mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 19:01:37 +00:00
94b4f6c21c
This patch provides a set of structures to represent 802.15.4 MAC headers, and a set of operations to push/pull/peek these structs from skbs. We cannot simply pointer-cast the skb MAC header pointer to these structs, because 802.15.4 headers are wildly variable - depending on the first three bytes, virtually all other fields of the header may be present or not, and be present with different lengths. The new header creation/parsing routines also support 802.15.4 security headers, which are currently not supported by the mac802154 implementation of the protocol. Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> Signed-off-by: David S. Miller <davem@davemloft.net>
180 lines
6.3 KiB
C
180 lines
6.3 KiB
C
/*
|
|
* IEEE802.15.4-2003 specification
|
|
*
|
|
* Copyright (C) 2007-2012 Siemens AG
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
#ifndef NET_MAC802154_H
|
|
#define NET_MAC802154_H
|
|
|
|
#include <net/af_ieee802154.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
/* General MAC frame format:
|
|
* 2 bytes: Frame Control
|
|
* 1 byte: Sequence Number
|
|
* 20 bytes: Addressing fields
|
|
* 14 bytes: Auxiliary Security Header
|
|
*/
|
|
#define MAC802154_FRAME_HARD_HEADER_LEN (2 + 1 + 20 + 14)
|
|
|
|
/* The following flags are used to indicate changed address settings from
|
|
* the stack to the hardware.
|
|
*/
|
|
|
|
/* indicates that the Short Address changed */
|
|
#define IEEE802515_AFILT_SADDR_CHANGED 0x00000001
|
|
/* indicates that the IEEE Address changed */
|
|
#define IEEE802515_AFILT_IEEEADDR_CHANGED 0x00000002
|
|
/* indicates that the PAN ID changed */
|
|
#define IEEE802515_AFILT_PANID_CHANGED 0x00000004
|
|
/* indicates that PAN Coordinator status changed */
|
|
#define IEEE802515_AFILT_PANC_CHANGED 0x00000008
|
|
|
|
struct ieee802154_hw_addr_filt {
|
|
__le16 pan_id; /* Each independent PAN selects a unique
|
|
* identifier. This PAN id allows communication
|
|
* between devices within a network using short
|
|
* addresses and enables transmissions between
|
|
* devices across independent networks.
|
|
*/
|
|
__le16 short_addr;
|
|
__le64 ieee_addr;
|
|
u8 pan_coord;
|
|
};
|
|
|
|
struct ieee802154_dev {
|
|
/* filled by the driver */
|
|
int extra_tx_headroom;
|
|
u32 flags;
|
|
struct device *parent;
|
|
|
|
/* filled by mac802154 core */
|
|
struct ieee802154_hw_addr_filt hw_filt;
|
|
void *priv;
|
|
struct wpan_phy *phy;
|
|
};
|
|
|
|
/* Checksum is in hardware and is omitted from a packet
|
|
*
|
|
* These following flags are used to indicate hardware capabilities to
|
|
* the stack. Generally, flags here should have their meaning
|
|
* done in a way that the simplest hardware doesn't need setting
|
|
* any particular flags. There are some exceptions to this rule,
|
|
* however, so you are advised to review these flags carefully.
|
|
*/
|
|
|
|
/* Indicates that receiver omits FCS and xmitter will add FCS on it's own. */
|
|
#define IEEE802154_HW_OMIT_CKSUM 0x00000001
|
|
/* Indicates that receiver will autorespond with ACK frames. */
|
|
#define IEEE802154_HW_AACK 0x00000002
|
|
|
|
/* struct ieee802154_ops - callbacks from mac802154 to the driver
|
|
*
|
|
* This structure contains various callbacks that the driver may
|
|
* handle or, in some cases, must handle, for example to transmit
|
|
* a frame.
|
|
*
|
|
* start: Handler that 802.15.4 module calls for device initialization.
|
|
* This function is called before the first interface is attached.
|
|
*
|
|
* stop: Handler that 802.15.4 module calls for device cleanup.
|
|
* This function is called after the last interface is removed.
|
|
*
|
|
* xmit: Handler that 802.15.4 module calls for each transmitted frame.
|
|
* skb cntains the buffer starting from the IEEE 802.15.4 header.
|
|
* The low-level driver should send the frame based on available
|
|
* configuration.
|
|
* This function should return zero or negative errno. Called with
|
|
* pib_lock held.
|
|
*
|
|
* ed: Handler that 802.15.4 module calls for Energy Detection.
|
|
* This function should place the value for detected energy
|
|
* (usually device-dependant) in the level pointer and return
|
|
* either zero or negative errno. Called with pib_lock held.
|
|
*
|
|
* set_channel:
|
|
* Set radio for listening on specific channel.
|
|
* Set the device for listening on specified channel.
|
|
* Returns either zero, or negative errno. Called with pib_lock held.
|
|
*
|
|
* set_hw_addr_filt:
|
|
* Set radio for listening on specific address.
|
|
* Set the device for listening on specified address.
|
|
* Returns either zero, or negative errno.
|
|
*
|
|
* set_txpower:
|
|
* Set radio transmit power in dB. Called with pib_lock held.
|
|
* Returns either zero, or negative errno.
|
|
*
|
|
* set_lbt
|
|
* Enables or disables listen before talk on the device. Called with
|
|
* pib_lock held.
|
|
* Returns either zero, or negative errno.
|
|
*
|
|
* set_cca_mode
|
|
* Sets the CCA mode used by the device. Called with pib_lock held.
|
|
* Returns either zero, or negative errno.
|
|
*
|
|
* set_cca_ed_level
|
|
* Sets the CCA energy detection threshold in dBm. Called with pib_lock
|
|
* held.
|
|
* Returns either zero, or negative errno.
|
|
*
|
|
* set_csma_params
|
|
* Sets the CSMA parameter set for the PHY. Called with pib_lock held.
|
|
* Returns either zero, or negative errno.
|
|
*
|
|
* set_frame_retries
|
|
* Sets the retransmission attempt limit. Called with pib_lock held.
|
|
* Returns either zero, or negative errno.
|
|
*/
|
|
struct ieee802154_ops {
|
|
struct module *owner;
|
|
int (*start)(struct ieee802154_dev *dev);
|
|
void (*stop)(struct ieee802154_dev *dev);
|
|
int (*xmit)(struct ieee802154_dev *dev,
|
|
struct sk_buff *skb);
|
|
int (*ed)(struct ieee802154_dev *dev, u8 *level);
|
|
int (*set_channel)(struct ieee802154_dev *dev,
|
|
int page,
|
|
int channel);
|
|
int (*set_hw_addr_filt)(struct ieee802154_dev *dev,
|
|
struct ieee802154_hw_addr_filt *filt,
|
|
unsigned long changed);
|
|
int (*ieee_addr)(struct ieee802154_dev *dev, __le64 addr);
|
|
int (*set_txpower)(struct ieee802154_dev *dev, int db);
|
|
int (*set_lbt)(struct ieee802154_dev *dev, bool on);
|
|
int (*set_cca_mode)(struct ieee802154_dev *dev, u8 mode);
|
|
int (*set_cca_ed_level)(struct ieee802154_dev *dev,
|
|
s32 level);
|
|
int (*set_csma_params)(struct ieee802154_dev *dev,
|
|
u8 min_be, u8 max_be, u8 retries);
|
|
int (*set_frame_retries)(struct ieee802154_dev *dev,
|
|
s8 retries);
|
|
};
|
|
|
|
/* Basic interface to register ieee802154 device */
|
|
struct ieee802154_dev *
|
|
ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops);
|
|
void ieee802154_free_device(struct ieee802154_dev *dev);
|
|
int ieee802154_register_device(struct ieee802154_dev *dev);
|
|
void ieee802154_unregister_device(struct ieee802154_dev *dev);
|
|
|
|
void ieee802154_rx_irqsafe(struct ieee802154_dev *dev, struct sk_buff *skb,
|
|
u8 lqi);
|
|
|
|
#endif /* NET_MAC802154_H */
|