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8911d7748c
This patch changes the lowpan_header_decompress function by removing inklayer related information from parameters. This is currently for supporting short and extended address for iphc handling in 802154. We don't support short address handling anyway right now, but there exists already code for handling short addresses in lowpan_header_decompress. The address parameters are also changed to a void pointer, so 6LoWPAN linklayer specific code can put complex structures as these parameters and cast it again inside the generic code by evaluating linklayer type before. The order is also changed by destination address at first and then source address, which is the same like all others functions where destination is always the first, memcpy, dev_hard_header, lowpan_header_compress, etc. This patch also moves the fetching of iphc values from 6LoWPAN linklayer specific code into the generic branch. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
378 lines
12 KiB
C
378 lines
12 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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*/
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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/ieee802154.h>
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#include <linux/skbuff.h>
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#include <linux/unaligned/memmove.h>
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#include <net/cfg802154.h>
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/**
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* enum ieee802154_hw_addr_filt_flags - hardware address filtering flags
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*
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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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* @IEEE802154_AFILT_SADDR_CHANGED: Indicates that the short address will be
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* change.
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*
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* @IEEE802154_AFILT_IEEEADDR_CHANGED: Indicates that the extended address
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* will be change.
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*
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* @IEEE802154_AFILT_PANID_CHANGED: Indicates that the pan id will be change.
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*
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* @IEEE802154_AFILT_PANC_CHANGED: Indicates that the address filter will
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* do frame address filtering as a pan coordinator.
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*/
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enum ieee802154_hw_addr_filt_flags {
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IEEE802154_AFILT_SADDR_CHANGED = BIT(0),
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IEEE802154_AFILT_IEEEADDR_CHANGED = BIT(1),
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IEEE802154_AFILT_PANID_CHANGED = BIT(2),
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IEEE802154_AFILT_PANC_CHANGED = BIT(3),
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};
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/**
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* struct ieee802154_hw_addr_filt - hardware address filtering settings
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*
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* @pan_id: pan_id which should be set to the hardware address filter.
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*
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* @short_addr: short_addr which should be set to the hardware address filter.
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*
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* @ieee_addr: extended address which should be set to the hardware address
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* filter.
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*
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* @pan_coord: boolean if hardware filtering should be operate as coordinator.
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*/
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struct ieee802154_hw_addr_filt {
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__le16 pan_id;
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__le16 short_addr;
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__le64 ieee_addr;
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bool pan_coord;
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};
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/**
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* struct ieee802154_hw - ieee802154 hardware
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*
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* @extra_tx_headroom: headroom to reserve in each transmit skb for use by the
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* driver (e.g. for transmit headers.)
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*
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* @flags: hardware flags, see &enum ieee802154_hw_flags
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*
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* @parent: parent device of the hardware.
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*
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* @priv: pointer to private area that was allocated for driver use along with
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* this structure.
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*
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* @phy: This points to the &struct wpan_phy allocated for this 802.15.4 PHY.
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*/
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struct ieee802154_hw {
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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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void *priv;
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/* filled by mac802154 core */
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struct wpan_phy *phy;
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};
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/**
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* enum ieee802154_hw_flags - hardware flags
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*
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* These 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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* @IEEE802154_HW_TX_OMIT_CKSUM: Indicates that xmitter will add FCS on it's
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* own.
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*
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* @IEEE802154_HW_LBT: Indicates that transceiver will support listen before
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* transmit.
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*
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* @IEEE802154_HW_CSMA_PARAMS: Indicates that transceiver will support csma
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* parameters (max_be, min_be, backoff exponents).
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*
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* @IEEE802154_HW_FRAME_RETRIES: Indicates that transceiver will support ARET
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* frame retries setting.
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*
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* @IEEE802154_HW_AFILT: Indicates that transceiver will support hardware
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* address filter setting.
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*
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* @IEEE802154_HW_PROMISCUOUS: Indicates that transceiver will support
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* promiscuous mode setting.
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*
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* @IEEE802154_HW_RX_OMIT_CKSUM: Indicates that receiver omits FCS.
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*
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* @IEEE802154_HW_RX_DROP_BAD_CKSUM: Indicates that receiver will not filter
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* frames with bad checksum.
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*/
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enum ieee802154_hw_flags {
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IEEE802154_HW_TX_OMIT_CKSUM = BIT(0),
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IEEE802154_HW_LBT = BIT(1),
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IEEE802154_HW_CSMA_PARAMS = BIT(2),
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IEEE802154_HW_FRAME_RETRIES = BIT(3),
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IEEE802154_HW_AFILT = BIT(4),
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IEEE802154_HW_PROMISCUOUS = BIT(5),
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IEEE802154_HW_RX_OMIT_CKSUM = BIT(6),
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IEEE802154_HW_RX_DROP_BAD_CKSUM = BIT(7),
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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 (IEEE802154_HW_TX_OMIT_CKSUM | \
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IEEE802154_HW_RX_OMIT_CKSUM)
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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_sync:
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* 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. This is called by a workqueue and useful for
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* synchronous 802.15.4 drivers.
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* This function should return zero or negative errno.
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*
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* WARNING:
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* This will be deprecated soon. We don't accept synced xmit callbacks
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* drivers anymore.
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*
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* xmit_async:
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* 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.
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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 mBm. 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 mBm. 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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* set_promiscuous_mode
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* Enables or disable promiscuous mode.
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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_hw *hw);
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void (*stop)(struct ieee802154_hw *hw);
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int (*xmit_sync)(struct ieee802154_hw *hw,
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struct sk_buff *skb);
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int (*xmit_async)(struct ieee802154_hw *hw,
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struct sk_buff *skb);
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int (*ed)(struct ieee802154_hw *hw, u8 *level);
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int (*set_channel)(struct ieee802154_hw *hw, u8 page,
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u8 channel);
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int (*set_hw_addr_filt)(struct ieee802154_hw *hw,
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struct ieee802154_hw_addr_filt *filt,
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unsigned long changed);
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int (*set_txpower)(struct ieee802154_hw *hw, s32 mbm);
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int (*set_lbt)(struct ieee802154_hw *hw, bool on);
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int (*set_cca_mode)(struct ieee802154_hw *hw,
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const struct wpan_phy_cca *cca);
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int (*set_cca_ed_level)(struct ieee802154_hw *hw, s32 mbm);
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int (*set_csma_params)(struct ieee802154_hw *hw,
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u8 min_be, u8 max_be, u8 retries);
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int (*set_frame_retries)(struct ieee802154_hw *hw,
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s8 retries);
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int (*set_promiscuous_mode)(struct ieee802154_hw *hw,
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const bool on);
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};
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/**
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* ieee802154_get_fc_from_skb - get the frame control field from an skb
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* @skb: skb where the frame control field will be get from
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*/
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static inline __le16 ieee802154_get_fc_from_skb(const struct sk_buff *skb)
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{
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/* return some invalid fc on failure */
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if (unlikely(skb->len < 2)) {
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WARN_ON(1);
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return cpu_to_le16(0);
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}
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return (__force __le16)__get_unaligned_memmove16(skb_mac_header(skb));
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}
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/**
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* ieee802154_be64_to_le64 - copies and convert be64 to le64
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* @le64_dst: le64 destination pointer
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* @be64_src: be64 source pointer
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*/
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static inline void ieee802154_be64_to_le64(void *le64_dst, const void *be64_src)
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{
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__put_unaligned_memmove64(swab64p(be64_src), le64_dst);
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}
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/**
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* ieee802154_le64_to_be64 - copies and convert le64 to be64
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* @be64_dst: be64 destination pointer
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* @le64_src: le64 source pointer
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*/
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static inline void ieee802154_le64_to_be64(void *be64_dst, const void *le64_src)
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{
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__put_unaligned_memmove64(swab64p(le64_src), be64_dst);
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}
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/**
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* ieee802154_le16_to_be16 - copies and convert le16 to be16
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* @be16_dst: be16 destination pointer
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* @le16_src: le16 source pointer
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*/
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static inline void ieee802154_le16_to_be16(void *be16_dst, const void *le16_src)
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{
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__put_unaligned_memmove16(swab16p(le16_src), be16_dst);
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}
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/**
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* ieee802154_alloc_hw - Allocate a new hardware device
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*
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* This must be called once for each hardware device. The returned pointer
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* must be used to refer to this device when calling other functions.
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* mac802154 allocates a private data area for the driver pointed to by
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* @priv in &struct ieee802154_hw, the size of this area is given as
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* @priv_data_len.
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*
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* @priv_data_len: length of private data
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* @ops: callbacks for this device
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*
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* Return: A pointer to the new hardware device, or %NULL on error.
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*/
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struct ieee802154_hw *
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ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops);
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/**
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* ieee802154_free_hw - free hardware descriptor
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*
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* This function frees everything that was allocated, including the
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* private data for the driver. You must call ieee802154_unregister_hw()
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* before calling this function.
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*
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* @hw: the hardware to free
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*/
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void ieee802154_free_hw(struct ieee802154_hw *hw);
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/**
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* ieee802154_register_hw - Register hardware device
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*
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* You must call this function before any other functions in
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* mac802154. Note that before a hardware can be registered, you
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* need to fill the contained wpan_phy's information.
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*
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* @hw: the device to register as returned by ieee802154_alloc_hw()
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*
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* Return: 0 on success. An error code otherwise.
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*/
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int ieee802154_register_hw(struct ieee802154_hw *hw);
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/**
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* ieee802154_unregister_hw - Unregister a hardware device
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*
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* This function instructs mac802154 to free allocated resources
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* and unregister netdevices from the networking subsystem.
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*
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* @hw: the hardware to unregister
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*/
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void ieee802154_unregister_hw(struct ieee802154_hw *hw);
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/**
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* ieee802154_rx_irqsafe - receive frame
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*
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* Like ieee802154_rx() but can be called in IRQ context
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* (internally defers to a tasklet.)
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*
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* @hw: the hardware this frame came in on
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* @skb: the buffer to receive, owned by mac802154 after this call
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* @lqi: link quality indicator
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*/
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void ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb,
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u8 lqi);
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/**
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* ieee802154_wake_queue - wake ieee802154 queue
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* @hw: pointer as obtained from ieee802154_alloc_hw().
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*
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* Drivers should use this function instead of netif_wake_queue.
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*/
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void ieee802154_wake_queue(struct ieee802154_hw *hw);
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/**
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* ieee802154_stop_queue - stop ieee802154 queue
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* @hw: pointer as obtained from ieee802154_alloc_hw().
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*
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* Drivers should use this function instead of netif_stop_queue.
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*/
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void ieee802154_stop_queue(struct ieee802154_hw *hw);
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/**
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* ieee802154_xmit_complete - frame transmission complete
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*
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* @hw: pointer as obtained from ieee802154_alloc_hw().
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* @skb: buffer for transmission
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* @ifs_handling: indicate interframe space handling
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*/
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void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
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bool ifs_handling);
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#endif /* NET_MAC802154_H */
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