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