126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
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/* netinet/ip.h
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* definitions for ipv4 protocol
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*/
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#ifndef _NETINET_IP_H
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#define _NETINET_IP_H
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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/* Based on RFC 791 */
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#define IPVERSION 4
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struct ip {
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#if BYTE_ORDER == BIG_ENDIAN
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uint8 ip_v:4;
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uint8 ip_hl:4;
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#elif BYTE_ORDER == LITTLE_ENDIAN
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uint8 ip_hl:4;
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uint8 ip_v:4;
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#endif
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uint8 ip_tos;
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uint16 ip_len;
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uint16 ip_id;
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int16 ip_off;
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uint8 ip_ttl;
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uint8 ip_p;
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uint16 ip_sum;
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struct in_addr ip_src;
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struct in_addr ip_dst;
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} _PACKED;
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#define IP_MAXPACKET 65535/* Maximum packet size */
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/* IP Type of Service */
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#define IPTOS_RELIABILITY 0x04
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#define IPTOS_THROUGHPUT 0x08
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#define IPTOS_LOWDELAY 0x10
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/*
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* Definitions for options.
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*/
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#define IPOPT_COPIED(o)((o)&0x80)
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#define IPOPT_CLASS(o)((o)&0x60)
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#define IPOPT_NUMBER(o)((o)&0x1f)
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#define IPOPT_CONTROL 0x00
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#define IPOPT_RESERVED1 0x20
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#define IPOPT_DEBMEAS 0x40
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#define IPOPT_RESERVED2 0x60
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#define IPOPT_EOL 0/* end of option list */
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#define IPOPT_NOP 1/* no operation */
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#define IPOPT_RR 7/* record packet route */
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#define IPOPT_TS 68/* timestamp */
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#define IPOPT_SECURITY 130/* provide s,c,h,tcc */
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#define IPOPT_LSRR 131/* loose source route */
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#define IPOPT_SATID 136/* satnet id */
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#define IPOPT_SSRR 137/* strict source route */
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/*
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* Offsets to fields in options other than EOL and NOP.
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*/
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#define IPOPT_OPTVAL 0/* option ID */
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#define IPOPT_OLEN 1/* option length */
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#define IPOPT_OFFSET 2/* offset within option */
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#define IPOPT_MINOFF 4/* min value of above */
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struct ip_timestamp {
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uint8 ipt_code;/* IPOPT_TS */
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uint8 ipt_len;/* size of structure (variable) */
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uint8 ipt_ptr;/* index of current entry */
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#if BYTE_ORDER == BIG_ENDIAN
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uint8 ipt_oflw:4,
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ipt_flg:4;
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#elif BYTE_ORDER == LITTLE_ENDIAN
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uint8 ipt_flg:4,
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ipt_oflw:4;
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#endif
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union ipt_timestamp {
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n_time ipt_time[1];
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struct ipt_ta {
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struct in_addr ipt_addr;
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n_time ipt_time;
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} ipt_ta;
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} ipt_timestamp;
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};
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/* flag bits for ipt_flg */
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#define IPOPT_TS_TSONLY 0/* timestamps only */
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#define IPOPT_TS_TSANDADDR 1/* timestamps and addresses */
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#define IPOPT_TS_PRESPEC 3/* specified modules only */
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/* bits for security (not byte swapped) */
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#define IPOPT_SECUR_UNCLASS 0x0000
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#define IPOPT_SECUR_CONFID 0xf135
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#define IPOPT_SECUR_EFTO 0x789a
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#define IPOPT_SECUR_MMMM 0xbc4d
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#define IPOPT_SECUR_RESTR 0xaf13
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#define IPOPT_SECUR_SECRET 0xd788
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#define IPOPT_SECUR_TOPSECRET 0x6bc5
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#define MAXTTL 255/* maximum time to live (seconds) */
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#define IPDEFTTL 64/* default ttl, from RFC 1340 */
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#define IPFRAGTTL 60/* time to live for frags, slowhz */
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#define IPTTLDEC 1/* subtracted when forwarding */
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#define IP_MSS 576/* default maximum segment size */
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struct ippseudo {
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struct in_addr ippseudo_src; /* source internet address */
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struct in_addr ippseudo_dst; /* destination internet address */
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uint8 ippseudo_pad;/* pad, must be zero */
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uint8 ippseudo_p;/* protocol */
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uint16 ippseudo_len;/* protocol length */
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};
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/* Fragment flags */
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#define IP_DF 0x4000 /* don't fragment */
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#define IP_MF 0x2000 /* more fragments */
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#define IP_OFFMASK 0x1fff
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#endif /* NETINET_IP_H */
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