ip_var.h revision 1.62
1/* $OpenBSD: ip_var.h,v 1.62 2016/04/15 11:18:40 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/* 39 * Structure stored in mbuf in inpcb.ip_options 40 * and passed to ip_output when ip options are in use. 41 * The actual length of the options (including ipopt_dst) 42 * is in m_len. 43 */ 44#define MAX_IPOPTLEN 40 45 46/* 47 * Overlay for ip header used by other protocols (tcp, udp). 48 */ 49struct ipovly { 50 u_int8_t ih_x1[9]; /* (unused) */ 51 u_int8_t ih_pr; /* protocol */ 52 u_int16_t ih_len; /* protocol length */ 53 struct in_addr ih_src; /* source internet address */ 54 struct in_addr ih_dst; /* destination internet address */ 55}; 56 57struct ipstat { 58 u_long ips_total; /* total packets received */ 59 u_long ips_badsum; /* checksum bad */ 60 u_long ips_tooshort; /* packet too short */ 61 u_long ips_toosmall; /* not enough data */ 62 u_long ips_badhlen; /* ip header length < data size */ 63 u_long ips_badlen; /* ip length < ip header length */ 64 u_long ips_fragments; /* fragments received */ 65 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 66 u_long ips_fragtimeout; /* fragments timed out */ 67 u_long ips_forward; /* packets forwarded */ 68 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 69 u_long ips_redirectsent; /* packets forwarded on same net */ 70 u_long ips_noproto; /* unknown or unsupported protocol */ 71 u_long ips_delivered; /* datagrams delivered to upper level*/ 72 u_long ips_localout; /* total ip packets generated here */ 73 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 74 u_long ips_reassembled; /* total packets reassembled ok */ 75 u_long ips_fragmented; /* datagrams successfully fragmented */ 76 u_long ips_ofragments; /* output fragments created */ 77 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 78 u_long ips_badoptions; /* error in option processing */ 79 u_long ips_noroute; /* packets discarded due to no route */ 80 u_long ips_badvers; /* ip version != 4 */ 81 u_long ips_rawout; /* total raw ip packets generated */ 82 u_long ips_badfrags; /* malformed fragments (bad length) */ 83 u_long ips_rcvmemdrop; /* frags dropped for lack of memory */ 84 u_long ips_toolong; /* ip length > max ip packet size */ 85 u_long ips_nogif; /* no match gif found */ 86 u_long ips_badaddr; /* invalid address on header */ 87 u_long ips_inswcsum; /* software checksummed on input */ 88 u_long ips_outswcsum; /* software checksummed on output */ 89 u_long ips_notmember; /* multicasts for unregistered groups */ 90}; 91 92struct ipoption { 93 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 94 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 95}; 96 97#ifdef _KERNEL 98 99/* 100 * Structure attached to inpcb.ip_moptions and 101 * passed to ip_output when IP multicast options are in use. 102 */ 103struct ip_moptions { 104 struct in_multi **imo_membership; /* group memberships */ 105 unsigned short imo_ifidx; /* ifp index for outgoing multicasts */ 106 u_int8_t imo_ttl; /* TTL for outgoing multicasts */ 107 u_int8_t imo_loop; /* 1 => hear sends if a member */ 108 u_int16_t imo_num_memberships; /* no. memberships this socket */ 109 u_int16_t imo_max_memberships; /* max memberships this socket */ 110}; 111 112#include <sys/queue.h> 113 114/* 115 * Ip reassembly queue structures. 116 */ 117LIST_HEAD(ipqehead, ipqent); 118struct ipqent { 119 LIST_ENTRY(ipqent) ipqe_q; 120 struct ip *ipqe_ip; 121 struct mbuf *ipqe_m; /* mbuf contains packet */ 122 u_int8_t ipqe_mff; /* for IP fragmentation */ 123}; 124 125/* 126 * Ip reassembly queue structure. Each fragment 127 * being reassembled is attached to one of these structures. 128 * They are timed out after ipq_ttl drops to 0, and may also 129 * be reclaimed if memory becomes tight. 130 */ 131struct ipq { 132 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 133 u_int8_t ipq_ttl; /* time for reass q to live */ 134 u_int8_t ipq_p; /* protocol of this fragment */ 135 u_int16_t ipq_id; /* sequence id for reassembly */ 136 struct ipqehead ipq_fragq; /* to ip fragment queue */ 137 struct in_addr ipq_src, ipq_dst; 138}; 139 140/* flags passed to ip_output */ 141#define IP_FORWARDING 0x1 /* most of ip header exists */ 142#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 143#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 144#define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */ 145 146extern struct ipstat ipstat; 147extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 148extern int ip_defttl; /* default IP ttl */ 149#ifdef MROUTING 150extern struct socket *ip_mrouter; /* multicast routing daemon */ 151#endif 152 153#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 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 route; 173struct inpcb; 174 175int ip_ctloutput(int, struct socket *, int, int, struct mbuf **); 176void ip_drain(void); 177void ip_flush(void); 178int ip_fragment(struct mbuf *, struct ifnet *, u_long); 179void ip_freef(struct ipq *); 180void ip_freemoptions(struct ip_moptions *); 181int ip_getmoptions(int, struct ip_moptions *, struct mbuf **); 182void ip_init(void); 183struct mbuf* 184 ip_insertoptions(struct mbuf *, struct mbuf *, int *); 185int ip_mforward(struct mbuf *, struct ifnet *); 186int ip_optcopy(struct ip *, struct ip *); 187int ip_output(struct mbuf *, struct mbuf *, struct route *, int, 188 struct ip_moptions *, struct inpcb *, u_int32_t); 189int ip_pcbopts(struct mbuf **, struct mbuf *); 190struct mbuf * 191 ip_reass(struct ipqent *, struct ipq *); 192u_int16_t 193 ip_randomid(void); 194void ip_send(struct mbuf *); 195int ip_setmoptions(int, struct ip_moptions **, struct mbuf *, u_int); 196void ip_slowtimo(void); 197struct mbuf * 198 ip_srcroute(struct mbuf *); 199void ip_stripoptions(struct mbuf *); 200int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 201void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 202 struct mbuf *); 203void ipintr(void); 204void ipv4_input(struct mbuf *); 205int rip_ctloutput(int, struct socket *, int, int, struct mbuf **); 206void rip_init(void); 207void rip_input(struct mbuf *, ...); 208int rip_output(struct mbuf *, ...); 209int rip_usrreq(struct socket *, 210 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); 211 212#endif /* _KERNEL */ 213#endif /* _NETINET_IP_VAR_H_ */ 214