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 <net/netlink.h> 28 #include <net/genetlink.h> 29 #include <net/wpan-phy.h> 30 #include <net/af_ieee802154.h> 31 #include <net/ieee802154_netdev.h> 32 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */ 33 #include <linux/nl802154.h> 34 35 #include "ieee802154.h" 36 37 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid, 38 u32 seq, int flags, struct wpan_phy *phy) 39 { 40 void *hdr; 41 int i, pages = 0; 42 uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL); 43 44 pr_debug("%s\n", __func__); 45 46 if (!buf) 47 return -EMSGSIZE; 48 49 hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags, 50 IEEE802154_LIST_PHY); 51 if (!hdr) 52 goto out; 53 54 mutex_lock(&phy->pib_lock); 55 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 56 57 NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page); 58 NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel); 59 for (i = 0; i < 32; i++) { 60 if (phy->channels_supported[i]) 61 buf[pages++] = phy->channels_supported[i] | (i << 27); 62 } 63 if (pages) 64 NLA_PUT(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST, 65 pages * sizeof(uint32_t), buf); 66 67 mutex_unlock(&phy->pib_lock); 68 kfree(buf); 69 return genlmsg_end(msg, hdr); 70 71 nla_put_failure: 72 mutex_unlock(&phy->pib_lock); 73 genlmsg_cancel(msg, hdr); 74 out: 75 kfree(buf); 76 return -EMSGSIZE; 77 } 78 79 static int ieee802154_list_phy(struct sk_buff *skb, 80 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_GOODSIZE, GFP_KERNEL); 104 if (!msg) 105 goto out_dev; 106 107 rc = ieee802154_nl_fill_phy(msg, info->snd_pid, 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).pid, 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 static int ieee802154_dump_phy(struct sk_buff *skb, 154 struct netlink_callback *cb) 155 { 156 struct dump_phy_data data = { 157 .cb = cb, 158 .skb = skb, 159 .s_idx = cb->args[0], 160 .idx = 0, 161 }; 162 163 pr_debug("%s\n", __func__); 164 165 wpan_phy_for_each(ieee802154_dump_phy_iter, &data); 166 167 cb->args[0] = data.idx; 168 169 return skb->len; 170 } 171 172 static int ieee802154_add_iface(struct sk_buff *skb, 173 struct genl_info *info) 174 { 175 struct sk_buff *msg; 176 struct wpan_phy *phy; 177 const char *name; 178 const char *devname; 179 int rc = -ENOBUFS; 180 struct net_device *dev; 181 182 pr_debug("%s\n", __func__); 183 184 if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) 185 return -EINVAL; 186 187 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 188 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') 189 return -EINVAL; /* phy name should be null-terminated */ 190 191 if (info->attrs[IEEE802154_ATTR_DEV_NAME]) { 192 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 193 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] 194 != '\0') 195 return -EINVAL; /* phy name should be null-terminated */ 196 } else { 197 devname = "wpan%d"; 198 } 199 200 if (strlen(devname) >= IFNAMSIZ) 201 return -ENAMETOOLONG; 202 203 phy = wpan_phy_find(name); 204 if (!phy) 205 return -ENODEV; 206 207 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE); 208 if (!msg) 209 goto out_dev; 210 211 if (!phy->add_iface) { 212 rc = -EINVAL; 213 goto nla_put_failure; 214 } 215 216 dev = phy->add_iface(phy, devname); 217 if (IS_ERR(dev)) { 218 rc = PTR_ERR(dev); 219 goto nla_put_failure; 220 } 221 222 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 223 NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name); 224 225 dev_put(dev); 226 227 wpan_phy_put(phy); 228 229 return ieee802154_nl_reply(msg, info); 230 231 nla_put_failure: 232 nlmsg_free(msg); 233 out_dev: 234 wpan_phy_put(phy); 235 return rc; 236 } 237 238 static int ieee802154_del_iface(struct sk_buff *skb, 239 struct genl_info *info) 240 { 241 struct sk_buff *msg; 242 struct wpan_phy *phy; 243 const char *name; 244 int rc; 245 struct net_device *dev; 246 247 pr_debug("%s\n", __func__); 248 249 if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) 250 return -EINVAL; 251 252 name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 253 if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') 254 return -EINVAL; /* name should be null-terminated */ 255 256 dev = dev_get_by_name(genl_info_net(info), name); 257 if (!dev) 258 return -ENODEV; 259 260 phy = ieee802154_mlme_ops(dev)->get_phy(dev); 261 BUG_ON(!phy); 262 263 rc = -EINVAL; 264 /* phy name is optional, but should be checked if it's given */ 265 if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { 266 struct wpan_phy *phy2; 267 268 const char *pname = 269 nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 270 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] 271 != '\0') 272 /* name should be null-terminated */ 273 goto out_dev; 274 275 phy2 = wpan_phy_find(pname); 276 if (!phy2) 277 goto out_dev; 278 279 if (phy != phy2) { 280 wpan_phy_put(phy2); 281 goto out_dev; 282 } 283 } 284 285 rc = -ENOBUFS; 286 287 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); 288 if (!msg) 289 goto out_dev; 290 291 if (!phy->del_iface) { 292 rc = -EINVAL; 293 goto nla_put_failure; 294 } 295 296 rtnl_lock(); 297 phy->del_iface(phy, dev); 298 299 /* We don't have device anymore */ 300 dev_put(dev); 301 dev = NULL; 302 303 rtnl_unlock(); 304 305 306 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 307 NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name); 308 309 wpan_phy_put(phy); 310 311 return ieee802154_nl_reply(msg, info); 312 313 nla_put_failure: 314 nlmsg_free(msg); 315 out_dev: 316 wpan_phy_put(phy); 317 if (dev) 318 dev_put(dev); 319 320 return rc; 321 } 322 323 static struct genl_ops ieee802154_phy_ops[] = { 324 IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy, 325 ieee802154_dump_phy), 326 IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface), 327 IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface), 328 }; 329 330 /* 331 * No need to unregister as family unregistration will do it. 332 */ 333 int nl802154_phy_register(void) 334 { 335 int i; 336 int rc; 337 338 for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) { 339 rc = genl_register_ops(&nl802154_family, 340 &ieee802154_phy_ops[i]); 341 if (rc) 342 return rc; 343 } 344 345 return 0; 346 } 347