From 40f66c05c360777e847033ddbe076d88123719d1 Mon Sep 17 00:00:00 2001 From: Johan Hedberg Date: Tue, 7 Apr 2015 21:52:22 +0300 Subject: [PATCH] Bluetooth: Add local SSP OOB data to OOB ext data mgmt command The Read Local Out Of Band Extended Data mgmt command is specified to return the SSP values when given a BR/EDR address type as input parameter. The returned values may include either the 192-bit variants of C and R, or their 256-bit variants, or both, depending on the status of Secure Connections and Secure Connections Only modes. If SSP is not enabled the command will only return the Class of Device value (like it has done so far). Signed-off-by: Johan Hedberg Signed-off-by: Marcel Holtmann --- net/bluetooth/mgmt.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 152 insertions(+), 2 deletions(-) diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 845dfcc..7fd87e7 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -6466,6 +6466,145 @@ static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type, u8 *data, return eir_len; } +static void read_local_oob_ext_data_complete(struct hci_dev *hdev, u8 status, + u16 opcode, struct sk_buff *skb) +{ + const struct mgmt_cp_read_local_oob_ext_data *mgmt_cp; + struct mgmt_rp_read_local_oob_ext_data *mgmt_rp; + u8 *h192, *r192, *h256, *r256; + struct mgmt_pending_cmd *cmd; + u16 eir_len; + int err; + + BT_DBG("%s status %u", hdev->name, status); + + cmd = pending_find(MGMT_OP_READ_LOCAL_OOB_EXT_DATA, hdev); + if (!cmd) + return; + + mgmt_cp = cmd->param; + + if (status) { + status = mgmt_status(status); + eir_len = 0; + + h192 = NULL; + r192 = NULL; + h256 = NULL; + r256 = NULL; + } else if (opcode == HCI_OP_READ_LOCAL_OOB_DATA) { + struct hci_rp_read_local_oob_data *rp; + + if (skb->len != sizeof(*rp)) { + status = MGMT_STATUS_FAILED; + eir_len = 0; + } else { + status = MGMT_STATUS_SUCCESS; + rp = (void *)skb->data; + + eir_len = 5 + 18 + 18; + h192 = rp->hash; + r192 = rp->rand; + h256 = NULL; + r256 = NULL; + } + } else { + struct hci_rp_read_local_oob_ext_data *rp; + + if (skb->len != sizeof(*rp)) { + status = MGMT_STATUS_FAILED; + eir_len = 0; + } else { + status = MGMT_STATUS_SUCCESS; + rp = (void *)skb->data; + + if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) { + eir_len = 5 + 18 + 18; + h192 = NULL; + r192 = NULL; + } else { + eir_len = 5 + 18 + 18 + 18 + 18; + h192 = rp->hash192; + r192 = rp->rand192; + } + + h256 = rp->hash256; + r256 = rp->rand256; + } + } + + mgmt_rp = kmalloc(sizeof(*mgmt_rp) + eir_len, GFP_KERNEL); + if (!mgmt_rp) + goto done; + + if (status) + goto send_rsp; + + eir_len = eir_append_data(mgmt_rp->eir, 0, EIR_CLASS_OF_DEV, + hdev->dev_class, 3); + + if (h192 && r192) { + eir_len = eir_append_data(mgmt_rp->eir, eir_len, + EIR_SSP_HASH_C192, h192, 16); + eir_len = eir_append_data(mgmt_rp->eir, eir_len, + EIR_SSP_RAND_R192, r192, 16); + } + + if (h256 && r256) { + eir_len = eir_append_data(mgmt_rp->eir, eir_len, + EIR_SSP_HASH_C256, h256, 16); + eir_len = eir_append_data(mgmt_rp->eir, eir_len, + EIR_SSP_RAND_R256, r256, 16); + } + +send_rsp: + mgmt_rp->type = mgmt_cp->type; + mgmt_rp->eir_len = cpu_to_le16(eir_len); + + err = mgmt_cmd_complete(cmd->sk, hdev->id, + MGMT_OP_READ_LOCAL_OOB_EXT_DATA, status, + mgmt_rp, sizeof(*mgmt_rp) + eir_len); + if (err < 0 || status) + goto done; + + hci_sock_set_flag(cmd->sk, HCI_MGMT_OOB_DATA_EVENTS); + + err = mgmt_limited_event(MGMT_EV_LOCAL_OOB_DATA_UPDATED, hdev, + mgmt_rp, sizeof(*mgmt_rp) + eir_len, + HCI_MGMT_OOB_DATA_EVENTS, cmd->sk); +done: + kfree(mgmt_rp); + mgmt_pending_remove(cmd); +} + +static int read_local_ssp_oob_req(struct hci_dev *hdev, struct sock *sk, + struct mgmt_cp_read_local_oob_ext_data *cp) +{ + struct mgmt_pending_cmd *cmd; + struct hci_request req; + int err; + + cmd = mgmt_pending_add(sk, MGMT_OP_READ_LOCAL_OOB_EXT_DATA, hdev, + cp, sizeof(*cp)); + if (!cmd) + return -ENOMEM; + + hci_req_init(&req, hdev); + + if (bredr_sc_enabled(hdev)) + hci_req_add(&req, HCI_OP_READ_LOCAL_OOB_EXT_DATA, 0, NULL); + else + hci_req_add(&req, HCI_OP_READ_LOCAL_OOB_DATA, 0, NULL); + + err = hci_req_run_skb(&req, read_local_oob_ext_data_complete); + if (err < 0) { + mgmt_pending_remove(cmd); + return err; + } + + return 0; +} + static int read_local_oob_ext_data(struct sock *sk, struct hci_dev *hdev, void *data, u16 data_len) { @@ -6517,8 +6656,19 @@ static int read_local_oob_ext_data(struct sock *sk, struct hci_dev *hdev, eir_len = 0; switch (cp->type) { case BIT(BDADDR_BREDR): - eir_len = eir_append_data(rp->eir, eir_len, EIR_CLASS_OF_DEV, - hdev->dev_class, 3); + if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) { + err = read_local_ssp_oob_req(hdev, sk, cp); + hci_dev_unlock(hdev); + if (!err) + goto done; + + status = MGMT_STATUS_FAILED; + goto complete; + } else { + eir_len = eir_append_data(rp->eir, eir_len, + EIR_CLASS_OF_DEV, + hdev->dev_class, 3); + } break; case (BIT(BDADDR_LE_PUBLIC) | BIT(BDADDR_LE_RANDOM)): if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) && -- 2.7.4