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