include/net/ieee802154_netdev.h

   1 /*
   2  * An interface between IEEE802.15.4 device and rest of the kernel.
   3  *
   4  * Copyright (C) 2007-2012 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  * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
  17  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  18  * Maxim Osipov <maxim.osipov@siemens.com>
  19  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  20  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  21  */
  22
  23 #ifndef IEEE802154_NETDEVICE_H
  24 #define IEEE802154_NETDEVICE_H
  25
  26 #include <net/af_ieee802154.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/ieee802154.h>
  30
  31 #include <net/cfg802154.h>
  32
  33 struct ieee802154_sechdr {
  34 #if defined(__LITTLE_ENDIAN_BITFIELD)
  35         u8 level:3,
  36            key_id_mode:2,
  37            reserved:3;
  38 #elif defined(__BIG_ENDIAN_BITFIELD)
  39         u8 reserved:3,
  40            key_id_mode:2,
  41            level:3;
  42 #else
  43 #error  "Please fix <asm/byteorder.h>"
  44 #endif
  45         u8 key_id;
  46         __le32 frame_counter;
  47         union {
  48                 __le32 short_src;
  49                 __le64 extended_src;
  50         };
  51 };
  52
  53 struct ieee802154_addr {
  54         u8 mode;
  55         __le16 pan_id;
  56         union {
  57                 __le16 short_addr;
  58                 __le64 extended_addr;
  59         };
  60 };
  61
  62 struct ieee802154_hdr_fc {
  63 #if defined(__LITTLE_ENDIAN_BITFIELD)
  64         u16 type:3,
  65             security_enabled:1,
  66             frame_pending:1,
  67             ack_request:1,
  68             intra_pan:1,
  69             reserved:3,
  70             dest_addr_mode:2,
  71             version:2,
  72             source_addr_mode:2;
  73 #elif defined(__BIG_ENDIAN_BITFIELD)
  74         u16 reserved:1,
  75             intra_pan:1,
  76             ack_request:1,
  77             frame_pending:1,
  78             security_enabled:1,
  79             type:3,
  80             source_addr_mode:2,
  81             version:2,
  82             dest_addr_mode:2,
  83             reserved2:2;
  84 #else
  85 #error  "Please fix <asm/byteorder.h>"
  86 #endif
  87 };
  88
  89 struct ieee802154_hdr {
  90         struct ieee802154_hdr_fc fc;
  91         u8 seq;
  92         struct ieee802154_addr source;
  93         struct ieee802154_addr dest;
  94         struct ieee802154_sechdr sec;
  95 };
  96
  97 /* pushes hdr onto the skb. fields of hdr->fc that can be calculated from
  98  * the contents of hdr will be, and the actual value of those bits in
  99  * hdr->fc will be ignored. this includes the INTRA_PAN bit and the frame
 100  * version, if SECEN is set.
 101  */
 102 int ieee802154_hdr_push(struct sk_buff *skb, const struct ieee802154_hdr *hdr);
 103
 104 /* pulls the entire 802.15.4 header off of the skb, including the security
 105  * header, and performs pan id decompression
 106  */
 107 int ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr);
 108
 109 /* parses the frame control, sequence number of address fields in a given skb
 110  * and stores them into hdr, performing pan id decompression and length checks
 111  * to be suitable for use in header_ops.parse
 112  */
 113 int ieee802154_hdr_peek_addrs(const struct sk_buff *skb,
 114                               struct ieee802154_hdr *hdr);
 115
 116 /* parses the full 802.15.4 header a given skb and stores them into hdr,
 117  * performing pan id decompression and length checks to be suitable for use in
 118  * header_ops.parse
 119  */
 120 int ieee802154_hdr_peek(const struct sk_buff *skb, struct ieee802154_hdr *hdr);
 121
 122 int ieee802154_max_payload(const struct ieee802154_hdr *hdr);
 123
 124 static inline int
 125 ieee802154_sechdr_authtag_len(const struct ieee802154_sechdr *sec)
 126 {
 127         switch (sec->level) {
 128         case IEEE802154_SCF_SECLEVEL_MIC32:
 129         case IEEE802154_SCF_SECLEVEL_ENC_MIC32:
 130                 return 4;
 131         case IEEE802154_SCF_SECLEVEL_MIC64:
 132         case IEEE802154_SCF_SECLEVEL_ENC_MIC64:
 133                 return 8;
 134         case IEEE802154_SCF_SECLEVEL_MIC128:
 135         case IEEE802154_SCF_SECLEVEL_ENC_MIC128:
 136                 return 16;
 137         case IEEE802154_SCF_SECLEVEL_NONE:
 138         case IEEE802154_SCF_SECLEVEL_ENC:
 139         default:
 140                 return 0;
 141         }
 142 }
 143
 144 static inline int ieee802154_hdr_length(struct sk_buff *skb)
 145 {
 146         struct ieee802154_hdr hdr;
 147         int len = ieee802154_hdr_pull(skb, &hdr);
 148
 149         if (len > 0)
 150                 skb_push(skb, len);
 151
 152         return len;
 153 }
 154
 155 static inline bool ieee802154_addr_equal(const struct ieee802154_addr *a1,
 156                                          const struct ieee802154_addr *a2)
 157 {
 158         if (a1->pan_id != a2->pan_id || a1->mode != a2->mode)
 159                 return false;
 160
 161         if ((a1->mode == IEEE802154_ADDR_LONG &&
 162              a1->extended_addr != a2->extended_addr) ||
 163             (a1->mode == IEEE802154_ADDR_SHORT &&
 164              a1->short_addr != a2->short_addr))
 165                 return false;
 166
 167         return true;
 168 }
 169
 170 static inline __le64 ieee802154_devaddr_from_raw(const void *raw)
 171 {
 172         u64 temp;
 173
 174         memcpy(&temp, raw, IEEE802154_ADDR_LEN);
 175         return (__force __le64)swab64(temp);
 176 }
 177
 178 static inline void ieee802154_devaddr_to_raw(void *raw, __le64 addr)
 179 {
 180         u64 temp = swab64((__force u64)addr);
 181
 182         memcpy(raw, &temp, IEEE802154_ADDR_LEN);
 183 }
 184
 185 static inline void ieee802154_addr_from_sa(struct ieee802154_addr *a,
 186                                            const struct ieee802154_addr_sa *sa)
 187 {
 188         a->mode = sa->addr_type;
 189         a->pan_id = cpu_to_le16(sa->pan_id);
 190
 191         switch (a->mode) {
 192         case IEEE802154_ADDR_SHORT:
 193                 a->short_addr = cpu_to_le16(sa->short_addr);
 194                 break;
 195         case IEEE802154_ADDR_LONG:
 196                 a->extended_addr = ieee802154_devaddr_from_raw(sa->hwaddr);
 197                 break;
 198         }
 199 }
 200
 201 static inline void ieee802154_addr_to_sa(struct ieee802154_addr_sa *sa,
 202                                          const struct ieee802154_addr *a)
 203 {
 204         sa->addr_type = a->mode;
 205         sa->pan_id = le16_to_cpu(a->pan_id);
 206
 207         switch (a->mode) {
 208         case IEEE802154_ADDR_SHORT:
 209                 sa->short_addr = le16_to_cpu(a->short_addr);
 210                 break;
 211         case IEEE802154_ADDR_LONG:
 212                 ieee802154_devaddr_to_raw(sa->hwaddr, a->extended_addr);
 213                 break;
 214         }
 215 }
 216
 217 /*
 218  * A control block of skb passed between the ARPHRD_IEEE802154 device
 219  * and other stack parts.
 220  */
 221 struct ieee802154_mac_cb {
 222         u8 lqi;
 223         u8 type;
 224         bool ackreq;
 225         bool secen;
 226         bool secen_override;
 227         u8 seclevel;
 228         bool seclevel_override;
 229         struct ieee802154_addr source;
 230         struct ieee802154_addr dest;
 231 };
 232
 233 static inline struct ieee802154_mac_cb *mac_cb(struct sk_buff *skb)
 234 {
 235         return (struct ieee802154_mac_cb *)skb->cb;
 236 }
 237
 238 static inline struct ieee802154_mac_cb *mac_cb_init(struct sk_buff *skb)
 239 {
 240         BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
 241
 242         memset(skb->cb, 0, sizeof(struct ieee802154_mac_cb));
 243         return mac_cb(skb);
 244 }
 245
 246 #define IEEE802154_LLSEC_KEY_SIZE 16
 247
 248 struct ieee802154_llsec_key_id {
 249         u8 mode;
 250         u8 id;
 251         union {
 252                 struct ieee802154_addr device_addr;
 253                 __le32 short_source;
 254                 __le64 extended_source;
 255         };
 256 };
 257
 258 struct ieee802154_llsec_key {
 259         u8 frame_types;
 260         u32 cmd_frame_ids;
 261         u8 key[IEEE802154_LLSEC_KEY_SIZE];
 262 };
 263
 264 struct ieee802154_llsec_key_entry {
 265         struct list_head list;
 266
 267         struct ieee802154_llsec_key_id id;
 268         struct ieee802154_llsec_key *key;
 269 };
 270
 271 struct ieee802154_llsec_device_key {
 272         struct list_head list;
 273
 274         struct ieee802154_llsec_key_id key_id;
 275         u32 frame_counter;
 276 };
 277
 278 enum {
 279         IEEE802154_LLSEC_DEVKEY_IGNORE,
 280         IEEE802154_LLSEC_DEVKEY_RESTRICT,
 281         IEEE802154_LLSEC_DEVKEY_RECORD,
 282
 283         __IEEE802154_LLSEC_DEVKEY_MAX,
 284 };
 285
 286 struct ieee802154_llsec_device {
 287         struct list_head list;
 288
 289         __le16 pan_id;
 290         __le16 short_addr;
 291         __le64 hwaddr;
 292         u32 frame_counter;
 293         bool seclevel_exempt;
 294
 295         u8 key_mode;
 296         struct list_head keys;
 297 };
 298
 299 struct ieee802154_llsec_seclevel {
 300         struct list_head list;
 301
 302         u8 frame_type;
 303         u8 cmd_frame_id;
 304         bool device_override;
 305         u32 sec_levels;
 306 };
 307
 308 struct ieee802154_llsec_params {
 309         bool enabled;
 310
 311         __be32 frame_counter;
 312         u8 out_level;
 313         struct ieee802154_llsec_key_id out_key;
 314
 315         __le64 default_key_source;
 316
 317         __le16 pan_id;
 318         __le64 hwaddr;
 319         __le64 coord_hwaddr;
 320         __le16 coord_shortaddr;
 321 };
 322
 323 struct ieee802154_llsec_table {
 324         struct list_head keys;
 325         struct list_head devices;
 326         struct list_head security_levels;
 327 };
 328
 329 #define IEEE802154_MAC_SCAN_ED          0
 330 #define IEEE802154_MAC_SCAN_ACTIVE      1
 331 #define IEEE802154_MAC_SCAN_PASSIVE     2
 332 #define IEEE802154_MAC_SCAN_ORPHAN      3
 333
 334 struct ieee802154_mac_params {
 335         s8 transmit_power;
 336         u8 min_be;
 337         u8 max_be;
 338         u8 csma_retries;
 339         s8 frame_retries;
 340
 341         bool lbt;
 342         struct wpan_phy_cca cca;
 343         s32 cca_ed_level;
 344 };
 345
 346 struct wpan_phy;
 347
 348 enum {
 349         IEEE802154_LLSEC_PARAM_ENABLED          = BIT(0),
 350         IEEE802154_LLSEC_PARAM_FRAME_COUNTER    = BIT(1),
 351         IEEE802154_LLSEC_PARAM_OUT_LEVEL        = BIT(2),
 352         IEEE802154_LLSEC_PARAM_OUT_KEY          = BIT(3),
 353         IEEE802154_LLSEC_PARAM_KEY_SOURCE       = BIT(4),
 354         IEEE802154_LLSEC_PARAM_PAN_ID           = BIT(5),
 355         IEEE802154_LLSEC_PARAM_HWADDR           = BIT(6),
 356         IEEE802154_LLSEC_PARAM_COORD_HWADDR     = BIT(7),
 357         IEEE802154_LLSEC_PARAM_COORD_SHORTADDR  = BIT(8),
 358 };
 359
 360 struct ieee802154_llsec_ops {
 361         int (*get_params)(struct net_device *dev,
 362                           struct ieee802154_llsec_params *params);
 363         int (*set_params)(struct net_device *dev,
 364                           const struct ieee802154_llsec_params *params,
 365                           int changed);
 366
 367         int (*add_key)(struct net_device *dev,
 368                        const struct ieee802154_llsec_key_id *id,
 369                        const struct ieee802154_llsec_key *key);
 370         int (*del_key)(struct net_device *dev,
 371                        const struct ieee802154_llsec_key_id *id);
 372
 373         int (*add_dev)(struct net_device *dev,
 374                        const struct ieee802154_llsec_device *llsec_dev);
 375         int (*del_dev)(struct net_device *dev, __le64 dev_addr);
 376
 377         int (*add_devkey)(struct net_device *dev,
 378                           __le64 device_addr,
 379                           const struct ieee802154_llsec_device_key *key);
 380         int (*del_devkey)(struct net_device *dev,
 381                           __le64 device_addr,
 382                           const struct ieee802154_llsec_device_key *key);
 383
 384         int (*add_seclevel)(struct net_device *dev,
 385                             const struct ieee802154_llsec_seclevel *sl);
 386         int (*del_seclevel)(struct net_device *dev,
 387                             const struct ieee802154_llsec_seclevel *sl);
 388
 389         void (*lock_table)(struct net_device *dev);
 390         void (*get_table)(struct net_device *dev,
 391                           struct ieee802154_llsec_table **t);
 392         void (*unlock_table)(struct net_device *dev);
 393 };
 394 /*
 395  * This should be located at net_device->ml_priv
 396  *
 397  * get_phy should increment the reference counting on returned phy.
 398  * Use wpan_wpy_put to put that reference.
 399  */
 400 struct ieee802154_mlme_ops {
 401         /* The following fields are optional (can be NULL). */
 402
 403         int (*assoc_req)(struct net_device *dev,
 404                         struct ieee802154_addr *addr,
 405                         u8 channel, u8 page, u8 cap);
 406         int (*assoc_resp)(struct net_device *dev,
 407                         struct ieee802154_addr *addr,
 408                         __le16 short_addr, u8 status);
 409         int (*disassoc_req)(struct net_device *dev,
 410                         struct ieee802154_addr *addr,
 411                         u8 reason);
 412         int (*start_req)(struct net_device *dev,
 413                         struct ieee802154_addr *addr,
 414                         u8 channel, u8 page, u8 bcn_ord, u8 sf_ord,
 415                         u8 pan_coord, u8 blx, u8 coord_realign);
 416         int (*scan_req)(struct net_device *dev,
 417                         u8 type, u32 channels, u8 page, u8 duration);
 418
 419         int (*set_mac_params)(struct net_device *dev,
 420                               const struct ieee802154_mac_params *params);
 421         void (*get_mac_params)(struct net_device *dev,
 422                                struct ieee802154_mac_params *params);
 423
 424         struct ieee802154_llsec_ops *llsec;
 425 };
 426
 427 static inline struct ieee802154_mlme_ops *
 428 ieee802154_mlme_ops(const struct net_device *dev)
 429 {
 430         return dev->ml_priv;
 431 }
 432
 433 #endif