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