cregit-Linux how code gets into the kernel

Release 4.7 include/uapi/linux/ipv6.h

#ifndef _UAPI_IPV6_H

#define _UAPI_IPV6_H

#include <linux/libc-compat.h>
#include <linux/types.h>
#include <linux/in6.h>
#include <asm/byteorder.h>

/* The latest drafts declared increase in minimal mtu up to 1280. */


#define IPV6_MIN_MTU	1280

/*
 *      Advanced API
 *      source interface/address selection, source routing, etc...
 *      *under construction*
 */

#if __UAPI_DEF_IN6_PKTINFO

struct in6_pktinfo {
	
struct in6_addr	ipi6_addr;
	
int		ipi6_ifindex;
};
#endif

#if __UAPI_DEF_IP6_MTUINFO

struct ip6_mtuinfo {
	
struct sockaddr_in6	ip6m_addr;
	
__u32			ip6m_mtu;
};
#endif


struct in6_ifreq {
	
struct in6_addr	ifr6_addr;
	
__u32		ifr6_prefixlen;
	
int		ifr6_ifindex; 
};


#define IPV6_SRCRT_STRICT	0x01	
/* Deprecated; will be removed */

#define IPV6_SRCRT_TYPE_0	0	
/* Deprecated; will be removed */

#define IPV6_SRCRT_TYPE_2	2	
/* IPv6 type 2 Routing Header   */

/*
 *      routing header
 */

struct ipv6_rt_hdr {
	
__u8		nexthdr;
	
__u8		hdrlen;
	
__u8		type;
	
__u8		segments_left;

	/*
         *      type specific data
         *      variable length field
         */
};



struct ipv6_opt_hdr {
	
__u8 		nexthdr;
	
__u8 		hdrlen;
	/* 
         * TLV encoded option data follows.
         */
} __attribute__((packed));	/* required for some archs */


#define ipv6_destopt_hdr ipv6_opt_hdr

#define ipv6_hopopt_hdr  ipv6_opt_hdr

/* Router Alert option values (RFC2711) */

#define IPV6_OPT_ROUTERALERT_MLD	0x0000	
/* MLD(RFC2710) */

/*
 *      routing header type 0 (used in cmsghdr struct)
 */


struct rt0_hdr {
	
struct ipv6_rt_hdr	rt_hdr;
	
__u32			reserved;
	
struct in6_addr		addr[0];


#define rt0_type		rt_hdr.type
};

/*
 *      routing header type 2
 */


struct rt2_hdr {
	
struct ipv6_rt_hdr	rt_hdr;
	
__u32			reserved;
	
struct in6_addr		addr;


#define rt2_type		rt_hdr.type
};

/*
 *      home address option in destination options header
 */


struct ipv6_destopt_hao {
	
__u8			type;
	
__u8			length;
	
struct in6_addr		addr;
} __attribute__((packed));

/*
 *      IPv6 fixed header
 *
 *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 *      are glued to priority now, forming "class".
 */


struct ipv6hdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	
__u8			priority:4,
				
version:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u8			version:4,
				priority:4;
#else
#error	"Please fix <asm/byteorder.h>"
#endif
	
__u8			flow_lbl[3];

	
__be16			payload_len;
	
__u8			nexthdr;
	
__u8			hop_limit;

	
struct	in6_addr	saddr;
	
struct	in6_addr	daddr;
};


/* index values for the variables in ipv6_devconf */
enum {
	
DEVCONF_FORWARDING = 0,
	
DEVCONF_HOPLIMIT,
	
DEVCONF_MTU6,
	
DEVCONF_ACCEPT_RA,
	
DEVCONF_ACCEPT_REDIRECTS,
	
DEVCONF_AUTOCONF,
	
DEVCONF_DAD_TRANSMITS,
	
DEVCONF_RTR_SOLICITS,
	
DEVCONF_RTR_SOLICIT_INTERVAL,
	
DEVCONF_RTR_SOLICIT_DELAY,
	
DEVCONF_USE_TEMPADDR,
	
DEVCONF_TEMP_VALID_LFT,
	
DEVCONF_TEMP_PREFERED_LFT,
	
DEVCONF_REGEN_MAX_RETRY,
	
DEVCONF_MAX_DESYNC_FACTOR,
	
DEVCONF_MAX_ADDRESSES,
	
DEVCONF_FORCE_MLD_VERSION,
	
DEVCONF_ACCEPT_RA_DEFRTR,
	
DEVCONF_ACCEPT_RA_PINFO,
	
DEVCONF_ACCEPT_RA_RTR_PREF,
	
DEVCONF_RTR_PROBE_INTERVAL,
	
DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
	
DEVCONF_PROXY_NDP,
	
DEVCONF_OPTIMISTIC_DAD,
	
DEVCONF_ACCEPT_SOURCE_ROUTE,
	
DEVCONF_MC_FORWARDING,
	
DEVCONF_DISABLE_IPV6,
	
DEVCONF_ACCEPT_DAD,
	
DEVCONF_FORCE_TLLAO,
	
DEVCONF_NDISC_NOTIFY,
	
DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL,
	
DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL,
	
DEVCONF_SUPPRESS_FRAG_NDISC,
	
DEVCONF_ACCEPT_RA_FROM_LOCAL,
	
DEVCONF_USE_OPTIMISTIC,
	
DEVCONF_ACCEPT_RA_MTU,
	
DEVCONF_STABLE_SECRET,
	
DEVCONF_USE_OIF_ADDRS_ONLY,
	
DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
	
DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
	
DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
	
DEVCONF_DROP_UNSOLICITED_NA,
	
DEVCONF_KEEP_ADDR_ON_DOWN,
	
DEVCONF_MAX
};


#endif /* _UAPI_IPV6_H */

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