1 /* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2007, 2012-2019, Ericsson AB 5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems 6 * Copyright (c) 2020-2021, Red Hat Inc 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the names of the copyright holders nor the names of its 18 * contributors may be used to endorse or promote products derived from 19 * this software without specific prior written permission. 20 * 21 * Alternatively, this software may be distributed under the terms of the 22 * GNU General Public License ("GPL") version 2 as published by the Free 23 * Software Foundation. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/rhashtable.h> 39 #include <linux/sched/signal.h> 40 41 #include "core.h" 42 #include "name_table.h" 43 #include "node.h" 44 #include "link.h" 45 #include "name_distr.h" 46 #include "socket.h" 47 #include "bcast.h" 48 #include "netlink.h" 49 #include "group.h" 50 #include "trace.h" 51 52 #define NAGLE_START_INIT 4 53 #define NAGLE_START_MAX 1024 54 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 55 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 56 #define TIPC_MAX_PORT 0xffffffff 57 #define TIPC_MIN_PORT 1 58 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */ 59 60 enum { 61 TIPC_LISTEN = TCP_LISTEN, 62 TIPC_ESTABLISHED = TCP_ESTABLISHED, 63 TIPC_OPEN = TCP_CLOSE, 64 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 65 TIPC_CONNECTING = TCP_SYN_SENT, 66 }; 67 68 struct sockaddr_pair { 69 struct sockaddr_tipc sock; 70 struct sockaddr_tipc member; 71 }; 72 73 /** 74 * struct tipc_sock - TIPC socket structure 75 * @sk: socket - interacts with 'port' and with user via the socket API 76 * @max_pkt: maximum packet size "hint" used when building messages sent by port 77 * @maxnagle: maximum size of msg which can be subject to nagle 78 * @portid: unique port identity in TIPC socket hash table 79 * @phdr: preformatted message header used when sending messages 80 * @cong_links: list of congested links 81 * @publications: list of publications for port 82 * @blocking_link: address of the congested link we are currently sleeping on 83 * @pub_count: total # of publications port has made during its lifetime 84 * @conn_timeout: the time we can wait for an unresponded setup request 85 * @probe_unacked: probe has not received ack yet 86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 87 * @cong_link_cnt: number of congested links 88 * @snt_unacked: # messages sent by socket, and not yet acked by peer 89 * @snd_win: send window size 90 * @peer_caps: peer capabilities mask 91 * @rcv_unacked: # messages read by user, but not yet acked back to peer 92 * @rcv_win: receive window size 93 * @peer: 'connected' peer for dgram/rdm 94 * @node: hash table node 95 * @mc_method: cookie for use between socket and broadcast layer 96 * @rcu: rcu struct for tipc_sock 97 * @group: TIPC communications group 98 * @oneway: message count in one direction (FIXME) 99 * @nagle_start: current nagle value 100 * @snd_backlog: send backlog count 101 * @msg_acc: messages accepted; used in managing backlog and nagle 102 * @pkt_cnt: TIPC socket packet count 103 * @expect_ack: whether this TIPC socket is expecting an ack 104 * @nodelay: setsockopt() TIPC_NODELAY setting 105 * @group_is_open: TIPC socket group is fully open (FIXME) 106 * @published: true if port has one or more associated names 107 * @conn_addrtype: address type used when establishing connection 108 */ 109 struct tipc_sock { 110 struct sock sk; 111 u32 max_pkt; 112 u32 maxnagle; 113 u32 portid; 114 struct tipc_msg phdr; 115 struct list_head cong_links; 116 struct list_head publications; 117 u32 pub_count; 118 atomic_t dupl_rcvcnt; 119 u16 conn_timeout; 120 bool probe_unacked; 121 u16 cong_link_cnt; 122 u16 snt_unacked; 123 u16 snd_win; 124 u16 peer_caps; 125 u16 rcv_unacked; 126 u16 rcv_win; 127 struct sockaddr_tipc peer; 128 struct rhash_head node; 129 struct tipc_mc_method mc_method; 130 struct rcu_head rcu; 131 struct tipc_group *group; 132 u32 oneway; 133 u32 nagle_start; 134 u16 snd_backlog; 135 u16 msg_acc; 136 u16 pkt_cnt; 137 bool expect_ack; 138 bool nodelay; 139 bool group_is_open; 140 bool published; 141 u8 conn_addrtype; 142 }; 143 144 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 145 static void tipc_data_ready(struct sock *sk); 146 static void tipc_write_space(struct sock *sk); 147 static void tipc_sock_destruct(struct sock *sk); 148 static int tipc_release(struct socket *sock); 149 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 150 bool kern); 151 static void tipc_sk_timeout(struct timer_list *t); 152 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua); 153 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua); 154 static int tipc_sk_leave(struct tipc_sock *tsk); 155 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 156 static int tipc_sk_insert(struct tipc_sock *tsk); 157 static void tipc_sk_remove(struct tipc_sock *tsk); 158 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 159 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 160 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 161 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p); 162 163 static const struct proto_ops packet_ops; 164 static const struct proto_ops stream_ops; 165 static const struct proto_ops msg_ops; 166 static struct proto tipc_proto; 167 static const struct rhashtable_params tsk_rht_params; 168 169 static u32 tsk_own_node(struct tipc_sock *tsk) 170 { 171 return msg_prevnode(&tsk->phdr); 172 } 173 174 static u32 tsk_peer_node(struct tipc_sock *tsk) 175 { 176 return msg_destnode(&tsk->phdr); 177 } 178 179 static u32 tsk_peer_port(struct tipc_sock *tsk) 180 { 181 return msg_destport(&tsk->phdr); 182 } 183 184 static bool tsk_unreliable(struct tipc_sock *tsk) 185 { 186 return msg_src_droppable(&tsk->phdr) != 0; 187 } 188 189 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 190 { 191 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 192 } 193 194 static bool tsk_unreturnable(struct tipc_sock *tsk) 195 { 196 return msg_dest_droppable(&tsk->phdr) != 0; 197 } 198 199 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 200 { 201 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 202 } 203 204 static int tsk_importance(struct tipc_sock *tsk) 205 { 206 return msg_importance(&tsk->phdr); 207 } 208 209 static struct tipc_sock *tipc_sk(const struct sock *sk) 210 { 211 return container_of(sk, struct tipc_sock, sk); 212 } 213 214 int tsk_set_importance(struct sock *sk, int imp) 215 { 216 if (imp > TIPC_CRITICAL_IMPORTANCE) 217 return -EINVAL; 218 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 219 return 0; 220 } 221 222 static bool tsk_conn_cong(struct tipc_sock *tsk) 223 { 224 return tsk->snt_unacked > tsk->snd_win; 225 } 226 227 static u16 tsk_blocks(int len) 228 { 229 return ((len / FLOWCTL_BLK_SZ) + 1); 230 } 231 232 /* tsk_blocks(): translate a buffer size in bytes to number of 233 * advertisable blocks, taking into account the ratio truesize(len)/len 234 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 235 */ 236 static u16 tsk_adv_blocks(int len) 237 { 238 return len / FLOWCTL_BLK_SZ / 4; 239 } 240 241 /* tsk_inc(): increment counter for sent or received data 242 * - If block based flow control is not supported by peer we 243 * fall back to message based ditto, incrementing the counter 244 */ 245 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 246 { 247 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 248 return ((msglen / FLOWCTL_BLK_SZ) + 1); 249 return 1; 250 } 251 252 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 253 */ 254 static void tsk_set_nagle(struct tipc_sock *tsk) 255 { 256 struct sock *sk = &tsk->sk; 257 258 tsk->maxnagle = 0; 259 if (sk->sk_type != SOCK_STREAM) 260 return; 261 if (tsk->nodelay) 262 return; 263 if (!(tsk->peer_caps & TIPC_NAGLE)) 264 return; 265 /* Limit node local buffer size to avoid receive queue overflow */ 266 if (tsk->max_pkt == MAX_MSG_SIZE) 267 tsk->maxnagle = 1500; 268 else 269 tsk->maxnagle = tsk->max_pkt; 270 } 271 272 /** 273 * tsk_advance_rx_queue - discard first buffer in socket receive queue 274 * @sk: network socket 275 * 276 * Caller must hold socket lock 277 */ 278 static void tsk_advance_rx_queue(struct sock *sk) 279 { 280 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 281 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 282 } 283 284 /* tipc_sk_respond() : send response message back to sender 285 */ 286 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 287 { 288 u32 selector; 289 u32 dnode; 290 u32 onode = tipc_own_addr(sock_net(sk)); 291 292 if (!tipc_msg_reverse(onode, &skb, err)) 293 return; 294 295 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 296 dnode = msg_destnode(buf_msg(skb)); 297 selector = msg_origport(buf_msg(skb)); 298 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 299 } 300 301 /** 302 * tsk_rej_rx_queue - reject all buffers in socket receive queue 303 * @sk: network socket 304 * @error: response error code 305 * 306 * Caller must hold socket lock 307 */ 308 static void tsk_rej_rx_queue(struct sock *sk, int error) 309 { 310 struct sk_buff *skb; 311 312 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 313 tipc_sk_respond(sk, skb, error); 314 } 315 316 static bool tipc_sk_connected(struct sock *sk) 317 { 318 return sk->sk_state == TIPC_ESTABLISHED; 319 } 320 321 /* tipc_sk_type_connectionless - check if the socket is datagram socket 322 * @sk: socket 323 * 324 * Returns true if connection less, false otherwise 325 */ 326 static bool tipc_sk_type_connectionless(struct sock *sk) 327 { 328 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 329 } 330 331 /* tsk_peer_msg - verify if message was sent by connected port's peer 332 * 333 * Handles cases where the node's network address has changed from 334 * the default of <0.0.0> to its configured setting. 335 */ 336 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 337 { 338 struct sock *sk = &tsk->sk; 339 u32 self = tipc_own_addr(sock_net(sk)); 340 u32 peer_port = tsk_peer_port(tsk); 341 u32 orig_node, peer_node; 342 343 if (unlikely(!tipc_sk_connected(sk))) 344 return false; 345 346 if (unlikely(msg_origport(msg) != peer_port)) 347 return false; 348 349 orig_node = msg_orignode(msg); 350 peer_node = tsk_peer_node(tsk); 351 352 if (likely(orig_node == peer_node)) 353 return true; 354 355 if (!orig_node && peer_node == self) 356 return true; 357 358 if (!peer_node && orig_node == self) 359 return true; 360 361 return false; 362 } 363 364 /* tipc_set_sk_state - set the sk_state of the socket 365 * @sk: socket 366 * 367 * Caller must hold socket lock 368 * 369 * Returns 0 on success, errno otherwise 370 */ 371 static int tipc_set_sk_state(struct sock *sk, int state) 372 { 373 int oldsk_state = sk->sk_state; 374 int res = -EINVAL; 375 376 switch (state) { 377 case TIPC_OPEN: 378 res = 0; 379 break; 380 case TIPC_LISTEN: 381 case TIPC_CONNECTING: 382 if (oldsk_state == TIPC_OPEN) 383 res = 0; 384 break; 385 case TIPC_ESTABLISHED: 386 if (oldsk_state == TIPC_CONNECTING || 387 oldsk_state == TIPC_OPEN) 388 res = 0; 389 break; 390 case TIPC_DISCONNECTING: 391 if (oldsk_state == TIPC_CONNECTING || 392 oldsk_state == TIPC_ESTABLISHED) 393 res = 0; 394 break; 395 } 396 397 if (!res) 398 sk->sk_state = state; 399 400 return res; 401 } 402 403 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 404 { 405 struct sock *sk = sock->sk; 406 int err = sock_error(sk); 407 int typ = sock->type; 408 409 if (err) 410 return err; 411 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 412 if (sk->sk_state == TIPC_DISCONNECTING) 413 return -EPIPE; 414 else if (!tipc_sk_connected(sk)) 415 return -ENOTCONN; 416 } 417 if (!*timeout) 418 return -EAGAIN; 419 if (signal_pending(current)) 420 return sock_intr_errno(*timeout); 421 422 return 0; 423 } 424 425 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 426 ({ \ 427 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 428 struct sock *sk_; \ 429 int rc_; \ 430 \ 431 while ((rc_ = !(condition_))) { \ 432 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 433 smp_rmb(); \ 434 sk_ = (sock_)->sk; \ 435 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 436 if (rc_) \ 437 break; \ 438 add_wait_queue(sk_sleep(sk_), &wait_); \ 439 release_sock(sk_); \ 440 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 441 sched_annotate_sleep(); \ 442 lock_sock(sk_); \ 443 remove_wait_queue(sk_sleep(sk_), &wait_); \ 444 } \ 445 rc_; \ 446 }) 447 448 /** 449 * tipc_sk_create - create a TIPC socket 450 * @net: network namespace (must be default network) 451 * @sock: pre-allocated socket structure 452 * @protocol: protocol indicator (must be 0) 453 * @kern: caused by kernel or by userspace? 454 * 455 * This routine creates additional data structures used by the TIPC socket, 456 * initializes them, and links them together. 457 * 458 * Return: 0 on success, errno otherwise 459 */ 460 static int tipc_sk_create(struct net *net, struct socket *sock, 461 int protocol, int kern) 462 { 463 const struct proto_ops *ops; 464 struct sock *sk; 465 struct tipc_sock *tsk; 466 struct tipc_msg *msg; 467 468 /* Validate arguments */ 469 if (unlikely(protocol != 0)) 470 return -EPROTONOSUPPORT; 471 472 switch (sock->type) { 473 case SOCK_STREAM: 474 ops = &stream_ops; 475 break; 476 case SOCK_SEQPACKET: 477 ops = &packet_ops; 478 break; 479 case SOCK_DGRAM: 480 case SOCK_RDM: 481 ops = &msg_ops; 482 break; 483 default: 484 return -EPROTOTYPE; 485 } 486 487 /* Allocate socket's protocol area */ 488 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 489 if (sk == NULL) 490 return -ENOMEM; 491 492 tsk = tipc_sk(sk); 493 tsk->max_pkt = MAX_PKT_DEFAULT; 494 tsk->maxnagle = 0; 495 tsk->nagle_start = NAGLE_START_INIT; 496 INIT_LIST_HEAD(&tsk->publications); 497 INIT_LIST_HEAD(&tsk->cong_links); 498 msg = &tsk->phdr; 499 500 /* Finish initializing socket data structures */ 501 sock->ops = ops; 502 sock_init_data(sock, sk); 503 tipc_set_sk_state(sk, TIPC_OPEN); 504 if (tipc_sk_insert(tsk)) { 505 pr_warn("Socket create failed; port number exhausted\n"); 506 return -EINVAL; 507 } 508 509 /* Ensure tsk is visible before we read own_addr. */ 510 smp_mb(); 511 512 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 513 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 514 515 msg_set_origport(msg, tsk->portid); 516 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 517 sk->sk_shutdown = 0; 518 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 519 sk->sk_rcvbuf = sysctl_tipc_rmem[1]; 520 sk->sk_data_ready = tipc_data_ready; 521 sk->sk_write_space = tipc_write_space; 522 sk->sk_destruct = tipc_sock_destruct; 523 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 524 tsk->group_is_open = true; 525 atomic_set(&tsk->dupl_rcvcnt, 0); 526 527 /* Start out with safe limits until we receive an advertised window */ 528 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 529 tsk->rcv_win = tsk->snd_win; 530 531 if (tipc_sk_type_connectionless(sk)) { 532 tsk_set_unreturnable(tsk, true); 533 if (sock->type == SOCK_DGRAM) 534 tsk_set_unreliable(tsk, true); 535 } 536 __skb_queue_head_init(&tsk->mc_method.deferredq); 537 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 538 return 0; 539 } 540 541 static void tipc_sk_callback(struct rcu_head *head) 542 { 543 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 544 545 sock_put(&tsk->sk); 546 } 547 548 /* Caller should hold socket lock for the socket. */ 549 static void __tipc_shutdown(struct socket *sock, int error) 550 { 551 struct sock *sk = sock->sk; 552 struct tipc_sock *tsk = tipc_sk(sk); 553 struct net *net = sock_net(sk); 554 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 555 u32 dnode = tsk_peer_node(tsk); 556 struct sk_buff *skb; 557 558 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 559 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 560 !tsk_conn_cong(tsk))); 561 562 /* Push out delayed messages if in Nagle mode */ 563 tipc_sk_push_backlog(tsk, false); 564 /* Remove pending SYN */ 565 __skb_queue_purge(&sk->sk_write_queue); 566 567 /* Remove partially received buffer if any */ 568 skb = skb_peek(&sk->sk_receive_queue); 569 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 570 __skb_unlink(skb, &sk->sk_receive_queue); 571 kfree_skb(skb); 572 } 573 574 /* Reject all unreceived messages if connectionless */ 575 if (tipc_sk_type_connectionless(sk)) { 576 tsk_rej_rx_queue(sk, error); 577 return; 578 } 579 580 switch (sk->sk_state) { 581 case TIPC_CONNECTING: 582 case TIPC_ESTABLISHED: 583 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 584 tipc_node_remove_conn(net, dnode, tsk->portid); 585 /* Send a FIN+/- to its peer */ 586 skb = __skb_dequeue(&sk->sk_receive_queue); 587 if (skb) { 588 __skb_queue_purge(&sk->sk_receive_queue); 589 tipc_sk_respond(sk, skb, error); 590 break; 591 } 592 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 593 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 594 tsk_own_node(tsk), tsk_peer_port(tsk), 595 tsk->portid, error); 596 if (skb) 597 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 598 break; 599 case TIPC_LISTEN: 600 /* Reject all SYN messages */ 601 tsk_rej_rx_queue(sk, error); 602 break; 603 default: 604 __skb_queue_purge(&sk->sk_receive_queue); 605 break; 606 } 607 } 608 609 /** 610 * tipc_release - destroy a TIPC socket 611 * @sock: socket to destroy 612 * 613 * This routine cleans up any messages that are still queued on the socket. 614 * For DGRAM and RDM socket types, all queued messages are rejected. 615 * For SEQPACKET and STREAM socket types, the first message is rejected 616 * and any others are discarded. (If the first message on a STREAM socket 617 * is partially-read, it is discarded and the next one is rejected instead.) 618 * 619 * NOTE: Rejected messages are not necessarily returned to the sender! They 620 * are returned or discarded according to the "destination droppable" setting 621 * specified for the message by the sender. 622 * 623 * Return: 0 on success, errno otherwise 624 */ 625 static int tipc_release(struct socket *sock) 626 { 627 struct sock *sk = sock->sk; 628 struct tipc_sock *tsk; 629 630 /* 631 * Exit if socket isn't fully initialized (occurs when a failed accept() 632 * releases a pre-allocated child socket that was never used) 633 */ 634 if (sk == NULL) 635 return 0; 636 637 tsk = tipc_sk(sk); 638 lock_sock(sk); 639 640 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 641 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 642 sk->sk_shutdown = SHUTDOWN_MASK; 643 tipc_sk_leave(tsk); 644 tipc_sk_withdraw(tsk, NULL); 645 __skb_queue_purge(&tsk->mc_method.deferredq); 646 sk_stop_timer(sk, &sk->sk_timer); 647 tipc_sk_remove(tsk); 648 649 sock_orphan(sk); 650 /* Reject any messages that accumulated in backlog queue */ 651 release_sock(sk); 652 tipc_dest_list_purge(&tsk->cong_links); 653 tsk->cong_link_cnt = 0; 654 call_rcu(&tsk->rcu, tipc_sk_callback); 655 sock->sk = NULL; 656 657 return 0; 658 } 659 660 /** 661 * __tipc_bind - associate or disassocate TIPC name(s) with a socket 662 * @sock: socket structure 663 * @skaddr: socket address describing name(s) and desired operation 664 * @alen: size of socket address data structure 665 * 666 * Name and name sequence binding are indicated using a positive scope value; 667 * a negative scope value unbinds the specified name. Specifying no name 668 * (i.e. a socket address length of 0) unbinds all names from the socket. 669 * 670 * Return: 0 on success, errno otherwise 671 * 672 * NOTE: This routine doesn't need to take the socket lock since it doesn't 673 * access any non-constant socket information. 674 */ 675 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 676 { 677 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 678 struct tipc_sock *tsk = tipc_sk(sock->sk); 679 bool unbind = false; 680 681 if (unlikely(!alen)) 682 return tipc_sk_withdraw(tsk, NULL); 683 684 if (ua->addrtype == TIPC_SERVICE_ADDR) { 685 ua->addrtype = TIPC_SERVICE_RANGE; 686 ua->sr.upper = ua->sr.lower; 687 } 688 if (ua->scope < 0) { 689 unbind = true; 690 ua->scope = -ua->scope; 691 } 692 /* Users may still use deprecated TIPC_ZONE_SCOPE */ 693 if (ua->scope != TIPC_NODE_SCOPE) 694 ua->scope = TIPC_CLUSTER_SCOPE; 695 696 if (tsk->group) 697 return -EACCES; 698 699 if (unbind) 700 return tipc_sk_withdraw(tsk, ua); 701 return tipc_sk_publish(tsk, ua); 702 } 703 704 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 705 { 706 int res; 707 708 lock_sock(sock->sk); 709 res = __tipc_bind(sock, skaddr, alen); 710 release_sock(sock->sk); 711 return res; 712 } 713 714 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 715 { 716 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 717 u32 atype = ua->addrtype; 718 719 if (alen) { 720 if (!tipc_uaddr_valid(ua, alen)) 721 return -EINVAL; 722 if (atype == TIPC_SOCKET_ADDR) 723 return -EAFNOSUPPORT; 724 if (ua->sr.type < TIPC_RESERVED_TYPES) { 725 pr_warn_once("Can't bind to reserved service type %u\n", 726 ua->sr.type); 727 return -EACCES; 728 } 729 } 730 return tipc_sk_bind(sock, skaddr, alen); 731 } 732 733 /** 734 * tipc_getname - get port ID of socket or peer socket 735 * @sock: socket structure 736 * @uaddr: area for returned socket address 737 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 738 * 739 * Return: 0 on success, errno otherwise 740 * 741 * NOTE: This routine doesn't need to take the socket lock since it only 742 * accesses socket information that is unchanging (or which changes in 743 * a completely predictable manner). 744 */ 745 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 746 int peer) 747 { 748 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 749 struct sock *sk = sock->sk; 750 struct tipc_sock *tsk = tipc_sk(sk); 751 752 memset(addr, 0, sizeof(*addr)); 753 if (peer) { 754 if ((!tipc_sk_connected(sk)) && 755 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 756 return -ENOTCONN; 757 addr->addr.id.ref = tsk_peer_port(tsk); 758 addr->addr.id.node = tsk_peer_node(tsk); 759 } else { 760 addr->addr.id.ref = tsk->portid; 761 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 762 } 763 764 addr->addrtype = TIPC_SOCKET_ADDR; 765 addr->family = AF_TIPC; 766 addr->scope = 0; 767 addr->addr.name.domain = 0; 768 769 return sizeof(*addr); 770 } 771 772 /** 773 * tipc_poll - read and possibly block on pollmask 774 * @file: file structure associated with the socket 775 * @sock: socket for which to calculate the poll bits 776 * @wait: ??? 777 * 778 * Return: pollmask value 779 * 780 * COMMENTARY: 781 * It appears that the usual socket locking mechanisms are not useful here 782 * since the pollmask info is potentially out-of-date the moment this routine 783 * exits. TCP and other protocols seem to rely on higher level poll routines 784 * to handle any preventable race conditions, so TIPC will do the same ... 785 * 786 * IMPORTANT: The fact that a read or write operation is indicated does NOT 787 * imply that the operation will succeed, merely that it should be performed 788 * and will not block. 789 */ 790 static __poll_t tipc_poll(struct file *file, struct socket *sock, 791 poll_table *wait) 792 { 793 struct sock *sk = sock->sk; 794 struct tipc_sock *tsk = tipc_sk(sk); 795 __poll_t revents = 0; 796 797 sock_poll_wait(file, sock, wait); 798 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 799 800 if (sk->sk_shutdown & RCV_SHUTDOWN) 801 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 802 if (sk->sk_shutdown == SHUTDOWN_MASK) 803 revents |= EPOLLHUP; 804 805 switch (sk->sk_state) { 806 case TIPC_ESTABLISHED: 807 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 808 revents |= EPOLLOUT; 809 fallthrough; 810 case TIPC_LISTEN: 811 case TIPC_CONNECTING: 812 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 813 revents |= EPOLLIN | EPOLLRDNORM; 814 break; 815 case TIPC_OPEN: 816 if (tsk->group_is_open && !tsk->cong_link_cnt) 817 revents |= EPOLLOUT; 818 if (!tipc_sk_type_connectionless(sk)) 819 break; 820 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 821 break; 822 revents |= EPOLLIN | EPOLLRDNORM; 823 break; 824 case TIPC_DISCONNECTING: 825 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 826 break; 827 } 828 return revents; 829 } 830 831 /** 832 * tipc_sendmcast - send multicast message 833 * @sock: socket structure 834 * @ua: destination address struct 835 * @msg: message to send 836 * @dlen: length of data to send 837 * @timeout: timeout to wait for wakeup 838 * 839 * Called from function tipc_sendmsg(), which has done all sanity checks 840 * Return: the number of bytes sent on success, or errno 841 */ 842 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua, 843 struct msghdr *msg, size_t dlen, long timeout) 844 { 845 struct sock *sk = sock->sk; 846 struct tipc_sock *tsk = tipc_sk(sk); 847 struct tipc_msg *hdr = &tsk->phdr; 848 struct net *net = sock_net(sk); 849 int mtu = tipc_bcast_get_mtu(net); 850 struct sk_buff_head pkts; 851 struct tipc_nlist dsts; 852 int rc; 853 854 if (tsk->group) 855 return -EACCES; 856 857 /* Block or return if any destination link is congested */ 858 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 859 if (unlikely(rc)) 860 return rc; 861 862 /* Lookup destination nodes */ 863 tipc_nlist_init(&dsts, tipc_own_addr(net)); 864 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts); 865 if (!dsts.local && !dsts.remote) 866 return -EHOSTUNREACH; 867 868 /* Build message header */ 869 msg_set_type(hdr, TIPC_MCAST_MSG); 870 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 871 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 872 msg_set_destport(hdr, 0); 873 msg_set_destnode(hdr, 0); 874 msg_set_nametype(hdr, ua->sr.type); 875 msg_set_namelower(hdr, ua->sr.lower); 876 msg_set_nameupper(hdr, ua->sr.upper); 877 878 /* Build message as chain of buffers */ 879 __skb_queue_head_init(&pkts); 880 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 881 882 /* Send message if build was successful */ 883 if (unlikely(rc == dlen)) { 884 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 885 TIPC_DUMP_SK_SNDQ, " "); 886 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts, 887 &tsk->cong_link_cnt); 888 } 889 890 tipc_nlist_purge(&dsts); 891 892 return rc ? rc : dlen; 893 } 894 895 /** 896 * tipc_send_group_msg - send a message to a member in the group 897 * @net: network namespace 898 * @tsk: tipc socket 899 * @m: message to send 900 * @mb: group member 901 * @dnode: destination node 902 * @dport: destination port 903 * @dlen: total length of message data 904 */ 905 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 906 struct msghdr *m, struct tipc_member *mb, 907 u32 dnode, u32 dport, int dlen) 908 { 909 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 910 struct tipc_mc_method *method = &tsk->mc_method; 911 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 912 struct tipc_msg *hdr = &tsk->phdr; 913 struct sk_buff_head pkts; 914 int mtu, rc; 915 916 /* Complete message header */ 917 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 918 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 919 msg_set_destport(hdr, dport); 920 msg_set_destnode(hdr, dnode); 921 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 922 923 /* Build message as chain of buffers */ 924 __skb_queue_head_init(&pkts); 925 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 926 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 927 if (unlikely(rc != dlen)) 928 return rc; 929 930 /* Send message */ 931 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 932 if (unlikely(rc == -ELINKCONG)) { 933 tipc_dest_push(&tsk->cong_links, dnode, 0); 934 tsk->cong_link_cnt++; 935 } 936 937 /* Update send window */ 938 tipc_group_update_member(mb, blks); 939 940 /* A broadcast sent within next EXPIRE period must follow same path */ 941 method->rcast = true; 942 method->mandatory = true; 943 return dlen; 944 } 945 946 /** 947 * tipc_send_group_unicast - send message to a member in the group 948 * @sock: socket structure 949 * @m: message to send 950 * @dlen: total length of message data 951 * @timeout: timeout to wait for wakeup 952 * 953 * Called from function tipc_sendmsg(), which has done all sanity checks 954 * Return: the number of bytes sent on success, or errno 955 */ 956 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 957 int dlen, long timeout) 958 { 959 struct sock *sk = sock->sk; 960 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 961 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 962 struct tipc_sock *tsk = tipc_sk(sk); 963 struct net *net = sock_net(sk); 964 struct tipc_member *mb = NULL; 965 u32 node, port; 966 int rc; 967 968 node = ua->sk.node; 969 port = ua->sk.ref; 970 if (!port && !node) 971 return -EHOSTUNREACH; 972 973 /* Block or return if destination link or member is congested */ 974 rc = tipc_wait_for_cond(sock, &timeout, 975 !tipc_dest_find(&tsk->cong_links, node, 0) && 976 tsk->group && 977 !tipc_group_cong(tsk->group, node, port, blks, 978 &mb)); 979 if (unlikely(rc)) 980 return rc; 981 982 if (unlikely(!mb)) 983 return -EHOSTUNREACH; 984 985 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 986 987 return rc ? rc : dlen; 988 } 989 990 /** 991 * tipc_send_group_anycast - send message to any member with given identity 992 * @sock: socket structure 993 * @m: message to send 994 * @dlen: total length of message data 995 * @timeout: timeout to wait for wakeup 996 * 997 * Called from function tipc_sendmsg(), which has done all sanity checks 998 * Return: the number of bytes sent on success, or errno 999 */ 1000 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 1001 int dlen, long timeout) 1002 { 1003 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1004 struct sock *sk = sock->sk; 1005 struct tipc_sock *tsk = tipc_sk(sk); 1006 struct list_head *cong_links = &tsk->cong_links; 1007 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 1008 struct tipc_msg *hdr = &tsk->phdr; 1009 struct tipc_member *first = NULL; 1010 struct tipc_member *mbr = NULL; 1011 struct net *net = sock_net(sk); 1012 u32 node, port, exclude; 1013 struct list_head dsts; 1014 int lookups = 0; 1015 int dstcnt, rc; 1016 bool cong; 1017 1018 INIT_LIST_HEAD(&dsts); 1019 ua->sa.type = msg_nametype(hdr); 1020 ua->scope = msg_lookup_scope(hdr); 1021 1022 while (++lookups < 4) { 1023 exclude = tipc_group_exclude(tsk->group); 1024 1025 first = NULL; 1026 1027 /* Look for a non-congested destination member, if any */ 1028 while (1) { 1029 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, 1030 exclude, false)) 1031 return -EHOSTUNREACH; 1032 tipc_dest_pop(&dsts, &node, &port); 1033 cong = tipc_group_cong(tsk->group, node, port, blks, 1034 &mbr); 1035 if (!cong) 1036 break; 1037 if (mbr == first) 1038 break; 1039 if (!first) 1040 first = mbr; 1041 } 1042 1043 /* Start over if destination was not in member list */ 1044 if (unlikely(!mbr)) 1045 continue; 1046 1047 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1048 break; 1049 1050 /* Block or return if destination link or member is congested */ 1051 rc = tipc_wait_for_cond(sock, &timeout, 1052 !tipc_dest_find(cong_links, node, 0) && 1053 tsk->group && 1054 !tipc_group_cong(tsk->group, node, port, 1055 blks, &mbr)); 1056 if (unlikely(rc)) 1057 return rc; 1058 1059 /* Send, unless destination disappeared while waiting */ 1060 if (likely(mbr)) 1061 break; 1062 } 1063 1064 if (unlikely(lookups >= 4)) 1065 return -EHOSTUNREACH; 1066 1067 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1068 1069 return rc ? rc : dlen; 1070 } 1071 1072 /** 1073 * tipc_send_group_bcast - send message to all members in communication group 1074 * @sock: socket structure 1075 * @m: message to send 1076 * @dlen: total length of message data 1077 * @timeout: timeout to wait for wakeup 1078 * 1079 * Called from function tipc_sendmsg(), which has done all sanity checks 1080 * Return: the number of bytes sent on success, or errno 1081 */ 1082 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1083 int dlen, long timeout) 1084 { 1085 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1086 struct sock *sk = sock->sk; 1087 struct net *net = sock_net(sk); 1088 struct tipc_sock *tsk = tipc_sk(sk); 1089 struct tipc_nlist *dsts; 1090 struct tipc_mc_method *method = &tsk->mc_method; 1091 bool ack = method->mandatory && method->rcast; 1092 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1093 struct tipc_msg *hdr = &tsk->phdr; 1094 int mtu = tipc_bcast_get_mtu(net); 1095 struct sk_buff_head pkts; 1096 int rc = -EHOSTUNREACH; 1097 1098 /* Block or return if any destination link or member is congested */ 1099 rc = tipc_wait_for_cond(sock, &timeout, 1100 !tsk->cong_link_cnt && tsk->group && 1101 !tipc_group_bc_cong(tsk->group, blks)); 1102 if (unlikely(rc)) 1103 return rc; 1104 1105 dsts = tipc_group_dests(tsk->group); 1106 if (!dsts->local && !dsts->remote) 1107 return -EHOSTUNREACH; 1108 1109 /* Complete message header */ 1110 if (ua) { 1111 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1112 msg_set_nameinst(hdr, ua->sa.instance); 1113 } else { 1114 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1115 msg_set_nameinst(hdr, 0); 1116 } 1117 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1118 msg_set_destport(hdr, 0); 1119 msg_set_destnode(hdr, 0); 1120 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1121 1122 /* Avoid getting stuck with repeated forced replicasts */ 1123 msg_set_grp_bc_ack_req(hdr, ack); 1124 1125 /* Build message as chain of buffers */ 1126 __skb_queue_head_init(&pkts); 1127 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1128 if (unlikely(rc != dlen)) 1129 return rc; 1130 1131 /* Send message */ 1132 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1133 if (unlikely(rc)) 1134 return rc; 1135 1136 /* Update broadcast sequence number and send windows */ 1137 tipc_group_update_bc_members(tsk->group, blks, ack); 1138 1139 /* Broadcast link is now free to choose method for next broadcast */ 1140 method->mandatory = false; 1141 method->expires = jiffies; 1142 1143 return dlen; 1144 } 1145 1146 /** 1147 * tipc_send_group_mcast - send message to all members with given identity 1148 * @sock: socket structure 1149 * @m: message to send 1150 * @dlen: total length of message data 1151 * @timeout: timeout to wait for wakeup 1152 * 1153 * Called from function tipc_sendmsg(), which has done all sanity checks 1154 * Return: the number of bytes sent on success, or errno 1155 */ 1156 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1157 int dlen, long timeout) 1158 { 1159 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1160 struct sock *sk = sock->sk; 1161 struct tipc_sock *tsk = tipc_sk(sk); 1162 struct tipc_group *grp = tsk->group; 1163 struct tipc_msg *hdr = &tsk->phdr; 1164 struct net *net = sock_net(sk); 1165 struct list_head dsts; 1166 u32 dstcnt, exclude; 1167 1168 INIT_LIST_HEAD(&dsts); 1169 ua->sa.type = msg_nametype(hdr); 1170 ua->scope = msg_lookup_scope(hdr); 1171 exclude = tipc_group_exclude(grp); 1172 1173 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true)) 1174 return -EHOSTUNREACH; 1175 1176 if (dstcnt == 1) { 1177 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref); 1178 return tipc_send_group_unicast(sock, m, dlen, timeout); 1179 } 1180 1181 tipc_dest_list_purge(&dsts); 1182 return tipc_send_group_bcast(sock, m, dlen, timeout); 1183 } 1184 1185 /** 1186 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1187 * @net: the associated network namespace 1188 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1189 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1190 * 1191 * Multi-threaded: parallel calls with reference to same queues may occur 1192 */ 1193 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1194 struct sk_buff_head *inputq) 1195 { 1196 u32 self = tipc_own_addr(net); 1197 struct sk_buff *skb, *_skb; 1198 u32 portid, onode; 1199 struct sk_buff_head tmpq; 1200 struct list_head dports; 1201 struct tipc_msg *hdr; 1202 struct tipc_uaddr ua; 1203 int user, mtyp, hlen; 1204 1205 __skb_queue_head_init(&tmpq); 1206 INIT_LIST_HEAD(&dports); 1207 ua.addrtype = TIPC_SERVICE_RANGE; 1208 1209 /* tipc_skb_peek() increments the head skb's reference counter */ 1210 skb = tipc_skb_peek(arrvq, &inputq->lock); 1211 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1212 hdr = buf_msg(skb); 1213 user = msg_user(hdr); 1214 mtyp = msg_type(hdr); 1215 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1216 onode = msg_orignode(hdr); 1217 ua.sr.type = msg_nametype(hdr); 1218 ua.sr.lower = msg_namelower(hdr); 1219 ua.sr.upper = msg_nameupper(hdr); 1220 if (onode == self) 1221 ua.scope = TIPC_ANY_SCOPE; 1222 else 1223 ua.scope = TIPC_CLUSTER_SCOPE; 1224 1225 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1226 spin_lock_bh(&inputq->lock); 1227 if (skb_peek(arrvq) == skb) { 1228 __skb_dequeue(arrvq); 1229 __skb_queue_tail(inputq, skb); 1230 } 1231 kfree_skb(skb); 1232 spin_unlock_bh(&inputq->lock); 1233 continue; 1234 } 1235 1236 /* Group messages require exact scope match */ 1237 if (msg_in_group(hdr)) { 1238 ua.sr.lower = 0; 1239 ua.sr.upper = ~0; 1240 ua.scope = msg_lookup_scope(hdr); 1241 } 1242 1243 /* Create destination port list: */ 1244 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports); 1245 1246 /* Clone message per destination */ 1247 while (tipc_dest_pop(&dports, NULL, &portid)) { 1248 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1249 if (_skb) { 1250 msg_set_destport(buf_msg(_skb), portid); 1251 __skb_queue_tail(&tmpq, _skb); 1252 continue; 1253 } 1254 pr_warn("Failed to clone mcast rcv buffer\n"); 1255 } 1256 /* Append clones to inputq only if skb is still head of arrvq */ 1257 spin_lock_bh(&inputq->lock); 1258 if (skb_peek(arrvq) == skb) { 1259 skb_queue_splice_tail_init(&tmpq, inputq); 1260 /* Decrement the skb's refcnt */ 1261 kfree_skb(__skb_dequeue(arrvq)); 1262 } 1263 spin_unlock_bh(&inputq->lock); 1264 __skb_queue_purge(&tmpq); 1265 kfree_skb(skb); 1266 } 1267 tipc_sk_rcv(net, inputq); 1268 } 1269 1270 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1271 * when socket is in Nagle mode 1272 */ 1273 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1274 { 1275 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1276 struct sk_buff *skb = skb_peek_tail(txq); 1277 struct net *net = sock_net(&tsk->sk); 1278 u32 dnode = tsk_peer_node(tsk); 1279 int rc; 1280 1281 if (nagle_ack) { 1282 tsk->pkt_cnt += skb_queue_len(txq); 1283 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1284 tsk->oneway = 0; 1285 if (tsk->nagle_start < NAGLE_START_MAX) 1286 tsk->nagle_start *= 2; 1287 tsk->expect_ack = false; 1288 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1289 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1290 tsk->nagle_start); 1291 } else { 1292 tsk->nagle_start = NAGLE_START_INIT; 1293 if (skb) { 1294 msg_set_ack_required(buf_msg(skb)); 1295 tsk->expect_ack = true; 1296 } else { 1297 tsk->expect_ack = false; 1298 } 1299 } 1300 tsk->msg_acc = 0; 1301 tsk->pkt_cnt = 0; 1302 } 1303 1304 if (!skb || tsk->cong_link_cnt) 1305 return; 1306 1307 /* Do not send SYN again after congestion */ 1308 if (msg_is_syn(buf_msg(skb))) 1309 return; 1310 1311 if (tsk->msg_acc) 1312 tsk->pkt_cnt += skb_queue_len(txq); 1313 tsk->snt_unacked += tsk->snd_backlog; 1314 tsk->snd_backlog = 0; 1315 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1316 if (rc == -ELINKCONG) 1317 tsk->cong_link_cnt = 1; 1318 } 1319 1320 /** 1321 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1322 * @tsk: receiving socket 1323 * @skb: pointer to message buffer. 1324 * @inputq: buffer list containing the buffers 1325 * @xmitq: output message area 1326 */ 1327 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1328 struct sk_buff_head *inputq, 1329 struct sk_buff_head *xmitq) 1330 { 1331 struct tipc_msg *hdr = buf_msg(skb); 1332 u32 onode = tsk_own_node(tsk); 1333 struct sock *sk = &tsk->sk; 1334 int mtyp = msg_type(hdr); 1335 bool was_cong; 1336 1337 /* Ignore if connection cannot be validated: */ 1338 if (!tsk_peer_msg(tsk, hdr)) { 1339 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1340 goto exit; 1341 } 1342 1343 if (unlikely(msg_errcode(hdr))) { 1344 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1345 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1346 tsk_peer_port(tsk)); 1347 sk->sk_state_change(sk); 1348 1349 /* State change is ignored if socket already awake, 1350 * - convert msg to abort msg and add to inqueue 1351 */ 1352 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1353 msg_set_type(hdr, TIPC_CONN_MSG); 1354 msg_set_size(hdr, BASIC_H_SIZE); 1355 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1356 __skb_queue_tail(inputq, skb); 1357 return; 1358 } 1359 1360 tsk->probe_unacked = false; 1361 1362 if (mtyp == CONN_PROBE) { 1363 msg_set_type(hdr, CONN_PROBE_REPLY); 1364 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1365 __skb_queue_tail(xmitq, skb); 1366 return; 1367 } else if (mtyp == CONN_ACK) { 1368 was_cong = tsk_conn_cong(tsk); 1369 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1370 tsk->snt_unacked -= msg_conn_ack(hdr); 1371 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1372 tsk->snd_win = msg_adv_win(hdr); 1373 if (was_cong && !tsk_conn_cong(tsk)) 1374 sk->sk_write_space(sk); 1375 } else if (mtyp != CONN_PROBE_REPLY) { 1376 pr_warn("Received unknown CONN_PROTO msg\n"); 1377 } 1378 exit: 1379 kfree_skb(skb); 1380 } 1381 1382 /** 1383 * tipc_sendmsg - send message in connectionless manner 1384 * @sock: socket structure 1385 * @m: message to send 1386 * @dsz: amount of user data to be sent 1387 * 1388 * Message must have an destination specified explicitly. 1389 * Used for SOCK_RDM and SOCK_DGRAM messages, 1390 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1391 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1392 * 1393 * Return: the number of bytes sent on success, or errno otherwise 1394 */ 1395 static int tipc_sendmsg(struct socket *sock, 1396 struct msghdr *m, size_t dsz) 1397 { 1398 struct sock *sk = sock->sk; 1399 int ret; 1400 1401 lock_sock(sk); 1402 ret = __tipc_sendmsg(sock, m, dsz); 1403 release_sock(sk); 1404 1405 return ret; 1406 } 1407 1408 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1409 { 1410 struct sock *sk = sock->sk; 1411 struct net *net = sock_net(sk); 1412 struct tipc_sock *tsk = tipc_sk(sk); 1413 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1414 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1415 struct list_head *clinks = &tsk->cong_links; 1416 bool syn = !tipc_sk_type_connectionless(sk); 1417 struct tipc_group *grp = tsk->group; 1418 struct tipc_msg *hdr = &tsk->phdr; 1419 struct tipc_socket_addr skaddr; 1420 struct sk_buff_head pkts; 1421 int atype, mtu, rc; 1422 1423 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1424 return -EMSGSIZE; 1425 1426 if (ua) { 1427 if (!tipc_uaddr_valid(ua, m->msg_namelen)) 1428 return -EINVAL; 1429 atype = ua->addrtype; 1430 } 1431 1432 /* If socket belongs to a communication group follow other paths */ 1433 if (grp) { 1434 if (!ua) 1435 return tipc_send_group_bcast(sock, m, dlen, timeout); 1436 if (atype == TIPC_SERVICE_ADDR) 1437 return tipc_send_group_anycast(sock, m, dlen, timeout); 1438 if (atype == TIPC_SOCKET_ADDR) 1439 return tipc_send_group_unicast(sock, m, dlen, timeout); 1440 if (atype == TIPC_SERVICE_RANGE) 1441 return tipc_send_group_mcast(sock, m, dlen, timeout); 1442 return -EINVAL; 1443 } 1444 1445 if (!ua) { 1446 ua = (struct tipc_uaddr *)&tsk->peer; 1447 if (!syn && ua->family != AF_TIPC) 1448 return -EDESTADDRREQ; 1449 atype = ua->addrtype; 1450 } 1451 1452 if (unlikely(syn)) { 1453 if (sk->sk_state == TIPC_LISTEN) 1454 return -EPIPE; 1455 if (sk->sk_state != TIPC_OPEN) 1456 return -EISCONN; 1457 if (tsk->published) 1458 return -EOPNOTSUPP; 1459 if (atype == TIPC_SERVICE_ADDR) 1460 tsk->conn_addrtype = atype; 1461 msg_set_syn(hdr, 1); 1462 } 1463 1464 /* Determine destination */ 1465 if (atype == TIPC_SERVICE_RANGE) { 1466 return tipc_sendmcast(sock, ua, m, dlen, timeout); 1467 } else if (atype == TIPC_SERVICE_ADDR) { 1468 skaddr.node = ua->lookup_node; 1469 ua->scope = tipc_node2scope(skaddr.node); 1470 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr)) 1471 return -EHOSTUNREACH; 1472 } else if (atype == TIPC_SOCKET_ADDR) { 1473 skaddr = ua->sk; 1474 } else { 1475 return -EINVAL; 1476 } 1477 1478 /* Block or return if destination link is congested */ 1479 rc = tipc_wait_for_cond(sock, &timeout, 1480 !tipc_dest_find(clinks, skaddr.node, 0)); 1481 if (unlikely(rc)) 1482 return rc; 1483 1484 /* Finally build message header */ 1485 msg_set_destnode(hdr, skaddr.node); 1486 msg_set_destport(hdr, skaddr.ref); 1487 if (atype == TIPC_SERVICE_ADDR) { 1488 msg_set_type(hdr, TIPC_NAMED_MSG); 1489 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1490 msg_set_nametype(hdr, ua->sa.type); 1491 msg_set_nameinst(hdr, ua->sa.instance); 1492 msg_set_lookup_scope(hdr, ua->scope); 1493 } else { /* TIPC_SOCKET_ADDR */ 1494 msg_set_type(hdr, TIPC_DIRECT_MSG); 1495 msg_set_lookup_scope(hdr, 0); 1496 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1497 } 1498 1499 /* Add message body */ 1500 __skb_queue_head_init(&pkts); 1501 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true); 1502 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1503 if (unlikely(rc != dlen)) 1504 return rc; 1505 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1506 __skb_queue_purge(&pkts); 1507 return -ENOMEM; 1508 } 1509 1510 /* Send message */ 1511 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1512 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid); 1513 if (unlikely(rc == -ELINKCONG)) { 1514 tipc_dest_push(clinks, skaddr.node, 0); 1515 tsk->cong_link_cnt++; 1516 rc = 0; 1517 } 1518 1519 if (unlikely(syn && !rc)) { 1520 tipc_set_sk_state(sk, TIPC_CONNECTING); 1521 if (dlen && timeout) { 1522 timeout = msecs_to_jiffies(timeout); 1523 tipc_wait_for_connect(sock, &timeout); 1524 } 1525 } 1526 1527 return rc ? rc : dlen; 1528 } 1529 1530 /** 1531 * tipc_sendstream - send stream-oriented data 1532 * @sock: socket structure 1533 * @m: data to send 1534 * @dsz: total length of data to be transmitted 1535 * 1536 * Used for SOCK_STREAM data. 1537 * 1538 * Return: the number of bytes sent on success (or partial success), 1539 * or errno if no data sent 1540 */ 1541 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1542 { 1543 struct sock *sk = sock->sk; 1544 int ret; 1545 1546 lock_sock(sk); 1547 ret = __tipc_sendstream(sock, m, dsz); 1548 release_sock(sk); 1549 1550 return ret; 1551 } 1552 1553 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1554 { 1555 struct sock *sk = sock->sk; 1556 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1557 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1558 struct sk_buff_head *txq = &sk->sk_write_queue; 1559 struct tipc_sock *tsk = tipc_sk(sk); 1560 struct tipc_msg *hdr = &tsk->phdr; 1561 struct net *net = sock_net(sk); 1562 struct sk_buff *skb; 1563 u32 dnode = tsk_peer_node(tsk); 1564 int maxnagle = tsk->maxnagle; 1565 int maxpkt = tsk->max_pkt; 1566 int send, sent = 0; 1567 int blocks, rc = 0; 1568 1569 if (unlikely(dlen > INT_MAX)) 1570 return -EMSGSIZE; 1571 1572 /* Handle implicit connection setup */ 1573 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) { 1574 rc = __tipc_sendmsg(sock, m, dlen); 1575 if (dlen && dlen == rc) { 1576 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1577 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1578 } 1579 return rc; 1580 } 1581 1582 do { 1583 rc = tipc_wait_for_cond(sock, &timeout, 1584 (!tsk->cong_link_cnt && 1585 !tsk_conn_cong(tsk) && 1586 tipc_sk_connected(sk))); 1587 if (unlikely(rc)) 1588 break; 1589 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1590 blocks = tsk->snd_backlog; 1591 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1592 send <= maxnagle) { 1593 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1594 if (unlikely(rc < 0)) 1595 break; 1596 blocks += rc; 1597 tsk->msg_acc++; 1598 if (blocks <= 64 && tsk->expect_ack) { 1599 tsk->snd_backlog = blocks; 1600 sent += send; 1601 break; 1602 } else if (blocks > 64) { 1603 tsk->pkt_cnt += skb_queue_len(txq); 1604 } else { 1605 skb = skb_peek_tail(txq); 1606 if (skb) { 1607 msg_set_ack_required(buf_msg(skb)); 1608 tsk->expect_ack = true; 1609 } else { 1610 tsk->expect_ack = false; 1611 } 1612 tsk->msg_acc = 0; 1613 tsk->pkt_cnt = 0; 1614 } 1615 } else { 1616 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1617 if (unlikely(rc != send)) 1618 break; 1619 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1620 } 1621 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1622 TIPC_DUMP_SK_SNDQ, " "); 1623 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1624 if (unlikely(rc == -ELINKCONG)) { 1625 tsk->cong_link_cnt = 1; 1626 rc = 0; 1627 } 1628 if (likely(!rc)) { 1629 tsk->snt_unacked += blocks; 1630 tsk->snd_backlog = 0; 1631 sent += send; 1632 } 1633 } while (sent < dlen && !rc); 1634 1635 return sent ? sent : rc; 1636 } 1637 1638 /** 1639 * tipc_send_packet - send a connection-oriented message 1640 * @sock: socket structure 1641 * @m: message to send 1642 * @dsz: length of data to be transmitted 1643 * 1644 * Used for SOCK_SEQPACKET messages. 1645 * 1646 * Return: the number of bytes sent on success, or errno otherwise 1647 */ 1648 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1649 { 1650 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1651 return -EMSGSIZE; 1652 1653 return tipc_sendstream(sock, m, dsz); 1654 } 1655 1656 /* tipc_sk_finish_conn - complete the setup of a connection 1657 */ 1658 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1659 u32 peer_node) 1660 { 1661 struct sock *sk = &tsk->sk; 1662 struct net *net = sock_net(sk); 1663 struct tipc_msg *msg = &tsk->phdr; 1664 1665 msg_set_syn(msg, 0); 1666 msg_set_destnode(msg, peer_node); 1667 msg_set_destport(msg, peer_port); 1668 msg_set_type(msg, TIPC_CONN_MSG); 1669 msg_set_lookup_scope(msg, 0); 1670 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1671 1672 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1673 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1674 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1675 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1676 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1677 tsk_set_nagle(tsk); 1678 __skb_queue_purge(&sk->sk_write_queue); 1679 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1680 return; 1681 1682 /* Fall back to message based flow control */ 1683 tsk->rcv_win = FLOWCTL_MSG_WIN; 1684 tsk->snd_win = FLOWCTL_MSG_WIN; 1685 } 1686 1687 /** 1688 * tipc_sk_set_orig_addr - capture sender's address for received message 1689 * @m: descriptor for message info 1690 * @skb: received message 1691 * 1692 * Note: Address is not captured if not requested by receiver. 1693 */ 1694 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1695 { 1696 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1697 struct tipc_msg *hdr = buf_msg(skb); 1698 1699 if (!srcaddr) 1700 return; 1701 1702 srcaddr->sock.family = AF_TIPC; 1703 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR; 1704 srcaddr->sock.scope = 0; 1705 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1706 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1707 srcaddr->sock.addr.name.domain = 0; 1708 m->msg_namelen = sizeof(struct sockaddr_tipc); 1709 1710 if (!msg_in_group(hdr)) 1711 return; 1712 1713 /* Group message users may also want to know sending member's id */ 1714 srcaddr->member.family = AF_TIPC; 1715 srcaddr->member.addrtype = TIPC_SERVICE_ADDR; 1716 srcaddr->member.scope = 0; 1717 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1718 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1719 srcaddr->member.addr.name.domain = 0; 1720 m->msg_namelen = sizeof(*srcaddr); 1721 } 1722 1723 /** 1724 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1725 * @m: descriptor for message info 1726 * @skb: received message buffer 1727 * @tsk: TIPC port associated with message 1728 * 1729 * Note: Ancillary data is not captured if not requested by receiver. 1730 * 1731 * Return: 0 if successful, otherwise errno 1732 */ 1733 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1734 struct tipc_sock *tsk) 1735 { 1736 struct tipc_msg *hdr; 1737 u32 data[3] = {0,}; 1738 bool has_addr; 1739 int dlen, rc; 1740 1741 if (likely(m->msg_controllen == 0)) 1742 return 0; 1743 1744 hdr = buf_msg(skb); 1745 dlen = msg_data_sz(hdr); 1746 1747 /* Capture errored message object, if any */ 1748 if (msg_errcode(hdr)) { 1749 if (skb_linearize(skb)) 1750 return -ENOMEM; 1751 hdr = buf_msg(skb); 1752 data[0] = msg_errcode(hdr); 1753 data[1] = dlen; 1754 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data); 1755 if (rc || !dlen) 1756 return rc; 1757 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr)); 1758 if (rc) 1759 return rc; 1760 } 1761 1762 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */ 1763 switch (msg_type(hdr)) { 1764 case TIPC_NAMED_MSG: 1765 has_addr = true; 1766 data[0] = msg_nametype(hdr); 1767 data[1] = msg_namelower(hdr); 1768 data[2] = data[1]; 1769 break; 1770 case TIPC_MCAST_MSG: 1771 has_addr = true; 1772 data[0] = msg_nametype(hdr); 1773 data[1] = msg_namelower(hdr); 1774 data[2] = msg_nameupper(hdr); 1775 break; 1776 case TIPC_CONN_MSG: 1777 has_addr = !!tsk->conn_addrtype; 1778 data[0] = msg_nametype(&tsk->phdr); 1779 data[1] = msg_nameinst(&tsk->phdr); 1780 data[2] = data[1]; 1781 break; 1782 default: 1783 has_addr = false; 1784 } 1785 if (!has_addr) 1786 return 0; 1787 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data); 1788 } 1789 1790 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1791 { 1792 struct sock *sk = &tsk->sk; 1793 struct sk_buff *skb = NULL; 1794 struct tipc_msg *msg; 1795 u32 peer_port = tsk_peer_port(tsk); 1796 u32 dnode = tsk_peer_node(tsk); 1797 1798 if (!tipc_sk_connected(sk)) 1799 return NULL; 1800 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1801 dnode, tsk_own_node(tsk), peer_port, 1802 tsk->portid, TIPC_OK); 1803 if (!skb) 1804 return NULL; 1805 msg = buf_msg(skb); 1806 msg_set_conn_ack(msg, tsk->rcv_unacked); 1807 tsk->rcv_unacked = 0; 1808 1809 /* Adjust to and advertize the correct window limit */ 1810 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1811 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1812 msg_set_adv_win(msg, tsk->rcv_win); 1813 } 1814 return skb; 1815 } 1816 1817 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1818 { 1819 struct sk_buff *skb; 1820 1821 skb = tipc_sk_build_ack(tsk); 1822 if (!skb) 1823 return; 1824 1825 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1826 msg_link_selector(buf_msg(skb))); 1827 } 1828 1829 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1830 { 1831 struct sock *sk = sock->sk; 1832 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1833 long timeo = *timeop; 1834 int err = sock_error(sk); 1835 1836 if (err) 1837 return err; 1838 1839 for (;;) { 1840 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1841 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1842 err = -ENOTCONN; 1843 break; 1844 } 1845 add_wait_queue(sk_sleep(sk), &wait); 1846 release_sock(sk); 1847 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1848 sched_annotate_sleep(); 1849 lock_sock(sk); 1850 remove_wait_queue(sk_sleep(sk), &wait); 1851 } 1852 err = 0; 1853 if (!skb_queue_empty(&sk->sk_receive_queue)) 1854 break; 1855 err = -EAGAIN; 1856 if (!timeo) 1857 break; 1858 err = sock_intr_errno(timeo); 1859 if (signal_pending(current)) 1860 break; 1861 1862 err = sock_error(sk); 1863 if (err) 1864 break; 1865 } 1866 *timeop = timeo; 1867 return err; 1868 } 1869 1870 /** 1871 * tipc_recvmsg - receive packet-oriented message 1872 * @sock: network socket 1873 * @m: descriptor for message info 1874 * @buflen: length of user buffer area 1875 * @flags: receive flags 1876 * 1877 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1878 * If the complete message doesn't fit in user area, truncate it. 1879 * 1880 * Return: size of returned message data, errno otherwise 1881 */ 1882 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1883 size_t buflen, int flags) 1884 { 1885 struct sock *sk = sock->sk; 1886 bool connected = !tipc_sk_type_connectionless(sk); 1887 struct tipc_sock *tsk = tipc_sk(sk); 1888 int rc, err, hlen, dlen, copy; 1889 struct tipc_skb_cb *skb_cb; 1890 struct sk_buff_head xmitq; 1891 struct tipc_msg *hdr; 1892 struct sk_buff *skb; 1893 bool grp_evt; 1894 long timeout; 1895 1896 /* Catch invalid receive requests */ 1897 if (unlikely(!buflen)) 1898 return -EINVAL; 1899 1900 lock_sock(sk); 1901 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1902 rc = -ENOTCONN; 1903 goto exit; 1904 } 1905 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1906 1907 /* Step rcv queue to first msg with data or error; wait if necessary */ 1908 do { 1909 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1910 if (unlikely(rc)) 1911 goto exit; 1912 skb = skb_peek(&sk->sk_receive_queue); 1913 skb_cb = TIPC_SKB_CB(skb); 1914 hdr = buf_msg(skb); 1915 dlen = msg_data_sz(hdr); 1916 hlen = msg_hdr_sz(hdr); 1917 err = msg_errcode(hdr); 1918 grp_evt = msg_is_grp_evt(hdr); 1919 if (likely(dlen || err)) 1920 break; 1921 tsk_advance_rx_queue(sk); 1922 } while (1); 1923 1924 /* Collect msg meta data, including error code and rejected data */ 1925 tipc_sk_set_orig_addr(m, skb); 1926 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1927 if (unlikely(rc)) 1928 goto exit; 1929 hdr = buf_msg(skb); 1930 1931 /* Capture data if non-error msg, otherwise just set return value */ 1932 if (likely(!err)) { 1933 int offset = skb_cb->bytes_read; 1934 1935 copy = min_t(int, dlen - offset, buflen); 1936 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 1937 if (unlikely(rc)) 1938 goto exit; 1939 if (unlikely(offset + copy < dlen)) { 1940 if (flags & MSG_EOR) { 1941 if (!(flags & MSG_PEEK)) 1942 skb_cb->bytes_read = offset + copy; 1943 } else { 1944 m->msg_flags |= MSG_TRUNC; 1945 skb_cb->bytes_read = 0; 1946 } 1947 } else { 1948 if (flags & MSG_EOR) 1949 m->msg_flags |= MSG_EOR; 1950 skb_cb->bytes_read = 0; 1951 } 1952 } else { 1953 copy = 0; 1954 rc = 0; 1955 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) { 1956 rc = -ECONNRESET; 1957 goto exit; 1958 } 1959 } 1960 1961 /* Mark message as group event if applicable */ 1962 if (unlikely(grp_evt)) { 1963 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1964 m->msg_flags |= MSG_EOR; 1965 m->msg_flags |= MSG_OOB; 1966 copy = 0; 1967 } 1968 1969 /* Caption of data or error code/rejected data was successful */ 1970 if (unlikely(flags & MSG_PEEK)) 1971 goto exit; 1972 1973 /* Send group flow control advertisement when applicable */ 1974 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1975 __skb_queue_head_init(&xmitq); 1976 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1977 msg_orignode(hdr), msg_origport(hdr), 1978 &xmitq); 1979 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1980 } 1981 1982 if (skb_cb->bytes_read) 1983 goto exit; 1984 1985 tsk_advance_rx_queue(sk); 1986 1987 if (likely(!connected)) 1988 goto exit; 1989 1990 /* Send connection flow control advertisement when applicable */ 1991 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1992 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1993 tipc_sk_send_ack(tsk); 1994 exit: 1995 release_sock(sk); 1996 return rc ? rc : copy; 1997 } 1998 1999 /** 2000 * tipc_recvstream - receive stream-oriented data 2001 * @sock: network socket 2002 * @m: descriptor for message info 2003 * @buflen: total size of user buffer area 2004 * @flags: receive flags 2005 * 2006 * Used for SOCK_STREAM messages only. If not enough data is available 2007 * will optionally wait for more; never truncates data. 2008 * 2009 * Return: size of returned message data, errno otherwise 2010 */ 2011 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 2012 size_t buflen, int flags) 2013 { 2014 struct sock *sk = sock->sk; 2015 struct tipc_sock *tsk = tipc_sk(sk); 2016 struct sk_buff *skb; 2017 struct tipc_msg *hdr; 2018 struct tipc_skb_cb *skb_cb; 2019 bool peek = flags & MSG_PEEK; 2020 int offset, required, copy, copied = 0; 2021 int hlen, dlen, err, rc; 2022 long timeout; 2023 2024 /* Catch invalid receive attempts */ 2025 if (unlikely(!buflen)) 2026 return -EINVAL; 2027 2028 lock_sock(sk); 2029 2030 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2031 rc = -ENOTCONN; 2032 goto exit; 2033 } 2034 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2035 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2036 2037 do { 2038 /* Look at first msg in receive queue; wait if necessary */ 2039 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2040 if (unlikely(rc)) 2041 break; 2042 skb = skb_peek(&sk->sk_receive_queue); 2043 skb_cb = TIPC_SKB_CB(skb); 2044 hdr = buf_msg(skb); 2045 dlen = msg_data_sz(hdr); 2046 hlen = msg_hdr_sz(hdr); 2047 err = msg_errcode(hdr); 2048 2049 /* Discard any empty non-errored (SYN-) message */ 2050 if (unlikely(!dlen && !err)) { 2051 tsk_advance_rx_queue(sk); 2052 continue; 2053 } 2054 2055 /* Collect msg meta data, incl. error code and rejected data */ 2056 if (!copied) { 2057 tipc_sk_set_orig_addr(m, skb); 2058 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2059 if (rc) 2060 break; 2061 hdr = buf_msg(skb); 2062 } 2063 2064 /* Copy data if msg ok, otherwise return error/partial data */ 2065 if (likely(!err)) { 2066 offset = skb_cb->bytes_read; 2067 copy = min_t(int, dlen - offset, buflen - copied); 2068 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2069 if (unlikely(rc)) 2070 break; 2071 copied += copy; 2072 offset += copy; 2073 if (unlikely(offset < dlen)) { 2074 if (!peek) 2075 skb_cb->bytes_read = offset; 2076 break; 2077 } 2078 } else { 2079 rc = 0; 2080 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2081 rc = -ECONNRESET; 2082 if (copied || rc) 2083 break; 2084 } 2085 2086 if (unlikely(peek)) 2087 break; 2088 2089 tsk_advance_rx_queue(sk); 2090 2091 /* Send connection flow control advertisement when applicable */ 2092 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2093 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2094 tipc_sk_send_ack(tsk); 2095 2096 /* Exit if all requested data or FIN/error received */ 2097 if (copied == buflen || err) 2098 break; 2099 2100 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2101 exit: 2102 release_sock(sk); 2103 return copied ? copied : rc; 2104 } 2105 2106 /** 2107 * tipc_write_space - wake up thread if port congestion is released 2108 * @sk: socket 2109 */ 2110 static void tipc_write_space(struct sock *sk) 2111 { 2112 struct socket_wq *wq; 2113 2114 rcu_read_lock(); 2115 wq = rcu_dereference(sk->sk_wq); 2116 if (skwq_has_sleeper(wq)) 2117 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2118 EPOLLWRNORM | EPOLLWRBAND); 2119 rcu_read_unlock(); 2120 } 2121 2122 /** 2123 * tipc_data_ready - wake up threads to indicate messages have been received 2124 * @sk: socket 2125 */ 2126 static void tipc_data_ready(struct sock *sk) 2127 { 2128 struct socket_wq *wq; 2129 2130 rcu_read_lock(); 2131 wq = rcu_dereference(sk->sk_wq); 2132 if (skwq_has_sleeper(wq)) 2133 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2134 EPOLLRDNORM | EPOLLRDBAND); 2135 rcu_read_unlock(); 2136 } 2137 2138 static void tipc_sock_destruct(struct sock *sk) 2139 { 2140 __skb_queue_purge(&sk->sk_receive_queue); 2141 } 2142 2143 static void tipc_sk_proto_rcv(struct sock *sk, 2144 struct sk_buff_head *inputq, 2145 struct sk_buff_head *xmitq) 2146 { 2147 struct sk_buff *skb = __skb_dequeue(inputq); 2148 struct tipc_sock *tsk = tipc_sk(sk); 2149 struct tipc_msg *hdr = buf_msg(skb); 2150 struct tipc_group *grp = tsk->group; 2151 bool wakeup = false; 2152 2153 switch (msg_user(hdr)) { 2154 case CONN_MANAGER: 2155 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2156 return; 2157 case SOCK_WAKEUP: 2158 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2159 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2160 smp_wmb(); 2161 tsk->cong_link_cnt--; 2162 wakeup = true; 2163 tipc_sk_push_backlog(tsk, false); 2164 break; 2165 case GROUP_PROTOCOL: 2166 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2167 break; 2168 case TOP_SRV: 2169 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2170 hdr, inputq, xmitq); 2171 break; 2172 default: 2173 break; 2174 } 2175 2176 if (wakeup) 2177 sk->sk_write_space(sk); 2178 2179 kfree_skb(skb); 2180 } 2181 2182 /** 2183 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2184 * @tsk: TIPC socket 2185 * @skb: pointer to message buffer. 2186 * @xmitq: for Nagle ACK if any 2187 * Return: true if message should be added to receive queue, false otherwise 2188 */ 2189 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2190 struct sk_buff_head *xmitq) 2191 { 2192 struct sock *sk = &tsk->sk; 2193 struct net *net = sock_net(sk); 2194 struct tipc_msg *hdr = buf_msg(skb); 2195 bool con_msg = msg_connected(hdr); 2196 u32 pport = tsk_peer_port(tsk); 2197 u32 pnode = tsk_peer_node(tsk); 2198 u32 oport = msg_origport(hdr); 2199 u32 onode = msg_orignode(hdr); 2200 int err = msg_errcode(hdr); 2201 unsigned long delay; 2202 2203 if (unlikely(msg_mcast(hdr))) 2204 return false; 2205 tsk->oneway = 0; 2206 2207 switch (sk->sk_state) { 2208 case TIPC_CONNECTING: 2209 /* Setup ACK */ 2210 if (likely(con_msg)) { 2211 if (err) 2212 break; 2213 tipc_sk_finish_conn(tsk, oport, onode); 2214 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2215 /* ACK+ message with data is added to receive queue */ 2216 if (msg_data_sz(hdr)) 2217 return true; 2218 /* Empty ACK-, - wake up sleeping connect() and drop */ 2219 sk->sk_state_change(sk); 2220 msg_set_dest_droppable(hdr, 1); 2221 return false; 2222 } 2223 /* Ignore connectionless message if not from listening socket */ 2224 if (oport != pport || onode != pnode) 2225 return false; 2226 2227 /* Rejected SYN */ 2228 if (err != TIPC_ERR_OVERLOAD) 2229 break; 2230 2231 /* Prepare for new setup attempt if we have a SYN clone */ 2232 if (skb_queue_empty(&sk->sk_write_queue)) 2233 break; 2234 get_random_bytes(&delay, 2); 2235 delay %= (tsk->conn_timeout / 4); 2236 delay = msecs_to_jiffies(delay + 100); 2237 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2238 return false; 2239 case TIPC_OPEN: 2240 case TIPC_DISCONNECTING: 2241 return false; 2242 case TIPC_LISTEN: 2243 /* Accept only SYN message */ 2244 if (!msg_is_syn(hdr) && 2245 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2246 return false; 2247 if (!con_msg && !err) 2248 return true; 2249 return false; 2250 case TIPC_ESTABLISHED: 2251 if (!skb_queue_empty(&sk->sk_write_queue)) 2252 tipc_sk_push_backlog(tsk, false); 2253 /* Accept only connection-based messages sent by peer */ 2254 if (likely(con_msg && !err && pport == oport && 2255 pnode == onode)) { 2256 if (msg_ack_required(hdr)) { 2257 struct sk_buff *skb; 2258 2259 skb = tipc_sk_build_ack(tsk); 2260 if (skb) { 2261 msg_set_nagle_ack(buf_msg(skb)); 2262 __skb_queue_tail(xmitq, skb); 2263 } 2264 } 2265 return true; 2266 } 2267 if (!tsk_peer_msg(tsk, hdr)) 2268 return false; 2269 if (!err) 2270 return true; 2271 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2272 tipc_node_remove_conn(net, pnode, tsk->portid); 2273 sk->sk_state_change(sk); 2274 return true; 2275 default: 2276 pr_err("Unknown sk_state %u\n", sk->sk_state); 2277 } 2278 /* Abort connection setup attempt */ 2279 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2280 sk->sk_err = ECONNREFUSED; 2281 sk->sk_state_change(sk); 2282 return true; 2283 } 2284 2285 /** 2286 * rcvbuf_limit - get proper overload limit of socket receive queue 2287 * @sk: socket 2288 * @skb: message 2289 * 2290 * For connection oriented messages, irrespective of importance, 2291 * default queue limit is 2 MB. 2292 * 2293 * For connectionless messages, queue limits are based on message 2294 * importance as follows: 2295 * 2296 * TIPC_LOW_IMPORTANCE (2 MB) 2297 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2298 * TIPC_HIGH_IMPORTANCE (8 MB) 2299 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2300 * 2301 * Return: overload limit according to corresponding message importance 2302 */ 2303 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2304 { 2305 struct tipc_sock *tsk = tipc_sk(sk); 2306 struct tipc_msg *hdr = buf_msg(skb); 2307 2308 if (unlikely(msg_in_group(hdr))) 2309 return READ_ONCE(sk->sk_rcvbuf); 2310 2311 if (unlikely(!msg_connected(hdr))) 2312 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2313 2314 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2315 return READ_ONCE(sk->sk_rcvbuf); 2316 2317 return FLOWCTL_MSG_LIM; 2318 } 2319 2320 /** 2321 * tipc_sk_filter_rcv - validate incoming message 2322 * @sk: socket 2323 * @skb: pointer to message. 2324 * @xmitq: output message area (FIXME) 2325 * 2326 * Enqueues message on receive queue if acceptable; optionally handles 2327 * disconnect indication for a connected socket. 2328 * 2329 * Called with socket lock already taken 2330 */ 2331 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2332 struct sk_buff_head *xmitq) 2333 { 2334 bool sk_conn = !tipc_sk_type_connectionless(sk); 2335 struct tipc_sock *tsk = tipc_sk(sk); 2336 struct tipc_group *grp = tsk->group; 2337 struct tipc_msg *hdr = buf_msg(skb); 2338 struct net *net = sock_net(sk); 2339 struct sk_buff_head inputq; 2340 int mtyp = msg_type(hdr); 2341 int limit, err = TIPC_OK; 2342 2343 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2344 TIPC_SKB_CB(skb)->bytes_read = 0; 2345 __skb_queue_head_init(&inputq); 2346 __skb_queue_tail(&inputq, skb); 2347 2348 if (unlikely(!msg_isdata(hdr))) 2349 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2350 2351 if (unlikely(grp)) 2352 tipc_group_filter_msg(grp, &inputq, xmitq); 2353 2354 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2355 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2356 2357 /* Validate and add to receive buffer if there is space */ 2358 while ((skb = __skb_dequeue(&inputq))) { 2359 hdr = buf_msg(skb); 2360 limit = rcvbuf_limit(sk, skb); 2361 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2362 (!sk_conn && msg_connected(hdr)) || 2363 (!grp && msg_in_group(hdr))) 2364 err = TIPC_ERR_NO_PORT; 2365 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2366 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2367 "err_overload2!"); 2368 atomic_inc(&sk->sk_drops); 2369 err = TIPC_ERR_OVERLOAD; 2370 } 2371 2372 if (unlikely(err)) { 2373 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2374 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2375 "@filter_rcv!"); 2376 __skb_queue_tail(xmitq, skb); 2377 } 2378 err = TIPC_OK; 2379 continue; 2380 } 2381 __skb_queue_tail(&sk->sk_receive_queue, skb); 2382 skb_set_owner_r(skb, sk); 2383 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2384 "rcvq >90% allocated!"); 2385 sk->sk_data_ready(sk); 2386 } 2387 } 2388 2389 /** 2390 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2391 * @sk: socket 2392 * @skb: message 2393 * 2394 * Caller must hold socket lock 2395 */ 2396 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2397 { 2398 unsigned int before = sk_rmem_alloc_get(sk); 2399 struct sk_buff_head xmitq; 2400 unsigned int added; 2401 2402 __skb_queue_head_init(&xmitq); 2403 2404 tipc_sk_filter_rcv(sk, skb, &xmitq); 2405 added = sk_rmem_alloc_get(sk) - before; 2406 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2407 2408 /* Send pending response/rejected messages, if any */ 2409 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2410 return 0; 2411 } 2412 2413 /** 2414 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2415 * inputq and try adding them to socket or backlog queue 2416 * @inputq: list of incoming buffers with potentially different destinations 2417 * @sk: socket where the buffers should be enqueued 2418 * @dport: port number for the socket 2419 * @xmitq: output queue 2420 * 2421 * Caller must hold socket lock 2422 */ 2423 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2424 u32 dport, struct sk_buff_head *xmitq) 2425 { 2426 unsigned long time_limit = jiffies + usecs_to_jiffies(20000); 2427 struct sk_buff *skb; 2428 unsigned int lim; 2429 atomic_t *dcnt; 2430 u32 onode; 2431 2432 while (skb_queue_len(inputq)) { 2433 if (unlikely(time_after_eq(jiffies, time_limit))) 2434 return; 2435 2436 skb = tipc_skb_dequeue(inputq, dport); 2437 if (unlikely(!skb)) 2438 return; 2439 2440 /* Add message directly to receive queue if possible */ 2441 if (!sock_owned_by_user(sk)) { 2442 tipc_sk_filter_rcv(sk, skb, xmitq); 2443 continue; 2444 } 2445 2446 /* Try backlog, compensating for double-counted bytes */ 2447 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2448 if (!sk->sk_backlog.len) 2449 atomic_set(dcnt, 0); 2450 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2451 if (likely(!sk_add_backlog(sk, skb, lim))) { 2452 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2453 "bklg & rcvq >90% allocated!"); 2454 continue; 2455 } 2456 2457 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2458 /* Overload => reject message back to sender */ 2459 onode = tipc_own_addr(sock_net(sk)); 2460 atomic_inc(&sk->sk_drops); 2461 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2462 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2463 "@sk_enqueue!"); 2464 __skb_queue_tail(xmitq, skb); 2465 } 2466 break; 2467 } 2468 } 2469 2470 /** 2471 * tipc_sk_rcv - handle a chain of incoming buffers 2472 * @net: the associated network namespace 2473 * @inputq: buffer list containing the buffers 2474 * Consumes all buffers in list until inputq is empty 2475 * Note: may be called in multiple threads referring to the same queue 2476 */ 2477 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2478 { 2479 struct sk_buff_head xmitq; 2480 u32 dnode, dport = 0; 2481 int err; 2482 struct tipc_sock *tsk; 2483 struct sock *sk; 2484 struct sk_buff *skb; 2485 2486 __skb_queue_head_init(&xmitq); 2487 while (skb_queue_len(inputq)) { 2488 dport = tipc_skb_peek_port(inputq, dport); 2489 tsk = tipc_sk_lookup(net, dport); 2490 2491 if (likely(tsk)) { 2492 sk = &tsk->sk; 2493 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2494 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2495 spin_unlock_bh(&sk->sk_lock.slock); 2496 } 2497 /* Send pending response/rejected messages, if any */ 2498 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2499 sock_put(sk); 2500 continue; 2501 } 2502 /* No destination socket => dequeue skb if still there */ 2503 skb = tipc_skb_dequeue(inputq, dport); 2504 if (!skb) 2505 return; 2506 2507 /* Try secondary lookup if unresolved named message */ 2508 err = TIPC_ERR_NO_PORT; 2509 if (tipc_msg_lookup_dest(net, skb, &err)) 2510 goto xmit; 2511 2512 /* Prepare for message rejection */ 2513 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2514 continue; 2515 2516 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2517 xmit: 2518 dnode = msg_destnode(buf_msg(skb)); 2519 tipc_node_xmit_skb(net, skb, dnode, dport); 2520 } 2521 } 2522 2523 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2524 { 2525 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2526 struct sock *sk = sock->sk; 2527 int done; 2528 2529 do { 2530 int err = sock_error(sk); 2531 if (err) 2532 return err; 2533 if (!*timeo_p) 2534 return -ETIMEDOUT; 2535 if (signal_pending(current)) 2536 return sock_intr_errno(*timeo_p); 2537 if (sk->sk_state == TIPC_DISCONNECTING) 2538 break; 2539 2540 add_wait_queue(sk_sleep(sk), &wait); 2541 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2542 &wait); 2543 remove_wait_queue(sk_sleep(sk), &wait); 2544 } while (!done); 2545 return 0; 2546 } 2547 2548 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2549 { 2550 if (addr->family != AF_TIPC) 2551 return false; 2552 if (addr->addrtype == TIPC_SERVICE_RANGE) 2553 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2554 return (addr->addrtype == TIPC_SERVICE_ADDR || 2555 addr->addrtype == TIPC_SOCKET_ADDR); 2556 } 2557 2558 /** 2559 * tipc_connect - establish a connection to another TIPC port 2560 * @sock: socket structure 2561 * @dest: socket address for destination port 2562 * @destlen: size of socket address data structure 2563 * @flags: file-related flags associated with socket 2564 * 2565 * Return: 0 on success, errno otherwise 2566 */ 2567 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2568 int destlen, int flags) 2569 { 2570 struct sock *sk = sock->sk; 2571 struct tipc_sock *tsk = tipc_sk(sk); 2572 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2573 struct msghdr m = {NULL,}; 2574 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2575 int previous; 2576 int res = 0; 2577 2578 if (destlen != sizeof(struct sockaddr_tipc)) 2579 return -EINVAL; 2580 2581 lock_sock(sk); 2582 2583 if (tsk->group) { 2584 res = -EINVAL; 2585 goto exit; 2586 } 2587 2588 if (dst->family == AF_UNSPEC) { 2589 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2590 if (!tipc_sk_type_connectionless(sk)) 2591 res = -EINVAL; 2592 goto exit; 2593 } 2594 if (!tipc_sockaddr_is_sane(dst)) { 2595 res = -EINVAL; 2596 goto exit; 2597 } 2598 /* DGRAM/RDM connect(), just save the destaddr */ 2599 if (tipc_sk_type_connectionless(sk)) { 2600 memcpy(&tsk->peer, dest, destlen); 2601 goto exit; 2602 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2603 res = -EINVAL; 2604 goto exit; 2605 } 2606 2607 previous = sk->sk_state; 2608 2609 switch (sk->sk_state) { 2610 case TIPC_OPEN: 2611 /* Send a 'SYN-' to destination */ 2612 m.msg_name = dest; 2613 m.msg_namelen = destlen; 2614 2615 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2616 * indicate send_msg() is never blocked. 2617 */ 2618 if (!timeout) 2619 m.msg_flags = MSG_DONTWAIT; 2620 2621 res = __tipc_sendmsg(sock, &m, 0); 2622 if ((res < 0) && (res != -EWOULDBLOCK)) 2623 goto exit; 2624 2625 /* Just entered TIPC_CONNECTING state; the only 2626 * difference is that return value in non-blocking 2627 * case is EINPROGRESS, rather than EALREADY. 2628 */ 2629 res = -EINPROGRESS; 2630 fallthrough; 2631 case TIPC_CONNECTING: 2632 if (!timeout) { 2633 if (previous == TIPC_CONNECTING) 2634 res = -EALREADY; 2635 goto exit; 2636 } 2637 timeout = msecs_to_jiffies(timeout); 2638 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2639 res = tipc_wait_for_connect(sock, &timeout); 2640 break; 2641 case TIPC_ESTABLISHED: 2642 res = -EISCONN; 2643 break; 2644 default: 2645 res = -EINVAL; 2646 } 2647 2648 exit: 2649 release_sock(sk); 2650 return res; 2651 } 2652 2653 /** 2654 * tipc_listen - allow socket to listen for incoming connections 2655 * @sock: socket structure 2656 * @len: (unused) 2657 * 2658 * Return: 0 on success, errno otherwise 2659 */ 2660 static int tipc_listen(struct socket *sock, int len) 2661 { 2662 struct sock *sk = sock->sk; 2663 int res; 2664 2665 lock_sock(sk); 2666 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2667 release_sock(sk); 2668 2669 return res; 2670 } 2671 2672 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2673 { 2674 struct sock *sk = sock->sk; 2675 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2676 int err; 2677 2678 /* True wake-one mechanism for incoming connections: only 2679 * one process gets woken up, not the 'whole herd'. 2680 * Since we do not 'race & poll' for established sockets 2681 * anymore, the common case will execute the loop only once. 2682 */ 2683 for (;;) { 2684 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2685 add_wait_queue(sk_sleep(sk), &wait); 2686 release_sock(sk); 2687 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 2688 lock_sock(sk); 2689 remove_wait_queue(sk_sleep(sk), &wait); 2690 } 2691 err = 0; 2692 if (!skb_queue_empty(&sk->sk_receive_queue)) 2693 break; 2694 err = -EAGAIN; 2695 if (!timeo) 2696 break; 2697 err = sock_intr_errno(timeo); 2698 if (signal_pending(current)) 2699 break; 2700 } 2701 return err; 2702 } 2703 2704 /** 2705 * tipc_accept - wait for connection request 2706 * @sock: listening socket 2707 * @new_sock: new socket that is to be connected 2708 * @flags: file-related flags associated with socket 2709 * @kern: caused by kernel or by userspace? 2710 * 2711 * Return: 0 on success, errno otherwise 2712 */ 2713 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2714 bool kern) 2715 { 2716 struct sock *new_sk, *sk = sock->sk; 2717 struct tipc_sock *new_tsock; 2718 struct msghdr m = {NULL,}; 2719 struct tipc_msg *msg; 2720 struct sk_buff *buf; 2721 long timeo; 2722 int res; 2723 2724 lock_sock(sk); 2725 2726 if (sk->sk_state != TIPC_LISTEN) { 2727 res = -EINVAL; 2728 goto exit; 2729 } 2730 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2731 res = tipc_wait_for_accept(sock, timeo); 2732 if (res) 2733 goto exit; 2734 2735 buf = skb_peek(&sk->sk_receive_queue); 2736 2737 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2738 if (res) 2739 goto exit; 2740 security_sk_clone(sock->sk, new_sock->sk); 2741 2742 new_sk = new_sock->sk; 2743 new_tsock = tipc_sk(new_sk); 2744 msg = buf_msg(buf); 2745 2746 /* we lock on new_sk; but lockdep sees the lock on sk */ 2747 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2748 2749 /* 2750 * Reject any stray messages received by new socket 2751 * before the socket lock was taken (very, very unlikely) 2752 */ 2753 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2754 2755 /* Connect new socket to it's peer */ 2756 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2757 2758 tsk_set_importance(new_sk, msg_importance(msg)); 2759 if (msg_named(msg)) { 2760 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR; 2761 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg)); 2762 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg)); 2763 } 2764 2765 /* 2766 * Respond to 'SYN-' by discarding it & returning 'ACK'. 2767 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'. 2768 */ 2769 if (!msg_data_sz(msg)) { 2770 tsk_advance_rx_queue(sk); 2771 } else { 2772 __skb_dequeue(&sk->sk_receive_queue); 2773 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2774 skb_set_owner_r(buf, new_sk); 2775 } 2776 __tipc_sendstream(new_sock, &m, 0); 2777 release_sock(new_sk); 2778 exit: 2779 release_sock(sk); 2780 return res; 2781 } 2782 2783 /** 2784 * tipc_shutdown - shutdown socket connection 2785 * @sock: socket structure 2786 * @how: direction to close (must be SHUT_RDWR) 2787 * 2788 * Terminates connection (if necessary), then purges socket's receive queue. 2789 * 2790 * Return: 0 on success, errno otherwise 2791 */ 2792 static int tipc_shutdown(struct socket *sock, int how) 2793 { 2794 struct sock *sk = sock->sk; 2795 int res; 2796 2797 if (how != SHUT_RDWR) 2798 return -EINVAL; 2799 2800 lock_sock(sk); 2801 2802 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2803 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2804 sk->sk_shutdown = SHUTDOWN_MASK; 2805 2806 if (sk->sk_state == TIPC_DISCONNECTING) { 2807 /* Discard any unreceived messages */ 2808 __skb_queue_purge(&sk->sk_receive_queue); 2809 2810 res = 0; 2811 } else { 2812 res = -ENOTCONN; 2813 } 2814 /* Wake up anyone sleeping in poll. */ 2815 sk->sk_state_change(sk); 2816 2817 release_sock(sk); 2818 return res; 2819 } 2820 2821 static void tipc_sk_check_probing_state(struct sock *sk, 2822 struct sk_buff_head *list) 2823 { 2824 struct tipc_sock *tsk = tipc_sk(sk); 2825 u32 pnode = tsk_peer_node(tsk); 2826 u32 pport = tsk_peer_port(tsk); 2827 u32 self = tsk_own_node(tsk); 2828 u32 oport = tsk->portid; 2829 struct sk_buff *skb; 2830 2831 if (tsk->probe_unacked) { 2832 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2833 sk->sk_err = ECONNABORTED; 2834 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2835 sk->sk_state_change(sk); 2836 return; 2837 } 2838 /* Prepare new probe */ 2839 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2840 pnode, self, pport, oport, TIPC_OK); 2841 if (skb) 2842 __skb_queue_tail(list, skb); 2843 tsk->probe_unacked = true; 2844 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2845 } 2846 2847 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2848 { 2849 struct tipc_sock *tsk = tipc_sk(sk); 2850 2851 /* Try again later if dest link is congested */ 2852 if (tsk->cong_link_cnt) { 2853 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100)); 2854 return; 2855 } 2856 /* Prepare SYN for retransmit */ 2857 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2858 } 2859 2860 static void tipc_sk_timeout(struct timer_list *t) 2861 { 2862 struct sock *sk = from_timer(sk, t, sk_timer); 2863 struct tipc_sock *tsk = tipc_sk(sk); 2864 u32 pnode = tsk_peer_node(tsk); 2865 struct sk_buff_head list; 2866 int rc = 0; 2867 2868 __skb_queue_head_init(&list); 2869 bh_lock_sock(sk); 2870 2871 /* Try again later if socket is busy */ 2872 if (sock_owned_by_user(sk)) { 2873 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2874 bh_unlock_sock(sk); 2875 sock_put(sk); 2876 return; 2877 } 2878 2879 if (sk->sk_state == TIPC_ESTABLISHED) 2880 tipc_sk_check_probing_state(sk, &list); 2881 else if (sk->sk_state == TIPC_CONNECTING) 2882 tipc_sk_retry_connect(sk, &list); 2883 2884 bh_unlock_sock(sk); 2885 2886 if (!skb_queue_empty(&list)) 2887 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2888 2889 /* SYN messages may cause link congestion */ 2890 if (rc == -ELINKCONG) { 2891 tipc_dest_push(&tsk->cong_links, pnode, 0); 2892 tsk->cong_link_cnt = 1; 2893 } 2894 sock_put(sk); 2895 } 2896 2897 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2898 { 2899 struct sock *sk = &tsk->sk; 2900 struct net *net = sock_net(sk); 2901 struct tipc_socket_addr skaddr; 2902 struct publication *p; 2903 u32 key; 2904 2905 if (tipc_sk_connected(sk)) 2906 return -EINVAL; 2907 key = tsk->portid + tsk->pub_count + 1; 2908 if (key == tsk->portid) 2909 return -EADDRINUSE; 2910 skaddr.ref = tsk->portid; 2911 skaddr.node = tipc_own_addr(net); 2912 p = tipc_nametbl_publish(net, ua, &skaddr, key); 2913 if (unlikely(!p)) 2914 return -EINVAL; 2915 2916 list_add(&p->binding_sock, &tsk->publications); 2917 tsk->pub_count++; 2918 tsk->published = true; 2919 return 0; 2920 } 2921 2922 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2923 { 2924 struct net *net = sock_net(&tsk->sk); 2925 struct publication *safe, *p; 2926 struct tipc_uaddr _ua; 2927 int rc = -EINVAL; 2928 2929 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) { 2930 if (!ua) { 2931 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope, 2932 p->sr.type, p->sr.lower, p->sr.upper); 2933 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key); 2934 continue; 2935 } 2936 /* Unbind specific publication */ 2937 if (p->scope != ua->scope) 2938 continue; 2939 if (p->sr.type != ua->sr.type) 2940 continue; 2941 if (p->sr.lower != ua->sr.lower) 2942 continue; 2943 if (p->sr.upper != ua->sr.upper) 2944 break; 2945 tipc_nametbl_withdraw(net, ua, &p->sk, p->key); 2946 rc = 0; 2947 break; 2948 } 2949 if (list_empty(&tsk->publications)) { 2950 tsk->published = 0; 2951 rc = 0; 2952 } 2953 return rc; 2954 } 2955 2956 /* tipc_sk_reinit: set non-zero address in all existing sockets 2957 * when we go from standalone to network mode. 2958 */ 2959 void tipc_sk_reinit(struct net *net) 2960 { 2961 struct tipc_net *tn = net_generic(net, tipc_net_id); 2962 struct rhashtable_iter iter; 2963 struct tipc_sock *tsk; 2964 struct tipc_msg *msg; 2965 2966 rhashtable_walk_enter(&tn->sk_rht, &iter); 2967 2968 do { 2969 rhashtable_walk_start(&iter); 2970 2971 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2972 sock_hold(&tsk->sk); 2973 rhashtable_walk_stop(&iter); 2974 lock_sock(&tsk->sk); 2975 msg = &tsk->phdr; 2976 msg_set_prevnode(msg, tipc_own_addr(net)); 2977 msg_set_orignode(msg, tipc_own_addr(net)); 2978 release_sock(&tsk->sk); 2979 rhashtable_walk_start(&iter); 2980 sock_put(&tsk->sk); 2981 } 2982 2983 rhashtable_walk_stop(&iter); 2984 } while (tsk == ERR_PTR(-EAGAIN)); 2985 2986 rhashtable_walk_exit(&iter); 2987 } 2988 2989 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2990 { 2991 struct tipc_net *tn = net_generic(net, tipc_net_id); 2992 struct tipc_sock *tsk; 2993 2994 rcu_read_lock(); 2995 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2996 if (tsk) 2997 sock_hold(&tsk->sk); 2998 rcu_read_unlock(); 2999 3000 return tsk; 3001 } 3002 3003 static int tipc_sk_insert(struct tipc_sock *tsk) 3004 { 3005 struct sock *sk = &tsk->sk; 3006 struct net *net = sock_net(sk); 3007 struct tipc_net *tn = net_generic(net, tipc_net_id); 3008 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 3009 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; 3010 3011 while (remaining--) { 3012 portid++; 3013 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 3014 portid = TIPC_MIN_PORT; 3015 tsk->portid = portid; 3016 sock_hold(&tsk->sk); 3017 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 3018 tsk_rht_params)) 3019 return 0; 3020 sock_put(&tsk->sk); 3021 } 3022 3023 return -1; 3024 } 3025 3026 static void tipc_sk_remove(struct tipc_sock *tsk) 3027 { 3028 struct sock *sk = &tsk->sk; 3029 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3030 3031 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3032 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3033 __sock_put(sk); 3034 } 3035 } 3036 3037 static const struct rhashtable_params tsk_rht_params = { 3038 .nelem_hint = 192, 3039 .head_offset = offsetof(struct tipc_sock, node), 3040 .key_offset = offsetof(struct tipc_sock, portid), 3041 .key_len = sizeof(u32), /* portid */ 3042 .max_size = 1048576, 3043 .min_size = 256, 3044 .automatic_shrinking = true, 3045 }; 3046 3047 int tipc_sk_rht_init(struct net *net) 3048 { 3049 struct tipc_net *tn = net_generic(net, tipc_net_id); 3050 3051 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3052 } 3053 3054 void tipc_sk_rht_destroy(struct net *net) 3055 { 3056 struct tipc_net *tn = net_generic(net, tipc_net_id); 3057 3058 /* Wait for socket readers to complete */ 3059 synchronize_net(); 3060 3061 rhashtable_destroy(&tn->sk_rht); 3062 } 3063 3064 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3065 { 3066 struct net *net = sock_net(&tsk->sk); 3067 struct tipc_group *grp = tsk->group; 3068 struct tipc_msg *hdr = &tsk->phdr; 3069 struct tipc_uaddr ua; 3070 int rc; 3071 3072 if (mreq->type < TIPC_RESERVED_TYPES) 3073 return -EACCES; 3074 if (mreq->scope > TIPC_NODE_SCOPE) 3075 return -EINVAL; 3076 if (mreq->scope != TIPC_NODE_SCOPE) 3077 mreq->scope = TIPC_CLUSTER_SCOPE; 3078 if (grp) 3079 return -EACCES; 3080 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3081 if (!grp) 3082 return -ENOMEM; 3083 tsk->group = grp; 3084 msg_set_lookup_scope(hdr, mreq->scope); 3085 msg_set_nametype(hdr, mreq->type); 3086 msg_set_dest_droppable(hdr, true); 3087 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope, 3088 mreq->type, mreq->instance, mreq->instance); 3089 tipc_nametbl_build_group(net, grp, &ua); 3090 rc = tipc_sk_publish(tsk, &ua); 3091 if (rc) { 3092 tipc_group_delete(net, grp); 3093 tsk->group = NULL; 3094 return rc; 3095 } 3096 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3097 tsk->mc_method.rcast = true; 3098 tsk->mc_method.mandatory = true; 3099 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3100 return rc; 3101 } 3102 3103 static int tipc_sk_leave(struct tipc_sock *tsk) 3104 { 3105 struct net *net = sock_net(&tsk->sk); 3106 struct tipc_group *grp = tsk->group; 3107 struct tipc_uaddr ua; 3108 int scope; 3109 3110 if (!grp) 3111 return -EINVAL; 3112 ua.addrtype = TIPC_SERVICE_RANGE; 3113 tipc_group_self(grp, &ua.sr, &scope); 3114 ua.scope = scope; 3115 tipc_group_delete(net, grp); 3116 tsk->group = NULL; 3117 tipc_sk_withdraw(tsk, &ua); 3118 return 0; 3119 } 3120 3121 /** 3122 * tipc_setsockopt - set socket option 3123 * @sock: socket structure 3124 * @lvl: option level 3125 * @opt: option identifier 3126 * @ov: pointer to new option value 3127 * @ol: length of option value 3128 * 3129 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3130 * (to ease compatibility). 3131 * 3132 * Return: 0 on success, errno otherwise 3133 */ 3134 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3135 sockptr_t ov, unsigned int ol) 3136 { 3137 struct sock *sk = sock->sk; 3138 struct tipc_sock *tsk = tipc_sk(sk); 3139 struct tipc_group_req mreq; 3140 u32 value = 0; 3141 int res = 0; 3142 3143 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3144 return 0; 3145 if (lvl != SOL_TIPC) 3146 return -ENOPROTOOPT; 3147 3148 switch (opt) { 3149 case TIPC_IMPORTANCE: 3150 case TIPC_SRC_DROPPABLE: 3151 case TIPC_DEST_DROPPABLE: 3152 case TIPC_CONN_TIMEOUT: 3153 case TIPC_NODELAY: 3154 if (ol < sizeof(value)) 3155 return -EINVAL; 3156 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3157 return -EFAULT; 3158 break; 3159 case TIPC_GROUP_JOIN: 3160 if (ol < sizeof(mreq)) 3161 return -EINVAL; 3162 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3163 return -EFAULT; 3164 break; 3165 default: 3166 if (!sockptr_is_null(ov) || ol) 3167 return -EINVAL; 3168 } 3169 3170 lock_sock(sk); 3171 3172 switch (opt) { 3173 case TIPC_IMPORTANCE: 3174 res = tsk_set_importance(sk, value); 3175 break; 3176 case TIPC_SRC_DROPPABLE: 3177 if (sock->type != SOCK_STREAM) 3178 tsk_set_unreliable(tsk, value); 3179 else 3180 res = -ENOPROTOOPT; 3181 break; 3182 case TIPC_DEST_DROPPABLE: 3183 tsk_set_unreturnable(tsk, value); 3184 break; 3185 case TIPC_CONN_TIMEOUT: 3186 tipc_sk(sk)->conn_timeout = value; 3187 break; 3188 case TIPC_MCAST_BROADCAST: 3189 tsk->mc_method.rcast = false; 3190 tsk->mc_method.mandatory = true; 3191 break; 3192 case TIPC_MCAST_REPLICAST: 3193 tsk->mc_method.rcast = true; 3194 tsk->mc_method.mandatory = true; 3195 break; 3196 case TIPC_GROUP_JOIN: 3197 res = tipc_sk_join(tsk, &mreq); 3198 break; 3199 case TIPC_GROUP_LEAVE: 3200 res = tipc_sk_leave(tsk); 3201 break; 3202 case TIPC_NODELAY: 3203 tsk->nodelay = !!value; 3204 tsk_set_nagle(tsk); 3205 break; 3206 default: 3207 res = -EINVAL; 3208 } 3209 3210 release_sock(sk); 3211 3212 return res; 3213 } 3214 3215 /** 3216 * tipc_getsockopt - get socket option 3217 * @sock: socket structure 3218 * @lvl: option level 3219 * @opt: option identifier 3220 * @ov: receptacle for option value 3221 * @ol: receptacle for length of option value 3222 * 3223 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3224 * (to ease compatibility). 3225 * 3226 * Return: 0 on success, errno otherwise 3227 */ 3228 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3229 char __user *ov, int __user *ol) 3230 { 3231 struct sock *sk = sock->sk; 3232 struct tipc_sock *tsk = tipc_sk(sk); 3233 struct tipc_service_range seq; 3234 int len, scope; 3235 u32 value; 3236 int res; 3237 3238 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3239 return put_user(0, ol); 3240 if (lvl != SOL_TIPC) 3241 return -ENOPROTOOPT; 3242 res = get_user(len, ol); 3243 if (res) 3244 return res; 3245 3246 lock_sock(sk); 3247 3248 switch (opt) { 3249 case TIPC_IMPORTANCE: 3250 value = tsk_importance(tsk); 3251 break; 3252 case TIPC_SRC_DROPPABLE: 3253 value = tsk_unreliable(tsk); 3254 break; 3255 case TIPC_DEST_DROPPABLE: 3256 value = tsk_unreturnable(tsk); 3257 break; 3258 case TIPC_CONN_TIMEOUT: 3259 value = tsk->conn_timeout; 3260 /* no need to set "res", since already 0 at this point */ 3261 break; 3262 case TIPC_NODE_RECVQ_DEPTH: 3263 value = 0; /* was tipc_queue_size, now obsolete */ 3264 break; 3265 case TIPC_SOCK_RECVQ_DEPTH: 3266 value = skb_queue_len(&sk->sk_receive_queue); 3267 break; 3268 case TIPC_SOCK_RECVQ_USED: 3269 value = sk_rmem_alloc_get(sk); 3270 break; 3271 case TIPC_GROUP_JOIN: 3272 seq.type = 0; 3273 if (tsk->group) 3274 tipc_group_self(tsk->group, &seq, &scope); 3275 value = seq.type; 3276 break; 3277 default: 3278 res = -EINVAL; 3279 } 3280 3281 release_sock(sk); 3282 3283 if (res) 3284 return res; /* "get" failed */ 3285 3286 if (len < sizeof(value)) 3287 return -EINVAL; 3288 3289 if (copy_to_user(ov, &value, sizeof(value))) 3290 return -EFAULT; 3291 3292 return put_user(sizeof(value), ol); 3293 } 3294 3295 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3296 { 3297 struct net *net = sock_net(sock->sk); 3298 struct tipc_sioc_nodeid_req nr = {0}; 3299 struct tipc_sioc_ln_req lnr; 3300 void __user *argp = (void __user *)arg; 3301 3302 switch (cmd) { 3303 case SIOCGETLINKNAME: 3304 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3305 return -EFAULT; 3306 if (!tipc_node_get_linkname(net, 3307 lnr.bearer_id & 0xffff, lnr.peer, 3308 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3309 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3310 return -EFAULT; 3311 return 0; 3312 } 3313 return -EADDRNOTAVAIL; 3314 case SIOCGETNODEID: 3315 if (copy_from_user(&nr, argp, sizeof(nr))) 3316 return -EFAULT; 3317 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3318 return -EADDRNOTAVAIL; 3319 if (copy_to_user(argp, &nr, sizeof(nr))) 3320 return -EFAULT; 3321 return 0; 3322 default: 3323 return -ENOIOCTLCMD; 3324 } 3325 } 3326 3327 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3328 { 3329 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3330 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3331 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3332 3333 tsk1->peer.family = AF_TIPC; 3334 tsk1->peer.addrtype = TIPC_SOCKET_ADDR; 3335 tsk1->peer.scope = TIPC_NODE_SCOPE; 3336 tsk1->peer.addr.id.ref = tsk2->portid; 3337 tsk1->peer.addr.id.node = onode; 3338 tsk2->peer.family = AF_TIPC; 3339 tsk2->peer.addrtype = TIPC_SOCKET_ADDR; 3340 tsk2->peer.scope = TIPC_NODE_SCOPE; 3341 tsk2->peer.addr.id.ref = tsk1->portid; 3342 tsk2->peer.addr.id.node = onode; 3343 3344 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3345 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3346 return 0; 3347 } 3348 3349 /* Protocol switches for the various types of TIPC sockets */ 3350 3351 static const struct proto_ops msg_ops = { 3352 .owner = THIS_MODULE, 3353 .family = AF_TIPC, 3354 .release = tipc_release, 3355 .bind = tipc_bind, 3356 .connect = tipc_connect, 3357 .socketpair = tipc_socketpair, 3358 .accept = sock_no_accept, 3359 .getname = tipc_getname, 3360 .poll = tipc_poll, 3361 .ioctl = tipc_ioctl, 3362 .listen = sock_no_listen, 3363 .shutdown = tipc_shutdown, 3364 .setsockopt = tipc_setsockopt, 3365 .getsockopt = tipc_getsockopt, 3366 .sendmsg = tipc_sendmsg, 3367 .recvmsg = tipc_recvmsg, 3368 .mmap = sock_no_mmap, 3369 .sendpage = sock_no_sendpage 3370 }; 3371 3372 static const struct proto_ops packet_ops = { 3373 .owner = THIS_MODULE, 3374 .family = AF_TIPC, 3375 .release = tipc_release, 3376 .bind = tipc_bind, 3377 .connect = tipc_connect, 3378 .socketpair = tipc_socketpair, 3379 .accept = tipc_accept, 3380 .getname = tipc_getname, 3381 .poll = tipc_poll, 3382 .ioctl = tipc_ioctl, 3383 .listen = tipc_listen, 3384 .shutdown = tipc_shutdown, 3385 .setsockopt = tipc_setsockopt, 3386 .getsockopt = tipc_getsockopt, 3387 .sendmsg = tipc_send_packet, 3388 .recvmsg = tipc_recvmsg, 3389 .mmap = sock_no_mmap, 3390 .sendpage = sock_no_sendpage 3391 }; 3392 3393 static const struct proto_ops stream_ops = { 3394 .owner = THIS_MODULE, 3395 .family = AF_TIPC, 3396 .release = tipc_release, 3397 .bind = tipc_bind, 3398 .connect = tipc_connect, 3399 .socketpair = tipc_socketpair, 3400 .accept = tipc_accept, 3401 .getname = tipc_getname, 3402 .poll = tipc_poll, 3403 .ioctl = tipc_ioctl, 3404 .listen = tipc_listen, 3405 .shutdown = tipc_shutdown, 3406 .setsockopt = tipc_setsockopt, 3407 .getsockopt = tipc_getsockopt, 3408 .sendmsg = tipc_sendstream, 3409 .recvmsg = tipc_recvstream, 3410 .mmap = sock_no_mmap, 3411 .sendpage = sock_no_sendpage 3412 }; 3413 3414 static const struct net_proto_family tipc_family_ops = { 3415 .owner = THIS_MODULE, 3416 .family = AF_TIPC, 3417 .create = tipc_sk_create 3418 }; 3419 3420 static struct proto tipc_proto = { 3421 .name = "TIPC", 3422 .owner = THIS_MODULE, 3423 .obj_size = sizeof(struct tipc_sock), 3424 .sysctl_rmem = sysctl_tipc_rmem 3425 }; 3426 3427 /** 3428 * tipc_socket_init - initialize TIPC socket interface 3429 * 3430 * Return: 0 on success, errno otherwise 3431 */ 3432 int tipc_socket_init(void) 3433 { 3434 int res; 3435 3436 res = proto_register(&tipc_proto, 1); 3437 if (res) { 3438 pr_err("Failed to register TIPC protocol type\n"); 3439 goto out; 3440 } 3441 3442 res = sock_register(&tipc_family_ops); 3443 if (res) { 3444 pr_err("Failed to register TIPC socket type\n"); 3445 proto_unregister(&tipc_proto); 3446 goto out; 3447 } 3448 out: 3449 return res; 3450 } 3451 3452 /** 3453 * tipc_socket_stop - stop TIPC socket interface 3454 */ 3455 void tipc_socket_stop(void) 3456 { 3457 sock_unregister(tipc_family_ops.family); 3458 proto_unregister(&tipc_proto); 3459 } 3460 3461 /* Caller should hold socket lock for the passed tipc socket. */ 3462 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3463 { 3464 u32 peer_node, peer_port; 3465 u32 conn_type, conn_instance; 3466 struct nlattr *nest; 3467 3468 peer_node = tsk_peer_node(tsk); 3469 peer_port = tsk_peer_port(tsk); 3470 conn_type = msg_nametype(&tsk->phdr); 3471 conn_instance = msg_nameinst(&tsk->phdr); 3472 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3473 if (!nest) 3474 return -EMSGSIZE; 3475 3476 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3477 goto msg_full; 3478 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3479 goto msg_full; 3480 3481 if (tsk->conn_addrtype != 0) { 3482 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3483 goto msg_full; 3484 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type)) 3485 goto msg_full; 3486 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance)) 3487 goto msg_full; 3488 } 3489 nla_nest_end(skb, nest); 3490 3491 return 0; 3492 3493 msg_full: 3494 nla_nest_cancel(skb, nest); 3495 3496 return -EMSGSIZE; 3497 } 3498 3499 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3500 *tsk) 3501 { 3502 struct net *net = sock_net(skb->sk); 3503 struct sock *sk = &tsk->sk; 3504 3505 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3506 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3507 return -EMSGSIZE; 3508 3509 if (tipc_sk_connected(sk)) { 3510 if (__tipc_nl_add_sk_con(skb, tsk)) 3511 return -EMSGSIZE; 3512 } else if (!list_empty(&tsk->publications)) { 3513 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3514 return -EMSGSIZE; 3515 } 3516 return 0; 3517 } 3518 3519 /* Caller should hold socket lock for the passed tipc socket. */ 3520 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3521 struct tipc_sock *tsk) 3522 { 3523 struct nlattr *attrs; 3524 void *hdr; 3525 3526 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3527 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3528 if (!hdr) 3529 goto msg_cancel; 3530 3531 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3532 if (!attrs) 3533 goto genlmsg_cancel; 3534 3535 if (__tipc_nl_add_sk_info(skb, tsk)) 3536 goto attr_msg_cancel; 3537 3538 nla_nest_end(skb, attrs); 3539 genlmsg_end(skb, hdr); 3540 3541 return 0; 3542 3543 attr_msg_cancel: 3544 nla_nest_cancel(skb, attrs); 3545 genlmsg_cancel: 3546 genlmsg_cancel(skb, hdr); 3547 msg_cancel: 3548 return -EMSGSIZE; 3549 } 3550 3551 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3552 int (*skb_handler)(struct sk_buff *skb, 3553 struct netlink_callback *cb, 3554 struct tipc_sock *tsk)) 3555 { 3556 struct rhashtable_iter *iter = (void *)cb->args[4]; 3557 struct tipc_sock *tsk; 3558 int err; 3559 3560 rhashtable_walk_start(iter); 3561 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3562 if (IS_ERR(tsk)) { 3563 err = PTR_ERR(tsk); 3564 if (err == -EAGAIN) { 3565 err = 0; 3566 continue; 3567 } 3568 break; 3569 } 3570 3571 sock_hold(&tsk->sk); 3572 rhashtable_walk_stop(iter); 3573 lock_sock(&tsk->sk); 3574 err = skb_handler(skb, cb, tsk); 3575 if (err) { 3576 release_sock(&tsk->sk); 3577 sock_put(&tsk->sk); 3578 goto out; 3579 } 3580 release_sock(&tsk->sk); 3581 rhashtable_walk_start(iter); 3582 sock_put(&tsk->sk); 3583 } 3584 rhashtable_walk_stop(iter); 3585 out: 3586 return skb->len; 3587 } 3588 EXPORT_SYMBOL(tipc_nl_sk_walk); 3589 3590 int tipc_dump_start(struct netlink_callback *cb) 3591 { 3592 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3593 } 3594 EXPORT_SYMBOL(tipc_dump_start); 3595 3596 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3597 { 3598 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3599 struct rhashtable_iter *iter = (void *)cb->args[4]; 3600 struct tipc_net *tn = tipc_net(net); 3601 3602 if (!iter) { 3603 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3604 if (!iter) 3605 return -ENOMEM; 3606 3607 cb->args[4] = (long)iter; 3608 } 3609 3610 rhashtable_walk_enter(&tn->sk_rht, iter); 3611 return 0; 3612 } 3613 3614 int tipc_dump_done(struct netlink_callback *cb) 3615 { 3616 struct rhashtable_iter *hti = (void *)cb->args[4]; 3617 3618 rhashtable_walk_exit(hti); 3619 kfree(hti); 3620 return 0; 3621 } 3622 EXPORT_SYMBOL(tipc_dump_done); 3623 3624 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3625 struct tipc_sock *tsk, u32 sk_filter_state, 3626 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3627 { 3628 struct sock *sk = &tsk->sk; 3629 struct nlattr *attrs; 3630 struct nlattr *stat; 3631 3632 /*filter response w.r.t sk_state*/ 3633 if (!(sk_filter_state & (1 << sk->sk_state))) 3634 return 0; 3635 3636 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3637 if (!attrs) 3638 goto msg_cancel; 3639 3640 if (__tipc_nl_add_sk_info(skb, tsk)) 3641 goto attr_msg_cancel; 3642 3643 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3644 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3645 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3646 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3647 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3648 sock_i_uid(sk))) || 3649 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3650 tipc_diag_gen_cookie(sk), 3651 TIPC_NLA_SOCK_PAD)) 3652 goto attr_msg_cancel; 3653 3654 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3655 if (!stat) 3656 goto attr_msg_cancel; 3657 3658 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3659 skb_queue_len(&sk->sk_receive_queue)) || 3660 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3661 skb_queue_len(&sk->sk_write_queue)) || 3662 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3663 atomic_read(&sk->sk_drops))) 3664 goto stat_msg_cancel; 3665 3666 if (tsk->cong_link_cnt && 3667 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3668 goto stat_msg_cancel; 3669 3670 if (tsk_conn_cong(tsk) && 3671 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3672 goto stat_msg_cancel; 3673 3674 nla_nest_end(skb, stat); 3675 3676 if (tsk->group) 3677 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3678 goto stat_msg_cancel; 3679 3680 nla_nest_end(skb, attrs); 3681 3682 return 0; 3683 3684 stat_msg_cancel: 3685 nla_nest_cancel(skb, stat); 3686 attr_msg_cancel: 3687 nla_nest_cancel(skb, attrs); 3688 msg_cancel: 3689 return -EMSGSIZE; 3690 } 3691 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3692 3693 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3694 { 3695 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3696 } 3697 3698 /* Caller should hold socket lock for the passed tipc socket. */ 3699 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3700 struct netlink_callback *cb, 3701 struct publication *publ) 3702 { 3703 void *hdr; 3704 struct nlattr *attrs; 3705 3706 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3707 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3708 if (!hdr) 3709 goto msg_cancel; 3710 3711 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3712 if (!attrs) 3713 goto genlmsg_cancel; 3714 3715 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3716 goto attr_msg_cancel; 3717 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type)) 3718 goto attr_msg_cancel; 3719 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower)) 3720 goto attr_msg_cancel; 3721 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper)) 3722 goto attr_msg_cancel; 3723 3724 nla_nest_end(skb, attrs); 3725 genlmsg_end(skb, hdr); 3726 3727 return 0; 3728 3729 attr_msg_cancel: 3730 nla_nest_cancel(skb, attrs); 3731 genlmsg_cancel: 3732 genlmsg_cancel(skb, hdr); 3733 msg_cancel: 3734 return -EMSGSIZE; 3735 } 3736 3737 /* Caller should hold socket lock for the passed tipc socket. */ 3738 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3739 struct netlink_callback *cb, 3740 struct tipc_sock *tsk, u32 *last_publ) 3741 { 3742 int err; 3743 struct publication *p; 3744 3745 if (*last_publ) { 3746 list_for_each_entry(p, &tsk->publications, binding_sock) { 3747 if (p->key == *last_publ) 3748 break; 3749 } 3750 if (p->key != *last_publ) { 3751 /* We never set seq or call nl_dump_check_consistent() 3752 * this means that setting prev_seq here will cause the 3753 * consistence check to fail in the netlink callback 3754 * handler. Resulting in the last NLMSG_DONE message 3755 * having the NLM_F_DUMP_INTR flag set. 3756 */ 3757 cb->prev_seq = 1; 3758 *last_publ = 0; 3759 return -EPIPE; 3760 } 3761 } else { 3762 p = list_first_entry(&tsk->publications, struct publication, 3763 binding_sock); 3764 } 3765 3766 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3767 err = __tipc_nl_add_sk_publ(skb, cb, p); 3768 if (err) { 3769 *last_publ = p->key; 3770 return err; 3771 } 3772 } 3773 *last_publ = 0; 3774 3775 return 0; 3776 } 3777 3778 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3779 { 3780 int err; 3781 u32 tsk_portid = cb->args[0]; 3782 u32 last_publ = cb->args[1]; 3783 u32 done = cb->args[2]; 3784 struct net *net = sock_net(skb->sk); 3785 struct tipc_sock *tsk; 3786 3787 if (!tsk_portid) { 3788 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3789 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3790 3791 if (!attrs[TIPC_NLA_SOCK]) 3792 return -EINVAL; 3793 3794 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3795 attrs[TIPC_NLA_SOCK], 3796 tipc_nl_sock_policy, NULL); 3797 if (err) 3798 return err; 3799 3800 if (!sock[TIPC_NLA_SOCK_REF]) 3801 return -EINVAL; 3802 3803 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3804 } 3805 3806 if (done) 3807 return 0; 3808 3809 tsk = tipc_sk_lookup(net, tsk_portid); 3810 if (!tsk) 3811 return -EINVAL; 3812 3813 lock_sock(&tsk->sk); 3814 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3815 if (!err) 3816 done = 1; 3817 release_sock(&tsk->sk); 3818 sock_put(&tsk->sk); 3819 3820 cb->args[0] = tsk_portid; 3821 cb->args[1] = last_publ; 3822 cb->args[2] = done; 3823 3824 return skb->len; 3825 } 3826 3827 /** 3828 * tipc_sk_filtering - check if a socket should be traced 3829 * @sk: the socket to be examined 3830 * 3831 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering: 3832 * (portid, sock type, name type, name lower, name upper) 3833 * 3834 * Return: true if the socket meets the socket tuple data 3835 * (value 0 = 'any') or when there is no tuple set (all = 0), 3836 * otherwise false 3837 */ 3838 bool tipc_sk_filtering(struct sock *sk) 3839 { 3840 struct tipc_sock *tsk; 3841 struct publication *p; 3842 u32 _port, _sktype, _type, _lower, _upper; 3843 u32 type = 0, lower = 0, upper = 0; 3844 3845 if (!sk) 3846 return true; 3847 3848 tsk = tipc_sk(sk); 3849 3850 _port = sysctl_tipc_sk_filter[0]; 3851 _sktype = sysctl_tipc_sk_filter[1]; 3852 _type = sysctl_tipc_sk_filter[2]; 3853 _lower = sysctl_tipc_sk_filter[3]; 3854 _upper = sysctl_tipc_sk_filter[4]; 3855 3856 if (!_port && !_sktype && !_type && !_lower && !_upper) 3857 return true; 3858 3859 if (_port) 3860 return (_port == tsk->portid); 3861 3862 if (_sktype && _sktype != sk->sk_type) 3863 return false; 3864 3865 if (tsk->published) { 3866 p = list_first_entry_or_null(&tsk->publications, 3867 struct publication, binding_sock); 3868 if (p) { 3869 type = p->sr.type; 3870 lower = p->sr.lower; 3871 upper = p->sr.upper; 3872 } 3873 } 3874 3875 if (!tipc_sk_type_connectionless(sk)) { 3876 type = msg_nametype(&tsk->phdr); 3877 lower = msg_nameinst(&tsk->phdr); 3878 upper = lower; 3879 } 3880 3881 if ((_type && _type != type) || (_lower && _lower != lower) || 3882 (_upper && _upper != upper)) 3883 return false; 3884 3885 return true; 3886 } 3887 3888 u32 tipc_sock_get_portid(struct sock *sk) 3889 { 3890 return (sk) ? (tipc_sk(sk))->portid : 0; 3891 } 3892 3893 /** 3894 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3895 * both the rcv and backlog queues are considered 3896 * @sk: tipc sk to be checked 3897 * @skb: tipc msg to be checked 3898 * 3899 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3900 */ 3901 3902 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3903 { 3904 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3905 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3906 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3907 3908 return (qsize > lim * 90 / 100); 3909 } 3910 3911 /** 3912 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3913 * only the rcv queue is considered 3914 * @sk: tipc sk to be checked 3915 * @skb: tipc msg to be checked 3916 * 3917 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3918 */ 3919 3920 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3921 { 3922 unsigned int lim = rcvbuf_limit(sk, skb); 3923 unsigned int qsize = sk_rmem_alloc_get(sk); 3924 3925 return (qsize > lim * 90 / 100); 3926 } 3927 3928 /** 3929 * tipc_sk_dump - dump TIPC socket 3930 * @sk: tipc sk to be dumped 3931 * @dqueues: bitmask to decide if any socket queue to be dumped? 3932 * - TIPC_DUMP_NONE: don't dump socket queues 3933 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3934 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3935 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3936 * - TIPC_DUMP_ALL: dump all the socket queues above 3937 * @buf: returned buffer of dump data in format 3938 */ 3939 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3940 { 3941 int i = 0; 3942 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3943 u32 conn_type, conn_instance; 3944 struct tipc_sock *tsk; 3945 struct publication *p; 3946 bool tsk_connected; 3947 3948 if (!sk) { 3949 i += scnprintf(buf, sz, "sk data: (null)\n"); 3950 return i; 3951 } 3952 3953 tsk = tipc_sk(sk); 3954 tsk_connected = !tipc_sk_type_connectionless(sk); 3955 3956 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3957 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3958 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3959 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3960 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3961 if (tsk_connected) { 3962 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3963 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3964 conn_type = msg_nametype(&tsk->phdr); 3965 conn_instance = msg_nameinst(&tsk->phdr); 3966 i += scnprintf(buf + i, sz - i, " %u", conn_type); 3967 i += scnprintf(buf + i, sz - i, " %u", conn_instance); 3968 } 3969 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3970 if (tsk->published) { 3971 p = list_first_entry_or_null(&tsk->publications, 3972 struct publication, binding_sock); 3973 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0); 3974 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0); 3975 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0); 3976 } 3977 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3978 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3979 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3980 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3981 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3982 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3983 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3984 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3985 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3986 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3987 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3988 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3989 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3990 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3991 3992 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3993 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3994 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3995 } 3996 3997 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3998 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3999 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 4000 } 4001 4002 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 4003 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 4004 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 4005 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 4006 i += scnprintf(buf + i, sz - i, " tail "); 4007 i += tipc_skb_dump(sk->sk_backlog.tail, false, 4008 buf + i); 4009 } 4010 } 4011 4012 return i; 4013 } 4014