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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * File: pn_dev.c
4 *
5 * Phonet network device
6 *
7 * Copyright (C) 2008 Nokia Corporation.
8 *
9 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
10 * Rémi Denis-Courmont
11 */
12
13#include <linux/kernel.h>
14#include <linux/net.h>
15#include <linux/slab.h>
16#include <linux/netdevice.h>
17#include <linux/phonet.h>
18#include <linux/proc_fs.h>
19#include <linux/if_arp.h>
20#include <net/sock.h>
21#include <net/netns/generic.h>
22#include <net/phonet/pn_dev.h>
23
24struct phonet_routes {
25 struct mutex lock;
26 struct net_device __rcu *table[64];
27};
28
29struct phonet_net {
30 struct phonet_device_list pndevs;
31 struct phonet_routes routes;
32};
33
34static unsigned int phonet_net_id __read_mostly;
35
36static struct phonet_net *phonet_pernet(struct net *net)
37{
38 BUG_ON(!net);
39
40 return net_generic(net, phonet_net_id);
41}
42
43struct phonet_device_list *phonet_device_list(struct net *net)
44{
45 struct phonet_net *pnn = phonet_pernet(net);
46 return &pnn->pndevs;
47}
48
49/* Allocate new Phonet device. */
50static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
51{
52 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
53 struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
54 if (pnd == NULL)
55 return NULL;
56 pnd->netdev = dev;
57 bitmap_zero(pnd->addrs, 64);
58
59 BUG_ON(!mutex_is_locked(&pndevs->lock));
60 list_add_rcu(&pnd->list, &pndevs->list);
61 return pnd;
62}
63
64static struct phonet_device *__phonet_get(struct net_device *dev)
65{
66 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
67 struct phonet_device *pnd;
68
69 BUG_ON(!mutex_is_locked(&pndevs->lock));
70 list_for_each_entry(pnd, &pndevs->list, list) {
71 if (pnd->netdev == dev)
72 return pnd;
73 }
74 return NULL;
75}
76
77static struct phonet_device *__phonet_get_rcu(struct net_device *dev)
78{
79 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
80 struct phonet_device *pnd;
81
82 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
83 if (pnd->netdev == dev)
84 return pnd;
85 }
86 return NULL;
87}
88
89static void phonet_device_destroy(struct net_device *dev)
90{
91 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
92 struct phonet_device *pnd;
93
94 ASSERT_RTNL();
95
96 mutex_lock(&pndevs->lock);
97 pnd = __phonet_get(dev);
98 if (pnd)
99 list_del_rcu(&pnd->list);
100 mutex_unlock(&pndevs->lock);
101
102 if (pnd) {
103 u8 addr;
104
105 for_each_set_bit(addr, pnd->addrs, 64)
106 phonet_address_notify(RTM_DELADDR, dev, addr);
107 kfree(pnd);
108 }
109}
110
111struct net_device *phonet_device_get(struct net *net)
112{
113 struct phonet_device_list *pndevs = phonet_device_list(net);
114 struct phonet_device *pnd;
115 struct net_device *dev = NULL;
116
117 rcu_read_lock();
118 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
119 dev = pnd->netdev;
120 BUG_ON(!dev);
121
122 if ((dev->reg_state == NETREG_REGISTERED) &&
123 ((pnd->netdev->flags & IFF_UP)) == IFF_UP)
124 break;
125 dev = NULL;
126 }
127 if (dev)
128 dev_hold(dev);
129 rcu_read_unlock();
130 return dev;
131}
132
133int phonet_address_add(struct net_device *dev, u8 addr)
134{
135 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
136 struct phonet_device *pnd;
137 int err = 0;
138
139 mutex_lock(&pndevs->lock);
140 /* Find or create Phonet-specific device data */
141 pnd = __phonet_get(dev);
142 if (pnd == NULL)
143 pnd = __phonet_device_alloc(dev);
144 if (unlikely(pnd == NULL))
145 err = -ENOMEM;
146 else if (test_and_set_bit(addr >> 2, pnd->addrs))
147 err = -EEXIST;
148 mutex_unlock(&pndevs->lock);
149 return err;
150}
151
152int phonet_address_del(struct net_device *dev, u8 addr)
153{
154 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
155 struct phonet_device *pnd;
156 int err = 0;
157
158 mutex_lock(&pndevs->lock);
159 pnd = __phonet_get(dev);
160 if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) {
161 err = -EADDRNOTAVAIL;
162 pnd = NULL;
163 } else if (bitmap_empty(pnd->addrs, 64))
164 list_del_rcu(&pnd->list);
165 else
166 pnd = NULL;
167 mutex_unlock(&pndevs->lock);
168
169 if (pnd)
170 kfree_rcu(pnd, rcu);
171
172 return err;
173}
174
175/* Gets a source address toward a destination, through a interface. */
176u8 phonet_address_get(struct net_device *dev, u8 daddr)
177{
178 struct phonet_device *pnd;
179 u8 saddr;
180
181 rcu_read_lock();
182 pnd = __phonet_get_rcu(dev);
183 if (pnd) {
184 BUG_ON(bitmap_empty(pnd->addrs, 64));
185
186 /* Use same source address as destination, if possible */
187 if (test_bit(daddr >> 2, pnd->addrs))
188 saddr = daddr;
189 else
190 saddr = find_first_bit(pnd->addrs, 64) << 2;
191 } else
192 saddr = PN_NO_ADDR;
193 rcu_read_unlock();
194
195 if (saddr == PN_NO_ADDR) {
196 /* Fallback to another device */
197 struct net_device *def_dev;
198
199 def_dev = phonet_device_get(dev_net(dev));
200 if (def_dev) {
201 if (def_dev != dev)
202 saddr = phonet_address_get(def_dev, daddr);
203 dev_put(def_dev);
204 }
205 }
206 return saddr;
207}
208
209int phonet_address_lookup(struct net *net, u8 addr)
210{
211 struct phonet_device_list *pndevs = phonet_device_list(net);
212 struct phonet_device *pnd;
213 int err = -EADDRNOTAVAIL;
214
215 rcu_read_lock();
216 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
217 /* Don't allow unregistering devices! */
218 if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
219 ((pnd->netdev->flags & IFF_UP)) != IFF_UP)
220 continue;
221
222 if (test_bit(addr >> 2, pnd->addrs)) {
223 err = 0;
224 goto found;
225 }
226 }
227found:
228 rcu_read_unlock();
229 return err;
230}
231
232/* automatically configure a Phonet device, if supported */
233static int phonet_device_autoconf(struct net_device *dev)
234{
235 struct if_phonet_req req;
236 int ret;
237
238 if (!dev->netdev_ops->ndo_do_ioctl)
239 return -EOPNOTSUPP;
240
241 ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
242 SIOCPNGAUTOCONF);
243 if (ret < 0)
244 return ret;
245
246 ASSERT_RTNL();
247 ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
248 if (ret)
249 return ret;
250 phonet_address_notify(RTM_NEWADDR, dev,
251 req.ifr_phonet_autoconf.device);
252 return 0;
253}
254
255static void phonet_route_autodel(struct net_device *dev)
256{
257 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
258 unsigned int i;
259 DECLARE_BITMAP(deleted, 64);
260
261 /* Remove left-over Phonet routes */
262 bitmap_zero(deleted, 64);
263 mutex_lock(&pnn->routes.lock);
264 for (i = 0; i < 64; i++)
265 if (rcu_access_pointer(pnn->routes.table[i]) == dev) {
266 RCU_INIT_POINTER(pnn->routes.table[i], NULL);
267 set_bit(i, deleted);
268 }
269 mutex_unlock(&pnn->routes.lock);
270
271 if (bitmap_empty(deleted, 64))
272 return; /* short-circuit RCU */
273 synchronize_rcu();
274 for_each_set_bit(i, deleted, 64) {
275 rtm_phonet_notify(RTM_DELROUTE, dev, i);
276 dev_put(dev);
277 }
278}
279
280/* notify Phonet of device events */
281static int phonet_device_notify(struct notifier_block *me, unsigned long what,
282 void *ptr)
283{
284 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
285
286 switch (what) {
287 case NETDEV_REGISTER:
288 if (dev->type == ARPHRD_PHONET)
289 phonet_device_autoconf(dev);
290 break;
291 case NETDEV_UNREGISTER:
292 phonet_device_destroy(dev);
293 phonet_route_autodel(dev);
294 break;
295 }
296 return 0;
297
298}
299
300static struct notifier_block phonet_device_notifier = {
301 .notifier_call = phonet_device_notify,
302 .priority = 0,
303};
304
305/* Per-namespace Phonet devices handling */
306static int __net_init phonet_init_net(struct net *net)
307{
308 struct phonet_net *pnn = phonet_pernet(net);
309
310 if (!proc_create_net("phonet", 0, net->proc_net, &pn_sock_seq_ops,
311 sizeof(struct seq_net_private)))
312 return -ENOMEM;
313
314 INIT_LIST_HEAD(&pnn->pndevs.list);
315 mutex_init(&pnn->pndevs.lock);
316 mutex_init(&pnn->routes.lock);
317 return 0;
318}
319
320static void __net_exit phonet_exit_net(struct net *net)
321{
322 struct phonet_net *pnn = phonet_pernet(net);
323
324 remove_proc_entry("phonet", net->proc_net);
325 WARN_ON_ONCE(!list_empty(&pnn->pndevs.list));
326}
327
328static struct pernet_operations phonet_net_ops = {
329 .init = phonet_init_net,
330 .exit = phonet_exit_net,
331 .id = &phonet_net_id,
332 .size = sizeof(struct phonet_net),
333};
334
335/* Initialize Phonet devices list */
336int __init phonet_device_init(void)
337{
338 int err = register_pernet_subsys(&phonet_net_ops);
339 if (err)
340 return err;
341
342 proc_create_net("pnresource", 0, init_net.proc_net, &pn_res_seq_ops,
343 sizeof(struct seq_net_private));
344 register_netdevice_notifier(&phonet_device_notifier);
345 err = phonet_netlink_register();
346 if (err)
347 phonet_device_exit();
348 return err;
349}
350
351void phonet_device_exit(void)
352{
353 rtnl_unregister_all(PF_PHONET);
354 unregister_netdevice_notifier(&phonet_device_notifier);
355 unregister_pernet_subsys(&phonet_net_ops);
356 remove_proc_entry("pnresource", init_net.proc_net);
357}
358
359int phonet_route_add(struct net_device *dev, u8 daddr)
360{
361 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
362 struct phonet_routes *routes = &pnn->routes;
363 int err = -EEXIST;
364
365 daddr = daddr >> 2;
366 mutex_lock(&routes->lock);
367 if (routes->table[daddr] == NULL) {
368 rcu_assign_pointer(routes->table[daddr], dev);
369 dev_hold(dev);
370 err = 0;
371 }
372 mutex_unlock(&routes->lock);
373 return err;
374}
375
376int phonet_route_del(struct net_device *dev, u8 daddr)
377{
378 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
379 struct phonet_routes *routes = &pnn->routes;
380
381 daddr = daddr >> 2;
382 mutex_lock(&routes->lock);
383 if (rcu_access_pointer(routes->table[daddr]) == dev)
384 RCU_INIT_POINTER(routes->table[daddr], NULL);
385 else
386 dev = NULL;
387 mutex_unlock(&routes->lock);
388
389 if (!dev)
390 return -ENOENT;
391 synchronize_rcu();
392 dev_put(dev);
393 return 0;
394}
395
396struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr)
397{
398 struct phonet_net *pnn = phonet_pernet(net);
399 struct phonet_routes *routes = &pnn->routes;
400 struct net_device *dev;
401
402 daddr >>= 2;
403 dev = rcu_dereference(routes->table[daddr]);
404 return dev;
405}
406
407struct net_device *phonet_route_output(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 rcu_read_lock();
415 dev = rcu_dereference(routes->table[daddr]);
416 if (dev)
417 dev_hold(dev);
418 rcu_read_unlock();
419
420 if (!dev)
421 dev = phonet_device_get(net); /* Default route */
422 return dev;
423}
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 * Rémi 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
37struct phonet_routes {
38 struct mutex lock;
39 struct net_device __rcu *table[64];
40};
41
42struct phonet_net {
43 struct phonet_device_list pndevs;
44 struct phonet_routes routes;
45};
46
47static unsigned int phonet_net_id __read_mostly;
48
49static struct phonet_net *phonet_pernet(struct net *net)
50{
51 BUG_ON(!net);
52
53 return net_generic(net, phonet_net_id);
54}
55
56struct 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. */
63static 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
77static 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
90static 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
102static 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
124struct 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
146int 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
165int 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. */
189u8 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
222int 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 }
240found:
241 rcu_read_unlock();
242 return err;
243}
244
245/* automatically configure a Phonet device, if supported */
246static 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
268static 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 */
294static 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
313static struct notifier_block phonet_device_notifier = {
314 .notifier_call = phonet_device_notify,
315 .priority = 0,
316};
317
318/* Per-namespace Phonet devices handling */
319static 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
332static 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
340static 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 */
348int __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
362void 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
370int 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
387int 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
407struct 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
418struct 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}