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ieee802154: add ieee802154_skb_dst_pan helper

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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: Alexander Aring <aar@pengutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2016-07-06 23:32:24 +02:00 committed by Marcel Holtmann
parent 47ca5898eb
commit 9cc577dd25
2 changed files with 45 additions and 0 deletions
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16
include/linux/ieee802154.h
View File

@ -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:

29
include/net/mac802154.h
View File

@ -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