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Commit 3a7e3cb9 authored by Pavlin Radoslavov's avatar Pavlin Radoslavov
Browse files

Disable PAN Reverse Tethering when connection originated by the Remote 

* Check for valid interactions between the three PAN profile roles per
  Table 1 in PAN Profile v1.0 spec.
* Explicitly disable connections to the local PANU if the remote is
  not PANU.

Bug: 63145701
Test: External script
Change-Id: I29a7e404ba7e4453b6a7c59148a2b3eb7395303a
Merged-In: I29a7e404ba7e4453b6a7c59148a2b3eb7395303a
parent 436b7170

system/stack/pan/pan_main.cc

+33 −0
Original line number Diff line number Diff line
@@ -214,6 +214,39 @@ void pan_conn_ind_cb(uint16_t handle, BD_ADDR p_bda, tBT_UUID* remote_uuid, 
    return;

  }



  /* Check for valid interactions between the three PAN profile roles */

  /*

   * For reference, see Table 1 in PAN Profile v1.0 spec.

   * Note: the remote is the initiator.

   */

  bool is_valid_interaction = false;

  switch (remote_uuid->uu.uuid16) {

    case UUID_SERVCLASS_NAP:

    case UUID_SERVCLASS_GN:

      if (local_uuid->uu.uuid16 == UUID_SERVCLASS_PANU)

        is_valid_interaction = true;

      break;

    case UUID_SERVCLASS_PANU:

      is_valid_interaction = true;

      break;

  }

  /*

   * Explicitly disable connections to the local PANU if the remote is

   * not PANU.

   */

  if ((local_uuid->uu.uuid16 == UUID_SERVCLASS_PANU) &&

      (remote_uuid->uu.uuid16 != UUID_SERVCLASS_PANU)) {

    is_valid_interaction = false;

  }

  if (!is_valid_interaction) {

    PAN_TRACE_ERROR(

        "PAN Connection failed because of invalid PAN profile roles "

        "interaction: Remote UUID 0x%x Local UUID 0x%x",

        remote_uuid->uu.uuid16, local_uuid->uu.uuid16);

    BNEP_ConnectResp(handle, BNEP_CONN_FAILED_SRC_UUID);

    return;

  }



  /* Requested destination role is */

  if (local_uuid->uu.uuid16 == UUID_SERVCLASS_PANU)

    req_role = PAN_ROLE_CLIENT;