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 * @conn_type: TIPC type used when connection was established 77 * @conn_instance: TIPC instance used when connection was established 78 * @published: non-zero if port has one or more associated names 79 * @max_pkt: maximum packet size "hint" used when building messages sent by port 80 * @maxnagle: maximum size of msg which can be subject to nagle 81 * @portid: unique port identity in TIPC socket hash table 82 * @phdr: preformatted message header used when sending messages 83 * @cong_links: list of congested links 84 * @publications: list of publications for port 85 * @blocking_link: address of the congested link we are currently sleeping on 86 * @pub_count: total # of publications port has made during its lifetime 87 * @conn_timeout: the time we can wait for an unresponded setup request 88 * @probe_unacked: probe has not received ack yet 89 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 90 * @cong_link_cnt: number of congested links 91 * @snt_unacked: # messages sent by socket, and not yet acked by peer 92 * @snd_win: send window size 93 * @peer_caps: peer capabilities mask 94 * @rcv_unacked: # messages read by user, but not yet acked back to peer 95 * @rcv_win: receive window size 96 * @peer: 'connected' peer for dgram/rdm 97 * @node: hash table node 98 * @mc_method: cookie for use between socket and broadcast layer 99 * @rcu: rcu struct for tipc_sock 100 * @group: TIPC communications group 101 * @oneway: message count in one direction (FIXME) 102 * @nagle_start: current nagle value 103 * @snd_backlog: send backlog count 104 * @msg_acc: messages accepted; used in managing backlog and nagle 105 * @pkt_cnt: TIPC socket packet count 106 * @expect_ack: whether this TIPC socket is expecting an ack 107 * @nodelay: setsockopt() TIPC_NODELAY setting 108 * @group_is_open: TIPC socket group is fully open (FIXME) 109 */ 110 struct tipc_sock { 111 struct sock sk; 112 u32 conn_type; 113 u32 conn_instance; 114 u32 max_pkt; 115 u32 maxnagle; 116 u32 portid; 117 struct tipc_msg phdr; 118 struct list_head cong_links; 119 struct list_head publications; 120 u32 pub_count; 121 atomic_t dupl_rcvcnt; 122 u16 conn_timeout; 123 bool probe_unacked; 124 u16 cong_link_cnt; 125 u16 snt_unacked; 126 u16 snd_win; 127 u16 peer_caps; 128 u16 rcv_unacked; 129 u16 rcv_win; 130 struct sockaddr_tipc peer; 131 struct rhash_head node; 132 struct tipc_mc_method mc_method; 133 struct rcu_head rcu; 134 struct tipc_group *group; 135 u32 oneway; 136 u32 nagle_start; 137 u16 snd_backlog; 138 u16 msg_acc; 139 u16 pkt_cnt; 140 bool expect_ack; 141 bool nodelay; 142 bool group_is_open; 143 bool published; 144 }; 145 146 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 147 static void tipc_data_ready(struct sock *sk); 148 static void tipc_write_space(struct sock *sk); 149 static void tipc_sock_destruct(struct sock *sk); 150 static int tipc_release(struct socket *sock); 151 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 152 bool kern); 153 static void tipc_sk_timeout(struct timer_list *t); 154 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua); 155 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua); 156 static int tipc_sk_leave(struct tipc_sock *tsk); 157 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 158 static int tipc_sk_insert(struct tipc_sock *tsk); 159 static void tipc_sk_remove(struct tipc_sock *tsk); 160 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 161 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 162 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 163 164 static const struct proto_ops packet_ops; 165 static const struct proto_ops stream_ops; 166 static const struct proto_ops msg_ops; 167 static struct proto tipc_proto; 168 static const struct rhashtable_params tsk_rht_params; 169 170 static u32 tsk_own_node(struct tipc_sock *tsk) 171 { 172 return msg_prevnode(&tsk->phdr); 173 } 174 175 static u32 tsk_peer_node(struct tipc_sock *tsk) 176 { 177 return msg_destnode(&tsk->phdr); 178 } 179 180 static u32 tsk_peer_port(struct tipc_sock *tsk) 181 { 182 return msg_destport(&tsk->phdr); 183 } 184 185 static bool tsk_unreliable(struct tipc_sock *tsk) 186 { 187 return msg_src_droppable(&tsk->phdr) != 0; 188 } 189 190 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 191 { 192 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 193 } 194 195 static bool tsk_unreturnable(struct tipc_sock *tsk) 196 { 197 return msg_dest_droppable(&tsk->phdr) != 0; 198 } 199 200 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 201 { 202 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 203 } 204 205 static int tsk_importance(struct tipc_sock *tsk) 206 { 207 return msg_importance(&tsk->phdr); 208 } 209 210 static struct tipc_sock *tipc_sk(const struct sock *sk) 211 { 212 return container_of(sk, struct tipc_sock, sk); 213 } 214 215 int tsk_set_importance(struct sock *sk, int imp) 216 { 217 if (imp > TIPC_CRITICAL_IMPORTANCE) 218 return -EINVAL; 219 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 220 return 0; 221 } 222 223 static bool tsk_conn_cong(struct tipc_sock *tsk) 224 { 225 return tsk->snt_unacked > tsk->snd_win; 226 } 227 228 static u16 tsk_blocks(int len) 229 { 230 return ((len / FLOWCTL_BLK_SZ) + 1); 231 } 232 233 /* tsk_blocks(): translate a buffer size in bytes to number of 234 * advertisable blocks, taking into account the ratio truesize(len)/len 235 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 236 */ 237 static u16 tsk_adv_blocks(int len) 238 { 239 return len / FLOWCTL_BLK_SZ / 4; 240 } 241 242 /* tsk_inc(): increment counter for sent or received data 243 * - If block based flow control is not supported by peer we 244 * fall back to message based ditto, incrementing the counter 245 */ 246 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 247 { 248 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 249 return ((msglen / FLOWCTL_BLK_SZ) + 1); 250 return 1; 251 } 252 253 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 254 */ 255 static void tsk_set_nagle(struct tipc_sock *tsk) 256 { 257 struct sock *sk = &tsk->sk; 258 259 tsk->maxnagle = 0; 260 if (sk->sk_type != SOCK_STREAM) 261 return; 262 if (tsk->nodelay) 263 return; 264 if (!(tsk->peer_caps & TIPC_NAGLE)) 265 return; 266 /* Limit node local buffer size to avoid receive queue overflow */ 267 if (tsk->max_pkt == MAX_MSG_SIZE) 268 tsk->maxnagle = 1500; 269 else 270 tsk->maxnagle = tsk->max_pkt; 271 } 272 273 /** 274 * tsk_advance_rx_queue - discard first buffer in socket receive queue 275 * @sk: network socket 276 * 277 * Caller must hold socket lock 278 */ 279 static void tsk_advance_rx_queue(struct sock *sk) 280 { 281 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 282 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 283 } 284 285 /* tipc_sk_respond() : send response message back to sender 286 */ 287 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 288 { 289 u32 selector; 290 u32 dnode; 291 u32 onode = tipc_own_addr(sock_net(sk)); 292 293 if (!tipc_msg_reverse(onode, &skb, err)) 294 return; 295 296 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 297 dnode = msg_destnode(buf_msg(skb)); 298 selector = msg_origport(buf_msg(skb)); 299 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 300 } 301 302 /** 303 * tsk_rej_rx_queue - reject all buffers in socket receive queue 304 * @sk: network socket 305 * @error: response error code 306 * 307 * Caller must hold socket lock 308 */ 309 static void tsk_rej_rx_queue(struct sock *sk, int error) 310 { 311 struct sk_buff *skb; 312 313 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 314 tipc_sk_respond(sk, skb, error); 315 } 316 317 static bool tipc_sk_connected(struct sock *sk) 318 { 319 return sk->sk_state == TIPC_ESTABLISHED; 320 } 321 322 /* tipc_sk_type_connectionless - check if the socket is datagram socket 323 * @sk: socket 324 * 325 * Returns true if connection less, false otherwise 326 */ 327 static bool tipc_sk_type_connectionless(struct sock *sk) 328 { 329 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 330 } 331 332 /* tsk_peer_msg - verify if message was sent by connected port's peer 333 * 334 * Handles cases where the node's network address has changed from 335 * the default of <0.0.0> to its configured setting. 336 */ 337 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 338 { 339 struct sock *sk = &tsk->sk; 340 u32 self = tipc_own_addr(sock_net(sk)); 341 u32 peer_port = tsk_peer_port(tsk); 342 u32 orig_node, peer_node; 343 344 if (unlikely(!tipc_sk_connected(sk))) 345 return false; 346 347 if (unlikely(msg_origport(msg) != peer_port)) 348 return false; 349 350 orig_node = msg_orignode(msg); 351 peer_node = tsk_peer_node(tsk); 352 353 if (likely(orig_node == peer_node)) 354 return true; 355 356 if (!orig_node && peer_node == self) 357 return true; 358 359 if (!peer_node && orig_node == self) 360 return true; 361 362 return false; 363 } 364 365 /* tipc_set_sk_state - set the sk_state of the socket 366 * @sk: socket 367 * 368 * Caller must hold socket lock 369 * 370 * Returns 0 on success, errno otherwise 371 */ 372 static int tipc_set_sk_state(struct sock *sk, int state) 373 { 374 int oldsk_state = sk->sk_state; 375 int res = -EINVAL; 376 377 switch (state) { 378 case TIPC_OPEN: 379 res = 0; 380 break; 381 case TIPC_LISTEN: 382 case TIPC_CONNECTING: 383 if (oldsk_state == TIPC_OPEN) 384 res = 0; 385 break; 386 case TIPC_ESTABLISHED: 387 if (oldsk_state == TIPC_CONNECTING || 388 oldsk_state == TIPC_OPEN) 389 res = 0; 390 break; 391 case TIPC_DISCONNECTING: 392 if (oldsk_state == TIPC_CONNECTING || 393 oldsk_state == TIPC_ESTABLISHED) 394 res = 0; 395 break; 396 } 397 398 if (!res) 399 sk->sk_state = state; 400 401 return res; 402 } 403 404 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 405 { 406 struct sock *sk = sock->sk; 407 int err = sock_error(sk); 408 int typ = sock->type; 409 410 if (err) 411 return err; 412 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 413 if (sk->sk_state == TIPC_DISCONNECTING) 414 return -EPIPE; 415 else if (!tipc_sk_connected(sk)) 416 return -ENOTCONN; 417 } 418 if (!*timeout) 419 return -EAGAIN; 420 if (signal_pending(current)) 421 return sock_intr_errno(*timeout); 422 423 return 0; 424 } 425 426 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 427 ({ \ 428 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 429 struct sock *sk_; \ 430 int rc_; \ 431 \ 432 while ((rc_ = !(condition_))) { \ 433 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 434 smp_rmb(); \ 435 sk_ = (sock_)->sk; \ 436 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 437 if (rc_) \ 438 break; \ 439 add_wait_queue(sk_sleep(sk_), &wait_); \ 440 release_sock(sk_); \ 441 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 442 sched_annotate_sleep(); \ 443 lock_sock(sk_); \ 444 remove_wait_queue(sk_sleep(sk_), &wait_); \ 445 } \ 446 rc_; \ 447 }) 448 449 /** 450 * tipc_sk_create - create a TIPC socket 451 * @net: network namespace (must be default network) 452 * @sock: pre-allocated socket structure 453 * @protocol: protocol indicator (must be 0) 454 * @kern: caused by kernel or by userspace? 455 * 456 * This routine creates additional data structures used by the TIPC socket, 457 * initializes them, and links them together. 458 * 459 * Return: 0 on success, errno otherwise 460 */ 461 static int tipc_sk_create(struct net *net, struct socket *sock, 462 int protocol, int kern) 463 { 464 const struct proto_ops *ops; 465 struct sock *sk; 466 struct tipc_sock *tsk; 467 struct tipc_msg *msg; 468 469 /* Validate arguments */ 470 if (unlikely(protocol != 0)) 471 return -EPROTONOSUPPORT; 472 473 switch (sock->type) { 474 case SOCK_STREAM: 475 ops = &stream_ops; 476 break; 477 case SOCK_SEQPACKET: 478 ops = &packet_ops; 479 break; 480 case SOCK_DGRAM: 481 case SOCK_RDM: 482 ops = &msg_ops; 483 break; 484 default: 485 return -EPROTOTYPE; 486 } 487 488 /* Allocate socket's protocol area */ 489 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 490 if (sk == NULL) 491 return -ENOMEM; 492 493 tsk = tipc_sk(sk); 494 tsk->max_pkt = MAX_PKT_DEFAULT; 495 tsk->maxnagle = 0; 496 tsk->nagle_start = NAGLE_START_INIT; 497 INIT_LIST_HEAD(&tsk->publications); 498 INIT_LIST_HEAD(&tsk->cong_links); 499 msg = &tsk->phdr; 500 501 /* Finish initializing socket data structures */ 502 sock->ops = ops; 503 sock_init_data(sock, sk); 504 tipc_set_sk_state(sk, TIPC_OPEN); 505 if (tipc_sk_insert(tsk)) { 506 pr_warn("Socket create failed; port number exhausted\n"); 507 return -EINVAL; 508 } 509 510 /* Ensure tsk is visible before we read own_addr. */ 511 smp_mb(); 512 513 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 514 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 515 516 msg_set_origport(msg, tsk->portid); 517 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 518 sk->sk_shutdown = 0; 519 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 520 sk->sk_rcvbuf = sysctl_tipc_rmem[1]; 521 sk->sk_data_ready = tipc_data_ready; 522 sk->sk_write_space = tipc_write_space; 523 sk->sk_destruct = tipc_sock_destruct; 524 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 525 tsk->group_is_open = true; 526 atomic_set(&tsk->dupl_rcvcnt, 0); 527 528 /* Start out with safe limits until we receive an advertised window */ 529 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 530 tsk->rcv_win = tsk->snd_win; 531 532 if (tipc_sk_type_connectionless(sk)) { 533 tsk_set_unreturnable(tsk, true); 534 if (sock->type == SOCK_DGRAM) 535 tsk_set_unreliable(tsk, true); 536 } 537 __skb_queue_head_init(&tsk->mc_method.deferredq); 538 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 539 return 0; 540 } 541 542 static void tipc_sk_callback(struct rcu_head *head) 543 { 544 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 545 546 sock_put(&tsk->sk); 547 } 548 549 /* Caller should hold socket lock for the socket. */ 550 static void __tipc_shutdown(struct socket *sock, int error) 551 { 552 struct sock *sk = sock->sk; 553 struct tipc_sock *tsk = tipc_sk(sk); 554 struct net *net = sock_net(sk); 555 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 556 u32 dnode = tsk_peer_node(tsk); 557 struct sk_buff *skb; 558 559 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 560 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 561 !tsk_conn_cong(tsk))); 562 563 /* Push out delayed messages if in Nagle mode */ 564 tipc_sk_push_backlog(tsk, false); 565 /* Remove pending SYN */ 566 __skb_queue_purge(&sk->sk_write_queue); 567 568 /* Remove partially received buffer if any */ 569 skb = skb_peek(&sk->sk_receive_queue); 570 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 571 __skb_unlink(skb, &sk->sk_receive_queue); 572 kfree_skb(skb); 573 } 574 575 /* Reject all unreceived messages if connectionless */ 576 if (tipc_sk_type_connectionless(sk)) { 577 tsk_rej_rx_queue(sk, error); 578 return; 579 } 580 581 switch (sk->sk_state) { 582 case TIPC_CONNECTING: 583 case TIPC_ESTABLISHED: 584 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 585 tipc_node_remove_conn(net, dnode, tsk->portid); 586 /* Send a FIN+/- to its peer */ 587 skb = __skb_dequeue(&sk->sk_receive_queue); 588 if (skb) { 589 __skb_queue_purge(&sk->sk_receive_queue); 590 tipc_sk_respond(sk, skb, error); 591 break; 592 } 593 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 594 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 595 tsk_own_node(tsk), tsk_peer_port(tsk), 596 tsk->portid, error); 597 if (skb) 598 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 599 break; 600 case TIPC_LISTEN: 601 /* Reject all SYN messages */ 602 tsk_rej_rx_queue(sk, error); 603 break; 604 default: 605 __skb_queue_purge(&sk->sk_receive_queue); 606 break; 607 } 608 } 609 610 /** 611 * tipc_release - destroy a TIPC socket 612 * @sock: socket to destroy 613 * 614 * This routine cleans up any messages that are still queued on the socket. 615 * For DGRAM and RDM socket types, all queued messages are rejected. 616 * For SEQPACKET and STREAM socket types, the first message is rejected 617 * and any others are discarded. (If the first message on a STREAM socket 618 * is partially-read, it is discarded and the next one is rejected instead.) 619 * 620 * NOTE: Rejected messages are not necessarily returned to the sender! They 621 * are returned or discarded according to the "destination droppable" setting 622 * specified for the message by the sender. 623 * 624 * Return: 0 on success, errno otherwise 625 */ 626 static int tipc_release(struct socket *sock) 627 { 628 struct sock *sk = sock->sk; 629 struct tipc_sock *tsk; 630 631 /* 632 * Exit if socket isn't fully initialized (occurs when a failed accept() 633 * releases a pre-allocated child socket that was never used) 634 */ 635 if (sk == NULL) 636 return 0; 637 638 tsk = tipc_sk(sk); 639 lock_sock(sk); 640 641 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 642 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 643 sk->sk_shutdown = SHUTDOWN_MASK; 644 tipc_sk_leave(tsk); 645 tipc_sk_withdraw(tsk, NULL); 646 __skb_queue_purge(&tsk->mc_method.deferredq); 647 sk_stop_timer(sk, &sk->sk_timer); 648 tipc_sk_remove(tsk); 649 650 sock_orphan(sk); 651 /* Reject any messages that accumulated in backlog queue */ 652 release_sock(sk); 653 tipc_dest_list_purge(&tsk->cong_links); 654 tsk->cong_link_cnt = 0; 655 call_rcu(&tsk->rcu, tipc_sk_callback); 656 sock->sk = NULL; 657 658 return 0; 659 } 660 661 /** 662 * __tipc_bind - associate or disassocate TIPC name(s) with a socket 663 * @sock: socket structure 664 * @skaddr: socket address describing name(s) and desired operation 665 * @alen: size of socket address data structure 666 * 667 * Name and name sequence binding is indicated using a positive scope value; 668 * a negative scope value unbinds the specified name. Specifying no name 669 * (i.e. a socket address length of 0) unbinds all names from the socket. 670 * 671 * Return: 0 on success, errno otherwise 672 * 673 * NOTE: This routine doesn't need to take the socket lock since it doesn't 674 * access any non-constant socket information. 675 */ 676 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 677 { 678 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 679 struct tipc_sock *tsk = tipc_sk(sock->sk); 680 bool unbind = false; 681 682 if (unlikely(!alen)) 683 return tipc_sk_withdraw(tsk, NULL); 684 685 if (ua->addrtype == TIPC_SERVICE_ADDR) { 686 ua->addrtype = TIPC_SERVICE_RANGE; 687 ua->sr.upper = ua->sr.lower; 688 } 689 if (ua->scope < 0) { 690 unbind = true; 691 ua->scope = -ua->scope; 692 } 693 /* Users may still use deprecated TIPC_ZONE_SCOPE */ 694 if (ua->scope != TIPC_NODE_SCOPE) 695 ua->scope = TIPC_CLUSTER_SCOPE; 696 697 if (tsk->group) 698 return -EACCES; 699 700 if (unbind) 701 return tipc_sk_withdraw(tsk, ua); 702 return tipc_sk_publish(tsk, ua); 703 } 704 705 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 706 { 707 int res; 708 709 lock_sock(sock->sk); 710 res = __tipc_bind(sock, skaddr, alen); 711 release_sock(sock->sk); 712 return res; 713 } 714 715 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 716 { 717 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 718 u32 atype = ua->addrtype; 719 720 if (alen) { 721 if (!tipc_uaddr_valid(ua, alen)) 722 return -EINVAL; 723 if (atype == TIPC_SOCKET_ADDR) 724 return -EAFNOSUPPORT; 725 if (ua->sr.type < TIPC_RESERVED_TYPES) { 726 pr_warn_once("Can't bind to reserved service type %u\n", 727 ua->sr.type); 728 return -EACCES; 729 } 730 } 731 return tipc_sk_bind(sock, skaddr, alen); 732 } 733 734 /** 735 * tipc_getname - get port ID of socket or peer socket 736 * @sock: socket structure 737 * @uaddr: area for returned socket address 738 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 739 * 740 * Return: 0 on success, errno otherwise 741 * 742 * NOTE: This routine doesn't need to take the socket lock since it only 743 * accesses socket information that is unchanging (or which changes in 744 * a completely predictable manner). 745 */ 746 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 747 int peer) 748 { 749 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 750 struct sock *sk = sock->sk; 751 struct tipc_sock *tsk = tipc_sk(sk); 752 753 memset(addr, 0, sizeof(*addr)); 754 if (peer) { 755 if ((!tipc_sk_connected(sk)) && 756 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 757 return -ENOTCONN; 758 addr->addr.id.ref = tsk_peer_port(tsk); 759 addr->addr.id.node = tsk_peer_node(tsk); 760 } else { 761 addr->addr.id.ref = tsk->portid; 762 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 763 } 764 765 addr->addrtype = TIPC_SOCKET_ADDR; 766 addr->family = AF_TIPC; 767 addr->scope = 0; 768 addr->addr.name.domain = 0; 769 770 return sizeof(*addr); 771 } 772 773 /** 774 * tipc_poll - read and possibly block on pollmask 775 * @file: file structure associated with the socket 776 * @sock: socket for which to calculate the poll bits 777 * @wait: ??? 778 * 779 * Return: pollmask value 780 * 781 * COMMENTARY: 782 * It appears that the usual socket locking mechanisms are not useful here 783 * since the pollmask info is potentially out-of-date the moment this routine 784 * exits. TCP and other protocols seem to rely on higher level poll routines 785 * to handle any preventable race conditions, so TIPC will do the same ... 786 * 787 * IMPORTANT: The fact that a read or write operation is indicated does NOT 788 * imply that the operation will succeed, merely that it should be performed 789 * and will not block. 790 */ 791 static __poll_t tipc_poll(struct file *file, struct socket *sock, 792 poll_table *wait) 793 { 794 struct sock *sk = sock->sk; 795 struct tipc_sock *tsk = tipc_sk(sk); 796 __poll_t revents = 0; 797 798 sock_poll_wait(file, sock, wait); 799 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 800 801 if (sk->sk_shutdown & RCV_SHUTDOWN) 802 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 803 if (sk->sk_shutdown == SHUTDOWN_MASK) 804 revents |= EPOLLHUP; 805 806 switch (sk->sk_state) { 807 case TIPC_ESTABLISHED: 808 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 809 revents |= EPOLLOUT; 810 fallthrough; 811 case TIPC_LISTEN: 812 case TIPC_CONNECTING: 813 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 814 revents |= EPOLLIN | EPOLLRDNORM; 815 break; 816 case TIPC_OPEN: 817 if (tsk->group_is_open && !tsk->cong_link_cnt) 818 revents |= EPOLLOUT; 819 if (!tipc_sk_type_connectionless(sk)) 820 break; 821 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 822 break; 823 revents |= EPOLLIN | EPOLLRDNORM; 824 break; 825 case TIPC_DISCONNECTING: 826 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 827 break; 828 } 829 return revents; 830 } 831 832 /** 833 * tipc_sendmcast - send multicast message 834 * @sock: socket structure 835 * @ua: destination address struct 836 * @msg: message to send 837 * @dlen: length of data to send 838 * @timeout: timeout to wait for wakeup 839 * 840 * Called from function tipc_sendmsg(), which has done all sanity checks 841 * Return: the number of bytes sent on success, or errno 842 */ 843 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua, 844 struct msghdr *msg, size_t dlen, long timeout) 845 { 846 struct sock *sk = sock->sk; 847 struct tipc_sock *tsk = tipc_sk(sk); 848 struct tipc_msg *hdr = &tsk->phdr; 849 struct net *net = sock_net(sk); 850 int mtu = tipc_bcast_get_mtu(net); 851 struct sk_buff_head pkts; 852 struct tipc_nlist dsts; 853 int rc; 854 855 if (tsk->group) 856 return -EACCES; 857 858 /* Block or return if any destination link is congested */ 859 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 860 if (unlikely(rc)) 861 return rc; 862 863 /* Lookup destination nodes */ 864 tipc_nlist_init(&dsts, tipc_own_addr(net)); 865 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts); 866 if (!dsts.local && !dsts.remote) 867 return -EHOSTUNREACH; 868 869 /* Build message header */ 870 msg_set_type(hdr, TIPC_MCAST_MSG); 871 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 872 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 873 msg_set_destport(hdr, 0); 874 msg_set_destnode(hdr, 0); 875 msg_set_nametype(hdr, ua->sr.type); 876 msg_set_namelower(hdr, ua->sr.lower); 877 msg_set_nameupper(hdr, ua->sr.upper); 878 879 /* Build message as chain of buffers */ 880 __skb_queue_head_init(&pkts); 881 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 882 883 /* Send message if build was successful */ 884 if (unlikely(rc == dlen)) { 885 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 886 TIPC_DUMP_SK_SNDQ, " "); 887 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts, 888 &tsk->cong_link_cnt); 889 } 890 891 tipc_nlist_purge(&dsts); 892 893 return rc ? rc : dlen; 894 } 895 896 /** 897 * tipc_send_group_msg - send a message to a member in the group 898 * @net: network namespace 899 * @tsk: tipc socket 900 * @m: message to send 901 * @mb: group member 902 * @dnode: destination node 903 * @dport: destination port 904 * @dlen: total length of message data 905 */ 906 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 907 struct msghdr *m, struct tipc_member *mb, 908 u32 dnode, u32 dport, int dlen) 909 { 910 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 911 struct tipc_mc_method *method = &tsk->mc_method; 912 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 913 struct tipc_msg *hdr = &tsk->phdr; 914 struct sk_buff_head pkts; 915 int mtu, rc; 916 917 /* Complete message header */ 918 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 919 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 920 msg_set_destport(hdr, dport); 921 msg_set_destnode(hdr, dnode); 922 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 923 924 /* Build message as chain of buffers */ 925 __skb_queue_head_init(&pkts); 926 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 927 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 928 if (unlikely(rc != dlen)) 929 return rc; 930 931 /* Send message */ 932 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 933 if (unlikely(rc == -ELINKCONG)) { 934 tipc_dest_push(&tsk->cong_links, dnode, 0); 935 tsk->cong_link_cnt++; 936 } 937 938 /* Update send window */ 939 tipc_group_update_member(mb, blks); 940 941 /* A broadcast sent within next EXPIRE period must follow same path */ 942 method->rcast = true; 943 method->mandatory = true; 944 return dlen; 945 } 946 947 /** 948 * tipc_send_group_unicast - send message to a member in the group 949 * @sock: socket structure 950 * @m: message to send 951 * @dlen: total length of message data 952 * @timeout: timeout to wait for wakeup 953 * 954 * Called from function tipc_sendmsg(), which has done all sanity checks 955 * Return: the number of bytes sent on success, or errno 956 */ 957 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 958 int dlen, long timeout) 959 { 960 struct sock *sk = sock->sk; 961 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 962 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 963 struct tipc_sock *tsk = tipc_sk(sk); 964 struct net *net = sock_net(sk); 965 struct tipc_member *mb = NULL; 966 u32 node, port; 967 int rc; 968 969 node = ua->sk.node; 970 port = ua->sk.ref; 971 if (!port && !node) 972 return -EHOSTUNREACH; 973 974 /* Block or return if destination link or member is congested */ 975 rc = tipc_wait_for_cond(sock, &timeout, 976 !tipc_dest_find(&tsk->cong_links, node, 0) && 977 tsk->group && 978 !tipc_group_cong(tsk->group, node, port, blks, 979 &mb)); 980 if (unlikely(rc)) 981 return rc; 982 983 if (unlikely(!mb)) 984 return -EHOSTUNREACH; 985 986 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 987 988 return rc ? rc : dlen; 989 } 990 991 /** 992 * tipc_send_group_anycast - send message to any member with given identity 993 * @sock: socket structure 994 * @m: message to send 995 * @dlen: total length of message data 996 * @timeout: timeout to wait for wakeup 997 * 998 * Called from function tipc_sendmsg(), which has done all sanity checks 999 * Return: the number of bytes sent on success, or errno 1000 */ 1001 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 1002 int dlen, long timeout) 1003 { 1004 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1005 struct sock *sk = sock->sk; 1006 struct tipc_sock *tsk = tipc_sk(sk); 1007 struct list_head *cong_links = &tsk->cong_links; 1008 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 1009 struct tipc_msg *hdr = &tsk->phdr; 1010 struct tipc_member *first = NULL; 1011 struct tipc_member *mbr = NULL; 1012 struct net *net = sock_net(sk); 1013 u32 node, port, exclude; 1014 struct list_head dsts; 1015 int lookups = 0; 1016 int dstcnt, rc; 1017 bool cong; 1018 1019 INIT_LIST_HEAD(&dsts); 1020 ua->sa.type = msg_nametype(hdr); 1021 ua->scope = msg_lookup_scope(hdr); 1022 1023 while (++lookups < 4) { 1024 exclude = tipc_group_exclude(tsk->group); 1025 1026 first = NULL; 1027 1028 /* Look for a non-congested destination member, if any */ 1029 while (1) { 1030 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, 1031 exclude, false)) 1032 return -EHOSTUNREACH; 1033 tipc_dest_pop(&dsts, &node, &port); 1034 cong = tipc_group_cong(tsk->group, node, port, blks, 1035 &mbr); 1036 if (!cong) 1037 break; 1038 if (mbr == first) 1039 break; 1040 if (!first) 1041 first = mbr; 1042 } 1043 1044 /* Start over if destination was not in member list */ 1045 if (unlikely(!mbr)) 1046 continue; 1047 1048 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1049 break; 1050 1051 /* Block or return if destination link or member is congested */ 1052 rc = tipc_wait_for_cond(sock, &timeout, 1053 !tipc_dest_find(cong_links, node, 0) && 1054 tsk->group && 1055 !tipc_group_cong(tsk->group, node, port, 1056 blks, &mbr)); 1057 if (unlikely(rc)) 1058 return rc; 1059 1060 /* Send, unless destination disappeared while waiting */ 1061 if (likely(mbr)) 1062 break; 1063 } 1064 1065 if (unlikely(lookups >= 4)) 1066 return -EHOSTUNREACH; 1067 1068 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1069 1070 return rc ? rc : dlen; 1071 } 1072 1073 /** 1074 * tipc_send_group_bcast - send message to all members in communication group 1075 * @sock: socket structure 1076 * @m: message to send 1077 * @dlen: total length of message data 1078 * @timeout: timeout to wait for wakeup 1079 * 1080 * Called from function tipc_sendmsg(), which has done all sanity checks 1081 * Return: the number of bytes sent on success, or errno 1082 */ 1083 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1084 int dlen, long timeout) 1085 { 1086 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1087 struct sock *sk = sock->sk; 1088 struct net *net = sock_net(sk); 1089 struct tipc_sock *tsk = tipc_sk(sk); 1090 struct tipc_nlist *dsts; 1091 struct tipc_mc_method *method = &tsk->mc_method; 1092 bool ack = method->mandatory && method->rcast; 1093 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1094 struct tipc_msg *hdr = &tsk->phdr; 1095 int mtu = tipc_bcast_get_mtu(net); 1096 struct sk_buff_head pkts; 1097 int rc = -EHOSTUNREACH; 1098 1099 /* Block or return if any destination link or member is congested */ 1100 rc = tipc_wait_for_cond(sock, &timeout, 1101 !tsk->cong_link_cnt && tsk->group && 1102 !tipc_group_bc_cong(tsk->group, blks)); 1103 if (unlikely(rc)) 1104 return rc; 1105 1106 dsts = tipc_group_dests(tsk->group); 1107 if (!dsts->local && !dsts->remote) 1108 return -EHOSTUNREACH; 1109 1110 /* Complete message header */ 1111 if (ua) { 1112 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1113 msg_set_nameinst(hdr, ua->sa.instance); 1114 } else { 1115 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1116 msg_set_nameinst(hdr, 0); 1117 } 1118 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1119 msg_set_destport(hdr, 0); 1120 msg_set_destnode(hdr, 0); 1121 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1122 1123 /* Avoid getting stuck with repeated forced replicasts */ 1124 msg_set_grp_bc_ack_req(hdr, ack); 1125 1126 /* Build message as chain of buffers */ 1127 __skb_queue_head_init(&pkts); 1128 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1129 if (unlikely(rc != dlen)) 1130 return rc; 1131 1132 /* Send message */ 1133 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1134 if (unlikely(rc)) 1135 return rc; 1136 1137 /* Update broadcast sequence number and send windows */ 1138 tipc_group_update_bc_members(tsk->group, blks, ack); 1139 1140 /* Broadcast link is now free to choose method for next broadcast */ 1141 method->mandatory = false; 1142 method->expires = jiffies; 1143 1144 return dlen; 1145 } 1146 1147 /** 1148 * tipc_send_group_mcast - send message to all members with given identity 1149 * @sock: socket structure 1150 * @m: message to send 1151 * @dlen: total length of message data 1152 * @timeout: timeout to wait for wakeup 1153 * 1154 * Called from function tipc_sendmsg(), which has done all sanity checks 1155 * Return: the number of bytes sent on success, or errno 1156 */ 1157 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1158 int dlen, long timeout) 1159 { 1160 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1161 struct sock *sk = sock->sk; 1162 struct tipc_sock *tsk = tipc_sk(sk); 1163 struct tipc_group *grp = tsk->group; 1164 struct tipc_msg *hdr = &tsk->phdr; 1165 struct net *net = sock_net(sk); 1166 struct list_head dsts; 1167 u32 dstcnt, exclude; 1168 1169 INIT_LIST_HEAD(&dsts); 1170 ua->sa.type = msg_nametype(hdr); 1171 ua->scope = msg_lookup_scope(hdr); 1172 exclude = tipc_group_exclude(grp); 1173 1174 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true)) 1175 return -EHOSTUNREACH; 1176 1177 if (dstcnt == 1) { 1178 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref); 1179 return tipc_send_group_unicast(sock, m, dlen, timeout); 1180 } 1181 1182 tipc_dest_list_purge(&dsts); 1183 return tipc_send_group_bcast(sock, m, dlen, timeout); 1184 } 1185 1186 /** 1187 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1188 * @net: the associated network namespace 1189 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1190 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1191 * 1192 * Multi-threaded: parallel calls with reference to same queues may occur 1193 */ 1194 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1195 struct sk_buff_head *inputq) 1196 { 1197 u32 self = tipc_own_addr(net); 1198 struct sk_buff *skb, *_skb; 1199 u32 portid, onode; 1200 struct sk_buff_head tmpq; 1201 struct list_head dports; 1202 struct tipc_msg *hdr; 1203 struct tipc_uaddr ua; 1204 int user, mtyp, hlen; 1205 bool exact; 1206 1207 __skb_queue_head_init(&tmpq); 1208 INIT_LIST_HEAD(&dports); 1209 ua.addrtype = TIPC_SERVICE_RANGE; 1210 1211 skb = tipc_skb_peek(arrvq, &inputq->lock); 1212 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1213 hdr = buf_msg(skb); 1214 user = msg_user(hdr); 1215 mtyp = msg_type(hdr); 1216 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1217 onode = msg_orignode(hdr); 1218 ua.sr.type = msg_nametype(hdr); 1219 1220 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1221 spin_lock_bh(&inputq->lock); 1222 if (skb_peek(arrvq) == skb) { 1223 __skb_dequeue(arrvq); 1224 __skb_queue_tail(inputq, skb); 1225 } 1226 kfree_skb(skb); 1227 spin_unlock_bh(&inputq->lock); 1228 continue; 1229 } 1230 1231 /* Group messages require exact scope match */ 1232 if (msg_in_group(hdr)) { 1233 ua.sr.lower = 0; 1234 ua.sr.upper = ~0; 1235 ua.scope = msg_lookup_scope(hdr); 1236 exact = true; 1237 } else { 1238 /* TIPC_NODE_SCOPE means "any scope" in this context */ 1239 if (onode == self) 1240 ua.scope = TIPC_NODE_SCOPE; 1241 else 1242 ua.scope = TIPC_CLUSTER_SCOPE; 1243 exact = false; 1244 ua.sr.lower = msg_namelower(hdr); 1245 ua.sr.upper = msg_nameupper(hdr); 1246 } 1247 1248 /* Create destination port list: */ 1249 tipc_nametbl_lookup_mcast_sockets(net, &ua, exact, &dports); 1250 1251 /* Clone message per destination */ 1252 while (tipc_dest_pop(&dports, NULL, &portid)) { 1253 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1254 if (_skb) { 1255 msg_set_destport(buf_msg(_skb), portid); 1256 __skb_queue_tail(&tmpq, _skb); 1257 continue; 1258 } 1259 pr_warn("Failed to clone mcast rcv buffer\n"); 1260 } 1261 /* Append to inputq if not already done by other thread */ 1262 spin_lock_bh(&inputq->lock); 1263 if (skb_peek(arrvq) == skb) { 1264 skb_queue_splice_tail_init(&tmpq, inputq); 1265 /* Decrease the skb's refcnt as increasing in the 1266 * function tipc_skb_peek 1267 */ 1268 kfree_skb(__skb_dequeue(arrvq)); 1269 } 1270 spin_unlock_bh(&inputq->lock); 1271 __skb_queue_purge(&tmpq); 1272 kfree_skb(skb); 1273 } 1274 tipc_sk_rcv(net, inputq); 1275 } 1276 1277 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1278 * when socket is in Nagle mode 1279 */ 1280 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1281 { 1282 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1283 struct sk_buff *skb = skb_peek_tail(txq); 1284 struct net *net = sock_net(&tsk->sk); 1285 u32 dnode = tsk_peer_node(tsk); 1286 int rc; 1287 1288 if (nagle_ack) { 1289 tsk->pkt_cnt += skb_queue_len(txq); 1290 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1291 tsk->oneway = 0; 1292 if (tsk->nagle_start < NAGLE_START_MAX) 1293 tsk->nagle_start *= 2; 1294 tsk->expect_ack = false; 1295 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1296 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1297 tsk->nagle_start); 1298 } else { 1299 tsk->nagle_start = NAGLE_START_INIT; 1300 if (skb) { 1301 msg_set_ack_required(buf_msg(skb)); 1302 tsk->expect_ack = true; 1303 } else { 1304 tsk->expect_ack = false; 1305 } 1306 } 1307 tsk->msg_acc = 0; 1308 tsk->pkt_cnt = 0; 1309 } 1310 1311 if (!skb || tsk->cong_link_cnt) 1312 return; 1313 1314 /* Do not send SYN again after congestion */ 1315 if (msg_is_syn(buf_msg(skb))) 1316 return; 1317 1318 if (tsk->msg_acc) 1319 tsk->pkt_cnt += skb_queue_len(txq); 1320 tsk->snt_unacked += tsk->snd_backlog; 1321 tsk->snd_backlog = 0; 1322 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1323 if (rc == -ELINKCONG) 1324 tsk->cong_link_cnt = 1; 1325 } 1326 1327 /** 1328 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1329 * @tsk: receiving socket 1330 * @skb: pointer to message buffer. 1331 * @inputq: buffer list containing the buffers 1332 * @xmitq: output message area 1333 */ 1334 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1335 struct sk_buff_head *inputq, 1336 struct sk_buff_head *xmitq) 1337 { 1338 struct tipc_msg *hdr = buf_msg(skb); 1339 u32 onode = tsk_own_node(tsk); 1340 struct sock *sk = &tsk->sk; 1341 int mtyp = msg_type(hdr); 1342 bool was_cong; 1343 1344 /* Ignore if connection cannot be validated: */ 1345 if (!tsk_peer_msg(tsk, hdr)) { 1346 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1347 goto exit; 1348 } 1349 1350 if (unlikely(msg_errcode(hdr))) { 1351 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1352 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1353 tsk_peer_port(tsk)); 1354 sk->sk_state_change(sk); 1355 1356 /* State change is ignored if socket already awake, 1357 * - convert msg to abort msg and add to inqueue 1358 */ 1359 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1360 msg_set_type(hdr, TIPC_CONN_MSG); 1361 msg_set_size(hdr, BASIC_H_SIZE); 1362 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1363 __skb_queue_tail(inputq, skb); 1364 return; 1365 } 1366 1367 tsk->probe_unacked = false; 1368 1369 if (mtyp == CONN_PROBE) { 1370 msg_set_type(hdr, CONN_PROBE_REPLY); 1371 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1372 __skb_queue_tail(xmitq, skb); 1373 return; 1374 } else if (mtyp == CONN_ACK) { 1375 was_cong = tsk_conn_cong(tsk); 1376 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1377 tsk->snt_unacked -= msg_conn_ack(hdr); 1378 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1379 tsk->snd_win = msg_adv_win(hdr); 1380 if (was_cong && !tsk_conn_cong(tsk)) 1381 sk->sk_write_space(sk); 1382 } else if (mtyp != CONN_PROBE_REPLY) { 1383 pr_warn("Received unknown CONN_PROTO msg\n"); 1384 } 1385 exit: 1386 kfree_skb(skb); 1387 } 1388 1389 /** 1390 * tipc_sendmsg - send message in connectionless manner 1391 * @sock: socket structure 1392 * @m: message to send 1393 * @dsz: amount of user data to be sent 1394 * 1395 * Message must have an destination specified explicitly. 1396 * Used for SOCK_RDM and SOCK_DGRAM messages, 1397 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1398 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1399 * 1400 * Return: the number of bytes sent on success, or errno otherwise 1401 */ 1402 static int tipc_sendmsg(struct socket *sock, 1403 struct msghdr *m, size_t dsz) 1404 { 1405 struct sock *sk = sock->sk; 1406 int ret; 1407 1408 lock_sock(sk); 1409 ret = __tipc_sendmsg(sock, m, dsz); 1410 release_sock(sk); 1411 1412 return ret; 1413 } 1414 1415 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1416 { 1417 struct sock *sk = sock->sk; 1418 struct net *net = sock_net(sk); 1419 struct tipc_sock *tsk = tipc_sk(sk); 1420 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1421 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1422 struct list_head *clinks = &tsk->cong_links; 1423 bool syn = !tipc_sk_type_connectionless(sk); 1424 struct tipc_group *grp = tsk->group; 1425 struct tipc_msg *hdr = &tsk->phdr; 1426 struct tipc_socket_addr skaddr; 1427 struct sk_buff_head pkts; 1428 int atype, mtu, rc; 1429 1430 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1431 return -EMSGSIZE; 1432 1433 if (ua) { 1434 if (!tipc_uaddr_valid(ua, m->msg_namelen)) 1435 return -EINVAL; 1436 atype = ua->addrtype; 1437 } 1438 1439 /* If socket belongs to a communication group follow other paths */ 1440 if (grp) { 1441 if (!ua) 1442 return tipc_send_group_bcast(sock, m, dlen, timeout); 1443 if (atype == TIPC_SERVICE_ADDR) 1444 return tipc_send_group_anycast(sock, m, dlen, timeout); 1445 if (atype == TIPC_SOCKET_ADDR) 1446 return tipc_send_group_unicast(sock, m, dlen, timeout); 1447 if (atype == TIPC_SERVICE_RANGE) 1448 return tipc_send_group_mcast(sock, m, dlen, timeout); 1449 return -EINVAL; 1450 } 1451 1452 if (!ua) { 1453 ua = (struct tipc_uaddr *)&tsk->peer; 1454 if (!syn && ua->family != AF_TIPC) 1455 return -EDESTADDRREQ; 1456 atype = ua->addrtype; 1457 } 1458 1459 if (unlikely(syn)) { 1460 if (sk->sk_state == TIPC_LISTEN) 1461 return -EPIPE; 1462 if (sk->sk_state != TIPC_OPEN) 1463 return -EISCONN; 1464 if (tsk->published) 1465 return -EOPNOTSUPP; 1466 if (atype == TIPC_SERVICE_ADDR) { 1467 tsk->conn_type = ua->sa.type; 1468 tsk->conn_instance = ua->sa.instance; 1469 } 1470 msg_set_syn(hdr, 1); 1471 } 1472 1473 /* Determine destination */ 1474 if (atype == TIPC_SERVICE_RANGE) { 1475 return tipc_sendmcast(sock, ua, m, dlen, timeout); 1476 } else if (atype == TIPC_SERVICE_ADDR) { 1477 skaddr.node = ua->lookup_node; 1478 ua->scope = tipc_node2scope(skaddr.node); 1479 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr)) 1480 return -EHOSTUNREACH; 1481 } else if (atype == TIPC_SOCKET_ADDR) { 1482 skaddr = ua->sk; 1483 } else { 1484 return -EINVAL; 1485 } 1486 1487 /* Block or return if destination link is congested */ 1488 rc = tipc_wait_for_cond(sock, &timeout, 1489 !tipc_dest_find(clinks, skaddr.node, 0)); 1490 if (unlikely(rc)) 1491 return rc; 1492 1493 /* Finally build message header */ 1494 msg_set_destnode(hdr, skaddr.node); 1495 msg_set_destport(hdr, skaddr.ref); 1496 if (atype == TIPC_SERVICE_ADDR) { 1497 msg_set_type(hdr, TIPC_NAMED_MSG); 1498 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1499 msg_set_nametype(hdr, ua->sa.type); 1500 msg_set_nameinst(hdr, ua->sa.instance); 1501 msg_set_lookup_scope(hdr, ua->scope); 1502 } else { /* TIPC_SOCKET_ADDR */ 1503 msg_set_type(hdr, TIPC_DIRECT_MSG); 1504 msg_set_lookup_scope(hdr, 0); 1505 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1506 } 1507 1508 /* Add message body */ 1509 __skb_queue_head_init(&pkts); 1510 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true); 1511 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1512 if (unlikely(rc != dlen)) 1513 return rc; 1514 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1515 __skb_queue_purge(&pkts); 1516 return -ENOMEM; 1517 } 1518 1519 /* Send message */ 1520 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1521 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid); 1522 if (unlikely(rc == -ELINKCONG)) { 1523 tipc_dest_push(clinks, skaddr.node, 0); 1524 tsk->cong_link_cnt++; 1525 rc = 0; 1526 } 1527 1528 if (unlikely(syn && !rc)) 1529 tipc_set_sk_state(sk, TIPC_CONNECTING); 1530 1531 return rc ? rc : dlen; 1532 } 1533 1534 /** 1535 * tipc_sendstream - send stream-oriented data 1536 * @sock: socket structure 1537 * @m: data to send 1538 * @dsz: total length of data to be transmitted 1539 * 1540 * Used for SOCK_STREAM data. 1541 * 1542 * Return: the number of bytes sent on success (or partial success), 1543 * or errno if no data sent 1544 */ 1545 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1546 { 1547 struct sock *sk = sock->sk; 1548 int ret; 1549 1550 lock_sock(sk); 1551 ret = __tipc_sendstream(sock, m, dsz); 1552 release_sock(sk); 1553 1554 return ret; 1555 } 1556 1557 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1558 { 1559 struct sock *sk = sock->sk; 1560 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1561 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1562 struct sk_buff_head *txq = &sk->sk_write_queue; 1563 struct tipc_sock *tsk = tipc_sk(sk); 1564 struct tipc_msg *hdr = &tsk->phdr; 1565 struct net *net = sock_net(sk); 1566 struct sk_buff *skb; 1567 u32 dnode = tsk_peer_node(tsk); 1568 int maxnagle = tsk->maxnagle; 1569 int maxpkt = tsk->max_pkt; 1570 int send, sent = 0; 1571 int blocks, rc = 0; 1572 1573 if (unlikely(dlen > INT_MAX)) 1574 return -EMSGSIZE; 1575 1576 /* Handle implicit connection setup */ 1577 if (unlikely(dest)) { 1578 rc = __tipc_sendmsg(sock, m, dlen); 1579 if (dlen && dlen == rc) { 1580 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1581 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1582 } 1583 return rc; 1584 } 1585 1586 do { 1587 rc = tipc_wait_for_cond(sock, &timeout, 1588 (!tsk->cong_link_cnt && 1589 !tsk_conn_cong(tsk) && 1590 tipc_sk_connected(sk))); 1591 if (unlikely(rc)) 1592 break; 1593 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1594 blocks = tsk->snd_backlog; 1595 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1596 send <= maxnagle) { 1597 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1598 if (unlikely(rc < 0)) 1599 break; 1600 blocks += rc; 1601 tsk->msg_acc++; 1602 if (blocks <= 64 && tsk->expect_ack) { 1603 tsk->snd_backlog = blocks; 1604 sent += send; 1605 break; 1606 } else if (blocks > 64) { 1607 tsk->pkt_cnt += skb_queue_len(txq); 1608 } else { 1609 skb = skb_peek_tail(txq); 1610 if (skb) { 1611 msg_set_ack_required(buf_msg(skb)); 1612 tsk->expect_ack = true; 1613 } else { 1614 tsk->expect_ack = false; 1615 } 1616 tsk->msg_acc = 0; 1617 tsk->pkt_cnt = 0; 1618 } 1619 } else { 1620 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1621 if (unlikely(rc != send)) 1622 break; 1623 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1624 } 1625 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1626 TIPC_DUMP_SK_SNDQ, " "); 1627 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1628 if (unlikely(rc == -ELINKCONG)) { 1629 tsk->cong_link_cnt = 1; 1630 rc = 0; 1631 } 1632 if (likely(!rc)) { 1633 tsk->snt_unacked += blocks; 1634 tsk->snd_backlog = 0; 1635 sent += send; 1636 } 1637 } while (sent < dlen && !rc); 1638 1639 return sent ? sent : rc; 1640 } 1641 1642 /** 1643 * tipc_send_packet - send a connection-oriented message 1644 * @sock: socket structure 1645 * @m: message to send 1646 * @dsz: length of data to be transmitted 1647 * 1648 * Used for SOCK_SEQPACKET messages. 1649 * 1650 * Return: the number of bytes sent on success, or errno otherwise 1651 */ 1652 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1653 { 1654 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1655 return -EMSGSIZE; 1656 1657 return tipc_sendstream(sock, m, dsz); 1658 } 1659 1660 /* tipc_sk_finish_conn - complete the setup of a connection 1661 */ 1662 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1663 u32 peer_node) 1664 { 1665 struct sock *sk = &tsk->sk; 1666 struct net *net = sock_net(sk); 1667 struct tipc_msg *msg = &tsk->phdr; 1668 1669 msg_set_syn(msg, 0); 1670 msg_set_destnode(msg, peer_node); 1671 msg_set_destport(msg, peer_port); 1672 msg_set_type(msg, TIPC_CONN_MSG); 1673 msg_set_lookup_scope(msg, 0); 1674 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1675 1676 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1677 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1678 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1679 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1680 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1681 tsk_set_nagle(tsk); 1682 __skb_queue_purge(&sk->sk_write_queue); 1683 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1684 return; 1685 1686 /* Fall back to message based flow control */ 1687 tsk->rcv_win = FLOWCTL_MSG_WIN; 1688 tsk->snd_win = FLOWCTL_MSG_WIN; 1689 } 1690 1691 /** 1692 * tipc_sk_set_orig_addr - capture sender's address for received message 1693 * @m: descriptor for message info 1694 * @skb: received message 1695 * 1696 * Note: Address is not captured if not requested by receiver. 1697 */ 1698 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1699 { 1700 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1701 struct tipc_msg *hdr = buf_msg(skb); 1702 1703 if (!srcaddr) 1704 return; 1705 1706 srcaddr->sock.family = AF_TIPC; 1707 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR; 1708 srcaddr->sock.scope = 0; 1709 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1710 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1711 srcaddr->sock.addr.name.domain = 0; 1712 m->msg_namelen = sizeof(struct sockaddr_tipc); 1713 1714 if (!msg_in_group(hdr)) 1715 return; 1716 1717 /* Group message users may also want to know sending member's id */ 1718 srcaddr->member.family = AF_TIPC; 1719 srcaddr->member.addrtype = TIPC_SERVICE_ADDR; 1720 srcaddr->member.scope = 0; 1721 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1722 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1723 srcaddr->member.addr.name.domain = 0; 1724 m->msg_namelen = sizeof(*srcaddr); 1725 } 1726 1727 /** 1728 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1729 * @m: descriptor for message info 1730 * @skb: received message buffer 1731 * @tsk: TIPC port associated with message 1732 * 1733 * Note: Ancillary data is not captured if not requested by receiver. 1734 * 1735 * Return: 0 if successful, otherwise errno 1736 */ 1737 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1738 struct tipc_sock *tsk) 1739 { 1740 struct tipc_msg *msg; 1741 u32 anc_data[3]; 1742 u32 err; 1743 u32 dest_type; 1744 int has_name; 1745 int res; 1746 1747 if (likely(m->msg_controllen == 0)) 1748 return 0; 1749 msg = buf_msg(skb); 1750 1751 /* Optionally capture errored message object(s) */ 1752 err = msg ? msg_errcode(msg) : 0; 1753 if (unlikely(err)) { 1754 anc_data[0] = err; 1755 anc_data[1] = msg_data_sz(msg); 1756 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); 1757 if (res) 1758 return res; 1759 if (anc_data[1]) { 1760 if (skb_linearize(skb)) 1761 return -ENOMEM; 1762 msg = buf_msg(skb); 1763 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], 1764 msg_data(msg)); 1765 if (res) 1766 return res; 1767 } 1768 } 1769 1770 /* Optionally capture message destination object */ 1771 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; 1772 switch (dest_type) { 1773 case TIPC_NAMED_MSG: 1774 has_name = 1; 1775 anc_data[0] = msg_nametype(msg); 1776 anc_data[1] = msg_namelower(msg); 1777 anc_data[2] = msg_namelower(msg); 1778 break; 1779 case TIPC_MCAST_MSG: 1780 has_name = 1; 1781 anc_data[0] = msg_nametype(msg); 1782 anc_data[1] = msg_namelower(msg); 1783 anc_data[2] = msg_nameupper(msg); 1784 break; 1785 case TIPC_CONN_MSG: 1786 has_name = (tsk->conn_type != 0); 1787 anc_data[0] = tsk->conn_type; 1788 anc_data[1] = tsk->conn_instance; 1789 anc_data[2] = tsk->conn_instance; 1790 break; 1791 default: 1792 has_name = 0; 1793 } 1794 if (has_name) { 1795 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); 1796 if (res) 1797 return res; 1798 } 1799 1800 return 0; 1801 } 1802 1803 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1804 { 1805 struct sock *sk = &tsk->sk; 1806 struct sk_buff *skb = NULL; 1807 struct tipc_msg *msg; 1808 u32 peer_port = tsk_peer_port(tsk); 1809 u32 dnode = tsk_peer_node(tsk); 1810 1811 if (!tipc_sk_connected(sk)) 1812 return NULL; 1813 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1814 dnode, tsk_own_node(tsk), peer_port, 1815 tsk->portid, TIPC_OK); 1816 if (!skb) 1817 return NULL; 1818 msg = buf_msg(skb); 1819 msg_set_conn_ack(msg, tsk->rcv_unacked); 1820 tsk->rcv_unacked = 0; 1821 1822 /* Adjust to and advertize the correct window limit */ 1823 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1824 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1825 msg_set_adv_win(msg, tsk->rcv_win); 1826 } 1827 return skb; 1828 } 1829 1830 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1831 { 1832 struct sk_buff *skb; 1833 1834 skb = tipc_sk_build_ack(tsk); 1835 if (!skb) 1836 return; 1837 1838 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1839 msg_link_selector(buf_msg(skb))); 1840 } 1841 1842 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1843 { 1844 struct sock *sk = sock->sk; 1845 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1846 long timeo = *timeop; 1847 int err = sock_error(sk); 1848 1849 if (err) 1850 return err; 1851 1852 for (;;) { 1853 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1854 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1855 err = -ENOTCONN; 1856 break; 1857 } 1858 add_wait_queue(sk_sleep(sk), &wait); 1859 release_sock(sk); 1860 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1861 sched_annotate_sleep(); 1862 lock_sock(sk); 1863 remove_wait_queue(sk_sleep(sk), &wait); 1864 } 1865 err = 0; 1866 if (!skb_queue_empty(&sk->sk_receive_queue)) 1867 break; 1868 err = -EAGAIN; 1869 if (!timeo) 1870 break; 1871 err = sock_intr_errno(timeo); 1872 if (signal_pending(current)) 1873 break; 1874 1875 err = sock_error(sk); 1876 if (err) 1877 break; 1878 } 1879 *timeop = timeo; 1880 return err; 1881 } 1882 1883 /** 1884 * tipc_recvmsg - receive packet-oriented message 1885 * @sock: network socket 1886 * @m: descriptor for message info 1887 * @buflen: length of user buffer area 1888 * @flags: receive flags 1889 * 1890 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1891 * If the complete message doesn't fit in user area, truncate it. 1892 * 1893 * Return: size of returned message data, errno otherwise 1894 */ 1895 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1896 size_t buflen, int flags) 1897 { 1898 struct sock *sk = sock->sk; 1899 bool connected = !tipc_sk_type_connectionless(sk); 1900 struct tipc_sock *tsk = tipc_sk(sk); 1901 int rc, err, hlen, dlen, copy; 1902 struct sk_buff_head xmitq; 1903 struct tipc_msg *hdr; 1904 struct sk_buff *skb; 1905 bool grp_evt; 1906 long timeout; 1907 1908 /* Catch invalid receive requests */ 1909 if (unlikely(!buflen)) 1910 return -EINVAL; 1911 1912 lock_sock(sk); 1913 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1914 rc = -ENOTCONN; 1915 goto exit; 1916 } 1917 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1918 1919 /* Step rcv queue to first msg with data or error; wait if necessary */ 1920 do { 1921 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1922 if (unlikely(rc)) 1923 goto exit; 1924 skb = skb_peek(&sk->sk_receive_queue); 1925 hdr = buf_msg(skb); 1926 dlen = msg_data_sz(hdr); 1927 hlen = msg_hdr_sz(hdr); 1928 err = msg_errcode(hdr); 1929 grp_evt = msg_is_grp_evt(hdr); 1930 if (likely(dlen || err)) 1931 break; 1932 tsk_advance_rx_queue(sk); 1933 } while (1); 1934 1935 /* Collect msg meta data, including error code and rejected data */ 1936 tipc_sk_set_orig_addr(m, skb); 1937 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1938 if (unlikely(rc)) 1939 goto exit; 1940 hdr = buf_msg(skb); 1941 1942 /* Capture data if non-error msg, otherwise just set return value */ 1943 if (likely(!err)) { 1944 copy = min_t(int, dlen, buflen); 1945 if (unlikely(copy != dlen)) 1946 m->msg_flags |= MSG_TRUNC; 1947 rc = skb_copy_datagram_msg(skb, hlen, m, copy); 1948 } else { 1949 copy = 0; 1950 rc = 0; 1951 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) 1952 rc = -ECONNRESET; 1953 } 1954 if (unlikely(rc)) 1955 goto exit; 1956 1957 /* Mark message as group event if applicable */ 1958 if (unlikely(grp_evt)) { 1959 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1960 m->msg_flags |= MSG_EOR; 1961 m->msg_flags |= MSG_OOB; 1962 copy = 0; 1963 } 1964 1965 /* Caption of data or error code/rejected data was successful */ 1966 if (unlikely(flags & MSG_PEEK)) 1967 goto exit; 1968 1969 /* Send group flow control advertisement when applicable */ 1970 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1971 __skb_queue_head_init(&xmitq); 1972 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1973 msg_orignode(hdr), msg_origport(hdr), 1974 &xmitq); 1975 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1976 } 1977 1978 tsk_advance_rx_queue(sk); 1979 1980 if (likely(!connected)) 1981 goto exit; 1982 1983 /* Send connection flow control advertisement when applicable */ 1984 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1985 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1986 tipc_sk_send_ack(tsk); 1987 exit: 1988 release_sock(sk); 1989 return rc ? rc : copy; 1990 } 1991 1992 /** 1993 * tipc_recvstream - receive stream-oriented data 1994 * @sock: network socket 1995 * @m: descriptor for message info 1996 * @buflen: total size of user buffer area 1997 * @flags: receive flags 1998 * 1999 * Used for SOCK_STREAM messages only. If not enough data is available 2000 * will optionally wait for more; never truncates data. 2001 * 2002 * Return: size of returned message data, errno otherwise 2003 */ 2004 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 2005 size_t buflen, int flags) 2006 { 2007 struct sock *sk = sock->sk; 2008 struct tipc_sock *tsk = tipc_sk(sk); 2009 struct sk_buff *skb; 2010 struct tipc_msg *hdr; 2011 struct tipc_skb_cb *skb_cb; 2012 bool peek = flags & MSG_PEEK; 2013 int offset, required, copy, copied = 0; 2014 int hlen, dlen, err, rc; 2015 long timeout; 2016 2017 /* Catch invalid receive attempts */ 2018 if (unlikely(!buflen)) 2019 return -EINVAL; 2020 2021 lock_sock(sk); 2022 2023 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2024 rc = -ENOTCONN; 2025 goto exit; 2026 } 2027 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2028 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2029 2030 do { 2031 /* Look at first msg in receive queue; wait if necessary */ 2032 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2033 if (unlikely(rc)) 2034 break; 2035 skb = skb_peek(&sk->sk_receive_queue); 2036 skb_cb = TIPC_SKB_CB(skb); 2037 hdr = buf_msg(skb); 2038 dlen = msg_data_sz(hdr); 2039 hlen = msg_hdr_sz(hdr); 2040 err = msg_errcode(hdr); 2041 2042 /* Discard any empty non-errored (SYN-) message */ 2043 if (unlikely(!dlen && !err)) { 2044 tsk_advance_rx_queue(sk); 2045 continue; 2046 } 2047 2048 /* Collect msg meta data, incl. error code and rejected data */ 2049 if (!copied) { 2050 tipc_sk_set_orig_addr(m, skb); 2051 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2052 if (rc) 2053 break; 2054 hdr = buf_msg(skb); 2055 } 2056 2057 /* Copy data if msg ok, otherwise return error/partial data */ 2058 if (likely(!err)) { 2059 offset = skb_cb->bytes_read; 2060 copy = min_t(int, dlen - offset, buflen - copied); 2061 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2062 if (unlikely(rc)) 2063 break; 2064 copied += copy; 2065 offset += copy; 2066 if (unlikely(offset < dlen)) { 2067 if (!peek) 2068 skb_cb->bytes_read = offset; 2069 break; 2070 } 2071 } else { 2072 rc = 0; 2073 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2074 rc = -ECONNRESET; 2075 if (copied || rc) 2076 break; 2077 } 2078 2079 if (unlikely(peek)) 2080 break; 2081 2082 tsk_advance_rx_queue(sk); 2083 2084 /* Send connection flow control advertisement when applicable */ 2085 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2086 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2087 tipc_sk_send_ack(tsk); 2088 2089 /* Exit if all requested data or FIN/error received */ 2090 if (copied == buflen || err) 2091 break; 2092 2093 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2094 exit: 2095 release_sock(sk); 2096 return copied ? copied : rc; 2097 } 2098 2099 /** 2100 * tipc_write_space - wake up thread if port congestion is released 2101 * @sk: socket 2102 */ 2103 static void tipc_write_space(struct sock *sk) 2104 { 2105 struct socket_wq *wq; 2106 2107 rcu_read_lock(); 2108 wq = rcu_dereference(sk->sk_wq); 2109 if (skwq_has_sleeper(wq)) 2110 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2111 EPOLLWRNORM | EPOLLWRBAND); 2112 rcu_read_unlock(); 2113 } 2114 2115 /** 2116 * tipc_data_ready - wake up threads to indicate messages have been received 2117 * @sk: socket 2118 */ 2119 static void tipc_data_ready(struct sock *sk) 2120 { 2121 struct socket_wq *wq; 2122 2123 rcu_read_lock(); 2124 wq = rcu_dereference(sk->sk_wq); 2125 if (skwq_has_sleeper(wq)) 2126 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2127 EPOLLRDNORM | EPOLLRDBAND); 2128 rcu_read_unlock(); 2129 } 2130 2131 static void tipc_sock_destruct(struct sock *sk) 2132 { 2133 __skb_queue_purge(&sk->sk_receive_queue); 2134 } 2135 2136 static void tipc_sk_proto_rcv(struct sock *sk, 2137 struct sk_buff_head *inputq, 2138 struct sk_buff_head *xmitq) 2139 { 2140 struct sk_buff *skb = __skb_dequeue(inputq); 2141 struct tipc_sock *tsk = tipc_sk(sk); 2142 struct tipc_msg *hdr = buf_msg(skb); 2143 struct tipc_group *grp = tsk->group; 2144 bool wakeup = false; 2145 2146 switch (msg_user(hdr)) { 2147 case CONN_MANAGER: 2148 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2149 return; 2150 case SOCK_WAKEUP: 2151 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2152 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2153 smp_wmb(); 2154 tsk->cong_link_cnt--; 2155 wakeup = true; 2156 tipc_sk_push_backlog(tsk, false); 2157 break; 2158 case GROUP_PROTOCOL: 2159 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2160 break; 2161 case TOP_SRV: 2162 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2163 hdr, inputq, xmitq); 2164 break; 2165 default: 2166 break; 2167 } 2168 2169 if (wakeup) 2170 sk->sk_write_space(sk); 2171 2172 kfree_skb(skb); 2173 } 2174 2175 /** 2176 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2177 * @tsk: TIPC socket 2178 * @skb: pointer to message buffer. 2179 * @xmitq: for Nagle ACK if any 2180 * Return: true if message should be added to receive queue, false otherwise 2181 */ 2182 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2183 struct sk_buff_head *xmitq) 2184 { 2185 struct sock *sk = &tsk->sk; 2186 struct net *net = sock_net(sk); 2187 struct tipc_msg *hdr = buf_msg(skb); 2188 bool con_msg = msg_connected(hdr); 2189 u32 pport = tsk_peer_port(tsk); 2190 u32 pnode = tsk_peer_node(tsk); 2191 u32 oport = msg_origport(hdr); 2192 u32 onode = msg_orignode(hdr); 2193 int err = msg_errcode(hdr); 2194 unsigned long delay; 2195 2196 if (unlikely(msg_mcast(hdr))) 2197 return false; 2198 tsk->oneway = 0; 2199 2200 switch (sk->sk_state) { 2201 case TIPC_CONNECTING: 2202 /* Setup ACK */ 2203 if (likely(con_msg)) { 2204 if (err) 2205 break; 2206 tipc_sk_finish_conn(tsk, oport, onode); 2207 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2208 /* ACK+ message with data is added to receive queue */ 2209 if (msg_data_sz(hdr)) 2210 return true; 2211 /* Empty ACK-, - wake up sleeping connect() and drop */ 2212 sk->sk_state_change(sk); 2213 msg_set_dest_droppable(hdr, 1); 2214 return false; 2215 } 2216 /* Ignore connectionless message if not from listening socket */ 2217 if (oport != pport || onode != pnode) 2218 return false; 2219 2220 /* Rejected SYN */ 2221 if (err != TIPC_ERR_OVERLOAD) 2222 break; 2223 2224 /* Prepare for new setup attempt if we have a SYN clone */ 2225 if (skb_queue_empty(&sk->sk_write_queue)) 2226 break; 2227 get_random_bytes(&delay, 2); 2228 delay %= (tsk->conn_timeout / 4); 2229 delay = msecs_to_jiffies(delay + 100); 2230 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2231 return false; 2232 case TIPC_OPEN: 2233 case TIPC_DISCONNECTING: 2234 return false; 2235 case TIPC_LISTEN: 2236 /* Accept only SYN message */ 2237 if (!msg_is_syn(hdr) && 2238 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2239 return false; 2240 if (!con_msg && !err) 2241 return true; 2242 return false; 2243 case TIPC_ESTABLISHED: 2244 if (!skb_queue_empty(&sk->sk_write_queue)) 2245 tipc_sk_push_backlog(tsk, false); 2246 /* Accept only connection-based messages sent by peer */ 2247 if (likely(con_msg && !err && pport == oport && 2248 pnode == onode)) { 2249 if (msg_ack_required(hdr)) { 2250 struct sk_buff *skb; 2251 2252 skb = tipc_sk_build_ack(tsk); 2253 if (skb) { 2254 msg_set_nagle_ack(buf_msg(skb)); 2255 __skb_queue_tail(xmitq, skb); 2256 } 2257 } 2258 return true; 2259 } 2260 if (!tsk_peer_msg(tsk, hdr)) 2261 return false; 2262 if (!err) 2263 return true; 2264 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2265 tipc_node_remove_conn(net, pnode, tsk->portid); 2266 sk->sk_state_change(sk); 2267 return true; 2268 default: 2269 pr_err("Unknown sk_state %u\n", sk->sk_state); 2270 } 2271 /* Abort connection setup attempt */ 2272 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2273 sk->sk_err = ECONNREFUSED; 2274 sk->sk_state_change(sk); 2275 return true; 2276 } 2277 2278 /** 2279 * rcvbuf_limit - get proper overload limit of socket receive queue 2280 * @sk: socket 2281 * @skb: message 2282 * 2283 * For connection oriented messages, irrespective of importance, 2284 * default queue limit is 2 MB. 2285 * 2286 * For connectionless messages, queue limits are based on message 2287 * importance as follows: 2288 * 2289 * TIPC_LOW_IMPORTANCE (2 MB) 2290 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2291 * TIPC_HIGH_IMPORTANCE (8 MB) 2292 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2293 * 2294 * Return: overload limit according to corresponding message importance 2295 */ 2296 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2297 { 2298 struct tipc_sock *tsk = tipc_sk(sk); 2299 struct tipc_msg *hdr = buf_msg(skb); 2300 2301 if (unlikely(msg_in_group(hdr))) 2302 return READ_ONCE(sk->sk_rcvbuf); 2303 2304 if (unlikely(!msg_connected(hdr))) 2305 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2306 2307 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2308 return READ_ONCE(sk->sk_rcvbuf); 2309 2310 return FLOWCTL_MSG_LIM; 2311 } 2312 2313 /** 2314 * tipc_sk_filter_rcv - validate incoming message 2315 * @sk: socket 2316 * @skb: pointer to message. 2317 * @xmitq: output message area (FIXME) 2318 * 2319 * Enqueues message on receive queue if acceptable; optionally handles 2320 * disconnect indication for a connected socket. 2321 * 2322 * Called with socket lock already taken 2323 */ 2324 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2325 struct sk_buff_head *xmitq) 2326 { 2327 bool sk_conn = !tipc_sk_type_connectionless(sk); 2328 struct tipc_sock *tsk = tipc_sk(sk); 2329 struct tipc_group *grp = tsk->group; 2330 struct tipc_msg *hdr = buf_msg(skb); 2331 struct net *net = sock_net(sk); 2332 struct sk_buff_head inputq; 2333 int mtyp = msg_type(hdr); 2334 int limit, err = TIPC_OK; 2335 2336 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2337 TIPC_SKB_CB(skb)->bytes_read = 0; 2338 __skb_queue_head_init(&inputq); 2339 __skb_queue_tail(&inputq, skb); 2340 2341 if (unlikely(!msg_isdata(hdr))) 2342 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2343 2344 if (unlikely(grp)) 2345 tipc_group_filter_msg(grp, &inputq, xmitq); 2346 2347 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2348 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2349 2350 /* Validate and add to receive buffer if there is space */ 2351 while ((skb = __skb_dequeue(&inputq))) { 2352 hdr = buf_msg(skb); 2353 limit = rcvbuf_limit(sk, skb); 2354 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2355 (!sk_conn && msg_connected(hdr)) || 2356 (!grp && msg_in_group(hdr))) 2357 err = TIPC_ERR_NO_PORT; 2358 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2359 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2360 "err_overload2!"); 2361 atomic_inc(&sk->sk_drops); 2362 err = TIPC_ERR_OVERLOAD; 2363 } 2364 2365 if (unlikely(err)) { 2366 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2367 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2368 "@filter_rcv!"); 2369 __skb_queue_tail(xmitq, skb); 2370 } 2371 err = TIPC_OK; 2372 continue; 2373 } 2374 __skb_queue_tail(&sk->sk_receive_queue, skb); 2375 skb_set_owner_r(skb, sk); 2376 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2377 "rcvq >90% allocated!"); 2378 sk->sk_data_ready(sk); 2379 } 2380 } 2381 2382 /** 2383 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2384 * @sk: socket 2385 * @skb: message 2386 * 2387 * Caller must hold socket lock 2388 */ 2389 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2390 { 2391 unsigned int before = sk_rmem_alloc_get(sk); 2392 struct sk_buff_head xmitq; 2393 unsigned int added; 2394 2395 __skb_queue_head_init(&xmitq); 2396 2397 tipc_sk_filter_rcv(sk, skb, &xmitq); 2398 added = sk_rmem_alloc_get(sk) - before; 2399 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2400 2401 /* Send pending response/rejected messages, if any */ 2402 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2403 return 0; 2404 } 2405 2406 /** 2407 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2408 * inputq and try adding them to socket or backlog queue 2409 * @inputq: list of incoming buffers with potentially different destinations 2410 * @sk: socket where the buffers should be enqueued 2411 * @dport: port number for the socket 2412 * @xmitq: output queue 2413 * 2414 * Caller must hold socket lock 2415 */ 2416 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2417 u32 dport, struct sk_buff_head *xmitq) 2418 { 2419 unsigned long time_limit = jiffies + 2; 2420 struct sk_buff *skb; 2421 unsigned int lim; 2422 atomic_t *dcnt; 2423 u32 onode; 2424 2425 while (skb_queue_len(inputq)) { 2426 if (unlikely(time_after_eq(jiffies, time_limit))) 2427 return; 2428 2429 skb = tipc_skb_dequeue(inputq, dport); 2430 if (unlikely(!skb)) 2431 return; 2432 2433 /* Add message directly to receive queue if possible */ 2434 if (!sock_owned_by_user(sk)) { 2435 tipc_sk_filter_rcv(sk, skb, xmitq); 2436 continue; 2437 } 2438 2439 /* Try backlog, compensating for double-counted bytes */ 2440 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2441 if (!sk->sk_backlog.len) 2442 atomic_set(dcnt, 0); 2443 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2444 if (likely(!sk_add_backlog(sk, skb, lim))) { 2445 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2446 "bklg & rcvq >90% allocated!"); 2447 continue; 2448 } 2449 2450 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2451 /* Overload => reject message back to sender */ 2452 onode = tipc_own_addr(sock_net(sk)); 2453 atomic_inc(&sk->sk_drops); 2454 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2455 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2456 "@sk_enqueue!"); 2457 __skb_queue_tail(xmitq, skb); 2458 } 2459 break; 2460 } 2461 } 2462 2463 /** 2464 * tipc_sk_rcv - handle a chain of incoming buffers 2465 * @net: the associated network namespace 2466 * @inputq: buffer list containing the buffers 2467 * Consumes all buffers in list until inputq is empty 2468 * Note: may be called in multiple threads referring to the same queue 2469 */ 2470 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2471 { 2472 struct sk_buff_head xmitq; 2473 u32 dnode, dport = 0; 2474 int err; 2475 struct tipc_sock *tsk; 2476 struct sock *sk; 2477 struct sk_buff *skb; 2478 2479 __skb_queue_head_init(&xmitq); 2480 while (skb_queue_len(inputq)) { 2481 dport = tipc_skb_peek_port(inputq, dport); 2482 tsk = tipc_sk_lookup(net, dport); 2483 2484 if (likely(tsk)) { 2485 sk = &tsk->sk; 2486 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2487 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2488 spin_unlock_bh(&sk->sk_lock.slock); 2489 } 2490 /* Send pending response/rejected messages, if any */ 2491 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2492 sock_put(sk); 2493 continue; 2494 } 2495 /* No destination socket => dequeue skb if still there */ 2496 skb = tipc_skb_dequeue(inputq, dport); 2497 if (!skb) 2498 return; 2499 2500 /* Try secondary lookup if unresolved named message */ 2501 err = TIPC_ERR_NO_PORT; 2502 if (tipc_msg_lookup_dest(net, skb, &err)) 2503 goto xmit; 2504 2505 /* Prepare for message rejection */ 2506 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2507 continue; 2508 2509 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2510 xmit: 2511 dnode = msg_destnode(buf_msg(skb)); 2512 tipc_node_xmit_skb(net, skb, dnode, dport); 2513 } 2514 } 2515 2516 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2517 { 2518 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2519 struct sock *sk = sock->sk; 2520 int done; 2521 2522 do { 2523 int err = sock_error(sk); 2524 if (err) 2525 return err; 2526 if (!*timeo_p) 2527 return -ETIMEDOUT; 2528 if (signal_pending(current)) 2529 return sock_intr_errno(*timeo_p); 2530 if (sk->sk_state == TIPC_DISCONNECTING) 2531 break; 2532 2533 add_wait_queue(sk_sleep(sk), &wait); 2534 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2535 &wait); 2536 remove_wait_queue(sk_sleep(sk), &wait); 2537 } while (!done); 2538 return 0; 2539 } 2540 2541 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2542 { 2543 if (addr->family != AF_TIPC) 2544 return false; 2545 if (addr->addrtype == TIPC_SERVICE_RANGE) 2546 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2547 return (addr->addrtype == TIPC_SERVICE_ADDR || 2548 addr->addrtype == TIPC_SOCKET_ADDR); 2549 } 2550 2551 /** 2552 * tipc_connect - establish a connection to another TIPC port 2553 * @sock: socket structure 2554 * @dest: socket address for destination port 2555 * @destlen: size of socket address data structure 2556 * @flags: file-related flags associated with socket 2557 * 2558 * Return: 0 on success, errno otherwise 2559 */ 2560 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2561 int destlen, int flags) 2562 { 2563 struct sock *sk = sock->sk; 2564 struct tipc_sock *tsk = tipc_sk(sk); 2565 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2566 struct msghdr m = {NULL,}; 2567 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2568 int previous; 2569 int res = 0; 2570 2571 if (destlen != sizeof(struct sockaddr_tipc)) 2572 return -EINVAL; 2573 2574 lock_sock(sk); 2575 2576 if (tsk->group) { 2577 res = -EINVAL; 2578 goto exit; 2579 } 2580 2581 if (dst->family == AF_UNSPEC) { 2582 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2583 if (!tipc_sk_type_connectionless(sk)) 2584 res = -EINVAL; 2585 goto exit; 2586 } 2587 if (!tipc_sockaddr_is_sane(dst)) { 2588 res = -EINVAL; 2589 goto exit; 2590 } 2591 /* DGRAM/RDM connect(), just save the destaddr */ 2592 if (tipc_sk_type_connectionless(sk)) { 2593 memcpy(&tsk->peer, dest, destlen); 2594 goto exit; 2595 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2596 res = -EINVAL; 2597 goto exit; 2598 } 2599 2600 previous = sk->sk_state; 2601 2602 switch (sk->sk_state) { 2603 case TIPC_OPEN: 2604 /* Send a 'SYN-' to destination */ 2605 m.msg_name = dest; 2606 m.msg_namelen = destlen; 2607 2608 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2609 * indicate send_msg() is never blocked. 2610 */ 2611 if (!timeout) 2612 m.msg_flags = MSG_DONTWAIT; 2613 2614 res = __tipc_sendmsg(sock, &m, 0); 2615 if ((res < 0) && (res != -EWOULDBLOCK)) 2616 goto exit; 2617 2618 /* Just entered TIPC_CONNECTING state; the only 2619 * difference is that return value in non-blocking 2620 * case is EINPROGRESS, rather than EALREADY. 2621 */ 2622 res = -EINPROGRESS; 2623 fallthrough; 2624 case TIPC_CONNECTING: 2625 if (!timeout) { 2626 if (previous == TIPC_CONNECTING) 2627 res = -EALREADY; 2628 goto exit; 2629 } 2630 timeout = msecs_to_jiffies(timeout); 2631 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2632 res = tipc_wait_for_connect(sock, &timeout); 2633 break; 2634 case TIPC_ESTABLISHED: 2635 res = -EISCONN; 2636 break; 2637 default: 2638 res = -EINVAL; 2639 } 2640 2641 exit: 2642 release_sock(sk); 2643 return res; 2644 } 2645 2646 /** 2647 * tipc_listen - allow socket to listen for incoming connections 2648 * @sock: socket structure 2649 * @len: (unused) 2650 * 2651 * Return: 0 on success, errno otherwise 2652 */ 2653 static int tipc_listen(struct socket *sock, int len) 2654 { 2655 struct sock *sk = sock->sk; 2656 int res; 2657 2658 lock_sock(sk); 2659 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2660 release_sock(sk); 2661 2662 return res; 2663 } 2664 2665 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2666 { 2667 struct sock *sk = sock->sk; 2668 DEFINE_WAIT(wait); 2669 int err; 2670 2671 /* True wake-one mechanism for incoming connections: only 2672 * one process gets woken up, not the 'whole herd'. 2673 * Since we do not 'race & poll' for established sockets 2674 * anymore, the common case will execute the loop only once. 2675 */ 2676 for (;;) { 2677 prepare_to_wait_exclusive(sk_sleep(sk), &wait, 2678 TASK_INTERRUPTIBLE); 2679 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2680 release_sock(sk); 2681 timeo = schedule_timeout(timeo); 2682 lock_sock(sk); 2683 } 2684 err = 0; 2685 if (!skb_queue_empty(&sk->sk_receive_queue)) 2686 break; 2687 err = -EAGAIN; 2688 if (!timeo) 2689 break; 2690 err = sock_intr_errno(timeo); 2691 if (signal_pending(current)) 2692 break; 2693 } 2694 finish_wait(sk_sleep(sk), &wait); 2695 return err; 2696 } 2697 2698 /** 2699 * tipc_accept - wait for connection request 2700 * @sock: listening socket 2701 * @new_sock: new socket that is to be connected 2702 * @flags: file-related flags associated with socket 2703 * @kern: caused by kernel or by userspace? 2704 * 2705 * Return: 0 on success, errno otherwise 2706 */ 2707 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2708 bool kern) 2709 { 2710 struct sock *new_sk, *sk = sock->sk; 2711 struct sk_buff *buf; 2712 struct tipc_sock *new_tsock; 2713 struct tipc_msg *msg; 2714 long timeo; 2715 int res; 2716 2717 lock_sock(sk); 2718 2719 if (sk->sk_state != TIPC_LISTEN) { 2720 res = -EINVAL; 2721 goto exit; 2722 } 2723 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2724 res = tipc_wait_for_accept(sock, timeo); 2725 if (res) 2726 goto exit; 2727 2728 buf = skb_peek(&sk->sk_receive_queue); 2729 2730 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2731 if (res) 2732 goto exit; 2733 security_sk_clone(sock->sk, new_sock->sk); 2734 2735 new_sk = new_sock->sk; 2736 new_tsock = tipc_sk(new_sk); 2737 msg = buf_msg(buf); 2738 2739 /* we lock on new_sk; but lockdep sees the lock on sk */ 2740 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2741 2742 /* 2743 * Reject any stray messages received by new socket 2744 * before the socket lock was taken (very, very unlikely) 2745 */ 2746 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2747 2748 /* Connect new socket to it's peer */ 2749 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2750 2751 tsk_set_importance(new_sk, msg_importance(msg)); 2752 if (msg_named(msg)) { 2753 new_tsock->conn_type = msg_nametype(msg); 2754 new_tsock->conn_instance = msg_nameinst(msg); 2755 } 2756 2757 /* 2758 * Respond to 'SYN-' by discarding it & returning 'ACK'-. 2759 * Respond to 'SYN+' by queuing it on new socket. 2760 */ 2761 if (!msg_data_sz(msg)) { 2762 struct msghdr m = {NULL,}; 2763 2764 tsk_advance_rx_queue(sk); 2765 __tipc_sendstream(new_sock, &m, 0); 2766 } else { 2767 __skb_dequeue(&sk->sk_receive_queue); 2768 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2769 skb_set_owner_r(buf, new_sk); 2770 } 2771 release_sock(new_sk); 2772 exit: 2773 release_sock(sk); 2774 return res; 2775 } 2776 2777 /** 2778 * tipc_shutdown - shutdown socket connection 2779 * @sock: socket structure 2780 * @how: direction to close (must be SHUT_RDWR) 2781 * 2782 * Terminates connection (if necessary), then purges socket's receive queue. 2783 * 2784 * Return: 0 on success, errno otherwise 2785 */ 2786 static int tipc_shutdown(struct socket *sock, int how) 2787 { 2788 struct sock *sk = sock->sk; 2789 int res; 2790 2791 if (how != SHUT_RDWR) 2792 return -EINVAL; 2793 2794 lock_sock(sk); 2795 2796 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2797 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2798 sk->sk_shutdown = SHUTDOWN_MASK; 2799 2800 if (sk->sk_state == TIPC_DISCONNECTING) { 2801 /* Discard any unreceived messages */ 2802 __skb_queue_purge(&sk->sk_receive_queue); 2803 2804 res = 0; 2805 } else { 2806 res = -ENOTCONN; 2807 } 2808 /* Wake up anyone sleeping in poll. */ 2809 sk->sk_state_change(sk); 2810 2811 release_sock(sk); 2812 return res; 2813 } 2814 2815 static void tipc_sk_check_probing_state(struct sock *sk, 2816 struct sk_buff_head *list) 2817 { 2818 struct tipc_sock *tsk = tipc_sk(sk); 2819 u32 pnode = tsk_peer_node(tsk); 2820 u32 pport = tsk_peer_port(tsk); 2821 u32 self = tsk_own_node(tsk); 2822 u32 oport = tsk->portid; 2823 struct sk_buff *skb; 2824 2825 if (tsk->probe_unacked) { 2826 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2827 sk->sk_err = ECONNABORTED; 2828 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2829 sk->sk_state_change(sk); 2830 return; 2831 } 2832 /* Prepare new probe */ 2833 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2834 pnode, self, pport, oport, TIPC_OK); 2835 if (skb) 2836 __skb_queue_tail(list, skb); 2837 tsk->probe_unacked = true; 2838 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2839 } 2840 2841 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2842 { 2843 struct tipc_sock *tsk = tipc_sk(sk); 2844 2845 /* Try again later if dest link is congested */ 2846 if (tsk->cong_link_cnt) { 2847 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2848 return; 2849 } 2850 /* Prepare SYN for retransmit */ 2851 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2852 } 2853 2854 static void tipc_sk_timeout(struct timer_list *t) 2855 { 2856 struct sock *sk = from_timer(sk, t, sk_timer); 2857 struct tipc_sock *tsk = tipc_sk(sk); 2858 u32 pnode = tsk_peer_node(tsk); 2859 struct sk_buff_head list; 2860 int rc = 0; 2861 2862 __skb_queue_head_init(&list); 2863 bh_lock_sock(sk); 2864 2865 /* Try again later if socket is busy */ 2866 if (sock_owned_by_user(sk)) { 2867 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2868 bh_unlock_sock(sk); 2869 sock_put(sk); 2870 return; 2871 } 2872 2873 if (sk->sk_state == TIPC_ESTABLISHED) 2874 tipc_sk_check_probing_state(sk, &list); 2875 else if (sk->sk_state == TIPC_CONNECTING) 2876 tipc_sk_retry_connect(sk, &list); 2877 2878 bh_unlock_sock(sk); 2879 2880 if (!skb_queue_empty(&list)) 2881 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2882 2883 /* SYN messages may cause link congestion */ 2884 if (rc == -ELINKCONG) { 2885 tipc_dest_push(&tsk->cong_links, pnode, 0); 2886 tsk->cong_link_cnt = 1; 2887 } 2888 sock_put(sk); 2889 } 2890 2891 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2892 { 2893 struct sock *sk = &tsk->sk; 2894 struct net *net = sock_net(sk); 2895 struct tipc_socket_addr skaddr; 2896 struct publication *p; 2897 u32 key; 2898 2899 if (tipc_sk_connected(sk)) 2900 return -EINVAL; 2901 key = tsk->portid + tsk->pub_count + 1; 2902 if (key == tsk->portid) 2903 return -EADDRINUSE; 2904 skaddr.ref = tsk->portid; 2905 skaddr.node = tipc_own_addr(net); 2906 p = tipc_nametbl_publish(net, ua, &skaddr, key); 2907 if (unlikely(!p)) 2908 return -EINVAL; 2909 2910 list_add(&p->binding_sock, &tsk->publications); 2911 tsk->pub_count++; 2912 tsk->published = true; 2913 return 0; 2914 } 2915 2916 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2917 { 2918 struct net *net = sock_net(&tsk->sk); 2919 struct publication *safe, *p; 2920 struct tipc_uaddr _ua; 2921 int rc = -EINVAL; 2922 2923 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) { 2924 if (!ua) { 2925 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope, 2926 p->sr.type, p->sr.lower, p->sr.upper); 2927 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key); 2928 continue; 2929 } 2930 /* Unbind specific publication */ 2931 if (p->scope != ua->scope) 2932 continue; 2933 if (p->sr.type != ua->sr.type) 2934 continue; 2935 if (p->sr.lower != ua->sr.lower) 2936 continue; 2937 if (p->sr.upper != ua->sr.upper) 2938 break; 2939 tipc_nametbl_withdraw(net, ua, &p->sk, p->key); 2940 rc = 0; 2941 break; 2942 } 2943 if (list_empty(&tsk->publications)) { 2944 tsk->published = 0; 2945 rc = 0; 2946 } 2947 return rc; 2948 } 2949 2950 /* tipc_sk_reinit: set non-zero address in all existing sockets 2951 * when we go from standalone to network mode. 2952 */ 2953 void tipc_sk_reinit(struct net *net) 2954 { 2955 struct tipc_net *tn = net_generic(net, tipc_net_id); 2956 struct rhashtable_iter iter; 2957 struct tipc_sock *tsk; 2958 struct tipc_msg *msg; 2959 2960 rhashtable_walk_enter(&tn->sk_rht, &iter); 2961 2962 do { 2963 rhashtable_walk_start(&iter); 2964 2965 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2966 sock_hold(&tsk->sk); 2967 rhashtable_walk_stop(&iter); 2968 lock_sock(&tsk->sk); 2969 msg = &tsk->phdr; 2970 msg_set_prevnode(msg, tipc_own_addr(net)); 2971 msg_set_orignode(msg, tipc_own_addr(net)); 2972 release_sock(&tsk->sk); 2973 rhashtable_walk_start(&iter); 2974 sock_put(&tsk->sk); 2975 } 2976 2977 rhashtable_walk_stop(&iter); 2978 } while (tsk == ERR_PTR(-EAGAIN)); 2979 2980 rhashtable_walk_exit(&iter); 2981 } 2982 2983 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2984 { 2985 struct tipc_net *tn = net_generic(net, tipc_net_id); 2986 struct tipc_sock *tsk; 2987 2988 rcu_read_lock(); 2989 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2990 if (tsk) 2991 sock_hold(&tsk->sk); 2992 rcu_read_unlock(); 2993 2994 return tsk; 2995 } 2996 2997 static int tipc_sk_insert(struct tipc_sock *tsk) 2998 { 2999 struct sock *sk = &tsk->sk; 3000 struct net *net = sock_net(sk); 3001 struct tipc_net *tn = net_generic(net, tipc_net_id); 3002 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 3003 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 3004 3005 while (remaining--) { 3006 portid++; 3007 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 3008 portid = TIPC_MIN_PORT; 3009 tsk->portid = portid; 3010 sock_hold(&tsk->sk); 3011 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 3012 tsk_rht_params)) 3013 return 0; 3014 sock_put(&tsk->sk); 3015 } 3016 3017 return -1; 3018 } 3019 3020 static void tipc_sk_remove(struct tipc_sock *tsk) 3021 { 3022 struct sock *sk = &tsk->sk; 3023 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3024 3025 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3026 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3027 __sock_put(sk); 3028 } 3029 } 3030 3031 static const struct rhashtable_params tsk_rht_params = { 3032 .nelem_hint = 192, 3033 .head_offset = offsetof(struct tipc_sock, node), 3034 .key_offset = offsetof(struct tipc_sock, portid), 3035 .key_len = sizeof(u32), /* portid */ 3036 .max_size = 1048576, 3037 .min_size = 256, 3038 .automatic_shrinking = true, 3039 }; 3040 3041 int tipc_sk_rht_init(struct net *net) 3042 { 3043 struct tipc_net *tn = net_generic(net, tipc_net_id); 3044 3045 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3046 } 3047 3048 void tipc_sk_rht_destroy(struct net *net) 3049 { 3050 struct tipc_net *tn = net_generic(net, tipc_net_id); 3051 3052 /* Wait for socket readers to complete */ 3053 synchronize_net(); 3054 3055 rhashtable_destroy(&tn->sk_rht); 3056 } 3057 3058 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3059 { 3060 struct net *net = sock_net(&tsk->sk); 3061 struct tipc_group *grp = tsk->group; 3062 struct tipc_msg *hdr = &tsk->phdr; 3063 struct tipc_uaddr ua; 3064 int rc; 3065 3066 if (mreq->type < TIPC_RESERVED_TYPES) 3067 return -EACCES; 3068 if (mreq->scope > TIPC_NODE_SCOPE) 3069 return -EINVAL; 3070 if (mreq->scope != TIPC_NODE_SCOPE) 3071 mreq->scope = TIPC_CLUSTER_SCOPE; 3072 if (grp) 3073 return -EACCES; 3074 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3075 if (!grp) 3076 return -ENOMEM; 3077 tsk->group = grp; 3078 msg_set_lookup_scope(hdr, mreq->scope); 3079 msg_set_nametype(hdr, mreq->type); 3080 msg_set_dest_droppable(hdr, true); 3081 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope, 3082 mreq->type, mreq->instance, mreq->instance); 3083 tipc_nametbl_build_group(net, grp, &ua); 3084 rc = tipc_sk_publish(tsk, &ua); 3085 if (rc) { 3086 tipc_group_delete(net, grp); 3087 tsk->group = NULL; 3088 return rc; 3089 } 3090 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3091 tsk->mc_method.rcast = true; 3092 tsk->mc_method.mandatory = true; 3093 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3094 return rc; 3095 } 3096 3097 static int tipc_sk_leave(struct tipc_sock *tsk) 3098 { 3099 struct net *net = sock_net(&tsk->sk); 3100 struct tipc_group *grp = tsk->group; 3101 struct tipc_uaddr ua; 3102 int scope; 3103 3104 if (!grp) 3105 return -EINVAL; 3106 ua.addrtype = TIPC_SERVICE_RANGE; 3107 tipc_group_self(grp, &ua.sr, &scope); 3108 ua.scope = scope; 3109 tipc_group_delete(net, grp); 3110 tsk->group = NULL; 3111 tipc_sk_withdraw(tsk, &ua); 3112 return 0; 3113 } 3114 3115 /** 3116 * tipc_setsockopt - set socket option 3117 * @sock: socket structure 3118 * @lvl: option level 3119 * @opt: option identifier 3120 * @ov: pointer to new option value 3121 * @ol: length of option value 3122 * 3123 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3124 * (to ease compatibility). 3125 * 3126 * Return: 0 on success, errno otherwise 3127 */ 3128 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3129 sockptr_t ov, unsigned int ol) 3130 { 3131 struct sock *sk = sock->sk; 3132 struct tipc_sock *tsk = tipc_sk(sk); 3133 struct tipc_group_req mreq; 3134 u32 value = 0; 3135 int res = 0; 3136 3137 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3138 return 0; 3139 if (lvl != SOL_TIPC) 3140 return -ENOPROTOOPT; 3141 3142 switch (opt) { 3143 case TIPC_IMPORTANCE: 3144 case TIPC_SRC_DROPPABLE: 3145 case TIPC_DEST_DROPPABLE: 3146 case TIPC_CONN_TIMEOUT: 3147 case TIPC_NODELAY: 3148 if (ol < sizeof(value)) 3149 return -EINVAL; 3150 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3151 return -EFAULT; 3152 break; 3153 case TIPC_GROUP_JOIN: 3154 if (ol < sizeof(mreq)) 3155 return -EINVAL; 3156 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3157 return -EFAULT; 3158 break; 3159 default: 3160 if (!sockptr_is_null(ov) || ol) 3161 return -EINVAL; 3162 } 3163 3164 lock_sock(sk); 3165 3166 switch (opt) { 3167 case TIPC_IMPORTANCE: 3168 res = tsk_set_importance(sk, value); 3169 break; 3170 case TIPC_SRC_DROPPABLE: 3171 if (sock->type != SOCK_STREAM) 3172 tsk_set_unreliable(tsk, value); 3173 else 3174 res = -ENOPROTOOPT; 3175 break; 3176 case TIPC_DEST_DROPPABLE: 3177 tsk_set_unreturnable(tsk, value); 3178 break; 3179 case TIPC_CONN_TIMEOUT: 3180 tipc_sk(sk)->conn_timeout = value; 3181 break; 3182 case TIPC_MCAST_BROADCAST: 3183 tsk->mc_method.rcast = false; 3184 tsk->mc_method.mandatory = true; 3185 break; 3186 case TIPC_MCAST_REPLICAST: 3187 tsk->mc_method.rcast = true; 3188 tsk->mc_method.mandatory = true; 3189 break; 3190 case TIPC_GROUP_JOIN: 3191 res = tipc_sk_join(tsk, &mreq); 3192 break; 3193 case TIPC_GROUP_LEAVE: 3194 res = tipc_sk_leave(tsk); 3195 break; 3196 case TIPC_NODELAY: 3197 tsk->nodelay = !!value; 3198 tsk_set_nagle(tsk); 3199 break; 3200 default: 3201 res = -EINVAL; 3202 } 3203 3204 release_sock(sk); 3205 3206 return res; 3207 } 3208 3209 /** 3210 * tipc_getsockopt - get socket option 3211 * @sock: socket structure 3212 * @lvl: option level 3213 * @opt: option identifier 3214 * @ov: receptacle for option value 3215 * @ol: receptacle for length of option value 3216 * 3217 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3218 * (to ease compatibility). 3219 * 3220 * Return: 0 on success, errno otherwise 3221 */ 3222 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3223 char __user *ov, int __user *ol) 3224 { 3225 struct sock *sk = sock->sk; 3226 struct tipc_sock *tsk = tipc_sk(sk); 3227 struct tipc_service_range seq; 3228 int len, scope; 3229 u32 value; 3230 int res; 3231 3232 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3233 return put_user(0, ol); 3234 if (lvl != SOL_TIPC) 3235 return -ENOPROTOOPT; 3236 res = get_user(len, ol); 3237 if (res) 3238 return res; 3239 3240 lock_sock(sk); 3241 3242 switch (opt) { 3243 case TIPC_IMPORTANCE: 3244 value = tsk_importance(tsk); 3245 break; 3246 case TIPC_SRC_DROPPABLE: 3247 value = tsk_unreliable(tsk); 3248 break; 3249 case TIPC_DEST_DROPPABLE: 3250 value = tsk_unreturnable(tsk); 3251 break; 3252 case TIPC_CONN_TIMEOUT: 3253 value = tsk->conn_timeout; 3254 /* no need to set "res", since already 0 at this point */ 3255 break; 3256 case TIPC_NODE_RECVQ_DEPTH: 3257 value = 0; /* was tipc_queue_size, now obsolete */ 3258 break; 3259 case TIPC_SOCK_RECVQ_DEPTH: 3260 value = skb_queue_len(&sk->sk_receive_queue); 3261 break; 3262 case TIPC_SOCK_RECVQ_USED: 3263 value = sk_rmem_alloc_get(sk); 3264 break; 3265 case TIPC_GROUP_JOIN: 3266 seq.type = 0; 3267 if (tsk->group) 3268 tipc_group_self(tsk->group, &seq, &scope); 3269 value = seq.type; 3270 break; 3271 default: 3272 res = -EINVAL; 3273 } 3274 3275 release_sock(sk); 3276 3277 if (res) 3278 return res; /* "get" failed */ 3279 3280 if (len < sizeof(value)) 3281 return -EINVAL; 3282 3283 if (copy_to_user(ov, &value, sizeof(value))) 3284 return -EFAULT; 3285 3286 return put_user(sizeof(value), ol); 3287 } 3288 3289 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3290 { 3291 struct net *net = sock_net(sock->sk); 3292 struct tipc_sioc_nodeid_req nr = {0}; 3293 struct tipc_sioc_ln_req lnr; 3294 void __user *argp = (void __user *)arg; 3295 3296 switch (cmd) { 3297 case SIOCGETLINKNAME: 3298 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3299 return -EFAULT; 3300 if (!tipc_node_get_linkname(net, 3301 lnr.bearer_id & 0xffff, lnr.peer, 3302 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3303 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3304 return -EFAULT; 3305 return 0; 3306 } 3307 return -EADDRNOTAVAIL; 3308 case SIOCGETNODEID: 3309 if (copy_from_user(&nr, argp, sizeof(nr))) 3310 return -EFAULT; 3311 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3312 return -EADDRNOTAVAIL; 3313 if (copy_to_user(argp, &nr, sizeof(nr))) 3314 return -EFAULT; 3315 return 0; 3316 default: 3317 return -ENOIOCTLCMD; 3318 } 3319 } 3320 3321 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3322 { 3323 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3324 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3325 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3326 3327 tsk1->peer.family = AF_TIPC; 3328 tsk1->peer.addrtype = TIPC_SOCKET_ADDR; 3329 tsk1->peer.scope = TIPC_NODE_SCOPE; 3330 tsk1->peer.addr.id.ref = tsk2->portid; 3331 tsk1->peer.addr.id.node = onode; 3332 tsk2->peer.family = AF_TIPC; 3333 tsk2->peer.addrtype = TIPC_SOCKET_ADDR; 3334 tsk2->peer.scope = TIPC_NODE_SCOPE; 3335 tsk2->peer.addr.id.ref = tsk1->portid; 3336 tsk2->peer.addr.id.node = onode; 3337 3338 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3339 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3340 return 0; 3341 } 3342 3343 /* Protocol switches for the various types of TIPC sockets */ 3344 3345 static const struct proto_ops msg_ops = { 3346 .owner = THIS_MODULE, 3347 .family = AF_TIPC, 3348 .release = tipc_release, 3349 .bind = tipc_bind, 3350 .connect = tipc_connect, 3351 .socketpair = tipc_socketpair, 3352 .accept = sock_no_accept, 3353 .getname = tipc_getname, 3354 .poll = tipc_poll, 3355 .ioctl = tipc_ioctl, 3356 .listen = sock_no_listen, 3357 .shutdown = tipc_shutdown, 3358 .setsockopt = tipc_setsockopt, 3359 .getsockopt = tipc_getsockopt, 3360 .sendmsg = tipc_sendmsg, 3361 .recvmsg = tipc_recvmsg, 3362 .mmap = sock_no_mmap, 3363 .sendpage = sock_no_sendpage 3364 }; 3365 3366 static const struct proto_ops packet_ops = { 3367 .owner = THIS_MODULE, 3368 .family = AF_TIPC, 3369 .release = tipc_release, 3370 .bind = tipc_bind, 3371 .connect = tipc_connect, 3372 .socketpair = tipc_socketpair, 3373 .accept = tipc_accept, 3374 .getname = tipc_getname, 3375 .poll = tipc_poll, 3376 .ioctl = tipc_ioctl, 3377 .listen = tipc_listen, 3378 .shutdown = tipc_shutdown, 3379 .setsockopt = tipc_setsockopt, 3380 .getsockopt = tipc_getsockopt, 3381 .sendmsg = tipc_send_packet, 3382 .recvmsg = tipc_recvmsg, 3383 .mmap = sock_no_mmap, 3384 .sendpage = sock_no_sendpage 3385 }; 3386 3387 static const struct proto_ops stream_ops = { 3388 .owner = THIS_MODULE, 3389 .family = AF_TIPC, 3390 .release = tipc_release, 3391 .bind = tipc_bind, 3392 .connect = tipc_connect, 3393 .socketpair = tipc_socketpair, 3394 .accept = tipc_accept, 3395 .getname = tipc_getname, 3396 .poll = tipc_poll, 3397 .ioctl = tipc_ioctl, 3398 .listen = tipc_listen, 3399 .shutdown = tipc_shutdown, 3400 .setsockopt = tipc_setsockopt, 3401 .getsockopt = tipc_getsockopt, 3402 .sendmsg = tipc_sendstream, 3403 .recvmsg = tipc_recvstream, 3404 .mmap = sock_no_mmap, 3405 .sendpage = sock_no_sendpage 3406 }; 3407 3408 static const struct net_proto_family tipc_family_ops = { 3409 .owner = THIS_MODULE, 3410 .family = AF_TIPC, 3411 .create = tipc_sk_create 3412 }; 3413 3414 static struct proto tipc_proto = { 3415 .name = "TIPC", 3416 .owner = THIS_MODULE, 3417 .obj_size = sizeof(struct tipc_sock), 3418 .sysctl_rmem = sysctl_tipc_rmem 3419 }; 3420 3421 /** 3422 * tipc_socket_init - initialize TIPC socket interface 3423 * 3424 * Return: 0 on success, errno otherwise 3425 */ 3426 int tipc_socket_init(void) 3427 { 3428 int res; 3429 3430 res = proto_register(&tipc_proto, 1); 3431 if (res) { 3432 pr_err("Failed to register TIPC protocol type\n"); 3433 goto out; 3434 } 3435 3436 res = sock_register(&tipc_family_ops); 3437 if (res) { 3438 pr_err("Failed to register TIPC socket type\n"); 3439 proto_unregister(&tipc_proto); 3440 goto out; 3441 } 3442 out: 3443 return res; 3444 } 3445 3446 /** 3447 * tipc_socket_stop - stop TIPC socket interface 3448 */ 3449 void tipc_socket_stop(void) 3450 { 3451 sock_unregister(tipc_family_ops.family); 3452 proto_unregister(&tipc_proto); 3453 } 3454 3455 /* Caller should hold socket lock for the passed tipc socket. */ 3456 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3457 { 3458 u32 peer_node; 3459 u32 peer_port; 3460 struct nlattr *nest; 3461 3462 peer_node = tsk_peer_node(tsk); 3463 peer_port = tsk_peer_port(tsk); 3464 3465 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3466 if (!nest) 3467 return -EMSGSIZE; 3468 3469 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3470 goto msg_full; 3471 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3472 goto msg_full; 3473 3474 if (tsk->conn_type != 0) { 3475 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3476 goto msg_full; 3477 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) 3478 goto msg_full; 3479 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) 3480 goto msg_full; 3481 } 3482 nla_nest_end(skb, nest); 3483 3484 return 0; 3485 3486 msg_full: 3487 nla_nest_cancel(skb, nest); 3488 3489 return -EMSGSIZE; 3490 } 3491 3492 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3493 *tsk) 3494 { 3495 struct net *net = sock_net(skb->sk); 3496 struct sock *sk = &tsk->sk; 3497 3498 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3499 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3500 return -EMSGSIZE; 3501 3502 if (tipc_sk_connected(sk)) { 3503 if (__tipc_nl_add_sk_con(skb, tsk)) 3504 return -EMSGSIZE; 3505 } else if (!list_empty(&tsk->publications)) { 3506 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3507 return -EMSGSIZE; 3508 } 3509 return 0; 3510 } 3511 3512 /* Caller should hold socket lock for the passed tipc socket. */ 3513 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3514 struct tipc_sock *tsk) 3515 { 3516 struct nlattr *attrs; 3517 void *hdr; 3518 3519 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3520 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3521 if (!hdr) 3522 goto msg_cancel; 3523 3524 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3525 if (!attrs) 3526 goto genlmsg_cancel; 3527 3528 if (__tipc_nl_add_sk_info(skb, tsk)) 3529 goto attr_msg_cancel; 3530 3531 nla_nest_end(skb, attrs); 3532 genlmsg_end(skb, hdr); 3533 3534 return 0; 3535 3536 attr_msg_cancel: 3537 nla_nest_cancel(skb, attrs); 3538 genlmsg_cancel: 3539 genlmsg_cancel(skb, hdr); 3540 msg_cancel: 3541 return -EMSGSIZE; 3542 } 3543 3544 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3545 int (*skb_handler)(struct sk_buff *skb, 3546 struct netlink_callback *cb, 3547 struct tipc_sock *tsk)) 3548 { 3549 struct rhashtable_iter *iter = (void *)cb->args[4]; 3550 struct tipc_sock *tsk; 3551 int err; 3552 3553 rhashtable_walk_start(iter); 3554 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3555 if (IS_ERR(tsk)) { 3556 err = PTR_ERR(tsk); 3557 if (err == -EAGAIN) { 3558 err = 0; 3559 continue; 3560 } 3561 break; 3562 } 3563 3564 sock_hold(&tsk->sk); 3565 rhashtable_walk_stop(iter); 3566 lock_sock(&tsk->sk); 3567 err = skb_handler(skb, cb, tsk); 3568 if (err) { 3569 release_sock(&tsk->sk); 3570 sock_put(&tsk->sk); 3571 goto out; 3572 } 3573 release_sock(&tsk->sk); 3574 rhashtable_walk_start(iter); 3575 sock_put(&tsk->sk); 3576 } 3577 rhashtable_walk_stop(iter); 3578 out: 3579 return skb->len; 3580 } 3581 EXPORT_SYMBOL(tipc_nl_sk_walk); 3582 3583 int tipc_dump_start(struct netlink_callback *cb) 3584 { 3585 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3586 } 3587 EXPORT_SYMBOL(tipc_dump_start); 3588 3589 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3590 { 3591 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3592 struct rhashtable_iter *iter = (void *)cb->args[4]; 3593 struct tipc_net *tn = tipc_net(net); 3594 3595 if (!iter) { 3596 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3597 if (!iter) 3598 return -ENOMEM; 3599 3600 cb->args[4] = (long)iter; 3601 } 3602 3603 rhashtable_walk_enter(&tn->sk_rht, iter); 3604 return 0; 3605 } 3606 3607 int tipc_dump_done(struct netlink_callback *cb) 3608 { 3609 struct rhashtable_iter *hti = (void *)cb->args[4]; 3610 3611 rhashtable_walk_exit(hti); 3612 kfree(hti); 3613 return 0; 3614 } 3615 EXPORT_SYMBOL(tipc_dump_done); 3616 3617 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3618 struct tipc_sock *tsk, u32 sk_filter_state, 3619 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3620 { 3621 struct sock *sk = &tsk->sk; 3622 struct nlattr *attrs; 3623 struct nlattr *stat; 3624 3625 /*filter response w.r.t sk_state*/ 3626 if (!(sk_filter_state & (1 << sk->sk_state))) 3627 return 0; 3628 3629 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3630 if (!attrs) 3631 goto msg_cancel; 3632 3633 if (__tipc_nl_add_sk_info(skb, tsk)) 3634 goto attr_msg_cancel; 3635 3636 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3637 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3638 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3639 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3640 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3641 sock_i_uid(sk))) || 3642 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3643 tipc_diag_gen_cookie(sk), 3644 TIPC_NLA_SOCK_PAD)) 3645 goto attr_msg_cancel; 3646 3647 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3648 if (!stat) 3649 goto attr_msg_cancel; 3650 3651 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3652 skb_queue_len(&sk->sk_receive_queue)) || 3653 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3654 skb_queue_len(&sk->sk_write_queue)) || 3655 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3656 atomic_read(&sk->sk_drops))) 3657 goto stat_msg_cancel; 3658 3659 if (tsk->cong_link_cnt && 3660 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3661 goto stat_msg_cancel; 3662 3663 if (tsk_conn_cong(tsk) && 3664 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3665 goto stat_msg_cancel; 3666 3667 nla_nest_end(skb, stat); 3668 3669 if (tsk->group) 3670 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3671 goto stat_msg_cancel; 3672 3673 nla_nest_end(skb, attrs); 3674 3675 return 0; 3676 3677 stat_msg_cancel: 3678 nla_nest_cancel(skb, stat); 3679 attr_msg_cancel: 3680 nla_nest_cancel(skb, attrs); 3681 msg_cancel: 3682 return -EMSGSIZE; 3683 } 3684 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3685 3686 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3687 { 3688 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3689 } 3690 3691 /* Caller should hold socket lock for the passed tipc socket. */ 3692 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3693 struct netlink_callback *cb, 3694 struct publication *publ) 3695 { 3696 void *hdr; 3697 struct nlattr *attrs; 3698 3699 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3700 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3701 if (!hdr) 3702 goto msg_cancel; 3703 3704 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3705 if (!attrs) 3706 goto genlmsg_cancel; 3707 3708 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3709 goto attr_msg_cancel; 3710 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type)) 3711 goto attr_msg_cancel; 3712 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower)) 3713 goto attr_msg_cancel; 3714 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper)) 3715 goto attr_msg_cancel; 3716 3717 nla_nest_end(skb, attrs); 3718 genlmsg_end(skb, hdr); 3719 3720 return 0; 3721 3722 attr_msg_cancel: 3723 nla_nest_cancel(skb, attrs); 3724 genlmsg_cancel: 3725 genlmsg_cancel(skb, hdr); 3726 msg_cancel: 3727 return -EMSGSIZE; 3728 } 3729 3730 /* Caller should hold socket lock for the passed tipc socket. */ 3731 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3732 struct netlink_callback *cb, 3733 struct tipc_sock *tsk, u32 *last_publ) 3734 { 3735 int err; 3736 struct publication *p; 3737 3738 if (*last_publ) { 3739 list_for_each_entry(p, &tsk->publications, binding_sock) { 3740 if (p->key == *last_publ) 3741 break; 3742 } 3743 if (p->key != *last_publ) { 3744 /* We never set seq or call nl_dump_check_consistent() 3745 * this means that setting prev_seq here will cause the 3746 * consistence check to fail in the netlink callback 3747 * handler. Resulting in the last NLMSG_DONE message 3748 * having the NLM_F_DUMP_INTR flag set. 3749 */ 3750 cb->prev_seq = 1; 3751 *last_publ = 0; 3752 return -EPIPE; 3753 } 3754 } else { 3755 p = list_first_entry(&tsk->publications, struct publication, 3756 binding_sock); 3757 } 3758 3759 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3760 err = __tipc_nl_add_sk_publ(skb, cb, p); 3761 if (err) { 3762 *last_publ = p->key; 3763 return err; 3764 } 3765 } 3766 *last_publ = 0; 3767 3768 return 0; 3769 } 3770 3771 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3772 { 3773 int err; 3774 u32 tsk_portid = cb->args[0]; 3775 u32 last_publ = cb->args[1]; 3776 u32 done = cb->args[2]; 3777 struct net *net = sock_net(skb->sk); 3778 struct tipc_sock *tsk; 3779 3780 if (!tsk_portid) { 3781 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3782 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3783 3784 if (!attrs[TIPC_NLA_SOCK]) 3785 return -EINVAL; 3786 3787 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3788 attrs[TIPC_NLA_SOCK], 3789 tipc_nl_sock_policy, NULL); 3790 if (err) 3791 return err; 3792 3793 if (!sock[TIPC_NLA_SOCK_REF]) 3794 return -EINVAL; 3795 3796 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3797 } 3798 3799 if (done) 3800 return 0; 3801 3802 tsk = tipc_sk_lookup(net, tsk_portid); 3803 if (!tsk) 3804 return -EINVAL; 3805 3806 lock_sock(&tsk->sk); 3807 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3808 if (!err) 3809 done = 1; 3810 release_sock(&tsk->sk); 3811 sock_put(&tsk->sk); 3812 3813 cb->args[0] = tsk_portid; 3814 cb->args[1] = last_publ; 3815 cb->args[2] = done; 3816 3817 return skb->len; 3818 } 3819 3820 /** 3821 * tipc_sk_filtering - check if a socket should be traced 3822 * @sk: the socket to be examined 3823 * 3824 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering: 3825 * (portid, sock type, name type, name lower, name upper) 3826 * 3827 * Return: true if the socket meets the socket tuple data 3828 * (value 0 = 'any') or when there is no tuple set (all = 0), 3829 * otherwise false 3830 */ 3831 bool tipc_sk_filtering(struct sock *sk) 3832 { 3833 struct tipc_sock *tsk; 3834 struct publication *p; 3835 u32 _port, _sktype, _type, _lower, _upper; 3836 u32 type = 0, lower = 0, upper = 0; 3837 3838 if (!sk) 3839 return true; 3840 3841 tsk = tipc_sk(sk); 3842 3843 _port = sysctl_tipc_sk_filter[0]; 3844 _sktype = sysctl_tipc_sk_filter[1]; 3845 _type = sysctl_tipc_sk_filter[2]; 3846 _lower = sysctl_tipc_sk_filter[3]; 3847 _upper = sysctl_tipc_sk_filter[4]; 3848 3849 if (!_port && !_sktype && !_type && !_lower && !_upper) 3850 return true; 3851 3852 if (_port) 3853 return (_port == tsk->portid); 3854 3855 if (_sktype && _sktype != sk->sk_type) 3856 return false; 3857 3858 if (tsk->published) { 3859 p = list_first_entry_or_null(&tsk->publications, 3860 struct publication, binding_sock); 3861 if (p) { 3862 type = p->sr.type; 3863 lower = p->sr.lower; 3864 upper = p->sr.upper; 3865 } 3866 } 3867 3868 if (!tipc_sk_type_connectionless(sk)) { 3869 type = tsk->conn_type; 3870 lower = tsk->conn_instance; 3871 upper = tsk->conn_instance; 3872 } 3873 3874 if ((_type && _type != type) || (_lower && _lower != lower) || 3875 (_upper && _upper != upper)) 3876 return false; 3877 3878 return true; 3879 } 3880 3881 u32 tipc_sock_get_portid(struct sock *sk) 3882 { 3883 return (sk) ? (tipc_sk(sk))->portid : 0; 3884 } 3885 3886 /** 3887 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3888 * both the rcv and backlog queues are considered 3889 * @sk: tipc sk to be checked 3890 * @skb: tipc msg to be checked 3891 * 3892 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3893 */ 3894 3895 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3896 { 3897 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3898 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3899 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3900 3901 return (qsize > lim * 90 / 100); 3902 } 3903 3904 /** 3905 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3906 * only the rcv queue is considered 3907 * @sk: tipc sk to be checked 3908 * @skb: tipc msg to be checked 3909 * 3910 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3911 */ 3912 3913 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3914 { 3915 unsigned int lim = rcvbuf_limit(sk, skb); 3916 unsigned int qsize = sk_rmem_alloc_get(sk); 3917 3918 return (qsize > lim * 90 / 100); 3919 } 3920 3921 /** 3922 * tipc_sk_dump - dump TIPC socket 3923 * @sk: tipc sk to be dumped 3924 * @dqueues: bitmask to decide if any socket queue to be dumped? 3925 * - TIPC_DUMP_NONE: don't dump socket queues 3926 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3927 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3928 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3929 * - TIPC_DUMP_ALL: dump all the socket queues above 3930 * @buf: returned buffer of dump data in format 3931 */ 3932 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3933 { 3934 int i = 0; 3935 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3936 struct tipc_sock *tsk; 3937 struct publication *p; 3938 bool tsk_connected; 3939 3940 if (!sk) { 3941 i += scnprintf(buf, sz, "sk data: (null)\n"); 3942 return i; 3943 } 3944 3945 tsk = tipc_sk(sk); 3946 tsk_connected = !tipc_sk_type_connectionless(sk); 3947 3948 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3949 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3950 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3951 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3952 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3953 if (tsk_connected) { 3954 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3955 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3956 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type); 3957 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance); 3958 } 3959 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3960 if (tsk->published) { 3961 p = list_first_entry_or_null(&tsk->publications, 3962 struct publication, binding_sock); 3963 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0); 3964 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0); 3965 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0); 3966 } 3967 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3968 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3969 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3970 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3971 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3972 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3973 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3974 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3975 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3976 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3977 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3978 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3979 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3980 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3981 3982 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3983 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3984 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3985 } 3986 3987 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3988 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3989 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3990 } 3991 3992 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 3993 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 3994 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 3995 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 3996 i += scnprintf(buf + i, sz - i, " tail "); 3997 i += tipc_skb_dump(sk->sk_backlog.tail, false, 3998 buf + i); 3999 } 4000 } 4001 4002 return i; 4003 } 4004