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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
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
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
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
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
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
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
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
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;
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
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
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
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);
422 return dev;
423}
424
