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Bluetooth: controller: implementing state check for ENC reply API

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Now checking that encryption procedure is in correct state to accept
a reply from host.

Signed-off-by: Erik Brockhoff <erbr@oticon.com>
This commit is contained in:
Erik Brockhoff 2022-04-26 14:48:05 +02:00 • committed by Carles Cufí
commit 025b9745d3
5 changed files with 21 additions and 22 deletions
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16
subsys/bluetooth/controller/ll_sw/ull_llcp.c
View file

@ -838,27 +838,31 @@ uint8_t ull_cp_data_length_update(struct ll_conn *conn, uint16_t max_tx_octets,
#endif /* CONFIG_BT_CTLR_DATA_LENGTH */
#if defined(CONFIG_BT_CTLR_LE_ENC)
void ull_cp_ltk_req_reply(struct ll_conn *conn, const uint8_t ltk[16])
uint8_t ull_cp_ltk_req_reply(struct ll_conn *conn, const uint8_t ltk[16])
{
/* TODO(thoh): Call rp_enc to query if LTK request reply is allowed */
struct proc_ctx *ctx;
ctx = llcp_rr_peek(conn);
if (ctx && (ctx->proc == PROC_ENCRYPTION_START || ctx->proc == PROC_ENCRYPTION_PAUSE)) {
if (ctx && (ctx->proc == PROC_ENCRYPTION_START || ctx->proc == PROC_ENCRYPTION_PAUSE) &&
llcp_rp_enc_ltk_req_reply_allowed(conn, ctx)) {
memcpy(ctx->data.enc.ltk, ltk, sizeof(ctx->data.enc.ltk));
llcp_rp_enc_ltk_req_reply(conn, ctx);
return BT_HCI_ERR_SUCCESS;
}
return BT_HCI_ERR_CMD_DISALLOWED;
}
void ull_cp_ltk_req_neq_reply(struct ll_conn *conn)
uint8_t ull_cp_ltk_req_neq_reply(struct ll_conn *conn)
{
/* TODO(thoh): Call rp_enc to query if LTK negative request reply is allowed */
struct proc_ctx *ctx;
ctx = llcp_rr_peek(conn);
if (ctx && (ctx->proc == PROC_ENCRYPTION_START || ctx->proc == PROC_ENCRYPTION_PAUSE)) {
if (ctx && (ctx->proc == PROC_ENCRYPTION_START || ctx->proc == PROC_ENCRYPTION_PAUSE) &&
llcp_rp_enc_ltk_req_reply_allowed(conn, ctx)) {
llcp_rp_enc_ltk_req_neg_reply(conn, ctx);
return BT_HCI_ERR_SUCCESS;
}
return BT_HCI_ERR_CMD_DISALLOWED;
}
#endif /* CONFIG_BT_CTLR_LE_ENC */

4
subsys/bluetooth/controller/ll_sw/ull_llcp.h
View file

@ -102,11 +102,11 @@ uint8_t ull_cp_encryption_paused(struct ll_conn *conn);
/**
*/
void ull_cp_ltk_req_reply(struct ll_conn *conn, const uint8_t ltk[16]);
uint8_t ull_cp_ltk_req_reply(struct ll_conn *conn, const uint8_t ltk[16]);
/**
*/
void ull_cp_ltk_req_neq_reply(struct ll_conn *conn);
uint8_t ull_cp_ltk_req_neq_reply(struct ll_conn *conn);
/**
* @brief Initiate a PHY Update Procedure.

5
subsys/bluetooth/controller/ll_sw/ull_llcp_enc.c
View file

@ -1200,6 +1200,11 @@ void llcp_rp_enc_ltk_req_neg_reply(struct ll_conn *conn, struct proc_ctx *ctx)
rp_enc_execute_fsm(conn, ctx, RP_ENC_EVT_LTK_REQ_NEG_REPLY, NULL);
}
bool llcp_rp_enc_ltk_req_reply_allowed(struct ll_conn *conn, struct proc_ctx *ctx)
{
return (ctx->state == RP_ENC_STATE_WAIT_LTK_REPLY);
}
void llcp_rp_enc_run(struct ll_conn *conn, struct proc_ctx *ctx, void *param)
{
rp_enc_execute_fsm(conn, ctx, RP_ENC_EVT_RUN, param);

2
subsys/bluetooth/controller/ll_sw/ull_llcp_internal.h
View file

@ -391,7 +391,9 @@ void llcp_rp_enc_rx(struct ll_conn *conn, struct proc_ctx *ctx, struct node_rx_p
void llcp_rp_enc_init_proc(struct proc_ctx *ctx);
void llcp_rp_enc_ltk_req_reply(struct ll_conn *conn, struct proc_ctx *ctx);
void llcp_rp_enc_ltk_req_neg_reply(struct ll_conn *conn, struct proc_ctx *ctx);
bool llcp_rp_enc_ltk_req_reply_allowed(struct ll_conn *conn, struct proc_ctx *ctx);
void llcp_rp_enc_run(struct ll_conn *conn, struct proc_ctx *ctx, void *param);
#endif /* CONFIG_BT_CTLR_LE_ENC */
#if defined(CONFIG_BT_CTLR_PHY)

16
subsys/bluetooth/controller/ll_sw/ull_peripheral.c
View file

@ -612,22 +612,10 @@ uint8_t ll_start_enc_req_send(uint16_t handle, uint8_t error_code,
conn->llcp.encryption.state = LLCP_ENC_STATE_INPROG;
}
#else /* CONFIG_BT_LL_SW_LLCP_LEGACY */
/*
* TODO: add info to the conn-structure
* - refresh
* - no procedure in progress
* - procedure type
* and use that info to decide if the cmd is allowed
* or if we should terminate the connection
* see BT 5.2 Vol. 6 part B chapter 5.1.3
* see also ull_periph.c line 395-439
*
* TODO: the ull_cp_ltx_req* functions should return success/fail status
*/
if (error_code) {
ull_cp_ltk_req_neq_reply(conn);
return ull_cp_ltk_req_neq_reply(conn);
} else {
ull_cp_ltk_req_reply(conn, ltk);
return ull_cp_ltk_req_reply(conn, ltk);
}
#endif /* CONFIG_BT_LL_SW_LLCP_LEGACY */