1 /* 2 * net/tipc/socket.c: TIPC socket API 3 * 4 * Copyright (c) 2001-2007, 2012-2019, Ericsson AB 5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems 6 * Copyright (c) 2020-2021, Red Hat Inc 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the names of the copyright holders nor the names of its 18 * contributors may be used to endorse or promote products derived from 19 * this software without specific prior written permission. 20 * 21 * Alternatively, this software may be distributed under the terms of the 22 * GNU General Public License ("GPL") version 2 as published by the Free 23 * Software Foundation. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/rhashtable.h> 39 #include <linux/sched/signal.h> 40 #include <trace/events/sock.h> 41 42 #include "core.h" 43 #include "name_table.h" 44 #include "node.h" 45 #include "link.h" 46 #include "name_distr.h" 47 #include "socket.h" 48 #include "bcast.h" 49 #include "netlink.h" 50 #include "group.h" 51 #include "trace.h" 52 53 #define NAGLE_START_INIT 4 54 #define NAGLE_START_MAX 1024 55 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ 56 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */ 57 #define TIPC_MAX_PORT 0xffffffff 58 #define TIPC_MIN_PORT 1 59 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */ 60 61 enum { 62 TIPC_LISTEN = TCP_LISTEN, 63 TIPC_ESTABLISHED = TCP_ESTABLISHED, 64 TIPC_OPEN = TCP_CLOSE, 65 TIPC_DISCONNECTING = TCP_CLOSE_WAIT, 66 TIPC_CONNECTING = TCP_SYN_SENT, 67 }; 68 69 struct sockaddr_pair { 70 struct sockaddr_tipc sock; 71 struct sockaddr_tipc member; 72 }; 73 74 /** 75 * struct tipc_sock - TIPC socket structure 76 * @sk: socket - interacts with 'port' and with user via the socket API 77 * @max_pkt: maximum packet size "hint" used when building messages sent by port 78 * @maxnagle: maximum size of msg which can be subject to nagle 79 * @portid: unique port identity in TIPC socket hash table 80 * @phdr: preformatted message header used when sending messages 81 * @cong_links: list of congested links 82 * @publications: list of publications for port 83 * @pub_count: total # of publications port has made during its lifetime 84 * @conn_timeout: the time we can wait for an unresponded setup request 85 * @probe_unacked: probe has not received ack yet 86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 87 * @cong_link_cnt: number of congested links 88 * @snt_unacked: # messages sent by socket, and not yet acked by peer 89 * @snd_win: send window size 90 * @peer_caps: peer capabilities mask 91 * @rcv_unacked: # messages read by user, but not yet acked back to peer 92 * @rcv_win: receive window size 93 * @peer: 'connected' peer for dgram/rdm 94 * @node: hash table node 95 * @mc_method: cookie for use between socket and broadcast layer 96 * @rcu: rcu struct for tipc_sock 97 * @group: TIPC communications group 98 * @oneway: message count in one direction (FIXME) 99 * @nagle_start: current nagle value 100 * @snd_backlog: send backlog count 101 * @msg_acc: messages accepted; used in managing backlog and nagle 102 * @pkt_cnt: TIPC socket packet count 103 * @expect_ack: whether this TIPC socket is expecting an ack 104 * @nodelay: setsockopt() TIPC_NODELAY setting 105 * @group_is_open: TIPC socket group is fully open (FIXME) 106 * @published: true if port has one or more associated names 107 * @conn_addrtype: address type used when establishing connection 108 */ 109 struct tipc_sock { 110 struct sock sk; 111 u32 max_pkt; 112 u32 maxnagle; 113 u32 portid; 114 struct tipc_msg phdr; 115 struct list_head cong_links; 116 struct list_head publications; 117 u32 pub_count; 118 atomic_t dupl_rcvcnt; 119 u16 conn_timeout; 120 bool probe_unacked; 121 u16 cong_link_cnt; 122 u16 snt_unacked; 123 u16 snd_win; 124 u16 peer_caps; 125 u16 rcv_unacked; 126 u16 rcv_win; 127 struct sockaddr_tipc peer; 128 struct rhash_head node; 129 struct tipc_mc_method mc_method; 130 struct rcu_head rcu; 131 struct tipc_group *group; 132 u32 oneway; 133 u32 nagle_start; 134 u16 snd_backlog; 135 u16 msg_acc; 136 u16 pkt_cnt; 137 bool expect_ack; 138 bool nodelay; 139 bool group_is_open; 140 bool published; 141 u8 conn_addrtype; 142 }; 143 144 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 145 static void tipc_data_ready(struct sock *sk); 146 static void tipc_write_space(struct sock *sk); 147 static void tipc_sock_destruct(struct sock *sk); 148 static int tipc_release(struct socket *sock); 149 static void tipc_sk_timeout(struct timer_list *t); 150 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua); 151 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua); 152 static int tipc_sk_leave(struct tipc_sock *tsk); 153 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 154 static int tipc_sk_insert(struct tipc_sock *tsk); 155 static void tipc_sk_remove(struct tipc_sock *tsk); 156 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 157 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 158 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 159 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p); 160 161 static const struct proto_ops packet_ops; 162 static const struct proto_ops stream_ops; 163 static const struct proto_ops msg_ops; 164 static struct proto tipc_proto; 165 static const struct rhashtable_params tsk_rht_params; 166 167 static u32 tsk_own_node(struct tipc_sock *tsk) 168 { 169 return msg_prevnode(&tsk->phdr); 170 } 171 172 static u32 tsk_peer_node(struct tipc_sock *tsk) 173 { 174 return msg_destnode(&tsk->phdr); 175 } 176 177 static u32 tsk_peer_port(struct tipc_sock *tsk) 178 { 179 return msg_destport(&tsk->phdr); 180 } 181 182 static bool tsk_unreliable(struct tipc_sock *tsk) 183 { 184 return msg_src_droppable(&tsk->phdr) != 0; 185 } 186 187 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 188 { 189 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 190 } 191 192 static bool tsk_unreturnable(struct tipc_sock *tsk) 193 { 194 return msg_dest_droppable(&tsk->phdr) != 0; 195 } 196 197 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 198 { 199 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 200 } 201 202 static int tsk_importance(struct tipc_sock *tsk) 203 { 204 return msg_importance(&tsk->phdr); 205 } 206 207 static struct tipc_sock *tipc_sk(const struct sock *sk) 208 { 209 return container_of(sk, struct tipc_sock, sk); 210 } 211 212 int tsk_set_importance(struct sock *sk, int imp) 213 { 214 if (imp > TIPC_CRITICAL_IMPORTANCE) 215 return -EINVAL; 216 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 217 return 0; 218 } 219 220 static bool tsk_conn_cong(struct tipc_sock *tsk) 221 { 222 return tsk->snt_unacked > tsk->snd_win; 223 } 224 225 static u16 tsk_blocks(int len) 226 { 227 return ((len / FLOWCTL_BLK_SZ) + 1); 228 } 229 230 /* tsk_blocks(): translate a buffer size in bytes to number of 231 * advertisable blocks, taking into account the ratio truesize(len)/len 232 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 233 */ 234 static u16 tsk_adv_blocks(int len) 235 { 236 return len / FLOWCTL_BLK_SZ / 4; 237 } 238 239 /* tsk_inc(): increment counter for sent or received data 240 * - If block based flow control is not supported by peer we 241 * fall back to message based ditto, incrementing the counter 242 */ 243 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 244 { 245 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 246 return ((msglen / FLOWCTL_BLK_SZ) + 1); 247 return 1; 248 } 249 250 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 251 */ 252 static void tsk_set_nagle(struct tipc_sock *tsk) 253 { 254 struct sock *sk = &tsk->sk; 255 256 tsk->maxnagle = 0; 257 if (sk->sk_type != SOCK_STREAM) 258 return; 259 if (tsk->nodelay) 260 return; 261 if (!(tsk->peer_caps & TIPC_NAGLE)) 262 return; 263 /* Limit node local buffer size to avoid receive queue overflow */ 264 if (tsk->max_pkt == MAX_MSG_SIZE) 265 tsk->maxnagle = 1500; 266 else 267 tsk->maxnagle = tsk->max_pkt; 268 } 269 270 /** 271 * tsk_advance_rx_queue - discard first buffer in socket receive queue 272 * @sk: network socket 273 * 274 * Caller must hold socket lock 275 */ 276 static void tsk_advance_rx_queue(struct sock *sk) 277 { 278 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 279 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 280 } 281 282 /* tipc_sk_respond() : send response message back to sender 283 */ 284 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 285 { 286 u32 selector; 287 u32 dnode; 288 u32 onode = tipc_own_addr(sock_net(sk)); 289 290 if (!tipc_msg_reverse(onode, &skb, err)) 291 return; 292 293 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 294 dnode = msg_destnode(buf_msg(skb)); 295 selector = msg_origport(buf_msg(skb)); 296 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 297 } 298 299 /** 300 * tsk_rej_rx_queue - reject all buffers in socket receive queue 301 * @sk: network socket 302 * @error: response error code 303 * 304 * Caller must hold socket lock 305 */ 306 static void tsk_rej_rx_queue(struct sock *sk, int error) 307 { 308 struct sk_buff *skb; 309 310 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 311 tipc_sk_respond(sk, skb, error); 312 } 313 314 static bool tipc_sk_connected(const struct sock *sk) 315 { 316 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED; 317 } 318 319 /* tipc_sk_type_connectionless - check if the socket is datagram socket 320 * @sk: socket 321 * 322 * Returns true if connection less, false otherwise 323 */ 324 static bool tipc_sk_type_connectionless(struct sock *sk) 325 { 326 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 327 } 328 329 /* tsk_peer_msg - verify if message was sent by connected port's peer 330 * 331 * Handles cases where the node's network address has changed from 332 * the default of <0.0.0> to its configured setting. 333 */ 334 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 335 { 336 struct sock *sk = &tsk->sk; 337 u32 self = tipc_own_addr(sock_net(sk)); 338 u32 peer_port = tsk_peer_port(tsk); 339 u32 orig_node, peer_node; 340 341 if (unlikely(!tipc_sk_connected(sk))) 342 return false; 343 344 if (unlikely(msg_origport(msg) != peer_port)) 345 return false; 346 347 orig_node = msg_orignode(msg); 348 peer_node = tsk_peer_node(tsk); 349 350 if (likely(orig_node == peer_node)) 351 return true; 352 353 if (!orig_node && peer_node == self) 354 return true; 355 356 if (!peer_node && orig_node == self) 357 return true; 358 359 return false; 360 } 361 362 /* tipc_set_sk_state - set the sk_state of the socket 363 * @sk: socket 364 * 365 * Caller must hold socket lock 366 * 367 * Returns 0 on success, errno otherwise 368 */ 369 static int tipc_set_sk_state(struct sock *sk, int state) 370 { 371 int oldsk_state = sk->sk_state; 372 int res = -EINVAL; 373 374 switch (state) { 375 case TIPC_OPEN: 376 res = 0; 377 break; 378 case TIPC_LISTEN: 379 case TIPC_CONNECTING: 380 if (oldsk_state == TIPC_OPEN) 381 res = 0; 382 break; 383 case TIPC_ESTABLISHED: 384 if (oldsk_state == TIPC_CONNECTING || 385 oldsk_state == TIPC_OPEN) 386 res = 0; 387 break; 388 case TIPC_DISCONNECTING: 389 if (oldsk_state == TIPC_CONNECTING || 390 oldsk_state == TIPC_ESTABLISHED) 391 res = 0; 392 break; 393 } 394 395 if (!res) 396 sk->sk_state = state; 397 398 return res; 399 } 400 401 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 402 { 403 struct sock *sk = sock->sk; 404 int err = sock_error(sk); 405 int typ = sock->type; 406 407 if (err) 408 return err; 409 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 410 if (sk->sk_state == TIPC_DISCONNECTING) 411 return -EPIPE; 412 else if (!tipc_sk_connected(sk)) 413 return -ENOTCONN; 414 } 415 if (!*timeout) 416 return -EAGAIN; 417 if (signal_pending(current)) 418 return sock_intr_errno(*timeout); 419 420 return 0; 421 } 422 423 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 424 ({ \ 425 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 426 struct sock *sk_; \ 427 int rc_; \ 428 \ 429 while ((rc_ = !(condition_))) { \ 430 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 431 smp_rmb(); \ 432 sk_ = (sock_)->sk; \ 433 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 434 if (rc_) \ 435 break; \ 436 add_wait_queue(sk_sleep(sk_), &wait_); \ 437 release_sock(sk_); \ 438 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 439 sched_annotate_sleep(); \ 440 lock_sock(sk_); \ 441 remove_wait_queue(sk_sleep(sk_), &wait_); \ 442 } \ 443 rc_; \ 444 }) 445 446 /** 447 * tipc_sk_create - create a TIPC socket 448 * @net: network namespace (must be default network) 449 * @sock: pre-allocated socket structure 450 * @protocol: protocol indicator (must be 0) 451 * @kern: caused by kernel or by userspace? 452 * 453 * This routine creates additional data structures used by the TIPC socket, 454 * initializes them, and links them together. 455 * 456 * Return: 0 on success, errno otherwise 457 */ 458 static int tipc_sk_create(struct net *net, struct socket *sock, 459 int protocol, int kern) 460 { 461 const struct proto_ops *ops; 462 struct sock *sk; 463 struct tipc_sock *tsk; 464 struct tipc_msg *msg; 465 466 /* Validate arguments */ 467 if (unlikely(protocol != 0)) 468 return -EPROTONOSUPPORT; 469 470 switch (sock->type) { 471 case SOCK_STREAM: 472 ops = &stream_ops; 473 break; 474 case SOCK_SEQPACKET: 475 ops = &packet_ops; 476 break; 477 case SOCK_DGRAM: 478 case SOCK_RDM: 479 ops = &msg_ops; 480 break; 481 default: 482 return -EPROTOTYPE; 483 } 484 485 /* Allocate socket's protocol area */ 486 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 487 if (sk == NULL) 488 return -ENOMEM; 489 490 tsk = tipc_sk(sk); 491 tsk->max_pkt = MAX_PKT_DEFAULT; 492 tsk->maxnagle = 0; 493 tsk->nagle_start = NAGLE_START_INIT; 494 INIT_LIST_HEAD(&tsk->publications); 495 INIT_LIST_HEAD(&tsk->cong_links); 496 msg = &tsk->phdr; 497 498 /* Finish initializing socket data structures */ 499 sock->ops = ops; 500 sock_init_data(sock, sk); 501 tipc_set_sk_state(sk, TIPC_OPEN); 502 if (tipc_sk_insert(tsk)) { 503 sk_free(sk); 504 pr_warn("Socket create failed; port number exhausted\n"); 505 return -EINVAL; 506 } 507 508 /* Ensure tsk is visible before we read own_addr. */ 509 smp_mb(); 510 511 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 512 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 513 514 msg_set_origport(msg, tsk->portid); 515 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 516 sk->sk_shutdown = 0; 517 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 518 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]); 519 sk->sk_data_ready = tipc_data_ready; 520 sk->sk_write_space = tipc_write_space; 521 sk->sk_destruct = tipc_sock_destruct; 522 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 523 tsk->group_is_open = true; 524 atomic_set(&tsk->dupl_rcvcnt, 0); 525 526 /* Start out with safe limits until we receive an advertised window */ 527 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 528 tsk->rcv_win = tsk->snd_win; 529 530 if (tipc_sk_type_connectionless(sk)) { 531 tsk_set_unreturnable(tsk, true); 532 if (sock->type == SOCK_DGRAM) 533 tsk_set_unreliable(tsk, true); 534 } 535 __skb_queue_head_init(&tsk->mc_method.deferredq); 536 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 537 return 0; 538 } 539 540 static void tipc_sk_callback(struct rcu_head *head) 541 { 542 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 543 544 sock_put(&tsk->sk); 545 } 546 547 /* Caller should hold socket lock for the socket. */ 548 static void __tipc_shutdown(struct socket *sock, int error) 549 { 550 struct sock *sk = sock->sk; 551 struct tipc_sock *tsk = tipc_sk(sk); 552 struct net *net = sock_net(sk); 553 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 554 u32 dnode = tsk_peer_node(tsk); 555 struct sk_buff *skb; 556 557 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 558 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 559 !tsk_conn_cong(tsk))); 560 561 /* Push out delayed messages if in Nagle mode */ 562 tipc_sk_push_backlog(tsk, false); 563 /* Remove pending SYN */ 564 __skb_queue_purge(&sk->sk_write_queue); 565 566 /* Remove partially received buffer if any */ 567 skb = skb_peek(&sk->sk_receive_queue); 568 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 569 __skb_unlink(skb, &sk->sk_receive_queue); 570 kfree_skb(skb); 571 } 572 573 /* Reject all unreceived messages if connectionless */ 574 if (tipc_sk_type_connectionless(sk)) { 575 tsk_rej_rx_queue(sk, error); 576 return; 577 } 578 579 switch (sk->sk_state) { 580 case TIPC_CONNECTING: 581 case TIPC_ESTABLISHED: 582 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 583 tipc_node_remove_conn(net, dnode, tsk->portid); 584 /* Send a FIN+/- to its peer */ 585 skb = __skb_dequeue(&sk->sk_receive_queue); 586 if (skb) { 587 __skb_queue_purge(&sk->sk_receive_queue); 588 tipc_sk_respond(sk, skb, error); 589 break; 590 } 591 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 592 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 593 tsk_own_node(tsk), tsk_peer_port(tsk), 594 tsk->portid, error); 595 if (skb) 596 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 597 break; 598 case TIPC_LISTEN: 599 /* Reject all SYN messages */ 600 tsk_rej_rx_queue(sk, error); 601 break; 602 default: 603 __skb_queue_purge(&sk->sk_receive_queue); 604 break; 605 } 606 } 607 608 /** 609 * tipc_release - destroy a TIPC socket 610 * @sock: socket to destroy 611 * 612 * This routine cleans up any messages that are still queued on the socket. 613 * For DGRAM and RDM socket types, all queued messages are rejected. 614 * For SEQPACKET and STREAM socket types, the first message is rejected 615 * and any others are discarded. (If the first message on a STREAM socket 616 * is partially-read, it is discarded and the next one is rejected instead.) 617 * 618 * NOTE: Rejected messages are not necessarily returned to the sender! They 619 * are returned or discarded according to the "destination droppable" setting 620 * specified for the message by the sender. 621 * 622 * Return: 0 on success, errno otherwise 623 */ 624 static int tipc_release(struct socket *sock) 625 { 626 struct sock *sk = sock->sk; 627 struct tipc_sock *tsk; 628 629 /* 630 * Exit if socket isn't fully initialized (occurs when a failed accept() 631 * releases a pre-allocated child socket that was never used) 632 */ 633 if (sk == NULL) 634 return 0; 635 636 tsk = tipc_sk(sk); 637 lock_sock(sk); 638 639 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 640 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 641 sk->sk_shutdown = SHUTDOWN_MASK; 642 tipc_sk_leave(tsk); 643 tipc_sk_withdraw(tsk, NULL); 644 __skb_queue_purge(&tsk->mc_method.deferredq); 645 sk_stop_timer(sk, &sk->sk_timer); 646 tipc_sk_remove(tsk); 647 648 sock_orphan(sk); 649 /* Reject any messages that accumulated in backlog queue */ 650 release_sock(sk); 651 tipc_dest_list_purge(&tsk->cong_links); 652 tsk->cong_link_cnt = 0; 653 call_rcu(&tsk->rcu, tipc_sk_callback); 654 sock->sk = NULL; 655 656 return 0; 657 } 658 659 /** 660 * __tipc_bind - associate or disassociate TIPC name(s) with a socket 661 * @sock: socket structure 662 * @skaddr: socket address describing name(s) and desired operation 663 * @alen: size of socket address data structure 664 * 665 * Name and name sequence binding are indicated using a positive scope value; 666 * a negative scope value unbinds the specified name. Specifying no name 667 * (i.e. a socket address length of 0) unbinds all names from the socket. 668 * 669 * Return: 0 on success, errno otherwise 670 * 671 * NOTE: This routine doesn't need to take the socket lock since it doesn't 672 * access any non-constant socket information. 673 */ 674 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 675 { 676 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 677 struct tipc_sock *tsk = tipc_sk(sock->sk); 678 bool unbind = false; 679 680 if (unlikely(!alen)) 681 return tipc_sk_withdraw(tsk, NULL); 682 683 if (ua->addrtype == TIPC_SERVICE_ADDR) { 684 ua->addrtype = TIPC_SERVICE_RANGE; 685 ua->sr.upper = ua->sr.lower; 686 } 687 if (ua->scope < 0) { 688 unbind = true; 689 ua->scope = -ua->scope; 690 } 691 /* Users may still use deprecated TIPC_ZONE_SCOPE */ 692 if (ua->scope != TIPC_NODE_SCOPE) 693 ua->scope = TIPC_CLUSTER_SCOPE; 694 695 if (tsk->group) 696 return -EACCES; 697 698 if (unbind) 699 return tipc_sk_withdraw(tsk, ua); 700 return tipc_sk_publish(tsk, ua); 701 } 702 703 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 704 { 705 int res; 706 707 lock_sock(sock->sk); 708 res = __tipc_bind(sock, skaddr, alen); 709 release_sock(sock->sk); 710 return res; 711 } 712 713 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 714 { 715 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 716 u32 atype = ua->addrtype; 717 718 if (alen) { 719 if (!tipc_uaddr_valid(ua, alen)) 720 return -EINVAL; 721 if (atype == TIPC_SOCKET_ADDR) 722 return -EAFNOSUPPORT; 723 if (ua->sr.type < TIPC_RESERVED_TYPES) { 724 pr_warn_once("Can't bind to reserved service type %u\n", 725 ua->sr.type); 726 return -EACCES; 727 } 728 } 729 return tipc_sk_bind(sock, skaddr, alen); 730 } 731 732 /** 733 * tipc_getname - get port ID of socket or peer socket 734 * @sock: socket structure 735 * @uaddr: area for returned socket address 736 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 737 * 738 * Return: 0 on success, errno otherwise 739 * 740 * NOTE: This routine doesn't need to take the socket lock since it only 741 * accesses socket information that is unchanging (or which changes in 742 * a completely predictable manner). 743 */ 744 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 745 int peer) 746 { 747 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 748 struct sock *sk = sock->sk; 749 struct tipc_sock *tsk = tipc_sk(sk); 750 751 memset(addr, 0, sizeof(*addr)); 752 if (peer) { 753 if ((!tipc_sk_connected(sk)) && 754 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 755 return -ENOTCONN; 756 addr->addr.id.ref = tsk_peer_port(tsk); 757 addr->addr.id.node = tsk_peer_node(tsk); 758 } else { 759 addr->addr.id.ref = tsk->portid; 760 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 761 } 762 763 addr->addrtype = TIPC_SOCKET_ADDR; 764 addr->family = AF_TIPC; 765 addr->scope = 0; 766 addr->addr.name.domain = 0; 767 768 return sizeof(*addr); 769 } 770 771 /** 772 * tipc_poll - read and possibly block on pollmask 773 * @file: file structure associated with the socket 774 * @sock: socket for which to calculate the poll bits 775 * @wait: ??? 776 * 777 * Return: pollmask value 778 * 779 * COMMENTARY: 780 * It appears that the usual socket locking mechanisms are not useful here 781 * since the pollmask info is potentially out-of-date the moment this routine 782 * exits. TCP and other protocols seem to rely on higher level poll routines 783 * to handle any preventable race conditions, so TIPC will do the same ... 784 * 785 * IMPORTANT: The fact that a read or write operation is indicated does NOT 786 * imply that the operation will succeed, merely that it should be performed 787 * and will not block. 788 */ 789 static __poll_t tipc_poll(struct file *file, struct socket *sock, 790 poll_table *wait) 791 { 792 struct sock *sk = sock->sk; 793 struct tipc_sock *tsk = tipc_sk(sk); 794 __poll_t revents = 0; 795 796 sock_poll_wait(file, sock, wait); 797 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 798 799 if (sk->sk_shutdown & RCV_SHUTDOWN) 800 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 801 if (sk->sk_shutdown == SHUTDOWN_MASK) 802 revents |= EPOLLHUP; 803 804 switch (sk->sk_state) { 805 case TIPC_ESTABLISHED: 806 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 807 revents |= EPOLLOUT; 808 fallthrough; 809 case TIPC_LISTEN: 810 case TIPC_CONNECTING: 811 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 812 revents |= EPOLLIN | EPOLLRDNORM; 813 break; 814 case TIPC_OPEN: 815 if (tsk->group_is_open && !tsk->cong_link_cnt) 816 revents |= EPOLLOUT; 817 if (!tipc_sk_type_connectionless(sk)) 818 break; 819 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 820 break; 821 revents |= EPOLLIN | EPOLLRDNORM; 822 break; 823 case TIPC_DISCONNECTING: 824 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 825 break; 826 } 827 return revents; 828 } 829 830 /** 831 * tipc_sendmcast - send multicast message 832 * @sock: socket structure 833 * @ua: destination address struct 834 * @msg: message to send 835 * @dlen: length of data to send 836 * @timeout: timeout to wait for wakeup 837 * 838 * Called from function tipc_sendmsg(), which has done all sanity checks 839 * Return: the number of bytes sent on success, or errno 840 */ 841 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua, 842 struct msghdr *msg, size_t dlen, long timeout) 843 { 844 struct sock *sk = sock->sk; 845 struct tipc_sock *tsk = tipc_sk(sk); 846 struct tipc_msg *hdr = &tsk->phdr; 847 struct net *net = sock_net(sk); 848 int mtu = tipc_bcast_get_mtu(net); 849 struct sk_buff_head pkts; 850 struct tipc_nlist dsts; 851 int rc; 852 853 if (tsk->group) 854 return -EACCES; 855 856 /* Block or return if any destination link is congested */ 857 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 858 if (unlikely(rc)) 859 return rc; 860 861 /* Lookup destination nodes */ 862 tipc_nlist_init(&dsts, tipc_own_addr(net)); 863 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts); 864 if (!dsts.local && !dsts.remote) 865 return -EHOSTUNREACH; 866 867 /* Build message header */ 868 msg_set_type(hdr, TIPC_MCAST_MSG); 869 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 870 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 871 msg_set_destport(hdr, 0); 872 msg_set_destnode(hdr, 0); 873 msg_set_nametype(hdr, ua->sr.type); 874 msg_set_namelower(hdr, ua->sr.lower); 875 msg_set_nameupper(hdr, ua->sr.upper); 876 877 /* Build message as chain of buffers */ 878 __skb_queue_head_init(&pkts); 879 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 880 881 /* Send message if build was successful */ 882 if (unlikely(rc == dlen)) { 883 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 884 TIPC_DUMP_SK_SNDQ, " "); 885 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts, 886 &tsk->cong_link_cnt); 887 } 888 889 tipc_nlist_purge(&dsts); 890 891 return rc ? rc : dlen; 892 } 893 894 /** 895 * tipc_send_group_msg - send a message to a member in the group 896 * @net: network namespace 897 * @tsk: tipc socket 898 * @m: message to send 899 * @mb: group member 900 * @dnode: destination node 901 * @dport: destination port 902 * @dlen: total length of message data 903 */ 904 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 905 struct msghdr *m, struct tipc_member *mb, 906 u32 dnode, u32 dport, int dlen) 907 { 908 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 909 struct tipc_mc_method *method = &tsk->mc_method; 910 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 911 struct tipc_msg *hdr = &tsk->phdr; 912 struct sk_buff_head pkts; 913 int mtu, rc; 914 915 /* Complete message header */ 916 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 917 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 918 msg_set_destport(hdr, dport); 919 msg_set_destnode(hdr, dnode); 920 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 921 922 /* Build message as chain of buffers */ 923 __skb_queue_head_init(&pkts); 924 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 925 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 926 if (unlikely(rc != dlen)) 927 return rc; 928 929 /* Send message */ 930 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 931 if (unlikely(rc == -ELINKCONG)) { 932 tipc_dest_push(&tsk->cong_links, dnode, 0); 933 tsk->cong_link_cnt++; 934 } 935 936 /* Update send window */ 937 tipc_group_update_member(mb, blks); 938 939 /* A broadcast sent within next EXPIRE period must follow same path */ 940 method->rcast = true; 941 method->mandatory = true; 942 return dlen; 943 } 944 945 /** 946 * tipc_send_group_unicast - send message to a member in the group 947 * @sock: socket structure 948 * @m: message to send 949 * @dlen: total length of message data 950 * @timeout: timeout to wait for wakeup 951 * 952 * Called from function tipc_sendmsg(), which has done all sanity checks 953 * Return: the number of bytes sent on success, or errno 954 */ 955 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 956 int dlen, long timeout) 957 { 958 struct sock *sk = sock->sk; 959 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 960 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 961 struct tipc_sock *tsk = tipc_sk(sk); 962 struct net *net = sock_net(sk); 963 struct tipc_member *mb = NULL; 964 u32 node, port; 965 int rc; 966 967 node = ua->sk.node; 968 port = ua->sk.ref; 969 if (!port && !node) 970 return -EHOSTUNREACH; 971 972 /* Block or return if destination link or member is congested */ 973 rc = tipc_wait_for_cond(sock, &timeout, 974 !tipc_dest_find(&tsk->cong_links, node, 0) && 975 tsk->group && 976 !tipc_group_cong(tsk->group, node, port, blks, 977 &mb)); 978 if (unlikely(rc)) 979 return rc; 980 981 if (unlikely(!mb)) 982 return -EHOSTUNREACH; 983 984 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 985 986 return rc ? rc : dlen; 987 } 988 989 /** 990 * tipc_send_group_anycast - send message to any member with given identity 991 * @sock: socket structure 992 * @m: message to send 993 * @dlen: total length of message data 994 * @timeout: timeout to wait for wakeup 995 * 996 * Called from function tipc_sendmsg(), which has done all sanity checks 997 * Return: the number of bytes sent on success, or errno 998 */ 999 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 1000 int dlen, long timeout) 1001 { 1002 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1003 struct sock *sk = sock->sk; 1004 struct tipc_sock *tsk = tipc_sk(sk); 1005 struct list_head *cong_links = &tsk->cong_links; 1006 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 1007 struct tipc_msg *hdr = &tsk->phdr; 1008 struct tipc_member *first = NULL; 1009 struct tipc_member *mbr = NULL; 1010 struct net *net = sock_net(sk); 1011 u32 node, port, exclude; 1012 struct list_head dsts; 1013 int lookups = 0; 1014 int dstcnt, rc; 1015 bool cong; 1016 1017 INIT_LIST_HEAD(&dsts); 1018 ua->sa.type = msg_nametype(hdr); 1019 ua->scope = msg_lookup_scope(hdr); 1020 1021 while (++lookups < 4) { 1022 exclude = tipc_group_exclude(tsk->group); 1023 1024 first = NULL; 1025 1026 /* Look for a non-congested destination member, if any */ 1027 while (1) { 1028 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, 1029 exclude, false)) 1030 return -EHOSTUNREACH; 1031 tipc_dest_pop(&dsts, &node, &port); 1032 cong = tipc_group_cong(tsk->group, node, port, blks, 1033 &mbr); 1034 if (!cong) 1035 break; 1036 if (mbr == first) 1037 break; 1038 if (!first) 1039 first = mbr; 1040 } 1041 1042 /* Start over if destination was not in member list */ 1043 if (unlikely(!mbr)) 1044 continue; 1045 1046 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1047 break; 1048 1049 /* Block or return if destination link or member is congested */ 1050 rc = tipc_wait_for_cond(sock, &timeout, 1051 !tipc_dest_find(cong_links, node, 0) && 1052 tsk->group && 1053 !tipc_group_cong(tsk->group, node, port, 1054 blks, &mbr)); 1055 if (unlikely(rc)) 1056 return rc; 1057 1058 /* Send, unless destination disappeared while waiting */ 1059 if (likely(mbr)) 1060 break; 1061 } 1062 1063 if (unlikely(lookups >= 4)) 1064 return -EHOSTUNREACH; 1065 1066 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1067 1068 return rc ? rc : dlen; 1069 } 1070 1071 /** 1072 * tipc_send_group_bcast - send message to all members in communication group 1073 * @sock: socket structure 1074 * @m: message to send 1075 * @dlen: total length of message data 1076 * @timeout: timeout to wait for wakeup 1077 * 1078 * Called from function tipc_sendmsg(), which has done all sanity checks 1079 * Return: the number of bytes sent on success, or errno 1080 */ 1081 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1082 int dlen, long timeout) 1083 { 1084 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1085 struct sock *sk = sock->sk; 1086 struct net *net = sock_net(sk); 1087 struct tipc_sock *tsk = tipc_sk(sk); 1088 struct tipc_nlist *dsts; 1089 struct tipc_mc_method *method = &tsk->mc_method; 1090 bool ack = method->mandatory && method->rcast; 1091 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1092 struct tipc_msg *hdr = &tsk->phdr; 1093 int mtu = tipc_bcast_get_mtu(net); 1094 struct sk_buff_head pkts; 1095 int rc = -EHOSTUNREACH; 1096 1097 /* Block or return if any destination link or member is congested */ 1098 rc = tipc_wait_for_cond(sock, &timeout, 1099 !tsk->cong_link_cnt && tsk->group && 1100 !tipc_group_bc_cong(tsk->group, blks)); 1101 if (unlikely(rc)) 1102 return rc; 1103 1104 dsts = tipc_group_dests(tsk->group); 1105 if (!dsts->local && !dsts->remote) 1106 return -EHOSTUNREACH; 1107 1108 /* Complete message header */ 1109 if (ua) { 1110 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1111 msg_set_nameinst(hdr, ua->sa.instance); 1112 } else { 1113 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1114 msg_set_nameinst(hdr, 0); 1115 } 1116 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1117 msg_set_destport(hdr, 0); 1118 msg_set_destnode(hdr, 0); 1119 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1120 1121 /* Avoid getting stuck with repeated forced replicasts */ 1122 msg_set_grp_bc_ack_req(hdr, ack); 1123 1124 /* Build message as chain of buffers */ 1125 __skb_queue_head_init(&pkts); 1126 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1127 if (unlikely(rc != dlen)) 1128 return rc; 1129 1130 /* Send message */ 1131 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1132 if (unlikely(rc)) 1133 return rc; 1134 1135 /* Update broadcast sequence number and send windows */ 1136 tipc_group_update_bc_members(tsk->group, blks, ack); 1137 1138 /* Broadcast link is now free to choose method for next broadcast */ 1139 method->mandatory = false; 1140 method->expires = jiffies; 1141 1142 return dlen; 1143 } 1144 1145 /** 1146 * tipc_send_group_mcast - send message to all members with given identity 1147 * @sock: socket structure 1148 * @m: message to send 1149 * @dlen: total length of message data 1150 * @timeout: timeout to wait for wakeup 1151 * 1152 * Called from function tipc_sendmsg(), which has done all sanity checks 1153 * Return: the number of bytes sent on success, or errno 1154 */ 1155 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1156 int dlen, long timeout) 1157 { 1158 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1159 struct sock *sk = sock->sk; 1160 struct tipc_sock *tsk = tipc_sk(sk); 1161 struct tipc_group *grp = tsk->group; 1162 struct tipc_msg *hdr = &tsk->phdr; 1163 struct net *net = sock_net(sk); 1164 struct list_head dsts; 1165 u32 dstcnt, exclude; 1166 1167 INIT_LIST_HEAD(&dsts); 1168 ua->sa.type = msg_nametype(hdr); 1169 ua->scope = msg_lookup_scope(hdr); 1170 exclude = tipc_group_exclude(grp); 1171 1172 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true)) 1173 return -EHOSTUNREACH; 1174 1175 if (dstcnt == 1) { 1176 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref); 1177 return tipc_send_group_unicast(sock, m, dlen, timeout); 1178 } 1179 1180 tipc_dest_list_purge(&dsts); 1181 return tipc_send_group_bcast(sock, m, dlen, timeout); 1182 } 1183 1184 /** 1185 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1186 * @net: the associated network namespace 1187 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1188 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1189 * 1190 * Multi-threaded: parallel calls with reference to same queues may occur 1191 */ 1192 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1193 struct sk_buff_head *inputq) 1194 { 1195 u32 self = tipc_own_addr(net); 1196 struct sk_buff *skb, *_skb; 1197 u32 portid, onode; 1198 struct sk_buff_head tmpq; 1199 struct list_head dports; 1200 struct tipc_msg *hdr; 1201 struct tipc_uaddr ua; 1202 int user, mtyp, hlen; 1203 1204 __skb_queue_head_init(&tmpq); 1205 INIT_LIST_HEAD(&dports); 1206 ua.addrtype = TIPC_SERVICE_RANGE; 1207 1208 /* tipc_skb_peek() increments the head skb's reference counter */ 1209 skb = tipc_skb_peek(arrvq, &inputq->lock); 1210 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1211 hdr = buf_msg(skb); 1212 user = msg_user(hdr); 1213 mtyp = msg_type(hdr); 1214 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1215 onode = msg_orignode(hdr); 1216 ua.sr.type = msg_nametype(hdr); 1217 ua.sr.lower = msg_namelower(hdr); 1218 ua.sr.upper = msg_nameupper(hdr); 1219 if (onode == self) 1220 ua.scope = TIPC_ANY_SCOPE; 1221 else 1222 ua.scope = TIPC_CLUSTER_SCOPE; 1223 1224 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1225 spin_lock_bh(&inputq->lock); 1226 if (skb_peek(arrvq) == skb) { 1227 __skb_dequeue(arrvq); 1228 __skb_queue_tail(inputq, skb); 1229 } 1230 kfree_skb(skb); 1231 spin_unlock_bh(&inputq->lock); 1232 continue; 1233 } 1234 1235 /* Group messages require exact scope match */ 1236 if (msg_in_group(hdr)) { 1237 ua.sr.lower = 0; 1238 ua.sr.upper = ~0; 1239 ua.scope = msg_lookup_scope(hdr); 1240 } 1241 1242 /* Create destination port list: */ 1243 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports); 1244 1245 /* Clone message per destination */ 1246 while (tipc_dest_pop(&dports, NULL, &portid)) { 1247 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1248 if (_skb) { 1249 msg_set_destport(buf_msg(_skb), portid); 1250 __skb_queue_tail(&tmpq, _skb); 1251 continue; 1252 } 1253 pr_warn("Failed to clone mcast rcv buffer\n"); 1254 } 1255 /* Append clones to inputq only if skb is still head of arrvq */ 1256 spin_lock_bh(&inputq->lock); 1257 if (skb_peek(arrvq) == skb) { 1258 skb_queue_splice_tail_init(&tmpq, inputq); 1259 /* Decrement the skb's refcnt */ 1260 kfree_skb(__skb_dequeue(arrvq)); 1261 } 1262 spin_unlock_bh(&inputq->lock); 1263 __skb_queue_purge(&tmpq); 1264 kfree_skb(skb); 1265 } 1266 tipc_sk_rcv(net, inputq); 1267 } 1268 1269 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1270 * when socket is in Nagle mode 1271 */ 1272 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1273 { 1274 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1275 struct sk_buff *skb = skb_peek_tail(txq); 1276 struct net *net = sock_net(&tsk->sk); 1277 u32 dnode = tsk_peer_node(tsk); 1278 int rc; 1279 1280 if (nagle_ack) { 1281 tsk->pkt_cnt += skb_queue_len(txq); 1282 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1283 tsk->oneway = 0; 1284 if (tsk->nagle_start < NAGLE_START_MAX) 1285 tsk->nagle_start *= 2; 1286 tsk->expect_ack = false; 1287 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1288 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1289 tsk->nagle_start); 1290 } else { 1291 tsk->nagle_start = NAGLE_START_INIT; 1292 if (skb) { 1293 msg_set_ack_required(buf_msg(skb)); 1294 tsk->expect_ack = true; 1295 } else { 1296 tsk->expect_ack = false; 1297 } 1298 } 1299 tsk->msg_acc = 0; 1300 tsk->pkt_cnt = 0; 1301 } 1302 1303 if (!skb || tsk->cong_link_cnt) 1304 return; 1305 1306 /* Do not send SYN again after congestion */ 1307 if (msg_is_syn(buf_msg(skb))) 1308 return; 1309 1310 if (tsk->msg_acc) 1311 tsk->pkt_cnt += skb_queue_len(txq); 1312 tsk->snt_unacked += tsk->snd_backlog; 1313 tsk->snd_backlog = 0; 1314 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1315 if (rc == -ELINKCONG) 1316 tsk->cong_link_cnt = 1; 1317 } 1318 1319 /** 1320 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1321 * @tsk: receiving socket 1322 * @skb: pointer to message buffer. 1323 * @inputq: buffer list containing the buffers 1324 * @xmitq: output message area 1325 */ 1326 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1327 struct sk_buff_head *inputq, 1328 struct sk_buff_head *xmitq) 1329 { 1330 struct tipc_msg *hdr = buf_msg(skb); 1331 u32 onode = tsk_own_node(tsk); 1332 struct sock *sk = &tsk->sk; 1333 int mtyp = msg_type(hdr); 1334 bool was_cong; 1335 1336 /* Ignore if connection cannot be validated: */ 1337 if (!tsk_peer_msg(tsk, hdr)) { 1338 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1339 goto exit; 1340 } 1341 1342 if (unlikely(msg_errcode(hdr))) { 1343 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1344 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1345 tsk_peer_port(tsk)); 1346 sk->sk_state_change(sk); 1347 1348 /* State change is ignored if socket already awake, 1349 * - convert msg to abort msg and add to inqueue 1350 */ 1351 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1352 msg_set_type(hdr, TIPC_CONN_MSG); 1353 msg_set_size(hdr, BASIC_H_SIZE); 1354 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1355 __skb_queue_tail(inputq, skb); 1356 return; 1357 } 1358 1359 tsk->probe_unacked = false; 1360 1361 if (mtyp == CONN_PROBE) { 1362 msg_set_type(hdr, CONN_PROBE_REPLY); 1363 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1364 __skb_queue_tail(xmitq, skb); 1365 return; 1366 } else if (mtyp == CONN_ACK) { 1367 was_cong = tsk_conn_cong(tsk); 1368 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1369 tsk->snt_unacked -= msg_conn_ack(hdr); 1370 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1371 tsk->snd_win = msg_adv_win(hdr); 1372 if (was_cong && !tsk_conn_cong(tsk)) 1373 sk->sk_write_space(sk); 1374 } else if (mtyp != CONN_PROBE_REPLY) { 1375 pr_warn("Received unknown CONN_PROTO msg\n"); 1376 } 1377 exit: 1378 kfree_skb(skb); 1379 } 1380 1381 /** 1382 * tipc_sendmsg - send message in connectionless manner 1383 * @sock: socket structure 1384 * @m: message to send 1385 * @dsz: amount of user data to be sent 1386 * 1387 * Message must have an destination specified explicitly. 1388 * Used for SOCK_RDM and SOCK_DGRAM messages, 1389 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1390 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1391 * 1392 * Return: the number of bytes sent on success, or errno otherwise 1393 */ 1394 static int tipc_sendmsg(struct socket *sock, 1395 struct msghdr *m, size_t dsz) 1396 { 1397 struct sock *sk = sock->sk; 1398 int ret; 1399 1400 lock_sock(sk); 1401 ret = __tipc_sendmsg(sock, m, dsz); 1402 release_sock(sk); 1403 1404 return ret; 1405 } 1406 1407 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1408 { 1409 struct sock *sk = sock->sk; 1410 struct net *net = sock_net(sk); 1411 struct tipc_sock *tsk = tipc_sk(sk); 1412 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1413 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1414 struct list_head *clinks = &tsk->cong_links; 1415 bool syn = !tipc_sk_type_connectionless(sk); 1416 struct tipc_group *grp = tsk->group; 1417 struct tipc_msg *hdr = &tsk->phdr; 1418 struct tipc_socket_addr skaddr; 1419 struct sk_buff_head pkts; 1420 int atype, mtu, rc; 1421 1422 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1423 return -EMSGSIZE; 1424 1425 if (ua) { 1426 if (!tipc_uaddr_valid(ua, m->msg_namelen)) 1427 return -EINVAL; 1428 atype = ua->addrtype; 1429 } 1430 1431 /* If socket belongs to a communication group follow other paths */ 1432 if (grp) { 1433 if (!ua) 1434 return tipc_send_group_bcast(sock, m, dlen, timeout); 1435 if (atype == TIPC_SERVICE_ADDR) 1436 return tipc_send_group_anycast(sock, m, dlen, timeout); 1437 if (atype == TIPC_SOCKET_ADDR) 1438 return tipc_send_group_unicast(sock, m, dlen, timeout); 1439 if (atype == TIPC_SERVICE_RANGE) 1440 return tipc_send_group_mcast(sock, m, dlen, timeout); 1441 return -EINVAL; 1442 } 1443 1444 if (!ua) { 1445 ua = (struct tipc_uaddr *)&tsk->peer; 1446 if (!syn && ua->family != AF_TIPC) 1447 return -EDESTADDRREQ; 1448 atype = ua->addrtype; 1449 } 1450 1451 if (unlikely(syn)) { 1452 if (sk->sk_state == TIPC_LISTEN) 1453 return -EPIPE; 1454 if (sk->sk_state != TIPC_OPEN) 1455 return -EISCONN; 1456 if (tsk->published) 1457 return -EOPNOTSUPP; 1458 if (atype == TIPC_SERVICE_ADDR) 1459 tsk->conn_addrtype = atype; 1460 msg_set_syn(hdr, 1); 1461 } 1462 1463 memset(&skaddr, 0, sizeof(skaddr)); 1464 1465 /* Determine destination */ 1466 if (atype == TIPC_SERVICE_RANGE) { 1467 return tipc_sendmcast(sock, ua, m, dlen, timeout); 1468 } else if (atype == TIPC_SERVICE_ADDR) { 1469 skaddr.node = ua->lookup_node; 1470 ua->scope = tipc_node2scope(skaddr.node); 1471 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr)) 1472 return -EHOSTUNREACH; 1473 } else if (atype == TIPC_SOCKET_ADDR) { 1474 skaddr = ua->sk; 1475 } else { 1476 return -EINVAL; 1477 } 1478 1479 /* Block or return if destination link is congested */ 1480 rc = tipc_wait_for_cond(sock, &timeout, 1481 !tipc_dest_find(clinks, skaddr.node, 0)); 1482 if (unlikely(rc)) 1483 return rc; 1484 1485 /* Finally build message header */ 1486 msg_set_destnode(hdr, skaddr.node); 1487 msg_set_destport(hdr, skaddr.ref); 1488 if (atype == TIPC_SERVICE_ADDR) { 1489 msg_set_type(hdr, TIPC_NAMED_MSG); 1490 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1491 msg_set_nametype(hdr, ua->sa.type); 1492 msg_set_nameinst(hdr, ua->sa.instance); 1493 msg_set_lookup_scope(hdr, ua->scope); 1494 } else { /* TIPC_SOCKET_ADDR */ 1495 msg_set_type(hdr, TIPC_DIRECT_MSG); 1496 msg_set_lookup_scope(hdr, 0); 1497 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1498 } 1499 1500 /* Add message body */ 1501 __skb_queue_head_init(&pkts); 1502 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true); 1503 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1504 if (unlikely(rc != dlen)) 1505 return rc; 1506 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1507 __skb_queue_purge(&pkts); 1508 return -ENOMEM; 1509 } 1510 1511 /* Send message */ 1512 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1513 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid); 1514 if (unlikely(rc == -ELINKCONG)) { 1515 tipc_dest_push(clinks, skaddr.node, 0); 1516 tsk->cong_link_cnt++; 1517 rc = 0; 1518 } 1519 1520 if (unlikely(syn && !rc)) { 1521 tipc_set_sk_state(sk, TIPC_CONNECTING); 1522 if (dlen && timeout) { 1523 timeout = msecs_to_jiffies(timeout); 1524 tipc_wait_for_connect(sock, &timeout); 1525 } 1526 } 1527 1528 return rc ? rc : dlen; 1529 } 1530 1531 /** 1532 * tipc_sendstream - send stream-oriented data 1533 * @sock: socket structure 1534 * @m: data to send 1535 * @dsz: total length of data to be transmitted 1536 * 1537 * Used for SOCK_STREAM data. 1538 * 1539 * Return: the number of bytes sent on success (or partial success), 1540 * or errno if no data sent 1541 */ 1542 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1543 { 1544 struct sock *sk = sock->sk; 1545 int ret; 1546 1547 lock_sock(sk); 1548 ret = __tipc_sendstream(sock, m, dsz); 1549 release_sock(sk); 1550 1551 return ret; 1552 } 1553 1554 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1555 { 1556 struct sock *sk = sock->sk; 1557 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1558 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1559 struct sk_buff_head *txq = &sk->sk_write_queue; 1560 struct tipc_sock *tsk = tipc_sk(sk); 1561 struct tipc_msg *hdr = &tsk->phdr; 1562 struct net *net = sock_net(sk); 1563 struct sk_buff *skb; 1564 u32 dnode = tsk_peer_node(tsk); 1565 int maxnagle = tsk->maxnagle; 1566 int maxpkt = tsk->max_pkt; 1567 int send, sent = 0; 1568 int blocks, rc = 0; 1569 1570 if (unlikely(dlen > INT_MAX)) 1571 return -EMSGSIZE; 1572 1573 /* Handle implicit connection setup */ 1574 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) { 1575 rc = __tipc_sendmsg(sock, m, dlen); 1576 if (dlen && dlen == rc) { 1577 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1578 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1579 } 1580 return rc; 1581 } 1582 1583 do { 1584 rc = tipc_wait_for_cond(sock, &timeout, 1585 (!tsk->cong_link_cnt && 1586 !tsk_conn_cong(tsk) && 1587 tipc_sk_connected(sk))); 1588 if (unlikely(rc)) 1589 break; 1590 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1591 blocks = tsk->snd_backlog; 1592 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1593 send <= maxnagle) { 1594 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1595 if (unlikely(rc < 0)) 1596 break; 1597 blocks += rc; 1598 tsk->msg_acc++; 1599 if (blocks <= 64 && tsk->expect_ack) { 1600 tsk->snd_backlog = blocks; 1601 sent += send; 1602 break; 1603 } else if (blocks > 64) { 1604 tsk->pkt_cnt += skb_queue_len(txq); 1605 } else { 1606 skb = skb_peek_tail(txq); 1607 if (skb) { 1608 msg_set_ack_required(buf_msg(skb)); 1609 tsk->expect_ack = true; 1610 } else { 1611 tsk->expect_ack = false; 1612 } 1613 tsk->msg_acc = 0; 1614 tsk->pkt_cnt = 0; 1615 } 1616 } else { 1617 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1618 if (unlikely(rc != send)) 1619 break; 1620 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1621 } 1622 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1623 TIPC_DUMP_SK_SNDQ, " "); 1624 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1625 if (unlikely(rc == -ELINKCONG)) { 1626 tsk->cong_link_cnt = 1; 1627 rc = 0; 1628 } 1629 if (likely(!rc)) { 1630 tsk->snt_unacked += blocks; 1631 tsk->snd_backlog = 0; 1632 sent += send; 1633 } 1634 } while (sent < dlen && !rc); 1635 1636 return sent ? sent : rc; 1637 } 1638 1639 /** 1640 * tipc_send_packet - send a connection-oriented message 1641 * @sock: socket structure 1642 * @m: message to send 1643 * @dsz: length of data to be transmitted 1644 * 1645 * Used for SOCK_SEQPACKET messages. 1646 * 1647 * Return: the number of bytes sent on success, or errno otherwise 1648 */ 1649 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1650 { 1651 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1652 return -EMSGSIZE; 1653 1654 return tipc_sendstream(sock, m, dsz); 1655 } 1656 1657 /* tipc_sk_finish_conn - complete the setup of a connection 1658 */ 1659 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1660 u32 peer_node) 1661 { 1662 struct sock *sk = &tsk->sk; 1663 struct net *net = sock_net(sk); 1664 struct tipc_msg *msg = &tsk->phdr; 1665 1666 msg_set_syn(msg, 0); 1667 msg_set_destnode(msg, peer_node); 1668 msg_set_destport(msg, peer_port); 1669 msg_set_type(msg, TIPC_CONN_MSG); 1670 msg_set_lookup_scope(msg, 0); 1671 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1672 1673 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1674 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1675 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1676 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1677 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1678 tsk_set_nagle(tsk); 1679 __skb_queue_purge(&sk->sk_write_queue); 1680 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1681 return; 1682 1683 /* Fall back to message based flow control */ 1684 tsk->rcv_win = FLOWCTL_MSG_WIN; 1685 tsk->snd_win = FLOWCTL_MSG_WIN; 1686 } 1687 1688 /** 1689 * tipc_sk_set_orig_addr - capture sender's address for received message 1690 * @m: descriptor for message info 1691 * @skb: received message 1692 * 1693 * Note: Address is not captured if not requested by receiver. 1694 */ 1695 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1696 { 1697 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1698 struct tipc_msg *hdr = buf_msg(skb); 1699 1700 if (!srcaddr) 1701 return; 1702 1703 srcaddr->sock.family = AF_TIPC; 1704 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR; 1705 srcaddr->sock.scope = 0; 1706 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1707 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1708 srcaddr->sock.addr.name.domain = 0; 1709 m->msg_namelen = sizeof(struct sockaddr_tipc); 1710 1711 if (!msg_in_group(hdr)) 1712 return; 1713 1714 /* Group message users may also want to know sending member's id */ 1715 srcaddr->member.family = AF_TIPC; 1716 srcaddr->member.addrtype = TIPC_SERVICE_ADDR; 1717 srcaddr->member.scope = 0; 1718 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1719 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1720 srcaddr->member.addr.name.domain = 0; 1721 m->msg_namelen = sizeof(*srcaddr); 1722 } 1723 1724 /** 1725 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1726 * @m: descriptor for message info 1727 * @skb: received message buffer 1728 * @tsk: TIPC port associated with message 1729 * 1730 * Note: Ancillary data is not captured if not requested by receiver. 1731 * 1732 * Return: 0 if successful, otherwise errno 1733 */ 1734 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1735 struct tipc_sock *tsk) 1736 { 1737 struct tipc_msg *hdr; 1738 u32 data[3] = {0,}; 1739 bool has_addr; 1740 int dlen, rc; 1741 1742 if (likely(m->msg_controllen == 0)) 1743 return 0; 1744 1745 hdr = buf_msg(skb); 1746 dlen = msg_data_sz(hdr); 1747 1748 /* Capture errored message object, if any */ 1749 if (msg_errcode(hdr)) { 1750 if (skb_linearize(skb)) 1751 return -ENOMEM; 1752 hdr = buf_msg(skb); 1753 data[0] = msg_errcode(hdr); 1754 data[1] = dlen; 1755 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data); 1756 if (rc || !dlen) 1757 return rc; 1758 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr)); 1759 if (rc) 1760 return rc; 1761 } 1762 1763 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */ 1764 switch (msg_type(hdr)) { 1765 case TIPC_NAMED_MSG: 1766 has_addr = true; 1767 data[0] = msg_nametype(hdr); 1768 data[1] = msg_namelower(hdr); 1769 data[2] = data[1]; 1770 break; 1771 case TIPC_MCAST_MSG: 1772 has_addr = true; 1773 data[0] = msg_nametype(hdr); 1774 data[1] = msg_namelower(hdr); 1775 data[2] = msg_nameupper(hdr); 1776 break; 1777 case TIPC_CONN_MSG: 1778 has_addr = !!tsk->conn_addrtype; 1779 data[0] = msg_nametype(&tsk->phdr); 1780 data[1] = msg_nameinst(&tsk->phdr); 1781 data[2] = data[1]; 1782 break; 1783 default: 1784 has_addr = false; 1785 } 1786 if (!has_addr) 1787 return 0; 1788 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data); 1789 } 1790 1791 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1792 { 1793 struct sock *sk = &tsk->sk; 1794 struct sk_buff *skb = NULL; 1795 struct tipc_msg *msg; 1796 u32 peer_port = tsk_peer_port(tsk); 1797 u32 dnode = tsk_peer_node(tsk); 1798 1799 if (!tipc_sk_connected(sk)) 1800 return NULL; 1801 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1802 dnode, tsk_own_node(tsk), peer_port, 1803 tsk->portid, TIPC_OK); 1804 if (!skb) 1805 return NULL; 1806 msg = buf_msg(skb); 1807 msg_set_conn_ack(msg, tsk->rcv_unacked); 1808 tsk->rcv_unacked = 0; 1809 1810 /* Adjust to and advertize the correct window limit */ 1811 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1812 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1813 msg_set_adv_win(msg, tsk->rcv_win); 1814 } 1815 return skb; 1816 } 1817 1818 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1819 { 1820 struct sk_buff *skb; 1821 1822 skb = tipc_sk_build_ack(tsk); 1823 if (!skb) 1824 return; 1825 1826 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1827 msg_link_selector(buf_msg(skb))); 1828 } 1829 1830 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1831 { 1832 struct sock *sk = sock->sk; 1833 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1834 long timeo = *timeop; 1835 int err = sock_error(sk); 1836 1837 if (err) 1838 return err; 1839 1840 for (;;) { 1841 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1842 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1843 err = -ENOTCONN; 1844 break; 1845 } 1846 add_wait_queue(sk_sleep(sk), &wait); 1847 release_sock(sk); 1848 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1849 sched_annotate_sleep(); 1850 lock_sock(sk); 1851 remove_wait_queue(sk_sleep(sk), &wait); 1852 } 1853 err = 0; 1854 if (!skb_queue_empty(&sk->sk_receive_queue)) 1855 break; 1856 err = -EAGAIN; 1857 if (!timeo) 1858 break; 1859 err = sock_intr_errno(timeo); 1860 if (signal_pending(current)) 1861 break; 1862 1863 err = sock_error(sk); 1864 if (err) 1865 break; 1866 } 1867 *timeop = timeo; 1868 return err; 1869 } 1870 1871 /** 1872 * tipc_recvmsg - receive packet-oriented message 1873 * @sock: network socket 1874 * @m: descriptor for message info 1875 * @buflen: length of user buffer area 1876 * @flags: receive flags 1877 * 1878 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1879 * If the complete message doesn't fit in user area, truncate it. 1880 * 1881 * Return: size of returned message data, errno otherwise 1882 */ 1883 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1884 size_t buflen, int flags) 1885 { 1886 struct sock *sk = sock->sk; 1887 bool connected = !tipc_sk_type_connectionless(sk); 1888 struct tipc_sock *tsk = tipc_sk(sk); 1889 int rc, err, hlen, dlen, copy; 1890 struct tipc_skb_cb *skb_cb; 1891 struct sk_buff_head xmitq; 1892 struct tipc_msg *hdr; 1893 struct sk_buff *skb; 1894 bool grp_evt; 1895 long timeout; 1896 1897 /* Catch invalid receive requests */ 1898 if (unlikely(!buflen)) 1899 return -EINVAL; 1900 1901 lock_sock(sk); 1902 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1903 rc = -ENOTCONN; 1904 goto exit; 1905 } 1906 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1907 1908 /* Step rcv queue to first msg with data or error; wait if necessary */ 1909 do { 1910 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1911 if (unlikely(rc)) 1912 goto exit; 1913 skb = skb_peek(&sk->sk_receive_queue); 1914 skb_cb = TIPC_SKB_CB(skb); 1915 hdr = buf_msg(skb); 1916 dlen = msg_data_sz(hdr); 1917 hlen = msg_hdr_sz(hdr); 1918 err = msg_errcode(hdr); 1919 grp_evt = msg_is_grp_evt(hdr); 1920 if (likely(dlen || err)) 1921 break; 1922 tsk_advance_rx_queue(sk); 1923 } while (1); 1924 1925 /* Collect msg meta data, including error code and rejected data */ 1926 tipc_sk_set_orig_addr(m, skb); 1927 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1928 if (unlikely(rc)) 1929 goto exit; 1930 hdr = buf_msg(skb); 1931 1932 /* Capture data if non-error msg, otherwise just set return value */ 1933 if (likely(!err)) { 1934 int offset = skb_cb->bytes_read; 1935 1936 copy = min_t(int, dlen - offset, buflen); 1937 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 1938 if (unlikely(rc)) 1939 goto exit; 1940 if (unlikely(offset + copy < dlen)) { 1941 if (flags & MSG_EOR) { 1942 if (!(flags & MSG_PEEK)) 1943 skb_cb->bytes_read = offset + copy; 1944 } else { 1945 m->msg_flags |= MSG_TRUNC; 1946 skb_cb->bytes_read = 0; 1947 } 1948 } else { 1949 if (flags & MSG_EOR) 1950 m->msg_flags |= MSG_EOR; 1951 skb_cb->bytes_read = 0; 1952 } 1953 } else { 1954 copy = 0; 1955 rc = 0; 1956 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) { 1957 rc = -ECONNRESET; 1958 goto exit; 1959 } 1960 } 1961 1962 /* Mark message as group event if applicable */ 1963 if (unlikely(grp_evt)) { 1964 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1965 m->msg_flags |= MSG_EOR; 1966 m->msg_flags |= MSG_OOB; 1967 copy = 0; 1968 } 1969 1970 /* Caption of data or error code/rejected data was successful */ 1971 if (unlikely(flags & MSG_PEEK)) 1972 goto exit; 1973 1974 /* Send group flow control advertisement when applicable */ 1975 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1976 __skb_queue_head_init(&xmitq); 1977 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1978 msg_orignode(hdr), msg_origport(hdr), 1979 &xmitq); 1980 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1981 } 1982 1983 if (skb_cb->bytes_read) 1984 goto exit; 1985 1986 tsk_advance_rx_queue(sk); 1987 1988 if (likely(!connected)) 1989 goto exit; 1990 1991 /* Send connection flow control advertisement when applicable */ 1992 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1993 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1994 tipc_sk_send_ack(tsk); 1995 exit: 1996 release_sock(sk); 1997 return rc ? rc : copy; 1998 } 1999 2000 /** 2001 * tipc_recvstream - receive stream-oriented data 2002 * @sock: network socket 2003 * @m: descriptor for message info 2004 * @buflen: total size of user buffer area 2005 * @flags: receive flags 2006 * 2007 * Used for SOCK_STREAM messages only. If not enough data is available 2008 * will optionally wait for more; never truncates data. 2009 * 2010 * Return: size of returned message data, errno otherwise 2011 */ 2012 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 2013 size_t buflen, int flags) 2014 { 2015 struct sock *sk = sock->sk; 2016 struct tipc_sock *tsk = tipc_sk(sk); 2017 struct sk_buff *skb; 2018 struct tipc_msg *hdr; 2019 struct tipc_skb_cb *skb_cb; 2020 bool peek = flags & MSG_PEEK; 2021 int offset, required, copy, copied = 0; 2022 int hlen, dlen, err, rc; 2023 long timeout; 2024 2025 /* Catch invalid receive attempts */ 2026 if (unlikely(!buflen)) 2027 return -EINVAL; 2028 2029 lock_sock(sk); 2030 2031 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2032 rc = -ENOTCONN; 2033 goto exit; 2034 } 2035 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2036 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2037 2038 do { 2039 /* Look at first msg in receive queue; wait if necessary */ 2040 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2041 if (unlikely(rc)) 2042 break; 2043 skb = skb_peek(&sk->sk_receive_queue); 2044 skb_cb = TIPC_SKB_CB(skb); 2045 hdr = buf_msg(skb); 2046 dlen = msg_data_sz(hdr); 2047 hlen = msg_hdr_sz(hdr); 2048 err = msg_errcode(hdr); 2049 2050 /* Discard any empty non-errored (SYN-) message */ 2051 if (unlikely(!dlen && !err)) { 2052 tsk_advance_rx_queue(sk); 2053 continue; 2054 } 2055 2056 /* Collect msg meta data, incl. error code and rejected data */ 2057 if (!copied) { 2058 tipc_sk_set_orig_addr(m, skb); 2059 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2060 if (rc) 2061 break; 2062 hdr = buf_msg(skb); 2063 } 2064 2065 /* Copy data if msg ok, otherwise return error/partial data */ 2066 if (likely(!err)) { 2067 offset = skb_cb->bytes_read; 2068 copy = min_t(int, dlen - offset, buflen - copied); 2069 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2070 if (unlikely(rc)) 2071 break; 2072 copied += copy; 2073 offset += copy; 2074 if (unlikely(offset < dlen)) { 2075 if (!peek) 2076 skb_cb->bytes_read = offset; 2077 break; 2078 } 2079 } else { 2080 rc = 0; 2081 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2082 rc = -ECONNRESET; 2083 if (copied || rc) 2084 break; 2085 } 2086 2087 if (unlikely(peek)) 2088 break; 2089 2090 tsk_advance_rx_queue(sk); 2091 2092 /* Send connection flow control advertisement when applicable */ 2093 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2094 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2095 tipc_sk_send_ack(tsk); 2096 2097 /* Exit if all requested data or FIN/error received */ 2098 if (copied == buflen || err) 2099 break; 2100 2101 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2102 exit: 2103 release_sock(sk); 2104 return copied ? copied : rc; 2105 } 2106 2107 /** 2108 * tipc_write_space - wake up thread if port congestion is released 2109 * @sk: socket 2110 */ 2111 static void tipc_write_space(struct sock *sk) 2112 { 2113 struct socket_wq *wq; 2114 2115 rcu_read_lock(); 2116 wq = rcu_dereference(sk->sk_wq); 2117 if (skwq_has_sleeper(wq)) 2118 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2119 EPOLLWRNORM | EPOLLWRBAND); 2120 rcu_read_unlock(); 2121 } 2122 2123 /** 2124 * tipc_data_ready - wake up threads to indicate messages have been received 2125 * @sk: socket 2126 */ 2127 static void tipc_data_ready(struct sock *sk) 2128 { 2129 struct socket_wq *wq; 2130 2131 trace_sk_data_ready(sk); 2132 2133 rcu_read_lock(); 2134 wq = rcu_dereference(sk->sk_wq); 2135 if (skwq_has_sleeper(wq)) 2136 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2137 EPOLLRDNORM | EPOLLRDBAND); 2138 rcu_read_unlock(); 2139 } 2140 2141 static void tipc_sock_destruct(struct sock *sk) 2142 { 2143 __skb_queue_purge(&sk->sk_receive_queue); 2144 } 2145 2146 static void tipc_sk_proto_rcv(struct sock *sk, 2147 struct sk_buff_head *inputq, 2148 struct sk_buff_head *xmitq) 2149 { 2150 struct sk_buff *skb = __skb_dequeue(inputq); 2151 struct tipc_sock *tsk = tipc_sk(sk); 2152 struct tipc_msg *hdr = buf_msg(skb); 2153 struct tipc_group *grp = tsk->group; 2154 bool wakeup = false; 2155 2156 switch (msg_user(hdr)) { 2157 case CONN_MANAGER: 2158 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2159 return; 2160 case SOCK_WAKEUP: 2161 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2162 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2163 smp_wmb(); 2164 tsk->cong_link_cnt--; 2165 wakeup = true; 2166 tipc_sk_push_backlog(tsk, false); 2167 break; 2168 case GROUP_PROTOCOL: 2169 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2170 break; 2171 case TOP_SRV: 2172 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2173 hdr, inputq, xmitq); 2174 break; 2175 default: 2176 break; 2177 } 2178 2179 if (wakeup) 2180 sk->sk_write_space(sk); 2181 2182 kfree_skb(skb); 2183 } 2184 2185 /** 2186 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2187 * @tsk: TIPC socket 2188 * @skb: pointer to message buffer. 2189 * @xmitq: for Nagle ACK if any 2190 * Return: true if message should be added to receive queue, false otherwise 2191 */ 2192 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2193 struct sk_buff_head *xmitq) 2194 { 2195 struct sock *sk = &tsk->sk; 2196 struct net *net = sock_net(sk); 2197 struct tipc_msg *hdr = buf_msg(skb); 2198 bool con_msg = msg_connected(hdr); 2199 u32 pport = tsk_peer_port(tsk); 2200 u32 pnode = tsk_peer_node(tsk); 2201 u32 oport = msg_origport(hdr); 2202 u32 onode = msg_orignode(hdr); 2203 int err = msg_errcode(hdr); 2204 unsigned long delay; 2205 2206 if (unlikely(msg_mcast(hdr))) 2207 return false; 2208 tsk->oneway = 0; 2209 2210 switch (sk->sk_state) { 2211 case TIPC_CONNECTING: 2212 /* Setup ACK */ 2213 if (likely(con_msg)) { 2214 if (err) 2215 break; 2216 tipc_sk_finish_conn(tsk, oport, onode); 2217 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2218 /* ACK+ message with data is added to receive queue */ 2219 if (msg_data_sz(hdr)) 2220 return true; 2221 /* Empty ACK-, - wake up sleeping connect() and drop */ 2222 sk->sk_state_change(sk); 2223 msg_set_dest_droppable(hdr, 1); 2224 return false; 2225 } 2226 /* Ignore connectionless message if not from listening socket */ 2227 if (oport != pport || onode != pnode) 2228 return false; 2229 2230 /* Rejected SYN */ 2231 if (err != TIPC_ERR_OVERLOAD) 2232 break; 2233 2234 /* Prepare for new setup attempt if we have a SYN clone */ 2235 if (skb_queue_empty(&sk->sk_write_queue)) 2236 break; 2237 get_random_bytes(&delay, 2); 2238 delay %= (tsk->conn_timeout / 4); 2239 delay = msecs_to_jiffies(delay + 100); 2240 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2241 return false; 2242 case TIPC_OPEN: 2243 case TIPC_DISCONNECTING: 2244 return false; 2245 case TIPC_LISTEN: 2246 /* Accept only SYN message */ 2247 if (!msg_is_syn(hdr) && 2248 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2249 return false; 2250 if (!con_msg && !err) 2251 return true; 2252 return false; 2253 case TIPC_ESTABLISHED: 2254 if (!skb_queue_empty(&sk->sk_write_queue)) 2255 tipc_sk_push_backlog(tsk, false); 2256 /* Accept only connection-based messages sent by peer */ 2257 if (likely(con_msg && !err && pport == oport && 2258 pnode == onode)) { 2259 if (msg_ack_required(hdr)) { 2260 struct sk_buff *skb; 2261 2262 skb = tipc_sk_build_ack(tsk); 2263 if (skb) { 2264 msg_set_nagle_ack(buf_msg(skb)); 2265 __skb_queue_tail(xmitq, skb); 2266 } 2267 } 2268 return true; 2269 } 2270 if (!tsk_peer_msg(tsk, hdr)) 2271 return false; 2272 if (!err) 2273 return true; 2274 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2275 tipc_node_remove_conn(net, pnode, tsk->portid); 2276 sk->sk_state_change(sk); 2277 return true; 2278 default: 2279 pr_err("Unknown sk_state %u\n", sk->sk_state); 2280 } 2281 /* Abort connection setup attempt */ 2282 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2283 sk->sk_err = ECONNREFUSED; 2284 sk->sk_state_change(sk); 2285 return true; 2286 } 2287 2288 /** 2289 * rcvbuf_limit - get proper overload limit of socket receive queue 2290 * @sk: socket 2291 * @skb: message 2292 * 2293 * For connection oriented messages, irrespective of importance, 2294 * default queue limit is 2 MB. 2295 * 2296 * For connectionless messages, queue limits are based on message 2297 * importance as follows: 2298 * 2299 * TIPC_LOW_IMPORTANCE (2 MB) 2300 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2301 * TIPC_HIGH_IMPORTANCE (8 MB) 2302 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2303 * 2304 * Return: overload limit according to corresponding message importance 2305 */ 2306 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2307 { 2308 struct tipc_sock *tsk = tipc_sk(sk); 2309 struct tipc_msg *hdr = buf_msg(skb); 2310 2311 if (unlikely(msg_in_group(hdr))) 2312 return READ_ONCE(sk->sk_rcvbuf); 2313 2314 if (unlikely(!msg_connected(hdr))) 2315 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2316 2317 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2318 return READ_ONCE(sk->sk_rcvbuf); 2319 2320 return FLOWCTL_MSG_LIM; 2321 } 2322 2323 /** 2324 * tipc_sk_filter_rcv - validate incoming message 2325 * @sk: socket 2326 * @skb: pointer to message. 2327 * @xmitq: output message area (FIXME) 2328 * 2329 * Enqueues message on receive queue if acceptable; optionally handles 2330 * disconnect indication for a connected socket. 2331 * 2332 * Called with socket lock already taken 2333 */ 2334 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2335 struct sk_buff_head *xmitq) 2336 { 2337 bool sk_conn = !tipc_sk_type_connectionless(sk); 2338 struct tipc_sock *tsk = tipc_sk(sk); 2339 struct tipc_group *grp = tsk->group; 2340 struct tipc_msg *hdr = buf_msg(skb); 2341 struct net *net = sock_net(sk); 2342 struct sk_buff_head inputq; 2343 int mtyp = msg_type(hdr); 2344 int limit, err = TIPC_OK; 2345 2346 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2347 TIPC_SKB_CB(skb)->bytes_read = 0; 2348 __skb_queue_head_init(&inputq); 2349 __skb_queue_tail(&inputq, skb); 2350 2351 if (unlikely(!msg_isdata(hdr))) 2352 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2353 2354 if (unlikely(grp)) 2355 tipc_group_filter_msg(grp, &inputq, xmitq); 2356 2357 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2358 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2359 2360 /* Validate and add to receive buffer if there is space */ 2361 while ((skb = __skb_dequeue(&inputq))) { 2362 hdr = buf_msg(skb); 2363 limit = rcvbuf_limit(sk, skb); 2364 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2365 (!sk_conn && msg_connected(hdr)) || 2366 (!grp && msg_in_group(hdr))) 2367 err = TIPC_ERR_NO_PORT; 2368 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2369 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2370 "err_overload2!"); 2371 atomic_inc(&sk->sk_drops); 2372 err = TIPC_ERR_OVERLOAD; 2373 } 2374 2375 if (unlikely(err)) { 2376 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2377 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2378 "@filter_rcv!"); 2379 __skb_queue_tail(xmitq, skb); 2380 } 2381 err = TIPC_OK; 2382 continue; 2383 } 2384 __skb_queue_tail(&sk->sk_receive_queue, skb); 2385 skb_set_owner_r(skb, sk); 2386 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2387 "rcvq >90% allocated!"); 2388 sk->sk_data_ready(sk); 2389 } 2390 } 2391 2392 /** 2393 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2394 * @sk: socket 2395 * @skb: message 2396 * 2397 * Caller must hold socket lock 2398 */ 2399 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2400 { 2401 unsigned int before = sk_rmem_alloc_get(sk); 2402 struct sk_buff_head xmitq; 2403 unsigned int added; 2404 2405 __skb_queue_head_init(&xmitq); 2406 2407 tipc_sk_filter_rcv(sk, skb, &xmitq); 2408 added = sk_rmem_alloc_get(sk) - before; 2409 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2410 2411 /* Send pending response/rejected messages, if any */ 2412 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2413 return 0; 2414 } 2415 2416 /** 2417 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2418 * inputq and try adding them to socket or backlog queue 2419 * @inputq: list of incoming buffers with potentially different destinations 2420 * @sk: socket where the buffers should be enqueued 2421 * @dport: port number for the socket 2422 * @xmitq: output queue 2423 * 2424 * Caller must hold socket lock 2425 */ 2426 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2427 u32 dport, struct sk_buff_head *xmitq) 2428 { 2429 unsigned long time_limit = jiffies + usecs_to_jiffies(20000); 2430 struct sk_buff *skb; 2431 unsigned int lim; 2432 atomic_t *dcnt; 2433 u32 onode; 2434 2435 while (skb_queue_len(inputq)) { 2436 if (unlikely(time_after_eq(jiffies, time_limit))) 2437 return; 2438 2439 skb = tipc_skb_dequeue(inputq, dport); 2440 if (unlikely(!skb)) 2441 return; 2442 2443 /* Add message directly to receive queue if possible */ 2444 if (!sock_owned_by_user(sk)) { 2445 tipc_sk_filter_rcv(sk, skb, xmitq); 2446 continue; 2447 } 2448 2449 /* Try backlog, compensating for double-counted bytes */ 2450 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2451 if (!sk->sk_backlog.len) 2452 atomic_set(dcnt, 0); 2453 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2454 if (likely(!sk_add_backlog(sk, skb, lim))) { 2455 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2456 "bklg & rcvq >90% allocated!"); 2457 continue; 2458 } 2459 2460 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2461 /* Overload => reject message back to sender */ 2462 onode = tipc_own_addr(sock_net(sk)); 2463 atomic_inc(&sk->sk_drops); 2464 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2465 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2466 "@sk_enqueue!"); 2467 __skb_queue_tail(xmitq, skb); 2468 } 2469 break; 2470 } 2471 } 2472 2473 /** 2474 * tipc_sk_rcv - handle a chain of incoming buffers 2475 * @net: the associated network namespace 2476 * @inputq: buffer list containing the buffers 2477 * Consumes all buffers in list until inputq is empty 2478 * Note: may be called in multiple threads referring to the same queue 2479 */ 2480 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2481 { 2482 struct sk_buff_head xmitq; 2483 u32 dnode, dport = 0; 2484 int err; 2485 struct tipc_sock *tsk; 2486 struct sock *sk; 2487 struct sk_buff *skb; 2488 2489 __skb_queue_head_init(&xmitq); 2490 while (skb_queue_len(inputq)) { 2491 dport = tipc_skb_peek_port(inputq, dport); 2492 tsk = tipc_sk_lookup(net, dport); 2493 2494 if (likely(tsk)) { 2495 sk = &tsk->sk; 2496 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2497 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2498 spin_unlock_bh(&sk->sk_lock.slock); 2499 } 2500 /* Send pending response/rejected messages, if any */ 2501 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2502 sock_put(sk); 2503 continue; 2504 } 2505 /* No destination socket => dequeue skb if still there */ 2506 skb = tipc_skb_dequeue(inputq, dport); 2507 if (!skb) 2508 return; 2509 2510 /* Try secondary lookup if unresolved named message */ 2511 err = TIPC_ERR_NO_PORT; 2512 if (tipc_msg_lookup_dest(net, skb, &err)) 2513 goto xmit; 2514 2515 /* Prepare for message rejection */ 2516 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2517 continue; 2518 2519 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2520 xmit: 2521 dnode = msg_destnode(buf_msg(skb)); 2522 tipc_node_xmit_skb(net, skb, dnode, dport); 2523 } 2524 } 2525 2526 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2527 { 2528 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2529 struct sock *sk = sock->sk; 2530 int done; 2531 2532 do { 2533 int err = sock_error(sk); 2534 if (err) 2535 return err; 2536 if (!*timeo_p) 2537 return -ETIMEDOUT; 2538 if (signal_pending(current)) 2539 return sock_intr_errno(*timeo_p); 2540 if (sk->sk_state == TIPC_DISCONNECTING) 2541 break; 2542 2543 add_wait_queue(sk_sleep(sk), &wait); 2544 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2545 &wait); 2546 remove_wait_queue(sk_sleep(sk), &wait); 2547 } while (!done); 2548 return 0; 2549 } 2550 2551 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2552 { 2553 if (addr->family != AF_TIPC) 2554 return false; 2555 if (addr->addrtype == TIPC_SERVICE_RANGE) 2556 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2557 return (addr->addrtype == TIPC_SERVICE_ADDR || 2558 addr->addrtype == TIPC_SOCKET_ADDR); 2559 } 2560 2561 /** 2562 * tipc_connect - establish a connection to another TIPC port 2563 * @sock: socket structure 2564 * @dest: socket address for destination port 2565 * @destlen: size of socket address data structure 2566 * @flags: file-related flags associated with socket 2567 * 2568 * Return: 0 on success, errno otherwise 2569 */ 2570 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2571 int destlen, int flags) 2572 { 2573 struct sock *sk = sock->sk; 2574 struct tipc_sock *tsk = tipc_sk(sk); 2575 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2576 struct msghdr m = {NULL,}; 2577 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2578 int previous; 2579 int res = 0; 2580 2581 if (destlen != sizeof(struct sockaddr_tipc)) 2582 return -EINVAL; 2583 2584 lock_sock(sk); 2585 2586 if (tsk->group) { 2587 res = -EINVAL; 2588 goto exit; 2589 } 2590 2591 if (dst->family == AF_UNSPEC) { 2592 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2593 if (!tipc_sk_type_connectionless(sk)) 2594 res = -EINVAL; 2595 goto exit; 2596 } 2597 if (!tipc_sockaddr_is_sane(dst)) { 2598 res = -EINVAL; 2599 goto exit; 2600 } 2601 /* DGRAM/RDM connect(), just save the destaddr */ 2602 if (tipc_sk_type_connectionless(sk)) { 2603 memcpy(&tsk->peer, dest, destlen); 2604 goto exit; 2605 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2606 res = -EINVAL; 2607 goto exit; 2608 } 2609 2610 previous = sk->sk_state; 2611 2612 switch (sk->sk_state) { 2613 case TIPC_OPEN: 2614 /* Send a 'SYN-' to destination */ 2615 m.msg_name = dest; 2616 m.msg_namelen = destlen; 2617 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0); 2618 2619 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2620 * indicate send_msg() is never blocked. 2621 */ 2622 if (!timeout) 2623 m.msg_flags = MSG_DONTWAIT; 2624 2625 res = __tipc_sendmsg(sock, &m, 0); 2626 if ((res < 0) && (res != -EWOULDBLOCK)) 2627 goto exit; 2628 2629 /* Just entered TIPC_CONNECTING state; the only 2630 * difference is that return value in non-blocking 2631 * case is EINPROGRESS, rather than EALREADY. 2632 */ 2633 res = -EINPROGRESS; 2634 fallthrough; 2635 case TIPC_CONNECTING: 2636 if (!timeout) { 2637 if (previous == TIPC_CONNECTING) 2638 res = -EALREADY; 2639 goto exit; 2640 } 2641 timeout = msecs_to_jiffies(timeout); 2642 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2643 res = tipc_wait_for_connect(sock, &timeout); 2644 break; 2645 case TIPC_ESTABLISHED: 2646 res = -EISCONN; 2647 break; 2648 default: 2649 res = -EINVAL; 2650 } 2651 2652 exit: 2653 release_sock(sk); 2654 return res; 2655 } 2656 2657 /** 2658 * tipc_listen - allow socket to listen for incoming connections 2659 * @sock: socket structure 2660 * @len: (unused) 2661 * 2662 * Return: 0 on success, errno otherwise 2663 */ 2664 static int tipc_listen(struct socket *sock, int len) 2665 { 2666 struct sock *sk = sock->sk; 2667 int res; 2668 2669 lock_sock(sk); 2670 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2671 release_sock(sk); 2672 2673 return res; 2674 } 2675 2676 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2677 { 2678 struct sock *sk = sock->sk; 2679 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2680 int err; 2681 2682 /* True wake-one mechanism for incoming connections: only 2683 * one process gets woken up, not the 'whole herd'. 2684 * Since we do not 'race & poll' for established sockets 2685 * anymore, the common case will execute the loop only once. 2686 */ 2687 for (;;) { 2688 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2689 add_wait_queue(sk_sleep(sk), &wait); 2690 release_sock(sk); 2691 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 2692 lock_sock(sk); 2693 remove_wait_queue(sk_sleep(sk), &wait); 2694 } 2695 err = 0; 2696 if (!skb_queue_empty(&sk->sk_receive_queue)) 2697 break; 2698 err = -EAGAIN; 2699 if (!timeo) 2700 break; 2701 err = sock_intr_errno(timeo); 2702 if (signal_pending(current)) 2703 break; 2704 } 2705 return err; 2706 } 2707 2708 /** 2709 * tipc_accept - wait for connection request 2710 * @sock: listening socket 2711 * @new_sock: new socket that is to be connected 2712 * @arg: arguments for accept 2713 * 2714 * Return: 0 on success, errno otherwise 2715 */ 2716 static int tipc_accept(struct socket *sock, struct socket *new_sock, 2717 struct proto_accept_arg *arg) 2718 { 2719 struct sock *new_sk, *sk = sock->sk; 2720 struct tipc_sock *new_tsock; 2721 struct msghdr m = {NULL,}; 2722 struct tipc_msg *msg; 2723 struct sk_buff *buf; 2724 long timeo; 2725 int res; 2726 2727 lock_sock(sk); 2728 2729 if (sk->sk_state != TIPC_LISTEN) { 2730 res = -EINVAL; 2731 goto exit; 2732 } 2733 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 2734 res = tipc_wait_for_accept(sock, timeo); 2735 if (res) 2736 goto exit; 2737 2738 buf = skb_peek(&sk->sk_receive_queue); 2739 2740 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, arg->kern); 2741 if (res) 2742 goto exit; 2743 security_sk_clone(sock->sk, new_sock->sk); 2744 2745 new_sk = new_sock->sk; 2746 new_tsock = tipc_sk(new_sk); 2747 msg = buf_msg(buf); 2748 2749 /* we lock on new_sk; but lockdep sees the lock on sk */ 2750 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2751 2752 /* 2753 * Reject any stray messages received by new socket 2754 * before the socket lock was taken (very, very unlikely) 2755 */ 2756 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2757 2758 /* Connect new socket to it's peer */ 2759 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2760 2761 tsk_set_importance(new_sk, msg_importance(msg)); 2762 if (msg_named(msg)) { 2763 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR; 2764 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg)); 2765 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg)); 2766 } 2767 2768 /* 2769 * Respond to 'SYN-' by discarding it & returning 'ACK'. 2770 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'. 2771 */ 2772 if (!msg_data_sz(msg)) { 2773 tsk_advance_rx_queue(sk); 2774 } else { 2775 __skb_dequeue(&sk->sk_receive_queue); 2776 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2777 skb_set_owner_r(buf, new_sk); 2778 } 2779 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0); 2780 __tipc_sendstream(new_sock, &m, 0); 2781 release_sock(new_sk); 2782 exit: 2783 release_sock(sk); 2784 return res; 2785 } 2786 2787 /** 2788 * tipc_shutdown - shutdown socket connection 2789 * @sock: socket structure 2790 * @how: direction to close (must be SHUT_RDWR) 2791 * 2792 * Terminates connection (if necessary), then purges socket's receive queue. 2793 * 2794 * Return: 0 on success, errno otherwise 2795 */ 2796 static int tipc_shutdown(struct socket *sock, int how) 2797 { 2798 struct sock *sk = sock->sk; 2799 int res; 2800 2801 if (how != SHUT_RDWR) 2802 return -EINVAL; 2803 2804 lock_sock(sk); 2805 2806 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2807 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2808 sk->sk_shutdown = SHUTDOWN_MASK; 2809 2810 if (sk->sk_state == TIPC_DISCONNECTING) { 2811 /* Discard any unreceived messages */ 2812 __skb_queue_purge(&sk->sk_receive_queue); 2813 2814 res = 0; 2815 } else { 2816 res = -ENOTCONN; 2817 } 2818 /* Wake up anyone sleeping in poll. */ 2819 sk->sk_state_change(sk); 2820 2821 release_sock(sk); 2822 return res; 2823 } 2824 2825 static void tipc_sk_check_probing_state(struct sock *sk, 2826 struct sk_buff_head *list) 2827 { 2828 struct tipc_sock *tsk = tipc_sk(sk); 2829 u32 pnode = tsk_peer_node(tsk); 2830 u32 pport = tsk_peer_port(tsk); 2831 u32 self = tsk_own_node(tsk); 2832 u32 oport = tsk->portid; 2833 struct sk_buff *skb; 2834 2835 if (tsk->probe_unacked) { 2836 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2837 sk->sk_err = ECONNABORTED; 2838 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2839 sk->sk_state_change(sk); 2840 return; 2841 } 2842 /* Prepare new probe */ 2843 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2844 pnode, self, pport, oport, TIPC_OK); 2845 if (skb) 2846 __skb_queue_tail(list, skb); 2847 tsk->probe_unacked = true; 2848 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2849 } 2850 2851 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2852 { 2853 struct tipc_sock *tsk = tipc_sk(sk); 2854 2855 /* Try again later if dest link is congested */ 2856 if (tsk->cong_link_cnt) { 2857 sk_reset_timer(sk, &sk->sk_timer, 2858 jiffies + msecs_to_jiffies(100)); 2859 return; 2860 } 2861 /* Prepare SYN for retransmit */ 2862 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2863 } 2864 2865 static void tipc_sk_timeout(struct timer_list *t) 2866 { 2867 struct sock *sk = from_timer(sk, t, sk_timer); 2868 struct tipc_sock *tsk = tipc_sk(sk); 2869 u32 pnode = tsk_peer_node(tsk); 2870 struct sk_buff_head list; 2871 int rc = 0; 2872 2873 __skb_queue_head_init(&list); 2874 bh_lock_sock(sk); 2875 2876 /* Try again later if socket is busy */ 2877 if (sock_owned_by_user(sk)) { 2878 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2879 bh_unlock_sock(sk); 2880 sock_put(sk); 2881 return; 2882 } 2883 2884 if (sk->sk_state == TIPC_ESTABLISHED) 2885 tipc_sk_check_probing_state(sk, &list); 2886 else if (sk->sk_state == TIPC_CONNECTING) 2887 tipc_sk_retry_connect(sk, &list); 2888 2889 bh_unlock_sock(sk); 2890 2891 if (!skb_queue_empty(&list)) 2892 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2893 2894 /* SYN messages may cause link congestion */ 2895 if (rc == -ELINKCONG) { 2896 tipc_dest_push(&tsk->cong_links, pnode, 0); 2897 tsk->cong_link_cnt = 1; 2898 } 2899 sock_put(sk); 2900 } 2901 2902 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2903 { 2904 struct sock *sk = &tsk->sk; 2905 struct net *net = sock_net(sk); 2906 struct tipc_socket_addr skaddr; 2907 struct publication *p; 2908 u32 key; 2909 2910 if (tipc_sk_connected(sk)) 2911 return -EINVAL; 2912 key = tsk->portid + tsk->pub_count + 1; 2913 if (key == tsk->portid) 2914 return -EADDRINUSE; 2915 skaddr.ref = tsk->portid; 2916 skaddr.node = tipc_own_addr(net); 2917 p = tipc_nametbl_publish(net, ua, &skaddr, key); 2918 if (unlikely(!p)) 2919 return -EINVAL; 2920 2921 list_add(&p->binding_sock, &tsk->publications); 2922 tsk->pub_count++; 2923 tsk->published = true; 2924 return 0; 2925 } 2926 2927 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2928 { 2929 struct net *net = sock_net(&tsk->sk); 2930 struct publication *safe, *p; 2931 struct tipc_uaddr _ua; 2932 int rc = -EINVAL; 2933 2934 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) { 2935 if (!ua) { 2936 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope, 2937 p->sr.type, p->sr.lower, p->sr.upper); 2938 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key); 2939 continue; 2940 } 2941 /* Unbind specific publication */ 2942 if (p->scope != ua->scope) 2943 continue; 2944 if (p->sr.type != ua->sr.type) 2945 continue; 2946 if (p->sr.lower != ua->sr.lower) 2947 continue; 2948 if (p->sr.upper != ua->sr.upper) 2949 break; 2950 tipc_nametbl_withdraw(net, ua, &p->sk, p->key); 2951 rc = 0; 2952 break; 2953 } 2954 if (list_empty(&tsk->publications)) { 2955 tsk->published = 0; 2956 rc = 0; 2957 } 2958 return rc; 2959 } 2960 2961 /* tipc_sk_reinit: set non-zero address in all existing sockets 2962 * when we go from standalone to network mode. 2963 */ 2964 void tipc_sk_reinit(struct net *net) 2965 { 2966 struct tipc_net *tn = net_generic(net, tipc_net_id); 2967 struct rhashtable_iter iter; 2968 struct tipc_sock *tsk; 2969 struct tipc_msg *msg; 2970 2971 rhashtable_walk_enter(&tn->sk_rht, &iter); 2972 2973 do { 2974 rhashtable_walk_start(&iter); 2975 2976 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2977 sock_hold(&tsk->sk); 2978 rhashtable_walk_stop(&iter); 2979 lock_sock(&tsk->sk); 2980 msg = &tsk->phdr; 2981 msg_set_prevnode(msg, tipc_own_addr(net)); 2982 msg_set_orignode(msg, tipc_own_addr(net)); 2983 release_sock(&tsk->sk); 2984 rhashtable_walk_start(&iter); 2985 sock_put(&tsk->sk); 2986 } 2987 2988 rhashtable_walk_stop(&iter); 2989 } while (tsk == ERR_PTR(-EAGAIN)); 2990 2991 rhashtable_walk_exit(&iter); 2992 } 2993 2994 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2995 { 2996 struct tipc_net *tn = net_generic(net, tipc_net_id); 2997 struct tipc_sock *tsk; 2998 2999 rcu_read_lock(); 3000 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 3001 if (tsk) 3002 sock_hold(&tsk->sk); 3003 rcu_read_unlock(); 3004 3005 return tsk; 3006 } 3007 3008 static int tipc_sk_insert(struct tipc_sock *tsk) 3009 { 3010 struct sock *sk = &tsk->sk; 3011 struct net *net = sock_net(sk); 3012 struct tipc_net *tn = net_generic(net, tipc_net_id); 3013 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 3014 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT; 3015 3016 while (remaining--) { 3017 portid++; 3018 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 3019 portid = TIPC_MIN_PORT; 3020 tsk->portid = portid; 3021 sock_hold(&tsk->sk); 3022 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 3023 tsk_rht_params)) 3024 return 0; 3025 sock_put(&tsk->sk); 3026 } 3027 3028 return -1; 3029 } 3030 3031 static void tipc_sk_remove(struct tipc_sock *tsk) 3032 { 3033 struct sock *sk = &tsk->sk; 3034 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3035 3036 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3037 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3038 __sock_put(sk); 3039 } 3040 } 3041 3042 static const struct rhashtable_params tsk_rht_params = { 3043 .nelem_hint = 192, 3044 .head_offset = offsetof(struct tipc_sock, node), 3045 .key_offset = offsetof(struct tipc_sock, portid), 3046 .key_len = sizeof(u32), /* portid */ 3047 .max_size = 1048576, 3048 .min_size = 256, 3049 .automatic_shrinking = true, 3050 }; 3051 3052 int tipc_sk_rht_init(struct net *net) 3053 { 3054 struct tipc_net *tn = net_generic(net, tipc_net_id); 3055 3056 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3057 } 3058 3059 void tipc_sk_rht_destroy(struct net *net) 3060 { 3061 struct tipc_net *tn = net_generic(net, tipc_net_id); 3062 3063 /* Wait for socket readers to complete */ 3064 synchronize_net(); 3065 3066 rhashtable_destroy(&tn->sk_rht); 3067 } 3068 3069 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3070 { 3071 struct net *net = sock_net(&tsk->sk); 3072 struct tipc_group *grp = tsk->group; 3073 struct tipc_msg *hdr = &tsk->phdr; 3074 struct tipc_uaddr ua; 3075 int rc; 3076 3077 if (mreq->type < TIPC_RESERVED_TYPES) 3078 return -EACCES; 3079 if (mreq->scope > TIPC_NODE_SCOPE) 3080 return -EINVAL; 3081 if (mreq->scope != TIPC_NODE_SCOPE) 3082 mreq->scope = TIPC_CLUSTER_SCOPE; 3083 if (grp) 3084 return -EACCES; 3085 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3086 if (!grp) 3087 return -ENOMEM; 3088 tsk->group = grp; 3089 msg_set_lookup_scope(hdr, mreq->scope); 3090 msg_set_nametype(hdr, mreq->type); 3091 msg_set_dest_droppable(hdr, true); 3092 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope, 3093 mreq->type, mreq->instance, mreq->instance); 3094 tipc_nametbl_build_group(net, grp, &ua); 3095 rc = tipc_sk_publish(tsk, &ua); 3096 if (rc) { 3097 tipc_group_delete(net, grp); 3098 tsk->group = NULL; 3099 return rc; 3100 } 3101 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3102 tsk->mc_method.rcast = true; 3103 tsk->mc_method.mandatory = true; 3104 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3105 return rc; 3106 } 3107 3108 static int tipc_sk_leave(struct tipc_sock *tsk) 3109 { 3110 struct net *net = sock_net(&tsk->sk); 3111 struct tipc_group *grp = tsk->group; 3112 struct tipc_uaddr ua; 3113 int scope; 3114 3115 if (!grp) 3116 return -EINVAL; 3117 ua.addrtype = TIPC_SERVICE_RANGE; 3118 tipc_group_self(grp, &ua.sr, &scope); 3119 ua.scope = scope; 3120 tipc_group_delete(net, grp); 3121 tsk->group = NULL; 3122 tipc_sk_withdraw(tsk, &ua); 3123 return 0; 3124 } 3125 3126 /** 3127 * tipc_setsockopt - set socket option 3128 * @sock: socket structure 3129 * @lvl: option level 3130 * @opt: option identifier 3131 * @ov: pointer to new option value 3132 * @ol: length of option value 3133 * 3134 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3135 * (to ease compatibility). 3136 * 3137 * Return: 0 on success, errno otherwise 3138 */ 3139 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3140 sockptr_t ov, unsigned int ol) 3141 { 3142 struct sock *sk = sock->sk; 3143 struct tipc_sock *tsk = tipc_sk(sk); 3144 struct tipc_group_req mreq; 3145 u32 value = 0; 3146 int res = 0; 3147 3148 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3149 return 0; 3150 if (lvl != SOL_TIPC) 3151 return -ENOPROTOOPT; 3152 3153 switch (opt) { 3154 case TIPC_IMPORTANCE: 3155 case TIPC_SRC_DROPPABLE: 3156 case TIPC_DEST_DROPPABLE: 3157 case TIPC_CONN_TIMEOUT: 3158 case TIPC_NODELAY: 3159 if (ol < sizeof(value)) 3160 return -EINVAL; 3161 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3162 return -EFAULT; 3163 break; 3164 case TIPC_GROUP_JOIN: 3165 if (ol < sizeof(mreq)) 3166 return -EINVAL; 3167 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3168 return -EFAULT; 3169 break; 3170 default: 3171 if (!sockptr_is_null(ov) || ol) 3172 return -EINVAL; 3173 } 3174 3175 lock_sock(sk); 3176 3177 switch (opt) { 3178 case TIPC_IMPORTANCE: 3179 res = tsk_set_importance(sk, value); 3180 break; 3181 case TIPC_SRC_DROPPABLE: 3182 if (sock->type != SOCK_STREAM) 3183 tsk_set_unreliable(tsk, value); 3184 else 3185 res = -ENOPROTOOPT; 3186 break; 3187 case TIPC_DEST_DROPPABLE: 3188 tsk_set_unreturnable(tsk, value); 3189 break; 3190 case TIPC_CONN_TIMEOUT: 3191 tipc_sk(sk)->conn_timeout = value; 3192 break; 3193 case TIPC_MCAST_BROADCAST: 3194 tsk->mc_method.rcast = false; 3195 tsk->mc_method.mandatory = true; 3196 break; 3197 case TIPC_MCAST_REPLICAST: 3198 tsk->mc_method.rcast = true; 3199 tsk->mc_method.mandatory = true; 3200 break; 3201 case TIPC_GROUP_JOIN: 3202 res = tipc_sk_join(tsk, &mreq); 3203 break; 3204 case TIPC_GROUP_LEAVE: 3205 res = tipc_sk_leave(tsk); 3206 break; 3207 case TIPC_NODELAY: 3208 tsk->nodelay = !!value; 3209 tsk_set_nagle(tsk); 3210 break; 3211 default: 3212 res = -EINVAL; 3213 } 3214 3215 release_sock(sk); 3216 3217 return res; 3218 } 3219 3220 /** 3221 * tipc_getsockopt - get socket option 3222 * @sock: socket structure 3223 * @lvl: option level 3224 * @opt: option identifier 3225 * @ov: receptacle for option value 3226 * @ol: receptacle for length of option value 3227 * 3228 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3229 * (to ease compatibility). 3230 * 3231 * Return: 0 on success, errno otherwise 3232 */ 3233 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3234 char __user *ov, int __user *ol) 3235 { 3236 struct sock *sk = sock->sk; 3237 struct tipc_sock *tsk = tipc_sk(sk); 3238 struct tipc_service_range seq; 3239 int len, scope; 3240 u32 value; 3241 int res; 3242 3243 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3244 return put_user(0, ol); 3245 if (lvl != SOL_TIPC) 3246 return -ENOPROTOOPT; 3247 res = get_user(len, ol); 3248 if (res) 3249 return res; 3250 3251 lock_sock(sk); 3252 3253 switch (opt) { 3254 case TIPC_IMPORTANCE: 3255 value = tsk_importance(tsk); 3256 break; 3257 case TIPC_SRC_DROPPABLE: 3258 value = tsk_unreliable(tsk); 3259 break; 3260 case TIPC_DEST_DROPPABLE: 3261 value = tsk_unreturnable(tsk); 3262 break; 3263 case TIPC_CONN_TIMEOUT: 3264 value = tsk->conn_timeout; 3265 /* no need to set "res", since already 0 at this point */ 3266 break; 3267 case TIPC_NODE_RECVQ_DEPTH: 3268 value = 0; /* was tipc_queue_size, now obsolete */ 3269 break; 3270 case TIPC_SOCK_RECVQ_DEPTH: 3271 value = skb_queue_len(&sk->sk_receive_queue); 3272 break; 3273 case TIPC_SOCK_RECVQ_USED: 3274 value = sk_rmem_alloc_get(sk); 3275 break; 3276 case TIPC_GROUP_JOIN: 3277 seq.type = 0; 3278 if (tsk->group) 3279 tipc_group_self(tsk->group, &seq, &scope); 3280 value = seq.type; 3281 break; 3282 default: 3283 res = -EINVAL; 3284 } 3285 3286 release_sock(sk); 3287 3288 if (res) 3289 return res; /* "get" failed */ 3290 3291 if (len < sizeof(value)) 3292 return -EINVAL; 3293 3294 if (copy_to_user(ov, &value, sizeof(value))) 3295 return -EFAULT; 3296 3297 return put_user(sizeof(value), ol); 3298 } 3299 3300 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3301 { 3302 struct net *net = sock_net(sock->sk); 3303 struct tipc_sioc_nodeid_req nr = {0}; 3304 struct tipc_sioc_ln_req lnr; 3305 void __user *argp = (void __user *)arg; 3306 3307 switch (cmd) { 3308 case SIOCGETLINKNAME: 3309 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3310 return -EFAULT; 3311 if (!tipc_node_get_linkname(net, 3312 lnr.bearer_id & 0xffff, lnr.peer, 3313 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3314 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3315 return -EFAULT; 3316 return 0; 3317 } 3318 return -EADDRNOTAVAIL; 3319 case SIOCGETNODEID: 3320 if (copy_from_user(&nr, argp, sizeof(nr))) 3321 return -EFAULT; 3322 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3323 return -EADDRNOTAVAIL; 3324 if (copy_to_user(argp, &nr, sizeof(nr))) 3325 return -EFAULT; 3326 return 0; 3327 default: 3328 return -ENOIOCTLCMD; 3329 } 3330 } 3331 3332 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3333 { 3334 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3335 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3336 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3337 3338 tsk1->peer.family = AF_TIPC; 3339 tsk1->peer.addrtype = TIPC_SOCKET_ADDR; 3340 tsk1->peer.scope = TIPC_NODE_SCOPE; 3341 tsk1->peer.addr.id.ref = tsk2->portid; 3342 tsk1->peer.addr.id.node = onode; 3343 tsk2->peer.family = AF_TIPC; 3344 tsk2->peer.addrtype = TIPC_SOCKET_ADDR; 3345 tsk2->peer.scope = TIPC_NODE_SCOPE; 3346 tsk2->peer.addr.id.ref = tsk1->portid; 3347 tsk2->peer.addr.id.node = onode; 3348 3349 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3350 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3351 return 0; 3352 } 3353 3354 /* Protocol switches for the various types of TIPC sockets */ 3355 3356 static const struct proto_ops msg_ops = { 3357 .owner = THIS_MODULE, 3358 .family = AF_TIPC, 3359 .release = tipc_release, 3360 .bind = tipc_bind, 3361 .connect = tipc_connect, 3362 .socketpair = tipc_socketpair, 3363 .accept = sock_no_accept, 3364 .getname = tipc_getname, 3365 .poll = tipc_poll, 3366 .ioctl = tipc_ioctl, 3367 .listen = sock_no_listen, 3368 .shutdown = tipc_shutdown, 3369 .setsockopt = tipc_setsockopt, 3370 .getsockopt = tipc_getsockopt, 3371 .sendmsg = tipc_sendmsg, 3372 .recvmsg = tipc_recvmsg, 3373 .mmap = sock_no_mmap, 3374 }; 3375 3376 static const struct proto_ops packet_ops = { 3377 .owner = THIS_MODULE, 3378 .family = AF_TIPC, 3379 .release = tipc_release, 3380 .bind = tipc_bind, 3381 .connect = tipc_connect, 3382 .socketpair = tipc_socketpair, 3383 .accept = tipc_accept, 3384 .getname = tipc_getname, 3385 .poll = tipc_poll, 3386 .ioctl = tipc_ioctl, 3387 .listen = tipc_listen, 3388 .shutdown = tipc_shutdown, 3389 .setsockopt = tipc_setsockopt, 3390 .getsockopt = tipc_getsockopt, 3391 .sendmsg = tipc_send_packet, 3392 .recvmsg = tipc_recvmsg, 3393 .mmap = sock_no_mmap, 3394 }; 3395 3396 static const struct proto_ops stream_ops = { 3397 .owner = THIS_MODULE, 3398 .family = AF_TIPC, 3399 .release = tipc_release, 3400 .bind = tipc_bind, 3401 .connect = tipc_connect, 3402 .socketpair = tipc_socketpair, 3403 .accept = tipc_accept, 3404 .getname = tipc_getname, 3405 .poll = tipc_poll, 3406 .ioctl = tipc_ioctl, 3407 .listen = tipc_listen, 3408 .shutdown = tipc_shutdown, 3409 .setsockopt = tipc_setsockopt, 3410 .getsockopt = tipc_getsockopt, 3411 .sendmsg = tipc_sendstream, 3412 .recvmsg = tipc_recvstream, 3413 .mmap = sock_no_mmap, 3414 }; 3415 3416 static const struct net_proto_family tipc_family_ops = { 3417 .owner = THIS_MODULE, 3418 .family = AF_TIPC, 3419 .create = tipc_sk_create 3420 }; 3421 3422 static struct proto tipc_proto = { 3423 .name = "TIPC", 3424 .owner = THIS_MODULE, 3425 .obj_size = sizeof(struct tipc_sock), 3426 .sysctl_rmem = sysctl_tipc_rmem 3427 }; 3428 3429 /** 3430 * tipc_socket_init - initialize TIPC socket interface 3431 * 3432 * Return: 0 on success, errno otherwise 3433 */ 3434 int tipc_socket_init(void) 3435 { 3436 int res; 3437 3438 res = proto_register(&tipc_proto, 1); 3439 if (res) { 3440 pr_err("Failed to register TIPC protocol type\n"); 3441 goto out; 3442 } 3443 3444 res = sock_register(&tipc_family_ops); 3445 if (res) { 3446 pr_err("Failed to register TIPC socket type\n"); 3447 proto_unregister(&tipc_proto); 3448 goto out; 3449 } 3450 out: 3451 return res; 3452 } 3453 3454 /** 3455 * tipc_socket_stop - stop TIPC socket interface 3456 */ 3457 void tipc_socket_stop(void) 3458 { 3459 sock_unregister(tipc_family_ops.family); 3460 proto_unregister(&tipc_proto); 3461 } 3462 3463 /* Caller should hold socket lock for the passed tipc socket. */ 3464 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3465 { 3466 u32 peer_node, peer_port; 3467 u32 conn_type, conn_instance; 3468 struct nlattr *nest; 3469 3470 peer_node = tsk_peer_node(tsk); 3471 peer_port = tsk_peer_port(tsk); 3472 conn_type = msg_nametype(&tsk->phdr); 3473 conn_instance = msg_nameinst(&tsk->phdr); 3474 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3475 if (!nest) 3476 return -EMSGSIZE; 3477 3478 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3479 goto msg_full; 3480 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3481 goto msg_full; 3482 3483 if (tsk->conn_addrtype != 0) { 3484 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3485 goto msg_full; 3486 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type)) 3487 goto msg_full; 3488 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance)) 3489 goto msg_full; 3490 } 3491 nla_nest_end(skb, nest); 3492 3493 return 0; 3494 3495 msg_full: 3496 nla_nest_cancel(skb, nest); 3497 3498 return -EMSGSIZE; 3499 } 3500 3501 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3502 *tsk) 3503 { 3504 struct net *net = sock_net(skb->sk); 3505 struct sock *sk = &tsk->sk; 3506 3507 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3508 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3509 return -EMSGSIZE; 3510 3511 if (tipc_sk_connected(sk)) { 3512 if (__tipc_nl_add_sk_con(skb, tsk)) 3513 return -EMSGSIZE; 3514 } else if (!list_empty(&tsk->publications)) { 3515 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3516 return -EMSGSIZE; 3517 } 3518 return 0; 3519 } 3520 3521 /* Caller should hold socket lock for the passed tipc socket. */ 3522 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3523 struct tipc_sock *tsk) 3524 { 3525 struct nlattr *attrs; 3526 void *hdr; 3527 3528 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3529 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3530 if (!hdr) 3531 goto msg_cancel; 3532 3533 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3534 if (!attrs) 3535 goto genlmsg_cancel; 3536 3537 if (__tipc_nl_add_sk_info(skb, tsk)) 3538 goto attr_msg_cancel; 3539 3540 nla_nest_end(skb, attrs); 3541 genlmsg_end(skb, hdr); 3542 3543 return 0; 3544 3545 attr_msg_cancel: 3546 nla_nest_cancel(skb, attrs); 3547 genlmsg_cancel: 3548 genlmsg_cancel(skb, hdr); 3549 msg_cancel: 3550 return -EMSGSIZE; 3551 } 3552 3553 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3554 int (*skb_handler)(struct sk_buff *skb, 3555 struct netlink_callback *cb, 3556 struct tipc_sock *tsk)) 3557 { 3558 struct rhashtable_iter *iter = (void *)cb->args[4]; 3559 struct tipc_sock *tsk; 3560 int err; 3561 3562 rhashtable_walk_start(iter); 3563 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3564 if (IS_ERR(tsk)) { 3565 if (PTR_ERR(tsk) == -EAGAIN) 3566 continue; 3567 break; 3568 } 3569 3570 sock_hold(&tsk->sk); 3571 rhashtable_walk_stop(iter); 3572 lock_sock(&tsk->sk); 3573 err = skb_handler(skb, cb, tsk); 3574 if (err) { 3575 release_sock(&tsk->sk); 3576 sock_put(&tsk->sk); 3577 goto out; 3578 } 3579 release_sock(&tsk->sk); 3580 rhashtable_walk_start(iter); 3581 sock_put(&tsk->sk); 3582 } 3583 rhashtable_walk_stop(iter); 3584 out: 3585 return skb->len; 3586 } 3587 EXPORT_SYMBOL(tipc_nl_sk_walk); 3588 3589 int tipc_dump_start(struct netlink_callback *cb) 3590 { 3591 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3592 } 3593 EXPORT_SYMBOL(tipc_dump_start); 3594 3595 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3596 { 3597 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3598 struct rhashtable_iter *iter = (void *)cb->args[4]; 3599 struct tipc_net *tn = tipc_net(net); 3600 3601 if (!iter) { 3602 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3603 if (!iter) 3604 return -ENOMEM; 3605 3606 cb->args[4] = (long)iter; 3607 } 3608 3609 rhashtable_walk_enter(&tn->sk_rht, iter); 3610 return 0; 3611 } 3612 3613 int tipc_dump_done(struct netlink_callback *cb) 3614 { 3615 struct rhashtable_iter *hti = (void *)cb->args[4]; 3616 3617 rhashtable_walk_exit(hti); 3618 kfree(hti); 3619 return 0; 3620 } 3621 EXPORT_SYMBOL(tipc_dump_done); 3622 3623 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3624 struct tipc_sock *tsk, u32 sk_filter_state, 3625 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3626 { 3627 struct sock *sk = &tsk->sk; 3628 struct nlattr *attrs; 3629 struct nlattr *stat; 3630 3631 /*filter response w.r.t sk_state*/ 3632 if (!(sk_filter_state & (1 << sk->sk_state))) 3633 return 0; 3634 3635 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3636 if (!attrs) 3637 goto msg_cancel; 3638 3639 if (__tipc_nl_add_sk_info(skb, tsk)) 3640 goto attr_msg_cancel; 3641 3642 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3643 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3644 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3645 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3646 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3647 sock_i_uid(sk))) || 3648 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3649 tipc_diag_gen_cookie(sk), 3650 TIPC_NLA_SOCK_PAD)) 3651 goto attr_msg_cancel; 3652 3653 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3654 if (!stat) 3655 goto attr_msg_cancel; 3656 3657 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3658 skb_queue_len(&sk->sk_receive_queue)) || 3659 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3660 skb_queue_len(&sk->sk_write_queue)) || 3661 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3662 atomic_read(&sk->sk_drops))) 3663 goto stat_msg_cancel; 3664 3665 if (tsk->cong_link_cnt && 3666 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3667 goto stat_msg_cancel; 3668 3669 if (tsk_conn_cong(tsk) && 3670 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3671 goto stat_msg_cancel; 3672 3673 nla_nest_end(skb, stat); 3674 3675 if (tsk->group) 3676 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3677 goto stat_msg_cancel; 3678 3679 nla_nest_end(skb, attrs); 3680 3681 return 0; 3682 3683 stat_msg_cancel: 3684 nla_nest_cancel(skb, stat); 3685 attr_msg_cancel: 3686 nla_nest_cancel(skb, attrs); 3687 msg_cancel: 3688 return -EMSGSIZE; 3689 } 3690 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3691 3692 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3693 { 3694 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3695 } 3696 3697 /* Caller should hold socket lock for the passed tipc socket. */ 3698 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3699 struct netlink_callback *cb, 3700 struct publication *publ) 3701 { 3702 void *hdr; 3703 struct nlattr *attrs; 3704 3705 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3706 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3707 if (!hdr) 3708 goto msg_cancel; 3709 3710 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3711 if (!attrs) 3712 goto genlmsg_cancel; 3713 3714 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3715 goto attr_msg_cancel; 3716 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type)) 3717 goto attr_msg_cancel; 3718 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower)) 3719 goto attr_msg_cancel; 3720 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper)) 3721 goto attr_msg_cancel; 3722 3723 nla_nest_end(skb, attrs); 3724 genlmsg_end(skb, hdr); 3725 3726 return 0; 3727 3728 attr_msg_cancel: 3729 nla_nest_cancel(skb, attrs); 3730 genlmsg_cancel: 3731 genlmsg_cancel(skb, hdr); 3732 msg_cancel: 3733 return -EMSGSIZE; 3734 } 3735 3736 /* Caller should hold socket lock for the passed tipc socket. */ 3737 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3738 struct netlink_callback *cb, 3739 struct tipc_sock *tsk, u32 *last_publ) 3740 { 3741 int err; 3742 struct publication *p; 3743 3744 if (*last_publ) { 3745 list_for_each_entry(p, &tsk->publications, binding_sock) { 3746 if (p->key == *last_publ) 3747 break; 3748 } 3749 if (list_entry_is_head(p, &tsk->publications, binding_sock)) { 3750 /* We never set seq or call nl_dump_check_consistent() 3751 * this means that setting prev_seq here will cause the 3752 * consistence check to fail in the netlink callback 3753 * handler. Resulting in the last NLMSG_DONE message 3754 * having the NLM_F_DUMP_INTR flag set. 3755 */ 3756 cb->prev_seq = 1; 3757 *last_publ = 0; 3758 return -EPIPE; 3759 } 3760 } else { 3761 p = list_first_entry(&tsk->publications, struct publication, 3762 binding_sock); 3763 } 3764 3765 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3766 err = __tipc_nl_add_sk_publ(skb, cb, p); 3767 if (err) { 3768 *last_publ = p->key; 3769 return err; 3770 } 3771 } 3772 *last_publ = 0; 3773 3774 return 0; 3775 } 3776 3777 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3778 { 3779 int err; 3780 u32 tsk_portid = cb->args[0]; 3781 u32 last_publ = cb->args[1]; 3782 u32 done = cb->args[2]; 3783 struct net *net = sock_net(skb->sk); 3784 struct tipc_sock *tsk; 3785 3786 if (!tsk_portid) { 3787 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs; 3788 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3789 3790 if (!attrs[TIPC_NLA_SOCK]) 3791 return -EINVAL; 3792 3793 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3794 attrs[TIPC_NLA_SOCK], 3795 tipc_nl_sock_policy, NULL); 3796 if (err) 3797 return err; 3798 3799 if (!sock[TIPC_NLA_SOCK_REF]) 3800 return -EINVAL; 3801 3802 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3803 } 3804 3805 if (done) 3806 return 0; 3807 3808 tsk = tipc_sk_lookup(net, tsk_portid); 3809 if (!tsk) 3810 return -EINVAL; 3811 3812 lock_sock(&tsk->sk); 3813 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3814 if (!err) 3815 done = 1; 3816 release_sock(&tsk->sk); 3817 sock_put(&tsk->sk); 3818 3819 cb->args[0] = tsk_portid; 3820 cb->args[1] = last_publ; 3821 cb->args[2] = done; 3822 3823 return skb->len; 3824 } 3825 3826 /** 3827 * tipc_sk_filtering - check if a socket should be traced 3828 * @sk: the socket to be examined 3829 * 3830 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering: 3831 * (portid, sock type, name type, name lower, name upper) 3832 * 3833 * Return: true if the socket meets the socket tuple data 3834 * (value 0 = 'any') or when there is no tuple set (all = 0), 3835 * otherwise false 3836 */ 3837 bool tipc_sk_filtering(struct sock *sk) 3838 { 3839 struct tipc_sock *tsk; 3840 struct publication *p; 3841 u32 _port, _sktype, _type, _lower, _upper; 3842 u32 type = 0, lower = 0, upper = 0; 3843 3844 if (!sk) 3845 return true; 3846 3847 tsk = tipc_sk(sk); 3848 3849 _port = sysctl_tipc_sk_filter[0]; 3850 _sktype = sysctl_tipc_sk_filter[1]; 3851 _type = sysctl_tipc_sk_filter[2]; 3852 _lower = sysctl_tipc_sk_filter[3]; 3853 _upper = sysctl_tipc_sk_filter[4]; 3854 3855 if (!_port && !_sktype && !_type && !_lower && !_upper) 3856 return true; 3857 3858 if (_port) 3859 return (_port == tsk->portid); 3860 3861 if (_sktype && _sktype != sk->sk_type) 3862 return false; 3863 3864 if (tsk->published) { 3865 p = list_first_entry_or_null(&tsk->publications, 3866 struct publication, binding_sock); 3867 if (p) { 3868 type = p->sr.type; 3869 lower = p->sr.lower; 3870 upper = p->sr.upper; 3871 } 3872 } 3873 3874 if (!tipc_sk_type_connectionless(sk)) { 3875 type = msg_nametype(&tsk->phdr); 3876 lower = msg_nameinst(&tsk->phdr); 3877 upper = lower; 3878 } 3879 3880 if ((_type && _type != type) || (_lower && _lower != lower) || 3881 (_upper && _upper != upper)) 3882 return false; 3883 3884 return true; 3885 } 3886 3887 u32 tipc_sock_get_portid(struct sock *sk) 3888 { 3889 return (sk) ? (tipc_sk(sk))->portid : 0; 3890 } 3891 3892 /** 3893 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3894 * both the rcv and backlog queues are considered 3895 * @sk: tipc sk to be checked 3896 * @skb: tipc msg to be checked 3897 * 3898 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3899 */ 3900 3901 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3902 { 3903 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3904 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3905 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3906 3907 return (qsize > lim * 90 / 100); 3908 } 3909 3910 /** 3911 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3912 * only the rcv queue is considered 3913 * @sk: tipc sk to be checked 3914 * @skb: tipc msg to be checked 3915 * 3916 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3917 */ 3918 3919 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3920 { 3921 unsigned int lim = rcvbuf_limit(sk, skb); 3922 unsigned int qsize = sk_rmem_alloc_get(sk); 3923 3924 return (qsize > lim * 90 / 100); 3925 } 3926 3927 /** 3928 * tipc_sk_dump - dump TIPC socket 3929 * @sk: tipc sk to be dumped 3930 * @dqueues: bitmask to decide if any socket queue to be dumped? 3931 * - TIPC_DUMP_NONE: don't dump socket queues 3932 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3933 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3934 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3935 * - TIPC_DUMP_ALL: dump all the socket queues above 3936 * @buf: returned buffer of dump data in format 3937 */ 3938 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3939 { 3940 int i = 0; 3941 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3942 u32 conn_type, conn_instance; 3943 struct tipc_sock *tsk; 3944 struct publication *p; 3945 bool tsk_connected; 3946 3947 if (!sk) { 3948 i += scnprintf(buf, sz, "sk data: (null)\n"); 3949 return i; 3950 } 3951 3952 tsk = tipc_sk(sk); 3953 tsk_connected = !tipc_sk_type_connectionless(sk); 3954 3955 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3956 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3957 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3958 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3959 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3960 if (tsk_connected) { 3961 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3962 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3963 conn_type = msg_nametype(&tsk->phdr); 3964 conn_instance = msg_nameinst(&tsk->phdr); 3965 i += scnprintf(buf + i, sz - i, " %u", conn_type); 3966 i += scnprintf(buf + i, sz - i, " %u", conn_instance); 3967 } 3968 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3969 if (tsk->published) { 3970 p = list_first_entry_or_null(&tsk->publications, 3971 struct publication, binding_sock); 3972 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0); 3973 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0); 3974 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0); 3975 } 3976 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3977 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3978 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3979 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3980 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3981 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3982 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3983 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3984 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3985 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3986 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3987 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3988 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3989 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 3990 3991 if (dqueues & TIPC_DUMP_SK_SNDQ) { 3992 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 3993 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 3994 } 3995 3996 if (dqueues & TIPC_DUMP_SK_RCVQ) { 3997 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 3998 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 3999 } 4000 4001 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 4002 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 4003 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 4004 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 4005 i += scnprintf(buf + i, sz - i, " tail "); 4006 i += tipc_skb_dump(sk->sk_backlog.tail, false, 4007 buf + i); 4008 } 4009 } 4010 4011 return i; 4012 } 4013