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TOMOYO Linux Cross Reference
Linux/include/linux/ip.h

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  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/sock.h>
 85 #include <linux/igmp.h>
 86 #include <net/flow.h>
 87 
 88 struct ip_options {
 89   __u32         faddr;                          /* Saved first hop address */
 90   unsigned char optlen;
 91   unsigned char srr;
 92   unsigned char rr;
 93   unsigned char ts;
 94   unsigned char is_setbyuser:1,                 /* Set by setsockopt?                   */
 95                 is_data:1,                      /* Options in __data, rather than skb   */
 96                 is_strictroute:1,               /* Strict source route                  */
 97                 srr_is_hit:1,                   /* Packet destination addr was our one  */
 98                 is_changed:1,                   /* IP checksum more not valid           */      
 99                 rr_needaddr:1,                  /* Need to record addr of outgoing dev  */
100                 ts_needtime:1,                  /* Need to record timestamp             */
101                 ts_needaddr:1;                  /* Need to record addr of outgoing dev  */
102   unsigned char router_alert;
103   unsigned char __pad1;
104   unsigned char __pad2;
105   unsigned char __data[0];
106 };
107 
108 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
109 
110 struct inet_opt {
111         /* Socket demultiplex comparisons on incoming packets. */
112         __u32                   daddr;          /* Foreign IPv4 addr */
113         __u32                   rcv_saddr;      /* Bound local IPv4 addr */
114         __u16                   dport;          /* Destination port */
115         __u16                   num;            /* Local port */
116         __u32                   saddr;          /* Sending source */
117         int                     uc_ttl;         /* Unicast TTL */
118         int                     tos;            /* TOS */
119         unsigned                cmsg_flags;
120         struct ip_options       *opt;
121         __u16                   sport;          /* Source port */
122         unsigned char           hdrincl;        /* Include headers ? */
123         __u8                    mc_ttl;         /* Multicasting TTL */
124         __u8                    mc_loop;        /* Loopback */
125         __u8                    pmtudisc;
126         __u16                   id;             /* ID counter for DF pkts */
127         unsigned                recverr : 1,
128                                 freebind : 1;
129         int                     mc_index;       /* Multicast device index */
130         __u32                   mc_addr;
131         struct ip_mc_socklist   *mc_list;       /* Group array */
132         struct page             *sndmsg_page;   /* Cached page for sendmsg */
133         u32                     sndmsg_off;     /* Cached offset for sendmsg */
134         /*
135          * Following members are used to retain the infomation to build
136          * an ip header on each ip fragmentation while the socket is corked.
137          */
138         struct {
139                 unsigned int            flags;
140                 unsigned int            fragsize;
141                 struct ip_options       *opt;
142                 struct rtable           *rt;
143                 int                     length; /* Total length of all frames */
144                 u32                     addr;
145                 struct flowi            fl;
146         } cork;
147 };
148 
149 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
150 
151 struct ipv6_pinfo;
152 
153 /* WARNING: don't change the layout of the members in inet_sock! */
154 struct inet_sock {
155         struct sock       sk;
156 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
157         struct ipv6_pinfo *pinet6;
158 #endif
159         struct inet_opt   inet;
160 };
161 
162 #define inet_sk(__sk) (&((struct inet_sock *)__sk)->inet)
163 
164 #endif
165 
166 struct iphdr {
167 #if defined(__LITTLE_ENDIAN_BITFIELD)
168         __u8    ihl:4,
169                 version:4;
170 #elif defined (__BIG_ENDIAN_BITFIELD)
171         __u8    version:4,
172                 ihl:4;
173 #else
174 #error  "Please fix <asm/byteorder.h>"
175 #endif
176         __u8    tos;
177         __u16   tot_len;
178         __u16   id;
179         __u16   frag_off;
180         __u8    ttl;
181         __u8    protocol;
182         __u16   check;
183         __u32   saddr;
184         __u32   daddr;
185         /*The options start here. */
186 };
187 
188 struct ip_auth_hdr {
189         __u8  nexthdr;
190         __u8  hdrlen;           /* This one is measured in 32 bit units! */
191         __u16 reserved;
192         __u32 spi;
193         __u32 seq_no;           /* Sequence number */
194         __u8  auth_data[0];     /* Variable len but >=4. Mind the 64 bit alignment! */
195 };
196 
197 struct ip_esp_hdr {
198         __u32 spi;
199         __u32 seq_no;           /* Sequence number */
200         __u8  enc_data[0];      /* Variable len but >=8. Mind the 64 bit alignment! */
201 };
202 
203 struct ip_comp_hdr {
204         __u8 nexthdr;
205         __u8 flags;
206         __u16 cpi;
207 };
208 
209 #endif  /* _LINUX_IP_H */
210 

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