1 /* 2 * Netlink interface 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 * Written by: 16 * Sergey Lapin <slapin@ossfans.org> 17 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> 18 * Maxim Osipov <maxim.osipov@siemens.com> 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/slab.h> 23 #include <linux/if_arp.h> 24 #include <net/netlink.h> 25 #include <net/genetlink.h> 26 #include <net/cfg802154.h> 27 #include <net/af_ieee802154.h> 28 #include <net/ieee802154_netdev.h> 29 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */ 30 #include <linux/nl802154.h> 31 32 #include "ieee802154.h" 33 #include "rdev-ops.h" 34 #include "core.h" 35 36 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 portid, 37 u32 seq, int flags, struct wpan_phy *phy) 38 { 39 void *hdr; 40 int i, pages = 0; 41 uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL); 42 43 pr_debug("%s\n", __func__); 44 45 if (!buf) 46 return -EMSGSIZE; 47 48 hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags, 49 IEEE802154_LIST_PHY); 50 if (!hdr) 51 goto out; 52 53 mutex_lock(&phy->pib_lock); 54 if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || 55 nla_put_u8(msg, IEEE802154_ATTR_PAGE, phy->current_page) || 56 nla_put_u8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel)) 57 goto nla_put_failure; 58 for (i = 0; i < 32; i++) { 59 if (phy->channels_supported[i]) 60 buf[pages++] = phy->channels_supported[i] | (i << 27); 61 } 62 if (pages && 63 nla_put(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST, 64 pages * sizeof(uint32_t), buf)) 65 goto nla_put_failure; 66 mutex_unlock(&phy->pib_lock); 67 kfree(buf); 68 return genlmsg_end(msg, hdr); 69 70 nla_put_failure: 71 mutex_unlock(&phy->pib_lock); 72 genlmsg_cancel(msg, hdr); 73 out: 74 kfree(buf); 75 return -EMSGSIZE; 76 } 77 78 int ieee802154_list_phy(struct sk_buff *skb, struct genl_info *info) 79 { 80 /* Request for interface name, index, type, IEEE address, 81 * PAN Id, short address 82 */ 83 struct sk_buff *msg; 84 struct wpan_phy *phy; 85 const char *name; 86 int rc = -ENOBUFS; 87 88 pr_debug("%s\n", __func__); 89 90 if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) 91 return -EINVAL; 92 93 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 94 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') 95 return -EINVAL; /* phy name should be null-terminated */ 96 97 phy = wpan_phy_find(name); 98 if (!phy) 99 return -ENODEV; 100 101 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 102 if (!msg) 103 goto out_dev; 104 105 rc = ieee802154_nl_fill_phy(msg, info->snd_portid, info->snd_seq, 106 0, phy); 107 if (rc < 0) 108 goto out_free; 109 110 wpan_phy_put(phy); 111 112 return genlmsg_reply(msg, info); 113 out_free: 114 nlmsg_free(msg); 115 out_dev: 116 wpan_phy_put(phy); 117 return rc; 118 } 119 120 struct dump_phy_data { 121 struct sk_buff *skb; 122 struct netlink_callback *cb; 123 int idx, s_idx; 124 }; 125 126 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data) 127 { 128 int rc; 129 struct dump_phy_data *data = _data; 130 131 pr_debug("%s\n", __func__); 132 133 if (data->idx++ < data->s_idx) 134 return 0; 135 136 rc = ieee802154_nl_fill_phy(data->skb, 137 NETLINK_CB(data->cb->skb).portid, 138 data->cb->nlh->nlmsg_seq, 139 NLM_F_MULTI, 140 phy); 141 142 if (rc < 0) { 143 data->idx--; 144 return rc; 145 } 146 147 return 0; 148 } 149 150 int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb) 151 { 152 struct dump_phy_data data = { 153 .cb = cb, 154 .skb = skb, 155 .s_idx = cb->args[0], 156 .idx = 0, 157 }; 158 159 pr_debug("%s\n", __func__); 160 161 wpan_phy_for_each(ieee802154_dump_phy_iter, &data); 162 163 cb->args[0] = data.idx; 164 165 return skb->len; 166 } 167 168 int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info) 169 { 170 struct sk_buff *msg; 171 struct wpan_phy *phy; 172 const char *name; 173 const char *devname; 174 int rc = -ENOBUFS; 175 struct net_device *dev; 176 int type = __IEEE802154_DEV_INVALID; 177 178 pr_debug("%s\n", __func__); 179 180 if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) 181 return -EINVAL; 182 183 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 184 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') 185 return -EINVAL; /* phy name should be null-terminated */ 186 187 if (info->attrs[IEEE802154_ATTR_DEV_NAME]) { 188 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 189 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] 190 != '\0') 191 return -EINVAL; /* phy name should be null-terminated */ 192 } else { 193 devname = "wpan%d"; 194 } 195 196 if (strlen(devname) >= IFNAMSIZ) 197 return -ENAMETOOLONG; 198 199 phy = wpan_phy_find(name); 200 if (!phy) 201 return -ENODEV; 202 203 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE); 204 if (!msg) 205 goto out_dev; 206 207 if (info->attrs[IEEE802154_ATTR_HW_ADDR] && 208 nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) != 209 IEEE802154_ADDR_LEN) { 210 rc = -EINVAL; 211 goto nla_put_failure; 212 } 213 214 if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) { 215 type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]); 216 if (type >= __IEEE802154_DEV_MAX) { 217 rc = -EINVAL; 218 goto nla_put_failure; 219 } 220 } 221 222 dev = rdev_add_virtual_intf_deprecated(wpan_phy_to_rdev(phy), devname, 223 type); 224 if (IS_ERR(dev)) { 225 rc = PTR_ERR(dev); 226 goto nla_put_failure; 227 } 228 dev_hold(dev); 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 /* strangely enough, some callbacks (inetdev_event) from 238 * dev_set_mac_address require RTNL_LOCK 239 */ 240 rtnl_lock(); 241 rc = dev_set_mac_address(dev, &addr); 242 rtnl_unlock(); 243 if (rc) 244 goto dev_unregister; 245 } 246 247 if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || 248 nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name)) 249 goto nla_put_failure; 250 dev_put(dev); 251 252 wpan_phy_put(phy); 253 254 return ieee802154_nl_reply(msg, info); 255 256 dev_unregister: 257 rtnl_lock(); /* del_iface must be called with RTNL lock */ 258 rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev); 259 dev_put(dev); 260 rtnl_unlock(); 261 nla_put_failure: 262 nlmsg_free(msg); 263 out_dev: 264 wpan_phy_put(phy); 265 return rc; 266 } 267 268 int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info) 269 { 270 struct sk_buff *msg; 271 struct wpan_phy *phy; 272 const char *name; 273 int rc; 274 struct net_device *dev; 275 276 pr_debug("%s\n", __func__); 277 278 if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) 279 return -EINVAL; 280 281 name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 282 if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') 283 return -EINVAL; /* name should be null-terminated */ 284 285 dev = dev_get_by_name(genl_info_net(info), name); 286 if (!dev) 287 return -ENODEV; 288 289 phy = dev->ieee802154_ptr->wpan_phy; 290 BUG_ON(!phy); 291 get_device(&phy->dev); 292 293 rc = -EINVAL; 294 /* phy name is optional, but should be checked if it's given */ 295 if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { 296 struct wpan_phy *phy2; 297 298 const char *pname = 299 nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 300 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] 301 != '\0') 302 /* name should be null-terminated */ 303 goto out_dev; 304 305 phy2 = wpan_phy_find(pname); 306 if (!phy2) 307 goto out_dev; 308 309 if (phy != phy2) { 310 wpan_phy_put(phy2); 311 goto out_dev; 312 } 313 } 314 315 rc = -ENOBUFS; 316 317 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); 318 if (!msg) 319 goto out_dev; 320 321 rtnl_lock(); 322 rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev); 323 324 /* We don't have device anymore */ 325 dev_put(dev); 326 dev = NULL; 327 328 rtnl_unlock(); 329 330 if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || 331 nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name)) 332 goto nla_put_failure; 333 wpan_phy_put(phy); 334 335 return ieee802154_nl_reply(msg, info); 336 337 nla_put_failure: 338 nlmsg_free(msg); 339 out_dev: 340 wpan_phy_put(phy); 341 if (dev) 342 dev_put(dev); 343 344 return rc; 345 } 346