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. 13 * 3. Neither the name of the University nor the names of its contributors 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 36#ifdef HOST_WORDS_BIGENDIAN 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) 45#else 46# ifndef NTOHL 47# define NTOHL(d) ((d) = ntohl((d))) 48# endif 49# ifndef NTOHS 50# define NTOHS(d) ((d) = ntohs((uint16_t)(d))) 51# endif 52# ifndef HTONL 53# define HTONL(d) ((d) = htonl((d))) 54# endif 55# ifndef HTONS 56# define HTONS(d) ((d) = htons((uint16_t)(d))) 57# endif 58#endif 59 60typedef uint32_t n_long; /* long as received from the net */ 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 */ 71struct ip { 72#ifdef HOST_WORDS_BIGENDIAN 73 uint8_t ip_v:4, /* version */ 74 ip_hl:4; /* header length */ 75#else 76 uint8_t ip_hl:4, /* header length */ 77 ip_v:4; /* version */ 78#endif 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 */ 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 */ 86 uint8_t ip_ttl; /* time to live */ 87 uint8_t ip_p; /* protocol */ 88 uint16_t ip_sum; /* checksum */ 89 struct in_addr ip_src,ip_dst; /* source and dest address */ 90} QEMU_PACKED; 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 */ 134struct ip_timestamp { 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 */ 138#ifdef HOST_WORDS_BIGENDIAN 139 uint8_t ipt_oflw:4, /* overflow counter */ 140 ipt_flg:4; /* flags, see below */ 141#else 142 uint8_t ipt_flg:4, /* flags, see below */ 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; 152} QEMU_PACKED; 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 179struct mbuf_ptr { 180 struct mbuf *mptr; 181 uint32_t dummy; 182} QEMU_PACKED; 183#else 184struct mbuf_ptr { 185 struct mbuf *mptr; 186} QEMU_PACKED; 187#endif 188struct qlink { 189 void *next, *prev; 190}; 191 192/* 193 * Overlay for ip header used by other protocols (tcp, udp). 194 */ 195struct ipovly { 196 struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */ 197 uint8_t ih_x1; /* (unused) */ 198 uint8_t ih_pr; /* protocol */ 199 uint16_t ih_len; /* protocol length */ 200 struct in_addr ih_src; /* source internet address */ 201 struct in_addr ih_dst; /* destination internet address */ 202} QEMU_PACKED; 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 */ 211struct ipq { 212 struct qlink frag_link; /* to ip headers of fragments */ 213 struct qlink ip_link; /* to other reass headers */ 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 */ 217 struct in_addr ipq_src,ipq_dst; 218} QEMU_PACKED; 219 220/* 221 * Ip header, when holding a fragment. 222 * 223 * Note: ipf_link must be at same offset as frag_link above 224 */ 225struct ipasfrag { 226 struct qlink ipf_link; 227 struct ip ipf_ip; 228} QEMU_PACKED; 229 230#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 234#define ipf_prev ipf_link.prev 235 236/* 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 244struct ipoption { 245 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 246 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 247} QEMU_PACKED; 248 249#endif 250