1*1da177e4SLinus Torvalds /* 2*1da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 3*1da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 4*1da177e4SLinus Torvalds * interface as the means of communication with the user level. 5*1da177e4SLinus Torvalds * 6*1da177e4SLinus Torvalds * Definitions for the IP protocol. 7*1da177e4SLinus Torvalds * 8*1da177e4SLinus Torvalds * Version: @(#)ip.h 1.0.2 04/28/93 9*1da177e4SLinus Torvalds * 10*1da177e4SLinus Torvalds * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11*1da177e4SLinus Torvalds * 12*1da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 13*1da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 14*1da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 15*1da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 16*1da177e4SLinus Torvalds */ 17*1da177e4SLinus Torvalds #ifndef _LINUX_IP_H 18*1da177e4SLinus Torvalds #define _LINUX_IP_H 19*1da177e4SLinus Torvalds #include <asm/byteorder.h> 20*1da177e4SLinus Torvalds 21*1da177e4SLinus Torvalds #define IPTOS_TOS_MASK 0x1E 22*1da177e4SLinus Torvalds #define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK) 23*1da177e4SLinus Torvalds #define IPTOS_LOWDELAY 0x10 24*1da177e4SLinus Torvalds #define IPTOS_THROUGHPUT 0x08 25*1da177e4SLinus Torvalds #define IPTOS_RELIABILITY 0x04 26*1da177e4SLinus Torvalds #define IPTOS_MINCOST 0x02 27*1da177e4SLinus Torvalds 28*1da177e4SLinus Torvalds #define IPTOS_PREC_MASK 0xE0 29*1da177e4SLinus Torvalds #define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK) 30*1da177e4SLinus Torvalds #define IPTOS_PREC_NETCONTROL 0xe0 31*1da177e4SLinus Torvalds #define IPTOS_PREC_INTERNETCONTROL 0xc0 32*1da177e4SLinus Torvalds #define IPTOS_PREC_CRITIC_ECP 0xa0 33*1da177e4SLinus Torvalds #define IPTOS_PREC_FLASHOVERRIDE 0x80 34*1da177e4SLinus Torvalds #define IPTOS_PREC_FLASH 0x60 35*1da177e4SLinus Torvalds #define IPTOS_PREC_IMMEDIATE 0x40 36*1da177e4SLinus Torvalds #define IPTOS_PREC_PRIORITY 0x20 37*1da177e4SLinus Torvalds #define IPTOS_PREC_ROUTINE 0x00 38*1da177e4SLinus Torvalds 39*1da177e4SLinus Torvalds 40*1da177e4SLinus Torvalds /* IP options */ 41*1da177e4SLinus Torvalds #define IPOPT_COPY 0x80 42*1da177e4SLinus Torvalds #define IPOPT_CLASS_MASK 0x60 43*1da177e4SLinus Torvalds #define IPOPT_NUMBER_MASK 0x1f 44*1da177e4SLinus Torvalds 45*1da177e4SLinus Torvalds #define IPOPT_COPIED(o) ((o)&IPOPT_COPY) 46*1da177e4SLinus Torvalds #define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK) 47*1da177e4SLinus Torvalds #define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK) 48*1da177e4SLinus Torvalds 49*1da177e4SLinus Torvalds #define IPOPT_CONTROL 0x00 50*1da177e4SLinus Torvalds #define IPOPT_RESERVED1 0x20 51*1da177e4SLinus Torvalds #define IPOPT_MEASUREMENT 0x40 52*1da177e4SLinus Torvalds #define IPOPT_RESERVED2 0x60 53*1da177e4SLinus Torvalds 54*1da177e4SLinus Torvalds #define IPOPT_END (0 |IPOPT_CONTROL) 55*1da177e4SLinus Torvalds #define IPOPT_NOOP (1 |IPOPT_CONTROL) 56*1da177e4SLinus Torvalds #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) 57*1da177e4SLinus Torvalds #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY) 58*1da177e4SLinus Torvalds #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) 59*1da177e4SLinus Torvalds #define IPOPT_RR (7 |IPOPT_CONTROL) 60*1da177e4SLinus Torvalds #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) 61*1da177e4SLinus Torvalds #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY) 62*1da177e4SLinus Torvalds #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) 63*1da177e4SLinus Torvalds 64*1da177e4SLinus Torvalds #define IPVERSION 4 65*1da177e4SLinus Torvalds #define MAXTTL 255 66*1da177e4SLinus Torvalds #define IPDEFTTL 64 67*1da177e4SLinus Torvalds 68*1da177e4SLinus Torvalds #define IPOPT_OPTVAL 0 69*1da177e4SLinus Torvalds #define IPOPT_OLEN 1 70*1da177e4SLinus Torvalds #define IPOPT_OFFSET 2 71*1da177e4SLinus Torvalds #define IPOPT_MINOFF 4 72*1da177e4SLinus Torvalds #define MAX_IPOPTLEN 40 73*1da177e4SLinus Torvalds #define IPOPT_NOP IPOPT_NOOP 74*1da177e4SLinus Torvalds #define IPOPT_EOL IPOPT_END 75*1da177e4SLinus Torvalds #define IPOPT_TS IPOPT_TIMESTAMP 76*1da177e4SLinus Torvalds 77*1da177e4SLinus Torvalds #define IPOPT_TS_TSONLY 0 /* timestamps only */ 78*1da177e4SLinus Torvalds #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 79*1da177e4SLinus Torvalds #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 80*1da177e4SLinus Torvalds 81*1da177e4SLinus Torvalds #ifdef __KERNEL__ 82*1da177e4SLinus Torvalds #include <linux/config.h> 83*1da177e4SLinus Torvalds #include <linux/types.h> 84*1da177e4SLinus Torvalds #include <net/sock.h> 85*1da177e4SLinus Torvalds #include <linux/igmp.h> 86*1da177e4SLinus Torvalds #include <net/flow.h> 87*1da177e4SLinus Torvalds 88*1da177e4SLinus Torvalds struct ip_options { 89*1da177e4SLinus Torvalds __u32 faddr; /* Saved first hop address */ 90*1da177e4SLinus Torvalds unsigned char optlen; 91*1da177e4SLinus Torvalds unsigned char srr; 92*1da177e4SLinus Torvalds unsigned char rr; 93*1da177e4SLinus Torvalds unsigned char ts; 94*1da177e4SLinus Torvalds unsigned char is_setbyuser:1, /* Set by setsockopt? */ 95*1da177e4SLinus Torvalds is_data:1, /* Options in __data, rather than skb */ 96*1da177e4SLinus Torvalds is_strictroute:1, /* Strict source route */ 97*1da177e4SLinus Torvalds srr_is_hit:1, /* Packet destination addr was our one */ 98*1da177e4SLinus Torvalds is_changed:1, /* IP checksum more not valid */ 99*1da177e4SLinus Torvalds rr_needaddr:1, /* Need to record addr of outgoing dev */ 100*1da177e4SLinus Torvalds ts_needtime:1, /* Need to record timestamp */ 101*1da177e4SLinus Torvalds ts_needaddr:1; /* Need to record addr of outgoing dev */ 102*1da177e4SLinus Torvalds unsigned char router_alert; 103*1da177e4SLinus Torvalds unsigned char __pad1; 104*1da177e4SLinus Torvalds unsigned char __pad2; 105*1da177e4SLinus Torvalds unsigned char __data[0]; 106*1da177e4SLinus Torvalds }; 107*1da177e4SLinus Torvalds 108*1da177e4SLinus Torvalds #define optlength(opt) (sizeof(struct ip_options) + opt->optlen) 109*1da177e4SLinus Torvalds 110*1da177e4SLinus Torvalds struct ipv6_pinfo; 111*1da177e4SLinus Torvalds 112*1da177e4SLinus Torvalds struct inet_sock { 113*1da177e4SLinus Torvalds /* sk and pinet6 has to be the first two members of inet_sock */ 114*1da177e4SLinus Torvalds struct sock sk; 115*1da177e4SLinus Torvalds #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 116*1da177e4SLinus Torvalds struct ipv6_pinfo *pinet6; 117*1da177e4SLinus Torvalds #endif 118*1da177e4SLinus Torvalds /* Socket demultiplex comparisons on incoming packets. */ 119*1da177e4SLinus Torvalds __u32 daddr; /* Foreign IPv4 addr */ 120*1da177e4SLinus Torvalds __u32 rcv_saddr; /* Bound local IPv4 addr */ 121*1da177e4SLinus Torvalds __u16 dport; /* Destination port */ 122*1da177e4SLinus Torvalds __u16 num; /* Local port */ 123*1da177e4SLinus Torvalds __u32 saddr; /* Sending source */ 124*1da177e4SLinus Torvalds __s16 uc_ttl; /* Unicast TTL */ 125*1da177e4SLinus Torvalds __u16 cmsg_flags; 126*1da177e4SLinus Torvalds struct ip_options *opt; 127*1da177e4SLinus Torvalds __u16 sport; /* Source port */ 128*1da177e4SLinus Torvalds __u16 id; /* ID counter for DF pkts */ 129*1da177e4SLinus Torvalds __u8 tos; /* TOS */ 130*1da177e4SLinus Torvalds __u8 mc_ttl; /* Multicasting TTL */ 131*1da177e4SLinus Torvalds __u8 pmtudisc; 132*1da177e4SLinus Torvalds unsigned recverr : 1, 133*1da177e4SLinus Torvalds freebind : 1, 134*1da177e4SLinus Torvalds hdrincl : 1, 135*1da177e4SLinus Torvalds mc_loop : 1; 136*1da177e4SLinus Torvalds int mc_index; /* Multicast device index */ 137*1da177e4SLinus Torvalds __u32 mc_addr; 138*1da177e4SLinus Torvalds struct ip_mc_socklist *mc_list; /* Group array */ 139*1da177e4SLinus Torvalds /* 140*1da177e4SLinus Torvalds * Following members are used to retain the infomation to build 141*1da177e4SLinus Torvalds * an ip header on each ip fragmentation while the socket is corked. 142*1da177e4SLinus Torvalds */ 143*1da177e4SLinus Torvalds struct { 144*1da177e4SLinus Torvalds unsigned int flags; 145*1da177e4SLinus Torvalds unsigned int fragsize; 146*1da177e4SLinus Torvalds struct ip_options *opt; 147*1da177e4SLinus Torvalds struct rtable *rt; 148*1da177e4SLinus Torvalds int length; /* Total length of all frames */ 149*1da177e4SLinus Torvalds u32 addr; 150*1da177e4SLinus Torvalds struct flowi fl; 151*1da177e4SLinus Torvalds } cork; 152*1da177e4SLinus Torvalds }; 153*1da177e4SLinus Torvalds 154*1da177e4SLinus Torvalds #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 155*1da177e4SLinus Torvalds #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 156*1da177e4SLinus Torvalds 157*1da177e4SLinus Torvalds static inline struct inet_sock *inet_sk(const struct sock *sk) 158*1da177e4SLinus Torvalds { 159*1da177e4SLinus Torvalds return (struct inet_sock *)sk; 160*1da177e4SLinus Torvalds } 161*1da177e4SLinus Torvalds 162*1da177e4SLinus Torvalds static inline void __inet_sk_copy_descendant(struct sock *sk_to, 163*1da177e4SLinus Torvalds const struct sock *sk_from, 164*1da177e4SLinus Torvalds const int ancestor_size) 165*1da177e4SLinus Torvalds { 166*1da177e4SLinus Torvalds memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 167*1da177e4SLinus Torvalds sk_from->sk_prot->obj_size - ancestor_size); 168*1da177e4SLinus Torvalds } 169*1da177e4SLinus Torvalds #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 170*1da177e4SLinus Torvalds static inline void inet_sk_copy_descendant(struct sock *sk_to, 171*1da177e4SLinus Torvalds const struct sock *sk_from) 172*1da177e4SLinus Torvalds { 173*1da177e4SLinus Torvalds __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 174*1da177e4SLinus Torvalds } 175*1da177e4SLinus Torvalds #endif 176*1da177e4SLinus Torvalds #endif 177*1da177e4SLinus Torvalds 178*1da177e4SLinus Torvalds struct iphdr { 179*1da177e4SLinus Torvalds #if defined(__LITTLE_ENDIAN_BITFIELD) 180*1da177e4SLinus Torvalds __u8 ihl:4, 181*1da177e4SLinus Torvalds version:4; 182*1da177e4SLinus Torvalds #elif defined (__BIG_ENDIAN_BITFIELD) 183*1da177e4SLinus Torvalds __u8 version:4, 184*1da177e4SLinus Torvalds ihl:4; 185*1da177e4SLinus Torvalds #else 186*1da177e4SLinus Torvalds #error "Please fix <asm/byteorder.h>" 187*1da177e4SLinus Torvalds #endif 188*1da177e4SLinus Torvalds __u8 tos; 189*1da177e4SLinus Torvalds __u16 tot_len; 190*1da177e4SLinus Torvalds __u16 id; 191*1da177e4SLinus Torvalds __u16 frag_off; 192*1da177e4SLinus Torvalds __u8 ttl; 193*1da177e4SLinus Torvalds __u8 protocol; 194*1da177e4SLinus Torvalds __u16 check; 195*1da177e4SLinus Torvalds __u32 saddr; 196*1da177e4SLinus Torvalds __u32 daddr; 197*1da177e4SLinus Torvalds /*The options start here. */ 198*1da177e4SLinus Torvalds }; 199*1da177e4SLinus Torvalds 200*1da177e4SLinus Torvalds struct ip_auth_hdr { 201*1da177e4SLinus Torvalds __u8 nexthdr; 202*1da177e4SLinus Torvalds __u8 hdrlen; /* This one is measured in 32 bit units! */ 203*1da177e4SLinus Torvalds __u16 reserved; 204*1da177e4SLinus Torvalds __u32 spi; 205*1da177e4SLinus Torvalds __u32 seq_no; /* Sequence number */ 206*1da177e4SLinus Torvalds __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */ 207*1da177e4SLinus Torvalds }; 208*1da177e4SLinus Torvalds 209*1da177e4SLinus Torvalds struct ip_esp_hdr { 210*1da177e4SLinus Torvalds __u32 spi; 211*1da177e4SLinus Torvalds __u32 seq_no; /* Sequence number */ 212*1da177e4SLinus Torvalds __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */ 213*1da177e4SLinus Torvalds }; 214*1da177e4SLinus Torvalds 215*1da177e4SLinus Torvalds struct ip_comp_hdr { 216*1da177e4SLinus Torvalds __u8 nexthdr; 217*1da177e4SLinus Torvalds __u8 flags; 218*1da177e4SLinus Torvalds __u16 cpi; 219*1da177e4SLinus Torvalds }; 220*1da177e4SLinus Torvalds 221*1da177e4SLinus Torvalds #endif /* _LINUX_IP_H */ 222