/* * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip.h 8.1 (Berkeley) 6/10/93 * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp */ #ifndef _IP_H_ #define _IP_H_ #ifdef WORDS_BIGENDIAN # ifndef NTOHL # define NTOHL(d) # endif # ifndef NTOHS # define NTOHS(d) # endif # ifndef HTONL # define HTONL(d) # endif # ifndef HTONS # define HTONS(d) # endif #else # ifndef NTOHL # define NTOHL(d) ((d) = ntohl((d))) # endif # ifndef NTOHS # define NTOHS(d) ((d) = ntohs((u_int16_t)(d))) # endif # ifndef HTONL # define HTONL(d) ((d) = htonl((d))) # endif # ifndef HTONS # define HTONS(d) ((d) = htons((u_int16_t)(d))) # endif #endif typedef u_int32_t n_long; /* long as received from the net */ /* * Definitions for internet protocol version 4. * Per RFC 791, September 1981. */ #define IPVERSION 4 /* * Structure of an internet header, naked of options. */ struct ip { #ifdef WORDS_BIGENDIAN u_int ip_v:4, /* version */ ip_hl:4; /* header length */ #else u_int ip_hl:4, /* header length */ ip_v:4; /* version */ #endif u_int8_t ip_tos; /* type of service */ u_int16_t ip_len; /* total length */ u_int16_t ip_id; /* identification */ u_int16_t ip_off; /* fragment offset field */ #define IP_DF 0x4000 /* don't fragment flag */ #define IP_MF 0x2000 /* more fragments flag */ #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ u_int8_t ip_ttl; /* time to live */ u_int8_t ip_p; /* protocol */ u_int16_t ip_sum; /* checksum */ struct in_addr ip_src,ip_dst; /* source and dest address */ }; #define IP_MAXPACKET 65535 /* maximum packet size */ /* * Definitions for IP type of service (ip_tos) */ #define IPTOS_LOWDELAY 0x10 #define IPTOS_THROUGHPUT 0x08 #define IPTOS_RELIABILITY 0x04 /* * Definitions for options. */ #define IPOPT_COPIED(o) ((o)&0x80) #define IPOPT_CLASS(o) ((o)&0x60) #define IPOPT_NUMBER(o) ((o)&0x1f) #define IPOPT_CONTROL 0x00 #define IPOPT_RESERVED1 0x20 #define IPOPT_DEBMEAS 0x40 #define IPOPT_RESERVED2 0x60 #define IPOPT_EOL 0 /* end of option list */ #define IPOPT_NOP 1 /* no operation */ #define IPOPT_RR 7 /* record packet route */ #define IPOPT_TS 68 /* timestamp */ #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ #define IPOPT_LSRR 131 /* loose source route */ #define IPOPT_SATID 136 /* satnet id */ #define IPOPT_SSRR 137 /* strict source route */ /* * Offsets to fields in options other than EOL and NOP. */ #define IPOPT_OPTVAL 0 /* option ID */ #define IPOPT_OLEN 1 /* option length */ #define IPOPT_OFFSET 2 /* offset within option */ #define IPOPT_MINOFF 4 /* min value of above */ /* * Time stamp option structure. */ struct ip_timestamp { u_int8_t ipt_code; /* IPOPT_TS */ u_int8_t ipt_len; /* size of structure (variable) */ u_int8_t ipt_ptr; /* index of current entry */ #ifdef WORDS_BIGENDIAN u_int ipt_oflw:4, /* overflow counter */ ipt_flg:4; /* flags, see below */ #else u_int ipt_flg:4, /* flags, see below */ ipt_oflw:4; /* overflow counter */ #endif union ipt_timestamp { n_long ipt_time[1]; struct ipt_ta { struct in_addr ipt_addr; n_long ipt_time; } ipt_ta[1]; } ipt_timestamp; }; /* flag bits for ipt_flg */ #define IPOPT_TS_TSONLY 0 /* timestamps only */ #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ #define IPOPT_TS_PRESPEC 3 /* specified modules only */ /* bits for security (not byte swapped) */ #define IPOPT_SECUR_UNCLASS 0x0000 #define IPOPT_SECUR_CONFID 0xf135 #define IPOPT_SECUR_EFTO 0x789a #define IPOPT_SECUR_MMMM 0xbc4d #define IPOPT_SECUR_RESTR 0xaf13 #define IPOPT_SECUR_SECRET 0xd788 #define IPOPT_SECUR_TOPSECRET 0x6bc5 /* * Internet implementation parameters. */ #define MAXTTL 255 /* maximum time to live (seconds) */ #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ #define IPFRAGTTL 60 /* time to live for frags, slowhz */ #define IPTTLDEC 1 /* subtracted when forwarding */ #define IP_MSS 576 /* default maximum segment size */ #ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */ #include #else #if SIZEOF_CHAR_P == 4 typedef caddr_t caddr32_t; #else typedef u_int32_t caddr32_t; #endif #endif #if SIZEOF_CHAR_P == 4 typedef struct ipq *ipqp_32; typedef struct ipasfrag *ipasfragp_32; #else typedef caddr32_t ipqp_32; typedef caddr32_t ipasfragp_32; #endif /* * Overlay for ip header used by other protocols (tcp, udp). */ struct ipovly { caddr32_t ih_next, ih_prev; /* for protocol sequence q's */ u_int8_t ih_x1; /* (unused) */ u_int8_t ih_pr; /* protocol */ u_int16_t ih_len; /* protocol length */ struct in_addr ih_src; /* source internet address */ struct in_addr ih_dst; /* destination internet address */ }; /* * Ip reassembly queue structure. Each fragment * being reassembled is attached to one of these structures. * They are timed out after ipq_ttl drops to 0, and may also * be reclaimed if memory becomes tight. * size 28 bytes */ struct ipq { ipqp_32 next,prev; /* to other reass headers */ u_int8_t ipq_ttl; /* time for reass q to live */ u_int8_t ipq_p; /* protocol of this fragment */ u_int16_t ipq_id; /* sequence id for reassembly */ ipasfragp_32 ipq_next,ipq_prev; /* to ip headers of fragments */ struct in_addr ipq_src,ipq_dst; }; /* * Ip header, when holding a fragment. * * Note: ipf_next must be at same offset as ipq_next above */ struct ipasfrag { #ifdef WORDS_BIGENDIAN u_int ip_v:4, ip_hl:4; #else u_int ip_hl:4, ip_v:4; #endif /* BUG : u_int changed to u_int8_t. * sizeof(u_int)==4 on linux 2.0 */ u_int8_t ipf_mff; /* XXX overlays ip_tos: use low bit * to avoid destroying tos (PPPDTRuu); * copied from (ip_off&IP_MF) */ u_int16_t ip_len; u_int16_t ip_id; u_int16_t ip_off; u_int8_t ip_ttl; u_int8_t ip_p; u_int16_t ip_sum; ipasfragp_32 ipf_next; /* next fragment */ ipasfragp_32 ipf_prev; /* previous fragment */ }; /* * Structure stored in mbuf in inpcb.ip_options * and passed to ip_output when ip options are in use. * The actual length of the options (including ipopt_dst) * is in m_len. */ #define MAX_IPOPTLEN 40 struct ipoption { struct in_addr ipopt_dst; /* first-hop dst if source routed */ int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ }; #ifdef LOG_ENABLED /* * Structure attached to inpcb.ip_moptions and * passed to ip_output when IP multicast options are in use. */ struct ipstat { u_long ips_total; /* total packets received */ u_long ips_badsum; /* checksum bad */ u_long ips_tooshort; /* packet too short */ u_long ips_toosmall; /* not enough data */ u_long ips_badhlen; /* ip header length < data size */ u_long ips_badlen; /* ip length < ip header length */ u_long ips_fragments; /* fragments received */ u_long ips_fragdropped; /* frags dropped (dups, out of space) */ u_long ips_fragtimeout; /* fragments timed out */ u_long ips_forward; /* packets forwarded */ u_long ips_cantforward; /* packets rcvd for unreachable dest */ u_long ips_redirectsent; /* packets forwarded on same net */ u_long ips_noproto; /* unknown or unsupported protocol */ u_long ips_delivered; /* datagrams delivered to upper level*/ u_long ips_localout; /* total ip packets generated here */ u_long ips_odropped; /* lost packets due to nobufs, etc. */ u_long ips_reassembled; /* total packets reassembled ok */ u_long ips_fragmented; /* datagrams successfully fragmented */ u_long ips_ofragments; /* output fragments created */ u_long ips_cantfrag; /* don't fragment flag was set, etc. */ u_long ips_badoptions; /* error in option processing */ u_long ips_noroute; /* packets discarded due to no route */ u_long ips_badvers; /* ip version != 4 */ u_long ips_rawout; /* total raw ip packets generated */ u_long ips_unaligned; /* times the ip packet was not aligned */ }; extern struct ipstat ipstat; #endif extern struct ipq ipq; /* ip reass. queue */ extern u_int16_t ip_id; /* ip packet ctr, for ids */ #endif