ip_var.h revision 1.66
1/* $OpenBSD: ip_var.h,v 1.66 2017/01/25 17:34:31 bluhm 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#include <sys/percpu.h> 100 101enum ipstat_counters { 102 ips_total, /* total packets received */ 103 ips_badsum, /* checksum bad */ 104 ips_tooshort, /* packet too short */ 105 ips_toosmall, /* not enough data */ 106 ips_badhlen, /* ip header length < data size */ 107 ips_badlen, /* ip length < ip header length */ 108 ips_fragments, /* fragments received */ 109 ips_fragdropped, /* frags dropped (dups, out of space) */ 110 ips_fragtimeout, /* fragments timed out */ 111 ips_forward, /* packets forwarded */ 112 ips_cantforward, /* packets rcvd for unreachable dest */ 113 ips_redirectsent, /* packets forwarded on same net */ 114 ips_noproto, /* unknown or unsupported protocol */ 115 ips_delivered, /* datagrams delivered to upper level*/ 116 ips_localout, /* total ip packets generated here */ 117 ips_odropped, /* lost packets due to nobufs, etc. */ 118 ips_reassembled, /* total packets reassembled ok */ 119 ips_fragmented, /* datagrams successfully fragmented */ 120 ips_ofragments, /* output fragments created */ 121 ips_cantfrag, /* don't fragment flag was set, etc. */ 122 ips_badoptions, /* error in option processing */ 123 ips_noroute, /* packets discarded due to no route */ 124 ips_badvers, /* ip version != 4 */ 125 ips_rawout, /* total raw ip packets generated */ 126 ips_badfrags, /* malformed fragments (bad length) */ 127 ips_rcvmemdrop, /* frags dropped for lack of memory */ 128 ips_toolong, /* ip length > max ip packet size */ 129 ips_nogif, /* no match gif found */ 130 ips_badaddr, /* invalid address on header */ 131 ips_inswcsum, /* software checksummed on input */ 132 ips_outswcsum, /* software checksummed on output */ 133 ips_notmember, /* multicasts for unregistered groups */ 134 135 ips_ncounters 136}; 137 138extern struct cpumem *ipcounters; 139 140static inline void 141ipstat_inc(enum ipstat_counters c) 142{ 143 counters_inc(ipcounters, c); 144} 145 146/* 147 * Structure attached to inpcb.ip_moptions and 148 * passed to ip_output when IP multicast options are in use. 149 */ 150struct ip_moptions { 151 struct in_multi **imo_membership; /* group memberships */ 152 unsigned short imo_ifidx; /* ifp index for outgoing multicasts */ 153 u_int8_t imo_ttl; /* TTL for outgoing multicasts */ 154 u_int8_t imo_loop; /* 1 => hear sends if a member */ 155 u_int16_t imo_num_memberships; /* no. memberships this socket */ 156 u_int16_t imo_max_memberships; /* max memberships this socket */ 157}; 158 159#include <sys/queue.h> 160 161/* 162 * Ip reassembly queue structures. 163 */ 164LIST_HEAD(ipqehead, ipqent); 165struct ipqent { 166 LIST_ENTRY(ipqent) ipqe_q; 167 struct ip *ipqe_ip; 168 struct mbuf *ipqe_m; /* mbuf contains packet */ 169 u_int8_t ipqe_mff; /* for IP fragmentation */ 170}; 171 172/* 173 * Ip reassembly queue structure. Each fragment 174 * being reassembled is attached to one of these structures. 175 * They are timed out after ipq_ttl drops to 0, and may also 176 * be reclaimed if memory becomes tight. 177 */ 178struct ipq { 179 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 180 u_int8_t ipq_ttl; /* time for reass q to live */ 181 u_int8_t ipq_p; /* protocol of this fragment */ 182 u_int16_t ipq_id; /* sequence id for reassembly */ 183 struct ipqehead ipq_fragq; /* to ip fragment queue */ 184 struct in_addr ipq_src, ipq_dst; 185}; 186 187/* flags passed to ip_output */ 188#define IP_FORWARDING 0x1 /* most of ip header exists */ 189#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 190#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 191#define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */ 192 193extern struct ipstat ipstat; 194extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 195extern int ip_defttl; /* default IP ttl */ 196#ifdef MROUTING 197extern struct socket *ip_mrouter[]; /* multicast routing daemon */ 198#endif 199 200#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 201 202extern int ip_mtudisc; /* mtu discovery */ 203extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 204 205extern int ipport_firstauto; /* min port for port allocation */ 206extern int ipport_lastauto; /* max port for port allocation */ 207extern int ipport_hifirstauto; /* min dynamic/private port number */ 208extern int ipport_hilastauto; /* max dynamic/private port number */ 209extern int encdebug; /* enable message reporting */ 210extern int ipforwarding; /* enable IP forwarding */ 211#ifdef MROUTING 212extern int ipmforwarding; /* enable multicast forwarding */ 213#endif 214extern int ipmultipath; /* enable multipath routing */ 215extern int la_hold_total; 216 217extern struct rttimer_queue *ip_mtudisc_timeout_q; 218extern struct pool ipqent_pool; 219struct route; 220struct inpcb; 221 222int ip_ctloutput(int, struct socket *, int, int, struct mbuf **); 223void ip_drain(void); 224void ip_flush(void); 225int ip_fragment(struct mbuf *, struct ifnet *, u_long); 226void ip_freef(struct ipq *); 227void ip_freemoptions(struct ip_moptions *); 228int ip_getmoptions(int, struct ip_moptions *, struct mbuf **); 229void ip_init(void); 230struct mbuf* 231 ip_insertoptions(struct mbuf *, struct mbuf *, int *); 232int ip_mforward(struct mbuf *, struct ifnet *); 233int ip_optcopy(struct ip *, struct ip *); 234int ip_output(struct mbuf *, struct mbuf *, struct route *, int, 235 struct ip_moptions *, struct inpcb *, u_int32_t); 236int ip_pcbopts(struct mbuf **, struct mbuf *); 237struct mbuf * 238 ip_reass(struct ipqent *, struct ipq *); 239u_int16_t 240 ip_randomid(void); 241void ip_send(struct mbuf *); 242int ip_setmoptions(int, struct ip_moptions **, struct mbuf *, u_int); 243void ip_slowtimo(void); 244struct mbuf * 245 ip_srcroute(struct mbuf *); 246void ip_stripoptions(struct mbuf *); 247int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 248void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 249 struct mbuf *); 250void ipintr(void); 251void ipv4_input(struct mbuf *); 252void ip_forward(struct mbuf *, struct ifnet *, struct rtentry *, int); 253int rip_ctloutput(int, struct socket *, int, int, struct mbuf **); 254void rip_init(void); 255void rip_input(struct mbuf *, int, int); 256int rip_output(struct mbuf *, ...); 257int rip_usrreq(struct socket *, 258 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); 259 260#endif /* _KERNEL */ 261#endif /* _NETINET_IP_VAR_H_ */ 262