[bluez/bluez] 88fd81: shared/hci: Add BPF filter for registered events

[Luiz Augusto von Dentz <noreply@github.com>]

  Branch: refs/heads/1088223
  Home:   https://github.com/bluez/bluez
  Commit: 88fd81c365dee91d3eaf97945282539636baf809
      https://github.com/bluez/bluez/commit/88fd81c365dee91d3eaf97945282539636baf809
  Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
  Date:   2026-04-30 (Thu, 30 Apr 2026)

  Changed paths:
    M src/shared/hci.c

  Log Message:
  -----------
  shared/hci: Add BPF filter for registered events

Implement a BPF socket filter in bt_hci_register/bt_hci_unregister that
uses setsockopt(SO_ATTACH_FILTER) to only accept HCI events that have
been registered, plus BT_HCI_EVT_CMD_COMPLETE and BT_HCI_EVT_CMD_STATUS
which are always needed for command response processing.

The filter is rebuilt each time an event is registered or unregistered,
and only applies to non-stream (raw socket) connections.

Assisted-by: Claude:claude-opus-4.6


  Commit: 576c56e190179d7cbecfa5b879705a79e847debf
      https://github.com/bluez/bluez/commit/576c56e190179d7cbecfa5b879705a79e847debf
  Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
  Date:   2026-04-30 (Thu, 30 Apr 2026)

  Changed paths:
    M src/shared/hci.c
    M src/shared/hci.h

  Log Message:
  -----------
  shared/hci: Add bt_hci_register_subevent for LE Meta events

Add bt_hci_register_subevent/bt_hci_unregister_subevent API that allows
registering for specific LE Meta Event subevents. The BPF filter is
extended to accept BT_HCI_EVT_LE_META_EVENT packets and then check the
subevent byte (offset 4) against registered subevents.

Since bt_hci_register_subevent is only used with BT_HCI_EVT_LE_META_EVENT,
the event parameter is omitted. The subevent list reuses struct evt where
evt->event stores the subevent code.

Assisted-by: Claude:claude-opus-4.6


  Commit: e6772a47c743ba2a3a84480dbd06b94346cfa74a
      https://github.com/bluez/bluez/commit/e6772a47c743ba2a3a84480dbd06b94346cfa74a
  Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
  Date:   2026-04-30 (Thu, 30 Apr 2026)

  Changed paths:
    M profiles/ranging/rap_hci.c

  Log Message:
  -----------
  ranging/rap_hci: Use bt_hci_register_subevent for LE CS events

Replace the single BT_HCI_EVT_LE_META_EVENT registration and subevent
dispatch table with individual bt_hci_register_subevent calls for each
CS subevent. This enables BPF filtering at the socket level for each
specific subevent and removes the manual subevent dispatch logic.

Event IDs are stored in a struct queue for flexible management.

Assisted-by: Claude:claude-opus-4.6


Compare: https://github.com/bluez/bluez/compare/88fd81c365de%5E...e6772a47c743

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