fixeria has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmocom-bb/+/34810?usp=email ) Change subject: mobile: improve handling of Bearer Capability IE for MT calls ...................................................................... mobile: improve handling of Bearer Capability IE for MT calls This patch prepares for adding MT data call support: * Move handling of the Bearer Capability IE into a function. * Check transfer mode and coding standard in the received BCap. Change-Id: I3a5cac8c35ba6b7bdc5fcb077690b32848747756 Related: OS#4396 --- M src/host/layer23/src/mobile/mnccms.c 1 file changed, 133 insertions(+), 58 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmocom-bb refs/changes/10/34810/1 diff --git a/src/host/layer23/src/mobile/mnccms.c b/src/host/layer23/src/mobile/mnccms.c index be43afa..d23fbb7 100644 --- a/src/host/layer23/src/mobile/mnccms.c +++ b/src/host/layer23/src/mobile/mnccms.c @@ -192,6 +192,119 @@ mncc->bearer_cap.mode = GSM48_BCAP_TMOD_CIRCUIT; } +/* Check the given Bearer Capability, select first supported speech codec version. + * The choice between half-rate and full-rate is made based on current settings. + * Return a selected codec or -1 if no speech codec was selected. */ +static int mncc_handle_bcap_speech(const struct gsm_mncc_bearer_cap *bcap, + const struct gsm_settings *set) +{ + int speech_ver_half = -1; + int speech_ver = -1; + + for (unsigned int i = 0; bcap->speech_ver[i] >= 0; i++) { + int temp = mncc_get_bearer(set, bcap->speech_ver[i]); + switch (temp) { + case GSM48_BCAP_SV_AMR_H: + case GSM48_BCAP_SV_HR: + /* only the first half rate */ + if (speech_ver_half < 0) + speech_ver_half = temp; + break; + default: + if (temp < 0) + continue; + /* only the first full rate */ + if (speech_ver < 0) + speech_ver = temp; + break; + } + } + + /* half and full given */ + if (speech_ver_half >= 0 && speech_ver >= 0) { + if (set->half_prefer) { + LOGP(DMNCC, LOGL_INFO, " both supported" + " codec rates are given, using " + "preferred half rate\n"); + speech_ver = speech_ver_half; + } else { + LOGP(DMNCC, LOGL_INFO, " both supported" + " codec rates are given, using " + "preferred full rate\n"); + } + } else if (speech_ver_half < 0 && speech_ver < 0) { + LOGP(DMNCC, LOGL_INFO, " no supported codec " + "rate is given\n"); + /* only half rate is given, use it */ + } else if (speech_ver_half >= 0) { + LOGP(DMNCC, LOGL_INFO, " only supported half " + "rate codec is given, using it\n"); + speech_ver = speech_ver_half; + /* only full rate is given, use it */ + } else { + LOGP(DMNCC, LOGL_INFO, " only supported full " + "rate codec is given, using it\n"); + } + + return speech_ver; +} + +static int mncc_handle_bcap(struct gsm_mncc *mncc_out, /* CC Call Confirmed */ + const struct gsm_mncc *mncc_in, /* CC Setup */ + const struct gsm_settings *set) +{ + const struct gsm_mncc_bearer_cap *bcap = &mncc_in->bearer_cap; + + /* 3GPP TS 24.008, section 9.3.2.2 defines several cases in which the + * Bearer Capability 1 IE is to be included, provided that at least + * one of these conditions is met. */ + + /* if the Bearer Capability 1 IE is not present */ + if (~mncc_in->fields & MNCC_F_BEARER_CAP) { + /* ... include our own Bearer Capability, assuming a speech call */ + mncc_set_bearer(mncc_out, set, -1); + return 0; + } + + if (bcap->mode != GSM48_BCAP_TMOD_CIRCUIT) { + LOGP(DMNCC, LOGL_ERROR, + "%s(): Transfer mode 0x%02x is not supported\n", + __func__, bcap->mode); + return -ENOTSUP; + } + if (bcap->coding != GSM48_BCAP_CODING_GSM_STD) { + LOGP(DMNCC, LOGL_ERROR, + "%s(): Coding standard 0x%02x is not supported\n", + __func__, bcap->coding); + return -ENOTSUP; + } + + switch (bcap->transfer) { + case GSM48_BCAP_ITCAP_SPEECH: + { + int speech_ver = mncc_handle_bcap_speech(bcap, set); + /* include bearer cap, if not given in setup (see above) + * or if multiple codecs are given + * or if not only full rate + * or if given codec is unimplemented + */ + if (speech_ver < 0) + mncc_set_bearer(mncc_out, set, -1); + else if (bcap->speech_ver[1] >= 0 || speech_ver != 0) + mncc_set_bearer(mncc_out, set, speech_ver); + break; + } + case GSM48_BCAP_ITCAP_UNR_DIG_INF: + default: + LOGP(DMNCC, LOGL_ERROR, + "%s(): Information transfer capability 0x%02x is not supported\n", + __func__, bcap->transfer); + return -ENOTSUP; + } + + return 0; +} + /* * MNCCms dummy application */ @@ -264,7 +377,6 @@ struct gsm_call *call = get_call_ref(data->callref); struct gsm_mncc mncc; uint8_t cause; - int8_t speech_ver = -1, speech_ver_half = -1, temp; int first_call = 0; /* call does not exist */ @@ -397,53 +509,6 @@ cause = GSM48_CC_CAUSE_USER_BUSY; goto release; } - /* select first supported speech_ver */ - if ((data->fields & MNCC_F_BEARER_CAP)) { - int i; - - for (i = 0; data->bearer_cap.speech_ver[i] >= 0; i++) { - temp = mncc_get_bearer(set, data->bearer_cap.speech_ver[i]); - switch (temp) { - case GSM48_BCAP_SV_AMR_H: - case GSM48_BCAP_SV_HR: - /* only the first half rate */ - if (speech_ver_half < 0) - speech_ver_half = temp; - break; - default: - if (temp < 0) - continue; - /* only the first full rate */ - if (speech_ver < 0) - speech_ver = temp; - break; - } - } - /* half and full given */ - if (speech_ver_half >= 0 && speech_ver >= 0) { - if (set->half_prefer) { - LOGP(DMNCC, LOGL_INFO, " both supported" - " codec rates are given, using " - "preferred half rate\n"); - speech_ver = speech_ver_half; - } else - LOGP(DMNCC, LOGL_INFO, " both supported" - " codec rates are given, using " - "preferred full rate\n"); - } else if (speech_ver_half < 0 && speech_ver < 0) { - LOGP(DMNCC, LOGL_INFO, " no supported codec " - "rate is given\n"); - /* only half rate is given, use it */ - } else if (speech_ver_half >= 0) { - LOGP(DMNCC, LOGL_INFO, " only supported half " - "rate codec is given, using it\n"); - speech_ver = speech_ver_half; - /* only full rate is given, use it */ - } else { - LOGP(DMNCC, LOGL_INFO, " only supported full " - "rate codec is given, using it\n"); - } - } /* presentation allowed if present == 0 */ if (data->calling.present || !data->calling.number[0]) l23_vty_ms_notify(ms, "Incoming call (anonymous)\n"); @@ -460,16 +525,11 @@ data->calling.number, call->callref); memset(&mncc, 0, sizeof(struct gsm_mncc)); mncc.callref = call->callref; - /* only include bearer cap, if not given in setup - * or if multiple codecs are given - * or if not only full rate - * or if given codec is unimplemented - */ - if (!(data->fields & MNCC_F_BEARER_CAP) || speech_ver < 0) - mncc_set_bearer(&mncc, set, -1); - else if (data->bearer_cap.speech_ver[1] >= 0 - || speech_ver != 0) - mncc_set_bearer(&mncc, set, speech_ver); + /* Bearer capability (optional) */ + if (mncc_handle_bcap(&mncc, data, &ms->settings) != 0) { + cause = GSM48_CC_CAUSE_INCOMPAT_DEST; + goto release; + } /* CC capabilities (optional) */ if (ms->settings.cc_dtmf) { mncc.fields |= MNCC_F_CCCAP; -- To view, visit https://gerrit.osmocom.org/c/osmocom-bb/+/34810?usp=email To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmocom-bb Gerrit-Branch: master Gerrit-Change-Id: I3a5cac8c35ba6b7bdc5fcb077690b32848747756 Gerrit-Change-Number: 34810 Gerrit-PatchSet: 1 Gerrit-Owner: fixeria <vyanitskiy@sysmocom.de> Gerrit-MessageType: newchange