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 #include "helper.h" 37 38 #ifdef HOST_WORDS_BIGENDIAN 39 # ifndef NTOHL 40 # define NTOHL(d) 41 # endif 42 # ifndef NTOHS 43 # define NTOHS(d) 44 # endif 45 # ifndef HTONL 46 # define HTONL(d) 47 # endif 48 # ifndef HTONS 49 # define HTONS(d) 50 # endif 51 #else 52 # ifndef NTOHL 53 # define NTOHL(d) ((d) = ntohl((d))) 54 # endif 55 # ifndef NTOHS 56 # define NTOHS(d) ((d) = ntohs((u_int16_t)(d))) 57 # endif 58 # ifndef HTONL 59 # define HTONL(d) ((d) = htonl((d))) 60 # endif 61 # ifndef HTONS 62 # define HTONS(d) ((d) = htons((u_int16_t)(d))) 63 # endif 64 #endif 65 66 typedef u_int32_t n_long; /* long as received from the net */ 67 68 /* 69 * Definitions for internet protocol version 4. 70 * Per RFC 791, September 1981. 71 */ 72 #define IPVERSION 4 73 74 /* 75 * Structure of an internet header, naked of options. 76 */ 77 struct ip { 78 #ifdef HOST_WORDS_BIGENDIAN 79 u_int ip_v:4; /* version */ 80 u_int ip_hl:4; /* header length */ 81 #else 82 u_int ip_hl:4; /* header length */ 83 u_int ip_v:4; /* version */ 84 #endif 85 u_int8_t ip_tos; /* type of service */ 86 u_int16_t ip_len; /* total length */ 87 u_int16_t ip_id; /* identification */ 88 u_int16_t ip_off; /* fragment offset field */ 89 #define IP_DF 0x4000 /* don't fragment flag */ 90 #define IP_MF 0x2000 /* more fragments flag */ 91 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 92 u_int8_t ip_ttl; /* time to live */ 93 u_int8_t ip_p; /* protocol */ 94 u_int16_t ip_sum; /* checksum */ 95 ipaddr_t ip_src, ip_dst; /* source and dest address */ 96 }; 97 98 #define IP_MAXPACKET 65535 /* maximum packet size */ 99 100 /* 101 * Definitions for IP type of service (ip_tos) 102 */ 103 #define IPTOS_LOWDELAY 0x10 104 #define IPTOS_THROUGHPUT 0x08 105 #define IPTOS_RELIABILITY 0x04 106 107 /* 108 * Definitions for options. 109 */ 110 #define IPOPT_COPIED(o) ((o)&0x80) 111 #define IPOPT_CLASS(o) ((o)&0x60) 112 #define IPOPT_NUMBER(o) ((o)&0x1f) 113 114 #define IPOPT_CONTROL 0x00 115 #define IPOPT_RESERVED1 0x20 116 #define IPOPT_DEBMEAS 0x40 117 #define IPOPT_RESERVED2 0x60 118 119 #define IPOPT_EOL 0 /* end of option list */ 120 #define IPOPT_NOP 1 /* no operation */ 121 122 #define IPOPT_RR 7 /* record packet route */ 123 #define IPOPT_TS 68 /* timestamp */ 124 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 125 #define IPOPT_LSRR 131 /* loose source route */ 126 #define IPOPT_SATID 136 /* satnet id */ 127 #define IPOPT_SSRR 137 /* strict source route */ 128 129 /* 130 * Offsets to fields in options other than EOL and NOP. 131 */ 132 #define IPOPT_OPTVAL 0 /* option ID */ 133 #define IPOPT_OLEN 1 /* option length */ 134 #define IPOPT_OFFSET 2 /* offset within option */ 135 #define IPOPT_MINOFF 4 /* min value of above */ 136 137 /* 138 * Time stamp option structure. 139 */ 140 struct ip_timestamp { 141 u_int8_t ipt_code; /* IPOPT_TS */ 142 u_int8_t ipt_len; /* size of structure (variable) */ 143 u_int8_t ipt_ptr; /* index of current entry */ 144 #ifdef HOST_WORDS_BIGENDIAN 145 u_int ipt_oflw:4, /* overflow counter */ 146 ipt_flg:4; /* flags, see below */ 147 #else 148 u_int ipt_flg:4, /* flags, see below */ 149 ipt_oflw:4; /* overflow counter */ 150 #endif 151 union ipt_timestamp { 152 n_long ipt_time[1]; 153 struct ipt_ta { 154 ipaddr_t ipt_addr; 155 n_long ipt_time; 156 } ipt_ta[1]; 157 } ipt_timestamp; 158 }; 159 160 /* flag bits for ipt_flg */ 161 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 162 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 163 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 164 165 /* bits for security (not byte swapped) */ 166 #define IPOPT_SECUR_UNCLASS 0x0000 167 #define IPOPT_SECUR_CONFID 0xf135 168 #define IPOPT_SECUR_EFTO 0x789a 169 #define IPOPT_SECUR_MMMM 0xbc4d 170 #define IPOPT_SECUR_RESTR 0xaf13 171 #define IPOPT_SECUR_SECRET 0xd788 172 #define IPOPT_SECUR_TOPSECRET 0x6bc5 173 174 /* 175 * Internet implementation parameters. 176 */ 177 #define MAXTTL 255 /* maximum time to live (seconds) */ 178 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 179 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 180 #define IPTTLDEC 1 /* subtracted when forwarding */ 181 182 #define IP_MSS 576 /* default maximum segment size */ 183 184 #if SIZEOF_CHAR_P == 4 185 struct mbuf_ptr { 186 struct mbuf *mptr; 187 uint32_t dummy; 188 }; 189 #else 190 struct mbuf_ptr { 191 struct mbuf *mptr; 192 }; 193 #endif 194 struct qlink { 195 void *next, *prev; 196 }; 197 198 /* 199 * Overlay for ip header used by other protocols (tcp, udp). 200 */ 201 struct ipovly { 202 struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */ 203 u_int8_t ih_x1; /* (unused) */ 204 u_int8_t ih_pr; /* protocol */ 205 u_int16_t ih_len; /* protocol length */ 206 ipaddr_t ih_src; /* source internet address */ 207 ipaddr_t ih_dst; /* destination internet address */ 208 } __attribute__((packed)); 209 210 /* 211 * Ip reassembly queue structure. Each fragment 212 * being reassembled is attached to one of these structures. 213 * They are timed out after ipq_ttl drops to 0, and may also 214 * be reclaimed if memory becomes tight. 215 * size 28 bytes 216 */ 217 struct ipq { 218 struct qlink frag_link; /* to ip headers of fragments */ 219 struct qlink ip_link; /* to other reass headers */ 220 u_int8_t ipq_ttl; /* time for reass q to live */ 221 u_int8_t ipq_p; /* protocol of this fragment */ 222 u_int16_t ipq_id; /* sequence id for reassembly */ 223 ipaddr_t ipq_src,ipq_dst; 224 }; 225 226 /* 227 * Ip header, when holding a fragment. 228 * 229 * Note: ipf_link must be at same offset as frag_link above 230 */ 231 struct ipasfrag { 232 struct qlink ipf_link; 233 struct ip ipf_ip; 234 }; 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 /* 243 * Structure stored in mbuf in inpcb.ip_options 244 * and passed to ip_output when ip options are in use. 245 * The actual length of the options (including ipopt_dst) 246 * is in m_len. 247 */ 248 #define MAX_IPOPTLEN 40 249 250 struct ipoption { 251 u_int32_t ipopt_dst; /* first-hop dst if source routed */ 252 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 253 }; 254 255 #ifdef LOG_ENABLED 256 /* 257 * Structure attached to inpcb.ip_moptions and 258 * passed to ip_output when IP multicast options are in use. 259 */ 260 261 struct ipstat { 262 u_long ips_total; /* total packets received */ 263 u_long ips_badsum; /* checksum bad */ 264 u_long ips_tooshort; /* packet too short */ 265 u_long ips_toosmall; /* not enough data */ 266 u_long ips_badhlen; /* ip header length < data size */ 267 u_long ips_badlen; /* ip length < ip header length */ 268 u_long ips_fragments; /* fragments received */ 269 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 270 u_long ips_fragtimeout; /* fragments timed out */ 271 u_long ips_forward; /* packets forwarded */ 272 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 273 u_long ips_redirectsent; /* packets forwarded on same net */ 274 u_long ips_noproto; /* unknown or unsupported protocol */ 275 u_long ips_delivered; /* datagrams delivered to upper level*/ 276 u_long ips_localout; /* total ip packets generated here */ 277 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 278 u_long ips_reassembled; /* total packets reassembled ok */ 279 u_long ips_fragmented; /* datagrams successfully fragmented */ 280 u_long ips_ofragments; /* output fragments created */ 281 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 282 u_long ips_badoptions; /* error in option processing */ 283 u_long ips_noroute; /* packets discarded due to no route */ 284 u_long ips_badvers; /* ip version != 4 */ 285 u_long ips_rawout; /* total raw ip packets generated */ 286 u_long ips_unaligned; /* times the ip packet was not aligned */ 287 }; 288 289 extern struct ipstat ipstat; 290 #endif 291 292 extern struct ipq ipq; /* ip reass. queue */ 293 extern u_int16_t ip_id; /* ip packet ctr, for ids */ 294 295 #endif 296
