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