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