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b97bf3fd PL |
1 | /* |
2 | * net/tipc/name_distr.c: TIPC name distribution code | |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 2000-2006, Ericsson AB |
431697eb | 5 | * Copyright (c) 2005, 2010-2011, 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" | |
b97bf3fd | 38 | #include "link.h" |
b97bf3fd PL |
39 | #include "name_distr.h" |
40 | ||
b97bf3fd PL |
41 | #define ITEM_SIZE sizeof(struct distr_item) |
42 | ||
43 | /** | |
44 | * struct distr_item - publication info distributed to other nodes | |
45 | * @type: name sequence type | |
46 | * @lower: name sequence lower bound | |
47 | * @upper: name sequence upper bound | |
48 | * @ref: publishing port reference | |
49 | * @key: publication key | |
c4307285 | 50 | * |
b97bf3fd | 51 | * ===> All fields are stored in network byte order. <=== |
c4307285 | 52 | * |
b97bf3fd PL |
53 | * First 3 fields identify (name or) name sequence being published. |
54 | * Reference field uniquely identifies port that published name sequence. | |
55 | * Key field uniquely identifies publication, in the event a port has | |
56 | * multiple publications of the same name sequence. | |
c4307285 YH |
57 | * |
58 | * Note: There is no field that identifies the publishing node because it is | |
b97bf3fd PL |
59 | * the same for all items contained within a publication message. |
60 | */ | |
61 | ||
62 | struct distr_item { | |
3e6c8cd5 AV |
63 | __be32 type; |
64 | __be32 lower; | |
65 | __be32 upper; | |
66 | __be32 ref; | |
67 | __be32 key; | |
b97bf3fd PL |
68 | }; |
69 | ||
70 | /** | |
3f8375fe AS |
71 | * struct publ_list - list of publications made by this node |
72 | * @list: circular list of publications | |
73 | * @list_size: number of entries in list | |
b97bf3fd | 74 | */ |
3f8375fe AS |
75 | struct publ_list { |
76 | struct list_head list; | |
77 | u32 size; | |
78 | }; | |
b97bf3fd | 79 | |
a909804f AS |
80 | static struct publ_list publ_zone = { |
81 | .list = LIST_HEAD_INIT(publ_zone.list), | |
82 | .size = 0, | |
83 | }; | |
84 | ||
3f8375fe AS |
85 | static struct publ_list publ_cluster = { |
86 | .list = LIST_HEAD_INIT(publ_cluster.list), | |
87 | .size = 0, | |
88 | }; | |
b97bf3fd | 89 | |
a909804f AS |
90 | static struct publ_list publ_node = { |
91 | .list = LIST_HEAD_INIT(publ_node.list), | |
92 | .size = 0, | |
93 | }; | |
94 | ||
95 | static struct publ_list *publ_lists[] = { | |
96 | NULL, | |
97 | &publ_zone, /* publ_lists[TIPC_ZONE_SCOPE] */ | |
98 | &publ_cluster, /* publ_lists[TIPC_CLUSTER_SCOPE] */ | |
99 | &publ_node /* publ_lists[TIPC_NODE_SCOPE] */ | |
100 | }; | |
101 | ||
102 | ||
b97bf3fd PL |
103 | /** |
104 | * publ_to_item - add publication info to a publication message | |
105 | */ | |
106 | ||
107 | static void publ_to_item(struct distr_item *i, struct publication *p) | |
108 | { | |
109 | i->type = htonl(p->type); | |
110 | i->lower = htonl(p->lower); | |
111 | i->upper = htonl(p->upper); | |
112 | i->ref = htonl(p->ref); | |
113 | i->key = htonl(p->key); | |
b97bf3fd PL |
114 | } |
115 | ||
116 | /** | |
117 | * named_prepare_buf - allocate & initialize a publication message | |
118 | */ | |
119 | ||
120 | static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest) | |
121 | { | |
741d9eb7 | 122 | struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size); |
b97bf3fd PL |
123 | struct tipc_msg *msg; |
124 | ||
125 | if (buf != NULL) { | |
126 | msg = buf_msg(buf); | |
741d9eb7 AS |
127 | tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest); |
128 | msg_set_size(msg, INT_H_SIZE + size); | |
b97bf3fd PL |
129 | } |
130 | return buf; | |
131 | } | |
132 | ||
8f92df6a AS |
133 | static void named_cluster_distribute(struct sk_buff *buf) |
134 | { | |
135 | struct sk_buff *buf_copy; | |
136 | struct tipc_node *n_ptr; | |
8f92df6a | 137 | |
672d99e1 | 138 | list_for_each_entry(n_ptr, &tipc_node_list, list) { |
8f19afb2 | 139 | if (tipc_node_active_links(n_ptr)) { |
8f92df6a AS |
140 | buf_copy = skb_copy(buf, GFP_ATOMIC); |
141 | if (!buf_copy) | |
142 | break; | |
143 | msg_set_destnode(buf_msg(buf_copy), n_ptr->addr); | |
144 | tipc_link_send(buf_copy, n_ptr->addr, n_ptr->addr); | |
145 | } | |
146 | } | |
147 | ||
5f6d9123 | 148 | kfree_skb(buf); |
8f92df6a AS |
149 | } |
150 | ||
b97bf3fd | 151 | /** |
4323add6 | 152 | * tipc_named_publish - tell other nodes about a new publication by this node |
b97bf3fd PL |
153 | */ |
154 | ||
4323add6 | 155 | void tipc_named_publish(struct publication *publ) |
b97bf3fd PL |
156 | { |
157 | struct sk_buff *buf; | |
158 | struct distr_item *item; | |
159 | ||
a909804f AS |
160 | list_add_tail(&publ->local_list, &publ_lists[publ->scope]->list); |
161 | publ_lists[publ->scope]->size++; | |
b97bf3fd PL |
162 | |
163 | buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0); | |
164 | if (!buf) { | |
a10bd924 | 165 | warn("Publication distribution failure\n"); |
b97bf3fd PL |
166 | return; |
167 | } | |
168 | ||
169 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
170 | publ_to_item(item, publ); | |
8f92df6a | 171 | named_cluster_distribute(buf); |
b97bf3fd PL |
172 | } |
173 | ||
174 | /** | |
4323add6 | 175 | * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
b97bf3fd PL |
176 | */ |
177 | ||
4323add6 | 178 | void tipc_named_withdraw(struct publication *publ) |
b97bf3fd PL |
179 | { |
180 | struct sk_buff *buf; | |
181 | struct distr_item *item; | |
182 | ||
183 | list_del(&publ->local_list); | |
a909804f | 184 | publ_lists[publ->scope]->size--; |
b97bf3fd PL |
185 | |
186 | buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0); | |
187 | if (!buf) { | |
25985edc | 188 | warn("Withdrawal distribution failure\n"); |
b97bf3fd PL |
189 | return; |
190 | } | |
191 | ||
192 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
193 | publ_to_item(item, publ); | |
8f92df6a | 194 | named_cluster_distribute(buf); |
b97bf3fd PL |
195 | } |
196 | ||
e11aa059 AS |
197 | /* |
198 | * named_distribute - prepare name info for bulk distribution to another node | |
199 | */ | |
200 | static void named_distribute(struct list_head *message_list, u32 node, | |
201 | struct publ_list *pls, u32 max_item_buf) | |
202 | { | |
203 | struct publication *publ; | |
204 | struct sk_buff *buf = NULL; | |
205 | struct distr_item *item = NULL; | |
206 | u32 left = 0; | |
207 | u32 rest = pls->size * ITEM_SIZE; | |
208 | ||
209 | list_for_each_entry(publ, &pls->list, local_list) { | |
210 | if (!buf) { | |
211 | left = (rest <= max_item_buf) ? rest : max_item_buf; | |
212 | rest -= left; | |
213 | buf = named_prepare_buf(PUBLICATION, left, node); | |
214 | if (!buf) { | |
215 | warn("Bulk publication failure\n"); | |
216 | return; | |
217 | } | |
218 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
219 | } | |
220 | publ_to_item(item, publ); | |
221 | item++; | |
222 | left -= ITEM_SIZE; | |
223 | if (!left) { | |
224 | list_add_tail((struct list_head *)buf, message_list); | |
225 | buf = NULL; | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
b97bf3fd | 230 | /** |
4323add6 | 231 | * tipc_named_node_up - tell specified node about all publications by this node |
b97bf3fd PL |
232 | */ |
233 | ||
1c553bb5 | 234 | void tipc_named_node_up(unsigned long nodearg) |
b97bf3fd | 235 | { |
149ce37c | 236 | struct tipc_node *n_ptr; |
a18c4bc3 | 237 | struct tipc_link *l_ptr; |
9aa88c2a | 238 | struct list_head message_list; |
1c553bb5 | 239 | u32 node = (u32)nodearg; |
149ce37c AS |
240 | u32 max_item_buf = 0; |
241 | ||
242 | /* compute maximum amount of publication data to send per message */ | |
243 | ||
244 | read_lock_bh(&tipc_net_lock); | |
1c553bb5 | 245 | n_ptr = tipc_node_find(node); |
149ce37c AS |
246 | if (n_ptr) { |
247 | tipc_node_lock(n_ptr); | |
248 | l_ptr = n_ptr->active_links[0]; | |
249 | if (l_ptr) | |
250 | max_item_buf = ((l_ptr->max_pkt - INT_H_SIZE) / | |
251 | ITEM_SIZE) * ITEM_SIZE; | |
252 | tipc_node_unlock(n_ptr); | |
253 | } | |
254 | read_unlock_bh(&tipc_net_lock); | |
255 | if (!max_item_buf) | |
256 | return; | |
b97bf3fd | 257 | |
9aa88c2a AS |
258 | /* create list of publication messages, then send them as a unit */ |
259 | ||
260 | INIT_LIST_HEAD(&message_list); | |
261 | ||
c4307285 | 262 | read_lock_bh(&tipc_nametbl_lock); |
e11aa059 | 263 | named_distribute(&message_list, node, &publ_cluster, max_item_buf); |
a909804f | 264 | named_distribute(&message_list, node, &publ_zone, max_item_buf); |
c4307285 | 265 | read_unlock_bh(&tipc_nametbl_lock); |
9aa88c2a AS |
266 | |
267 | tipc_link_send_names(&message_list, (u32)node); | |
b97bf3fd PL |
268 | } |
269 | ||
270 | /** | |
f1379173 | 271 | * named_purge_publ - remove publication associated with a failed node |
c4307285 YH |
272 | * |
273 | * Invoked for each publication issued by a newly failed node. | |
b97bf3fd | 274 | * Removes publication structure from name table & deletes it. |
b97bf3fd PL |
275 | */ |
276 | ||
f1379173 | 277 | static void named_purge_publ(struct publication *publ) |
b97bf3fd PL |
278 | { |
279 | struct publication *p; | |
f131072c | 280 | |
c4307285 | 281 | write_lock_bh(&tipc_nametbl_lock); |
c4307285 | 282 | p = tipc_nametbl_remove_publ(publ->type, publ->lower, |
4323add6 | 283 | publ->node, publ->ref, publ->key); |
431697eb AS |
284 | if (p) |
285 | tipc_nodesub_unsubscribe(&p->subscr); | |
4323add6 | 286 | write_unlock_bh(&tipc_nametbl_lock); |
f131072c | 287 | |
c4307285 | 288 | if (p != publ) { |
f131072c AS |
289 | err("Unable to remove publication from failed node\n" |
290 | "(type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n", | |
291 | publ->type, publ->lower, publ->node, publ->ref, publ->key); | |
292 | } | |
293 | ||
e83504f7 | 294 | kfree(p); |
b97bf3fd PL |
295 | } |
296 | ||
297 | /** | |
4323add6 | 298 | * tipc_named_recv - process name table update message sent by another node |
b97bf3fd PL |
299 | */ |
300 | ||
4323add6 | 301 | void tipc_named_recv(struct sk_buff *buf) |
b97bf3fd PL |
302 | { |
303 | struct publication *publ; | |
304 | struct tipc_msg *msg = buf_msg(buf); | |
305 | struct distr_item *item = (struct distr_item *)msg_data(msg); | |
306 | u32 count = msg_data_sz(msg) / ITEM_SIZE; | |
307 | ||
c4307285 | 308 | write_lock_bh(&tipc_nametbl_lock); |
b97bf3fd PL |
309 | while (count--) { |
310 | if (msg_type(msg) == PUBLICATION) { | |
c4307285 | 311 | publ = tipc_nametbl_insert_publ(ntohl(item->type), |
4323add6 PL |
312 | ntohl(item->lower), |
313 | ntohl(item->upper), | |
314 | TIPC_CLUSTER_SCOPE, | |
c4307285 | 315 | msg_orignode(msg), |
4323add6 PL |
316 | ntohl(item->ref), |
317 | ntohl(item->key)); | |
b97bf3fd | 318 | if (publ) { |
c4307285 YH |
319 | tipc_nodesub_subscribe(&publ->subscr, |
320 | msg_orignode(msg), | |
4323add6 | 321 | publ, |
f1379173 AS |
322 | (net_ev_handler) |
323 | named_purge_publ); | |
b97bf3fd PL |
324 | } |
325 | } else if (msg_type(msg) == WITHDRAWAL) { | |
4323add6 PL |
326 | publ = tipc_nametbl_remove_publ(ntohl(item->type), |
327 | ntohl(item->lower), | |
328 | msg_orignode(msg), | |
329 | ntohl(item->ref), | |
330 | ntohl(item->key)); | |
b97bf3fd PL |
331 | |
332 | if (publ) { | |
4323add6 | 333 | tipc_nodesub_unsubscribe(&publ->subscr); |
c4307285 | 334 | kfree(publ); |
f131072c AS |
335 | } else { |
336 | err("Unable to remove publication by node 0x%x\n" | |
337 | "(type=%u, lower=%u, ref=%u, key=%u)\n", | |
338 | msg_orignode(msg), | |
339 | ntohl(item->type), ntohl(item->lower), | |
340 | ntohl(item->ref), ntohl(item->key)); | |
b97bf3fd PL |
341 | } |
342 | } else { | |
a10bd924 | 343 | warn("Unrecognized name table message received\n"); |
b97bf3fd PL |
344 | } |
345 | item++; | |
346 | } | |
c4307285 | 347 | write_unlock_bh(&tipc_nametbl_lock); |
5f6d9123 | 348 | kfree_skb(buf); |
b97bf3fd PL |
349 | } |
350 | ||
351 | /** | |
4323add6 | 352 | * tipc_named_reinit - re-initialize local publication list |
c4307285 | 353 | * |
945af1c3 | 354 | * This routine is called whenever TIPC networking is enabled. |
b97bf3fd | 355 | * All existing publications by this node that have "cluster" or "zone" scope |
945af1c3 | 356 | * are updated to reflect the node's new network address. |
b97bf3fd PL |
357 | */ |
358 | ||
4323add6 | 359 | void tipc_named_reinit(void) |
b97bf3fd PL |
360 | { |
361 | struct publication *publ; | |
a909804f | 362 | int scope; |
b97bf3fd | 363 | |
c4307285 | 364 | write_lock_bh(&tipc_nametbl_lock); |
945af1c3 | 365 | |
a909804f AS |
366 | for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_CLUSTER_SCOPE; scope++) |
367 | list_for_each_entry(publ, &publ_lists[scope]->list, local_list) | |
368 | publ->node = tipc_own_addr; | |
945af1c3 | 369 | |
c4307285 | 370 | write_unlock_bh(&tipc_nametbl_lock); |
b97bf3fd | 371 | } |