net: check the length of the socket address passed to connect(2)
[linux-2.6.git] / net / ieee802154 / nl-phy.c
1 /*
2  * Netlink inteface for IEEE 802.15.4 stack
3  *
4  * Copyright 2007, 2008 Siemens AG
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Written by:
20  * Sergey Lapin <slapin@ossfans.org>
21  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
22  * Maxim Osipov <maxim.osipov@siemens.com>
23  */
24
25 #include <linux/kernel.h>
26 #include <net/netlink.h>
27 #include <net/genetlink.h>
28 #include <net/wpan-phy.h>
29 #include <net/af_ieee802154.h>
30 #include <net/ieee802154_netdev.h>
31 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */
32 #include <linux/nl802154.h>
33
34 #include "ieee802154.h"
35
36 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
37         u32 seq, int flags, struct wpan_phy *phy)
38 {
39         void *hdr;
40         int i, pages = 0;
41         uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);
42
43         pr_debug("%s\n", __func__);
44
45         if (!buf)
46                 goto out;
47
48         hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
49                 IEEE802154_LIST_PHY);
50         if (!hdr)
51                 goto out;
52
53         mutex_lock(&phy->pib_lock);
54         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
55
56         NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page);
57         NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel);
58         for (i = 0; i < 32; i++) {
59                 if (phy->channels_supported[i])
60                         buf[pages++] = phy->channels_supported[i] | (i << 27);
61         }
62         if (pages)
63                 NLA_PUT(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
64                                 pages * sizeof(uint32_t), buf);
65
66         mutex_unlock(&phy->pib_lock);
67         return genlmsg_end(msg, hdr);
68
69 nla_put_failure:
70         mutex_unlock(&phy->pib_lock);
71         genlmsg_cancel(msg, hdr);
72 out:
73         kfree(buf);
74         return -EMSGSIZE;
75 }
76
77 static int ieee802154_list_phy(struct sk_buff *skb,
78         struct genl_info *info)
79 {
80         /* Request for interface name, index, type, IEEE address,
81            PAN Id, short address */
82         struct sk_buff *msg;
83         struct wpan_phy *phy;
84         const char *name;
85         int rc = -ENOBUFS;
86
87         pr_debug("%s\n", __func__);
88
89         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
90                 return -EINVAL;
91
92         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
93         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
94                 return -EINVAL; /* phy name should be null-terminated */
95
96
97         phy = wpan_phy_find(name);
98         if (!phy)
99                 return -ENODEV;
100
101         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
102         if (!msg)
103                 goto out_dev;
104
105         rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq,
106                         0, phy);
107         if (rc < 0)
108                 goto out_free;
109
110         wpan_phy_put(phy);
111
112         return genlmsg_reply(msg, info);
113 out_free:
114         nlmsg_free(msg);
115 out_dev:
116         wpan_phy_put(phy);
117         return rc;
118
119 }
120
121 struct dump_phy_data {
122         struct sk_buff *skb;
123         struct netlink_callback *cb;
124         int idx, s_idx;
125 };
126
127 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
128 {
129         int rc;
130         struct dump_phy_data *data = _data;
131
132         pr_debug("%s\n", __func__);
133
134         if (data->idx++ < data->s_idx)
135                 return 0;
136
137         rc = ieee802154_nl_fill_phy(data->skb,
138                         NETLINK_CB(data->cb->skb).pid,
139                         data->cb->nlh->nlmsg_seq,
140                         NLM_F_MULTI,
141                         phy);
142
143         if (rc < 0) {
144                 data->idx--;
145                 return rc;
146         }
147
148         return 0;
149 }
150
151 static int ieee802154_dump_phy(struct sk_buff *skb,
152         struct netlink_callback *cb)
153 {
154         struct dump_phy_data data = {
155                 .cb = cb,
156                 .skb = skb,
157                 .s_idx = cb->args[0],
158                 .idx = 0,
159         };
160
161         pr_debug("%s\n", __func__);
162
163         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
164
165         cb->args[0] = data.idx;
166
167         return skb->len;
168 }
169
170 static int ieee802154_add_iface(struct sk_buff *skb,
171                 struct genl_info *info)
172 {
173         struct sk_buff *msg;
174         struct wpan_phy *phy;
175         const char *name;
176         const char *devname;
177         int rc = -ENOBUFS;
178         struct net_device *dev;
179
180         pr_debug("%s\n", __func__);
181
182         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
183                 return -EINVAL;
184
185         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
186         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
187                 return -EINVAL; /* phy name should be null-terminated */
188
189         if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
190                 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
191                 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
192                                 != '\0')
193                         return -EINVAL; /* phy name should be null-terminated */
194         } else  {
195                 devname = "wpan%d";
196         }
197
198         if (strlen(devname) >= IFNAMSIZ)
199                 return -ENAMETOOLONG;
200
201         phy = wpan_phy_find(name);
202         if (!phy)
203                 return -ENODEV;
204
205         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
206         if (!msg)
207                 goto out_dev;
208
209         if (!phy->add_iface) {
210                 rc = -EINVAL;
211                 goto nla_put_failure;
212         }
213
214         dev = phy->add_iface(phy, devname);
215         if (IS_ERR(dev)) {
216                 rc = PTR_ERR(dev);
217                 goto nla_put_failure;
218         }
219
220         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
221         NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
222
223         dev_put(dev);
224
225         wpan_phy_put(phy);
226
227         return ieee802154_nl_reply(msg, info);
228
229 nla_put_failure:
230         nlmsg_free(msg);
231 out_dev:
232         wpan_phy_put(phy);
233         return rc;
234 }
235
236 static int ieee802154_del_iface(struct sk_buff *skb,
237                 struct genl_info *info)
238 {
239         struct sk_buff *msg;
240         struct wpan_phy *phy;
241         const char *name;
242         int rc;
243         struct net_device *dev;
244
245         pr_debug("%s\n", __func__);
246
247         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
248                 return -EINVAL;
249
250         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
251         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
252                 return -EINVAL; /* name should be null-terminated */
253
254         dev = dev_get_by_name(genl_info_net(info), name);
255         if (!dev)
256                 return -ENODEV;
257
258         phy = ieee802154_mlme_ops(dev)->get_phy(dev);
259         BUG_ON(!phy);
260
261         rc = -EINVAL;
262         /* phy name is optional, but should be checked if it's given */
263         if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
264                 struct wpan_phy *phy2;
265
266                 const char *pname =
267                         nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
268                 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
269                                 != '\0')
270                         /* name should be null-terminated */
271                         goto out_dev;
272
273                 phy2 = wpan_phy_find(pname);
274                 if (!phy2)
275                         goto out_dev;
276
277                 if (phy != phy2) {
278                         wpan_phy_put(phy2);
279                         goto out_dev;
280                 }
281         }
282
283         rc = -ENOBUFS;
284
285         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
286         if (!msg)
287                 goto out_dev;
288
289         if (!phy->del_iface) {
290                 rc = -EINVAL;
291                 goto nla_put_failure;
292         }
293
294         rtnl_lock();
295         phy->del_iface(phy, dev);
296
297         /* We don't have device anymore */
298         dev_put(dev);
299         dev = NULL;
300
301         rtnl_unlock();
302
303
304         NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
305         NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name);
306
307         wpan_phy_put(phy);
308
309         return ieee802154_nl_reply(msg, info);
310
311 nla_put_failure:
312         nlmsg_free(msg);
313 out_dev:
314         wpan_phy_put(phy);
315         if (dev)
316                 dev_put(dev);
317
318         return rc;
319 }
320
321 static struct genl_ops ieee802154_phy_ops[] = {
322         IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
323                                                         ieee802154_dump_phy),
324         IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
325         IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
326 };
327
328 /*
329  * No need to unregister as family unregistration will do it.
330  */
331 int nl802154_phy_register(void)
332 {
333         int i;
334         int rc;
335
336         for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
337                 rc = genl_register_ops(&nl802154_family,
338                                 &ieee802154_phy_ops[i]);
339                 if (rc)
340                         return rc;
341         }
342
343         return 0;
344 }