1. 根目录:
2. include
3. uapi
4. linux
5. atmbr2684.h

#ifndef _LINUX_ATMBR2684_H
#define _LINUX_ATMBR2684_H

#include <linux/types.h>
#include <linux/atm.h>
#include <linux/if.h>		/* For IFNAMSIZ */

/*
 * Type of media we're bridging (ethernet, token ring, etc)  Currently only
 * ethernet is supported
 */
#define BR2684_MEDIA_ETHERNET	(0)	/* 802.3 */
#define BR2684_MEDIA_802_4	(1)	/* 802.4 */
#define BR2684_MEDIA_TR		(2)	/* 802.5 - token ring */
#define BR2684_MEDIA_FDDI	(3)
#define BR2684_MEDIA_802_6	(4)	/* 802.6 */

					/* used only at device creation:  */
#define BR2684_FLAG_ROUTED	(1<<16)	/* payload is routed, not bridged */

/*
 * Is there FCS inbound on this VC?  This currently isn't supported.
 */
#define BR2684_FCSIN_NO		(0)
#define BR2684_FCSIN_IGNORE	(1)
#define BR2684_FCSIN_VERIFY	(2)

/*
 * Is there FCS outbound on this VC?  This currently isn't supported.
 */
#define BR2684_FCSOUT_NO	(0)
#define BR2684_FCSOUT_SENDZERO	(1)
#define BR2684_FCSOUT_GENERATE	(2)

/*
 * Does this VC include LLC encapsulation?
 */
#define BR2684_ENCAPS_VC	(0)	/* VC-mux */
#define BR2684_ENCAPS_LLC	(1)
#define BR2684_ENCAPS_AUTODETECT (2)	/* Unsuported */

/*
 * Is this VC bridged or routed?
 */

#define BR2684_PAYLOAD_ROUTED   (0)
#define BR2684_PAYLOAD_BRIDGED  (1)

/*
 * This is for the ATM_NEWBACKENDIF call - these are like socket families:
 * the first element of the structure is the backend number and the rest
 * is per-backend specific
 */
struct atm_newif_br2684 {
	atm_backend_t backend_num;	/* ATM_BACKEND_BR2684 */
	int media;		/* BR2684_MEDIA_*, flags in upper bits */
	char ifname[IFNAMSIZ];
	int mtu;
};

/*
 * This structure is used to specify a br2684 interface - either by a
 * positive integer (returned by ATM_NEWBACKENDIF) or the interfaces name
 */
#define BR2684_FIND_BYNOTHING	(0)
#define BR2684_FIND_BYNUM	(1)
#define BR2684_FIND_BYIFNAME	(2)
struct br2684_if_spec {
	int method;		/* BR2684_FIND_* */
	union {
		char ifname[IFNAMSIZ];
		int devnum;
	} spec;
};

/*
 * This is for the ATM_SETBACKEND call - these are like socket families:
 * the first element of the structure is the backend number and the rest
 * is per-backend specific
 */
struct atm_backend_br2684 {
	atm_backend_t backend_num;	/* ATM_BACKEND_BR2684 */
	struct br2684_if_spec ifspec;
	int fcs_in;		/* BR2684_FCSIN_* */
	int fcs_out;		/* BR2684_FCSOUT_* */
	int fcs_auto;		/* 1: fcs_{in,out} disabled if no FCS rx'ed */
	int encaps;		/* BR2684_ENCAPS_* */
	int has_vpiid;		/* 1: use vpn_id - Unsupported */
	__u8 vpn_id[7];
	int send_padding;	/* unsupported */
	int min_size;		/* we will pad smaller packets than this */
};

/*
 * The BR2684_SETFILT ioctl is an experimental mechanism for folks
 * terminating a large number of IP-only vcc's.  When netfilter allows
 * efficient per-if in/out filters, this support will be removed
 */
struct br2684_filter {
	__be32 prefix;		/* network byte order */
	__be32 netmask;		/* 0 = disable filter */
};

struct br2684_filter_set {
	struct br2684_if_spec ifspec;
	struct br2684_filter filter;
};

enum br2684_payload {
	p_routed = BR2684_PAYLOAD_ROUTED,
	p_bridged = BR2684_PAYLOAD_BRIDGED,
};

#define BR2684_SETFILT	_IOW( 'a', ATMIOC_BACKEND + 0, \
				struct br2684_filter_set)

#endif /* _LINUX_ATMBR2684_H */