path: root/openbsc/src/gprs/gb_proxy_patch.c
diff options
authorJacob Erlbeck <>2014-09-30 13:49:43 +0200
committerJacob Erlbeck <>2014-10-27 11:59:28 +0100
commitc37ef6cd0e535558b1cc672aa3964eeb506b3f25 (patch)
treee578c0edacae26f6f01a68706296e235dc19d875 /openbsc/src/gprs/gb_proxy_patch.c
parent91e9f555b6a091663c192c9cd3b8d022a2690eed (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')
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 b148094..c1d2497 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;