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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> | |
30 | #include <net/sock.h> | |
9a3b7a42 | 31 | #include <net/netns/generic.h> |
f8ff6028 RDC |
32 | #include <net/phonet/pn_dev.h> |
33 | ||
9a3b7a42 | 34 | struct phonet_net { |
35 | struct phonet_device_list pndevs; | |
f8ff6028 RDC |
36 | }; |
37 | ||
9a3b7a42 | 38 | int phonet_net_id; |
39 | ||
40 | struct phonet_device_list *phonet_device_list(struct net *net) | |
41 | { | |
42 | struct phonet_net *pnn = net_generic(net, phonet_net_id); | |
43 | return &pnn->pndevs; | |
44 | } | |
45 | ||
f8ff6028 RDC |
46 | /* Allocate new Phonet device. */ |
47 | static struct phonet_device *__phonet_device_alloc(struct net_device *dev) | |
48 | { | |
9a3b7a42 | 49 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
50 | struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC); |
51 | if (pnd == NULL) | |
52 | return NULL; | |
53 | pnd->netdev = dev; | |
54 | bitmap_zero(pnd->addrs, 64); | |
55 | ||
9a3b7a42 | 56 | list_add(&pnd->list, &pndevs->list); |
f8ff6028 RDC |
57 | return pnd; |
58 | } | |
59 | ||
60 | static struct phonet_device *__phonet_get(struct net_device *dev) | |
61 | { | |
9a3b7a42 | 62 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
63 | struct phonet_device *pnd; |
64 | ||
9a3b7a42 | 65 | list_for_each_entry(pnd, &pndevs->list, list) { |
f8ff6028 RDC |
66 | if (pnd->netdev == dev) |
67 | return pnd; | |
68 | } | |
69 | return NULL; | |
70 | } | |
71 | ||
2be6fa4c | 72 | static void phonet_device_destroy(struct net_device *dev) |
f8ff6028 | 73 | { |
2be6fa4c RDC |
74 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
75 | struct phonet_device *pnd; | |
76 | ||
77 | ASSERT_RTNL(); | |
78 | ||
79 | spin_lock_bh(&pndevs->lock); | |
80 | pnd = __phonet_get(dev); | |
81 | if (pnd) | |
82 | list_del(&pnd->list); | |
83 | spin_unlock_bh(&pndevs->lock); | |
84 | ||
85 | if (pnd) { | |
86 | u8 addr; | |
87 | ||
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); | |
91 | kfree(pnd); | |
92 | } | |
f8ff6028 RDC |
93 | } |
94 | ||
95 | struct net_device *phonet_device_get(struct net *net) | |
96 | { | |
9a3b7a42 | 97 | struct phonet_device_list *pndevs = phonet_device_list(net); |
f8ff6028 RDC |
98 | struct phonet_device *pnd; |
99 | struct net_device *dev; | |
100 | ||
9a3b7a42 | 101 | spin_lock_bh(&pndevs->lock); |
102 | list_for_each_entry(pnd, &pndevs->list, list) { | |
f8ff6028 RDC |
103 | dev = pnd->netdev; |
104 | BUG_ON(!dev); | |
105 | ||
9a3b7a42 | 106 | if ((dev->reg_state == NETREG_REGISTERED) && |
f8ff6028 RDC |
107 | ((pnd->netdev->flags & IFF_UP)) == IFF_UP) |
108 | break; | |
109 | dev = NULL; | |
110 | } | |
111 | if (dev) | |
112 | dev_hold(dev); | |
9a3b7a42 | 113 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
114 | return dev; |
115 | } | |
116 | ||
117 | int phonet_address_add(struct net_device *dev, u8 addr) | |
118 | { | |
9a3b7a42 | 119 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
120 | struct phonet_device *pnd; |
121 | int err = 0; | |
122 | ||
9a3b7a42 | 123 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
124 | /* Find or create Phonet-specific device data */ |
125 | pnd = __phonet_get(dev); | |
126 | if (pnd == NULL) | |
127 | pnd = __phonet_device_alloc(dev); | |
128 | if (unlikely(pnd == NULL)) | |
129 | err = -ENOMEM; | |
130 | else if (test_and_set_bit(addr >> 2, pnd->addrs)) | |
131 | err = -EEXIST; | |
9a3b7a42 | 132 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
133 | return err; |
134 | } | |
135 | ||
136 | int phonet_address_del(struct net_device *dev, u8 addr) | |
137 | { | |
9a3b7a42 | 138 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
139 | struct phonet_device *pnd; |
140 | int err = 0; | |
141 | ||
9a3b7a42 | 142 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
143 | pnd = __phonet_get(dev); |
144 | if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) | |
145 | err = -EADDRNOTAVAIL; | |
2be6fa4c RDC |
146 | else if (bitmap_empty(pnd->addrs, 64)) { |
147 | list_del(&pnd->list); | |
148 | kfree(pnd); | |
149 | } | |
9a3b7a42 | 150 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
151 | return err; |
152 | } | |
153 | ||
154 | /* Gets a source address toward a destination, through a interface. */ | |
155 | u8 phonet_address_get(struct net_device *dev, u8 addr) | |
156 | { | |
9a3b7a42 | 157 | struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev)); |
f8ff6028 RDC |
158 | struct phonet_device *pnd; |
159 | ||
9a3b7a42 | 160 | spin_lock_bh(&pndevs->lock); |
f8ff6028 RDC |
161 | pnd = __phonet_get(dev); |
162 | if (pnd) { | |
163 | BUG_ON(bitmap_empty(pnd->addrs, 64)); | |
164 | ||
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; | |
168 | } else | |
169 | addr = PN_NO_ADDR; | |
9a3b7a42 | 170 | spin_unlock_bh(&pndevs->lock); |
f8ff6028 RDC |
171 | return addr; |
172 | } | |
173 | ||
52404881 | 174 | int phonet_address_lookup(struct net *net, u8 addr) |
f8ff6028 | 175 | { |
9a3b7a42 | 176 | struct phonet_device_list *pndevs = phonet_device_list(net); |
f8ff6028 | 177 | struct phonet_device *pnd; |
9a3b7a42 | 178 | int err = -EADDRNOTAVAIL; |
f8ff6028 | 179 | |
9a3b7a42 | 180 | spin_lock_bh(&pndevs->lock); |
181 | list_for_each_entry(pnd, &pndevs->list, list) { | |
f8ff6028 RDC |
182 | /* Don't allow unregistering devices! */ |
183 | if ((pnd->netdev->reg_state != NETREG_REGISTERED) || | |
184 | ((pnd->netdev->flags & IFF_UP)) != IFF_UP) | |
185 | continue; | |
186 | ||
187 | if (test_bit(addr >> 2, pnd->addrs)) { | |
9a3b7a42 | 188 | err = 0; |
189 | goto found; | |
f8ff6028 RDC |
190 | } |
191 | } | |
9a3b7a42 | 192 | found: |
193 | spin_unlock_bh(&pndevs->lock); | |
194 | return err; | |
f8ff6028 RDC |
195 | } |
196 | ||
197 | /* notify Phonet of device events */ | |
198 | static int phonet_device_notify(struct notifier_block *me, unsigned long what, | |
199 | void *arg) | |
200 | { | |
201 | struct net_device *dev = arg; | |
202 | ||
2be6fa4c RDC |
203 | if (what == NETDEV_UNREGISTER) |
204 | phonet_device_destroy(dev); | |
f8ff6028 RDC |
205 | return 0; |
206 | ||
207 | } | |
208 | ||
209 | static struct notifier_block phonet_device_notifier = { | |
210 | .notifier_call = phonet_device_notify, | |
211 | .priority = 0, | |
212 | }; | |
213 | ||
9a3b7a42 | 214 | /* Per-namespace Phonet devices handling */ |
215 | static int phonet_init_net(struct net *net) | |
216 | { | |
217 | struct phonet_net *pnn = kmalloc(sizeof(*pnn), GFP_KERNEL); | |
218 | if (!pnn) | |
219 | return -ENOMEM; | |
220 | ||
c1dc13e9 RDC |
221 | if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) { |
222 | kfree(pnn); | |
223 | return -ENOMEM; | |
224 | } | |
225 | ||
9a3b7a42 | 226 | INIT_LIST_HEAD(&pnn->pndevs.list); |
227 | spin_lock_init(&pnn->pndevs.lock); | |
228 | net_assign_generic(net, phonet_net_id, pnn); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static void phonet_exit_net(struct net *net) | |
233 | { | |
234 | struct phonet_net *pnn = net_generic(net, phonet_net_id); | |
2be6fa4c | 235 | struct net_device *dev; |
9a3b7a42 | 236 | |
2be6fa4c RDC |
237 | rtnl_lock(); |
238 | for_each_netdev(net, dev) | |
239 | phonet_device_destroy(dev); | |
240 | rtnl_unlock(); | |
c1dc13e9 RDC |
241 | |
242 | proc_net_remove(net, "phonet"); | |
9a3b7a42 | 243 | kfree(pnn); |
244 | } | |
245 | ||
246 | static struct pernet_operations phonet_net_ops = { | |
247 | .init = phonet_init_net, | |
248 | .exit = phonet_exit_net, | |
249 | }; | |
250 | ||
f8ff6028 | 251 | /* Initialize Phonet devices list */ |
76e02cf6 | 252 | int __init phonet_device_init(void) |
f8ff6028 | 253 | { |
9a3b7a42 | 254 | int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops); |
255 | if (err) | |
256 | return err; | |
660f706d | 257 | |
f8ff6028 | 258 | register_netdevice_notifier(&phonet_device_notifier); |
660f706d | 259 | err = phonet_netlink_register(); |
260 | if (err) | |
261 | phonet_device_exit(); | |
262 | return err; | |
f8ff6028 RDC |
263 | } |
264 | ||
265 | void phonet_device_exit(void) | |
266 | { | |
f8ff6028 | 267 | rtnl_unregister_all(PF_PHONET); |
6530e0fe | 268 | unregister_netdevice_notifier(&phonet_device_notifier); |
9a3b7a42 | 269 | unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops); |
f8ff6028 | 270 | } |