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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, node;
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 = tipc_own_addr(net);
417 node = n->addr;
418 bearer_id = n->link_id & 0xffff;
419 publ_list = &n->publ_list;
420
421 n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
422 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
423
424 write_unlock_bh(&n->lock);
425
426 if (flags & TIPC_NOTIFY_NODE_DOWN)
427 tipc_publ_notify(net, publ_list, node, n->capabilities);
428
429 if (flags & TIPC_NOTIFY_NODE_UP)
430 tipc_named_node_up(net, node, n->capabilities);
431
432 if (flags & TIPC_NOTIFY_LINK_UP) {
433 tipc_mon_peer_up(net, node, bearer_id);
434 tipc_nametbl_publish(net, &ua, &sk, sk.ref);
435 }
436 if (flags & TIPC_NOTIFY_LINK_DOWN) {
437 tipc_mon_peer_down(net, node, bearer_id);
438 tipc_nametbl_withdraw(net, &ua, &sk, sk.ref);
439 }
440}
441
442static void tipc_node_assign_peer_net(struct tipc_node *n, u32 hash_mixes)
443{
444 int net_id = tipc_netid(n->net);
445 struct tipc_net *tn_peer;
446 struct net *tmp;
447 u32 hash_chk;
448
449 if (n->peer_net)
450 return;
451
452 for_each_net_rcu(tmp) {
453 tn_peer = tipc_net(tmp);
454 if (!tn_peer)
455 continue;
456 /* Integrity checking whether node exists in namespace or not */
457 if (tn_peer->net_id != net_id)
458 continue;
459 if (memcmp(n->peer_id, tn_peer->node_id, NODE_ID_LEN))
460 continue;
461 hash_chk = tipc_net_hash_mixes(tmp, tn_peer->random);
462 if (hash_mixes ^ hash_chk)
463 continue;
464 n->peer_net = tmp;
465 n->peer_hash_mix = hash_mixes;
466 break;
467 }
468}
469
470struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
471 u16 capabilities, u32 hash_mixes,
472 bool preliminary)
473{
474 struct tipc_net *tn = net_generic(net, tipc_net_id);
475 struct tipc_link *l, *snd_l = tipc_bc_sndlink(net);
476 struct tipc_node *n, *temp_node;
477 unsigned long intv;
478 int bearer_id;
479 int i;
480
481 spin_lock_bh(&tn->node_list_lock);
482 n = tipc_node_find(net, addr) ?:
483 tipc_node_find_by_id(net, peer_id);
484 if (n) {
485 if (!n->preliminary)
486 goto update;
487 if (preliminary)
488 goto exit;
489 /* A preliminary node becomes "real" now, refresh its data */
490 tipc_node_write_lock(n);
491 if (!tipc_link_bc_create(net, tipc_own_addr(net), addr, peer_id, U16_MAX,
492 tipc_link_min_win(snd_l), tipc_link_max_win(snd_l),
493 n->capabilities, &n->bc_entry.inputq1,
494 &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) {
495 pr_warn("Broadcast rcv link refresh failed, no memory\n");
496 tipc_node_write_unlock_fast(n);
497 tipc_node_put(n);
498 n = NULL;
499 goto exit;
500 }
501 n->preliminary = false;
502 n->addr = addr;
503 hlist_del_rcu(&n->hash);
504 hlist_add_head_rcu(&n->hash,
505 &tn->node_htable[tipc_hashfn(addr)]);
506 list_del_rcu(&n->list);
507 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
508 if (n->addr < temp_node->addr)
509 break;
510 }
511 list_add_tail_rcu(&n->list, &temp_node->list);
512 tipc_node_write_unlock_fast(n);
513
514update:
515 if (n->peer_hash_mix ^ hash_mixes)
516 tipc_node_assign_peer_net(n, hash_mixes);
517 if (n->capabilities == capabilities)
518 goto exit;
519 /* Same node may come back with new capabilities */
520 tipc_node_write_lock(n);
521 n->capabilities = capabilities;
522 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
523 l = n->links[bearer_id].link;
524 if (l)
525 tipc_link_update_caps(l, capabilities);
526 }
527 tipc_node_write_unlock_fast(n);
528
529 /* Calculate cluster capabilities */
530 tn->capabilities = TIPC_NODE_CAPABILITIES;
531 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
532 tn->capabilities &= temp_node->capabilities;
533 }
534
535 tipc_bcast_toggle_rcast(net,
536 (tn->capabilities & TIPC_BCAST_RCAST));
537
538 goto exit;
539 }
540 n = kzalloc(sizeof(*n), GFP_ATOMIC);
541 if (!n) {
542 pr_warn("Node creation failed, no memory\n");
543 goto exit;
544 }
545 tipc_nodeid2string(n->peer_id_string, peer_id);
546#ifdef CONFIG_TIPC_CRYPTO
547 if (unlikely(tipc_crypto_start(&n->crypto_rx, net, n))) {
548 pr_warn("Failed to start crypto RX(%s)!\n", n->peer_id_string);
549 kfree(n);
550 n = NULL;
551 goto exit;
552 }
553#endif
554 n->addr = addr;
555 n->preliminary = preliminary;
556 memcpy(&n->peer_id, peer_id, 16);
557 n->net = net;
558 n->peer_net = NULL;
559 n->peer_hash_mix = 0;
560 /* Assign kernel local namespace if exists */
561 tipc_node_assign_peer_net(n, hash_mixes);
562 n->capabilities = capabilities;
563 kref_init(&n->kref);
564 rwlock_init(&n->lock);
565 INIT_HLIST_NODE(&n->hash);
566 INIT_LIST_HEAD(&n->list);
567 INIT_LIST_HEAD(&n->publ_list);
568 INIT_LIST_HEAD(&n->conn_sks);
569 skb_queue_head_init(&n->bc_entry.namedq);
570 skb_queue_head_init(&n->bc_entry.inputq1);
571 __skb_queue_head_init(&n->bc_entry.arrvq);
572 skb_queue_head_init(&n->bc_entry.inputq2);
573 for (i = 0; i < MAX_BEARERS; i++)
574 spin_lock_init(&n->links[i].lock);
575 n->state = SELF_DOWN_PEER_LEAVING;
576 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
577 n->signature = INVALID_NODE_SIG;
578 n->active_links[0] = INVALID_BEARER_ID;
579 n->active_links[1] = INVALID_BEARER_ID;
580 if (!preliminary &&
581 !tipc_link_bc_create(net, tipc_own_addr(net), addr, peer_id, U16_MAX,
582 tipc_link_min_win(snd_l), tipc_link_max_win(snd_l),
583 n->capabilities, &n->bc_entry.inputq1,
584 &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) {
585 pr_warn("Broadcast rcv link creation failed, no memory\n");
586 tipc_node_put(n);
587 n = NULL;
588 goto exit;
589 }
590 tipc_node_get(n);
591 timer_setup(&n->timer, tipc_node_timeout, 0);
592 /* Start a slow timer anyway, crypto needs it */
593 n->keepalive_intv = 10000;
594 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
595 if (!mod_timer(&n->timer, intv))
596 tipc_node_get(n);
597 hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
598 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
599 if (n->addr < temp_node->addr)
600 break;
601 }
602 list_add_tail_rcu(&n->list, &temp_node->list);
603 /* Calculate cluster capabilities */
604 tn->capabilities = TIPC_NODE_CAPABILITIES;
605 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
606 tn->capabilities &= temp_node->capabilities;
607 }
608 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
609 trace_tipc_node_create(n, true, " ");
610exit:
611 spin_unlock_bh(&tn->node_list_lock);
612 return n;
613}
614
615static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
616{
617 unsigned long tol = tipc_link_tolerance(l);
618 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
619
620 /* Link with lowest tolerance determines timer interval */
621 if (intv < n->keepalive_intv)
622 n->keepalive_intv = intv;
623
624 /* Ensure link's abort limit corresponds to current tolerance */
625 tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
626}
627
628static void tipc_node_delete_from_list(struct tipc_node *node)
629{
630#ifdef CONFIG_TIPC_CRYPTO
631 tipc_crypto_key_flush(node->crypto_rx);
632#endif
633 list_del_rcu(&node->list);
634 hlist_del_rcu(&node->hash);
635 tipc_node_put(node);
636}
637
638static void tipc_node_delete(struct tipc_node *node)
639{
640 trace_tipc_node_delete(node, true, " ");
641 tipc_node_delete_from_list(node);
642
643 del_timer_sync(&node->timer);
644 tipc_node_put(node);
645}
646
647void tipc_node_stop(struct net *net)
648{
649 struct tipc_net *tn = tipc_net(net);
650 struct tipc_node *node, *t_node;
651
652 spin_lock_bh(&tn->node_list_lock);
653 list_for_each_entry_safe(node, t_node, &tn->node_list, list)
654 tipc_node_delete(node);
655 spin_unlock_bh(&tn->node_list_lock);
656}
657
658void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
659{
660 struct tipc_node *n;
661
662 if (in_own_node(net, addr))
663 return;
664
665 n = tipc_node_find(net, addr);
666 if (!n) {
667 pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
668 return;
669 }
670 tipc_node_write_lock(n);
671 list_add_tail(subscr, &n->publ_list);
672 tipc_node_write_unlock_fast(n);
673 tipc_node_put(n);
674}
675
676void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
677{
678 struct tipc_node *n;
679
680 if (in_own_node(net, addr))
681 return;
682
683 n = tipc_node_find(net, addr);
684 if (!n) {
685 pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
686 return;
687 }
688 tipc_node_write_lock(n);
689 list_del_init(subscr);
690 tipc_node_write_unlock_fast(n);
691 tipc_node_put(n);
692}
693
694int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
695{
696 struct tipc_node *node;
697 struct tipc_sock_conn *conn;
698 int err = 0;
699
700 if (in_own_node(net, dnode))
701 return 0;
702
703 node = tipc_node_find(net, dnode);
704 if (!node) {
705 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
706 return -EHOSTUNREACH;
707 }
708 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
709 if (!conn) {
710 err = -EHOSTUNREACH;
711 goto exit;
712 }
713 conn->peer_node = dnode;
714 conn->port = port;
715 conn->peer_port = peer_port;
716
717 tipc_node_write_lock(node);
718 list_add_tail(&conn->list, &node->conn_sks);
719 tipc_node_write_unlock(node);
720exit:
721 tipc_node_put(node);
722 return err;
723}
724
725void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
726{
727 struct tipc_node *node;
728 struct tipc_sock_conn *conn, *safe;
729
730 if (in_own_node(net, dnode))
731 return;
732
733 node = tipc_node_find(net, dnode);
734 if (!node)
735 return;
736
737 tipc_node_write_lock(node);
738 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
739 if (port != conn->port)
740 continue;
741 list_del(&conn->list);
742 kfree(conn);
743 }
744 tipc_node_write_unlock(node);
745 tipc_node_put(node);
746}
747
748static void tipc_node_clear_links(struct tipc_node *node)
749{
750 int i;
751
752 for (i = 0; i < MAX_BEARERS; i++) {
753 struct tipc_link_entry *le = &node->links[i];
754
755 if (le->link) {
756 kfree(le->link);
757 le->link = NULL;
758 node->link_cnt--;
759 }
760 }
761}
762
763/* tipc_node_cleanup - delete nodes that does not
764 * have active links for NODE_CLEANUP_AFTER time
765 */
766static bool tipc_node_cleanup(struct tipc_node *peer)
767{
768 struct tipc_node *temp_node;
769 struct tipc_net *tn = tipc_net(peer->net);
770 bool deleted = false;
771
772 /* If lock held by tipc_node_stop() the node will be deleted anyway */
773 if (!spin_trylock_bh(&tn->node_list_lock))
774 return false;
775
776 tipc_node_write_lock(peer);
777
778 if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) {
779 tipc_node_clear_links(peer);
780 tipc_node_delete_from_list(peer);
781 deleted = true;
782 }
783 tipc_node_write_unlock(peer);
784
785 if (!deleted) {
786 spin_unlock_bh(&tn->node_list_lock);
787 return deleted;
788 }
789
790 /* Calculate cluster capabilities */
791 tn->capabilities = TIPC_NODE_CAPABILITIES;
792 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
793 tn->capabilities &= temp_node->capabilities;
794 }
795 tipc_bcast_toggle_rcast(peer->net,
796 (tn->capabilities & TIPC_BCAST_RCAST));
797 spin_unlock_bh(&tn->node_list_lock);
798 return deleted;
799}
800
801/* tipc_node_timeout - handle expiration of node timer
802 */
803static void tipc_node_timeout(struct timer_list *t)
804{
805 struct tipc_node *n = from_timer(n, t, timer);
806 struct tipc_link_entry *le;
807 struct sk_buff_head xmitq;
808 int remains = n->link_cnt;
809 int bearer_id;
810 int rc = 0;
811
812 trace_tipc_node_timeout(n, false, " ");
813 if (!node_is_up(n) && tipc_node_cleanup(n)) {
814 /*Removing the reference of Timer*/
815 tipc_node_put(n);
816 return;
817 }
818
819#ifdef CONFIG_TIPC_CRYPTO
820 /* Take any crypto key related actions first */
821 tipc_crypto_timeout(n->crypto_rx);
822#endif
823 __skb_queue_head_init(&xmitq);
824
825 /* Initial node interval to value larger (10 seconds), then it will be
826 * recalculated with link lowest tolerance
827 */
828 tipc_node_read_lock(n);
829 n->keepalive_intv = 10000;
830 tipc_node_read_unlock(n);
831 for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) {
832 tipc_node_read_lock(n);
833 le = &n->links[bearer_id];
834 if (le->link) {
835 spin_lock_bh(&le->lock);
836 /* Link tolerance may change asynchronously: */
837 tipc_node_calculate_timer(n, le->link);
838 rc = tipc_link_timeout(le->link, &xmitq);
839 spin_unlock_bh(&le->lock);
840 remains--;
841 }
842 tipc_node_read_unlock(n);
843 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr, n);
844 if (rc & TIPC_LINK_DOWN_EVT)
845 tipc_node_link_down(n, bearer_id, false);
846 }
847 mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
848}
849
850/**
851 * __tipc_node_link_up - handle addition of link
852 * @n: target tipc_node
853 * @bearer_id: id of the bearer
854 * @xmitq: queue for messages to be xmited on
855 * Node lock must be held by caller
856 * Link becomes active (alone or shared) or standby, depending on its priority.
857 */
858static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
859 struct sk_buff_head *xmitq)
860{
861 int *slot0 = &n->active_links[0];
862 int *slot1 = &n->active_links[1];
863 struct tipc_link *ol = node_active_link(n, 0);
864 struct tipc_link *nl = n->links[bearer_id].link;
865
866 if (!nl || tipc_link_is_up(nl))
867 return;
868
869 tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
870 if (!tipc_link_is_up(nl))
871 return;
872
873 n->working_links++;
874 n->action_flags |= TIPC_NOTIFY_LINK_UP;
875 n->link_id = tipc_link_id(nl);
876
877 /* Leave room for tunnel header when returning 'mtu' to users: */
878 n->links[bearer_id].mtu = tipc_link_mss(nl);
879
880 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
881 tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
882
883 pr_debug("Established link <%s> on network plane %c\n",
884 tipc_link_name(nl), tipc_link_plane(nl));
885 trace_tipc_node_link_up(n, true, " ");
886
887 /* Ensure that a STATE message goes first */
888 tipc_link_build_state_msg(nl, xmitq);
889
890 /* First link? => give it both slots */
891 if (!ol) {
892 *slot0 = bearer_id;
893 *slot1 = bearer_id;
894 tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
895 n->action_flags |= TIPC_NOTIFY_NODE_UP;
896 tipc_link_set_active(nl, true);
897 tipc_bcast_add_peer(n->net, nl, xmitq);
898 return;
899 }
900
901 /* Second link => redistribute slots */
902 if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
903 pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
904 *slot0 = bearer_id;
905 *slot1 = bearer_id;
906 tipc_link_set_active(nl, true);
907 tipc_link_set_active(ol, false);
908 } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
909 tipc_link_set_active(nl, true);
910 *slot1 = bearer_id;
911 } else {
912 pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
913 }
914
915 /* Prepare synchronization with first link */
916 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
917}
918
919/**
920 * tipc_node_link_up - handle addition of link
921 * @n: target tipc_node
922 * @bearer_id: id of the bearer
923 * @xmitq: queue for messages to be xmited on
924 *
925 * Link becomes active (alone or shared) or standby, depending on its priority.
926 */
927static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
928 struct sk_buff_head *xmitq)
929{
930 struct tipc_media_addr *maddr;
931
932 tipc_node_write_lock(n);
933 __tipc_node_link_up(n, bearer_id, xmitq);
934 maddr = &n->links[bearer_id].maddr;
935 tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr, n);
936 tipc_node_write_unlock(n);
937}
938
939/**
940 * tipc_node_link_failover() - start failover in case "half-failover"
941 *
942 * This function is only called in a very special situation where link
943 * failover can be already started on peer node but not on this node.
944 * This can happen when e.g.::
945 *
946 * 1. Both links <1A-2A>, <1B-2B> down
947 * 2. Link endpoint 2A up, but 1A still down (e.g. due to network
948 * disturbance, wrong session, etc.)
949 * 3. Link <1B-2B> up
950 * 4. Link endpoint 2A down (e.g. due to link tolerance timeout)
951 * 5. Node 2 starts failover onto link <1B-2B>
952 *
953 * ==> Node 1 does never start link/node failover!
954 *
955 * @n: tipc node structure
956 * @l: link peer endpoint failingover (- can be NULL)
957 * @tnl: tunnel link
958 * @xmitq: queue for messages to be xmited on tnl link later
959 */
960static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,
961 struct tipc_link *tnl,
962 struct sk_buff_head *xmitq)
963{
964 /* Avoid to be "self-failover" that can never end */
965 if (!tipc_link_is_up(tnl))
966 return;
967
968 /* Don't rush, failure link may be in the process of resetting */
969 if (l && !tipc_link_is_reset(l))
970 return;
971
972 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
973 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
974
975 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
976 tipc_link_failover_prepare(l, tnl, xmitq);
977
978 if (l)
979 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
980 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
981}
982
983/**
984 * __tipc_node_link_down - handle loss of link
985 * @n: target tipc_node
986 * @bearer_id: id of the bearer
987 * @xmitq: queue for messages to be xmited on
988 * @maddr: output media address of the bearer
989 */
990static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
991 struct sk_buff_head *xmitq,
992 struct tipc_media_addr **maddr)
993{
994 struct tipc_link_entry *le = &n->links[*bearer_id];
995 int *slot0 = &n->active_links[0];
996 int *slot1 = &n->active_links[1];
997 int i, highest = 0, prio;
998 struct tipc_link *l, *_l, *tnl;
999
1000 l = n->links[*bearer_id].link;
1001 if (!l || tipc_link_is_reset(l))
1002 return;
1003
1004 n->working_links--;
1005 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
1006 n->link_id = tipc_link_id(l);
1007
1008 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
1009
1010 pr_debug("Lost link <%s> on network plane %c\n",
1011 tipc_link_name(l), tipc_link_plane(l));
1012
1013 /* Select new active link if any available */
1014 *slot0 = INVALID_BEARER_ID;
1015 *slot1 = INVALID_BEARER_ID;
1016 for (i = 0; i < MAX_BEARERS; i++) {
1017 _l = n->links[i].link;
1018 if (!_l || !tipc_link_is_up(_l))
1019 continue;
1020 if (_l == l)
1021 continue;
1022 prio = tipc_link_prio(_l);
1023 if (prio < highest)
1024 continue;
1025 if (prio > highest) {
1026 highest = prio;
1027 *slot0 = i;
1028 *slot1 = i;
1029 continue;
1030 }
1031 *slot1 = i;
1032 }
1033
1034 if (!node_is_up(n)) {
1035 if (tipc_link_peer_is_down(l))
1036 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1037 tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
1038 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!");
1039 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1040 tipc_link_reset(l);
1041 tipc_link_build_reset_msg(l, xmitq);
1042 *maddr = &n->links[*bearer_id].maddr;
1043 node_lost_contact(n, &le->inputq);
1044 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1045 return;
1046 }
1047 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1048
1049 /* There is still a working link => initiate failover */
1050 *bearer_id = n->active_links[0];
1051 tnl = n->links[*bearer_id].link;
1052 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1053 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1054 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
1055 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
1056 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!");
1057 tipc_link_reset(l);
1058 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1059 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1060 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
1061 *maddr = &n->links[*bearer_id].maddr;
1062}
1063
1064static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
1065{
1066 struct tipc_link_entry *le = &n->links[bearer_id];
1067 struct tipc_media_addr *maddr = NULL;
1068 struct tipc_link *l = le->link;
1069 int old_bearer_id = bearer_id;
1070 struct sk_buff_head xmitq;
1071
1072 if (!l)
1073 return;
1074
1075 __skb_queue_head_init(&xmitq);
1076
1077 tipc_node_write_lock(n);
1078 if (!tipc_link_is_establishing(l)) {
1079 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
1080 } else {
1081 /* Defuse pending tipc_node_link_up() */
1082 tipc_link_reset(l);
1083 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1084 }
1085 if (delete) {
1086 kfree(l);
1087 le->link = NULL;
1088 n->link_cnt--;
1089 }
1090 trace_tipc_node_link_down(n, true, "node link down or deleted!");
1091 tipc_node_write_unlock(n);
1092 if (delete)
1093 tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
1094 if (!skb_queue_empty(&xmitq))
1095 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr, n);
1096 tipc_sk_rcv(n->net, &le->inputq);
1097}
1098
1099static bool node_is_up(struct tipc_node *n)
1100{
1101 return n->active_links[0] != INVALID_BEARER_ID;
1102}
1103
1104bool tipc_node_is_up(struct net *net, u32 addr)
1105{
1106 struct tipc_node *n;
1107 bool retval = false;
1108
1109 if (in_own_node(net, addr))
1110 return true;
1111
1112 n = tipc_node_find(net, addr);
1113 if (!n)
1114 return false;
1115 retval = node_is_up(n);
1116 tipc_node_put(n);
1117 return retval;
1118}
1119
1120static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
1121{
1122 struct tipc_node *n;
1123
1124 addr ^= tipc_net(net)->random;
1125 while ((n = tipc_node_find(net, addr))) {
1126 tipc_node_put(n);
1127 addr++;
1128 }
1129 return addr;
1130}
1131
1132/* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
1133 * Returns suggested address if any, otherwise 0
1134 */
1135u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
1136{
1137 struct tipc_net *tn = tipc_net(net);
1138 struct tipc_node *n;
1139 bool preliminary;
1140 u32 sugg_addr;
1141
1142 /* Suggest new address if some other peer is using this one */
1143 n = tipc_node_find(net, addr);
1144 if (n) {
1145 if (!memcmp(n->peer_id, id, NODE_ID_LEN))
1146 addr = 0;
1147 tipc_node_put(n);
1148 if (!addr)
1149 return 0;
1150 return tipc_node_suggest_addr(net, addr);
1151 }
1152
1153 /* Suggest previously used address if peer is known */
1154 n = tipc_node_find_by_id(net, id);
1155 if (n) {
1156 sugg_addr = n->addr;
1157 preliminary = n->preliminary;
1158 tipc_node_put(n);
1159 if (!preliminary)
1160 return sugg_addr;
1161 }
1162
1163 /* Even this node may be in conflict */
1164 if (tn->trial_addr == addr)
1165 return tipc_node_suggest_addr(net, addr);
1166
1167 return 0;
1168}
1169
1170void tipc_node_check_dest(struct net *net, u32 addr,
1171 u8 *peer_id, struct tipc_bearer *b,
1172 u16 capabilities, u32 signature, u32 hash_mixes,
1173 struct tipc_media_addr *maddr,
1174 bool *respond, bool *dupl_addr)
1175{
1176 struct tipc_node *n;
1177 struct tipc_link *l;
1178 struct tipc_link_entry *le;
1179 bool addr_match = false;
1180 bool sign_match = false;
1181 bool link_up = false;
1182 bool link_is_reset = false;
1183 bool accept_addr = false;
1184 bool reset = false;
1185 char *if_name;
1186 unsigned long intv;
1187 u16 session;
1188
1189 *dupl_addr = false;
1190 *respond = false;
1191
1192 n = tipc_node_create(net, addr, peer_id, capabilities, hash_mixes,
1193 false);
1194 if (!n)
1195 return;
1196
1197 tipc_node_write_lock(n);
1198
1199 le = &n->links[b->identity];
1200
1201 /* Prepare to validate requesting node's signature and media address */
1202 l = le->link;
1203 link_up = l && tipc_link_is_up(l);
1204 link_is_reset = l && tipc_link_is_reset(l);
1205 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
1206 sign_match = (signature == n->signature);
1207
1208 /* These three flags give us eight permutations: */
1209
1210 if (sign_match && addr_match && link_up) {
1211 /* All is fine. Ignore requests. */
1212 /* Peer node is not a container/local namespace */
1213 if (!n->peer_hash_mix)
1214 n->peer_hash_mix = hash_mixes;
1215 } else if (sign_match && addr_match && !link_up) {
1216 /* Respond. The link will come up in due time */
1217 *respond = true;
1218 } else if (sign_match && !addr_match && link_up) {
1219 /* Peer has changed i/f address without rebooting.
1220 * If so, the link will reset soon, and the next
1221 * discovery will be accepted. So we can ignore it.
1222 * It may also be a cloned or malicious peer having
1223 * chosen the same node address and signature as an
1224 * existing one.
1225 * Ignore requests until the link goes down, if ever.
1226 */
1227 *dupl_addr = true;
1228 } else if (sign_match && !addr_match && !link_up) {
1229 /* Peer link has changed i/f address without rebooting.
1230 * It may also be a cloned or malicious peer; we can't
1231 * distinguish between the two.
1232 * The signature is correct, so we must accept.
1233 */
1234 accept_addr = true;
1235 *respond = true;
1236 reset = true;
1237 } else if (!sign_match && addr_match && link_up) {
1238 /* Peer node rebooted. Two possibilities:
1239 * - Delayed re-discovery; this link endpoint has already
1240 * reset and re-established contact with the peer, before
1241 * receiving a discovery message from that node.
1242 * (The peer happened to receive one from this node first).
1243 * - The peer came back so fast that our side has not
1244 * discovered it yet. Probing from this side will soon
1245 * reset the link, since there can be no working link
1246 * endpoint at the peer end, and the link will re-establish.
1247 * Accept the signature, since it comes from a known peer.
1248 */
1249 n->signature = signature;
1250 } else if (!sign_match && addr_match && !link_up) {
1251 /* The peer node has rebooted.
1252 * Accept signature, since it is a known peer.
1253 */
1254 n->signature = signature;
1255 *respond = true;
1256 } else if (!sign_match && !addr_match && link_up) {
1257 /* Peer rebooted with new address, or a new/duplicate peer.
1258 * Ignore until the link goes down, if ever.
1259 */
1260 *dupl_addr = true;
1261 } else if (!sign_match && !addr_match && !link_up) {
1262 /* Peer rebooted with new address, or it is a new peer.
1263 * Accept signature and address.
1264 */
1265 n->signature = signature;
1266 accept_addr = true;
1267 *respond = true;
1268 reset = true;
1269 }
1270
1271 if (!accept_addr)
1272 goto exit;
1273
1274 /* Now create new link if not already existing */
1275 if (!l) {
1276 if (n->link_cnt == 2)
1277 goto exit;
1278
1279 if_name = strchr(b->name, ':') + 1;
1280 get_random_bytes(&session, sizeof(u16));
1281 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
1282 b->net_plane, b->mtu, b->priority,
1283 b->min_win, b->max_win, session,
1284 tipc_own_addr(net), addr, peer_id,
1285 n->capabilities,
1286 tipc_bc_sndlink(n->net), n->bc_entry.link,
1287 &le->inputq,
1288 &n->bc_entry.namedq, &l)) {
1289 *respond = false;
1290 goto exit;
1291 }
1292 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!");
1293 tipc_link_reset(l);
1294 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1295 if (n->state == NODE_FAILINGOVER)
1296 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1297 link_is_reset = tipc_link_is_reset(l);
1298 le->link = l;
1299 n->link_cnt++;
1300 tipc_node_calculate_timer(n, l);
1301 if (n->link_cnt == 1) {
1302 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
1303 if (!mod_timer(&n->timer, intv))
1304 tipc_node_get(n);
1305 }
1306 }
1307 memcpy(&le->maddr, maddr, sizeof(*maddr));
1308exit:
1309 tipc_node_write_unlock(n);
1310 if (reset && !link_is_reset)
1311 tipc_node_link_down(n, b->identity, false);
1312 tipc_node_put(n);
1313}
1314
1315void tipc_node_delete_links(struct net *net, int bearer_id)
1316{
1317 struct tipc_net *tn = net_generic(net, tipc_net_id);
1318 struct tipc_node *n;
1319
1320 rcu_read_lock();
1321 list_for_each_entry_rcu(n, &tn->node_list, list) {
1322 tipc_node_link_down(n, bearer_id, true);
1323 }
1324 rcu_read_unlock();
1325}
1326
1327static void tipc_node_reset_links(struct tipc_node *n)
1328{
1329 int i;
1330
1331 pr_warn("Resetting all links to %x\n", n->addr);
1332
1333 trace_tipc_node_reset_links(n, true, " ");
1334 for (i = 0; i < MAX_BEARERS; i++) {
1335 tipc_node_link_down(n, i, false);
1336 }
1337}
1338
1339/* tipc_node_fsm_evt - node finite state machine
1340 * Determines when contact is allowed with peer node
1341 */
1342static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
1343{
1344 int state = n->state;
1345
1346 switch (state) {
1347 case SELF_DOWN_PEER_DOWN:
1348 switch (evt) {
1349 case SELF_ESTABL_CONTACT_EVT:
1350 state = SELF_UP_PEER_COMING;
1351 break;
1352 case PEER_ESTABL_CONTACT_EVT:
1353 state = SELF_COMING_PEER_UP;
1354 break;
1355 case SELF_LOST_CONTACT_EVT:
1356 case PEER_LOST_CONTACT_EVT:
1357 break;
1358 case NODE_SYNCH_END_EVT:
1359 case NODE_SYNCH_BEGIN_EVT:
1360 case NODE_FAILOVER_BEGIN_EVT:
1361 case NODE_FAILOVER_END_EVT:
1362 default:
1363 goto illegal_evt;
1364 }
1365 break;
1366 case SELF_UP_PEER_UP:
1367 switch (evt) {
1368 case SELF_LOST_CONTACT_EVT:
1369 state = SELF_DOWN_PEER_LEAVING;
1370 break;
1371 case PEER_LOST_CONTACT_EVT:
1372 state = SELF_LEAVING_PEER_DOWN;
1373 break;
1374 case NODE_SYNCH_BEGIN_EVT:
1375 state = NODE_SYNCHING;
1376 break;
1377 case NODE_FAILOVER_BEGIN_EVT:
1378 state = NODE_FAILINGOVER;
1379 break;
1380 case SELF_ESTABL_CONTACT_EVT:
1381 case PEER_ESTABL_CONTACT_EVT:
1382 case NODE_SYNCH_END_EVT:
1383 case NODE_FAILOVER_END_EVT:
1384 break;
1385 default:
1386 goto illegal_evt;
1387 }
1388 break;
1389 case SELF_DOWN_PEER_LEAVING:
1390 switch (evt) {
1391 case PEER_LOST_CONTACT_EVT:
1392 state = SELF_DOWN_PEER_DOWN;
1393 break;
1394 case SELF_ESTABL_CONTACT_EVT:
1395 case PEER_ESTABL_CONTACT_EVT:
1396 case SELF_LOST_CONTACT_EVT:
1397 break;
1398 case NODE_SYNCH_END_EVT:
1399 case NODE_SYNCH_BEGIN_EVT:
1400 case NODE_FAILOVER_BEGIN_EVT:
1401 case NODE_FAILOVER_END_EVT:
1402 default:
1403 goto illegal_evt;
1404 }
1405 break;
1406 case SELF_UP_PEER_COMING:
1407 switch (evt) {
1408 case PEER_ESTABL_CONTACT_EVT:
1409 state = SELF_UP_PEER_UP;
1410 break;
1411 case SELF_LOST_CONTACT_EVT:
1412 state = SELF_DOWN_PEER_DOWN;
1413 break;
1414 case SELF_ESTABL_CONTACT_EVT:
1415 case PEER_LOST_CONTACT_EVT:
1416 case NODE_SYNCH_END_EVT:
1417 case NODE_FAILOVER_BEGIN_EVT:
1418 break;
1419 case NODE_SYNCH_BEGIN_EVT:
1420 case NODE_FAILOVER_END_EVT:
1421 default:
1422 goto illegal_evt;
1423 }
1424 break;
1425 case SELF_COMING_PEER_UP:
1426 switch (evt) {
1427 case SELF_ESTABL_CONTACT_EVT:
1428 state = SELF_UP_PEER_UP;
1429 break;
1430 case PEER_LOST_CONTACT_EVT:
1431 state = SELF_DOWN_PEER_DOWN;
1432 break;
1433 case SELF_LOST_CONTACT_EVT:
1434 case PEER_ESTABL_CONTACT_EVT:
1435 break;
1436 case NODE_SYNCH_END_EVT:
1437 case NODE_SYNCH_BEGIN_EVT:
1438 case NODE_FAILOVER_BEGIN_EVT:
1439 case NODE_FAILOVER_END_EVT:
1440 default:
1441 goto illegal_evt;
1442 }
1443 break;
1444 case SELF_LEAVING_PEER_DOWN:
1445 switch (evt) {
1446 case SELF_LOST_CONTACT_EVT:
1447 state = SELF_DOWN_PEER_DOWN;
1448 break;
1449 case SELF_ESTABL_CONTACT_EVT:
1450 case PEER_ESTABL_CONTACT_EVT:
1451 case PEER_LOST_CONTACT_EVT:
1452 break;
1453 case NODE_SYNCH_END_EVT:
1454 case NODE_SYNCH_BEGIN_EVT:
1455 case NODE_FAILOVER_BEGIN_EVT:
1456 case NODE_FAILOVER_END_EVT:
1457 default:
1458 goto illegal_evt;
1459 }
1460 break;
1461 case NODE_FAILINGOVER:
1462 switch (evt) {
1463 case SELF_LOST_CONTACT_EVT:
1464 state = SELF_DOWN_PEER_LEAVING;
1465 break;
1466 case PEER_LOST_CONTACT_EVT:
1467 state = SELF_LEAVING_PEER_DOWN;
1468 break;
1469 case NODE_FAILOVER_END_EVT:
1470 state = SELF_UP_PEER_UP;
1471 break;
1472 case NODE_FAILOVER_BEGIN_EVT:
1473 case SELF_ESTABL_CONTACT_EVT:
1474 case PEER_ESTABL_CONTACT_EVT:
1475 break;
1476 case NODE_SYNCH_BEGIN_EVT:
1477 case NODE_SYNCH_END_EVT:
1478 default:
1479 goto illegal_evt;
1480 }
1481 break;
1482 case NODE_SYNCHING:
1483 switch (evt) {
1484 case SELF_LOST_CONTACT_EVT:
1485 state = SELF_DOWN_PEER_LEAVING;
1486 break;
1487 case PEER_LOST_CONTACT_EVT:
1488 state = SELF_LEAVING_PEER_DOWN;
1489 break;
1490 case NODE_SYNCH_END_EVT:
1491 state = SELF_UP_PEER_UP;
1492 break;
1493 case NODE_FAILOVER_BEGIN_EVT:
1494 state = NODE_FAILINGOVER;
1495 break;
1496 case NODE_SYNCH_BEGIN_EVT:
1497 case SELF_ESTABL_CONTACT_EVT:
1498 case PEER_ESTABL_CONTACT_EVT:
1499 break;
1500 case NODE_FAILOVER_END_EVT:
1501 default:
1502 goto illegal_evt;
1503 }
1504 break;
1505 default:
1506 pr_err("Unknown node fsm state %x\n", state);
1507 break;
1508 }
1509 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1510 n->state = state;
1511 return;
1512
1513illegal_evt:
1514 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1515 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1516}
1517
1518static void node_lost_contact(struct tipc_node *n,
1519 struct sk_buff_head *inputq)
1520{
1521 struct tipc_sock_conn *conn, *safe;
1522 struct tipc_link *l;
1523 struct list_head *conns = &n->conn_sks;
1524 struct sk_buff *skb;
1525 uint i;
1526
1527 pr_debug("Lost contact with %x\n", n->addr);
1528 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
1529 trace_tipc_node_lost_contact(n, true, " ");
1530
1531 /* Clean up broadcast state */
1532 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1533 skb_queue_purge(&n->bc_entry.namedq);
1534
1535 /* Abort any ongoing link failover */
1536 for (i = 0; i < MAX_BEARERS; i++) {
1537 l = n->links[i].link;
1538 if (l)
1539 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1540 }
1541
1542 /* Notify publications from this node */
1543 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1544 n->peer_net = NULL;
1545 n->peer_hash_mix = 0;
1546 /* Notify sockets connected to node */
1547 list_for_each_entry_safe(conn, safe, conns, list) {
1548 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1549 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1550 conn->peer_node, conn->port,
1551 conn->peer_port, TIPC_ERR_NO_NODE);
1552 if (likely(skb))
1553 skb_queue_tail(inputq, skb);
1554 list_del(&conn->list);
1555 kfree(conn);
1556 }
1557}
1558
1559/**
1560 * tipc_node_get_linkname - get the name of a link
1561 *
1562 * @net: the applicable net namespace
1563 * @bearer_id: id of the bearer
1564 * @addr: peer node address
1565 * @linkname: link name output buffer
1566 * @len: size of @linkname output buffer
1567 *
1568 * Return: 0 on success
1569 */
1570int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1571 char *linkname, size_t len)
1572{
1573 struct tipc_link *link;
1574 int err = -EINVAL;
1575 struct tipc_node *node = tipc_node_find(net, addr);
1576
1577 if (!node)
1578 return err;
1579
1580 if (bearer_id >= MAX_BEARERS)
1581 goto exit;
1582
1583 tipc_node_read_lock(node);
1584 link = node->links[bearer_id].link;
1585 if (link) {
1586 strncpy(linkname, tipc_link_name(link), len);
1587 err = 0;
1588 }
1589 tipc_node_read_unlock(node);
1590exit:
1591 tipc_node_put(node);
1592 return err;
1593}
1594
1595/* Caller should hold node lock for the passed node */
1596static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1597{
1598 void *hdr;
1599 struct nlattr *attrs;
1600
1601 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1602 NLM_F_MULTI, TIPC_NL_NODE_GET);
1603 if (!hdr)
1604 return -EMSGSIZE;
1605
1606 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NODE);
1607 if (!attrs)
1608 goto msg_full;
1609
1610 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1611 goto attr_msg_full;
1612 if (node_is_up(node))
1613 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1614 goto attr_msg_full;
1615
1616 nla_nest_end(msg->skb, attrs);
1617 genlmsg_end(msg->skb, hdr);
1618
1619 return 0;
1620
1621attr_msg_full:
1622 nla_nest_cancel(msg->skb, attrs);
1623msg_full:
1624 genlmsg_cancel(msg->skb, hdr);
1625
1626 return -EMSGSIZE;
1627}
1628
1629static void tipc_lxc_xmit(struct net *peer_net, struct sk_buff_head *list)
1630{
1631 struct tipc_msg *hdr = buf_msg(skb_peek(list));
1632 struct sk_buff_head inputq;
1633
1634 switch (msg_user(hdr)) {
1635 case TIPC_LOW_IMPORTANCE:
1636 case TIPC_MEDIUM_IMPORTANCE:
1637 case TIPC_HIGH_IMPORTANCE:
1638 case TIPC_CRITICAL_IMPORTANCE:
1639 if (msg_connected(hdr) || msg_named(hdr) ||
1640 msg_direct(hdr)) {
1641 tipc_loopback_trace(peer_net, list);
1642 spin_lock_init(&list->lock);
1643 tipc_sk_rcv(peer_net, list);
1644 return;
1645 }
1646 if (msg_mcast(hdr)) {
1647 tipc_loopback_trace(peer_net, list);
1648 skb_queue_head_init(&inputq);
1649 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1650 __skb_queue_purge(list);
1651 skb_queue_purge(&inputq);
1652 return;
1653 }
1654 return;
1655 case MSG_FRAGMENTER:
1656 if (tipc_msg_assemble(list)) {
1657 tipc_loopback_trace(peer_net, list);
1658 skb_queue_head_init(&inputq);
1659 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1660 __skb_queue_purge(list);
1661 skb_queue_purge(&inputq);
1662 }
1663 return;
1664 case GROUP_PROTOCOL:
1665 case CONN_MANAGER:
1666 tipc_loopback_trace(peer_net, list);
1667 spin_lock_init(&list->lock);
1668 tipc_sk_rcv(peer_net, list);
1669 return;
1670 case LINK_PROTOCOL:
1671 case NAME_DISTRIBUTOR:
1672 case TUNNEL_PROTOCOL:
1673 case BCAST_PROTOCOL:
1674 return;
1675 default:
1676 return;
1677 }
1678}
1679
1680/**
1681 * tipc_node_xmit() - general link level function for message sending
1682 * @net: the applicable net namespace
1683 * @list: chain of buffers containing message
1684 * @dnode: address of destination node
1685 * @selector: a number used for deterministic link selection
1686 * Consumes the buffer chain.
1687 * Return: 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1688 */
1689int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1690 u32 dnode, int selector)
1691{
1692 struct tipc_link_entry *le = NULL;
1693 struct tipc_node *n;
1694 struct sk_buff_head xmitq;
1695 bool node_up = false;
1696 struct net *peer_net;
1697 int bearer_id;
1698 int rc;
1699
1700 if (in_own_node(net, dnode)) {
1701 tipc_loopback_trace(net, list);
1702 spin_lock_init(&list->lock);
1703 tipc_sk_rcv(net, list);
1704 return 0;
1705 }
1706
1707 n = tipc_node_find(net, dnode);
1708 if (unlikely(!n)) {
1709 __skb_queue_purge(list);
1710 return -EHOSTUNREACH;
1711 }
1712
1713 rcu_read_lock();
1714 tipc_node_read_lock(n);
1715 node_up = node_is_up(n);
1716 peer_net = n->peer_net;
1717 tipc_node_read_unlock(n);
1718 if (node_up && peer_net && check_net(peer_net)) {
1719 /* xmit inner linux container */
1720 tipc_lxc_xmit(peer_net, list);
1721 if (likely(skb_queue_empty(list))) {
1722 rcu_read_unlock();
1723 tipc_node_put(n);
1724 return 0;
1725 }
1726 }
1727 rcu_read_unlock();
1728
1729 tipc_node_read_lock(n);
1730 bearer_id = n->active_links[selector & 1];
1731 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1732 tipc_node_read_unlock(n);
1733 tipc_node_put(n);
1734 __skb_queue_purge(list);
1735 return -EHOSTUNREACH;
1736 }
1737
1738 __skb_queue_head_init(&xmitq);
1739 le = &n->links[bearer_id];
1740 spin_lock_bh(&le->lock);
1741 rc = tipc_link_xmit(le->link, list, &xmitq);
1742 spin_unlock_bh(&le->lock);
1743 tipc_node_read_unlock(n);
1744
1745 if (unlikely(rc == -ENOBUFS))
1746 tipc_node_link_down(n, bearer_id, false);
1747 else
1748 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1749
1750 tipc_node_put(n);
1751
1752 return rc;
1753}
1754
1755/* tipc_node_xmit_skb(): send single buffer to destination
1756 * Buffers sent via this function are generally TIPC_SYSTEM_IMPORTANCE
1757 * messages, which will not be rejected
1758 * The only exception is datagram messages rerouted after secondary
1759 * lookup, which are rare and safe to dispose of anyway.
1760 */
1761int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1762 u32 selector)
1763{
1764 struct sk_buff_head head;
1765
1766 __skb_queue_head_init(&head);
1767 __skb_queue_tail(&head, skb);
1768 tipc_node_xmit(net, &head, dnode, selector);
1769 return 0;
1770}
1771
1772/* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1773 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1774 */
1775int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1776{
1777 struct sk_buff *skb;
1778 u32 selector, dnode;
1779
1780 while ((skb = __skb_dequeue(xmitq))) {
1781 selector = msg_origport(buf_msg(skb));
1782 dnode = msg_destnode(buf_msg(skb));
1783 tipc_node_xmit_skb(net, skb, dnode, selector);
1784 }
1785 return 0;
1786}
1787
1788void tipc_node_broadcast(struct net *net, struct sk_buff *skb, int rc_dests)
1789{
1790 struct sk_buff_head xmitq;
1791 struct sk_buff *txskb;
1792 struct tipc_node *n;
1793 u16 dummy;
1794 u32 dst;
1795
1796 /* Use broadcast if all nodes support it */
1797 if (!rc_dests && tipc_bcast_get_mode(net) != BCLINK_MODE_RCAST) {
1798 __skb_queue_head_init(&xmitq);
1799 __skb_queue_tail(&xmitq, skb);
1800 tipc_bcast_xmit(net, &xmitq, &dummy);
1801 return;
1802 }
1803
1804 /* Otherwise use legacy replicast method */
1805 rcu_read_lock();
1806 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1807 dst = n->addr;
1808 if (in_own_node(net, dst))
1809 continue;
1810 if (!node_is_up(n))
1811 continue;
1812 txskb = pskb_copy(skb, GFP_ATOMIC);
1813 if (!txskb)
1814 break;
1815 msg_set_destnode(buf_msg(txskb), dst);
1816 tipc_node_xmit_skb(net, txskb, dst, 0);
1817 }
1818 rcu_read_unlock();
1819 kfree_skb(skb);
1820}
1821
1822static void tipc_node_mcast_rcv(struct tipc_node *n)
1823{
1824 struct tipc_bclink_entry *be = &n->bc_entry;
1825
1826 /* 'arrvq' is under inputq2's lock protection */
1827 spin_lock_bh(&be->inputq2.lock);
1828 spin_lock_bh(&be->inputq1.lock);
1829 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1830 spin_unlock_bh(&be->inputq1.lock);
1831 spin_unlock_bh(&be->inputq2.lock);
1832 tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1833}
1834
1835static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1836 int bearer_id, struct sk_buff_head *xmitq)
1837{
1838 struct tipc_link *ucl;
1839 int rc;
1840
1841 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr, xmitq);
1842
1843 if (rc & TIPC_LINK_DOWN_EVT) {
1844 tipc_node_reset_links(n);
1845 return;
1846 }
1847
1848 if (!(rc & TIPC_LINK_SND_STATE))
1849 return;
1850
1851 /* If probe message, a STATE response will be sent anyway */
1852 if (msg_probe(hdr))
1853 return;
1854
1855 /* Produce a STATE message carrying broadcast NACK */
1856 tipc_node_read_lock(n);
1857 ucl = n->links[bearer_id].link;
1858 if (ucl)
1859 tipc_link_build_state_msg(ucl, xmitq);
1860 tipc_node_read_unlock(n);
1861}
1862
1863/**
1864 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1865 * @net: the applicable net namespace
1866 * @skb: TIPC packet
1867 * @bearer_id: id of bearer message arrived on
1868 *
1869 * Invoked with no locks held.
1870 */
1871static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1872{
1873 int rc;
1874 struct sk_buff_head xmitq;
1875 struct tipc_bclink_entry *be;
1876 struct tipc_link_entry *le;
1877 struct tipc_msg *hdr = buf_msg(skb);
1878 int usr = msg_user(hdr);
1879 u32 dnode = msg_destnode(hdr);
1880 struct tipc_node *n;
1881
1882 __skb_queue_head_init(&xmitq);
1883
1884 /* If NACK for other node, let rcv link for that node peek into it */
1885 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1886 n = tipc_node_find(net, dnode);
1887 else
1888 n = tipc_node_find(net, msg_prevnode(hdr));
1889 if (!n) {
1890 kfree_skb(skb);
1891 return;
1892 }
1893 be = &n->bc_entry;
1894 le = &n->links[bearer_id];
1895
1896 rc = tipc_bcast_rcv(net, be->link, skb);
1897
1898 /* Broadcast ACKs are sent on a unicast link */
1899 if (rc & TIPC_LINK_SND_STATE) {
1900 tipc_node_read_lock(n);
1901 tipc_link_build_state_msg(le->link, &xmitq);
1902 tipc_node_read_unlock(n);
1903 }
1904
1905 if (!skb_queue_empty(&xmitq))
1906 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1907
1908 if (!skb_queue_empty(&be->inputq1))
1909 tipc_node_mcast_rcv(n);
1910
1911 /* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
1912 if (!skb_queue_empty(&n->bc_entry.namedq))
1913 tipc_named_rcv(net, &n->bc_entry.namedq,
1914 &n->bc_entry.named_rcv_nxt,
1915 &n->bc_entry.named_open);
1916
1917 /* If reassembly or retransmission failure => reset all links to peer */
1918 if (rc & TIPC_LINK_DOWN_EVT)
1919 tipc_node_reset_links(n);
1920
1921 tipc_node_put(n);
1922}
1923
1924/**
1925 * tipc_node_check_state - check and if necessary update node state
1926 * @n: target tipc_node
1927 * @skb: TIPC packet
1928 * @bearer_id: identity of bearer delivering the packet
1929 * @xmitq: queue for messages to be xmited on
1930 * Return: true if state and msg are ok, otherwise false
1931 */
1932static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1933 int bearer_id, struct sk_buff_head *xmitq)
1934{
1935 struct tipc_msg *hdr = buf_msg(skb);
1936 int usr = msg_user(hdr);
1937 int mtyp = msg_type(hdr);
1938 u16 oseqno = msg_seqno(hdr);
1939 u16 exp_pkts = msg_msgcnt(hdr);
1940 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1941 int state = n->state;
1942 struct tipc_link *l, *tnl, *pl = NULL;
1943 struct tipc_media_addr *maddr;
1944 int pb_id;
1945
1946 if (trace_tipc_node_check_state_enabled()) {
1947 trace_tipc_skb_dump(skb, false, "skb for node state check");
1948 trace_tipc_node_check_state(n, true, " ");
1949 }
1950 l = n->links[bearer_id].link;
1951 if (!l)
1952 return false;
1953 rcv_nxt = tipc_link_rcv_nxt(l);
1954
1955
1956 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1957 return true;
1958
1959 /* Find parallel link, if any */
1960 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1961 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1962 pl = n->links[pb_id].link;
1963 break;
1964 }
1965 }
1966
1967 if (!tipc_link_validate_msg(l, hdr)) {
1968 trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
1969 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
1970 return false;
1971 }
1972
1973 /* Check and update node accesibility if applicable */
1974 if (state == SELF_UP_PEER_COMING) {
1975 if (!tipc_link_is_up(l))
1976 return true;
1977 if (!msg_peer_link_is_up(hdr))
1978 return true;
1979 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1980 }
1981
1982 if (state == SELF_DOWN_PEER_LEAVING) {
1983 if (msg_peer_node_is_up(hdr))
1984 return false;
1985 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1986 return true;
1987 }
1988
1989 if (state == SELF_LEAVING_PEER_DOWN)
1990 return false;
1991
1992 /* Ignore duplicate packets */
1993 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1994 return true;
1995
1996 /* Initiate or update failover mode if applicable */
1997 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1998 syncpt = oseqno + exp_pkts - 1;
1999 if (pl && !tipc_link_is_reset(pl)) {
2000 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
2001 trace_tipc_node_link_down(n, true,
2002 "node link down <- failover!");
2003 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
2004 tipc_link_inputq(l));
2005 }
2006
2007 /* If parallel link was already down, and this happened before
2008 * the tunnel link came up, node failover was never started.
2009 * Ensure that a FAILOVER_MSG is sent to get peer out of
2010 * NODE_FAILINGOVER state, also this node must accept
2011 * TUNNEL_MSGs from peer.
2012 */
2013 if (n->state != NODE_FAILINGOVER)
2014 tipc_node_link_failover(n, pl, l, xmitq);
2015
2016 /* If pkts arrive out of order, use lowest calculated syncpt */
2017 if (less(syncpt, n->sync_point))
2018 n->sync_point = syncpt;
2019 }
2020
2021 /* Open parallel link when tunnel link reaches synch point */
2022 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
2023 if (!more(rcv_nxt, n->sync_point))
2024 return true;
2025 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
2026 if (pl)
2027 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
2028 return true;
2029 }
2030
2031 /* No syncing needed if only one link */
2032 if (!pl || !tipc_link_is_up(pl))
2033 return true;
2034
2035 /* Initiate synch mode if applicable */
2036 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
2037 if (n->capabilities & TIPC_TUNNEL_ENHANCED)
2038 syncpt = msg_syncpt(hdr);
2039 else
2040 syncpt = msg_seqno(msg_inner_hdr(hdr)) + exp_pkts - 1;
2041 if (!tipc_link_is_up(l))
2042 __tipc_node_link_up(n, bearer_id, xmitq);
2043 if (n->state == SELF_UP_PEER_UP) {
2044 n->sync_point = syncpt;
2045 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
2046 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
2047 }
2048 }
2049
2050 /* Open tunnel link when parallel link reaches synch point */
2051 if (n->state == NODE_SYNCHING) {
2052 if (tipc_link_is_synching(l)) {
2053 tnl = l;
2054 } else {
2055 tnl = pl;
2056 pl = l;
2057 }
2058 inputq_len = skb_queue_len(tipc_link_inputq(pl));
2059 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
2060 if (more(dlv_nxt, n->sync_point)) {
2061 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
2062 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
2063 return true;
2064 }
2065 if (l == pl)
2066 return true;
2067 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
2068 return true;
2069 if (usr == LINK_PROTOCOL)
2070 return true;
2071 return false;
2072 }
2073 return true;
2074}
2075
2076/**
2077 * tipc_rcv - process TIPC packets/messages arriving from off-node
2078 * @net: the applicable net namespace
2079 * @skb: TIPC packet
2080 * @b: pointer to bearer message arrived on
2081 *
2082 * Invoked with no locks held. Bearer pointer must point to a valid bearer
2083 * structure (i.e. cannot be NULL), but bearer can be inactive.
2084 */
2085void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
2086{
2087 struct sk_buff_head xmitq;
2088 struct tipc_link_entry *le;
2089 struct tipc_msg *hdr;
2090 struct tipc_node *n;
2091 int bearer_id = b->identity;
2092 u32 self = tipc_own_addr(net);
2093 int usr, rc = 0;
2094 u16 bc_ack;
2095#ifdef CONFIG_TIPC_CRYPTO
2096 struct tipc_ehdr *ehdr;
2097
2098 /* Check if message must be decrypted first */
2099 if (TIPC_SKB_CB(skb)->decrypted || !tipc_ehdr_validate(skb))
2100 goto rcv;
2101
2102 ehdr = (struct tipc_ehdr *)skb->data;
2103 if (likely(ehdr->user != LINK_CONFIG)) {
2104 n = tipc_node_find(net, ntohl(ehdr->addr));
2105 if (unlikely(!n))
2106 goto discard;
2107 } else {
2108 n = tipc_node_find_by_id(net, ehdr->id);
2109 }
2110 tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b);
2111 if (!skb)
2112 return;
2113
2114rcv:
2115#endif
2116 /* Ensure message is well-formed before touching the header */
2117 if (unlikely(!tipc_msg_validate(&skb)))
2118 goto discard;
2119 __skb_queue_head_init(&xmitq);
2120 hdr = buf_msg(skb);
2121 usr = msg_user(hdr);
2122 bc_ack = msg_bcast_ack(hdr);
2123
2124 /* Handle arrival of discovery or broadcast packet */
2125 if (unlikely(msg_non_seq(hdr))) {
2126 if (unlikely(usr == LINK_CONFIG))
2127 return tipc_disc_rcv(net, skb, b);
2128 else
2129 return tipc_node_bc_rcv(net, skb, bearer_id);
2130 }
2131
2132 /* Discard unicast link messages destined for another node */
2133 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
2134 goto discard;
2135
2136 /* Locate neighboring node that sent packet */
2137 n = tipc_node_find(net, msg_prevnode(hdr));
2138 if (unlikely(!n))
2139 goto discard;
2140 le = &n->links[bearer_id];
2141
2142 /* Ensure broadcast reception is in synch with peer's send state */
2143 if (unlikely(usr == LINK_PROTOCOL)) {
2144 if (unlikely(skb_linearize(skb))) {
2145 tipc_node_put(n);
2146 goto discard;
2147 }
2148 hdr = buf_msg(skb);
2149 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
2150 } else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack)) {
2151 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
2152 }
2153
2154 /* Receive packet directly if conditions permit */
2155 tipc_node_read_lock(n);
2156 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
2157 spin_lock_bh(&le->lock);
2158 if (le->link) {
2159 rc = tipc_link_rcv(le->link, skb, &xmitq);
2160 skb = NULL;
2161 }
2162 spin_unlock_bh(&le->lock);
2163 }
2164 tipc_node_read_unlock(n);
2165
2166 /* Check/update node state before receiving */
2167 if (unlikely(skb)) {
2168 if (unlikely(skb_linearize(skb)))
2169 goto out_node_put;
2170 tipc_node_write_lock(n);
2171 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
2172 if (le->link) {
2173 rc = tipc_link_rcv(le->link, skb, &xmitq);
2174 skb = NULL;
2175 }
2176 }
2177 tipc_node_write_unlock(n);
2178 }
2179
2180 if (unlikely(rc & TIPC_LINK_UP_EVT))
2181 tipc_node_link_up(n, bearer_id, &xmitq);
2182
2183 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
2184 tipc_node_link_down(n, bearer_id, false);
2185
2186 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
2187 tipc_named_rcv(net, &n->bc_entry.namedq,
2188 &n->bc_entry.named_rcv_nxt,
2189 &n->bc_entry.named_open);
2190
2191 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
2192 tipc_node_mcast_rcv(n);
2193
2194 if (!skb_queue_empty(&le->inputq))
2195 tipc_sk_rcv(net, &le->inputq);
2196
2197 if (!skb_queue_empty(&xmitq))
2198 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
2199
2200out_node_put:
2201 tipc_node_put(n);
2202discard:
2203 kfree_skb(skb);
2204}
2205
2206void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
2207 int prop)
2208{
2209 struct tipc_net *tn = tipc_net(net);
2210 int bearer_id = b->identity;
2211 struct sk_buff_head xmitq;
2212 struct tipc_link_entry *e;
2213 struct tipc_node *n;
2214
2215 __skb_queue_head_init(&xmitq);
2216
2217 rcu_read_lock();
2218
2219 list_for_each_entry_rcu(n, &tn->node_list, list) {
2220 tipc_node_write_lock(n);
2221 e = &n->links[bearer_id];
2222 if (e->link) {
2223 if (prop == TIPC_NLA_PROP_TOL)
2224 tipc_link_set_tolerance(e->link, b->tolerance,
2225 &xmitq);
2226 else if (prop == TIPC_NLA_PROP_MTU)
2227 tipc_link_set_mtu(e->link, b->mtu);
2228
2229 /* Update MTU for node link entry */
2230 e->mtu = tipc_link_mss(e->link);
2231 }
2232
2233 tipc_node_write_unlock(n);
2234 tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
2235 }
2236
2237 rcu_read_unlock();
2238}
2239
2240int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
2241{
2242 struct net *net = sock_net(skb->sk);
2243 struct tipc_net *tn = net_generic(net, tipc_net_id);
2244 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
2245 struct tipc_node *peer, *temp_node;
2246 u8 node_id[NODE_ID_LEN];
2247 u64 *w0 = (u64 *)&node_id[0];
2248 u64 *w1 = (u64 *)&node_id[8];
2249 u32 addr;
2250 int err;
2251
2252 /* We identify the peer by its net */
2253 if (!info->attrs[TIPC_NLA_NET])
2254 return -EINVAL;
2255
2256 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
2257 info->attrs[TIPC_NLA_NET],
2258 tipc_nl_net_policy, info->extack);
2259 if (err)
2260 return err;
2261
2262 /* attrs[TIPC_NLA_NET_NODEID] and attrs[TIPC_NLA_NET_ADDR] are
2263 * mutually exclusive cases
2264 */
2265 if (attrs[TIPC_NLA_NET_ADDR]) {
2266 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
2267 if (!addr)
2268 return -EINVAL;
2269 }
2270
2271 if (attrs[TIPC_NLA_NET_NODEID]) {
2272 if (!attrs[TIPC_NLA_NET_NODEID_W1])
2273 return -EINVAL;
2274 *w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
2275 *w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
2276 addr = hash128to32(node_id);
2277 }
2278
2279 if (in_own_node(net, addr))
2280 return -ENOTSUPP;
2281
2282 spin_lock_bh(&tn->node_list_lock);
2283 peer = tipc_node_find(net, addr);
2284 if (!peer) {
2285 spin_unlock_bh(&tn->node_list_lock);
2286 return -ENXIO;
2287 }
2288
2289 tipc_node_write_lock(peer);
2290 if (peer->state != SELF_DOWN_PEER_DOWN &&
2291 peer->state != SELF_DOWN_PEER_LEAVING) {
2292 tipc_node_write_unlock(peer);
2293 err = -EBUSY;
2294 goto err_out;
2295 }
2296
2297 tipc_node_clear_links(peer);
2298 tipc_node_write_unlock(peer);
2299 tipc_node_delete(peer);
2300
2301 /* Calculate cluster capabilities */
2302 tn->capabilities = TIPC_NODE_CAPABILITIES;
2303 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
2304 tn->capabilities &= temp_node->capabilities;
2305 }
2306 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
2307 err = 0;
2308err_out:
2309 tipc_node_put(peer);
2310 spin_unlock_bh(&tn->node_list_lock);
2311
2312 return err;
2313}
2314
2315int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
2316{
2317 int err;
2318 struct net *net = sock_net(skb->sk);
2319 struct tipc_net *tn = net_generic(net, tipc_net_id);
2320 int done = cb->args[0];
2321 int last_addr = cb->args[1];
2322 struct tipc_node *node;
2323 struct tipc_nl_msg msg;
2324
2325 if (done)
2326 return 0;
2327
2328 msg.skb = skb;
2329 msg.portid = NETLINK_CB(cb->skb).portid;
2330 msg.seq = cb->nlh->nlmsg_seq;
2331
2332 rcu_read_lock();
2333 if (last_addr) {
2334 node = tipc_node_find(net, last_addr);
2335 if (!node) {
2336 rcu_read_unlock();
2337 /* We never set seq or call nl_dump_check_consistent()
2338 * this means that setting prev_seq here will cause the
2339 * consistence check to fail in the netlink callback
2340 * handler. Resulting in the NLMSG_DONE message having
2341 * the NLM_F_DUMP_INTR flag set if the node state
2342 * changed while we released the lock.
2343 */
2344 cb->prev_seq = 1;
2345 return -EPIPE;
2346 }
2347 tipc_node_put(node);
2348 }
2349
2350 list_for_each_entry_rcu(node, &tn->node_list, list) {
2351 if (node->preliminary)
2352 continue;
2353 if (last_addr) {
2354 if (node->addr == last_addr)
2355 last_addr = 0;
2356 else
2357 continue;
2358 }
2359
2360 tipc_node_read_lock(node);
2361 err = __tipc_nl_add_node(&msg, node);
2362 if (err) {
2363 last_addr = node->addr;
2364 tipc_node_read_unlock(node);
2365 goto out;
2366 }
2367
2368 tipc_node_read_unlock(node);
2369 }
2370 done = 1;
2371out:
2372 cb->args[0] = done;
2373 cb->args[1] = last_addr;
2374 rcu_read_unlock();
2375
2376 return skb->len;
2377}
2378
2379/* tipc_node_find_by_name - locate owner node of link by link's name
2380 * @net: the applicable net namespace
2381 * @name: pointer to link name string
2382 * @bearer_id: pointer to index in 'node->links' array where the link was found.
2383 *
2384 * Returns pointer to node owning the link, or 0 if no matching link is found.
2385 */
2386static struct tipc_node *tipc_node_find_by_name(struct net *net,
2387 const char *link_name,
2388 unsigned int *bearer_id)
2389{
2390 struct tipc_net *tn = net_generic(net, tipc_net_id);
2391 struct tipc_link *l;
2392 struct tipc_node *n;
2393 struct tipc_node *found_node = NULL;
2394 int i;
2395
2396 *bearer_id = 0;
2397 rcu_read_lock();
2398 list_for_each_entry_rcu(n, &tn->node_list, list) {
2399 tipc_node_read_lock(n);
2400 for (i = 0; i < MAX_BEARERS; i++) {
2401 l = n->links[i].link;
2402 if (l && !strcmp(tipc_link_name(l), link_name)) {
2403 *bearer_id = i;
2404 found_node = n;
2405 break;
2406 }
2407 }
2408 tipc_node_read_unlock(n);
2409 if (found_node)
2410 break;
2411 }
2412 rcu_read_unlock();
2413
2414 return found_node;
2415}
2416
2417int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
2418{
2419 int err;
2420 int res = 0;
2421 int bearer_id;
2422 char *name;
2423 struct tipc_link *link;
2424 struct tipc_node *node;
2425 struct sk_buff_head xmitq;
2426 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2427 struct net *net = sock_net(skb->sk);
2428
2429 __skb_queue_head_init(&xmitq);
2430
2431 if (!info->attrs[TIPC_NLA_LINK])
2432 return -EINVAL;
2433
2434 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2435 info->attrs[TIPC_NLA_LINK],
2436 tipc_nl_link_policy, info->extack);
2437 if (err)
2438 return err;
2439
2440 if (!attrs[TIPC_NLA_LINK_NAME])
2441 return -EINVAL;
2442
2443 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2444
2445 if (strcmp(name, tipc_bclink_name) == 0)
2446 return tipc_nl_bc_link_set(net, attrs);
2447
2448 node = tipc_node_find_by_name(net, name, &bearer_id);
2449 if (!node)
2450 return -EINVAL;
2451
2452 tipc_node_read_lock(node);
2453
2454 link = node->links[bearer_id].link;
2455 if (!link) {
2456 res = -EINVAL;
2457 goto out;
2458 }
2459
2460 if (attrs[TIPC_NLA_LINK_PROP]) {
2461 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2462
2463 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
2464 if (err) {
2465 res = err;
2466 goto out;
2467 }
2468
2469 if (props[TIPC_NLA_PROP_TOL]) {
2470 u32 tol;
2471
2472 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2473 tipc_link_set_tolerance(link, tol, &xmitq);
2474 }
2475 if (props[TIPC_NLA_PROP_PRIO]) {
2476 u32 prio;
2477
2478 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2479 tipc_link_set_prio(link, prio, &xmitq);
2480 }
2481 if (props[TIPC_NLA_PROP_WIN]) {
2482 u32 max_win;
2483
2484 max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2485 tipc_link_set_queue_limits(link,
2486 tipc_link_min_win(link),
2487 max_win);
2488 }
2489 }
2490
2491out:
2492 tipc_node_read_unlock(node);
2493 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr,
2494 NULL);
2495 return res;
2496}
2497
2498int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
2499{
2500 struct net *net = genl_info_net(info);
2501 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2502 struct tipc_nl_msg msg;
2503 char *name;
2504 int err;
2505
2506 msg.portid = info->snd_portid;
2507 msg.seq = info->snd_seq;
2508
2509 if (!info->attrs[TIPC_NLA_LINK])
2510 return -EINVAL;
2511
2512 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2513 info->attrs[TIPC_NLA_LINK],
2514 tipc_nl_link_policy, info->extack);
2515 if (err)
2516 return err;
2517
2518 if (!attrs[TIPC_NLA_LINK_NAME])
2519 return -EINVAL;
2520
2521 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2522
2523 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2524 if (!msg.skb)
2525 return -ENOMEM;
2526
2527 if (strcmp(name, tipc_bclink_name) == 0) {
2528 err = tipc_nl_add_bc_link(net, &msg, tipc_net(net)->bcl);
2529 if (err)
2530 goto err_free;
2531 } else {
2532 int bearer_id;
2533 struct tipc_node *node;
2534 struct tipc_link *link;
2535
2536 node = tipc_node_find_by_name(net, name, &bearer_id);
2537 if (!node) {
2538 err = -EINVAL;
2539 goto err_free;
2540 }
2541
2542 tipc_node_read_lock(node);
2543 link = node->links[bearer_id].link;
2544 if (!link) {
2545 tipc_node_read_unlock(node);
2546 err = -EINVAL;
2547 goto err_free;
2548 }
2549
2550 err = __tipc_nl_add_link(net, &msg, link, 0);
2551 tipc_node_read_unlock(node);
2552 if (err)
2553 goto err_free;
2554 }
2555
2556 return genlmsg_reply(msg.skb, info);
2557
2558err_free:
2559 nlmsg_free(msg.skb);
2560 return err;
2561}
2562
2563int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2564{
2565 int err;
2566 char *link_name;
2567 unsigned int bearer_id;
2568 struct tipc_link *link;
2569 struct tipc_node *node;
2570 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2571 struct net *net = sock_net(skb->sk);
2572 struct tipc_net *tn = tipc_net(net);
2573 struct tipc_link_entry *le;
2574
2575 if (!info->attrs[TIPC_NLA_LINK])
2576 return -EINVAL;
2577
2578 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2579 info->attrs[TIPC_NLA_LINK],
2580 tipc_nl_link_policy, info->extack);
2581 if (err)
2582 return err;
2583
2584 if (!attrs[TIPC_NLA_LINK_NAME])
2585 return -EINVAL;
2586
2587 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2588
2589 err = -EINVAL;
2590 if (!strcmp(link_name, tipc_bclink_name)) {
2591 err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
2592 if (err)
2593 return err;
2594 return 0;
2595 } else if (strstr(link_name, tipc_bclink_name)) {
2596 rcu_read_lock();
2597 list_for_each_entry_rcu(node, &tn->node_list, list) {
2598 tipc_node_read_lock(node);
2599 link = node->bc_entry.link;
2600 if (link && !strcmp(link_name, tipc_link_name(link))) {
2601 err = tipc_bclink_reset_stats(net, link);
2602 tipc_node_read_unlock(node);
2603 break;
2604 }
2605 tipc_node_read_unlock(node);
2606 }
2607 rcu_read_unlock();
2608 return err;
2609 }
2610
2611 node = tipc_node_find_by_name(net, link_name, &bearer_id);
2612 if (!node)
2613 return -EINVAL;
2614
2615 le = &node->links[bearer_id];
2616 tipc_node_read_lock(node);
2617 spin_lock_bh(&le->lock);
2618 link = node->links[bearer_id].link;
2619 if (!link) {
2620 spin_unlock_bh(&le->lock);
2621 tipc_node_read_unlock(node);
2622 return -EINVAL;
2623 }
2624 tipc_link_reset_stats(link);
2625 spin_unlock_bh(&le->lock);
2626 tipc_node_read_unlock(node);
2627 return 0;
2628}
2629
2630/* Caller should hold node lock */
2631static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2632 struct tipc_node *node, u32 *prev_link,
2633 bool bc_link)
2634{
2635 u32 i;
2636 int err;
2637
2638 for (i = *prev_link; i < MAX_BEARERS; i++) {
2639 *prev_link = i;
2640
2641 if (!node->links[i].link)
2642 continue;
2643
2644 err = __tipc_nl_add_link(net, msg,
2645 node->links[i].link, NLM_F_MULTI);
2646 if (err)
2647 return err;
2648 }
2649
2650 if (bc_link) {
2651 *prev_link = i;
2652 err = tipc_nl_add_bc_link(net, msg, node->bc_entry.link);
2653 if (err)
2654 return err;
2655 }
2656
2657 *prev_link = 0;
2658
2659 return 0;
2660}
2661
2662int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2663{
2664 struct net *net = sock_net(skb->sk);
2665 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
2666 struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
2667 struct tipc_net *tn = net_generic(net, tipc_net_id);
2668 struct tipc_node *node;
2669 struct tipc_nl_msg msg;
2670 u32 prev_node = cb->args[0];
2671 u32 prev_link = cb->args[1];
2672 int done = cb->args[2];
2673 bool bc_link = cb->args[3];
2674 int err;
2675
2676 if (done)
2677 return 0;
2678
2679 if (!prev_node) {
2680 /* Check if broadcast-receiver links dumping is needed */
2681 if (attrs && attrs[TIPC_NLA_LINK]) {
2682 err = nla_parse_nested_deprecated(link,
2683 TIPC_NLA_LINK_MAX,
2684 attrs[TIPC_NLA_LINK],
2685 tipc_nl_link_policy,
2686 NULL);
2687 if (unlikely(err))
2688 return err;
2689 if (unlikely(!link[TIPC_NLA_LINK_BROADCAST]))
2690 return -EINVAL;
2691 bc_link = true;
2692 }
2693 }
2694
2695 msg.skb = skb;
2696 msg.portid = NETLINK_CB(cb->skb).portid;
2697 msg.seq = cb->nlh->nlmsg_seq;
2698
2699 rcu_read_lock();
2700 if (prev_node) {
2701 node = tipc_node_find(net, prev_node);
2702 if (!node) {
2703 /* We never set seq or call nl_dump_check_consistent()
2704 * this means that setting prev_seq here will cause the
2705 * consistence check to fail in the netlink callback
2706 * handler. Resulting in the last NLMSG_DONE message
2707 * having the NLM_F_DUMP_INTR flag set.
2708 */
2709 cb->prev_seq = 1;
2710 goto out;
2711 }
2712 tipc_node_put(node);
2713
2714 list_for_each_entry_continue_rcu(node, &tn->node_list,
2715 list) {
2716 tipc_node_read_lock(node);
2717 err = __tipc_nl_add_node_links(net, &msg, node,
2718 &prev_link, bc_link);
2719 tipc_node_read_unlock(node);
2720 if (err)
2721 goto out;
2722
2723 prev_node = node->addr;
2724 }
2725 } else {
2726 err = tipc_nl_add_bc_link(net, &msg, tn->bcl);
2727 if (err)
2728 goto out;
2729
2730 list_for_each_entry_rcu(node, &tn->node_list, list) {
2731 tipc_node_read_lock(node);
2732 err = __tipc_nl_add_node_links(net, &msg, node,
2733 &prev_link, bc_link);
2734 tipc_node_read_unlock(node);
2735 if (err)
2736 goto out;
2737
2738 prev_node = node->addr;
2739 }
2740 }
2741 done = 1;
2742out:
2743 rcu_read_unlock();
2744
2745 cb->args[0] = prev_node;
2746 cb->args[1] = prev_link;
2747 cb->args[2] = done;
2748 cb->args[3] = bc_link;
2749
2750 return skb->len;
2751}
2752
2753int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2754{
2755 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2756 struct net *net = sock_net(skb->sk);
2757 int err;
2758
2759 if (!info->attrs[TIPC_NLA_MON])
2760 return -EINVAL;
2761
2762 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
2763 info->attrs[TIPC_NLA_MON],
2764 tipc_nl_monitor_policy,
2765 info->extack);
2766 if (err)
2767 return err;
2768
2769 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2770 u32 val;
2771
2772 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2773 err = tipc_nl_monitor_set_threshold(net, val);
2774 if (err)
2775 return err;
2776 }
2777
2778 return 0;
2779}
2780
2781static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2782{
2783 struct nlattr *attrs;
2784 void *hdr;
2785 u32 val;
2786
2787 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2788 0, TIPC_NL_MON_GET);
2789 if (!hdr)
2790 return -EMSGSIZE;
2791
2792 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
2793 if (!attrs)
2794 goto msg_full;
2795
2796 val = tipc_nl_monitor_get_threshold(net);
2797
2798 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2799 goto attr_msg_full;
2800
2801 nla_nest_end(msg->skb, attrs);
2802 genlmsg_end(msg->skb, hdr);
2803
2804 return 0;
2805
2806attr_msg_full:
2807 nla_nest_cancel(msg->skb, attrs);
2808msg_full:
2809 genlmsg_cancel(msg->skb, hdr);
2810
2811 return -EMSGSIZE;
2812}
2813
2814int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2815{
2816 struct net *net = sock_net(skb->sk);
2817 struct tipc_nl_msg msg;
2818 int err;
2819
2820 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2821 if (!msg.skb)
2822 return -ENOMEM;
2823 msg.portid = info->snd_portid;
2824 msg.seq = info->snd_seq;
2825
2826 err = __tipc_nl_add_monitor_prop(net, &msg);
2827 if (err) {
2828 nlmsg_free(msg.skb);
2829 return err;
2830 }
2831
2832 return genlmsg_reply(msg.skb, info);
2833}
2834
2835int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2836{
2837 struct net *net = sock_net(skb->sk);
2838 u32 prev_bearer = cb->args[0];
2839 struct tipc_nl_msg msg;
2840 int bearer_id;
2841 int err;
2842
2843 if (prev_bearer == MAX_BEARERS)
2844 return 0;
2845
2846 msg.skb = skb;
2847 msg.portid = NETLINK_CB(cb->skb).portid;
2848 msg.seq = cb->nlh->nlmsg_seq;
2849
2850 rtnl_lock();
2851 for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2852 err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2853 if (err)
2854 break;
2855 }
2856 rtnl_unlock();
2857 cb->args[0] = bearer_id;
2858
2859 return skb->len;
2860}
2861
2862int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2863 struct netlink_callback *cb)
2864{
2865 struct net *net = sock_net(skb->sk);
2866 u32 prev_node = cb->args[1];
2867 u32 bearer_id = cb->args[2];
2868 int done = cb->args[0];
2869 struct tipc_nl_msg msg;
2870 int err;
2871
2872 if (!prev_node) {
2873 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
2874 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2875
2876 if (!attrs[TIPC_NLA_MON])
2877 return -EINVAL;
2878
2879 err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
2880 attrs[TIPC_NLA_MON],
2881 tipc_nl_monitor_policy,
2882 NULL);
2883 if (err)
2884 return err;
2885
2886 if (!mon[TIPC_NLA_MON_REF])
2887 return -EINVAL;
2888
2889 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2890
2891 if (bearer_id >= MAX_BEARERS)
2892 return -EINVAL;
2893 }
2894
2895 if (done)
2896 return 0;
2897
2898 msg.skb = skb;
2899 msg.portid = NETLINK_CB(cb->skb).portid;
2900 msg.seq = cb->nlh->nlmsg_seq;
2901
2902 rtnl_lock();
2903 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2904 if (!err)
2905 done = 1;
2906
2907 rtnl_unlock();
2908 cb->args[0] = done;
2909 cb->args[1] = prev_node;
2910 cb->args[2] = bearer_id;
2911
2912 return skb->len;
2913}
2914
2915#ifdef CONFIG_TIPC_CRYPTO
2916static int tipc_nl_retrieve_key(struct nlattr **attrs,
2917 struct tipc_aead_key **pkey)
2918{
2919 struct nlattr *attr = attrs[TIPC_NLA_NODE_KEY];
2920 struct tipc_aead_key *key;
2921
2922 if (!attr)
2923 return -ENODATA;
2924
2925 if (nla_len(attr) < sizeof(*key))
2926 return -EINVAL;
2927 key = (struct tipc_aead_key *)nla_data(attr);
2928 if (key->keylen > TIPC_AEAD_KEYLEN_MAX ||
2929 nla_len(attr) < tipc_aead_key_size(key))
2930 return -EINVAL;
2931
2932 *pkey = key;
2933 return 0;
2934}
2935
2936static int tipc_nl_retrieve_nodeid(struct nlattr **attrs, u8 **node_id)
2937{
2938 struct nlattr *attr = attrs[TIPC_NLA_NODE_ID];
2939
2940 if (!attr)
2941 return -ENODATA;
2942
2943 if (nla_len(attr) < TIPC_NODEID_LEN)
2944 return -EINVAL;
2945
2946 *node_id = (u8 *)nla_data(attr);
2947 return 0;
2948}
2949
2950static int tipc_nl_retrieve_rekeying(struct nlattr **attrs, u32 *intv)
2951{
2952 struct nlattr *attr = attrs[TIPC_NLA_NODE_REKEYING];
2953
2954 if (!attr)
2955 return -ENODATA;
2956
2957 *intv = nla_get_u32(attr);
2958 return 0;
2959}
2960
2961static int __tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
2962{
2963 struct nlattr *attrs[TIPC_NLA_NODE_MAX + 1];
2964 struct net *net = sock_net(skb->sk);
2965 struct tipc_crypto *tx = tipc_net(net)->crypto_tx, *c = tx;
2966 struct tipc_node *n = NULL;
2967 struct tipc_aead_key *ukey;
2968 bool rekeying = true, master_key = false;
2969 u8 *id, *own_id, mode;
2970 u32 intv = 0;
2971 int rc = 0;
2972
2973 if (!info->attrs[TIPC_NLA_NODE])
2974 return -EINVAL;
2975
2976 rc = nla_parse_nested(attrs, TIPC_NLA_NODE_MAX,
2977 info->attrs[TIPC_NLA_NODE],
2978 tipc_nl_node_policy, info->extack);
2979 if (rc)
2980 return rc;
2981
2982 own_id = tipc_own_id(net);
2983 if (!own_id) {
2984 GENL_SET_ERR_MSG(info, "not found own node identity (set id?)");
2985 return -EPERM;
2986 }
2987
2988 rc = tipc_nl_retrieve_rekeying(attrs, &intv);
2989 if (rc == -ENODATA)
2990 rekeying = false;
2991
2992 rc = tipc_nl_retrieve_key(attrs, &ukey);
2993 if (rc == -ENODATA && rekeying)
2994 goto rekeying;
2995 else if (rc)
2996 return rc;
2997
2998 rc = tipc_aead_key_validate(ukey, info);
2999 if (rc)
3000 return rc;
3001
3002 rc = tipc_nl_retrieve_nodeid(attrs, &id);
3003 switch (rc) {
3004 case -ENODATA:
3005 mode = CLUSTER_KEY;
3006 master_key = !!(attrs[TIPC_NLA_NODE_KEY_MASTER]);
3007 break;
3008 case 0:
3009 mode = PER_NODE_KEY;
3010 if (memcmp(id, own_id, NODE_ID_LEN)) {
3011 n = tipc_node_find_by_id(net, id) ?:
3012 tipc_node_create(net, 0, id, 0xffffu, 0, true);
3013 if (unlikely(!n))
3014 return -ENOMEM;
3015 c = n->crypto_rx;
3016 }
3017 break;
3018 default:
3019 return rc;
3020 }
3021
3022 /* Initiate the TX/RX key */
3023 rc = tipc_crypto_key_init(c, ukey, mode, master_key);
3024 if (n)
3025 tipc_node_put(n);
3026
3027 if (unlikely(rc < 0)) {
3028 GENL_SET_ERR_MSG(info, "unable to initiate or attach new key");
3029 return rc;
3030 } else if (c == tx) {
3031 /* Distribute TX key but not master one */
3032 if (!master_key && tipc_crypto_key_distr(tx, rc, NULL))
3033 GENL_SET_ERR_MSG(info, "failed to replicate new key");
3034rekeying:
3035 /* Schedule TX rekeying if needed */
3036 tipc_crypto_rekeying_sched(tx, rekeying, intv);
3037 }
3038
3039 return 0;
3040}
3041
3042int tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
3043{
3044 int err;
3045
3046 rtnl_lock();
3047 err = __tipc_nl_node_set_key(skb, info);
3048 rtnl_unlock();
3049
3050 return err;
3051}
3052
3053static int __tipc_nl_node_flush_key(struct sk_buff *skb,
3054 struct genl_info *info)
3055{
3056 struct net *net = sock_net(skb->sk);
3057 struct tipc_net *tn = tipc_net(net);
3058 struct tipc_node *n;
3059
3060 tipc_crypto_key_flush(tn->crypto_tx);
3061 rcu_read_lock();
3062 list_for_each_entry_rcu(n, &tn->node_list, list)
3063 tipc_crypto_key_flush(n->crypto_rx);
3064 rcu_read_unlock();
3065
3066 return 0;
3067}
3068
3069int tipc_nl_node_flush_key(struct sk_buff *skb, struct genl_info *info)
3070{
3071 int err;
3072
3073 rtnl_lock();
3074 err = __tipc_nl_node_flush_key(skb, info);
3075 rtnl_unlock();
3076
3077 return err;
3078}
3079#endif
3080
3081/**
3082 * tipc_node_dump - dump TIPC node data
3083 * @n: tipc node to be dumped
3084 * @more: dump more?
3085 * - false: dump only tipc node data
3086 * - true: dump node link data as well
3087 * @buf: returned buffer of dump data in format
3088 */
3089int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
3090{
3091 int i = 0;
3092 size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
3093
3094 if (!n) {
3095 i += scnprintf(buf, sz, "node data: (null)\n");
3096 return i;
3097 }
3098
3099 i += scnprintf(buf, sz, "node data: %x", n->addr);
3100 i += scnprintf(buf + i, sz - i, " %x", n->state);
3101 i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
3102 i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
3103 i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
3104 i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
3105 i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
3106 i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
3107 i += scnprintf(buf + i, sz - i, " %u", n->working_links);
3108 i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
3109 i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
3110
3111 if (!more)
3112 return i;
3113
3114 i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
3115 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
3116 i += scnprintf(buf + i, sz - i, " media: ");
3117 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
3118 i += scnprintf(buf + i, sz - i, "\n");
3119 i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
3120 i += scnprintf(buf + i, sz - i, " inputq: ");
3121 i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
3122
3123 i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
3124 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
3125 i += scnprintf(buf + i, sz - i, " media: ");
3126 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
3127 i += scnprintf(buf + i, sz - i, "\n");
3128 i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
3129 i += scnprintf(buf + i, sz - i, " inputq: ");
3130 i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
3131
3132 i += scnprintf(buf + i, sz - i, "bclink:\n ");
3133 i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
3134
3135 return i;
3136}
3137
3138void tipc_node_pre_cleanup_net(struct net *exit_net)
3139{
3140 struct tipc_node *n;
3141 struct tipc_net *tn;
3142 struct net *tmp;
3143
3144 rcu_read_lock();
3145 for_each_net_rcu(tmp) {
3146 if (tmp == exit_net)
3147 continue;
3148 tn = tipc_net(tmp);
3149 if (!tn)
3150 continue;
3151 spin_lock_bh(&tn->node_list_lock);
3152 list_for_each_entry_rcu(n, &tn->node_list, list) {
3153 if (!n->peer_net)
3154 continue;
3155 if (n->peer_net != exit_net)
3156 continue;
3157 tipc_node_write_lock(n);
3158 n->peer_net = NULL;
3159 n->peer_hash_mix = 0;
3160 tipc_node_write_unlock_fast(n);
3161 break;
3162 }
3163 spin_unlock_bh(&tn->node_list_lock);
3164 }
3165 rcu_read_unlock();
3166}
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 u8 peer_id[16];
119 struct list_head publ_list;
120 struct list_head conn_sks;
121 unsigned long keepalive_intv;
122 struct timer_list timer;
123 struct rcu_head rcu;
124};
125
126/* Node FSM states and events:
127 */
128enum {
129 SELF_DOWN_PEER_DOWN = 0xdd,
130 SELF_UP_PEER_UP = 0xaa,
131 SELF_DOWN_PEER_LEAVING = 0xd1,
132 SELF_UP_PEER_COMING = 0xac,
133 SELF_COMING_PEER_UP = 0xca,
134 SELF_LEAVING_PEER_DOWN = 0x1d,
135 NODE_FAILINGOVER = 0xf0,
136 NODE_SYNCHING = 0xcc
137};
138
139enum {
140 SELF_ESTABL_CONTACT_EVT = 0xece,
141 SELF_LOST_CONTACT_EVT = 0x1ce,
142 PEER_ESTABL_CONTACT_EVT = 0x9ece,
143 PEER_LOST_CONTACT_EVT = 0x91ce,
144 NODE_FAILOVER_BEGIN_EVT = 0xfbe,
145 NODE_FAILOVER_END_EVT = 0xfee,
146 NODE_SYNCH_BEGIN_EVT = 0xcbe,
147 NODE_SYNCH_END_EVT = 0xcee
148};
149
150static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
151 struct sk_buff_head *xmitq,
152 struct tipc_media_addr **maddr);
153static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
154 bool delete);
155static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
156static void tipc_node_delete(struct tipc_node *node);
157static void tipc_node_timeout(struct timer_list *t);
158static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
159static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
160static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
161static void tipc_node_put(struct tipc_node *node);
162static bool node_is_up(struct tipc_node *n);
163
164struct tipc_sock_conn {
165 u32 port;
166 u32 peer_port;
167 u32 peer_node;
168 struct list_head list;
169};
170
171static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
172{
173 int bearer_id = n->active_links[sel & 1];
174
175 if (unlikely(bearer_id == INVALID_BEARER_ID))
176 return NULL;
177
178 return n->links[bearer_id].link;
179}
180
181int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel)
182{
183 struct tipc_node *n;
184 int bearer_id;
185 unsigned int mtu = MAX_MSG_SIZE;
186
187 n = tipc_node_find(net, addr);
188 if (unlikely(!n))
189 return mtu;
190
191 bearer_id = n->active_links[sel & 1];
192 if (likely(bearer_id != INVALID_BEARER_ID))
193 mtu = n->links[bearer_id].mtu;
194 tipc_node_put(n);
195 return mtu;
196}
197
198u16 tipc_node_get_capabilities(struct net *net, u32 addr)
199{
200 struct tipc_node *n;
201 u16 caps;
202
203 n = tipc_node_find(net, addr);
204 if (unlikely(!n))
205 return TIPC_NODE_CAPABILITIES;
206 caps = n->capabilities;
207 tipc_node_put(n);
208 return caps;
209}
210
211static void tipc_node_kref_release(struct kref *kref)
212{
213 struct tipc_node *n = container_of(kref, struct tipc_node, kref);
214
215 kfree(n->bc_entry.link);
216 kfree_rcu(n, rcu);
217}
218
219static void tipc_node_put(struct tipc_node *node)
220{
221 kref_put(&node->kref, tipc_node_kref_release);
222}
223
224static void tipc_node_get(struct tipc_node *node)
225{
226 kref_get(&node->kref);
227}
228
229/*
230 * tipc_node_find - locate specified node object, if it exists
231 */
232static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
233{
234 struct tipc_net *tn = tipc_net(net);
235 struct tipc_node *node;
236 unsigned int thash = tipc_hashfn(addr);
237
238 rcu_read_lock();
239 hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
240 if (node->addr != addr)
241 continue;
242 if (!kref_get_unless_zero(&node->kref))
243 node = NULL;
244 break;
245 }
246 rcu_read_unlock();
247 return node;
248}
249
250/* tipc_node_find_by_id - locate specified node object by its 128-bit id
251 * Note: this function is called only when a discovery request failed
252 * to find the node by its 32-bit id, and is not time critical
253 */
254static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id)
255{
256 struct tipc_net *tn = tipc_net(net);
257 struct tipc_node *n;
258 bool found = false;
259
260 rcu_read_lock();
261 list_for_each_entry_rcu(n, &tn->node_list, list) {
262 read_lock_bh(&n->lock);
263 if (!memcmp(id, n->peer_id, 16) &&
264 kref_get_unless_zero(&n->kref))
265 found = true;
266 read_unlock_bh(&n->lock);
267 if (found)
268 break;
269 }
270 rcu_read_unlock();
271 return found ? n : NULL;
272}
273
274static void tipc_node_read_lock(struct tipc_node *n)
275{
276 read_lock_bh(&n->lock);
277}
278
279static void tipc_node_read_unlock(struct tipc_node *n)
280{
281 read_unlock_bh(&n->lock);
282}
283
284static void tipc_node_write_lock(struct tipc_node *n)
285{
286 write_lock_bh(&n->lock);
287}
288
289static void tipc_node_write_unlock_fast(struct tipc_node *n)
290{
291 write_unlock_bh(&n->lock);
292}
293
294static void tipc_node_write_unlock(struct tipc_node *n)
295{
296 struct net *net = n->net;
297 u32 addr = 0;
298 u32 flags = n->action_flags;
299 u32 link_id = 0;
300 u32 bearer_id;
301 struct list_head *publ_list;
302
303 if (likely(!flags)) {
304 write_unlock_bh(&n->lock);
305 return;
306 }
307
308 addr = n->addr;
309 link_id = n->link_id;
310 bearer_id = link_id & 0xffff;
311 publ_list = &n->publ_list;
312
313 n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
314 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
315
316 write_unlock_bh(&n->lock);
317
318 if (flags & TIPC_NOTIFY_NODE_DOWN)
319 tipc_publ_notify(net, publ_list, addr);
320
321 if (flags & TIPC_NOTIFY_NODE_UP)
322 tipc_named_node_up(net, addr);
323
324 if (flags & TIPC_NOTIFY_LINK_UP) {
325 tipc_mon_peer_up(net, addr, bearer_id);
326 tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
327 TIPC_NODE_SCOPE, link_id, link_id);
328 }
329 if (flags & TIPC_NOTIFY_LINK_DOWN) {
330 tipc_mon_peer_down(net, addr, bearer_id);
331 tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
332 addr, link_id);
333 }
334}
335
336static struct tipc_node *tipc_node_create(struct net *net, u32 addr,
337 u8 *peer_id, u16 capabilities)
338{
339 struct tipc_net *tn = net_generic(net, tipc_net_id);
340 struct tipc_node *n, *temp_node;
341 int i;
342
343 spin_lock_bh(&tn->node_list_lock);
344 n = tipc_node_find(net, addr);
345 if (n) {
346 /* Same node may come back with new capabilities */
347 n->capabilities = capabilities;
348 goto exit;
349 }
350 n = kzalloc(sizeof(*n), GFP_ATOMIC);
351 if (!n) {
352 pr_warn("Node creation failed, no memory\n");
353 goto exit;
354 }
355 n->addr = addr;
356 memcpy(&n->peer_id, peer_id, 16);
357 n->net = net;
358 n->capabilities = capabilities;
359 kref_init(&n->kref);
360 rwlock_init(&n->lock);
361 INIT_HLIST_NODE(&n->hash);
362 INIT_LIST_HEAD(&n->list);
363 INIT_LIST_HEAD(&n->publ_list);
364 INIT_LIST_HEAD(&n->conn_sks);
365 skb_queue_head_init(&n->bc_entry.namedq);
366 skb_queue_head_init(&n->bc_entry.inputq1);
367 __skb_queue_head_init(&n->bc_entry.arrvq);
368 skb_queue_head_init(&n->bc_entry.inputq2);
369 for (i = 0; i < MAX_BEARERS; i++)
370 spin_lock_init(&n->links[i].lock);
371 n->state = SELF_DOWN_PEER_LEAVING;
372 n->signature = INVALID_NODE_SIG;
373 n->active_links[0] = INVALID_BEARER_ID;
374 n->active_links[1] = INVALID_BEARER_ID;
375 if (!tipc_link_bc_create(net, tipc_own_addr(net),
376 addr, U16_MAX,
377 tipc_link_window(tipc_bc_sndlink(net)),
378 n->capabilities,
379 &n->bc_entry.inputq1,
380 &n->bc_entry.namedq,
381 tipc_bc_sndlink(net),
382 &n->bc_entry.link)) {
383 pr_warn("Broadcast rcv link creation failed, no memory\n");
384 kfree(n);
385 n = NULL;
386 goto exit;
387 }
388 tipc_node_get(n);
389 timer_setup(&n->timer, tipc_node_timeout, 0);
390 n->keepalive_intv = U32_MAX;
391 hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
392 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
393 if (n->addr < temp_node->addr)
394 break;
395 }
396 list_add_tail_rcu(&n->list, &temp_node->list);
397exit:
398 spin_unlock_bh(&tn->node_list_lock);
399 return n;
400}
401
402static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
403{
404 unsigned long tol = tipc_link_tolerance(l);
405 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
406
407 /* Link with lowest tolerance determines timer interval */
408 if (intv < n->keepalive_intv)
409 n->keepalive_intv = intv;
410
411 /* Ensure link's abort limit corresponds to current tolerance */
412 tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
413}
414
415static void tipc_node_delete(struct tipc_node *node)
416{
417 list_del_rcu(&node->list);
418 hlist_del_rcu(&node->hash);
419 tipc_node_put(node);
420
421 del_timer_sync(&node->timer);
422 tipc_node_put(node);
423}
424
425void tipc_node_stop(struct net *net)
426{
427 struct tipc_net *tn = tipc_net(net);
428 struct tipc_node *node, *t_node;
429
430 spin_lock_bh(&tn->node_list_lock);
431 list_for_each_entry_safe(node, t_node, &tn->node_list, list)
432 tipc_node_delete(node);
433 spin_unlock_bh(&tn->node_list_lock);
434}
435
436void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
437{
438 struct tipc_node *n;
439
440 if (in_own_node(net, addr))
441 return;
442
443 n = tipc_node_find(net, addr);
444 if (!n) {
445 pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
446 return;
447 }
448 tipc_node_write_lock(n);
449 list_add_tail(subscr, &n->publ_list);
450 tipc_node_write_unlock_fast(n);
451 tipc_node_put(n);
452}
453
454void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
455{
456 struct tipc_node *n;
457
458 if (in_own_node(net, addr))
459 return;
460
461 n = tipc_node_find(net, addr);
462 if (!n) {
463 pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
464 return;
465 }
466 tipc_node_write_lock(n);
467 list_del_init(subscr);
468 tipc_node_write_unlock_fast(n);
469 tipc_node_put(n);
470}
471
472int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
473{
474 struct tipc_node *node;
475 struct tipc_sock_conn *conn;
476 int err = 0;
477
478 if (in_own_node(net, dnode))
479 return 0;
480
481 node = tipc_node_find(net, dnode);
482 if (!node) {
483 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
484 return -EHOSTUNREACH;
485 }
486 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
487 if (!conn) {
488 err = -EHOSTUNREACH;
489 goto exit;
490 }
491 conn->peer_node = dnode;
492 conn->port = port;
493 conn->peer_port = peer_port;
494
495 tipc_node_write_lock(node);
496 list_add_tail(&conn->list, &node->conn_sks);
497 tipc_node_write_unlock(node);
498exit:
499 tipc_node_put(node);
500 return err;
501}
502
503void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
504{
505 struct tipc_node *node;
506 struct tipc_sock_conn *conn, *safe;
507
508 if (in_own_node(net, dnode))
509 return;
510
511 node = tipc_node_find(net, dnode);
512 if (!node)
513 return;
514
515 tipc_node_write_lock(node);
516 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
517 if (port != conn->port)
518 continue;
519 list_del(&conn->list);
520 kfree(conn);
521 }
522 tipc_node_write_unlock(node);
523 tipc_node_put(node);
524}
525
526/* tipc_node_timeout - handle expiration of node timer
527 */
528static void tipc_node_timeout(struct timer_list *t)
529{
530 struct tipc_node *n = from_timer(n, t, timer);
531 struct tipc_link_entry *le;
532 struct sk_buff_head xmitq;
533 int bearer_id;
534 int rc = 0;
535
536 __skb_queue_head_init(&xmitq);
537
538 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
539 tipc_node_read_lock(n);
540 le = &n->links[bearer_id];
541 spin_lock_bh(&le->lock);
542 if (le->link) {
543 /* Link tolerance may change asynchronously: */
544 tipc_node_calculate_timer(n, le->link);
545 rc = tipc_link_timeout(le->link, &xmitq);
546 }
547 spin_unlock_bh(&le->lock);
548 tipc_node_read_unlock(n);
549 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
550 if (rc & TIPC_LINK_DOWN_EVT)
551 tipc_node_link_down(n, bearer_id, false);
552 }
553 mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
554}
555
556/**
557 * __tipc_node_link_up - handle addition of link
558 * Node lock must be held by caller
559 * Link becomes active (alone or shared) or standby, depending on its priority.
560 */
561static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
562 struct sk_buff_head *xmitq)
563{
564 int *slot0 = &n->active_links[0];
565 int *slot1 = &n->active_links[1];
566 struct tipc_link *ol = node_active_link(n, 0);
567 struct tipc_link *nl = n->links[bearer_id].link;
568
569 if (!nl || tipc_link_is_up(nl))
570 return;
571
572 tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
573 if (!tipc_link_is_up(nl))
574 return;
575
576 n->working_links++;
577 n->action_flags |= TIPC_NOTIFY_LINK_UP;
578 n->link_id = tipc_link_id(nl);
579
580 /* Leave room for tunnel header when returning 'mtu' to users: */
581 n->links[bearer_id].mtu = tipc_link_mtu(nl) - INT_H_SIZE;
582
583 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
584 tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
585
586 pr_debug("Established link <%s> on network plane %c\n",
587 tipc_link_name(nl), tipc_link_plane(nl));
588
589 /* Ensure that a STATE message goes first */
590 tipc_link_build_state_msg(nl, xmitq);
591
592 /* First link? => give it both slots */
593 if (!ol) {
594 *slot0 = bearer_id;
595 *slot1 = bearer_id;
596 tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
597 n->action_flags |= TIPC_NOTIFY_NODE_UP;
598 tipc_link_set_active(nl, true);
599 tipc_bcast_add_peer(n->net, nl, xmitq);
600 return;
601 }
602
603 /* Second link => redistribute slots */
604 if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
605 pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
606 *slot0 = bearer_id;
607 *slot1 = bearer_id;
608 tipc_link_set_active(nl, true);
609 tipc_link_set_active(ol, false);
610 } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
611 tipc_link_set_active(nl, true);
612 *slot1 = bearer_id;
613 } else {
614 pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
615 }
616
617 /* Prepare synchronization with first link */
618 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
619}
620
621/**
622 * tipc_node_link_up - handle addition of link
623 *
624 * Link becomes active (alone or shared) or standby, depending on its priority.
625 */
626static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
627 struct sk_buff_head *xmitq)
628{
629 struct tipc_media_addr *maddr;
630
631 tipc_node_write_lock(n);
632 __tipc_node_link_up(n, bearer_id, xmitq);
633 maddr = &n->links[bearer_id].maddr;
634 tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr);
635 tipc_node_write_unlock(n);
636}
637
638/**
639 * __tipc_node_link_down - handle loss of link
640 */
641static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
642 struct sk_buff_head *xmitq,
643 struct tipc_media_addr **maddr)
644{
645 struct tipc_link_entry *le = &n->links[*bearer_id];
646 int *slot0 = &n->active_links[0];
647 int *slot1 = &n->active_links[1];
648 int i, highest = 0, prio;
649 struct tipc_link *l, *_l, *tnl;
650
651 l = n->links[*bearer_id].link;
652 if (!l || tipc_link_is_reset(l))
653 return;
654
655 n->working_links--;
656 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
657 n->link_id = tipc_link_id(l);
658
659 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
660
661 pr_debug("Lost link <%s> on network plane %c\n",
662 tipc_link_name(l), tipc_link_plane(l));
663
664 /* Select new active link if any available */
665 *slot0 = INVALID_BEARER_ID;
666 *slot1 = INVALID_BEARER_ID;
667 for (i = 0; i < MAX_BEARERS; i++) {
668 _l = n->links[i].link;
669 if (!_l || !tipc_link_is_up(_l))
670 continue;
671 if (_l == l)
672 continue;
673 prio = tipc_link_prio(_l);
674 if (prio < highest)
675 continue;
676 if (prio > highest) {
677 highest = prio;
678 *slot0 = i;
679 *slot1 = i;
680 continue;
681 }
682 *slot1 = i;
683 }
684
685 if (!node_is_up(n)) {
686 if (tipc_link_peer_is_down(l))
687 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
688 tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
689 tipc_link_fsm_evt(l, LINK_RESET_EVT);
690 tipc_link_reset(l);
691 tipc_link_build_reset_msg(l, xmitq);
692 *maddr = &n->links[*bearer_id].maddr;
693 node_lost_contact(n, &le->inputq);
694 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
695 return;
696 }
697 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
698
699 /* There is still a working link => initiate failover */
700 *bearer_id = n->active_links[0];
701 tnl = n->links[*bearer_id].link;
702 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
703 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
704 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
705 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
706 tipc_link_reset(l);
707 tipc_link_fsm_evt(l, LINK_RESET_EVT);
708 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
709 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
710 *maddr = &n->links[*bearer_id].maddr;
711}
712
713static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
714{
715 struct tipc_link_entry *le = &n->links[bearer_id];
716 struct tipc_link *l = le->link;
717 struct tipc_media_addr *maddr;
718 struct sk_buff_head xmitq;
719 int old_bearer_id = bearer_id;
720
721 if (!l)
722 return;
723
724 __skb_queue_head_init(&xmitq);
725
726 tipc_node_write_lock(n);
727 if (!tipc_link_is_establishing(l)) {
728 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
729 if (delete) {
730 kfree(l);
731 le->link = NULL;
732 n->link_cnt--;
733 }
734 } else {
735 /* Defuse pending tipc_node_link_up() */
736 tipc_link_fsm_evt(l, LINK_RESET_EVT);
737 }
738 tipc_node_write_unlock(n);
739 if (delete)
740 tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
741 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
742 tipc_sk_rcv(n->net, &le->inputq);
743}
744
745static bool node_is_up(struct tipc_node *n)
746{
747 return n->active_links[0] != INVALID_BEARER_ID;
748}
749
750bool tipc_node_is_up(struct net *net, u32 addr)
751{
752 struct tipc_node *n;
753 bool retval = false;
754
755 if (in_own_node(net, addr))
756 return true;
757
758 n = tipc_node_find(net, addr);
759 if (!n)
760 return false;
761 retval = node_is_up(n);
762 tipc_node_put(n);
763 return retval;
764}
765
766static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
767{
768 struct tipc_node *n;
769
770 addr ^= tipc_net(net)->random;
771 while ((n = tipc_node_find(net, addr))) {
772 tipc_node_put(n);
773 addr++;
774 }
775 return addr;
776}
777
778/* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
779 */
780u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
781{
782 struct tipc_net *tn = tipc_net(net);
783 struct tipc_node *n;
784
785 /* Suggest new address if some other peer is using this one */
786 n = tipc_node_find(net, addr);
787 if (n) {
788 if (!memcmp(n->peer_id, id, NODE_ID_LEN))
789 addr = 0;
790 tipc_node_put(n);
791 if (!addr)
792 return 0;
793 return tipc_node_suggest_addr(net, addr);
794 }
795
796 /* Suggest previously used address if peer is known */
797 n = tipc_node_find_by_id(net, id);
798 if (n) {
799 addr = n->addr;
800 tipc_node_put(n);
801 }
802 /* Even this node may be in trial phase */
803 if (tn->trial_addr == addr)
804 return tipc_node_suggest_addr(net, addr);
805
806 return addr;
807}
808
809void tipc_node_check_dest(struct net *net, u32 addr,
810 u8 *peer_id, struct tipc_bearer *b,
811 u16 capabilities, u32 signature,
812 struct tipc_media_addr *maddr,
813 bool *respond, bool *dupl_addr)
814{
815 struct tipc_node *n;
816 struct tipc_link *l;
817 struct tipc_link_entry *le;
818 bool addr_match = false;
819 bool sign_match = false;
820 bool link_up = false;
821 bool accept_addr = false;
822 bool reset = true;
823 char *if_name;
824 unsigned long intv;
825
826 *dupl_addr = false;
827 *respond = false;
828
829 n = tipc_node_create(net, addr, peer_id, capabilities);
830 if (!n)
831 return;
832
833 tipc_node_write_lock(n);
834
835 le = &n->links[b->identity];
836
837 /* Prepare to validate requesting node's signature and media address */
838 l = le->link;
839 link_up = l && tipc_link_is_up(l);
840 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
841 sign_match = (signature == n->signature);
842
843 /* These three flags give us eight permutations: */
844
845 if (sign_match && addr_match && link_up) {
846 /* All is fine. Do nothing. */
847 reset = false;
848 } else if (sign_match && addr_match && !link_up) {
849 /* Respond. The link will come up in due time */
850 *respond = true;
851 } else if (sign_match && !addr_match && link_up) {
852 /* Peer has changed i/f address without rebooting.
853 * If so, the link will reset soon, and the next
854 * discovery will be accepted. So we can ignore it.
855 * It may also be an cloned or malicious peer having
856 * chosen the same node address and signature as an
857 * existing one.
858 * Ignore requests until the link goes down, if ever.
859 */
860 *dupl_addr = true;
861 } else if (sign_match && !addr_match && !link_up) {
862 /* Peer link has changed i/f address without rebooting.
863 * It may also be a cloned or malicious peer; we can't
864 * distinguish between the two.
865 * The signature is correct, so we must accept.
866 */
867 accept_addr = true;
868 *respond = true;
869 } else if (!sign_match && addr_match && link_up) {
870 /* Peer node rebooted. Two possibilities:
871 * - Delayed re-discovery; this link endpoint has already
872 * reset and re-established contact with the peer, before
873 * receiving a discovery message from that node.
874 * (The peer happened to receive one from this node first).
875 * - The peer came back so fast that our side has not
876 * discovered it yet. Probing from this side will soon
877 * reset the link, since there can be no working link
878 * endpoint at the peer end, and the link will re-establish.
879 * Accept the signature, since it comes from a known peer.
880 */
881 n->signature = signature;
882 } else if (!sign_match && addr_match && !link_up) {
883 /* The peer node has rebooted.
884 * Accept signature, since it is a known peer.
885 */
886 n->signature = signature;
887 *respond = true;
888 } else if (!sign_match && !addr_match && link_up) {
889 /* Peer rebooted with new address, or a new/duplicate peer.
890 * Ignore until the link goes down, if ever.
891 */
892 *dupl_addr = true;
893 } else if (!sign_match && !addr_match && !link_up) {
894 /* Peer rebooted with new address, or it is a new peer.
895 * Accept signature and address.
896 */
897 n->signature = signature;
898 accept_addr = true;
899 *respond = true;
900 }
901
902 if (!accept_addr)
903 goto exit;
904
905 /* Now create new link if not already existing */
906 if (!l) {
907 if (n->link_cnt == 2)
908 goto exit;
909
910 if_name = strchr(b->name, ':') + 1;
911 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
912 b->net_plane, b->mtu, b->priority,
913 b->window, mod(tipc_net(net)->random),
914 tipc_own_addr(net), addr, peer_id,
915 n->capabilities,
916 tipc_bc_sndlink(n->net), n->bc_entry.link,
917 &le->inputq,
918 &n->bc_entry.namedq, &l)) {
919 *respond = false;
920 goto exit;
921 }
922 tipc_link_reset(l);
923 tipc_link_fsm_evt(l, LINK_RESET_EVT);
924 if (n->state == NODE_FAILINGOVER)
925 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
926 le->link = l;
927 n->link_cnt++;
928 tipc_node_calculate_timer(n, l);
929 if (n->link_cnt == 1) {
930 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
931 if (!mod_timer(&n->timer, intv))
932 tipc_node_get(n);
933 }
934 }
935 memcpy(&le->maddr, maddr, sizeof(*maddr));
936exit:
937 tipc_node_write_unlock(n);
938 if (reset && l && !tipc_link_is_reset(l))
939 tipc_node_link_down(n, b->identity, false);
940 tipc_node_put(n);
941}
942
943void tipc_node_delete_links(struct net *net, int bearer_id)
944{
945 struct tipc_net *tn = net_generic(net, tipc_net_id);
946 struct tipc_node *n;
947
948 rcu_read_lock();
949 list_for_each_entry_rcu(n, &tn->node_list, list) {
950 tipc_node_link_down(n, bearer_id, true);
951 }
952 rcu_read_unlock();
953}
954
955static void tipc_node_reset_links(struct tipc_node *n)
956{
957 int i;
958
959 pr_warn("Resetting all links to %x\n", n->addr);
960
961 for (i = 0; i < MAX_BEARERS; i++) {
962 tipc_node_link_down(n, i, false);
963 }
964}
965
966/* tipc_node_fsm_evt - node finite state machine
967 * Determines when contact is allowed with peer node
968 */
969static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
970{
971 int state = n->state;
972
973 switch (state) {
974 case SELF_DOWN_PEER_DOWN:
975 switch (evt) {
976 case SELF_ESTABL_CONTACT_EVT:
977 state = SELF_UP_PEER_COMING;
978 break;
979 case PEER_ESTABL_CONTACT_EVT:
980 state = SELF_COMING_PEER_UP;
981 break;
982 case SELF_LOST_CONTACT_EVT:
983 case PEER_LOST_CONTACT_EVT:
984 break;
985 case NODE_SYNCH_END_EVT:
986 case NODE_SYNCH_BEGIN_EVT:
987 case NODE_FAILOVER_BEGIN_EVT:
988 case NODE_FAILOVER_END_EVT:
989 default:
990 goto illegal_evt;
991 }
992 break;
993 case SELF_UP_PEER_UP:
994 switch (evt) {
995 case SELF_LOST_CONTACT_EVT:
996 state = SELF_DOWN_PEER_LEAVING;
997 break;
998 case PEER_LOST_CONTACT_EVT:
999 state = SELF_LEAVING_PEER_DOWN;
1000 break;
1001 case NODE_SYNCH_BEGIN_EVT:
1002 state = NODE_SYNCHING;
1003 break;
1004 case NODE_FAILOVER_BEGIN_EVT:
1005 state = NODE_FAILINGOVER;
1006 break;
1007 case SELF_ESTABL_CONTACT_EVT:
1008 case PEER_ESTABL_CONTACT_EVT:
1009 case NODE_SYNCH_END_EVT:
1010 case NODE_FAILOVER_END_EVT:
1011 break;
1012 default:
1013 goto illegal_evt;
1014 }
1015 break;
1016 case SELF_DOWN_PEER_LEAVING:
1017 switch (evt) {
1018 case PEER_LOST_CONTACT_EVT:
1019 state = SELF_DOWN_PEER_DOWN;
1020 break;
1021 case SELF_ESTABL_CONTACT_EVT:
1022 case PEER_ESTABL_CONTACT_EVT:
1023 case SELF_LOST_CONTACT_EVT:
1024 break;
1025 case NODE_SYNCH_END_EVT:
1026 case NODE_SYNCH_BEGIN_EVT:
1027 case NODE_FAILOVER_BEGIN_EVT:
1028 case NODE_FAILOVER_END_EVT:
1029 default:
1030 goto illegal_evt;
1031 }
1032 break;
1033 case SELF_UP_PEER_COMING:
1034 switch (evt) {
1035 case PEER_ESTABL_CONTACT_EVT:
1036 state = SELF_UP_PEER_UP;
1037 break;
1038 case SELF_LOST_CONTACT_EVT:
1039 state = SELF_DOWN_PEER_DOWN;
1040 break;
1041 case SELF_ESTABL_CONTACT_EVT:
1042 case PEER_LOST_CONTACT_EVT:
1043 case NODE_SYNCH_END_EVT:
1044 case NODE_FAILOVER_BEGIN_EVT:
1045 break;
1046 case NODE_SYNCH_BEGIN_EVT:
1047 case NODE_FAILOVER_END_EVT:
1048 default:
1049 goto illegal_evt;
1050 }
1051 break;
1052 case SELF_COMING_PEER_UP:
1053 switch (evt) {
1054 case SELF_ESTABL_CONTACT_EVT:
1055 state = SELF_UP_PEER_UP;
1056 break;
1057 case PEER_LOST_CONTACT_EVT:
1058 state = SELF_DOWN_PEER_DOWN;
1059 break;
1060 case SELF_LOST_CONTACT_EVT:
1061 case PEER_ESTABL_CONTACT_EVT:
1062 break;
1063 case NODE_SYNCH_END_EVT:
1064 case NODE_SYNCH_BEGIN_EVT:
1065 case NODE_FAILOVER_BEGIN_EVT:
1066 case NODE_FAILOVER_END_EVT:
1067 default:
1068 goto illegal_evt;
1069 }
1070 break;
1071 case SELF_LEAVING_PEER_DOWN:
1072 switch (evt) {
1073 case SELF_LOST_CONTACT_EVT:
1074 state = SELF_DOWN_PEER_DOWN;
1075 break;
1076 case SELF_ESTABL_CONTACT_EVT:
1077 case PEER_ESTABL_CONTACT_EVT:
1078 case PEER_LOST_CONTACT_EVT:
1079 break;
1080 case NODE_SYNCH_END_EVT:
1081 case NODE_SYNCH_BEGIN_EVT:
1082 case NODE_FAILOVER_BEGIN_EVT:
1083 case NODE_FAILOVER_END_EVT:
1084 default:
1085 goto illegal_evt;
1086 }
1087 break;
1088 case NODE_FAILINGOVER:
1089 switch (evt) {
1090 case SELF_LOST_CONTACT_EVT:
1091 state = SELF_DOWN_PEER_LEAVING;
1092 break;
1093 case PEER_LOST_CONTACT_EVT:
1094 state = SELF_LEAVING_PEER_DOWN;
1095 break;
1096 case NODE_FAILOVER_END_EVT:
1097 state = SELF_UP_PEER_UP;
1098 break;
1099 case NODE_FAILOVER_BEGIN_EVT:
1100 case SELF_ESTABL_CONTACT_EVT:
1101 case PEER_ESTABL_CONTACT_EVT:
1102 break;
1103 case NODE_SYNCH_BEGIN_EVT:
1104 case NODE_SYNCH_END_EVT:
1105 default:
1106 goto illegal_evt;
1107 }
1108 break;
1109 case NODE_SYNCHING:
1110 switch (evt) {
1111 case SELF_LOST_CONTACT_EVT:
1112 state = SELF_DOWN_PEER_LEAVING;
1113 break;
1114 case PEER_LOST_CONTACT_EVT:
1115 state = SELF_LEAVING_PEER_DOWN;
1116 break;
1117 case NODE_SYNCH_END_EVT:
1118 state = SELF_UP_PEER_UP;
1119 break;
1120 case NODE_FAILOVER_BEGIN_EVT:
1121 state = NODE_FAILINGOVER;
1122 break;
1123 case NODE_SYNCH_BEGIN_EVT:
1124 case SELF_ESTABL_CONTACT_EVT:
1125 case PEER_ESTABL_CONTACT_EVT:
1126 break;
1127 case NODE_FAILOVER_END_EVT:
1128 default:
1129 goto illegal_evt;
1130 }
1131 break;
1132 default:
1133 pr_err("Unknown node fsm state %x\n", state);
1134 break;
1135 }
1136 n->state = state;
1137 return;
1138
1139illegal_evt:
1140 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1141}
1142
1143static void node_lost_contact(struct tipc_node *n,
1144 struct sk_buff_head *inputq)
1145{
1146 struct tipc_sock_conn *conn, *safe;
1147 struct tipc_link *l;
1148 struct list_head *conns = &n->conn_sks;
1149 struct sk_buff *skb;
1150 uint i;
1151
1152 pr_debug("Lost contact with %x\n", n->addr);
1153
1154 /* Clean up broadcast state */
1155 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1156
1157 /* Abort any ongoing link failover */
1158 for (i = 0; i < MAX_BEARERS; i++) {
1159 l = n->links[i].link;
1160 if (l)
1161 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1162 }
1163
1164 /* Notify publications from this node */
1165 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1166
1167 /* Notify sockets connected to node */
1168 list_for_each_entry_safe(conn, safe, conns, list) {
1169 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1170 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1171 conn->peer_node, conn->port,
1172 conn->peer_port, TIPC_ERR_NO_NODE);
1173 if (likely(skb))
1174 skb_queue_tail(inputq, skb);
1175 list_del(&conn->list);
1176 kfree(conn);
1177 }
1178}
1179
1180/**
1181 * tipc_node_get_linkname - get the name of a link
1182 *
1183 * @bearer_id: id of the bearer
1184 * @node: peer node address
1185 * @linkname: link name output buffer
1186 *
1187 * Returns 0 on success
1188 */
1189int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1190 char *linkname, size_t len)
1191{
1192 struct tipc_link *link;
1193 int err = -EINVAL;
1194 struct tipc_node *node = tipc_node_find(net, addr);
1195
1196 if (!node)
1197 return err;
1198
1199 if (bearer_id >= MAX_BEARERS)
1200 goto exit;
1201
1202 tipc_node_read_lock(node);
1203 link = node->links[bearer_id].link;
1204 if (link) {
1205 strncpy(linkname, tipc_link_name(link), len);
1206 err = 0;
1207 }
1208 tipc_node_read_unlock(node);
1209exit:
1210 tipc_node_put(node);
1211 return err;
1212}
1213
1214/* Caller should hold node lock for the passed node */
1215static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1216{
1217 void *hdr;
1218 struct nlattr *attrs;
1219
1220 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1221 NLM_F_MULTI, TIPC_NL_NODE_GET);
1222 if (!hdr)
1223 return -EMSGSIZE;
1224
1225 attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE);
1226 if (!attrs)
1227 goto msg_full;
1228
1229 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1230 goto attr_msg_full;
1231 if (node_is_up(node))
1232 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1233 goto attr_msg_full;
1234
1235 nla_nest_end(msg->skb, attrs);
1236 genlmsg_end(msg->skb, hdr);
1237
1238 return 0;
1239
1240attr_msg_full:
1241 nla_nest_cancel(msg->skb, attrs);
1242msg_full:
1243 genlmsg_cancel(msg->skb, hdr);
1244
1245 return -EMSGSIZE;
1246}
1247
1248/**
1249 * tipc_node_xmit() is the general link level function for message sending
1250 * @net: the applicable net namespace
1251 * @list: chain of buffers containing message
1252 * @dnode: address of destination node
1253 * @selector: a number used for deterministic link selection
1254 * Consumes the buffer chain.
1255 * Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1256 */
1257int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1258 u32 dnode, int selector)
1259{
1260 struct tipc_link_entry *le = NULL;
1261 struct tipc_node *n;
1262 struct sk_buff_head xmitq;
1263 int bearer_id;
1264 int rc;
1265
1266 if (in_own_node(net, dnode)) {
1267 tipc_sk_rcv(net, list);
1268 return 0;
1269 }
1270
1271 n = tipc_node_find(net, dnode);
1272 if (unlikely(!n)) {
1273 skb_queue_purge(list);
1274 return -EHOSTUNREACH;
1275 }
1276
1277 tipc_node_read_lock(n);
1278 bearer_id = n->active_links[selector & 1];
1279 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1280 tipc_node_read_unlock(n);
1281 tipc_node_put(n);
1282 skb_queue_purge(list);
1283 return -EHOSTUNREACH;
1284 }
1285
1286 __skb_queue_head_init(&xmitq);
1287 le = &n->links[bearer_id];
1288 spin_lock_bh(&le->lock);
1289 rc = tipc_link_xmit(le->link, list, &xmitq);
1290 spin_unlock_bh(&le->lock);
1291 tipc_node_read_unlock(n);
1292
1293 if (unlikely(rc == -ENOBUFS))
1294 tipc_node_link_down(n, bearer_id, false);
1295 else
1296 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1297
1298 tipc_node_put(n);
1299
1300 return rc;
1301}
1302
1303/* tipc_node_xmit_skb(): send single buffer to destination
1304 * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
1305 * messages, which will not be rejected
1306 * The only exception is datagram messages rerouted after secondary
1307 * lookup, which are rare and safe to dispose of anyway.
1308 */
1309int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1310 u32 selector)
1311{
1312 struct sk_buff_head head;
1313
1314 skb_queue_head_init(&head);
1315 __skb_queue_tail(&head, skb);
1316 tipc_node_xmit(net, &head, dnode, selector);
1317 return 0;
1318}
1319
1320/* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1321 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1322 */
1323int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1324{
1325 struct sk_buff *skb;
1326 u32 selector, dnode;
1327
1328 while ((skb = __skb_dequeue(xmitq))) {
1329 selector = msg_origport(buf_msg(skb));
1330 dnode = msg_destnode(buf_msg(skb));
1331 tipc_node_xmit_skb(net, skb, dnode, selector);
1332 }
1333 return 0;
1334}
1335
1336void tipc_node_broadcast(struct net *net, struct sk_buff *skb)
1337{
1338 struct sk_buff *txskb;
1339 struct tipc_node *n;
1340 u32 dst;
1341
1342 rcu_read_lock();
1343 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1344 dst = n->addr;
1345 if (in_own_node(net, dst))
1346 continue;
1347 if (!node_is_up(n))
1348 continue;
1349 txskb = pskb_copy(skb, GFP_ATOMIC);
1350 if (!txskb)
1351 break;
1352 msg_set_destnode(buf_msg(txskb), dst);
1353 tipc_node_xmit_skb(net, txskb, dst, 0);
1354 }
1355 rcu_read_unlock();
1356
1357 kfree_skb(skb);
1358}
1359
1360static void tipc_node_mcast_rcv(struct tipc_node *n)
1361{
1362 struct tipc_bclink_entry *be = &n->bc_entry;
1363
1364 /* 'arrvq' is under inputq2's lock protection */
1365 spin_lock_bh(&be->inputq2.lock);
1366 spin_lock_bh(&be->inputq1.lock);
1367 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1368 spin_unlock_bh(&be->inputq1.lock);
1369 spin_unlock_bh(&be->inputq2.lock);
1370 tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1371}
1372
1373static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1374 int bearer_id, struct sk_buff_head *xmitq)
1375{
1376 struct tipc_link *ucl;
1377 int rc;
1378
1379 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr);
1380
1381 if (rc & TIPC_LINK_DOWN_EVT) {
1382 tipc_node_reset_links(n);
1383 return;
1384 }
1385
1386 if (!(rc & TIPC_LINK_SND_STATE))
1387 return;
1388
1389 /* If probe message, a STATE response will be sent anyway */
1390 if (msg_probe(hdr))
1391 return;
1392
1393 /* Produce a STATE message carrying broadcast NACK */
1394 tipc_node_read_lock(n);
1395 ucl = n->links[bearer_id].link;
1396 if (ucl)
1397 tipc_link_build_state_msg(ucl, xmitq);
1398 tipc_node_read_unlock(n);
1399}
1400
1401/**
1402 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1403 * @net: the applicable net namespace
1404 * @skb: TIPC packet
1405 * @bearer_id: id of bearer message arrived on
1406 *
1407 * Invoked with no locks held.
1408 */
1409static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1410{
1411 int rc;
1412 struct sk_buff_head xmitq;
1413 struct tipc_bclink_entry *be;
1414 struct tipc_link_entry *le;
1415 struct tipc_msg *hdr = buf_msg(skb);
1416 int usr = msg_user(hdr);
1417 u32 dnode = msg_destnode(hdr);
1418 struct tipc_node *n;
1419
1420 __skb_queue_head_init(&xmitq);
1421
1422 /* If NACK for other node, let rcv link for that node peek into it */
1423 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1424 n = tipc_node_find(net, dnode);
1425 else
1426 n = tipc_node_find(net, msg_prevnode(hdr));
1427 if (!n) {
1428 kfree_skb(skb);
1429 return;
1430 }
1431 be = &n->bc_entry;
1432 le = &n->links[bearer_id];
1433
1434 rc = tipc_bcast_rcv(net, be->link, skb);
1435
1436 /* Broadcast ACKs are sent on a unicast link */
1437 if (rc & TIPC_LINK_SND_STATE) {
1438 tipc_node_read_lock(n);
1439 tipc_link_build_state_msg(le->link, &xmitq);
1440 tipc_node_read_unlock(n);
1441 }
1442
1443 if (!skb_queue_empty(&xmitq))
1444 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1445
1446 if (!skb_queue_empty(&be->inputq1))
1447 tipc_node_mcast_rcv(n);
1448
1449 /* If reassembly or retransmission failure => reset all links to peer */
1450 if (rc & TIPC_LINK_DOWN_EVT)
1451 tipc_node_reset_links(n);
1452
1453 tipc_node_put(n);
1454}
1455
1456/**
1457 * tipc_node_check_state - check and if necessary update node state
1458 * @skb: TIPC packet
1459 * @bearer_id: identity of bearer delivering the packet
1460 * Returns true if state is ok, otherwise consumes buffer and returns false
1461 */
1462static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1463 int bearer_id, struct sk_buff_head *xmitq)
1464{
1465 struct tipc_msg *hdr = buf_msg(skb);
1466 int usr = msg_user(hdr);
1467 int mtyp = msg_type(hdr);
1468 u16 oseqno = msg_seqno(hdr);
1469 u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
1470 u16 exp_pkts = msg_msgcnt(hdr);
1471 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1472 int state = n->state;
1473 struct tipc_link *l, *tnl, *pl = NULL;
1474 struct tipc_media_addr *maddr;
1475 int pb_id;
1476
1477 l = n->links[bearer_id].link;
1478 if (!l)
1479 return false;
1480 rcv_nxt = tipc_link_rcv_nxt(l);
1481
1482
1483 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1484 return true;
1485
1486 /* Find parallel link, if any */
1487 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1488 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1489 pl = n->links[pb_id].link;
1490 break;
1491 }
1492 }
1493
1494 /* Check and update node accesibility if applicable */
1495 if (state == SELF_UP_PEER_COMING) {
1496 if (!tipc_link_is_up(l))
1497 return true;
1498 if (!msg_peer_link_is_up(hdr))
1499 return true;
1500 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1501 }
1502
1503 if (state == SELF_DOWN_PEER_LEAVING) {
1504 if (msg_peer_node_is_up(hdr))
1505 return false;
1506 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1507 return true;
1508 }
1509
1510 if (state == SELF_LEAVING_PEER_DOWN)
1511 return false;
1512
1513 /* Ignore duplicate packets */
1514 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1515 return true;
1516
1517 /* Initiate or update failover mode if applicable */
1518 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1519 syncpt = oseqno + exp_pkts - 1;
1520 if (pl && tipc_link_is_up(pl)) {
1521 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1522 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
1523 tipc_link_inputq(l));
1524 }
1525 /* If pkts arrive out of order, use lowest calculated syncpt */
1526 if (less(syncpt, n->sync_point))
1527 n->sync_point = syncpt;
1528 }
1529
1530 /* Open parallel link when tunnel link reaches synch point */
1531 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
1532 if (!more(rcv_nxt, n->sync_point))
1533 return true;
1534 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
1535 if (pl)
1536 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
1537 return true;
1538 }
1539
1540 /* No synching needed if only one link */
1541 if (!pl || !tipc_link_is_up(pl))
1542 return true;
1543
1544 /* Initiate synch mode if applicable */
1545 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
1546 syncpt = iseqno + exp_pkts - 1;
1547 if (!tipc_link_is_up(l))
1548 __tipc_node_link_up(n, bearer_id, xmitq);
1549 if (n->state == SELF_UP_PEER_UP) {
1550 n->sync_point = syncpt;
1551 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
1552 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
1553 }
1554 }
1555
1556 /* Open tunnel link when parallel link reaches synch point */
1557 if (n->state == NODE_SYNCHING) {
1558 if (tipc_link_is_synching(l)) {
1559 tnl = l;
1560 } else {
1561 tnl = pl;
1562 pl = l;
1563 }
1564 inputq_len = skb_queue_len(tipc_link_inputq(pl));
1565 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
1566 if (more(dlv_nxt, n->sync_point)) {
1567 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1568 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1569 return true;
1570 }
1571 if (l == pl)
1572 return true;
1573 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
1574 return true;
1575 if (usr == LINK_PROTOCOL)
1576 return true;
1577 return false;
1578 }
1579 return true;
1580}
1581
1582/**
1583 * tipc_rcv - process TIPC packets/messages arriving from off-node
1584 * @net: the applicable net namespace
1585 * @skb: TIPC packet
1586 * @bearer: pointer to bearer message arrived on
1587 *
1588 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1589 * structure (i.e. cannot be NULL), but bearer can be inactive.
1590 */
1591void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
1592{
1593 struct sk_buff_head xmitq;
1594 struct tipc_node *n;
1595 struct tipc_msg *hdr;
1596 int bearer_id = b->identity;
1597 struct tipc_link_entry *le;
1598 u32 self = tipc_own_addr(net);
1599 int usr, rc = 0;
1600 u16 bc_ack;
1601
1602 __skb_queue_head_init(&xmitq);
1603
1604 /* Ensure message is well-formed before touching the header */
1605 if (unlikely(!tipc_msg_validate(&skb)))
1606 goto discard;
1607 hdr = buf_msg(skb);
1608 usr = msg_user(hdr);
1609 bc_ack = msg_bcast_ack(hdr);
1610
1611 /* Handle arrival of discovery or broadcast packet */
1612 if (unlikely(msg_non_seq(hdr))) {
1613 if (unlikely(usr == LINK_CONFIG))
1614 return tipc_disc_rcv(net, skb, b);
1615 else
1616 return tipc_node_bc_rcv(net, skb, bearer_id);
1617 }
1618
1619 /* Discard unicast link messages destined for another node */
1620 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
1621 goto discard;
1622
1623 /* Locate neighboring node that sent packet */
1624 n = tipc_node_find(net, msg_prevnode(hdr));
1625 if (unlikely(!n))
1626 goto discard;
1627 le = &n->links[bearer_id];
1628
1629 /* Ensure broadcast reception is in synch with peer's send state */
1630 if (unlikely(usr == LINK_PROTOCOL))
1631 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
1632 else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack))
1633 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
1634
1635 /* Receive packet directly if conditions permit */
1636 tipc_node_read_lock(n);
1637 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
1638 spin_lock_bh(&le->lock);
1639 if (le->link) {
1640 rc = tipc_link_rcv(le->link, skb, &xmitq);
1641 skb = NULL;
1642 }
1643 spin_unlock_bh(&le->lock);
1644 }
1645 tipc_node_read_unlock(n);
1646
1647 /* Check/update node state before receiving */
1648 if (unlikely(skb)) {
1649 if (unlikely(skb_linearize(skb)))
1650 goto discard;
1651 tipc_node_write_lock(n);
1652 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
1653 if (le->link) {
1654 rc = tipc_link_rcv(le->link, skb, &xmitq);
1655 skb = NULL;
1656 }
1657 }
1658 tipc_node_write_unlock(n);
1659 }
1660
1661 if (unlikely(rc & TIPC_LINK_UP_EVT))
1662 tipc_node_link_up(n, bearer_id, &xmitq);
1663
1664 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
1665 tipc_node_link_down(n, bearer_id, false);
1666
1667 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
1668 tipc_named_rcv(net, &n->bc_entry.namedq);
1669
1670 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
1671 tipc_node_mcast_rcv(n);
1672
1673 if (!skb_queue_empty(&le->inputq))
1674 tipc_sk_rcv(net, &le->inputq);
1675
1676 if (!skb_queue_empty(&xmitq))
1677 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1678
1679 tipc_node_put(n);
1680discard:
1681 kfree_skb(skb);
1682}
1683
1684void tipc_node_apply_tolerance(struct net *net, struct tipc_bearer *b)
1685{
1686 struct tipc_net *tn = tipc_net(net);
1687 int bearer_id = b->identity;
1688 struct sk_buff_head xmitq;
1689 struct tipc_link_entry *e;
1690 struct tipc_node *n;
1691
1692 __skb_queue_head_init(&xmitq);
1693
1694 rcu_read_lock();
1695
1696 list_for_each_entry_rcu(n, &tn->node_list, list) {
1697 tipc_node_write_lock(n);
1698 e = &n->links[bearer_id];
1699 if (e->link)
1700 tipc_link_set_tolerance(e->link, b->tolerance, &xmitq);
1701 tipc_node_write_unlock(n);
1702 tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr);
1703 }
1704
1705 rcu_read_unlock();
1706}
1707
1708int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
1709{
1710 struct net *net = sock_net(skb->sk);
1711 struct tipc_net *tn = net_generic(net, tipc_net_id);
1712 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
1713 struct tipc_node *peer;
1714 u32 addr;
1715 int err;
1716 int i;
1717
1718 /* We identify the peer by its net */
1719 if (!info->attrs[TIPC_NLA_NET])
1720 return -EINVAL;
1721
1722 err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
1723 info->attrs[TIPC_NLA_NET], tipc_nl_net_policy,
1724 info->extack);
1725 if (err)
1726 return err;
1727
1728 if (!attrs[TIPC_NLA_NET_ADDR])
1729 return -EINVAL;
1730
1731 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
1732
1733 if (in_own_node(net, addr))
1734 return -ENOTSUPP;
1735
1736 spin_lock_bh(&tn->node_list_lock);
1737 peer = tipc_node_find(net, addr);
1738 if (!peer) {
1739 spin_unlock_bh(&tn->node_list_lock);
1740 return -ENXIO;
1741 }
1742
1743 tipc_node_write_lock(peer);
1744 if (peer->state != SELF_DOWN_PEER_DOWN &&
1745 peer->state != SELF_DOWN_PEER_LEAVING) {
1746 tipc_node_write_unlock(peer);
1747 err = -EBUSY;
1748 goto err_out;
1749 }
1750
1751 for (i = 0; i < MAX_BEARERS; i++) {
1752 struct tipc_link_entry *le = &peer->links[i];
1753
1754 if (le->link) {
1755 kfree(le->link);
1756 le->link = NULL;
1757 peer->link_cnt--;
1758 }
1759 }
1760 tipc_node_write_unlock(peer);
1761 tipc_node_delete(peer);
1762
1763 err = 0;
1764err_out:
1765 tipc_node_put(peer);
1766 spin_unlock_bh(&tn->node_list_lock);
1767
1768 return err;
1769}
1770
1771int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
1772{
1773 int err;
1774 struct net *net = sock_net(skb->sk);
1775 struct tipc_net *tn = net_generic(net, tipc_net_id);
1776 int done = cb->args[0];
1777 int last_addr = cb->args[1];
1778 struct tipc_node *node;
1779 struct tipc_nl_msg msg;
1780
1781 if (done)
1782 return 0;
1783
1784 msg.skb = skb;
1785 msg.portid = NETLINK_CB(cb->skb).portid;
1786 msg.seq = cb->nlh->nlmsg_seq;
1787
1788 rcu_read_lock();
1789 if (last_addr) {
1790 node = tipc_node_find(net, last_addr);
1791 if (!node) {
1792 rcu_read_unlock();
1793 /* We never set seq or call nl_dump_check_consistent()
1794 * this means that setting prev_seq here will cause the
1795 * consistence check to fail in the netlink callback
1796 * handler. Resulting in the NLMSG_DONE message having
1797 * the NLM_F_DUMP_INTR flag set if the node state
1798 * changed while we released the lock.
1799 */
1800 cb->prev_seq = 1;
1801 return -EPIPE;
1802 }
1803 tipc_node_put(node);
1804 }
1805
1806 list_for_each_entry_rcu(node, &tn->node_list, list) {
1807 if (last_addr) {
1808 if (node->addr == last_addr)
1809 last_addr = 0;
1810 else
1811 continue;
1812 }
1813
1814 tipc_node_read_lock(node);
1815 err = __tipc_nl_add_node(&msg, node);
1816 if (err) {
1817 last_addr = node->addr;
1818 tipc_node_read_unlock(node);
1819 goto out;
1820 }
1821
1822 tipc_node_read_unlock(node);
1823 }
1824 done = 1;
1825out:
1826 cb->args[0] = done;
1827 cb->args[1] = last_addr;
1828 rcu_read_unlock();
1829
1830 return skb->len;
1831}
1832
1833/* tipc_node_find_by_name - locate owner node of link by link's name
1834 * @net: the applicable net namespace
1835 * @name: pointer to link name string
1836 * @bearer_id: pointer to index in 'node->links' array where the link was found.
1837 *
1838 * Returns pointer to node owning the link, or 0 if no matching link is found.
1839 */
1840static struct tipc_node *tipc_node_find_by_name(struct net *net,
1841 const char *link_name,
1842 unsigned int *bearer_id)
1843{
1844 struct tipc_net *tn = net_generic(net, tipc_net_id);
1845 struct tipc_link *l;
1846 struct tipc_node *n;
1847 struct tipc_node *found_node = NULL;
1848 int i;
1849
1850 *bearer_id = 0;
1851 rcu_read_lock();
1852 list_for_each_entry_rcu(n, &tn->node_list, list) {
1853 tipc_node_read_lock(n);
1854 for (i = 0; i < MAX_BEARERS; i++) {
1855 l = n->links[i].link;
1856 if (l && !strcmp(tipc_link_name(l), link_name)) {
1857 *bearer_id = i;
1858 found_node = n;
1859 break;
1860 }
1861 }
1862 tipc_node_read_unlock(n);
1863 if (found_node)
1864 break;
1865 }
1866 rcu_read_unlock();
1867
1868 return found_node;
1869}
1870
1871int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
1872{
1873 int err;
1874 int res = 0;
1875 int bearer_id;
1876 char *name;
1877 struct tipc_link *link;
1878 struct tipc_node *node;
1879 struct sk_buff_head xmitq;
1880 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1881 struct net *net = sock_net(skb->sk);
1882
1883 __skb_queue_head_init(&xmitq);
1884
1885 if (!info->attrs[TIPC_NLA_LINK])
1886 return -EINVAL;
1887
1888 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1889 info->attrs[TIPC_NLA_LINK],
1890 tipc_nl_link_policy, info->extack);
1891 if (err)
1892 return err;
1893
1894 if (!attrs[TIPC_NLA_LINK_NAME])
1895 return -EINVAL;
1896
1897 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1898
1899 if (strcmp(name, tipc_bclink_name) == 0)
1900 return tipc_nl_bc_link_set(net, attrs);
1901
1902 node = tipc_node_find_by_name(net, name, &bearer_id);
1903 if (!node)
1904 return -EINVAL;
1905
1906 tipc_node_read_lock(node);
1907
1908 link = node->links[bearer_id].link;
1909 if (!link) {
1910 res = -EINVAL;
1911 goto out;
1912 }
1913
1914 if (attrs[TIPC_NLA_LINK_PROP]) {
1915 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1916
1917 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
1918 props);
1919 if (err) {
1920 res = err;
1921 goto out;
1922 }
1923
1924 if (props[TIPC_NLA_PROP_TOL]) {
1925 u32 tol;
1926
1927 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1928 tipc_link_set_tolerance(link, tol, &xmitq);
1929 }
1930 if (props[TIPC_NLA_PROP_PRIO]) {
1931 u32 prio;
1932
1933 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1934 tipc_link_set_prio(link, prio, &xmitq);
1935 }
1936 if (props[TIPC_NLA_PROP_WIN]) {
1937 u32 win;
1938
1939 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1940 tipc_link_set_queue_limits(link, win);
1941 }
1942 }
1943
1944out:
1945 tipc_node_read_unlock(node);
1946 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr);
1947 return res;
1948}
1949
1950int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
1951{
1952 struct net *net = genl_info_net(info);
1953 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1954 struct tipc_nl_msg msg;
1955 char *name;
1956 int err;
1957
1958 msg.portid = info->snd_portid;
1959 msg.seq = info->snd_seq;
1960
1961 if (!info->attrs[TIPC_NLA_LINK])
1962 return -EINVAL;
1963
1964 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1965 info->attrs[TIPC_NLA_LINK],
1966 tipc_nl_link_policy, info->extack);
1967 if (err)
1968 return err;
1969
1970 if (!attrs[TIPC_NLA_LINK_NAME])
1971 return -EINVAL;
1972
1973 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1974
1975 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1976 if (!msg.skb)
1977 return -ENOMEM;
1978
1979 if (strcmp(name, tipc_bclink_name) == 0) {
1980 err = tipc_nl_add_bc_link(net, &msg);
1981 if (err)
1982 goto err_free;
1983 } else {
1984 int bearer_id;
1985 struct tipc_node *node;
1986 struct tipc_link *link;
1987
1988 node = tipc_node_find_by_name(net, name, &bearer_id);
1989 if (!node) {
1990 err = -EINVAL;
1991 goto err_free;
1992 }
1993
1994 tipc_node_read_lock(node);
1995 link = node->links[bearer_id].link;
1996 if (!link) {
1997 tipc_node_read_unlock(node);
1998 err = -EINVAL;
1999 goto err_free;
2000 }
2001
2002 err = __tipc_nl_add_link(net, &msg, link, 0);
2003 tipc_node_read_unlock(node);
2004 if (err)
2005 goto err_free;
2006 }
2007
2008 return genlmsg_reply(msg.skb, info);
2009
2010err_free:
2011 nlmsg_free(msg.skb);
2012 return err;
2013}
2014
2015int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2016{
2017 int err;
2018 char *link_name;
2019 unsigned int bearer_id;
2020 struct tipc_link *link;
2021 struct tipc_node *node;
2022 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2023 struct net *net = sock_net(skb->sk);
2024 struct tipc_link_entry *le;
2025
2026 if (!info->attrs[TIPC_NLA_LINK])
2027 return -EINVAL;
2028
2029 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
2030 info->attrs[TIPC_NLA_LINK],
2031 tipc_nl_link_policy, info->extack);
2032 if (err)
2033 return err;
2034
2035 if (!attrs[TIPC_NLA_LINK_NAME])
2036 return -EINVAL;
2037
2038 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2039
2040 if (strcmp(link_name, tipc_bclink_name) == 0) {
2041 err = tipc_bclink_reset_stats(net);
2042 if (err)
2043 return err;
2044 return 0;
2045 }
2046
2047 node = tipc_node_find_by_name(net, link_name, &bearer_id);
2048 if (!node)
2049 return -EINVAL;
2050
2051 le = &node->links[bearer_id];
2052 tipc_node_read_lock(node);
2053 spin_lock_bh(&le->lock);
2054 link = node->links[bearer_id].link;
2055 if (!link) {
2056 spin_unlock_bh(&le->lock);
2057 tipc_node_read_unlock(node);
2058 return -EINVAL;
2059 }
2060 tipc_link_reset_stats(link);
2061 spin_unlock_bh(&le->lock);
2062 tipc_node_read_unlock(node);
2063 return 0;
2064}
2065
2066/* Caller should hold node lock */
2067static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2068 struct tipc_node *node, u32 *prev_link)
2069{
2070 u32 i;
2071 int err;
2072
2073 for (i = *prev_link; i < MAX_BEARERS; i++) {
2074 *prev_link = i;
2075
2076 if (!node->links[i].link)
2077 continue;
2078
2079 err = __tipc_nl_add_link(net, msg,
2080 node->links[i].link, NLM_F_MULTI);
2081 if (err)
2082 return err;
2083 }
2084 *prev_link = 0;
2085
2086 return 0;
2087}
2088
2089int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2090{
2091 struct net *net = sock_net(skb->sk);
2092 struct tipc_net *tn = net_generic(net, tipc_net_id);
2093 struct tipc_node *node;
2094 struct tipc_nl_msg msg;
2095 u32 prev_node = cb->args[0];
2096 u32 prev_link = cb->args[1];
2097 int done = cb->args[2];
2098 int err;
2099
2100 if (done)
2101 return 0;
2102
2103 msg.skb = skb;
2104 msg.portid = NETLINK_CB(cb->skb).portid;
2105 msg.seq = cb->nlh->nlmsg_seq;
2106
2107 rcu_read_lock();
2108 if (prev_node) {
2109 node = tipc_node_find(net, prev_node);
2110 if (!node) {
2111 /* We never set seq or call nl_dump_check_consistent()
2112 * this means that setting prev_seq here will cause the
2113 * consistence check to fail in the netlink callback
2114 * handler. Resulting in the last NLMSG_DONE message
2115 * having the NLM_F_DUMP_INTR flag set.
2116 */
2117 cb->prev_seq = 1;
2118 goto out;
2119 }
2120 tipc_node_put(node);
2121
2122 list_for_each_entry_continue_rcu(node, &tn->node_list,
2123 list) {
2124 tipc_node_read_lock(node);
2125 err = __tipc_nl_add_node_links(net, &msg, node,
2126 &prev_link);
2127 tipc_node_read_unlock(node);
2128 if (err)
2129 goto out;
2130
2131 prev_node = node->addr;
2132 }
2133 } else {
2134 err = tipc_nl_add_bc_link(net, &msg);
2135 if (err)
2136 goto out;
2137
2138 list_for_each_entry_rcu(node, &tn->node_list, list) {
2139 tipc_node_read_lock(node);
2140 err = __tipc_nl_add_node_links(net, &msg, node,
2141 &prev_link);
2142 tipc_node_read_unlock(node);
2143 if (err)
2144 goto out;
2145
2146 prev_node = node->addr;
2147 }
2148 }
2149 done = 1;
2150out:
2151 rcu_read_unlock();
2152
2153 cb->args[0] = prev_node;
2154 cb->args[1] = prev_link;
2155 cb->args[2] = done;
2156
2157 return skb->len;
2158}
2159
2160int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2161{
2162 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2163 struct net *net = sock_net(skb->sk);
2164 int err;
2165
2166 if (!info->attrs[TIPC_NLA_MON])
2167 return -EINVAL;
2168
2169 err = nla_parse_nested(attrs, TIPC_NLA_MON_MAX,
2170 info->attrs[TIPC_NLA_MON],
2171 tipc_nl_monitor_policy, info->extack);
2172 if (err)
2173 return err;
2174
2175 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2176 u32 val;
2177
2178 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2179 err = tipc_nl_monitor_set_threshold(net, val);
2180 if (err)
2181 return err;
2182 }
2183
2184 return 0;
2185}
2186
2187static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2188{
2189 struct nlattr *attrs;
2190 void *hdr;
2191 u32 val;
2192
2193 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2194 0, TIPC_NL_MON_GET);
2195 if (!hdr)
2196 return -EMSGSIZE;
2197
2198 attrs = nla_nest_start(msg->skb, TIPC_NLA_MON);
2199 if (!attrs)
2200 goto msg_full;
2201
2202 val = tipc_nl_monitor_get_threshold(net);
2203
2204 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2205 goto attr_msg_full;
2206
2207 nla_nest_end(msg->skb, attrs);
2208 genlmsg_end(msg->skb, hdr);
2209
2210 return 0;
2211
2212attr_msg_full:
2213 nla_nest_cancel(msg->skb, attrs);
2214msg_full:
2215 genlmsg_cancel(msg->skb, hdr);
2216
2217 return -EMSGSIZE;
2218}
2219
2220int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2221{
2222 struct net *net = sock_net(skb->sk);
2223 struct tipc_nl_msg msg;
2224 int err;
2225
2226 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2227 if (!msg.skb)
2228 return -ENOMEM;
2229 msg.portid = info->snd_portid;
2230 msg.seq = info->snd_seq;
2231
2232 err = __tipc_nl_add_monitor_prop(net, &msg);
2233 if (err) {
2234 nlmsg_free(msg.skb);
2235 return err;
2236 }
2237
2238 return genlmsg_reply(msg.skb, info);
2239}
2240
2241int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2242{
2243 struct net *net = sock_net(skb->sk);
2244 u32 prev_bearer = cb->args[0];
2245 struct tipc_nl_msg msg;
2246 int bearer_id;
2247 int err;
2248
2249 if (prev_bearer == MAX_BEARERS)
2250 return 0;
2251
2252 msg.skb = skb;
2253 msg.portid = NETLINK_CB(cb->skb).portid;
2254 msg.seq = cb->nlh->nlmsg_seq;
2255
2256 rtnl_lock();
2257 for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2258 err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2259 if (err)
2260 break;
2261 }
2262 rtnl_unlock();
2263 cb->args[0] = bearer_id;
2264
2265 return skb->len;
2266}
2267
2268int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2269 struct netlink_callback *cb)
2270{
2271 struct net *net = sock_net(skb->sk);
2272 u32 prev_node = cb->args[1];
2273 u32 bearer_id = cb->args[2];
2274 int done = cb->args[0];
2275 struct tipc_nl_msg msg;
2276 int err;
2277
2278 if (!prev_node) {
2279 struct nlattr **attrs;
2280 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2281
2282 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2283 if (err)
2284 return err;
2285
2286 if (!attrs[TIPC_NLA_MON])
2287 return -EINVAL;
2288
2289 err = nla_parse_nested(mon, TIPC_NLA_MON_MAX,
2290 attrs[TIPC_NLA_MON],
2291 tipc_nl_monitor_policy, NULL);
2292 if (err)
2293 return err;
2294
2295 if (!mon[TIPC_NLA_MON_REF])
2296 return -EINVAL;
2297
2298 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2299
2300 if (bearer_id >= MAX_BEARERS)
2301 return -EINVAL;
2302 }
2303
2304 if (done)
2305 return 0;
2306
2307 msg.skb = skb;
2308 msg.portid = NETLINK_CB(cb->skb).portid;
2309 msg.seq = cb->nlh->nlmsg_seq;
2310
2311 rtnl_lock();
2312 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2313 if (!err)
2314 done = 1;
2315
2316 rtnl_unlock();
2317 cb->args[0] = done;
2318 cb->args[1] = prev_node;
2319 cb->args[2] = bearer_id;
2320
2321 return skb->len;
2322}