diff options
| author | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2014-09-30 13:49:43 +0200 |
|---|---|---|
| committer | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2014-10-27 11:59:28 +0100 |
| commit | c37ef6cd0e535558b1cc672aa3964eeb506b3f25 (patch) | |
| tree | e578c0edacae26f6f01a68706296e235dc19d875 /openbsc/src/gprs/gb_proxy_patch.c | |
| parent | 91e9f555b6a091663c192c9cd3b8d022a2690eed (diff) | |
gbproxy: Patch BSSGP P-TMSI in PAGING PS messages
Currently the P-TMSI IE in PAGING_PS is not patched.
This commit adds code to patch BSSGP P-TMSI IE in
gbproxy_patch_bssgp independently from the P-TMSI patching at the LLC
layer. It also extends gbproxy_update_link_state_dl to use the IMSI
to find the link_info if the TLLI is not present in the message.
Note that the spec (GSM 08.18, 7.2) requires to use of the P-TMSI
instead of the IMSI to select the MS if that IE is available.
Nevertheless as long as the IMSI is always present in downlink BSSGP
messages and as long as the optional P-TMSI refers to the same MS
(which is the case currently), this is not an issue.
Sponsored-by: On-Waves ehf
Diffstat (limited to 'openbsc/src/gprs/gb_proxy_patch.c')
| -rw-r--r-- | openbsc/src/gprs/gb_proxy_patch.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/openbsc/src/gprs/gb_proxy_patch.c b/openbsc/src/gprs/gb_proxy_patch.c index b14809495..c1d2497db 100644 --- a/openbsc/src/gprs/gb_proxy_patch.c +++ b/openbsc/src/gprs/gb_proxy_patch.c @@ -327,6 +327,19 @@ void gbproxy_patch_bssgp(struct msgb *msg, uint8_t *bssgp, size_t bssgp_len, } } + if (parse_ctx->bssgp_ptmsi_enc && peer->cfg->patch_ptmsi) { + uint32_t ptmsi; + if (parse_ctx->to_bss) + ptmsi = link_info->tlli.ptmsi; + else + ptmsi = link_info->sgsn_tlli.ptmsi; + + if (ptmsi != GSM_RESERVED_TMSI) + gbproxy_patch_ptmsi( + parse_ctx->bssgp_ptmsi_enc, peer, + ptmsi, parse_ctx->to_bss, "BSSGP P-TMSI"); + } + if (parse_ctx->llc) { uint8_t *llc = parse_ctx->llc; size_t llc_len = parse_ctx->llc_len; |