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, <[email protected]> 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 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 114 u16 inet6_rsk_offset; 115 /* 2 bytes hole, try to pack */ 116 #endif 117 u32 loc_addr; 118 u32 rmt_addr; 119 u16 rmt_port; 120 u16 snd_wscale : 4, 121 rcv_wscale : 4, 122 tstamp_ok : 1, 123 sack_ok : 1, 124 wscale_ok : 1, 125 ecn_ok : 1, 126 acked : 1; 127 struct ip_options *opt; 128 }; 129 130 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk) 131 { 132 return (struct inet_request_sock *)sk; 133 } 134 135 struct ipv6_pinfo; 136 137 struct inet_sock { 138 /* sk and pinet6 has to be the first two members of inet_sock */ 139 struct sock sk; 140 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 141 struct ipv6_pinfo *pinet6; 142 #endif 143 /* Socket demultiplex comparisons on incoming packets. */ 144 __u32 daddr; /* Foreign IPv4 addr */ 145 __u32 rcv_saddr; /* Bound local IPv4 addr */ 146 __u16 dport; /* Destination port */ 147 __u16 num; /* Local port */ 148 __u32 saddr; /* Sending source */ 149 __s16 uc_ttl; /* Unicast TTL */ 150 __u16 cmsg_flags; 151 struct ip_options *opt; 152 __u16 sport; /* Source port */ 153 __u16 id; /* ID counter for DF pkts */ 154 __u8 tos; /* TOS */ 155 __u8 mc_ttl; /* Multicasting TTL */ 156 __u8 pmtudisc; 157 unsigned recverr : 1, 158 is_icsk : 1, /* inet_connection_sock? */ 159 freebind : 1, 160 hdrincl : 1, 161 mc_loop : 1; 162 int mc_index; /* Multicast device index */ 163 __u32 mc_addr; 164 struct ip_mc_socklist *mc_list; /* Group array */ 165 /* 166 * Following members are used to retain the infomation to build 167 * an ip header on each ip fragmentation while the socket is corked. 168 */ 169 struct { 170 unsigned int flags; 171 unsigned int fragsize; 172 struct ip_options *opt; 173 struct rtable *rt; 174 int length; /* Total length of all frames */ 175 u32 addr; 176 struct flowi fl; 177 } cork; 178 }; 179 180 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */ 181 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */ 182 183 static inline struct inet_sock *inet_sk(const struct sock *sk) 184 { 185 return (struct inet_sock *)sk; 186 } 187 188 static inline void __inet_sk_copy_descendant(struct sock *sk_to, 189 const struct sock *sk_from, 190 const int ancestor_size) 191 { 192 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1, 193 sk_from->sk_prot->obj_size - ancestor_size); 194 } 195 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) 196 static inline void inet_sk_copy_descendant(struct sock *sk_to, 197 const struct sock *sk_from) 198 { 199 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock)); 200 } 201 #endif 202 #endif 203 204 extern int inet_sk_rebuild_header(struct sock *sk); 205 206 struct iphdr { 207 #if defined(__LITTLE_ENDIAN_BITFIELD) 208 __u8 ihl:4, 209 version:4; 210 #elif defined (__BIG_ENDIAN_BITFIELD) 211 __u8 version:4, 212 ihl:4; 213 #else 214 #error "Please fix <asm/byteorder.h>" 215 #endif 216 __u8 tos; 217 __u16 tot_len; 218 __u16 id; 219 __u16 frag_off; 220 __u8 ttl; 221 __u8 protocol; 222 __u16 check; 223 __u32 saddr; 224 __u32 daddr; 225 /*The options start here. */ 226 }; 227 228 struct ip_auth_hdr { 229 __u8 nexthdr; 230 __u8 hdrlen; /* This one is measured in 32 bit units! */ 231 __u16 reserved; 232 __u32 spi; 233 __u32 seq_no; /* Sequence number */ 234 __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */ 235 }; 236 237 struct ip_esp_hdr { 238 __u32 spi; 239 __u32 seq_no; /* Sequence number */ 240 __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */ 241 }; 242 243 struct ip_comp_hdr { 244 __u8 nexthdr; 245 __u8 flags; 246 __u16 cpi; 247 }; 248 249 #endif /* _LINUX_IP_H */ 250