Commit | Line | Data |
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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 | /** | |
c4307285 | 71 | * List of externally visible publications by this node -- |
b97bf3fd PL |
72 | * that is, all publications having scope > TIPC_NODE_SCOPE. |
73 | */ | |
74 | ||
75 | static LIST_HEAD(publ_root); | |
e3ec9c7d | 76 | static u32 publ_cnt; |
b97bf3fd PL |
77 | |
78 | /** | |
79 | * publ_to_item - add publication info to a publication message | |
80 | */ | |
81 | ||
82 | static void publ_to_item(struct distr_item *i, struct publication *p) | |
83 | { | |
84 | i->type = htonl(p->type); | |
85 | i->lower = htonl(p->lower); | |
86 | i->upper = htonl(p->upper); | |
87 | i->ref = htonl(p->ref); | |
88 | i->key = htonl(p->key); | |
b97bf3fd PL |
89 | } |
90 | ||
91 | /** | |
92 | * named_prepare_buf - allocate & initialize a publication message | |
93 | */ | |
94 | ||
95 | static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest) | |
96 | { | |
741d9eb7 | 97 | struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size); |
b97bf3fd PL |
98 | struct tipc_msg *msg; |
99 | ||
100 | if (buf != NULL) { | |
101 | msg = buf_msg(buf); | |
741d9eb7 AS |
102 | tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest); |
103 | msg_set_size(msg, INT_H_SIZE + size); | |
b97bf3fd PL |
104 | } |
105 | return buf; | |
106 | } | |
107 | ||
8f92df6a AS |
108 | static void named_cluster_distribute(struct sk_buff *buf) |
109 | { | |
110 | struct sk_buff *buf_copy; | |
111 | struct tipc_node *n_ptr; | |
8f92df6a | 112 | |
672d99e1 | 113 | list_for_each_entry(n_ptr, &tipc_node_list, list) { |
8f19afb2 | 114 | if (tipc_node_active_links(n_ptr)) { |
8f92df6a AS |
115 | buf_copy = skb_copy(buf, GFP_ATOMIC); |
116 | if (!buf_copy) | |
117 | break; | |
118 | msg_set_destnode(buf_msg(buf_copy), n_ptr->addr); | |
119 | tipc_link_send(buf_copy, n_ptr->addr, n_ptr->addr); | |
120 | } | |
121 | } | |
122 | ||
123 | buf_discard(buf); | |
124 | } | |
125 | ||
b97bf3fd | 126 | /** |
4323add6 | 127 | * tipc_named_publish - tell other nodes about a new publication by this node |
b97bf3fd PL |
128 | */ |
129 | ||
4323add6 | 130 | void tipc_named_publish(struct publication *publ) |
b97bf3fd PL |
131 | { |
132 | struct sk_buff *buf; | |
133 | struct distr_item *item; | |
134 | ||
08c31f71 | 135 | list_add_tail(&publ->local_list, &publ_root); |
b97bf3fd PL |
136 | publ_cnt++; |
137 | ||
138 | buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0); | |
139 | if (!buf) { | |
a10bd924 | 140 | warn("Publication distribution failure\n"); |
b97bf3fd PL |
141 | return; |
142 | } | |
143 | ||
144 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
145 | publ_to_item(item, publ); | |
8f92df6a | 146 | named_cluster_distribute(buf); |
b97bf3fd PL |
147 | } |
148 | ||
149 | /** | |
4323add6 | 150 | * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
b97bf3fd PL |
151 | */ |
152 | ||
4323add6 | 153 | void tipc_named_withdraw(struct publication *publ) |
b97bf3fd PL |
154 | { |
155 | struct sk_buff *buf; | |
156 | struct distr_item *item; | |
157 | ||
158 | list_del(&publ->local_list); | |
159 | publ_cnt--; | |
160 | ||
161 | buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0); | |
162 | if (!buf) { | |
25985edc | 163 | warn("Withdrawal distribution failure\n"); |
b97bf3fd PL |
164 | return; |
165 | } | |
166 | ||
167 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
168 | publ_to_item(item, publ); | |
8f92df6a | 169 | named_cluster_distribute(buf); |
b97bf3fd PL |
170 | } |
171 | ||
172 | /** | |
4323add6 | 173 | * tipc_named_node_up - tell specified node about all publications by this node |
b97bf3fd PL |
174 | */ |
175 | ||
4323add6 | 176 | void tipc_named_node_up(unsigned long node) |
b97bf3fd | 177 | { |
149ce37c AS |
178 | struct tipc_node *n_ptr; |
179 | struct link *l_ptr; | |
b97bf3fd | 180 | struct publication *publ; |
1fc54d8f SR |
181 | struct distr_item *item = NULL; |
182 | struct sk_buff *buf = NULL; | |
b97bf3fd PL |
183 | u32 left = 0; |
184 | u32 rest; | |
149ce37c AS |
185 | u32 max_item_buf = 0; |
186 | ||
187 | /* compute maximum amount of publication data to send per message */ | |
188 | ||
189 | read_lock_bh(&tipc_net_lock); | |
190 | n_ptr = tipc_node_find((u32)node); | |
191 | if (n_ptr) { | |
192 | tipc_node_lock(n_ptr); | |
193 | l_ptr = n_ptr->active_links[0]; | |
194 | if (l_ptr) | |
195 | max_item_buf = ((l_ptr->max_pkt - INT_H_SIZE) / | |
196 | ITEM_SIZE) * ITEM_SIZE; | |
197 | tipc_node_unlock(n_ptr); | |
198 | } | |
199 | read_unlock_bh(&tipc_net_lock); | |
200 | if (!max_item_buf) | |
201 | return; | |
b97bf3fd | 202 | |
c4307285 | 203 | read_lock_bh(&tipc_nametbl_lock); |
b97bf3fd PL |
204 | rest = publ_cnt * ITEM_SIZE; |
205 | ||
206 | list_for_each_entry(publ, &publ_root, local_list) { | |
207 | if (!buf) { | |
208 | left = (rest <= max_item_buf) ? rest : max_item_buf; | |
209 | rest -= left; | |
c4307285 | 210 | buf = named_prepare_buf(PUBLICATION, left, node); |
a10bd924 AS |
211 | if (!buf) { |
212 | warn("Bulk publication distribution failure\n"); | |
b97bf3fd PL |
213 | goto exit; |
214 | } | |
215 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
216 | } | |
217 | publ_to_item(item, publ); | |
218 | item++; | |
219 | left -= ITEM_SIZE; | |
220 | if (!left) { | |
221 | msg_set_link_selector(buf_msg(buf), node); | |
4323add6 | 222 | tipc_link_send(buf, node, node); |
1fc54d8f | 223 | buf = NULL; |
b97bf3fd PL |
224 | } |
225 | } | |
226 | exit: | |
c4307285 | 227 | read_unlock_bh(&tipc_nametbl_lock); |
b97bf3fd PL |
228 | } |
229 | ||
230 | /** | |
f1379173 | 231 | * named_purge_publ - remove publication associated with a failed node |
c4307285 YH |
232 | * |
233 | * Invoked for each publication issued by a newly failed node. | |
b97bf3fd PL |
234 | * Removes publication structure from name table & deletes it. |
235 | * In rare cases the link may have come back up again when this | |
236 | * function is called, and we have two items representing the same | |
237 | * publication. Nudge this item's key to distinguish it from the other. | |
b97bf3fd PL |
238 | */ |
239 | ||
f1379173 | 240 | static void named_purge_publ(struct publication *publ) |
b97bf3fd PL |
241 | { |
242 | struct publication *p; | |
f131072c | 243 | |
c4307285 | 244 | write_lock_bh(&tipc_nametbl_lock); |
c4307285 YH |
245 | publ->key += 1222345; |
246 | p = tipc_nametbl_remove_publ(publ->type, publ->lower, | |
4323add6 | 247 | publ->node, publ->ref, publ->key); |
431697eb AS |
248 | if (p) |
249 | tipc_nodesub_unsubscribe(&p->subscr); | |
4323add6 | 250 | write_unlock_bh(&tipc_nametbl_lock); |
f131072c | 251 | |
c4307285 | 252 | if (p != publ) { |
f131072c AS |
253 | err("Unable to remove publication from failed node\n" |
254 | "(type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n", | |
255 | publ->type, publ->lower, publ->node, publ->ref, publ->key); | |
256 | } | |
257 | ||
e83504f7 | 258 | kfree(p); |
b97bf3fd PL |
259 | } |
260 | ||
261 | /** | |
4323add6 | 262 | * tipc_named_recv - process name table update message sent by another node |
b97bf3fd PL |
263 | */ |
264 | ||
4323add6 | 265 | void tipc_named_recv(struct sk_buff *buf) |
b97bf3fd PL |
266 | { |
267 | struct publication *publ; | |
268 | struct tipc_msg *msg = buf_msg(buf); | |
269 | struct distr_item *item = (struct distr_item *)msg_data(msg); | |
270 | u32 count = msg_data_sz(msg) / ITEM_SIZE; | |
271 | ||
c4307285 | 272 | write_lock_bh(&tipc_nametbl_lock); |
b97bf3fd PL |
273 | while (count--) { |
274 | if (msg_type(msg) == PUBLICATION) { | |
c4307285 | 275 | publ = tipc_nametbl_insert_publ(ntohl(item->type), |
4323add6 PL |
276 | ntohl(item->lower), |
277 | ntohl(item->upper), | |
278 | TIPC_CLUSTER_SCOPE, | |
c4307285 | 279 | msg_orignode(msg), |
4323add6 PL |
280 | ntohl(item->ref), |
281 | ntohl(item->key)); | |
b97bf3fd | 282 | if (publ) { |
c4307285 YH |
283 | tipc_nodesub_subscribe(&publ->subscr, |
284 | msg_orignode(msg), | |
4323add6 | 285 | publ, |
f1379173 AS |
286 | (net_ev_handler) |
287 | named_purge_publ); | |
b97bf3fd PL |
288 | } |
289 | } else if (msg_type(msg) == WITHDRAWAL) { | |
4323add6 PL |
290 | publ = tipc_nametbl_remove_publ(ntohl(item->type), |
291 | ntohl(item->lower), | |
292 | msg_orignode(msg), | |
293 | ntohl(item->ref), | |
294 | ntohl(item->key)); | |
b97bf3fd PL |
295 | |
296 | if (publ) { | |
4323add6 | 297 | tipc_nodesub_unsubscribe(&publ->subscr); |
c4307285 | 298 | kfree(publ); |
f131072c AS |
299 | } else { |
300 | err("Unable to remove publication by node 0x%x\n" | |
301 | "(type=%u, lower=%u, ref=%u, key=%u)\n", | |
302 | msg_orignode(msg), | |
303 | ntohl(item->type), ntohl(item->lower), | |
304 | ntohl(item->ref), ntohl(item->key)); | |
b97bf3fd PL |
305 | } |
306 | } else { | |
a10bd924 | 307 | warn("Unrecognized name table message received\n"); |
b97bf3fd PL |
308 | } |
309 | item++; | |
310 | } | |
c4307285 | 311 | write_unlock_bh(&tipc_nametbl_lock); |
b97bf3fd PL |
312 | buf_discard(buf); |
313 | } | |
314 | ||
315 | /** | |
4323add6 | 316 | * tipc_named_reinit - re-initialize local publication list |
c4307285 | 317 | * |
b97bf3fd PL |
318 | * This routine is called whenever TIPC networking is (re)enabled. |
319 | * All existing publications by this node that have "cluster" or "zone" scope | |
320 | * are updated to reflect the node's current network address. | |
321 | * (If the node's address is unchanged, the update loop terminates immediately.) | |
322 | */ | |
323 | ||
4323add6 | 324 | void tipc_named_reinit(void) |
b97bf3fd PL |
325 | { |
326 | struct publication *publ; | |
327 | ||
c4307285 | 328 | write_lock_bh(&tipc_nametbl_lock); |
b97bf3fd PL |
329 | list_for_each_entry(publ, &publ_root, local_list) { |
330 | if (publ->node == tipc_own_addr) | |
331 | break; | |
332 | publ->node = tipc_own_addr; | |
333 | } | |
c4307285 | 334 | write_unlock_bh(&tipc_nametbl_lock); |
b97bf3fd | 335 | } |