TLSEXT_TYPE_supported_groups
case TLSEXT_TYPE_supported_groups:
#define TLSEXT_TYPE_elliptic_curves TLSEXT_TYPE_supported_groups
.type = TLSEXT_TYPE_supported_groups,
if (!tlsext_extension_seen(s, TLSEXT_TYPE_supported_groups))
if (tlsext_extension_seen(s, TLSEXT_TYPE_supported_groups) !=