Commit | Line | Data |
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2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f8ff6028 RDC |
2 | /* |
3 | * File: pn_dev.c | |
4 | * | |
5 | * Phonet network device | |
6 | * | |
7 | * Copyright (C) 2008 Nokia Corporation. | |
8 | * | |
31fdc555 RDC |
9 | * Authors: Sakari Ailus <sakari.ailus@nokia.com> |
10 | * Rémi Denis-Courmont | |
f8ff6028 RDC |
11 | */ |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/net.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
f8ff6028 RDC |
16 | #include <linux/netdevice.h> |
17 | #include <linux/phonet.h> | |
421d20a3 | 18 | #include <linux/proc_fs.h> |
f5bb1c55 | 19 | #include <linux/if_arp.h> |
f8ff6028 | 20 | #include <net/sock.h> |
9a3b7a42 | 21 | #include <net/netns/generic.h> |
f8ff6028 RDC |
22 | #include <net/phonet/pn_dev.h> |
23 | ||
55748ac0 | 24 | struct phonet_routes { |
88880135 | 25 | struct mutex lock; |
79952bca | 26 | struct net_device __rcu *table[64]; |
55748ac0 RDC |
27 | }; |
28 | ||
9a3b7a42 | 29 | struct phonet_net { |
30 | struct phonet_device_list pndevs; | |
55748ac0 | 31 | struct phonet_routes routes; |
f8ff6028 RDC |
32 | }; |
33 | ||
c7d03a00 | 34 | static unsigned int phonet_net_id __read_mostly; |
9a3b7a42 | 35 | |
0db3f0f4 JP |
36 | static struct phonet_net *phonet_pernet(struct net *net) |
37 | { | |
0db3f0f4 JP |
38 | return net_generic(net, phonet_net_id); |
39 | } | |
40 | ||
9a3b7a42 | 41 | struct phonet_device_list *phonet_device_list(struct net *net) |
42 | { | |
0db3f0f4 | 43 | struct phonet_net *pnn = phonet_pernet(net); |
9a3b7a42 | 44 | return &pnn->pndevs; |
45 | } | |
46 | ||
f8ff6028 RDC |
47 | /* Allocate new Phonet device. */ |
48 | static struct phonet_device *__phonet_device_alloc(struct net_device *dev) | |
49 | { | |
9a3b7a42 | 50 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
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 | ||
eeb74a9d RDC |
57 | BUG_ON(!mutex_is_locked(&pndevs->lock)); |
58 | list_add_rcu(&pnd->list, &pndevs->list); | |
f8ff6028 RDC |
59 | return pnd; |
60 | } | |
61 | ||
62 | static struct phonet_device *__phonet_get(struct net_device *dev) | |
63 | { | |
9a3b7a42 | 64 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
65 | struct phonet_device *pnd; |
66 | ||
eeb74a9d | 67 | BUG_ON(!mutex_is_locked(&pndevs->lock)); |
9a3b7a42 | 68 | list_for_each_entry(pnd, &pndevs->list, list) { |
f8ff6028 RDC |
69 | if (pnd->netdev == dev) |
70 | return pnd; | |
71 | } | |
72 | return NULL; | |
73 | } | |
74 | ||
eeb74a9d RDC |
75 | static 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 | ||
2be6fa4c | 87 | static void phonet_device_destroy(struct net_device *dev) |
f8ff6028 | 88 | { |
2be6fa4c RDC |
89 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
90 | struct phonet_device *pnd; | |
91 | ||
92 | ASSERT_RTNL(); | |
93 | ||
eeb74a9d | 94 | mutex_lock(&pndevs->lock); |
2be6fa4c RDC |
95 | pnd = __phonet_get(dev); |
96 | if (pnd) | |
eeb74a9d RDC |
97 | list_del_rcu(&pnd->list); |
98 | mutex_unlock(&pndevs->lock); | |
2be6fa4c RDC |
99 | |
100 | if (pnd) { | |
101 | u8 addr; | |
102 | ||
a1ca14ac | 103 | for_each_set_bit(addr, pnd->addrs, 64) |
2be6fa4c RDC |
104 | phonet_address_notify(RTM_DELADDR, dev, addr); |
105 | kfree(pnd); | |
106 | } | |
f8ff6028 RDC |
107 | } |
108 | ||
109 | struct net_device *phonet_device_get(struct net *net) | |
110 | { | |
9a3b7a42 | 111 | struct phonet_device_list *pndevs = phonet_device_list(net); |
f8ff6028 | 112 | struct phonet_device *pnd; |
59e57f44 | 113 | struct net_device *dev = NULL; |
f8ff6028 | 114 | |
eeb74a9d RDC |
115 | rcu_read_lock(); |
116 | list_for_each_entry_rcu(pnd, &pndevs->list, list) { | |
f8ff6028 RDC |
117 | dev = pnd->netdev; |
118 | BUG_ON(!dev); | |
119 | ||
9a3b7a42 | 120 | if ((dev->reg_state == NETREG_REGISTERED) && |
f8ff6028 RDC |
121 | ((pnd->netdev->flags & IFF_UP)) == IFF_UP) |
122 | break; | |
123 | dev = NULL; | |
124 | } | |
1160dfa1 | 125 | dev_hold(dev); |
eeb74a9d | 126 | rcu_read_unlock(); |
f8ff6028 RDC |
127 | return dev; |
128 | } | |
129 | ||
130 | int phonet_address_add(struct net_device *dev, u8 addr) | |
131 | { | |
9a3b7a42 | 132 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
133 | struct phonet_device *pnd; |
134 | int err = 0; | |
135 | ||
eeb74a9d | 136 | mutex_lock(&pndevs->lock); |
f8ff6028 RDC |
137 | /* Find or create Phonet-specific device data */ |
138 | pnd = __phonet_get(dev); | |
139 | if (pnd == NULL) | |
140 | pnd = __phonet_device_alloc(dev); | |
141 | if (unlikely(pnd == NULL)) | |
142 | err = -ENOMEM; | |
143 | else if (test_and_set_bit(addr >> 2, pnd->addrs)) | |
144 | err = -EEXIST; | |
eeb74a9d | 145 | mutex_unlock(&pndevs->lock); |
f8ff6028 RDC |
146 | return err; |
147 | } | |
148 | ||
149 | int phonet_address_del(struct net_device *dev, u8 addr) | |
150 | { | |
9a3b7a42 | 151 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
152 | struct phonet_device *pnd; |
153 | int err = 0; | |
154 | ||
eeb74a9d | 155 | mutex_lock(&pndevs->lock); |
f8ff6028 | 156 | pnd = __phonet_get(dev); |
eeb74a9d | 157 | if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) { |
f8ff6028 | 158 | err = -EADDRNOTAVAIL; |
eeb74a9d RDC |
159 | pnd = NULL; |
160 | } else if (bitmap_empty(pnd->addrs, 64)) | |
161 | list_del_rcu(&pnd->list); | |
162 | else | |
163 | pnd = NULL; | |
164 | mutex_unlock(&pndevs->lock); | |
165 | ||
88e7594a | 166 | if (pnd) |
7e113a9c | 167 | kfree_rcu(pnd, rcu); |
88e7594a | 168 | |
f8ff6028 RDC |
169 | return err; |
170 | } | |
171 | ||
172 | /* Gets a source address toward a destination, through a interface. */ | |
55748ac0 | 173 | u8 phonet_address_get(struct net_device *dev, u8 daddr) |
f8ff6028 RDC |
174 | { |
175 | struct phonet_device *pnd; | |
55748ac0 | 176 | u8 saddr; |
f8ff6028 | 177 | |
eeb74a9d RDC |
178 | rcu_read_lock(); |
179 | pnd = __phonet_get_rcu(dev); | |
f8ff6028 RDC |
180 | if (pnd) { |
181 | BUG_ON(bitmap_empty(pnd->addrs, 64)); | |
182 | ||
183 | /* Use same source address as destination, if possible */ | |
55748ac0 RDC |
184 | if (test_bit(daddr >> 2, pnd->addrs)) |
185 | saddr = daddr; | |
186 | else | |
187 | saddr = find_first_bit(pnd->addrs, 64) << 2; | |
f8ff6028 | 188 | } else |
55748ac0 | 189 | saddr = PN_NO_ADDR; |
eeb74a9d | 190 | rcu_read_unlock(); |
55748ac0 RDC |
191 | |
192 | if (saddr == PN_NO_ADDR) { | |
193 | /* Fallback to another device */ | |
194 | struct net_device *def_dev; | |
195 | ||
196 | def_dev = phonet_device_get(dev_net(dev)); | |
197 | if (def_dev) { | |
198 | if (def_dev != dev) | |
199 | saddr = phonet_address_get(def_dev, daddr); | |
200 | dev_put(def_dev); | |
201 | } | |
202 | } | |
203 | return saddr; | |
f8ff6028 RDC |
204 | } |
205 | ||
52404881 | 206 | int phonet_address_lookup(struct net *net, u8 addr) |
f8ff6028 | 207 | { |
9a3b7a42 | 208 | struct phonet_device_list *pndevs = phonet_device_list(net); |
f8ff6028 | 209 | struct phonet_device *pnd; |
9a3b7a42 | 210 | int err = -EADDRNOTAVAIL; |
f8ff6028 | 211 | |
eeb74a9d RDC |
212 | rcu_read_lock(); |
213 | list_for_each_entry_rcu(pnd, &pndevs->list, list) { | |
f8ff6028 RDC |
214 | /* Don't allow unregistering devices! */ |
215 | if ((pnd->netdev->reg_state != NETREG_REGISTERED) || | |
216 | ((pnd->netdev->flags & IFF_UP)) != IFF_UP) | |
217 | continue; | |
218 | ||
219 | if (test_bit(addr >> 2, pnd->addrs)) { | |
9a3b7a42 | 220 | err = 0; |
221 | goto found; | |
f8ff6028 RDC |
222 | } |
223 | } | |
9a3b7a42 | 224 | found: |
eeb74a9d | 225 | rcu_read_unlock(); |
9a3b7a42 | 226 | return err; |
f8ff6028 RDC |
227 | } |
228 | ||
f5bb1c55 RDC |
229 | /* automatically configure a Phonet device, if supported */ |
230 | static int phonet_device_autoconf(struct net_device *dev) | |
231 | { | |
232 | struct if_phonet_req req; | |
233 | int ret; | |
234 | ||
4747c1a8 | 235 | if (!dev->netdev_ops->ndo_siocdevprivate) |
f5bb1c55 RDC |
236 | return -EOPNOTSUPP; |
237 | ||
4747c1a8 AB |
238 | ret = dev->netdev_ops->ndo_siocdevprivate(dev, (struct ifreq *)&req, |
239 | NULL, SIOCPNGAUTOCONF); | |
f5bb1c55 RDC |
240 | if (ret < 0) |
241 | return ret; | |
b11b5165 RDC |
242 | |
243 | ASSERT_RTNL(); | |
244 | ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device); | |
245 | if (ret) | |
246 | return ret; | |
247 | phonet_address_notify(RTM_NEWADDR, dev, | |
248 | req.ifr_phonet_autoconf.device); | |
249 | return 0; | |
f5bb1c55 RDC |
250 | } |
251 | ||
f062f41d RDC |
252 | static void phonet_route_autodel(struct net_device *dev) |
253 | { | |
0db3f0f4 | 254 | struct phonet_net *pnn = phonet_pernet(dev_net(dev)); |
95c96174 | 255 | unsigned int i; |
f062f41d RDC |
256 | DECLARE_BITMAP(deleted, 64); |
257 | ||
258 | /* Remove left-over Phonet routes */ | |
259 | bitmap_zero(deleted, 64); | |
88880135 | 260 | mutex_lock(&pnn->routes.lock); |
f062f41d | 261 | for (i = 0; i < 64; i++) |
79952bca | 262 | if (rcu_access_pointer(pnn->routes.table[i]) == dev) { |
a9b3cd7f | 263 | RCU_INIT_POINTER(pnn->routes.table[i], NULL); |
f062f41d | 264 | set_bit(i, deleted); |
f062f41d | 265 | } |
88880135 RDC |
266 | mutex_unlock(&pnn->routes.lock); |
267 | ||
268 | if (bitmap_empty(deleted, 64)) | |
269 | return; /* short-circuit RCU */ | |
270 | synchronize_rcu(); | |
6a499b24 | 271 | for_each_set_bit(i, deleted, 64) { |
f062f41d | 272 | rtm_phonet_notify(RTM_DELROUTE, dev, i); |
88880135 RDC |
273 | dev_put(dev); |
274 | } | |
f062f41d RDC |
275 | } |
276 | ||
f8ff6028 RDC |
277 | /* notify Phonet of device events */ |
278 | static int phonet_device_notify(struct notifier_block *me, unsigned long what, | |
351638e7 | 279 | void *ptr) |
f8ff6028 | 280 | { |
351638e7 | 281 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
f8ff6028 | 282 | |
f5bb1c55 RDC |
283 | switch (what) { |
284 | case NETDEV_REGISTER: | |
285 | if (dev->type == ARPHRD_PHONET) | |
286 | phonet_device_autoconf(dev); | |
287 | break; | |
288 | case NETDEV_UNREGISTER: | |
2be6fa4c | 289 | phonet_device_destroy(dev); |
f062f41d | 290 | phonet_route_autodel(dev); |
f5bb1c55 RDC |
291 | break; |
292 | } | |
f8ff6028 RDC |
293 | return 0; |
294 | ||
295 | } | |
296 | ||
297 | static struct notifier_block phonet_device_notifier = { | |
298 | .notifier_call = phonet_device_notify, | |
299 | .priority = 0, | |
300 | }; | |
301 | ||
9a3b7a42 | 302 | /* Per-namespace Phonet devices handling */ |
2c8c1e72 | 303 | static int __net_init phonet_init_net(struct net *net) |
9a3b7a42 | 304 | { |
0db3f0f4 | 305 | struct phonet_net *pnn = phonet_pernet(net); |
9a3b7a42 | 306 | |
c3506372 CH |
307 | if (!proc_create_net("phonet", 0, net->proc_net, &pn_sock_seq_ops, |
308 | sizeof(struct seq_net_private))) | |
c1dc13e9 | 309 | return -ENOMEM; |
c1dc13e9 | 310 | |
9a3b7a42 | 311 | INIT_LIST_HEAD(&pnn->pndevs.list); |
eeb74a9d | 312 | mutex_init(&pnn->pndevs.lock); |
88880135 | 313 | mutex_init(&pnn->routes.lock); |
9a3b7a42 | 314 | return 0; |
315 | } | |
316 | ||
2c8c1e72 | 317 | static void __net_exit phonet_exit_net(struct net *net) |
9a3b7a42 | 318 | { |
ae61e8cd VA |
319 | struct phonet_net *pnn = phonet_pernet(net); |
320 | ||
ece31ffd | 321 | remove_proc_entry("phonet", net->proc_net); |
ae61e8cd | 322 | WARN_ON_ONCE(!list_empty(&pnn->pndevs.list)); |
9a3b7a42 | 323 | } |
324 | ||
325 | static struct pernet_operations phonet_net_ops = { | |
326 | .init = phonet_init_net, | |
327 | .exit = phonet_exit_net, | |
d2b3eb63 EB |
328 | .id = &phonet_net_id, |
329 | .size = sizeof(struct phonet_net), | |
9a3b7a42 | 330 | }; |
331 | ||
f8ff6028 | 332 | /* Initialize Phonet devices list */ |
76e02cf6 | 333 | int __init phonet_device_init(void) |
f8ff6028 | 334 | { |
03478756 | 335 | int err = register_pernet_subsys(&phonet_net_ops); |
9a3b7a42 | 336 | if (err) |
337 | return err; | |
660f706d | 338 | |
c3506372 CH |
339 | proc_create_net("pnresource", 0, init_net.proc_net, &pn_res_seq_ops, |
340 | sizeof(struct seq_net_private)); | |
f8ff6028 | 341 | register_netdevice_notifier(&phonet_device_notifier); |
660f706d | 342 | err = phonet_netlink_register(); |
343 | if (err) | |
344 | phonet_device_exit(); | |
345 | return err; | |
f8ff6028 RDC |
346 | } |
347 | ||
348 | void phonet_device_exit(void) | |
349 | { | |
f8ff6028 | 350 | rtnl_unregister_all(PF_PHONET); |
6530e0fe | 351 | unregister_netdevice_notifier(&phonet_device_notifier); |
03478756 | 352 | unregister_pernet_subsys(&phonet_net_ops); |
ece31ffd | 353 | remove_proc_entry("pnresource", init_net.proc_net); |
f8ff6028 | 354 | } |
55748ac0 RDC |
355 | |
356 | int phonet_route_add(struct net_device *dev, u8 daddr) | |
357 | { | |
0db3f0f4 | 358 | struct phonet_net *pnn = phonet_pernet(dev_net(dev)); |
55748ac0 RDC |
359 | struct phonet_routes *routes = &pnn->routes; |
360 | int err = -EEXIST; | |
361 | ||
362 | daddr = daddr >> 2; | |
88880135 | 363 | mutex_lock(&routes->lock); |
55748ac0 | 364 | if (routes->table[daddr] == NULL) { |
cf778b00 | 365 | rcu_assign_pointer(routes->table[daddr], dev); |
55748ac0 RDC |
366 | dev_hold(dev); |
367 | err = 0; | |
368 | } | |
88880135 | 369 | mutex_unlock(&routes->lock); |
55748ac0 RDC |
370 | return err; |
371 | } | |
372 | ||
373 | int phonet_route_del(struct net_device *dev, u8 daddr) | |
374 | { | |
0db3f0f4 | 375 | struct phonet_net *pnn = phonet_pernet(dev_net(dev)); |
55748ac0 | 376 | struct phonet_routes *routes = &pnn->routes; |
55748ac0 RDC |
377 | |
378 | daddr = daddr >> 2; | |
88880135 | 379 | mutex_lock(&routes->lock); |
79952bca | 380 | if (rcu_access_pointer(routes->table[daddr]) == dev) |
a9b3cd7f | 381 | RCU_INIT_POINTER(routes->table[daddr], NULL); |
88880135 RDC |
382 | else |
383 | dev = NULL; | |
384 | mutex_unlock(&routes->lock); | |
385 | ||
386 | if (!dev) | |
387 | return -ENOENT; | |
388 | synchronize_rcu(); | |
389 | dev_put(dev); | |
390 | return 0; | |
55748ac0 RDC |
391 | } |
392 | ||
e67f88dd | 393 | struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr) |
55748ac0 | 394 | { |
0db3f0f4 | 395 | struct phonet_net *pnn = phonet_pernet(net); |
55748ac0 RDC |
396 | struct phonet_routes *routes = &pnn->routes; |
397 | struct net_device *dev; | |
398 | ||
55748ac0 | 399 | daddr >>= 2; |
88880135 | 400 | dev = rcu_dereference(routes->table[daddr]); |
55748ac0 RDC |
401 | return dev; |
402 | } | |
403 | ||
404 | struct net_device *phonet_route_output(struct net *net, u8 daddr) | |
405 | { | |
0db3f0f4 | 406 | struct phonet_net *pnn = phonet_pernet(net); |
55748ac0 RDC |
407 | struct phonet_routes *routes = &pnn->routes; |
408 | struct net_device *dev; | |
409 | ||
88880135 RDC |
410 | daddr >>= 2; |
411 | rcu_read_lock(); | |
412 | dev = rcu_dereference(routes->table[daddr]); | |
1160dfa1 | 413 | dev_hold(dev); |
88880135 | 414 | rcu_read_unlock(); |
55748ac0 RDC |
415 | |
416 | if (!dev) | |
417 | dev = phonet_device_get(net); /* Default route */ | |
418 | return dev; | |
419 | } |