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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> |
f8ff6028 | 31 | #include <net/sock.h> |
9a3b7a42 | 32 | #include <net/netns/generic.h> |
f8ff6028 RDC |
33 | #include <net/phonet/pn_dev.h> |
34 | ||
9a3b7a42 | 35 | struct phonet_net { |
36 | struct phonet_device_list pndevs; | |
f8ff6028 RDC |
37 | }; |
38 | ||
9a3b7a42 | 39 | int phonet_net_id; |
40 | ||
41 | struct phonet_device_list *phonet_device_list(struct net *net) | |
42 | { | |
43 | struct phonet_net *pnn = net_generic(net, phonet_net_id); | |
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 | ||
9a3b7a42 | 57 | list_add(&pnd->list, &pndevs->list); |
f8ff6028 RDC |
58 | return pnd; |
59 | } | |
60 | ||
61 | static struct phonet_device *__phonet_get(struct net_device *dev) | |
62 | { | |
9a3b7a42 | 63 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
64 | struct phonet_device *pnd; |
65 | ||
9a3b7a42 | 66 | list_for_each_entry(pnd, &pndevs->list, list) { |
f8ff6028 RDC |
67 | if (pnd->netdev == dev) |
68 | return pnd; | |
69 | } | |
70 | return NULL; | |
71 | } | |
72 | ||
2be6fa4c | 73 | static void phonet_device_destroy(struct net_device *dev) |
f8ff6028 | 74 | { |
2be6fa4c RDC |
75 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
76 | struct phonet_device *pnd; | |
77 | ||
78 | ASSERT_RTNL(); | |
79 | ||
80 | spin_lock_bh(&pndevs->lock); | |
81 | pnd = __phonet_get(dev); | |
82 | if (pnd) | |
83 | list_del(&pnd->list); | |
84 | spin_unlock_bh(&pndevs->lock); | |
85 | ||
86 | if (pnd) { | |
87 | u8 addr; | |
88 | ||
89 | for (addr = find_first_bit(pnd->addrs, 64); addr < 64; | |
90 | addr = find_next_bit(pnd->addrs, 64, 1+addr)) | |
91 | phonet_address_notify(RTM_DELADDR, dev, addr); | |
92 | kfree(pnd); | |
93 | } | |
f8ff6028 RDC |
94 | } |
95 | ||
96 | struct net_device *phonet_device_get(struct net *net) | |
97 | { | |
9a3b7a42 | 98 | struct phonet_device_list *pndevs = phonet_device_list(net); |
f8ff6028 RDC |
99 | struct phonet_device *pnd; |
100 | struct net_device *dev; | |
101 | ||
9a3b7a42 | 102 | spin_lock_bh(&pndevs->lock); |
103 | list_for_each_entry(pnd, &pndevs->list, list) { | |
f8ff6028 RDC |
104 | dev = pnd->netdev; |
105 | BUG_ON(!dev); | |
106 | ||
9a3b7a42 | 107 | if ((dev->reg_state == NETREG_REGISTERED) && |
f8ff6028 RDC |
108 | ((pnd->netdev->flags & IFF_UP)) == IFF_UP) |
109 | break; | |
110 | dev = NULL; | |
111 | } | |
112 | if (dev) | |
113 | dev_hold(dev); | |
9a3b7a42 | 114 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
115 | return dev; |
116 | } | |
117 | ||
118 | int phonet_address_add(struct net_device *dev, u8 addr) | |
119 | { | |
9a3b7a42 | 120 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
121 | struct phonet_device *pnd; |
122 | int err = 0; | |
123 | ||
9a3b7a42 | 124 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
125 | /* Find or create Phonet-specific device data */ |
126 | pnd = __phonet_get(dev); | |
127 | if (pnd == NULL) | |
128 | pnd = __phonet_device_alloc(dev); | |
129 | if (unlikely(pnd == NULL)) | |
130 | err = -ENOMEM; | |
131 | else if (test_and_set_bit(addr >> 2, pnd->addrs)) | |
132 | err = -EEXIST; | |
9a3b7a42 | 133 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
134 | return err; |
135 | } | |
136 | ||
137 | int phonet_address_del(struct net_device *dev, u8 addr) | |
138 | { | |
9a3b7a42 | 139 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
140 | struct phonet_device *pnd; |
141 | int err = 0; | |
142 | ||
9a3b7a42 | 143 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
144 | pnd = __phonet_get(dev); |
145 | if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) | |
146 | err = -EADDRNOTAVAIL; | |
2be6fa4c RDC |
147 | else if (bitmap_empty(pnd->addrs, 64)) { |
148 | list_del(&pnd->list); | |
149 | kfree(pnd); | |
150 | } | |
9a3b7a42 | 151 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
152 | return err; |
153 | } | |
154 | ||
155 | /* Gets a source address toward a destination, through a interface. */ | |
156 | u8 phonet_address_get(struct net_device *dev, u8 addr) | |
157 | { | |
9a3b7a42 | 158 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
159 | struct phonet_device *pnd; |
160 | ||
9a3b7a42 | 161 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
162 | pnd = __phonet_get(dev); |
163 | if (pnd) { | |
164 | BUG_ON(bitmap_empty(pnd->addrs, 64)); | |
165 | ||
166 | /* Use same source address as destination, if possible */ | |
167 | if (!test_bit(addr >> 2, pnd->addrs)) | |
168 | addr = find_first_bit(pnd->addrs, 64) << 2; | |
169 | } else | |
170 | addr = PN_NO_ADDR; | |
9a3b7a42 | 171 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
172 | return addr; |
173 | } | |
174 | ||
52404881 | 175 | int phonet_address_lookup(struct net *net, u8 addr) |
f8ff6028 | 176 | { |
9a3b7a42 | 177 | struct phonet_device_list *pndevs = phonet_device_list(net); |
f8ff6028 | 178 | struct phonet_device *pnd; |
9a3b7a42 | 179 | int err = -EADDRNOTAVAIL; |
f8ff6028 | 180 | |
9a3b7a42 | 181 | spin_lock_bh(&pndevs->lock); |
182 | list_for_each_entry(pnd, &pndevs->list, list) { | |
f8ff6028 RDC |
183 | /* Don't allow unregistering devices! */ |
184 | if ((pnd->netdev->reg_state != NETREG_REGISTERED) || | |
185 | ((pnd->netdev->flags & IFF_UP)) != IFF_UP) | |
186 | continue; | |
187 | ||
188 | if (test_bit(addr >> 2, pnd->addrs)) { | |
9a3b7a42 | 189 | err = 0; |
190 | goto found; | |
f8ff6028 RDC |
191 | } |
192 | } | |
9a3b7a42 | 193 | found: |
194 | spin_unlock_bh(&pndevs->lock); | |
195 | return err; | |
f8ff6028 RDC |
196 | } |
197 | ||
198 | /* notify Phonet of device events */ | |
199 | static int phonet_device_notify(struct notifier_block *me, unsigned long what, | |
200 | void *arg) | |
201 | { | |
202 | struct net_device *dev = arg; | |
203 | ||
2be6fa4c RDC |
204 | if (what == NETDEV_UNREGISTER) |
205 | phonet_device_destroy(dev); | |
f8ff6028 RDC |
206 | return 0; |
207 | ||
208 | } | |
209 | ||
210 | static struct notifier_block phonet_device_notifier = { | |
211 | .notifier_call = phonet_device_notify, | |
212 | .priority = 0, | |
213 | }; | |
214 | ||
9a3b7a42 | 215 | /* Per-namespace Phonet devices handling */ |
216 | static int phonet_init_net(struct net *net) | |
217 | { | |
218 | struct phonet_net *pnn = kmalloc(sizeof(*pnn), GFP_KERNEL); | |
219 | if (!pnn) | |
220 | return -ENOMEM; | |
221 | ||
c1dc13e9 RDC |
222 | if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) { |
223 | kfree(pnn); | |
224 | return -ENOMEM; | |
225 | } | |
226 | ||
9a3b7a42 | 227 | INIT_LIST_HEAD(&pnn->pndevs.list); |
228 | spin_lock_init(&pnn->pndevs.lock); | |
229 | net_assign_generic(net, phonet_net_id, pnn); | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static void phonet_exit_net(struct net *net) | |
234 | { | |
235 | struct phonet_net *pnn = net_generic(net, phonet_net_id); | |
2be6fa4c | 236 | struct net_device *dev; |
9a3b7a42 | 237 | |
2be6fa4c RDC |
238 | rtnl_lock(); |
239 | for_each_netdev(net, dev) | |
240 | phonet_device_destroy(dev); | |
241 | rtnl_unlock(); | |
c1dc13e9 RDC |
242 | |
243 | proc_net_remove(net, "phonet"); | |
9a3b7a42 | 244 | kfree(pnn); |
245 | } | |
246 | ||
247 | static struct pernet_operations phonet_net_ops = { | |
248 | .init = phonet_init_net, | |
249 | .exit = phonet_exit_net, | |
250 | }; | |
251 | ||
f8ff6028 | 252 | /* Initialize Phonet devices list */ |
76e02cf6 | 253 | int __init phonet_device_init(void) |
f8ff6028 | 254 | { |
9a3b7a42 | 255 | int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops); |
256 | if (err) | |
257 | return err; | |
660f706d | 258 | |
f8ff6028 | 259 | register_netdevice_notifier(&phonet_device_notifier); |
660f706d | 260 | err = phonet_netlink_register(); |
261 | if (err) | |
262 | phonet_device_exit(); | |
263 | return err; | |
f8ff6028 RDC |
264 | } |
265 | ||
266 | void phonet_device_exit(void) | |
267 | { | |
f8ff6028 | 268 | rtnl_unregister_all(PF_PHONET); |
6530e0fe | 269 | unregister_netdevice_notifier(&phonet_device_notifier); |
9a3b7a42 | 270 | unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops); |
f8ff6028 | 271 | } |