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_hdr_fc {
  54 #if defined(__LITTLE_ENDIAN_BITFIELD)
  55         u16 type:3,
  56             security_enabled:1,
  57             frame_pending:1,
  58             ack_request:1,
  59             intra_pan:1,
  60             reserved:3,
  61             dest_addr_mode:2,
  62             version:2,
  63             source_addr_mode:2;
  64 #elif defined(__BIG_ENDIAN_BITFIELD)
  65         u16 reserved:1,
  66             intra_pan:1,
  67             ack_request:1,
  68             frame_pending:1,
  69             security_enabled:1,
  70             type:3,
  71             source_addr_mode:2,
  72             version:2,
  73             dest_addr_mode:2,
  74             reserved2:2;
  75 #else
  76 #error  "Please fix <asm/byteorder.h>"
  77 #endif
  78 };
  79
  80 struct ieee802154_hdr {
  81         struct ieee802154_hdr_fc fc;
  82         u8 seq;
  83         struct ieee802154_addr source;
  84         struct ieee802154_addr dest;
  85         struct ieee802154_sechdr sec;
  86 };
  87
  88 /* pushes hdr onto the skb. fields of hdr->fc that can be calculated from
  89  * the contents of hdr will be, and the actual value of those bits in
  90  * hdr->fc will be ignored. this includes the INTRA_PAN bit and the frame
  91  * version, if SECEN is set.
  92  */
  93 int ieee802154_hdr_push(struct sk_buff *skb, struct ieee802154_hdr *hdr);
  94
  95 /* pulls the entire 802.15.4 header off of the skb, including the security
  96  * header, and performs pan id decompression
  97  */
  98 int ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr);
  99
 100 /* parses the frame control, sequence number of address fields in a given skb
 101  * and stores them into hdr, performing pan id decompression and length checks
 102  * to be suitable for use in header_ops.parse
 103  */
 104 int ieee802154_hdr_peek_addrs(const struct sk_buff *skb,
 105                               struct ieee802154_hdr *hdr);
 106
 107 /* parses the full 802.15.4 header a given skb and stores them into hdr,
 108  * performing pan id decompression and length checks to be suitable for use in
 109  * header_ops.parse
 110  */
 111 int ieee802154_hdr_peek(const struct sk_buff *skb, struct ieee802154_hdr *hdr);
 112
 113 int ieee802154_max_payload(const struct ieee802154_hdr *hdr);
 114
 115 static inline int
 116 ieee802154_sechdr_authtag_len(const struct ieee802154_sechdr *sec)
 117 {
 118         switch (sec->level) {
 119         case IEEE802154_SCF_SECLEVEL_MIC32:
 120         case IEEE802154_SCF_SECLEVEL_ENC_MIC32:
 121                 return 4;
 122         case IEEE802154_SCF_SECLEVEL_MIC64:
 123         case IEEE802154_SCF_SECLEVEL_ENC_MIC64:
 124                 return 8;
 125         case IEEE802154_SCF_SECLEVEL_MIC128:
 126         case IEEE802154_SCF_SECLEVEL_ENC_MIC128:
 127                 return 16;
 128         case IEEE802154_SCF_SECLEVEL_NONE:
 129         case IEEE802154_SCF_SECLEVEL_ENC:
 130         default:
 131                 return 0;
 132         }
 133 }
 134
 135 static inline int ieee802154_hdr_length(struct sk_buff *skb)
 136 {
 137         struct ieee802154_hdr hdr;
 138         int len = ieee802154_hdr_pull(skb, &hdr);
 139
 140         if (len > 0)
 141                 skb_push(skb, len);
 142
 143         return len;
 144 }
 145
 146 static inline bool ieee802154_addr_equal(const struct ieee802154_addr *a1,
 147                                          const struct ieee802154_addr *a2)
 148 {
 149         if (a1->pan_id != a2->pan_id || a1->mode != a2->mode)
 150                 return false;
 151
 152         if ((a1->mode == IEEE802154_ADDR_LONG &&
 153              a1->extended_addr != a2->extended_addr) ||
 154             (a1->mode == IEEE802154_ADDR_SHORT &&
 155              a1->short_addr != a2->short_addr))
 156                 return false;
 157
 158         return true;
 159 }
 160
 161 static inline __le64 ieee802154_devaddr_from_raw(const void *raw)
 162 {
 163         u64 temp;
 164
 165         memcpy(&temp, raw, IEEE802154_ADDR_LEN);
 166         return (__force __le64)swab64(temp);
 167 }
 168
 169 static inline void ieee802154_devaddr_to_raw(void *raw, __le64 addr)
 170 {
 171         u64 temp = swab64((__force u64)addr);
 172
 173         memcpy(raw, &temp, IEEE802154_ADDR_LEN);
 174 }
 175
 176 static inline void ieee802154_addr_from_sa(struct ieee802154_addr *a,
 177                                            const struct ieee802154_addr_sa *sa)
 178 {
 179         a->mode = sa->addr_type;
 180         a->pan_id = cpu_to_le16(sa->pan_id);
 181
 182         switch (a->mode) {
 183         case IEEE802154_ADDR_SHORT:
 184                 a->short_addr = cpu_to_le16(sa->short_addr);
 185                 break;
 186         case IEEE802154_ADDR_LONG:
 187                 a->extended_addr = ieee802154_devaddr_from_raw(sa->hwaddr);
 188                 break;
 189         }
 190 }
 191
 192 static inline void ieee802154_addr_to_sa(struct ieee802154_addr_sa *sa,
 193                                          const struct ieee802154_addr *a)
 194 {
 195         sa->addr_type = a->mode;
 196         sa->pan_id = le16_to_cpu(a->pan_id);
 197
 198         switch (a->mode) {
 199         case IEEE802154_ADDR_SHORT:
 200                 sa->short_addr = le16_to_cpu(a->short_addr);
 201                 break;
 202         case IEEE802154_ADDR_LONG:
 203                 ieee802154_devaddr_to_raw(sa->hwaddr, a->extended_addr);
 204                 break;
 205         }
 206 }
 207
 208 /*
 209  * A control block of skb passed between the ARPHRD_IEEE802154 device
 210  * and other stack parts.
 211  */
 212 struct ieee802154_mac_cb {
 213         u8 lqi;
 214         u8 type;
 215         bool ackreq;
 216         bool secen;
 217         bool secen_override;
 218         u8 seclevel;
 219         bool seclevel_override;
 220         struct ieee802154_addr source;
 221         struct ieee802154_addr dest;
 222 };
 223
 224 static inline struct ieee802154_mac_cb *mac_cb(struct sk_buff *skb)
 225 {
 226         return (struct ieee802154_mac_cb *)skb->cb;
 227 }
 228
 229 static inline struct ieee802154_mac_cb *mac_cb_init(struct sk_buff *skb)
 230 {
 231         BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
 232
 233         memset(skb->cb, 0, sizeof(struct ieee802154_mac_cb));
 234         return mac_cb(skb);
 235 }
 236
 237 enum {
 238         IEEE802154_LLSEC_DEVKEY_IGNORE,
 239         IEEE802154_LLSEC_DEVKEY_RESTRICT,
 240         IEEE802154_LLSEC_DEVKEY_RECORD,
 241
 242         __IEEE802154_LLSEC_DEVKEY_MAX,
 243 };
 244
 245 #define IEEE802154_MAC_SCAN_ED          0
 246 #define IEEE802154_MAC_SCAN_ACTIVE      1
 247 #define IEEE802154_MAC_SCAN_PASSIVE     2
 248 #define IEEE802154_MAC_SCAN_ORPHAN      3
 249
 250 struct ieee802154_mac_params {
 251         s8 transmit_power;
 252         u8 min_be;
 253         u8 max_be;
 254         u8 csma_retries;
 255         s8 frame_retries;
 256
 257         bool lbt;
 258         struct wpan_phy_cca cca;
 259         s32 cca_ed_level;
 260 };
 261
 262 struct wpan_phy;
 263
 264 enum {
 265         IEEE802154_LLSEC_PARAM_ENABLED          = BIT(0),
 266         IEEE802154_LLSEC_PARAM_FRAME_COUNTER    = BIT(1),
 267         IEEE802154_LLSEC_PARAM_OUT_LEVEL        = BIT(2),
 268         IEEE802154_LLSEC_PARAM_OUT_KEY          = BIT(3),
 269         IEEE802154_LLSEC_PARAM_KEY_SOURCE       = BIT(4),
 270         IEEE802154_LLSEC_PARAM_PAN_ID           = BIT(5),
 271         IEEE802154_LLSEC_PARAM_HWADDR           = BIT(6),
 272         IEEE802154_LLSEC_PARAM_COORD_HWADDR     = BIT(7),
 273         IEEE802154_LLSEC_PARAM_COORD_SHORTADDR  = BIT(8),
 274 };
 275
 276 struct ieee802154_llsec_ops {
 277         int (*get_params)(struct net_device *dev,
 278                           struct ieee802154_llsec_params *params);
 279         int (*set_params)(struct net_device *dev,
 280                           const struct ieee802154_llsec_params *params,
 281                           int changed);
 282
 283         int (*add_key)(struct net_device *dev,
 284                        const struct ieee802154_llsec_key_id *id,
 285                        const struct ieee802154_llsec_key *key);
 286         int (*del_key)(struct net_device *dev,
 287                        const struct ieee802154_llsec_key_id *id);
 288
 289         int (*add_dev)(struct net_device *dev,
 290                        const struct ieee802154_llsec_device *llsec_dev);
 291         int (*del_dev)(struct net_device *dev, __le64 dev_addr);
 292
 293         int (*add_devkey)(struct net_device *dev,
 294                           __le64 device_addr,
 295                           const struct ieee802154_llsec_device_key *key);
 296         int (*del_devkey)(struct net_device *dev,
 297                           __le64 device_addr,
 298                           const struct ieee802154_llsec_device_key *key);
 299
 300         int (*add_seclevel)(struct net_device *dev,
 301                             const struct ieee802154_llsec_seclevel *sl);
 302         int (*del_seclevel)(struct net_device *dev,
 303                             const struct ieee802154_llsec_seclevel *sl);
 304
 305         void (*lock_table)(struct net_device *dev);
 306         void (*get_table)(struct net_device *dev,
 307                           struct ieee802154_llsec_table **t);
 308         void (*unlock_table)(struct net_device *dev);
 309 };
 310 /*
 311  * This should be located at net_device->ml_priv
 312  *
 313  * get_phy should increment the reference counting on returned phy.
 314  * Use wpan_wpy_put to put that reference.
 315  */
 316 struct ieee802154_mlme_ops {
 317         /* The following fields are optional (can be NULL). */
 318
 319         int (*assoc_req)(struct net_device *dev,
 320                         struct ieee802154_addr *addr,
 321                         u8 channel, u8 page, u8 cap);
 322         int (*assoc_resp)(struct net_device *dev,
 323                         struct ieee802154_addr *addr,
 324                         __le16 short_addr, u8 status);
 325         int (*disassoc_req)(struct net_device *dev,
 326                         struct ieee802154_addr *addr,
 327                         u8 reason);
 328         int (*start_req)(struct net_device *dev,
 329                         struct ieee802154_addr *addr,
 330                         u8 channel, u8 page, u8 bcn_ord, u8 sf_ord,
 331                         u8 pan_coord, u8 blx, u8 coord_realign);
 332         int (*scan_req)(struct net_device *dev,
 333                         u8 type, u32 channels, u8 page, u8 duration);
 334
 335         int (*set_mac_params)(struct net_device *dev,
 336                               const struct ieee802154_mac_params *params);
 337         void (*get_mac_params)(struct net_device *dev,
 338                                struct ieee802154_mac_params *params);
 339
 340         struct ieee802154_llsec_ops *llsec;
 341 };
 342
 343 static inline struct ieee802154_mlme_ops *
 344 ieee802154_mlme_ops(const struct net_device *dev)
 345 {
 346         return dev->ml_priv;
 347 }
 348
 349 #endif