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