text: /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
  /*
   * INET		An implementation of the TCP/IP protocol suite for the LINUX
   *		operating system.  INET is implemented using the  BSD Socket
   *		interface as the means of communication with the user level.
   *
   *		Definitions of the Internet Protocol.
   *
   * Version:	@(#)in.h	1.0.1	04/21/93
   *
   * Authors:	Original taken from the GNU Project <netinet/in.h> file.
   *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
   *
   *		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 of the License, or (at your option) any later version.
   */
  #ifndef _UAPI_LINUX_IN_H
  #define _UAPI_LINUX_IN_H
  
  #include <linux/types.h>
  #include <linux/libc-compat.h>
  #include <linux/socket.h>
  
  #if __UAPI_DEF_IN_IPPROTO
  /* Standard well-defined IP protocols.  */
  enum {
    IPPROTO_IP = 0,		/* Dummy protocol for TCP		*/
  #define IPPROTO_IP		IPPROTO_IP
    IPPROTO_ICMP = 1,		/* Internet Control Message Protocol	*/
  #define IPPROTO_ICMP		IPPROTO_ICMP
    IPPROTO_IGMP = 2,		/* Internet Group Management Protocol	*/
  #define IPPROTO_IGMP		IPPROTO_IGMP
    IPPROTO_IPIP = 4,		/* IPIP tunnels (older KA9Q tunnels use 94) */
  #define IPPROTO_IPIP		IPPROTO_IPIP
    IPPROTO_TCP = 6,		/* Transmission Control Protocol	*/
  #define IPPROTO_TCP		IPPROTO_TCP
    IPPROTO_EGP = 8,		/* Exterior Gateway Protocol		*/
  #define IPPROTO_EGP		IPPROTO_EGP
    IPPROTO_PUP = 12,		/* PUP protocol				*/
  #define IPPROTO_PUP		IPPROTO_PUP
    IPPROTO_UDP = 17,		/* User Datagram Protocol		*/
  #define IPPROTO_UDP		IPPROTO_UDP
    IPPROTO_IDP = 22,		/* XNS IDP protocol			*/
  #define IPPROTO_IDP		IPPROTO_IDP
    IPPROTO_TP = 29,		/* SO Transport Protocol Class 4	*/
  #define IPPROTO_TP		IPPROTO_TP
    IPPROTO_DCCP = 33,		/* Datagram Congestion Control Protocol */
  #define IPPROTO_DCCP		IPPROTO_DCCP
    IPPROTO_IPV6 = 41,		/* IPv6-in-IPv4 tunnelling		*/
  #define IPPROTO_IPV6		IPPROTO_IPV6
    IPPROTO_RSVP = 46,		/* RSVP Protocol			*/
  #define IPPROTO_RSVP		IPPROTO_RSVP
    IPPROTO_GRE = 47,		/* Cisco GRE tunnels (rfc 1701,1702)	*/
  #define IPPROTO_GRE		IPPROTO_GRE
    IPPROTO_ESP = 50,		/* Encapsulation Security Payload protocol */
  #define IPPROTO_ESP		IPPROTO_ESP
    IPPROTO_AH = 51,		/* Authentication Header protocol	*/
  #define IPPROTO_AH		IPPROTO_AH
    IPPROTO_MTP = 92,		/* Multicast Transport Protocol		*/
  #define IPPROTO_MTP		IPPROTO_MTP
    IPPROTO_BEETPH = 94,		/* IP option pseudo header for BEET	*/
  #define IPPROTO_BEETPH		IPPROTO_BEETPH
    IPPROTO_ENCAP = 98,		/* Encapsulation Header			*/
  #define IPPROTO_ENCAP		IPPROTO_ENCAP
    IPPROTO_PIM = 103,		/* Protocol Independent Multicast	*/
  #define IPPROTO_PIM		IPPROTO_PIM
    IPPROTO_COMP = 108,		/* Compression Header Protocol		*/
  #define IPPROTO_COMP		IPPROTO_COMP
    IPPROTO_SCTP = 132,		/* Stream Control Transport Protocol	*/
  #define IPPROTO_SCTP		IPPROTO_SCTP
    IPPROTO_UDPLITE = 136,	/* UDP-Lite (RFC 3828)			*/
  #define IPPROTO_UDPLITE		IPPROTO_UDPLITE
    IPPROTO_MPLS = 137,		/* MPLS in IP (RFC 4023)		*/
  #define IPPROTO_MPLS		IPPROTO_MPLS
    IPPROTO_ETHERNET = 143,	/* Ethernet-within-IPv6 Encapsulation	*/
  #define IPPROTO_ETHERNET	IPPROTO_ETHERNET
    IPPROTO_RAW = 255,		/* Raw IP packets			*/
  #define IPPROTO_RAW		IPPROTO_RAW
    IPPROTO_MPTCP = 262,		/* Multipath TCP connection		*/
  #define IPPROTO_MPTCP		IPPROTO_MPTCP
    IPPROTO_MAX
  };
  #endif
  
  #if __UAPI_DEF_IN_ADDR
  /* Internet address. */
  struct in_addr {
  	__be32	s_addr;
  };
  #endif
  
  #define IP_TOS		1
  #define IP_TTL		2
  #define IP_HDRINCL	3
  #define IP_OPTIONS	4
  #define IP_ROUTER_ALERT	5
  #define IP_RECVOPTS	6
  #define IP_RETOPTS	7
  #define IP_PKTINFO	8
  #define IP_PKTOPTIONS	9
  #define IP_MTU_DISCOVER	10
  #define IP_RECVERR	11
  #define IP_RECVTTL	12
  #define	IP_RECVTOS	13
  #define IP_MTU		14
  #define IP_FREEBIND	15
  #define IP_IPSEC_POLICY	16
  #define IP_XFRM_POLICY	17
  #define IP_PASSSEC	18
  #define IP_TRANSPARENT	19
  
  /* BSD compatibility */
  #define IP_RECVRETOPTS	IP_RETOPTS
  
  /* TProxy original addresses */
  #define IP_ORIGDSTADDR       20
  #define IP_RECVORIGDSTADDR   IP_ORIGDSTADDR
  
  #define IP_MINTTL       21
  #define IP_NODEFRAG     22
  #define IP_CHECKSUM	23
  #define IP_BIND_ADDRESS_NO_PORT	24
  #define IP_RECVFRAGSIZE	25
  #define IP_RECVERR_RFC4884	26
  
  /* IP_MTU_DISCOVER values */
  #define IP_PMTUDISC_DONT		0	/* Never send DF frames */
  #define IP_PMTUDISC_WANT		1	/* Use per route hints	*/
  #define IP_PMTUDISC_DO			2	/* Always DF		*/
  #define IP_PMTUDISC_PROBE		3       /* Ignore dst pmtu      */
  /* Always use interface mtu (ignores dst pmtu) but don't set DF flag.
   * Also incoming ICMP frag_needed notifications will be ignored on
   * this socket to prevent accepting spoofed ones.
   */
  #define IP_PMTUDISC_INTERFACE		4
  /* weaker version of IP_PMTUDISC_INTERFACE, which allows packets to get
   * fragmented if they exeed the interface mtu
   */
  #define IP_PMTUDISC_OMIT		5
  
  #define IP_MULTICAST_IF			32
  #define IP_MULTICAST_TTL 		33
  #define IP_MULTICAST_LOOP 		34
  #define IP_ADD_MEMBERSHIP		35
  #define IP_DROP_MEMBERSHIP		36
  #define IP_UNBLOCK_SOURCE		37
  #define IP_BLOCK_SOURCE			38
  #define IP_ADD_SOURCE_MEMBERSHIP	39
  #define IP_DROP_SOURCE_MEMBERSHIP	40
  #define IP_MSFILTER			41
  #define MCAST_JOIN_GROUP		42
  #define MCAST_BLOCK_SOURCE		43
  #define MCAST_UNBLOCK_SOURCE		44
  #define MCAST_LEAVE_GROUP		45
  #define MCAST_JOIN_SOURCE_GROUP		46
  #define MCAST_LEAVE_SOURCE_GROUP	47
  #define MCAST_MSFILTER			48
  #define IP_MULTICAST_ALL		49
  #define IP_UNICAST_IF			50
  
  #define MCAST_EXCLUDE	0
  #define MCAST_INCLUDE	1
  
  /* These need to appear somewhere around here */
  #define IP_DEFAULT_MULTICAST_TTL        1
  #define IP_DEFAULT_MULTICAST_LOOP       1
  
  /* Request struct for multicast socket ops */
  
  #if __UAPI_DEF_IP_MREQ
  struct ip_mreq  {
  	struct in_addr imr_multiaddr;	/* IP multicast address of group */
  	struct in_addr imr_interface;	/* local IP address of interface */
  };
  
  struct ip_mreqn {
  	struct in_addr	imr_multiaddr;		/* IP multicast address of group */
  	struct in_addr	imr_address;		/* local IP address of interface */
  	int		imr_ifindex;		/* Interface index */
  };
  
  struct ip_mreq_source {
  	__be32		imr_multiaddr;
  	__be32		imr_interface;
  	__be32		imr_sourceaddr;
  };
  
  struct ip_msfilter {
  	__be32		imsf_multiaddr;
  	__be32		imsf_interface;
  	__u32		imsf_fmode;
  	__u32		imsf_numsrc;
  	__be32		imsf_slist[1];
  };
  
  #define IP_MSFILTER_SIZE(numsrc) \
  	(sizeof(struct ip_msfilter) - sizeof(__u32) \
  	+ (numsrc) * sizeof(__u32))
  
  struct group_req {
  	__u32				 gr_interface;	/* interface index */
  	struct __kernel_sockaddr_storage gr_group;	/* group address */
  };
  
  struct group_source_req {
  	__u32				 gsr_interface;	/* interface index */
  	struct __kernel_sockaddr_storage gsr_group;	/* group address */
  	struct __kernel_sockaddr_storage gsr_source;	/* source address */
  };
  
  struct group_filter {
  	__u32				 gf_interface;	/* interface index */
  	struct __kernel_sockaddr_storage gf_group;	/* multicast address */
  	__u32				 gf_fmode;	/* filter mode */
  	__u32				 gf_numsrc;	/* number of sources */
  	struct __kernel_sockaddr_storage gf_slist[1];	/* interface index */
  };
  
  #define GROUP_FILTER_SIZE(numsrc) \
  	(sizeof(struct group_filter) - sizeof(struct __kernel_sockaddr_storage) \
  	+ (numsrc) * sizeof(struct __kernel_sockaddr_storage))
  #endif
  
  #if __UAPI_DEF_IN_PKTINFO
  struct in_pktinfo {
  	int		ipi_ifindex;
  	struct in_addr	ipi_spec_dst;
  	struct in_addr	ipi_addr;
  };
  #endif
  
  /* Structure describing an Internet (IP) socket address. */
  #if  __UAPI_DEF_SOCKADDR_IN
  #define __SOCK_SIZE__	16		/* sizeof(struct sockaddr)	*/
  struct sockaddr_in {
    __kernel_sa_family_t	sin_family;	/* Address family		*/
    __be16		sin_port;	/* Port number			*/
    struct in_addr	sin_addr;	/* Internet address		*/
  
    /* Pad to size of `struct sockaddr'. */
    unsigned char		__pad[__SOCK_SIZE__ - sizeof(short int) -
  			sizeof(unsigned short int) - sizeof(struct in_addr)];
  };
  #define sin_zero	__pad		/* for BSD UNIX comp. -FvK	*/
  #endif
  
  #if __UAPI_DEF_IN_CLASS
  /*
   * Definitions of the bits in an Internet address integer.
   * On subnets, host and network parts are found according
   * to the subnet mask, not these masks.
   */
  #define	IN_CLASSA(a)		((((long int) (a)) & 0x80000000) == 0)
  #define	IN_CLASSA_NET		0xff000000
  #define	IN_CLASSA_NSHIFT	24
  #define	IN_CLASSA_HOST		(0xffffffff & ~IN_CLASSA_NET)
  #define	IN_CLASSA_MAX		128
  
  #define	IN_CLASSB(a)		((((long int) (a)) & 0xc0000000) == 0x80000000)
  #define	IN_CLASSB_NET		0xffff0000
  #define	IN_CLASSB_NSHIFT	16
  #define	IN_CLASSB_HOST		(0xffffffff & ~IN_CLASSB_NET)
  #define	IN_CLASSB_MAX		65536
  
  #define	IN_CLASSC(a)		((((long int) (a)) & 0xe0000000) == 0xc0000000)
  #define	IN_CLASSC_NET		0xffffff00
  #define	IN_CLASSC_NSHIFT	8
  #define	IN_CLASSC_HOST		(0xffffffff & ~IN_CLASSC_NET)
  
  #define	IN_CLASSD(a)		((((long int) (a)) & 0xf0000000) == 0xe0000000)
  #define	IN_MULTICAST(a)		IN_CLASSD(a)
  #define	IN_MULTICAST_NET	0xe0000000
  
  #define	IN_BADCLASS(a)		(((long int) (a) ) == (long int)0xffffffff)
  #define	IN_EXPERIMENTAL(a)	IN_BADCLASS((a))
  
  #define	IN_CLASSE(a)		((((long int) (a)) & 0xf0000000) == 0xf0000000)
  #define	IN_CLASSE_NET		0xffffffff
  #define	IN_CLASSE_NSHIFT	0
  
  /* Address to accept any incoming messages. */
  #define	INADDR_ANY		((unsigned long int) 0x00000000)
  
  /* Address to send to all hosts. */
  #define	INADDR_BROADCAST	((unsigned long int) 0xffffffff)
  
  /* Address indicating an error return. */
  #define	INADDR_NONE		((unsigned long int) 0xffffffff)
  
  /* Dummy address for src of ICMP replies if no real address is set (RFC7600). */
  #define	INADDR_DUMMY		((unsigned long int) 0xc0000008)
  
  /* Network number for local host loopback. */
  #define	IN_LOOPBACKNET		127
  
  /* Address to loopback in software to local host.  */
  #define	INADDR_LOOPBACK		0x7f000001	/* 127.0.0.1   */
  #define	IN_LOOPBACK(a)		((((long int) (a)) & 0xff000000) == 0x7f000000)
  
  /* Defines for Multicast INADDR */
  #define INADDR_UNSPEC_GROUP		0xe0000000U	/* 224.0.0.0   */
  #define INADDR_ALLHOSTS_GROUP		0xe0000001U	/* 224.0.0.1   */
  #define INADDR_ALLRTRS_GROUP		0xe0000002U	/* 224.0.0.2 */
  #define INADDR_ALLSNOOPERS_GROUP	0xe000006aU	/* 224.0.0.106 */
  #define INADDR_MAX_LOCAL_GROUP		0xe00000ffU	/* 224.0.0.255 */
  #endif
  
  /* <asm/byteorder.h> contains the htonl type stuff.. */
  #include <asm/byteorder.h> 
  
  
  #endif /* _UAPI_LINUX_IN_H */
  