4 * Phonet network device
6 * Copyright (C) 2008 Nokia Corporation.
8 * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
9 * Original author: Sakari Ailus <sakari.ailus@nokia.com>
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.
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.
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
26 #include <linux/kernel.h>
27 #include <linux/net.h>
28 #include <linux/netdevice.h>
29 #include <linux/phonet.h>
30 #include <linux/proc_fs.h>
31 #include <linux/if_arp.h>
33 #include <net/netns/generic.h>
34 #include <net/phonet/pn_dev.h>
36 struct phonet_routes
{
38 struct net_device
*table
[64];
42 struct phonet_device_list pndevs
;
43 struct phonet_routes routes
;
46 int phonet_net_id __read_mostly
;
48 struct phonet_device_list
*phonet_device_list(struct net
*net
)
50 struct phonet_net
*pnn
= net_generic(net
, phonet_net_id
);
54 /* Allocate new Phonet device. */
55 static struct phonet_device
*__phonet_device_alloc(struct net_device
*dev
)
57 struct phonet_device_list
*pndevs
= phonet_device_list(dev_net(dev
));
58 struct phonet_device
*pnd
= kmalloc(sizeof(*pnd
), GFP_ATOMIC
);
62 bitmap_zero(pnd
->addrs
, 64);
64 list_add(&pnd
->list
, &pndevs
->list
);
68 static struct phonet_device
*__phonet_get(struct net_device
*dev
)
70 struct phonet_device_list
*pndevs
= phonet_device_list(dev_net(dev
));
71 struct phonet_device
*pnd
;
73 list_for_each_entry(pnd
, &pndevs
->list
, list
) {
74 if (pnd
->netdev
== dev
)
80 static void phonet_device_destroy(struct net_device
*dev
)
82 struct phonet_device_list
*pndevs
= phonet_device_list(dev_net(dev
));
83 struct phonet_device
*pnd
;
87 spin_lock_bh(&pndevs
->lock
);
88 pnd
= __phonet_get(dev
);
91 spin_unlock_bh(&pndevs
->lock
);
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
);
103 struct net_device
*phonet_device_get(struct net
*net
)
105 struct phonet_device_list
*pndevs
= phonet_device_list(net
);
106 struct phonet_device
*pnd
;
107 struct net_device
*dev
= NULL
;
109 spin_lock_bh(&pndevs
->lock
);
110 list_for_each_entry(pnd
, &pndevs
->list
, list
) {
114 if ((dev
->reg_state
== NETREG_REGISTERED
) &&
115 ((pnd
->netdev
->flags
& IFF_UP
)) == IFF_UP
)
121 spin_unlock_bh(&pndevs
->lock
);
125 int phonet_address_add(struct net_device
*dev
, u8 addr
)
127 struct phonet_device_list
*pndevs
= phonet_device_list(dev_net(dev
));
128 struct phonet_device
*pnd
;
131 spin_lock_bh(&pndevs
->lock
);
132 /* Find or create Phonet-specific device data */
133 pnd
= __phonet_get(dev
);
135 pnd
= __phonet_device_alloc(dev
);
136 if (unlikely(pnd
== NULL
))
138 else if (test_and_set_bit(addr
>> 2, pnd
->addrs
))
140 spin_unlock_bh(&pndevs
->lock
);
144 int phonet_address_del(struct net_device
*dev
, u8 addr
)
146 struct phonet_device_list
*pndevs
= phonet_device_list(dev_net(dev
));
147 struct phonet_device
*pnd
;
150 spin_lock_bh(&pndevs
->lock
);
151 pnd
= __phonet_get(dev
);
152 if (!pnd
|| !test_and_clear_bit(addr
>> 2, pnd
->addrs
))
153 err
= -EADDRNOTAVAIL
;
154 else if (bitmap_empty(pnd
->addrs
, 64)) {
155 list_del(&pnd
->list
);
158 spin_unlock_bh(&pndevs
->lock
);
162 /* Gets a source address toward a destination, through a interface. */
163 u8
phonet_address_get(struct net_device
*dev
, u8 daddr
)
165 struct phonet_device_list
*pndevs
= phonet_device_list(dev_net(dev
));
166 struct phonet_device
*pnd
;
169 spin_lock_bh(&pndevs
->lock
);
170 pnd
= __phonet_get(dev
);
172 BUG_ON(bitmap_empty(pnd
->addrs
, 64));
174 /* Use same source address as destination, if possible */
175 if (test_bit(daddr
>> 2, pnd
->addrs
))
178 saddr
= find_first_bit(pnd
->addrs
, 64) << 2;
181 spin_unlock_bh(&pndevs
->lock
);
183 if (saddr
== PN_NO_ADDR
) {
184 /* Fallback to another device */
185 struct net_device
*def_dev
;
187 def_dev
= phonet_device_get(dev_net(dev
));
190 saddr
= phonet_address_get(def_dev
, daddr
);
197 int phonet_address_lookup(struct net
*net
, u8 addr
)
199 struct phonet_device_list
*pndevs
= phonet_device_list(net
);
200 struct phonet_device
*pnd
;
201 int err
= -EADDRNOTAVAIL
;
203 spin_lock_bh(&pndevs
->lock
);
204 list_for_each_entry(pnd
, &pndevs
->list
, list
) {
205 /* Don't allow unregistering devices! */
206 if ((pnd
->netdev
->reg_state
!= NETREG_REGISTERED
) ||
207 ((pnd
->netdev
->flags
& IFF_UP
)) != IFF_UP
)
210 if (test_bit(addr
>> 2, pnd
->addrs
)) {
216 spin_unlock_bh(&pndevs
->lock
);
220 /* automatically configure a Phonet device, if supported */
221 static int phonet_device_autoconf(struct net_device
*dev
)
223 struct if_phonet_req req
;
226 if (!dev
->netdev_ops
->ndo_do_ioctl
)
229 ret
= dev
->netdev_ops
->ndo_do_ioctl(dev
, (struct ifreq
*)&req
,
235 ret
= phonet_address_add(dev
, req
.ifr_phonet_autoconf
.device
);
238 phonet_address_notify(RTM_NEWADDR
, dev
,
239 req
.ifr_phonet_autoconf
.device
);
243 static void phonet_route_autodel(struct net_device
*dev
)
245 struct phonet_net
*pnn
= net_generic(dev_net(dev
), phonet_net_id
);
247 DECLARE_BITMAP(deleted
, 64);
249 /* Remove left-over Phonet routes */
250 bitmap_zero(deleted
, 64);
251 mutex_lock(&pnn
->routes
.lock
);
252 for (i
= 0; i
< 64; i
++)
253 if (dev
== pnn
->routes
.table
[i
]) {
254 rcu_assign_pointer(pnn
->routes
.table
[i
], NULL
);
257 mutex_unlock(&pnn
->routes
.lock
);
259 if (bitmap_empty(deleted
, 64))
260 return; /* short-circuit RCU */
262 for (i
= find_first_bit(deleted
, 64); i
< 64;
263 i
= find_next_bit(deleted
, 64, i
+ 1)) {
264 rtm_phonet_notify(RTM_DELROUTE
, dev
, i
);
269 /* notify Phonet of device events */
270 static int phonet_device_notify(struct notifier_block
*me
, unsigned long what
,
273 struct net_device
*dev
= arg
;
276 case NETDEV_REGISTER
:
277 if (dev
->type
== ARPHRD_PHONET
)
278 phonet_device_autoconf(dev
);
280 case NETDEV_UNREGISTER
:
281 phonet_device_destroy(dev
);
282 phonet_route_autodel(dev
);
289 static struct notifier_block phonet_device_notifier
= {
290 .notifier_call
= phonet_device_notify
,
294 /* Per-namespace Phonet devices handling */
295 static int phonet_init_net(struct net
*net
)
297 struct phonet_net
*pnn
= kzalloc(sizeof(*pnn
), GFP_KERNEL
);
301 if (!proc_net_fops_create(net
, "phonet", 0, &pn_sock_seq_fops
)) {
306 INIT_LIST_HEAD(&pnn
->pndevs
.list
);
307 spin_lock_init(&pnn
->pndevs
.lock
);
308 mutex_init(&pnn
->routes
.lock
);
309 net_assign_generic(net
, phonet_net_id
, pnn
);
313 static void phonet_exit_net(struct net
*net
)
315 struct phonet_net
*pnn
= net_generic(net
, phonet_net_id
);
316 struct net_device
*dev
;
320 for_each_netdev(net
, dev
)
321 phonet_device_destroy(dev
);
323 for (i
= 0; i
< 64; i
++) {
324 dev
= pnn
->routes
.table
[i
];
326 rtm_phonet_notify(RTM_DELROUTE
, dev
, i
);
332 proc_net_remove(net
, "phonet");
336 static struct pernet_operations phonet_net_ops
= {
337 .init
= phonet_init_net
,
338 .exit
= phonet_exit_net
,
341 /* Initialize Phonet devices list */
342 int __init
phonet_device_init(void)
344 int err
= register_pernet_gen_device(&phonet_net_id
, &phonet_net_ops
);
348 register_netdevice_notifier(&phonet_device_notifier
);
349 err
= phonet_netlink_register();
351 phonet_device_exit();
355 void phonet_device_exit(void)
357 rtnl_unregister_all(PF_PHONET
);
358 unregister_netdevice_notifier(&phonet_device_notifier
);
359 unregister_pernet_gen_device(phonet_net_id
, &phonet_net_ops
);
362 int phonet_route_add(struct net_device
*dev
, u8 daddr
)
364 struct phonet_net
*pnn
= net_generic(dev_net(dev
), phonet_net_id
);
365 struct phonet_routes
*routes
= &pnn
->routes
;
369 mutex_lock(&routes
->lock
);
370 if (routes
->table
[daddr
] == NULL
) {
371 rcu_assign_pointer(routes
->table
[daddr
], dev
);
375 mutex_unlock(&routes
->lock
);
379 int phonet_route_del(struct net_device
*dev
, u8 daddr
)
381 struct phonet_net
*pnn
= net_generic(dev_net(dev
), phonet_net_id
);
382 struct phonet_routes
*routes
= &pnn
->routes
;
385 mutex_lock(&routes
->lock
);
386 if (dev
== routes
->table
[daddr
])
387 rcu_assign_pointer(routes
->table
[daddr
], NULL
);
390 mutex_unlock(&routes
->lock
);
399 struct net_device
*phonet_route_get(struct net
*net
, u8 daddr
)
401 struct phonet_net
*pnn
= net_generic(net
, phonet_net_id
);
402 struct phonet_routes
*routes
= &pnn
->routes
;
403 struct net_device
*dev
;
405 ASSERT_RTNL(); /* no need to hold the device */
409 dev
= rcu_dereference(routes
->table
[daddr
]);
414 struct net_device
*phonet_route_output(struct net
*net
, u8 daddr
)
416 struct phonet_net
*pnn
= net_generic(net
, phonet_net_id
);
417 struct phonet_routes
*routes
= &pnn
->routes
;
418 struct net_device
*dev
;
422 dev
= rcu_dereference(routes
->table
[daddr
]);
428 dev
= phonet_device_get(net
); /* Default route */