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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#include "crypto.h"
48
49#define INVALID_NODE_SIG 0x10000
50#define NODE_CLEANUP_AFTER 300000
51
52/* Flags used to take different actions according to flag type
53 * TIPC_NOTIFY_NODE_DOWN: notify node is down
54 * TIPC_NOTIFY_NODE_UP: notify node is up
55 * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
56 */
57enum {
58 TIPC_NOTIFY_NODE_DOWN = (1 << 3),
59 TIPC_NOTIFY_NODE_UP = (1 << 4),
60 TIPC_NOTIFY_LINK_UP = (1 << 6),
61 TIPC_NOTIFY_LINK_DOWN = (1 << 7)
62};
63
64struct tipc_link_entry {
65 struct tipc_link *link;
66 spinlock_t lock; /* per link */
67 u32 mtu;
68 struct sk_buff_head inputq;
69 struct tipc_media_addr maddr;
70};
71
72struct tipc_bclink_entry {
73 struct tipc_link *link;
74 struct sk_buff_head inputq1;
75 struct sk_buff_head arrvq;
76 struct sk_buff_head inputq2;
77 struct sk_buff_head namedq;
78 u16 named_rcv_nxt;
79 bool named_open;
80};
81
82/**
83 * struct tipc_node - TIPC node structure
84 * @addr: network address of node
85 * @kref: reference counter to node object
86 * @lock: rwlock governing access to structure
87 * @net: the applicable net namespace
88 * @hash: links to adjacent nodes in unsorted hash chain
89 * @inputq: pointer to input queue containing messages for msg event
90 * @namedq: pointer to name table input queue with name table messages
91 * @active_links: bearer ids of active links, used as index into links[] array
92 * @links: array containing references to all links to node
93 * @bc_entry: broadcast link entry
94 * @action_flags: bit mask of different types of node actions
95 * @state: connectivity state vs peer node
96 * @preliminary: a preliminary node or not
97 * @failover_sent: failover sent or not
98 * @sync_point: sequence number where synch/failover is finished
99 * @list: links to adjacent nodes in sorted list of cluster's nodes
100 * @working_links: number of working links to node (both active and standby)
101 * @link_cnt: number of links to node
102 * @capabilities: bitmap, indicating peer node's functional capabilities
103 * @signature: node instance identifier
104 * @link_id: local and remote bearer ids of changing link, if any
105 * @peer_id: 128-bit ID of peer
106 * @peer_id_string: ID string of peer
107 * @publ_list: list of publications
108 * @conn_sks: list of connections (FIXME)
109 * @timer: node's keepalive timer
110 * @keepalive_intv: keepalive interval in milliseconds
111 * @rcu: rcu struct for tipc_node
112 * @delete_at: indicates the time for deleting a down node
113 * @peer_net: peer's net namespace
114 * @peer_hash_mix: hash for this peer (FIXME)
115 * @crypto_rx: RX crypto handler
116 */
117struct tipc_node {
118 u32 addr;
119 struct kref kref;
120 rwlock_t lock;
121 struct net *net;
122 struct hlist_node hash;
123 int active_links[2];
124 struct tipc_link_entry links[MAX_BEARERS];
125 struct tipc_bclink_entry bc_entry;
126 int action_flags;
127 struct list_head list;
128 int state;
129 bool preliminary;
130 bool failover_sent;
131 u16 sync_point;
132 int link_cnt;
133 u16 working_links;
134 u16 capabilities;
135 u32 signature;
136 u32 link_id;
137 u8 peer_id[16];
138 char peer_id_string[NODE_ID_STR_LEN];
139 struct list_head publ_list;
140 struct list_head conn_sks;
141 unsigned long keepalive_intv;
142 struct timer_list timer;
143 struct rcu_head rcu;
144 unsigned long delete_at;
145 struct net *peer_net;
146 u32 peer_hash_mix;
147#ifdef CONFIG_TIPC_CRYPTO
148 struct tipc_crypto *crypto_rx;
149#endif
150};
151
152/* Node FSM states and events:
153 */
154enum {
155 SELF_DOWN_PEER_DOWN = 0xdd,
156 SELF_UP_PEER_UP = 0xaa,
157 SELF_DOWN_PEER_LEAVING = 0xd1,
158 SELF_UP_PEER_COMING = 0xac,
159 SELF_COMING_PEER_UP = 0xca,
160 SELF_LEAVING_PEER_DOWN = 0x1d,
161 NODE_FAILINGOVER = 0xf0,
162 NODE_SYNCHING = 0xcc
163};
164
165enum {
166 SELF_ESTABL_CONTACT_EVT = 0xece,
167 SELF_LOST_CONTACT_EVT = 0x1ce,
168 PEER_ESTABL_CONTACT_EVT = 0x9ece,
169 PEER_LOST_CONTACT_EVT = 0x91ce,
170 NODE_FAILOVER_BEGIN_EVT = 0xfbe,
171 NODE_FAILOVER_END_EVT = 0xfee,
172 NODE_SYNCH_BEGIN_EVT = 0xcbe,
173 NODE_SYNCH_END_EVT = 0xcee
174};
175
176static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
177 struct sk_buff_head *xmitq,
178 struct tipc_media_addr **maddr);
179static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
180 bool delete);
181static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
182static void tipc_node_delete(struct tipc_node *node);
183static void tipc_node_timeout(struct timer_list *t);
184static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
185static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
186static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
187static bool node_is_up(struct tipc_node *n);
188static void tipc_node_delete_from_list(struct tipc_node *node);
189
190struct tipc_sock_conn {
191 u32 port;
192 u32 peer_port;
193 u32 peer_node;
194 struct list_head list;
195};
196
197static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
198{
199 int bearer_id = n->active_links[sel & 1];
200
201 if (unlikely(bearer_id == INVALID_BEARER_ID))
202 return NULL;
203
204 return n->links[bearer_id].link;
205}
206
207int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel, bool connected)
208{
209 struct tipc_node *n;
210 int bearer_id;
211 unsigned int mtu = MAX_MSG_SIZE;
212
213 n = tipc_node_find(net, addr);
214 if (unlikely(!n))
215 return mtu;
216
217 /* Allow MAX_MSG_SIZE when building connection oriented message
218 * if they are in the same core network
219 */
220 if (n->peer_net && connected) {
221 tipc_node_put(n);
222 return mtu;
223 }
224
225 bearer_id = n->active_links[sel & 1];
226 if (likely(bearer_id != INVALID_BEARER_ID))
227 mtu = n->links[bearer_id].mtu;
228 tipc_node_put(n);
229 return mtu;
230}
231
232bool tipc_node_get_id(struct net *net, u32 addr, u8 *id)
233{
234 u8 *own_id = tipc_own_id(net);
235 struct tipc_node *n;
236
237 if (!own_id)
238 return true;
239
240 if (addr == tipc_own_addr(net)) {
241 memcpy(id, own_id, TIPC_NODEID_LEN);
242 return true;
243 }
244 n = tipc_node_find(net, addr);
245 if (!n)
246 return false;
247
248 memcpy(id, &n->peer_id, TIPC_NODEID_LEN);
249 tipc_node_put(n);
250 return true;
251}
252
253u16 tipc_node_get_capabilities(struct net *net, u32 addr)
254{
255 struct tipc_node *n;
256 u16 caps;
257
258 n = tipc_node_find(net, addr);
259 if (unlikely(!n))
260 return TIPC_NODE_CAPABILITIES;
261 caps = n->capabilities;
262 tipc_node_put(n);
263 return caps;
264}
265
266u32 tipc_node_get_addr(struct tipc_node *node)
267{
268 return (node) ? node->addr : 0;
269}
270
271char *tipc_node_get_id_str(struct tipc_node *node)
272{
273 return node->peer_id_string;
274}
275
276#ifdef CONFIG_TIPC_CRYPTO
277/**
278 * tipc_node_crypto_rx - Retrieve crypto RX handle from node
279 * @__n: target tipc_node
280 * Note: node ref counter must be held first!
281 */
282struct tipc_crypto *tipc_node_crypto_rx(struct tipc_node *__n)
283{
284 return (__n) ? __n->crypto_rx : NULL;
285}
286
287struct tipc_crypto *tipc_node_crypto_rx_by_list(struct list_head *pos)
288{
289 return container_of(pos, struct tipc_node, list)->crypto_rx;
290}
291
292struct tipc_crypto *tipc_node_crypto_rx_by_addr(struct net *net, u32 addr)
293{
294 struct tipc_node *n;
295
296 n = tipc_node_find(net, addr);
297 return (n) ? n->crypto_rx : NULL;
298}
299#endif
300
301static void tipc_node_free(struct rcu_head *rp)
302{
303 struct tipc_node *n = container_of(rp, struct tipc_node, rcu);
304
305#ifdef CONFIG_TIPC_CRYPTO
306 tipc_crypto_stop(&n->crypto_rx);
307#endif
308 kfree(n);
309}
310
311static void tipc_node_kref_release(struct kref *kref)
312{
313 struct tipc_node *n = container_of(kref, struct tipc_node, kref);
314
315 kfree(n->bc_entry.link);
316 call_rcu(&n->rcu, tipc_node_free);
317}
318
319void tipc_node_put(struct tipc_node *node)
320{
321 kref_put(&node->kref, tipc_node_kref_release);
322}
323
324void tipc_node_get(struct tipc_node *node)
325{
326 kref_get(&node->kref);
327}
328
329/*
330 * tipc_node_find - locate specified node object, if it exists
331 */
332static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
333{
334 struct tipc_net *tn = tipc_net(net);
335 struct tipc_node *node;
336 unsigned int thash = tipc_hashfn(addr);
337
338 rcu_read_lock();
339 hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
340 if (node->addr != addr || node->preliminary)
341 continue;
342 if (!kref_get_unless_zero(&node->kref))
343 node = NULL;
344 break;
345 }
346 rcu_read_unlock();
347 return node;
348}
349
350/* tipc_node_find_by_id - locate specified node object by its 128-bit id
351 * Note: this function is called only when a discovery request failed
352 * to find the node by its 32-bit id, and is not time critical
353 */
354static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id)
355{
356 struct tipc_net *tn = tipc_net(net);
357 struct tipc_node *n;
358 bool found = false;
359
360 rcu_read_lock();
361 list_for_each_entry_rcu(n, &tn->node_list, list) {
362 read_lock_bh(&n->lock);
363 if (!memcmp(id, n->peer_id, 16) &&
364 kref_get_unless_zero(&n->kref))
365 found = true;
366 read_unlock_bh(&n->lock);
367 if (found)
368 break;
369 }
370 rcu_read_unlock();
371 return found ? n : NULL;
372}
373
374static void tipc_node_read_lock(struct tipc_node *n)
375 __acquires(n->lock)
376{
377 read_lock_bh(&n->lock);
378}
379
380static void tipc_node_read_unlock(struct tipc_node *n)
381 __releases(n->lock)
382{
383 read_unlock_bh(&n->lock);
384}
385
386static void tipc_node_write_lock(struct tipc_node *n)
387 __acquires(n->lock)
388{
389 write_lock_bh(&n->lock);
390}
391
392static void tipc_node_write_unlock_fast(struct tipc_node *n)
393 __releases(n->lock)
394{
395 write_unlock_bh(&n->lock);
396}
397
398static void tipc_node_write_unlock(struct tipc_node *n)
399 __releases(n->lock)
400{
401 struct tipc_socket_addr sk;
402 struct net *net = n->net;
403 u32 flags = n->action_flags;
404 struct list_head *publ_list;
405 struct tipc_uaddr ua;
406 u32 bearer_id;
407
408 if (likely(!flags)) {
409 write_unlock_bh(&n->lock);
410 return;
411 }
412
413 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_NODE_SCOPE,
414 TIPC_LINK_STATE, n->addr, n->addr);
415 sk.ref = n->link_id;
416 sk.node = n->addr;
417 bearer_id = n->link_id & 0xffff;
418 publ_list = &n->publ_list;
419
420 n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
421 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
422
423 write_unlock_bh(&n->lock);
424
425 if (flags & TIPC_NOTIFY_NODE_DOWN)
426 tipc_publ_notify(net, publ_list, sk.node, n->capabilities);
427
428 if (flags & TIPC_NOTIFY_NODE_UP)
429 tipc_named_node_up(net, sk.node, n->capabilities);
430
431 if (flags & TIPC_NOTIFY_LINK_UP) {
432 tipc_mon_peer_up(net, sk.node, bearer_id);
433 tipc_nametbl_publish(net, &ua, &sk, sk.ref);
434 }
435 if (flags & TIPC_NOTIFY_LINK_DOWN) {
436 tipc_mon_peer_down(net, sk.node, bearer_id);
437 tipc_nametbl_withdraw(net, &ua, &sk, sk.ref);
438 }
439}
440
441static void tipc_node_assign_peer_net(struct tipc_node *n, u32 hash_mixes)
442{
443 int net_id = tipc_netid(n->net);
444 struct tipc_net *tn_peer;
445 struct net *tmp;
446 u32 hash_chk;
447
448 if (n->peer_net)
449 return;
450
451 for_each_net_rcu(tmp) {
452 tn_peer = tipc_net(tmp);
453 if (!tn_peer)
454 continue;
455 /* Integrity checking whether node exists in namespace or not */
456 if (tn_peer->net_id != net_id)
457 continue;
458 if (memcmp(n->peer_id, tn_peer->node_id, NODE_ID_LEN))
459 continue;
460 hash_chk = tipc_net_hash_mixes(tmp, tn_peer->random);
461 if (hash_mixes ^ hash_chk)
462 continue;
463 n->peer_net = tmp;
464 n->peer_hash_mix = hash_mixes;
465 break;
466 }
467}
468
469struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
470 u16 capabilities, u32 hash_mixes,
471 bool preliminary)
472{
473 struct tipc_net *tn = net_generic(net, tipc_net_id);
474 struct tipc_node *n, *temp_node;
475 struct tipc_link *l;
476 unsigned long intv;
477 int bearer_id;
478 int i;
479
480 spin_lock_bh(&tn->node_list_lock);
481 n = tipc_node_find(net, addr) ?:
482 tipc_node_find_by_id(net, peer_id);
483 if (n) {
484 if (!n->preliminary)
485 goto update;
486 if (preliminary)
487 goto exit;
488 /* A preliminary node becomes "real" now, refresh its data */
489 tipc_node_write_lock(n);
490 n->preliminary = false;
491 n->addr = addr;
492 hlist_del_rcu(&n->hash);
493 hlist_add_head_rcu(&n->hash,
494 &tn->node_htable[tipc_hashfn(addr)]);
495 list_del_rcu(&n->list);
496 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
497 if (n->addr < temp_node->addr)
498 break;
499 }
500 list_add_tail_rcu(&n->list, &temp_node->list);
501 tipc_node_write_unlock_fast(n);
502
503update:
504 if (n->peer_hash_mix ^ hash_mixes)
505 tipc_node_assign_peer_net(n, hash_mixes);
506 if (n->capabilities == capabilities)
507 goto exit;
508 /* Same node may come back with new capabilities */
509 tipc_node_write_lock(n);
510 n->capabilities = capabilities;
511 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
512 l = n->links[bearer_id].link;
513 if (l)
514 tipc_link_update_caps(l, capabilities);
515 }
516 tipc_node_write_unlock_fast(n);
517
518 /* Calculate cluster capabilities */
519 tn->capabilities = TIPC_NODE_CAPABILITIES;
520 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
521 tn->capabilities &= temp_node->capabilities;
522 }
523
524 tipc_bcast_toggle_rcast(net,
525 (tn->capabilities & TIPC_BCAST_RCAST));
526
527 goto exit;
528 }
529 n = kzalloc(sizeof(*n), GFP_ATOMIC);
530 if (!n) {
531 pr_warn("Node creation failed, no memory\n");
532 goto exit;
533 }
534 tipc_nodeid2string(n->peer_id_string, peer_id);
535#ifdef CONFIG_TIPC_CRYPTO
536 if (unlikely(tipc_crypto_start(&n->crypto_rx, net, n))) {
537 pr_warn("Failed to start crypto RX(%s)!\n", n->peer_id_string);
538 kfree(n);
539 n = NULL;
540 goto exit;
541 }
542#endif
543 n->addr = addr;
544 n->preliminary = preliminary;
545 memcpy(&n->peer_id, peer_id, 16);
546 n->net = net;
547 n->peer_net = NULL;
548 n->peer_hash_mix = 0;
549 /* Assign kernel local namespace if exists */
550 tipc_node_assign_peer_net(n, hash_mixes);
551 n->capabilities = capabilities;
552 kref_init(&n->kref);
553 rwlock_init(&n->lock);
554 INIT_HLIST_NODE(&n->hash);
555 INIT_LIST_HEAD(&n->list);
556 INIT_LIST_HEAD(&n->publ_list);
557 INIT_LIST_HEAD(&n->conn_sks);
558 skb_queue_head_init(&n->bc_entry.namedq);
559 skb_queue_head_init(&n->bc_entry.inputq1);
560 __skb_queue_head_init(&n->bc_entry.arrvq);
561 skb_queue_head_init(&n->bc_entry.inputq2);
562 for (i = 0; i < MAX_BEARERS; i++)
563 spin_lock_init(&n->links[i].lock);
564 n->state = SELF_DOWN_PEER_LEAVING;
565 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
566 n->signature = INVALID_NODE_SIG;
567 n->active_links[0] = INVALID_BEARER_ID;
568 n->active_links[1] = INVALID_BEARER_ID;
569 n->bc_entry.link = NULL;
570 tipc_node_get(n);
571 timer_setup(&n->timer, tipc_node_timeout, 0);
572 /* Start a slow timer anyway, crypto needs it */
573 n->keepalive_intv = 10000;
574 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
575 if (!mod_timer(&n->timer, intv))
576 tipc_node_get(n);
577 hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
578 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
579 if (n->addr < temp_node->addr)
580 break;
581 }
582 list_add_tail_rcu(&n->list, &temp_node->list);
583 /* Calculate cluster capabilities */
584 tn->capabilities = TIPC_NODE_CAPABILITIES;
585 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
586 tn->capabilities &= temp_node->capabilities;
587 }
588 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
589 trace_tipc_node_create(n, true, " ");
590exit:
591 spin_unlock_bh(&tn->node_list_lock);
592 return n;
593}
594
595static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
596{
597 unsigned long tol = tipc_link_tolerance(l);
598 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
599
600 /* Link with lowest tolerance determines timer interval */
601 if (intv < n->keepalive_intv)
602 n->keepalive_intv = intv;
603
604 /* Ensure link's abort limit corresponds to current tolerance */
605 tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
606}
607
608static void tipc_node_delete_from_list(struct tipc_node *node)
609{
610#ifdef CONFIG_TIPC_CRYPTO
611 tipc_crypto_key_flush(node->crypto_rx);
612#endif
613 list_del_rcu(&node->list);
614 hlist_del_rcu(&node->hash);
615 tipc_node_put(node);
616}
617
618static void tipc_node_delete(struct tipc_node *node)
619{
620 trace_tipc_node_delete(node, true, " ");
621 tipc_node_delete_from_list(node);
622
623 del_timer_sync(&node->timer);
624 tipc_node_put(node);
625}
626
627void tipc_node_stop(struct net *net)
628{
629 struct tipc_net *tn = tipc_net(net);
630 struct tipc_node *node, *t_node;
631
632 spin_lock_bh(&tn->node_list_lock);
633 list_for_each_entry_safe(node, t_node, &tn->node_list, list)
634 tipc_node_delete(node);
635 spin_unlock_bh(&tn->node_list_lock);
636}
637
638void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
639{
640 struct tipc_node *n;
641
642 if (in_own_node(net, addr))
643 return;
644
645 n = tipc_node_find(net, addr);
646 if (!n) {
647 pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
648 return;
649 }
650 tipc_node_write_lock(n);
651 list_add_tail(subscr, &n->publ_list);
652 tipc_node_write_unlock_fast(n);
653 tipc_node_put(n);
654}
655
656void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
657{
658 struct tipc_node *n;
659
660 if (in_own_node(net, addr))
661 return;
662
663 n = tipc_node_find(net, addr);
664 if (!n) {
665 pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
666 return;
667 }
668 tipc_node_write_lock(n);
669 list_del_init(subscr);
670 tipc_node_write_unlock_fast(n);
671 tipc_node_put(n);
672}
673
674int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
675{
676 struct tipc_node *node;
677 struct tipc_sock_conn *conn;
678 int err = 0;
679
680 if (in_own_node(net, dnode))
681 return 0;
682
683 node = tipc_node_find(net, dnode);
684 if (!node) {
685 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
686 return -EHOSTUNREACH;
687 }
688 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
689 if (!conn) {
690 err = -EHOSTUNREACH;
691 goto exit;
692 }
693 conn->peer_node = dnode;
694 conn->port = port;
695 conn->peer_port = peer_port;
696
697 tipc_node_write_lock(node);
698 list_add_tail(&conn->list, &node->conn_sks);
699 tipc_node_write_unlock(node);
700exit:
701 tipc_node_put(node);
702 return err;
703}
704
705void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
706{
707 struct tipc_node *node;
708 struct tipc_sock_conn *conn, *safe;
709
710 if (in_own_node(net, dnode))
711 return;
712
713 node = tipc_node_find(net, dnode);
714 if (!node)
715 return;
716
717 tipc_node_write_lock(node);
718 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
719 if (port != conn->port)
720 continue;
721 list_del(&conn->list);
722 kfree(conn);
723 }
724 tipc_node_write_unlock(node);
725 tipc_node_put(node);
726}
727
728static void tipc_node_clear_links(struct tipc_node *node)
729{
730 int i;
731
732 for (i = 0; i < MAX_BEARERS; i++) {
733 struct tipc_link_entry *le = &node->links[i];
734
735 if (le->link) {
736 kfree(le->link);
737 le->link = NULL;
738 node->link_cnt--;
739 }
740 }
741}
742
743/* tipc_node_cleanup - delete nodes that does not
744 * have active links for NODE_CLEANUP_AFTER time
745 */
746static bool tipc_node_cleanup(struct tipc_node *peer)
747{
748 struct tipc_node *temp_node;
749 struct tipc_net *tn = tipc_net(peer->net);
750 bool deleted = false;
751
752 /* If lock held by tipc_node_stop() the node will be deleted anyway */
753 if (!spin_trylock_bh(&tn->node_list_lock))
754 return false;
755
756 tipc_node_write_lock(peer);
757
758 if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) {
759 tipc_node_clear_links(peer);
760 tipc_node_delete_from_list(peer);
761 deleted = true;
762 }
763 tipc_node_write_unlock(peer);
764
765 if (!deleted) {
766 spin_unlock_bh(&tn->node_list_lock);
767 return deleted;
768 }
769
770 /* Calculate cluster capabilities */
771 tn->capabilities = TIPC_NODE_CAPABILITIES;
772 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
773 tn->capabilities &= temp_node->capabilities;
774 }
775 tipc_bcast_toggle_rcast(peer->net,
776 (tn->capabilities & TIPC_BCAST_RCAST));
777 spin_unlock_bh(&tn->node_list_lock);
778 return deleted;
779}
780
781/* tipc_node_timeout - handle expiration of node timer
782 */
783static void tipc_node_timeout(struct timer_list *t)
784{
785 struct tipc_node *n = from_timer(n, t, timer);
786 struct tipc_link_entry *le;
787 struct sk_buff_head xmitq;
788 int remains = n->link_cnt;
789 int bearer_id;
790 int rc = 0;
791
792 trace_tipc_node_timeout(n, false, " ");
793 if (!node_is_up(n) && tipc_node_cleanup(n)) {
794 /*Removing the reference of Timer*/
795 tipc_node_put(n);
796 return;
797 }
798
799#ifdef CONFIG_TIPC_CRYPTO
800 /* Take any crypto key related actions first */
801 tipc_crypto_timeout(n->crypto_rx);
802#endif
803 __skb_queue_head_init(&xmitq);
804
805 /* Initial node interval to value larger (10 seconds), then it will be
806 * recalculated with link lowest tolerance
807 */
808 tipc_node_read_lock(n);
809 n->keepalive_intv = 10000;
810 tipc_node_read_unlock(n);
811 for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) {
812 tipc_node_read_lock(n);
813 le = &n->links[bearer_id];
814 if (le->link) {
815 spin_lock_bh(&le->lock);
816 /* Link tolerance may change asynchronously: */
817 tipc_node_calculate_timer(n, le->link);
818 rc = tipc_link_timeout(le->link, &xmitq);
819 spin_unlock_bh(&le->lock);
820 remains--;
821 }
822 tipc_node_read_unlock(n);
823 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr, n);
824 if (rc & TIPC_LINK_DOWN_EVT)
825 tipc_node_link_down(n, bearer_id, false);
826 }
827 mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
828}
829
830/**
831 * __tipc_node_link_up - handle addition of link
832 * @n: target tipc_node
833 * @bearer_id: id of the bearer
834 * @xmitq: queue for messages to be xmited on
835 * Node lock must be held by caller
836 * Link becomes active (alone or shared) or standby, depending on its priority.
837 */
838static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
839 struct sk_buff_head *xmitq)
840{
841 int *slot0 = &n->active_links[0];
842 int *slot1 = &n->active_links[1];
843 struct tipc_link *ol = node_active_link(n, 0);
844 struct tipc_link *nl = n->links[bearer_id].link;
845
846 if (!nl || tipc_link_is_up(nl))
847 return;
848
849 tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
850 if (!tipc_link_is_up(nl))
851 return;
852
853 n->working_links++;
854 n->action_flags |= TIPC_NOTIFY_LINK_UP;
855 n->link_id = tipc_link_id(nl);
856
857 /* Leave room for tunnel header when returning 'mtu' to users: */
858 n->links[bearer_id].mtu = tipc_link_mss(nl);
859
860 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
861 tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
862
863 pr_debug("Established link <%s> on network plane %c\n",
864 tipc_link_name(nl), tipc_link_plane(nl));
865 trace_tipc_node_link_up(n, true, " ");
866
867 /* Ensure that a STATE message goes first */
868 tipc_link_build_state_msg(nl, xmitq);
869
870 /* First link? => give it both slots */
871 if (!ol) {
872 *slot0 = bearer_id;
873 *slot1 = bearer_id;
874 tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
875 n->action_flags |= TIPC_NOTIFY_NODE_UP;
876 tipc_link_set_active(nl, true);
877 tipc_bcast_add_peer(n->net, nl, xmitq);
878 return;
879 }
880
881 /* Second link => redistribute slots */
882 if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
883 pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
884 *slot0 = bearer_id;
885 *slot1 = bearer_id;
886 tipc_link_set_active(nl, true);
887 tipc_link_set_active(ol, false);
888 } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
889 tipc_link_set_active(nl, true);
890 *slot1 = bearer_id;
891 } else {
892 pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
893 }
894
895 /* Prepare synchronization with first link */
896 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
897}
898
899/**
900 * tipc_node_link_up - handle addition of link
901 * @n: target tipc_node
902 * @bearer_id: id of the bearer
903 * @xmitq: queue for messages to be xmited on
904 *
905 * Link becomes active (alone or shared) or standby, depending on its priority.
906 */
907static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
908 struct sk_buff_head *xmitq)
909{
910 struct tipc_media_addr *maddr;
911
912 tipc_node_write_lock(n);
913 __tipc_node_link_up(n, bearer_id, xmitq);
914 maddr = &n->links[bearer_id].maddr;
915 tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr, n);
916 tipc_node_write_unlock(n);
917}
918
919/**
920 * tipc_node_link_failover() - start failover in case "half-failover"
921 *
922 * This function is only called in a very special situation where link
923 * failover can be already started on peer node but not on this node.
924 * This can happen when e.g.::
925 *
926 * 1. Both links <1A-2A>, <1B-2B> down
927 * 2. Link endpoint 2A up, but 1A still down (e.g. due to network
928 * disturbance, wrong session, etc.)
929 * 3. Link <1B-2B> up
930 * 4. Link endpoint 2A down (e.g. due to link tolerance timeout)
931 * 5. Node 2 starts failover onto link <1B-2B>
932 *
933 * ==> Node 1 does never start link/node failover!
934 *
935 * @n: tipc node structure
936 * @l: link peer endpoint failingover (- can be NULL)
937 * @tnl: tunnel link
938 * @xmitq: queue for messages to be xmited on tnl link later
939 */
940static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,
941 struct tipc_link *tnl,
942 struct sk_buff_head *xmitq)
943{
944 /* Avoid to be "self-failover" that can never end */
945 if (!tipc_link_is_up(tnl))
946 return;
947
948 /* Don't rush, failure link may be in the process of resetting */
949 if (l && !tipc_link_is_reset(l))
950 return;
951
952 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
953 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
954
955 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
956 tipc_link_failover_prepare(l, tnl, xmitq);
957
958 if (l)
959 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
960 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
961}
962
963/**
964 * __tipc_node_link_down - handle loss of link
965 * @n: target tipc_node
966 * @bearer_id: id of the bearer
967 * @xmitq: queue for messages to be xmited on
968 * @maddr: output media address of the bearer
969 */
970static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
971 struct sk_buff_head *xmitq,
972 struct tipc_media_addr **maddr)
973{
974 struct tipc_link_entry *le = &n->links[*bearer_id];
975 int *slot0 = &n->active_links[0];
976 int *slot1 = &n->active_links[1];
977 int i, highest = 0, prio;
978 struct tipc_link *l, *_l, *tnl;
979
980 l = n->links[*bearer_id].link;
981 if (!l || tipc_link_is_reset(l))
982 return;
983
984 n->working_links--;
985 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
986 n->link_id = tipc_link_id(l);
987
988 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
989
990 pr_debug("Lost link <%s> on network plane %c\n",
991 tipc_link_name(l), tipc_link_plane(l));
992
993 /* Select new active link if any available */
994 *slot0 = INVALID_BEARER_ID;
995 *slot1 = INVALID_BEARER_ID;
996 for (i = 0; i < MAX_BEARERS; i++) {
997 _l = n->links[i].link;
998 if (!_l || !tipc_link_is_up(_l))
999 continue;
1000 if (_l == l)
1001 continue;
1002 prio = tipc_link_prio(_l);
1003 if (prio < highest)
1004 continue;
1005 if (prio > highest) {
1006 highest = prio;
1007 *slot0 = i;
1008 *slot1 = i;
1009 continue;
1010 }
1011 *slot1 = i;
1012 }
1013
1014 if (!node_is_up(n)) {
1015 if (tipc_link_peer_is_down(l))
1016 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1017 tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
1018 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!");
1019 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1020 tipc_link_reset(l);
1021 tipc_link_build_reset_msg(l, xmitq);
1022 *maddr = &n->links[*bearer_id].maddr;
1023 node_lost_contact(n, &le->inputq);
1024 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1025 return;
1026 }
1027 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1028
1029 /* There is still a working link => initiate failover */
1030 *bearer_id = n->active_links[0];
1031 tnl = n->links[*bearer_id].link;
1032 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1033 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1034 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
1035 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
1036 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!");
1037 tipc_link_reset(l);
1038 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1039 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1040 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
1041 *maddr = &n->links[*bearer_id].maddr;
1042}
1043
1044static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
1045{
1046 struct tipc_link_entry *le = &n->links[bearer_id];
1047 struct tipc_media_addr *maddr = NULL;
1048 struct tipc_link *l = le->link;
1049 int old_bearer_id = bearer_id;
1050 struct sk_buff_head xmitq;
1051
1052 if (!l)
1053 return;
1054
1055 __skb_queue_head_init(&xmitq);
1056
1057 tipc_node_write_lock(n);
1058 if (!tipc_link_is_establishing(l)) {
1059 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
1060 } else {
1061 /* Defuse pending tipc_node_link_up() */
1062 tipc_link_reset(l);
1063 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1064 }
1065 if (delete) {
1066 kfree(l);
1067 le->link = NULL;
1068 n->link_cnt--;
1069 }
1070 trace_tipc_node_link_down(n, true, "node link down or deleted!");
1071 tipc_node_write_unlock(n);
1072 if (delete)
1073 tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
1074 if (!skb_queue_empty(&xmitq))
1075 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr, n);
1076 tipc_sk_rcv(n->net, &le->inputq);
1077}
1078
1079static bool node_is_up(struct tipc_node *n)
1080{
1081 return n->active_links[0] != INVALID_BEARER_ID;
1082}
1083
1084bool tipc_node_is_up(struct net *net, u32 addr)
1085{
1086 struct tipc_node *n;
1087 bool retval = false;
1088
1089 if (in_own_node(net, addr))
1090 return true;
1091
1092 n = tipc_node_find(net, addr);
1093 if (!n)
1094 return false;
1095 retval = node_is_up(n);
1096 tipc_node_put(n);
1097 return retval;
1098}
1099
1100static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
1101{
1102 struct tipc_node *n;
1103
1104 addr ^= tipc_net(net)->random;
1105 while ((n = tipc_node_find(net, addr))) {
1106 tipc_node_put(n);
1107 addr++;
1108 }
1109 return addr;
1110}
1111
1112/* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
1113 * Returns suggested address if any, otherwise 0
1114 */
1115u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
1116{
1117 struct tipc_net *tn = tipc_net(net);
1118 struct tipc_node *n;
1119 bool preliminary;
1120 u32 sugg_addr;
1121
1122 /* Suggest new address if some other peer is using this one */
1123 n = tipc_node_find(net, addr);
1124 if (n) {
1125 if (!memcmp(n->peer_id, id, NODE_ID_LEN))
1126 addr = 0;
1127 tipc_node_put(n);
1128 if (!addr)
1129 return 0;
1130 return tipc_node_suggest_addr(net, addr);
1131 }
1132
1133 /* Suggest previously used address if peer is known */
1134 n = tipc_node_find_by_id(net, id);
1135 if (n) {
1136 sugg_addr = n->addr;
1137 preliminary = n->preliminary;
1138 tipc_node_put(n);
1139 if (!preliminary)
1140 return sugg_addr;
1141 }
1142
1143 /* Even this node may be in conflict */
1144 if (tn->trial_addr == addr)
1145 return tipc_node_suggest_addr(net, addr);
1146
1147 return 0;
1148}
1149
1150void tipc_node_check_dest(struct net *net, u32 addr,
1151 u8 *peer_id, struct tipc_bearer *b,
1152 u16 capabilities, u32 signature, u32 hash_mixes,
1153 struct tipc_media_addr *maddr,
1154 bool *respond, bool *dupl_addr)
1155{
1156 struct tipc_node *n;
1157 struct tipc_link *l, *snd_l;
1158 struct tipc_link_entry *le;
1159 bool addr_match = false;
1160 bool sign_match = false;
1161 bool link_up = false;
1162 bool accept_addr = false;
1163 bool reset = true;
1164 char *if_name;
1165 unsigned long intv;
1166 u16 session;
1167
1168 *dupl_addr = false;
1169 *respond = false;
1170
1171 n = tipc_node_create(net, addr, peer_id, capabilities, hash_mixes,
1172 false);
1173 if (!n)
1174 return;
1175
1176 tipc_node_write_lock(n);
1177 if (unlikely(!n->bc_entry.link)) {
1178 snd_l = tipc_bc_sndlink(net);
1179 if (!tipc_link_bc_create(net, tipc_own_addr(net),
1180 addr, peer_id, U16_MAX,
1181 tipc_link_min_win(snd_l),
1182 tipc_link_max_win(snd_l),
1183 n->capabilities,
1184 &n->bc_entry.inputq1,
1185 &n->bc_entry.namedq, snd_l,
1186 &n->bc_entry.link)) {
1187 pr_warn("Broadcast rcv link creation failed, no mem\n");
1188 tipc_node_write_unlock_fast(n);
1189 tipc_node_put(n);
1190 return;
1191 }
1192 }
1193
1194 le = &n->links[b->identity];
1195
1196 /* Prepare to validate requesting node's signature and media address */
1197 l = le->link;
1198 link_up = l && tipc_link_is_up(l);
1199 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
1200 sign_match = (signature == n->signature);
1201
1202 /* These three flags give us eight permutations: */
1203
1204 if (sign_match && addr_match && link_up) {
1205 /* All is fine. Do nothing. */
1206 reset = false;
1207 /* Peer node is not a container/local namespace */
1208 if (!n->peer_hash_mix)
1209 n->peer_hash_mix = hash_mixes;
1210 } else if (sign_match && addr_match && !link_up) {
1211 /* Respond. The link will come up in due time */
1212 *respond = true;
1213 } else if (sign_match && !addr_match && link_up) {
1214 /* Peer has changed i/f address without rebooting.
1215 * If so, the link will reset soon, and the next
1216 * discovery will be accepted. So we can ignore it.
1217 * It may also be a cloned or malicious peer having
1218 * chosen the same node address and signature as an
1219 * existing one.
1220 * Ignore requests until the link goes down, if ever.
1221 */
1222 *dupl_addr = true;
1223 } else if (sign_match && !addr_match && !link_up) {
1224 /* Peer link has changed i/f address without rebooting.
1225 * It may also be a cloned or malicious peer; we can't
1226 * distinguish between the two.
1227 * The signature is correct, so we must accept.
1228 */
1229 accept_addr = true;
1230 *respond = true;
1231 } else if (!sign_match && addr_match && link_up) {
1232 /* Peer node rebooted. Two possibilities:
1233 * - Delayed re-discovery; this link endpoint has already
1234 * reset and re-established contact with the peer, before
1235 * receiving a discovery message from that node.
1236 * (The peer happened to receive one from this node first).
1237 * - The peer came back so fast that our side has not
1238 * discovered it yet. Probing from this side will soon
1239 * reset the link, since there can be no working link
1240 * endpoint at the peer end, and the link will re-establish.
1241 * Accept the signature, since it comes from a known peer.
1242 */
1243 n->signature = signature;
1244 } else if (!sign_match && addr_match && !link_up) {
1245 /* The peer node has rebooted.
1246 * Accept signature, since it is a known peer.
1247 */
1248 n->signature = signature;
1249 *respond = true;
1250 } else if (!sign_match && !addr_match && link_up) {
1251 /* Peer rebooted with new address, or a new/duplicate peer.
1252 * Ignore until the link goes down, if ever.
1253 */
1254 *dupl_addr = true;
1255 } else if (!sign_match && !addr_match && !link_up) {
1256 /* Peer rebooted with new address, or it is a new peer.
1257 * Accept signature and address.
1258 */
1259 n->signature = signature;
1260 accept_addr = true;
1261 *respond = true;
1262 }
1263
1264 if (!accept_addr)
1265 goto exit;
1266
1267 /* Now create new link if not already existing */
1268 if (!l) {
1269 if (n->link_cnt == 2)
1270 goto exit;
1271
1272 if_name = strchr(b->name, ':') + 1;
1273 get_random_bytes(&session, sizeof(u16));
1274 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
1275 b->net_plane, b->mtu, b->priority,
1276 b->min_win, b->max_win, session,
1277 tipc_own_addr(net), addr, peer_id,
1278 n->capabilities,
1279 tipc_bc_sndlink(n->net), n->bc_entry.link,
1280 &le->inputq,
1281 &n->bc_entry.namedq, &l)) {
1282 *respond = false;
1283 goto exit;
1284 }
1285 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!");
1286 tipc_link_reset(l);
1287 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1288 if (n->state == NODE_FAILINGOVER)
1289 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1290 le->link = l;
1291 n->link_cnt++;
1292 tipc_node_calculate_timer(n, l);
1293 if (n->link_cnt == 1) {
1294 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
1295 if (!mod_timer(&n->timer, intv))
1296 tipc_node_get(n);
1297 }
1298 }
1299 memcpy(&le->maddr, maddr, sizeof(*maddr));
1300exit:
1301 tipc_node_write_unlock(n);
1302 if (reset && l && !tipc_link_is_reset(l))
1303 tipc_node_link_down(n, b->identity, false);
1304 tipc_node_put(n);
1305}
1306
1307void tipc_node_delete_links(struct net *net, int bearer_id)
1308{
1309 struct tipc_net *tn = net_generic(net, tipc_net_id);
1310 struct tipc_node *n;
1311
1312 rcu_read_lock();
1313 list_for_each_entry_rcu(n, &tn->node_list, list) {
1314 tipc_node_link_down(n, bearer_id, true);
1315 }
1316 rcu_read_unlock();
1317}
1318
1319static void tipc_node_reset_links(struct tipc_node *n)
1320{
1321 int i;
1322
1323 pr_warn("Resetting all links to %x\n", n->addr);
1324
1325 trace_tipc_node_reset_links(n, true, " ");
1326 for (i = 0; i < MAX_BEARERS; i++) {
1327 tipc_node_link_down(n, i, false);
1328 }
1329}
1330
1331/* tipc_node_fsm_evt - node finite state machine
1332 * Determines when contact is allowed with peer node
1333 */
1334static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
1335{
1336 int state = n->state;
1337
1338 switch (state) {
1339 case SELF_DOWN_PEER_DOWN:
1340 switch (evt) {
1341 case SELF_ESTABL_CONTACT_EVT:
1342 state = SELF_UP_PEER_COMING;
1343 break;
1344 case PEER_ESTABL_CONTACT_EVT:
1345 state = SELF_COMING_PEER_UP;
1346 break;
1347 case SELF_LOST_CONTACT_EVT:
1348 case PEER_LOST_CONTACT_EVT:
1349 break;
1350 case NODE_SYNCH_END_EVT:
1351 case NODE_SYNCH_BEGIN_EVT:
1352 case NODE_FAILOVER_BEGIN_EVT:
1353 case NODE_FAILOVER_END_EVT:
1354 default:
1355 goto illegal_evt;
1356 }
1357 break;
1358 case SELF_UP_PEER_UP:
1359 switch (evt) {
1360 case SELF_LOST_CONTACT_EVT:
1361 state = SELF_DOWN_PEER_LEAVING;
1362 break;
1363 case PEER_LOST_CONTACT_EVT:
1364 state = SELF_LEAVING_PEER_DOWN;
1365 break;
1366 case NODE_SYNCH_BEGIN_EVT:
1367 state = NODE_SYNCHING;
1368 break;
1369 case NODE_FAILOVER_BEGIN_EVT:
1370 state = NODE_FAILINGOVER;
1371 break;
1372 case SELF_ESTABL_CONTACT_EVT:
1373 case PEER_ESTABL_CONTACT_EVT:
1374 case NODE_SYNCH_END_EVT:
1375 case NODE_FAILOVER_END_EVT:
1376 break;
1377 default:
1378 goto illegal_evt;
1379 }
1380 break;
1381 case SELF_DOWN_PEER_LEAVING:
1382 switch (evt) {
1383 case PEER_LOST_CONTACT_EVT:
1384 state = SELF_DOWN_PEER_DOWN;
1385 break;
1386 case SELF_ESTABL_CONTACT_EVT:
1387 case PEER_ESTABL_CONTACT_EVT:
1388 case SELF_LOST_CONTACT_EVT:
1389 break;
1390 case NODE_SYNCH_END_EVT:
1391 case NODE_SYNCH_BEGIN_EVT:
1392 case NODE_FAILOVER_BEGIN_EVT:
1393 case NODE_FAILOVER_END_EVT:
1394 default:
1395 goto illegal_evt;
1396 }
1397 break;
1398 case SELF_UP_PEER_COMING:
1399 switch (evt) {
1400 case PEER_ESTABL_CONTACT_EVT:
1401 state = SELF_UP_PEER_UP;
1402 break;
1403 case SELF_LOST_CONTACT_EVT:
1404 state = SELF_DOWN_PEER_DOWN;
1405 break;
1406 case SELF_ESTABL_CONTACT_EVT:
1407 case PEER_LOST_CONTACT_EVT:
1408 case NODE_SYNCH_END_EVT:
1409 case NODE_FAILOVER_BEGIN_EVT:
1410 break;
1411 case NODE_SYNCH_BEGIN_EVT:
1412 case NODE_FAILOVER_END_EVT:
1413 default:
1414 goto illegal_evt;
1415 }
1416 break;
1417 case SELF_COMING_PEER_UP:
1418 switch (evt) {
1419 case SELF_ESTABL_CONTACT_EVT:
1420 state = SELF_UP_PEER_UP;
1421 break;
1422 case PEER_LOST_CONTACT_EVT:
1423 state = SELF_DOWN_PEER_DOWN;
1424 break;
1425 case SELF_LOST_CONTACT_EVT:
1426 case PEER_ESTABL_CONTACT_EVT:
1427 break;
1428 case NODE_SYNCH_END_EVT:
1429 case NODE_SYNCH_BEGIN_EVT:
1430 case NODE_FAILOVER_BEGIN_EVT:
1431 case NODE_FAILOVER_END_EVT:
1432 default:
1433 goto illegal_evt;
1434 }
1435 break;
1436 case SELF_LEAVING_PEER_DOWN:
1437 switch (evt) {
1438 case SELF_LOST_CONTACT_EVT:
1439 state = SELF_DOWN_PEER_DOWN;
1440 break;
1441 case SELF_ESTABL_CONTACT_EVT:
1442 case PEER_ESTABL_CONTACT_EVT:
1443 case PEER_LOST_CONTACT_EVT:
1444 break;
1445 case NODE_SYNCH_END_EVT:
1446 case NODE_SYNCH_BEGIN_EVT:
1447 case NODE_FAILOVER_BEGIN_EVT:
1448 case NODE_FAILOVER_END_EVT:
1449 default:
1450 goto illegal_evt;
1451 }
1452 break;
1453 case NODE_FAILINGOVER:
1454 switch (evt) {
1455 case SELF_LOST_CONTACT_EVT:
1456 state = SELF_DOWN_PEER_LEAVING;
1457 break;
1458 case PEER_LOST_CONTACT_EVT:
1459 state = SELF_LEAVING_PEER_DOWN;
1460 break;
1461 case NODE_FAILOVER_END_EVT:
1462 state = SELF_UP_PEER_UP;
1463 break;
1464 case NODE_FAILOVER_BEGIN_EVT:
1465 case SELF_ESTABL_CONTACT_EVT:
1466 case PEER_ESTABL_CONTACT_EVT:
1467 break;
1468 case NODE_SYNCH_BEGIN_EVT:
1469 case NODE_SYNCH_END_EVT:
1470 default:
1471 goto illegal_evt;
1472 }
1473 break;
1474 case NODE_SYNCHING:
1475 switch (evt) {
1476 case SELF_LOST_CONTACT_EVT:
1477 state = SELF_DOWN_PEER_LEAVING;
1478 break;
1479 case PEER_LOST_CONTACT_EVT:
1480 state = SELF_LEAVING_PEER_DOWN;
1481 break;
1482 case NODE_SYNCH_END_EVT:
1483 state = SELF_UP_PEER_UP;
1484 break;
1485 case NODE_FAILOVER_BEGIN_EVT:
1486 state = NODE_FAILINGOVER;
1487 break;
1488 case NODE_SYNCH_BEGIN_EVT:
1489 case SELF_ESTABL_CONTACT_EVT:
1490 case PEER_ESTABL_CONTACT_EVT:
1491 break;
1492 case NODE_FAILOVER_END_EVT:
1493 default:
1494 goto illegal_evt;
1495 }
1496 break;
1497 default:
1498 pr_err("Unknown node fsm state %x\n", state);
1499 break;
1500 }
1501 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1502 n->state = state;
1503 return;
1504
1505illegal_evt:
1506 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1507 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1508}
1509
1510static void node_lost_contact(struct tipc_node *n,
1511 struct sk_buff_head *inputq)
1512{
1513 struct tipc_sock_conn *conn, *safe;
1514 struct tipc_link *l;
1515 struct list_head *conns = &n->conn_sks;
1516 struct sk_buff *skb;
1517 uint i;
1518
1519 pr_debug("Lost contact with %x\n", n->addr);
1520 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
1521 trace_tipc_node_lost_contact(n, true, " ");
1522
1523 /* Clean up broadcast state */
1524 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1525 skb_queue_purge(&n->bc_entry.namedq);
1526
1527 /* Abort any ongoing link failover */
1528 for (i = 0; i < MAX_BEARERS; i++) {
1529 l = n->links[i].link;
1530 if (l)
1531 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1532 }
1533
1534 /* Notify publications from this node */
1535 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1536 n->peer_net = NULL;
1537 n->peer_hash_mix = 0;
1538 /* Notify sockets connected to node */
1539 list_for_each_entry_safe(conn, safe, conns, list) {
1540 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1541 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1542 conn->peer_node, conn->port,
1543 conn->peer_port, TIPC_ERR_NO_NODE);
1544 if (likely(skb))
1545 skb_queue_tail(inputq, skb);
1546 list_del(&conn->list);
1547 kfree(conn);
1548 }
1549}
1550
1551/**
1552 * tipc_node_get_linkname - get the name of a link
1553 *
1554 * @net: the applicable net namespace
1555 * @bearer_id: id of the bearer
1556 * @addr: peer node address
1557 * @linkname: link name output buffer
1558 * @len: size of @linkname output buffer
1559 *
1560 * Return: 0 on success
1561 */
1562int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1563 char *linkname, size_t len)
1564{
1565 struct tipc_link *link;
1566 int err = -EINVAL;
1567 struct tipc_node *node = tipc_node_find(net, addr);
1568
1569 if (!node)
1570 return err;
1571
1572 if (bearer_id >= MAX_BEARERS)
1573 goto exit;
1574
1575 tipc_node_read_lock(node);
1576 link = node->links[bearer_id].link;
1577 if (link) {
1578 strncpy(linkname, tipc_link_name(link), len);
1579 err = 0;
1580 }
1581 tipc_node_read_unlock(node);
1582exit:
1583 tipc_node_put(node);
1584 return err;
1585}
1586
1587/* Caller should hold node lock for the passed node */
1588static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1589{
1590 void *hdr;
1591 struct nlattr *attrs;
1592
1593 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1594 NLM_F_MULTI, TIPC_NL_NODE_GET);
1595 if (!hdr)
1596 return -EMSGSIZE;
1597
1598 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NODE);
1599 if (!attrs)
1600 goto msg_full;
1601
1602 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1603 goto attr_msg_full;
1604 if (node_is_up(node))
1605 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1606 goto attr_msg_full;
1607
1608 nla_nest_end(msg->skb, attrs);
1609 genlmsg_end(msg->skb, hdr);
1610
1611 return 0;
1612
1613attr_msg_full:
1614 nla_nest_cancel(msg->skb, attrs);
1615msg_full:
1616 genlmsg_cancel(msg->skb, hdr);
1617
1618 return -EMSGSIZE;
1619}
1620
1621static void tipc_lxc_xmit(struct net *peer_net, struct sk_buff_head *list)
1622{
1623 struct tipc_msg *hdr = buf_msg(skb_peek(list));
1624 struct sk_buff_head inputq;
1625
1626 switch (msg_user(hdr)) {
1627 case TIPC_LOW_IMPORTANCE:
1628 case TIPC_MEDIUM_IMPORTANCE:
1629 case TIPC_HIGH_IMPORTANCE:
1630 case TIPC_CRITICAL_IMPORTANCE:
1631 if (msg_connected(hdr) || msg_named(hdr) ||
1632 msg_direct(hdr)) {
1633 tipc_loopback_trace(peer_net, list);
1634 spin_lock_init(&list->lock);
1635 tipc_sk_rcv(peer_net, list);
1636 return;
1637 }
1638 if (msg_mcast(hdr)) {
1639 tipc_loopback_trace(peer_net, list);
1640 skb_queue_head_init(&inputq);
1641 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1642 __skb_queue_purge(list);
1643 skb_queue_purge(&inputq);
1644 return;
1645 }
1646 return;
1647 case MSG_FRAGMENTER:
1648 if (tipc_msg_assemble(list)) {
1649 tipc_loopback_trace(peer_net, list);
1650 skb_queue_head_init(&inputq);
1651 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1652 __skb_queue_purge(list);
1653 skb_queue_purge(&inputq);
1654 }
1655 return;
1656 case GROUP_PROTOCOL:
1657 case CONN_MANAGER:
1658 tipc_loopback_trace(peer_net, list);
1659 spin_lock_init(&list->lock);
1660 tipc_sk_rcv(peer_net, list);
1661 return;
1662 case LINK_PROTOCOL:
1663 case NAME_DISTRIBUTOR:
1664 case TUNNEL_PROTOCOL:
1665 case BCAST_PROTOCOL:
1666 return;
1667 default:
1668 return;
1669 }
1670}
1671
1672/**
1673 * tipc_node_xmit() - general link level function for message sending
1674 * @net: the applicable net namespace
1675 * @list: chain of buffers containing message
1676 * @dnode: address of destination node
1677 * @selector: a number used for deterministic link selection
1678 * Consumes the buffer chain.
1679 * Return: 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1680 */
1681int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1682 u32 dnode, int selector)
1683{
1684 struct tipc_link_entry *le = NULL;
1685 struct tipc_node *n;
1686 struct sk_buff_head xmitq;
1687 bool node_up = false;
1688 int bearer_id;
1689 int rc;
1690
1691 if (in_own_node(net, dnode)) {
1692 tipc_loopback_trace(net, list);
1693 spin_lock_init(&list->lock);
1694 tipc_sk_rcv(net, list);
1695 return 0;
1696 }
1697
1698 n = tipc_node_find(net, dnode);
1699 if (unlikely(!n)) {
1700 __skb_queue_purge(list);
1701 return -EHOSTUNREACH;
1702 }
1703
1704 tipc_node_read_lock(n);
1705 node_up = node_is_up(n);
1706 if (node_up && n->peer_net && check_net(n->peer_net)) {
1707 /* xmit inner linux container */
1708 tipc_lxc_xmit(n->peer_net, list);
1709 if (likely(skb_queue_empty(list))) {
1710 tipc_node_read_unlock(n);
1711 tipc_node_put(n);
1712 return 0;
1713 }
1714 }
1715
1716 bearer_id = n->active_links[selector & 1];
1717 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1718 tipc_node_read_unlock(n);
1719 tipc_node_put(n);
1720 __skb_queue_purge(list);
1721 return -EHOSTUNREACH;
1722 }
1723
1724 __skb_queue_head_init(&xmitq);
1725 le = &n->links[bearer_id];
1726 spin_lock_bh(&le->lock);
1727 rc = tipc_link_xmit(le->link, list, &xmitq);
1728 spin_unlock_bh(&le->lock);
1729 tipc_node_read_unlock(n);
1730
1731 if (unlikely(rc == -ENOBUFS))
1732 tipc_node_link_down(n, bearer_id, false);
1733 else
1734 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1735
1736 tipc_node_put(n);
1737
1738 return rc;
1739}
1740
1741/* tipc_node_xmit_skb(): send single buffer to destination
1742 * Buffers sent via this function are generally TIPC_SYSTEM_IMPORTANCE
1743 * messages, which will not be rejected
1744 * The only exception is datagram messages rerouted after secondary
1745 * lookup, which are rare and safe to dispose of anyway.
1746 */
1747int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1748 u32 selector)
1749{
1750 struct sk_buff_head head;
1751
1752 __skb_queue_head_init(&head);
1753 __skb_queue_tail(&head, skb);
1754 tipc_node_xmit(net, &head, dnode, selector);
1755 return 0;
1756}
1757
1758/* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1759 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1760 */
1761int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1762{
1763 struct sk_buff *skb;
1764 u32 selector, dnode;
1765
1766 while ((skb = __skb_dequeue(xmitq))) {
1767 selector = msg_origport(buf_msg(skb));
1768 dnode = msg_destnode(buf_msg(skb));
1769 tipc_node_xmit_skb(net, skb, dnode, selector);
1770 }
1771 return 0;
1772}
1773
1774void tipc_node_broadcast(struct net *net, struct sk_buff *skb, int rc_dests)
1775{
1776 struct sk_buff_head xmitq;
1777 struct sk_buff *txskb;
1778 struct tipc_node *n;
1779 u16 dummy;
1780 u32 dst;
1781
1782 /* Use broadcast if all nodes support it */
1783 if (!rc_dests && tipc_bcast_get_mode(net) != BCLINK_MODE_RCAST) {
1784 __skb_queue_head_init(&xmitq);
1785 __skb_queue_tail(&xmitq, skb);
1786 tipc_bcast_xmit(net, &xmitq, &dummy);
1787 return;
1788 }
1789
1790 /* Otherwise use legacy replicast method */
1791 rcu_read_lock();
1792 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1793 dst = n->addr;
1794 if (in_own_node(net, dst))
1795 continue;
1796 if (!node_is_up(n))
1797 continue;
1798 txskb = pskb_copy(skb, GFP_ATOMIC);
1799 if (!txskb)
1800 break;
1801 msg_set_destnode(buf_msg(txskb), dst);
1802 tipc_node_xmit_skb(net, txskb, dst, 0);
1803 }
1804 rcu_read_unlock();
1805 kfree_skb(skb);
1806}
1807
1808static void tipc_node_mcast_rcv(struct tipc_node *n)
1809{
1810 struct tipc_bclink_entry *be = &n->bc_entry;
1811
1812 /* 'arrvq' is under inputq2's lock protection */
1813 spin_lock_bh(&be->inputq2.lock);
1814 spin_lock_bh(&be->inputq1.lock);
1815 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1816 spin_unlock_bh(&be->inputq1.lock);
1817 spin_unlock_bh(&be->inputq2.lock);
1818 tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1819}
1820
1821static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1822 int bearer_id, struct sk_buff_head *xmitq)
1823{
1824 struct tipc_link *ucl;
1825 int rc;
1826
1827 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr, xmitq);
1828
1829 if (rc & TIPC_LINK_DOWN_EVT) {
1830 tipc_node_reset_links(n);
1831 return;
1832 }
1833
1834 if (!(rc & TIPC_LINK_SND_STATE))
1835 return;
1836
1837 /* If probe message, a STATE response will be sent anyway */
1838 if (msg_probe(hdr))
1839 return;
1840
1841 /* Produce a STATE message carrying broadcast NACK */
1842 tipc_node_read_lock(n);
1843 ucl = n->links[bearer_id].link;
1844 if (ucl)
1845 tipc_link_build_state_msg(ucl, xmitq);
1846 tipc_node_read_unlock(n);
1847}
1848
1849/**
1850 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1851 * @net: the applicable net namespace
1852 * @skb: TIPC packet
1853 * @bearer_id: id of bearer message arrived on
1854 *
1855 * Invoked with no locks held.
1856 */
1857static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1858{
1859 int rc;
1860 struct sk_buff_head xmitq;
1861 struct tipc_bclink_entry *be;
1862 struct tipc_link_entry *le;
1863 struct tipc_msg *hdr = buf_msg(skb);
1864 int usr = msg_user(hdr);
1865 u32 dnode = msg_destnode(hdr);
1866 struct tipc_node *n;
1867
1868 __skb_queue_head_init(&xmitq);
1869
1870 /* If NACK for other node, let rcv link for that node peek into it */
1871 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1872 n = tipc_node_find(net, dnode);
1873 else
1874 n = tipc_node_find(net, msg_prevnode(hdr));
1875 if (!n) {
1876 kfree_skb(skb);
1877 return;
1878 }
1879 be = &n->bc_entry;
1880 le = &n->links[bearer_id];
1881
1882 rc = tipc_bcast_rcv(net, be->link, skb);
1883
1884 /* Broadcast ACKs are sent on a unicast link */
1885 if (rc & TIPC_LINK_SND_STATE) {
1886 tipc_node_read_lock(n);
1887 tipc_link_build_state_msg(le->link, &xmitq);
1888 tipc_node_read_unlock(n);
1889 }
1890
1891 if (!skb_queue_empty(&xmitq))
1892 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1893
1894 if (!skb_queue_empty(&be->inputq1))
1895 tipc_node_mcast_rcv(n);
1896
1897 /* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
1898 if (!skb_queue_empty(&n->bc_entry.namedq))
1899 tipc_named_rcv(net, &n->bc_entry.namedq,
1900 &n->bc_entry.named_rcv_nxt,
1901 &n->bc_entry.named_open);
1902
1903 /* If reassembly or retransmission failure => reset all links to peer */
1904 if (rc & TIPC_LINK_DOWN_EVT)
1905 tipc_node_reset_links(n);
1906
1907 tipc_node_put(n);
1908}
1909
1910/**
1911 * tipc_node_check_state - check and if necessary update node state
1912 * @n: target tipc_node
1913 * @skb: TIPC packet
1914 * @bearer_id: identity of bearer delivering the packet
1915 * @xmitq: queue for messages to be xmited on
1916 * Return: true if state and msg are ok, otherwise false
1917 */
1918static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1919 int bearer_id, struct sk_buff_head *xmitq)
1920{
1921 struct tipc_msg *hdr = buf_msg(skb);
1922 int usr = msg_user(hdr);
1923 int mtyp = msg_type(hdr);
1924 u16 oseqno = msg_seqno(hdr);
1925 u16 exp_pkts = msg_msgcnt(hdr);
1926 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1927 int state = n->state;
1928 struct tipc_link *l, *tnl, *pl = NULL;
1929 struct tipc_media_addr *maddr;
1930 int pb_id;
1931
1932 if (trace_tipc_node_check_state_enabled()) {
1933 trace_tipc_skb_dump(skb, false, "skb for node state check");
1934 trace_tipc_node_check_state(n, true, " ");
1935 }
1936 l = n->links[bearer_id].link;
1937 if (!l)
1938 return false;
1939 rcv_nxt = tipc_link_rcv_nxt(l);
1940
1941
1942 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1943 return true;
1944
1945 /* Find parallel link, if any */
1946 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1947 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1948 pl = n->links[pb_id].link;
1949 break;
1950 }
1951 }
1952
1953 if (!tipc_link_validate_msg(l, hdr)) {
1954 trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
1955 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
1956 return false;
1957 }
1958
1959 /* Check and update node accesibility if applicable */
1960 if (state == SELF_UP_PEER_COMING) {
1961 if (!tipc_link_is_up(l))
1962 return true;
1963 if (!msg_peer_link_is_up(hdr))
1964 return true;
1965 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1966 }
1967
1968 if (state == SELF_DOWN_PEER_LEAVING) {
1969 if (msg_peer_node_is_up(hdr))
1970 return false;
1971 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1972 return true;
1973 }
1974
1975 if (state == SELF_LEAVING_PEER_DOWN)
1976 return false;
1977
1978 /* Ignore duplicate packets */
1979 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1980 return true;
1981
1982 /* Initiate or update failover mode if applicable */
1983 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1984 syncpt = oseqno + exp_pkts - 1;
1985 if (pl && !tipc_link_is_reset(pl)) {
1986 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1987 trace_tipc_node_link_down(n, true,
1988 "node link down <- failover!");
1989 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
1990 tipc_link_inputq(l));
1991 }
1992
1993 /* If parallel link was already down, and this happened before
1994 * the tunnel link came up, node failover was never started.
1995 * Ensure that a FAILOVER_MSG is sent to get peer out of
1996 * NODE_FAILINGOVER state, also this node must accept
1997 * TUNNEL_MSGs from peer.
1998 */
1999 if (n->state != NODE_FAILINGOVER)
2000 tipc_node_link_failover(n, pl, l, xmitq);
2001
2002 /* If pkts arrive out of order, use lowest calculated syncpt */
2003 if (less(syncpt, n->sync_point))
2004 n->sync_point = syncpt;
2005 }
2006
2007 /* Open parallel link when tunnel link reaches synch point */
2008 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
2009 if (!more(rcv_nxt, n->sync_point))
2010 return true;
2011 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
2012 if (pl)
2013 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
2014 return true;
2015 }
2016
2017 /* No syncing needed if only one link */
2018 if (!pl || !tipc_link_is_up(pl))
2019 return true;
2020
2021 /* Initiate synch mode if applicable */
2022 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
2023 if (n->capabilities & TIPC_TUNNEL_ENHANCED)
2024 syncpt = msg_syncpt(hdr);
2025 else
2026 syncpt = msg_seqno(msg_inner_hdr(hdr)) + exp_pkts - 1;
2027 if (!tipc_link_is_up(l))
2028 __tipc_node_link_up(n, bearer_id, xmitq);
2029 if (n->state == SELF_UP_PEER_UP) {
2030 n->sync_point = syncpt;
2031 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
2032 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
2033 }
2034 }
2035
2036 /* Open tunnel link when parallel link reaches synch point */
2037 if (n->state == NODE_SYNCHING) {
2038 if (tipc_link_is_synching(l)) {
2039 tnl = l;
2040 } else {
2041 tnl = pl;
2042 pl = l;
2043 }
2044 inputq_len = skb_queue_len(tipc_link_inputq(pl));
2045 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
2046 if (more(dlv_nxt, n->sync_point)) {
2047 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
2048 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
2049 return true;
2050 }
2051 if (l == pl)
2052 return true;
2053 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
2054 return true;
2055 if (usr == LINK_PROTOCOL)
2056 return true;
2057 return false;
2058 }
2059 return true;
2060}
2061
2062/**
2063 * tipc_rcv - process TIPC packets/messages arriving from off-node
2064 * @net: the applicable net namespace
2065 * @skb: TIPC packet
2066 * @b: pointer to bearer message arrived on
2067 *
2068 * Invoked with no locks held. Bearer pointer must point to a valid bearer
2069 * structure (i.e. cannot be NULL), but bearer can be inactive.
2070 */
2071void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
2072{
2073 struct sk_buff_head xmitq;
2074 struct tipc_link_entry *le;
2075 struct tipc_msg *hdr;
2076 struct tipc_node *n;
2077 int bearer_id = b->identity;
2078 u32 self = tipc_own_addr(net);
2079 int usr, rc = 0;
2080 u16 bc_ack;
2081#ifdef CONFIG_TIPC_CRYPTO
2082 struct tipc_ehdr *ehdr;
2083
2084 /* Check if message must be decrypted first */
2085 if (TIPC_SKB_CB(skb)->decrypted || !tipc_ehdr_validate(skb))
2086 goto rcv;
2087
2088 ehdr = (struct tipc_ehdr *)skb->data;
2089 if (likely(ehdr->user != LINK_CONFIG)) {
2090 n = tipc_node_find(net, ntohl(ehdr->addr));
2091 if (unlikely(!n))
2092 goto discard;
2093 } else {
2094 n = tipc_node_find_by_id(net, ehdr->id);
2095 }
2096 tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b);
2097 if (!skb)
2098 return;
2099
2100rcv:
2101#endif
2102 /* Ensure message is well-formed before touching the header */
2103 if (unlikely(!tipc_msg_validate(&skb)))
2104 goto discard;
2105 __skb_queue_head_init(&xmitq);
2106 hdr = buf_msg(skb);
2107 usr = msg_user(hdr);
2108 bc_ack = msg_bcast_ack(hdr);
2109
2110 /* Handle arrival of discovery or broadcast packet */
2111 if (unlikely(msg_non_seq(hdr))) {
2112 if (unlikely(usr == LINK_CONFIG))
2113 return tipc_disc_rcv(net, skb, b);
2114 else
2115 return tipc_node_bc_rcv(net, skb, bearer_id);
2116 }
2117
2118 /* Discard unicast link messages destined for another node */
2119 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
2120 goto discard;
2121
2122 /* Locate neighboring node that sent packet */
2123 n = tipc_node_find(net, msg_prevnode(hdr));
2124 if (unlikely(!n))
2125 goto discard;
2126 le = &n->links[bearer_id];
2127
2128 /* Ensure broadcast reception is in synch with peer's send state */
2129 if (unlikely(usr == LINK_PROTOCOL)) {
2130 if (unlikely(skb_linearize(skb))) {
2131 tipc_node_put(n);
2132 goto discard;
2133 }
2134 hdr = buf_msg(skb);
2135 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
2136 } else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack)) {
2137 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
2138 }
2139
2140 /* Receive packet directly if conditions permit */
2141 tipc_node_read_lock(n);
2142 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
2143 spin_lock_bh(&le->lock);
2144 if (le->link) {
2145 rc = tipc_link_rcv(le->link, skb, &xmitq);
2146 skb = NULL;
2147 }
2148 spin_unlock_bh(&le->lock);
2149 }
2150 tipc_node_read_unlock(n);
2151
2152 /* Check/update node state before receiving */
2153 if (unlikely(skb)) {
2154 if (unlikely(skb_linearize(skb)))
2155 goto out_node_put;
2156 tipc_node_write_lock(n);
2157 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
2158 if (le->link) {
2159 rc = tipc_link_rcv(le->link, skb, &xmitq);
2160 skb = NULL;
2161 }
2162 }
2163 tipc_node_write_unlock(n);
2164 }
2165
2166 if (unlikely(rc & TIPC_LINK_UP_EVT))
2167 tipc_node_link_up(n, bearer_id, &xmitq);
2168
2169 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
2170 tipc_node_link_down(n, bearer_id, false);
2171
2172 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
2173 tipc_named_rcv(net, &n->bc_entry.namedq,
2174 &n->bc_entry.named_rcv_nxt,
2175 &n->bc_entry.named_open);
2176
2177 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
2178 tipc_node_mcast_rcv(n);
2179
2180 if (!skb_queue_empty(&le->inputq))
2181 tipc_sk_rcv(net, &le->inputq);
2182
2183 if (!skb_queue_empty(&xmitq))
2184 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
2185
2186out_node_put:
2187 tipc_node_put(n);
2188discard:
2189 kfree_skb(skb);
2190}
2191
2192void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
2193 int prop)
2194{
2195 struct tipc_net *tn = tipc_net(net);
2196 int bearer_id = b->identity;
2197 struct sk_buff_head xmitq;
2198 struct tipc_link_entry *e;
2199 struct tipc_node *n;
2200
2201 __skb_queue_head_init(&xmitq);
2202
2203 rcu_read_lock();
2204
2205 list_for_each_entry_rcu(n, &tn->node_list, list) {
2206 tipc_node_write_lock(n);
2207 e = &n->links[bearer_id];
2208 if (e->link) {
2209 if (prop == TIPC_NLA_PROP_TOL)
2210 tipc_link_set_tolerance(e->link, b->tolerance,
2211 &xmitq);
2212 else if (prop == TIPC_NLA_PROP_MTU)
2213 tipc_link_set_mtu(e->link, b->mtu);
2214
2215 /* Update MTU for node link entry */
2216 e->mtu = tipc_link_mss(e->link);
2217 }
2218
2219 tipc_node_write_unlock(n);
2220 tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
2221 }
2222
2223 rcu_read_unlock();
2224}
2225
2226int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
2227{
2228 struct net *net = sock_net(skb->sk);
2229 struct tipc_net *tn = net_generic(net, tipc_net_id);
2230 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
2231 struct tipc_node *peer, *temp_node;
2232 u8 node_id[NODE_ID_LEN];
2233 u64 *w0 = (u64 *)&node_id[0];
2234 u64 *w1 = (u64 *)&node_id[8];
2235 u32 addr;
2236 int err;
2237
2238 /* We identify the peer by its net */
2239 if (!info->attrs[TIPC_NLA_NET])
2240 return -EINVAL;
2241
2242 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
2243 info->attrs[TIPC_NLA_NET],
2244 tipc_nl_net_policy, info->extack);
2245 if (err)
2246 return err;
2247
2248 /* attrs[TIPC_NLA_NET_NODEID] and attrs[TIPC_NLA_NET_ADDR] are
2249 * mutually exclusive cases
2250 */
2251 if (attrs[TIPC_NLA_NET_ADDR]) {
2252 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
2253 if (!addr)
2254 return -EINVAL;
2255 }
2256
2257 if (attrs[TIPC_NLA_NET_NODEID]) {
2258 if (!attrs[TIPC_NLA_NET_NODEID_W1])
2259 return -EINVAL;
2260 *w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
2261 *w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
2262 addr = hash128to32(node_id);
2263 }
2264
2265 if (in_own_node(net, addr))
2266 return -ENOTSUPP;
2267
2268 spin_lock_bh(&tn->node_list_lock);
2269 peer = tipc_node_find(net, addr);
2270 if (!peer) {
2271 spin_unlock_bh(&tn->node_list_lock);
2272 return -ENXIO;
2273 }
2274
2275 tipc_node_write_lock(peer);
2276 if (peer->state != SELF_DOWN_PEER_DOWN &&
2277 peer->state != SELF_DOWN_PEER_LEAVING) {
2278 tipc_node_write_unlock(peer);
2279 err = -EBUSY;
2280 goto err_out;
2281 }
2282
2283 tipc_node_clear_links(peer);
2284 tipc_node_write_unlock(peer);
2285 tipc_node_delete(peer);
2286
2287 /* Calculate cluster capabilities */
2288 tn->capabilities = TIPC_NODE_CAPABILITIES;
2289 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
2290 tn->capabilities &= temp_node->capabilities;
2291 }
2292 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
2293 err = 0;
2294err_out:
2295 tipc_node_put(peer);
2296 spin_unlock_bh(&tn->node_list_lock);
2297
2298 return err;
2299}
2300
2301int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
2302{
2303 int err;
2304 struct net *net = sock_net(skb->sk);
2305 struct tipc_net *tn = net_generic(net, tipc_net_id);
2306 int done = cb->args[0];
2307 int last_addr = cb->args[1];
2308 struct tipc_node *node;
2309 struct tipc_nl_msg msg;
2310
2311 if (done)
2312 return 0;
2313
2314 msg.skb = skb;
2315 msg.portid = NETLINK_CB(cb->skb).portid;
2316 msg.seq = cb->nlh->nlmsg_seq;
2317
2318 rcu_read_lock();
2319 if (last_addr) {
2320 node = tipc_node_find(net, last_addr);
2321 if (!node) {
2322 rcu_read_unlock();
2323 /* We never set seq or call nl_dump_check_consistent()
2324 * this means that setting prev_seq here will cause the
2325 * consistence check to fail in the netlink callback
2326 * handler. Resulting in the NLMSG_DONE message having
2327 * the NLM_F_DUMP_INTR flag set if the node state
2328 * changed while we released the lock.
2329 */
2330 cb->prev_seq = 1;
2331 return -EPIPE;
2332 }
2333 tipc_node_put(node);
2334 }
2335
2336 list_for_each_entry_rcu(node, &tn->node_list, list) {
2337 if (node->preliminary)
2338 continue;
2339 if (last_addr) {
2340 if (node->addr == last_addr)
2341 last_addr = 0;
2342 else
2343 continue;
2344 }
2345
2346 tipc_node_read_lock(node);
2347 err = __tipc_nl_add_node(&msg, node);
2348 if (err) {
2349 last_addr = node->addr;
2350 tipc_node_read_unlock(node);
2351 goto out;
2352 }
2353
2354 tipc_node_read_unlock(node);
2355 }
2356 done = 1;
2357out:
2358 cb->args[0] = done;
2359 cb->args[1] = last_addr;
2360 rcu_read_unlock();
2361
2362 return skb->len;
2363}
2364
2365/* tipc_node_find_by_name - locate owner node of link by link's name
2366 * @net: the applicable net namespace
2367 * @name: pointer to link name string
2368 * @bearer_id: pointer to index in 'node->links' array where the link was found.
2369 *
2370 * Returns pointer to node owning the link, or 0 if no matching link is found.
2371 */
2372static struct tipc_node *tipc_node_find_by_name(struct net *net,
2373 const char *link_name,
2374 unsigned int *bearer_id)
2375{
2376 struct tipc_net *tn = net_generic(net, tipc_net_id);
2377 struct tipc_link *l;
2378 struct tipc_node *n;
2379 struct tipc_node *found_node = NULL;
2380 int i;
2381
2382 *bearer_id = 0;
2383 rcu_read_lock();
2384 list_for_each_entry_rcu(n, &tn->node_list, list) {
2385 tipc_node_read_lock(n);
2386 for (i = 0; i < MAX_BEARERS; i++) {
2387 l = n->links[i].link;
2388 if (l && !strcmp(tipc_link_name(l), link_name)) {
2389 *bearer_id = i;
2390 found_node = n;
2391 break;
2392 }
2393 }
2394 tipc_node_read_unlock(n);
2395 if (found_node)
2396 break;
2397 }
2398 rcu_read_unlock();
2399
2400 return found_node;
2401}
2402
2403int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
2404{
2405 int err;
2406 int res = 0;
2407 int bearer_id;
2408 char *name;
2409 struct tipc_link *link;
2410 struct tipc_node *node;
2411 struct sk_buff_head xmitq;
2412 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2413 struct net *net = sock_net(skb->sk);
2414
2415 __skb_queue_head_init(&xmitq);
2416
2417 if (!info->attrs[TIPC_NLA_LINK])
2418 return -EINVAL;
2419
2420 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2421 info->attrs[TIPC_NLA_LINK],
2422 tipc_nl_link_policy, info->extack);
2423 if (err)
2424 return err;
2425
2426 if (!attrs[TIPC_NLA_LINK_NAME])
2427 return -EINVAL;
2428
2429 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2430
2431 if (strcmp(name, tipc_bclink_name) == 0)
2432 return tipc_nl_bc_link_set(net, attrs);
2433
2434 node = tipc_node_find_by_name(net, name, &bearer_id);
2435 if (!node)
2436 return -EINVAL;
2437
2438 tipc_node_read_lock(node);
2439
2440 link = node->links[bearer_id].link;
2441 if (!link) {
2442 res = -EINVAL;
2443 goto out;
2444 }
2445
2446 if (attrs[TIPC_NLA_LINK_PROP]) {
2447 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2448
2449 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
2450 if (err) {
2451 res = err;
2452 goto out;
2453 }
2454
2455 if (props[TIPC_NLA_PROP_TOL]) {
2456 u32 tol;
2457
2458 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2459 tipc_link_set_tolerance(link, tol, &xmitq);
2460 }
2461 if (props[TIPC_NLA_PROP_PRIO]) {
2462 u32 prio;
2463
2464 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2465 tipc_link_set_prio(link, prio, &xmitq);
2466 }
2467 if (props[TIPC_NLA_PROP_WIN]) {
2468 u32 max_win;
2469
2470 max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2471 tipc_link_set_queue_limits(link,
2472 tipc_link_min_win(link),
2473 max_win);
2474 }
2475 }
2476
2477out:
2478 tipc_node_read_unlock(node);
2479 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr,
2480 NULL);
2481 return res;
2482}
2483
2484int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
2485{
2486 struct net *net = genl_info_net(info);
2487 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2488 struct tipc_nl_msg msg;
2489 char *name;
2490 int err;
2491
2492 msg.portid = info->snd_portid;
2493 msg.seq = info->snd_seq;
2494
2495 if (!info->attrs[TIPC_NLA_LINK])
2496 return -EINVAL;
2497
2498 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2499 info->attrs[TIPC_NLA_LINK],
2500 tipc_nl_link_policy, info->extack);
2501 if (err)
2502 return err;
2503
2504 if (!attrs[TIPC_NLA_LINK_NAME])
2505 return -EINVAL;
2506
2507 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2508
2509 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2510 if (!msg.skb)
2511 return -ENOMEM;
2512
2513 if (strcmp(name, tipc_bclink_name) == 0) {
2514 err = tipc_nl_add_bc_link(net, &msg, tipc_net(net)->bcl);
2515 if (err)
2516 goto err_free;
2517 } else {
2518 int bearer_id;
2519 struct tipc_node *node;
2520 struct tipc_link *link;
2521
2522 node = tipc_node_find_by_name(net, name, &bearer_id);
2523 if (!node) {
2524 err = -EINVAL;
2525 goto err_free;
2526 }
2527
2528 tipc_node_read_lock(node);
2529 link = node->links[bearer_id].link;
2530 if (!link) {
2531 tipc_node_read_unlock(node);
2532 err = -EINVAL;
2533 goto err_free;
2534 }
2535
2536 err = __tipc_nl_add_link(net, &msg, link, 0);
2537 tipc_node_read_unlock(node);
2538 if (err)
2539 goto err_free;
2540 }
2541
2542 return genlmsg_reply(msg.skb, info);
2543
2544err_free:
2545 nlmsg_free(msg.skb);
2546 return err;
2547}
2548
2549int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2550{
2551 int err;
2552 char *link_name;
2553 unsigned int bearer_id;
2554 struct tipc_link *link;
2555 struct tipc_node *node;
2556 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2557 struct net *net = sock_net(skb->sk);
2558 struct tipc_net *tn = tipc_net(net);
2559 struct tipc_link_entry *le;
2560
2561 if (!info->attrs[TIPC_NLA_LINK])
2562 return -EINVAL;
2563
2564 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2565 info->attrs[TIPC_NLA_LINK],
2566 tipc_nl_link_policy, info->extack);
2567 if (err)
2568 return err;
2569
2570 if (!attrs[TIPC_NLA_LINK_NAME])
2571 return -EINVAL;
2572
2573 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2574
2575 err = -EINVAL;
2576 if (!strcmp(link_name, tipc_bclink_name)) {
2577 err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
2578 if (err)
2579 return err;
2580 return 0;
2581 } else if (strstr(link_name, tipc_bclink_name)) {
2582 rcu_read_lock();
2583 list_for_each_entry_rcu(node, &tn->node_list, list) {
2584 tipc_node_read_lock(node);
2585 link = node->bc_entry.link;
2586 if (link && !strcmp(link_name, tipc_link_name(link))) {
2587 err = tipc_bclink_reset_stats(net, link);
2588 tipc_node_read_unlock(node);
2589 break;
2590 }
2591 tipc_node_read_unlock(node);
2592 }
2593 rcu_read_unlock();
2594 return err;
2595 }
2596
2597 node = tipc_node_find_by_name(net, link_name, &bearer_id);
2598 if (!node)
2599 return -EINVAL;
2600
2601 le = &node->links[bearer_id];
2602 tipc_node_read_lock(node);
2603 spin_lock_bh(&le->lock);
2604 link = node->links[bearer_id].link;
2605 if (!link) {
2606 spin_unlock_bh(&le->lock);
2607 tipc_node_read_unlock(node);
2608 return -EINVAL;
2609 }
2610 tipc_link_reset_stats(link);
2611 spin_unlock_bh(&le->lock);
2612 tipc_node_read_unlock(node);
2613 return 0;
2614}
2615
2616/* Caller should hold node lock */
2617static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2618 struct tipc_node *node, u32 *prev_link,
2619 bool bc_link)
2620{
2621 u32 i;
2622 int err;
2623
2624 for (i = *prev_link; i < MAX_BEARERS; i++) {
2625 *prev_link = i;
2626
2627 if (!node->links[i].link)
2628 continue;
2629
2630 err = __tipc_nl_add_link(net, msg,
2631 node->links[i].link, NLM_F_MULTI);
2632 if (err)
2633 return err;
2634 }
2635
2636 if (bc_link) {
2637 *prev_link = i;
2638 err = tipc_nl_add_bc_link(net, msg, node->bc_entry.link);
2639 if (err)
2640 return err;
2641 }
2642
2643 *prev_link = 0;
2644
2645 return 0;
2646}
2647
2648int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2649{
2650 struct net *net = sock_net(skb->sk);
2651 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
2652 struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
2653 struct tipc_net *tn = net_generic(net, tipc_net_id);
2654 struct tipc_node *node;
2655 struct tipc_nl_msg msg;
2656 u32 prev_node = cb->args[0];
2657 u32 prev_link = cb->args[1];
2658 int done = cb->args[2];
2659 bool bc_link = cb->args[3];
2660 int err;
2661
2662 if (done)
2663 return 0;
2664
2665 if (!prev_node) {
2666 /* Check if broadcast-receiver links dumping is needed */
2667 if (attrs && attrs[TIPC_NLA_LINK]) {
2668 err = nla_parse_nested_deprecated(link,
2669 TIPC_NLA_LINK_MAX,
2670 attrs[TIPC_NLA_LINK],
2671 tipc_nl_link_policy,
2672 NULL);
2673 if (unlikely(err))
2674 return err;
2675 if (unlikely(!link[TIPC_NLA_LINK_BROADCAST]))
2676 return -EINVAL;
2677 bc_link = true;
2678 }
2679 }
2680
2681 msg.skb = skb;
2682 msg.portid = NETLINK_CB(cb->skb).portid;
2683 msg.seq = cb->nlh->nlmsg_seq;
2684
2685 rcu_read_lock();
2686 if (prev_node) {
2687 node = tipc_node_find(net, prev_node);
2688 if (!node) {
2689 /* We never set seq or call nl_dump_check_consistent()
2690 * this means that setting prev_seq here will cause the
2691 * consistence check to fail in the netlink callback
2692 * handler. Resulting in the last NLMSG_DONE message
2693 * having the NLM_F_DUMP_INTR flag set.
2694 */
2695 cb->prev_seq = 1;
2696 goto out;
2697 }
2698 tipc_node_put(node);
2699
2700 list_for_each_entry_continue_rcu(node, &tn->node_list,
2701 list) {
2702 tipc_node_read_lock(node);
2703 err = __tipc_nl_add_node_links(net, &msg, node,
2704 &prev_link, bc_link);
2705 tipc_node_read_unlock(node);
2706 if (err)
2707 goto out;
2708
2709 prev_node = node->addr;
2710 }
2711 } else {
2712 err = tipc_nl_add_bc_link(net, &msg, tn->bcl);
2713 if (err)
2714 goto out;
2715
2716 list_for_each_entry_rcu(node, &tn->node_list, list) {
2717 tipc_node_read_lock(node);
2718 err = __tipc_nl_add_node_links(net, &msg, node,
2719 &prev_link, bc_link);
2720 tipc_node_read_unlock(node);
2721 if (err)
2722 goto out;
2723
2724 prev_node = node->addr;
2725 }
2726 }
2727 done = 1;
2728out:
2729 rcu_read_unlock();
2730
2731 cb->args[0] = prev_node;
2732 cb->args[1] = prev_link;
2733 cb->args[2] = done;
2734 cb->args[3] = bc_link;
2735
2736 return skb->len;
2737}
2738
2739int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2740{
2741 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2742 struct net *net = sock_net(skb->sk);
2743 int err;
2744
2745 if (!info->attrs[TIPC_NLA_MON])
2746 return -EINVAL;
2747
2748 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
2749 info->attrs[TIPC_NLA_MON],
2750 tipc_nl_monitor_policy,
2751 info->extack);
2752 if (err)
2753 return err;
2754
2755 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2756 u32 val;
2757
2758 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2759 err = tipc_nl_monitor_set_threshold(net, val);
2760 if (err)
2761 return err;
2762 }
2763
2764 return 0;
2765}
2766
2767static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2768{
2769 struct nlattr *attrs;
2770 void *hdr;
2771 u32 val;
2772
2773 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2774 0, TIPC_NL_MON_GET);
2775 if (!hdr)
2776 return -EMSGSIZE;
2777
2778 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
2779 if (!attrs)
2780 goto msg_full;
2781
2782 val = tipc_nl_monitor_get_threshold(net);
2783
2784 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2785 goto attr_msg_full;
2786
2787 nla_nest_end(msg->skb, attrs);
2788 genlmsg_end(msg->skb, hdr);
2789
2790 return 0;
2791
2792attr_msg_full:
2793 nla_nest_cancel(msg->skb, attrs);
2794msg_full:
2795 genlmsg_cancel(msg->skb, hdr);
2796
2797 return -EMSGSIZE;
2798}
2799
2800int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2801{
2802 struct net *net = sock_net(skb->sk);
2803 struct tipc_nl_msg msg;
2804 int err;
2805
2806 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2807 if (!msg.skb)
2808 return -ENOMEM;
2809 msg.portid = info->snd_portid;
2810 msg.seq = info->snd_seq;
2811
2812 err = __tipc_nl_add_monitor_prop(net, &msg);
2813 if (err) {
2814 nlmsg_free(msg.skb);
2815 return err;
2816 }
2817
2818 return genlmsg_reply(msg.skb, info);
2819}
2820
2821int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2822{
2823 struct net *net = sock_net(skb->sk);
2824 u32 prev_bearer = cb->args[0];
2825 struct tipc_nl_msg msg;
2826 int bearer_id;
2827 int err;
2828
2829 if (prev_bearer == MAX_BEARERS)
2830 return 0;
2831
2832 msg.skb = skb;
2833 msg.portid = NETLINK_CB(cb->skb).portid;
2834 msg.seq = cb->nlh->nlmsg_seq;
2835
2836 rtnl_lock();
2837 for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2838 err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2839 if (err)
2840 break;
2841 }
2842 rtnl_unlock();
2843 cb->args[0] = bearer_id;
2844
2845 return skb->len;
2846}
2847
2848int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2849 struct netlink_callback *cb)
2850{
2851 struct net *net = sock_net(skb->sk);
2852 u32 prev_node = cb->args[1];
2853 u32 bearer_id = cb->args[2];
2854 int done = cb->args[0];
2855 struct tipc_nl_msg msg;
2856 int err;
2857
2858 if (!prev_node) {
2859 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
2860 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2861
2862 if (!attrs[TIPC_NLA_MON])
2863 return -EINVAL;
2864
2865 err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
2866 attrs[TIPC_NLA_MON],
2867 tipc_nl_monitor_policy,
2868 NULL);
2869 if (err)
2870 return err;
2871
2872 if (!mon[TIPC_NLA_MON_REF])
2873 return -EINVAL;
2874
2875 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2876
2877 if (bearer_id >= MAX_BEARERS)
2878 return -EINVAL;
2879 }
2880
2881 if (done)
2882 return 0;
2883
2884 msg.skb = skb;
2885 msg.portid = NETLINK_CB(cb->skb).portid;
2886 msg.seq = cb->nlh->nlmsg_seq;
2887
2888 rtnl_lock();
2889 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2890 if (!err)
2891 done = 1;
2892
2893 rtnl_unlock();
2894 cb->args[0] = done;
2895 cb->args[1] = prev_node;
2896 cb->args[2] = bearer_id;
2897
2898 return skb->len;
2899}
2900
2901#ifdef CONFIG_TIPC_CRYPTO
2902static int tipc_nl_retrieve_key(struct nlattr **attrs,
2903 struct tipc_aead_key **pkey)
2904{
2905 struct nlattr *attr = attrs[TIPC_NLA_NODE_KEY];
2906 struct tipc_aead_key *key;
2907
2908 if (!attr)
2909 return -ENODATA;
2910
2911 if (nla_len(attr) < sizeof(*key))
2912 return -EINVAL;
2913 key = (struct tipc_aead_key *)nla_data(attr);
2914 if (key->keylen > TIPC_AEAD_KEYLEN_MAX ||
2915 nla_len(attr) < tipc_aead_key_size(key))
2916 return -EINVAL;
2917
2918 *pkey = key;
2919 return 0;
2920}
2921
2922static int tipc_nl_retrieve_nodeid(struct nlattr **attrs, u8 **node_id)
2923{
2924 struct nlattr *attr = attrs[TIPC_NLA_NODE_ID];
2925
2926 if (!attr)
2927 return -ENODATA;
2928
2929 if (nla_len(attr) < TIPC_NODEID_LEN)
2930 return -EINVAL;
2931
2932 *node_id = (u8 *)nla_data(attr);
2933 return 0;
2934}
2935
2936static int tipc_nl_retrieve_rekeying(struct nlattr **attrs, u32 *intv)
2937{
2938 struct nlattr *attr = attrs[TIPC_NLA_NODE_REKEYING];
2939
2940 if (!attr)
2941 return -ENODATA;
2942
2943 *intv = nla_get_u32(attr);
2944 return 0;
2945}
2946
2947static int __tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
2948{
2949 struct nlattr *attrs[TIPC_NLA_NODE_MAX + 1];
2950 struct net *net = sock_net(skb->sk);
2951 struct tipc_crypto *tx = tipc_net(net)->crypto_tx, *c = tx;
2952 struct tipc_node *n = NULL;
2953 struct tipc_aead_key *ukey;
2954 bool rekeying = true, master_key = false;
2955 u8 *id, *own_id, mode;
2956 u32 intv = 0;
2957 int rc = 0;
2958
2959 if (!info->attrs[TIPC_NLA_NODE])
2960 return -EINVAL;
2961
2962 rc = nla_parse_nested(attrs, TIPC_NLA_NODE_MAX,
2963 info->attrs[TIPC_NLA_NODE],
2964 tipc_nl_node_policy, info->extack);
2965 if (rc)
2966 return rc;
2967
2968 own_id = tipc_own_id(net);
2969 if (!own_id) {
2970 GENL_SET_ERR_MSG(info, "not found own node identity (set id?)");
2971 return -EPERM;
2972 }
2973
2974 rc = tipc_nl_retrieve_rekeying(attrs, &intv);
2975 if (rc == -ENODATA)
2976 rekeying = false;
2977
2978 rc = tipc_nl_retrieve_key(attrs, &ukey);
2979 if (rc == -ENODATA && rekeying)
2980 goto rekeying;
2981 else if (rc)
2982 return rc;
2983
2984 rc = tipc_aead_key_validate(ukey, info);
2985 if (rc)
2986 return rc;
2987
2988 rc = tipc_nl_retrieve_nodeid(attrs, &id);
2989 switch (rc) {
2990 case -ENODATA:
2991 mode = CLUSTER_KEY;
2992 master_key = !!(attrs[TIPC_NLA_NODE_KEY_MASTER]);
2993 break;
2994 case 0:
2995 mode = PER_NODE_KEY;
2996 if (memcmp(id, own_id, NODE_ID_LEN)) {
2997 n = tipc_node_find_by_id(net, id) ?:
2998 tipc_node_create(net, 0, id, 0xffffu, 0, true);
2999 if (unlikely(!n))
3000 return -ENOMEM;
3001 c = n->crypto_rx;
3002 }
3003 break;
3004 default:
3005 return rc;
3006 }
3007
3008 /* Initiate the TX/RX key */
3009 rc = tipc_crypto_key_init(c, ukey, mode, master_key);
3010 if (n)
3011 tipc_node_put(n);
3012
3013 if (unlikely(rc < 0)) {
3014 GENL_SET_ERR_MSG(info, "unable to initiate or attach new key");
3015 return rc;
3016 } else if (c == tx) {
3017 /* Distribute TX key but not master one */
3018 if (!master_key && tipc_crypto_key_distr(tx, rc, NULL))
3019 GENL_SET_ERR_MSG(info, "failed to replicate new key");
3020rekeying:
3021 /* Schedule TX rekeying if needed */
3022 tipc_crypto_rekeying_sched(tx, rekeying, intv);
3023 }
3024
3025 return 0;
3026}
3027
3028int tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
3029{
3030 int err;
3031
3032 rtnl_lock();
3033 err = __tipc_nl_node_set_key(skb, info);
3034 rtnl_unlock();
3035
3036 return err;
3037}
3038
3039static int __tipc_nl_node_flush_key(struct sk_buff *skb,
3040 struct genl_info *info)
3041{
3042 struct net *net = sock_net(skb->sk);
3043 struct tipc_net *tn = tipc_net(net);
3044 struct tipc_node *n;
3045
3046 tipc_crypto_key_flush(tn->crypto_tx);
3047 rcu_read_lock();
3048 list_for_each_entry_rcu(n, &tn->node_list, list)
3049 tipc_crypto_key_flush(n->crypto_rx);
3050 rcu_read_unlock();
3051
3052 return 0;
3053}
3054
3055int tipc_nl_node_flush_key(struct sk_buff *skb, struct genl_info *info)
3056{
3057 int err;
3058
3059 rtnl_lock();
3060 err = __tipc_nl_node_flush_key(skb, info);
3061 rtnl_unlock();
3062
3063 return err;
3064}
3065#endif
3066
3067/**
3068 * tipc_node_dump - dump TIPC node data
3069 * @n: tipc node to be dumped
3070 * @more: dump more?
3071 * - false: dump only tipc node data
3072 * - true: dump node link data as well
3073 * @buf: returned buffer of dump data in format
3074 */
3075int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
3076{
3077 int i = 0;
3078 size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
3079
3080 if (!n) {
3081 i += scnprintf(buf, sz, "node data: (null)\n");
3082 return i;
3083 }
3084
3085 i += scnprintf(buf, sz, "node data: %x", n->addr);
3086 i += scnprintf(buf + i, sz - i, " %x", n->state);
3087 i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
3088 i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
3089 i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
3090 i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
3091 i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
3092 i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
3093 i += scnprintf(buf + i, sz - i, " %u", n->working_links);
3094 i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
3095 i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
3096
3097 if (!more)
3098 return i;
3099
3100 i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
3101 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
3102 i += scnprintf(buf + i, sz - i, " media: ");
3103 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
3104 i += scnprintf(buf + i, sz - i, "\n");
3105 i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
3106 i += scnprintf(buf + i, sz - i, " inputq: ");
3107 i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
3108
3109 i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
3110 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
3111 i += scnprintf(buf + i, sz - i, " media: ");
3112 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
3113 i += scnprintf(buf + i, sz - i, "\n");
3114 i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
3115 i += scnprintf(buf + i, sz - i, " inputq: ");
3116 i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
3117
3118 i += scnprintf(buf + i, sz - i, "bclink:\n ");
3119 i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
3120
3121 return i;
3122}
3123
3124void tipc_node_pre_cleanup_net(struct net *exit_net)
3125{
3126 struct tipc_node *n;
3127 struct tipc_net *tn;
3128 struct net *tmp;
3129
3130 rcu_read_lock();
3131 for_each_net_rcu(tmp) {
3132 if (tmp == exit_net)
3133 continue;
3134 tn = tipc_net(tmp);
3135 if (!tn)
3136 continue;
3137 spin_lock_bh(&tn->node_list_lock);
3138 list_for_each_entry_rcu(n, &tn->node_list, list) {
3139 if (!n->peer_net)
3140 continue;
3141 if (n->peer_net != exit_net)
3142 continue;
3143 tipc_node_write_lock(n);
3144 n->peer_net = NULL;
3145 n->peer_hash_mix = 0;
3146 tipc_node_write_unlock_fast(n);
3147 break;
3148 }
3149 spin_unlock_bh(&tn->node_list_lock);
3150 }
3151 rcu_read_unlock();
3152}
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
47#define INVALID_NODE_SIG 0x10000
48
49/* Flags used to take different actions according to flag type
50 * TIPC_NOTIFY_NODE_DOWN: notify node is down
51 * TIPC_NOTIFY_NODE_UP: notify node is up
52 * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
53 */
54enum {
55 TIPC_NOTIFY_NODE_DOWN = (1 << 3),
56 TIPC_NOTIFY_NODE_UP = (1 << 4),
57 TIPC_NOTIFY_LINK_UP = (1 << 6),
58 TIPC_NOTIFY_LINK_DOWN = (1 << 7)
59};
60
61struct tipc_link_entry {
62 struct tipc_link *link;
63 spinlock_t lock; /* per link */
64 u32 mtu;
65 struct sk_buff_head inputq;
66 struct tipc_media_addr maddr;
67};
68
69struct tipc_bclink_entry {
70 struct tipc_link *link;
71 struct sk_buff_head inputq1;
72 struct sk_buff_head arrvq;
73 struct sk_buff_head inputq2;
74 struct sk_buff_head namedq;
75};
76
77/**
78 * struct tipc_node - TIPC node structure
79 * @addr: network address of node
80 * @ref: reference counter to node object
81 * @lock: rwlock governing access to structure
82 * @net: the applicable net namespace
83 * @hash: links to adjacent nodes in unsorted hash chain
84 * @inputq: pointer to input queue containing messages for msg event
85 * @namedq: pointer to name table input queue with name table messages
86 * @active_links: bearer ids of active links, used as index into links[] array
87 * @links: array containing references to all links to node
88 * @action_flags: bit mask of different types of node actions
89 * @state: connectivity state vs peer node
90 * @sync_point: sequence number where synch/failover is finished
91 * @list: links to adjacent nodes in sorted list of cluster's nodes
92 * @working_links: number of working links to node (both active and standby)
93 * @link_cnt: number of links to node
94 * @capabilities: bitmap, indicating peer node's functional capabilities
95 * @signature: node instance identifier
96 * @link_id: local and remote bearer ids of changing link, if any
97 * @publ_list: list of publications
98 * @rcu: rcu struct for tipc_node
99 */
100struct tipc_node {
101 u32 addr;
102 struct kref kref;
103 rwlock_t lock;
104 struct net *net;
105 struct hlist_node hash;
106 int active_links[2];
107 struct tipc_link_entry links[MAX_BEARERS];
108 struct tipc_bclink_entry bc_entry;
109 int action_flags;
110 struct list_head list;
111 int state;
112 u16 sync_point;
113 int link_cnt;
114 u16 working_links;
115 u16 capabilities;
116 u32 signature;
117 u32 link_id;
118 struct list_head publ_list;
119 struct list_head conn_sks;
120 unsigned long keepalive_intv;
121 struct timer_list timer;
122 struct rcu_head rcu;
123};
124
125/* Node FSM states and events:
126 */
127enum {
128 SELF_DOWN_PEER_DOWN = 0xdd,
129 SELF_UP_PEER_UP = 0xaa,
130 SELF_DOWN_PEER_LEAVING = 0xd1,
131 SELF_UP_PEER_COMING = 0xac,
132 SELF_COMING_PEER_UP = 0xca,
133 SELF_LEAVING_PEER_DOWN = 0x1d,
134 NODE_FAILINGOVER = 0xf0,
135 NODE_SYNCHING = 0xcc
136};
137
138enum {
139 SELF_ESTABL_CONTACT_EVT = 0xece,
140 SELF_LOST_CONTACT_EVT = 0x1ce,
141 PEER_ESTABL_CONTACT_EVT = 0x9ece,
142 PEER_LOST_CONTACT_EVT = 0x91ce,
143 NODE_FAILOVER_BEGIN_EVT = 0xfbe,
144 NODE_FAILOVER_END_EVT = 0xfee,
145 NODE_SYNCH_BEGIN_EVT = 0xcbe,
146 NODE_SYNCH_END_EVT = 0xcee
147};
148
149static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
150 struct sk_buff_head *xmitq,
151 struct tipc_media_addr **maddr);
152static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
153 bool delete);
154static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
155static void tipc_node_delete(struct tipc_node *node);
156static void tipc_node_timeout(unsigned long data);
157static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
158static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
159static void tipc_node_put(struct tipc_node *node);
160static bool tipc_node_is_up(struct tipc_node *n);
161
162struct tipc_sock_conn {
163 u32 port;
164 u32 peer_port;
165 u32 peer_node;
166 struct list_head list;
167};
168
169static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
170{
171 int bearer_id = n->active_links[sel & 1];
172
173 if (unlikely(bearer_id == INVALID_BEARER_ID))
174 return NULL;
175
176 return n->links[bearer_id].link;
177}
178
179int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel)
180{
181 struct tipc_node *n;
182 int bearer_id;
183 unsigned int mtu = MAX_MSG_SIZE;
184
185 n = tipc_node_find(net, addr);
186 if (unlikely(!n))
187 return mtu;
188
189 bearer_id = n->active_links[sel & 1];
190 if (likely(bearer_id != INVALID_BEARER_ID))
191 mtu = n->links[bearer_id].mtu;
192 tipc_node_put(n);
193 return mtu;
194}
195
196u16 tipc_node_get_capabilities(struct net *net, u32 addr)
197{
198 struct tipc_node *n;
199 u16 caps;
200
201 n = tipc_node_find(net, addr);
202 if (unlikely(!n))
203 return TIPC_NODE_CAPABILITIES;
204 caps = n->capabilities;
205 tipc_node_put(n);
206 return caps;
207}
208
209static void tipc_node_kref_release(struct kref *kref)
210{
211 struct tipc_node *n = container_of(kref, struct tipc_node, kref);
212
213 kfree(n->bc_entry.link);
214 kfree_rcu(n, rcu);
215}
216
217static void tipc_node_put(struct tipc_node *node)
218{
219 kref_put(&node->kref, tipc_node_kref_release);
220}
221
222static void tipc_node_get(struct tipc_node *node)
223{
224 kref_get(&node->kref);
225}
226
227/*
228 * tipc_node_find - locate specified node object, if it exists
229 */
230static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
231{
232 struct tipc_net *tn = tipc_net(net);
233 struct tipc_node *node;
234 unsigned int thash = tipc_hashfn(addr);
235
236 if (unlikely(!in_own_cluster_exact(net, addr)))
237 return NULL;
238
239 rcu_read_lock();
240 hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
241 if (node->addr != addr)
242 continue;
243 if (!kref_get_unless_zero(&node->kref))
244 node = NULL;
245 break;
246 }
247 rcu_read_unlock();
248 return node;
249}
250
251static void tipc_node_read_lock(struct tipc_node *n)
252{
253 read_lock_bh(&n->lock);
254}
255
256static void tipc_node_read_unlock(struct tipc_node *n)
257{
258 read_unlock_bh(&n->lock);
259}
260
261static void tipc_node_write_lock(struct tipc_node *n)
262{
263 write_lock_bh(&n->lock);
264}
265
266static void tipc_node_write_unlock_fast(struct tipc_node *n)
267{
268 write_unlock_bh(&n->lock);
269}
270
271static void tipc_node_write_unlock(struct tipc_node *n)
272{
273 struct net *net = n->net;
274 u32 addr = 0;
275 u32 flags = n->action_flags;
276 u32 link_id = 0;
277 u32 bearer_id;
278 struct list_head *publ_list;
279
280 if (likely(!flags)) {
281 write_unlock_bh(&n->lock);
282 return;
283 }
284
285 addr = n->addr;
286 link_id = n->link_id;
287 bearer_id = link_id & 0xffff;
288 publ_list = &n->publ_list;
289
290 n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
291 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
292
293 write_unlock_bh(&n->lock);
294
295 if (flags & TIPC_NOTIFY_NODE_DOWN)
296 tipc_publ_notify(net, publ_list, addr);
297
298 if (flags & TIPC_NOTIFY_NODE_UP)
299 tipc_named_node_up(net, addr);
300
301 if (flags & TIPC_NOTIFY_LINK_UP) {
302 tipc_mon_peer_up(net, addr, bearer_id);
303 tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
304 TIPC_NODE_SCOPE, link_id, addr);
305 }
306 if (flags & TIPC_NOTIFY_LINK_DOWN) {
307 tipc_mon_peer_down(net, addr, bearer_id);
308 tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
309 link_id, addr);
310 }
311}
312
313struct tipc_node *tipc_node_create(struct net *net, u32 addr, u16 capabilities)
314{
315 struct tipc_net *tn = net_generic(net, tipc_net_id);
316 struct tipc_node *n, *temp_node;
317 int i;
318
319 spin_lock_bh(&tn->node_list_lock);
320 n = tipc_node_find(net, addr);
321 if (n) {
322 /* Same node may come back with new capabilities */
323 n->capabilities = capabilities;
324 goto exit;
325 }
326 n = kzalloc(sizeof(*n), GFP_ATOMIC);
327 if (!n) {
328 pr_warn("Node creation failed, no memory\n");
329 goto exit;
330 }
331 n->addr = addr;
332 n->net = net;
333 n->capabilities = capabilities;
334 kref_init(&n->kref);
335 rwlock_init(&n->lock);
336 INIT_HLIST_NODE(&n->hash);
337 INIT_LIST_HEAD(&n->list);
338 INIT_LIST_HEAD(&n->publ_list);
339 INIT_LIST_HEAD(&n->conn_sks);
340 skb_queue_head_init(&n->bc_entry.namedq);
341 skb_queue_head_init(&n->bc_entry.inputq1);
342 __skb_queue_head_init(&n->bc_entry.arrvq);
343 skb_queue_head_init(&n->bc_entry.inputq2);
344 for (i = 0; i < MAX_BEARERS; i++)
345 spin_lock_init(&n->links[i].lock);
346 n->state = SELF_DOWN_PEER_LEAVING;
347 n->signature = INVALID_NODE_SIG;
348 n->active_links[0] = INVALID_BEARER_ID;
349 n->active_links[1] = INVALID_BEARER_ID;
350 if (!tipc_link_bc_create(net, tipc_own_addr(net), n->addr,
351 U16_MAX,
352 tipc_link_window(tipc_bc_sndlink(net)),
353 n->capabilities,
354 &n->bc_entry.inputq1,
355 &n->bc_entry.namedq,
356 tipc_bc_sndlink(net),
357 &n->bc_entry.link)) {
358 pr_warn("Broadcast rcv link creation failed, no memory\n");
359 kfree(n);
360 n = NULL;
361 goto exit;
362 }
363 tipc_node_get(n);
364 setup_timer(&n->timer, tipc_node_timeout, (unsigned long)n);
365 n->keepalive_intv = U32_MAX;
366 hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
367 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
368 if (n->addr < temp_node->addr)
369 break;
370 }
371 list_add_tail_rcu(&n->list, &temp_node->list);
372exit:
373 spin_unlock_bh(&tn->node_list_lock);
374 return n;
375}
376
377static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
378{
379 unsigned long tol = tipc_link_tolerance(l);
380 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
381
382 /* Link with lowest tolerance determines timer interval */
383 if (intv < n->keepalive_intv)
384 n->keepalive_intv = intv;
385
386 /* Ensure link's abort limit corresponds to current tolerance */
387 tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
388}
389
390static void tipc_node_delete(struct tipc_node *node)
391{
392 list_del_rcu(&node->list);
393 hlist_del_rcu(&node->hash);
394 tipc_node_put(node);
395
396 del_timer_sync(&node->timer);
397 tipc_node_put(node);
398}
399
400void tipc_node_stop(struct net *net)
401{
402 struct tipc_net *tn = tipc_net(net);
403 struct tipc_node *node, *t_node;
404
405 spin_lock_bh(&tn->node_list_lock);
406 list_for_each_entry_safe(node, t_node, &tn->node_list, list)
407 tipc_node_delete(node);
408 spin_unlock_bh(&tn->node_list_lock);
409}
410
411void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
412{
413 struct tipc_node *n;
414
415 if (in_own_node(net, addr))
416 return;
417
418 n = tipc_node_find(net, addr);
419 if (!n) {
420 pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
421 return;
422 }
423 tipc_node_write_lock(n);
424 list_add_tail(subscr, &n->publ_list);
425 tipc_node_write_unlock_fast(n);
426 tipc_node_put(n);
427}
428
429void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
430{
431 struct tipc_node *n;
432
433 if (in_own_node(net, addr))
434 return;
435
436 n = tipc_node_find(net, addr);
437 if (!n) {
438 pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
439 return;
440 }
441 tipc_node_write_lock(n);
442 list_del_init(subscr);
443 tipc_node_write_unlock_fast(n);
444 tipc_node_put(n);
445}
446
447int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
448{
449 struct tipc_node *node;
450 struct tipc_sock_conn *conn;
451 int err = 0;
452
453 if (in_own_node(net, dnode))
454 return 0;
455
456 node = tipc_node_find(net, dnode);
457 if (!node) {
458 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
459 return -EHOSTUNREACH;
460 }
461 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
462 if (!conn) {
463 err = -EHOSTUNREACH;
464 goto exit;
465 }
466 conn->peer_node = dnode;
467 conn->port = port;
468 conn->peer_port = peer_port;
469
470 tipc_node_write_lock(node);
471 list_add_tail(&conn->list, &node->conn_sks);
472 tipc_node_write_unlock(node);
473exit:
474 tipc_node_put(node);
475 return err;
476}
477
478void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
479{
480 struct tipc_node *node;
481 struct tipc_sock_conn *conn, *safe;
482
483 if (in_own_node(net, dnode))
484 return;
485
486 node = tipc_node_find(net, dnode);
487 if (!node)
488 return;
489
490 tipc_node_write_lock(node);
491 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
492 if (port != conn->port)
493 continue;
494 list_del(&conn->list);
495 kfree(conn);
496 }
497 tipc_node_write_unlock(node);
498 tipc_node_put(node);
499}
500
501/* tipc_node_timeout - handle expiration of node timer
502 */
503static void tipc_node_timeout(unsigned long data)
504{
505 struct tipc_node *n = (struct tipc_node *)data;
506 struct tipc_link_entry *le;
507 struct sk_buff_head xmitq;
508 int bearer_id;
509 int rc = 0;
510
511 __skb_queue_head_init(&xmitq);
512
513 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
514 tipc_node_read_lock(n);
515 le = &n->links[bearer_id];
516 spin_lock_bh(&le->lock);
517 if (le->link) {
518 /* Link tolerance may change asynchronously: */
519 tipc_node_calculate_timer(n, le->link);
520 rc = tipc_link_timeout(le->link, &xmitq);
521 }
522 spin_unlock_bh(&le->lock);
523 tipc_node_read_unlock(n);
524 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
525 if (rc & TIPC_LINK_DOWN_EVT)
526 tipc_node_link_down(n, bearer_id, false);
527 }
528 mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
529}
530
531/**
532 * __tipc_node_link_up - handle addition of link
533 * Node lock must be held by caller
534 * Link becomes active (alone or shared) or standby, depending on its priority.
535 */
536static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
537 struct sk_buff_head *xmitq)
538{
539 int *slot0 = &n->active_links[0];
540 int *slot1 = &n->active_links[1];
541 struct tipc_link *ol = node_active_link(n, 0);
542 struct tipc_link *nl = n->links[bearer_id].link;
543
544 if (!nl || tipc_link_is_up(nl))
545 return;
546
547 tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
548 if (!tipc_link_is_up(nl))
549 return;
550
551 n->working_links++;
552 n->action_flags |= TIPC_NOTIFY_LINK_UP;
553 n->link_id = tipc_link_id(nl);
554
555 /* Leave room for tunnel header when returning 'mtu' to users: */
556 n->links[bearer_id].mtu = tipc_link_mtu(nl) - INT_H_SIZE;
557
558 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
559 tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
560
561 pr_debug("Established link <%s> on network plane %c\n",
562 tipc_link_name(nl), tipc_link_plane(nl));
563
564 /* Ensure that a STATE message goes first */
565 tipc_link_build_state_msg(nl, xmitq);
566
567 /* First link? => give it both slots */
568 if (!ol) {
569 *slot0 = bearer_id;
570 *slot1 = bearer_id;
571 tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
572 n->action_flags |= TIPC_NOTIFY_NODE_UP;
573 tipc_link_set_active(nl, true);
574 tipc_bcast_add_peer(n->net, nl, xmitq);
575 return;
576 }
577
578 /* Second link => redistribute slots */
579 if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
580 pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
581 *slot0 = bearer_id;
582 *slot1 = bearer_id;
583 tipc_link_set_active(nl, true);
584 tipc_link_set_active(ol, false);
585 } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
586 tipc_link_set_active(nl, true);
587 *slot1 = bearer_id;
588 } else {
589 pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
590 }
591
592 /* Prepare synchronization with first link */
593 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
594}
595
596/**
597 * tipc_node_link_up - handle addition of link
598 *
599 * Link becomes active (alone or shared) or standby, depending on its priority.
600 */
601static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
602 struct sk_buff_head *xmitq)
603{
604 struct tipc_media_addr *maddr;
605
606 tipc_node_write_lock(n);
607 __tipc_node_link_up(n, bearer_id, xmitq);
608 maddr = &n->links[bearer_id].maddr;
609 tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr);
610 tipc_node_write_unlock(n);
611}
612
613/**
614 * __tipc_node_link_down - handle loss of link
615 */
616static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
617 struct sk_buff_head *xmitq,
618 struct tipc_media_addr **maddr)
619{
620 struct tipc_link_entry *le = &n->links[*bearer_id];
621 int *slot0 = &n->active_links[0];
622 int *slot1 = &n->active_links[1];
623 int i, highest = 0, prio;
624 struct tipc_link *l, *_l, *tnl;
625
626 l = n->links[*bearer_id].link;
627 if (!l || tipc_link_is_reset(l))
628 return;
629
630 n->working_links--;
631 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
632 n->link_id = tipc_link_id(l);
633
634 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
635
636 pr_debug("Lost link <%s> on network plane %c\n",
637 tipc_link_name(l), tipc_link_plane(l));
638
639 /* Select new active link if any available */
640 *slot0 = INVALID_BEARER_ID;
641 *slot1 = INVALID_BEARER_ID;
642 for (i = 0; i < MAX_BEARERS; i++) {
643 _l = n->links[i].link;
644 if (!_l || !tipc_link_is_up(_l))
645 continue;
646 if (_l == l)
647 continue;
648 prio = tipc_link_prio(_l);
649 if (prio < highest)
650 continue;
651 if (prio > highest) {
652 highest = prio;
653 *slot0 = i;
654 *slot1 = i;
655 continue;
656 }
657 *slot1 = i;
658 }
659
660 if (!tipc_node_is_up(n)) {
661 if (tipc_link_peer_is_down(l))
662 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
663 tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
664 tipc_link_fsm_evt(l, LINK_RESET_EVT);
665 tipc_link_reset(l);
666 tipc_link_build_reset_msg(l, xmitq);
667 *maddr = &n->links[*bearer_id].maddr;
668 node_lost_contact(n, &le->inputq);
669 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
670 return;
671 }
672 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
673
674 /* There is still a working link => initiate failover */
675 *bearer_id = n->active_links[0];
676 tnl = n->links[*bearer_id].link;
677 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
678 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
679 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
680 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
681 tipc_link_reset(l);
682 tipc_link_fsm_evt(l, LINK_RESET_EVT);
683 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
684 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
685 *maddr = &n->links[*bearer_id].maddr;
686}
687
688static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
689{
690 struct tipc_link_entry *le = &n->links[bearer_id];
691 struct tipc_link *l = le->link;
692 struct tipc_media_addr *maddr;
693 struct sk_buff_head xmitq;
694 int old_bearer_id = bearer_id;
695
696 if (!l)
697 return;
698
699 __skb_queue_head_init(&xmitq);
700
701 tipc_node_write_lock(n);
702 if (!tipc_link_is_establishing(l)) {
703 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
704 if (delete) {
705 kfree(l);
706 le->link = NULL;
707 n->link_cnt--;
708 }
709 } else {
710 /* Defuse pending tipc_node_link_up() */
711 tipc_link_fsm_evt(l, LINK_RESET_EVT);
712 }
713 tipc_node_write_unlock(n);
714 if (delete)
715 tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
716 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
717 tipc_sk_rcv(n->net, &le->inputq);
718}
719
720static bool tipc_node_is_up(struct tipc_node *n)
721{
722 return n->active_links[0] != INVALID_BEARER_ID;
723}
724
725void tipc_node_check_dest(struct net *net, u32 onode,
726 struct tipc_bearer *b,
727 u16 capabilities, u32 signature,
728 struct tipc_media_addr *maddr,
729 bool *respond, bool *dupl_addr)
730{
731 struct tipc_node *n;
732 struct tipc_link *l;
733 struct tipc_link_entry *le;
734 bool addr_match = false;
735 bool sign_match = false;
736 bool link_up = false;
737 bool accept_addr = false;
738 bool reset = true;
739 char *if_name;
740 unsigned long intv;
741
742 *dupl_addr = false;
743 *respond = false;
744
745 n = tipc_node_create(net, onode, capabilities);
746 if (!n)
747 return;
748
749 tipc_node_write_lock(n);
750
751 le = &n->links[b->identity];
752
753 /* Prepare to validate requesting node's signature and media address */
754 l = le->link;
755 link_up = l && tipc_link_is_up(l);
756 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
757 sign_match = (signature == n->signature);
758
759 /* These three flags give us eight permutations: */
760
761 if (sign_match && addr_match && link_up) {
762 /* All is fine. Do nothing. */
763 reset = false;
764 } else if (sign_match && addr_match && !link_up) {
765 /* Respond. The link will come up in due time */
766 *respond = true;
767 } else if (sign_match && !addr_match && link_up) {
768 /* Peer has changed i/f address without rebooting.
769 * If so, the link will reset soon, and the next
770 * discovery will be accepted. So we can ignore it.
771 * It may also be an cloned or malicious peer having
772 * chosen the same node address and signature as an
773 * existing one.
774 * Ignore requests until the link goes down, if ever.
775 */
776 *dupl_addr = true;
777 } else if (sign_match && !addr_match && !link_up) {
778 /* Peer link has changed i/f address without rebooting.
779 * It may also be a cloned or malicious peer; we can't
780 * distinguish between the two.
781 * The signature is correct, so we must accept.
782 */
783 accept_addr = true;
784 *respond = true;
785 } else if (!sign_match && addr_match && link_up) {
786 /* Peer node rebooted. Two possibilities:
787 * - Delayed re-discovery; this link endpoint has already
788 * reset and re-established contact with the peer, before
789 * receiving a discovery message from that node.
790 * (The peer happened to receive one from this node first).
791 * - The peer came back so fast that our side has not
792 * discovered it yet. Probing from this side will soon
793 * reset the link, since there can be no working link
794 * endpoint at the peer end, and the link will re-establish.
795 * Accept the signature, since it comes from a known peer.
796 */
797 n->signature = signature;
798 } else if (!sign_match && addr_match && !link_up) {
799 /* The peer node has rebooted.
800 * Accept signature, since it is a known peer.
801 */
802 n->signature = signature;
803 *respond = true;
804 } else if (!sign_match && !addr_match && link_up) {
805 /* Peer rebooted with new address, or a new/duplicate peer.
806 * Ignore until the link goes down, if ever.
807 */
808 *dupl_addr = true;
809 } else if (!sign_match && !addr_match && !link_up) {
810 /* Peer rebooted with new address, or it is a new peer.
811 * Accept signature and address.
812 */
813 n->signature = signature;
814 accept_addr = true;
815 *respond = true;
816 }
817
818 if (!accept_addr)
819 goto exit;
820
821 /* Now create new link if not already existing */
822 if (!l) {
823 if (n->link_cnt == 2) {
824 pr_warn("Cannot establish 3rd link to %x\n", n->addr);
825 goto exit;
826 }
827 if_name = strchr(b->name, ':') + 1;
828 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
829 b->net_plane, b->mtu, b->priority,
830 b->window, mod(tipc_net(net)->random),
831 tipc_own_addr(net), onode,
832 n->capabilities,
833 tipc_bc_sndlink(n->net), n->bc_entry.link,
834 &le->inputq,
835 &n->bc_entry.namedq, &l)) {
836 *respond = false;
837 goto exit;
838 }
839 tipc_link_reset(l);
840 tipc_link_fsm_evt(l, LINK_RESET_EVT);
841 if (n->state == NODE_FAILINGOVER)
842 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
843 le->link = l;
844 n->link_cnt++;
845 tipc_node_calculate_timer(n, l);
846 if (n->link_cnt == 1) {
847 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
848 if (!mod_timer(&n->timer, intv))
849 tipc_node_get(n);
850 }
851 }
852 memcpy(&le->maddr, maddr, sizeof(*maddr));
853exit:
854 tipc_node_write_unlock(n);
855 if (reset && l && !tipc_link_is_reset(l))
856 tipc_node_link_down(n, b->identity, false);
857 tipc_node_put(n);
858}
859
860void tipc_node_delete_links(struct net *net, int bearer_id)
861{
862 struct tipc_net *tn = net_generic(net, tipc_net_id);
863 struct tipc_node *n;
864
865 rcu_read_lock();
866 list_for_each_entry_rcu(n, &tn->node_list, list) {
867 tipc_node_link_down(n, bearer_id, true);
868 }
869 rcu_read_unlock();
870}
871
872static void tipc_node_reset_links(struct tipc_node *n)
873{
874 char addr_string[16];
875 int i;
876
877 pr_warn("Resetting all links to %s\n",
878 tipc_addr_string_fill(addr_string, n->addr));
879
880 for (i = 0; i < MAX_BEARERS; i++) {
881 tipc_node_link_down(n, i, false);
882 }
883}
884
885/* tipc_node_fsm_evt - node finite state machine
886 * Determines when contact is allowed with peer node
887 */
888static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
889{
890 int state = n->state;
891
892 switch (state) {
893 case SELF_DOWN_PEER_DOWN:
894 switch (evt) {
895 case SELF_ESTABL_CONTACT_EVT:
896 state = SELF_UP_PEER_COMING;
897 break;
898 case PEER_ESTABL_CONTACT_EVT:
899 state = SELF_COMING_PEER_UP;
900 break;
901 case SELF_LOST_CONTACT_EVT:
902 case PEER_LOST_CONTACT_EVT:
903 break;
904 case NODE_SYNCH_END_EVT:
905 case NODE_SYNCH_BEGIN_EVT:
906 case NODE_FAILOVER_BEGIN_EVT:
907 case NODE_FAILOVER_END_EVT:
908 default:
909 goto illegal_evt;
910 }
911 break;
912 case SELF_UP_PEER_UP:
913 switch (evt) {
914 case SELF_LOST_CONTACT_EVT:
915 state = SELF_DOWN_PEER_LEAVING;
916 break;
917 case PEER_LOST_CONTACT_EVT:
918 state = SELF_LEAVING_PEER_DOWN;
919 break;
920 case NODE_SYNCH_BEGIN_EVT:
921 state = NODE_SYNCHING;
922 break;
923 case NODE_FAILOVER_BEGIN_EVT:
924 state = NODE_FAILINGOVER;
925 break;
926 case SELF_ESTABL_CONTACT_EVT:
927 case PEER_ESTABL_CONTACT_EVT:
928 case NODE_SYNCH_END_EVT:
929 case NODE_FAILOVER_END_EVT:
930 break;
931 default:
932 goto illegal_evt;
933 }
934 break;
935 case SELF_DOWN_PEER_LEAVING:
936 switch (evt) {
937 case PEER_LOST_CONTACT_EVT:
938 state = SELF_DOWN_PEER_DOWN;
939 break;
940 case SELF_ESTABL_CONTACT_EVT:
941 case PEER_ESTABL_CONTACT_EVT:
942 case SELF_LOST_CONTACT_EVT:
943 break;
944 case NODE_SYNCH_END_EVT:
945 case NODE_SYNCH_BEGIN_EVT:
946 case NODE_FAILOVER_BEGIN_EVT:
947 case NODE_FAILOVER_END_EVT:
948 default:
949 goto illegal_evt;
950 }
951 break;
952 case SELF_UP_PEER_COMING:
953 switch (evt) {
954 case PEER_ESTABL_CONTACT_EVT:
955 state = SELF_UP_PEER_UP;
956 break;
957 case SELF_LOST_CONTACT_EVT:
958 state = SELF_DOWN_PEER_DOWN;
959 break;
960 case SELF_ESTABL_CONTACT_EVT:
961 case PEER_LOST_CONTACT_EVT:
962 case NODE_SYNCH_END_EVT:
963 case NODE_FAILOVER_BEGIN_EVT:
964 break;
965 case NODE_SYNCH_BEGIN_EVT:
966 case NODE_FAILOVER_END_EVT:
967 default:
968 goto illegal_evt;
969 }
970 break;
971 case SELF_COMING_PEER_UP:
972 switch (evt) {
973 case SELF_ESTABL_CONTACT_EVT:
974 state = SELF_UP_PEER_UP;
975 break;
976 case PEER_LOST_CONTACT_EVT:
977 state = SELF_DOWN_PEER_DOWN;
978 break;
979 case SELF_LOST_CONTACT_EVT:
980 case PEER_ESTABL_CONTACT_EVT:
981 break;
982 case NODE_SYNCH_END_EVT:
983 case NODE_SYNCH_BEGIN_EVT:
984 case NODE_FAILOVER_BEGIN_EVT:
985 case NODE_FAILOVER_END_EVT:
986 default:
987 goto illegal_evt;
988 }
989 break;
990 case SELF_LEAVING_PEER_DOWN:
991 switch (evt) {
992 case SELF_LOST_CONTACT_EVT:
993 state = SELF_DOWN_PEER_DOWN;
994 break;
995 case SELF_ESTABL_CONTACT_EVT:
996 case PEER_ESTABL_CONTACT_EVT:
997 case PEER_LOST_CONTACT_EVT:
998 break;
999 case NODE_SYNCH_END_EVT:
1000 case NODE_SYNCH_BEGIN_EVT:
1001 case NODE_FAILOVER_BEGIN_EVT:
1002 case NODE_FAILOVER_END_EVT:
1003 default:
1004 goto illegal_evt;
1005 }
1006 break;
1007 case NODE_FAILINGOVER:
1008 switch (evt) {
1009 case SELF_LOST_CONTACT_EVT:
1010 state = SELF_DOWN_PEER_LEAVING;
1011 break;
1012 case PEER_LOST_CONTACT_EVT:
1013 state = SELF_LEAVING_PEER_DOWN;
1014 break;
1015 case NODE_FAILOVER_END_EVT:
1016 state = SELF_UP_PEER_UP;
1017 break;
1018 case NODE_FAILOVER_BEGIN_EVT:
1019 case SELF_ESTABL_CONTACT_EVT:
1020 case PEER_ESTABL_CONTACT_EVT:
1021 break;
1022 case NODE_SYNCH_BEGIN_EVT:
1023 case NODE_SYNCH_END_EVT:
1024 default:
1025 goto illegal_evt;
1026 }
1027 break;
1028 case NODE_SYNCHING:
1029 switch (evt) {
1030 case SELF_LOST_CONTACT_EVT:
1031 state = SELF_DOWN_PEER_LEAVING;
1032 break;
1033 case PEER_LOST_CONTACT_EVT:
1034 state = SELF_LEAVING_PEER_DOWN;
1035 break;
1036 case NODE_SYNCH_END_EVT:
1037 state = SELF_UP_PEER_UP;
1038 break;
1039 case NODE_FAILOVER_BEGIN_EVT:
1040 state = NODE_FAILINGOVER;
1041 break;
1042 case NODE_SYNCH_BEGIN_EVT:
1043 case SELF_ESTABL_CONTACT_EVT:
1044 case PEER_ESTABL_CONTACT_EVT:
1045 break;
1046 case NODE_FAILOVER_END_EVT:
1047 default:
1048 goto illegal_evt;
1049 }
1050 break;
1051 default:
1052 pr_err("Unknown node fsm state %x\n", state);
1053 break;
1054 }
1055 n->state = state;
1056 return;
1057
1058illegal_evt:
1059 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1060}
1061
1062static void node_lost_contact(struct tipc_node *n,
1063 struct sk_buff_head *inputq)
1064{
1065 char addr_string[16];
1066 struct tipc_sock_conn *conn, *safe;
1067 struct tipc_link *l;
1068 struct list_head *conns = &n->conn_sks;
1069 struct sk_buff *skb;
1070 uint i;
1071
1072 pr_debug("Lost contact with %s\n",
1073 tipc_addr_string_fill(addr_string, n->addr));
1074
1075 /* Clean up broadcast state */
1076 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1077
1078 /* Abort any ongoing link failover */
1079 for (i = 0; i < MAX_BEARERS; i++) {
1080 l = n->links[i].link;
1081 if (l)
1082 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1083 }
1084
1085 /* Notify publications from this node */
1086 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1087
1088 /* Notify sockets connected to node */
1089 list_for_each_entry_safe(conn, safe, conns, list) {
1090 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1091 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1092 conn->peer_node, conn->port,
1093 conn->peer_port, TIPC_ERR_NO_NODE);
1094 if (likely(skb))
1095 skb_queue_tail(inputq, skb);
1096 list_del(&conn->list);
1097 kfree(conn);
1098 }
1099}
1100
1101/**
1102 * tipc_node_get_linkname - get the name of a link
1103 *
1104 * @bearer_id: id of the bearer
1105 * @node: peer node address
1106 * @linkname: link name output buffer
1107 *
1108 * Returns 0 on success
1109 */
1110int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1111 char *linkname, size_t len)
1112{
1113 struct tipc_link *link;
1114 int err = -EINVAL;
1115 struct tipc_node *node = tipc_node_find(net, addr);
1116
1117 if (!node)
1118 return err;
1119
1120 if (bearer_id >= MAX_BEARERS)
1121 goto exit;
1122
1123 tipc_node_read_lock(node);
1124 link = node->links[bearer_id].link;
1125 if (link) {
1126 strncpy(linkname, tipc_link_name(link), len);
1127 err = 0;
1128 }
1129exit:
1130 tipc_node_read_unlock(node);
1131 tipc_node_put(node);
1132 return err;
1133}
1134
1135/* Caller should hold node lock for the passed node */
1136static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1137{
1138 void *hdr;
1139 struct nlattr *attrs;
1140
1141 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1142 NLM_F_MULTI, TIPC_NL_NODE_GET);
1143 if (!hdr)
1144 return -EMSGSIZE;
1145
1146 attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE);
1147 if (!attrs)
1148 goto msg_full;
1149
1150 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1151 goto attr_msg_full;
1152 if (tipc_node_is_up(node))
1153 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1154 goto attr_msg_full;
1155
1156 nla_nest_end(msg->skb, attrs);
1157 genlmsg_end(msg->skb, hdr);
1158
1159 return 0;
1160
1161attr_msg_full:
1162 nla_nest_cancel(msg->skb, attrs);
1163msg_full:
1164 genlmsg_cancel(msg->skb, hdr);
1165
1166 return -EMSGSIZE;
1167}
1168
1169/**
1170 * tipc_node_xmit() is the general link level function for message sending
1171 * @net: the applicable net namespace
1172 * @list: chain of buffers containing message
1173 * @dnode: address of destination node
1174 * @selector: a number used for deterministic link selection
1175 * Consumes the buffer chain, except when returning -ELINKCONG
1176 * Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1177 */
1178int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1179 u32 dnode, int selector)
1180{
1181 struct tipc_link_entry *le = NULL;
1182 struct tipc_node *n;
1183 struct sk_buff_head xmitq;
1184 int bearer_id;
1185 int rc;
1186
1187 if (in_own_node(net, dnode)) {
1188 tipc_sk_rcv(net, list);
1189 return 0;
1190 }
1191
1192 n = tipc_node_find(net, dnode);
1193 if (unlikely(!n)) {
1194 skb_queue_purge(list);
1195 return -EHOSTUNREACH;
1196 }
1197
1198 tipc_node_read_lock(n);
1199 bearer_id = n->active_links[selector & 1];
1200 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1201 tipc_node_read_unlock(n);
1202 tipc_node_put(n);
1203 skb_queue_purge(list);
1204 return -EHOSTUNREACH;
1205 }
1206
1207 __skb_queue_head_init(&xmitq);
1208 le = &n->links[bearer_id];
1209 spin_lock_bh(&le->lock);
1210 rc = tipc_link_xmit(le->link, list, &xmitq);
1211 spin_unlock_bh(&le->lock);
1212 tipc_node_read_unlock(n);
1213
1214 if (likely(rc == 0))
1215 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1216 else if (rc == -ENOBUFS)
1217 tipc_node_link_down(n, bearer_id, false);
1218
1219 tipc_node_put(n);
1220
1221 return rc;
1222}
1223
1224/* tipc_node_xmit_skb(): send single buffer to destination
1225 * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
1226 * messages, which will not be rejected
1227 * The only exception is datagram messages rerouted after secondary
1228 * lookup, which are rare and safe to dispose of anyway.
1229 * TODO: Return real return value, and let callers use
1230 * tipc_wait_for_sendpkt() where applicable
1231 */
1232int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1233 u32 selector)
1234{
1235 struct sk_buff_head head;
1236 int rc;
1237
1238 skb_queue_head_init(&head);
1239 __skb_queue_tail(&head, skb);
1240 rc = tipc_node_xmit(net, &head, dnode, selector);
1241 if (rc == -ELINKCONG)
1242 kfree_skb(skb);
1243 return 0;
1244}
1245
1246void tipc_node_broadcast(struct net *net, struct sk_buff *skb)
1247{
1248 struct sk_buff *txskb;
1249 struct tipc_node *n;
1250 u32 dst;
1251
1252 rcu_read_lock();
1253 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1254 dst = n->addr;
1255 if (in_own_node(net, dst))
1256 continue;
1257 if (!tipc_node_is_up(n))
1258 continue;
1259 txskb = pskb_copy(skb, GFP_ATOMIC);
1260 if (!txskb)
1261 break;
1262 msg_set_destnode(buf_msg(txskb), dst);
1263 tipc_node_xmit_skb(net, txskb, dst, 0);
1264 }
1265 rcu_read_unlock();
1266
1267 kfree_skb(skb);
1268}
1269
1270static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1271 int bearer_id, struct sk_buff_head *xmitq)
1272{
1273 struct tipc_link *ucl;
1274 int rc;
1275
1276 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr);
1277
1278 if (rc & TIPC_LINK_DOWN_EVT) {
1279 tipc_bearer_reset_all(n->net);
1280 return;
1281 }
1282
1283 if (!(rc & TIPC_LINK_SND_STATE))
1284 return;
1285
1286 /* If probe message, a STATE response will be sent anyway */
1287 if (msg_probe(hdr))
1288 return;
1289
1290 /* Produce a STATE message carrying broadcast NACK */
1291 tipc_node_read_lock(n);
1292 ucl = n->links[bearer_id].link;
1293 if (ucl)
1294 tipc_link_build_state_msg(ucl, xmitq);
1295 tipc_node_read_unlock(n);
1296}
1297
1298/**
1299 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1300 * @net: the applicable net namespace
1301 * @skb: TIPC packet
1302 * @bearer_id: id of bearer message arrived on
1303 *
1304 * Invoked with no locks held.
1305 */
1306static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1307{
1308 int rc;
1309 struct sk_buff_head xmitq;
1310 struct tipc_bclink_entry *be;
1311 struct tipc_link_entry *le;
1312 struct tipc_msg *hdr = buf_msg(skb);
1313 int usr = msg_user(hdr);
1314 u32 dnode = msg_destnode(hdr);
1315 struct tipc_node *n;
1316
1317 __skb_queue_head_init(&xmitq);
1318
1319 /* If NACK for other node, let rcv link for that node peek into it */
1320 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1321 n = tipc_node_find(net, dnode);
1322 else
1323 n = tipc_node_find(net, msg_prevnode(hdr));
1324 if (!n) {
1325 kfree_skb(skb);
1326 return;
1327 }
1328 be = &n->bc_entry;
1329 le = &n->links[bearer_id];
1330
1331 rc = tipc_bcast_rcv(net, be->link, skb);
1332
1333 /* Broadcast ACKs are sent on a unicast link */
1334 if (rc & TIPC_LINK_SND_STATE) {
1335 tipc_node_read_lock(n);
1336 tipc_link_build_state_msg(le->link, &xmitq);
1337 tipc_node_read_unlock(n);
1338 }
1339
1340 if (!skb_queue_empty(&xmitq))
1341 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1342
1343 /* Deliver. 'arrvq' is under inputq2's lock protection */
1344 if (!skb_queue_empty(&be->inputq1)) {
1345 spin_lock_bh(&be->inputq2.lock);
1346 spin_lock_bh(&be->inputq1.lock);
1347 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1348 spin_unlock_bh(&be->inputq1.lock);
1349 spin_unlock_bh(&be->inputq2.lock);
1350 tipc_sk_mcast_rcv(net, &be->arrvq, &be->inputq2);
1351 }
1352
1353 if (rc & TIPC_LINK_DOWN_EVT) {
1354 /* Reception reassembly failure => reset all links to peer */
1355 if (!tipc_link_is_up(be->link))
1356 tipc_node_reset_links(n);
1357
1358 /* Retransmission failure => reset all links to all peers */
1359 if (!tipc_link_is_up(tipc_bc_sndlink(net)))
1360 tipc_bearer_reset_all(net);
1361 }
1362
1363 tipc_node_put(n);
1364}
1365
1366/**
1367 * tipc_node_check_state - check and if necessary update node state
1368 * @skb: TIPC packet
1369 * @bearer_id: identity of bearer delivering the packet
1370 * Returns true if state is ok, otherwise consumes buffer and returns false
1371 */
1372static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1373 int bearer_id, struct sk_buff_head *xmitq)
1374{
1375 struct tipc_msg *hdr = buf_msg(skb);
1376 int usr = msg_user(hdr);
1377 int mtyp = msg_type(hdr);
1378 u16 oseqno = msg_seqno(hdr);
1379 u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
1380 u16 exp_pkts = msg_msgcnt(hdr);
1381 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1382 int state = n->state;
1383 struct tipc_link *l, *tnl, *pl = NULL;
1384 struct tipc_media_addr *maddr;
1385 int pb_id;
1386
1387 l = n->links[bearer_id].link;
1388 if (!l)
1389 return false;
1390 rcv_nxt = tipc_link_rcv_nxt(l);
1391
1392
1393 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1394 return true;
1395
1396 /* Find parallel link, if any */
1397 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1398 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1399 pl = n->links[pb_id].link;
1400 break;
1401 }
1402 }
1403
1404 /* Check and update node accesibility if applicable */
1405 if (state == SELF_UP_PEER_COMING) {
1406 if (!tipc_link_is_up(l))
1407 return true;
1408 if (!msg_peer_link_is_up(hdr))
1409 return true;
1410 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1411 }
1412
1413 if (state == SELF_DOWN_PEER_LEAVING) {
1414 if (msg_peer_node_is_up(hdr))
1415 return false;
1416 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1417 return true;
1418 }
1419
1420 if (state == SELF_LEAVING_PEER_DOWN)
1421 return false;
1422
1423 /* Ignore duplicate packets */
1424 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1425 return true;
1426
1427 /* Initiate or update failover mode if applicable */
1428 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1429 syncpt = oseqno + exp_pkts - 1;
1430 if (pl && tipc_link_is_up(pl)) {
1431 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1432 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
1433 tipc_link_inputq(l));
1434 }
1435 /* If pkts arrive out of order, use lowest calculated syncpt */
1436 if (less(syncpt, n->sync_point))
1437 n->sync_point = syncpt;
1438 }
1439
1440 /* Open parallel link when tunnel link reaches synch point */
1441 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
1442 if (!more(rcv_nxt, n->sync_point))
1443 return true;
1444 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
1445 if (pl)
1446 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
1447 return true;
1448 }
1449
1450 /* No synching needed if only one link */
1451 if (!pl || !tipc_link_is_up(pl))
1452 return true;
1453
1454 /* Initiate synch mode if applicable */
1455 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
1456 syncpt = iseqno + exp_pkts - 1;
1457 if (!tipc_link_is_up(l)) {
1458 tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
1459 __tipc_node_link_up(n, bearer_id, xmitq);
1460 }
1461 if (n->state == SELF_UP_PEER_UP) {
1462 n->sync_point = syncpt;
1463 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
1464 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
1465 }
1466 }
1467
1468 /* Open tunnel link when parallel link reaches synch point */
1469 if (n->state == NODE_SYNCHING) {
1470 if (tipc_link_is_synching(l)) {
1471 tnl = l;
1472 } else {
1473 tnl = pl;
1474 pl = l;
1475 }
1476 inputq_len = skb_queue_len(tipc_link_inputq(pl));
1477 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
1478 if (more(dlv_nxt, n->sync_point)) {
1479 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1480 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1481 return true;
1482 }
1483 if (l == pl)
1484 return true;
1485 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
1486 return true;
1487 if (usr == LINK_PROTOCOL)
1488 return true;
1489 return false;
1490 }
1491 return true;
1492}
1493
1494/**
1495 * tipc_rcv - process TIPC packets/messages arriving from off-node
1496 * @net: the applicable net namespace
1497 * @skb: TIPC packet
1498 * @bearer: pointer to bearer message arrived on
1499 *
1500 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1501 * structure (i.e. cannot be NULL), but bearer can be inactive.
1502 */
1503void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
1504{
1505 struct sk_buff_head xmitq;
1506 struct tipc_node *n;
1507 struct tipc_msg *hdr = buf_msg(skb);
1508 int usr = msg_user(hdr);
1509 int bearer_id = b->identity;
1510 struct tipc_link_entry *le;
1511 u16 bc_ack = msg_bcast_ack(hdr);
1512 u32 self = tipc_own_addr(net);
1513 int rc = 0;
1514
1515 __skb_queue_head_init(&xmitq);
1516
1517 /* Ensure message is well-formed */
1518 if (unlikely(!tipc_msg_validate(skb)))
1519 goto discard;
1520
1521 /* Handle arrival of discovery or broadcast packet */
1522 if (unlikely(msg_non_seq(hdr))) {
1523 if (unlikely(usr == LINK_CONFIG))
1524 return tipc_disc_rcv(net, skb, b);
1525 else
1526 return tipc_node_bc_rcv(net, skb, bearer_id);
1527 }
1528
1529 /* Discard unicast link messages destined for another node */
1530 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
1531 goto discard;
1532
1533 /* Locate neighboring node that sent packet */
1534 n = tipc_node_find(net, msg_prevnode(hdr));
1535 if (unlikely(!n))
1536 goto discard;
1537 le = &n->links[bearer_id];
1538
1539 /* Ensure broadcast reception is in synch with peer's send state */
1540 if (unlikely(usr == LINK_PROTOCOL))
1541 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
1542 else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack))
1543 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
1544
1545 /* Receive packet directly if conditions permit */
1546 tipc_node_read_lock(n);
1547 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
1548 spin_lock_bh(&le->lock);
1549 if (le->link) {
1550 rc = tipc_link_rcv(le->link, skb, &xmitq);
1551 skb = NULL;
1552 }
1553 spin_unlock_bh(&le->lock);
1554 }
1555 tipc_node_read_unlock(n);
1556
1557 /* Check/update node state before receiving */
1558 if (unlikely(skb)) {
1559 tipc_node_write_lock(n);
1560 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
1561 if (le->link) {
1562 rc = tipc_link_rcv(le->link, skb, &xmitq);
1563 skb = NULL;
1564 }
1565 }
1566 tipc_node_write_unlock(n);
1567 }
1568
1569 if (unlikely(rc & TIPC_LINK_UP_EVT))
1570 tipc_node_link_up(n, bearer_id, &xmitq);
1571
1572 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
1573 tipc_node_link_down(n, bearer_id, false);
1574
1575 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
1576 tipc_named_rcv(net, &n->bc_entry.namedq);
1577
1578 if (!skb_queue_empty(&le->inputq))
1579 tipc_sk_rcv(net, &le->inputq);
1580
1581 if (!skb_queue_empty(&xmitq))
1582 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1583
1584 tipc_node_put(n);
1585discard:
1586 kfree_skb(skb);
1587}
1588
1589int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
1590{
1591 struct net *net = sock_net(skb->sk);
1592 struct tipc_net *tn = net_generic(net, tipc_net_id);
1593 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
1594 struct tipc_node *peer;
1595 u32 addr;
1596 int err;
1597 int i;
1598
1599 /* We identify the peer by its net */
1600 if (!info->attrs[TIPC_NLA_NET])
1601 return -EINVAL;
1602
1603 err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
1604 info->attrs[TIPC_NLA_NET],
1605 tipc_nl_net_policy);
1606 if (err)
1607 return err;
1608
1609 if (!attrs[TIPC_NLA_NET_ADDR])
1610 return -EINVAL;
1611
1612 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
1613
1614 if (in_own_node(net, addr))
1615 return -ENOTSUPP;
1616
1617 spin_lock_bh(&tn->node_list_lock);
1618 peer = tipc_node_find(net, addr);
1619 if (!peer) {
1620 spin_unlock_bh(&tn->node_list_lock);
1621 return -ENXIO;
1622 }
1623
1624 tipc_node_write_lock(peer);
1625 if (peer->state != SELF_DOWN_PEER_DOWN &&
1626 peer->state != SELF_DOWN_PEER_LEAVING) {
1627 tipc_node_write_unlock(peer);
1628 err = -EBUSY;
1629 goto err_out;
1630 }
1631
1632 for (i = 0; i < MAX_BEARERS; i++) {
1633 struct tipc_link_entry *le = &peer->links[i];
1634
1635 if (le->link) {
1636 kfree(le->link);
1637 le->link = NULL;
1638 peer->link_cnt--;
1639 }
1640 }
1641 tipc_node_write_unlock(peer);
1642 tipc_node_delete(peer);
1643
1644 err = 0;
1645err_out:
1646 tipc_node_put(peer);
1647 spin_unlock_bh(&tn->node_list_lock);
1648
1649 return err;
1650}
1651
1652int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
1653{
1654 int err;
1655 struct net *net = sock_net(skb->sk);
1656 struct tipc_net *tn = net_generic(net, tipc_net_id);
1657 int done = cb->args[0];
1658 int last_addr = cb->args[1];
1659 struct tipc_node *node;
1660 struct tipc_nl_msg msg;
1661
1662 if (done)
1663 return 0;
1664
1665 msg.skb = skb;
1666 msg.portid = NETLINK_CB(cb->skb).portid;
1667 msg.seq = cb->nlh->nlmsg_seq;
1668
1669 rcu_read_lock();
1670 if (last_addr) {
1671 node = tipc_node_find(net, last_addr);
1672 if (!node) {
1673 rcu_read_unlock();
1674 /* We never set seq or call nl_dump_check_consistent()
1675 * this means that setting prev_seq here will cause the
1676 * consistence check to fail in the netlink callback
1677 * handler. Resulting in the NLMSG_DONE message having
1678 * the NLM_F_DUMP_INTR flag set if the node state
1679 * changed while we released the lock.
1680 */
1681 cb->prev_seq = 1;
1682 return -EPIPE;
1683 }
1684 tipc_node_put(node);
1685 }
1686
1687 list_for_each_entry_rcu(node, &tn->node_list, list) {
1688 if (last_addr) {
1689 if (node->addr == last_addr)
1690 last_addr = 0;
1691 else
1692 continue;
1693 }
1694
1695 tipc_node_read_lock(node);
1696 err = __tipc_nl_add_node(&msg, node);
1697 if (err) {
1698 last_addr = node->addr;
1699 tipc_node_read_unlock(node);
1700 goto out;
1701 }
1702
1703 tipc_node_read_unlock(node);
1704 }
1705 done = 1;
1706out:
1707 cb->args[0] = done;
1708 cb->args[1] = last_addr;
1709 rcu_read_unlock();
1710
1711 return skb->len;
1712}
1713
1714/* tipc_node_find_by_name - locate owner node of link by link's name
1715 * @net: the applicable net namespace
1716 * @name: pointer to link name string
1717 * @bearer_id: pointer to index in 'node->links' array where the link was found.
1718 *
1719 * Returns pointer to node owning the link, or 0 if no matching link is found.
1720 */
1721static struct tipc_node *tipc_node_find_by_name(struct net *net,
1722 const char *link_name,
1723 unsigned int *bearer_id)
1724{
1725 struct tipc_net *tn = net_generic(net, tipc_net_id);
1726 struct tipc_link *l;
1727 struct tipc_node *n;
1728 struct tipc_node *found_node = NULL;
1729 int i;
1730
1731 *bearer_id = 0;
1732 rcu_read_lock();
1733 list_for_each_entry_rcu(n, &tn->node_list, list) {
1734 tipc_node_read_lock(n);
1735 for (i = 0; i < MAX_BEARERS; i++) {
1736 l = n->links[i].link;
1737 if (l && !strcmp(tipc_link_name(l), link_name)) {
1738 *bearer_id = i;
1739 found_node = n;
1740 break;
1741 }
1742 }
1743 tipc_node_read_unlock(n);
1744 if (found_node)
1745 break;
1746 }
1747 rcu_read_unlock();
1748
1749 return found_node;
1750}
1751
1752int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
1753{
1754 int err;
1755 int res = 0;
1756 int bearer_id;
1757 char *name;
1758 struct tipc_link *link;
1759 struct tipc_node *node;
1760 struct sk_buff_head xmitq;
1761 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1762 struct net *net = sock_net(skb->sk);
1763
1764 __skb_queue_head_init(&xmitq);
1765
1766 if (!info->attrs[TIPC_NLA_LINK])
1767 return -EINVAL;
1768
1769 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1770 info->attrs[TIPC_NLA_LINK],
1771 tipc_nl_link_policy);
1772 if (err)
1773 return err;
1774
1775 if (!attrs[TIPC_NLA_LINK_NAME])
1776 return -EINVAL;
1777
1778 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1779
1780 if (strcmp(name, tipc_bclink_name) == 0)
1781 return tipc_nl_bc_link_set(net, attrs);
1782
1783 node = tipc_node_find_by_name(net, name, &bearer_id);
1784 if (!node)
1785 return -EINVAL;
1786
1787 tipc_node_read_lock(node);
1788
1789 link = node->links[bearer_id].link;
1790 if (!link) {
1791 res = -EINVAL;
1792 goto out;
1793 }
1794
1795 if (attrs[TIPC_NLA_LINK_PROP]) {
1796 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1797
1798 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
1799 props);
1800 if (err) {
1801 res = err;
1802 goto out;
1803 }
1804
1805 if (props[TIPC_NLA_PROP_TOL]) {
1806 u32 tol;
1807
1808 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1809 tipc_link_set_tolerance(link, tol, &xmitq);
1810 }
1811 if (props[TIPC_NLA_PROP_PRIO]) {
1812 u32 prio;
1813
1814 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1815 tipc_link_set_prio(link, prio, &xmitq);
1816 }
1817 if (props[TIPC_NLA_PROP_WIN]) {
1818 u32 win;
1819
1820 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1821 tipc_link_set_queue_limits(link, win);
1822 }
1823 }
1824
1825out:
1826 tipc_node_read_unlock(node);
1827 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr);
1828 return res;
1829}
1830
1831int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
1832{
1833 struct net *net = genl_info_net(info);
1834 struct tipc_nl_msg msg;
1835 char *name;
1836 int err;
1837
1838 msg.portid = info->snd_portid;
1839 msg.seq = info->snd_seq;
1840
1841 if (!info->attrs[TIPC_NLA_LINK_NAME])
1842 return -EINVAL;
1843 name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
1844
1845 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1846 if (!msg.skb)
1847 return -ENOMEM;
1848
1849 if (strcmp(name, tipc_bclink_name) == 0) {
1850 err = tipc_nl_add_bc_link(net, &msg);
1851 if (err) {
1852 nlmsg_free(msg.skb);
1853 return err;
1854 }
1855 } else {
1856 int bearer_id;
1857 struct tipc_node *node;
1858 struct tipc_link *link;
1859
1860 node = tipc_node_find_by_name(net, name, &bearer_id);
1861 if (!node)
1862 return -EINVAL;
1863
1864 tipc_node_read_lock(node);
1865 link = node->links[bearer_id].link;
1866 if (!link) {
1867 tipc_node_read_unlock(node);
1868 nlmsg_free(msg.skb);
1869 return -EINVAL;
1870 }
1871
1872 err = __tipc_nl_add_link(net, &msg, link, 0);
1873 tipc_node_read_unlock(node);
1874 if (err) {
1875 nlmsg_free(msg.skb);
1876 return err;
1877 }
1878 }
1879
1880 return genlmsg_reply(msg.skb, info);
1881}
1882
1883int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
1884{
1885 int err;
1886 char *link_name;
1887 unsigned int bearer_id;
1888 struct tipc_link *link;
1889 struct tipc_node *node;
1890 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1891 struct net *net = sock_net(skb->sk);
1892 struct tipc_link_entry *le;
1893
1894 if (!info->attrs[TIPC_NLA_LINK])
1895 return -EINVAL;
1896
1897 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1898 info->attrs[TIPC_NLA_LINK],
1899 tipc_nl_link_policy);
1900 if (err)
1901 return err;
1902
1903 if (!attrs[TIPC_NLA_LINK_NAME])
1904 return -EINVAL;
1905
1906 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1907
1908 if (strcmp(link_name, tipc_bclink_name) == 0) {
1909 err = tipc_bclink_reset_stats(net);
1910 if (err)
1911 return err;
1912 return 0;
1913 }
1914
1915 node = tipc_node_find_by_name(net, link_name, &bearer_id);
1916 if (!node)
1917 return -EINVAL;
1918
1919 le = &node->links[bearer_id];
1920 tipc_node_read_lock(node);
1921 spin_lock_bh(&le->lock);
1922 link = node->links[bearer_id].link;
1923 if (!link) {
1924 spin_unlock_bh(&le->lock);
1925 tipc_node_read_unlock(node);
1926 return -EINVAL;
1927 }
1928 tipc_link_reset_stats(link);
1929 spin_unlock_bh(&le->lock);
1930 tipc_node_read_unlock(node);
1931 return 0;
1932}
1933
1934/* Caller should hold node lock */
1935static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
1936 struct tipc_node *node, u32 *prev_link)
1937{
1938 u32 i;
1939 int err;
1940
1941 for (i = *prev_link; i < MAX_BEARERS; i++) {
1942 *prev_link = i;
1943
1944 if (!node->links[i].link)
1945 continue;
1946
1947 err = __tipc_nl_add_link(net, msg,
1948 node->links[i].link, NLM_F_MULTI);
1949 if (err)
1950 return err;
1951 }
1952 *prev_link = 0;
1953
1954 return 0;
1955}
1956
1957int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
1958{
1959 struct net *net = sock_net(skb->sk);
1960 struct tipc_net *tn = net_generic(net, tipc_net_id);
1961 struct tipc_node *node;
1962 struct tipc_nl_msg msg;
1963 u32 prev_node = cb->args[0];
1964 u32 prev_link = cb->args[1];
1965 int done = cb->args[2];
1966 int err;
1967
1968 if (done)
1969 return 0;
1970
1971 msg.skb = skb;
1972 msg.portid = NETLINK_CB(cb->skb).portid;
1973 msg.seq = cb->nlh->nlmsg_seq;
1974
1975 rcu_read_lock();
1976 if (prev_node) {
1977 node = tipc_node_find(net, prev_node);
1978 if (!node) {
1979 /* We never set seq or call nl_dump_check_consistent()
1980 * this means that setting prev_seq here will cause the
1981 * consistence check to fail in the netlink callback
1982 * handler. Resulting in the last NLMSG_DONE message
1983 * having the NLM_F_DUMP_INTR flag set.
1984 */
1985 cb->prev_seq = 1;
1986 goto out;
1987 }
1988 tipc_node_put(node);
1989
1990 list_for_each_entry_continue_rcu(node, &tn->node_list,
1991 list) {
1992 tipc_node_read_lock(node);
1993 err = __tipc_nl_add_node_links(net, &msg, node,
1994 &prev_link);
1995 tipc_node_read_unlock(node);
1996 if (err)
1997 goto out;
1998
1999 prev_node = node->addr;
2000 }
2001 } else {
2002 err = tipc_nl_add_bc_link(net, &msg);
2003 if (err)
2004 goto out;
2005
2006 list_for_each_entry_rcu(node, &tn->node_list, list) {
2007 tipc_node_read_lock(node);
2008 err = __tipc_nl_add_node_links(net, &msg, node,
2009 &prev_link);
2010 tipc_node_read_unlock(node);
2011 if (err)
2012 goto out;
2013
2014 prev_node = node->addr;
2015 }
2016 }
2017 done = 1;
2018out:
2019 rcu_read_unlock();
2020
2021 cb->args[0] = prev_node;
2022 cb->args[1] = prev_link;
2023 cb->args[2] = done;
2024
2025 return skb->len;
2026}
2027
2028int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2029{
2030 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2031 struct net *net = sock_net(skb->sk);
2032 int err;
2033
2034 if (!info->attrs[TIPC_NLA_MON])
2035 return -EINVAL;
2036
2037 err = nla_parse_nested(attrs, TIPC_NLA_MON_MAX,
2038 info->attrs[TIPC_NLA_MON],
2039 tipc_nl_monitor_policy);
2040 if (err)
2041 return err;
2042
2043 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2044 u32 val;
2045
2046 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2047 err = tipc_nl_monitor_set_threshold(net, val);
2048 if (err)
2049 return err;
2050 }
2051
2052 return 0;
2053}
2054
2055static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2056{
2057 struct nlattr *attrs;
2058 void *hdr;
2059 u32 val;
2060
2061 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2062 0, TIPC_NL_MON_GET);
2063 if (!hdr)
2064 return -EMSGSIZE;
2065
2066 attrs = nla_nest_start(msg->skb, TIPC_NLA_MON);
2067 if (!attrs)
2068 goto msg_full;
2069
2070 val = tipc_nl_monitor_get_threshold(net);
2071
2072 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2073 goto attr_msg_full;
2074
2075 nla_nest_end(msg->skb, attrs);
2076 genlmsg_end(msg->skb, hdr);
2077
2078 return 0;
2079
2080attr_msg_full:
2081 nla_nest_cancel(msg->skb, attrs);
2082msg_full:
2083 genlmsg_cancel(msg->skb, hdr);
2084
2085 return -EMSGSIZE;
2086}
2087
2088int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2089{
2090 struct net *net = sock_net(skb->sk);
2091 struct tipc_nl_msg msg;
2092 int err;
2093
2094 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2095 msg.portid = info->snd_portid;
2096 msg.seq = info->snd_seq;
2097
2098 err = __tipc_nl_add_monitor_prop(net, &msg);
2099 if (err) {
2100 nlmsg_free(msg.skb);
2101 return err;
2102 }
2103
2104 return genlmsg_reply(msg.skb, info);
2105}
2106
2107int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2108{
2109 struct net *net = sock_net(skb->sk);
2110 u32 prev_bearer = cb->args[0];
2111 struct tipc_nl_msg msg;
2112 int err;
2113 int i;
2114
2115 if (prev_bearer == MAX_BEARERS)
2116 return 0;
2117
2118 msg.skb = skb;
2119 msg.portid = NETLINK_CB(cb->skb).portid;
2120 msg.seq = cb->nlh->nlmsg_seq;
2121
2122 rtnl_lock();
2123 for (i = prev_bearer; i < MAX_BEARERS; i++) {
2124 prev_bearer = i;
2125 err = __tipc_nl_add_monitor(net, &msg, prev_bearer);
2126 if (err)
2127 goto out;
2128 }
2129
2130out:
2131 rtnl_unlock();
2132 cb->args[0] = prev_bearer;
2133
2134 return skb->len;
2135}
2136
2137int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2138 struct netlink_callback *cb)
2139{
2140 struct net *net = sock_net(skb->sk);
2141 u32 prev_node = cb->args[1];
2142 u32 bearer_id = cb->args[2];
2143 int done = cb->args[0];
2144 struct tipc_nl_msg msg;
2145 int err;
2146
2147 if (!prev_node) {
2148 struct nlattr **attrs;
2149 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2150
2151 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2152 if (err)
2153 return err;
2154
2155 if (!attrs[TIPC_NLA_MON])
2156 return -EINVAL;
2157
2158 err = nla_parse_nested(mon, TIPC_NLA_MON_MAX,
2159 attrs[TIPC_NLA_MON],
2160 tipc_nl_monitor_policy);
2161 if (err)
2162 return err;
2163
2164 if (!mon[TIPC_NLA_MON_REF])
2165 return -EINVAL;
2166
2167 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2168
2169 if (bearer_id >= MAX_BEARERS)
2170 return -EINVAL;
2171 }
2172
2173 if (done)
2174 return 0;
2175
2176 msg.skb = skb;
2177 msg.portid = NETLINK_CB(cb->skb).portid;
2178 msg.seq = cb->nlh->nlmsg_seq;
2179
2180 rtnl_lock();
2181 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2182 if (!err)
2183 done = 1;
2184
2185 rtnl_unlock();
2186 cb->args[0] = done;
2187 cb->args[1] = prev_node;
2188 cb->args[2] = bearer_id;
2189
2190 return skb->len;
2191}