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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 spinlock_t 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 return net_generic(net, phonet_net_id);
39}
40
41struct phonet_device_list *phonet_device_list(struct net *net)
42{
43 struct phonet_net *pnn = phonet_pernet(net);
44 return &pnn->pndevs;
45}
46
47/* Allocate new Phonet device. */
48static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
49{
50 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
51 struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
52 if (pnd == NULL)
53 return NULL;
54 pnd->netdev = dev;
55 bitmap_zero(pnd->addrs, 64);
56
57 lockdep_assert_held(&pndevs->lock);
58 list_add_rcu(&pnd->list, &pndevs->list);
59 return pnd;
60}
61
62static struct phonet_device *__phonet_get(struct net_device *dev)
63{
64 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
65 struct phonet_device *pnd;
66
67 lockdep_assert_held(&pndevs->lock);
68
69 list_for_each_entry(pnd, &pndevs->list, list) {
70 if (pnd->netdev == dev)
71 return pnd;
72 }
73 return NULL;
74}
75
76static struct phonet_device *__phonet_get_rcu(struct net_device *dev)
77{
78 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
79 struct phonet_device *pnd;
80
81 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
82 if (pnd->netdev == dev)
83 return pnd;
84 }
85 return NULL;
86}
87
88static void phonet_device_destroy(struct net_device *dev)
89{
90 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
91 struct phonet_device *pnd;
92
93 ASSERT_RTNL();
94
95 spin_lock(&pndevs->lock);
96
97 pnd = __phonet_get(dev);
98 if (pnd)
99 list_del_rcu(&pnd->list);
100
101 spin_unlock(&pndevs->lock);
102
103 if (pnd) {
104 struct net *net = dev_net(dev);
105 u32 ifindex = dev->ifindex;
106 u8 addr;
107
108 for_each_set_bit(addr, pnd->addrs, 64)
109 phonet_address_notify(net, RTM_DELADDR, ifindex, addr);
110
111 kfree(pnd);
112 }
113}
114
115struct net_device *phonet_device_get(struct net *net)
116{
117 struct phonet_device_list *pndevs = phonet_device_list(net);
118 struct phonet_device *pnd;
119 struct net_device *dev = NULL;
120
121 rcu_read_lock();
122 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
123 dev = pnd->netdev;
124 BUG_ON(!dev);
125
126 if ((dev->reg_state == NETREG_REGISTERED) &&
127 ((pnd->netdev->flags & IFF_UP)) == IFF_UP)
128 break;
129 dev = NULL;
130 }
131 dev_hold(dev);
132 rcu_read_unlock();
133 return dev;
134}
135
136int phonet_address_add(struct net_device *dev, u8 addr)
137{
138 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
139 struct phonet_device *pnd;
140 int err = 0;
141
142 spin_lock(&pndevs->lock);
143
144 /* Find or create Phonet-specific device data */
145 pnd = __phonet_get(dev);
146 if (pnd == NULL)
147 pnd = __phonet_device_alloc(dev);
148 if (unlikely(pnd == NULL))
149 err = -ENOMEM;
150 else if (test_and_set_bit(addr >> 2, pnd->addrs))
151 err = -EEXIST;
152
153 spin_unlock(&pndevs->lock);
154
155 return err;
156}
157
158int phonet_address_del(struct net_device *dev, u8 addr)
159{
160 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
161 struct phonet_device *pnd;
162 int err = 0;
163
164 spin_lock(&pndevs->lock);
165
166 pnd = __phonet_get(dev);
167 if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) {
168 err = -EADDRNOTAVAIL;
169 pnd = NULL;
170 } else if (bitmap_empty(pnd->addrs, 64))
171 list_del_rcu(&pnd->list);
172 else
173 pnd = NULL;
174
175 spin_unlock(&pndevs->lock);
176
177 if (pnd)
178 kfree_rcu(pnd, rcu);
179
180 return err;
181}
182
183/* Gets a source address toward a destination, through a interface. */
184u8 phonet_address_get(struct net_device *dev, u8 daddr)
185{
186 struct phonet_device *pnd;
187 u8 saddr;
188
189 rcu_read_lock();
190 pnd = __phonet_get_rcu(dev);
191 if (pnd) {
192 BUG_ON(bitmap_empty(pnd->addrs, 64));
193
194 /* Use same source address as destination, if possible */
195 if (test_bit(daddr >> 2, pnd->addrs))
196 saddr = daddr;
197 else
198 saddr = find_first_bit(pnd->addrs, 64) << 2;
199 } else
200 saddr = PN_NO_ADDR;
201 rcu_read_unlock();
202
203 if (saddr == PN_NO_ADDR) {
204 /* Fallback to another device */
205 struct net_device *def_dev;
206
207 def_dev = phonet_device_get(dev_net(dev));
208 if (def_dev) {
209 if (def_dev != dev)
210 saddr = phonet_address_get(def_dev, daddr);
211 dev_put(def_dev);
212 }
213 }
214 return saddr;
215}
216
217int phonet_address_lookup(struct net *net, u8 addr)
218{
219 struct phonet_device_list *pndevs = phonet_device_list(net);
220 struct phonet_device *pnd;
221 int err = -EADDRNOTAVAIL;
222
223 rcu_read_lock();
224 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
225 /* Don't allow unregistering devices! */
226 if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
227 ((pnd->netdev->flags & IFF_UP)) != IFF_UP)
228 continue;
229
230 if (test_bit(addr >> 2, pnd->addrs)) {
231 err = 0;
232 goto found;
233 }
234 }
235found:
236 rcu_read_unlock();
237 return err;
238}
239
240/* automatically configure a Phonet device, if supported */
241static int phonet_device_autoconf(struct net_device *dev)
242{
243 struct if_phonet_req req;
244 int ret;
245
246 if (!dev->netdev_ops->ndo_siocdevprivate)
247 return -EOPNOTSUPP;
248
249 ret = dev->netdev_ops->ndo_siocdevprivate(dev, (struct ifreq *)&req,
250 NULL, SIOCPNGAUTOCONF);
251 if (ret < 0)
252 return ret;
253
254 ASSERT_RTNL();
255 ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
256 if (ret)
257 return ret;
258
259 phonet_address_notify(dev_net(dev), RTM_NEWADDR, dev->ifindex,
260 req.ifr_phonet_autoconf.device);
261 return 0;
262}
263
264static void phonet_route_autodel(struct net_device *dev)
265{
266 struct net *net = dev_net(dev);
267 DECLARE_BITMAP(deleted, 64);
268 u32 ifindex = dev->ifindex;
269 struct phonet_net *pnn;
270 unsigned int i;
271
272 pnn = phonet_pernet(net);
273
274 /* Remove left-over Phonet routes */
275 bitmap_zero(deleted, 64);
276
277 spin_lock(&pnn->routes.lock);
278 for (i = 0; i < 64; i++) {
279 if (rcu_access_pointer(pnn->routes.table[i]) == dev) {
280 RCU_INIT_POINTER(pnn->routes.table[i], NULL);
281 set_bit(i, deleted);
282 }
283 }
284 spin_unlock(&pnn->routes.lock);
285
286 if (bitmap_empty(deleted, 64))
287 return; /* short-circuit RCU */
288 synchronize_rcu();
289 for_each_set_bit(i, deleted, 64) {
290 rtm_phonet_notify(net, RTM_DELROUTE, ifindex, i);
291 dev_put(dev);
292 }
293}
294
295/* notify Phonet of device events */
296static int phonet_device_notify(struct notifier_block *me, unsigned long what,
297 void *ptr)
298{
299 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
300
301 switch (what) {
302 case NETDEV_REGISTER:
303 if (dev->type == ARPHRD_PHONET)
304 phonet_device_autoconf(dev);
305 break;
306 case NETDEV_UNREGISTER:
307 phonet_device_destroy(dev);
308 phonet_route_autodel(dev);
309 break;
310 }
311 return 0;
312
313}
314
315static struct notifier_block phonet_device_notifier = {
316 .notifier_call = phonet_device_notify,
317 .priority = 0,
318};
319
320/* Per-namespace Phonet devices handling */
321static int __net_init phonet_init_net(struct net *net)
322{
323 struct phonet_net *pnn = phonet_pernet(net);
324
325 if (!proc_create_net("phonet", 0, net->proc_net, &pn_sock_seq_ops,
326 sizeof(struct seq_net_private)))
327 return -ENOMEM;
328
329 INIT_LIST_HEAD(&pnn->pndevs.list);
330 spin_lock_init(&pnn->pndevs.lock);
331 spin_lock_init(&pnn->routes.lock);
332 return 0;
333}
334
335static void __net_exit phonet_exit_net(struct net *net)
336{
337 struct phonet_net *pnn = phonet_pernet(net);
338
339 remove_proc_entry("phonet", net->proc_net);
340 WARN_ON_ONCE(!list_empty(&pnn->pndevs.list));
341}
342
343static struct pernet_operations phonet_net_ops = {
344 .init = phonet_init_net,
345 .exit = phonet_exit_net,
346 .id = &phonet_net_id,
347 .size = sizeof(struct phonet_net),
348};
349
350/* Initialize Phonet devices list */
351int __init phonet_device_init(void)
352{
353 int err = register_pernet_subsys(&phonet_net_ops);
354 if (err)
355 return err;
356
357 proc_create_net("pnresource", 0, init_net.proc_net, &pn_res_seq_ops,
358 sizeof(struct seq_net_private));
359 register_netdevice_notifier(&phonet_device_notifier);
360 err = phonet_netlink_register();
361 if (err)
362 phonet_device_exit();
363 return err;
364}
365
366void phonet_device_exit(void)
367{
368 rtnl_unregister_all(PF_PHONET);
369 unregister_netdevice_notifier(&phonet_device_notifier);
370 unregister_pernet_subsys(&phonet_net_ops);
371 remove_proc_entry("pnresource", init_net.proc_net);
372}
373
374int phonet_route_add(struct net_device *dev, u8 daddr)
375{
376 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
377 struct phonet_routes *routes = &pnn->routes;
378 int err = -EEXIST;
379
380 daddr = daddr >> 2;
381
382 spin_lock(&routes->lock);
383 if (routes->table[daddr] == NULL) {
384 rcu_assign_pointer(routes->table[daddr], dev);
385 dev_hold(dev);
386 err = 0;
387 }
388 spin_unlock(&routes->lock);
389
390 return err;
391}
392
393int phonet_route_del(struct net_device *dev, u8 daddr)
394{
395 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
396 struct phonet_routes *routes = &pnn->routes;
397
398 daddr = daddr >> 2;
399
400 spin_lock(&routes->lock);
401 if (rcu_access_pointer(routes->table[daddr]) == dev)
402 RCU_INIT_POINTER(routes->table[daddr], NULL);
403 else
404 dev = NULL;
405 spin_unlock(&routes->lock);
406
407 if (!dev)
408 return -ENOENT;
409
410 /* Note : our caller must call synchronize_rcu() and dev_put(dev) */
411
412 return 0;
413}
414
415struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr)
416{
417 struct phonet_net *pnn = phonet_pernet(net);
418 struct phonet_routes *routes = &pnn->routes;
419 struct net_device *dev;
420
421 daddr >>= 2;
422 dev = rcu_dereference(routes->table[daddr]);
423 return dev;
424}
425
426struct net_device *phonet_route_output(struct net *net, u8 daddr)
427{
428 struct phonet_net *pnn = phonet_pernet(net);
429 struct phonet_routes *routes = &pnn->routes;
430 struct net_device *dev;
431
432 daddr >>= 2;
433 rcu_read_lock();
434 dev = rcu_dereference(routes->table[daddr]);
435 dev_hold(dev);
436 rcu_read_unlock();
437
438 if (!dev)
439 dev = phonet_device_get(net); /* Default route */
440 return dev;
441}
1/*
2 * File: pn_dev.c
3 *
4 * Phonet network device
5 *
6 * Copyright (C) 2008 Nokia Corporation.
7 *
8 * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
9 * Original author: Sakari Ailus <sakari.ailus@nokia.com>
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 *table[64];
40};
41
42struct phonet_net {
43 struct phonet_device_list pndevs;
44 struct phonet_routes routes;
45};
46
47int 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 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 (dev == pnn->routes.table[i]) {
279 rcu_assign_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 *arg)
296{
297 struct net_device *dev = arg;
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_net_fops_create(net, "phonet", 0, &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 struct net_device *dev;
336 unsigned i;
337
338 rtnl_lock();
339 for_each_netdev(net, dev)
340 phonet_device_destroy(dev);
341
342 for (i = 0; i < 64; i++) {
343 dev = pnn->routes.table[i];
344 if (dev) {
345 rtm_phonet_notify(RTM_DELROUTE, dev, i);
346 dev_put(dev);
347 }
348 }
349 rtnl_unlock();
350
351 proc_net_remove(net, "phonet");
352}
353
354static struct pernet_operations phonet_net_ops = {
355 .init = phonet_init_net,
356 .exit = phonet_exit_net,
357 .id = &phonet_net_id,
358 .size = sizeof(struct phonet_net),
359};
360
361/* Initialize Phonet devices list */
362int __init phonet_device_init(void)
363{
364 int err = register_pernet_device(&phonet_net_ops);
365 if (err)
366 return err;
367
368 proc_net_fops_create(&init_net, "pnresource", 0, &pn_res_seq_fops);
369 register_netdevice_notifier(&phonet_device_notifier);
370 err = phonet_netlink_register();
371 if (err)
372 phonet_device_exit();
373 return err;
374}
375
376void phonet_device_exit(void)
377{
378 rtnl_unregister_all(PF_PHONET);
379 unregister_netdevice_notifier(&phonet_device_notifier);
380 unregister_pernet_device(&phonet_net_ops);
381 proc_net_remove(&init_net, "pnresource");
382}
383
384int phonet_route_add(struct net_device *dev, u8 daddr)
385{
386 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
387 struct phonet_routes *routes = &pnn->routes;
388 int err = -EEXIST;
389
390 daddr = daddr >> 2;
391 mutex_lock(&routes->lock);
392 if (routes->table[daddr] == NULL) {
393 rcu_assign_pointer(routes->table[daddr], dev);
394 dev_hold(dev);
395 err = 0;
396 }
397 mutex_unlock(&routes->lock);
398 return err;
399}
400
401int phonet_route_del(struct net_device *dev, u8 daddr)
402{
403 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
404 struct phonet_routes *routes = &pnn->routes;
405
406 daddr = daddr >> 2;
407 mutex_lock(&routes->lock);
408 if (dev == routes->table[daddr])
409 rcu_assign_pointer(routes->table[daddr], NULL);
410 else
411 dev = NULL;
412 mutex_unlock(&routes->lock);
413
414 if (!dev)
415 return -ENOENT;
416 synchronize_rcu();
417 dev_put(dev);
418 return 0;
419}
420
421struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr)
422{
423 struct phonet_net *pnn = phonet_pernet(net);
424 struct phonet_routes *routes = &pnn->routes;
425 struct net_device *dev;
426
427 daddr >>= 2;
428 dev = rcu_dereference(routes->table[daddr]);
429 return dev;
430}
431
432struct net_device *phonet_route_output(struct net *net, u8 daddr)
433{
434 struct phonet_net *pnn = phonet_pernet(net);
435 struct phonet_routes *routes = &pnn->routes;
436 struct net_device *dev;
437
438 daddr >>= 2;
439 rcu_read_lock();
440 dev = rcu_dereference(routes->table[daddr]);
441 if (dev)
442 dev_hold(dev);
443 rcu_read_unlock();
444
445 if (!dev)
446 dev = phonet_device_get(net); /* Default route */
447 return dev;
448}