048e7f7e66
This patch cleanups the WARN_ON which occurs when the sk buffer has insufficient buffer space by moving the WARN_ON into if condition. Signed-off-by: Alexander Aring <aar@pengutronix.de> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
498 lines
15 KiB
C
498 lines
15 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 <asm/unaligned.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 <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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__le16 fc;
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/* check if we can fc at skb_mac_header of sk buffer */
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if (WARN_ON(!skb_mac_header_was_set(skb) ||
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(skb_tail_pointer(skb) -
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skb_mac_header(skb)) < IEEE802154_FC_LEN))
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return cpu_to_le16(0);
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memcpy(&fc, skb_mac_header(skb), IEEE802154_FC_LEN);
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return fc;
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}
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/**
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* ieee802154_skb_dst_pan - get the pointer to destination pan field
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* @fc: mac header frame control field
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* @skb: skb where the destination pan pointer will be get from
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*/
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static inline unsigned char *ieee802154_skb_dst_pan(__le16 fc,
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const struct sk_buff *skb)
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{
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unsigned char *dst_pan;
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switch (ieee802154_daddr_mode(fc)) {
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case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
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dst_pan = NULL;
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break;
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case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
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case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
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dst_pan = skb_mac_header(skb) +
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IEEE802154_FC_LEN +
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IEEE802154_SEQ_LEN;
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break;
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default:
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WARN_ONCE(1, "invalid addr mode detected");
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dst_pan = NULL;
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break;
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}
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return dst_pan;
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}
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/**
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* ieee802154_skb_src_pan - get the pointer to source pan field
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* @fc: mac header frame control field
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* @skb: skb where the source pan pointer will be get from
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*/
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static inline unsigned char *ieee802154_skb_src_pan(__le16 fc,
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const struct sk_buff *skb)
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{
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unsigned char *src_pan;
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switch (ieee802154_saddr_mode(fc)) {
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case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
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src_pan = NULL;
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break;
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case cpu_to_le16(IEEE802154_FCTL_SADDR_SHORT):
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case cpu_to_le16(IEEE802154_FCTL_SADDR_EXTENDED):
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/* if intra-pan and source addr mode is non none,
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* then source pan id is equal destination pan id.
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*/
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if (ieee802154_is_intra_pan(fc)) {
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src_pan = ieee802154_skb_dst_pan(fc, skb);
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break;
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}
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switch (ieee802154_daddr_mode(fc)) {
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case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
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src_pan = skb_mac_header(skb) +
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IEEE802154_FC_LEN +
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IEEE802154_SEQ_LEN;
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break;
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case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
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src_pan = skb_mac_header(skb) +
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IEEE802154_FC_LEN +
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IEEE802154_SEQ_LEN +
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IEEE802154_PAN_ID_LEN +
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IEEE802154_SHORT_ADDR_LEN;
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break;
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case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
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src_pan = skb_mac_header(skb) +
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IEEE802154_FC_LEN +
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IEEE802154_SEQ_LEN +
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IEEE802154_PAN_ID_LEN +
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IEEE802154_EXTENDED_ADDR_LEN;
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break;
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default:
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WARN_ONCE(1, "invalid addr mode detected");
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src_pan = NULL;
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break;
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}
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break;
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default:
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WARN_ONCE(1, "invalid addr mode detected");
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src_pan = NULL;
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break;
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}
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return src_pan;
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}
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/**
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* ieee802154_skb_is_intra_pan_addressing - checks whenever the mac addressing
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* is an intra pan communication
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* @fc: mac header frame control field
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* @skb: skb where the source and destination pan should be get from
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*/
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static inline bool ieee802154_skb_is_intra_pan_addressing(__le16 fc,
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const struct sk_buff *skb)
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{
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unsigned char *dst_pan = ieee802154_skb_dst_pan(fc, skb),
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*src_pan = ieee802154_skb_src_pan(fc, skb);
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/* if one is NULL is no intra pan addressing */
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if (!dst_pan || !src_pan)
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return false;
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return !memcmp(dst_pan, src_pan, IEEE802154_PAN_ID_LEN);
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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_le64(get_unaligned_be64(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_be64(get_unaligned_le64(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_be16(get_unaligned_le16(le16_src), be16_dst);
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}
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/**
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* ieee802154_be16_to_le16 - copies and convert be16 to le16
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* @le16_dst: le16 destination pointer
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* @be16_src: be16 source pointer
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*/
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static inline void ieee802154_be16_to_le16(void *le16_dst, const void *be16_src)
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{
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put_unaligned_le16(get_unaligned_be16(be16_src), le16_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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