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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 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}