cregit-Linux how code gets into the kernel

Release 4.7 include/uapi/linux/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 */

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