/* * 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 * $Id: in.h,v 1.23 1996/11/11 04:56:09 fenner Exp $ */ #ifndef _NETINET_IN_H_ #define _NETINET_IN_H_ /* * Constants and structures defined by the internet system, * Per RFC 790, September 1981, and numerous additions. */ /* * 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 encapsulation in 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_RSVP 46 /* resource reservation */ #define IPPROTO_EON 80 /* ISO cnlp */ #define IPPROTO_ENCAP 98 /* encapsulation header */ #define IPPROTO_DIVERT 254 /* divert pseudo-protocol */ #define IPPROTO_RAW 255 /* raw IP packet */ #define IPPROTO_MAX 256 /* * 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,low}{first,last}_auto) * * 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). (IP_PORTRANGE_LOW) * Ports > IPPORT_USERRESERVED are reserved * for servers, not necessarily privileged. (IP_PORTRANGE_DEFAULT) */ #define IPPORT_RESERVED 1024 #define IPPORT_USERRESERVED 5000 /* * Default local port range to use by setting IP_PORTRANGE_HIGH */ #define IPPORT_HIFIRSTAUTO 40000 #define IPPORT_HILASTAUTO 44999 /* * Scanning for a free reserved port return a value below IPPORT_RESERVED, * but higher than IPPORT_RESERVEDSTART. Traditionally the start value was * 512, but that conflicts with some well-known-services that firewalls may * have a fit if we use. */ #define IPPORT_RESERVEDSTART 600 /* * Internet address (a structure for historical reasons) */ struct in_addr { u_long 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. */ #define IN_CLASSA(i) (((long)(i) & 0x80000000) == 0) #define IN_CLASSA_NET 0xff000000 #define IN_CLASSA_NSHIFT 24 #define IN_CLASSA_HOST 0x00ffffff #define IN_CLASSA_MAX 128 #define IN_CLASSB(i) (((long)(i) & 0xc0000000) == 0x80000000) #define IN_CLASSB_NET 0xffff0000 #define IN_CLASSB_NSHIFT 16 #define IN_CLASSB_HOST 0x0000ffff #define IN_CLASSB_MAX 65536 #define IN_CLASSC(i) (((long)(i) & 0xe0000000) == 0xc0000000) #define IN_CLASSC_NET 0xffffff00 #define IN_CLASSC_NSHIFT 8 #define IN_CLASSC_HOST 0x000000ff #define IN_CLASSD(i) (((long)(i) & 0xf0000000) == 0xe0000000) #define IN_CLASSD_NET 0xf0000000 /* These ones aren't really */ #define IN_CLASSD_NSHIFT 28 /* net and host fields, but */ #define IN_CLASSD_HOST 0x0fffffff /* routing needn't know. */ #define IN_MULTICAST(i) IN_CLASSD(i) #define IN_EXPERIMENTAL(i) (((long)(i) & 0xf0000000) == 0xf0000000) #define IN_BADCLASS(i) (((long)(i) & 0xf0000000) == 0xf0000000) #define INADDR_ANY (u_long)0x00000000 #define INADDR_LOOPBACK (u_long)0x7f000001 #define INADDR_BROADCAST (u_long)0xffffffff /* must be masked */ #ifndef KERNEL #define INADDR_NONE 0xffffffff /* -1 return */ #endif #define INADDR_UNSPEC_GROUP (u_long)0xe0000000 /* 224.0.0.0 */ #define INADDR_ALLHOSTS_GROUP (u_long)0xe0000001 /* 224.0.0.1 */ #define INADDR_ALLRTRS_GROUP (u_long)0xe0000002 /* 224.0.0.2 */ #define INADDR_MAX_LOCAL_GROUP (u_long)0xe00000ff /* 224.0.0.255 */ #define IN_LOOPBACKNET 127 /* official! */ /* * Socket address, internet style. */ struct sockaddr_in { u_char sin_len; u_char sin_family; u_short sin_port; struct in_addr sin_addr; char 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 */ char 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 /* u_char; 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_MULTICAST_VIF 14 /* set/get IP mcast virt. iface */ #define IP_RSVP_ON 15 /* enable RSVP in kernel */ #define IP_RSVP_OFF 16 /* disable RSVP in kernel */ #define IP_RSVP_VIF_ON 17 /* set RSVP per-vif socket */ #define IP_RSVP_VIF_OFF 18 /* unset RSVP per-vif socket */ #define IP_PORTRANGE 19 /* int; range to choose for unspec port */ #define IP_RECVIF 20 /* bool; receive reception if w/dgram */ #define IP_FW_ADD 50 /* add a firewall rule to chain */ #define IP_FW_DEL 51 /* delete a firewall rule from chain */ #define IP_FW_FLUSH 52 /* flush firewall rule chain */ #define IP_FW_ZERO 53 /* clear single/all firewall counter(s) */ #define IP_FW_GET 54 /* get entire firewall rule chain */ #define IP_NAT 55 /* set/get NAT opts */ /* * 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 */ /* * 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 */ /* * 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_RTEXPIRE 5 /* cloned route expiration time */ #define IPCTL_RTMINEXPIRE 6 /* min value for expiration time */ #define IPCTL_RTMAXCACHE 7 /* trigger level for dynamic expire */ #define IPCTL_SOURCEROUTE 8 /* may perform source routes */ #define IPCTL_DIRECTEDBROADCAST 9 /* may re-broadcast received packets */ #define IPCTL_INTRQMAXLEN 10 /* max length of netisr queue */ #define IPCTL_INTRQDROPS 11 /* number of netisr q drops */ #define IPCTL_MAXID 12 #define IPCTL_NAMES { \ { 0, 0 }, \ { "forwarding", CTLTYPE_INT }, \ { "redirect", CTLTYPE_INT }, \ { "ttl", CTLTYPE_INT }, \ { "mtu", CTLTYPE_INT }, \ { "rtexpire", CTLTYPE_INT }, \ { "rtminexpire", CTLTYPE_INT }, \ { "rtmaxcache", CTLTYPE_INT }, \ { "sourceroute", CTLTYPE_INT }, \ { "directed-broadcast", CTLTYPE_INT }, \ { "intr-queue-maxlen", CTLTYPE_INT }, \ { "intr-queue-drops", CTLTYPE_INT }, \ } #ifdef KERNEL struct ifnet; struct mbuf; /* forward declarations for Standard C */ 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)); char *inet_ntoa __P((struct in_addr)); /* in libkern */ /* Firewall hooks */ struct ip; typedef int ip_fw_chk_t __P((struct ip**, int, struct ifnet*, int, struct mbuf**)); typedef int ip_fw_ctl_t __P((int, struct mbuf**)); extern ip_fw_chk_t *ip_fw_chk_ptr; extern ip_fw_ctl_t *ip_fw_ctl_ptr; /* IP NAT hooks */ typedef int ip_nat_t __P((struct ip**, struct mbuf**, struct ifnet*, int)); typedef int ip_nat_ctl_t __P((int, struct mbuf**)); extern ip_nat_t *ip_nat_ptr; extern ip_nat_ctl_t *ip_nat_ctl_ptr; #define IP_NAT_IN 0x00000001 #define IP_NAT_OUT 0x00000002 #endif /* KERNEL */ #endif