/* $OpenBSD: in.h,v 1.63 2004/11/24 01:25:42 mcbride 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. 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_RSVP 46 /* resource reservation */ #define IPPROTO_GRE 47 /* GRE encap, RFCs 1701/1702 */ #define IPPROTO_ESP 50 /* Encap. Security Payload */ #define IPPROTO_AH 51 /* Authentication header */ #define IPPROTO_MOBILE 55 /* IP Mobility, RFC 2004 */ #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_ETHERIP 97 /* Ethernet in IPv4 */ #define IPPROTO_ENCAP 98 /* encapsulation header */ #define IPPROTO_PIM 103 /* Protocol indep. multicast */ #define IPPROTO_IPCOMP 108 /* IP Payload Comp. Protocol */ #define IPPROTO_CARP 112 /* CARP */ #define IPPROTO_PFSYNC 240 /* PFSYNC */ #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; }; /* last return value of *_input(), meaning "all job for this pkt is done". */ #define IPPROTO_DONE 257 /* * 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_ALLROUTERS_GROUP __IPADDR(0xe0000002) /* 224.0.0.2 */ #define INADDR_CARP_GROUP __IPADDR(0xe0000012) /* 224.0.0.18 */ #define INADDR_PFSYNC_GROUP __IPADDR(0xe00000f0) /* 224.0.0.240 */ #define INADDR_MAX_LOCAL_GROUP __IPADDR(0xe00000ff) /* 224.0.0.255 */ #define IN_LOOPBACKNET 127 /* official! */ /* * 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]; }; struct sockaddr_rtin { u_int8_t rtin_len; sa_family_t rtin_family; in_port_t rtin_port; struct in_addr rtin_dst; struct in_addr rtin_src; int8_t rtin_zero[4]; }; /* * 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 /* int; authentication used */ #define IP_ESP_TRANS_LEVEL 21 /* int; transport encryption */ #define IP_ESP_NETWORK_LEVEL 22 /* int; full-packet encryption */ #define IP_IPSEC_LOCAL_ID 23 /* buf; IPsec local ID */ #define IP_IPSEC_REMOTE_ID 24 /* buf; IPsec remote ID */ #define IP_IPSEC_LOCAL_CRED 25 /* buf; IPsec local credentials */ #define IP_IPSEC_REMOTE_CRED 26 /* buf; IPsec remote credentials */ #define IP_IPSEC_LOCAL_AUTH 27 /* buf; IPsec local auth material */ #define IP_IPSEC_REMOTE_AUTH 28 /* buf; IPsec remote auth material */ #define IP_IPCOMP_LEVEL 29 /* int; compression used */ /* * 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 #define IPSEC_IPCOMP_LEVEL_DEFAULT IPSEC_LEVEL_DEFAULT /* * 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 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 /* * Definitions for inet sysctl operations. * * Third level is protocol number. * Fourth level is desired variable within that protocol. */ #define IPPROTO_MAXID (IPPROTO_CARP + 1) /* don't list to IPPROTO_MAX */ #define CTL_IPPROTO_NAMES { \ { "ip", CTLTYPE_NODE }, \ { "icmp", CTLTYPE_NODE }, \ { "igmp", CTLTYPE_NODE }, \ { "ggp", CTLTYPE_NODE }, \ { "ipip", 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 }, \ { "gre", CTLTYPE_NODE }, \ { 0, 0 }, \ { 0, 0 }, \ { "esp", CTLTYPE_NODE }, \ { "ah", CTLTYPE_NODE }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { "mobileip", 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 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { "etherip", CTLTYPE_NODE }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { "ipcomp", CTLTYPE_NODE }, \ { 0, 0 }, \ { 0, 0 }, \ { 0, 0 }, \ { "carp", 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 #ifdef notdef /*obsolete*/ #define IPCTL_GIF_TTL 13 /* default TTL for gif encap packet */ #endif #define IPCTL_IPSEC_EXPIRE_ACQUIRE 14 /* How long to wait for key mgmt. */ #define IPCTL_IPSEC_EMBRYONIC_SA_TIMEOUT 15 /* new SA lifetime */ #define IPCTL_IPSEC_REQUIRE_PFS 16 #define IPCTL_IPSEC_SOFT_ALLOCATIONS 17 #define IPCTL_IPSEC_ALLOCATIONS 18 #define IPCTL_IPSEC_SOFT_BYTES 19 #define IPCTL_IPSEC_BYTES 20 #define IPCTL_IPSEC_TIMEOUT 21 #define IPCTL_IPSEC_SOFT_TIMEOUT 22 #define IPCTL_IPSEC_SOFT_FIRSTUSE 23 #define IPCTL_IPSEC_FIRSTUSE 24 #define IPCTL_IPSEC_ENC_ALGORITHM 25 #define IPCTL_IPSEC_AUTH_ALGORITHM 26 #define IPCTL_MTUDISC 27 /* allow path MTU discovery */ #define IPCTL_MTUDISCTIMEOUT 28 /* allow path MTU discovery */ #define IPCTL_IPSEC_IPCOMP_ALGORITHM 29 #define IPCTL_MAXID 30 #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 }, \ { 0, 0 }, \ { "ipsec-expire-acquire", CTLTYPE_INT }, \ { "ipsec-invalid-life", CTLTYPE_INT }, \ { "ipsec-pfs", CTLTYPE_INT }, \ { "ipsec-soft-allocs", CTLTYPE_INT }, \ { "ipsec-allocs", CTLTYPE_INT }, \ { "ipsec-soft-bytes", CTLTYPE_INT }, \ { "ipsec-bytes", CTLTYPE_INT }, \ { "ipsec-timeout", CTLTYPE_INT }, \ { "ipsec-soft-timeout", CTLTYPE_INT }, \ { "ipsec-soft-firstuse", CTLTYPE_INT }, \ { "ipsec-firstuse", CTLTYPE_INT }, \ { "ipsec-enc-alg", CTLTYPE_STRING }, \ { "ipsec-auth-alg", CTLTYPE_STRING }, \ { "mtudisc", CTLTYPE_INT }, \ { "mtudisctimeout", CTLTYPE_INT }, \ { "ipsec-comp-alg", CTLTYPE_STRING }, \ } #define IPCTL_VARS { \ NULL, \ &ipforwarding, \ &ipsendredirects, \ &ip_defttl, \ NULL, \ NULL, \ &ip_directedbcast, \ &ipport_firstauto, \ &ipport_lastauto, \ &ipport_hifirstauto, \ &ipport_hilastauto, \ &ip_maxqueue, \ &encdebug, \ NULL, \ &ipsec_expire_acquire, \ &ipsec_keep_invalid, \ &ipsec_require_pfs, \ &ipsec_soft_allocations, \ &ipsec_exp_allocations, \ &ipsec_soft_bytes, \ &ipsec_exp_bytes, \ &ipsec_exp_timeout, \ &ipsec_soft_timeout, \ &ipsec_soft_first_use, \ &ipsec_exp_first_use, \ NULL, \ NULL, \ NULL, \ NULL, \ NULL, \ } /* INET6 stuff */ #define __KAME_NETINET_IN_H_INCLUDED_ #include #undef __KAME_NETINET_IN_H_INCLUDED_ #ifndef _KERNEL #include __BEGIN_DECLS int bindresvport(int, struct sockaddr_in *); struct sockaddr; int bindresvport_sa(int, struct sockaddr *); __END_DECLS #else /* * in_cksum_phdr: * * Compute significant parts of the IPv4 checksum pseudo-header * for use in a delayed TCP/UDP checksum calculation. * * Args: * * src Source IP address * dst Destination IP address * lenproto htons(proto-hdr-len + proto-number) */ static __inline u_int16_t __attribute__((__unused__)) in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto) { u_int32_t sum; sum = lenproto + (u_int16_t)(src >> 16) + (u_int16_t)(src /*& 0xffff*/) + (u_int16_t)(dst >> 16) + (u_int16_t)(dst /*& 0xffff*/); sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/); if (sum > 0xffff) sum -= 0xffff; return (sum); } /* * in_cksum_addword: * * Add the two 16-bit network-order values, carry, and return. */ static __inline u_int16_t __attribute__((__unused__)) in_cksum_addword(u_int16_t a, u_int16_t b) { u_int32_t sum = a + b; if (sum > 0xffff) sum -= 0xffff; return (sum); } extern struct in_addr zeroin_addr; int in_broadcast(struct in_addr, struct ifnet *); int in_canforward(struct in_addr); int in_cksum(struct mbuf *, int); int in4_cksum(struct mbuf *, u_int8_t, int, int); void in_delayed_cksum(struct mbuf *); int in_localaddr(struct in_addr); void in_socktrim(struct sockaddr_in *); char *inet_ntoa(struct in_addr); #define in_hosteq(s,t) ((s).s_addr == (t).s_addr) #define in_nullhost(x) ((x).s_addr == INADDR_ANY) #define satosin(sa) ((struct sockaddr_in *)(sa)) #define sintosa(sin) ((struct sockaddr *)(sin)) #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) #endif /* _KERNEL */ #define satortin(rtin) ((struct sockaddr_rtin *)(rtin)) #endif /* _NETINET_IN_H_ */