diff options
| author | Neels Hofmeyr <nhofmeyr@sysmocom.de> | 2016-03-14 16:06:48 +0100 |
|---|---|---|
| committer | Holger Hans Peter Freyther <holger@moiji-mobile.com> | 2016-03-15 14:11:49 +0100 |
| commit | da7bf4d55a896034320aa4466b9644083093acd1 (patch) | |
| tree | bc3149272eb6e1081c154bae968b62b6e2858a7a /include/osmocom/gsm/protocol | |
| parent | c656faed122b8d858e937d3262acb1925ed6e3d1 (diff) | |
04.08: add inline funcs for transaction id bits
Various users of gsm48_hdr apply the same hardcoded shifts/bitmasks to obtain
the transaction ID encoded in the upper nibble of the protocol discriminator.
Centralize. Patch for openbsc.git will follow.
Diffstat (limited to 'include/osmocom/gsm/protocol')
| -rw-r--r-- | include/osmocom/gsm/protocol/gsm_04_08.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/osmocom/gsm/protocol/gsm_04_08.h b/include/osmocom/gsm/protocol/gsm_04_08.h index 49e977b0..d49b77fe 100644 --- a/include/osmocom/gsm/protocol/gsm_04_08.h +++ b/include/osmocom/gsm/protocol/gsm_04_08.h @@ -763,6 +763,25 @@ static inline uint8_t gsm48_hdr_pdisc(const struct gsm48_hdr *hdr) return pdisc; } +static inline uint8_t gsm48_hdr_trans_id(const struct gsm48_hdr *hdr) +{ + /* + * 3GPP TS 24.007 version 12.0.0 Release 12, + * 11.2.3.1.3 Transaction identifier + */ + return (hdr->proto_discr & 0xf0) >> 4; +} + +static inline uint8_t gsm48_hdr_trans_id_flip_ti(const struct gsm48_hdr *hdr) +{ + return gsm48_hdr_trans_id(hdr) ^ 0x08; +} + +static inline uint8_t gsm48_hdr_trans_id_no_ti(const struct gsm48_hdr *hdr) +{ + return gsm48_hdr_trans_id(hdr) & 0x07; +} + static inline uint8_t gsm48_hdr_msg_type_r98(const struct gsm48_hdr *hdr) { /* |