include/linux/ip.h

   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 */