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/*
* 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);
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