ref: 27ca2618d4bc7642370feb39a83a3cff92495ca2
dir: /os/ip/ipv6.h/
#define MIN(a, b) ((a) <= (b) ? (a) : (b))
/* rfc 3513 defines the address prefices */
#define isv6mcast(addr) ((addr)[0] == 0xff)
#define islinklocal(addr) ((addr)[0] == 0xfe && ((addr)[1] & 0xc0) == 0x80)
#define issitelocal(addr) ((addr)[0] == 0xfe && ((addr)[1] & 0xc0) == 0xc0)
#define isv6global(addr) (((addr)[0] & 0xe0) == 0x20)
#define optexsts(np) (nhgets((np)->ploadlen) > 24)
#define issmcast(addr) (memcmp((addr), v6solicitednode, 13) == 0)
/* from RFC 2460 */
typedef struct Ip6hdr Ip6hdr;
typedef struct Opthdr Opthdr;
typedef struct Routinghdr Routinghdr;
typedef struct Fraghdr6 Fraghdr6;
struct Ip6hdr {
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 Opthdr {
uchar nexthdr;
uchar len;
};
struct Routinghdr {
uchar nexthdr;
uchar len;
uchar rtetype;
uchar segrem;
};
struct Fraghdr6 {
uchar nexthdr;
uchar res;
uchar offsetRM[2]; // Offset, Res, M flag
uchar id[4];
};
enum { /* Header Types */
HBH = 0, //?
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 flgs and scop
well_known_flg = 0,
transient_flg = 1,
node_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 unreach codes
icmp6_no_route = 0,
icmp6_ad_prohib = 1,
icmp6_unassigned = 2,
icmp6_adr_unreach = 3,
icmp6_port_unreach = 4,
icmp6_unkn_code = 5,
// various flags & constants
v6MINTU = 1280,
HOP_LIMIT = 255,
ETHERHDR_LEN = 14,
IPV6HDR_LEN = 40,
IPV4HDR_LEN = 20,
// option types
SRC_LLADDRESS = 1,
TARGET_LLADDRESS = 2,
PREFIX_INFO = 3,
REDIR_HEADER = 4,
MTU_OPTION = 5,
SRC_UNSPEC = 0,
SRC_UNI = 1,
TARG_UNI = 2,
TARG_MULTI = 3,
t_unitent = 1,
t_uniproxy = 2,
t_unirany = 3,
// Router constants (all times in milliseconds)
MAX_INITIAL_RTR_ADVERT_INTERVAL = 16000,
MAX_INITIAL_RTR_ADVERTISEMENTS = 3,
MAX_FINAL_RTR_ADVERTISEMENTS = 3,
MIN_DELAY_BETWEEN_RAS = 3000,
MAX_RA_DELAY_TIME = 500,
// Host constants
MAX_RTR_SOLICITATION_DELAY = 1000,
RTR_SOLICITATION_INTERVAL = 4000,
MAX_RTR_SOLICITATIONS = 3,
// Node constants
MAX_MULTICAST_SOLICIT = 3,
MAX_UNICAST_SOLICIT = 3,
MAX_ANYCAST_DELAY_TIME = 1000,
MAX_NEIGHBOR_ADVERTISEMENT = 3,
REACHABLE_TIME = 30000,
RETRANS_TIMER = 1000,
DELAY_FIRST_PROBE_TIME = 5000,
};
extern void ipv62smcast(uchar *, uchar *);
extern void icmpns(Fs *f, uchar* src, int suni, uchar* targ, int tuni, uchar* mac);
extern void icmpna(Fs *f, uchar* src, uchar* dst, uchar* targ, uchar* mac, uchar flags);
extern void icmpttlexceeded6(Fs *f, Ipifc *ifc, Block *bp);
extern void icmppkttoobig6(Fs *f, Ipifc *ifc, Block *bp);
extern void icmphostunr(Fs *f, Ipifc *ifc, Block *bp, int code, int free);
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 v6allroutersS[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 v6sitelocal[IPaddrlen];
extern uchar v6sitelocalmask[IPaddrlen];
extern uchar v6glunicast[IPaddrlen];
extern uchar v6multicast[IPaddrlen];
extern uchar v6multicastmask[IPaddrlen];
extern int v6llpreflen;
extern int v6slpreflen;
extern int v6lbpreflen;
extern int v6mcpreflen;
extern int v6snpreflen;
extern int v6aNpreflen;
extern int v6aLpreflen;
extern int ReTransTimer;