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 */
57 enum {
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
64 struct 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
72 struct 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 */
115 struct 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 */
152 enum {
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
163 enum {
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
174 static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
175 struct sk_buff_head *xmitq,
176 struct tipc_media_addr **maddr);
177 static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
178 bool delete);
179 static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
180 static void tipc_node_delete(struct tipc_node *node);
181 static void tipc_node_timeout(struct timer_list *t);
182 static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
183 static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
184 static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
185 static bool node_is_up(struct tipc_node *n);
186 static void tipc_node_delete_from_list(struct tipc_node *node);
187
188 struct tipc_sock_conn {
189 u32 port;
190 u32 peer_port;
191 u32 peer_node;
192 struct list_head list;
193 };
194
node_active_link(struct tipc_node * n,int sel)195 static 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
tipc_node_get_mtu(struct net * net,u32 addr,u32 sel,bool connected)205 int 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
tipc_node_get_id(struct net * net,u32 addr,u8 * id)230 bool 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
tipc_node_get_capabilities(struct net * net,u32 addr)251 u16 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
tipc_node_get_addr(struct tipc_node * node)264 u32 tipc_node_get_addr(struct tipc_node *node)
265 {
266 return (node) ? node->addr : 0;
267 }
268
tipc_node_get_id_str(struct tipc_node * node)269 char *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 */
tipc_node_crypto_rx(struct tipc_node * __n)280 struct tipc_crypto *tipc_node_crypto_rx(struct tipc_node *__n)
281 {
282 return (__n) ? __n->crypto_rx : NULL;
283 }
284
tipc_node_crypto_rx_by_list(struct list_head * pos)285 struct 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
tipc_node_crypto_rx_by_addr(struct net * net,u32 addr)290 struct 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
tipc_node_free(struct rcu_head * rp)299 static 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
tipc_node_kref_release(struct kref * kref)309 static 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
tipc_node_put(struct tipc_node * node)317 void tipc_node_put(struct tipc_node *node)
318 {
319 kref_put(&node->kref, tipc_node_kref_release);
320 }
321
tipc_node_get(struct tipc_node * node)322 void 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 */
tipc_node_find(struct net * net,u32 addr)330 static 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 */
tipc_node_find_by_id(struct net * net,u8 * id)352 static 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
tipc_node_read_lock(struct tipc_node * n)372 static void tipc_node_read_lock(struct tipc_node *n)
373 __acquires(n->lock)
374 {
375 read_lock_bh(&n->lock);
376 }
377
tipc_node_read_unlock(struct tipc_node * n)378 static void tipc_node_read_unlock(struct tipc_node *n)
379 __releases(n->lock)
380 {
381 read_unlock_bh(&n->lock);
382 }
383
tipc_node_write_lock(struct tipc_node * n)384 static void tipc_node_write_lock(struct tipc_node *n)
385 __acquires(n->lock)
386 {
387 write_lock_bh(&n->lock);
388 }
389
tipc_node_write_unlock_fast(struct tipc_node * n)390 static void tipc_node_write_unlock_fast(struct tipc_node *n)
391 __releases(n->lock)
392 {
393 write_unlock_bh(&n->lock);
394 }
395
tipc_node_write_unlock(struct tipc_node * n)396 static 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
tipc_node_assign_peer_net(struct tipc_node * n,u32 hash_mixes)440 static 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
tipc_node_create(struct net * net,u32 addr,u8 * peer_id,u16 capabilities,u32 hash_mixes,bool preliminary)468 struct 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
512 update:
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_obj(*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, " ");
608 exit:
609 spin_unlock_bh(&tn->node_list_lock);
610 return n;
611 }
612
tipc_node_calculate_timer(struct tipc_node * n,struct tipc_link * l)613 static 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
tipc_node_delete_from_list(struct tipc_node * node)626 static 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
tipc_node_delete(struct tipc_node * node)636 static 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 timer_delete_sync(&node->timer);
642 tipc_node_put(node);
643 }
644
tipc_node_stop(struct net * net)645 void 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
tipc_node_subscribe(struct net * net,struct list_head * subscr,u32 addr)656 void 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
tipc_node_unsubscribe(struct net * net,struct list_head * subscr,u32 addr)674 void 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
tipc_node_add_conn(struct net * net,u32 dnode,u32 port,u32 peer_port)692 int 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_obj(*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);
718 exit:
719 tipc_node_put(node);
720 return err;
721 }
722
tipc_node_remove_conn(struct net * net,u32 dnode,u32 port)723 void 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
tipc_node_clear_links(struct tipc_node * node)746 static 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 */
tipc_node_cleanup(struct tipc_node * peer)764 static 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 */
tipc_node_timeout(struct timer_list * t)801 static void tipc_node_timeout(struct timer_list *t)
802 {
803 struct tipc_node *n = timer_container_of(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 */
__tipc_node_link_up(struct tipc_node * n,int bearer_id,struct sk_buff_head * xmitq)856 static 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 */
tipc_node_link_up(struct tipc_node * n,int bearer_id,struct sk_buff_head * xmitq)925 static 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 */
tipc_node_link_failover(struct tipc_node * n,struct tipc_link * l,struct tipc_link * tnl,struct sk_buff_head * xmitq)958 static 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 */
__tipc_node_link_down(struct tipc_node * n,int * bearer_id,struct sk_buff_head * xmitq,struct tipc_media_addr ** maddr)988 static 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
tipc_node_link_down(struct tipc_node * n,int bearer_id,bool delete)1062 static 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
node_is_up(struct tipc_node * n)1097 static bool node_is_up(struct tipc_node *n)
1098 {
1099 return n->active_links[0] != INVALID_BEARER_ID;
1100 }
1101
tipc_node_is_up(struct net * net,u32 addr)1102 bool 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
tipc_node_suggest_addr(struct net * net,u32 addr)1118 static 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 */
tipc_node_try_addr(struct net * net,u8 * id,u32 addr)1133 u32 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
tipc_node_check_dest(struct net * net,u32 addr,u8 * peer_id,struct tipc_bearer * b,u16 capabilities,u32 signature,u32 hash_mixes,struct tipc_media_addr * maddr,bool * respond,bool * dupl_addr)1168 void 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 session = get_random_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));
1306 exit:
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
tipc_node_delete_links(struct net * net,int bearer_id)1313 void 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
tipc_node_reset_links(struct tipc_node * n)1325 static 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 */
tipc_node_fsm_evt(struct tipc_node * n,int evt)1340 static 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
1511 illegal_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
node_lost_contact(struct tipc_node * n,struct sk_buff_head * inputq)1516 static 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 */
tipc_node_get_linkname(struct net * net,u32 bearer_id,u32 addr,char * linkname,size_t len)1568 int 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 strscpy(linkname, tipc_link_name(link), len);
1585 err = 0;
1586 }
1587 tipc_node_read_unlock(node);
1588 exit:
1589 tipc_node_put(node);
1590 return err;
1591 }
1592
1593 /* Caller should hold node lock for the passed node */
__tipc_nl_add_node(struct tipc_nl_msg * msg,struct tipc_node * node)1594 static 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
1619 attr_msg_full:
1620 nla_nest_cancel(msg->skb, attrs);
1621 msg_full:
1622 genlmsg_cancel(msg->skb, hdr);
1623
1624 return -EMSGSIZE;
1625 }
1626
tipc_lxc_xmit(struct net * peer_net,struct sk_buff_head * list)1627 static 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 */
tipc_node_xmit(struct net * net,struct sk_buff_head * list,u32 dnode,int selector)1687 int 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 */
tipc_node_xmit_skb(struct net * net,struct sk_buff * skb,u32 dnode,u32 selector)1759 int 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 */
tipc_node_distr_xmit(struct net * net,struct sk_buff_head * xmitq)1773 int 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
tipc_node_broadcast(struct net * net,struct sk_buff * skb,int rc_dests)1786 void 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
tipc_node_mcast_rcv(struct tipc_node * n)1820 static 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
tipc_node_bc_sync_rcv(struct tipc_node * n,struct tipc_msg * hdr,int bearer_id,struct sk_buff_head * xmitq,bool * valid)1833 static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1834 int bearer_id, struct sk_buff_head *xmitq,
1835 bool *valid)
1836 {
1837 struct tipc_link *ucl;
1838 int rc;
1839
1840 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr, xmitq, valid);
1841 if (!*valid)
1842 return;
1843
1844 if (rc & TIPC_LINK_DOWN_EVT) {
1845 tipc_node_reset_links(n);
1846 return;
1847 }
1848
1849 if (!(rc & TIPC_LINK_SND_STATE))
1850 return;
1851
1852 /* If probe message, a STATE response will be sent anyway */
1853 if (msg_probe(hdr))
1854 return;
1855
1856 /* Produce a STATE message carrying broadcast NACK */
1857 tipc_node_read_lock(n);
1858 ucl = n->links[bearer_id].link;
1859 if (ucl)
1860 tipc_link_build_state_msg(ucl, xmitq);
1861 tipc_node_read_unlock(n);
1862 }
1863
1864 /**
1865 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1866 * @net: the applicable net namespace
1867 * @skb: TIPC packet
1868 * @bearer_id: id of bearer message arrived on
1869 *
1870 * Invoked with no locks held.
1871 */
tipc_node_bc_rcv(struct net * net,struct sk_buff * skb,int bearer_id)1872 static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1873 {
1874 int rc;
1875 struct sk_buff_head xmitq;
1876 struct tipc_bclink_entry *be;
1877 struct tipc_link_entry *le;
1878 struct tipc_msg *hdr = buf_msg(skb);
1879 int usr = msg_user(hdr);
1880 u32 dnode = msg_destnode(hdr);
1881 struct tipc_node *n;
1882
1883 __skb_queue_head_init(&xmitq);
1884
1885 /* If NACK for other node, let rcv link for that node peek into it */
1886 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1887 n = tipc_node_find(net, dnode);
1888 else
1889 n = tipc_node_find(net, msg_prevnode(hdr));
1890 if (!n) {
1891 kfree_skb(skb);
1892 return;
1893 }
1894 be = &n->bc_entry;
1895 le = &n->links[bearer_id];
1896
1897 rc = tipc_bcast_rcv(net, be->link, skb);
1898
1899 /* Broadcast ACKs are sent on a unicast link */
1900 if (rc & TIPC_LINK_SND_STATE) {
1901 tipc_node_read_lock(n);
1902 tipc_link_build_state_msg(le->link, &xmitq);
1903 tipc_node_read_unlock(n);
1904 }
1905
1906 if (!skb_queue_empty(&xmitq))
1907 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1908
1909 if (!skb_queue_empty(&be->inputq1))
1910 tipc_node_mcast_rcv(n);
1911
1912 /* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
1913 if (!skb_queue_empty(&n->bc_entry.namedq))
1914 tipc_named_rcv(net, &n->bc_entry.namedq,
1915 &n->bc_entry.named_rcv_nxt,
1916 &n->bc_entry.named_open);
1917
1918 /* If reassembly or retransmission failure => reset all links to peer */
1919 if (rc & TIPC_LINK_DOWN_EVT)
1920 tipc_node_reset_links(n);
1921
1922 tipc_node_put(n);
1923 }
1924
1925 /**
1926 * tipc_node_check_state - check and if necessary update node state
1927 * @n: target tipc_node
1928 * @skb: TIPC packet
1929 * @bearer_id: identity of bearer delivering the packet
1930 * @xmitq: queue for messages to be xmited on
1931 * Return: true if state and msg are ok, otherwise false
1932 */
tipc_node_check_state(struct tipc_node * n,struct sk_buff * skb,int bearer_id,struct sk_buff_head * xmitq)1933 static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1934 int bearer_id, struct sk_buff_head *xmitq)
1935 {
1936 struct tipc_msg *hdr = buf_msg(skb);
1937 int usr = msg_user(hdr);
1938 int mtyp = msg_type(hdr);
1939 u16 oseqno = msg_seqno(hdr);
1940 u16 exp_pkts = msg_msgcnt(hdr);
1941 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1942 int state = n->state;
1943 struct tipc_link *l, *tnl, *pl = NULL;
1944 struct tipc_media_addr *maddr;
1945 int pb_id;
1946
1947 if (trace_tipc_node_check_state_enabled()) {
1948 trace_tipc_skb_dump(skb, false, "skb for node state check");
1949 trace_tipc_node_check_state(n, true, " ");
1950 }
1951 l = n->links[bearer_id].link;
1952 if (!l)
1953 return false;
1954 rcv_nxt = tipc_link_rcv_nxt(l);
1955
1956
1957 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1958 return true;
1959
1960 /* Find parallel link, if any */
1961 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1962 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1963 pl = n->links[pb_id].link;
1964 break;
1965 }
1966 }
1967
1968 if (!tipc_link_validate_msg(l, hdr)) {
1969 trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
1970 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
1971 return false;
1972 }
1973
1974 /* Check and update node accesibility if applicable */
1975 if (state == SELF_UP_PEER_COMING) {
1976 if (!tipc_link_is_up(l))
1977 return true;
1978 if (!msg_peer_link_is_up(hdr))
1979 return true;
1980 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1981 }
1982
1983 if (state == SELF_DOWN_PEER_LEAVING) {
1984 if (msg_peer_node_is_up(hdr))
1985 return false;
1986 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1987 return true;
1988 }
1989
1990 if (state == SELF_LEAVING_PEER_DOWN)
1991 return false;
1992
1993 /* Ignore duplicate packets */
1994 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1995 return true;
1996
1997 /* Initiate or update failover mode if applicable */
1998 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1999 syncpt = oseqno + exp_pkts - 1;
2000 if (pl && !tipc_link_is_reset(pl)) {
2001 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
2002 trace_tipc_node_link_down(n, true,
2003 "node link down <- failover!");
2004 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
2005 tipc_link_inputq(l));
2006 }
2007
2008 /* If parallel link was already down, and this happened before
2009 * the tunnel link came up, node failover was never started.
2010 * Ensure that a FAILOVER_MSG is sent to get peer out of
2011 * NODE_FAILINGOVER state, also this node must accept
2012 * TUNNEL_MSGs from peer.
2013 */
2014 if (n->state != NODE_FAILINGOVER)
2015 tipc_node_link_failover(n, pl, l, xmitq);
2016
2017 /* If pkts arrive out of order, use lowest calculated syncpt */
2018 if (less(syncpt, n->sync_point))
2019 n->sync_point = syncpt;
2020 }
2021
2022 /* Open parallel link when tunnel link reaches synch point */
2023 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
2024 if (!more(rcv_nxt, n->sync_point))
2025 return true;
2026 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
2027 if (pl)
2028 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
2029 return true;
2030 }
2031
2032 /* No syncing needed if only one link */
2033 if (!pl || !tipc_link_is_up(pl))
2034 return true;
2035
2036 /* Initiate synch mode if applicable */
2037 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
2038 if (n->capabilities & TIPC_TUNNEL_ENHANCED)
2039 syncpt = msg_syncpt(hdr);
2040 else
2041 syncpt = msg_seqno(msg_inner_hdr(hdr)) + exp_pkts - 1;
2042 if (!tipc_link_is_up(l))
2043 __tipc_node_link_up(n, bearer_id, xmitq);
2044 if (n->state == SELF_UP_PEER_UP) {
2045 n->sync_point = syncpt;
2046 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
2047 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
2048 }
2049 }
2050
2051 /* Open tunnel link when parallel link reaches synch point */
2052 if (n->state == NODE_SYNCHING) {
2053 if (tipc_link_is_synching(l)) {
2054 tnl = l;
2055 } else {
2056 tnl = pl;
2057 pl = l;
2058 }
2059 inputq_len = skb_queue_len(tipc_link_inputq(pl));
2060 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
2061 if (more(dlv_nxt, n->sync_point)) {
2062 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
2063 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
2064 return true;
2065 }
2066 if (l == pl)
2067 return true;
2068 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
2069 return true;
2070 if (usr == LINK_PROTOCOL)
2071 return true;
2072 return false;
2073 }
2074 return true;
2075 }
2076
2077 /**
2078 * tipc_rcv - process TIPC packets/messages arriving from off-node
2079 * @net: the applicable net namespace
2080 * @skb: TIPC packet
2081 * @b: pointer to bearer message arrived on
2082 *
2083 * Invoked with no locks held. Bearer pointer must point to a valid bearer
2084 * structure (i.e. cannot be NULL), but bearer can be inactive.
2085 */
tipc_rcv(struct net * net,struct sk_buff * skb,struct tipc_bearer * b)2086 void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
2087 {
2088 struct sk_buff_head xmitq;
2089 struct tipc_link_entry *le;
2090 struct tipc_msg *hdr;
2091 struct tipc_node *n;
2092 int bearer_id = b->identity;
2093 u32 self = tipc_own_addr(net);
2094 int usr, rc = 0;
2095 u16 bc_ack;
2096 #ifdef CONFIG_TIPC_CRYPTO
2097 struct tipc_ehdr *ehdr;
2098
2099 /* Check if message must be decrypted first */
2100 if (TIPC_SKB_CB(skb)->decrypted || !tipc_ehdr_validate(skb))
2101 goto rcv;
2102
2103 ehdr = (struct tipc_ehdr *)skb->data;
2104 if (likely(ehdr->user != LINK_CONFIG)) {
2105 n = tipc_node_find(net, ntohl(ehdr->addr));
2106 if (unlikely(!n))
2107 goto discard;
2108 } else {
2109 n = tipc_node_find_by_id(net, ehdr->id);
2110 }
2111 skb_dst_force(skb);
2112 tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b);
2113 if (!skb)
2114 return;
2115
2116 rcv:
2117 #endif
2118 /* Ensure message is well-formed before touching the header */
2119 if (unlikely(!tipc_msg_validate(&skb)))
2120 goto discard;
2121 __skb_queue_head_init(&xmitq);
2122 hdr = buf_msg(skb);
2123 usr = msg_user(hdr);
2124 bc_ack = msg_bcast_ack(hdr);
2125
2126 /* Handle arrival of discovery or broadcast packet */
2127 if (unlikely(msg_non_seq(hdr))) {
2128 if (unlikely(usr == LINK_CONFIG))
2129 return tipc_disc_rcv(net, skb, b);
2130 else
2131 return tipc_node_bc_rcv(net, skb, bearer_id);
2132 }
2133
2134 /* Discard unicast link messages destined for another node */
2135 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
2136 goto discard;
2137
2138 /* Locate neighboring node that sent packet */
2139 n = tipc_node_find(net, msg_prevnode(hdr));
2140 if (unlikely(!n))
2141 goto discard;
2142 le = &n->links[bearer_id];
2143
2144 /* Ensure broadcast reception is in synch with peer's send state */
2145 if (unlikely(usr == LINK_PROTOCOL)) {
2146 bool valid = true;
2147
2148 if (unlikely(skb_linearize(skb))) {
2149 tipc_node_put(n);
2150 goto discard;
2151 }
2152 hdr = buf_msg(skb);
2153 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq, &valid);
2154 if (!valid) {
2155 tipc_node_put(n);
2156 goto discard;
2157 }
2158 } else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack)) {
2159 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
2160 }
2161
2162 /* Receive packet directly if conditions permit */
2163 tipc_node_read_lock(n);
2164 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
2165 spin_lock_bh(&le->lock);
2166 if (le->link) {
2167 rc = tipc_link_rcv(le->link, skb, &xmitq);
2168 skb = NULL;
2169 }
2170 spin_unlock_bh(&le->lock);
2171 }
2172 tipc_node_read_unlock(n);
2173
2174 /* Check/update node state before receiving */
2175 if (unlikely(skb)) {
2176 if (unlikely(skb_linearize(skb)))
2177 goto out_node_put;
2178 tipc_node_write_lock(n);
2179 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
2180 if (le->link) {
2181 rc = tipc_link_rcv(le->link, skb, &xmitq);
2182 skb = NULL;
2183 }
2184 }
2185 tipc_node_write_unlock(n);
2186 }
2187
2188 if (unlikely(rc & TIPC_LINK_UP_EVT))
2189 tipc_node_link_up(n, bearer_id, &xmitq);
2190
2191 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
2192 tipc_node_link_down(n, bearer_id, false);
2193
2194 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
2195 tipc_named_rcv(net, &n->bc_entry.namedq,
2196 &n->bc_entry.named_rcv_nxt,
2197 &n->bc_entry.named_open);
2198
2199 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
2200 tipc_node_mcast_rcv(n);
2201
2202 if (!skb_queue_empty(&le->inputq))
2203 tipc_sk_rcv(net, &le->inputq);
2204
2205 if (!skb_queue_empty(&xmitq))
2206 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
2207
2208 out_node_put:
2209 tipc_node_put(n);
2210 discard:
2211 kfree_skb(skb);
2212 }
2213
tipc_node_apply_property(struct net * net,struct tipc_bearer * b,int prop)2214 void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
2215 int prop)
2216 {
2217 struct tipc_net *tn = tipc_net(net);
2218 int bearer_id = b->identity;
2219 struct sk_buff_head xmitq;
2220 struct tipc_link_entry *e;
2221 struct tipc_node *n;
2222
2223 __skb_queue_head_init(&xmitq);
2224
2225 rcu_read_lock();
2226
2227 list_for_each_entry_rcu(n, &tn->node_list, list) {
2228 tipc_node_write_lock(n);
2229 e = &n->links[bearer_id];
2230 if (e->link) {
2231 if (prop == TIPC_NLA_PROP_TOL)
2232 tipc_link_set_tolerance(e->link, b->tolerance,
2233 &xmitq);
2234 else if (prop == TIPC_NLA_PROP_MTU)
2235 tipc_link_set_mtu(e->link, b->mtu);
2236
2237 /* Update MTU for node link entry */
2238 e->mtu = tipc_link_mss(e->link);
2239 }
2240
2241 tipc_node_write_unlock(n);
2242 tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
2243 }
2244
2245 rcu_read_unlock();
2246 }
2247
tipc_nl_peer_rm(struct sk_buff * skb,struct genl_info * info)2248 int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
2249 {
2250 struct net *net = sock_net(skb->sk);
2251 struct tipc_net *tn = net_generic(net, tipc_net_id);
2252 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
2253 struct tipc_node *peer, *temp_node;
2254 u8 node_id[NODE_ID_LEN];
2255 u64 *w0 = (u64 *)&node_id[0];
2256 u64 *w1 = (u64 *)&node_id[8];
2257 u32 addr;
2258 int err;
2259
2260 /* We identify the peer by its net */
2261 if (!info->attrs[TIPC_NLA_NET])
2262 return -EINVAL;
2263
2264 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
2265 info->attrs[TIPC_NLA_NET],
2266 tipc_nl_net_policy, info->extack);
2267 if (err)
2268 return err;
2269
2270 /* attrs[TIPC_NLA_NET_NODEID] and attrs[TIPC_NLA_NET_ADDR] are
2271 * mutually exclusive cases
2272 */
2273 if (attrs[TIPC_NLA_NET_ADDR]) {
2274 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
2275 if (!addr)
2276 return -EINVAL;
2277 }
2278
2279 if (attrs[TIPC_NLA_NET_NODEID]) {
2280 if (!attrs[TIPC_NLA_NET_NODEID_W1])
2281 return -EINVAL;
2282 *w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
2283 *w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
2284 addr = hash128to32(node_id);
2285 }
2286
2287 if (in_own_node(net, addr))
2288 return -ENOTSUPP;
2289
2290 spin_lock_bh(&tn->node_list_lock);
2291 peer = tipc_node_find(net, addr);
2292 if (!peer) {
2293 spin_unlock_bh(&tn->node_list_lock);
2294 return -ENXIO;
2295 }
2296
2297 tipc_node_write_lock(peer);
2298 if (peer->state != SELF_DOWN_PEER_DOWN &&
2299 peer->state != SELF_DOWN_PEER_LEAVING) {
2300 tipc_node_write_unlock(peer);
2301 err = -EBUSY;
2302 goto err_out;
2303 }
2304
2305 tipc_node_clear_links(peer);
2306 tipc_node_write_unlock(peer);
2307 tipc_node_delete(peer);
2308
2309 /* Calculate cluster capabilities */
2310 tn->capabilities = TIPC_NODE_CAPABILITIES;
2311 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
2312 tn->capabilities &= temp_node->capabilities;
2313 }
2314 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
2315 err = 0;
2316 err_out:
2317 tipc_node_put(peer);
2318 spin_unlock_bh(&tn->node_list_lock);
2319
2320 return err;
2321 }
2322
tipc_nl_node_dump(struct sk_buff * skb,struct netlink_callback * cb)2323 int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
2324 {
2325 int err;
2326 struct net *net = sock_net(skb->sk);
2327 struct tipc_net *tn = net_generic(net, tipc_net_id);
2328 int done = cb->args[0];
2329 int last_addr = cb->args[1];
2330 struct tipc_node *node;
2331 struct tipc_nl_msg msg;
2332
2333 if (done)
2334 return 0;
2335
2336 msg.skb = skb;
2337 msg.portid = NETLINK_CB(cb->skb).portid;
2338 msg.seq = cb->nlh->nlmsg_seq;
2339
2340 rcu_read_lock();
2341 if (last_addr) {
2342 node = tipc_node_find(net, last_addr);
2343 if (!node) {
2344 rcu_read_unlock();
2345 /* We never set seq or call nl_dump_check_consistent()
2346 * this means that setting prev_seq here will cause the
2347 * consistence check to fail in the netlink callback
2348 * handler. Resulting in the NLMSG_DONE message having
2349 * the NLM_F_DUMP_INTR flag set if the node state
2350 * changed while we released the lock.
2351 */
2352 cb->prev_seq = 1;
2353 return -EPIPE;
2354 }
2355 tipc_node_put(node);
2356 }
2357
2358 list_for_each_entry_rcu(node, &tn->node_list, list) {
2359 if (node->preliminary)
2360 continue;
2361 if (last_addr) {
2362 if (node->addr == last_addr)
2363 last_addr = 0;
2364 else
2365 continue;
2366 }
2367
2368 tipc_node_read_lock(node);
2369 err = __tipc_nl_add_node(&msg, node);
2370 if (err) {
2371 last_addr = node->addr;
2372 tipc_node_read_unlock(node);
2373 goto out;
2374 }
2375
2376 tipc_node_read_unlock(node);
2377 }
2378 done = 1;
2379 out:
2380 cb->args[0] = done;
2381 cb->args[1] = last_addr;
2382 rcu_read_unlock();
2383
2384 return skb->len;
2385 }
2386
2387 /* tipc_node_find_by_name - locate owner node of link by link's name
2388 * @net: the applicable net namespace
2389 * @name: pointer to link name string
2390 * @bearer_id: pointer to index in 'node->links' array where the link was found.
2391 *
2392 * Returns pointer to node owning the link, or 0 if no matching link is found.
2393 */
tipc_node_find_by_name(struct net * net,const char * link_name,unsigned int * bearer_id)2394 static struct tipc_node *tipc_node_find_by_name(struct net *net,
2395 const char *link_name,
2396 unsigned int *bearer_id)
2397 {
2398 struct tipc_net *tn = net_generic(net, tipc_net_id);
2399 struct tipc_link *l;
2400 struct tipc_node *n;
2401 struct tipc_node *found_node = NULL;
2402 int i;
2403
2404 *bearer_id = 0;
2405 rcu_read_lock();
2406 list_for_each_entry_rcu(n, &tn->node_list, list) {
2407 tipc_node_read_lock(n);
2408 for (i = 0; i < MAX_BEARERS; i++) {
2409 l = n->links[i].link;
2410 if (l && !strcmp(tipc_link_name(l), link_name)) {
2411 *bearer_id = i;
2412 found_node = n;
2413 break;
2414 }
2415 }
2416 tipc_node_read_unlock(n);
2417 if (found_node)
2418 break;
2419 }
2420 rcu_read_unlock();
2421
2422 return found_node;
2423 }
2424
tipc_nl_node_set_link(struct sk_buff * skb,struct genl_info * info)2425 int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
2426 {
2427 int err;
2428 int res = 0;
2429 int bearer_id;
2430 char *name;
2431 struct tipc_link *link;
2432 struct tipc_node *node;
2433 struct sk_buff_head xmitq;
2434 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2435 struct net *net = sock_net(skb->sk);
2436
2437 __skb_queue_head_init(&xmitq);
2438
2439 if (!info->attrs[TIPC_NLA_LINK])
2440 return -EINVAL;
2441
2442 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2443 info->attrs[TIPC_NLA_LINK],
2444 tipc_nl_link_policy, info->extack);
2445 if (err)
2446 return err;
2447
2448 if (!attrs[TIPC_NLA_LINK_NAME])
2449 return -EINVAL;
2450
2451 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2452
2453 if (strcmp(name, tipc_bclink_name) == 0)
2454 return tipc_nl_bc_link_set(net, attrs);
2455
2456 node = tipc_node_find_by_name(net, name, &bearer_id);
2457 if (!node)
2458 return -EINVAL;
2459
2460 tipc_node_read_lock(node);
2461
2462 link = node->links[bearer_id].link;
2463 if (!link) {
2464 res = -EINVAL;
2465 goto out;
2466 }
2467
2468 if (attrs[TIPC_NLA_LINK_PROP]) {
2469 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2470
2471 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
2472 if (err) {
2473 res = err;
2474 goto out;
2475 }
2476
2477 if (props[TIPC_NLA_PROP_TOL]) {
2478 u32 tol;
2479
2480 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2481 tipc_link_set_tolerance(link, tol, &xmitq);
2482 }
2483 if (props[TIPC_NLA_PROP_PRIO]) {
2484 u32 prio;
2485
2486 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2487 tipc_link_set_prio(link, prio, &xmitq);
2488 }
2489 if (props[TIPC_NLA_PROP_WIN]) {
2490 u32 max_win;
2491
2492 max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2493 tipc_link_set_queue_limits(link,
2494 tipc_link_min_win(link),
2495 max_win);
2496 }
2497 }
2498
2499 out:
2500 tipc_node_read_unlock(node);
2501 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr,
2502 NULL);
2503 return res;
2504 }
2505
tipc_nl_node_get_link(struct sk_buff * skb,struct genl_info * info)2506 int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
2507 {
2508 struct net *net = genl_info_net(info);
2509 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2510 struct tipc_nl_msg msg;
2511 char *name;
2512 int err;
2513
2514 msg.portid = info->snd_portid;
2515 msg.seq = info->snd_seq;
2516
2517 if (!info->attrs[TIPC_NLA_LINK])
2518 return -EINVAL;
2519
2520 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2521 info->attrs[TIPC_NLA_LINK],
2522 tipc_nl_link_policy, info->extack);
2523 if (err)
2524 return err;
2525
2526 if (!attrs[TIPC_NLA_LINK_NAME])
2527 return -EINVAL;
2528
2529 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2530
2531 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2532 if (!msg.skb)
2533 return -ENOMEM;
2534
2535 if (strcmp(name, tipc_bclink_name) == 0) {
2536 err = tipc_nl_add_bc_link(net, &msg, tipc_net(net)->bcl);
2537 if (err)
2538 goto err_free;
2539 } else {
2540 int bearer_id;
2541 struct tipc_node *node;
2542 struct tipc_link *link;
2543
2544 node = tipc_node_find_by_name(net, name, &bearer_id);
2545 if (!node) {
2546 err = -EINVAL;
2547 goto err_free;
2548 }
2549
2550 tipc_node_read_lock(node);
2551 link = node->links[bearer_id].link;
2552 if (!link) {
2553 tipc_node_read_unlock(node);
2554 err = -EINVAL;
2555 goto err_free;
2556 }
2557
2558 err = __tipc_nl_add_link(net, &msg, link, 0);
2559 tipc_node_read_unlock(node);
2560 if (err)
2561 goto err_free;
2562 }
2563
2564 return genlmsg_reply(msg.skb, info);
2565
2566 err_free:
2567 nlmsg_free(msg.skb);
2568 return err;
2569 }
2570
tipc_nl_node_reset_link_stats(struct sk_buff * skb,struct genl_info * info)2571 int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2572 {
2573 int err;
2574 char *link_name;
2575 unsigned int bearer_id;
2576 struct tipc_link *link;
2577 struct tipc_node *node;
2578 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2579 struct net *net = sock_net(skb->sk);
2580 struct tipc_net *tn = tipc_net(net);
2581 struct tipc_link_entry *le;
2582
2583 if (!info->attrs[TIPC_NLA_LINK])
2584 return -EINVAL;
2585
2586 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2587 info->attrs[TIPC_NLA_LINK],
2588 tipc_nl_link_policy, info->extack);
2589 if (err)
2590 return err;
2591
2592 if (!attrs[TIPC_NLA_LINK_NAME])
2593 return -EINVAL;
2594
2595 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2596
2597 err = -EINVAL;
2598 if (!strcmp(link_name, tipc_bclink_name)) {
2599 err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
2600 if (err)
2601 return err;
2602 return 0;
2603 } else if (strstr(link_name, tipc_bclink_name)) {
2604 rcu_read_lock();
2605 list_for_each_entry_rcu(node, &tn->node_list, list) {
2606 tipc_node_read_lock(node);
2607 link = node->bc_entry.link;
2608 if (link && !strcmp(link_name, tipc_link_name(link))) {
2609 err = tipc_bclink_reset_stats(net, link);
2610 tipc_node_read_unlock(node);
2611 break;
2612 }
2613 tipc_node_read_unlock(node);
2614 }
2615 rcu_read_unlock();
2616 return err;
2617 }
2618
2619 node = tipc_node_find_by_name(net, link_name, &bearer_id);
2620 if (!node)
2621 return -EINVAL;
2622
2623 le = &node->links[bearer_id];
2624 tipc_node_read_lock(node);
2625 spin_lock_bh(&le->lock);
2626 link = node->links[bearer_id].link;
2627 if (!link) {
2628 spin_unlock_bh(&le->lock);
2629 tipc_node_read_unlock(node);
2630 return -EINVAL;
2631 }
2632 tipc_link_reset_stats(link);
2633 spin_unlock_bh(&le->lock);
2634 tipc_node_read_unlock(node);
2635 return 0;
2636 }
2637
2638 /* Caller should hold node lock */
__tipc_nl_add_node_links(struct net * net,struct tipc_nl_msg * msg,struct tipc_node * node,u32 * prev_link,bool bc_link)2639 static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2640 struct tipc_node *node, u32 *prev_link,
2641 bool bc_link)
2642 {
2643 u32 i;
2644 int err;
2645
2646 for (i = *prev_link; i < MAX_BEARERS; i++) {
2647 *prev_link = i;
2648
2649 if (!node->links[i].link)
2650 continue;
2651
2652 err = __tipc_nl_add_link(net, msg,
2653 node->links[i].link, NLM_F_MULTI);
2654 if (err)
2655 return err;
2656 }
2657
2658 if (bc_link) {
2659 *prev_link = i;
2660 err = tipc_nl_add_bc_link(net, msg, node->bc_entry.link);
2661 if (err)
2662 return err;
2663 }
2664
2665 *prev_link = 0;
2666
2667 return 0;
2668 }
2669
tipc_nl_node_dump_link(struct sk_buff * skb,struct netlink_callback * cb)2670 int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2671 {
2672 struct net *net = sock_net(skb->sk);
2673 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
2674 struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
2675 struct tipc_net *tn = net_generic(net, tipc_net_id);
2676 struct tipc_node *node;
2677 struct tipc_nl_msg msg;
2678 u32 prev_node = cb->args[0];
2679 u32 prev_link = cb->args[1];
2680 int done = cb->args[2];
2681 bool bc_link = cb->args[3];
2682 int err;
2683
2684 if (done)
2685 return 0;
2686
2687 if (!prev_node) {
2688 /* Check if broadcast-receiver links dumping is needed */
2689 if (attrs && attrs[TIPC_NLA_LINK]) {
2690 err = nla_parse_nested_deprecated(link,
2691 TIPC_NLA_LINK_MAX,
2692 attrs[TIPC_NLA_LINK],
2693 tipc_nl_link_policy,
2694 NULL);
2695 if (unlikely(err))
2696 return err;
2697 if (unlikely(!link[TIPC_NLA_LINK_BROADCAST]))
2698 return -EINVAL;
2699 bc_link = true;
2700 }
2701 }
2702
2703 msg.skb = skb;
2704 msg.portid = NETLINK_CB(cb->skb).portid;
2705 msg.seq = cb->nlh->nlmsg_seq;
2706
2707 rcu_read_lock();
2708 if (prev_node) {
2709 node = tipc_node_find(net, prev_node);
2710 if (!node) {
2711 /* We never set seq or call nl_dump_check_consistent()
2712 * this means that setting prev_seq here will cause the
2713 * consistence check to fail in the netlink callback
2714 * handler. Resulting in the last NLMSG_DONE message
2715 * having the NLM_F_DUMP_INTR flag set.
2716 */
2717 cb->prev_seq = 1;
2718 goto out;
2719 }
2720 tipc_node_put(node);
2721
2722 list_for_each_entry_continue_rcu(node, &tn->node_list,
2723 list) {
2724 tipc_node_read_lock(node);
2725 err = __tipc_nl_add_node_links(net, &msg, node,
2726 &prev_link, bc_link);
2727 tipc_node_read_unlock(node);
2728 if (err)
2729 goto out;
2730
2731 prev_node = node->addr;
2732 }
2733 } else {
2734 err = tipc_nl_add_bc_link(net, &msg, tn->bcl);
2735 if (err)
2736 goto out;
2737
2738 list_for_each_entry_rcu(node, &tn->node_list, list) {
2739 tipc_node_read_lock(node);
2740 err = __tipc_nl_add_node_links(net, &msg, node,
2741 &prev_link, bc_link);
2742 tipc_node_read_unlock(node);
2743 if (err)
2744 goto out;
2745
2746 prev_node = node->addr;
2747 }
2748 }
2749 done = 1;
2750 out:
2751 rcu_read_unlock();
2752
2753 cb->args[0] = prev_node;
2754 cb->args[1] = prev_link;
2755 cb->args[2] = done;
2756 cb->args[3] = bc_link;
2757
2758 return skb->len;
2759 }
2760
tipc_nl_node_set_monitor(struct sk_buff * skb,struct genl_info * info)2761 int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2762 {
2763 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2764 struct net *net = sock_net(skb->sk);
2765 int err;
2766
2767 if (!info->attrs[TIPC_NLA_MON])
2768 return -EINVAL;
2769
2770 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
2771 info->attrs[TIPC_NLA_MON],
2772 tipc_nl_monitor_policy,
2773 info->extack);
2774 if (err)
2775 return err;
2776
2777 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2778 u32 val;
2779
2780 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2781 err = tipc_nl_monitor_set_threshold(net, val);
2782 if (err)
2783 return err;
2784 }
2785
2786 return 0;
2787 }
2788
__tipc_nl_add_monitor_prop(struct net * net,struct tipc_nl_msg * msg)2789 static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2790 {
2791 struct nlattr *attrs;
2792 void *hdr;
2793 u32 val;
2794
2795 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2796 0, TIPC_NL_MON_GET);
2797 if (!hdr)
2798 return -EMSGSIZE;
2799
2800 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
2801 if (!attrs)
2802 goto msg_full;
2803
2804 val = tipc_nl_monitor_get_threshold(net);
2805
2806 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2807 goto attr_msg_full;
2808
2809 nla_nest_end(msg->skb, attrs);
2810 genlmsg_end(msg->skb, hdr);
2811
2812 return 0;
2813
2814 attr_msg_full:
2815 nla_nest_cancel(msg->skb, attrs);
2816 msg_full:
2817 genlmsg_cancel(msg->skb, hdr);
2818
2819 return -EMSGSIZE;
2820 }
2821
tipc_nl_node_get_monitor(struct sk_buff * skb,struct genl_info * info)2822 int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2823 {
2824 struct net *net = sock_net(skb->sk);
2825 struct tipc_nl_msg msg;
2826 int err;
2827
2828 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2829 if (!msg.skb)
2830 return -ENOMEM;
2831 msg.portid = info->snd_portid;
2832 msg.seq = info->snd_seq;
2833
2834 err = __tipc_nl_add_monitor_prop(net, &msg);
2835 if (err) {
2836 nlmsg_free(msg.skb);
2837 return err;
2838 }
2839
2840 return genlmsg_reply(msg.skb, info);
2841 }
2842
tipc_nl_node_dump_monitor(struct sk_buff * skb,struct netlink_callback * cb)2843 int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2844 {
2845 struct net *net = sock_net(skb->sk);
2846 u32 prev_bearer = cb->args[0];
2847 struct tipc_nl_msg msg;
2848 int bearer_id;
2849 int err;
2850
2851 if (prev_bearer == MAX_BEARERS)
2852 return 0;
2853
2854 msg.skb = skb;
2855 msg.portid = NETLINK_CB(cb->skb).portid;
2856 msg.seq = cb->nlh->nlmsg_seq;
2857
2858 rtnl_lock();
2859 for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2860 err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2861 if (err)
2862 break;
2863 }
2864 rtnl_unlock();
2865 cb->args[0] = bearer_id;
2866
2867 return skb->len;
2868 }
2869
tipc_nl_node_dump_monitor_peer(struct sk_buff * skb,struct netlink_callback * cb)2870 int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2871 struct netlink_callback *cb)
2872 {
2873 struct net *net = sock_net(skb->sk);
2874 u32 prev_node = cb->args[1];
2875 u32 bearer_id = cb->args[2];
2876 int done = cb->args[0];
2877 struct tipc_nl_msg msg;
2878 int err;
2879
2880 if (!prev_node) {
2881 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
2882 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2883
2884 if (!attrs[TIPC_NLA_MON])
2885 return -EINVAL;
2886
2887 err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
2888 attrs[TIPC_NLA_MON],
2889 tipc_nl_monitor_policy,
2890 NULL);
2891 if (err)
2892 return err;
2893
2894 if (!mon[TIPC_NLA_MON_REF])
2895 return -EINVAL;
2896
2897 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2898
2899 if (bearer_id >= MAX_BEARERS)
2900 return -EINVAL;
2901 }
2902
2903 if (done)
2904 return 0;
2905
2906 msg.skb = skb;
2907 msg.portid = NETLINK_CB(cb->skb).portid;
2908 msg.seq = cb->nlh->nlmsg_seq;
2909
2910 rtnl_lock();
2911 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2912 if (!err)
2913 done = 1;
2914
2915 rtnl_unlock();
2916 cb->args[0] = done;
2917 cb->args[1] = prev_node;
2918 cb->args[2] = bearer_id;
2919
2920 return skb->len;
2921 }
2922
2923 #ifdef CONFIG_TIPC_CRYPTO
tipc_nl_retrieve_key(struct nlattr ** attrs,struct tipc_aead_key ** pkey)2924 static int tipc_nl_retrieve_key(struct nlattr **attrs,
2925 struct tipc_aead_key **pkey)
2926 {
2927 struct nlattr *attr = attrs[TIPC_NLA_NODE_KEY];
2928 struct tipc_aead_key *key;
2929
2930 if (!attr)
2931 return -ENODATA;
2932
2933 if (nla_len(attr) < sizeof(*key))
2934 return -EINVAL;
2935 key = (struct tipc_aead_key *)nla_data(attr);
2936 if (key->keylen > TIPC_AEAD_KEYLEN_MAX ||
2937 nla_len(attr) < tipc_aead_key_size(key))
2938 return -EINVAL;
2939
2940 *pkey = key;
2941 return 0;
2942 }
2943
tipc_nl_retrieve_nodeid(struct nlattr ** attrs,u8 ** node_id)2944 static int tipc_nl_retrieve_nodeid(struct nlattr **attrs, u8 **node_id)
2945 {
2946 struct nlattr *attr = attrs[TIPC_NLA_NODE_ID];
2947
2948 if (!attr)
2949 return -ENODATA;
2950
2951 if (nla_len(attr) < TIPC_NODEID_LEN)
2952 return -EINVAL;
2953
2954 *node_id = (u8 *)nla_data(attr);
2955 return 0;
2956 }
2957
tipc_nl_retrieve_rekeying(struct nlattr ** attrs,u32 * intv)2958 static int tipc_nl_retrieve_rekeying(struct nlattr **attrs, u32 *intv)
2959 {
2960 struct nlattr *attr = attrs[TIPC_NLA_NODE_REKEYING];
2961
2962 if (!attr)
2963 return -ENODATA;
2964
2965 *intv = nla_get_u32(attr);
2966 return 0;
2967 }
2968
__tipc_nl_node_set_key(struct sk_buff * skb,struct genl_info * info)2969 static int __tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
2970 {
2971 struct nlattr *attrs[TIPC_NLA_NODE_MAX + 1];
2972 struct net *net = sock_net(skb->sk);
2973 struct tipc_crypto *tx = tipc_net(net)->crypto_tx, *c = tx;
2974 struct tipc_node *n = NULL;
2975 struct tipc_aead_key *ukey;
2976 bool rekeying = true, master_key = false;
2977 u8 *id, *own_id, mode;
2978 u32 intv = 0;
2979 int rc = 0;
2980
2981 if (!info->attrs[TIPC_NLA_NODE])
2982 return -EINVAL;
2983
2984 rc = nla_parse_nested(attrs, TIPC_NLA_NODE_MAX,
2985 info->attrs[TIPC_NLA_NODE],
2986 tipc_nl_node_policy, info->extack);
2987 if (rc)
2988 return rc;
2989
2990 own_id = tipc_own_id(net);
2991 if (!own_id) {
2992 GENL_SET_ERR_MSG(info, "not found own node identity (set id?)");
2993 return -EPERM;
2994 }
2995
2996 rc = tipc_nl_retrieve_rekeying(attrs, &intv);
2997 if (rc == -ENODATA)
2998 rekeying = false;
2999
3000 rc = tipc_nl_retrieve_key(attrs, &ukey);
3001 if (rc == -ENODATA && rekeying)
3002 goto rekeying;
3003 else if (rc)
3004 return rc;
3005
3006 rc = tipc_aead_key_validate(ukey, info);
3007 if (rc)
3008 return rc;
3009
3010 rc = tipc_nl_retrieve_nodeid(attrs, &id);
3011 switch (rc) {
3012 case -ENODATA:
3013 mode = CLUSTER_KEY;
3014 master_key = !!(attrs[TIPC_NLA_NODE_KEY_MASTER]);
3015 break;
3016 case 0:
3017 mode = PER_NODE_KEY;
3018 if (memcmp(id, own_id, NODE_ID_LEN)) {
3019 n = tipc_node_find_by_id(net, id) ?:
3020 tipc_node_create(net, 0, id, 0xffffu, 0, true);
3021 if (unlikely(!n))
3022 return -ENOMEM;
3023 c = n->crypto_rx;
3024 }
3025 break;
3026 default:
3027 return rc;
3028 }
3029
3030 /* Initiate the TX/RX key */
3031 rc = tipc_crypto_key_init(c, ukey, mode, master_key);
3032 if (n)
3033 tipc_node_put(n);
3034
3035 if (unlikely(rc < 0)) {
3036 GENL_SET_ERR_MSG(info, "unable to initiate or attach new key");
3037 return rc;
3038 } else if (c == tx) {
3039 /* Distribute TX key but not master one */
3040 if (!master_key && tipc_crypto_key_distr(tx, rc, NULL))
3041 GENL_SET_ERR_MSG(info, "failed to replicate new key");
3042 rekeying:
3043 /* Schedule TX rekeying if needed */
3044 tipc_crypto_rekeying_sched(tx, rekeying, intv);
3045 }
3046
3047 return 0;
3048 }
3049
tipc_nl_node_set_key(struct sk_buff * skb,struct genl_info * info)3050 int tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
3051 {
3052 int err;
3053
3054 rtnl_lock();
3055 err = __tipc_nl_node_set_key(skb, info);
3056 rtnl_unlock();
3057
3058 return err;
3059 }
3060
__tipc_nl_node_flush_key(struct sk_buff * skb,struct genl_info * info)3061 static int __tipc_nl_node_flush_key(struct sk_buff *skb,
3062 struct genl_info *info)
3063 {
3064 struct net *net = sock_net(skb->sk);
3065 struct tipc_net *tn = tipc_net(net);
3066 struct tipc_node *n;
3067
3068 tipc_crypto_key_flush(tn->crypto_tx);
3069 rcu_read_lock();
3070 list_for_each_entry_rcu(n, &tn->node_list, list)
3071 tipc_crypto_key_flush(n->crypto_rx);
3072 rcu_read_unlock();
3073
3074 return 0;
3075 }
3076
tipc_nl_node_flush_key(struct sk_buff * skb,struct genl_info * info)3077 int tipc_nl_node_flush_key(struct sk_buff *skb, struct genl_info *info)
3078 {
3079 int err;
3080
3081 rtnl_lock();
3082 err = __tipc_nl_node_flush_key(skb, info);
3083 rtnl_unlock();
3084
3085 return err;
3086 }
3087 #endif
3088
3089 /**
3090 * tipc_node_dump - dump TIPC node data
3091 * @n: tipc node to be dumped
3092 * @more: dump more?
3093 * - false: dump only tipc node data
3094 * - true: dump node link data as well
3095 * @buf: returned buffer of dump data in format
3096 */
tipc_node_dump(struct tipc_node * n,bool more,char * buf)3097 int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
3098 {
3099 int i = 0;
3100 size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
3101
3102 if (!n) {
3103 i += scnprintf(buf, sz, "node data: (null)\n");
3104 return i;
3105 }
3106
3107 i += scnprintf(buf, sz, "node data: %x", n->addr);
3108 i += scnprintf(buf + i, sz - i, " %x", n->state);
3109 i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
3110 i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
3111 i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
3112 i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
3113 i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
3114 i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
3115 i += scnprintf(buf + i, sz - i, " %u", n->working_links);
3116 i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
3117 i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
3118
3119 if (!more)
3120 return i;
3121
3122 i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
3123 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
3124 i += scnprintf(buf + i, sz - i, " media: ");
3125 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
3126 i += scnprintf(buf + i, sz - i, "\n");
3127 i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
3128 i += scnprintf(buf + i, sz - i, " inputq: ");
3129 i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
3130
3131 i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
3132 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
3133 i += scnprintf(buf + i, sz - i, " media: ");
3134 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
3135 i += scnprintf(buf + i, sz - i, "\n");
3136 i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
3137 i += scnprintf(buf + i, sz - i, " inputq: ");
3138 i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
3139
3140 i += scnprintf(buf + i, sz - i, "bclink:\n ");
3141 i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
3142
3143 return i;
3144 }
3145
tipc_node_pre_cleanup_net(struct net * exit_net)3146 void tipc_node_pre_cleanup_net(struct net *exit_net)
3147 {
3148 struct tipc_node *n;
3149 struct tipc_net *tn;
3150 struct net *tmp;
3151
3152 rcu_read_lock();
3153 for_each_net_rcu(tmp) {
3154 if (tmp == exit_net)
3155 continue;
3156 tn = tipc_net(tmp);
3157 if (!tn)
3158 continue;
3159 spin_lock_bh(&tn->node_list_lock);
3160 list_for_each_entry_rcu(n, &tn->node_list, list) {
3161 if (!n->peer_net)
3162 continue;
3163 if (n->peer_net != exit_net)
3164 continue;
3165 tipc_node_write_lock(n);
3166 n->peer_net = NULL;
3167 n->peer_hash_mix = 0;
3168 tipc_node_write_unlock_fast(n);
3169 break;
3170 }
3171 spin_unlock_bh(&tn->node_list_lock);
3172 }
3173 rcu_read_unlock();
3174 }
3175