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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 */
54enum {
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
61struct 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
69struct 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 */
100struct 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 */
127enum {
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
138enum {
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
149static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
150 struct sk_buff_head *xmitq,
151 struct tipc_media_addr **maddr);
152static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
153 bool delete);
154static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
155static void tipc_node_delete(struct tipc_node *node);
156static void tipc_node_timeout(unsigned long data);
157static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
158static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
159static void tipc_node_put(struct tipc_node *node);
160static bool tipc_node_is_up(struct tipc_node *n);
161
162struct tipc_sock_conn {
163 u32 port;
164 u32 peer_port;
165 u32 peer_node;
166 struct list_head list;
167};
168
169static 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
179int 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
196u16 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
209static 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
217static void tipc_node_put(struct tipc_node *node)
218{
219 kref_put(&node->kref, tipc_node_kref_release);
220}
221
222static 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 */
230static 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
251static void tipc_node_read_lock(struct tipc_node *n)
252{
253 read_lock_bh(&n->lock);
254}
255
256static void tipc_node_read_unlock(struct tipc_node *n)
257{
258 read_unlock_bh(&n->lock);
259}
260
261static void tipc_node_write_lock(struct tipc_node *n)
262{
263 write_lock_bh(&n->lock);
264}
265
266static void tipc_node_write_unlock_fast(struct tipc_node *n)
267{
268 write_unlock_bh(&n->lock);
269}
270
271static 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
313struct 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);
372exit:
373 spin_unlock_bh(&tn->node_list_lock);
374 return n;
375}
376
377static 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
390static 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
400void 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
411void 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
429void 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
447int 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);
473exit:
474 tipc_node_put(node);
475 return err;
476}
477
478void 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 */
503static 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 */
536static 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 */
601static 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 */
616static 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
688static 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
720static bool tipc_node_is_up(struct tipc_node *n)
721{
722 return n->active_links[0] != INVALID_BEARER_ID;
723}
724
725void 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));
853exit:
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
860void 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
872static 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 */
888static 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
1058illegal_evt:
1059 pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
1060}
1061
1062static 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 */
1110int 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 }
1129exit:
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 */
1136static 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
1161attr_msg_full:
1162 nla_nest_cancel(msg->skb, attrs);
1163msg_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, except when returning -ELINKCONG
1176 * Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
1177 */
1178int 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 (likely(rc == 0))
1215 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1216 else if (rc == -ENOBUFS)
1217 tipc_node_link_down(n, bearer_id, false);
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 * TODO: Return real return value, and let callers use
1230 * tipc_wait_for_sendpkt() where applicable
1231 */
1232int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
1233 u32 selector)
1234{
1235 struct sk_buff_head head;
1236 int rc;
1237
1238 skb_queue_head_init(&head);
1239 __skb_queue_tail(&head, skb);
1240 rc = tipc_node_xmit(net, &head, dnode, selector);
1241 if (rc == -ELINKCONG)
1242 kfree_skb(skb);
1243 return 0;
1244}
1245
1246void tipc_node_broadcast(struct net *net, struct sk_buff *skb)
1247{
1248 struct sk_buff *txskb;
1249 struct tipc_node *n;
1250 u32 dst;
1251
1252 rcu_read_lock();
1253 list_for_each_entry_rcu(n, tipc_nodes(net), list) {
1254 dst = n->addr;
1255 if (in_own_node(net, dst))
1256 continue;
1257 if (!tipc_node_is_up(n))
1258 continue;
1259 txskb = pskb_copy(skb, GFP_ATOMIC);
1260 if (!txskb)
1261 break;
1262 msg_set_destnode(buf_msg(txskb), dst);
1263 tipc_node_xmit_skb(net, txskb, dst, 0);
1264 }
1265 rcu_read_unlock();
1266
1267 kfree_skb(skb);
1268}
1269
1270static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
1271 int bearer_id, struct sk_buff_head *xmitq)
1272{
1273 struct tipc_link *ucl;
1274 int rc;
1275
1276 rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr);
1277
1278 if (rc & TIPC_LINK_DOWN_EVT) {
1279 tipc_bearer_reset_all(n->net);
1280 return;
1281 }
1282
1283 if (!(rc & TIPC_LINK_SND_STATE))
1284 return;
1285
1286 /* If probe message, a STATE response will be sent anyway */
1287 if (msg_probe(hdr))
1288 return;
1289
1290 /* Produce a STATE message carrying broadcast NACK */
1291 tipc_node_read_lock(n);
1292 ucl = n->links[bearer_id].link;
1293 if (ucl)
1294 tipc_link_build_state_msg(ucl, xmitq);
1295 tipc_node_read_unlock(n);
1296}
1297
1298/**
1299 * tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
1300 * @net: the applicable net namespace
1301 * @skb: TIPC packet
1302 * @bearer_id: id of bearer message arrived on
1303 *
1304 * Invoked with no locks held.
1305 */
1306static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
1307{
1308 int rc;
1309 struct sk_buff_head xmitq;
1310 struct tipc_bclink_entry *be;
1311 struct tipc_link_entry *le;
1312 struct tipc_msg *hdr = buf_msg(skb);
1313 int usr = msg_user(hdr);
1314 u32 dnode = msg_destnode(hdr);
1315 struct tipc_node *n;
1316
1317 __skb_queue_head_init(&xmitq);
1318
1319 /* If NACK for other node, let rcv link for that node peek into it */
1320 if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
1321 n = tipc_node_find(net, dnode);
1322 else
1323 n = tipc_node_find(net, msg_prevnode(hdr));
1324 if (!n) {
1325 kfree_skb(skb);
1326 return;
1327 }
1328 be = &n->bc_entry;
1329 le = &n->links[bearer_id];
1330
1331 rc = tipc_bcast_rcv(net, be->link, skb);
1332
1333 /* Broadcast ACKs are sent on a unicast link */
1334 if (rc & TIPC_LINK_SND_STATE) {
1335 tipc_node_read_lock(n);
1336 tipc_link_build_state_msg(le->link, &xmitq);
1337 tipc_node_read_unlock(n);
1338 }
1339
1340 if (!skb_queue_empty(&xmitq))
1341 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1342
1343 /* Deliver. 'arrvq' is under inputq2's lock protection */
1344 if (!skb_queue_empty(&be->inputq1)) {
1345 spin_lock_bh(&be->inputq2.lock);
1346 spin_lock_bh(&be->inputq1.lock);
1347 skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
1348 spin_unlock_bh(&be->inputq1.lock);
1349 spin_unlock_bh(&be->inputq2.lock);
1350 tipc_sk_mcast_rcv(net, &be->arrvq, &be->inputq2);
1351 }
1352
1353 if (rc & TIPC_LINK_DOWN_EVT) {
1354 /* Reception reassembly failure => reset all links to peer */
1355 if (!tipc_link_is_up(be->link))
1356 tipc_node_reset_links(n);
1357
1358 /* Retransmission failure => reset all links to all peers */
1359 if (!tipc_link_is_up(tipc_bc_sndlink(net)))
1360 tipc_bearer_reset_all(net);
1361 }
1362
1363 tipc_node_put(n);
1364}
1365
1366/**
1367 * tipc_node_check_state - check and if necessary update node state
1368 * @skb: TIPC packet
1369 * @bearer_id: identity of bearer delivering the packet
1370 * Returns true if state is ok, otherwise consumes buffer and returns false
1371 */
1372static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
1373 int bearer_id, struct sk_buff_head *xmitq)
1374{
1375 struct tipc_msg *hdr = buf_msg(skb);
1376 int usr = msg_user(hdr);
1377 int mtyp = msg_type(hdr);
1378 u16 oseqno = msg_seqno(hdr);
1379 u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
1380 u16 exp_pkts = msg_msgcnt(hdr);
1381 u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
1382 int state = n->state;
1383 struct tipc_link *l, *tnl, *pl = NULL;
1384 struct tipc_media_addr *maddr;
1385 int pb_id;
1386
1387 l = n->links[bearer_id].link;
1388 if (!l)
1389 return false;
1390 rcv_nxt = tipc_link_rcv_nxt(l);
1391
1392
1393 if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
1394 return true;
1395
1396 /* Find parallel link, if any */
1397 for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
1398 if ((pb_id != bearer_id) && n->links[pb_id].link) {
1399 pl = n->links[pb_id].link;
1400 break;
1401 }
1402 }
1403
1404 /* Check and update node accesibility if applicable */
1405 if (state == SELF_UP_PEER_COMING) {
1406 if (!tipc_link_is_up(l))
1407 return true;
1408 if (!msg_peer_link_is_up(hdr))
1409 return true;
1410 tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
1411 }
1412
1413 if (state == SELF_DOWN_PEER_LEAVING) {
1414 if (msg_peer_node_is_up(hdr))
1415 return false;
1416 tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
1417 return true;
1418 }
1419
1420 if (state == SELF_LEAVING_PEER_DOWN)
1421 return false;
1422
1423 /* Ignore duplicate packets */
1424 if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
1425 return true;
1426
1427 /* Initiate or update failover mode if applicable */
1428 if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
1429 syncpt = oseqno + exp_pkts - 1;
1430 if (pl && tipc_link_is_up(pl)) {
1431 __tipc_node_link_down(n, &pb_id, xmitq, &maddr);
1432 tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
1433 tipc_link_inputq(l));
1434 }
1435 /* If pkts arrive out of order, use lowest calculated syncpt */
1436 if (less(syncpt, n->sync_point))
1437 n->sync_point = syncpt;
1438 }
1439
1440 /* Open parallel link when tunnel link reaches synch point */
1441 if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
1442 if (!more(rcv_nxt, n->sync_point))
1443 return true;
1444 tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
1445 if (pl)
1446 tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
1447 return true;
1448 }
1449
1450 /* No synching needed if only one link */
1451 if (!pl || !tipc_link_is_up(pl))
1452 return true;
1453
1454 /* Initiate synch mode if applicable */
1455 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
1456 syncpt = iseqno + exp_pkts - 1;
1457 if (!tipc_link_is_up(l)) {
1458 tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
1459 __tipc_node_link_up(n, bearer_id, xmitq);
1460 }
1461 if (n->state == SELF_UP_PEER_UP) {
1462 n->sync_point = syncpt;
1463 tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
1464 tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
1465 }
1466 }
1467
1468 /* Open tunnel link when parallel link reaches synch point */
1469 if (n->state == NODE_SYNCHING) {
1470 if (tipc_link_is_synching(l)) {
1471 tnl = l;
1472 } else {
1473 tnl = pl;
1474 pl = l;
1475 }
1476 inputq_len = skb_queue_len(tipc_link_inputq(pl));
1477 dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
1478 if (more(dlv_nxt, n->sync_point)) {
1479 tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
1480 tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
1481 return true;
1482 }
1483 if (l == pl)
1484 return true;
1485 if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
1486 return true;
1487 if (usr == LINK_PROTOCOL)
1488 return true;
1489 return false;
1490 }
1491 return true;
1492}
1493
1494/**
1495 * tipc_rcv - process TIPC packets/messages arriving from off-node
1496 * @net: the applicable net namespace
1497 * @skb: TIPC packet
1498 * @bearer: pointer to bearer message arrived on
1499 *
1500 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1501 * structure (i.e. cannot be NULL), but bearer can be inactive.
1502 */
1503void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
1504{
1505 struct sk_buff_head xmitq;
1506 struct tipc_node *n;
1507 struct tipc_msg *hdr = buf_msg(skb);
1508 int usr = msg_user(hdr);
1509 int bearer_id = b->identity;
1510 struct tipc_link_entry *le;
1511 u16 bc_ack = msg_bcast_ack(hdr);
1512 u32 self = tipc_own_addr(net);
1513 int rc = 0;
1514
1515 __skb_queue_head_init(&xmitq);
1516
1517 /* Ensure message is well-formed */
1518 if (unlikely(!tipc_msg_validate(skb)))
1519 goto discard;
1520
1521 /* Handle arrival of discovery or broadcast packet */
1522 if (unlikely(msg_non_seq(hdr))) {
1523 if (unlikely(usr == LINK_CONFIG))
1524 return tipc_disc_rcv(net, skb, b);
1525 else
1526 return tipc_node_bc_rcv(net, skb, bearer_id);
1527 }
1528
1529 /* Discard unicast link messages destined for another node */
1530 if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
1531 goto discard;
1532
1533 /* Locate neighboring node that sent packet */
1534 n = tipc_node_find(net, msg_prevnode(hdr));
1535 if (unlikely(!n))
1536 goto discard;
1537 le = &n->links[bearer_id];
1538
1539 /* Ensure broadcast reception is in synch with peer's send state */
1540 if (unlikely(usr == LINK_PROTOCOL))
1541 tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
1542 else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack))
1543 tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
1544
1545 /* Receive packet directly if conditions permit */
1546 tipc_node_read_lock(n);
1547 if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
1548 spin_lock_bh(&le->lock);
1549 if (le->link) {
1550 rc = tipc_link_rcv(le->link, skb, &xmitq);
1551 skb = NULL;
1552 }
1553 spin_unlock_bh(&le->lock);
1554 }
1555 tipc_node_read_unlock(n);
1556
1557 /* Check/update node state before receiving */
1558 if (unlikely(skb)) {
1559 tipc_node_write_lock(n);
1560 if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
1561 if (le->link) {
1562 rc = tipc_link_rcv(le->link, skb, &xmitq);
1563 skb = NULL;
1564 }
1565 }
1566 tipc_node_write_unlock(n);
1567 }
1568
1569 if (unlikely(rc & TIPC_LINK_UP_EVT))
1570 tipc_node_link_up(n, bearer_id, &xmitq);
1571
1572 if (unlikely(rc & TIPC_LINK_DOWN_EVT))
1573 tipc_node_link_down(n, bearer_id, false);
1574
1575 if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
1576 tipc_named_rcv(net, &n->bc_entry.namedq);
1577
1578 if (!skb_queue_empty(&le->inputq))
1579 tipc_sk_rcv(net, &le->inputq);
1580
1581 if (!skb_queue_empty(&xmitq))
1582 tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
1583
1584 tipc_node_put(n);
1585discard:
1586 kfree_skb(skb);
1587}
1588
1589int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
1590{
1591 struct net *net = sock_net(skb->sk);
1592 struct tipc_net *tn = net_generic(net, tipc_net_id);
1593 struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
1594 struct tipc_node *peer;
1595 u32 addr;
1596 int err;
1597 int i;
1598
1599 /* We identify the peer by its net */
1600 if (!info->attrs[TIPC_NLA_NET])
1601 return -EINVAL;
1602
1603 err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
1604 info->attrs[TIPC_NLA_NET],
1605 tipc_nl_net_policy);
1606 if (err)
1607 return err;
1608
1609 if (!attrs[TIPC_NLA_NET_ADDR])
1610 return -EINVAL;
1611
1612 addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
1613
1614 if (in_own_node(net, addr))
1615 return -ENOTSUPP;
1616
1617 spin_lock_bh(&tn->node_list_lock);
1618 peer = tipc_node_find(net, addr);
1619 if (!peer) {
1620 spin_unlock_bh(&tn->node_list_lock);
1621 return -ENXIO;
1622 }
1623
1624 tipc_node_write_lock(peer);
1625 if (peer->state != SELF_DOWN_PEER_DOWN &&
1626 peer->state != SELF_DOWN_PEER_LEAVING) {
1627 tipc_node_write_unlock(peer);
1628 err = -EBUSY;
1629 goto err_out;
1630 }
1631
1632 for (i = 0; i < MAX_BEARERS; i++) {
1633 struct tipc_link_entry *le = &peer->links[i];
1634
1635 if (le->link) {
1636 kfree(le->link);
1637 le->link = NULL;
1638 peer->link_cnt--;
1639 }
1640 }
1641 tipc_node_write_unlock(peer);
1642 tipc_node_delete(peer);
1643
1644 err = 0;
1645err_out:
1646 tipc_node_put(peer);
1647 spin_unlock_bh(&tn->node_list_lock);
1648
1649 return err;
1650}
1651
1652int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
1653{
1654 int err;
1655 struct net *net = sock_net(skb->sk);
1656 struct tipc_net *tn = net_generic(net, tipc_net_id);
1657 int done = cb->args[0];
1658 int last_addr = cb->args[1];
1659 struct tipc_node *node;
1660 struct tipc_nl_msg msg;
1661
1662 if (done)
1663 return 0;
1664
1665 msg.skb = skb;
1666 msg.portid = NETLINK_CB(cb->skb).portid;
1667 msg.seq = cb->nlh->nlmsg_seq;
1668
1669 rcu_read_lock();
1670 if (last_addr) {
1671 node = tipc_node_find(net, last_addr);
1672 if (!node) {
1673 rcu_read_unlock();
1674 /* We never set seq or call nl_dump_check_consistent()
1675 * this means that setting prev_seq here will cause the
1676 * consistence check to fail in the netlink callback
1677 * handler. Resulting in the NLMSG_DONE message having
1678 * the NLM_F_DUMP_INTR flag set if the node state
1679 * changed while we released the lock.
1680 */
1681 cb->prev_seq = 1;
1682 return -EPIPE;
1683 }
1684 tipc_node_put(node);
1685 }
1686
1687 list_for_each_entry_rcu(node, &tn->node_list, list) {
1688 if (last_addr) {
1689 if (node->addr == last_addr)
1690 last_addr = 0;
1691 else
1692 continue;
1693 }
1694
1695 tipc_node_read_lock(node);
1696 err = __tipc_nl_add_node(&msg, node);
1697 if (err) {
1698 last_addr = node->addr;
1699 tipc_node_read_unlock(node);
1700 goto out;
1701 }
1702
1703 tipc_node_read_unlock(node);
1704 }
1705 done = 1;
1706out:
1707 cb->args[0] = done;
1708 cb->args[1] = last_addr;
1709 rcu_read_unlock();
1710
1711 return skb->len;
1712}
1713
1714/* tipc_node_find_by_name - locate owner node of link by link's name
1715 * @net: the applicable net namespace
1716 * @name: pointer to link name string
1717 * @bearer_id: pointer to index in 'node->links' array where the link was found.
1718 *
1719 * Returns pointer to node owning the link, or 0 if no matching link is found.
1720 */
1721static struct tipc_node *tipc_node_find_by_name(struct net *net,
1722 const char *link_name,
1723 unsigned int *bearer_id)
1724{
1725 struct tipc_net *tn = net_generic(net, tipc_net_id);
1726 struct tipc_link *l;
1727 struct tipc_node *n;
1728 struct tipc_node *found_node = NULL;
1729 int i;
1730
1731 *bearer_id = 0;
1732 rcu_read_lock();
1733 list_for_each_entry_rcu(n, &tn->node_list, list) {
1734 tipc_node_read_lock(n);
1735 for (i = 0; i < MAX_BEARERS; i++) {
1736 l = n->links[i].link;
1737 if (l && !strcmp(tipc_link_name(l), link_name)) {
1738 *bearer_id = i;
1739 found_node = n;
1740 break;
1741 }
1742 }
1743 tipc_node_read_unlock(n);
1744 if (found_node)
1745 break;
1746 }
1747 rcu_read_unlock();
1748
1749 return found_node;
1750}
1751
1752int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
1753{
1754 int err;
1755 int res = 0;
1756 int bearer_id;
1757 char *name;
1758 struct tipc_link *link;
1759 struct tipc_node *node;
1760 struct sk_buff_head xmitq;
1761 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1762 struct net *net = sock_net(skb->sk);
1763
1764 __skb_queue_head_init(&xmitq);
1765
1766 if (!info->attrs[TIPC_NLA_LINK])
1767 return -EINVAL;
1768
1769 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1770 info->attrs[TIPC_NLA_LINK],
1771 tipc_nl_link_policy);
1772 if (err)
1773 return err;
1774
1775 if (!attrs[TIPC_NLA_LINK_NAME])
1776 return -EINVAL;
1777
1778 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1779
1780 if (strcmp(name, tipc_bclink_name) == 0)
1781 return tipc_nl_bc_link_set(net, attrs);
1782
1783 node = tipc_node_find_by_name(net, name, &bearer_id);
1784 if (!node)
1785 return -EINVAL;
1786
1787 tipc_node_read_lock(node);
1788
1789 link = node->links[bearer_id].link;
1790 if (!link) {
1791 res = -EINVAL;
1792 goto out;
1793 }
1794
1795 if (attrs[TIPC_NLA_LINK_PROP]) {
1796 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1797
1798 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
1799 props);
1800 if (err) {
1801 res = err;
1802 goto out;
1803 }
1804
1805 if (props[TIPC_NLA_PROP_TOL]) {
1806 u32 tol;
1807
1808 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1809 tipc_link_set_tolerance(link, tol, &xmitq);
1810 }
1811 if (props[TIPC_NLA_PROP_PRIO]) {
1812 u32 prio;
1813
1814 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1815 tipc_link_set_prio(link, prio, &xmitq);
1816 }
1817 if (props[TIPC_NLA_PROP_WIN]) {
1818 u32 win;
1819
1820 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1821 tipc_link_set_queue_limits(link, win);
1822 }
1823 }
1824
1825out:
1826 tipc_node_read_unlock(node);
1827 tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr);
1828 return res;
1829}
1830
1831int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
1832{
1833 struct net *net = genl_info_net(info);
1834 struct tipc_nl_msg msg;
1835 char *name;
1836 int err;
1837
1838 msg.portid = info->snd_portid;
1839 msg.seq = info->snd_seq;
1840
1841 if (!info->attrs[TIPC_NLA_LINK_NAME])
1842 return -EINVAL;
1843 name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
1844
1845 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1846 if (!msg.skb)
1847 return -ENOMEM;
1848
1849 if (strcmp(name, tipc_bclink_name) == 0) {
1850 err = tipc_nl_add_bc_link(net, &msg);
1851 if (err) {
1852 nlmsg_free(msg.skb);
1853 return err;
1854 }
1855 } else {
1856 int bearer_id;
1857 struct tipc_node *node;
1858 struct tipc_link *link;
1859
1860 node = tipc_node_find_by_name(net, name, &bearer_id);
1861 if (!node)
1862 return -EINVAL;
1863
1864 tipc_node_read_lock(node);
1865 link = node->links[bearer_id].link;
1866 if (!link) {
1867 tipc_node_read_unlock(node);
1868 nlmsg_free(msg.skb);
1869 return -EINVAL;
1870 }
1871
1872 err = __tipc_nl_add_link(net, &msg, link, 0);
1873 tipc_node_read_unlock(node);
1874 if (err) {
1875 nlmsg_free(msg.skb);
1876 return err;
1877 }
1878 }
1879
1880 return genlmsg_reply(msg.skb, info);
1881}
1882
1883int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
1884{
1885 int err;
1886 char *link_name;
1887 unsigned int bearer_id;
1888 struct tipc_link *link;
1889 struct tipc_node *node;
1890 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
1891 struct net *net = sock_net(skb->sk);
1892 struct tipc_link_entry *le;
1893
1894 if (!info->attrs[TIPC_NLA_LINK])
1895 return -EINVAL;
1896
1897 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
1898 info->attrs[TIPC_NLA_LINK],
1899 tipc_nl_link_policy);
1900 if (err)
1901 return err;
1902
1903 if (!attrs[TIPC_NLA_LINK_NAME])
1904 return -EINVAL;
1905
1906 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
1907
1908 if (strcmp(link_name, tipc_bclink_name) == 0) {
1909 err = tipc_bclink_reset_stats(net);
1910 if (err)
1911 return err;
1912 return 0;
1913 }
1914
1915 node = tipc_node_find_by_name(net, link_name, &bearer_id);
1916 if (!node)
1917 return -EINVAL;
1918
1919 le = &node->links[bearer_id];
1920 tipc_node_read_lock(node);
1921 spin_lock_bh(&le->lock);
1922 link = node->links[bearer_id].link;
1923 if (!link) {
1924 spin_unlock_bh(&le->lock);
1925 tipc_node_read_unlock(node);
1926 return -EINVAL;
1927 }
1928 tipc_link_reset_stats(link);
1929 spin_unlock_bh(&le->lock);
1930 tipc_node_read_unlock(node);
1931 return 0;
1932}
1933
1934/* Caller should hold node lock */
1935static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
1936 struct tipc_node *node, u32 *prev_link)
1937{
1938 u32 i;
1939 int err;
1940
1941 for (i = *prev_link; i < MAX_BEARERS; i++) {
1942 *prev_link = i;
1943
1944 if (!node->links[i].link)
1945 continue;
1946
1947 err = __tipc_nl_add_link(net, msg,
1948 node->links[i].link, NLM_F_MULTI);
1949 if (err)
1950 return err;
1951 }
1952 *prev_link = 0;
1953
1954 return 0;
1955}
1956
1957int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
1958{
1959 struct net *net = sock_net(skb->sk);
1960 struct tipc_net *tn = net_generic(net, tipc_net_id);
1961 struct tipc_node *node;
1962 struct tipc_nl_msg msg;
1963 u32 prev_node = cb->args[0];
1964 u32 prev_link = cb->args[1];
1965 int done = cb->args[2];
1966 int err;
1967
1968 if (done)
1969 return 0;
1970
1971 msg.skb = skb;
1972 msg.portid = NETLINK_CB(cb->skb).portid;
1973 msg.seq = cb->nlh->nlmsg_seq;
1974
1975 rcu_read_lock();
1976 if (prev_node) {
1977 node = tipc_node_find(net, prev_node);
1978 if (!node) {
1979 /* We never set seq or call nl_dump_check_consistent()
1980 * this means that setting prev_seq here will cause the
1981 * consistence check to fail in the netlink callback
1982 * handler. Resulting in the last NLMSG_DONE message
1983 * having the NLM_F_DUMP_INTR flag set.
1984 */
1985 cb->prev_seq = 1;
1986 goto out;
1987 }
1988 tipc_node_put(node);
1989
1990 list_for_each_entry_continue_rcu(node, &tn->node_list,
1991 list) {
1992 tipc_node_read_lock(node);
1993 err = __tipc_nl_add_node_links(net, &msg, node,
1994 &prev_link);
1995 tipc_node_read_unlock(node);
1996 if (err)
1997 goto out;
1998
1999 prev_node = node->addr;
2000 }
2001 } else {
2002 err = tipc_nl_add_bc_link(net, &msg);
2003 if (err)
2004 goto out;
2005
2006 list_for_each_entry_rcu(node, &tn->node_list, list) {
2007 tipc_node_read_lock(node);
2008 err = __tipc_nl_add_node_links(net, &msg, node,
2009 &prev_link);
2010 tipc_node_read_unlock(node);
2011 if (err)
2012 goto out;
2013
2014 prev_node = node->addr;
2015 }
2016 }
2017 done = 1;
2018out:
2019 rcu_read_unlock();
2020
2021 cb->args[0] = prev_node;
2022 cb->args[1] = prev_link;
2023 cb->args[2] = done;
2024
2025 return skb->len;
2026}
2027
2028int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
2029{
2030 struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
2031 struct net *net = sock_net(skb->sk);
2032 int err;
2033
2034 if (!info->attrs[TIPC_NLA_MON])
2035 return -EINVAL;
2036
2037 err = nla_parse_nested(attrs, TIPC_NLA_MON_MAX,
2038 info->attrs[TIPC_NLA_MON],
2039 tipc_nl_monitor_policy);
2040 if (err)
2041 return err;
2042
2043 if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
2044 u32 val;
2045
2046 val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
2047 err = tipc_nl_monitor_set_threshold(net, val);
2048 if (err)
2049 return err;
2050 }
2051
2052 return 0;
2053}
2054
2055static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
2056{
2057 struct nlattr *attrs;
2058 void *hdr;
2059 u32 val;
2060
2061 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2062 0, TIPC_NL_MON_GET);
2063 if (!hdr)
2064 return -EMSGSIZE;
2065
2066 attrs = nla_nest_start(msg->skb, TIPC_NLA_MON);
2067 if (!attrs)
2068 goto msg_full;
2069
2070 val = tipc_nl_monitor_get_threshold(net);
2071
2072 if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
2073 goto attr_msg_full;
2074
2075 nla_nest_end(msg->skb, attrs);
2076 genlmsg_end(msg->skb, hdr);
2077
2078 return 0;
2079
2080attr_msg_full:
2081 nla_nest_cancel(msg->skb, attrs);
2082msg_full:
2083 genlmsg_cancel(msg->skb, hdr);
2084
2085 return -EMSGSIZE;
2086}
2087
2088int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
2089{
2090 struct net *net = sock_net(skb->sk);
2091 struct tipc_nl_msg msg;
2092 int err;
2093
2094 msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2095 msg.portid = info->snd_portid;
2096 msg.seq = info->snd_seq;
2097
2098 err = __tipc_nl_add_monitor_prop(net, &msg);
2099 if (err) {
2100 nlmsg_free(msg.skb);
2101 return err;
2102 }
2103
2104 return genlmsg_reply(msg.skb, info);
2105}
2106
2107int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
2108{
2109 struct net *net = sock_net(skb->sk);
2110 u32 prev_bearer = cb->args[0];
2111 struct tipc_nl_msg msg;
2112 int err;
2113 int i;
2114
2115 if (prev_bearer == MAX_BEARERS)
2116 return 0;
2117
2118 msg.skb = skb;
2119 msg.portid = NETLINK_CB(cb->skb).portid;
2120 msg.seq = cb->nlh->nlmsg_seq;
2121
2122 rtnl_lock();
2123 for (i = prev_bearer; i < MAX_BEARERS; i++) {
2124 prev_bearer = i;
2125 err = __tipc_nl_add_monitor(net, &msg, prev_bearer);
2126 if (err)
2127 goto out;
2128 }
2129
2130out:
2131 rtnl_unlock();
2132 cb->args[0] = prev_bearer;
2133
2134 return skb->len;
2135}
2136
2137int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
2138 struct netlink_callback *cb)
2139{
2140 struct net *net = sock_net(skb->sk);
2141 u32 prev_node = cb->args[1];
2142 u32 bearer_id = cb->args[2];
2143 int done = cb->args[0];
2144 struct tipc_nl_msg msg;
2145 int err;
2146
2147 if (!prev_node) {
2148 struct nlattr **attrs;
2149 struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
2150
2151 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2152 if (err)
2153 return err;
2154
2155 if (!attrs[TIPC_NLA_MON])
2156 return -EINVAL;
2157
2158 err = nla_parse_nested(mon, TIPC_NLA_MON_MAX,
2159 attrs[TIPC_NLA_MON],
2160 tipc_nl_monitor_policy);
2161 if (err)
2162 return err;
2163
2164 if (!mon[TIPC_NLA_MON_REF])
2165 return -EINVAL;
2166
2167 bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
2168
2169 if (bearer_id >= MAX_BEARERS)
2170 return -EINVAL;
2171 }
2172
2173 if (done)
2174 return 0;
2175
2176 msg.skb = skb;
2177 msg.portid = NETLINK_CB(cb->skb).portid;
2178 msg.seq = cb->nlh->nlmsg_seq;
2179
2180 rtnl_lock();
2181 err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
2182 if (!err)
2183 done = 1;
2184
2185 rtnl_unlock();
2186 cb->args[0] = done;
2187 cb->args[1] = prev_node;
2188 cb->args[2] = bearer_id;
2189
2190 return skb->len;
2191}
1/*
2 * net/tipc/node.c: TIPC node management routines
3 *
4 * Copyright (c) 2000-2006, 2012 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 "config.h"
39#include "node.h"
40#include "name_distr.h"
41
42#define NODE_HTABLE_SIZE 512
43
44static void node_lost_contact(struct tipc_node *n_ptr);
45static void node_established_contact(struct tipc_node *n_ptr);
46
47static struct hlist_head node_htable[NODE_HTABLE_SIZE];
48LIST_HEAD(tipc_node_list);
49static u32 tipc_num_nodes;
50static u32 tipc_num_links;
51static DEFINE_SPINLOCK(node_list_lock);
52
53/*
54 * A trivial power-of-two bitmask technique is used for speed, since this
55 * operation is done for every incoming TIPC packet. The number of hash table
56 * entries has been chosen so that no hash chain exceeds 8 nodes and will
57 * usually be much smaller (typically only a single node).
58 */
59static unsigned int tipc_hashfn(u32 addr)
60{
61 return addr & (NODE_HTABLE_SIZE - 1);
62}
63
64/*
65 * tipc_node_find - locate specified node object, if it exists
66 */
67struct tipc_node *tipc_node_find(u32 addr)
68{
69 struct tipc_node *node;
70
71 if (unlikely(!in_own_cluster_exact(addr)))
72 return NULL;
73
74 rcu_read_lock();
75 hlist_for_each_entry_rcu(node, &node_htable[tipc_hashfn(addr)], hash) {
76 if (node->addr == addr) {
77 rcu_read_unlock();
78 return node;
79 }
80 }
81 rcu_read_unlock();
82 return NULL;
83}
84
85struct tipc_node *tipc_node_create(u32 addr)
86{
87 struct tipc_node *n_ptr, *temp_node;
88
89 spin_lock_bh(&node_list_lock);
90
91 n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
92 if (!n_ptr) {
93 spin_unlock_bh(&node_list_lock);
94 pr_warn("Node creation failed, no memory\n");
95 return NULL;
96 }
97
98 n_ptr->addr = addr;
99 spin_lock_init(&n_ptr->lock);
100 INIT_HLIST_NODE(&n_ptr->hash);
101 INIT_LIST_HEAD(&n_ptr->list);
102 INIT_LIST_HEAD(&n_ptr->nsub);
103
104 hlist_add_head_rcu(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
105
106 list_for_each_entry_rcu(temp_node, &tipc_node_list, list) {
107 if (n_ptr->addr < temp_node->addr)
108 break;
109 }
110 list_add_tail_rcu(&n_ptr->list, &temp_node->list);
111 n_ptr->block_setup = WAIT_PEER_DOWN;
112 n_ptr->signature = INVALID_NODE_SIG;
113
114 tipc_num_nodes++;
115
116 spin_unlock_bh(&node_list_lock);
117 return n_ptr;
118}
119
120static void tipc_node_delete(struct tipc_node *n_ptr)
121{
122 list_del_rcu(&n_ptr->list);
123 hlist_del_rcu(&n_ptr->hash);
124 kfree_rcu(n_ptr, rcu);
125
126 tipc_num_nodes--;
127}
128
129void tipc_node_stop(void)
130{
131 struct tipc_node *node, *t_node;
132
133 spin_lock_bh(&node_list_lock);
134 list_for_each_entry_safe(node, t_node, &tipc_node_list, list)
135 tipc_node_delete(node);
136 spin_unlock_bh(&node_list_lock);
137}
138
139/**
140 * tipc_node_link_up - handle addition of link
141 *
142 * Link becomes active (alone or shared) or standby, depending on its priority.
143 */
144void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
145{
146 struct tipc_link **active = &n_ptr->active_links[0];
147
148 n_ptr->working_links++;
149
150 pr_info("Established link <%s> on network plane %c\n",
151 l_ptr->name, l_ptr->b_ptr->net_plane);
152
153 if (!active[0]) {
154 active[0] = active[1] = l_ptr;
155 node_established_contact(n_ptr);
156 return;
157 }
158 if (l_ptr->priority < active[0]->priority) {
159 pr_info("New link <%s> becomes standby\n", l_ptr->name);
160 return;
161 }
162 tipc_link_dup_queue_xmit(active[0], l_ptr);
163 if (l_ptr->priority == active[0]->priority) {
164 active[0] = l_ptr;
165 return;
166 }
167 pr_info("Old link <%s> becomes standby\n", active[0]->name);
168 if (active[1] != active[0])
169 pr_info("Old link <%s> becomes standby\n", active[1]->name);
170 active[0] = active[1] = l_ptr;
171}
172
173/**
174 * node_select_active_links - select active link
175 */
176static void node_select_active_links(struct tipc_node *n_ptr)
177{
178 struct tipc_link **active = &n_ptr->active_links[0];
179 u32 i;
180 u32 highest_prio = 0;
181
182 active[0] = active[1] = NULL;
183
184 for (i = 0; i < MAX_BEARERS; i++) {
185 struct tipc_link *l_ptr = n_ptr->links[i];
186
187 if (!l_ptr || !tipc_link_is_up(l_ptr) ||
188 (l_ptr->priority < highest_prio))
189 continue;
190
191 if (l_ptr->priority > highest_prio) {
192 highest_prio = l_ptr->priority;
193 active[0] = active[1] = l_ptr;
194 } else {
195 active[1] = l_ptr;
196 }
197 }
198}
199
200/**
201 * tipc_node_link_down - handle loss of link
202 */
203void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
204{
205 struct tipc_link **active;
206
207 n_ptr->working_links--;
208
209 if (!tipc_link_is_active(l_ptr)) {
210 pr_info("Lost standby link <%s> on network plane %c\n",
211 l_ptr->name, l_ptr->b_ptr->net_plane);
212 return;
213 }
214 pr_info("Lost link <%s> on network plane %c\n",
215 l_ptr->name, l_ptr->b_ptr->net_plane);
216
217 active = &n_ptr->active_links[0];
218 if (active[0] == l_ptr)
219 active[0] = active[1];
220 if (active[1] == l_ptr)
221 active[1] = active[0];
222 if (active[0] == l_ptr)
223 node_select_active_links(n_ptr);
224 if (tipc_node_is_up(n_ptr))
225 tipc_link_failover_send_queue(l_ptr);
226 else
227 node_lost_contact(n_ptr);
228}
229
230int tipc_node_active_links(struct tipc_node *n_ptr)
231{
232 return n_ptr->active_links[0] != NULL;
233}
234
235int tipc_node_is_up(struct tipc_node *n_ptr)
236{
237 return tipc_node_active_links(n_ptr);
238}
239
240void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
241{
242 n_ptr->links[l_ptr->b_ptr->identity] = l_ptr;
243 spin_lock_bh(&node_list_lock);
244 tipc_num_links++;
245 spin_unlock_bh(&node_list_lock);
246 n_ptr->link_cnt++;
247}
248
249void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
250{
251 int i;
252
253 for (i = 0; i < MAX_BEARERS; i++) {
254 if (l_ptr != n_ptr->links[i])
255 continue;
256 n_ptr->links[i] = NULL;
257 spin_lock_bh(&node_list_lock);
258 tipc_num_links--;
259 spin_unlock_bh(&node_list_lock);
260 n_ptr->link_cnt--;
261 }
262}
263
264static void node_established_contact(struct tipc_node *n_ptr)
265{
266 tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr);
267 n_ptr->bclink.oos_state = 0;
268 n_ptr->bclink.acked = tipc_bclink_get_last_sent();
269 tipc_bclink_add_node(n_ptr->addr);
270}
271
272static void node_name_purge_complete(unsigned long node_addr)
273{
274 struct tipc_node *n_ptr;
275
276 read_lock_bh(&tipc_net_lock);
277 n_ptr = tipc_node_find(node_addr);
278 if (n_ptr) {
279 tipc_node_lock(n_ptr);
280 n_ptr->block_setup &= ~WAIT_NAMES_GONE;
281 tipc_node_unlock(n_ptr);
282 }
283 read_unlock_bh(&tipc_net_lock);
284}
285
286static void node_lost_contact(struct tipc_node *n_ptr)
287{
288 char addr_string[16];
289 u32 i;
290
291 pr_info("Lost contact with %s\n",
292 tipc_addr_string_fill(addr_string, n_ptr->addr));
293
294 /* Flush broadcast link info associated with lost node */
295 if (n_ptr->bclink.recv_permitted) {
296 kfree_skb_list(n_ptr->bclink.deferred_head);
297 n_ptr->bclink.deferred_size = 0;
298
299 if (n_ptr->bclink.reasm_head) {
300 kfree_skb(n_ptr->bclink.reasm_head);
301 n_ptr->bclink.reasm_head = NULL;
302 n_ptr->bclink.reasm_tail = NULL;
303 }
304
305 tipc_bclink_remove_node(n_ptr->addr);
306 tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ);
307
308 n_ptr->bclink.recv_permitted = false;
309 }
310
311 /* Abort link changeover */
312 for (i = 0; i < MAX_BEARERS; i++) {
313 struct tipc_link *l_ptr = n_ptr->links[i];
314 if (!l_ptr)
315 continue;
316 l_ptr->reset_checkpoint = l_ptr->next_in_no;
317 l_ptr->exp_msg_count = 0;
318 tipc_link_reset_fragments(l_ptr);
319 }
320
321 /* Notify subscribers */
322 tipc_nodesub_notify(n_ptr);
323
324 /* Prevent re-contact with node until cleanup is done */
325 n_ptr->block_setup = WAIT_PEER_DOWN | WAIT_NAMES_GONE;
326 tipc_k_signal((Handler)node_name_purge_complete, n_ptr->addr);
327}
328
329struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
330{
331 u32 domain;
332 struct sk_buff *buf;
333 struct tipc_node *n_ptr;
334 struct tipc_node_info node_info;
335 u32 payload_size;
336
337 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
338 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
339
340 domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
341 if (!tipc_addr_domain_valid(domain))
342 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
343 " (network address)");
344
345 spin_lock_bh(&node_list_lock);
346 if (!tipc_num_nodes) {
347 spin_unlock_bh(&node_list_lock);
348 return tipc_cfg_reply_none();
349 }
350
351 /* For now, get space for all other nodes */
352 payload_size = TLV_SPACE(sizeof(node_info)) * tipc_num_nodes;
353 if (payload_size > 32768u) {
354 spin_unlock_bh(&node_list_lock);
355 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
356 " (too many nodes)");
357 }
358 spin_unlock_bh(&node_list_lock);
359
360 buf = tipc_cfg_reply_alloc(payload_size);
361 if (!buf)
362 return NULL;
363
364 /* Add TLVs for all nodes in scope */
365 rcu_read_lock();
366 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
367 if (!tipc_in_scope(domain, n_ptr->addr))
368 continue;
369 node_info.addr = htonl(n_ptr->addr);
370 node_info.up = htonl(tipc_node_is_up(n_ptr));
371 tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO,
372 &node_info, sizeof(node_info));
373 }
374 rcu_read_unlock();
375 return buf;
376}
377
378struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
379{
380 u32 domain;
381 struct sk_buff *buf;
382 struct tipc_node *n_ptr;
383 struct tipc_link_info link_info;
384 u32 payload_size;
385
386 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
387 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
388
389 domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
390 if (!tipc_addr_domain_valid(domain))
391 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
392 " (network address)");
393
394 if (!tipc_own_addr)
395 return tipc_cfg_reply_none();
396
397 spin_lock_bh(&node_list_lock);
398 /* Get space for all unicast links + broadcast link */
399 payload_size = TLV_SPACE((sizeof(link_info)) * (tipc_num_links + 1));
400 if (payload_size > 32768u) {
401 spin_unlock_bh(&node_list_lock);
402 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
403 " (too many links)");
404 }
405 spin_unlock_bh(&node_list_lock);
406
407 buf = tipc_cfg_reply_alloc(payload_size);
408 if (!buf)
409 return NULL;
410
411 /* Add TLV for broadcast link */
412 link_info.dest = htonl(tipc_cluster_mask(tipc_own_addr));
413 link_info.up = htonl(1);
414 strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME);
415 tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info));
416
417 /* Add TLVs for any other links in scope */
418 rcu_read_lock();
419 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
420 u32 i;
421
422 if (!tipc_in_scope(domain, n_ptr->addr))
423 continue;
424 tipc_node_lock(n_ptr);
425 for (i = 0; i < MAX_BEARERS; i++) {
426 if (!n_ptr->links[i])
427 continue;
428 link_info.dest = htonl(n_ptr->addr);
429 link_info.up = htonl(tipc_link_is_up(n_ptr->links[i]));
430 strcpy(link_info.str, n_ptr->links[i]->name);
431 tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO,
432 &link_info, sizeof(link_info));
433 }
434 tipc_node_unlock(n_ptr);
435 }
436 rcu_read_unlock();
437 return buf;
438}