock_put(&tsk->sk); 3555 } 3556 rhashtable_walk_stop(iter); 3557 out: 3558 return skb->len; 3559 } 3560 EXPORT_SYMBOL(tipc_nl_sk_walk); 3561 3562 int tipc_dump_start(struct netlink_callback *cb) 3563 { 3564 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3565 } 3566 EXPORT_SYMBOL(tipc_dump_start); 3567 3568 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3569 { 3570 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3571 struct rhashtable_iter *iter = (void *)cb->args[4]; 3572 struct tipc_net *tn = tipc_net(net); 3573 3574 if (!iter) { 3575 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3576 if (!iter) 3577 return -ENOMEM; 3578 3579 cb->args[4] = (long)iter; 3580 } 3581 3582 rhashtable_walk_enter(&tn->sk_rht, iter); 3583 return 0; 3584 } 3585 3586 int tipc_dump_done(struct netlink_callback *cb) 3587 { 3588 struct rhashtable_iter *hti = (void *)cb->args[4]; 3589 3590 rhashtable_walk_exit(hti); 3591 kfree(hti); 3592 return 0; 3593 } 3594 EXPORT_SYMBOL(tipc_dump_done); 3595 3596 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3597 struct tipc_sock *tsk, u32 sk_filter_state, 3598 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3599 { 3600 struct sock *sk = &tsk->sk; 3601 struct nlattr *attrs; 3602 struct nlattr *stat; 3603 3604 /*filter response w.r.t sk_state*/ 3605 if (!(sk_filter_state & (1 << sk->sk_state))) 3606 return 0; 3607 3608 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3609 if (!attrs) 3610 goto msg_cancel; 3611 3612 if (__tipc_nl_add_sk_info(skb, tsk)) 3613 goto attr_msg_cancel; 3614 3615 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3616 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3617 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3618 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3619 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3620 sock_i_uid(sk))) || 3621 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3622 tipc_diag_gen_cookie(sk), 3623 TIPC_NLA_SOCK_PAD)) 3624 goto attr_msg_cancel; 3625 3626 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3627 if (!stat) 3628 goto attr_msg_cancel; 3629 3630 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3631 skb_queue_len(&sk->sk_receive_queue)) || 3632 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3633 skb_queue_len(&sk->sk_write_queue)) || 3634 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3635 atomic_read(&sk->sk_drops))) 3636 goto stat_msg_cancel; 3637 3638 if (tsk->cong_link_cnt && 3639 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3640 goto stat_msg_cancel; 3641 3642 if (tsk_conn_cong(tsk) && 3643 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3644 goto stat_msg_cancel; 3645 3646 nla_nest_end(skb, stat); 3647 3648 if (tsk->group) 3649 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3650 goto stat_msg_cancel; 3651 3652 nla_nest_end(skb, attrs); 3653 3654 return 0; 3655 3656 stat_msg_cancel: 3657 nla_nest_cancel(skb, stat); 3658 attr_msg_cancel: 3659 nla_nest_cancel(skb, attrs); 3660 msg_cancel: 3661 return -EMSGSIZE; 3662 } 3663 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3664 3665 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3666 { 3667 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3668 } 3669 3670 /* Caller should hold socket lock for the passed tipc socket. */ 3671 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3672 struct netlink_callback *cb, 3673 struct publication *publ) 3674 { 3675 void *hdr; 3676 struct nlattr *attrs; 3677 3678 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3679 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3680 if (!hdr) 3681 goto msg_cancel; 3682 3683 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3684 if (!attrs) 3685 goto genlmsg_cancel; 3686 3687 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3688 goto attr_msg_cancel; 3689 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) 3690 goto attr_msg_cancel; 3691 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) 3692 goto attr_msg_cancel; 3693 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) 3694 goto attr_msg_cancel; 3695 3696 nla_nest_end(skb, attrs); 3697 genlmsg_end(skb, hdr); 3698 3699 return 0; 3700 3701 attr_msg_cancel: 3702 nla_nest_cancel(skb, attrs); 3703 genlmsg_cancel: 3704 genlmsg_cancel(skb, hdr); 3705 msg_cancel: 3706 return -EMSGSIZE; 3707 } 3708 3709 /* Caller should hold socket lock for the passed tipc socket. */ 3710 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3711 struct netlink_callback *cb, 3712 struct tipc_sock *tsk, u32 *last_publ) 3713 { 3714 int err; 3715 struct publication *p; 3716 3717 if (*last_publ) { 3718 list_for_each_entry(p, &tsk->publications, binding_sock) { 3719 if (p->key == *last_publ) 3720 break; 3721 } 3722 if (p->key != *last_publ) { 3723 /* We never set seq or call nl_dump_check_consistent() 3724 * this means that setting prev_seq here will cause the 3725 * consistence check to fail in the netlink callback 3726 * handler. Resulting in the last NLMSG_DONE message 3727 * having the NLM_F_DUMP_INTR flag set. 3728 */ 3729 cb->prev_seq = 1; 3730 *last_publ = 0; 3731 return -EPIPE; 3732 } 3733 } else { 3734 p = list_first_entry(&tsk->publications, struct publication, 3735 binding_sock); 3736 } 3737 3738 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3739 err = __tipc_nl_add_sk_publ(skb, cb, p); 3740 if (err) { 3741 *last_publ = p->key; 3742 return err; 3743 } 3744 } 3745 *last_publ = 0; 3746 3747 return 0; 3748 } 3749 3750 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3751 { 3752 int err; 3753 u32 tsk_portid = cb->args[0]; 3754 u32 last_publ = cb->args[1]; 3755 u32 done = cb->args[2]; 3756 struct net *net = sock_net(skb->sk); 3757 struct tipc_sock *tsk; 3758 3759 if (!tsk_portid) { 3760 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3761 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3762 3763 if (!attrs[TIPC_NLA_SOCK]) 3764 return -EINVAL; 3765 3766 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3767 attrs[TIPC_NLA_SOCK], 3768 tipc_nl_sock_policy, NULL); 3769 if (err) 3770 return err; 3771 3772 if (!sock[TIPC_NLA_SOCK_REF]) 3773 return -EINVAL; 3774 3775 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3776 } 3777 3778 if (done) 3779 return 0; 3780 3781 tsk = tipc_sk_lookup(net, tsk_portid); 3782 if (!tsk) 3783 return -EINVAL; 3784 3785 lock_sock(&tsk->sk); 3786 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3787 if (!err) 3788 done = 1; 3789 release_sock(&tsk->sk); 3790 sock_put(&tsk->sk); 3791 3792 cb->args[0] = tsk_portid; 3793 cb->args[1] = last_publ; 3794 cb->args[2] = done; 3795 3796 return skb->len; 3797 } 3798 3799 /** 3800 * tipc_sk_filtering - check if a socket should be traced 3801 * @sk: the socket to be examined 3802 * @sysctl_tipc_sk_filter[]: the socket tuple for filtering, 3803 * (portid, sock type, name type, name lower, name upper) 3804 * 3805 * Returns true if the socket meets the socket tuple data 3806 * (value 0 = 'any') or when there is no tuple set (all = 0), 3807 * otherwise false 3808 */ 3809 bool tipc_sk_filtering(struct sock *sk) 3810 { 3811 struct tipc_sock *tsk; 3812 struct publication *p; 3813 u32 _port, _sktype, _type, _lower, _upper; 3814 u32 type = 0, lower = 0, upper = 0; 3815 3816 if (!sk) 3817 return true; 3818 3819 tsk = tipc_sk(sk); 3820 3821 _port = sysctl_tipc_sk_filter[0]; 3822 _sktype = sysctl_tipc_sk_filter[1]; 3823 _type = sysctl_tipc_sk_filter[2]; 3824 _lower = sysctl_tipc_sk_filter[3]; 3825 _upper = sysctl_tipc_sk_filter[4]; 3826 3827 if (!_port && !_sktype && !_type && !_lower && !_upper) 3828 return true; 3829 3830 if (_port) 3831 return (_port == tsk->portid); 3832 3833 if (_sktype && _sktype != sk->sk_type) 3834 return false; 3835 3836 if (tsk->published) { 3837 p = list_first_entry_or_null(&tsk->publications, 3838 struct publication, binding_sock); 3839 if (p) { 3840 type = p->type; 3841 lower = p->lower; 3842 upper = p->upper; 3843 } 3844 } 3845 3846 if (!tipc_sk_type_connectionless(sk)) { 3847 type = tsk->conn_type; 3848 lower = tsk->conn_instance; 3849 upper = tsk->conn_instance; 3850 } 3851 3852 if ((_type && _type != type) || (_lower && _lower != lower) || 3853 (_upper && _upper != upper)) 3854 return false; 3855 3856 return true; 3857 } 3858 3859 u32 tipc_sock_get_portid(struct sock *sk) 3860 { 3861 return (sk) ? (tipc_sk(sk))->portid : 0; 3862 } 3863 3864 /** 3865 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3866 * both the rcv and backlog queues are considered 3867 * @sk: tipc sk to be checked 3868 * @skb: tipc msg to be checked 3869 * 3870 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3871 */ 3872 3873 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3874 { 3875 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3876 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3877 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3878 3879 return (qsize > lim * 90 / 100); 3880 } 3881 3882 /** 3883 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3884 * only the rcv queue is considered 3885 * @sk: tipc sk to be checked 3886 * @skb: tipc msg to be checked 3887 * 3888 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3889 */ 3890 3891 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3892 { 3893 unsigned int lim = rcvbuf_limit(sk, skb); 3894 unsigned int qsize = sk_rmem_alloc_get(sk); 3895 3896 return (qsize > lim * 90 / 100); 3897 } 3898 3899 /** 3900 * tipc_sk_dump - dump TIPC socket 3901 * @sk: tipc sk to be dumped 3902 * @dqueues: bitmask to decide if any socket queue to be dumped? 3903 * - TIPC_DUMP_NONE: don't dump socket queues 3904 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3905 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3906 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3907 * - TIPC_DUMP_ALL: dump all the socket queues above 3908 * @buf: returned buffer of dump data in format 3909 */ 3910 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3911 { 3912 int i = 0; 3913 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3914 struct tipc_sock *tsk; 3915 struct publication *p; 3916 bool tsk_connected; 3917 3918 if (!sk) { 3919 i += scnprintf(buf, sz, "sk data: (null)\n"); 3920 return i; 3921 } 3922 3923 tsk = tipc_sk(sk); 3924 tsk_connected = !tipc_sk_type_connectionless(sk); 3925 3926 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3927 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3928 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3929 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3930 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3931 if (tsk_connected) { 3932 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3933 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3934 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type); 3935 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance); 3936 } 3937 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3938 if (tsk->published) { 3939 p = list_first_entry_or_null(&tsk->publications, 3940 struct publication, binding_sock); 3941 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0); 3942 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0); 3943 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0); 3944 } 3945 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3946 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3947 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3948 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3949 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3950 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3951 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3952 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3953 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3954 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3955 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3956 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3957 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3958 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3959 3960 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3961 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3962 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3963 } 3964 3965 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3966 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3967 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3968 } 3969 3970 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 3971 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 3972 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 3973 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 3974 i += scnprintf(buf + i, sz - i, " tail "); 3975 i += tipc_skb_dump(sk->sk_backlog.tail, false, 3976 buf + i); 3977 } 3978 } 3979 3980 return i; 3981 } 3982