1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for the IP protocol. 7 * 8 * Version: @(#)ip.h 1.0.2 04/28/93 9 * 10 * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17 #ifndef _LINUX_IP_H 18 #define _LINUX_IP_H 19 #include <asm/byteorder.h> 20 21 #define IPTOS_TOS_MASK 0x1E 22 #define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK) 23 #define IPTOS_LOWDELAY 0x10 24 #define IPTOS_THROUGHPUT 0x08 25 #define IPTOS_RELIABILITY 0x04 26 #define IPTOS_MINCOST 0x02 27 28 #define IPTOS_PREC_MASK 0xE0 29 #define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK) 30 #define IPTOS_PREC_NETCONTROL 0xe0 31 #define IPTOS_PREC_INTERNETCONTROL 0xc0 32 #define IPTOS_PREC_CRITIC_ECP 0xa0 33 #define IPTOS_PREC_FLASHOVERRIDE 0x80 34 #define IPTOS_PREC_FLASH 0x60 35 #define IPTOS_PREC_IMMEDIATE 0x40 36 #define IPTOS_PREC_PRIORITY 0x20 37 #define IPTOS_PREC_ROUTINE 0x00 38 39 40 /* IP options */ 41 #define IPOPT_COPY 0x80 42 #define IPOPT_CLASS_MASK 0x60 43 #define IPOPT_NUMBER_MASK 0x1f 44 45 #define IPOPT_COPIED(o) ((o)&IPOPT_COPY) 46 #define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK) 47 #define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK) 48 49 #define IPOPT_CONTROL 0x00 50 #define IPOPT_RESERVED1 0x20 51 #define IPOPT_MEASUREMENT 0x40 52 #define IPOPT_RESERVED2 0x60 53 54 #define IPOPT_END (0 |IPOPT_CONTROL) 55 #define IPOPT_NOOP (1 |IPOPT_CONTROL) 56 #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) 57 #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY) 58 #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) 59 #define IPOPT_RR (7 |IPOPT_CONTROL) 60 #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) 61 #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY) 62 #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) 63 64 #define IPVERSION 4 65 #define MAXTTL 255 66 #define IPDEFTTL 64 67 68 #define IPOPT_OPTVAL 0 69 #define IPOPT_OLEN 1 70 #define IPOPT_OFFSET 2 71 #define IPOPT_MINOFF 4 72 #define MAX_IPOPTLEN 40 73 #define IPOPT_NOP IPOPT_NOOP 74 #define IPOPT_EOL IPOPT_END 75 #define IPOPT_TS IPOPT_TIMESTAMP 76 77 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 78 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 79 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 80 81 #ifdef __KERNEL__ 82 #include <linux/config.h> 83 #include <linux/types.h> 84 #include <net/request_sock.h> 85 #include <net/sock.h> 86 #include <linux/igmp.h> 87 #include <net/flow.h> 88 89 struct ip_options { 90 __u32 faddr; /* Saved first hop address */ 91 unsigned char optlen; 92 unsigned char srr; 93 unsigned char rr; 94 unsigned char ts; 95 unsigned char is_setbyuser:1, /* Set by setsockopt? */ 96 is_data:1, /* Options in __data, rather than skb */ 97 is_strictroute:1, /* Strict source route */ 98 srr_is_hit:1, /* Packet destination addr was our one */ 99 is_changed:1, /* IP checksum more not valid */ 100 rr_needaddr:1, /* Need to record addr of outgoing dev */ 101 ts_needtime:1, /* Need to record timestamp */ 102 ts_needaddr:1; /* Need to record addr of outgoing dev */ 103 unsigned char router_alert; 104 unsigned char __pad1; 105 unsigned char __pad2; 106 unsigned char __data[0]; 107 }; 108 109 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen) 110 111 struct inet_request_sock { 112 struct request_sock req; 113 u32 loc_addr; 114 u32 rmt_addr; 115 u16 rmt_port; 116 u16 snd_wscale : 4, 117 rcv_wscale : 4, 118 tstamp_ok : 1, 119 sack_ok : 1, 120 wscale_ok : 1, 121 ecn_ok : 1, 122 acked : 1; 123 struct ip_options *opt; 124 }; 125 126 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 127 { 128 return (struct inet_request_sock *)sk; 129 } 130 131 struct ipv6_pinfo; 132 133 struct inet_sock { 134 /* sk and pinet6 has to be the first two members of inet_sock */ 135 struct sock sk; 136 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 137 struct ipv6_pinfo *pinet6; 138 #endif 139 /* Socket demultiplex comparisons on incoming packets. */ 140 __u32 daddr; /* Foreign IPv4 addr */ 141 __u32 rcv_saddr; /* Bound local IPv4 addr */ 142 __u16 dport; /* Destination port */ 143 __u16 num; /* Local port */ 144 __u32 saddr; /* Sending source */ 145 __s16 uc_ttl; /* Unicast TTL */ 146 __u16 cmsg_flags; 147 struct ip_options *opt; 148 __u16 sport; /* Source port */ 149 __u16 id; /* ID counter for DF pkts */ 150 __u8 tos; /* TOS */ 151 __u8 mc_ttl; /* Multicasting TTL */ 152 __u8 pmtudisc; 153 unsigned recverr : 1, 154 freebind : 1, 155 hdrincl : 1, 156 mc_loop : 1; 157 int mc_index; /* Multicast device index */ 158 __u32 mc_addr; 159 struct ip_mc_socklist *mc_list; /* Group array */ 160 /* 161 * Following members are used to retain the infomation to build 162 * an ip header on each ip fragmentation while the socket is corked. 163 */ 164 struct { 165 unsigned int flags; 166 unsigned int fragsize; 167 struct ip_options *opt; 168 struct rtable *rt; 169 int length; /* Total length of all frames */ 170 u32 addr; 171 struct flowi fl; 172 } cork; 173 }; 174 175 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 176 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 177 178 static inline struct inet_sock *inet_sk(const struct sock *sk) 179 { 180 return (struct inet_sock *)sk; 181 } 182 183 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 184 const struct sock *sk_from, 185 const int ancestor_size) 186 { 187 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 188 sk_from->sk_prot->obj_size - ancestor_size); 189 } 190 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 191 static inline void inet_sk_copy_descendant(struct sock *sk_to, 192 const struct sock *sk_from) 193 { 194 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 195 } 196 #endif 197 #endif 198 199 extern int inet_sk_rebuild_header(struct sock *sk); 200 201 struct iphdr { 202 #if defined(__LITTLE_ENDIAN_BITFIELD) 203 __u8 ihl:4, 204 version:4; 205 #elif defined (__BIG_ENDIAN_BITFIELD) 206 __u8 version:4, 207 ihl:4; 208 #else 209 #error "Please fix <asm/byteorder.h>" 210 #endif 211 __u8 tos; 212 __u16 tot_len; 213 __u16 id; 214 __u16 frag_off; 215 __u8 ttl; 216 __u8 protocol; 217 __u16 check; 218 __u32 saddr; 219 __u32 daddr; 220 /*The options start here. */ 221 }; 222 223 struct ip_auth_hdr { 224 __u8 nexthdr; 225 __u8 hdrlen; /* This one is measured in 32 bit units! */ 226 __u16 reserved; 227 __u32 spi; 228 __u32 seq_no; /* Sequence number */ 229 __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */ 230 }; 231 232 struct ip_esp_hdr { 233 __u32 spi; 234 __u32 seq_no; /* Sequence number */ 235 __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */ 236 }; 237 238 struct ip_comp_hdr { 239 __u8 nexthdr; 240 __u8 flags; 241 __u16 cpi; 242 }; 243 244 #endif /* _LINUX_IP_H */ 245