199 lines
5.1 KiB
C
199 lines
5.1 KiB
C
/* Copyright (C) Charles Forsyth
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* See /doc/license/NOTICE.Plan9-9k.txt for details about the licensing.
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*/
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/* Portions of this file are Copyright (C) 2015-2018 Giacomo Tesio <giacomo@tesio.it>
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* See /doc/license/gpl-2.0.txt for details about the licensing.
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*/
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/* Portions of this file are Copyright (C) 9front's team.
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* See /doc/license/9front-mit for details about the licensing.
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* See http://code.9front.org/hg/plan9front/ for a list of authors.
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*/
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/*
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* Internet Protocol Version 6
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*
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* rfc2460 defines the protocol, rfc2461 neighbour discovery, and
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* rfc2462 address autoconfiguration. rfc4443 defines ICMP; was rfc2463.
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* rfc4291 defines the address architecture (including prefices), was rfc3513.
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* rfc4007 defines the scoped address architecture.
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*
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* global unicast is anything but unspecified (::), loopback (::1),
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* multicast (ff00::/8), and link-local unicast (fe80::/10).
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*
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* site-local (fec0::/10) is now deprecated, originally by rfc3879.
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*
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* Unique Local IPv6 Unicast Addresses are defined by rfc4193.
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* prefix is fc00::/7, scope is global, routing is limited to roughly a site.
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*/
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#define isv6mcast(addr) ((addr)[0] == 0xff)
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#define islinklocal(addr) ((addr)[0] == 0xfe && ((addr)[1] & 0xc0) == 0x80)
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#define optexsts(np) (nhgets((np)->ploadlen) > 24)
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#define issmcast(addr) (jehanne_memcmp((addr), v6solicitednode, 13) == 0)
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#ifndef MIN
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#define MIN(a, b) ((a) <= (b)? (a): (b))
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#endif
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enum { /* Header Types */
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HBH = 0, /* hop-by-hop multicast routing protocol */
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ICMP = 1,
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IGMP = 2,
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GGP = 3,
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IPINIP = 4,
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ST = 5,
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TCP = 6,
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UDP = 17,
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ISO_TP4 = 29,
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RH = 43,
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FH = 44,
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IDRP = 45,
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RSVP = 46,
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AH = 51,
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ESP = 52,
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ICMPv6 = 58,
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NNH = 59,
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DOH = 60,
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ISO_IP = 80,
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IGRP = 88,
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OSPF = 89,
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Maxhdrtype = 256,
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};
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enum {
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/* multicast flags and scopes */
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// Well_known_flg = 0,
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// Transient_flg = 1,
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// Interface_local_scop = 1,
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Link_local_scop = 2,
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// Site_local_scop = 5,
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// Org_local_scop = 8,
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Global_scop = 14,
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/* various prefix lengths */
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SOLN_PREF_LEN = 13,
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/* icmpv6 unreachability codes */
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Icmp6_no_route = 0,
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Icmp6_ad_prohib = 1,
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Icmp6_out_src_scope = 2,
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Icmp6_adr_unreach = 3,
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Icmp6_port_unreach = 4,
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Icmp6_gress_src_fail = 5,
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Icmp6_rej_route = 6,
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Icmp6_unknown = 7, /* our own invention for internal use */
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/* various flags & constants */
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v6MINTU = 1280,
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HOP_LIMIT = 255,
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IP6HDR = 40, /* sizeof(Ip6hdr) = 8 + 2*16 */
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/* option types */
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/* neighbour discovery */
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SRC_LLADDR = 1,
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TARGET_LLADDR = 2,
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PREFIX_INFO = 3,
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REDIR_HEADER = 4,
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MTU_OPTION = 5,
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/* new since rfc2461; see iana.org/assignments/icmpv6-parameters */
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V6nd_home = 8,
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V6nd_srcaddrs = 9, /* rfc3122 */
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V6nd_ip = 17,
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/* /lib/rfc/drafts/draft-jeong-dnsop-ipv6-dns-discovery-12.txt */
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V6nd_rdns = 25,
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/* plan 9 extensions */
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V6nd_9fs = 250,
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V6nd_9auth = 251,
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SRC_UNSPEC = 0,
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SRC_UNI = 1,
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TARG_UNI = 2,
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TARG_MULTI = 3,
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Tunitent = 1,
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Tuniproxy = 2,
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Tunirany = 3,
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/* Node constants */
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MAX_MULTICAST_SOLICIT = 3,
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RETRANS_TIMER = 1000,
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};
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typedef struct Ip6hdr Ip6hdr;
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typedef struct Opthdr Opthdr;
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typedef struct Routinghdr Routinghdr;
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typedef struct Fraghdr6 Fraghdr6;
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/* we do this in case there's padding at the end of Ip6hdr */
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#define IPV6HDR \
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uint8_t vcf[4]; /* version:4, traffic class:8, flow label:20 */\
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uint8_t ploadlen[2]; /* payload length: packet length - 40 */ \
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uint8_t proto; /* next header type */ \
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uint8_t ttl; /* hop limit */ \
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uint8_t src[IPaddrlen]; \
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uint8_t dst[IPaddrlen]
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struct Ip6hdr {
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IPV6HDR;
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uint8_t payload[];
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};
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struct Opthdr { /* unused */
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uint8_t nexthdr;
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uint8_t len;
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};
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/*
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* Beware routing header type 0 (loose source routing); see
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* http://www.secdev.org/conf/IPv6_RH_security-csw07.pdf.
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* Type 1 is unused. Type 2 is for MIPv6 (mobile IPv6) filtering
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* against type 0 header.
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*/
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struct Routinghdr { /* unused */
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uint8_t nexthdr;
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uint8_t len;
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uint8_t rtetype;
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uint8_t segrem;
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};
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struct Fraghdr6 {
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uint8_t nexthdr;
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uint8_t res;
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uint8_t offsetRM[2]; /* Offset, Res, M flag */
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uint8_t id[4];
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};
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extern uint8_t v6allnodesN[IPaddrlen];
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extern uint8_t v6allnodesL[IPaddrlen];
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extern uint8_t v6allroutersN[IPaddrlen];
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extern uint8_t v6allroutersL[IPaddrlen];
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extern uint8_t v6allnodesNmask[IPaddrlen];
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extern uint8_t v6allnodesLmask[IPaddrlen];
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extern uint8_t v6solicitednode[IPaddrlen];
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extern uint8_t v6solicitednodemask[IPaddrlen];
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extern uint8_t v6Unspecified[IPaddrlen];
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extern uint8_t v6loopback[IPaddrlen];
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extern uint8_t v6loopbackmask[IPaddrlen];
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extern uint8_t v6linklocal[IPaddrlen];
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extern uint8_t v6linklocalmask[IPaddrlen];
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extern uint8_t v6multicast[IPaddrlen];
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extern uint8_t v6multicastmask[IPaddrlen];
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extern int v6llpreflen;
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extern int v6mcpreflen;
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extern int v6snpreflen;
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extern int v6aNpreflen;
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extern int v6aLpreflen;
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extern int ReTransTimer;
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void ipv62smcast(uint8_t *, uint8_t *);
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void icmpns(Fs *f, uint8_t* src, int suni, uint8_t* targ, int tuni, uint8_t* mac);
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void icmpna(Fs *f, uint8_t* src, uint8_t* dst, uint8_t* targ, uint8_t* mac, uint8_t flags);
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void icmpttlexceeded6(Fs *f, Ipifc *ifc, Block *bp);
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void icmppkttoobig6(Fs *f, Ipifc *ifc, Block *bp);
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void icmphostunr(Fs *f, Ipifc *ifc, Block *bp, int code, int free);
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