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1eaa9d03 DES |
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> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1eaa9d03 DES |
27 | #include <net/netlink.h> |
28 | #include <net/genetlink.h> | |
29 | #include <net/wpan-phy.h> | |
bb1cafb8 DES |
30 | #include <net/af_ieee802154.h> |
31 | #include <net/ieee802154_netdev.h> | |
32 | #include <net/rtnetlink.h> /* for rtnl_{un,}lock */ | |
1eaa9d03 DES |
33 | #include <linux/nl802154.h> |
34 | ||
35 | #include "ieee802154.h" | |
36 | ||
37 | static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid, | |
38 | u32 seq, int flags, struct wpan_phy *phy) | |
39 | { | |
40 | void *hdr; | |
41 | int i, pages = 0; | |
42 | uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL); | |
43 | ||
44 | pr_debug("%s\n", __func__); | |
45 | ||
46 | if (!buf) | |
b9cabe52 | 47 | return -EMSGSIZE; |
1eaa9d03 DES |
48 | |
49 | hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags, | |
50 | IEEE802154_LIST_PHY); | |
51 | if (!hdr) | |
52 | goto out; | |
53 | ||
54 | mutex_lock(&phy->pib_lock); | |
55 | NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); | |
56 | ||
57 | NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page); | |
58 | NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel); | |
59 | for (i = 0; i < 32; i++) { | |
60 | if (phy->channels_supported[i]) | |
61 | buf[pages++] = phy->channels_supported[i] | (i << 27); | |
62 | } | |
63 | if (pages) | |
64 | NLA_PUT(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST, | |
65 | pages * sizeof(uint32_t), buf); | |
66 | ||
67 | mutex_unlock(&phy->pib_lock); | |
b9cabe52 | 68 | kfree(buf); |
1eaa9d03 DES |
69 | return genlmsg_end(msg, hdr); |
70 | ||
71 | nla_put_failure: | |
72 | mutex_unlock(&phy->pib_lock); | |
73 | genlmsg_cancel(msg, hdr); | |
74 | out: | |
75 | kfree(buf); | |
76 | return -EMSGSIZE; | |
77 | } | |
78 | ||
79 | static int ieee802154_list_phy(struct sk_buff *skb, | |
80 | struct genl_info *info) | |
81 | { | |
82 | /* Request for interface name, index, type, IEEE address, | |
83 | PAN Id, short address */ | |
84 | struct sk_buff *msg; | |
85 | struct wpan_phy *phy; | |
86 | const char *name; | |
87 | int rc = -ENOBUFS; | |
88 | ||
89 | pr_debug("%s\n", __func__); | |
90 | ||
91 | if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) | |
92 | return -EINVAL; | |
93 | ||
94 | name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); | |
95 | if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') | |
96 | return -EINVAL; /* phy name should be null-terminated */ | |
97 | ||
98 | ||
99 | phy = wpan_phy_find(name); | |
100 | if (!phy) | |
101 | return -ENODEV; | |
102 | ||
103 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
104 | if (!msg) | |
105 | goto out_dev; | |
106 | ||
107 | rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq, | |
108 | 0, phy); | |
109 | if (rc < 0) | |
110 | goto out_free; | |
111 | ||
112 | wpan_phy_put(phy); | |
113 | ||
114 | return genlmsg_reply(msg, info); | |
115 | out_free: | |
116 | nlmsg_free(msg); | |
117 | out_dev: | |
118 | wpan_phy_put(phy); | |
119 | return rc; | |
120 | ||
121 | } | |
122 | ||
123 | struct dump_phy_data { | |
124 | struct sk_buff *skb; | |
125 | struct netlink_callback *cb; | |
126 | int idx, s_idx; | |
127 | }; | |
128 | ||
129 | static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data) | |
130 | { | |
131 | int rc; | |
132 | struct dump_phy_data *data = _data; | |
133 | ||
134 | pr_debug("%s\n", __func__); | |
135 | ||
136 | if (data->idx++ < data->s_idx) | |
137 | return 0; | |
138 | ||
139 | rc = ieee802154_nl_fill_phy(data->skb, | |
140 | NETLINK_CB(data->cb->skb).pid, | |
141 | data->cb->nlh->nlmsg_seq, | |
142 | NLM_F_MULTI, | |
143 | phy); | |
144 | ||
145 | if (rc < 0) { | |
146 | data->idx--; | |
147 | return rc; | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int ieee802154_dump_phy(struct sk_buff *skb, | |
154 | struct netlink_callback *cb) | |
155 | { | |
156 | struct dump_phy_data data = { | |
157 | .cb = cb, | |
158 | .skb = skb, | |
159 | .s_idx = cb->args[0], | |
160 | .idx = 0, | |
161 | }; | |
162 | ||
163 | pr_debug("%s\n", __func__); | |
164 | ||
165 | wpan_phy_for_each(ieee802154_dump_phy_iter, &data); | |
166 | ||
167 | cb->args[0] = data.idx; | |
168 | ||
169 | return skb->len; | |
170 | } | |
171 | ||
bb1cafb8 DES |
172 | static int ieee802154_add_iface(struct sk_buff *skb, |
173 | struct genl_info *info) | |
174 | { | |
175 | struct sk_buff *msg; | |
176 | struct wpan_phy *phy; | |
177 | const char *name; | |
178 | const char *devname; | |
179 | int rc = -ENOBUFS; | |
180 | struct net_device *dev; | |
181 | ||
182 | pr_debug("%s\n", __func__); | |
183 | ||
184 | if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) | |
185 | return -EINVAL; | |
186 | ||
187 | name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); | |
188 | if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') | |
189 | return -EINVAL; /* phy name should be null-terminated */ | |
190 | ||
191 | if (info->attrs[IEEE802154_ATTR_DEV_NAME]) { | |
192 | devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); | |
193 | if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] | |
194 | != '\0') | |
195 | return -EINVAL; /* phy name should be null-terminated */ | |
196 | } else { | |
197 | devname = "wpan%d"; | |
198 | } | |
199 | ||
200 | if (strlen(devname) >= IFNAMSIZ) | |
201 | return -ENAMETOOLONG; | |
202 | ||
203 | phy = wpan_phy_find(name); | |
204 | if (!phy) | |
205 | return -ENODEV; | |
206 | ||
207 | msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE); | |
208 | if (!msg) | |
209 | goto out_dev; | |
210 | ||
211 | if (!phy->add_iface) { | |
212 | rc = -EINVAL; | |
213 | goto nla_put_failure; | |
214 | } | |
215 | ||
216 | dev = phy->add_iface(phy, devname); | |
217 | if (IS_ERR(dev)) { | |
218 | rc = PTR_ERR(dev); | |
219 | goto nla_put_failure; | |
220 | } | |
221 | ||
222 | NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); | |
223 | NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name); | |
224 | ||
225 | dev_put(dev); | |
226 | ||
227 | wpan_phy_put(phy); | |
228 | ||
229 | return ieee802154_nl_reply(msg, info); | |
230 | ||
231 | nla_put_failure: | |
232 | nlmsg_free(msg); | |
233 | out_dev: | |
234 | wpan_phy_put(phy); | |
235 | return rc; | |
236 | } | |
237 | ||
238 | static int ieee802154_del_iface(struct sk_buff *skb, | |
239 | struct genl_info *info) | |
240 | { | |
241 | struct sk_buff *msg; | |
242 | struct wpan_phy *phy; | |
243 | const char *name; | |
244 | int rc; | |
245 | struct net_device *dev; | |
246 | ||
247 | pr_debug("%s\n", __func__); | |
248 | ||
249 | if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) | |
250 | return -EINVAL; | |
251 | ||
252 | name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); | |
253 | if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') | |
254 | return -EINVAL; /* name should be null-terminated */ | |
255 | ||
256 | dev = dev_get_by_name(genl_info_net(info), name); | |
257 | if (!dev) | |
258 | return -ENODEV; | |
259 | ||
260 | phy = ieee802154_mlme_ops(dev)->get_phy(dev); | |
261 | BUG_ON(!phy); | |
262 | ||
263 | rc = -EINVAL; | |
264 | /* phy name is optional, but should be checked if it's given */ | |
265 | if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { | |
266 | struct wpan_phy *phy2; | |
267 | ||
268 | const char *pname = | |
269 | nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); | |
270 | if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] | |
271 | != '\0') | |
272 | /* name should be null-terminated */ | |
273 | goto out_dev; | |
274 | ||
275 | phy2 = wpan_phy_find(pname); | |
276 | if (!phy2) | |
277 | goto out_dev; | |
278 | ||
279 | if (phy != phy2) { | |
280 | wpan_phy_put(phy2); | |
281 | goto out_dev; | |
282 | } | |
283 | } | |
284 | ||
285 | rc = -ENOBUFS; | |
286 | ||
287 | msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); | |
288 | if (!msg) | |
289 | goto out_dev; | |
290 | ||
291 | if (!phy->del_iface) { | |
292 | rc = -EINVAL; | |
293 | goto nla_put_failure; | |
294 | } | |
295 | ||
296 | rtnl_lock(); | |
297 | phy->del_iface(phy, dev); | |
298 | ||
299 | /* We don't have device anymore */ | |
300 | dev_put(dev); | |
301 | dev = NULL; | |
302 | ||
303 | rtnl_unlock(); | |
304 | ||
305 | ||
306 | NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); | |
307 | NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name); | |
308 | ||
309 | wpan_phy_put(phy); | |
310 | ||
311 | return ieee802154_nl_reply(msg, info); | |
312 | ||
313 | nla_put_failure: | |
314 | nlmsg_free(msg); | |
315 | out_dev: | |
316 | wpan_phy_put(phy); | |
317 | if (dev) | |
318 | dev_put(dev); | |
319 | ||
320 | return rc; | |
321 | } | |
322 | ||
1eaa9d03 DES |
323 | static struct genl_ops ieee802154_phy_ops[] = { |
324 | IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy, | |
325 | ieee802154_dump_phy), | |
bb1cafb8 DES |
326 | IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface), |
327 | IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface), | |
1eaa9d03 DES |
328 | }; |
329 | ||
330 | /* | |
331 | * No need to unregister as family unregistration will do it. | |
332 | */ | |
333 | int nl802154_phy_register(void) | |
334 | { | |
335 | int i; | |
336 | int rc; | |
337 | ||
338 | for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) { | |
339 | rc = genl_register_ops(&nl802154_family, | |
340 | &ieee802154_phy_ops[i]); | |
341 | if (rc) | |
342 | return rc; | |
343 | } | |
344 | ||
345 | return 0; | |
346 | } |