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