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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 <linux/slab.h> |
27 | #include <linux/if_arp.h> |
28 | #include <net/netlink.h> |
29 | #include <net/genetlink.h> |
30 | #include <net/wpan-phy.h> |
31 | #include <net/af_ieee802154.h> |
32 | #include <net/ieee802154_netdev.h> |
33 | #include <net/rtnetlink.h> /* for rtnl_{un,}lock */ |
34 | #include <linux/nl802154.h> |
35 | |
36 | #include "ieee802154.h" |
37 | |
38 | static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid, |
39 | u32 seq, int flags, struct wpan_phy *phy) |
40 | { |
41 | void *hdr; |
42 | int i, pages = 0; |
43 | uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL); |
44 | |
45 | pr_debug("%s\n", __func__); |
46 | |
47 | if (!buf) |
48 | return -EMSGSIZE; |
49 | |
50 | hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags, |
51 | IEEE802154_LIST_PHY); |
52 | if (!hdr) |
53 | goto out; |
54 | |
55 | mutex_lock(&phy->pib_lock); |
56 | if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || |
57 | nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) || |
58 | nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel)) |
59 | goto nla_put_failure; |
60 | for (i = 0; i < 32; i++) { |
61 | if (phy->channels_supported[i]) |
62 | buf[pages++] = phy->channels_supported[i] | (i << 27); |
63 | } |
64 | if (pages && |
65 | nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST, |
66 | pages * sizeof(uint32_t), buf)) |
67 | goto nla_put_failure; |
68 | mutex_unlock(&phy->pib_lock); |
69 | kfree(buf); |
70 | return genlmsg_end(msg, hdr); |
71 | |
72 | nla_put_failure: |
73 | mutex_unlock(&phy->pib_lock); |
74 | genlmsg_cancel(msg, hdr); |
75 | out: |
76 | kfree(buf); |
77 | return -EMSGSIZE; |
78 | } |
79 | |
80 | static int ieee802154_list_phy(struct sk_buff *skb, |
81 | struct genl_info *info) |
82 | { |
83 | /* Request for interface name, index, type, IEEE address, |
84 | PAN Id, short address */ |
85 | struct sk_buff *msg; |
86 | struct wpan_phy *phy; |
87 | const char *name; |
88 | int rc = -ENOBUFS; |
89 | |
90 | pr_debug("%s\n", __func__); |
91 | |
92 | if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) |
93 | return -EINVAL; |
94 | |
95 | name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); |
96 | if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') |
97 | return -EINVAL; /* phy name should be null-terminated */ |
98 | |
99 | |
100 | phy = wpan_phy_find(name); |
101 | if (!phy) |
102 | return -ENODEV; |
103 | |
104 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
105 | if (!msg) |
106 | goto out_dev; |
107 | |
108 | rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq, |
109 | 0, phy); |
110 | if (rc < 0) |
111 | goto out_free; |
112 | |
113 | wpan_phy_put(phy); |
114 | |
115 | return genlmsg_reply(msg, info); |
116 | out_free: |
117 | nlmsg_free(msg); |
118 | out_dev: |
119 | wpan_phy_put(phy); |
120 | return rc; |
121 | |
122 | } |
123 | |
124 | struct dump_phy_data { |
125 | struct sk_buff *skb; |
126 | struct netlink_callback *cb; |
127 | int idx, s_idx; |
128 | }; |
129 | |
130 | static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data) |
131 | { |
132 | int rc; |
133 | struct dump_phy_data *data = _data; |
134 | |
135 | pr_debug("%s\n", __func__); |
136 | |
137 | if (data->idx++ < data->s_idx) |
138 | return 0; |
139 | |
140 | rc = ieee802154_nl_fill_phy(data->skb, |
141 | NETLINK_CB(data->cb->skb).portid, |
142 | data->cb->nlh->nlmsg_seq, |
143 | NLM_F_MULTI, |
144 | phy); |
145 | |
146 | if (rc < 0) { |
147 | data->idx--; |
148 | return rc; |
149 | } |
150 | |
151 | return 0; |
152 | } |
153 | |
154 | static int ieee802154_dump_phy(struct sk_buff *skb, |
155 | struct netlink_callback *cb) |
156 | { |
157 | struct dump_phy_data data = { |
158 | .cb = cb, |
159 | .skb = skb, |
160 | .s_idx = cb->args[0], |
161 | .idx = 0, |
162 | }; |
163 | |
164 | pr_debug("%s\n", __func__); |
165 | |
166 | wpan_phy_for_each(ieee802154_dump_phy_iter, &data); |
167 | |
168 | cb->args[0] = data.idx; |
169 | |
170 | return skb->len; |
171 | } |
172 | |
173 | static int ieee802154_add_iface(struct sk_buff *skb, |
174 | struct genl_info *info) |
175 | { |
176 | struct sk_buff *msg; |
177 | struct wpan_phy *phy; |
178 | const char *name; |
179 | const char *devname; |
180 | int rc = -ENOBUFS; |
181 | struct net_device *dev; |
182 | int type = __IEEE802154_DEV_INVALID; |
183 | |
184 | pr_debug("%s\n", __func__); |
185 | |
186 | if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) |
187 | return -EINVAL; |
188 | |
189 | name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); |
190 | if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') |
191 | return -EINVAL; /* phy name should be null-terminated */ |
192 | |
193 | if (info->attrs[IEEE802154_ATTR_DEV_NAME]) { |
194 | devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); |
195 | if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] |
196 | != '\0') |
197 | return -EINVAL; /* phy name should be null-terminated */ |
198 | } else { |
199 | devname = "wpan%d"; |
200 | } |
201 | |
202 | if (strlen(devname) >= IFNAMSIZ) |
203 | return -ENAMETOOLONG; |
204 | |
205 | phy = wpan_phy_find(name); |
206 | if (!phy) |
207 | return -ENODEV; |
208 | |
209 | msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE); |
210 | if (!msg) |
211 | goto out_dev; |
212 | |
213 | if (!phy->add_iface) { |
214 | rc = -EINVAL; |
215 | goto nla_put_failure; |
216 | } |
217 | |
218 | if (info->attrs[IEEE802154_ATTR_HW_ADDR] && |
219 | nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) != |
220 | IEEE802154_ADDR_LEN) { |
221 | rc = -EINVAL; |
222 | goto nla_put_failure; |
223 | } |
224 | |
225 | if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) { |
226 | type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]); |
227 | if (type >= __IEEE802154_DEV_MAX) |
228 | return -EINVAL; |
229 | } |
230 | |
231 | dev = phy->add_iface(phy, devname, type); |
232 | if (IS_ERR(dev)) { |
233 | rc = PTR_ERR(dev); |
234 | goto nla_put_failure; |
235 | } |
236 | |
237 | if (info->attrs[IEEE802154_ATTR_HW_ADDR]) { |
238 | struct sockaddr addr; |
239 | |
240 | addr.sa_family = ARPHRD_IEEE802154; |
241 | nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR], |
242 | IEEE802154_ADDR_LEN); |
243 | |
244 | /* |
245 | * strangely enough, some callbacks (inetdev_event) from |
246 | * dev_set_mac_address require RTNL_LOCK |
247 | */ |
248 | rtnl_lock(); |
249 | rc = dev_set_mac_address(dev, &addr); |
250 | rtnl_unlock(); |
251 | if (rc) |
252 | goto dev_unregister; |
253 | } |
254 | |
255 | if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || |
256 | nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name)) |
257 | goto nla_put_failure; |
258 | dev_put(dev); |
259 | |
260 | wpan_phy_put(phy); |
261 | |
262 | return ieee802154_nl_reply(msg, info); |
263 | |
264 | dev_unregister: |
265 | rtnl_lock(); /* del_iface must be called with RTNL lock */ |
266 | phy->del_iface(phy, dev); |
267 | dev_put(dev); |
268 | rtnl_unlock(); |
269 | nla_put_failure: |
270 | nlmsg_free(msg); |
271 | out_dev: |
272 | wpan_phy_put(phy); |
273 | return rc; |
274 | } |
275 | |
276 | static int ieee802154_del_iface(struct sk_buff *skb, |
277 | struct genl_info *info) |
278 | { |
279 | struct sk_buff *msg; |
280 | struct wpan_phy *phy; |
281 | const char *name; |
282 | int rc; |
283 | struct net_device *dev; |
284 | |
285 | pr_debug("%s\n", __func__); |
286 | |
287 | if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) |
288 | return -EINVAL; |
289 | |
290 | name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); |
291 | if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') |
292 | return -EINVAL; /* name should be null-terminated */ |
293 | |
294 | dev = dev_get_by_name(genl_info_net(info), name); |
295 | if (!dev) |
296 | return -ENODEV; |
297 | |
298 | phy = ieee802154_mlme_ops(dev)->get_phy(dev); |
299 | BUG_ON(!phy); |
300 | |
301 | rc = -EINVAL; |
302 | /* phy name is optional, but should be checked if it's given */ |
303 | if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { |
304 | struct wpan_phy *phy2; |
305 | |
306 | const char *pname = |
307 | nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); |
308 | if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] |
309 | != '\0') |
310 | /* name should be null-terminated */ |
311 | goto out_dev; |
312 | |
313 | phy2 = wpan_phy_find(pname); |
314 | if (!phy2) |
315 | goto out_dev; |
316 | |
317 | if (phy != phy2) { |
318 | wpan_phy_put(phy2); |
319 | goto out_dev; |
320 | } |
321 | } |
322 | |
323 | rc = -ENOBUFS; |
324 | |
325 | msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); |
326 | if (!msg) |
327 | goto out_dev; |
328 | |
329 | if (!phy->del_iface) { |
330 | rc = -EINVAL; |
331 | goto nla_put_failure; |
332 | } |
333 | |
334 | rtnl_lock(); |
335 | phy->del_iface(phy, dev); |
336 | |
337 | /* We don't have device anymore */ |
338 | dev_put(dev); |
339 | dev = NULL; |
340 | |
341 | rtnl_unlock(); |
342 | |
343 | if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || |
344 | nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name)) |
345 | goto nla_put_failure; |
346 | wpan_phy_put(phy); |
347 | |
348 | return ieee802154_nl_reply(msg, info); |
349 | |
350 | nla_put_failure: |
351 | nlmsg_free(msg); |
352 | out_dev: |
353 | wpan_phy_put(phy); |
354 | if (dev) |
355 | dev_put(dev); |
356 | |
357 | return rc; |
358 | } |
359 | |
360 | static struct genl_ops ieee802154_phy_ops[] = { |
361 | IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy, |
362 | ieee802154_dump_phy), |
363 | IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface), |
364 | IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface), |
365 | }; |
366 | |
367 | /* |
368 | * No need to unregister as family unregistration will do it. |
369 | */ |
370 | int nl802154_phy_register(void) |
371 | { |
372 | int i; |
373 | int rc; |
374 | |
375 | for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) { |
376 | rc = genl_register_ops(&nl802154_family, |
377 | &ieee802154_phy_ops[i]); |
378 | if (rc) |
379 | return rc; |
380 | } |
381 | |
382 | return 0; |
383 | } |
384 |
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