Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/node.c: TIPC node management routines | |
c4307285 | 3 | * |
c64f7a6a | 4 | * Copyright (c) 2000-2006, 2012 Ericsson AB |
46651c59 | 5 | * Copyright (c) 2005-2006, 2010-2014, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
38 | #include "config.h" | |
39 | #include "node.h" | |
b97bf3fd | 40 | #include "name_distr.h" |
b97bf3fd | 41 | |
a635b46b AS |
42 | #define NODE_HTABLE_SIZE 512 |
43 | ||
6c00055a DM |
44 | static void node_lost_contact(struct tipc_node *n_ptr); |
45 | static void node_established_contact(struct tipc_node *n_ptr); | |
b97bf3fd | 46 | |
672d99e1 AS |
47 | static struct hlist_head node_htable[NODE_HTABLE_SIZE]; |
48 | LIST_HEAD(tipc_node_list); | |
49 | static u32 tipc_num_nodes; | |
dde20266 | 50 | static u32 tipc_num_links; |
46651c59 | 51 | static DEFINE_SPINLOCK(node_list_lock); |
34e46258 | 52 | |
a635b46b AS |
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 | */ | |
872f24db | 59 | static unsigned int tipc_hashfn(u32 addr) |
a635b46b AS |
60 | { |
61 | return addr & (NODE_HTABLE_SIZE - 1); | |
62 | } | |
63 | ||
1ec2bb08 | 64 | /* |
672d99e1 AS |
65 | * tipc_node_find - locate specified node object, if it exists |
66 | */ | |
672d99e1 AS |
67 | struct tipc_node *tipc_node_find(u32 addr) |
68 | { | |
69 | struct tipc_node *node; | |
672d99e1 | 70 | |
336ebf5b | 71 | if (unlikely(!in_own_cluster_exact(addr))) |
672d99e1 AS |
72 | return NULL; |
73 | ||
6c7a762e YX |
74 | rcu_read_lock(); |
75 | hlist_for_each_entry_rcu(node, &node_htable[tipc_hashfn(addr)], hash) { | |
46651c59 | 76 | if (node->addr == addr) { |
6c7a762e | 77 | rcu_read_unlock(); |
672d99e1 | 78 | return node; |
46651c59 | 79 | } |
672d99e1 | 80 | } |
6c7a762e | 81 | rcu_read_unlock(); |
672d99e1 AS |
82 | return NULL; |
83 | } | |
84 | ||
6c00055a | 85 | struct tipc_node *tipc_node_create(u32 addr) |
b97bf3fd | 86 | { |
672d99e1 | 87 | struct tipc_node *n_ptr, *temp_node; |
b97bf3fd | 88 | |
46651c59 | 89 | spin_lock_bh(&node_list_lock); |
2ecb0924 | 90 | |
5af54792 | 91 | n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC); |
a10bd924 | 92 | if (!n_ptr) { |
46651c59 | 93 | spin_unlock_bh(&node_list_lock); |
2cf8aa19 | 94 | pr_warn("Node creation failed, no memory\n"); |
a10bd924 AS |
95 | return NULL; |
96 | } | |
97 | ||
a10bd924 | 98 | n_ptr->addr = addr; |
51a8e4de | 99 | spin_lock_init(&n_ptr->lock); |
672d99e1 AS |
100 | INIT_HLIST_NODE(&n_ptr->hash); |
101 | INIT_LIST_HEAD(&n_ptr->list); | |
a10bd924 | 102 | INIT_LIST_HEAD(&n_ptr->nsub); |
8f92df6a | 103 | |
6c7a762e | 104 | hlist_add_head_rcu(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]); |
672d99e1 | 105 | |
6c7a762e | 106 | list_for_each_entry_rcu(temp_node, &tipc_node_list, list) { |
672d99e1 AS |
107 | if (n_ptr->addr < temp_node->addr) |
108 | break; | |
109 | } | |
6c7a762e | 110 | list_add_tail_rcu(&n_ptr->list, &temp_node->list); |
10f465c4 | 111 | n_ptr->flags = TIPC_NODE_DOWN; |
fc0eea69 | 112 | n_ptr->signature = INVALID_NODE_SIG; |
672d99e1 AS |
113 | |
114 | tipc_num_nodes++; | |
a10bd924 | 115 | |
46651c59 | 116 | spin_unlock_bh(&node_list_lock); |
b97bf3fd PL |
117 | return n_ptr; |
118 | } | |
119 | ||
46651c59 | 120 | static void tipc_node_delete(struct tipc_node *n_ptr) |
b97bf3fd | 121 | { |
6c7a762e YX |
122 | list_del_rcu(&n_ptr->list); |
123 | hlist_del_rcu(&n_ptr->hash); | |
124 | kfree_rcu(n_ptr, rcu); | |
8f92df6a | 125 | |
672d99e1 | 126 | tipc_num_nodes--; |
b97bf3fd PL |
127 | } |
128 | ||
46651c59 YX |
129 | void 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 | ||
b97bf3fd | 139 | /** |
4323add6 | 140 | * tipc_node_link_up - handle addition of link |
c4307285 | 141 | * |
b97bf3fd PL |
142 | * Link becomes active (alone or shared) or standby, depending on its priority. |
143 | */ | |
a18c4bc3 | 144 | void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 145 | { |
a18c4bc3 | 146 | struct tipc_link **active = &n_ptr->active_links[0]; |
a89778d8 | 147 | u32 addr = n_ptr->addr; |
b97bf3fd | 148 | |
5392d646 | 149 | n_ptr->working_links++; |
a89778d8 EH |
150 | tipc_nametbl_publish(TIPC_LINK_STATE, addr, addr, TIPC_NODE_SCOPE, |
151 | l_ptr->bearer_id, addr); | |
2cf8aa19 | 152 | pr_info("Established link <%s> on network plane %c\n", |
7a2f7d18 | 153 | l_ptr->name, l_ptr->net_plane); |
c4307285 | 154 | |
b97bf3fd | 155 | if (!active[0]) { |
b97bf3fd PL |
156 | active[0] = active[1] = l_ptr; |
157 | node_established_contact(n_ptr); | |
158 | return; | |
159 | } | |
c4307285 | 160 | if (l_ptr->priority < active[0]->priority) { |
2cf8aa19 | 161 | pr_info("New link <%s> becomes standby\n", l_ptr->name); |
b97bf3fd PL |
162 | return; |
163 | } | |
247f0f3c | 164 | tipc_link_dup_queue_xmit(active[0], l_ptr); |
c4307285 | 165 | if (l_ptr->priority == active[0]->priority) { |
b97bf3fd PL |
166 | active[0] = l_ptr; |
167 | return; | |
168 | } | |
2cf8aa19 | 169 | pr_info("Old link <%s> becomes standby\n", active[0]->name); |
a10bd924 | 170 | if (active[1] != active[0]) |
2cf8aa19 | 171 | pr_info("Old link <%s> becomes standby\n", active[1]->name); |
b97bf3fd PL |
172 | active[0] = active[1] = l_ptr; |
173 | } | |
174 | ||
175 | /** | |
176 | * node_select_active_links - select active link | |
177 | */ | |
6c00055a | 178 | static void node_select_active_links(struct tipc_node *n_ptr) |
b97bf3fd | 179 | { |
a18c4bc3 | 180 | struct tipc_link **active = &n_ptr->active_links[0]; |
b97bf3fd PL |
181 | u32 i; |
182 | u32 highest_prio = 0; | |
183 | ||
c4307285 | 184 | active[0] = active[1] = NULL; |
b97bf3fd PL |
185 | |
186 | for (i = 0; i < MAX_BEARERS; i++) { | |
a18c4bc3 | 187 | struct tipc_link *l_ptr = n_ptr->links[i]; |
b97bf3fd | 188 | |
4323add6 | 189 | if (!l_ptr || !tipc_link_is_up(l_ptr) || |
b97bf3fd PL |
190 | (l_ptr->priority < highest_prio)) |
191 | continue; | |
192 | ||
193 | if (l_ptr->priority > highest_prio) { | |
c4307285 | 194 | highest_prio = l_ptr->priority; |
b97bf3fd PL |
195 | active[0] = active[1] = l_ptr; |
196 | } else { | |
197 | active[1] = l_ptr; | |
198 | } | |
199 | } | |
200 | } | |
201 | ||
202 | /** | |
4323add6 | 203 | * tipc_node_link_down - handle loss of link |
b97bf3fd | 204 | */ |
a18c4bc3 | 205 | void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 206 | { |
a18c4bc3 | 207 | struct tipc_link **active; |
a89778d8 | 208 | u32 addr = n_ptr->addr; |
b97bf3fd | 209 | |
5392d646 | 210 | n_ptr->working_links--; |
a89778d8 | 211 | tipc_nametbl_withdraw(TIPC_LINK_STATE, addr, l_ptr->bearer_id, addr); |
5392d646 | 212 | |
4323add6 | 213 | if (!tipc_link_is_active(l_ptr)) { |
2cf8aa19 | 214 | pr_info("Lost standby link <%s> on network plane %c\n", |
7a2f7d18 | 215 | l_ptr->name, l_ptr->net_plane); |
b97bf3fd PL |
216 | return; |
217 | } | |
2cf8aa19 | 218 | pr_info("Lost link <%s> on network plane %c\n", |
7a2f7d18 | 219 | l_ptr->name, l_ptr->net_plane); |
b97bf3fd PL |
220 | |
221 | active = &n_ptr->active_links[0]; | |
222 | if (active[0] == l_ptr) | |
223 | active[0] = active[1]; | |
224 | if (active[1] == l_ptr) | |
225 | active[1] = active[0]; | |
226 | if (active[0] == l_ptr) | |
227 | node_select_active_links(n_ptr); | |
c4307285 | 228 | if (tipc_node_is_up(n_ptr)) |
170b3927 | 229 | tipc_link_failover_send_queue(l_ptr); |
c4307285 | 230 | else |
b97bf3fd PL |
231 | node_lost_contact(n_ptr); |
232 | } | |
233 | ||
8f19afb2 | 234 | int tipc_node_active_links(struct tipc_node *n_ptr) |
b97bf3fd | 235 | { |
76ae0d71 | 236 | return n_ptr->active_links[0] != NULL; |
b97bf3fd PL |
237 | } |
238 | ||
6c00055a | 239 | int tipc_node_is_up(struct tipc_node *n_ptr) |
b97bf3fd | 240 | { |
8f19afb2 | 241 | return tipc_node_active_links(n_ptr); |
b97bf3fd PL |
242 | } |
243 | ||
a18c4bc3 | 244 | void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 245 | { |
7a2f7d18 | 246 | n_ptr->links[l_ptr->bearer_id] = l_ptr; |
dde20266 YX |
247 | spin_lock_bh(&node_list_lock); |
248 | tipc_num_links++; | |
249 | spin_unlock_bh(&node_list_lock); | |
37b9c08a | 250 | n_ptr->link_cnt++; |
b97bf3fd PL |
251 | } |
252 | ||
a18c4bc3 | 253 | void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 254 | { |
7d33939f JPM |
255 | int i; |
256 | ||
257 | for (i = 0; i < MAX_BEARERS; i++) { | |
074bb43e JPM |
258 | if (l_ptr != n_ptr->links[i]) |
259 | continue; | |
260 | n_ptr->links[i] = NULL; | |
dde20266 YX |
261 | spin_lock_bh(&node_list_lock); |
262 | tipc_num_links--; | |
263 | spin_unlock_bh(&node_list_lock); | |
074bb43e | 264 | n_ptr->link_cnt--; |
7d33939f | 265 | } |
b97bf3fd PL |
266 | } |
267 | ||
6c00055a | 268 | static void node_established_contact(struct tipc_node *n_ptr) |
b97bf3fd | 269 | { |
51a8e4de | 270 | tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr); |
c64f7a6a | 271 | n_ptr->bclink.oos_state = 0; |
818f4da5 YX |
272 | n_ptr->bclink.acked = tipc_bclink_get_last_sent(); |
273 | tipc_bclink_add_node(n_ptr->addr); | |
b97bf3fd PL |
274 | } |
275 | ||
b4b56102 | 276 | static void node_name_purge_complete(unsigned long node_addr) |
5a68d5ee AS |
277 | { |
278 | struct tipc_node *n_ptr; | |
279 | ||
5a68d5ee AS |
280 | n_ptr = tipc_node_find(node_addr); |
281 | if (n_ptr) { | |
282 | tipc_node_lock(n_ptr); | |
10f465c4 | 283 | n_ptr->flags &= ~TIPC_NAMES_GONE; |
5a68d5ee AS |
284 | tipc_node_unlock(n_ptr); |
285 | } | |
5a68d5ee AS |
286 | } |
287 | ||
6c00055a | 288 | static void node_lost_contact(struct tipc_node *n_ptr) |
b97bf3fd | 289 | { |
b97bf3fd PL |
290 | char addr_string[16]; |
291 | u32 i; | |
292 | ||
2cf8aa19 EH |
293 | pr_info("Lost contact with %s\n", |
294 | tipc_addr_string_fill(addr_string, n_ptr->addr)); | |
c5bd4d85 AS |
295 | |
296 | /* Flush broadcast link info associated with lost node */ | |
389dd9bc | 297 | if (n_ptr->bclink.recv_permitted) { |
d77b3831 | 298 | kfree_skb_list(n_ptr->bclink.deferred_head); |
7a54d4a9 | 299 | n_ptr->bclink.deferred_size = 0; |
c5bd4d85 | 300 | |
40ba3cdf EH |
301 | if (n_ptr->bclink.reasm_head) { |
302 | kfree_skb(n_ptr->bclink.reasm_head); | |
303 | n_ptr->bclink.reasm_head = NULL; | |
304 | n_ptr->bclink.reasm_tail = NULL; | |
c5bd4d85 AS |
305 | } |
306 | ||
cd3decdf | 307 | tipc_bclink_remove_node(n_ptr->addr); |
36559591 | 308 | tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ); |
b97bf3fd | 309 | |
389dd9bc | 310 | n_ptr->bclink.recv_permitted = false; |
c5bd4d85 | 311 | } |
b97bf3fd PL |
312 | |
313 | /* Abort link changeover */ | |
314 | for (i = 0; i < MAX_BEARERS; i++) { | |
a18c4bc3 | 315 | struct tipc_link *l_ptr = n_ptr->links[i]; |
c4307285 | 316 | if (!l_ptr) |
b97bf3fd PL |
317 | continue; |
318 | l_ptr->reset_checkpoint = l_ptr->next_in_no; | |
319 | l_ptr->exp_msg_count = 0; | |
4323add6 | 320 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
321 | } |
322 | ||
323 | /* Notify subscribers */ | |
9db9fdd1 | 324 | n_ptr->flags = TIPC_NODE_LOST; |
5a68d5ee | 325 | |
b4b56102 | 326 | /* Prevent re-contact with node until cleanup is done */ |
9db9fdd1 | 327 | n_ptr->flags |= TIPC_NODE_DOWN | TIPC_NAMES_GONE; |
b4b56102 | 328 | tipc_k_signal((Handler)node_name_purge_complete, n_ptr->addr); |
b97bf3fd PL |
329 | } |
330 | ||
4323add6 | 331 | struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space) |
b97bf3fd PL |
332 | { |
333 | u32 domain; | |
334 | struct sk_buff *buf; | |
6c00055a | 335 | struct tipc_node *n_ptr; |
c4307285 | 336 | struct tipc_node_info node_info; |
ea13847b | 337 | u32 payload_size; |
b97bf3fd PL |
338 | |
339 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR)) | |
4323add6 | 340 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd | 341 | |
3e6c8cd5 | 342 | domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area)); |
4323add6 PL |
343 | if (!tipc_addr_domain_valid(domain)) |
344 | return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE | |
345 | " (network address)"); | |
b97bf3fd | 346 | |
46651c59 | 347 | spin_lock_bh(&node_list_lock); |
672d99e1 | 348 | if (!tipc_num_nodes) { |
46651c59 | 349 | spin_unlock_bh(&node_list_lock); |
c4307285 | 350 | return tipc_cfg_reply_none(); |
1aad72d6 | 351 | } |
b97bf3fd | 352 | |
08c80e9a | 353 | /* For now, get space for all other nodes */ |
672d99e1 | 354 | payload_size = TLV_SPACE(sizeof(node_info)) * tipc_num_nodes; |
1aad72d6 | 355 | if (payload_size > 32768u) { |
46651c59 | 356 | spin_unlock_bh(&node_list_lock); |
ea13847b AS |
357 | return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED |
358 | " (too many nodes)"); | |
1aad72d6 | 359 | } |
2220646a YX |
360 | spin_unlock_bh(&node_list_lock); |
361 | ||
ea13847b | 362 | buf = tipc_cfg_reply_alloc(payload_size); |
2220646a | 363 | if (!buf) |
b97bf3fd PL |
364 | return NULL; |
365 | ||
366 | /* Add TLVs for all nodes in scope */ | |
6c7a762e YX |
367 | rcu_read_lock(); |
368 | list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) { | |
672d99e1 | 369 | if (!tipc_in_scope(domain, n_ptr->addr)) |
b97bf3fd | 370 | continue; |
c4307285 YH |
371 | node_info.addr = htonl(n_ptr->addr); |
372 | node_info.up = htonl(tipc_node_is_up(n_ptr)); | |
373 | tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO, | |
4323add6 | 374 | &node_info, sizeof(node_info)); |
b97bf3fd | 375 | } |
6c7a762e | 376 | rcu_read_unlock(); |
b97bf3fd PL |
377 | return buf; |
378 | } | |
379 | ||
4323add6 | 380 | struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space) |
b97bf3fd PL |
381 | { |
382 | u32 domain; | |
383 | struct sk_buff *buf; | |
6c00055a | 384 | struct tipc_node *n_ptr; |
c4307285 | 385 | struct tipc_link_info link_info; |
ea13847b | 386 | u32 payload_size; |
b97bf3fd PL |
387 | |
388 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR)) | |
4323add6 | 389 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd | 390 | |
3e6c8cd5 | 391 | domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area)); |
4323add6 PL |
392 | if (!tipc_addr_domain_valid(domain)) |
393 | return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE | |
394 | " (network address)"); | |
b97bf3fd | 395 | |
b58343f9 | 396 | if (!tipc_own_addr) |
c4307285 YH |
397 | return tipc_cfg_reply_none(); |
398 | ||
46651c59 | 399 | spin_lock_bh(&node_list_lock); |
7a54d4a9 | 400 | /* Get space for all unicast links + broadcast link */ |
dde20266 | 401 | payload_size = TLV_SPACE((sizeof(link_info)) * (tipc_num_links + 1)); |
1aad72d6 | 402 | if (payload_size > 32768u) { |
46651c59 | 403 | spin_unlock_bh(&node_list_lock); |
ea13847b AS |
404 | return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED |
405 | " (too many links)"); | |
1aad72d6 | 406 | } |
dde20266 YX |
407 | spin_unlock_bh(&node_list_lock); |
408 | ||
ea13847b | 409 | buf = tipc_cfg_reply_alloc(payload_size); |
dde20266 | 410 | if (!buf) |
b97bf3fd PL |
411 | return NULL; |
412 | ||
413 | /* Add TLV for broadcast link */ | |
a3796f89 | 414 | link_info.dest = htonl(tipc_cluster_mask(tipc_own_addr)); |
c4307285 | 415 | link_info.up = htonl(1); |
4b704d59 | 416 | strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME); |
4323add6 | 417 | tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info)); |
b97bf3fd PL |
418 | |
419 | /* Add TLVs for any other links in scope */ | |
6c7a762e YX |
420 | rcu_read_lock(); |
421 | list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) { | |
c4307285 | 422 | u32 i; |
b97bf3fd | 423 | |
672d99e1 | 424 | if (!tipc_in_scope(domain, n_ptr->addr)) |
b97bf3fd | 425 | continue; |
1aad72d6 | 426 | tipc_node_lock(n_ptr); |
c4307285 YH |
427 | for (i = 0; i < MAX_BEARERS; i++) { |
428 | if (!n_ptr->links[i]) | |
429 | continue; | |
430 | link_info.dest = htonl(n_ptr->addr); | |
431 | link_info.up = htonl(tipc_link_is_up(n_ptr->links[i])); | |
432 | strcpy(link_info.str, n_ptr->links[i]->name); | |
433 | tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, | |
4323add6 | 434 | &link_info, sizeof(link_info)); |
c4307285 | 435 | } |
1aad72d6 | 436 | tipc_node_unlock(n_ptr); |
b97bf3fd | 437 | } |
6c7a762e | 438 | rcu_read_unlock(); |
b97bf3fd PL |
439 | return buf; |
440 | } | |
78acb1f9 EH |
441 | |
442 | /** | |
443 | * tipc_node_get_linkname - get the name of a link | |
444 | * | |
445 | * @bearer_id: id of the bearer | |
446 | * @node: peer node address | |
447 | * @linkname: link name output buffer | |
448 | * | |
449 | * Returns 0 on success | |
450 | */ | |
451 | int tipc_node_get_linkname(u32 bearer_id, u32 addr, char *linkname, size_t len) | |
452 | { | |
453 | struct tipc_link *link; | |
454 | struct tipc_node *node = tipc_node_find(addr); | |
455 | ||
d7bb74c3 | 456 | if ((bearer_id >= MAX_BEARERS) || !node) |
78acb1f9 EH |
457 | return -EINVAL; |
458 | tipc_node_lock(node); | |
459 | link = node->links[bearer_id]; | |
460 | if (link) { | |
461 | strncpy(linkname, link->name, len); | |
462 | tipc_node_unlock(node); | |
463 | return 0; | |
464 | } | |
465 | tipc_node_unlock(node); | |
466 | return -EINVAL; | |
467 | } | |
9db9fdd1 YX |
468 | |
469 | void tipc_node_unlock(struct tipc_node *node) | |
470 | { | |
471 | LIST_HEAD(nsub_list); | |
472 | ||
473 | if (likely(!node->flags)) { | |
474 | spin_unlock_bh(&node->lock); | |
475 | return; | |
476 | } | |
477 | ||
478 | if (node->flags & TIPC_NODE_LOST) { | |
479 | list_replace_init(&node->nsub, &nsub_list); | |
480 | node->flags &= ~TIPC_NODE_LOST; | |
481 | } | |
482 | spin_unlock_bh(&node->lock); | |
483 | ||
484 | if (!list_empty(&nsub_list)) | |
485 | tipc_nodesub_notify(&nsub_list); | |
486 | } |