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1 | /* |
2 | * net/tipc/name_distr.c: TIPC name distribution code | |
3 | * | |
4 | * Copyright (c) 2003-2005, Ericsson Research Canada | |
5 | * Copyright (c) 2005, Wind River Systems | |
6 | * Copyright (c) 2005-2006, Ericsson AB | |
7 | * All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions are met: | |
11 | * | |
12 | * Redistributions of source code must retain the above copyright notice, this | |
13 | * list of conditions and the following disclaimer. | |
14 | * Redistributions in binary form must reproduce the above copyright notice, | |
15 | * this list of conditions and the following disclaimer in the documentation | |
16 | * and/or other materials provided with the distribution. | |
17 | * Neither the names of the copyright holders nor the names of its | |
18 | * contributors may be used to endorse or promote products derived from this | |
19 | * software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
22 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
25 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
31 | * POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #include "core.h" | |
35 | #include "cluster.h" | |
36 | #include "dbg.h" | |
37 | #include "link.h" | |
38 | #include "msg.h" | |
39 | #include "name_distr.h" | |
40 | ||
41 | #undef DBG_OUTPUT | |
42 | #define DBG_OUTPUT NULL | |
43 | ||
44 | #define ITEM_SIZE sizeof(struct distr_item) | |
45 | ||
46 | /** | |
47 | * struct distr_item - publication info distributed to other nodes | |
48 | * @type: name sequence type | |
49 | * @lower: name sequence lower bound | |
50 | * @upper: name sequence upper bound | |
51 | * @ref: publishing port reference | |
52 | * @key: publication key | |
53 | * | |
54 | * ===> All fields are stored in network byte order. <=== | |
55 | * | |
56 | * First 3 fields identify (name or) name sequence being published. | |
57 | * Reference field uniquely identifies port that published name sequence. | |
58 | * Key field uniquely identifies publication, in the event a port has | |
59 | * multiple publications of the same name sequence. | |
60 | * | |
61 | * Note: There is no field that identifies the publishing node because it is | |
62 | * the same for all items contained within a publication message. | |
63 | */ | |
64 | ||
65 | struct distr_item { | |
66 | u32 type; | |
67 | u32 lower; | |
68 | u32 upper; | |
69 | u32 ref; | |
70 | u32 key; | |
71 | }; | |
72 | ||
73 | /** | |
74 | * List of externally visible publications by this node -- | |
75 | * that is, all publications having scope > TIPC_NODE_SCOPE. | |
76 | */ | |
77 | ||
78 | static LIST_HEAD(publ_root); | |
79 | static u32 publ_cnt = 0; | |
80 | ||
81 | /** | |
82 | * publ_to_item - add publication info to a publication message | |
83 | */ | |
84 | ||
85 | static void publ_to_item(struct distr_item *i, struct publication *p) | |
86 | { | |
87 | i->type = htonl(p->type); | |
88 | i->lower = htonl(p->lower); | |
89 | i->upper = htonl(p->upper); | |
90 | i->ref = htonl(p->ref); | |
91 | i->key = htonl(p->key); | |
92 | dbg("publ_to_item: %u, %u, %u\n", p->type, p->lower, p->upper); | |
93 | } | |
94 | ||
95 | /** | |
96 | * named_prepare_buf - allocate & initialize a publication message | |
97 | */ | |
98 | ||
99 | static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest) | |
100 | { | |
101 | struct sk_buff *buf = buf_acquire(LONG_H_SIZE + size); | |
102 | struct tipc_msg *msg; | |
103 | ||
104 | if (buf != NULL) { | |
105 | msg = buf_msg(buf); | |
106 | msg_init(msg, NAME_DISTRIBUTOR, type, TIPC_OK, | |
107 | LONG_H_SIZE, dest); | |
108 | msg_set_size(msg, LONG_H_SIZE + size); | |
109 | } | |
110 | return buf; | |
111 | } | |
112 | ||
113 | /** | |
114 | * named_publish - tell other nodes about a new publication by this node | |
115 | */ | |
116 | ||
117 | void named_publish(struct publication *publ) | |
118 | { | |
119 | struct sk_buff *buf; | |
120 | struct distr_item *item; | |
121 | ||
122 | list_add(&publ->local_list, &publ_root); | |
123 | publ_cnt++; | |
124 | ||
125 | buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0); | |
126 | if (!buf) { | |
127 | warn("Memory squeeze; failed to distribute publication\n"); | |
128 | return; | |
129 | } | |
130 | ||
131 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
132 | publ_to_item(item, publ); | |
133 | dbg("named_withdraw: broadcasting publish msg\n"); | |
134 | cluster_broadcast(buf); | |
135 | } | |
136 | ||
137 | /** | |
138 | * named_withdraw - tell other nodes about a withdrawn publication by this node | |
139 | */ | |
140 | ||
141 | void named_withdraw(struct publication *publ) | |
142 | { | |
143 | struct sk_buff *buf; | |
144 | struct distr_item *item; | |
145 | ||
146 | list_del(&publ->local_list); | |
147 | publ_cnt--; | |
148 | ||
149 | buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0); | |
150 | if (!buf) { | |
151 | warn("Memory squeeze; failed to distribute withdrawal\n"); | |
152 | return; | |
153 | } | |
154 | ||
155 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
156 | publ_to_item(item, publ); | |
157 | dbg("named_withdraw: broadcasting withdraw msg\n"); | |
158 | cluster_broadcast(buf); | |
159 | } | |
160 | ||
161 | /** | |
162 | * named_node_up - tell specified node about all publications by this node | |
163 | */ | |
164 | ||
165 | void named_node_up(unsigned long node) | |
166 | { | |
167 | struct publication *publ; | |
168 | struct distr_item *item = 0; | |
169 | struct sk_buff *buf = 0; | |
170 | u32 left = 0; | |
171 | u32 rest; | |
172 | u32 max_item_buf; | |
173 | ||
174 | assert(in_own_cluster(node)); | |
175 | read_lock_bh(&nametbl_lock); | |
176 | max_item_buf = TIPC_MAX_USER_MSG_SIZE / ITEM_SIZE; | |
177 | max_item_buf *= ITEM_SIZE; | |
178 | rest = publ_cnt * ITEM_SIZE; | |
179 | ||
180 | list_for_each_entry(publ, &publ_root, local_list) { | |
181 | if (!buf) { | |
182 | left = (rest <= max_item_buf) ? rest : max_item_buf; | |
183 | rest -= left; | |
184 | buf = named_prepare_buf(PUBLICATION, left, node); | |
185 | if (buf == NULL) { | |
186 | warn("Memory Squeeze; could not send publication\n"); | |
187 | goto exit; | |
188 | } | |
189 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
190 | } | |
191 | publ_to_item(item, publ); | |
192 | item++; | |
193 | left -= ITEM_SIZE; | |
194 | if (!left) { | |
195 | msg_set_link_selector(buf_msg(buf), node); | |
196 | dbg("named_node_up: sending publish msg to " | |
197 | "<%u.%u.%u>\n", tipc_zone(node), | |
198 | tipc_cluster(node), tipc_node(node)); | |
199 | link_send(buf, node, node); | |
200 | buf = 0; | |
201 | } | |
202 | } | |
203 | exit: | |
204 | read_unlock_bh(&nametbl_lock); | |
205 | } | |
206 | ||
207 | /** | |
208 | * node_is_down - remove publication associated with a failed node | |
209 | * | |
210 | * Invoked for each publication issued by a newly failed node. | |
211 | * Removes publication structure from name table & deletes it. | |
212 | * In rare cases the link may have come back up again when this | |
213 | * function is called, and we have two items representing the same | |
214 | * publication. Nudge this item's key to distinguish it from the other. | |
215 | * (Note: Publication's node subscription is already unsubscribed.) | |
216 | */ | |
217 | ||
218 | static void node_is_down(struct publication *publ) | |
219 | { | |
220 | struct publication *p; | |
221 | write_lock_bh(&nametbl_lock); | |
222 | dbg("node_is_down: withdrawing %u, %u, %u\n", | |
223 | publ->type, publ->lower, publ->upper); | |
224 | publ->key += 1222345; | |
225 | p = nametbl_remove_publ(publ->type, publ->lower, | |
226 | publ->node, publ->ref, publ->key); | |
227 | assert(p == publ); | |
228 | write_unlock_bh(&nametbl_lock); | |
229 | if (publ) | |
230 | kfree(publ); | |
231 | } | |
232 | ||
233 | /** | |
234 | * named_recv - process name table update message sent by another node | |
235 | */ | |
236 | ||
237 | void named_recv(struct sk_buff *buf) | |
238 | { | |
239 | struct publication *publ; | |
240 | struct tipc_msg *msg = buf_msg(buf); | |
241 | struct distr_item *item = (struct distr_item *)msg_data(msg); | |
242 | u32 count = msg_data_sz(msg) / ITEM_SIZE; | |
243 | ||
244 | write_lock_bh(&nametbl_lock); | |
245 | while (count--) { | |
246 | if (msg_type(msg) == PUBLICATION) { | |
247 | dbg("named_recv: got publication for %u, %u, %u\n", | |
248 | ntohl(item->type), ntohl(item->lower), | |
249 | ntohl(item->upper)); | |
250 | publ = nametbl_insert_publ(ntohl(item->type), | |
251 | ntohl(item->lower), | |
252 | ntohl(item->upper), | |
253 | TIPC_CLUSTER_SCOPE, | |
254 | msg_orignode(msg), | |
255 | ntohl(item->ref), | |
256 | ntohl(item->key)); | |
257 | if (publ) { | |
258 | nodesub_subscribe(&publ->subscr, | |
259 | msg_orignode(msg), | |
260 | publ, | |
261 | (net_ev_handler)node_is_down); | |
262 | } | |
263 | } else if (msg_type(msg) == WITHDRAWAL) { | |
264 | dbg("named_recv: got withdrawl for %u, %u, %u\n", | |
265 | ntohl(item->type), ntohl(item->lower), | |
266 | ntohl(item->upper)); | |
267 | publ = nametbl_remove_publ(ntohl(item->type), | |
268 | ntohl(item->lower), | |
269 | msg_orignode(msg), | |
270 | ntohl(item->ref), | |
271 | ntohl(item->key)); | |
272 | ||
273 | if (publ) { | |
274 | nodesub_unsubscribe(&publ->subscr); | |
275 | kfree(publ); | |
276 | } | |
277 | } else { | |
278 | warn("named_recv: unknown msg\n"); | |
279 | } | |
280 | item++; | |
281 | } | |
282 | write_unlock_bh(&nametbl_lock); | |
283 | buf_discard(buf); | |
284 | } | |
285 | ||
286 | /** | |
287 | * named_reinit - re-initialize local publication list | |
288 | * | |
289 | * This routine is called whenever TIPC networking is (re)enabled. | |
290 | * All existing publications by this node that have "cluster" or "zone" scope | |
291 | * are updated to reflect the node's current network address. | |
292 | * (If the node's address is unchanged, the update loop terminates immediately.) | |
293 | */ | |
294 | ||
295 | void named_reinit(void) | |
296 | { | |
297 | struct publication *publ; | |
298 | ||
299 | write_lock_bh(&nametbl_lock); | |
300 | list_for_each_entry(publ, &publ_root, local_list) { | |
301 | if (publ->node == tipc_own_addr) | |
302 | break; | |
303 | publ->node = tipc_own_addr; | |
304 | } | |
305 | write_unlock_bh(&nametbl_lock); | |
306 | } |