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 /* General MAC frame format:
  24  *  2 bytes: Frame Control
  25  *  1 byte:  Sequence Number
  26  * 20 bytes: Addressing fields
  27  * 14 bytes: Auxiliary Security Header
  28  */
  29 #define MAC802154_FRAME_HARD_HEADER_LEN         (2 + 1 + 20 + 14)
  30
  31 /* The following flags are used to indicate changed address settings from
  32  * the stack to the hardware.
  33  */
  34
  35 /* indicates that the Short Address changed */
  36 #define IEEE802154_AFILT_SADDR_CHANGED          0x00000001
  37 /* indicates that the IEEE Address changed */
  38 #define IEEE802154_AFILT_IEEEADDR_CHANGED       0x00000002
  39 /* indicates that the PAN ID changed */
  40 #define IEEE802154_AFILT_PANID_CHANGED          0x00000004
  41 /* indicates that PAN Coordinator status changed */
  42 #define IEEE802154_AFILT_PANC_CHANGED           0x00000008
  43
  44 struct ieee802154_hw_addr_filt {
  45         __le16  pan_id;         /* Each independent PAN selects a unique
  46                                  * identifier. This PAN id allows communication
  47                                  * between devices within a network using short
  48                                  * addresses and enables transmissions between
  49                                  * devices across independent networks.
  50                                  */
  51         __le16  short_addr;
  52         __le64  ieee_addr;
  53         u8      pan_coord;
  54 };
  55
  56 struct ieee802154_vif {
  57         int type;
  58
  59         /* must be last */
  60         u8 drv_priv[0] __aligned(sizeof(void *));
  61 };
  62
  63 struct ieee802154_hw {
  64         /* filled by the driver */
  65         int     extra_tx_headroom;
  66         u32     flags;
  67         struct  device *parent;
  68
  69         /* filled by mac802154 core */
  70         struct  ieee802154_hw_addr_filt hw_filt;
  71         void    *priv;
  72         struct  wpan_phy *phy;
  73         size_t vif_data_size;
  74 };
  75
  76 /* Checksum is in hardware and is omitted from a packet
  77  *
  78  * These following flags are used to indicate hardware capabilities to
  79  * the stack. Generally, flags here should have their meaning
  80  * done in a way that the simplest hardware doesn't need setting
  81  * any particular flags. There are some exceptions to this rule,
  82  * however, so you are advised to review these flags carefully.
  83  */
  84
  85 /* Indicates that xmitter will add FCS on it's own. */
  86 #define IEEE802154_HW_TX_OMIT_CKSUM     0x00000001
  87 /* Indicates that receiver will autorespond with ACK frames. */
  88 #define IEEE802154_HW_AACK              0x00000002
  89 /* Indicates that transceiver will support transmit power setting. */
  90 #define IEEE802154_HW_TXPOWER           0x00000004
  91 /* Indicates that transceiver will support listen before transmit. */
  92 #define IEEE802154_HW_LBT               0x00000008
  93 /* Indicates that transceiver will support cca mode setting. */
  94 #define IEEE802154_HW_CCA_MODE          0x00000010
  95 /* Indicates that transceiver will support cca ed level setting. */
  96 #define IEEE802154_HW_CCA_ED_LEVEL      0x00000020
  97 /* Indicates that transceiver will support csma (max_be, min_be, csma retries)
  98  * settings. */
  99 #define IEEE802154_HW_CSMA_PARAMS       0x00000040
 100 /* Indicates that transceiver will support ARET frame retries setting. */
 101 #define IEEE802154_HW_FRAME_RETRIES     0x00000080
 102 /* Indicates that transceiver will support hardware address filter setting. */
 103 #define IEEE802154_HW_AFILT             0x00000100
 104 /* Indicates that transceiver will support promiscuous mode setting. */
 105 #define IEEE802154_HW_PROMISCUOUS       0x00000200
 106 /* Indicates that receiver omits FCS. */
 107 #define IEEE802154_HW_RX_OMIT_CKSUM     0x00000400
 108 /* Indicates that receiver will not filter frames with bad checksum. */
 109 #define IEEE802154_HW_RX_DROP_BAD_CKSUM 0x00000800
 110
 111 /* Indicates that receiver omits FCS and xmitter will add FCS on it's own. */
 112 #define IEEE802154_HW_OMIT_CKSUM        (IEEE802154_HW_TX_OMIT_CKSUM | \
 113                                          IEEE802154_HW_RX_OMIT_CKSUM)
 114
 115 /* This groups the most common CSMA support fields into one. */
 116 #define IEEE802154_HW_CSMA              (IEEE802154_HW_CCA_MODE | \
 117                                          IEEE802154_HW_CCA_ED_LEVEL | \
 118                                          IEEE802154_HW_CSMA_PARAMS)
 119
 120 /* This groups the most common ARET support fields into one. */
 121 #define IEEE802154_HW_ARET              (IEEE802154_HW_CSMA | \
 122                                          IEEE802154_HW_FRAME_RETRIES)
 123
 124 /* struct ieee802154_ops - callbacks from mac802154 to the driver
 125  *
 126  * This structure contains various callbacks that the driver may
 127  * handle or, in some cases, must handle, for example to transmit
 128  * a frame.
 129  *
 130  * start: Handler that 802.15.4 module calls for device initialization.
 131  *        This function is called before the first interface is attached.
 132  *
 133  * stop:  Handler that 802.15.4 module calls for device cleanup.
 134  *        This function is called after the last interface is removed.
 135  *
 136  * xmit_sync:
 137  *        Handler that 802.15.4 module calls for each transmitted frame.
 138  *        skb cntains the buffer starting from the IEEE 802.15.4 header.
 139  *        The low-level driver should send the frame based on available
 140  *        configuration. This is called by a workqueue and useful for
 141  *        synchronous 802.15.4 drivers.
 142  *        This function should return zero or negative errno.
 143  *
 144  *        WARNING:
 145  *        This will be deprecated soon. We don't accept synced xmit callbacks
 146  *        drivers anymore.
 147  *
 148  * xmit_async:
 149  *        Handler that 802.15.4 module calls for each transmitted frame.
 150  *        skb cntains the buffer starting from the IEEE 802.15.4 header.
 151  *        The low-level driver should send the frame based on available
 152  *        configuration.
 153  *        This function should return zero or negative errno.
 154  *
 155  * ed:    Handler that 802.15.4 module calls for Energy Detection.
 156  *        This function should place the value for detected energy
 157  *        (usually device-dependant) in the level pointer and return
 158  *        either zero or negative errno. Called with pib_lock held.
 159  *
 160  * set_channel:
 161  *        Set radio for listening on specific channel.
 162  *        Set the device for listening on specified channel.
 163  *        Returns either zero, or negative errno. Called with pib_lock held.
 164  *
 165  * set_hw_addr_filt:
 166  *        Set radio for listening on specific address.
 167  *        Set the device for listening on specified address.
 168  *        Returns either zero, or negative errno.
 169  *
 170  * set_txpower:
 171  *        Set radio transmit power in dB. Called with pib_lock held.
 172  *        Returns either zero, or negative errno.
 173  *
 174  * set_lbt
 175  *        Enables or disables listen before talk on the device. Called with
 176  *        pib_lock held.
 177  *        Returns either zero, or negative errno.
 178  *
 179  * set_cca_mode
 180  *        Sets the CCA mode used by the device. Called with pib_lock held.
 181  *        Returns either zero, or negative errno.
 182  *
 183  * set_cca_ed_level
 184  *        Sets the CCA energy detection threshold in dBm. Called with pib_lock
 185  *        held.
 186  *        Returns either zero, or negative errno.
 187  *
 188  * set_csma_params
 189  *        Sets the CSMA parameter set for the PHY. Called with pib_lock held.
 190  *        Returns either zero, or negative errno.
 191  *
 192  * set_frame_retries
 193  *        Sets the retransmission attempt limit. Called with pib_lock held.
 194  *        Returns either zero, or negative errno.
 195  *
 196  * set_promiscuous_mode
 197  *        Enables or disable promiscuous mode.
 198  */
 199 struct ieee802154_ops {
 200         struct module   *owner;
 201         int             (*start)(struct ieee802154_hw *hw);
 202         void            (*stop)(struct ieee802154_hw *hw);
 203         int             (*xmit_sync)(struct ieee802154_hw *hw,
 204                                      struct sk_buff *skb);
 205         int             (*xmit_async)(struct ieee802154_hw *hw,
 206                                       struct sk_buff *skb);
 207         int             (*ed)(struct ieee802154_hw *hw, u8 *level);
 208         int             (*set_channel)(struct ieee802154_hw *hw, u8 page,
 209                                        u8 channel);
 210         int             (*set_hw_addr_filt)(struct ieee802154_hw *hw,
 211                                             struct ieee802154_hw_addr_filt *filt,
 212                                             unsigned long changed);
 213         int             (*set_txpower)(struct ieee802154_hw *hw, int db);
 214         int             (*set_lbt)(struct ieee802154_hw *hw, bool on);
 215         int             (*set_cca_mode)(struct ieee802154_hw *hw, u8 mode);
 216         int             (*set_cca_ed_level)(struct ieee802154_hw *hw,
 217                                             s32 level);
 218         int             (*set_csma_params)(struct ieee802154_hw *hw,
 219                                            u8 min_be, u8 max_be, u8 retries);
 220         int             (*set_frame_retries)(struct ieee802154_hw *hw,
 221                                              s8 retries);
 222         int             (*set_promiscuous_mode)(struct ieee802154_hw *hw,
 223                                                 const bool on);
 224 };
 225
 226 /**
 227  * ieee802154_netdev_to_extended_addr - convert big endian 64 byte void pointer to __le64
 228  * @dev_addr: big endian address pointer like netdevice dev_addr attribute
 229  */
 230 static inline __le64 ieee802154_netdev_to_extended_addr(const void *dev_addr)
 231 {
 232         return (__force __le64)swab64p(dev_addr);
 233 }
 234
 235 /**
 236  * ieee802154_le64_to_be64 - copies and convert le64 to be64
 237  * @be64_dst: be64 destination pointer
 238  * @le64_src: le64 source pointer
 239  */
 240 static inline void ieee802154_le64_to_be64(void *be64_dst, const void *le64_src)
 241 {
 242         __be64 tmp = (__force __be64)swab64p(le64_src);
 243
 244         memcpy(be64_dst, &tmp, IEEE802154_EXTENDED_ADDR_LEN);
 245 }
 246
 247 /* Basic interface to register ieee802154 hwice */
 248 struct ieee802154_hw *
 249 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops);
 250 void ieee802154_free_hw(struct ieee802154_hw *hw);
 251 int ieee802154_register_hw(struct ieee802154_hw *hw);
 252 void ieee802154_unregister_hw(struct ieee802154_hw *hw);
 253
 254 void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb);
 255 void ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb,
 256                            u8 lqi);
 257
 258 void ieee802154_wake_queue(struct ieee802154_hw *hw);
 259 void ieee802154_stop_queue(struct ieee802154_hw *hw);
 260 void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb);
 261
 262 #endif /* NET_MAC802154_H */