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Commit | Line | Data |
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b97bf3fd | 1 | /* |
5b06c85c | 2 | * net/tipc/subscr.c: TIPC network topology service |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 2000-2006, Ericsson AB |
13a2e898 | 5 | * Copyright (c) 2005-2007, 2010-2013, 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 "name_table.h" |
5b06c85c | 39 | #include "subscr.h" |
b97bf3fd PL |
40 | |
41 | /** | |
11f99906 | 42 | * struct tipc_subscriber - TIPC network topology subscriber |
00bc00a9 | 43 | * @kref: reference counter to tipc_subscription object |
13a2e898 | 44 | * @conid: connection identifier to server connecting to subscriber |
963a1855 | 45 | * @lock: control access to subscriber |
57f1d186 | 46 | * @subscrp_list: list of subscription objects for this subscriber |
b97bf3fd | 47 | */ |
11f99906 | 48 | struct tipc_subscriber { |
00bc00a9 | 49 | struct kref kref; |
13a2e898 YX |
50 | int conid; |
51 | spinlock_t lock; | |
57f1d186 | 52 | struct list_head subscrp_list; |
b97bf3fd PL |
53 | }; |
54 | ||
00bc00a9 YX |
55 | static void tipc_subscrp_delete(struct tipc_subscription *sub); |
56 | static void tipc_subscrb_put(struct tipc_subscriber *subscriber); | |
d094c4d5 PB |
57 | static void tipc_subscrp_put(struct tipc_subscription *subscription); |
58 | static void tipc_subscrp_get(struct tipc_subscription *subscription); | |
00bc00a9 | 59 | |
db5a753b NH |
60 | /** |
61 | * htohl - convert value to endianness used by destination | |
62 | * @in: value to convert | |
63 | * @swap: non-zero if endianness must be reversed | |
64 | * | |
65 | * Returns converted value | |
66 | */ | |
db5a753b NH |
67 | static u32 htohl(u32 in, int swap) |
68 | { | |
69 | return swap ? swab32(in) : in; | |
70 | } | |
71 | ||
57f1d186 YX |
72 | static void tipc_subscrp_send_event(struct tipc_subscription *sub, |
73 | u32 found_lower, u32 found_upper, | |
74 | u32 event, u32 port_ref, u32 node) | |
b97bf3fd | 75 | { |
a62fbcce | 76 | struct tipc_net *tn = net_generic(sub->net, tipc_net_id); |
13a2e898 YX |
77 | struct tipc_subscriber *subscriber = sub->subscriber; |
78 | struct kvec msg_sect; | |
b97bf3fd PL |
79 | |
80 | msg_sect.iov_base = (void *)&sub->evt; | |
81 | msg_sect.iov_len = sizeof(struct tipc_event); | |
db5a753b NH |
82 | sub->evt.event = htohl(event, sub->swap); |
83 | sub->evt.found_lower = htohl(found_lower, sub->swap); | |
84 | sub->evt.found_upper = htohl(found_upper, sub->swap); | |
85 | sub->evt.port.ref = htohl(port_ref, sub->swap); | |
86 | sub->evt.port.node = htohl(node, sub->swap); | |
a62fbcce YX |
87 | tipc_conn_sendmsg(tn->topsrv, subscriber->conid, NULL, |
88 | msg_sect.iov_base, msg_sect.iov_len); | |
b97bf3fd PL |
89 | } |
90 | ||
91 | /** | |
57f1d186 YX |
92 | * tipc_subscrp_check_overlap - test for subscription overlap with the |
93 | * given values | |
b97bf3fd PL |
94 | * |
95 | * Returns 1 if there is overlap, otherwise 0. | |
96 | */ | |
a4273c73 | 97 | int tipc_subscrp_check_overlap(struct tipc_name_seq *seq, u32 found_lower, |
57f1d186 | 98 | u32 found_upper) |
b97bf3fd | 99 | { |
a4273c73 PB |
100 | if (found_lower < seq->lower) |
101 | found_lower = seq->lower; | |
102 | if (found_upper > seq->upper) | |
103 | found_upper = seq->upper; | |
b97bf3fd PL |
104 | if (found_lower > found_upper) |
105 | return 0; | |
106 | return 1; | |
107 | } | |
108 | ||
a4273c73 PB |
109 | u32 tipc_subscrp_convert_seq_type(u32 type, int swap) |
110 | { | |
111 | return htohl(type, swap); | |
112 | } | |
113 | ||
114 | void tipc_subscrp_convert_seq(struct tipc_name_seq *in, int swap, | |
115 | struct tipc_name_seq *out) | |
116 | { | |
117 | out->type = htohl(in->type, swap); | |
118 | out->lower = htohl(in->lower, swap); | |
119 | out->upper = htohl(in->upper, swap); | |
120 | } | |
121 | ||
57f1d186 YX |
122 | void tipc_subscrp_report_overlap(struct tipc_subscription *sub, u32 found_lower, |
123 | u32 found_upper, u32 event, u32 port_ref, | |
124 | u32 node, int must) | |
b97bf3fd | 125 | { |
a4273c73 PB |
126 | struct tipc_name_seq seq; |
127 | ||
d094c4d5 | 128 | tipc_subscrp_get(sub); |
a4273c73 PB |
129 | tipc_subscrp_convert_seq(&sub->evt.s.seq, sub->swap, &seq); |
130 | if (!tipc_subscrp_check_overlap(&seq, found_lower, found_upper)) | |
b97bf3fd | 131 | return; |
30865231 PB |
132 | if (!must && |
133 | !(htohl(sub->evt.s.filter, sub->swap) & TIPC_SUB_PORTS)) | |
b97bf3fd | 134 | return; |
e15f8804 | 135 | |
57f1d186 YX |
136 | tipc_subscrp_send_event(sub, found_lower, found_upper, event, port_ref, |
137 | node); | |
d094c4d5 | 138 | tipc_subscrp_put(sub); |
b97bf3fd PL |
139 | } |
140 | ||
57f1d186 | 141 | static void tipc_subscrp_timeout(unsigned long data) |
b97bf3fd | 142 | { |
2f55c437 | 143 | struct tipc_subscription *sub = (struct tipc_subscription *)data; |
557d054c YX |
144 | struct tipc_subscriber *subscriber = sub->subscriber; |
145 | ||
146 | spin_lock_bh(&subscriber->lock); | |
147 | tipc_nametbl_unsubscribe(sub); | |
148 | spin_unlock_bh(&subscriber->lock); | |
28353e7f AS |
149 | |
150 | /* Notify subscriber of timeout */ | |
57f1d186 YX |
151 | tipc_subscrp_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper, |
152 | TIPC_SUBSCR_TIMEOUT, 0, 0); | |
28353e7f | 153 | |
d094c4d5 | 154 | tipc_subscrp_put(sub); |
b97bf3fd PL |
155 | } |
156 | ||
00bc00a9 | 157 | static void tipc_subscrb_kref_release(struct kref *kref) |
eb409460 | 158 | { |
d094c4d5 | 159 | kfree(container_of(kref,struct tipc_subscriber, kref)); |
00bc00a9 YX |
160 | } |
161 | ||
162 | static void tipc_subscrb_put(struct tipc_subscriber *subscriber) | |
163 | { | |
164 | kref_put(&subscriber->kref, tipc_subscrb_kref_release); | |
165 | } | |
166 | ||
167 | static void tipc_subscrb_get(struct tipc_subscriber *subscriber) | |
168 | { | |
169 | kref_get(&subscriber->kref); | |
eb409460 LC |
170 | } |
171 | ||
d094c4d5 PB |
172 | static void tipc_subscrp_kref_release(struct kref *kref) |
173 | { | |
174 | struct tipc_subscription *sub = container_of(kref, | |
175 | struct tipc_subscription, | |
176 | kref); | |
177 | struct tipc_net *tn = net_generic(sub->net, tipc_net_id); | |
178 | struct tipc_subscriber *subscriber = sub->subscriber; | |
179 | ||
180 | spin_lock_bh(&subscriber->lock); | |
d094c4d5 PB |
181 | list_del(&sub->subscrp_list); |
182 | atomic_dec(&tn->subscription_count); | |
183 | spin_unlock_bh(&subscriber->lock); | |
184 | kfree(sub); | |
185 | tipc_subscrb_put(subscriber); | |
186 | } | |
187 | ||
188 | static void tipc_subscrp_put(struct tipc_subscription *subscription) | |
189 | { | |
190 | kref_put(&subscription->kref, tipc_subscrp_kref_release); | |
191 | } | |
192 | ||
193 | static void tipc_subscrp_get(struct tipc_subscription *subscription) | |
194 | { | |
195 | kref_get(&subscription->kref); | |
196 | } | |
197 | ||
198 | /* tipc_subscrb_subscrp_delete - delete a specific subscription or all | |
199 | * subscriptions for a given subscriber. | |
200 | */ | |
201 | static void tipc_subscrb_subscrp_delete(struct tipc_subscriber *subscriber, | |
202 | struct tipc_subscr *s) | |
203 | { | |
204 | struct list_head *subscription_list = &subscriber->subscrp_list; | |
205 | struct tipc_subscription *sub, *temp; | |
206 | ||
207 | spin_lock_bh(&subscriber->lock); | |
208 | list_for_each_entry_safe(sub, temp, subscription_list, subscrp_list) { | |
209 | if (s && memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) | |
210 | continue; | |
211 | ||
557d054c | 212 | tipc_nametbl_unsubscribe(sub); |
d094c4d5 PB |
213 | tipc_subscrp_get(sub); |
214 | spin_unlock_bh(&subscriber->lock); | |
215 | tipc_subscrp_delete(sub); | |
216 | tipc_subscrp_put(sub); | |
217 | spin_lock_bh(&subscriber->lock); | |
218 | ||
219 | if (s) | |
220 | break; | |
221 | } | |
222 | spin_unlock_bh(&subscriber->lock); | |
223 | } | |
224 | ||
1b764828 YX |
225 | static struct tipc_subscriber *tipc_subscrb_create(int conid) |
226 | { | |
227 | struct tipc_subscriber *subscriber; | |
228 | ||
229 | subscriber = kzalloc(sizeof(*subscriber), GFP_ATOMIC); | |
230 | if (!subscriber) { | |
231 | pr_warn("Subscriber rejected, no memory\n"); | |
232 | return NULL; | |
233 | } | |
234 | INIT_LIST_HEAD(&subscriber->subscrp_list); | |
d094c4d5 | 235 | kref_init(&subscriber->kref); |
1b764828 YX |
236 | subscriber->conid = conid; |
237 | spin_lock_init(&subscriber->lock); | |
238 | ||
239 | return subscriber; | |
240 | } | |
241 | ||
57f1d186 | 242 | static void tipc_subscrb_delete(struct tipc_subscriber *subscriber) |
13a2e898 | 243 | { |
d094c4d5 | 244 | tipc_subscrb_subscrp_delete(subscriber, NULL); |
00bc00a9 YX |
245 | tipc_subscrb_put(subscriber); |
246 | } | |
247 | ||
248 | static void tipc_subscrp_delete(struct tipc_subscription *sub) | |
249 | { | |
d094c4d5 | 250 | u32 timeout = htohl(sub->evt.s.timeout, sub->swap); |
00bc00a9 | 251 | |
d094c4d5 PB |
252 | if (timeout == TIPC_WAIT_FOREVER || del_timer(&sub->timer)) |
253 | tipc_subscrp_put(sub); | |
b97bf3fd PL |
254 | } |
255 | ||
57f1d186 YX |
256 | static void tipc_subscrp_cancel(struct tipc_subscr *s, |
257 | struct tipc_subscriber *subscriber) | |
eb409460 | 258 | { |
d094c4d5 | 259 | tipc_subscrb_subscrp_delete(subscriber, s); |
eb409460 LC |
260 | } |
261 | ||
7c13c622 PB |
262 | static struct tipc_subscription *tipc_subscrp_create(struct net *net, |
263 | struct tipc_subscr *s, | |
c8beccc6 | 264 | int swap) |
a62fbcce YX |
265 | { |
266 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
fead3909 | 267 | struct tipc_subscription *sub; |
c8beccc6 | 268 | u32 filter = htohl(s->filter, swap); |
eb409460 | 269 | |
b97bf3fd | 270 | /* Refuse subscription if global limit exceeded */ |
a62fbcce | 271 | if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) { |
2cf8aa19 | 272 | pr_warn("Subscription rejected, limit reached (%u)\n", |
34f256cc | 273 | TIPC_MAX_SUBSCRIPTIONS); |
7c13c622 | 274 | return NULL; |
b97bf3fd PL |
275 | } |
276 | ||
277 | /* Allocate subscription object */ | |
28353e7f | 278 | sub = kmalloc(sizeof(*sub), GFP_ATOMIC); |
a10bd924 | 279 | if (!sub) { |
2cf8aa19 | 280 | pr_warn("Subscription rejected, no memory\n"); |
7c13c622 | 281 | return NULL; |
b97bf3fd PL |
282 | } |
283 | ||
b97bf3fd | 284 | /* Initialize subscription object */ |
4ac1c8d0 | 285 | sub->net = net; |
30865231 | 286 | if (((filter & TIPC_SUB_PORTS) && (filter & TIPC_SUB_SERVICE)) || |
a4273c73 | 287 | (htohl(s->seq.lower, swap) > htohl(s->seq.upper, swap))) { |
2cf8aa19 | 288 | pr_warn("Subscription rejected, illegal request\n"); |
b97bf3fd | 289 | kfree(sub); |
7c13c622 | 290 | return NULL; |
b97bf3fd | 291 | } |
30865231 | 292 | |
db5a753b | 293 | sub->swap = swap; |
57f1d186 | 294 | memcpy(&sub->evt.s, s, sizeof(*s)); |
a62fbcce | 295 | atomic_inc(&tn->subscription_count); |
d094c4d5 | 296 | kref_init(&sub->kref); |
7c13c622 PB |
297 | return sub; |
298 | } | |
299 | ||
300 | static void tipc_subscrp_subscribe(struct net *net, struct tipc_subscr *s, | |
c8beccc6 | 301 | struct tipc_subscriber *subscriber, int swap) |
7c13c622 PB |
302 | { |
303 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
304 | struct tipc_subscription *sub = NULL; | |
305 | u32 timeout; | |
306 | ||
c8beccc6 | 307 | sub = tipc_subscrp_create(net, s, swap); |
7c13c622 PB |
308 | if (!sub) |
309 | return tipc_conn_terminate(tn->topsrv, subscriber->conid); | |
310 | ||
311 | spin_lock_bh(&subscriber->lock); | |
312 | list_add(&sub->subscrp_list, &subscriber->subscrp_list); | |
d4091899 PB |
313 | sub->subscriber = subscriber; |
314 | tipc_nametbl_subscribe(sub); | |
d094c4d5 | 315 | tipc_subscrb_get(subscriber); |
7c13c622 PB |
316 | spin_unlock_bh(&subscriber->lock); |
317 | ||
d094c4d5 | 318 | setup_timer(&sub->timer, tipc_subscrp_timeout, (unsigned long)sub); |
c8beccc6 | 319 | timeout = htohl(sub->evt.s.timeout, swap); |
ae245557 | 320 | |
d094c4d5 PB |
321 | if (timeout != TIPC_WAIT_FOREVER) |
322 | mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout)); | |
b97bf3fd PL |
323 | } |
324 | ||
13a2e898 | 325 | /* Handle one termination request for the subscriber */ |
333f7962 | 326 | static void tipc_subscrb_release_cb(int conid, void *usr_data) |
b97bf3fd | 327 | { |
57f1d186 | 328 | tipc_subscrb_delete((struct tipc_subscriber *)usr_data); |
b97bf3fd PL |
329 | } |
330 | ||
13a2e898 | 331 | /* Handle one request to create a new subscription for the subscriber */ |
57f1d186 YX |
332 | static void tipc_subscrb_rcv_cb(struct net *net, int conid, |
333 | struct sockaddr_tipc *addr, void *usr_data, | |
334 | void *buf, size_t len) | |
b97bf3fd | 335 | { |
c8beccc6 PB |
336 | struct tipc_subscriber *subscriber = usr_data; |
337 | struct tipc_subscr *s = (struct tipc_subscr *)buf; | |
338 | int swap; | |
339 | ||
340 | /* Determine subscriber's endianness */ | |
cb01c7c8 PB |
341 | swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE | |
342 | TIPC_SUB_CANCEL)); | |
c8beccc6 PB |
343 | |
344 | /* Detect & process a subscription cancellation request */ | |
345 | if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) { | |
346 | s->filter &= ~htohl(TIPC_SUB_CANCEL, swap); | |
347 | return tipc_subscrp_cancel(s, subscriber); | |
348 | } | |
349 | ||
b4358657 | 350 | tipc_subscrp_subscribe(net, s, subscriber, swap); |
b97bf3fd PL |
351 | } |
352 | ||
13a2e898 | 353 | /* Handle one request to establish a new subscriber */ |
57f1d186 | 354 | static void *tipc_subscrb_connect_cb(int conid) |
b97bf3fd | 355 | { |
1b764828 | 356 | return (void *)tipc_subscrb_create(conid); |
b97bf3fd PL |
357 | } |
358 | ||
57f1d186 | 359 | int tipc_topsrv_start(struct net *net) |
b97bf3fd | 360 | { |
a62fbcce YX |
361 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
362 | const char name[] = "topology_server"; | |
363 | struct tipc_server *topsrv; | |
364 | struct sockaddr_tipc *saddr; | |
365 | ||
366 | saddr = kzalloc(sizeof(*saddr), GFP_ATOMIC); | |
367 | if (!saddr) | |
368 | return -ENOMEM; | |
369 | saddr->family = AF_TIPC; | |
370 | saddr->addrtype = TIPC_ADDR_NAMESEQ; | |
371 | saddr->addr.nameseq.type = TIPC_TOP_SRV; | |
372 | saddr->addr.nameseq.lower = TIPC_TOP_SRV; | |
373 | saddr->addr.nameseq.upper = TIPC_TOP_SRV; | |
374 | saddr->scope = TIPC_NODE_SCOPE; | |
375 | ||
376 | topsrv = kzalloc(sizeof(*topsrv), GFP_ATOMIC); | |
377 | if (!topsrv) { | |
378 | kfree(saddr); | |
379 | return -ENOMEM; | |
380 | } | |
381 | topsrv->net = net; | |
382 | topsrv->saddr = saddr; | |
383 | topsrv->imp = TIPC_CRITICAL_IMPORTANCE; | |
384 | topsrv->type = SOCK_SEQPACKET; | |
385 | topsrv->max_rcvbuf_size = sizeof(struct tipc_subscr); | |
57f1d186 YX |
386 | topsrv->tipc_conn_recvmsg = tipc_subscrb_rcv_cb; |
387 | topsrv->tipc_conn_new = tipc_subscrb_connect_cb; | |
333f7962 | 388 | topsrv->tipc_conn_release = tipc_subscrb_release_cb; |
a62fbcce YX |
389 | |
390 | strncpy(topsrv->name, name, strlen(name) + 1); | |
391 | tn->topsrv = topsrv; | |
392 | atomic_set(&tn->subscription_count, 0); | |
393 | ||
394 | return tipc_server_start(topsrv); | |
b97bf3fd PL |
395 | } |
396 | ||
57f1d186 | 397 | void tipc_topsrv_stop(struct net *net) |
b97bf3fd | 398 | { |
a62fbcce YX |
399 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
400 | struct tipc_server *topsrv = tn->topsrv; | |
401 | ||
402 | tipc_server_stop(topsrv); | |
403 | kfree(topsrv->saddr); | |
404 | kfree(topsrv); | |
b97bf3fd | 405 | } |