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ieee802154: add ieee802154_skb_src_pan helper

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This patch adds ieee802154_skb_src_pan function to get the pointer
address of the source 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 23:32:25 +02:00 committed by Marcel Holtmann
parent 9cc577dd25
commit 19580cc1ed
2 changed files with 72 additions and 0 deletions
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13
include/linux/ieee802154.h
View file

@ -50,6 +50,7 @@
#define IEEE802154_EXTENDED_ADDR_LEN 8
#define IEEE802154_SHORT_ADDR_LEN 2
#define IEEE802154_PAN_ID_LEN 2
#define IEEE802154_LIFS_PERIOD 40
#define IEEE802154_SIFS_PERIOD 12
@ -224,12 +225,15 @@ enum {
#define IEEE802154_FCTL_SECEN 0x0004
#define IEEE802154_FCTL_INTRA_PAN 0x0040
#define IEEE802154_FCTL_DADDR 0x0c00
#define IEEE802154_FCTL_SADDR 0xc000
#define IEEE802154_FTYPE_DATA 0x0001
#define IEEE802154_FCTL_ADDR_NONE 0x0000
#define IEEE802154_FCTL_DADDR_SHORT 0x0800
#define IEEE802154_FCTL_DADDR_EXTENDED 0x0c00
#define IEEE802154_FCTL_SADDR_SHORT 0x8000
#define IEEE802154_FCTL_SADDR_EXTENDED 0xc000
/*
* ieee802154_is_data - check if type is IEEE802154_FTYPE_DATA
@ -277,6 +281,15 @@ static inline __le16 ieee802154_daddr_mode(__le16 fc)
return fc & cpu_to_le16(IEEE802154_FCTL_DADDR);
}
/*
* ieee802154_saddr_mode - get saddr mode from fc
* @fc: frame control bytes in little-endian byteorder
*/
static inline __le16 ieee802154_saddr_mode(__le16 fc)
{
return fc & cpu_to_le16(IEEE802154_FCTL_SADDR);
}
/**
* ieee802154_is_valid_psdu_len - check if psdu len is valid
* available lengths:

59
include/net/mac802154.h
View file

@ -286,6 +286,65 @@ static inline unsigned char *ieee802154_skb_dst_pan(__le16 fc,
return dst_pan;
}
/**
* ieee802154_skb_src_pan - get the pointer to source pan field
* @fc: mac header frame control field
* @skb: skb where the source pan pointer will be get from
*/
static inline unsigned char *ieee802154_skb_src_pan(__le16 fc,
const struct sk_buff *skb)
{
unsigned char *src_pan;
switch (ieee802154_saddr_mode(fc)) {
case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
src_pan = NULL;
break;
case cpu_to_le16(IEEE802154_FCTL_SADDR_SHORT):
case cpu_to_le16(IEEE802154_FCTL_SADDR_EXTENDED):
/* if intra-pan and source addr mode is non none,
* then source pan id is equal destination pan id.
*/
if (ieee802154_is_intra_pan(fc)) {
src_pan = ieee802154_skb_dst_pan(fc, skb);
break;
}
switch (ieee802154_daddr_mode(fc)) {
case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
src_pan = skb_mac_header(skb) +
IEEE802154_FC_LEN +
IEEE802154_SEQ_LEN;
break;
case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
src_pan = skb_mac_header(skb) +
IEEE802154_FC_LEN +
IEEE802154_SEQ_LEN +
IEEE802154_PAN_ID_LEN +
IEEE802154_SHORT_ADDR_LEN;
break;
case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
src_pan = skb_mac_header(skb) +
IEEE802154_FC_LEN +
IEEE802154_SEQ_LEN +
IEEE802154_PAN_ID_LEN +
IEEE802154_EXTENDED_ADDR_LEN;
break;
default:
WARN_ONCE(1, "invalid addr mode detected");
src_pan = NULL;
break;
}
break;
default:
WARN_ONCE(1, "invalid addr mode detected");
src_pan = NULL;
break;
}
return src_pan;
}
/**
* ieee802154_be64_to_le64 - copies and convert be64 to le64
* @le64_dst: le64 destination pointer