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             nla_put_s8(msg, IEEE802154_ATTR_TXPOWER, phy->transmit_power) ||
  60             nla_put_u8(msg, IEEE802154_ATTR_LBT_ENABLED, phy->lbt) ||
  61             nla_put_u8(msg, IEEE802154_ATTR_CCA_MODE, phy->cca_mode))
  62                 goto nla_put_failure;
  63         for (i = 0; i < 32; i++) {
  64                 if (phy->channels_supported[i])
  65                         buf[pages++] = phy->channels_supported[i] | (i << 27);
  66         }
  67         if (pages &&
  68             nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
  69                     pages * sizeof(uint32_t), buf))
  70                 goto nla_put_failure;
  71         mutex_unlock(&phy->pib_lock);
  72         kfree(buf);
  73         return genlmsg_end(msg, hdr);
  74
  75 nla_put_failure:
  76         mutex_unlock(&phy->pib_lock);
  77         genlmsg_cancel(msg, hdr);
  78 out:
  79         kfree(buf);
  80         return -EMSGSIZE;
  81 }
  82
  83 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
  84 {
  85         /* Request for interface name, index, type, IEEE address,
  86            PAN Id, short address */
  87         struct sk_buff *msg;
  88         struct wpan_phy *phy;
  89         const char *name;
  90         int rc = -ENOBUFS;
  91
  92         pr_debug("%s\n", __func__);
  93
  94         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
  95                 return -EINVAL;
  96
  97         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
  98         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
  99                 return -EINVAL; /* phy name should be null-terminated */
 100
 101
 102         phy = wpan_phy_find(name);
 103         if (!phy)
 104                 return -ENODEV;
 105
 106         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 107         if (!msg)
 108                 goto out_dev;
 109
 110         rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
 111                         0, phy);
 112         if (rc < 0)
 113                 goto out_free;
 114
 115         wpan_phy_put(phy);
 116
 117         return genlmsg_reply(msg, info);
 118 out_free:
 119         nlmsg_free(msg);
 120 out_dev:
 121         wpan_phy_put(phy);
 122         return rc;
 123
 124 }
 125
 126 struct dump_phy_data {
 127         struct sk_buff *skb;
 128         struct netlink_callback *cb;
 129         int idx, s_idx;
 130 };
 131
 132 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
 133 {
 134         int rc;
 135         struct dump_phy_data *data = _data;
 136
 137         pr_debug("%s\n", __func__);
 138
 139         if (data->idx++ < data->s_idx)
 140                 return 0;
 141
 142         rc = ieee802154_nl_fill_phy(data->skb,
 143                         NETLINK_CB(data->cb->skb).portid,
 144                         data->cb->nlh->nlmsg_seq,
 145                         NLM_F_MULTI,
 146                         phy);
 147
 148         if (rc < 0) {
 149                 data->idx--;
 150                 return rc;
 151         }
 152
 153         return 0;
 154 }
 155
 156 int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb)
 157 {
 158         struct dump_phy_data data = {
 159                 .cb = cb,
 160                 .skb = skb,
 161                 .s_idx = cb->args[0],
 162                 .idx = 0,
 163         };
 164
 165         pr_debug("%s\n", __func__);
 166
 167         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
 168
 169         cb->args[0] = data.idx;
 170
 171         return skb->len;
 172 }
 173
 174 int ieee802154_add_iface(struct sk_buff *skb, 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                         rc = -EINVAL;
 229                         goto nla_put_failure;
 230                 }
 231         }
 232
 233         dev = phy->add_iface(phy, devname, type);
 234         if (IS_ERR(dev)) {
 235                 rc = PTR_ERR(dev);
 236                 goto nla_put_failure;
 237         }
 238
 239         if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
 240                 struct sockaddr addr;
 241
 242                 addr.sa_family = ARPHRD_IEEE802154;
 243                 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
 244                                 IEEE802154_ADDR_LEN);
 245
 246                 /*
 247                  * strangely enough, some callbacks (inetdev_event) from
 248                  * dev_set_mac_address require RTNL_LOCK
 249                  */
 250                 rtnl_lock();
 251                 rc = dev_set_mac_address(dev, &addr);
 252                 rtnl_unlock();
 253                 if (rc)
 254                         goto dev_unregister;
 255         }
 256
 257         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 258             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
 259                 goto nla_put_failure;
 260         dev_put(dev);
 261
 262         wpan_phy_put(phy);
 263
 264         return ieee802154_nl_reply(msg, info);
 265
 266 dev_unregister:
 267         rtnl_lock(); /* del_iface must be called with RTNL lock */
 268         phy->del_iface(phy, dev);
 269         dev_put(dev);
 270         rtnl_unlock();
 271 nla_put_failure:
 272         nlmsg_free(msg);
 273 out_dev:
 274         wpan_phy_put(phy);
 275         return rc;
 276 }
 277
 278 int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info)
 279 {
 280         struct sk_buff *msg;
 281         struct wpan_phy *phy;
 282         const char *name;
 283         int rc;
 284         struct net_device *dev;
 285
 286         pr_debug("%s\n", __func__);
 287
 288         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
 289                 return -EINVAL;
 290
 291         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 292         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
 293                 return -EINVAL; /* name should be null-terminated */
 294
 295         dev = dev_get_by_name(genl_info_net(info), name);
 296         if (!dev)
 297                 return -ENODEV;
 298
 299         phy = ieee802154_mlme_ops(dev)->get_phy(dev);
 300         BUG_ON(!phy);
 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         if (!phy->del_iface) {
 331                 rc = -EINVAL;
 332                 goto nla_put_failure;
 333         }
 334
 335         rtnl_lock();
 336         phy->del_iface(phy, dev);
 337
 338         /* We don't have device anymore */
 339         dev_put(dev);
 340         dev = NULL;
 341
 342         rtnl_unlock();
 343
 344         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 345             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
 346                 goto nla_put_failure;
 347         wpan_phy_put(phy);
 348
 349         return ieee802154_nl_reply(msg, info);
 350
 351 nla_put_failure:
 352         nlmsg_free(msg);
 353 out_dev:
 354         wpan_phy_put(phy);
 355         if (dev)
 356                 dev_put(dev);
 357
 358         return rc;
 359 }
 360
 361 static int phy_set_txpower(struct wpan_phy *phy, struct genl_info *info)
 362 {
 363         int txpower = nla_get_s8(info->attrs[IEEE802154_ATTR_TXPOWER]);
 364         int rc;
 365
 366         rc = phy->set_txpower(phy, txpower);
 367         if (rc < 0)
 368                 return rc;
 369
 370         phy->transmit_power = txpower;
 371
 372         return 0;
 373 }
 374
 375 static int phy_set_lbt(struct wpan_phy *phy, struct genl_info *info)
 376 {
 377         u8 on = !!nla_get_u8(info->attrs[IEEE802154_ATTR_LBT_ENABLED]);
 378         int rc;
 379
 380         rc = phy->set_lbt(phy, on);
 381         if (rc < 0)
 382                 return rc;
 383
 384         phy->lbt = on;
 385
 386         return 0;
 387 }
 388
 389 static int phy_set_cca_mode(struct wpan_phy *phy, struct genl_info *info)
 390 {
 391         u8 mode = nla_get_u8(info->attrs[IEEE802154_ATTR_CCA_MODE]);
 392         int rc;
 393
 394         if (mode > 3)
 395                 return -EINVAL;
 396
 397         rc = phy->set_cca_mode(phy, mode);
 398         if (rc < 0)
 399                 return rc;
 400
 401         phy->cca_mode = mode;
 402
 403         return 0;
 404 }
 405
 406 int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info)
 407 {
 408         struct wpan_phy *phy;
 409         const char *name;
 410         int rc = -ENOTSUPP;
 411
 412         pr_debug("%s\n", __func__);
 413
 414         if (!info->attrs[IEEE802154_ATTR_PHY_NAME] &&
 415             !info->attrs[IEEE802154_ATTR_LBT_ENABLED] &&
 416             !info->attrs[IEEE802154_ATTR_CCA_MODE])
 417                 return -EINVAL;
 418
 419         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 420         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 421                 return -EINVAL; /* phy name should be null-terminated */
 422
 423         phy = wpan_phy_find(name);
 424         if (!phy)
 425                 return -ENODEV;
 426
 427         if ((!phy->set_txpower && info->attrs[IEEE802154_ATTR_TXPOWER]) ||
 428             (!phy->set_lbt && info->attrs[IEEE802154_ATTR_LBT_ENABLED]) ||
 429             (!phy->set_cca_mode && info->attrs[IEEE802154_ATTR_CCA_MODE]))
 430                 goto out;
 431
 432         mutex_lock(&phy->pib_lock);
 433
 434         if (info->attrs[IEEE802154_ATTR_TXPOWER]) {
 435                 rc = phy_set_txpower(phy, info);
 436                 if (rc < 0)
 437                         goto error;
 438         }
 439
 440         if (info->attrs[IEEE802154_ATTR_LBT_ENABLED]) {
 441                 rc = phy_set_lbt(phy, info);
 442                 if (rc < 0)
 443                         goto error;
 444         }
 445
 446         if (info->attrs[IEEE802154_ATTR_CCA_MODE]) {
 447                 rc = phy_set_cca_mode(phy, info);
 448                 if (rc < 0)
 449                         goto error;
 450         }
 451
 452         mutex_unlock(&phy->pib_lock);
 453
 454         wpan_phy_put(phy);
 455
 456         return 0;
 457
 458 error:
 459         mutex_unlock(&phy->pib_lock);
 460 out:
 461         wpan_phy_put(phy);
 462         return rc;
 463 }