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 | 41 | /** |
3f8375fe AS |
42 | * struct publ_list - list of publications made by this node |
43 | * @list: circular list of publications | |
44 | * @list_size: number of entries in list | |
b97bf3fd | 45 | */ |
3f8375fe AS |
46 | struct publ_list { |
47 | struct list_head list; | |
48 | u32 size; | |
49 | }; | |
b97bf3fd | 50 | |
a909804f AS |
51 | static struct publ_list publ_zone = { |
52 | .list = LIST_HEAD_INIT(publ_zone.list), | |
53 | .size = 0, | |
54 | }; | |
55 | ||
3f8375fe AS |
56 | static struct publ_list publ_cluster = { |
57 | .list = LIST_HEAD_INIT(publ_cluster.list), | |
58 | .size = 0, | |
59 | }; | |
b97bf3fd | 60 | |
a909804f AS |
61 | static struct publ_list publ_node = { |
62 | .list = LIST_HEAD_INIT(publ_node.list), | |
63 | .size = 0, | |
64 | }; | |
65 | ||
66 | static struct publ_list *publ_lists[] = { | |
67 | NULL, | |
68 | &publ_zone, /* publ_lists[TIPC_ZONE_SCOPE] */ | |
69 | &publ_cluster, /* publ_lists[TIPC_CLUSTER_SCOPE] */ | |
70 | &publ_node /* publ_lists[TIPC_NODE_SCOPE] */ | |
71 | }; | |
72 | ||
73 | ||
b97bf3fd PL |
74 | /** |
75 | * publ_to_item - add publication info to a publication message | |
76 | */ | |
b97bf3fd PL |
77 | static void publ_to_item(struct distr_item *i, struct publication *p) |
78 | { | |
79 | i->type = htonl(p->type); | |
80 | i->lower = htonl(p->lower); | |
81 | i->upper = htonl(p->upper); | |
82 | i->ref = htonl(p->ref); | |
83 | i->key = htonl(p->key); | |
b97bf3fd PL |
84 | } |
85 | ||
86 | /** | |
87 | * named_prepare_buf - allocate & initialize a publication message | |
88 | */ | |
b97bf3fd PL |
89 | static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest) |
90 | { | |
741d9eb7 | 91 | struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size); |
b97bf3fd PL |
92 | struct tipc_msg *msg; |
93 | ||
94 | if (buf != NULL) { | |
95 | msg = buf_msg(buf); | |
741d9eb7 AS |
96 | tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest); |
97 | msg_set_size(msg, INT_H_SIZE + size); | |
b97bf3fd PL |
98 | } |
99 | return buf; | |
100 | } | |
101 | ||
eab8c045 | 102 | void named_cluster_distribute(struct sk_buff *buf) |
8f92df6a AS |
103 | { |
104 | struct sk_buff *buf_copy; | |
105 | struct tipc_node *n_ptr; | |
78dfb789 | 106 | struct tipc_link *l_ptr; |
8f92df6a | 107 | |
6c7a762e YX |
108 | rcu_read_lock(); |
109 | list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) { | |
5356f3d7 | 110 | tipc_node_lock(n_ptr); |
78dfb789 YX |
111 | l_ptr = n_ptr->active_links[n_ptr->addr & 1]; |
112 | if (l_ptr) { | |
8f92df6a | 113 | buf_copy = skb_copy(buf, GFP_ATOMIC); |
78dfb789 | 114 | if (!buf_copy) { |
5356f3d7 | 115 | tipc_node_unlock(n_ptr); |
8f92df6a | 116 | break; |
78dfb789 | 117 | } |
8f92df6a | 118 | msg_set_destnode(buf_msg(buf_copy), n_ptr->addr); |
78dfb789 | 119 | __tipc_link_xmit(l_ptr, buf_copy); |
8f92df6a | 120 | } |
5356f3d7 | 121 | tipc_node_unlock(n_ptr); |
8f92df6a | 122 | } |
6c7a762e | 123 | rcu_read_unlock(); |
8f92df6a | 124 | |
5f6d9123 | 125 | kfree_skb(buf); |
8f92df6a AS |
126 | } |
127 | ||
b97bf3fd | 128 | /** |
4323add6 | 129 | * tipc_named_publish - tell other nodes about a new publication by this node |
b97bf3fd | 130 | */ |
eab8c045 | 131 | struct sk_buff *tipc_named_publish(struct publication *publ) |
b97bf3fd PL |
132 | { |
133 | struct sk_buff *buf; | |
134 | struct distr_item *item; | |
135 | ||
a909804f AS |
136 | list_add_tail(&publ->local_list, &publ_lists[publ->scope]->list); |
137 | publ_lists[publ->scope]->size++; | |
b97bf3fd | 138 | |
1110b8d3 | 139 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 140 | return NULL; |
1110b8d3 | 141 | |
b97bf3fd PL |
142 | buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0); |
143 | if (!buf) { | |
2cf8aa19 | 144 | pr_warn("Publication distribution failure\n"); |
eab8c045 | 145 | return NULL; |
b97bf3fd PL |
146 | } |
147 | ||
148 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
149 | publ_to_item(item, publ); | |
eab8c045 | 150 | return buf; |
b97bf3fd PL |
151 | } |
152 | ||
153 | /** | |
4323add6 | 154 | * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
b97bf3fd | 155 | */ |
eab8c045 | 156 | struct sk_buff *tipc_named_withdraw(struct publication *publ) |
b97bf3fd PL |
157 | { |
158 | struct sk_buff *buf; | |
159 | struct distr_item *item; | |
160 | ||
161 | list_del(&publ->local_list); | |
a909804f | 162 | publ_lists[publ->scope]->size--; |
b97bf3fd | 163 | |
1110b8d3 | 164 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 165 | return NULL; |
1110b8d3 | 166 | |
b97bf3fd PL |
167 | buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0); |
168 | if (!buf) { | |
2cf8aa19 | 169 | pr_warn("Withdrawal distribution failure\n"); |
eab8c045 | 170 | return NULL; |
b97bf3fd PL |
171 | } |
172 | ||
173 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
174 | publ_to_item(item, publ); | |
eab8c045 | 175 | return buf; |
b97bf3fd PL |
176 | } |
177 | ||
e11aa059 AS |
178 | /* |
179 | * named_distribute - prepare name info for bulk distribution to another node | |
180 | */ | |
181 | static void named_distribute(struct list_head *message_list, u32 node, | |
182 | struct publ_list *pls, u32 max_item_buf) | |
183 | { | |
184 | struct publication *publ; | |
185 | struct sk_buff *buf = NULL; | |
186 | struct distr_item *item = NULL; | |
187 | u32 left = 0; | |
188 | u32 rest = pls->size * ITEM_SIZE; | |
189 | ||
190 | list_for_each_entry(publ, &pls->list, local_list) { | |
191 | if (!buf) { | |
192 | left = (rest <= max_item_buf) ? rest : max_item_buf; | |
193 | rest -= left; | |
194 | buf = named_prepare_buf(PUBLICATION, left, node); | |
195 | if (!buf) { | |
2cf8aa19 | 196 | pr_warn("Bulk publication failure\n"); |
e11aa059 AS |
197 | return; |
198 | } | |
199 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
200 | } | |
201 | publ_to_item(item, publ); | |
202 | item++; | |
203 | left -= ITEM_SIZE; | |
204 | if (!left) { | |
205 | list_add_tail((struct list_head *)buf, message_list); | |
206 | buf = NULL; | |
207 | } | |
208 | } | |
209 | } | |
210 | ||
b97bf3fd | 211 | /** |
4323add6 | 212 | * tipc_named_node_up - tell specified node about all publications by this node |
b97bf3fd | 213 | */ |
ca0c4273 | 214 | void tipc_named_node_up(u32 max_item_buf, u32 node) |
b97bf3fd | 215 | { |
ca0c4273 | 216 | LIST_HEAD(message_list); |
9aa88c2a | 217 | |
c4307285 | 218 | read_lock_bh(&tipc_nametbl_lock); |
e11aa059 | 219 | named_distribute(&message_list, node, &publ_cluster, max_item_buf); |
a909804f | 220 | named_distribute(&message_list, node, &publ_zone, max_item_buf); |
c4307285 | 221 | read_unlock_bh(&tipc_nametbl_lock); |
9aa88c2a | 222 | |
247f0f3c | 223 | tipc_link_names_xmit(&message_list, node); |
b97bf3fd PL |
224 | } |
225 | ||
226 | /** | |
f1379173 | 227 | * named_purge_publ - remove publication associated with a failed node |
c4307285 YH |
228 | * |
229 | * Invoked for each publication issued by a newly failed node. | |
b97bf3fd | 230 | * Removes publication structure from name table & deletes it. |
b97bf3fd | 231 | */ |
f1379173 | 232 | static void named_purge_publ(struct publication *publ) |
b97bf3fd PL |
233 | { |
234 | struct publication *p; | |
f131072c | 235 | |
c4307285 | 236 | write_lock_bh(&tipc_nametbl_lock); |
c4307285 | 237 | p = tipc_nametbl_remove_publ(publ->type, publ->lower, |
4323add6 | 238 | publ->node, publ->ref, publ->key); |
431697eb AS |
239 | if (p) |
240 | tipc_nodesub_unsubscribe(&p->subscr); | |
4323add6 | 241 | write_unlock_bh(&tipc_nametbl_lock); |
f131072c | 242 | |
c4307285 | 243 | if (p != publ) { |
2cf8aa19 EH |
244 | pr_err("Unable to remove publication from failed node\n" |
245 | " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n", | |
246 | publ->type, publ->lower, publ->node, publ->ref, | |
247 | publ->key); | |
f131072c AS |
248 | } |
249 | ||
e83504f7 | 250 | kfree(p); |
b97bf3fd PL |
251 | } |
252 | ||
253 | /** | |
247f0f3c | 254 | * tipc_named_rcv - process name table update message sent by another node |
b97bf3fd | 255 | */ |
247f0f3c | 256 | void tipc_named_rcv(struct sk_buff *buf) |
b97bf3fd PL |
257 | { |
258 | struct publication *publ; | |
259 | struct tipc_msg *msg = buf_msg(buf); | |
260 | struct distr_item *item = (struct distr_item *)msg_data(msg); | |
261 | u32 count = msg_data_sz(msg) / ITEM_SIZE; | |
262 | ||
c4307285 | 263 | write_lock_bh(&tipc_nametbl_lock); |
b97bf3fd PL |
264 | while (count--) { |
265 | if (msg_type(msg) == PUBLICATION) { | |
c4307285 | 266 | publ = tipc_nametbl_insert_publ(ntohl(item->type), |
4323add6 PL |
267 | ntohl(item->lower), |
268 | ntohl(item->upper), | |
269 | TIPC_CLUSTER_SCOPE, | |
c4307285 | 270 | msg_orignode(msg), |
4323add6 PL |
271 | ntohl(item->ref), |
272 | ntohl(item->key)); | |
b97bf3fd | 273 | if (publ) { |
c4307285 YH |
274 | tipc_nodesub_subscribe(&publ->subscr, |
275 | msg_orignode(msg), | |
4323add6 | 276 | publ, |
f1379173 AS |
277 | (net_ev_handler) |
278 | named_purge_publ); | |
b97bf3fd PL |
279 | } |
280 | } else if (msg_type(msg) == WITHDRAWAL) { | |
4323add6 PL |
281 | publ = tipc_nametbl_remove_publ(ntohl(item->type), |
282 | ntohl(item->lower), | |
283 | msg_orignode(msg), | |
284 | ntohl(item->ref), | |
285 | ntohl(item->key)); | |
b97bf3fd PL |
286 | |
287 | if (publ) { | |
4323add6 | 288 | tipc_nodesub_unsubscribe(&publ->subscr); |
c4307285 | 289 | kfree(publ); |
f131072c | 290 | } else { |
2cf8aa19 EH |
291 | pr_err("Unable to remove publication by node 0x%x\n" |
292 | " (type=%u, lower=%u, ref=%u, key=%u)\n", | |
293 | msg_orignode(msg), ntohl(item->type), | |
294 | ntohl(item->lower), ntohl(item->ref), | |
295 | ntohl(item->key)); | |
b97bf3fd PL |
296 | } |
297 | } else { | |
2cf8aa19 | 298 | pr_warn("Unrecognized name table message received\n"); |
b97bf3fd PL |
299 | } |
300 | item++; | |
301 | } | |
c4307285 | 302 | write_unlock_bh(&tipc_nametbl_lock); |
5f6d9123 | 303 | kfree_skb(buf); |
b97bf3fd PL |
304 | } |
305 | ||
306 | /** | |
1110b8d3 | 307 | * tipc_named_reinit - re-initialize local publications |
c4307285 | 308 | * |
945af1c3 | 309 | * This routine is called whenever TIPC networking is enabled. |
1110b8d3 AS |
310 | * All name table entries published by this node are updated to reflect |
311 | * the node's new network address. | |
b97bf3fd | 312 | */ |
4323add6 | 313 | void tipc_named_reinit(void) |
b97bf3fd PL |
314 | { |
315 | struct publication *publ; | |
a909804f | 316 | int scope; |
b97bf3fd | 317 | |
c4307285 | 318 | write_lock_bh(&tipc_nametbl_lock); |
945af1c3 | 319 | |
1110b8d3 | 320 | for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++) |
a909804f AS |
321 | list_for_each_entry(publ, &publ_lists[scope]->list, local_list) |
322 | publ->node = tipc_own_addr; | |
945af1c3 | 323 | |
c4307285 | 324 | write_unlock_bh(&tipc_nametbl_lock); |
b97bf3fd | 325 | } |