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 <net/netlink.h> 27 #include <net/genetlink.h> 28 #include <net/wpan-phy.h> 29 #include <net/af_ieee802154.h> 30 #include <net/ieee802154_netdev.h> 31 #include <net/rtnetlink.h> /* for rtnl_{un,}lock */ 32 #include <linux/nl802154.h> 33 34 #include "ieee802154.h" 35 36 static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid, 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 goto out; 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 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 55 56 NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page); 57 NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel); 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 66 mutex_unlock(&phy->pib_lock); 67 return genlmsg_end(msg, hdr); 68 69 nla_put_failure: 70 mutex_unlock(&phy->pib_lock); 71 genlmsg_cancel(msg, hdr); 72 out: 73 kfree(buf); 74 return -EMSGSIZE; 75 } 76 77 static int ieee802154_list_phy(struct sk_buff *skb, 78 struct genl_info *info) 79 { 80 /* Request for interface name, index, type, IEEE address, 81 PAN Id, short address */ 82 struct sk_buff *msg; 83 struct wpan_phy *phy; 84 const char *name; 85 int rc = -ENOBUFS; 86 87 pr_debug("%s\n", __func__); 88 89 if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) 90 return -EINVAL; 91 92 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 93 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') 94 return -EINVAL; /* phy name should be null-terminated */ 95 96 97 phy = wpan_phy_find(name); 98 if (!phy) 99 return -ENODEV; 100 101 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 102 if (!msg) 103 goto out_dev; 104 105 rc = ieee802154_nl_fill_phy(msg, info->snd_pid, 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 } 120 121 struct dump_phy_data { 122 struct sk_buff *skb; 123 struct netlink_callback *cb; 124 int idx, s_idx; 125 }; 126 127 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data) 128 { 129 int rc; 130 struct dump_phy_data *data = _data; 131 132 pr_debug("%s\n", __func__); 133 134 if (data->idx++ < data->s_idx) 135 return 0; 136 137 rc = ieee802154_nl_fill_phy(data->skb, 138 NETLINK_CB(data->cb->skb).pid, 139 data->cb->nlh->nlmsg_seq, 140 NLM_F_MULTI, 141 phy); 142 143 if (rc < 0) { 144 data->idx--; 145 return rc; 146 } 147 148 return 0; 149 } 150 151 static int ieee802154_dump_phy(struct sk_buff *skb, 152 struct netlink_callback *cb) 153 { 154 struct dump_phy_data data = { 155 .cb = cb, 156 .skb = skb, 157 .s_idx = cb->args[0], 158 .idx = 0, 159 }; 160 161 pr_debug("%s\n", __func__); 162 163 wpan_phy_for_each(ieee802154_dump_phy_iter, &data); 164 165 cb->args[0] = data.idx; 166 167 return skb->len; 168 } 169 170 static int ieee802154_add_iface(struct sk_buff *skb, 171 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; 179 180 pr_debug("%s\n", __func__); 181 182 if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) 183 return -EINVAL; 184 185 name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 186 if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') 187 return -EINVAL; /* phy name should be null-terminated */ 188 189 if (info->attrs[IEEE802154_ATTR_DEV_NAME]) { 190 devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 191 if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] 192 != '\0') 193 return -EINVAL; /* phy name should be null-terminated */ 194 } else { 195 devname = "wpan%d"; 196 } 197 198 if (strlen(devname) >= IFNAMSIZ) 199 return -ENAMETOOLONG; 200 201 phy = wpan_phy_find(name); 202 if (!phy) 203 return -ENODEV; 204 205 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE); 206 if (!msg) 207 goto out_dev; 208 209 if (!phy->add_iface) { 210 rc = -EINVAL; 211 goto nla_put_failure; 212 } 213 214 dev = phy->add_iface(phy, devname); 215 if (IS_ERR(dev)) { 216 rc = PTR_ERR(dev); 217 goto nla_put_failure; 218 } 219 220 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 221 NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name); 222 223 dev_put(dev); 224 225 wpan_phy_put(phy); 226 227 return ieee802154_nl_reply(msg, info); 228 229 nla_put_failure: 230 nlmsg_free(msg); 231 out_dev: 232 wpan_phy_put(phy); 233 return rc; 234 } 235 236 static int ieee802154_del_iface(struct sk_buff *skb, 237 struct genl_info *info) 238 { 239 struct sk_buff *msg; 240 struct wpan_phy *phy; 241 const char *name; 242 int rc; 243 struct net_device *dev; 244 245 pr_debug("%s\n", __func__); 246 247 if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) 248 return -EINVAL; 249 250 name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 251 if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') 252 return -EINVAL; /* name should be null-terminated */ 253 254 dev = dev_get_by_name(genl_info_net(info), name); 255 if (!dev) 256 return -ENODEV; 257 258 phy = ieee802154_mlme_ops(dev)->get_phy(dev); 259 BUG_ON(!phy); 260 261 rc = -EINVAL; 262 /* phy name is optional, but should be checked if it's given */ 263 if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { 264 struct wpan_phy *phy2; 265 266 const char *pname = 267 nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 268 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] 269 != '\0') 270 /* name should be null-terminated */ 271 goto out_dev; 272 273 phy2 = wpan_phy_find(pname); 274 if (!phy2) 275 goto out_dev; 276 277 if (phy != phy2) { 278 wpan_phy_put(phy2); 279 goto out_dev; 280 } 281 } 282 283 rc = -ENOBUFS; 284 285 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); 286 if (!msg) 287 goto out_dev; 288 289 if (!phy->del_iface) { 290 rc = -EINVAL; 291 goto nla_put_failure; 292 } 293 294 rtnl_lock(); 295 phy->del_iface(phy, dev); 296 297 /* We don't have device anymore */ 298 dev_put(dev); 299 dev = NULL; 300 301 rtnl_unlock(); 302 303 304 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 305 NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name); 306 307 wpan_phy_put(phy); 308 309 return ieee802154_nl_reply(msg, info); 310 311 nla_put_failure: 312 nlmsg_free(msg); 313 out_dev: 314 wpan_phy_put(phy); 315 if (dev) 316 dev_put(dev); 317 318 return rc; 319 } 320 321 static struct genl_ops ieee802154_phy_ops[] = { 322 IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy, 323 ieee802154_dump_phy), 324 IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface), 325 IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface), 326 }; 327 328 /* 329 * No need to unregister as family unregistration will do it. 330 */ 331 int nl802154_phy_register(void) 332 { 333 int i; 334 int rc; 335 336 for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) { 337 rc = genl_register_ops(&nl802154_family, 338 &ieee802154_phy_ops[i]); 339 if (rc) 340 return rc; 341 } 342 343 return 0; 344 } 345