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 <net/af_ieee802154.h>
  20 #include <linux/ieee802154.h>
  21 #include <linux/skbuff.h>
  22
  23 #include <net/cfg802154.h>
  24
  25 /* General MAC frame format:
  26  *  2 bytes: Frame Control
  27  *  1 byte:  Sequence Number
  28  * 20 bytes: Addressing fields
  29  * 14 bytes: Auxiliary Security Header
  30  */
  31 #define MAC802154_FRAME_HARD_HEADER_LEN         (2 + 1 + 20 + 14)
  32
  33 /* The following flags are used to indicate changed address settings from
  34  * the stack to the hardware.
  35  */
  36
  37 /* indicates that the Short Address changed */
  38 #define IEEE802154_AFILT_SADDR_CHANGED          0x00000001
  39 /* indicates that the IEEE Address changed */
  40 #define IEEE802154_AFILT_IEEEADDR_CHANGED       0x00000002
  41 /* indicates that the PAN ID changed */
  42 #define IEEE802154_AFILT_PANID_CHANGED          0x00000004
  43 /* indicates that PAN Coordinator status changed */
  44 #define IEEE802154_AFILT_PANC_CHANGED           0x00000008
  45
  46 struct ieee802154_hw_addr_filt {
  47         __le16  pan_id;         /* Each independent PAN selects a unique
  48                                  * identifier. This PAN id allows communication
  49                                  * between devices within a network using short
  50                                  * addresses and enables transmissions between
  51                                  * devices across independent networks.
  52                                  */
  53         __le16  short_addr;
  54         __le64  ieee_addr;
  55         u8      pan_coord;
  56 };
  57
  58 struct ieee802154_vif {
  59         int type;
  60
  61         /* must be last */
  62         u8 drv_priv[0] __aligned(sizeof(void *));
  63 };
  64
  65 struct ieee802154_hw {
  66         /* filled by the driver */
  67         int     extra_tx_headroom;
  68         u32     flags;
  69         struct  device *parent;
  70
  71         /* filled by mac802154 core */
  72         struct  ieee802154_hw_addr_filt hw_filt;
  73         void    *priv;
  74         struct  wpan_phy *phy;
  75         size_t vif_data_size;
  76 };
  77
  78 /* Checksum is in hardware and is omitted from a packet
  79  *
  80  * These following flags are used to indicate hardware capabilities to
  81  * the stack. Generally, flags here should have their meaning
  82  * done in a way that the simplest hardware doesn't need setting
  83  * any particular flags. There are some exceptions to this rule,
  84  * however, so you are advised to review these flags carefully.
  85  */
  86
  87 /* Indicates that xmitter will add FCS on it's own. */
  88 #define IEEE802154_HW_TX_OMIT_CKSUM     0x00000001
  89 /* Indicates that receiver will autorespond with ACK frames. */
  90 #define IEEE802154_HW_AACK              0x00000002
  91 /* Indicates that transceiver will support transmit power setting. */
  92 #define IEEE802154_HW_TXPOWER           0x00000004
  93 /* Indicates that transceiver will support listen before transmit. */
  94 #define IEEE802154_HW_LBT               0x00000008
  95 /* Indicates that transceiver will support cca mode setting. */
  96 #define IEEE802154_HW_CCA_MODE          0x00000010
  97 /* Indicates that transceiver will support cca ed level setting. */
  98 #define IEEE802154_HW_CCA_ED_LEVEL      0x00000020
  99 /* Indicates that transceiver will support csma (max_be, min_be, csma retries)
 100  * settings. */
 101 #define IEEE802154_HW_CSMA_PARAMS       0x00000040
 102 /* Indicates that transceiver will support ARET frame retries setting. */
 103 #define IEEE802154_HW_FRAME_RETRIES     0x00000080
 104 /* Indicates that transceiver will support hardware address filter setting. */
 105 #define IEEE802154_HW_AFILT             0x00000100
 106 /* Indicates that transceiver will support promiscuous mode setting. */
 107 #define IEEE802154_HW_PROMISCUOUS       0x00000200
 108 /* Indicates that receiver omits FCS. */
 109 #define IEEE802154_HW_RX_OMIT_CKSUM     0x00000400
 110 /* Indicates that receiver will not filter frames with bad checksum. */
 111 #define IEEE802154_HW_RX_DROP_BAD_CKSUM 0x00000800
 112
 113 /* Indicates that receiver omits FCS and xmitter will add FCS on it's own. */
 114 #define IEEE802154_HW_OMIT_CKSUM        (IEEE802154_HW_TX_OMIT_CKSUM | \
 115                                          IEEE802154_HW_RX_OMIT_CKSUM)
 116
 117 /* This groups the most common CSMA support fields into one. */
 118 #define IEEE802154_HW_CSMA              (IEEE802154_HW_CCA_MODE | \
 119                                          IEEE802154_HW_CCA_ED_LEVEL | \
 120                                          IEEE802154_HW_CSMA_PARAMS)
 121
 122 /* This groups the most common ARET support fields into one. */
 123 #define IEEE802154_HW_ARET              (IEEE802154_HW_CSMA | \
 124                                          IEEE802154_HW_FRAME_RETRIES)
 125
 126 /* struct ieee802154_ops - callbacks from mac802154 to the driver
 127  *
 128  * This structure contains various callbacks that the driver may
 129  * handle or, in some cases, must handle, for example to transmit
 130  * a frame.
 131  *
 132  * start: Handler that 802.15.4 module calls for device initialization.
 133  *        This function is called before the first interface is attached.
 134  *
 135  * stop:  Handler that 802.15.4 module calls for device cleanup.
 136  *        This function is called after the last interface is removed.
 137  *
 138  * xmit_sync:
 139  *        Handler that 802.15.4 module calls for each transmitted frame.
 140  *        skb cntains the buffer starting from the IEEE 802.15.4 header.
 141  *        The low-level driver should send the frame based on available
 142  *        configuration. This is called by a workqueue and useful for
 143  *        synchronous 802.15.4 drivers.
 144  *        This function should return zero or negative errno.
 145  *
 146  *        WARNING:
 147  *        This will be deprecated soon. We don't accept synced xmit callbacks
 148  *        drivers anymore.
 149  *
 150  * xmit_async:
 151  *        Handler that 802.15.4 module calls for each transmitted frame.
 152  *        skb cntains the buffer starting from the IEEE 802.15.4 header.
 153  *        The low-level driver should send the frame based on available
 154  *        configuration.
 155  *        This function should return zero or negative errno.
 156  *
 157  * ed:    Handler that 802.15.4 module calls for Energy Detection.
 158  *        This function should place the value for detected energy
 159  *        (usually device-dependant) in the level pointer and return
 160  *        either zero or negative errno. Called with pib_lock held.
 161  *
 162  * set_channel:
 163  *        Set radio for listening on specific channel.
 164  *        Set the device for listening on specified channel.
 165  *        Returns either zero, or negative errno. Called with pib_lock held.
 166  *
 167  * set_hw_addr_filt:
 168  *        Set radio for listening on specific address.
 169  *        Set the device for listening on specified address.
 170  *        Returns either zero, or negative errno.
 171  *
 172  * set_txpower:
 173  *        Set radio transmit power in dB. Called with pib_lock held.
 174  *        Returns either zero, or negative errno.
 175  *
 176  * set_lbt
 177  *        Enables or disables listen before talk on the device. Called with
 178  *        pib_lock held.
 179  *        Returns either zero, or negative errno.
 180  *
 181  * set_cca_mode
 182  *        Sets the CCA mode used by the device. Called with pib_lock held.
 183  *        Returns either zero, or negative errno.
 184  *
 185  * set_cca_ed_level
 186  *        Sets the CCA energy detection threshold in dBm. Called with pib_lock
 187  *        held.
 188  *        Returns either zero, or negative errno.
 189  *
 190  * set_csma_params
 191  *        Sets the CSMA parameter set for the PHY. Called with pib_lock held.
 192  *        Returns either zero, or negative errno.
 193  *
 194  * set_frame_retries
 195  *        Sets the retransmission attempt limit. Called with pib_lock held.
 196  *        Returns either zero, or negative errno.
 197  *
 198  * set_promiscuous_mode
 199  *        Enables or disable promiscuous mode.
 200  */
 201 struct ieee802154_ops {
 202         struct module   *owner;
 203         int             (*start)(struct ieee802154_hw *hw);
 204         void            (*stop)(struct ieee802154_hw *hw);
 205         int             (*xmit_sync)(struct ieee802154_hw *hw,
 206                                      struct sk_buff *skb);
 207         int             (*xmit_async)(struct ieee802154_hw *hw,
 208                                       struct sk_buff *skb);
 209         int             (*ed)(struct ieee802154_hw *hw, u8 *level);
 210         int             (*set_channel)(struct ieee802154_hw *hw, u8 page,
 211                                        u8 channel);
 212         int             (*set_hw_addr_filt)(struct ieee802154_hw *hw,
 213                                             struct ieee802154_hw_addr_filt *filt,
 214                                             unsigned long changed);
 215         int             (*set_txpower)(struct ieee802154_hw *hw, int db);
 216         int             (*set_lbt)(struct ieee802154_hw *hw, bool on);
 217         int             (*set_cca_mode)(struct ieee802154_hw *hw,
 218                                         const struct wpan_phy_cca *cca);
 219         int             (*set_cca_ed_level)(struct ieee802154_hw *hw,
 220                                             s32 level);
 221         int             (*set_csma_params)(struct ieee802154_hw *hw,
 222                                            u8 min_be, u8 max_be, u8 retries);
 223         int             (*set_frame_retries)(struct ieee802154_hw *hw,
 224                                              s8 retries);
 225         int             (*set_promiscuous_mode)(struct ieee802154_hw *hw,
 226                                                 const bool on);
 227 };
 228
 229 /**
 230  * ieee802154_be64_to_le64 - copies and convert be64 to le64
 231  * @le64_dst: le64 destination pointer
 232  * @be64_src: be64 source pointer
 233  */
 234 static inline void ieee802154_be64_to_le64(void *le64_dst, const void *be64_src)
 235 {
 236         __le64 tmp = (__force __le64)swab64p(be64_src);
 237
 238         memcpy(le64_dst, &tmp, IEEE802154_EXTENDED_ADDR_LEN);
 239 }
 240
 241 /**
 242  * ieee802154_le64_to_be64 - copies and convert le64 to be64
 243  * @be64_dst: be64 destination pointer
 244  * @le64_src: le64 source pointer
 245  */
 246 static inline void ieee802154_le64_to_be64(void *be64_dst, const void *le64_src)
 247 {
 248         __be64 tmp = (__force __be64)swab64p(le64_src);
 249
 250         memcpy(be64_dst, &tmp, IEEE802154_EXTENDED_ADDR_LEN);
 251 }
 252
 253 /* Basic interface to register ieee802154 hwice */
 254 struct ieee802154_hw *
 255 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops);
 256 void ieee802154_free_hw(struct ieee802154_hw *hw);
 257 int ieee802154_register_hw(struct ieee802154_hw *hw);
 258 void ieee802154_unregister_hw(struct ieee802154_hw *hw);
 259
 260 void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb);
 261 void ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb,
 262                            u8 lqi);
 263
 264 void ieee802154_wake_queue(struct ieee802154_hw *hw);
 265 void ieee802154_stop_queue(struct ieee802154_hw *hw);
 266 void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
 267                               bool ifs_handling);
 268
 269 #endif /* NET_MAC802154_H */