/* * ip.h * * Internet Protocol (RFC 791). * * Copyright (c) 2000 Dug Song * * $Id: ip.h,v 1.23 2003/03/16 17:39:17 dugsong Exp $ */ #ifndef DNET_IP_H #define DNET_IP_H #define IP_ADDR_LEN 4 /* IP address length */ #define IP_ADDR_BITS 32 /* IP address bits */ #define IP_HDR_LEN 20 /* base IP header length */ #define IP_OPT_LEN 2 /* base IP option length */ #define IP_OPT_LEN_MAX 40 #define IP_HDR_LEN_MAX (IP_HDR_LEN + IP_OPT_LEN_MAX) #define IP_LEN_MAX 65535 #define IP_LEN_MIN IP_HDR_LEN typedef uint32_t ip_addr_t; #ifndef __GNUC__ # define __attribute__(x) # pragma pack(1) #endif /* * IP header, without options */ struct ip_hdr { #if DNET_BYTESEX == DNET_BIG_ENDIAN uint8_t ip_v:4, /* version */ ip_hl:4; /* header length (incl any options) */ #elif DNET_BYTESEX == DNET_LIL_ENDIAN uint8_t ip_hl:4, ip_v:4; #else # error "need to include " #endif uint8_t ip_tos; /* type of service */ uint16_t ip_len; /* total length (incl header) */ uint16_t ip_id; /* identification */ uint16_t ip_off; /* fragment offset and flags */ uint8_t ip_ttl; /* time to live */ uint8_t ip_p; /* protocol */ uint16_t ip_sum; /* checksum */ ip_addr_t ip_src; /* source address */ ip_addr_t ip_dst; /* destination address */ }; /* * Type of service (ip_tos), RFC 1349 ("obsoleted by RFC 2474") */ #define IP_TOS_DEFAULT 0x00 /* default */ #define IP_TOS_LOWDELAY 0x10 /* low delay */ #define IP_TOS_THROUGHPUT 0x08 /* high throughput */ #define IP_TOS_RELIABILITY 0x04 /* high reliability */ #define IP_TOS_LOWCOST 0x02 /* low monetary cost - XXX */ #define IP_TOS_ECT 0x02 /* ECN-capable transport */ #define IP_TOS_CE 0x01 /* congestion experienced */ /* * IP precedence (high 3 bits of ip_tos), hopefully unused */ #define IP_TOS_PREC_ROUTINE 0x00 #define IP_TOS_PREC_PRIORITY 0x20 #define IP_TOS_PREC_IMMEDIATE 0x40 #define IP_TOS_PREC_FLASH 0x60 #define IP_TOS_PREC_FLASHOVERRIDE 0x80 #define IP_TOS_PREC_CRITIC_ECP 0xa0 #define IP_TOS_PREC_INTERNETCONTROL 0xc0 #define IP_TOS_PREC_NETCONTROL 0xe0 /* * Fragmentation flags (ip_off) */ #define IP_RF 0x8000 /* reserved */ #define IP_DF 0x4000 /* don't fragment */ #define IP_MF 0x2000 /* more fragments (not last frag) */ #define IP_OFFMASK 0x1fff /* mask for fragment offset */ /* * Time-to-live (ip_ttl), seconds */ #define IP_TTL_DEFAULT 64 /* default ttl, RFC 1122, RFC 1340 */ #define IP_TTL_MAX 255 /* maximum ttl */ /* * Protocol (ip_p) - http://www.iana.org/assignments/protocol-numbers */ #define IP_PROTO_IP 0 /* dummy for IP */ #define IP_PROTO_HOPOPTS IP_PROTO_IP /* IPv6 hop-by-hop options */ #define IP_PROTO_ICMP 1 /* ICMP */ #define IP_PROTO_IGMP 2 /* IGMP */ #define IP_PROTO_GGP 3 /* gateway-gateway protocol */ #define IP_PROTO_IPIP 4 /* IP in IP */ #define IP_PROTO_ST 5 /* ST datagram mode */ #define IP_PROTO_TCP 6 /* TCP */ #define IP_PROTO_CBT 7 /* CBT */ #define IP_PROTO_EGP 8 /* exterior gateway protocol */ #define IP_PROTO_IGP 9 /* interior gateway protocol */ #define IP_PROTO_BBNRCC 10 /* BBN RCC monitoring */ #define IP_PROTO_NVP 11 /* Network Voice Protocol */ #define IP_PROTO_PUP 12 /* PARC universal packet */ #define IP_PROTO_ARGUS 13 /* ARGUS */ #define IP_PROTO_EMCON 14 /* EMCON */ #define IP_PROTO_XNET 15 /* Cross Net Debugger */ #define IP_PROTO_CHAOS 16 /* Chaos */ #define IP_PROTO_UDP 17 /* UDP */ #define IP_PROTO_MUX 18 /* multiplexing */ #define IP_PROTO_DCNMEAS 19 /* DCN measurement */ #define IP_PROTO_HMP 20 /* Host Monitoring Protocol */ #define IP_PROTO_PRM 21 /* Packet Radio Measurement */ #define IP_PROTO_IDP 22 /* Xerox NS IDP */ #define IP_PROTO_TRUNK1 23 /* Trunk-1 */ #define IP_PROTO_TRUNK2 24 /* Trunk-2 */ #define IP_PROTO_LEAF1 25 /* Leaf-1 */ #define IP_PROTO_LEAF2 26 /* Leaf-2 */ #define IP_PROTO_RDP 27 /* "Reliable Datagram" proto */ #define IP_PROTO_IRTP 28 /* Inet Reliable Transaction */ #define IP_PROTO_TP 29 /* ISO TP class 4 */ #define IP_PROTO_NETBLT 30 /* Bulk Data Transfer */ #define IP_PROTO_MFPNSP 31 /* MFE Network Services */ #define IP_PROTO_MERITINP 32 /* Merit Internodal Protocol */ #define IP_PROTO_SEP 33 /* Sequential Exchange proto */ #define IP_PROTO_3PC 34 /* Third Party Connect proto */ #define IP_PROTO_IDPR 35 /* Interdomain Policy Route */ #define IP_PROTO_XTP 36 /* Xpress Transfer Protocol */ #define IP_PROTO_DDP 37 /* Datagram Delivery Proto */ #define IP_PROTO_CMTP 38 /* IDPR Ctrl Message Trans */ #define IP_PROTO_TPPP 39 /* TP++ Transport Protocol */ #define IP_PROTO_IL 40 /* IL Transport Protocol */ #define IP_PROTO_IPV6 41 /* IPv6 */ #define IP_PROTO_SDRP 42 /* Source Demand Routing */ #define IP_PROTO_ROUTING 43 /* IPv6 routing header */ #define IP_PROTO_FRAGMENT 44 /* IPv6 fragmentation header */ #define IP_PROTO_RSVP 46 /* Reservation protocol */ #define IP_PROTO_GRE 47 /* General Routing Encap */ #define IP_PROTO_MHRP 48 /* Mobile Host Routing */ #define IP_PROTO_ENA 49 /* ENA */ #define IP_PROTO_ESP 50 /* Encap Security Payload */ #define IP_PROTO_AH 51 /* Authentication Header */ #define IP_PROTO_INLSP 52 /* Integated Net Layer Sec */ #define IP_PROTO_SWIPE 53 /* SWIPE */ #define IP_PROTO_NARP 54 /* NBMA Address Resolution */ #define IP_PROTO_MOBILE 55 /* Mobile IP, RFC 2004 */ #define IP_PROTO_TLSP 56 /* Transport Layer Security */ #define IP_PROTO_SKIP 57 /* SKIP */ #define IP_PROTO_ICMPV6 58 /* ICMP for IPv6 */ #define IP_PROTO_NONE 59 /* IPv6 no next header */ #define IP_PROTO_DSTOPTS 60 /* IPv6 destination options */ #define IP_PROTO_ANYHOST 61 /* any host internal proto */ #define IP_PROTO_CFTP 62 /* CFTP */ #define IP_PROTO_ANYNET 63 /* any local network */ #define IP_PROTO_EXPAK 64 /* SATNET and Backroom EXPAK */ #define IP_PROTO_KRYPTOLAN 65 /* Kryptolan */ #define IP_PROTO_RVD 66 /* MIT Remote Virtual Disk */ #define IP_PROTO_IPPC 67 /* Inet Pluribus Packet Core */ #define IP_PROTO_DISTFS 68 /* any distributed fs */ #define IP_PROTO_SATMON 69 /* SATNET Monitoring */ #define IP_PROTO_VISA 70 /* VISA Protocol */ #define IP_PROTO_IPCV 71 /* Inet Packet Core Utility */ #define IP_PROTO_CPNX 72 /* Comp Proto Net Executive */ #define IP_PROTO_CPHB 73 /* Comp Protocol Heart Beat */ #define IP_PROTO_WSN 74 /* Wang Span Network */ #define IP_PROTO_PVP 75 /* Packet Video Protocol */ #define IP_PROTO_BRSATMON 76 /* Backroom SATNET Monitor */ #define IP_PROTO_SUNND 77 /* SUN ND Protocol */ #define IP_PROTO_WBMON 78 /* WIDEBAND Monitoring */ #define IP_PROTO_WBEXPAK 79 /* WIDEBAND EXPAK */ #define IP_PROTO_EON 80 /* ISO CNLP */ #define IP_PROTO_VMTP 81 /* Versatile Msg Transport*/ #define IP_PROTO_SVMTP 82 /* Secure VMTP */ #define IP_PROTO_VINES 83 /* VINES */ #define IP_PROTO_TTP 84 /* TTP */ #define IP_PROTO_NSFIGP 85 /* NSFNET-IGP */ #define IP_PROTO_DGP 86 /* Dissimilar Gateway Proto */ #define IP_PROTO_TCF 87 /* TCF */ #define IP_PROTO_EIGRP 88 /* EIGRP */ #define IP_PROTO_OSPF 89 /* Open Shortest Path First */ #define IP_PROTO_SPRITERPC 90 /* Sprite RPC Protocol */ #define IP_PROTO_LARP 91 /* Locus Address Resolution */ #define IP_PROTO_MTP 92 /* Multicast Transport Proto */ #define IP_PROTO_AX25 93 /* AX.25 Frames */ #define IP_PROTO_IPIPENCAP 94 /* yet-another IP encap */ #define IP_PROTO_MICP 95 /* Mobile Internet Ctrl */ #define IP_PROTO_SCCSP 96 /* Semaphore Comm Sec Proto */ #define IP_PROTO_ETHERIP 97 /* Ethernet in IPv4 */ #define IP_PROTO_ENCAP 98 /* encapsulation header */ #define IP_PROTO_ANYENC 99 /* private encryption scheme */ #define IP_PROTO_GMTP 100 /* GMTP */ #define IP_PROTO_IFMP 101 /* Ipsilon Flow Mgmt Proto */ #define IP_PROTO_PNNI 102 /* PNNI over IP */ #define IP_PROTO_PIM 103 /* Protocol Indep Multicast */ #define IP_PROTO_ARIS 104 /* ARIS */ #define IP_PROTO_SCPS 105 /* SCPS */ #define IP_PROTO_QNX 106 /* QNX */ #define IP_PROTO_AN 107 /* Active Networks */ #define IP_PROTO_IPCOMP 108 /* IP Payload Compression */ #define IP_PROTO_SNP 109 /* Sitara Networks Protocol */ #define IP_PROTO_COMPAQPEER 110 /* Compaq Peer Protocol */ #define IP_PROTO_IPXIP 111 /* IPX in IP */ #define IP_PROTO_VRRP 112 /* Virtual Router Redundancy */ #define IP_PROTO_PGM 113 /* PGM Reliable Transport */ #define IP_PROTO_ANY0HOP 114 /* 0-hop protocol */ #define IP_PROTO_L2TP 115 /* Layer 2 Tunneling Proto */ #define IP_PROTO_DDX 116 /* D-II Data Exchange (DDX) */ #define IP_PROTO_IATP 117 /* Interactive Agent Xfer */ #define IP_PROTO_STP 118 /* Schedule Transfer Proto */ #define IP_PROTO_SRP 119 /* SpectraLink Radio Proto */ #define IP_PROTO_UTI 120 /* UTI */ #define IP_PROTO_SMP 121 /* Simple Message Protocol */ #define IP_PROTO_SM 122 /* SM */ #define IP_PROTO_PTP 123 /* Performance Transparency */ #define IP_PROTO_ISIS 124 /* ISIS over IPv4 */ #define IP_PROTO_FIRE 125 /* FIRE */ #define IP_PROTO_CRTP 126 /* Combat Radio Transport */ #define IP_PROTO_CRUDP 127 /* Combat Radio UDP */ #define IP_PROTO_SSCOPMCE 128 /* SSCOPMCE */ #define IP_PROTO_IPLT 129 /* IPLT */ #define IP_PROTO_SPS 130 /* Secure Packet Shield */ #define IP_PROTO_PIPE 131 /* Private IP Encap in IP */ #define IP_PROTO_SCTP 132 /* Stream Ctrl Transmission */ #define IP_PROTO_FC 133 /* Fibre Channel */ #define IP_PROTO_RSVPIGN 134 /* RSVP-E2E-IGNORE */ #define IP_PROTO_RAW 255 /* Raw IP packets */ #define IP_PROTO_RESERVED IP_PROTO_RAW /* Reserved */ #define IP_PROTO_MAX 255 /* * Option types (opt_type) - http://www.iana.org/assignments/ip-parameters */ #define IP_OPT_CONTROL 0x00 /* control */ #define IP_OPT_DEBMEAS 0x40 /* debugging & measurement */ #define IP_OPT_COPY 0x80 /* copy into all fragments */ #define IP_OPT_RESERVED1 0x20 #define IP_OPT_RESERVED2 0x60 #define IP_OPT_EOL 0 /* end of option list */ #define IP_OPT_NOP 1 /* no operation */ #define IP_OPT_SEC (2|IP_OPT_COPY) /* DoD basic security */ #define IP_OPT_LSRR (3|IP_OPT_COPY) /* loose source route */ #define IP_OPT_TS (4|IP_OPT_DEBMEAS) /* timestamp */ #define IP_OPT_ESEC (5|IP_OPT_COPY) /* DoD extended security */ #define IP_OPT_CIPSO (6|IP_OPT_COPY) /* commercial security */ #define IP_OPT_RR 7 /* record route */ #define IP_OPT_SATID (8|IP_OPT_COPY) /* stream ID (obsolete) */ #define IP_OPT_SSRR (9|IP_OPT_COPY) /* strict source route */ #define IP_OPT_ZSU 10 /* experimental measurement */ #define IP_OPT_MTUP 11 /* MTU probe */ #define IP_OPT_MTUR 12 /* MTU reply */ #define IP_OPT_FINN (13|IP_OPT_COPY|IP_OPT_DEBMEAS) /* exp flow control */ #define IP_OPT_VISA (14|IP_OPT_COPY) /* exp access control */ #define IP_OPT_ENCODE 15 /* ??? */ #define IP_OPT_IMITD (16|IP_OPT_COPY) /* IMI traffic descriptor */ #define IP_OPT_EIP (17|IP_OPT_COPY) /* extended IP, RFC 1385 */ #define IP_OPT_TR (18|IP_OPT_DEBMEAS) /* traceroute */ #define IP_OPT_ADDEXT (19|IP_OPT_COPY) /* IPv7 ext addr, RFC 1475 */ #define IP_OPT_RTRALT (20|IP_OPT_COPY) /* router alert, RFC 2113 */ #define IP_OPT_SDB (21|IP_OPT_COPY) /* directed bcast, RFC 1770 */ #define IP_OPT_NSAPA (22|IP_OPT_COPY) /* NSAP addresses */ #define IP_OPT_DPS (23|IP_OPT_COPY) /* dynamic packet state */ #define IP_OPT_UMP (24|IP_OPT_COPY) /* upstream multicast */ #define IP_OPT_MAX 25 #define IP_OPT_COPIED(o) ((o) & 0x80) #define IP_OPT_CLASS(o) ((o) & 0x60) #define IP_OPT_NUMBER(o) ((o) & 0x1f) #define IP_OPT_TYPEONLY(o) ((o) == IP_OPT_EOL || (o) == IP_OPT_NOP) /* * Security option data - RFC 791, 3.1 */ struct ip_opt_data_sec { uint16_t s; /* security */ uint16_t c; /* compartments */ uint16_t h; /* handling restrictions */ uint8_t tcc[3]; /* transmission control code */ } __attribute__((__packed__)); #define IP_OPT_SEC_UNCLASS 0x0000 /* unclassified */ #define IP_OPT_SEC_CONFID 0xf135 /* confidential */ #define IP_OPT_SEC_EFTO 0x789a /* EFTO */ #define IP_OPT_SEC_MMMM 0xbc4d /* MMMM */ #define IP_OPT_SEC_PROG 0x5e26 /* PROG */ #define IP_OPT_SEC_RESTR 0xaf13 /* restricted */ #define IP_OPT_SEC_SECRET 0xd788 /* secret */ #define IP_OPT_SEC_TOPSECRET 0x6bc5 /* top secret */ /* * {Loose Source, Record, Strict Source} Route option data - RFC 791, 3.1 */ struct ip_opt_data_rr { uint8_t ptr; /* from start of option, >= 4 */ uint32_t iplist __flexarr; /* list of IP addresses */ } __attribute__((__packed__)); /* * Timestamp option data - RFC 791, 3.1 */ struct ip_opt_data_ts { uint8_t ptr; /* from start of option, >= 5 */ #if DNET_BYTESEX == DNET_BIG_ENDIAN uint8_t oflw:4, /* number of IPs skipped */ flg:4; /* address[ / timestamp] flag */ #elif DNET_BYTESEX == DNET_LIL_ENDIAN uint8_t flg:4, oflw:4; #endif uint32_t ipts __flexarr; /* IP address [/ timestamp] pairs */ } __attribute__((__packed__)); #define IP_OPT_TS_TSONLY 0 /* timestamps only */ #define IP_OPT_TS_TSADDR 1 /* IP address / timestamp pairs */ #define IP_OPT_TS_PRESPEC 3 /* IP address / zero timestamp pairs */ /* * Traceroute option data - RFC 1393, 2.2 */ struct ip_opt_data_tr { uint16_t id; /* ID number */ uint16_t ohc; /* outbound hop count */ uint16_t rhc; /* return hop count */ uint32_t origip; /* originator IP address */ } __attribute__((__packed__)); /* * IP option (following IP header) */ struct ip_opt { uint8_t opt_type; /* option type */ uint8_t opt_len; /* option length >= IP_OPT_LEN */ union ip_opt_data { struct ip_opt_data_sec sec; /* IP_OPT_SEC */ struct ip_opt_data_rr rr; /* IP_OPT_{L,S}RR */ struct ip_opt_data_ts ts; /* IP_OPT_TS */ uint16_t satid; /* IP_OPT_SATID */ uint16_t mtu; /* IP_OPT_MTU{P,R} */ struct ip_opt_data_tr tr; /* IP_OPT_TR */ uint32_t addext[2]; /* IP_OPT_ADDEXT */ uint16_t rtralt; /* IP_OPT_RTRALT */ uint32_t sdb[9]; /* IP_OPT_SDB */ uint8_t data8[IP_OPT_LEN_MAX - IP_OPT_LEN]; } opt_data; } __attribute__((__packed__)); #ifndef __GNUC__ # pragma pack() #endif /* * Classful addressing */ #define IP_CLASSA(i) (((uint32_t)(i) & htonl(0x80000000)) == \ htonl(0x00000000)) #define IP_CLASSA_NET (htonl(0xff000000)) #define IP_CLASSA_NSHIFT 24 #define IP_CLASSA_HOST (htonl(0x00ffffff)) #define IP_CLASSA_MAX 128 #define IP_CLASSB(i) (((uint32_t)(i) & htonl(0xc0000000)) == \ htonl(0x80000000)) #define IP_CLASSB_NET (htonl(0xffff0000)) #define IP_CLASSB_NSHIFT 16 #define IP_CLASSB_HOST (htonl(0x0000ffff)) #define IP_CLASSB_MAX 65536 #define IP_CLASSC(i) (((uint32_t)(i) & htonl(0xe0000000)) == \ htonl(0xc0000000)) #define IP_CLASSC_NET (htonl(0xffffff00)) #define IP_CLASSC_NSHIFT 8 #define IP_CLASSC_HOST (htonl(0x000000ff)) #define IP_CLASSD(i) (((uint32_t)(i) & htonl(0xf0000000)) == \ htonl(0xe0000000)) /* These ones aren't really net and host fields, but routing needn't know. */ #define IP_CLASSD_NET (htonl(0xf0000000)) #define IP_CLASSD_NSHIFT 28 #define IP_CLASSD_HOST (htonl(0x0fffffff)) #define IP_MULTICAST(i) IP_CLASSD(i) #define IP_EXPERIMENTAL(i) (((uint32_t)(i) & htonl(0xf0000000)) == \ htonl(0xf0000000)) #define IP_BADCLASS(i) (((uint32_t)(i) & htonl(0xf0000000)) == \ htonl(0xf0000000)) #define IP_LOCAL_GROUP(i) (((uint32_t)(i) & htonl(0xffffff00)) == \ htonl(0xe0000000)) /* * Reserved addresses */ #define IP_ADDR_ANY (htonl(0x00000000)) /* 0.0.0.0 */ #define IP_ADDR_BROADCAST (htonl(0xffffffff)) /* 255.255.255.255 */ #define IP_ADDR_LOOPBACK (htonl(0x7f000001)) /* 127.0.0.1 */ #define IP_ADDR_MCAST_ALL (htonl(0xe0000001)) /* 224.0.0.1 */ #define IP_ADDR_MCAST_LOCAL (htonl(0xe00000ff)) /* 224.0.0.225 */ #define ip_pack_hdr(hdr, tos, len, id, off, ttl, p, src, dst) do { \ struct ip_hdr *ip_pack_p = (struct ip_hdr *)(hdr); \ ip_pack_p->ip_v = 4; ip_pack_p->ip_hl = 5; \ ip_pack_p->ip_tos = tos; ip_pack_p->ip_len = htons(len); \ ip_pack_p->ip_id = htons(id); ip_pack_p->ip_off = htons(off); \ ip_pack_p->ip_ttl = ttl; ip_pack_p->ip_p = p; \ ip_pack_p->ip_src = src; ip_pack_p->ip_dst = dst; \ } while (0) typedef struct ip_handle ip_t; __BEGIN_DECLS ip_t *ip_open(void); size_t ip_send(ip_t *i, const void *buf, size_t len); ip_t *ip_close(ip_t *i); char *ip_ntop(const ip_addr_t *ip, char *dst, size_t len); int ip_pton(const char *src, ip_addr_t *dst); char *ip_ntoa(const ip_addr_t *ip); #define ip_aton ip_pton size_t ip_add_option(void *buf, size_t len, int proto, const void *optbuf, size_t optlen); void ip_checksum(void *buf, size_t len); inline int ip_cksum_add(const void *buf, size_t len, int cksum) { uint16_t *sp = (uint16_t *)buf; int n, sn; sn = len / 2; n = (sn + 15) / 16; /* XXX - unroll loop using Duff's device. */ switch (sn % 16) { case 0: do { cksum += *sp++; case 15: cksum += *sp++; case 14: cksum += *sp++; case 13: cksum += *sp++; case 12: cksum += *sp++; case 11: cksum += *sp++; case 10: cksum += *sp++; case 9: cksum += *sp++; case 8: cksum += *sp++; case 7: cksum += *sp++; case 6: cksum += *sp++; case 5: cksum += *sp++; case 4: cksum += *sp++; case 3: cksum += *sp++; case 2: cksum += *sp++; case 1: cksum += *sp++; } while (--n > 0); } if (len & 1) cksum += htons(*(u_char *)sp << 8); return (cksum); } inline uint16_t ip_cksum_carry(int x) { x = (x >> 16) + (x & 0xffff); return ~(x + (x >> 16)) & 0xffff; } __END_DECLS #endif /* DNET_IP_H */