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