Re: [PATCH] Add support to hcidump for parsing Enhanced L2CAP configuration options

[Marcel Holtmann <marcel@holtmann.org>]

Hi Nathan,

> This allows hcidump to parse the FCS and other options that are used to
> negotiate an Enhanced Retransmission or Streaming mode L2CAP connection.
>     
> I've add an #indef L2CAP_CONF_FCS to the top of the code which mirrors
> a change under the kernel headers to allow building on systems without
> the modified kernel headers.

this needs to be submitted against libbluetooth. I just added that value
to it.

> ---
>  l2cap.c |   19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/parser/l2cap.c b/parser/l2cap.c
> index a906f42..64839f5 100644
> --- a/parser/l2cap.c
> +++ b/parser/l2cap.c
> @@ -65,6 +65,10 @@ static cid_info cid_table[2][CID_TABLE_SIZE];
>  #define SCID cid_table[0]
>  #define DCID cid_table[1]
>  
> +#ifndef L2CAP_CONF_FCS
> +#define L2CAP_CONF_FCS 0x05
> +#endif
> +
>  static struct frame *add_handle(uint16_t handle)
>  {
>  	register handle_info *t = handle_table;
> @@ -306,6 +310,10 @@ static char *mode2str(uint8_t mode)
>  		return "Retransmission";
>  	case 0x02:
>  		return "Flow control";
> +	case 0x03:
> +		return "Enhanced Retransmission";
> +	case 0x04:
> +		return "Streaming";
>  	default:
>  		return "Reserved";
>  	}
> @@ -428,7 +436,7 @@ static void conf_rfc(void *ptr, int len, int in,
> uint16_t cid)
>  	set_mode(in, cid, mode);
>  
>  	printf("RFC 0x%02x (%s", mode, mode2str(mode));
> -	if (mode == 0x01 || mode == 0x02) {
> +	if (mode >= 0x01 && mode <= 0x08) {
>  		uint8_t txwin, maxtrans;
>  		uint16_t rto, mto, mps;
>  		txwin = *((uint8_t *) (ptr + 1));
> @@ -478,6 +486,12 @@ static void conf_opt(int level, void *ptr, int len,
> int in, uint16_t cid)
>  			conf_rfc(h->val, h->len, in, cid);
>  			break;
>  
> +		case L2CAP_CONF_FCS:
> +			printf("FCS Option");
> +			if (h->len > 0);
> +				printf(" 0x%x", get_val(h->val, h->len));
> +			break;
> +
>  		default:
>  			printf("Unknown (type %2.2x, len %d)", h->type & 0x7f, h->len);
>  			break;
> @@ -510,6 +524,9 @@ static void conf_list(int level, uint8_t *list, int
> len)
>  		case L2CAP_CONF_RFC:
>  			printf("RFC ");
>  			break;
> +		case L2CAP_CONF_FCS:
> +			printf("FCS Option");
> +			break;

please add proper parsing of FCS Option here. And of course if has to
have an extra " " at the end.

Regards

Marcel