include/net/mac802154.h

   1 /*
   2  * IEEE802.15.4-2003 specification
   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  */
  16 #ifndef NET_MAC802154_H
  17 #define NET_MAC802154_H
  18
  19 #include <asm/unaligned.h>
  20 #include <net/af_ieee802154.h>
  21 #include <linux/ieee802154.h>
  22 #include <linux/skbuff.h>
  23
  24 #include <net/cfg802154.h>
  25
  26 /**
  27  * enum ieee802154_hw_addr_filt_flags - hardware address filtering flags
  28  *
  29  * The following flags are used to indicate changed address settings from
  30  * the stack to the hardware.
  31  *
  32  * @IEEE802154_AFILT_SADDR_CHANGED: Indicates that the short address will be
  33  *      change.
  34  *
  35  * @IEEE802154_AFILT_IEEEADDR_CHANGED: Indicates that the extended address
  36  *      will be change.
  37  *
  38  * @IEEE802154_AFILT_PANID_CHANGED: Indicates that the pan id will be change.
  39  *
  40  * @IEEE802154_AFILT_PANC_CHANGED: Indicates that the address filter will
  41  *      do frame address filtering as a pan coordinator.
  42  */
  43 enum ieee802154_hw_addr_filt_flags {
  44         IEEE802154_AFILT_SADDR_CHANGED          = BIT(0),
  45         IEEE802154_AFILT_IEEEADDR_CHANGED       = BIT(1),
  46         IEEE802154_AFILT_PANID_CHANGED          = BIT(2),
  47         IEEE802154_AFILT_PANC_CHANGED           = BIT(3),
  48 };
  49
  50 /**
  51  * struct ieee802154_hw_addr_filt - hardware address filtering settings
  52  *
  53  * @pan_id: pan_id which should be set to the hardware address filter.
  54  *
  55  * @short_addr: short_addr which should be set to the hardware address filter.
  56  *
  57  * @ieee_addr: extended address which should be set to the hardware address
  58  *      filter.
  59  *
  60  * @pan_coord: boolean if hardware filtering should be operate as coordinator.
  61  */
  62 struct ieee802154_hw_addr_filt {
  63         __le16  pan_id;
  64         __le16  short_addr;
  65         __le64  ieee_addr;
  66         bool    pan_coord;
  67 };
  68
  69 /**
  70  * struct ieee802154_hw - ieee802154 hardware
  71  *
  72  * @extra_tx_headroom: headroom to reserve in each transmit skb for use by the
  73  *      driver (e.g. for transmit headers.)
  74  *
  75  * @flags: hardware flags, see &enum ieee802154_hw_flags
  76  *
  77  * @parent: parent device of the hardware.
  78  *
  79  * @priv: pointer to private area that was allocated for driver use along with
  80  *      this structure.
  81  *
  82  * @phy: This points to the &struct wpan_phy allocated for this 802.15.4 PHY.
  83  */
  84 struct ieee802154_hw {
  85         /* filled by the driver */
  86         int     extra_tx_headroom;
  87         u32     flags;
  88         struct  device *parent;
  89         void    *priv;
  90
  91         /* filled by mac802154 core */
  92         struct  wpan_phy *phy;
  93 };
  94
  95 /**
  96  * enum ieee802154_hw_flags - hardware flags
  97  *
  98  * These flags are used to indicate hardware capabilities to
  99  * the stack. Generally, flags here should have their meaning
 100  * done in a way that the simplest hardware doesn't need setting
 101  * any particular flags. There are some exceptions to this rule,
 102  * however, so you are advised to review these flags carefully.
 103  *
 104  * @IEEE802154_HW_TX_OMIT_CKSUM: Indicates that xmitter will add FCS on it's
 105  *      own.
 106  *
 107  * @IEEE802154_HW_LBT: Indicates that transceiver will support listen before
 108  *      transmit.
 109  *
 110  * @IEEE802154_HW_CSMA_PARAMS: Indicates that transceiver will support csma
 111  *      parameters (max_be, min_be, backoff exponents).
 112  *
 113  * @IEEE802154_HW_FRAME_RETRIES: Indicates that transceiver will support ARET
 114  *      frame retries setting.
 115  *
 116  * @IEEE802154_HW_AFILT: Indicates that transceiver will support hardware
 117  *      address filter setting.
 118  *
 119  * @IEEE802154_HW_PROMISCUOUS: Indicates that transceiver will support
 120  *      promiscuous mode setting.
 121  *
 122  * @IEEE802154_HW_RX_OMIT_CKSUM: Indicates that receiver omits FCS.
 123  *
 124  * @IEEE802154_HW_RX_DROP_BAD_CKSUM: Indicates that receiver will not filter
 125  *      frames with bad checksum.
 126  */
 127 enum ieee802154_hw_flags {
 128         IEEE802154_HW_TX_OMIT_CKSUM     = BIT(0),
 129         IEEE802154_HW_LBT               = BIT(1),
 130         IEEE802154_HW_CSMA_PARAMS       = BIT(2),
 131         IEEE802154_HW_FRAME_RETRIES     = BIT(3),
 132         IEEE802154_HW_AFILT             = BIT(4),
 133         IEEE802154_HW_PROMISCUOUS       = BIT(5),
 134         IEEE802154_HW_RX_OMIT_CKSUM     = BIT(6),
 135         IEEE802154_HW_RX_DROP_BAD_CKSUM = BIT(7),
 136 };
 137
 138 /* Indicates that receiver omits FCS and xmitter will add FCS on it's own. */
 139 #define IEEE802154_HW_OMIT_CKSUM        (IEEE802154_HW_TX_OMIT_CKSUM | \
 140                                          IEEE802154_HW_RX_OMIT_CKSUM)
 141
 142 /* struct ieee802154_ops - callbacks from mac802154 to the driver
 143  *
 144  * This structure contains various callbacks that the driver may
 145  * handle or, in some cases, must handle, for example to transmit
 146  * a frame.
 147  *
 148  * start: Handler that 802.15.4 module calls for device initialization.
 149  *        This function is called before the first interface is attached.
 150  *
 151  * stop:  Handler that 802.15.4 module calls for device cleanup.
 152  *        This function is called after the last interface is removed.
 153  *
 154  * xmit_sync:
 155  *        Handler that 802.15.4 module calls for each transmitted frame.
 156  *        skb cntains the buffer starting from the IEEE 802.15.4 header.
 157  *        The low-level driver should send the frame based on available
 158  *        configuration. This is called by a workqueue and useful for
 159  *        synchronous 802.15.4 drivers.
 160  *        This function should return zero or negative errno.
 161  *
 162  *        WARNING:
 163  *        This will be deprecated soon. We don't accept synced xmit callbacks
 164  *        drivers anymore.
 165  *
 166  * xmit_async:
 167  *        Handler that 802.15.4 module calls for each transmitted frame.
 168  *        skb cntains the buffer starting from the IEEE 802.15.4 header.
 169  *        The low-level driver should send the frame based on available
 170  *        configuration.
 171  *        This function should return zero or negative errno.
 172  *
 173  * ed:    Handler that 802.15.4 module calls for Energy Detection.
 174  *        This function should place the value for detected energy
 175  *        (usually device-dependant) in the level pointer and return
 176  *        either zero or negative errno. Called with pib_lock held.
 177  *
 178  * set_channel:
 179  *        Set radio for listening on specific channel.
 180  *        Set the device for listening on specified channel.
 181  *        Returns either zero, or negative errno. Called with pib_lock held.
 182  *
 183  * set_hw_addr_filt:
 184  *        Set radio for listening on specific address.
 185  *        Set the device for listening on specified address.
 186  *        Returns either zero, or negative errno.
 187  *
 188  * set_txpower:
 189  *        Set radio transmit power in mBm. Called with pib_lock held.
 190  *        Returns either zero, or negative errno.
 191  *
 192  * set_lbt
 193  *        Enables or disables listen before talk on the device. Called with
 194  *        pib_lock held.
 195  *        Returns either zero, or negative errno.
 196  *
 197  * set_cca_mode
 198  *        Sets the CCA mode used by the device. Called with pib_lock held.
 199  *        Returns either zero, or negative errno.
 200  *
 201  * set_cca_ed_level
 202  *        Sets the CCA energy detection threshold in mBm. Called with pib_lock
 203  *        held.
 204  *        Returns either zero, or negative errno.
 205  *
 206  * set_csma_params
 207  *        Sets the CSMA parameter set for the PHY. Called with pib_lock held.
 208  *        Returns either zero, or negative errno.
 209  *
 210  * set_frame_retries
 211  *        Sets the retransmission attempt limit. Called with pib_lock held.
 212  *        Returns either zero, or negative errno.
 213  *
 214  * set_promiscuous_mode
 215  *        Enables or disable promiscuous mode.
 216  */
 217 struct ieee802154_ops {
 218         struct module   *owner;
 219         int             (*start)(struct ieee802154_hw *hw);
 220         void            (*stop)(struct ieee802154_hw *hw);
 221         int             (*xmit_sync)(struct ieee802154_hw *hw,
 222                                      struct sk_buff *skb);
 223         int             (*xmit_async)(struct ieee802154_hw *hw,
 224                                       struct sk_buff *skb);
 225         int             (*ed)(struct ieee802154_hw *hw, u8 *level);
 226         int             (*set_channel)(struct ieee802154_hw *hw, u8 page,
 227                                        u8 channel);
 228         int             (*set_hw_addr_filt)(struct ieee802154_hw *hw,
 229                                             struct ieee802154_hw_addr_filt *filt,
 230                                             unsigned long changed);
 231         int             (*set_txpower)(struct ieee802154_hw *hw, s32 mbm);
 232         int             (*set_lbt)(struct ieee802154_hw *hw, bool on);
 233         int             (*set_cca_mode)(struct ieee802154_hw *hw,
 234                                         const struct wpan_phy_cca *cca);
 235         int             (*set_cca_ed_level)(struct ieee802154_hw *hw, s32 mbm);
 236         int             (*set_csma_params)(struct ieee802154_hw *hw,
 237                                            u8 min_be, u8 max_be, u8 retries);
 238         int             (*set_frame_retries)(struct ieee802154_hw *hw,
 239                                              s8 retries);
 240         int             (*set_promiscuous_mode)(struct ieee802154_hw *hw,
 241                                                 const bool on);
 242 };
 243
 244 /**
 245  * ieee802154_get_fc_from_skb - get the frame control field from an skb
 246  * @skb: skb where the frame control field will be get from
 247  */
 248 static inline __le16 ieee802154_get_fc_from_skb(const struct sk_buff *skb)
 249 {
 250         __le16 fc;
 251
 252         /* check if we can fc at skb_mac_header of sk buffer */
 253         if (WARN_ON(!skb_mac_header_was_set(skb) ||
 254                     (skb_tail_pointer(skb) -
 255                      skb_mac_header(skb)) < IEEE802154_FC_LEN))
 256                 return cpu_to_le16(0);
 257
 258         memcpy(&fc, skb_mac_header(skb), IEEE802154_FC_LEN);
 259         return fc;
 260 }
 261
 262 /**
 263  * ieee802154_skb_dst_pan - get the pointer to destination pan field
 264  * @fc: mac header frame control field
 265  * @skb: skb where the destination pan pointer will be get from
 266  */
 267 static inline unsigned char *ieee802154_skb_dst_pan(__le16 fc,
 268                                                     const struct sk_buff *skb)
 269 {
 270         unsigned char *dst_pan;
 271
 272         switch (ieee802154_daddr_mode(fc)) {
 273         case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
 274                 dst_pan = NULL;
 275                 break;
 276         case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
 277         case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
 278                 dst_pan = skb_mac_header(skb) +
 279                           IEEE802154_FC_LEN +
 280                           IEEE802154_SEQ_LEN;
 281                 break;
 282         default:
 283                 WARN_ONCE(1, "invalid addr mode detected");
 284                 dst_pan = NULL;
 285                 break;
 286         }
 287
 288         return dst_pan;
 289 }
 290
 291 /**
 292  * ieee802154_skb_src_pan - get the pointer to source pan field
 293  * @fc: mac header frame control field
 294  * @skb: skb where the source pan pointer will be get from
 295  */
 296 static inline unsigned char *ieee802154_skb_src_pan(__le16 fc,
 297                                                     const struct sk_buff *skb)
 298 {
 299         unsigned char *src_pan;
 300
 301         switch (ieee802154_saddr_mode(fc)) {
 302         case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
 303                 src_pan = NULL;
 304                 break;
 305         case cpu_to_le16(IEEE802154_FCTL_SADDR_SHORT):
 306         case cpu_to_le16(IEEE802154_FCTL_SADDR_EXTENDED):
 307                 /* if intra-pan and source addr mode is non none,
 308                  * then source pan id is equal destination pan id.
 309                  */
 310                 if (ieee802154_is_intra_pan(fc)) {
 311                         src_pan = ieee802154_skb_dst_pan(fc, skb);
 312                         break;
 313                 }
 314
 315                 switch (ieee802154_daddr_mode(fc)) {
 316                 case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
 317                         src_pan = skb_mac_header(skb) +
 318                                   IEEE802154_FC_LEN +
 319                                   IEEE802154_SEQ_LEN;
 320                         break;
 321                 case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
 322                         src_pan = skb_mac_header(skb) +
 323                                   IEEE802154_FC_LEN +
 324                                   IEEE802154_SEQ_LEN +
 325                                   IEEE802154_PAN_ID_LEN +
 326                                   IEEE802154_SHORT_ADDR_LEN;
 327                         break;
 328                 case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
 329                         src_pan = skb_mac_header(skb) +
 330                                   IEEE802154_FC_LEN +
 331                                   IEEE802154_SEQ_LEN +
 332                                   IEEE802154_PAN_ID_LEN +
 333                                   IEEE802154_EXTENDED_ADDR_LEN;
 334                         break;
 335                 default:
 336                         WARN_ONCE(1, "invalid addr mode detected");
 337                         src_pan = NULL;
 338                         break;
 339                 }
 340                 break;
 341         default:
 342                 WARN_ONCE(1, "invalid addr mode detected");
 343                 src_pan = NULL;
 344                 break;
 345         }
 346
 347         return src_pan;
 348 }
 349
 350 /**
 351  * ieee802154_skb_is_intra_pan_addressing - checks whenever the mac addressing
 352  *      is an intra pan communication
 353  * @fc: mac header frame control field
 354  * @skb: skb where the source and destination pan should be get from
 355  */
 356 static inline bool ieee802154_skb_is_intra_pan_addressing(__le16 fc,
 357                                                           const struct sk_buff *skb)
 358 {
 359         unsigned char *dst_pan = ieee802154_skb_dst_pan(fc, skb),
 360                       *src_pan = ieee802154_skb_src_pan(fc, skb);
 361
 362         /* if one is NULL is no intra pan addressing */
 363         if (!dst_pan || !src_pan)
 364                 return false;
 365
 366         return !memcmp(dst_pan, src_pan, IEEE802154_PAN_ID_LEN);
 367 }
 368
 369 /**
 370  * ieee802154_be64_to_le64 - copies and convert be64 to le64
 371  * @le64_dst: le64 destination pointer
 372  * @be64_src: be64 source pointer
 373  */
 374 static inline void ieee802154_be64_to_le64(void *le64_dst, const void *be64_src)
 375 {
 376         put_unaligned_le64(get_unaligned_be64(be64_src), le64_dst);
 377 }
 378
 379 /**
 380  * ieee802154_le64_to_be64 - copies and convert le64 to be64
 381  * @be64_dst: be64 destination pointer
 382  * @le64_src: le64 source pointer
 383  */
 384 static inline void ieee802154_le64_to_be64(void *be64_dst, const void *le64_src)
 385 {
 386         put_unaligned_be64(get_unaligned_le64(le64_src), be64_dst);
 387 }
 388
 389 /**
 390  * ieee802154_le16_to_be16 - copies and convert le16 to be16
 391  * @be16_dst: be16 destination pointer
 392  * @le16_src: le16 source pointer
 393  */
 394 static inline void ieee802154_le16_to_be16(void *be16_dst, const void *le16_src)
 395 {
 396         put_unaligned_be16(get_unaligned_le16(le16_src), be16_dst);
 397 }
 398
 399 /**
 400  * ieee802154_be16_to_le16 - copies and convert be16 to le16
 401  * @le16_dst: le16 destination pointer
 402  * @be16_src: be16 source pointer
 403  */
 404 static inline void ieee802154_be16_to_le16(void *le16_dst, const void *be16_src)
 405 {
 406         put_unaligned_le16(get_unaligned_be16(be16_src), le16_dst);
 407 }
 408
 409 /**
 410  * ieee802154_alloc_hw - Allocate a new hardware device
 411  *
 412  * This must be called once for each hardware device. The returned pointer
 413  * must be used to refer to this device when calling other functions.
 414  * mac802154 allocates a private data area for the driver pointed to by
 415  * @priv in &struct ieee802154_hw, the size of this area is given as
 416  * @priv_data_len.
 417  *
 418  * @priv_data_len: length of private data
 419  * @ops: callbacks for this device
 420  *
 421  * Return: A pointer to the new hardware device, or %NULL on error.
 422  */
 423 struct ieee802154_hw *
 424 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops);
 425
 426 /**
 427  * ieee802154_free_hw - free hardware descriptor
 428  *
 429  * This function frees everything that was allocated, including the
 430  * private data for the driver. You must call ieee802154_unregister_hw()
 431  * before calling this function.
 432  *
 433  * @hw: the hardware to free
 434  */
 435 void ieee802154_free_hw(struct ieee802154_hw *hw);
 436
 437 /**
 438  * ieee802154_register_hw - Register hardware device
 439  *
 440  * You must call this function before any other functions in
 441  * mac802154. Note that before a hardware can be registered, you
 442  * need to fill the contained wpan_phy's information.
 443  *
 444  * @hw: the device to register as returned by ieee802154_alloc_hw()
 445  *
 446  * Return: 0 on success. An error code otherwise.
 447  */
 448 int ieee802154_register_hw(struct ieee802154_hw *hw);
 449
 450 /**
 451  * ieee802154_unregister_hw - Unregister a hardware device
 452  *
 453  * This function instructs mac802154 to free allocated resources
 454  * and unregister netdevices from the networking subsystem.
 455  *
 456  * @hw: the hardware to unregister
 457  */
 458 void ieee802154_unregister_hw(struct ieee802154_hw *hw);
 459
 460 /**
 461  * ieee802154_rx_irqsafe - receive frame
 462  *
 463  * Like ieee802154_rx() but can be called in IRQ context
 464  * (internally defers to a tasklet.)
 465  *
 466  * @hw: the hardware this frame came in on
 467  * @skb: the buffer to receive, owned by mac802154 after this call
 468  * @lqi: link quality indicator
 469  */
 470 void ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb,
 471                            u8 lqi);
 472 /**
 473  * ieee802154_wake_queue - wake ieee802154 queue
 474  * @hw: pointer as obtained from ieee802154_alloc_hw().
 475  *
 476  * Drivers should use this function instead of netif_wake_queue.
 477  */
 478 void ieee802154_wake_queue(struct ieee802154_hw *hw);
 479
 480 /**
 481  * ieee802154_stop_queue - stop ieee802154 queue
 482  * @hw: pointer as obtained from ieee802154_alloc_hw().
 483  *
 484  * Drivers should use this function instead of netif_stop_queue.
 485  */
 486 void ieee802154_stop_queue(struct ieee802154_hw *hw);
 487
 488 /**
 489  * ieee802154_xmit_complete - frame transmission complete
 490  *
 491  * @hw: pointer as obtained from ieee802154_alloc_hw().
 492  * @skb: buffer for transmission
 493  * @ifs_handling: indicate interframe space handling
 494  */
 495 void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
 496                               bool ifs_handling);
 497
 498 #endif /* NET_MAC802154_H */