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1/*
2 * net/tipc/node.c: TIPC node management routines
3 *
4 * Copyright (c) 2000-2006, 2012-2016, Ericsson AB
5 * Copyright (c) 2005-2006, 2010-2014, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "link.h"
39#include "node.h"
40#include "name_distr.h"
41#include "socket.h"
42#include "bcast.h"
43#include "monitor.h"
44#include "discover.h"
45#include "netlink.h"
46#include "trace.h"
47#include "crypto.h"
48
49#define INVALID_NODE_SIG 0x10000
50#define NODE_CLEANUP_AFTER 300000
51
52/* Flags used to take different actions according to flag type
53 * TIPC_NOTIFY_NODE_DOWN: notify node is down
54 * TIPC_NOTIFY_NODE_UP: notify node is up
55 * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
56 */
57enum {
58 TIPC_NOTIFY_NODE_DOWN = (1 << 3),
59 TIPC_NOTIFY_NODE_UP = (1 << 4),
60 TIPC_NOTIFY_LINK_UP = (1 << 6),
61 TIPC_NOTIFY_LINK_DOWN = (1 << 7)
62};
63
64struct tipc_link_entry {
65 struct tipc_link *link;
66 spinlock_t lock; /* per link */
67 u32 mtu;
68 struct sk_buff_head inputq;
69 struct tipc_media_addr maddr;
70};
71
72struct tipc_bclink_entry {
73 struct tipc_link *link;
74 struct sk_buff_head inputq1;
75 struct sk_buff_head arrvq;
76 struct sk_buff_head inputq2;
77 struct sk_buff_head namedq;
78 u16 named_rcv_nxt;
79 bool named_open;
80};
81
82/**
83 * struct tipc_node - TIPC node structure
84 * @addr: network address of node
85 * @kref: reference counter to node object
86 * @lock: rwlock governing access to structure
87 * @net: the applicable net namespace
88 * @hash: links to adjacent nodes in unsorted hash chain
89 * @inputq: pointer to input queue containing messages for msg event
90 * @namedq: pointer to name table input queue with name table messages
91 * @active_links: bearer ids of active links, used as index into links[] array
92 * @links: array containing references to all links to node
93 * @bc_entry: broadcast link entry
94 * @action_flags: bit mask of different types of node actions
95 * @state: connectivity state vs peer node
96 * @preliminary: a preliminary node or not
97 * @failover_sent: failover sent or not
98 * @sync_point: sequence number where synch/failover is finished
99 * @list: links to adjacent nodes in sorted list of cluster's nodes
100 * @working_links: number of working links to node (both active and standby)
101 * @link_cnt: number of links to node
102 * @capabilities: bitmap, indicating peer node's functional capabilities
103 * @signature: node instance identifier
104 * @link_id: local and remote bearer ids of changing link, if any
105 * @peer_id: 128-bit ID of peer
106 * @peer_id_string: ID string of peer
107 * @publ_list: list of publications
108 * @conn_sks: list of connections (FIXME)
109 * @timer: node's keepalive timer
110 * @keepalive_intv: keepalive interval in milliseconds
111 * @rcu: rcu struct for tipc_node
112 * @delete_at: indicates the time for deleting a down node
113 * @peer_net: peer's net namespace
114 * @peer_hash_mix: hash for this peer (FIXME)
115 * @crypto_rx: RX crypto handler
116 */
117struct tipc_node {
118 u32 addr;
119 struct kref kref;
120 rwlock_t lock;
121 struct net *net;
122 struct hlist_node hash;
123 int active_links[2];
124 struct tipc_link_entry links[MAX_BEARERS];
125 struct tipc_bclink_entry bc_entry;
126 int action_flags;
127 struct list_head list;
128 int state;
129 bool preliminary;
130 bool failover_sent;
131 u16 sync_point;
132 int link_cnt;
133 u16 working_links;
134 u16 capabilities;
135 u32 signature;
136 u32 link_id;
137 u8 peer_id[16];
138 char peer_id_string[NODE_ID_STR_LEN];
139 struct list_head publ_list;
140 struct list_head conn_sks;
141 unsigned long keepalive_intv;
142 struct timer_list timer;
143 struct rcu_head rcu;
144 unsigned long delete_at;
145 struct net *peer_net;
146 u32 peer_hash_mix;
147#ifdef CONFIG_TIPC_CRYPTO
148 struct tipc_crypto *crypto_rx;
149#endif
150};
151
152/* Node FSM states and events:
153 */
154enum {
155 SELF_DOWN_PEER_DOWN = 0xdd,
156 SELF_UP_PEER_UP = 0xaa,
157 SELF_DOWN_PEER_LEAVING = 0xd1,
158 SELF_UP_PEER_COMING = 0xac,
159 SELF_COMING_PEER_UP = 0xca,
160 SELF_LEAVING_PEER_DOWN = 0x1d,
161 NODE_FAILINGOVER = 0xf0,
162 NODE_SYNCHING = 0xcc
163};
164
165enum {
166 SELF_ESTABL_CONTACT_EVT = 0xece,
167 SELF_LOST_CONTACT_EVT = 0x1ce,
168 PEER_ESTABL_CONTACT_EVT = 0x9ece,
169 PEER_LOST_CONTACT_EVT = 0x91ce,
170 NODE_FAILOVER_BEGIN_EVT = 0xfbe,
171 NODE_FAILOVER_END_EVT = 0xfee,
172 NODE_SYNCH_BEGIN_EVT = 0xcbe,
173 NODE_SYNCH_END_EVT = 0xcee
174};
175
176static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
177 struct sk_buff_head *xmitq,
178 struct tipc_media_addr **maddr);
179static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
180 bool delete);
181static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
182static void tipc_node_delete(struct tipc_node *node);
183static void tipc_node_timeout(struct timer_list *t);
184static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
185static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
186static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
187static bool node_is_up(struct tipc_node *n);
188static void tipc_node_delete_from_list(struct tipc_node *node);
189
190struct tipc_sock_conn {
191 u32 port;
192 u32 peer_port;
193 u32 peer_node;
194 struct list_head list;
195};
196
197static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
198{
199 int bearer_id = n->active_links[sel & 1];
200
201 if (unlikely(bearer_id == INVALID_BEARER_ID))
202 return NULL;
203
204 return n->links[bearer_id].link;
205}
206
207int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel, bool connected)
208{
209 struct tipc_node *n;
210 int bearer_id;
211 unsigned int mtu = MAX_MSG_SIZE;
212
213 n = tipc_node_find(net, addr);
214 if (unlikely(!n))
215 return mtu;
216
217 /* Allow MAX_MSG_SIZE when building connection oriented message
218 * if they are in the same core network
219 */
220 if (n->peer_net && connected) {
221 tipc_node_put(n);
222 return mtu;
223 }
224
225 bearer_id = n->active_links[sel & 1];
226 if (likely(bearer_id != INVALID_BEARER_ID))
227 mtu = n->links[bearer_id].mtu;
228 tipc_node_put(n);
229 return mtu;
230}
231
232bool tipc_node_get_id(struct net *net, u32 addr, u8 *id)
233{
234 u8 *own_id = tipc_own_id(net);
235 struct tipc_node *n;
236
237 if (!own_id)
238 return true;
239
240 if (addr == tipc_own_addr(net)) {
241 memcpy(id, own_id, TIPC_NODEID_LEN);
242 return true;
243 }
244 n = tipc_node_find(net, addr);
245 if (!n)
246 return false;
247
248 memcpy(id, &n->peer_id, TIPC_NODEID_LEN);
249 tipc_node_put(n);
250 return true;
251}
252
253u16 tipc_node_get_capabilities(struct net *net, u32 addr)
254{
255 struct tipc_node *n;
256 u16 caps;
257
258 n = tipc_node_find(net, addr);
259 if (unlikely(!n))
260 return TIPC_NODE_CAPABILITIES;
261 caps = n->capabilities;
262 tipc_node_put(n);
263 return caps;
264}
265
266u32 tipc_node_get_addr(struct tipc_node *node)
267{
268 return (node) ? node->addr : 0;
269}
270
271char *tipc_node_get_id_str(struct tipc_node *node)
272{
273 return node->peer_id_string;
274}
275
276#ifdef CONFIG_TIPC_CRYPTO
277/**
278 * tipc_node_crypto_rx - Retrieve crypto RX handle from node
279 * @__n: target tipc_node
280 * Note: node ref counter must be held first!
281 */
282struct tipc_crypto *tipc_node_crypto_rx(struct tipc_node *__n)
283{
284 return (__n) ? __n->crypto_rx : NULL;
285}
286
287struct tipc_crypto *tipc_node_crypto_rx_by_list(struct list_head *pos)
288{
289 return container_of(pos, struct tipc_node, list)->crypto_rx;
290}
291
292struct tipc_crypto *tipc_node_crypto_rx_by_addr(struct net *net, u32 addr)
293{
294 struct tipc_node *n;
295
296 n = tipc_node_find(net, addr);
297 return (n) ? n->crypto_rx : NULL;
298}
299#endif
300
301static void tipc_node_free(struct rcu_head *rp)
302{
303 struct tipc_node *n = container_of(rp, struct tipc_node, rcu);
304
305#ifdef CONFIG_TIPC_CRYPTO
306 tipc_crypto_stop(&n->crypto_rx);
307#endif
308 kfree(n);
309}
310
311static void tipc_node_kref_release(struct kref *kref)
312{
313 struct tipc_node *n = container_of(kref, struct tipc_node, kref);
314
315 kfree(n->bc_entry.link);
316 call_rcu(&n->rcu, tipc_node_free);
317}
318
319void tipc_node_put(struct tipc_node *node)
320{
321 kref_put(&node->kref, tipc_node_kref_release);
322}
323
324void tipc_node_get(struct tipc_node *node)
325{
326 kref_get(&node->kref);
327}
328
329/*
330 * tipc_node_find - locate specified node object, if it exists
331 */
332static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
333{
334 struct tipc_net *tn = tipc_net(net);
335 struct tipc_node *node;
336 unsigned int thash = tipc_hashfn(addr);
337
338 rcu_read_lock();
339 hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
340 if (node->addr != addr || node->preliminary)
341 continue;
342 if (!kref_get_unless_zero(&node->kref))
343 node = NULL;
344 break;
345 }
346 rcu_read_unlock();
347 return node;
348}
349
350/* tipc_node_find_by_id - locate specified node object by its 128-bit id
351 * Note: this function is called only when a discovery request failed
352 * to find the node by its 32-bit id, and is not time critical
353 */
354static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id)
355{
356 struct tipc_net *tn = tipc_net(net);
357 struct tipc_node *n;
358 bool found = false;
359
360 rcu_read_lock();
361 list_for_each_entry_rcu(n, &tn->node_list, list) {
362 read_lock_bh(&n->lock);
363 if (!memcmp(id, n->peer_id, 16) &&
364 kref_get_unless_zero(&n->kref))
365 found = true;
366 read_unlock_bh(&n->lock);
367 if (found)
368 break;
369 }
370 rcu_read_unlock();
371 return found ? n : NULL;
372}
373
374static void tipc_node_read_lock(struct tipc_node *n)
375 __acquires(n->lock)
376{
377 read_lock_bh(&n->lock);
378}
379
380static void tipc_node_read_unlock(struct tipc_node *n)
381 __releases(n->lock)
382{
383 read_unlock_bh(&n->lock);
384}
385
386static void tipc_node_write_lock(struct tipc_node *n)
387 __acquires(n->lock)
388{
389 write_lock_bh(&n->lock);
390}
391
392static void tipc_node_write_unlock_fast(struct tipc_node *n)
393 __releases(n->lock)
394{
395 write_unlock_bh(&n->lock);
396}
397
398static void tipc_node_write_unlock(struct tipc_node *n)
399 __releases(n->lock)
400{
401 struct tipc_socket_addr sk;
402 struct net *net = n->net;
403 u32 flags = n->action_flags;
404 struct list_head *publ_list;
405 struct tipc_uaddr ua;
406 u32 bearer_id;
407
408 if (likely(!flags)) {
409 write_unlock_bh(&n->lock);
410 return;
411 }
412
413 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_NODE_SCOPE,
414 TIPC_LINK_STATE, n->addr, n->addr);
415 sk.ref = n->link_id;
416 sk.node = n->addr;
417 bearer_id = n->link_id & 0xffff;
418 publ_list = &n->publ_list;
419
420 n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
421 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
422
423 write_unlock_bh(&n->lock);
424
425 if (flags & TIPC_NOTIFY_NODE_DOWN)
426 tipc_publ_notify(net, publ_list, sk.node, n->capabilities);
427
428 if (flags & TIPC_NOTIFY_NODE_UP)
429 tipc_named_node_up(net, sk.node, n->capabilities);
430
431 if (flags & TIPC_NOTIFY_LINK_UP) {
432 tipc_mon_peer_up(net, sk.node, bearer_id);
433 tipc_nametbl_publish(net, &ua, &sk, sk.ref);
434 }
435 if (flags & TIPC_NOTIFY_LINK_DOWN) {
436 tipc_mon_peer_down(net, sk.node, bearer_id);
437 tipc_nametbl_withdraw(net, &ua, &sk, sk.ref);
438 }
439}
440
441static void tipc_node_assign_peer_net(struct tipc_node *n, u32 hash_mixes)
442{
443 int net_id = tipc_netid(n->net);
444 struct tipc_net *tn_peer;
445 struct net *tmp;
446 u32 hash_chk;
447
448 if (n->peer_net)
449 return;
450
451 for_each_net_rcu(tmp) {
452 tn_peer = tipc_net(tmp);
453 if (!tn_peer)
454 continue;
455 /* Integrity checking whether node exists in namespace or not */
456 if (tn_peer->net_id != net_id)
457 continue;
458 if (memcmp(n->peer_id, tn_peer->node_id, NODE_ID_LEN))
459 continue;
460 hash_chk = tipc_net_hash_mixes(tmp, tn_peer->random);
461 if (hash_mixes ^ hash_chk)
462 continue;
463 n->peer_net = tmp;
464 n->peer_hash_mix = hash_mixes;
465 break;
466 }
467}
468
469struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
470 u16 capabilities, u32 hash_mixes,
471 bool preliminary)
472{
473 struct tipc_net *tn = net_generic(net, tipc_net_id);
474 struct tipc_node *n, *temp_node;
475 struct tipc_link *l;
476 unsigned long intv;
477 int bearer_id;
478 int i;
479
480 spin_lock_bh(&tn->node_list_lock);
481 n = tipc_node_find(net, addr) ?:
482 tipc_node_find_by_id(net, peer_id);
483 if (n) {
484 if (!n->preliminary)
485 goto update;
486 if (preliminary)
487 goto exit;
488 /* A preliminary node becomes "real" now, refresh its data */
489 tipc_node_write_lock(n);
490 n->preliminary = false;
491 n->addr = addr;
492 hlist_del_rcu(&n->hash);
493 hlist_add_head_rcu(&n->hash,
494 &tn->node_htable[tipc_hashfn(addr)]);
495 list_del_rcu(&n->list);
496 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
497 if (n->addr < temp_node->addr)
498 break;
499 }
500 list_add_tail_rcu(&n->list, &temp_node->list);
501 tipc_node_write_unlock_fast(n);
502
503update:
504 if (n->peer_hash_mix ^ hash_mixes)
505 tipc_node_assign_peer_net(n, hash_mixes);
506 if (n->capabilities == capabilities)
507 goto exit;
508 /* Same node may come back with new capabilities */
509 tipc_node_write_lock(n);
510 n->capabilities = capabilities;
511 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
512 l = n->links[bearer_id].link;
513 if (l)
514 tipc_link_update_caps(l, capabilities);
515 }
516 tipc_node_write_unlock_fast(n);
517
518 /* Calculate cluster capabilities */
519 tn->capabilities = TIPC_NODE_CAPABILITIES;
520 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
521 tn->capabilities &= temp_node->capabilities;
522 }
523
524 tipc_bcast_toggle_rcast(net,
525 (tn->capabilities & TIPC_BCAST_RCAST));
526
527 goto exit;
528 }
529 n = kzalloc(sizeof(*n), GFP_ATOMIC);
530 if (!n) {
531 pr_warn("Node creation failed, no memory\n");
532 goto exit;
533 }
534 tipc_nodeid2string(n->peer_id_string, peer_id);
535#ifdef CONFIG_TIPC_CRYPTO
536 if (unlikely(tipc_crypto_start(&n->crypto_rx, net, n))) {
537 pr_warn("Failed to start crypto RX(%s)!\n", n->peer_id_string);
538 kfree(n);
539 n = NULL;
540 goto exit;
541 }
542#endif
543 n->addr = addr;
544 n->preliminary = preliminary;
545 memcpy(&n->peer_id, peer_id, 16);
546 n->net = net;
547 n->peer_net = NULL;
548 n->peer_hash_mix = 0;
549 /* Assign kernel local namespace if exists */
550 tipc_node_assign_peer_net(n, hash_mixes);
551 n->capabilities = capabilities;
552 kref_init(&n->kref);
553 rwlock_init(&n->lock);
554 INIT_HLIST_NODE(&n->hash);
555 INIT_LIST_HEAD(&n->list);
556 INIT_LIST_HEAD(&n->publ_list);
557 INIT_LIST_HEAD(&n->conn_sks);
558 skb_queue_head_init(&n->bc_entry.namedq);
559 skb_queue_head_init(&n->bc_entry.inputq1);
560 __skb_queue_head_init(&n->bc_entry.arrvq);
561 skb_queue_head_init(&n->bc_entry.inputq2);
562 for (i = 0; i < MAX_BEARERS; i++)
563 spin_lock_init(&n->links[i].lock);
564 n->state = SELF_DOWN_PEER_LEAVING;
565 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
566 n->signature = INVALID_NODE_SIG;
567 n->active_links[0] = INVALID_BEARER_ID;
568 n->active_links[1] = INVALID_BEARER_ID;
569 n->bc_entry.link = NULL;
570 tipc_node_get(n);
571 timer_setup(&n->timer, tipc_node_timeout, 0);
572 /* Start a slow timer anyway, crypto needs it */
573 n->keepalive_intv = 10000;
574 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
575 if (!mod_timer(&n->timer, intv))
576 tipc_node_get(n);
577 hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
578 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
579 if (n->addr < temp_node->addr)
580 break;
581 }
582 list_add_tail_rcu(&n->list, &temp_node->list);
583 /* Calculate cluster capabilities */
584 tn->capabilities = TIPC_NODE_CAPABILITIES;
585 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
586 tn->capabilities &= temp_node->capabilities;
587 }
588 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
589 trace_tipc_node_create(n, true, " ");
590exit:
591 spin_unlock_bh(&tn->node_list_lock);
592 return n;
593}
594
595static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
596{
597 unsigned long tol = tipc_link_tolerance(l);
598 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
599
600 /* Link with lowest tolerance determines timer interval */
601 if (intv < n->keepalive_intv)
602 n->keepalive_intv = intv;
603
604 /* Ensure link's abort limit corresponds to current tolerance */
605 tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
606}
607
608static void tipc_node_delete_from_list(struct tipc_node *node)
609{
610#ifdef CONFIG_TIPC_CRYPTO
611 tipc_crypto_key_flush(node->crypto_rx);
612#endif
613 list_del_rcu(&node->list);
614 hlist_del_rcu(&node->hash);
615 tipc_node_put(node);
616}
617
618static void tipc_node_delete(struct tipc_node *node)
619{
620 trace_tipc_node_delete(node, true, " ");
621 tipc_node_delete_from_list(node);
622
623 del_timer_sync(&node->timer);
624 tipc_node_put(node);
625}
626
627void tipc_node_stop(struct net *net)
628{
629 struct tipc_net *tn = tipc_net(net);
630 struct tipc_node *node, *t_node;
631
632 spin_lock_bh(&tn->node_list_lock);
633 list_for_each_entry_safe(node, t_node, &tn->node_list, list)
634 tipc_node_delete(node);
635 spin_unlock_bh(&tn->node_list_lock);
636}
637
638void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
639{
640 struct tipc_node *n;
641
642 if (in_own_node(net, addr))
643 return;
644
645 n = tipc_node_find(net, addr);
646 if (!n) {
647 pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
648 return;
649 }
650 tipc_node_write_lock(n);
651 list_add_tail(subscr, &n->publ_list);
652 tipc_node_write_unlock_fast(n);
653 tipc_node_put(n);
654}
655
656void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
657{
658 struct tipc_node *n;
659
660 if (in_own_node(net, addr))
661 return;
662
663 n = tipc_node_find(net, addr);
664 if (!n) {
665 pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
666 return;
667 }
668 tipc_node_write_lock(n);
669 list_del_init(subscr);
670 tipc_node_write_unlock_fast(n);
671 tipc_node_put(n);
672}
673
674int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
675{
676 struct tipc_node *node;
677 struct tipc_sock_conn *conn;
678 int err = 0;
679
680 if (in_own_node(net, dnode))
681 return 0;
682
683 node = tipc_node_find(net, dnode);
684 if (!node) {
685 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
686 return -EHOSTUNREACH;
687 }
688 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
689 if (!conn) {
690 err = -EHOSTUNREACH;
691 goto exit;
692 }
693 conn->peer_node = dnode;
694 conn->port = port;
695 conn->peer_port = peer_port;
696
697 tipc_node_write_lock(node);
698 list_add_tail(&conn->list, &node->conn_sks);
699 tipc_node_write_unlock(node);
700exit:
701 tipc_node_put(node);
702 return err;
703}
704
705void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
706{
707 struct tipc_node *node;
708 struct tipc_sock_conn *conn, *safe;
709
710 if (in_own_node(net, dnode))
711 return;
712
713 node = tipc_node_find(net, dnode);
714 if (!node)
715 return;
716
717 tipc_node_write_lock(node);
718 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
719 if (port != conn->port)
720 continue;
721 list_del(&conn->list);
722 kfree(conn);
723 }
724 tipc_node_write_unlock(node);
725 tipc_node_put(node);
726}
727
728static void tipc_node_clear_links(struct tipc_node *node)
729{
730 int i;
731
732 for (i = 0; i < MAX_BEARERS; i++) {
733 struct tipc_link_entry *le = &node->links[i];
734
735 if (le->link) {
736 kfree(le->link);
737 le->link = NULL;
738 node->link_cnt--;
739 }
740 }
741}
742
743/* tipc_node_cleanup - delete nodes that does not
744 * have active links for NODE_CLEANUP_AFTER time
745 */
746static bool tipc_node_cleanup(struct tipc_node *peer)
747{
748 struct tipc_node *temp_node;
749 struct tipc_net *tn = tipc_net(peer->net);
750 bool deleted = false;
751
752 /* If lock held by tipc_node_stop() the node will be deleted anyway */
753 if (!spin_trylock_bh(&tn->node_list_lock))
754 return false;
755
756 tipc_node_write_lock(peer);
757
758 if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) {
759 tipc_node_clear_links(peer);
760 tipc_node_delete_from_list(peer);
761 deleted = true;
762 }
763 tipc_node_write_unlock(peer);
764
765 if (!deleted) {
766 spin_unlock_bh(&tn->node_list_lock);
767 return deleted;
768 }
769
770 /* Calculate cluster capabilities */
771 tn->capabilities = TIPC_NODE_CAPABILITIES;
772 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
773 tn->capabilities &= temp_node->capabilities;
774 }
775 tipc_bcast_toggle_rcast(peer->net,
776 (tn->capabilities & TIPC_BCAST_RCAST));
777 spin_unlock_bh(&tn->node_list_lock);
778 return deleted;
779}
780
781/* tipc_node_timeout - handle expiration of node timer
782 */
783static void tipc_node_timeout(struct timer_list *t)
784{
785 struct tipc_node *n = from_timer(n, t, timer);
786 struct tipc_link_entry *le;
787 struct sk_buff_head xmitq;
788 int remains = n->link_cnt;
789 int bearer_id;
790 int rc = 0;
791
792 trace_tipc_node_timeout(n, false, " ");
793 if (!node_is_up(n) && tipc_node_cleanup(n)) {
794 /*Removing the reference of Timer*/
795 tipc_node_put(n);
796 return;
797 }
798
799#ifdef CONFIG_TIPC_CRYPTO
800 /* Take any crypto key related actions first */
801 tipc_crypto_timeout(n->crypto_rx);
802#endif
803 __skb_queue_head_init(&xmitq);
804
805 /* Initial node interval to value larger (10 seconds), then it will be
806 * recalculated with link lowest tolerance
807 */
808 tipc_node_read_lock(n);
809 n->keepalive_intv = 10000;
810 tipc_node_read_unlock(n);
811 for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) {
812 tipc_node_read_lock(n);
813 le = &n->links[bearer_id];
814 if (le->link) {
815 spin_lock_bh(&le->lock);
816 /* Link tolerance may change asynchronously: */
817 tipc_node_calculate_timer(n, le->link);
818 rc = tipc_link_timeout(le->link, &xmitq);
819 spin_unlock_bh(&le->lock);
820 remains--;
821 }
822 tipc_node_read_unlock(n);
823 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr, n);
824 if (rc & TIPC_LINK_DOWN_EVT)
825 tipc_node_link_down(n, bearer_id, false);
826 }
827 mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
828}
829
830/**
831 * __tipc_node_link_up - handle addition of link
832 * @n: target tipc_node
833 * @bearer_id: id of the bearer
834 * @xmitq: queue for messages to be xmited on
835 * Node lock must be held by caller
836 * Link becomes active (alone or shared) or standby, depending on its priority.
837 */
838static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
839 struct sk_buff_head *xmitq)
840{
841 int *slot0 = &n->active_links[0];
842 int *slot1 = &n->active_links[1];
843 struct tipc_link *ol = node_active_link(n, 0);
844 struct tipc_link *nl = n->links[bearer_id].link;
845
846 if (!nl || tipc_link_is_up(nl))
847 return;
848
849 tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
850 if (!tipc_link_is_up(nl))
851 return;
852
853 n->working_links++;
854 n->action_flags |= TIPC_NOTIFY_LINK_UP;
855 n->link_id = tipc_link_id(nl);
856
857 /* Leave room for tunnel header when returning 'mtu' to users: */
858 n->links[bearer_id].mtu = tipc_link_mss(nl);
859
860 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
861 tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
862
863 pr_debug("Established link <%s> on network plane %c\n",
864 tipc_link_name(nl), tipc_link_plane(nl));
865 trace_tipc_node_link_up(n, true, " ");
866
867 /* Ensure that a STATE message goes first */
868 tipc_link_build_state_msg(nl, xmitq);
869
870 /* First link? => give it both slots */
871 if (!ol) {
872 *slot0 = bearer_id;
873 *slot1 = bearer_id;
874 tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
875 n->action_flags |= TIPC_NOTIFY_NODE_UP;
876 tipc_link_set_active(nl, true);
877 tipc_bcast_add_peer(n->net, nl, xmitq);
878 return;
879 }
880
881 /* Second link => redistribute slots */
882 if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
883 pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
884 *slot0 = bearer_id;
885 *slot1 = bearer_id;
886 tipc_link_set_active(nl, true);
887 tipc_link_set_active(ol, false);
888 } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
889 tipc_link_set_active(nl, true);
890 *slot1 = bearer_id;
891 } else {
892 pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
893 }
894
895 /* Prepare synchronization with first link */
896 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
897}
898
899/**
900 * tipc_node_link_up - handle addition of link
901 * @n: target tipc_node
902 * @bearer_id: id of the bearer
903 * @xmitq: queue for messages to be xmited on
904 *
905 * Link becomes active (alone or shared) or standby, depending on its priority.
906 */
907static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
908 struct sk_buff_head *xmitq)
909{
910 struct tipc_media_addr *maddr;
911
912 tipc_node_write_lock(n);
913 __tipc_node_link_up(n, bearer_id, xmitq);
914 maddr = &n->links[bearer_id].maddr;
915 tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr, n);
916 tipc_node_write_unlock(n);
917}
918
919/**
920 * tipc_node_link_failover() - start failover in case "half-failover"
921 *
922 * This function is only called in a very special situation where link
923 * failover can be already started on peer node but not on this node.
924 * This can happen when e.g.::
925 *
926 * 1. Both links <1A-2A>, <1B-2B> down
927 * 2. Link endpoint 2A up, but 1A still down (e.g. due to network
928 * disturbance, wrong session, etc.)
929 * 3. Link <1B-2B> up
930 * 4. Link endpoint 2A down (e.g. due to link tolerance timeout)
931 * 5. Node 2 starts failover onto link <1B-2B>
932 *
933 * ==> Node 1 does never start link/node failover!
934 *
935 * @n: tipc node structure
936 * @l: link peer endpoint failingover (- can be NULL)
937 * @tnl: tunnel link
938 * @xmitq: queue for messages to be xmited on tnl link later
939 */
940static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,
941 struct tipc_link *tnl,
942 struct sk_buff_head *xmitq)
943{
944 /* Avoid to be "self-failover" that can never end */
945 if (!tipc_link_is_up(tnl))
946 return;
947
948 /* Don't rush, failure link may be in the process of resetting */
949 if (l && !tipc_link_is_reset(l))
950 return;
951
952 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
953 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
954
955 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
956 tipc_link_failover_prepare(l, tnl, xmitq);
957
958 if (l)
959 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
960 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
961}
962
963/**
964 * __tipc_node_link_down - handle loss of link
965 * @n: target tipc_node
966 * @bearer_id: id of the bearer
967 * @xmitq: queue for messages to be xmited on
968 * @maddr: output media address of the bearer
969 */
970static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
971 struct sk_buff_head *xmitq,
972 struct tipc_media_addr **maddr)
973{
974 struct tipc_link_entry *le = &n->links[*bearer_id];
975 int *slot0 = &n->active_links[0];
976 int *slot1 = &n->active_links[1];
977 int i, highest = 0, prio;
978 struct tipc_link *l, *_l, *tnl;
979
980 l = n->links[*bearer_id].link;
981 if (!l || tipc_link_is_reset(l))
982 return;
983
984 n->working_links--;
985 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
986 n->link_id = tipc_link_id(l);
987
988 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
989
990 pr_debug("Lost link <%s> on network plane %c\n",
991 tipc_link_name(l), tipc_link_plane(l));
992
993 /* Select new active link if any available */
994 *slot0 = INVALID_BEARER_ID;
995 *slot1 = INVALID_BEARER_ID;
996 for (i = 0; i < MAX_BEARERS; i++) {
997 _l = n->links[i].link;
998 if (!_l || !tipc_link_is_up(_l))
999 continue;
1000 if (_l == l)
1001 continue;
1002 prio = tipc_link_prio(_l);
1003 if (prio < highest)
1004 continue;
1005 if (prio > highest) {
1006 highest = prio;
1007 *slot0 = i;
1008 *slot1 = i;
1009 continue;
1010 }
1011 *slot1 = i;
1012 }
1013
1014 if (!node_is_up(n)) {
1015 if (tipc_link_peer_is_down(l))
1016 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1017 tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
1018 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!");
1019 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1020 tipc_link_reset(l);
1021 tipc_link_build_reset_msg(l, xmitq);
1022 *maddr = &n->links[*bearer_id].maddr;
1023 node_lost_contact(n, &le->inputq);
1024 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1025 return;
1026 }
1027 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1028
1029 /* There is still a working link => initiate failover */
1030 *bearer_id = n->active_links[0];
1031 tnl = n->links[*bearer_id].link;
1032 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1033 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1034 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
1035 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
1036 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!");
1037 tipc_link_reset(l);
1038 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1039 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1040 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
1041 *maddr = &n->links[*bearer_id].maddr;
1042}
1043
1044static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
1045{
1046 struct tipc_link_entry *le = &n->links[bearer_id];
1047 struct tipc_media_addr *maddr = NULL;
1048 struct tipc_link *l = le->link;
1049 int old_bearer_id = bearer_id;
1050 struct sk_buff_head xmitq;
1051
1052 if (!l)
1053 return;
1054
1055 __skb_queue_head_init(&xmitq);
1056
1057 tipc_node_write_lock(n);
1058 if (!tipc_link_is_establishing(l)) {
1059 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
1060 } else {
1061 /* Defuse pending tipc_node_link_up() */
1062 tipc_link_reset(l);
1063 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1064 }
1065 if (delete) {
1066 kfree(l);
1067 le->link = NULL;
1068 n->link_cnt--;
1069 }
1070 trace_tipc_node_link_down(n, true, "node link down or deleted!");
1071 tipc_node_write_unlock(n);
1072 if (delete)
1073 tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
1074 if (!skb_queue_empty(&xmitq))
1075 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr, n);
1076 tipc_sk_rcv(n->net, &le->inputq);
1077}
1078
1079static bool node_is_up(struct tipc_node *n)
1080{
1081 return n->active_links[0] != INVALID_BEARER_ID;
1082}
1083
1084bool tipc_node_is_up(struct net *net, u32 addr)
1085{
1086 struct tipc_node *n;
1087 bool retval = false;
1088
1089 if (in_own_node(net, addr))
1090 return true;
1091
1092 n = tipc_node_find(net, addr);
1093 if (!n)
1094 return false;
1095 retval = node_is_up(n);
1096 tipc_node_put(n);
1097 return retval;
1098}
1099
1100static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
1101{
1102 struct tipc_node *n;
1103
1104 addr ^= tipc_net(net)->random;
1105 while ((n = tipc_node_find(net, addr))) {
1106 tipc_node_put(n);
1107 addr++;
1108 }
1109 return addr;
1110}
1111
1112/* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
1113 * Returns suggested address if any, otherwise 0
1114 */
1115u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
1116{
1117 struct tipc_net *tn = tipc_net(net);
1118 struct tipc_node *n;
1119 bool preliminary;
1120 u32 sugg_addr;
1121
1122 /* Suggest new address if some other peer is using this one */
1123 n = tipc_node_find(net, addr);
1124 if (n) {
1125 if (!memcmp(n->peer_id, id, NODE_ID_LEN))
1126 addr = 0;
1127 tipc_node_put(n);
1128 if (!addr)
1129 return 0;
1130 return tipc_node_suggest_addr(net, addr);
1131 }
1132
1133 /* Suggest previously used address if peer is known */
1134 n = tipc_node_find_by_id(net, id);
1135 if (n) {
1136 sugg_addr = n->addr;
1137 preliminary = n->preliminary;
1138 tipc_node_put(n);
1139 if (!preliminary)
1140 return sugg_addr;
1141 }
1142
1143 /* Even this node may be in conflict */
1144 if (tn->trial_addr == addr)
1145 return tipc_node_suggest_addr(net, addr);
1146
1147 return 0;
1148}
1149
1150void tipc_node_check_dest(struct net *net, u32 addr,
1151 u8 *peer_id, struct tipc_bearer *b,
1152 u16 capabilities, u32 signature, u32 hash_mixes,
1153 struct tipc_media_addr *maddr,
1154 bool *respond, bool *dupl_addr)
1155{
1156 struct tipc_node *n;
1157 struct tipc_link *l, *snd_l;
1158 struct tipc_link_entry *le;
1159 bool addr_match = false;
1160 bool sign_match = false;
1161 bool link_up = false;
1162 bool accept_addr = false;
1163 bool reset = true;
1164 char *if_name;
1165 unsigned long intv;
1166 u16 session;
1167
1168 *dupl_addr = false;
1169 *respond = false;
1170
1171 n = tipc_node_create(net, addr, peer_id, capabilities, hash_mixes,
1172 false);
1173 if (!n)
1174 return;
1175
1176 tipc_node_write_lock(n);
1177 if (unlikely(!n->bc_entry.link)) {
1178 snd_l = tipc_bc_sndlink(net);
1179 if (!tipc_link_bc_create(net, tipc_own_addr(net),
1180 addr, peer_id, U16_MAX,
1181 tipc_link_min_win(snd_l),
1182 tipc_link_max_win(snd_l),
1183 n->capabilities,
1184 &n->bc_entry.inputq1,
1185 &n->bc_entry.namedq, snd_l,
1186 &n->bc_entry.link)) {
1187 pr_warn("Broadcast rcv link creation failed, no mem\n");
1188 tipc_node_write_unlock_fast(n);
1189 tipc_node_put(n);
1190 return;
1191 }
1192 }
1193
1194 le = &n->links[b->identity];
1195
1196 /* Prepare to validate requesting node's signature and media address */
1197 l = le->link;
1198 link_up = l && tipc_link_is_up(l);
1199 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
1200 sign_match = (signature == n->signature);
1201
1202 /* These three flags give us eight permutations: */
1203
1204 if (sign_match && addr_match && link_up) {
1205 /* All is fine. Do nothing. */
1206 reset = false;
1207 /* Peer node is not a container/local namespace */
1208 if (!n->peer_hash_mix)
1209 n->peer_hash_mix = hash_mixes;
1210 } else if (sign_match && addr_match && !link_up) {
1211 /* Respond. The link will come up in due time */
1212 *respond = true;
1213 } else if (sign_match && !addr_match && link_up) {
1214 /* Peer has changed i/f address without rebooting.
1215 * If so, the link will reset soon, and the next
1216 * discovery will be accepted. So we can ignore it.
1217 * It may also be a cloned or malicious peer having
1218 * chosen the same node address and signature as an
1219 * existing one.
1220 * Ignore requests until the link goes down, if ever.
1221 */
1222 *dupl_addr = true;
1223 } else if (sign_match && !addr_match && !link_up) {
1224 /* Peer link has changed i/f address without rebooting.
1225 * It may also be a cloned or malicious peer; we can't
1226 * distinguish between the two.
1227 * The signature is correct, so we must accept.
1228 */
1229 accept_addr = true;
1230 *respond = true;
1231 } else if (!sign_match && addr_match && link_up) {
1232 /* Peer node rebooted. Two possibilities:
1233 * - Delayed re-discovery; this link endpoint has already
1234 * reset and re-established contact with the peer, before
1235 * receiving a discovery message from that node.
1236 * (The peer happened to receive one from this node first).
1237 * - The peer came back so fast that our side has not
1238 * discovered it yet. Probing from this side will soon
1239 * reset the link, since there can be no working link
1240 * endpoint at the peer end, and the link will re-establish.
1241 * Accept the signature, since it comes from a known peer.
1242 */
1243 n->signature = signature;
1244 } else if (!sign_match && addr_match && !link_up) {
1245 /* The peer node has rebooted.
1246 * Accept signature, since it is a known peer.
1247 */
1248 n->signature = signature;
1249 *respond = true;
1250 } else if (!sign_match && !addr_match && link_up) {
1251 /* Peer rebooted with new address, or a new/duplicate peer.
1252 * Ignore until the link goes down, if ever.
1253 */
1254 *dupl_addr = true;
1255 } else if (!sign_match && !addr_match && !link_up) {
1256 /* Peer rebooted with new address, or it is a new peer.
1257 * Accept signature and address.
1258 */
1259 n->signature = signature;
1260 accept_addr = true;
1261 *respond = true;
1262 }
1263
1264 if (!accept_addr)
1265 goto exit;
1266
1267 /* Now create new link if not already existing */
1268 if (!l) {
1269 if (n->link_cnt == 2)
1270 goto exit;
1271
1272 if_name = strchr(b->name, ':') + 1;
1273 get_random_bytes(&session, sizeof(u16));
1274 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
1275 b->net_plane, b->mtu, b->priority,
1276 b->min_win, b->max_win, session,
1277 tipc_own_addr(net), addr, peer_id,
1278 n->capabilities,
1279 tipc_bc_sndlink(n->net), n->bc_entry.link,
1280 &le->inputq,
1281 &n->bc_entry.namedq, &l)) {
1282 *respond = false;
1283 goto exit;
1284 }
1285 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!");
1286 tipc_link_reset(l);
1287 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1288 if (n->state == NODE_FAILINGOVER)
1289 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1290 le->link = l;
1291 n->link_cnt++;
1292 tipc_node_calculate_timer(n, l);
1293 if (n->link_cnt == 1) {
1294 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
1295 if (!mod_timer(&n->timer, intv))
1296 tipc_node_get(n);
1297 }
1298 }
1299 memcpy(&le->maddr, maddr, sizeof(*maddr));
1300exit:
1301 tipc_node_write_unlock(n);
1302 if (reset && l && !tipc_link_is_reset(l))
1303 tipc_node_link_down(n, b->identity, false);
1304 tipc_node_put(n);
1305}
1306
1307void tipc_node_delete_links(struct net *net, int bearer_id)
1308{
1309 struct tipc_net *tn = net_generic(net, tipc_net_id);
1310 struct tipc_node *n;
1311
1312 rcu_read_lock();
1313 list_for_each_entry_rcu(n, &tn->node_list, list) {
1314 tipc_node_link_down(n, bearer_id, true);
1315 }
1316 rcu_read_unlock();
1317}
1318
1319static void tipc_node_reset_links(struct tipc_node *n)
1320{
1321 int i;
1322
1323 pr_warn("Resetting all links to %x\n", n->addr);
1324
1325 trace_tipc_node_reset_links(n, true, " ");
1326 for (i = 0; i < MAX_BEARERS; i++) {
1327 tipc_node_link_down(n, i, false);
1328 }
1329}
1330
1331/* tipc_node_fsm_evt - node finite state machine
1332 * Determines when contact is allowed with peer node
1333 */
1334static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
1335{
1336 int state = n->state;
1337
1338 switch (state) {
1339 case SELF_DOWN_PEER_DOWN:
1340 switch (evt) {
1341 case SELF_ESTABL_CONTACT_EVT:
1342 state = SELF_UP_PEER_COMING;
1343 break;
1344 case PEER_ESTABL_CONTACT_EVT:
1345 state = SELF_COMING_PEER_UP;
1346 break;
1347 case SELF_LOST_CONTACT_EVT:
1348 case PEER_LOST_CONTACT_EVT:
1349 break;
1350 case NODE_SYNCH_END_EVT:
1351 case NODE_SYNCH_BEGIN_EVT:
1352 case NODE_FAILOVER_BEGIN_EVT:
1353 case NODE_FAILOVER_END_EVT:
1354 default:
1355 goto illegal_evt;
1356 }
1357 break;
1358 case SELF_UP_PEER_UP:
1359 switch (evt) {
1360 case SELF_LOST_CONTACT_EVT:
1361 state = SELF_DOWN_PEER_LEAVING;
1362 break;
1363 case PEER_LOST_CONTACT_EVT:
1364 state = SELF_LEAVING_PEER_DOWN;
1365 break;
1366 case NODE_SYNCH_BEGIN_EVT:
1367 state = NODE_SYNCHING;
1368 break;
1369 case NODE_FAILOVER_BEGIN_EVT:
1370 state = NODE_FAILINGOVER;
1371 break;
1372 case SELF_ESTABL_CONTACT_EVT:
1373 case PEER_ESTABL_CONTACT_EVT:
1374 case NODE_SYNCH_END_EVT:
1375 case NODE_FAILOVER_END_EVT:
1376 break;
1377 default:
1378 goto illegal_evt;
1379 }
1380 break;
1381 case SELF_DOWN_PEER_LEAVING:
1382 switch (evt) {
1383 case PEER_LOST_CONTACT_EVT:
1384 state = SELF_DOWN_PEER_DOWN;
1385 break;
1386 case SELF_ESTABL_CONTACT_EVT:
1387 case PEER_ESTABL_CONTACT_EVT:
1388 case SELF_LOST_CONTACT_EVT:
1389 break;
1390 case NODE_SYNCH_END_EVT:
1391 case NODE_SYNCH_BEGIN_EVT:
1392 case NODE_FAILOVER_BEGIN_EVT:
1393 case NODE_FAILOVER_END_EVT:
1394 default:
1395 goto illegal_evt;
1396 }
1397 break;
1398 case SELF_UP_PEER_COMING:
1399 switch (evt) {
1400 case PEER_ESTABL_CONTACT_EVT:
1401 state = SELF_UP_PEER_UP;
1402 break;
1403 case SELF_LOST_CONTACT_EVT:
1404 state = SELF_DOWN_PEER_DOWN;
1405 break;
1406 case SELF_ESTABL_CONTACT_EVT:
1407 case PEER_LOST_CONTACT_EVT:
1408 case NODE_SYNCH_END_EVT:
1409 case NODE_FAILOVER_BEGIN_EVT:
1410 break;
1411 case NODE_SYNCH_BEGIN_EVT:
1412 case NODE_FAILOVER_END_EVT:
1413 default:
1414 goto illegal_evt;
1415 }
1416 break;
1417 case SELF_COMING_PEER_UP:
1418 switch (evt) {
1419 case SELF_ESTABL_CONTACT_EVT:
1420 state = SELF_UP_PEER_UP;
1421 break;
1422 case PEER_LOST_CONTACT_EVT:
1423 state = SELF_DOWN_PEER_DOWN;
1424 break;
1425 case SELF_LOST_CONTACT_EVT:
1426 case PEER_ESTABL_CONTACT_EVT:
1427 break;
1428 case NODE_SYNCH_END_EVT:
1429 case NODE_SYNCH_BEGIN_EVT:
1430 case NODE_FAILOVER_BEGIN_EVT:
1431 case NODE_FAILOVER_END_EVT:
1432 default:
1433 goto illegal_evt;
1434 }
1435 break;
1436 case SELF_LEAVING_PEER_DOWN:
1437 switch (evt) {
1438 case SELF_LOST_CONTACT_EVT:
1439 state = SELF_DOWN_PEER_DOWN;
1440 break;
1441 case SELF_ESTABL_CONTACT_EVT:
1442 case PEER_ESTABL_CONTACT_EVT:
1443 case PEER_LOST_CONTACT_EVT:
1444 break;
1445 case NODE_SYNCH_END_EVT:
1446 case NODE_SYNCH_BEGIN_EVT:
1447 case NODE_FAILOVER_BEGIN_EVT:
1448 case NODE_FAILOVER_END_EVT:
1449 default:
1450 goto illegal_evt;
1451 }
1452 break;
1453 case NODE_FAILINGOVER:
1454 switch (evt) {
1455 case SELF_LOST_CONTACT_EVT:
1456 state = SELF_DOWN_PEER_LEAVING;
1457 break;
1458 case PEER_LOST_CONTACT_EVT:
1459 state = SELF_LEAVING_PEER_DOWN;
1460 break;
1461 case NODE_FAILOVER_END_EVT:
1462 state = SELF_UP_PEER_UP;
1463 break;
1464 case NODE_FAILOVER_BEGIN_EVT:
1465 case SELF_ESTABL_CONTACT_EVT:
1466 case PEER_ESTABL_CONTACT_EVT:
1467 break;
1468 case NODE_SYNCH_BEGIN_EVT:
1469 case NODE_SYNCH_END_EVT:
1470 default:
1471 goto illegal_evt;
1472 }
1473 break;
1474 case NODE_SYNCHING:
1475 switch (evt) {
1476 case SELF_LOST_CONTACT_EVT:
1477 state = SELF_DOWN_PEER_LEAVING;
1478 break;
1479 case PEER_LOST_CONTACT_EVT:
1480 state = SELF_LEAVING_PEER_DOWN;
1481 break;
1482 case NODE_SYNCH_END_EVT:
1483 state = SELF_UP_PEER_UP;
1484 break;
1485 case NODE_FAILOVER_BEGIN_EVT:
1486 state = NODE_FAILINGOVER;
1487 break;
1488 case NODE_SYNCH_BEGIN_EVT:
1489 case SELF_ESTABL_CONTACT_EVT:
1490 case PEER_ESTABL_CONTACT_EVT:
1491 break;
1492 case NODE_FAILOVER_END_EVT:
1493 default:
1494 goto illegal_evt;
1495 }
1496 break;
1497 default:
1498 pr_err("Unknown node fsm state %x\n", state);
1499 break;
1500 }
1501 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1502 n->state = state;
1503 return;
1504
1505illegal_evt:
1506 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1507 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1508}
1509
1510static void node_lost_contact(struct tipc_node *n,
1511 struct sk_buff_head *inputq)
1512{
1513 struct tipc_sock_conn *conn, *safe;
1514 struct tipc_link *l;
1515 struct list_head *conns = &n->conn_sks;
1516 struct sk_buff *skb;
1517 uint i;
1518
1519 pr_debug("Lost contact with %x\n", n->addr);
1520 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
1521 trace_tipc_node_lost_contact(n, true, " ");
1522
1523 /* Clean up broadcast state */
1524 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1525 skb_queue_purge(&n->bc_entry.namedq);
1526
1527 /* Abort any ongoing link failover */
1528 for (i = 0; i < MAX_BEARERS; i++) {
1529 l = n->links[i].link;
1530 if (l)
1531 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1532 }
1533
1534 /* Notify publications from this node */
1535 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1536 n->peer_net = NULL;
1537 n->peer_hash_mix = 0;
1538 /* Notify sockets connected to node */
1539 list_for_each_entry_safe(conn, safe, conns, list) {
1540 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1541 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1542 conn->peer_node, conn->port,
1543 conn->peer_port, TIPC_ERR_NO_NODE);
1544 if (likely(skb))
1545 skb_queue_tail(inputq, skb);
1546 list_del(&conn->list);
1547 kfree(conn);
1548 }
1549}
1550
1551/**
1552 * tipc_node_get_linkname - get the name of a link
1553 *
1554 * @net: the applicable net namespace
1555 * @bearer_id: id of the bearer
1556 * @addr: peer node address
1557 * @linkname: link name output buffer
1558 * @len: size of @linkname output buffer
1559 *
1560 * Return: 0 on success
1561 */
1562int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1563 char *linkname, size_t len)
1564{
1565 struct tipc_link *link;
1566 int err = -EINVAL;
1567 struct tipc_node *node = tipc_node_find(net, addr);
1568
1569 if (!node)
1570 return err;
1571
1572 if (bearer_id >= MAX_BEARERS)
1573 goto exit;
1574
1575 tipc_node_read_lock(node);
1576 link = node->links[bearer_id].link;
1577 if (link) {
1578 strncpy(linkname, tipc_link_name(link), len);
1579 err = 0;
1580 }
1581 tipc_node_read_unlock(node);
1582exit:
1583 tipc_node_put(node);
1584 return err;
1585}
1586
1587/* Caller should hold node lock for the passed node */
1588static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1589{
1590 void *hdr;
1591 struct nlattr *attrs;
1592
1593 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1594 NLM_F_MULTI, TIPC_NL_NODE_GET);
1595 if (!hdr)
1596 return -EMSGSIZE;
1597
1598 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NODE);
1599 if (!attrs)
1600 goto msg_full;
1601
1602 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1603 goto attr_msg_full;
1604 if (node_is_up(node))
1605 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1606 goto attr_msg_full;
1607
1608 nla_nest_end(msg->skb, attrs);
1609 genlmsg_end(msg->skb, hdr);
1610
1611 return 0;
1612
1613attr_msg_full:
1614 nla_nest_cancel(msg->skb, attrs);
1615msg_full:
1616 genlmsg_cancel(msg->skb, hdr);
1617
1618 return -EMSGSIZE;
1619}
1620
1621static void tipc_lxc_xmit(struct net *peer_net, struct sk_buff_head *list)
1622{
1623 struct tipc_msg *hdr = buf_msg(skb_peek(list));
1624 struct sk_buff_head inputq;
1625
1626 switch (msg_user(hdr)) {
1627 case TIPC_LOW_IMPORTANCE:
1628 case TIPC_MEDIUM_IMPORTANCE:
1629 case TIPC_HIGH_IMPORTANCE:
1630 case TIPC_CRITICAL_IMPORTANCE:
1631 if (msg_connected(hdr) || msg_named(hdr) ||
1632 msg_direct(hdr)) {
1633 tipc_loopback_trace(peer_net, list);
1634 spin_lock_init(&list->lock);
1635 tipc_sk_rcv(peer_net, list);
1636 return;
1637 }
1638 if (msg_mcast(hdr)) {
1639 tipc_loopback_trace(peer_net, list);
1640 skb_queue_head_init(&inputq);
1641 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1642 __skb_queue_purge(list);
1643 skb_queue_purge(&inputq);
1644 return;
1645 }
1646 return;
1647 case MSG_FRAGMENTER:
1648 if (tipc_msg_assemble(list)) {
1649 tipc_loopback_trace(peer_net, list);
1650 skb_queue_head_init(&inputq);
1651 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1652 __skb_queue_purge(list);
1653 skb_queue_purge(&inputq);
1654 }
1655 return;
1656 case GROUP_PROTOCOL:
1657 case CONN_MANAGER:
1658 tipc_loopback_trace(peer_net, list);
1659 spin_lock_init(&list->lock);
1660 tipc_sk_rcv(peer_net, list);
1661 return;
1662 case LINK_PROTOCOL:
1663 case NAME_DISTRIBUTOR:
1664 case TUNNEL_PROTOCOL:
1665 case BCAST_PROTOCOL:
1666 return;
1667 default:
1668 return;
1669 }
1670}
1671
1672/**
1673 * tipc_node_xmit() - general link level function for message sending
1674 * @net: the applicable net namespace
1675 * @list: chain of buffers containing message
1676 * @dnode: address of destination node
1677 * @selector: a number used for deterministic link selection
1678 * Consumes the buffer chain.
1679 * Return: 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1680 */
1681int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1682 u32 dnode, int selector)
1683{
1684 struct tipc_link_entry *le = NULL;
1685 struct tipc_node *n;
1686 struct sk_buff_head xmitq;
1687 bool node_up = false;
1688 int bearer_id;
1689 int rc;
1690
1691 if (in_own_node(net, dnode)) {
1692 tipc_loopback_trace(net, list);
1693 spin_lock_init(&list->lock);
1694 tipc_sk_rcv(net, list);
1695 return 0;
1696 }
1697
1698 n = tipc_node_find(net, dnode);
1699 if (unlikely(!n)) {
1700 __skb_queue_purge(list);
1701 return -EHOSTUNREACH;
1702 }
1703
1704 tipc_node_read_lock(n);
1705 node_up = node_is_up(n);
1706 if (node_up && n->peer_net && check_net(n->peer_net)) {
1707 /* xmit inner linux container */
1708 tipc_lxc_xmit(n->peer_net, list);
1709 if (likely(skb_queue_empty(list))) {
1710 tipc_node_read_unlock(n);
1711 tipc_node_put(n);
1712 return 0;
1713 }
1714 }
1715
1716 bearer_id = n->active_links[selector & 1];
1717 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1718 tipc_node_read_unlock(n);
1719 tipc_node_put(n);
1720 __skb_queue_purge(list);
1721 return -EHOSTUNREACH;
1722 }
1723
1724 __skb_queue_head_init(&xmitq);
1725 le = &n->links[bearer_id];
1726 spin_lock_bh(&le->lock);
1727 rc = tipc_link_xmit(le->link, list, &xmitq);
1728 spin_unlock_bh(&le->lock);
1729 tipc_node_read_unlock(n);
1730
1731 if (unlikely(rc == -ENOBUFS))
1732 tipc_node_link_down(n, bearer_id, false);
1733 else
1734 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1735
1736 tipc_node_put(n);
1737
1738 return rc;
1739}
1740
1741/* tipc_node_xmit_skb(): send single buffer to destination
1742 * Buffers sent via this function are generally TIPC_SYSTEM_IMPORTANCE
1743 * messages, which will not be rejected
1744 * The only exception is datagram messages rerouted after secondary
1745 * lookup, which are rare and safe to dispose of anyway.
1746 */
1747int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1748 u32 selector)
1749{
1750 struct sk_buff_head head;
1751
1752 __skb_queue_head_init(&head);
1753 __skb_queue_tail(&head, skb);
1754 tipc_node_xmit(net, &head, dnode, selector);
1755 return 0;
1756}
1757
1758/* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1759 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1760 */
1761int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1762{
1763 struct sk_buff *skb;
1764 u32 selector, dnode;
1765
1766 while ((skb = __skb_dequeue(xmitq))) {
1767 selector = msg_origport(buf_msg(skb));
1768 dnode = msg_destnode(buf_msg(skb));
1769 tipc_node_xmit_skb(net, skb, dnode, selector);
1770 }
1771 return 0;
1772}
1773
1774void tipc_node_broadcast(struct net *net, struct sk_buff *skb, int rc_dests)
1775{
1776 struct sk_buff_head xmitq;
1777 struct sk_buff *txskb;
1778 struct tipc_node *n;
1779 u16 dummy;
1780 u32 dst;
1781
1782 /* Use broadcast if all nodes support it */
1783 if (!rc_dests && tipc_bcast_get_mode(net) != BCLINK_MODE_RCAST) {
1784 __skb_queue_head_init(&xmitq);
1785 __skb_queue_tail(&xmitq, skb);
1786 tipc_bcast_xmit(net, &xmitq, &dummy);
1787 return;
1788 }
1789
1790 /* Otherwise use legacy replicast method */
1791 rcu_read_lock();
1792 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1793 dst = n->addr;
1794 if (in_own_node(net, dst))
1795 continue;
1796 if (!node_is_up(n))
1797 continue;
1798 txskb = pskb_copy(skb, GFP_ATOMIC);
1799 if (!txskb)
1800 break;
1801 msg_set_destnode(buf_msg(txskb), dst);
1802 tipc_node_xmit_skb(net, txskb, dst, 0);
1803 }
1804 rcu_read_unlock();
1805 kfree_skb(skb);
1806}
1807
1808static void tipc_node_mcast_rcv(struct tipc_node *n)
1809{
1810 struct tipc_bclink_entry *be = &n->bc_entry;
1811
1812 /* 'arrvq' is under inputq2's lock protection */
1813 spin_lock_bh(&be->inputq2.lock);
1814 spin_lock_bh(&be->inputq1.lock);
1815 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1816 spin_unlock_bh(&be->inputq1.lock);
1817 spin_unlock_bh(&be->inputq2.lock);
1818 tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1819}
1820
1821static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1822 int bearer_id, struct sk_buff_head *xmitq)
1823{
1824 struct tipc_link *ucl;
1825 int rc;
1826
1827 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr, xmitq);
1828
1829 if (rc & TIPC_LINK_DOWN_EVT) {
1830 tipc_node_reset_links(n);
1831 return;
1832 }
1833
1834 if (!(rc & TIPC_LINK_SND_STATE))
1835 return;
1836
1837 /* If probe message, a STATE response will be sent anyway */
1838 if (msg_probe(hdr))
1839 return;
1840
1841 /* Produce a STATE message carrying broadcast NACK */
1842 tipc_node_read_lock(n);
1843 ucl = n->links[bearer_id].link;
1844 if (ucl)
1845 tipc_link_build_state_msg(ucl, xmitq);
1846 tipc_node_read_unlock(n);
1847}
1848
1849/**
1850 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1851 * @net: the applicable net namespace
1852 * @skb: TIPC packet
1853 * @bearer_id: id of bearer message arrived on
1854 *
1855 * Invoked with no locks held.
1856 */
1857static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1858{
1859 int rc;
1860 struct sk_buff_head xmitq;
1861 struct tipc_bclink_entry *be;
1862 struct tipc_link_entry *le;
1863 struct tipc_msg *hdr = buf_msg(skb);
1864 int usr = msg_user(hdr);
1865 u32 dnode = msg_destnode(hdr);
1866 struct tipc_node *n;
1867
1868 __skb_queue_head_init(&xmitq);
1869
1870 /* If NACK for other node, let rcv link for that node peek into it */
1871 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1872 n = tipc_node_find(net, dnode);
1873 else
1874 n = tipc_node_find(net, msg_prevnode(hdr));
1875 if (!n) {
1876 kfree_skb(skb);
1877 return;
1878 }
1879 be = &n->bc_entry;
1880 le = &n->links[bearer_id];
1881
1882 rc = tipc_bcast_rcv(net, be->link, skb);
1883
1884 /* Broadcast ACKs are sent on a unicast link */
1885 if (rc & TIPC_LINK_SND_STATE) {
1886 tipc_node_read_lock(n);
1887 tipc_link_build_state_msg(le->link, &xmitq);
1888 tipc_node_read_unlock(n);
1889 }
1890
1891 if (!skb_queue_empty(&xmitq))
1892 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1893
1894 if (!skb_queue_empty(&be->inputq1))
1895 tipc_node_mcast_rcv(n);
1896
1897 /* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
1898 if (!skb_queue_empty(&n->bc_entry.namedq))
1899 tipc_named_rcv(net, &n->bc_entry.namedq,
1900 &n->bc_entry.named_rcv_nxt,
1901 &n->bc_entry.named_open);
1902
1903 /* If reassembly or retransmission failure => reset all links to peer */
1904 if (rc & TIPC_LINK_DOWN_EVT)
1905 tipc_node_reset_links(n);
1906
1907 tipc_node_put(n);
1908}
1909
1910/**
1911 * tipc_node_check_state - check and if necessary update node state
1912 * @n: target tipc_node
1913 * @skb: TIPC packet
1914 * @bearer_id: identity of bearer delivering the packet
1915 * @xmitq: queue for messages to be xmited on
1916 * Return: true if state and msg are ok, otherwise false
1917 */
1918static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1919 int bearer_id, struct sk_buff_head *xmitq)
1920{
1921 struct tipc_msg *hdr = buf_msg(skb);
1922 int usr = msg_user(hdr);
1923 int mtyp = msg_type(hdr);
1924 u16 oseqno = msg_seqno(hdr);
1925 u16 exp_pkts = msg_msgcnt(hdr);
1926 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1927 int state = n->state;
1928 struct tipc_link *l, *tnl, *pl = NULL;
1929 struct tipc_media_addr *maddr;
1930 int pb_id;
1931
1932 if (trace_tipc_node_check_state_enabled()) {
1933 trace_tipc_skb_dump(skb, false, "skb for node state check");
1934 trace_tipc_node_check_state(n, true, " ");
1935 }
1936 l = n->links[bearer_id].link;
1937 if (!l)
1938 return false;
1939 rcv_nxt = tipc_link_rcv_nxt(l);
1940
1941
1942 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1943 return true;
1944
1945 /* Find parallel link, if any */
1946 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1947 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1948 pl = n->links[pb_id].link;
1949 break;
1950 }
1951 }
1952
1953 if (!tipc_link_validate_msg(l, hdr)) {
1954 trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
1955 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
1956 return false;
1957 }
1958
1959 /* Check and update node accesibility if applicable */
1960 if (state == SELF_UP_PEER_COMING) {
1961 if (!tipc_link_is_up(l))
1962 return true;
1963 if (!msg_peer_link_is_up(hdr))
1964 return true;
1965 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1966 }
1967
1968 if (state == SELF_DOWN_PEER_LEAVING) {
1969 if (msg_peer_node_is_up(hdr))
1970 return false;
1971 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1972 return true;
1973 }
1974
1975 if (state == SELF_LEAVING_PEER_DOWN)
1976 return false;
1977
1978 /* Ignore duplicate packets */
1979 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1980 return true;
1981
1982 /* Initiate or update failover mode if applicable */
1983 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1984 syncpt = oseqno + exp_pkts - 1;
1985 if (pl && !tipc_link_is_reset(pl)) {
1986 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1987 trace_tipc_node_link_down(n, true,
1988 "node link down <- failover!");
1989 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
1990 tipc_link_inputq(l));
1991 }
1992
1993 /* If parallel link was already down, and this happened before
1994 * the tunnel link came up, node failover was never started.
1995 * Ensure that a FAILOVER_MSG is sent to get peer out of
1996 * NODE_FAILINGOVER state, also this node must accept
1997 * TUNNEL_MSGs from peer.
1998 */
1999 if (n->state != NODE_FAILINGOVER)
2000 tipc_node_link_failover(n, pl, l, xmitq);
2001
2002 /* If pkts arrive out of order, use lowest calculated syncpt */
2003 if (less(syncpt, n->sync_point))
2004 n->sync_point = syncpt;
2005 }
2006
2007 /* Open parallel link when tunnel link reaches synch point */
2008 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
2009 if (!more(rcv_nxt, n->sync_point))
2010 return true;
2011 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
2012 if (pl)
2013 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
2014 return true;
2015 }
2016
2017 /* No syncing needed if only one link */
2018 if (!pl || !tipc_link_is_up(pl))
2019 return true;
2020
2021 /* Initiate synch mode if applicable */
2022 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
2023 if (n->capabilities & TIPC_TUNNEL_ENHANCED)
2024 syncpt = msg_syncpt(hdr);
2025 else
2026 syncpt = msg_seqno(msg_inner_hdr(hdr)) + exp_pkts - 1;
2027 if (!tipc_link_is_up(l))
2028 __tipc_node_link_up(n, bearer_id, xmitq);
2029 if (n->state == SELF_UP_PEER_UP) {
2030 n->sync_point = syncpt;
2031 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
2032 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
2033 }
2034 }
2035
2036 /* Open tunnel link when parallel link reaches synch point */
2037 if (n->state == NODE_SYNCHING) {
2038 if (tipc_link_is_synching(l)) {
2039 tnl = l;
2040 } else {
2041 tnl = pl;
2042 pl = l;
2043 }
2044 inputq_len = skb_queue_len(tipc_link_inputq(pl));
2045 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
2046 if (more(dlv_nxt, n->sync_point)) {
2047 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
2048 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
2049 return true;
2050 }
2051 if (l == pl)
2052 return true;
2053 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
2054 return true;
2055 if (usr == LINK_PROTOCOL)
2056 return true;
2057 return false;
2058 }
2059 return true;
2060}
2061
2062/**
2063 * tipc_rcv - process TIPC packets/messages arriving from off-node
2064 * @net: the applicable net namespace
2065 * @skb: TIPC packet
2066 * @b: pointer to bearer message arrived on
2067 *
2068 * Invoked with no locks held. Bearer pointer must point to a valid bearer
2069 * structure (i.e. cannot be NULL), but bearer can be inactive.
2070 */
2071void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
2072{
2073 struct sk_buff_head xmitq;
2074 struct tipc_link_entry *le;
2075 struct tipc_msg *hdr;
2076 struct tipc_node *n;
2077 int bearer_id = b->identity;
2078 u32 self = tipc_own_addr(net);
2079 int usr, rc = 0;
2080 u16 bc_ack;
2081#ifdef CONFIG_TIPC_CRYPTO
2082 struct tipc_ehdr *ehdr;
2083
2084 /* Check if message must be decrypted first */
2085 if (TIPC_SKB_CB(skb)->decrypted || !tipc_ehdr_validate(skb))
2086 goto rcv;
2087
2088 ehdr = (struct tipc_ehdr *)skb->data;
2089 if (likely(ehdr->user != LINK_CONFIG)) {
2090 n = tipc_node_find(net, ntohl(ehdr->addr));
2091 if (unlikely(!n))
2092 goto discard;
2093 } else {
2094 n = tipc_node_find_by_id(net, ehdr->id);
2095 }
2096 tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b);
2097 if (!skb)
2098 return;
2099
2100rcv:
2101#endif
2102 /* Ensure message is well-formed before touching the header */
2103 if (unlikely(!tipc_msg_validate(&skb)))
2104 goto discard;
2105 __skb_queue_head_init(&xmitq);
2106 hdr = buf_msg(skb);
2107 usr = msg_user(hdr);
2108 bc_ack = msg_bcast_ack(hdr);
2109
2110 /* Handle arrival of discovery or broadcast packet */
2111 if (unlikely(msg_non_seq(hdr))) {
2112 if (unlikely(usr == LINK_CONFIG))
2113 return tipc_disc_rcv(net, skb, b);
2114 else
2115 return tipc_node_bc_rcv(net, skb, bearer_id);
2116 }
2117
2118 /* Discard unicast link messages destined for another node */
2119 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
2120 goto discard;
2121
2122 /* Locate neighboring node that sent packet */
2123 n = tipc_node_find(net, msg_prevnode(hdr));
2124 if (unlikely(!n))
2125 goto discard;
2126 le = &n->links[bearer_id];
2127
2128 /* Ensure broadcast reception is in synch with peer's send state */
2129 if (unlikely(usr == LINK_PROTOCOL)) {
2130 if (unlikely(skb_linearize(skb))) {
2131 tipc_node_put(n);
2132 goto discard;
2133 }
2134 hdr = buf_msg(skb);
2135 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
2136 } else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack)) {
2137 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
2138 }
2139
2140 /* Receive packet directly if conditions permit */
2141 tipc_node_read_lock(n);
2142 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
2143 spin_lock_bh(&le->lock);
2144 if (le->link) {
2145 rc = tipc_link_rcv(le->link, skb, &xmitq);
2146 skb = NULL;
2147 }
2148 spin_unlock_bh(&le->lock);
2149 }
2150 tipc_node_read_unlock(n);
2151
2152 /* Check/update node state before receiving */
2153 if (unlikely(skb)) {
2154 if (unlikely(skb_linearize(skb)))
2155 goto out_node_put;
2156 tipc_node_write_lock(n);
2157 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
2158 if (le->link) {
2159 rc = tipc_link_rcv(le->link, skb, &xmitq);
2160 skb = NULL;
2161 }
2162 }
2163 tipc_node_write_unlock(n);
2164 }
2165
2166 if (unlikely(rc & TIPC_LINK_UP_EVT))
2167 tipc_node_link_up(n, bearer_id, &xmitq);
2168
2169 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
2170 tipc_node_link_down(n, bearer_id, false);
2171
2172 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
2173 tipc_named_rcv(net, &n->bc_entry.namedq,
2174 &n->bc_entry.named_rcv_nxt,
2175 &n->bc_entry.named_open);
2176
2177 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
2178 tipc_node_mcast_rcv(n);
2179
2180 if (!skb_queue_empty(&le->inputq))
2181 tipc_sk_rcv(net, &le->inputq);
2182
2183 if (!skb_queue_empty(&xmitq))
2184 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
2185
2186out_node_put:
2187 tipc_node_put(n);
2188discard:
2189 kfree_skb(skb);
2190}
2191
2192void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
2193 int prop)
2194{
2195 struct tipc_net *tn = tipc_net(net);
2196 int bearer_id = b->identity;
2197 struct sk_buff_head xmitq;
2198 struct tipc_link_entry *e;
2199 struct tipc_node *n;
2200
2201 __skb_queue_head_init(&xmitq);
2202
2203 rcu_read_lock();
2204
2205 list_for_each_entry_rcu(n, &tn->node_list, list) {
2206 tipc_node_write_lock(n);
2207 e = &n->links[bearer_id];
2208 if (e->link) {
2209 if (prop == TIPC_NLA_PROP_TOL)
2210 tipc_link_set_tolerance(e->link, b->tolerance,
2211 &xmitq);
2212 else if (prop == TIPC_NLA_PROP_MTU)
2213 tipc_link_set_mtu(e->link, b->mtu);
2214
2215 /* Update MTU for node link entry */
2216 e->mtu = tipc_link_mss(e->link);
2217 }
2218
2219 tipc_node_write_unlock(n);
2220 tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
2221 }
2222
2223 rcu_read_unlock();
2224}
2225
2226int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
2227{
2228 struct net *net = sock_net(skb->sk);
2229 struct tipc_net *tn = net_generic(net, tipc_net_id);
2230 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
2231 struct tipc_node *peer, *temp_node;
2232 u8 node_id[NODE_ID_LEN];
2233 u64 *w0 = (u64 *)&node_id[0];
2234 u64 *w1 = (u64 *)&node_id[8];
2235 u32 addr;
2236 int err;
2237
2238 /* We identify the peer by its net */
2239 if (!info->attrs[TIPC_NLA_NET])
2240 return -EINVAL;
2241
2242 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
2243 info->attrs[TIPC_NLA_NET],
2244 tipc_nl_net_policy, info->extack);
2245 if (err)
2246 return err;
2247
2248 /* attrs[TIPC_NLA_NET_NODEID] and attrs[TIPC_NLA_NET_ADDR] are
2249 * mutually exclusive cases
2250 */
2251 if (attrs[TIPC_NLA_NET_ADDR]) {
2252 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
2253 if (!addr)
2254 return -EINVAL;
2255 }
2256
2257 if (attrs[TIPC_NLA_NET_NODEID]) {
2258 if (!attrs[TIPC_NLA_NET_NODEID_W1])
2259 return -EINVAL;
2260 *w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
2261 *w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
2262 addr = hash128to32(node_id);
2263 }
2264
2265 if (in_own_node(net, addr))
2266 return -ENOTSUPP;
2267
2268 spin_lock_bh(&tn->node_list_lock);
2269 peer = tipc_node_find(net, addr);
2270 if (!peer) {
2271 spin_unlock_bh(&tn->node_list_lock);
2272 return -ENXIO;
2273 }
2274
2275 tipc_node_write_lock(peer);
2276 if (peer->state != SELF_DOWN_PEER_DOWN &&
2277 peer->state != SELF_DOWN_PEER_LEAVING) {
2278 tipc_node_write_unlock(peer);
2279 err = -EBUSY;
2280 goto err_out;
2281 }
2282
2283 tipc_node_clear_links(peer);
2284 tipc_node_write_unlock(peer);
2285 tipc_node_delete(peer);
2286
2287 /* Calculate cluster capabilities */
2288 tn->capabilities = TIPC_NODE_CAPABILITIES;
2289 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
2290 tn->capabilities &= temp_node->capabilities;
2291 }
2292 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
2293 err = 0;
2294err_out:
2295 tipc_node_put(peer);
2296 spin_unlock_bh(&tn->node_list_lock);
2297
2298 return err;
2299}
2300
2301int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
2302{
2303 int err;
2304 struct net *net = sock_net(skb->sk);
2305 struct tipc_net *tn = net_generic(net, tipc_net_id);
2306 int done = cb->args[0];
2307 int last_addr = cb->args[1];
2308 struct tipc_node *node;
2309 struct tipc_nl_msg msg;
2310
2311 if (done)
2312 return 0;
2313
2314 msg.skb = skb;
2315 msg.portid = NETLINK_CB(cb->skb).portid;
2316 msg.seq = cb->nlh->nlmsg_seq;
2317
2318 rcu_read_lock();
2319 if (last_addr) {
2320 node = tipc_node_find(net, last_addr);
2321 if (!node) {
2322 rcu_read_unlock();
2323 /* We never set seq or call nl_dump_check_consistent()
2324 * this means that setting prev_seq here will cause the
2325 * consistence check to fail in the netlink callback
2326 * handler. Resulting in the NLMSG_DONE message having
2327 * the NLM_F_DUMP_INTR flag set if the node state
2328 * changed while we released the lock.
2329 */
2330 cb->prev_seq = 1;
2331 return -EPIPE;
2332 }
2333 tipc_node_put(node);
2334 }
2335
2336 list_for_each_entry_rcu(node, &tn->node_list, list) {
2337 if (node->preliminary)
2338 continue;
2339 if (last_addr) {
2340 if (node->addr == last_addr)
2341 last_addr = 0;
2342 else
2343 continue;
2344 }
2345
2346 tipc_node_read_lock(node);
2347 err = __tipc_nl_add_node(&msg, node);
2348 if (err) {
2349 last_addr = node->addr;
2350 tipc_node_read_unlock(node);
2351 goto out;
2352 }
2353
2354 tipc_node_read_unlock(node);
2355 }
2356 done = 1;
2357out:
2358 cb->args[0] = done;
2359 cb->args[1] = last_addr;
2360 rcu_read_unlock();
2361
2362 return skb->len;
2363}
2364
2365/* tipc_node_find_by_name - locate owner node of link by link's name
2366 * @net: the applicable net namespace
2367 * @name: pointer to link name string
2368 * @bearer_id: pointer to index in 'node->links' array where the link was found.
2369 *
2370 * Returns pointer to node owning the link, or 0 if no matching link is found.
2371 */
2372static struct tipc_node *tipc_node_find_by_name(struct net *net,
2373 const char *link_name,
2374 unsigned int *bearer_id)
2375{
2376 struct tipc_net *tn = net_generic(net, tipc_net_id);
2377 struct tipc_link *l;
2378 struct tipc_node *n;
2379 struct tipc_node *found_node = NULL;
2380 int i;
2381
2382 *bearer_id = 0;
2383 rcu_read_lock();
2384 list_for_each_entry_rcu(n, &tn->node_list, list) {
2385 tipc_node_read_lock(n);
2386 for (i = 0; i < MAX_BEARERS; i++) {
2387 l = n->links[i].link;
2388 if (l && !strcmp(tipc_link_name(l), link_name)) {
2389 *bearer_id = i;
2390 found_node = n;
2391 break;
2392 }
2393 }
2394 tipc_node_read_unlock(n);
2395 if (found_node)
2396 break;
2397 }
2398 rcu_read_unlock();
2399
2400 return found_node;
2401}
2402
2403int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
2404{
2405 int err;
2406 int res = 0;
2407 int bearer_id;
2408 char *name;
2409 struct tipc_link *link;
2410 struct tipc_node *node;
2411 struct sk_buff_head xmitq;
2412 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2413 struct net *net = sock_net(skb->sk);
2414
2415 __skb_queue_head_init(&xmitq);
2416
2417 if (!info->attrs[TIPC_NLA_LINK])
2418 return -EINVAL;
2419
2420 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2421 info->attrs[TIPC_NLA_LINK],
2422 tipc_nl_link_policy, info->extack);
2423 if (err)
2424 return err;
2425
2426 if (!attrs[TIPC_NLA_LINK_NAME])
2427 return -EINVAL;
2428
2429 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2430
2431 if (strcmp(name, tipc_bclink_name) == 0)
2432 return tipc_nl_bc_link_set(net, attrs);
2433
2434 node = tipc_node_find_by_name(net, name, &bearer_id);
2435 if (!node)
2436 return -EINVAL;
2437
2438 tipc_node_read_lock(node);
2439
2440 link = node->links[bearer_id].link;
2441 if (!link) {
2442 res = -EINVAL;
2443 goto out;
2444 }
2445
2446 if (attrs[TIPC_NLA_LINK_PROP]) {
2447 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2448
2449 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
2450 if (err) {
2451 res = err;
2452 goto out;
2453 }
2454
2455 if (props[TIPC_NLA_PROP_TOL]) {
2456 u32 tol;
2457
2458 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2459 tipc_link_set_tolerance(link, tol, &xmitq);
2460 }
2461 if (props[TIPC_NLA_PROP_PRIO]) {
2462 u32 prio;
2463
2464 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2465 tipc_link_set_prio(link, prio, &xmitq);
2466 }
2467 if (props[TIPC_NLA_PROP_WIN]) {
2468 u32 max_win;
2469
2470 max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2471 tipc_link_set_queue_limits(link,
2472 tipc_link_min_win(link),
2473 max_win);
2474 }
2475 }
2476
2477out:
2478 tipc_node_read_unlock(node);
2479 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr,
2480 NULL);
2481 return res;
2482}
2483
2484int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
2485{
2486 struct net *net = genl_info_net(info);
2487 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2488 struct tipc_nl_msg msg;
2489 char *name;
2490 int err;
2491
2492 msg.portid = info->snd_portid;
2493 msg.seq = info->snd_seq;
2494
2495 if (!info->attrs[TIPC_NLA_LINK])
2496 return -EINVAL;
2497
2498 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2499 info->attrs[TIPC_NLA_LINK],
2500 tipc_nl_link_policy, info->extack);
2501 if (err)
2502 return err;
2503
2504 if (!attrs[TIPC_NLA_LINK_NAME])
2505 return -EINVAL;
2506
2507 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2508
2509 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2510 if (!msg.skb)
2511 return -ENOMEM;
2512
2513 if (strcmp(name, tipc_bclink_name) == 0) {
2514 err = tipc_nl_add_bc_link(net, &msg, tipc_net(net)->bcl);
2515 if (err)
2516 goto err_free;
2517 } else {
2518 int bearer_id;
2519 struct tipc_node *node;
2520 struct tipc_link *link;
2521
2522 node = tipc_node_find_by_name(net, name, &bearer_id);
2523 if (!node) {
2524 err = -EINVAL;
2525 goto err_free;
2526 }
2527
2528 tipc_node_read_lock(node);
2529 link = node->links[bearer_id].link;
2530 if (!link) {
2531 tipc_node_read_unlock(node);
2532 err = -EINVAL;
2533 goto err_free;
2534 }
2535
2536 err = __tipc_nl_add_link(net, &msg, link, 0);
2537 tipc_node_read_unlock(node);
2538 if (err)
2539 goto err_free;
2540 }
2541
2542 return genlmsg_reply(msg.skb, info);
2543
2544err_free:
2545 nlmsg_free(msg.skb);
2546 return err;
2547}
2548
2549int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2550{
2551 int err;
2552 char *link_name;
2553 unsigned int bearer_id;
2554 struct tipc_link *link;
2555 struct tipc_node *node;
2556 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2557 struct net *net = sock_net(skb->sk);
2558 struct tipc_net *tn = tipc_net(net);
2559 struct tipc_link_entry *le;
2560
2561 if (!info->attrs[TIPC_NLA_LINK])
2562 return -EINVAL;
2563
2564 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2565 info->attrs[TIPC_NLA_LINK],
2566 tipc_nl_link_policy, info->extack);
2567 if (err)
2568 return err;
2569
2570 if (!attrs[TIPC_NLA_LINK_NAME])
2571 return -EINVAL;
2572
2573 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2574
2575 err = -EINVAL;
2576 if (!strcmp(link_name, tipc_bclink_name)) {
2577 err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
2578 if (err)
2579 return err;
2580 return 0;
2581 } else if (strstr(link_name, tipc_bclink_name)) {
2582 rcu_read_lock();
2583 list_for_each_entry_rcu(node, &tn->node_list, list) {
2584 tipc_node_read_lock(node);
2585 link = node->bc_entry.link;
2586 if (link && !strcmp(link_name, tipc_link_name(link))) {
2587 err = tipc_bclink_reset_stats(net, link);
2588 tipc_node_read_unlock(node);
2589 break;
2590 }
2591 tipc_node_read_unlock(node);
2592 }
2593 rcu_read_unlock();
2594 return err;
2595 }
2596
2597 node = tipc_node_find_by_name(net, link_name, &bearer_id);
2598 if (!node)
2599 return -EINVAL;
2600
2601 le = &node->links[bearer_id];
2602 tipc_node_read_lock(node);
2603 spin_lock_bh(&le->lock);
2604 link = node->links[bearer_id].link;
2605 if (!link) {
2606 spin_unlock_bh(&le->lock);
2607 tipc_node_read_unlock(node);
2608 return -EINVAL;
2609 }
2610 tipc_link_reset_stats(link);
2611 spin_unlock_bh(&le->lock);
2612 tipc_node_read_unlock(node);
2613 return 0;
2614}
2615
2616/* Caller should hold node lock */
2617static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2618 struct tipc_node *node, u32 *prev_link,
2619 bool bc_link)
2620{
2621 u32 i;
2622 int err;
2623
2624 for (i = *prev_link; i < MAX_BEARERS; i++) {
2625 *prev_link = i;
2626
2627 if (!node->links[i].link)
2628 continue;
2629
2630 err = __tipc_nl_add_link(net, msg,
2631 node->links[i].link, NLM_F_MULTI);
2632 if (err)
2633 return err;
2634 }
2635
2636 if (bc_link) {
2637 *prev_link = i;
2638 err = tipc_nl_add_bc_link(net, msg, node->bc_entry.link);
2639 if (err)
2640 return err;
2641 }
2642
2643 *prev_link = 0;
2644
2645 return 0;
2646}
2647
2648int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2649{
2650 struct net *net = sock_net(skb->sk);
2651 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
2652 struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
2653 struct tipc_net *tn = net_generic(net, tipc_net_id);
2654 struct tipc_node *node;
2655 struct tipc_nl_msg msg;
2656 u32 prev_node = cb->args[0];
2657 u32 prev_link = cb->args[1];
2658 int done = cb->args[2];
2659 bool bc_link = cb->args[3];
2660 int err;
2661
2662 if (done)
2663 return 0;
2664
2665 if (!prev_node) {
2666 /* Check if broadcast-receiver links dumping is needed */
2667 if (attrs && attrs[TIPC_NLA_LINK]) {
2668 err = nla_parse_nested_deprecated(link,
2669 TIPC_NLA_LINK_MAX,
2670 attrs[TIPC_NLA_LINK],
2671 tipc_nl_link_policy,
2672 NULL);
2673 if (unlikely(err))
2674 return err;
2675 if (unlikely(!link[TIPC_NLA_LINK_BROADCAST]))
2676 return -EINVAL;
2677 bc_link = true;
2678 }
2679 }
2680
2681 msg.skb = skb;
2682 msg.portid = NETLINK_CB(cb->skb).portid;
2683 msg.seq = cb->nlh->nlmsg_seq;
2684
2685 rcu_read_lock();
2686 if (prev_node) {
2687 node = tipc_node_find(net, prev_node);
2688 if (!node) {
2689 /* We never set seq or call nl_dump_check_consistent()
2690 * this means that setting prev_seq here will cause the
2691 * consistence check to fail in the netlink callback
2692 * handler. Resulting in the last NLMSG_DONE message
2693 * having the NLM_F_DUMP_INTR flag set.
2694 */
2695 cb->prev_seq = 1;
2696 goto out;
2697 }
2698 tipc_node_put(node);
2699
2700 list_for_each_entry_continue_rcu(node, &tn->node_list,
2701 list) {
2702 tipc_node_read_lock(node);
2703 err = __tipc_nl_add_node_links(net, &msg, node,
2704 &prev_link, bc_link);
2705 tipc_node_read_unlock(node);
2706 if (err)
2707 goto out;
2708
2709 prev_node = node->addr;
2710 }
2711 } else {
2712 err = tipc_nl_add_bc_link(net, &msg, tn->bcl);
2713 if (err)
2714 goto out;
2715
2716 list_for_each_entry_rcu(node, &tn->node_list, list) {
2717 tipc_node_read_lock(node);
2718 err = __tipc_nl_add_node_links(net, &msg, node,
2719 &prev_link, bc_link);
2720 tipc_node_read_unlock(node);
2721 if (err)
2722 goto out;
2723
2724 prev_node = node->addr;
2725 }
2726 }
2727 done = 1;
2728out:
2729 rcu_read_unlock();
2730
2731 cb->args[0] = prev_node;
2732 cb->args[1] = prev_link;
2733 cb->args[2] = done;
2734 cb->args[3] = bc_link;
2735
2736 return skb->len;
2737}
2738
2739int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2740{
2741 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2742 struct net *net = sock_net(skb->sk);
2743 int err;
2744
2745 if (!info->attrs[TIPC_NLA_MON])
2746 return -EINVAL;
2747
2748 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
2749 info->attrs[TIPC_NLA_MON],
2750 tipc_nl_monitor_policy,
2751 info->extack);
2752 if (err)
2753 return err;
2754
2755 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2756 u32 val;
2757
2758 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2759 err = tipc_nl_monitor_set_threshold(net, val);
2760 if (err)
2761 return err;
2762 }
2763
2764 return 0;
2765}
2766
2767static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2768{
2769 struct nlattr *attrs;
2770 void *hdr;
2771 u32 val;
2772
2773 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2774 0, TIPC_NL_MON_GET);
2775 if (!hdr)
2776 return -EMSGSIZE;
2777
2778 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
2779 if (!attrs)
2780 goto msg_full;
2781
2782 val = tipc_nl_monitor_get_threshold(net);
2783
2784 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2785 goto attr_msg_full;
2786
2787 nla_nest_end(msg->skb, attrs);
2788 genlmsg_end(msg->skb, hdr);
2789
2790 return 0;
2791
2792attr_msg_full:
2793 nla_nest_cancel(msg->skb, attrs);
2794msg_full:
2795 genlmsg_cancel(msg->skb, hdr);
2796
2797 return -EMSGSIZE;
2798}
2799
2800int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2801{
2802 struct net *net = sock_net(skb->sk);
2803 struct tipc_nl_msg msg;
2804 int err;
2805
2806 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2807 if (!msg.skb)
2808 return -ENOMEM;
2809 msg.portid = info->snd_portid;
2810 msg.seq = info->snd_seq;
2811
2812 err = __tipc_nl_add_monitor_prop(net, &msg);
2813 if (err) {
2814 nlmsg_free(msg.skb);
2815 return err;
2816 }
2817
2818 return genlmsg_reply(msg.skb, info);
2819}
2820
2821int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2822{
2823 struct net *net = sock_net(skb->sk);
2824 u32 prev_bearer = cb->args[0];
2825 struct tipc_nl_msg msg;
2826 int bearer_id;
2827 int err;
2828
2829 if (prev_bearer == MAX_BEARERS)
2830 return 0;
2831
2832 msg.skb = skb;
2833 msg.portid = NETLINK_CB(cb->skb).portid;
2834 msg.seq = cb->nlh->nlmsg_seq;
2835
2836 rtnl_lock();
2837 for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2838 err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2839 if (err)
2840 break;
2841 }
2842 rtnl_unlock();
2843 cb->args[0] = bearer_id;
2844
2845 return skb->len;
2846}
2847
2848int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2849 struct netlink_callback *cb)
2850{
2851 struct net *net = sock_net(skb->sk);
2852 u32 prev_node = cb->args[1];
2853 u32 bearer_id = cb->args[2];
2854 int done = cb->args[0];
2855 struct tipc_nl_msg msg;
2856 int err;
2857
2858 if (!prev_node) {
2859 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
2860 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2861
2862 if (!attrs[TIPC_NLA_MON])
2863 return -EINVAL;
2864
2865 err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
2866 attrs[TIPC_NLA_MON],
2867 tipc_nl_monitor_policy,
2868 NULL);
2869 if (err)
2870 return err;
2871
2872 if (!mon[TIPC_NLA_MON_REF])
2873 return -EINVAL;
2874
2875 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2876
2877 if (bearer_id >= MAX_BEARERS)
2878 return -EINVAL;
2879 }
2880
2881 if (done)
2882 return 0;
2883
2884 msg.skb = skb;
2885 msg.portid = NETLINK_CB(cb->skb).portid;
2886 msg.seq = cb->nlh->nlmsg_seq;
2887
2888 rtnl_lock();
2889 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2890 if (!err)
2891 done = 1;
2892
2893 rtnl_unlock();
2894 cb->args[0] = done;
2895 cb->args[1] = prev_node;
2896 cb->args[2] = bearer_id;
2897
2898 return skb->len;
2899}
2900
2901#ifdef CONFIG_TIPC_CRYPTO
2902static int tipc_nl_retrieve_key(struct nlattr **attrs,
2903 struct tipc_aead_key **pkey)
2904{
2905 struct nlattr *attr = attrs[TIPC_NLA_NODE_KEY];
2906 struct tipc_aead_key *key;
2907
2908 if (!attr)
2909 return -ENODATA;
2910
2911 if (nla_len(attr) < sizeof(*key))
2912 return -EINVAL;
2913 key = (struct tipc_aead_key *)nla_data(attr);
2914 if (key->keylen > TIPC_AEAD_KEYLEN_MAX ||
2915 nla_len(attr) < tipc_aead_key_size(key))
2916 return -EINVAL;
2917
2918 *pkey = key;
2919 return 0;
2920}
2921
2922static int tipc_nl_retrieve_nodeid(struct nlattr **attrs, u8 **node_id)
2923{
2924 struct nlattr *attr = attrs[TIPC_NLA_NODE_ID];
2925
2926 if (!attr)
2927 return -ENODATA;
2928
2929 if (nla_len(attr) < TIPC_NODEID_LEN)
2930 return -EINVAL;
2931
2932 *node_id = (u8 *)nla_data(attr);
2933 return 0;
2934}
2935
2936static int tipc_nl_retrieve_rekeying(struct nlattr **attrs, u32 *intv)
2937{
2938 struct nlattr *attr = attrs[TIPC_NLA_NODE_REKEYING];
2939
2940 if (!attr)
2941 return -ENODATA;
2942
2943 *intv = nla_get_u32(attr);
2944 return 0;
2945}
2946
2947static int __tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
2948{
2949 struct nlattr *attrs[TIPC_NLA_NODE_MAX + 1];
2950 struct net *net = sock_net(skb->sk);
2951 struct tipc_crypto *tx = tipc_net(net)->crypto_tx, *c = tx;
2952 struct tipc_node *n = NULL;
2953 struct tipc_aead_key *ukey;
2954 bool rekeying = true, master_key = false;
2955 u8 *id, *own_id, mode;
2956 u32 intv = 0;
2957 int rc = 0;
2958
2959 if (!info->attrs[TIPC_NLA_NODE])
2960 return -EINVAL;
2961
2962 rc = nla_parse_nested(attrs, TIPC_NLA_NODE_MAX,
2963 info->attrs[TIPC_NLA_NODE],
2964 tipc_nl_node_policy, info->extack);
2965 if (rc)
2966 return rc;
2967
2968 own_id = tipc_own_id(net);
2969 if (!own_id) {
2970 GENL_SET_ERR_MSG(info, "not found own node identity (set id?)");
2971 return -EPERM;
2972 }
2973
2974 rc = tipc_nl_retrieve_rekeying(attrs, &intv);
2975 if (rc == -ENODATA)
2976 rekeying = false;
2977
2978 rc = tipc_nl_retrieve_key(attrs, &ukey);
2979 if (rc == -ENODATA && rekeying)
2980 goto rekeying;
2981 else if (rc)
2982 return rc;
2983
2984 rc = tipc_aead_key_validate(ukey, info);
2985 if (rc)
2986 return rc;
2987
2988 rc = tipc_nl_retrieve_nodeid(attrs, &id);
2989 switch (rc) {
2990 case -ENODATA:
2991 mode = CLUSTER_KEY;
2992 master_key = !!(attrs[TIPC_NLA_NODE_KEY_MASTER]);
2993 break;
2994 case 0:
2995 mode = PER_NODE_KEY;
2996 if (memcmp(id, own_id, NODE_ID_LEN)) {
2997 n = tipc_node_find_by_id(net, id) ?:
2998 tipc_node_create(net, 0, id, 0xffffu, 0, true);
2999 if (unlikely(!n))
3000 return -ENOMEM;
3001 c = n->crypto_rx;
3002 }
3003 break;
3004 default:
3005 return rc;
3006 }
3007
3008 /* Initiate the TX/RX key */
3009 rc = tipc_crypto_key_init(c, ukey, mode, master_key);
3010 if (n)
3011 tipc_node_put(n);
3012
3013 if (unlikely(rc < 0)) {
3014 GENL_SET_ERR_MSG(info, "unable to initiate or attach new key");
3015 return rc;
3016 } else if (c == tx) {
3017 /* Distribute TX key but not master one */
3018 if (!master_key && tipc_crypto_key_distr(tx, rc, NULL))
3019 GENL_SET_ERR_MSG(info, "failed to replicate new key");
3020rekeying:
3021 /* Schedule TX rekeying if needed */
3022 tipc_crypto_rekeying_sched(tx, rekeying, intv);
3023 }
3024
3025 return 0;
3026}
3027
3028int tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
3029{
3030 int err;
3031
3032 rtnl_lock();
3033 err = __tipc_nl_node_set_key(skb, info);
3034 rtnl_unlock();
3035
3036 return err;
3037}
3038
3039static int __tipc_nl_node_flush_key(struct sk_buff *skb,
3040 struct genl_info *info)
3041{
3042 struct net *net = sock_net(skb->sk);
3043 struct tipc_net *tn = tipc_net(net);
3044 struct tipc_node *n;
3045
3046 tipc_crypto_key_flush(tn->crypto_tx);
3047 rcu_read_lock();
3048 list_for_each_entry_rcu(n, &tn->node_list, list)
3049 tipc_crypto_key_flush(n->crypto_rx);
3050 rcu_read_unlock();
3051
3052 return 0;
3053}
3054
3055int tipc_nl_node_flush_key(struct sk_buff *skb, struct genl_info *info)
3056{
3057 int err;
3058
3059 rtnl_lock();
3060 err = __tipc_nl_node_flush_key(skb, info);
3061 rtnl_unlock();
3062
3063 return err;
3064}
3065#endif
3066
3067/**
3068 * tipc_node_dump - dump TIPC node data
3069 * @n: tipc node to be dumped
3070 * @more: dump more?
3071 * - false: dump only tipc node data
3072 * - true: dump node link data as well
3073 * @buf: returned buffer of dump data in format
3074 */
3075int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
3076{
3077 int i = 0;
3078 size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
3079
3080 if (!n) {
3081 i += scnprintf(buf, sz, "node data: (null)\n");
3082 return i;
3083 }
3084
3085 i += scnprintf(buf, sz, "node data: %x", n->addr);
3086 i += scnprintf(buf + i, sz - i, " %x", n->state);
3087 i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
3088 i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
3089 i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
3090 i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
3091 i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
3092 i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
3093 i += scnprintf(buf + i, sz - i, " %u", n->working_links);
3094 i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
3095 i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
3096
3097 if (!more)
3098 return i;
3099
3100 i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
3101 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
3102 i += scnprintf(buf + i, sz - i, " media: ");
3103 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
3104 i += scnprintf(buf + i, sz - i, "\n");
3105 i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
3106 i += scnprintf(buf + i, sz - i, " inputq: ");
3107 i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
3108
3109 i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
3110 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
3111 i += scnprintf(buf + i, sz - i, " media: ");
3112 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
3113 i += scnprintf(buf + i, sz - i, "\n");
3114 i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
3115 i += scnprintf(buf + i, sz - i, " inputq: ");
3116 i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
3117
3118 i += scnprintf(buf + i, sz - i, "bclink:\n ");
3119 i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
3120
3121 return i;
3122}
3123
3124void tipc_node_pre_cleanup_net(struct net *exit_net)
3125{
3126 struct tipc_node *n;
3127 struct tipc_net *tn;
3128 struct net *tmp;
3129
3130 rcu_read_lock();
3131 for_each_net_rcu(tmp) {
3132 if (tmp == exit_net)
3133 continue;
3134 tn = tipc_net(tmp);
3135 if (!tn)
3136 continue;
3137 spin_lock_bh(&tn->node_list_lock);
3138 list_for_each_entry_rcu(n, &tn->node_list, list) {
3139 if (!n->peer_net)
3140 continue;
3141 if (n->peer_net != exit_net)
3142 continue;
3143 tipc_node_write_lock(n);
3144 n->peer_net = NULL;
3145 n->peer_hash_mix = 0;
3146 tipc_node_write_unlock_fast(n);
3147 break;
3148 }
3149 spin_unlock_bh(&tn->node_list_lock);
3150 }
3151 rcu_read_unlock();
3152}
1/*
2 * net/tipc/node.c: TIPC node management routines
3 *
4 * Copyright (c) 2000-2006, 2012-2016, Ericsson AB
5 * Copyright (c) 2005-2006, 2010-2014, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "link.h"
39#include "node.h"
40#include "name_distr.h"
41#include "socket.h"
42#include "bcast.h"
43#include "monitor.h"
44#include "discover.h"
45#include "netlink.h"
46#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 * @active_links: bearer ids of active links, used as index into links[] array
90 * @links: array containing references to all links to node
91 * @bc_entry: broadcast link entry
92 * @action_flags: bit mask of different types of node actions
93 * @state: connectivity state vs peer node
94 * @preliminary: a preliminary node or not
95 * @failover_sent: failover sent or not
96 * @sync_point: sequence number where synch/failover is finished
97 * @list: links to adjacent nodes in sorted list of cluster's nodes
98 * @working_links: number of working links to node (both active and standby)
99 * @link_cnt: number of links to node
100 * @capabilities: bitmap, indicating peer node's functional capabilities
101 * @signature: node instance identifier
102 * @link_id: local and remote bearer ids of changing link, if any
103 * @peer_id: 128-bit ID of peer
104 * @peer_id_string: ID string of peer
105 * @publ_list: list of publications
106 * @conn_sks: list of connections (FIXME)
107 * @timer: node's keepalive timer
108 * @keepalive_intv: keepalive interval in milliseconds
109 * @rcu: rcu struct for tipc_node
110 * @delete_at: indicates the time for deleting a down node
111 * @peer_net: peer's net namespace
112 * @peer_hash_mix: hash for this peer (FIXME)
113 * @crypto_rx: RX crypto handler
114 */
115struct tipc_node {
116 u32 addr;
117 struct kref kref;
118 rwlock_t lock;
119 struct net *net;
120 struct hlist_node hash;
121 int active_links[2];
122 struct tipc_link_entry links[MAX_BEARERS];
123 struct tipc_bclink_entry bc_entry;
124 int action_flags;
125 struct list_head list;
126 int state;
127 bool preliminary;
128 bool failover_sent;
129 u16 sync_point;
130 int link_cnt;
131 u16 working_links;
132 u16 capabilities;
133 u32 signature;
134 u32 link_id;
135 u8 peer_id[16];
136 char peer_id_string[NODE_ID_STR_LEN];
137 struct list_head publ_list;
138 struct list_head conn_sks;
139 unsigned long keepalive_intv;
140 struct timer_list timer;
141 struct rcu_head rcu;
142 unsigned long delete_at;
143 struct net *peer_net;
144 u32 peer_hash_mix;
145#ifdef CONFIG_TIPC_CRYPTO
146 struct tipc_crypto *crypto_rx;
147#endif
148};
149
150/* Node FSM states and events:
151 */
152enum {
153 SELF_DOWN_PEER_DOWN = 0xdd,
154 SELF_UP_PEER_UP = 0xaa,
155 SELF_DOWN_PEER_LEAVING = 0xd1,
156 SELF_UP_PEER_COMING = 0xac,
157 SELF_COMING_PEER_UP = 0xca,
158 SELF_LEAVING_PEER_DOWN = 0x1d,
159 NODE_FAILINGOVER = 0xf0,
160 NODE_SYNCHING = 0xcc
161};
162
163enum {
164 SELF_ESTABL_CONTACT_EVT = 0xece,
165 SELF_LOST_CONTACT_EVT = 0x1ce,
166 PEER_ESTABL_CONTACT_EVT = 0x9ece,
167 PEER_LOST_CONTACT_EVT = 0x91ce,
168 NODE_FAILOVER_BEGIN_EVT = 0xfbe,
169 NODE_FAILOVER_END_EVT = 0xfee,
170 NODE_SYNCH_BEGIN_EVT = 0xcbe,
171 NODE_SYNCH_END_EVT = 0xcee
172};
173
174static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
175 struct sk_buff_head *xmitq,
176 struct tipc_media_addr **maddr);
177static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
178 bool delete);
179static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
180static void tipc_node_delete(struct tipc_node *node);
181static void tipc_node_timeout(struct timer_list *t);
182static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
183static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
184static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
185static bool node_is_up(struct tipc_node *n);
186static void tipc_node_delete_from_list(struct tipc_node *node);
187
188struct tipc_sock_conn {
189 u32 port;
190 u32 peer_port;
191 u32 peer_node;
192 struct list_head list;
193};
194
195static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
196{
197 int bearer_id = n->active_links[sel & 1];
198
199 if (unlikely(bearer_id == INVALID_BEARER_ID))
200 return NULL;
201
202 return n->links[bearer_id].link;
203}
204
205int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel, bool connected)
206{
207 struct tipc_node *n;
208 int bearer_id;
209 unsigned int mtu = MAX_MSG_SIZE;
210
211 n = tipc_node_find(net, addr);
212 if (unlikely(!n))
213 return mtu;
214
215 /* Allow MAX_MSG_SIZE when building connection oriented message
216 * if they are in the same core network
217 */
218 if (n->peer_net && connected) {
219 tipc_node_put(n);
220 return mtu;
221 }
222
223 bearer_id = n->active_links[sel & 1];
224 if (likely(bearer_id != INVALID_BEARER_ID))
225 mtu = n->links[bearer_id].mtu;
226 tipc_node_put(n);
227 return mtu;
228}
229
230bool tipc_node_get_id(struct net *net, u32 addr, u8 *id)
231{
232 u8 *own_id = tipc_own_id(net);
233 struct tipc_node *n;
234
235 if (!own_id)
236 return true;
237
238 if (addr == tipc_own_addr(net)) {
239 memcpy(id, own_id, TIPC_NODEID_LEN);
240 return true;
241 }
242 n = tipc_node_find(net, addr);
243 if (!n)
244 return false;
245
246 memcpy(id, &n->peer_id, TIPC_NODEID_LEN);
247 tipc_node_put(n);
248 return true;
249}
250
251u16 tipc_node_get_capabilities(struct net *net, u32 addr)
252{
253 struct tipc_node *n;
254 u16 caps;
255
256 n = tipc_node_find(net, addr);
257 if (unlikely(!n))
258 return TIPC_NODE_CAPABILITIES;
259 caps = n->capabilities;
260 tipc_node_put(n);
261 return caps;
262}
263
264u32 tipc_node_get_addr(struct tipc_node *node)
265{
266 return (node) ? node->addr : 0;
267}
268
269char *tipc_node_get_id_str(struct tipc_node *node)
270{
271 return node->peer_id_string;
272}
273
274#ifdef CONFIG_TIPC_CRYPTO
275/**
276 * tipc_node_crypto_rx - Retrieve crypto RX handle from node
277 * @__n: target tipc_node
278 * Note: node ref counter must be held first!
279 */
280struct tipc_crypto *tipc_node_crypto_rx(struct tipc_node *__n)
281{
282 return (__n) ? __n->crypto_rx : NULL;
283}
284
285struct tipc_crypto *tipc_node_crypto_rx_by_list(struct list_head *pos)
286{
287 return container_of(pos, struct tipc_node, list)->crypto_rx;
288}
289
290struct tipc_crypto *tipc_node_crypto_rx_by_addr(struct net *net, u32 addr)
291{
292 struct tipc_node *n;
293
294 n = tipc_node_find(net, addr);
295 return (n) ? n->crypto_rx : NULL;
296}
297#endif
298
299static void tipc_node_free(struct rcu_head *rp)
300{
301 struct tipc_node *n = container_of(rp, struct tipc_node, rcu);
302
303#ifdef CONFIG_TIPC_CRYPTO
304 tipc_crypto_stop(&n->crypto_rx);
305#endif
306 kfree(n);
307}
308
309static void tipc_node_kref_release(struct kref *kref)
310{
311 struct tipc_node *n = container_of(kref, struct tipc_node, kref);
312
313 kfree(n->bc_entry.link);
314 call_rcu(&n->rcu, tipc_node_free);
315}
316
317void tipc_node_put(struct tipc_node *node)
318{
319 kref_put(&node->kref, tipc_node_kref_release);
320}
321
322void tipc_node_get(struct tipc_node *node)
323{
324 kref_get(&node->kref);
325}
326
327/*
328 * tipc_node_find - locate specified node object, if it exists
329 */
330static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
331{
332 struct tipc_net *tn = tipc_net(net);
333 struct tipc_node *node;
334 unsigned int thash = tipc_hashfn(addr);
335
336 rcu_read_lock();
337 hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
338 if (node->addr != addr || node->preliminary)
339 continue;
340 if (!kref_get_unless_zero(&node->kref))
341 node = NULL;
342 break;
343 }
344 rcu_read_unlock();
345 return node;
346}
347
348/* tipc_node_find_by_id - locate specified node object by its 128-bit id
349 * Note: this function is called only when a discovery request failed
350 * to find the node by its 32-bit id, and is not time critical
351 */
352static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id)
353{
354 struct tipc_net *tn = tipc_net(net);
355 struct tipc_node *n;
356 bool found = false;
357
358 rcu_read_lock();
359 list_for_each_entry_rcu(n, &tn->node_list, list) {
360 read_lock_bh(&n->lock);
361 if (!memcmp(id, n->peer_id, 16) &&
362 kref_get_unless_zero(&n->kref))
363 found = true;
364 read_unlock_bh(&n->lock);
365 if (found)
366 break;
367 }
368 rcu_read_unlock();
369 return found ? n : NULL;
370}
371
372static void tipc_node_read_lock(struct tipc_node *n)
373 __acquires(n->lock)
374{
375 read_lock_bh(&n->lock);
376}
377
378static void tipc_node_read_unlock(struct tipc_node *n)
379 __releases(n->lock)
380{
381 read_unlock_bh(&n->lock);
382}
383
384static void tipc_node_write_lock(struct tipc_node *n)
385 __acquires(n->lock)
386{
387 write_lock_bh(&n->lock);
388}
389
390static void tipc_node_write_unlock_fast(struct tipc_node *n)
391 __releases(n->lock)
392{
393 write_unlock_bh(&n->lock);
394}
395
396static void tipc_node_write_unlock(struct tipc_node *n)
397 __releases(n->lock)
398{
399 struct tipc_socket_addr sk;
400 struct net *net = n->net;
401 u32 flags = n->action_flags;
402 struct list_head *publ_list;
403 struct tipc_uaddr ua;
404 u32 bearer_id, node;
405
406 if (likely(!flags)) {
407 write_unlock_bh(&n->lock);
408 return;
409 }
410
411 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_NODE_SCOPE,
412 TIPC_LINK_STATE, n->addr, n->addr);
413 sk.ref = n->link_id;
414 sk.node = tipc_own_addr(net);
415 node = n->addr;
416 bearer_id = n->link_id & 0xffff;
417 publ_list = &n->publ_list;
418
419 n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
420 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
421
422 write_unlock_bh(&n->lock);
423
424 if (flags & TIPC_NOTIFY_NODE_DOWN)
425 tipc_publ_notify(net, publ_list, node, n->capabilities);
426
427 if (flags & TIPC_NOTIFY_NODE_UP)
428 tipc_named_node_up(net, node, n->capabilities);
429
430 if (flags & TIPC_NOTIFY_LINK_UP) {
431 tipc_mon_peer_up(net, node, bearer_id);
432 tipc_nametbl_publish(net, &ua, &sk, sk.ref);
433 }
434 if (flags & TIPC_NOTIFY_LINK_DOWN) {
435 tipc_mon_peer_down(net, node, bearer_id);
436 tipc_nametbl_withdraw(net, &ua, &sk, sk.ref);
437 }
438}
439
440static void tipc_node_assign_peer_net(struct tipc_node *n, u32 hash_mixes)
441{
442 int net_id = tipc_netid(n->net);
443 struct tipc_net *tn_peer;
444 struct net *tmp;
445 u32 hash_chk;
446
447 if (n->peer_net)
448 return;
449
450 for_each_net_rcu(tmp) {
451 tn_peer = tipc_net(tmp);
452 if (!tn_peer)
453 continue;
454 /* Integrity checking whether node exists in namespace or not */
455 if (tn_peer->net_id != net_id)
456 continue;
457 if (memcmp(n->peer_id, tn_peer->node_id, NODE_ID_LEN))
458 continue;
459 hash_chk = tipc_net_hash_mixes(tmp, tn_peer->random);
460 if (hash_mixes ^ hash_chk)
461 continue;
462 n->peer_net = tmp;
463 n->peer_hash_mix = hash_mixes;
464 break;
465 }
466}
467
468struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
469 u16 capabilities, u32 hash_mixes,
470 bool preliminary)
471{
472 struct tipc_net *tn = net_generic(net, tipc_net_id);
473 struct tipc_link *l, *snd_l = tipc_bc_sndlink(net);
474 struct tipc_node *n, *temp_node;
475 unsigned long intv;
476 int bearer_id;
477 int i;
478
479 spin_lock_bh(&tn->node_list_lock);
480 n = tipc_node_find(net, addr) ?:
481 tipc_node_find_by_id(net, peer_id);
482 if (n) {
483 if (!n->preliminary)
484 goto update;
485 if (preliminary)
486 goto exit;
487 /* A preliminary node becomes "real" now, refresh its data */
488 tipc_node_write_lock(n);
489 if (!tipc_link_bc_create(net, tipc_own_addr(net), addr, peer_id, U16_MAX,
490 tipc_link_min_win(snd_l), tipc_link_max_win(snd_l),
491 n->capabilities, &n->bc_entry.inputq1,
492 &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) {
493 pr_warn("Broadcast rcv link refresh failed, no memory\n");
494 tipc_node_write_unlock_fast(n);
495 tipc_node_put(n);
496 n = NULL;
497 goto exit;
498 }
499 n->preliminary = false;
500 n->addr = addr;
501 hlist_del_rcu(&n->hash);
502 hlist_add_head_rcu(&n->hash,
503 &tn->node_htable[tipc_hashfn(addr)]);
504 list_del_rcu(&n->list);
505 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
506 if (n->addr < temp_node->addr)
507 break;
508 }
509 list_add_tail_rcu(&n->list, &temp_node->list);
510 tipc_node_write_unlock_fast(n);
511
512update:
513 if (n->peer_hash_mix ^ hash_mixes)
514 tipc_node_assign_peer_net(n, hash_mixes);
515 if (n->capabilities == capabilities)
516 goto exit;
517 /* Same node may come back with new capabilities */
518 tipc_node_write_lock(n);
519 n->capabilities = capabilities;
520 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
521 l = n->links[bearer_id].link;
522 if (l)
523 tipc_link_update_caps(l, capabilities);
524 }
525 tipc_node_write_unlock_fast(n);
526
527 /* Calculate cluster capabilities */
528 tn->capabilities = TIPC_NODE_CAPABILITIES;
529 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
530 tn->capabilities &= temp_node->capabilities;
531 }
532
533 tipc_bcast_toggle_rcast(net,
534 (tn->capabilities & TIPC_BCAST_RCAST));
535
536 goto exit;
537 }
538 n = kzalloc(sizeof(*n), GFP_ATOMIC);
539 if (!n) {
540 pr_warn("Node creation failed, no memory\n");
541 goto exit;
542 }
543 tipc_nodeid2string(n->peer_id_string, peer_id);
544#ifdef CONFIG_TIPC_CRYPTO
545 if (unlikely(tipc_crypto_start(&n->crypto_rx, net, n))) {
546 pr_warn("Failed to start crypto RX(%s)!\n", n->peer_id_string);
547 kfree(n);
548 n = NULL;
549 goto exit;
550 }
551#endif
552 n->addr = addr;
553 n->preliminary = preliminary;
554 memcpy(&n->peer_id, peer_id, 16);
555 n->net = net;
556 n->peer_net = NULL;
557 n->peer_hash_mix = 0;
558 /* Assign kernel local namespace if exists */
559 tipc_node_assign_peer_net(n, hash_mixes);
560 n->capabilities = capabilities;
561 kref_init(&n->kref);
562 rwlock_init(&n->lock);
563 INIT_HLIST_NODE(&n->hash);
564 INIT_LIST_HEAD(&n->list);
565 INIT_LIST_HEAD(&n->publ_list);
566 INIT_LIST_HEAD(&n->conn_sks);
567 skb_queue_head_init(&n->bc_entry.namedq);
568 skb_queue_head_init(&n->bc_entry.inputq1);
569 __skb_queue_head_init(&n->bc_entry.arrvq);
570 skb_queue_head_init(&n->bc_entry.inputq2);
571 for (i = 0; i < MAX_BEARERS; i++)
572 spin_lock_init(&n->links[i].lock);
573 n->state = SELF_DOWN_PEER_LEAVING;
574 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
575 n->signature = INVALID_NODE_SIG;
576 n->active_links[0] = INVALID_BEARER_ID;
577 n->active_links[1] = INVALID_BEARER_ID;
578 if (!preliminary &&
579 !tipc_link_bc_create(net, tipc_own_addr(net), addr, peer_id, U16_MAX,
580 tipc_link_min_win(snd_l), tipc_link_max_win(snd_l),
581 n->capabilities, &n->bc_entry.inputq1,
582 &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) {
583 pr_warn("Broadcast rcv link creation failed, no memory\n");
584 tipc_node_put(n);
585 n = NULL;
586 goto exit;
587 }
588 tipc_node_get(n);
589 timer_setup(&n->timer, tipc_node_timeout, 0);
590 /* Start a slow timer anyway, crypto needs it */
591 n->keepalive_intv = 10000;
592 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
593 if (!mod_timer(&n->timer, intv))
594 tipc_node_get(n);
595 hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
596 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
597 if (n->addr < temp_node->addr)
598 break;
599 }
600 list_add_tail_rcu(&n->list, &temp_node->list);
601 /* Calculate cluster capabilities */
602 tn->capabilities = TIPC_NODE_CAPABILITIES;
603 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
604 tn->capabilities &= temp_node->capabilities;
605 }
606 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
607 trace_tipc_node_create(n, true, " ");
608exit:
609 spin_unlock_bh(&tn->node_list_lock);
610 return n;
611}
612
613static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
614{
615 unsigned long tol = tipc_link_tolerance(l);
616 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
617
618 /* Link with lowest tolerance determines timer interval */
619 if (intv < n->keepalive_intv)
620 n->keepalive_intv = intv;
621
622 /* Ensure link's abort limit corresponds to current tolerance */
623 tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
624}
625
626static void tipc_node_delete_from_list(struct tipc_node *node)
627{
628#ifdef CONFIG_TIPC_CRYPTO
629 tipc_crypto_key_flush(node->crypto_rx);
630#endif
631 list_del_rcu(&node->list);
632 hlist_del_rcu(&node->hash);
633 tipc_node_put(node);
634}
635
636static void tipc_node_delete(struct tipc_node *node)
637{
638 trace_tipc_node_delete(node, true, " ");
639 tipc_node_delete_from_list(node);
640
641 del_timer_sync(&node->timer);
642 tipc_node_put(node);
643}
644
645void tipc_node_stop(struct net *net)
646{
647 struct tipc_net *tn = tipc_net(net);
648 struct tipc_node *node, *t_node;
649
650 spin_lock_bh(&tn->node_list_lock);
651 list_for_each_entry_safe(node, t_node, &tn->node_list, list)
652 tipc_node_delete(node);
653 spin_unlock_bh(&tn->node_list_lock);
654}
655
656void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
657{
658 struct tipc_node *n;
659
660 if (in_own_node(net, addr))
661 return;
662
663 n = tipc_node_find(net, addr);
664 if (!n) {
665 pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
666 return;
667 }
668 tipc_node_write_lock(n);
669 list_add_tail(subscr, &n->publ_list);
670 tipc_node_write_unlock_fast(n);
671 tipc_node_put(n);
672}
673
674void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
675{
676 struct tipc_node *n;
677
678 if (in_own_node(net, addr))
679 return;
680
681 n = tipc_node_find(net, addr);
682 if (!n) {
683 pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
684 return;
685 }
686 tipc_node_write_lock(n);
687 list_del_init(subscr);
688 tipc_node_write_unlock_fast(n);
689 tipc_node_put(n);
690}
691
692int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
693{
694 struct tipc_node *node;
695 struct tipc_sock_conn *conn;
696 int err = 0;
697
698 if (in_own_node(net, dnode))
699 return 0;
700
701 node = tipc_node_find(net, dnode);
702 if (!node) {
703 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
704 return -EHOSTUNREACH;
705 }
706 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
707 if (!conn) {
708 err = -EHOSTUNREACH;
709 goto exit;
710 }
711 conn->peer_node = dnode;
712 conn->port = port;
713 conn->peer_port = peer_port;
714
715 tipc_node_write_lock(node);
716 list_add_tail(&conn->list, &node->conn_sks);
717 tipc_node_write_unlock(node);
718exit:
719 tipc_node_put(node);
720 return err;
721}
722
723void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
724{
725 struct tipc_node *node;
726 struct tipc_sock_conn *conn, *safe;
727
728 if (in_own_node(net, dnode))
729 return;
730
731 node = tipc_node_find(net, dnode);
732 if (!node)
733 return;
734
735 tipc_node_write_lock(node);
736 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
737 if (port != conn->port)
738 continue;
739 list_del(&conn->list);
740 kfree(conn);
741 }
742 tipc_node_write_unlock(node);
743 tipc_node_put(node);
744}
745
746static void tipc_node_clear_links(struct tipc_node *node)
747{
748 int i;
749
750 for (i = 0; i < MAX_BEARERS; i++) {
751 struct tipc_link_entry *le = &node->links[i];
752
753 if (le->link) {
754 kfree(le->link);
755 le->link = NULL;
756 node->link_cnt--;
757 }
758 }
759}
760
761/* tipc_node_cleanup - delete nodes that does not
762 * have active links for NODE_CLEANUP_AFTER time
763 */
764static bool tipc_node_cleanup(struct tipc_node *peer)
765{
766 struct tipc_node *temp_node;
767 struct tipc_net *tn = tipc_net(peer->net);
768 bool deleted = false;
769
770 /* If lock held by tipc_node_stop() the node will be deleted anyway */
771 if (!spin_trylock_bh(&tn->node_list_lock))
772 return false;
773
774 tipc_node_write_lock(peer);
775
776 if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) {
777 tipc_node_clear_links(peer);
778 tipc_node_delete_from_list(peer);
779 deleted = true;
780 }
781 tipc_node_write_unlock(peer);
782
783 if (!deleted) {
784 spin_unlock_bh(&tn->node_list_lock);
785 return deleted;
786 }
787
788 /* Calculate cluster capabilities */
789 tn->capabilities = TIPC_NODE_CAPABILITIES;
790 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
791 tn->capabilities &= temp_node->capabilities;
792 }
793 tipc_bcast_toggle_rcast(peer->net,
794 (tn->capabilities & TIPC_BCAST_RCAST));
795 spin_unlock_bh(&tn->node_list_lock);
796 return deleted;
797}
798
799/* tipc_node_timeout - handle expiration of node timer
800 */
801static void tipc_node_timeout(struct timer_list *t)
802{
803 struct tipc_node *n = from_timer(n, t, timer);
804 struct tipc_link_entry *le;
805 struct sk_buff_head xmitq;
806 int remains = n->link_cnt;
807 int bearer_id;
808 int rc = 0;
809
810 trace_tipc_node_timeout(n, false, " ");
811 if (!node_is_up(n) && tipc_node_cleanup(n)) {
812 /*Removing the reference of Timer*/
813 tipc_node_put(n);
814 return;
815 }
816
817#ifdef CONFIG_TIPC_CRYPTO
818 /* Take any crypto key related actions first */
819 tipc_crypto_timeout(n->crypto_rx);
820#endif
821 __skb_queue_head_init(&xmitq);
822
823 /* Initial node interval to value larger (10 seconds), then it will be
824 * recalculated with link lowest tolerance
825 */
826 tipc_node_read_lock(n);
827 n->keepalive_intv = 10000;
828 tipc_node_read_unlock(n);
829 for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) {
830 tipc_node_read_lock(n);
831 le = &n->links[bearer_id];
832 if (le->link) {
833 spin_lock_bh(&le->lock);
834 /* Link tolerance may change asynchronously: */
835 tipc_node_calculate_timer(n, le->link);
836 rc = tipc_link_timeout(le->link, &xmitq);
837 spin_unlock_bh(&le->lock);
838 remains--;
839 }
840 tipc_node_read_unlock(n);
841 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr, n);
842 if (rc & TIPC_LINK_DOWN_EVT)
843 tipc_node_link_down(n, bearer_id, false);
844 }
845 mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
846}
847
848/**
849 * __tipc_node_link_up - handle addition of link
850 * @n: target tipc_node
851 * @bearer_id: id of the bearer
852 * @xmitq: queue for messages to be xmited on
853 * Node lock must be held by caller
854 * Link becomes active (alone or shared) or standby, depending on its priority.
855 */
856static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
857 struct sk_buff_head *xmitq)
858{
859 int *slot0 = &n->active_links[0];
860 int *slot1 = &n->active_links[1];
861 struct tipc_link *ol = node_active_link(n, 0);
862 struct tipc_link *nl = n->links[bearer_id].link;
863
864 if (!nl || tipc_link_is_up(nl))
865 return;
866
867 tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
868 if (!tipc_link_is_up(nl))
869 return;
870
871 n->working_links++;
872 n->action_flags |= TIPC_NOTIFY_LINK_UP;
873 n->link_id = tipc_link_id(nl);
874
875 /* Leave room for tunnel header when returning 'mtu' to users: */
876 n->links[bearer_id].mtu = tipc_link_mss(nl);
877
878 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
879 tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
880
881 pr_debug("Established link <%s> on network plane %c\n",
882 tipc_link_name(nl), tipc_link_plane(nl));
883 trace_tipc_node_link_up(n, true, " ");
884
885 /* Ensure that a STATE message goes first */
886 tipc_link_build_state_msg(nl, xmitq);
887
888 /* First link? => give it both slots */
889 if (!ol) {
890 *slot0 = bearer_id;
891 *slot1 = bearer_id;
892 tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
893 n->action_flags |= TIPC_NOTIFY_NODE_UP;
894 tipc_link_set_active(nl, true);
895 tipc_bcast_add_peer(n->net, nl, xmitq);
896 return;
897 }
898
899 /* Second link => redistribute slots */
900 if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
901 pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
902 *slot0 = bearer_id;
903 *slot1 = bearer_id;
904 tipc_link_set_active(nl, true);
905 tipc_link_set_active(ol, false);
906 } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
907 tipc_link_set_active(nl, true);
908 *slot1 = bearer_id;
909 } else {
910 pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
911 }
912
913 /* Prepare synchronization with first link */
914 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
915}
916
917/**
918 * tipc_node_link_up - handle addition of link
919 * @n: target tipc_node
920 * @bearer_id: id of the bearer
921 * @xmitq: queue for messages to be xmited on
922 *
923 * Link becomes active (alone or shared) or standby, depending on its priority.
924 */
925static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
926 struct sk_buff_head *xmitq)
927{
928 struct tipc_media_addr *maddr;
929
930 tipc_node_write_lock(n);
931 __tipc_node_link_up(n, bearer_id, xmitq);
932 maddr = &n->links[bearer_id].maddr;
933 tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr, n);
934 tipc_node_write_unlock(n);
935}
936
937/**
938 * tipc_node_link_failover() - start failover in case "half-failover"
939 *
940 * This function is only called in a very special situation where link
941 * failover can be already started on peer node but not on this node.
942 * This can happen when e.g.::
943 *
944 * 1. Both links <1A-2A>, <1B-2B> down
945 * 2. Link endpoint 2A up, but 1A still down (e.g. due to network
946 * disturbance, wrong session, etc.)
947 * 3. Link <1B-2B> up
948 * 4. Link endpoint 2A down (e.g. due to link tolerance timeout)
949 * 5. Node 2 starts failover onto link <1B-2B>
950 *
951 * ==> Node 1 does never start link/node failover!
952 *
953 * @n: tipc node structure
954 * @l: link peer endpoint failingover (- can be NULL)
955 * @tnl: tunnel link
956 * @xmitq: queue for messages to be xmited on tnl link later
957 */
958static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,
959 struct tipc_link *tnl,
960 struct sk_buff_head *xmitq)
961{
962 /* Avoid to be "self-failover" that can never end */
963 if (!tipc_link_is_up(tnl))
964 return;
965
966 /* Don't rush, failure link may be in the process of resetting */
967 if (l && !tipc_link_is_reset(l))
968 return;
969
970 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
971 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
972
973 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
974 tipc_link_failover_prepare(l, tnl, xmitq);
975
976 if (l)
977 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
978 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
979}
980
981/**
982 * __tipc_node_link_down - handle loss of link
983 * @n: target tipc_node
984 * @bearer_id: id of the bearer
985 * @xmitq: queue for messages to be xmited on
986 * @maddr: output media address of the bearer
987 */
988static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
989 struct sk_buff_head *xmitq,
990 struct tipc_media_addr **maddr)
991{
992 struct tipc_link_entry *le = &n->links[*bearer_id];
993 int *slot0 = &n->active_links[0];
994 int *slot1 = &n->active_links[1];
995 int i, highest = 0, prio;
996 struct tipc_link *l, *_l, *tnl;
997
998 l = n->links[*bearer_id].link;
999 if (!l || tipc_link_is_reset(l))
1000 return;
1001
1002 n->working_links--;
1003 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
1004 n->link_id = tipc_link_id(l);
1005
1006 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
1007
1008 pr_debug("Lost link <%s> on network plane %c\n",
1009 tipc_link_name(l), tipc_link_plane(l));
1010
1011 /* Select new active link if any available */
1012 *slot0 = INVALID_BEARER_ID;
1013 *slot1 = INVALID_BEARER_ID;
1014 for (i = 0; i < MAX_BEARERS; i++) {
1015 _l = n->links[i].link;
1016 if (!_l || !tipc_link_is_up(_l))
1017 continue;
1018 if (_l == l)
1019 continue;
1020 prio = tipc_link_prio(_l);
1021 if (prio < highest)
1022 continue;
1023 if (prio > highest) {
1024 highest = prio;
1025 *slot0 = i;
1026 *slot1 = i;
1027 continue;
1028 }
1029 *slot1 = i;
1030 }
1031
1032 if (!node_is_up(n)) {
1033 if (tipc_link_peer_is_down(l))
1034 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1035 tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
1036 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!");
1037 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1038 tipc_link_reset(l);
1039 tipc_link_build_reset_msg(l, xmitq);
1040 *maddr = &n->links[*bearer_id].maddr;
1041 node_lost_contact(n, &le->inputq);
1042 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1043 return;
1044 }
1045 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1046
1047 /* There is still a working link => initiate failover */
1048 *bearer_id = n->active_links[0];
1049 tnl = n->links[*bearer_id].link;
1050 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1051 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1052 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
1053 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
1054 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!");
1055 tipc_link_reset(l);
1056 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1057 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1058 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
1059 *maddr = &n->links[*bearer_id].maddr;
1060}
1061
1062static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
1063{
1064 struct tipc_link_entry *le = &n->links[bearer_id];
1065 struct tipc_media_addr *maddr = NULL;
1066 struct tipc_link *l = le->link;
1067 int old_bearer_id = bearer_id;
1068 struct sk_buff_head xmitq;
1069
1070 if (!l)
1071 return;
1072
1073 __skb_queue_head_init(&xmitq);
1074
1075 tipc_node_write_lock(n);
1076 if (!tipc_link_is_establishing(l)) {
1077 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
1078 } else {
1079 /* Defuse pending tipc_node_link_up() */
1080 tipc_link_reset(l);
1081 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1082 }
1083 if (delete) {
1084 kfree(l);
1085 le->link = NULL;
1086 n->link_cnt--;
1087 }
1088 trace_tipc_node_link_down(n, true, "node link down or deleted!");
1089 tipc_node_write_unlock(n);
1090 if (delete)
1091 tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
1092 if (!skb_queue_empty(&xmitq))
1093 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr, n);
1094 tipc_sk_rcv(n->net, &le->inputq);
1095}
1096
1097static bool node_is_up(struct tipc_node *n)
1098{
1099 return n->active_links[0] != INVALID_BEARER_ID;
1100}
1101
1102bool tipc_node_is_up(struct net *net, u32 addr)
1103{
1104 struct tipc_node *n;
1105 bool retval = false;
1106
1107 if (in_own_node(net, addr))
1108 return true;
1109
1110 n = tipc_node_find(net, addr);
1111 if (!n)
1112 return false;
1113 retval = node_is_up(n);
1114 tipc_node_put(n);
1115 return retval;
1116}
1117
1118static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
1119{
1120 struct tipc_node *n;
1121
1122 addr ^= tipc_net(net)->random;
1123 while ((n = tipc_node_find(net, addr))) {
1124 tipc_node_put(n);
1125 addr++;
1126 }
1127 return addr;
1128}
1129
1130/* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
1131 * Returns suggested address if any, otherwise 0
1132 */
1133u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
1134{
1135 struct tipc_net *tn = tipc_net(net);
1136 struct tipc_node *n;
1137 bool preliminary;
1138 u32 sugg_addr;
1139
1140 /* Suggest new address if some other peer is using this one */
1141 n = tipc_node_find(net, addr);
1142 if (n) {
1143 if (!memcmp(n->peer_id, id, NODE_ID_LEN))
1144 addr = 0;
1145 tipc_node_put(n);
1146 if (!addr)
1147 return 0;
1148 return tipc_node_suggest_addr(net, addr);
1149 }
1150
1151 /* Suggest previously used address if peer is known */
1152 n = tipc_node_find_by_id(net, id);
1153 if (n) {
1154 sugg_addr = n->addr;
1155 preliminary = n->preliminary;
1156 tipc_node_put(n);
1157 if (!preliminary)
1158 return sugg_addr;
1159 }
1160
1161 /* Even this node may be in conflict */
1162 if (tn->trial_addr == addr)
1163 return tipc_node_suggest_addr(net, addr);
1164
1165 return 0;
1166}
1167
1168void tipc_node_check_dest(struct net *net, u32 addr,
1169 u8 *peer_id, struct tipc_bearer *b,
1170 u16 capabilities, u32 signature, u32 hash_mixes,
1171 struct tipc_media_addr *maddr,
1172 bool *respond, bool *dupl_addr)
1173{
1174 struct tipc_node *n;
1175 struct tipc_link *l;
1176 struct tipc_link_entry *le;
1177 bool addr_match = false;
1178 bool sign_match = false;
1179 bool link_up = false;
1180 bool link_is_reset = false;
1181 bool accept_addr = false;
1182 bool reset = false;
1183 char *if_name;
1184 unsigned long intv;
1185 u16 session;
1186
1187 *dupl_addr = false;
1188 *respond = false;
1189
1190 n = tipc_node_create(net, addr, peer_id, capabilities, hash_mixes,
1191 false);
1192 if (!n)
1193 return;
1194
1195 tipc_node_write_lock(n);
1196
1197 le = &n->links[b->identity];
1198
1199 /* Prepare to validate requesting node's signature and media address */
1200 l = le->link;
1201 link_up = l && tipc_link_is_up(l);
1202 link_is_reset = l && tipc_link_is_reset(l);
1203 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
1204 sign_match = (signature == n->signature);
1205
1206 /* These three flags give us eight permutations: */
1207
1208 if (sign_match && addr_match && link_up) {
1209 /* All is fine. Ignore requests. */
1210 /* Peer node is not a container/local namespace */
1211 if (!n->peer_hash_mix)
1212 n->peer_hash_mix = hash_mixes;
1213 } else if (sign_match && addr_match && !link_up) {
1214 /* Respond. The link will come up in due time */
1215 *respond = true;
1216 } else if (sign_match && !addr_match && link_up) {
1217 /* Peer has changed i/f address without rebooting.
1218 * If so, the link will reset soon, and the next
1219 * discovery will be accepted. So we can ignore it.
1220 * It may also be a cloned or malicious peer having
1221 * chosen the same node address and signature as an
1222 * existing one.
1223 * Ignore requests until the link goes down, if ever.
1224 */
1225 *dupl_addr = true;
1226 } else if (sign_match && !addr_match && !link_up) {
1227 /* Peer link has changed i/f address without rebooting.
1228 * It may also be a cloned or malicious peer; we can't
1229 * distinguish between the two.
1230 * The signature is correct, so we must accept.
1231 */
1232 accept_addr = true;
1233 *respond = true;
1234 reset = true;
1235 } else if (!sign_match && addr_match && link_up) {
1236 /* Peer node rebooted. Two possibilities:
1237 * - Delayed re-discovery; this link endpoint has already
1238 * reset and re-established contact with the peer, before
1239 * receiving a discovery message from that node.
1240 * (The peer happened to receive one from this node first).
1241 * - The peer came back so fast that our side has not
1242 * discovered it yet. Probing from this side will soon
1243 * reset the link, since there can be no working link
1244 * endpoint at the peer end, and the link will re-establish.
1245 * Accept the signature, since it comes from a known peer.
1246 */
1247 n->signature = signature;
1248 } else if (!sign_match && addr_match && !link_up) {
1249 /* The peer node has rebooted.
1250 * Accept signature, since it is a known peer.
1251 */
1252 n->signature = signature;
1253 *respond = true;
1254 } else if (!sign_match && !addr_match && link_up) {
1255 /* Peer rebooted with new address, or a new/duplicate peer.
1256 * Ignore until the link goes down, if ever.
1257 */
1258 *dupl_addr = true;
1259 } else if (!sign_match && !addr_match && !link_up) {
1260 /* Peer rebooted with new address, or it is a new peer.
1261 * Accept signature and address.
1262 */
1263 n->signature = signature;
1264 accept_addr = true;
1265 *respond = true;
1266 reset = true;
1267 }
1268
1269 if (!accept_addr)
1270 goto exit;
1271
1272 /* Now create new link if not already existing */
1273 if (!l) {
1274 if (n->link_cnt == 2)
1275 goto exit;
1276
1277 if_name = strchr(b->name, ':') + 1;
1278 get_random_bytes(&session, sizeof(u16));
1279 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
1280 b->net_plane, b->mtu, b->priority,
1281 b->min_win, b->max_win, session,
1282 tipc_own_addr(net), addr, peer_id,
1283 n->capabilities,
1284 tipc_bc_sndlink(n->net), n->bc_entry.link,
1285 &le->inputq,
1286 &n->bc_entry.namedq, &l)) {
1287 *respond = false;
1288 goto exit;
1289 }
1290 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!");
1291 tipc_link_reset(l);
1292 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1293 if (n->state == NODE_FAILINGOVER)
1294 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1295 link_is_reset = tipc_link_is_reset(l);
1296 le->link = l;
1297 n->link_cnt++;
1298 tipc_node_calculate_timer(n, l);
1299 if (n->link_cnt == 1) {
1300 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
1301 if (!mod_timer(&n->timer, intv))
1302 tipc_node_get(n);
1303 }
1304 }
1305 memcpy(&le->maddr, maddr, sizeof(*maddr));
1306exit:
1307 tipc_node_write_unlock(n);
1308 if (reset && !link_is_reset)
1309 tipc_node_link_down(n, b->identity, false);
1310 tipc_node_put(n);
1311}
1312
1313void tipc_node_delete_links(struct net *net, int bearer_id)
1314{
1315 struct tipc_net *tn = net_generic(net, tipc_net_id);
1316 struct tipc_node *n;
1317
1318 rcu_read_lock();
1319 list_for_each_entry_rcu(n, &tn->node_list, list) {
1320 tipc_node_link_down(n, bearer_id, true);
1321 }
1322 rcu_read_unlock();
1323}
1324
1325static void tipc_node_reset_links(struct tipc_node *n)
1326{
1327 int i;
1328
1329 pr_warn("Resetting all links to %x\n", n->addr);
1330
1331 trace_tipc_node_reset_links(n, true, " ");
1332 for (i = 0; i < MAX_BEARERS; i++) {
1333 tipc_node_link_down(n, i, false);
1334 }
1335}
1336
1337/* tipc_node_fsm_evt - node finite state machine
1338 * Determines when contact is allowed with peer node
1339 */
1340static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
1341{
1342 int state = n->state;
1343
1344 switch (state) {
1345 case SELF_DOWN_PEER_DOWN:
1346 switch (evt) {
1347 case SELF_ESTABL_CONTACT_EVT:
1348 state = SELF_UP_PEER_COMING;
1349 break;
1350 case PEER_ESTABL_CONTACT_EVT:
1351 state = SELF_COMING_PEER_UP;
1352 break;
1353 case SELF_LOST_CONTACT_EVT:
1354 case PEER_LOST_CONTACT_EVT:
1355 break;
1356 case NODE_SYNCH_END_EVT:
1357 case NODE_SYNCH_BEGIN_EVT:
1358 case NODE_FAILOVER_BEGIN_EVT:
1359 case NODE_FAILOVER_END_EVT:
1360 default:
1361 goto illegal_evt;
1362 }
1363 break;
1364 case SELF_UP_PEER_UP:
1365 switch (evt) {
1366 case SELF_LOST_CONTACT_EVT:
1367 state = SELF_DOWN_PEER_LEAVING;
1368 break;
1369 case PEER_LOST_CONTACT_EVT:
1370 state = SELF_LEAVING_PEER_DOWN;
1371 break;
1372 case NODE_SYNCH_BEGIN_EVT:
1373 state = NODE_SYNCHING;
1374 break;
1375 case NODE_FAILOVER_BEGIN_EVT:
1376 state = NODE_FAILINGOVER;
1377 break;
1378 case SELF_ESTABL_CONTACT_EVT:
1379 case PEER_ESTABL_CONTACT_EVT:
1380 case NODE_SYNCH_END_EVT:
1381 case NODE_FAILOVER_END_EVT:
1382 break;
1383 default:
1384 goto illegal_evt;
1385 }
1386 break;
1387 case SELF_DOWN_PEER_LEAVING:
1388 switch (evt) {
1389 case PEER_LOST_CONTACT_EVT:
1390 state = SELF_DOWN_PEER_DOWN;
1391 break;
1392 case SELF_ESTABL_CONTACT_EVT:
1393 case PEER_ESTABL_CONTACT_EVT:
1394 case SELF_LOST_CONTACT_EVT:
1395 break;
1396 case NODE_SYNCH_END_EVT:
1397 case NODE_SYNCH_BEGIN_EVT:
1398 case NODE_FAILOVER_BEGIN_EVT:
1399 case NODE_FAILOVER_END_EVT:
1400 default:
1401 goto illegal_evt;
1402 }
1403 break;
1404 case SELF_UP_PEER_COMING:
1405 switch (evt) {
1406 case PEER_ESTABL_CONTACT_EVT:
1407 state = SELF_UP_PEER_UP;
1408 break;
1409 case SELF_LOST_CONTACT_EVT:
1410 state = SELF_DOWN_PEER_DOWN;
1411 break;
1412 case SELF_ESTABL_CONTACT_EVT:
1413 case PEER_LOST_CONTACT_EVT:
1414 case NODE_SYNCH_END_EVT:
1415 case NODE_FAILOVER_BEGIN_EVT:
1416 break;
1417 case NODE_SYNCH_BEGIN_EVT:
1418 case NODE_FAILOVER_END_EVT:
1419 default:
1420 goto illegal_evt;
1421 }
1422 break;
1423 case SELF_COMING_PEER_UP:
1424 switch (evt) {
1425 case SELF_ESTABL_CONTACT_EVT:
1426 state = SELF_UP_PEER_UP;
1427 break;
1428 case PEER_LOST_CONTACT_EVT:
1429 state = SELF_DOWN_PEER_DOWN;
1430 break;
1431 case SELF_LOST_CONTACT_EVT:
1432 case PEER_ESTABL_CONTACT_EVT:
1433 break;
1434 case NODE_SYNCH_END_EVT:
1435 case NODE_SYNCH_BEGIN_EVT:
1436 case NODE_FAILOVER_BEGIN_EVT:
1437 case NODE_FAILOVER_END_EVT:
1438 default:
1439 goto illegal_evt;
1440 }
1441 break;
1442 case SELF_LEAVING_PEER_DOWN:
1443 switch (evt) {
1444 case SELF_LOST_CONTACT_EVT:
1445 state = SELF_DOWN_PEER_DOWN;
1446 break;
1447 case SELF_ESTABL_CONTACT_EVT:
1448 case PEER_ESTABL_CONTACT_EVT:
1449 case PEER_LOST_CONTACT_EVT:
1450 break;
1451 case NODE_SYNCH_END_EVT:
1452 case NODE_SYNCH_BEGIN_EVT:
1453 case NODE_FAILOVER_BEGIN_EVT:
1454 case NODE_FAILOVER_END_EVT:
1455 default:
1456 goto illegal_evt;
1457 }
1458 break;
1459 case NODE_FAILINGOVER:
1460 switch (evt) {
1461 case SELF_LOST_CONTACT_EVT:
1462 state = SELF_DOWN_PEER_LEAVING;
1463 break;
1464 case PEER_LOST_CONTACT_EVT:
1465 state = SELF_LEAVING_PEER_DOWN;
1466 break;
1467 case NODE_FAILOVER_END_EVT:
1468 state = SELF_UP_PEER_UP;
1469 break;
1470 case NODE_FAILOVER_BEGIN_EVT:
1471 case SELF_ESTABL_CONTACT_EVT:
1472 case PEER_ESTABL_CONTACT_EVT:
1473 break;
1474 case NODE_SYNCH_BEGIN_EVT:
1475 case NODE_SYNCH_END_EVT:
1476 default:
1477 goto illegal_evt;
1478 }
1479 break;
1480 case NODE_SYNCHING:
1481 switch (evt) {
1482 case SELF_LOST_CONTACT_EVT:
1483 state = SELF_DOWN_PEER_LEAVING;
1484 break;
1485 case PEER_LOST_CONTACT_EVT:
1486 state = SELF_LEAVING_PEER_DOWN;
1487 break;
1488 case NODE_SYNCH_END_EVT:
1489 state = SELF_UP_PEER_UP;
1490 break;
1491 case NODE_FAILOVER_BEGIN_EVT:
1492 state = NODE_FAILINGOVER;
1493 break;
1494 case NODE_SYNCH_BEGIN_EVT:
1495 case SELF_ESTABL_CONTACT_EVT:
1496 case PEER_ESTABL_CONTACT_EVT:
1497 break;
1498 case NODE_FAILOVER_END_EVT:
1499 default:
1500 goto illegal_evt;
1501 }
1502 break;
1503 default:
1504 pr_err("Unknown node fsm state %x\n", state);
1505 break;
1506 }
1507 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1508 n->state = state;
1509 return;
1510
1511illegal_evt:
1512 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1513 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1514}
1515
1516static void node_lost_contact(struct tipc_node *n,
1517 struct sk_buff_head *inputq)
1518{
1519 struct tipc_sock_conn *conn, *safe;
1520 struct tipc_link *l;
1521 struct list_head *conns = &n->conn_sks;
1522 struct sk_buff *skb;
1523 uint i;
1524
1525 pr_debug("Lost contact with %x\n", n->addr);
1526 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
1527 trace_tipc_node_lost_contact(n, true, " ");
1528
1529 /* Clean up broadcast state */
1530 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1531 skb_queue_purge(&n->bc_entry.namedq);
1532
1533 /* Abort any ongoing link failover */
1534 for (i = 0; i < MAX_BEARERS; i++) {
1535 l = n->links[i].link;
1536 if (l)
1537 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1538 }
1539
1540 /* Notify publications from this node */
1541 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1542 n->peer_net = NULL;
1543 n->peer_hash_mix = 0;
1544 /* Notify sockets connected to node */
1545 list_for_each_entry_safe(conn, safe, conns, list) {
1546 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1547 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1548 conn->peer_node, conn->port,
1549 conn->peer_port, TIPC_ERR_NO_NODE);
1550 if (likely(skb))
1551 skb_queue_tail(inputq, skb);
1552 list_del(&conn->list);
1553 kfree(conn);
1554 }
1555}
1556
1557/**
1558 * tipc_node_get_linkname - get the name of a link
1559 *
1560 * @net: the applicable net namespace
1561 * @bearer_id: id of the bearer
1562 * @addr: peer node address
1563 * @linkname: link name output buffer
1564 * @len: size of @linkname output buffer
1565 *
1566 * Return: 0 on success
1567 */
1568int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1569 char *linkname, size_t len)
1570{
1571 struct tipc_link *link;
1572 int err = -EINVAL;
1573 struct tipc_node *node = tipc_node_find(net, addr);
1574
1575 if (!node)
1576 return err;
1577
1578 if (bearer_id >= MAX_BEARERS)
1579 goto exit;
1580
1581 tipc_node_read_lock(node);
1582 link = node->links[bearer_id].link;
1583 if (link) {
1584 strncpy(linkname, tipc_link_name(link), len);
1585 err = 0;
1586 }
1587 tipc_node_read_unlock(node);
1588exit:
1589 tipc_node_put(node);
1590 return err;
1591}
1592
1593/* Caller should hold node lock for the passed node */
1594static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1595{
1596 void *hdr;
1597 struct nlattr *attrs;
1598
1599 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1600 NLM_F_MULTI, TIPC_NL_NODE_GET);
1601 if (!hdr)
1602 return -EMSGSIZE;
1603
1604 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NODE);
1605 if (!attrs)
1606 goto msg_full;
1607
1608 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1609 goto attr_msg_full;
1610 if (node_is_up(node))
1611 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1612 goto attr_msg_full;
1613
1614 nla_nest_end(msg->skb, attrs);
1615 genlmsg_end(msg->skb, hdr);
1616
1617 return 0;
1618
1619attr_msg_full:
1620 nla_nest_cancel(msg->skb, attrs);
1621msg_full:
1622 genlmsg_cancel(msg->skb, hdr);
1623
1624 return -EMSGSIZE;
1625}
1626
1627static void tipc_lxc_xmit(struct net *peer_net, struct sk_buff_head *list)
1628{
1629 struct tipc_msg *hdr = buf_msg(skb_peek(list));
1630 struct sk_buff_head inputq;
1631
1632 switch (msg_user(hdr)) {
1633 case TIPC_LOW_IMPORTANCE:
1634 case TIPC_MEDIUM_IMPORTANCE:
1635 case TIPC_HIGH_IMPORTANCE:
1636 case TIPC_CRITICAL_IMPORTANCE:
1637 if (msg_connected(hdr) || msg_named(hdr) ||
1638 msg_direct(hdr)) {
1639 tipc_loopback_trace(peer_net, list);
1640 spin_lock_init(&list->lock);
1641 tipc_sk_rcv(peer_net, list);
1642 return;
1643 }
1644 if (msg_mcast(hdr)) {
1645 tipc_loopback_trace(peer_net, list);
1646 skb_queue_head_init(&inputq);
1647 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1648 __skb_queue_purge(list);
1649 skb_queue_purge(&inputq);
1650 return;
1651 }
1652 return;
1653 case MSG_FRAGMENTER:
1654 if (tipc_msg_assemble(list)) {
1655 tipc_loopback_trace(peer_net, list);
1656 skb_queue_head_init(&inputq);
1657 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1658 __skb_queue_purge(list);
1659 skb_queue_purge(&inputq);
1660 }
1661 return;
1662 case GROUP_PROTOCOL:
1663 case CONN_MANAGER:
1664 tipc_loopback_trace(peer_net, list);
1665 spin_lock_init(&list->lock);
1666 tipc_sk_rcv(peer_net, list);
1667 return;
1668 case LINK_PROTOCOL:
1669 case NAME_DISTRIBUTOR:
1670 case TUNNEL_PROTOCOL:
1671 case BCAST_PROTOCOL:
1672 return;
1673 default:
1674 return;
1675 }
1676}
1677
1678/**
1679 * tipc_node_xmit() - general link level function for message sending
1680 * @net: the applicable net namespace
1681 * @list: chain of buffers containing message
1682 * @dnode: address of destination node
1683 * @selector: a number used for deterministic link selection
1684 * Consumes the buffer chain.
1685 * Return: 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1686 */
1687int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1688 u32 dnode, int selector)
1689{
1690 struct tipc_link_entry *le = NULL;
1691 struct tipc_node *n;
1692 struct sk_buff_head xmitq;
1693 bool node_up = false;
1694 struct net *peer_net;
1695 int bearer_id;
1696 int rc;
1697
1698 if (in_own_node(net, dnode)) {
1699 tipc_loopback_trace(net, list);
1700 spin_lock_init(&list->lock);
1701 tipc_sk_rcv(net, list);
1702 return 0;
1703 }
1704
1705 n = tipc_node_find(net, dnode);
1706 if (unlikely(!n)) {
1707 __skb_queue_purge(list);
1708 return -EHOSTUNREACH;
1709 }
1710
1711 rcu_read_lock();
1712 tipc_node_read_lock(n);
1713 node_up = node_is_up(n);
1714 peer_net = n->peer_net;
1715 tipc_node_read_unlock(n);
1716 if (node_up && peer_net && check_net(peer_net)) {
1717 /* xmit inner linux container */
1718 tipc_lxc_xmit(peer_net, list);
1719 if (likely(skb_queue_empty(list))) {
1720 rcu_read_unlock();
1721 tipc_node_put(n);
1722 return 0;
1723 }
1724 }
1725 rcu_read_unlock();
1726
1727 tipc_node_read_lock(n);
1728 bearer_id = n->active_links[selector & 1];
1729 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1730 tipc_node_read_unlock(n);
1731 tipc_node_put(n);
1732 __skb_queue_purge(list);
1733 return -EHOSTUNREACH;
1734 }
1735
1736 __skb_queue_head_init(&xmitq);
1737 le = &n->links[bearer_id];
1738 spin_lock_bh(&le->lock);
1739 rc = tipc_link_xmit(le->link, list, &xmitq);
1740 spin_unlock_bh(&le->lock);
1741 tipc_node_read_unlock(n);
1742
1743 if (unlikely(rc == -ENOBUFS))
1744 tipc_node_link_down(n, bearer_id, false);
1745 else
1746 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1747
1748 tipc_node_put(n);
1749
1750 return rc;
1751}
1752
1753/* tipc_node_xmit_skb(): send single buffer to destination
1754 * Buffers sent via this function are generally TIPC_SYSTEM_IMPORTANCE
1755 * messages, which will not be rejected
1756 * The only exception is datagram messages rerouted after secondary
1757 * lookup, which are rare and safe to dispose of anyway.
1758 */
1759int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1760 u32 selector)
1761{
1762 struct sk_buff_head head;
1763
1764 __skb_queue_head_init(&head);
1765 __skb_queue_tail(&head, skb);
1766 tipc_node_xmit(net, &head, dnode, selector);
1767 return 0;
1768}
1769
1770/* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1771 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1772 */
1773int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1774{
1775 struct sk_buff *skb;
1776 u32 selector, dnode;
1777
1778 while ((skb = __skb_dequeue(xmitq))) {
1779 selector = msg_origport(buf_msg(skb));
1780 dnode = msg_destnode(buf_msg(skb));
1781 tipc_node_xmit_skb(net, skb, dnode, selector);
1782 }
1783 return 0;
1784}
1785
1786void tipc_node_broadcast(struct net *net, struct sk_buff *skb, int rc_dests)
1787{
1788 struct sk_buff_head xmitq;
1789 struct sk_buff *txskb;
1790 struct tipc_node *n;
1791 u16 dummy;
1792 u32 dst;
1793
1794 /* Use broadcast if all nodes support it */
1795 if (!rc_dests && tipc_bcast_get_mode(net) != BCLINK_MODE_RCAST) {
1796 __skb_queue_head_init(&xmitq);
1797 __skb_queue_tail(&xmitq, skb);
1798 tipc_bcast_xmit(net, &xmitq, &dummy);
1799 return;
1800 }
1801
1802 /* Otherwise use legacy replicast method */
1803 rcu_read_lock();
1804 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1805 dst = n->addr;
1806 if (in_own_node(net, dst))
1807 continue;
1808 if (!node_is_up(n))
1809 continue;
1810 txskb = pskb_copy(skb, GFP_ATOMIC);
1811 if (!txskb)
1812 break;
1813 msg_set_destnode(buf_msg(txskb), dst);
1814 tipc_node_xmit_skb(net, txskb, dst, 0);
1815 }
1816 rcu_read_unlock();
1817 kfree_skb(skb);
1818}
1819
1820static void tipc_node_mcast_rcv(struct tipc_node *n)
1821{
1822 struct tipc_bclink_entry *be = &n->bc_entry;
1823
1824 /* 'arrvq' is under inputq2's lock protection */
1825 spin_lock_bh(&be->inputq2.lock);
1826 spin_lock_bh(&be->inputq1.lock);
1827 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1828 spin_unlock_bh(&be->inputq1.lock);
1829 spin_unlock_bh(&be->inputq2.lock);
1830 tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1831}
1832
1833static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1834 int bearer_id, struct sk_buff_head *xmitq)
1835{
1836 struct tipc_link *ucl;
1837 int rc;
1838
1839 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr, xmitq);
1840
1841 if (rc & TIPC_LINK_DOWN_EVT) {
1842 tipc_node_reset_links(n);
1843 return;
1844 }
1845
1846 if (!(rc & TIPC_LINK_SND_STATE))
1847 return;
1848
1849 /* If probe message, a STATE response will be sent anyway */
1850 if (msg_probe(hdr))
1851 return;
1852
1853 /* Produce a STATE message carrying broadcast NACK */
1854 tipc_node_read_lock(n);
1855 ucl = n->links[bearer_id].link;
1856 if (ucl)
1857 tipc_link_build_state_msg(ucl, xmitq);
1858 tipc_node_read_unlock(n);
1859}
1860
1861/**
1862 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1863 * @net: the applicable net namespace
1864 * @skb: TIPC packet
1865 * @bearer_id: id of bearer message arrived on
1866 *
1867 * Invoked with no locks held.
1868 */
1869static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1870{
1871 int rc;
1872 struct sk_buff_head xmitq;
1873 struct tipc_bclink_entry *be;
1874 struct tipc_link_entry *le;
1875 struct tipc_msg *hdr = buf_msg(skb);
1876 int usr = msg_user(hdr);
1877 u32 dnode = msg_destnode(hdr);
1878 struct tipc_node *n;
1879
1880 __skb_queue_head_init(&xmitq);
1881
1882 /* If NACK for other node, let rcv link for that node peek into it */
1883 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1884 n = tipc_node_find(net, dnode);
1885 else
1886 n = tipc_node_find(net, msg_prevnode(hdr));
1887 if (!n) {
1888 kfree_skb(skb);
1889 return;
1890 }
1891 be = &n->bc_entry;
1892 le = &n->links[bearer_id];
1893
1894 rc = tipc_bcast_rcv(net, be->link, skb);
1895
1896 /* Broadcast ACKs are sent on a unicast link */
1897 if (rc & TIPC_LINK_SND_STATE) {
1898 tipc_node_read_lock(n);
1899 tipc_link_build_state_msg(le->link, &xmitq);
1900 tipc_node_read_unlock(n);
1901 }
1902
1903 if (!skb_queue_empty(&xmitq))
1904 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1905
1906 if (!skb_queue_empty(&be->inputq1))
1907 tipc_node_mcast_rcv(n);
1908
1909 /* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
1910 if (!skb_queue_empty(&n->bc_entry.namedq))
1911 tipc_named_rcv(net, &n->bc_entry.namedq,
1912 &n->bc_entry.named_rcv_nxt,
1913 &n->bc_entry.named_open);
1914
1915 /* If reassembly or retransmission failure => reset all links to peer */
1916 if (rc & TIPC_LINK_DOWN_EVT)
1917 tipc_node_reset_links(n);
1918
1919 tipc_node_put(n);
1920}
1921
1922/**
1923 * tipc_node_check_state - check and if necessary update node state
1924 * @n: target tipc_node
1925 * @skb: TIPC packet
1926 * @bearer_id: identity of bearer delivering the packet
1927 * @xmitq: queue for messages to be xmited on
1928 * Return: true if state and msg are ok, otherwise false
1929 */
1930static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1931 int bearer_id, struct sk_buff_head *xmitq)
1932{
1933 struct tipc_msg *hdr = buf_msg(skb);
1934 int usr = msg_user(hdr);
1935 int mtyp = msg_type(hdr);
1936 u16 oseqno = msg_seqno(hdr);
1937 u16 exp_pkts = msg_msgcnt(hdr);
1938 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1939 int state = n->state;
1940 struct tipc_link *l, *tnl, *pl = NULL;
1941 struct tipc_media_addr *maddr;
1942 int pb_id;
1943
1944 if (trace_tipc_node_check_state_enabled()) {
1945 trace_tipc_skb_dump(skb, false, "skb for node state check");
1946 trace_tipc_node_check_state(n, true, " ");
1947 }
1948 l = n->links[bearer_id].link;
1949 if (!l)
1950 return false;
1951 rcv_nxt = tipc_link_rcv_nxt(l);
1952
1953
1954 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1955 return true;
1956
1957 /* Find parallel link, if any */
1958 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1959 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1960 pl = n->links[pb_id].link;
1961 break;
1962 }
1963 }
1964
1965 if (!tipc_link_validate_msg(l, hdr)) {
1966 trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
1967 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
1968 return false;
1969 }
1970
1971 /* Check and update node accesibility if applicable */
1972 if (state == SELF_UP_PEER_COMING) {
1973 if (!tipc_link_is_up(l))
1974 return true;
1975 if (!msg_peer_link_is_up(hdr))
1976 return true;
1977 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1978 }
1979
1980 if (state == SELF_DOWN_PEER_LEAVING) {
1981 if (msg_peer_node_is_up(hdr))
1982 return false;
1983 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1984 return true;
1985 }
1986
1987 if (state == SELF_LEAVING_PEER_DOWN)
1988 return false;
1989
1990 /* Ignore duplicate packets */
1991 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1992 return true;
1993
1994 /* Initiate or update failover mode if applicable */
1995 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1996 syncpt = oseqno + exp_pkts - 1;
1997 if (pl && !tipc_link_is_reset(pl)) {
1998 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1999 trace_tipc_node_link_down(n, true,
2000 "node link down <- failover!");
2001 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
2002 tipc_link_inputq(l));
2003 }
2004
2005 /* If parallel link was already down, and this happened before
2006 * the tunnel link came up, node failover was never started.
2007 * Ensure that a FAILOVER_MSG is sent to get peer out of
2008 * NODE_FAILINGOVER state, also this node must accept
2009 * TUNNEL_MSGs from peer.
2010 */
2011 if (n->state != NODE_FAILINGOVER)
2012 tipc_node_link_failover(n, pl, l, xmitq);
2013
2014 /* If pkts arrive out of order, use lowest calculated syncpt */
2015 if (less(syncpt, n->sync_point))
2016 n->sync_point = syncpt;
2017 }
2018
2019 /* Open parallel link when tunnel link reaches synch point */
2020 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
2021 if (!more(rcv_nxt, n->sync_point))
2022 return true;
2023 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
2024 if (pl)
2025 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
2026 return true;
2027 }
2028
2029 /* No syncing needed if only one link */
2030 if (!pl || !tipc_link_is_up(pl))
2031 return true;
2032
2033 /* Initiate synch mode if applicable */
2034 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
2035 if (n->capabilities & TIPC_TUNNEL_ENHANCED)
2036 syncpt = msg_syncpt(hdr);
2037 else
2038 syncpt = msg_seqno(msg_inner_hdr(hdr)) + exp_pkts - 1;
2039 if (!tipc_link_is_up(l))
2040 __tipc_node_link_up(n, bearer_id, xmitq);
2041 if (n->state == SELF_UP_PEER_UP) {
2042 n->sync_point = syncpt;
2043 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
2044 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
2045 }
2046 }
2047
2048 /* Open tunnel link when parallel link reaches synch point */
2049 if (n->state == NODE_SYNCHING) {
2050 if (tipc_link_is_synching(l)) {
2051 tnl = l;
2052 } else {
2053 tnl = pl;
2054 pl = l;
2055 }
2056 inputq_len = skb_queue_len(tipc_link_inputq(pl));
2057 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
2058 if (more(dlv_nxt, n->sync_point)) {
2059 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
2060 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
2061 return true;
2062 }
2063 if (l == pl)
2064 return true;
2065 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
2066 return true;
2067 if (usr == LINK_PROTOCOL)
2068 return true;
2069 return false;
2070 }
2071 return true;
2072}
2073
2074/**
2075 * tipc_rcv - process TIPC packets/messages arriving from off-node
2076 * @net: the applicable net namespace
2077 * @skb: TIPC packet
2078 * @b: pointer to bearer message arrived on
2079 *
2080 * Invoked with no locks held. Bearer pointer must point to a valid bearer
2081 * structure (i.e. cannot be NULL), but bearer can be inactive.
2082 */
2083void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
2084{
2085 struct sk_buff_head xmitq;
2086 struct tipc_link_entry *le;
2087 struct tipc_msg *hdr;
2088 struct tipc_node *n;
2089 int bearer_id = b->identity;
2090 u32 self = tipc_own_addr(net);
2091 int usr, rc = 0;
2092 u16 bc_ack;
2093#ifdef CONFIG_TIPC_CRYPTO
2094 struct tipc_ehdr *ehdr;
2095
2096 /* Check if message must be decrypted first */
2097 if (TIPC_SKB_CB(skb)->decrypted || !tipc_ehdr_validate(skb))
2098 goto rcv;
2099
2100 ehdr = (struct tipc_ehdr *)skb->data;
2101 if (likely(ehdr->user != LINK_CONFIG)) {
2102 n = tipc_node_find(net, ntohl(ehdr->addr));
2103 if (unlikely(!n))
2104 goto discard;
2105 } else {
2106 n = tipc_node_find_by_id(net, ehdr->id);
2107 }
2108 skb_dst_force(skb);
2109 tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b);
2110 if (!skb)
2111 return;
2112
2113rcv:
2114#endif
2115 /* Ensure message is well-formed before touching the header */
2116 if (unlikely(!tipc_msg_validate(&skb)))
2117 goto discard;
2118 __skb_queue_head_init(&xmitq);
2119 hdr = buf_msg(skb);
2120 usr = msg_user(hdr);
2121 bc_ack = msg_bcast_ack(hdr);
2122
2123 /* Handle arrival of discovery or broadcast packet */
2124 if (unlikely(msg_non_seq(hdr))) {
2125 if (unlikely(usr == LINK_CONFIG))
2126 return tipc_disc_rcv(net, skb, b);
2127 else
2128 return tipc_node_bc_rcv(net, skb, bearer_id);
2129 }
2130
2131 /* Discard unicast link messages destined for another node */
2132 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
2133 goto discard;
2134
2135 /* Locate neighboring node that sent packet */
2136 n = tipc_node_find(net, msg_prevnode(hdr));
2137 if (unlikely(!n))
2138 goto discard;
2139 le = &n->links[bearer_id];
2140
2141 /* Ensure broadcast reception is in synch with peer's send state */
2142 if (unlikely(usr == LINK_PROTOCOL)) {
2143 if (unlikely(skb_linearize(skb))) {
2144 tipc_node_put(n);
2145 goto discard;
2146 }
2147 hdr = buf_msg(skb);
2148 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
2149 } else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack)) {
2150 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
2151 }
2152
2153 /* Receive packet directly if conditions permit */
2154 tipc_node_read_lock(n);
2155 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
2156 spin_lock_bh(&le->lock);
2157 if (le->link) {
2158 rc = tipc_link_rcv(le->link, skb, &xmitq);
2159 skb = NULL;
2160 }
2161 spin_unlock_bh(&le->lock);
2162 }
2163 tipc_node_read_unlock(n);
2164
2165 /* Check/update node state before receiving */
2166 if (unlikely(skb)) {
2167 if (unlikely(skb_linearize(skb)))
2168 goto out_node_put;
2169 tipc_node_write_lock(n);
2170 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
2171 if (le->link) {
2172 rc = tipc_link_rcv(le->link, skb, &xmitq);
2173 skb = NULL;
2174 }
2175 }
2176 tipc_node_write_unlock(n);
2177 }
2178
2179 if (unlikely(rc & TIPC_LINK_UP_EVT))
2180 tipc_node_link_up(n, bearer_id, &xmitq);
2181
2182 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
2183 tipc_node_link_down(n, bearer_id, false);
2184
2185 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
2186 tipc_named_rcv(net, &n->bc_entry.namedq,
2187 &n->bc_entry.named_rcv_nxt,
2188 &n->bc_entry.named_open);
2189
2190 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
2191 tipc_node_mcast_rcv(n);
2192
2193 if (!skb_queue_empty(&le->inputq))
2194 tipc_sk_rcv(net, &le->inputq);
2195
2196 if (!skb_queue_empty(&xmitq))
2197 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
2198
2199out_node_put:
2200 tipc_node_put(n);
2201discard:
2202 kfree_skb(skb);
2203}
2204
2205void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
2206 int prop)
2207{
2208 struct tipc_net *tn = tipc_net(net);
2209 int bearer_id = b->identity;
2210 struct sk_buff_head xmitq;
2211 struct tipc_link_entry *e;
2212 struct tipc_node *n;
2213
2214 __skb_queue_head_init(&xmitq);
2215
2216 rcu_read_lock();
2217
2218 list_for_each_entry_rcu(n, &tn->node_list, list) {
2219 tipc_node_write_lock(n);
2220 e = &n->links[bearer_id];
2221 if (e->link) {
2222 if (prop == TIPC_NLA_PROP_TOL)
2223 tipc_link_set_tolerance(e->link, b->tolerance,
2224 &xmitq);
2225 else if (prop == TIPC_NLA_PROP_MTU)
2226 tipc_link_set_mtu(e->link, b->mtu);
2227
2228 /* Update MTU for node link entry */
2229 e->mtu = tipc_link_mss(e->link);
2230 }
2231
2232 tipc_node_write_unlock(n);
2233 tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
2234 }
2235
2236 rcu_read_unlock();
2237}
2238
2239int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
2240{
2241 struct net *net = sock_net(skb->sk);
2242 struct tipc_net *tn = net_generic(net, tipc_net_id);
2243 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
2244 struct tipc_node *peer, *temp_node;
2245 u8 node_id[NODE_ID_LEN];
2246 u64 *w0 = (u64 *)&node_id[0];
2247 u64 *w1 = (u64 *)&node_id[8];
2248 u32 addr;
2249 int err;
2250
2251 /* We identify the peer by its net */
2252 if (!info->attrs[TIPC_NLA_NET])
2253 return -EINVAL;
2254
2255 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
2256 info->attrs[TIPC_NLA_NET],
2257 tipc_nl_net_policy, info->extack);
2258 if (err)
2259 return err;
2260
2261 /* attrs[TIPC_NLA_NET_NODEID] and attrs[TIPC_NLA_NET_ADDR] are
2262 * mutually exclusive cases
2263 */
2264 if (attrs[TIPC_NLA_NET_ADDR]) {
2265 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
2266 if (!addr)
2267 return -EINVAL;
2268 }
2269
2270 if (attrs[TIPC_NLA_NET_NODEID]) {
2271 if (!attrs[TIPC_NLA_NET_NODEID_W1])
2272 return -EINVAL;
2273 *w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
2274 *w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
2275 addr = hash128to32(node_id);
2276 }
2277
2278 if (in_own_node(net, addr))
2279 return -ENOTSUPP;
2280
2281 spin_lock_bh(&tn->node_list_lock);
2282 peer = tipc_node_find(net, addr);
2283 if (!peer) {
2284 spin_unlock_bh(&tn->node_list_lock);
2285 return -ENXIO;
2286 }
2287
2288 tipc_node_write_lock(peer);
2289 if (peer->state != SELF_DOWN_PEER_DOWN &&
2290 peer->state != SELF_DOWN_PEER_LEAVING) {
2291 tipc_node_write_unlock(peer);
2292 err = -EBUSY;
2293 goto err_out;
2294 }
2295
2296 tipc_node_clear_links(peer);
2297 tipc_node_write_unlock(peer);
2298 tipc_node_delete(peer);
2299
2300 /* Calculate cluster capabilities */
2301 tn->capabilities = TIPC_NODE_CAPABILITIES;
2302 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
2303 tn->capabilities &= temp_node->capabilities;
2304 }
2305 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
2306 err = 0;
2307err_out:
2308 tipc_node_put(peer);
2309 spin_unlock_bh(&tn->node_list_lock);
2310
2311 return err;
2312}
2313
2314int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
2315{
2316 int err;
2317 struct net *net = sock_net(skb->sk);
2318 struct tipc_net *tn = net_generic(net, tipc_net_id);
2319 int done = cb->args[0];
2320 int last_addr = cb->args[1];
2321 struct tipc_node *node;
2322 struct tipc_nl_msg msg;
2323
2324 if (done)
2325 return 0;
2326
2327 msg.skb = skb;
2328 msg.portid = NETLINK_CB(cb->skb).portid;
2329 msg.seq = cb->nlh->nlmsg_seq;
2330
2331 rcu_read_lock();
2332 if (last_addr) {
2333 node = tipc_node_find(net, last_addr);
2334 if (!node) {
2335 rcu_read_unlock();
2336 /* We never set seq or call nl_dump_check_consistent()
2337 * this means that setting prev_seq here will cause the
2338 * consistence check to fail in the netlink callback
2339 * handler. Resulting in the NLMSG_DONE message having
2340 * the NLM_F_DUMP_INTR flag set if the node state
2341 * changed while we released the lock.
2342 */
2343 cb->prev_seq = 1;
2344 return -EPIPE;
2345 }
2346 tipc_node_put(node);
2347 }
2348
2349 list_for_each_entry_rcu(node, &tn->node_list, list) {
2350 if (node->preliminary)
2351 continue;
2352 if (last_addr) {
2353 if (node->addr == last_addr)
2354 last_addr = 0;
2355 else
2356 continue;
2357 }
2358
2359 tipc_node_read_lock(node);
2360 err = __tipc_nl_add_node(&msg, node);
2361 if (err) {
2362 last_addr = node->addr;
2363 tipc_node_read_unlock(node);
2364 goto out;
2365 }
2366
2367 tipc_node_read_unlock(node);
2368 }
2369 done = 1;
2370out:
2371 cb->args[0] = done;
2372 cb->args[1] = last_addr;
2373 rcu_read_unlock();
2374
2375 return skb->len;
2376}
2377
2378/* tipc_node_find_by_name - locate owner node of link by link's name
2379 * @net: the applicable net namespace
2380 * @name: pointer to link name string
2381 * @bearer_id: pointer to index in 'node->links' array where the link was found.
2382 *
2383 * Returns pointer to node owning the link, or 0 if no matching link is found.
2384 */
2385static struct tipc_node *tipc_node_find_by_name(struct net *net,
2386 const char *link_name,
2387 unsigned int *bearer_id)
2388{
2389 struct tipc_net *tn = net_generic(net, tipc_net_id);
2390 struct tipc_link *l;
2391 struct tipc_node *n;
2392 struct tipc_node *found_node = NULL;
2393 int i;
2394
2395 *bearer_id = 0;
2396 rcu_read_lock();
2397 list_for_each_entry_rcu(n, &tn->node_list, list) {
2398 tipc_node_read_lock(n);
2399 for (i = 0; i < MAX_BEARERS; i++) {
2400 l = n->links[i].link;
2401 if (l && !strcmp(tipc_link_name(l), link_name)) {
2402 *bearer_id = i;
2403 found_node = n;
2404 break;
2405 }
2406 }
2407 tipc_node_read_unlock(n);
2408 if (found_node)
2409 break;
2410 }
2411 rcu_read_unlock();
2412
2413 return found_node;
2414}
2415
2416int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
2417{
2418 int err;
2419 int res = 0;
2420 int bearer_id;
2421 char *name;
2422 struct tipc_link *link;
2423 struct tipc_node *node;
2424 struct sk_buff_head xmitq;
2425 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2426 struct net *net = sock_net(skb->sk);
2427
2428 __skb_queue_head_init(&xmitq);
2429
2430 if (!info->attrs[TIPC_NLA_LINK])
2431 return -EINVAL;
2432
2433 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2434 info->attrs[TIPC_NLA_LINK],
2435 tipc_nl_link_policy, info->extack);
2436 if (err)
2437 return err;
2438
2439 if (!attrs[TIPC_NLA_LINK_NAME])
2440 return -EINVAL;
2441
2442 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2443
2444 if (strcmp(name, tipc_bclink_name) == 0)
2445 return tipc_nl_bc_link_set(net, attrs);
2446
2447 node = tipc_node_find_by_name(net, name, &bearer_id);
2448 if (!node)
2449 return -EINVAL;
2450
2451 tipc_node_read_lock(node);
2452
2453 link = node->links[bearer_id].link;
2454 if (!link) {
2455 res = -EINVAL;
2456 goto out;
2457 }
2458
2459 if (attrs[TIPC_NLA_LINK_PROP]) {
2460 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2461
2462 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
2463 if (err) {
2464 res = err;
2465 goto out;
2466 }
2467
2468 if (props[TIPC_NLA_PROP_TOL]) {
2469 u32 tol;
2470
2471 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2472 tipc_link_set_tolerance(link, tol, &xmitq);
2473 }
2474 if (props[TIPC_NLA_PROP_PRIO]) {
2475 u32 prio;
2476
2477 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2478 tipc_link_set_prio(link, prio, &xmitq);
2479 }
2480 if (props[TIPC_NLA_PROP_WIN]) {
2481 u32 max_win;
2482
2483 max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2484 tipc_link_set_queue_limits(link,
2485 tipc_link_min_win(link),
2486 max_win);
2487 }
2488 }
2489
2490out:
2491 tipc_node_read_unlock(node);
2492 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr,
2493 NULL);
2494 return res;
2495}
2496
2497int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
2498{
2499 struct net *net = genl_info_net(info);
2500 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2501 struct tipc_nl_msg msg;
2502 char *name;
2503 int err;
2504
2505 msg.portid = info->snd_portid;
2506 msg.seq = info->snd_seq;
2507
2508 if (!info->attrs[TIPC_NLA_LINK])
2509 return -EINVAL;
2510
2511 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2512 info->attrs[TIPC_NLA_LINK],
2513 tipc_nl_link_policy, info->extack);
2514 if (err)
2515 return err;
2516
2517 if (!attrs[TIPC_NLA_LINK_NAME])
2518 return -EINVAL;
2519
2520 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2521
2522 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2523 if (!msg.skb)
2524 return -ENOMEM;
2525
2526 if (strcmp(name, tipc_bclink_name) == 0) {
2527 err = tipc_nl_add_bc_link(net, &msg, tipc_net(net)->bcl);
2528 if (err)
2529 goto err_free;
2530 } else {
2531 int bearer_id;
2532 struct tipc_node *node;
2533 struct tipc_link *link;
2534
2535 node = tipc_node_find_by_name(net, name, &bearer_id);
2536 if (!node) {
2537 err = -EINVAL;
2538 goto err_free;
2539 }
2540
2541 tipc_node_read_lock(node);
2542 link = node->links[bearer_id].link;
2543 if (!link) {
2544 tipc_node_read_unlock(node);
2545 err = -EINVAL;
2546 goto err_free;
2547 }
2548
2549 err = __tipc_nl_add_link(net, &msg, link, 0);
2550 tipc_node_read_unlock(node);
2551 if (err)
2552 goto err_free;
2553 }
2554
2555 return genlmsg_reply(msg.skb, info);
2556
2557err_free:
2558 nlmsg_free(msg.skb);
2559 return err;
2560}
2561
2562int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2563{
2564 int err;
2565 char *link_name;
2566 unsigned int bearer_id;
2567 struct tipc_link *link;
2568 struct tipc_node *node;
2569 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2570 struct net *net = sock_net(skb->sk);
2571 struct tipc_net *tn = tipc_net(net);
2572 struct tipc_link_entry *le;
2573
2574 if (!info->attrs[TIPC_NLA_LINK])
2575 return -EINVAL;
2576
2577 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2578 info->attrs[TIPC_NLA_LINK],
2579 tipc_nl_link_policy, info->extack);
2580 if (err)
2581 return err;
2582
2583 if (!attrs[TIPC_NLA_LINK_NAME])
2584 return -EINVAL;
2585
2586 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2587
2588 err = -EINVAL;
2589 if (!strcmp(link_name, tipc_bclink_name)) {
2590 err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
2591 if (err)
2592 return err;
2593 return 0;
2594 } else if (strstr(link_name, tipc_bclink_name)) {
2595 rcu_read_lock();
2596 list_for_each_entry_rcu(node, &tn->node_list, list) {
2597 tipc_node_read_lock(node);
2598 link = node->bc_entry.link;
2599 if (link && !strcmp(link_name, tipc_link_name(link))) {
2600 err = tipc_bclink_reset_stats(net, link);
2601 tipc_node_read_unlock(node);
2602 break;
2603 }
2604 tipc_node_read_unlock(node);
2605 }
2606 rcu_read_unlock();
2607 return err;
2608 }
2609
2610 node = tipc_node_find_by_name(net, link_name, &bearer_id);
2611 if (!node)
2612 return -EINVAL;
2613
2614 le = &node->links[bearer_id];
2615 tipc_node_read_lock(node);
2616 spin_lock_bh(&le->lock);
2617 link = node->links[bearer_id].link;
2618 if (!link) {
2619 spin_unlock_bh(&le->lock);
2620 tipc_node_read_unlock(node);
2621 return -EINVAL;
2622 }
2623 tipc_link_reset_stats(link);
2624 spin_unlock_bh(&le->lock);
2625 tipc_node_read_unlock(node);
2626 return 0;
2627}
2628
2629/* Caller should hold node lock */
2630static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2631 struct tipc_node *node, u32 *prev_link,
2632 bool bc_link)
2633{
2634 u32 i;
2635 int err;
2636
2637 for (i = *prev_link; i < MAX_BEARERS; i++) {
2638 *prev_link = i;
2639
2640 if (!node->links[i].link)
2641 continue;
2642
2643 err = __tipc_nl_add_link(net, msg,
2644 node->links[i].link, NLM_F_MULTI);
2645 if (err)
2646 return err;
2647 }
2648
2649 if (bc_link) {
2650 *prev_link = i;
2651 err = tipc_nl_add_bc_link(net, msg, node->bc_entry.link);
2652 if (err)
2653 return err;
2654 }
2655
2656 *prev_link = 0;
2657
2658 return 0;
2659}
2660
2661int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2662{
2663 struct net *net = sock_net(skb->sk);
2664 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
2665 struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
2666 struct tipc_net *tn = net_generic(net, tipc_net_id);
2667 struct tipc_node *node;
2668 struct tipc_nl_msg msg;
2669 u32 prev_node = cb->args[0];
2670 u32 prev_link = cb->args[1];
2671 int done = cb->args[2];
2672 bool bc_link = cb->args[3];
2673 int err;
2674
2675 if (done)
2676 return 0;
2677
2678 if (!prev_node) {
2679 /* Check if broadcast-receiver links dumping is needed */
2680 if (attrs && attrs[TIPC_NLA_LINK]) {
2681 err = nla_parse_nested_deprecated(link,
2682 TIPC_NLA_LINK_MAX,
2683 attrs[TIPC_NLA_LINK],
2684 tipc_nl_link_policy,
2685 NULL);
2686 if (unlikely(err))
2687 return err;
2688 if (unlikely(!link[TIPC_NLA_LINK_BROADCAST]))
2689 return -EINVAL;
2690 bc_link = true;
2691 }
2692 }
2693
2694 msg.skb = skb;
2695 msg.portid = NETLINK_CB(cb->skb).portid;
2696 msg.seq = cb->nlh->nlmsg_seq;
2697
2698 rcu_read_lock();
2699 if (prev_node) {
2700 node = tipc_node_find(net, prev_node);
2701 if (!node) {
2702 /* We never set seq or call nl_dump_check_consistent()
2703 * this means that setting prev_seq here will cause the
2704 * consistence check to fail in the netlink callback
2705 * handler. Resulting in the last NLMSG_DONE message
2706 * having the NLM_F_DUMP_INTR flag set.
2707 */
2708 cb->prev_seq = 1;
2709 goto out;
2710 }
2711 tipc_node_put(node);
2712
2713 list_for_each_entry_continue_rcu(node, &tn->node_list,
2714 list) {
2715 tipc_node_read_lock(node);
2716 err = __tipc_nl_add_node_links(net, &msg, node,
2717 &prev_link, bc_link);
2718 tipc_node_read_unlock(node);
2719 if (err)
2720 goto out;
2721
2722 prev_node = node->addr;
2723 }
2724 } else {
2725 err = tipc_nl_add_bc_link(net, &msg, tn->bcl);
2726 if (err)
2727 goto out;
2728
2729 list_for_each_entry_rcu(node, &tn->node_list, list) {
2730 tipc_node_read_lock(node);
2731 err = __tipc_nl_add_node_links(net, &msg, node,
2732 &prev_link, bc_link);
2733 tipc_node_read_unlock(node);
2734 if (err)
2735 goto out;
2736
2737 prev_node = node->addr;
2738 }
2739 }
2740 done = 1;
2741out:
2742 rcu_read_unlock();
2743
2744 cb->args[0] = prev_node;
2745 cb->args[1] = prev_link;
2746 cb->args[2] = done;
2747 cb->args[3] = bc_link;
2748
2749 return skb->len;
2750}
2751
2752int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2753{
2754 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2755 struct net *net = sock_net(skb->sk);
2756 int err;
2757
2758 if (!info->attrs[TIPC_NLA_MON])
2759 return -EINVAL;
2760
2761 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
2762 info->attrs[TIPC_NLA_MON],
2763 tipc_nl_monitor_policy,
2764 info->extack);
2765 if (err)
2766 return err;
2767
2768 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2769 u32 val;
2770
2771 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2772 err = tipc_nl_monitor_set_threshold(net, val);
2773 if (err)
2774 return err;
2775 }
2776
2777 return 0;
2778}
2779
2780static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2781{
2782 struct nlattr *attrs;
2783 void *hdr;
2784 u32 val;
2785
2786 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2787 0, TIPC_NL_MON_GET);
2788 if (!hdr)
2789 return -EMSGSIZE;
2790
2791 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
2792 if (!attrs)
2793 goto msg_full;
2794
2795 val = tipc_nl_monitor_get_threshold(net);
2796
2797 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2798 goto attr_msg_full;
2799
2800 nla_nest_end(msg->skb, attrs);
2801 genlmsg_end(msg->skb, hdr);
2802
2803 return 0;
2804
2805attr_msg_full:
2806 nla_nest_cancel(msg->skb, attrs);
2807msg_full:
2808 genlmsg_cancel(msg->skb, hdr);
2809
2810 return -EMSGSIZE;
2811}
2812
2813int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2814{
2815 struct net *net = sock_net(skb->sk);
2816 struct tipc_nl_msg msg;
2817 int err;
2818
2819 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2820 if (!msg.skb)
2821 return -ENOMEM;
2822 msg.portid = info->snd_portid;
2823 msg.seq = info->snd_seq;
2824
2825 err = __tipc_nl_add_monitor_prop(net, &msg);
2826 if (err) {
2827 nlmsg_free(msg.skb);
2828 return err;
2829 }
2830
2831 return genlmsg_reply(msg.skb, info);
2832}
2833
2834int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2835{
2836 struct net *net = sock_net(skb->sk);
2837 u32 prev_bearer = cb->args[0];
2838 struct tipc_nl_msg msg;
2839 int bearer_id;
2840 int err;
2841
2842 if (prev_bearer == MAX_BEARERS)
2843 return 0;
2844
2845 msg.skb = skb;
2846 msg.portid = NETLINK_CB(cb->skb).portid;
2847 msg.seq = cb->nlh->nlmsg_seq;
2848
2849 rtnl_lock();
2850 for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2851 err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2852 if (err)
2853 break;
2854 }
2855 rtnl_unlock();
2856 cb->args[0] = bearer_id;
2857
2858 return skb->len;
2859}
2860
2861int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2862 struct netlink_callback *cb)
2863{
2864 struct net *net = sock_net(skb->sk);
2865 u32 prev_node = cb->args[1];
2866 u32 bearer_id = cb->args[2];
2867 int done = cb->args[0];
2868 struct tipc_nl_msg msg;
2869 int err;
2870
2871 if (!prev_node) {
2872 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
2873 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2874
2875 if (!attrs[TIPC_NLA_MON])
2876 return -EINVAL;
2877
2878 err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
2879 attrs[TIPC_NLA_MON],
2880 tipc_nl_monitor_policy,
2881 NULL);
2882 if (err)
2883 return err;
2884
2885 if (!mon[TIPC_NLA_MON_REF])
2886 return -EINVAL;
2887
2888 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2889
2890 if (bearer_id >= MAX_BEARERS)
2891 return -EINVAL;
2892 }
2893
2894 if (done)
2895 return 0;
2896
2897 msg.skb = skb;
2898 msg.portid = NETLINK_CB(cb->skb).portid;
2899 msg.seq = cb->nlh->nlmsg_seq;
2900
2901 rtnl_lock();
2902 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2903 if (!err)
2904 done = 1;
2905
2906 rtnl_unlock();
2907 cb->args[0] = done;
2908 cb->args[1] = prev_node;
2909 cb->args[2] = bearer_id;
2910
2911 return skb->len;
2912}
2913
2914#ifdef CONFIG_TIPC_CRYPTO
2915static int tipc_nl_retrieve_key(struct nlattr **attrs,
2916 struct tipc_aead_key **pkey)
2917{
2918 struct nlattr *attr = attrs[TIPC_NLA_NODE_KEY];
2919 struct tipc_aead_key *key;
2920
2921 if (!attr)
2922 return -ENODATA;
2923
2924 if (nla_len(attr) < sizeof(*key))
2925 return -EINVAL;
2926 key = (struct tipc_aead_key *)nla_data(attr);
2927 if (key->keylen > TIPC_AEAD_KEYLEN_MAX ||
2928 nla_len(attr) < tipc_aead_key_size(key))
2929 return -EINVAL;
2930
2931 *pkey = key;
2932 return 0;
2933}
2934
2935static int tipc_nl_retrieve_nodeid(struct nlattr **attrs, u8 **node_id)
2936{
2937 struct nlattr *attr = attrs[TIPC_NLA_NODE_ID];
2938
2939 if (!attr)
2940 return -ENODATA;
2941
2942 if (nla_len(attr) < TIPC_NODEID_LEN)
2943 return -EINVAL;
2944
2945 *node_id = (u8 *)nla_data(attr);
2946 return 0;
2947}
2948
2949static int tipc_nl_retrieve_rekeying(struct nlattr **attrs, u32 *intv)
2950{
2951 struct nlattr *attr = attrs[TIPC_NLA_NODE_REKEYING];
2952
2953 if (!attr)
2954 return -ENODATA;
2955
2956 *intv = nla_get_u32(attr);
2957 return 0;
2958}
2959
2960static int __tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
2961{
2962 struct nlattr *attrs[TIPC_NLA_NODE_MAX + 1];
2963 struct net *net = sock_net(skb->sk);
2964 struct tipc_crypto *tx = tipc_net(net)->crypto_tx, *c = tx;
2965 struct tipc_node *n = NULL;
2966 struct tipc_aead_key *ukey;
2967 bool rekeying = true, master_key = false;
2968 u8 *id, *own_id, mode;
2969 u32 intv = 0;
2970 int rc = 0;
2971
2972 if (!info->attrs[TIPC_NLA_NODE])
2973 return -EINVAL;
2974
2975 rc = nla_parse_nested(attrs, TIPC_NLA_NODE_MAX,
2976 info->attrs[TIPC_NLA_NODE],
2977 tipc_nl_node_policy, info->extack);
2978 if (rc)
2979 return rc;
2980
2981 own_id = tipc_own_id(net);
2982 if (!own_id) {
2983 GENL_SET_ERR_MSG(info, "not found own node identity (set id?)");
2984 return -EPERM;
2985 }
2986
2987 rc = tipc_nl_retrieve_rekeying(attrs, &intv);
2988 if (rc == -ENODATA)
2989 rekeying = false;
2990
2991 rc = tipc_nl_retrieve_key(attrs, &ukey);
2992 if (rc == -ENODATA && rekeying)
2993 goto rekeying;
2994 else if (rc)
2995 return rc;
2996
2997 rc = tipc_aead_key_validate(ukey, info);
2998 if (rc)
2999 return rc;
3000
3001 rc = tipc_nl_retrieve_nodeid(attrs, &id);
3002 switch (rc) {
3003 case -ENODATA:
3004 mode = CLUSTER_KEY;
3005 master_key = !!(attrs[TIPC_NLA_NODE_KEY_MASTER]);
3006 break;
3007 case 0:
3008 mode = PER_NODE_KEY;
3009 if (memcmp(id, own_id, NODE_ID_LEN)) {
3010 n = tipc_node_find_by_id(net, id) ?:
3011 tipc_node_create(net, 0, id, 0xffffu, 0, true);
3012 if (unlikely(!n))
3013 return -ENOMEM;
3014 c = n->crypto_rx;
3015 }
3016 break;
3017 default:
3018 return rc;
3019 }
3020
3021 /* Initiate the TX/RX key */
3022 rc = tipc_crypto_key_init(c, ukey, mode, master_key);
3023 if (n)
3024 tipc_node_put(n);
3025
3026 if (unlikely(rc < 0)) {
3027 GENL_SET_ERR_MSG(info, "unable to initiate or attach new key");
3028 return rc;
3029 } else if (c == tx) {
3030 /* Distribute TX key but not master one */
3031 if (!master_key && tipc_crypto_key_distr(tx, rc, NULL))
3032 GENL_SET_ERR_MSG(info, "failed to replicate new key");
3033rekeying:
3034 /* Schedule TX rekeying if needed */
3035 tipc_crypto_rekeying_sched(tx, rekeying, intv);
3036 }
3037
3038 return 0;
3039}
3040
3041int tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
3042{
3043 int err;
3044
3045 rtnl_lock();
3046 err = __tipc_nl_node_set_key(skb, info);
3047 rtnl_unlock();
3048
3049 return err;
3050}
3051
3052static int __tipc_nl_node_flush_key(struct sk_buff *skb,
3053 struct genl_info *info)
3054{
3055 struct net *net = sock_net(skb->sk);
3056 struct tipc_net *tn = tipc_net(net);
3057 struct tipc_node *n;
3058
3059 tipc_crypto_key_flush(tn->crypto_tx);
3060 rcu_read_lock();
3061 list_for_each_entry_rcu(n, &tn->node_list, list)
3062 tipc_crypto_key_flush(n->crypto_rx);
3063 rcu_read_unlock();
3064
3065 return 0;
3066}
3067
3068int tipc_nl_node_flush_key(struct sk_buff *skb, struct genl_info *info)
3069{
3070 int err;
3071
3072 rtnl_lock();
3073 err = __tipc_nl_node_flush_key(skb, info);
3074 rtnl_unlock();
3075
3076 return err;
3077}
3078#endif
3079
3080/**
3081 * tipc_node_dump - dump TIPC node data
3082 * @n: tipc node to be dumped
3083 * @more: dump more?
3084 * - false: dump only tipc node data
3085 * - true: dump node link data as well
3086 * @buf: returned buffer of dump data in format
3087 */
3088int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
3089{
3090 int i = 0;
3091 size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
3092
3093 if (!n) {
3094 i += scnprintf(buf, sz, "node data: (null)\n");
3095 return i;
3096 }
3097
3098 i += scnprintf(buf, sz, "node data: %x", n->addr);
3099 i += scnprintf(buf + i, sz - i, " %x", n->state);
3100 i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
3101 i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
3102 i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
3103 i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
3104 i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
3105 i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
3106 i += scnprintf(buf + i, sz - i, " %u", n->working_links);
3107 i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
3108 i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
3109
3110 if (!more)
3111 return i;
3112
3113 i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
3114 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
3115 i += scnprintf(buf + i, sz - i, " media: ");
3116 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
3117 i += scnprintf(buf + i, sz - i, "\n");
3118 i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
3119 i += scnprintf(buf + i, sz - i, " inputq: ");
3120 i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
3121
3122 i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
3123 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
3124 i += scnprintf(buf + i, sz - i, " media: ");
3125 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
3126 i += scnprintf(buf + i, sz - i, "\n");
3127 i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
3128 i += scnprintf(buf + i, sz - i, " inputq: ");
3129 i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
3130
3131 i += scnprintf(buf + i, sz - i, "bclink:\n ");
3132 i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
3133
3134 return i;
3135}
3136
3137void tipc_node_pre_cleanup_net(struct net *exit_net)
3138{
3139 struct tipc_node *n;
3140 struct tipc_net *tn;
3141 struct net *tmp;
3142
3143 rcu_read_lock();
3144 for_each_net_rcu(tmp) {
3145 if (tmp == exit_net)
3146 continue;
3147 tn = tipc_net(tmp);
3148 if (!tn)
3149 continue;
3150 spin_lock_bh(&tn->node_list_lock);
3151 list_for_each_entry_rcu(n, &tn->node_list, list) {
3152 if (!n->peer_net)
3153 continue;
3154 if (n->peer_net != exit_net)
3155 continue;
3156 tipc_node_write_lock(n);
3157 n->peer_net = NULL;
3158 n->peer_hash_mix = 0;
3159 tipc_node_write_unlock_fast(n);
3160 break;
3161 }
3162 spin_unlock_bh(&tn->node_list_lock);
3163 }
3164 rcu_read_unlock();
3165}