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 <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 }