1 /* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2007, 2012-2019, Ericsson AB 5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems 6 * Copyright (c) 2020-2021, Red Hat Inc 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the names of the copyright holders nor the names of its 18 * contributors may be used to endorse or promote products derived from 19 * this software without specific prior written permission. 20 * 21 * Alternatively, this software may be distributed under the terms of the 22 * GNU General Public License ("GPL") version 2 as published by the Free 23 * Software Foundation. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/rhashtable.h> 39 #include <linux/sched/signal.h> 40 41 #include "core.h" 42 #include "name_table.h" 43 #include "node.h" 44 #include "link.h" 45 #include "name_distr.h" 46 #include "socket.h" 47 #include "bcast.h" 48 #include "netlink.h" 49 #include "group.h" 50 #include "trace.h" 51 52 #define NAGLE_START_INIT 4 53 #define NAGLE_START_MAX 1024 54 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 55 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 56 #define TIPC_MAX_PORT 0xffffffff 57 #define TIPC_MIN_PORT 1 58 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */ 59 60 enum { 61 TIPC_LISTEN = TCP_LISTEN, 62 TIPC_ESTABLISHED = TCP_ESTABLISHED, 63 TIPC_OPEN = TCP_CLOSE, 64 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 65 TIPC_CONNECTING = TCP_SYN_SENT, 66 }; 67 68 struct sockaddr_pair { 69 struct sockaddr_tipc sock; 70 struct sockaddr_tipc member; 71 }; 72 73 /** 74 * struct tipc_sock - TIPC socket structure 75 * @sk: socket - interacts with 'port' and with user via the socket API 76 * @max_pkt: maximum packet size "hint" used when building messages sent by port 77 * @maxnagle: maximum size of msg which can be subject to nagle 78 * @portid: unique port identity in TIPC socket hash table 79 * @phdr: preformatted message header used when sending messages 80 * @cong_links: list of congested links 81 * @publications: list of publications for port 82 * @blocking_link: address of the congested link we are currently sleeping on 83 * @pub_count: total # of publications port has made during its lifetime 84 * @conn_timeout: the time we can wait for an unresponded setup request 85 * @probe_unacked: probe has not received ack yet 86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 87 * @cong_link_cnt: number of congested links 88 * @snt_unacked: # messages sent by socket, and not yet acked by peer 89 * @snd_win: send window size 90 * @peer_caps: peer capabilities mask 91 * @rcv_unacked: # messages read by user, but not yet acked back to peer 92 * @rcv_win: receive window size 93 * @peer: 'connected' peer for dgram/rdm 94 * @node: hash table node 95 * @mc_method: cookie for use between socket and broadcast layer 96 * @rcu: rcu struct for tipc_sock 97 * @group: TIPC communications group 98 * @oneway: message count in one direction (FIXME) 99 * @nagle_start: current nagle value 100 * @snd_backlog: send backlog count 101 * @msg_acc: messages accepted; used in managing backlog and nagle 102 * @pkt_cnt: TIPC socket packet count 103 * @expect_ack: whether this TIPC socket is expecting an ack 104 * @nodelay: setsockopt() TIPC_NODELAY setting 105 * @group_is_open: TIPC socket group is fully open (FIXME) 106 * @published: true if port has one or more associated names 107 * @conn_addrtype: address type used when establishing connection 108 */ 109 struct tipc_sock { 110 struct sock sk; 111 u32 max_pkt; 112 u32 maxnagle; 113 u32 portid; 114 struct tipc_msg phdr; 115 struct list_head cong_links; 116 struct list_head publications; 117 u32 pub_count; 118 atomic_t dupl_rcvcnt; 119 u16 conn_timeout; 120 bool probe_unacked; 121 u16 cong_link_cnt; 122 u16 snt_unacked; 123 u16 snd_win; 124 u16 peer_caps; 125 u16 rcv_unacked; 126 u16 rcv_win; 127 struct sockaddr_tipc peer; 128 struct rhash_head node; 129 struct tipc_mc_method mc_method; 130 struct rcu_head rcu; 131 struct tipc_group *group; 132 u32 oneway; 133 u32 nagle_start; 134 u16 snd_backlog; 135 u16 msg_acc; 136 u16 pkt_cnt; 137 bool expect_ack; 138 bool nodelay; 139 bool group_is_open; 140 bool published; 141 u8 conn_addrtype; 142 }; 143 144 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 145 static void tipc_data_ready(struct sock *sk); 146 static void tipc_write_space(struct sock *sk); 147 static void tipc_sock_destruct(struct sock *sk); 148 static int tipc_release(struct socket *sock); 149 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 150 bool kern); 151 static void tipc_sk_timeout(struct timer_list *t); 152 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua); 153 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua); 154 static int tipc_sk_leave(struct tipc_sock *tsk); 155 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 156 static int tipc_sk_insert(struct tipc_sock *tsk); 157 static void tipc_sk_remove(struct tipc_sock *tsk); 158 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 159 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 160 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 161 162 static const struct proto_ops packet_ops; 163 static const struct proto_ops stream_ops; 164 static const struct proto_ops msg_ops; 165 static struct proto tipc_proto; 166 static const struct rhashtable_params tsk_rht_params; 167 168 static u32 tsk_own_node(struct tipc_sock *tsk) 169 { 170 return msg_prevnode(&tsk->phdr); 171 } 172 173 static u32 tsk_peer_node(struct tipc_sock *tsk) 174 { 175 return msg_destnode(&tsk->phdr); 176 } 177 178 static u32 tsk_peer_port(struct tipc_sock *tsk) 179 { 180 return msg_destport(&tsk->phdr); 181 } 182 183 static bool tsk_unreliable(struct tipc_sock *tsk) 184 { 185 return msg_src_droppable(&tsk->phdr) != 0; 186 } 187 188 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 189 { 190 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 191 } 192 193 static bool tsk_unreturnable(struct tipc_sock *tsk) 194 { 195 return msg_dest_droppable(&tsk->phdr) != 0; 196 } 197 198 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 199 { 200 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 201 } 202 203 static int tsk_importance(struct tipc_sock *tsk) 204 { 205 return msg_importance(&tsk->phdr); 206 } 207 208 static struct tipc_sock *tipc_sk(const struct sock *sk) 209 { 210 return container_of(sk, struct tipc_sock, sk); 211 } 212 213 int tsk_set_importance(struct sock *sk, int imp) 214 { 215 if (imp > TIPC_CRITICAL_IMPORTANCE) 216 return -EINVAL; 217 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 218 return 0; 219 } 220 221 static bool tsk_conn_cong(struct tipc_sock *tsk) 222 { 223 return tsk->snt_unacked > tsk->snd_win; 224 } 225 226 static u16 tsk_blocks(int len) 227 { 228 return ((len / FLOWCTL_BLK_SZ) + 1); 229 } 230 231 /* tsk_blocks(): translate a buffer size in bytes to number of 232 * advertisable blocks, taking into account the ratio truesize(len)/len 233 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 234 */ 235 static u16 tsk_adv_blocks(int len) 236 { 237 return len / FLOWCTL_BLK_SZ / 4; 238 } 239 240 /* tsk_inc(): increment counter for sent or received data 241 * - If block based flow control is not supported by peer we 242 * fall back to message based ditto, incrementing the counter 243 */ 244 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 245 { 246 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 247 return ((msglen / FLOWCTL_BLK_SZ) + 1); 248 return 1; 249 } 250 251 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 252 */ 253 static void tsk_set_nagle(struct tipc_sock *tsk) 254 { 255 struct sock *sk = &tsk->sk; 256 257 tsk->maxnagle = 0; 258 if (sk->sk_type != SOCK_STREAM) 259 return; 260 if (tsk->nodelay) 261 return; 262 if (!(tsk->peer_caps & TIPC_NAGLE)) 263 return; 264 /* Limit node local buffer size to avoid receive queue overflow */ 265 if (tsk->max_pkt == MAX_MSG_SIZE) 266 tsk->maxnagle = 1500; 267 else 268 tsk->maxnagle = tsk->max_pkt; 269 } 270 271 /** 272 * tsk_advance_rx_queue - discard first buffer in socket receive queue 273 * @sk: network socket 274 * 275 * Caller must hold socket lock 276 */ 277 static void tsk_advance_rx_queue(struct sock *sk) 278 { 279 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 280 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 281 } 282 283 /* tipc_sk_respond() : send response message back to sender 284 */ 285 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 286 { 287 u32 selector; 288 u32 dnode; 289 u32 onode = tipc_own_addr(sock_net(sk)); 290 291 if (!tipc_msg_reverse(onode, &skb, err)) 292 return; 293 294 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 295 dnode = msg_destnode(buf_msg(skb)); 296 selector = msg_origport(buf_msg(skb)); 297 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 298 } 299 300 /** 301 * tsk_rej_rx_queue - reject all buffers in socket receive queue 302 * @sk: network socket 303 * @error: response error code 304 * 305 * Caller must hold socket lock 306 */ 307 static void tsk_rej_rx_queue(struct sock *sk, int error) 308 { 309 struct sk_buff *skb; 310 311 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 312 tipc_sk_respond(sk, skb, error); 313 } 314 315 static bool tipc_sk_connected(struct sock *sk) 316 { 317 return sk->sk_state == TIPC_ESTABLISHED; 318 } 319 320 /* tipc_sk_type_connectionless - check if the socket is datagram socket 321 * @sk: socket 322 * 323 * Returns true if connection less, false otherwise 324 */ 325 static bool tipc_sk_type_connectionless(struct sock *sk) 326 { 327 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 328 } 329 330 /* tsk_peer_msg - verify if message was sent by connected port's peer 331 * 332 * Handles cases where the node's network address has changed from 333 * the default of <0.0.0> to its configured setting. 334 */ 335 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 336 { 337 struct sock *sk = &tsk->sk; 338 u32 self = tipc_own_addr(sock_net(sk)); 339 u32 peer_port = tsk_peer_port(tsk); 340 u32 orig_node, peer_node; 341 342 if (unlikely(!tipc_sk_connected(sk))) 343 return false; 344 345 if (unlikely(msg_origport(msg) != peer_port)) 346 return false; 347 348 orig_node = msg_orignode(msg); 349 peer_node = tsk_peer_node(tsk); 350 351 if (likely(orig_node == peer_node)) 352 return true; 353 354 if (!orig_node && peer_node == self) 355 return true; 356 357 if (!peer_node && orig_node == self) 358 return true; 359 360 return false; 361 } 362 363 /* tipc_set_sk_state - set the sk_state of the socket 364 * @sk: socket 365 * 366 * Caller must hold socket lock 367 * 368 * Returns 0 on success, errno otherwise 369 */ 370 static int tipc_set_sk_state(struct sock *sk, int state) 371 { 372 int oldsk_state = sk->sk_state; 373 int res = -EINVAL; 374 375 switch (state) { 376 case TIPC_OPEN: 377 res = 0; 378 break; 379 case TIPC_LISTEN: 380 case TIPC_CONNECTING: 381 if (oldsk_state == TIPC_OPEN) 382 res = 0; 383 break; 384 case TIPC_ESTABLISHED: 385 if (oldsk_state == TIPC_CONNECTING || 386 oldsk_state == TIPC_OPEN) 387 res = 0; 388 break; 389 case TIPC_DISCONNECTING: 390 if (oldsk_state == TIPC_CONNECTING || 391 oldsk_state == TIPC_ESTABLISHED) 392 res = 0; 393 break; 394 } 395 396 if (!res) 397 sk->sk_state = state; 398 399 return res; 400 } 401 402 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 403 { 404 struct sock *sk = sock->sk; 405 int err = sock_error(sk); 406 int typ = sock->type; 407 408 if (err) 409 return err; 410 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 411 if (sk->sk_state == TIPC_DISCONNECTING) 412 return -EPIPE; 413 else if (!tipc_sk_connected(sk)) 414 return -ENOTCONN; 415 } 416 if (!*timeout) 417 return -EAGAIN; 418 if (signal_pending(current)) 419 return sock_intr_errno(*timeout); 420 421 return 0; 422 } 423 424 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 425 ({ \ 426 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 427 struct sock *sk_; \ 428 int rc_; \ 429 \ 430 while ((rc_ = !(condition_))) { \ 431 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 432 smp_rmb(); \ 433 sk_ = (sock_)->sk; \ 434 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 435 if (rc_) \ 436 break; \ 437 add_wait_queue(sk_sleep(sk_), &wait_); \ 438 release_sock(sk_); \ 439 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 440 sched_annotate_sleep(); \ 441 lock_sock(sk_); \ 442 remove_wait_queue(sk_sleep(sk_), &wait_); \ 443 } \ 444 rc_; \ 445 }) 446 447 /** 448 * tipc_sk_create - create a TIPC socket 449 * @net: network namespace (must be default network) 450 * @sock: pre-allocated socket structure 451 * @protocol: protocol indicator (must be 0) 452 * @kern: caused by kernel or by userspace? 453 * 454 * This routine creates additional data structures used by the TIPC socket, 455 * initializes them, and links them together. 456 * 457 * Return: 0 on success, errno otherwise 458 */ 459 static int tipc_sk_create(struct net *net, struct socket *sock, 460 int protocol, int kern) 461 { 462 const struct proto_ops *ops; 463 struct sock *sk; 464 struct tipc_sock *tsk; 465 struct tipc_msg *msg; 466 467 /* Validate arguments */ 468 if (unlikely(protocol != 0)) 469 return -EPROTONOSUPPORT; 470 471 switch (sock->type) { 472 case SOCK_STREAM: 473 ops = &stream_ops; 474 break; 475 case SOCK_SEQPACKET: 476 ops = &packet_ops; 477 break; 478 case SOCK_DGRAM: 479 case SOCK_RDM: 480 ops = &msg_ops; 481 break; 482 default: 483 return -EPROTOTYPE; 484 } 485 486 /* Allocate socket's protocol area */ 487 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 488 if (sk == NULL) 489 return -ENOMEM; 490 491 tsk = tipc_sk(sk); 492 tsk->max_pkt = MAX_PKT_DEFAULT; 493 tsk->maxnagle = 0; 494 tsk->nagle_start = NAGLE_START_INIT; 495 INIT_LIST_HEAD(&tsk->publications); 496 INIT_LIST_HEAD(&tsk->cong_links); 497 msg = &tsk->phdr; 498 499 /* Finish initializing socket data structures */ 500 sock->ops = ops; 501 sock_init_data(sock, sk); 502 tipc_set_sk_state(sk, TIPC_OPEN); 503 if (tipc_sk_insert(tsk)) { 504 pr_warn("Socket create failed; port number exhausted\n"); 505 return -EINVAL; 506 } 507 508 /* Ensure tsk is visible before we read own_addr. */ 509 smp_mb(); 510 511 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 512 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 513 514 msg_set_origport(msg, tsk->portid); 515 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 516 sk->sk_shutdown = 0; 517 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 518 sk->sk_rcvbuf = sysctl_tipc_rmem[1]; 519 sk->sk_data_ready = tipc_data_ready; 520 sk->sk_write_space = tipc_write_space; 521 sk->sk_destruct = tipc_sock_destruct; 522 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 523 tsk->group_is_open = true; 524 atomic_set(&tsk->dupl_rcvcnt, 0); 525 526 /* Start out with safe limits until we receive an advertised window */ 527 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 528 tsk->rcv_win = tsk->snd_win; 529 530 if (tipc_sk_type_connectionless(sk)) { 531 tsk_set_unreturnable(tsk, true); 532 if (sock->type == SOCK_DGRAM) 533 tsk_set_unreliable(tsk, true); 534 } 535 __skb_queue_head_init(&tsk->mc_method.deferredq); 536 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 537 return 0; 538 } 539 540 static void tipc_sk_callback(struct rcu_head *head) 541 { 542 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 543 544 sock_put(&tsk->sk); 545 } 546 547 /* Caller should hold socket lock for the socket. */ 548 static void __tipc_shutdown(struct socket *sock, int error) 549 { 550 struct sock *sk = sock->sk; 551 struct tipc_sock *tsk = tipc_sk(sk); 552 struct net *net = sock_net(sk); 553 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 554 u32 dnode = tsk_peer_node(tsk); 555 struct sk_buff *skb; 556 557 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 558 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 559 !tsk_conn_cong(tsk))); 560 561 /* Push out delayed messages if in Nagle mode */ 562 tipc_sk_push_backlog(tsk, false); 563 /* Remove pending SYN */ 564 __skb_queue_purge(&sk->sk_write_queue); 565 566 /* Remove partially received buffer if any */ 567 skb = skb_peek(&sk->sk_receive_queue); 568 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 569 __skb_unlink(skb, &sk->sk_receive_queue); 570 kfree_skb(skb); 571 } 572 573 /* Reject all unreceived messages if connectionless */ 574 if (tipc_sk_type_connectionless(sk)) { 575 tsk_rej_rx_queue(sk, error); 576 return; 577 } 578 579 switch (sk->sk_state) { 580 case TIPC_CONNECTING: 581 case TIPC_ESTABLISHED: 582 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 583 tipc_node_remove_conn(net, dnode, tsk->portid); 584 /* Send a FIN+/- to its peer */ 585 skb = __skb_dequeue(&sk->sk_receive_queue); 586 if (skb) { 587 __skb_queue_purge(&sk->sk_receive_queue); 588 tipc_sk_respond(sk, skb, error); 589 break; 590 } 591 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 592 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 593 tsk_own_node(tsk), tsk_peer_port(tsk), 594 tsk->portid, error); 595 if (skb) 596 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 597 break; 598 case TIPC_LISTEN: 599 /* Reject all SYN messages */ 600 tsk_rej_rx_queue(sk, error); 601 break; 602 default: 603 __skb_queue_purge(&sk->sk_receive_queue); 604 break; 605 } 606 } 607 608 /** 609 * tipc_release - destroy a TIPC socket 610 * @sock: socket to destroy 611 * 612 * This routine cleans up any messages that are still queued on the socket. 613 * For DGRAM and RDM socket types, all queued messages are rejected. 614 * For SEQPACKET and STREAM socket types, the first message is rejected 615 * and any others are discarded. (If the first message on a STREAM socket 616 * is partially-read, it is discarded and the next one is rejected instead.) 617 * 618 * NOTE: Rejected messages are not necessarily returned to the sender! They 619 * are returned or discarded according to the "destination droppable" setting 620 * specified for the message by the sender. 621 * 622 * Return: 0 on success, errno otherwise 623 */ 624 static int tipc_release(struct socket *sock) 625 { 626 struct sock *sk = sock->sk; 627 struct tipc_sock *tsk; 628 629 /* 630 * Exit if socket isn't fully initialized (occurs when a failed accept() 631 * releases a pre-allocated child socket that was never used) 632 */ 633 if (sk == NULL) 634 return 0; 635 636 tsk = tipc_sk(sk); 637 lock_sock(sk); 638 639 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 640 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 641 sk->sk_shutdown = SHUTDOWN_MASK; 642 tipc_sk_leave(tsk); 643 tipc_sk_withdraw(tsk, NULL); 644 __skb_queue_purge(&tsk->mc_method.deferredq); 645 sk_stop_timer(sk, &sk->sk_timer); 646 tipc_sk_remove(tsk); 647 648 sock_orphan(sk); 649 /* Reject any messages that accumulated in backlog queue */ 650 release_sock(sk); 651 tipc_dest_list_purge(&tsk->cong_links); 652 tsk->cong_link_cnt = 0; 653 call_rcu(&tsk->rcu, tipc_sk_callback); 654 sock->sk = NULL; 655 656 return 0; 657 } 658 659 /** 660 * __tipc_bind - associate or disassocate TIPC name(s) with a socket 661 * @sock: socket structure 662 * @skaddr: socket address describing name(s) and desired operation 663 * @alen: size of socket address data structure 664 * 665 * Name and name sequence binding are indicated using a positive scope value; 666 * a negative scope value unbinds the specified name. Specifying no name 667 * (i.e. a socket address length of 0) unbinds all names from the socket. 668 * 669 * Return: 0 on success, errno otherwise 670 * 671 * NOTE: This routine doesn't need to take the socket lock since it doesn't 672 * access any non-constant socket information. 673 */ 674 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 675 { 676 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 677 struct tipc_sock *tsk = tipc_sk(sock->sk); 678 bool unbind = false; 679 680 if (unlikely(!alen)) 681 return tipc_sk_withdraw(tsk, NULL); 682 683 if (ua->addrtype == TIPC_SERVICE_ADDR) { 684 ua->addrtype = TIPC_SERVICE_RANGE; 685 ua->sr.upper = ua->sr.lower; 686 } 687 if (ua->scope < 0) { 688 unbind = true; 689 ua->scope = -ua->scope; 690 } 691 /* Users may still use deprecated TIPC_ZONE_SCOPE */ 692 if (ua->scope != TIPC_NODE_SCOPE) 693 ua->scope = TIPC_CLUSTER_SCOPE; 694 695 if (tsk->group) 696 return -EACCES; 697 698 if (unbind) 699 return tipc_sk_withdraw(tsk, ua); 700 return tipc_sk_publish(tsk, ua); 701 } 702 703 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 704 { 705 int res; 706 707 lock_sock(sock->sk); 708 res = __tipc_bind(sock, skaddr, alen); 709 release_sock(sock->sk); 710 return res; 711 } 712 713 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 714 { 715 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 716 u32 atype = ua->addrtype; 717 718 if (alen) { 719 if (!tipc_uaddr_valid(ua, alen)) 720 return -EINVAL; 721 if (atype == TIPC_SOCKET_ADDR) 722 return -EAFNOSUPPORT; 723 if (ua->sr.type < TIPC_RESERVED_TYPES) { 724 pr_warn_once("Can't bind to reserved service type %u\n", 725 ua->sr.type); 726 return -EACCES; 727 } 728 } 729 return tipc_sk_bind(sock, skaddr, alen); 730 } 731 732 /** 733 * tipc_getname - get port ID of socket or peer socket 734 * @sock: socket structure 735 * @uaddr: area for returned socket address 736 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 737 * 738 * Return: 0 on success, errno otherwise 739 * 740 * NOTE: This routine doesn't need to take the socket lock since it only 741 * accesses socket information that is unchanging (or which changes in 742 * a completely predictable manner). 743 */ 744 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 745 int peer) 746 { 747 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 748 struct sock *sk = sock->sk; 749 struct tipc_sock *tsk = tipc_sk(sk); 750 751 memset(addr, 0, sizeof(*addr)); 752 if (peer) { 753 if ((!tipc_sk_connected(sk)) && 754 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 755 return -ENOTCONN; 756 addr->addr.id.ref = tsk_peer_port(tsk); 757 addr->addr.id.node = tsk_peer_node(tsk); 758 } else { 759 addr->addr.id.ref = tsk->portid; 760 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 761 } 762 763 addr->addrtype = TIPC_SOCKET_ADDR; 764 addr->family = AF_TIPC; 765 addr->scope = 0; 766 addr->addr.name.domain = 0; 767 768 return sizeof(*addr); 769 } 770 771 /** 772 * tipc_poll - read and possibly block on pollmask 773 * @file: file structure associated with the socket 774 * @sock: socket for which to calculate the poll bits 775 * @wait: ??? 776 * 777 * Return: pollmask value 778 * 779 * COMMENTARY: 780 * It appears that the usual socket locking mechanisms are not useful here 781 * since the pollmask info is potentially out-of-date the moment this routine 782 * exits. TCP and other protocols seem to rely on higher level poll routines 783 * to handle any preventable race conditions, so TIPC will do the same ... 784 * 785 * IMPORTANT: The fact that a read or write operation is indicated does NOT 786 * imply that the operation will succeed, merely that it should be performed 787 * and will not block. 788 */ 789 static __poll_t tipc_poll(struct file *file, struct socket *sock, 790 poll_table *wait) 791 { 792 struct sock *sk = sock->sk; 793 struct tipc_sock *tsk = tipc_sk(sk); 794 __poll_t revents = 0; 795 796 sock_poll_wait(file, sock, wait); 797 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 798 799 if (sk->sk_shutdown & RCV_SHUTDOWN) 800 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 801 if (sk->sk_shutdown == SHUTDOWN_MASK) 802 revents |= EPOLLHUP; 803 804 switch (sk->sk_state) { 805 case TIPC_ESTABLISHED: 806 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 807 revents |= EPOLLOUT; 808 fallthrough; 809 case TIPC_LISTEN: 810 case TIPC_CONNECTING: 811 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 812 revents |= EPOLLIN | EPOLLRDNORM; 813 break; 814 case TIPC_OPEN: 815 if (tsk->group_is_open && !tsk->cong_link_cnt) 816 revents |= EPOLLOUT; 817 if (!tipc_sk_type_connectionless(sk)) 818 break; 819 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 820 break; 821 revents |= EPOLLIN | EPOLLRDNORM; 822 break; 823 case TIPC_DISCONNECTING: 824 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 825 break; 826 } 827 return revents; 828 } 829 830 /** 831 * tipc_sendmcast - send multicast message 832 * @sock: socket structure 833 * @ua: destination address struct 834 * @msg: message to send 835 * @dlen: length of data to send 836 * @timeout: timeout to wait for wakeup 837 * 838 * Called from function tipc_sendmsg(), which has done all sanity checks 839 * Return: the number of bytes sent on success, or errno 840 */ 841 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua, 842 struct msghdr *msg, size_t dlen, long timeout) 843 { 844 struct sock *sk = sock->sk; 845 struct tipc_sock *tsk = tipc_sk(sk); 846 struct tipc_msg *hdr = &tsk->phdr; 847 struct net *net = sock_net(sk); 848 int mtu = tipc_bcast_get_mtu(net); 849 struct sk_buff_head pkts; 850 struct tipc_nlist dsts; 851 int rc; 852 853 if (tsk->group) 854 return -EACCES; 855 856 /* Block or return if any destination link is congested */ 857 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 858 if (unlikely(rc)) 859 return rc; 860 861 /* Lookup destination nodes */ 862 tipc_nlist_init(&dsts, tipc_own_addr(net)); 863 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts); 864 if (!dsts.local && !dsts.remote) 865 return -EHOSTUNREACH; 866 867 /* Build message header */ 868 msg_set_type(hdr, TIPC_MCAST_MSG); 869 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 870 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 871 msg_set_destport(hdr, 0); 872 msg_set_destnode(hdr, 0); 873 msg_set_nametype(hdr, ua->sr.type); 874 msg_set_namelower(hdr, ua->sr.lower); 875 msg_set_nameupper(hdr, ua->sr.upper); 876 877 /* Build message as chain of buffers */ 878 __skb_queue_head_init(&pkts); 879 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 880 881 /* Send message if build was successful */ 882 if (unlikely(rc == dlen)) { 883 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 884 TIPC_DUMP_SK_SNDQ, " "); 885 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts, 886 &tsk->cong_link_cnt); 887 } 888 889 tipc_nlist_purge(&dsts); 890 891 return rc ? rc : dlen; 892 } 893 894 /** 895 * tipc_send_group_msg - send a message to a member in the group 896 * @net: network namespace 897 * @tsk: tipc socket 898 * @m: message to send 899 * @mb: group member 900 * @dnode: destination node 901 * @dport: destination port 902 * @dlen: total length of message data 903 */ 904 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 905 struct msghdr *m, struct tipc_member *mb, 906 u32 dnode, u32 dport, int dlen) 907 { 908 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 909 struct tipc_mc_method *method = &tsk->mc_method; 910 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 911 struct tipc_msg *hdr = &tsk->phdr; 912 struct sk_buff_head pkts; 913 int mtu, rc; 914 915 /* Complete message header */ 916 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 917 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 918 msg_set_destport(hdr, dport); 919 msg_set_destnode(hdr, dnode); 920 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 921 922 /* Build message as chain of buffers */ 923 __skb_queue_head_init(&pkts); 924 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 925 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 926 if (unlikely(rc != dlen)) 927 return rc; 928 929 /* Send message */ 930 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 931 if (unlikely(rc == -ELINKCONG)) { 932 tipc_dest_push(&tsk->cong_links, dnode, 0); 933 tsk->cong_link_cnt++; 934 } 935 936 /* Update send window */ 937 tipc_group_update_member(mb, blks); 938 939 /* A broadcast sent within next EXPIRE period must follow same path */ 940 method->rcast = true; 941 method->mandatory = true; 942 return dlen; 943 } 944 945 /** 946 * tipc_send_group_unicast - send message to a member in the group 947 * @sock: socket structure 948 * @m: message to send 949 * @dlen: total length of message data 950 * @timeout: timeout to wait for wakeup 951 * 952 * Called from function tipc_sendmsg(), which has done all sanity checks 953 * Return: the number of bytes sent on success, or errno 954 */ 955 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 956 int dlen, long timeout) 957 { 958 struct sock *sk = sock->sk; 959 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 960 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 961 struct tipc_sock *tsk = tipc_sk(sk); 962 struct net *net = sock_net(sk); 963 struct tipc_member *mb = NULL; 964 u32 node, port; 965 int rc; 966 967 node = ua->sk.node; 968 port = ua->sk.ref; 969 if (!port && !node) 970 return -EHOSTUNREACH; 971 972 /* Block or return if destination link or member is congested */ 973 rc = tipc_wait_for_cond(sock, &timeout, 974 !tipc_dest_find(&tsk->cong_links, node, 0) && 975 tsk->group && 976 !tipc_group_cong(tsk->group, node, port, blks, 977 &mb)); 978 if (unlikely(rc)) 979 return rc; 980 981 if (unlikely(!mb)) 982 return -EHOSTUNREACH; 983 984 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 985 986 return rc ? rc : dlen; 987 } 988 989 /** 990 * tipc_send_group_anycast - send message to any member with given identity 991 * @sock: socket structure 992 * @m: message to send 993 * @dlen: total length of message data 994 * @timeout: timeout to wait for wakeup 995 * 996 * Called from function tipc_sendmsg(), which has done all sanity checks 997 * Return: the number of bytes sent on success, or errno 998 */ 999 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 1000 int dlen, long timeout) 1001 { 1002 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1003 struct sock *sk = sock->sk; 1004 struct tipc_sock *tsk = tipc_sk(sk); 1005 struct list_head *cong_links = &tsk->cong_links; 1006 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 1007 struct tipc_msg *hdr = &tsk->phdr; 1008 struct tipc_member *first = NULL; 1009 struct tipc_member *mbr = NULL; 1010 struct net *net = sock_net(sk); 1011 u32 node, port, exclude; 1012 struct list_head dsts; 1013 int lookups = 0; 1014 int dstcnt, rc; 1015 bool cong; 1016 1017 INIT_LIST_HEAD(&dsts); 1018 ua->sa.type = msg_nametype(hdr); 1019 ua->scope = msg_lookup_scope(hdr); 1020 1021 while (++lookups < 4) { 1022 exclude = tipc_group_exclude(tsk->group); 1023 1024 first = NULL; 1025 1026 /* Look for a non-congested destination member, if any */ 1027 while (1) { 1028 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, 1029 exclude, false)) 1030 return -EHOSTUNREACH; 1031 tipc_dest_pop(&dsts, &node, &port); 1032 cong = tipc_group_cong(tsk->group, node, port, blks, 1033 &mbr); 1034 if (!cong) 1035 break; 1036 if (mbr == first) 1037 break; 1038 if (!first) 1039 first = mbr; 1040 } 1041 1042 /* Start over if destination was not in member list */ 1043 if (unlikely(!mbr)) 1044 continue; 1045 1046 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1047 break; 1048 1049 /* Block or return if destination link or member is congested */ 1050 rc = tipc_wait_for_cond(sock, &timeout, 1051 !tipc_dest_find(cong_links, node, 0) && 1052 tsk->group && 1053 !tipc_group_cong(tsk->group, node, port, 1054 blks, &mbr)); 1055 if (unlikely(rc)) 1056 return rc; 1057 1058 /* Send, unless destination disappeared while waiting */ 1059 if (likely(mbr)) 1060 break; 1061 } 1062 1063 if (unlikely(lookups >= 4)) 1064 return -EHOSTUNREACH; 1065 1066 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1067 1068 return rc ? rc : dlen; 1069 } 1070 1071 /** 1072 * tipc_send_group_bcast - send message to all members in communication group 1073 * @sock: socket structure 1074 * @m: message to send 1075 * @dlen: total length of message data 1076 * @timeout: timeout to wait for wakeup 1077 * 1078 * Called from function tipc_sendmsg(), which has done all sanity checks 1079 * Return: the number of bytes sent on success, or errno 1080 */ 1081 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1082 int dlen, long timeout) 1083 { 1084 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1085 struct sock *sk = sock->sk; 1086 struct net *net = sock_net(sk); 1087 struct tipc_sock *tsk = tipc_sk(sk); 1088 struct tipc_nlist *dsts; 1089 struct tipc_mc_method *method = &tsk->mc_method; 1090 bool ack = method->mandatory && method->rcast; 1091 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1092 struct tipc_msg *hdr = &tsk->phdr; 1093 int mtu = tipc_bcast_get_mtu(net); 1094 struct sk_buff_head pkts; 1095 int rc = -EHOSTUNREACH; 1096 1097 /* Block or return if any destination link or member is congested */ 1098 rc = tipc_wait_for_cond(sock, &timeout, 1099 !tsk->cong_link_cnt && tsk->group && 1100 !tipc_group_bc_cong(tsk->group, blks)); 1101 if (unlikely(rc)) 1102 return rc; 1103 1104 dsts = tipc_group_dests(tsk->group); 1105 if (!dsts->local && !dsts->remote) 1106 return -EHOSTUNREACH; 1107 1108 /* Complete message header */ 1109 if (ua) { 1110 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1111 msg_set_nameinst(hdr, ua->sa.instance); 1112 } else { 1113 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1114 msg_set_nameinst(hdr, 0); 1115 } 1116 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1117 msg_set_destport(hdr, 0); 1118 msg_set_destnode(hdr, 0); 1119 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1120 1121 /* Avoid getting stuck with repeated forced replicasts */ 1122 msg_set_grp_bc_ack_req(hdr, ack); 1123 1124 /* Build message as chain of buffers */ 1125 __skb_queue_head_init(&pkts); 1126 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1127 if (unlikely(rc != dlen)) 1128 return rc; 1129 1130 /* Send message */ 1131 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1132 if (unlikely(rc)) 1133 return rc; 1134 1135 /* Update broadcast sequence number and send windows */ 1136 tipc_group_update_bc_members(tsk->group, blks, ack); 1137 1138 /* Broadcast link is now free to choose method for next broadcast */ 1139 method->mandatory = false; 1140 method->expires = jiffies; 1141 1142 return dlen; 1143 } 1144 1145 /** 1146 * tipc_send_group_mcast - send message to all members with given identity 1147 * @sock: socket structure 1148 * @m: message to send 1149 * @dlen: total length of message data 1150 * @timeout: timeout to wait for wakeup 1151 * 1152 * Called from function tipc_sendmsg(), which has done all sanity checks 1153 * Return: the number of bytes sent on success, or errno 1154 */ 1155 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1156 int dlen, long timeout) 1157 { 1158 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1159 struct sock *sk = sock->sk; 1160 struct tipc_sock *tsk = tipc_sk(sk); 1161 struct tipc_group *grp = tsk->group; 1162 struct tipc_msg *hdr = &tsk->phdr; 1163 struct net *net = sock_net(sk); 1164 struct list_head dsts; 1165 u32 dstcnt, exclude; 1166 1167 INIT_LIST_HEAD(&dsts); 1168 ua->sa.type = msg_nametype(hdr); 1169 ua->scope = msg_lookup_scope(hdr); 1170 exclude = tipc_group_exclude(grp); 1171 1172 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true)) 1173 return -EHOSTUNREACH; 1174 1175 if (dstcnt == 1) { 1176 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref); 1177 return tipc_send_group_unicast(sock, m, dlen, timeout); 1178 } 1179 1180 tipc_dest_list_purge(&dsts); 1181 return tipc_send_group_bcast(sock, m, dlen, timeout); 1182 } 1183 1184 /** 1185 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1186 * @net: the associated network namespace 1187 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1188 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1189 * 1190 * Multi-threaded: parallel calls with reference to same queues may occur 1191 */ 1192 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1193 struct sk_buff_head *inputq) 1194 { 1195 u32 self = tipc_own_addr(net); 1196 struct sk_buff *skb, *_skb; 1197 u32 portid, onode; 1198 struct sk_buff_head tmpq; 1199 struct list_head dports; 1200 struct tipc_msg *hdr; 1201 struct tipc_uaddr ua; 1202 int user, mtyp, hlen; 1203 1204 __skb_queue_head_init(&tmpq); 1205 INIT_LIST_HEAD(&dports); 1206 ua.addrtype = TIPC_SERVICE_RANGE; 1207 1208 /* tipc_skb_peek() increments the head skb's reference counter */ 1209 skb = tipc_skb_peek(arrvq, &inputq->lock); 1210 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1211 hdr = buf_msg(skb); 1212 user = msg_user(hdr); 1213 mtyp = msg_type(hdr); 1214 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1215 onode = msg_orignode(hdr); 1216 ua.sr.type = msg_nametype(hdr); 1217 ua.sr.lower = msg_namelower(hdr); 1218 ua.sr.upper = msg_nameupper(hdr); 1219 if (onode == self) 1220 ua.scope = TIPC_ANY_SCOPE; 1221 else 1222 ua.scope = TIPC_CLUSTER_SCOPE; 1223 1224 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1225 spin_lock_bh(&inputq->lock); 1226 if (skb_peek(arrvq) == skb) { 1227 __skb_dequeue(arrvq); 1228 __skb_queue_tail(inputq, skb); 1229 } 1230 kfree_skb(skb); 1231 spin_unlock_bh(&inputq->lock); 1232 continue; 1233 } 1234 1235 /* Group messages require exact scope match */ 1236 if (msg_in_group(hdr)) { 1237 ua.sr.lower = 0; 1238 ua.sr.upper = ~0; 1239 ua.scope = msg_lookup_scope(hdr); 1240 } 1241 1242 /* Create destination port list: */ 1243 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports); 1244 1245 /* Clone message per destination */ 1246 while (tipc_dest_pop(&dports, NULL, &portid)) { 1247 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1248 if (_skb) { 1249 msg_set_destport(buf_msg(_skb), portid); 1250 __skb_queue_tail(&tmpq, _skb); 1251 continue; 1252 } 1253 pr_warn("Failed to clone mcast rcv buffer\n"); 1254 } 1255 /* Append clones to inputq only if skb is still head of arrvq */ 1256 spin_lock_bh(&inputq->lock); 1257 if (skb_peek(arrvq) == skb) { 1258 skb_queue_splice_tail_init(&tmpq, inputq); 1259 /* Decrement the skb's refcnt */ 1260 kfree_skb(__skb_dequeue(arrvq)); 1261 } 1262 spin_unlock_bh(&inputq->lock); 1263 __skb_queue_purge(&tmpq); 1264 kfree_skb(skb); 1265 } 1266 tipc_sk_rcv(net, inputq); 1267 } 1268 1269 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1270 * when socket is in Nagle mode 1271 */ 1272 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1273 { 1274 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1275 struct sk_buff *skb = skb_peek_tail(txq); 1276 struct net *net = sock_net(&tsk->sk); 1277 u32 dnode = tsk_peer_node(tsk); 1278 int rc; 1279 1280 if (nagle_ack) { 1281 tsk->pkt_cnt += skb_queue_len(txq); 1282 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1283 tsk->oneway = 0; 1284 if (tsk->nagle_start < NAGLE_START_MAX) 1285 tsk->nagle_start *= 2; 1286 tsk->expect_ack = false; 1287 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1288 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1289 tsk->nagle_start); 1290 } else { 1291 tsk->nagle_start = NAGLE_START_INIT; 1292 if (skb) { 1293 msg_set_ack_required(buf_msg(skb)); 1294 tsk->expect_ack = true; 1295 } else { 1296 tsk->expect_ack = false; 1297 } 1298 } 1299 tsk->msg_acc = 0; 1300 tsk->pkt_cnt = 0; 1301 } 1302 1303 if (!skb || tsk->cong_link_cnt) 1304 return; 1305 1306 /* Do not send SYN again after congestion */ 1307 if (msg_is_syn(buf_msg(skb))) 1308 return; 1309 1310 if (tsk->msg_acc) 1311 tsk->pkt_cnt += skb_queue_len(txq); 1312 tsk->snt_unacked += tsk->snd_backlog; 1313 tsk->snd_backlog = 0; 1314 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1315 if (rc == -ELINKCONG) 1316 tsk->cong_link_cnt = 1; 1317 } 1318 1319 /** 1320 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1321 * @tsk: receiving socket 1322 * @skb: pointer to message buffer. 1323 * @inputq: buffer list containing the buffers 1324 * @xmitq: output message area 1325 */ 1326 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1327 struct sk_buff_head *inputq, 1328 struct sk_buff_head *xmitq) 1329 { 1330 struct tipc_msg *hdr = buf_msg(skb); 1331 u32 onode = tsk_own_node(tsk); 1332 struct sock *sk = &tsk->sk; 1333 int mtyp = msg_type(hdr); 1334 bool was_cong; 1335 1336 /* Ignore if connection cannot be validated: */ 1337 if (!tsk_peer_msg(tsk, hdr)) { 1338 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1339 goto exit; 1340 } 1341 1342 if (unlikely(msg_errcode(hdr))) { 1343 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1344 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1345 tsk_peer_port(tsk)); 1346 sk->sk_state_change(sk); 1347 1348 /* State change is ignored if socket already awake, 1349 * - convert msg to abort msg and add to inqueue 1350 */ 1351 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1352 msg_set_type(hdr, TIPC_CONN_MSG); 1353 msg_set_size(hdr, BASIC_H_SIZE); 1354 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1355 __skb_queue_tail(inputq, skb); 1356 return; 1357 } 1358 1359 tsk->probe_unacked = false; 1360 1361 if (mtyp == CONN_PROBE) { 1362 msg_set_type(hdr, CONN_PROBE_REPLY); 1363 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1364 __skb_queue_tail(xmitq, skb); 1365 return; 1366 } else if (mtyp == CONN_ACK) { 1367 was_cong = tsk_conn_cong(tsk); 1368 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1369 tsk->snt_unacked -= msg_conn_ack(hdr); 1370 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1371 tsk->snd_win = msg_adv_win(hdr); 1372 if (was_cong && !tsk_conn_cong(tsk)) 1373 sk->sk_write_space(sk); 1374 } else if (mtyp != CONN_PROBE_REPLY) { 1375 pr_warn("Received unknown CONN_PROTO msg\n"); 1376 } 1377 exit: 1378 kfree_skb(skb); 1379 } 1380 1381 /** 1382 * tipc_sendmsg - send message in connectionless manner 1383 * @sock: socket structure 1384 * @m: message to send 1385 * @dsz: amount of user data to be sent 1386 * 1387 * Message must have an destination specified explicitly. 1388 * Used for SOCK_RDM and SOCK_DGRAM messages, 1389 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1390 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1391 * 1392 * Return: the number of bytes sent on success, or errno otherwise 1393 */ 1394 static int tipc_sendmsg(struct socket *sock, 1395 struct msghdr *m, size_t dsz) 1396 { 1397 struct sock *sk = sock->sk; 1398 int ret; 1399 1400 lock_sock(sk); 1401 ret = __tipc_sendmsg(sock, m, dsz); 1402 release_sock(sk); 1403 1404 return ret; 1405 } 1406 1407 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1408 { 1409 struct sock *sk = sock->sk; 1410 struct net *net = sock_net(sk); 1411 struct tipc_sock *tsk = tipc_sk(sk); 1412 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1413 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1414 struct list_head *clinks = &tsk->cong_links; 1415 bool syn = !tipc_sk_type_connectionless(sk); 1416 struct tipc_group *grp = tsk->group; 1417 struct tipc_msg *hdr = &tsk->phdr; 1418 struct tipc_socket_addr skaddr; 1419 struct sk_buff_head pkts; 1420 int atype, mtu, rc; 1421 1422 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1423 return -EMSGSIZE; 1424 1425 if (ua) { 1426 if (!tipc_uaddr_valid(ua, m->msg_namelen)) 1427 return -EINVAL; 1428 atype = ua->addrtype; 1429 } 1430 1431 /* If socket belongs to a communication group follow other paths */ 1432 if (grp) { 1433 if (!ua) 1434 return tipc_send_group_bcast(sock, m, dlen, timeout); 1435 if (atype == TIPC_SERVICE_ADDR) 1436 return tipc_send_group_anycast(sock, m, dlen, timeout); 1437 if (atype == TIPC_SOCKET_ADDR) 1438 return tipc_send_group_unicast(sock, m, dlen, timeout); 1439 if (atype == TIPC_SERVICE_RANGE) 1440 return tipc_send_group_mcast(sock, m, dlen, timeout); 1441 return -EINVAL; 1442 } 1443 1444 if (!ua) { 1445 ua = (struct tipc_uaddr *)&tsk->peer; 1446 if (!syn && ua->family != AF_TIPC) 1447 return -EDESTADDRREQ; 1448 atype = ua->addrtype; 1449 } 1450 1451 if (unlikely(syn)) { 1452 if (sk->sk_state == TIPC_LISTEN) 1453 return -EPIPE; 1454 if (sk->sk_state != TIPC_OPEN) 1455 return -EISCONN; 1456 if (tsk->published) 1457 return -EOPNOTSUPP; 1458 if (atype == TIPC_SERVICE_ADDR) 1459 tsk->conn_addrtype = atype; 1460 msg_set_syn(hdr, 1); 1461 } 1462 1463 /* Determine destination */ 1464 if (atype == TIPC_SERVICE_RANGE) { 1465 return tipc_sendmcast(sock, ua, m, dlen, timeout); 1466 } else if (atype == TIPC_SERVICE_ADDR) { 1467 skaddr.node = ua->lookup_node; 1468 ua->scope = tipc_node2scope(skaddr.node); 1469 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr)) 1470 return -EHOSTUNREACH; 1471 } else if (atype == TIPC_SOCKET_ADDR) { 1472 skaddr = ua->sk; 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, skaddr.node, 0)); 1480 if (unlikely(rc)) 1481 return rc; 1482 1483 /* Finally build message header */ 1484 msg_set_destnode(hdr, skaddr.node); 1485 msg_set_destport(hdr, skaddr.ref); 1486 if (atype == TIPC_SERVICE_ADDR) { 1487 msg_set_type(hdr, TIPC_NAMED_MSG); 1488 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1489 msg_set_nametype(hdr, ua->sa.type); 1490 msg_set_nameinst(hdr, ua->sa.instance); 1491 msg_set_lookup_scope(hdr, ua->scope); 1492 } else { /* TIPC_SOCKET_ADDR */ 1493 msg_set_type(hdr, TIPC_DIRECT_MSG); 1494 msg_set_lookup_scope(hdr, 0); 1495 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1496 } 1497 1498 /* Add message body */ 1499 __skb_queue_head_init(&pkts); 1500 mtu = tipc_node_get_mtu(net, skaddr.node, 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 /* Send message */ 1510 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1511 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid); 1512 if (unlikely(rc == -ELINKCONG)) { 1513 tipc_dest_push(clinks, skaddr.node, 0); 1514 tsk->cong_link_cnt++; 1515 rc = 0; 1516 } 1517 1518 if (unlikely(syn && !rc)) 1519 tipc_set_sk_state(sk, TIPC_CONNECTING); 1520 1521 return rc ? rc : dlen; 1522 } 1523 1524 /** 1525 * tipc_sendstream - send stream-oriented data 1526 * @sock: socket structure 1527 * @m: data to send 1528 * @dsz: total length of data to be transmitted 1529 * 1530 * Used for SOCK_STREAM data. 1531 * 1532 * Return: the number of bytes sent on success (or partial success), 1533 * or errno if no data sent 1534 */ 1535 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1536 { 1537 struct sock *sk = sock->sk; 1538 int ret; 1539 1540 lock_sock(sk); 1541 ret = __tipc_sendstream(sock, m, dsz); 1542 release_sock(sk); 1543 1544 return ret; 1545 } 1546 1547 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1548 { 1549 struct sock *sk = sock->sk; 1550 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1551 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1552 struct sk_buff_head *txq = &sk->sk_write_queue; 1553 struct tipc_sock *tsk = tipc_sk(sk); 1554 struct tipc_msg *hdr = &tsk->phdr; 1555 struct net *net = sock_net(sk); 1556 struct sk_buff *skb; 1557 u32 dnode = tsk_peer_node(tsk); 1558 int maxnagle = tsk->maxnagle; 1559 int maxpkt = tsk->max_pkt; 1560 int send, sent = 0; 1561 int blocks, rc = 0; 1562 1563 if (unlikely(dlen > INT_MAX)) 1564 return -EMSGSIZE; 1565 1566 /* Handle implicit connection setup */ 1567 if (unlikely(dest)) { 1568 rc = __tipc_sendmsg(sock, m, dlen); 1569 if (dlen && dlen == rc) { 1570 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1571 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1572 } 1573 return rc; 1574 } 1575 1576 do { 1577 rc = tipc_wait_for_cond(sock, &timeout, 1578 (!tsk->cong_link_cnt && 1579 !tsk_conn_cong(tsk) && 1580 tipc_sk_connected(sk))); 1581 if (unlikely(rc)) 1582 break; 1583 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1584 blocks = tsk->snd_backlog; 1585 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1586 send <= maxnagle) { 1587 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1588 if (unlikely(rc < 0)) 1589 break; 1590 blocks += rc; 1591 tsk->msg_acc++; 1592 if (blocks <= 64 && tsk->expect_ack) { 1593 tsk->snd_backlog = blocks; 1594 sent += send; 1595 break; 1596 } else if (blocks > 64) { 1597 tsk->pkt_cnt += skb_queue_len(txq); 1598 } else { 1599 skb = skb_peek_tail(txq); 1600 if (skb) { 1601 msg_set_ack_required(buf_msg(skb)); 1602 tsk->expect_ack = true; 1603 } else { 1604 tsk->expect_ack = false; 1605 } 1606 tsk->msg_acc = 0; 1607 tsk->pkt_cnt = 0; 1608 } 1609 } else { 1610 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1611 if (unlikely(rc != send)) 1612 break; 1613 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1614 } 1615 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1616 TIPC_DUMP_SK_SNDQ, " "); 1617 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1618 if (unlikely(rc == -ELINKCONG)) { 1619 tsk->cong_link_cnt = 1; 1620 rc = 0; 1621 } 1622 if (likely(!rc)) { 1623 tsk->snt_unacked += blocks; 1624 tsk->snd_backlog = 0; 1625 sent += send; 1626 } 1627 } while (sent < dlen && !rc); 1628 1629 return sent ? sent : rc; 1630 } 1631 1632 /** 1633 * tipc_send_packet - send a connection-oriented message 1634 * @sock: socket structure 1635 * @m: message to send 1636 * @dsz: length of data to be transmitted 1637 * 1638 * Used for SOCK_SEQPACKET messages. 1639 * 1640 * Return: the number of bytes sent on success, or errno otherwise 1641 */ 1642 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1643 { 1644 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1645 return -EMSGSIZE; 1646 1647 return tipc_sendstream(sock, m, dsz); 1648 } 1649 1650 /* tipc_sk_finish_conn - complete the setup of a connection 1651 */ 1652 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1653 u32 peer_node) 1654 { 1655 struct sock *sk = &tsk->sk; 1656 struct net *net = sock_net(sk); 1657 struct tipc_msg *msg = &tsk->phdr; 1658 1659 msg_set_syn(msg, 0); 1660 msg_set_destnode(msg, peer_node); 1661 msg_set_destport(msg, peer_port); 1662 msg_set_type(msg, TIPC_CONN_MSG); 1663 msg_set_lookup_scope(msg, 0); 1664 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1665 1666 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1667 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1668 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1669 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1670 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1671 tsk_set_nagle(tsk); 1672 __skb_queue_purge(&sk->sk_write_queue); 1673 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1674 return; 1675 1676 /* Fall back to message based flow control */ 1677 tsk->rcv_win = FLOWCTL_MSG_WIN; 1678 tsk->snd_win = FLOWCTL_MSG_WIN; 1679 } 1680 1681 /** 1682 * tipc_sk_set_orig_addr - capture sender's address for received message 1683 * @m: descriptor for message info 1684 * @skb: received message 1685 * 1686 * Note: Address is not captured if not requested by receiver. 1687 */ 1688 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1689 { 1690 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1691 struct tipc_msg *hdr = buf_msg(skb); 1692 1693 if (!srcaddr) 1694 return; 1695 1696 srcaddr->sock.family = AF_TIPC; 1697 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR; 1698 srcaddr->sock.scope = 0; 1699 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1700 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1701 srcaddr->sock.addr.name.domain = 0; 1702 m->msg_namelen = sizeof(struct sockaddr_tipc); 1703 1704 if (!msg_in_group(hdr)) 1705 return; 1706 1707 /* Group message users may also want to know sending member's id */ 1708 srcaddr->member.family = AF_TIPC; 1709 srcaddr->member.addrtype = TIPC_SERVICE_ADDR; 1710 srcaddr->member.scope = 0; 1711 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1712 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1713 srcaddr->member.addr.name.domain = 0; 1714 m->msg_namelen = sizeof(*srcaddr); 1715 } 1716 1717 /** 1718 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1719 * @m: descriptor for message info 1720 * @skb: received message buffer 1721 * @tsk: TIPC port associated with message 1722 * 1723 * Note: Ancillary data is not captured if not requested by receiver. 1724 * 1725 * Return: 0 if successful, otherwise errno 1726 */ 1727 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1728 struct tipc_sock *tsk) 1729 { 1730 struct tipc_msg *hdr; 1731 u32 data[3] = {0,}; 1732 bool has_addr; 1733 int dlen, rc; 1734 1735 if (likely(m->msg_controllen == 0)) 1736 return 0; 1737 1738 hdr = buf_msg(skb); 1739 dlen = msg_data_sz(hdr); 1740 1741 /* Capture errored message object, if any */ 1742 if (msg_errcode(hdr)) { 1743 if (skb_linearize(skb)) 1744 return -ENOMEM; 1745 hdr = buf_msg(skb); 1746 data[0] = msg_errcode(hdr); 1747 data[1] = dlen; 1748 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data); 1749 if (rc || !dlen) 1750 return rc; 1751 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr)); 1752 if (rc) 1753 return rc; 1754 } 1755 1756 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */ 1757 switch (msg_type(hdr)) { 1758 case TIPC_NAMED_MSG: 1759 has_addr = true; 1760 data[0] = msg_nametype(hdr); 1761 data[1] = msg_namelower(hdr); 1762 data[2] = data[1]; 1763 break; 1764 case TIPC_MCAST_MSG: 1765 has_addr = true; 1766 data[0] = msg_nametype(hdr); 1767 data[1] = msg_namelower(hdr); 1768 data[2] = msg_nameupper(hdr); 1769 break; 1770 case TIPC_CONN_MSG: 1771 has_addr = !!tsk->conn_addrtype; 1772 data[0] = msg_nametype(&tsk->phdr); 1773 data[1] = msg_nameinst(&tsk->phdr); 1774 data[2] = data[1]; 1775 break; 1776 default: 1777 has_addr = false; 1778 } 1779 if (!has_addr) 1780 return 0; 1781 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data); 1782 } 1783 1784 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1785 { 1786 struct sock *sk = &tsk->sk; 1787 struct sk_buff *skb = NULL; 1788 struct tipc_msg *msg; 1789 u32 peer_port = tsk_peer_port(tsk); 1790 u32 dnode = tsk_peer_node(tsk); 1791 1792 if (!tipc_sk_connected(sk)) 1793 return NULL; 1794 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1795 dnode, tsk_own_node(tsk), peer_port, 1796 tsk->portid, TIPC_OK); 1797 if (!skb) 1798 return NULL; 1799 msg = buf_msg(skb); 1800 msg_set_conn_ack(msg, tsk->rcv_unacked); 1801 tsk->rcv_unacked = 0; 1802 1803 /* Adjust to and advertize the correct window limit */ 1804 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1805 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1806 msg_set_adv_win(msg, tsk->rcv_win); 1807 } 1808 return skb; 1809 } 1810 1811 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1812 { 1813 struct sk_buff *skb; 1814 1815 skb = tipc_sk_build_ack(tsk); 1816 if (!skb) 1817 return; 1818 1819 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1820 msg_link_selector(buf_msg(skb))); 1821 } 1822 1823 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1824 { 1825 struct sock *sk = sock->sk; 1826 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1827 long timeo = *timeop; 1828 int err = sock_error(sk); 1829 1830 if (err) 1831 return err; 1832 1833 for (;;) { 1834 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1835 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1836 err = -ENOTCONN; 1837 break; 1838 } 1839 add_wait_queue(sk_sleep(sk), &wait); 1840 release_sock(sk); 1841 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1842 sched_annotate_sleep(); 1843 lock_sock(sk); 1844 remove_wait_queue(sk_sleep(sk), &wait); 1845 } 1846 err = 0; 1847 if (!skb_queue_empty(&sk->sk_receive_queue)) 1848 break; 1849 err = -EAGAIN; 1850 if (!timeo) 1851 break; 1852 err = sock_intr_errno(timeo); 1853 if (signal_pending(current)) 1854 break; 1855 1856 err = sock_error(sk); 1857 if (err) 1858 break; 1859 } 1860 *timeop = timeo; 1861 return err; 1862 } 1863 1864 /** 1865 * tipc_recvmsg - receive packet-oriented message 1866 * @sock: network socket 1867 * @m: descriptor for message info 1868 * @buflen: length of user buffer area 1869 * @flags: receive flags 1870 * 1871 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1872 * If the complete message doesn't fit in user area, truncate it. 1873 * 1874 * Return: size of returned message data, errno otherwise 1875 */ 1876 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1877 size_t buflen, int flags) 1878 { 1879 struct sock *sk = sock->sk; 1880 bool connected = !tipc_sk_type_connectionless(sk); 1881 struct tipc_sock *tsk = tipc_sk(sk); 1882 int rc, err, hlen, dlen, copy; 1883 struct tipc_skb_cb *skb_cb; 1884 struct sk_buff_head xmitq; 1885 struct tipc_msg *hdr; 1886 struct sk_buff *skb; 1887 bool grp_evt; 1888 long timeout; 1889 1890 /* Catch invalid receive requests */ 1891 if (unlikely(!buflen)) 1892 return -EINVAL; 1893 1894 lock_sock(sk); 1895 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1896 rc = -ENOTCONN; 1897 goto exit; 1898 } 1899 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1900 1901 /* Step rcv queue to first msg with data or error; wait if necessary */ 1902 do { 1903 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1904 if (unlikely(rc)) 1905 goto exit; 1906 skb = skb_peek(&sk->sk_receive_queue); 1907 skb_cb = TIPC_SKB_CB(skb); 1908 hdr = buf_msg(skb); 1909 dlen = msg_data_sz(hdr); 1910 hlen = msg_hdr_sz(hdr); 1911 err = msg_errcode(hdr); 1912 grp_evt = msg_is_grp_evt(hdr); 1913 if (likely(dlen || err)) 1914 break; 1915 tsk_advance_rx_queue(sk); 1916 } while (1); 1917 1918 /* Collect msg meta data, including error code and rejected data */ 1919 tipc_sk_set_orig_addr(m, skb); 1920 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1921 if (unlikely(rc)) 1922 goto exit; 1923 hdr = buf_msg(skb); 1924 1925 /* Capture data if non-error msg, otherwise just set return value */ 1926 if (likely(!err)) { 1927 int offset = skb_cb->bytes_read; 1928 1929 copy = min_t(int, dlen - offset, buflen); 1930 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 1931 if (unlikely(rc)) 1932 goto exit; 1933 if (unlikely(offset + copy < dlen)) { 1934 if (flags & MSG_EOR) { 1935 if (!(flags & MSG_PEEK)) 1936 skb_cb->bytes_read = offset + copy; 1937 } else { 1938 m->msg_flags |= MSG_TRUNC; 1939 skb_cb->bytes_read = 0; 1940 } 1941 } else { 1942 if (flags & MSG_EOR) 1943 m->msg_flags |= MSG_EOR; 1944 skb_cb->bytes_read = 0; 1945 } 1946 } else { 1947 copy = 0; 1948 rc = 0; 1949 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) { 1950 rc = -ECONNRESET; 1951 goto exit; 1952 } 1953 } 1954 1955 /* Mark message as group event if applicable */ 1956 if (unlikely(grp_evt)) { 1957 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1958 m->msg_flags |= MSG_EOR; 1959 m->msg_flags |= MSG_OOB; 1960 copy = 0; 1961 } 1962 1963 /* Caption of data or error code/rejected data was successful */ 1964 if (unlikely(flags & MSG_PEEK)) 1965 goto exit; 1966 1967 /* Send group flow control advertisement when applicable */ 1968 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1969 __skb_queue_head_init(&xmitq); 1970 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1971 msg_orignode(hdr), msg_origport(hdr), 1972 &xmitq); 1973 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1974 } 1975 1976 if (!skb_cb->bytes_read) 1977 tsk_advance_rx_queue(sk); 1978 1979 if (likely(!connected) || skb_cb->bytes_read) 1980 goto exit; 1981 1982 /* Send connection flow control advertisement when applicable */ 1983 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1984 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1985 tipc_sk_send_ack(tsk); 1986 exit: 1987 release_sock(sk); 1988 return rc ? rc : copy; 1989 } 1990 1991 /** 1992 * tipc_recvstream - receive stream-oriented data 1993 * @sock: network socket 1994 * @m: descriptor for message info 1995 * @buflen: total size of user buffer area 1996 * @flags: receive flags 1997 * 1998 * Used for SOCK_STREAM messages only. If not enough data is available 1999 * will optionally wait for more; never truncates data. 2000 * 2001 * Return: size of returned message data, errno otherwise 2002 */ 2003 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 2004 size_t buflen, int flags) 2005 { 2006 struct sock *sk = sock->sk; 2007 struct tipc_sock *tsk = tipc_sk(sk); 2008 struct sk_buff *skb; 2009 struct tipc_msg *hdr; 2010 struct tipc_skb_cb *skb_cb; 2011 bool peek = flags & MSG_PEEK; 2012 int offset, required, copy, copied = 0; 2013 int hlen, dlen, err, rc; 2014 long timeout; 2015 2016 /* Catch invalid receive attempts */ 2017 if (unlikely(!buflen)) 2018 return -EINVAL; 2019 2020 lock_sock(sk); 2021 2022 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2023 rc = -ENOTCONN; 2024 goto exit; 2025 } 2026 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2027 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2028 2029 do { 2030 /* Look at first msg in receive queue; wait if necessary */ 2031 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2032 if (unlikely(rc)) 2033 break; 2034 skb = skb_peek(&sk->sk_receive_queue); 2035 skb_cb = TIPC_SKB_CB(skb); 2036 hdr = buf_msg(skb); 2037 dlen = msg_data_sz(hdr); 2038 hlen = msg_hdr_sz(hdr); 2039 err = msg_errcode(hdr); 2040 2041 /* Discard any empty non-errored (SYN-) message */ 2042 if (unlikely(!dlen && !err)) { 2043 tsk_advance_rx_queue(sk); 2044 continue; 2045 } 2046 2047 /* Collect msg meta data, incl. error code and rejected data */ 2048 if (!copied) { 2049 tipc_sk_set_orig_addr(m, skb); 2050 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2051 if (rc) 2052 break; 2053 hdr = buf_msg(skb); 2054 } 2055 2056 /* Copy data if msg ok, otherwise return error/partial data */ 2057 if (likely(!err)) { 2058 offset = skb_cb->bytes_read; 2059 copy = min_t(int, dlen - offset, buflen - copied); 2060 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2061 if (unlikely(rc)) 2062 break; 2063 copied += copy; 2064 offset += copy; 2065 if (unlikely(offset < dlen)) { 2066 if (!peek) 2067 skb_cb->bytes_read = offset; 2068 break; 2069 } 2070 } else { 2071 rc = 0; 2072 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2073 rc = -ECONNRESET; 2074 if (copied || rc) 2075 break; 2076 } 2077 2078 if (unlikely(peek)) 2079 break; 2080 2081 tsk_advance_rx_queue(sk); 2082 2083 /* Send connection flow control advertisement when applicable */ 2084 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2085 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2086 tipc_sk_send_ack(tsk); 2087 2088 /* Exit if all requested data or FIN/error received */ 2089 if (copied == buflen || err) 2090 break; 2091 2092 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2093 exit: 2094 release_sock(sk); 2095 return copied ? copied : rc; 2096 } 2097 2098 /** 2099 * tipc_write_space - wake up thread if port congestion is released 2100 * @sk: socket 2101 */ 2102 static void tipc_write_space(struct sock *sk) 2103 { 2104 struct socket_wq *wq; 2105 2106 rcu_read_lock(); 2107 wq = rcu_dereference(sk->sk_wq); 2108 if (skwq_has_sleeper(wq)) 2109 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2110 EPOLLWRNORM | EPOLLWRBAND); 2111 rcu_read_unlock(); 2112 } 2113 2114 /** 2115 * tipc_data_ready - wake up threads to indicate messages have been received 2116 * @sk: socket 2117 */ 2118 static void tipc_data_ready(struct sock *sk) 2119 { 2120 struct socket_wq *wq; 2121 2122 rcu_read_lock(); 2123 wq = rcu_dereference(sk->sk_wq); 2124 if (skwq_has_sleeper(wq)) 2125 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2126 EPOLLRDNORM | EPOLLRDBAND); 2127 rcu_read_unlock(); 2128 } 2129 2130 static void tipc_sock_destruct(struct sock *sk) 2131 { 2132 __skb_queue_purge(&sk->sk_receive_queue); 2133 } 2134 2135 static void tipc_sk_proto_rcv(struct sock *sk, 2136 struct sk_buff_head *inputq, 2137 struct sk_buff_head *xmitq) 2138 { 2139 struct sk_buff *skb = __skb_dequeue(inputq); 2140 struct tipc_sock *tsk = tipc_sk(sk); 2141 struct tipc_msg *hdr = buf_msg(skb); 2142 struct tipc_group *grp = tsk->group; 2143 bool wakeup = false; 2144 2145 switch (msg_user(hdr)) { 2146 case CONN_MANAGER: 2147 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2148 return; 2149 case SOCK_WAKEUP: 2150 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2151 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2152 smp_wmb(); 2153 tsk->cong_link_cnt--; 2154 wakeup = true; 2155 tipc_sk_push_backlog(tsk, false); 2156 break; 2157 case GROUP_PROTOCOL: 2158 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2159 break; 2160 case TOP_SRV: 2161 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2162 hdr, inputq, xmitq); 2163 break; 2164 default: 2165 break; 2166 } 2167 2168 if (wakeup) 2169 sk->sk_write_space(sk); 2170 2171 kfree_skb(skb); 2172 } 2173 2174 /** 2175 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2176 * @tsk: TIPC socket 2177 * @skb: pointer to message buffer. 2178 * @xmitq: for Nagle ACK if any 2179 * Return: true if message should be added to receive queue, false otherwise 2180 */ 2181 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2182 struct sk_buff_head *xmitq) 2183 { 2184 struct sock *sk = &tsk->sk; 2185 struct net *net = sock_net(sk); 2186 struct tipc_msg *hdr = buf_msg(skb); 2187 bool con_msg = msg_connected(hdr); 2188 u32 pport = tsk_peer_port(tsk); 2189 u32 pnode = tsk_peer_node(tsk); 2190 u32 oport = msg_origport(hdr); 2191 u32 onode = msg_orignode(hdr); 2192 int err = msg_errcode(hdr); 2193 unsigned long delay; 2194 2195 if (unlikely(msg_mcast(hdr))) 2196 return false; 2197 tsk->oneway = 0; 2198 2199 switch (sk->sk_state) { 2200 case TIPC_CONNECTING: 2201 /* Setup ACK */ 2202 if (likely(con_msg)) { 2203 if (err) 2204 break; 2205 tipc_sk_finish_conn(tsk, oport, onode); 2206 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2207 /* ACK+ message with data is added to receive queue */ 2208 if (msg_data_sz(hdr)) 2209 return true; 2210 /* Empty ACK-, - wake up sleeping connect() and drop */ 2211 sk->sk_state_change(sk); 2212 msg_set_dest_droppable(hdr, 1); 2213 return false; 2214 } 2215 /* Ignore connectionless message if not from listening socket */ 2216 if (oport != pport || onode != pnode) 2217 return false; 2218 2219 /* Rejected SYN */ 2220 if (err != TIPC_ERR_OVERLOAD) 2221 break; 2222 2223 /* Prepare for new setup attempt if we have a SYN clone */ 2224 if (skb_queue_empty(&sk->sk_write_queue)) 2225 break; 2226 get_random_bytes(&delay, 2); 2227 delay %= (tsk->conn_timeout / 4); 2228 delay = msecs_to_jiffies(delay + 100); 2229 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2230 return false; 2231 case TIPC_OPEN: 2232 case TIPC_DISCONNECTING: 2233 return false; 2234 case TIPC_LISTEN: 2235 /* Accept only SYN message */ 2236 if (!msg_is_syn(hdr) && 2237 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2238 return false; 2239 if (!con_msg && !err) 2240 return true; 2241 return false; 2242 case TIPC_ESTABLISHED: 2243 if (!skb_queue_empty(&sk->sk_write_queue)) 2244 tipc_sk_push_backlog(tsk, false); 2245 /* Accept only connection-based messages sent by peer */ 2246 if (likely(con_msg && !err && pport == oport && 2247 pnode == onode)) { 2248 if (msg_ack_required(hdr)) { 2249 struct sk_buff *skb; 2250 2251 skb = tipc_sk_build_ack(tsk); 2252 if (skb) { 2253 msg_set_nagle_ack(buf_msg(skb)); 2254 __skb_queue_tail(xmitq, skb); 2255 } 2256 } 2257 return true; 2258 } 2259 if (!tsk_peer_msg(tsk, hdr)) 2260 return false; 2261 if (!err) 2262 return true; 2263 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2264 tipc_node_remove_conn(net, pnode, tsk->portid); 2265 sk->sk_state_change(sk); 2266 return true; 2267 default: 2268 pr_err("Unknown sk_state %u\n", sk->sk_state); 2269 } 2270 /* Abort connection setup attempt */ 2271 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2272 sk->sk_err = ECONNREFUSED; 2273 sk->sk_state_change(sk); 2274 return true; 2275 } 2276 2277 /** 2278 * rcvbuf_limit - get proper overload limit of socket receive queue 2279 * @sk: socket 2280 * @skb: message 2281 * 2282 * For connection oriented messages, irrespective of importance, 2283 * default queue limit is 2 MB. 2284 * 2285 * For connectionless messages, queue limits are based on message 2286 * importance as follows: 2287 * 2288 * TIPC_LOW_IMPORTANCE (2 MB) 2289 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2290 * TIPC_HIGH_IMPORTANCE (8 MB) 2291 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2292 * 2293 * Return: overload limit according to corresponding message importance 2294 */ 2295 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2296 { 2297 struct tipc_sock *tsk = tipc_sk(sk); 2298 struct tipc_msg *hdr = buf_msg(skb); 2299 2300 if (unlikely(msg_in_group(hdr))) 2301 return READ_ONCE(sk->sk_rcvbuf); 2302 2303 if (unlikely(!msg_connected(hdr))) 2304 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2305 2306 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2307 return READ_ONCE(sk->sk_rcvbuf); 2308 2309 return FLOWCTL_MSG_LIM; 2310 } 2311 2312 /** 2313 * tipc_sk_filter_rcv - validate incoming message 2314 * @sk: socket 2315 * @skb: pointer to message. 2316 * @xmitq: output message area (FIXME) 2317 * 2318 * Enqueues message on receive queue if acceptable; optionally handles 2319 * disconnect indication for a connected socket. 2320 * 2321 * Called with socket lock already taken 2322 */ 2323 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2324 struct sk_buff_head *xmitq) 2325 { 2326 bool sk_conn = !tipc_sk_type_connectionless(sk); 2327 struct tipc_sock *tsk = tipc_sk(sk); 2328 struct tipc_group *grp = tsk->group; 2329 struct tipc_msg *hdr = buf_msg(skb); 2330 struct net *net = sock_net(sk); 2331 struct sk_buff_head inputq; 2332 int mtyp = msg_type(hdr); 2333 int limit, err = TIPC_OK; 2334 2335 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2336 TIPC_SKB_CB(skb)->bytes_read = 0; 2337 __skb_queue_head_init(&inputq); 2338 __skb_queue_tail(&inputq, skb); 2339 2340 if (unlikely(!msg_isdata(hdr))) 2341 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2342 2343 if (unlikely(grp)) 2344 tipc_group_filter_msg(grp, &inputq, xmitq); 2345 2346 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2347 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2348 2349 /* Validate and add to receive buffer if there is space */ 2350 while ((skb = __skb_dequeue(&inputq))) { 2351 hdr = buf_msg(skb); 2352 limit = rcvbuf_limit(sk, skb); 2353 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2354 (!sk_conn && msg_connected(hdr)) || 2355 (!grp && msg_in_group(hdr))) 2356 err = TIPC_ERR_NO_PORT; 2357 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2358 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2359 "err_overload2!"); 2360 atomic_inc(&sk->sk_drops); 2361 err = TIPC_ERR_OVERLOAD; 2362 } 2363 2364 if (unlikely(err)) { 2365 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2366 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2367 "@filter_rcv!"); 2368 __skb_queue_tail(xmitq, skb); 2369 } 2370 err = TIPC_OK; 2371 continue; 2372 } 2373 __skb_queue_tail(&sk->sk_receive_queue, skb); 2374 skb_set_owner_r(skb, sk); 2375 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2376 "rcvq >90% allocated!"); 2377 sk->sk_data_ready(sk); 2378 } 2379 } 2380 2381 /** 2382 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2383 * @sk: socket 2384 * @skb: message 2385 * 2386 * Caller must hold socket lock 2387 */ 2388 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2389 { 2390 unsigned int before = sk_rmem_alloc_get(sk); 2391 struct sk_buff_head xmitq; 2392 unsigned int added; 2393 2394 __skb_queue_head_init(&xmitq); 2395 2396 tipc_sk_filter_rcv(sk, skb, &xmitq); 2397 added = sk_rmem_alloc_get(sk) - before; 2398 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2399 2400 /* Send pending response/rejected messages, if any */ 2401 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2402 return 0; 2403 } 2404 2405 /** 2406 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2407 * inputq and try adding them to socket or backlog queue 2408 * @inputq: list of incoming buffers with potentially different destinations 2409 * @sk: socket where the buffers should be enqueued 2410 * @dport: port number for the socket 2411 * @xmitq: output queue 2412 * 2413 * Caller must hold socket lock 2414 */ 2415 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2416 u32 dport, struct sk_buff_head *xmitq) 2417 { 2418 unsigned long time_limit = jiffies + 2; 2419 struct sk_buff *skb; 2420 unsigned int lim; 2421 atomic_t *dcnt; 2422 u32 onode; 2423 2424 while (skb_queue_len(inputq)) { 2425 if (unlikely(time_after_eq(jiffies, time_limit))) 2426 return; 2427 2428 skb = tipc_skb_dequeue(inputq, dport); 2429 if (unlikely(!skb)) 2430 return; 2431 2432 /* Add message directly to receive queue if possible */ 2433 if (!sock_owned_by_user(sk)) { 2434 tipc_sk_filter_rcv(sk, skb, xmitq); 2435 continue; 2436 } 2437 2438 /* Try backlog, compensating for double-counted bytes */ 2439 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2440 if (!sk->sk_backlog.len) 2441 atomic_set(dcnt, 0); 2442 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2443 if (likely(!sk_add_backlog(sk, skb, lim))) { 2444 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2445 "bklg & rcvq >90% allocated!"); 2446 continue; 2447 } 2448 2449 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2450 /* Overload => reject message back to sender */ 2451 onode = tipc_own_addr(sock_net(sk)); 2452 atomic_inc(&sk->sk_drops); 2453 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2454 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2455 "@sk_enqueue!"); 2456 __skb_queue_tail(xmitq, skb); 2457 } 2458 break; 2459 } 2460 } 2461 2462 /** 2463 * tipc_sk_rcv - handle a chain of incoming buffers 2464 * @net: the associated network namespace 2465 * @inputq: buffer list containing the buffers 2466 * Consumes all buffers in list until inputq is empty 2467 * Note: may be called in multiple threads referring to the same queue 2468 */ 2469 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2470 { 2471 struct sk_buff_head xmitq; 2472 u32 dnode, dport = 0; 2473 int err; 2474 struct tipc_sock *tsk; 2475 struct sock *sk; 2476 struct sk_buff *skb; 2477 2478 __skb_queue_head_init(&xmitq); 2479 while (skb_queue_len(inputq)) { 2480 dport = tipc_skb_peek_port(inputq, dport); 2481 tsk = tipc_sk_lookup(net, dport); 2482 2483 if (likely(tsk)) { 2484 sk = &tsk->sk; 2485 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2486 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2487 spin_unlock_bh(&sk->sk_lock.slock); 2488 } 2489 /* Send pending response/rejected messages, if any */ 2490 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2491 sock_put(sk); 2492 continue; 2493 } 2494 /* No destination socket => dequeue skb if still there */ 2495 skb = tipc_skb_dequeue(inputq, dport); 2496 if (!skb) 2497 return; 2498 2499 /* Try secondary lookup if unresolved named message */ 2500 err = TIPC_ERR_NO_PORT; 2501 if (tipc_msg_lookup_dest(net, skb, &err)) 2502 goto xmit; 2503 2504 /* Prepare for message rejection */ 2505 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2506 continue; 2507 2508 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2509 xmit: 2510 dnode = msg_destnode(buf_msg(skb)); 2511 tipc_node_xmit_skb(net, skb, dnode, dport); 2512 } 2513 } 2514 2515 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2516 { 2517 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2518 struct sock *sk = sock->sk; 2519 int done; 2520 2521 do { 2522 int err = sock_error(sk); 2523 if (err) 2524 return err; 2525 if (!*timeo_p) 2526 return -ETIMEDOUT; 2527 if (signal_pending(current)) 2528 return sock_intr_errno(*timeo_p); 2529 if (sk->sk_state == TIPC_DISCONNECTING) 2530 break; 2531 2532 add_wait_queue(sk_sleep(sk), &wait); 2533 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2534 &wait); 2535 remove_wait_queue(sk_sleep(sk), &wait); 2536 } while (!done); 2537 return 0; 2538 } 2539 2540 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2541 { 2542 if (addr->family != AF_TIPC) 2543 return false; 2544 if (addr->addrtype == TIPC_SERVICE_RANGE) 2545 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2546 return (addr->addrtype == TIPC_SERVICE_ADDR || 2547 addr->addrtype == TIPC_SOCKET_ADDR); 2548 } 2549 2550 /** 2551 * tipc_connect - establish a connection to another TIPC port 2552 * @sock: socket structure 2553 * @dest: socket address for destination port 2554 * @destlen: size of socket address data structure 2555 * @flags: file-related flags associated with socket 2556 * 2557 * Return: 0 on success, errno otherwise 2558 */ 2559 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2560 int destlen, int flags) 2561 { 2562 struct sock *sk = sock->sk; 2563 struct tipc_sock *tsk = tipc_sk(sk); 2564 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2565 struct msghdr m = {NULL,}; 2566 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2567 int previous; 2568 int res = 0; 2569 2570 if (destlen != sizeof(struct sockaddr_tipc)) 2571 return -EINVAL; 2572 2573 lock_sock(sk); 2574 2575 if (tsk->group) { 2576 res = -EINVAL; 2577 goto exit; 2578 } 2579 2580 if (dst->family == AF_UNSPEC) { 2581 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2582 if (!tipc_sk_type_connectionless(sk)) 2583 res = -EINVAL; 2584 goto exit; 2585 } 2586 if (!tipc_sockaddr_is_sane(dst)) { 2587 res = -EINVAL; 2588 goto exit; 2589 } 2590 /* DGRAM/RDM connect(), just save the destaddr */ 2591 if (tipc_sk_type_connectionless(sk)) { 2592 memcpy(&tsk->peer, dest, destlen); 2593 goto exit; 2594 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2595 res = -EINVAL; 2596 goto exit; 2597 } 2598 2599 previous = sk->sk_state; 2600 2601 switch (sk->sk_state) { 2602 case TIPC_OPEN: 2603 /* Send a 'SYN-' to destination */ 2604 m.msg_name = dest; 2605 m.msg_namelen = destlen; 2606 2607 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2608 * indicate send_msg() is never blocked. 2609 */ 2610 if (!timeout) 2611 m.msg_flags = MSG_DONTWAIT; 2612 2613 res = __tipc_sendmsg(sock, &m, 0); 2614 if ((res < 0) && (res != -EWOULDBLOCK)) 2615 goto exit; 2616 2617 /* Just entered TIPC_CONNECTING state; the only 2618 * difference is that return value in non-blocking 2619 * case is EINPROGRESS, rather than EALREADY. 2620 */ 2621 res = -EINPROGRESS; 2622 fallthrough; 2623 case TIPC_CONNECTING: 2624 if (!timeout) { 2625 if (previous == TIPC_CONNECTING) 2626 res = -EALREADY; 2627 goto exit; 2628 } 2629 timeout = msecs_to_jiffies(timeout); 2630 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2631 res = tipc_wait_for_connect(sock, &timeout); 2632 break; 2633 case TIPC_ESTABLISHED: 2634 res = -EISCONN; 2635 break; 2636 default: 2637 res = -EINVAL; 2638 } 2639 2640 exit: 2641 release_sock(sk); 2642 return res; 2643 } 2644 2645 /** 2646 * tipc_listen - allow socket to listen for incoming connections 2647 * @sock: socket structure 2648 * @len: (unused) 2649 * 2650 * Return: 0 on success, errno otherwise 2651 */ 2652 static int tipc_listen(struct socket *sock, int len) 2653 { 2654 struct sock *sk = sock->sk; 2655 int res; 2656 2657 lock_sock(sk); 2658 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2659 release_sock(sk); 2660 2661 return res; 2662 } 2663 2664 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2665 { 2666 struct sock *sk = sock->sk; 2667 DEFINE_WAIT(wait); 2668 int err; 2669 2670 /* True wake-one mechanism for incoming connections: only 2671 * one process gets woken up, not the 'whole herd'. 2672 * Since we do not 'race & poll' for established sockets 2673 * anymore, the common case will execute the loop only once. 2674 */ 2675 for (;;) { 2676 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 2677 TASK_INTERRUPTIBLE); 2678 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2679 release_sock(sk); 2680 timeo = schedule_timeout(timeo); 2681 lock_sock(sk); 2682 } 2683 err = 0; 2684 if (!skb_queue_empty(&sk->sk_receive_queue)) 2685 break; 2686 err = -EAGAIN; 2687 if (!timeo) 2688 break; 2689 err = sock_intr_errno(timeo); 2690 if (signal_pending(current)) 2691 break; 2692 } 2693 finish_wait(sk_sleep(sk), &wait); 2694 return err; 2695 } 2696 2697 /** 2698 * tipc_accept - wait for connection request 2699 * @sock: listening socket 2700 * @new_sock: new socket that is to be connected 2701 * @flags: file-related flags associated with socket 2702 * @kern: caused by kernel or by userspace? 2703 * 2704 * Return: 0 on success, errno otherwise 2705 */ 2706 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2707 bool kern) 2708 { 2709 struct sock *new_sk, *sk = sock->sk; 2710 struct sk_buff *buf; 2711 struct tipc_sock *new_tsock; 2712 struct tipc_msg *msg; 2713 long timeo; 2714 int res; 2715 2716 lock_sock(sk); 2717 2718 if (sk->sk_state != TIPC_LISTEN) { 2719 res = -EINVAL; 2720 goto exit; 2721 } 2722 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2723 res = tipc_wait_for_accept(sock, timeo); 2724 if (res) 2725 goto exit; 2726 2727 buf = skb_peek(&sk->sk_receive_queue); 2728 2729 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2730 if (res) 2731 goto exit; 2732 security_sk_clone(sock->sk, new_sock->sk); 2733 2734 new_sk = new_sock->sk; 2735 new_tsock = tipc_sk(new_sk); 2736 msg = buf_msg(buf); 2737 2738 /* we lock on new_sk; but lockdep sees the lock on sk */ 2739 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2740 2741 /* 2742 * Reject any stray messages received by new socket 2743 * before the socket lock was taken (very, very unlikely) 2744 */ 2745 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2746 2747 /* Connect new socket to it's peer */ 2748 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2749 2750 tsk_set_importance(new_sk, msg_importance(msg)); 2751 if (msg_named(msg)) { 2752 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR; 2753 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg)); 2754 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg)); 2755 } 2756 2757 /* 2758 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 2759 * Respond to 'SYN+' by queuing it on new socket. 2760 */ 2761 if (!msg_data_sz(msg)) { 2762 struct msghdr m = {NULL,}; 2763 2764 tsk_advance_rx_queue(sk); 2765 __tipc_sendstream(new_sock, &m, 0); 2766 } else { 2767 __skb_dequeue(&sk->sk_receive_queue); 2768 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2769 skb_set_owner_r(buf, new_sk); 2770 } 2771 release_sock(new_sk); 2772 exit: 2773 release_sock(sk); 2774 return res; 2775 } 2776 2777 /** 2778 * tipc_shutdown - shutdown socket connection 2779 * @sock: socket structure 2780 * @how: direction to close (must be SHUT_RDWR) 2781 * 2782 * Terminates connection (if necessary), then purges socket's receive queue. 2783 * 2784 * Return: 0 on success, errno otherwise 2785 */ 2786 static int tipc_shutdown(struct socket *sock, int how) 2787 { 2788 struct sock *sk = sock->sk; 2789 int res; 2790 2791 if (how != SHUT_RDWR) 2792 return -EINVAL; 2793 2794 lock_sock(sk); 2795 2796 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2797 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2798 sk->sk_shutdown = SHUTDOWN_MASK; 2799 2800 if (sk->sk_state == TIPC_DISCONNECTING) { 2801 /* Discard any unreceived messages */ 2802 __skb_queue_purge(&sk->sk_receive_queue); 2803 2804 res = 0; 2805 } else { 2806 res = -ENOTCONN; 2807 } 2808 /* Wake up anyone sleeping in poll. */ 2809 sk->sk_state_change(sk); 2810 2811 release_sock(sk); 2812 return res; 2813 } 2814 2815 static void tipc_sk_check_probing_state(struct sock *sk, 2816 struct sk_buff_head *list) 2817 { 2818 struct tipc_sock *tsk = tipc_sk(sk); 2819 u32 pnode = tsk_peer_node(tsk); 2820 u32 pport = tsk_peer_port(tsk); 2821 u32 self = tsk_own_node(tsk); 2822 u32 oport = tsk->portid; 2823 struct sk_buff *skb; 2824 2825 if (tsk->probe_unacked) { 2826 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2827 sk->sk_err = ECONNABORTED; 2828 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2829 sk->sk_state_change(sk); 2830 return; 2831 } 2832 /* Prepare new probe */ 2833 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2834 pnode, self, pport, oport, TIPC_OK); 2835 if (skb) 2836 __skb_queue_tail(list, skb); 2837 tsk->probe_unacked = true; 2838 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2839 } 2840 2841 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2842 { 2843 struct tipc_sock *tsk = tipc_sk(sk); 2844 2845 /* Try again later if dest link is congested */ 2846 if (tsk->cong_link_cnt) { 2847 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2848 return; 2849 } 2850 /* Prepare SYN for retransmit */ 2851 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2852 } 2853 2854 static void tipc_sk_timeout(struct timer_list *t) 2855 { 2856 struct sock *sk = from_timer(sk, t, sk_timer); 2857 struct tipc_sock *tsk = tipc_sk(sk); 2858 u32 pnode = tsk_peer_node(tsk); 2859 struct sk_buff_head list; 2860 int rc = 0; 2861 2862 __skb_queue_head_init(&list); 2863 bh_lock_sock(sk); 2864 2865 /* Try again later if socket is busy */ 2866 if (sock_owned_by_user(sk)) { 2867 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2868 bh_unlock_sock(sk); 2869 sock_put(sk); 2870 return; 2871 } 2872 2873 if (sk->sk_state == TIPC_ESTABLISHED) 2874 tipc_sk_check_probing_state(sk, &list); 2875 else if (sk->sk_state == TIPC_CONNECTING) 2876 tipc_sk_retry_connect(sk, &list); 2877 2878 bh_unlock_sock(sk); 2879 2880 if (!skb_queue_empty(&list)) 2881 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2882 2883 /* SYN messages may cause link congestion */ 2884 if (rc == -ELINKCONG) { 2885 tipc_dest_push(&tsk->cong_links, pnode, 0); 2886 tsk->cong_link_cnt = 1; 2887 } 2888 sock_put(sk); 2889 } 2890 2891 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2892 { 2893 struct sock *sk = &tsk->sk; 2894 struct net *net = sock_net(sk); 2895 struct tipc_socket_addr skaddr; 2896 struct publication *p; 2897 u32 key; 2898 2899 if (tipc_sk_connected(sk)) 2900 return -EINVAL; 2901 key = tsk->portid + tsk->pub_count + 1; 2902 if (key == tsk->portid) 2903 return -EADDRINUSE; 2904 skaddr.ref = tsk->portid; 2905 skaddr.node = tipc_own_addr(net); 2906 p = tipc_nametbl_publish(net, ua, &skaddr, key); 2907 if (unlikely(!p)) 2908 return -EINVAL; 2909 2910 list_add(&p->binding_sock, &tsk->publications); 2911 tsk->pub_count++; 2912 tsk->published = true; 2913 return 0; 2914 } 2915 2916 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2917 { 2918 struct net *net = sock_net(&tsk->sk); 2919 struct publication *safe, *p; 2920 struct tipc_uaddr _ua; 2921 int rc = -EINVAL; 2922 2923 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) { 2924 if (!ua) { 2925 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope, 2926 p->sr.type, p->sr.lower, p->sr.upper); 2927 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key); 2928 continue; 2929 } 2930 /* Unbind specific publication */ 2931 if (p->scope != ua->scope) 2932 continue; 2933 if (p->sr.type != ua->sr.type) 2934 continue; 2935 if (p->sr.lower != ua->sr.lower) 2936 continue; 2937 if (p->sr.upper != ua->sr.upper) 2938 break; 2939 tipc_nametbl_withdraw(net, ua, &p->sk, p->key); 2940 rc = 0; 2941 break; 2942 } 2943 if (list_empty(&tsk->publications)) { 2944 tsk->published = 0; 2945 rc = 0; 2946 } 2947 return rc; 2948 } 2949 2950 /* tipc_sk_reinit: set non-zero address in all existing sockets 2951 * when we go from standalone to network mode. 2952 */ 2953 void tipc_sk_reinit(struct net *net) 2954 { 2955 struct tipc_net *tn = net_generic(net, tipc_net_id); 2956 struct rhashtable_iter iter; 2957 struct tipc_sock *tsk; 2958 struct tipc_msg *msg; 2959 2960 rhashtable_walk_enter(&tn->sk_rht, &iter); 2961 2962 do { 2963 rhashtable_walk_start(&iter); 2964 2965 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2966 sock_hold(&tsk->sk); 2967 rhashtable_walk_stop(&iter); 2968 lock_sock(&tsk->sk); 2969 msg = &tsk->phdr; 2970 msg_set_prevnode(msg, tipc_own_addr(net)); 2971 msg_set_orignode(msg, tipc_own_addr(net)); 2972 release_sock(&tsk->sk); 2973 rhashtable_walk_start(&iter); 2974 sock_put(&tsk->sk); 2975 } 2976 2977 rhashtable_walk_stop(&iter); 2978 } while (tsk == ERR_PTR(-EAGAIN)); 2979 2980 rhashtable_walk_exit(&iter); 2981 } 2982 2983 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2984 { 2985 struct tipc_net *tn = net_generic(net, tipc_net_id); 2986 struct tipc_sock *tsk; 2987 2988 rcu_read_lock(); 2989 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2990 if (tsk) 2991 sock_hold(&tsk->sk); 2992 rcu_read_unlock(); 2993 2994 return tsk; 2995 } 2996 2997 static int tipc_sk_insert(struct tipc_sock *tsk) 2998 { 2999 struct sock *sk = &tsk->sk; 3000 struct net *net = sock_net(sk); 3001 struct tipc_net *tn = net_generic(net, tipc_net_id); 3002 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 3003 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 3004 3005 while (remaining--) { 3006 portid++; 3007 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 3008 portid = TIPC_MIN_PORT; 3009 tsk->portid = portid; 3010 sock_hold(&tsk->sk); 3011 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 3012 tsk_rht_params)) 3013 return 0; 3014 sock_put(&tsk->sk); 3015 } 3016 3017 return -1; 3018 } 3019 3020 static void tipc_sk_remove(struct tipc_sock *tsk) 3021 { 3022 struct sock *sk = &tsk->sk; 3023 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3024 3025 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3026 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3027 __sock_put(sk); 3028 } 3029 } 3030 3031 static const struct rhashtable_params tsk_rht_params = { 3032 .nelem_hint = 192, 3033 .head_offset = offsetof(struct tipc_sock, node), 3034 .key_offset = offsetof(struct tipc_sock, portid), 3035 .key_len = sizeof(u32), /* portid */ 3036 .max_size = 1048576, 3037 .min_size = 256, 3038 .automatic_shrinking = true, 3039 }; 3040 3041 int tipc_sk_rht_init(struct net *net) 3042 { 3043 struct tipc_net *tn = net_generic(net, tipc_net_id); 3044 3045 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3046 } 3047 3048 void tipc_sk_rht_destroy(struct net *net) 3049 { 3050 struct tipc_net *tn = net_generic(net, tipc_net_id); 3051 3052 /* Wait for socket readers to complete */ 3053 synchronize_net(); 3054 3055 rhashtable_destroy(&tn->sk_rht); 3056 } 3057 3058 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3059 { 3060 struct net *net = sock_net(&tsk->sk); 3061 struct tipc_group *grp = tsk->group; 3062 struct tipc_msg *hdr = &tsk->phdr; 3063 struct tipc_uaddr ua; 3064 int rc; 3065 3066 if (mreq->type < TIPC_RESERVED_TYPES) 3067 return -EACCES; 3068 if (mreq->scope > TIPC_NODE_SCOPE) 3069 return -EINVAL; 3070 if (mreq->scope != TIPC_NODE_SCOPE) 3071 mreq->scope = TIPC_CLUSTER_SCOPE; 3072 if (grp) 3073 return -EACCES; 3074 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3075 if (!grp) 3076 return -ENOMEM; 3077 tsk->group = grp; 3078 msg_set_lookup_scope(hdr, mreq->scope); 3079 msg_set_nametype(hdr, mreq->type); 3080 msg_set_dest_droppable(hdr, true); 3081 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope, 3082 mreq->type, mreq->instance, mreq->instance); 3083 tipc_nametbl_build_group(net, grp, &ua); 3084 rc = tipc_sk_publish(tsk, &ua); 3085 if (rc) { 3086 tipc_group_delete(net, grp); 3087 tsk->group = NULL; 3088 return rc; 3089 } 3090 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3091 tsk->mc_method.rcast = true; 3092 tsk->mc_method.mandatory = true; 3093 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3094 return rc; 3095 } 3096 3097 static int tipc_sk_leave(struct tipc_sock *tsk) 3098 { 3099 struct net *net = sock_net(&tsk->sk); 3100 struct tipc_group *grp = tsk->group; 3101 struct tipc_uaddr ua; 3102 int scope; 3103 3104 if (!grp) 3105 return -EINVAL; 3106 ua.addrtype = TIPC_SERVICE_RANGE; 3107 tipc_group_self(grp, &ua.sr, &scope); 3108 ua.scope = scope; 3109 tipc_group_delete(net, grp); 3110 tsk->group = NULL; 3111 tipc_sk_withdraw(tsk, &ua); 3112 return 0; 3113 } 3114 3115 /** 3116 * tipc_setsockopt - set socket option 3117 * @sock: socket structure 3118 * @lvl: option level 3119 * @opt: option identifier 3120 * @ov: pointer to new option value 3121 * @ol: length of option value 3122 * 3123 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3124 * (to ease compatibility). 3125 * 3126 * Return: 0 on success, errno otherwise 3127 */ 3128 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3129 sockptr_t ov, unsigned int ol) 3130 { 3131 struct sock *sk = sock->sk; 3132 struct tipc_sock *tsk = tipc_sk(sk); 3133 struct tipc_group_req mreq; 3134 u32 value = 0; 3135 int res = 0; 3136 3137 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3138 return 0; 3139 if (lvl != SOL_TIPC) 3140 return -ENOPROTOOPT; 3141 3142 switch (opt) { 3143 case TIPC_IMPORTANCE: 3144 case TIPC_SRC_DROPPABLE: 3145 case TIPC_DEST_DROPPABLE: 3146 case TIPC_CONN_TIMEOUT: 3147 case TIPC_NODELAY: 3148 if (ol < sizeof(value)) 3149 return -EINVAL; 3150 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3151 return -EFAULT; 3152 break; 3153 case TIPC_GROUP_JOIN: 3154 if (ol < sizeof(mreq)) 3155 return -EINVAL; 3156 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3157 return -EFAULT; 3158 break; 3159 default: 3160 if (!sockptr_is_null(ov) || ol) 3161 return -EINVAL; 3162 } 3163 3164 lock_sock(sk); 3165 3166 switch (opt) { 3167 case TIPC_IMPORTANCE: 3168 res = tsk_set_importance(sk, value); 3169 break; 3170 case TIPC_SRC_DROPPABLE: 3171 if (sock->type != SOCK_STREAM) 3172 tsk_set_unreliable(tsk, value); 3173 else 3174 res = -ENOPROTOOPT; 3175 break; 3176 case TIPC_DEST_DROPPABLE: 3177 tsk_set_unreturnable(tsk, value); 3178 break; 3179 case TIPC_CONN_TIMEOUT: 3180 tipc_sk(sk)->conn_timeout = value; 3181 break; 3182 case TIPC_MCAST_BROADCAST: 3183 tsk->mc_method.rcast = false; 3184 tsk->mc_method.mandatory = true; 3185 break; 3186 case TIPC_MCAST_REPLICAST: 3187 tsk->mc_method.rcast = true; 3188 tsk->mc_method.mandatory = true; 3189 break; 3190 case TIPC_GROUP_JOIN: 3191 res = tipc_sk_join(tsk, &mreq); 3192 break; 3193 case TIPC_GROUP_LEAVE: 3194 res = tipc_sk_leave(tsk); 3195 break; 3196 case TIPC_NODELAY: 3197 tsk->nodelay = !!value; 3198 tsk_set_nagle(tsk); 3199 break; 3200 default: 3201 res = -EINVAL; 3202 } 3203 3204 release_sock(sk); 3205 3206 return res; 3207 } 3208 3209 /** 3210 * tipc_getsockopt - get socket option 3211 * @sock: socket structure 3212 * @lvl: option level 3213 * @opt: option identifier 3214 * @ov: receptacle for option value 3215 * @ol: receptacle for length of option value 3216 * 3217 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3218 * (to ease compatibility). 3219 * 3220 * Return: 0 on success, errno otherwise 3221 */ 3222 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3223 char __user *ov, int __user *ol) 3224 { 3225 struct sock *sk = sock->sk; 3226 struct tipc_sock *tsk = tipc_sk(sk); 3227 struct tipc_service_range seq; 3228 int len, scope; 3229 u32 value; 3230 int res; 3231 3232 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3233 return put_user(0, ol); 3234 if (lvl != SOL_TIPC) 3235 return -ENOPROTOOPT; 3236 res = get_user(len, ol); 3237 if (res) 3238 return res; 3239 3240 lock_sock(sk); 3241 3242 switch (opt) { 3243 case TIPC_IMPORTANCE: 3244 value = tsk_importance(tsk); 3245 break; 3246 case TIPC_SRC_DROPPABLE: 3247 value = tsk_unreliable(tsk); 3248 break; 3249 case TIPC_DEST_DROPPABLE: 3250 value = tsk_unreturnable(tsk); 3251 break; 3252 case TIPC_CONN_TIMEOUT: 3253 value = tsk->conn_timeout; 3254 /* no need to set "res", since already 0 at this point */ 3255 break; 3256 case TIPC_NODE_RECVQ_DEPTH: 3257 value = 0; /* was tipc_queue_size, now obsolete */ 3258 break; 3259 case TIPC_SOCK_RECVQ_DEPTH: 3260 value = skb_queue_len(&sk->sk_receive_queue); 3261 break; 3262 case TIPC_SOCK_RECVQ_USED: 3263 value = sk_rmem_alloc_get(sk); 3264 break; 3265 case TIPC_GROUP_JOIN: 3266 seq.type = 0; 3267 if (tsk->group) 3268 tipc_group_self(tsk->group, &seq, &scope); 3269 value = seq.type; 3270 break; 3271 default: 3272 res = -EINVAL; 3273 } 3274 3275 release_sock(sk); 3276 3277 if (res) 3278 return res; /* "get" failed */ 3279 3280 if (len < sizeof(value)) 3281 return -EINVAL; 3282 3283 if (copy_to_user(ov, &value, sizeof(value))) 3284 return -EFAULT; 3285 3286 return put_user(sizeof(value), ol); 3287 } 3288 3289 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3290 { 3291 struct net *net = sock_net(sock->sk); 3292 struct tipc_sioc_nodeid_req nr = {0}; 3293 struct tipc_sioc_ln_req lnr; 3294 void __user *argp = (void __user *)arg; 3295 3296 switch (cmd) { 3297 case SIOCGETLINKNAME: 3298 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3299 return -EFAULT; 3300 if (!tipc_node_get_linkname(net, 3301 lnr.bearer_id & 0xffff, lnr.peer, 3302 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3303 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3304 return -EFAULT; 3305 return 0; 3306 } 3307 return -EADDRNOTAVAIL; 3308 case SIOCGETNODEID: 3309 if (copy_from_user(&nr, argp, sizeof(nr))) 3310 return -EFAULT; 3311 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3312 return -EADDRNOTAVAIL; 3313 if (copy_to_user(argp, &nr, sizeof(nr))) 3314 return -EFAULT; 3315 return 0; 3316 default: 3317 return -ENOIOCTLCMD; 3318 } 3319 } 3320 3321 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3322 { 3323 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3324 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3325 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3326 3327 tsk1->peer.family = AF_TIPC; 3328 tsk1->peer.addrtype = TIPC_SOCKET_ADDR; 3329 tsk1->peer.scope = TIPC_NODE_SCOPE; 3330 tsk1->peer.addr.id.ref = tsk2->portid; 3331 tsk1->peer.addr.id.node = onode; 3332 tsk2->peer.family = AF_TIPC; 3333 tsk2->peer.addrtype = TIPC_SOCKET_ADDR; 3334 tsk2->peer.scope = TIPC_NODE_SCOPE; 3335 tsk2->peer.addr.id.ref = tsk1->portid; 3336 tsk2->peer.addr.id.node = onode; 3337 3338 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3339 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3340 return 0; 3341 } 3342 3343 /* Protocol switches for the various types of TIPC sockets */ 3344 3345 static const struct proto_ops msg_ops = { 3346 .owner = THIS_MODULE, 3347 .family = AF_TIPC, 3348 .release = tipc_release, 3349 .bind = tipc_bind, 3350 .connect = tipc_connect, 3351 .socketpair = tipc_socketpair, 3352 .accept = sock_no_accept, 3353 .getname = tipc_getname, 3354 .poll = tipc_poll, 3355 .ioctl = tipc_ioctl, 3356 .listen = sock_no_listen, 3357 .shutdown = tipc_shutdown, 3358 .setsockopt = tipc_setsockopt, 3359 .getsockopt = tipc_getsockopt, 3360 .sendmsg = tipc_sendmsg, 3361 .recvmsg = tipc_recvmsg, 3362 .mmap = sock_no_mmap, 3363 .sendpage = sock_no_sendpage 3364 }; 3365 3366 static const struct proto_ops packet_ops = { 3367 .owner = THIS_MODULE, 3368 .family = AF_TIPC, 3369 .release = tipc_release, 3370 .bind = tipc_bind, 3371 .connect = tipc_connect, 3372 .socketpair = tipc_socketpair, 3373 .accept = tipc_accept, 3374 .getname = tipc_getname, 3375 .poll = tipc_poll, 3376 .ioctl = tipc_ioctl, 3377 .listen = tipc_listen, 3378 .shutdown = tipc_shutdown, 3379 .setsockopt = tipc_setsockopt, 3380 .getsockopt = tipc_getsockopt, 3381 .sendmsg = tipc_send_packet, 3382 .recvmsg = tipc_recvmsg, 3383 .mmap = sock_no_mmap, 3384 .sendpage = sock_no_sendpage 3385 }; 3386 3387 static const struct proto_ops stream_ops = { 3388 .owner = THIS_MODULE, 3389 .family = AF_TIPC, 3390 .release = tipc_release, 3391 .bind = tipc_bind, 3392 .connect = tipc_connect, 3393 .socketpair = tipc_socketpair, 3394 .accept = tipc_accept, 3395 .getname = tipc_getname, 3396 .poll = tipc_poll, 3397 .ioctl = tipc_ioctl, 3398 .listen = tipc_listen, 3399 .shutdown = tipc_shutdown, 3400 .setsockopt = tipc_setsockopt, 3401 .getsockopt = tipc_getsockopt, 3402 .sendmsg = tipc_sendstream, 3403 .recvmsg = tipc_recvstream, 3404 .mmap = sock_no_mmap, 3405 .sendpage = sock_no_sendpage 3406 }; 3407 3408 static const struct net_proto_family tipc_family_ops = { 3409 .owner = THIS_MODULE, 3410 .family = AF_TIPC, 3411 .create = tipc_sk_create 3412 }; 3413 3414 static struct proto tipc_proto = { 3415 .name = "TIPC", 3416 .owner = THIS_MODULE, 3417 .obj_size = sizeof(struct tipc_sock), 3418 .sysctl_rmem = sysctl_tipc_rmem 3419 }; 3420 3421 /** 3422 * tipc_socket_init - initialize TIPC socket interface 3423 * 3424 * Return: 0 on success, errno otherwise 3425 */ 3426 int tipc_socket_init(void) 3427 { 3428 int res; 3429 3430 res = proto_register(&tipc_proto, 1); 3431 if (res) { 3432 pr_err("Failed to register TIPC protocol type\n"); 3433 goto out; 3434 } 3435 3436 res = sock_register(&tipc_family_ops); 3437 if (res) { 3438 pr_err("Failed to register TIPC socket type\n"); 3439 proto_unregister(&tipc_proto); 3440 goto out; 3441 } 3442 out: 3443 return res; 3444 } 3445 3446 /** 3447 * tipc_socket_stop - stop TIPC socket interface 3448 */ 3449 void tipc_socket_stop(void) 3450 { 3451 sock_unregister(tipc_family_ops.family); 3452 proto_unregister(&tipc_proto); 3453 } 3454 3455 /* Caller should hold socket lock for the passed tipc socket. */ 3456 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3457 { 3458 u32 peer_node, peer_port; 3459 u32 conn_type, conn_instance; 3460 struct nlattr *nest; 3461 3462 peer_node = tsk_peer_node(tsk); 3463 peer_port = tsk_peer_port(tsk); 3464 conn_type = msg_nametype(&tsk->phdr); 3465 conn_instance = msg_nameinst(&tsk->phdr); 3466 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3467 if (!nest) 3468 return -EMSGSIZE; 3469 3470 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3471 goto msg_full; 3472 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3473 goto msg_full; 3474 3475 if (tsk->conn_addrtype != 0) { 3476 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3477 goto msg_full; 3478 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type)) 3479 goto msg_full; 3480 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance)) 3481 goto msg_full; 3482 } 3483 nla_nest_end(skb, nest); 3484 3485 return 0; 3486 3487 msg_full: 3488 nla_nest_cancel(skb, nest); 3489 3490 return -EMSGSIZE; 3491 } 3492 3493 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3494 *tsk) 3495 { 3496 struct net *net = sock_net(skb->sk); 3497 struct sock *sk = &tsk->sk; 3498 3499 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3500 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3501 return -EMSGSIZE; 3502 3503 if (tipc_sk_connected(sk)) { 3504 if (__tipc_nl_add_sk_con(skb, tsk)) 3505 return -EMSGSIZE; 3506 } else if (!list_empty(&tsk->publications)) { 3507 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3508 return -EMSGSIZE; 3509 } 3510 return 0; 3511 } 3512 3513 /* Caller should hold socket lock for the passed tipc socket. */ 3514 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3515 struct tipc_sock *tsk) 3516 { 3517 struct nlattr *attrs; 3518 void *hdr; 3519 3520 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3521 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3522 if (!hdr) 3523 goto msg_cancel; 3524 3525 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3526 if (!attrs) 3527 goto genlmsg_cancel; 3528 3529 if (__tipc_nl_add_sk_info(skb, tsk)) 3530 goto attr_msg_cancel; 3531 3532 nla_nest_end(skb, attrs); 3533 genlmsg_end(skb, hdr); 3534 3535 return 0; 3536 3537 attr_msg_cancel: 3538 nla_nest_cancel(skb, attrs); 3539 genlmsg_cancel: 3540 genlmsg_cancel(skb, hdr); 3541 msg_cancel: 3542 return -EMSGSIZE; 3543 } 3544 3545 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3546 int (*skb_handler)(struct sk_buff *skb, 3547 struct netlink_callback *cb, 3548 struct tipc_sock *tsk)) 3549 { 3550 struct rhashtable_iter *iter = (void *)cb->args[4]; 3551 struct tipc_sock *tsk; 3552 int err; 3553 3554 rhashtable_walk_start(iter); 3555 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3556 if (IS_ERR(tsk)) { 3557 err = PTR_ERR(tsk); 3558 if (err == -EAGAIN) { 3559 err = 0; 3560 continue; 3561 } 3562 break; 3563 } 3564 3565 sock_hold(&tsk->sk); 3566 rhashtable_walk_stop(iter); 3567 lock_sock(&tsk->sk); 3568 err = skb_handler(skb, cb, tsk); 3569 if (err) { 3570 release_sock(&tsk->sk); 3571 sock_put(&tsk->sk); 3572 goto out; 3573 } 3574 release_sock(&tsk->sk); 3575 rhashtable_walk_start(iter); 3576 sock_put(&tsk->sk); 3577 } 3578 rhashtable_walk_stop(iter); 3579 out: 3580 return skb->len; 3581 } 3582 EXPORT_SYMBOL(tipc_nl_sk_walk); 3583 3584 int tipc_dump_start(struct netlink_callback *cb) 3585 { 3586 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3587 } 3588 EXPORT_SYMBOL(tipc_dump_start); 3589 3590 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3591 { 3592 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3593 struct rhashtable_iter *iter = (void *)cb->args[4]; 3594 struct tipc_net *tn = tipc_net(net); 3595 3596 if (!iter) { 3597 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3598 if (!iter) 3599 return -ENOMEM; 3600 3601 cb->args[4] = (long)iter; 3602 } 3603 3604 rhashtable_walk_enter(&tn->sk_rht, iter); 3605 return 0; 3606 } 3607 3608 int tipc_dump_done(struct netlink_callback *cb) 3609 { 3610 struct rhashtable_iter *hti = (void *)cb->args[4]; 3611 3612 rhashtable_walk_exit(hti); 3613 kfree(hti); 3614 return 0; 3615 } 3616 EXPORT_SYMBOL(tipc_dump_done); 3617 3618 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3619 struct tipc_sock *tsk, u32 sk_filter_state, 3620 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3621 { 3622 struct sock *sk = &tsk->sk; 3623 struct nlattr *attrs; 3624 struct nlattr *stat; 3625 3626 /*filter response w.r.t sk_state*/ 3627 if (!(sk_filter_state & (1 << sk->sk_state))) 3628 return 0; 3629 3630 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3631 if (!attrs) 3632 goto msg_cancel; 3633 3634 if (__tipc_nl_add_sk_info(skb, tsk)) 3635 goto attr_msg_cancel; 3636 3637 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3638 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3639 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3640 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3641 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3642 sock_i_uid(sk))) || 3643 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3644 tipc_diag_gen_cookie(sk), 3645 TIPC_NLA_SOCK_PAD)) 3646 goto attr_msg_cancel; 3647 3648 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3649 if (!stat) 3650 goto attr_msg_cancel; 3651 3652 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3653 skb_queue_len(&sk->sk_receive_queue)) || 3654 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3655 skb_queue_len(&sk->sk_write_queue)) || 3656 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3657 atomic_read(&sk->sk_drops))) 3658 goto stat_msg_cancel; 3659 3660 if (tsk->cong_link_cnt && 3661 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3662 goto stat_msg_cancel; 3663 3664 if (tsk_conn_cong(tsk) && 3665 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3666 goto stat_msg_cancel; 3667 3668 nla_nest_end(skb, stat); 3669 3670 if (tsk->group) 3671 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3672 goto stat_msg_cancel; 3673 3674 nla_nest_end(skb, attrs); 3675 3676 return 0; 3677 3678 stat_msg_cancel: 3679 nla_nest_cancel(skb, stat); 3680 attr_msg_cancel: 3681 nla_nest_cancel(skb, attrs); 3682 msg_cancel: 3683 return -EMSGSIZE; 3684 } 3685 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3686 3687 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3688 { 3689 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3690 } 3691 3692 /* Caller should hold socket lock for the passed tipc socket. */ 3693 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3694 struct netlink_callback *cb, 3695 struct publication *publ) 3696 { 3697 void *hdr; 3698 struct nlattr *attrs; 3699 3700 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3701 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3702 if (!hdr) 3703 goto msg_cancel; 3704 3705 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3706 if (!attrs) 3707 goto genlmsg_cancel; 3708 3709 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3710 goto attr_msg_cancel; 3711 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type)) 3712 goto attr_msg_cancel; 3713 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower)) 3714 goto attr_msg_cancel; 3715 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper)) 3716 goto attr_msg_cancel; 3717 3718 nla_nest_end(skb, attrs); 3719 genlmsg_end(skb, hdr); 3720 3721 return 0; 3722 3723 attr_msg_cancel: 3724 nla_nest_cancel(skb, attrs); 3725 genlmsg_cancel: 3726 genlmsg_cancel(skb, hdr); 3727 msg_cancel: 3728 return -EMSGSIZE; 3729 } 3730 3731 /* Caller should hold socket lock for the passed tipc socket. */ 3732 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3733 struct netlink_callback *cb, 3734 struct tipc_sock *tsk, u32 *last_publ) 3735 { 3736 int err; 3737 struct publication *p; 3738 3739 if (*last_publ) { 3740 list_for_each_entry(p, &tsk->publications, binding_sock) { 3741 if (p->key == *last_publ) 3742 break; 3743 } 3744 if (p->key != *last_publ) { 3745 /* We never set seq or call nl_dump_check_consistent() 3746 * this means that setting prev_seq here will cause the 3747 * consistence check to fail in the netlink callback 3748 * handler. Resulting in the last NLMSG_DONE message 3749 * having the NLM_F_DUMP_INTR flag set. 3750 */ 3751 cb->prev_seq = 1; 3752 *last_publ = 0; 3753 return -EPIPE; 3754 } 3755 } else { 3756 p = list_first_entry(&tsk->publications, struct publication, 3757 binding_sock); 3758 } 3759 3760 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3761 err = __tipc_nl_add_sk_publ(skb, cb, p); 3762 if (err) { 3763 *last_publ = p->key; 3764 return err; 3765 } 3766 } 3767 *last_publ = 0; 3768 3769 return 0; 3770 } 3771 3772 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3773 { 3774 int err; 3775 u32 tsk_portid = cb->args[0]; 3776 u32 last_publ = cb->args[1]; 3777 u32 done = cb->args[2]; 3778 struct net *net = sock_net(skb->sk); 3779 struct tipc_sock *tsk; 3780 3781 if (!tsk_portid) { 3782 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3783 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3784 3785 if (!attrs[TIPC_NLA_SOCK]) 3786 return -EINVAL; 3787 3788 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3789 attrs[TIPC_NLA_SOCK], 3790 tipc_nl_sock_policy, NULL); 3791 if (err) 3792 return err; 3793 3794 if (!sock[TIPC_NLA_SOCK_REF]) 3795 return -EINVAL; 3796 3797 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3798 } 3799 3800 if (done) 3801 return 0; 3802 3803 tsk = tipc_sk_lookup(net, tsk_portid); 3804 if (!tsk) 3805 return -EINVAL; 3806 3807 lock_sock(&tsk->sk); 3808 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3809 if (!err) 3810 done = 1; 3811 release_sock(&tsk->sk); 3812 sock_put(&tsk->sk); 3813 3814 cb->args[0] = tsk_portid; 3815 cb->args[1] = last_publ; 3816 cb->args[2] = done; 3817 3818 return skb->len; 3819 } 3820 3821 /** 3822 * tipc_sk_filtering - check if a socket should be traced 3823 * @sk: the socket to be examined 3824 * 3825 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering: 3826 * (portid, sock type, name type, name lower, name upper) 3827 * 3828 * Return: true if the socket meets the socket tuple data 3829 * (value 0 = 'any') or when there is no tuple set (all = 0), 3830 * otherwise false 3831 */ 3832 bool tipc_sk_filtering(struct sock *sk) 3833 { 3834 struct tipc_sock *tsk; 3835 struct publication *p; 3836 u32 _port, _sktype, _type, _lower, _upper; 3837 u32 type = 0, lower = 0, upper = 0; 3838 3839 if (!sk) 3840 return true; 3841 3842 tsk = tipc_sk(sk); 3843 3844 _port = sysctl_tipc_sk_filter[0]; 3845 _sktype = sysctl_tipc_sk_filter[1]; 3846 _type = sysctl_tipc_sk_filter[2]; 3847 _lower = sysctl_tipc_sk_filter[3]; 3848 _upper = sysctl_tipc_sk_filter[4]; 3849 3850 if (!_port && !_sktype && !_type && !_lower && !_upper) 3851 return true; 3852 3853 if (_port) 3854 return (_port == tsk->portid); 3855 3856 if (_sktype && _sktype != sk->sk_type) 3857 return false; 3858 3859 if (tsk->published) { 3860 p = list_first_entry_or_null(&tsk->publications, 3861 struct publication, binding_sock); 3862 if (p) { 3863 type = p->sr.type; 3864 lower = p->sr.lower; 3865 upper = p->sr.upper; 3866 } 3867 } 3868 3869 if (!tipc_sk_type_connectionless(sk)) { 3870 type = msg_nametype(&tsk->phdr); 3871 lower = msg_nameinst(&tsk->phdr); 3872 upper = lower; 3873 } 3874 3875 if ((_type && _type != type) || (_lower && _lower != lower) || 3876 (_upper && _upper != upper)) 3877 return false; 3878 3879 return true; 3880 } 3881 3882 u32 tipc_sock_get_portid(struct sock *sk) 3883 { 3884 return (sk) ? (tipc_sk(sk))->portid : 0; 3885 } 3886 3887 /** 3888 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3889 * both the rcv and backlog queues are considered 3890 * @sk: tipc sk to be checked 3891 * @skb: tipc msg to be checked 3892 * 3893 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3894 */ 3895 3896 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3897 { 3898 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3899 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3900 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3901 3902 return (qsize > lim * 90 / 100); 3903 } 3904 3905 /** 3906 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3907 * only the rcv queue is considered 3908 * @sk: tipc sk to be checked 3909 * @skb: tipc msg to be checked 3910 * 3911 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3912 */ 3913 3914 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3915 { 3916 unsigned int lim = rcvbuf_limit(sk, skb); 3917 unsigned int qsize = sk_rmem_alloc_get(sk); 3918 3919 return (qsize > lim * 90 / 100); 3920 } 3921 3922 /** 3923 * tipc_sk_dump - dump TIPC socket 3924 * @sk: tipc sk to be dumped 3925 * @dqueues: bitmask to decide if any socket queue to be dumped? 3926 * - TIPC_DUMP_NONE: don't dump socket queues 3927 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3928 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3929 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3930 * - TIPC_DUMP_ALL: dump all the socket queues above 3931 * @buf: returned buffer of dump data in format 3932 */ 3933 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3934 { 3935 int i = 0; 3936 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3937 u32 conn_type, conn_instance; 3938 struct tipc_sock *tsk; 3939 struct publication *p; 3940 bool tsk_connected; 3941 3942 if (!sk) { 3943 i += scnprintf(buf, sz, "sk data: (null)\n"); 3944 return i; 3945 } 3946 3947 tsk = tipc_sk(sk); 3948 tsk_connected = !tipc_sk_type_connectionless(sk); 3949 3950 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3951 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3952 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3953 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3954 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3955 if (tsk_connected) { 3956 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3957 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3958 conn_type = msg_nametype(&tsk->phdr); 3959 conn_instance = msg_nameinst(&tsk->phdr); 3960 i += scnprintf(buf + i, sz - i, " %u", conn_type); 3961 i += scnprintf(buf + i, sz - i, " %u", conn_instance); 3962 } 3963 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3964 if (tsk->published) { 3965 p = list_first_entry_or_null(&tsk->publications, 3966 struct publication, binding_sock); 3967 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0); 3968 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0); 3969 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0); 3970 } 3971 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3972 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3973 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3974 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3975 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3976 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3977 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3978 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3979 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3980 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3981 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3982 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3983 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3984 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3985 3986 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3987 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3988 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3989 } 3990 3991 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3992 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3993 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3994 } 3995 3996 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 3997 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 3998 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 3999 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 4000 i += scnprintf(buf + i, sz - i, " tail "); 4001 i += tipc_skb_dump(sk->sk_backlog.tail, false, 4002 buf + i); 4003 } 4004 } 4005 4006 return i; 4007 } 4008