Annotation of qemu/slirp/ip.h, revision 1.1.1.6
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 root 37: # ifndef NTOHL
38: # define NTOHL(d)
39: # endif
40: # ifndef NTOHS
41: # define NTOHS(d)
42: # endif
43: # ifndef HTONL
44: # define HTONL(d)
45: # endif
46: # ifndef HTONS
47: # define HTONS(d)
48: # endif
49: #else
50: # ifndef NTOHL
51: # define NTOHL(d) ((d) = ntohl((d)))
52: # endif
53: # ifndef NTOHS
54: # define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
55: # endif
56: # ifndef HTONL
57: # define HTONL(d) ((d) = htonl((d)))
58: # endif
59: # ifndef HTONS
60: # define HTONS(d) ((d) = htons((u_int16_t)(d)))
61: # endif
62: #endif
63:
64: typedef u_int32_t n_long; /* long as received from the net */
65:
66: /*
67: * Definitions for internet protocol version 4.
68: * Per RFC 791, September 1981.
69: */
70: #define IPVERSION 4
71:
72: /*
73: * Structure of an internet header, naked of options.
74: */
75: struct ip {
1.1.1.6 ! root 76: #ifdef HOST_WORDS_BIGENDIAN
1.1 root 77: u_int ip_v:4, /* version */
78: ip_hl:4; /* header length */
79: #else
80: u_int ip_hl:4, /* header length */
81: ip_v:4; /* version */
82: #endif
83: u_int8_t ip_tos; /* type of service */
1.1.1.2 root 84: u_int16_t ip_len; /* total length */
1.1 root 85: u_int16_t ip_id; /* identification */
1.1.1.2 root 86: u_int16_t ip_off; /* fragment offset field */
1.1 root 87: #define IP_DF 0x4000 /* don't fragment flag */
88: #define IP_MF 0x2000 /* more fragments flag */
89: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
90: u_int8_t ip_ttl; /* time to live */
91: u_int8_t ip_p; /* protocol */
92: u_int16_t ip_sum; /* checksum */
93: struct in_addr ip_src,ip_dst; /* source and dest address */
94: };
95:
96: #define IP_MAXPACKET 65535 /* maximum packet size */
97:
98: /*
99: * Definitions for IP type of service (ip_tos)
100: */
101: #define IPTOS_LOWDELAY 0x10
102: #define IPTOS_THROUGHPUT 0x08
103: #define IPTOS_RELIABILITY 0x04
104:
105: /*
106: * Definitions for options.
107: */
108: #define IPOPT_COPIED(o) ((o)&0x80)
109: #define IPOPT_CLASS(o) ((o)&0x60)
110: #define IPOPT_NUMBER(o) ((o)&0x1f)
111:
112: #define IPOPT_CONTROL 0x00
113: #define IPOPT_RESERVED1 0x20
114: #define IPOPT_DEBMEAS 0x40
115: #define IPOPT_RESERVED2 0x60
116:
117: #define IPOPT_EOL 0 /* end of option list */
118: #define IPOPT_NOP 1 /* no operation */
119:
120: #define IPOPT_RR 7 /* record packet route */
121: #define IPOPT_TS 68 /* timestamp */
122: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
123: #define IPOPT_LSRR 131 /* loose source route */
124: #define IPOPT_SATID 136 /* satnet id */
125: #define IPOPT_SSRR 137 /* strict source route */
126:
127: /*
128: * Offsets to fields in options other than EOL and NOP.
129: */
130: #define IPOPT_OPTVAL 0 /* option ID */
131: #define IPOPT_OLEN 1 /* option length */
132: #define IPOPT_OFFSET 2 /* offset within option */
133: #define IPOPT_MINOFF 4 /* min value of above */
134:
135: /*
136: * Time stamp option structure.
137: */
138: struct ip_timestamp {
139: u_int8_t ipt_code; /* IPOPT_TS */
140: u_int8_t ipt_len; /* size of structure (variable) */
141: u_int8_t ipt_ptr; /* index of current entry */
1.1.1.6 ! root 142: #ifdef HOST_WORDS_BIGENDIAN
1.1 root 143: u_int ipt_oflw:4, /* overflow counter */
144: ipt_flg:4; /* flags, see below */
145: #else
146: u_int ipt_flg:4, /* flags, see below */
147: ipt_oflw:4; /* overflow counter */
148: #endif
149: union ipt_timestamp {
150: n_long ipt_time[1];
151: struct ipt_ta {
152: struct in_addr ipt_addr;
153: n_long ipt_time;
154: } ipt_ta[1];
155: } ipt_timestamp;
156: };
157:
158: /* flag bits for ipt_flg */
159: #define IPOPT_TS_TSONLY 0 /* timestamps only */
160: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
161: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
162:
163: /* bits for security (not byte swapped) */
164: #define IPOPT_SECUR_UNCLASS 0x0000
165: #define IPOPT_SECUR_CONFID 0xf135
166: #define IPOPT_SECUR_EFTO 0x789a
167: #define IPOPT_SECUR_MMMM 0xbc4d
168: #define IPOPT_SECUR_RESTR 0xaf13
169: #define IPOPT_SECUR_SECRET 0xd788
170: #define IPOPT_SECUR_TOPSECRET 0x6bc5
171:
172: /*
173: * Internet implementation parameters.
174: */
175: #define MAXTTL 255 /* maximum time to live (seconds) */
176: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
177: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
178: #define IPTTLDEC 1 /* subtracted when forwarding */
179:
180: #define IP_MSS 576 /* default maximum segment size */
181:
182: #if SIZEOF_CHAR_P == 4
1.1.1.4 root 183: struct mbuf_ptr {
184: struct mbuf *mptr;
185: uint32_t dummy;
186: };
1.1 root 187: #else
1.1.1.4 root 188: struct mbuf_ptr {
189: struct mbuf *mptr;
190: };
1.1 root 191: #endif
1.1.1.4 root 192: struct qlink {
193: void *next, *prev;
194: };
1.1 root 195:
196: /*
197: * Overlay for ip header used by other protocols (tcp, udp).
198: */
199: struct ipovly {
1.1.1.4 root 200: struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */
1.1 root 201: u_int8_t ih_x1; /* (unused) */
202: u_int8_t ih_pr; /* protocol */
1.1.1.2 root 203: u_int16_t ih_len; /* protocol length */
1.1 root 204: struct in_addr ih_src; /* source internet address */
205: struct in_addr ih_dst; /* destination internet address */
1.1.1.4 root 206: } __attribute__((packed));
1.1 root 207:
208: /*
209: * Ip reassembly queue structure. Each fragment
210: * being reassembled is attached to one of these structures.
211: * They are timed out after ipq_ttl drops to 0, and may also
212: * be reclaimed if memory becomes tight.
213: * size 28 bytes
214: */
215: struct ipq {
1.1.1.4 root 216: struct qlink frag_link; /* to ip headers of fragments */
217: struct qlink ip_link; /* to other reass headers */
1.1 root 218: u_int8_t ipq_ttl; /* time for reass q to live */
219: u_int8_t ipq_p; /* protocol of this fragment */
220: u_int16_t ipq_id; /* sequence id for reassembly */
221: struct in_addr ipq_src,ipq_dst;
222: };
223:
224: /*
225: * Ip header, when holding a fragment.
226: *
1.1.1.4 root 227: * Note: ipf_link must be at same offset as frag_link above
1.1 root 228: */
229: struct ipasfrag {
1.1.1.4 root 230: struct qlink ipf_link;
231: struct ip ipf_ip;
1.1 root 232: };
233:
1.1.1.4 root 234: #define ipf_off ipf_ip.ip_off
235: #define ipf_tos ipf_ip.ip_tos
236: #define ipf_len ipf_ip.ip_len
237: #define ipf_next ipf_link.next
238: #define ipf_prev ipf_link.prev
239:
1.1 root 240: /*
241: * Structure stored in mbuf in inpcb.ip_options
242: * and passed to ip_output when ip options are in use.
243: * The actual length of the options (including ipopt_dst)
244: * is in m_len.
245: */
246: #define MAX_IPOPTLEN 40
247:
248: struct ipoption {
249: struct in_addr ipopt_dst; /* first-hop dst if source routed */
250: int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
251: };
252:
253: #endif
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