NetBSD/sys/netipsec/ipsec.h

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2006-10-14 00:53:59 +04:00
/* $NetBSD: ipsec.h,v 1.16 2006/10/13 20:53:59 christos Exp $ */
Initial commit of a port of the FreeBSD implementation of RFC 2385 (MD5 signatures for TCP, as used with BGP). Credit for original FreeBSD code goes to Bruce M. Simpson, with FreeBSD sponsorship credited to sentex.net. Shortening of the setsockopt() name attributed to Vincent Jardin. This commit is a minimal, working version of the FreeBSD code, as MFC'ed to FreeBSD-4. It has received minimal testing with a ttcp modified to set the TCP-MD5 option; BMS's additions to tcpdump-current (tcpdump -M) confirm that the MD5 signatures are correct. Committed as-is for further testing between a NetBSD BGP speaker (e.g., quagga) and industry-standard BGP speakers (e.g., Cisco, Juniper). NOTE: This version has two potential flaws. First, I do see any code that verifies recieved TCP-MD5 signatures. Second, the TCP-MD5 options are internally padded and assumed to be 32-bit aligned. A more space-efficient scheme is to pack all TCP options densely (and possibly unaligned) into the TCP header ; then do one final padding to a 4-byte boundary. Pre-existing comments note that accounting for TCP-option space when we add SACK is yet to be done. For now, I'm punting on that; we can solve it properly, in a way that will handle SACK blocks, as a separate exercise. In case a pullup to NetBSD-2 is requested, this adds sys/netipsec/xform_tcp.c ,and modifies: sys/net/pfkeyv2.h,v 1.15 sys/netinet/files.netinet,v 1.5 sys/netinet/ip.h,v 1.25 sys/netinet/tcp.h,v 1.15 sys/netinet/tcp_input.c,v 1.200 sys/netinet/tcp_output.c,v 1.109 sys/netinet/tcp_subr.c,v 1.165 sys/netinet/tcp_usrreq.c,v 1.89 sys/netinet/tcp_var.h,v 1.109 sys/netipsec/files.netipsec,v 1.3 sys/netipsec/ipsec.c,v 1.11 sys/netipsec/ipsec.h,v 1.7 sys/netipsec/key.c,v 1.11 share/man/man4/tcp.4,v 1.16 lib/libipsec/pfkey.c,v 1.20 lib/libipsec/pfkey_dump.c,v 1.17 lib/libipsec/policy_token.l,v 1.8 sbin/setkey/parse.y,v 1.14 sbin/setkey/setkey.8,v 1.27 sbin/setkey/token.l,v 1.15 Note that the preceding two revisions to tcp.4 will be required to cleanly apply this diff.
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/* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/ipsec.h,v 1.2.4.2 2004/02/14 22:23:23 bms Exp $ */
/* $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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.
*/
/*
* IPsec controller part.
*/
#ifndef _NETIPSEC_IPSEC_H_
#define _NETIPSEC_IPSEC_H_
#if defined(_KERNEL) && !defined(_LKM) && !defined(KLD_MODULE)
#include "opt_inet.h"
#include "opt_ipsec.h"
#endif
#include <net/pfkeyv2.h>
#include <netipsec/ipsec_osdep.h>
#include <netipsec/keydb.h>
#ifdef _KERNEL
/*
* Security Policy Index
* Ensure that both address families in the "src" and "dst" are same.
* When the value of the ul_proto is ICMPv6, the port field in "src"
* specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code.
*/
struct secpolicyindex {
u_int8_t dir; /* direction of packet flow, see blow */
union sockaddr_union src; /* IP src address for SP */
union sockaddr_union dst; /* IP dst address for SP */
u_int8_t prefs; /* prefix length in bits for src */
u_int8_t prefd; /* prefix length in bits for dst */
u_int16_t ul_proto; /* upper layer Protocol */
#ifdef notyet
uid_t uids;
uid_t uidd;
gid_t gids;
gid_t gidd;
#endif
};
/* Security Policy Data Base */
struct secpolicy {
LIST_ENTRY(secpolicy) chain;
u_int refcnt; /* reference count */
struct secpolicyindex spidx; /* selector */
u_int32_t id; /* It's unique number on the system. */
u_int state; /* 0: dead, others: alive */
#define IPSEC_SPSTATE_DEAD 0
#define IPSEC_SPSTATE_ALIVE 1
u_int policy; /* DISCARD, NONE or IPSEC, see keyv2.h */
struct ipsecrequest *req;
/* pointer to the ipsec request tree, */
/* if policy == IPSEC else this value == NULL.*/
/*
* lifetime handler.
* the policy can be used without limitiation if both lifetime and
* validtime are zero.
* "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime.
* "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime.
*/
long created; /* time created the policy */
long lastused; /* updated every when kernel sends a packet */
long lifetime; /* duration of the lifetime of this policy */
long validtime; /* duration this policy is valid without use */
};
/* Request for IPsec */
struct ipsecrequest {
struct ipsecrequest *next;
/* pointer to next structure */
/* If NULL, it means the end of chain. */
struct secasindex saidx;/* hint for search proper SA */
/* if __ss_len == 0 then no address specified.*/
u_int level; /* IPsec level defined below. */
struct secasvar *sav; /* place holder of SA for use */
struct secpolicy *sp; /* back pointer to SP */
};
/* security policy in PCB */
struct inpcbpolicy {
struct secpolicy *sp_in;
struct secpolicy *sp_out;
int priv; /* privileged socket ? */
#ifdef __NetBSD__
/* cached policy */
struct {
struct secpolicy *cachesp;
struct secpolicyindex cacheidx;
int cachehint; /* processing requirement hint: */
#define IPSEC_PCBHINT_MAYBE 0 /* IPsec processing maybe required */
#define IPSEC_PCBHINT_YES 1 /* IPsec processing is required */
#define IPSEC_PCBHINT_NO 2 /* IPsec processing not required */
u_int cachegen; /* spdgen when cache filled */
} sp_cache[3]; /* XXX 3 == IPSEC_DIR_MAX */
int sp_cacheflags;
#define IPSEC_PCBSP_CONNECTED 1
#endif /* __NetBSD__ */
};
#ifdef __NetBSD__
#define IPSEC_PCB_SKIP_IPSEC(inpp, dir) \
((inpp)->sp_cache[(dir)].cachehint == IPSEC_PCBHINT_NO && \
(inpp)->sp_cache[(dir)].cachegen == ipsec_spdgen)
#endif /* __NetBSD__ */
/* SP acquiring list table. */
struct secspacq {
LIST_ENTRY(secspacq) chain;
struct secpolicyindex spidx;
long created; /* for lifetime */
int count; /* for lifetime */
/* XXX: here is mbuf place holder to be sent ? */
};
#endif /* _KERNEL */
/* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */
#define IPSEC_PORT_ANY 0
#define IPSEC_ULPROTO_ANY 255
#define IPSEC_PROTO_ANY 255
/* mode of security protocol */
/* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */
#define IPSEC_MODE_ANY 0 /* i.e. wildcard. */
#define IPSEC_MODE_TRANSPORT 1
#define IPSEC_MODE_TUNNEL 2
Initial commit of a port of the FreeBSD implementation of RFC 2385 (MD5 signatures for TCP, as used with BGP). Credit for original FreeBSD code goes to Bruce M. Simpson, with FreeBSD sponsorship credited to sentex.net. Shortening of the setsockopt() name attributed to Vincent Jardin. This commit is a minimal, working version of the FreeBSD code, as MFC'ed to FreeBSD-4. It has received minimal testing with a ttcp modified to set the TCP-MD5 option; BMS's additions to tcpdump-current (tcpdump -M) confirm that the MD5 signatures are correct. Committed as-is for further testing between a NetBSD BGP speaker (e.g., quagga) and industry-standard BGP speakers (e.g., Cisco, Juniper). NOTE: This version has two potential flaws. First, I do see any code that verifies recieved TCP-MD5 signatures. Second, the TCP-MD5 options are internally padded and assumed to be 32-bit aligned. A more space-efficient scheme is to pack all TCP options densely (and possibly unaligned) into the TCP header ; then do one final padding to a 4-byte boundary. Pre-existing comments note that accounting for TCP-option space when we add SACK is yet to be done. For now, I'm punting on that; we can solve it properly, in a way that will handle SACK blocks, as a separate exercise. In case a pullup to NetBSD-2 is requested, this adds sys/netipsec/xform_tcp.c ,and modifies: sys/net/pfkeyv2.h,v 1.15 sys/netinet/files.netinet,v 1.5 sys/netinet/ip.h,v 1.25 sys/netinet/tcp.h,v 1.15 sys/netinet/tcp_input.c,v 1.200 sys/netinet/tcp_output.c,v 1.109 sys/netinet/tcp_subr.c,v 1.165 sys/netinet/tcp_usrreq.c,v 1.89 sys/netinet/tcp_var.h,v 1.109 sys/netipsec/files.netipsec,v 1.3 sys/netipsec/ipsec.c,v 1.11 sys/netipsec/ipsec.h,v 1.7 sys/netipsec/key.c,v 1.11 share/man/man4/tcp.4,v 1.16 lib/libipsec/pfkey.c,v 1.20 lib/libipsec/pfkey_dump.c,v 1.17 lib/libipsec/policy_token.l,v 1.8 sbin/setkey/parse.y,v 1.14 sbin/setkey/setkey.8,v 1.27 sbin/setkey/token.l,v 1.15 Note that the preceding two revisions to tcp.4 will be required to cleanly apply this diff.
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#define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */
/*
* Direction of security policy.
* NOTE: Since INVALID is used just as flag.
* The other are used for loop counter too.
*/
#define IPSEC_DIR_ANY 0
#define IPSEC_DIR_INBOUND 1
#define IPSEC_DIR_OUTBOUND 2
#define IPSEC_DIR_MAX 3
#define IPSEC_DIR_INVALID 4
/* Policy level */
/*
* IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB,
* DISCARD, IPSEC and NONE are allowed for setkey() in SPD.
* DISCARD and NONE are allowed for system default.
*/
#define IPSEC_POLICY_DISCARD 0 /* discarding packet */
#define IPSEC_POLICY_NONE 1 /* through IPsec engine */
#define IPSEC_POLICY_IPSEC 2 /* do IPsec */
#define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */
#define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */
/* Security protocol level */
#define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */
#define IPSEC_LEVEL_USE 1 /* use SA if present. */
#define IPSEC_LEVEL_REQUIRE 2 /* require SA. */
#define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */
#define IPSEC_MANUAL_REQID_MAX 0x3fff
/*
* if security policy level == unique, this id
* indicate to a relative SA for use, else is
* zero.
* 1 - 0x3fff are reserved for manual keying.
* 0 are reserved for above reason. Others is
* for kernel use.
* Note that this id doesn't identify SA
* by only itself.
*/
#define IPSEC_REPLAYWSIZE 32
#ifdef _KERNEL
struct ipsec_output_state {
struct mbuf *m;
struct route *ro;
struct sockaddr *dst;
};
struct ipsec_history {
int ih_proto;
u_int32_t ih_spi;
};
extern int ipsec_debug;
#ifdef IPSEC_DEBUG
extern int ipsec_replay;
extern int ipsec_integrity;
#endif
extern struct newipsecstat newipsecstat;
extern struct secpolicy ip4_def_policy;
extern int ip4_esp_trans_deflev;
extern int ip4_esp_net_deflev;
extern int ip4_ah_trans_deflev;
extern int ip4_ah_net_deflev;
extern int ip4_ah_cleartos;
extern int ip4_ah_offsetmask;
extern int ip4_ipsec_dfbit;
extern int ip4_ipsec_ecn;
extern int ip4_esp_randpad;
extern int crypto_support;
#define ipseclog(x) do { if (ipsec_debug) log x; } while (0)
/* for openbsd compatibility */
#define DPRINTF(x) do { if (ipsec_debug) printf x; } while (0)
#ifdef __NetBSD__
extern void ipsec_pcbconn __P((struct inpcbpolicy *));
extern void ipsec_pcbdisconn __P((struct inpcbpolicy *));
extern void ipsec_invalpcbcacheall __P((void));
extern u_int ipsec_spdgen;
#endif /* __NetBSD__ */
struct tdb_ident;
extern struct secpolicy *ipsec_getpolicy __P((struct tdb_ident*, u_int));
struct inpcb;
extern struct secpolicy *ipsec4_checkpolicy __P((struct mbuf *, u_int, u_int,
int *, struct inpcb *));
extern struct secpolicy * ipsec_getpolicybyaddr(struct mbuf *, u_int,
int, int *);
static __inline struct secpolicy*
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ipsec4_getpolicybysock(
struct mbuf *m __unused,
u_int dir __unused,
const struct socket *so __unused,
int *err __unused
)
{
panic("ipsec4_getpolicybysock");
}
static __inline int
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ipsec_copy_pcbpolicy(
struct inpcbpolicy *old __unused,
struct inpcbpolicy *new __unused
)
{
/*XXX do nothing */
return (0);
}
struct inpcb;
#define ipsec_init_pcbpolicy ipsec_init_policy
extern int ipsec_init_policy __P((struct socket *so, struct inpcbpolicy **));
extern int ipsec_copy_policy
__P((struct inpcbpolicy *, struct inpcbpolicy *));
extern u_int ipsec_get_reqlevel __P((struct ipsecrequest *));
extern int ipsec_in_reject __P((struct secpolicy *, struct mbuf *));
extern int ipsec4_set_policy __P((struct inpcb *inp, int optname,
caddr_t request, size_t len, int priv));
extern int ipsec4_get_policy __P((struct inpcb *inpcb, caddr_t request,
size_t len, struct mbuf **mp));
extern int ipsec4_delete_pcbpolicy __P((struct inpcb *));
extern int ipsec4_in_reject __P((struct mbuf *, struct inpcb *));
/*
* KAME ipsec4_in_reject_so(struct mbuf*, struct so) compatibility shim
*/
#define ipsec4_in_reject_so(m, _so) \
ipsec4_in_reject(m, ((_so) == NULL? NULL : sotoinpcb(_so)))
struct secas;
struct tcpcb;
extern int ipsec_chkreplay __P((u_int32_t, struct secasvar *));
extern int ipsec_updatereplay __P((u_int32_t, struct secasvar *));
extern size_t ipsec4_hdrsiz __P((struct mbuf *, u_int, struct inpcb *));
#ifdef __FreeBSD__
extern size_t ipsec_hdrsiz_tcp __P((struct tcpcb *));
#else
extern size_t ipsec4_hdrsiz_tcp __P((struct tcpcb *));
#define ipsec4_getpolicybyaddr ipsec_getpolicybyaddr
#endif
union sockaddr_union;
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extern const char *ipsec_address(union sockaddr_union* sa);
extern const char *ipsec_logsastr __P((struct secasvar *));
extern void ipsec_dumpmbuf __P((struct mbuf *));
/* NetBSD protosw ctlin entrypoint */
extern void *esp4_ctlinput __P((int, struct sockaddr *, void *));
extern void *ah4_ctlinput __P((int, struct sockaddr *, void *));
struct m_tag;
extern void ipsec4_common_input(struct mbuf *m, ...);
extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
int skip, int protoff, struct m_tag *mt);
extern int ipsec4_process_packet __P((struct mbuf *, struct ipsecrequest *,
int, int));
extern int ipsec_process_done __P((struct mbuf *, struct ipsecrequest *));
#define ipsec_indone(m) \
(m_tag_find((m), PACKET_TAG_IPSEC_IN_DONE, NULL) != NULL)
extern struct mbuf *ipsec_copypkt __P((struct mbuf *));
extern void m_checkalignment(const char* where, struct mbuf *m0,
int off, int len);
extern struct mbuf *m_clone(struct mbuf *m0);
extern struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off);
extern caddr_t m_pad(struct mbuf *m, int n);
extern int m_striphdr(struct mbuf *m, int skip, int hlen);
/* Per-socket caching of IPsec output policy */
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static __inline
int ipsec_clear_socket_cache(struct mbuf *m __unused)
{
return 0;
}
#endif /* _KERNEL */
#ifndef _KERNEL
extern caddr_t ipsec_set_policy __P((char *, int));
extern int ipsec_get_policylen __P((caddr_t));
extern char *ipsec_dump_policy __P((caddr_t, char *));
extern const char *ipsec_strerror __P((void));
#endif /* !_KERNEL */
#ifdef _KERNEL
/* External declarations of per-file init functions */
INITFN void ah_attach(void);
INITFN void esp_attach(void);
INITFN void ipcomp_attach(void);
INITFN void ipe4_attach(void);
Initial commit of a port of the FreeBSD implementation of RFC 2385 (MD5 signatures for TCP, as used with BGP). Credit for original FreeBSD code goes to Bruce M. Simpson, with FreeBSD sponsorship credited to sentex.net. Shortening of the setsockopt() name attributed to Vincent Jardin. This commit is a minimal, working version of the FreeBSD code, as MFC'ed to FreeBSD-4. It has received minimal testing with a ttcp modified to set the TCP-MD5 option; BMS's additions to tcpdump-current (tcpdump -M) confirm that the MD5 signatures are correct. Committed as-is for further testing between a NetBSD BGP speaker (e.g., quagga) and industry-standard BGP speakers (e.g., Cisco, Juniper). NOTE: This version has two potential flaws. First, I do see any code that verifies recieved TCP-MD5 signatures. Second, the TCP-MD5 options are internally padded and assumed to be 32-bit aligned. A more space-efficient scheme is to pack all TCP options densely (and possibly unaligned) into the TCP header ; then do one final padding to a 4-byte boundary. Pre-existing comments note that accounting for TCP-option space when we add SACK is yet to be done. For now, I'm punting on that; we can solve it properly, in a way that will handle SACK blocks, as a separate exercise. In case a pullup to NetBSD-2 is requested, this adds sys/netipsec/xform_tcp.c ,and modifies: sys/net/pfkeyv2.h,v 1.15 sys/netinet/files.netinet,v 1.5 sys/netinet/ip.h,v 1.25 sys/netinet/tcp.h,v 1.15 sys/netinet/tcp_input.c,v 1.200 sys/netinet/tcp_output.c,v 1.109 sys/netinet/tcp_subr.c,v 1.165 sys/netinet/tcp_usrreq.c,v 1.89 sys/netinet/tcp_var.h,v 1.109 sys/netipsec/files.netipsec,v 1.3 sys/netipsec/ipsec.c,v 1.11 sys/netipsec/ipsec.h,v 1.7 sys/netipsec/key.c,v 1.11 share/man/man4/tcp.4,v 1.16 lib/libipsec/pfkey.c,v 1.20 lib/libipsec/pfkey_dump.c,v 1.17 lib/libipsec/policy_token.l,v 1.8 sbin/setkey/parse.y,v 1.14 sbin/setkey/setkey.8,v 1.27 sbin/setkey/token.l,v 1.15 Note that the preceding two revisions to tcp.4 will be required to cleanly apply this diff.
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INITFN void ipe4_attach(void);
INITFN void tcpsignature_attach(void);
INITFN void ipsec_attach(void);
#endif /* _KERNEL */
#endif /* !_NETIPSEC_IPSEC_H_ */