1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Netlink interface for IEEE 802.15.4 stack
4 *
5 * Copyright 2007, 2008 Siemens AG
6 *
7 * Written by:
8 * Sergey Lapin <slapin@ossfans.org>
9 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
10 * Maxim Osipov <maxim.osipov@siemens.com>
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/if_arp.h>
16 #include <net/netlink.h>
17 #include <net/genetlink.h>
18 #include <net/cfg802154.h>
19 #include <net/af_ieee802154.h>
20 #include <net/ieee802154_netdev.h>
21 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */
22 #include <linux/nl802154.h>
23
24 #include "ieee802154.h"
25 #include "rdev-ops.h"
26 #include "core.h"
27
28 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid,
29 u32 seq, int flags, struct wpan_phy *phy)
30 {
31 void *hdr;
32 int i, pages = 0;
33 u32 *buf = kcalloc(IEEE802154_MAX_PAGE + 1, sizeof(u32), GFP_KERNEL);
34
35 pr_debug("%s\n", __func__);
36
37 if (!buf)
38 return -EMSGSIZE;
39
40 hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
41 IEEE802154_LIST_PHY);
42 if (!hdr)
43 goto out;
44
45 rtnl_lock();
46 if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
47 nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
48 nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
49 goto nla_put_failure;
50 for (i = 0; i <= IEEE802154_MAX_PAGE; i++) {
51 if (phy->supported.channels[i])
52 buf[pages++] = phy->supported.channels[i] | (i << 27);
53 }
54 if (pages &&
55 nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
56 pages * sizeof(uint32_t), buf))
57 goto nla_put_failure;
58 rtnl_unlock();
59 kfree(buf);
60 genlmsg_end(msg, hdr);
61 return 0;
62
63 nla_put_failure:
64 rtnl_unlock();
65 genlmsg_cancel(msg, hdr);
66 out:
67 kfree(buf);
68 return -EMSGSIZE;
69 }
70
71 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
72 {
73 /* Request for interface name, index, type, IEEE address,
74 * PAN Id, short address
75 */
76 struct sk_buff *msg;
77 struct wpan_phy *phy;
78 const char *name;
79 int rc = -ENOBUFS;
80
81 pr_debug("%s\n", __func__);
82
83 if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
84 return -EINVAL;
85
86 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
87 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
88 return -EINVAL; /* phy name should be null-terminated */
89
90 phy = wpan_phy_find(name);
91 if (!phy)
92 return -ENODEV;
93
94 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
95 if (!msg)
96 goto out_dev;
97
98 rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
99 0, phy);
100 if (rc < 0)
101 goto out_free;
102
103 wpan_phy_put(phy);
104
105 return genlmsg_reply(msg, info);
106 out_free:
107 nlmsg_free(msg);
108 out_dev:
109 wpan_phy_put(phy);
110 return rc;
111 }
112
113 struct dump_phy_data {
114 struct sk_buff *skb;
115 struct netlink_callback *cb;
116 int idx, s_idx;
117 };
118
119 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
120 {
121 int rc;
122 struct dump_phy_data *data = _data;
123
124 pr_debug("%s\n", __func__);
125
126 if (data->idx++ < data->s_idx)
127 return 0;
128
129 rc = ieee802154_nl_fill_phy(data->skb,
130 NETLINK_CB(data->cb->skb).portid,
131 data->cb->nlh->nlmsg_seq,
132 NLM_F_MULTI,
133 phy);
134
135 if (rc < 0) {
136 data->idx--;
137 return rc;
138 }
139
140 return 0;
141 }
142
143 int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb)
144 {
145 struct dump_phy_data data = {
146 .cb = cb,
147 .skb = skb,
148 .s_idx = cb->args[0],
149 .idx = 0,
150 };
151
152 pr_debug("%s\n", __func__);
153
154 wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
155
156 cb->args[0] = data.idx;
157
158 return skb->len;
159 }
160
161 int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
162 {
163 struct sk_buff *msg;
164 struct wpan_phy *phy;
165 const char *name;
166 const char *devname;
167 int rc = -ENOBUFS;
168 struct net_device *dev;
169 int type = __IEEE802154_DEV_INVALID;
170 unsigned char name_assign_type;
171
172 pr_debug("%s\n", __func__);
173
174 if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
175 return -EINVAL;
176
177 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
178 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
179 return -EINVAL; /* phy name should be null-terminated */
180
181 if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
182 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
183 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
184 != '\0')
185 return -EINVAL; /* phy name should be null-terminated */
186 name_assign_type = NET_NAME_USER;
187 } else {
188 devname = "wpan%d";
189 name_assign_type = NET_NAME_ENUM;
190 }
191
192 if (strlen(devname) >= IFNAMSIZ)
193 return -ENAMETOOLONG;
194
195 phy = wpan_phy_find(name);
196 if (!phy)
197 return -ENODEV;
198
199 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
200 if (!msg)
201 goto out_dev;
202
203 if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
204 nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
205 IEEE802154_ADDR_LEN) {
206 rc = -EINVAL;
207 goto nla_put_failure;
208 }
209
210 if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
211 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
212 if (type >= __IEEE802154_DEV_MAX) {
213 rc = -EINVAL;
214 goto nla_put_failure;
215 }
216 }
217
218 dev = rdev_add_virtual_intf_deprecated(wpan_phy_to_rdev(phy), devname,
219 name_assign_type, type);
220 if (IS_ERR(dev)) {
221 rc = PTR_ERR(dev);
222 goto nla_put_failure;
223 }
224 dev_hold(dev);
225
226 if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
227 struct sockaddr addr;
228
229 addr.sa_family = ARPHRD_IEEE802154;
230 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
231 IEEE802154_ADDR_LEN);
232
233 /* strangely enough, some callbacks (inetdev_event) from
234 * dev_set_mac_address require RTNL_LOCK
235 */
236 rtnl_lock();
237 rc = dev_set_mac_address(dev, &addr, NULL);
238 rtnl_unlock();
239 if (rc)
240 goto dev_unregister;
241 }
242
243 if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
244 nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name)) {
245 rc = -EMSGSIZE;
246 goto nla_put_failure;
247 }
248 dev_put(dev);
249
250 wpan_phy_put(phy);
251
252 return ieee802154_nl_reply(msg, info);
253
254 dev_unregister:
255 rtnl_lock(); /* del_iface must be called with RTNL lock */
256 rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
257 dev_put(dev);
258 rtnl_unlock();
259 nla_put_failure:
260 nlmsg_free(msg);
261 out_dev:
262 wpan_phy_put(phy);
263 return rc;
264 }
265
266 int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info)
267 {
268 struct sk_buff *msg;
269 struct wpan_phy *phy;
270 const char *name;
271 int rc;
272 struct net_device *dev;
273
274 pr_debug("%s\n", __func__);
275
276 if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
277 return -EINVAL;
278
279 name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
280 if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
281 return -EINVAL; /* name should be null-terminated */
282
283 rc = -ENODEV;
284 dev = dev_get_by_name(genl_info_net(info), name);
285 if (!dev)
286 return rc;
287 if (dev->type != ARPHRD_IEEE802154)
288 goto out;
289
290 phy = dev->ieee802154_ptr->wpan_phy;
291 BUG_ON(!phy);
292 get_device(&phy->dev);
293
294 rc = -EINVAL;
295 /* phy name is optional, but should be checked if it's given */
296 if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
297 struct wpan_phy *phy2;
298
299 const char *pname =
300 nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
301 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
302 != '\0')
303 /* name should be null-terminated */
304 goto out_dev;
305
306 phy2 = wpan_phy_find(pname);
307 if (!phy2)
308 goto out_dev;
309
310 if (phy != phy2) {
311 wpan_phy_put(phy2);
312 goto out_dev;
313 }
314 }
315
316 rc = -ENOBUFS;
317
318 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
319 if (!msg)
320 goto out_dev;
321
322 rtnl_lock();
323 rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
324
325 /* We don't have device anymore */
326 dev_put(dev);
327 dev = NULL;
328
329 rtnl_unlock();
330
331 if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
332 nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
333 goto nla_put_failure;
334 wpan_phy_put(phy);
335
336 return ieee802154_nl_reply(msg, info);
337
338 nla_put_failure:
339 nlmsg_free(msg);
340 out_dev:
341 wpan_phy_put(phy);
342 out:
343 dev_put(dev);
344
345 return rc;
346 }
347
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