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