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Linux/net/phonet/pn_dev.c

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  1 /*
  2  * File: pn_dev.c
  3  *
  4  * Phonet network device
  5  *
  6  * Copyright (C) 2008 Nokia Corporation.
  7  *
  8  * Authors: Sakari Ailus <sakari.ailus@nokia.com>
  9  *          RĂ©mi Denis-Courmont
 10  *
 11  * This program is free software; you can redistribute it and/or
 12  * modify it under the terms of the GNU General Public License
 13  * version 2 as published by the Free Software Foundation.
 14  *
 15  * This program is distributed in the hope that it will be useful, but
 16  * WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 23  * 02110-1301 USA
 24  */
 25 
 26 #include <linux/kernel.h>
 27 #include <linux/net.h>
 28 #include <linux/slab.h>
 29 #include <linux/netdevice.h>
 30 #include <linux/phonet.h>
 31 #include <linux/proc_fs.h>
 32 #include <linux/if_arp.h>
 33 #include <net/sock.h>
 34 #include <net/netns/generic.h>
 35 #include <net/phonet/pn_dev.h>
 36 
 37 struct phonet_routes {
 38         struct mutex            lock;
 39         struct net_device __rcu *table[64];
 40 };
 41 
 42 struct phonet_net {
 43         struct phonet_device_list pndevs;
 44         struct phonet_routes routes;
 45 };
 46 
 47 static unsigned int phonet_net_id __read_mostly;
 48 
 49 static struct phonet_net *phonet_pernet(struct net *net)
 50 {
 51         BUG_ON(!net);
 52 
 53         return net_generic(net, phonet_net_id);
 54 }
 55 
 56 struct phonet_device_list *phonet_device_list(struct net *net)
 57 {
 58         struct phonet_net *pnn = phonet_pernet(net);
 59         return &pnn->pndevs;
 60 }
 61 
 62 /* Allocate new Phonet device. */
 63 static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
 64 {
 65         struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
 66         struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
 67         if (pnd == NULL)
 68                 return NULL;
 69         pnd->netdev = dev;
 70         bitmap_zero(pnd->addrs, 64);
 71 
 72         BUG_ON(!mutex_is_locked(&pndevs->lock));
 73         list_add_rcu(&pnd->list, &pndevs->list);
 74         return pnd;
 75 }
 76 
 77 static struct phonet_device *__phonet_get(struct net_device *dev)
 78 {
 79         struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
 80         struct phonet_device *pnd;
 81 
 82         BUG_ON(!mutex_is_locked(&pndevs->lock));
 83         list_for_each_entry(pnd, &pndevs->list, list) {
 84                 if (pnd->netdev == dev)
 85                         return pnd;
 86         }
 87         return NULL;
 88 }
 89 
 90 static struct phonet_device *__phonet_get_rcu(struct net_device *dev)
 91 {
 92         struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
 93         struct phonet_device *pnd;
 94 
 95         list_for_each_entry_rcu(pnd, &pndevs->list, list) {
 96                 if (pnd->netdev == dev)
 97                         return pnd;
 98         }
 99         return NULL;
100 }
101 
102 static void phonet_device_destroy(struct net_device *dev)
103 {
104         struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
105         struct phonet_device *pnd;
106 
107         ASSERT_RTNL();
108 
109         mutex_lock(&pndevs->lock);
110         pnd = __phonet_get(dev);
111         if (pnd)
112                 list_del_rcu(&pnd->list);
113         mutex_unlock(&pndevs->lock);
114 
115         if (pnd) {
116                 u8 addr;
117 
118                 for_each_set_bit(addr, pnd->addrs, 64)
119                         phonet_address_notify(RTM_DELADDR, dev, addr);
120                 kfree(pnd);
121         }
122 }
123 
124 struct net_device *phonet_device_get(struct net *net)
125 {
126         struct phonet_device_list *pndevs = phonet_device_list(net);
127         struct phonet_device *pnd;
128         struct net_device *dev = NULL;
129 
130         rcu_read_lock();
131         list_for_each_entry_rcu(pnd, &pndevs->list, list) {
132                 dev = pnd->netdev;
133                 BUG_ON(!dev);
134 
135                 if ((dev->reg_state == NETREG_REGISTERED) &&
136                         ((pnd->netdev->flags & IFF_UP)) == IFF_UP)
137                         break;
138                 dev = NULL;
139         }
140         if (dev)
141                 dev_hold(dev);
142         rcu_read_unlock();
143         return dev;
144 }
145 
146 int phonet_address_add(struct net_device *dev, u8 addr)
147 {
148         struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
149         struct phonet_device *pnd;
150         int err = 0;
151 
152         mutex_lock(&pndevs->lock);
153         /* Find or create Phonet-specific device data */
154         pnd = __phonet_get(dev);
155         if (pnd == NULL)
156                 pnd = __phonet_device_alloc(dev);
157         if (unlikely(pnd == NULL))
158                 err = -ENOMEM;
159         else if (test_and_set_bit(addr >> 2, pnd->addrs))
160                 err = -EEXIST;
161         mutex_unlock(&pndevs->lock);
162         return err;
163 }
164 
165 int phonet_address_del(struct net_device *dev, u8 addr)
166 {
167         struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
168         struct phonet_device *pnd;
169         int err = 0;
170 
171         mutex_lock(&pndevs->lock);
172         pnd = __phonet_get(dev);
173         if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) {
174                 err = -EADDRNOTAVAIL;
175                 pnd = NULL;
176         } else if (bitmap_empty(pnd->addrs, 64))
177                 list_del_rcu(&pnd->list);
178         else
179                 pnd = NULL;
180         mutex_unlock(&pndevs->lock);
181 
182         if (pnd)
183                 kfree_rcu(pnd, rcu);
184 
185         return err;
186 }
187 
188 /* Gets a source address toward a destination, through a interface. */
189 u8 phonet_address_get(struct net_device *dev, u8 daddr)
190 {
191         struct phonet_device *pnd;
192         u8 saddr;
193 
194         rcu_read_lock();
195         pnd = __phonet_get_rcu(dev);
196         if (pnd) {
197                 BUG_ON(bitmap_empty(pnd->addrs, 64));
198 
199                 /* Use same source address as destination, if possible */
200                 if (test_bit(daddr >> 2, pnd->addrs))
201                         saddr = daddr;
202                 else
203                         saddr = find_first_bit(pnd->addrs, 64) << 2;
204         } else
205                 saddr = PN_NO_ADDR;
206         rcu_read_unlock();
207 
208         if (saddr == PN_NO_ADDR) {
209                 /* Fallback to another device */
210                 struct net_device *def_dev;
211 
212                 def_dev = phonet_device_get(dev_net(dev));
213                 if (def_dev) {
214                         if (def_dev != dev)
215                                 saddr = phonet_address_get(def_dev, daddr);
216                         dev_put(def_dev);
217                 }
218         }
219         return saddr;
220 }
221 
222 int phonet_address_lookup(struct net *net, u8 addr)
223 {
224         struct phonet_device_list *pndevs = phonet_device_list(net);
225         struct phonet_device *pnd;
226         int err = -EADDRNOTAVAIL;
227 
228         rcu_read_lock();
229         list_for_each_entry_rcu(pnd, &pndevs->list, list) {
230                 /* Don't allow unregistering devices! */
231                 if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
232                                 ((pnd->netdev->flags & IFF_UP)) != IFF_UP)
233                         continue;
234 
235                 if (test_bit(addr >> 2, pnd->addrs)) {
236                         err = 0;
237                         goto found;
238                 }
239         }
240 found:
241         rcu_read_unlock();
242         return err;
243 }
244 
245 /* automatically configure a Phonet device, if supported */
246 static int phonet_device_autoconf(struct net_device *dev)
247 {
248         struct if_phonet_req req;
249         int ret;
250 
251         if (!dev->netdev_ops->ndo_do_ioctl)
252                 return -EOPNOTSUPP;
253 
254         ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
255                                                 SIOCPNGAUTOCONF);
256         if (ret < 0)
257                 return ret;
258 
259         ASSERT_RTNL();
260         ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
261         if (ret)
262                 return ret;
263         phonet_address_notify(RTM_NEWADDR, dev,
264                                 req.ifr_phonet_autoconf.device);
265         return 0;
266 }
267 
268 static void phonet_route_autodel(struct net_device *dev)
269 {
270         struct phonet_net *pnn = phonet_pernet(dev_net(dev));
271         unsigned int i;
272         DECLARE_BITMAP(deleted, 64);
273 
274         /* Remove left-over Phonet routes */
275         bitmap_zero(deleted, 64);
276         mutex_lock(&pnn->routes.lock);
277         for (i = 0; i < 64; i++)
278                 if (rcu_access_pointer(pnn->routes.table[i]) == dev) {
279                         RCU_INIT_POINTER(pnn->routes.table[i], NULL);
280                         set_bit(i, deleted);
281                 }
282         mutex_unlock(&pnn->routes.lock);
283 
284         if (bitmap_empty(deleted, 64))
285                 return; /* short-circuit RCU */
286         synchronize_rcu();
287         for_each_set_bit(i, deleted, 64) {
288                 rtm_phonet_notify(RTM_DELROUTE, dev, i);
289                 dev_put(dev);
290         }
291 }
292 
293 /* notify Phonet of device events */
294 static int phonet_device_notify(struct notifier_block *me, unsigned long what,
295                                 void *ptr)
296 {
297         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
298 
299         switch (what) {
300         case NETDEV_REGISTER:
301                 if (dev->type == ARPHRD_PHONET)
302                         phonet_device_autoconf(dev);
303                 break;
304         case NETDEV_UNREGISTER:
305                 phonet_device_destroy(dev);
306                 phonet_route_autodel(dev);
307                 break;
308         }
309         return 0;
310 
311 }
312 
313 static struct notifier_block phonet_device_notifier = {
314         .notifier_call = phonet_device_notify,
315         .priority = 0,
316 };
317 
318 /* Per-namespace Phonet devices handling */
319 static int __net_init phonet_init_net(struct net *net)
320 {
321         struct phonet_net *pnn = phonet_pernet(net);
322 
323         if (!proc_create("phonet", 0, net->proc_net, &pn_sock_seq_fops))
324                 return -ENOMEM;
325 
326         INIT_LIST_HEAD(&pnn->pndevs.list);
327         mutex_init(&pnn->pndevs.lock);
328         mutex_init(&pnn->routes.lock);
329         return 0;
330 }
331 
332 static void __net_exit phonet_exit_net(struct net *net)
333 {
334         struct phonet_net *pnn = phonet_pernet(net);
335 
336         remove_proc_entry("phonet", net->proc_net);
337         WARN_ON_ONCE(!list_empty(&pnn->pndevs.list));
338 }
339 
340 static struct pernet_operations phonet_net_ops = {
341         .init = phonet_init_net,
342         .exit = phonet_exit_net,
343         .id   = &phonet_net_id,
344         .size = sizeof(struct phonet_net),
345 };
346 
347 /* Initialize Phonet devices list */
348 int __init phonet_device_init(void)
349 {
350         int err = register_pernet_subsys(&phonet_net_ops);
351         if (err)
352                 return err;
353 
354         proc_create("pnresource", 0, init_net.proc_net, &pn_res_seq_fops);
355         register_netdevice_notifier(&phonet_device_notifier);
356         err = phonet_netlink_register();
357         if (err)
358                 phonet_device_exit();
359         return err;
360 }
361 
362 void phonet_device_exit(void)
363 {
364         rtnl_unregister_all(PF_PHONET);
365         unregister_netdevice_notifier(&phonet_device_notifier);
366         unregister_pernet_subsys(&phonet_net_ops);
367         remove_proc_entry("pnresource", init_net.proc_net);
368 }
369 
370 int phonet_route_add(struct net_device *dev, u8 daddr)
371 {
372         struct phonet_net *pnn = phonet_pernet(dev_net(dev));
373         struct phonet_routes *routes = &pnn->routes;
374         int err = -EEXIST;
375 
376         daddr = daddr >> 2;
377         mutex_lock(&routes->lock);
378         if (routes->table[daddr] == NULL) {
379                 rcu_assign_pointer(routes->table[daddr], dev);
380                 dev_hold(dev);
381                 err = 0;
382         }
383         mutex_unlock(&routes->lock);
384         return err;
385 }
386 
387 int phonet_route_del(struct net_device *dev, u8 daddr)
388 {
389         struct phonet_net *pnn = phonet_pernet(dev_net(dev));
390         struct phonet_routes *routes = &pnn->routes;
391 
392         daddr = daddr >> 2;
393         mutex_lock(&routes->lock);
394         if (rcu_access_pointer(routes->table[daddr]) == dev)
395                 RCU_INIT_POINTER(routes->table[daddr], NULL);
396         else
397                 dev = NULL;
398         mutex_unlock(&routes->lock);
399 
400         if (!dev)
401                 return -ENOENT;
402         synchronize_rcu();
403         dev_put(dev);
404         return 0;
405 }
406 
407 struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr)
408 {
409         struct phonet_net *pnn = phonet_pernet(net);
410         struct phonet_routes *routes = &pnn->routes;
411         struct net_device *dev;
412 
413         daddr >>= 2;
414         dev = rcu_dereference(routes->table[daddr]);
415         return dev;
416 }
417 
418 struct net_device *phonet_route_output(struct net *net, u8 daddr)
419 {
420         struct phonet_net *pnn = phonet_pernet(net);
421         struct phonet_routes *routes = &pnn->routes;
422         struct net_device *dev;
423 
424         daddr >>= 2;
425         rcu_read_lock();
426         dev = rcu_dereference(routes->table[daddr]);
427         if (dev)
428                 dev_hold(dev);
429         rcu_read_unlock();
430 
431         if (!dev)
432                 dev = phonet_device_get(net); /* Default route */
433         return dev;
434 }
435 

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