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 * @blocking_link: address of the congested link we are currently sleeping on 84 * @pub_count: total # of publications port has made during its lifetime 85 * @conn_timeout: the time we can wait for an unresponded setup request 86 * @probe_unacked: probe has not received ack yet 87 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue 88 * @cong_link_cnt: number of congested links 89 * @snt_unacked: # messages sent by socket, and not yet acked by peer 90 * @snd_win: send window size 91 * @peer_caps: peer capabilities mask 92 * @rcv_unacked: # messages read by user, but not yet acked back to peer 93 * @rcv_win: receive window size 94 * @peer: 'connected' peer for dgram/rdm 95 * @node: hash table node 96 * @mc_method: cookie for use between socket and broadcast layer 97 * @rcu: rcu struct for tipc_sock 98 * @group: TIPC communications group 99 * @oneway: message count in one direction (FIXME) 100 * @nagle_start: current nagle value 101 * @snd_backlog: send backlog count 102 * @msg_acc: messages accepted; used in managing backlog and nagle 103 * @pkt_cnt: TIPC socket packet count 104 * @expect_ack: whether this TIPC socket is expecting an ack 105 * @nodelay: setsockopt() TIPC_NODELAY setting 106 * @group_is_open: TIPC socket group is fully open (FIXME) 107 * @published: true if port has one or more associated names 108 * @conn_addrtype: address type used when establishing connection 109 */ 110 struct tipc_sock { 111 struct sock sk; 112 u32 max_pkt; 113 u32 maxnagle; 114 u32 portid; 115 struct tipc_msg phdr; 116 struct list_head cong_links; 117 struct list_head publications; 118 u32 pub_count; 119 atomic_t dupl_rcvcnt; 120 u16 conn_timeout; 121 bool probe_unacked; 122 u16 cong_link_cnt; 123 u16 snt_unacked; 124 u16 snd_win; 125 u16 peer_caps; 126 u16 rcv_unacked; 127 u16 rcv_win; 128 struct sockaddr_tipc peer; 129 struct rhash_head node; 130 struct tipc_mc_method mc_method; 131 struct rcu_head rcu; 132 struct tipc_group *group; 133 u32 oneway; 134 u32 nagle_start; 135 u16 snd_backlog; 136 u16 msg_acc; 137 u16 pkt_cnt; 138 bool expect_ack; 139 bool nodelay; 140 bool group_is_open; 141 bool published; 142 u8 conn_addrtype; 143 }; 144 145 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); 146 static void tipc_data_ready(struct sock *sk); 147 static void tipc_write_space(struct sock *sk); 148 static void tipc_sock_destruct(struct sock *sk); 149 static int tipc_release(struct socket *sock); 150 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 151 bool kern); 152 static void tipc_sk_timeout(struct timer_list *t); 153 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua); 154 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua); 155 static int tipc_sk_leave(struct tipc_sock *tsk); 156 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); 157 static int tipc_sk_insert(struct tipc_sock *tsk); 158 static void tipc_sk_remove(struct tipc_sock *tsk); 159 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz); 160 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); 161 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack); 162 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p); 163 164 static const struct proto_ops packet_ops; 165 static const struct proto_ops stream_ops; 166 static const struct proto_ops msg_ops; 167 static struct proto tipc_proto; 168 static const struct rhashtable_params tsk_rht_params; 169 170 static u32 tsk_own_node(struct tipc_sock *tsk) 171 { 172 return msg_prevnode(&tsk->phdr); 173 } 174 175 static u32 tsk_peer_node(struct tipc_sock *tsk) 176 { 177 return msg_destnode(&tsk->phdr); 178 } 179 180 static u32 tsk_peer_port(struct tipc_sock *tsk) 181 { 182 return msg_destport(&tsk->phdr); 183 } 184 185 static bool tsk_unreliable(struct tipc_sock *tsk) 186 { 187 return msg_src_droppable(&tsk->phdr) != 0; 188 } 189 190 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) 191 { 192 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); 193 } 194 195 static bool tsk_unreturnable(struct tipc_sock *tsk) 196 { 197 return msg_dest_droppable(&tsk->phdr) != 0; 198 } 199 200 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) 201 { 202 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); 203 } 204 205 static int tsk_importance(struct tipc_sock *tsk) 206 { 207 return msg_importance(&tsk->phdr); 208 } 209 210 static struct tipc_sock *tipc_sk(const struct sock *sk) 211 { 212 return container_of(sk, struct tipc_sock, sk); 213 } 214 215 int tsk_set_importance(struct sock *sk, int imp) 216 { 217 if (imp > TIPC_CRITICAL_IMPORTANCE) 218 return -EINVAL; 219 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp); 220 return 0; 221 } 222 223 static bool tsk_conn_cong(struct tipc_sock *tsk) 224 { 225 return tsk->snt_unacked > tsk->snd_win; 226 } 227 228 static u16 tsk_blocks(int len) 229 { 230 return ((len / FLOWCTL_BLK_SZ) + 1); 231 } 232 233 /* tsk_blocks(): translate a buffer size in bytes to number of 234 * advertisable blocks, taking into account the ratio truesize(len)/len 235 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ 236 */ 237 static u16 tsk_adv_blocks(int len) 238 { 239 return len / FLOWCTL_BLK_SZ / 4; 240 } 241 242 /* tsk_inc(): increment counter for sent or received data 243 * - If block based flow control is not supported by peer we 244 * fall back to message based ditto, incrementing the counter 245 */ 246 static u16 tsk_inc(struct tipc_sock *tsk, int msglen) 247 { 248 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 249 return ((msglen / FLOWCTL_BLK_SZ) + 1); 250 return 1; 251 } 252 253 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle 254 */ 255 static void tsk_set_nagle(struct tipc_sock *tsk) 256 { 257 struct sock *sk = &tsk->sk; 258 259 tsk->maxnagle = 0; 260 if (sk->sk_type != SOCK_STREAM) 261 return; 262 if (tsk->nodelay) 263 return; 264 if (!(tsk->peer_caps & TIPC_NAGLE)) 265 return; 266 /* Limit node local buffer size to avoid receive queue overflow */ 267 if (tsk->max_pkt == MAX_MSG_SIZE) 268 tsk->maxnagle = 1500; 269 else 270 tsk->maxnagle = tsk->max_pkt; 271 } 272 273 /** 274 * tsk_advance_rx_queue - discard first buffer in socket receive queue 275 * @sk: network socket 276 * 277 * Caller must hold socket lock 278 */ 279 static void tsk_advance_rx_queue(struct sock *sk) 280 { 281 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " "); 282 kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); 283 } 284 285 /* tipc_sk_respond() : send response message back to sender 286 */ 287 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) 288 { 289 u32 selector; 290 u32 dnode; 291 u32 onode = tipc_own_addr(sock_net(sk)); 292 293 if (!tipc_msg_reverse(onode, &skb, err)) 294 return; 295 296 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!"); 297 dnode = msg_destnode(buf_msg(skb)); 298 selector = msg_origport(buf_msg(skb)); 299 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); 300 } 301 302 /** 303 * tsk_rej_rx_queue - reject all buffers in socket receive queue 304 * @sk: network socket 305 * @error: response error code 306 * 307 * Caller must hold socket lock 308 */ 309 static void tsk_rej_rx_queue(struct sock *sk, int error) 310 { 311 struct sk_buff *skb; 312 313 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) 314 tipc_sk_respond(sk, skb, error); 315 } 316 317 static bool tipc_sk_connected(struct sock *sk) 318 { 319 return sk->sk_state == TIPC_ESTABLISHED; 320 } 321 322 /* tipc_sk_type_connectionless - check if the socket is datagram socket 323 * @sk: socket 324 * 325 * Returns true if connection less, false otherwise 326 */ 327 static bool tipc_sk_type_connectionless(struct sock *sk) 328 { 329 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM; 330 } 331 332 /* tsk_peer_msg - verify if message was sent by connected port's peer 333 * 334 * Handles cases where the node's network address has changed from 335 * the default of <0.0.0> to its configured setting. 336 */ 337 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) 338 { 339 struct sock *sk = &tsk->sk; 340 u32 self = tipc_own_addr(sock_net(sk)); 341 u32 peer_port = tsk_peer_port(tsk); 342 u32 orig_node, peer_node; 343 344 if (unlikely(!tipc_sk_connected(sk))) 345 return false; 346 347 if (unlikely(msg_origport(msg) != peer_port)) 348 return false; 349 350 orig_node = msg_orignode(msg); 351 peer_node = tsk_peer_node(tsk); 352 353 if (likely(orig_node == peer_node)) 354 return true; 355 356 if (!orig_node && peer_node == self) 357 return true; 358 359 if (!peer_node && orig_node == self) 360 return true; 361 362 return false; 363 } 364 365 /* tipc_set_sk_state - set the sk_state of the socket 366 * @sk: socket 367 * 368 * Caller must hold socket lock 369 * 370 * Returns 0 on success, errno otherwise 371 */ 372 static int tipc_set_sk_state(struct sock *sk, int state) 373 { 374 int oldsk_state = sk->sk_state; 375 int res = -EINVAL; 376 377 switch (state) { 378 case TIPC_OPEN: 379 res = 0; 380 break; 381 case TIPC_LISTEN: 382 case TIPC_CONNECTING: 383 if (oldsk_state == TIPC_OPEN) 384 res = 0; 385 break; 386 case TIPC_ESTABLISHED: 387 if (oldsk_state == TIPC_CONNECTING || 388 oldsk_state == TIPC_OPEN) 389 res = 0; 390 break; 391 case TIPC_DISCONNECTING: 392 if (oldsk_state == TIPC_CONNECTING || 393 oldsk_state == TIPC_ESTABLISHED) 394 res = 0; 395 break; 396 } 397 398 if (!res) 399 sk->sk_state = state; 400 401 return res; 402 } 403 404 static int tipc_sk_sock_err(struct socket *sock, long *timeout) 405 { 406 struct sock *sk = sock->sk; 407 int err = sock_error(sk); 408 int typ = sock->type; 409 410 if (err) 411 return err; 412 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) { 413 if (sk->sk_state == TIPC_DISCONNECTING) 414 return -EPIPE; 415 else if (!tipc_sk_connected(sk)) 416 return -ENOTCONN; 417 } 418 if (!*timeout) 419 return -EAGAIN; 420 if (signal_pending(current)) 421 return sock_intr_errno(*timeout); 422 423 return 0; 424 } 425 426 #define tipc_wait_for_cond(sock_, timeo_, condition_) \ 427 ({ \ 428 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \ 429 struct sock *sk_; \ 430 int rc_; \ 431 \ 432 while ((rc_ = !(condition_))) { \ 433 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \ 434 smp_rmb(); \ 435 sk_ = (sock_)->sk; \ 436 rc_ = tipc_sk_sock_err((sock_), timeo_); \ 437 if (rc_) \ 438 break; \ 439 add_wait_queue(sk_sleep(sk_), &wait_); \ 440 release_sock(sk_); \ 441 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \ 442 sched_annotate_sleep(); \ 443 lock_sock(sk_); \ 444 remove_wait_queue(sk_sleep(sk_), &wait_); \ 445 } \ 446 rc_; \ 447 }) 448 449 /** 450 * tipc_sk_create - create a TIPC socket 451 * @net: network namespace (must be default network) 452 * @sock: pre-allocated socket structure 453 * @protocol: protocol indicator (must be 0) 454 * @kern: caused by kernel or by userspace? 455 * 456 * This routine creates additional data structures used by the TIPC socket, 457 * initializes them, and links them together. 458 * 459 * Return: 0 on success, errno otherwise 460 */ 461 static int tipc_sk_create(struct net *net, struct socket *sock, 462 int protocol, int kern) 463 { 464 const struct proto_ops *ops; 465 struct sock *sk; 466 struct tipc_sock *tsk; 467 struct tipc_msg *msg; 468 469 /* Validate arguments */ 470 if (unlikely(protocol != 0)) 471 return -EPROTONOSUPPORT; 472 473 switch (sock->type) { 474 case SOCK_STREAM: 475 ops = &stream_ops; 476 break; 477 case SOCK_SEQPACKET: 478 ops = &packet_ops; 479 break; 480 case SOCK_DGRAM: 481 case SOCK_RDM: 482 ops = &msg_ops; 483 break; 484 default: 485 return -EPROTOTYPE; 486 } 487 488 /* Allocate socket's protocol area */ 489 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); 490 if (sk == NULL) 491 return -ENOMEM; 492 493 tsk = tipc_sk(sk); 494 tsk->max_pkt = MAX_PKT_DEFAULT; 495 tsk->maxnagle = 0; 496 tsk->nagle_start = NAGLE_START_INIT; 497 INIT_LIST_HEAD(&tsk->publications); 498 INIT_LIST_HEAD(&tsk->cong_links); 499 msg = &tsk->phdr; 500 501 /* Finish initializing socket data structures */ 502 sock->ops = ops; 503 sock_init_data(sock, sk); 504 tipc_set_sk_state(sk, TIPC_OPEN); 505 if (tipc_sk_insert(tsk)) { 506 sk_free(sk); 507 pr_warn("Socket create failed; port number exhausted\n"); 508 return -EINVAL; 509 } 510 511 /* Ensure tsk is visible before we read own_addr. */ 512 smp_mb(); 513 514 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE, 515 TIPC_NAMED_MSG, NAMED_H_SIZE, 0); 516 517 msg_set_origport(msg, tsk->portid); 518 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0); 519 sk->sk_shutdown = 0; 520 sk->sk_backlog_rcv = tipc_sk_backlog_rcv; 521 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]); 522 sk->sk_data_ready = tipc_data_ready; 523 sk->sk_write_space = tipc_write_space; 524 sk->sk_destruct = tipc_sock_destruct; 525 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; 526 tsk->group_is_open = true; 527 atomic_set(&tsk->dupl_rcvcnt, 0); 528 529 /* Start out with safe limits until we receive an advertised window */ 530 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); 531 tsk->rcv_win = tsk->snd_win; 532 533 if (tipc_sk_type_connectionless(sk)) { 534 tsk_set_unreturnable(tsk, true); 535 if (sock->type == SOCK_DGRAM) 536 tsk_set_unreliable(tsk, true); 537 } 538 __skb_queue_head_init(&tsk->mc_method.deferredq); 539 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " "); 540 return 0; 541 } 542 543 static void tipc_sk_callback(struct rcu_head *head) 544 { 545 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); 546 547 sock_put(&tsk->sk); 548 } 549 550 /* Caller should hold socket lock for the socket. */ 551 static void __tipc_shutdown(struct socket *sock, int error) 552 { 553 struct sock *sk = sock->sk; 554 struct tipc_sock *tsk = tipc_sk(sk); 555 struct net *net = sock_net(sk); 556 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT); 557 u32 dnode = tsk_peer_node(tsk); 558 struct sk_buff *skb; 559 560 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */ 561 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt && 562 !tsk_conn_cong(tsk))); 563 564 /* Push out delayed messages if in Nagle mode */ 565 tipc_sk_push_backlog(tsk, false); 566 /* Remove pending SYN */ 567 __skb_queue_purge(&sk->sk_write_queue); 568 569 /* Remove partially received buffer if any */ 570 skb = skb_peek(&sk->sk_receive_queue); 571 if (skb && TIPC_SKB_CB(skb)->bytes_read) { 572 __skb_unlink(skb, &sk->sk_receive_queue); 573 kfree_skb(skb); 574 } 575 576 /* Reject all unreceived messages if connectionless */ 577 if (tipc_sk_type_connectionless(sk)) { 578 tsk_rej_rx_queue(sk, error); 579 return; 580 } 581 582 switch (sk->sk_state) { 583 case TIPC_CONNECTING: 584 case TIPC_ESTABLISHED: 585 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 586 tipc_node_remove_conn(net, dnode, tsk->portid); 587 /* Send a FIN+/- to its peer */ 588 skb = __skb_dequeue(&sk->sk_receive_queue); 589 if (skb) { 590 __skb_queue_purge(&sk->sk_receive_queue); 591 tipc_sk_respond(sk, skb, error); 592 break; 593 } 594 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, 595 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, 596 tsk_own_node(tsk), tsk_peer_port(tsk), 597 tsk->portid, error); 598 if (skb) 599 tipc_node_xmit_skb(net, skb, dnode, tsk->portid); 600 break; 601 case TIPC_LISTEN: 602 /* Reject all SYN messages */ 603 tsk_rej_rx_queue(sk, error); 604 break; 605 default: 606 __skb_queue_purge(&sk->sk_receive_queue); 607 break; 608 } 609 } 610 611 /** 612 * tipc_release - destroy a TIPC socket 613 * @sock: socket to destroy 614 * 615 * This routine cleans up any messages that are still queued on the socket. 616 * For DGRAM and RDM socket types, all queued messages are rejected. 617 * For SEQPACKET and STREAM socket types, the first message is rejected 618 * and any others are discarded. (If the first message on a STREAM socket 619 * is partially-read, it is discarded and the next one is rejected instead.) 620 * 621 * NOTE: Rejected messages are not necessarily returned to the sender! They 622 * are returned or discarded according to the "destination droppable" setting 623 * specified for the message by the sender. 624 * 625 * Return: 0 on success, errno otherwise 626 */ 627 static int tipc_release(struct socket *sock) 628 { 629 struct sock *sk = sock->sk; 630 struct tipc_sock *tsk; 631 632 /* 633 * Exit if socket isn't fully initialized (occurs when a failed accept() 634 * releases a pre-allocated child socket that was never used) 635 */ 636 if (sk == NULL) 637 return 0; 638 639 tsk = tipc_sk(sk); 640 lock_sock(sk); 641 642 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " "); 643 __tipc_shutdown(sock, TIPC_ERR_NO_PORT); 644 sk->sk_shutdown = SHUTDOWN_MASK; 645 tipc_sk_leave(tsk); 646 tipc_sk_withdraw(tsk, NULL); 647 __skb_queue_purge(&tsk->mc_method.deferredq); 648 sk_stop_timer(sk, &sk->sk_timer); 649 tipc_sk_remove(tsk); 650 651 sock_orphan(sk); 652 /* Reject any messages that accumulated in backlog queue */ 653 release_sock(sk); 654 tipc_dest_list_purge(&tsk->cong_links); 655 tsk->cong_link_cnt = 0; 656 call_rcu(&tsk->rcu, tipc_sk_callback); 657 sock->sk = NULL; 658 659 return 0; 660 } 661 662 /** 663 * __tipc_bind - associate or disassocate TIPC name(s) with a socket 664 * @sock: socket structure 665 * @skaddr: socket address describing name(s) and desired operation 666 * @alen: size of socket address data structure 667 * 668 * Name and name sequence binding are indicated using a positive scope value; 669 * a negative scope value unbinds the specified name. Specifying no name 670 * (i.e. a socket address length of 0) unbinds all names from the socket. 671 * 672 * Return: 0 on success, errno otherwise 673 * 674 * NOTE: This routine doesn't need to take the socket lock since it doesn't 675 * access any non-constant socket information. 676 */ 677 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 678 { 679 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 680 struct tipc_sock *tsk = tipc_sk(sock->sk); 681 bool unbind = false; 682 683 if (unlikely(!alen)) 684 return tipc_sk_withdraw(tsk, NULL); 685 686 if (ua->addrtype == TIPC_SERVICE_ADDR) { 687 ua->addrtype = TIPC_SERVICE_RANGE; 688 ua->sr.upper = ua->sr.lower; 689 } 690 if (ua->scope < 0) { 691 unbind = true; 692 ua->scope = -ua->scope; 693 } 694 /* Users may still use deprecated TIPC_ZONE_SCOPE */ 695 if (ua->scope != TIPC_NODE_SCOPE) 696 ua->scope = TIPC_CLUSTER_SCOPE; 697 698 if (tsk->group) 699 return -EACCES; 700 701 if (unbind) 702 return tipc_sk_withdraw(tsk, ua); 703 return tipc_sk_publish(tsk, ua); 704 } 705 706 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 707 { 708 int res; 709 710 lock_sock(sock->sk); 711 res = __tipc_bind(sock, skaddr, alen); 712 release_sock(sock->sk); 713 return res; 714 } 715 716 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen) 717 { 718 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr; 719 u32 atype = ua->addrtype; 720 721 if (alen) { 722 if (!tipc_uaddr_valid(ua, alen)) 723 return -EINVAL; 724 if (atype == TIPC_SOCKET_ADDR) 725 return -EAFNOSUPPORT; 726 if (ua->sr.type < TIPC_RESERVED_TYPES) { 727 pr_warn_once("Can't bind to reserved service type %u\n", 728 ua->sr.type); 729 return -EACCES; 730 } 731 } 732 return tipc_sk_bind(sock, skaddr, alen); 733 } 734 735 /** 736 * tipc_getname - get port ID of socket or peer socket 737 * @sock: socket structure 738 * @uaddr: area for returned socket address 739 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID 740 * 741 * Return: 0 on success, errno otherwise 742 * 743 * NOTE: This routine doesn't need to take the socket lock since it only 744 * accesses socket information that is unchanging (or which changes in 745 * a completely predictable manner). 746 */ 747 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, 748 int peer) 749 { 750 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; 751 struct sock *sk = sock->sk; 752 struct tipc_sock *tsk = tipc_sk(sk); 753 754 memset(addr, 0, sizeof(*addr)); 755 if (peer) { 756 if ((!tipc_sk_connected(sk)) && 757 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING))) 758 return -ENOTCONN; 759 addr->addr.id.ref = tsk_peer_port(tsk); 760 addr->addr.id.node = tsk_peer_node(tsk); 761 } else { 762 addr->addr.id.ref = tsk->portid; 763 addr->addr.id.node = tipc_own_addr(sock_net(sk)); 764 } 765 766 addr->addrtype = TIPC_SOCKET_ADDR; 767 addr->family = AF_TIPC; 768 addr->scope = 0; 769 addr->addr.name.domain = 0; 770 771 return sizeof(*addr); 772 } 773 774 /** 775 * tipc_poll - read and possibly block on pollmask 776 * @file: file structure associated with the socket 777 * @sock: socket for which to calculate the poll bits 778 * @wait: ??? 779 * 780 * Return: pollmask value 781 * 782 * COMMENTARY: 783 * It appears that the usual socket locking mechanisms are not useful here 784 * since the pollmask info is potentially out-of-date the moment this routine 785 * exits. TCP and other protocols seem to rely on higher level poll routines 786 * to handle any preventable race conditions, so TIPC will do the same ... 787 * 788 * IMPORTANT: The fact that a read or write operation is indicated does NOT 789 * imply that the operation will succeed, merely that it should be performed 790 * and will not block. 791 */ 792 static __poll_t tipc_poll(struct file *file, struct socket *sock, 793 poll_table *wait) 794 { 795 struct sock *sk = sock->sk; 796 struct tipc_sock *tsk = tipc_sk(sk); 797 __poll_t revents = 0; 798 799 sock_poll_wait(file, sock, wait); 800 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " "); 801 802 if (sk->sk_shutdown & RCV_SHUTDOWN) 803 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; 804 if (sk->sk_shutdown == SHUTDOWN_MASK) 805 revents |= EPOLLHUP; 806 807 switch (sk->sk_state) { 808 case TIPC_ESTABLISHED: 809 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk)) 810 revents |= EPOLLOUT; 811 fallthrough; 812 case TIPC_LISTEN: 813 case TIPC_CONNECTING: 814 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 815 revents |= EPOLLIN | EPOLLRDNORM; 816 break; 817 case TIPC_OPEN: 818 if (tsk->group_is_open && !tsk->cong_link_cnt) 819 revents |= EPOLLOUT; 820 if (!tipc_sk_type_connectionless(sk)) 821 break; 822 if (skb_queue_empty_lockless(&sk->sk_receive_queue)) 823 break; 824 revents |= EPOLLIN | EPOLLRDNORM; 825 break; 826 case TIPC_DISCONNECTING: 827 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP; 828 break; 829 } 830 return revents; 831 } 832 833 /** 834 * tipc_sendmcast - send multicast message 835 * @sock: socket structure 836 * @ua: destination address struct 837 * @msg: message to send 838 * @dlen: length of data to send 839 * @timeout: timeout to wait for wakeup 840 * 841 * Called from function tipc_sendmsg(), which has done all sanity checks 842 * Return: the number of bytes sent on success, or errno 843 */ 844 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua, 845 struct msghdr *msg, size_t dlen, long timeout) 846 { 847 struct sock *sk = sock->sk; 848 struct tipc_sock *tsk = tipc_sk(sk); 849 struct tipc_msg *hdr = &tsk->phdr; 850 struct net *net = sock_net(sk); 851 int mtu = tipc_bcast_get_mtu(net); 852 struct sk_buff_head pkts; 853 struct tipc_nlist dsts; 854 int rc; 855 856 if (tsk->group) 857 return -EACCES; 858 859 /* Block or return if any destination link is congested */ 860 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt); 861 if (unlikely(rc)) 862 return rc; 863 864 /* Lookup destination nodes */ 865 tipc_nlist_init(&dsts, tipc_own_addr(net)); 866 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts); 867 if (!dsts.local && !dsts.remote) 868 return -EHOSTUNREACH; 869 870 /* Build message header */ 871 msg_set_type(hdr, TIPC_MCAST_MSG); 872 msg_set_hdr_sz(hdr, MCAST_H_SIZE); 873 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE); 874 msg_set_destport(hdr, 0); 875 msg_set_destnode(hdr, 0); 876 msg_set_nametype(hdr, ua->sr.type); 877 msg_set_namelower(hdr, ua->sr.lower); 878 msg_set_nameupper(hdr, ua->sr.upper); 879 880 /* Build message as chain of buffers */ 881 __skb_queue_head_init(&pkts); 882 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts); 883 884 /* Send message if build was successful */ 885 if (unlikely(rc == dlen)) { 886 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts), 887 TIPC_DUMP_SK_SNDQ, " "); 888 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts, 889 &tsk->cong_link_cnt); 890 } 891 892 tipc_nlist_purge(&dsts); 893 894 return rc ? rc : dlen; 895 } 896 897 /** 898 * tipc_send_group_msg - send a message to a member in the group 899 * @net: network namespace 900 * @tsk: tipc socket 901 * @m: message to send 902 * @mb: group member 903 * @dnode: destination node 904 * @dport: destination port 905 * @dlen: total length of message data 906 */ 907 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk, 908 struct msghdr *m, struct tipc_member *mb, 909 u32 dnode, u32 dport, int dlen) 910 { 911 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group); 912 struct tipc_mc_method *method = &tsk->mc_method; 913 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 914 struct tipc_msg *hdr = &tsk->phdr; 915 struct sk_buff_head pkts; 916 int mtu, rc; 917 918 /* Complete message header */ 919 msg_set_type(hdr, TIPC_GRP_UCAST_MSG); 920 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 921 msg_set_destport(hdr, dport); 922 msg_set_destnode(hdr, dnode); 923 msg_set_grp_bc_seqno(hdr, bc_snd_nxt); 924 925 /* Build message as chain of buffers */ 926 __skb_queue_head_init(&pkts); 927 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false); 928 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 929 if (unlikely(rc != dlen)) 930 return rc; 931 932 /* Send message */ 933 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid); 934 if (unlikely(rc == -ELINKCONG)) { 935 tipc_dest_push(&tsk->cong_links, dnode, 0); 936 tsk->cong_link_cnt++; 937 } 938 939 /* Update send window */ 940 tipc_group_update_member(mb, blks); 941 942 /* A broadcast sent within next EXPIRE period must follow same path */ 943 method->rcast = true; 944 method->mandatory = true; 945 return dlen; 946 } 947 948 /** 949 * tipc_send_group_unicast - send message to a member in the group 950 * @sock: socket structure 951 * @m: message to send 952 * @dlen: total length of message data 953 * @timeout: timeout to wait for wakeup 954 * 955 * Called from function tipc_sendmsg(), which has done all sanity checks 956 * Return: the number of bytes sent on success, or errno 957 */ 958 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m, 959 int dlen, long timeout) 960 { 961 struct sock *sk = sock->sk; 962 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 963 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 964 struct tipc_sock *tsk = tipc_sk(sk); 965 struct net *net = sock_net(sk); 966 struct tipc_member *mb = NULL; 967 u32 node, port; 968 int rc; 969 970 node = ua->sk.node; 971 port = ua->sk.ref; 972 if (!port && !node) 973 return -EHOSTUNREACH; 974 975 /* Block or return if destination link or member is congested */ 976 rc = tipc_wait_for_cond(sock, &timeout, 977 !tipc_dest_find(&tsk->cong_links, node, 0) && 978 tsk->group && 979 !tipc_group_cong(tsk->group, node, port, blks, 980 &mb)); 981 if (unlikely(rc)) 982 return rc; 983 984 if (unlikely(!mb)) 985 return -EHOSTUNREACH; 986 987 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen); 988 989 return rc ? rc : dlen; 990 } 991 992 /** 993 * tipc_send_group_anycast - send message to any member with given identity 994 * @sock: socket structure 995 * @m: message to send 996 * @dlen: total length of message data 997 * @timeout: timeout to wait for wakeup 998 * 999 * Called from function tipc_sendmsg(), which has done all sanity checks 1000 * Return: the number of bytes sent on success, or errno 1001 */ 1002 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m, 1003 int dlen, long timeout) 1004 { 1005 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1006 struct sock *sk = sock->sk; 1007 struct tipc_sock *tsk = tipc_sk(sk); 1008 struct list_head *cong_links = &tsk->cong_links; 1009 int blks = tsk_blocks(GROUP_H_SIZE + dlen); 1010 struct tipc_msg *hdr = &tsk->phdr; 1011 struct tipc_member *first = NULL; 1012 struct tipc_member *mbr = NULL; 1013 struct net *net = sock_net(sk); 1014 u32 node, port, exclude; 1015 struct list_head dsts; 1016 int lookups = 0; 1017 int dstcnt, rc; 1018 bool cong; 1019 1020 INIT_LIST_HEAD(&dsts); 1021 ua->sa.type = msg_nametype(hdr); 1022 ua->scope = msg_lookup_scope(hdr); 1023 1024 while (++lookups < 4) { 1025 exclude = tipc_group_exclude(tsk->group); 1026 1027 first = NULL; 1028 1029 /* Look for a non-congested destination member, if any */ 1030 while (1) { 1031 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, 1032 exclude, false)) 1033 return -EHOSTUNREACH; 1034 tipc_dest_pop(&dsts, &node, &port); 1035 cong = tipc_group_cong(tsk->group, node, port, blks, 1036 &mbr); 1037 if (!cong) 1038 break; 1039 if (mbr == first) 1040 break; 1041 if (!first) 1042 first = mbr; 1043 } 1044 1045 /* Start over if destination was not in member list */ 1046 if (unlikely(!mbr)) 1047 continue; 1048 1049 if (likely(!cong && !tipc_dest_find(cong_links, node, 0))) 1050 break; 1051 1052 /* Block or return if destination link or member is congested */ 1053 rc = tipc_wait_for_cond(sock, &timeout, 1054 !tipc_dest_find(cong_links, node, 0) && 1055 tsk->group && 1056 !tipc_group_cong(tsk->group, node, port, 1057 blks, &mbr)); 1058 if (unlikely(rc)) 1059 return rc; 1060 1061 /* Send, unless destination disappeared while waiting */ 1062 if (likely(mbr)) 1063 break; 1064 } 1065 1066 if (unlikely(lookups >= 4)) 1067 return -EHOSTUNREACH; 1068 1069 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen); 1070 1071 return rc ? rc : dlen; 1072 } 1073 1074 /** 1075 * tipc_send_group_bcast - send message to all members in communication group 1076 * @sock: socket structure 1077 * @m: message to send 1078 * @dlen: total length of message data 1079 * @timeout: timeout to wait for wakeup 1080 * 1081 * Called from function tipc_sendmsg(), which has done all sanity checks 1082 * Return: the number of bytes sent on success, or errno 1083 */ 1084 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m, 1085 int dlen, long timeout) 1086 { 1087 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1088 struct sock *sk = sock->sk; 1089 struct net *net = sock_net(sk); 1090 struct tipc_sock *tsk = tipc_sk(sk); 1091 struct tipc_nlist *dsts; 1092 struct tipc_mc_method *method = &tsk->mc_method; 1093 bool ack = method->mandatory && method->rcast; 1094 int blks = tsk_blocks(MCAST_H_SIZE + dlen); 1095 struct tipc_msg *hdr = &tsk->phdr; 1096 int mtu = tipc_bcast_get_mtu(net); 1097 struct sk_buff_head pkts; 1098 int rc = -EHOSTUNREACH; 1099 1100 /* Block or return if any destination link or member is congested */ 1101 rc = tipc_wait_for_cond(sock, &timeout, 1102 !tsk->cong_link_cnt && tsk->group && 1103 !tipc_group_bc_cong(tsk->group, blks)); 1104 if (unlikely(rc)) 1105 return rc; 1106 1107 dsts = tipc_group_dests(tsk->group); 1108 if (!dsts->local && !dsts->remote) 1109 return -EHOSTUNREACH; 1110 1111 /* Complete message header */ 1112 if (ua) { 1113 msg_set_type(hdr, TIPC_GRP_MCAST_MSG); 1114 msg_set_nameinst(hdr, ua->sa.instance); 1115 } else { 1116 msg_set_type(hdr, TIPC_GRP_BCAST_MSG); 1117 msg_set_nameinst(hdr, 0); 1118 } 1119 msg_set_hdr_sz(hdr, GROUP_H_SIZE); 1120 msg_set_destport(hdr, 0); 1121 msg_set_destnode(hdr, 0); 1122 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group)); 1123 1124 /* Avoid getting stuck with repeated forced replicasts */ 1125 msg_set_grp_bc_ack_req(hdr, ack); 1126 1127 /* Build message as chain of buffers */ 1128 __skb_queue_head_init(&pkts); 1129 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1130 if (unlikely(rc != dlen)) 1131 return rc; 1132 1133 /* Send message */ 1134 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt); 1135 if (unlikely(rc)) 1136 return rc; 1137 1138 /* Update broadcast sequence number and send windows */ 1139 tipc_group_update_bc_members(tsk->group, blks, ack); 1140 1141 /* Broadcast link is now free to choose method for next broadcast */ 1142 method->mandatory = false; 1143 method->expires = jiffies; 1144 1145 return dlen; 1146 } 1147 1148 /** 1149 * tipc_send_group_mcast - send message to all members with given identity 1150 * @sock: socket structure 1151 * @m: message to send 1152 * @dlen: total length of message data 1153 * @timeout: timeout to wait for wakeup 1154 * 1155 * Called from function tipc_sendmsg(), which has done all sanity checks 1156 * Return: the number of bytes sent on success, or errno 1157 */ 1158 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m, 1159 int dlen, long timeout) 1160 { 1161 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1162 struct sock *sk = sock->sk; 1163 struct tipc_sock *tsk = tipc_sk(sk); 1164 struct tipc_group *grp = tsk->group; 1165 struct tipc_msg *hdr = &tsk->phdr; 1166 struct net *net = sock_net(sk); 1167 struct list_head dsts; 1168 u32 dstcnt, exclude; 1169 1170 INIT_LIST_HEAD(&dsts); 1171 ua->sa.type = msg_nametype(hdr); 1172 ua->scope = msg_lookup_scope(hdr); 1173 exclude = tipc_group_exclude(grp); 1174 1175 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true)) 1176 return -EHOSTUNREACH; 1177 1178 if (dstcnt == 1) { 1179 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref); 1180 return tipc_send_group_unicast(sock, m, dlen, timeout); 1181 } 1182 1183 tipc_dest_list_purge(&dsts); 1184 return tipc_send_group_bcast(sock, m, dlen, timeout); 1185 } 1186 1187 /** 1188 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets 1189 * @net: the associated network namespace 1190 * @arrvq: queue with arriving messages, to be cloned after destination lookup 1191 * @inputq: queue with cloned messages, delivered to socket after dest lookup 1192 * 1193 * Multi-threaded: parallel calls with reference to same queues may occur 1194 */ 1195 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, 1196 struct sk_buff_head *inputq) 1197 { 1198 u32 self = tipc_own_addr(net); 1199 struct sk_buff *skb, *_skb; 1200 u32 portid, onode; 1201 struct sk_buff_head tmpq; 1202 struct list_head dports; 1203 struct tipc_msg *hdr; 1204 struct tipc_uaddr ua; 1205 int user, mtyp, hlen; 1206 1207 __skb_queue_head_init(&tmpq); 1208 INIT_LIST_HEAD(&dports); 1209 ua.addrtype = TIPC_SERVICE_RANGE; 1210 1211 /* tipc_skb_peek() increments the head skb's reference counter */ 1212 skb = tipc_skb_peek(arrvq, &inputq->lock); 1213 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { 1214 hdr = buf_msg(skb); 1215 user = msg_user(hdr); 1216 mtyp = msg_type(hdr); 1217 hlen = skb_headroom(skb) + msg_hdr_sz(hdr); 1218 onode = msg_orignode(hdr); 1219 ua.sr.type = msg_nametype(hdr); 1220 ua.sr.lower = msg_namelower(hdr); 1221 ua.sr.upper = msg_nameupper(hdr); 1222 if (onode == self) 1223 ua.scope = TIPC_ANY_SCOPE; 1224 else 1225 ua.scope = TIPC_CLUSTER_SCOPE; 1226 1227 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) { 1228 spin_lock_bh(&inputq->lock); 1229 if (skb_peek(arrvq) == skb) { 1230 __skb_dequeue(arrvq); 1231 __skb_queue_tail(inputq, skb); 1232 } 1233 kfree_skb(skb); 1234 spin_unlock_bh(&inputq->lock); 1235 continue; 1236 } 1237 1238 /* Group messages require exact scope match */ 1239 if (msg_in_group(hdr)) { 1240 ua.sr.lower = 0; 1241 ua.sr.upper = ~0; 1242 ua.scope = msg_lookup_scope(hdr); 1243 } 1244 1245 /* Create destination port list: */ 1246 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports); 1247 1248 /* Clone message per destination */ 1249 while (tipc_dest_pop(&dports, NULL, &portid)) { 1250 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC); 1251 if (_skb) { 1252 msg_set_destport(buf_msg(_skb), portid); 1253 __skb_queue_tail(&tmpq, _skb); 1254 continue; 1255 } 1256 pr_warn("Failed to clone mcast rcv buffer\n"); 1257 } 1258 /* Append clones to inputq only if skb is still head of arrvq */ 1259 spin_lock_bh(&inputq->lock); 1260 if (skb_peek(arrvq) == skb) { 1261 skb_queue_splice_tail_init(&tmpq, inputq); 1262 /* Decrement the skb's refcnt */ 1263 kfree_skb(__skb_dequeue(arrvq)); 1264 } 1265 spin_unlock_bh(&inputq->lock); 1266 __skb_queue_purge(&tmpq); 1267 kfree_skb(skb); 1268 } 1269 tipc_sk_rcv(net, inputq); 1270 } 1271 1272 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue 1273 * when socket is in Nagle mode 1274 */ 1275 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack) 1276 { 1277 struct sk_buff_head *txq = &tsk->sk.sk_write_queue; 1278 struct sk_buff *skb = skb_peek_tail(txq); 1279 struct net *net = sock_net(&tsk->sk); 1280 u32 dnode = tsk_peer_node(tsk); 1281 int rc; 1282 1283 if (nagle_ack) { 1284 tsk->pkt_cnt += skb_queue_len(txq); 1285 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) { 1286 tsk->oneway = 0; 1287 if (tsk->nagle_start < NAGLE_START_MAX) 1288 tsk->nagle_start *= 2; 1289 tsk->expect_ack = false; 1290 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n", 1291 tsk->portid, tsk->msg_acc, tsk->pkt_cnt, 1292 tsk->nagle_start); 1293 } else { 1294 tsk->nagle_start = NAGLE_START_INIT; 1295 if (skb) { 1296 msg_set_ack_required(buf_msg(skb)); 1297 tsk->expect_ack = true; 1298 } else { 1299 tsk->expect_ack = false; 1300 } 1301 } 1302 tsk->msg_acc = 0; 1303 tsk->pkt_cnt = 0; 1304 } 1305 1306 if (!skb || tsk->cong_link_cnt) 1307 return; 1308 1309 /* Do not send SYN again after congestion */ 1310 if (msg_is_syn(buf_msg(skb))) 1311 return; 1312 1313 if (tsk->msg_acc) 1314 tsk->pkt_cnt += skb_queue_len(txq); 1315 tsk->snt_unacked += tsk->snd_backlog; 1316 tsk->snd_backlog = 0; 1317 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1318 if (rc == -ELINKCONG) 1319 tsk->cong_link_cnt = 1; 1320 } 1321 1322 /** 1323 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message 1324 * @tsk: receiving socket 1325 * @skb: pointer to message buffer. 1326 * @inputq: buffer list containing the buffers 1327 * @xmitq: output message area 1328 */ 1329 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb, 1330 struct sk_buff_head *inputq, 1331 struct sk_buff_head *xmitq) 1332 { 1333 struct tipc_msg *hdr = buf_msg(skb); 1334 u32 onode = tsk_own_node(tsk); 1335 struct sock *sk = &tsk->sk; 1336 int mtyp = msg_type(hdr); 1337 bool was_cong; 1338 1339 /* Ignore if connection cannot be validated: */ 1340 if (!tsk_peer_msg(tsk, hdr)) { 1341 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!"); 1342 goto exit; 1343 } 1344 1345 if (unlikely(msg_errcode(hdr))) { 1346 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 1347 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), 1348 tsk_peer_port(tsk)); 1349 sk->sk_state_change(sk); 1350 1351 /* State change is ignored if socket already awake, 1352 * - convert msg to abort msg and add to inqueue 1353 */ 1354 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE); 1355 msg_set_type(hdr, TIPC_CONN_MSG); 1356 msg_set_size(hdr, BASIC_H_SIZE); 1357 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1358 __skb_queue_tail(inputq, skb); 1359 return; 1360 } 1361 1362 tsk->probe_unacked = false; 1363 1364 if (mtyp == CONN_PROBE) { 1365 msg_set_type(hdr, CONN_PROBE_REPLY); 1366 if (tipc_msg_reverse(onode, &skb, TIPC_OK)) 1367 __skb_queue_tail(xmitq, skb); 1368 return; 1369 } else if (mtyp == CONN_ACK) { 1370 was_cong = tsk_conn_cong(tsk); 1371 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr)); 1372 tsk->snt_unacked -= msg_conn_ack(hdr); 1373 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1374 tsk->snd_win = msg_adv_win(hdr); 1375 if (was_cong && !tsk_conn_cong(tsk)) 1376 sk->sk_write_space(sk); 1377 } else if (mtyp != CONN_PROBE_REPLY) { 1378 pr_warn("Received unknown CONN_PROTO msg\n"); 1379 } 1380 exit: 1381 kfree_skb(skb); 1382 } 1383 1384 /** 1385 * tipc_sendmsg - send message in connectionless manner 1386 * @sock: socket structure 1387 * @m: message to send 1388 * @dsz: amount of user data to be sent 1389 * 1390 * Message must have an destination specified explicitly. 1391 * Used for SOCK_RDM and SOCK_DGRAM messages, 1392 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. 1393 * (Note: 'SYN+' is prohibited on SOCK_STREAM.) 1394 * 1395 * Return: the number of bytes sent on success, or errno otherwise 1396 */ 1397 static int tipc_sendmsg(struct socket *sock, 1398 struct msghdr *m, size_t dsz) 1399 { 1400 struct sock *sk = sock->sk; 1401 int ret; 1402 1403 lock_sock(sk); 1404 ret = __tipc_sendmsg(sock, m, dsz); 1405 release_sock(sk); 1406 1407 return ret; 1408 } 1409 1410 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) 1411 { 1412 struct sock *sk = sock->sk; 1413 struct net *net = sock_net(sk); 1414 struct tipc_sock *tsk = tipc_sk(sk); 1415 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name; 1416 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1417 struct list_head *clinks = &tsk->cong_links; 1418 bool syn = !tipc_sk_type_connectionless(sk); 1419 struct tipc_group *grp = tsk->group; 1420 struct tipc_msg *hdr = &tsk->phdr; 1421 struct tipc_socket_addr skaddr; 1422 struct sk_buff_head pkts; 1423 int atype, mtu, rc; 1424 1425 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE)) 1426 return -EMSGSIZE; 1427 1428 if (ua) { 1429 if (!tipc_uaddr_valid(ua, m->msg_namelen)) 1430 return -EINVAL; 1431 atype = ua->addrtype; 1432 } 1433 1434 /* If socket belongs to a communication group follow other paths */ 1435 if (grp) { 1436 if (!ua) 1437 return tipc_send_group_bcast(sock, m, dlen, timeout); 1438 if (atype == TIPC_SERVICE_ADDR) 1439 return tipc_send_group_anycast(sock, m, dlen, timeout); 1440 if (atype == TIPC_SOCKET_ADDR) 1441 return tipc_send_group_unicast(sock, m, dlen, timeout); 1442 if (atype == TIPC_SERVICE_RANGE) 1443 return tipc_send_group_mcast(sock, m, dlen, timeout); 1444 return -EINVAL; 1445 } 1446 1447 if (!ua) { 1448 ua = (struct tipc_uaddr *)&tsk->peer; 1449 if (!syn && ua->family != AF_TIPC) 1450 return -EDESTADDRREQ; 1451 atype = ua->addrtype; 1452 } 1453 1454 if (unlikely(syn)) { 1455 if (sk->sk_state == TIPC_LISTEN) 1456 return -EPIPE; 1457 if (sk->sk_state != TIPC_OPEN) 1458 return -EISCONN; 1459 if (tsk->published) 1460 return -EOPNOTSUPP; 1461 if (atype == TIPC_SERVICE_ADDR) 1462 tsk->conn_addrtype = atype; 1463 msg_set_syn(hdr, 1); 1464 } 1465 1466 memset(&skaddr, 0, sizeof(skaddr)); 1467 1468 /* Determine destination */ 1469 if (atype == TIPC_SERVICE_RANGE) { 1470 return tipc_sendmcast(sock, ua, m, dlen, timeout); 1471 } else if (atype == TIPC_SERVICE_ADDR) { 1472 skaddr.node = ua->lookup_node; 1473 ua->scope = tipc_node2scope(skaddr.node); 1474 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr)) 1475 return -EHOSTUNREACH; 1476 } else if (atype == TIPC_SOCKET_ADDR) { 1477 skaddr = ua->sk; 1478 } else { 1479 return -EINVAL; 1480 } 1481 1482 /* Block or return if destination link is congested */ 1483 rc = tipc_wait_for_cond(sock, &timeout, 1484 !tipc_dest_find(clinks, skaddr.node, 0)); 1485 if (unlikely(rc)) 1486 return rc; 1487 1488 /* Finally build message header */ 1489 msg_set_destnode(hdr, skaddr.node); 1490 msg_set_destport(hdr, skaddr.ref); 1491 if (atype == TIPC_SERVICE_ADDR) { 1492 msg_set_type(hdr, TIPC_NAMED_MSG); 1493 msg_set_hdr_sz(hdr, NAMED_H_SIZE); 1494 msg_set_nametype(hdr, ua->sa.type); 1495 msg_set_nameinst(hdr, ua->sa.instance); 1496 msg_set_lookup_scope(hdr, ua->scope); 1497 } else { /* TIPC_SOCKET_ADDR */ 1498 msg_set_type(hdr, TIPC_DIRECT_MSG); 1499 msg_set_lookup_scope(hdr, 0); 1500 msg_set_hdr_sz(hdr, BASIC_H_SIZE); 1501 } 1502 1503 /* Add message body */ 1504 __skb_queue_head_init(&pkts); 1505 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true); 1506 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts); 1507 if (unlikely(rc != dlen)) 1508 return rc; 1509 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) { 1510 __skb_queue_purge(&pkts); 1511 return -ENOMEM; 1512 } 1513 1514 /* Send message */ 1515 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " "); 1516 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid); 1517 if (unlikely(rc == -ELINKCONG)) { 1518 tipc_dest_push(clinks, skaddr.node, 0); 1519 tsk->cong_link_cnt++; 1520 rc = 0; 1521 } 1522 1523 if (unlikely(syn && !rc)) { 1524 tipc_set_sk_state(sk, TIPC_CONNECTING); 1525 if (dlen && timeout) { 1526 timeout = msecs_to_jiffies(timeout); 1527 tipc_wait_for_connect(sock, &timeout); 1528 } 1529 } 1530 1531 return rc ? rc : dlen; 1532 } 1533 1534 /** 1535 * tipc_sendstream - send stream-oriented data 1536 * @sock: socket structure 1537 * @m: data to send 1538 * @dsz: total length of data to be transmitted 1539 * 1540 * Used for SOCK_STREAM data. 1541 * 1542 * Return: the number of bytes sent on success (or partial success), 1543 * or errno if no data sent 1544 */ 1545 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz) 1546 { 1547 struct sock *sk = sock->sk; 1548 int ret; 1549 1550 lock_sock(sk); 1551 ret = __tipc_sendstream(sock, m, dsz); 1552 release_sock(sk); 1553 1554 return ret; 1555 } 1556 1557 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen) 1558 { 1559 struct sock *sk = sock->sk; 1560 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); 1561 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); 1562 struct sk_buff_head *txq = &sk->sk_write_queue; 1563 struct tipc_sock *tsk = tipc_sk(sk); 1564 struct tipc_msg *hdr = &tsk->phdr; 1565 struct net *net = sock_net(sk); 1566 struct sk_buff *skb; 1567 u32 dnode = tsk_peer_node(tsk); 1568 int maxnagle = tsk->maxnagle; 1569 int maxpkt = tsk->max_pkt; 1570 int send, sent = 0; 1571 int blocks, rc = 0; 1572 1573 if (unlikely(dlen > INT_MAX)) 1574 return -EMSGSIZE; 1575 1576 /* Handle implicit connection setup */ 1577 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) { 1578 rc = __tipc_sendmsg(sock, m, dlen); 1579 if (dlen && dlen == rc) { 1580 tsk->peer_caps = tipc_node_get_capabilities(net, dnode); 1581 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr)); 1582 } 1583 return rc; 1584 } 1585 1586 do { 1587 rc = tipc_wait_for_cond(sock, &timeout, 1588 (!tsk->cong_link_cnt && 1589 !tsk_conn_cong(tsk) && 1590 tipc_sk_connected(sk))); 1591 if (unlikely(rc)) 1592 break; 1593 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); 1594 blocks = tsk->snd_backlog; 1595 if (tsk->oneway++ >= tsk->nagle_start && maxnagle && 1596 send <= maxnagle) { 1597 rc = tipc_msg_append(hdr, m, send, maxnagle, txq); 1598 if (unlikely(rc < 0)) 1599 break; 1600 blocks += rc; 1601 tsk->msg_acc++; 1602 if (blocks <= 64 && tsk->expect_ack) { 1603 tsk->snd_backlog = blocks; 1604 sent += send; 1605 break; 1606 } else if (blocks > 64) { 1607 tsk->pkt_cnt += skb_queue_len(txq); 1608 } else { 1609 skb = skb_peek_tail(txq); 1610 if (skb) { 1611 msg_set_ack_required(buf_msg(skb)); 1612 tsk->expect_ack = true; 1613 } else { 1614 tsk->expect_ack = false; 1615 } 1616 tsk->msg_acc = 0; 1617 tsk->pkt_cnt = 0; 1618 } 1619 } else { 1620 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq); 1621 if (unlikely(rc != send)) 1622 break; 1623 blocks += tsk_inc(tsk, send + MIN_H_SIZE); 1624 } 1625 trace_tipc_sk_sendstream(sk, skb_peek(txq), 1626 TIPC_DUMP_SK_SNDQ, " "); 1627 rc = tipc_node_xmit(net, txq, dnode, tsk->portid); 1628 if (unlikely(rc == -ELINKCONG)) { 1629 tsk->cong_link_cnt = 1; 1630 rc = 0; 1631 } 1632 if (likely(!rc)) { 1633 tsk->snt_unacked += blocks; 1634 tsk->snd_backlog = 0; 1635 sent += send; 1636 } 1637 } while (sent < dlen && !rc); 1638 1639 return sent ? sent : rc; 1640 } 1641 1642 /** 1643 * tipc_send_packet - send a connection-oriented message 1644 * @sock: socket structure 1645 * @m: message to send 1646 * @dsz: length of data to be transmitted 1647 * 1648 * Used for SOCK_SEQPACKET messages. 1649 * 1650 * Return: the number of bytes sent on success, or errno otherwise 1651 */ 1652 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) 1653 { 1654 if (dsz > TIPC_MAX_USER_MSG_SIZE) 1655 return -EMSGSIZE; 1656 1657 return tipc_sendstream(sock, m, dsz); 1658 } 1659 1660 /* tipc_sk_finish_conn - complete the setup of a connection 1661 */ 1662 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 1663 u32 peer_node) 1664 { 1665 struct sock *sk = &tsk->sk; 1666 struct net *net = sock_net(sk); 1667 struct tipc_msg *msg = &tsk->phdr; 1668 1669 msg_set_syn(msg, 0); 1670 msg_set_destnode(msg, peer_node); 1671 msg_set_destport(msg, peer_port); 1672 msg_set_type(msg, TIPC_CONN_MSG); 1673 msg_set_lookup_scope(msg, 0); 1674 msg_set_hdr_sz(msg, SHORT_H_SIZE); 1675 1676 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 1677 tipc_set_sk_state(sk, TIPC_ESTABLISHED); 1678 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); 1679 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true); 1680 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); 1681 tsk_set_nagle(tsk); 1682 __skb_queue_purge(&sk->sk_write_queue); 1683 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) 1684 return; 1685 1686 /* Fall back to message based flow control */ 1687 tsk->rcv_win = FLOWCTL_MSG_WIN; 1688 tsk->snd_win = FLOWCTL_MSG_WIN; 1689 } 1690 1691 /** 1692 * tipc_sk_set_orig_addr - capture sender's address for received message 1693 * @m: descriptor for message info 1694 * @skb: received message 1695 * 1696 * Note: Address is not captured if not requested by receiver. 1697 */ 1698 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb) 1699 { 1700 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name); 1701 struct tipc_msg *hdr = buf_msg(skb); 1702 1703 if (!srcaddr) 1704 return; 1705 1706 srcaddr->sock.family = AF_TIPC; 1707 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR; 1708 srcaddr->sock.scope = 0; 1709 srcaddr->sock.addr.id.ref = msg_origport(hdr); 1710 srcaddr->sock.addr.id.node = msg_orignode(hdr); 1711 srcaddr->sock.addr.name.domain = 0; 1712 m->msg_namelen = sizeof(struct sockaddr_tipc); 1713 1714 if (!msg_in_group(hdr)) 1715 return; 1716 1717 /* Group message users may also want to know sending member's id */ 1718 srcaddr->member.family = AF_TIPC; 1719 srcaddr->member.addrtype = TIPC_SERVICE_ADDR; 1720 srcaddr->member.scope = 0; 1721 srcaddr->member.addr.name.name.type = msg_nametype(hdr); 1722 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member; 1723 srcaddr->member.addr.name.domain = 0; 1724 m->msg_namelen = sizeof(*srcaddr); 1725 } 1726 1727 /** 1728 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message 1729 * @m: descriptor for message info 1730 * @skb: received message buffer 1731 * @tsk: TIPC port associated with message 1732 * 1733 * Note: Ancillary data is not captured if not requested by receiver. 1734 * 1735 * Return: 0 if successful, otherwise errno 1736 */ 1737 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, 1738 struct tipc_sock *tsk) 1739 { 1740 struct tipc_msg *hdr; 1741 u32 data[3] = {0,}; 1742 bool has_addr; 1743 int dlen, rc; 1744 1745 if (likely(m->msg_controllen == 0)) 1746 return 0; 1747 1748 hdr = buf_msg(skb); 1749 dlen = msg_data_sz(hdr); 1750 1751 /* Capture errored message object, if any */ 1752 if (msg_errcode(hdr)) { 1753 if (skb_linearize(skb)) 1754 return -ENOMEM; 1755 hdr = buf_msg(skb); 1756 data[0] = msg_errcode(hdr); 1757 data[1] = dlen; 1758 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data); 1759 if (rc || !dlen) 1760 return rc; 1761 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr)); 1762 if (rc) 1763 return rc; 1764 } 1765 1766 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */ 1767 switch (msg_type(hdr)) { 1768 case TIPC_NAMED_MSG: 1769 has_addr = true; 1770 data[0] = msg_nametype(hdr); 1771 data[1] = msg_namelower(hdr); 1772 data[2] = data[1]; 1773 break; 1774 case TIPC_MCAST_MSG: 1775 has_addr = true; 1776 data[0] = msg_nametype(hdr); 1777 data[1] = msg_namelower(hdr); 1778 data[2] = msg_nameupper(hdr); 1779 break; 1780 case TIPC_CONN_MSG: 1781 has_addr = !!tsk->conn_addrtype; 1782 data[0] = msg_nametype(&tsk->phdr); 1783 data[1] = msg_nameinst(&tsk->phdr); 1784 data[2] = data[1]; 1785 break; 1786 default: 1787 has_addr = false; 1788 } 1789 if (!has_addr) 1790 return 0; 1791 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data); 1792 } 1793 1794 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk) 1795 { 1796 struct sock *sk = &tsk->sk; 1797 struct sk_buff *skb = NULL; 1798 struct tipc_msg *msg; 1799 u32 peer_port = tsk_peer_port(tsk); 1800 u32 dnode = tsk_peer_node(tsk); 1801 1802 if (!tipc_sk_connected(sk)) 1803 return NULL; 1804 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, 1805 dnode, tsk_own_node(tsk), peer_port, 1806 tsk->portid, TIPC_OK); 1807 if (!skb) 1808 return NULL; 1809 msg = buf_msg(skb); 1810 msg_set_conn_ack(msg, tsk->rcv_unacked); 1811 tsk->rcv_unacked = 0; 1812 1813 /* Adjust to and advertize the correct window limit */ 1814 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { 1815 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); 1816 msg_set_adv_win(msg, tsk->rcv_win); 1817 } 1818 return skb; 1819 } 1820 1821 static void tipc_sk_send_ack(struct tipc_sock *tsk) 1822 { 1823 struct sk_buff *skb; 1824 1825 skb = tipc_sk_build_ack(tsk); 1826 if (!skb) 1827 return; 1828 1829 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk), 1830 msg_link_selector(buf_msg(skb))); 1831 } 1832 1833 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) 1834 { 1835 struct sock *sk = sock->sk; 1836 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1837 long timeo = *timeop; 1838 int err = sock_error(sk); 1839 1840 if (err) 1841 return err; 1842 1843 for (;;) { 1844 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 1845 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1846 err = -ENOTCONN; 1847 break; 1848 } 1849 add_wait_queue(sk_sleep(sk), &wait); 1850 release_sock(sk); 1851 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1852 sched_annotate_sleep(); 1853 lock_sock(sk); 1854 remove_wait_queue(sk_sleep(sk), &wait); 1855 } 1856 err = 0; 1857 if (!skb_queue_empty(&sk->sk_receive_queue)) 1858 break; 1859 err = -EAGAIN; 1860 if (!timeo) 1861 break; 1862 err = sock_intr_errno(timeo); 1863 if (signal_pending(current)) 1864 break; 1865 1866 err = sock_error(sk); 1867 if (err) 1868 break; 1869 } 1870 *timeop = timeo; 1871 return err; 1872 } 1873 1874 /** 1875 * tipc_recvmsg - receive packet-oriented message 1876 * @sock: network socket 1877 * @m: descriptor for message info 1878 * @buflen: length of user buffer area 1879 * @flags: receive flags 1880 * 1881 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. 1882 * If the complete message doesn't fit in user area, truncate it. 1883 * 1884 * Return: size of returned message data, errno otherwise 1885 */ 1886 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 1887 size_t buflen, int flags) 1888 { 1889 struct sock *sk = sock->sk; 1890 bool connected = !tipc_sk_type_connectionless(sk); 1891 struct tipc_sock *tsk = tipc_sk(sk); 1892 int rc, err, hlen, dlen, copy; 1893 struct tipc_skb_cb *skb_cb; 1894 struct sk_buff_head xmitq; 1895 struct tipc_msg *hdr; 1896 struct sk_buff *skb; 1897 bool grp_evt; 1898 long timeout; 1899 1900 /* Catch invalid receive requests */ 1901 if (unlikely(!buflen)) 1902 return -EINVAL; 1903 1904 lock_sock(sk); 1905 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) { 1906 rc = -ENOTCONN; 1907 goto exit; 1908 } 1909 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1910 1911 /* Step rcv queue to first msg with data or error; wait if necessary */ 1912 do { 1913 rc = tipc_wait_for_rcvmsg(sock, &timeout); 1914 if (unlikely(rc)) 1915 goto exit; 1916 skb = skb_peek(&sk->sk_receive_queue); 1917 skb_cb = TIPC_SKB_CB(skb); 1918 hdr = buf_msg(skb); 1919 dlen = msg_data_sz(hdr); 1920 hlen = msg_hdr_sz(hdr); 1921 err = msg_errcode(hdr); 1922 grp_evt = msg_is_grp_evt(hdr); 1923 if (likely(dlen || err)) 1924 break; 1925 tsk_advance_rx_queue(sk); 1926 } while (1); 1927 1928 /* Collect msg meta data, including error code and rejected data */ 1929 tipc_sk_set_orig_addr(m, skb); 1930 rc = tipc_sk_anc_data_recv(m, skb, tsk); 1931 if (unlikely(rc)) 1932 goto exit; 1933 hdr = buf_msg(skb); 1934 1935 /* Capture data if non-error msg, otherwise just set return value */ 1936 if (likely(!err)) { 1937 int offset = skb_cb->bytes_read; 1938 1939 copy = min_t(int, dlen - offset, buflen); 1940 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 1941 if (unlikely(rc)) 1942 goto exit; 1943 if (unlikely(offset + copy < dlen)) { 1944 if (flags & MSG_EOR) { 1945 if (!(flags & MSG_PEEK)) 1946 skb_cb->bytes_read = offset + copy; 1947 } else { 1948 m->msg_flags |= MSG_TRUNC; 1949 skb_cb->bytes_read = 0; 1950 } 1951 } else { 1952 if (flags & MSG_EOR) 1953 m->msg_flags |= MSG_EOR; 1954 skb_cb->bytes_read = 0; 1955 } 1956 } else { 1957 copy = 0; 1958 rc = 0; 1959 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) { 1960 rc = -ECONNRESET; 1961 goto exit; 1962 } 1963 } 1964 1965 /* Mark message as group event if applicable */ 1966 if (unlikely(grp_evt)) { 1967 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN) 1968 m->msg_flags |= MSG_EOR; 1969 m->msg_flags |= MSG_OOB; 1970 copy = 0; 1971 } 1972 1973 /* Caption of data or error code/rejected data was successful */ 1974 if (unlikely(flags & MSG_PEEK)) 1975 goto exit; 1976 1977 /* Send group flow control advertisement when applicable */ 1978 if (tsk->group && msg_in_group(hdr) && !grp_evt) { 1979 __skb_queue_head_init(&xmitq); 1980 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen), 1981 msg_orignode(hdr), msg_origport(hdr), 1982 &xmitq); 1983 tipc_node_distr_xmit(sock_net(sk), &xmitq); 1984 } 1985 1986 if (skb_cb->bytes_read) 1987 goto exit; 1988 1989 tsk_advance_rx_queue(sk); 1990 1991 if (likely(!connected)) 1992 goto exit; 1993 1994 /* Send connection flow control advertisement when applicable */ 1995 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 1996 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 1997 tipc_sk_send_ack(tsk); 1998 exit: 1999 release_sock(sk); 2000 return rc ? rc : copy; 2001 } 2002 2003 /** 2004 * tipc_recvstream - receive stream-oriented data 2005 * @sock: network socket 2006 * @m: descriptor for message info 2007 * @buflen: total size of user buffer area 2008 * @flags: receive flags 2009 * 2010 * Used for SOCK_STREAM messages only. If not enough data is available 2011 * will optionally wait for more; never truncates data. 2012 * 2013 * Return: size of returned message data, errno otherwise 2014 */ 2015 static int tipc_recvstream(struct socket *sock, struct msghdr *m, 2016 size_t buflen, int flags) 2017 { 2018 struct sock *sk = sock->sk; 2019 struct tipc_sock *tsk = tipc_sk(sk); 2020 struct sk_buff *skb; 2021 struct tipc_msg *hdr; 2022 struct tipc_skb_cb *skb_cb; 2023 bool peek = flags & MSG_PEEK; 2024 int offset, required, copy, copied = 0; 2025 int hlen, dlen, err, rc; 2026 long timeout; 2027 2028 /* Catch invalid receive attempts */ 2029 if (unlikely(!buflen)) 2030 return -EINVAL; 2031 2032 lock_sock(sk); 2033 2034 if (unlikely(sk->sk_state == TIPC_OPEN)) { 2035 rc = -ENOTCONN; 2036 goto exit; 2037 } 2038 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen); 2039 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 2040 2041 do { 2042 /* Look at first msg in receive queue; wait if necessary */ 2043 rc = tipc_wait_for_rcvmsg(sock, &timeout); 2044 if (unlikely(rc)) 2045 break; 2046 skb = skb_peek(&sk->sk_receive_queue); 2047 skb_cb = TIPC_SKB_CB(skb); 2048 hdr = buf_msg(skb); 2049 dlen = msg_data_sz(hdr); 2050 hlen = msg_hdr_sz(hdr); 2051 err = msg_errcode(hdr); 2052 2053 /* Discard any empty non-errored (SYN-) message */ 2054 if (unlikely(!dlen && !err)) { 2055 tsk_advance_rx_queue(sk); 2056 continue; 2057 } 2058 2059 /* Collect msg meta data, incl. error code and rejected data */ 2060 if (!copied) { 2061 tipc_sk_set_orig_addr(m, skb); 2062 rc = tipc_sk_anc_data_recv(m, skb, tsk); 2063 if (rc) 2064 break; 2065 hdr = buf_msg(skb); 2066 } 2067 2068 /* Copy data if msg ok, otherwise return error/partial data */ 2069 if (likely(!err)) { 2070 offset = skb_cb->bytes_read; 2071 copy = min_t(int, dlen - offset, buflen - copied); 2072 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy); 2073 if (unlikely(rc)) 2074 break; 2075 copied += copy; 2076 offset += copy; 2077 if (unlikely(offset < dlen)) { 2078 if (!peek) 2079 skb_cb->bytes_read = offset; 2080 break; 2081 } 2082 } else { 2083 rc = 0; 2084 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control) 2085 rc = -ECONNRESET; 2086 if (copied || rc) 2087 break; 2088 } 2089 2090 if (unlikely(peek)) 2091 break; 2092 2093 tsk_advance_rx_queue(sk); 2094 2095 /* Send connection flow control advertisement when applicable */ 2096 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen); 2097 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE) 2098 tipc_sk_send_ack(tsk); 2099 2100 /* Exit if all requested data or FIN/error received */ 2101 if (copied == buflen || err) 2102 break; 2103 2104 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required); 2105 exit: 2106 release_sock(sk); 2107 return copied ? copied : rc; 2108 } 2109 2110 /** 2111 * tipc_write_space - wake up thread if port congestion is released 2112 * @sk: socket 2113 */ 2114 static void tipc_write_space(struct sock *sk) 2115 { 2116 struct socket_wq *wq; 2117 2118 rcu_read_lock(); 2119 wq = rcu_dereference(sk->sk_wq); 2120 if (skwq_has_sleeper(wq)) 2121 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2122 EPOLLWRNORM | EPOLLWRBAND); 2123 rcu_read_unlock(); 2124 } 2125 2126 /** 2127 * tipc_data_ready - wake up threads to indicate messages have been received 2128 * @sk: socket 2129 */ 2130 static void tipc_data_ready(struct sock *sk) 2131 { 2132 struct socket_wq *wq; 2133 2134 trace_sk_data_ready(sk); 2135 2136 rcu_read_lock(); 2137 wq = rcu_dereference(sk->sk_wq); 2138 if (skwq_has_sleeper(wq)) 2139 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | 2140 EPOLLRDNORM | EPOLLRDBAND); 2141 rcu_read_unlock(); 2142 } 2143 2144 static void tipc_sock_destruct(struct sock *sk) 2145 { 2146 __skb_queue_purge(&sk->sk_receive_queue); 2147 } 2148 2149 static void tipc_sk_proto_rcv(struct sock *sk, 2150 struct sk_buff_head *inputq, 2151 struct sk_buff_head *xmitq) 2152 { 2153 struct sk_buff *skb = __skb_dequeue(inputq); 2154 struct tipc_sock *tsk = tipc_sk(sk); 2155 struct tipc_msg *hdr = buf_msg(skb); 2156 struct tipc_group *grp = tsk->group; 2157 bool wakeup = false; 2158 2159 switch (msg_user(hdr)) { 2160 case CONN_MANAGER: 2161 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq); 2162 return; 2163 case SOCK_WAKEUP: 2164 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0); 2165 /* coupled with smp_rmb() in tipc_wait_for_cond() */ 2166 smp_wmb(); 2167 tsk->cong_link_cnt--; 2168 wakeup = true; 2169 tipc_sk_push_backlog(tsk, false); 2170 break; 2171 case GROUP_PROTOCOL: 2172 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq); 2173 break; 2174 case TOP_SRV: 2175 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf, 2176 hdr, inputq, xmitq); 2177 break; 2178 default: 2179 break; 2180 } 2181 2182 if (wakeup) 2183 sk->sk_write_space(sk); 2184 2185 kfree_skb(skb); 2186 } 2187 2188 /** 2189 * tipc_sk_filter_connect - check incoming message for a connection-based socket 2190 * @tsk: TIPC socket 2191 * @skb: pointer to message buffer. 2192 * @xmitq: for Nagle ACK if any 2193 * Return: true if message should be added to receive queue, false otherwise 2194 */ 2195 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb, 2196 struct sk_buff_head *xmitq) 2197 { 2198 struct sock *sk = &tsk->sk; 2199 struct net *net = sock_net(sk); 2200 struct tipc_msg *hdr = buf_msg(skb); 2201 bool con_msg = msg_connected(hdr); 2202 u32 pport = tsk_peer_port(tsk); 2203 u32 pnode = tsk_peer_node(tsk); 2204 u32 oport = msg_origport(hdr); 2205 u32 onode = msg_orignode(hdr); 2206 int err = msg_errcode(hdr); 2207 unsigned long delay; 2208 2209 if (unlikely(msg_mcast(hdr))) 2210 return false; 2211 tsk->oneway = 0; 2212 2213 switch (sk->sk_state) { 2214 case TIPC_CONNECTING: 2215 /* Setup ACK */ 2216 if (likely(con_msg)) { 2217 if (err) 2218 break; 2219 tipc_sk_finish_conn(tsk, oport, onode); 2220 msg_set_importance(&tsk->phdr, msg_importance(hdr)); 2221 /* ACK+ message with data is added to receive queue */ 2222 if (msg_data_sz(hdr)) 2223 return true; 2224 /* Empty ACK-, - wake up sleeping connect() and drop */ 2225 sk->sk_state_change(sk); 2226 msg_set_dest_droppable(hdr, 1); 2227 return false; 2228 } 2229 /* Ignore connectionless message if not from listening socket */ 2230 if (oport != pport || onode != pnode) 2231 return false; 2232 2233 /* Rejected SYN */ 2234 if (err != TIPC_ERR_OVERLOAD) 2235 break; 2236 2237 /* Prepare for new setup attempt if we have a SYN clone */ 2238 if (skb_queue_empty(&sk->sk_write_queue)) 2239 break; 2240 get_random_bytes(&delay, 2); 2241 delay %= (tsk->conn_timeout / 4); 2242 delay = msecs_to_jiffies(delay + 100); 2243 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay); 2244 return false; 2245 case TIPC_OPEN: 2246 case TIPC_DISCONNECTING: 2247 return false; 2248 case TIPC_LISTEN: 2249 /* Accept only SYN message */ 2250 if (!msg_is_syn(hdr) && 2251 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) 2252 return false; 2253 if (!con_msg && !err) 2254 return true; 2255 return false; 2256 case TIPC_ESTABLISHED: 2257 if (!skb_queue_empty(&sk->sk_write_queue)) 2258 tipc_sk_push_backlog(tsk, false); 2259 /* Accept only connection-based messages sent by peer */ 2260 if (likely(con_msg && !err && pport == oport && 2261 pnode == onode)) { 2262 if (msg_ack_required(hdr)) { 2263 struct sk_buff *skb; 2264 2265 skb = tipc_sk_build_ack(tsk); 2266 if (skb) { 2267 msg_set_nagle_ack(buf_msg(skb)); 2268 __skb_queue_tail(xmitq, skb); 2269 } 2270 } 2271 return true; 2272 } 2273 if (!tsk_peer_msg(tsk, hdr)) 2274 return false; 2275 if (!err) 2276 return true; 2277 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2278 tipc_node_remove_conn(net, pnode, tsk->portid); 2279 sk->sk_state_change(sk); 2280 return true; 2281 default: 2282 pr_err("Unknown sk_state %u\n", sk->sk_state); 2283 } 2284 /* Abort connection setup attempt */ 2285 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2286 sk->sk_err = ECONNREFUSED; 2287 sk->sk_state_change(sk); 2288 return true; 2289 } 2290 2291 /** 2292 * rcvbuf_limit - get proper overload limit of socket receive queue 2293 * @sk: socket 2294 * @skb: message 2295 * 2296 * For connection oriented messages, irrespective of importance, 2297 * default queue limit is 2 MB. 2298 * 2299 * For connectionless messages, queue limits are based on message 2300 * importance as follows: 2301 * 2302 * TIPC_LOW_IMPORTANCE (2 MB) 2303 * TIPC_MEDIUM_IMPORTANCE (4 MB) 2304 * TIPC_HIGH_IMPORTANCE (8 MB) 2305 * TIPC_CRITICAL_IMPORTANCE (16 MB) 2306 * 2307 * Return: overload limit according to corresponding message importance 2308 */ 2309 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) 2310 { 2311 struct tipc_sock *tsk = tipc_sk(sk); 2312 struct tipc_msg *hdr = buf_msg(skb); 2313 2314 if (unlikely(msg_in_group(hdr))) 2315 return READ_ONCE(sk->sk_rcvbuf); 2316 2317 if (unlikely(!msg_connected(hdr))) 2318 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr); 2319 2320 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) 2321 return READ_ONCE(sk->sk_rcvbuf); 2322 2323 return FLOWCTL_MSG_LIM; 2324 } 2325 2326 /** 2327 * tipc_sk_filter_rcv - validate incoming message 2328 * @sk: socket 2329 * @skb: pointer to message. 2330 * @xmitq: output message area (FIXME) 2331 * 2332 * Enqueues message on receive queue if acceptable; optionally handles 2333 * disconnect indication for a connected socket. 2334 * 2335 * Called with socket lock already taken 2336 */ 2337 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb, 2338 struct sk_buff_head *xmitq) 2339 { 2340 bool sk_conn = !tipc_sk_type_connectionless(sk); 2341 struct tipc_sock *tsk = tipc_sk(sk); 2342 struct tipc_group *grp = tsk->group; 2343 struct tipc_msg *hdr = buf_msg(skb); 2344 struct net *net = sock_net(sk); 2345 struct sk_buff_head inputq; 2346 int mtyp = msg_type(hdr); 2347 int limit, err = TIPC_OK; 2348 2349 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " "); 2350 TIPC_SKB_CB(skb)->bytes_read = 0; 2351 __skb_queue_head_init(&inputq); 2352 __skb_queue_tail(&inputq, skb); 2353 2354 if (unlikely(!msg_isdata(hdr))) 2355 tipc_sk_proto_rcv(sk, &inputq, xmitq); 2356 2357 if (unlikely(grp)) 2358 tipc_group_filter_msg(grp, &inputq, xmitq); 2359 2360 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG) 2361 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq); 2362 2363 /* Validate and add to receive buffer if there is space */ 2364 while ((skb = __skb_dequeue(&inputq))) { 2365 hdr = buf_msg(skb); 2366 limit = rcvbuf_limit(sk, skb); 2367 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) || 2368 (!sk_conn && msg_connected(hdr)) || 2369 (!grp && msg_in_group(hdr))) 2370 err = TIPC_ERR_NO_PORT; 2371 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) { 2372 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, 2373 "err_overload2!"); 2374 atomic_inc(&sk->sk_drops); 2375 err = TIPC_ERR_OVERLOAD; 2376 } 2377 2378 if (unlikely(err)) { 2379 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) { 2380 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, 2381 "@filter_rcv!"); 2382 __skb_queue_tail(xmitq, skb); 2383 } 2384 err = TIPC_OK; 2385 continue; 2386 } 2387 __skb_queue_tail(&sk->sk_receive_queue, skb); 2388 skb_set_owner_r(skb, sk); 2389 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL, 2390 "rcvq >90% allocated!"); 2391 sk->sk_data_ready(sk); 2392 } 2393 } 2394 2395 /** 2396 * tipc_sk_backlog_rcv - handle incoming message from backlog queue 2397 * @sk: socket 2398 * @skb: message 2399 * 2400 * Caller must hold socket lock 2401 */ 2402 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 2403 { 2404 unsigned int before = sk_rmem_alloc_get(sk); 2405 struct sk_buff_head xmitq; 2406 unsigned int added; 2407 2408 __skb_queue_head_init(&xmitq); 2409 2410 tipc_sk_filter_rcv(sk, skb, &xmitq); 2411 added = sk_rmem_alloc_get(sk) - before; 2412 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt); 2413 2414 /* Send pending response/rejected messages, if any */ 2415 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2416 return 0; 2417 } 2418 2419 /** 2420 * tipc_sk_enqueue - extract all buffers with destination 'dport' from 2421 * inputq and try adding them to socket or backlog queue 2422 * @inputq: list of incoming buffers with potentially different destinations 2423 * @sk: socket where the buffers should be enqueued 2424 * @dport: port number for the socket 2425 * @xmitq: output queue 2426 * 2427 * Caller must hold socket lock 2428 */ 2429 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, 2430 u32 dport, struct sk_buff_head *xmitq) 2431 { 2432 unsigned long time_limit = jiffies + usecs_to_jiffies(20000); 2433 struct sk_buff *skb; 2434 unsigned int lim; 2435 atomic_t *dcnt; 2436 u32 onode; 2437 2438 while (skb_queue_len(inputq)) { 2439 if (unlikely(time_after_eq(jiffies, time_limit))) 2440 return; 2441 2442 skb = tipc_skb_dequeue(inputq, dport); 2443 if (unlikely(!skb)) 2444 return; 2445 2446 /* Add message directly to receive queue if possible */ 2447 if (!sock_owned_by_user(sk)) { 2448 tipc_sk_filter_rcv(sk, skb, xmitq); 2449 continue; 2450 } 2451 2452 /* Try backlog, compensating for double-counted bytes */ 2453 dcnt = &tipc_sk(sk)->dupl_rcvcnt; 2454 if (!sk->sk_backlog.len) 2455 atomic_set(dcnt, 0); 2456 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 2457 if (likely(!sk_add_backlog(sk, skb, lim))) { 2458 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL, 2459 "bklg & rcvq >90% allocated!"); 2460 continue; 2461 } 2462 2463 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!"); 2464 /* Overload => reject message back to sender */ 2465 onode = tipc_own_addr(sock_net(sk)); 2466 atomic_inc(&sk->sk_drops); 2467 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) { 2468 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL, 2469 "@sk_enqueue!"); 2470 __skb_queue_tail(xmitq, skb); 2471 } 2472 break; 2473 } 2474 } 2475 2476 /** 2477 * tipc_sk_rcv - handle a chain of incoming buffers 2478 * @net: the associated network namespace 2479 * @inputq: buffer list containing the buffers 2480 * Consumes all buffers in list until inputq is empty 2481 * Note: may be called in multiple threads referring to the same queue 2482 */ 2483 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) 2484 { 2485 struct sk_buff_head xmitq; 2486 u32 dnode, dport = 0; 2487 int err; 2488 struct tipc_sock *tsk; 2489 struct sock *sk; 2490 struct sk_buff *skb; 2491 2492 __skb_queue_head_init(&xmitq); 2493 while (skb_queue_len(inputq)) { 2494 dport = tipc_skb_peek_port(inputq, dport); 2495 tsk = tipc_sk_lookup(net, dport); 2496 2497 if (likely(tsk)) { 2498 sk = &tsk->sk; 2499 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { 2500 tipc_sk_enqueue(inputq, sk, dport, &xmitq); 2501 spin_unlock_bh(&sk->sk_lock.slock); 2502 } 2503 /* Send pending response/rejected messages, if any */ 2504 tipc_node_distr_xmit(sock_net(sk), &xmitq); 2505 sock_put(sk); 2506 continue; 2507 } 2508 /* No destination socket => dequeue skb if still there */ 2509 skb = tipc_skb_dequeue(inputq, dport); 2510 if (!skb) 2511 return; 2512 2513 /* Try secondary lookup if unresolved named message */ 2514 err = TIPC_ERR_NO_PORT; 2515 if (tipc_msg_lookup_dest(net, skb, &err)) 2516 goto xmit; 2517 2518 /* Prepare for message rejection */ 2519 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) 2520 continue; 2521 2522 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!"); 2523 xmit: 2524 dnode = msg_destnode(buf_msg(skb)); 2525 tipc_node_xmit_skb(net, skb, dnode, dport); 2526 } 2527 } 2528 2529 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) 2530 { 2531 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2532 struct sock *sk = sock->sk; 2533 int done; 2534 2535 do { 2536 int err = sock_error(sk); 2537 if (err) 2538 return err; 2539 if (!*timeo_p) 2540 return -ETIMEDOUT; 2541 if (signal_pending(current)) 2542 return sock_intr_errno(*timeo_p); 2543 if (sk->sk_state == TIPC_DISCONNECTING) 2544 break; 2545 2546 add_wait_queue(sk_sleep(sk), &wait); 2547 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk), 2548 &wait); 2549 remove_wait_queue(sk_sleep(sk), &wait); 2550 } while (!done); 2551 return 0; 2552 } 2553 2554 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr) 2555 { 2556 if (addr->family != AF_TIPC) 2557 return false; 2558 if (addr->addrtype == TIPC_SERVICE_RANGE) 2559 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper); 2560 return (addr->addrtype == TIPC_SERVICE_ADDR || 2561 addr->addrtype == TIPC_SOCKET_ADDR); 2562 } 2563 2564 /** 2565 * tipc_connect - establish a connection to another TIPC port 2566 * @sock: socket structure 2567 * @dest: socket address for destination port 2568 * @destlen: size of socket address data structure 2569 * @flags: file-related flags associated with socket 2570 * 2571 * Return: 0 on success, errno otherwise 2572 */ 2573 static int tipc_connect(struct socket *sock, struct sockaddr *dest, 2574 int destlen, int flags) 2575 { 2576 struct sock *sk = sock->sk; 2577 struct tipc_sock *tsk = tipc_sk(sk); 2578 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; 2579 struct msghdr m = {NULL,}; 2580 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; 2581 int previous; 2582 int res = 0; 2583 2584 if (destlen != sizeof(struct sockaddr_tipc)) 2585 return -EINVAL; 2586 2587 lock_sock(sk); 2588 2589 if (tsk->group) { 2590 res = -EINVAL; 2591 goto exit; 2592 } 2593 2594 if (dst->family == AF_UNSPEC) { 2595 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc)); 2596 if (!tipc_sk_type_connectionless(sk)) 2597 res = -EINVAL; 2598 goto exit; 2599 } 2600 if (!tipc_sockaddr_is_sane(dst)) { 2601 res = -EINVAL; 2602 goto exit; 2603 } 2604 /* DGRAM/RDM connect(), just save the destaddr */ 2605 if (tipc_sk_type_connectionless(sk)) { 2606 memcpy(&tsk->peer, dest, destlen); 2607 goto exit; 2608 } else if (dst->addrtype == TIPC_SERVICE_RANGE) { 2609 res = -EINVAL; 2610 goto exit; 2611 } 2612 2613 previous = sk->sk_state; 2614 2615 switch (sk->sk_state) { 2616 case TIPC_OPEN: 2617 /* Send a 'SYN-' to destination */ 2618 m.msg_name = dest; 2619 m.msg_namelen = destlen; 2620 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0); 2621 2622 /* If connect is in non-blocking case, set MSG_DONTWAIT to 2623 * indicate send_msg() is never blocked. 2624 */ 2625 if (!timeout) 2626 m.msg_flags = MSG_DONTWAIT; 2627 2628 res = __tipc_sendmsg(sock, &m, 0); 2629 if ((res < 0) && (res != -EWOULDBLOCK)) 2630 goto exit; 2631 2632 /* Just entered TIPC_CONNECTING state; the only 2633 * difference is that return value in non-blocking 2634 * case is EINPROGRESS, rather than EALREADY. 2635 */ 2636 res = -EINPROGRESS; 2637 fallthrough; 2638 case TIPC_CONNECTING: 2639 if (!timeout) { 2640 if (previous == TIPC_CONNECTING) 2641 res = -EALREADY; 2642 goto exit; 2643 } 2644 timeout = msecs_to_jiffies(timeout); 2645 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ 2646 res = tipc_wait_for_connect(sock, &timeout); 2647 break; 2648 case TIPC_ESTABLISHED: 2649 res = -EISCONN; 2650 break; 2651 default: 2652 res = -EINVAL; 2653 } 2654 2655 exit: 2656 release_sock(sk); 2657 return res; 2658 } 2659 2660 /** 2661 * tipc_listen - allow socket to listen for incoming connections 2662 * @sock: socket structure 2663 * @len: (unused) 2664 * 2665 * Return: 0 on success, errno otherwise 2666 */ 2667 static int tipc_listen(struct socket *sock, int len) 2668 { 2669 struct sock *sk = sock->sk; 2670 int res; 2671 2672 lock_sock(sk); 2673 res = tipc_set_sk_state(sk, TIPC_LISTEN); 2674 release_sock(sk); 2675 2676 return res; 2677 } 2678 2679 static int tipc_wait_for_accept(struct socket *sock, long timeo) 2680 { 2681 struct sock *sk = sock->sk; 2682 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2683 int err; 2684 2685 /* True wake-one mechanism for incoming connections: only 2686 * one process gets woken up, not the 'whole herd'. 2687 * Since we do not 'race & poll' for established sockets 2688 * anymore, the common case will execute the loop only once. 2689 */ 2690 for (;;) { 2691 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { 2692 add_wait_queue(sk_sleep(sk), &wait); 2693 release_sock(sk); 2694 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 2695 lock_sock(sk); 2696 remove_wait_queue(sk_sleep(sk), &wait); 2697 } 2698 err = 0; 2699 if (!skb_queue_empty(&sk->sk_receive_queue)) 2700 break; 2701 err = -EAGAIN; 2702 if (!timeo) 2703 break; 2704 err = sock_intr_errno(timeo); 2705 if (signal_pending(current)) 2706 break; 2707 } 2708 return err; 2709 } 2710 2711 /** 2712 * tipc_accept - wait for connection request 2713 * @sock: listening socket 2714 * @new_sock: new socket that is to be connected 2715 * @flags: file-related flags associated with socket 2716 * @kern: caused by kernel or by userspace? 2717 * 2718 * Return: 0 on success, errno otherwise 2719 */ 2720 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags, 2721 bool kern) 2722 { 2723 struct sock *new_sk, *sk = sock->sk; 2724 struct tipc_sock *new_tsock; 2725 struct msghdr m = {NULL,}; 2726 struct tipc_msg *msg; 2727 struct sk_buff *buf; 2728 long timeo; 2729 int res; 2730 2731 lock_sock(sk); 2732 2733 if (sk->sk_state != TIPC_LISTEN) { 2734 res = -EINVAL; 2735 goto exit; 2736 } 2737 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 2738 res = tipc_wait_for_accept(sock, timeo); 2739 if (res) 2740 goto exit; 2741 2742 buf = skb_peek(&sk->sk_receive_queue); 2743 2744 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern); 2745 if (res) 2746 goto exit; 2747 security_sk_clone(sock->sk, new_sock->sk); 2748 2749 new_sk = new_sock->sk; 2750 new_tsock = tipc_sk(new_sk); 2751 msg = buf_msg(buf); 2752 2753 /* we lock on new_sk; but lockdep sees the lock on sk */ 2754 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); 2755 2756 /* 2757 * Reject any stray messages received by new socket 2758 * before the socket lock was taken (very, very unlikely) 2759 */ 2760 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT); 2761 2762 /* Connect new socket to it's peer */ 2763 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); 2764 2765 tsk_set_importance(new_sk, msg_importance(msg)); 2766 if (msg_named(msg)) { 2767 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR; 2768 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg)); 2769 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg)); 2770 } 2771 2772 /* 2773 * Respond to 'SYN-' by discarding it & returning 'ACK'. 2774 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'. 2775 */ 2776 if (!msg_data_sz(msg)) { 2777 tsk_advance_rx_queue(sk); 2778 } else { 2779 __skb_dequeue(&sk->sk_receive_queue); 2780 __skb_queue_head(&new_sk->sk_receive_queue, buf); 2781 skb_set_owner_r(buf, new_sk); 2782 } 2783 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0); 2784 __tipc_sendstream(new_sock, &m, 0); 2785 release_sock(new_sk); 2786 exit: 2787 release_sock(sk); 2788 return res; 2789 } 2790 2791 /** 2792 * tipc_shutdown - shutdown socket connection 2793 * @sock: socket structure 2794 * @how: direction to close (must be SHUT_RDWR) 2795 * 2796 * Terminates connection (if necessary), then purges socket's receive queue. 2797 * 2798 * Return: 0 on success, errno otherwise 2799 */ 2800 static int tipc_shutdown(struct socket *sock, int how) 2801 { 2802 struct sock *sk = sock->sk; 2803 int res; 2804 2805 if (how != SHUT_RDWR) 2806 return -EINVAL; 2807 2808 lock_sock(sk); 2809 2810 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " "); 2811 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN); 2812 sk->sk_shutdown = SHUTDOWN_MASK; 2813 2814 if (sk->sk_state == TIPC_DISCONNECTING) { 2815 /* Discard any unreceived messages */ 2816 __skb_queue_purge(&sk->sk_receive_queue); 2817 2818 res = 0; 2819 } else { 2820 res = -ENOTCONN; 2821 } 2822 /* Wake up anyone sleeping in poll. */ 2823 sk->sk_state_change(sk); 2824 2825 release_sock(sk); 2826 return res; 2827 } 2828 2829 static void tipc_sk_check_probing_state(struct sock *sk, 2830 struct sk_buff_head *list) 2831 { 2832 struct tipc_sock *tsk = tipc_sk(sk); 2833 u32 pnode = tsk_peer_node(tsk); 2834 u32 pport = tsk_peer_port(tsk); 2835 u32 self = tsk_own_node(tsk); 2836 u32 oport = tsk->portid; 2837 struct sk_buff *skb; 2838 2839 if (tsk->probe_unacked) { 2840 tipc_set_sk_state(sk, TIPC_DISCONNECTING); 2841 sk->sk_err = ECONNABORTED; 2842 tipc_node_remove_conn(sock_net(sk), pnode, pport); 2843 sk->sk_state_change(sk); 2844 return; 2845 } 2846 /* Prepare new probe */ 2847 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0, 2848 pnode, self, pport, oport, TIPC_OK); 2849 if (skb) 2850 __skb_queue_tail(list, skb); 2851 tsk->probe_unacked = true; 2852 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV); 2853 } 2854 2855 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list) 2856 { 2857 struct tipc_sock *tsk = tipc_sk(sk); 2858 2859 /* Try again later if dest link is congested */ 2860 if (tsk->cong_link_cnt) { 2861 sk_reset_timer(sk, &sk->sk_timer, 2862 jiffies + msecs_to_jiffies(100)); 2863 return; 2864 } 2865 /* Prepare SYN for retransmit */ 2866 tipc_msg_skb_clone(&sk->sk_write_queue, list); 2867 } 2868 2869 static void tipc_sk_timeout(struct timer_list *t) 2870 { 2871 struct sock *sk = from_timer(sk, t, sk_timer); 2872 struct tipc_sock *tsk = tipc_sk(sk); 2873 u32 pnode = tsk_peer_node(tsk); 2874 struct sk_buff_head list; 2875 int rc = 0; 2876 2877 __skb_queue_head_init(&list); 2878 bh_lock_sock(sk); 2879 2880 /* Try again later if socket is busy */ 2881 if (sock_owned_by_user(sk)) { 2882 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20); 2883 bh_unlock_sock(sk); 2884 sock_put(sk); 2885 return; 2886 } 2887 2888 if (sk->sk_state == TIPC_ESTABLISHED) 2889 tipc_sk_check_probing_state(sk, &list); 2890 else if (sk->sk_state == TIPC_CONNECTING) 2891 tipc_sk_retry_connect(sk, &list); 2892 2893 bh_unlock_sock(sk); 2894 2895 if (!skb_queue_empty(&list)) 2896 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid); 2897 2898 /* SYN messages may cause link congestion */ 2899 if (rc == -ELINKCONG) { 2900 tipc_dest_push(&tsk->cong_links, pnode, 0); 2901 tsk->cong_link_cnt = 1; 2902 } 2903 sock_put(sk); 2904 } 2905 2906 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2907 { 2908 struct sock *sk = &tsk->sk; 2909 struct net *net = sock_net(sk); 2910 struct tipc_socket_addr skaddr; 2911 struct publication *p; 2912 u32 key; 2913 2914 if (tipc_sk_connected(sk)) 2915 return -EINVAL; 2916 key = tsk->portid + tsk->pub_count + 1; 2917 if (key == tsk->portid) 2918 return -EADDRINUSE; 2919 skaddr.ref = tsk->portid; 2920 skaddr.node = tipc_own_addr(net); 2921 p = tipc_nametbl_publish(net, ua, &skaddr, key); 2922 if (unlikely(!p)) 2923 return -EINVAL; 2924 2925 list_add(&p->binding_sock, &tsk->publications); 2926 tsk->pub_count++; 2927 tsk->published = true; 2928 return 0; 2929 } 2930 2931 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua) 2932 { 2933 struct net *net = sock_net(&tsk->sk); 2934 struct publication *safe, *p; 2935 struct tipc_uaddr _ua; 2936 int rc = -EINVAL; 2937 2938 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) { 2939 if (!ua) { 2940 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope, 2941 p->sr.type, p->sr.lower, p->sr.upper); 2942 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key); 2943 continue; 2944 } 2945 /* Unbind specific publication */ 2946 if (p->scope != ua->scope) 2947 continue; 2948 if (p->sr.type != ua->sr.type) 2949 continue; 2950 if (p->sr.lower != ua->sr.lower) 2951 continue; 2952 if (p->sr.upper != ua->sr.upper) 2953 break; 2954 tipc_nametbl_withdraw(net, ua, &p->sk, p->key); 2955 rc = 0; 2956 break; 2957 } 2958 if (list_empty(&tsk->publications)) { 2959 tsk->published = 0; 2960 rc = 0; 2961 } 2962 return rc; 2963 } 2964 2965 /* tipc_sk_reinit: set non-zero address in all existing sockets 2966 * when we go from standalone to network mode. 2967 */ 2968 void tipc_sk_reinit(struct net *net) 2969 { 2970 struct tipc_net *tn = net_generic(net, tipc_net_id); 2971 struct rhashtable_iter iter; 2972 struct tipc_sock *tsk; 2973 struct tipc_msg *msg; 2974 2975 rhashtable_walk_enter(&tn->sk_rht, &iter); 2976 2977 do { 2978 rhashtable_walk_start(&iter); 2979 2980 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) { 2981 sock_hold(&tsk->sk); 2982 rhashtable_walk_stop(&iter); 2983 lock_sock(&tsk->sk); 2984 msg = &tsk->phdr; 2985 msg_set_prevnode(msg, tipc_own_addr(net)); 2986 msg_set_orignode(msg, tipc_own_addr(net)); 2987 release_sock(&tsk->sk); 2988 rhashtable_walk_start(&iter); 2989 sock_put(&tsk->sk); 2990 } 2991 2992 rhashtable_walk_stop(&iter); 2993 } while (tsk == ERR_PTR(-EAGAIN)); 2994 2995 rhashtable_walk_exit(&iter); 2996 } 2997 2998 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) 2999 { 3000 struct tipc_net *tn = net_generic(net, tipc_net_id); 3001 struct tipc_sock *tsk; 3002 3003 rcu_read_lock(); 3004 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params); 3005 if (tsk) 3006 sock_hold(&tsk->sk); 3007 rcu_read_unlock(); 3008 3009 return tsk; 3010 } 3011 3012 static int tipc_sk_insert(struct tipc_sock *tsk) 3013 { 3014 struct sock *sk = &tsk->sk; 3015 struct net *net = sock_net(sk); 3016 struct tipc_net *tn = net_generic(net, tipc_net_id); 3017 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; 3018 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT; 3019 3020 while (remaining--) { 3021 portid++; 3022 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) 3023 portid = TIPC_MIN_PORT; 3024 tsk->portid = portid; 3025 sock_hold(&tsk->sk); 3026 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, 3027 tsk_rht_params)) 3028 return 0; 3029 sock_put(&tsk->sk); 3030 } 3031 3032 return -1; 3033 } 3034 3035 static void tipc_sk_remove(struct tipc_sock *tsk) 3036 { 3037 struct sock *sk = &tsk->sk; 3038 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); 3039 3040 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { 3041 WARN_ON(refcount_read(&sk->sk_refcnt) == 1); 3042 __sock_put(sk); 3043 } 3044 } 3045 3046 static const struct rhashtable_params tsk_rht_params = { 3047 .nelem_hint = 192, 3048 .head_offset = offsetof(struct tipc_sock, node), 3049 .key_offset = offsetof(struct tipc_sock, portid), 3050 .key_len = sizeof(u32), /* portid */ 3051 .max_size = 1048576, 3052 .min_size = 256, 3053 .automatic_shrinking = true, 3054 }; 3055 3056 int tipc_sk_rht_init(struct net *net) 3057 { 3058 struct tipc_net *tn = net_generic(net, tipc_net_id); 3059 3060 return rhashtable_init(&tn->sk_rht, &tsk_rht_params); 3061 } 3062 3063 void tipc_sk_rht_destroy(struct net *net) 3064 { 3065 struct tipc_net *tn = net_generic(net, tipc_net_id); 3066 3067 /* Wait for socket readers to complete */ 3068 synchronize_net(); 3069 3070 rhashtable_destroy(&tn->sk_rht); 3071 } 3072 3073 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq) 3074 { 3075 struct net *net = sock_net(&tsk->sk); 3076 struct tipc_group *grp = tsk->group; 3077 struct tipc_msg *hdr = &tsk->phdr; 3078 struct tipc_uaddr ua; 3079 int rc; 3080 3081 if (mreq->type < TIPC_RESERVED_TYPES) 3082 return -EACCES; 3083 if (mreq->scope > TIPC_NODE_SCOPE) 3084 return -EINVAL; 3085 if (mreq->scope != TIPC_NODE_SCOPE) 3086 mreq->scope = TIPC_CLUSTER_SCOPE; 3087 if (grp) 3088 return -EACCES; 3089 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open); 3090 if (!grp) 3091 return -ENOMEM; 3092 tsk->group = grp; 3093 msg_set_lookup_scope(hdr, mreq->scope); 3094 msg_set_nametype(hdr, mreq->type); 3095 msg_set_dest_droppable(hdr, true); 3096 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope, 3097 mreq->type, mreq->instance, mreq->instance); 3098 tipc_nametbl_build_group(net, grp, &ua); 3099 rc = tipc_sk_publish(tsk, &ua); 3100 if (rc) { 3101 tipc_group_delete(net, grp); 3102 tsk->group = NULL; 3103 return rc; 3104 } 3105 /* Eliminate any risk that a broadcast overtakes sent JOINs */ 3106 tsk->mc_method.rcast = true; 3107 tsk->mc_method.mandatory = true; 3108 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf); 3109 return rc; 3110 } 3111 3112 static int tipc_sk_leave(struct tipc_sock *tsk) 3113 { 3114 struct net *net = sock_net(&tsk->sk); 3115 struct tipc_group *grp = tsk->group; 3116 struct tipc_uaddr ua; 3117 int scope; 3118 3119 if (!grp) 3120 return -EINVAL; 3121 ua.addrtype = TIPC_SERVICE_RANGE; 3122 tipc_group_self(grp, &ua.sr, &scope); 3123 ua.scope = scope; 3124 tipc_group_delete(net, grp); 3125 tsk->group = NULL; 3126 tipc_sk_withdraw(tsk, &ua); 3127 return 0; 3128 } 3129 3130 /** 3131 * tipc_setsockopt - set socket option 3132 * @sock: socket structure 3133 * @lvl: option level 3134 * @opt: option identifier 3135 * @ov: pointer to new option value 3136 * @ol: length of option value 3137 * 3138 * For stream sockets only, accepts and ignores all IPPROTO_TCP options 3139 * (to ease compatibility). 3140 * 3141 * Return: 0 on success, errno otherwise 3142 */ 3143 static int tipc_setsockopt(struct socket *sock, int lvl, int opt, 3144 sockptr_t ov, unsigned int ol) 3145 { 3146 struct sock *sk = sock->sk; 3147 struct tipc_sock *tsk = tipc_sk(sk); 3148 struct tipc_group_req mreq; 3149 u32 value = 0; 3150 int res = 0; 3151 3152 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3153 return 0; 3154 if (lvl != SOL_TIPC) 3155 return -ENOPROTOOPT; 3156 3157 switch (opt) { 3158 case TIPC_IMPORTANCE: 3159 case TIPC_SRC_DROPPABLE: 3160 case TIPC_DEST_DROPPABLE: 3161 case TIPC_CONN_TIMEOUT: 3162 case TIPC_NODELAY: 3163 if (ol < sizeof(value)) 3164 return -EINVAL; 3165 if (copy_from_sockptr(&value, ov, sizeof(u32))) 3166 return -EFAULT; 3167 break; 3168 case TIPC_GROUP_JOIN: 3169 if (ol < sizeof(mreq)) 3170 return -EINVAL; 3171 if (copy_from_sockptr(&mreq, ov, sizeof(mreq))) 3172 return -EFAULT; 3173 break; 3174 default: 3175 if (!sockptr_is_null(ov) || ol) 3176 return -EINVAL; 3177 } 3178 3179 lock_sock(sk); 3180 3181 switch (opt) { 3182 case TIPC_IMPORTANCE: 3183 res = tsk_set_importance(sk, value); 3184 break; 3185 case TIPC_SRC_DROPPABLE: 3186 if (sock->type != SOCK_STREAM) 3187 tsk_set_unreliable(tsk, value); 3188 else 3189 res = -ENOPROTOOPT; 3190 break; 3191 case TIPC_DEST_DROPPABLE: 3192 tsk_set_unreturnable(tsk, value); 3193 break; 3194 case TIPC_CONN_TIMEOUT: 3195 tipc_sk(sk)->conn_timeout = value; 3196 break; 3197 case TIPC_MCAST_BROADCAST: 3198 tsk->mc_method.rcast = false; 3199 tsk->mc_method.mandatory = true; 3200 break; 3201 case TIPC_MCAST_REPLICAST: 3202 tsk->mc_method.rcast = true; 3203 tsk->mc_method.mandatory = true; 3204 break; 3205 case TIPC_GROUP_JOIN: 3206 res = tipc_sk_join(tsk, &mreq); 3207 break; 3208 case TIPC_GROUP_LEAVE: 3209 res = tipc_sk_leave(tsk); 3210 break; 3211 case TIPC_NODELAY: 3212 tsk->nodelay = !!value; 3213 tsk_set_nagle(tsk); 3214 break; 3215 default: 3216 res = -EINVAL; 3217 } 3218 3219 release_sock(sk); 3220 3221 return res; 3222 } 3223 3224 /** 3225 * tipc_getsockopt - get socket option 3226 * @sock: socket structure 3227 * @lvl: option level 3228 * @opt: option identifier 3229 * @ov: receptacle for option value 3230 * @ol: receptacle for length of option value 3231 * 3232 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options 3233 * (to ease compatibility). 3234 * 3235 * Return: 0 on success, errno otherwise 3236 */ 3237 static int tipc_getsockopt(struct socket *sock, int lvl, int opt, 3238 char __user *ov, int __user *ol) 3239 { 3240 struct sock *sk = sock->sk; 3241 struct tipc_sock *tsk = tipc_sk(sk); 3242 struct tipc_service_range seq; 3243 int len, scope; 3244 u32 value; 3245 int res; 3246 3247 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) 3248 return put_user(0, ol); 3249 if (lvl != SOL_TIPC) 3250 return -ENOPROTOOPT; 3251 res = get_user(len, ol); 3252 if (res) 3253 return res; 3254 3255 lock_sock(sk); 3256 3257 switch (opt) { 3258 case TIPC_IMPORTANCE: 3259 value = tsk_importance(tsk); 3260 break; 3261 case TIPC_SRC_DROPPABLE: 3262 value = tsk_unreliable(tsk); 3263 break; 3264 case TIPC_DEST_DROPPABLE: 3265 value = tsk_unreturnable(tsk); 3266 break; 3267 case TIPC_CONN_TIMEOUT: 3268 value = tsk->conn_timeout; 3269 /* no need to set "res", since already 0 at this point */ 3270 break; 3271 case TIPC_NODE_RECVQ_DEPTH: 3272 value = 0; /* was tipc_queue_size, now obsolete */ 3273 break; 3274 case TIPC_SOCK_RECVQ_DEPTH: 3275 value = skb_queue_len(&sk->sk_receive_queue); 3276 break; 3277 case TIPC_SOCK_RECVQ_USED: 3278 value = sk_rmem_alloc_get(sk); 3279 break; 3280 case TIPC_GROUP_JOIN: 3281 seq.type = 0; 3282 if (tsk->group) 3283 tipc_group_self(tsk->group, &seq, &scope); 3284 value = seq.type; 3285 break; 3286 default: 3287 res = -EINVAL; 3288 } 3289 3290 release_sock(sk); 3291 3292 if (res) 3293 return res; /* "get" failed */ 3294 3295 if (len < sizeof(value)) 3296 return -EINVAL; 3297 3298 if (copy_to_user(ov, &value, sizeof(value))) 3299 return -EFAULT; 3300 3301 return put_user(sizeof(value), ol); 3302 } 3303 3304 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 3305 { 3306 struct net *net = sock_net(sock->sk); 3307 struct tipc_sioc_nodeid_req nr = {0}; 3308 struct tipc_sioc_ln_req lnr; 3309 void __user *argp = (void __user *)arg; 3310 3311 switch (cmd) { 3312 case SIOCGETLINKNAME: 3313 if (copy_from_user(&lnr, argp, sizeof(lnr))) 3314 return -EFAULT; 3315 if (!tipc_node_get_linkname(net, 3316 lnr.bearer_id & 0xffff, lnr.peer, 3317 lnr.linkname, TIPC_MAX_LINK_NAME)) { 3318 if (copy_to_user(argp, &lnr, sizeof(lnr))) 3319 return -EFAULT; 3320 return 0; 3321 } 3322 return -EADDRNOTAVAIL; 3323 case SIOCGETNODEID: 3324 if (copy_from_user(&nr, argp, sizeof(nr))) 3325 return -EFAULT; 3326 if (!tipc_node_get_id(net, nr.peer, nr.node_id)) 3327 return -EADDRNOTAVAIL; 3328 if (copy_to_user(argp, &nr, sizeof(nr))) 3329 return -EFAULT; 3330 return 0; 3331 default: 3332 return -ENOIOCTLCMD; 3333 } 3334 } 3335 3336 static int tipc_socketpair(struct socket *sock1, struct socket *sock2) 3337 { 3338 struct tipc_sock *tsk2 = tipc_sk(sock2->sk); 3339 struct tipc_sock *tsk1 = tipc_sk(sock1->sk); 3340 u32 onode = tipc_own_addr(sock_net(sock1->sk)); 3341 3342 tsk1->peer.family = AF_TIPC; 3343 tsk1->peer.addrtype = TIPC_SOCKET_ADDR; 3344 tsk1->peer.scope = TIPC_NODE_SCOPE; 3345 tsk1->peer.addr.id.ref = tsk2->portid; 3346 tsk1->peer.addr.id.node = onode; 3347 tsk2->peer.family = AF_TIPC; 3348 tsk2->peer.addrtype = TIPC_SOCKET_ADDR; 3349 tsk2->peer.scope = TIPC_NODE_SCOPE; 3350 tsk2->peer.addr.id.ref = tsk1->portid; 3351 tsk2->peer.addr.id.node = onode; 3352 3353 tipc_sk_finish_conn(tsk1, tsk2->portid, onode); 3354 tipc_sk_finish_conn(tsk2, tsk1->portid, onode); 3355 return 0; 3356 } 3357 3358 /* Protocol switches for the various types of TIPC sockets */ 3359 3360 static const struct proto_ops msg_ops = { 3361 .owner = THIS_MODULE, 3362 .family = AF_TIPC, 3363 .release = tipc_release, 3364 .bind = tipc_bind, 3365 .connect = tipc_connect, 3366 .socketpair = tipc_socketpair, 3367 .accept = sock_no_accept, 3368 .getname = tipc_getname, 3369 .poll = tipc_poll, 3370 .ioctl = tipc_ioctl, 3371 .listen = sock_no_listen, 3372 .shutdown = tipc_shutdown, 3373 .setsockopt = tipc_setsockopt, 3374 .getsockopt = tipc_getsockopt, 3375 .sendmsg = tipc_sendmsg, 3376 .recvmsg = tipc_recvmsg, 3377 .mmap = sock_no_mmap, 3378 .sendpage = sock_no_sendpage 3379 }; 3380 3381 static const struct proto_ops packet_ops = { 3382 .owner = THIS_MODULE, 3383 .family = AF_TIPC, 3384 .release = tipc_release, 3385 .bind = tipc_bind, 3386 .connect = tipc_connect, 3387 .socketpair = tipc_socketpair, 3388 .accept = tipc_accept, 3389 .getname = tipc_getname, 3390 .poll = tipc_poll, 3391 .ioctl = tipc_ioctl, 3392 .listen = tipc_listen, 3393 .shutdown = tipc_shutdown, 3394 .setsockopt = tipc_setsockopt, 3395 .getsockopt = tipc_getsockopt, 3396 .sendmsg = tipc_send_packet, 3397 .recvmsg = tipc_recvmsg, 3398 .mmap = sock_no_mmap, 3399 .sendpage = sock_no_sendpage 3400 }; 3401 3402 static const struct proto_ops stream_ops = { 3403 .owner = THIS_MODULE, 3404 .family = AF_TIPC, 3405 .release = tipc_release, 3406 .bind = tipc_bind, 3407 .connect = tipc_connect, 3408 .socketpair = tipc_socketpair, 3409 .accept = tipc_accept, 3410 .getname = tipc_getname, 3411 .poll = tipc_poll, 3412 .ioctl = tipc_ioctl, 3413 .listen = tipc_listen, 3414 .shutdown = tipc_shutdown, 3415 .setsockopt = tipc_setsockopt, 3416 .getsockopt = tipc_getsockopt, 3417 .sendmsg = tipc_sendstream, 3418 .recvmsg = tipc_recvstream, 3419 .mmap = sock_no_mmap, 3420 .sendpage = sock_no_sendpage 3421 }; 3422 3423 static const struct net_proto_family tipc_family_ops = { 3424 .owner = THIS_MODULE, 3425 .family = AF_TIPC, 3426 .create = tipc_sk_create 3427 }; 3428 3429 static struct proto tipc_proto = { 3430 .name = "TIPC", 3431 .owner = THIS_MODULE, 3432 .obj_size = sizeof(struct tipc_sock), 3433 .sysctl_rmem = sysctl_tipc_rmem 3434 }; 3435 3436 /** 3437 * tipc_socket_init - initialize TIPC socket interface 3438 * 3439 * Return: 0 on success, errno otherwise 3440 */ 3441 int tipc_socket_init(void) 3442 { 3443 int res; 3444 3445 res = proto_register(&tipc_proto, 1); 3446 if (res) { 3447 pr_err("Failed to register TIPC protocol type\n"); 3448 goto out; 3449 } 3450 3451 res = sock_register(&tipc_family_ops); 3452 if (res) { 3453 pr_err("Failed to register TIPC socket type\n"); 3454 proto_unregister(&tipc_proto); 3455 goto out; 3456 } 3457 out: 3458 return res; 3459 } 3460 3461 /** 3462 * tipc_socket_stop - stop TIPC socket interface 3463 */ 3464 void tipc_socket_stop(void) 3465 { 3466 sock_unregister(tipc_family_ops.family); 3467 proto_unregister(&tipc_proto); 3468 } 3469 3470 /* Caller should hold socket lock for the passed tipc socket. */ 3471 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) 3472 { 3473 u32 peer_node, peer_port; 3474 u32 conn_type, conn_instance; 3475 struct nlattr *nest; 3476 3477 peer_node = tsk_peer_node(tsk); 3478 peer_port = tsk_peer_port(tsk); 3479 conn_type = msg_nametype(&tsk->phdr); 3480 conn_instance = msg_nameinst(&tsk->phdr); 3481 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON); 3482 if (!nest) 3483 return -EMSGSIZE; 3484 3485 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) 3486 goto msg_full; 3487 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) 3488 goto msg_full; 3489 3490 if (tsk->conn_addrtype != 0) { 3491 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) 3492 goto msg_full; 3493 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type)) 3494 goto msg_full; 3495 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance)) 3496 goto msg_full; 3497 } 3498 nla_nest_end(skb, nest); 3499 3500 return 0; 3501 3502 msg_full: 3503 nla_nest_cancel(skb, nest); 3504 3505 return -EMSGSIZE; 3506 } 3507 3508 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock 3509 *tsk) 3510 { 3511 struct net *net = sock_net(skb->sk); 3512 struct sock *sk = &tsk->sk; 3513 3514 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) || 3515 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net))) 3516 return -EMSGSIZE; 3517 3518 if (tipc_sk_connected(sk)) { 3519 if (__tipc_nl_add_sk_con(skb, tsk)) 3520 return -EMSGSIZE; 3521 } else if (!list_empty(&tsk->publications)) { 3522 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) 3523 return -EMSGSIZE; 3524 } 3525 return 0; 3526 } 3527 3528 /* Caller should hold socket lock for the passed tipc socket. */ 3529 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, 3530 struct tipc_sock *tsk) 3531 { 3532 struct nlattr *attrs; 3533 void *hdr; 3534 3535 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3536 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); 3537 if (!hdr) 3538 goto msg_cancel; 3539 3540 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3541 if (!attrs) 3542 goto genlmsg_cancel; 3543 3544 if (__tipc_nl_add_sk_info(skb, tsk)) 3545 goto attr_msg_cancel; 3546 3547 nla_nest_end(skb, attrs); 3548 genlmsg_end(skb, hdr); 3549 3550 return 0; 3551 3552 attr_msg_cancel: 3553 nla_nest_cancel(skb, attrs); 3554 genlmsg_cancel: 3555 genlmsg_cancel(skb, hdr); 3556 msg_cancel: 3557 return -EMSGSIZE; 3558 } 3559 3560 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb, 3561 int (*skb_handler)(struct sk_buff *skb, 3562 struct netlink_callback *cb, 3563 struct tipc_sock *tsk)) 3564 { 3565 struct rhashtable_iter *iter = (void *)cb->args[4]; 3566 struct tipc_sock *tsk; 3567 int err; 3568 3569 rhashtable_walk_start(iter); 3570 while ((tsk = rhashtable_walk_next(iter)) != NULL) { 3571 if (IS_ERR(tsk)) { 3572 err = PTR_ERR(tsk); 3573 if (err == -EAGAIN) { 3574 err = 0; 3575 continue; 3576 } 3577 break; 3578 } 3579 3580 sock_hold(&tsk->sk); 3581 rhashtable_walk_stop(iter); 3582 lock_sock(&tsk->sk); 3583 err = skb_handler(skb, cb, tsk); 3584 if (err) { 3585 release_sock(&tsk->sk); 3586 sock_put(&tsk->sk); 3587 goto out; 3588 } 3589 release_sock(&tsk->sk); 3590 rhashtable_walk_start(iter); 3591 sock_put(&tsk->sk); 3592 } 3593 rhashtable_walk_stop(iter); 3594 out: 3595 return skb->len; 3596 } 3597 EXPORT_SYMBOL(tipc_nl_sk_walk); 3598 3599 int tipc_dump_start(struct netlink_callback *cb) 3600 { 3601 return __tipc_dump_start(cb, sock_net(cb->skb->sk)); 3602 } 3603 EXPORT_SYMBOL(tipc_dump_start); 3604 3605 int __tipc_dump_start(struct netlink_callback *cb, struct net *net) 3606 { 3607 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */ 3608 struct rhashtable_iter *iter = (void *)cb->args[4]; 3609 struct tipc_net *tn = tipc_net(net); 3610 3611 if (!iter) { 3612 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 3613 if (!iter) 3614 return -ENOMEM; 3615 3616 cb->args[4] = (long)iter; 3617 } 3618 3619 rhashtable_walk_enter(&tn->sk_rht, iter); 3620 return 0; 3621 } 3622 3623 int tipc_dump_done(struct netlink_callback *cb) 3624 { 3625 struct rhashtable_iter *hti = (void *)cb->args[4]; 3626 3627 rhashtable_walk_exit(hti); 3628 kfree(hti); 3629 return 0; 3630 } 3631 EXPORT_SYMBOL(tipc_dump_done); 3632 3633 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb, 3634 struct tipc_sock *tsk, u32 sk_filter_state, 3635 u64 (*tipc_diag_gen_cookie)(struct sock *sk)) 3636 { 3637 struct sock *sk = &tsk->sk; 3638 struct nlattr *attrs; 3639 struct nlattr *stat; 3640 3641 /*filter response w.r.t sk_state*/ 3642 if (!(sk_filter_state & (1 << sk->sk_state))) 3643 return 0; 3644 3645 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK); 3646 if (!attrs) 3647 goto msg_cancel; 3648 3649 if (__tipc_nl_add_sk_info(skb, tsk)) 3650 goto attr_msg_cancel; 3651 3652 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) || 3653 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) || 3654 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) || 3655 nla_put_u32(skb, TIPC_NLA_SOCK_UID, 3656 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk), 3657 sock_i_uid(sk))) || 3658 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE, 3659 tipc_diag_gen_cookie(sk), 3660 TIPC_NLA_SOCK_PAD)) 3661 goto attr_msg_cancel; 3662 3663 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT); 3664 if (!stat) 3665 goto attr_msg_cancel; 3666 3667 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ, 3668 skb_queue_len(&sk->sk_receive_queue)) || 3669 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ, 3670 skb_queue_len(&sk->sk_write_queue)) || 3671 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP, 3672 atomic_read(&sk->sk_drops))) 3673 goto stat_msg_cancel; 3674 3675 if (tsk->cong_link_cnt && 3676 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG)) 3677 goto stat_msg_cancel; 3678 3679 if (tsk_conn_cong(tsk) && 3680 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG)) 3681 goto stat_msg_cancel; 3682 3683 nla_nest_end(skb, stat); 3684 3685 if (tsk->group) 3686 if (tipc_group_fill_sock_diag(tsk->group, skb)) 3687 goto stat_msg_cancel; 3688 3689 nla_nest_end(skb, attrs); 3690 3691 return 0; 3692 3693 stat_msg_cancel: 3694 nla_nest_cancel(skb, stat); 3695 attr_msg_cancel: 3696 nla_nest_cancel(skb, attrs); 3697 msg_cancel: 3698 return -EMSGSIZE; 3699 } 3700 EXPORT_SYMBOL(tipc_sk_fill_sock_diag); 3701 3702 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) 3703 { 3704 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk); 3705 } 3706 3707 /* Caller should hold socket lock for the passed tipc socket. */ 3708 static int __tipc_nl_add_sk_publ(struct sk_buff *skb, 3709 struct netlink_callback *cb, 3710 struct publication *publ) 3711 { 3712 void *hdr; 3713 struct nlattr *attrs; 3714 3715 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 3716 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); 3717 if (!hdr) 3718 goto msg_cancel; 3719 3720 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL); 3721 if (!attrs) 3722 goto genlmsg_cancel; 3723 3724 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) 3725 goto attr_msg_cancel; 3726 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type)) 3727 goto attr_msg_cancel; 3728 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower)) 3729 goto attr_msg_cancel; 3730 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper)) 3731 goto attr_msg_cancel; 3732 3733 nla_nest_end(skb, attrs); 3734 genlmsg_end(skb, hdr); 3735 3736 return 0; 3737 3738 attr_msg_cancel: 3739 nla_nest_cancel(skb, attrs); 3740 genlmsg_cancel: 3741 genlmsg_cancel(skb, hdr); 3742 msg_cancel: 3743 return -EMSGSIZE; 3744 } 3745 3746 /* Caller should hold socket lock for the passed tipc socket. */ 3747 static int __tipc_nl_list_sk_publ(struct sk_buff *skb, 3748 struct netlink_callback *cb, 3749 struct tipc_sock *tsk, u32 *last_publ) 3750 { 3751 int err; 3752 struct publication *p; 3753 3754 if (*last_publ) { 3755 list_for_each_entry(p, &tsk->publications, binding_sock) { 3756 if (p->key == *last_publ) 3757 break; 3758 } 3759 if (list_entry_is_head(p, &tsk->publications, binding_sock)) { 3760 /* We never set seq or call nl_dump_check_consistent() 3761 * this means that setting prev_seq here will cause the 3762 * consistence check to fail in the netlink callback 3763 * handler. Resulting in the last NLMSG_DONE message 3764 * having the NLM_F_DUMP_INTR flag set. 3765 */ 3766 cb->prev_seq = 1; 3767 *last_publ = 0; 3768 return -EPIPE; 3769 } 3770 } else { 3771 p = list_first_entry(&tsk->publications, struct publication, 3772 binding_sock); 3773 } 3774 3775 list_for_each_entry_from(p, &tsk->publications, binding_sock) { 3776 err = __tipc_nl_add_sk_publ(skb, cb, p); 3777 if (err) { 3778 *last_publ = p->key; 3779 return err; 3780 } 3781 } 3782 *last_publ = 0; 3783 3784 return 0; 3785 } 3786 3787 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) 3788 { 3789 int err; 3790 u32 tsk_portid = cb->args[0]; 3791 u32 last_publ = cb->args[1]; 3792 u32 done = cb->args[2]; 3793 struct net *net = sock_net(skb->sk); 3794 struct tipc_sock *tsk; 3795 3796 if (!tsk_portid) { 3797 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 3798 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; 3799 3800 if (!attrs[TIPC_NLA_SOCK]) 3801 return -EINVAL; 3802 3803 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX, 3804 attrs[TIPC_NLA_SOCK], 3805 tipc_nl_sock_policy, NULL); 3806 if (err) 3807 return err; 3808 3809 if (!sock[TIPC_NLA_SOCK_REF]) 3810 return -EINVAL; 3811 3812 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); 3813 } 3814 3815 if (done) 3816 return 0; 3817 3818 tsk = tipc_sk_lookup(net, tsk_portid); 3819 if (!tsk) 3820 return -EINVAL; 3821 3822 lock_sock(&tsk->sk); 3823 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); 3824 if (!err) 3825 done = 1; 3826 release_sock(&tsk->sk); 3827 sock_put(&tsk->sk); 3828 3829 cb->args[0] = tsk_portid; 3830 cb->args[1] = last_publ; 3831 cb->args[2] = done; 3832 3833 return skb->len; 3834 } 3835 3836 /** 3837 * tipc_sk_filtering - check if a socket should be traced 3838 * @sk: the socket to be examined 3839 * 3840 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering: 3841 * (portid, sock type, name type, name lower, name upper) 3842 * 3843 * Return: true if the socket meets the socket tuple data 3844 * (value 0 = 'any') or when there is no tuple set (all = 0), 3845 * otherwise false 3846 */ 3847 bool tipc_sk_filtering(struct sock *sk) 3848 { 3849 struct tipc_sock *tsk; 3850 struct publication *p; 3851 u32 _port, _sktype, _type, _lower, _upper; 3852 u32 type = 0, lower = 0, upper = 0; 3853 3854 if (!sk) 3855 return true; 3856 3857 tsk = tipc_sk(sk); 3858 3859 _port = sysctl_tipc_sk_filter[0]; 3860 _sktype = sysctl_tipc_sk_filter[1]; 3861 _type = sysctl_tipc_sk_filter[2]; 3862 _lower = sysctl_tipc_sk_filter[3]; 3863 _upper = sysctl_tipc_sk_filter[4]; 3864 3865 if (!_port && !_sktype && !_type && !_lower && !_upper) 3866 return true; 3867 3868 if (_port) 3869 return (_port == tsk->portid); 3870 3871 if (_sktype && _sktype != sk->sk_type) 3872 return false; 3873 3874 if (tsk->published) { 3875 p = list_first_entry_or_null(&tsk->publications, 3876 struct publication, binding_sock); 3877 if (p) { 3878 type = p->sr.type; 3879 lower = p->sr.lower; 3880 upper = p->sr.upper; 3881 } 3882 } 3883 3884 if (!tipc_sk_type_connectionless(sk)) { 3885 type = msg_nametype(&tsk->phdr); 3886 lower = msg_nameinst(&tsk->phdr); 3887 upper = lower; 3888 } 3889 3890 if ((_type && _type != type) || (_lower && _lower != lower) || 3891 (_upper && _upper != upper)) 3892 return false; 3893 3894 return true; 3895 } 3896 3897 u32 tipc_sock_get_portid(struct sock *sk) 3898 { 3899 return (sk) ? (tipc_sk(sk))->portid : 0; 3900 } 3901 3902 /** 3903 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded, 3904 * both the rcv and backlog queues are considered 3905 * @sk: tipc sk to be checked 3906 * @skb: tipc msg to be checked 3907 * 3908 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3909 */ 3910 3911 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb) 3912 { 3913 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt; 3914 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); 3915 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk); 3916 3917 return (qsize > lim * 90 / 100); 3918 } 3919 3920 /** 3921 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded, 3922 * only the rcv queue is considered 3923 * @sk: tipc sk to be checked 3924 * @skb: tipc msg to be checked 3925 * 3926 * Return: true if the socket rx queue allocation is > 90%, otherwise false 3927 */ 3928 3929 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb) 3930 { 3931 unsigned int lim = rcvbuf_limit(sk, skb); 3932 unsigned int qsize = sk_rmem_alloc_get(sk); 3933 3934 return (qsize > lim * 90 / 100); 3935 } 3936 3937 /** 3938 * tipc_sk_dump - dump TIPC socket 3939 * @sk: tipc sk to be dumped 3940 * @dqueues: bitmask to decide if any socket queue to be dumped? 3941 * - TIPC_DUMP_NONE: don't dump socket queues 3942 * - TIPC_DUMP_SK_SNDQ: dump socket send queue 3943 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue 3944 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue 3945 * - TIPC_DUMP_ALL: dump all the socket queues above 3946 * @buf: returned buffer of dump data in format 3947 */ 3948 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf) 3949 { 3950 int i = 0; 3951 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN; 3952 u32 conn_type, conn_instance; 3953 struct tipc_sock *tsk; 3954 struct publication *p; 3955 bool tsk_connected; 3956 3957 if (!sk) { 3958 i += scnprintf(buf, sz, "sk data: (null)\n"); 3959 return i; 3960 } 3961 3962 tsk = tipc_sk(sk); 3963 tsk_connected = !tipc_sk_type_connectionless(sk); 3964 3965 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type); 3966 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state); 3967 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk)); 3968 i += scnprintf(buf + i, sz - i, " %u", tsk->portid); 3969 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected); 3970 if (tsk_connected) { 3971 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk)); 3972 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk)); 3973 conn_type = msg_nametype(&tsk->phdr); 3974 conn_instance = msg_nameinst(&tsk->phdr); 3975 i += scnprintf(buf + i, sz - i, " %u", conn_type); 3976 i += scnprintf(buf + i, sz - i, " %u", conn_instance); 3977 } 3978 i += scnprintf(buf + i, sz - i, " | %u", tsk->published); 3979 if (tsk->published) { 3980 p = list_first_entry_or_null(&tsk->publications, 3981 struct publication, binding_sock); 3982 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0); 3983 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0); 3984 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0); 3985 } 3986 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win); 3987 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win); 3988 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt); 3989 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps); 3990 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt); 3991 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked); 3992 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked); 3993 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt)); 3994 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown); 3995 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk)); 3996 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf); 3997 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk)); 3998 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf); 3999 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len)); 4000 4001 if (dqueues & TIPC_DUMP_SK_SNDQ) { 4002 i += scnprintf(buf + i, sz - i, "sk_write_queue: "); 4003 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i); 4004 } 4005 4006 if (dqueues & TIPC_DUMP_SK_RCVQ) { 4007 i += scnprintf(buf + i, sz - i, "sk_receive_queue: "); 4008 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i); 4009 } 4010 4011 if (dqueues & TIPC_DUMP_SK_BKLGQ) { 4012 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head "); 4013 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i); 4014 if (sk->sk_backlog.tail != sk->sk_backlog.head) { 4015 i += scnprintf(buf + i, sz - i, " tail "); 4016 i += tipc_skb_dump(sk->sk_backlog.tail, false, 4017 buf + i); 4018 } 4019 } 4020 4021 return i; 4022 } 4023