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>
31 #include <net/netns/generic.h>
32 #include <net/phonet/pn_dev.h>
35 struct phonet_device_list pndevs;
40 struct phonet_device_list *phonet_device_list(struct net *net)
42 struct phonet_net *pnn = net_generic(net, phonet_net_id);
46 /* Allocate new Phonet device. */
47 static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
49 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
50 struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
54 bitmap_zero(pnd->addrs, 64);
56 list_add(&pnd->list, &pndevs->list);
60 static struct phonet_device *__phonet_get(struct net_device *dev)
62 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
63 struct phonet_device *pnd;
65 list_for_each_entry(pnd, &pndevs->list, list) {
66 if (pnd->netdev == dev)
72 static void phonet_device_destroy(struct net_device *dev)
74 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
75 struct phonet_device *pnd;
79 spin_lock_bh(&pndevs->lock);
80 pnd = __phonet_get(dev);
83 spin_unlock_bh(&pndevs->lock);
88 for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
89 addr = find_next_bit(pnd->addrs, 64, 1+addr))
90 phonet_address_notify(RTM_DELADDR, dev, addr);
95 struct net_device *phonet_device_get(struct net *net)
97 struct phonet_device_list *pndevs = phonet_device_list(net);
98 struct phonet_device *pnd;
99 struct net_device *dev;
101 spin_lock_bh(&pndevs->lock);
102 list_for_each_entry(pnd, &pndevs->list, list) {
106 if ((dev->reg_state == NETREG_REGISTERED) &&
107 ((pnd->netdev->flags & IFF_UP)) == IFF_UP)
113 spin_unlock_bh(&pndevs->lock);
117 int phonet_address_add(struct net_device *dev, u8 addr)
119 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
120 struct phonet_device *pnd;
123 spin_lock_bh(&pndevs->lock);
124 /* Find or create Phonet-specific device data */
125 pnd = __phonet_get(dev);
127 pnd = __phonet_device_alloc(dev);
128 if (unlikely(pnd == NULL))
130 else if (test_and_set_bit(addr >> 2, pnd->addrs))
132 spin_unlock_bh(&pndevs->lock);
136 int phonet_address_del(struct net_device *dev, u8 addr)
138 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
139 struct phonet_device *pnd;
142 spin_lock_bh(&pndevs->lock);
143 pnd = __phonet_get(dev);
144 if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
145 err = -EADDRNOTAVAIL;
146 else if (bitmap_empty(pnd->addrs, 64)) {
147 list_del(&pnd->list);
150 spin_unlock_bh(&pndevs->lock);
154 /* Gets a source address toward a destination, through a interface. */
155 u8 phonet_address_get(struct net_device *dev, u8 addr)
157 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
158 struct phonet_device *pnd;
160 spin_lock_bh(&pndevs->lock);
161 pnd = __phonet_get(dev);
163 BUG_ON(bitmap_empty(pnd->addrs, 64));
165 /* Use same source address as destination, if possible */
166 if (!test_bit(addr >> 2, pnd->addrs))
167 addr = find_first_bit(pnd->addrs, 64) << 2;
170 spin_unlock_bh(&pndevs->lock);
174 int phonet_address_lookup(struct net *net, u8 addr)
176 struct phonet_device_list *pndevs = phonet_device_list(net);
177 struct phonet_device *pnd;
178 int err = -EADDRNOTAVAIL;
180 spin_lock_bh(&pndevs->lock);
181 list_for_each_entry(pnd, &pndevs->list, list) {
182 /* Don't allow unregistering devices! */
183 if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
184 ((pnd->netdev->flags & IFF_UP)) != IFF_UP)
187 if (test_bit(addr >> 2, pnd->addrs)) {
193 spin_unlock_bh(&pndevs->lock);
197 /* notify Phonet of device events */
198 static int phonet_device_notify(struct notifier_block *me, unsigned long what,
201 struct net_device *dev = arg;
203 if (what == NETDEV_UNREGISTER)
204 phonet_device_destroy(dev);
209 static struct notifier_block phonet_device_notifier = {
210 .notifier_call = phonet_device_notify,
214 /* Per-namespace Phonet devices handling */
215 static int phonet_init_net(struct net *net)
217 struct phonet_net *pnn = kmalloc(sizeof(*pnn), GFP_KERNEL);
221 INIT_LIST_HEAD(&pnn->pndevs.list);
222 spin_lock_init(&pnn->pndevs.lock);
223 net_assign_generic(net, phonet_net_id, pnn);
227 static void phonet_exit_net(struct net *net)
229 struct phonet_net *pnn = net_generic(net, phonet_net_id);
230 struct net_device *dev;
233 for_each_netdev(net, dev)
234 phonet_device_destroy(dev);
239 static struct pernet_operations phonet_net_ops = {
240 .init = phonet_init_net,
241 .exit = phonet_exit_net,
244 /* Initialize Phonet devices list */
245 int __init phonet_device_init(void)
247 int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
251 register_netdevice_notifier(&phonet_device_notifier);
252 err = phonet_netlink_register();
254 phonet_device_exit();
258 void phonet_device_exit(void)
260 rtnl_unregister_all(PF_PHONET);
261 unregister_netdevice_notifier(&phonet_device_notifier);
262 unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);