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freebsd-nq/sys/netipsec/ipsec.h
Andrey V. Elsukov 93201211e9 Rename ip4_def_policy variable to def_policy. It is used by both IPv4 and 
IPv6. Initialize it only once in def_policy_init(). Remove its
initialization from key_init() and make it static.

Remove several fields from struct secpolicy:
* lock - it isn't so useful having mutex in the structure, but the only
  thing we do with it is initialization and destroying.
* state - it has only two values - DEAD and ALIVE. Instead of take a lock
  and change the state to DEAD, then take lock again in GC function and
  delete policy from the chain - keep in the chain only ALIVE policies.
* scangen - it was used in GC function to protect from sending several
  SADB_SPDEXPIRE messages for one SPD entry. Now we don't keep DEAD entries
  in the chain and there is no need to have scangen variable.

Use TAILQ to implement SPD entries chain. Use rmlock to protect access
to SPD entries chain. Protect all SP lookup with RLOCK, and use WLOCK
when we are inserting (or removing) SP entry in the chain.

Instead of using pattern "LOCK(); refcnt++; UNLOCK();", use refcount(9)
API to implement refcounting in SPD. Merge code from key_delsp() and
_key_delsp() into _key_freesp(). And use KEY_FREESP() macro in all cases
when we want to release reference or just delete SP entry.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
2014-12-24 18:34:56 +00:00

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/* $FreeBSD$ */
/* $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/keydb.h>
#ifdef _KERNEL
#include <sys/_lock.h>
#include <sys/_mutex.h>
#include <sys/_rwlock.h>
#define IPSEC_ASSERT(_c,_m) KASSERT(_c, _m)
#define IPSEC_IS_PRIVILEGED_SO(_so) \
((_so)->so_cred != NULL && \
priv_check_cred((_so)->so_cred, PRIV_NETINET_IPSEC, 0) \
== 0)
/*
* 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 below */
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 {
TAILQ_ENTRY(secpolicy) chain;
struct secpolicyindex spidx; /* selector */
struct ipsecrequest *req;
/* pointer to the ipsec request tree, */
/* if policy == IPSEC else this value == NULL.*/
u_int refcnt; /* reference count */
u_int policy; /* policy_type per pfkeyv2.h */
u_int32_t id; /* It's unique number on the system. */
/*
* 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.
*/
time_t created; /* time created the policy */
time_t 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 */
struct rwlock lock; /* to interlock updates */
};
/*
* Need recursion for when crypto callbacks happen directly,
* as in the case of software crypto. Need to look at how
* hard it is to remove this...
*/
#define IPSECREQUEST_LOCK_INIT(_isr) \
rw_init_flags(&(_isr)->lock, "ipsec request", RW_RECURSE)
#define IPSECREQUEST_LOCK(_isr) rw_rlock(&(_isr)->lock)
#define IPSECREQUEST_UNLOCK(_isr) rw_runlock(&(_isr)->lock)
#define IPSECREQUEST_WLOCK(_isr) rw_wlock(&(_isr)->lock)
#define IPSECREQUEST_WUNLOCK(_isr) rw_wunlock(&(_isr)->lock)
#define IPSECREQUEST_UPGRADE(_isr) rw_try_upgrade(&(_isr)->lock)
#define IPSECREQUEST_DOWNGRADE(_isr) rw_downgrade(&(_isr)->lock)
#define IPSECREQUEST_LOCK_DESTROY(_isr) rw_destroy(&(_isr)->lock)
#define IPSECREQUEST_LOCK_ASSERT(_isr) rw_assert(&(_isr)->lock, RA_LOCKED)
/* security policy in PCB */
struct inpcbpolicy {
struct secpolicy *sp_in;
struct secpolicy *sp_out;
int priv; /* privileged socket ? */
};
/* SP acquiring list table. */
struct secspacq {
LIST_ENTRY(secspacq) chain;
struct secpolicyindex spidx;
time_t 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
#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
/* statistics for ipsec processing */
struct ipsecstat {
uint64_t ips_in_polvio; /* input: sec policy violation */
uint64_t ips_in_nomem; /* input: no memory available */
uint64_t ips_in_inval; /* input: generic error */
uint64_t ips_out_polvio; /* output: sec policy violation */
uint64_t ips_out_nosa; /* output: SA unavailable */
uint64_t ips_out_nomem; /* output: no memory available */
uint64_t ips_out_noroute; /* output: no route available */
uint64_t ips_out_inval; /* output: generic error */
uint64_t ips_out_bundlesa; /* output: bundled SA processed */
uint64_t ips_mbcoalesced; /* mbufs coalesced during clone */
uint64_t ips_clcoalesced; /* clusters coalesced during clone */
uint64_t ips_clcopied; /* clusters copied during clone */
uint64_t ips_mbinserted; /* mbufs inserted during makespace */
/*
* Temporary statistics for performance analysis.
*/
/* See where ESP/AH/IPCOMP header land in mbuf on input */
uint64_t ips_input_front;
uint64_t ips_input_middle;
uint64_t ips_input_end;
};
/*
* Definitions for IPsec & Key sysctl operations.
*/
#define IPSECCTL_STATS 1 /* stats */
#define IPSECCTL_DEF_POLICY 2
#define IPSECCTL_DEF_ESP_TRANSLEV 3 /* int; ESP transport mode */
#define IPSECCTL_DEF_ESP_NETLEV 4 /* int; ESP tunnel mode */
#define IPSECCTL_DEF_AH_TRANSLEV 5 /* int; AH transport mode */
#define IPSECCTL_DEF_AH_NETLEV 6 /* int; AH tunnel mode */
#if 0 /* obsolete, do not reuse */
#define IPSECCTL_INBOUND_CALL_IKE 7
#endif
#define IPSECCTL_AH_CLEARTOS 8
#define IPSECCTL_AH_OFFSETMASK 9
#define IPSECCTL_DFBIT 10
#define IPSECCTL_ECN 11
#define IPSECCTL_DEBUG 12
#define IPSECCTL_ESP_RANDPAD 13
#ifdef _KERNEL
#include <sys/counter.h>
VNET_DECLARE(int, ipsec_debug);
#define V_ipsec_debug VNET(ipsec_debug)
#ifdef REGRESSION
VNET_DECLARE(int, ipsec_replay);
VNET_DECLARE(int, ipsec_integrity);
#define V_ipsec_replay VNET(ipsec_replay)
#define V_ipsec_integrity VNET(ipsec_integrity)
#endif
VNET_PCPUSTAT_DECLARE(struct ipsecstat, ipsec4stat);
VNET_DECLARE(int, ip4_esp_trans_deflev);
VNET_DECLARE(int, ip4_esp_net_deflev);
VNET_DECLARE(int, ip4_ah_trans_deflev);
VNET_DECLARE(int, ip4_ah_net_deflev);
VNET_DECLARE(int, ip4_ah_offsetmask);
VNET_DECLARE(int, ip4_ipsec_dfbit);
VNET_DECLARE(int, ip4_ipsec_ecn);
VNET_DECLARE(int, ip4_esp_randpad);
VNET_DECLARE(int, crypto_support);
#define IPSECSTAT_INC(name) \
VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1)
#define V_ip4_esp_trans_deflev VNET(ip4_esp_trans_deflev)
#define V_ip4_esp_net_deflev VNET(ip4_esp_net_deflev)
#define V_ip4_ah_trans_deflev VNET(ip4_ah_trans_deflev)
#define V_ip4_ah_net_deflev VNET(ip4_ah_net_deflev)
#define V_ip4_ah_offsetmask VNET(ip4_ah_offsetmask)
#define V_ip4_ipsec_dfbit VNET(ip4_ipsec_dfbit)
#define V_ip4_ipsec_ecn VNET(ip4_ipsec_ecn)
#define V_ip4_esp_randpad VNET(ip4_esp_randpad)
#define V_crypto_support VNET(crypto_support)
#define ipseclog(x) do { if (V_ipsec_debug) log x; } while (0)
/* for openbsd compatibility */
#define DPRINTF(x) do { if (V_ipsec_debug) printf x; } while (0)
extern struct ipsecrequest *ipsec_newisr(void);
extern void ipsec_delisr(struct ipsecrequest *);
struct tdb_ident;
extern struct secpolicy *ipsec_getpolicy(struct tdb_ident*, u_int);
struct inpcb;
extern struct secpolicy *ipsec4_checkpolicy(struct mbuf *, u_int,
int *, struct inpcb *);
extern struct secpolicy * ipsec_getpolicybyaddr(struct mbuf *, u_int, int *);
struct inpcb;
extern int ipsec_init_policy(struct socket *so, struct inpcbpolicy **);
extern int ipsec_copy_policy(struct inpcbpolicy *, struct inpcbpolicy *);
extern u_int ipsec_get_reqlevel(struct ipsecrequest *);
extern int ipsec_in_reject(struct secpolicy *, struct mbuf *);
extern int ipsec_set_policy(struct inpcb *inp, int optname,
caddr_t request, size_t len, struct ucred *cred);
extern int ipsec_get_policy(struct inpcb *inpcb, caddr_t request,
size_t len, struct mbuf **mp);
extern int ipsec_delete_pcbpolicy(struct inpcb *);
extern int ipsec4_in_reject(struct mbuf *, struct inpcb *);
struct secas;
struct tcpcb;
extern int ipsec_chkreplay(u_int32_t, struct secasvar *);
extern int ipsec_updatereplay(u_int32_t, struct secasvar *);
extern size_t ipsec_hdrsiz(struct mbuf *, u_int, struct inpcb *);
extern size_t ipsec_hdrsiz_tcp(struct tcpcb *);
union sockaddr_union;
extern char * ipsec_address(union sockaddr_union* sa);
extern const char *ipsec_logsastr(struct secasvar *);
extern void ipsec_dumpmbuf(struct mbuf *);
struct m_tag;
extern int ah4_input(struct mbuf **mp, int *offp, int proto);
extern void ah4_ctlinput(int cmd, struct sockaddr *sa, void *);
extern int esp4_input(struct mbuf **mp, int *offp, int proto);
extern void esp4_ctlinput(int cmd, struct sockaddr *sa, void *);
extern int ipcomp4_input(struct mbuf **mp, int *offp, int proto);
extern int ipsec4_common_input(struct mbuf *m, ...);
extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
int skip, int protoff);
extern int ipsec4_process_packet(struct mbuf *, struct ipsecrequest *);
extern int ipsec_process_done(struct mbuf *, struct ipsecrequest *);
extern struct mbuf *ipsec_copypkt(struct mbuf *);
extern void m_checkalignment(const char* where, struct mbuf *m0,
int off, int len);
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);
#ifdef DEV_ENC
#define ENC_BEFORE 0x0001
#define ENC_AFTER 0x0002
#define ENC_IN 0x0100
#define ENC_OUT 0x0200
extern int ipsec_filter(struct mbuf **, int, int);
extern void ipsec_bpf(struct mbuf *, struct secasvar *, int, int);
#endif
#endif /* _KERNEL */
#ifndef _KERNEL
extern caddr_t ipsec_set_policy(char *, int);
extern int ipsec_get_policylen(caddr_t);
extern char *ipsec_dump_policy(caddr_t, char *);
extern const char *ipsec_strerror(void);
#endif /* ! KERNEL */
#endif /* _NETIPSEC_IPSEC_H_ */
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