Bluetooth: RFCOMM: Handle non supported message types
If peer sends any non supported message then it has to be responded with NSC (Non Supported Command) response. > ACL Data RX: Handle 256 flags 0x02 dlen 18 Channel: 64 len 14 [PSM 3 mode 0] {chan 0} RFCOMM: Unnumbered Info with Header Check (UIH) (0xef) Address: 0x03 cr 1 dlci 0x00 Control: 0xef poll/final 0 Length: 10 FCS: 0x70 MCC Message type: Unknown CMD (0x33) Length: 8 01 22 34 55 67 88 9a bb 70 < ACL Data TX: Handle 256 flags 0x00 dlen 11 Channel: 64 len 7 [PSM 3 mode 0] {chan 0} RFCOMM: Unnumbered Info with Header Check (UIH) (0xef) Address: 0x01 cr 0 dlci 0x00 Control: 0xef poll/final 0 Length: 3 FCS: 0xaa MCC Message type: Non Supported Command RSP (0x04) Length: 1 cr 1, mcc_cmd_type 33 Change-Id: I7be3b64a9cf437276c10868d52e0b9c555018df0 Signed-off-by: Jaganath Kanakkassery <jaganathx.kanakkassery@intel.com>
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2 changed files with 18 additions and 0 deletions
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@ -634,6 +634,22 @@ static int rfcomm_send_test(struct bt_rfcomm_session *session, uint8_t cr,
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return bt_l2cap_chan_send(&session->br_chan.chan, buf);
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}
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static int rfcomm_send_nsc(struct bt_rfcomm_session *session, uint8_t cmd_type)
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{
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struct net_buf *buf;
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uint8_t fcs;
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buf = rfcomm_make_uih_msg(session, BT_RFCOMM_MSG_RESP_CR,
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BT_RFCOMM_NSC, sizeof(cmd_type));
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net_buf_add_u8(buf, cmd_type);
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fcs = rfcomm_calc_fcs(BT_RFCOMM_FCS_LEN_UIH, buf->data);
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net_buf_add_u8(buf, fcs);
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return bt_l2cap_chan_send(&session->br_chan.chan, buf);
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}
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static void rfcomm_dlc_connected(struct bt_rfcomm_dlc *dlc)
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{
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dlc->state = BT_RFCOMM_STATE_CONNECTED;
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@ -1127,6 +1143,7 @@ static void rfcomm_handle_msg(struct bt_rfcomm_session *session,
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break;
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default:
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BT_WARN("Unknown/Unsupported RFCOMM Msg type 0x%02x", msg_type);
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rfcomm_send_nsc(session, hdr->type);
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break;
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}
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}
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@ -95,6 +95,7 @@ struct bt_rfcomm_rpn {
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} __packed;
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#define BT_RFCOMM_TEST 0x08
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#define BT_RFCOMM_NSC 0x04
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/* Default RPN Settings */
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#define BT_RFCOMM_RPN_BAUD_RATE_9600 0x03
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