ip_var.h revision 1.90
1/* $OpenBSD: ip_var.h,v 1.90 2022/02/25 23:51:03 guenther 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 u_long ips_wrongif; /* packet received on wrong interface */ 91}; 92 93struct ipoption { 94 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 95 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 96}; 97 98#ifdef _KERNEL 99 100#include <sys/percpu.h> 101 102enum ipstat_counters { 103 ips_total, /* total packets received */ 104 ips_badsum, /* checksum bad */ 105 ips_tooshort, /* packet too short */ 106 ips_toosmall, /* not enough data */ 107 ips_badhlen, /* ip header length < data size */ 108 ips_badlen, /* ip length < ip header length */ 109 ips_fragments, /* fragments received */ 110 ips_fragdropped, /* frags dropped (dups, out of space) */ 111 ips_fragtimeout, /* fragments timed out */ 112 ips_forward, /* packets forwarded */ 113 ips_cantforward, /* packets rcvd for unreachable dest */ 114 ips_redirectsent, /* packets forwarded on same net */ 115 ips_noproto, /* unknown or unsupported protocol */ 116 ips_delivered, /* datagrams delivered to upper level*/ 117 ips_localout, /* total ip packets generated here */ 118 ips_odropped, /* lost packets due to nobufs, etc. */ 119 ips_reassembled, /* total packets reassembled ok */ 120 ips_fragmented, /* datagrams successfully fragmented */ 121 ips_ofragments, /* output fragments created */ 122 ips_cantfrag, /* don't fragment flag was set, etc. */ 123 ips_badoptions, /* error in option processing */ 124 ips_noroute, /* packets discarded due to no route */ 125 ips_badvers, /* ip version != 4 */ 126 ips_rawout, /* total raw ip packets generated */ 127 ips_badfrags, /* malformed fragments (bad length) */ 128 ips_rcvmemdrop, /* frags dropped for lack of memory */ 129 ips_toolong, /* ip length > max ip packet size */ 130 ips_nogif, /* no match gif found */ 131 ips_badaddr, /* invalid address on header */ 132 ips_inswcsum, /* software checksummed on input */ 133 ips_outswcsum, /* software checksummed on output */ 134 ips_notmember, /* multicasts for unregistered groups */ 135 ips_wrongif, /* packet received on wrong interface */ 136 137 ips_ncounters 138}; 139 140extern struct cpumem *ipcounters; 141 142static inline void 143ipstat_inc(enum ipstat_counters c) 144{ 145 counters_inc(ipcounters, c); 146} 147 148static inline void 149ipstat_add(enum ipstat_counters c, uint64_t v) 150{ 151 counters_add(ipcounters, c, v); 152} 153 154/* 155 * Structure attached to inpcb.ip_moptions and 156 * passed to ip_output when IP multicast options are in use. 157 */ 158struct ip_moptions { 159 struct in_multi **imo_membership; /* group memberships */ 160 unsigned short imo_ifidx; /* ifp index for outgoing multicasts */ 161 u_int8_t imo_ttl; /* TTL for outgoing multicasts */ 162 u_int8_t imo_loop; /* 1 => hear sends if a member */ 163 u_int16_t imo_num_memberships; /* no. memberships this socket */ 164 u_int16_t imo_max_memberships; /* max memberships this socket */ 165}; 166 167#include <sys/queue.h> 168 169/* 170 * Ip reassembly queue structures. 171 */ 172LIST_HEAD(ipqehead, ipqent); 173struct ipqent { 174 LIST_ENTRY(ipqent) ipqe_q; 175 struct ip *ipqe_ip; 176 struct mbuf *ipqe_m; /* mbuf contains packet */ 177 u_int8_t ipqe_mff; /* for IP fragmentation */ 178}; 179 180/* 181 * Ip reassembly queue structure. Each fragment 182 * being reassembled is attached to one of these structures. 183 * They are timed out after ipq_ttl drops to 0, and may also 184 * be reclaimed if memory becomes tight. 185 */ 186struct ipq { 187 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 188 u_int8_t ipq_ttl; /* time for reass q to live */ 189 u_int8_t ipq_p; /* protocol of this fragment */ 190 u_int16_t ipq_id; /* sequence id for reassembly */ 191 struct ipqehead ipq_fragq; /* to ip fragment queue */ 192 struct in_addr ipq_src, ipq_dst; 193}; 194 195/* flags passed to ip_output */ 196#define IP_FORWARDING 0x1 /* most of ip header exists */ 197#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 198#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 199#define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */ 200 201extern struct ipstat ipstat; 202extern int ip_defttl; /* default IP ttl */ 203 204#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 205 206extern int ip_mtudisc; /* mtu discovery */ 207extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 208 209extern int ipport_firstauto; /* min port for port allocation */ 210extern int ipport_lastauto; /* max port for port allocation */ 211extern int ipport_hifirstauto; /* min dynamic/private port number */ 212extern int ipport_hilastauto; /* max dynamic/private port number */ 213extern int ipforwarding; /* enable IP forwarding */ 214#ifdef MROUTING 215extern int ipmforwarding; /* enable multicast forwarding */ 216#endif 217extern int ipmultipath; /* enable multipath routing */ 218extern int la_hold_total; 219 220extern struct rttimer_queue *ip_mtudisc_timeout_q; 221extern struct pool ipqent_pool; 222struct route; 223struct inpcb; 224 225int ip_ctloutput(int, struct socket *, int, int, struct mbuf *); 226void ip_flush(void); 227int ip_fragment(struct mbuf *, struct mbuf_list *, struct ifnet *, u_long); 228void ip_freef(struct ipq *); 229void ip_freemoptions(struct ip_moptions *); 230int ip_getmoptions(int, struct ip_moptions *, struct mbuf *); 231void ip_init(void); 232struct mbuf* 233 ip_insertoptions(struct mbuf *, struct mbuf *, int *); 234int ip_mforward(struct mbuf *, struct ifnet *); 235int ip_optcopy(struct ip *, struct ip *); 236int ip_output(struct mbuf *, struct mbuf *, struct route *, int, 237 struct ip_moptions *, struct inpcb *, u_int32_t); 238struct mbuf * 239 ip_reass(struct ipqent *, struct ipq *); 240u_int16_t 241 ip_randomid(void); 242void ip_send(struct mbuf *); 243void ip_send_raw(struct mbuf *); 244void ip_slowtimo(void); 245struct mbuf * 246 ip_srcroute(struct mbuf *); 247void ip_stripoptions(struct mbuf *); 248int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 249void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 250 struct mbuf *); 251void ipintr(void); 252int ip_input_if(struct mbuf **, int *, int, int, struct ifnet *); 253int ip_deliver(struct mbuf **, int *, int, int); 254void ip_forward(struct mbuf *, struct ifnet *, struct rtentry *, int); 255int rip_ctloutput(int, struct socket *, int, int, struct mbuf *); 256void rip_init(void); 257int rip_input(struct mbuf **, int *, int, int); 258int rip_output(struct mbuf *, struct socket *, struct sockaddr *, 259 struct mbuf *); 260int rip_usrreq(struct socket *, 261 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); 262int rip_attach(struct socket *, int); 263int rip_detach(struct socket *); 264#ifdef MROUTING 265extern struct socket *ip_mrouter[]; /* multicast routing daemon */ 266#endif 267 268#endif /* _KERNEL */ 269#endif /* _NETINET_IP_VAR_H_ */ 270