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  * 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  * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
  21  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  22  * Maxim Osipov <maxim.osipov@siemens.com>
  23  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  24  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  25  */
  26
  27 #ifndef IEEE802154_NETDEVICE_H
  28 #define IEEE802154_NETDEVICE_H
  29
  30 #include <net/af_ieee802154.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/skbuff.h>
  33
  34 struct ieee802154_sechdr {
  35 #if defined(__LITTLE_ENDIAN_BITFIELD)
  36         u8 level:3,
  37            key_id_mode:2,
  38            reserved:3;
  39 #elif defined(__BIG_ENDIAN_BITFIELD)
  40         u8 reserved:3,
  41            key_id_mode:2,
  42            level:3;
  43 #else
  44 #error  "Please fix <asm/byteorder.h>"
  45 #endif
  46         u8 key_id;
  47         __le32 frame_counter;
  48         union {
  49                 __le32 short_src;
  50                 __le64 extended_src;
  51         };
  52 };
  53
  54 struct ieee802154_addr {
  55         u8 mode;
  56         __le16 pan_id;
  57         union {
  58                 __le16 short_addr;
  59                 __le64 extended_addr;
  60         };
  61 };
  62
  63 struct ieee802154_hdr_fc {
  64 #if defined(__LITTLE_ENDIAN_BITFIELD)
  65         u16 type:3,
  66             security_enabled:1,
  67             frame_pending:1,
  68             ack_request:1,
  69             intra_pan:1,
  70             reserved:3,
  71             dest_addr_mode:2,
  72             version:2,
  73             source_addr_mode:2;
  74 #elif defined(__BIG_ENDIAN_BITFIELD)
  75         u16 reserved:1,
  76             intra_pan:1,
  77             ack_request:1,
  78             frame_pending:1,
  79             security_enabled:1,
  80             type:3,
  81             source_addr_mode:2,
  82             version:2,
  83             dest_addr_mode:2,
  84             reserved2:2;
  85 #else
  86 #error  "Please fix <asm/byteorder.h>"
  87 #endif
  88 };
  89
  90 struct ieee802154_hdr {
  91         struct ieee802154_hdr_fc fc;
  92         u8 seq;
  93         struct ieee802154_addr source;
  94         struct ieee802154_addr dest;
  95         struct ieee802154_sechdr sec;
  96 };
  97
  98 /* pushes hdr onto the skb. fields of hdr->fc that can be calculated from
  99  * the contents of hdr will be, and the actual value of those bits in
 100  * hdr->fc will be ignored. this includes the INTRA_PAN bit and the frame
 101  * version, if SECEN is set.
 102  */
 103 int ieee802154_hdr_push(struct sk_buff *skb, const struct ieee802154_hdr *hdr);
 104
 105 /* pulls the entire 802.15.4 header off of the skb, including the security
 106  * header, and performs pan id decompression
 107  */
 108 int ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr);
 109
 110 /* parses the frame control, sequence number of address fields in a given skb
 111  * and stores them into hdr, performing pan id decompression and length checks
 112  * to be suitable for use in header_ops.parse
 113  */
 114 int ieee802154_hdr_peek_addrs(const struct sk_buff *skb,
 115                               struct ieee802154_hdr *hdr);
 116
 117 static inline int ieee802154_hdr_length(struct sk_buff *skb)
 118 {
 119         struct ieee802154_hdr hdr;
 120         int len = ieee802154_hdr_pull(skb, &hdr);
 121
 122         if (len > 0)
 123                 skb_push(skb, len);
 124
 125         return len;
 126 }
 127
 128 static inline bool ieee802154_addr_equal(const struct ieee802154_addr *a1,
 129                                          const struct ieee802154_addr *a2)
 130 {
 131         if (a1->pan_id != a2->pan_id || a1->mode != a2->mode)
 132                 return false;
 133
 134         if ((a1->mode == IEEE802154_ADDR_LONG &&
 135              a1->extended_addr != a2->extended_addr) ||
 136             (a1->mode == IEEE802154_ADDR_SHORT &&
 137              a1->short_addr != a2->short_addr))
 138                 return false;
 139
 140         return true;
 141 }
 142
 143 static inline __le64 ieee802154_devaddr_from_raw(const void *raw)
 144 {
 145         u64 temp;
 146
 147         memcpy(&temp, raw, IEEE802154_ADDR_LEN);
 148         return (__force __le64)swab64(temp);
 149 }
 150
 151 static inline void ieee802154_devaddr_to_raw(void *raw, __le64 addr)
 152 {
 153         u64 temp = swab64((__force u64)addr);
 154
 155         memcpy(raw, &temp, IEEE802154_ADDR_LEN);
 156 }
 157
 158 static inline void ieee802154_addr_from_sa(struct ieee802154_addr *a,
 159                                            const struct ieee802154_addr_sa *sa)
 160 {
 161         a->mode = sa->addr_type;
 162         a->pan_id = cpu_to_le16(sa->pan_id);
 163
 164         switch (a->mode) {
 165         case IEEE802154_ADDR_SHORT:
 166                 a->short_addr = cpu_to_le16(sa->short_addr);
 167                 break;
 168         case IEEE802154_ADDR_LONG:
 169                 a->extended_addr = ieee802154_devaddr_from_raw(sa->hwaddr);
 170                 break;
 171         }
 172 }
 173
 174 static inline void ieee802154_addr_to_sa(struct ieee802154_addr_sa *sa,
 175                                          const struct ieee802154_addr *a)
 176 {
 177         sa->addr_type = a->mode;
 178         sa->pan_id = le16_to_cpu(a->pan_id);
 179
 180         switch (a->mode) {
 181         case IEEE802154_ADDR_SHORT:
 182                 sa->short_addr = le16_to_cpu(a->short_addr);
 183                 break;
 184         case IEEE802154_ADDR_LONG:
 185                 ieee802154_devaddr_to_raw(sa->hwaddr, a->extended_addr);
 186                 break;
 187         }
 188 }
 189
 190 /*
 191  * A control block of skb passed between the ARPHRD_IEEE802154 device
 192  * and other stack parts.
 193  */
 194 struct ieee802154_mac_cb {
 195         u8 lqi;
 196         u8 flags;
 197         u8 seq;
 198         struct ieee802154_addr source;
 199         struct ieee802154_addr dest;
 200 };
 201
 202 static inline struct ieee802154_mac_cb *mac_cb(struct sk_buff *skb)
 203 {
 204         return (struct ieee802154_mac_cb *)skb->cb;
 205 }
 206
 207 #define MAC_CB_FLAG_TYPEMASK            ((1 << 3) - 1)
 208
 209 #define MAC_CB_FLAG_ACKREQ              (1 << 3)
 210 #define MAC_CB_FLAG_SECEN               (1 << 4)
 211
 212 static inline bool mac_cb_is_ackreq(struct sk_buff *skb)
 213 {
 214         return mac_cb(skb)->flags & MAC_CB_FLAG_ACKREQ;
 215 }
 216
 217 static inline bool mac_cb_is_secen(struct sk_buff *skb)
 218 {
 219         return mac_cb(skb)->flags & MAC_CB_FLAG_SECEN;
 220 }
 221
 222 static inline int mac_cb_type(struct sk_buff *skb)
 223 {
 224         return mac_cb(skb)->flags & MAC_CB_FLAG_TYPEMASK;
 225 }
 226
 227 #define IEEE802154_MAC_SCAN_ED          0
 228 #define IEEE802154_MAC_SCAN_ACTIVE      1
 229 #define IEEE802154_MAC_SCAN_PASSIVE     2
 230 #define IEEE802154_MAC_SCAN_ORPHAN      3
 231
 232 struct ieee802154_mac_params {
 233         s8 transmit_power;
 234         u8 min_be;
 235         u8 max_be;
 236         u8 csma_retries;
 237         s8 frame_retries;
 238
 239         bool lbt;
 240         u8 cca_mode;
 241         s32 cca_ed_level;
 242 };
 243
 244 struct wpan_phy;
 245 /*
 246  * This should be located at net_device->ml_priv
 247  *
 248  * get_phy should increment the reference counting on returned phy.
 249  * Use wpan_wpy_put to put that reference.
 250  */
 251 struct ieee802154_mlme_ops {
 252         /* The following fields are optional (can be NULL). */
 253
 254         int (*assoc_req)(struct net_device *dev,
 255                         struct ieee802154_addr *addr,
 256                         u8 channel, u8 page, u8 cap);
 257         int (*assoc_resp)(struct net_device *dev,
 258                         struct ieee802154_addr *addr,
 259                         __le16 short_addr, u8 status);
 260         int (*disassoc_req)(struct net_device *dev,
 261                         struct ieee802154_addr *addr,
 262                         u8 reason);
 263         int (*start_req)(struct net_device *dev,
 264                         struct ieee802154_addr *addr,
 265                         u8 channel, u8 page, u8 bcn_ord, u8 sf_ord,
 266                         u8 pan_coord, u8 blx, u8 coord_realign);
 267         int (*scan_req)(struct net_device *dev,
 268                         u8 type, u32 channels, u8 page, u8 duration);
 269
 270         int (*set_mac_params)(struct net_device *dev,
 271                               const struct ieee802154_mac_params *params);
 272         void (*get_mac_params)(struct net_device *dev,
 273                                struct ieee802154_mac_params *params);
 274
 275         /* The fields below are required. */
 276
 277         struct wpan_phy *(*get_phy)(const struct net_device *dev);
 278
 279         /*
 280          * FIXME: these should become the part of PIB/MIB interface.
 281          * However we still don't have IB interface of any kind
 282          */
 283         __le16 (*get_pan_id)(const struct net_device *dev);
 284         __le16 (*get_short_addr)(const struct net_device *dev);
 285         u8 (*get_dsn)(const struct net_device *dev);
 286 };
 287
 288 /* The IEEE 802.15.4 standard defines 2 type of the devices:
 289  * - FFD - full functionality device
 290  * - RFD - reduce functionality device
 291  *
 292  * So 2 sets of mlme operations are needed
 293  */
 294 struct ieee802154_reduced_mlme_ops {
 295         struct wpan_phy *(*get_phy)(const struct net_device *dev);
 296 };
 297
 298 static inline struct ieee802154_mlme_ops *
 299 ieee802154_mlme_ops(const struct net_device *dev)
 300 {
 301         return dev->ml_priv;
 302 }
 303
 304 static inline struct ieee802154_reduced_mlme_ops *
 305 ieee802154_reduced_mlme_ops(const struct net_device *dev)
 306 {
 307         return dev->ml_priv;
 308 }
 309
 310 #endif