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f8ff6028 RDC |
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/netdevice.h> | |
29 | #include <linux/phonet.h> | |
421d20a3 | 30 | #include <linux/proc_fs.h> |
f5bb1c55 | 31 | #include <linux/if_arp.h> |
f8ff6028 | 32 | #include <net/sock.h> |
9a3b7a42 | 33 | #include <net/netns/generic.h> |
f8ff6028 RDC |
34 | #include <net/phonet/pn_dev.h> |
35 | ||
55748ac0 RDC |
36 | struct phonet_routes { |
37 | spinlock_t lock; | |
38 | struct net_device *table[64]; | |
39 | }; | |
40 | ||
9a3b7a42 | 41 | struct phonet_net { |
42 | struct phonet_device_list pndevs; | |
55748ac0 | 43 | struct phonet_routes routes; |
f8ff6028 RDC |
44 | }; |
45 | ||
9a3b7a42 | 46 | int phonet_net_id; |
47 | ||
48 | struct phonet_device_list *phonet_device_list(struct net *net) | |
49 | { | |
50 | struct phonet_net *pnn = net_generic(net, phonet_net_id); | |
51 | return &pnn->pndevs; | |
52 | } | |
53 | ||
f8ff6028 RDC |
54 | /* Allocate new Phonet device. */ |
55 | static struct phonet_device *__phonet_device_alloc(struct net_device *dev) | |
56 | { | |
9a3b7a42 | 57 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
58 | struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC); |
59 | if (pnd == NULL) | |
60 | return NULL; | |
61 | pnd->netdev = dev; | |
62 | bitmap_zero(pnd->addrs, 64); | |
63 | ||
9a3b7a42 | 64 | list_add(&pnd->list, &pndevs->list); |
f8ff6028 RDC |
65 | return pnd; |
66 | } | |
67 | ||
68 | static struct phonet_device *__phonet_get(struct net_device *dev) | |
69 | { | |
9a3b7a42 | 70 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
71 | struct phonet_device *pnd; |
72 | ||
9a3b7a42 | 73 | list_for_each_entry(pnd, &pndevs->list, list) { |
f8ff6028 RDC |
74 | if (pnd->netdev == dev) |
75 | return pnd; | |
76 | } | |
77 | return NULL; | |
78 | } | |
79 | ||
2be6fa4c | 80 | static void phonet_device_destroy(struct net_device *dev) |
f8ff6028 | 81 | { |
2be6fa4c RDC |
82 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
83 | struct phonet_device *pnd; | |
84 | ||
85 | ASSERT_RTNL(); | |
86 | ||
87 | spin_lock_bh(&pndevs->lock); | |
88 | pnd = __phonet_get(dev); | |
89 | if (pnd) | |
90 | list_del(&pnd->list); | |
91 | spin_unlock_bh(&pndevs->lock); | |
92 | ||
93 | if (pnd) { | |
94 | u8 addr; | |
95 | ||
96 | for (addr = find_first_bit(pnd->addrs, 64); addr < 64; | |
97 | addr = find_next_bit(pnd->addrs, 64, 1+addr)) | |
98 | phonet_address_notify(RTM_DELADDR, dev, addr); | |
99 | kfree(pnd); | |
100 | } | |
f8ff6028 RDC |
101 | } |
102 | ||
103 | struct net_device *phonet_device_get(struct net *net) | |
104 | { | |
9a3b7a42 | 105 | struct phonet_device_list *pndevs = phonet_device_list(net); |
f8ff6028 | 106 | struct phonet_device *pnd; |
59e57f44 | 107 | struct net_device *dev = NULL; |
f8ff6028 | 108 | |
9a3b7a42 | 109 | spin_lock_bh(&pndevs->lock); |
110 | list_for_each_entry(pnd, &pndevs->list, list) { | |
f8ff6028 RDC |
111 | dev = pnd->netdev; |
112 | BUG_ON(!dev); | |
113 | ||
9a3b7a42 | 114 | if ((dev->reg_state == NETREG_REGISTERED) && |
f8ff6028 RDC |
115 | ((pnd->netdev->flags & IFF_UP)) == IFF_UP) |
116 | break; | |
117 | dev = NULL; | |
118 | } | |
119 | if (dev) | |
120 | dev_hold(dev); | |
9a3b7a42 | 121 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
122 | return dev; |
123 | } | |
124 | ||
125 | int phonet_address_add(struct net_device *dev, u8 addr) | |
126 | { | |
9a3b7a42 | 127 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
128 | struct phonet_device *pnd; |
129 | int err = 0; | |
130 | ||
9a3b7a42 | 131 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
132 | /* Find or create Phonet-specific device data */ |
133 | pnd = __phonet_get(dev); | |
134 | if (pnd == NULL) | |
135 | pnd = __phonet_device_alloc(dev); | |
136 | if (unlikely(pnd == NULL)) | |
137 | err = -ENOMEM; | |
138 | else if (test_and_set_bit(addr >> 2, pnd->addrs)) | |
139 | err = -EEXIST; | |
9a3b7a42 | 140 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
141 | return err; |
142 | } | |
143 | ||
144 | int phonet_address_del(struct net_device *dev, u8 addr) | |
145 | { | |
9a3b7a42 | 146 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
147 | struct phonet_device *pnd; |
148 | int err = 0; | |
149 | ||
9a3b7a42 | 150 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
151 | pnd = __phonet_get(dev); |
152 | if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) | |
153 | err = -EADDRNOTAVAIL; | |
2be6fa4c RDC |
154 | else if (bitmap_empty(pnd->addrs, 64)) { |
155 | list_del(&pnd->list); | |
156 | kfree(pnd); | |
157 | } | |
9a3b7a42 | 158 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
159 | return err; |
160 | } | |
161 | ||
162 | /* Gets a source address toward a destination, through a interface. */ | |
55748ac0 | 163 | u8 phonet_address_get(struct net_device *dev, u8 daddr) |
f8ff6028 | 164 | { |
9a3b7a42 | 165 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 | 166 | struct phonet_device *pnd; |
55748ac0 | 167 | u8 saddr; |
f8ff6028 | 168 | |
9a3b7a42 | 169 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
170 | pnd = __phonet_get(dev); |
171 | if (pnd) { | |
172 | BUG_ON(bitmap_empty(pnd->addrs, 64)); | |
173 | ||
174 | /* Use same source address as destination, if possible */ | |
55748ac0 RDC |
175 | if (test_bit(daddr >> 2, pnd->addrs)) |
176 | saddr = daddr; | |
177 | else | |
178 | saddr = find_first_bit(pnd->addrs, 64) << 2; | |
f8ff6028 | 179 | } else |
55748ac0 | 180 | saddr = PN_NO_ADDR; |
9a3b7a42 | 181 | spin_unlock_bh(&pndevs->lock); |
55748ac0 RDC |
182 | |
183 | if (saddr == PN_NO_ADDR) { | |
184 | /* Fallback to another device */ | |
185 | struct net_device *def_dev; | |
186 | ||
187 | def_dev = phonet_device_get(dev_net(dev)); | |
188 | if (def_dev) { | |
189 | if (def_dev != dev) | |
190 | saddr = phonet_address_get(def_dev, daddr); | |
191 | dev_put(def_dev); | |
192 | } | |
193 | } | |
194 | return saddr; | |
f8ff6028 RDC |
195 | } |
196 | ||
52404881 | 197 | int phonet_address_lookup(struct net *net, u8 addr) |
f8ff6028 | 198 | { |
9a3b7a42 | 199 | struct phonet_device_list *pndevs = phonet_device_list(net); |
f8ff6028 | 200 | struct phonet_device *pnd; |
9a3b7a42 | 201 | int err = -EADDRNOTAVAIL; |
f8ff6028 | 202 | |
9a3b7a42 | 203 | spin_lock_bh(&pndevs->lock); |
204 | list_for_each_entry(pnd, &pndevs->list, list) { | |
f8ff6028 RDC |
205 | /* Don't allow unregistering devices! */ |
206 | if ((pnd->netdev->reg_state != NETREG_REGISTERED) || | |
207 | ((pnd->netdev->flags & IFF_UP)) != IFF_UP) | |
208 | continue; | |
209 | ||
210 | if (test_bit(addr >> 2, pnd->addrs)) { | |
9a3b7a42 | 211 | err = 0; |
212 | goto found; | |
f8ff6028 RDC |
213 | } |
214 | } | |
9a3b7a42 | 215 | found: |
216 | spin_unlock_bh(&pndevs->lock); | |
217 | return err; | |
f8ff6028 RDC |
218 | } |
219 | ||
f5bb1c55 RDC |
220 | /* automatically configure a Phonet device, if supported */ |
221 | static int phonet_device_autoconf(struct net_device *dev) | |
222 | { | |
223 | struct if_phonet_req req; | |
224 | int ret; | |
225 | ||
226 | if (!dev->netdev_ops->ndo_do_ioctl) | |
227 | return -EOPNOTSUPP; | |
228 | ||
229 | ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req, | |
230 | SIOCPNGAUTOCONF); | |
231 | if (ret < 0) | |
232 | return ret; | |
b11b5165 RDC |
233 | |
234 | ASSERT_RTNL(); | |
235 | ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device); | |
236 | if (ret) | |
237 | return ret; | |
238 | phonet_address_notify(RTM_NEWADDR, dev, | |
239 | req.ifr_phonet_autoconf.device); | |
240 | return 0; | |
f5bb1c55 RDC |
241 | } |
242 | ||
f8ff6028 RDC |
243 | /* notify Phonet of device events */ |
244 | static int phonet_device_notify(struct notifier_block *me, unsigned long what, | |
245 | void *arg) | |
246 | { | |
247 | struct net_device *dev = arg; | |
248 | ||
f5bb1c55 RDC |
249 | switch (what) { |
250 | case NETDEV_REGISTER: | |
251 | if (dev->type == ARPHRD_PHONET) | |
252 | phonet_device_autoconf(dev); | |
253 | break; | |
254 | case NETDEV_UNREGISTER: | |
2be6fa4c | 255 | phonet_device_destroy(dev); |
f5bb1c55 RDC |
256 | break; |
257 | } | |
f8ff6028 RDC |
258 | return 0; |
259 | ||
260 | } | |
261 | ||
262 | static struct notifier_block phonet_device_notifier = { | |
263 | .notifier_call = phonet_device_notify, | |
264 | .priority = 0, | |
265 | }; | |
266 | ||
9a3b7a42 | 267 | /* Per-namespace Phonet devices handling */ |
268 | static int phonet_init_net(struct net *net) | |
269 | { | |
55748ac0 | 270 | struct phonet_net *pnn = kzalloc(sizeof(*pnn), GFP_KERNEL); |
9a3b7a42 | 271 | if (!pnn) |
272 | return -ENOMEM; | |
273 | ||
c1dc13e9 RDC |
274 | if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) { |
275 | kfree(pnn); | |
276 | return -ENOMEM; | |
277 | } | |
278 | ||
9a3b7a42 | 279 | INIT_LIST_HEAD(&pnn->pndevs.list); |
280 | spin_lock_init(&pnn->pndevs.lock); | |
55748ac0 | 281 | spin_lock_init(&pnn->routes.lock); |
9a3b7a42 | 282 | net_assign_generic(net, phonet_net_id, pnn); |
283 | return 0; | |
284 | } | |
285 | ||
286 | static void phonet_exit_net(struct net *net) | |
287 | { | |
288 | struct phonet_net *pnn = net_generic(net, phonet_net_id); | |
2be6fa4c | 289 | struct net_device *dev; |
9a3b7a42 | 290 | |
2be6fa4c RDC |
291 | rtnl_lock(); |
292 | for_each_netdev(net, dev) | |
293 | phonet_device_destroy(dev); | |
294 | rtnl_unlock(); | |
c1dc13e9 RDC |
295 | |
296 | proc_net_remove(net, "phonet"); | |
9a3b7a42 | 297 | kfree(pnn); |
298 | } | |
299 | ||
300 | static struct pernet_operations phonet_net_ops = { | |
301 | .init = phonet_init_net, | |
302 | .exit = phonet_exit_net, | |
303 | }; | |
304 | ||
f8ff6028 | 305 | /* Initialize Phonet devices list */ |
76e02cf6 | 306 | int __init phonet_device_init(void) |
f8ff6028 | 307 | { |
9a3b7a42 | 308 | int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops); |
309 | if (err) | |
310 | return err; | |
660f706d | 311 | |
f8ff6028 | 312 | register_netdevice_notifier(&phonet_device_notifier); |
660f706d | 313 | err = phonet_netlink_register(); |
314 | if (err) | |
315 | phonet_device_exit(); | |
316 | return err; | |
f8ff6028 RDC |
317 | } |
318 | ||
319 | void phonet_device_exit(void) | |
320 | { | |
f8ff6028 | 321 | rtnl_unregister_all(PF_PHONET); |
6530e0fe | 322 | unregister_netdevice_notifier(&phonet_device_notifier); |
9a3b7a42 | 323 | unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops); |
f8ff6028 | 324 | } |
55748ac0 RDC |
325 | |
326 | int phonet_route_add(struct net_device *dev, u8 daddr) | |
327 | { | |
328 | struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id); | |
329 | struct phonet_routes *routes = &pnn->routes; | |
330 | int err = -EEXIST; | |
331 | ||
332 | daddr = daddr >> 2; | |
333 | spin_lock_bh(&routes->lock); | |
334 | if (routes->table[daddr] == NULL) { | |
335 | routes->table[daddr] = dev; | |
336 | dev_hold(dev); | |
337 | err = 0; | |
338 | } | |
339 | spin_unlock_bh(&routes->lock); | |
340 | return err; | |
341 | } | |
342 | ||
343 | int phonet_route_del(struct net_device *dev, u8 daddr) | |
344 | { | |
345 | struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id); | |
346 | struct phonet_routes *routes = &pnn->routes; | |
347 | int err = -ENOENT; | |
348 | ||
349 | daddr = daddr >> 2; | |
350 | spin_lock_bh(&routes->lock); | |
351 | if (dev == routes->table[daddr]) { | |
352 | routes->table[daddr] = NULL; | |
353 | dev_put(dev); | |
354 | err = 0; | |
355 | } | |
356 | spin_unlock_bh(&routes->lock); | |
357 | return err; | |
358 | } | |
359 | ||
360 | struct net_device *phonet_route_get(struct net *net, u8 daddr) | |
361 | { | |
362 | struct phonet_net *pnn = net_generic(net, phonet_net_id); | |
363 | struct phonet_routes *routes = &pnn->routes; | |
364 | struct net_device *dev; | |
365 | ||
366 | ASSERT_RTNL(); /* no need to hold the device */ | |
367 | ||
368 | daddr >>= 2; | |
369 | spin_lock_bh(&routes->lock); | |
370 | dev = routes->table[daddr]; | |
371 | spin_unlock_bh(&routes->lock); | |
372 | return dev; | |
373 | } | |
374 | ||
375 | struct net_device *phonet_route_output(struct net *net, u8 daddr) | |
376 | { | |
377 | struct phonet_net *pnn = net_generic(net, phonet_net_id); | |
378 | struct phonet_routes *routes = &pnn->routes; | |
379 | struct net_device *dev; | |
380 | ||
381 | spin_lock_bh(&routes->lock); | |
382 | dev = routes->table[daddr >> 2]; | |
383 | if (dev) | |
384 | dev_hold(dev); | |
385 | spin_unlock_bh(&routes->lock); | |
386 | ||
387 | if (!dev) | |
388 | dev = phonet_device_get(net); /* Default route */ | |
389 | return dev; | |
390 | } |