Loading...
1/*
2 * net/tipc/node.c: TIPC node management routines
3 *
4 * Copyright (c) 2000-2006, Ericsson AB
5 * Copyright (c) 2005-2006, 2010-2011, 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
42static void node_lost_contact(struct tipc_node *n_ptr);
43static void node_established_contact(struct tipc_node *n_ptr);
44
45static DEFINE_SPINLOCK(node_create_lock);
46
47static struct hlist_head node_htable[NODE_HTABLE_SIZE];
48LIST_HEAD(tipc_node_list);
49static u32 tipc_num_nodes;
50
51static atomic_t tipc_num_links = ATOMIC_INIT(0);
52u32 tipc_own_tag;
53
54/**
55 * tipc_node_find - locate specified node object, if it exists
56 */
57
58struct tipc_node *tipc_node_find(u32 addr)
59{
60 struct tipc_node *node;
61 struct hlist_node *pos;
62
63 if (unlikely(!in_own_cluster(addr)))
64 return NULL;
65
66 hlist_for_each_entry(node, pos, &node_htable[tipc_hashfn(addr)], hash) {
67 if (node->addr == addr)
68 return node;
69 }
70 return NULL;
71}
72
73/**
74 * tipc_node_create - create neighboring node
75 *
76 * Currently, this routine is called by neighbor discovery code, which holds
77 * net_lock for reading only. We must take node_create_lock to ensure a node
78 * isn't created twice if two different bearers discover the node at the same
79 * time. (It would be preferable to switch to holding net_lock in write mode,
80 * but this is a non-trivial change.)
81 */
82
83struct tipc_node *tipc_node_create(u32 addr)
84{
85 struct tipc_node *n_ptr, *temp_node;
86
87 spin_lock_bh(&node_create_lock);
88
89 n_ptr = tipc_node_find(addr);
90 if (n_ptr) {
91 spin_unlock_bh(&node_create_lock);
92 return n_ptr;
93 }
94
95 n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
96 if (!n_ptr) {
97 spin_unlock_bh(&node_create_lock);
98 warn("Node creation failed, no memory\n");
99 return NULL;
100 }
101
102 n_ptr->addr = addr;
103 spin_lock_init(&n_ptr->lock);
104 INIT_HLIST_NODE(&n_ptr->hash);
105 INIT_LIST_HEAD(&n_ptr->list);
106 INIT_LIST_HEAD(&n_ptr->nsub);
107
108 hlist_add_head(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
109
110 list_for_each_entry(temp_node, &tipc_node_list, list) {
111 if (n_ptr->addr < temp_node->addr)
112 break;
113 }
114 list_add_tail(&n_ptr->list, &temp_node->list);
115
116 tipc_num_nodes++;
117
118 spin_unlock_bh(&node_create_lock);
119 return n_ptr;
120}
121
122void tipc_node_delete(struct tipc_node *n_ptr)
123{
124 list_del(&n_ptr->list);
125 hlist_del(&n_ptr->hash);
126 kfree(n_ptr);
127
128 tipc_num_nodes--;
129}
130
131
132/**
133 * tipc_node_link_up - handle addition of link
134 *
135 * Link becomes active (alone or shared) or standby, depending on its priority.
136 */
137
138void tipc_node_link_up(struct tipc_node *n_ptr, struct link *l_ptr)
139{
140 struct link **active = &n_ptr->active_links[0];
141
142 n_ptr->working_links++;
143
144 info("Established link <%s> on network plane %c\n",
145 l_ptr->name, l_ptr->b_ptr->net_plane);
146
147 if (!active[0]) {
148 active[0] = active[1] = l_ptr;
149 node_established_contact(n_ptr);
150 return;
151 }
152 if (l_ptr->priority < active[0]->priority) {
153 info("New link <%s> becomes standby\n", l_ptr->name);
154 return;
155 }
156 tipc_link_send_duplicate(active[0], l_ptr);
157 if (l_ptr->priority == active[0]->priority) {
158 active[0] = l_ptr;
159 return;
160 }
161 info("Old link <%s> becomes standby\n", active[0]->name);
162 if (active[1] != active[0])
163 info("Old link <%s> becomes standby\n", active[1]->name);
164 active[0] = active[1] = l_ptr;
165}
166
167/**
168 * node_select_active_links - select active link
169 */
170
171static void node_select_active_links(struct tipc_node *n_ptr)
172{
173 struct link **active = &n_ptr->active_links[0];
174 u32 i;
175 u32 highest_prio = 0;
176
177 active[0] = active[1] = NULL;
178
179 for (i = 0; i < MAX_BEARERS; i++) {
180 struct link *l_ptr = n_ptr->links[i];
181
182 if (!l_ptr || !tipc_link_is_up(l_ptr) ||
183 (l_ptr->priority < highest_prio))
184 continue;
185
186 if (l_ptr->priority > highest_prio) {
187 highest_prio = l_ptr->priority;
188 active[0] = active[1] = l_ptr;
189 } else {
190 active[1] = l_ptr;
191 }
192 }
193}
194
195/**
196 * tipc_node_link_down - handle loss of link
197 */
198
199void tipc_node_link_down(struct tipc_node *n_ptr, struct link *l_ptr)
200{
201 struct link **active;
202
203 n_ptr->working_links--;
204
205 if (!tipc_link_is_active(l_ptr)) {
206 info("Lost standby link <%s> on network plane %c\n",
207 l_ptr->name, l_ptr->b_ptr->net_plane);
208 return;
209 }
210 info("Lost link <%s> on network plane %c\n",
211 l_ptr->name, l_ptr->b_ptr->net_plane);
212
213 active = &n_ptr->active_links[0];
214 if (active[0] == l_ptr)
215 active[0] = active[1];
216 if (active[1] == l_ptr)
217 active[1] = active[0];
218 if (active[0] == l_ptr)
219 node_select_active_links(n_ptr);
220 if (tipc_node_is_up(n_ptr))
221 tipc_link_changeover(l_ptr);
222 else
223 node_lost_contact(n_ptr);
224}
225
226int tipc_node_active_links(struct tipc_node *n_ptr)
227{
228 return n_ptr->active_links[0] != NULL;
229}
230
231int tipc_node_redundant_links(struct tipc_node *n_ptr)
232{
233 return n_ptr->working_links > 1;
234}
235
236int tipc_node_is_up(struct tipc_node *n_ptr)
237{
238 return tipc_node_active_links(n_ptr);
239}
240
241void tipc_node_attach_link(struct tipc_node *n_ptr, struct link *l_ptr)
242{
243 n_ptr->links[l_ptr->b_ptr->identity] = l_ptr;
244 atomic_inc(&tipc_num_links);
245 n_ptr->link_cnt++;
246}
247
248void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr)
249{
250 n_ptr->links[l_ptr->b_ptr->identity] = NULL;
251 atomic_dec(&tipc_num_links);
252 n_ptr->link_cnt--;
253}
254
255/*
256 * Routing table management - five cases to handle:
257 *
258 * 1: A link towards a zone/cluster external node comes up.
259 * => Send a multicast message updating routing tables of all
260 * system nodes within own cluster that the new destination
261 * can be reached via this node.
262 * (node.establishedContact()=>cluster.multicastNewRoute())
263 *
264 * 2: A link towards a slave node comes up.
265 * => Send a multicast message updating routing tables of all
266 * system nodes within own cluster that the new destination
267 * can be reached via this node.
268 * (node.establishedContact()=>cluster.multicastNewRoute())
269 * => Send a message to the slave node about existence
270 * of all system nodes within cluster:
271 * (node.establishedContact()=>cluster.sendLocalRoutes())
272 *
273 * 3: A new cluster local system node becomes available.
274 * => Send message(s) to this particular node containing
275 * information about all cluster external and slave
276 * nodes which can be reached via this node.
277 * (node.establishedContact()==>network.sendExternalRoutes())
278 * (node.establishedContact()==>network.sendSlaveRoutes())
279 * => Send messages to all directly connected slave nodes
280 * containing information about the existence of the new node
281 * (node.establishedContact()=>cluster.multicastNewRoute())
282 *
283 * 4: The link towards a zone/cluster external node or slave
284 * node goes down.
285 * => Send a multcast message updating routing tables of all
286 * nodes within cluster that the new destination can not any
287 * longer be reached via this node.
288 * (node.lostAllLinks()=>cluster.bcastLostRoute())
289 *
290 * 5: A cluster local system node becomes unavailable.
291 * => Remove all references to this node from the local
292 * routing tables. Note: This is a completely node
293 * local operation.
294 * (node.lostAllLinks()=>network.removeAsRouter())
295 * => Send messages to all directly connected slave nodes
296 * containing information about loss of the node
297 * (node.establishedContact()=>cluster.multicastLostRoute())
298 *
299 */
300
301static void node_established_contact(struct tipc_node *n_ptr)
302{
303 tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr);
304
305 /* Syncronize broadcast acks */
306 n_ptr->bclink.acked = tipc_bclink_get_last_sent();
307
308 if (n_ptr->bclink.supported) {
309 tipc_nmap_add(&tipc_bcast_nmap, n_ptr->addr);
310 if (n_ptr->addr < tipc_own_addr)
311 tipc_own_tag++;
312 }
313}
314
315static void node_cleanup_finished(unsigned long node_addr)
316{
317 struct tipc_node *n_ptr;
318
319 read_lock_bh(&tipc_net_lock);
320 n_ptr = tipc_node_find(node_addr);
321 if (n_ptr) {
322 tipc_node_lock(n_ptr);
323 n_ptr->cleanup_required = 0;
324 tipc_node_unlock(n_ptr);
325 }
326 read_unlock_bh(&tipc_net_lock);
327}
328
329static void node_lost_contact(struct tipc_node *n_ptr)
330{
331 char addr_string[16];
332 u32 i;
333
334 /* Clean up broadcast reception remains */
335 n_ptr->bclink.gap_after = n_ptr->bclink.gap_to = 0;
336 while (n_ptr->bclink.deferred_head) {
337 struct sk_buff *buf = n_ptr->bclink.deferred_head;
338 n_ptr->bclink.deferred_head = buf->next;
339 buf_discard(buf);
340 }
341 if (n_ptr->bclink.defragm) {
342 buf_discard(n_ptr->bclink.defragm);
343 n_ptr->bclink.defragm = NULL;
344 }
345
346 if (n_ptr->bclink.supported) {
347 tipc_bclink_acknowledge(n_ptr,
348 mod(n_ptr->bclink.acked + 10000));
349 tipc_nmap_remove(&tipc_bcast_nmap, n_ptr->addr);
350 if (n_ptr->addr < tipc_own_addr)
351 tipc_own_tag--;
352 }
353
354 info("Lost contact with %s\n",
355 tipc_addr_string_fill(addr_string, n_ptr->addr));
356
357 /* Abort link changeover */
358 for (i = 0; i < MAX_BEARERS; i++) {
359 struct link *l_ptr = n_ptr->links[i];
360 if (!l_ptr)
361 continue;
362 l_ptr->reset_checkpoint = l_ptr->next_in_no;
363 l_ptr->exp_msg_count = 0;
364 tipc_link_reset_fragments(l_ptr);
365 }
366
367 /* Notify subscribers */
368 tipc_nodesub_notify(n_ptr);
369
370 /* Prevent re-contact with node until all cleanup is done */
371
372 n_ptr->cleanup_required = 1;
373 tipc_k_signal((Handler)node_cleanup_finished, n_ptr->addr);
374}
375
376struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
377{
378 u32 domain;
379 struct sk_buff *buf;
380 struct tipc_node *n_ptr;
381 struct tipc_node_info node_info;
382 u32 payload_size;
383
384 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
385 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
386
387 domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
388 if (!tipc_addr_domain_valid(domain))
389 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
390 " (network address)");
391
392 read_lock_bh(&tipc_net_lock);
393 if (!tipc_num_nodes) {
394 read_unlock_bh(&tipc_net_lock);
395 return tipc_cfg_reply_none();
396 }
397
398 /* For now, get space for all other nodes */
399
400 payload_size = TLV_SPACE(sizeof(node_info)) * tipc_num_nodes;
401 if (payload_size > 32768u) {
402 read_unlock_bh(&tipc_net_lock);
403 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
404 " (too many nodes)");
405 }
406 buf = tipc_cfg_reply_alloc(payload_size);
407 if (!buf) {
408 read_unlock_bh(&tipc_net_lock);
409 return NULL;
410 }
411
412 /* Add TLVs for all nodes in scope */
413
414 list_for_each_entry(n_ptr, &tipc_node_list, list) {
415 if (!tipc_in_scope(domain, n_ptr->addr))
416 continue;
417 node_info.addr = htonl(n_ptr->addr);
418 node_info.up = htonl(tipc_node_is_up(n_ptr));
419 tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO,
420 &node_info, sizeof(node_info));
421 }
422
423 read_unlock_bh(&tipc_net_lock);
424 return buf;
425}
426
427struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
428{
429 u32 domain;
430 struct sk_buff *buf;
431 struct tipc_node *n_ptr;
432 struct tipc_link_info link_info;
433 u32 payload_size;
434
435 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
436 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
437
438 domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
439 if (!tipc_addr_domain_valid(domain))
440 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
441 " (network address)");
442
443 if (tipc_mode != TIPC_NET_MODE)
444 return tipc_cfg_reply_none();
445
446 read_lock_bh(&tipc_net_lock);
447
448 /* Get space for all unicast links + multicast link */
449
450 payload_size = TLV_SPACE(sizeof(link_info)) *
451 (atomic_read(&tipc_num_links) + 1);
452 if (payload_size > 32768u) {
453 read_unlock_bh(&tipc_net_lock);
454 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
455 " (too many links)");
456 }
457 buf = tipc_cfg_reply_alloc(payload_size);
458 if (!buf) {
459 read_unlock_bh(&tipc_net_lock);
460 return NULL;
461 }
462
463 /* Add TLV for broadcast link */
464
465 link_info.dest = htonl(tipc_cluster_mask(tipc_own_addr));
466 link_info.up = htonl(1);
467 strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME);
468 tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info));
469
470 /* Add TLVs for any other links in scope */
471
472 list_for_each_entry(n_ptr, &tipc_node_list, list) {
473 u32 i;
474
475 if (!tipc_in_scope(domain, n_ptr->addr))
476 continue;
477 tipc_node_lock(n_ptr);
478 for (i = 0; i < MAX_BEARERS; i++) {
479 if (!n_ptr->links[i])
480 continue;
481 link_info.dest = htonl(n_ptr->addr);
482 link_info.up = htonl(tipc_link_is_up(n_ptr->links[i]));
483 strcpy(link_info.str, n_ptr->links[i]->name);
484 tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO,
485 &link_info, sizeof(link_info));
486 }
487 tipc_node_unlock(n_ptr);
488 }
489
490 read_unlock_bh(&tipc_net_lock);
491 return buf;
492}
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}