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 sk_buff_head xmitq; 1884 struct tipc_msg *hdr; 1885 struct sk_buff *skb; 1886 bool grp_evt; 1887 long timeout; 1888 1889 /* Catch invalid receive requests */ 1890 if (unlikely(!buflen)) 1891 return -EINVAL; 1892 1893 lock_sock(sk); 1894 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1895 rc = -ENOTCONN; 1896 goto exit; 1897 } 1898 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1899 1900 /* Step rcv queue to first msg with data or error; wait if necessary */ 1901 do { 1902 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1903 if (unlikely(rc)) 1904 goto exit; 1905 skb = skb_peek(&sk->sk_receive_queue); 1906 hdr = buf_msg(skb); 1907 dlen = msg_data_sz(hdr); 1908 hlen = msg_hdr_sz(hdr); 1909 err = msg_errcode(hdr); 1910 grp_evt = msg_is_grp_evt(hdr); 1911 if (likely(dlen || err)) 1912 break; 1913 tsk_advance_rx_queue(sk); 1914 } while (1); 1915 1916 /* Collect msg meta data, including error code and rejected data */ 1917 tipc_sk_set_orig_addr(m, skb); 1918 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1919 if (unlikely(rc)) 1920 goto exit; 1921 hdr = buf_msg(skb); 1922 1923 /* Capture data if non-error msg, otherwise just set return value */ 1924 if (likely(!err)) { 1925 copy = min_t(int, dlen, buflen); 1926 if (unlikely(copy != dlen)) 1927 m->msg_flags |= MSG_TRUNC; 1928 rc = skb_copy_datagram_msg(skb, hlen, m, copy); 1929 } else { 1930 copy = 0; 1931 rc = 0; 1932 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) 1933 rc = -ECONNRESET; 1934 } 1935 if (unlikely(rc)) 1936 goto exit; 1937 1938 /* Mark message as group event if applicable */ 1939 if (unlikely(grp_evt)) { 1940 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1941 m->msg_flags |= MSG_EOR; 1942 m->msg_flags |= MSG_OOB; 1943 copy = 0; 1944 } 1945 1946 /* Caption of data or error code/rejected data was successful */ 1947 if (unlikely(flags & MSG_PEEK)) 1948 goto exit; 1949 1950 /* Send group flow control advertisement when applicable */ 1951 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1952 __skb_queue_head_init(&xmitq); 1953 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1954 msg_orignode(hdr), msg_origport(hdr), 1955 &xmitq); 1956 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1957 } 1958 1959 tsk_advance_rx_queue(sk); 1960 1961 if (likely(!connected)) 1962 goto exit; 1963 1964 /* Send connection flow control advertisement when applicable */ 1965 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1966 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1967 tipc_sk_send_ack(tsk); 1968 exit: 1969 release_sock(sk); 1970 return rc ? rc : copy; 1971 } 1972 1973 /** 1974 * tipc_recvstream - receive stream-oriented data 1975 * @sock: network socket 1976 * @m: descriptor for message info 1977 * @buflen: total size of user buffer area 1978 * @flags: receive flags 1979 * 1980 * Used for SOCK_STREAM messages only. If not enough data is available 1981 * will optionally wait for more; never truncates data. 1982 * 1983 * Return: size of returned message data, errno otherwise 1984 */ 1985 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 1986 size_t buflen, int flags) 1987 { 1988 struct sock *sk = sock->sk; 1989 struct tipc_sock *tsk = tipc_sk(sk); 1990 struct sk_buff *skb; 1991 struct tipc_msg *hdr; 1992 struct tipc_skb_cb *skb_cb; 1993 bool peek = flags & MSG_PEEK; 1994 int offset, required, copy, copied = 0; 1995 int hlen, dlen, err, rc; 1996 long timeout; 1997 1998 /* Catch invalid receive attempts */ 1999 if (unlikely(!buflen)) 2000 return -EINVAL; 2001 2002 lock_sock(sk); 2003 2004 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2005 rc = -ENOTCONN; 2006 goto exit; 2007 } 2008 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2009 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2010 2011 do { 2012 /* Look at first msg in receive queue; wait if necessary */ 2013 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2014 if (unlikely(rc)) 2015 break; 2016 skb = skb_peek(&sk->sk_receive_queue); 2017 skb_cb = TIPC_SKB_CB(skb); 2018 hdr = buf_msg(skb); 2019 dlen = msg_data_sz(hdr); 2020 hlen = msg_hdr_sz(hdr); 2021 err = msg_errcode(hdr); 2022 2023 /* Discard any empty non-errored (SYN-) message */ 2024 if (unlikely(!dlen && !err)) { 2025 tsk_advance_rx_queue(sk); 2026 continue; 2027 } 2028 2029 /* Collect msg meta data, incl. error code and rejected data */ 2030 if (!copied) { 2031 tipc_sk_set_orig_addr(m, skb); 2032 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2033 if (rc) 2034 break; 2035 hdr = buf_msg(skb); 2036 } 2037 2038 /* Copy data if msg ok, otherwise return error/partial data */ 2039 if (likely(!err)) { 2040 offset = skb_cb->bytes_read; 2041 copy = min_t(int, dlen - offset, buflen - copied); 2042 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2043 if (unlikely(rc)) 2044 break; 2045 copied += copy; 2046 offset += copy; 2047 if (unlikely(offset < dlen)) { 2048 if (!peek) 2049 skb_cb->bytes_read = offset; 2050 break; 2051 } 2052 } else { 2053 rc = 0; 2054 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2055 rc = -ECONNRESET; 2056 if (copied || rc) 2057 break; 2058 } 2059 2060 if (unlikely(peek)) 2061 break; 2062 2063 tsk_advance_rx_queue(sk); 2064 2065 /* Send connection flow control advertisement when applicable */ 2066 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2067 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2068 tipc_sk_send_ack(tsk); 2069 2070 /* Exit if all requested data or FIN/error received */ 2071 if (copied == buflen || err) 2072 break; 2073 2074 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2075 exit: 2076 release_sock(sk); 2077 return copied ? copied : rc; 2078 } 2079 2080 /** 2081 * tipc_write_space - wake up thread if port congestion is released 2082 * @sk: socket 2083 */ 2084 static void tipc_write_space(struct sock *sk) 2085 { 2086 struct socket_wq *wq; 2087 2088 rcu_read_lock(); 2089 wq = rcu_dereference(sk->sk_wq); 2090 if (skwq_has_sleeper(wq)) 2091 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2092 EPOLLWRNORM | EPOLLWRBAND); 2093 rcu_read_unlock(); 2094 } 2095 2096 /** 2097 * tipc_data_ready - wake up threads to indicate messages have been received 2098 * @sk: socket 2099 */ 2100 static void tipc_data_ready(struct sock *sk) 2101 { 2102 struct socket_wq *wq; 2103 2104 rcu_read_lock(); 2105 wq = rcu_dereference(sk->sk_wq); 2106 if (skwq_has_sleeper(wq)) 2107 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2108 EPOLLRDNORM | EPOLLRDBAND); 2109 rcu_read_unlock(); 2110 } 2111 2112 static void tipc_sock_destruct(struct sock *sk) 2113 { 2114 __skb_queue_purge(&sk->sk_receive_queue); 2115 } 2116 2117 static void tipc_sk_proto_rcv(struct sock *sk, 2118 struct sk_buff_head *inputq, 2119 struct sk_buff_head *xmitq) 2120 { 2121 struct sk_buff *skb = __skb_dequeue(inputq); 2122 struct tipc_sock *tsk = tipc_sk(sk); 2123 struct tipc_msg *hdr = buf_msg(skb); 2124 struct tipc_group *grp = tsk->group; 2125 bool wakeup = false; 2126 2127 switch (msg_user(hdr)) { 2128 case CONN_MANAGER: 2129 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2130 return; 2131 case SOCK_WAKEUP: 2132 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2133 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2134 smp_wmb(); 2135 tsk->cong_link_cnt--; 2136 wakeup = true; 2137 tipc_sk_push_backlog(tsk, false); 2138 break; 2139 case GROUP_PROTOCOL: 2140 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2141 break; 2142 case TOP_SRV: 2143 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2144 hdr, inputq, xmitq); 2145 break; 2146 default: 2147 break; 2148 } 2149 2150 if (wakeup) 2151 sk->sk_write_space(sk); 2152 2153 kfree_skb(skb); 2154 } 2155 2156 /** 2157 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2158 * @tsk: TIPC socket 2159 * @skb: pointer to message buffer. 2160 * @xmitq: for Nagle ACK if any 2161 * Return: true if message should be added to receive queue, false otherwise 2162 */ 2163 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2164 struct sk_buff_head *xmitq) 2165 { 2166 struct sock *sk = &tsk->sk; 2167 struct net *net = sock_net(sk); 2168 struct tipc_msg *hdr = buf_msg(skb); 2169 bool con_msg = msg_connected(hdr); 2170 u32 pport = tsk_peer_port(tsk); 2171 u32 pnode = tsk_peer_node(tsk); 2172 u32 oport = msg_origport(hdr); 2173 u32 onode = msg_orignode(hdr); 2174 int err = msg_errcode(hdr); 2175 unsigned long delay; 2176 2177 if (unlikely(msg_mcast(hdr))) 2178 return false; 2179 tsk->oneway = 0; 2180 2181 switch (sk->sk_state) { 2182 case TIPC_CONNECTING: 2183 /* Setup ACK */ 2184 if (likely(con_msg)) { 2185 if (err) 2186 break; 2187 tipc_sk_finish_conn(tsk, oport, onode); 2188 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2189 /* ACK+ message with data is added to receive queue */ 2190 if (msg_data_sz(hdr)) 2191 return true; 2192 /* Empty ACK-, - wake up sleeping connect() and drop */ 2193 sk->sk_state_change(sk); 2194 msg_set_dest_droppable(hdr, 1); 2195 return false; 2196 } 2197 /* Ignore connectionless message if not from listening socket */ 2198 if (oport != pport || onode != pnode) 2199 return false; 2200 2201 /* Rejected SYN */ 2202 if (err != TIPC_ERR_OVERLOAD) 2203 break; 2204 2205 /* Prepare for new setup attempt if we have a SYN clone */ 2206 if (skb_queue_empty(&sk->sk_write_queue)) 2207 break; 2208 get_random_bytes(&delay, 2); 2209 delay %= (tsk->conn_timeout / 4); 2210 delay = msecs_to_jiffies(delay + 100); 2211 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2212 return false; 2213 case TIPC_OPEN: 2214 case TIPC_DISCONNECTING: 2215 return false; 2216 case TIPC_LISTEN: 2217 /* Accept only SYN message */ 2218 if (!msg_is_syn(hdr) && 2219 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2220 return false; 2221 if (!con_msg && !err) 2222 return true; 2223 return false; 2224 case TIPC_ESTABLISHED: 2225 if (!skb_queue_empty(&sk->sk_write_queue)) 2226 tipc_sk_push_backlog(tsk, false); 2227 /* Accept only connection-based messages sent by peer */ 2228 if (likely(con_msg && !err && pport == oport && 2229 pnode == onode)) { 2230 if (msg_ack_required(hdr)) { 2231 struct sk_buff *skb; 2232 2233 skb = tipc_sk_build_ack(tsk); 2234 if (skb) { 2235 msg_set_nagle_ack(buf_msg(skb)); 2236 __skb_queue_tail(xmitq, skb); 2237 } 2238 } 2239 return true; 2240 } 2241 if (!tsk_peer_msg(tsk, hdr)) 2242 return false; 2243 if (!err) 2244 return true; 2245 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2246 tipc_node_remove_conn(net, pnode, tsk->portid); 2247 sk->sk_state_change(sk); 2248 return true; 2249 default: 2250 pr_err("Unknown sk_state %u\n", sk->sk_state); 2251 } 2252 /* Abort connection setup attempt */ 2253 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2254 sk->sk_err = ECONNREFUSED; 2255 sk->sk_state_change(sk); 2256 return true; 2257 } 2258 2259 /** 2260 * rcvbuf_limit - get proper overload limit of socket receive queue 2261 * @sk: socket 2262 * @skb: message 2263 * 2264 * For connection oriented messages, irrespective of importance, 2265 * default queue limit is 2 MB. 2266 * 2267 * For connectionless messages, queue limits are based on message 2268 * importance as follows: 2269 * 2270 * TIPC_LOW_IMPORTANCE (2 MB) 2271 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2272 * TIPC_HIGH_IMPORTANCE (8 MB) 2273 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2274 * 2275 * Return: overload limit according to corresponding message importance 2276 */ 2277 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2278 { 2279 struct tipc_sock *tsk = tipc_sk(sk); 2280 struct tipc_msg *hdr = buf_msg(skb); 2281 2282 if (unlikely(msg_in_group(hdr))) 2283 return READ_ONCE(sk->sk_rcvbuf); 2284 2285 if (unlikely(!msg_connected(hdr))) 2286 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2287 2288 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2289 return READ_ONCE(sk->sk_rcvbuf); 2290 2291 return FLOWCTL_MSG_LIM; 2292 } 2293 2294 /** 2295 * tipc_sk_filter_rcv - validate incoming message 2296 * @sk: socket 2297 * @skb: pointer to message. 2298 * @xmitq: output message area (FIXME) 2299 * 2300 * Enqueues message on receive queue if acceptable; optionally handles 2301 * disconnect indication for a connected socket. 2302 * 2303 * Called with socket lock already taken 2304 */ 2305 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2306 struct sk_buff_head *xmitq) 2307 { 2308 bool sk_conn = !tipc_sk_type_connectionless(sk); 2309 struct tipc_sock *tsk = tipc_sk(sk); 2310 struct tipc_group *grp = tsk->group; 2311 struct tipc_msg *hdr = buf_msg(skb); 2312 struct net *net = sock_net(sk); 2313 struct sk_buff_head inputq; 2314 int mtyp = msg_type(hdr); 2315 int limit, err = TIPC_OK; 2316 2317 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2318 TIPC_SKB_CB(skb)->bytes_read = 0; 2319 __skb_queue_head_init(&inputq); 2320 __skb_queue_tail(&inputq, skb); 2321 2322 if (unlikely(!msg_isdata(hdr))) 2323 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2324 2325 if (unlikely(grp)) 2326 tipc_group_filter_msg(grp, &inputq, xmitq); 2327 2328 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2329 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2330 2331 /* Validate and add to receive buffer if there is space */ 2332 while ((skb = __skb_dequeue(&inputq))) { 2333 hdr = buf_msg(skb); 2334 limit = rcvbuf_limit(sk, skb); 2335 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2336 (!sk_conn && msg_connected(hdr)) || 2337 (!grp && msg_in_group(hdr))) 2338 err = TIPC_ERR_NO_PORT; 2339 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2340 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2341 "err_overload2!"); 2342 atomic_inc(&sk->sk_drops); 2343 err = TIPC_ERR_OVERLOAD; 2344 } 2345 2346 if (unlikely(err)) { 2347 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2348 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2349 "@filter_rcv!"); 2350 __skb_queue_tail(xmitq, skb); 2351 } 2352 err = TIPC_OK; 2353 continue; 2354 } 2355 __skb_queue_tail(&sk->sk_receive_queue, skb); 2356 skb_set_owner_r(skb, sk); 2357 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2358 "rcvq >90% allocated!"); 2359 sk->sk_data_ready(sk); 2360 } 2361 } 2362 2363 /** 2364 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2365 * @sk: socket 2366 * @skb: message 2367 * 2368 * Caller must hold socket lock 2369 */ 2370 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2371 { 2372 unsigned int before = sk_rmem_alloc_get(sk); 2373 struct sk_buff_head xmitq; 2374 unsigned int added; 2375 2376 __skb_queue_head_init(&xmitq); 2377 2378 tipc_sk_filter_rcv(sk, skb, &xmitq); 2379 added = sk_rmem_alloc_get(sk) - before; 2380 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2381 2382 /* Send pending response/rejected messages, if any */ 2383 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2384 return 0; 2385 } 2386 2387 /** 2388 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2389 * inputq and try adding them to socket or backlog queue 2390 * @inputq: list of incoming buffers with potentially different destinations 2391 * @sk: socket where the buffers should be enqueued 2392 * @dport: port number for the socket 2393 * @xmitq: output queue 2394 * 2395 * Caller must hold socket lock 2396 */ 2397 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2398 u32 dport, struct sk_buff_head *xmitq) 2399 { 2400 unsigned long time_limit = jiffies + 2; 2401 struct sk_buff *skb; 2402 unsigned int lim; 2403 atomic_t *dcnt; 2404 u32 onode; 2405 2406 while (skb_queue_len(inputq)) { 2407 if (unlikely(time_after_eq(jiffies, time_limit))) 2408 return; 2409 2410 skb = tipc_skb_dequeue(inputq, dport); 2411 if (unlikely(!skb)) 2412 return; 2413 2414 /* Add message directly to receive queue if possible */ 2415 if (!sock_owned_by_user(sk)) { 2416 tipc_sk_filter_rcv(sk, skb, xmitq); 2417 continue; 2418 } 2419 2420 /* Try backlog, compensating for double-counted bytes */ 2421 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2422 if (!sk->sk_backlog.len) 2423 atomic_set(dcnt, 0); 2424 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2425 if (likely(!sk_add_backlog(sk, skb, lim))) { 2426 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2427 "bklg & rcvq >90% allocated!"); 2428 continue; 2429 } 2430 2431 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2432 /* Overload => reject message back to sender */ 2433 onode = tipc_own_addr(sock_net(sk)); 2434 atomic_inc(&sk->sk_drops); 2435 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2436 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2437 "@sk_enqueue!"); 2438 __skb_queue_tail(xmitq, skb); 2439 } 2440 break; 2441 } 2442 } 2443 2444 /** 2445 * tipc_sk_rcv - handle a chain of incoming buffers 2446 * @net: the associated network namespace 2447 * @inputq: buffer list containing the buffers 2448 * Consumes all buffers in list until inputq is empty 2449 * Note: may be called in multiple threads referring to the same queue 2450 */ 2451 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2452 { 2453 struct sk_buff_head xmitq; 2454 u32 dnode, dport = 0; 2455 int err; 2456 struct tipc_sock *tsk; 2457 struct sock *sk; 2458 struct sk_buff *skb; 2459 2460 __skb_queue_head_init(&xmitq); 2461 while (skb_queue_len(inputq)) { 2462 dport = tipc_skb_peek_port(inputq, dport); 2463 tsk = tipc_sk_lookup(net, dport); 2464 2465 if (likely(tsk)) { 2466 sk = &tsk->sk; 2467 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2468 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2469 spin_unlock_bh(&sk->sk_lock.slock); 2470 } 2471 /* Send pending response/rejected messages, if any */ 2472 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2473 sock_put(sk); 2474 continue; 2475 } 2476 /* No destination socket => dequeue skb if still there */ 2477 skb = tipc_skb_dequeue(inputq, dport); 2478 if (!skb) 2479 return; 2480 2481 /* Try secondary lookup if unresolved named message */ 2482 err = TIPC_ERR_NO_PORT; 2483 if (tipc_msg_lookup_dest(net, skb, &err)) 2484 goto xmit; 2485 2486 /* Prepare for message rejection */ 2487 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2488 continue; 2489 2490 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2491 xmit: 2492 dnode = msg_destnode(buf_msg(skb)); 2493 tipc_node_xmit_skb(net, skb, dnode, dport); 2494 } 2495 } 2496 2497 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2498 { 2499 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2500 struct sock *sk = sock->sk; 2501 int done; 2502 2503 do { 2504 int err = sock_error(sk); 2505 if (err) 2506 return err; 2507 if (!*timeo_p) 2508 return -ETIMEDOUT; 2509 if (signal_pending(current)) 2510 return sock_intr_errno(*timeo_p); 2511 if (sk->sk_state == TIPC_DISCONNECTING) 2512 break; 2513 2514 add_wait_queue(sk_sleep(sk), &wait); 2515 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2516 &wait); 2517 remove_wait_queue(sk_sleep(sk), &wait); 2518 } while (!done); 2519 return 0; 2520 } 2521 2522 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2523 { 2524 if (addr->family != AF_TIPC) 2525 return false; 2526 if (addr->addrtype == TIPC_SERVICE_RANGE) 2527 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2528 return (addr->addrtype == TIPC_SERVICE_ADDR || 2529 addr->addrtype == TIPC_SOCKET_ADDR); 2530 } 2531 2532 /** 2533 * tipc_connect - establish a connection to another TIPC port 2534 * @sock: socket structure 2535 * @dest: socket address for destination port 2536 * @destlen: size of socket address data structure 2537 * @flags: file-related flags associated with socket 2538 * 2539 * Return: 0 on success, errno otherwise 2540 */ 2541 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2542 int destlen, int flags) 2543 { 2544 struct sock *sk = sock->sk; 2545 struct tipc_sock *tsk = tipc_sk(sk); 2546 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2547 struct msghdr m = {NULL,}; 2548 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2549 int previous; 2550 int res = 0; 2551 2552 if (destlen != sizeof(struct sockaddr_tipc)) 2553 return -EINVAL; 2554 2555 lock_sock(sk); 2556 2557 if (tsk->group) { 2558 res = -EINVAL; 2559 goto exit; 2560 } 2561 2562 if (dst->family == AF_UNSPEC) { 2563 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2564 if (!tipc_sk_type_connectionless(sk)) 2565 res = -EINVAL; 2566 goto exit; 2567 } 2568 if (!tipc_sockaddr_is_sane(dst)) { 2569 res = -EINVAL; 2570 goto exit; 2571 } 2572 /* DGRAM/RDM connect(), just save the destaddr */ 2573 if (tipc_sk_type_connectionless(sk)) { 2574 memcpy(&tsk->peer, dest, destlen); 2575 goto exit; 2576 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2577 res = -EINVAL; 2578 goto exit; 2579 } 2580 2581 previous = sk->sk_state; 2582 2583 switch (sk->sk_state) { 2584 case TIPC_OPEN: 2585 /* Send a 'SYN-' to destination */ 2586 m.msg_name = dest; 2587 m.msg_namelen = destlen; 2588 2589 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2590 * indicate send_msg() is never blocked. 2591 */ 2592 if (!timeout) 2593 m.msg_flags = MSG_DONTWAIT; 2594 2595 res = __tipc_sendmsg(sock, &m, 0); 2596 if ((res < 0) && (res != -EWOULDBLOCK)) 2597 goto exit; 2598 2599 /* Just entered TIPC_CONNECTING state; the only 2600 * difference is that return value in non-blocking 2601 * case is EINPROGRESS, rather than EALREADY. 2602 */ 2603 res = -EINPROGRESS; 2604 fallthrough; 2605 case TIPC_CONNECTING: 2606 if (!timeout) { 2607 if (previous == TIPC_CONNECTING) 2608 res = -EALREADY; 2609 goto exit; 2610 } 2611 timeout = msecs_to_jiffies(timeout); 2612 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2613 res = tipc_wait_for_connect(sock, &timeout); 2614 break; 2615 case TIPC_ESTABLISHED: 2616 res = -EISCONN; 2617 break; 2618 default: 2619 res = -EINVAL; 2620 } 2621 2622 exit: 2623 release_sock(sk); 2624 return res; 2625 } 2626 2627 /** 2628 * tipc_listen - allow socket to listen for incoming connections 2629 * @sock: socket structure 2630 * @len: (unused) 2631 * 2632 * Return: 0 on success, errno otherwise 2633 */ 2634 static int tipc_listen(struct socket *sock, int len) 2635 { 2636 struct sock *sk = sock->sk; 2637 int res; 2638 2639 lock_sock(sk); 2640 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2641 release_sock(sk); 2642 2643 return res; 2644 } 2645 2646 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2647 { 2648 struct sock *sk = sock->sk; 2649 DEFINE_WAIT(wait); 2650 int err; 2651 2652 /* True wake-one mechanism for incoming connections: only 2653 * one process gets woken up, not the 'whole herd'. 2654 * Since we do not 'race & poll' for established sockets 2655 * anymore, the common case will execute the loop only once. 2656 */ 2657 for (;;) { 2658 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 2659 TASK_INTERRUPTIBLE); 2660 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2661 release_sock(sk); 2662 timeo = schedule_timeout(timeo); 2663 lock_sock(sk); 2664 } 2665 err = 0; 2666 if (!skb_queue_empty(&sk->sk_receive_queue)) 2667 break; 2668 err = -EAGAIN; 2669 if (!timeo) 2670 break; 2671 err = sock_intr_errno(timeo); 2672 if (signal_pending(current)) 2673 break; 2674 } 2675 finish_wait(sk_sleep(sk), &wait); 2676 return err; 2677 } 2678 2679 /** 2680 * tipc_accept - wait for connection request 2681 * @sock: listening socket 2682 * @new_sock: new socket that is to be connected 2683 * @flags: file-related flags associated with socket 2684 * @kern: caused by kernel or by userspace? 2685 * 2686 * Return: 0 on success, errno otherwise 2687 */ 2688 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2689 bool kern) 2690 { 2691 struct sock *new_sk, *sk = sock->sk; 2692 struct sk_buff *buf; 2693 struct tipc_sock *new_tsock; 2694 struct tipc_msg *msg; 2695 long timeo; 2696 int res; 2697 2698 lock_sock(sk); 2699 2700 if (sk->sk_state != TIPC_LISTEN) { 2701 res = -EINVAL; 2702 goto exit; 2703 } 2704 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2705 res = tipc_wait_for_accept(sock, timeo); 2706 if (res) 2707 goto exit; 2708 2709 buf = skb_peek(&sk->sk_receive_queue); 2710 2711 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2712 if (res) 2713 goto exit; 2714 security_sk_clone(sock->sk, new_sock->sk); 2715 2716 new_sk = new_sock->sk; 2717 new_tsock = tipc_sk(new_sk); 2718 msg = buf_msg(buf); 2719 2720 /* we lock on new_sk; but lockdep sees the lock on sk */ 2721 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2722 2723 /* 2724 * Reject any stray messages received by new socket 2725 * before the socket lock was taken (very, very unlikely) 2726 */ 2727 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2728 2729 /* Connect new socket to it's peer */ 2730 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2731 2732 tsk_set_importance(new_sk, msg_importance(msg)); 2733 if (msg_named(msg)) { 2734 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR; 2735 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg)); 2736 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg)); 2737 } 2738 2739 /* 2740 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 2741 * Respond to 'SYN+' by queuing it on new socket. 2742 */ 2743 if (!msg_data_sz(msg)) { 2744 struct msghdr m = {NULL,}; 2745 2746 tsk_advance_rx_queue(sk); 2747 __tipc_sendstream(new_sock, &m, 0); 2748 } else { 2749 __skb_dequeue(&sk->sk_receive_queue); 2750 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2751 skb_set_owner_r(buf, new_sk); 2752 } 2753 release_sock(new_sk); 2754 exit: 2755 release_sock(sk); 2756 return res; 2757 } 2758 2759 /** 2760 * tipc_shutdown - shutdown socket connection 2761 * @sock: socket structure 2762 * @how: direction to close (must be SHUT_RDWR) 2763 * 2764 * Terminates connection (if necessary), then purges socket's receive queue. 2765 * 2766 * Return: 0 on success, errno otherwise 2767 */ 2768 static int tipc_shutdown(struct socket *sock, int how) 2769 { 2770 struct sock *sk = sock->sk; 2771 int res; 2772 2773 if (how != SHUT_RDWR) 2774 return -EINVAL; 2775 2776 lock_sock(sk); 2777 2778 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2779 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2780 sk->sk_shutdown = SHUTDOWN_MASK; 2781 2782 if (sk->sk_state == TIPC_DISCONNECTING) { 2783 /* Discard any unreceived messages */ 2784 __skb_queue_purge(&sk->sk_receive_queue); 2785 2786 res = 0; 2787 } else { 2788 res = -ENOTCONN; 2789 } 2790 /* Wake up anyone sleeping in poll. */ 2791 sk->sk_state_change(sk); 2792 2793 release_sock(sk); 2794 return res; 2795 } 2796 2797 static void tipc_sk_check_probing_state(struct sock *sk, 2798 struct sk_buff_head *list) 2799 { 2800 struct tipc_sock *tsk = tipc_sk(sk); 2801 u32 pnode = tsk_peer_node(tsk); 2802 u32 pport = tsk_peer_port(tsk); 2803 u32 self = tsk_own_node(tsk); 2804 u32 oport = tsk->portid; 2805 struct sk_buff *skb; 2806 2807 if (tsk->probe_unacked) { 2808 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2809 sk->sk_err = ECONNABORTED; 2810 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2811 sk->sk_state_change(sk); 2812 return; 2813 } 2814 /* Prepare new probe */ 2815 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2816 pnode, self, pport, oport, TIPC_OK); 2817 if (skb) 2818 __skb_queue_tail(list, skb); 2819 tsk->probe_unacked = true; 2820 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2821 } 2822 2823 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2824 { 2825 struct tipc_sock *tsk = tipc_sk(sk); 2826 2827 /* Try again later if dest link is congested */ 2828 if (tsk->cong_link_cnt) { 2829 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2830 return; 2831 } 2832 /* Prepare SYN for retransmit */ 2833 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2834 } 2835 2836 static void tipc_sk_timeout(struct timer_list *t) 2837 { 2838 struct sock *sk = from_timer(sk, t, sk_timer); 2839 struct tipc_sock *tsk = tipc_sk(sk); 2840 u32 pnode = tsk_peer_node(tsk); 2841 struct sk_buff_head list; 2842 int rc = 0; 2843 2844 __skb_queue_head_init(&list); 2845 bh_lock_sock(sk); 2846 2847 /* Try again later if socket is busy */ 2848 if (sock_owned_by_user(sk)) { 2849 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2850 bh_unlock_sock(sk); 2851 sock_put(sk); 2852 return; 2853 } 2854 2855 if (sk->sk_state == TIPC_ESTABLISHED) 2856 tipc_sk_check_probing_state(sk, &list); 2857 else if (sk->sk_state == TIPC_CONNECTING) 2858 tipc_sk_retry_connect(sk, &list); 2859 2860 bh_unlock_sock(sk); 2861 2862 if (!skb_queue_empty(&list)) 2863 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2864 2865 /* SYN messages may cause link congestion */ 2866 if (rc == -ELINKCONG) { 2867 tipc_dest_push(&tsk->cong_links, pnode, 0); 2868 tsk->cong_link_cnt = 1; 2869 } 2870 sock_put(sk); 2871 } 2872 2873 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2874 { 2875 struct sock *sk = &tsk->sk; 2876 struct net *net = sock_net(sk); 2877 struct tipc_socket_addr skaddr; 2878 struct publication *p; 2879 u32 key; 2880 2881 if (tipc_sk_connected(sk)) 2882 return -EINVAL; 2883 key = tsk->portid + tsk->pub_count + 1; 2884 if (key == tsk->portid) 2885 return -EADDRINUSE; 2886 skaddr.ref = tsk->portid; 2887 skaddr.node = tipc_own_addr(net); 2888 p = tipc_nametbl_publish(net, ua, &skaddr, key); 2889 if (unlikely(!p)) 2890 return -EINVAL; 2891 2892 list_add(&p->binding_sock, &tsk->publications); 2893 tsk->pub_count++; 2894 tsk->published = true; 2895 return 0; 2896 } 2897 2898 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2899 { 2900 struct net *net = sock_net(&tsk->sk); 2901 struct publication *safe, *p; 2902 struct tipc_uaddr _ua; 2903 int rc = -EINVAL; 2904 2905 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) { 2906 if (!ua) { 2907 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope, 2908 p->sr.type, p->sr.lower, p->sr.upper); 2909 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key); 2910 continue; 2911 } 2912 /* Unbind specific publication */ 2913 if (p->scope != ua->scope) 2914 continue; 2915 if (p->sr.type != ua->sr.type) 2916 continue; 2917 if (p->sr.lower != ua->sr.lower) 2918 continue; 2919 if (p->sr.upper != ua->sr.upper) 2920 break; 2921 tipc_nametbl_withdraw(net, ua, &p->sk, p->key); 2922 rc = 0; 2923 break; 2924 } 2925 if (list_empty(&tsk->publications)) { 2926 tsk->published = 0; 2927 rc = 0; 2928 } 2929 return rc; 2930 } 2931 2932 /* tipc_sk_reinit: set non-zero address in all existing sockets 2933 * when we go from standalone to network mode. 2934 */ 2935 void tipc_sk_reinit(struct net *net) 2936 { 2937 struct tipc_net *tn = net_generic(net, tipc_net_id); 2938 struct rhashtable_iter iter; 2939 struct tipc_sock *tsk; 2940 struct tipc_msg *msg; 2941 2942 rhashtable_walk_enter(&tn->sk_rht, &iter); 2943 2944 do { 2945 rhashtable_walk_start(&iter); 2946 2947 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2948 sock_hold(&tsk->sk); 2949 rhashtable_walk_stop(&iter); 2950 lock_sock(&tsk->sk); 2951 msg = &tsk->phdr; 2952 msg_set_prevnode(msg, tipc_own_addr(net)); 2953 msg_set_orignode(msg, tipc_own_addr(net)); 2954 release_sock(&tsk->sk); 2955 rhashtable_walk_start(&iter); 2956 sock_put(&tsk->sk); 2957 } 2958 2959 rhashtable_walk_stop(&iter); 2960 } while (tsk == ERR_PTR(-EAGAIN)); 2961 2962 rhashtable_walk_exit(&iter); 2963 } 2964 2965 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2966 { 2967 struct tipc_net *tn = net_generic(net, tipc_net_id); 2968 struct tipc_sock *tsk; 2969 2970 rcu_read_lock(); 2971 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2972 if (tsk) 2973 sock_hold(&tsk->sk); 2974 rcu_read_unlock(); 2975 2976 return tsk; 2977 } 2978 2979 static int tipc_sk_insert(struct tipc_sock *tsk) 2980 { 2981 struct sock *sk = &tsk->sk; 2982 struct net *net = sock_net(sk); 2983 struct tipc_net *tn = net_generic(net, tipc_net_id); 2984 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 2985 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 2986 2987 while (remaining--) { 2988 portid++; 2989 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 2990 portid = TIPC_MIN_PORT; 2991 tsk->portid = portid; 2992 sock_hold(&tsk->sk); 2993 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 2994 tsk_rht_params)) 2995 return 0; 2996 sock_put(&tsk->sk); 2997 } 2998 2999 return -1; 3000 } 3001 3002 static void tipc_sk_remove(struct tipc_sock *tsk) 3003 { 3004 struct sock *sk = &tsk->sk; 3005 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3006 3007 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3008 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3009 __sock_put(sk); 3010 } 3011 } 3012 3013 static const struct rhashtable_params tsk_rht_params = { 3014 .nelem_hint = 192, 3015 .head_offset = offsetof(struct tipc_sock, node), 3016 .key_offset = offsetof(struct tipc_sock, portid), 3017 .key_len = sizeof(u32), /* portid */ 3018 .max_size = 1048576, 3019 .min_size = 256, 3020 .automatic_shrinking = true, 3021 }; 3022 3023 int tipc_sk_rht_init(struct net *net) 3024 { 3025 struct tipc_net *tn = net_generic(net, tipc_net_id); 3026 3027 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3028 } 3029 3030 void tipc_sk_rht_destroy(struct net *net) 3031 { 3032 struct tipc_net *tn = net_generic(net, tipc_net_id); 3033 3034 /* Wait for socket readers to complete */ 3035 synchronize_net(); 3036 3037 rhashtable_destroy(&tn->sk_rht); 3038 } 3039 3040 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3041 { 3042 struct net *net = sock_net(&tsk->sk); 3043 struct tipc_group *grp = tsk->group; 3044 struct tipc_msg *hdr = &tsk->phdr; 3045 struct tipc_uaddr ua; 3046 int rc; 3047 3048 if (mreq->type < TIPC_RESERVED_TYPES) 3049 return -EACCES; 3050 if (mreq->scope > TIPC_NODE_SCOPE) 3051 return -EINVAL; 3052 if (mreq->scope != TIPC_NODE_SCOPE) 3053 mreq->scope = TIPC_CLUSTER_SCOPE; 3054 if (grp) 3055 return -EACCES; 3056 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3057 if (!grp) 3058 return -ENOMEM; 3059 tsk->group = grp; 3060 msg_set_lookup_scope(hdr, mreq->scope); 3061 msg_set_nametype(hdr, mreq->type); 3062 msg_set_dest_droppable(hdr, true); 3063 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope, 3064 mreq->type, mreq->instance, mreq->instance); 3065 tipc_nametbl_build_group(net, grp, &ua); 3066 rc = tipc_sk_publish(tsk, &ua); 3067 if (rc) { 3068 tipc_group_delete(net, grp); 3069 tsk->group = NULL; 3070 return rc; 3071 } 3072 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3073 tsk->mc_method.rcast = true; 3074 tsk->mc_method.mandatory = true; 3075 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3076 return rc; 3077 } 3078 3079 static int tipc_sk_leave(struct tipc_sock *tsk) 3080 { 3081 struct net *net = sock_net(&tsk->sk); 3082 struct tipc_group *grp = tsk->group; 3083 struct tipc_uaddr ua; 3084 int scope; 3085 3086 if (!grp) 3087 return -EINVAL; 3088 ua.addrtype = TIPC_SERVICE_RANGE; 3089 tipc_group_self(grp, &ua.sr, &scope); 3090 ua.scope = scope; 3091 tipc_group_delete(net, grp); 3092 tsk->group = NULL; 3093 tipc_sk_withdraw(tsk, &ua); 3094 return 0; 3095 } 3096 3097 /** 3098 * tipc_setsockopt - set socket option 3099 * @sock: socket structure 3100 * @lvl: option level 3101 * @opt: option identifier 3102 * @ov: pointer to new option value 3103 * @ol: length of option value 3104 * 3105 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3106 * (to ease compatibility). 3107 * 3108 * Return: 0 on success, errno otherwise 3109 */ 3110 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3111 sockptr_t ov, unsigned int ol) 3112 { 3113 struct sock *sk = sock->sk; 3114 struct tipc_sock *tsk = tipc_sk(sk); 3115 struct tipc_group_req mreq; 3116 u32 value = 0; 3117 int res = 0; 3118 3119 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3120 return 0; 3121 if (lvl != SOL_TIPC) 3122 return -ENOPROTOOPT; 3123 3124 switch (opt) { 3125 case TIPC_IMPORTANCE: 3126 case TIPC_SRC_DROPPABLE: 3127 case TIPC_DEST_DROPPABLE: 3128 case TIPC_CONN_TIMEOUT: 3129 case TIPC_NODELAY: 3130 if (ol < sizeof(value)) 3131 return -EINVAL; 3132 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3133 return -EFAULT; 3134 break; 3135 case TIPC_GROUP_JOIN: 3136 if (ol < sizeof(mreq)) 3137 return -EINVAL; 3138 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3139 return -EFAULT; 3140 break; 3141 default: 3142 if (!sockptr_is_null(ov) || ol) 3143 return -EINVAL; 3144 } 3145 3146 lock_sock(sk); 3147 3148 switch (opt) { 3149 case TIPC_IMPORTANCE: 3150 res = tsk_set_importance(sk, value); 3151 break; 3152 case TIPC_SRC_DROPPABLE: 3153 if (sock->type != SOCK_STREAM) 3154 tsk_set_unreliable(tsk, value); 3155 else 3156 res = -ENOPROTOOPT; 3157 break; 3158 case TIPC_DEST_DROPPABLE: 3159 tsk_set_unreturnable(tsk, value); 3160 break; 3161 case TIPC_CONN_TIMEOUT: 3162 tipc_sk(sk)->conn_timeout = value; 3163 break; 3164 case TIPC_MCAST_BROADCAST: 3165 tsk->mc_method.rcast = false; 3166 tsk->mc_method.mandatory = true; 3167 break; 3168 case TIPC_MCAST_REPLICAST: 3169 tsk->mc_method.rcast = true; 3170 tsk->mc_method.mandatory = true; 3171 break; 3172 case TIPC_GROUP_JOIN: 3173 res = tipc_sk_join(tsk, &mreq); 3174 break; 3175 case TIPC_GROUP_LEAVE: 3176 res = tipc_sk_leave(tsk); 3177 break; 3178 case TIPC_NODELAY: 3179 tsk->nodelay = !!value; 3180 tsk_set_nagle(tsk); 3181 break; 3182 default: 3183 res = -EINVAL; 3184 } 3185 3186 release_sock(sk); 3187 3188 return res; 3189 } 3190 3191 /** 3192 * tipc_getsockopt - get socket option 3193 * @sock: socket structure 3194 * @lvl: option level 3195 * @opt: option identifier 3196 * @ov: receptacle for option value 3197 * @ol: receptacle for length of option value 3198 * 3199 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3200 * (to ease compatibility). 3201 * 3202 * Return: 0 on success, errno otherwise 3203 */ 3204 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3205 char __user *ov, int __user *ol) 3206 { 3207 struct sock *sk = sock->sk; 3208 struct tipc_sock *tsk = tipc_sk(sk); 3209 struct tipc_service_range seq; 3210 int len, scope; 3211 u32 value; 3212 int res; 3213 3214 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3215 return put_user(0, ol); 3216 if (lvl != SOL_TIPC) 3217 return -ENOPROTOOPT; 3218 res = get_user(len, ol); 3219 if (res) 3220 return res; 3221 3222 lock_sock(sk); 3223 3224 switch (opt) { 3225 case TIPC_IMPORTANCE: 3226 value = tsk_importance(tsk); 3227 break; 3228 case TIPC_SRC_DROPPABLE: 3229 value = tsk_unreliable(tsk); 3230 break; 3231 case TIPC_DEST_DROPPABLE: 3232 value = tsk_unreturnable(tsk); 3233 break; 3234 case TIPC_CONN_TIMEOUT: 3235 value = tsk->conn_timeout; 3236 /* no need to set "res", since already 0 at this point */ 3237 break; 3238 case TIPC_NODE_RECVQ_DEPTH: 3239 value = 0; /* was tipc_queue_size, now obsolete */ 3240 break; 3241 case TIPC_SOCK_RECVQ_DEPTH: 3242 value = skb_queue_len(&sk->sk_receive_queue); 3243 break; 3244 case TIPC_SOCK_RECVQ_USED: 3245 value = sk_rmem_alloc_get(sk); 3246 break; 3247 case TIPC_GROUP_JOIN: 3248 seq.type = 0; 3249 if (tsk->group) 3250 tipc_group_self(tsk->group, &seq, &scope); 3251 value = seq.type; 3252 break; 3253 default: 3254 res = -EINVAL; 3255 } 3256 3257 release_sock(sk); 3258 3259 if (res) 3260 return res; /* "get" failed */ 3261 3262 if (len < sizeof(value)) 3263 return -EINVAL; 3264 3265 if (copy_to_user(ov, &value, sizeof(value))) 3266 return -EFAULT; 3267 3268 return put_user(sizeof(value), ol); 3269 } 3270 3271 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3272 { 3273 struct net *net = sock_net(sock->sk); 3274 struct tipc_sioc_nodeid_req nr = {0}; 3275 struct tipc_sioc_ln_req lnr; 3276 void __user *argp = (void __user *)arg; 3277 3278 switch (cmd) { 3279 case SIOCGETLINKNAME: 3280 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3281 return -EFAULT; 3282 if (!tipc_node_get_linkname(net, 3283 lnr.bearer_id & 0xffff, lnr.peer, 3284 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3285 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3286 return -EFAULT; 3287 return 0; 3288 } 3289 return -EADDRNOTAVAIL; 3290 case SIOCGETNODEID: 3291 if (copy_from_user(&nr, argp, sizeof(nr))) 3292 return -EFAULT; 3293 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3294 return -EADDRNOTAVAIL; 3295 if (copy_to_user(argp, &nr, sizeof(nr))) 3296 return -EFAULT; 3297 return 0; 3298 default: 3299 return -ENOIOCTLCMD; 3300 } 3301 } 3302 3303 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3304 { 3305 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3306 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3307 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3308 3309 tsk1->peer.family = AF_TIPC; 3310 tsk1->peer.addrtype = TIPC_SOCKET_ADDR; 3311 tsk1->peer.scope = TIPC_NODE_SCOPE; 3312 tsk1->peer.addr.id.ref = tsk2->portid; 3313 tsk1->peer.addr.id.node = onode; 3314 tsk2->peer.family = AF_TIPC; 3315 tsk2->peer.addrtype = TIPC_SOCKET_ADDR; 3316 tsk2->peer.scope = TIPC_NODE_SCOPE; 3317 tsk2->peer.addr.id.ref = tsk1->portid; 3318 tsk2->peer.addr.id.node = onode; 3319 3320 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3321 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3322 return 0; 3323 } 3324 3325 /* Protocol switches for the various types of TIPC sockets */ 3326 3327 static const struct proto_ops msg_ops = { 3328 .owner = THIS_MODULE, 3329 .family = AF_TIPC, 3330 .release = tipc_release, 3331 .bind = tipc_bind, 3332 .connect = tipc_connect, 3333 .socketpair = tipc_socketpair, 3334 .accept = sock_no_accept, 3335 .getname = tipc_getname, 3336 .poll = tipc_poll, 3337 .ioctl = tipc_ioctl, 3338 .listen = sock_no_listen, 3339 .shutdown = tipc_shutdown, 3340 .setsockopt = tipc_setsockopt, 3341 .getsockopt = tipc_getsockopt, 3342 .sendmsg = tipc_sendmsg, 3343 .recvmsg = tipc_recvmsg, 3344 .mmap = sock_no_mmap, 3345 .sendpage = sock_no_sendpage 3346 }; 3347 3348 static const struct proto_ops packet_ops = { 3349 .owner = THIS_MODULE, 3350 .family = AF_TIPC, 3351 .release = tipc_release, 3352 .bind = tipc_bind, 3353 .connect = tipc_connect, 3354 .socketpair = tipc_socketpair, 3355 .accept = tipc_accept, 3356 .getname = tipc_getname, 3357 .poll = tipc_poll, 3358 .ioctl = tipc_ioctl, 3359 .listen = tipc_listen, 3360 .shutdown = tipc_shutdown, 3361 .setsockopt = tipc_setsockopt, 3362 .getsockopt = tipc_getsockopt, 3363 .sendmsg = tipc_send_packet, 3364 .recvmsg = tipc_recvmsg, 3365 .mmap = sock_no_mmap, 3366 .sendpage = sock_no_sendpage 3367 }; 3368 3369 static const struct proto_ops stream_ops = { 3370 .owner = THIS_MODULE, 3371 .family = AF_TIPC, 3372 .release = tipc_release, 3373 .bind = tipc_bind, 3374 .connect = tipc_connect, 3375 .socketpair = tipc_socketpair, 3376 .accept = tipc_accept, 3377 .getname = tipc_getname, 3378 .poll = tipc_poll, 3379 .ioctl = tipc_ioctl, 3380 .listen = tipc_listen, 3381 .shutdown = tipc_shutdown, 3382 .setsockopt = tipc_setsockopt, 3383 .getsockopt = tipc_getsockopt, 3384 .sendmsg = tipc_sendstream, 3385 .recvmsg = tipc_recvstream, 3386 .mmap = sock_no_mmap, 3387 .sendpage = sock_no_sendpage 3388 }; 3389 3390 static const struct net_proto_family tipc_family_ops = { 3391 .owner = THIS_MODULE, 3392 .family = AF_TIPC, 3393 .create = tipc_sk_create 3394 }; 3395 3396 static struct proto tipc_proto = { 3397 .name = "TIPC", 3398 .owner = THIS_MODULE, 3399 .obj_size = sizeof(struct tipc_sock), 3400 .sysctl_rmem = sysctl_tipc_rmem 3401 }; 3402 3403 /** 3404 * tipc_socket_init - initialize TIPC socket interface 3405 * 3406 * Return: 0 on success, errno otherwise 3407 */ 3408 int tipc_socket_init(void) 3409 { 3410 int res; 3411 3412 res = proto_register(&tipc_proto, 1); 3413 if (res) { 3414 pr_err("Failed to register TIPC protocol type\n"); 3415 goto out; 3416 } 3417 3418 res = sock_register(&tipc_family_ops); 3419 if (res) { 3420 pr_err("Failed to register TIPC socket type\n"); 3421 proto_unregister(&tipc_proto); 3422 goto out; 3423 } 3424 out: 3425 return res; 3426 } 3427 3428 /** 3429 * tipc_socket_stop - stop TIPC socket interface 3430 */ 3431 void tipc_socket_stop(void) 3432 { 3433 sock_unregister(tipc_family_ops.family); 3434 proto_unregister(&tipc_proto); 3435 } 3436 3437 /* Caller should hold socket lock for the passed tipc socket. */ 3438 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3439 { 3440 u32 peer_node, peer_port; 3441 u32 conn_type, conn_instance; 3442 struct nlattr *nest; 3443 3444 peer_node = tsk_peer_node(tsk); 3445 peer_port = tsk_peer_port(tsk); 3446 conn_type = msg_nametype(&tsk->phdr); 3447 conn_instance = msg_nameinst(&tsk->phdr); 3448 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3449 if (!nest) 3450 return -EMSGSIZE; 3451 3452 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3453 goto msg_full; 3454 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3455 goto msg_full; 3456 3457 if (tsk->conn_addrtype != 0) { 3458 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3459 goto msg_full; 3460 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type)) 3461 goto msg_full; 3462 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance)) 3463 goto msg_full; 3464 } 3465 nla_nest_end(skb, nest); 3466 3467 return 0; 3468 3469 msg_full: 3470 nla_nest_cancel(skb, nest); 3471 3472 return -EMSGSIZE; 3473 } 3474 3475 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3476 *tsk) 3477 { 3478 struct net *net = sock_net(skb->sk); 3479 struct sock *sk = &tsk->sk; 3480 3481 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3482 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3483 return -EMSGSIZE; 3484 3485 if (tipc_sk_connected(sk)) { 3486 if (__tipc_nl_add_sk_con(skb, tsk)) 3487 return -EMSGSIZE; 3488 } else if (!list_empty(&tsk->publications)) { 3489 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3490 return -EMSGSIZE; 3491 } 3492 return 0; 3493 } 3494 3495 /* Caller should hold socket lock for the passed tipc socket. */ 3496 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3497 struct tipc_sock *tsk) 3498 { 3499 struct nlattr *attrs; 3500 void *hdr; 3501 3502 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3503 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3504 if (!hdr) 3505 goto msg_cancel; 3506 3507 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3508 if (!attrs) 3509 goto genlmsg_cancel; 3510 3511 if (__tipc_nl_add_sk_info(skb, tsk)) 3512 goto attr_msg_cancel; 3513 3514 nla_nest_end(skb, attrs); 3515 genlmsg_end(skb, hdr); 3516 3517 return 0; 3518 3519 attr_msg_cancel: 3520 nla_nest_cancel(skb, attrs); 3521 genlmsg_cancel: 3522 genlmsg_cancel(skb, hdr); 3523 msg_cancel: 3524 return -EMSGSIZE; 3525 } 3526 3527 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3528 int (*skb_handler)(struct sk_buff *skb, 3529 struct netlink_callback *cb, 3530 struct tipc_sock *tsk)) 3531 { 3532 struct rhashtable_iter *iter = (void *)cb->args[4]; 3533 struct tipc_sock *tsk; 3534 int err; 3535 3536 rhashtable_walk_start(iter); 3537 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3538 if (IS_ERR(tsk)) { 3539 err = PTR_ERR(tsk); 3540 if (err == -EAGAIN) { 3541 err = 0; 3542 continue; 3543 } 3544 break; 3545 } 3546 3547 sock_hold(&tsk->sk); 3548 rhashtable_walk_stop(iter); 3549 lock_sock(&tsk->sk); 3550 err = skb_handler(skb, cb, tsk); 3551 if (err) { 3552 release_sock(&tsk->sk); 3553 sock_put(&tsk->sk); 3554 goto out; 3555 } 3556 release_sock(&tsk->sk); 3557 rhashtable_walk_start(iter); 3558 sock_put(&tsk->sk); 3559 } 3560 rhashtable_walk_stop(iter); 3561 out: 3562 return skb->len; 3563 } 3564 EXPORT_SYMBOL(tipc_nl_sk_walk); 3565 3566 int tipc_dump_start(struct netlink_callback *cb) 3567 { 3568 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3569 } 3570 EXPORT_SYMBOL(tipc_dump_start); 3571 3572 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3573 { 3574 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3575 struct rhashtable_iter *iter = (void *)cb->args[4]; 3576 struct tipc_net *tn = tipc_net(net); 3577 3578 if (!iter) { 3579 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3580 if (!iter) 3581 return -ENOMEM; 3582 3583 cb->args[4] = (long)iter; 3584 } 3585 3586 rhashtable_walk_enter(&tn->sk_rht, iter); 3587 return 0; 3588 } 3589 3590 int tipc_dump_done(struct netlink_callback *cb) 3591 { 3592 struct rhashtable_iter *hti = (void *)cb->args[4]; 3593 3594 rhashtable_walk_exit(hti); 3595 kfree(hti); 3596 return 0; 3597 } 3598 EXPORT_SYMBOL(tipc_dump_done); 3599 3600 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3601 struct tipc_sock *tsk, u32 sk_filter_state, 3602 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3603 { 3604 struct sock *sk = &tsk->sk; 3605 struct nlattr *attrs; 3606 struct nlattr *stat; 3607 3608 /*filter response w.r.t sk_state*/ 3609 if (!(sk_filter_state & (1 << sk->sk_state))) 3610 return 0; 3611 3612 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3613 if (!attrs) 3614 goto msg_cancel; 3615 3616 if (__tipc_nl_add_sk_info(skb, tsk)) 3617 goto attr_msg_cancel; 3618 3619 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3620 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3621 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3622 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3623 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3624 sock_i_uid(sk))) || 3625 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3626 tipc_diag_gen_cookie(sk), 3627 TIPC_NLA_SOCK_PAD)) 3628 goto attr_msg_cancel; 3629 3630 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3631 if (!stat) 3632 goto attr_msg_cancel; 3633 3634 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3635 skb_queue_len(&sk->sk_receive_queue)) || 3636 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3637 skb_queue_len(&sk->sk_write_queue)) || 3638 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3639 atomic_read(&sk->sk_drops))) 3640 goto stat_msg_cancel; 3641 3642 if (tsk->cong_link_cnt && 3643 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3644 goto stat_msg_cancel; 3645 3646 if (tsk_conn_cong(tsk) && 3647 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3648 goto stat_msg_cancel; 3649 3650 nla_nest_end(skb, stat); 3651 3652 if (tsk->group) 3653 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3654 goto stat_msg_cancel; 3655 3656 nla_nest_end(skb, attrs); 3657 3658 return 0; 3659 3660 stat_msg_cancel: 3661 nla_nest_cancel(skb, stat); 3662 attr_msg_cancel: 3663 nla_nest_cancel(skb, attrs); 3664 msg_cancel: 3665 return -EMSGSIZE; 3666 } 3667 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3668 3669 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3670 { 3671 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3672 } 3673 3674 /* Caller should hold socket lock for the passed tipc socket. */ 3675 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3676 struct netlink_callback *cb, 3677 struct publication *publ) 3678 { 3679 void *hdr; 3680 struct nlattr *attrs; 3681 3682 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3683 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3684 if (!hdr) 3685 goto msg_cancel; 3686 3687 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3688 if (!attrs) 3689 goto genlmsg_cancel; 3690 3691 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3692 goto attr_msg_cancel; 3693 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type)) 3694 goto attr_msg_cancel; 3695 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower)) 3696 goto attr_msg_cancel; 3697 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper)) 3698 goto attr_msg_cancel; 3699 3700 nla_nest_end(skb, attrs); 3701 genlmsg_end(skb, hdr); 3702 3703 return 0; 3704 3705 attr_msg_cancel: 3706 nla_nest_cancel(skb, attrs); 3707 genlmsg_cancel: 3708 genlmsg_cancel(skb, hdr); 3709 msg_cancel: 3710 return -EMSGSIZE; 3711 } 3712 3713 /* Caller should hold socket lock for the passed tipc socket. */ 3714 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3715 struct netlink_callback *cb, 3716 struct tipc_sock *tsk, u32 *last_publ) 3717 { 3718 int err; 3719 struct publication *p; 3720 3721 if (*last_publ) { 3722 list_for_each_entry(p, &tsk->publications, binding_sock) { 3723 if (p->key == *last_publ) 3724 break; 3725 } 3726 if (p->key != *last_publ) { 3727 /* We never set seq or call nl_dump_check_consistent() 3728 * this means that setting prev_seq here will cause the 3729 * consistence check to fail in the netlink callback 3730 * handler. Resulting in the last NLMSG_DONE message 3731 * having the NLM_F_DUMP_INTR flag set. 3732 */ 3733 cb->prev_seq = 1; 3734 *last_publ = 0; 3735 return -EPIPE; 3736 } 3737 } else { 3738 p = list_first_entry(&tsk->publications, struct publication, 3739 binding_sock); 3740 } 3741 3742 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3743 err = __tipc_nl_add_sk_publ(skb, cb, p); 3744 if (err) { 3745 *last_publ = p->key; 3746 return err; 3747 } 3748 } 3749 *last_publ = 0; 3750 3751 return 0; 3752 } 3753 3754 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3755 { 3756 int err; 3757 u32 tsk_portid = cb->args[0]; 3758 u32 last_publ = cb->args[1]; 3759 u32 done = cb->args[2]; 3760 struct net *net = sock_net(skb->sk); 3761 struct tipc_sock *tsk; 3762 3763 if (!tsk_portid) { 3764 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3765 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3766 3767 if (!attrs[TIPC_NLA_SOCK]) 3768 return -EINVAL; 3769 3770 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3771 attrs[TIPC_NLA_SOCK], 3772 tipc_nl_sock_policy, NULL); 3773 if (err) 3774 return err; 3775 3776 if (!sock[TIPC_NLA_SOCK_REF]) 3777 return -EINVAL; 3778 3779 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3780 } 3781 3782 if (done) 3783 return 0; 3784 3785 tsk = tipc_sk_lookup(net, tsk_portid); 3786 if (!tsk) 3787 return -EINVAL; 3788 3789 lock_sock(&tsk->sk); 3790 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3791 if (!err) 3792 done = 1; 3793 release_sock(&tsk->sk); 3794 sock_put(&tsk->sk); 3795 3796 cb->args[0] = tsk_portid; 3797 cb->args[1] = last_publ; 3798 cb->args[2] = done; 3799 3800 return skb->len; 3801 } 3802 3803 /** 3804 * tipc_sk_filtering - check if a socket should be traced 3805 * @sk: the socket to be examined 3806 * 3807 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering: 3808 * (portid, sock type, name type, name lower, name upper) 3809 * 3810 * Return: true if the socket meets the socket tuple data 3811 * (value 0 = 'any') or when there is no tuple set (all = 0), 3812 * otherwise false 3813 */ 3814 bool tipc_sk_filtering(struct sock *sk) 3815 { 3816 struct tipc_sock *tsk; 3817 struct publication *p; 3818 u32 _port, _sktype, _type, _lower, _upper; 3819 u32 type = 0, lower = 0, upper = 0; 3820 3821 if (!sk) 3822 return true; 3823 3824 tsk = tipc_sk(sk); 3825 3826 _port = sysctl_tipc_sk_filter[0]; 3827 _sktype = sysctl_tipc_sk_filter[1]; 3828 _type = sysctl_tipc_sk_filter[2]; 3829 _lower = sysctl_tipc_sk_filter[3]; 3830 _upper = sysctl_tipc_sk_filter[4]; 3831 3832 if (!_port && !_sktype && !_type && !_lower && !_upper) 3833 return true; 3834 3835 if (_port) 3836 return (_port == tsk->portid); 3837 3838 if (_sktype && _sktype != sk->sk_type) 3839 return false; 3840 3841 if (tsk->published) { 3842 p = list_first_entry_or_null(&tsk->publications, 3843 struct publication, binding_sock); 3844 if (p) { 3845 type = p->sr.type; 3846 lower = p->sr.lower; 3847 upper = p->sr.upper; 3848 } 3849 } 3850 3851 if (!tipc_sk_type_connectionless(sk)) { 3852 type = msg_nametype(&tsk->phdr); 3853 lower = msg_nameinst(&tsk->phdr); 3854 upper = lower; 3855 } 3856 3857 if ((_type && _type != type) || (_lower && _lower != lower) || 3858 (_upper && _upper != upper)) 3859 return false; 3860 3861 return true; 3862 } 3863 3864 u32 tipc_sock_get_portid(struct sock *sk) 3865 { 3866 return (sk) ? (tipc_sk(sk))->portid : 0; 3867 } 3868 3869 /** 3870 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3871 * both the rcv and backlog queues are considered 3872 * @sk: tipc sk to be checked 3873 * @skb: tipc msg to be checked 3874 * 3875 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3876 */ 3877 3878 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3879 { 3880 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3881 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3882 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3883 3884 return (qsize > lim * 90 / 100); 3885 } 3886 3887 /** 3888 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3889 * only the rcv queue is 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_overlimit2(struct sock *sk, struct sk_buff *skb) 3897 { 3898 unsigned int lim = rcvbuf_limit(sk, skb); 3899 unsigned int qsize = sk_rmem_alloc_get(sk); 3900 3901 return (qsize > lim * 90 / 100); 3902 } 3903 3904 /** 3905 * tipc_sk_dump - dump TIPC socket 3906 * @sk: tipc sk to be dumped 3907 * @dqueues: bitmask to decide if any socket queue to be dumped? 3908 * - TIPC_DUMP_NONE: don't dump socket queues 3909 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3910 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3911 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3912 * - TIPC_DUMP_ALL: dump all the socket queues above 3913 * @buf: returned buffer of dump data in format 3914 */ 3915 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3916 { 3917 int i = 0; 3918 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3919 u32 conn_type, conn_instance; 3920 struct tipc_sock *tsk; 3921 struct publication *p; 3922 bool tsk_connected; 3923 3924 if (!sk) { 3925 i += scnprintf(buf, sz, "sk data: (null)\n"); 3926 return i; 3927 } 3928 3929 tsk = tipc_sk(sk); 3930 tsk_connected = !tipc_sk_type_connectionless(sk); 3931 3932 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3933 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3934 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3935 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3936 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3937 if (tsk_connected) { 3938 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3939 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3940 conn_type = msg_nametype(&tsk->phdr); 3941 conn_instance = msg_nameinst(&tsk->phdr); 3942 i += scnprintf(buf + i, sz - i, " %u", conn_type); 3943 i += scnprintf(buf + i, sz - i, " %u", conn_instance); 3944 } 3945 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3946 if (tsk->published) { 3947 p = list_first_entry_or_null(&tsk->publications, 3948 struct publication, binding_sock); 3949 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0); 3950 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0); 3951 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0); 3952 } 3953 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3954 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3955 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3956 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3957 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3958 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3959 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3960 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3961 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3962 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3963 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3964 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3965 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3966 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3967 3968 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3969 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3970 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3971 } 3972 3973 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3974 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3975 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3976 } 3977 3978 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 3979 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 3980 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 3981 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 3982 i += scnprintf(buf + i, sz - i, " tail "); 3983 i += tipc_skb_dump(sk->sk_backlog.tail, false, 3984 buf + i); 3985 } 3986 } 3987 3988 return i; 3989 } 3990