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[34.80.71.174]) by smtp.gmail.com with UTF8SMTPSA id 14sm5663789pjh.45.2022.01.27.02.18.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Jan 2022 02:18:04 -0800 (PST) From: Joseph Hwang To: linux-bluetooth@vger.kernel.org, marcel@holtmann.org, luiz.dentz@gmail.com, pali@kernel.org Cc: chromeos-bluetooth-upstreaming@chromium.org, josephsih@google.com, Joseph Hwang , Archie Pusaka , "David S. Miller" , Jakub Kicinski , Johan Hedberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v2 1/2] Bluetooth: aosp: surface AOSP quality report through mgmt Date: Thu, 27 Jan 2022 18:17:58 +0800 Message-Id: <20220127181738.v2.1.I2015b42d2d0a502334c9c3a2983438b89716d4f0@changeid> X-Mailer: git-send-email 2.35.0.rc0.227.g00780c9af4-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org When receiving a HCI vendor event, the kernel checks if it is an AOSP bluetooth quality report. If yes, the event is sent to bluez user space through the mgmt socket. Signed-off-by: Joseph Hwang Reviewed-by: Archie Pusaka --- Changes in v2: - Scrap the two structures defined in aosp.c and use constants for size check. - Do a basic size check about the quality report event. Do not pull data from the event in which the kernel has no interest. - Define vendor event prefixes with which vendor events of distinct vendor specifications can be clearly differentiated. - Use mgmt helpers to add the header and data to a mgmt skb. include/net/bluetooth/hci_core.h | 2 + include/net/bluetooth/mgmt.h | 7 +++ net/bluetooth/aosp.c | 19 +++++++ net/bluetooth/aosp.h | 6 ++ net/bluetooth/hci_event.c | 96 +++++++++++++++++++++++++++++++- net/bluetooth/mgmt.c | 19 +++++++ net/bluetooth/msft.c | 14 +++++ net/bluetooth/msft.h | 12 ++++ 8 files changed, 174 insertions(+), 1 deletion(-) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 21eadb113a31..b726fd595895 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -1861,6 +1861,8 @@ int mgmt_add_adv_patterns_monitor_complete(struct hci_dev *hdev, u8 status); int mgmt_remove_adv_monitor_complete(struct hci_dev *hdev, u8 status); void mgmt_adv_monitor_device_lost(struct hci_dev *hdev, u16 handle, bdaddr_t *bdaddr, u8 addr_type); +int mgmt_quality_report(struct hci_dev *hdev, void *data, u32 data_len, + u8 quality_spec); u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency, u16 to_multiplier); diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h index 99266f7aebdc..03204b4ba641 100644 --- a/include/net/bluetooth/mgmt.h +++ b/include/net/bluetooth/mgmt.h @@ -1120,3 +1120,10 @@ struct mgmt_ev_adv_monitor_device_lost { __le16 monitor_handle; struct mgmt_addr_info addr; } __packed; + +#define MGMT_EV_QUALITY_REPORT 0x0031 +struct mgmt_ev_quality_report { + __u8 quality_spec; + __u32 data_len; + __u8 data[]; +} __packed; diff --git a/net/bluetooth/aosp.c b/net/bluetooth/aosp.c index 432ae3aac9e3..9ec845a098bd 100644 --- a/net/bluetooth/aosp.c +++ b/net/bluetooth/aosp.c @@ -199,3 +199,22 @@ int aosp_set_quality_report(struct hci_dev *hdev, bool enable) else return disable_quality_report(hdev); } + +#define BLUETOOTH_QUALITY_REPORT_EV 0x58 + +/* The following LEN = 1-byte Sub-event code + 48-byte Sub-event Parameters */ +#define BLUETOOTH_QUALITY_REPORT_LEN 49 + +bool aosp_check_quality_report_len(struct sk_buff *skb) +{ + /* skb->len is allowed to be larger than BLUETOOTH_QUALITY_REPORT_LEN + * to accommodate an additional Vendor Specific Parameter (vsp) field. + */ + if (skb->len < BLUETOOTH_QUALITY_REPORT_LEN) { + BT_ERR("AOSP evt data len %d too short (%u expected)", + skb->len, BLUETOOTH_QUALITY_REPORT_LEN); + return false; + } + + return true; +} diff --git a/net/bluetooth/aosp.h b/net/bluetooth/aosp.h index 2fd8886d51b2..fdb6264b8ea7 100644 --- a/net/bluetooth/aosp.h +++ b/net/bluetooth/aosp.h @@ -10,6 +10,7 @@ void aosp_do_close(struct hci_dev *hdev); bool aosp_has_quality_report(struct hci_dev *hdev); int aosp_set_quality_report(struct hci_dev *hdev, bool enable); +bool aosp_check_quality_report_len(struct sk_buff *skb); #else @@ -26,4 +27,9 @@ static inline int aosp_set_quality_report(struct hci_dev *hdev, bool enable) return -EOPNOTSUPP; } +static inline bool aosp_check_quality_report_len(struct sk_buff *skb) +{ + return false; +} + #endif diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 681c623aa380..1b69d3efd415 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -37,6 +37,7 @@ #include "smp.h" #include "msft.h" #include "eir.h" +#include "aosp.h" #define ZERO_KEY "\x00\x00\x00\x00\x00\x00\x00\x00" \ "\x00\x00\x00\x00\x00\x00\x00\x00" @@ -4225,6 +4226,99 @@ static void hci_num_comp_blocks_evt(struct hci_dev *hdev, void *data, queue_work(hdev->workqueue, &hdev->tx_work); } +#define QUALITY_SPEC_NA 0x0 +#define QUALITY_SPEC_INTEL_TELEMETRY 0x1 +#define QUALITY_SPEC_AOSP_BQR 0x2 + +static void aosp_quality_report_evt(struct hci_dev *hdev, void *data, + struct sk_buff *skb) +{ + if (aosp_has_quality_report(hdev) && aosp_check_quality_report_len(skb)) + mgmt_quality_report(hdev, skb->data, skb->len, + QUALITY_SPEC_AOSP_BQR); +} + +/* Define the fixed vendor event prefixes below. + * Note: AOSP HCI Requirements use 0x54 and up as sub-event codes without + * actually defining a vendor prefix. Refer to + * https://source.android.com/devices/bluetooth/hci_requirements + * Hence, the other vendor event prefixes should not use the same + * space to avoid collision. + */ +static unsigned char AOSP_BQR_PREFIX[] = { 0x58 }; + +/* Some vendor prefixes are fixed values and lengths. */ +#define FIXED_EVT_PREFIX(_prefix, _vendor_func) \ +{ \ + .prefix = _prefix, \ + .prefix_len = sizeof(_prefix), \ + .vendor_func = _vendor_func, \ + .get_prefix = NULL, \ + .get_prefix_len = NULL, \ +} + +/* Some vendor prefixes are only available at run time. The + * values and lengths are variable. + */ +#define DYNAMIC_EVT_PREFIX(_prefix_func, _prefix_len_func, _vendor_func)\ +{ \ + .prefix = NULL, \ + .prefix_len = 0, \ + .vendor_func = _vendor_func, \ + .get_prefix = _prefix_func, \ + .get_prefix_len = _prefix_len_func, \ +} + +/* Every distinct vendor specification must have a well-defined vendor + * event prefix to determine if a vendor event meets the specification. + * If an event prefix is fixed, it should be delcared with FIXED_EVT_PREFIX. + * Otherwise, DYNAMIC_EVT_PREFIX should be used for variable prefixes. + */ +struct vendor_event_prefix { + __u8 *prefix; + __u8 prefix_len; + void (*vendor_func)(struct hci_dev *hdev, void *data, + struct sk_buff *skb); + __u8 *(*get_prefix)(struct hci_dev *hdev); + __u8 (*get_prefix_len)(struct hci_dev *hdev); +} evt_prefixes[] = { + FIXED_EVT_PREFIX(AOSP_BQR_PREFIX, aosp_quality_report_evt), + DYNAMIC_EVT_PREFIX(get_msft_evt_prefix, get_msft_evt_prefix_len, + msft_vendor_evt), + + /* end with a null entry */ + {}, +}; + +static void hci_vendor_evt(struct hci_dev *hdev, void *data, + struct sk_buff *skb) +{ + int i; + __u8 *prefix; + __u8 prefix_len; + + for (i = 0; evt_prefixes[i].vendor_func; i++) { + if (evt_prefixes[i].get_prefix) + prefix = evt_prefixes[i].get_prefix(hdev); + else + prefix = evt_prefixes[i].prefix; + + if (evt_prefixes[i].get_prefix_len) + prefix_len = evt_prefixes[i].get_prefix_len(hdev); + else + prefix_len = evt_prefixes[i].prefix_len; + + if (!prefix || prefix_len == 0) + continue; + + /* Compare the raw prefix data directly. */ + if (!memcmp(prefix, skb->data, prefix_len)) { + evt_prefixes[i].vendor_func(hdev, data, skb); + break; + } + } +} + static void hci_mode_change_evt(struct hci_dev *hdev, void *data, struct sk_buff *skb) { @@ -6811,7 +6905,7 @@ static const struct hci_ev { HCI_EV(HCI_EV_NUM_COMP_BLOCKS, hci_num_comp_blocks_evt, sizeof(struct hci_ev_num_comp_blocks)), /* [0xff = HCI_EV_VENDOR] */ - HCI_EV(HCI_EV_VENDOR, msft_vendor_evt, 0), + HCI_EV(HCI_EV_VENDOR, hci_vendor_evt, 0), }; static void hci_event_func(struct hci_dev *hdev, u8 event, struct sk_buff *skb, diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 08d6494f1b34..5388018cd738 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -4389,6 +4389,25 @@ static int set_exp_feature(struct sock *sk, struct hci_dev *hdev, MGMT_STATUS_NOT_SUPPORTED); } +int mgmt_quality_report(struct hci_dev *hdev, void *data, u32 data_len, + u8 quality_spec) +{ + struct mgmt_ev_quality_report *ev; + struct sk_buff *skb; + + skb = mgmt_alloc_skb(hdev, MGMT_EV_QUALITY_REPORT, + sizeof(*ev) + data_len); + if (!skb) + return -ENOMEM; + + ev = skb_put(skb, sizeof(*ev)); + ev->quality_spec = quality_spec; + ev->data_len = data_len; + skb_put_data(skb, data, data_len); + + return mgmt_event_skb(skb, NULL); +} + static int get_device_flags(struct sock *sk, struct hci_dev *hdev, void *data, u16 data_len) { diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c index 484540855863..92fd7fca5889 100644 --- a/net/bluetooth/msft.c +++ b/net/bluetooth/msft.c @@ -729,6 +729,20 @@ static void msft_monitor_device_evt(struct hci_dev *hdev, struct sk_buff *skb) handle_data->mgmt_handle); } +__u8 *get_msft_evt_prefix(struct hci_dev *hdev) +{ + struct msft_data *msft = hdev->msft_data; + + return msft->evt_prefix; +} + +__u8 get_msft_evt_prefix_len(struct hci_dev *hdev) +{ + struct msft_data *msft = hdev->msft_data; + + return msft->evt_prefix_len; +} + void msft_vendor_evt(struct hci_dev *hdev, void *data, struct sk_buff *skb) { struct msft_data *msft = hdev->msft_data; diff --git a/net/bluetooth/msft.h b/net/bluetooth/msft.h index afcaf7d3b1cb..a354ebf61fed 100644 --- a/net/bluetooth/msft.h +++ b/net/bluetooth/msft.h @@ -27,6 +27,8 @@ int msft_set_filter_enable(struct hci_dev *hdev, bool enable); int msft_suspend_sync(struct hci_dev *hdev); int msft_resume_sync(struct hci_dev *hdev); bool msft_curve_validity(struct hci_dev *hdev); +__u8 *get_msft_evt_prefix(struct hci_dev *hdev); +__u8 get_msft_evt_prefix_len(struct hci_dev *hdev); #else @@ -77,4 +79,14 @@ static inline bool msft_curve_validity(struct hci_dev *hdev) return false; } +static inline __u8 *get_msft_evt_prefix(struct hci_dev *hdev) +{ + return NULL; +} + +static inline __u8 get_msft_evt_prefix_len(struct hci_dev *hdev) +{ + return 0; +} + #endif