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Mon, 13 Apr 2026 03:41:48 -0700 (PDT) X-Received: by 2002:a17:902:76c3:b0:2b0:52b7:e82 with SMTP id d9443c01a7336-2b2d59a49fbmr99441815ad.16.1776076908452; Mon, 13 Apr 2026 03:41:48 -0700 (PDT) Received: from hu-nakella-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b2d4e0f909sm144495055ad.35.2026.04.13.03.41.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Apr 2026 03:41:48 -0700 (PDT) From: Naga Bhavani Akella To: linux-bluetooth@vger.kernel.org Cc: luiz.dentz@gmail.com, quic_mohamull@quicinc.com, quic_hbandi@quicinc.com, quic_anubhavg@quicinc.com, prathibha.madugonde@oss.qualcomm.com, Naga Bhavani Akella Subject: [PATCH BlueZ v4 2/3] bluetooth: Add Channel Sounding config parsing support Date: Mon, 13 Apr 2026 16:11:15 +0530 Message-Id: <20260413104116.1605357-3-naga.akella@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260413104116.1605357-1-naga.akella@oss.qualcomm.com> References: <20260413104116.1605357-1-naga.akella@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDEzMDEwMyBTYWx0ZWRfX+rBFm4AAnq1k bNZ0884RTOzgnKit3QsW9I3OSBB5jaPR4orqOP5cUYAVtpjGdVm+y0RviOI/oAjqm/avTBYIeDc M9MSyE/x2SgPH6/wAqipRAJ5v+uBZuNCUHoNJtVrAuCh0wjYUoI94OGlAcCPjSF+CZSS/KkuC3t n4ipvDRWfpMwEo18SRqaDAF0UMF7cP7WBWAbfO1ACv7Tsk+MgXr8oztecmwlTRuT9MNGDkhtQbL +tL8mtLODTU4ScsZxEhDCTPMSjPXuEpTUhFxPxFbfjRvs+sRt+SdDDElHl/P8/hO7HrZbFXnSMf 3Cf+gKHUVnS70n3IEoBZQWuBAT+2sNERoN/rn9vf/0dNsSTbtxs4FX8vC9t8gk5Sp7hAjuq29Tc cxkLO8WkDXOVd1mrt6i1CkXoFlu581Mtnub/AVoKqMP9dIrRhEoJ4cowJxcXr/R4JVn8YgM8Nze 7FyQUAiO34KFxHLL/dA== X-Proofpoint-ORIG-GUID: 65pJMg1O1577tYZIMRaS6kgQsgUdFFEs X-Proofpoint-GUID: 65pJMg1O1577tYZIMRaS6kgQsgUdFFEs X-Authority-Analysis: v=2.4 cv=d/LFDxjE c=1 sm=1 tr=0 ts=69dcc86e cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=FW10I0WjtUwoV23t3qsA:9 a=GvdueXVYPmCkWapjIL-Q:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-13_03,2026-04-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 malwarescore=0 phishscore=0 priorityscore=1501 bulkscore=0 suspectscore=0 adultscore=0 lowpriorityscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604130103 Add support for parsing Channel Sounding (CS) configuration options from the configuration file. Add CAP_NET_RAW to CapabilityBoundingSet in bluetooth.service. bluetoothd requires CAP_NET_RAW to receive and process HCI LE events when running under a constrained systemd capability bounding set --- src/bluetooth.service.in | 2 +- src/btd.h | 7 +++ src/main.c | 129 +++++++++++++++++++++++++++++++++++++++ src/main.conf | 24 ++++++++ 4 files changed, 161 insertions(+), 1 deletion(-) diff --git a/src/bluetooth.service.in b/src/bluetooth.service.in index 8ebe89bec..8dcbde236 100644 --- a/src/bluetooth.service.in +++ b/src/bluetooth.service.in @@ -10,7 +10,7 @@ ExecStart=@PKGLIBEXECDIR@/bluetoothd NotifyAccess=main #WatchdogSec=10 #Restart=on-failure -CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE +CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN CAP_NET_BIND_SERVICE LimitNPROC=1 # Filesystem lockdown diff --git a/src/btd.h b/src/btd.h index c84a600d1..db2e81239 100644 --- a/src/btd.h +++ b/src/btd.h @@ -94,11 +94,18 @@ struct btd_le_defaults { uint8_t enable_advmon_interleave_scan; }; +struct btd_le_bcs { + uint8_t role; + uint8_t cs_sync_ant_sel; + int8_t max_tx_power; +}; + struct btd_defaults { uint16_t num_entries; struct btd_br_defaults br; struct btd_le_defaults le; + struct btd_le_bcs bcs; }; struct btd_csis { diff --git a/src/main.c b/src/main.c index 818f7c06e..d3a2528e3 100644 --- a/src/main.c +++ b/src/main.c @@ -156,6 +156,13 @@ static const char *gatt_options[] = { NULL }; +static const char *bcs_options[] = { + "Role", + "CsSyncAntennaSel", + "MaxTxPower", + NULL +}; + static const char *csip_options[] = { "SIRK", "Encryption", @@ -193,6 +200,7 @@ static const struct group_table { { "CSIS", csip_options }, { "AVDTP", avdtp_options }, { "AVRCP", avrcp_options }, + { "ChannelSounding", bcs_options }, { "AdvMon", advmon_options }, { } }; @@ -492,6 +500,46 @@ static bool parse_config_int(GKeyFile *config, const char *group, return true; } +static bool parse_config_signed_int(GKeyFile *config, const char *group, + const char *key, int8_t *val, + size_t min, size_t max) +{ + char *str = NULL; + char *endptr = NULL; + long tmp; + bool result = false; + + str = g_key_file_get_string(config, group, key, NULL); + if (!str) + return false; + + tmp = strtol(str, &endptr, 0); + if (!endptr || *endptr != '\0') { + warn("%s.%s = %s is not integer", group, key, str); + goto cleanup; + } + + if (tmp < (long)min) { + warn("%s.%s = %ld is out of range (< %zu)", group, key, tmp, + min); + goto cleanup; + } + + if (tmp > (long)max) { + warn("%s.%s = %ld is out of range (> %zu)", group, key, tmp, + max); + goto cleanup; + } + + if (val) + *val = (int8_t)tmp; + result = true; + +cleanup: + g_free(str); + return result; +} + struct config_param { const char * const val_name; void * const val; @@ -1184,6 +1232,82 @@ static void parse_csis(GKeyFile *config) 0, UINT8_MAX); } +static bool parse_cs_role(GKeyFile *config, const char *group, + const char *key, uint8_t *val) +{ + GError *err = NULL; + char *str = NULL; + int numeric_val; + + /* Try to read as string first */ + str = g_key_file_get_string(config, group, key, &err); + if (err) { + if (err->code != G_KEY_FILE_ERROR_KEY_NOT_FOUND) + DBG("%s", err->message); + g_error_free(err); + return false; + } + + DBG("%s.%s = %s", group, key, str); + + /* Check if it's a string value */ + if (!strcmp(str, "Initiator") || !strcmp(str, "initiator")) { + if (val) + *val = 1; + g_free(str); + return true; + } else if (!strcmp(str, "Reflector") || !strcmp(str, "reflector")) { + if (val) + *val = 2; + g_free(str); + return true; + } else if (!strcmp(str, "Both") || !strcmp(str, "both")) { + if (val) + *val = 3; + g_free(str); + return true; + } + + /* Try to parse as numeric value */ + char *endptr = NULL; + + numeric_val = strtol(str, &endptr, 0); + + if (!endptr || *endptr != '\0') { + error("%s.%s = %s is not a valid value. " + "Expected: 1/Initiator, 2/Reflector, or 3/Both", + group, key, str); + g_free(str); + return false; + } + + if (numeric_val < 1 || numeric_val > 3) { + warn("%s.%s = %d is out of range. " + "Valid values: 1 (Initiator), 2 (Reflector), 3 (Both)", + group, key, numeric_val); + g_free(str); + return false; + } + + if (val) + *val = numeric_val; + + g_free(str); + return true; +} + +static void parse_le_cs_config(GKeyFile *config) +{ + parse_cs_role(config, "ChannelSounding", "Role", + &btd_opts.defaults.bcs.role); + parse_config_u8(config, "ChannelSounding", "CsSyncAntennaSel", + &btd_opts.defaults.bcs.cs_sync_ant_sel, + 0x01, 0xFF); + parse_config_signed_int(config, "ChannelSounding", + "MaxTxPower", &btd_opts.defaults.bcs.max_tx_power, + INT8_MIN, INT8_MAX); +} + static void parse_avdtp_session_mode(GKeyFile *config) { char *str = NULL; @@ -1262,6 +1386,7 @@ static void parse_config(GKeyFile *config) parse_csis(config); parse_avdtp(config); parse_avrcp(config); + parse_le_cs_config(config); parse_advmon(config); } @@ -1313,6 +1438,10 @@ static void init_defaults(void) btd_opts.advmon.rssi_sampling_period = 0xFF; btd_opts.csis.encrypt = true; + + btd_opts.defaults.bcs.role = 0x03; + btd_opts.defaults.bcs.cs_sync_ant_sel = 0xFF; + btd_opts.defaults.bcs.max_tx_power = 0x14; } static void log_handler(const gchar *log_domain, GLogLevelFlags log_level, diff --git a/src/main.conf b/src/main.conf index d31dd1b8f..fc0138bbf 100644 --- a/src/main.conf +++ b/src/main.conf @@ -299,6 +299,30 @@ # Default = auto # Security = auto +[ChannelSounding] +# Current role of the device +# Possible values: +# 1 or "Initiator" - CS Initiator role, +# Generally, CS Initiator acts as Client (Gatt role) and Central (Gap role) +# 2 or "Reflector" - CS Reflector role, +# Generally, CS Reflector acts as Server (Gatt role) and Peripheral (Gap role) +# 3 or "Both" - Both Initiator and Reflector roles +# Default: 3 (Both) +#Role = 3 + +# Antenna Identifier to be used +# Possible values: +# 0x01-0x04 (antenna identifier to be used), +# 0xFE - Antennas to be used in repetetive order, +# 0xFF - Host doen't have recommendation +# Default: 0xFF (Host doesn't have recommendation) +#CsSyncAntennaSel = 0xFF + +# Maximum Transmit power +# Possible values: 0x7F-0x14 (-127dBm to 20dBm) +# Default: 0x14 (Max Power possible) +#MaxTxPower = 0x14 + [CSIS] # SIRK - Set Identification Resolution Key which is common for all the # sets. They SIRK key is used to identify its sets. This can be any --