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30 * @(#)ip.h 8.2 (Berkeley) 6/1/94
34 #ifndef _NETINET_IP_H_
35 #define _NETINET_IP_H_
37 #include <sys/cdefs.h>
40 * Definitions for internet protocol version 4.
42 * Per RFC 791, September 1981.
47 * Structure of an internet header, naked of options.
50 #if BYTE_ORDER == LITTLE_ENDIAN
51 u_char ip_hl:4, /* header length */
54 #if BYTE_ORDER == BIG_ENDIAN
55 u_char ip_v:4, /* version */
56 ip_hl:4; /* header length */
58 u_char ip_tos; /* type of service */
59 u_short ip_len; /* total length */
60 u_short ip_id; /* identification */
61 u_short ip_off; /* fragment offset field */
62 #define IP_RF 0x8000 /* reserved fragment flag */
63 #define IP_DF 0x4000 /* dont fragment flag */
64 #define IP_MF 0x2000 /* more fragments flag */
65 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
66 u_char ip_ttl; /* time to live */
67 u_char ip_p; /* protocol */
68 u_short ip_sum; /* checksum */
69 struct in_addr ip_src,ip_dst; /* source and dest address */
70 } __packed __aligned(4);
72 #define IP_MAXPACKET 65535 /* maximum packet size */
75 * Definitions for IP type of service (ip_tos).
77 #define IPTOS_LOWDELAY 0x10
78 #define IPTOS_THROUGHPUT 0x08
79 #define IPTOS_RELIABILITY 0x04
80 #define IPTOS_MINCOST 0x02
83 * Definitions for IP precedence (also in ip_tos) (hopefully unused).
85 #define IPTOS_PREC_NETCONTROL 0xe0
86 #define IPTOS_PREC_INTERNETCONTROL 0xc0
87 #define IPTOS_PREC_CRITIC_ECP 0xa0
88 #define IPTOS_PREC_FLASHOVERRIDE 0x80
89 #define IPTOS_PREC_FLASH 0x60
90 #define IPTOS_PREC_IMMEDIATE 0x40
91 #define IPTOS_PREC_PRIORITY 0x20
92 #define IPTOS_PREC_ROUTINE 0x00
95 * Definitions for DiffServ Codepoints as per RFC2474
97 #define IPTOS_DSCP_CS0 0x00
98 #define IPTOS_DSCP_CS1 0x20
99 #define IPTOS_DSCP_AF11 0x28
100 #define IPTOS_DSCP_AF12 0x30
101 #define IPTOS_DSCP_AF13 0x38
102 #define IPTOS_DSCP_CS2 0x40
103 #define IPTOS_DSCP_AF21 0x48
104 #define IPTOS_DSCP_AF22 0x50
105 #define IPTOS_DSCP_AF23 0x58
106 #define IPTOS_DSCP_CS3 0x60
107 #define IPTOS_DSCP_AF31 0x68
108 #define IPTOS_DSCP_AF32 0x70
109 #define IPTOS_DSCP_AF33 0x78
110 #define IPTOS_DSCP_CS4 0x80
111 #define IPTOS_DSCP_AF41 0x88
112 #define IPTOS_DSCP_AF42 0x90
113 #define IPTOS_DSCP_AF43 0x98
114 #define IPTOS_DSCP_CS5 0xa0
115 #define IPTOS_DSCP_EF 0xb8
116 #define IPTOS_DSCP_CS6 0xc0
117 #define IPTOS_DSCP_CS7 0xe0
120 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the
121 * lower 2 bits of the TOS field.
123 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
124 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
125 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
126 #define IPTOS_ECN_CE 0x03 /* congestion experienced */
127 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
130 * Definitions for options.
132 #define IPOPT_COPIED(o) ((o)&0x80)
133 #define IPOPT_CLASS(o) ((o)&0x60)
134 #define IPOPT_NUMBER(o) ((o)&0x1f)
136 #define IPOPT_CONTROL 0x00
137 #define IPOPT_RESERVED1 0x20
138 #define IPOPT_DEBMEAS 0x40
139 #define IPOPT_RESERVED2 0x60
141 #define IPOPT_EOL 0 /* end of option list */
142 #define IPOPT_NOP 1 /* no operation */
144 #define IPOPT_RR 7 /* record packet route */
145 #define IPOPT_TS 68 /* timestamp */
146 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
147 #define IPOPT_LSRR 131 /* loose source route */
148 #define IPOPT_ESO 133 /* extended security */
149 #define IPOPT_CIPSO 134 /* commerical security */
150 #define IPOPT_SATID 136 /* satnet id */
151 #define IPOPT_SSRR 137 /* strict source route */
152 #define IPOPT_RA 148 /* router alert */
155 * Offsets to fields in options other than EOL and NOP.
157 #define IPOPT_OPTVAL 0 /* option ID */
158 #define IPOPT_OLEN 1 /* option length */
159 #define IPOPT_OFFSET 2 /* offset within option */
160 #define IPOPT_MINOFF 4 /* min value of above */
163 * Time stamp option structure.
165 struct ip_timestamp {
166 u_char ipt_code; /* IPOPT_TS */
167 u_char ipt_len; /* size of structure (variable) */
168 u_char ipt_ptr; /* index of current entry */
169 #if BYTE_ORDER == LITTLE_ENDIAN
170 u_char ipt_flg:4, /* flags, see below */
171 ipt_oflw:4; /* overflow counter */
173 #if BYTE_ORDER == BIG_ENDIAN
174 u_char ipt_oflw:4, /* overflow counter */
175 ipt_flg:4; /* flags, see below */
177 union ipt_timestamp {
178 uint32_t ipt_time[1]; /* network format */
180 struct in_addr ipt_addr;
181 uint32_t ipt_time; /* network format */
186 /* Flag bits for ipt_flg. */
187 #define IPOPT_TS_TSONLY 0 /* timestamps only */
188 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
189 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
191 /* Bits for security (not byte swapped). */
192 #define IPOPT_SECUR_UNCLASS 0x0000
193 #define IPOPT_SECUR_CONFID 0xf135
194 #define IPOPT_SECUR_EFTO 0x789a
195 #define IPOPT_SECUR_MMMM 0xbc4d
196 #define IPOPT_SECUR_RESTR 0xaf13
197 #define IPOPT_SECUR_SECRET 0xd788
198 #define IPOPT_SECUR_TOPSECRET 0x6bc5
201 * Internet implementation parameters.
203 #define MAXTTL 255 /* maximum time to live (seconds) */
204 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
205 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
206 #define IPTTLDEC 1 /* subtracted when forwarding */
207 #define IP_MSS 576 /* default maximum segment size */
210 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
211 * checksums. For the Internet checksum, struct ipovly can be used instead.
212 * For stronger checksums, the real thing must be used.
215 struct in_addr ippseudo_src; /* source internet address */
216 struct in_addr ippseudo_dst; /* destination internet address */
217 u_char ippseudo_pad; /* pad, must be zero */
218 u_char ippseudo_p; /* protocol */
219 u_short ippseudo_len; /* protocol length */