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