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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / tipc / node.c
blob9036d8756e731ab02d75a520c489728cee621faf
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(struct timer_list *t);
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 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 timer_setup(&n->timer, tipc_node_timeout, 0);
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(struct timer_list *t)
504 {
505 struct tipc_node *n = from_timer(n, t, timer);
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 (!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 node_is_up(struct tipc_node *n)
721 {
722 return n->active_links[0] != INVALID_BEARER_ID;
723 }
724
725 bool tipc_node_is_up(struct net *net, u32 addr)
726 {
727 struct tipc_node *n;
728 bool retval = false;
729
730 if (in_own_node(net, addr))
731 return true;
732
733 n = tipc_node_find(net, addr);
734 if (!n)
735 return false;
736 retval = node_is_up(n);
737 tipc_node_put(n);
738 return retval;
739 }
740
741 void tipc_node_check_dest(struct net *net, u32 onode,
742 struct tipc_bearer *b,
743 u16 capabilities, u32 signature,
744 struct tipc_media_addr *maddr,
745 bool *respond, bool *dupl_addr)
746 {
747 struct tipc_node *n;
748 struct tipc_link *l;
749 struct tipc_link_entry *le;
750 bool addr_match = false;
751 bool sign_match = false;
752 bool link_up = false;
753 bool accept_addr = false;
754 bool reset = true;
755 char *if_name;
756 unsigned long intv;
757
758 *dupl_addr = false;
759 *respond = false;
760
761 n = tipc_node_create(net, onode, capabilities);
762 if (!n)
763 return;
764
765 tipc_node_write_lock(n);
766
767 le = &n->links[b->identity];
768
769 /* Prepare to validate requesting node's signature and media address */
770 l = le->link;
771 link_up = l && tipc_link_is_up(l);
772 addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
773 sign_match = (signature == n->signature);
774
775 /* These three flags give us eight permutations: */
776
777 if (sign_match && addr_match && link_up) {
778 /* All is fine. Do nothing. */
779 reset = false;
780 } else if (sign_match && addr_match && !link_up) {
781 /* Respond. The link will come up in due time */
782 *respond = true;
783 } else if (sign_match && !addr_match && link_up) {
784 /* Peer has changed i/f address without rebooting.
785 * If so, the link will reset soon, and the next
786 * discovery will be accepted. So we can ignore it.
787 * It may also be an cloned or malicious peer having
788 * chosen the same node address and signature as an
789 * existing one.
790 * Ignore requests until the link goes down, if ever.
791 */
792 *dupl_addr = true;
793 } else if (sign_match && !addr_match && !link_up) {
794 /* Peer link has changed i/f address without rebooting.
795 * It may also be a cloned or malicious peer; we can't
796 * distinguish between the two.
797 * The signature is correct, so we must accept.
798 */
799 accept_addr = true;
800 *respond = true;
801 } else if (!sign_match && addr_match && link_up) {
802 /* Peer node rebooted. Two possibilities:
803 * - Delayed re-discovery; this link endpoint has already
804 * reset and re-established contact with the peer, before
805 * receiving a discovery message from that node.
806 * (The peer happened to receive one from this node first).
807 * - The peer came back so fast that our side has not
808 * discovered it yet. Probing from this side will soon
809 * reset the link, since there can be no working link
810 * endpoint at the peer end, and the link will re-establish.
811 * Accept the signature, since it comes from a known peer.
812 */
813 n->signature = signature;
814 } else if (!sign_match && addr_match && !link_up) {
815 /* The peer node has rebooted.
816 * Accept signature, since it is a known peer.
817 */
818 n->signature = signature;
819 *respond = true;
820 } else if (!sign_match && !addr_match && link_up) {
821 /* Peer rebooted with new address, or a new/duplicate peer.
822 * Ignore until the link goes down, if ever.
823 */
824 *dupl_addr = true;
825 } else if (!sign_match && !addr_match && !link_up) {
826 /* Peer rebooted with new address, or it is a new peer.
827 * Accept signature and address.
828 */
829 n->signature = signature;
830 accept_addr = true;
831 *respond = true;
832 }
833
834 if (!accept_addr)
835 goto exit;
836
837 /* Now create new link if not already existing */
838 if (!l) {
839 if (n->link_cnt == 2) {
840 pr_warn("Cannot establish 3rd link to %x\n", n->addr);
841 goto exit;
842 }
843 if_name = strchr(b->name, ':') + 1;
844 if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
845 b->net_plane, b->mtu, b->priority,
846 b->window, mod(tipc_net(net)->random),
847 tipc_own_addr(net), onode,
848 n->capabilities,
849 tipc_bc_sndlink(n->net), n->bc_entry.link,
850 &le->inputq,
851 &n->bc_entry.namedq, &l)) {
852 *respond = false;
853 goto exit;
854 }
855 tipc_link_reset(l);
856 tipc_link_fsm_evt(l, LINK_RESET_EVT);
857 if (n->state == NODE_FAILINGOVER)
858 tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
859 le->link = l;
860 n->link_cnt++;
861 tipc_node_calculate_timer(n, l);
862 if (n->link_cnt == 1) {
863 intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
864 if (!mod_timer(&n->timer, intv))
865 tipc_node_get(n);
866 }
867 }
868 memcpy(&le->maddr, maddr, sizeof(*maddr));
869 exit:
870 tipc_node_write_unlock(n);
871 if (reset && l && !tipc_link_is_reset(l))
872 tipc_node_link_down(n, b->identity, false);
873 tipc_node_put(n);
874 }
875
876 void tipc_node_delete_links(struct net *net, int bearer_id)
877 {
878 struct tipc_net *tn = net_generic(net, tipc_net_id);
879 struct tipc_node *n;
880
881 rcu_read_lock();
882 list_for_each_entry_rcu(n, &tn->node_list, list) {
883 tipc_node_link_down(n, bearer_id, true);
884 }
885 rcu_read_unlock();
886 }
887
888 static void tipc_node_reset_links(struct tipc_node *n)
889 {
890 char addr_string[16];
891 int i;
892
893 pr_warn("Resetting all links to %s\n",
894 tipc_addr_string_fill(addr_string, n->addr));
895
896 for (i = 0; i < MAX_BEARERS; i++) {
897 tipc_node_link_down(n, i, false);
898 }
899 }
900
901 /* tipc_node_fsm_evt - node finite state machine
902 * Determines when contact is allowed with peer node
903 */
904 static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
905 {
906 int state = n->state;
907
908 switch (state) {
909 case SELF_DOWN_PEER_DOWN:
910 switch (evt) {
911 case SELF_ESTABL_CONTACT_EVT:
912 state = SELF_UP_PEER_COMING;
913 break;
914 case PEER_ESTABL_CONTACT_EVT:
915 state = SELF_COMING_PEER_UP;
916 break;
917 case SELF_LOST_CONTACT_EVT:
918 case PEER_LOST_CONTACT_EVT:
919 break;
920 case NODE_SYNCH_END_EVT:
921 case NODE_SYNCH_BEGIN_EVT:
922 case NODE_FAILOVER_BEGIN_EVT:
923 case NODE_FAILOVER_END_EVT:
924 default:
925 goto illegal_evt;
926 }
927 break;
928 case SELF_UP_PEER_UP:
929 switch (evt) {
930 case SELF_LOST_CONTACT_EVT:
931 state = SELF_DOWN_PEER_LEAVING;
932 break;
933 case PEER_LOST_CONTACT_EVT:
934 state = SELF_LEAVING_PEER_DOWN;
935 break;
936 case NODE_SYNCH_BEGIN_EVT:
937 state = NODE_SYNCHING;
938 break;
939 case NODE_FAILOVER_BEGIN_EVT:
940 state = NODE_FAILINGOVER;
941 break;
942 case SELF_ESTABL_CONTACT_EVT:
943 case PEER_ESTABL_CONTACT_EVT:
944 case NODE_SYNCH_END_EVT:
945 case NODE_FAILOVER_END_EVT:
946 break;
947 default:
948 goto illegal_evt;
949 }
950 break;
951 case SELF_DOWN_PEER_LEAVING:
952 switch (evt) {
953 case PEER_LOST_CONTACT_EVT:
954 state = SELF_DOWN_PEER_DOWN;
955 break;
956 case SELF_ESTABL_CONTACT_EVT:
957 case PEER_ESTABL_CONTACT_EVT:
958 case SELF_LOST_CONTACT_EVT:
959 break;
960 case NODE_SYNCH_END_EVT:
961 case NODE_SYNCH_BEGIN_EVT:
962 case NODE_FAILOVER_BEGIN_EVT:
963 case NODE_FAILOVER_END_EVT:
964 default:
965 goto illegal_evt;
966 }
967 break;
968 case SELF_UP_PEER_COMING:
969 switch (evt) {
970 case PEER_ESTABL_CONTACT_EVT:
971 state = SELF_UP_PEER_UP;
972 break;
973 case SELF_LOST_CONTACT_EVT:
974 state = SELF_DOWN_PEER_DOWN;
975 break;
976 case SELF_ESTABL_CONTACT_EVT:
977 case PEER_LOST_CONTACT_EVT:
978 case NODE_SYNCH_END_EVT:
979 case NODE_FAILOVER_BEGIN_EVT:
980 break;
981 case NODE_SYNCH_BEGIN_EVT:
982 case NODE_FAILOVER_END_EVT:
983 default:
984 goto illegal_evt;
985 }
986 break;
987 case SELF_COMING_PEER_UP:
988 switch (evt) {
989 case SELF_ESTABL_CONTACT_EVT:
990 state = SELF_UP_PEER_UP;
991 break;
992 case PEER_LOST_CONTACT_EVT:
993 state = SELF_DOWN_PEER_DOWN;
994 break;
995 case SELF_LOST_CONTACT_EVT:
996 case PEER_ESTABL_CONTACT_EVT:
997 break;
998 case NODE_SYNCH_END_EVT:
999 case NODE_SYNCH_BEGIN_EVT:
1000 case NODE_FAILOVER_BEGIN_EVT:
1001 case NODE_FAILOVER_END_EVT:
1002 default:
1003 goto illegal_evt;
1004 }
1005 break;
1006 case SELF_LEAVING_PEER_DOWN:
1007 switch (evt) {
1008 case SELF_LOST_CONTACT_EVT:
1009 state = SELF_DOWN_PEER_DOWN;
1010 break;
1011 case SELF_ESTABL_CONTACT_EVT:
1012 case PEER_ESTABL_CONTACT_EVT:
1013 case PEER_LOST_CONTACT_EVT:
1014 break;
1015 case NODE_SYNCH_END_EVT:
1016 case NODE_SYNCH_BEGIN_EVT:
1017 case NODE_FAILOVER_BEGIN_EVT:
1018 case NODE_FAILOVER_END_EVT:
1019 default:
1020 goto illegal_evt;
1021 }
1022 break;
1023 case NODE_FAILINGOVER:
1024 switch (evt) {
1025 case SELF_LOST_CONTACT_EVT:
1026 state = SELF_DOWN_PEER_LEAVING;
1027 break;
1028 case PEER_LOST_CONTACT_EVT:
1029 state = SELF_LEAVING_PEER_DOWN;
1030 break;
1031 case NODE_FAILOVER_END_EVT:
1032 state = SELF_UP_PEER_UP;
1033 break;
1034 case NODE_FAILOVER_BEGIN_EVT:
1035 case SELF_ESTABL_CONTACT_EVT:
1036 case PEER_ESTABL_CONTACT_EVT:
1037 break;
1038 case NODE_SYNCH_BEGIN_EVT:
1039 case NODE_SYNCH_END_EVT:
1040 default:
1041 goto illegal_evt;
1042 }
1043 break;
1044 case NODE_SYNCHING:
1045 switch (evt) {
1046 case SELF_LOST_CONTACT_EVT:
1047 state = SELF_DOWN_PEER_LEAVING;
1048 break;
1049 case PEER_LOST_CONTACT_EVT:
1050 state = SELF_LEAVING_PEER_DOWN;
1051 break;
1052 case NODE_SYNCH_END_EVT:
1053 state = SELF_UP_PEER_UP;
1054 break;
1055 case NODE_FAILOVER_BEGIN_EVT:
1056 state = NODE_FAILINGOVER;
1057 break;
1058 case NODE_SYNCH_BEGIN_EVT:
1059 case SELF_ESTABL_CONTACT_EVT:
1060 case PEER_ESTABL_CONTACT_EVT:
1061 break;
1062 case NODE_FAILOVER_END_EVT:
1063 default:
1064 goto illegal_evt;
1065 }
1066 break;
1067 default:
1068 pr_err("Unknown node fsm state %x\n", state);
1069 break;
1070 }
1071 n->state = state;
1072 return;
1073
1074 illegal_evt:
1075 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1076 }
1077
1078 static void node_lost_contact(struct tipc_node *n,
1079 struct sk_buff_head *inputq)
1080 {
1081 char addr_string[16];
1082 struct tipc_sock_conn *conn, *safe;
1083 struct tipc_link *l;
1084 struct list_head *conns = &n->conn_sks;
1085 struct sk_buff *skb;
1086 uint i;
1087
1088 pr_debug("Lost contact with %s\n",
1089 tipc_addr_string_fill(addr_string, n->addr));
1090
1091 /* Clean up broadcast state */
1092 tipc_bcast_remove_peer(n->net, n->bc_entry.link);
1093
1094 /* Abort any ongoing link failover */
1095 for (i = 0; i < MAX_BEARERS; i++) {
1096 l = n->links[i].link;
1097 if (l)
1098 tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
1099 }
1100
1101 /* Notify publications from this node */
1102 n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
1103
1104 /* Notify sockets connected to node */
1105 list_for_each_entry_safe(conn, safe, conns, list) {
1106 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
1107 SHORT_H_SIZE, 0, tipc_own_addr(n->net),
1108 conn->peer_node, conn->port,
1109 conn->peer_port, TIPC_ERR_NO_NODE);
1110 if (likely(skb))
1111 skb_queue_tail(inputq, skb);
1112 list_del(&conn->list);
1113 kfree(conn);
1114 }
1115 }
1116
1117 /**
1118 * tipc_node_get_linkname - get the name of a link
1119 *
1120 * @bearer_id: id of the bearer
1121 * @node: peer node address
1122 * @linkname: link name output buffer
1123 *
1124 * Returns 0 on success
1125 */
1126 int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
1127 char *linkname, size_t len)
1128 {
1129 struct tipc_link *link;
1130 int err = -EINVAL;
1131 struct tipc_node *node = tipc_node_find(net, addr);
1132
1133 if (!node)
1134 return err;
1135
1136 if (bearer_id >= MAX_BEARERS)
1137 goto exit;
1138
1139 tipc_node_read_lock(node);
1140 link = node->links[bearer_id].link;
1141 if (link) {
1142 strncpy(linkname, tipc_link_name(link), len);
1143 err = 0;
1144 }
1145 tipc_node_read_unlock(node);
1146 exit:
1147 tipc_node_put(node);
1148 return err;
1149 }
1150
1151 /* Caller should hold node lock for the passed node */
1152 static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
1153 {
1154 void *hdr;
1155 struct nlattr *attrs;
1156
1157 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1158 NLM_F_MULTI, TIPC_NL_NODE_GET);
1159 if (!hdr)
1160 return -EMSGSIZE;
1161
1162 attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE);
1163 if (!attrs)
1164 goto msg_full;
1165
1166 if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
1167 goto attr_msg_full;
1168 if (node_is_up(node))
1169 if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
1170 goto attr_msg_full;
1171
1172 nla_nest_end(msg->skb, attrs);
1173 genlmsg_end(msg->skb, hdr);
1174
1175 return 0;
1176
1177 attr_msg_full:
1178 nla_nest_cancel(msg->skb, attrs);
1179 msg_full:
1180 genlmsg_cancel(msg->skb, hdr);
1181
1182 return -EMSGSIZE;
1183 }
1184
1185 /**
1186 * tipc_node_xmit() is the general link level function for message sending
1187 * @net: the applicable net namespace
1188 * @list: chain of buffers containing message
1189 * @dnode: address of destination node
1190 * @selector: a number used for deterministic link selection
1191 * Consumes the buffer chain.
1192 * Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1193 */
1194 int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
1195 u32 dnode, int selector)
1196 {
1197 struct tipc_link_entry *le = NULL;
1198 struct tipc_node *n;
1199 struct sk_buff_head xmitq;
1200 int bearer_id;
1201 int rc;
1202
1203 if (in_own_node(net, dnode)) {
1204 tipc_sk_rcv(net, list);
1205 return 0;
1206 }
1207
1208 n = tipc_node_find(net, dnode);
1209 if (unlikely(!n)) {
1210 skb_queue_purge(list);
1211 return -EHOSTUNREACH;
1212 }
1213
1214 tipc_node_read_lock(n);
1215 bearer_id = n->active_links[selector & 1];
1216 if (unlikely(bearer_id == INVALID_BEARER_ID)) {
1217 tipc_node_read_unlock(n);
1218 tipc_node_put(n);
1219 skb_queue_purge(list);
1220 return -EHOSTUNREACH;
1221 }
1222
1223 __skb_queue_head_init(&xmitq);
1224 le = &n->links[bearer_id];
1225 spin_lock_bh(&le->lock);
1226 rc = tipc_link_xmit(le->link, list, &xmitq);
1227 spin_unlock_bh(&le->lock);
1228 tipc_node_read_unlock(n);
1229
1230 if (unlikely(rc == -ENOBUFS))
1231 tipc_node_link_down(n, bearer_id, false);
1232 else
1233 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1234
1235 tipc_node_put(n);
1236
1237 return rc;
1238 }
1239
1240 /* tipc_node_xmit_skb(): send single buffer to destination
1241 * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
1242 * messages, which will not be rejected
1243 * The only exception is datagram messages rerouted after secondary
1244 * lookup, which are rare and safe to dispose of anyway.
1245 */
1246 int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1247 u32 selector)
1248 {
1249 struct sk_buff_head head;
1250
1251 skb_queue_head_init(&head);
1252 __skb_queue_tail(&head, skb);
1253 tipc_node_xmit(net, &head, dnode, selector);
1254 return 0;
1255 }
1256
1257 /* tipc_node_distr_xmit(): send single buffer msgs to individual destinations
1258 * Note: this is only for SYSTEM_IMPORTANCE messages, which cannot be rejected
1259 */
1260 int tipc_node_distr_xmit(struct net *net, struct sk_buff_head *xmitq)
1261 {
1262 struct sk_buff *skb;
1263 u32 selector, dnode;
1264
1265 while ((skb = __skb_dequeue(xmitq))) {
1266 selector = msg_origport(buf_msg(skb));
1267 dnode = msg_destnode(buf_msg(skb));
1268 tipc_node_xmit_skb(net, skb, dnode, selector);
1269 }
1270 return 0;
1271 }
1272
1273 void tipc_node_broadcast(struct net *net, struct sk_buff *skb)
1274 {
1275 struct sk_buff *txskb;
1276 struct tipc_node *n;
1277 u32 dst;
1278
1279 rcu_read_lock();
1280 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1281 dst = n->addr;
1282 if (in_own_node(net, dst))
1283 continue;
1284 if (!node_is_up(n))
1285 continue;
1286 txskb = pskb_copy(skb, GFP_ATOMIC);
1287 if (!txskb)
1288 break;
1289 msg_set_destnode(buf_msg(txskb), dst);
1290 tipc_node_xmit_skb(net, txskb, dst, 0);
1291 }
1292 rcu_read_unlock();
1293
1294 kfree_skb(skb);
1295 }
1296
1297 static void tipc_node_mcast_rcv(struct tipc_node *n)
1298 {
1299 struct tipc_bclink_entry *be = &n->bc_entry;
1300
1301 /* 'arrvq' is under inputq2's lock protection */
1302 spin_lock_bh(&be->inputq2.lock);
1303 spin_lock_bh(&be->inputq1.lock);
1304 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1305 spin_unlock_bh(&be->inputq1.lock);
1306 spin_unlock_bh(&be->inputq2.lock);
1307 tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
1308 }
1309
1310 static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1311 int bearer_id, struct sk_buff_head *xmitq)
1312 {
1313 struct tipc_link *ucl;
1314 int rc;
1315
1316 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr);
1317
1318 if (rc & TIPC_LINK_DOWN_EVT) {
1319 tipc_node_reset_links(n);
1320 return;
1321 }
1322
1323 if (!(rc & TIPC_LINK_SND_STATE))
1324 return;
1325
1326 /* If probe message, a STATE response will be sent anyway */
1327 if (msg_probe(hdr))
1328 return;
1329
1330 /* Produce a STATE message carrying broadcast NACK */
1331 tipc_node_read_lock(n);
1332 ucl = n->links[bearer_id].link;
1333 if (ucl)
1334 tipc_link_build_state_msg(ucl, xmitq);
1335 tipc_node_read_unlock(n);
1336 }
1337
1338 /**
1339 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1340 * @net: the applicable net namespace
1341 * @skb: TIPC packet
1342 * @bearer_id: id of bearer message arrived on
1343 *
1344 * Invoked with no locks held.
1345 */
1346 static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1347 {
1348 int rc;
1349 struct sk_buff_head xmitq;
1350 struct tipc_bclink_entry *be;
1351 struct tipc_link_entry *le;
1352 struct tipc_msg *hdr = buf_msg(skb);
1353 int usr = msg_user(hdr);
1354 u32 dnode = msg_destnode(hdr);
1355 struct tipc_node *n;
1356
1357 __skb_queue_head_init(&xmitq);
1358
1359 /* If NACK for other node, let rcv link for that node peek into it */
1360 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1361 n = tipc_node_find(net, dnode);
1362 else
1363 n = tipc_node_find(net, msg_prevnode(hdr));
1364 if (!n) {
1365 kfree_skb(skb);
1366 return;
1367 }
1368 be = &n->bc_entry;
1369 le = &n->links[bearer_id];
1370
1371 rc = tipc_bcast_rcv(net, be->link, skb);
1372
1373 /* Broadcast ACKs are sent on a unicast link */
1374 if (rc & TIPC_LINK_SND_STATE) {
1375 tipc_node_read_lock(n);
1376 tipc_link_build_state_msg(le->link, &xmitq);
1377 tipc_node_read_unlock(n);
1378 }
1379
1380 if (!skb_queue_empty(&xmitq))
1381 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1382
1383 if (!skb_queue_empty(&be->inputq1))
1384 tipc_node_mcast_rcv(n);
1385
1386 /* If reassembly or retransmission failure => reset all links to peer */
1387 if (rc & TIPC_LINK_DOWN_EVT)
1388 tipc_node_reset_links(n);
1389
1390 tipc_node_put(n);
1391 }
1392
1393 /**
1394 * tipc_node_check_state - check and if necessary update node state
1395 * @skb: TIPC packet
1396 * @bearer_id: identity of bearer delivering the packet
1397 * Returns true if state is ok, otherwise consumes buffer and returns false
1398 */
1399 static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1400 int bearer_id, struct sk_buff_head *xmitq)
1401 {
1402 struct tipc_msg *hdr = buf_msg(skb);
1403 int usr = msg_user(hdr);
1404 int mtyp = msg_type(hdr);
1405 u16 oseqno = msg_seqno(hdr);
1406 u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
1407 u16 exp_pkts = msg_msgcnt(hdr);
1408 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1409 int state = n->state;
1410 struct tipc_link *l, *tnl, *pl = NULL;
1411 struct tipc_media_addr *maddr;
1412 int pb_id;
1413
1414 l = n->links[bearer_id].link;
1415 if (!l)
1416 return false;
1417 rcv_nxt = tipc_link_rcv_nxt(l);
1418
1419
1420 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1421 return true;
1422
1423 /* Find parallel link, if any */
1424 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1425 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1426 pl = n->links[pb_id].link;
1427 break;
1428 }
1429 }
1430
1431 /* Check and update node accesibility if applicable */
1432 if (state == SELF_UP_PEER_COMING) {
1433 if (!tipc_link_is_up(l))
1434 return true;
1435 if (!msg_peer_link_is_up(hdr))
1436 return true;
1437 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1438 }
1439
1440 if (state == SELF_DOWN_PEER_LEAVING) {
1441 if (msg_peer_node_is_up(hdr))
1442 return false;
1443 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1444 return true;
1445 }
1446
1447 if (state == SELF_LEAVING_PEER_DOWN)
1448 return false;
1449
1450 /* Ignore duplicate packets */
1451 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1452 return true;
1453
1454 /* Initiate or update failover mode if applicable */
1455 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1456 syncpt = oseqno + exp_pkts - 1;
1457 if (pl && tipc_link_is_up(pl)) {
1458 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1459 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
1460 tipc_link_inputq(l));
1461 }
1462 /* If pkts arrive out of order, use lowest calculated syncpt */
1463 if (less(syncpt, n->sync_point))
1464 n->sync_point = syncpt;
1465 }
1466
1467 /* Open parallel link when tunnel link reaches synch point */
1468 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
1469 if (!more(rcv_nxt, n->sync_point))
1470 return true;
1471 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
1472 if (pl)
1473 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
1474 return true;
1475 }
1476
1477 /* No synching needed if only one link */
1478 if (!pl || !tipc_link_is_up(pl))
1479 return true;
1480
1481 /* Initiate synch mode if applicable */
1482 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
1483 syncpt = iseqno + exp_pkts - 1;
1484 if (!tipc_link_is_up(l))
1485 __tipc_node_link_up(n, bearer_id, xmitq);
1486 if (n->state == SELF_UP_PEER_UP) {
1487 n->sync_point = syncpt;
1488 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
1489 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
1490 }
1491 }
1492
1493 /* Open tunnel link when parallel link reaches synch point */
1494 if (n->state == NODE_SYNCHING) {
1495 if (tipc_link_is_synching(l)) {
1496 tnl = l;
1497 } else {
1498 tnl = pl;
1499 pl = l;
1500 }
1501 inputq_len = skb_queue_len(tipc_link_inputq(pl));
1502 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
1503 if (more(dlv_nxt, n->sync_point)) {
1504 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1505 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1506 return true;
1507 }
1508 if (l == pl)
1509 return true;
1510 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
1511 return true;
1512 if (usr == LINK_PROTOCOL)
1513 return true;
1514 return false;
1515 }
1516 return true;
1517 }
1518
1519 /**
1520 * tipc_rcv - process TIPC packets/messages arriving from off-node
1521 * @net: the applicable net namespace
1522 * @skb: TIPC packet
1523 * @bearer: pointer to bearer message arrived on
1524 *
1525 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1526 * structure (i.e. cannot be NULL), but bearer can be inactive.
1527 */
1528 void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
1529 {
1530 struct sk_buff_head xmitq;
1531 struct tipc_node *n;
1532 struct tipc_msg *hdr;
1533 int bearer_id = b->identity;
1534 struct tipc_link_entry *le;
1535 u32 self = tipc_own_addr(net);
1536 int usr, rc = 0;
1537 u16 bc_ack;
1538
1539 __skb_queue_head_init(&xmitq);
1540
1541 /* Ensure message is well-formed before touching the header */
1542 if (unlikely(!tipc_msg_validate(&skb)))
1543 goto discard;
1544 hdr = buf_msg(skb);
1545 usr = msg_user(hdr);
1546 bc_ack = msg_bcast_ack(hdr);
1547
1548 /* Handle arrival of discovery or broadcast packet */
1549 if (unlikely(msg_non_seq(hdr))) {
1550 if (unlikely(usr == LINK_CONFIG))
1551 return tipc_disc_rcv(net, skb, b);
1552 else
1553 return tipc_node_bc_rcv(net, skb, bearer_id);
1554 }
1555
1556 /* Discard unicast link messages destined for another node */
1557 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
1558 goto discard;
1559
1560 /* Locate neighboring node that sent packet */
1561 n = tipc_node_find(net, msg_prevnode(hdr));
1562 if (unlikely(!n))
1563 goto discard;
1564 le = &n->links[bearer_id];
1565
1566 /* Ensure broadcast reception is in synch with peer's send state */
1567 if (unlikely(usr == LINK_PROTOCOL))
1568 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
1569 else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack))
1570 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
1571
1572 /* Receive packet directly if conditions permit */
1573 tipc_node_read_lock(n);
1574 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
1575 spin_lock_bh(&le->lock);
1576 if (le->link) {
1577 rc = tipc_link_rcv(le->link, skb, &xmitq);
1578 skb = NULL;
1579 }
1580 spin_unlock_bh(&le->lock);
1581 }
1582 tipc_node_read_unlock(n);
1583
1584 /* Check/update node state before receiving */
1585 if (unlikely(skb)) {
1586 if (unlikely(skb_linearize(skb)))
1587 goto discard;
1588 tipc_node_write_lock(n);
1589 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
1590 if (le->link) {
1591 rc = tipc_link_rcv(le->link, skb, &xmitq);
1592 skb = NULL;
1593 }
1594 }
1595 tipc_node_write_unlock(n);
1596 }
1597
1598 if (unlikely(rc & TIPC_LINK_UP_EVT))
1599 tipc_node_link_up(n, bearer_id, &xmitq);
1600
1601 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
1602 tipc_node_link_down(n, bearer_id, false);
1603
1604 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
1605 tipc_named_rcv(net, &n->bc_entry.namedq);
1606
1607 if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
1608 tipc_node_mcast_rcv(n);
1609
1610 if (!skb_queue_empty(&le->inputq))
1611 tipc_sk_rcv(net, &le->inputq);
1612
1613 if (!skb_queue_empty(&xmitq))
1614 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1615
1616 tipc_node_put(n);
1617 discard:
1618 kfree_skb(skb);
1619 }
1620
1621 int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
1622 {
1623 struct net *net = sock_net(skb->sk);
1624 struct tipc_net *tn = net_generic(net, tipc_net_id);
1625 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
1626 struct tipc_node *peer;
1627 u32 addr;
1628 int err;
1629 int i;
1630
1631 /* We identify the peer by its net */
1632 if (!info->attrs[TIPC_NLA_NET])
1633 return -EINVAL;
1634
1635 err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
1636 info->attrs[TIPC_NLA_NET], tipc_nl_net_policy,
1637 info->extack);
1638 if (err)
1639 return err;
1640
1641 if (!attrs[TIPC_NLA_NET_ADDR])
1642 return -EINVAL;
1643
1644 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
1645
1646 if (in_own_node(net, addr))
1647 return -ENOTSUPP;
1648
1649 spin_lock_bh(&tn->node_list_lock);
1650 peer = tipc_node_find(net, addr);
1651 if (!peer) {
1652 spin_unlock_bh(&tn->node_list_lock);
1653 return -ENXIO;
1654 }
1655
1656 tipc_node_write_lock(peer);
1657 if (peer->state != SELF_DOWN_PEER_DOWN &&
1658 peer->state != SELF_DOWN_PEER_LEAVING) {
1659 tipc_node_write_unlock(peer);
1660 err = -EBUSY;
1661 goto err_out;
1662 }
1663
1664 for (i = 0; i < MAX_BEARERS; i++) {
1665 struct tipc_link_entry *le = &peer->links[i];
1666
1667 if (le->link) {
1668 kfree(le->link);
1669 le->link = NULL;
1670 peer->link_cnt--;
1671 }
1672 }
1673 tipc_node_write_unlock(peer);
1674 tipc_node_delete(peer);
1675
1676 err = 0;
1677 err_out:
1678 tipc_node_put(peer);
1679 spin_unlock_bh(&tn->node_list_lock);
1680
1681 return err;
1682 }
1683
1684 int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
1685 {
1686 int err;
1687 struct net *net = sock_net(skb->sk);
1688 struct tipc_net *tn = net_generic(net, tipc_net_id);
1689 int done = cb->args[0];
1690 int last_addr = cb->args[1];
1691 struct tipc_node *node;
1692 struct tipc_nl_msg msg;
1693
1694 if (done)
1695 return 0;
1696
1697 msg.skb = skb;
1698 msg.portid = NETLINK_CB(cb->skb).portid;
1699 msg.seq = cb->nlh->nlmsg_seq;
1700
1701 rcu_read_lock();
1702 if (last_addr) {
1703 node = tipc_node_find(net, last_addr);
1704 if (!node) {
1705 rcu_read_unlock();
1706 /* We never set seq or call nl_dump_check_consistent()
1707 * this means that setting prev_seq here will cause the
1708 * consistence check to fail in the netlink callback
1709 * handler. Resulting in the NLMSG_DONE message having
1710 * the NLM_F_DUMP_INTR flag set if the node state
1711 * changed while we released the lock.
1712 */
1713 cb->prev_seq = 1;
1714 return -EPIPE;
1715 }
1716 tipc_node_put(node);
1717 }
1718
1719 list_for_each_entry_rcu(node, &tn->node_list, list) {
1720 if (last_addr) {
1721 if (node->addr == last_addr)
1722 last_addr = 0;
1723 else
1724 continue;
1725 }
1726
1727 tipc_node_read_lock(node);
1728 err = __tipc_nl_add_node(&msg, node);
1729 if (err) {
1730 last_addr = node->addr;
1731 tipc_node_read_unlock(node);
1732 goto out;
1733 }
1734
1735 tipc_node_read_unlock(node);
1736 }
1737 done = 1;
1738 out:
1739 cb->args[0] = done;
1740 cb->args[1] = last_addr;
1741 rcu_read_unlock();
1742
1743 return skb->len;
1744 }
1745
1746 /* tipc_node_find_by_name - locate owner node of link by link's name
1747 * @net: the applicable net namespace
1748 * @name: pointer to link name string
1749 * @bearer_id: pointer to index in 'node->links' array where the link was found.
1750 *
1751 * Returns pointer to node owning the link, or 0 if no matching link is found.
1752 */
1753 static struct tipc_node *tipc_node_find_by_name(struct net *net,
1754 const char *link_name,
1755 unsigned int *bearer_id)
1756 {
1757 struct tipc_net *tn = net_generic(net, tipc_net_id);
1758 struct tipc_link *l;
1759 struct tipc_node *n;
1760 struct tipc_node *found_node = NULL;
1761 int i;
1762
1763 *bearer_id = 0;
1764 rcu_read_lock();
1765 list_for_each_entry_rcu(n, &tn->node_list, list) {
1766 tipc_node_read_lock(n);
1767 for (i = 0; i < MAX_BEARERS; i++) {
1768 l = n->links[i].link;
1769 if (l && !strcmp(tipc_link_name(l), link_name)) {
1770 *bearer_id = i;
1771 found_node = n;
1772 break;
1773 }
1774 }
1775 tipc_node_read_unlock(n);
1776 if (found_node)
1777 break;
1778 }
1779 rcu_read_unlock();
1780
1781 return found_node;
1782 }
1783
1784 int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
1785 {
1786 int err;
1787 int res = 0;
1788 int bearer_id;
1789 char *name;
1790 struct tipc_link *link;
1791 struct tipc_node *node;
1792 struct sk_buff_head xmitq;
1793 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1794 struct net *net = sock_net(skb->sk);
1795
1796 __skb_queue_head_init(&xmitq);
1797
1798 if (!info->attrs[TIPC_NLA_LINK])
1799 return -EINVAL;
1800
1801 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1802 info->attrs[TIPC_NLA_LINK],
1803 tipc_nl_link_policy, info->extack);
1804 if (err)
1805 return err;
1806
1807 if (!attrs[TIPC_NLA_LINK_NAME])
1808 return -EINVAL;
1809
1810 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1811
1812 if (strcmp(name, tipc_bclink_name) == 0)
1813 return tipc_nl_bc_link_set(net, attrs);
1814
1815 node = tipc_node_find_by_name(net, name, &bearer_id);
1816 if (!node)
1817 return -EINVAL;
1818
1819 tipc_node_read_lock(node);
1820
1821 link = node->links[bearer_id].link;
1822 if (!link) {
1823 res = -EINVAL;
1824 goto out;
1825 }
1826
1827 if (attrs[TIPC_NLA_LINK_PROP]) {
1828 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1829
1830 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
1831 props);
1832 if (err) {
1833 res = err;
1834 goto out;
1835 }
1836
1837 if (props[TIPC_NLA_PROP_TOL]) {
1838 u32 tol;
1839
1840 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1841 tipc_link_set_tolerance(link, tol, &xmitq);
1842 }
1843 if (props[TIPC_NLA_PROP_PRIO]) {
1844 u32 prio;
1845
1846 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1847 tipc_link_set_prio(link, prio, &xmitq);
1848 }
1849 if (props[TIPC_NLA_PROP_WIN]) {
1850 u32 win;
1851
1852 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1853 tipc_link_set_queue_limits(link, win);
1854 }
1855 }
1856
1857 out:
1858 tipc_node_read_unlock(node);
1859 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr);
1860 return res;
1861 }
1862
1863 int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
1864 {
1865 struct net *net = genl_info_net(info);
1866 struct tipc_nl_msg msg;
1867 char *name;
1868 int err;
1869
1870 msg.portid = info->snd_portid;
1871 msg.seq = info->snd_seq;
1872
1873 if (!info->attrs[TIPC_NLA_LINK_NAME])
1874 return -EINVAL;
1875 name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
1876
1877 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1878 if (!msg.skb)
1879 return -ENOMEM;
1880
1881 if (strcmp(name, tipc_bclink_name) == 0) {
1882 err = tipc_nl_add_bc_link(net, &msg);
1883 if (err)
1884 goto err_free;
1885 } else {
1886 int bearer_id;
1887 struct tipc_node *node;
1888 struct tipc_link *link;
1889
1890 node = tipc_node_find_by_name(net, name, &bearer_id);
1891 if (!node) {
1892 err = -EINVAL;
1893 goto err_free;
1894 }
1895
1896 tipc_node_read_lock(node);
1897 link = node->links[bearer_id].link;
1898 if (!link) {
1899 tipc_node_read_unlock(node);
1900 err = -EINVAL;
1901 goto err_free;
1902 }
1903
1904 err = __tipc_nl_add_link(net, &msg, link, 0);
1905 tipc_node_read_unlock(node);
1906 if (err)
1907 goto err_free;
1908 }
1909
1910 return genlmsg_reply(msg.skb, info);
1911
1912 err_free:
1913 nlmsg_free(msg.skb);
1914 return err;
1915 }
1916
1917 int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
1918 {
1919 int err;
1920 char *link_name;
1921 unsigned int bearer_id;
1922 struct tipc_link *link;
1923 struct tipc_node *node;
1924 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1925 struct net *net = sock_net(skb->sk);
1926 struct tipc_link_entry *le;
1927
1928 if (!info->attrs[TIPC_NLA_LINK])
1929 return -EINVAL;
1930
1931 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1932 info->attrs[TIPC_NLA_LINK],
1933 tipc_nl_link_policy, info->extack);
1934 if (err)
1935 return err;
1936
1937 if (!attrs[TIPC_NLA_LINK_NAME])
1938 return -EINVAL;
1939
1940 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1941
1942 if (strcmp(link_name, tipc_bclink_name) == 0) {
1943 err = tipc_bclink_reset_stats(net);
1944 if (err)
1945 return err;
1946 return 0;
1947 }
1948
1949 node = tipc_node_find_by_name(net, link_name, &bearer_id);
1950 if (!node)
1951 return -EINVAL;
1952
1953 le = &node->links[bearer_id];
1954 tipc_node_read_lock(node);
1955 spin_lock_bh(&le->lock);
1956 link = node->links[bearer_id].link;
1957 if (!link) {
1958 spin_unlock_bh(&le->lock);
1959 tipc_node_read_unlock(node);
1960 return -EINVAL;
1961 }
1962 tipc_link_reset_stats(link);
1963 spin_unlock_bh(&le->lock);
1964 tipc_node_read_unlock(node);
1965 return 0;
1966 }
1967
1968 /* Caller should hold node lock */
1969 static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
1970 struct tipc_node *node, u32 *prev_link)
1971 {
1972 u32 i;
1973 int err;
1974
1975 for (i = *prev_link; i < MAX_BEARERS; i++) {
1976 *prev_link = i;
1977
1978 if (!node->links[i].link)
1979 continue;
1980
1981 err = __tipc_nl_add_link(net, msg,
1982 node->links[i].link, NLM_F_MULTI);
1983 if (err)
1984 return err;
1985 }
1986 *prev_link = 0;
1987
1988 return 0;
1989 }
1990
1991 int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
1992 {
1993 struct net *net = sock_net(skb->sk);
1994 struct tipc_net *tn = net_generic(net, tipc_net_id);
1995 struct tipc_node *node;
1996 struct tipc_nl_msg msg;
1997 u32 prev_node = cb->args[0];
1998 u32 prev_link = cb->args[1];
1999 int done = cb->args[2];
2000 int err;
2001
2002 if (done)
2003 return 0;
2004
2005 msg.skb = skb;
2006 msg.portid = NETLINK_CB(cb->skb).portid;
2007 msg.seq = cb->nlh->nlmsg_seq;
2008
2009 rcu_read_lock();
2010 if (prev_node) {
2011 node = tipc_node_find(net, prev_node);
2012 if (!node) {
2013 /* We never set seq or call nl_dump_check_consistent()
2014 * this means that setting prev_seq here will cause the
2015 * consistence check to fail in the netlink callback
2016 * handler. Resulting in the last NLMSG_DONE message
2017 * having the NLM_F_DUMP_INTR flag set.
2018 */
2019 cb->prev_seq = 1;
2020 goto out;
2021 }
2022 tipc_node_put(node);
2023
2024 list_for_each_entry_continue_rcu(node, &tn->node_list,
2025 list) {
2026 tipc_node_read_lock(node);
2027 err = __tipc_nl_add_node_links(net, &msg, node,
2028 &prev_link);
2029 tipc_node_read_unlock(node);
2030 if (err)
2031 goto out;
2032
2033 prev_node = node->addr;
2034 }
2035 } else {
2036 err = tipc_nl_add_bc_link(net, &msg);
2037 if (err)
2038 goto out;
2039
2040 list_for_each_entry_rcu(node, &tn->node_list, list) {
2041 tipc_node_read_lock(node);
2042 err = __tipc_nl_add_node_links(net, &msg, node,
2043 &prev_link);
2044 tipc_node_read_unlock(node);
2045 if (err)
2046 goto out;
2047
2048 prev_node = node->addr;
2049 }
2050 }
2051 done = 1;
2052 out:
2053 rcu_read_unlock();
2054
2055 cb->args[0] = prev_node;
2056 cb->args[1] = prev_link;
2057 cb->args[2] = done;
2058
2059 return skb->len;
2060 }
2061
2062 int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2063 {
2064 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2065 struct net *net = sock_net(skb->sk);
2066 int err;
2067
2068 if (!info->attrs[TIPC_NLA_MON])
2069 return -EINVAL;
2070
2071 err = nla_parse_nested(attrs, TIPC_NLA_MON_MAX,
2072 info->attrs[TIPC_NLA_MON],
2073 tipc_nl_monitor_policy, info->extack);
2074 if (err)
2075 return err;
2076
2077 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2078 u32 val;
2079
2080 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2081 err = tipc_nl_monitor_set_threshold(net, val);
2082 if (err)
2083 return err;
2084 }
2085
2086 return 0;
2087 }
2088
2089 static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2090 {
2091 struct nlattr *attrs;
2092 void *hdr;
2093 u32 val;
2094
2095 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2096 0, TIPC_NL_MON_GET);
2097 if (!hdr)
2098 return -EMSGSIZE;
2099
2100 attrs = nla_nest_start(msg->skb, TIPC_NLA_MON);
2101 if (!attrs)
2102 goto msg_full;
2103
2104 val = tipc_nl_monitor_get_threshold(net);
2105
2106 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2107 goto attr_msg_full;
2108
2109 nla_nest_end(msg->skb, attrs);
2110 genlmsg_end(msg->skb, hdr);
2111
2112 return 0;
2113
2114 attr_msg_full:
2115 nla_nest_cancel(msg->skb, attrs);
2116 msg_full:
2117 genlmsg_cancel(msg->skb, hdr);
2118
2119 return -EMSGSIZE;
2120 }
2121
2122 int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2123 {
2124 struct net *net = sock_net(skb->sk);
2125 struct tipc_nl_msg msg;
2126 int err;
2127
2128 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2129 if (!msg.skb)
2130 return -ENOMEM;
2131 msg.portid = info->snd_portid;
2132 msg.seq = info->snd_seq;
2133
2134 err = __tipc_nl_add_monitor_prop(net, &msg);
2135 if (err) {
2136 nlmsg_free(msg.skb);
2137 return err;
2138 }
2139
2140 return genlmsg_reply(msg.skb, info);
2141 }
2142
2143 int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2144 {
2145 struct net *net = sock_net(skb->sk);
2146 u32 prev_bearer = cb->args[0];
2147 struct tipc_nl_msg msg;
2148 int err;
2149 int i;
2150
2151 if (prev_bearer == MAX_BEARERS)
2152 return 0;
2153
2154 msg.skb = skb;
2155 msg.portid = NETLINK_CB(cb->skb).portid;
2156 msg.seq = cb->nlh->nlmsg_seq;
2157
2158 rtnl_lock();
2159 for (i = prev_bearer; i < MAX_BEARERS; i++) {
2160 prev_bearer = i;
2161 err = __tipc_nl_add_monitor(net, &msg, prev_bearer);
2162 if (err)
2163 goto out;
2164 }
2165
2166 out:
2167 rtnl_unlock();
2168 cb->args[0] = prev_bearer;
2169
2170 return skb->len;
2171 }
2172
2173 int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2174 struct netlink_callback *cb)
2175 {
2176 struct net *net = sock_net(skb->sk);
2177 u32 prev_node = cb->args[1];
2178 u32 bearer_id = cb->args[2];
2179 int done = cb->args[0];
2180 struct tipc_nl_msg msg;
2181 int err;
2182
2183 if (!prev_node) {
2184 struct nlattr **attrs;
2185 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2186
2187 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2188 if (err)
2189 return err;
2190
2191 if (!attrs[TIPC_NLA_MON])
2192 return -EINVAL;
2193
2194 err = nla_parse_nested(mon, TIPC_NLA_MON_MAX,
2195 attrs[TIPC_NLA_MON],
2196 tipc_nl_monitor_policy, NULL);
2197 if (err)
2198 return err;
2199
2200 if (!mon[TIPC_NLA_MON_REF])
2201 return -EINVAL;
2202
2203 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2204
2205 if (bearer_id >= MAX_BEARERS)
2206 return -EINVAL;
2207 }
2208
2209 if (done)
2210 return 0;
2211
2212 msg.skb = skb;
2213 msg.portid = NETLINK_CB(cb->skb).portid;
2214 msg.seq = cb->nlh->nlmsg_seq;
2215
2216 rtnl_lock();
2217 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2218 if (!err)
2219 done = 1;
2220
2221 rtnl_unlock();
2222 cb->args[0] = done;
2223 cb->args[1] = prev_node;
2224 cb->args[2] = bearer_id;
2225
2226 return skb->len;
2227 }
CRIS linux kernel tree