net/ieee802154/nl-phy.c

   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 }