diff options
| author | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2014-06-02 10:49:01 +0200 |
|---|---|---|
| committer | Holger Hans Peter Freyther <holger@moiji-mobile.com> | 2014-06-04 16:29:30 +0200 |
| commit | b492d39177f6df893772ee6c7c37f51caa9f0d64 (patch) | |
| tree | b49d68a0781c47e833c6b5a455005d0a081129e7 /openbsc/include | |
| parent | def0391ec55ab79d22c07d56a7c777ae8dcab0e0 (diff) | |
gprs: Separate LLC parsing from LLC state handling
Currently LLC parsing is part of gprs_llc.c which needs large parts
of the SGSN code parsing to fulfill its link dependencies.
This patch moves the functions that just do plain parsing, dumping,
and FCS computation to a different file to avoid these dependencies
if LLC stateful processing is not needed. It also exposes
struct gprs_llc_hdr_parsed and enum gprs_llc_cmd publically.
Sponsored-by: On-Waves ehf
Diffstat (limited to 'openbsc/include')
| -rw-r--r-- | openbsc/include/openbsc/gprs_llc.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/gprs_llc.h b/openbsc/include/openbsc/gprs_llc.h index 4be7b1f18..854b9688a 100644 --- a/openbsc/include/openbsc/gprs_llc.h +++ b/openbsc/include/openbsc/gprs_llc.h @@ -165,6 +165,39 @@ struct gprs_llc_llme { extern struct llist_head gprs_llc_llmes; +/* LLC low level types */ + +enum gprs_llc_cmd { + GPRS_LLC_NULL, + GPRS_LLC_RR, + GPRS_LLC_ACK, + GPRS_LLC_RNR, + GPRS_LLC_SACK, + GPRS_LLC_DM, + GPRS_LLC_DISC, + GPRS_LLC_UA, + GPRS_LLC_SABM, + GPRS_LLC_FRMR, + GPRS_LLC_XID, + GPRS_LLC_UI, +}; + +struct gprs_llc_hdr_parsed { + uint8_t sapi; + uint8_t is_cmd:1, + ack_req:1, + is_encrypted:1; + uint32_t seq_rx; + uint32_t seq_tx; + uint32_t fcs; + uint32_t fcs_calc; + uint8_t *data; + uint16_t data_len; + uint16_t crc_length; + enum gprs_llc_cmd cmd; +}; + + /* BSSGP-UL-UNITDATA.ind */ int gprs_llc_rcvmsg(struct msgb *msg, struct tlv_parsed *tv); @@ -199,4 +232,12 @@ static inline int gprs_llc_is_retransmit(uint16_t nu, uint16_t vur) return 0 < delta && delta < 32; } +/* LLC low level functions */ + +/* parse a GPRS LLC header, also check for invalid frames */ +int gprs_llc_hdr_parse(struct gprs_llc_hdr_parsed *ghp, + uint8_t *llc_hdr, int len); +void gprs_llc_hdr_dump(struct gprs_llc_hdr_parsed *gph); +int gprs_llc_fcs(uint8_t *data, unsigned int len); + #endif |