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TOMOYO Linux Cross Reference
Linux/net/tipc/subscr.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * net/tipc/subscr.c: TIPC network topology service
  3  *
  4  * Copyright (c) 2000-2006, Ericsson AB
  5  * Copyright (c) 2005-2007, 2010-2013, Wind River Systems
  6  * All rights reserved.
  7  *
  8  * Redistribution and use in source and binary forms, with or without
  9  * modification, are permitted provided that the following conditions are met:
 10  *
 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.
 19  *
 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
 34  * POSSIBILITY OF SUCH DAMAGE.
 35  */
 36 
 37 #include "core.h"
 38 #include "name_table.h"
 39 #include "subscr.h"
 40 
 41 /**
 42  * struct tipc_subscriber - TIPC network topology subscriber
 43  * @kref: reference counter to tipc_subscription object
 44  * @conid: connection identifier to server connecting to subscriber
 45  * @lock: control access to subscriber
 46  * @subscrp_list: list of subscription objects for this subscriber
 47  */
 48 struct tipc_subscriber {
 49         struct kref kref;
 50         int conid;
 51         spinlock_t lock;
 52         struct list_head subscrp_list;
 53 };
 54 
 55 static void tipc_subscrp_delete(struct tipc_subscription *sub);
 56 static void tipc_subscrb_put(struct tipc_subscriber *subscriber);
 57 
 58 /**
 59  * htohl - convert value to endianness used by destination
 60  * @in: value to convert
 61  * @swap: non-zero if endianness must be reversed
 62  *
 63  * Returns converted value
 64  */
 65 static u32 htohl(u32 in, int swap)
 66 {
 67         return swap ? swab32(in) : in;
 68 }
 69 
 70 static void tipc_subscrp_send_event(struct tipc_subscription *sub,
 71                                     u32 found_lower, u32 found_upper,
 72                                     u32 event, u32 port_ref, u32 node)
 73 {
 74         struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
 75         struct tipc_subscriber *subscriber = sub->subscriber;
 76         struct kvec msg_sect;
 77 
 78         msg_sect.iov_base = (void *)&sub->evt;
 79         msg_sect.iov_len = sizeof(struct tipc_event);
 80         sub->evt.event = htohl(event, sub->swap);
 81         sub->evt.found_lower = htohl(found_lower, sub->swap);
 82         sub->evt.found_upper = htohl(found_upper, sub->swap);
 83         sub->evt.port.ref = htohl(port_ref, sub->swap);
 84         sub->evt.port.node = htohl(node, sub->swap);
 85         tipc_conn_sendmsg(tn->topsrv, subscriber->conid, NULL,
 86                           msg_sect.iov_base, msg_sect.iov_len);
 87 }
 88 
 89 /**
 90  * tipc_subscrp_check_overlap - test for subscription overlap with the
 91  * given values
 92  *
 93  * Returns 1 if there is overlap, otherwise 0.
 94  */
 95 int tipc_subscrp_check_overlap(struct tipc_name_seq *seq, u32 found_lower,
 96                                u32 found_upper)
 97 {
 98         if (found_lower < seq->lower)
 99                 found_lower = seq->lower;
100         if (found_upper > seq->upper)
101                 found_upper = seq->upper;
102         if (found_lower > found_upper)
103                 return 0;
104         return 1;
105 }
106 
107 u32 tipc_subscrp_convert_seq_type(u32 type, int swap)
108 {
109         return htohl(type, swap);
110 }
111 
112 void tipc_subscrp_convert_seq(struct tipc_name_seq *in, int swap,
113                               struct tipc_name_seq *out)
114 {
115         out->type = htohl(in->type, swap);
116         out->lower = htohl(in->lower, swap);
117         out->upper = htohl(in->upper, swap);
118 }
119 
120 void tipc_subscrp_report_overlap(struct tipc_subscription *sub, u32 found_lower,
121                                  u32 found_upper, u32 event, u32 port_ref,
122                                  u32 node, int must)
123 {
124         struct tipc_name_seq seq;
125 
126         tipc_subscrp_convert_seq(&sub->evt.s.seq, sub->swap, &seq);
127         if (!tipc_subscrp_check_overlap(&seq, found_lower, found_upper))
128                 return;
129         if (!must &&
130             !(htohl(sub->evt.s.filter, sub->swap) & TIPC_SUB_PORTS))
131                 return;
132 
133         tipc_subscrp_send_event(sub, found_lower, found_upper, event, port_ref,
134                                 node);
135 }
136 
137 static void tipc_subscrp_timeout(unsigned long data)
138 {
139         struct tipc_subscription *sub = (struct tipc_subscription *)data;
140         struct tipc_subscriber *subscriber = sub->subscriber;
141 
142         /* Notify subscriber of timeout */
143         tipc_subscrp_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
144                                 TIPC_SUBSCR_TIMEOUT, 0, 0);
145 
146         spin_lock_bh(&subscriber->lock);
147         tipc_subscrp_delete(sub);
148         spin_unlock_bh(&subscriber->lock);
149 
150         tipc_subscrb_put(subscriber);
151 }
152 
153 static void tipc_subscrb_kref_release(struct kref *kref)
154 {
155         struct tipc_subscriber *subcriber = container_of(kref,
156                                             struct tipc_subscriber, kref);
157 
158         kfree(subcriber);
159 }
160 
161 static void tipc_subscrb_put(struct tipc_subscriber *subscriber)
162 {
163         kref_put(&subscriber->kref, tipc_subscrb_kref_release);
164 }
165 
166 static void tipc_subscrb_get(struct tipc_subscriber *subscriber)
167 {
168         kref_get(&subscriber->kref);
169 }
170 
171 static struct tipc_subscriber *tipc_subscrb_create(int conid)
172 {
173         struct tipc_subscriber *subscriber;
174 
175         subscriber = kzalloc(sizeof(*subscriber), GFP_ATOMIC);
176         if (!subscriber) {
177                 pr_warn("Subscriber rejected, no memory\n");
178                 return NULL;
179         }
180         kref_init(&subscriber->kref);
181         INIT_LIST_HEAD(&subscriber->subscrp_list);
182         subscriber->conid = conid;
183         spin_lock_init(&subscriber->lock);
184 
185         return subscriber;
186 }
187 
188 static void tipc_subscrb_delete(struct tipc_subscriber *subscriber)
189 {
190         struct tipc_subscription *sub, *temp;
191         u32 timeout;
192 
193         spin_lock_bh(&subscriber->lock);
194         /* Destroy any existing subscriptions for subscriber */
195         list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list,
196                                  subscrp_list) {
197                 timeout = htohl(sub->evt.s.timeout, sub->swap);
198                 if ((timeout == TIPC_WAIT_FOREVER) || del_timer(&sub->timer)) {
199                         tipc_subscrp_delete(sub);
200                         tipc_subscrb_put(subscriber);
201                 }
202         }
203         spin_unlock_bh(&subscriber->lock);
204 
205         tipc_subscrb_put(subscriber);
206 }
207 
208 static void tipc_subscrp_delete(struct tipc_subscription *sub)
209 {
210         struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
211 
212         tipc_nametbl_unsubscribe(sub);
213         list_del(&sub->subscrp_list);
214         kfree(sub);
215         atomic_dec(&tn->subscription_count);
216 }
217 
218 static void tipc_subscrp_cancel(struct tipc_subscr *s,
219                                 struct tipc_subscriber *subscriber)
220 {
221         struct tipc_subscription *sub, *temp;
222         u32 timeout;
223 
224         spin_lock_bh(&subscriber->lock);
225         /* Find first matching subscription, exit if not found */
226         list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list,
227                                  subscrp_list) {
228                 if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
229                         timeout = htohl(sub->evt.s.timeout, sub->swap);
230                         if ((timeout == TIPC_WAIT_FOREVER) ||
231                             del_timer(&sub->timer)) {
232                                 tipc_subscrp_delete(sub);
233                                 tipc_subscrb_put(subscriber);
234                         }
235                         break;
236                 }
237         }
238         spin_unlock_bh(&subscriber->lock);
239 }
240 
241 static struct tipc_subscription *tipc_subscrp_create(struct net *net,
242                                                      struct tipc_subscr *s,
243                                                      int swap)
244 {
245         struct tipc_net *tn = net_generic(net, tipc_net_id);
246         struct tipc_subscription *sub;
247         u32 filter = htohl(s->filter, swap);
248 
249         /* Refuse subscription if global limit exceeded */
250         if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) {
251                 pr_warn("Subscription rejected, limit reached (%u)\n",
252                         TIPC_MAX_SUBSCRIPTIONS);
253                 return NULL;
254         }
255 
256         /* Allocate subscription object */
257         sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
258         if (!sub) {
259                 pr_warn("Subscription rejected, no memory\n");
260                 return NULL;
261         }
262 
263         /* Initialize subscription object */
264         sub->net = net;
265         if (((filter & TIPC_SUB_PORTS) && (filter & TIPC_SUB_SERVICE)) ||
266             (htohl(s->seq.lower, swap) > htohl(s->seq.upper, swap))) {
267                 pr_warn("Subscription rejected, illegal request\n");
268                 kfree(sub);
269                 return NULL;
270         }
271 
272         sub->swap = swap;
273         memcpy(&sub->evt.s, s, sizeof(*s));
274         atomic_inc(&tn->subscription_count);
275         return sub;
276 }
277 
278 static void tipc_subscrp_subscribe(struct net *net, struct tipc_subscr *s,
279                                    struct tipc_subscriber *subscriber, int swap)
280 {
281         struct tipc_net *tn = net_generic(net, tipc_net_id);
282         struct tipc_subscription *sub = NULL;
283         u32 timeout;
284 
285         sub = tipc_subscrp_create(net, s, swap);
286         if (!sub)
287                 return tipc_conn_terminate(tn->topsrv, subscriber->conid);
288 
289         spin_lock_bh(&subscriber->lock);
290         list_add(&sub->subscrp_list, &subscriber->subscrp_list);
291         tipc_subscrb_get(subscriber);
292         sub->subscriber = subscriber;
293         tipc_nametbl_subscribe(sub);
294         spin_unlock_bh(&subscriber->lock);
295 
296         timeout = htohl(sub->evt.s.timeout, swap);
297         if (timeout == TIPC_WAIT_FOREVER)
298                 return;
299 
300         setup_timer(&sub->timer, tipc_subscrp_timeout, (unsigned long)sub);
301         mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout));
302 }
303 
304 /* Handle one termination request for the subscriber */
305 static void tipc_subscrb_release_cb(int conid, void *usr_data)
306 {
307         tipc_subscrb_delete((struct tipc_subscriber *)usr_data);
308 }
309 
310 /* Handle one request to create a new subscription for the subscriber */
311 static void tipc_subscrb_rcv_cb(struct net *net, int conid,
312                                 struct sockaddr_tipc *addr, void *usr_data,
313                                 void *buf, size_t len)
314 {
315         struct tipc_subscriber *subscriber = usr_data;
316         struct tipc_subscr *s = (struct tipc_subscr *)buf;
317         int swap;
318 
319         /* Determine subscriber's endianness */
320         swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE |
321                               TIPC_SUB_CANCEL));
322 
323         /* Detect & process a subscription cancellation request */
324         if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
325                 s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
326                 return tipc_subscrp_cancel(s, subscriber);
327         }
328 
329         tipc_subscrp_subscribe(net, s, subscriber, swap);
330 }
331 
332 /* Handle one request to establish a new subscriber */
333 static void *tipc_subscrb_connect_cb(int conid)
334 {
335         return (void *)tipc_subscrb_create(conid);
336 }
337 
338 int tipc_topsrv_start(struct net *net)
339 {
340         struct tipc_net *tn = net_generic(net, tipc_net_id);
341         const char name[] = "topology_server";
342         struct tipc_server *topsrv;
343         struct sockaddr_tipc *saddr;
344 
345         saddr = kzalloc(sizeof(*saddr), GFP_ATOMIC);
346         if (!saddr)
347                 return -ENOMEM;
348         saddr->family                   = AF_TIPC;
349         saddr->addrtype                 = TIPC_ADDR_NAMESEQ;
350         saddr->addr.nameseq.type        = TIPC_TOP_SRV;
351         saddr->addr.nameseq.lower       = TIPC_TOP_SRV;
352         saddr->addr.nameseq.upper       = TIPC_TOP_SRV;
353         saddr->scope                    = TIPC_NODE_SCOPE;
354 
355         topsrv = kzalloc(sizeof(*topsrv), GFP_ATOMIC);
356         if (!topsrv) {
357                 kfree(saddr);
358                 return -ENOMEM;
359         }
360         topsrv->net                     = net;
361         topsrv->saddr                   = saddr;
362         topsrv->imp                     = TIPC_CRITICAL_IMPORTANCE;
363         topsrv->type                    = SOCK_SEQPACKET;
364         topsrv->max_rcvbuf_size         = sizeof(struct tipc_subscr);
365         topsrv->tipc_conn_recvmsg       = tipc_subscrb_rcv_cb;
366         topsrv->tipc_conn_new           = tipc_subscrb_connect_cb;
367         topsrv->tipc_conn_release       = tipc_subscrb_release_cb;
368 
369         strncpy(topsrv->name, name, strlen(name) + 1);
370         tn->topsrv = topsrv;
371         atomic_set(&tn->subscription_count, 0);
372 
373         return tipc_server_start(topsrv);
374 }
375 
376 void tipc_topsrv_stop(struct net *net)
377 {
378         struct tipc_net *tn = net_generic(net, tipc_net_id);
379         struct tipc_server *topsrv = tn->topsrv;
380 
381         tipc_server_stop(topsrv);
382         kfree(topsrv->saddr);
383         kfree(topsrv);
384 }
385 

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