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 goto out; 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 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 static int ieee802154_list_phy(struct sk_buff *skb, 79 struct genl_info *info) 80 { 81 /* Request for interface name, index, type, IEEE address, 82 PAN Id, short address */ 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 98 phy = wpan_phy_find(name); 99 if (!phy) 100 return -ENODEV; 101 102 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 103 if (!msg) 104 goto out_dev; 105 106 rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq, 107 0, phy); 108 if (rc < 0) 109 goto out_free; 110 111 wpan_phy_put(phy); 112 113 return genlmsg_reply(msg, info); 114 out_free: 115 nlmsg_free(msg); 116 out_dev: 117 wpan_phy_put(phy); 118 return rc; 119 120 } 121 122 struct dump_phy_data { 123 struct sk_buff *skb; 124 struct netlink_callback *cb; 125 int idx, s_idx; 126 }; 127 128 static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data) 129 { 130 int rc; 131 struct dump_phy_data *data = _data; 132 133 pr_debug("%s\n", __func__); 134 135 if (data->idx++ < data->s_idx) 136 return 0; 137 138 rc = ieee802154_nl_fill_phy(data->skb, 139 NETLINK_CB(data->cb->skb).pid, 140 data->cb->nlh->nlmsg_seq, 141 NLM_F_MULTI, 142 phy); 143 144 if (rc < 0) { 145 data->idx--; 146 return rc; 147 } 148 149 return 0; 150 } 151 152 static int ieee802154_dump_phy(struct sk_buff *skb, 153 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 static int ieee802154_add_iface(struct sk_buff *skb, 172 struct genl_info *info) 173 { 174 struct sk_buff *msg; 175 struct wpan_phy *phy; 176 const char *name; 177 const char *devname; 178 int rc = -ENOBUFS; 179 struct net_device *dev; 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 dev = phy->add_iface(phy, devname); 216 if (IS_ERR(dev)) { 217 rc = PTR_ERR(dev); 218 goto nla_put_failure; 219 } 220 221 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 222 NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name); 223 224 dev_put(dev); 225 226 wpan_phy_put(phy); 227 228 return ieee802154_nl_reply(msg, info); 229 230 nla_put_failure: 231 nlmsg_free(msg); 232 out_dev: 233 wpan_phy_put(phy); 234 return rc; 235 } 236 237 static int ieee802154_del_iface(struct sk_buff *skb, 238 struct genl_info *info) 239 { 240 struct sk_buff *msg; 241 struct wpan_phy *phy; 242 const char *name; 243 int rc; 244 struct net_device *dev; 245 246 pr_debug("%s\n", __func__); 247 248 if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) 249 return -EINVAL; 250 251 name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); 252 if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') 253 return -EINVAL; /* name should be null-terminated */ 254 255 dev = dev_get_by_name(genl_info_net(info), name); 256 if (!dev) 257 return -ENODEV; 258 259 phy = ieee802154_mlme_ops(dev)->get_phy(dev); 260 BUG_ON(!phy); 261 262 rc = -EINVAL; 263 /* phy name is optional, but should be checked if it's given */ 264 if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { 265 struct wpan_phy *phy2; 266 267 const char *pname = 268 nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); 269 if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] 270 != '\0') 271 /* name should be null-terminated */ 272 goto out_dev; 273 274 phy2 = wpan_phy_find(pname); 275 if (!phy2) 276 goto out_dev; 277 278 if (phy != phy2) { 279 wpan_phy_put(phy2); 280 goto out_dev; 281 } 282 } 283 284 rc = -ENOBUFS; 285 286 msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); 287 if (!msg) 288 goto out_dev; 289 290 if (!phy->del_iface) { 291 rc = -EINVAL; 292 goto nla_put_failure; 293 } 294 295 rtnl_lock(); 296 phy->del_iface(phy, dev); 297 298 /* We don't have device anymore */ 299 dev_put(dev); 300 dev = NULL; 301 302 rtnl_unlock(); 303 304 305 NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)); 306 NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name); 307 308 wpan_phy_put(phy); 309 310 return ieee802154_nl_reply(msg, info); 311 312 nla_put_failure: 313 nlmsg_free(msg); 314 out_dev: 315 wpan_phy_put(phy); 316 if (dev) 317 dev_put(dev); 318 319 return rc; 320 } 321 322 static struct genl_ops ieee802154_phy_ops[] = { 323 IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy, 324 ieee802154_dump_phy), 325 IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface), 326 IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface), 327 }; 328 329 /* 330 * No need to unregister as family unregistration will do it. 331 */ 332 int nl802154_phy_register(void) 333 { 334 int i; 335 int rc; 336 337 for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) { 338 rc = genl_register_ops(&nl802154_family, 339 &ieee802154_phy_ops[i]); 340 if (rc) 341 return rc; 342 } 343 344 return 0; 345 } 346