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1.1 root 1: /*
2: * Copyright (c) 1982, 1986, 1993
3: * The Regents of the University of California. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
1.1.1.4 root 13: * 3. Neither the name of the University nor the names of its contributors
1.1 root 14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: *
29: * @(#)ip.h 8.1 (Berkeley) 6/10/93
30: * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
31: */
32:
33: #ifndef _IP_H_
34: #define _IP_H_
35:
1.1.1.6 root 36: #ifdef HOST_WORDS_BIGENDIAN
1.1.1.9 ! root 37: # undef NTOHL
! 38: # undef NTOHS
! 39: # undef HTONL
! 40: # undef HTONS
! 41: # define NTOHL(d)
! 42: # define NTOHS(d)
! 43: # define HTONL(d)
! 44: # define HTONS(d)
1.1 root 45: #else
46: # ifndef NTOHL
47: # define NTOHL(d) ((d) = ntohl((d)))
48: # endif
49: # ifndef NTOHS
1.1.1.7 root 50: # define NTOHS(d) ((d) = ntohs((uint16_t)(d)))
1.1 root 51: # endif
52: # ifndef HTONL
53: # define HTONL(d) ((d) = htonl((d)))
54: # endif
55: # ifndef HTONS
1.1.1.7 root 56: # define HTONS(d) ((d) = htons((uint16_t)(d)))
1.1 root 57: # endif
58: #endif
59:
1.1.1.7 root 60: typedef uint32_t n_long; /* long as received from the net */
1.1 root 61:
62: /*
63: * Definitions for internet protocol version 4.
64: * Per RFC 791, September 1981.
65: */
66: #define IPVERSION 4
67:
68: /*
69: * Structure of an internet header, naked of options.
70: */
71: struct ip {
1.1.1.6 root 72: #ifdef HOST_WORDS_BIGENDIAN
1.1.1.8 root 73: uint8_t ip_v:4, /* version */
1.1 root 74: ip_hl:4; /* header length */
75: #else
1.1.1.8 root 76: uint8_t ip_hl:4, /* header length */
1.1 root 77: ip_v:4; /* version */
78: #endif
1.1.1.7 root 79: uint8_t ip_tos; /* type of service */
80: uint16_t ip_len; /* total length */
81: uint16_t ip_id; /* identification */
82: uint16_t ip_off; /* fragment offset field */
1.1 root 83: #define IP_DF 0x4000 /* don't fragment flag */
84: #define IP_MF 0x2000 /* more fragments flag */
85: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
1.1.1.7 root 86: uint8_t ip_ttl; /* time to live */
87: uint8_t ip_p; /* protocol */
88: uint16_t ip_sum; /* checksum */
1.1 root 89: struct in_addr ip_src,ip_dst; /* source and dest address */
1.1.1.8 root 90: } QEMU_PACKED;
1.1 root 91:
92: #define IP_MAXPACKET 65535 /* maximum packet size */
93:
94: /*
95: * Definitions for IP type of service (ip_tos)
96: */
97: #define IPTOS_LOWDELAY 0x10
98: #define IPTOS_THROUGHPUT 0x08
99: #define IPTOS_RELIABILITY 0x04
100:
101: /*
102: * Definitions for options.
103: */
104: #define IPOPT_COPIED(o) ((o)&0x80)
105: #define IPOPT_CLASS(o) ((o)&0x60)
106: #define IPOPT_NUMBER(o) ((o)&0x1f)
107:
108: #define IPOPT_CONTROL 0x00
109: #define IPOPT_RESERVED1 0x20
110: #define IPOPT_DEBMEAS 0x40
111: #define IPOPT_RESERVED2 0x60
112:
113: #define IPOPT_EOL 0 /* end of option list */
114: #define IPOPT_NOP 1 /* no operation */
115:
116: #define IPOPT_RR 7 /* record packet route */
117: #define IPOPT_TS 68 /* timestamp */
118: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
119: #define IPOPT_LSRR 131 /* loose source route */
120: #define IPOPT_SATID 136 /* satnet id */
121: #define IPOPT_SSRR 137 /* strict source route */
122:
123: /*
124: * Offsets to fields in options other than EOL and NOP.
125: */
126: #define IPOPT_OPTVAL 0 /* option ID */
127: #define IPOPT_OLEN 1 /* option length */
128: #define IPOPT_OFFSET 2 /* offset within option */
129: #define IPOPT_MINOFF 4 /* min value of above */
130:
131: /*
132: * Time stamp option structure.
133: */
134: struct ip_timestamp {
1.1.1.7 root 135: uint8_t ipt_code; /* IPOPT_TS */
136: uint8_t ipt_len; /* size of structure (variable) */
137: uint8_t ipt_ptr; /* index of current entry */
1.1.1.6 root 138: #ifdef HOST_WORDS_BIGENDIAN
1.1.1.8 root 139: uint8_t ipt_oflw:4, /* overflow counter */
1.1 root 140: ipt_flg:4; /* flags, see below */
141: #else
1.1.1.8 root 142: uint8_t ipt_flg:4, /* flags, see below */
1.1 root 143: ipt_oflw:4; /* overflow counter */
144: #endif
145: union ipt_timestamp {
146: n_long ipt_time[1];
147: struct ipt_ta {
148: struct in_addr ipt_addr;
149: n_long ipt_time;
150: } ipt_ta[1];
151: } ipt_timestamp;
1.1.1.8 root 152: } QEMU_PACKED;
1.1 root 153:
154: /* flag bits for ipt_flg */
155: #define IPOPT_TS_TSONLY 0 /* timestamps only */
156: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
157: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
158:
159: /* bits for security (not byte swapped) */
160: #define IPOPT_SECUR_UNCLASS 0x0000
161: #define IPOPT_SECUR_CONFID 0xf135
162: #define IPOPT_SECUR_EFTO 0x789a
163: #define IPOPT_SECUR_MMMM 0xbc4d
164: #define IPOPT_SECUR_RESTR 0xaf13
165: #define IPOPT_SECUR_SECRET 0xd788
166: #define IPOPT_SECUR_TOPSECRET 0x6bc5
167:
168: /*
169: * Internet implementation parameters.
170: */
171: #define MAXTTL 255 /* maximum time to live (seconds) */
172: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
173: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
174: #define IPTTLDEC 1 /* subtracted when forwarding */
175:
176: #define IP_MSS 576 /* default maximum segment size */
177:
178: #if SIZEOF_CHAR_P == 4
1.1.1.4 root 179: struct mbuf_ptr {
180: struct mbuf *mptr;
181: uint32_t dummy;
1.1.1.8 root 182: } QEMU_PACKED;
1.1 root 183: #else
1.1.1.4 root 184: struct mbuf_ptr {
185: struct mbuf *mptr;
1.1.1.8 root 186: } QEMU_PACKED;
1.1 root 187: #endif
1.1.1.4 root 188: struct qlink {
189: void *next, *prev;
190: };
1.1 root 191:
192: /*
193: * Overlay for ip header used by other protocols (tcp, udp).
194: */
195: struct ipovly {
1.1.1.4 root 196: struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */
1.1.1.7 root 197: uint8_t ih_x1; /* (unused) */
198: uint8_t ih_pr; /* protocol */
199: uint16_t ih_len; /* protocol length */
1.1 root 200: struct in_addr ih_src; /* source internet address */
201: struct in_addr ih_dst; /* destination internet address */
1.1.1.8 root 202: } QEMU_PACKED;
1.1 root 203:
204: /*
205: * Ip reassembly queue structure. Each fragment
206: * being reassembled is attached to one of these structures.
207: * They are timed out after ipq_ttl drops to 0, and may also
208: * be reclaimed if memory becomes tight.
209: * size 28 bytes
210: */
211: struct ipq {
1.1.1.4 root 212: struct qlink frag_link; /* to ip headers of fragments */
213: struct qlink ip_link; /* to other reass headers */
1.1.1.7 root 214: uint8_t ipq_ttl; /* time for reass q to live */
215: uint8_t ipq_p; /* protocol of this fragment */
216: uint16_t ipq_id; /* sequence id for reassembly */
1.1 root 217: struct in_addr ipq_src,ipq_dst;
1.1.1.8 root 218: } QEMU_PACKED;
1.1 root 219:
220: /*
221: * Ip header, when holding a fragment.
222: *
1.1.1.4 root 223: * Note: ipf_link must be at same offset as frag_link above
1.1 root 224: */
225: struct ipasfrag {
1.1.1.4 root 226: struct qlink ipf_link;
227: struct ip ipf_ip;
1.1.1.8 root 228: } QEMU_PACKED;
1.1 root 229:
1.1.1.4 root 230: #define ipf_off ipf_ip.ip_off
231: #define ipf_tos ipf_ip.ip_tos
232: #define ipf_len ipf_ip.ip_len
233: #define ipf_next ipf_link.next
1.1.1.7 root 234: #define ipf_prev ipf_link.prev
1.1.1.4 root 235:
1.1 root 236: /*
237: * Structure stored in mbuf in inpcb.ip_options
238: * and passed to ip_output when ip options are in use.
239: * The actual length of the options (including ipopt_dst)
240: * is in m_len.
241: */
242: #define MAX_IPOPTLEN 40
243:
244: struct ipoption {
245: struct in_addr ipopt_dst; /* first-hop dst if source routed */
246: int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
1.1.1.8 root 247: } QEMU_PACKED;
1.1 root 248:
249: #endif
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