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>
37 struct phonet_device_list pndevs;
42 struct phonet_device_list *phonet_device_list(struct net *net)
44 struct phonet_net *pnn = net_generic(net, phonet_net_id);
48 /* Allocate new Phonet device. */
49 static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
51 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
52 struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
56 bitmap_zero(pnd->addrs, 64);
58 list_add(&pnd->list, &pndevs->list);
62 static struct phonet_device *__phonet_get(struct net_device *dev)
64 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
65 struct phonet_device *pnd;
67 list_for_each_entry(pnd, &pndevs->list, list) {
68 if (pnd->netdev == dev)
74 static void phonet_device_destroy(struct net_device *dev)
76 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
77 struct phonet_device *pnd;
81 spin_lock_bh(&pndevs->lock);
82 pnd = __phonet_get(dev);
85 spin_unlock_bh(&pndevs->lock);
90 for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
91 addr = find_next_bit(pnd->addrs, 64, 1+addr))
92 phonet_address_notify(RTM_DELADDR, dev, addr);
97 struct net_device *phonet_device_get(struct net *net)
99 struct phonet_device_list *pndevs = phonet_device_list(net);
100 struct phonet_device *pnd;
101 struct net_device *dev = NULL;
103 spin_lock_bh(&pndevs->lock);
104 list_for_each_entry(pnd, &pndevs->list, list) {
108 if ((dev->reg_state == NETREG_REGISTERED) &&
109 ((pnd->netdev->flags & IFF_UP)) == IFF_UP)
115 spin_unlock_bh(&pndevs->lock);
119 int phonet_address_add(struct net_device *dev, u8 addr)
121 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
122 struct phonet_device *pnd;
125 spin_lock_bh(&pndevs->lock);
126 /* Find or create Phonet-specific device data */
127 pnd = __phonet_get(dev);
129 pnd = __phonet_device_alloc(dev);
130 if (unlikely(pnd == NULL))
132 else if (test_and_set_bit(addr >> 2, pnd->addrs))
134 spin_unlock_bh(&pndevs->lock);
138 int phonet_address_del(struct net_device *dev, u8 addr)
140 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
141 struct phonet_device *pnd;
144 spin_lock_bh(&pndevs->lock);
145 pnd = __phonet_get(dev);
146 if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
147 err = -EADDRNOTAVAIL;
148 else if (bitmap_empty(pnd->addrs, 64)) {
149 list_del(&pnd->list);
152 spin_unlock_bh(&pndevs->lock);
156 /* Gets a source address toward a destination, through a interface. */
157 u8 phonet_address_get(struct net_device *dev, u8 addr)
159 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
160 struct phonet_device *pnd;
162 spin_lock_bh(&pndevs->lock);
163 pnd = __phonet_get(dev);
165 BUG_ON(bitmap_empty(pnd->addrs, 64));
167 /* Use same source address as destination, if possible */
168 if (!test_bit(addr >> 2, pnd->addrs))
169 addr = find_first_bit(pnd->addrs, 64) << 2;
172 spin_unlock_bh(&pndevs->lock);
176 int phonet_address_lookup(struct net *net, u8 addr)
178 struct phonet_device_list *pndevs = phonet_device_list(net);
179 struct phonet_device *pnd;
180 int err = -EADDRNOTAVAIL;
182 spin_lock_bh(&pndevs->lock);
183 list_for_each_entry(pnd, &pndevs->list, list) {
184 /* Don't allow unregistering devices! */
185 if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
186 ((pnd->netdev->flags & IFF_UP)) != IFF_UP)
189 if (test_bit(addr >> 2, pnd->addrs)) {
195 spin_unlock_bh(&pndevs->lock);
199 /* automatically configure a Phonet device, if supported */
200 static int phonet_device_autoconf(struct net_device *dev)
202 struct if_phonet_req req;
205 if (!dev->netdev_ops->ndo_do_ioctl)
208 ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
214 ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
217 phonet_address_notify(RTM_NEWADDR, dev,
218 req.ifr_phonet_autoconf.device);
222 /* notify Phonet of device events */
223 static int phonet_device_notify(struct notifier_block *me, unsigned long what,
226 struct net_device *dev = arg;
229 case NETDEV_REGISTER:
230 if (dev->type == ARPHRD_PHONET)
231 phonet_device_autoconf(dev);
233 case NETDEV_UNREGISTER:
234 phonet_device_destroy(dev);
241 static struct notifier_block phonet_device_notifier = {
242 .notifier_call = phonet_device_notify,
246 /* Per-namespace Phonet devices handling */
247 static int phonet_init_net(struct net *net)
249 struct phonet_net *pnn;
251 if (!net_eq(net, &init_net))
253 pnn = kmalloc(sizeof(*pnn), GFP_KERNEL);
257 if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) {
262 INIT_LIST_HEAD(&pnn->pndevs.list);
263 spin_lock_init(&pnn->pndevs.lock);
264 net_assign_generic(net, phonet_net_id, pnn);
268 static void phonet_exit_net(struct net *net)
270 struct phonet_net *pnn;
271 struct net_device *dev;
273 if (!net_eq(net, &init_net))
275 pnn = net_generic(net, phonet_net_id);
278 for_each_netdev(net, dev)
279 phonet_device_destroy(dev);
282 proc_net_remove(net, "phonet");
286 static struct pernet_operations phonet_net_ops = {
287 .init = phonet_init_net,
288 .exit = phonet_exit_net,
291 /* Initialize Phonet devices list */
292 int __init phonet_device_init(void)
294 int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
298 register_netdevice_notifier(&phonet_device_notifier);
299 err = phonet_netlink_register();
301 phonet_device_exit();
305 void phonet_device_exit(void)
307 rtnl_unregister_all(PF_PHONET);
308 unregister_netdevice_notifier(&phonet_device_notifier);
309 unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);