| 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 | * 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 | |
| 98 | phy = wpan_phy_find(name); |
| 99 | if (!phy) |
| 100 | return -ENODEV; |
| 101 | |
| 102 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 103 | if (!msg) |
| 104 | goto out_dev; |
| 105 | |
| 106 | rc = ieee802154_nl_fill_phy(msg, info->snd_portid, 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 | 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).portid, |
| 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 | int ieee802154_dump_phy(struct sk_buff *skb, struct netlink_callback *cb) |
| 152 | { |
| 153 | struct dump_phy_data data = { |
| 154 | .cb = cb, |
| 155 | .skb = skb, |
| 156 | .s_idx = cb->args[0], |
| 157 | .idx = 0, |
| 158 | }; |
| 159 | |
| 160 | pr_debug("%s\n", __func__); |
| 161 | |
| 162 | wpan_phy_for_each(ieee802154_dump_phy_iter, &data); |
| 163 | |
| 164 | cb->args[0] = data.idx; |
| 165 | |
| 166 | return skb->len; |
| 167 | } |
| 168 | |
| 169 | int ieee802154_add_iface(struct sk_buff *skb, struct genl_info *info) |
| 170 | { |
| 171 | struct sk_buff *msg; |
| 172 | struct wpan_phy *phy; |
| 173 | const char *name; |
| 174 | const char *devname; |
| 175 | int rc = -ENOBUFS; |
| 176 | struct net_device *dev; |
| 177 | int type = __IEEE802154_DEV_INVALID; |
| 178 | |
| 179 | pr_debug("%s\n", __func__); |
| 180 | |
| 181 | if (!info->attrs[IEEE802154_ATTR_PHY_NAME]) |
| 182 | return -EINVAL; |
| 183 | |
| 184 | name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); |
| 185 | if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0') |
| 186 | return -EINVAL; /* phy name should be null-terminated */ |
| 187 | |
| 188 | if (info->attrs[IEEE802154_ATTR_DEV_NAME]) { |
| 189 | devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); |
| 190 | if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] |
| 191 | != '\0') |
| 192 | return -EINVAL; /* phy name should be null-terminated */ |
| 193 | } else { |
| 194 | devname = "wpan%d"; |
| 195 | } |
| 196 | |
| 197 | if (strlen(devname) >= IFNAMSIZ) |
| 198 | return -ENAMETOOLONG; |
| 199 | |
| 200 | phy = wpan_phy_find(name); |
| 201 | if (!phy) |
| 202 | return -ENODEV; |
| 203 | |
| 204 | msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE); |
| 205 | if (!msg) |
| 206 | goto out_dev; |
| 207 | |
| 208 | if (info->attrs[IEEE802154_ATTR_HW_ADDR] && |
| 209 | nla_len(info->attrs[IEEE802154_ATTR_HW_ADDR]) != |
| 210 | IEEE802154_ADDR_LEN) { |
| 211 | rc = -EINVAL; |
| 212 | goto nla_put_failure; |
| 213 | } |
| 214 | |
| 215 | if (info->attrs[IEEE802154_ATTR_DEV_TYPE]) { |
| 216 | type = nla_get_u8(info->attrs[IEEE802154_ATTR_DEV_TYPE]); |
| 217 | if (type >= __IEEE802154_DEV_MAX) { |
| 218 | rc = -EINVAL; |
| 219 | goto nla_put_failure; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | dev = rdev_add_virtual_intf_deprecated(wpan_phy_to_rdev(phy), devname, |
| 224 | type); |
| 225 | if (IS_ERR(dev)) { |
| 226 | rc = PTR_ERR(dev); |
| 227 | goto nla_put_failure; |
| 228 | } |
| 229 | dev_hold(dev); |
| 230 | |
| 231 | if (info->attrs[IEEE802154_ATTR_HW_ADDR]) { |
| 232 | struct sockaddr addr; |
| 233 | |
| 234 | addr.sa_family = ARPHRD_IEEE802154; |
| 235 | nla_memcpy(&addr.sa_data, info->attrs[IEEE802154_ATTR_HW_ADDR], |
| 236 | IEEE802154_ADDR_LEN); |
| 237 | |
| 238 | /* strangely enough, some callbacks (inetdev_event) from |
| 239 | * dev_set_mac_address require RTNL_LOCK |
| 240 | */ |
| 241 | rtnl_lock(); |
| 242 | rc = dev_set_mac_address(dev, &addr); |
| 243 | rtnl_unlock(); |
| 244 | if (rc) |
| 245 | goto dev_unregister; |
| 246 | } |
| 247 | |
| 248 | if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || |
| 249 | nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name)) |
| 250 | goto nla_put_failure; |
| 251 | dev_put(dev); |
| 252 | |
| 253 | wpan_phy_put(phy); |
| 254 | |
| 255 | return ieee802154_nl_reply(msg, info); |
| 256 | |
| 257 | dev_unregister: |
| 258 | rtnl_lock(); /* del_iface must be called with RTNL lock */ |
| 259 | rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev); |
| 260 | dev_put(dev); |
| 261 | rtnl_unlock(); |
| 262 | nla_put_failure: |
| 263 | nlmsg_free(msg); |
| 264 | out_dev: |
| 265 | wpan_phy_put(phy); |
| 266 | return rc; |
| 267 | } |
| 268 | |
| 269 | int ieee802154_del_iface(struct sk_buff *skb, struct genl_info *info) |
| 270 | { |
| 271 | struct sk_buff *msg; |
| 272 | struct wpan_phy *phy; |
| 273 | const char *name; |
| 274 | int rc; |
| 275 | struct net_device *dev; |
| 276 | |
| 277 | pr_debug("%s\n", __func__); |
| 278 | |
| 279 | if (!info->attrs[IEEE802154_ATTR_DEV_NAME]) |
| 280 | return -EINVAL; |
| 281 | |
| 282 | name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]); |
| 283 | if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0') |
| 284 | return -EINVAL; /* name should be null-terminated */ |
| 285 | |
| 286 | dev = dev_get_by_name(genl_info_net(info), name); |
| 287 | if (!dev) |
| 288 | return -ENODEV; |
| 289 | |
| 290 | phy = dev->ieee802154_ptr->wpan_phy; |
| 291 | BUG_ON(!phy); |
| 292 | get_device(&phy->dev); |
| 293 | |
| 294 | rc = -EINVAL; |
| 295 | /* phy name is optional, but should be checked if it's given */ |
| 296 | if (info->attrs[IEEE802154_ATTR_PHY_NAME]) { |
| 297 | struct wpan_phy *phy2; |
| 298 | |
| 299 | const char *pname = |
| 300 | nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]); |
| 301 | if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] |
| 302 | != '\0') |
| 303 | /* name should be null-terminated */ |
| 304 | goto out_dev; |
| 305 | |
| 306 | phy2 = wpan_phy_find(pname); |
| 307 | if (!phy2) |
| 308 | goto out_dev; |
| 309 | |
| 310 | if (phy != phy2) { |
| 311 | wpan_phy_put(phy2); |
| 312 | goto out_dev; |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | rc = -ENOBUFS; |
| 317 | |
| 318 | msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE); |
| 319 | if (!msg) |
| 320 | goto out_dev; |
| 321 | |
| 322 | rtnl_lock(); |
| 323 | rdev_del_virtual_intf_deprecated(wpan_phy_to_rdev(phy), dev); |
| 324 | |
| 325 | /* We don't have device anymore */ |
| 326 | dev_put(dev); |
| 327 | dev = NULL; |
| 328 | |
| 329 | rtnl_unlock(); |
| 330 | |
| 331 | if (nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) || |
| 332 | nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, name)) |
| 333 | goto nla_put_failure; |
| 334 | wpan_phy_put(phy); |
| 335 | |
| 336 | return ieee802154_nl_reply(msg, info); |
| 337 | |
| 338 | nla_put_failure: |
| 339 | nlmsg_free(msg); |
| 340 | out_dev: |
| 341 | wpan_phy_put(phy); |
| 342 | if (dev) |
| 343 | dev_put(dev); |
| 344 | |
| 345 | return rc; |
| 346 | } |