net/ieee802154/nl-phy.c

   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 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
  81 {
  82         /* Request for interface name, index, type, IEEE address,
  83          * PAN Id, short address
  84          */
  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 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).portid,
 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 int ieee802154_dump_phy(struct sk_buff *skb, 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
 171 int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
 172 {
 173         struct sk_buff *msg;
 174         struct wpan_phy *phy;
 175         const char *name;
 176         const char *devname;
 177         int rc = -ENOBUFS;
 178         struct net_device *dev;
 179         int type = __IEEE802154_DEV_INVALID;
 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         if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
 216             nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
 217                         IEEE802154_ADDR_LEN) {
 218                 rc = -EINVAL;
 219                 goto nla_put_failure;
 220         }
 221
 222         if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
 223                 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
 224                 if (type >= __IEEE802154_DEV_MAX) {
 225                         rc = -EINVAL;
 226                         goto nla_put_failure;
 227                 }
 228         }
 229
 230         dev = phy->add_iface(phy, devname, type);
 231         if (IS_ERR(dev)) {
 232                 rc = PTR_ERR(dev);
 233                 goto nla_put_failure;
 234         }
 235
 236         if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
 237                 struct sockaddr addr;
 238
 239                 addr.sa_family = ARPHRD_IEEE802154;
 240                 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
 241                            IEEE802154_ADDR_LEN);
 242
 243                 /* strangely enough, some callbacks (inetdev_event) from
 244                  * dev_set_mac_address require RTNL_LOCK
 245                  */
 246                 rtnl_lock();
 247                 rc = dev_set_mac_address(dev, &addr);
 248                 rtnl_unlock();
 249                 if (rc)
 250                         goto dev_unregister;
 251         }
 252
 253         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 254             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
 255                 goto nla_put_failure;
 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         phy->del_iface(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         dev = dev_get_by_name(genl_info_net(info), name);
 292         if (!dev)
 293                 return -ENODEV;
 294
 295         phy = ieee802154_mlme_ops(dev)->get_phy(dev);
 296         BUG_ON(!phy);
 297
 298         rc = -EINVAL;
 299         /* phy name is optional, but should be checked if it's given */
 300         if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
 301                 struct wpan_phy *phy2;
 302
 303                 const char *pname =
 304                         nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 305                 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
 306                                 != '\0')
 307                         /* name should be null-terminated */
 308                         goto out_dev;
 309
 310                 phy2 = wpan_phy_find(pname);
 311                 if (!phy2)
 312                         goto out_dev;
 313
 314                 if (phy != phy2) {
 315                         wpan_phy_put(phy2);
 316                         goto out_dev;
 317                 }
 318         }
 319
 320         rc = -ENOBUFS;
 321
 322         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
 323         if (!msg)
 324                 goto out_dev;
 325
 326         if (!phy->del_iface) {
 327                 rc = -EINVAL;
 328                 goto nla_put_failure;
 329         }
 330
 331         rtnl_lock();
 332         phy->del_iface(phy, dev);
 333
 334         /* We don't have device anymore */
 335         dev_put(dev);
 336         dev = NULL;
 337
 338         rtnl_unlock();
 339
 340         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 341             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
 342                 goto nla_put_failure;
 343         wpan_phy_put(phy);
 344
 345         return ieee802154_nl_reply(msg, info);
 346
 347 nla_put_failure:
 348         nlmsg_free(msg);
 349 out_dev:
 350         wpan_phy_put(phy);
 351         if (dev)
 352                 dev_put(dev);
 353
 354         return rc;
 355 }