1 /* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2007, 2012-2017, Ericsson AB 5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <linux/rhashtable.h> 38 #include <linux/sched/signal.h> 39 40 #include "core.h" 41 #include "name_table.h" 42 #include "node.h" 43 #include "link.h" 44 #include "name_distr.h" 45 #include "socket.h" 46 #include "bcast.h" 47 #include "netlink.h" 48 #include "group.h" 49 #include "trace.h" 50 51 #define NAGLE_START_INIT 4 52 #define NAGLE_START_MAX 1024 53 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 54 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 55 #define TIPC_MAX_PORT 0xffffffff 56 #define TIPC_MIN_PORT 1 57 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */ 58 59 enum { 60 TIPC_LISTEN = TCP_LISTEN, 61 TIPC_ESTABLISHED = TCP_ESTABLISHED, 62 TIPC_OPEN = TCP_CLOSE, 63 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 64 TIPC_CONNECTING = TCP_SYN_SENT, 65 }; 66 67 struct sockaddr_pair { 68 struct sockaddr_tipc sock; 69 struct sockaddr_tipc member; 70 }; 71 72 /** 73 * struct tipc_sock - TIPC socket structure 74 * @sk: socket - interacts with 'port' and with user via the socket API 75 * @conn_type: TIPC type used when connection was established 76 * @conn_instance: TIPC instance used when connection was established 77 * @published: non-zero if port has one or more associated names 78 * @max_pkt: maximum packet size "hint" used when building messages sent by port 79 * @maxnagle: maximum size of msg which can be subject to nagle 80 * @portid: unique port identity in TIPC socket hash table 81 * @phdr: preformatted message header used when sending messages 82 * #cong_links: list of congested links 83 * @publications: list of publications for port 84 * @blocking_link: address of the congested link we are currently sleeping on 85 * @pub_count: total # of publications port has made during its lifetime 86 * @conn_timeout: the time we can wait for an unresponded setup request 87 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 88 * @cong_link_cnt: number of congested links 89 * @snt_unacked: # messages sent by socket, and not yet acked by peer 90 * @rcv_unacked: # messages read by user, but not yet acked back to peer 91 * @peer: 'connected' peer for dgram/rdm 92 * @node: hash table node 93 * @mc_method: cookie for use between socket and broadcast layer 94 * @rcu: rcu struct for tipc_sock 95 */ 96 struct tipc_sock { 97 struct sock sk; 98 u32 conn_type; 99 u32 conn_instance; 100 int published; 101 u32 max_pkt; 102 u32 maxnagle; 103 u32 portid; 104 struct tipc_msg phdr; 105 struct list_head cong_links; 106 struct list_head publications; 107 u32 pub_count; 108 atomic_t dupl_rcvcnt; 109 u16 conn_timeout; 110 bool probe_unacked; 111 u16 cong_link_cnt; 112 u16 snt_unacked; 113 u16 snd_win; 114 u16 peer_caps; 115 u16 rcv_unacked; 116 u16 rcv_win; 117 struct sockaddr_tipc peer; 118 struct rhash_head node; 119 struct tipc_mc_method mc_method; 120 struct rcu_head rcu; 121 struct tipc_group *group; 122 u32 oneway; 123 u32 nagle_start; 124 u16 snd_backlog; 125 u16 msg_acc; 126 u16 pkt_cnt; 127 bool expect_ack; 128 bool nodelay; 129 bool group_is_open; 130 }; 131 132 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 133 static void tipc_data_ready(struct sock *sk); 134 static void tipc_write_space(struct sock *sk); 135 static void tipc_sock_destruct(struct sock *sk); 136 static int tipc_release(struct socket *sock); 137 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 138 bool kern); 139 static void tipc_sk_timeout(struct timer_list *t); 140 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 141 struct tipc_name_seq const *seq); 142 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 143 struct tipc_name_seq const *seq); 144 static int tipc_sk_leave(struct tipc_sock *tsk); 145 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 146 static int tipc_sk_insert(struct tipc_sock *tsk); 147 static void tipc_sk_remove(struct tipc_sock *tsk); 148 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 149 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 150 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 151 152 static const struct proto_ops packet_ops; 153 static const struct proto_ops stream_ops; 154 static const struct proto_ops msg_ops; 155 static struct proto tipc_proto; 156 static const struct rhashtable_params tsk_rht_params; 157 158 static u32 tsk_own_node(struct tipc_sock *tsk) 159 { 160 return msg_prevnode(&tsk->phdr); 161 } 162 163 static u32 tsk_peer_node(struct tipc_sock *tsk) 164 { 165 return msg_destnode(&tsk->phdr); 166 } 167 168 static u32 tsk_peer_port(struct tipc_sock *tsk) 169 { 170 return msg_destport(&tsk->phdr); 171 } 172 173 static bool tsk_unreliable(struct tipc_sock *tsk) 174 { 175 return msg_src_droppable(&tsk->phdr) != 0; 176 } 177 178 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 179 { 180 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 181 } 182 183 static bool tsk_unreturnable(struct tipc_sock *tsk) 184 { 185 return msg_dest_droppable(&tsk->phdr) != 0; 186 } 187 188 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 189 { 190 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 191 } 192 193 static int tsk_importance(struct tipc_sock *tsk) 194 { 195 return msg_importance(&tsk->phdr); 196 } 197 198 static struct tipc_sock *tipc_sk(const struct sock *sk) 199 { 200 return container_of(sk, struct tipc_sock, sk); 201 } 202 203 int tsk_set_importance(struct sock *sk, int imp) 204 { 205 if (imp > TIPC_CRITICAL_IMPORTANCE) 206 return -EINVAL; 207 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 208 return 0; 209 } 210 211 static bool tsk_conn_cong(struct tipc_sock *tsk) 212 { 213 return tsk->snt_unacked > tsk->snd_win; 214 } 215 216 static u16 tsk_blocks(int len) 217 { 218 return ((len / FLOWCTL_BLK_SZ) + 1); 219 } 220 221 /* tsk_blocks(): translate a buffer size in bytes to number of 222 * advertisable blocks, taking into account the ratio truesize(len)/len 223 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 224 */ 225 static u16 tsk_adv_blocks(int len) 226 { 227 return len / FLOWCTL_BLK_SZ / 4; 228 } 229 230 /* tsk_inc(): increment counter for sent or received data 231 * - If block based flow control is not supported by peer we 232 * fall back to message based ditto, incrementing the counter 233 */ 234 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 235 { 236 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 237 return ((msglen / FLOWCTL_BLK_SZ) + 1); 238 return 1; 239 } 240 241 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 242 */ 243 static void tsk_set_nagle(struct tipc_sock *tsk) 244 { 245 struct sock *sk = &tsk->sk; 246 247 tsk->maxnagle = 0; 248 if (sk->sk_type != SOCK_STREAM) 249 return; 250 if (tsk->nodelay) 251 return; 252 if (!(tsk->peer_caps & TIPC_NAGLE)) 253 return; 254 /* Limit node local buffer size to avoid receive queue overflow */ 255 if (tsk->max_pkt == MAX_MSG_SIZE) 256 tsk->maxnagle = 1500; 257 else 258 tsk->maxnagle = tsk->max_pkt; 259 } 260 261 /** 262 * tsk_advance_rx_queue - discard first buffer in socket receive queue 263 * 264 * Caller must hold socket lock 265 */ 266 static void tsk_advance_rx_queue(struct sock *sk) 267 { 268 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 269 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 270 } 271 272 /* tipc_sk_respond() : send response message back to sender 273 */ 274 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 275 { 276 u32 selector; 277 u32 dnode; 278 u32 onode = tipc_own_addr(sock_net(sk)); 279 280 if (!tipc_msg_reverse(onode, &skb, err)) 281 return; 282 283 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 284 dnode = msg_destnode(buf_msg(skb)); 285 selector = msg_origport(buf_msg(skb)); 286 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 287 } 288 289 /** 290 * tsk_rej_rx_queue - reject all buffers in socket receive queue 291 * 292 * Caller must hold socket lock 293 */ 294 static void tsk_rej_rx_queue(struct sock *sk, int error) 295 { 296 struct sk_buff *skb; 297 298 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 299 tipc_sk_respond(sk, skb, error); 300 } 301 302 static bool tipc_sk_connected(struct sock *sk) 303 { 304 return sk->sk_state == TIPC_ESTABLISHED; 305 } 306 307 /* tipc_sk_type_connectionless - check if the socket is datagram socket 308 * @sk: socket 309 * 310 * Returns true if connection less, false otherwise 311 */ 312 static bool tipc_sk_type_connectionless(struct sock *sk) 313 { 314 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 315 } 316 317 /* tsk_peer_msg - verify if message was sent by connected port's peer 318 * 319 * Handles cases where the node's network address has changed from 320 * the default of <0.0.0> to its configured setting. 321 */ 322 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 323 { 324 struct sock *sk = &tsk->sk; 325 u32 self = tipc_own_addr(sock_net(sk)); 326 u32 peer_port = tsk_peer_port(tsk); 327 u32 orig_node, peer_node; 328 329 if (unlikely(!tipc_sk_connected(sk))) 330 return false; 331 332 if (unlikely(msg_origport(msg) != peer_port)) 333 return false; 334 335 orig_node = msg_orignode(msg); 336 peer_node = tsk_peer_node(tsk); 337 338 if (likely(orig_node == peer_node)) 339 return true; 340 341 if (!orig_node && peer_node == self) 342 return true; 343 344 if (!peer_node && orig_node == self) 345 return true; 346 347 return false; 348 } 349 350 /* tipc_set_sk_state - set the sk_state of the socket 351 * @sk: socket 352 * 353 * Caller must hold socket lock 354 * 355 * Returns 0 on success, errno otherwise 356 */ 357 static int tipc_set_sk_state(struct sock *sk, int state) 358 { 359 int oldsk_state = sk->sk_state; 360 int res = -EINVAL; 361 362 switch (state) { 363 case TIPC_OPEN: 364 res = 0; 365 break; 366 case TIPC_LISTEN: 367 case TIPC_CONNECTING: 368 if (oldsk_state == TIPC_OPEN) 369 res = 0; 370 break; 371 case TIPC_ESTABLISHED: 372 if (oldsk_state == TIPC_CONNECTING || 373 oldsk_state == TIPC_OPEN) 374 res = 0; 375 break; 376 case TIPC_DISCONNECTING: 377 if (oldsk_state == TIPC_CONNECTING || 378 oldsk_state == TIPC_ESTABLISHED) 379 res = 0; 380 break; 381 } 382 383 if (!res) 384 sk->sk_state = state; 385 386 return res; 387 } 388 389 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 390 { 391 struct sock *sk = sock->sk; 392 int err = sock_error(sk); 393 int typ = sock->type; 394 395 if (err) 396 return err; 397 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 398 if (sk->sk_state == TIPC_DISCONNECTING) 399 return -EPIPE; 400 else if (!tipc_sk_connected(sk)) 401 return -ENOTCONN; 402 } 403 if (!*timeout) 404 return -EAGAIN; 405 if (signal_pending(current)) 406 return sock_intr_errno(*timeout); 407 408 return 0; 409 } 410 411 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 412 ({ \ 413 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 414 struct sock *sk_; \ 415 int rc_; \ 416 \ 417 while ((rc_ = !(condition_))) { \ 418 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 419 smp_rmb(); \ 420 sk_ = (sock_)->sk; \ 421 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 422 if (rc_) \ 423 break; \ 424 add_wait_queue(sk_sleep(sk_), &wait_); \ 425 release_sock(sk_); \ 426 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 427 sched_annotate_sleep(); \ 428 lock_sock(sk_); \ 429 remove_wait_queue(sk_sleep(sk_), &wait_); \ 430 } \ 431 rc_; \ 432 }) 433 434 /** 435 * tipc_sk_create - create a TIPC socket 436 * @net: network namespace (must be default network) 437 * @sock: pre-allocated socket structure 438 * @protocol: protocol indicator (must be 0) 439 * @kern: caused by kernel or by userspace? 440 * 441 * This routine creates additional data structures used by the TIPC socket, 442 * initializes them, and links them together. 443 * 444 * Returns 0 on success, errno otherwise 445 */ 446 static int tipc_sk_create(struct net *net, struct socket *sock, 447 int protocol, int kern) 448 { 449 const struct proto_ops *ops; 450 struct sock *sk; 451 struct tipc_sock *tsk; 452 struct tipc_msg *msg; 453 454 /* Validate arguments */ 455 if (unlikely(protocol != 0)) 456 return -EPROTONOSUPPORT; 457 458 switch (sock->type) { 459 case SOCK_STREAM: 460 ops = &stream_ops; 461 break; 462 case SOCK_SEQPACKET: 463 ops = &packet_ops; 464 break; 465 case SOCK_DGRAM: 466 case SOCK_RDM: 467 ops = &msg_ops; 468 break; 469 default: 470 return -EPROTOTYPE; 471 } 472 473 /* Allocate socket's protocol area */ 474 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 475 if (sk == NULL) 476 return -ENOMEM; 477 478 tsk = tipc_sk(sk); 479 tsk->max_pkt = MAX_PKT_DEFAULT; 480 tsk->maxnagle = 0; 481 tsk->nagle_start = NAGLE_START_INIT; 482 INIT_LIST_HEAD(&tsk->publications); 483 INIT_LIST_HEAD(&tsk->cong_links); 484 msg = &tsk->phdr; 485 486 /* Finish initializing socket data structures */ 487 sock->ops = ops; 488 sock_init_data(sock, sk); 489 tipc_set_sk_state(sk, TIPC_OPEN); 490 if (tipc_sk_insert(tsk)) { 491 pr_warn("Socket create failed; port number exhausted\n"); 492 return -EINVAL; 493 } 494 495 /* Ensure tsk is visible before we read own_addr. */ 496 smp_mb(); 497 498 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 499 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 500 501 msg_set_origport(msg, tsk->portid); 502 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 503 sk->sk_shutdown = 0; 504 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 505 sk->sk_rcvbuf = sysctl_tipc_rmem[1]; 506 sk->sk_data_ready = tipc_data_ready; 507 sk->sk_write_space = tipc_write_space; 508 sk->sk_destruct = tipc_sock_destruct; 509 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 510 tsk->group_is_open = true; 511 atomic_set(&tsk->dupl_rcvcnt, 0); 512 513 /* Start out with safe limits until we receive an advertised window */ 514 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 515 tsk->rcv_win = tsk->snd_win; 516 517 if (tipc_sk_type_connectionless(sk)) { 518 tsk_set_unreturnable(tsk, true); 519 if (sock->type == SOCK_DGRAM) 520 tsk_set_unreliable(tsk, true); 521 } 522 __skb_queue_head_init(&tsk->mc_method.deferredq); 523 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 524 return 0; 525 } 526 527 static void tipc_sk_callback(struct rcu_head *head) 528 { 529 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 530 531 sock_put(&tsk->sk); 532 } 533 534 /* Caller should hold socket lock for the socket. */ 535 static void __tipc_shutdown(struct socket *sock, int error) 536 { 537 struct sock *sk = sock->sk; 538 struct tipc_sock *tsk = tipc_sk(sk); 539 struct net *net = sock_net(sk); 540 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 541 u32 dnode = tsk_peer_node(tsk); 542 struct sk_buff *skb; 543 544 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 545 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 546 !tsk_conn_cong(tsk))); 547 548 /* Push out delayed messages if in Nagle mode */ 549 tipc_sk_push_backlog(tsk, false); 550 /* Remove pending SYN */ 551 __skb_queue_purge(&sk->sk_write_queue); 552 553 /* Remove partially received buffer if any */ 554 skb = skb_peek(&sk->sk_receive_queue); 555 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 556 __skb_unlink(skb, &sk->sk_receive_queue); 557 kfree_skb(skb); 558 } 559 560 /* Reject all unreceived messages if connectionless */ 561 if (tipc_sk_type_connectionless(sk)) { 562 tsk_rej_rx_queue(sk, error); 563 return; 564 } 565 566 switch (sk->sk_state) { 567 case TIPC_CONNECTING: 568 case TIPC_ESTABLISHED: 569 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 570 tipc_node_remove_conn(net, dnode, tsk->portid); 571 /* Send a FIN+/- to its peer */ 572 skb = __skb_dequeue(&sk->sk_receive_queue); 573 if (skb) { 574 __skb_queue_purge(&sk->sk_receive_queue); 575 tipc_sk_respond(sk, skb, error); 576 break; 577 } 578 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 579 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 580 tsk_own_node(tsk), tsk_peer_port(tsk), 581 tsk->portid, error); 582 if (skb) 583 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 584 break; 585 case TIPC_LISTEN: 586 /* Reject all SYN messages */ 587 tsk_rej_rx_queue(sk, error); 588 break; 589 default: 590 __skb_queue_purge(&sk->sk_receive_queue); 591 break; 592 } 593 } 594 595 /** 596 * tipc_release - destroy a TIPC socket 597 * @sock: socket to destroy 598 * 599 * This routine cleans up any messages that are still queued on the socket. 600 * For DGRAM and RDM socket types, all queued messages are rejected. 601 * For SEQPACKET and STREAM socket types, the first message is rejected 602 * and any others are discarded. (If the first message on a STREAM socket 603 * is partially-read, it is discarded and the next one is rejected instead.) 604 * 605 * NOTE: Rejected messages are not necessarily returned to the sender! They 606 * are returned or discarded according to the "destination droppable" setting 607 * specified for the message by the sender. 608 * 609 * Returns 0 on success, errno otherwise 610 */ 611 static int tipc_release(struct socket *sock) 612 { 613 struct sock *sk = sock->sk; 614 struct tipc_sock *tsk; 615 616 /* 617 * Exit if socket isn't fully initialized (occurs when a failed accept() 618 * releases a pre-allocated child socket that was never used) 619 */ 620 if (sk == NULL) 621 return 0; 622 623 tsk = tipc_sk(sk); 624 lock_sock(sk); 625 626 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 627 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 628 sk->sk_shutdown = SHUTDOWN_MASK; 629 tipc_sk_leave(tsk); 630 tipc_sk_withdraw(tsk, 0, NULL); 631 __skb_queue_purge(&tsk->mc_method.deferredq); 632 sk_stop_timer(sk, &sk->sk_timer); 633 tipc_sk_remove(tsk); 634 635 sock_orphan(sk); 636 /* Reject any messages that accumulated in backlog queue */ 637 release_sock(sk); 638 tipc_dest_list_purge(&tsk->cong_links); 639 tsk->cong_link_cnt = 0; 640 call_rcu(&tsk->rcu, tipc_sk_callback); 641 sock->sk = NULL; 642 643 return 0; 644 } 645 646 /** 647 * tipc_bind - associate or disassocate TIPC name(s) with a socket 648 * @sock: socket structure 649 * @uaddr: socket address describing name(s) and desired operation 650 * @uaddr_len: size of socket address data structure 651 * 652 * Name and name sequence binding is indicated using a positive scope value; 653 * a negative scope value unbinds the specified name. Specifying no name 654 * (i.e. a socket address length of 0) unbinds all names from the socket. 655 * 656 * Returns 0 on success, errno otherwise 657 * 658 * NOTE: This routine doesn't need to take the socket lock since it doesn't 659 * access any non-constant socket information. 660 */ 661 662 int tipc_sk_bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) 663 { 664 struct sock *sk = sock->sk; 665 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 666 struct tipc_sock *tsk = tipc_sk(sk); 667 int res = -EINVAL; 668 669 lock_sock(sk); 670 if (unlikely(!uaddr_len)) { 671 res = tipc_sk_withdraw(tsk, 0, NULL); 672 goto exit; 673 } 674 if (tsk->group) { 675 res = -EACCES; 676 goto exit; 677 } 678 if (uaddr_len < sizeof(struct sockaddr_tipc)) { 679 res = -EINVAL; 680 goto exit; 681 } 682 if (addr->family != AF_TIPC) { 683 res = -EAFNOSUPPORT; 684 goto exit; 685 } 686 687 if (addr->addrtype == TIPC_ADDR_NAME) 688 addr->addr.nameseq.upper = addr->addr.nameseq.lower; 689 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { 690 res = -EAFNOSUPPORT; 691 goto exit; 692 } 693 694 res = (addr->scope >= 0) ? 695 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) : 696 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq); 697 exit: 698 release_sock(sk); 699 return res; 700 } 701 702 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 703 { 704 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)skaddr; 705 706 if (alen) { 707 if (alen < sizeof(struct sockaddr_tipc)) 708 return -EINVAL; 709 if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES) { 710 pr_warn_once("Can't bind to reserved service type %u\n", 711 addr->addr.nameseq.type); 712 return -EACCES; 713 } 714 } 715 return tipc_sk_bind(sock, skaddr, alen); 716 } 717 718 /** 719 * tipc_getname - get port ID of socket or peer socket 720 * @sock: socket structure 721 * @uaddr: area for returned socket address 722 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 723 * 724 * Returns 0 on success, errno otherwise 725 * 726 * NOTE: This routine doesn't need to take the socket lock since it only 727 * accesses socket information that is unchanging (or which changes in 728 * a completely predictable manner). 729 */ 730 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 731 int peer) 732 { 733 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 734 struct sock *sk = sock->sk; 735 struct tipc_sock *tsk = tipc_sk(sk); 736 737 memset(addr, 0, sizeof(*addr)); 738 if (peer) { 739 if ((!tipc_sk_connected(sk)) && 740 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 741 return -ENOTCONN; 742 addr->addr.id.ref = tsk_peer_port(tsk); 743 addr->addr.id.node = tsk_peer_node(tsk); 744 } else { 745 addr->addr.id.ref = tsk->portid; 746 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 747 } 748 749 addr->addrtype = TIPC_ADDR_ID; 750 addr->family = AF_TIPC; 751 addr->scope = 0; 752 addr->addr.name.domain = 0; 753 754 return sizeof(*addr); 755 } 756 757 /** 758 * tipc_poll - read and possibly block on pollmask 759 * @file: file structure associated with the socket 760 * @sock: socket for which to calculate the poll bits 761 * @wait: ??? 762 * 763 * Returns pollmask value 764 * 765 * COMMENTARY: 766 * It appears that the usual socket locking mechanisms are not useful here 767 * since the pollmask info is potentially out-of-date the moment this routine 768 * exits. TCP and other protocols seem to rely on higher level poll routines 769 * to handle any preventable race conditions, so TIPC will do the same ... 770 * 771 * IMPORTANT: The fact that a read or write operation is indicated does NOT 772 * imply that the operation will succeed, merely that it should be performed 773 * and will not block. 774 */ 775 static __poll_t tipc_poll(struct file *file, struct socket *sock, 776 poll_table *wait) 777 { 778 struct sock *sk = sock->sk; 779 struct tipc_sock *tsk = tipc_sk(sk); 780 __poll_t revents = 0; 781 782 sock_poll_wait(file, sock, wait); 783 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 784 785 if (sk->sk_shutdown & RCV_SHUTDOWN) 786 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 787 if (sk->sk_shutdown == SHUTDOWN_MASK) 788 revents |= EPOLLHUP; 789 790 switch (sk->sk_state) { 791 case TIPC_ESTABLISHED: 792 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 793 revents |= EPOLLOUT; 794 fallthrough; 795 case TIPC_LISTEN: 796 case TIPC_CONNECTING: 797 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 798 revents |= EPOLLIN | EPOLLRDNORM; 799 break; 800 case TIPC_OPEN: 801 if (tsk->group_is_open && !tsk->cong_link_cnt) 802 revents |= EPOLLOUT; 803 if (!tipc_sk_type_connectionless(sk)) 804 break; 805 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 806 break; 807 revents |= EPOLLIN | EPOLLRDNORM; 808 break; 809 case TIPC_DISCONNECTING: 810 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 811 break; 812 } 813 return revents; 814 } 815 816 /** 817 * tipc_sendmcast - send multicast message 818 * @sock: socket structure 819 * @seq: destination address 820 * @msg: message to send 821 * @dlen: length of data to send 822 * @timeout: timeout to wait for wakeup 823 * 824 * Called from function tipc_sendmsg(), which has done all sanity checks 825 * Returns the number of bytes sent on success, or errno 826 */ 827 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, 828 struct msghdr *msg, size_t dlen, long timeout) 829 { 830 struct sock *sk = sock->sk; 831 struct tipc_sock *tsk = tipc_sk(sk); 832 struct tipc_msg *hdr = &tsk->phdr; 833 struct net *net = sock_net(sk); 834 int mtu = tipc_bcast_get_mtu(net); 835 struct tipc_mc_method *method = &tsk->mc_method; 836 struct sk_buff_head pkts; 837 struct tipc_nlist dsts; 838 int rc; 839 840 if (tsk->group) 841 return -EACCES; 842 843 /* Block or return if any destination link is congested */ 844 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 845 if (unlikely(rc)) 846 return rc; 847 848 /* Lookup destination nodes */ 849 tipc_nlist_init(&dsts, tipc_own_addr(net)); 850 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower, 851 seq->upper, &dsts); 852 if (!dsts.local && !dsts.remote) 853 return -EHOSTUNREACH; 854 855 /* Build message header */ 856 msg_set_type(hdr, TIPC_MCAST_MSG); 857 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 858 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 859 msg_set_destport(hdr, 0); 860 msg_set_destnode(hdr, 0); 861 msg_set_nametype(hdr, seq->type); 862 msg_set_namelower(hdr, seq->lower); 863 msg_set_nameupper(hdr, seq->upper); 864 865 /* Build message as chain of buffers */ 866 __skb_queue_head_init(&pkts); 867 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 868 869 /* Send message if build was successful */ 870 if (unlikely(rc == dlen)) { 871 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 872 TIPC_DUMP_SK_SNDQ, " "); 873 rc = tipc_mcast_xmit(net, &pkts, method, &dsts, 874 &tsk->cong_link_cnt); 875 } 876 877 tipc_nlist_purge(&dsts); 878 879 return rc ? rc : dlen; 880 } 881 882 /** 883 * tipc_send_group_msg - send a message to a member in the group 884 * @net: network namespace 885 * @m: message to send 886 * @mb: group member 887 * @dnode: destination node 888 * @dport: destination port 889 * @dlen: total length of message data 890 */ 891 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 892 struct msghdr *m, struct tipc_member *mb, 893 u32 dnode, u32 dport, int dlen) 894 { 895 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 896 struct tipc_mc_method *method = &tsk->mc_method; 897 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 898 struct tipc_msg *hdr = &tsk->phdr; 899 struct sk_buff_head pkts; 900 int mtu, rc; 901 902 /* Complete message header */ 903 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 904 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 905 msg_set_destport(hdr, dport); 906 msg_set_destnode(hdr, dnode); 907 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 908 909 /* Build message as chain of buffers */ 910 __skb_queue_head_init(&pkts); 911 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 912 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 913 if (unlikely(rc != dlen)) 914 return rc; 915 916 /* Send message */ 917 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 918 if (unlikely(rc == -ELINKCONG)) { 919 tipc_dest_push(&tsk->cong_links, dnode, 0); 920 tsk->cong_link_cnt++; 921 } 922 923 /* Update send window */ 924 tipc_group_update_member(mb, blks); 925 926 /* A broadcast sent within next EXPIRE period must follow same path */ 927 method->rcast = true; 928 method->mandatory = true; 929 return dlen; 930 } 931 932 /** 933 * tipc_send_group_unicast - send message to a member in the group 934 * @sock: socket structure 935 * @m: message to send 936 * @dlen: total length of message data 937 * @timeout: timeout to wait for wakeup 938 * 939 * Called from function tipc_sendmsg(), which has done all sanity checks 940 * Returns the number of bytes sent on success, or errno 941 */ 942 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 943 int dlen, long timeout) 944 { 945 struct sock *sk = sock->sk; 946 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 947 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 948 struct tipc_sock *tsk = tipc_sk(sk); 949 struct net *net = sock_net(sk); 950 struct tipc_member *mb = NULL; 951 u32 node, port; 952 int rc; 953 954 node = dest->addr.id.node; 955 port = dest->addr.id.ref; 956 if (!port && !node) 957 return -EHOSTUNREACH; 958 959 /* Block or return if destination link or member is congested */ 960 rc = tipc_wait_for_cond(sock, &timeout, 961 !tipc_dest_find(&tsk->cong_links, node, 0) && 962 tsk->group && 963 !tipc_group_cong(tsk->group, node, port, blks, 964 &mb)); 965 if (unlikely(rc)) 966 return rc; 967 968 if (unlikely(!mb)) 969 return -EHOSTUNREACH; 970 971 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 972 973 return rc ? rc : dlen; 974 } 975 976 /** 977 * tipc_send_group_anycast - send message to any member with given identity 978 * @sock: socket structure 979 * @m: message to send 980 * @dlen: total length of message data 981 * @timeout: timeout to wait for wakeup 982 * 983 * Called from function tipc_sendmsg(), which has done all sanity checks 984 * Returns the number of bytes sent on success, or errno 985 */ 986 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 987 int dlen, long timeout) 988 { 989 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 990 struct sock *sk = sock->sk; 991 struct tipc_sock *tsk = tipc_sk(sk); 992 struct list_head *cong_links = &tsk->cong_links; 993 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 994 struct tipc_msg *hdr = &tsk->phdr; 995 struct tipc_member *first = NULL; 996 struct tipc_member *mbr = NULL; 997 struct net *net = sock_net(sk); 998 u32 node, port, exclude; 999 struct list_head dsts; 1000 u32 type, inst, scope; 1001 int lookups = 0; 1002 int dstcnt, rc; 1003 bool cong; 1004 1005 INIT_LIST_HEAD(&dsts); 1006 1007 type = msg_nametype(hdr); 1008 inst = dest->addr.name.name.instance; 1009 scope = msg_lookup_scope(hdr); 1010 1011 while (++lookups < 4) { 1012 exclude = tipc_group_exclude(tsk->group); 1013 1014 first = NULL; 1015 1016 /* Look for a non-congested destination member, if any */ 1017 while (1) { 1018 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 1019 &dstcnt, exclude, false)) 1020 return -EHOSTUNREACH; 1021 tipc_dest_pop(&dsts, &node, &port); 1022 cong = tipc_group_cong(tsk->group, node, port, blks, 1023 &mbr); 1024 if (!cong) 1025 break; 1026 if (mbr == first) 1027 break; 1028 if (!first) 1029 first = mbr; 1030 } 1031 1032 /* Start over if destination was not in member list */ 1033 if (unlikely(!mbr)) 1034 continue; 1035 1036 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1037 break; 1038 1039 /* Block or return if destination link or member is congested */ 1040 rc = tipc_wait_for_cond(sock, &timeout, 1041 !tipc_dest_find(cong_links, node, 0) && 1042 tsk->group && 1043 !tipc_group_cong(tsk->group, node, port, 1044 blks, &mbr)); 1045 if (unlikely(rc)) 1046 return rc; 1047 1048 /* Send, unless destination disappeared while waiting */ 1049 if (likely(mbr)) 1050 break; 1051 } 1052 1053 if (unlikely(lookups >= 4)) 1054 return -EHOSTUNREACH; 1055 1056 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1057 1058 return rc ? rc : dlen; 1059 } 1060 1061 /** 1062 * tipc_send_group_bcast - send message to all members in communication group 1063 * @sock: socket structure 1064 * @m: message to send 1065 * @dlen: total length of message data 1066 * @timeout: timeout to wait for wakeup 1067 * 1068 * Called from function tipc_sendmsg(), which has done all sanity checks 1069 * Returns the number of bytes sent on success, or errno 1070 */ 1071 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1072 int dlen, long timeout) 1073 { 1074 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1075 struct sock *sk = sock->sk; 1076 struct net *net = sock_net(sk); 1077 struct tipc_sock *tsk = tipc_sk(sk); 1078 struct tipc_nlist *dsts; 1079 struct tipc_mc_method *method = &tsk->mc_method; 1080 bool ack = method->mandatory && method->rcast; 1081 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1082 struct tipc_msg *hdr = &tsk->phdr; 1083 int mtu = tipc_bcast_get_mtu(net); 1084 struct sk_buff_head pkts; 1085 int rc = -EHOSTUNREACH; 1086 1087 /* Block or return if any destination link or member is congested */ 1088 rc = tipc_wait_for_cond(sock, &timeout, 1089 !tsk->cong_link_cnt && tsk->group && 1090 !tipc_group_bc_cong(tsk->group, blks)); 1091 if (unlikely(rc)) 1092 return rc; 1093 1094 dsts = tipc_group_dests(tsk->group); 1095 if (!dsts->local && !dsts->remote) 1096 return -EHOSTUNREACH; 1097 1098 /* Complete message header */ 1099 if (dest) { 1100 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1101 msg_set_nameinst(hdr, dest->addr.name.name.instance); 1102 } else { 1103 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1104 msg_set_nameinst(hdr, 0); 1105 } 1106 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1107 msg_set_destport(hdr, 0); 1108 msg_set_destnode(hdr, 0); 1109 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1110 1111 /* Avoid getting stuck with repeated forced replicasts */ 1112 msg_set_grp_bc_ack_req(hdr, ack); 1113 1114 /* Build message as chain of buffers */ 1115 __skb_queue_head_init(&pkts); 1116 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1117 if (unlikely(rc != dlen)) 1118 return rc; 1119 1120 /* Send message */ 1121 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1122 if (unlikely(rc)) 1123 return rc; 1124 1125 /* Update broadcast sequence number and send windows */ 1126 tipc_group_update_bc_members(tsk->group, blks, ack); 1127 1128 /* Broadcast link is now free to choose method for next broadcast */ 1129 method->mandatory = false; 1130 method->expires = jiffies; 1131 1132 return dlen; 1133 } 1134 1135 /** 1136 * tipc_send_group_mcast - send message to all members with given identity 1137 * @sock: socket structure 1138 * @m: message to send 1139 * @dlen: total length of message data 1140 * @timeout: timeout to wait for wakeup 1141 * 1142 * Called from function tipc_sendmsg(), which has done all sanity checks 1143 * Returns the number of bytes sent on success, or errno 1144 */ 1145 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1146 int dlen, long timeout) 1147 { 1148 struct sock *sk = sock->sk; 1149 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1150 struct tipc_sock *tsk = tipc_sk(sk); 1151 struct tipc_group *grp = tsk->group; 1152 struct tipc_msg *hdr = &tsk->phdr; 1153 struct net *net = sock_net(sk); 1154 u32 type, inst, scope, exclude; 1155 struct list_head dsts; 1156 u32 dstcnt; 1157 1158 INIT_LIST_HEAD(&dsts); 1159 1160 type = msg_nametype(hdr); 1161 inst = dest->addr.name.name.instance; 1162 scope = msg_lookup_scope(hdr); 1163 exclude = tipc_group_exclude(grp); 1164 1165 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts, 1166 &dstcnt, exclude, true)) 1167 return -EHOSTUNREACH; 1168 1169 if (dstcnt == 1) { 1170 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref); 1171 return tipc_send_group_unicast(sock, m, dlen, timeout); 1172 } 1173 1174 tipc_dest_list_purge(&dsts); 1175 return tipc_send_group_bcast(sock, m, dlen, timeout); 1176 } 1177 1178 /** 1179 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1180 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1181 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1182 * 1183 * Multi-threaded: parallel calls with reference to same queues may occur 1184 */ 1185 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1186 struct sk_buff_head *inputq) 1187 { 1188 u32 self = tipc_own_addr(net); 1189 u32 type, lower, upper, scope; 1190 struct sk_buff *skb, *_skb; 1191 u32 portid, onode; 1192 struct sk_buff_head tmpq; 1193 struct list_head dports; 1194 struct tipc_msg *hdr; 1195 int user, mtyp, hlen; 1196 bool exact; 1197 1198 __skb_queue_head_init(&tmpq); 1199 INIT_LIST_HEAD(&dports); 1200 1201 skb = tipc_skb_peek(arrvq, &inputq->lock); 1202 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1203 hdr = buf_msg(skb); 1204 user = msg_user(hdr); 1205 mtyp = msg_type(hdr); 1206 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1207 onode = msg_orignode(hdr); 1208 type = msg_nametype(hdr); 1209 1210 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1211 spin_lock_bh(&inputq->lock); 1212 if (skb_peek(arrvq) == skb) { 1213 __skb_dequeue(arrvq); 1214 __skb_queue_tail(inputq, skb); 1215 } 1216 kfree_skb(skb); 1217 spin_unlock_bh(&inputq->lock); 1218 continue; 1219 } 1220 1221 /* Group messages require exact scope match */ 1222 if (msg_in_group(hdr)) { 1223 lower = 0; 1224 upper = ~0; 1225 scope = msg_lookup_scope(hdr); 1226 exact = true; 1227 } else { 1228 /* TIPC_NODE_SCOPE means "any scope" in this context */ 1229 if (onode == self) 1230 scope = TIPC_NODE_SCOPE; 1231 else 1232 scope = TIPC_CLUSTER_SCOPE; 1233 exact = false; 1234 lower = msg_namelower(hdr); 1235 upper = msg_nameupper(hdr); 1236 } 1237 1238 /* Create destination port list: */ 1239 tipc_nametbl_mc_lookup(net, type, lower, upper, 1240 scope, exact, &dports); 1241 1242 /* Clone message per destination */ 1243 while (tipc_dest_pop(&dports, NULL, &portid)) { 1244 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1245 if (_skb) { 1246 msg_set_destport(buf_msg(_skb), portid); 1247 __skb_queue_tail(&tmpq, _skb); 1248 continue; 1249 } 1250 pr_warn("Failed to clone mcast rcv buffer\n"); 1251 } 1252 /* Append to inputq if not already done by other thread */ 1253 spin_lock_bh(&inputq->lock); 1254 if (skb_peek(arrvq) == skb) { 1255 skb_queue_splice_tail_init(&tmpq, inputq); 1256 kfree_skb(__skb_dequeue(arrvq)); 1257 } 1258 spin_unlock_bh(&inputq->lock); 1259 __skb_queue_purge(&tmpq); 1260 kfree_skb(skb); 1261 } 1262 tipc_sk_rcv(net, inputq); 1263 } 1264 1265 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1266 * when socket is in Nagle mode 1267 */ 1268 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1269 { 1270 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1271 struct sk_buff *skb = skb_peek_tail(txq); 1272 struct net *net = sock_net(&tsk->sk); 1273 u32 dnode = tsk_peer_node(tsk); 1274 int rc; 1275 1276 if (nagle_ack) { 1277 tsk->pkt_cnt += skb_queue_len(txq); 1278 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1279 tsk->oneway = 0; 1280 if (tsk->nagle_start < NAGLE_START_MAX) 1281 tsk->nagle_start *= 2; 1282 tsk->expect_ack = false; 1283 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1284 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1285 tsk->nagle_start); 1286 } else { 1287 tsk->nagle_start = NAGLE_START_INIT; 1288 if (skb) { 1289 msg_set_ack_required(buf_msg(skb)); 1290 tsk->expect_ack = true; 1291 } else { 1292 tsk->expect_ack = false; 1293 } 1294 } 1295 tsk->msg_acc = 0; 1296 tsk->pkt_cnt = 0; 1297 } 1298 1299 if (!skb || tsk->cong_link_cnt) 1300 return; 1301 1302 /* Do not send SYN again after congestion */ 1303 if (msg_is_syn(buf_msg(skb))) 1304 return; 1305 1306 if (tsk->msg_acc) 1307 tsk->pkt_cnt += skb_queue_len(txq); 1308 tsk->snt_unacked += tsk->snd_backlog; 1309 tsk->snd_backlog = 0; 1310 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1311 if (rc == -ELINKCONG) 1312 tsk->cong_link_cnt = 1; 1313 } 1314 1315 /** 1316 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1317 * @tsk: receiving socket 1318 * @skb: pointer to message buffer. 1319 */ 1320 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1321 struct sk_buff_head *inputq, 1322 struct sk_buff_head *xmitq) 1323 { 1324 struct tipc_msg *hdr = buf_msg(skb); 1325 u32 onode = tsk_own_node(tsk); 1326 struct sock *sk = &tsk->sk; 1327 int mtyp = msg_type(hdr); 1328 bool was_cong; 1329 1330 /* Ignore if connection cannot be validated: */ 1331 if (!tsk_peer_msg(tsk, hdr)) { 1332 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1333 goto exit; 1334 } 1335 1336 if (unlikely(msg_errcode(hdr))) { 1337 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1338 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1339 tsk_peer_port(tsk)); 1340 sk->sk_state_change(sk); 1341 1342 /* State change is ignored if socket already awake, 1343 * - convert msg to abort msg and add to inqueue 1344 */ 1345 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1346 msg_set_type(hdr, TIPC_CONN_MSG); 1347 msg_set_size(hdr, BASIC_H_SIZE); 1348 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1349 __skb_queue_tail(inputq, skb); 1350 return; 1351 } 1352 1353 tsk->probe_unacked = false; 1354 1355 if (mtyp == CONN_PROBE) { 1356 msg_set_type(hdr, CONN_PROBE_REPLY); 1357 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1358 __skb_queue_tail(xmitq, skb); 1359 return; 1360 } else if (mtyp == CONN_ACK) { 1361 was_cong = tsk_conn_cong(tsk); 1362 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1363 tsk->snt_unacked -= msg_conn_ack(hdr); 1364 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1365 tsk->snd_win = msg_adv_win(hdr); 1366 if (was_cong && !tsk_conn_cong(tsk)) 1367 sk->sk_write_space(sk); 1368 } else if (mtyp != CONN_PROBE_REPLY) { 1369 pr_warn("Received unknown CONN_PROTO msg\n"); 1370 } 1371 exit: 1372 kfree_skb(skb); 1373 } 1374 1375 /** 1376 * tipc_sendmsg - send message in connectionless manner 1377 * @sock: socket structure 1378 * @m: message to send 1379 * @dsz: amount of user data to be sent 1380 * 1381 * Message must have an destination specified explicitly. 1382 * Used for SOCK_RDM and SOCK_DGRAM messages, 1383 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1384 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1385 * 1386 * Returns the number of bytes sent on success, or errno otherwise 1387 */ 1388 static int tipc_sendmsg(struct socket *sock, 1389 struct msghdr *m, size_t dsz) 1390 { 1391 struct sock *sk = sock->sk; 1392 int ret; 1393 1394 lock_sock(sk); 1395 ret = __tipc_sendmsg(sock, m, dsz); 1396 release_sock(sk); 1397 1398 return ret; 1399 } 1400 1401 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1402 { 1403 struct sock *sk = sock->sk; 1404 struct net *net = sock_net(sk); 1405 struct tipc_sock *tsk = tipc_sk(sk); 1406 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1407 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1408 struct list_head *clinks = &tsk->cong_links; 1409 bool syn = !tipc_sk_type_connectionless(sk); 1410 struct tipc_group *grp = tsk->group; 1411 struct tipc_msg *hdr = &tsk->phdr; 1412 struct tipc_name_seq *seq; 1413 struct sk_buff_head pkts; 1414 u32 dport = 0, dnode = 0; 1415 u32 type = 0, inst = 0; 1416 int mtu, rc; 1417 1418 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1419 return -EMSGSIZE; 1420 1421 if (likely(dest)) { 1422 if (unlikely(m->msg_namelen < sizeof(*dest))) 1423 return -EINVAL; 1424 if (unlikely(dest->family != AF_TIPC)) 1425 return -EINVAL; 1426 } 1427 1428 if (grp) { 1429 if (!dest) 1430 return tipc_send_group_bcast(sock, m, dlen, timeout); 1431 if (dest->addrtype == TIPC_ADDR_NAME) 1432 return tipc_send_group_anycast(sock, m, dlen, timeout); 1433 if (dest->addrtype == TIPC_ADDR_ID) 1434 return tipc_send_group_unicast(sock, m, dlen, timeout); 1435 if (dest->addrtype == TIPC_ADDR_MCAST) 1436 return tipc_send_group_mcast(sock, m, dlen, timeout); 1437 return -EINVAL; 1438 } 1439 1440 if (unlikely(!dest)) { 1441 dest = &tsk->peer; 1442 if (!syn && dest->family != AF_TIPC) 1443 return -EDESTADDRREQ; 1444 } 1445 1446 if (unlikely(syn)) { 1447 if (sk->sk_state == TIPC_LISTEN) 1448 return -EPIPE; 1449 if (sk->sk_state != TIPC_OPEN) 1450 return -EISCONN; 1451 if (tsk->published) 1452 return -EOPNOTSUPP; 1453 if (dest->addrtype == TIPC_ADDR_NAME) { 1454 tsk->conn_type = dest->addr.name.name.type; 1455 tsk->conn_instance = dest->addr.name.name.instance; 1456 } 1457 msg_set_syn(hdr, 1); 1458 } 1459 1460 seq = &dest->addr.nameseq; 1461 if (dest->addrtype == TIPC_ADDR_MCAST) 1462 return tipc_sendmcast(sock, seq, m, dlen, timeout); 1463 1464 if (dest->addrtype == TIPC_ADDR_NAME) { 1465 type = dest->addr.name.name.type; 1466 inst = dest->addr.name.name.instance; 1467 dnode = dest->addr.name.domain; 1468 dport = tipc_nametbl_translate(net, type, inst, &dnode); 1469 if (unlikely(!dport && !dnode)) 1470 return -EHOSTUNREACH; 1471 } else if (dest->addrtype == TIPC_ADDR_ID) { 1472 dnode = dest->addr.id.node; 1473 } else { 1474 return -EINVAL; 1475 } 1476 1477 /* Block or return if destination link is congested */ 1478 rc = tipc_wait_for_cond(sock, &timeout, 1479 !tipc_dest_find(clinks, dnode, 0)); 1480 if (unlikely(rc)) 1481 return rc; 1482 1483 if (dest->addrtype == TIPC_ADDR_NAME) { 1484 msg_set_type(hdr, TIPC_NAMED_MSG); 1485 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1486 msg_set_nametype(hdr, type); 1487 msg_set_nameinst(hdr, inst); 1488 msg_set_lookup_scope(hdr, tipc_node2scope(dnode)); 1489 msg_set_destnode(hdr, dnode); 1490 msg_set_destport(hdr, dport); 1491 } else { /* TIPC_ADDR_ID */ 1492 msg_set_type(hdr, TIPC_DIRECT_MSG); 1493 msg_set_lookup_scope(hdr, 0); 1494 msg_set_destnode(hdr, dnode); 1495 msg_set_destport(hdr, dest->addr.id.ref); 1496 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1497 } 1498 1499 __skb_queue_head_init(&pkts); 1500 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, true); 1501 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1502 if (unlikely(rc != dlen)) 1503 return rc; 1504 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1505 __skb_queue_purge(&pkts); 1506 return -ENOMEM; 1507 } 1508 1509 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1510 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 1511 if (unlikely(rc == -ELINKCONG)) { 1512 tipc_dest_push(clinks, dnode, 0); 1513 tsk->cong_link_cnt++; 1514 rc = 0; 1515 } 1516 1517 if (unlikely(syn && !rc)) 1518 tipc_set_sk_state(sk, TIPC_CONNECTING); 1519 1520 return rc ? rc : dlen; 1521 } 1522 1523 /** 1524 * tipc_sendstream - send stream-oriented data 1525 * @sock: socket structure 1526 * @m: data to send 1527 * @dsz: total length of data to be transmitted 1528 * 1529 * Used for SOCK_STREAM data. 1530 * 1531 * Returns the number of bytes sent on success (or partial success), 1532 * or errno if no data sent 1533 */ 1534 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1535 { 1536 struct sock *sk = sock->sk; 1537 int ret; 1538 1539 lock_sock(sk); 1540 ret = __tipc_sendstream(sock, m, dsz); 1541 release_sock(sk); 1542 1543 return ret; 1544 } 1545 1546 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1547 { 1548 struct sock *sk = sock->sk; 1549 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1550 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1551 struct sk_buff_head *txq = &sk->sk_write_queue; 1552 struct tipc_sock *tsk = tipc_sk(sk); 1553 struct tipc_msg *hdr = &tsk->phdr; 1554 struct net *net = sock_net(sk); 1555 struct sk_buff *skb; 1556 u32 dnode = tsk_peer_node(tsk); 1557 int maxnagle = tsk->maxnagle; 1558 int maxpkt = tsk->max_pkt; 1559 int send, sent = 0; 1560 int blocks, rc = 0; 1561 1562 if (unlikely(dlen > INT_MAX)) 1563 return -EMSGSIZE; 1564 1565 /* Handle implicit connection setup */ 1566 if (unlikely(dest)) { 1567 rc = __tipc_sendmsg(sock, m, dlen); 1568 if (dlen && dlen == rc) { 1569 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1570 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1571 } 1572 return rc; 1573 } 1574 1575 do { 1576 rc = tipc_wait_for_cond(sock, &timeout, 1577 (!tsk->cong_link_cnt && 1578 !tsk_conn_cong(tsk) && 1579 tipc_sk_connected(sk))); 1580 if (unlikely(rc)) 1581 break; 1582 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1583 blocks = tsk->snd_backlog; 1584 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1585 send <= maxnagle) { 1586 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1587 if (unlikely(rc < 0)) 1588 break; 1589 blocks += rc; 1590 tsk->msg_acc++; 1591 if (blocks <= 64 && tsk->expect_ack) { 1592 tsk->snd_backlog = blocks; 1593 sent += send; 1594 break; 1595 } else if (blocks > 64) { 1596 tsk->pkt_cnt += skb_queue_len(txq); 1597 } else { 1598 skb = skb_peek_tail(txq); 1599 if (skb) { 1600 msg_set_ack_required(buf_msg(skb)); 1601 tsk->expect_ack = true; 1602 } else { 1603 tsk->expect_ack = false; 1604 } 1605 tsk->msg_acc = 0; 1606 tsk->pkt_cnt = 0; 1607 } 1608 } else { 1609 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1610 if (unlikely(rc != send)) 1611 break; 1612 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1613 } 1614 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1615 TIPC_DUMP_SK_SNDQ, " "); 1616 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1617 if (unlikely(rc == -ELINKCONG)) { 1618 tsk->cong_link_cnt = 1; 1619 rc = 0; 1620 } 1621 if (likely(!rc)) { 1622 tsk->snt_unacked += blocks; 1623 tsk->snd_backlog = 0; 1624 sent += send; 1625 } 1626 } while (sent < dlen && !rc); 1627 1628 return sent ? sent : rc; 1629 } 1630 1631 /** 1632 * tipc_send_packet - send a connection-oriented message 1633 * @sock: socket structure 1634 * @m: message to send 1635 * @dsz: length of data to be transmitted 1636 * 1637 * Used for SOCK_SEQPACKET messages. 1638 * 1639 * Returns the number of bytes sent on success, or errno otherwise 1640 */ 1641 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1642 { 1643 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1644 return -EMSGSIZE; 1645 1646 return tipc_sendstream(sock, m, dsz); 1647 } 1648 1649 /* tipc_sk_finish_conn - complete the setup of a connection 1650 */ 1651 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1652 u32 peer_node) 1653 { 1654 struct sock *sk = &tsk->sk; 1655 struct net *net = sock_net(sk); 1656 struct tipc_msg *msg = &tsk->phdr; 1657 1658 msg_set_syn(msg, 0); 1659 msg_set_destnode(msg, peer_node); 1660 msg_set_destport(msg, peer_port); 1661 msg_set_type(msg, TIPC_CONN_MSG); 1662 msg_set_lookup_scope(msg, 0); 1663 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1664 1665 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1666 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1667 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1668 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1669 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1670 tsk_set_nagle(tsk); 1671 __skb_queue_purge(&sk->sk_write_queue); 1672 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1673 return; 1674 1675 /* Fall back to message based flow control */ 1676 tsk->rcv_win = FLOWCTL_MSG_WIN; 1677 tsk->snd_win = FLOWCTL_MSG_WIN; 1678 } 1679 1680 /** 1681 * tipc_sk_set_orig_addr - capture sender's address for received message 1682 * @m: descriptor for message info 1683 * @skb: received message 1684 * 1685 * Note: Address is not captured if not requested by receiver. 1686 */ 1687 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1688 { 1689 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1690 struct tipc_msg *hdr = buf_msg(skb); 1691 1692 if (!srcaddr) 1693 return; 1694 1695 srcaddr->sock.family = AF_TIPC; 1696 srcaddr->sock.addrtype = TIPC_ADDR_ID; 1697 srcaddr->sock.scope = 0; 1698 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1699 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1700 srcaddr->sock.addr.name.domain = 0; 1701 m->msg_namelen = sizeof(struct sockaddr_tipc); 1702 1703 if (!msg_in_group(hdr)) 1704 return; 1705 1706 /* Group message users may also want to know sending member's id */ 1707 srcaddr->member.family = AF_TIPC; 1708 srcaddr->member.addrtype = TIPC_ADDR_NAME; 1709 srcaddr->member.scope = 0; 1710 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1711 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1712 srcaddr->member.addr.name.domain = 0; 1713 m->msg_namelen = sizeof(*srcaddr); 1714 } 1715 1716 /** 1717 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1718 * @m: descriptor for message info 1719 * @skb: received message buffer 1720 * @tsk: TIPC port associated with message 1721 * 1722 * Note: Ancillary data is not captured if not requested by receiver. 1723 * 1724 * Returns 0 if successful, otherwise errno 1725 */ 1726 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1727 struct tipc_sock *tsk) 1728 { 1729 struct tipc_msg *msg; 1730 u32 anc_data[3]; 1731 u32 err; 1732 u32 dest_type; 1733 int has_name; 1734 int res; 1735 1736 if (likely(m->msg_controllen == 0)) 1737 return 0; 1738 msg = buf_msg(skb); 1739 1740 /* Optionally capture errored message object(s) */ 1741 err = msg ? msg_errcode(msg) : 0; 1742 if (unlikely(err)) { 1743 anc_data[0] = err; 1744 anc_data[1] = msg_data_sz(msg); 1745 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); 1746 if (res) 1747 return res; 1748 if (anc_data[1]) { 1749 if (skb_linearize(skb)) 1750 return -ENOMEM; 1751 msg = buf_msg(skb); 1752 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], 1753 msg_data(msg)); 1754 if (res) 1755 return res; 1756 } 1757 } 1758 1759 /* Optionally capture message destination object */ 1760 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 1761 switch (dest_type) { 1762 case TIPC_NAMED_MSG: 1763 has_name = 1; 1764 anc_data[0] = msg_nametype(msg); 1765 anc_data[1] = msg_namelower(msg); 1766 anc_data[2] = msg_namelower(msg); 1767 break; 1768 case TIPC_MCAST_MSG: 1769 has_name = 1; 1770 anc_data[0] = msg_nametype(msg); 1771 anc_data[1] = msg_namelower(msg); 1772 anc_data[2] = msg_nameupper(msg); 1773 break; 1774 case TIPC_CONN_MSG: 1775 has_name = (tsk->conn_type != 0); 1776 anc_data[0] = tsk->conn_type; 1777 anc_data[1] = tsk->conn_instance; 1778 anc_data[2] = tsk->conn_instance; 1779 break; 1780 default: 1781 has_name = 0; 1782 } 1783 if (has_name) { 1784 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); 1785 if (res) 1786 return res; 1787 } 1788 1789 return 0; 1790 } 1791 1792 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1793 { 1794 struct sock *sk = &tsk->sk; 1795 struct sk_buff *skb = NULL; 1796 struct tipc_msg *msg; 1797 u32 peer_port = tsk_peer_port(tsk); 1798 u32 dnode = tsk_peer_node(tsk); 1799 1800 if (!tipc_sk_connected(sk)) 1801 return NULL; 1802 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1803 dnode, tsk_own_node(tsk), peer_port, 1804 tsk->portid, TIPC_OK); 1805 if (!skb) 1806 return NULL; 1807 msg = buf_msg(skb); 1808 msg_set_conn_ack(msg, tsk->rcv_unacked); 1809 tsk->rcv_unacked = 0; 1810 1811 /* Adjust to and advertize the correct window limit */ 1812 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1813 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1814 msg_set_adv_win(msg, tsk->rcv_win); 1815 } 1816 return skb; 1817 } 1818 1819 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1820 { 1821 struct sk_buff *skb; 1822 1823 skb = tipc_sk_build_ack(tsk); 1824 if (!skb) 1825 return; 1826 1827 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1828 msg_link_selector(buf_msg(skb))); 1829 } 1830 1831 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1832 { 1833 struct sock *sk = sock->sk; 1834 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1835 long timeo = *timeop; 1836 int err = sock_error(sk); 1837 1838 if (err) 1839 return err; 1840 1841 for (;;) { 1842 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1843 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1844 err = -ENOTCONN; 1845 break; 1846 } 1847 add_wait_queue(sk_sleep(sk), &wait); 1848 release_sock(sk); 1849 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1850 sched_annotate_sleep(); 1851 lock_sock(sk); 1852 remove_wait_queue(sk_sleep(sk), &wait); 1853 } 1854 err = 0; 1855 if (!skb_queue_empty(&sk->sk_receive_queue)) 1856 break; 1857 err = -EAGAIN; 1858 if (!timeo) 1859 break; 1860 err = sock_intr_errno(timeo); 1861 if (signal_pending(current)) 1862 break; 1863 1864 err = sock_error(sk); 1865 if (err) 1866 break; 1867 } 1868 *timeop = timeo; 1869 return err; 1870 } 1871 1872 /** 1873 * tipc_recvmsg - receive packet-oriented message 1874 * @m: descriptor for message info 1875 * @buflen: length of user buffer area 1876 * @flags: receive flags 1877 * 1878 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1879 * If the complete message doesn't fit in user area, truncate it. 1880 * 1881 * Returns size of returned message data, errno otherwise 1882 */ 1883 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1884 size_t buflen, int flags) 1885 { 1886 struct sock *sk = sock->sk; 1887 bool connected = !tipc_sk_type_connectionless(sk); 1888 struct tipc_sock *tsk = tipc_sk(sk); 1889 int rc, err, hlen, dlen, copy; 1890 struct sk_buff_head xmitq; 1891 struct tipc_msg *hdr; 1892 struct sk_buff *skb; 1893 bool grp_evt; 1894 long timeout; 1895 1896 /* Catch invalid receive requests */ 1897 if (unlikely(!buflen)) 1898 return -EINVAL; 1899 1900 lock_sock(sk); 1901 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1902 rc = -ENOTCONN; 1903 goto exit; 1904 } 1905 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1906 1907 /* Step rcv queue to first msg with data or error; wait if necessary */ 1908 do { 1909 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1910 if (unlikely(rc)) 1911 goto exit; 1912 skb = skb_peek(&sk->sk_receive_queue); 1913 hdr = buf_msg(skb); 1914 dlen = msg_data_sz(hdr); 1915 hlen = msg_hdr_sz(hdr); 1916 err = msg_errcode(hdr); 1917 grp_evt = msg_is_grp_evt(hdr); 1918 if (likely(dlen || err)) 1919 break; 1920 tsk_advance_rx_queue(sk); 1921 } while (1); 1922 1923 /* Collect msg meta data, including error code and rejected data */ 1924 tipc_sk_set_orig_addr(m, skb); 1925 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1926 if (unlikely(rc)) 1927 goto exit; 1928 hdr = buf_msg(skb); 1929 1930 /* Capture data if non-error msg, otherwise just set return value */ 1931 if (likely(!err)) { 1932 copy = min_t(int, dlen, buflen); 1933 if (unlikely(copy != dlen)) 1934 m->msg_flags |= MSG_TRUNC; 1935 rc = skb_copy_datagram_msg(skb, hlen, m, copy); 1936 } else { 1937 copy = 0; 1938 rc = 0; 1939 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) 1940 rc = -ECONNRESET; 1941 } 1942 if (unlikely(rc)) 1943 goto exit; 1944 1945 /* Mark message as group event if applicable */ 1946 if (unlikely(grp_evt)) { 1947 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1948 m->msg_flags |= MSG_EOR; 1949 m->msg_flags |= MSG_OOB; 1950 copy = 0; 1951 } 1952 1953 /* Caption of data or error code/rejected data was successful */ 1954 if (unlikely(flags & MSG_PEEK)) 1955 goto exit; 1956 1957 /* Send group flow control advertisement when applicable */ 1958 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1959 __skb_queue_head_init(&xmitq); 1960 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1961 msg_orignode(hdr), msg_origport(hdr), 1962 &xmitq); 1963 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1964 } 1965 1966 tsk_advance_rx_queue(sk); 1967 1968 if (likely(!connected)) 1969 goto exit; 1970 1971 /* Send connection flow control advertisement when applicable */ 1972 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1973 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1974 tipc_sk_send_ack(tsk); 1975 exit: 1976 release_sock(sk); 1977 return rc ? rc : copy; 1978 } 1979 1980 /** 1981 * tipc_recvstream - receive stream-oriented data 1982 * @m: descriptor for message info 1983 * @buflen: total size of user buffer area 1984 * @flags: receive flags 1985 * 1986 * Used for SOCK_STREAM messages only. If not enough data is available 1987 * will optionally wait for more; never truncates data. 1988 * 1989 * Returns size of returned message data, errno otherwise 1990 */ 1991 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 1992 size_t buflen, int flags) 1993 { 1994 struct sock *sk = sock->sk; 1995 struct tipc_sock *tsk = tipc_sk(sk); 1996 struct sk_buff *skb; 1997 struct tipc_msg *hdr; 1998 struct tipc_skb_cb *skb_cb; 1999 bool peek = flags & MSG_PEEK; 2000 int offset, required, copy, copied = 0; 2001 int hlen, dlen, err, rc; 2002 long timeout; 2003 2004 /* Catch invalid receive attempts */ 2005 if (unlikely(!buflen)) 2006 return -EINVAL; 2007 2008 lock_sock(sk); 2009 2010 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2011 rc = -ENOTCONN; 2012 goto exit; 2013 } 2014 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2015 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2016 2017 do { 2018 /* Look at first msg in receive queue; wait if necessary */ 2019 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2020 if (unlikely(rc)) 2021 break; 2022 skb = skb_peek(&sk->sk_receive_queue); 2023 skb_cb = TIPC_SKB_CB(skb); 2024 hdr = buf_msg(skb); 2025 dlen = msg_data_sz(hdr); 2026 hlen = msg_hdr_sz(hdr); 2027 err = msg_errcode(hdr); 2028 2029 /* Discard any empty non-errored (SYN-) message */ 2030 if (unlikely(!dlen && !err)) { 2031 tsk_advance_rx_queue(sk); 2032 continue; 2033 } 2034 2035 /* Collect msg meta data, incl. error code and rejected data */ 2036 if (!copied) { 2037 tipc_sk_set_orig_addr(m, skb); 2038 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2039 if (rc) 2040 break; 2041 hdr = buf_msg(skb); 2042 } 2043 2044 /* Copy data if msg ok, otherwise return error/partial data */ 2045 if (likely(!err)) { 2046 offset = skb_cb->bytes_read; 2047 copy = min_t(int, dlen - offset, buflen - copied); 2048 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2049 if (unlikely(rc)) 2050 break; 2051 copied += copy; 2052 offset += copy; 2053 if (unlikely(offset < dlen)) { 2054 if (!peek) 2055 skb_cb->bytes_read = offset; 2056 break; 2057 } 2058 } else { 2059 rc = 0; 2060 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2061 rc = -ECONNRESET; 2062 if (copied || rc) 2063 break; 2064 } 2065 2066 if (unlikely(peek)) 2067 break; 2068 2069 tsk_advance_rx_queue(sk); 2070 2071 /* Send connection flow control advertisement when applicable */ 2072 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2073 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2074 tipc_sk_send_ack(tsk); 2075 2076 /* Exit if all requested data or FIN/error received */ 2077 if (copied == buflen || err) 2078 break; 2079 2080 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2081 exit: 2082 release_sock(sk); 2083 return copied ? copied : rc; 2084 } 2085 2086 /** 2087 * tipc_write_space - wake up thread if port congestion is released 2088 * @sk: socket 2089 */ 2090 static void tipc_write_space(struct sock *sk) 2091 { 2092 struct socket_wq *wq; 2093 2094 rcu_read_lock(); 2095 wq = rcu_dereference(sk->sk_wq); 2096 if (skwq_has_sleeper(wq)) 2097 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2098 EPOLLWRNORM | EPOLLWRBAND); 2099 rcu_read_unlock(); 2100 } 2101 2102 /** 2103 * tipc_data_ready - wake up threads to indicate messages have been received 2104 * @sk: socket 2105 */ 2106 static void tipc_data_ready(struct sock *sk) 2107 { 2108 struct socket_wq *wq; 2109 2110 rcu_read_lock(); 2111 wq = rcu_dereference(sk->sk_wq); 2112 if (skwq_has_sleeper(wq)) 2113 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2114 EPOLLRDNORM | EPOLLRDBAND); 2115 rcu_read_unlock(); 2116 } 2117 2118 static void tipc_sock_destruct(struct sock *sk) 2119 { 2120 __skb_queue_purge(&sk->sk_receive_queue); 2121 } 2122 2123 static void tipc_sk_proto_rcv(struct sock *sk, 2124 struct sk_buff_head *inputq, 2125 struct sk_buff_head *xmitq) 2126 { 2127 struct sk_buff *skb = __skb_dequeue(inputq); 2128 struct tipc_sock *tsk = tipc_sk(sk); 2129 struct tipc_msg *hdr = buf_msg(skb); 2130 struct tipc_group *grp = tsk->group; 2131 bool wakeup = false; 2132 2133 switch (msg_user(hdr)) { 2134 case CONN_MANAGER: 2135 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2136 return; 2137 case SOCK_WAKEUP: 2138 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2139 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2140 smp_wmb(); 2141 tsk->cong_link_cnt--; 2142 wakeup = true; 2143 tipc_sk_push_backlog(tsk, false); 2144 break; 2145 case GROUP_PROTOCOL: 2146 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2147 break; 2148 case TOP_SRV: 2149 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2150 hdr, inputq, xmitq); 2151 break; 2152 default: 2153 break; 2154 } 2155 2156 if (wakeup) 2157 sk->sk_write_space(sk); 2158 2159 kfree_skb(skb); 2160 } 2161 2162 /** 2163 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2164 * @tsk: TIPC socket 2165 * @skb: pointer to message buffer. 2166 * @xmitq: for Nagle ACK if any 2167 * Returns true if message should be added to receive queue, false otherwise 2168 */ 2169 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2170 struct sk_buff_head *xmitq) 2171 { 2172 struct sock *sk = &tsk->sk; 2173 struct net *net = sock_net(sk); 2174 struct tipc_msg *hdr = buf_msg(skb); 2175 bool con_msg = msg_connected(hdr); 2176 u32 pport = tsk_peer_port(tsk); 2177 u32 pnode = tsk_peer_node(tsk); 2178 u32 oport = msg_origport(hdr); 2179 u32 onode = msg_orignode(hdr); 2180 int err = msg_errcode(hdr); 2181 unsigned long delay; 2182 2183 if (unlikely(msg_mcast(hdr))) 2184 return false; 2185 tsk->oneway = 0; 2186 2187 switch (sk->sk_state) { 2188 case TIPC_CONNECTING: 2189 /* Setup ACK */ 2190 if (likely(con_msg)) { 2191 if (err) 2192 break; 2193 tipc_sk_finish_conn(tsk, oport, onode); 2194 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2195 /* ACK+ message with data is added to receive queue */ 2196 if (msg_data_sz(hdr)) 2197 return true; 2198 /* Empty ACK-, - wake up sleeping connect() and drop */ 2199 sk->sk_state_change(sk); 2200 msg_set_dest_droppable(hdr, 1); 2201 return false; 2202 } 2203 /* Ignore connectionless message if not from listening socket */ 2204 if (oport != pport || onode != pnode) 2205 return false; 2206 2207 /* Rejected SYN */ 2208 if (err != TIPC_ERR_OVERLOAD) 2209 break; 2210 2211 /* Prepare for new setup attempt if we have a SYN clone */ 2212 if (skb_queue_empty(&sk->sk_write_queue)) 2213 break; 2214 get_random_bytes(&delay, 2); 2215 delay %= (tsk->conn_timeout / 4); 2216 delay = msecs_to_jiffies(delay + 100); 2217 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2218 return false; 2219 case TIPC_OPEN: 2220 case TIPC_DISCONNECTING: 2221 return false; 2222 case TIPC_LISTEN: 2223 /* Accept only SYN message */ 2224 if (!msg_is_syn(hdr) && 2225 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2226 return false; 2227 if (!con_msg && !err) 2228 return true; 2229 return false; 2230 case TIPC_ESTABLISHED: 2231 if (!skb_queue_empty(&sk->sk_write_queue)) 2232 tipc_sk_push_backlog(tsk, false); 2233 /* Accept only connection-based messages sent by peer */ 2234 if (likely(con_msg && !err && pport == oport && 2235 pnode == onode)) { 2236 if (msg_ack_required(hdr)) { 2237 struct sk_buff *skb; 2238 2239 skb = tipc_sk_build_ack(tsk); 2240 if (skb) { 2241 msg_set_nagle_ack(buf_msg(skb)); 2242 __skb_queue_tail(xmitq, skb); 2243 } 2244 } 2245 return true; 2246 } 2247 if (!tsk_peer_msg(tsk, hdr)) 2248 return false; 2249 if (!err) 2250 return true; 2251 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2252 tipc_node_remove_conn(net, pnode, tsk->portid); 2253 sk->sk_state_change(sk); 2254 return true; 2255 default: 2256 pr_err("Unknown sk_state %u\n", sk->sk_state); 2257 } 2258 /* Abort connection setup attempt */ 2259 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2260 sk->sk_err = ECONNREFUSED; 2261 sk->sk_state_change(sk); 2262 return true; 2263 } 2264 2265 /** 2266 * rcvbuf_limit - get proper overload limit of socket receive queue 2267 * @sk: socket 2268 * @skb: message 2269 * 2270 * For connection oriented messages, irrespective of importance, 2271 * default queue limit is 2 MB. 2272 * 2273 * For connectionless messages, queue limits are based on message 2274 * importance as follows: 2275 * 2276 * TIPC_LOW_IMPORTANCE (2 MB) 2277 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2278 * TIPC_HIGH_IMPORTANCE (8 MB) 2279 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2280 * 2281 * Returns overload limit according to corresponding message importance 2282 */ 2283 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2284 { 2285 struct tipc_sock *tsk = tipc_sk(sk); 2286 struct tipc_msg *hdr = buf_msg(skb); 2287 2288 if (unlikely(msg_in_group(hdr))) 2289 return READ_ONCE(sk->sk_rcvbuf); 2290 2291 if (unlikely(!msg_connected(hdr))) 2292 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2293 2294 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2295 return READ_ONCE(sk->sk_rcvbuf); 2296 2297 return FLOWCTL_MSG_LIM; 2298 } 2299 2300 /** 2301 * tipc_sk_filter_rcv - validate incoming message 2302 * @sk: socket 2303 * @skb: pointer to message. 2304 * 2305 * Enqueues message on receive queue if acceptable; optionally handles 2306 * disconnect indication for a connected socket. 2307 * 2308 * Called with socket lock already taken 2309 * 2310 */ 2311 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2312 struct sk_buff_head *xmitq) 2313 { 2314 bool sk_conn = !tipc_sk_type_connectionless(sk); 2315 struct tipc_sock *tsk = tipc_sk(sk); 2316 struct tipc_group *grp = tsk->group; 2317 struct tipc_msg *hdr = buf_msg(skb); 2318 struct net *net = sock_net(sk); 2319 struct sk_buff_head inputq; 2320 int mtyp = msg_type(hdr); 2321 int limit, err = TIPC_OK; 2322 2323 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2324 TIPC_SKB_CB(skb)->bytes_read = 0; 2325 __skb_queue_head_init(&inputq); 2326 __skb_queue_tail(&inputq, skb); 2327 2328 if (unlikely(!msg_isdata(hdr))) 2329 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2330 2331 if (unlikely(grp)) 2332 tipc_group_filter_msg(grp, &inputq, xmitq); 2333 2334 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2335 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2336 2337 /* Validate and add to receive buffer if there is space */ 2338 while ((skb = __skb_dequeue(&inputq))) { 2339 hdr = buf_msg(skb); 2340 limit = rcvbuf_limit(sk, skb); 2341 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2342 (!sk_conn && msg_connected(hdr)) || 2343 (!grp && msg_in_group(hdr))) 2344 err = TIPC_ERR_NO_PORT; 2345 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2346 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2347 "err_overload2!"); 2348 atomic_inc(&sk->sk_drops); 2349 err = TIPC_ERR_OVERLOAD; 2350 } 2351 2352 if (unlikely(err)) { 2353 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2354 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2355 "@filter_rcv!"); 2356 __skb_queue_tail(xmitq, skb); 2357 } 2358 err = TIPC_OK; 2359 continue; 2360 } 2361 __skb_queue_tail(&sk->sk_receive_queue, skb); 2362 skb_set_owner_r(skb, sk); 2363 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2364 "rcvq >90% allocated!"); 2365 sk->sk_data_ready(sk); 2366 } 2367 } 2368 2369 /** 2370 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2371 * @sk: socket 2372 * @skb: message 2373 * 2374 * Caller must hold socket lock 2375 */ 2376 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2377 { 2378 unsigned int before = sk_rmem_alloc_get(sk); 2379 struct sk_buff_head xmitq; 2380 unsigned int added; 2381 2382 __skb_queue_head_init(&xmitq); 2383 2384 tipc_sk_filter_rcv(sk, skb, &xmitq); 2385 added = sk_rmem_alloc_get(sk) - before; 2386 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2387 2388 /* Send pending response/rejected messages, if any */ 2389 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2390 return 0; 2391 } 2392 2393 /** 2394 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2395 * inputq and try adding them to socket or backlog queue 2396 * @inputq: list of incoming buffers with potentially different destinations 2397 * @sk: socket where the buffers should be enqueued 2398 * @dport: port number for the socket 2399 * 2400 * Caller must hold socket lock 2401 */ 2402 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2403 u32 dport, struct sk_buff_head *xmitq) 2404 { 2405 unsigned long time_limit = jiffies + 2; 2406 struct sk_buff *skb; 2407 unsigned int lim; 2408 atomic_t *dcnt; 2409 u32 onode; 2410 2411 while (skb_queue_len(inputq)) { 2412 if (unlikely(time_after_eq(jiffies, time_limit))) 2413 return; 2414 2415 skb = tipc_skb_dequeue(inputq, dport); 2416 if (unlikely(!skb)) 2417 return; 2418 2419 /* Add message directly to receive queue if possible */ 2420 if (!sock_owned_by_user(sk)) { 2421 tipc_sk_filter_rcv(sk, skb, xmitq); 2422 continue; 2423 } 2424 2425 /* Try backlog, compensating for double-counted bytes */ 2426 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2427 if (!sk->sk_backlog.len) 2428 atomic_set(dcnt, 0); 2429 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2430 if (likely(!sk_add_backlog(sk, skb, lim))) { 2431 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2432 "bklg & rcvq >90% allocated!"); 2433 continue; 2434 } 2435 2436 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2437 /* Overload => reject message back to sender */ 2438 onode = tipc_own_addr(sock_net(sk)); 2439 atomic_inc(&sk->sk_drops); 2440 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2441 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2442 "@sk_enqueue!"); 2443 __skb_queue_tail(xmitq, skb); 2444 } 2445 break; 2446 } 2447 } 2448 2449 /** 2450 * tipc_sk_rcv - handle a chain of incoming buffers 2451 * @inputq: buffer list containing the buffers 2452 * Consumes all buffers in list until inputq is empty 2453 * Note: may be called in multiple threads referring to the same queue 2454 */ 2455 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2456 { 2457 struct sk_buff_head xmitq; 2458 u32 dnode, dport = 0; 2459 int err; 2460 struct tipc_sock *tsk; 2461 struct sock *sk; 2462 struct sk_buff *skb; 2463 2464 __skb_queue_head_init(&xmitq); 2465 while (skb_queue_len(inputq)) { 2466 dport = tipc_skb_peek_port(inputq, dport); 2467 tsk = tipc_sk_lookup(net, dport); 2468 2469 if (likely(tsk)) { 2470 sk = &tsk->sk; 2471 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2472 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2473 spin_unlock_bh(&sk->sk_lock.slock); 2474 } 2475 /* Send pending response/rejected messages, if any */ 2476 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2477 sock_put(sk); 2478 continue; 2479 } 2480 /* No destination socket => dequeue skb if still there */ 2481 skb = tipc_skb_dequeue(inputq, dport); 2482 if (!skb) 2483 return; 2484 2485 /* Try secondary lookup if unresolved named message */ 2486 err = TIPC_ERR_NO_PORT; 2487 if (tipc_msg_lookup_dest(net, skb, &err)) 2488 goto xmit; 2489 2490 /* Prepare for message rejection */ 2491 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2492 continue; 2493 2494 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2495 xmit: 2496 dnode = msg_destnode(buf_msg(skb)); 2497 tipc_node_xmit_skb(net, skb, dnode, dport); 2498 } 2499 } 2500 2501 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2502 { 2503 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2504 struct sock *sk = sock->sk; 2505 int done; 2506 2507 do { 2508 int err = sock_error(sk); 2509 if (err) 2510 return err; 2511 if (!*timeo_p) 2512 return -ETIMEDOUT; 2513 if (signal_pending(current)) 2514 return sock_intr_errno(*timeo_p); 2515 if (sk->sk_state == TIPC_DISCONNECTING) 2516 break; 2517 2518 add_wait_queue(sk_sleep(sk), &wait); 2519 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2520 &wait); 2521 remove_wait_queue(sk_sleep(sk), &wait); 2522 } while (!done); 2523 return 0; 2524 } 2525 2526 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2527 { 2528 if (addr->family != AF_TIPC) 2529 return false; 2530 if (addr->addrtype == TIPC_SERVICE_RANGE) 2531 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2532 return (addr->addrtype == TIPC_SERVICE_ADDR || 2533 addr->addrtype == TIPC_SOCKET_ADDR); 2534 } 2535 2536 /** 2537 * tipc_connect - establish a connection to another TIPC port 2538 * @sock: socket structure 2539 * @dest: socket address for destination port 2540 * @destlen: size of socket address data structure 2541 * @flags: file-related flags associated with socket 2542 * 2543 * Returns 0 on success, errno otherwise 2544 */ 2545 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2546 int destlen, int flags) 2547 { 2548 struct sock *sk = sock->sk; 2549 struct tipc_sock *tsk = tipc_sk(sk); 2550 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2551 struct msghdr m = {NULL,}; 2552 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2553 int previous; 2554 int res = 0; 2555 2556 if (destlen != sizeof(struct sockaddr_tipc)) 2557 return -EINVAL; 2558 2559 lock_sock(sk); 2560 2561 if (tsk->group) { 2562 res = -EINVAL; 2563 goto exit; 2564 } 2565 2566 if (dst->family == AF_UNSPEC) { 2567 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2568 if (!tipc_sk_type_connectionless(sk)) 2569 res = -EINVAL; 2570 goto exit; 2571 } 2572 if (!tipc_sockaddr_is_sane(dst)) { 2573 res = -EINVAL; 2574 goto exit; 2575 } 2576 /* DGRAM/RDM connect(), just save the destaddr */ 2577 if (tipc_sk_type_connectionless(sk)) { 2578 memcpy(&tsk->peer, dest, destlen); 2579 goto exit; 2580 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2581 res = -EINVAL; 2582 goto exit; 2583 } 2584 2585 previous = sk->sk_state; 2586 2587 switch (sk->sk_state) { 2588 case TIPC_OPEN: 2589 /* Send a 'SYN-' to destination */ 2590 m.msg_name = dest; 2591 m.msg_namelen = destlen; 2592 2593 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2594 * indicate send_msg() is never blocked. 2595 */ 2596 if (!timeout) 2597 m.msg_flags = MSG_DONTWAIT; 2598 2599 res = __tipc_sendmsg(sock, &m, 0); 2600 if ((res < 0) && (res != -EWOULDBLOCK)) 2601 goto exit; 2602 2603 /* Just entered TIPC_CONNECTING state; the only 2604 * difference is that return value in non-blocking 2605 * case is EINPROGRESS, rather than EALREADY. 2606 */ 2607 res = -EINPROGRESS; 2608 fallthrough; 2609 case TIPC_CONNECTING: 2610 if (!timeout) { 2611 if (previous == TIPC_CONNECTING) 2612 res = -EALREADY; 2613 goto exit; 2614 } 2615 timeout = msecs_to_jiffies(timeout); 2616 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2617 res = tipc_wait_for_connect(sock, &timeout); 2618 break; 2619 case TIPC_ESTABLISHED: 2620 res = -EISCONN; 2621 break; 2622 default: 2623 res = -EINVAL; 2624 } 2625 2626 exit: 2627 release_sock(sk); 2628 return res; 2629 } 2630 2631 /** 2632 * tipc_listen - allow socket to listen for incoming connections 2633 * @sock: socket structure 2634 * @len: (unused) 2635 * 2636 * Returns 0 on success, errno otherwise 2637 */ 2638 static int tipc_listen(struct socket *sock, int len) 2639 { 2640 struct sock *sk = sock->sk; 2641 int res; 2642 2643 lock_sock(sk); 2644 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2645 release_sock(sk); 2646 2647 return res; 2648 } 2649 2650 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2651 { 2652 struct sock *sk = sock->sk; 2653 DEFINE_WAIT(wait); 2654 int err; 2655 2656 /* True wake-one mechanism for incoming connections: only 2657 * one process gets woken up, not the 'whole herd'. 2658 * Since we do not 'race & poll' for established sockets 2659 * anymore, the common case will execute the loop only once. 2660 */ 2661 for (;;) { 2662 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 2663 TASK_INTERRUPTIBLE); 2664 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2665 release_sock(sk); 2666 timeo = schedule_timeout(timeo); 2667 lock_sock(sk); 2668 } 2669 err = 0; 2670 if (!skb_queue_empty(&sk->sk_receive_queue)) 2671 break; 2672 err = -EAGAIN; 2673 if (!timeo) 2674 break; 2675 err = sock_intr_errno(timeo); 2676 if (signal_pending(current)) 2677 break; 2678 } 2679 finish_wait(sk_sleep(sk), &wait); 2680 return err; 2681 } 2682 2683 /** 2684 * tipc_accept - wait for connection request 2685 * @sock: listening socket 2686 * @new_sock: new socket that is to be connected 2687 * @flags: file-related flags associated with socket 2688 * 2689 * Returns 0 on success, errno otherwise 2690 */ 2691 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2692 bool kern) 2693 { 2694 struct sock *new_sk, *sk = sock->sk; 2695 struct sk_buff *buf; 2696 struct tipc_sock *new_tsock; 2697 struct tipc_msg *msg; 2698 long timeo; 2699 int res; 2700 2701 lock_sock(sk); 2702 2703 if (sk->sk_state != TIPC_LISTEN) { 2704 res = -EINVAL; 2705 goto exit; 2706 } 2707 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2708 res = tipc_wait_for_accept(sock, timeo); 2709 if (res) 2710 goto exit; 2711 2712 buf = skb_peek(&sk->sk_receive_queue); 2713 2714 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2715 if (res) 2716 goto exit; 2717 security_sk_clone(sock->sk, new_sock->sk); 2718 2719 new_sk = new_sock->sk; 2720 new_tsock = tipc_sk(new_sk); 2721 msg = buf_msg(buf); 2722 2723 /* we lock on new_sk; but lockdep sees the lock on sk */ 2724 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2725 2726 /* 2727 * Reject any stray messages received by new socket 2728 * before the socket lock was taken (very, very unlikely) 2729 */ 2730 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2731 2732 /* Connect new socket to it's peer */ 2733 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2734 2735 tsk_set_importance(new_sk, msg_importance(msg)); 2736 if (msg_named(msg)) { 2737 new_tsock->conn_type = msg_nametype(msg); 2738 new_tsock->conn_instance = msg_nameinst(msg); 2739 } 2740 2741 /* 2742 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 2743 * Respond to 'SYN+' by queuing it on new socket. 2744 */ 2745 if (!msg_data_sz(msg)) { 2746 struct msghdr m = {NULL,}; 2747 2748 tsk_advance_rx_queue(sk); 2749 __tipc_sendstream(new_sock, &m, 0); 2750 } else { 2751 __skb_dequeue(&sk->sk_receive_queue); 2752 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2753 skb_set_owner_r(buf, new_sk); 2754 } 2755 release_sock(new_sk); 2756 exit: 2757 release_sock(sk); 2758 return res; 2759 } 2760 2761 /** 2762 * tipc_shutdown - shutdown socket connection 2763 * @sock: socket structure 2764 * @how: direction to close (must be SHUT_RDWR) 2765 * 2766 * Terminates connection (if necessary), then purges socket's receive queue. 2767 * 2768 * Returns 0 on success, errno otherwise 2769 */ 2770 static int tipc_shutdown(struct socket *sock, int how) 2771 { 2772 struct sock *sk = sock->sk; 2773 int res; 2774 2775 if (how != SHUT_RDWR) 2776 return -EINVAL; 2777 2778 lock_sock(sk); 2779 2780 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2781 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2782 sk->sk_shutdown = SHUTDOWN_MASK; 2783 2784 if (sk->sk_state == TIPC_DISCONNECTING) { 2785 /* Discard any unreceived messages */ 2786 __skb_queue_purge(&sk->sk_receive_queue); 2787 2788 res = 0; 2789 } else { 2790 res = -ENOTCONN; 2791 } 2792 /* Wake up anyone sleeping in poll. */ 2793 sk->sk_state_change(sk); 2794 2795 release_sock(sk); 2796 return res; 2797 } 2798 2799 static void tipc_sk_check_probing_state(struct sock *sk, 2800 struct sk_buff_head *list) 2801 { 2802 struct tipc_sock *tsk = tipc_sk(sk); 2803 u32 pnode = tsk_peer_node(tsk); 2804 u32 pport = tsk_peer_port(tsk); 2805 u32 self = tsk_own_node(tsk); 2806 u32 oport = tsk->portid; 2807 struct sk_buff *skb; 2808 2809 if (tsk->probe_unacked) { 2810 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2811 sk->sk_err = ECONNABORTED; 2812 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2813 sk->sk_state_change(sk); 2814 return; 2815 } 2816 /* Prepare new probe */ 2817 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2818 pnode, self, pport, oport, TIPC_OK); 2819 if (skb) 2820 __skb_queue_tail(list, skb); 2821 tsk->probe_unacked = true; 2822 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2823 } 2824 2825 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2826 { 2827 struct tipc_sock *tsk = tipc_sk(sk); 2828 2829 /* Try again later if dest link is congested */ 2830 if (tsk->cong_link_cnt) { 2831 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2832 return; 2833 } 2834 /* Prepare SYN for retransmit */ 2835 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2836 } 2837 2838 static void tipc_sk_timeout(struct timer_list *t) 2839 { 2840 struct sock *sk = from_timer(sk, t, sk_timer); 2841 struct tipc_sock *tsk = tipc_sk(sk); 2842 u32 pnode = tsk_peer_node(tsk); 2843 struct sk_buff_head list; 2844 int rc = 0; 2845 2846 __skb_queue_head_init(&list); 2847 bh_lock_sock(sk); 2848 2849 /* Try again later if socket is busy */ 2850 if (sock_owned_by_user(sk)) { 2851 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2852 bh_unlock_sock(sk); 2853 sock_put(sk); 2854 return; 2855 } 2856 2857 if (sk->sk_state == TIPC_ESTABLISHED) 2858 tipc_sk_check_probing_state(sk, &list); 2859 else if (sk->sk_state == TIPC_CONNECTING) 2860 tipc_sk_retry_connect(sk, &list); 2861 2862 bh_unlock_sock(sk); 2863 2864 if (!skb_queue_empty(&list)) 2865 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2866 2867 /* SYN messages may cause link congestion */ 2868 if (rc == -ELINKCONG) { 2869 tipc_dest_push(&tsk->cong_links, pnode, 0); 2870 tsk->cong_link_cnt = 1; 2871 } 2872 sock_put(sk); 2873 } 2874 2875 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, 2876 struct tipc_name_seq const *seq) 2877 { 2878 struct sock *sk = &tsk->sk; 2879 struct net *net = sock_net(sk); 2880 struct publication *publ; 2881 u32 key; 2882 2883 if (scope != TIPC_NODE_SCOPE) 2884 scope = TIPC_CLUSTER_SCOPE; 2885 2886 if (tipc_sk_connected(sk)) 2887 return -EINVAL; 2888 key = tsk->portid + tsk->pub_count + 1; 2889 if (key == tsk->portid) 2890 return -EADDRINUSE; 2891 2892 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper, 2893 scope, tsk->portid, key); 2894 if (unlikely(!publ)) 2895 return -EINVAL; 2896 2897 list_add(&publ->binding_sock, &tsk->publications); 2898 tsk->pub_count++; 2899 tsk->published = 1; 2900 return 0; 2901 } 2902 2903 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, 2904 struct tipc_name_seq const *seq) 2905 { 2906 struct net *net = sock_net(&tsk->sk); 2907 struct publication *publ; 2908 struct publication *safe; 2909 int rc = -EINVAL; 2910 2911 if (scope != TIPC_NODE_SCOPE) 2912 scope = TIPC_CLUSTER_SCOPE; 2913 2914 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) { 2915 if (seq) { 2916 if (publ->scope != scope) 2917 continue; 2918 if (publ->type != seq->type) 2919 continue; 2920 if (publ->lower != seq->lower) 2921 continue; 2922 if (publ->upper != seq->upper) 2923 break; 2924 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2925 publ->upper, publ->key); 2926 rc = 0; 2927 break; 2928 } 2929 tipc_nametbl_withdraw(net, publ->type, publ->lower, 2930 publ->upper, publ->key); 2931 rc = 0; 2932 } 2933 if (list_empty(&tsk->publications)) 2934 tsk->published = 0; 2935 return rc; 2936 } 2937 2938 /* tipc_sk_reinit: set non-zero address in all existing sockets 2939 * when we go from standalone to network mode. 2940 */ 2941 void tipc_sk_reinit(struct net *net) 2942 { 2943 struct tipc_net *tn = net_generic(net, tipc_net_id); 2944 struct rhashtable_iter iter; 2945 struct tipc_sock *tsk; 2946 struct tipc_msg *msg; 2947 2948 rhashtable_walk_enter(&tn->sk_rht, &iter); 2949 2950 do { 2951 rhashtable_walk_start(&iter); 2952 2953 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2954 sock_hold(&tsk->sk); 2955 rhashtable_walk_stop(&iter); 2956 lock_sock(&tsk->sk); 2957 msg = &tsk->phdr; 2958 msg_set_prevnode(msg, tipc_own_addr(net)); 2959 msg_set_orignode(msg, tipc_own_addr(net)); 2960 release_sock(&tsk->sk); 2961 rhashtable_walk_start(&iter); 2962 sock_put(&tsk->sk); 2963 } 2964 2965 rhashtable_walk_stop(&iter); 2966 } while (tsk == ERR_PTR(-EAGAIN)); 2967 2968 rhashtable_walk_exit(&iter); 2969 } 2970 2971 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2972 { 2973 struct tipc_net *tn = net_generic(net, tipc_net_id); 2974 struct tipc_sock *tsk; 2975 2976 rcu_read_lock(); 2977 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2978 if (tsk) 2979 sock_hold(&tsk->sk); 2980 rcu_read_unlock(); 2981 2982 return tsk; 2983 } 2984 2985 static int tipc_sk_insert(struct tipc_sock *tsk) 2986 { 2987 struct sock *sk = &tsk->sk; 2988 struct net *net = sock_net(sk); 2989 struct tipc_net *tn = net_generic(net, tipc_net_id); 2990 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 2991 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 2992 2993 while (remaining--) { 2994 portid++; 2995 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 2996 portid = TIPC_MIN_PORT; 2997 tsk->portid = portid; 2998 sock_hold(&tsk->sk); 2999 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 3000 tsk_rht_params)) 3001 return 0; 3002 sock_put(&tsk->sk); 3003 } 3004 3005 return -1; 3006 } 3007 3008 static void tipc_sk_remove(struct tipc_sock *tsk) 3009 { 3010 struct sock *sk = &tsk->sk; 3011 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3012 3013 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3014 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3015 __sock_put(sk); 3016 } 3017 } 3018 3019 static const struct rhashtable_params tsk_rht_params = { 3020 .nelem_hint = 192, 3021 .head_offset = offsetof(struct tipc_sock, node), 3022 .key_offset = offsetof(struct tipc_sock, portid), 3023 .key_len = sizeof(u32), /* portid */ 3024 .max_size = 1048576, 3025 .min_size = 256, 3026 .automatic_shrinking = true, 3027 }; 3028 3029 int tipc_sk_rht_init(struct net *net) 3030 { 3031 struct tipc_net *tn = net_generic(net, tipc_net_id); 3032 3033 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3034 } 3035 3036 void tipc_sk_rht_destroy(struct net *net) 3037 { 3038 struct tipc_net *tn = net_generic(net, tipc_net_id); 3039 3040 /* Wait for socket readers to complete */ 3041 synchronize_net(); 3042 3043 rhashtable_destroy(&tn->sk_rht); 3044 } 3045 3046 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3047 { 3048 struct net *net = sock_net(&tsk->sk); 3049 struct tipc_group *grp = tsk->group; 3050 struct tipc_msg *hdr = &tsk->phdr; 3051 struct tipc_name_seq seq; 3052 int rc; 3053 3054 if (mreq->type < TIPC_RESERVED_TYPES) 3055 return -EACCES; 3056 if (mreq->scope > TIPC_NODE_SCOPE) 3057 return -EINVAL; 3058 if (grp) 3059 return -EACCES; 3060 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3061 if (!grp) 3062 return -ENOMEM; 3063 tsk->group = grp; 3064 msg_set_lookup_scope(hdr, mreq->scope); 3065 msg_set_nametype(hdr, mreq->type); 3066 msg_set_dest_droppable(hdr, true); 3067 seq.type = mreq->type; 3068 seq.lower = mreq->instance; 3069 seq.upper = seq.lower; 3070 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope); 3071 rc = tipc_sk_publish(tsk, mreq->scope, &seq); 3072 if (rc) { 3073 tipc_group_delete(net, grp); 3074 tsk->group = NULL; 3075 return rc; 3076 } 3077 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3078 tsk->mc_method.rcast = true; 3079 tsk->mc_method.mandatory = true; 3080 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3081 return rc; 3082 } 3083 3084 static int tipc_sk_leave(struct tipc_sock *tsk) 3085 { 3086 struct net *net = sock_net(&tsk->sk); 3087 struct tipc_group *grp = tsk->group; 3088 struct tipc_name_seq seq; 3089 int scope; 3090 3091 if (!grp) 3092 return -EINVAL; 3093 tipc_group_self(grp, &seq, &scope); 3094 tipc_group_delete(net, grp); 3095 tsk->group = NULL; 3096 tipc_sk_withdraw(tsk, scope, &seq); 3097 return 0; 3098 } 3099 3100 /** 3101 * tipc_setsockopt - set socket option 3102 * @sock: socket structure 3103 * @lvl: option level 3104 * @opt: option identifier 3105 * @ov: pointer to new option value 3106 * @ol: length of option value 3107 * 3108 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3109 * (to ease compatibility). 3110 * 3111 * Returns 0 on success, errno otherwise 3112 */ 3113 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3114 sockptr_t ov, unsigned int ol) 3115 { 3116 struct sock *sk = sock->sk; 3117 struct tipc_sock *tsk = tipc_sk(sk); 3118 struct tipc_group_req mreq; 3119 u32 value = 0; 3120 int res = 0; 3121 3122 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3123 return 0; 3124 if (lvl != SOL_TIPC) 3125 return -ENOPROTOOPT; 3126 3127 switch (opt) { 3128 case TIPC_IMPORTANCE: 3129 case TIPC_SRC_DROPPABLE: 3130 case TIPC_DEST_DROPPABLE: 3131 case TIPC_CONN_TIMEOUT: 3132 case TIPC_NODELAY: 3133 if (ol < sizeof(value)) 3134 return -EINVAL; 3135 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3136 return -EFAULT; 3137 break; 3138 case TIPC_GROUP_JOIN: 3139 if (ol < sizeof(mreq)) 3140 return -EINVAL; 3141 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3142 return -EFAULT; 3143 break; 3144 default: 3145 if (!sockptr_is_null(ov) || ol) 3146 return -EINVAL; 3147 } 3148 3149 lock_sock(sk); 3150 3151 switch (opt) { 3152 case TIPC_IMPORTANCE: 3153 res = tsk_set_importance(sk, value); 3154 break; 3155 case TIPC_SRC_DROPPABLE: 3156 if (sock->type != SOCK_STREAM) 3157 tsk_set_unreliable(tsk, value); 3158 else 3159 res = -ENOPROTOOPT; 3160 break; 3161 case TIPC_DEST_DROPPABLE: 3162 tsk_set_unreturnable(tsk, value); 3163 break; 3164 case TIPC_CONN_TIMEOUT: 3165 tipc_sk(sk)->conn_timeout = value; 3166 break; 3167 case TIPC_MCAST_BROADCAST: 3168 tsk->mc_method.rcast = false; 3169 tsk->mc_method.mandatory = true; 3170 break; 3171 case TIPC_MCAST_REPLICAST: 3172 tsk->mc_method.rcast = true; 3173 tsk->mc_method.mandatory = true; 3174 break; 3175 case TIPC_GROUP_JOIN: 3176 res = tipc_sk_join(tsk, &mreq); 3177 break; 3178 case TIPC_GROUP_LEAVE: 3179 res = tipc_sk_leave(tsk); 3180 break; 3181 case TIPC_NODELAY: 3182 tsk->nodelay = !!value; 3183 tsk_set_nagle(tsk); 3184 break; 3185 default: 3186 res = -EINVAL; 3187 } 3188 3189 release_sock(sk); 3190 3191 return res; 3192 } 3193 3194 /** 3195 * tipc_getsockopt - get socket option 3196 * @sock: socket structure 3197 * @lvl: option level 3198 * @opt: option identifier 3199 * @ov: receptacle for option value 3200 * @ol: receptacle for length of option value 3201 * 3202 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3203 * (to ease compatibility). 3204 * 3205 * Returns 0 on success, errno otherwise 3206 */ 3207 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3208 char __user *ov, int __user *ol) 3209 { 3210 struct sock *sk = sock->sk; 3211 struct tipc_sock *tsk = tipc_sk(sk); 3212 struct tipc_name_seq seq; 3213 int len, scope; 3214 u32 value; 3215 int res; 3216 3217 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3218 return put_user(0, ol); 3219 if (lvl != SOL_TIPC) 3220 return -ENOPROTOOPT; 3221 res = get_user(len, ol); 3222 if (res) 3223 return res; 3224 3225 lock_sock(sk); 3226 3227 switch (opt) { 3228 case TIPC_IMPORTANCE: 3229 value = tsk_importance(tsk); 3230 break; 3231 case TIPC_SRC_DROPPABLE: 3232 value = tsk_unreliable(tsk); 3233 break; 3234 case TIPC_DEST_DROPPABLE: 3235 value = tsk_unreturnable(tsk); 3236 break; 3237 case TIPC_CONN_TIMEOUT: 3238 value = tsk->conn_timeout; 3239 /* no need to set "res", since already 0 at this point */ 3240 break; 3241 case TIPC_NODE_RECVQ_DEPTH: 3242 value = 0; /* was tipc_queue_size, now obsolete */ 3243 break; 3244 case TIPC_SOCK_RECVQ_DEPTH: 3245 value = skb_queue_len(&sk->sk_receive_queue); 3246 break; 3247 case TIPC_SOCK_RECVQ_USED: 3248 value = sk_rmem_alloc_get(sk); 3249 break; 3250 case TIPC_GROUP_JOIN: 3251 seq.type = 0; 3252 if (tsk->group) 3253 tipc_group_self(tsk->group, &seq, &scope); 3254 value = seq.type; 3255 break; 3256 default: 3257 res = -EINVAL; 3258 } 3259 3260 release_sock(sk); 3261 3262 if (res) 3263 return res; /* "get" failed */ 3264 3265 if (len < sizeof(value)) 3266 return -EINVAL; 3267 3268 if (copy_to_user(ov, &value, sizeof(value))) 3269 return -EFAULT; 3270 3271 return put_user(sizeof(value), ol); 3272 } 3273 3274 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3275 { 3276 struct net *net = sock_net(sock->sk); 3277 struct tipc_sioc_nodeid_req nr = {0}; 3278 struct tipc_sioc_ln_req lnr; 3279 void __user *argp = (void __user *)arg; 3280 3281 switch (cmd) { 3282 case SIOCGETLINKNAME: 3283 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3284 return -EFAULT; 3285 if (!tipc_node_get_linkname(net, 3286 lnr.bearer_id & 0xffff, lnr.peer, 3287 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3288 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3289 return -EFAULT; 3290 return 0; 3291 } 3292 return -EADDRNOTAVAIL; 3293 case SIOCGETNODEID: 3294 if (copy_from_user(&nr, argp, sizeof(nr))) 3295 return -EFAULT; 3296 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3297 return -EADDRNOTAVAIL; 3298 if (copy_to_user(argp, &nr, sizeof(nr))) 3299 return -EFAULT; 3300 return 0; 3301 default: 3302 return -ENOIOCTLCMD; 3303 } 3304 } 3305 3306 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3307 { 3308 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3309 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3310 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3311 3312 tsk1->peer.family = AF_TIPC; 3313 tsk1->peer.addrtype = TIPC_ADDR_ID; 3314 tsk1->peer.scope = TIPC_NODE_SCOPE; 3315 tsk1->peer.addr.id.ref = tsk2->portid; 3316 tsk1->peer.addr.id.node = onode; 3317 tsk2->peer.family = AF_TIPC; 3318 tsk2->peer.addrtype = TIPC_ADDR_ID; 3319 tsk2->peer.scope = TIPC_NODE_SCOPE; 3320 tsk2->peer.addr.id.ref = tsk1->portid; 3321 tsk2->peer.addr.id.node = onode; 3322 3323 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3324 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3325 return 0; 3326 } 3327 3328 /* Protocol switches for the various types of TIPC sockets */ 3329 3330 static const struct proto_ops msg_ops = { 3331 .owner = THIS_MODULE, 3332 .family = AF_TIPC, 3333 .release = tipc_release, 3334 .bind = tipc_bind, 3335 .connect = tipc_connect, 3336 .socketpair = tipc_socketpair, 3337 .accept = sock_no_accept, 3338 .getname = tipc_getname, 3339 .poll = tipc_poll, 3340 .ioctl = tipc_ioctl, 3341 .listen = sock_no_listen, 3342 .shutdown = tipc_shutdown, 3343 .setsockopt = tipc_setsockopt, 3344 .getsockopt = tipc_getsockopt, 3345 .sendmsg = tipc_sendmsg, 3346 .recvmsg = tipc_recvmsg, 3347 .mmap = sock_no_mmap, 3348 .sendpage = sock_no_sendpage 3349 }; 3350 3351 static const struct proto_ops packet_ops = { 3352 .owner = THIS_MODULE, 3353 .family = AF_TIPC, 3354 .release = tipc_release, 3355 .bind = tipc_bind, 3356 .connect = tipc_connect, 3357 .socketpair = tipc_socketpair, 3358 .accept = tipc_accept, 3359 .getname = tipc_getname, 3360 .poll = tipc_poll, 3361 .ioctl = tipc_ioctl, 3362 .listen = tipc_listen, 3363 .shutdown = tipc_shutdown, 3364 .setsockopt = tipc_setsockopt, 3365 .getsockopt = tipc_getsockopt, 3366 .sendmsg = tipc_send_packet, 3367 .recvmsg = tipc_recvmsg, 3368 .mmap = sock_no_mmap, 3369 .sendpage = sock_no_sendpage 3370 }; 3371 3372 static const struct proto_ops stream_ops = { 3373 .owner = THIS_MODULE, 3374 .family = AF_TIPC, 3375 .release = tipc_release, 3376 .bind = tipc_bind, 3377 .connect = tipc_connect, 3378 .socketpair = tipc_socketpair, 3379 .accept = tipc_accept, 3380 .getname = tipc_getname, 3381 .poll = tipc_poll, 3382 .ioctl = tipc_ioctl, 3383 .listen = tipc_listen, 3384 .shutdown = tipc_shutdown, 3385 .setsockopt = tipc_setsockopt, 3386 .getsockopt = tipc_getsockopt, 3387 .sendmsg = tipc_sendstream, 3388 .recvmsg = tipc_recvstream, 3389 .mmap = sock_no_mmap, 3390 .sendpage = sock_no_sendpage 3391 }; 3392 3393 static const struct net_proto_family tipc_family_ops = { 3394 .owner = THIS_MODULE, 3395 .family = AF_TIPC, 3396 .create = tipc_sk_create 3397 }; 3398 3399 static struct proto tipc_proto = { 3400 .name = "TIPC", 3401 .owner = THIS_MODULE, 3402 .obj_size = sizeof(struct tipc_sock), 3403 .sysctl_rmem = sysctl_tipc_rmem 3404 }; 3405 3406 /** 3407 * tipc_socket_init - initialize TIPC socket interface 3408 * 3409 * Returns 0 on success, errno otherwise 3410 */ 3411 int tipc_socket_init(void) 3412 { 3413 int res; 3414 3415 res = proto_register(&tipc_proto, 1); 3416 if (res) { 3417 pr_err("Failed to register TIPC protocol type\n"); 3418 goto out; 3419 } 3420 3421 res = sock_register(&tipc_family_ops); 3422 if (res) { 3423 pr_err("Failed to register TIPC socket type\n"); 3424 proto_unregister(&tipc_proto); 3425 goto out; 3426 } 3427 out: 3428 return res; 3429 } 3430 3431 /** 3432 * tipc_socket_stop - stop TIPC socket interface 3433 */ 3434 void tipc_socket_stop(void) 3435 { 3436 sock_unregister(tipc_family_ops.family); 3437 proto_unregister(&tipc_proto); 3438 } 3439 3440 /* Caller should hold socket lock for the passed tipc socket. */ 3441 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3442 { 3443 u32 peer_node; 3444 u32 peer_port; 3445 struct nlattr *nest; 3446 3447 peer_node = tsk_peer_node(tsk); 3448 peer_port = tsk_peer_port(tsk); 3449 3450 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3451 if (!nest) 3452 return -EMSGSIZE; 3453 3454 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3455 goto msg_full; 3456 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3457 goto msg_full; 3458 3459 if (tsk->conn_type != 0) { 3460 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3461 goto msg_full; 3462 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) 3463 goto msg_full; 3464 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) 3465 goto msg_full; 3466 } 3467 nla_nest_end(skb, nest); 3468 3469 return 0; 3470 3471 msg_full: 3472 nla_nest_cancel(skb, nest); 3473 3474 return -EMSGSIZE; 3475 } 3476 3477 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3478 *tsk) 3479 { 3480 struct net *net = sock_net(skb->sk); 3481 struct sock *sk = &tsk->sk; 3482 3483 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3484 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3485 return -EMSGSIZE; 3486 3487 if (tipc_sk_connected(sk)) { 3488 if (__tipc_nl_add_sk_con(skb, tsk)) 3489 return -EMSGSIZE; 3490 } else if (!list_empty(&tsk->publications)) { 3491 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3492 return -EMSGSIZE; 3493 } 3494 return 0; 3495 } 3496 3497 /* Caller should hold socket lock for the passed tipc socket. */ 3498 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3499 struct tipc_sock *tsk) 3500 { 3501 struct nlattr *attrs; 3502 void *hdr; 3503 3504 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3505 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3506 if (!hdr) 3507 goto msg_cancel; 3508 3509 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3510 if (!attrs) 3511 goto genlmsg_cancel; 3512 3513 if (__tipc_nl_add_sk_info(skb, tsk)) 3514 goto attr_msg_cancel; 3515 3516 nla_nest_end(skb, attrs); 3517 genlmsg_end(skb, hdr); 3518 3519 return 0; 3520 3521 attr_msg_cancel: 3522 nla_nest_cancel(skb, attrs); 3523 genlmsg_cancel: 3524 genlmsg_cancel(skb, hdr); 3525 msg_cancel: 3526 return -EMSGSIZE; 3527 } 3528 3529 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3530 int (*skb_handler)(struct sk_buff *skb, 3531 struct netlink_callback *cb, 3532 struct tipc_sock *tsk)) 3533 { 3534 struct rhashtable_iter *iter = (void *)cb->args[4]; 3535 struct tipc_sock *tsk; 3536 int err; 3537 3538 rhashtable_walk_start(iter); 3539 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3540 if (IS_ERR(tsk)) { 3541 err = PTR_ERR(tsk); 3542 if (err == -EAGAIN) { 3543 err = 0; 3544 continue; 3545 } 3546 break; 3547 } 3548 3549 sock_hold(&tsk->sk); 3550 rhashtable_walk_stop(iter); 3551 lock_sock(&tsk->sk); 3552 err = skb_handler(skb, cb, tsk); 3553 if (err) { 3554 release_sock(&tsk->sk); 3555 sock_put(&tsk->sk); 3556 goto out; 3557 } 3558 release_sock(&tsk->sk); 3559 rhashtable_walk_start(iter); 3560 sock_put(&tsk->sk); 3561 } 3562 rhashtable_walk_stop(iter); 3563 out: 3564 return skb->len; 3565 } 3566 EXPORT_SYMBOL(tipc_nl_sk_walk); 3567 3568 int tipc_dump_start(struct netlink_callback *cb) 3569 { 3570 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3571 } 3572 EXPORT_SYMBOL(tipc_dump_start); 3573 3574 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3575 { 3576 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3577 struct rhashtable_iter *iter = (void *)cb->args[4]; 3578 struct tipc_net *tn = tipc_net(net); 3579 3580 if (!iter) { 3581 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3582 if (!iter) 3583 return -ENOMEM; 3584 3585 cb->args[4] = (long)iter; 3586 } 3587 3588 rhashtable_walk_enter(&tn->sk_rht, iter); 3589 return 0; 3590 } 3591 3592 int tipc_dump_done(struct netlink_callback *cb) 3593 { 3594 struct rhashtable_iter *hti = (void *)cb->args[4]; 3595 3596 rhashtable_walk_exit(hti); 3597 kfree(hti); 3598 return 0; 3599 } 3600 EXPORT_SYMBOL(tipc_dump_done); 3601 3602 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3603 struct tipc_sock *tsk, u32 sk_filter_state, 3604 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3605 { 3606 struct sock *sk = &tsk->sk; 3607 struct nlattr *attrs; 3608 struct nlattr *stat; 3609 3610 /*filter response w.r.t sk_state*/ 3611 if (!(sk_filter_state & (1 << sk->sk_state))) 3612 return 0; 3613 3614 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3615 if (!attrs) 3616 goto msg_cancel; 3617 3618 if (__tipc_nl_add_sk_info(skb, tsk)) 3619 goto attr_msg_cancel; 3620 3621 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3622 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3623 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3624 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3625 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3626 sock_i_uid(sk))) || 3627 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3628 tipc_diag_gen_cookie(sk), 3629 TIPC_NLA_SOCK_PAD)) 3630 goto attr_msg_cancel; 3631 3632 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3633 if (!stat) 3634 goto attr_msg_cancel; 3635 3636 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3637 skb_queue_len(&sk->sk_receive_queue)) || 3638 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3639 skb_queue_len(&sk->sk_write_queue)) || 3640 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3641 atomic_read(&sk->sk_drops))) 3642 goto stat_msg_cancel; 3643 3644 if (tsk->cong_link_cnt && 3645 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3646 goto stat_msg_cancel; 3647 3648 if (tsk_conn_cong(tsk) && 3649 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3650 goto stat_msg_cancel; 3651 3652 nla_nest_end(skb, stat); 3653 3654 if (tsk->group) 3655 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3656 goto stat_msg_cancel; 3657 3658 nla_nest_end(skb, attrs); 3659 3660 return 0; 3661 3662 stat_msg_cancel: 3663 nla_nest_cancel(skb, stat); 3664 attr_msg_cancel: 3665 nla_nest_cancel(skb, attrs); 3666 msg_cancel: 3667 return -EMSGSIZE; 3668 } 3669 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3670 3671 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3672 { 3673 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3674 } 3675 3676 /* Caller should hold socket lock for the passed tipc socket. */ 3677 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3678 struct netlink_callback *cb, 3679 struct publication *publ) 3680 { 3681 void *hdr; 3682 struct nlattr *attrs; 3683 3684 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3685 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3686 if (!hdr) 3687 goto msg_cancel; 3688 3689 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3690 if (!attrs) 3691 goto genlmsg_cancel; 3692 3693 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3694 goto attr_msg_cancel; 3695 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) 3696 goto attr_msg_cancel; 3697 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) 3698 goto attr_msg_cancel; 3699 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) 3700 goto attr_msg_cancel; 3701 3702 nla_nest_end(skb, attrs); 3703 genlmsg_end(skb, hdr); 3704 3705 return 0; 3706 3707 attr_msg_cancel: 3708 nla_nest_cancel(skb, attrs); 3709 genlmsg_cancel: 3710 genlmsg_cancel(skb, hdr); 3711 msg_cancel: 3712 return -EMSGSIZE; 3713 } 3714 3715 /* Caller should hold socket lock for the passed tipc socket. */ 3716 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3717 struct netlink_callback *cb, 3718 struct tipc_sock *tsk, u32 *last_publ) 3719 { 3720 int err; 3721 struct publication *p; 3722 3723 if (*last_publ) { 3724 list_for_each_entry(p, &tsk->publications, binding_sock) { 3725 if (p->key == *last_publ) 3726 break; 3727 } 3728 if (p->key != *last_publ) { 3729 /* We never set seq or call nl_dump_check_consistent() 3730 * this means that setting prev_seq here will cause the 3731 * consistence check to fail in the netlink callback 3732 * handler. Resulting in the last NLMSG_DONE message 3733 * having the NLM_F_DUMP_INTR flag set. 3734 */ 3735 cb->prev_seq = 1; 3736 *last_publ = 0; 3737 return -EPIPE; 3738 } 3739 } else { 3740 p = list_first_entry(&tsk->publications, struct publication, 3741 binding_sock); 3742 } 3743 3744 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3745 err = __tipc_nl_add_sk_publ(skb, cb, p); 3746 if (err) { 3747 *last_publ = p->key; 3748 return err; 3749 } 3750 } 3751 *last_publ = 0; 3752 3753 return 0; 3754 } 3755 3756 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3757 { 3758 int err; 3759 u32 tsk_portid = cb->args[0]; 3760 u32 last_publ = cb->args[1]; 3761 u32 done = cb->args[2]; 3762 struct net *net = sock_net(skb->sk); 3763 struct tipc_sock *tsk; 3764 3765 if (!tsk_portid) { 3766 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3767 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3768 3769 if (!attrs[TIPC_NLA_SOCK]) 3770 return -EINVAL; 3771 3772 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3773 attrs[TIPC_NLA_SOCK], 3774 tipc_nl_sock_policy, NULL); 3775 if (err) 3776 return err; 3777 3778 if (!sock[TIPC_NLA_SOCK_REF]) 3779 return -EINVAL; 3780 3781 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3782 } 3783 3784 if (done) 3785 return 0; 3786 3787 tsk = tipc_sk_lookup(net, tsk_portid); 3788 if (!tsk) 3789 return -EINVAL; 3790 3791 lock_sock(&tsk->sk); 3792 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3793 if (!err) 3794 done = 1; 3795 release_sock(&tsk->sk); 3796 sock_put(&tsk->sk); 3797 3798 cb->args[0] = tsk_portid; 3799 cb->args[1] = last_publ; 3800 cb->args[2] = done; 3801 3802 return skb->len; 3803 } 3804 3805 /** 3806 * tipc_sk_filtering - check if a socket should be traced 3807 * @sk: the socket to be examined 3808 * @sysctl_tipc_sk_filter[]: the socket tuple for filtering, 3809 * (portid, sock type, name type, name lower, name upper) 3810 * 3811 * Returns true if the socket meets the socket tuple data 3812 * (value 0 = 'any') or when there is no tuple set (all = 0), 3813 * otherwise false 3814 */ 3815 bool tipc_sk_filtering(struct sock *sk) 3816 { 3817 struct tipc_sock *tsk; 3818 struct publication *p; 3819 u32 _port, _sktype, _type, _lower, _upper; 3820 u32 type = 0, lower = 0, upper = 0; 3821 3822 if (!sk) 3823 return true; 3824 3825 tsk = tipc_sk(sk); 3826 3827 _port = sysctl_tipc_sk_filter[0]; 3828 _sktype = sysctl_tipc_sk_filter[1]; 3829 _type = sysctl_tipc_sk_filter[2]; 3830 _lower = sysctl_tipc_sk_filter[3]; 3831 _upper = sysctl_tipc_sk_filter[4]; 3832 3833 if (!_port && !_sktype && !_type && !_lower && !_upper) 3834 return true; 3835 3836 if (_port) 3837 return (_port == tsk->portid); 3838 3839 if (_sktype && _sktype != sk->sk_type) 3840 return false; 3841 3842 if (tsk->published) { 3843 p = list_first_entry_or_null(&tsk->publications, 3844 struct publication, binding_sock); 3845 if (p) { 3846 type = p->type; 3847 lower = p->lower; 3848 upper = p->upper; 3849 } 3850 } 3851 3852 if (!tipc_sk_type_connectionless(sk)) { 3853 type = tsk->conn_type; 3854 lower = tsk->conn_instance; 3855 upper = tsk->conn_instance; 3856 } 3857 3858 if ((_type && _type != type) || (_lower && _lower != lower) || 3859 (_upper && _upper != upper)) 3860 return false; 3861 3862 return true; 3863 } 3864 3865 u32 tipc_sock_get_portid(struct sock *sk) 3866 { 3867 return (sk) ? (tipc_sk(sk))->portid : 0; 3868 } 3869 3870 /** 3871 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3872 * both the rcv and backlog queues are considered 3873 * @sk: tipc sk to be checked 3874 * @skb: tipc msg to be checked 3875 * 3876 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3877 */ 3878 3879 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3880 { 3881 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3882 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3883 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3884 3885 return (qsize > lim * 90 / 100); 3886 } 3887 3888 /** 3889 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3890 * only the rcv queue is considered 3891 * @sk: tipc sk to be checked 3892 * @skb: tipc msg to be checked 3893 * 3894 * Returns true if the socket rx queue allocation is > 90%, otherwise false 3895 */ 3896 3897 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3898 { 3899 unsigned int lim = rcvbuf_limit(sk, skb); 3900 unsigned int qsize = sk_rmem_alloc_get(sk); 3901 3902 return (qsize > lim * 90 / 100); 3903 } 3904 3905 /** 3906 * tipc_sk_dump - dump TIPC socket 3907 * @sk: tipc sk to be dumped 3908 * @dqueues: bitmask to decide if any socket queue to be dumped? 3909 * - TIPC_DUMP_NONE: don't dump socket queues 3910 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3911 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3912 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3913 * - TIPC_DUMP_ALL: dump all the socket queues above 3914 * @buf: returned buffer of dump data in format 3915 */ 3916 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3917 { 3918 int i = 0; 3919 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3920 struct tipc_sock *tsk; 3921 struct publication *p; 3922 bool tsk_connected; 3923 3924 if (!sk) { 3925 i += scnprintf(buf, sz, "sk data: (null)\n"); 3926 return i; 3927 } 3928 3929 tsk = tipc_sk(sk); 3930 tsk_connected = !tipc_sk_type_connectionless(sk); 3931 3932 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3933 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3934 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3935 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3936 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3937 if (tsk_connected) { 3938 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3939 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3940 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type); 3941 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance); 3942 } 3943 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3944 if (tsk->published) { 3945 p = list_first_entry_or_null(&tsk->publications, 3946 struct publication, binding_sock); 3947 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0); 3948 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0); 3949 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0); 3950 } 3951 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3952 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3953 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3954 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3955 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3956 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3957 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3958 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3959 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3960 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3961 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3962 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3963 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3964 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3965 3966 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3967 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3968 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3969 } 3970 3971 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3972 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3973 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3974 } 3975 3976 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 3977 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 3978 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 3979 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 3980 i += scnprintf(buf + i, sz - i, " tail "); 3981 i += tipc_skb_dump(sk->sk_backlog.tail, false, 3982 buf + i); 3983 } 3984 } 3985 3986 return i; 3987 } 3988