diff options
Diffstat (limited to 'xdlc.h')
| -rw-r--r-- | xdlc.h | 71 |
1 files changed, 60 insertions, 11 deletions
@@ -2,13 +2,12 @@ * Define *DLC frame types, and routine to dissect the control field of * a *DLC frame. * - * $Id: xdlc.h,v 1.18 2003/09/02 19:18:52 guy Exp $ + * $Id: xdlc.h,v 1.19 2004/01/03 03:49:23 guy Exp $ * * Ethereal - Network traffic analyzer - * By Gerald Combs <gerald@zing.org> + * By Gerald Combs <gerald@ethereal.com> * Copyright 1998 Gerald Combs * - * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 @@ -31,9 +30,38 @@ * Low-order bits of first (extended) or only (basic) octet of control * field, specifying the frame type. */ -#define XDLC_I 0x00 /* Information frames */ -#define XDLC_S 0x01 /* Supervisory frames */ -#define XDLC_U 0x03 /* Unnumbered frames */ +#define XDLC_I_MASK 0x01 /* Mask to test for I or not I */ +#define XDLC_I 0x00 /* Information frames */ +#define XDLC_S_U_MASK 0x03 /* Mask to test for S or U */ +#define XDLC_S 0x01 /* Supervisory frames */ +#define XDLC_U 0x03 /* Unnumbered frames */ + +/* + * N(S) and N(R) fields, in basic and extended operation. + */ +#define XDLC_N_R_MASK 0xE0 /* basic */ +#define XDLC_N_R_SHIFT 5 +#define XDLC_N_R_EXT_MASK 0xFE00 /* extended */ +#define XDLC_N_R_EXT_SHIFT 9 +#define XDLC_N_S_MASK 0x0E /* basic */ +#define XDLC_N_S_SHIFT 1 +#define XDLC_N_S_EXT_MASK 0x00FE /* extended */ +#define XDLC_N_S_EXT_SHIFT 1 + +/* + * Poll/Final bit, in basic and extended operation. + */ +#define XDLC_P_F 0x10 /* basic */ +#define XDLC_P_F_EXT 0x0100 /* extended */ + +/* + * S-format frame types. + */ +#define XDLC_S_FTYPE_MASK 0x0C +#define XDLC_RR 0x00 /* Receiver ready */ +#define XDLC_RNR 0x04 /* Receiver not ready */ +#define XDLC_REJ 0x08 /* Reject */ +#define XDLC_SREJ 0x0C /* Selective reject */ /* * U-format modifiers. @@ -68,7 +96,7 @@ * e.g. TEST frames. */ #define XDLC_IS_INFORMATION(control) \ - (((control) & 0x1) == XDLC_I || (control) == (XDLC_UI|XDLC_U)) + (((control) & XDLC_I_MASK) == XDLC_I || (control) == (XDLC_UI|XDLC_U)) /* * This macro takes the control field of an xDLC frame, and a flag saying @@ -77,13 +105,34 @@ * in extended mode, it's 1 byte long, otherwise it's 2 bytes long). */ #define XDLC_CONTROL_LEN(control, is_extended) \ - ((((control) & 0x3) == XDLC_U || !(is_extended)) ? 1 : 2) + ((((control) & XDLC_S_U_MASK) == XDLC_U || !(is_extended)) ? 1 : 2) + +/* + * Structure containing pointers to hf_ values for various subfields of + * the control field. + */ +typedef struct { + int *hf_xdlc_n_r; + int *hf_xdlc_n_s; + int *hf_xdlc_p; + int *hf_xdlc_f; + int *hf_xdlc_s_ftype; + int *hf_xdlc_u_modifier_cmd; + int *hf_xdlc_u_modifier_resp; + int *hf_xdlc_ftype_i; + int *hf_xdlc_ftype_s_u; +} xdlc_cf_items; + +extern const value_string ftype_vals[]; +extern const value_string stype_vals[]; +extern const value_string modifier_vals_cmd[]; +extern const value_string modifier_vals_resp[]; -int get_xdlc_control(const guchar *pd, int offset, - int extended); +extern int get_xdlc_control(const guchar *pd, int offset, int extended); -int dissect_xdlc_control(tvbuff_t *tvb, int offset, packet_info *pinfo, +extern int dissect_xdlc_control(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *xdlc_tree, int hf_xdlc_control, gint ett_xdlc_control, + const xdlc_cf_items *cf_items_nonext, const xdlc_cf_items *cf_items_ext, int is_response, int extended, int append_info); #endif |