1/* 2 * net/tipc/link.c: TIPC link code 3 * 4 * Copyright (c) 1996-2007, 2012-2016, Ericsson AB 5 * Copyright (c) 2004-2007, 2010-2013, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37#include "core.h" 38#include "subscr.h" 39#include "link.h" 40#include "bcast.h" 41#include "socket.h" 42#include "name_distr.h" 43#include "discover.h" 44#include "netlink.h" 45#include "monitor.h" 46#include "trace.h" 47#include "crypto.h" 48 49#include <linux/pkt_sched.h> 50 51struct tipc_stats { 52 u32 sent_pkts; 53 u32 recv_pkts; 54 u32 sent_states; 55 u32 recv_states; 56 u32 sent_probes; 57 u32 recv_probes; 58 u32 sent_nacks; 59 u32 recv_nacks; 60 u32 sent_acks; 61 u32 sent_bundled; 62 u32 sent_bundles; 63 u32 recv_bundled; 64 u32 recv_bundles; 65 u32 retransmitted; 66 u32 sent_fragmented; 67 u32 sent_fragments; 68 u32 recv_fragmented; 69 u32 recv_fragments; 70 u32 link_congs; /* # port sends blocked by congestion */ 71 u32 deferred_recv; 72 u32 duplicates; 73 u32 max_queue_sz; /* send queue size high water mark */ 74 u32 accu_queue_sz; /* used for send queue size profiling */ 75 u32 queue_sz_counts; /* used for send queue size profiling */ 76 u32 msg_length_counts; /* used for message length profiling */ 77 u32 msg_lengths_total; /* used for message length profiling */ 78 u32 msg_length_profile[7]; /* used for msg. length profiling */ 79}; 80 81/** 82 * struct tipc_link - TIPC link data structure 83 * @addr: network address of link's peer node 84 * @name: link name character string 85 * @net: pointer to namespace struct 86 * @peer_session: link session # being used by peer end of link 87 * @peer_bearer_id: bearer id used by link's peer endpoint 88 * @bearer_id: local bearer id used by link 89 * @tolerance: minimum link continuity loss needed to reset link [in ms] 90 * @abort_limit: # of unacknowledged continuity probes needed to reset link 91 * @state: current state of link FSM 92 * @peer_caps: bitmap describing capabilities of peer node 93 * @silent_intv_cnt: # of timer intervals without any reception from peer 94 * @priority: current link priority 95 * @net_plane: current link network plane ('A' through 'H') 96 * @mon_state: cookie with information needed by link monitor 97 * @mtu: current maximum packet size for this link 98 * @advertised_mtu: advertised own mtu when link is being established 99 * @backlogq: queue for messages waiting to be sent 100 * @ackers: # of peers that needs to ack each packet before it can be released 101 * @acked: # last packet acked by a certain peer. Used for broadcast. 102 * @rcv_nxt: next sequence number to expect for inbound messages 103 * @inputq: buffer queue for messages to be delivered upwards 104 * @namedq: buffer queue for name table messages to be delivered upwards 105 * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate 106 * @reasm_buf: head of partially reassembled inbound message fragments 107 * @stats: collects statistics regarding link activity 108 * @session: session to be used by link 109 * @snd_nxt_state: next send seq number 110 * @rcv_nxt_state: next rcv seq number 111 * @in_session: have received ACTIVATE_MSG from peer 112 * @active: link is active 113 * @if_name: associated interface name 114 * @rst_cnt: link reset counter 115 * @drop_point: seq number for failover handling (FIXME) 116 * @failover_reasm_skb: saved failover msg ptr (FIXME) 117 * @failover_deferdq: deferred message queue for failover processing (FIXME) 118 * @transmq: the link's transmit queue 119 * @backlog: link's backlog by priority (importance) 120 * @snd_nxt: next sequence number to be used 121 * @rcv_unacked: # messages read by user, but not yet acked back to peer 122 * @deferdq: deferred receive queue 123 * @window: sliding window size for congestion handling 124 * @min_win: minimal send window to be used by link 125 * @ssthresh: slow start threshold for congestion handling 126 * @max_win: maximal send window to be used by link 127 * @cong_acks: congestion acks for congestion avoidance (FIXME) 128 * @checkpoint: seq number for congestion window size handling 129 * @reasm_tnlmsg: fragmentation/reassembly area for tunnel protocol message 130 * @last_gap: last gap ack blocks for bcast (FIXME) 131 * @last_ga: ptr to gap ack blocks 132 * @bc_rcvlink: the peer specific link used for broadcast reception 133 * @bc_sndlink: the namespace global link used for broadcast sending 134 * @nack_state: bcast nack state 135 * @bc_peer_is_up: peer has acked the bcast init msg 136 */ 137struct tipc_link { 138 u32 addr; 139 char name[TIPC_MAX_LINK_NAME]; 140 struct net *net; 141 142 /* Management and link supervision data */ 143 u16 peer_session; 144 u16 session; 145 u16 snd_nxt_state; 146 u16 rcv_nxt_state; 147 u32 peer_bearer_id; 148 u32 bearer_id; 149 u32 tolerance; 150 u32 abort_limit; 151 u32 state; 152 u16 peer_caps; 153 bool in_session; 154 bool active; 155 u32 silent_intv_cnt; 156 char if_name[TIPC_MAX_IF_NAME]; 157 u32 priority; 158 char net_plane; 159 struct tipc_mon_state mon_state; 160 u16 rst_cnt; 161 162 /* Failover/synch */ 163 u16 drop_point; 164 struct sk_buff *failover_reasm_skb; 165 struct sk_buff_head failover_deferdq; 166 167 /* Max packet negotiation */ 168 u16 mtu; 169 u16 advertised_mtu; 170 171 /* Sending */ 172 struct sk_buff_head transmq; 173 struct sk_buff_head backlogq; 174 struct { 175 u16 len; 176 u16 limit; 177 struct sk_buff *target_bskb; 178 } backlog[5]; 179 u16 snd_nxt; 180 181 /* Reception */ 182 u16 rcv_nxt; 183 u32 rcv_unacked; 184 struct sk_buff_head deferdq; 185 struct sk_buff_head *inputq; 186 struct sk_buff_head *namedq; 187 188 /* Congestion handling */ 189 struct sk_buff_head wakeupq; 190 u16 window; 191 u16 min_win; 192 u16 ssthresh; 193 u16 max_win; 194 u16 cong_acks; 195 u16 checkpoint; 196 197 /* Fragmentation/reassembly */ 198 struct sk_buff *reasm_buf; 199 struct sk_buff *reasm_tnlmsg; 200 201 /* Broadcast */ 202 u16 ackers; 203 u16 acked; 204 u16 last_gap; 205 struct tipc_gap_ack_blks *last_ga; 206 struct tipc_link *bc_rcvlink; 207 struct tipc_link *bc_sndlink; 208 u8 nack_state; 209 bool bc_peer_is_up; 210 211 /* Statistics */ 212 struct tipc_stats stats; 213}; 214 215/* 216 * Error message prefixes 217 */ 218static const char *link_co_err = "Link tunneling error, "; 219static const char *link_rst_msg = "Resetting link "; 220 221/* Send states for broadcast NACKs 222 */ 223enum { 224 BC_NACK_SND_CONDITIONAL, 225 BC_NACK_SND_UNCONDITIONAL, 226 BC_NACK_SND_SUPPRESS, 227}; 228 229#define TIPC_BC_RETR_LIM (jiffies + msecs_to_jiffies(10)) 230#define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1)) 231 232/* Link FSM states: 233 */ 234enum { 235 LINK_ESTABLISHED = 0xe, 236 LINK_ESTABLISHING = 0xe << 4, 237 LINK_RESET = 0x1 << 8, 238 LINK_RESETTING = 0x2 << 12, 239 LINK_PEER_RESET = 0xd << 16, 240 LINK_FAILINGOVER = 0xf << 20, 241 LINK_SYNCHING = 0xc << 24 242}; 243 244/* Link FSM state checking routines 245 */ 246static int link_is_up(struct tipc_link *l) 247{ 248 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); 249} 250 251static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, 252 struct sk_buff_head *xmitq); 253static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, 254 bool probe_reply, u16 rcvgap, 255 int tolerance, int priority, 256 struct sk_buff_head *xmitq); 257static void link_print(struct tipc_link *l, const char *str); 258static int tipc_link_build_nack_msg(struct tipc_link *l, 259 struct sk_buff_head *xmitq); 260static void tipc_link_build_bc_init_msg(struct tipc_link *l, 261 struct sk_buff_head *xmitq); 262static u8 __tipc_build_gap_ack_blks(struct tipc_gap_ack_blks *ga, 263 struct tipc_link *l, u8 start_index); 264static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr); 265static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r, 266 u16 acked, u16 gap, 267 struct tipc_gap_ack_blks *ga, 268 struct sk_buff_head *xmitq, 269 bool *retransmitted, int *rc); 270static void tipc_link_update_cwin(struct tipc_link *l, int released, 271 bool retransmitted); 272/* 273 * Simple non-static link routines (i.e. referenced outside this file) 274 */ 275bool tipc_link_is_up(struct tipc_link *l) 276{ 277 return link_is_up(l); 278} 279 280bool tipc_link_peer_is_down(struct tipc_link *l) 281{ 282 return l->state == LINK_PEER_RESET; 283} 284 285bool tipc_link_is_reset(struct tipc_link *l) 286{ 287 return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); 288} 289 290bool tipc_link_is_establishing(struct tipc_link *l) 291{ 292 return l->state == LINK_ESTABLISHING; 293} 294 295bool tipc_link_is_synching(struct tipc_link *l) 296{ 297 return l->state == LINK_SYNCHING; 298} 299 300bool tipc_link_is_failingover(struct tipc_link *l) 301{ 302 return l->state == LINK_FAILINGOVER; 303} 304 305bool tipc_link_is_blocked(struct tipc_link *l) 306{ 307 return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); 308} 309 310static bool link_is_bc_sndlink(struct tipc_link *l) 311{ 312 return !l->bc_sndlink; 313} 314 315static bool link_is_bc_rcvlink(struct tipc_link *l) 316{ 317 return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); 318} 319 320void tipc_link_set_active(struct tipc_link *l, bool active) 321{ 322 l->active = active; 323} 324 325u32 tipc_link_id(struct tipc_link *l) 326{ 327 return l->peer_bearer_id << 16 | l->bearer_id; 328} 329 330int tipc_link_min_win(struct tipc_link *l) 331{ 332 return l->min_win; 333} 334 335int tipc_link_max_win(struct tipc_link *l) 336{ 337 return l->max_win; 338} 339 340int tipc_link_prio(struct tipc_link *l) 341{ 342 return l->priority; 343} 344 345unsigned long tipc_link_tolerance(struct tipc_link *l) 346{ 347 return l->tolerance; 348} 349 350struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) 351{ 352 return l->inputq; 353} 354 355char tipc_link_plane(struct tipc_link *l) 356{ 357 return l->net_plane; 358} 359 360struct net *tipc_link_net(struct tipc_link *l) 361{ 362 return l->net; 363} 364 365void tipc_link_update_caps(struct tipc_link *l, u16 capabilities) 366{ 367 l->peer_caps = capabilities; 368} 369 370void tipc_link_add_bc_peer(struct tipc_link *snd_l, 371 struct tipc_link *uc_l, 372 struct sk_buff_head *xmitq) 373{ 374 struct tipc_link *rcv_l = uc_l->bc_rcvlink; 375 376 snd_l->ackers++; 377 rcv_l->acked = snd_l->snd_nxt - 1; 378 snd_l->state = LINK_ESTABLISHED; 379 tipc_link_build_bc_init_msg(uc_l, xmitq); 380} 381 382void tipc_link_remove_bc_peer(struct tipc_link *snd_l, 383 struct tipc_link *rcv_l, 384 struct sk_buff_head *xmitq) 385{ 386 u16 ack = snd_l->snd_nxt - 1; 387 388 snd_l->ackers--; 389 rcv_l->bc_peer_is_up = true; 390 rcv_l->state = LINK_ESTABLISHED; 391 tipc_link_bc_ack_rcv(rcv_l, ack, 0, NULL, xmitq, NULL); 392 trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!"); 393 tipc_link_reset(rcv_l); 394 rcv_l->state = LINK_RESET; 395 if (!snd_l->ackers) { 396 trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!"); 397 tipc_link_reset(snd_l); 398 snd_l->state = LINK_RESET; 399 __skb_queue_purge(xmitq); 400 } 401} 402 403int tipc_link_bc_peers(struct tipc_link *l) 404{ 405 return l->ackers; 406} 407 408static u16 link_bc_rcv_gap(struct tipc_link *l) 409{ 410 struct sk_buff *skb = skb_peek(&l->deferdq); 411 u16 gap = 0; 412 413 if (more(l->snd_nxt, l->rcv_nxt)) 414 gap = l->snd_nxt - l->rcv_nxt; 415 if (skb) 416 gap = buf_seqno(skb) - l->rcv_nxt; 417 return gap; 418} 419 420void tipc_link_set_mtu(struct tipc_link *l, int mtu) 421{ 422 l->mtu = mtu; 423} 424 425int tipc_link_mtu(struct tipc_link *l) 426{ 427 return l->mtu; 428} 429 430int tipc_link_mss(struct tipc_link *l) 431{ 432#ifdef CONFIG_TIPC_CRYPTO 433 return l->mtu - INT_H_SIZE - EMSG_OVERHEAD; 434#else 435 return l->mtu - INT_H_SIZE; 436#endif 437} 438 439u16 tipc_link_rcv_nxt(struct tipc_link *l) 440{ 441 return l->rcv_nxt; 442} 443 444u16 tipc_link_acked(struct tipc_link *l) 445{ 446 return l->acked; 447} 448 449char *tipc_link_name(struct tipc_link *l) 450{ 451 return l->name; 452} 453 454u32 tipc_link_state(struct tipc_link *l) 455{ 456 return l->state; 457} 458 459/** 460 * tipc_link_create - create a new link 461 * @net: pointer to associated network namespace 462 * @if_name: associated interface name 463 * @bearer_id: id (index) of associated bearer 464 * @tolerance: link tolerance to be used by link 465 * @net_plane: network plane (A,B,c..) this link belongs to 466 * @mtu: mtu to be advertised by link 467 * @priority: priority to be used by link 468 * @min_win: minimal send window to be used by link 469 * @max_win: maximal send window to be used by link 470 * @session: session to be used by link 471 * @peer: node id of peer node 472 * @peer_caps: bitmap describing peer node capabilities 473 * @bc_sndlink: the namespace global link used for broadcast sending 474 * @bc_rcvlink: the peer specific link used for broadcast reception 475 * @inputq: queue to put messages ready for delivery 476 * @namedq: queue to put binding table update messages ready for delivery 477 * @link: return value, pointer to put the created link 478 * @self: local unicast link id 479 * @peer_id: 128-bit ID of peer 480 * 481 * Return: true if link was created, otherwise false 482 */ 483bool tipc_link_create(struct net *net, char *if_name, int bearer_id, 484 int tolerance, char net_plane, u32 mtu, int priority, 485 u32 min_win, u32 max_win, u32 session, u32 self, 486 u32 peer, u8 *peer_id, u16 peer_caps, 487 struct tipc_link *bc_sndlink, 488 struct tipc_link *bc_rcvlink, 489 struct sk_buff_head *inputq, 490 struct sk_buff_head *namedq, 491 struct tipc_link **link) 492{ 493 char peer_str[NODE_ID_STR_LEN] = {0,}; 494 char self_str[NODE_ID_STR_LEN] = {0,}; 495 struct tipc_link *l; 496 497 l = kzalloc(sizeof(*l), GFP_ATOMIC); 498 if (!l) 499 return false; 500 *link = l; 501 l->session = session; 502 503 /* Set link name for unicast links only */ 504 if (peer_id) { 505 tipc_nodeid2string(self_str, tipc_own_id(net)); 506 if (strlen(self_str) > 16) 507 sprintf(self_str, "%x", self); 508 tipc_nodeid2string(peer_str, peer_id); 509 if (strlen(peer_str) > 16) 510 sprintf(peer_str, "%x", peer); 511 } 512 /* Peer i/f name will be completed by reset/activate message */ 513 snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown", 514 self_str, if_name, peer_str); 515 516 strcpy(l->if_name, if_name); 517 l->addr = peer; 518 l->peer_caps = peer_caps; 519 l->net = net; 520 l->in_session = false; 521 l->bearer_id = bearer_id; 522 l->tolerance = tolerance; 523 if (bc_rcvlink) 524 bc_rcvlink->tolerance = tolerance; 525 l->net_plane = net_plane; 526 l->advertised_mtu = mtu; 527 l->mtu = mtu; 528 l->priority = priority; 529 tipc_link_set_queue_limits(l, min_win, max_win); 530 l->ackers = 1; 531 l->bc_sndlink = bc_sndlink; 532 l->bc_rcvlink = bc_rcvlink; 533 l->inputq = inputq; 534 l->namedq = namedq; 535 l->state = LINK_RESETTING; 536 __skb_queue_head_init(&l->transmq); 537 __skb_queue_head_init(&l->backlogq); 538 __skb_queue_head_init(&l->deferdq); 539 __skb_queue_head_init(&l->failover_deferdq); 540 skb_queue_head_init(&l->wakeupq); 541 skb_queue_head_init(l->inputq); 542 return true; 543} 544 545/** 546 * tipc_link_bc_create - create new link to be used for broadcast 547 * @net: pointer to associated network namespace 548 * @mtu: mtu to be used initially if no peers 549 * @min_win: minimal send window to be used by link 550 * @max_win: maximal send window to be used by link 551 * @inputq: queue to put messages ready for delivery 552 * @namedq: queue to put binding table update messages ready for delivery 553 * @link: return value, pointer to put the created link 554 * @ownnode: identity of own node 555 * @peer: node id of peer node 556 * @peer_id: 128-bit ID of peer 557 * @peer_caps: bitmap describing peer node capabilities 558 * @bc_sndlink: the namespace global link used for broadcast sending 559 * 560 * Return: true if link was created, otherwise false 561 */ 562bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, u8 *peer_id, 563 int mtu, u32 min_win, u32 max_win, u16 peer_caps, 564 struct sk_buff_head *inputq, 565 struct sk_buff_head *namedq, 566 struct tipc_link *bc_sndlink, 567 struct tipc_link **link) 568{ 569 struct tipc_link *l; 570 571 if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, min_win, 572 max_win, 0, ownnode, peer, NULL, peer_caps, 573 bc_sndlink, NULL, inputq, namedq, link)) 574 return false; 575 576 l = *link; 577 if (peer_id) { 578 char peer_str[NODE_ID_STR_LEN] = {0,}; 579 580 tipc_nodeid2string(peer_str, peer_id); 581 if (strlen(peer_str) > 16) 582 sprintf(peer_str, "%x", peer); 583 /* Broadcast receiver link name: "broadcast-link:<peer>" */ 584 snprintf(l->name, sizeof(l->name), "%s:%s", tipc_bclink_name, 585 peer_str); 586 } else { 587 strcpy(l->name, tipc_bclink_name); 588 } 589 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!"); 590 tipc_link_reset(l); 591 l->state = LINK_RESET; 592 l->ackers = 0; 593 l->bc_rcvlink = l; 594 595 /* Broadcast send link is always up */ 596 if (link_is_bc_sndlink(l)) 597 l->state = LINK_ESTABLISHED; 598 599 /* Disable replicast if even a single peer doesn't support it */ 600 if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) 601 tipc_bcast_toggle_rcast(net, false); 602 603 return true; 604} 605 606/** 607 * tipc_link_fsm_evt - link finite state machine 608 * @l: pointer to link 609 * @evt: state machine event to be processed 610 */ 611int tipc_link_fsm_evt(struct tipc_link *l, int evt) 612{ 613 int rc = 0; 614 int old_state = l->state; 615 616 switch (l->state) { 617 case LINK_RESETTING: 618 switch (evt) { 619 case LINK_PEER_RESET_EVT: 620 l->state = LINK_PEER_RESET; 621 break; 622 case LINK_RESET_EVT: 623 l->state = LINK_RESET; 624 break; 625 case LINK_FAILURE_EVT: 626 case LINK_FAILOVER_BEGIN_EVT: 627 case LINK_ESTABLISH_EVT: 628 case LINK_FAILOVER_END_EVT: 629 case LINK_SYNCH_BEGIN_EVT: 630 case LINK_SYNCH_END_EVT: 631 default: 632 goto illegal_evt; 633 } 634 break; 635 case LINK_RESET: 636 switch (evt) { 637 case LINK_PEER_RESET_EVT: 638 l->state = LINK_ESTABLISHING; 639 break; 640 case LINK_FAILOVER_BEGIN_EVT: 641 l->state = LINK_FAILINGOVER; 642 break; 643 case LINK_FAILURE_EVT: 644 case LINK_RESET_EVT: 645 case LINK_ESTABLISH_EVT: 646 case LINK_FAILOVER_END_EVT: 647 break; 648 case LINK_SYNCH_BEGIN_EVT: 649 case LINK_SYNCH_END_EVT: 650 default: 651 goto illegal_evt; 652 } 653 break; 654 case LINK_PEER_RESET: 655 switch (evt) { 656 case LINK_RESET_EVT: 657 l->state = LINK_ESTABLISHING; 658 break; 659 case LINK_PEER_RESET_EVT: 660 case LINK_ESTABLISH_EVT: 661 case LINK_FAILURE_EVT: 662 break; 663 case LINK_SYNCH_BEGIN_EVT: 664 case LINK_SYNCH_END_EVT: 665 case LINK_FAILOVER_BEGIN_EVT: 666 case LINK_FAILOVER_END_EVT: 667 default: 668 goto illegal_evt; 669 } 670 break; 671 case LINK_FAILINGOVER: 672 switch (evt) { 673 case LINK_FAILOVER_END_EVT: 674 l->state = LINK_RESET; 675 break; 676 case LINK_PEER_RESET_EVT: 677 case LINK_RESET_EVT: 678 case LINK_ESTABLISH_EVT: 679 case LINK_FAILURE_EVT: 680 break; 681 case LINK_FAILOVER_BEGIN_EVT: 682 case LINK_SYNCH_BEGIN_EVT: 683 case LINK_SYNCH_END_EVT: 684 default: 685 goto illegal_evt; 686 } 687 break; 688 case LINK_ESTABLISHING: 689 switch (evt) { 690 case LINK_ESTABLISH_EVT: 691 l->state = LINK_ESTABLISHED; 692 break; 693 case LINK_FAILOVER_BEGIN_EVT: 694 l->state = LINK_FAILINGOVER; 695 break; 696 case LINK_RESET_EVT: 697 l->state = LINK_RESET; 698 break; 699 case LINK_FAILURE_EVT: 700 case LINK_PEER_RESET_EVT: 701 case LINK_SYNCH_BEGIN_EVT: 702 case LINK_FAILOVER_END_EVT: 703 break; 704 case LINK_SYNCH_END_EVT: 705 default: 706 goto illegal_evt; 707 } 708 break; 709 case LINK_ESTABLISHED: 710 switch (evt) { 711 case LINK_PEER_RESET_EVT: 712 l->state = LINK_PEER_RESET; 713 rc |= TIPC_LINK_DOWN_EVT; 714 break; 715 case LINK_FAILURE_EVT: 716 l->state = LINK_RESETTING; 717 rc |= TIPC_LINK_DOWN_EVT; 718 break; 719 case LINK_RESET_EVT: 720 l->state = LINK_RESET; 721 break; 722 case LINK_ESTABLISH_EVT: 723 case LINK_SYNCH_END_EVT: 724 break; 725 case LINK_SYNCH_BEGIN_EVT: 726 l->state = LINK_SYNCHING; 727 break; 728 case LINK_FAILOVER_BEGIN_EVT: 729 case LINK_FAILOVER_END_EVT: 730 default: 731 goto illegal_evt; 732 } 733 break; 734 case LINK_SYNCHING: 735 switch (evt) { 736 case LINK_PEER_RESET_EVT: 737 l->state = LINK_PEER_RESET; 738 rc |= TIPC_LINK_DOWN_EVT; 739 break; 740 case LINK_FAILURE_EVT: 741 l->state = LINK_RESETTING; 742 rc |= TIPC_LINK_DOWN_EVT; 743 break; 744 case LINK_RESET_EVT: 745 l->state = LINK_RESET; 746 break; 747 case LINK_ESTABLISH_EVT: 748 case LINK_SYNCH_BEGIN_EVT: 749 break; 750 case LINK_SYNCH_END_EVT: 751 l->state = LINK_ESTABLISHED; 752 break; 753 case LINK_FAILOVER_BEGIN_EVT: 754 case LINK_FAILOVER_END_EVT: 755 default: 756 goto illegal_evt; 757 } 758 break; 759 default: 760 pr_err("Unknown FSM state %x in %s\n", l->state, l->name); 761 } 762 trace_tipc_link_fsm(l->name, old_state, l->state, evt); 763 return rc; 764illegal_evt: 765 pr_err("Illegal FSM event %x in state %x on link %s\n", 766 evt, l->state, l->name); 767 trace_tipc_link_fsm(l->name, old_state, l->state, evt); 768 return rc; 769} 770 771/* link_profile_stats - update statistical profiling of traffic 772 */ 773static void link_profile_stats(struct tipc_link *l) 774{ 775 struct sk_buff *skb; 776 struct tipc_msg *msg; 777 int length; 778 779 /* Update counters used in statistical profiling of send traffic */ 780 l->stats.accu_queue_sz += skb_queue_len(&l->transmq); 781 l->stats.queue_sz_counts++; 782 783 skb = skb_peek(&l->transmq); 784 if (!skb) 785 return; 786 msg = buf_msg(skb); 787 length = msg_size(msg); 788 789 if (msg_user(msg) == MSG_FRAGMENTER) { 790 if (msg_type(msg) != FIRST_FRAGMENT) 791 return; 792 length = msg_size(msg_inner_hdr(msg)); 793 } 794 l->stats.msg_lengths_total += length; 795 l->stats.msg_length_counts++; 796 if (length <= 64) 797 l->stats.msg_length_profile[0]++; 798 else if (length <= 256) 799 l->stats.msg_length_profile[1]++; 800 else if (length <= 1024) 801 l->stats.msg_length_profile[2]++; 802 else if (length <= 4096) 803 l->stats.msg_length_profile[3]++; 804 else if (length <= 16384) 805 l->stats.msg_length_profile[4]++; 806 else if (length <= 32768) 807 l->stats.msg_length_profile[5]++; 808 else 809 l->stats.msg_length_profile[6]++; 810} 811 812/** 813 * tipc_link_too_silent - check if link is "too silent" 814 * @l: tipc link to be checked 815 * 816 * Return: true if the link 'silent_intv_cnt' is about to reach the 817 * 'abort_limit' value, otherwise false 818 */ 819bool tipc_link_too_silent(struct tipc_link *l) 820{ 821 return (l->silent_intv_cnt + 2 > l->abort_limit); 822} 823 824/* tipc_link_timeout - perform periodic task as instructed from node timeout 825 */ 826int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) 827{ 828 int mtyp = 0; 829 int rc = 0; 830 bool state = false; 831 bool probe = false; 832 bool setup = false; 833 u16 bc_snt = l->bc_sndlink->snd_nxt - 1; 834 u16 bc_acked = l->bc_rcvlink->acked; 835 struct tipc_mon_state *mstate = &l->mon_state; 836 837 trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " "); 838 trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " "); 839 switch (l->state) { 840 case LINK_ESTABLISHED: 841 case LINK_SYNCHING: 842 mtyp = STATE_MSG; 843 link_profile_stats(l); 844 tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); 845 if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) 846 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); 847 state = bc_acked != bc_snt; 848 state |= l->bc_rcvlink->rcv_unacked; 849 state |= l->rcv_unacked; 850 state |= !skb_queue_empty(&l->transmq); 851 probe = mstate->probing; 852 probe |= l->silent_intv_cnt; 853 if (probe || mstate->monitoring) 854 l->silent_intv_cnt++; 855 probe |= !skb_queue_empty(&l->deferdq); 856 if (l->snd_nxt == l->checkpoint) { 857 tipc_link_update_cwin(l, 0, 0); 858 probe = true; 859 } 860 l->checkpoint = l->snd_nxt; 861 break; 862 case LINK_RESET: 863 setup = l->rst_cnt++ <= 4; 864 setup |= !(l->rst_cnt % 16); 865 mtyp = RESET_MSG; 866 break; 867 case LINK_ESTABLISHING: 868 setup = true; 869 mtyp = ACTIVATE_MSG; 870 break; 871 case LINK_PEER_RESET: 872 case LINK_RESETTING: 873 case LINK_FAILINGOVER: 874 break; 875 default: 876 break; 877 } 878 879 if (state || probe || setup) 880 tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); 881 882 return rc; 883} 884 885/** 886 * link_schedule_user - schedule a message sender for wakeup after congestion 887 * @l: congested link 888 * @hdr: header of message that is being sent 889 * Create pseudo msg to send back to user when congestion abates 890 */ 891static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) 892{ 893 u32 dnode = tipc_own_addr(l->net); 894 u32 dport = msg_origport(hdr); 895 struct sk_buff *skb; 896 897 /* Create and schedule wakeup pseudo message */ 898 skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, 899 dnode, l->addr, dport, 0, 0); 900 if (!skb) 901 return -ENOBUFS; 902 msg_set_dest_droppable(buf_msg(skb), true); 903 TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); 904 skb_queue_tail(&l->wakeupq, skb); 905 l->stats.link_congs++; 906 trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!"); 907 return -ELINKCONG; 908} 909 910/** 911 * link_prepare_wakeup - prepare users for wakeup after congestion 912 * @l: congested link 913 * Wake up a number of waiting users, as permitted by available space 914 * in the send queue 915 */ 916static void link_prepare_wakeup(struct tipc_link *l) 917{ 918 struct sk_buff_head *wakeupq = &l->wakeupq; 919 struct sk_buff_head *inputq = l->inputq; 920 struct sk_buff *skb, *tmp; 921 struct sk_buff_head tmpq; 922 int avail[5] = {0,}; 923 int imp = 0; 924 925 __skb_queue_head_init(&tmpq); 926 927 for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) 928 avail[imp] = l->backlog[imp].limit - l->backlog[imp].len; 929 930 skb_queue_walk_safe(wakeupq, skb, tmp) { 931 imp = TIPC_SKB_CB(skb)->chain_imp; 932 if (avail[imp] <= 0) 933 continue; 934 avail[imp]--; 935 __skb_unlink(skb, wakeupq); 936 __skb_queue_tail(&tmpq, skb); 937 } 938 939 spin_lock_bh(&inputq->lock); 940 skb_queue_splice_tail(&tmpq, inputq); 941 spin_unlock_bh(&inputq->lock); 942 943} 944 945/** 946 * tipc_link_set_skb_retransmit_time - set the time at which retransmission of 947 * the given skb should be next attempted 948 * @skb: skb to set a future retransmission time for 949 * @l: link the skb will be transmitted on 950 */ 951static void tipc_link_set_skb_retransmit_time(struct sk_buff *skb, 952 struct tipc_link *l) 953{ 954 if (link_is_bc_sndlink(l)) 955 TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; 956 else 957 TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME; 958} 959 960void tipc_link_reset(struct tipc_link *l) 961{ 962 struct sk_buff_head list; 963 u32 imp; 964 965 __skb_queue_head_init(&list); 966 967 l->in_session = false; 968 /* Force re-synch of peer session number before establishing */ 969 l->peer_session--; 970 l->session++; 971 l->mtu = l->advertised_mtu; 972 973 spin_lock_bh(&l->wakeupq.lock); 974 skb_queue_splice_init(&l->wakeupq, &list); 975 spin_unlock_bh(&l->wakeupq.lock); 976 977 spin_lock_bh(&l->inputq->lock); 978 skb_queue_splice_init(&list, l->inputq); 979 spin_unlock_bh(&l->inputq->lock); 980 981 __skb_queue_purge(&l->transmq); 982 __skb_queue_purge(&l->deferdq); 983 __skb_queue_purge(&l->backlogq); 984 __skb_queue_purge(&l->failover_deferdq); 985 for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) { 986 l->backlog[imp].len = 0; 987 l->backlog[imp].target_bskb = NULL; 988 } 989 kfree_skb(l->reasm_buf); 990 kfree_skb(l->reasm_tnlmsg); 991 kfree_skb(l->failover_reasm_skb); 992 l->reasm_buf = NULL; 993 l->reasm_tnlmsg = NULL; 994 l->failover_reasm_skb = NULL; 995 l->rcv_unacked = 0; 996 l->snd_nxt = 1; 997 l->rcv_nxt = 1; 998 l->snd_nxt_state = 1; 999 l->rcv_nxt_state = 1; 1000 l->acked = 0; 1001 l->last_gap = 0; 1002 kfree(l->last_ga); 1003 l->last_ga = NULL; 1004 l->silent_intv_cnt = 0; 1005 l->rst_cnt = 0; 1006 l->bc_peer_is_up = false; 1007 memset(&l->mon_state, 0, sizeof(l->mon_state)); 1008 tipc_link_reset_stats(l); 1009} 1010 1011/** 1012 * tipc_link_xmit(): enqueue buffer list according to queue situation 1013 * @l: link to use 1014 * @list: chain of buffers containing message 1015 * @xmitq: returned list of packets to be sent by caller 1016 * 1017 * Consumes the buffer chain. 1018 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted 1019 * Return: 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS 1020 */ 1021int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, 1022 struct sk_buff_head *xmitq) 1023{ 1024 struct sk_buff_head *backlogq = &l->backlogq; 1025 struct sk_buff_head *transmq = &l->transmq; 1026 struct sk_buff *skb, *_skb; 1027 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; 1028 u16 ack = l->rcv_nxt - 1; 1029 u16 seqno = l->snd_nxt; 1030 int pkt_cnt = skb_queue_len(list); 1031 unsigned int mss = tipc_link_mss(l); 1032 unsigned int cwin = l->window; 1033 unsigned int mtu = l->mtu; 1034 struct tipc_msg *hdr; 1035 bool new_bundle; 1036 int rc = 0; 1037 int imp; 1038 1039 if (pkt_cnt <= 0) 1040 return 0; 1041 1042 hdr = buf_msg(skb_peek(list)); 1043 if (unlikely(msg_size(hdr) > mtu)) { 1044 pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n", 1045 skb_queue_len(list), msg_user(hdr), 1046 msg_type(hdr), msg_size(hdr), mtu); 1047 __skb_queue_purge(list); 1048 return -EMSGSIZE; 1049 } 1050 1051 imp = msg_importance(hdr); 1052 /* Allow oversubscription of one data msg per source at congestion */ 1053 if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { 1054 if (imp == TIPC_SYSTEM_IMPORTANCE) { 1055 pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); 1056 return -ENOBUFS; 1057 } 1058 rc = link_schedule_user(l, hdr); 1059 } 1060 1061 if (pkt_cnt > 1) { 1062 l->stats.sent_fragmented++; 1063 l->stats.sent_fragments += pkt_cnt; 1064 } 1065 1066 /* Prepare each packet for sending, and add to relevant queue: */ 1067 while ((skb = __skb_dequeue(list))) { 1068 if (likely(skb_queue_len(transmq) < cwin)) { 1069 hdr = buf_msg(skb); 1070 msg_set_seqno(hdr, seqno); 1071 msg_set_ack(hdr, ack); 1072 msg_set_bcast_ack(hdr, bc_ack); 1073 _skb = skb_clone(skb, GFP_ATOMIC); 1074 if (!_skb) { 1075 kfree_skb(skb); 1076 __skb_queue_purge(list); 1077 return -ENOBUFS; 1078 } 1079 __skb_queue_tail(transmq, skb); 1080 tipc_link_set_skb_retransmit_time(skb, l); 1081 __skb_queue_tail(xmitq, _skb); 1082 TIPC_SKB_CB(skb)->ackers = l->ackers; 1083 l->rcv_unacked = 0; 1084 l->stats.sent_pkts++; 1085 seqno++; 1086 continue; 1087 } 1088 if (tipc_msg_try_bundle(l->backlog[imp].target_bskb, &skb, 1089 mss, l->addr, &new_bundle)) { 1090 if (skb) { 1091 /* Keep a ref. to the skb for next try */ 1092 l->backlog[imp].target_bskb = skb; 1093 l->backlog[imp].len++; 1094 __skb_queue_tail(backlogq, skb); 1095 } else { 1096 if (new_bundle) { 1097 l->stats.sent_bundles++; 1098 l->stats.sent_bundled++; 1099 } 1100 l->stats.sent_bundled++; 1101 } 1102 continue; 1103 } 1104 l->backlog[imp].target_bskb = NULL; 1105 l->backlog[imp].len += (1 + skb_queue_len(list)); 1106 __skb_queue_tail(backlogq, skb); 1107 skb_queue_splice_tail_init(list, backlogq); 1108 } 1109 l->snd_nxt = seqno; 1110 return rc; 1111} 1112 1113static void tipc_link_update_cwin(struct tipc_link *l, int released, 1114 bool retransmitted) 1115{ 1116 int bklog_len = skb_queue_len(&l->backlogq); 1117 struct sk_buff_head *txq = &l->transmq; 1118 int txq_len = skb_queue_len(txq); 1119 u16 cwin = l->window; 1120 1121 /* Enter fast recovery */ 1122 if (unlikely(retransmitted)) { 1123 l->ssthresh = max_t(u16, l->window / 2, 300); 1124 l->window = min_t(u16, l->ssthresh, l->window); 1125 return; 1126 } 1127 /* Enter slow start */ 1128 if (unlikely(!released)) { 1129 l->ssthresh = max_t(u16, l->window / 2, 300); 1130 l->window = l->min_win; 1131 return; 1132 } 1133 /* Don't increase window if no pressure on the transmit queue */ 1134 if (txq_len + bklog_len < cwin) 1135 return; 1136 1137 /* Don't increase window if there are holes the transmit queue */ 1138 if (txq_len && l->snd_nxt - buf_seqno(skb_peek(txq)) != txq_len) 1139 return; 1140 1141 l->cong_acks += released; 1142 1143 /* Slow start */ 1144 if (cwin <= l->ssthresh) { 1145 l->window = min_t(u16, cwin + released, l->max_win); 1146 return; 1147 } 1148 /* Congestion avoidance */ 1149 if (l->cong_acks < cwin) 1150 return; 1151 l->window = min_t(u16, ++cwin, l->max_win); 1152 l->cong_acks = 0; 1153} 1154 1155static void tipc_link_advance_backlog(struct tipc_link *l, 1156 struct sk_buff_head *xmitq) 1157{ 1158 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; 1159 struct sk_buff_head *txq = &l->transmq; 1160 struct sk_buff *skb, *_skb; 1161 u16 ack = l->rcv_nxt - 1; 1162 u16 seqno = l->snd_nxt; 1163 struct tipc_msg *hdr; 1164 u16 cwin = l->window; 1165 u32 imp; 1166 1167 while (skb_queue_len(txq) < cwin) { 1168 skb = skb_peek(&l->backlogq); 1169 if (!skb) 1170 break; 1171 _skb = skb_clone(skb, GFP_ATOMIC); 1172 if (!_skb) 1173 break; 1174 __skb_dequeue(&l->backlogq); 1175 hdr = buf_msg(skb); 1176 imp = msg_importance(hdr); 1177 l->backlog[imp].len--; 1178 if (unlikely(skb == l->backlog[imp].target_bskb)) 1179 l->backlog[imp].target_bskb = NULL; 1180 __skb_queue_tail(&l->transmq, skb); 1181 tipc_link_set_skb_retransmit_time(skb, l); 1182 1183 __skb_queue_tail(xmitq, _skb); 1184 TIPC_SKB_CB(skb)->ackers = l->ackers; 1185 msg_set_seqno(hdr, seqno); 1186 msg_set_ack(hdr, ack); 1187 msg_set_bcast_ack(hdr, bc_ack); 1188 l->rcv_unacked = 0; 1189 l->stats.sent_pkts++; 1190 seqno++; 1191 } 1192 l->snd_nxt = seqno; 1193} 1194 1195/** 1196 * link_retransmit_failure() - Detect repeated retransmit failures 1197 * @l: tipc link sender 1198 * @r: tipc link receiver (= l in case of unicast) 1199 * @rc: returned code 1200 * 1201 * Return: true if the repeated retransmit failures happens, otherwise 1202 * false 1203 */ 1204static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r, 1205 int *rc) 1206{ 1207 struct sk_buff *skb = skb_peek(&l->transmq); 1208 struct tipc_msg *hdr; 1209 1210 if (!skb) 1211 return false; 1212 1213 if (!TIPC_SKB_CB(skb)->retr_cnt) 1214 return false; 1215 1216 if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp + 1217 msecs_to_jiffies(r->tolerance * 10))) 1218 return false; 1219 1220 hdr = buf_msg(skb); 1221 if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr))) 1222 return false; 1223 1224 pr_warn("Retransmission failure on link <%s>\n", l->name); 1225 link_print(l, "State of link "); 1226 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", 1227 msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); 1228 pr_info("sqno %u, prev: %x, dest: %x\n", 1229 msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr)); 1230 pr_info("retr_stamp %d, retr_cnt %d\n", 1231 jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp), 1232 TIPC_SKB_CB(skb)->retr_cnt); 1233 1234 trace_tipc_list_dump(&l->transmq, true, "retrans failure!"); 1235 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!"); 1236 trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!"); 1237 1238 if (link_is_bc_sndlink(l)) { 1239 r->state = LINK_RESET; 1240 *rc |= TIPC_LINK_DOWN_EVT; 1241 } else { 1242 *rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); 1243 } 1244 1245 return true; 1246} 1247 1248/* tipc_data_input - deliver data and name distr msgs to upper layer 1249 * 1250 * Consumes buffer if message is of right type 1251 * Node lock must be held 1252 */ 1253static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, 1254 struct sk_buff_head *inputq) 1255{ 1256 struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; 1257 struct tipc_msg *hdr = buf_msg(skb); 1258 1259 switch (msg_user(hdr)) { 1260 case TIPC_LOW_IMPORTANCE: 1261 case TIPC_MEDIUM_IMPORTANCE: 1262 case TIPC_HIGH_IMPORTANCE: 1263 case TIPC_CRITICAL_IMPORTANCE: 1264 if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { 1265 skb_queue_tail(mc_inputq, skb); 1266 return true; 1267 } 1268 fallthrough; 1269 case CONN_MANAGER: 1270 skb_queue_tail(inputq, skb); 1271 return true; 1272 case GROUP_PROTOCOL: 1273 skb_queue_tail(mc_inputq, skb); 1274 return true; 1275 case NAME_DISTRIBUTOR: 1276 l->bc_rcvlink->state = LINK_ESTABLISHED; 1277 skb_queue_tail(l->namedq, skb); 1278 return true; 1279 case MSG_BUNDLER: 1280 case TUNNEL_PROTOCOL: 1281 case MSG_FRAGMENTER: 1282 case BCAST_PROTOCOL: 1283 return false; 1284#ifdef CONFIG_TIPC_CRYPTO 1285 case MSG_CRYPTO: 1286 if (sysctl_tipc_key_exchange_enabled && 1287 TIPC_SKB_CB(skb)->decrypted) { 1288 tipc_crypto_msg_rcv(l->net, skb); 1289 return true; 1290 } 1291 fallthrough; 1292#endif 1293 default: 1294 pr_warn("Dropping received illegal msg type\n"); 1295 kfree_skb(skb); 1296 return true; 1297 } 1298} 1299 1300/* tipc_link_input - process packet that has passed link protocol check 1301 * 1302 * Consumes buffer 1303 */ 1304static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, 1305 struct sk_buff_head *inputq, 1306 struct sk_buff **reasm_skb) 1307{ 1308 struct tipc_msg *hdr = buf_msg(skb); 1309 struct sk_buff *iskb; 1310 struct sk_buff_head tmpq; 1311 int usr = msg_user(hdr); 1312 int pos = 0; 1313 1314 if (usr == MSG_BUNDLER) { 1315 skb_queue_head_init(&tmpq); 1316 l->stats.recv_bundles++; 1317 l->stats.recv_bundled += msg_msgcnt(hdr); 1318 while (tipc_msg_extract(skb, &iskb, &pos)) 1319 tipc_data_input(l, iskb, &tmpq); 1320 tipc_skb_queue_splice_tail(&tmpq, inputq); 1321 return 0; 1322 } else if (usr == MSG_FRAGMENTER) { 1323 l->stats.recv_fragments++; 1324 if (tipc_buf_append(reasm_skb, &skb)) { 1325 l->stats.recv_fragmented++; 1326 tipc_data_input(l, skb, inputq); 1327 } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { 1328 pr_warn_ratelimited("Unable to build fragment list\n"); 1329 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); 1330 } 1331 return 0; 1332 } else if (usr == BCAST_PROTOCOL) { 1333 tipc_bcast_lock(l->net); 1334 tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); 1335 tipc_bcast_unlock(l->net); 1336 } 1337 1338 kfree_skb(skb); 1339 return 0; 1340} 1341 1342/* tipc_link_tnl_rcv() - receive TUNNEL_PROTOCOL message, drop or process the 1343 * inner message along with the ones in the old link's 1344 * deferdq 1345 * @l: tunnel link 1346 * @skb: TUNNEL_PROTOCOL message 1347 * @inputq: queue to put messages ready for delivery 1348 */ 1349static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb, 1350 struct sk_buff_head *inputq) 1351{ 1352 struct sk_buff **reasm_skb = &l->failover_reasm_skb; 1353 struct sk_buff **reasm_tnlmsg = &l->reasm_tnlmsg; 1354 struct sk_buff_head *fdefq = &l->failover_deferdq; 1355 struct tipc_msg *hdr = buf_msg(skb); 1356 struct sk_buff *iskb; 1357 int ipos = 0; 1358 int rc = 0; 1359 u16 seqno; 1360 1361 if (msg_type(hdr) == SYNCH_MSG) { 1362 kfree_skb(skb); 1363 return 0; 1364 } 1365 1366 /* Not a fragment? */ 1367 if (likely(!msg_nof_fragms(hdr))) { 1368 if (unlikely(!tipc_msg_extract(skb, &iskb, &ipos))) { 1369 pr_warn_ratelimited("Unable to extract msg, defq: %d\n", 1370 skb_queue_len(fdefq)); 1371 return 0; 1372 } 1373 kfree_skb(skb); 1374 } else { 1375 /* Set fragment type for buf_append */ 1376 if (msg_fragm_no(hdr) == 1) 1377 msg_set_type(hdr, FIRST_FRAGMENT); 1378 else if (msg_fragm_no(hdr) < msg_nof_fragms(hdr)) 1379 msg_set_type(hdr, FRAGMENT); 1380 else 1381 msg_set_type(hdr, LAST_FRAGMENT); 1382 1383 if (!tipc_buf_append(reasm_tnlmsg, &skb)) { 1384 /* Successful but non-complete reassembly? */ 1385 if (*reasm_tnlmsg || link_is_bc_rcvlink(l)) 1386 return 0; 1387 pr_warn_ratelimited("Unable to reassemble tunnel msg\n"); 1388 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); 1389 } 1390 iskb = skb; 1391 } 1392 1393 do { 1394 seqno = buf_seqno(iskb); 1395 if (unlikely(less(seqno, l->drop_point))) { 1396 kfree_skb(iskb); 1397 continue; 1398 } 1399 if (unlikely(seqno != l->drop_point)) { 1400 __tipc_skb_queue_sorted(fdefq, seqno, iskb); 1401 continue; 1402 } 1403 1404 l->drop_point++; 1405 if (!tipc_data_input(l, iskb, inputq)) 1406 rc |= tipc_link_input(l, iskb, inputq, reasm_skb); 1407 if (unlikely(rc)) 1408 break; 1409 } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point))); 1410 1411 return rc; 1412} 1413 1414/** 1415 * tipc_get_gap_ack_blks - get Gap ACK blocks from PROTOCOL/STATE_MSG 1416 * @ga: returned pointer to the Gap ACK blocks if any 1417 * @l: the tipc link 1418 * @hdr: the PROTOCOL/STATE_MSG header 1419 * @uc: desired Gap ACK blocks type, i.e. unicast (= 1) or broadcast (= 0) 1420 * 1421 * Return: the total Gap ACK blocks size 1422 */ 1423u16 tipc_get_gap_ack_blks(struct tipc_gap_ack_blks **ga, struct tipc_link *l, 1424 struct tipc_msg *hdr, bool uc) 1425{ 1426 struct tipc_gap_ack_blks *p; 1427 u16 sz = 0; 1428 1429 /* Does peer support the Gap ACK blocks feature? */ 1430 if (l->peer_caps & TIPC_GAP_ACK_BLOCK) { 1431 p = (struct tipc_gap_ack_blks *)msg_data(hdr); 1432 sz = ntohs(p->len); 1433 /* Sanity check */ 1434 if (sz == struct_size(p, gacks, size_add(p->ugack_cnt, p->bgack_cnt))) { 1435 /* Good, check if the desired type exists */ 1436 if ((uc && p->ugack_cnt) || (!uc && p->bgack_cnt)) 1437 goto ok; 1438 /* Backward compatible: peer might not support bc, but uc? */ 1439 } else if (uc && sz == struct_size(p, gacks, p->ugack_cnt)) { 1440 if (p->ugack_cnt) { 1441 p->bgack_cnt = 0; 1442 goto ok; 1443 } 1444 } 1445 } 1446 /* Other cases: ignore! */ 1447 p = NULL; 1448 1449ok: 1450 *ga = p; 1451 return sz; 1452} 1453 1454static u8 __tipc_build_gap_ack_blks(struct tipc_gap_ack_blks *ga, 1455 struct tipc_link *l, u8 start_index) 1456{ 1457 struct tipc_gap_ack *gacks = &ga->gacks[start_index]; 1458 struct sk_buff *skb = skb_peek(&l->deferdq); 1459 u16 expect, seqno = 0; 1460 u8 n = 0; 1461 1462 if (!skb) 1463 return 0; 1464 1465 expect = buf_seqno(skb); 1466 skb_queue_walk(&l->deferdq, skb) { 1467 seqno = buf_seqno(skb); 1468 if (unlikely(more(seqno, expect))) { 1469 gacks[n].ack = htons(expect - 1); 1470 gacks[n].gap = htons(seqno - expect); 1471 if (++n >= MAX_GAP_ACK_BLKS / 2) { 1472 pr_info_ratelimited("Gacks on %s: %d, ql: %d!\n", 1473 l->name, n, 1474 skb_queue_len(&l->deferdq)); 1475 return n; 1476 } 1477 } else if (unlikely(less(seqno, expect))) { 1478 pr_warn("Unexpected skb in deferdq!\n"); 1479 continue; 1480 } 1481 expect = seqno + 1; 1482 } 1483 1484 /* last block */ 1485 gacks[n].ack = htons(seqno); 1486 gacks[n].gap = 0; 1487 n++; 1488 return n; 1489} 1490 1491/* tipc_build_gap_ack_blks - build Gap ACK blocks 1492 * @l: tipc unicast link 1493 * @hdr: the tipc message buffer to store the Gap ACK blocks after built 1494 * 1495 * The function builds Gap ACK blocks for both the unicast & broadcast receiver 1496 * links of a certain peer, the buffer after built has the network data format 1497 * as found at the struct tipc_gap_ack_blks definition. 1498 * 1499 * returns the actual allocated memory size 1500 */ 1501static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr) 1502{ 1503 struct tipc_link *bcl = l->bc_rcvlink; 1504 struct tipc_gap_ack_blks *ga; 1505 u16 len; 1506 1507 ga = (struct tipc_gap_ack_blks *)msg_data(hdr); 1508 1509 /* Start with broadcast link first */ 1510 tipc_bcast_lock(bcl->net); 1511 msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); 1512 msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); 1513 ga->bgack_cnt = __tipc_build_gap_ack_blks(ga, bcl, 0); 1514 tipc_bcast_unlock(bcl->net); 1515 1516 /* Now for unicast link, but an explicit NACK only (???) */ 1517 ga->ugack_cnt = (msg_seq_gap(hdr)) ? 1518 __tipc_build_gap_ack_blks(ga, l, ga->bgack_cnt) : 0; 1519 1520 /* Total len */ 1521 len = struct_size(ga, gacks, size_add(ga->bgack_cnt, ga->ugack_cnt)); 1522 ga->len = htons(len); 1523 return len; 1524} 1525 1526/* tipc_link_advance_transmq - advance TIPC link transmq queue by releasing 1527 * acked packets, also doing retransmissions if 1528 * gaps found 1529 * @l: tipc link with transmq queue to be advanced 1530 * @r: tipc link "receiver" i.e. in case of broadcast (= "l" if unicast) 1531 * @acked: seqno of last packet acked by peer without any gaps before 1532 * @gap: # of gap packets 1533 * @ga: buffer pointer to Gap ACK blocks from peer 1534 * @xmitq: queue for accumulating the retransmitted packets if any 1535 * @retransmitted: returned boolean value if a retransmission is really issued 1536 * @rc: returned code e.g. TIPC_LINK_DOWN_EVT if a repeated retransmit failures 1537 * happens (- unlikely case) 1538 * 1539 * Return: the number of packets released from the link transmq 1540 */ 1541static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r, 1542 u16 acked, u16 gap, 1543 struct tipc_gap_ack_blks *ga, 1544 struct sk_buff_head *xmitq, 1545 bool *retransmitted, int *rc) 1546{ 1547 struct tipc_gap_ack_blks *last_ga = r->last_ga, *this_ga = NULL; 1548 struct tipc_gap_ack *gacks = NULL; 1549 struct sk_buff *skb, *_skb, *tmp; 1550 struct tipc_msg *hdr; 1551 u32 qlen = skb_queue_len(&l->transmq); 1552 u16 nacked = acked, ngap = gap, gack_cnt = 0; 1553 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; 1554 u16 ack = l->rcv_nxt - 1; 1555 u16 seqno, n = 0; 1556 u16 end = r->acked, start = end, offset = r->last_gap; 1557 u16 si = (last_ga) ? last_ga->start_index : 0; 1558 bool is_uc = !link_is_bc_sndlink(l); 1559 bool bc_has_acked = false; 1560 1561 trace_tipc_link_retrans(r, acked + 1, acked + gap, &l->transmq); 1562 1563 /* Determine Gap ACK blocks if any for the particular link */ 1564 if (ga && is_uc) { 1565 /* Get the Gap ACKs, uc part */ 1566 gack_cnt = ga->ugack_cnt; 1567 gacks = &ga->gacks[ga->bgack_cnt]; 1568 } else if (ga) { 1569 /* Copy the Gap ACKs, bc part, for later renewal if needed */ 1570 this_ga = kmemdup(ga, struct_size(ga, gacks, ga->bgack_cnt), 1571 GFP_ATOMIC); 1572 if (likely(this_ga)) { 1573 this_ga->start_index = 0; 1574 /* Start with the bc Gap ACKs */ 1575 gack_cnt = this_ga->bgack_cnt; 1576 gacks = &this_ga->gacks[0]; 1577 } else { 1578 /* Hmm, we can get in trouble..., simply ignore it */ 1579 pr_warn_ratelimited("Ignoring bc Gap ACKs, no memory\n"); 1580 } 1581 } 1582 1583 /* Advance the link transmq */ 1584 skb_queue_walk_safe(&l->transmq, skb, tmp) { 1585 seqno = buf_seqno(skb); 1586 1587next_gap_ack: 1588 if (less_eq(seqno, nacked)) { 1589 if (is_uc) 1590 goto release; 1591 /* Skip packets peer has already acked */ 1592 if (!more(seqno, r->acked)) 1593 continue; 1594 /* Get the next of last Gap ACK blocks */ 1595 while (more(seqno, end)) { 1596 if (!last_ga || si >= last_ga->bgack_cnt) 1597 break; 1598 start = end + offset + 1; 1599 end = ntohs(last_ga->gacks[si].ack); 1600 offset = ntohs(last_ga->gacks[si].gap); 1601 si++; 1602 WARN_ONCE(more(start, end) || 1603 (!offset && 1604 si < last_ga->bgack_cnt) || 1605 si > MAX_GAP_ACK_BLKS, 1606 "Corrupted Gap ACK: %d %d %d %d %d\n", 1607 start, end, offset, si, 1608 last_ga->bgack_cnt); 1609 } 1610 /* Check against the last Gap ACK block */ 1611 if (tipc_in_range(seqno, start, end)) 1612 continue; 1613 /* Update/release the packet peer is acking */ 1614 bc_has_acked = true; 1615 if (--TIPC_SKB_CB(skb)->ackers) 1616 continue; 1617release: 1618 /* release skb */ 1619 __skb_unlink(skb, &l->transmq); 1620 kfree_skb(skb); 1621 } else if (less_eq(seqno, nacked + ngap)) { 1622 /* First gap: check if repeated retrans failures? */ 1623 if (unlikely(seqno == acked + 1 && 1624 link_retransmit_failure(l, r, rc))) { 1625 /* Ignore this bc Gap ACKs if any */ 1626 kfree(this_ga); 1627 this_ga = NULL; 1628 break; 1629 } 1630 /* retransmit skb if unrestricted*/ 1631 if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) 1632 continue; 1633 tipc_link_set_skb_retransmit_time(skb, l); 1634 _skb = pskb_copy(skb, GFP_ATOMIC); 1635 if (!_skb) 1636 continue; 1637 hdr = buf_msg(_skb); 1638 msg_set_ack(hdr, ack); 1639 msg_set_bcast_ack(hdr, bc_ack); 1640 _skb->priority = TC_PRIO_CONTROL; 1641 __skb_queue_tail(xmitq, _skb); 1642 l->stats.retransmitted++; 1643 if (!is_uc) 1644 r->stats.retransmitted++; 1645 *retransmitted = true; 1646 /* Increase actual retrans counter & mark first time */ 1647 if (!TIPC_SKB_CB(skb)->retr_cnt++) 1648 TIPC_SKB_CB(skb)->retr_stamp = jiffies; 1649 } else { 1650 /* retry with Gap ACK blocks if any */ 1651 if (n >= gack_cnt) 1652 break; 1653 nacked = ntohs(gacks[n].ack); 1654 ngap = ntohs(gacks[n].gap); 1655 n++; 1656 goto next_gap_ack; 1657 } 1658 } 1659 1660 /* Renew last Gap ACK blocks for bc if needed */ 1661 if (bc_has_acked) { 1662 if (this_ga) { 1663 kfree(last_ga); 1664 r->last_ga = this_ga; 1665 r->last_gap = gap; 1666 } else if (last_ga) { 1667 if (less(acked, start)) { 1668 si--; 1669 offset = start - acked - 1; 1670 } else if (less(acked, end)) { 1671 acked = end; 1672 } 1673 if (si < last_ga->bgack_cnt) { 1674 last_ga->start_index = si; 1675 r->last_gap = offset; 1676 } else { 1677 kfree(last_ga); 1678 r->last_ga = NULL; 1679 r->last_gap = 0; 1680 } 1681 } else { 1682 r->last_gap = 0; 1683 } 1684 r->acked = acked; 1685 } else { 1686 kfree(this_ga); 1687 } 1688 1689 return qlen - skb_queue_len(&l->transmq); 1690} 1691 1692/* tipc_link_build_state_msg: prepare link state message for transmission 1693 * 1694 * Note that sending of broadcast ack is coordinated among nodes, to reduce 1695 * risk of ack storms towards the sender 1696 */ 1697int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) 1698{ 1699 if (!l) 1700 return 0; 1701 1702 /* Broadcast ACK must be sent via a unicast link => defer to caller */ 1703 if (link_is_bc_rcvlink(l)) { 1704 if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) 1705 return 0; 1706 l->rcv_unacked = 0; 1707 1708 /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ 1709 l->snd_nxt = l->rcv_nxt; 1710 return TIPC_LINK_SND_STATE; 1711 } 1712 /* Unicast ACK */ 1713 l->rcv_unacked = 0; 1714 l->stats.sent_acks++; 1715 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); 1716 return 0; 1717} 1718 1719/* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message 1720 */ 1721void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) 1722{ 1723 int mtyp = RESET_MSG; 1724 struct sk_buff *skb; 1725 1726 if (l->state == LINK_ESTABLISHING) 1727 mtyp = ACTIVATE_MSG; 1728 1729 tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); 1730 1731 /* Inform peer that this endpoint is going down if applicable */ 1732 skb = skb_peek_tail(xmitq); 1733 if (skb && (l->state == LINK_RESET)) 1734 msg_set_peer_stopping(buf_msg(skb), 1); 1735} 1736 1737/* tipc_link_build_nack_msg: prepare link nack message for transmission 1738 * Note that sending of broadcast NACK is coordinated among nodes, to 1739 * reduce the risk of NACK storms towards the sender 1740 */ 1741static int tipc_link_build_nack_msg(struct tipc_link *l, 1742 struct sk_buff_head *xmitq) 1743{ 1744 u32 def_cnt = ++l->stats.deferred_recv; 1745 struct sk_buff_head *dfq = &l->deferdq; 1746 u32 defq_len = skb_queue_len(dfq); 1747 int match1, match2; 1748 1749 if (link_is_bc_rcvlink(l)) { 1750 match1 = def_cnt & 0xf; 1751 match2 = tipc_own_addr(l->net) & 0xf; 1752 if (match1 == match2) 1753 return TIPC_LINK_SND_STATE; 1754 return 0; 1755 } 1756 1757 if (defq_len >= 3 && !((defq_len - 3) % 16)) { 1758 u16 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; 1759 1760 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 1761 rcvgap, 0, 0, xmitq); 1762 } 1763 return 0; 1764} 1765 1766/* tipc_link_rcv - process TIPC packets/messages arriving from off-node 1767 * @l: the link that should handle the message 1768 * @skb: TIPC packet 1769 * @xmitq: queue to place packets to be sent after this call 1770 */ 1771int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, 1772 struct sk_buff_head *xmitq) 1773{ 1774 struct sk_buff_head *defq = &l->deferdq; 1775 struct tipc_msg *hdr = buf_msg(skb); 1776 u16 seqno, rcv_nxt, win_lim; 1777 int released = 0; 1778 int rc = 0; 1779 1780 /* Verify and update link state */ 1781 if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) 1782 return tipc_link_proto_rcv(l, skb, xmitq); 1783 1784 /* Don't send probe at next timeout expiration */ 1785 l->silent_intv_cnt = 0; 1786 1787 do { 1788 hdr = buf_msg(skb); 1789 seqno = msg_seqno(hdr); 1790 rcv_nxt = l->rcv_nxt; 1791 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; 1792 1793 if (unlikely(!link_is_up(l))) { 1794 if (l->state == LINK_ESTABLISHING) 1795 rc = TIPC_LINK_UP_EVT; 1796 kfree_skb(skb); 1797 break; 1798 } 1799 1800 /* Drop if outside receive window */ 1801 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { 1802 l->stats.duplicates++; 1803 kfree_skb(skb); 1804 break; 1805 } 1806 released += tipc_link_advance_transmq(l, l, msg_ack(hdr), 0, 1807 NULL, NULL, NULL, NULL); 1808 1809 /* Defer delivery if sequence gap */ 1810 if (unlikely(seqno != rcv_nxt)) { 1811 if (!__tipc_skb_queue_sorted(defq, seqno, skb)) 1812 l->stats.duplicates++; 1813 rc |= tipc_link_build_nack_msg(l, xmitq); 1814 break; 1815 } 1816 1817 /* Deliver packet */ 1818 l->rcv_nxt++; 1819 l->stats.recv_pkts++; 1820 1821 if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL)) 1822 rc |= tipc_link_tnl_rcv(l, skb, l->inputq); 1823 else if (!tipc_data_input(l, skb, l->inputq)) 1824 rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf); 1825 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) 1826 rc |= tipc_link_build_state_msg(l, xmitq); 1827 if (unlikely(rc & ~TIPC_LINK_SND_STATE)) 1828 break; 1829 } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt))); 1830 1831 /* Forward queues and wake up waiting users */ 1832 if (released) { 1833 tipc_link_update_cwin(l, released, 0); 1834 tipc_link_advance_backlog(l, xmitq); 1835 if (unlikely(!skb_queue_empty(&l->wakeupq))) 1836 link_prepare_wakeup(l); 1837 } 1838 return rc; 1839} 1840 1841static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, 1842 bool probe_reply, u16 rcvgap, 1843 int tolerance, int priority, 1844 struct sk_buff_head *xmitq) 1845{ 1846 struct tipc_mon_state *mstate = &l->mon_state; 1847 struct sk_buff_head *dfq = &l->deferdq; 1848 struct tipc_link *bcl = l->bc_rcvlink; 1849 struct tipc_msg *hdr; 1850 struct sk_buff *skb; 1851 bool node_up = link_is_up(bcl); 1852 u16 glen = 0, bc_rcvgap = 0; 1853 int dlen = 0; 1854 void *data; 1855 1856 /* Don't send protocol message during reset or link failover */ 1857 if (tipc_link_is_blocked(l)) 1858 return; 1859 1860 if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) 1861 return; 1862 1863 if ((probe || probe_reply) && !skb_queue_empty(dfq)) 1864 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; 1865 1866 skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, 1867 tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ, 1868 l->addr, tipc_own_addr(l->net), 0, 0, 0); 1869 if (!skb) 1870 return; 1871 1872 hdr = buf_msg(skb); 1873 data = msg_data(hdr); 1874 msg_set_session(hdr, l->session); 1875 msg_set_bearer_id(hdr, l->bearer_id); 1876 msg_set_net_plane(hdr, l->net_plane); 1877 msg_set_next_sent(hdr, l->snd_nxt); 1878 msg_set_ack(hdr, l->rcv_nxt - 1); 1879 msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); 1880 msg_set_bc_ack_invalid(hdr, !node_up); 1881 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); 1882 msg_set_link_tolerance(hdr, tolerance); 1883 msg_set_linkprio(hdr, priority); 1884 msg_set_redundant_link(hdr, node_up); 1885 msg_set_seq_gap(hdr, 0); 1886 msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); 1887 1888 if (mtyp == STATE_MSG) { 1889 if (l->peer_caps & TIPC_LINK_PROTO_SEQNO) 1890 msg_set_seqno(hdr, l->snd_nxt_state++); 1891 msg_set_seq_gap(hdr, rcvgap); 1892 bc_rcvgap = link_bc_rcv_gap(bcl); 1893 msg_set_bc_gap(hdr, bc_rcvgap); 1894 msg_set_probe(hdr, probe); 1895 msg_set_is_keepalive(hdr, probe || probe_reply); 1896 if (l->peer_caps & TIPC_GAP_ACK_BLOCK) 1897 glen = tipc_build_gap_ack_blks(l, hdr); 1898 tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id); 1899 msg_set_size(hdr, INT_H_SIZE + glen + dlen); 1900 skb_trim(skb, INT_H_SIZE + glen + dlen); 1901 l->stats.sent_states++; 1902 l->rcv_unacked = 0; 1903 } else { 1904 /* RESET_MSG or ACTIVATE_MSG */ 1905 if (mtyp == ACTIVATE_MSG) { 1906 msg_set_dest_session_valid(hdr, 1); 1907 msg_set_dest_session(hdr, l->peer_session); 1908 } 1909 msg_set_max_pkt(hdr, l->advertised_mtu); 1910 strcpy(data, l->if_name); 1911 msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); 1912 skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); 1913 } 1914 if (probe) 1915 l->stats.sent_probes++; 1916 if (rcvgap) 1917 l->stats.sent_nacks++; 1918 if (bc_rcvgap) 1919 bcl->stats.sent_nacks++; 1920 skb->priority = TC_PRIO_CONTROL; 1921 __skb_queue_tail(xmitq, skb); 1922 trace_tipc_proto_build(skb, false, l->name); 1923} 1924 1925void tipc_link_create_dummy_tnl_msg(struct tipc_link *l, 1926 struct sk_buff_head *xmitq) 1927{ 1928 u32 onode = tipc_own_addr(l->net); 1929 struct tipc_msg *hdr, *ihdr; 1930 struct sk_buff_head tnlq; 1931 struct sk_buff *skb; 1932 u32 dnode = l->addr; 1933 1934 __skb_queue_head_init(&tnlq); 1935 skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG, 1936 INT_H_SIZE, BASIC_H_SIZE, 1937 dnode, onode, 0, 0, 0); 1938 if (!skb) { 1939 pr_warn("%sunable to create tunnel packet\n", link_co_err); 1940 return; 1941 } 1942 1943 hdr = buf_msg(skb); 1944 msg_set_msgcnt(hdr, 1); 1945 msg_set_bearer_id(hdr, l->peer_bearer_id); 1946 1947 ihdr = (struct tipc_msg *)msg_data(hdr); 1948 tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, 1949 BASIC_H_SIZE, dnode); 1950 msg_set_errcode(ihdr, TIPC_ERR_NO_PORT); 1951 __skb_queue_tail(&tnlq, skb); 1952 tipc_link_xmit(l, &tnlq, xmitq); 1953} 1954 1955/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets 1956 * with contents of the link's transmit and backlog queues. 1957 */ 1958void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, 1959 int mtyp, struct sk_buff_head *xmitq) 1960{ 1961 struct sk_buff_head *fdefq = &tnl->failover_deferdq; 1962 struct sk_buff *skb, *tnlskb; 1963 struct tipc_msg *hdr, tnlhdr; 1964 struct sk_buff_head *queue = &l->transmq; 1965 struct sk_buff_head tmpxq, tnlq, frags; 1966 u16 pktlen, pktcnt, seqno = l->snd_nxt; 1967 bool pktcnt_need_update = false; 1968 u16 syncpt; 1969 int rc; 1970 1971 if (!tnl) 1972 return; 1973 1974 __skb_queue_head_init(&tnlq); 1975 /* Link Synching: 1976 * From now on, send only one single ("dummy") SYNCH message 1977 * to peer. The SYNCH message does not contain any data, just 1978 * a header conveying the synch point to the peer. 1979 */ 1980 if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { 1981 tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG, 1982 INT_H_SIZE, 0, l->addr, 1983 tipc_own_addr(l->net), 1984 0, 0, 0); 1985 if (!tnlskb) { 1986 pr_warn("%sunable to create dummy SYNCH_MSG\n", 1987 link_co_err); 1988 return; 1989 } 1990 1991 hdr = buf_msg(tnlskb); 1992 syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1; 1993 msg_set_syncpt(hdr, syncpt); 1994 msg_set_bearer_id(hdr, l->peer_bearer_id); 1995 __skb_queue_tail(&tnlq, tnlskb); 1996 tipc_link_xmit(tnl, &tnlq, xmitq); 1997 return; 1998 } 1999 2000 __skb_queue_head_init(&tmpxq); 2001 __skb_queue_head_init(&frags); 2002 /* At least one packet required for safe algorithm => add dummy */ 2003 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, 2004 BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), 2005 0, 0, TIPC_ERR_NO_PORT); 2006 if (!skb) { 2007 pr_warn("%sunable to create tunnel packet\n", link_co_err); 2008 return; 2009 } 2010 __skb_queue_tail(&tnlq, skb); 2011 tipc_link_xmit(l, &tnlq, &tmpxq); 2012 __skb_queue_purge(&tmpxq); 2013 2014 /* Initialize reusable tunnel packet header */ 2015 tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, 2016 mtyp, INT_H_SIZE, l->addr); 2017 if (mtyp == SYNCH_MSG) 2018 pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq)); 2019 else 2020 pktcnt = skb_queue_len(&l->transmq); 2021 pktcnt += skb_queue_len(&l->backlogq); 2022 msg_set_msgcnt(&tnlhdr, pktcnt); 2023 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); 2024tnl: 2025 /* Wrap each packet into a tunnel packet */ 2026 skb_queue_walk(queue, skb) { 2027 hdr = buf_msg(skb); 2028 if (queue == &l->backlogq) 2029 msg_set_seqno(hdr, seqno++); 2030 pktlen = msg_size(hdr); 2031 2032 /* Tunnel link MTU is not large enough? This could be 2033 * due to: 2034 * 1) Link MTU has just changed or set differently; 2035 * 2) Or FAILOVER on the top of a SYNCH message 2036 * 2037 * The 2nd case should not happen if peer supports 2038 * TIPC_TUNNEL_ENHANCED 2039 */ 2040 if (pktlen > tnl->mtu - INT_H_SIZE) { 2041 if (mtyp == FAILOVER_MSG && 2042 (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { 2043 rc = tipc_msg_fragment(skb, &tnlhdr, tnl->mtu, 2044 &frags); 2045 if (rc) { 2046 pr_warn("%sunable to frag msg: rc %d\n", 2047 link_co_err, rc); 2048 return; 2049 } 2050 pktcnt += skb_queue_len(&frags) - 1; 2051 pktcnt_need_update = true; 2052 skb_queue_splice_tail_init(&frags, &tnlq); 2053 continue; 2054 } 2055 /* Unluckily, peer doesn't have TIPC_TUNNEL_ENHANCED 2056 * => Just warn it and return! 2057 */ 2058 pr_warn_ratelimited("%stoo large msg <%d, %d>: %d!\n", 2059 link_co_err, msg_user(hdr), 2060 msg_type(hdr), msg_size(hdr)); 2061 return; 2062 } 2063 2064 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); 2065 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC); 2066 if (!tnlskb) { 2067 pr_warn("%sunable to send packet\n", link_co_err); 2068 return; 2069 } 2070 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); 2071 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); 2072 __skb_queue_tail(&tnlq, tnlskb); 2073 } 2074 if (queue != &l->backlogq) { 2075 queue = &l->backlogq; 2076 goto tnl; 2077 } 2078 2079 if (pktcnt_need_update) 2080 skb_queue_walk(&tnlq, skb) { 2081 hdr = buf_msg(skb); 2082 msg_set_msgcnt(hdr, pktcnt); 2083 } 2084 2085 tipc_link_xmit(tnl, &tnlq, xmitq); 2086 2087 if (mtyp == FAILOVER_MSG) { 2088 tnl->drop_point = l->rcv_nxt; 2089 tnl->failover_reasm_skb = l->reasm_buf; 2090 l->reasm_buf = NULL; 2091 2092 /* Failover the link's deferdq */ 2093 if (unlikely(!skb_queue_empty(fdefq))) { 2094 pr_warn("Link failover deferdq not empty: %d!\n", 2095 skb_queue_len(fdefq)); 2096 __skb_queue_purge(fdefq); 2097 } 2098 skb_queue_splice_init(&l->deferdq, fdefq); 2099 } 2100} 2101 2102/** 2103 * tipc_link_failover_prepare() - prepare tnl for link failover 2104 * 2105 * This is a special version of the precursor - tipc_link_tnl_prepare(), 2106 * see the tipc_node_link_failover() for details 2107 * 2108 * @l: failover link 2109 * @tnl: tunnel link 2110 * @xmitq: queue for messages to be xmited 2111 */ 2112void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl, 2113 struct sk_buff_head *xmitq) 2114{ 2115 struct sk_buff_head *fdefq = &tnl->failover_deferdq; 2116 2117 tipc_link_create_dummy_tnl_msg(tnl, xmitq); 2118 2119 /* This failover link endpoint was never established before, 2120 * so it has not received anything from peer. 2121 * Otherwise, it must be a normal failover situation or the 2122 * node has entered SELF_DOWN_PEER_LEAVING and both peer nodes 2123 * would have to start over from scratch instead. 2124 */ 2125 tnl->drop_point = 1; 2126 tnl->failover_reasm_skb = NULL; 2127 2128 /* Initiate the link's failover deferdq */ 2129 if (unlikely(!skb_queue_empty(fdefq))) { 2130 pr_warn("Link failover deferdq not empty: %d!\n", 2131 skb_queue_len(fdefq)); 2132 __skb_queue_purge(fdefq); 2133 } 2134} 2135 2136/* tipc_link_validate_msg(): validate message against current link state 2137 * Returns true if message should be accepted, otherwise false 2138 */ 2139bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr) 2140{ 2141 u16 curr_session = l->peer_session; 2142 u16 session = msg_session(hdr); 2143 int mtyp = msg_type(hdr); 2144 2145 if (msg_user(hdr) != LINK_PROTOCOL) 2146 return true; 2147 2148 switch (mtyp) { 2149 case RESET_MSG: 2150 if (!l->in_session) 2151 return true; 2152 /* Accept only RESET with new session number */ 2153 return more(session, curr_session); 2154 case ACTIVATE_MSG: 2155 if (!l->in_session) 2156 return true; 2157 /* Accept only ACTIVATE with new or current session number */ 2158 return !less(session, curr_session); 2159 case STATE_MSG: 2160 /* Accept only STATE with current session number */ 2161 if (!l->in_session) 2162 return false; 2163 if (session != curr_session) 2164 return false; 2165 /* Extra sanity check */ 2166 if (!link_is_up(l) && msg_ack(hdr)) 2167 return false; 2168 if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO)) 2169 return true; 2170 /* Accept only STATE with new sequence number */ 2171 return !less(msg_seqno(hdr), l->rcv_nxt_state); 2172 default: 2173 return false; 2174 } 2175} 2176 2177/* tipc_link_proto_rcv(): receive link level protocol message : 2178 * Note that network plane id propagates through the network, and may 2179 * change at any time. The node with lowest numerical id determines 2180 * network plane 2181 */ 2182static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, 2183 struct sk_buff_head *xmitq) 2184{ 2185 struct tipc_msg *hdr = buf_msg(skb); 2186 struct tipc_gap_ack_blks *ga = NULL; 2187 bool reply = msg_probe(hdr), retransmitted = false; 2188 u32 dlen = msg_data_sz(hdr), glen = 0, msg_max; 2189 u16 peers_snd_nxt = msg_next_sent(hdr); 2190 u16 peers_tol = msg_link_tolerance(hdr); 2191 u16 peers_prio = msg_linkprio(hdr); 2192 u16 gap = msg_seq_gap(hdr); 2193 u16 ack = msg_ack(hdr); 2194 u16 rcv_nxt = l->rcv_nxt; 2195 u16 rcvgap = 0; 2196 int mtyp = msg_type(hdr); 2197 int rc = 0, released; 2198 char *if_name; 2199 void *data; 2200 2201 trace_tipc_proto_rcv(skb, false, l->name); 2202 2203 if (dlen > U16_MAX) 2204 goto exit; 2205 2206 if (tipc_link_is_blocked(l) || !xmitq) 2207 goto exit; 2208 2209 if (tipc_own_addr(l->net) > msg_prevnode(hdr)) 2210 l->net_plane = msg_net_plane(hdr); 2211 2212 if (skb_linearize(skb)) 2213 goto exit; 2214 2215 hdr = buf_msg(skb); 2216 data = msg_data(hdr); 2217 2218 if (!tipc_link_validate_msg(l, hdr)) { 2219 trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!"); 2220 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!"); 2221 goto exit; 2222 } 2223 2224 switch (mtyp) { 2225 case RESET_MSG: 2226 case ACTIVATE_MSG: 2227 msg_max = msg_max_pkt(hdr); 2228 if (msg_max < tipc_bearer_min_mtu(l->net, l->bearer_id)) 2229 break; 2230 /* Complete own link name with peer's interface name */ 2231 if_name = strrchr(l->name, ':') + 1; 2232 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) 2233 break; 2234 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) 2235 break; 2236 strncpy(if_name, data, TIPC_MAX_IF_NAME); 2237 2238 /* Update own tolerance if peer indicates a non-zero value */ 2239 if (tipc_in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { 2240 l->tolerance = peers_tol; 2241 l->bc_rcvlink->tolerance = peers_tol; 2242 } 2243 /* Update own priority if peer's priority is higher */ 2244 if (tipc_in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) 2245 l->priority = peers_prio; 2246 2247 /* If peer is going down we want full re-establish cycle */ 2248 if (msg_peer_stopping(hdr)) { 2249 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); 2250 break; 2251 } 2252 2253 /* If this endpoint was re-created while peer was ESTABLISHING 2254 * it doesn't know current session number. Force re-synch. 2255 */ 2256 if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) && 2257 l->session != msg_dest_session(hdr)) { 2258 if (less(l->session, msg_dest_session(hdr))) 2259 l->session = msg_dest_session(hdr) + 1; 2260 break; 2261 } 2262 2263 /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ 2264 if (mtyp == RESET_MSG || !link_is_up(l)) 2265 rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); 2266 2267 /* ACTIVATE_MSG takes up link if it was already locally reset */ 2268 if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING) 2269 rc = TIPC_LINK_UP_EVT; 2270 2271 l->peer_session = msg_session(hdr); 2272 l->in_session = true; 2273 l->peer_bearer_id = msg_bearer_id(hdr); 2274 if (l->mtu > msg_max) 2275 l->mtu = msg_max; 2276 break; 2277 2278 case STATE_MSG: 2279 /* Validate Gap ACK blocks, drop if invalid */ 2280 glen = tipc_get_gap_ack_blks(&ga, l, hdr, true); 2281 if (glen > dlen) 2282 break; 2283 2284 l->rcv_nxt_state = msg_seqno(hdr) + 1; 2285 2286 /* Update own tolerance if peer indicates a non-zero value */ 2287 if (tipc_in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { 2288 l->tolerance = peers_tol; 2289 l->bc_rcvlink->tolerance = peers_tol; 2290 } 2291 /* Update own prio if peer indicates a different value */ 2292 if ((peers_prio != l->priority) && 2293 tipc_in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { 2294 l->priority = peers_prio; 2295 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); 2296 } 2297 2298 l->silent_intv_cnt = 0; 2299 l->stats.recv_states++; 2300 if (msg_probe(hdr)) 2301 l->stats.recv_probes++; 2302 2303 if (!link_is_up(l)) { 2304 if (l->state == LINK_ESTABLISHING) 2305 rc = TIPC_LINK_UP_EVT; 2306 break; 2307 } 2308 2309 tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr, 2310 &l->mon_state, l->bearer_id); 2311 2312 /* Send NACK if peer has sent pkts we haven't received yet */ 2313 if ((reply || msg_is_keepalive(hdr)) && 2314 more(peers_snd_nxt, rcv_nxt) && 2315 !tipc_link_is_synching(l) && 2316 skb_queue_empty(&l->deferdq)) 2317 rcvgap = peers_snd_nxt - l->rcv_nxt; 2318 if (rcvgap || reply) 2319 tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, 2320 rcvgap, 0, 0, xmitq); 2321 2322 released = tipc_link_advance_transmq(l, l, ack, gap, ga, xmitq, 2323 &retransmitted, &rc); 2324 if (gap) 2325 l->stats.recv_nacks++; 2326 if (released || retransmitted) 2327 tipc_link_update_cwin(l, released, retransmitted); 2328 if (released) 2329 tipc_link_advance_backlog(l, xmitq); 2330 if (unlikely(!skb_queue_empty(&l->wakeupq))) 2331 link_prepare_wakeup(l); 2332 } 2333exit: 2334 kfree_skb(skb); 2335 return rc; 2336} 2337 2338/* tipc_link_build_bc_proto_msg() - create broadcast protocol message 2339 */ 2340static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, 2341 u16 peers_snd_nxt, 2342 struct sk_buff_head *xmitq) 2343{ 2344 struct sk_buff *skb; 2345 struct tipc_msg *hdr; 2346 struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); 2347 u16 ack = l->rcv_nxt - 1; 2348 u16 gap_to = peers_snd_nxt - 1; 2349 2350 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, 2351 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); 2352 if (!skb) 2353 return false; 2354 hdr = buf_msg(skb); 2355 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); 2356 msg_set_bcast_ack(hdr, ack); 2357 msg_set_bcgap_after(hdr, ack); 2358 if (dfrd_skb) 2359 gap_to = buf_seqno(dfrd_skb) - 1; 2360 msg_set_bcgap_to(hdr, gap_to); 2361 msg_set_non_seq(hdr, bcast); 2362 __skb_queue_tail(xmitq, skb); 2363 return true; 2364} 2365 2366/* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. 2367 * 2368 * Give a newly added peer node the sequence number where it should 2369 * start receiving and acking broadcast packets. 2370 */ 2371static void tipc_link_build_bc_init_msg(struct tipc_link *l, 2372 struct sk_buff_head *xmitq) 2373{ 2374 struct sk_buff_head list; 2375 2376 __skb_queue_head_init(&list); 2377 if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) 2378 return; 2379 msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); 2380 tipc_link_xmit(l, &list, xmitq); 2381} 2382 2383/* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer 2384 */ 2385void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) 2386{ 2387 int mtyp = msg_type(hdr); 2388 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); 2389 2390 if (link_is_up(l)) 2391 return; 2392 2393 if (msg_user(hdr) == BCAST_PROTOCOL) { 2394 l->rcv_nxt = peers_snd_nxt; 2395 l->state = LINK_ESTABLISHED; 2396 return; 2397 } 2398 2399 if (l->peer_caps & TIPC_BCAST_SYNCH) 2400 return; 2401 2402 if (msg_peer_node_is_up(hdr)) 2403 return; 2404 2405 /* Compatibility: accept older, less safe initial synch data */ 2406 if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) 2407 l->rcv_nxt = peers_snd_nxt; 2408} 2409 2410/* tipc_link_bc_sync_rcv - update rcv link according to peer's send state 2411 */ 2412int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, 2413 struct sk_buff_head *xmitq) 2414{ 2415 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); 2416 int rc = 0; 2417 2418 if (!link_is_up(l)) 2419 return rc; 2420 2421 if (!msg_peer_node_is_up(hdr)) 2422 return rc; 2423 2424 /* Open when peer acknowledges our bcast init msg (pkt #1) */ 2425 if (msg_ack(hdr)) 2426 l->bc_peer_is_up = true; 2427 2428 if (!l->bc_peer_is_up) 2429 return rc; 2430 2431 /* Ignore if peers_snd_nxt goes beyond receive window */ 2432 if (more(peers_snd_nxt, l->rcv_nxt + l->window)) 2433 return rc; 2434 2435 l->snd_nxt = peers_snd_nxt; 2436 if (link_bc_rcv_gap(l)) 2437 rc |= TIPC_LINK_SND_STATE; 2438 2439 /* Return now if sender supports nack via STATE messages */ 2440 if (l->peer_caps & TIPC_BCAST_STATE_NACK) 2441 return rc; 2442 2443 /* Otherwise, be backwards compatible */ 2444 2445 if (!more(peers_snd_nxt, l->rcv_nxt)) { 2446 l->nack_state = BC_NACK_SND_CONDITIONAL; 2447 return 0; 2448 } 2449 2450 /* Don't NACK if one was recently sent or peeked */ 2451 if (l->nack_state == BC_NACK_SND_SUPPRESS) { 2452 l->nack_state = BC_NACK_SND_UNCONDITIONAL; 2453 return 0; 2454 } 2455 2456 /* Conditionally delay NACK sending until next synch rcv */ 2457 if (l->nack_state == BC_NACK_SND_CONDITIONAL) { 2458 l->nack_state = BC_NACK_SND_UNCONDITIONAL; 2459 if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) 2460 return 0; 2461 } 2462 2463 /* Send NACK now but suppress next one */ 2464 tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); 2465 l->nack_state = BC_NACK_SND_SUPPRESS; 2466 return 0; 2467} 2468 2469int tipc_link_bc_ack_rcv(struct tipc_link *r, u16 acked, u16 gap, 2470 struct tipc_gap_ack_blks *ga, 2471 struct sk_buff_head *xmitq, 2472 struct sk_buff_head *retrq) 2473{ 2474 struct tipc_link *l = r->bc_sndlink; 2475 bool unused = false; 2476 int rc = 0; 2477 2478 if (!link_is_up(r) || !r->bc_peer_is_up) 2479 return 0; 2480 2481 if (gap) { 2482 l->stats.recv_nacks++; 2483 r->stats.recv_nacks++; 2484 } 2485 2486 if (less(acked, r->acked) || (acked == r->acked && !gap && !ga)) 2487 return 0; 2488 2489 trace_tipc_link_bc_ack(r, acked, gap, &l->transmq); 2490 tipc_link_advance_transmq(l, r, acked, gap, ga, retrq, &unused, &rc); 2491 2492 tipc_link_advance_backlog(l, xmitq); 2493 if (unlikely(!skb_queue_empty(&l->wakeupq))) 2494 link_prepare_wakeup(l); 2495 2496 return rc; 2497} 2498 2499/* tipc_link_bc_nack_rcv(): receive broadcast nack message 2500 * This function is here for backwards compatibility, since 2501 * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. 2502 */ 2503int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, 2504 struct sk_buff_head *xmitq) 2505{ 2506 struct tipc_msg *hdr = buf_msg(skb); 2507 u32 dnode = msg_destnode(hdr); 2508 int mtyp = msg_type(hdr); 2509 u16 acked = msg_bcast_ack(hdr); 2510 u16 from = acked + 1; 2511 u16 to = msg_bcgap_to(hdr); 2512 u16 peers_snd_nxt = to + 1; 2513 int rc = 0; 2514 2515 kfree_skb(skb); 2516 2517 if (!tipc_link_is_up(l) || !l->bc_peer_is_up) 2518 return 0; 2519 2520 if (mtyp != STATE_MSG) 2521 return 0; 2522 2523 if (dnode == tipc_own_addr(l->net)) { 2524 rc = tipc_link_bc_ack_rcv(l, acked, to - acked, NULL, xmitq, 2525 xmitq); 2526 l->stats.recv_nacks++; 2527 return rc; 2528 } 2529 2530 /* Msg for other node => suppress own NACK at next sync if applicable */ 2531 if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) 2532 l->nack_state = BC_NACK_SND_SUPPRESS; 2533 2534 return 0; 2535} 2536 2537void tipc_link_set_queue_limits(struct tipc_link *l, u32 min_win, u32 max_win) 2538{ 2539 int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE); 2540 2541 l->min_win = min_win; 2542 l->ssthresh = max_win; 2543 l->max_win = max_win; 2544 l->window = min_win; 2545 l->backlog[TIPC_LOW_IMPORTANCE].limit = min_win * 2; 2546 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = min_win * 4; 2547 l->backlog[TIPC_HIGH_IMPORTANCE].limit = min_win * 6; 2548 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = min_win * 8; 2549 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; 2550} 2551 2552/** 2553 * tipc_link_reset_stats - reset link statistics 2554 * @l: pointer to link 2555 */ 2556void tipc_link_reset_stats(struct tipc_link *l) 2557{ 2558 memset(&l->stats, 0, sizeof(l->stats)); 2559} 2560 2561static void link_print(struct tipc_link *l, const char *str) 2562{ 2563 struct sk_buff *hskb = skb_peek(&l->transmq); 2564 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; 2565 u16 tail = l->snd_nxt - 1; 2566 2567 pr_info("%s Link <%s> state %x\n", str, l->name, l->state); 2568 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", 2569 skb_queue_len(&l->transmq), head, tail, 2570 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); 2571} 2572 2573/* Parse and validate nested (link) properties valid for media, bearer and link 2574 */ 2575int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) 2576{ 2577 int err; 2578 2579 err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop, 2580 tipc_nl_prop_policy, NULL); 2581 if (err) 2582 return err; 2583 2584 if (props[TIPC_NLA_PROP_PRIO]) { 2585 u32 prio; 2586 2587 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); 2588 if (prio > TIPC_MAX_LINK_PRI) 2589 return -EINVAL; 2590 } 2591 2592 if (props[TIPC_NLA_PROP_TOL]) { 2593 u32 tol; 2594 2595 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); 2596 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) 2597 return -EINVAL; 2598 } 2599 2600 if (props[TIPC_NLA_PROP_WIN]) { 2601 u32 max_win; 2602 2603 max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); 2604 if (max_win < TIPC_DEF_LINK_WIN || max_win > TIPC_MAX_LINK_WIN) 2605 return -EINVAL; 2606 } 2607 2608 return 0; 2609} 2610 2611static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) 2612{ 2613 int i; 2614 struct nlattr *stats; 2615 2616 struct nla_map { 2617 u32 key; 2618 u32 val; 2619 }; 2620 2621 struct nla_map map[] = { 2622 {TIPC_NLA_STATS_RX_INFO, 0}, 2623 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, 2624 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, 2625 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, 2626 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, 2627 {TIPC_NLA_STATS_TX_INFO, 0}, 2628 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, 2629 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, 2630 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, 2631 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, 2632 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? 2633 s->msg_length_counts : 1}, 2634 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, 2635 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, 2636 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, 2637 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, 2638 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, 2639 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, 2640 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, 2641 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, 2642 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, 2643 {TIPC_NLA_STATS_RX_STATES, s->recv_states}, 2644 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, 2645 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, 2646 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, 2647 {TIPC_NLA_STATS_TX_STATES, s->sent_states}, 2648 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, 2649 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, 2650 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, 2651 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, 2652 {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, 2653 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, 2654 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, 2655 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? 2656 (s->accu_queue_sz / s->queue_sz_counts) : 0} 2657 }; 2658 2659 stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); 2660 if (!stats) 2661 return -EMSGSIZE; 2662 2663 for (i = 0; i < ARRAY_SIZE(map); i++) 2664 if (nla_put_u32(skb, map[i].key, map[i].val)) 2665 goto msg_full; 2666 2667 nla_nest_end(skb, stats); 2668 2669 return 0; 2670msg_full: 2671 nla_nest_cancel(skb, stats); 2672 2673 return -EMSGSIZE; 2674} 2675 2676/* Caller should hold appropriate locks to protect the link */ 2677int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, 2678 struct tipc_link *link, int nlflags) 2679{ 2680 u32 self = tipc_own_addr(net); 2681 struct nlattr *attrs; 2682 struct nlattr *prop; 2683 void *hdr; 2684 int err; 2685 2686 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 2687 nlflags, TIPC_NL_LINK_GET); 2688 if (!hdr) 2689 return -EMSGSIZE; 2690 2691 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); 2692 if (!attrs) 2693 goto msg_full; 2694 2695 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) 2696 goto attr_msg_full; 2697 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self))) 2698 goto attr_msg_full; 2699 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) 2700 goto attr_msg_full; 2701 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) 2702 goto attr_msg_full; 2703 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) 2704 goto attr_msg_full; 2705 2706 if (tipc_link_is_up(link)) 2707 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) 2708 goto attr_msg_full; 2709 if (link->active) 2710 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) 2711 goto attr_msg_full; 2712 2713 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); 2714 if (!prop) 2715 goto attr_msg_full; 2716 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) 2717 goto prop_msg_full; 2718 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) 2719 goto prop_msg_full; 2720 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, 2721 link->window)) 2722 goto prop_msg_full; 2723 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) 2724 goto prop_msg_full; 2725 nla_nest_end(msg->skb, prop); 2726 2727 err = __tipc_nl_add_stats(msg->skb, &link->stats); 2728 if (err) 2729 goto attr_msg_full; 2730 2731 nla_nest_end(msg->skb, attrs); 2732 genlmsg_end(msg->skb, hdr); 2733 2734 return 0; 2735 2736prop_msg_full: 2737 nla_nest_cancel(msg->skb, prop); 2738attr_msg_full: 2739 nla_nest_cancel(msg->skb, attrs); 2740msg_full: 2741 genlmsg_cancel(msg->skb, hdr); 2742 2743 return -EMSGSIZE; 2744} 2745 2746static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, 2747 struct tipc_stats *stats) 2748{ 2749 int i; 2750 struct nlattr *nest; 2751 2752 struct nla_map { 2753 __u32 key; 2754 __u32 val; 2755 }; 2756 2757 struct nla_map map[] = { 2758 {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, 2759 {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, 2760 {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, 2761 {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, 2762 {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, 2763 {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, 2764 {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, 2765 {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, 2766 {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, 2767 {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, 2768 {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, 2769 {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, 2770 {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, 2771 {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, 2772 {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, 2773 {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, 2774 {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, 2775 {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, 2776 {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? 2777 (stats->accu_queue_sz / stats->queue_sz_counts) : 0} 2778 }; 2779 2780 nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); 2781 if (!nest) 2782 return -EMSGSIZE; 2783 2784 for (i = 0; i < ARRAY_SIZE(map); i++) 2785 if (nla_put_u32(skb, map[i].key, map[i].val)) 2786 goto msg_full; 2787 2788 nla_nest_end(skb, nest); 2789 2790 return 0; 2791msg_full: 2792 nla_nest_cancel(skb, nest); 2793 2794 return -EMSGSIZE; 2795} 2796 2797int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg, 2798 struct tipc_link *bcl) 2799{ 2800 int err; 2801 void *hdr; 2802 struct nlattr *attrs; 2803 struct nlattr *prop; 2804 u32 bc_mode = tipc_bcast_get_mode(net); 2805 u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net); 2806 2807 if (!bcl) 2808 return 0; 2809 2810 tipc_bcast_lock(net); 2811 2812 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, 2813 NLM_F_MULTI, TIPC_NL_LINK_GET); 2814 if (!hdr) { 2815 tipc_bcast_unlock(net); 2816 return -EMSGSIZE; 2817 } 2818 2819 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); 2820 if (!attrs) 2821 goto msg_full; 2822 2823 /* The broadcast link is always up */ 2824 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) 2825 goto attr_msg_full; 2826 2827 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) 2828 goto attr_msg_full; 2829 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) 2830 goto attr_msg_full; 2831 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) 2832 goto attr_msg_full; 2833 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) 2834 goto attr_msg_full; 2835 2836 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); 2837 if (!prop) 2838 goto attr_msg_full; 2839 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->max_win)) 2840 goto prop_msg_full; 2841 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode)) 2842 goto prop_msg_full; 2843 if (bc_mode & BCLINK_MODE_SEL) 2844 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO, 2845 bc_ratio)) 2846 goto prop_msg_full; 2847 nla_nest_end(msg->skb, prop); 2848 2849 err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); 2850 if (err) 2851 goto attr_msg_full; 2852 2853 tipc_bcast_unlock(net); 2854 nla_nest_end(msg->skb, attrs); 2855 genlmsg_end(msg->skb, hdr); 2856 2857 return 0; 2858 2859prop_msg_full: 2860 nla_nest_cancel(msg->skb, prop); 2861attr_msg_full: 2862 nla_nest_cancel(msg->skb, attrs); 2863msg_full: 2864 tipc_bcast_unlock(net); 2865 genlmsg_cancel(msg->skb, hdr); 2866 2867 return -EMSGSIZE; 2868} 2869 2870void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, 2871 struct sk_buff_head *xmitq) 2872{ 2873 l->tolerance = tol; 2874 if (l->bc_rcvlink) 2875 l->bc_rcvlink->tolerance = tol; 2876 if (link_is_up(l)) 2877 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); 2878} 2879 2880void tipc_link_set_prio(struct tipc_link *l, u32 prio, 2881 struct sk_buff_head *xmitq) 2882{ 2883 l->priority = prio; 2884 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); 2885} 2886 2887void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) 2888{ 2889 l->abort_limit = limit; 2890} 2891 2892/** 2893 * tipc_link_dump - dump TIPC link data 2894 * @l: tipc link to be dumped 2895 * @dqueues: bitmask to decide if any link queue to be dumped? 2896 * - TIPC_DUMP_NONE: don't dump link queues 2897 * - TIPC_DUMP_TRANSMQ: dump link transmq queue 2898 * - TIPC_DUMP_BACKLOGQ: dump link backlog queue 2899 * - TIPC_DUMP_DEFERDQ: dump link deferd queue 2900 * - TIPC_DUMP_INPUTQ: dump link input queue 2901 * - TIPC_DUMP_WAKEUP: dump link wakeup queue 2902 * - TIPC_DUMP_ALL: dump all the link queues above 2903 * @buf: returned buffer of dump data in format 2904 */ 2905int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf) 2906{ 2907 int i = 0; 2908 size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN; 2909 struct sk_buff_head *list; 2910 struct sk_buff *hskb, *tskb; 2911 u32 len; 2912 2913 if (!l) { 2914 i += scnprintf(buf, sz, "link data: (null)\n"); 2915 return i; 2916 } 2917 2918 i += scnprintf(buf, sz, "link data: %x", l->addr); 2919 i += scnprintf(buf + i, sz - i, " %x", l->state); 2920 i += scnprintf(buf + i, sz - i, " %u", l->in_session); 2921 i += scnprintf(buf + i, sz - i, " %u", l->session); 2922 i += scnprintf(buf + i, sz - i, " %u", l->peer_session); 2923 i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt); 2924 i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt); 2925 i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state); 2926 i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state); 2927 i += scnprintf(buf + i, sz - i, " %x", l->peer_caps); 2928 i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt); 2929 i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt); 2930 i += scnprintf(buf + i, sz - i, " %u", 0); 2931 i += scnprintf(buf + i, sz - i, " %u", 0); 2932 i += scnprintf(buf + i, sz - i, " %u", l->acked); 2933 2934 list = &l->transmq; 2935 len = skb_queue_len(list); 2936 hskb = skb_peek(list); 2937 tskb = skb_peek_tail(list); 2938 i += scnprintf(buf + i, sz - i, " | %u %u %u", len, 2939 (hskb) ? msg_seqno(buf_msg(hskb)) : 0, 2940 (tskb) ? msg_seqno(buf_msg(tskb)) : 0); 2941 2942 list = &l->deferdq; 2943 len = skb_queue_len(list); 2944 hskb = skb_peek(list); 2945 tskb = skb_peek_tail(list); 2946 i += scnprintf(buf + i, sz - i, " | %u %u %u", len, 2947 (hskb) ? msg_seqno(buf_msg(hskb)) : 0, 2948 (tskb) ? msg_seqno(buf_msg(tskb)) : 0); 2949 2950 list = &l->backlogq; 2951 len = skb_queue_len(list); 2952 hskb = skb_peek(list); 2953 tskb = skb_peek_tail(list); 2954 i += scnprintf(buf + i, sz - i, " | %u %u %u", len, 2955 (hskb) ? msg_seqno(buf_msg(hskb)) : 0, 2956 (tskb) ? msg_seqno(buf_msg(tskb)) : 0); 2957 2958 list = l->inputq; 2959 len = skb_queue_len(list); 2960 hskb = skb_peek(list); 2961 tskb = skb_peek_tail(list); 2962 i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len, 2963 (hskb) ? msg_seqno(buf_msg(hskb)) : 0, 2964 (tskb) ? msg_seqno(buf_msg(tskb)) : 0); 2965 2966 if (dqueues & TIPC_DUMP_TRANSMQ) { 2967 i += scnprintf(buf + i, sz - i, "transmq: "); 2968 i += tipc_list_dump(&l->transmq, false, buf + i); 2969 } 2970 if (dqueues & TIPC_DUMP_BACKLOGQ) { 2971 i += scnprintf(buf + i, sz - i, 2972 "backlogq: <%u %u %u %u %u>, ", 2973 l->backlog[TIPC_LOW_IMPORTANCE].len, 2974 l->backlog[TIPC_MEDIUM_IMPORTANCE].len, 2975 l->backlog[TIPC_HIGH_IMPORTANCE].len, 2976 l->backlog[TIPC_CRITICAL_IMPORTANCE].len, 2977 l->backlog[TIPC_SYSTEM_IMPORTANCE].len); 2978 i += tipc_list_dump(&l->backlogq, false, buf + i); 2979 } 2980 if (dqueues & TIPC_DUMP_DEFERDQ) { 2981 i += scnprintf(buf + i, sz - i, "deferdq: "); 2982 i += tipc_list_dump(&l->deferdq, false, buf + i); 2983 } 2984 if (dqueues & TIPC_DUMP_INPUTQ) { 2985 i += scnprintf(buf + i, sz - i, "inputq: "); 2986 i += tipc_list_dump(l->inputq, false, buf + i); 2987 } 2988 if (dqueues & TIPC_DUMP_WAKEUP) { 2989 i += scnprintf(buf + i, sz - i, "wakeup: "); 2990 i += tipc_list_dump(&l->wakeupq, false, buf + i); 2991 } 2992 2993 return i; 2994} 2995