bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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. |
aliguori | 2f5f899 | 2009-01-26 19:37:41 +0000 | [diff] [blame] | 13 | * 3. Neither the name of the University nor the names of its contributors |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 | |
Juan Quintela | e2542fe | 2009-07-27 16:13:06 +0200 | [diff] [blame] | 36 | #ifdef HOST_WORDS_BIGENDIAN |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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. |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 74 | */ |
| 75 | struct ip { |
Juan Quintela | e2542fe | 2009-07-27 16:13:06 +0200 | [diff] [blame] | 76 | #ifdef HOST_WORDS_BIGENDIAN |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 */ |
bellard | e553272 | 2006-05-02 21:09:02 +0000 | [diff] [blame] | 84 | u_int16_t ip_len; /* total length */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 85 | u_int16_t ip_id; /* identification */ |
bellard | e553272 | 2006-05-02 21:09:02 +0000 | [diff] [blame] | 86 | u_int16_t ip_off; /* fragment offset field */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 */ |
Juha Riihimäki | 9a0c6a3 | 2009-12-03 15:56:04 +0200 | [diff] [blame] | 94 | } __attribute__((packed)); |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 */ |
Juan Quintela | e2542fe | 2009-07-27 16:13:06 +0200 | [diff] [blame] | 142 | #ifdef HOST_WORDS_BIGENDIAN |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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; |
Juha Riihimäki | 9a0c6a3 | 2009-12-03 15:56:04 +0200 | [diff] [blame] | 156 | } __attribute__((packed)); |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 | |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 182 | #if SIZEOF_CHAR_P == 4 |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 183 | struct mbuf_ptr { |
| 184 | struct mbuf *mptr; |
| 185 | uint32_t dummy; |
Juha Riihimäki | 9a0c6a3 | 2009-12-03 15:56:04 +0200 | [diff] [blame] | 186 | } __attribute__((packed)); |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 187 | #else |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 188 | struct mbuf_ptr { |
| 189 | struct mbuf *mptr; |
Juha Riihimäki | 9a0c6a3 | 2009-12-03 15:56:04 +0200 | [diff] [blame] | 190 | } __attribute__((packed)); |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 191 | #endif |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 192 | struct qlink { |
| 193 | void *next, *prev; |
| 194 | }; |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 195 | |
| 196 | /* |
| 197 | * Overlay for ip header used by other protocols (tcp, udp). |
| 198 | */ |
| 199 | struct ipovly { |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 200 | struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 201 | u_int8_t ih_x1; /* (unused) */ |
| 202 | u_int8_t ih_pr; /* protocol */ |
bellard | e553272 | 2006-05-02 21:09:02 +0000 | [diff] [blame] | 203 | u_int16_t ih_len; /* protocol length */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 204 | struct in_addr ih_src; /* source internet address */ |
| 205 | struct in_addr ih_dst; /* destination internet address */ |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 206 | } __attribute__((packed)); |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 { |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 216 | struct qlink frag_link; /* to ip headers of fragments */ |
| 217 | struct qlink ip_link; /* to other reass headers */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 221 | struct in_addr ipq_src,ipq_dst; |
Juha Riihimäki | 9a0c6a3 | 2009-12-03 15:56:04 +0200 | [diff] [blame] | 222 | } __attribute__((packed)); |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 223 | |
| 224 | /* |
| 225 | * Ip header, when holding a fragment. |
| 226 | * |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 227 | * Note: ipf_link must be at same offset as frag_link above |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 228 | */ |
| 229 | struct ipasfrag { |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 230 | struct qlink ipf_link; |
| 231 | struct ip ipf_ip; |
Juha Riihimäki | 9a0c6a3 | 2009-12-03 15:56:04 +0200 | [diff] [blame] | 232 | } __attribute__((packed)); |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 233 | |
blueswir1 | 429d0a3 | 2009-01-13 19:48:42 +0000 | [diff] [blame] | 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 | |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 */ |
Juha Riihimäki | 9a0c6a3 | 2009-12-03 15:56:04 +0200 | [diff] [blame] | 251 | } __attribute__((packed)); |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 252 | |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 253 | #endif |