diff options
| author | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2015-05-15 15:50:43 +0200 |
|---|---|---|
| committer | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2015-05-21 17:10:42 +0200 |
| commit | 939904672961fa7e28397e27f942a7d1fff4bbdf (patch) | |
| tree | f17d491b73f8c54982da96a2431b45e8d98f6000 /src/gprs_bssgp_pcu.cpp | |
| parent | e43460b50fc152026ab96b5095b94fbac6939ab2 (diff) | |
ms: Support new and old TLLIs
According to the specification (GSM 04.08/24.008, 4.7.1.5) after a
new P-TMSI has been assigned, the old P-TMSI must be kept basically
until it has been used by both sides. Since the TLLI will be derived
from the P-TMSI, the old TLLI must also be kept until the new TLLI
has been used by both MS and SGSN.
This commit modifies the TLLI handling of GprsMs accordingly.
set_tlli() is only used with TLLIs derived from MS messages,
confirm_tlli() is used with TLLIs derived from messages received from
the SGSN. tlli() returns the value set by the MS. check_tlli()
matches each of the TLLI used by either MS or SGSN as well as the old
TLLI until it has been confirmed.
Sponsored-by: On-Waves ehf
Diffstat (limited to 'src/gprs_bssgp_pcu.cpp')
| -rw-r--r-- | src/gprs_bssgp_pcu.cpp | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/gprs_bssgp_pcu.cpp b/src/gprs_bssgp_pcu.cpp index db271a5b..1c356670 100644 --- a/src/gprs_bssgp_pcu.cpp +++ b/src/gprs_bssgp_pcu.cpp @@ -118,6 +118,7 @@ static int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp) struct bssgp_ud_hdr *budh; uint32_t tlli; + uint32_t tlli_old = 0; uint8_t *data; uint16_t len; char imsi[16] = "000"; @@ -163,9 +164,22 @@ static int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp) LOGP(DBSSGP, LOGL_NOTICE, "BSSGP missing mandatory " "PDU_LIFETIME IE\n"); + /* get optional TLLI old */ + if (TLVP_PRESENT(tp, BSSGP_IE_TLLI)) + { + uint8_t tlli_len = TLVP_LEN(tp, BSSGP_IE_PDU_LIFETIME); + uint16_t *e_tlli_old = (uint16_t *) TLVP_VAL(tp, BSSGP_IE_TLLI); + if (tlli_len == 2) + tlli_old = ntohs(*e_tlli_old); + else + LOGP(DBSSGP, LOGL_NOTICE, "BSSGP invalid length of " + "TLLI (old) IE\n"); + } + LOGP(DBSSGP, LOGL_INFO, "LLC [SGSN -> PCU] = TLLI: 0x%08x IMSI: %s len: %d\n", tlli, imsi, len); - return gprs_rlcmac_dl_tbf::handle(the_pcu.bts, tlli, imsi, ms_class, delay_csec, data, len); + return gprs_rlcmac_dl_tbf::handle(the_pcu.bts, tlli, tlli_old, imsi, + ms_class, delay_csec, data, len); } int gprs_bssgp_pcu_rx_paging_ps(struct msgb *msg, struct tlv_parsed *tp) |