/* $OpenBSD: in.h,v 1.23 1999/04/11 19:41:36 niklas Exp $ */ /* $NetBSD: in.h,v 1.20 1996/02/13 23:41:47 christos Exp $ */ /* * Copyright (c) 1982, 1986, 1990, 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. * * @(#)in.h 8.3 (Berkeley) 1/3/94 */ /* * Constants and structures defined by the internet system, * Per RFC 790, September 1981, and numerous additions. */ #ifndef _NETINET_IN_H_ #define _NETINET_IN_H_ /* * Protocols */ #define IPPROTO_IP 0 /* dummy for IP */ #define IPPROTO_HOPOPTS IPPROTO_IP /* Hop-by-hop option header. */ #define IPPROTO_ICMP 1 /* control message protocol */ #define IPPROTO_IGMP 2 /* group mgmt protocol */ #define IPPROTO_GGP 3 /* gateway^2 (deprecated) */ #define IPPROTO_IPIP 4 /* IP inside IP */ #define IPPROTO_IPV4 IPPROTO_IPIP /* IP inside IP */ #define IPPROTO_TCP 6 /* tcp */ #define IPPROTO_EGP 8 /* exterior gateway protocol */ #define IPPROTO_PUP 12 /* pup */ #define IPPROTO_UDP 17 /* user datagram protocol */ #define IPPROTO_IDP 22 /* xns idp */ #define IPPROTO_TP 29 /* tp-4 w/ class negotiation */ #define IPPROTO_IPV6 41 /* IPv6 in IPv6 */ #define IPPROTO_ROUTING 43 /* Routing header. */ #define IPPROTO_FRAGMENT 44 /* Fragmentation/reassembly header. */ #define IPPROTO_ESP 50 /* Encap. Security Payload */ #define IPPROTO_AH 51 /* Authentication header */ #define IPPROTO_ICMPV6 58 /* ICMP for IPv6 */ #define IPPROTO_NONE 59 /* No next header */ #define IPPROTO_DSTOPTS 60 /* Destination options header. */ #define IPPROTO_EON 80 /* ISO cnlp */ #define IPPROTO_ENCAP 98 /* encapsulation header */ #define IPPROTO_RAW 255 /* raw IP packet */ #define IPPROTO_MAX 256 /* * From FreeBSD: * * Local port number conventions: * * When a user does a bind(2) or connect(2) with a port number of zero, * a non-conflicting local port address is chosen. * The default range is IPPORT_RESERVED through * IPPORT_USERRESERVED, although that is settable by sysctl. * * A user may set the IPPROTO_IP option IP_PORTRANGE to change this * default assignment range. * * The value IP_PORTRANGE_DEFAULT causes the default behavior. * * The value IP_PORTRANGE_HIGH changes the range of candidate port numbers * into the "high" range. These are reserved for client outbound connections * which do not want to be filtered by any firewalls. * * The value IP_PORTRANGE_LOW changes the range to the "low" are * that is (by convention) restricted to privileged processes. This * convention is based on "vouchsafe" principles only. It is only secure * if you trust the remote host to restrict these ports. * * The default range of ports and the high range can be changed by * sysctl(3). (net.inet.ip.port{hi}{first,last}) * * Changing those values has bad security implications if you are * using a a stateless firewall that is allowing packets outside of that * range in order to allow transparent outgoing connections. * * Such a firewall configuration will generally depend on the use of these * default values. If you change them, you may find your Security * Administrator looking for you with a heavy object. */ /* * Ports < IPPORT_RESERVED are reserved for * privileged processes (e.g. root). * Ports > IPPORT_USERRESERVED are reserved * for servers, not necessarily privileged. */ #define IPPORT_RESERVED 1024 #define IPPORT_USERRESERVED 49151 /* * Default local port range to use by setting IP_PORTRANGE_HIGH */ #define IPPORT_HIFIRSTAUTO 49152 #define IPPORT_HILASTAUTO 65535 /* * IP Version 4 Internet address (a structure for historical reasons) */ struct in_addr { in_addr_t s_addr; }; /* * IP Version 6 Internet address */ struct in6_addr { union { u_int8_t s6u_addr8[16]; u_int16_t s6u_addr16[8]; u_int32_t s6u_addr32[4]; } s6_u; #define s6_addr s6_u.s6u_addr8 /* * The rest are common, but not guaranteed to be portable. 64 bit access are * not available because the in6_addr in a sockaddr_in6 is not 64 bit aligned. */ #define s6_addr8 s6_u.s6u_addr8 #define s6_addr16 s6_u.s6u_addr16 #define s6_addr32 s6_u.s6u_addr32 }; /* * Definitions of bits in internet address integers. * On subnets, the decomposition of addresses to host and net parts * is done according to subnet mask, not the masks here. * * By byte-swapping the constants, we avoid ever having to byte-swap IP * addresses inside the kernel. Unfortunately, user-level programs rely * on these macros not doing byte-swapping. */ #ifdef _KERNEL #define __IPADDR(x) ((u_int32_t) htonl((u_int32_t)(x))) #else #define __IPADDR(x) ((u_int32_t)(x)) #endif #define IN_CLASSA(i) (((u_int32_t)(i) & __IPADDR(0x80000000)) == \ __IPADDR(0x00000000)) #define IN_CLASSA_NET __IPADDR(0xff000000) #define IN_CLASSA_NSHIFT 24 #define IN_CLASSA_HOST __IPADDR(0x00ffffff) #define IN_CLASSA_MAX 128 #define IN_CLASSB(i) (((u_int32_t)(i) & __IPADDR(0xc0000000)) == \ __IPADDR(0x80000000)) #define IN_CLASSB_NET __IPADDR(0xffff0000) #define IN_CLASSB_NSHIFT 16 #define IN_CLASSB_HOST __IPADDR(0x0000ffff) #define IN_CLASSB_MAX 65536 #define IN_CLASSC(i) (((u_int32_t)(i) & __IPADDR(0xe0000000)) == \ __IPADDR(0xc0000000)) #define IN_CLASSC_NET __IPADDR(0xffffff00) #define IN_CLASSC_NSHIFT 8 #define IN_CLASSC_HOST __IPADDR(0x000000ff) #define IN_CLASSD(i) (((u_int32_t)(i) & __IPADDR(0xf0000000)) == \ __IPADDR(0xe0000000)) /* These ones aren't really net and host fields, but routing needn't know. */ #define IN_CLASSD_NET __IPADDR(0xf0000000) #define IN_CLASSD_NSHIFT 28 #define IN_CLASSD_HOST __IPADDR(0x0fffffff) #define IN_MULTICAST(i) IN_CLASSD(i) #define IN_EXPERIMENTAL(i) (((u_int32_t)(i) & __IPADDR(0xf0000000)) == \ __IPADDR(0xf0000000)) #define IN_BADCLASS(i) (((u_int32_t)(i) & __IPADDR(0xf0000000)) == \ __IPADDR(0xf0000000)) #define IN_LOCAL_GROUP(i) (((u_int32_t)(i) & __IPADDR(0xffffff00)) == \ __IPADDR(0xe0000000)) #define INADDR_ANY __IPADDR(0x00000000) #define INADDR_LOOPBACK __IPADDR(0x7f000001) #define INADDR_BROADCAST __IPADDR(0xffffffff) /* must be masked */ #ifndef _KERNEL #define INADDR_NONE __IPADDR(0xffffffff) /* -1 return */ #endif #define INADDR_UNSPEC_GROUP __IPADDR(0xe0000000) /* 224.0.0.0 */ #define INADDR_ALLHOSTS_GROUP __IPADDR(0xe0000001) /* 224.0.0.1 */ #define INADDR_MAX_LOCAL_GROUP __IPADDR(0xe00000ff) /* 224.0.0.255 */ #define IN_LOOPBACKNET 127 /* official! */ /* * Tests for IPv6 address types */ #define IN6_IS_ADDR_LINKLOCAL(addr) \ (((addr)->s6_addr32[0] & htonl(0xffc00000)) == htonl(0xfe800000)) #define IN6_IS_ADDR_LOOPBACK(addr) \ (((addr)->s6_addr32[0] == 0) && ((addr)->s6_addr32[1] == 0) && \ ((addr)->s6_addr32[2] == 0) && ((addr)->s6_addr32[3] == htonl(1))) #define IN6_IS_ADDR_MULTICAST(addr) \ ((addr)->s6_addr8[0] == 0xff) #define IN6_IS_ADDR_SITELOCAL(addr) \ (((addr)->s6_addr32[0] & htonl(0xffc00000)) == htonl(0xfec00000)) #define IN6_IS_ADDR_UNSPECIFIED(addr) \ (((addr)->s6_addr32[0] == 0) && ((addr)->s6_addr32[1] == 0) && \ ((addr)->s6_addr32[2] == 0) && ((addr)->s6_addr32[3] == 0)) #define IN6_IS_ADDR_V4COMPAT(addr) \ (((addr)->s6_addr32[0] == 0) && ((addr)->s6_addr32[1] == 0) && \ ((addr)->s6_addr32[2] == 0) && ((addr)->s6_addr32[3] & ~htonl(1))) #define IN6_IS_ADDR_V4MAPPED(addr) \ (((addr)->s6_addr32[0] == 0) && ((addr)->s6_addr32[1] == 0) && \ ((addr)->s6_addr32[2] == htonl(0xffff))) #define IN6_ARE_ADDR_EQUAL(addr1, addr2) \ (((addr1)->s6_addr32[0] == (addr2)->s6_addr32[0]) && \ ((addr1)->s6_addr32[1] == (addr2)->s6_addr32[1]) && \ ((addr1)->s6_addr32[2] == (addr2)->s6_addr32[2]) && \ ((addr1)->s6_addr32[3] == (addr2)->s6_addr32[3])) /* * IPv6 Multicast scoping. The scope is stored * in the bottom 4 bits of the second byte of the * multicast address. */ /* 0x0 */ /* reserved */ #define IN6_NODE_LOCAL 0x1 /* node-local scope */ #define IN6_LINK_LOCAL 0x2 /* link-local scope */ /* 0x3 */ /* (unassigned) */ /* 0x4 */ /* (unassigned) */ #define IN6_SITE_LOCAL 0x5 /* site-local scope */ /* 0x6 */ /* (unassigned) */ /* 0x7 */ /* (unassigned) */ #define IN6_ORG_LOCAL 0x8 /* organization-local scope */ /* 0x9 */ /* (unassigned) */ /* 0xA */ /* (unassigned) */ /* 0xB */ /* (unassigned) */ /* 0xC */ /* (unassigned) */ /* 0xD */ /* (unassigned) */ #define IN6_GLOBAL 0xE /* global scope */ /* 0xF */ /* reserved */ #define IN6_MSCOPE(addr) ((addr)->s6_addr8[1] & 0x0f) #define IN6_IS_ADDR_MC_NODELOCAL(addr) \ (IN6_IS_ADDR_MULTICAST(addr) && (IN6_MSCOPE(addr) == IN6_NODE_LOCAL)) #define IN6_IS_ADDR_MC_LINKLOCAL(addr) \ (IN6_IS_ADDR_MULTICAST(addr) && (IN6_MSCOPE(addr) == IN6_LINK_LOCAL)) #define IN6_IS_ADDR_MC_SITELOCAL(addr) \ (IN6_IS_ADDR_MULTICAST(addr) && (IN6_MSCOPE(addr) == IN6_SITE_LOCAL)) #define IN6_IS_ADDR_MC_ORGLOCAL(addr) \ (IN6_IS_ADDR_MULTICAST(addr) && (IN6_MSCOPE(addr) == IN6_ORG_LOCAL)) #define IN6_IS_ADDR_MC_GLOBAL(addr) \ (IN6_IS_ADDR_MULTICAST(addr) && (IN6_MSCOPE(addr) == IN6_GLOBAL)) /* * Definitions of the IPv6 special addresses */ extern const struct in6_addr in6addr_any; #define IN6ADDR_ANY_INIT {{{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }}} extern const struct in6_addr in6addr_loopback; #define IN6ADDR_LOOPBACK_INIT {{{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }}} /* * IP Version 4 socket address. */ struct sockaddr_in { u_int8_t sin_len; sa_family_t sin_family; in_port_t sin_port; struct in_addr sin_addr; int8_t sin_zero[8]; }; /* * IP Version 6 socket address. */ #define SIN6_LEN 1 struct sockaddr_in6 { u_int8_t sin6_len; sa_family_t sin6_family; in_port_t sin6_port; u_int32_t sin6_flowinfo; struct in6_addr sin6_addr; u_int32_t sin6_scope_id; }; /* * Structure used to describe IP options. * Used to store options internally, to pass them to a process, * or to restore options retrieved earlier. * The ip_dst is used for the first-hop gateway when using a source route * (this gets put into the header proper). */ struct ip_opts { struct in_addr ip_dst; /* first hop, 0 w/o src rt */ #if defined(__cplusplus) int8_t Ip_opts[40]; /* cannot have same name as class */ #else int8_t ip_opts[40]; /* actually variable in size */ #endif }; /* * Options for use with [gs]etsockopt at the IP level. * First word of comment is data type; bool is stored in int. */ #define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */ #define IP_HDRINCL 2 /* int; header is included with data */ #define IP_TOS 3 /* int; IP type of service and preced. */ #define IP_TTL 4 /* int; IP time to live */ #define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */ #define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */ #define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */ #define IP_RETOPTS 8 /* ip_opts; set/get IP options */ #define IP_MULTICAST_IF 9 /* in_addr; set/get IP multicast i/f */ #define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */ #define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */ #define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */ #define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */ /* 14-17 left empty for future compatibility with FreeBSD */ #define IP_PORTRANGE 19 /* int; range to choose for unspec port */ #define IP_AUTH_LEVEL 20 /* u_char; authentication used */ #define IP_ESP_TRANS_LEVEL 21 /* u_char; transport encryption */ #define IP_ESP_NETWORK_LEVEL 22 /* u_char; full-packet encryption */ #define IPV6_MULTICAST_IF 23 /* u_int; set/get multicast interface */ #define IPV6_MULTICAST_HOPS 24 /* int; set/get multicast hop limit */ #define IPV6_MULTICAST_LOOP 25 /* u_int; set/get multicast loopback */ #define IPV6_JOIN_GROUP 26 /* ipv6_mreq; join multicast group */ #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP /* XXX - for compatibility */ #define IPV6_LEAVE_GROUP 27 /* ipv6_mreq: leave multicast group */ #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP /* XXX - for compatibility */ #define IPV6_ADDRFORM 28 /* int; get/set form of returned addrs */ #define IPV6_UNICAST_HOPS 29 /* int; get/set unicast hop limit */ #define IPV6_PKTINFO 30 /* int; receive in6_pktinfo as cmsg */ #define IPV6_HOPLIMIT 31 /* int; receive int hoplimit as cmsg */ #define IPV6_NEXTHOP 32 /* int; receive sockaddr_in6 as cmsg */ #define IPV6_HOPOPTS 33 /* int; receive hop options as cmsg */ #define IPV6_DSTOPTS 34 /* int; receive dst options as cmsg */ #define IPV6_RTHDR 35 /* int; receive routing header as cmsg */ #define IPV6_PKTOPTIONS 36 /* int; send/receive cmsgs for TCP */ #define IPV6_CHECKSUM 37 /* int; offset to place send checksum */ #define ICMPV6_FILTER 38 /* struct icmpv6_filter; get/set filter */ #define ICMP6_FILTER ICMP6_FILTER #define IPSEC_OUTSA 39 /* set the outbound SA for a socket */ /* * Security levels - IPsec, not IPSO */ #define IPSEC_LEVEL_BYPASS 0x00 /* Bypass policy altogether */ #define IPSEC_LEVEL_NONE 0x00 /* Send clear, accept any */ #define IPSEC_LEVEL_AVAIL 0x01 /* Send secure if SA available */ #define IPSEC_LEVEL_USE 0x02 /* Send secure, accept any */ #define IPSEC_LEVEL_REQUIRE 0x03 /* Require secure inbound, also use */ #define IPSEC_LEVEL_UNIQUE 0x04 /* Use outbound SA that is unique */ #define IPSEC_LEVEL_DEFAULT IPSEC_LEVEL_AVAIL #define IPSEC_AUTH_LEVEL_DEFAULT IPSEC_LEVEL_DEFAULT #define IPSEC_ESP_TRANS_LEVEL_DEFAULT IPSEC_LEVEL_DEFAULT #define IPSEC_ESP_NETWORK_LEVEL_DEFAULT IPSEC_LEVEL_DEFAULT /* * IPv6 Routing header types */ #define IPV6_RTHDR_TYPE_0 0 /* IPv6 Routing header type 0 */ #define IPV6_RTHDR_LOOSE 0 /* this hop need not be a neighbor */ #define IPV6_RTHDR_STRICT 1 /* this hop must be a neighbor */ /* * Defaults and limits for options */ #define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */ #define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */ #define IP_MAX_MEMBERSHIPS 20 /* per socket; must fit in one mbuf */ /* * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP. */ struct ip_mreq { struct in_addr imr_multiaddr; /* IP multicast address of group */ struct in_addr imr_interface; /* local IP address of interface */ }; /* * Argument structure for IPV6_ADD_MEMBERSHIP and IPV6_DROP_MEMBERSHIP. */ struct ipv6_mreq { struct in6_addr ipv6mr_multiaddr; /* IPv6 multicast addr */ unsigned int ipv6mr_interface; /* Interface index */ }; /* * Argument structure for IPV6_PKTINFO control messages */ struct in6_pktinfo { struct in6_addr ipi6_addr; unsigned int ipi6_ifindex; }; /* * Argument for IP_PORTRANGE: * - which range to search when port is unspecified at bind() or connect() */ #define IP_PORTRANGE_DEFAULT 0 /* default range */ #define IP_PORTRANGE_HIGH 1 /* "high" - request firewall bypass */ #define IP_PORTRANGE_LOW 2 /* "low" - vouchsafe security */ /* * Buffer lengths for strings containing printable IP addresses */ #define INET_ADDRSTRLEN 16 #define INET6_ADDRSTRLEN 46 /* * Definitions for inet sysctl operations. * * Third level is protocol number. * Fourth level is desired variable within that protocol. */ #define IPPROTO_MAXID (IPPROTO_AH + 1) /* don't list to IPPROTO_MAX */ #define CTL_IPPROTO_NAMES { \ { "ip", CTLTYPE_NODE }, \ { "icmp", CTLTYPE_NODE }, \ { "igmp", CTLTYPE_NODE }, \ { "ggp", CTLTYPE_NODE }, \ { "ip4", CTLTYPE_NODE }, \ { 0, 0 }, \ { "tcp", CTLTYPE_NODE }, \ { 0, 0 }, \ { "egp", CTLTYPE_NODE }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { "pup", CTLTYPE_NODE }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { "udp", CTLTYPE_NODE }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { "esp", CTLTYPE_NODE }, \ { "ah", CTLTYPE_NODE }, \ } /* * Names for IP sysctl objects */ #define IPCTL_FORWARDING 1 /* act as router */ #define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */ #define IPCTL_DEFTTL 3 /* default TTL */ #ifdef notyet #define IPCTL_DEFMTU 4 /* default MTU */ #endif #define IPCTL_SOURCEROUTE 5 /* may perform source routes */ #define IPCTL_DIRECTEDBCAST 6 /* default broadcast behavior */ #define IPCTL_IPPORT_FIRSTAUTO 7 #define IPCTL_IPPORT_LASTAUTO 8 #define IPCTL_IPPORT_HIFIRSTAUTO 9 #define IPCTL_IPPORT_HILASTAUTO 10 #define IPCTL_IPPORT_MAXQUEUE 11 #define IPCTL_ENCDEBUG 12 #define IPCTL_MAXID 13 #define IPCTL_NAMES { \ { 0, 0 }, \ { "forwarding", CTLTYPE_INT }, \ { "redirect", CTLTYPE_INT }, \ { "ttl", CTLTYPE_INT }, \ /* { "mtu", CTLTYPE_INT }, */ { 0, 0 }, \ { "sourceroute", CTLTYPE_INT }, \ { "directed-broadcast", CTLTYPE_INT }, \ { "portfirst", CTLTYPE_INT }, \ { "portlast", CTLTYPE_INT }, \ { "porthifirst", CTLTYPE_INT }, \ { "porthilast", CTLTYPE_INT }, \ { "maxqueue", CTLTYPE_INT }, \ { "encdebug", CTLTYPE_INT }, \ } #ifndef _KERNEL #include __BEGIN_DECLS int bindresvport __P((int, struct sockaddr_in *)); __END_DECLS #else int in_broadcast __P((struct in_addr, struct ifnet *)); int in_canforward __P((struct in_addr)); int in_cksum __P((struct mbuf *, int)); int in_localaddr __P((struct in_addr)); void in_socktrim __P((struct sockaddr_in *)); char *inet_ntoa __P((struct in_addr)); #define satosin(sa) ((struct sockaddr_in *)(sa)) #define sintosa(sin) ((struct sockaddr *)(sin)) #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) #endif #endif /* !_NETINET_IN_H_ */