/* * Internet Protocol Version 6 * * rfc2460 defines the protocol, rfc2461 neighbour discovery, and * rfc2462 address autoconfiguration.  rfc4443 defines ICMP; was rfc2463. * rfc4291 defines the address architecture (including prefices), was rfc3513. * rfc4007 defines the scoped address architecture. * * global unicast is anything but unspecified (::), loopback (::1), * multicast (ff00::/8), and link-local unicast (fe80::/10). * * site-local (fec0::/10) is now deprecated, originally by rfc3879. * * Unique Local IPv6 Unicast Addresses are defined by rfc4193. * prefix is fc00::/7, scope is global, routing is limited to roughly a site. */#define isv6mcast(addr)	  ((addr)[0] == 0xff)#define islinklocal(addr) ((addr)[0] == 0xfe && ((addr)[1] & 0xc0) == 0x80) #define optexsts(np)	(nhgets((np)->ploadlen) > 24)#define issmcast(addr)	(memcmp((addr), v6solicitednode, 13) == 0) #ifndef MIN#define MIN(a, b) ((a) <= (b)? (a): (b))#endif enum {				/* Header Types */	HBH		= 0,	/* hop-by-hop multicast routing protocol */	ICMP		= 1,	IGMP		= 2,	GGP		= 3,	IPINIP		= 4,	ST		= 5,	TCP		= 6,	UDP		= 17,	ISO_TP4		= 29,	RH		= 43,	FH		= 44,	IDRP		= 45,	RSVP		= 46,	AH		= 51,	ESP		= 52,	ICMPv6		= 58,	NNH		= 59,	DOH		= 60,	ISO_IP		= 80,	IGRP		= 88,	OSPF		= 89, 	Maxhdrtype	= 256,}; enum {	/* multicast flags and scopes */ //	Well_known_flg	= 0,//	Transient_flg	= 1, //	Interface_local_scop = 1,	Link_local_scop	= 2,//	Site_local_scop	= 5,//	Org_local_scop	= 8,	Global_scop	= 14, 	/* various prefix lengths */	SOLN_PREF_LEN	= 13, 	/* icmpv6 unreachability codes */	Icmp6_no_route		= 0,	Icmp6_ad_prohib		= 1,	Icmp6_out_src_scope	= 2,	Icmp6_adr_unreach	= 3,	Icmp6_port_unreach	= 4,	Icmp6_gress_src_fail	= 5,	Icmp6_rej_route		= 6,	Icmp6_unknown		= 7,  /* our own invention for internal use */ 	/* various flags & constants */	v6MINTU		= 1280,	HOP_LIMIT	= 255,	IP6HDR		= 40,		/* sizeof(Ip6hdr) = 8 + 2*16 */ 	/* option types */ 	/* neighbour discovery */	SRC_LLADDR	= 1,	TARGET_LLADDR	= 2,	PREFIX_INFO	= 3,	REDIR_HEADER	= 4,	MTU_OPTION	= 5,	/* new since rfc2461; see iana.org/assignments/icmpv6-parameters */	V6nd_home	= 8,	V6nd_srcaddrs	= 9,		/* rfc3122 */	V6nd_ip		= 17,	/* /lib/rfc/drafts/draft-jeong-dnsop-ipv6-dns-discovery-12.txt */	V6nd_rdns	= 25,	/* plan 9 extensions */	V6nd_9fs	= 250,	V6nd_9auth	= 251, 	SRC_UNSPEC	= 0,	SRC_UNI		= 1,	TARG_UNI	= 2,	TARG_MULTI	= 3, 	Tunitent	= 1,	Tuniproxy	= 2,	Tunirany	= 3, 	/* Node constants */	MAX_MULTICAST_SOLICIT	= 3,	RETRANS_TIMER		= 1000,}; typedef struct Ip6hdr	Ip6hdr;typedef struct Opthdr	Opthdr;typedef struct Routinghdr Routinghdr;typedef struct Fraghdr6	Fraghdr6; /* we do this in case there's padding at the end of Ip6hdr */#define IPV6HDR \	uchar	vcf[4];		/* version:4, traffic class:8, flow label:20 */\	uchar	ploadlen[2];	/* payload length: packet length - 40 */ \	uchar	proto;		/* next header type */ \	uchar	ttl;		/* hop limit */ \	uchar	src[IPaddrlen]; \	uchar	dst[IPaddrlen] struct	Ip6hdr {	IPV6HDR;	uchar	payload[];}; struct	Opthdr {		/* unused */	uchar	nexthdr;	uchar	len;}; /* * Beware routing header type 0 (loose source routing); see * http://www.secdev.org/conf/IPv6_RH_security-csw07.pdf. * Type 1 is unused.  Type 2 is for MIPv6 (mobile IPv6) filtering * against type 0 header. */struct	Routinghdr {		/* unused */	uchar	nexthdr;	uchar	len;	uchar	rtetype;	uchar	segrem;}; struct	Fraghdr6 {	uchar	nexthdr;	uchar	res;	uchar	offsetRM[2];	/* Offset, Res, M flag */	uchar	id[4];}; extern uchar v6allnodesN[IPaddrlen];extern uchar v6allnodesL[IPaddrlen];extern uchar v6allroutersN[IPaddrlen];extern uchar v6allroutersL[IPaddrlen];extern uchar v6allnodesNmask[IPaddrlen];extern uchar v6allnodesLmask[IPaddrlen];extern uchar v6solicitednode[IPaddrlen];extern uchar v6solicitednodemask[IPaddrlen];extern uchar v6Unspecified[IPaddrlen];extern uchar v6loopback[IPaddrlen];extern uchar v6loopbackmask[IPaddrlen];extern uchar v6linklocal[IPaddrlen];extern uchar v6linklocalmask[IPaddrlen];extern uchar v6multicast[IPaddrlen];extern uchar v6multicastmask[IPaddrlen]; extern int v6llpreflen;extern int v6mcpreflen;extern int v6snpreflen;extern int v6aNpreflen;extern int v6aLpreflen; extern int ReTransTimer; void ipv62smcast(uchar *, uchar *);void icmpns(Fs *f, uchar* src, int suni, uchar* targ, int tuni, uchar* mac);void icmpna(Fs *f, uchar* src, uchar* dst, uchar* targ, uchar* mac, uchar flags);void icmpttlexceeded6(Fs *f, Ipifc *ifc, Block *bp);void icmppkttoobig6(Fs *f, Ipifc *ifc, Block *bp);void icmphostunr(Fs *f, Ipifc *ifc, Block *bp, int code, int free);