/* $OpenBSD: ip_var.h,v 1.126 2026/07/17 18:51:29 bluhm Exp $ */ /* $NetBSD: ip_var.h,v 1.16 1996/02/13 23:43:20 christos Exp $ */ /* * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip_var.h 8.1 (Berkeley) 6/10/93 */ #ifndef _NETINET_IP_VAR_H_ #define _NETINET_IP_VAR_H_ /* * Structure stored in mbuf in inpcb.ip_options * and passed to ip_output when ip options are in use. * The actual length of the options (including ipopt_dst) * is in m_len. */ #define MAX_IPOPTLEN 40 /* * Overlay for ip header used by other protocols (tcp, udp). */ struct ipovly { u_int8_t ih_x1[9]; /* (unused) */ u_int8_t ih_pr; /* protocol */ u_int16_t ih_len; /* protocol length */ struct in_addr ih_src; /* source internet address */ struct in_addr ih_dst; /* destination internet address */ }; struct ipstat { u_long ips_total; /* total packets received */ u_long ips_badsum; /* checksum bad */ u_long ips_tooshort; /* packet too short */ u_long ips_toosmall; /* not enough data */ u_long ips_badhlen; /* ip header length < data size */ u_long ips_badlen; /* ip length < ip header length */ u_long ips_fragments; /* fragments received */ u_long ips_fragdropped; /* frags dropped (dups, out of space) */ u_long ips_fragtimeout; /* fragments timed out */ u_long ips_forward; /* packets forwarded */ u_long ips_cantforward; /* packets rcvd for unreachable dest */ u_long ips_redirectsent; /* packets forwarded on same net */ u_long ips_noproto; /* unknown or unsupported protocol */ u_long ips_delivered; /* datagrams delivered to upper level*/ u_long ips_localout; /* total ip packets generated here */ u_long ips_odropped; /* lost output due to nobufs, etc. */ u_long ips_reassembled; /* total packets reassembled ok */ u_long ips_fragmented; /* datagrams successfully fragmented */ u_long ips_ofragments; /* output fragments created */ u_long ips_cantfrag; /* don't fragment flag was set, etc. */ u_long ips_badoptions; /* error in option processing */ u_long ips_noroute; /* packets discarded due to no route */ u_long ips_badvers; /* ip version != 4 */ u_long ips_rawout; /* total raw ip packets generated */ u_long ips_badfrags; /* malformed fragments (bad length) */ u_long ips_rcvmemdrop; /* frags dropped for lack of memory */ u_long ips_toolong; /* ip length > max ip packet size */ u_long ips_nogif; /* no match gif found */ u_long ips_badaddr; /* invalid address on header */ u_long ips_inswcsum; /* software checksummed on input */ u_long ips_outswcsum; /* software checksummed on output */ u_long ips_notmember; /* multicasts for unregistered groups */ u_long ips_rtcachehit; /* valid route found in cache */ u_long ips_rtcachemiss; /* route cache with new destination */ u_long ips_wrongif; /* packet received on wrong interface */ u_long ips_idropped; /* lost input due to nobufs, etc. */ }; struct ipoption { struct in_addr ipopt_dst; /* first-hop dst if source routed */ int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ }; #ifdef _KERNEL #include <sys/percpu.h> enum ipstat_counters { ips_total, /* total packets received */ ips_badsum, /* checksum bad */ ips_tooshort, /* packet too short */ ips_toosmall, /* not enough data */ ips_badhlen, /* ip header length < data size */ ips_badlen, /* ip length < ip header length */ ips_fragments, /* fragments received */ ips_fragdropped, /* frags dropped (dups, out of space) */ ips_fragtimeout, /* fragments timed out */ ips_forward, /* packets forwarded */ ips_cantforward, /* packets rcvd for unreachable dest */ ips_redirectsent, /* packets forwarded on same net */ ips_noproto, /* unknown or unsupported protocol */ ips_delivered, /* datagrams delivered to upper level*/ ips_localout, /* total ip packets generated here */ ips_odropped, /* lost output packets due to nobufs, etc. */ ips_reassembled, /* total packets reassembled ok */ ips_fragmented, /* datagrams successfully fragmented */ ips_ofragments, /* output fragments created */ ips_cantfrag, /* don't fragment flag was set, etc. */ ips_badoptions, /* error in option processing */ ips_noroute, /* packets discarded due to no route */ ips_badvers, /* ip version != 4 */ ips_rawout, /* total raw ip packets generated */ ips_badfrags, /* malformed fragments (bad length) */ ips_rcvmemdrop, /* frags dropped for lack of memory */ ips_toolong, /* ip length > max ip packet size */ ips_nogif, /* no match gif found */ ips_badaddr, /* invalid address on header */ ips_inswcsum, /* software checksummed on input */ ips_outswcsum, /* software checksummed on output */ ips_notmember, /* multicasts for unregistered groups */ ips_rtcachehit, /* valid route to destination found in cache */ ips_rtcachemiss, /* route cache filled with new destination */ ips_wrongif, /* packet received on wrong interface */ ips_idropped, /* lost input packets due to nobufs, etc. */ ips_ncounters }; extern struct cpumem *ipcounters; static inline void ipstat_inc(enum ipstat_counters c) { counters_inc(ipcounters, c); } static inline void ipstat_add(enum ipstat_counters c, uint64_t v) { counters_add(ipcounters, c, v); } /* * Structure attached to inpcb.ip_moptions and * passed to ip_output when IP multicast options are in use. */ struct ip_moptions { struct in_multi **imo_membership; /* group memberships */ unsigned short imo_ifidx; /* ifp index for outgoing multicasts */ u_int8_t imo_ttl; /* TTL for outgoing multicasts */ u_int8_t imo_loop; /* 1 => hear sends if a member */ u_int16_t imo_num_memberships; /* no. memberships this socket */ u_int16_t imo_max_memberships; /* max memberships this socket */ }; #include <sys/queue.h> /* * Ip reassembly queue structures. */ LIST_HEAD(ipqehead, ipqent); struct ipqent { LIST_ENTRY(ipqent) ipqe_q; struct ip *ipqe_ip; struct mbuf *ipqe_m; /* mbuf contains packet */ uint16_t ipqe_mff; /* for IP fragmentation */ }; /* * Ip reassembly queue structure. Each fragment * being reassembled is attached to one of these structures. * They are timed out after ipq_ttl drops to 0, and may also * be reclaimed if memory becomes tight. */ struct ipq { LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ u_int8_t ipq_ttl; /* time for reass q to live */ u_int8_t ipq_p; /* protocol of this fragment */ u_int16_t ipq_id; /* sequence id for reassembly */ struct ipqehead ipq_fragq; /* to ip fragment queue */ struct in_addr ipq_src, ipq_dst; }; struct ipoffnxt { int ion_off; int ion_nxt; }; /* flags passed to ip_output */ #define IP_FORWARDING 0x0001 /* most of ip header exists */ #define IP_RAWOUTPUT 0x0002 /* raw ip header exists */ #define IP_REDIRECT 0x0004 /* redirected by pf or source route */ #define IP_FORWARDING_IPSEC 0x0008 /* only packets processed by IPsec */ #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ #define IP_MTUDISC 0x0800 /* pmtu discovery, set DF */ extern struct ipstat ipstat; extern int ip_defttl; /* default IP ttl */ #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ extern int ip_mtudisc; /* mtu discovery */ extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ extern int ipport_firstauto; /* min port for port allocation */ extern int ipport_lastauto; /* max port for port allocation */ extern int ipport_hifirstauto; /* min dynamic/private port number */ extern int ipport_hilastauto; /* max dynamic/private port number */ extern int ip_forwarding; /* enable IP forwarding */ #ifdef MROUTING extern int ipmforwarding; /* enable multicast forwarding */ #endif extern int ipmultipath; /* enable multipath routing */ extern int ip_directedbcast; /* accept all broadcast packets */ extern unsigned int la_hold_total; extern const struct pr_usrreqs rip_usrreqs; extern struct rttimer_queue ip_mtudisc_timeout_q; extern struct pool ipqent_pool; struct rtentry; struct route; struct inpcb; struct ipsec_level; int ip_ctloutput(int, struct socket *, int, int, struct mbuf *); int ip_fragment(struct mbuf *, struct mbuf_list *, struct ifnet *, u_long); void ip_freemoptions(struct ip_moptions *); int ip_getmoptions(int, struct ip_moptions *, struct mbuf *); void ip_init(void); struct mbuf* ip_insertoptions(struct mbuf *, struct mbuf *, int *); int ip_mrouter_active(u_int); int ip_mforward(struct mbuf *, struct ifnet *, int); int ip_optcopy(struct ip *, struct ip *); int ip_output(struct mbuf *, struct mbuf *, struct route *, int, struct ip_moptions *, const struct ipsec_level *, uint32_t); void ip_randomid_init(void); u_int16_t ip_randomid(void); void ip_send(struct mbuf *); void ip_send_raw(struct mbuf *); void ip_slowtimo(void); struct mbuf * ip_srcroute(struct mbuf *); void ip_stripoptions(struct mbuf *); int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, struct mbuf *); int ip_input_if(struct mbuf **, int *, int, int, struct ifnet *, struct netstack *); int ip_deliver(struct mbuf **, int *, int, int, int, struct netstack *); void ip_forward(struct mbuf *, struct ifnet *, struct route *, int); int rip_ctloutput(int, struct socket *, int, int, struct mbuf *); void rip_init(void); int rip_input(struct mbuf **, int *, int, int, struct netstack *); int rip_output(struct mbuf *, struct socket *, struct sockaddr *, struct mbuf *); struct mbuf * rip_chkhdr(struct mbuf *, struct mbuf *); int rip_attach(struct socket *, int, int); int rip_detach(struct socket *); int rip_bind(struct socket *, struct mbuf *, struct proc *); int rip_connect(struct socket *, struct mbuf *); int rip_disconnect(struct socket *); int rip_shutdown(struct socket *); int rip_send(struct socket *, struct mbuf *, struct mbuf *, struct mbuf *); #endif /* _KERNEL */ #endif /* _NETINET_IP_VAR_H_ */
