1/*
   2 * net/tipc/node.c: TIPC node management routines
   3 *
   4 * Copyright (c) 2000-2006, 2012-2016, Ericsson AB
   5 * Copyright (c) 2005-2006, 2010-2014, 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 "link.h"
  39#include "node.h"
  40#include "name_distr.h"
  41#include "socket.h"
  42#include "bcast.h"
  43#include "monitor.h"
  44#include "discover.h"
  45#include "netlink.h"
  46#include "trace.h"
  47
  48#define INVALID_NODE_SIG	0x10000
  49#define NODE_CLEANUP_AFTER	300000
  50
  51/* Flags used to take different actions according to flag type
  52 * TIPC_NOTIFY_NODE_DOWN: notify node is down
  53 * TIPC_NOTIFY_NODE_UP: notify node is up
  54 * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
  55 */
  56enum {
  57	TIPC_NOTIFY_NODE_DOWN		= (1 << 3),
  58	TIPC_NOTIFY_NODE_UP		= (1 << 4),
  59	TIPC_NOTIFY_LINK_UP		= (1 << 6),
  60	TIPC_NOTIFY_LINK_DOWN		= (1 << 7)
  61};
  62
  63struct tipc_link_entry {
  64	struct tipc_link *link;
  65	spinlock_t lock; /* per link */
  66	u32 mtu;
  67	struct sk_buff_head inputq;
  68	struct tipc_media_addr maddr;
  69};
  70
  71struct tipc_bclink_entry {
  72	struct tipc_link *link;
  73	struct sk_buff_head inputq1;
  74	struct sk_buff_head arrvq;
  75	struct sk_buff_head inputq2;
  76	struct sk_buff_head namedq;
  77};
  78
  79/**
  80 * struct tipc_node - TIPC node structure
  81 * @addr: network address of node
  82 * @ref: reference counter to node object
  83 * @lock: rwlock governing access to structure
  84 * @net: the applicable net namespace
  85 * @hash: links to adjacent nodes in unsorted hash chain
  86 * @inputq: pointer to input queue containing messages for msg event
  87 * @namedq: pointer to name table input queue with name table messages
  88 * @active_links: bearer ids of active links, used as index into links[] array
  89 * @links: array containing references to all links to node
  90 * @action_flags: bit mask of different types of node actions
  91 * @state: connectivity state vs peer node
  92 * @sync_point: sequence number where synch/failover is finished
  93 * @list: links to adjacent nodes in sorted list of cluster's nodes
  94 * @working_links: number of working links to node (both active and standby)
  95 * @link_cnt: number of links to node
  96 * @capabilities: bitmap, indicating peer node's functional capabilities
  97 * @signature: node instance identifier
  98 * @link_id: local and remote bearer ids of changing link, if any
  99 * @publ_list: list of publications
 100 * @rcu: rcu struct for tipc_node
 101 * @delete_at: indicates the time for deleting a down node
 102 */
 103struct tipc_node {
 104	u32 addr;
 105	struct kref kref;
 106	rwlock_t lock;
 107	struct net *net;
 108	struct hlist_node hash;
 109	int active_links[2];
 110	struct tipc_link_entry links[MAX_BEARERS];
 111	struct tipc_bclink_entry bc_entry;
 112	int action_flags;
 113	struct list_head list;
 114	int state;
 115	bool failover_sent;
 116	u16 sync_point;
 117	int link_cnt;
 118	u16 working_links;
 119	u16 capabilities;
 120	u32 signature;
 121	u32 link_id;
 122	u8 peer_id[16];
 123	struct list_head publ_list;
 124	struct list_head conn_sks;
 125	unsigned long keepalive_intv;
 126	struct timer_list timer;
 127	struct rcu_head rcu;
 128	unsigned long delete_at;
 129};
 130
 131/* Node FSM states and events:
 132 */
 133enum {
 134	SELF_DOWN_PEER_DOWN    = 0xdd,
 135	SELF_UP_PEER_UP        = 0xaa,
 136	SELF_DOWN_PEER_LEAVING = 0xd1,
 137	SELF_UP_PEER_COMING    = 0xac,
 138	SELF_COMING_PEER_UP    = 0xca,
 139	SELF_LEAVING_PEER_DOWN = 0x1d,
 140	NODE_FAILINGOVER       = 0xf0,
 141	NODE_SYNCHING          = 0xcc
 142};
 143
 144enum {
 145	SELF_ESTABL_CONTACT_EVT = 0xece,
 146	SELF_LOST_CONTACT_EVT   = 0x1ce,
 147	PEER_ESTABL_CONTACT_EVT = 0x9ece,
 148	PEER_LOST_CONTACT_EVT   = 0x91ce,
 149	NODE_FAILOVER_BEGIN_EVT = 0xfbe,
 150	NODE_FAILOVER_END_EVT   = 0xfee,
 151	NODE_SYNCH_BEGIN_EVT    = 0xcbe,
 152	NODE_SYNCH_END_EVT      = 0xcee
 153};
 154
 155static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
 156				  struct sk_buff_head *xmitq,
 157				  struct tipc_media_addr **maddr);
 158static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
 159				bool delete);
 160static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
 161static void tipc_node_delete(struct tipc_node *node);
 162static void tipc_node_timeout(struct timer_list *t);
 163static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
 164static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
 165static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
 166static void tipc_node_put(struct tipc_node *node);
 167static bool node_is_up(struct tipc_node *n);
 168static void tipc_node_delete_from_list(struct tipc_node *node);
 169
 170struct tipc_sock_conn {
 171	u32 port;
 172	u32 peer_port;
 173	u32 peer_node;
 174	struct list_head list;
 175};
 176
 177static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
 178{
 179	int bearer_id = n->active_links[sel & 1];
 180
 181	if (unlikely(bearer_id == INVALID_BEARER_ID))
 182		return NULL;
 183
 184	return n->links[bearer_id].link;
 185}
 186
 187int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel)
 188{
 189	struct tipc_node *n;
 190	int bearer_id;
 191	unsigned int mtu = MAX_MSG_SIZE;
 192
 193	n = tipc_node_find(net, addr);
 194	if (unlikely(!n))
 195		return mtu;
 196
 197	bearer_id = n->active_links[sel & 1];
 198	if (likely(bearer_id != INVALID_BEARER_ID))
 199		mtu = n->links[bearer_id].mtu;
 200	tipc_node_put(n);
 201	return mtu;
 202}
 203
 204bool tipc_node_get_id(struct net *net, u32 addr, u8 *id)
 205{
 206	u8 *own_id = tipc_own_id(net);
 207	struct tipc_node *n;
 208
 209	if (!own_id)
 210		return true;
 211
 212	if (addr == tipc_own_addr(net)) {
 213		memcpy(id, own_id, TIPC_NODEID_LEN);
 214		return true;
 215	}
 216	n = tipc_node_find(net, addr);
 217	if (!n)
 218		return false;
 219
 220	memcpy(id, &n->peer_id, TIPC_NODEID_LEN);
 221	tipc_node_put(n);
 222	return true;
 223}
 224
 225u16 tipc_node_get_capabilities(struct net *net, u32 addr)
 226{
 227	struct tipc_node *n;
 228	u16 caps;
 229
 230	n = tipc_node_find(net, addr);
 231	if (unlikely(!n))
 232		return TIPC_NODE_CAPABILITIES;
 233	caps = n->capabilities;
 234	tipc_node_put(n);
 235	return caps;
 236}
 237
 238static void tipc_node_kref_release(struct kref *kref)
 239{
 240	struct tipc_node *n = container_of(kref, struct tipc_node, kref);
 241
 242	kfree(n->bc_entry.link);
 243	kfree_rcu(n, rcu);
 244}
 245
 246static void tipc_node_put(struct tipc_node *node)
 247{
 248	kref_put(&node->kref, tipc_node_kref_release);
 249}
 250
 251static void tipc_node_get(struct tipc_node *node)
 252{
 253	kref_get(&node->kref);
 254}
 255
 256/*
 257 * tipc_node_find - locate specified node object, if it exists
 258 */
 259static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
 260{
 261	struct tipc_net *tn = tipc_net(net);
 262	struct tipc_node *node;
 263	unsigned int thash = tipc_hashfn(addr);
 264
 
 
 
 265	rcu_read_lock();
 266	hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
 267		if (node->addr != addr)
 268			continue;
 269		if (!kref_get_unless_zero(&node->kref))
 270			node = NULL;
 271		break;
 272	}
 273	rcu_read_unlock();
 274	return node;
 275}
 276
 277/* tipc_node_find_by_id - locate specified node object by its 128-bit id
 278 * Note: this function is called only when a discovery request failed
 279 * to find the node by its 32-bit id, and is not time critical
 280 */
 281static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id)
 282{
 283	struct tipc_net *tn = tipc_net(net);
 284	struct tipc_node *n;
 285	bool found = false;
 286
 287	rcu_read_lock();
 288	list_for_each_entry_rcu(n, &tn->node_list, list) {
 289		read_lock_bh(&n->lock);
 290		if (!memcmp(id, n->peer_id, 16) &&
 291		    kref_get_unless_zero(&n->kref))
 292			found = true;
 293		read_unlock_bh(&n->lock);
 294		if (found)
 295			break;
 296	}
 297	rcu_read_unlock();
 298	return found ? n : NULL;
 299}
 300
 301static void tipc_node_read_lock(struct tipc_node *n)
 302{
 303	read_lock_bh(&n->lock);
 304}
 305
 306static void tipc_node_read_unlock(struct tipc_node *n)
 307{
 308	read_unlock_bh(&n->lock);
 309}
 310
 311static void tipc_node_write_lock(struct tipc_node *n)
 312{
 313	write_lock_bh(&n->lock);
 314}
 315
 316static void tipc_node_write_unlock_fast(struct tipc_node *n)
 317{
 318	write_unlock_bh(&n->lock);
 319}
 320
 321static void tipc_node_write_unlock(struct tipc_node *n)
 322{
 323	struct net *net = n->net;
 324	u32 addr = 0;
 325	u32 flags = n->action_flags;
 326	u32 link_id = 0;
 327	u32 bearer_id;
 328	struct list_head *publ_list;
 329
 330	if (likely(!flags)) {
 331		write_unlock_bh(&n->lock);
 332		return;
 333	}
 334
 335	addr = n->addr;
 336	link_id = n->link_id;
 337	bearer_id = link_id & 0xffff;
 338	publ_list = &n->publ_list;
 339
 340	n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
 341			     TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
 342
 343	write_unlock_bh(&n->lock);
 344
 345	if (flags & TIPC_NOTIFY_NODE_DOWN)
 346		tipc_publ_notify(net, publ_list, addr);
 347
 348	if (flags & TIPC_NOTIFY_NODE_UP)
 349		tipc_named_node_up(net, addr);
 350
 351	if (flags & TIPC_NOTIFY_LINK_UP) {
 352		tipc_mon_peer_up(net, addr, bearer_id);
 353		tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
 354				     TIPC_NODE_SCOPE, link_id, link_id);
 355	}
 356	if (flags & TIPC_NOTIFY_LINK_DOWN) {
 357		tipc_mon_peer_down(net, addr, bearer_id);
 358		tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
 359				      addr, link_id);
 360	}
 361}
 362
 363static struct tipc_node *tipc_node_create(struct net *net, u32 addr,
 364					  u8 *peer_id, u16 capabilities)
 365{
 366	struct tipc_net *tn = net_generic(net, tipc_net_id);
 367	struct tipc_node *n, *temp_node;
 368	struct tipc_link *l;
 369	int bearer_id;
 370	int i;
 371
 372	spin_lock_bh(&tn->node_list_lock);
 373	n = tipc_node_find(net, addr);
 374	if (n) {
 375		if (n->capabilities == capabilities)
 376			goto exit;
 377		/* Same node may come back with new capabilities */
 378		tipc_node_write_lock(n);
 379		n->capabilities = capabilities;
 380		for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
 381			l = n->links[bearer_id].link;
 382			if (l)
 383				tipc_link_update_caps(l, capabilities);
 384		}
 385		tipc_node_write_unlock_fast(n);
 386
 387		/* Calculate cluster capabilities */
 388		tn->capabilities = TIPC_NODE_CAPABILITIES;
 389		list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
 390			tn->capabilities &= temp_node->capabilities;
 391		}
 392		goto exit;
 393	}
 394	n = kzalloc(sizeof(*n), GFP_ATOMIC);
 395	if (!n) {
 396		pr_warn("Node creation failed, no memory\n");
 397		goto exit;
 398	}
 399	n->addr = addr;
 400	memcpy(&n->peer_id, peer_id, 16);
 401	n->net = net;
 402	n->capabilities = capabilities;
 403	kref_init(&n->kref);
 404	rwlock_init(&n->lock);
 405	INIT_HLIST_NODE(&n->hash);
 406	INIT_LIST_HEAD(&n->list);
 407	INIT_LIST_HEAD(&n->publ_list);
 408	INIT_LIST_HEAD(&n->conn_sks);
 409	skb_queue_head_init(&n->bc_entry.namedq);
 410	skb_queue_head_init(&n->bc_entry.inputq1);
 411	__skb_queue_head_init(&n->bc_entry.arrvq);
 412	skb_queue_head_init(&n->bc_entry.inputq2);
 413	for (i = 0; i < MAX_BEARERS; i++)
 414		spin_lock_init(&n->links[i].lock);
 415	n->state = SELF_DOWN_PEER_LEAVING;
 416	n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
 417	n->signature = INVALID_NODE_SIG;
 418	n->active_links[0] = INVALID_BEARER_ID;
 419	n->active_links[1] = INVALID_BEARER_ID;
 420	if (!tipc_link_bc_create(net, tipc_own_addr(net),
 421				 addr, U16_MAX,
 422				 tipc_link_window(tipc_bc_sndlink(net)),
 423				 n->capabilities,
 424				 &n->bc_entry.inputq1,
 425				 &n->bc_entry.namedq,
 426				 tipc_bc_sndlink(net),
 427				 &n->bc_entry.link)) {
 428		pr_warn("Broadcast rcv link creation failed, no memory\n");
 429		kfree(n);
 430		n = NULL;
 431		goto exit;
 432	}
 433	tipc_node_get(n);
 434	timer_setup(&n->timer, tipc_node_timeout, 0);
 435	n->keepalive_intv = U32_MAX;
 436	hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
 437	list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
 438		if (n->addr < temp_node->addr)
 439			break;
 440	}
 441	list_add_tail_rcu(&n->list, &temp_node->list);
 442	/* Calculate cluster capabilities */
 443	tn->capabilities = TIPC_NODE_CAPABILITIES;
 444	list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
 445		tn->capabilities &= temp_node->capabilities;
 446	}
 447	trace_tipc_node_create(n, true, " ");
 448exit:
 449	spin_unlock_bh(&tn->node_list_lock);
 450	return n;
 451}
 452
 453static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
 454{
 455	unsigned long tol = tipc_link_tolerance(l);
 456	unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
 
 457
 458	/* Link with lowest tolerance determines timer interval */
 459	if (intv < n->keepalive_intv)
 460		n->keepalive_intv = intv;
 461
 462	/* Ensure link's abort limit corresponds to current tolerance */
 463	tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
 464}
 465
 466static void tipc_node_delete_from_list(struct tipc_node *node)
 467{
 468	list_del_rcu(&node->list);
 469	hlist_del_rcu(&node->hash);
 470	tipc_node_put(node);
 471}
 472
 473static void tipc_node_delete(struct tipc_node *node)
 474{
 475	trace_tipc_node_delete(node, true, " ");
 476	tipc_node_delete_from_list(node);
 477
 478	del_timer_sync(&node->timer);
 479	tipc_node_put(node);
 480}
 481
 482void tipc_node_stop(struct net *net)
 483{
 484	struct tipc_net *tn = tipc_net(net);
 485	struct tipc_node *node, *t_node;
 486
 487	spin_lock_bh(&tn->node_list_lock);
 488	list_for_each_entry_safe(node, t_node, &tn->node_list, list)
 489		tipc_node_delete(node);
 490	spin_unlock_bh(&tn->node_list_lock);
 491}
 492
 493void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
 494{
 495	struct tipc_node *n;
 496
 497	if (in_own_node(net, addr))
 498		return;
 499
 500	n = tipc_node_find(net, addr);
 501	if (!n) {
 502		pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
 503		return;
 504	}
 505	tipc_node_write_lock(n);
 506	list_add_tail(subscr, &n->publ_list);
 507	tipc_node_write_unlock_fast(n);
 508	tipc_node_put(n);
 509}
 510
 511void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
 512{
 513	struct tipc_node *n;
 514
 515	if (in_own_node(net, addr))
 516		return;
 517
 518	n = tipc_node_find(net, addr);
 519	if (!n) {
 520		pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
 521		return;
 522	}
 523	tipc_node_write_lock(n);
 524	list_del_init(subscr);
 525	tipc_node_write_unlock_fast(n);
 526	tipc_node_put(n);
 527}
 528
 529int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
 530{
 531	struct tipc_node *node;
 532	struct tipc_sock_conn *conn;
 533	int err = 0;
 534
 535	if (in_own_node(net, dnode))
 536		return 0;
 537
 538	node = tipc_node_find(net, dnode);
 539	if (!node) {
 540		pr_warn("Connecting sock to node 0x%x failed\n", dnode);
 541		return -EHOSTUNREACH;
 542	}
 543	conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
 544	if (!conn) {
 545		err = -EHOSTUNREACH;
 546		goto exit;
 547	}
 548	conn->peer_node = dnode;
 549	conn->port = port;
 550	conn->peer_port = peer_port;
 551
 552	tipc_node_write_lock(node);
 553	list_add_tail(&conn->list, &node->conn_sks);
 554	tipc_node_write_unlock(node);
 555exit:
 556	tipc_node_put(node);
 557	return err;
 558}
 559
 560void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
 561{
 562	struct tipc_node *node;
 563	struct tipc_sock_conn *conn, *safe;
 564
 565	if (in_own_node(net, dnode))
 566		return;
 567
 568	node = tipc_node_find(net, dnode);
 569	if (!node)
 570		return;
 571
 572	tipc_node_write_lock(node);
 573	list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
 574		if (port != conn->port)
 575			continue;
 576		list_del(&conn->list);
 577		kfree(conn);
 578	}
 579	tipc_node_write_unlock(node);
 580	tipc_node_put(node);
 581}
 582
 583static void  tipc_node_clear_links(struct tipc_node *node)
 584{
 585	int i;
 586
 587	for (i = 0; i < MAX_BEARERS; i++) {
 588		struct tipc_link_entry *le = &node->links[i];
 589
 590		if (le->link) {
 591			kfree(le->link);
 592			le->link = NULL;
 593			node->link_cnt--;
 594		}
 595	}
 596}
 597
 598/* tipc_node_cleanup - delete nodes that does not
 599 * have active links for NODE_CLEANUP_AFTER time
 600 */
 601static bool tipc_node_cleanup(struct tipc_node *peer)
 602{
 603	struct tipc_node *temp_node;
 604	struct tipc_net *tn = tipc_net(peer->net);
 605	bool deleted = false;
 606
 607	/* If lock held by tipc_node_stop() the node will be deleted anyway */
 608	if (!spin_trylock_bh(&tn->node_list_lock))
 609		return false;
 610
 611	tipc_node_write_lock(peer);
 612
 613	if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) {
 614		tipc_node_clear_links(peer);
 615		tipc_node_delete_from_list(peer);
 616		deleted = true;
 617	}
 618	tipc_node_write_unlock(peer);
 619
 620	/* Calculate cluster capabilities */
 621	tn->capabilities = TIPC_NODE_CAPABILITIES;
 622	list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
 623		tn->capabilities &= temp_node->capabilities;
 624	}
 625
 626	spin_unlock_bh(&tn->node_list_lock);
 627	return deleted;
 628}
 629
 630/* tipc_node_timeout - handle expiration of node timer
 631 */
 632static void tipc_node_timeout(struct timer_list *t)
 633{
 634	struct tipc_node *n = from_timer(n, t, timer);
 635	struct tipc_link_entry *le;
 636	struct sk_buff_head xmitq;
 637	int remains = n->link_cnt;
 638	int bearer_id;
 639	int rc = 0;
 640
 641	trace_tipc_node_timeout(n, false, " ");
 642	if (!node_is_up(n) && tipc_node_cleanup(n)) {
 643		/*Removing the reference of Timer*/
 644		tipc_node_put(n);
 645		return;
 646	}
 647
 648	__skb_queue_head_init(&xmitq);
 649
 650	/* Initial node interval to value larger (10 seconds), then it will be
 651	 * recalculated with link lowest tolerance
 652	 */
 653	tipc_node_read_lock(n);
 654	n->keepalive_intv = 10000;
 655	tipc_node_read_unlock(n);
 656	for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) {
 657		tipc_node_read_lock(n);
 658		le = &n->links[bearer_id];
 
 659		if (le->link) {
 660			spin_lock_bh(&le->lock);
 661			/* Link tolerance may change asynchronously: */
 662			tipc_node_calculate_timer(n, le->link);
 663			rc = tipc_link_timeout(le->link, &xmitq);
 664			spin_unlock_bh(&le->lock);
 665			remains--;
 666		}
 
 667		tipc_node_read_unlock(n);
 668		tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
 669		if (rc & TIPC_LINK_DOWN_EVT)
 670			tipc_node_link_down(n, bearer_id, false);
 671	}
 672	mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
 673}
 674
 675/**
 676 * __tipc_node_link_up - handle addition of link
 677 * Node lock must be held by caller
 678 * Link becomes active (alone or shared) or standby, depending on its priority.
 679 */
 680static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
 681				struct sk_buff_head *xmitq)
 682{
 683	int *slot0 = &n->active_links[0];
 684	int *slot1 = &n->active_links[1];
 685	struct tipc_link *ol = node_active_link(n, 0);
 686	struct tipc_link *nl = n->links[bearer_id].link;
 687
 688	if (!nl || tipc_link_is_up(nl))
 689		return;
 690
 691	tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
 692	if (!tipc_link_is_up(nl))
 693		return;
 694
 695	n->working_links++;
 696	n->action_flags |= TIPC_NOTIFY_LINK_UP;
 697	n->link_id = tipc_link_id(nl);
 698
 699	/* Leave room for tunnel header when returning 'mtu' to users: */
 700	n->links[bearer_id].mtu = tipc_link_mtu(nl) - INT_H_SIZE;
 701
 702	tipc_bearer_add_dest(n->net, bearer_id, n->addr);
 703	tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
 704
 705	pr_debug("Established link <%s> on network plane %c\n",
 706		 tipc_link_name(nl), tipc_link_plane(nl));
 707	trace_tipc_node_link_up(n, true, " ");
 708
 709	/* Ensure that a STATE message goes first */
 710	tipc_link_build_state_msg(nl, xmitq);
 711
 712	/* First link? => give it both slots */
 713	if (!ol) {
 714		*slot0 = bearer_id;
 715		*slot1 = bearer_id;
 716		tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
 717		n->action_flags |= TIPC_NOTIFY_NODE_UP;
 718		tipc_link_set_active(nl, true);
 719		tipc_bcast_add_peer(n->net, nl, xmitq);
 720		return;
 721	}
 722
 723	/* Second link => redistribute slots */
 724	if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
 725		pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
 726		*slot0 = bearer_id;
 727		*slot1 = bearer_id;
 728		tipc_link_set_active(nl, true);
 729		tipc_link_set_active(ol, false);
 730	} else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
 731		tipc_link_set_active(nl, true);
 732		*slot1 = bearer_id;
 733	} else {
 734		pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
 735	}
 736
 737	/* Prepare synchronization with first link */
 738	tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
 739}
 740
 741/**
 742 * tipc_node_link_up - handle addition of link
 743 *
 744 * Link becomes active (alone or shared) or standby, depending on its priority.
 745 */
 746static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
 747			      struct sk_buff_head *xmitq)
 748{
 749	struct tipc_media_addr *maddr;
 750
 751	tipc_node_write_lock(n);
 752	__tipc_node_link_up(n, bearer_id, xmitq);
 753	maddr = &n->links[bearer_id].maddr;
 754	tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr);
 755	tipc_node_write_unlock(n);
 756}
 757
 758/**
 759 * tipc_node_link_failover() - start failover in case "half-failover"
 760 *
 761 * This function is only called in a very special situation where link
 762 * failover can be already started on peer node but not on this node.
 763 * This can happen when e.g.
 764 *	1. Both links <1A-2A>, <1B-2B> down
 765 *	2. Link endpoint 2A up, but 1A still down (e.g. due to network
 766 *	   disturbance, wrong session, etc.)
 767 *	3. Link <1B-2B> up
 768 *	4. Link endpoint 2A down (e.g. due to link tolerance timeout)
 769 *	5. Node 2 starts failover onto link <1B-2B>
 770 *
 771 *	==> Node 1 does never start link/node failover!
 772 *
 773 * @n: tipc node structure
 774 * @l: link peer endpoint failingover (- can be NULL)
 775 * @tnl: tunnel link
 776 * @xmitq: queue for messages to be xmited on tnl link later
 777 */
 778static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,
 779				    struct tipc_link *tnl,
 780				    struct sk_buff_head *xmitq)
 781{
 782	/* Avoid to be "self-failover" that can never end */
 783	if (!tipc_link_is_up(tnl))
 784		return;
 785
 786	/* Don't rush, failure link may be in the process of resetting */
 787	if (l && !tipc_link_is_reset(l))
 788		return;
 789
 790	tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
 791	tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
 792
 793	n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
 794	tipc_link_failover_prepare(l, tnl, xmitq);
 795
 796	if (l)
 797		tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
 798	tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
 799}
 800
 801/**
 802 * __tipc_node_link_down - handle loss of link
 803 */
 804static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
 805				  struct sk_buff_head *xmitq,
 806				  struct tipc_media_addr **maddr)
 807{
 808	struct tipc_link_entry *le = &n->links[*bearer_id];
 809	int *slot0 = &n->active_links[0];
 810	int *slot1 = &n->active_links[1];
 811	int i, highest = 0, prio;
 812	struct tipc_link *l, *_l, *tnl;
 813
 814	l = n->links[*bearer_id].link;
 815	if (!l || tipc_link_is_reset(l))
 816		return;
 817
 818	n->working_links--;
 819	n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
 820	n->link_id = tipc_link_id(l);
 821
 822	tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
 823
 824	pr_debug("Lost link <%s> on network plane %c\n",
 825		 tipc_link_name(l), tipc_link_plane(l));
 826
 827	/* Select new active link if any available */
 828	*slot0 = INVALID_BEARER_ID;
 829	*slot1 = INVALID_BEARER_ID;
 830	for (i = 0; i < MAX_BEARERS; i++) {
 831		_l = n->links[i].link;
 832		if (!_l || !tipc_link_is_up(_l))
 833			continue;
 834		if (_l == l)
 835			continue;
 836		prio = tipc_link_prio(_l);
 837		if (prio < highest)
 838			continue;
 839		if (prio > highest) {
 840			highest = prio;
 841			*slot0 = i;
 842			*slot1 = i;
 843			continue;
 844		}
 845		*slot1 = i;
 846	}
 847
 848	if (!node_is_up(n)) {
 849		if (tipc_link_peer_is_down(l))
 850			tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
 851		tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
 852		trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!");
 853		tipc_link_fsm_evt(l, LINK_RESET_EVT);
 854		tipc_link_reset(l);
 855		tipc_link_build_reset_msg(l, xmitq);
 856		*maddr = &n->links[*bearer_id].maddr;
 857		node_lost_contact(n, &le->inputq);
 858		tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
 859		return;
 860	}
 861	tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
 862
 863	/* There is still a working link => initiate failover */
 864	*bearer_id = n->active_links[0];
 865	tnl = n->links[*bearer_id].link;
 866	tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
 867	tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
 868	n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
 869	tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
 870	trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!");
 871	tipc_link_reset(l);
 872	tipc_link_fsm_evt(l, LINK_RESET_EVT);
 873	tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
 874	tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
 875	*maddr = &n->links[*bearer_id].maddr;
 876}
 877
 878static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
 879{
 880	struct tipc_link_entry *le = &n->links[bearer_id];
 881	struct tipc_media_addr *maddr = NULL;
 882	struct tipc_link *l = le->link;
 883	int old_bearer_id = bearer_id;
 884	struct sk_buff_head xmitq;
 885
 886	if (!l)
 887		return;
 888
 889	__skb_queue_head_init(&xmitq);
 890
 891	tipc_node_write_lock(n);
 892	if (!tipc_link_is_establishing(l)) {
 893		__tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
 
 
 
 
 
 894	} else {
 895		/* Defuse pending tipc_node_link_up() */
 896		tipc_link_reset(l);
 897		tipc_link_fsm_evt(l, LINK_RESET_EVT);
 898	}
 899	if (delete) {
 900		kfree(l);
 901		le->link = NULL;
 902		n->link_cnt--;
 903	}
 904	trace_tipc_node_link_down(n, true, "node link down or deleted!");
 905	tipc_node_write_unlock(n);
 906	if (delete)
 907		tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
 908	if (!skb_queue_empty(&xmitq))
 909		tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
 910	tipc_sk_rcv(n->net, &le->inputq);
 911}
 912
 913static bool node_is_up(struct tipc_node *n)
 914{
 915	return n->active_links[0] != INVALID_BEARER_ID;
 916}
 917
 918bool tipc_node_is_up(struct net *net, u32 addr)
 919{
 920	struct tipc_node *n;
 921	bool retval = false;
 922
 923	if (in_own_node(net, addr))
 924		return true;
 925
 926	n = tipc_node_find(net, addr);
 927	if (!n)
 928		return false;
 929	retval = node_is_up(n);
 930	tipc_node_put(n);
 931	return retval;
 932}
 933
 934static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
 935{
 936	struct tipc_node *n;
 937
 938	addr ^= tipc_net(net)->random;
 939	while ((n = tipc_node_find(net, addr))) {
 940		tipc_node_put(n);
 941		addr++;
 942	}
 943	return addr;
 944}
 945
 946/* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
 947 * Returns suggested address if any, otherwise 0
 948 */
 949u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
 950{
 951	struct tipc_net *tn = tipc_net(net);
 952	struct tipc_node *n;
 953
 954	/* Suggest new address if some other peer is using this one */
 955	n = tipc_node_find(net, addr);
 956	if (n) {
 957		if (!memcmp(n->peer_id, id, NODE_ID_LEN))
 958			addr = 0;
 959		tipc_node_put(n);
 960		if (!addr)
 961			return 0;
 962		return tipc_node_suggest_addr(net, addr);
 963	}
 964
 965	/* Suggest previously used address if peer is known */
 966	n = tipc_node_find_by_id(net, id);
 967	if (n) {
 968		addr = n->addr;
 969		tipc_node_put(n);
 970		return addr;
 971	}
 972
 973	/* Even this node may be in conflict */
 974	if (tn->trial_addr == addr)
 975		return tipc_node_suggest_addr(net, addr);
 976
 977	return 0;
 978}
 979
 980void tipc_node_check_dest(struct net *net, u32 addr,
 981			  u8 *peer_id, struct tipc_bearer *b,
 982			  u16 capabilities, u32 signature,
 983			  struct tipc_media_addr *maddr,
 984			  bool *respond, bool *dupl_addr)
 985{
 986	struct tipc_node *n;
 987	struct tipc_link *l;
 988	struct tipc_link_entry *le;
 989	bool addr_match = false;
 990	bool sign_match = false;
 991	bool link_up = false;
 992	bool accept_addr = false;
 993	bool reset = true;
 994	char *if_name;
 995	unsigned long intv;
 996	u16 session;
 997
 998	*dupl_addr = false;
 999	*respond = false;
1000
1001	n = tipc_node_create(net, addr, peer_id, capabilities);
1002	if (!n)
1003		return;
1004
1005	tipc_node_write_lock(n);
1006
1007	le = &n->links[b->identity];
1008
1009	/* Prepare to validate requesting node's signature and media address */
1010	l = le->link;
1011	link_up = l && tipc_link_is_up(l);
1012	addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
1013	sign_match = (signature == n->signature);
1014
1015	/* These three flags give us eight permutations: */
1016
1017	if (sign_match && addr_match && link_up) {
1018		/* All is fine. Do nothing. */
1019		reset = false;
1020	} else if (sign_match && addr_match && !link_up) {
1021		/* Respond. The link will come up in due time */
1022		*respond = true;
1023	} else if (sign_match && !addr_match && link_up) {
1024		/* Peer has changed i/f address without rebooting.
1025		 * If so, the link will reset soon, and the next
1026		 * discovery will be accepted. So we can ignore it.
1027		 * It may also be an cloned or malicious peer having
1028		 * chosen the same node address and signature as an
1029		 * existing one.
1030		 * Ignore requests until the link goes down, if ever.
1031		 */
1032		*dupl_addr = true;
1033	} else if (sign_match && !addr_match && !link_up) {
1034		/* Peer link has changed i/f address without rebooting.
1035		 * It may also be a cloned or malicious peer; we can't
1036		 * distinguish between the two.
1037		 * The signature is correct, so we must accept.
1038		 */
1039		accept_addr = true;
1040		*respond = true;
1041	} else if (!sign_match && addr_match && link_up) {
1042		/* Peer node rebooted. Two possibilities:
1043		 *  - Delayed re-discovery; this link endpoint has already
1044		 *    reset and re-established contact with the peer, before
1045		 *    receiving a discovery message from that node.
1046		 *    (The peer happened to receive one from this node first).
1047		 *  - The peer came back so fast that our side has not
1048		 *    discovered it yet. Probing from this side will soon
1049		 *    reset the link, since there can be no working link
1050		 *    endpoint at the peer end, and the link will re-establish.
1051		 *  Accept the signature, since it comes from a known peer.
1052		 */
1053		n->signature = signature;
1054	} else if (!sign_match && addr_match && !link_up) {
1055		/*  The peer node has rebooted.
1056		 *  Accept signature, since it is a known peer.
1057		 */
1058		n->signature = signature;
1059		*respond = true;
1060	} else if (!sign_match && !addr_match && link_up) {
1061		/* Peer rebooted with new address, or a new/duplicate peer.
1062		 * Ignore until the link goes down, if ever.
1063		 */
1064		*dupl_addr = true;
1065	} else if (!sign_match && !addr_match && !link_up) {
1066		/* Peer rebooted with new address, or it is a new peer.
1067		 * Accept signature and address.
1068		 */
1069		n->signature = signature;
1070		accept_addr = true;
1071		*respond = true;
1072	}
1073
1074	if (!accept_addr)
1075		goto exit;
1076
1077	/* Now create new link if not already existing */
1078	if (!l) {
1079		if (n->link_cnt == 2)
 
1080			goto exit;
1081
1082		if_name = strchr(b->name, ':') + 1;
1083		get_random_bytes(&session, sizeof(u16));
1084		if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
1085				      b->net_plane, b->mtu, b->priority,
1086				      b->window, session,
1087				      tipc_own_addr(net), addr, peer_id,
1088				      n->capabilities,
1089				      tipc_bc_sndlink(n->net), n->bc_entry.link,
1090				      &le->inputq,
1091				      &n->bc_entry.namedq, &l)) {
1092			*respond = false;
1093			goto exit;
1094		}
1095		trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!");
1096		tipc_link_reset(l);
1097		tipc_link_fsm_evt(l, LINK_RESET_EVT);
1098		if (n->state == NODE_FAILINGOVER)
1099			tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1100		le->link = l;
1101		n->link_cnt++;
1102		tipc_node_calculate_timer(n, l);
1103		if (n->link_cnt == 1) {
1104			intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
1105			if (!mod_timer(&n->timer, intv))
1106				tipc_node_get(n);
1107		}
1108	}
1109	memcpy(&le->maddr, maddr, sizeof(*maddr));
1110exit:
1111	tipc_node_write_unlock(n);
1112	if (reset && l && !tipc_link_is_reset(l))
1113		tipc_node_link_down(n, b->identity, false);
1114	tipc_node_put(n);
1115}
1116
1117void tipc_node_delete_links(struct net *net, int bearer_id)
1118{
1119	struct tipc_net *tn = net_generic(net, tipc_net_id);
1120	struct tipc_node *n;
1121
1122	rcu_read_lock();
1123	list_for_each_entry_rcu(n, &tn->node_list, list) {
1124		tipc_node_link_down(n, bearer_id, true);
1125	}
1126	rcu_read_unlock();
1127}
1128
1129static void tipc_node_reset_links(struct tipc_node *n)
1130{
 
1131	int i;
1132
1133	pr_warn("Resetting all links to %x\n", n->addr);
 
1134
1135	trace_tipc_node_reset_links(n, true, " ");
1136	for (i = 0; i < MAX_BEARERS; i++) {
1137		tipc_node_link_down(n, i, false);
1138	}
1139}
1140
1141/* tipc_node_fsm_evt - node finite state machine
1142 * Determines when contact is allowed with peer node
1143 */
1144static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
1145{
1146	int state = n->state;
1147
1148	switch (state) {
1149	case SELF_DOWN_PEER_DOWN:
1150		switch (evt) {
1151		case SELF_ESTABL_CONTACT_EVT:
1152			state = SELF_UP_PEER_COMING;
1153			break;
1154		case PEER_ESTABL_CONTACT_EVT:
1155			state = SELF_COMING_PEER_UP;
1156			break;
1157		case SELF_LOST_CONTACT_EVT:
1158		case PEER_LOST_CONTACT_EVT:
1159			break;
1160		case NODE_SYNCH_END_EVT:
1161		case NODE_SYNCH_BEGIN_EVT:
1162		case NODE_FAILOVER_BEGIN_EVT:
1163		case NODE_FAILOVER_END_EVT:
1164		default:
1165			goto illegal_evt;
1166		}
1167		break;
1168	case SELF_UP_PEER_UP:
1169		switch (evt) {
1170		case SELF_LOST_CONTACT_EVT:
1171			state = SELF_DOWN_PEER_LEAVING;
1172			break;
1173		case PEER_LOST_CONTACT_EVT:
1174			state = SELF_LEAVING_PEER_DOWN;
1175			break;
1176		case NODE_SYNCH_BEGIN_EVT:
1177			state = NODE_SYNCHING;
1178			break;
1179		case NODE_FAILOVER_BEGIN_EVT:
1180			state = NODE_FAILINGOVER;
1181			break;
1182		case SELF_ESTABL_CONTACT_EVT:
1183		case PEER_ESTABL_CONTACT_EVT:
1184		case NODE_SYNCH_END_EVT:
1185		case NODE_FAILOVER_END_EVT:
1186			break;
1187		default:
1188			goto illegal_evt;
1189		}
1190		break;
1191	case SELF_DOWN_PEER_LEAVING:
1192		switch (evt) {
1193		case PEER_LOST_CONTACT_EVT:
1194			state = SELF_DOWN_PEER_DOWN;
1195			break;
1196		case SELF_ESTABL_CONTACT_EVT:
1197		case PEER_ESTABL_CONTACT_EVT:
1198		case SELF_LOST_CONTACT_EVT:
1199			break;
1200		case NODE_SYNCH_END_EVT:
1201		case NODE_SYNCH_BEGIN_EVT:
1202		case NODE_FAILOVER_BEGIN_EVT:
1203		case NODE_FAILOVER_END_EVT:
1204		default:
1205			goto illegal_evt;
1206		}
1207		break;
1208	case SELF_UP_PEER_COMING:
1209		switch (evt) {
1210		case PEER_ESTABL_CONTACT_EVT:
1211			state = SELF_UP_PEER_UP;
1212			break;
1213		case SELF_LOST_CONTACT_EVT:
1214			state = SELF_DOWN_PEER_DOWN;
1215			break;
1216		case SELF_ESTABL_CONTACT_EVT:
1217		case PEER_LOST_CONTACT_EVT:
1218		case NODE_SYNCH_END_EVT:
1219		case NODE_FAILOVER_BEGIN_EVT:
1220			break;
1221		case NODE_SYNCH_BEGIN_EVT:
1222		case NODE_FAILOVER_END_EVT:
1223		default:
1224			goto illegal_evt;
1225		}
1226		break;
1227	case SELF_COMING_PEER_UP:
1228		switch (evt) {
1229		case SELF_ESTABL_CONTACT_EVT:
1230			state = SELF_UP_PEER_UP;
1231			break;
1232		case PEER_LOST_CONTACT_EVT:
1233			state = SELF_DOWN_PEER_DOWN;
1234			break;
1235		case SELF_LOST_CONTACT_EVT:
1236		case PEER_ESTABL_CONTACT_EVT:
1237			break;
1238		case NODE_SYNCH_END_EVT:
1239		case NODE_SYNCH_BEGIN_EVT:
1240		case NODE_FAILOVER_BEGIN_EVT:
1241		case NODE_FAILOVER_END_EVT:
1242		default:
1243			goto illegal_evt;
1244		}
1245		break;
1246	case SELF_LEAVING_PEER_DOWN:
1247		switch (evt) {
1248		case SELF_LOST_CONTACT_EVT:
1249			state = SELF_DOWN_PEER_DOWN;
1250			break;
1251		case SELF_ESTABL_CONTACT_EVT:
1252		case PEER_ESTABL_CONTACT_EVT:
1253		case PEER_LOST_CONTACT_EVT:
1254			break;
1255		case NODE_SYNCH_END_EVT:
1256		case NODE_SYNCH_BEGIN_EVT:
1257		case NODE_FAILOVER_BEGIN_EVT:
1258		case NODE_FAILOVER_END_EVT:
1259		default:
1260			goto illegal_evt;
1261		}
1262		break;
1263	case NODE_FAILINGOVER:
1264		switch (evt) {
1265		case SELF_LOST_CONTACT_EVT:
1266			state = SELF_DOWN_PEER_LEAVING;
1267			break;
1268		case PEER_LOST_CONTACT_EVT:
1269			state = SELF_LEAVING_PEER_DOWN;
1270			break;
1271		case NODE_FAILOVER_END_EVT:
1272			state = SELF_UP_PEER_UP;
1273			break;
1274		case NODE_FAILOVER_BEGIN_EVT:
1275		case SELF_ESTABL_CONTACT_EVT:
1276		case PEER_ESTABL_CONTACT_EVT:
1277			break;
1278		case NODE_SYNCH_BEGIN_EVT:
1279		case NODE_SYNCH_END_EVT:
1280		default:
1281			goto illegal_evt;
1282		}
1283		break;
1284	case NODE_SYNCHING:
1285		switch (evt) {
1286		case SELF_LOST_CONTACT_EVT:
1287			state = SELF_DOWN_PEER_LEAVING;
1288			break;
1289		case PEER_LOST_CONTACT_EVT:
1290			state = SELF_LEAVING_PEER_DOWN;
1291			break;
1292		case NODE_SYNCH_END_EVT:
1293			state = SELF_UP_PEER_UP;
1294			break;
1295		case NODE_FAILOVER_BEGIN_EVT:
1296			state = NODE_FAILINGOVER;
1297			break;
1298		case NODE_SYNCH_BEGIN_EVT:
1299		case SELF_ESTABL_CONTACT_EVT:
1300		case PEER_ESTABL_CONTACT_EVT:
1301			break;
1302		case NODE_FAILOVER_END_EVT:
1303		default:
1304			goto illegal_evt;
1305		}
1306		break;
1307	default:
1308		pr_err("Unknown node fsm state %x\n", state);
1309		break;
1310	}
1311	trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1312	n->state = state;
1313	return;
1314
1315illegal_evt:
1316	pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1317	trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1318}
1319
1320static void node_lost_contact(struct tipc_node *n,
1321			      struct sk_buff_head *inputq)
1322{
 
1323	struct tipc_sock_conn *conn, *safe;
1324	struct tipc_link *l;
1325	struct list_head *conns = &n->conn_sks;
1326	struct sk_buff *skb;
1327	uint i;
1328
1329	pr_debug("Lost contact with %x\n", n->addr);
1330	n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
1331	trace_tipc_node_lost_contact(n, true, " ");
1332
1333	/* Clean up broadcast state */
1334	tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1335
1336	/* Abort any ongoing link failover */
1337	for (i = 0; i < MAX_BEARERS; i++) {
1338		l = n->links[i].link;
1339		if (l)
1340			tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1341	}
1342
1343	/* Notify publications from this node */
1344	n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1345
1346	/* Notify sockets connected to node */
1347	list_for_each_entry_safe(conn, safe, conns, list) {
1348		skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1349				      SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1350				      conn->peer_node, conn->port,
1351				      conn->peer_port, TIPC_ERR_NO_NODE);
1352		if (likely(skb))
1353			skb_queue_tail(inputq, skb);
1354		list_del(&conn->list);
1355		kfree(conn);
1356	}
1357}
1358
1359/**
1360 * tipc_node_get_linkname - get the name of a link
1361 *
1362 * @bearer_id: id of the bearer
1363 * @node: peer node address
1364 * @linkname: link name output buffer
1365 *
1366 * Returns 0 on success
1367 */
1368int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1369			   char *linkname, size_t len)
1370{
1371	struct tipc_link *link;
1372	int err = -EINVAL;
1373	struct tipc_node *node = tipc_node_find(net, addr);
1374
1375	if (!node)
1376		return err;
1377
1378	if (bearer_id >= MAX_BEARERS)
1379		goto exit;
1380
1381	tipc_node_read_lock(node);
1382	link = node->links[bearer_id].link;
1383	if (link) {
1384		strncpy(linkname, tipc_link_name(link), len);
1385		err = 0;
1386	}
1387	tipc_node_read_unlock(node);
1388exit:
 
1389	tipc_node_put(node);
1390	return err;
1391}
1392
1393/* Caller should hold node lock for the passed node */
1394static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1395{
1396	void *hdr;
1397	struct nlattr *attrs;
1398
1399	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1400			  NLM_F_MULTI, TIPC_NL_NODE_GET);
1401	if (!hdr)
1402		return -EMSGSIZE;
1403
1404	attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NODE);
1405	if (!attrs)
1406		goto msg_full;
1407
1408	if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1409		goto attr_msg_full;
1410	if (node_is_up(node))
1411		if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1412			goto attr_msg_full;
1413
1414	nla_nest_end(msg->skb, attrs);
1415	genlmsg_end(msg->skb, hdr);
1416
1417	return 0;
1418
1419attr_msg_full:
1420	nla_nest_cancel(msg->skb, attrs);
1421msg_full:
1422	genlmsg_cancel(msg->skb, hdr);
1423
1424	return -EMSGSIZE;
1425}
1426
1427/**
1428 * tipc_node_xmit() is the general link level function for message sending
1429 * @net: the applicable net namespace
1430 * @list: chain of buffers containing message
1431 * @dnode: address of destination node
1432 * @selector: a number used for deterministic link selection
1433 * Consumes the buffer chain.
1434 * Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1435 */
1436int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1437		   u32 dnode, int selector)
1438{
1439	struct tipc_link_entry *le = NULL;
1440	struct tipc_node *n;
1441	struct sk_buff_head xmitq;
1442	int bearer_id;
1443	int rc;
1444
1445	if (in_own_node(net, dnode)) {
1446		tipc_loopback_trace(net, list);
1447		spin_lock_init(&list->lock);
1448		tipc_sk_rcv(net, list);
1449		return 0;
1450	}
1451
1452	n = tipc_node_find(net, dnode);
1453	if (unlikely(!n)) {
1454		__skb_queue_purge(list);
1455		return -EHOSTUNREACH;
1456	}
1457
1458	tipc_node_read_lock(n);
1459	bearer_id = n->active_links[selector & 1];
1460	if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1461		tipc_node_read_unlock(n);
1462		tipc_node_put(n);
1463		__skb_queue_purge(list);
1464		return -EHOSTUNREACH;
1465	}
1466
1467	__skb_queue_head_init(&xmitq);
1468	le = &n->links[bearer_id];
1469	spin_lock_bh(&le->lock);
1470	rc = tipc_link_xmit(le->link, list, &xmitq);
1471	spin_unlock_bh(&le->lock);
1472	tipc_node_read_unlock(n);
1473
1474	if (unlikely(rc == -ENOBUFS))
1475		tipc_node_link_down(n, bearer_id, false);
1476	else
1477		tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
 
 
1478
1479	tipc_node_put(n);
1480
1481	return rc;
1482}
1483
1484/* tipc_node_xmit_skb(): send single buffer to destination
1485 * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
1486 * messages, which will not be rejected
1487 * The only exception is datagram messages rerouted after secondary
1488 * lookup, which are rare and safe to dispose of anyway.
 
 
1489 */
1490int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1491		       u32 selector)
1492{
1493	struct sk_buff_head head;
 
1494
1495	__skb_queue_head_init(&head);
1496	__skb_queue_tail(&head, skb);
1497	tipc_node_xmit(net, &head, dnode, selector);
1498	return 0;
1499}
1500
1501/* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1502 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1503 */
1504int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1505{
1506	struct sk_buff *skb;
1507	u32 selector, dnode;
1508
1509	while ((skb = __skb_dequeue(xmitq))) {
1510		selector = msg_origport(buf_msg(skb));
1511		dnode = msg_destnode(buf_msg(skb));
1512		tipc_node_xmit_skb(net, skb, dnode, selector);
1513	}
1514	return 0;
1515}
1516
1517void tipc_node_broadcast(struct net *net, struct sk_buff *skb)
1518{
1519	struct sk_buff *txskb;
1520	struct tipc_node *n;
1521	u32 dst;
1522
1523	rcu_read_lock();
1524	list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1525		dst = n->addr;
1526		if (in_own_node(net, dst))
1527			continue;
1528		if (!node_is_up(n))
1529			continue;
1530		txskb = pskb_copy(skb, GFP_ATOMIC);
1531		if (!txskb)
1532			break;
1533		msg_set_destnode(buf_msg(txskb), dst);
1534		tipc_node_xmit_skb(net, txskb, dst, 0);
1535	}
1536	rcu_read_unlock();
1537
1538	kfree_skb(skb);
1539}
1540
1541static void tipc_node_mcast_rcv(struct tipc_node *n)
1542{
1543	struct tipc_bclink_entry *be = &n->bc_entry;
1544
1545	/* 'arrvq' is under inputq2's lock protection */
1546	spin_lock_bh(&be->inputq2.lock);
1547	spin_lock_bh(&be->inputq1.lock);
1548	skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1549	spin_unlock_bh(&be->inputq1.lock);
1550	spin_unlock_bh(&be->inputq2.lock);
1551	tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1552}
1553
1554static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1555				  int bearer_id, struct sk_buff_head *xmitq)
1556{
1557	struct tipc_link *ucl;
1558	int rc;
1559
1560	rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr);
1561
1562	if (rc & TIPC_LINK_DOWN_EVT) {
1563		tipc_node_reset_links(n);
1564		return;
1565	}
1566
1567	if (!(rc & TIPC_LINK_SND_STATE))
1568		return;
1569
1570	/* If probe message, a STATE response will be sent anyway */
1571	if (msg_probe(hdr))
1572		return;
1573
1574	/* Produce a STATE message carrying broadcast NACK */
1575	tipc_node_read_lock(n);
1576	ucl = n->links[bearer_id].link;
1577	if (ucl)
1578		tipc_link_build_state_msg(ucl, xmitq);
1579	tipc_node_read_unlock(n);
1580}
1581
1582/**
1583 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1584 * @net: the applicable net namespace
1585 * @skb: TIPC packet
1586 * @bearer_id: id of bearer message arrived on
1587 *
1588 * Invoked with no locks held.
1589 */
1590static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1591{
1592	int rc;
1593	struct sk_buff_head xmitq;
1594	struct tipc_bclink_entry *be;
1595	struct tipc_link_entry *le;
1596	struct tipc_msg *hdr = buf_msg(skb);
1597	int usr = msg_user(hdr);
1598	u32 dnode = msg_destnode(hdr);
1599	struct tipc_node *n;
1600
1601	__skb_queue_head_init(&xmitq);
1602
1603	/* If NACK for other node, let rcv link for that node peek into it */
1604	if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1605		n = tipc_node_find(net, dnode);
1606	else
1607		n = tipc_node_find(net, msg_prevnode(hdr));
1608	if (!n) {
1609		kfree_skb(skb);
1610		return;
1611	}
1612	be = &n->bc_entry;
1613	le = &n->links[bearer_id];
1614
1615	rc = tipc_bcast_rcv(net, be->link, skb);
1616
 
 
 
 
1617	/* Broadcast ACKs are sent on a unicast link */
1618	if (rc & TIPC_LINK_SND_STATE) {
1619		tipc_node_read_lock(n);
1620		tipc_link_build_state_msg(le->link, &xmitq);
1621		tipc_node_read_unlock(n);
1622	}
1623
1624	if (!skb_queue_empty(&xmitq))
1625		tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1626
1627	if (!skb_queue_empty(&be->inputq1))
1628		tipc_node_mcast_rcv(n);
1629
1630	/* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
1631	if (!skb_queue_empty(&n->bc_entry.namedq))
1632		tipc_named_rcv(net, &n->bc_entry.namedq);
1633
1634	/* If reassembly or retransmission failure => reset all links to peer */
1635	if (rc & TIPC_LINK_DOWN_EVT)
1636		tipc_node_reset_links(n);
1637
1638	tipc_node_put(n);
1639}
1640
1641/**
1642 * tipc_node_check_state - check and if necessary update node state
1643 * @skb: TIPC packet
1644 * @bearer_id: identity of bearer delivering the packet
1645 * Returns true if state and msg are ok, otherwise false
1646 */
1647static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1648				  int bearer_id, struct sk_buff_head *xmitq)
1649{
1650	struct tipc_msg *hdr = buf_msg(skb);
1651	int usr = msg_user(hdr);
1652	int mtyp = msg_type(hdr);
1653	u16 oseqno = msg_seqno(hdr);
 
1654	u16 exp_pkts = msg_msgcnt(hdr);
1655	u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1656	int state = n->state;
1657	struct tipc_link *l, *tnl, *pl = NULL;
1658	struct tipc_media_addr *maddr;
1659	int pb_id;
1660
1661	if (trace_tipc_node_check_state_enabled()) {
1662		trace_tipc_skb_dump(skb, false, "skb for node state check");
1663		trace_tipc_node_check_state(n, true, " ");
1664	}
1665	l = n->links[bearer_id].link;
1666	if (!l)
1667		return false;
1668	rcv_nxt = tipc_link_rcv_nxt(l);
1669
1670
1671	if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1672		return true;
1673
1674	/* Find parallel link, if any */
1675	for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1676		if ((pb_id != bearer_id) && n->links[pb_id].link) {
1677			pl = n->links[pb_id].link;
1678			break;
1679		}
1680	}
1681
1682	if (!tipc_link_validate_msg(l, hdr)) {
1683		trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
1684		trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
1685		return false;
1686	}
1687
1688	/* Check and update node accesibility if applicable */
1689	if (state == SELF_UP_PEER_COMING) {
1690		if (!tipc_link_is_up(l))
1691			return true;
1692		if (!msg_peer_link_is_up(hdr))
1693			return true;
1694		tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1695	}
1696
1697	if (state == SELF_DOWN_PEER_LEAVING) {
1698		if (msg_peer_node_is_up(hdr))
1699			return false;
1700		tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1701		return true;
1702	}
1703
1704	if (state == SELF_LEAVING_PEER_DOWN)
1705		return false;
1706
1707	/* Ignore duplicate packets */
1708	if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1709		return true;
1710
1711	/* Initiate or update failover mode if applicable */
1712	if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1713		syncpt = oseqno + exp_pkts - 1;
1714		if (pl && !tipc_link_is_reset(pl)) {
1715			__tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1716			trace_tipc_node_link_down(n, true,
1717						  "node link down <- failover!");
1718			tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
1719							tipc_link_inputq(l));
1720		}
1721
1722		/* If parallel link was already down, and this happened before
1723		 * the tunnel link came up, node failover was never started.
1724		 * Ensure that a FAILOVER_MSG is sent to get peer out of
1725		 * NODE_FAILINGOVER state, also this node must accept
1726		 * TUNNEL_MSGs from peer.
1727		 */
1728		if (n->state != NODE_FAILINGOVER)
1729			tipc_node_link_failover(n, pl, l, xmitq);
1730
1731		/* If pkts arrive out of order, use lowest calculated syncpt */
1732		if (less(syncpt, n->sync_point))
1733			n->sync_point = syncpt;
1734	}
1735
1736	/* Open parallel link when tunnel link reaches synch point */
1737	if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
1738		if (!more(rcv_nxt, n->sync_point))
1739			return true;
1740		tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
1741		if (pl)
1742			tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
1743		return true;
1744	}
1745
1746	/* No synching needed if only one link */
1747	if (!pl || !tipc_link_is_up(pl))
1748		return true;
1749
1750	/* Initiate synch mode if applicable */
1751	if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
1752		if (n->capabilities & TIPC_TUNNEL_ENHANCED)
1753			syncpt = msg_syncpt(hdr);
1754		else
1755			syncpt = msg_seqno(msg_inner_hdr(hdr)) + exp_pkts - 1;
1756		if (!tipc_link_is_up(l))
1757			__tipc_node_link_up(n, bearer_id, xmitq);
 
1758		if (n->state == SELF_UP_PEER_UP) {
1759			n->sync_point = syncpt;
1760			tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
1761			tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
1762		}
1763	}
1764
1765	/* Open tunnel link when parallel link reaches synch point */
1766	if (n->state == NODE_SYNCHING) {
1767		if (tipc_link_is_synching(l)) {
1768			tnl = l;
1769		} else {
1770			tnl = pl;
1771			pl = l;
1772		}
1773		inputq_len = skb_queue_len(tipc_link_inputq(pl));
1774		dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
1775		if (more(dlv_nxt, n->sync_point)) {
1776			tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1777			tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1778			return true;
1779		}
1780		if (l == pl)
1781			return true;
1782		if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
1783			return true;
1784		if (usr == LINK_PROTOCOL)
1785			return true;
1786		return false;
1787	}
1788	return true;
1789}
1790
1791/**
1792 * tipc_rcv - process TIPC packets/messages arriving from off-node
1793 * @net: the applicable net namespace
1794 * @skb: TIPC packet
1795 * @bearer: pointer to bearer message arrived on
1796 *
1797 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1798 * structure (i.e. cannot be NULL), but bearer can be inactive.
1799 */
1800void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
1801{
1802	struct sk_buff_head xmitq;
1803	struct tipc_node *n;
1804	struct tipc_msg *hdr;
 
1805	int bearer_id = b->identity;
1806	struct tipc_link_entry *le;
 
1807	u32 self = tipc_own_addr(net);
1808	int usr, rc = 0;
1809	u16 bc_ack;
1810
1811	__skb_queue_head_init(&xmitq);
1812
1813	/* Ensure message is well-formed before touching the header */
1814	TIPC_SKB_CB(skb)->validated = false;
1815	if (unlikely(!tipc_msg_validate(&skb)))
1816		goto discard;
1817	hdr = buf_msg(skb);
1818	usr = msg_user(hdr);
1819	bc_ack = msg_bcast_ack(hdr);
1820
1821	/* Handle arrival of discovery or broadcast packet */
1822	if (unlikely(msg_non_seq(hdr))) {
1823		if (unlikely(usr == LINK_CONFIG))
1824			return tipc_disc_rcv(net, skb, b);
1825		else
1826			return tipc_node_bc_rcv(net, skb, bearer_id);
1827	}
1828
1829	/* Discard unicast link messages destined for another node */
1830	if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
1831		goto discard;
1832
1833	/* Locate neighboring node that sent packet */
1834	n = tipc_node_find(net, msg_prevnode(hdr));
1835	if (unlikely(!n))
1836		goto discard;
1837	le = &n->links[bearer_id];
1838
1839	/* Ensure broadcast reception is in synch with peer's send state */
1840	if (unlikely(usr == LINK_PROTOCOL))
1841		tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
1842	else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack))
1843		tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
1844
1845	/* Receive packet directly if conditions permit */
1846	tipc_node_read_lock(n);
1847	if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
1848		spin_lock_bh(&le->lock);
1849		if (le->link) {
1850			rc = tipc_link_rcv(le->link, skb, &xmitq);
1851			skb = NULL;
1852		}
1853		spin_unlock_bh(&le->lock);
1854	}
1855	tipc_node_read_unlock(n);
1856
1857	/* Check/update node state before receiving */
1858	if (unlikely(skb)) {
1859		if (unlikely(skb_linearize(skb)))
1860			goto discard;
1861		tipc_node_write_lock(n);
1862		if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
1863			if (le->link) {
1864				rc = tipc_link_rcv(le->link, skb, &xmitq);
1865				skb = NULL;
1866			}
1867		}
1868		tipc_node_write_unlock(n);
1869	}
1870
1871	if (unlikely(rc & TIPC_LINK_UP_EVT))
1872		tipc_node_link_up(n, bearer_id, &xmitq);
1873
1874	if (unlikely(rc & TIPC_LINK_DOWN_EVT))
1875		tipc_node_link_down(n, bearer_id, false);
1876
1877	if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
1878		tipc_named_rcv(net, &n->bc_entry.namedq);
1879
1880	if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
1881		tipc_node_mcast_rcv(n);
1882
1883	if (!skb_queue_empty(&le->inputq))
1884		tipc_sk_rcv(net, &le->inputq);
1885
1886	if (!skb_queue_empty(&xmitq))
1887		tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1888
1889	tipc_node_put(n);
1890discard:
1891	kfree_skb(skb);
1892}
1893
1894void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
1895			      int prop)
1896{
1897	struct tipc_net *tn = tipc_net(net);
1898	int bearer_id = b->identity;
1899	struct sk_buff_head xmitq;
1900	struct tipc_link_entry *e;
1901	struct tipc_node *n;
1902
1903	__skb_queue_head_init(&xmitq);
1904
1905	rcu_read_lock();
1906
1907	list_for_each_entry_rcu(n, &tn->node_list, list) {
1908		tipc_node_write_lock(n);
1909		e = &n->links[bearer_id];
1910		if (e->link) {
1911			if (prop == TIPC_NLA_PROP_TOL)
1912				tipc_link_set_tolerance(e->link, b->tolerance,
1913							&xmitq);
1914			else if (prop == TIPC_NLA_PROP_MTU)
1915				tipc_link_set_mtu(e->link, b->mtu);
1916		}
1917		tipc_node_write_unlock(n);
1918		tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr);
1919	}
1920
1921	rcu_read_unlock();
1922}
1923
1924int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
1925{
1926	struct net *net = sock_net(skb->sk);
1927	struct tipc_net *tn = net_generic(net, tipc_net_id);
1928	struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
1929	struct tipc_node *peer;
1930	u32 addr;
1931	int err;
1932
1933	/* We identify the peer by its net */
1934	if (!info->attrs[TIPC_NLA_NET])
1935		return -EINVAL;
1936
1937	err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
1938					  info->attrs[TIPC_NLA_NET],
1939					  tipc_nl_net_policy, info->extack);
1940	if (err)
1941		return err;
1942
1943	if (!attrs[TIPC_NLA_NET_ADDR])
1944		return -EINVAL;
1945
1946	addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
1947
1948	if (in_own_node(net, addr))
1949		return -ENOTSUPP;
1950
1951	spin_lock_bh(&tn->node_list_lock);
1952	peer = tipc_node_find(net, addr);
1953	if (!peer) {
1954		spin_unlock_bh(&tn->node_list_lock);
1955		return -ENXIO;
1956	}
1957
1958	tipc_node_write_lock(peer);
1959	if (peer->state != SELF_DOWN_PEER_DOWN &&
1960	    peer->state != SELF_DOWN_PEER_LEAVING) {
1961		tipc_node_write_unlock(peer);
1962		err = -EBUSY;
1963		goto err_out;
1964	}
1965
1966	tipc_node_clear_links(peer);
1967	tipc_node_write_unlock(peer);
1968	tipc_node_delete(peer);
1969
1970	err = 0;
1971err_out:
1972	tipc_node_put(peer);
1973	spin_unlock_bh(&tn->node_list_lock);
1974
1975	return err;
1976}
1977
1978int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
1979{
1980	int err;
1981	struct net *net = sock_net(skb->sk);
1982	struct tipc_net *tn = net_generic(net, tipc_net_id);
1983	int done = cb->args[0];
1984	int last_addr = cb->args[1];
1985	struct tipc_node *node;
1986	struct tipc_nl_msg msg;
1987
1988	if (done)
1989		return 0;
1990
1991	msg.skb = skb;
1992	msg.portid = NETLINK_CB(cb->skb).portid;
1993	msg.seq = cb->nlh->nlmsg_seq;
1994
1995	rcu_read_lock();
1996	if (last_addr) {
1997		node = tipc_node_find(net, last_addr);
1998		if (!node) {
1999			rcu_read_unlock();
2000			/* We never set seq or call nl_dump_check_consistent()
2001			 * this means that setting prev_seq here will cause the
2002			 * consistence check to fail in the netlink callback
2003			 * handler. Resulting in the NLMSG_DONE message having
2004			 * the NLM_F_DUMP_INTR flag set if the node state
2005			 * changed while we released the lock.
2006			 */
2007			cb->prev_seq = 1;
2008			return -EPIPE;
2009		}
2010		tipc_node_put(node);
2011	}
2012
2013	list_for_each_entry_rcu(node, &tn->node_list, list) {
2014		if (last_addr) {
2015			if (node->addr == last_addr)
2016				last_addr = 0;
2017			else
2018				continue;
2019		}
2020
2021		tipc_node_read_lock(node);
2022		err = __tipc_nl_add_node(&msg, node);
2023		if (err) {
2024			last_addr = node->addr;
2025			tipc_node_read_unlock(node);
2026			goto out;
2027		}
2028
2029		tipc_node_read_unlock(node);
2030	}
2031	done = 1;
2032out:
2033	cb->args[0] = done;
2034	cb->args[1] = last_addr;
2035	rcu_read_unlock();
2036
2037	return skb->len;
2038}
2039
2040/* tipc_node_find_by_name - locate owner node of link by link's name
2041 * @net: the applicable net namespace
2042 * @name: pointer to link name string
2043 * @bearer_id: pointer to index in 'node->links' array where the link was found.
2044 *
2045 * Returns pointer to node owning the link, or 0 if no matching link is found.
2046 */
2047static struct tipc_node *tipc_node_find_by_name(struct net *net,
2048						const char *link_name,
2049						unsigned int *bearer_id)
2050{
2051	struct tipc_net *tn = net_generic(net, tipc_net_id);
2052	struct tipc_link *l;
2053	struct tipc_node *n;
2054	struct tipc_node *found_node = NULL;
2055	int i;
2056
2057	*bearer_id = 0;
2058	rcu_read_lock();
2059	list_for_each_entry_rcu(n, &tn->node_list, list) {
2060		tipc_node_read_lock(n);
2061		for (i = 0; i < MAX_BEARERS; i++) {
2062			l = n->links[i].link;
2063			if (l && !strcmp(tipc_link_name(l), link_name)) {
2064				*bearer_id = i;
2065				found_node = n;
2066				break;
2067			}
2068		}
2069		tipc_node_read_unlock(n);
2070		if (found_node)
2071			break;
2072	}
2073	rcu_read_unlock();
2074
2075	return found_node;
2076}
2077
2078int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
2079{
2080	int err;
2081	int res = 0;
2082	int bearer_id;
2083	char *name;
2084	struct tipc_link *link;
2085	struct tipc_node *node;
2086	struct sk_buff_head xmitq;
2087	struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2088	struct net *net = sock_net(skb->sk);
2089
2090	__skb_queue_head_init(&xmitq);
2091
2092	if (!info->attrs[TIPC_NLA_LINK])
2093		return -EINVAL;
2094
2095	err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2096					  info->attrs[TIPC_NLA_LINK],
2097					  tipc_nl_link_policy, info->extack);
2098	if (err)
2099		return err;
2100
2101	if (!attrs[TIPC_NLA_LINK_NAME])
2102		return -EINVAL;
2103
2104	name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2105
2106	if (strcmp(name, tipc_bclink_name) == 0)
2107		return tipc_nl_bc_link_set(net, attrs);
2108
2109	node = tipc_node_find_by_name(net, name, &bearer_id);
2110	if (!node)
2111		return -EINVAL;
2112
2113	tipc_node_read_lock(node);
2114
2115	link = node->links[bearer_id].link;
2116	if (!link) {
2117		res = -EINVAL;
2118		goto out;
2119	}
2120
2121	if (attrs[TIPC_NLA_LINK_PROP]) {
2122		struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2123
2124		err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
2125					      props);
2126		if (err) {
2127			res = err;
2128			goto out;
2129		}
2130
2131		if (props[TIPC_NLA_PROP_TOL]) {
2132			u32 tol;
2133
2134			tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2135			tipc_link_set_tolerance(link, tol, &xmitq);
2136		}
2137		if (props[TIPC_NLA_PROP_PRIO]) {
2138			u32 prio;
2139
2140			prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2141			tipc_link_set_prio(link, prio, &xmitq);
2142		}
2143		if (props[TIPC_NLA_PROP_WIN]) {
2144			u32 win;
2145
2146			win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2147			tipc_link_set_queue_limits(link, win);
2148		}
2149	}
2150
2151out:
2152	tipc_node_read_unlock(node);
2153	tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr);
2154	return res;
2155}
2156
2157int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
2158{
2159	struct net *net = genl_info_net(info);
2160	struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2161	struct tipc_nl_msg msg;
2162	char *name;
2163	int err;
2164
2165	msg.portid = info->snd_portid;
2166	msg.seq = info->snd_seq;
2167
2168	if (!info->attrs[TIPC_NLA_LINK])
2169		return -EINVAL;
2170
2171	err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2172					  info->attrs[TIPC_NLA_LINK],
2173					  tipc_nl_link_policy, info->extack);
2174	if (err)
2175		return err;
2176
2177	if (!attrs[TIPC_NLA_LINK_NAME])
2178		return -EINVAL;
2179
2180	name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2181
2182	msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2183	if (!msg.skb)
2184		return -ENOMEM;
2185
2186	if (strcmp(name, tipc_bclink_name) == 0) {
2187		err = tipc_nl_add_bc_link(net, &msg);
2188		if (err)
2189			goto err_free;
 
 
2190	} else {
2191		int bearer_id;
2192		struct tipc_node *node;
2193		struct tipc_link *link;
2194
2195		node = tipc_node_find_by_name(net, name, &bearer_id);
2196		if (!node) {
2197			err = -EINVAL;
2198			goto err_free;
2199		}
2200
2201		tipc_node_read_lock(node);
2202		link = node->links[bearer_id].link;
2203		if (!link) {
2204			tipc_node_read_unlock(node);
2205			err = -EINVAL;
2206			goto err_free;
2207		}
2208
2209		err = __tipc_nl_add_link(net, &msg, link, 0);
2210		tipc_node_read_unlock(node);
2211		if (err)
2212			goto err_free;
 
 
2213	}
2214
2215	return genlmsg_reply(msg.skb, info);
2216
2217err_free:
2218	nlmsg_free(msg.skb);
2219	return err;
2220}
2221
2222int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2223{
2224	int err;
2225	char *link_name;
2226	unsigned int bearer_id;
2227	struct tipc_link *link;
2228	struct tipc_node *node;
2229	struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2230	struct net *net = sock_net(skb->sk);
2231	struct tipc_link_entry *le;
2232
2233	if (!info->attrs[TIPC_NLA_LINK])
2234		return -EINVAL;
2235
2236	err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2237					  info->attrs[TIPC_NLA_LINK],
2238					  tipc_nl_link_policy, info->extack);
2239	if (err)
2240		return err;
2241
2242	if (!attrs[TIPC_NLA_LINK_NAME])
2243		return -EINVAL;
2244
2245	link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2246
2247	if (strcmp(link_name, tipc_bclink_name) == 0) {
2248		err = tipc_bclink_reset_stats(net);
2249		if (err)
2250			return err;
2251		return 0;
2252	}
2253
2254	node = tipc_node_find_by_name(net, link_name, &bearer_id);
2255	if (!node)
2256		return -EINVAL;
2257
2258	le = &node->links[bearer_id];
2259	tipc_node_read_lock(node);
2260	spin_lock_bh(&le->lock);
2261	link = node->links[bearer_id].link;
2262	if (!link) {
2263		spin_unlock_bh(&le->lock);
2264		tipc_node_read_unlock(node);
2265		return -EINVAL;
2266	}
2267	tipc_link_reset_stats(link);
2268	spin_unlock_bh(&le->lock);
2269	tipc_node_read_unlock(node);
2270	return 0;
2271}
2272
2273/* Caller should hold node lock  */
2274static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2275				    struct tipc_node *node, u32 *prev_link)
2276{
2277	u32 i;
2278	int err;
2279
2280	for (i = *prev_link; i < MAX_BEARERS; i++) {
2281		*prev_link = i;
2282
2283		if (!node->links[i].link)
2284			continue;
2285
2286		err = __tipc_nl_add_link(net, msg,
2287					 node->links[i].link, NLM_F_MULTI);
2288		if (err)
2289			return err;
2290	}
2291	*prev_link = 0;
2292
2293	return 0;
2294}
2295
2296int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2297{
2298	struct net *net = sock_net(skb->sk);
2299	struct tipc_net *tn = net_generic(net, tipc_net_id);
2300	struct tipc_node *node;
2301	struct tipc_nl_msg msg;
2302	u32 prev_node = cb->args[0];
2303	u32 prev_link = cb->args[1];
2304	int done = cb->args[2];
2305	int err;
2306
2307	if (done)
2308		return 0;
2309
2310	msg.skb = skb;
2311	msg.portid = NETLINK_CB(cb->skb).portid;
2312	msg.seq = cb->nlh->nlmsg_seq;
2313
2314	rcu_read_lock();
2315	if (prev_node) {
2316		node = tipc_node_find(net, prev_node);
2317		if (!node) {
2318			/* We never set seq or call nl_dump_check_consistent()
2319			 * this means that setting prev_seq here will cause the
2320			 * consistence check to fail in the netlink callback
2321			 * handler. Resulting in the last NLMSG_DONE message
2322			 * having the NLM_F_DUMP_INTR flag set.
2323			 */
2324			cb->prev_seq = 1;
2325			goto out;
2326		}
2327		tipc_node_put(node);
2328
2329		list_for_each_entry_continue_rcu(node, &tn->node_list,
2330						 list) {
2331			tipc_node_read_lock(node);
2332			err = __tipc_nl_add_node_links(net, &msg, node,
2333						       &prev_link);
2334			tipc_node_read_unlock(node);
2335			if (err)
2336				goto out;
2337
2338			prev_node = node->addr;
2339		}
2340	} else {
2341		err = tipc_nl_add_bc_link(net, &msg);
2342		if (err)
2343			goto out;
2344
2345		list_for_each_entry_rcu(node, &tn->node_list, list) {
2346			tipc_node_read_lock(node);
2347			err = __tipc_nl_add_node_links(net, &msg, node,
2348						       &prev_link);
2349			tipc_node_read_unlock(node);
2350			if (err)
2351				goto out;
2352
2353			prev_node = node->addr;
2354		}
2355	}
2356	done = 1;
2357out:
2358	rcu_read_unlock();
2359
2360	cb->args[0] = prev_node;
2361	cb->args[1] = prev_link;
2362	cb->args[2] = done;
2363
2364	return skb->len;
2365}
2366
2367int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2368{
2369	struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2370	struct net *net = sock_net(skb->sk);
2371	int err;
2372
2373	if (!info->attrs[TIPC_NLA_MON])
2374		return -EINVAL;
2375
2376	err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
2377					  info->attrs[TIPC_NLA_MON],
2378					  tipc_nl_monitor_policy,
2379					  info->extack);
2380	if (err)
2381		return err;
2382
2383	if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2384		u32 val;
2385
2386		val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2387		err = tipc_nl_monitor_set_threshold(net, val);
2388		if (err)
2389			return err;
2390	}
2391
2392	return 0;
2393}
2394
2395static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2396{
2397	struct nlattr *attrs;
2398	void *hdr;
2399	u32 val;
2400
2401	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2402			  0, TIPC_NL_MON_GET);
2403	if (!hdr)
2404		return -EMSGSIZE;
2405
2406	attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
2407	if (!attrs)
2408		goto msg_full;
2409
2410	val = tipc_nl_monitor_get_threshold(net);
2411
2412	if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2413		goto attr_msg_full;
2414
2415	nla_nest_end(msg->skb, attrs);
2416	genlmsg_end(msg->skb, hdr);
2417
2418	return 0;
2419
2420attr_msg_full:
2421	nla_nest_cancel(msg->skb, attrs);
2422msg_full:
2423	genlmsg_cancel(msg->skb, hdr);
2424
2425	return -EMSGSIZE;
2426}
2427
2428int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2429{
2430	struct net *net = sock_net(skb->sk);
2431	struct tipc_nl_msg msg;
2432	int err;
2433
2434	msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2435	if (!msg.skb)
2436		return -ENOMEM;
2437	msg.portid = info->snd_portid;
2438	msg.seq = info->snd_seq;
2439
2440	err = __tipc_nl_add_monitor_prop(net, &msg);
2441	if (err) {
2442		nlmsg_free(msg.skb);
2443		return err;
2444	}
2445
2446	return genlmsg_reply(msg.skb, info);
2447}
2448
2449int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2450{
2451	struct net *net = sock_net(skb->sk);
2452	u32 prev_bearer = cb->args[0];
2453	struct tipc_nl_msg msg;
2454	int bearer_id;
2455	int err;
2456
2457	if (prev_bearer == MAX_BEARERS)
2458		return 0;
2459
2460	msg.skb = skb;
2461	msg.portid = NETLINK_CB(cb->skb).portid;
2462	msg.seq = cb->nlh->nlmsg_seq;
2463
2464	rtnl_lock();
2465	for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2466		err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2467		if (err)
2468			break;
2469	}
2470	rtnl_unlock();
2471	cb->args[0] = bearer_id;
2472
2473	return skb->len;
2474}
2475
2476int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2477				   struct netlink_callback *cb)
2478{
2479	struct net *net = sock_net(skb->sk);
2480	u32 prev_node = cb->args[1];
2481	u32 bearer_id = cb->args[2];
2482	int done = cb->args[0];
2483	struct tipc_nl_msg msg;
2484	int err;
2485
2486	if (!prev_node) {
2487		struct nlattr **attrs;
2488		struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2489
2490		err = tipc_nlmsg_parse(cb->nlh, &attrs);
2491		if (err)
2492			return err;
2493
2494		if (!attrs[TIPC_NLA_MON])
2495			return -EINVAL;
2496
2497		err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
2498						  attrs[TIPC_NLA_MON],
2499						  tipc_nl_monitor_policy,
2500						  NULL);
2501		if (err)
2502			return err;
2503
2504		if (!mon[TIPC_NLA_MON_REF])
2505			return -EINVAL;
2506
2507		bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2508
2509		if (bearer_id >= MAX_BEARERS)
2510			return -EINVAL;
2511	}
2512
2513	if (done)
2514		return 0;
2515
2516	msg.skb = skb;
2517	msg.portid = NETLINK_CB(cb->skb).portid;
2518	msg.seq = cb->nlh->nlmsg_seq;
2519
2520	rtnl_lock();
2521	err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2522	if (!err)
2523		done = 1;
2524
2525	rtnl_unlock();
2526	cb->args[0] = done;
2527	cb->args[1] = prev_node;
2528	cb->args[2] = bearer_id;
2529
2530	return skb->len;
2531}
2532
2533u32 tipc_node_get_addr(struct tipc_node *node)
2534{
2535	return (node) ? node->addr : 0;
2536}
2537
2538/**
2539 * tipc_node_dump - dump TIPC node data
2540 * @n: tipc node to be dumped
2541 * @more: dump more?
2542 *        - false: dump only tipc node data
2543 *        - true: dump node link data as well
2544 * @buf: returned buffer of dump data in format
2545 */
2546int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
2547{
2548	int i = 0;
2549	size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
2550
2551	if (!n) {
2552		i += scnprintf(buf, sz, "node data: (null)\n");
2553		return i;
2554	}
2555
2556	i += scnprintf(buf, sz, "node data: %x", n->addr);
2557	i += scnprintf(buf + i, sz - i, " %x", n->state);
2558	i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
2559	i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
2560	i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
2561	i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
2562	i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
2563	i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
2564	i += scnprintf(buf + i, sz - i, " %u", n->working_links);
2565	i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
2566	i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
2567
2568	if (!more)
2569		return i;
2570
2571	i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
2572	i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
2573	i += scnprintf(buf + i, sz - i, " media: ");
2574	i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
2575	i += scnprintf(buf + i, sz - i, "\n");
2576	i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
2577	i += scnprintf(buf + i, sz - i, " inputq: ");
2578	i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
2579
2580	i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
2581	i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
2582	i += scnprintf(buf + i, sz - i, " media: ");
2583	i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
2584	i += scnprintf(buf + i, sz - i, "\n");
2585	i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
2586	i += scnprintf(buf + i, sz - i, " inputq: ");
2587	i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
2588
2589	i += scnprintf(buf + i, sz - i, "bclink:\n ");
2590	i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
2591
2592	return i;
2593}