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