GNU Linux-libre 4.14.266-gnu1
[releases.git] / net / ieee802154 / nl-phy.c
1 /*
2  * Netlink interface 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  * Written by:
16  * Sergey Lapin <slapin@ossfans.org>
17  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
18  * Maxim Osipov <maxim.osipov@siemens.com>
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/if_arp.h>
24 #include <net/netlink.h>
25 #include <net/genetlink.h>
26 #include <net/cfg802154.h>
27 #include <net/af_ieee802154.h>
28 #include <net/ieee802154_netdev.h>
29 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */
30 #include <linux/nl802154.h>
31
32 #include "ieee802154.h"
33 #include "rdev-ops.h"
34 #include "core.h"
35
36 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid,
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                 return -EMSGSIZE;
47
48         hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
49                           IEEE802154_LIST_PHY);
50         if (!hdr)
51                 goto out;
52
53         rtnl_lock();
54         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
55             nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) ||
56             nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel))
57                 goto nla_put_failure;
58         for (i = 0; i < 32; i++) {
59                 if (phy->supported.channels[i])
60                         buf[pages++] = phy->supported.channels[i] | (i << 27);
61         }
62         if (pages &&
63             nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
64                     pages * sizeof(uint32_t), buf))
65                 goto nla_put_failure;
66         rtnl_unlock();
67         kfree(buf);
68         genlmsg_end(msg, hdr);
69         return 0;
70
71 nla_put_failure:
72         rtnl_unlock();
73         genlmsg_cancel(msg, hdr);
74 out:
75         kfree(buf);
76         return -EMSGSIZE;
77 }
78
79 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
80 {
81         /* Request for interface name, index, type, IEEE address,
82          * PAN Id, short address
83          */
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         phy = wpan_phy_find(name);
99         if (!phy)
100                 return -ENODEV;
101
102         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
103         if (!msg)
104                 goto out_dev;
105
106         rc = ieee802154_nl_fill_phy(msg, info->snd_portid, 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 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).portid,
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 int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb)
152 {
153         struct dump_phy_data data = {
154                 .cb = cb,
155                 .skb = skb,
156                 .s_idx = cb->args[0],
157                 .idx = 0,
158         };
159
160         pr_debug("%s\n", __func__);
161
162         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
163
164         cb->args[0] = data.idx;
165
166         return skb->len;
167 }
168
169 int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
170 {
171         struct sk_buff *msg;
172         struct wpan_phy *phy;
173         const char *name;
174         const char *devname;
175         int rc = -ENOBUFS;
176         struct net_device *dev;
177         int type = __IEEE802154_DEV_INVALID;
178         unsigned char name_assign_type;
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                 name_assign_type = NET_NAME_USER;
195         } else  {
196                 devname = "wpan%d";
197                 name_assign_type = NET_NAME_ENUM;
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 (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
212             nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
213                         IEEE802154_ADDR_LEN) {
214                 rc = -EINVAL;
215                 goto nla_put_failure;
216         }
217
218         if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
219                 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
220                 if (type >= __IEEE802154_DEV_MAX) {
221                         rc = -EINVAL;
222                         goto nla_put_failure;
223                 }
224         }
225
226         dev = rdev_add_virtual_intf_deprecated(wpan_phy_to_rdev(phy), devname,
227                                                name_assign_type, type);
228         if (IS_ERR(dev)) {
229                 rc = PTR_ERR(dev);
230                 goto nla_put_failure;
231         }
232         dev_hold(dev);
233
234         if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
235                 struct sockaddr addr;
236
237                 addr.sa_family = ARPHRD_IEEE802154;
238                 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
239                            IEEE802154_ADDR_LEN);
240
241                 /* strangely enough, some callbacks (inetdev_event) from
242                  * dev_set_mac_address require RTNL_LOCK
243                  */
244                 rtnl_lock();
245                 rc = dev_set_mac_address(dev, &addr);
246                 rtnl_unlock();
247                 if (rc)
248                         goto dev_unregister;
249         }
250
251         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
252             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name)) {
253                 rc = -EMSGSIZE;
254                 goto nla_put_failure;
255         }
256         dev_put(dev);
257
258         wpan_phy_put(phy);
259
260         return ieee802154_nl_reply(msg, info);
261
262 dev_unregister:
263         rtnl_lock(); /* del_iface must be called with RTNL lock */
264         rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
265         dev_put(dev);
266         rtnl_unlock();
267 nla_put_failure:
268         nlmsg_free(msg);
269 out_dev:
270         wpan_phy_put(phy);
271         return rc;
272 }
273
274 int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info)
275 {
276         struct sk_buff *msg;
277         struct wpan_phy *phy;
278         const char *name;
279         int rc;
280         struct net_device *dev;
281
282         pr_debug("%s\n", __func__);
283
284         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
285                 return -EINVAL;
286
287         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
288         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
289                 return -EINVAL; /* name should be null-terminated */
290
291         rc = -ENODEV;
292         dev = dev_get_by_name(genl_info_net(info), name);
293         if (!dev)
294                 return rc;
295         if (dev->type != ARPHRD_IEEE802154)
296                 goto out;
297
298         phy = dev->ieee802154_ptr->wpan_phy;
299         BUG_ON(!phy);
300         get_device(&phy->dev);
301
302         rc = -EINVAL;
303         /* phy name is optional, but should be checked if it's given */
304         if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
305                 struct wpan_phy *phy2;
306
307                 const char *pname =
308                         nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
309                 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
310                                 != '\0')
311                         /* name should be null-terminated */
312                         goto out_dev;
313
314                 phy2 = wpan_phy_find(pname);
315                 if (!phy2)
316                         goto out_dev;
317
318                 if (phy != phy2) {
319                         wpan_phy_put(phy2);
320                         goto out_dev;
321                 }
322         }
323
324         rc = -ENOBUFS;
325
326         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
327         if (!msg)
328                 goto out_dev;
329
330         rtnl_lock();
331         rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev);
332
333         /* We don't have device anymore */
334         dev_put(dev);
335         dev = NULL;
336
337         rtnl_unlock();
338
339         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
340             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
341                 goto nla_put_failure;
342         wpan_phy_put(phy);
343
344         return ieee802154_nl_reply(msg, info);
345
346 nla_put_failure:
347         nlmsg_free(msg);
348 out_dev:
349         wpan_phy_put(phy);
350 out:
351         if (dev)
352                 dev_put(dev);
353
354         return rc;
355 }