ip_var.h revision 1.8
1/* $OpenBSD: ip_var.h,v 1.8 1998/02/14 18:50:36 mickey Exp $ */ 2/* $NetBSD: ip_var.h,v 1.16 1996/02/13 23:43:20 christos Exp $ */ 3 4/* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93 37 */ 38 39#include <sys/queue.h> 40 41/* 42 * Overlay for ip header used by other protocols (tcp, udp). 43 */ 44struct ipovly { 45 u_int8_t ih_x1[9]; /* (unused) */ 46 u_int8_t ih_pr; /* protocol */ 47 u_int16_t 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 or sequence) queue structures. 54 * 55 * XXX -- The following explains why the ipqe_m field is here, for TCP's use: 56 * We want to avoid doing m_pullup on incoming packets but that 57 * means avoiding dtom on the tcp reassembly code. That in turn means 58 * keeping an mbuf pointer in the reassembly queue (since we might 59 * have a cluster). As a quick hack, the source & destination 60 * port numbers (which are no longer needed once we've located the 61 * tcpcb) are overlayed with an mbuf pointer. 62 */ 63LIST_HEAD(ipqehead, ipqent); 64struct ipqent { 65 LIST_ENTRY(ipqent) ipqe_q; 66 union { 67 struct ip *_ip; 68 struct tcpiphdr *_tcp; 69 } _ipqe_u1; 70 union { 71 u_int8_t _mff; /* for IP fragmentation */ 72 struct mbuf *_m; /* XXX for TCP; see above */ 73 } _ipqe_u2; 74}; 75#define ipqe_ip _ipqe_u1._ip 76#define ipqe_tcp _ipqe_u1._tcp 77#define ipqe_mff _ipqe_u2._mff 78#define ipqe_m _ipqe_u2._m 79 80/* 81 * Ip reassembly queue structure. Each fragment 82 * being reassembled is attached to one of these structures. 83 * They are timed out after ipq_ttl drops to 0, and may also 84 * be reclaimed if memory becomes tight. 85 */ 86struct ipq { 87 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 88 u_int8_t ipq_ttl; /* time for reass q to live */ 89 u_int8_t ipq_p; /* protocol of this fragment */ 90 u_int16_t ipq_id; /* sequence id for reassembly */ 91 struct ipqehead ipq_fragq; /* to ip fragment queue */ 92 struct in_addr ipq_src, ipq_dst; 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 int8_t 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_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 115 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 116 u_int16_t imo_num_memberships; /* no. memberships this socket */ 117 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 118}; 119 120struct ipstat { 121 u_long ips_total; /* total packets received */ 122 u_long ips_badsum; /* checksum bad */ 123 u_long ips_tooshort; /* packet too short */ 124 u_long ips_toosmall; /* not enough data */ 125 u_long ips_badhlen; /* ip header length < data size */ 126 u_long ips_badlen; /* ip length < ip header length */ 127 u_long ips_fragments; /* fragments received */ 128 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 129 u_long ips_fragtimeout; /* fragments timed out */ 130 u_long ips_forward; /* packets forwarded */ 131 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 132 u_long ips_redirectsent; /* packets forwarded on same net */ 133 u_long ips_noproto; /* unknown or unsupported protocol */ 134 u_long ips_delivered; /* datagrams delivered to upper level*/ 135 u_long ips_localout; /* total ip packets generated here */ 136 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 137 u_long ips_reassembled; /* total packets reassembled ok */ 138 u_long ips_fragmented; /* datagrams sucessfully fragmented */ 139 u_long ips_ofragments; /* output fragments created */ 140 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 141 u_long ips_badoptions; /* error in option processing */ 142 u_long ips_noroute; /* packets discarded due to no route */ 143 u_long ips_badvers; /* ip version != 4 */ 144 u_long ips_rawout; /* total raw ip packets generated */ 145 u_long ips_badfrags; /* malformed fragments (bad length) */ 146 u_long ips_rcvmemdrop; /* frags dropped for lack of memory */ 147 u_long ips_toolong; /* ip length > max ip packet size */ 148}; 149 150#ifdef _KERNEL 151/* flags passed to ip_output as last parameter */ 152#define IP_FORWARDING 0x1 /* most of ip header exists */ 153#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 154#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 155#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 156 157#ifdef IPSEC 158#define IP_ENCAPSULATED 0x0800 /* encapsulated already */ 159#endif 160 161struct ipstat ipstat; 162LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 163u_int16_t ip_id; /* ip packet ctr, for ids */ 164int ip_defttl; /* default IP ttl */ 165 166int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 167int ip_dooptions __P((struct mbuf *)); 168void ip_drain __P((void)); 169void ip_forward __P((struct mbuf *, int)); 170void ip_freef __P((struct ipq *)); 171void ip_freemoptions __P((struct ip_moptions *)); 172int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **)); 173void ip_init __P((void)); 174int ip_mforward __P((struct mbuf *, struct ifnet *)); 175int ip_optcopy __P((struct ip *, struct ip *)); 176int ip_output __P((struct mbuf *, ...)); 177int ip_pcbopts __P((struct mbuf **, struct mbuf *)); 178struct ip * 179 ip_reass __P((struct ipqent *, struct ipq *)); 180struct in_ifaddr * 181 in_iawithaddr __P((struct in_addr, struct mbuf *)); 182struct in_ifaddr * 183 ip_rtaddr __P((struct in_addr)); 184int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *)); 185void ip_slowtimo __P((void)); 186struct mbuf * 187 ip_srcroute __P((void)); 188void ip_stripoptions __P((struct mbuf *, struct mbuf *)); 189int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 190void ipintr __P((void)); 191int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 192void rip_init __P((void)); 193void rip_input __P((struct mbuf *, ...)); 194int rip_output __P((struct mbuf *, ...)); 195int rip_usrreq __P((struct socket *, 196 int, struct mbuf *, struct mbuf *, struct mbuf *)); 197#endif 198