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 * @inputq: pointer to input queue containing messages for msg event
90 * @namedq: pointer to name table input queue with name table messages
91 * @active_links: bearer ids of active links, used as index into links[] array
92 * @links: array containing references to all links to node
93 * @bc_entry: broadcast link entry
94 * @action_flags: bit mask of different types of node actions
95 * @state: connectivity state vs peer node
96 * @preliminary: a preliminary node or not
97 * @failover_sent: failover sent or not
98 * @sync_point: sequence number where synch/failover is finished
99 * @list: links to adjacent nodes in sorted list of cluster's nodes
100 * @working_links: number of working links to node (both active and standby)
101 * @link_cnt: number of links to node
102 * @capabilities: bitmap, indicating peer node's functional capabilities
103 * @signature: node instance identifier
104 * @link_id: local and remote bearer ids of changing link, if any
105 * @peer_id: 128-bit ID of peer
106 * @peer_id_string: ID string of peer
107 * @publ_list: list of publications
108 * @conn_sks: list of connections (FIXME)
109 * @timer: node's keepalive timer
110 * @keepalive_intv: keepalive interval in milliseconds
111 * @rcu: rcu struct for tipc_node
112 * @delete_at: indicates the time for deleting a down node
113 * @peer_net: peer's net namespace
114 * @peer_hash_mix: hash for this peer (FIXME)
115 * @crypto_rx: RX crypto handler
116 */
117 struct tipc_node {
118 u32 addr;
119 struct kref kref;
120 rwlock_t lock;
121 struct net *net;
122 struct hlist_node hash;
123 int active_links[2];
124 struct tipc_link_entry links[MAX_BEARERS];
125 struct tipc_bclink_entry bc_entry;
126 int action_flags;
127 struct list_head list;
128 int state;
129 bool preliminary;
130 bool failover_sent;
131 u16 sync_point;
132 int link_cnt;
133 u16 working_links;
134 u16 capabilities;
135 u32 signature;
136 u32 link_id;
137 u8 peer_id[16];
138 char peer_id_string[NODE_ID_STR_LEN];
139 struct list_head publ_list;
140 struct list_head conn_sks;
141 unsigned long keepalive_intv;
142 struct timer_list timer;
143 struct rcu_head rcu;
144 unsigned long delete_at;
145 struct net *peer_net;
146 u32 peer_hash_mix;
147 #ifdef CONFIG_TIPC_CRYPTO
148 struct tipc_crypto *crypto_rx;
149 #endif
150 };
151
152 /* Node FSM states and events:
153 */
154 enum {
155 SELF_DOWN_PEER_DOWN = 0xdd,
156 SELF_UP_PEER_UP = 0xaa,
157 SELF_DOWN_PEER_LEAVING = 0xd1,
158 SELF_UP_PEER_COMING = 0xac,
159 SELF_COMING_PEER_UP = 0xca,
160 SELF_LEAVING_PEER_DOWN = 0x1d,
161 NODE_FAILINGOVER = 0xf0,
162 NODE_SYNCHING = 0xcc
163 };
164
165 enum {
166 SELF_ESTABL_CONTACT_EVT = 0xece,
167 SELF_LOST_CONTACT_EVT = 0x1ce,
168 PEER_ESTABL_CONTACT_EVT = 0x9ece,
169 PEER_LOST_CONTACT_EVT = 0x91ce,
170 NODE_FAILOVER_BEGIN_EVT = 0xfbe,
171 NODE_FAILOVER_END_EVT = 0xfee,
172 NODE_SYNCH_BEGIN_EVT = 0xcbe,
173 NODE_SYNCH_END_EVT = 0xcee
174 };
175
176 static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
177 struct sk_buff_head *xmitq,
178 struct tipc_media_addr **maddr);
179 static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
180 bool delete);
181 static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
182 static void tipc_node_delete(struct tipc_node *node);
183 static void tipc_node_timeout(struct timer_list *t);
184 static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
185 static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
186 static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
187 static bool node_is_up(struct tipc_node *n);
188 static void tipc_node_delete_from_list(struct tipc_node *node);
189
190 struct tipc_sock_conn {
191 u32 port;
192 u32 peer_port;
193 u32 peer_node;
194 struct list_head list;
195 };
196
node_active_link(struct tipc_node * n,int sel)197 static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
198 {
199 int bearer_id = n->active_links[sel & 1];
200
201 if (unlikely(bearer_id == INVALID_BEARER_ID))
202 return NULL;
203
204 return n->links[bearer_id].link;
205 }
206
tipc_node_get_mtu(struct net * net,u32 addr,u32 sel,bool connected)207 int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel, bool connected)
208 {
209 struct tipc_node *n;
210 int bearer_id;
211 unsigned int mtu = MAX_MSG_SIZE;
212
213 n = tipc_node_find(net, addr);
214 if (unlikely(!n))
215 return mtu;
216
217 /* Allow MAX_MSG_SIZE when building connection oriented message
218 * if they are in the same core network
219 */
220 if (n->peer_net && connected) {
221 tipc_node_put(n);
222 return mtu;
223 }
224
225 bearer_id = n->active_links[sel & 1];
226 if (likely(bearer_id != INVALID_BEARER_ID))
227 mtu = n->links[bearer_id].mtu;
228 tipc_node_put(n);
229 return mtu;
230 }
231
tipc_node_get_id(struct net * net,u32 addr,u8 * id)232 bool tipc_node_get_id(struct net *net, u32 addr, u8 *id)
233 {
234 u8 *own_id = tipc_own_id(net);
235 struct tipc_node *n;
236
237 if (!own_id)
238 return true;
239
240 if (addr == tipc_own_addr(net)) {
241 memcpy(id, own_id, TIPC_NODEID_LEN);
242 return true;
243 }
244 n = tipc_node_find(net, addr);
245 if (!n)
246 return false;
247
248 memcpy(id, &n->peer_id, TIPC_NODEID_LEN);
249 tipc_node_put(n);
250 return true;
251 }
252
tipc_node_get_capabilities(struct net * net,u32 addr)253 u16 tipc_node_get_capabilities(struct net *net, u32 addr)
254 {
255 struct tipc_node *n;
256 u16 caps;
257
258 n = tipc_node_find(net, addr);
259 if (unlikely(!n))
260 return TIPC_NODE_CAPABILITIES;
261 caps = n->capabilities;
262 tipc_node_put(n);
263 return caps;
264 }
265
tipc_node_get_addr(struct tipc_node * node)266 u32 tipc_node_get_addr(struct tipc_node *node)
267 {
268 return (node) ? node->addr : 0;
269 }
270
tipc_node_get_id_str(struct tipc_node * node)271 char *tipc_node_get_id_str(struct tipc_node *node)
272 {
273 return node->peer_id_string;
274 }
275
276 #ifdef CONFIG_TIPC_CRYPTO
277 /**
278 * tipc_node_crypto_rx - Retrieve crypto RX handle from node
279 * @__n: target tipc_node
280 * Note: node ref counter must be held first!
281 */
tipc_node_crypto_rx(struct tipc_node * __n)282 struct tipc_crypto *tipc_node_crypto_rx(struct tipc_node *__n)
283 {
284 return (__n) ? __n->crypto_rx : NULL;
285 }
286
tipc_node_crypto_rx_by_list(struct list_head * pos)287 struct tipc_crypto *tipc_node_crypto_rx_by_list(struct list_head *pos)
288 {
289 return container_of(pos, struct tipc_node, list)->crypto_rx;
290 }
291
tipc_node_crypto_rx_by_addr(struct net * net,u32 addr)292 struct tipc_crypto *tipc_node_crypto_rx_by_addr(struct net *net, u32 addr)
293 {
294 struct tipc_node *n;
295
296 n = tipc_node_find(net, addr);
297 return (n) ? n->crypto_rx : NULL;
298 }
299 #endif
300
tipc_node_free(struct rcu_head * rp)301 static void tipc_node_free(struct rcu_head *rp)
302 {
303 struct tipc_node *n = container_of(rp, struct tipc_node, rcu);
304
305 #ifdef CONFIG_TIPC_CRYPTO
306 tipc_crypto_stop(&n->crypto_rx);
307 #endif
308 kfree(n);
309 }
310
tipc_node_kref_release(struct kref * kref)311 static void tipc_node_kref_release(struct kref *kref)
312 {
313 struct tipc_node *n = container_of(kref, struct tipc_node, kref);
314
315 kfree(n->bc_entry.link);
316 call_rcu(&n->rcu, tipc_node_free);
317 }
318
tipc_node_put(struct tipc_node * node)319 void tipc_node_put(struct tipc_node *node)
320 {
321 kref_put(&node->kref, tipc_node_kref_release);
322 }
323
tipc_node_get(struct tipc_node * node)324 void tipc_node_get(struct tipc_node *node)
325 {
326 kref_get(&node->kref);
327 }
328
329 /*
330 * tipc_node_find - locate specified node object, if it exists
331 */
tipc_node_find(struct net * net,u32 addr)332 static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
333 {
334 struct tipc_net *tn = tipc_net(net);
335 struct tipc_node *node;
336 unsigned int thash = tipc_hashfn(addr);
337
338 rcu_read_lock();
339 hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
340 if (node->addr != addr || node->preliminary)
341 continue;
342 if (!kref_get_unless_zero(&node->kref))
343 node = NULL;
344 break;
345 }
346 rcu_read_unlock();
347 return node;
348 }
349
350 /* tipc_node_find_by_id - locate specified node object by its 128-bit id
351 * Note: this function is called only when a discovery request failed
352 * to find the node by its 32-bit id, and is not time critical
353 */
tipc_node_find_by_id(struct net * net,u8 * id)354 static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id)
355 {
356 struct tipc_net *tn = tipc_net(net);
357 struct tipc_node *n;
358 bool found = false;
359
360 rcu_read_lock();
361 list_for_each_entry_rcu(n, &tn->node_list, list) {
362 read_lock_bh(&n->lock);
363 if (!memcmp(id, n->peer_id, 16) &&
364 kref_get_unless_zero(&n->kref))
365 found = true;
366 read_unlock_bh(&n->lock);
367 if (found)
368 break;
369 }
370 rcu_read_unlock();
371 return found ? n : NULL;
372 }
373
tipc_node_read_lock(struct tipc_node * n)374 static void tipc_node_read_lock(struct tipc_node *n)
375 __acquires(n->lock)
376 {
377 read_lock_bh(&n->lock);
378 }
379
tipc_node_read_unlock(struct tipc_node * n)380 static void tipc_node_read_unlock(struct tipc_node *n)
381 __releases(n->lock)
382 {
383 read_unlock_bh(&n->lock);
384 }
385
tipc_node_write_lock(struct tipc_node * n)386 static void tipc_node_write_lock(struct tipc_node *n)
387 __acquires(n->lock)
388 {
389 write_lock_bh(&n->lock);
390 }
391
tipc_node_write_unlock_fast(struct tipc_node * n)392 static void tipc_node_write_unlock_fast(struct tipc_node *n)
393 __releases(n->lock)
394 {
395 write_unlock_bh(&n->lock);
396 }
397
tipc_node_write_unlock(struct tipc_node * n)398 static void tipc_node_write_unlock(struct tipc_node *n)
399 __releases(n->lock)
400 {
401 struct tipc_socket_addr sk;
402 struct net *net = n->net;
403 u32 flags = n->action_flags;
404 struct list_head *publ_list;
405 struct tipc_uaddr ua;
406 u32 bearer_id, node;
407
408 if (likely(!flags)) {
409 write_unlock_bh(&n->lock);
410 return;
411 }
412
413 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_NODE_SCOPE,
414 TIPC_LINK_STATE, n->addr, n->addr);
415 sk.ref = n->link_id;
416 sk.node = tipc_own_addr(net);
417 node = n->addr;
418 bearer_id = n->link_id & 0xffff;
419 publ_list = &n->publ_list;
420
421 n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
422 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
423
424 write_unlock_bh(&n->lock);
425
426 if (flags & TIPC_NOTIFY_NODE_DOWN)
427 tipc_publ_notify(net, publ_list, node, n->capabilities);
428
429 if (flags & TIPC_NOTIFY_NODE_UP)
430 tipc_named_node_up(net, node, n->capabilities);
431
432 if (flags & TIPC_NOTIFY_LINK_UP) {
433 tipc_mon_peer_up(net, node, bearer_id);
434 tipc_nametbl_publish(net, &ua, &sk, sk.ref);
435 }
436 if (flags & TIPC_NOTIFY_LINK_DOWN) {
437 tipc_mon_peer_down(net, node, bearer_id);
438 tipc_nametbl_withdraw(net, &ua, &sk, sk.ref);
439 }
440 }
441
tipc_node_assign_peer_net(struct tipc_node * n,u32 hash_mixes)442 static void tipc_node_assign_peer_net(struct tipc_node *n, u32 hash_mixes)
443 {
444 int net_id = tipc_netid(n->net);
445 struct tipc_net *tn_peer;
446 struct net *tmp;
447 u32 hash_chk;
448
449 if (n->peer_net)
450 return;
451
452 for_each_net_rcu(tmp) {
453 tn_peer = tipc_net(tmp);
454 if (!tn_peer)
455 continue;
456 /* Integrity checking whether node exists in namespace or not */
457 if (tn_peer->net_id != net_id)
458 continue;
459 if (memcmp(n->peer_id, tn_peer->node_id, NODE_ID_LEN))
460 continue;
461 hash_chk = tipc_net_hash_mixes(tmp, tn_peer->random);
462 if (hash_mixes ^ hash_chk)
463 continue;
464 n->peer_net = tmp;
465 n->peer_hash_mix = hash_mixes;
466 break;
467 }
468 }
469
tipc_node_create(struct net * net,u32 addr,u8 * peer_id,u16 capabilities,u32 hash_mixes,bool preliminary)470 struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
471 u16 capabilities, u32 hash_mixes,
472 bool preliminary)
473 {
474 struct tipc_net *tn = net_generic(net, tipc_net_id);
475 struct tipc_link *l, *snd_l = tipc_bc_sndlink(net);
476 struct tipc_node *n, *temp_node;
477 unsigned long intv;
478 int bearer_id;
479 int i;
480
481 spin_lock_bh(&tn->node_list_lock);
482 n = tipc_node_find(net, addr) ?:
483 tipc_node_find_by_id(net, peer_id);
484 if (n) {
485 if (!n->preliminary)
486 goto update;
487 if (preliminary)
488 goto exit;
489 /* A preliminary node becomes "real" now, refresh its data */
490 tipc_node_write_lock(n);
491 if (!tipc_link_bc_create(net, tipc_own_addr(net), addr, peer_id, U16_MAX,
492 tipc_link_min_win(snd_l), tipc_link_max_win(snd_l),
493 n->capabilities, &n->bc_entry.inputq1,
494 &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) {
495 pr_warn("Broadcast rcv link refresh failed, no memory\n");
496 tipc_node_write_unlock_fast(n);
497 tipc_node_put(n);
498 n = NULL;
499 goto exit;
500 }
501 n->preliminary = false;
502 n->addr = addr;
503 hlist_del_rcu(&n->hash);
504 hlist_add_head_rcu(&n->hash,
505 &tn->node_htable[tipc_hashfn(addr)]);
506 list_del_rcu(&n->list);
507 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
508 if (n->addr < temp_node->addr)
509 break;
510 }
511 list_add_tail_rcu(&n->list, &temp_node->list);
512 tipc_node_write_unlock_fast(n);
513
514 update:
515 if (n->peer_hash_mix ^ hash_mixes)
516 tipc_node_assign_peer_net(n, hash_mixes);
517 if (n->capabilities == capabilities)
518 goto exit;
519 /* Same node may come back with new capabilities */
520 tipc_node_write_lock(n);
521 n->capabilities = capabilities;
522 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
523 l = n->links[bearer_id].link;
524 if (l)
525 tipc_link_update_caps(l, capabilities);
526 }
527 tipc_node_write_unlock_fast(n);
528
529 /* Calculate cluster capabilities */
530 tn->capabilities = TIPC_NODE_CAPABILITIES;
531 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
532 tn->capabilities &= temp_node->capabilities;
533 }
534
535 tipc_bcast_toggle_rcast(net,
536 (tn->capabilities & TIPC_BCAST_RCAST));
537
538 goto exit;
539 }
540 n = kzalloc(sizeof(*n), GFP_ATOMIC);
541 if (!n) {
542 pr_warn("Node creation failed, no memory\n");
543 goto exit;
544 }
545 tipc_nodeid2string(n->peer_id_string, peer_id);
546 #ifdef CONFIG_TIPC_CRYPTO
547 if (unlikely(tipc_crypto_start(&n->crypto_rx, net, n))) {
548 pr_warn("Failed to start crypto RX(%s)!\n", n->peer_id_string);
549 kfree(n);
550 n = NULL;
551 goto exit;
552 }
553 #endif
554 n->addr = addr;
555 n->preliminary = preliminary;
556 memcpy(&n->peer_id, peer_id, 16);
557 n->net = net;
558 n->peer_net = NULL;
559 n->peer_hash_mix = 0;
560 /* Assign kernel local namespace if exists */
561 tipc_node_assign_peer_net(n, hash_mixes);
562 n->capabilities = capabilities;
563 kref_init(&n->kref);
564 rwlock_init(&n->lock);
565 INIT_HLIST_NODE(&n->hash);
566 INIT_LIST_HEAD(&n->list);
567 INIT_LIST_HEAD(&n->publ_list);
568 INIT_LIST_HEAD(&n->conn_sks);
569 skb_queue_head_init(&n->bc_entry.namedq);
570 skb_queue_head_init(&n->bc_entry.inputq1);
571 __skb_queue_head_init(&n->bc_entry.arrvq);
572 skb_queue_head_init(&n->bc_entry.inputq2);
573 for (i = 0; i < MAX_BEARERS; i++)
574 spin_lock_init(&n->links[i].lock);
575 n->state = SELF_DOWN_PEER_LEAVING;
576 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
577 n->signature = INVALID_NODE_SIG;
578 n->active_links[0] = INVALID_BEARER_ID;
579 n->active_links[1] = INVALID_BEARER_ID;
580 if (!preliminary &&
581 !tipc_link_bc_create(net, tipc_own_addr(net), addr, peer_id, U16_MAX,
582 tipc_link_min_win(snd_l), tipc_link_max_win(snd_l),
583 n->capabilities, &n->bc_entry.inputq1,
584 &n->bc_entry.namedq, snd_l, &n->bc_entry.link)) {
585 pr_warn("Broadcast rcv link creation failed, no memory\n");
586 tipc_node_put(n);
587 n = NULL;
588 goto exit;
589 }
590 tipc_node_get(n);
591 timer_setup(&n->timer, tipc_node_timeout, 0);
592 /* Start a slow timer anyway, crypto needs it */
593 n->keepalive_intv = 10000;
594 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
595 if (!mod_timer(&n->timer, intv))
596 tipc_node_get(n);
597 hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
598 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
599 if (n->addr < temp_node->addr)
600 break;
601 }
602 list_add_tail_rcu(&n->list, &temp_node->list);
603 /* Calculate cluster capabilities */
604 tn->capabilities = TIPC_NODE_CAPABILITIES;
605 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
606 tn->capabilities &= temp_node->capabilities;
607 }
608 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
609 trace_tipc_node_create(n, true, " ");
610 exit:
611 spin_unlock_bh(&tn->node_list_lock);
612 return n;
613 }
614
tipc_node_calculate_timer(struct tipc_node * n,struct tipc_link * l)615 static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
616 {
617 unsigned long tol = tipc_link_tolerance(l);
618 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
619
620 /* Link with lowest tolerance determines timer interval */
621 if (intv < n->keepalive_intv)
622 n->keepalive_intv = intv;
623
624 /* Ensure link's abort limit corresponds to current tolerance */
625 tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
626 }
627
tipc_node_delete_from_list(struct tipc_node * node)628 static void tipc_node_delete_from_list(struct tipc_node *node)
629 {
630 #ifdef CONFIG_TIPC_CRYPTO
631 tipc_crypto_key_flush(node->crypto_rx);
632 #endif
633 list_del_rcu(&node->list);
634 hlist_del_rcu(&node->hash);
635 tipc_node_put(node);
636 }
637
tipc_node_delete(struct tipc_node * node)638 static void tipc_node_delete(struct tipc_node *node)
639 {
640 trace_tipc_node_delete(node, true, " ");
641 tipc_node_delete_from_list(node);
642
643 del_timer_sync(&node->timer);
644 tipc_node_put(node);
645 }
646
tipc_node_stop(struct net * net)647 void tipc_node_stop(struct net *net)
648 {
649 struct tipc_net *tn = tipc_net(net);
650 struct tipc_node *node, *t_node;
651
652 spin_lock_bh(&tn->node_list_lock);
653 list_for_each_entry_safe(node, t_node, &tn->node_list, list)
654 tipc_node_delete(node);
655 spin_unlock_bh(&tn->node_list_lock);
656 }
657
tipc_node_subscribe(struct net * net,struct list_head * subscr,u32 addr)658 void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
659 {
660 struct tipc_node *n;
661
662 if (in_own_node(net, addr))
663 return;
664
665 n = tipc_node_find(net, addr);
666 if (!n) {
667 pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
668 return;
669 }
670 tipc_node_write_lock(n);
671 list_add_tail(subscr, &n->publ_list);
672 tipc_node_write_unlock_fast(n);
673 tipc_node_put(n);
674 }
675
tipc_node_unsubscribe(struct net * net,struct list_head * subscr,u32 addr)676 void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
677 {
678 struct tipc_node *n;
679
680 if (in_own_node(net, addr))
681 return;
682
683 n = tipc_node_find(net, addr);
684 if (!n) {
685 pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
686 return;
687 }
688 tipc_node_write_lock(n);
689 list_del_init(subscr);
690 tipc_node_write_unlock_fast(n);
691 tipc_node_put(n);
692 }
693
tipc_node_add_conn(struct net * net,u32 dnode,u32 port,u32 peer_port)694 int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
695 {
696 struct tipc_node *node;
697 struct tipc_sock_conn *conn;
698 int err = 0;
699
700 if (in_own_node(net, dnode))
701 return 0;
702
703 node = tipc_node_find(net, dnode);
704 if (!node) {
705 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
706 return -EHOSTUNREACH;
707 }
708 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
709 if (!conn) {
710 err = -EHOSTUNREACH;
711 goto exit;
712 }
713 conn->peer_node = dnode;
714 conn->port = port;
715 conn->peer_port = peer_port;
716
717 tipc_node_write_lock(node);
718 list_add_tail(&conn->list, &node->conn_sks);
719 tipc_node_write_unlock(node);
720 exit:
721 tipc_node_put(node);
722 return err;
723 }
724
tipc_node_remove_conn(struct net * net,u32 dnode,u32 port)725 void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
726 {
727 struct tipc_node *node;
728 struct tipc_sock_conn *conn, *safe;
729
730 if (in_own_node(net, dnode))
731 return;
732
733 node = tipc_node_find(net, dnode);
734 if (!node)
735 return;
736
737 tipc_node_write_lock(node);
738 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
739 if (port != conn->port)
740 continue;
741 list_del(&conn->list);
742 kfree(conn);
743 }
744 tipc_node_write_unlock(node);
745 tipc_node_put(node);
746 }
747
tipc_node_clear_links(struct tipc_node * node)748 static void tipc_node_clear_links(struct tipc_node *node)
749 {
750 int i;
751
752 for (i = 0; i < MAX_BEARERS; i++) {
753 struct tipc_link_entry *le = &node->links[i];
754
755 if (le->link) {
756 kfree(le->link);
757 le->link = NULL;
758 node->link_cnt--;
759 }
760 }
761 }
762
763 /* tipc_node_cleanup - delete nodes that does not
764 * have active links for NODE_CLEANUP_AFTER time
765 */
tipc_node_cleanup(struct tipc_node * peer)766 static bool tipc_node_cleanup(struct tipc_node *peer)
767 {
768 struct tipc_node *temp_node;
769 struct tipc_net *tn = tipc_net(peer->net);
770 bool deleted = false;
771
772 /* If lock held by tipc_node_stop() the node will be deleted anyway */
773 if (!spin_trylock_bh(&tn->node_list_lock))
774 return false;
775
776 tipc_node_write_lock(peer);
777
778 if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) {
779 tipc_node_clear_links(peer);
780 tipc_node_delete_from_list(peer);
781 deleted = true;
782 }
783 tipc_node_write_unlock(peer);
784
785 if (!deleted) {
786 spin_unlock_bh(&tn->node_list_lock);
787 return deleted;
788 }
789
790 /* Calculate cluster capabilities */
791 tn->capabilities = TIPC_NODE_CAPABILITIES;
792 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
793 tn->capabilities &= temp_node->capabilities;
794 }
795 tipc_bcast_toggle_rcast(peer->net,
796 (tn->capabilities & TIPC_BCAST_RCAST));
797 spin_unlock_bh(&tn->node_list_lock);
798 return deleted;
799 }
800
801 /* tipc_node_timeout - handle expiration of node timer
802 */
tipc_node_timeout(struct timer_list * t)803 static void tipc_node_timeout(struct timer_list *t)
804 {
805 struct tipc_node *n = from_timer(n, t, timer);
806 struct tipc_link_entry *le;
807 struct sk_buff_head xmitq;
808 int remains = n->link_cnt;
809 int bearer_id;
810 int rc = 0;
811
812 trace_tipc_node_timeout(n, false, " ");
813 if (!node_is_up(n) && tipc_node_cleanup(n)) {
814 /*Removing the reference of Timer*/
815 tipc_node_put(n);
816 return;
817 }
818
819 #ifdef CONFIG_TIPC_CRYPTO
820 /* Take any crypto key related actions first */
821 tipc_crypto_timeout(n->crypto_rx);
822 #endif
823 __skb_queue_head_init(&xmitq);
824
825 /* Initial node interval to value larger (10 seconds), then it will be
826 * recalculated with link lowest tolerance
827 */
828 tipc_node_read_lock(n);
829 n->keepalive_intv = 10000;
830 tipc_node_read_unlock(n);
831 for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) {
832 tipc_node_read_lock(n);
833 le = &n->links[bearer_id];
834 if (le->link) {
835 spin_lock_bh(&le->lock);
836 /* Link tolerance may change asynchronously: */
837 tipc_node_calculate_timer(n, le->link);
838 rc = tipc_link_timeout(le->link, &xmitq);
839 spin_unlock_bh(&le->lock);
840 remains--;
841 }
842 tipc_node_read_unlock(n);
843 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr, n);
844 if (rc & TIPC_LINK_DOWN_EVT)
845 tipc_node_link_down(n, bearer_id, false);
846 }
847 mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
848 }
849
850 /**
851 * __tipc_node_link_up - handle addition of link
852 * @n: target tipc_node
853 * @bearer_id: id of the bearer
854 * @xmitq: queue for messages to be xmited on
855 * Node lock must be held by caller
856 * Link becomes active (alone or shared) or standby, depending on its priority.
857 */
__tipc_node_link_up(struct tipc_node * n,int bearer_id,struct sk_buff_head * xmitq)858 static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
859 struct sk_buff_head *xmitq)
860 {
861 int *slot0 = &n->active_links[0];
862 int *slot1 = &n->active_links[1];
863 struct tipc_link *ol = node_active_link(n, 0);
864 struct tipc_link *nl = n->links[bearer_id].link;
865
866 if (!nl || tipc_link_is_up(nl))
867 return;
868
869 tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
870 if (!tipc_link_is_up(nl))
871 return;
872
873 n->working_links++;
874 n->action_flags |= TIPC_NOTIFY_LINK_UP;
875 n->link_id = tipc_link_id(nl);
876
877 /* Leave room for tunnel header when returning 'mtu' to users: */
878 n->links[bearer_id].mtu = tipc_link_mss(nl);
879
880 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
881 tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
882
883 pr_debug("Established link <%s> on network plane %c\n",
884 tipc_link_name(nl), tipc_link_plane(nl));
885 trace_tipc_node_link_up(n, true, " ");
886
887 /* Ensure that a STATE message goes first */
888 tipc_link_build_state_msg(nl, xmitq);
889
890 /* First link? => give it both slots */
891 if (!ol) {
892 *slot0 = bearer_id;
893 *slot1 = bearer_id;
894 tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
895 n->action_flags |= TIPC_NOTIFY_NODE_UP;
896 tipc_link_set_active(nl, true);
897 tipc_bcast_add_peer(n->net, nl, xmitq);
898 return;
899 }
900
901 /* Second link => redistribute slots */
902 if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
903 pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
904 *slot0 = bearer_id;
905 *slot1 = bearer_id;
906 tipc_link_set_active(nl, true);
907 tipc_link_set_active(ol, false);
908 } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
909 tipc_link_set_active(nl, true);
910 *slot1 = bearer_id;
911 } else {
912 pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
913 }
914
915 /* Prepare synchronization with first link */
916 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
917 }
918
919 /**
920 * tipc_node_link_up - handle addition of link
921 * @n: target tipc_node
922 * @bearer_id: id of the bearer
923 * @xmitq: queue for messages to be xmited on
924 *
925 * Link becomes active (alone or shared) or standby, depending on its priority.
926 */
tipc_node_link_up(struct tipc_node * n,int bearer_id,struct sk_buff_head * xmitq)927 static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
928 struct sk_buff_head *xmitq)
929 {
930 struct tipc_media_addr *maddr;
931
932 tipc_node_write_lock(n);
933 __tipc_node_link_up(n, bearer_id, xmitq);
934 maddr = &n->links[bearer_id].maddr;
935 tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr, n);
936 tipc_node_write_unlock(n);
937 }
938
939 /**
940 * tipc_node_link_failover() - start failover in case "half-failover"
941 *
942 * This function is only called in a very special situation where link
943 * failover can be already started on peer node but not on this node.
944 * This can happen when e.g.::
945 *
946 * 1. Both links <1A-2A>, <1B-2B> down
947 * 2. Link endpoint 2A up, but 1A still down (e.g. due to network
948 * disturbance, wrong session, etc.)
949 * 3. Link <1B-2B> up
950 * 4. Link endpoint 2A down (e.g. due to link tolerance timeout)
951 * 5. Node 2 starts failover onto link <1B-2B>
952 *
953 * ==> Node 1 does never start link/node failover!
954 *
955 * @n: tipc node structure
956 * @l: link peer endpoint failingover (- can be NULL)
957 * @tnl: tunnel link
958 * @xmitq: queue for messages to be xmited on tnl link later
959 */
tipc_node_link_failover(struct tipc_node * n,struct tipc_link * l,struct tipc_link * tnl,struct sk_buff_head * xmitq)960 static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,
961 struct tipc_link *tnl,
962 struct sk_buff_head *xmitq)
963 {
964 /* Avoid to be "self-failover" that can never end */
965 if (!tipc_link_is_up(tnl))
966 return;
967
968 /* Don't rush, failure link may be in the process of resetting */
969 if (l && !tipc_link_is_reset(l))
970 return;
971
972 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
973 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
974
975 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
976 tipc_link_failover_prepare(l, tnl, xmitq);
977
978 if (l)
979 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
980 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
981 }
982
983 /**
984 * __tipc_node_link_down - handle loss of link
985 * @n: target tipc_node
986 * @bearer_id: id of the bearer
987 * @xmitq: queue for messages to be xmited on
988 * @maddr: output media address of the bearer
989 */
__tipc_node_link_down(struct tipc_node * n,int * bearer_id,struct sk_buff_head * xmitq,struct tipc_media_addr ** maddr)990 static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
991 struct sk_buff_head *xmitq,
992 struct tipc_media_addr **maddr)
993 {
994 struct tipc_link_entry *le = &n->links[*bearer_id];
995 int *slot0 = &n->active_links[0];
996 int *slot1 = &n->active_links[1];
997 int i, highest = 0, prio;
998 struct tipc_link *l, *_l, *tnl;
999
1000 l = n->links[*bearer_id].link;
1001 if (!l || tipc_link_is_reset(l))
1002 return;
1003
1004 n->working_links--;
1005 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
1006 n->link_id = tipc_link_id(l);
1007
1008 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
1009
1010 pr_debug("Lost link <%s> on network plane %c\n",
1011 tipc_link_name(l), tipc_link_plane(l));
1012
1013 /* Select new active link if any available */
1014 *slot0 = INVALID_BEARER_ID;
1015 *slot1 = INVALID_BEARER_ID;
1016 for (i = 0; i < MAX_BEARERS; i++) {
1017 _l = n->links[i].link;
1018 if (!_l || !tipc_link_is_up(_l))
1019 continue;
1020 if (_l == l)
1021 continue;
1022 prio = tipc_link_prio(_l);
1023 if (prio < highest)
1024 continue;
1025 if (prio > highest) {
1026 highest = prio;
1027 *slot0 = i;
1028 *slot1 = i;
1029 continue;
1030 }
1031 *slot1 = i;
1032 }
1033
1034 if (!node_is_up(n)) {
1035 if (tipc_link_peer_is_down(l))
1036 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1037 tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
1038 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!");
1039 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1040 tipc_link_reset(l);
1041 tipc_link_build_reset_msg(l, xmitq);
1042 *maddr = &n->links[*bearer_id].maddr;
1043 node_lost_contact(n, &le->inputq);
1044 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1045 return;
1046 }
1047 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
1048
1049 /* There is still a working link => initiate failover */
1050 *bearer_id = n->active_links[0];
1051 tnl = n->links[*bearer_id].link;
1052 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1053 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1054 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
1055 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
1056 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!");
1057 tipc_link_reset(l);
1058 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1059 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1060 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
1061 *maddr = &n->links[*bearer_id].maddr;
1062 }
1063
tipc_node_link_down(struct tipc_node * n,int bearer_id,bool delete)1064 static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
1065 {
1066 struct tipc_link_entry *le = &n->links[bearer_id];
1067 struct tipc_media_addr *maddr = NULL;
1068 struct tipc_link *l = le->link;
1069 int old_bearer_id = bearer_id;
1070 struct sk_buff_head xmitq;
1071
1072 if (!l)
1073 return;
1074
1075 __skb_queue_head_init(&xmitq);
1076
1077 tipc_node_write_lock(n);
1078 if (!tipc_link_is_establishing(l)) {
1079 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
1080 } else {
1081 /* Defuse pending tipc_node_link_up() */
1082 tipc_link_reset(l);
1083 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1084 }
1085 if (delete) {
1086 kfree(l);
1087 le->link = NULL;
1088 n->link_cnt--;
1089 }
1090 trace_tipc_node_link_down(n, true, "node link down or deleted!");
1091 tipc_node_write_unlock(n);
1092 if (delete)
1093 tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
1094 if (!skb_queue_empty(&xmitq))
1095 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr, n);
1096 tipc_sk_rcv(n->net, &le->inputq);
1097 }
1098
node_is_up(struct tipc_node * n)1099 static bool node_is_up(struct tipc_node *n)
1100 {
1101 return n->active_links[0] != INVALID_BEARER_ID;
1102 }
1103
tipc_node_is_up(struct net * net,u32 addr)1104 bool tipc_node_is_up(struct net *net, u32 addr)
1105 {
1106 struct tipc_node *n;
1107 bool retval = false;
1108
1109 if (in_own_node(net, addr))
1110 return true;
1111
1112 n = tipc_node_find(net, addr);
1113 if (!n)
1114 return false;
1115 retval = node_is_up(n);
1116 tipc_node_put(n);
1117 return retval;
1118 }
1119
tipc_node_suggest_addr(struct net * net,u32 addr)1120 static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
1121 {
1122 struct tipc_node *n;
1123
1124 addr ^= tipc_net(net)->random;
1125 while ((n = tipc_node_find(net, addr))) {
1126 tipc_node_put(n);
1127 addr++;
1128 }
1129 return addr;
1130 }
1131
1132 /* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
1133 * Returns suggested address if any, otherwise 0
1134 */
tipc_node_try_addr(struct net * net,u8 * id,u32 addr)1135 u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
1136 {
1137 struct tipc_net *tn = tipc_net(net);
1138 struct tipc_node *n;
1139 bool preliminary;
1140 u32 sugg_addr;
1141
1142 /* Suggest new address if some other peer is using this one */
1143 n = tipc_node_find(net, addr);
1144 if (n) {
1145 if (!memcmp(n->peer_id, id, NODE_ID_LEN))
1146 addr = 0;
1147 tipc_node_put(n);
1148 if (!addr)
1149 return 0;
1150 return tipc_node_suggest_addr(net, addr);
1151 }
1152
1153 /* Suggest previously used address if peer is known */
1154 n = tipc_node_find_by_id(net, id);
1155 if (n) {
1156 sugg_addr = n->addr;
1157 preliminary = n->preliminary;
1158 tipc_node_put(n);
1159 if (!preliminary)
1160 return sugg_addr;
1161 }
1162
1163 /* Even this node may be in conflict */
1164 if (tn->trial_addr == addr)
1165 return tipc_node_suggest_addr(net, addr);
1166
1167 return 0;
1168 }
1169
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)1170 void tipc_node_check_dest(struct net *net, u32 addr,
1171 u8 *peer_id, struct tipc_bearer *b,
1172 u16 capabilities, u32 signature, u32 hash_mixes,
1173 struct tipc_media_addr *maddr,
1174 bool *respond, bool *dupl_addr)
1175 {
1176 struct tipc_node *n;
1177 struct tipc_link *l;
1178 struct tipc_link_entry *le;
1179 bool addr_match = false;
1180 bool sign_match = false;
1181 bool link_up = false;
1182 bool link_is_reset = false;
1183 bool accept_addr = false;
1184 bool reset = false;
1185 char *if_name;
1186 unsigned long intv;
1187 u16 session;
1188
1189 *dupl_addr = false;
1190 *respond = false;
1191
1192 n = tipc_node_create(net, addr, peer_id, capabilities, hash_mixes,
1193 false);
1194 if (!n)
1195 return;
1196
1197 tipc_node_write_lock(n);
1198
1199 le = &n->links[b->identity];
1200
1201 /* Prepare to validate requesting node's signature and media address */
1202 l = le->link;
1203 link_up = l && tipc_link_is_up(l);
1204 link_is_reset = l && tipc_link_is_reset(l);
1205 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
1206 sign_match = (signature == n->signature);
1207
1208 /* These three flags give us eight permutations: */
1209
1210 if (sign_match && addr_match && link_up) {
1211 /* All is fine. Ignore requests. */
1212 /* Peer node is not a container/local namespace */
1213 if (!n->peer_hash_mix)
1214 n->peer_hash_mix = hash_mixes;
1215 } else if (sign_match && addr_match && !link_up) {
1216 /* Respond. The link will come up in due time */
1217 *respond = true;
1218 } else if (sign_match && !addr_match && link_up) {
1219 /* Peer has changed i/f address without rebooting.
1220 * If so, the link will reset soon, and the next
1221 * discovery will be accepted. So we can ignore it.
1222 * It may also be a cloned or malicious peer having
1223 * chosen the same node address and signature as an
1224 * existing one.
1225 * Ignore requests until the link goes down, if ever.
1226 */
1227 *dupl_addr = true;
1228 } else if (sign_match && !addr_match && !link_up) {
1229 /* Peer link has changed i/f address without rebooting.
1230 * It may also be a cloned or malicious peer; we can't
1231 * distinguish between the two.
1232 * The signature is correct, so we must accept.
1233 */
1234 accept_addr = true;
1235 *respond = true;
1236 reset = true;
1237 } else if (!sign_match && addr_match && link_up) {
1238 /* Peer node rebooted. Two possibilities:
1239 * - Delayed re-discovery; this link endpoint has already
1240 * reset and re-established contact with the peer, before
1241 * receiving a discovery message from that node.
1242 * (The peer happened to receive one from this node first).
1243 * - The peer came back so fast that our side has not
1244 * discovered it yet. Probing from this side will soon
1245 * reset the link, since there can be no working link
1246 * endpoint at the peer end, and the link will re-establish.
1247 * Accept the signature, since it comes from a known peer.
1248 */
1249 n->signature = signature;
1250 } else if (!sign_match && addr_match && !link_up) {
1251 /* The peer node has rebooted.
1252 * Accept signature, since it is a known peer.
1253 */
1254 n->signature = signature;
1255 *respond = true;
1256 } else if (!sign_match && !addr_match && link_up) {
1257 /* Peer rebooted with new address, or a new/duplicate peer.
1258 * Ignore until the link goes down, if ever.
1259 */
1260 *dupl_addr = true;
1261 } else if (!sign_match && !addr_match && !link_up) {
1262 /* Peer rebooted with new address, or it is a new peer.
1263 * Accept signature and address.
1264 */
1265 n->signature = signature;
1266 accept_addr = true;
1267 *respond = true;
1268 reset = true;
1269 }
1270
1271 if (!accept_addr)
1272 goto exit;
1273
1274 /* Now create new link if not already existing */
1275 if (!l) {
1276 if (n->link_cnt == 2)
1277 goto exit;
1278
1279 if_name = strchr(b->name, ':') + 1;
1280 get_random_bytes(&session, sizeof(u16));
1281 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
1282 b->net_plane, b->mtu, b->priority,
1283 b->min_win, b->max_win, session,
1284 tipc_own_addr(net), addr, peer_id,
1285 n->capabilities,
1286 tipc_bc_sndlink(n->net), n->bc_entry.link,
1287 &le->inputq,
1288 &n->bc_entry.namedq, &l)) {
1289 *respond = false;
1290 goto exit;
1291 }
1292 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!");
1293 tipc_link_reset(l);
1294 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1295 if (n->state == NODE_FAILINGOVER)
1296 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1297 link_is_reset = tipc_link_is_reset(l);
1298 le->link = l;
1299 n->link_cnt++;
1300 tipc_node_calculate_timer(n, l);
1301 if (n->link_cnt == 1) {
1302 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
1303 if (!mod_timer(&n->timer, intv))
1304 tipc_node_get(n);
1305 }
1306 }
1307 memcpy(&le->maddr, maddr, sizeof(*maddr));
1308 exit:
1309 tipc_node_write_unlock(n);
1310 if (reset && !link_is_reset)
1311 tipc_node_link_down(n, b->identity, false);
1312 tipc_node_put(n);
1313 }
1314
tipc_node_delete_links(struct net * net,int bearer_id)1315 void tipc_node_delete_links(struct net *net, int bearer_id)
1316 {
1317 struct tipc_net *tn = net_generic(net, tipc_net_id);
1318 struct tipc_node *n;
1319
1320 rcu_read_lock();
1321 list_for_each_entry_rcu(n, &tn->node_list, list) {
1322 tipc_node_link_down(n, bearer_id, true);
1323 }
1324 rcu_read_unlock();
1325 }
1326
tipc_node_reset_links(struct tipc_node * n)1327 static void tipc_node_reset_links(struct tipc_node *n)
1328 {
1329 int i;
1330
1331 pr_warn("Resetting all links to %x\n", n->addr);
1332
1333 trace_tipc_node_reset_links(n, true, " ");
1334 for (i = 0; i < MAX_BEARERS; i++) {
1335 tipc_node_link_down(n, i, false);
1336 }
1337 }
1338
1339 /* tipc_node_fsm_evt - node finite state machine
1340 * Determines when contact is allowed with peer node
1341 */
tipc_node_fsm_evt(struct tipc_node * n,int evt)1342 static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
1343 {
1344 int state = n->state;
1345
1346 switch (state) {
1347 case SELF_DOWN_PEER_DOWN:
1348 switch (evt) {
1349 case SELF_ESTABL_CONTACT_EVT:
1350 state = SELF_UP_PEER_COMING;
1351 break;
1352 case PEER_ESTABL_CONTACT_EVT:
1353 state = SELF_COMING_PEER_UP;
1354 break;
1355 case SELF_LOST_CONTACT_EVT:
1356 case PEER_LOST_CONTACT_EVT:
1357 break;
1358 case NODE_SYNCH_END_EVT:
1359 case NODE_SYNCH_BEGIN_EVT:
1360 case NODE_FAILOVER_BEGIN_EVT:
1361 case NODE_FAILOVER_END_EVT:
1362 default:
1363 goto illegal_evt;
1364 }
1365 break;
1366 case SELF_UP_PEER_UP:
1367 switch (evt) {
1368 case SELF_LOST_CONTACT_EVT:
1369 state = SELF_DOWN_PEER_LEAVING;
1370 break;
1371 case PEER_LOST_CONTACT_EVT:
1372 state = SELF_LEAVING_PEER_DOWN;
1373 break;
1374 case NODE_SYNCH_BEGIN_EVT:
1375 state = NODE_SYNCHING;
1376 break;
1377 case NODE_FAILOVER_BEGIN_EVT:
1378 state = NODE_FAILINGOVER;
1379 break;
1380 case SELF_ESTABL_CONTACT_EVT:
1381 case PEER_ESTABL_CONTACT_EVT:
1382 case NODE_SYNCH_END_EVT:
1383 case NODE_FAILOVER_END_EVT:
1384 break;
1385 default:
1386 goto illegal_evt;
1387 }
1388 break;
1389 case SELF_DOWN_PEER_LEAVING:
1390 switch (evt) {
1391 case PEER_LOST_CONTACT_EVT:
1392 state = SELF_DOWN_PEER_DOWN;
1393 break;
1394 case SELF_ESTABL_CONTACT_EVT:
1395 case PEER_ESTABL_CONTACT_EVT:
1396 case SELF_LOST_CONTACT_EVT:
1397 break;
1398 case NODE_SYNCH_END_EVT:
1399 case NODE_SYNCH_BEGIN_EVT:
1400 case NODE_FAILOVER_BEGIN_EVT:
1401 case NODE_FAILOVER_END_EVT:
1402 default:
1403 goto illegal_evt;
1404 }
1405 break;
1406 case SELF_UP_PEER_COMING:
1407 switch (evt) {
1408 case PEER_ESTABL_CONTACT_EVT:
1409 state = SELF_UP_PEER_UP;
1410 break;
1411 case SELF_LOST_CONTACT_EVT:
1412 state = SELF_DOWN_PEER_DOWN;
1413 break;
1414 case SELF_ESTABL_CONTACT_EVT:
1415 case PEER_LOST_CONTACT_EVT:
1416 case NODE_SYNCH_END_EVT:
1417 case NODE_FAILOVER_BEGIN_EVT:
1418 break;
1419 case NODE_SYNCH_BEGIN_EVT:
1420 case NODE_FAILOVER_END_EVT:
1421 default:
1422 goto illegal_evt;
1423 }
1424 break;
1425 case SELF_COMING_PEER_UP:
1426 switch (evt) {
1427 case SELF_ESTABL_CONTACT_EVT:
1428 state = SELF_UP_PEER_UP;
1429 break;
1430 case PEER_LOST_CONTACT_EVT:
1431 state = SELF_DOWN_PEER_DOWN;
1432 break;
1433 case SELF_LOST_CONTACT_EVT:
1434 case PEER_ESTABL_CONTACT_EVT:
1435 break;
1436 case NODE_SYNCH_END_EVT:
1437 case NODE_SYNCH_BEGIN_EVT:
1438 case NODE_FAILOVER_BEGIN_EVT:
1439 case NODE_FAILOVER_END_EVT:
1440 default:
1441 goto illegal_evt;
1442 }
1443 break;
1444 case SELF_LEAVING_PEER_DOWN:
1445 switch (evt) {
1446 case SELF_LOST_CONTACT_EVT:
1447 state = SELF_DOWN_PEER_DOWN;
1448 break;
1449 case SELF_ESTABL_CONTACT_EVT:
1450 case PEER_ESTABL_CONTACT_EVT:
1451 case PEER_LOST_CONTACT_EVT:
1452 break;
1453 case NODE_SYNCH_END_EVT:
1454 case NODE_SYNCH_BEGIN_EVT:
1455 case NODE_FAILOVER_BEGIN_EVT:
1456 case NODE_FAILOVER_END_EVT:
1457 default:
1458 goto illegal_evt;
1459 }
1460 break;
1461 case NODE_FAILINGOVER:
1462 switch (evt) {
1463 case SELF_LOST_CONTACT_EVT:
1464 state = SELF_DOWN_PEER_LEAVING;
1465 break;
1466 case PEER_LOST_CONTACT_EVT:
1467 state = SELF_LEAVING_PEER_DOWN;
1468 break;
1469 case NODE_FAILOVER_END_EVT:
1470 state = SELF_UP_PEER_UP;
1471 break;
1472 case NODE_FAILOVER_BEGIN_EVT:
1473 case SELF_ESTABL_CONTACT_EVT:
1474 case PEER_ESTABL_CONTACT_EVT:
1475 break;
1476 case NODE_SYNCH_BEGIN_EVT:
1477 case NODE_SYNCH_END_EVT:
1478 default:
1479 goto illegal_evt;
1480 }
1481 break;
1482 case NODE_SYNCHING:
1483 switch (evt) {
1484 case SELF_LOST_CONTACT_EVT:
1485 state = SELF_DOWN_PEER_LEAVING;
1486 break;
1487 case PEER_LOST_CONTACT_EVT:
1488 state = SELF_LEAVING_PEER_DOWN;
1489 break;
1490 case NODE_SYNCH_END_EVT:
1491 state = SELF_UP_PEER_UP;
1492 break;
1493 case NODE_FAILOVER_BEGIN_EVT:
1494 state = NODE_FAILINGOVER;
1495 break;
1496 case NODE_SYNCH_BEGIN_EVT:
1497 case SELF_ESTABL_CONTACT_EVT:
1498 case PEER_ESTABL_CONTACT_EVT:
1499 break;
1500 case NODE_FAILOVER_END_EVT:
1501 default:
1502 goto illegal_evt;
1503 }
1504 break;
1505 default:
1506 pr_err("Unknown node fsm state %x\n", state);
1507 break;
1508 }
1509 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1510 n->state = state;
1511 return;
1512
1513 illegal_evt:
1514 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1515 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1516 }
1517
node_lost_contact(struct tipc_node * n,struct sk_buff_head * inputq)1518 static void node_lost_contact(struct tipc_node *n,
1519 struct sk_buff_head *inputq)
1520 {
1521 struct tipc_sock_conn *conn, *safe;
1522 struct tipc_link *l;
1523 struct list_head *conns = &n->conn_sks;
1524 struct sk_buff *skb;
1525 uint i;
1526
1527 pr_debug("Lost contact with %x\n", n->addr);
1528 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
1529 trace_tipc_node_lost_contact(n, true, " ");
1530
1531 /* Clean up broadcast state */
1532 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1533 skb_queue_purge(&n->bc_entry.namedq);
1534
1535 /* Abort any ongoing link failover */
1536 for (i = 0; i < MAX_BEARERS; i++) {
1537 l = n->links[i].link;
1538 if (l)
1539 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1540 }
1541
1542 /* Notify publications from this node */
1543 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1544 n->peer_net = NULL;
1545 n->peer_hash_mix = 0;
1546 /* Notify sockets connected to node */
1547 list_for_each_entry_safe(conn, safe, conns, list) {
1548 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1549 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1550 conn->peer_node, conn->port,
1551 conn->peer_port, TIPC_ERR_NO_NODE);
1552 if (likely(skb))
1553 skb_queue_tail(inputq, skb);
1554 list_del(&conn->list);
1555 kfree(conn);
1556 }
1557 }
1558
1559 /**
1560 * tipc_node_get_linkname - get the name of a link
1561 *
1562 * @net: the applicable net namespace
1563 * @bearer_id: id of the bearer
1564 * @addr: peer node address
1565 * @linkname: link name output buffer
1566 * @len: size of @linkname output buffer
1567 *
1568 * Return: 0 on success
1569 */
tipc_node_get_linkname(struct net * net,u32 bearer_id,u32 addr,char * linkname,size_t len)1570 int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1571 char *linkname, size_t len)
1572 {
1573 struct tipc_link *link;
1574 int err = -EINVAL;
1575 struct tipc_node *node = tipc_node_find(net, addr);
1576
1577 if (!node)
1578 return err;
1579
1580 if (bearer_id >= MAX_BEARERS)
1581 goto exit;
1582
1583 tipc_node_read_lock(node);
1584 link = node->links[bearer_id].link;
1585 if (link) {
1586 strncpy(linkname, tipc_link_name(link), len);
1587 err = 0;
1588 }
1589 tipc_node_read_unlock(node);
1590 exit:
1591 tipc_node_put(node);
1592 return err;
1593 }
1594
1595 /* Caller should hold node lock for the passed node */
__tipc_nl_add_node(struct tipc_nl_msg * msg,struct tipc_node * node)1596 static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1597 {
1598 void *hdr;
1599 struct nlattr *attrs;
1600
1601 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1602 NLM_F_MULTI, TIPC_NL_NODE_GET);
1603 if (!hdr)
1604 return -EMSGSIZE;
1605
1606 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NODE);
1607 if (!attrs)
1608 goto msg_full;
1609
1610 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1611 goto attr_msg_full;
1612 if (node_is_up(node))
1613 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1614 goto attr_msg_full;
1615
1616 nla_nest_end(msg->skb, attrs);
1617 genlmsg_end(msg->skb, hdr);
1618
1619 return 0;
1620
1621 attr_msg_full:
1622 nla_nest_cancel(msg->skb, attrs);
1623 msg_full:
1624 genlmsg_cancel(msg->skb, hdr);
1625
1626 return -EMSGSIZE;
1627 }
1628
tipc_lxc_xmit(struct net * peer_net,struct sk_buff_head * list)1629 static void tipc_lxc_xmit(struct net *peer_net, struct sk_buff_head *list)
1630 {
1631 struct tipc_msg *hdr = buf_msg(skb_peek(list));
1632 struct sk_buff_head inputq;
1633
1634 switch (msg_user(hdr)) {
1635 case TIPC_LOW_IMPORTANCE:
1636 case TIPC_MEDIUM_IMPORTANCE:
1637 case TIPC_HIGH_IMPORTANCE:
1638 case TIPC_CRITICAL_IMPORTANCE:
1639 if (msg_connected(hdr) || msg_named(hdr) ||
1640 msg_direct(hdr)) {
1641 tipc_loopback_trace(peer_net, list);
1642 spin_lock_init(&list->lock);
1643 tipc_sk_rcv(peer_net, list);
1644 return;
1645 }
1646 if (msg_mcast(hdr)) {
1647 tipc_loopback_trace(peer_net, list);
1648 skb_queue_head_init(&inputq);
1649 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1650 __skb_queue_purge(list);
1651 skb_queue_purge(&inputq);
1652 return;
1653 }
1654 return;
1655 case MSG_FRAGMENTER:
1656 if (tipc_msg_assemble(list)) {
1657 tipc_loopback_trace(peer_net, list);
1658 skb_queue_head_init(&inputq);
1659 tipc_sk_mcast_rcv(peer_net, list, &inputq);
1660 __skb_queue_purge(list);
1661 skb_queue_purge(&inputq);
1662 }
1663 return;
1664 case GROUP_PROTOCOL:
1665 case CONN_MANAGER:
1666 tipc_loopback_trace(peer_net, list);
1667 spin_lock_init(&list->lock);
1668 tipc_sk_rcv(peer_net, list);
1669 return;
1670 case LINK_PROTOCOL:
1671 case NAME_DISTRIBUTOR:
1672 case TUNNEL_PROTOCOL:
1673 case BCAST_PROTOCOL:
1674 return;
1675 default:
1676 return;
1677 }
1678 }
1679
1680 /**
1681 * tipc_node_xmit() - general link level function for message sending
1682 * @net: the applicable net namespace
1683 * @list: chain of buffers containing message
1684 * @dnode: address of destination node
1685 * @selector: a number used for deterministic link selection
1686 * Consumes the buffer chain.
1687 * Return: 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1688 */
tipc_node_xmit(struct net * net,struct sk_buff_head * list,u32 dnode,int selector)1689 int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1690 u32 dnode, int selector)
1691 {
1692 struct tipc_link_entry *le = NULL;
1693 struct tipc_node *n;
1694 struct sk_buff_head xmitq;
1695 bool node_up = false;
1696 struct net *peer_net;
1697 int bearer_id;
1698 int rc;
1699
1700 if (in_own_node(net, dnode)) {
1701 tipc_loopback_trace(net, list);
1702 spin_lock_init(&list->lock);
1703 tipc_sk_rcv(net, list);
1704 return 0;
1705 }
1706
1707 n = tipc_node_find(net, dnode);
1708 if (unlikely(!n)) {
1709 __skb_queue_purge(list);
1710 return -EHOSTUNREACH;
1711 }
1712
1713 rcu_read_lock();
1714 tipc_node_read_lock(n);
1715 node_up = node_is_up(n);
1716 peer_net = n->peer_net;
1717 tipc_node_read_unlock(n);
1718 if (node_up && peer_net && check_net(peer_net)) {
1719 /* xmit inner linux container */
1720 tipc_lxc_xmit(peer_net, list);
1721 if (likely(skb_queue_empty(list))) {
1722 rcu_read_unlock();
1723 tipc_node_put(n);
1724 return 0;
1725 }
1726 }
1727 rcu_read_unlock();
1728
1729 tipc_node_read_lock(n);
1730 bearer_id = n->active_links[selector & 1];
1731 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1732 tipc_node_read_unlock(n);
1733 tipc_node_put(n);
1734 __skb_queue_purge(list);
1735 return -EHOSTUNREACH;
1736 }
1737
1738 __skb_queue_head_init(&xmitq);
1739 le = &n->links[bearer_id];
1740 spin_lock_bh(&le->lock);
1741 rc = tipc_link_xmit(le->link, list, &xmitq);
1742 spin_unlock_bh(&le->lock);
1743 tipc_node_read_unlock(n);
1744
1745 if (unlikely(rc == -ENOBUFS))
1746 tipc_node_link_down(n, bearer_id, false);
1747 else
1748 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1749
1750 tipc_node_put(n);
1751
1752 return rc;
1753 }
1754
1755 /* tipc_node_xmit_skb(): send single buffer to destination
1756 * Buffers sent via this function are generally TIPC_SYSTEM_IMPORTANCE
1757 * messages, which will not be rejected
1758 * The only exception is datagram messages rerouted after secondary
1759 * lookup, which are rare and safe to dispose of anyway.
1760 */
tipc_node_xmit_skb(struct net * net,struct sk_buff * skb,u32 dnode,u32 selector)1761 int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1762 u32 selector)
1763 {
1764 struct sk_buff_head head;
1765
1766 __skb_queue_head_init(&head);
1767 __skb_queue_tail(&head, skb);
1768 tipc_node_xmit(net, &head, dnode, selector);
1769 return 0;
1770 }
1771
1772 /* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1773 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1774 */
tipc_node_distr_xmit(struct net * net,struct sk_buff_head * xmitq)1775 int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1776 {
1777 struct sk_buff *skb;
1778 u32 selector, dnode;
1779
1780 while ((skb = __skb_dequeue(xmitq))) {
1781 selector = msg_origport(buf_msg(skb));
1782 dnode = msg_destnode(buf_msg(skb));
1783 tipc_node_xmit_skb(net, skb, dnode, selector);
1784 }
1785 return 0;
1786 }
1787
tipc_node_broadcast(struct net * net,struct sk_buff * skb,int rc_dests)1788 void tipc_node_broadcast(struct net *net, struct sk_buff *skb, int rc_dests)
1789 {
1790 struct sk_buff_head xmitq;
1791 struct sk_buff *txskb;
1792 struct tipc_node *n;
1793 u16 dummy;
1794 u32 dst;
1795
1796 /* Use broadcast if all nodes support it */
1797 if (!rc_dests && tipc_bcast_get_mode(net) != BCLINK_MODE_RCAST) {
1798 __skb_queue_head_init(&xmitq);
1799 __skb_queue_tail(&xmitq, skb);
1800 tipc_bcast_xmit(net, &xmitq, &dummy);
1801 return;
1802 }
1803
1804 /* Otherwise use legacy replicast method */
1805 rcu_read_lock();
1806 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1807 dst = n->addr;
1808 if (in_own_node(net, dst))
1809 continue;
1810 if (!node_is_up(n))
1811 continue;
1812 txskb = pskb_copy(skb, GFP_ATOMIC);
1813 if (!txskb)
1814 break;
1815 msg_set_destnode(buf_msg(txskb), dst);
1816 tipc_node_xmit_skb(net, txskb, dst, 0);
1817 }
1818 rcu_read_unlock();
1819 kfree_skb(skb);
1820 }
1821
tipc_node_mcast_rcv(struct tipc_node * n)1822 static void tipc_node_mcast_rcv(struct tipc_node *n)
1823 {
1824 struct tipc_bclink_entry *be = &n->bc_entry;
1825
1826 /* 'arrvq' is under inputq2's lock protection */
1827 spin_lock_bh(&be->inputq2.lock);
1828 spin_lock_bh(&be->inputq1.lock);
1829 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1830 spin_unlock_bh(&be->inputq1.lock);
1831 spin_unlock_bh(&be->inputq2.lock);
1832 tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1833 }
1834
tipc_node_bc_sync_rcv(struct tipc_node * n,struct tipc_msg * hdr,int bearer_id,struct sk_buff_head * xmitq)1835 static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1836 int bearer_id, struct sk_buff_head *xmitq)
1837 {
1838 struct tipc_link *ucl;
1839 int rc;
1840
1841 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr, xmitq);
1842
1843 if (rc & TIPC_LINK_DOWN_EVT) {
1844 tipc_node_reset_links(n);
1845 return;
1846 }
1847
1848 if (!(rc & TIPC_LINK_SND_STATE))
1849 return;
1850
1851 /* If probe message, a STATE response will be sent anyway */
1852 if (msg_probe(hdr))
1853 return;
1854
1855 /* Produce a STATE message carrying broadcast NACK */
1856 tipc_node_read_lock(n);
1857 ucl = n->links[bearer_id].link;
1858 if (ucl)
1859 tipc_link_build_state_msg(ucl, xmitq);
1860 tipc_node_read_unlock(n);
1861 }
1862
1863 /**
1864 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1865 * @net: the applicable net namespace
1866 * @skb: TIPC packet
1867 * @bearer_id: id of bearer message arrived on
1868 *
1869 * Invoked with no locks held.
1870 */
tipc_node_bc_rcv(struct net * net,struct sk_buff * skb,int bearer_id)1871 static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1872 {
1873 int rc;
1874 struct sk_buff_head xmitq;
1875 struct tipc_bclink_entry *be;
1876 struct tipc_link_entry *le;
1877 struct tipc_msg *hdr = buf_msg(skb);
1878 int usr = msg_user(hdr);
1879 u32 dnode = msg_destnode(hdr);
1880 struct tipc_node *n;
1881
1882 __skb_queue_head_init(&xmitq);
1883
1884 /* If NACK for other node, let rcv link for that node peek into it */
1885 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1886 n = tipc_node_find(net, dnode);
1887 else
1888 n = tipc_node_find(net, msg_prevnode(hdr));
1889 if (!n) {
1890 kfree_skb(skb);
1891 return;
1892 }
1893 be = &n->bc_entry;
1894 le = &n->links[bearer_id];
1895
1896 rc = tipc_bcast_rcv(net, be->link, skb);
1897
1898 /* Broadcast ACKs are sent on a unicast link */
1899 if (rc & TIPC_LINK_SND_STATE) {
1900 tipc_node_read_lock(n);
1901 tipc_link_build_state_msg(le->link, &xmitq);
1902 tipc_node_read_unlock(n);
1903 }
1904
1905 if (!skb_queue_empty(&xmitq))
1906 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
1907
1908 if (!skb_queue_empty(&be->inputq1))
1909 tipc_node_mcast_rcv(n);
1910
1911 /* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
1912 if (!skb_queue_empty(&n->bc_entry.namedq))
1913 tipc_named_rcv(net, &n->bc_entry.namedq,
1914 &n->bc_entry.named_rcv_nxt,
1915 &n->bc_entry.named_open);
1916
1917 /* If reassembly or retransmission failure => reset all links to peer */
1918 if (rc & TIPC_LINK_DOWN_EVT)
1919 tipc_node_reset_links(n);
1920
1921 tipc_node_put(n);
1922 }
1923
1924 /**
1925 * tipc_node_check_state - check and if necessary update node state
1926 * @n: target tipc_node
1927 * @skb: TIPC packet
1928 * @bearer_id: identity of bearer delivering the packet
1929 * @xmitq: queue for messages to be xmited on
1930 * Return: true if state and msg are ok, otherwise false
1931 */
tipc_node_check_state(struct tipc_node * n,struct sk_buff * skb,int bearer_id,struct sk_buff_head * xmitq)1932 static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1933 int bearer_id, struct sk_buff_head *xmitq)
1934 {
1935 struct tipc_msg *hdr = buf_msg(skb);
1936 int usr = msg_user(hdr);
1937 int mtyp = msg_type(hdr);
1938 u16 oseqno = msg_seqno(hdr);
1939 u16 exp_pkts = msg_msgcnt(hdr);
1940 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1941 int state = n->state;
1942 struct tipc_link *l, *tnl, *pl = NULL;
1943 struct tipc_media_addr *maddr;
1944 int pb_id;
1945
1946 if (trace_tipc_node_check_state_enabled()) {
1947 trace_tipc_skb_dump(skb, false, "skb for node state check");
1948 trace_tipc_node_check_state(n, true, " ");
1949 }
1950 l = n->links[bearer_id].link;
1951 if (!l)
1952 return false;
1953 rcv_nxt = tipc_link_rcv_nxt(l);
1954
1955
1956 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1957 return true;
1958
1959 /* Find parallel link, if any */
1960 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1961 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1962 pl = n->links[pb_id].link;
1963 break;
1964 }
1965 }
1966
1967 if (!tipc_link_validate_msg(l, hdr)) {
1968 trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
1969 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
1970 return false;
1971 }
1972
1973 /* Check and update node accesibility if applicable */
1974 if (state == SELF_UP_PEER_COMING) {
1975 if (!tipc_link_is_up(l))
1976 return true;
1977 if (!msg_peer_link_is_up(hdr))
1978 return true;
1979 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1980 }
1981
1982 if (state == SELF_DOWN_PEER_LEAVING) {
1983 if (msg_peer_node_is_up(hdr))
1984 return false;
1985 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1986 return true;
1987 }
1988
1989 if (state == SELF_LEAVING_PEER_DOWN)
1990 return false;
1991
1992 /* Ignore duplicate packets */
1993 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1994 return true;
1995
1996 /* Initiate or update failover mode if applicable */
1997 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1998 syncpt = oseqno + exp_pkts - 1;
1999 if (pl && !tipc_link_is_reset(pl)) {
2000 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
2001 trace_tipc_node_link_down(n, true,
2002 "node link down <- failover!");
2003 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
2004 tipc_link_inputq(l));
2005 }
2006
2007 /* If parallel link was already down, and this happened before
2008 * the tunnel link came up, node failover was never started.
2009 * Ensure that a FAILOVER_MSG is sent to get peer out of
2010 * NODE_FAILINGOVER state, also this node must accept
2011 * TUNNEL_MSGs from peer.
2012 */
2013 if (n->state != NODE_FAILINGOVER)
2014 tipc_node_link_failover(n, pl, l, xmitq);
2015
2016 /* If pkts arrive out of order, use lowest calculated syncpt */
2017 if (less(syncpt, n->sync_point))
2018 n->sync_point = syncpt;
2019 }
2020
2021 /* Open parallel link when tunnel link reaches synch point */
2022 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
2023 if (!more(rcv_nxt, n->sync_point))
2024 return true;
2025 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
2026 if (pl)
2027 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
2028 return true;
2029 }
2030
2031 /* No syncing needed if only one link */
2032 if (!pl || !tipc_link_is_up(pl))
2033 return true;
2034
2035 /* Initiate synch mode if applicable */
2036 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
2037 if (n->capabilities & TIPC_TUNNEL_ENHANCED)
2038 syncpt = msg_syncpt(hdr);
2039 else
2040 syncpt = msg_seqno(msg_inner_hdr(hdr)) + exp_pkts - 1;
2041 if (!tipc_link_is_up(l))
2042 __tipc_node_link_up(n, bearer_id, xmitq);
2043 if (n->state == SELF_UP_PEER_UP) {
2044 n->sync_point = syncpt;
2045 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
2046 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
2047 }
2048 }
2049
2050 /* Open tunnel link when parallel link reaches synch point */
2051 if (n->state == NODE_SYNCHING) {
2052 if (tipc_link_is_synching(l)) {
2053 tnl = l;
2054 } else {
2055 tnl = pl;
2056 pl = l;
2057 }
2058 inputq_len = skb_queue_len(tipc_link_inputq(pl));
2059 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
2060 if (more(dlv_nxt, n->sync_point)) {
2061 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
2062 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
2063 return true;
2064 }
2065 if (l == pl)
2066 return true;
2067 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
2068 return true;
2069 if (usr == LINK_PROTOCOL)
2070 return true;
2071 return false;
2072 }
2073 return true;
2074 }
2075
2076 /**
2077 * tipc_rcv - process TIPC packets/messages arriving from off-node
2078 * @net: the applicable net namespace
2079 * @skb: TIPC packet
2080 * @b: pointer to bearer message arrived on
2081 *
2082 * Invoked with no locks held. Bearer pointer must point to a valid bearer
2083 * structure (i.e. cannot be NULL), but bearer can be inactive.
2084 */
tipc_rcv(struct net * net,struct sk_buff * skb,struct tipc_bearer * b)2085 void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
2086 {
2087 struct sk_buff_head xmitq;
2088 struct tipc_link_entry *le;
2089 struct tipc_msg *hdr;
2090 struct tipc_node *n;
2091 int bearer_id = b->identity;
2092 u32 self = tipc_own_addr(net);
2093 int usr, rc = 0;
2094 u16 bc_ack;
2095 #ifdef CONFIG_TIPC_CRYPTO
2096 struct tipc_ehdr *ehdr;
2097
2098 /* Check if message must be decrypted first */
2099 if (TIPC_SKB_CB(skb)->decrypted || !tipc_ehdr_validate(skb))
2100 goto rcv;
2101
2102 ehdr = (struct tipc_ehdr *)skb->data;
2103 if (likely(ehdr->user != LINK_CONFIG)) {
2104 n = tipc_node_find(net, ntohl(ehdr->addr));
2105 if (unlikely(!n))
2106 goto discard;
2107 } else {
2108 n = tipc_node_find_by_id(net, ehdr->id);
2109 }
2110 skb_dst_force(skb);
2111 tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b);
2112 if (!skb)
2113 return;
2114
2115 rcv:
2116 #endif
2117 /* Ensure message is well-formed before touching the header */
2118 if (unlikely(!tipc_msg_validate(&skb)))
2119 goto discard;
2120 __skb_queue_head_init(&xmitq);
2121 hdr = buf_msg(skb);
2122 usr = msg_user(hdr);
2123 bc_ack = msg_bcast_ack(hdr);
2124
2125 /* Handle arrival of discovery or broadcast packet */
2126 if (unlikely(msg_non_seq(hdr))) {
2127 if (unlikely(usr == LINK_CONFIG))
2128 return tipc_disc_rcv(net, skb, b);
2129 else
2130 return tipc_node_bc_rcv(net, skb, bearer_id);
2131 }
2132
2133 /* Discard unicast link messages destined for another node */
2134 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
2135 goto discard;
2136
2137 /* Locate neighboring node that sent packet */
2138 n = tipc_node_find(net, msg_prevnode(hdr));
2139 if (unlikely(!n))
2140 goto discard;
2141 le = &n->links[bearer_id];
2142
2143 /* Ensure broadcast reception is in synch with peer's send state */
2144 if (unlikely(usr == LINK_PROTOCOL)) {
2145 if (unlikely(skb_linearize(skb))) {
2146 tipc_node_put(n);
2147 goto discard;
2148 }
2149 hdr = buf_msg(skb);
2150 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
2151 } else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack)) {
2152 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
2153 }
2154
2155 /* Receive packet directly if conditions permit */
2156 tipc_node_read_lock(n);
2157 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
2158 spin_lock_bh(&le->lock);
2159 if (le->link) {
2160 rc = tipc_link_rcv(le->link, skb, &xmitq);
2161 skb = NULL;
2162 }
2163 spin_unlock_bh(&le->lock);
2164 }
2165 tipc_node_read_unlock(n);
2166
2167 /* Check/update node state before receiving */
2168 if (unlikely(skb)) {
2169 if (unlikely(skb_linearize(skb)))
2170 goto out_node_put;
2171 tipc_node_write_lock(n);
2172 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
2173 if (le->link) {
2174 rc = tipc_link_rcv(le->link, skb, &xmitq);
2175 skb = NULL;
2176 }
2177 }
2178 tipc_node_write_unlock(n);
2179 }
2180
2181 if (unlikely(rc & TIPC_LINK_UP_EVT))
2182 tipc_node_link_up(n, bearer_id, &xmitq);
2183
2184 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
2185 tipc_node_link_down(n, bearer_id, false);
2186
2187 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
2188 tipc_named_rcv(net, &n->bc_entry.namedq,
2189 &n->bc_entry.named_rcv_nxt,
2190 &n->bc_entry.named_open);
2191
2192 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
2193 tipc_node_mcast_rcv(n);
2194
2195 if (!skb_queue_empty(&le->inputq))
2196 tipc_sk_rcv(net, &le->inputq);
2197
2198 if (!skb_queue_empty(&xmitq))
2199 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
2200
2201 out_node_put:
2202 tipc_node_put(n);
2203 discard:
2204 kfree_skb(skb);
2205 }
2206
tipc_node_apply_property(struct net * net,struct tipc_bearer * b,int prop)2207 void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
2208 int prop)
2209 {
2210 struct tipc_net *tn = tipc_net(net);
2211 int bearer_id = b->identity;
2212 struct sk_buff_head xmitq;
2213 struct tipc_link_entry *e;
2214 struct tipc_node *n;
2215
2216 __skb_queue_head_init(&xmitq);
2217
2218 rcu_read_lock();
2219
2220 list_for_each_entry_rcu(n, &tn->node_list, list) {
2221 tipc_node_write_lock(n);
2222 e = &n->links[bearer_id];
2223 if (e->link) {
2224 if (prop == TIPC_NLA_PROP_TOL)
2225 tipc_link_set_tolerance(e->link, b->tolerance,
2226 &xmitq);
2227 else if (prop == TIPC_NLA_PROP_MTU)
2228 tipc_link_set_mtu(e->link, b->mtu);
2229
2230 /* Update MTU for node link entry */
2231 e->mtu = tipc_link_mss(e->link);
2232 }
2233
2234 tipc_node_write_unlock(n);
2235 tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
2236 }
2237
2238 rcu_read_unlock();
2239 }
2240
tipc_nl_peer_rm(struct sk_buff * skb,struct genl_info * info)2241 int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
2242 {
2243 struct net *net = sock_net(skb->sk);
2244 struct tipc_net *tn = net_generic(net, tipc_net_id);
2245 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
2246 struct tipc_node *peer, *temp_node;
2247 u8 node_id[NODE_ID_LEN];
2248 u64 *w0 = (u64 *)&node_id[0];
2249 u64 *w1 = (u64 *)&node_id[8];
2250 u32 addr;
2251 int err;
2252
2253 /* We identify the peer by its net */
2254 if (!info->attrs[TIPC_NLA_NET])
2255 return -EINVAL;
2256
2257 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
2258 info->attrs[TIPC_NLA_NET],
2259 tipc_nl_net_policy, info->extack);
2260 if (err)
2261 return err;
2262
2263 /* attrs[TIPC_NLA_NET_NODEID] and attrs[TIPC_NLA_NET_ADDR] are
2264 * mutually exclusive cases
2265 */
2266 if (attrs[TIPC_NLA_NET_ADDR]) {
2267 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
2268 if (!addr)
2269 return -EINVAL;
2270 }
2271
2272 if (attrs[TIPC_NLA_NET_NODEID]) {
2273 if (!attrs[TIPC_NLA_NET_NODEID_W1])
2274 return -EINVAL;
2275 *w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
2276 *w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
2277 addr = hash128to32(node_id);
2278 }
2279
2280 if (in_own_node(net, addr))
2281 return -ENOTSUPP;
2282
2283 spin_lock_bh(&tn->node_list_lock);
2284 peer = tipc_node_find(net, addr);
2285 if (!peer) {
2286 spin_unlock_bh(&tn->node_list_lock);
2287 return -ENXIO;
2288 }
2289
2290 tipc_node_write_lock(peer);
2291 if (peer->state != SELF_DOWN_PEER_DOWN &&
2292 peer->state != SELF_DOWN_PEER_LEAVING) {
2293 tipc_node_write_unlock(peer);
2294 err = -EBUSY;
2295 goto err_out;
2296 }
2297
2298 tipc_node_clear_links(peer);
2299 tipc_node_write_unlock(peer);
2300 tipc_node_delete(peer);
2301
2302 /* Calculate cluster capabilities */
2303 tn->capabilities = TIPC_NODE_CAPABILITIES;
2304 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
2305 tn->capabilities &= temp_node->capabilities;
2306 }
2307 tipc_bcast_toggle_rcast(net, (tn->capabilities & TIPC_BCAST_RCAST));
2308 err = 0;
2309 err_out:
2310 tipc_node_put(peer);
2311 spin_unlock_bh(&tn->node_list_lock);
2312
2313 return err;
2314 }
2315
tipc_nl_node_dump(struct sk_buff * skb,struct netlink_callback * cb)2316 int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
2317 {
2318 int err;
2319 struct net *net = sock_net(skb->sk);
2320 struct tipc_net *tn = net_generic(net, tipc_net_id);
2321 int done = cb->args[0];
2322 int last_addr = cb->args[1];
2323 struct tipc_node *node;
2324 struct tipc_nl_msg msg;
2325
2326 if (done)
2327 return 0;
2328
2329 msg.skb = skb;
2330 msg.portid = NETLINK_CB(cb->skb).portid;
2331 msg.seq = cb->nlh->nlmsg_seq;
2332
2333 rcu_read_lock();
2334 if (last_addr) {
2335 node = tipc_node_find(net, last_addr);
2336 if (!node) {
2337 rcu_read_unlock();
2338 /* We never set seq or call nl_dump_check_consistent()
2339 * this means that setting prev_seq here will cause the
2340 * consistence check to fail in the netlink callback
2341 * handler. Resulting in the NLMSG_DONE message having
2342 * the NLM_F_DUMP_INTR flag set if the node state
2343 * changed while we released the lock.
2344 */
2345 cb->prev_seq = 1;
2346 return -EPIPE;
2347 }
2348 tipc_node_put(node);
2349 }
2350
2351 list_for_each_entry_rcu(node, &tn->node_list, list) {
2352 if (node->preliminary)
2353 continue;
2354 if (last_addr) {
2355 if (node->addr == last_addr)
2356 last_addr = 0;
2357 else
2358 continue;
2359 }
2360
2361 tipc_node_read_lock(node);
2362 err = __tipc_nl_add_node(&msg, node);
2363 if (err) {
2364 last_addr = node->addr;
2365 tipc_node_read_unlock(node);
2366 goto out;
2367 }
2368
2369 tipc_node_read_unlock(node);
2370 }
2371 done = 1;
2372 out:
2373 cb->args[0] = done;
2374 cb->args[1] = last_addr;
2375 rcu_read_unlock();
2376
2377 return skb->len;
2378 }
2379
2380 /* tipc_node_find_by_name - locate owner node of link by link's name
2381 * @net: the applicable net namespace
2382 * @name: pointer to link name string
2383 * @bearer_id: pointer to index in 'node->links' array where the link was found.
2384 *
2385 * Returns pointer to node owning the link, or 0 if no matching link is found.
2386 */
tipc_node_find_by_name(struct net * net,const char * link_name,unsigned int * bearer_id)2387 static struct tipc_node *tipc_node_find_by_name(struct net *net,
2388 const char *link_name,
2389 unsigned int *bearer_id)
2390 {
2391 struct tipc_net *tn = net_generic(net, tipc_net_id);
2392 struct tipc_link *l;
2393 struct tipc_node *n;
2394 struct tipc_node *found_node = NULL;
2395 int i;
2396
2397 *bearer_id = 0;
2398 rcu_read_lock();
2399 list_for_each_entry_rcu(n, &tn->node_list, list) {
2400 tipc_node_read_lock(n);
2401 for (i = 0; i < MAX_BEARERS; i++) {
2402 l = n->links[i].link;
2403 if (l && !strcmp(tipc_link_name(l), link_name)) {
2404 *bearer_id = i;
2405 found_node = n;
2406 break;
2407 }
2408 }
2409 tipc_node_read_unlock(n);
2410 if (found_node)
2411 break;
2412 }
2413 rcu_read_unlock();
2414
2415 return found_node;
2416 }
2417
tipc_nl_node_set_link(struct sk_buff * skb,struct genl_info * info)2418 int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
2419 {
2420 int err;
2421 int res = 0;
2422 int bearer_id;
2423 char *name;
2424 struct tipc_link *link;
2425 struct tipc_node *node;
2426 struct sk_buff_head xmitq;
2427 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2428 struct net *net = sock_net(skb->sk);
2429
2430 __skb_queue_head_init(&xmitq);
2431
2432 if (!info->attrs[TIPC_NLA_LINK])
2433 return -EINVAL;
2434
2435 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2436 info->attrs[TIPC_NLA_LINK],
2437 tipc_nl_link_policy, info->extack);
2438 if (err)
2439 return err;
2440
2441 if (!attrs[TIPC_NLA_LINK_NAME])
2442 return -EINVAL;
2443
2444 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2445
2446 if (strcmp(name, tipc_bclink_name) == 0)
2447 return tipc_nl_bc_link_set(net, attrs);
2448
2449 node = tipc_node_find_by_name(net, name, &bearer_id);
2450 if (!node)
2451 return -EINVAL;
2452
2453 tipc_node_read_lock(node);
2454
2455 link = node->links[bearer_id].link;
2456 if (!link) {
2457 res = -EINVAL;
2458 goto out;
2459 }
2460
2461 if (attrs[TIPC_NLA_LINK_PROP]) {
2462 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2463
2464 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
2465 if (err) {
2466 res = err;
2467 goto out;
2468 }
2469
2470 if (props[TIPC_NLA_PROP_TOL]) {
2471 u32 tol;
2472
2473 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2474 tipc_link_set_tolerance(link, tol, &xmitq);
2475 }
2476 if (props[TIPC_NLA_PROP_PRIO]) {
2477 u32 prio;
2478
2479 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2480 tipc_link_set_prio(link, prio, &xmitq);
2481 }
2482 if (props[TIPC_NLA_PROP_WIN]) {
2483 u32 max_win;
2484
2485 max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2486 tipc_link_set_queue_limits(link,
2487 tipc_link_min_win(link),
2488 max_win);
2489 }
2490 }
2491
2492 out:
2493 tipc_node_read_unlock(node);
2494 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr,
2495 NULL);
2496 return res;
2497 }
2498
tipc_nl_node_get_link(struct sk_buff * skb,struct genl_info * info)2499 int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
2500 {
2501 struct net *net = genl_info_net(info);
2502 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2503 struct tipc_nl_msg msg;
2504 char *name;
2505 int err;
2506
2507 msg.portid = info->snd_portid;
2508 msg.seq = info->snd_seq;
2509
2510 if (!info->attrs[TIPC_NLA_LINK])
2511 return -EINVAL;
2512
2513 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2514 info->attrs[TIPC_NLA_LINK],
2515 tipc_nl_link_policy, info->extack);
2516 if (err)
2517 return err;
2518
2519 if (!attrs[TIPC_NLA_LINK_NAME])
2520 return -EINVAL;
2521
2522 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2523
2524 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2525 if (!msg.skb)
2526 return -ENOMEM;
2527
2528 if (strcmp(name, tipc_bclink_name) == 0) {
2529 err = tipc_nl_add_bc_link(net, &msg, tipc_net(net)->bcl);
2530 if (err)
2531 goto err_free;
2532 } else {
2533 int bearer_id;
2534 struct tipc_node *node;
2535 struct tipc_link *link;
2536
2537 node = tipc_node_find_by_name(net, name, &bearer_id);
2538 if (!node) {
2539 err = -EINVAL;
2540 goto err_free;
2541 }
2542
2543 tipc_node_read_lock(node);
2544 link = node->links[bearer_id].link;
2545 if (!link) {
2546 tipc_node_read_unlock(node);
2547 err = -EINVAL;
2548 goto err_free;
2549 }
2550
2551 err = __tipc_nl_add_link(net, &msg, link, 0);
2552 tipc_node_read_unlock(node);
2553 if (err)
2554 goto err_free;
2555 }
2556
2557 return genlmsg_reply(msg.skb, info);
2558
2559 err_free:
2560 nlmsg_free(msg.skb);
2561 return err;
2562 }
2563
tipc_nl_node_reset_link_stats(struct sk_buff * skb,struct genl_info * info)2564 int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2565 {
2566 int err;
2567 char *link_name;
2568 unsigned int bearer_id;
2569 struct tipc_link *link;
2570 struct tipc_node *node;
2571 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2572 struct net *net = sock_net(skb->sk);
2573 struct tipc_net *tn = tipc_net(net);
2574 struct tipc_link_entry *le;
2575
2576 if (!info->attrs[TIPC_NLA_LINK])
2577 return -EINVAL;
2578
2579 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2580 info->attrs[TIPC_NLA_LINK],
2581 tipc_nl_link_policy, info->extack);
2582 if (err)
2583 return err;
2584
2585 if (!attrs[TIPC_NLA_LINK_NAME])
2586 return -EINVAL;
2587
2588 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2589
2590 err = -EINVAL;
2591 if (!strcmp(link_name, tipc_bclink_name)) {
2592 err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
2593 if (err)
2594 return err;
2595 return 0;
2596 } else if (strstr(link_name, tipc_bclink_name)) {
2597 rcu_read_lock();
2598 list_for_each_entry_rcu(node, &tn->node_list, list) {
2599 tipc_node_read_lock(node);
2600 link = node->bc_entry.link;
2601 if (link && !strcmp(link_name, tipc_link_name(link))) {
2602 err = tipc_bclink_reset_stats(net, link);
2603 tipc_node_read_unlock(node);
2604 break;
2605 }
2606 tipc_node_read_unlock(node);
2607 }
2608 rcu_read_unlock();
2609 return err;
2610 }
2611
2612 node = tipc_node_find_by_name(net, link_name, &bearer_id);
2613 if (!node)
2614 return -EINVAL;
2615
2616 le = &node->links[bearer_id];
2617 tipc_node_read_lock(node);
2618 spin_lock_bh(&le->lock);
2619 link = node->links[bearer_id].link;
2620 if (!link) {
2621 spin_unlock_bh(&le->lock);
2622 tipc_node_read_unlock(node);
2623 return -EINVAL;
2624 }
2625 tipc_link_reset_stats(link);
2626 spin_unlock_bh(&le->lock);
2627 tipc_node_read_unlock(node);
2628 return 0;
2629 }
2630
2631 /* 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)2632 static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2633 struct tipc_node *node, u32 *prev_link,
2634 bool bc_link)
2635 {
2636 u32 i;
2637 int err;
2638
2639 for (i = *prev_link; i < MAX_BEARERS; i++) {
2640 *prev_link = i;
2641
2642 if (!node->links[i].link)
2643 continue;
2644
2645 err = __tipc_nl_add_link(net, msg,
2646 node->links[i].link, NLM_F_MULTI);
2647 if (err)
2648 return err;
2649 }
2650
2651 if (bc_link) {
2652 *prev_link = i;
2653 err = tipc_nl_add_bc_link(net, msg, node->bc_entry.link);
2654 if (err)
2655 return err;
2656 }
2657
2658 *prev_link = 0;
2659
2660 return 0;
2661 }
2662
tipc_nl_node_dump_link(struct sk_buff * skb,struct netlink_callback * cb)2663 int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2664 {
2665 struct net *net = sock_net(skb->sk);
2666 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
2667 struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
2668 struct tipc_net *tn = net_generic(net, tipc_net_id);
2669 struct tipc_node *node;
2670 struct tipc_nl_msg msg;
2671 u32 prev_node = cb->args[0];
2672 u32 prev_link = cb->args[1];
2673 int done = cb->args[2];
2674 bool bc_link = cb->args[3];
2675 int err;
2676
2677 if (done)
2678 return 0;
2679
2680 if (!prev_node) {
2681 /* Check if broadcast-receiver links dumping is needed */
2682 if (attrs && attrs[TIPC_NLA_LINK]) {
2683 err = nla_parse_nested_deprecated(link,
2684 TIPC_NLA_LINK_MAX,
2685 attrs[TIPC_NLA_LINK],
2686 tipc_nl_link_policy,
2687 NULL);
2688 if (unlikely(err))
2689 return err;
2690 if (unlikely(!link[TIPC_NLA_LINK_BROADCAST]))
2691 return -EINVAL;
2692 bc_link = true;
2693 }
2694 }
2695
2696 msg.skb = skb;
2697 msg.portid = NETLINK_CB(cb->skb).portid;
2698 msg.seq = cb->nlh->nlmsg_seq;
2699
2700 rcu_read_lock();
2701 if (prev_node) {
2702 node = tipc_node_find(net, prev_node);
2703 if (!node) {
2704 /* We never set seq or call nl_dump_check_consistent()
2705 * this means that setting prev_seq here will cause the
2706 * consistence check to fail in the netlink callback
2707 * handler. Resulting in the last NLMSG_DONE message
2708 * having the NLM_F_DUMP_INTR flag set.
2709 */
2710 cb->prev_seq = 1;
2711 goto out;
2712 }
2713 tipc_node_put(node);
2714
2715 list_for_each_entry_continue_rcu(node, &tn->node_list,
2716 list) {
2717 tipc_node_read_lock(node);
2718 err = __tipc_nl_add_node_links(net, &msg, node,
2719 &prev_link, bc_link);
2720 tipc_node_read_unlock(node);
2721 if (err)
2722 goto out;
2723
2724 prev_node = node->addr;
2725 }
2726 } else {
2727 err = tipc_nl_add_bc_link(net, &msg, tn->bcl);
2728 if (err)
2729 goto out;
2730
2731 list_for_each_entry_rcu(node, &tn->node_list, list) {
2732 tipc_node_read_lock(node);
2733 err = __tipc_nl_add_node_links(net, &msg, node,
2734 &prev_link, bc_link);
2735 tipc_node_read_unlock(node);
2736 if (err)
2737 goto out;
2738
2739 prev_node = node->addr;
2740 }
2741 }
2742 done = 1;
2743 out:
2744 rcu_read_unlock();
2745
2746 cb->args[0] = prev_node;
2747 cb->args[1] = prev_link;
2748 cb->args[2] = done;
2749 cb->args[3] = bc_link;
2750
2751 return skb->len;
2752 }
2753
tipc_nl_node_set_monitor(struct sk_buff * skb,struct genl_info * info)2754 int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2755 {
2756 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2757 struct net *net = sock_net(skb->sk);
2758 int err;
2759
2760 if (!info->attrs[TIPC_NLA_MON])
2761 return -EINVAL;
2762
2763 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
2764 info->attrs[TIPC_NLA_MON],
2765 tipc_nl_monitor_policy,
2766 info->extack);
2767 if (err)
2768 return err;
2769
2770 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2771 u32 val;
2772
2773 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2774 err = tipc_nl_monitor_set_threshold(net, val);
2775 if (err)
2776 return err;
2777 }
2778
2779 return 0;
2780 }
2781
__tipc_nl_add_monitor_prop(struct net * net,struct tipc_nl_msg * msg)2782 static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2783 {
2784 struct nlattr *attrs;
2785 void *hdr;
2786 u32 val;
2787
2788 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2789 0, TIPC_NL_MON_GET);
2790 if (!hdr)
2791 return -EMSGSIZE;
2792
2793 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
2794 if (!attrs)
2795 goto msg_full;
2796
2797 val = tipc_nl_monitor_get_threshold(net);
2798
2799 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2800 goto attr_msg_full;
2801
2802 nla_nest_end(msg->skb, attrs);
2803 genlmsg_end(msg->skb, hdr);
2804
2805 return 0;
2806
2807 attr_msg_full:
2808 nla_nest_cancel(msg->skb, attrs);
2809 msg_full:
2810 genlmsg_cancel(msg->skb, hdr);
2811
2812 return -EMSGSIZE;
2813 }
2814
tipc_nl_node_get_monitor(struct sk_buff * skb,struct genl_info * info)2815 int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2816 {
2817 struct net *net = sock_net(skb->sk);
2818 struct tipc_nl_msg msg;
2819 int err;
2820
2821 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2822 if (!msg.skb)
2823 return -ENOMEM;
2824 msg.portid = info->snd_portid;
2825 msg.seq = info->snd_seq;
2826
2827 err = __tipc_nl_add_monitor_prop(net, &msg);
2828 if (err) {
2829 nlmsg_free(msg.skb);
2830 return err;
2831 }
2832
2833 return genlmsg_reply(msg.skb, info);
2834 }
2835
tipc_nl_node_dump_monitor(struct sk_buff * skb,struct netlink_callback * cb)2836 int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2837 {
2838 struct net *net = sock_net(skb->sk);
2839 u32 prev_bearer = cb->args[0];
2840 struct tipc_nl_msg msg;
2841 int bearer_id;
2842 int err;
2843
2844 if (prev_bearer == MAX_BEARERS)
2845 return 0;
2846
2847 msg.skb = skb;
2848 msg.portid = NETLINK_CB(cb->skb).portid;
2849 msg.seq = cb->nlh->nlmsg_seq;
2850
2851 rtnl_lock();
2852 for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2853 err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2854 if (err)
2855 break;
2856 }
2857 rtnl_unlock();
2858 cb->args[0] = bearer_id;
2859
2860 return skb->len;
2861 }
2862
tipc_nl_node_dump_monitor_peer(struct sk_buff * skb,struct netlink_callback * cb)2863 int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2864 struct netlink_callback *cb)
2865 {
2866 struct net *net = sock_net(skb->sk);
2867 u32 prev_node = cb->args[1];
2868 u32 bearer_id = cb->args[2];
2869 int done = cb->args[0];
2870 struct tipc_nl_msg msg;
2871 int err;
2872
2873 if (!prev_node) {
2874 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
2875 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2876
2877 if (!attrs[TIPC_NLA_MON])
2878 return -EINVAL;
2879
2880 err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
2881 attrs[TIPC_NLA_MON],
2882 tipc_nl_monitor_policy,
2883 NULL);
2884 if (err)
2885 return err;
2886
2887 if (!mon[TIPC_NLA_MON_REF])
2888 return -EINVAL;
2889
2890 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2891
2892 if (bearer_id >= MAX_BEARERS)
2893 return -EINVAL;
2894 }
2895
2896 if (done)
2897 return 0;
2898
2899 msg.skb = skb;
2900 msg.portid = NETLINK_CB(cb->skb).portid;
2901 msg.seq = cb->nlh->nlmsg_seq;
2902
2903 rtnl_lock();
2904 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2905 if (!err)
2906 done = 1;
2907
2908 rtnl_unlock();
2909 cb->args[0] = done;
2910 cb->args[1] = prev_node;
2911 cb->args[2] = bearer_id;
2912
2913 return skb->len;
2914 }
2915
2916 #ifdef CONFIG_TIPC_CRYPTO
tipc_nl_retrieve_key(struct nlattr ** attrs,struct tipc_aead_key ** pkey)2917 static int tipc_nl_retrieve_key(struct nlattr **attrs,
2918 struct tipc_aead_key **pkey)
2919 {
2920 struct nlattr *attr = attrs[TIPC_NLA_NODE_KEY];
2921 struct tipc_aead_key *key;
2922
2923 if (!attr)
2924 return -ENODATA;
2925
2926 if (nla_len(attr) < sizeof(*key))
2927 return -EINVAL;
2928 key = (struct tipc_aead_key *)nla_data(attr);
2929 if (key->keylen > TIPC_AEAD_KEYLEN_MAX ||
2930 nla_len(attr) < tipc_aead_key_size(key))
2931 return -EINVAL;
2932
2933 *pkey = key;
2934 return 0;
2935 }
2936
tipc_nl_retrieve_nodeid(struct nlattr ** attrs,u8 ** node_id)2937 static int tipc_nl_retrieve_nodeid(struct nlattr **attrs, u8 **node_id)
2938 {
2939 struct nlattr *attr = attrs[TIPC_NLA_NODE_ID];
2940
2941 if (!attr)
2942 return -ENODATA;
2943
2944 if (nla_len(attr) < TIPC_NODEID_LEN)
2945 return -EINVAL;
2946
2947 *node_id = (u8 *)nla_data(attr);
2948 return 0;
2949 }
2950
tipc_nl_retrieve_rekeying(struct nlattr ** attrs,u32 * intv)2951 static int tipc_nl_retrieve_rekeying(struct nlattr **attrs, u32 *intv)
2952 {
2953 struct nlattr *attr = attrs[TIPC_NLA_NODE_REKEYING];
2954
2955 if (!attr)
2956 return -ENODATA;
2957
2958 *intv = nla_get_u32(attr);
2959 return 0;
2960 }
2961
__tipc_nl_node_set_key(struct sk_buff * skb,struct genl_info * info)2962 static int __tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
2963 {
2964 struct nlattr *attrs[TIPC_NLA_NODE_MAX + 1];
2965 struct net *net = sock_net(skb->sk);
2966 struct tipc_crypto *tx = tipc_net(net)->crypto_tx, *c = tx;
2967 struct tipc_node *n = NULL;
2968 struct tipc_aead_key *ukey;
2969 bool rekeying = true, master_key = false;
2970 u8 *id, *own_id, mode;
2971 u32 intv = 0;
2972 int rc = 0;
2973
2974 if (!info->attrs[TIPC_NLA_NODE])
2975 return -EINVAL;
2976
2977 rc = nla_parse_nested(attrs, TIPC_NLA_NODE_MAX,
2978 info->attrs[TIPC_NLA_NODE],
2979 tipc_nl_node_policy, info->extack);
2980 if (rc)
2981 return rc;
2982
2983 own_id = tipc_own_id(net);
2984 if (!own_id) {
2985 GENL_SET_ERR_MSG(info, "not found own node identity (set id?)");
2986 return -EPERM;
2987 }
2988
2989 rc = tipc_nl_retrieve_rekeying(attrs, &intv);
2990 if (rc == -ENODATA)
2991 rekeying = false;
2992
2993 rc = tipc_nl_retrieve_key(attrs, &ukey);
2994 if (rc == -ENODATA && rekeying)
2995 goto rekeying;
2996 else if (rc)
2997 return rc;
2998
2999 rc = tipc_aead_key_validate(ukey, info);
3000 if (rc)
3001 return rc;
3002
3003 rc = tipc_nl_retrieve_nodeid(attrs, &id);
3004 switch (rc) {
3005 case -ENODATA:
3006 mode = CLUSTER_KEY;
3007 master_key = !!(attrs[TIPC_NLA_NODE_KEY_MASTER]);
3008 break;
3009 case 0:
3010 mode = PER_NODE_KEY;
3011 if (memcmp(id, own_id, NODE_ID_LEN)) {
3012 n = tipc_node_find_by_id(net, id) ?:
3013 tipc_node_create(net, 0, id, 0xffffu, 0, true);
3014 if (unlikely(!n))
3015 return -ENOMEM;
3016 c = n->crypto_rx;
3017 }
3018 break;
3019 default:
3020 return rc;
3021 }
3022
3023 /* Initiate the TX/RX key */
3024 rc = tipc_crypto_key_init(c, ukey, mode, master_key);
3025 if (n)
3026 tipc_node_put(n);
3027
3028 if (unlikely(rc < 0)) {
3029 GENL_SET_ERR_MSG(info, "unable to initiate or attach new key");
3030 return rc;
3031 } else if (c == tx) {
3032 /* Distribute TX key but not master one */
3033 if (!master_key && tipc_crypto_key_distr(tx, rc, NULL))
3034 GENL_SET_ERR_MSG(info, "failed to replicate new key");
3035 rekeying:
3036 /* Schedule TX rekeying if needed */
3037 tipc_crypto_rekeying_sched(tx, rekeying, intv);
3038 }
3039
3040 return 0;
3041 }
3042
tipc_nl_node_set_key(struct sk_buff * skb,struct genl_info * info)3043 int tipc_nl_node_set_key(struct sk_buff *skb, struct genl_info *info)
3044 {
3045 int err;
3046
3047 rtnl_lock();
3048 err = __tipc_nl_node_set_key(skb, info);
3049 rtnl_unlock();
3050
3051 return err;
3052 }
3053
__tipc_nl_node_flush_key(struct sk_buff * skb,struct genl_info * info)3054 static int __tipc_nl_node_flush_key(struct sk_buff *skb,
3055 struct genl_info *info)
3056 {
3057 struct net *net = sock_net(skb->sk);
3058 struct tipc_net *tn = tipc_net(net);
3059 struct tipc_node *n;
3060
3061 tipc_crypto_key_flush(tn->crypto_tx);
3062 rcu_read_lock();
3063 list_for_each_entry_rcu(n, &tn->node_list, list)
3064 tipc_crypto_key_flush(n->crypto_rx);
3065 rcu_read_unlock();
3066
3067 return 0;
3068 }
3069
tipc_nl_node_flush_key(struct sk_buff * skb,struct genl_info * info)3070 int tipc_nl_node_flush_key(struct sk_buff *skb, struct genl_info *info)
3071 {
3072 int err;
3073
3074 rtnl_lock();
3075 err = __tipc_nl_node_flush_key(skb, info);
3076 rtnl_unlock();
3077
3078 return err;
3079 }
3080 #endif
3081
3082 /**
3083 * tipc_node_dump - dump TIPC node data
3084 * @n: tipc node to be dumped
3085 * @more: dump more?
3086 * - false: dump only tipc node data
3087 * - true: dump node link data as well
3088 * @buf: returned buffer of dump data in format
3089 */
tipc_node_dump(struct tipc_node * n,bool more,char * buf)3090 int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
3091 {
3092 int i = 0;
3093 size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
3094
3095 if (!n) {
3096 i += scnprintf(buf, sz, "node data: (null)\n");
3097 return i;
3098 }
3099
3100 i += scnprintf(buf, sz, "node data: %x", n->addr);
3101 i += scnprintf(buf + i, sz - i, " %x", n->state);
3102 i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
3103 i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
3104 i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
3105 i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
3106 i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
3107 i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
3108 i += scnprintf(buf + i, sz - i, " %u", n->working_links);
3109 i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
3110 i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
3111
3112 if (!more)
3113 return i;
3114
3115 i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
3116 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
3117 i += scnprintf(buf + i, sz - i, " media: ");
3118 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
3119 i += scnprintf(buf + i, sz - i, "\n");
3120 i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
3121 i += scnprintf(buf + i, sz - i, " inputq: ");
3122 i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
3123
3124 i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
3125 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
3126 i += scnprintf(buf + i, sz - i, " media: ");
3127 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
3128 i += scnprintf(buf + i, sz - i, "\n");
3129 i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
3130 i += scnprintf(buf + i, sz - i, " inputq: ");
3131 i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
3132
3133 i += scnprintf(buf + i, sz - i, "bclink:\n ");
3134 i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
3135
3136 return i;
3137 }
3138
tipc_node_pre_cleanup_net(struct net * exit_net)3139 void tipc_node_pre_cleanup_net(struct net *exit_net)
3140 {
3141 struct tipc_node *n;
3142 struct tipc_net *tn;
3143 struct net *tmp;
3144
3145 rcu_read_lock();
3146 for_each_net_rcu(tmp) {
3147 if (tmp == exit_net)
3148 continue;
3149 tn = tipc_net(tmp);
3150 if (!tn)
3151 continue;
3152 spin_lock_bh(&tn->node_list_lock);
3153 list_for_each_entry_rcu(n, &tn->node_list, list) {
3154 if (!n->peer_net)
3155 continue;
3156 if (n->peer_net != exit_net)
3157 continue;
3158 tipc_node_write_lock(n);
3159 n->peer_net = NULL;
3160 n->peer_hash_mix = 0;
3161 tipc_node_write_unlock_fast(n);
3162 break;
3163 }
3164 spin_unlock_bh(&tn->node_list_lock);
3165 }
3166 rcu_read_unlock();
3167 }
3168