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29 * @(#)ip.h 8.2 (Berkeley) 6/1/94
33 #ifndef _NETINET_IP_H_
34 #define _NETINET_IP_H_
36 #include <sys/cdefs.h>
39 * Definitions for internet protocol version 4.
40 * Per RFC 791, September 1981.
45 * Structure of an internet header, naked of options.
48 #if BYTE_ORDER == LITTLE_ENDIAN
49 u_int ip_hl:4, /* header length */
52 #if BYTE_ORDER == BIG_ENDIAN
53 u_int ip_v:4, /* version */
54 ip_hl:4; /* header length */
56 u_char ip_tos; /* type of service */
57 u_short ip_len; /* total length */
58 u_short ip_id; /* identification */
59 u_short ip_off; /* fragment offset field */
60 #define IP_RF 0x8000 /* reserved fragment flag */
61 #define IP_DF 0x4000 /* dont fragment flag */
62 #define IP_MF 0x2000 /* more fragments flag */
63 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
64 u_char ip_ttl; /* time to live */
65 u_char ip_p; /* protocol */
66 u_short ip_sum; /* checksum */
67 struct in_addr ip_src,ip_dst; /* source and dest address */
68 } __packed __aligned(4);
71 CTASSERT(sizeof (struct ip) == 20);
74 #define IP_MAXPACKET 65535 /* maximum packet size */
77 * Definitions for IP type of service (ip_tos)
79 #define IPTOS_LOWDELAY 0x10
80 #define IPTOS_THROUGHPUT 0x08
81 #define IPTOS_RELIABILITY 0x04
82 #define IPTOS_MINCOST 0x02
84 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
86 #define IPTOS_ECT 0x02
90 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
92 #define IPTOS_PREC_NETCONTROL 0xe0
93 #define IPTOS_PREC_INTERNETCONTROL 0xc0
94 #define IPTOS_PREC_CRITIC_ECP 0xa0
95 #define IPTOS_PREC_FLASHOVERRIDE 0x80
96 #define IPTOS_PREC_FLASH 0x60
97 #define IPTOS_PREC_IMMEDIATE 0x40
98 #define IPTOS_PREC_PRIORITY 0x20
99 #define IPTOS_PREC_ROUTINE 0x00
102 * ECN (Explicit Congestion Notification) codepoints in RFC3168
103 * mapped to the lower 2 bits of the TOS field.
105 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
106 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
107 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
108 #define IPTOS_ECN_CE 0x03 /* congestion experienced */
109 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
112 * Definitions for options.
114 #define IPOPT_COPIED(o) ((o)&0x80)
115 #define IPOPT_CLASS(o) ((o)&0x60)
116 #define IPOPT_NUMBER(o) ((o)&0x1f)
118 #define IPOPT_CONTROL 0x00
119 #define IPOPT_RESERVED1 0x20
120 #define IPOPT_DEBMEAS 0x40
121 #define IPOPT_RESERVED2 0x60
123 #define IPOPT_EOL 0 /* end of option list */
124 #define IPOPT_NOP 1 /* no operation */
126 #define IPOPT_RR 7 /* record packet route */
127 #define IPOPT_TS 68 /* timestamp */
128 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
129 #define IPOPT_LSRR 131 /* loose source route */
130 #define IPOPT_ESO 133 /* extended security */
131 #define IPOPT_CIPSO 134 /* commerical security */
132 #define IPOPT_SATID 136 /* satnet id */
133 #define IPOPT_SSRR 137 /* strict source route */
134 #define IPOPT_RA 148 /* router alert */
137 * Offsets to fields in options other than EOL and NOP.
139 #define IPOPT_OPTVAL 0 /* option ID */
140 #define IPOPT_OLEN 1 /* option length */
141 #define IPOPT_OFFSET 2 /* offset within option */
142 #define IPOPT_MINOFF 4 /* min value of above */
145 * Time stamp option structure.
147 struct ip_timestamp {
148 u_char ipt_code; /* IPOPT_TS */
149 u_char ipt_len; /* size of structure (variable) */
150 u_char ipt_ptr; /* index of current entry */
151 #if BYTE_ORDER == LITTLE_ENDIAN
152 u_int ipt_flg:4, /* flags, see below */
153 ipt_oflw:4; /* overflow counter */
155 #if BYTE_ORDER == BIG_ENDIAN
156 u_int ipt_oflw:4, /* overflow counter */
157 ipt_flg:4; /* flags, see below */
159 union ipt_timestamp {
162 struct in_addr ipt_addr;
168 /* flag bits for ipt_flg */
169 #define IPOPT_TS_TSONLY 0 /* timestamps only */
170 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
171 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
173 /* bits for security (not byte swapped) */
174 #define IPOPT_SECUR_UNCLASS 0x0000
175 #define IPOPT_SECUR_CONFID 0xf135
176 #define IPOPT_SECUR_EFTO 0x789a
177 #define IPOPT_SECUR_MMMM 0xbc4d
178 #define IPOPT_SECUR_RESTR 0xaf13
179 #define IPOPT_SECUR_SECRET 0xd788
180 #define IPOPT_SECUR_TOPSECRET 0x6bc5
183 * Internet implementation parameters.
185 #define MAXTTL 255 /* maximum time to live (seconds) */
186 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
187 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
188 #define IPTTLDEC 1 /* subtracted when forwarding */
190 #define IP_MSS 576 /* default maximum segment size */
193 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
194 * checksums. For the Internet checksum, struct ipovly can be used instead.
195 * For stronger checksums, the real thing must be used.
198 struct in_addr ippseudo_src; /* source internet address */
199 struct in_addr ippseudo_dst; /* destination internet address */
200 u_char ippseudo_pad; /* pad, must be zero */
201 u_char ippseudo_p; /* protocol */
202 u_short ippseudo_len; /* protocol length */