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             nla_put_s32(msg, IEEE802154_ATTR_CCA_ED_LEVEL, phy->cca_ed_level) ||
  63             nla_put_u8(msg, IEEE802154_ATTR_CSMA_RETRIES, phy->csma_retries) ||
  64             nla_put_u8(msg, IEEE802154_ATTR_CSMA_MIN_BE, phy->min_be) ||
  65             nla_put_u8(msg, IEEE802154_ATTR_CSMA_MAX_BE, phy->max_be) ||
  66             nla_put_s8(msg, IEEE802154_ATTR_FRAME_RETRIES, phy->frame_retries))
  67                 goto nla_put_failure;
  68         for (i = 0; i < 32; i++) {
  69                 if (phy->channels_supported[i])
  70                         buf[pages++] = phy->channels_supported[i] | (i << 27);
  71         }
  72         if (pages &&
  73             nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
  74                     pages * sizeof(uint32_t), buf))
  75                 goto nla_put_failure;
  76         mutex_unlock(&phy->pib_lock);
  77         kfree(buf);
  78         return genlmsg_end(msg, hdr);
  79
  80 nla_put_failure:
  81         mutex_unlock(&phy->pib_lock);
  82         genlmsg_cancel(msg, hdr);
  83 out:
  84         kfree(buf);
  85         return -EMSGSIZE;
  86 }
  87
  88 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info)
  89 {
  90         /* Request for interface name, index, type, IEEE address,
  91            PAN Id, short address */
  92         struct sk_buff *msg;
  93         struct wpan_phy *phy;
  94         const char *name;
  95         int rc = -ENOBUFS;
  96
  97         pr_debug("%s\n", __func__);
  98
  99         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 100                 return -EINVAL;
 101
 102         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 103         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 104                 return -EINVAL; /* phy name should be null-terminated */
 105
 106
 107         phy = wpan_phy_find(name);
 108         if (!phy)
 109                 return -ENODEV;
 110
 111         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 112         if (!msg)
 113                 goto out_dev;
 114
 115         rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq,
 116                         0, phy);
 117         if (rc < 0)
 118                 goto out_free;
 119
 120         wpan_phy_put(phy);
 121
 122         return genlmsg_reply(msg, info);
 123 out_free:
 124         nlmsg_free(msg);
 125 out_dev:
 126         wpan_phy_put(phy);
 127         return rc;
 128
 129 }
 130
 131 struct dump_phy_data {
 132         struct sk_buff *skb;
 133         struct netlink_callback *cb;
 134         int idx, s_idx;
 135 };
 136
 137 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
 138 {
 139         int rc;
 140         struct dump_phy_data *data = _data;
 141
 142         pr_debug("%s\n", __func__);
 143
 144         if (data->idx++ < data->s_idx)
 145                 return 0;
 146
 147         rc = ieee802154_nl_fill_phy(data->skb,
 148                         NETLINK_CB(data->cb->skb).portid,
 149                         data->cb->nlh->nlmsg_seq,
 150                         NLM_F_MULTI,
 151                         phy);
 152
 153         if (rc < 0) {
 154                 data->idx--;
 155                 return rc;
 156         }
 157
 158         return 0;
 159 }
 160
 161 int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb)
 162 {
 163         struct dump_phy_data data = {
 164                 .cb = cb,
 165                 .skb = skb,
 166                 .s_idx = cb->args[0],
 167                 .idx = 0,
 168         };
 169
 170         pr_debug("%s\n", __func__);
 171
 172         wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
 173
 174         cb->args[0] = data.idx;
 175
 176         return skb->len;
 177 }
 178
 179 int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info)
 180 {
 181         struct sk_buff *msg;
 182         struct wpan_phy *phy;
 183         const char *name;
 184         const char *devname;
 185         int rc = -ENOBUFS;
 186         struct net_device *dev;
 187         int type = __IEEE802154_DEV_INVALID;
 188
 189         pr_debug("%s\n", __func__);
 190
 191         if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
 192                 return -EINVAL;
 193
 194         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 195         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 196                 return -EINVAL; /* phy name should be null-terminated */
 197
 198         if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
 199                 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 200                 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
 201                                 != '\0')
 202                         return -EINVAL; /* phy name should be null-terminated */
 203         } else  {
 204                 devname = "wpan%d";
 205         }
 206
 207         if (strlen(devname) >= IFNAMSIZ)
 208                 return -ENAMETOOLONG;
 209
 210         phy = wpan_phy_find(name);
 211         if (!phy)
 212                 return -ENODEV;
 213
 214         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
 215         if (!msg)
 216                 goto out_dev;
 217
 218         if (!phy->add_iface) {
 219                 rc = -EINVAL;
 220                 goto nla_put_failure;
 221         }
 222
 223         if (info->attrs[IEEE802154_ATTR_HW_ADDR] &&
 224             nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) !=
 225                         IEEE802154_ADDR_LEN) {
 226                 rc = -EINVAL;
 227                 goto nla_put_failure;
 228         }
 229
 230         if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) {
 231                 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]);
 232                 if (type >= __IEEE802154_DEV_MAX) {
 233                         rc = -EINVAL;
 234                         goto nla_put_failure;
 235                 }
 236         }
 237
 238         dev = phy->add_iface(phy, devname, type);
 239         if (IS_ERR(dev)) {
 240                 rc = PTR_ERR(dev);
 241                 goto nla_put_failure;
 242         }
 243
 244         if (info->attrs[IEEE802154_ATTR_HW_ADDR]) {
 245                 struct sockaddr addr;
 246
 247                 addr.sa_family = ARPHRD_IEEE802154;
 248                 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR],
 249                                 IEEE802154_ADDR_LEN);
 250
 251                 /*
 252                  * strangely enough, some callbacks (inetdev_event) from
 253                  * dev_set_mac_address require RTNL_LOCK
 254                  */
 255                 rtnl_lock();
 256                 rc = dev_set_mac_address(dev, &addr);
 257                 rtnl_unlock();
 258                 if (rc)
 259                         goto dev_unregister;
 260         }
 261
 262         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 263             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name))
 264                 goto nla_put_failure;
 265         dev_put(dev);
 266
 267         wpan_phy_put(phy);
 268
 269         return ieee802154_nl_reply(msg, info);
 270
 271 dev_unregister:
 272         rtnl_lock(); /* del_iface must be called with RTNL lock */
 273         phy->del_iface(phy, dev);
 274         dev_put(dev);
 275         rtnl_unlock();
 276 nla_put_failure:
 277         nlmsg_free(msg);
 278 out_dev:
 279         wpan_phy_put(phy);
 280         return rc;
 281 }
 282
 283 int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info)
 284 {
 285         struct sk_buff *msg;
 286         struct wpan_phy *phy;
 287         const char *name;
 288         int rc;
 289         struct net_device *dev;
 290
 291         pr_debug("%s\n", __func__);
 292
 293         if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
 294                 return -EINVAL;
 295
 296         name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
 297         if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
 298                 return -EINVAL; /* name should be null-terminated */
 299
 300         dev = dev_get_by_name(genl_info_net(info), name);
 301         if (!dev)
 302                 return -ENODEV;
 303
 304         phy = ieee802154_mlme_ops(dev)->get_phy(dev);
 305         BUG_ON(!phy);
 306
 307         rc = -EINVAL;
 308         /* phy name is optional, but should be checked if it's given */
 309         if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
 310                 struct wpan_phy *phy2;
 311
 312                 const char *pname =
 313                         nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 314                 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
 315                                 != '\0')
 316                         /* name should be null-terminated */
 317                         goto out_dev;
 318
 319                 phy2 = wpan_phy_find(pname);
 320                 if (!phy2)
 321                         goto out_dev;
 322
 323                 if (phy != phy2) {
 324                         wpan_phy_put(phy2);
 325                         goto out_dev;
 326                 }
 327         }
 328
 329         rc = -ENOBUFS;
 330
 331         msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
 332         if (!msg)
 333                 goto out_dev;
 334
 335         if (!phy->del_iface) {
 336                 rc = -EINVAL;
 337                 goto nla_put_failure;
 338         }
 339
 340         rtnl_lock();
 341         phy->del_iface(phy, dev);
 342
 343         /* We don't have device anymore */
 344         dev_put(dev);
 345         dev = NULL;
 346
 347         rtnl_unlock();
 348
 349         if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
 350             nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name))
 351                 goto nla_put_failure;
 352         wpan_phy_put(phy);
 353
 354         return ieee802154_nl_reply(msg, info);
 355
 356 nla_put_failure:
 357         nlmsg_free(msg);
 358 out_dev:
 359         wpan_phy_put(phy);
 360         if (dev)
 361                 dev_put(dev);
 362
 363         return rc;
 364 }
 365
 366 static int phy_set_txpower(struct wpan_phy *phy, struct genl_info *info)
 367 {
 368         int txpower = nla_get_s8(info->attrs[IEEE802154_ATTR_TXPOWER]);
 369         int rc;
 370
 371         rc = phy->set_txpower(phy, txpower);
 372         if (rc < 0)
 373                 return rc;
 374
 375         phy->transmit_power = txpower;
 376
 377         return 0;
 378 }
 379
 380 static int phy_set_lbt(struct wpan_phy *phy, struct genl_info *info)
 381 {
 382         u8 on = !!nla_get_u8(info->attrs[IEEE802154_ATTR_LBT_ENABLED]);
 383         int rc;
 384
 385         rc = phy->set_lbt(phy, on);
 386         if (rc < 0)
 387                 return rc;
 388
 389         phy->lbt = on;
 390
 391         return 0;
 392 }
 393
 394 static int phy_set_cca_mode(struct wpan_phy *phy, struct genl_info *info)
 395 {
 396         u8 mode = nla_get_u8(info->attrs[IEEE802154_ATTR_CCA_MODE]);
 397         int rc;
 398
 399         if (mode > 3)
 400                 return -EINVAL;
 401
 402         rc = phy->set_cca_mode(phy, mode);
 403         if (rc < 0)
 404                 return rc;
 405
 406         phy->cca_mode = mode;
 407
 408         return 0;
 409 }
 410
 411 static int phy_set_cca_ed_level(struct wpan_phy *phy, struct genl_info *info)
 412 {
 413         s32 level = nla_get_s32(info->attrs[IEEE802154_ATTR_CCA_ED_LEVEL]);
 414         int rc;
 415
 416         rc = phy->set_cca_ed_level(phy, level);
 417         if (rc < 0)
 418                 return rc;
 419
 420         phy->cca_ed_level = level;
 421
 422         return 0;
 423 }
 424
 425 static int phy_set_csma_params(struct wpan_phy *phy, struct genl_info *info)
 426 {
 427         int rc;
 428         u8 min_be = phy->min_be;
 429         u8 max_be = phy->max_be;
 430         u8 retries = phy->csma_retries;
 431
 432         if (info->attrs[IEEE802154_ATTR_CSMA_RETRIES])
 433                 retries = nla_get_u8(info->attrs[IEEE802154_ATTR_CSMA_RETRIES]);
 434         if (info->attrs[IEEE802154_ATTR_CSMA_MIN_BE])
 435                 min_be = nla_get_u8(info->attrs[IEEE802154_ATTR_CSMA_MIN_BE]);
 436         if (info->attrs[IEEE802154_ATTR_CSMA_MAX_BE])
 437                 max_be = nla_get_u8(info->attrs[IEEE802154_ATTR_CSMA_MAX_BE]);
 438
 439         if (retries > 5 || max_be < 3 || max_be > 8 || min_be > max_be)
 440                 return -EINVAL;
 441
 442         rc = phy->set_csma_params(phy, min_be, max_be, retries);
 443         if (rc < 0)
 444                 return rc;
 445
 446         phy->min_be = min_be;
 447         phy->max_be = max_be;
 448         phy->csma_retries = retries;
 449
 450         return 0;
 451 }
 452
 453 static int phy_set_frame_retries(struct wpan_phy *phy, struct genl_info *info)
 454 {
 455         s8 retries = nla_get_s8(info->attrs[IEEE802154_ATTR_FRAME_RETRIES]);
 456         int rc;
 457
 458         if (retries < -1 || retries > 7)
 459                 return -EINVAL;
 460
 461         rc = phy->set_frame_retries(phy, retries);
 462         if (rc < 0)
 463                 return rc;
 464
 465         phy->frame_retries = retries;
 466
 467         return 0;
 468 }
 469
 470 int ieee802154_set_phyparams(struct sk_buff *skb, struct genl_info *info)
 471 {
 472         struct wpan_phy *phy;
 473         const char *name;
 474         int rc = -ENOTSUPP;
 475
 476         pr_debug("%s\n", __func__);
 477
 478         if (!info->attrs[IEEE802154_ATTR_PHY_NAME] &&
 479             !info->attrs[IEEE802154_ATTR_LBT_ENABLED] &&
 480             !info->attrs[IEEE802154_ATTR_CCA_MODE] &&
 481             !info->attrs[IEEE802154_ATTR_CCA_ED_LEVEL] &&
 482             !info->attrs[IEEE802154_ATTR_CSMA_RETRIES] &&
 483             !info->attrs[IEEE802154_ATTR_CSMA_MIN_BE] &&
 484             !info->attrs[IEEE802154_ATTR_CSMA_MAX_BE] &&
 485             !info->attrs[IEEE802154_ATTR_FRAME_RETRIES])
 486                 return -EINVAL;
 487
 488         name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
 489         if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
 490                 return -EINVAL; /* phy name should be null-terminated */
 491
 492         phy = wpan_phy_find(name);
 493         if (!phy)
 494                 return -ENODEV;
 495
 496         if ((!phy->set_txpower && info->attrs[IEEE802154_ATTR_TXPOWER]) ||
 497             (!phy->set_lbt && info->attrs[IEEE802154_ATTR_LBT_ENABLED]) ||
 498             (!phy->set_cca_mode && info->attrs[IEEE802154_ATTR_CCA_MODE]) ||
 499             (!phy->set_cca_ed_level &&
 500              info->attrs[IEEE802154_ATTR_CCA_ED_LEVEL]))
 501                 goto out;
 502
 503         mutex_lock(&phy->pib_lock);
 504
 505         if (info->attrs[IEEE802154_ATTR_TXPOWER]) {
 506                 rc = phy_set_txpower(phy, info);
 507                 if (rc < 0)
 508                         goto error;
 509         }
 510
 511         if (info->attrs[IEEE802154_ATTR_LBT_ENABLED]) {
 512                 rc = phy_set_lbt(phy, info);
 513                 if (rc < 0)
 514                         goto error;
 515         }
 516
 517         if (info->attrs[IEEE802154_ATTR_CCA_MODE]) {
 518                 rc = phy_set_cca_mode(phy, info);
 519                 if (rc < 0)
 520                         goto error;
 521         }
 522
 523         if (info->attrs[IEEE802154_ATTR_CCA_ED_LEVEL]) {
 524                 rc = phy_set_cca_ed_level(phy, info);
 525                 if (rc < 0)
 526                         goto error;
 527         }
 528
 529         if (info->attrs[IEEE802154_ATTR_CSMA_RETRIES] ||
 530             info->attrs[IEEE802154_ATTR_CSMA_MIN_BE] ||
 531             info->attrs[IEEE802154_ATTR_CSMA_MAX_BE]) {
 532                 rc = phy_set_csma_params(phy, info);
 533                 if (rc < 0)
 534                         goto error;
 535         }
 536
 537         if (info->attrs[IEEE802154_ATTR_FRAME_RETRIES]) {
 538                 rc = phy_set_frame_retries(phy, info);
 539                 if (rc < 0)
 540                         goto error;
 541         }
 542
 543         mutex_unlock(&phy->pib_lock);
 544
 545         wpan_phy_put(phy);
 546
 547         return 0;
 548
 549 error:
 550         mutex_unlock(&phy->pib_lock);
 551 out:
 552         wpan_phy_put(phy);
 553         return rc;
 554 }