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 struct sk_buff *msg; 85 struct wpan_phy *phy; 86 const char *name; 87 int rc = -ENOBUFS; 88 89 pr_debug("%s\n", __func__); 90 91 if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) 92 return -EINVAL; 93 94 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 95 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') 96 return -EINVAL; /* phy name should be null-terminated */ 97 98 99 phy = wpan_phy_find(name); 100 if (!phy) 101 return -ENODEV; 102 103 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 104 if (!msg) 105 goto out_dev; 106 107 rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq, 108 0, phy); 109 if (rc < 0) 110 goto out_free; 111 112 wpan_phy_put(phy); 113 114 return genlmsg_reply(msg, info); 115 out_free: 116 nlmsg_free(msg); 117 out_dev: 118 wpan_phy_put(phy); 119 return rc; 120 121 } 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 /* 244 * strangely enough, some callbacks (inetdev_event) from 245 * dev_set_mac_address require RTNL_LOCK 246 */ 247 rtnl_lock(); 248 rc = dev_set_mac_address(dev, &addr); 249 rtnl_unlock(); 250 if (rc) 251 goto dev_unregister; 252 } 253 254 if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || 255 nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name)) 256 goto nla_put_failure; 257 dev_put(dev); 258 259 wpan_phy_put(phy); 260 261 return ieee802154_nl_reply(msg, info); 262 263 dev_unregister: 264 rtnl_lock(); /* del_iface must be called with RTNL lock */ 265 phy->del_iface(phy, dev); 266 dev_put(dev); 267 rtnl_unlock(); 268 nla_put_failure: 269 nlmsg_free(msg); 270 out_dev: 271 wpan_phy_put(phy); 272 return rc; 273 } 274 275 int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info) 276 { 277 struct sk_buff *msg; 278 struct wpan_phy *phy; 279 const char *name; 280 int rc; 281 struct net_device *dev; 282 283 pr_debug("%s\n", __func__); 284 285 if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) 286 return -EINVAL; 287 288 name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 289 if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') 290 return -EINVAL; /* name should be null-terminated */ 291 292 dev = dev_get_by_name(genl_info_net(info), name); 293 if (!dev) 294 return -ENODEV; 295 296 phy = ieee802154_mlme_ops(dev)->get_phy(dev); 297 BUG_ON(!phy); 298 299 rc = -EINVAL; 300 /* phy name is optional, but should be checked if it's given */ 301 if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { 302 struct wpan_phy *phy2; 303 304 const char *pname = 305 nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 306 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] 307 != '\0') 308 /* name should be null-terminated */ 309 goto out_dev; 310 311 phy2 = wpan_phy_find(pname); 312 if (!phy2) 313 goto out_dev; 314 315 if (phy != phy2) { 316 wpan_phy_put(phy2); 317 goto out_dev; 318 } 319 } 320 321 rc = -ENOBUFS; 322 323 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); 324 if (!msg) 325 goto out_dev; 326 327 if (!phy->del_iface) { 328 rc = -EINVAL; 329 goto nla_put_failure; 330 } 331 332 rtnl_lock(); 333 phy->del_iface(phy, dev); 334 335 /* We don't have device anymore */ 336 dev_put(dev); 337 dev = NULL; 338 339 rtnl_unlock(); 340 341 if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || 342 nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name)) 343 goto nla_put_failure; 344 wpan_phy_put(phy); 345 346 return ieee802154_nl_reply(msg, info); 347 348 nla_put_failure: 349 nlmsg_free(msg); 350 out_dev: 351 wpan_phy_put(phy); 352 if (dev) 353 dev_put(dev); 354 355 return rc; 356 } 357