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| File: [OpenBSD] / src / sys / netinet / in.h (download) Revision 1.55.2.1, Tue Jun 11 03:31:36 2002 UTC (11 months, 2 weeks ago) by art Branch: UBC Changes since 1.55: +11 -11 lines Sync UBC branch to -current |
/* $OpenBSD: in.h,v 1.55.2.1 2002/06/11 03:31:36 art 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_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_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_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];
};
/*
* 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_IPCOMP + 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 }, \
}
/*
* 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 }, \
}
/* INET6 stuff */
#define __KAME_NETINET_IN_H_INCLUDED_
#include <netinet6/in6.h>
#undef __KAME_NETINET_IN_H_INCLUDED_
#ifndef _KERNEL
#include <sys/cdefs.h>
__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);
}
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 */
#endif /* _NETINET_IN_H_ */