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Linux 5.2
[linux-2.6/linux-2.6-arm.git] / net / tipc / node.c
blob550581d47d51d006df1a6cd734f816aac373fcc6
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
48 #define INVALID_NODE_SIG 0x10000
49 #define NODE_CLEANUP_AFTER 300000
50
51 /* Flags used to take different actions according to flag type
52 * TIPC_NOTIFY_NODE_DOWN: notify node is down
53 * TIPC_NOTIFY_NODE_UP: notify node is up
54 * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
55 */
56 enum {
57 TIPC_NOTIFY_NODE_DOWN = (1 << 3),
58 TIPC_NOTIFY_NODE_UP = (1 << 4),
59 TIPC_NOTIFY_LINK_UP = (1 << 6),
60 TIPC_NOTIFY_LINK_DOWN = (1 << 7)
61 };
62
63 struct tipc_link_entry {
64 struct tipc_link *link;
65 spinlock_t lock; /* per link */
66 u32 mtu;
67 struct sk_buff_head inputq;
68 struct tipc_media_addr maddr;
69 };
70
71 struct tipc_bclink_entry {
72 struct tipc_link *link;
73 struct sk_buff_head inputq1;
74 struct sk_buff_head arrvq;
75 struct sk_buff_head inputq2;
76 struct sk_buff_head namedq;
77 };
78
79 /**
80 * struct tipc_node - TIPC node structure
81 * @addr: network address of node
82 * @ref: reference counter to node object
83 * @lock: rwlock governing access to structure
84 * @net: the applicable net namespace
85 * @hash: links to adjacent nodes in unsorted hash chain
86 * @inputq: pointer to input queue containing messages for msg event
87 * @namedq: pointer to name table input queue with name table messages
88 * @active_links: bearer ids of active links, used as index into links[] array
89 * @links: array containing references to all links to node
90 * @action_flags: bit mask of different types of node actions
91 * @state: connectivity state vs peer node
92 * @sync_point: sequence number where synch/failover is finished
93 * @list: links to adjacent nodes in sorted list of cluster's nodes
94 * @working_links: number of working links to node (both active and standby)
95 * @link_cnt: number of links to node
96 * @capabilities: bitmap, indicating peer node's functional capabilities
97 * @signature: node instance identifier
98 * @link_id: local and remote bearer ids of changing link, if any
99 * @publ_list: list of publications
100 * @rcu: rcu struct for tipc_node
101 * @delete_at: indicates the time for deleting a down node
102 */
103 struct tipc_node {
104 u32 addr;
105 struct kref kref;
106 rwlock_t lock;
107 struct net *net;
108 struct hlist_node hash;
109 int active_links[2];
110 struct tipc_link_entry links[MAX_BEARERS];
111 struct tipc_bclink_entry bc_entry;
112 int action_flags;
113 struct list_head list;
114 int state;
115 bool failover_sent;
116 u16 sync_point;
117 int link_cnt;
118 u16 working_links;
119 u16 capabilities;
120 u32 signature;
121 u32 link_id;
122 u8 peer_id[16];
123 struct list_head publ_list;
124 struct list_head conn_sks;
125 unsigned long keepalive_intv;
126 struct timer_list timer;
127 struct rcu_head rcu;
128 unsigned long delete_at;
129 };
130
131 /* Node FSM states and events:
132 */
133 enum {
134 SELF_DOWN_PEER_DOWN = 0xdd,
135 SELF_UP_PEER_UP = 0xaa,
136 SELF_DOWN_PEER_LEAVING = 0xd1,
137 SELF_UP_PEER_COMING = 0xac,
138 SELF_COMING_PEER_UP = 0xca,
139 SELF_LEAVING_PEER_DOWN = 0x1d,
140 NODE_FAILINGOVER = 0xf0,
141 NODE_SYNCHING = 0xcc
142 };
143
144 enum {
145 SELF_ESTABL_CONTACT_EVT = 0xece,
146 SELF_LOST_CONTACT_EVT = 0x1ce,
147 PEER_ESTABL_CONTACT_EVT = 0x9ece,
148 PEER_LOST_CONTACT_EVT = 0x91ce,
149 NODE_FAILOVER_BEGIN_EVT = 0xfbe,
150 NODE_FAILOVER_END_EVT = 0xfee,
151 NODE_SYNCH_BEGIN_EVT = 0xcbe,
152 NODE_SYNCH_END_EVT = 0xcee
153 };
154
155 static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
156 struct sk_buff_head *xmitq,
157 struct tipc_media_addr **maddr);
158 static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
159 bool delete);
160 static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
161 static void tipc_node_delete(struct tipc_node *node);
162 static void tipc_node_timeout(struct timer_list *t);
163 static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
164 static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
165 static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
166 static void tipc_node_put(struct tipc_node *node);
167 static bool node_is_up(struct tipc_node *n);
168 static void tipc_node_delete_from_list(struct tipc_node *node);
169
170 struct tipc_sock_conn {
171 u32 port;
172 u32 peer_port;
173 u32 peer_node;
174 struct list_head list;
175 };
176
177 static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
178 {
179 int bearer_id = n->active_links[sel & 1];
180
181 if (unlikely(bearer_id == INVALID_BEARER_ID))
182 return NULL;
183
184 return n->links[bearer_id].link;
185 }
186
187 int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel)
188 {
189 struct tipc_node *n;
190 int bearer_id;
191 unsigned int mtu = MAX_MSG_SIZE;
192
193 n = tipc_node_find(net, addr);
194 if (unlikely(!n))
195 return mtu;
196
197 bearer_id = n->active_links[sel & 1];
198 if (likely(bearer_id != INVALID_BEARER_ID))
199 mtu = n->links[bearer_id].mtu;
200 tipc_node_put(n);
201 return mtu;
202 }
203
204 bool tipc_node_get_id(struct net *net, u32 addr, u8 *id)
205 {
206 u8 *own_id = tipc_own_id(net);
207 struct tipc_node *n;
208
209 if (!own_id)
210 return true;
211
212 if (addr == tipc_own_addr(net)) {
213 memcpy(id, own_id, TIPC_NODEID_LEN);
214 return true;
215 }
216 n = tipc_node_find(net, addr);
217 if (!n)
218 return false;
219
220 memcpy(id, &n->peer_id, TIPC_NODEID_LEN);
221 tipc_node_put(n);
222 return true;
223 }
224
225 u16 tipc_node_get_capabilities(struct net *net, u32 addr)
226 {
227 struct tipc_node *n;
228 u16 caps;
229
230 n = tipc_node_find(net, addr);
231 if (unlikely(!n))
232 return TIPC_NODE_CAPABILITIES;
233 caps = n->capabilities;
234 tipc_node_put(n);
235 return caps;
236 }
237
238 static void tipc_node_kref_release(struct kref *kref)
239 {
240 struct tipc_node *n = container_of(kref, struct tipc_node, kref);
241
242 kfree(n->bc_entry.link);
243 kfree_rcu(n, rcu);
244 }
245
246 static void tipc_node_put(struct tipc_node *node)
247 {
248 kref_put(&node->kref, tipc_node_kref_release);
249 }
250
251 static void tipc_node_get(struct tipc_node *node)
252 {
253 kref_get(&node->kref);
254 }
255
256 /*
257 * tipc_node_find - locate specified node object, if it exists
258 */
259 static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
260 {
261 struct tipc_net *tn = tipc_net(net);
262 struct tipc_node *node;
263 unsigned int thash = tipc_hashfn(addr);
264
265 rcu_read_lock();
266 hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
267 if (node->addr != addr)
268 continue;
269 if (!kref_get_unless_zero(&node->kref))
270 node = NULL;
271 break;
272 }
273 rcu_read_unlock();
274 return node;
275 }
276
277 /* tipc_node_find_by_id - locate specified node object by its 128-bit id
278 * Note: this function is called only when a discovery request failed
279 * to find the node by its 32-bit id, and is not time critical
280 */
281 static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id)
282 {
283 struct tipc_net *tn = tipc_net(net);
284 struct tipc_node *n;
285 bool found = false;
286
287 rcu_read_lock();
288 list_for_each_entry_rcu(n, &tn->node_list, list) {
289 read_lock_bh(&n->lock);
290 if (!memcmp(id, n->peer_id, 16) &&
291 kref_get_unless_zero(&n->kref))
292 found = true;
293 read_unlock_bh(&n->lock);
294 if (found)
295 break;
296 }
297 rcu_read_unlock();
298 return found ? n : NULL;
299 }
300
301 static void tipc_node_read_lock(struct tipc_node *n)
302 {
303 read_lock_bh(&n->lock);
304 }
305
306 static void tipc_node_read_unlock(struct tipc_node *n)
307 {
308 read_unlock_bh(&n->lock);
309 }
310
311 static void tipc_node_write_lock(struct tipc_node *n)
312 {
313 write_lock_bh(&n->lock);
314 }
315
316 static void tipc_node_write_unlock_fast(struct tipc_node *n)
317 {
318 write_unlock_bh(&n->lock);
319 }
320
321 static void tipc_node_write_unlock(struct tipc_node *n)
322 {
323 struct net *net = n->net;
324 u32 addr = 0;
325 u32 flags = n->action_flags;
326 u32 link_id = 0;
327 u32 bearer_id;
328 struct list_head *publ_list;
329
330 if (likely(!flags)) {
331 write_unlock_bh(&n->lock);
332 return;
333 }
334
335 addr = n->addr;
336 link_id = n->link_id;
337 bearer_id = link_id & 0xffff;
338 publ_list = &n->publ_list;
339
340 n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
341 TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
342
343 write_unlock_bh(&n->lock);
344
345 if (flags & TIPC_NOTIFY_NODE_DOWN)
346 tipc_publ_notify(net, publ_list, addr);
347
348 if (flags & TIPC_NOTIFY_NODE_UP)
349 tipc_named_node_up(net, addr);
350
351 if (flags & TIPC_NOTIFY_LINK_UP) {
352 tipc_mon_peer_up(net, addr, bearer_id);
353 tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
354 TIPC_NODE_SCOPE, link_id, link_id);
355 }
356 if (flags & TIPC_NOTIFY_LINK_DOWN) {
357 tipc_mon_peer_down(net, addr, bearer_id);
358 tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
359 addr, link_id);
360 }
361 }
362
363 static struct tipc_node *tipc_node_create(struct net *net, u32 addr,
364 u8 *peer_id, u16 capabilities)
365 {
366 struct tipc_net *tn = net_generic(net, tipc_net_id);
367 struct tipc_node *n, *temp_node;
368 struct tipc_link *l;
369 int bearer_id;
370 int i;
371
372 spin_lock_bh(&tn->node_list_lock);
373 n = tipc_node_find(net, addr);
374 if (n) {
375 if (n->capabilities == capabilities)
376 goto exit;
377 /* Same node may come back with new capabilities */
378 tipc_node_write_lock(n);
379 n->capabilities = capabilities;
380 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
381 l = n->links[bearer_id].link;
382 if (l)
383 tipc_link_update_caps(l, capabilities);
384 }
385 tipc_node_write_unlock_fast(n);
386
387 /* Calculate cluster capabilities */
388 tn->capabilities = TIPC_NODE_CAPABILITIES;
389 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
390 tn->capabilities &= temp_node->capabilities;
391 }
392 goto exit;
393 }
394 n = kzalloc(sizeof(*n), GFP_ATOMIC);
395 if (!n) {
396 pr_warn("Node creation failed, no memory\n");
397 goto exit;
398 }
399 n->addr = addr;
400 memcpy(&n->peer_id, peer_id, 16);
401 n->net = net;
402 n->capabilities = capabilities;
403 kref_init(&n->kref);
404 rwlock_init(&n->lock);
405 INIT_HLIST_NODE(&n->hash);
406 INIT_LIST_HEAD(&n->list);
407 INIT_LIST_HEAD(&n->publ_list);
408 INIT_LIST_HEAD(&n->conn_sks);
409 skb_queue_head_init(&n->bc_entry.namedq);
410 skb_queue_head_init(&n->bc_entry.inputq1);
411 __skb_queue_head_init(&n->bc_entry.arrvq);
412 skb_queue_head_init(&n->bc_entry.inputq2);
413 for (i = 0; i < MAX_BEARERS; i++)
414 spin_lock_init(&n->links[i].lock);
415 n->state = SELF_DOWN_PEER_LEAVING;
416 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
417 n->signature = INVALID_NODE_SIG;
418 n->active_links[0] = INVALID_BEARER_ID;
419 n->active_links[1] = INVALID_BEARER_ID;
420 if (!tipc_link_bc_create(net, tipc_own_addr(net),
421 addr, U16_MAX,
422 tipc_link_window(tipc_bc_sndlink(net)),
423 n->capabilities,
424 &n->bc_entry.inputq1,
425 &n->bc_entry.namedq,
426 tipc_bc_sndlink(net),
427 &n->bc_entry.link)) {
428 pr_warn("Broadcast rcv link creation failed, no memory\n");
429 kfree(n);
430 n = NULL;
431 goto exit;
432 }
433 tipc_node_get(n);
434 timer_setup(&n->timer, tipc_node_timeout, 0);
435 n->keepalive_intv = U32_MAX;
436 hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
437 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
438 if (n->addr < temp_node->addr)
439 break;
440 }
441 list_add_tail_rcu(&n->list, &temp_node->list);
442 /* Calculate cluster capabilities */
443 tn->capabilities = TIPC_NODE_CAPABILITIES;
444 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
445 tn->capabilities &= temp_node->capabilities;
446 }
447 trace_tipc_node_create(n, true, " ");
448 exit:
449 spin_unlock_bh(&tn->node_list_lock);
450 return n;
451 }
452
453 static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
454 {
455 unsigned long tol = tipc_link_tolerance(l);
456 unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
457
458 /* Link with lowest tolerance determines timer interval */
459 if (intv < n->keepalive_intv)
460 n->keepalive_intv = intv;
461
462 /* Ensure link's abort limit corresponds to current tolerance */
463 tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
464 }
465
466 static void tipc_node_delete_from_list(struct tipc_node *node)
467 {
468 list_del_rcu(&node->list);
469 hlist_del_rcu(&node->hash);
470 tipc_node_put(node);
471 }
472
473 static void tipc_node_delete(struct tipc_node *node)
474 {
475 trace_tipc_node_delete(node, true, " ");
476 tipc_node_delete_from_list(node);
477
478 del_timer_sync(&node->timer);
479 tipc_node_put(node);
480 }
481
482 void tipc_node_stop(struct net *net)
483 {
484 struct tipc_net *tn = tipc_net(net);
485 struct tipc_node *node, *t_node;
486
487 spin_lock_bh(&tn->node_list_lock);
488 list_for_each_entry_safe(node, t_node, &tn->node_list, list)
489 tipc_node_delete(node);
490 spin_unlock_bh(&tn->node_list_lock);
491 }
492
493 void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
494 {
495 struct tipc_node *n;
496
497 if (in_own_node(net, addr))
498 return;
499
500 n = tipc_node_find(net, addr);
501 if (!n) {
502 pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
503 return;
504 }
505 tipc_node_write_lock(n);
506 list_add_tail(subscr, &n->publ_list);
507 tipc_node_write_unlock_fast(n);
508 tipc_node_put(n);
509 }
510
511 void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
512 {
513 struct tipc_node *n;
514
515 if (in_own_node(net, addr))
516 return;
517
518 n = tipc_node_find(net, addr);
519 if (!n) {
520 pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
521 return;
522 }
523 tipc_node_write_lock(n);
524 list_del_init(subscr);
525 tipc_node_write_unlock_fast(n);
526 tipc_node_put(n);
527 }
528
529 int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
530 {
531 struct tipc_node *node;
532 struct tipc_sock_conn *conn;
533 int err = 0;
534
535 if (in_own_node(net, dnode))
536 return 0;
537
538 node = tipc_node_find(net, dnode);
539 if (!node) {
540 pr_warn("Connecting sock to node 0x%x failed\n", dnode);
541 return -EHOSTUNREACH;
542 }
543 conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
544 if (!conn) {
545 err = -EHOSTUNREACH;
546 goto exit;
547 }
548 conn->peer_node = dnode;
549 conn->port = port;
550 conn->peer_port = peer_port;
551
552 tipc_node_write_lock(node);
553 list_add_tail(&conn->list, &node->conn_sks);
554 tipc_node_write_unlock(node);
555 exit:
556 tipc_node_put(node);
557 return err;
558 }
559
560 void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
561 {
562 struct tipc_node *node;
563 struct tipc_sock_conn *conn, *safe;
564
565 if (in_own_node(net, dnode))
566 return;
567
568 node = tipc_node_find(net, dnode);
569 if (!node)
570 return;
571
572 tipc_node_write_lock(node);
573 list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
574 if (port != conn->port)
575 continue;
576 list_del(&conn->list);
577 kfree(conn);
578 }
579 tipc_node_write_unlock(node);
580 tipc_node_put(node);
581 }
582
583 static void tipc_node_clear_links(struct tipc_node *node)
584 {
585 int i;
586
587 for (i = 0; i < MAX_BEARERS; i++) {
588 struct tipc_link_entry *le = &node->links[i];
589
590 if (le->link) {
591 kfree(le->link);
592 le->link = NULL;
593 node->link_cnt--;
594 }
595 }
596 }
597
598 /* tipc_node_cleanup - delete nodes that does not
599 * have active links for NODE_CLEANUP_AFTER time
600 */
601 static bool tipc_node_cleanup(struct tipc_node *peer)
602 {
603 struct tipc_node *temp_node;
604 struct tipc_net *tn = tipc_net(peer->net);
605 bool deleted = false;
606
607 /* If lock held by tipc_node_stop() the node will be deleted anyway */
608 if (!spin_trylock_bh(&tn->node_list_lock))
609 return false;
610
611 tipc_node_write_lock(peer);
612
613 if (!node_is_up(peer) && time_after(jiffies, peer->delete_at)) {
614 tipc_node_clear_links(peer);
615 tipc_node_delete_from_list(peer);
616 deleted = true;
617 }
618 tipc_node_write_unlock(peer);
619
620 /* Calculate cluster capabilities */
621 tn->capabilities = TIPC_NODE_CAPABILITIES;
622 list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
623 tn->capabilities &= temp_node->capabilities;
624 }
625
626 spin_unlock_bh(&tn->node_list_lock);
627 return deleted;
628 }
629
630 /* tipc_node_timeout - handle expiration of node timer
631 */
632 static void tipc_node_timeout(struct timer_list *t)
633 {
634 struct tipc_node *n = from_timer(n, t, timer);
635 struct tipc_link_entry *le;
636 struct sk_buff_head xmitq;
637 int remains = n->link_cnt;
638 int bearer_id;
639 int rc = 0;
640
641 trace_tipc_node_timeout(n, false, " ");
642 if (!node_is_up(n) && tipc_node_cleanup(n)) {
643 /*Removing the reference of Timer*/
644 tipc_node_put(n);
645 return;
646 }
647
648 __skb_queue_head_init(&xmitq);
649
650 /* Initial node interval to value larger (10 seconds), then it will be
651 * recalculated with link lowest tolerance
652 */
653 tipc_node_read_lock(n);
654 n->keepalive_intv = 10000;
655 tipc_node_read_unlock(n);
656 for (bearer_id = 0; remains && (bearer_id < MAX_BEARERS); bearer_id++) {
657 tipc_node_read_lock(n);
658 le = &n->links[bearer_id];
659 if (le->link) {
660 spin_lock_bh(&le->lock);
661 /* Link tolerance may change asynchronously: */
662 tipc_node_calculate_timer(n, le->link);
663 rc = tipc_link_timeout(le->link, &xmitq);
664 spin_unlock_bh(&le->lock);
665 remains--;
666 }
667 tipc_node_read_unlock(n);
668 tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
669 if (rc & TIPC_LINK_DOWN_EVT)
670 tipc_node_link_down(n, bearer_id, false);
671 }
672 mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
673 }
674
675 /**
676 * __tipc_node_link_up - handle addition of link
677 * Node lock must be held by caller
678 * Link becomes active (alone or shared) or standby, depending on its priority.
679 */
680 static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
681 struct sk_buff_head *xmitq)
682 {
683 int *slot0 = &n->active_links[0];
684 int *slot1 = &n->active_links[1];
685 struct tipc_link *ol = node_active_link(n, 0);
686 struct tipc_link *nl = n->links[bearer_id].link;
687
688 if (!nl || tipc_link_is_up(nl))
689 return;
690
691 tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
692 if (!tipc_link_is_up(nl))
693 return;
694
695 n->working_links++;
696 n->action_flags |= TIPC_NOTIFY_LINK_UP;
697 n->link_id = tipc_link_id(nl);
698
699 /* Leave room for tunnel header when returning 'mtu' to users: */
700 n->links[bearer_id].mtu = tipc_link_mtu(nl) - INT_H_SIZE;
701
702 tipc_bearer_add_dest(n->net, bearer_id, n->addr);
703 tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
704
705 pr_debug("Established link <%s> on network plane %c\n",
706 tipc_link_name(nl), tipc_link_plane(nl));
707 trace_tipc_node_link_up(n, true, " ");
708
709 /* Ensure that a STATE message goes first */
710 tipc_link_build_state_msg(nl, xmitq);
711
712 /* First link? => give it both slots */
713 if (!ol) {
714 *slot0 = bearer_id;
715 *slot1 = bearer_id;
716 tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
717 n->action_flags |= TIPC_NOTIFY_NODE_UP;
718 tipc_link_set_active(nl, true);
719 tipc_bcast_add_peer(n->net, nl, xmitq);
720 return;
721 }
722
723 /* Second link => redistribute slots */
724 if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
725 pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
726 *slot0 = bearer_id;
727 *slot1 = bearer_id;
728 tipc_link_set_active(nl, true);
729 tipc_link_set_active(ol, false);
730 } else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
731 tipc_link_set_active(nl, true);
732 *slot1 = bearer_id;
733 } else {
734 pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
735 }
736
737 /* Prepare synchronization with first link */
738 tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
739 }
740
741 /**
742 * tipc_node_link_up - handle addition of link
743 *
744 * Link becomes active (alone or shared) or standby, depending on its priority.
745 */
746 static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
747 struct sk_buff_head *xmitq)
748 {
749 struct tipc_media_addr *maddr;
750
751 tipc_node_write_lock(n);
752 __tipc_node_link_up(n, bearer_id, xmitq);
753 maddr = &n->links[bearer_id].maddr;
754 tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr);
755 tipc_node_write_unlock(n);
756 }
757
758 /**
759 * tipc_node_link_failover() - start failover in case "half-failover"
760 *
761 * This function is only called in a very special situation where link
762 * failover can be already started on peer node but not on this node.
763 * This can happen when e.g.
764 * 1. Both links <1A-2A>, <1B-2B> down
765 * 2. Link endpoint 2A up, but 1A still down (e.g. due to network
766 * disturbance, wrong session, etc.)
767 * 3. Link <1B-2B> up
768 * 4. Link endpoint 2A down (e.g. due to link tolerance timeout)
769 * 5. Node 2 starts failover onto link <1B-2B>
770 *
771 * ==> Node 1 does never start link/node failover!
772 *
773 * @n: tipc node structure
774 * @l: link peer endpoint failingover (- can be NULL)
775 * @tnl: tunnel link
776 * @xmitq: queue for messages to be xmited on tnl link later
777 */
778 static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,
779 struct tipc_link *tnl,
780 struct sk_buff_head *xmitq)
781 {
782 /* Avoid to be "self-failover" that can never end */
783 if (!tipc_link_is_up(tnl))
784 return;
785
786 /* Don't rush, failure link may be in the process of resetting */
787 if (l && !tipc_link_is_reset(l))
788 return;
789
790 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
791 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
792
793 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
794 tipc_link_failover_prepare(l, tnl, xmitq);
795
796 if (l)
797 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
798 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
799 }
800
801 /**
802 * __tipc_node_link_down - handle loss of link
803 */
804 static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
805 struct sk_buff_head *xmitq,
806 struct tipc_media_addr **maddr)
807 {
808 struct tipc_link_entry *le = &n->links[*bearer_id];
809 int *slot0 = &n->active_links[0];
810 int *slot1 = &n->active_links[1];
811 int i, highest = 0, prio;
812 struct tipc_link *l, *_l, *tnl;
813
814 l = n->links[*bearer_id].link;
815 if (!l || tipc_link_is_reset(l))
816 return;
817
818 n->working_links--;
819 n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
820 n->link_id = tipc_link_id(l);
821
822 tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
823
824 pr_debug("Lost link <%s> on network plane %c\n",
825 tipc_link_name(l), tipc_link_plane(l));
826
827 /* Select new active link if any available */
828 *slot0 = INVALID_BEARER_ID;
829 *slot1 = INVALID_BEARER_ID;
830 for (i = 0; i < MAX_BEARERS; i++) {
831 _l = n->links[i].link;
832 if (!_l || !tipc_link_is_up(_l))
833 continue;
834 if (_l == l)
835 continue;
836 prio = tipc_link_prio(_l);
837 if (prio < highest)
838 continue;
839 if (prio > highest) {
840 highest = prio;
841 *slot0 = i;
842 *slot1 = i;
843 continue;
844 }
845 *slot1 = i;
846 }
847
848 if (!node_is_up(n)) {
849 if (tipc_link_peer_is_down(l))
850 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
851 tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
852 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down!");
853 tipc_link_fsm_evt(l, LINK_RESET_EVT);
854 tipc_link_reset(l);
855 tipc_link_build_reset_msg(l, xmitq);
856 *maddr = &n->links[*bearer_id].maddr;
857 node_lost_contact(n, &le->inputq);
858 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
859 return;
860 }
861 tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
862
863 /* There is still a working link => initiate failover */
864 *bearer_id = n->active_links[0];
865 tnl = n->links[*bearer_id].link;
866 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
867 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
868 n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
869 tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
870 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link down -> failover!");
871 tipc_link_reset(l);
872 tipc_link_fsm_evt(l, LINK_RESET_EVT);
873 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
874 tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
875 *maddr = &n->links[*bearer_id].maddr;
876 }
877
878 static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
879 {
880 struct tipc_link_entry *le = &n->links[bearer_id];
881 struct tipc_media_addr *maddr = NULL;
882 struct tipc_link *l = le->link;
883 int old_bearer_id = bearer_id;
884 struct sk_buff_head xmitq;
885
886 if (!l)
887 return;
888
889 __skb_queue_head_init(&xmitq);
890
891 tipc_node_write_lock(n);
892 if (!tipc_link_is_establishing(l)) {
893 __tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
894 } else {
895 /* Defuse pending tipc_node_link_up() */
896 tipc_link_reset(l);
897 tipc_link_fsm_evt(l, LINK_RESET_EVT);
898 }
899 if (delete) {
900 kfree(l);
901 le->link = NULL;
902 n->link_cnt--;
903 }
904 trace_tipc_node_link_down(n, true, "node link down or deleted!");
905 tipc_node_write_unlock(n);
906 if (delete)
907 tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
908 if (!skb_queue_empty(&xmitq))
909 tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
910 tipc_sk_rcv(n->net, &le->inputq);
911 }
912
913 static bool node_is_up(struct tipc_node *n)
914 {
915 return n->active_links[0] != INVALID_BEARER_ID;
916 }
917
918 bool tipc_node_is_up(struct net *net, u32 addr)
919 {
920 struct tipc_node *n;
921 bool retval = false;
922
923 if (in_own_node(net, addr))
924 return true;
925
926 n = tipc_node_find(net, addr);
927 if (!n)
928 return false;
929 retval = node_is_up(n);
930 tipc_node_put(n);
931 return retval;
932 }
933
934 static u32 tipc_node_suggest_addr(struct net *net, u32 addr)
935 {
936 struct tipc_node *n;
937
938 addr ^= tipc_net(net)->random;
939 while ((n = tipc_node_find(net, addr))) {
940 tipc_node_put(n);
941 addr++;
942 }
943 return addr;
944 }
945
946 /* tipc_node_try_addr(): Check if addr can be used by peer, suggest other if not
947 * Returns suggested address if any, otherwise 0
948 */
949 u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr)
950 {
951 struct tipc_net *tn = tipc_net(net);
952 struct tipc_node *n;
953
954 /* Suggest new address if some other peer is using this one */
955 n = tipc_node_find(net, addr);
956 if (n) {
957 if (!memcmp(n->peer_id, id, NODE_ID_LEN))
958 addr = 0;
959 tipc_node_put(n);
960 if (!addr)
961 return 0;
962 return tipc_node_suggest_addr(net, addr);
963 }
964
965 /* Suggest previously used address if peer is known */
966 n = tipc_node_find_by_id(net, id);
967 if (n) {
968 addr = n->addr;
969 tipc_node_put(n);
970 return addr;
971 }
972
973 /* Even this node may be in conflict */
974 if (tn->trial_addr == addr)
975 return tipc_node_suggest_addr(net, addr);
976
977 return 0;
978 }
979
980 void tipc_node_check_dest(struct net *net, u32 addr,
981 u8 *peer_id, struct tipc_bearer *b,
982 u16 capabilities, u32 signature,
983 struct tipc_media_addr *maddr,
984 bool *respond, bool *dupl_addr)
985 {
986 struct tipc_node *n;
987 struct tipc_link *l;
988 struct tipc_link_entry *le;
989 bool addr_match = false;
990 bool sign_match = false;
991 bool link_up = false;
992 bool accept_addr = false;
993 bool reset = true;
994 char *if_name;
995 unsigned long intv;
996 u16 session;
997
998 *dupl_addr = false;
999 *respond = false;
1000
1001 n = tipc_node_create(net, addr, peer_id, capabilities);
1002 if (!n)
1003 return;
1004
1005 tipc_node_write_lock(n);
1006
1007 le = &n->links[b->identity];
1008
1009 /* Prepare to validate requesting node's signature and media address */
1010 l = le->link;
1011 link_up = l && tipc_link_is_up(l);
1012 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
1013 sign_match = (signature == n->signature);
1014
1015 /* These three flags give us eight permutations: */
1016
1017 if (sign_match && addr_match && link_up) {
1018 /* All is fine. Do nothing. */
1019 reset = false;
1020 } else if (sign_match && addr_match && !link_up) {
1021 /* Respond. The link will come up in due time */
1022 *respond = true;
1023 } else if (sign_match && !addr_match && link_up) {
1024 /* Peer has changed i/f address without rebooting.
1025 * If so, the link will reset soon, and the next
1026 * discovery will be accepted. So we can ignore it.
1027 * It may also be an cloned or malicious peer having
1028 * chosen the same node address and signature as an
1029 * existing one.
1030 * Ignore requests until the link goes down, if ever.
1031 */
1032 *dupl_addr = true;
1033 } else if (sign_match && !addr_match && !link_up) {
1034 /* Peer link has changed i/f address without rebooting.
1035 * It may also be a cloned or malicious peer; we can't
1036 * distinguish between the two.
1037 * The signature is correct, so we must accept.
1038 */
1039 accept_addr = true;
1040 *respond = true;
1041 } else if (!sign_match && addr_match && link_up) {
1042 /* Peer node rebooted. Two possibilities:
1043 * - Delayed re-discovery; this link endpoint has already
1044 * reset and re-established contact with the peer, before
1045 * receiving a discovery message from that node.
1046 * (The peer happened to receive one from this node first).
1047 * - The peer came back so fast that our side has not
1048 * discovered it yet. Probing from this side will soon
1049 * reset the link, since there can be no working link
1050 * endpoint at the peer end, and the link will re-establish.
1051 * Accept the signature, since it comes from a known peer.
1052 */
1053 n->signature = signature;
1054 } else if (!sign_match && addr_match && !link_up) {
1055 /* The peer node has rebooted.
1056 * Accept signature, since it is a known peer.
1057 */
1058 n->signature = signature;
1059 *respond = true;
1060 } else if (!sign_match && !addr_match && link_up) {
1061 /* Peer rebooted with new address, or a new/duplicate peer.
1062 * Ignore until the link goes down, if ever.
1063 */
1064 *dupl_addr = true;
1065 } else if (!sign_match && !addr_match && !link_up) {
1066 /* Peer rebooted with new address, or it is a new peer.
1067 * Accept signature and address.
1068 */
1069 n->signature = signature;
1070 accept_addr = true;
1071 *respond = true;
1072 }
1073
1074 if (!accept_addr)
1075 goto exit;
1076
1077 /* Now create new link if not already existing */
1078 if (!l) {
1079 if (n->link_cnt == 2)
1080 goto exit;
1081
1082 if_name = strchr(b->name, ':') + 1;
1083 get_random_bytes(&session, sizeof(u16));
1084 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
1085 b->net_plane, b->mtu, b->priority,
1086 b->window, session,
1087 tipc_own_addr(net), addr, peer_id,
1088 n->capabilities,
1089 tipc_bc_sndlink(n->net), n->bc_entry.link,
1090 &le->inputq,
1091 &n->bc_entry.namedq, &l)) {
1092 *respond = false;
1093 goto exit;
1094 }
1095 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "link created!");
1096 tipc_link_reset(l);
1097 tipc_link_fsm_evt(l, LINK_RESET_EVT);
1098 if (n->state == NODE_FAILINGOVER)
1099 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
1100 le->link = l;
1101 n->link_cnt++;
1102 tipc_node_calculate_timer(n, l);
1103 if (n->link_cnt == 1) {
1104 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
1105 if (!mod_timer(&n->timer, intv))
1106 tipc_node_get(n);
1107 }
1108 }
1109 memcpy(&le->maddr, maddr, sizeof(*maddr));
1110 exit:
1111 tipc_node_write_unlock(n);
1112 if (reset && l && !tipc_link_is_reset(l))
1113 tipc_node_link_down(n, b->identity, false);
1114 tipc_node_put(n);
1115 }
1116
1117 void tipc_node_delete_links(struct net *net, int bearer_id)
1118 {
1119 struct tipc_net *tn = net_generic(net, tipc_net_id);
1120 struct tipc_node *n;
1121
1122 rcu_read_lock();
1123 list_for_each_entry_rcu(n, &tn->node_list, list) {
1124 tipc_node_link_down(n, bearer_id, true);
1125 }
1126 rcu_read_unlock();
1127 }
1128
1129 static void tipc_node_reset_links(struct tipc_node *n)
1130 {
1131 int i;
1132
1133 pr_warn("Resetting all links to %x\n", n->addr);
1134
1135 trace_tipc_node_reset_links(n, true, " ");
1136 for (i = 0; i < MAX_BEARERS; i++) {
1137 tipc_node_link_down(n, i, false);
1138 }
1139 }
1140
1141 /* tipc_node_fsm_evt - node finite state machine
1142 * Determines when contact is allowed with peer node
1143 */
1144 static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
1145 {
1146 int state = n->state;
1147
1148 switch (state) {
1149 case SELF_DOWN_PEER_DOWN:
1150 switch (evt) {
1151 case SELF_ESTABL_CONTACT_EVT:
1152 state = SELF_UP_PEER_COMING;
1153 break;
1154 case PEER_ESTABL_CONTACT_EVT:
1155 state = SELF_COMING_PEER_UP;
1156 break;
1157 case SELF_LOST_CONTACT_EVT:
1158 case PEER_LOST_CONTACT_EVT:
1159 break;
1160 case NODE_SYNCH_END_EVT:
1161 case NODE_SYNCH_BEGIN_EVT:
1162 case NODE_FAILOVER_BEGIN_EVT:
1163 case NODE_FAILOVER_END_EVT:
1164 default:
1165 goto illegal_evt;
1166 }
1167 break;
1168 case SELF_UP_PEER_UP:
1169 switch (evt) {
1170 case SELF_LOST_CONTACT_EVT:
1171 state = SELF_DOWN_PEER_LEAVING;
1172 break;
1173 case PEER_LOST_CONTACT_EVT:
1174 state = SELF_LEAVING_PEER_DOWN;
1175 break;
1176 case NODE_SYNCH_BEGIN_EVT:
1177 state = NODE_SYNCHING;
1178 break;
1179 case NODE_FAILOVER_BEGIN_EVT:
1180 state = NODE_FAILINGOVER;
1181 break;
1182 case SELF_ESTABL_CONTACT_EVT:
1183 case PEER_ESTABL_CONTACT_EVT:
1184 case NODE_SYNCH_END_EVT:
1185 case NODE_FAILOVER_END_EVT:
1186 break;
1187 default:
1188 goto illegal_evt;
1189 }
1190 break;
1191 case SELF_DOWN_PEER_LEAVING:
1192 switch (evt) {
1193 case PEER_LOST_CONTACT_EVT:
1194 state = SELF_DOWN_PEER_DOWN;
1195 break;
1196 case SELF_ESTABL_CONTACT_EVT:
1197 case PEER_ESTABL_CONTACT_EVT:
1198 case SELF_LOST_CONTACT_EVT:
1199 break;
1200 case NODE_SYNCH_END_EVT:
1201 case NODE_SYNCH_BEGIN_EVT:
1202 case NODE_FAILOVER_BEGIN_EVT:
1203 case NODE_FAILOVER_END_EVT:
1204 default:
1205 goto illegal_evt;
1206 }
1207 break;
1208 case SELF_UP_PEER_COMING:
1209 switch (evt) {
1210 case PEER_ESTABL_CONTACT_EVT:
1211 state = SELF_UP_PEER_UP;
1212 break;
1213 case SELF_LOST_CONTACT_EVT:
1214 state = SELF_DOWN_PEER_DOWN;
1215 break;
1216 case SELF_ESTABL_CONTACT_EVT:
1217 case PEER_LOST_CONTACT_EVT:
1218 case NODE_SYNCH_END_EVT:
1219 case NODE_FAILOVER_BEGIN_EVT:
1220 break;
1221 case NODE_SYNCH_BEGIN_EVT:
1222 case NODE_FAILOVER_END_EVT:
1223 default:
1224 goto illegal_evt;
1225 }
1226 break;
1227 case SELF_COMING_PEER_UP:
1228 switch (evt) {
1229 case SELF_ESTABL_CONTACT_EVT:
1230 state = SELF_UP_PEER_UP;
1231 break;
1232 case PEER_LOST_CONTACT_EVT:
1233 state = SELF_DOWN_PEER_DOWN;
1234 break;
1235 case SELF_LOST_CONTACT_EVT:
1236 case PEER_ESTABL_CONTACT_EVT:
1237 break;
1238 case NODE_SYNCH_END_EVT:
1239 case NODE_SYNCH_BEGIN_EVT:
1240 case NODE_FAILOVER_BEGIN_EVT:
1241 case NODE_FAILOVER_END_EVT:
1242 default:
1243 goto illegal_evt;
1244 }
1245 break;
1246 case SELF_LEAVING_PEER_DOWN:
1247 switch (evt) {
1248 case SELF_LOST_CONTACT_EVT:
1249 state = SELF_DOWN_PEER_DOWN;
1250 break;
1251 case SELF_ESTABL_CONTACT_EVT:
1252 case PEER_ESTABL_CONTACT_EVT:
1253 case PEER_LOST_CONTACT_EVT:
1254 break;
1255 case NODE_SYNCH_END_EVT:
1256 case NODE_SYNCH_BEGIN_EVT:
1257 case NODE_FAILOVER_BEGIN_EVT:
1258 case NODE_FAILOVER_END_EVT:
1259 default:
1260 goto illegal_evt;
1261 }
1262 break;
1263 case NODE_FAILINGOVER:
1264 switch (evt) {
1265 case SELF_LOST_CONTACT_EVT:
1266 state = SELF_DOWN_PEER_LEAVING;
1267 break;
1268 case PEER_LOST_CONTACT_EVT:
1269 state = SELF_LEAVING_PEER_DOWN;
1270 break;
1271 case NODE_FAILOVER_END_EVT:
1272 state = SELF_UP_PEER_UP;
1273 break;
1274 case NODE_FAILOVER_BEGIN_EVT:
1275 case SELF_ESTABL_CONTACT_EVT:
1276 case PEER_ESTABL_CONTACT_EVT:
1277 break;
1278 case NODE_SYNCH_BEGIN_EVT:
1279 case NODE_SYNCH_END_EVT:
1280 default:
1281 goto illegal_evt;
1282 }
1283 break;
1284 case NODE_SYNCHING:
1285 switch (evt) {
1286 case SELF_LOST_CONTACT_EVT:
1287 state = SELF_DOWN_PEER_LEAVING;
1288 break;
1289 case PEER_LOST_CONTACT_EVT:
1290 state = SELF_LEAVING_PEER_DOWN;
1291 break;
1292 case NODE_SYNCH_END_EVT:
1293 state = SELF_UP_PEER_UP;
1294 break;
1295 case NODE_FAILOVER_BEGIN_EVT:
1296 state = NODE_FAILINGOVER;
1297 break;
1298 case NODE_SYNCH_BEGIN_EVT:
1299 case SELF_ESTABL_CONTACT_EVT:
1300 case PEER_ESTABL_CONTACT_EVT:
1301 break;
1302 case NODE_FAILOVER_END_EVT:
1303 default:
1304 goto illegal_evt;
1305 }
1306 break;
1307 default:
1308 pr_err("Unknown node fsm state %x\n", state);
1309 break;
1310 }
1311 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1312 n->state = state;
1313 return;
1314
1315 illegal_evt:
1316 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1317 trace_tipc_node_fsm(n->peer_id, n->state, state, evt);
1318 }
1319
1320 static void node_lost_contact(struct tipc_node *n,
1321 struct sk_buff_head *inputq)
1322 {
1323 struct tipc_sock_conn *conn, *safe;
1324 struct tipc_link *l;
1325 struct list_head *conns = &n->conn_sks;
1326 struct sk_buff *skb;
1327 uint i;
1328
1329 pr_debug("Lost contact with %x\n", n->addr);
1330 n->delete_at = jiffies + msecs_to_jiffies(NODE_CLEANUP_AFTER);
1331 trace_tipc_node_lost_contact(n, true, " ");
1332
1333 /* Clean up broadcast state */
1334 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1335
1336 /* Abort any ongoing link failover */
1337 for (i = 0; i < MAX_BEARERS; i++) {
1338 l = n->links[i].link;
1339 if (l)
1340 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1341 }
1342
1343 /* Notify publications from this node */
1344 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1345
1346 /* Notify sockets connected to node */
1347 list_for_each_entry_safe(conn, safe, conns, list) {
1348 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1349 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1350 conn->peer_node, conn->port,
1351 conn->peer_port, TIPC_ERR_NO_NODE);
1352 if (likely(skb))
1353 skb_queue_tail(inputq, skb);
1354 list_del(&conn->list);
1355 kfree(conn);
1356 }
1357 }
1358
1359 /**
1360 * tipc_node_get_linkname - get the name of a link
1361 *
1362 * @bearer_id: id of the bearer
1363 * @node: peer node address
1364 * @linkname: link name output buffer
1365 *
1366 * Returns 0 on success
1367 */
1368 int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1369 char *linkname, size_t len)
1370 {
1371 struct tipc_link *link;
1372 int err = -EINVAL;
1373 struct tipc_node *node = tipc_node_find(net, addr);
1374
1375 if (!node)
1376 return err;
1377
1378 if (bearer_id >= MAX_BEARERS)
1379 goto exit;
1380
1381 tipc_node_read_lock(node);
1382 link = node->links[bearer_id].link;
1383 if (link) {
1384 strncpy(linkname, tipc_link_name(link), len);
1385 err = 0;
1386 }
1387 tipc_node_read_unlock(node);
1388 exit:
1389 tipc_node_put(node);
1390 return err;
1391 }
1392
1393 /* Caller should hold node lock for the passed node */
1394 static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1395 {
1396 void *hdr;
1397 struct nlattr *attrs;
1398
1399 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1400 NLM_F_MULTI, TIPC_NL_NODE_GET);
1401 if (!hdr)
1402 return -EMSGSIZE;
1403
1404 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NODE);
1405 if (!attrs)
1406 goto msg_full;
1407
1408 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1409 goto attr_msg_full;
1410 if (node_is_up(node))
1411 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1412 goto attr_msg_full;
1413
1414 nla_nest_end(msg->skb, attrs);
1415 genlmsg_end(msg->skb, hdr);
1416
1417 return 0;
1418
1419 attr_msg_full:
1420 nla_nest_cancel(msg->skb, attrs);
1421 msg_full:
1422 genlmsg_cancel(msg->skb, hdr);
1423
1424 return -EMSGSIZE;
1425 }
1426
1427 /**
1428 * tipc_node_xmit() is the general link level function for message sending
1429 * @net: the applicable net namespace
1430 * @list: chain of buffers containing message
1431 * @dnode: address of destination node
1432 * @selector: a number used for deterministic link selection
1433 * Consumes the buffer chain.
1434 * Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1435 */
1436 int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1437 u32 dnode, int selector)
1438 {
1439 struct tipc_link_entry *le = NULL;
1440 struct tipc_node *n;
1441 struct sk_buff_head xmitq;
1442 int bearer_id;
1443 int rc;
1444
1445 if (in_own_node(net, dnode)) {
1446 tipc_sk_rcv(net, list);
1447 return 0;
1448 }
1449
1450 n = tipc_node_find(net, dnode);
1451 if (unlikely(!n)) {
1452 skb_queue_purge(list);
1453 return -EHOSTUNREACH;
1454 }
1455
1456 tipc_node_read_lock(n);
1457 bearer_id = n->active_links[selector & 1];
1458 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1459 tipc_node_read_unlock(n);
1460 tipc_node_put(n);
1461 skb_queue_purge(list);
1462 return -EHOSTUNREACH;
1463 }
1464
1465 __skb_queue_head_init(&xmitq);
1466 le = &n->links[bearer_id];
1467 spin_lock_bh(&le->lock);
1468 rc = tipc_link_xmit(le->link, list, &xmitq);
1469 spin_unlock_bh(&le->lock);
1470 tipc_node_read_unlock(n);
1471
1472 if (unlikely(rc == -ENOBUFS))
1473 tipc_node_link_down(n, bearer_id, false);
1474 else
1475 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1476
1477 tipc_node_put(n);
1478
1479 return rc;
1480 }
1481
1482 /* tipc_node_xmit_skb(): send single buffer to destination
1483 * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
1484 * messages, which will not be rejected
1485 * The only exception is datagram messages rerouted after secondary
1486 * lookup, which are rare and safe to dispose of anyway.
1487 */
1488 int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1489 u32 selector)
1490 {
1491 struct sk_buff_head head;
1492
1493 skb_queue_head_init(&head);
1494 __skb_queue_tail(&head, skb);
1495 tipc_node_xmit(net, &head, dnode, selector);
1496 return 0;
1497 }
1498
1499 /* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1500 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1501 */
1502 int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1503 {
1504 struct sk_buff *skb;
1505 u32 selector, dnode;
1506
1507 while ((skb = __skb_dequeue(xmitq))) {
1508 selector = msg_origport(buf_msg(skb));
1509 dnode = msg_destnode(buf_msg(skb));
1510 tipc_node_xmit_skb(net, skb, dnode, selector);
1511 }
1512 return 0;
1513 }
1514
1515 void tipc_node_broadcast(struct net *net, struct sk_buff *skb)
1516 {
1517 struct sk_buff *txskb;
1518 struct tipc_node *n;
1519 u32 dst;
1520
1521 rcu_read_lock();
1522 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1523 dst = n->addr;
1524 if (in_own_node(net, dst))
1525 continue;
1526 if (!node_is_up(n))
1527 continue;
1528 txskb = pskb_copy(skb, GFP_ATOMIC);
1529 if (!txskb)
1530 break;
1531 msg_set_destnode(buf_msg(txskb), dst);
1532 tipc_node_xmit_skb(net, txskb, dst, 0);
1533 }
1534 rcu_read_unlock();
1535
1536 kfree_skb(skb);
1537 }
1538
1539 static void tipc_node_mcast_rcv(struct tipc_node *n)
1540 {
1541 struct tipc_bclink_entry *be = &n->bc_entry;
1542
1543 /* 'arrvq' is under inputq2's lock protection */
1544 spin_lock_bh(&be->inputq2.lock);
1545 spin_lock_bh(&be->inputq1.lock);
1546 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1547 spin_unlock_bh(&be->inputq1.lock);
1548 spin_unlock_bh(&be->inputq2.lock);
1549 tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1550 }
1551
1552 static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1553 int bearer_id, struct sk_buff_head *xmitq)
1554 {
1555 struct tipc_link *ucl;
1556 int rc;
1557
1558 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr);
1559
1560 if (rc & TIPC_LINK_DOWN_EVT) {
1561 tipc_node_reset_links(n);
1562 return;
1563 }
1564
1565 if (!(rc & TIPC_LINK_SND_STATE))
1566 return;
1567
1568 /* If probe message, a STATE response will be sent anyway */
1569 if (msg_probe(hdr))
1570 return;
1571
1572 /* Produce a STATE message carrying broadcast NACK */
1573 tipc_node_read_lock(n);
1574 ucl = n->links[bearer_id].link;
1575 if (ucl)
1576 tipc_link_build_state_msg(ucl, xmitq);
1577 tipc_node_read_unlock(n);
1578 }
1579
1580 /**
1581 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1582 * @net: the applicable net namespace
1583 * @skb: TIPC packet
1584 * @bearer_id: id of bearer message arrived on
1585 *
1586 * Invoked with no locks held.
1587 */
1588 static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1589 {
1590 int rc;
1591 struct sk_buff_head xmitq;
1592 struct tipc_bclink_entry *be;
1593 struct tipc_link_entry *le;
1594 struct tipc_msg *hdr = buf_msg(skb);
1595 int usr = msg_user(hdr);
1596 u32 dnode = msg_destnode(hdr);
1597 struct tipc_node *n;
1598
1599 __skb_queue_head_init(&xmitq);
1600
1601 /* If NACK for other node, let rcv link for that node peek into it */
1602 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1603 n = tipc_node_find(net, dnode);
1604 else
1605 n = tipc_node_find(net, msg_prevnode(hdr));
1606 if (!n) {
1607 kfree_skb(skb);
1608 return;
1609 }
1610 be = &n->bc_entry;
1611 le = &n->links[bearer_id];
1612
1613 rc = tipc_bcast_rcv(net, be->link, skb);
1614
1615 /* Broadcast ACKs are sent on a unicast link */
1616 if (rc & TIPC_LINK_SND_STATE) {
1617 tipc_node_read_lock(n);
1618 tipc_link_build_state_msg(le->link, &xmitq);
1619 tipc_node_read_unlock(n);
1620 }
1621
1622 if (!skb_queue_empty(&xmitq))
1623 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1624
1625 if (!skb_queue_empty(&be->inputq1))
1626 tipc_node_mcast_rcv(n);
1627
1628 /* Handle NAME_DISTRIBUTOR messages sent from 1.7 nodes */
1629 if (!skb_queue_empty(&n->bc_entry.namedq))
1630 tipc_named_rcv(net, &n->bc_entry.namedq);
1631
1632 /* If reassembly or retransmission failure => reset all links to peer */
1633 if (rc & TIPC_LINK_DOWN_EVT)
1634 tipc_node_reset_links(n);
1635
1636 tipc_node_put(n);
1637 }
1638
1639 /**
1640 * tipc_node_check_state - check and if necessary update node state
1641 * @skb: TIPC packet
1642 * @bearer_id: identity of bearer delivering the packet
1643 * Returns true if state and msg are ok, otherwise false
1644 */
1645 static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1646 int bearer_id, struct sk_buff_head *xmitq)
1647 {
1648 struct tipc_msg *hdr = buf_msg(skb);
1649 int usr = msg_user(hdr);
1650 int mtyp = msg_type(hdr);
1651 u16 oseqno = msg_seqno(hdr);
1652 u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
1653 u16 exp_pkts = msg_msgcnt(hdr);
1654 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1655 int state = n->state;
1656 struct tipc_link *l, *tnl, *pl = NULL;
1657 struct tipc_media_addr *maddr;
1658 int pb_id;
1659
1660 if (trace_tipc_node_check_state_enabled()) {
1661 trace_tipc_skb_dump(skb, false, "skb for node state check");
1662 trace_tipc_node_check_state(n, true, " ");
1663 }
1664 l = n->links[bearer_id].link;
1665 if (!l)
1666 return false;
1667 rcv_nxt = tipc_link_rcv_nxt(l);
1668
1669
1670 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1671 return true;
1672
1673 /* Find parallel link, if any */
1674 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1675 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1676 pl = n->links[pb_id].link;
1677 break;
1678 }
1679 }
1680
1681 if (!tipc_link_validate_msg(l, hdr)) {
1682 trace_tipc_skb_dump(skb, false, "PROTO invalid (2)!");
1683 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (2)!");
1684 return false;
1685 }
1686
1687 /* Check and update node accesibility if applicable */
1688 if (state == SELF_UP_PEER_COMING) {
1689 if (!tipc_link_is_up(l))
1690 return true;
1691 if (!msg_peer_link_is_up(hdr))
1692 return true;
1693 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1694 }
1695
1696 if (state == SELF_DOWN_PEER_LEAVING) {
1697 if (msg_peer_node_is_up(hdr))
1698 return false;
1699 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1700 return true;
1701 }
1702
1703 if (state == SELF_LEAVING_PEER_DOWN)
1704 return false;
1705
1706 /* Ignore duplicate packets */
1707 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1708 return true;
1709
1710 /* Initiate or update failover mode if applicable */
1711 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1712 syncpt = oseqno + exp_pkts - 1;
1713 if (pl && !tipc_link_is_reset(pl)) {
1714 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1715 trace_tipc_node_link_down(n, true,
1716 "node link down <- failover!");
1717 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
1718 tipc_link_inputq(l));
1719 }
1720
1721 /* If parallel link was already down, and this happened before
1722 * the tunnel link came up, node failover was never started.
1723 * Ensure that a FAILOVER_MSG is sent to get peer out of
1724 * NODE_FAILINGOVER state, also this node must accept
1725 * TUNNEL_MSGs from peer.
1726 */
1727 if (n->state != NODE_FAILINGOVER)
1728 tipc_node_link_failover(n, pl, l, xmitq);
1729
1730 /* If pkts arrive out of order, use lowest calculated syncpt */
1731 if (less(syncpt, n->sync_point))
1732 n->sync_point = syncpt;
1733 }
1734
1735 /* Open parallel link when tunnel link reaches synch point */
1736 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
1737 if (!more(rcv_nxt, n->sync_point))
1738 return true;
1739 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
1740 if (pl)
1741 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
1742 return true;
1743 }
1744
1745 /* No synching needed if only one link */
1746 if (!pl || !tipc_link_is_up(pl))
1747 return true;
1748
1749 /* Initiate synch mode if applicable */
1750 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
1751 syncpt = iseqno + exp_pkts - 1;
1752 if (!tipc_link_is_up(l))
1753 __tipc_node_link_up(n, bearer_id, xmitq);
1754 if (n->state == SELF_UP_PEER_UP) {
1755 n->sync_point = syncpt;
1756 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
1757 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
1758 }
1759 }
1760
1761 /* Open tunnel link when parallel link reaches synch point */
1762 if (n->state == NODE_SYNCHING) {
1763 if (tipc_link_is_synching(l)) {
1764 tnl = l;
1765 } else {
1766 tnl = pl;
1767 pl = l;
1768 }
1769 inputq_len = skb_queue_len(tipc_link_inputq(pl));
1770 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
1771 if (more(dlv_nxt, n->sync_point)) {
1772 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1773 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1774 return true;
1775 }
1776 if (l == pl)
1777 return true;
1778 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
1779 return true;
1780 if (usr == LINK_PROTOCOL)
1781 return true;
1782 return false;
1783 }
1784 return true;
1785 }
1786
1787 /**
1788 * tipc_rcv - process TIPC packets/messages arriving from off-node
1789 * @net: the applicable net namespace
1790 * @skb: TIPC packet
1791 * @bearer: pointer to bearer message arrived on
1792 *
1793 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1794 * structure (i.e. cannot be NULL), but bearer can be inactive.
1795 */
1796 void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
1797 {
1798 struct sk_buff_head xmitq;
1799 struct tipc_node *n;
1800 struct tipc_msg *hdr;
1801 int bearer_id = b->identity;
1802 struct tipc_link_entry *le;
1803 u32 self = tipc_own_addr(net);
1804 int usr, rc = 0;
1805 u16 bc_ack;
1806
1807 __skb_queue_head_init(&xmitq);
1808
1809 /* Ensure message is well-formed before touching the header */
1810 if (unlikely(!tipc_msg_validate(&skb)))
1811 goto discard;
1812 hdr = buf_msg(skb);
1813 usr = msg_user(hdr);
1814 bc_ack = msg_bcast_ack(hdr);
1815
1816 /* Handle arrival of discovery or broadcast packet */
1817 if (unlikely(msg_non_seq(hdr))) {
1818 if (unlikely(usr == LINK_CONFIG))
1819 return tipc_disc_rcv(net, skb, b);
1820 else
1821 return tipc_node_bc_rcv(net, skb, bearer_id);
1822 }
1823
1824 /* Discard unicast link messages destined for another node */
1825 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
1826 goto discard;
1827
1828 /* Locate neighboring node that sent packet */
1829 n = tipc_node_find(net, msg_prevnode(hdr));
1830 if (unlikely(!n))
1831 goto discard;
1832 le = &n->links[bearer_id];
1833
1834 /* Ensure broadcast reception is in synch with peer's send state */
1835 if (unlikely(usr == LINK_PROTOCOL))
1836 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
1837 else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack))
1838 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
1839
1840 /* Receive packet directly if conditions permit */
1841 tipc_node_read_lock(n);
1842 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
1843 spin_lock_bh(&le->lock);
1844 if (le->link) {
1845 rc = tipc_link_rcv(le->link, skb, &xmitq);
1846 skb = NULL;
1847 }
1848 spin_unlock_bh(&le->lock);
1849 }
1850 tipc_node_read_unlock(n);
1851
1852 /* Check/update node state before receiving */
1853 if (unlikely(skb)) {
1854 if (unlikely(skb_linearize(skb)))
1855 goto discard;
1856 tipc_node_write_lock(n);
1857 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
1858 if (le->link) {
1859 rc = tipc_link_rcv(le->link, skb, &xmitq);
1860 skb = NULL;
1861 }
1862 }
1863 tipc_node_write_unlock(n);
1864 }
1865
1866 if (unlikely(rc & TIPC_LINK_UP_EVT))
1867 tipc_node_link_up(n, bearer_id, &xmitq);
1868
1869 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
1870 tipc_node_link_down(n, bearer_id, false);
1871
1872 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
1873 tipc_named_rcv(net, &n->bc_entry.namedq);
1874
1875 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
1876 tipc_node_mcast_rcv(n);
1877
1878 if (!skb_queue_empty(&le->inputq))
1879 tipc_sk_rcv(net, &le->inputq);
1880
1881 if (!skb_queue_empty(&xmitq))
1882 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1883
1884 tipc_node_put(n);
1885 discard:
1886 kfree_skb(skb);
1887 }
1888
1889 void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
1890 int prop)
1891 {
1892 struct tipc_net *tn = tipc_net(net);
1893 int bearer_id = b->identity;
1894 struct sk_buff_head xmitq;
1895 struct tipc_link_entry *e;
1896 struct tipc_node *n;
1897
1898 __skb_queue_head_init(&xmitq);
1899
1900 rcu_read_lock();
1901
1902 list_for_each_entry_rcu(n, &tn->node_list, list) {
1903 tipc_node_write_lock(n);
1904 e = &n->links[bearer_id];
1905 if (e->link) {
1906 if (prop == TIPC_NLA_PROP_TOL)
1907 tipc_link_set_tolerance(e->link, b->tolerance,
1908 &xmitq);
1909 else if (prop == TIPC_NLA_PROP_MTU)
1910 tipc_link_set_mtu(e->link, b->mtu);
1911 }
1912 tipc_node_write_unlock(n);
1913 tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr);
1914 }
1915
1916 rcu_read_unlock();
1917 }
1918
1919 int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
1920 {
1921 struct net *net = sock_net(skb->sk);
1922 struct tipc_net *tn = net_generic(net, tipc_net_id);
1923 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
1924 struct tipc_node *peer;
1925 u32 addr;
1926 int err;
1927
1928 /* We identify the peer by its net */
1929 if (!info->attrs[TIPC_NLA_NET])
1930 return -EINVAL;
1931
1932 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
1933 info->attrs[TIPC_NLA_NET],
1934 tipc_nl_net_policy, info->extack);
1935 if (err)
1936 return err;
1937
1938 if (!attrs[TIPC_NLA_NET_ADDR])
1939 return -EINVAL;
1940
1941 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
1942
1943 if (in_own_node(net, addr))
1944 return -ENOTSUPP;
1945
1946 spin_lock_bh(&tn->node_list_lock);
1947 peer = tipc_node_find(net, addr);
1948 if (!peer) {
1949 spin_unlock_bh(&tn->node_list_lock);
1950 return -ENXIO;
1951 }
1952
1953 tipc_node_write_lock(peer);
1954 if (peer->state != SELF_DOWN_PEER_DOWN &&
1955 peer->state != SELF_DOWN_PEER_LEAVING) {
1956 tipc_node_write_unlock(peer);
1957 err = -EBUSY;
1958 goto err_out;
1959 }
1960
1961 tipc_node_clear_links(peer);
1962 tipc_node_write_unlock(peer);
1963 tipc_node_delete(peer);
1964
1965 err = 0;
1966 err_out:
1967 tipc_node_put(peer);
1968 spin_unlock_bh(&tn->node_list_lock);
1969
1970 return err;
1971 }
1972
1973 int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
1974 {
1975 int err;
1976 struct net *net = sock_net(skb->sk);
1977 struct tipc_net *tn = net_generic(net, tipc_net_id);
1978 int done = cb->args[0];
1979 int last_addr = cb->args[1];
1980 struct tipc_node *node;
1981 struct tipc_nl_msg msg;
1982
1983 if (done)
1984 return 0;
1985
1986 msg.skb = skb;
1987 msg.portid = NETLINK_CB(cb->skb).portid;
1988 msg.seq = cb->nlh->nlmsg_seq;
1989
1990 rcu_read_lock();
1991 if (last_addr) {
1992 node = tipc_node_find(net, last_addr);
1993 if (!node) {
1994 rcu_read_unlock();
1995 /* We never set seq or call nl_dump_check_consistent()
1996 * this means that setting prev_seq here will cause the
1997 * consistence check to fail in the netlink callback
1998 * handler. Resulting in the NLMSG_DONE message having
1999 * the NLM_F_DUMP_INTR flag set if the node state
2000 * changed while we released the lock.
2001 */
2002 cb->prev_seq = 1;
2003 return -EPIPE;
2004 }
2005 tipc_node_put(node);
2006 }
2007
2008 list_for_each_entry_rcu(node, &tn->node_list, list) {
2009 if (last_addr) {
2010 if (node->addr == last_addr)
2011 last_addr = 0;
2012 else
2013 continue;
2014 }
2015
2016 tipc_node_read_lock(node);
2017 err = __tipc_nl_add_node(&msg, node);
2018 if (err) {
2019 last_addr = node->addr;
2020 tipc_node_read_unlock(node);
2021 goto out;
2022 }
2023
2024 tipc_node_read_unlock(node);
2025 }
2026 done = 1;
2027 out:
2028 cb->args[0] = done;
2029 cb->args[1] = last_addr;
2030 rcu_read_unlock();
2031
2032 return skb->len;
2033 }
2034
2035 /* tipc_node_find_by_name - locate owner node of link by link's name
2036 * @net: the applicable net namespace
2037 * @name: pointer to link name string
2038 * @bearer_id: pointer to index in 'node->links' array where the link was found.
2039 *
2040 * Returns pointer to node owning the link, or 0 if no matching link is found.
2041 */
2042 static struct tipc_node *tipc_node_find_by_name(struct net *net,
2043 const char *link_name,
2044 unsigned int *bearer_id)
2045 {
2046 struct tipc_net *tn = net_generic(net, tipc_net_id);
2047 struct tipc_link *l;
2048 struct tipc_node *n;
2049 struct tipc_node *found_node = NULL;
2050 int i;
2051
2052 *bearer_id = 0;
2053 rcu_read_lock();
2054 list_for_each_entry_rcu(n, &tn->node_list, list) {
2055 tipc_node_read_lock(n);
2056 for (i = 0; i < MAX_BEARERS; i++) {
2057 l = n->links[i].link;
2058 if (l && !strcmp(tipc_link_name(l), link_name)) {
2059 *bearer_id = i;
2060 found_node = n;
2061 break;
2062 }
2063 }
2064 tipc_node_read_unlock(n);
2065 if (found_node)
2066 break;
2067 }
2068 rcu_read_unlock();
2069
2070 return found_node;
2071 }
2072
2073 int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
2074 {
2075 int err;
2076 int res = 0;
2077 int bearer_id;
2078 char *name;
2079 struct tipc_link *link;
2080 struct tipc_node *node;
2081 struct sk_buff_head xmitq;
2082 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2083 struct net *net = sock_net(skb->sk);
2084
2085 __skb_queue_head_init(&xmitq);
2086
2087 if (!info->attrs[TIPC_NLA_LINK])
2088 return -EINVAL;
2089
2090 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2091 info->attrs[TIPC_NLA_LINK],
2092 tipc_nl_link_policy, info->extack);
2093 if (err)
2094 return err;
2095
2096 if (!attrs[TIPC_NLA_LINK_NAME])
2097 return -EINVAL;
2098
2099 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2100
2101 if (strcmp(name, tipc_bclink_name) == 0)
2102 return tipc_nl_bc_link_set(net, attrs);
2103
2104 node = tipc_node_find_by_name(net, name, &bearer_id);
2105 if (!node)
2106 return -EINVAL;
2107
2108 tipc_node_read_lock(node);
2109
2110 link = node->links[bearer_id].link;
2111 if (!link) {
2112 res = -EINVAL;
2113 goto out;
2114 }
2115
2116 if (attrs[TIPC_NLA_LINK_PROP]) {
2117 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2118
2119 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
2120 props);
2121 if (err) {
2122 res = err;
2123 goto out;
2124 }
2125
2126 if (props[TIPC_NLA_PROP_TOL]) {
2127 u32 tol;
2128
2129 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2130 tipc_link_set_tolerance(link, tol, &xmitq);
2131 }
2132 if (props[TIPC_NLA_PROP_PRIO]) {
2133 u32 prio;
2134
2135 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2136 tipc_link_set_prio(link, prio, &xmitq);
2137 }
2138 if (props[TIPC_NLA_PROP_WIN]) {
2139 u32 win;
2140
2141 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2142 tipc_link_set_queue_limits(link, win);
2143 }
2144 }
2145
2146 out:
2147 tipc_node_read_unlock(node);
2148 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr);
2149 return res;
2150 }
2151
2152 int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
2153 {
2154 struct net *net = genl_info_net(info);
2155 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2156 struct tipc_nl_msg msg;
2157 char *name;
2158 int err;
2159
2160 msg.portid = info->snd_portid;
2161 msg.seq = info->snd_seq;
2162
2163 if (!info->attrs[TIPC_NLA_LINK])
2164 return -EINVAL;
2165
2166 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2167 info->attrs[TIPC_NLA_LINK],
2168 tipc_nl_link_policy, info->extack);
2169 if (err)
2170 return err;
2171
2172 if (!attrs[TIPC_NLA_LINK_NAME])
2173 return -EINVAL;
2174
2175 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2176
2177 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2178 if (!msg.skb)
2179 return -ENOMEM;
2180
2181 if (strcmp(name, tipc_bclink_name) == 0) {
2182 err = tipc_nl_add_bc_link(net, &msg);
2183 if (err)
2184 goto err_free;
2185 } else {
2186 int bearer_id;
2187 struct tipc_node *node;
2188 struct tipc_link *link;
2189
2190 node = tipc_node_find_by_name(net, name, &bearer_id);
2191 if (!node) {
2192 err = -EINVAL;
2193 goto err_free;
2194 }
2195
2196 tipc_node_read_lock(node);
2197 link = node->links[bearer_id].link;
2198 if (!link) {
2199 tipc_node_read_unlock(node);
2200 err = -EINVAL;
2201 goto err_free;
2202 }
2203
2204 err = __tipc_nl_add_link(net, &msg, link, 0);
2205 tipc_node_read_unlock(node);
2206 if (err)
2207 goto err_free;
2208 }
2209
2210 return genlmsg_reply(msg.skb, info);
2211
2212 err_free:
2213 nlmsg_free(msg.skb);
2214 return err;
2215 }
2216
2217 int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
2218 {
2219 int err;
2220 char *link_name;
2221 unsigned int bearer_id;
2222 struct tipc_link *link;
2223 struct tipc_node *node;
2224 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2225 struct net *net = sock_net(skb->sk);
2226 struct tipc_link_entry *le;
2227
2228 if (!info->attrs[TIPC_NLA_LINK])
2229 return -EINVAL;
2230
2231 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_LINK_MAX,
2232 info->attrs[TIPC_NLA_LINK],
2233 tipc_nl_link_policy, info->extack);
2234 if (err)
2235 return err;
2236
2237 if (!attrs[TIPC_NLA_LINK_NAME])
2238 return -EINVAL;
2239
2240 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2241
2242 if (strcmp(link_name, tipc_bclink_name) == 0) {
2243 err = tipc_bclink_reset_stats(net);
2244 if (err)
2245 return err;
2246 return 0;
2247 }
2248
2249 node = tipc_node_find_by_name(net, link_name, &bearer_id);
2250 if (!node)
2251 return -EINVAL;
2252
2253 le = &node->links[bearer_id];
2254 tipc_node_read_lock(node);
2255 spin_lock_bh(&le->lock);
2256 link = node->links[bearer_id].link;
2257 if (!link) {
2258 spin_unlock_bh(&le->lock);
2259 tipc_node_read_unlock(node);
2260 return -EINVAL;
2261 }
2262 tipc_link_reset_stats(link);
2263 spin_unlock_bh(&le->lock);
2264 tipc_node_read_unlock(node);
2265 return 0;
2266 }
2267
2268 /* Caller should hold node lock */
2269 static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
2270 struct tipc_node *node, u32 *prev_link)
2271 {
2272 u32 i;
2273 int err;
2274
2275 for (i = *prev_link; i < MAX_BEARERS; i++) {
2276 *prev_link = i;
2277
2278 if (!node->links[i].link)
2279 continue;
2280
2281 err = __tipc_nl_add_link(net, msg,
2282 node->links[i].link, NLM_F_MULTI);
2283 if (err)
2284 return err;
2285 }
2286 *prev_link = 0;
2287
2288 return 0;
2289 }
2290
2291 int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
2292 {
2293 struct net *net = sock_net(skb->sk);
2294 struct tipc_net *tn = net_generic(net, tipc_net_id);
2295 struct tipc_node *node;
2296 struct tipc_nl_msg msg;
2297 u32 prev_node = cb->args[0];
2298 u32 prev_link = cb->args[1];
2299 int done = cb->args[2];
2300 int err;
2301
2302 if (done)
2303 return 0;
2304
2305 msg.skb = skb;
2306 msg.portid = NETLINK_CB(cb->skb).portid;
2307 msg.seq = cb->nlh->nlmsg_seq;
2308
2309 rcu_read_lock();
2310 if (prev_node) {
2311 node = tipc_node_find(net, prev_node);
2312 if (!node) {
2313 /* We never set seq or call nl_dump_check_consistent()
2314 * this means that setting prev_seq here will cause the
2315 * consistence check to fail in the netlink callback
2316 * handler. Resulting in the last NLMSG_DONE message
2317 * having the NLM_F_DUMP_INTR flag set.
2318 */
2319 cb->prev_seq = 1;
2320 goto out;
2321 }
2322 tipc_node_put(node);
2323
2324 list_for_each_entry_continue_rcu(node, &tn->node_list,
2325 list) {
2326 tipc_node_read_lock(node);
2327 err = __tipc_nl_add_node_links(net, &msg, node,
2328 &prev_link);
2329 tipc_node_read_unlock(node);
2330 if (err)
2331 goto out;
2332
2333 prev_node = node->addr;
2334 }
2335 } else {
2336 err = tipc_nl_add_bc_link(net, &msg);
2337 if (err)
2338 goto out;
2339
2340 list_for_each_entry_rcu(node, &tn->node_list, list) {
2341 tipc_node_read_lock(node);
2342 err = __tipc_nl_add_node_links(net, &msg, node,
2343 &prev_link);
2344 tipc_node_read_unlock(node);
2345 if (err)
2346 goto out;
2347
2348 prev_node = node->addr;
2349 }
2350 }
2351 done = 1;
2352 out:
2353 rcu_read_unlock();
2354
2355 cb->args[0] = prev_node;
2356 cb->args[1] = prev_link;
2357 cb->args[2] = done;
2358
2359 return skb->len;
2360 }
2361
2362 int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2363 {
2364 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2365 struct net *net = sock_net(skb->sk);
2366 int err;
2367
2368 if (!info->attrs[TIPC_NLA_MON])
2369 return -EINVAL;
2370
2371 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MON_MAX,
2372 info->attrs[TIPC_NLA_MON],
2373 tipc_nl_monitor_policy,
2374 info->extack);
2375 if (err)
2376 return err;
2377
2378 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2379 u32 val;
2380
2381 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2382 err = tipc_nl_monitor_set_threshold(net, val);
2383 if (err)
2384 return err;
2385 }
2386
2387 return 0;
2388 }
2389
2390 static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2391 {
2392 struct nlattr *attrs;
2393 void *hdr;
2394 u32 val;
2395
2396 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2397 0, TIPC_NL_MON_GET);
2398 if (!hdr)
2399 return -EMSGSIZE;
2400
2401 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MON);
2402 if (!attrs)
2403 goto msg_full;
2404
2405 val = tipc_nl_monitor_get_threshold(net);
2406
2407 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2408 goto attr_msg_full;
2409
2410 nla_nest_end(msg->skb, attrs);
2411 genlmsg_end(msg->skb, hdr);
2412
2413 return 0;
2414
2415 attr_msg_full:
2416 nla_nest_cancel(msg->skb, attrs);
2417 msg_full:
2418 genlmsg_cancel(msg->skb, hdr);
2419
2420 return -EMSGSIZE;
2421 }
2422
2423 int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2424 {
2425 struct net *net = sock_net(skb->sk);
2426 struct tipc_nl_msg msg;
2427 int err;
2428
2429 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2430 if (!msg.skb)
2431 return -ENOMEM;
2432 msg.portid = info->snd_portid;
2433 msg.seq = info->snd_seq;
2434
2435 err = __tipc_nl_add_monitor_prop(net, &msg);
2436 if (err) {
2437 nlmsg_free(msg.skb);
2438 return err;
2439 }
2440
2441 return genlmsg_reply(msg.skb, info);
2442 }
2443
2444 int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2445 {
2446 struct net *net = sock_net(skb->sk);
2447 u32 prev_bearer = cb->args[0];
2448 struct tipc_nl_msg msg;
2449 int bearer_id;
2450 int err;
2451
2452 if (prev_bearer == MAX_BEARERS)
2453 return 0;
2454
2455 msg.skb = skb;
2456 msg.portid = NETLINK_CB(cb->skb).portid;
2457 msg.seq = cb->nlh->nlmsg_seq;
2458
2459 rtnl_lock();
2460 for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
2461 err = __tipc_nl_add_monitor(net, &msg, bearer_id);
2462 if (err)
2463 break;
2464 }
2465 rtnl_unlock();
2466 cb->args[0] = bearer_id;
2467
2468 return skb->len;
2469 }
2470
2471 int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2472 struct netlink_callback *cb)
2473 {
2474 struct net *net = sock_net(skb->sk);
2475 u32 prev_node = cb->args[1];
2476 u32 bearer_id = cb->args[2];
2477 int done = cb->args[0];
2478 struct tipc_nl_msg msg;
2479 int err;
2480
2481 if (!prev_node) {
2482 struct nlattr **attrs;
2483 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2484
2485 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2486 if (err)
2487 return err;
2488
2489 if (!attrs[TIPC_NLA_MON])
2490 return -EINVAL;
2491
2492 err = nla_parse_nested_deprecated(mon, TIPC_NLA_MON_MAX,
2493 attrs[TIPC_NLA_MON],
2494 tipc_nl_monitor_policy,
2495 NULL);
2496 if (err)
2497 return err;
2498
2499 if (!mon[TIPC_NLA_MON_REF])
2500 return -EINVAL;
2501
2502 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2503
2504 if (bearer_id >= MAX_BEARERS)
2505 return -EINVAL;
2506 }
2507
2508 if (done)
2509 return 0;
2510
2511 msg.skb = skb;
2512 msg.portid = NETLINK_CB(cb->skb).portid;
2513 msg.seq = cb->nlh->nlmsg_seq;
2514
2515 rtnl_lock();
2516 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2517 if (!err)
2518 done = 1;
2519
2520 rtnl_unlock();
2521 cb->args[0] = done;
2522 cb->args[1] = prev_node;
2523 cb->args[2] = bearer_id;
2524
2525 return skb->len;
2526 }
2527
2528 u32 tipc_node_get_addr(struct tipc_node *node)
2529 {
2530 return (node) ? node->addr : 0;
2531 }
2532
2533 /**
2534 * tipc_node_dump - dump TIPC node data
2535 * @n: tipc node to be dumped
2536 * @more: dump more?
2537 * - false: dump only tipc node data
2538 * - true: dump node link data as well
2539 * @buf: returned buffer of dump data in format
2540 */
2541 int tipc_node_dump(struct tipc_node *n, bool more, char *buf)
2542 {
2543 int i = 0;
2544 size_t sz = (more) ? NODE_LMAX : NODE_LMIN;
2545
2546 if (!n) {
2547 i += scnprintf(buf, sz, "node data: (null)\n");
2548 return i;
2549 }
2550
2551 i += scnprintf(buf, sz, "node data: %x", n->addr);
2552 i += scnprintf(buf + i, sz - i, " %x", n->state);
2553 i += scnprintf(buf + i, sz - i, " %d", n->active_links[0]);
2554 i += scnprintf(buf + i, sz - i, " %d", n->active_links[1]);
2555 i += scnprintf(buf + i, sz - i, " %x", n->action_flags);
2556 i += scnprintf(buf + i, sz - i, " %u", n->failover_sent);
2557 i += scnprintf(buf + i, sz - i, " %u", n->sync_point);
2558 i += scnprintf(buf + i, sz - i, " %d", n->link_cnt);
2559 i += scnprintf(buf + i, sz - i, " %u", n->working_links);
2560 i += scnprintf(buf + i, sz - i, " %x", n->capabilities);
2561 i += scnprintf(buf + i, sz - i, " %lu\n", n->keepalive_intv);
2562
2563 if (!more)
2564 return i;
2565
2566 i += scnprintf(buf + i, sz - i, "link_entry[0]:\n");
2567 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[0].mtu);
2568 i += scnprintf(buf + i, sz - i, " media: ");
2569 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[0].maddr);
2570 i += scnprintf(buf + i, sz - i, "\n");
2571 i += tipc_link_dump(n->links[0].link, TIPC_DUMP_NONE, buf + i);
2572 i += scnprintf(buf + i, sz - i, " inputq: ");
2573 i += tipc_list_dump(&n->links[0].inputq, false, buf + i);
2574
2575 i += scnprintf(buf + i, sz - i, "link_entry[1]:\n");
2576 i += scnprintf(buf + i, sz - i, " mtu: %u\n", n->links[1].mtu);
2577 i += scnprintf(buf + i, sz - i, " media: ");
2578 i += tipc_media_addr_printf(buf + i, sz - i, &n->links[1].maddr);
2579 i += scnprintf(buf + i, sz - i, "\n");
2580 i += tipc_link_dump(n->links[1].link, TIPC_DUMP_NONE, buf + i);
2581 i += scnprintf(buf + i, sz - i, " inputq: ");
2582 i += tipc_list_dump(&n->links[1].inputq, false, buf + i);
2583
2584 i += scnprintf(buf + i, sz - i, "bclink:\n ");
2585 i += tipc_link_dump(n->bc_entry.link, TIPC_DUMP_NONE, buf + i);
2586
2587 return i;
2588 }
Mirror of linux-2.6-arm at arm.linux.org.uk