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 #include <trace/events/sock.h> 41 42 #include "core.h" 43 #include "name_table.h" 44 #include "node.h" 45 #include "link.h" 46 #include "name_distr.h" 47 #include "socket.h" 48 #include "bcast.h" 49 #include "netlink.h" 50 #include "group.h" 51 #include "trace.h" 52 53 #define NAGLE_START_INIT 4 54 #define NAGLE_START_MAX 1024 55 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 56 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 57 #define TIPC_MAX_PORT 0xffffffff 58 #define TIPC_MIN_PORT 1 59 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */ 60 61 enum { 62 TIPC_LISTEN = TCP_LISTEN, 63 TIPC_ESTABLISHED = TCP_ESTABLISHED, 64 TIPC_OPEN = TCP_CLOSE, 65 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 66 TIPC_CONNECTING = TCP_SYN_SENT, 67 }; 68 69 struct sockaddr_pair { 70 struct sockaddr_tipc sock; 71 struct sockaddr_tipc member; 72 }; 73 74 /** 75 * struct tipc_sock - TIPC socket structure 76 * @sk: socket - interacts with 'port' and with user via the socket API 77 * @max_pkt: maximum packet size "hint" used when building messages sent by port 78 * @maxnagle: maximum size of msg which can be subject to nagle 79 * @portid: unique port identity in TIPC socket hash table 80 * @phdr: preformatted message header used when sending messages 81 * @cong_links: list of congested links 82 * @publications: list of publications for port 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 void tipc_sk_timeout(struct timer_list *t); 150 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua); 151 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua); 152 static int tipc_sk_leave(struct tipc_sock *tsk); 153 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 154 static int tipc_sk_insert(struct tipc_sock *tsk); 155 static void tipc_sk_remove(struct tipc_sock *tsk); 156 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 157 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 158 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 159 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p); 160 161 static const struct proto_ops packet_ops; 162 static const struct proto_ops stream_ops; 163 static const struct proto_ops msg_ops; 164 static struct proto tipc_proto; 165 static const struct rhashtable_params tsk_rht_params; 166 167 static u32 tsk_own_node(struct tipc_sock *tsk) 168 { 169 return msg_prevnode(&tsk->phdr); 170 } 171 172 static u32 tsk_peer_node(struct tipc_sock *tsk) 173 { 174 return msg_destnode(&tsk->phdr); 175 } 176 177 static u32 tsk_peer_port(struct tipc_sock *tsk) 178 { 179 return msg_destport(&tsk->phdr); 180 } 181 182 static bool tsk_unreliable(struct tipc_sock *tsk) 183 { 184 return msg_src_droppable(&tsk->phdr) != 0; 185 } 186 187 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 188 { 189 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 190 } 191 192 static bool tsk_unreturnable(struct tipc_sock *tsk) 193 { 194 return msg_dest_droppable(&tsk->phdr) != 0; 195 } 196 197 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 198 { 199 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 200 } 201 202 static int tsk_importance(struct tipc_sock *tsk) 203 { 204 return msg_importance(&tsk->phdr); 205 } 206 207 static struct tipc_sock *tipc_sk(const struct sock *sk) 208 { 209 return container_of(sk, struct tipc_sock, sk); 210 } 211 212 int tsk_set_importance(struct sock *sk, int imp) 213 { 214 if (imp > TIPC_CRITICAL_IMPORTANCE) 215 return -EINVAL; 216 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 217 return 0; 218 } 219 220 static bool tsk_conn_cong(struct tipc_sock *tsk) 221 { 222 return tsk->snt_unacked > tsk->snd_win; 223 } 224 225 static u16 tsk_blocks(int len) 226 { 227 return ((len / FLOWCTL_BLK_SZ) + 1); 228 } 229 230 /* tsk_blocks(): translate a buffer size in bytes to number of 231 * advertisable blocks, taking into account the ratio truesize(len)/len 232 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 233 */ 234 static u16 tsk_adv_blocks(int len) 235 { 236 return len / FLOWCTL_BLK_SZ / 4; 237 } 238 239 /* tsk_inc(): increment counter for sent or received data 240 * - If block based flow control is not supported by peer we 241 * fall back to message based ditto, incrementing the counter 242 */ 243 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 244 { 245 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 246 return ((msglen / FLOWCTL_BLK_SZ) + 1); 247 return 1; 248 } 249 250 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 251 */ 252 static void tsk_set_nagle(struct tipc_sock *tsk) 253 { 254 struct sock *sk = &tsk->sk; 255 256 tsk->maxnagle = 0; 257 if (sk->sk_type != SOCK_STREAM) 258 return; 259 if (tsk->nodelay) 260 return; 261 if (!(tsk->peer_caps & TIPC_NAGLE)) 262 return; 263 /* Limit node local buffer size to avoid receive queue overflow */ 264 if (tsk->max_pkt == MAX_MSG_SIZE) 265 tsk->maxnagle = 1500; 266 else 267 tsk->maxnagle = tsk->max_pkt; 268 } 269 270 /** 271 * tsk_advance_rx_queue - discard first buffer in socket receive queue 272 * @sk: network socket 273 * 274 * Caller must hold socket lock 275 */ 276 static void tsk_advance_rx_queue(struct sock *sk) 277 { 278 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 279 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 280 } 281 282 /* tipc_sk_respond() : send response message back to sender 283 */ 284 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 285 { 286 u32 selector; 287 u32 dnode; 288 u32 onode = tipc_own_addr(sock_net(sk)); 289 290 if (!tipc_msg_reverse(onode, &skb, err)) 291 return; 292 293 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 294 dnode = msg_destnode(buf_msg(skb)); 295 selector = msg_origport(buf_msg(skb)); 296 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 297 } 298 299 /** 300 * tsk_rej_rx_queue - reject all buffers in socket receive queue 301 * @sk: network socket 302 * @error: response error code 303 * 304 * Caller must hold socket lock 305 */ 306 static void tsk_rej_rx_queue(struct sock *sk, int error) 307 { 308 struct sk_buff *skb; 309 310 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 311 tipc_sk_respond(sk, skb, error); 312 } 313 314 static bool tipc_sk_connected(const struct sock *sk) 315 { 316 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED; 317 } 318 319 /* tipc_sk_type_connectionless - check if the socket is datagram socket 320 * @sk: socket 321 * 322 * Returns true if connection less, false otherwise 323 */ 324 static bool tipc_sk_type_connectionless(struct sock *sk) 325 { 326 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 327 } 328 329 /* tsk_peer_msg - verify if message was sent by connected port's peer 330 * 331 * Handles cases where the node's network address has changed from 332 * the default of <0.0.0> to its configured setting. 333 */ 334 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 335 { 336 struct sock *sk = &tsk->sk; 337 u32 self = tipc_own_addr(sock_net(sk)); 338 u32 peer_port = tsk_peer_port(tsk); 339 u32 orig_node, peer_node; 340 341 if (unlikely(!tipc_sk_connected(sk))) 342 return false; 343 344 if (unlikely(msg_origport(msg) != peer_port)) 345 return false; 346 347 orig_node = msg_orignode(msg); 348 peer_node = tsk_peer_node(tsk); 349 350 if (likely(orig_node == peer_node)) 351 return true; 352 353 if (!orig_node && peer_node == self) 354 return true; 355 356 if (!peer_node && orig_node == self) 357 return true; 358 359 return false; 360 } 361 362 /* tipc_set_sk_state - set the sk_state of the socket 363 * @sk: socket 364 * 365 * Caller must hold socket lock 366 * 367 * Returns 0 on success, errno otherwise 368 */ 369 static int tipc_set_sk_state(struct sock *sk, int state) 370 { 371 int oldsk_state = sk->sk_state; 372 int res = -EINVAL; 373 374 switch (state) { 375 case TIPC_OPEN: 376 res = 0; 377 break; 378 case TIPC_LISTEN: 379 case TIPC_CONNECTING: 380 if (oldsk_state == TIPC_OPEN) 381 res = 0; 382 break; 383 case TIPC_ESTABLISHED: 384 if (oldsk_state == TIPC_CONNECTING || 385 oldsk_state == TIPC_OPEN) 386 res = 0; 387 break; 388 case TIPC_DISCONNECTING: 389 if (oldsk_state == TIPC_CONNECTING || 390 oldsk_state == TIPC_ESTABLISHED) 391 res = 0; 392 break; 393 } 394 395 if (!res) 396 sk->sk_state = state; 397 398 return res; 399 } 400 401 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 402 { 403 struct sock *sk = sock->sk; 404 int err = sock_error(sk); 405 int typ = sock->type; 406 407 if (err) 408 return err; 409 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 410 if (sk->sk_state == TIPC_DISCONNECTING) 411 return -EPIPE; 412 else if (!tipc_sk_connected(sk)) 413 return -ENOTCONN; 414 } 415 if (!*timeout) 416 return -EAGAIN; 417 if (signal_pending(current)) 418 return sock_intr_errno(*timeout); 419 420 return 0; 421 } 422 423 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 424 ({ \ 425 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 426 struct sock *sk_; \ 427 int rc_; \ 428 \ 429 while ((rc_ = !(condition_))) { \ 430 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 431 smp_rmb(); \ 432 sk_ = (sock_)->sk; \ 433 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 434 if (rc_) \ 435 break; \ 436 add_wait_queue(sk_sleep(sk_), &wait_); \ 437 release_sock(sk_); \ 438 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 439 sched_annotate_sleep(); \ 440 lock_sock(sk_); \ 441 remove_wait_queue(sk_sleep(sk_), &wait_); \ 442 } \ 443 rc_; \ 444 }) 445 446 /** 447 * tipc_sk_create - create a TIPC socket 448 * @net: network namespace (must be default network) 449 * @sock: pre-allocated socket structure 450 * @protocol: protocol indicator (must be 0) 451 * @kern: caused by kernel or by userspace? 452 * 453 * This routine creates additional data structures used by the TIPC socket, 454 * initializes them, and links them together. 455 * 456 * Return: 0 on success, errno otherwise 457 */ 458 static int tipc_sk_create(struct net *net, struct socket *sock, 459 int protocol, int kern) 460 { 461 const struct proto_ops *ops; 462 struct sock *sk; 463 struct tipc_sock *tsk; 464 struct tipc_msg *msg; 465 466 /* Validate arguments */ 467 if (unlikely(protocol != 0)) 468 return -EPROTONOSUPPORT; 469 470 switch (sock->type) { 471 case SOCK_STREAM: 472 ops = &stream_ops; 473 break; 474 case SOCK_SEQPACKET: 475 ops = &packet_ops; 476 break; 477 case SOCK_DGRAM: 478 case SOCK_RDM: 479 ops = &msg_ops; 480 break; 481 default: 482 return -EPROTOTYPE; 483 } 484 485 /* Allocate socket's protocol area */ 486 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 487 if (sk == NULL) 488 return -ENOMEM; 489 490 tsk = tipc_sk(sk); 491 tsk->max_pkt = MAX_PKT_DEFAULT; 492 tsk->maxnagle = 0; 493 tsk->nagle_start = NAGLE_START_INIT; 494 INIT_LIST_HEAD(&tsk->publications); 495 INIT_LIST_HEAD(&tsk->cong_links); 496 msg = &tsk->phdr; 497 498 /* Finish initializing socket data structures */ 499 sock->ops = ops; 500 sock_init_data(sock, sk); 501 tipc_set_sk_state(sk, TIPC_OPEN); 502 if (tipc_sk_insert(tsk)) { 503 sk_free(sk); 504 pr_warn("Socket create failed; port number exhausted\n"); 505 return -EINVAL; 506 } 507 508 /* Ensure tsk is visible before we read own_addr. */ 509 smp_mb(); 510 511 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 512 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 513 514 msg_set_origport(msg, tsk->portid); 515 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 516 sk->sk_shutdown = 0; 517 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 518 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]); 519 sk->sk_data_ready = tipc_data_ready; 520 sk->sk_write_space = tipc_write_space; 521 sk->sk_destruct = tipc_sock_destruct; 522 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 523 tsk->group_is_open = true; 524 atomic_set(&tsk->dupl_rcvcnt, 0); 525 526 /* Start out with safe limits until we receive an advertised window */ 527 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 528 tsk->rcv_win = tsk->snd_win; 529 530 if (tipc_sk_type_connectionless(sk)) { 531 tsk_set_unreturnable(tsk, true); 532 if (sock->type == SOCK_DGRAM) 533 tsk_set_unreliable(tsk, true); 534 } 535 __skb_queue_head_init(&tsk->mc_method.deferredq); 536 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 537 return 0; 538 } 539 540 static void tipc_sk_callback(struct rcu_head *head) 541 { 542 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 543 544 sock_put(&tsk->sk); 545 } 546 547 /* Caller should hold socket lock for the socket. */ 548 static void __tipc_shutdown(struct socket *sock, int error) 549 { 550 struct sock *sk = sock->sk; 551 struct tipc_sock *tsk = tipc_sk(sk); 552 struct net *net = sock_net(sk); 553 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 554 u32 dnode = tsk_peer_node(tsk); 555 struct sk_buff *skb; 556 557 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 558 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 559 !tsk_conn_cong(tsk))); 560 561 /* Push out delayed messages if in Nagle mode */ 562 tipc_sk_push_backlog(tsk, false); 563 /* Remove pending SYN */ 564 __skb_queue_purge(&sk->sk_write_queue); 565 566 /* Remove partially received buffer if any */ 567 skb = skb_peek(&sk->sk_receive_queue); 568 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 569 __skb_unlink(skb, &sk->sk_receive_queue); 570 kfree_skb(skb); 571 } 572 573 /* Reject all unreceived messages if connectionless */ 574 if (tipc_sk_type_connectionless(sk)) { 575 tsk_rej_rx_queue(sk, error); 576 return; 577 } 578 579 switch (sk->sk_state) { 580 case TIPC_CONNECTING: 581 case TIPC_ESTABLISHED: 582 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 583 tipc_node_remove_conn(net, dnode, tsk->portid); 584 /* Send a FIN+/- to its peer */ 585 skb = __skb_dequeue(&sk->sk_receive_queue); 586 if (skb) { 587 __skb_queue_purge(&sk->sk_receive_queue); 588 tipc_sk_respond(sk, skb, error); 589 break; 590 } 591 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 592 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 593 tsk_own_node(tsk), tsk_peer_port(tsk), 594 tsk->portid, error); 595 if (skb) 596 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 597 break; 598 case TIPC_LISTEN: 599 /* Reject all SYN messages */ 600 tsk_rej_rx_queue(sk, error); 601 break; 602 default: 603 __skb_queue_purge(&sk->sk_receive_queue); 604 break; 605 } 606 } 607 608 /** 609 * tipc_release - destroy a TIPC socket 610 * @sock: socket to destroy 611 * 612 * This routine cleans up any messages that are still queued on the socket. 613 * For DGRAM and RDM socket types, all queued messages are rejected. 614 * For SEQPACKET and STREAM socket types, the first message is rejected 615 * and any others are discarded. (If the first message on a STREAM socket 616 * is partially-read, it is discarded and the next one is rejected instead.) 617 * 618 * NOTE: Rejected messages are not necessarily returned to the sender! They 619 * are returned or discarded according to the "destination droppable" setting 620 * specified for the message by the sender. 621 * 622 * Return: 0 on success, errno otherwise 623 */ 624 static int tipc_release(struct socket *sock) 625 { 626 struct sock *sk = sock->sk; 627 struct tipc_sock *tsk; 628 629 /* 630 * Exit if socket isn't fully initialized (occurs when a failed accept() 631 * releases a pre-allocated child socket that was never used) 632 */ 633 if (sk == NULL) 634 return 0; 635 636 tsk = tipc_sk(sk); 637 lock_sock(sk); 638 639 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 640 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 641 sk->sk_shutdown = SHUTDOWN_MASK; 642 tipc_sk_leave(tsk); 643 tipc_sk_withdraw(tsk, NULL); 644 __skb_queue_purge(&tsk->mc_method.deferredq); 645 sk_stop_timer(sk, &sk->sk_timer); 646 tipc_sk_remove(tsk); 647 648 sock_orphan(sk); 649 /* Reject any messages that accumulated in backlog queue */ 650 release_sock(sk); 651 tipc_dest_list_purge(&tsk->cong_links); 652 tsk->cong_link_cnt = 0; 653 call_rcu(&tsk->rcu, tipc_sk_callback); 654 sock->sk = NULL; 655 656 return 0; 657 } 658 659 /** 660 * __tipc_bind - associate or disassociate TIPC name(s) with a socket 661 * @sock: socket structure 662 * @skaddr: socket address describing name(s) and desired operation 663 * @alen: size of socket address data structure 664 * 665 * Name and name sequence binding are indicated using a positive scope value; 666 * a negative scope value unbinds the specified name. Specifying no name 667 * (i.e. a socket address length of 0) unbinds all names from the socket. 668 * 669 * Return: 0 on success, errno otherwise 670 * 671 * NOTE: This routine doesn't need to take the socket lock since it doesn't 672 * access any non-constant socket information. 673 */ 674 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 675 { 676 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 677 struct tipc_sock *tsk = tipc_sk(sock->sk); 678 bool unbind = false; 679 680 if (unlikely(!alen)) 681 return tipc_sk_withdraw(tsk, NULL); 682 683 if (ua->addrtype == TIPC_SERVICE_ADDR) { 684 ua->addrtype = TIPC_SERVICE_RANGE; 685 ua->sr.upper = ua->sr.lower; 686 } 687 if (ua->scope < 0) { 688 unbind = true; 689 ua->scope = -ua->scope; 690 } 691 /* Users may still use deprecated TIPC_ZONE_SCOPE */ 692 if (ua->scope != TIPC_NODE_SCOPE) 693 ua->scope = TIPC_CLUSTER_SCOPE; 694 695 if (tsk->group) 696 return -EACCES; 697 698 if (unbind) 699 return tipc_sk_withdraw(tsk, ua); 700 return tipc_sk_publish(tsk, ua); 701 } 702 703 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 704 { 705 int res; 706 707 lock_sock(sock->sk); 708 res = __tipc_bind(sock, skaddr, alen); 709 release_sock(sock->sk); 710 return res; 711 } 712 713 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 714 { 715 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 716 u32 atype = ua->addrtype; 717 718 if (alen) { 719 if (!tipc_uaddr_valid(ua, alen)) 720 return -EINVAL; 721 if (atype == TIPC_SOCKET_ADDR) 722 return -EAFNOSUPPORT; 723 if (ua->sr.type < TIPC_RESERVED_TYPES) { 724 pr_warn_once("Can't bind to reserved service type %u\n", 725 ua->sr.type); 726 return -EACCES; 727 } 728 } 729 return tipc_sk_bind(sock, skaddr, alen); 730 } 731 732 /** 733 * tipc_getname - get port ID of socket or peer socket 734 * @sock: socket structure 735 * @uaddr: area for returned socket address 736 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 737 * 738 * Return: 0 on success, errno otherwise 739 * 740 * NOTE: This routine doesn't need to take the socket lock since it only 741 * accesses socket information that is unchanging (or which changes in 742 * a completely predictable manner). 743 */ 744 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 745 int peer) 746 { 747 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 748 struct sock *sk = sock->sk; 749 struct tipc_sock *tsk = tipc_sk(sk); 750 751 memset(addr, 0, sizeof(*addr)); 752 if (peer) { 753 if ((!tipc_sk_connected(sk)) && 754 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 755 return -ENOTCONN; 756 addr->addr.id.ref = tsk_peer_port(tsk); 757 addr->addr.id.node = tsk_peer_node(tsk); 758 } else { 759 addr->addr.id.ref = tsk->portid; 760 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 761 } 762 763 addr->addrtype = TIPC_SOCKET_ADDR; 764 addr->family = AF_TIPC; 765 addr->scope = 0; 766 addr->addr.name.domain = 0; 767 768 return sizeof(*addr); 769 } 770 771 /** 772 * tipc_poll - read and possibly block on pollmask 773 * @file: file structure associated with the socket 774 * @sock: socket for which to calculate the poll bits 775 * @wait: ??? 776 * 777 * Return: pollmask value 778 * 779 * COMMENTARY: 780 * It appears that the usual socket locking mechanisms are not useful here 781 * since the pollmask info is potentially out-of-date the moment this routine 782 * exits. TCP and other protocols seem to rely on higher level poll routines 783 * to handle any preventable race conditions, so TIPC will do the same ... 784 * 785 * IMPORTANT: The fact that a read or write operation is indicated does NOT 786 * imply that the operation will succeed, merely that it should be performed 787 * and will not block. 788 */ 789 static __poll_t tipc_poll(struct file *file, struct socket *sock, 790 poll_table *wait) 791 { 792 struct sock *sk = sock->sk; 793 struct tipc_sock *tsk = tipc_sk(sk); 794 __poll_t revents = 0; 795 796 sock_poll_wait(file, sock, wait); 797 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 798 799 if (sk->sk_shutdown & RCV_SHUTDOWN) 800 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 801 if (sk->sk_shutdown == SHUTDOWN_MASK) 802 revents |= EPOLLHUP; 803 804 switch (sk->sk_state) { 805 case TIPC_ESTABLISHED: 806 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 807 revents |= EPOLLOUT; 808 fallthrough; 809 case TIPC_LISTEN: 810 case TIPC_CONNECTING: 811 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 812 revents |= EPOLLIN | EPOLLRDNORM; 813 break; 814 case TIPC_OPEN: 815 if (tsk->group_is_open && !tsk->cong_link_cnt) 816 revents |= EPOLLOUT; 817 if (!tipc_sk_type_connectionless(sk)) 818 break; 819 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 820 break; 821 revents |= EPOLLIN | EPOLLRDNORM; 822 break; 823 case TIPC_DISCONNECTING: 824 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 825 break; 826 } 827 return revents; 828 } 829 830 /** 831 * tipc_sendmcast - send multicast message 832 * @sock: socket structure 833 * @ua: destination address struct 834 * @msg: message to send 835 * @dlen: length of data to send 836 * @timeout: timeout to wait for wakeup 837 * 838 * Called from function tipc_sendmsg(), which has done all sanity checks 839 * Return: the number of bytes sent on success, or errno 840 */ 841 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua, 842 struct msghdr *msg, size_t dlen, long timeout) 843 { 844 struct sock *sk = sock->sk; 845 struct tipc_sock *tsk = tipc_sk(sk); 846 struct tipc_msg *hdr = &tsk->phdr; 847 struct net *net = sock_net(sk); 848 int mtu = tipc_bcast_get_mtu(net); 849 struct sk_buff_head pkts; 850 struct tipc_nlist dsts; 851 int rc; 852 853 if (tsk->group) 854 return -EACCES; 855 856 /* Block or return if any destination link is congested */ 857 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 858 if (unlikely(rc)) 859 return rc; 860 861 /* Lookup destination nodes */ 862 tipc_nlist_init(&dsts, tipc_own_addr(net)); 863 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts); 864 if (!dsts.local && !dsts.remote) 865 return -EHOSTUNREACH; 866 867 /* Build message header */ 868 msg_set_type(hdr, TIPC_MCAST_MSG); 869 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 870 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 871 msg_set_destport(hdr, 0); 872 msg_set_destnode(hdr, 0); 873 msg_set_nametype(hdr, ua->sr.type); 874 msg_set_namelower(hdr, ua->sr.lower); 875 msg_set_nameupper(hdr, ua->sr.upper); 876 877 /* Build message as chain of buffers */ 878 __skb_queue_head_init(&pkts); 879 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 880 881 /* Send message if build was successful */ 882 if (unlikely(rc == dlen)) { 883 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 884 TIPC_DUMP_SK_SNDQ, " "); 885 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts, 886 &tsk->cong_link_cnt); 887 } 888 889 tipc_nlist_purge(&dsts); 890 891 return rc ? rc : dlen; 892 } 893 894 /** 895 * tipc_send_group_msg - send a message to a member in the group 896 * @net: network namespace 897 * @tsk: tipc socket 898 * @m: message to send 899 * @mb: group member 900 * @dnode: destination node 901 * @dport: destination port 902 * @dlen: total length of message data 903 */ 904 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 905 struct msghdr *m, struct tipc_member *mb, 906 u32 dnode, u32 dport, int dlen) 907 { 908 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 909 struct tipc_mc_method *method = &tsk->mc_method; 910 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 911 struct tipc_msg *hdr = &tsk->phdr; 912 struct sk_buff_head pkts; 913 int mtu, rc; 914 915 /* Complete message header */ 916 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 917 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 918 msg_set_destport(hdr, dport); 919 msg_set_destnode(hdr, dnode); 920 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 921 922 /* Build message as chain of buffers */ 923 __skb_queue_head_init(&pkts); 924 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 925 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 926 if (unlikely(rc != dlen)) 927 return rc; 928 929 /* Send message */ 930 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 931 if (unlikely(rc == -ELINKCONG)) { 932 tipc_dest_push(&tsk->cong_links, dnode, 0); 933 tsk->cong_link_cnt++; 934 } 935 936 /* Update send window */ 937 tipc_group_update_member(mb, blks); 938 939 /* A broadcast sent within next EXPIRE period must follow same path */ 940 method->rcast = true; 941 method->mandatory = true; 942 return dlen; 943 } 944 945 /** 946 * tipc_send_group_unicast - send message to a member in the group 947 * @sock: socket structure 948 * @m: message to send 949 * @dlen: total length of message data 950 * @timeout: timeout to wait for wakeup 951 * 952 * Called from function tipc_sendmsg(), which has done all sanity checks 953 * Return: the number of bytes sent on success, or errno 954 */ 955 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 956 int dlen, long timeout) 957 { 958 struct sock *sk = sock->sk; 959 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 960 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 961 struct tipc_sock *tsk = tipc_sk(sk); 962 struct net *net = sock_net(sk); 963 struct tipc_member *mb = NULL; 964 u32 node, port; 965 int rc; 966 967 node = ua->sk.node; 968 port = ua->sk.ref; 969 if (!port && !node) 970 return -EHOSTUNREACH; 971 972 /* Block or return if destination link or member is congested */ 973 rc = tipc_wait_for_cond(sock, &timeout, 974 !tipc_dest_find(&tsk->cong_links, node, 0) && 975 tsk->group && 976 !tipc_group_cong(tsk->group, node, port, blks, 977 &mb)); 978 if (unlikely(rc)) 979 return rc; 980 981 if (unlikely(!mb)) 982 return -EHOSTUNREACH; 983 984 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 985 986 return rc ? rc : dlen; 987 } 988 989 /** 990 * tipc_send_group_anycast - send message to any member with given identity 991 * @sock: socket structure 992 * @m: message to send 993 * @dlen: total length of message data 994 * @timeout: timeout to wait for wakeup 995 * 996 * Called from function tipc_sendmsg(), which has done all sanity checks 997 * Return: the number of bytes sent on success, or errno 998 */ 999 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 1000 int dlen, long timeout) 1001 { 1002 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1003 struct sock *sk = sock->sk; 1004 struct tipc_sock *tsk = tipc_sk(sk); 1005 struct list_head *cong_links = &tsk->cong_links; 1006 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 1007 struct tipc_msg *hdr = &tsk->phdr; 1008 struct tipc_member *first = NULL; 1009 struct tipc_member *mbr = NULL; 1010 struct net *net = sock_net(sk); 1011 u32 node, port, exclude; 1012 LIST_HEAD(dsts); 1013 int lookups = 0; 1014 int dstcnt, rc; 1015 bool cong; 1016 1017 ua->sa.type = msg_nametype(hdr); 1018 ua->scope = msg_lookup_scope(hdr); 1019 1020 while (++lookups < 4) { 1021 exclude = tipc_group_exclude(tsk->group); 1022 1023 first = NULL; 1024 1025 /* Look for a non-congested destination member, if any */ 1026 while (1) { 1027 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, 1028 exclude, false)) 1029 return -EHOSTUNREACH; 1030 tipc_dest_pop(&dsts, &node, &port); 1031 cong = tipc_group_cong(tsk->group, node, port, blks, 1032 &mbr); 1033 if (!cong) 1034 break; 1035 if (mbr == first) 1036 break; 1037 if (!first) 1038 first = mbr; 1039 } 1040 1041 /* Start over if destination was not in member list */ 1042 if (unlikely(!mbr)) 1043 continue; 1044 1045 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1046 break; 1047 1048 /* Block or return if destination link or member is congested */ 1049 rc = tipc_wait_for_cond(sock, &timeout, 1050 !tipc_dest_find(cong_links, node, 0) && 1051 tsk->group && 1052 !tipc_group_cong(tsk->group, node, port, 1053 blks, &mbr)); 1054 if (unlikely(rc)) 1055 return rc; 1056 1057 /* Send, unless destination disappeared while waiting */ 1058 if (likely(mbr)) 1059 break; 1060 } 1061 1062 if (unlikely(lookups >= 4)) 1063 return -EHOSTUNREACH; 1064 1065 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1066 1067 return rc ? rc : dlen; 1068 } 1069 1070 /** 1071 * tipc_send_group_bcast - send message to all members in communication group 1072 * @sock: socket structure 1073 * @m: message to send 1074 * @dlen: total length of message data 1075 * @timeout: timeout to wait for wakeup 1076 * 1077 * Called from function tipc_sendmsg(), which has done all sanity checks 1078 * Return: the number of bytes sent on success, or errno 1079 */ 1080 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1081 int dlen, long timeout) 1082 { 1083 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1084 struct sock *sk = sock->sk; 1085 struct net *net = sock_net(sk); 1086 struct tipc_sock *tsk = tipc_sk(sk); 1087 struct tipc_nlist *dsts; 1088 struct tipc_mc_method *method = &tsk->mc_method; 1089 bool ack = method->mandatory && method->rcast; 1090 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1091 struct tipc_msg *hdr = &tsk->phdr; 1092 int mtu = tipc_bcast_get_mtu(net); 1093 struct sk_buff_head pkts; 1094 int rc = -EHOSTUNREACH; 1095 1096 /* Block or return if any destination link or member is congested */ 1097 rc = tipc_wait_for_cond(sock, &timeout, 1098 !tsk->cong_link_cnt && tsk->group && 1099 !tipc_group_bc_cong(tsk->group, blks)); 1100 if (unlikely(rc)) 1101 return rc; 1102 1103 dsts = tipc_group_dests(tsk->group); 1104 if (!dsts->local && !dsts->remote) 1105 return -EHOSTUNREACH; 1106 1107 /* Complete message header */ 1108 if (ua) { 1109 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1110 msg_set_nameinst(hdr, ua->sa.instance); 1111 } else { 1112 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1113 msg_set_nameinst(hdr, 0); 1114 } 1115 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1116 msg_set_destport(hdr, 0); 1117 msg_set_destnode(hdr, 0); 1118 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1119 1120 /* Avoid getting stuck with repeated forced replicasts */ 1121 msg_set_grp_bc_ack_req(hdr, ack); 1122 1123 /* Build message as chain of buffers */ 1124 __skb_queue_head_init(&pkts); 1125 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1126 if (unlikely(rc != dlen)) 1127 return rc; 1128 1129 /* Send message */ 1130 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1131 if (unlikely(rc)) 1132 return rc; 1133 1134 /* Update broadcast sequence number and send windows */ 1135 tipc_group_update_bc_members(tsk->group, blks, ack); 1136 1137 /* Broadcast link is now free to choose method for next broadcast */ 1138 method->mandatory = false; 1139 method->expires = jiffies; 1140 1141 return dlen; 1142 } 1143 1144 /** 1145 * tipc_send_group_mcast - send message to all members with given identity 1146 * @sock: socket structure 1147 * @m: message to send 1148 * @dlen: total length of message data 1149 * @timeout: timeout to wait for wakeup 1150 * 1151 * Called from function tipc_sendmsg(), which has done all sanity checks 1152 * Return: the number of bytes sent on success, or errno 1153 */ 1154 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1155 int dlen, long timeout) 1156 { 1157 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1158 struct sock *sk = sock->sk; 1159 struct tipc_sock *tsk = tipc_sk(sk); 1160 struct tipc_group *grp = tsk->group; 1161 struct tipc_msg *hdr = &tsk->phdr; 1162 struct net *net = sock_net(sk); 1163 u32 dstcnt, exclude; 1164 LIST_HEAD(dsts); 1165 1166 ua->sa.type = msg_nametype(hdr); 1167 ua->scope = msg_lookup_scope(hdr); 1168 exclude = tipc_group_exclude(grp); 1169 1170 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true)) 1171 return -EHOSTUNREACH; 1172 1173 if (dstcnt == 1) { 1174 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref); 1175 return tipc_send_group_unicast(sock, m, dlen, timeout); 1176 } 1177 1178 tipc_dest_list_purge(&dsts); 1179 return tipc_send_group_bcast(sock, m, dlen, timeout); 1180 } 1181 1182 /** 1183 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1184 * @net: the associated network namespace 1185 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1186 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1187 * 1188 * Multi-threaded: parallel calls with reference to same queues may occur 1189 */ 1190 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1191 struct sk_buff_head *inputq) 1192 { 1193 u32 self = tipc_own_addr(net); 1194 struct sk_buff *skb, *_skb; 1195 u32 portid, onode; 1196 struct sk_buff_head tmpq; 1197 struct list_head dports; 1198 struct tipc_msg *hdr; 1199 struct tipc_uaddr ua; 1200 int user, mtyp, hlen; 1201 1202 __skb_queue_head_init(&tmpq); 1203 INIT_LIST_HEAD(&dports); 1204 ua.addrtype = TIPC_SERVICE_RANGE; 1205 1206 /* tipc_skb_peek() increments the head skb's reference counter */ 1207 skb = tipc_skb_peek(arrvq, &inputq->lock); 1208 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1209 hdr = buf_msg(skb); 1210 user = msg_user(hdr); 1211 mtyp = msg_type(hdr); 1212 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1213 onode = msg_orignode(hdr); 1214 ua.sr.type = msg_nametype(hdr); 1215 ua.sr.lower = msg_namelower(hdr); 1216 ua.sr.upper = msg_nameupper(hdr); 1217 if (onode == self) 1218 ua.scope = TIPC_ANY_SCOPE; 1219 else 1220 ua.scope = TIPC_CLUSTER_SCOPE; 1221 1222 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1223 spin_lock_bh(&inputq->lock); 1224 if (skb_peek(arrvq) == skb) { 1225 __skb_dequeue(arrvq); 1226 __skb_queue_tail(inputq, skb); 1227 } 1228 kfree_skb(skb); 1229 spin_unlock_bh(&inputq->lock); 1230 continue; 1231 } 1232 1233 /* Group messages require exact scope match */ 1234 if (msg_in_group(hdr)) { 1235 ua.sr.lower = 0; 1236 ua.sr.upper = ~0; 1237 ua.scope = msg_lookup_scope(hdr); 1238 } 1239 1240 /* Create destination port list: */ 1241 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports); 1242 1243 /* Clone message per destination */ 1244 while (tipc_dest_pop(&dports, NULL, &portid)) { 1245 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1246 if (_skb) { 1247 msg_set_destport(buf_msg(_skb), portid); 1248 __skb_queue_tail(&tmpq, _skb); 1249 continue; 1250 } 1251 pr_warn("Failed to clone mcast rcv buffer\n"); 1252 } 1253 /* Append clones to inputq only if skb is still head of arrvq */ 1254 spin_lock_bh(&inputq->lock); 1255 if (skb_peek(arrvq) == skb) { 1256 skb_queue_splice_tail_init(&tmpq, inputq); 1257 /* Decrement the skb's refcnt */ 1258 kfree_skb(__skb_dequeue(arrvq)); 1259 } 1260 spin_unlock_bh(&inputq->lock); 1261 __skb_queue_purge(&tmpq); 1262 kfree_skb(skb); 1263 } 1264 tipc_sk_rcv(net, inputq); 1265 } 1266 1267 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1268 * when socket is in Nagle mode 1269 */ 1270 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1271 { 1272 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1273 struct sk_buff *skb = skb_peek_tail(txq); 1274 struct net *net = sock_net(&tsk->sk); 1275 u32 dnode = tsk_peer_node(tsk); 1276 int rc; 1277 1278 if (nagle_ack) { 1279 tsk->pkt_cnt += skb_queue_len(txq); 1280 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1281 tsk->oneway = 0; 1282 if (tsk->nagle_start < NAGLE_START_MAX) 1283 tsk->nagle_start *= 2; 1284 tsk->expect_ack = false; 1285 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1286 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1287 tsk->nagle_start); 1288 } else { 1289 tsk->nagle_start = NAGLE_START_INIT; 1290 if (skb) { 1291 msg_set_ack_required(buf_msg(skb)); 1292 tsk->expect_ack = true; 1293 } else { 1294 tsk->expect_ack = false; 1295 } 1296 } 1297 tsk->msg_acc = 0; 1298 tsk->pkt_cnt = 0; 1299 } 1300 1301 if (!skb || tsk->cong_link_cnt) 1302 return; 1303 1304 /* Do not send SYN again after congestion */ 1305 if (msg_is_syn(buf_msg(skb))) 1306 return; 1307 1308 if (tsk->msg_acc) 1309 tsk->pkt_cnt += skb_queue_len(txq); 1310 tsk->snt_unacked += tsk->snd_backlog; 1311 tsk->snd_backlog = 0; 1312 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1313 if (rc == -ELINKCONG) 1314 tsk->cong_link_cnt = 1; 1315 } 1316 1317 /** 1318 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1319 * @tsk: receiving socket 1320 * @skb: pointer to message buffer. 1321 * @inputq: buffer list containing the buffers 1322 * @xmitq: output message area 1323 */ 1324 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1325 struct sk_buff_head *inputq, 1326 struct sk_buff_head *xmitq) 1327 { 1328 struct tipc_msg *hdr = buf_msg(skb); 1329 u32 onode = tsk_own_node(tsk); 1330 struct sock *sk = &tsk->sk; 1331 int mtyp = msg_type(hdr); 1332 bool was_cong; 1333 1334 /* Ignore if connection cannot be validated: */ 1335 if (!tsk_peer_msg(tsk, hdr)) { 1336 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1337 goto exit; 1338 } 1339 1340 if (unlikely(msg_errcode(hdr))) { 1341 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1342 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1343 tsk_peer_port(tsk)); 1344 sk->sk_state_change(sk); 1345 1346 /* State change is ignored if socket already awake, 1347 * - convert msg to abort msg and add to inqueue 1348 */ 1349 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1350 msg_set_type(hdr, TIPC_CONN_MSG); 1351 msg_set_size(hdr, BASIC_H_SIZE); 1352 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1353 __skb_queue_tail(inputq, skb); 1354 return; 1355 } 1356 1357 tsk->probe_unacked = false; 1358 1359 if (mtyp == CONN_PROBE) { 1360 msg_set_type(hdr, CONN_PROBE_REPLY); 1361 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1362 __skb_queue_tail(xmitq, skb); 1363 return; 1364 } else if (mtyp == CONN_ACK) { 1365 was_cong = tsk_conn_cong(tsk); 1366 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1367 tsk->snt_unacked -= msg_conn_ack(hdr); 1368 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1369 tsk->snd_win = msg_adv_win(hdr); 1370 if (was_cong && !tsk_conn_cong(tsk)) 1371 sk->sk_write_space(sk); 1372 } else if (mtyp != CONN_PROBE_REPLY) { 1373 pr_warn("Received unknown CONN_PROTO msg\n"); 1374 } 1375 exit: 1376 kfree_skb(skb); 1377 } 1378 1379 /** 1380 * tipc_sendmsg - send message in connectionless manner 1381 * @sock: socket structure 1382 * @m: message to send 1383 * @dsz: amount of user data to be sent 1384 * 1385 * Message must have an destination specified explicitly. 1386 * Used for SOCK_RDM and SOCK_DGRAM messages, 1387 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1388 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1389 * 1390 * Return: the number of bytes sent on success, or errno otherwise 1391 */ 1392 static int tipc_sendmsg(struct socket *sock, 1393 struct msghdr *m, size_t dsz) 1394 { 1395 struct sock *sk = sock->sk; 1396 int ret; 1397 1398 lock_sock(sk); 1399 ret = __tipc_sendmsg(sock, m, dsz); 1400 release_sock(sk); 1401 1402 return ret; 1403 } 1404 1405 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1406 { 1407 struct sock *sk = sock->sk; 1408 struct net *net = sock_net(sk); 1409 struct tipc_sock *tsk = tipc_sk(sk); 1410 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1411 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1412 struct list_head *clinks = &tsk->cong_links; 1413 bool syn = !tipc_sk_type_connectionless(sk); 1414 struct tipc_group *grp = tsk->group; 1415 struct tipc_msg *hdr = &tsk->phdr; 1416 struct tipc_socket_addr skaddr; 1417 struct sk_buff_head pkts; 1418 int atype, mtu, rc; 1419 1420 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1421 return -EMSGSIZE; 1422 1423 if (ua) { 1424 if (!tipc_uaddr_valid(ua, m->msg_namelen)) 1425 return -EINVAL; 1426 atype = ua->addrtype; 1427 } 1428 1429 /* If socket belongs to a communication group follow other paths */ 1430 if (grp) { 1431 if (!ua) 1432 return tipc_send_group_bcast(sock, m, dlen, timeout); 1433 if (atype == TIPC_SERVICE_ADDR) 1434 return tipc_send_group_anycast(sock, m, dlen, timeout); 1435 if (atype == TIPC_SOCKET_ADDR) 1436 return tipc_send_group_unicast(sock, m, dlen, timeout); 1437 if (atype == TIPC_SERVICE_RANGE) 1438 return tipc_send_group_mcast(sock, m, dlen, timeout); 1439 return -EINVAL; 1440 } 1441 1442 if (!ua) { 1443 ua = (struct tipc_uaddr *)&tsk->peer; 1444 if (!syn && ua->family != AF_TIPC) 1445 return -EDESTADDRREQ; 1446 atype = ua->addrtype; 1447 } 1448 1449 if (unlikely(syn)) { 1450 if (sk->sk_state == TIPC_LISTEN) 1451 return -EPIPE; 1452 if (sk->sk_state != TIPC_OPEN) 1453 return -EISCONN; 1454 if (tsk->published) 1455 return -EOPNOTSUPP; 1456 if (atype == TIPC_SERVICE_ADDR) 1457 tsk->conn_addrtype = atype; 1458 msg_set_syn(hdr, 1); 1459 } 1460 1461 memset(&skaddr, 0, sizeof(skaddr)); 1462 1463 /* Determine destination */ 1464 if (atype == TIPC_SERVICE_RANGE) { 1465 return tipc_sendmcast(sock, ua, m, dlen, timeout); 1466 } else if (atype == TIPC_SERVICE_ADDR) { 1467 skaddr.node = ua->lookup_node; 1468 ua->scope = tipc_node2scope(skaddr.node); 1469 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr)) 1470 return -EHOSTUNREACH; 1471 } else if (atype == TIPC_SOCKET_ADDR) { 1472 skaddr = ua->sk; 1473 } else { 1474 return -EINVAL; 1475 } 1476 1477 /* Block or return if destination link is congested */ 1478 rc = tipc_wait_for_cond(sock, &timeout, 1479 !tipc_dest_find(clinks, skaddr.node, 0)); 1480 if (unlikely(rc)) 1481 return rc; 1482 1483 /* Finally build message header */ 1484 msg_set_destnode(hdr, skaddr.node); 1485 msg_set_destport(hdr, skaddr.ref); 1486 if (atype == TIPC_SERVICE_ADDR) { 1487 msg_set_type(hdr, TIPC_NAMED_MSG); 1488 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1489 msg_set_nametype(hdr, ua->sa.type); 1490 msg_set_nameinst(hdr, ua->sa.instance); 1491 msg_set_lookup_scope(hdr, ua->scope); 1492 } else { /* TIPC_SOCKET_ADDR */ 1493 msg_set_type(hdr, TIPC_DIRECT_MSG); 1494 msg_set_lookup_scope(hdr, 0); 1495 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1496 } 1497 1498 /* Add message body */ 1499 __skb_queue_head_init(&pkts); 1500 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true); 1501 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1502 if (unlikely(rc != dlen)) 1503 return rc; 1504 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1505 __skb_queue_purge(&pkts); 1506 return -ENOMEM; 1507 } 1508 1509 /* Send message */ 1510 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1511 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid); 1512 if (unlikely(rc == -ELINKCONG)) { 1513 tipc_dest_push(clinks, skaddr.node, 0); 1514 tsk->cong_link_cnt++; 1515 rc = 0; 1516 } 1517 1518 if (unlikely(syn && !rc)) { 1519 tipc_set_sk_state(sk, TIPC_CONNECTING); 1520 if (dlen && timeout) { 1521 timeout = msecs_to_jiffies(timeout); 1522 tipc_wait_for_connect(sock, &timeout); 1523 } 1524 } 1525 1526 return rc ? rc : dlen; 1527 } 1528 1529 /** 1530 * tipc_sendstream - send stream-oriented data 1531 * @sock: socket structure 1532 * @m: data to send 1533 * @dsz: total length of data to be transmitted 1534 * 1535 * Used for SOCK_STREAM data. 1536 * 1537 * Return: the number of bytes sent on success (or partial success), 1538 * or errno if no data sent 1539 */ 1540 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1541 { 1542 struct sock *sk = sock->sk; 1543 int ret; 1544 1545 lock_sock(sk); 1546 ret = __tipc_sendstream(sock, m, dsz); 1547 release_sock(sk); 1548 1549 return ret; 1550 } 1551 1552 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1553 { 1554 struct sock *sk = sock->sk; 1555 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1556 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1557 struct sk_buff_head *txq = &sk->sk_write_queue; 1558 struct tipc_sock *tsk = tipc_sk(sk); 1559 struct tipc_msg *hdr = &tsk->phdr; 1560 struct net *net = sock_net(sk); 1561 struct sk_buff *skb; 1562 u32 dnode = tsk_peer_node(tsk); 1563 int maxnagle = tsk->maxnagle; 1564 int maxpkt = tsk->max_pkt; 1565 int send, sent = 0; 1566 int blocks, rc = 0; 1567 1568 if (unlikely(dlen > INT_MAX)) 1569 return -EMSGSIZE; 1570 1571 /* Handle implicit connection setup */ 1572 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) { 1573 rc = __tipc_sendmsg(sock, m, dlen); 1574 if (dlen && dlen == rc) { 1575 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1576 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1577 } 1578 return rc; 1579 } 1580 1581 do { 1582 rc = tipc_wait_for_cond(sock, &timeout, 1583 (!tsk->cong_link_cnt && 1584 !tsk_conn_cong(tsk) && 1585 tipc_sk_connected(sk))); 1586 if (unlikely(rc)) 1587 break; 1588 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1589 blocks = tsk->snd_backlog; 1590 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1591 send <= maxnagle) { 1592 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1593 if (unlikely(rc < 0)) 1594 break; 1595 blocks += rc; 1596 tsk->msg_acc++; 1597 if (blocks <= 64 && tsk->expect_ack) { 1598 tsk->snd_backlog = blocks; 1599 sent += send; 1600 break; 1601 } else if (blocks > 64) { 1602 tsk->pkt_cnt += skb_queue_len(txq); 1603 } else { 1604 skb = skb_peek_tail(txq); 1605 if (skb) { 1606 msg_set_ack_required(buf_msg(skb)); 1607 tsk->expect_ack = true; 1608 } else { 1609 tsk->expect_ack = false; 1610 } 1611 tsk->msg_acc = 0; 1612 tsk->pkt_cnt = 0; 1613 } 1614 } else { 1615 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1616 if (unlikely(rc != send)) 1617 break; 1618 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1619 } 1620 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1621 TIPC_DUMP_SK_SNDQ, " "); 1622 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1623 if (unlikely(rc == -ELINKCONG)) { 1624 tsk->cong_link_cnt = 1; 1625 rc = 0; 1626 } 1627 if (likely(!rc)) { 1628 tsk->snt_unacked += blocks; 1629 tsk->snd_backlog = 0; 1630 sent += send; 1631 } 1632 } while (sent < dlen && !rc); 1633 1634 return sent ? sent : rc; 1635 } 1636 1637 /** 1638 * tipc_send_packet - send a connection-oriented message 1639 * @sock: socket structure 1640 * @m: message to send 1641 * @dsz: length of data to be transmitted 1642 * 1643 * Used for SOCK_SEQPACKET messages. 1644 * 1645 * Return: the number of bytes sent on success, or errno otherwise 1646 */ 1647 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1648 { 1649 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1650 return -EMSGSIZE; 1651 1652 return tipc_sendstream(sock, m, dsz); 1653 } 1654 1655 /* tipc_sk_finish_conn - complete the setup of a connection 1656 */ 1657 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1658 u32 peer_node) 1659 { 1660 struct sock *sk = &tsk->sk; 1661 struct net *net = sock_net(sk); 1662 struct tipc_msg *msg = &tsk->phdr; 1663 1664 msg_set_syn(msg, 0); 1665 msg_set_destnode(msg, peer_node); 1666 msg_set_destport(msg, peer_port); 1667 msg_set_type(msg, TIPC_CONN_MSG); 1668 msg_set_lookup_scope(msg, 0); 1669 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1670 1671 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1672 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1673 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1674 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1675 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1676 tsk_set_nagle(tsk); 1677 __skb_queue_purge(&sk->sk_write_queue); 1678 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1679 return; 1680 1681 /* Fall back to message based flow control */ 1682 tsk->rcv_win = FLOWCTL_MSG_WIN; 1683 tsk->snd_win = FLOWCTL_MSG_WIN; 1684 } 1685 1686 /** 1687 * tipc_sk_set_orig_addr - capture sender's address for received message 1688 * @m: descriptor for message info 1689 * @skb: received message 1690 * 1691 * Note: Address is not captured if not requested by receiver. 1692 */ 1693 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1694 { 1695 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1696 struct tipc_msg *hdr = buf_msg(skb); 1697 1698 if (!srcaddr) 1699 return; 1700 1701 srcaddr->sock.family = AF_TIPC; 1702 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR; 1703 srcaddr->sock.scope = 0; 1704 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1705 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1706 srcaddr->sock.addr.name.domain = 0; 1707 m->msg_namelen = sizeof(struct sockaddr_tipc); 1708 1709 if (!msg_in_group(hdr)) 1710 return; 1711 1712 /* Group message users may also want to know sending member's id */ 1713 srcaddr->member.family = AF_TIPC; 1714 srcaddr->member.addrtype = TIPC_SERVICE_ADDR; 1715 srcaddr->member.scope = 0; 1716 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1717 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1718 srcaddr->member.addr.name.domain = 0; 1719 m->msg_namelen = sizeof(*srcaddr); 1720 } 1721 1722 /** 1723 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1724 * @m: descriptor for message info 1725 * @skb: received message buffer 1726 * @tsk: TIPC port associated with message 1727 * 1728 * Note: Ancillary data is not captured if not requested by receiver. 1729 * 1730 * Return: 0 if successful, otherwise errno 1731 */ 1732 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1733 struct tipc_sock *tsk) 1734 { 1735 struct tipc_msg *hdr; 1736 u32 data[3] = {0,}; 1737 bool has_addr; 1738 int dlen, rc; 1739 1740 if (likely(m->msg_controllen == 0)) 1741 return 0; 1742 1743 hdr = buf_msg(skb); 1744 dlen = msg_data_sz(hdr); 1745 1746 /* Capture errored message object, if any */ 1747 if (msg_errcode(hdr)) { 1748 if (skb_linearize(skb)) 1749 return -ENOMEM; 1750 hdr = buf_msg(skb); 1751 data[0] = msg_errcode(hdr); 1752 data[1] = dlen; 1753 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data); 1754 if (rc || !dlen) 1755 return rc; 1756 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr)); 1757 if (rc) 1758 return rc; 1759 } 1760 1761 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */ 1762 switch (msg_type(hdr)) { 1763 case TIPC_NAMED_MSG: 1764 has_addr = true; 1765 data[0] = msg_nametype(hdr); 1766 data[1] = msg_namelower(hdr); 1767 data[2] = data[1]; 1768 break; 1769 case TIPC_MCAST_MSG: 1770 has_addr = true; 1771 data[0] = msg_nametype(hdr); 1772 data[1] = msg_namelower(hdr); 1773 data[2] = msg_nameupper(hdr); 1774 break; 1775 case TIPC_CONN_MSG: 1776 has_addr = !!tsk->conn_addrtype; 1777 data[0] = msg_nametype(&tsk->phdr); 1778 data[1] = msg_nameinst(&tsk->phdr); 1779 data[2] = data[1]; 1780 break; 1781 default: 1782 has_addr = false; 1783 } 1784 if (!has_addr) 1785 return 0; 1786 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data); 1787 } 1788 1789 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1790 { 1791 struct sock *sk = &tsk->sk; 1792 struct sk_buff *skb = NULL; 1793 struct tipc_msg *msg; 1794 u32 peer_port = tsk_peer_port(tsk); 1795 u32 dnode = tsk_peer_node(tsk); 1796 1797 if (!tipc_sk_connected(sk)) 1798 return NULL; 1799 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1800 dnode, tsk_own_node(tsk), peer_port, 1801 tsk->portid, TIPC_OK); 1802 if (!skb) 1803 return NULL; 1804 msg = buf_msg(skb); 1805 msg_set_conn_ack(msg, tsk->rcv_unacked); 1806 tsk->rcv_unacked = 0; 1807 1808 /* Adjust to and advertize the correct window limit */ 1809 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1810 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1811 msg_set_adv_win(msg, tsk->rcv_win); 1812 } 1813 return skb; 1814 } 1815 1816 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1817 { 1818 struct sk_buff *skb; 1819 1820 skb = tipc_sk_build_ack(tsk); 1821 if (!skb) 1822 return; 1823 1824 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1825 msg_link_selector(buf_msg(skb))); 1826 } 1827 1828 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1829 { 1830 struct sock *sk = sock->sk; 1831 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1832 long timeo = *timeop; 1833 int err = sock_error(sk); 1834 1835 if (err) 1836 return err; 1837 1838 for (;;) { 1839 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1840 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1841 err = -ENOTCONN; 1842 break; 1843 } 1844 add_wait_queue(sk_sleep(sk), &wait); 1845 release_sock(sk); 1846 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1847 sched_annotate_sleep(); 1848 lock_sock(sk); 1849 remove_wait_queue(sk_sleep(sk), &wait); 1850 } 1851 err = 0; 1852 if (!skb_queue_empty(&sk->sk_receive_queue)) 1853 break; 1854 err = -EAGAIN; 1855 if (!timeo) 1856 break; 1857 err = sock_intr_errno(timeo); 1858 if (signal_pending(current)) 1859 break; 1860 1861 err = sock_error(sk); 1862 if (err) 1863 break; 1864 } 1865 *timeop = timeo; 1866 return err; 1867 } 1868 1869 /** 1870 * tipc_recvmsg - receive packet-oriented message 1871 * @sock: network socket 1872 * @m: descriptor for message info 1873 * @buflen: length of user buffer area 1874 * @flags: receive flags 1875 * 1876 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1877 * If the complete message doesn't fit in user area, truncate it. 1878 * 1879 * Return: size of returned message data, errno otherwise 1880 */ 1881 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1882 size_t buflen, int flags) 1883 { 1884 struct sock *sk = sock->sk; 1885 bool connected = !tipc_sk_type_connectionless(sk); 1886 struct tipc_sock *tsk = tipc_sk(sk); 1887 int rc, err, hlen, dlen, copy; 1888 struct tipc_skb_cb *skb_cb; 1889 struct sk_buff_head xmitq; 1890 struct tipc_msg *hdr; 1891 struct sk_buff *skb; 1892 bool grp_evt; 1893 long timeout; 1894 1895 /* Catch invalid receive requests */ 1896 if (unlikely(!buflen)) 1897 return -EINVAL; 1898 1899 lock_sock(sk); 1900 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1901 rc = -ENOTCONN; 1902 goto exit; 1903 } 1904 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1905 1906 /* Step rcv queue to first msg with data or error; wait if necessary */ 1907 do { 1908 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1909 if (unlikely(rc)) 1910 goto exit; 1911 skb = skb_peek(&sk->sk_receive_queue); 1912 skb_cb = TIPC_SKB_CB(skb); 1913 hdr = buf_msg(skb); 1914 dlen = msg_data_sz(hdr); 1915 hlen = msg_hdr_sz(hdr); 1916 err = msg_errcode(hdr); 1917 grp_evt = msg_is_grp_evt(hdr); 1918 if (likely(dlen || err)) 1919 break; 1920 tsk_advance_rx_queue(sk); 1921 } while (1); 1922 1923 /* Collect msg meta data, including error code and rejected data */ 1924 tipc_sk_set_orig_addr(m, skb); 1925 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1926 if (unlikely(rc)) 1927 goto exit; 1928 hdr = buf_msg(skb); 1929 1930 /* Capture data if non-error msg, otherwise just set return value */ 1931 if (likely(!err)) { 1932 int offset = skb_cb->bytes_read; 1933 1934 copy = min_t(int, dlen - offset, buflen); 1935 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 1936 if (unlikely(rc)) 1937 goto exit; 1938 if (unlikely(offset + copy < dlen)) { 1939 if (flags & MSG_EOR) { 1940 if (!(flags & MSG_PEEK)) 1941 skb_cb->bytes_read = offset + copy; 1942 } else { 1943 m->msg_flags |= MSG_TRUNC; 1944 skb_cb->bytes_read = 0; 1945 } 1946 } else { 1947 if (flags & MSG_EOR) 1948 m->msg_flags |= MSG_EOR; 1949 skb_cb->bytes_read = 0; 1950 } 1951 } else { 1952 copy = 0; 1953 rc = 0; 1954 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) { 1955 rc = -ECONNRESET; 1956 goto exit; 1957 } 1958 } 1959 1960 /* Mark message as group event if applicable */ 1961 if (unlikely(grp_evt)) { 1962 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1963 m->msg_flags |= MSG_EOR; 1964 m->msg_flags |= MSG_OOB; 1965 copy = 0; 1966 } 1967 1968 /* Caption of data or error code/rejected data was successful */ 1969 if (unlikely(flags & MSG_PEEK)) 1970 goto exit; 1971 1972 /* Send group flow control advertisement when applicable */ 1973 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1974 __skb_queue_head_init(&xmitq); 1975 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1976 msg_orignode(hdr), msg_origport(hdr), 1977 &xmitq); 1978 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1979 } 1980 1981 if (skb_cb->bytes_read) 1982 goto exit; 1983 1984 tsk_advance_rx_queue(sk); 1985 1986 if (likely(!connected)) 1987 goto exit; 1988 1989 /* Send connection flow control advertisement when applicable */ 1990 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1991 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1992 tipc_sk_send_ack(tsk); 1993 exit: 1994 release_sock(sk); 1995 return rc ? rc : copy; 1996 } 1997 1998 /** 1999 * tipc_recvstream - receive stream-oriented data 2000 * @sock: network socket 2001 * @m: descriptor for message info 2002 * @buflen: total size of user buffer area 2003 * @flags: receive flags 2004 * 2005 * Used for SOCK_STREAM messages only. If not enough data is available 2006 * will optionally wait for more; never truncates data. 2007 * 2008 * Return: size of returned message data, errno otherwise 2009 */ 2010 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 2011 size_t buflen, int flags) 2012 { 2013 struct sock *sk = sock->sk; 2014 struct tipc_sock *tsk = tipc_sk(sk); 2015 struct sk_buff *skb; 2016 struct tipc_msg *hdr; 2017 struct tipc_skb_cb *skb_cb; 2018 bool peek = flags & MSG_PEEK; 2019 int offset, required, copy, copied = 0; 2020 int hlen, dlen, err, rc; 2021 long timeout; 2022 2023 /* Catch invalid receive attempts */ 2024 if (unlikely(!buflen)) 2025 return -EINVAL; 2026 2027 lock_sock(sk); 2028 2029 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2030 rc = -ENOTCONN; 2031 goto exit; 2032 } 2033 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2034 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2035 2036 do { 2037 /* Look at first msg in receive queue; wait if necessary */ 2038 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2039 if (unlikely(rc)) 2040 break; 2041 skb = skb_peek(&sk->sk_receive_queue); 2042 skb_cb = TIPC_SKB_CB(skb); 2043 hdr = buf_msg(skb); 2044 dlen = msg_data_sz(hdr); 2045 hlen = msg_hdr_sz(hdr); 2046 err = msg_errcode(hdr); 2047 2048 /* Discard any empty non-errored (SYN-) message */ 2049 if (unlikely(!dlen && !err)) { 2050 tsk_advance_rx_queue(sk); 2051 continue; 2052 } 2053 2054 /* Collect msg meta data, incl. error code and rejected data */ 2055 if (!copied) { 2056 tipc_sk_set_orig_addr(m, skb); 2057 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2058 if (rc) 2059 break; 2060 hdr = buf_msg(skb); 2061 } 2062 2063 /* Copy data if msg ok, otherwise return error/partial data */ 2064 if (likely(!err)) { 2065 offset = skb_cb->bytes_read; 2066 copy = min_t(int, dlen - offset, buflen - copied); 2067 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2068 if (unlikely(rc)) 2069 break; 2070 copied += copy; 2071 offset += copy; 2072 if (unlikely(offset < dlen)) { 2073 if (!peek) 2074 skb_cb->bytes_read = offset; 2075 break; 2076 } 2077 } else { 2078 rc = 0; 2079 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2080 rc = -ECONNRESET; 2081 if (copied || rc) 2082 break; 2083 } 2084 2085 if (unlikely(peek)) 2086 break; 2087 2088 tsk_advance_rx_queue(sk); 2089 2090 /* Send connection flow control advertisement when applicable */ 2091 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2092 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2093 tipc_sk_send_ack(tsk); 2094 2095 /* Exit if all requested data or FIN/error received */ 2096 if (copied == buflen || err) 2097 break; 2098 2099 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2100 exit: 2101 release_sock(sk); 2102 return copied ? copied : rc; 2103 } 2104 2105 /** 2106 * tipc_write_space - wake up thread if port congestion is released 2107 * @sk: socket 2108 */ 2109 static void tipc_write_space(struct sock *sk) 2110 { 2111 struct socket_wq *wq; 2112 2113 rcu_read_lock(); 2114 wq = rcu_dereference(sk->sk_wq); 2115 if (skwq_has_sleeper(wq)) 2116 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2117 EPOLLWRNORM | EPOLLWRBAND); 2118 rcu_read_unlock(); 2119 } 2120 2121 /** 2122 * tipc_data_ready - wake up threads to indicate messages have been received 2123 * @sk: socket 2124 */ 2125 static void tipc_data_ready(struct sock *sk) 2126 { 2127 struct socket_wq *wq; 2128 2129 trace_sk_data_ready(sk); 2130 2131 rcu_read_lock(); 2132 wq = rcu_dereference(sk->sk_wq); 2133 if (skwq_has_sleeper(wq)) 2134 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2135 EPOLLRDNORM | EPOLLRDBAND); 2136 rcu_read_unlock(); 2137 } 2138 2139 static void tipc_sock_destruct(struct sock *sk) 2140 { 2141 __skb_queue_purge(&sk->sk_receive_queue); 2142 } 2143 2144 static void tipc_sk_proto_rcv(struct sock *sk, 2145 struct sk_buff_head *inputq, 2146 struct sk_buff_head *xmitq) 2147 { 2148 struct sk_buff *skb = __skb_dequeue(inputq); 2149 struct tipc_sock *tsk = tipc_sk(sk); 2150 struct tipc_msg *hdr = buf_msg(skb); 2151 struct tipc_group *grp = tsk->group; 2152 bool wakeup = false; 2153 2154 switch (msg_user(hdr)) { 2155 case CONN_MANAGER: 2156 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2157 return; 2158 case SOCK_WAKEUP: 2159 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2160 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2161 smp_wmb(); 2162 tsk->cong_link_cnt--; 2163 wakeup = true; 2164 tipc_sk_push_backlog(tsk, false); 2165 break; 2166 case GROUP_PROTOCOL: 2167 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2168 break; 2169 case TOP_SRV: 2170 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2171 hdr, inputq, xmitq); 2172 break; 2173 default: 2174 break; 2175 } 2176 2177 if (wakeup) 2178 sk->sk_write_space(sk); 2179 2180 kfree_skb(skb); 2181 } 2182 2183 /** 2184 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2185 * @tsk: TIPC socket 2186 * @skb: pointer to message buffer. 2187 * @xmitq: for Nagle ACK if any 2188 * Return: true if message should be added to receive queue, false otherwise 2189 */ 2190 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2191 struct sk_buff_head *xmitq) 2192 { 2193 struct sock *sk = &tsk->sk; 2194 struct net *net = sock_net(sk); 2195 struct tipc_msg *hdr = buf_msg(skb); 2196 bool con_msg = msg_connected(hdr); 2197 u32 pport = tsk_peer_port(tsk); 2198 u32 pnode = tsk_peer_node(tsk); 2199 u32 oport = msg_origport(hdr); 2200 u32 onode = msg_orignode(hdr); 2201 int err = msg_errcode(hdr); 2202 unsigned long delay; 2203 2204 if (unlikely(msg_mcast(hdr))) 2205 return false; 2206 tsk->oneway = 0; 2207 2208 switch (sk->sk_state) { 2209 case TIPC_CONNECTING: 2210 /* Setup ACK */ 2211 if (likely(con_msg)) { 2212 if (err) 2213 break; 2214 tipc_sk_finish_conn(tsk, oport, onode); 2215 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2216 /* ACK+ message with data is added to receive queue */ 2217 if (msg_data_sz(hdr)) 2218 return true; 2219 /* Empty ACK-, - wake up sleeping connect() and drop */ 2220 sk->sk_state_change(sk); 2221 msg_set_dest_droppable(hdr, 1); 2222 return false; 2223 } 2224 /* Ignore connectionless message if not from listening socket */ 2225 if (oport != pport || onode != pnode) 2226 return false; 2227 2228 /* Rejected SYN */ 2229 if (err != TIPC_ERR_OVERLOAD) 2230 break; 2231 2232 /* Prepare for new setup attempt if we have a SYN clone */ 2233 if (skb_queue_empty(&sk->sk_write_queue)) 2234 break; 2235 get_random_bytes(&delay, 2); 2236 delay %= (tsk->conn_timeout / 4); 2237 delay = msecs_to_jiffies(delay + 100); 2238 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2239 return false; 2240 case TIPC_OPEN: 2241 case TIPC_DISCONNECTING: 2242 return false; 2243 case TIPC_LISTEN: 2244 /* Accept only SYN message */ 2245 if (!msg_is_syn(hdr) && 2246 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2247 return false; 2248 if (!con_msg && !err) 2249 return true; 2250 return false; 2251 case TIPC_ESTABLISHED: 2252 if (!skb_queue_empty(&sk->sk_write_queue)) 2253 tipc_sk_push_backlog(tsk, false); 2254 /* Accept only connection-based messages sent by peer */ 2255 if (likely(con_msg && !err && pport == oport && 2256 pnode == onode)) { 2257 if (msg_ack_required(hdr)) { 2258 struct sk_buff *skb; 2259 2260 skb = tipc_sk_build_ack(tsk); 2261 if (skb) { 2262 msg_set_nagle_ack(buf_msg(skb)); 2263 __skb_queue_tail(xmitq, skb); 2264 } 2265 } 2266 return true; 2267 } 2268 if (!tsk_peer_msg(tsk, hdr)) 2269 return false; 2270 if (!err) 2271 return true; 2272 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2273 tipc_node_remove_conn(net, pnode, tsk->portid); 2274 sk->sk_state_change(sk); 2275 return true; 2276 default: 2277 pr_err("Unknown sk_state %u\n", sk->sk_state); 2278 } 2279 /* Abort connection setup attempt */ 2280 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2281 sk->sk_err = ECONNREFUSED; 2282 sk->sk_state_change(sk); 2283 return true; 2284 } 2285 2286 /** 2287 * rcvbuf_limit - get proper overload limit of socket receive queue 2288 * @sk: socket 2289 * @skb: message 2290 * 2291 * For connection oriented messages, irrespective of importance, 2292 * default queue limit is 2 MB. 2293 * 2294 * For connectionless messages, queue limits are based on message 2295 * importance as follows: 2296 * 2297 * TIPC_LOW_IMPORTANCE (2 MB) 2298 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2299 * TIPC_HIGH_IMPORTANCE (8 MB) 2300 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2301 * 2302 * Return: overload limit according to corresponding message importance 2303 */ 2304 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2305 { 2306 struct tipc_sock *tsk = tipc_sk(sk); 2307 struct tipc_msg *hdr = buf_msg(skb); 2308 2309 if (unlikely(msg_in_group(hdr))) 2310 return READ_ONCE(sk->sk_rcvbuf); 2311 2312 if (unlikely(!msg_connected(hdr))) 2313 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2314 2315 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2316 return READ_ONCE(sk->sk_rcvbuf); 2317 2318 return FLOWCTL_MSG_LIM; 2319 } 2320 2321 /** 2322 * tipc_sk_filter_rcv - validate incoming message 2323 * @sk: socket 2324 * @skb: pointer to message. 2325 * @xmitq: output message area (FIXME) 2326 * 2327 * Enqueues message on receive queue if acceptable; optionally handles 2328 * disconnect indication for a connected socket. 2329 * 2330 * Called with socket lock already taken 2331 */ 2332 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2333 struct sk_buff_head *xmitq) 2334 { 2335 bool sk_conn = !tipc_sk_type_connectionless(sk); 2336 struct tipc_sock *tsk = tipc_sk(sk); 2337 struct tipc_group *grp = tsk->group; 2338 struct tipc_msg *hdr = buf_msg(skb); 2339 struct net *net = sock_net(sk); 2340 struct sk_buff_head inputq; 2341 int mtyp = msg_type(hdr); 2342 int limit, err = TIPC_OK; 2343 2344 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2345 TIPC_SKB_CB(skb)->bytes_read = 0; 2346 __skb_queue_head_init(&inputq); 2347 __skb_queue_tail(&inputq, skb); 2348 2349 if (unlikely(!msg_isdata(hdr))) 2350 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2351 2352 if (unlikely(grp)) 2353 tipc_group_filter_msg(grp, &inputq, xmitq); 2354 2355 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2356 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2357 2358 /* Validate and add to receive buffer if there is space */ 2359 while ((skb = __skb_dequeue(&inputq))) { 2360 hdr = buf_msg(skb); 2361 limit = rcvbuf_limit(sk, skb); 2362 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2363 (!sk_conn && msg_connected(hdr)) || 2364 (!grp && msg_in_group(hdr))) 2365 err = TIPC_ERR_NO_PORT; 2366 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2367 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2368 "err_overload2!"); 2369 atomic_inc(&sk->sk_drops); 2370 err = TIPC_ERR_OVERLOAD; 2371 } 2372 2373 if (unlikely(err)) { 2374 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2375 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2376 "@filter_rcv!"); 2377 __skb_queue_tail(xmitq, skb); 2378 } 2379 err = TIPC_OK; 2380 continue; 2381 } 2382 __skb_queue_tail(&sk->sk_receive_queue, skb); 2383 skb_set_owner_r(skb, sk); 2384 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2385 "rcvq >90% allocated!"); 2386 sk->sk_data_ready(sk); 2387 } 2388 } 2389 2390 /** 2391 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2392 * @sk: socket 2393 * @skb: message 2394 * 2395 * Caller must hold socket lock 2396 */ 2397 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2398 { 2399 unsigned int before = sk_rmem_alloc_get(sk); 2400 struct sk_buff_head xmitq; 2401 unsigned int added; 2402 2403 __skb_queue_head_init(&xmitq); 2404 2405 tipc_sk_filter_rcv(sk, skb, &xmitq); 2406 added = sk_rmem_alloc_get(sk) - before; 2407 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2408 2409 /* Send pending response/rejected messages, if any */ 2410 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2411 return 0; 2412 } 2413 2414 /** 2415 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2416 * inputq and try adding them to socket or backlog queue 2417 * @inputq: list of incoming buffers with potentially different destinations 2418 * @sk: socket where the buffers should be enqueued 2419 * @dport: port number for the socket 2420 * @xmitq: output queue 2421 * 2422 * Caller must hold socket lock 2423 */ 2424 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2425 u32 dport, struct sk_buff_head *xmitq) 2426 { 2427 unsigned long time_limit = jiffies + usecs_to_jiffies(20000); 2428 struct sk_buff *skb; 2429 unsigned int lim; 2430 atomic_t *dcnt; 2431 u32 onode; 2432 2433 while (skb_queue_len(inputq)) { 2434 if (unlikely(time_after_eq(jiffies, time_limit))) 2435 return; 2436 2437 skb = tipc_skb_dequeue(inputq, dport); 2438 if (unlikely(!skb)) 2439 return; 2440 2441 /* Add message directly to receive queue if possible */ 2442 if (!sock_owned_by_user(sk)) { 2443 tipc_sk_filter_rcv(sk, skb, xmitq); 2444 continue; 2445 } 2446 2447 /* Try backlog, compensating for double-counted bytes */ 2448 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2449 if (!sk->sk_backlog.len) 2450 atomic_set(dcnt, 0); 2451 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2452 if (likely(!sk_add_backlog(sk, skb, lim))) { 2453 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2454 "bklg & rcvq >90% allocated!"); 2455 continue; 2456 } 2457 2458 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2459 /* Overload => reject message back to sender */ 2460 onode = tipc_own_addr(sock_net(sk)); 2461 atomic_inc(&sk->sk_drops); 2462 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2463 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2464 "@sk_enqueue!"); 2465 __skb_queue_tail(xmitq, skb); 2466 } 2467 break; 2468 } 2469 } 2470 2471 /** 2472 * tipc_sk_rcv - handle a chain of incoming buffers 2473 * @net: the associated network namespace 2474 * @inputq: buffer list containing the buffers 2475 * Consumes all buffers in list until inputq is empty 2476 * Note: may be called in multiple threads referring to the same queue 2477 */ 2478 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2479 { 2480 struct sk_buff_head xmitq; 2481 u32 dnode, dport = 0; 2482 int err; 2483 struct tipc_sock *tsk; 2484 struct sock *sk; 2485 struct sk_buff *skb; 2486 2487 __skb_queue_head_init(&xmitq); 2488 while (skb_queue_len(inputq)) { 2489 dport = tipc_skb_peek_port(inputq, dport); 2490 tsk = tipc_sk_lookup(net, dport); 2491 2492 if (likely(tsk)) { 2493 sk = &tsk->sk; 2494 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2495 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2496 spin_unlock_bh(&sk->sk_lock.slock); 2497 } 2498 /* Send pending response/rejected messages, if any */ 2499 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2500 sock_put(sk); 2501 continue; 2502 } 2503 /* No destination socket => dequeue skb if still there */ 2504 skb = tipc_skb_dequeue(inputq, dport); 2505 if (!skb) 2506 return; 2507 2508 /* Try secondary lookup if unresolved named message */ 2509 err = TIPC_ERR_NO_PORT; 2510 if (tipc_msg_lookup_dest(net, skb, &err)) 2511 goto xmit; 2512 2513 /* Prepare for message rejection */ 2514 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2515 continue; 2516 2517 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2518 xmit: 2519 dnode = msg_destnode(buf_msg(skb)); 2520 tipc_node_xmit_skb(net, skb, dnode, dport); 2521 } 2522 } 2523 2524 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2525 { 2526 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2527 struct sock *sk = sock->sk; 2528 int done; 2529 2530 do { 2531 int err = sock_error(sk); 2532 if (err) 2533 return err; 2534 if (!*timeo_p) 2535 return -ETIMEDOUT; 2536 if (signal_pending(current)) 2537 return sock_intr_errno(*timeo_p); 2538 if (sk->sk_state == TIPC_DISCONNECTING) 2539 break; 2540 2541 add_wait_queue(sk_sleep(sk), &wait); 2542 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2543 &wait); 2544 remove_wait_queue(sk_sleep(sk), &wait); 2545 } while (!done); 2546 return 0; 2547 } 2548 2549 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2550 { 2551 if (addr->family != AF_TIPC) 2552 return false; 2553 if (addr->addrtype == TIPC_SERVICE_RANGE) 2554 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2555 return (addr->addrtype == TIPC_SERVICE_ADDR || 2556 addr->addrtype == TIPC_SOCKET_ADDR); 2557 } 2558 2559 /** 2560 * tipc_connect - establish a connection to another TIPC port 2561 * @sock: socket structure 2562 * @dest: socket address for destination port 2563 * @destlen: size of socket address data structure 2564 * @flags: file-related flags associated with socket 2565 * 2566 * Return: 0 on success, errno otherwise 2567 */ 2568 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2569 int destlen, int flags) 2570 { 2571 struct sock *sk = sock->sk; 2572 struct tipc_sock *tsk = tipc_sk(sk); 2573 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2574 struct msghdr m = {NULL,}; 2575 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2576 int previous; 2577 int res = 0; 2578 2579 if (destlen != sizeof(struct sockaddr_tipc)) 2580 return -EINVAL; 2581 2582 lock_sock(sk); 2583 2584 if (tsk->group) { 2585 res = -EINVAL; 2586 goto exit; 2587 } 2588 2589 if (dst->family == AF_UNSPEC) { 2590 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2591 if (!tipc_sk_type_connectionless(sk)) 2592 res = -EINVAL; 2593 goto exit; 2594 } 2595 if (!tipc_sockaddr_is_sane(dst)) { 2596 res = -EINVAL; 2597 goto exit; 2598 } 2599 /* DGRAM/RDM connect(), just save the destaddr */ 2600 if (tipc_sk_type_connectionless(sk)) { 2601 memcpy(&tsk->peer, dest, destlen); 2602 goto exit; 2603 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2604 res = -EINVAL; 2605 goto exit; 2606 } 2607 2608 previous = sk->sk_state; 2609 2610 switch (sk->sk_state) { 2611 case TIPC_OPEN: 2612 /* Send a 'SYN-' to destination */ 2613 m.msg_name = dest; 2614 m.msg_namelen = destlen; 2615 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0); 2616 2617 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2618 * indicate send_msg() is never blocked. 2619 */ 2620 if (!timeout) 2621 m.msg_flags = MSG_DONTWAIT; 2622 2623 res = __tipc_sendmsg(sock, &m, 0); 2624 if ((res < 0) && (res != -EWOULDBLOCK)) 2625 goto exit; 2626 2627 /* Just entered TIPC_CONNECTING state; the only 2628 * difference is that return value in non-blocking 2629 * case is EINPROGRESS, rather than EALREADY. 2630 */ 2631 res = -EINPROGRESS; 2632 fallthrough; 2633 case TIPC_CONNECTING: 2634 if (!timeout) { 2635 if (previous == TIPC_CONNECTING) 2636 res = -EALREADY; 2637 goto exit; 2638 } 2639 timeout = msecs_to_jiffies(timeout); 2640 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2641 res = tipc_wait_for_connect(sock, &timeout); 2642 break; 2643 case TIPC_ESTABLISHED: 2644 res = -EISCONN; 2645 break; 2646 default: 2647 res = -EINVAL; 2648 } 2649 2650 exit: 2651 release_sock(sk); 2652 return res; 2653 } 2654 2655 /** 2656 * tipc_listen - allow socket to listen for incoming connections 2657 * @sock: socket structure 2658 * @len: (unused) 2659 * 2660 * Return: 0 on success, errno otherwise 2661 */ 2662 static int tipc_listen(struct socket *sock, int len) 2663 { 2664 struct sock *sk = sock->sk; 2665 int res; 2666 2667 lock_sock(sk); 2668 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2669 release_sock(sk); 2670 2671 return res; 2672 } 2673 2674 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2675 { 2676 struct sock *sk = sock->sk; 2677 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2678 int err; 2679 2680 /* True wake-one mechanism for incoming connections: only 2681 * one process gets woken up, not the 'whole herd'. 2682 * Since we do not 'race & poll' for established sockets 2683 * anymore, the common case will execute the loop only once. 2684 */ 2685 for (;;) { 2686 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2687 add_wait_queue(sk_sleep(sk), &wait); 2688 release_sock(sk); 2689 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 2690 lock_sock(sk); 2691 remove_wait_queue(sk_sleep(sk), &wait); 2692 } 2693 err = 0; 2694 if (!skb_queue_empty(&sk->sk_receive_queue)) 2695 break; 2696 err = -EAGAIN; 2697 if (!timeo) 2698 break; 2699 err = sock_intr_errno(timeo); 2700 if (signal_pending(current)) 2701 break; 2702 } 2703 return err; 2704 } 2705 2706 /** 2707 * tipc_accept - wait for connection request 2708 * @sock: listening socket 2709 * @new_sock: new socket that is to be connected 2710 * @arg: arguments for accept 2711 * 2712 * Return: 0 on success, errno otherwise 2713 */ 2714 static int tipc_accept(struct socket *sock, struct socket *new_sock, 2715 struct proto_accept_arg *arg) 2716 { 2717 struct sock *new_sk, *sk = sock->sk; 2718 struct tipc_sock *new_tsock; 2719 struct msghdr m = {NULL,}; 2720 struct tipc_msg *msg; 2721 struct sk_buff *buf; 2722 long timeo; 2723 int res; 2724 2725 lock_sock(sk); 2726 2727 if (sk->sk_state != TIPC_LISTEN) { 2728 res = -EINVAL; 2729 goto exit; 2730 } 2731 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 2732 res = tipc_wait_for_accept(sock, timeo); 2733 if (res) 2734 goto exit; 2735 2736 buf = skb_peek(&sk->sk_receive_queue); 2737 2738 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, arg->kern); 2739 if (res) 2740 goto exit; 2741 security_sk_clone(sock->sk, new_sock->sk); 2742 2743 new_sk = new_sock->sk; 2744 new_tsock = tipc_sk(new_sk); 2745 msg = buf_msg(buf); 2746 2747 /* we lock on new_sk; but lockdep sees the lock on sk */ 2748 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2749 2750 /* 2751 * Reject any stray messages received by new socket 2752 * before the socket lock was taken (very, very unlikely) 2753 */ 2754 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2755 2756 /* Connect new socket to it's peer */ 2757 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2758 2759 tsk_set_importance(new_sk, msg_importance(msg)); 2760 if (msg_named(msg)) { 2761 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR; 2762 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg)); 2763 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg)); 2764 } 2765 2766 /* 2767 * Respond to 'SYN-' by discarding it & returning 'ACK'. 2768 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'. 2769 */ 2770 if (!msg_data_sz(msg)) { 2771 tsk_advance_rx_queue(sk); 2772 } else { 2773 __skb_dequeue(&sk->sk_receive_queue); 2774 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2775 skb_set_owner_r(buf, new_sk); 2776 } 2777 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0); 2778 __tipc_sendstream(new_sock, &m, 0); 2779 release_sock(new_sk); 2780 exit: 2781 release_sock(sk); 2782 return res; 2783 } 2784 2785 /** 2786 * tipc_shutdown - shutdown socket connection 2787 * @sock: socket structure 2788 * @how: direction to close (must be SHUT_RDWR) 2789 * 2790 * Terminates connection (if necessary), then purges socket's receive queue. 2791 * 2792 * Return: 0 on success, errno otherwise 2793 */ 2794 static int tipc_shutdown(struct socket *sock, int how) 2795 { 2796 struct sock *sk = sock->sk; 2797 int res; 2798 2799 if (how != SHUT_RDWR) 2800 return -EINVAL; 2801 2802 lock_sock(sk); 2803 2804 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2805 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2806 sk->sk_shutdown = SHUTDOWN_MASK; 2807 2808 if (sk->sk_state == TIPC_DISCONNECTING) { 2809 /* Discard any unreceived messages */ 2810 __skb_queue_purge(&sk->sk_receive_queue); 2811 2812 res = 0; 2813 } else { 2814 res = -ENOTCONN; 2815 } 2816 /* Wake up anyone sleeping in poll. */ 2817 sk->sk_state_change(sk); 2818 2819 release_sock(sk); 2820 return res; 2821 } 2822 2823 static void tipc_sk_check_probing_state(struct sock *sk, 2824 struct sk_buff_head *list) 2825 { 2826 struct tipc_sock *tsk = tipc_sk(sk); 2827 u32 pnode = tsk_peer_node(tsk); 2828 u32 pport = tsk_peer_port(tsk); 2829 u32 self = tsk_own_node(tsk); 2830 u32 oport = tsk->portid; 2831 struct sk_buff *skb; 2832 2833 if (tsk->probe_unacked) { 2834 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2835 sk->sk_err = ECONNABORTED; 2836 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2837 sk->sk_state_change(sk); 2838 return; 2839 } 2840 /* Prepare new probe */ 2841 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2842 pnode, self, pport, oport, TIPC_OK); 2843 if (skb) 2844 __skb_queue_tail(list, skb); 2845 tsk->probe_unacked = true; 2846 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2847 } 2848 2849 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2850 { 2851 struct tipc_sock *tsk = tipc_sk(sk); 2852 2853 /* Try again later if dest link is congested */ 2854 if (tsk->cong_link_cnt) { 2855 sk_reset_timer(sk, &sk->sk_timer, 2856 jiffies + msecs_to_jiffies(100)); 2857 return; 2858 } 2859 /* Prepare SYN for retransmit */ 2860 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2861 } 2862 2863 static void tipc_sk_timeout(struct timer_list *t) 2864 { 2865 struct sock *sk = from_timer(sk, t, sk_timer); 2866 struct tipc_sock *tsk = tipc_sk(sk); 2867 u32 pnode = tsk_peer_node(tsk); 2868 struct sk_buff_head list; 2869 int rc = 0; 2870 2871 __skb_queue_head_init(&list); 2872 bh_lock_sock(sk); 2873 2874 /* Try again later if socket is busy */ 2875 if (sock_owned_by_user(sk)) { 2876 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2877 bh_unlock_sock(sk); 2878 sock_put(sk); 2879 return; 2880 } 2881 2882 if (sk->sk_state == TIPC_ESTABLISHED) 2883 tipc_sk_check_probing_state(sk, &list); 2884 else if (sk->sk_state == TIPC_CONNECTING) 2885 tipc_sk_retry_connect(sk, &list); 2886 2887 bh_unlock_sock(sk); 2888 2889 if (!skb_queue_empty(&list)) 2890 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2891 2892 /* SYN messages may cause link congestion */ 2893 if (rc == -ELINKCONG) { 2894 tipc_dest_push(&tsk->cong_links, pnode, 0); 2895 tsk->cong_link_cnt = 1; 2896 } 2897 sock_put(sk); 2898 } 2899 2900 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2901 { 2902 struct sock *sk = &tsk->sk; 2903 struct net *net = sock_net(sk); 2904 struct tipc_socket_addr skaddr; 2905 struct publication *p; 2906 u32 key; 2907 2908 if (tipc_sk_connected(sk)) 2909 return -EINVAL; 2910 key = tsk->portid + tsk->pub_count + 1; 2911 if (key == tsk->portid) 2912 return -EADDRINUSE; 2913 skaddr.ref = tsk->portid; 2914 skaddr.node = tipc_own_addr(net); 2915 p = tipc_nametbl_publish(net, ua, &skaddr, key); 2916 if (unlikely(!p)) 2917 return -EINVAL; 2918 2919 list_add(&p->binding_sock, &tsk->publications); 2920 tsk->pub_count++; 2921 tsk->published = true; 2922 return 0; 2923 } 2924 2925 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2926 { 2927 struct net *net = sock_net(&tsk->sk); 2928 struct publication *safe, *p; 2929 struct tipc_uaddr _ua; 2930 int rc = -EINVAL; 2931 2932 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) { 2933 if (!ua) { 2934 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope, 2935 p->sr.type, p->sr.lower, p->sr.upper); 2936 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key); 2937 continue; 2938 } 2939 /* Unbind specific publication */ 2940 if (p->scope != ua->scope) 2941 continue; 2942 if (p->sr.type != ua->sr.type) 2943 continue; 2944 if (p->sr.lower != ua->sr.lower) 2945 continue; 2946 if (p->sr.upper != ua->sr.upper) 2947 break; 2948 tipc_nametbl_withdraw(net, ua, &p->sk, p->key); 2949 rc = 0; 2950 break; 2951 } 2952 if (list_empty(&tsk->publications)) { 2953 tsk->published = 0; 2954 rc = 0; 2955 } 2956 return rc; 2957 } 2958 2959 /* tipc_sk_reinit: set non-zero address in all existing sockets 2960 * when we go from standalone to network mode. 2961 */ 2962 void tipc_sk_reinit(struct net *net) 2963 { 2964 struct tipc_net *tn = net_generic(net, tipc_net_id); 2965 struct rhashtable_iter iter; 2966 struct tipc_sock *tsk; 2967 struct tipc_msg *msg; 2968 2969 rhashtable_walk_enter(&tn->sk_rht, &iter); 2970 2971 do { 2972 rhashtable_walk_start(&iter); 2973 2974 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2975 sock_hold(&tsk->sk); 2976 rhashtable_walk_stop(&iter); 2977 lock_sock(&tsk->sk); 2978 msg = &tsk->phdr; 2979 msg_set_prevnode(msg, tipc_own_addr(net)); 2980 msg_set_orignode(msg, tipc_own_addr(net)); 2981 release_sock(&tsk->sk); 2982 rhashtable_walk_start(&iter); 2983 sock_put(&tsk->sk); 2984 } 2985 2986 rhashtable_walk_stop(&iter); 2987 } while (tsk == ERR_PTR(-EAGAIN)); 2988 2989 rhashtable_walk_exit(&iter); 2990 } 2991 2992 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2993 { 2994 struct tipc_net *tn = net_generic(net, tipc_net_id); 2995 struct tipc_sock *tsk; 2996 2997 rcu_read_lock(); 2998 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 2999 if (tsk) 3000 sock_hold(&tsk->sk); 3001 rcu_read_unlock(); 3002 3003 return tsk; 3004 } 3005 3006 static int tipc_sk_insert(struct tipc_sock *tsk) 3007 { 3008 struct sock *sk = &tsk->sk; 3009 struct net *net = sock_net(sk); 3010 struct tipc_net *tn = net_generic(net, tipc_net_id); 3011 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 3012 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT; 3013 3014 while (remaining--) { 3015 portid++; 3016 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 3017 portid = TIPC_MIN_PORT; 3018 tsk->portid = portid; 3019 sock_hold(&tsk->sk); 3020 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 3021 tsk_rht_params)) 3022 return 0; 3023 sock_put(&tsk->sk); 3024 } 3025 3026 return -1; 3027 } 3028 3029 static void tipc_sk_remove(struct tipc_sock *tsk) 3030 { 3031 struct sock *sk = &tsk->sk; 3032 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3033 3034 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3035 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3036 __sock_put(sk); 3037 } 3038 } 3039 3040 static const struct rhashtable_params tsk_rht_params = { 3041 .nelem_hint = 192, 3042 .head_offset = offsetof(struct tipc_sock, node), 3043 .key_offset = offsetof(struct tipc_sock, portid), 3044 .key_len = sizeof(u32), /* portid */ 3045 .max_size = 1048576, 3046 .min_size = 256, 3047 .automatic_shrinking = true, 3048 }; 3049 3050 int tipc_sk_rht_init(struct net *net) 3051 { 3052 struct tipc_net *tn = net_generic(net, tipc_net_id); 3053 3054 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3055 } 3056 3057 void tipc_sk_rht_destroy(struct net *net) 3058 { 3059 struct tipc_net *tn = net_generic(net, tipc_net_id); 3060 3061 /* Wait for socket readers to complete */ 3062 synchronize_net(); 3063 3064 rhashtable_destroy(&tn->sk_rht); 3065 } 3066 3067 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3068 { 3069 struct net *net = sock_net(&tsk->sk); 3070 struct tipc_group *grp = tsk->group; 3071 struct tipc_msg *hdr = &tsk->phdr; 3072 struct tipc_uaddr ua; 3073 int rc; 3074 3075 if (mreq->type < TIPC_RESERVED_TYPES) 3076 return -EACCES; 3077 if (mreq->scope > TIPC_NODE_SCOPE) 3078 return -EINVAL; 3079 if (mreq->scope != TIPC_NODE_SCOPE) 3080 mreq->scope = TIPC_CLUSTER_SCOPE; 3081 if (grp) 3082 return -EACCES; 3083 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3084 if (!grp) 3085 return -ENOMEM; 3086 tsk->group = grp; 3087 msg_set_lookup_scope(hdr, mreq->scope); 3088 msg_set_nametype(hdr, mreq->type); 3089 msg_set_dest_droppable(hdr, true); 3090 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope, 3091 mreq->type, mreq->instance, mreq->instance); 3092 tipc_nametbl_build_group(net, grp, &ua); 3093 rc = tipc_sk_publish(tsk, &ua); 3094 if (rc) { 3095 tipc_group_delete(net, grp); 3096 tsk->group = NULL; 3097 return rc; 3098 } 3099 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3100 tsk->mc_method.rcast = true; 3101 tsk->mc_method.mandatory = true; 3102 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3103 return rc; 3104 } 3105 3106 static int tipc_sk_leave(struct tipc_sock *tsk) 3107 { 3108 struct net *net = sock_net(&tsk->sk); 3109 struct tipc_group *grp = tsk->group; 3110 struct tipc_uaddr ua; 3111 int scope; 3112 3113 if (!grp) 3114 return -EINVAL; 3115 ua.addrtype = TIPC_SERVICE_RANGE; 3116 tipc_group_self(grp, &ua.sr, &scope); 3117 ua.scope = scope; 3118 tipc_group_delete(net, grp); 3119 tsk->group = NULL; 3120 tipc_sk_withdraw(tsk, &ua); 3121 return 0; 3122 } 3123 3124 /** 3125 * tipc_setsockopt - set socket option 3126 * @sock: socket structure 3127 * @lvl: option level 3128 * @opt: option identifier 3129 * @ov: pointer to new option value 3130 * @ol: length of option value 3131 * 3132 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3133 * (to ease compatibility). 3134 * 3135 * Return: 0 on success, errno otherwise 3136 */ 3137 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3138 sockptr_t ov, unsigned int ol) 3139 { 3140 struct sock *sk = sock->sk; 3141 struct tipc_sock *tsk = tipc_sk(sk); 3142 struct tipc_group_req mreq; 3143 u32 value = 0; 3144 int res = 0; 3145 3146 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3147 return 0; 3148 if (lvl != SOL_TIPC) 3149 return -ENOPROTOOPT; 3150 3151 switch (opt) { 3152 case TIPC_IMPORTANCE: 3153 case TIPC_SRC_DROPPABLE: 3154 case TIPC_DEST_DROPPABLE: 3155 case TIPC_CONN_TIMEOUT: 3156 case TIPC_NODELAY: 3157 if (ol < sizeof(value)) 3158 return -EINVAL; 3159 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3160 return -EFAULT; 3161 break; 3162 case TIPC_GROUP_JOIN: 3163 if (ol < sizeof(mreq)) 3164 return -EINVAL; 3165 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3166 return -EFAULT; 3167 break; 3168 default: 3169 if (!sockptr_is_null(ov) || ol) 3170 return -EINVAL; 3171 } 3172 3173 lock_sock(sk); 3174 3175 switch (opt) { 3176 case TIPC_IMPORTANCE: 3177 res = tsk_set_importance(sk, value); 3178 break; 3179 case TIPC_SRC_DROPPABLE: 3180 if (sock->type != SOCK_STREAM) 3181 tsk_set_unreliable(tsk, value); 3182 else 3183 res = -ENOPROTOOPT; 3184 break; 3185 case TIPC_DEST_DROPPABLE: 3186 tsk_set_unreturnable(tsk, value); 3187 break; 3188 case TIPC_CONN_TIMEOUT: 3189 tipc_sk(sk)->conn_timeout = value; 3190 break; 3191 case TIPC_MCAST_BROADCAST: 3192 tsk->mc_method.rcast = false; 3193 tsk->mc_method.mandatory = true; 3194 break; 3195 case TIPC_MCAST_REPLICAST: 3196 tsk->mc_method.rcast = true; 3197 tsk->mc_method.mandatory = true; 3198 break; 3199 case TIPC_GROUP_JOIN: 3200 res = tipc_sk_join(tsk, &mreq); 3201 break; 3202 case TIPC_GROUP_LEAVE: 3203 res = tipc_sk_leave(tsk); 3204 break; 3205 case TIPC_NODELAY: 3206 tsk->nodelay = !!value; 3207 tsk_set_nagle(tsk); 3208 break; 3209 default: 3210 res = -EINVAL; 3211 } 3212 3213 release_sock(sk); 3214 3215 return res; 3216 } 3217 3218 /** 3219 * tipc_getsockopt - get socket option 3220 * @sock: socket structure 3221 * @lvl: option level 3222 * @opt: option identifier 3223 * @ov: receptacle for option value 3224 * @ol: receptacle for length of option value 3225 * 3226 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3227 * (to ease compatibility). 3228 * 3229 * Return: 0 on success, errno otherwise 3230 */ 3231 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3232 char __user *ov, int __user *ol) 3233 { 3234 struct sock *sk = sock->sk; 3235 struct tipc_sock *tsk = tipc_sk(sk); 3236 struct tipc_service_range seq; 3237 int len, scope; 3238 u32 value; 3239 int res; 3240 3241 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3242 return put_user(0, ol); 3243 if (lvl != SOL_TIPC) 3244 return -ENOPROTOOPT; 3245 res = get_user(len, ol); 3246 if (res) 3247 return res; 3248 3249 lock_sock(sk); 3250 3251 switch (opt) { 3252 case TIPC_IMPORTANCE: 3253 value = tsk_importance(tsk); 3254 break; 3255 case TIPC_SRC_DROPPABLE: 3256 value = tsk_unreliable(tsk); 3257 break; 3258 case TIPC_DEST_DROPPABLE: 3259 value = tsk_unreturnable(tsk); 3260 break; 3261 case TIPC_CONN_TIMEOUT: 3262 value = tsk->conn_timeout; 3263 /* no need to set "res", since already 0 at this point */ 3264 break; 3265 case TIPC_NODE_RECVQ_DEPTH: 3266 value = 0; /* was tipc_queue_size, now obsolete */ 3267 break; 3268 case TIPC_SOCK_RECVQ_DEPTH: 3269 value = skb_queue_len(&sk->sk_receive_queue); 3270 break; 3271 case TIPC_SOCK_RECVQ_USED: 3272 value = sk_rmem_alloc_get(sk); 3273 break; 3274 case TIPC_GROUP_JOIN: 3275 seq.type = 0; 3276 if (tsk->group) 3277 tipc_group_self(tsk->group, &seq, &scope); 3278 value = seq.type; 3279 break; 3280 default: 3281 res = -EINVAL; 3282 } 3283 3284 release_sock(sk); 3285 3286 if (res) 3287 return res; /* "get" failed */ 3288 3289 if (len < sizeof(value)) 3290 return -EINVAL; 3291 3292 if (copy_to_user(ov, &value, sizeof(value))) 3293 return -EFAULT; 3294 3295 return put_user(sizeof(value), ol); 3296 } 3297 3298 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3299 { 3300 struct net *net = sock_net(sock->sk); 3301 struct tipc_sioc_nodeid_req nr = {0}; 3302 struct tipc_sioc_ln_req lnr; 3303 void __user *argp = (void __user *)arg; 3304 3305 switch (cmd) { 3306 case SIOCGETLINKNAME: 3307 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3308 return -EFAULT; 3309 if (!tipc_node_get_linkname(net, 3310 lnr.bearer_id & 0xffff, lnr.peer, 3311 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3312 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3313 return -EFAULT; 3314 return 0; 3315 } 3316 return -EADDRNOTAVAIL; 3317 case SIOCGETNODEID: 3318 if (copy_from_user(&nr, argp, sizeof(nr))) 3319 return -EFAULT; 3320 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3321 return -EADDRNOTAVAIL; 3322 if (copy_to_user(argp, &nr, sizeof(nr))) 3323 return -EFAULT; 3324 return 0; 3325 default: 3326 return -ENOIOCTLCMD; 3327 } 3328 } 3329 3330 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3331 { 3332 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3333 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3334 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3335 3336 tsk1->peer.family = AF_TIPC; 3337 tsk1->peer.addrtype = TIPC_SOCKET_ADDR; 3338 tsk1->peer.scope = TIPC_NODE_SCOPE; 3339 tsk1->peer.addr.id.ref = tsk2->portid; 3340 tsk1->peer.addr.id.node = onode; 3341 tsk2->peer.family = AF_TIPC; 3342 tsk2->peer.addrtype = TIPC_SOCKET_ADDR; 3343 tsk2->peer.scope = TIPC_NODE_SCOPE; 3344 tsk2->peer.addr.id.ref = tsk1->portid; 3345 tsk2->peer.addr.id.node = onode; 3346 3347 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3348 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3349 return 0; 3350 } 3351 3352 /* Protocol switches for the various types of TIPC sockets */ 3353 3354 static const struct proto_ops msg_ops = { 3355 .owner = THIS_MODULE, 3356 .family = AF_TIPC, 3357 .release = tipc_release, 3358 .bind = tipc_bind, 3359 .connect = tipc_connect, 3360 .socketpair = tipc_socketpair, 3361 .accept = sock_no_accept, 3362 .getname = tipc_getname, 3363 .poll = tipc_poll, 3364 .ioctl = tipc_ioctl, 3365 .listen = sock_no_listen, 3366 .shutdown = tipc_shutdown, 3367 .setsockopt = tipc_setsockopt, 3368 .getsockopt = tipc_getsockopt, 3369 .sendmsg = tipc_sendmsg, 3370 .recvmsg = tipc_recvmsg, 3371 .mmap = sock_no_mmap, 3372 }; 3373 3374 static const struct proto_ops packet_ops = { 3375 .owner = THIS_MODULE, 3376 .family = AF_TIPC, 3377 .release = tipc_release, 3378 .bind = tipc_bind, 3379 .connect = tipc_connect, 3380 .socketpair = tipc_socketpair, 3381 .accept = tipc_accept, 3382 .getname = tipc_getname, 3383 .poll = tipc_poll, 3384 .ioctl = tipc_ioctl, 3385 .listen = tipc_listen, 3386 .shutdown = tipc_shutdown, 3387 .setsockopt = tipc_setsockopt, 3388 .getsockopt = tipc_getsockopt, 3389 .sendmsg = tipc_send_packet, 3390 .recvmsg = tipc_recvmsg, 3391 .mmap = sock_no_mmap, 3392 }; 3393 3394 static const struct proto_ops stream_ops = { 3395 .owner = THIS_MODULE, 3396 .family = AF_TIPC, 3397 .release = tipc_release, 3398 .bind = tipc_bind, 3399 .connect = tipc_connect, 3400 .socketpair = tipc_socketpair, 3401 .accept = tipc_accept, 3402 .getname = tipc_getname, 3403 .poll = tipc_poll, 3404 .ioctl = tipc_ioctl, 3405 .listen = tipc_listen, 3406 .shutdown = tipc_shutdown, 3407 .setsockopt = tipc_setsockopt, 3408 .getsockopt = tipc_getsockopt, 3409 .sendmsg = tipc_sendstream, 3410 .recvmsg = tipc_recvstream, 3411 .mmap = sock_no_mmap, 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 if (PTR_ERR(tsk) == -EAGAIN) 3564 continue; 3565 break; 3566 } 3567 3568 sock_hold(&tsk->sk); 3569 rhashtable_walk_stop(iter); 3570 lock_sock(&tsk->sk); 3571 err = skb_handler(skb, cb, tsk); 3572 if (err) { 3573 release_sock(&tsk->sk); 3574 sock_put(&tsk->sk); 3575 goto out; 3576 } 3577 release_sock(&tsk->sk); 3578 rhashtable_walk_start(iter); 3579 sock_put(&tsk->sk); 3580 } 3581 rhashtable_walk_stop(iter); 3582 out: 3583 return skb->len; 3584 } 3585 EXPORT_SYMBOL(tipc_nl_sk_walk); 3586 3587 int tipc_dump_start(struct netlink_callback *cb) 3588 { 3589 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3590 } 3591 EXPORT_SYMBOL(tipc_dump_start); 3592 3593 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3594 { 3595 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3596 struct rhashtable_iter *iter = (void *)cb->args[4]; 3597 struct tipc_net *tn = tipc_net(net); 3598 3599 if (!iter) { 3600 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3601 if (!iter) 3602 return -ENOMEM; 3603 3604 cb->args[4] = (long)iter; 3605 } 3606 3607 rhashtable_walk_enter(&tn->sk_rht, iter); 3608 return 0; 3609 } 3610 3611 int tipc_dump_done(struct netlink_callback *cb) 3612 { 3613 struct rhashtable_iter *hti = (void *)cb->args[4]; 3614 3615 rhashtable_walk_exit(hti); 3616 kfree(hti); 3617 return 0; 3618 } 3619 EXPORT_SYMBOL(tipc_dump_done); 3620 3621 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3622 struct tipc_sock *tsk, u32 sk_filter_state, 3623 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3624 { 3625 struct sock *sk = &tsk->sk; 3626 struct nlattr *attrs; 3627 struct nlattr *stat; 3628 3629 /*filter response w.r.t sk_state*/ 3630 if (!(sk_filter_state & (1 << sk->sk_state))) 3631 return 0; 3632 3633 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3634 if (!attrs) 3635 goto msg_cancel; 3636 3637 if (__tipc_nl_add_sk_info(skb, tsk)) 3638 goto attr_msg_cancel; 3639 3640 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3641 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3642 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3643 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3644 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3645 sock_i_uid(sk))) || 3646 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3647 tipc_diag_gen_cookie(sk), 3648 TIPC_NLA_SOCK_PAD)) 3649 goto attr_msg_cancel; 3650 3651 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3652 if (!stat) 3653 goto attr_msg_cancel; 3654 3655 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3656 skb_queue_len(&sk->sk_receive_queue)) || 3657 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3658 skb_queue_len(&sk->sk_write_queue)) || 3659 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3660 atomic_read(&sk->sk_drops))) 3661 goto stat_msg_cancel; 3662 3663 if (tsk->cong_link_cnt && 3664 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3665 goto stat_msg_cancel; 3666 3667 if (tsk_conn_cong(tsk) && 3668 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3669 goto stat_msg_cancel; 3670 3671 nla_nest_end(skb, stat); 3672 3673 if (tsk->group) 3674 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3675 goto stat_msg_cancel; 3676 3677 nla_nest_end(skb, attrs); 3678 3679 return 0; 3680 3681 stat_msg_cancel: 3682 nla_nest_cancel(skb, stat); 3683 attr_msg_cancel: 3684 nla_nest_cancel(skb, attrs); 3685 msg_cancel: 3686 return -EMSGSIZE; 3687 } 3688 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3689 3690 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3691 { 3692 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3693 } 3694 3695 /* Caller should hold socket lock for the passed tipc socket. */ 3696 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3697 struct netlink_callback *cb, 3698 struct publication *publ) 3699 { 3700 void *hdr; 3701 struct nlattr *attrs; 3702 3703 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3704 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3705 if (!hdr) 3706 goto msg_cancel; 3707 3708 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3709 if (!attrs) 3710 goto genlmsg_cancel; 3711 3712 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3713 goto attr_msg_cancel; 3714 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type)) 3715 goto attr_msg_cancel; 3716 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower)) 3717 goto attr_msg_cancel; 3718 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper)) 3719 goto attr_msg_cancel; 3720 3721 nla_nest_end(skb, attrs); 3722 genlmsg_end(skb, hdr); 3723 3724 return 0; 3725 3726 attr_msg_cancel: 3727 nla_nest_cancel(skb, attrs); 3728 genlmsg_cancel: 3729 genlmsg_cancel(skb, hdr); 3730 msg_cancel: 3731 return -EMSGSIZE; 3732 } 3733 3734 /* Caller should hold socket lock for the passed tipc socket. */ 3735 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3736 struct netlink_callback *cb, 3737 struct tipc_sock *tsk, u32 *last_publ) 3738 { 3739 int err; 3740 struct publication *p; 3741 3742 if (*last_publ) { 3743 list_for_each_entry(p, &tsk->publications, binding_sock) { 3744 if (p->key == *last_publ) 3745 break; 3746 } 3747 if (list_entry_is_head(p, &tsk->publications, binding_sock)) { 3748 /* We never set seq or call nl_dump_check_consistent() 3749 * this means that setting prev_seq here will cause the 3750 * consistence check to fail in the netlink callback 3751 * handler. Resulting in the last NLMSG_DONE message 3752 * having the NLM_F_DUMP_INTR flag set. 3753 */ 3754 cb->prev_seq = 1; 3755 *last_publ = 0; 3756 return -EPIPE; 3757 } 3758 } else { 3759 p = list_first_entry(&tsk->publications, struct publication, 3760 binding_sock); 3761 } 3762 3763 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3764 err = __tipc_nl_add_sk_publ(skb, cb, p); 3765 if (err) { 3766 *last_publ = p->key; 3767 return err; 3768 } 3769 } 3770 *last_publ = 0; 3771 3772 return 0; 3773 } 3774 3775 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3776 { 3777 int err; 3778 u32 tsk_portid = cb->args[0]; 3779 u32 last_publ = cb->args[1]; 3780 u32 done = cb->args[2]; 3781 struct net *net = sock_net(skb->sk); 3782 struct tipc_sock *tsk; 3783 3784 if (!tsk_portid) { 3785 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs; 3786 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3787 3788 if (!attrs[TIPC_NLA_SOCK]) 3789 return -EINVAL; 3790 3791 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3792 attrs[TIPC_NLA_SOCK], 3793 tipc_nl_sock_policy, NULL); 3794 if (err) 3795 return err; 3796 3797 if (!sock[TIPC_NLA_SOCK_REF]) 3798 return -EINVAL; 3799 3800 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3801 } 3802 3803 if (done) 3804 return 0; 3805 3806 tsk = tipc_sk_lookup(net, tsk_portid); 3807 if (!tsk) 3808 return -EINVAL; 3809 3810 lock_sock(&tsk->sk); 3811 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3812 if (!err) 3813 done = 1; 3814 release_sock(&tsk->sk); 3815 sock_put(&tsk->sk); 3816 3817 cb->args[0] = tsk_portid; 3818 cb->args[1] = last_publ; 3819 cb->args[2] = done; 3820 3821 return skb->len; 3822 } 3823 3824 /** 3825 * tipc_sk_filtering - check if a socket should be traced 3826 * @sk: the socket to be examined 3827 * 3828 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering: 3829 * (portid, sock type, name type, name lower, name upper) 3830 * 3831 * Return: true if the socket meets the socket tuple data 3832 * (value 0 = 'any') or when there is no tuple set (all = 0), 3833 * otherwise false 3834 */ 3835 bool tipc_sk_filtering(struct sock *sk) 3836 { 3837 struct tipc_sock *tsk; 3838 struct publication *p; 3839 u32 _port, _sktype, _type, _lower, _upper; 3840 u32 type = 0, lower = 0, upper = 0; 3841 3842 if (!sk) 3843 return true; 3844 3845 tsk = tipc_sk(sk); 3846 3847 _port = sysctl_tipc_sk_filter[0]; 3848 _sktype = sysctl_tipc_sk_filter[1]; 3849 _type = sysctl_tipc_sk_filter[2]; 3850 _lower = sysctl_tipc_sk_filter[3]; 3851 _upper = sysctl_tipc_sk_filter[4]; 3852 3853 if (!_port && !_sktype && !_type && !_lower && !_upper) 3854 return true; 3855 3856 if (_port) 3857 return (_port == tsk->portid); 3858 3859 if (_sktype && _sktype != sk->sk_type) 3860 return false; 3861 3862 if (tsk->published) { 3863 p = list_first_entry_or_null(&tsk->publications, 3864 struct publication, binding_sock); 3865 if (p) { 3866 type = p->sr.type; 3867 lower = p->sr.lower; 3868 upper = p->sr.upper; 3869 } 3870 } 3871 3872 if (!tipc_sk_type_connectionless(sk)) { 3873 type = msg_nametype(&tsk->phdr); 3874 lower = msg_nameinst(&tsk->phdr); 3875 upper = lower; 3876 } 3877 3878 if ((_type && _type != type) || (_lower && _lower != lower) || 3879 (_upper && _upper != upper)) 3880 return false; 3881 3882 return true; 3883 } 3884 3885 u32 tipc_sock_get_portid(struct sock *sk) 3886 { 3887 return (sk) ? (tipc_sk(sk))->portid : 0; 3888 } 3889 3890 /** 3891 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3892 * both the rcv and backlog queues are considered 3893 * @sk: tipc sk to be checked 3894 * @skb: tipc msg to be checked 3895 * 3896 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3897 */ 3898 3899 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3900 { 3901 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3902 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3903 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3904 3905 return (qsize > lim * 90 / 100); 3906 } 3907 3908 /** 3909 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3910 * only the rcv queue is considered 3911 * @sk: tipc sk to be checked 3912 * @skb: tipc msg to be checked 3913 * 3914 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3915 */ 3916 3917 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3918 { 3919 unsigned int lim = rcvbuf_limit(sk, skb); 3920 unsigned int qsize = sk_rmem_alloc_get(sk); 3921 3922 return (qsize > lim * 90 / 100); 3923 } 3924 3925 /** 3926 * tipc_sk_dump - dump TIPC socket 3927 * @sk: tipc sk to be dumped 3928 * @dqueues: bitmask to decide if any socket queue to be dumped? 3929 * - TIPC_DUMP_NONE: don't dump socket queues 3930 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3931 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3932 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3933 * - TIPC_DUMP_ALL: dump all the socket queues above 3934 * @buf: returned buffer of dump data in format 3935 */ 3936 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3937 { 3938 int i = 0; 3939 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3940 u32 conn_type, conn_instance; 3941 struct tipc_sock *tsk; 3942 struct publication *p; 3943 bool tsk_connected; 3944 3945 if (!sk) { 3946 i += scnprintf(buf, sz, "sk data: (null)\n"); 3947 return i; 3948 } 3949 3950 tsk = tipc_sk(sk); 3951 tsk_connected = !tipc_sk_type_connectionless(sk); 3952 3953 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3954 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3955 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3956 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3957 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3958 if (tsk_connected) { 3959 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3960 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3961 conn_type = msg_nametype(&tsk->phdr); 3962 conn_instance = msg_nameinst(&tsk->phdr); 3963 i += scnprintf(buf + i, sz - i, " %u", conn_type); 3964 i += scnprintf(buf + i, sz - i, " %u", conn_instance); 3965 } 3966 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3967 if (tsk->published) { 3968 p = list_first_entry_or_null(&tsk->publications, 3969 struct publication, binding_sock); 3970 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0); 3971 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0); 3972 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0); 3973 } 3974 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3975 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3976 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3977 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3978 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3979 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3980 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3981 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3982 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3983 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3984 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3985 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3986 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3987 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3988 3989 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3990 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3991 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3992 } 3993 3994 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3995 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3996 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3997 } 3998 3999 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 4000 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 4001 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 4002 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 4003 i += scnprintf(buf + i, sz - i, " tail "); 4004 i += tipc_skb_dump(sk->sk_backlog.tail, false, 4005 buf + i); 4006 } 4007 } 4008 4009 return i; 4010 } 4011