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Commit 9cc577dd authored by Alexander Aring's avatar Alexander Aring Committed by Marcel Holtmann
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ieee802154: add ieee802154_skb_dst_pan helper 



This patch adds ieee802154_skb_dst_pan function to get the pointer
address of the destination pan id at skb mac pointer.

Signed-off-by: default avatarAlexander Aring <aar@pengutronix.de>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 47ca5898

include/linux/ieee802154.h

+16 −0
Original line number Diff line number Diff line
@@ -31,6 +31,8 @@ 
#define IEEE802154_MIN_PSDU_LEN		9

#define IEEE802154_FCS_LEN		2

#define IEEE802154_MAX_AUTH_TAG_LEN	16

#define IEEE802154_FC_LEN		2

#define IEEE802154_SEQ_LEN		1



/*  General MAC frame format:

 *  2 bytes: Frame Control
@@ -221,9 +223,14 @@ enum { 
#define IEEE802154_FCTL_ACKREQ		0x0020

#define IEEE802154_FCTL_SECEN		0x0004

#define IEEE802154_FCTL_INTRA_PAN	0x0040

#define IEEE802154_FCTL_DADDR		0x0c00



#define IEEE802154_FTYPE_DATA		0x0001



#define IEEE802154_FCTL_ADDR_NONE	0x0000

#define IEEE802154_FCTL_DADDR_SHORT	0x0800

#define IEEE802154_FCTL_DADDR_EXTENDED	0x0c00



/*

 * ieee802154_is_data - check if type is IEEE802154_FTYPE_DATA

 * @fc: frame control bytes in little-endian byteorder
@@ -261,6 +268,15 @@ static inline bool ieee802154_is_intra_pan(__le16 fc) 
	return fc & cpu_to_le16(IEEE802154_FCTL_INTRA_PAN);

}



/*

 * ieee802154_daddr_mode - get daddr mode from fc

 * @fc: frame control bytes in little-endian byteorder

 */

static inline __le16 ieee802154_daddr_mode(__le16 fc)

{

	return fc & cpu_to_le16(IEEE802154_FCTL_DADDR);

}



/**

 * ieee802154_is_valid_psdu_len - check if psdu len is valid

 * available lengths:

include/net/mac802154.h

+29 −0
Original line number Diff line number Diff line
@@ -257,6 +257,35 @@ static inline __le16 ieee802154_get_fc_from_skb(const struct sk_buff *skb) 
	return get_unaligned_le16(skb_mac_header(skb));

}



/**

 * ieee802154_skb_dst_pan - get the pointer to destination pan field

 * @fc: mac header frame control field

 * @skb: skb where the destination pan pointer will be get from

 */

static inline unsigned char *ieee802154_skb_dst_pan(__le16 fc,

						    const struct sk_buff *skb)

{

	unsigned char *dst_pan;



	switch (ieee802154_daddr_mode(fc)) {

	case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):

		dst_pan = NULL;

		break;

	case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):

	case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):

		dst_pan = skb_mac_header(skb) +

			  IEEE802154_FC_LEN +

			  IEEE802154_SEQ_LEN;

		break;

	default:

		WARN_ONCE(1, "invalid addr mode detected");

		dst_pan = NULL;

		break;

	}



	return dst_pan;

}



/**

 * ieee802154_be64_to_le64 - copies and convert be64 to le64

 * @le64_dst: le64 destination pointer