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49324f585c
NetBSD/sys/netinet/in.h
cjs 8a449a258b Add net.inet.ip.allowsrcrt option which allows/drops all source 
routed packets. This currently defaults to `drop,' but once we
verify  that all applications that rely on determining remote IP
addresses for authentication are dropping the connection when they
see a source route option (not just disabling the source route
option), we can turn this back on and conform with the host
requirements.
1997-02-25 08:35:41 +00:00

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9.3 KiB
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/* $NetBSD: in.h,v 1.24 1997/02/25 08:35:41 cjs 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_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_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_EON 80 /* ISO cnlp */
#define IPPROTO_ENCAP 98 /* encapsulation header */
#define IPPROTO_RAW 255 /* raw IP packet */
#define IPPROTO_MAX 256
/*
* Local port number conventions:
* 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 5000
/*
* Internet address (a structure for historical reasons)
*/
struct in_addr {
u_int32_t s_addr;
};
/*
* 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 IN_LOOPBACKNET 127 /* official! */
/*
* Socket address, internet style.
*/
struct sockaddr_in {
u_int8_t sin_len;
u_int8_t sin_family;
u_int16_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 */
int8_t ip_opts[40]; /* actually variable in size */
};
/*
* 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 */
#define IP_RECVIF 20 /* bool; receive reception if w/dgram */
/*
* 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 */
};
/*
* Definitions for inet sysctl operations.
*
* Third level is protocol number.
* Fourth level is desired variable within that protocol.
*/
#define IPPROTO_MAXID (IPPROTO_IDP + 1) /* don't list to IPPROTO_MAX */
#define CTL_IPPROTO_NAMES { \
{ "ip", CTLTYPE_NODE }, \
{ "icmp", CTLTYPE_NODE }, \
{ "igmp", CTLTYPE_NODE }, \
{ "ggp", CTLTYPE_NODE }, \
{ 0, 0 }, \
{ 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 }, \
{ "idp", 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_FORWSRCRT 5 /* forward source-routed packets */
#define IPCTL_DIRECTEDBCAST 6 /* default broadcast behavior */
#define IPCTL_ALLOWSRCRT 7 /* allow/drop all source-routed pkts */
#define IPCTL_MAXID 8
#define IPCTL_NAMES { \
{ 0, 0 }, \
{ "forwarding", CTLTYPE_INT }, \
{ "redirect", CTLTYPE_INT }, \
{ "ttl", CTLTYPE_INT }, \
{ "mtu", CTLTYPE_INT }, \
{ "forwsrcrt", CTLTYPE_INT }, \
{ "directed-broadcast", CTLTYPE_INT }, \
{ "allowsrcrt", CTLTYPE_INT }, \
}
#ifdef _KERNEL
extern struct in_addr zeroin_addr;
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 *));
#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
#endif /* !_NETINET_IN_H_ */
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