ip_var.h revision 1.23
1/* $OpenBSD: ip_var.h,v 1.23 2002/05/28 15:44:28 jasoni 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#ifndef _NETINET_IP_VAR_H_ 40#define _NETINET_IP_VAR_H_ 41 42#include <sys/queue.h> 43 44/* 45 * Overlay for ip header used by other protocols (tcp, udp). 46 */ 47struct ipovly { 48 u_int8_t ih_x1[9]; /* (unused) */ 49 u_int8_t ih_pr; /* protocol */ 50 u_int16_t ih_len; /* protocol length */ 51 struct in_addr ih_src; /* source internet address */ 52 struct in_addr ih_dst; /* destination internet address */ 53}; 54 55/* 56 * Ip (reassembly or sequence) queue structures. 57 * 58 * XXX -- The following explains why the ipqe_m field is here, for TCP's use: 59 * We want to avoid doing m_pullup on incoming packets but that 60 * means avoiding dtom on the tcp reassembly code. That in turn means 61 * keeping an mbuf pointer in the reassembly queue (since we might 62 * have a cluster). As a quick hack, the source & destination 63 * port numbers (which are no longer needed once we've located the 64 * tcpcb) are overlayed with an mbuf pointer. 65 */ 66LIST_HEAD(ipqehead, ipqent); 67struct ipqent { 68 LIST_ENTRY(ipqent) ipqe_q; 69 union { 70 struct ip *_ip; 71 struct tcphdr *_tcp; 72 } _ipqe_u1; 73 struct mbuf *ipqe_m; /* mbuf contains packet */ 74 u_int8_t ipqe_mff; /* for IP fragmentation */ 75}; 76#define ipqe_ip _ipqe_u1._ip 77#define ipqe_tcp _ipqe_u1._tcp 78 79/* 80 * Ip reassembly queue structure. Each fragment 81 * being reassembled is attached to one of these structures. 82 * They are timed out after ipq_ttl drops to 0, and may also 83 * be reclaimed if memory becomes tight. 84 */ 85struct ipq { 86 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 87 u_int8_t ipq_ttl; /* time for reass q to live */ 88 u_int8_t ipq_p; /* protocol of this fragment */ 89 u_int16_t ipq_id; /* sequence id for reassembly */ 90 struct ipqehead ipq_fragq; /* to ip fragment queue */ 91 struct in_addr ipq_src, ipq_dst; 92}; 93 94/* 95 * Structure stored in mbuf in inpcb.ip_options 96 * and passed to ip_output when ip options are in use. 97 * The actual length of the options (including ipopt_dst) 98 * is in m_len. 99 */ 100#define MAX_IPOPTLEN 40 101 102struct ipoption { 103 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 104 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 105}; 106 107/* 108 * Structure attached to inpcb.ip_moptions and 109 * passed to ip_output when IP multicast options are in use. 110 */ 111struct ip_moptions { 112 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 113 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 114 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 115 u_int16_t imo_num_memberships; /* no. memberships this socket */ 116 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 117}; 118 119struct ipstat { 120 u_long ips_total; /* total packets received */ 121 u_long ips_badsum; /* checksum bad */ 122 u_long ips_tooshort; /* packet too short */ 123 u_long ips_toosmall; /* not enough data */ 124 u_long ips_badhlen; /* ip header length < data size */ 125 u_long ips_badlen; /* ip length < ip header length */ 126 u_long ips_fragments; /* fragments received */ 127 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 128 u_long ips_fragtimeout; /* fragments timed out */ 129 u_long ips_forward; /* packets forwarded */ 130 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 131 u_long ips_redirectsent; /* packets forwarded on same net */ 132 u_long ips_noproto; /* unknown or unsupported protocol */ 133 u_long ips_delivered; /* datagrams delivered to upper level*/ 134 u_long ips_localout; /* total ip packets generated here */ 135 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 136 u_long ips_reassembled; /* total packets reassembled ok */ 137 u_long ips_fragmented; /* datagrams sucessfully fragmented */ 138 u_long ips_ofragments; /* output fragments created */ 139 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 140 u_long ips_badoptions; /* error in option processing */ 141 u_long ips_noroute; /* packets discarded due to no route */ 142 u_long ips_badvers; /* ip version != 4 */ 143 u_long ips_rawout; /* total raw ip packets generated */ 144 u_long ips_badfrags; /* malformed fragments (bad length) */ 145 u_long ips_rcvmemdrop; /* frags dropped for lack of memory */ 146 u_long ips_toolong; /* ip length > max ip packet size */ 147 u_long ips_nogif; /* no match gif found */ 148 u_long ips_badaddr; /* invalid address on header */ 149 u_long ips_inhwcsum; /* hardware checksummed on input */ 150 u_long ips_outhwcsum; /* hardware checksummed on output */ 151}; 152 153#ifdef _KERNEL 154/* flags passed to ip_output as last parameter */ 155#define IP_FORWARDING 0x1 /* most of ip header exists */ 156#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 157#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 158#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 159#define IP_MTUDISC 0x0400 /* pmtu discovery, set DF */ 160 161struct ipstat ipstat; 162LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 163int ip_defttl; /* default IP ttl */ 164 165int ip_mtudisc; /* mtu discovery */ 166u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 167struct rttimer_queue *ip_mtudisc_timeout_q; 168extern struct pool ipqent_pool; 169 170int ip_ctloutput(int, struct socket *, int, int, struct mbuf **); 171int ip_dooptions(struct mbuf *); 172void ip_drain(void); 173void ip_flush(void); 174void ip_forward(struct mbuf *, int); 175int ip_fragment(struct mbuf *, struct ifnet *); 176void ip_freef(struct ipq *); 177void ip_freemoptions(struct ip_moptions *); 178int ip_getmoptions(int, struct ip_moptions *, struct mbuf **); 179void ip_init(void); 180int ip_mforward(struct mbuf *, struct ifnet *); 181int ip_optcopy(struct ip *, struct ip *); 182int ip_output(struct mbuf *, ...); 183int ip_pcbopts(struct mbuf **, struct mbuf *); 184struct mbuf * 185 ip_reass(struct ipqent *, struct ipq *); 186struct in_ifaddr * 187 in_iawithaddr(struct in_addr, struct mbuf *); 188struct in_ifaddr * 189 ip_rtaddr(struct in_addr); 190u_int16_t 191 ip_randomid(void); 192int ip_setmoptions(int, struct ip_moptions **, struct mbuf *); 193void ip_slowtimo(void); 194struct mbuf * 195 ip_srcroute(void); 196void ip_stripoptions(struct mbuf *, struct mbuf *); 197int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 198void ipintr(void); 199void ipv4_input(struct mbuf *); 200int rip_ctloutput(int, struct socket *, int, int, struct mbuf **); 201void rip_init(void); 202void rip_input(struct mbuf *, ...); 203int rip_output(struct mbuf *, ...); 204int rip_usrreq(struct socket *, 205 int, struct mbuf *, struct mbuf *, struct mbuf *); 206#endif /* _KERNEL */ 207#endif /* _NETINET_IP_VAR_H_ */ 208