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 pid, 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 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 57 58 NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page); 59 NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel); 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 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 static int ieee802154_list_phy(struct sk_buff *skb, 81 struct genl_info *info) 82 { 83 /* Request for interface name, index, type, IEEE address, 84 PAN Id, short address */ 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_GOODSIZE, GFP_KERNEL); 105 if (!msg) 106 goto out_dev; 107 108 rc = ieee802154_nl_fill_phy(msg, info->snd_pid, 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 } 123 124 struct dump_phy_data { 125 struct sk_buff *skb; 126 struct netlink_callback *cb; 127 int idx, s_idx; 128 }; 129 130 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data) 131 { 132 int rc; 133 struct dump_phy_data *data = _data; 134 135 pr_debug("%s\n", __func__); 136 137 if (data->idx++ < data->s_idx) 138 return 0; 139 140 rc = ieee802154_nl_fill_phy(data->skb, 141 NETLINK_CB(data->cb->skb).pid, 142 data->cb->nlh->nlmsg_seq, 143 NLM_F_MULTI, 144 phy); 145 146 if (rc < 0) { 147 data->idx--; 148 return rc; 149 } 150 151 return 0; 152 } 153 154 static int ieee802154_dump_phy(struct sk_buff *skb, 155 struct netlink_callback *cb) 156 { 157 struct dump_phy_data data = { 158 .cb = cb, 159 .skb = skb, 160 .s_idx = cb->args[0], 161 .idx = 0, 162 }; 163 164 pr_debug("%s\n", __func__); 165 166 wpan_phy_for_each(ieee802154_dump_phy_iter, &data); 167 168 cb->args[0] = data.idx; 169 170 return skb->len; 171 } 172 173 static int ieee802154_add_iface(struct sk_buff *skb, 174 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; 182 183 pr_debug("%s\n", __func__); 184 185 if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) 186 return -EINVAL; 187 188 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 189 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') 190 return -EINVAL; /* phy name should be null-terminated */ 191 192 if (info->attrs[IEEE802154_ATTR_DEV_NAME]) { 193 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 194 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] 195 != '\0') 196 return -EINVAL; /* phy name should be null-terminated */ 197 } else { 198 devname = "wpan%d"; 199 } 200 201 if (strlen(devname) >= IFNAMSIZ) 202 return -ENAMETOOLONG; 203 204 phy = wpan_phy_find(name); 205 if (!phy) 206 return -ENODEV; 207 208 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE); 209 if (!msg) 210 goto out_dev; 211 212 if (!phy->add_iface) { 213 rc = -EINVAL; 214 goto nla_put_failure; 215 } 216 217 if (info->attrs[IEEE802154_ATTR_HW_ADDR] && 218 nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) != 219 IEEE802154_ADDR_LEN) { 220 rc = -EINVAL; 221 goto nla_put_failure; 222 } 223 224 dev = phy->add_iface(phy, devname); 225 if (IS_ERR(dev)) { 226 rc = PTR_ERR(dev); 227 goto nla_put_failure; 228 } 229 230 if (info->attrs[IEEE802154_ATTR_HW_ADDR]) { 231 struct sockaddr addr; 232 233 addr.sa_family = ARPHRD_IEEE802154; 234 nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR], 235 IEEE802154_ADDR_LEN); 236 237 /* 238 * strangely enough, some callbacks (inetdev_event) from 239 * dev_set_mac_address require RTNL_LOCK 240 */ 241 rtnl_lock(); 242 rc = dev_set_mac_address(dev, &addr); 243 rtnl_unlock(); 244 if (rc) 245 goto dev_unregister; 246 } 247 248 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 249 NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name); 250 251 dev_put(dev); 252 253 wpan_phy_put(phy); 254 255 return ieee802154_nl_reply(msg, info); 256 257 dev_unregister: 258 rtnl_lock(); /* del_iface must be called with RTNL lock */ 259 phy->del_iface(phy, dev); 260 dev_put(dev); 261 rtnl_unlock(); 262 nla_put_failure: 263 nlmsg_free(msg); 264 out_dev: 265 wpan_phy_put(phy); 266 return rc; 267 } 268 269 static int ieee802154_del_iface(struct sk_buff *skb, 270 struct genl_info *info) 271 { 272 struct sk_buff *msg; 273 struct wpan_phy *phy; 274 const char *name; 275 int rc; 276 struct net_device *dev; 277 278 pr_debug("%s\n", __func__); 279 280 if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) 281 return -EINVAL; 282 283 name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 284 if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') 285 return -EINVAL; /* name should be null-terminated */ 286 287 dev = dev_get_by_name(genl_info_net(info), name); 288 if (!dev) 289 return -ENODEV; 290 291 phy = ieee802154_mlme_ops(dev)->get_phy(dev); 292 BUG_ON(!phy); 293 294 rc = -EINVAL; 295 /* phy name is optional, but should be checked if it's given */ 296 if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { 297 struct wpan_phy *phy2; 298 299 const char *pname = 300 nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 301 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] 302 != '\0') 303 /* name should be null-terminated */ 304 goto out_dev; 305 306 phy2 = wpan_phy_find(pname); 307 if (!phy2) 308 goto out_dev; 309 310 if (phy != phy2) { 311 wpan_phy_put(phy2); 312 goto out_dev; 313 } 314 } 315 316 rc = -ENOBUFS; 317 318 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); 319 if (!msg) 320 goto out_dev; 321 322 if (!phy->del_iface) { 323 rc = -EINVAL; 324 goto nla_put_failure; 325 } 326 327 rtnl_lock(); 328 phy->del_iface(phy, dev); 329 330 /* We don't have device anymore */ 331 dev_put(dev); 332 dev = NULL; 333 334 rtnl_unlock(); 335 336 337 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 338 NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name); 339 340 wpan_phy_put(phy); 341 342 return ieee802154_nl_reply(msg, info); 343 344 nla_put_failure: 345 nlmsg_free(msg); 346 out_dev: 347 wpan_phy_put(phy); 348 if (dev) 349 dev_put(dev); 350 351 return rc; 352 } 353 354 static struct genl_ops ieee802154_phy_ops[] = { 355 IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy, 356 ieee802154_dump_phy), 357 IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface), 358 IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface), 359 }; 360 361 /* 362 * No need to unregister as family unregistration will do it. 363 */ 364 int nl802154_phy_register(void) 365 { 366 int i; 367 int rc; 368 369 for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) { 370 rc = genl_register_ops(&nl802154_family, 371 &ieee802154_phy_ops[i]); 372 if (rc) 373 return rc; 374 } 375 376 return 0; 377 } 378