Review at https://gerrit.osmocom.org/169

gprs_gmm.c: Make TLLI handling specific to Gb interface

Soem of the operations we perform in the GMM layer are specific to the GPRS/EDGE radio access network and its Gb interface. Let's make them conditional to that in preparation of supporting an Iu interface.

Change-Id: I02e83dcae05673158884ae88a48f1c108d28f5a2 --- M openbsc/src/gprs/gprs_gmm.c 1 file changed, 59 insertions(+), 35 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/openbsc refs/changes/69/169/1

diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c index e788e3d..d521342 100644 --- a/openbsc/src/gprs/gprs_gmm.c +++ b/openbsc/src/gprs/gprs_gmm.c @@ -904,8 +904,10 @@ strncpy(ctx->imsi, mi_string, sizeof(ctx->imsi) - 1); #endif } - ctx->gb.tlli = msgb_tlli(msg); - ctx->gb.llme = llme; + if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { + ctx->gb.tlli = msgb_tlli(msg); + ctx->gb.llme = llme; + } msgid2mmctx(ctx, msg); break; case GSM_MI_TYPE_TMSI: @@ -920,8 +922,10 @@ ctx = sgsn_mm_ctx_alloc(msgb_tlli(msg), &ra_id); ctx->p_tmsi = tmsi; } - ctx->gb.tlli = msgb_tlli(msg); - ctx->gb.llme = llme; + if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { + ctx->gb.tlli = msgb_tlli(msg); + ctx->gb.llme = llme; + } msgid2mmctx(ctx, msg); break; default: @@ -932,7 +936,8 @@ } /* Update MM Context with currient RA and Cell ID */ ctx->ra = ra_id; - ctx->gb.cell_id = cid; + if (ctx->ran_type == MM_CTX_T_GERAN_Gb) + ctx->gb.cell_id = cid; /* Update MM Context with other data */ ctx->drx_parms = drx_par; ctx->ms_radio_access_capa.len = ms_ra_acc_cap_len; @@ -950,13 +955,16 @@ } ctx->mm_state = GMM_COMMON_PROC_INIT; #endif - /* Even if there is no P-TMSI allocated, the MS will switch from - * foreign TLLI to local TLLI */ - ctx->gb.tlli_new = gprs_tmsi2tlli(ctx->p_tmsi, TLLI_LOCAL);

- /* Inform LLC layer about new TLLI but keep old active */ - gprs_llgmm_assign(ctx->gb.llme, ctx->gb.tlli, ctx->gb.tlli_new, - GPRS_ALGO_GEA0, NULL); + if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Even if there is no P-TMSI allocated, the MS will + * switch from foreign TLLI to local TLLI */ + ctx->gb.tlli_new = gprs_tmsi2tlli(ctx->p_tmsi, TLLI_LOCAL); + + /* Inform LLC layer about new TLLI but keep old active */ + gprs_llgmm_assign(ctx->gb.llme, ctx->gb.tlli, ctx->gb.tlli_new, + GPRS_ALGO_GEA0, NULL); + }

ctx->pending_req = GSM48_MT_GMM_ATTACH_REQ; return gsm48_gmm_authorize(ctx); @@ -1218,8 +1226,10 @@

/* Update the MM context with the new RA-ID */ bssgp_parse_cell_id(&mmctx->ra, msgb_bcid(msg)); - /* Update the MM context with the new (i.e. foreign) TLLI */ - mmctx->gb.tlli = msgb_tlli(msg); + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Update the MM context with the new (i.e. foreign) TLLI */ + mmctx->gb.tlli = msgb_tlli(msg); + } /* FIXME: Update the MM context with the MS radio acc capabilities */ /* FIXME: Update the MM context with the MS network capabilities */

@@ -1244,13 +1254,16 @@ sig_data.mm = mmctx; osmo_signal_dispatch(SS_SGSN, S_SGSN_UPDATE, &sig_data); #endif - /* Even if there is no P-TMSI allocated, the MS will switch from - * foreign TLLI to local TLLI */ - mmctx->gb.tlli_new = gprs_tmsi2tlli(mmctx->p_tmsi, TLLI_LOCAL); + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Even if there is no P-TMSI allocated, the MS will switch from + * foreign TLLI to local TLLI */ + mmctx->gb.tlli_new = gprs_tmsi2tlli(mmctx->p_tmsi, TLLI_LOCAL);

- /* Inform LLC layer about new TLLI but keep old active */ - gprs_llgmm_assign(mmctx->gb.llme, mmctx->gb.tlli, mmctx->gb.tlli_new, - GPRS_ALGO_GEA0, NULL); + /* Inform LLC layer about new TLLI but keep old active */ + gprs_llgmm_assign(mmctx->gb.llme, mmctx->gb.tlli, + mmctx->gb.tlli_new, GPRS_ALGO_GEA0, + NULL); + }

/* Look at PDP Context Status IE and see if MS's view of * activated/deactivated NSAPIs agrees with our view */ @@ -1270,10 +1283,13 @@ rc = gsm48_tx_gmm_ra_upd_rej(msg, reject_cause); if (mmctx) mm_ctx_cleanup_free(mmctx, "GPRS RA UPDATE REJ"); - else - /* TLLI unassignment */ - gprs_llgmm_assign(llme, llme->tlli, 0xffffffff, GPRS_ALGO_GEA0, - NULL); + else { + if (llme) { + /* TLLI unassignment */ + gprs_llgmm_assign(llme, llme->tlli, 0xffffffff, + GPRS_ALGO_GEA0, NULL); + } + }

return rc; } @@ -1387,10 +1403,13 @@ mmctx->t3350_mode = GMM_T3350_MODE_NONE; mmctx->p_tmsi_old = 0; mmctx->pending_req = 0; - /* Unassign the old TLLI */ - mmctx->gb.tlli = mmctx->gb.tlli_new; - gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, - GPRS_ALGO_GEA0, NULL); + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Unassign the old TLLI */ + mmctx->gb.tlli = mmctx->gb.tlli_new; + gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, + mmctx->gb.tlli_new, + GPRS_ALGO_GEA0, NULL); + } mmctx->mm_state = GMM_REGISTERED_NORMAL; rc = 0;

@@ -1407,10 +1426,12 @@ mmctx->t3350_mode = GMM_T3350_MODE_NONE; mmctx->p_tmsi_old = 0; mmctx->pending_req = 0; - /* Unassign the old TLLI */ - mmctx->gb.tlli = mmctx->gb.tlli_new; - gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, - GPRS_ALGO_GEA0, NULL); + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Unassign the old TLLI */ + mmctx->gb.tlli = mmctx->gb.tlli_new; + gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, + GPRS_ALGO_GEA0, NULL); + } mmctx->mm_state = GMM_REGISTERED_NORMAL; rc = 0;

@@ -1426,9 +1447,11 @@ mmctx->t3350_mode = GMM_T3350_MODE_NONE; mmctx->p_tmsi_old = 0; mmctx->pending_req = 0; - /* Unassign the old TLLI */ - mmctx->gb.tlli = mmctx->gb.tlli_new; - //gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Unassign the old TLLI */ + mmctx->gb.tlli = mmctx->gb.tlli_new; + //gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); + } rc = 0; break; case GSM48_MT_GMM_AUTH_CIPH_RESP: @@ -2109,7 +2132,8 @@ int gsm0408_gprs_force_reattach(struct sgsn_mm_ctx *mmctx) { int rc; - gprs_llgmm_reset(mmctx->gb.llme); + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) + gprs_llgmm_reset(mmctx->gb.llme);

rc = gsm48_tx_gmm_detach_req( mmctx, GPRS_DET_T_MT_REATT_REQ, GMM_CAUSE_IMPL_DETACHED);