ip_var.h revision 1.45
1/* $OpenBSD: ip_var.h,v 1.45 2013/04/10 08:50:59 mpi 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93 33 */ 34 35#ifndef _NETINET_IP_VAR_H_ 36#define _NETINET_IP_VAR_H_ 37 38#include <sys/queue.h> 39 40/* 41 * Overlay for ip header used by other protocols (tcp, udp). 42 */ 43struct ipovly { 44 u_int8_t ih_x1[9]; /* (unused) */ 45 u_int8_t ih_pr; /* protocol */ 46 u_int16_t ih_len; /* protocol length */ 47 struct in_addr ih_src; /* source internet address */ 48 struct in_addr ih_dst; /* destination internet address */ 49}; 50 51/* 52 * Ip reassembly queue structures. 53 */ 54LIST_HEAD(ipqehead, ipqent); 55struct ipqent { 56 LIST_ENTRY(ipqent) ipqe_q; 57 struct ip *ipqe_ip; 58 struct mbuf *ipqe_m; /* mbuf contains packet */ 59 u_int8_t ipqe_mff; /* for IP fragmentation */ 60}; 61 62/* 63 * Ip reassembly queue structure. Each fragment 64 * being reassembled is attached to one of these structures. 65 * They are timed out after ipq_ttl drops to 0, and may also 66 * be reclaimed if memory becomes tight. 67 */ 68struct ipq { 69 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 70 u_int8_t ipq_ttl; /* time for reass q to live */ 71 u_int8_t ipq_p; /* protocol of this fragment */ 72 u_int16_t ipq_id; /* sequence id for reassembly */ 73 struct ipqehead ipq_fragq; /* to ip fragment queue */ 74 struct in_addr ipq_src, ipq_dst; 75}; 76 77/* 78 * Structure stored in mbuf in inpcb.ip_options 79 * and passed to ip_output when ip options are in use. 80 * The actual length of the options (including ipopt_dst) 81 * is in m_len. 82 */ 83#define MAX_IPOPTLEN 40 84 85struct ipoption { 86 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 87 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 88}; 89 90/* 91 * Structure attached to inpcb.ip_moptions and 92 * passed to ip_output when IP multicast options are in use. 93 */ 94struct ip_moptions { 95 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 96 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 97 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 98 u_int16_t imo_num_memberships; /* no. memberships this socket */ 99 u_int16_t imo_max_memberships; /* max memberships this socket */ 100 struct in_multi **imo_membership; /* group memberships */ 101}; 102 103struct ipstat { 104 u_long ips_total; /* total packets received */ 105 u_long ips_badsum; /* checksum bad */ 106 u_long ips_tooshort; /* packet too short */ 107 u_long ips_toosmall; /* not enough data */ 108 u_long ips_badhlen; /* ip header length < data size */ 109 u_long ips_badlen; /* ip length < ip header length */ 110 u_long ips_fragments; /* fragments received */ 111 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 112 u_long ips_fragtimeout; /* fragments timed out */ 113 u_long ips_forward; /* packets forwarded */ 114 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 115 u_long ips_redirectsent; /* packets forwarded on same net */ 116 u_long ips_noproto; /* unknown or unsupported protocol */ 117 u_long ips_delivered; /* datagrams delivered to upper level*/ 118 u_long ips_localout; /* total ip packets generated here */ 119 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 120 u_long ips_reassembled; /* total packets reassembled ok */ 121 u_long ips_fragmented; /* datagrams successfully fragmented */ 122 u_long ips_ofragments; /* output fragments created */ 123 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 124 u_long ips_badoptions; /* error in option processing */ 125 u_long ips_noroute; /* packets discarded due to no route */ 126 u_long ips_badvers; /* ip version != 4 */ 127 u_long ips_rawout; /* total raw ip packets generated */ 128 u_long ips_badfrags; /* malformed fragments (bad length) */ 129 u_long ips_rcvmemdrop; /* frags dropped for lack of memory */ 130 u_long ips_toolong; /* ip length > max ip packet size */ 131 u_long ips_nogif; /* no match gif found */ 132 u_long ips_badaddr; /* invalid address on header */ 133 u_long ips_inhwcsum; /* hardware checksummed on input */ 134 u_long ips_outhwcsum; /* hardware checksummed on output */ 135 u_long ips_notmember; /* multicasts for unregistered groups */ 136}; 137 138#ifdef _KERNEL 139/* flags passed to ip_output as last parameter */ 140#define IP_FORWARDING 0x1 /* most of ip header exists */ 141#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 142#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 143#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 144#define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */ 145#define IP_ROUTETOETHER 0x1000 /* ether addresses given */ 146#define IP_IPSECFLOW 0x2000 /* IPsec flow info */ 147 148extern struct ipstat ipstat; 149extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 150extern int ip_defttl; /* default IP ttl */ 151#ifdef MROUTING 152extern struct socket *ip_mrouter; /* multicast routing daemon */ 153#endif 154 155extern int ip_mtudisc; /* mtu discovery */ 156extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 157 158extern int ipport_firstauto; /* min port for port allocation */ 159extern int ipport_lastauto; /* max port for port allocation */ 160extern int ipport_hifirstauto; /* min dynamic/private port number */ 161extern int ipport_hilastauto; /* max dynamic/private port number */ 162extern int encdebug; /* enable message reporting */ 163extern int ipforwarding; /* enable IP forwarding */ 164#ifdef MROUTING 165extern int ipmforwarding; /* enable multicast forwarding */ 166#endif 167extern int ipmultipath; /* enable multipath routing */ 168extern int la_hold_total; 169 170extern struct rttimer_queue *ip_mtudisc_timeout_q; 171extern struct pool ipqent_pool; 172struct inpcb; 173 174int ip_ctloutput(int, struct socket *, int, int, struct mbuf **); 175int ip_dooptions(struct mbuf *); 176void ip_drain(void); 177void ip_flush(void); 178void ip_forward(struct mbuf *, int); 179int ip_fragment(struct mbuf *, struct ifnet *, u_long); 180void ip_freef(struct ipq *); 181void ip_freemoptions(struct ip_moptions *); 182int ip_getmoptions(int, struct ip_moptions *, struct mbuf **); 183void ip_init(void); 184int ip_mforward(struct mbuf *, struct ifnet *); 185int ip_optcopy(struct ip *, struct ip *); 186int ip_output(struct mbuf *, ...); 187int ip_pcbopts(struct mbuf **, struct mbuf *); 188struct mbuf * 189 ip_reass(struct ipqent *, struct ipq *); 190struct in_ifaddr * 191 in_iawithaddr(struct in_addr, u_int); 192struct in_ifaddr * 193 ip_rtaddr(struct in_addr, u_int); 194u_int16_t 195 ip_randomid(void); 196int ip_setmoptions(int, struct ip_moptions **, struct mbuf *, u_int); 197void ip_slowtimo(void); 198struct mbuf * 199 ip_srcroute(void); 200void ip_stripoptions(struct mbuf *, struct mbuf *); 201int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 202void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 203 struct mbuf *); 204void ipintr(void); 205void ipv4_input(struct mbuf *); 206int rip_ctloutput(int, struct socket *, int, int, struct mbuf **); 207void rip_init(void); 208void rip_input(struct mbuf *, ...); 209int rip_output(struct mbuf *, ...); 210int rip_usrreq(struct socket *, 211 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); 212#endif /* _KERNEL */ 213#endif /* _NETINET_IP_VAR_H_ */ 214