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/* $OpenBSD: encap.h,v 1.7 1997/07/11 23:37:52 provos Exp $ */
/*
* The author of this code is John Ioannidis, ji@tla.org,
* (except when noted otherwise).
*
* This code was written for BSD/OS in Athens, Greece, in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis, kermit@forthnet.gr.
*
* Copyright (C) 1995, 1996, 1997 by John Ioannidis and Angelos D. Keromytis.
*
* Permission to use, copy, and modify this software without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NEITHER AUTHOR MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
/*
* encap.h
*
* Declarations useful in the encapsulation code.
*/
/*
* Definitions for encapsulation-related phenomena.
*
* A lot of encapsulation protocols (ipip, swipe, ip_encap, ipsp, etc.)
* select their tunnel based on the destination (and sometimes the source)
* of the packet. The encap address/protocol family provides a generic
* mechanism for specifying tunnels.
*/
/*
* A tunnel is characterized by which source/destination address pairs
* (with netmasks) it is valid for (the "destination" as far as the
* routing code is concerned), and what the source (local) and destination
* (remote) endpoints of the tunnel, and the SPI, should be (the "gateway"
* as far as the routing code is concerned.
*/
struct sockaddr_encap
{
u_int8_t sen_len; /* length */
u_int8_t sen_family; /* AF_ENCAP */
u_int16_t sen_type; /* see SENT_* */
union
{
u_int8_t Data[16]; /* other stuff mapped here */
struct /* SENT_IP4 */
{
struct in_addr Src;
struct in_addr Dst;
u_int16_t Sport;
u_int16_t Dport;
u_int8_t Proto;
u_int8_t Filler[3];
} Sip4;
struct /* SENT_IPSP */
{
struct in_addr Dst;
u_int32_t Spi;
u_int8_t Sproto;
u_int8_t Filler[7];
} Sipsp;
} Sen;
};
#define PFENCAP_VERSION_0 0
#define PFENCAP_VERSION_1 1
#define sen_data Sen.Data
#define sen_ip_src Sen.Sip4.Src
#define sen_ip_dst Sen.Sip4.Dst
#define sen_proto Sen.Sip4.Proto
#define sen_sport Sen.Sip4.Sport
#define sen_dport Sen.Sip4.Dport
#define sen_ipsp_dst Sen.Sipsp.Dst
#define sen_ipsp_spi Sen.Sipsp.Spi
#define sen_ipsp_sproto Sen.Sipsp.Sproto
/*
* The "type" is really part of the address as far as the routing
* system is concerned. By using only one bit in the type field
* for each type, we sort-of make sure that different types of
* encapsulation addresses won't be matched against the wrong type.
*
*/
#define SENT_IP4 0x0001 /* data is two struct in_addr */
#define SENT_IPSP 0x0002 /* data as in IP4 plus SPI */
/*
* SENT_HDRLEN is the length of the "header"
* SENT_*_LEN are the lengths of various forms of sen_data
* SENT_*_OFF are the offsets in the sen_data array of various fields
*/
#define SENT_HDRLEN (2 * sizeof(u_int8_t) + sizeof(u_int16_t))
#define SENT_IP4_SRCOFF (0)
#define SENT_IP4_DSTOFF (sizeof (struct in_addr))
#define SENT_IP4_LEN 20
#define SENT_IPSP_LEN 20
/*
* Tunnel descriptors are setup and torn down using a socket of the
* AF_ENCAP domain. The following defines the messages that can
* be sent down that socket.
*/
struct encap_msghdr
{
u_int16_t em_msglen; /* message length */
u_int8_t em_version; /* for future expansion */
u_int8_t em_type; /* message type */
u_int32_t foo; /* Alignment to 64 bit */
union
{
/*
* This is used to set/change the attributes of an SPI. If oSrc and
* oDst are set to non-zero values, the SPI will also do IP-in-IP
* encapsulation (tunneling). If only one of them is set, an error
* is returned. Both zero implies transport mode.
*/
struct
{
u_int32_t Spi; /* SPI */
int32_t Alg; /* Algorithm to use */
struct in_addr Dst; /* Destination address */
struct in_addr Src; /* This is used to set our source
* address when the outgoing packet
* does not have a source address
* (is zero). */
struct in_addr oSrc; /* Outter header source address */
struct in_addr oDst; /* Same, for destination address */
u_int64_t Relative_Hard; /* Expire relative to creation */
u_int64_t Relative_Soft;
u_int64_t First_Use_Hard; /* Expire relative to first use */
u_int64_t First_Use_Soft;
u_int64_t Expire_Hard; /* Expire at fixed point in time */
u_int64_t Expire_Soft;
u_int64_t Bytes_Hard; /* Expire after bytes recved/sent */
u_int64_t Bytes_Soft;
u_int64_t Packets_Hard; /* Expire after packets recved/sent */
u_int64_t Packets_Soft;
int32_t TTL; /* When tunneling, what TTL to use.
* If set to IP4_SAME_TTL, the ttl
* from the encapsulated packet will
* be copied. If set to IP4_DEFAULT_TTL,
* the system default TTL will be used.
* If set to anything else, then the
* ttl used will be TTL % 256 */
u_int8_t Sproto; /* ESP or AH */
u_int8_t Foo[3]; /* Alignment */
u_int8_t Dat[1]; /* Data */
} Xfm;
/*
* For expiration notifications, the kernel fills in
* Notification_Type, Spi, Dst and Sproto.
* No direct response is expected.
*
* For SA Requests, the kernel fills in
* Notification_Type, MsgID, Seclevel, Dst, SAType, (and optionally
* Protocol, Src, Sport, Dport and UserID).
*
* The response should have the same values in all the fields
* and:
* Spi will hold the SPI for the three seclevels
* Sproto will hold the IPsec protocol used (AH/ESP)
* UserID can optionally hold the peer's UserID (if applicable)
*/
struct /* kernel->userland notifications */
{
u_int32_t Notification_Type;
u_int32_t MsgID; /* Request ID */
u_int32_t Spi;
u_int32_t SAType; /* What do we want for this SA */
struct in_addr Dst; /* Peer */
struct in_addr Src; /* Might have our local address */
u_int16_t Sport; /* Source port */
u_int16_t Dport; /* Destination port */
u_int8_t Protocol; /* Transport protocol */
u_int8_t Sproto; /* IPsec protocol */
u_int8_t Foo[2]; /* Alignment */
u_int8_t UserID[1]; /* Might be used to indicate user */
} Notify;
/* Link two SPIs */
struct
{
u_int32_t Spi; /* SPI */
u_int32_t Spi2;
struct in_addr Dst; /* Dest */
struct in_addr Dst2;
u_int8_t Sproto; /* IPsec protocol */
u_int8_t Sproto2;
u_int16_t Foo;
} Rel;
/* Enable/disable an SA for a session */
struct
{
u_int32_t Spi;
struct in_addr Dst;
struct in_addr iSrc; /* Source... */
struct in_addr iDst; /* ...and destination in inner IP */
struct in_addr iSmask; /* Source netmask */
struct in_addr iDmask; /* Destination netmask */
u_int16_t Sport; /* Source port, if applicable */
u_int16_t Dport; /* Destination port, if applicable */
u_int8_t Protocol; /* Transport mode for which protocol */
u_int8_t Sproto; /* IPsec protocol */
u_int8_t Foo[2]; /* Alignment */
} Ena;
/* For general use: (in)validate, delete (chain), reserve */
struct
{
u_int32_t Spi;
struct in_addr Dst;
u_int8_t Sproto;
u_int8_t Foo[3];
} Gen;
} Eu;
};
#define ENCAP_MSG_FIXED_LEN (2 * sizeof(u_int32_t))
#define NOTIFY_SOFT_EXPIRE 0 /* Soft expiration of SA */
#define NOTIFY_HARD_EXPIRE 1 /* Hard expiration of SA */
#define NOTIFY_REQUEST_SA 2 /* Establish an SA */
#define em_ena_spi Eu.Ena.Spi
#define em_ena_dst Eu.Ena.Dst
#define em_ena_isrc Eu.Ena.iSrc
#define em_ena_idst Eu.Ena.iDst
#define em_ena_ismask Eu.Ena.iSmask
#define em_ena_idmask Eu.Ena.iDmask
#define em_ena_sport Eu.Ena.Sport
#define em_ena_dport Eu.Ena.Dport
#define em_ena_protocol Eu.Ena.Protocol
#define em_ena_sproto Eu.Ena.Sproto
#define em_gen_spi Eu.Gen.Spi
#define em_gen_dst Eu.Gen.Dst
#define em_gen_sproto Eu.Gen.Sproto
#define em_not_type Eu.Notify.Notification_Type
#define em_not_spi Eu.Notify.Spi
#define em_not_dst Eu.Notify.Dst
#define em_not_satype Eu.Notify.SAType
#define em_not_userid Eu.Notify.UserID
#define em_not_msgid Eu.Notify.MsgID
#define em_not_sport Eu.Notify.Sport
#define em_not_dport Eu.Notify.Dport
#define em_not_protocol Eu.Notify.Protocol
#define em_not_sproto Eu.Notify.Sproto
#define em_spi Eu.Xfm.Spi
#define em_dst Eu.Xfm.Dst
#define em_src Eu.Xfm.Src
#define em_osrc Eu.Xfm.oSrc
#define em_odst Eu.Xfm.oDst
#define em_alg Eu.Xfm.Alg
#define em_dat Eu.Xfm.Dat
#define em_relative_hard Eu.Xfm.Relative_Hard
#define em_relative_soft Eu.Xfm.Relative_Soft
#define em_first_use_hard Eu.Xfm.First_Use_Hard
#define em_first_use_soft Eu.Xfm.First_Use_Soft
#define em_expire_hard Eu.Xfm.Expire_Hard
#define em_expire_soft Eu.Xfm.Expire_Soft
#define em_bytes_hard Eu.Xfm.Bytes_Hard
#define em_bytes_soft Eu.Xfm.Bytes_Soft
#define em_packets_hard Eu.Xfm.Packets_Hard
#define em_packets_soft Eu.Xfm.Packets_Soft
#define em_ttl Eu.Xfm.TTL
#define em_sproto Eu.Xfm.Sproto
#define em_rel_spi Eu.Rel.Spi
#define em_rel_spi2 Eu.Rel.Spi2
#define em_rel_dst Eu.Rel.Dst
#define em_rel_dst2 Eu.Rel.Dst2
#define em_rel_sproto Eu.Rel.Sproto
#define em_rel_sproto2 Eu.Rel.Sproto2
#define EMT_SETSPI 1 /* Set SPI properties */
#define EMT_GRPSPIS 2 /* Group SPIs */
#define EMT_DELSPI 3 /* delete an SPI */
#define EMT_DELSPICHAIN 4 /* delete an SPI chain starting from */
#define EMT_RESERVESPI 5 /* Give us an SPI */
#define EMT_ENABLESPI 6 /* Enable an SA */
#define EMT_DISABLESPI 7 /* Disable an SA */
#define EMT_NOTIFY 8 /* kernel->userland key mgmt not. */
#define EMT_VALIDATE 9 /* Make an SPI valid for use */
#define EMT_INVALIDATE 10 /* Make an SPI invalid for use */
/* Total packet lengths */
#define EMT_SETSPI_FLEN 120
#define EMT_GRPSPIS_FLEN 28
#define EMT_GENLEN 20
#define EMT_DELSPI_FLEN EMT_GENLEN
#define EMT_DELSPICHAIN_FLEN EMT_GENLEN
#define EMT_RESERVESPI_FLEN EMT_GENLEN
#define EMT_VALIDATE_FLEN EMT_GENLEN
#define EMT_INVALIDATE_FLEN EMT_GENLEN
#define EMT_NOTIFY_FLEN 40
#define EMT_ENABLESPI_FLEN 40
#define EMT_DISABLESPI_FLEN EMT_ENABLESPI_FLEN
#ifdef _KERNEL
extern struct ifaddr *encap_findgwifa(struct sockaddr *);
extern struct ifnet enc_softc;
#endif
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