cregit-Linux how code gets into the kernel

Release 4.7 include/uapi/linux/mroute6.h

#ifndef _UAPI__LINUX_MROUTE6_H

#define _UAPI__LINUX_MROUTE6_H

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sockios.h>

/*
 *      Based on the MROUTING 3.5 defines primarily to keep
 *      source compatibility with BSD.
 *
 *      See the pim6sd code for the original history.
 *
 *      Protocol Independent Multicast (PIM) data structures included
 *      Carlos Picoto (cap@di.fc.ul.pt)
 *
 */


#define MRT6_BASE	200

#define MRT6_INIT	(MRT6_BASE)	
/* Activate the kernel mroute code      */

#define MRT6_DONE	(MRT6_BASE+1)	
/* Shutdown the kernel mroute           */

#define MRT6_ADD_MIF	(MRT6_BASE+2)	
/* Add a virtual interface              */

#define MRT6_DEL_MIF	(MRT6_BASE+3)	
/* Delete a virtual interface           */

#define MRT6_ADD_MFC	(MRT6_BASE+4)	
/* Add a multicast forwarding entry     */

#define MRT6_DEL_MFC	(MRT6_BASE+5)	
/* Delete a multicast forwarding entry  */

#define MRT6_VERSION	(MRT6_BASE+6)	
/* Get the kernel multicast version     */

#define MRT6_ASSERT	(MRT6_BASE+7)	
/* Activate PIM assert mode             */

#define MRT6_PIM	(MRT6_BASE+8)	
/* enable PIM code                      */

#define MRT6_TABLE	(MRT6_BASE+9)	
/* Specify mroute table ID              */

#define MRT6_ADD_MFC_PROXY	(MRT6_BASE+10)	
/* Add a (*,*|G) mfc entry      */

#define MRT6_DEL_MFC_PROXY	(MRT6_BASE+11)	
/* Del a (*,*|G) mfc entry      */

#define MRT6_MAX	(MRT6_BASE+11)


#define SIOCGETMIFCNT_IN6	SIOCPROTOPRIVATE	
/* IP protocol privates */

#define SIOCGETSGCNT_IN6	(SIOCPROTOPRIVATE+1)

#define SIOCGETRPF	(SIOCPROTOPRIVATE+2)


#define MAXMIFS		32

typedef unsigned long mifbitmap_t;	
/* User mode code depends on this lot */

typedef unsigned short mifi_t;

#define ALL_MIFS	((mifi_t)(-1))

#ifndef IF_SETSIZE

#define IF_SETSIZE	256
#endif


typedef	__u32		if_mask;

#define NIFBITS (sizeof(if_mask) * 8)        
/* bits per mask */


typedef struct if_set {
	
if_mask ifs_bits[__KERNEL_DIV_ROUND_UP(IF_SETSIZE, NIFBITS)];
} 
if_set;


#define IF_SET(n, p)    ((p)->ifs_bits[(n)/NIFBITS] |= (1 << ((n) % NIFBITS)))

#define IF_CLR(n, p)    ((p)->ifs_bits[(n)/NIFBITS] &= ~(1 << ((n) % NIFBITS)))

#define IF_ISSET(n, p)  ((p)->ifs_bits[(n)/NIFBITS] & (1 << ((n) % NIFBITS)))

#define IF_COPY(f, t)   bcopy(f, t, sizeof(*(f)))

#define IF_ZERO(p)      bzero(p, sizeof(*(p)))

/*
 *      Passed by mrouted for an MRT_ADD_MIF - again we use the
 *      mrouted 3.6 structures for compatibility
 */


struct mif6ctl {
	
mifi_t	mif6c_mifi;		/* Index of MIF */
	
unsigned char mif6c_flags;	/* MIFF_ flags */
	
unsigned char vifc_threshold;	/* ttl limit */
	
__u16	 mif6c_pifi;		/* the index of the physical IF */
	
unsigned int vifc_rate_limit;	/* Rate limiter values (NI) */
};


#define MIFF_REGISTER	0x1	
/* register vif */

/*
 *      Cache manipulation structures for mrouted and PIMd
 */


struct mf6cctl {
	
struct sockaddr_in6 mf6cc_origin;		/* Origin of mcast      */
	
struct sockaddr_in6 mf6cc_mcastgrp;		/* Group in question    */
	
mifi_t	mf6cc_parent;			/* Where it arrived     */
	
struct if_set mf6cc_ifset;		/* Where it is going */
};

/*
 *      Group count retrieval for pim6sd
 */


struct sioc_sg_req6 {
	
struct sockaddr_in6 src;
	
struct sockaddr_in6 grp;
	
unsigned long pktcnt;
	
unsigned long bytecnt;
	
unsigned long wrong_if;
};

/*
 *      To get vif packet counts
 */


struct sioc_mif_req6 {
	
mifi_t	mifi;		/* Which iface */
	
unsigned long icount;	/* In packets */
	
unsigned long ocount;	/* Out packets */
	
unsigned long ibytes;	/* In bytes */
	
unsigned long obytes;	/* Out bytes */
};

/*
 *      That's all usermode folks
 */



/*
 * Structure used to communicate from kernel to multicast router.
 * We'll overlay the structure onto an MLD header (not an IPv6 heder like igmpmsg{}
 * used for IPv4 implementation). This is because this structure will be passed via an
 * IPv6 raw socket, on which an application will only receiver the payload i.e the data after
 * the IPv6 header and all the extension headers. (See section 3 of RFC 3542)
 */


struct mrt6msg {

#define MRT6MSG_NOCACHE		1

#define MRT6MSG_WRONGMIF	2

#define MRT6MSG_WHOLEPKT	3		/* used for use level encap */
	
__u8		im6_mbz;		/* must be zero            */
	
__u8		im6_msgtype;		/* what type of message    */
	
__u16		im6_mif;		/* mif rec'd on            */
	
__u32		im6_pad;		/* padding for 64 bit arch */
	

struct in6_addr	im6_src, im6_dst;
};

#endif /* _UAPI__LINUX_MROUTE6_H */

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