ip_var.h revision 2531
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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93 34 * $Id: ip_var.h,v 1.4 1994/08/21 05:27:33 paul Exp $ 35 */ 36 37#ifndef _NETINET_IP_VAR_H_ 38#define _NETINET_IP_VAR_H_ 39 40/* 41 * Overlay for ip header used by other protocols (tcp, udp). 42 */ 43struct ipovly { 44 caddr_t ih_next, ih_prev; /* for protocol sequence q's */ 45 u_char ih_x1; /* (unused) */ 46 u_char ih_pr; /* protocol */ 47 short ih_len; /* protocol length */ 48 struct in_addr ih_src; /* source internet address */ 49 struct in_addr ih_dst; /* destination internet address */ 50}; 51 52/* 53 * Ip reassembly queue structure. Each fragment 54 * being reassembled is attached to one of these structures. 55 * They are timed out after ipq_ttl drops to 0, and may also 56 * be reclaimed if memory becomes tight. 57 */ 58struct ipq { 59 struct ipq *next,*prev; /* to other reass headers */ 60 u_char ipq_ttl; /* time for reass q to live */ 61 u_char ipq_p; /* protocol of this fragment */ 62 u_short ipq_id; /* sequence id for reassembly */ 63 struct ipasfrag *ipq_next,*ipq_prev; 64 /* to ip headers of fragments */ 65 struct in_addr ipq_src,ipq_dst; 66}; 67 68/* 69 * Ip header, when holding a fragment. 70 * 71 * Note: ipf_next must be at same offset as ipq_next above 72 */ 73struct ipasfrag { 74#if BYTE_ORDER == LITTLE_ENDIAN 75 u_char ip_hl:4, 76 ip_v:4; 77#endif 78#if BYTE_ORDER == BIG_ENDIAN 79 u_char ip_v:4, 80 ip_hl:4; 81#endif 82 u_char ipf_mff; /* XXX overlays ip_tos: use low bit 83 * to avoid destroying tos; 84 * copied from (ip_off&IP_MF) */ 85 short ip_len; 86 u_short ip_id; 87 short ip_off; 88 u_char ip_ttl; 89 u_char ip_p; 90 u_short ip_sum; 91 struct ipasfrag *ipf_next; /* next fragment */ 92 struct ipasfrag *ipf_prev; /* previous fragment */ 93}; 94 95/* 96 * Structure stored in mbuf in inpcb.ip_options 97 * and passed to ip_output when ip options are in use. 98 * The actual length of the options (including ipopt_dst) 99 * is in m_len. 100 */ 101#define MAX_IPOPTLEN 40 102 103struct ipoption { 104 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 105 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 106}; 107 108/* 109 * Structure attached to inpcb.ip_moptions and 110 * passed to ip_output when IP multicast options are in use. 111 */ 112struct ip_moptions { 113 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 114 u_long imo_multicast_vif; /* vif num outgoing multicasts */ 115 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 116 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 117 u_short imo_num_memberships; /* no. memberships this socket */ 118 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 119}; 120 121struct ipstat { 122 u_long ips_total; /* total packets received */ 123 u_long ips_badsum; /* checksum bad */ 124 u_long ips_tooshort; /* packet too short */ 125 u_long ips_toosmall; /* not enough data */ 126 u_long ips_badhlen; /* ip header length < data size */ 127 u_long ips_badlen; /* ip length < ip header length */ 128 u_long ips_fragments; /* fragments received */ 129 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 130 u_long ips_fragtimeout; /* fragments timed out */ 131 u_long ips_forward; /* packets forwarded */ 132 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 133 u_long ips_redirectsent; /* packets forwarded on same net */ 134 u_long ips_noproto; /* unknown or unsupported protocol */ 135 u_long ips_delivered; /* datagrams delivered to upper level*/ 136 u_long ips_localout; /* total ip packets generated here */ 137 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 138 u_long ips_reassembled; /* total packets reassembled ok */ 139 u_long ips_fragmented; /* datagrams sucessfully fragmented */ 140 u_long ips_ofragments; /* output fragments created */ 141 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 142 u_long ips_badoptions; /* error in option processing */ 143 u_long ips_noroute; /* packets discarded due to no route */ 144 u_long ips_badvers; /* ip version != 4 */ 145 u_long ips_rawout; /* total raw ip packets generated */ 146}; 147 148#ifdef KERNEL 149/* flags passed to ip_output as last parameter */ 150#define IP_FORWARDING 0x1 /* most of ip header exists */ 151#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 152#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 153#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 154 155extern struct ipstat ipstat; 156extern struct ipq ipq; /* ip reass. queue */ 157extern u_short ip_id; /* ip packet ctr, for ids */ 158extern int ip_defttl; /* default IP ttl */ 159extern struct socket *ip_rsvpd; /* reservation protocol daemon */ 160extern struct socket *ip_mrouter; /* multicast routing daemon */ 161 162int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 163void ip_deq __P((struct ipasfrag *)); 164int ip_dooptions __P((struct mbuf *)); 165void ip_drain __P((void)); 166void ip_enq __P((struct ipasfrag *, struct ipasfrag *)); 167void ip_forward __P((struct mbuf *, int)); 168void ip_freef __P((struct ipq *)); 169void ip_freemoptions __P((struct ip_moptions *)); 170int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **)); 171void ip_init __P((void)); 172int ip_mforward __P((struct ip *, struct ifnet *, struct mbuf *, 173 struct ip_moptions *)); 174int ip_optcopy __P((struct ip *, struct ip *)); 175int ip_output __P((struct mbuf *, 176 struct mbuf *, struct route *, int, struct ip_moptions *)); 177int ip_pcbopts __P((struct mbuf **, struct mbuf *)); 178struct ip * 179 ip_reass __P((struct ipasfrag *, struct ipq *)); 180struct in_ifaddr * 181 ip_rtaddr __P((struct in_addr)); 182int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *)); 183void ip_slowtimo __P((void)); 184struct mbuf * 185 ip_srcroute __P((void)); 186void ip_stripoptions __P((struct mbuf *, struct mbuf *)); 187int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 188void ipintr __P((void)); 189int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 190void rip_init __P((void)); 191void rip_input __P((struct mbuf *)); 192int rip_output __P((struct mbuf *, struct socket *, u_long)); 193int rip_usrreq __P((struct socket *, 194 int, struct mbuf *, struct mbuf *, struct mbuf *)); 195#endif 196 197#endif 198