1/* $OpenBSD: ip_var.h,v 1.119 2024/07/02 18:33:47 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 output 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_rtcachehit; /* valid route found in cache */ 91 u_long ips_rtcachemiss; /* route cache with new destination */ 92 u_long ips_wrongif; /* packet received on wrong interface */ 93 u_long ips_idropped; /* lost input due to nobufs, etc. */ 94}; 95 96struct ipoption { 97 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 98 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 99}; 100 101#ifdef _KERNEL 102 103#include <sys/percpu.h> 104 105enum ipstat_counters { 106 ips_total, /* total packets received */ 107 ips_badsum, /* checksum bad */ 108 ips_tooshort, /* packet too short */ 109 ips_toosmall, /* not enough data */ 110 ips_badhlen, /* ip header length < data size */ 111 ips_badlen, /* ip length < ip header length */ 112 ips_fragments, /* fragments received */ 113 ips_fragdropped, /* frags dropped (dups, out of space) */ 114 ips_fragtimeout, /* fragments timed out */ 115 ips_forward, /* packets forwarded */ 116 ips_cantforward, /* packets rcvd for unreachable dest */ 117 ips_redirectsent, /* packets forwarded on same net */ 118 ips_noproto, /* unknown or unsupported protocol */ 119 ips_delivered, /* datagrams delivered to upper level*/ 120 ips_localout, /* total ip packets generated here */ 121 ips_odropped, /* lost output packets due to nobufs, etc. */ 122 ips_reassembled, /* total packets reassembled ok */ 123 ips_fragmented, /* datagrams successfully fragmented */ 124 ips_ofragments, /* output fragments created */ 125 ips_cantfrag, /* don't fragment flag was set, etc. */ 126 ips_badoptions, /* error in option processing */ 127 ips_noroute, /* packets discarded due to no route */ 128 ips_badvers, /* ip version != 4 */ 129 ips_rawout, /* total raw ip packets generated */ 130 ips_badfrags, /* malformed fragments (bad length) */ 131 ips_rcvmemdrop, /* frags dropped for lack of memory */ 132 ips_toolong, /* ip length > max ip packet size */ 133 ips_nogif, /* no match gif found */ 134 ips_badaddr, /* invalid address on header */ 135 ips_inswcsum, /* software checksummed on input */ 136 ips_outswcsum, /* software checksummed on output */ 137 ips_notmember, /* multicasts for unregistered groups */ 138 ips_rtcachehit, /* valid route to destination found in cache */ 139 ips_rtcachemiss, /* route cache filled with new destination */ 140 ips_wrongif, /* packet received on wrong interface */ 141 ips_idropped, /* lost input packets due to nobufs, etc. */ 142 143 ips_ncounters 144}; 145 146extern struct cpumem *ipcounters; 147 148static inline void 149ipstat_inc(enum ipstat_counters c) 150{ 151 counters_inc(ipcounters, c); 152} 153 154static inline void 155ipstat_add(enum ipstat_counters c, uint64_t v) 156{ 157 counters_add(ipcounters, c, v); 158} 159 160/* 161 * Structure attached to inpcb.ip_moptions and 162 * passed to ip_output when IP multicast options are in use. 163 */ 164struct ip_moptions { 165 struct in_multi **imo_membership; /* group memberships */ 166 unsigned short imo_ifidx; /* ifp index for outgoing multicasts */ 167 u_int8_t imo_ttl; /* TTL for outgoing multicasts */ 168 u_int8_t imo_loop; /* 1 => hear sends if a member */ 169 u_int16_t imo_num_memberships; /* no. memberships this socket */ 170 u_int16_t imo_max_memberships; /* max memberships this socket */ 171}; 172 173#include <sys/queue.h> 174 175/* 176 * Ip reassembly queue structures. 177 */ 178LIST_HEAD(ipqehead, ipqent); 179struct ipqent { 180 LIST_ENTRY(ipqent) ipqe_q; 181 struct ip *ipqe_ip; 182 struct mbuf *ipqe_m; /* mbuf contains packet */ 183 uint16_t ipqe_mff; /* for IP fragmentation */ 184}; 185 186/* 187 * Ip reassembly queue structure. Each fragment 188 * being reassembled is attached to one of these structures. 189 * They are timed out after ipq_ttl drops to 0, and may also 190 * be reclaimed if memory becomes tight. 191 */ 192struct ipq { 193 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 194 u_int8_t ipq_ttl; /* time for reass q to live */ 195 u_int8_t ipq_p; /* protocol of this fragment */ 196 u_int16_t ipq_id; /* sequence id for reassembly */ 197 struct ipqehead ipq_fragq; /* to ip fragment queue */ 198 struct in_addr ipq_src, ipq_dst; 199}; 200 201struct ipoffnxt { 202 int ion_off; 203 int ion_nxt; 204}; 205 206/* flags passed to ip_output */ 207#define IP_FORWARDING 0x0001 /* most of ip header exists */ 208#define IP_RAWOUTPUT 0x0002 /* raw ip header exists */ 209#define IP_REDIRECT 0x0004 /* redirected by pf or source route */ 210#define IP_FORWARDING_IPSEC 0x0008 /* only packets processed by IPsec */ 211#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 212#define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */ 213 214extern struct ipstat ipstat; 215extern int ip_defttl; /* default IP ttl */ 216 217#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 218 219extern int ip_mtudisc; /* mtu discovery */ 220extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 221 222extern int ipport_firstauto; /* min port for port allocation */ 223extern int ipport_lastauto; /* max port for port allocation */ 224extern int ipport_hifirstauto; /* min dynamic/private port number */ 225extern int ipport_hilastauto; /* max dynamic/private port number */ 226extern int ip_forwarding; /* enable IP forwarding */ 227#ifdef MROUTING 228extern int ipmforwarding; /* enable multicast forwarding */ 229#endif 230extern int ipmultipath; /* enable multipath routing */ 231extern int ip_directedbcast; /* accept all broadcast packets */ 232extern unsigned int la_hold_total; 233 234extern const struct pr_usrreqs rip_usrreqs; 235 236extern struct rttimer_queue ip_mtudisc_timeout_q; 237extern struct pool ipqent_pool; 238struct rtentry; 239struct route; 240struct inpcb; 241struct ipsec_level; 242 243int ip_ctloutput(int, struct socket *, int, int, struct mbuf *); 244int ip_fragment(struct mbuf *, struct mbuf_list *, struct ifnet *, u_long); 245void ip_freemoptions(struct ip_moptions *); 246int ip_getmoptions(int, struct ip_moptions *, struct mbuf *); 247void ip_init(void); 248struct mbuf* 249 ip_insertoptions(struct mbuf *, struct mbuf *, int *); 250int ip_mforward(struct mbuf *, struct ifnet *, int); 251int ip_optcopy(struct ip *, struct ip *); 252int ip_output(struct mbuf *, struct mbuf *, struct route *, int, 253 struct ip_moptions *, const struct ipsec_level *, u_int32_t); 254u_int16_t 255 ip_randomid(void); 256void ip_send(struct mbuf *); 257void ip_send_raw(struct mbuf *); 258void ip_slowtimo(void); 259struct mbuf * 260 ip_srcroute(struct mbuf *); 261void ip_stripoptions(struct mbuf *); 262int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 263void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 264 struct mbuf *); 265int ip_input_if(struct mbuf **, int *, int, int, struct ifnet *); 266int ip_deliver(struct mbuf **, int *, int, int, int); 267void ip_forward(struct mbuf *, struct ifnet *, struct route *, int); 268int rip_ctloutput(int, struct socket *, int, int, struct mbuf *); 269void rip_init(void); 270int rip_input(struct mbuf **, int *, int, int); 271int rip_output(struct mbuf *, struct socket *, struct sockaddr *, 272 struct mbuf *); 273struct mbuf * 274 rip_chkhdr(struct mbuf *, struct mbuf *); 275int rip_attach(struct socket *, int, int); 276int rip_detach(struct socket *); 277void rip_lock(struct socket *); 278void rip_unlock(struct socket *); 279int rip_locked(struct socket *); 280int rip_bind(struct socket *, struct mbuf *, struct proc *); 281int rip_connect(struct socket *, struct mbuf *); 282int rip_disconnect(struct socket *); 283int rip_shutdown(struct socket *); 284int rip_send(struct socket *, struct mbuf *, struct mbuf *, 285 struct mbuf *); 286#ifdef MROUTING 287extern struct socket *ip_mrouter[]; /* multicast routing daemon */ 288#endif 289 290#endif /* _KERNEL */ 291#endif /* _NETINET_IP_VAR_H_ */ 292