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freebsd-dev/sys/netipsec/ipsec.h
Andrey V. Elsukov 22986c6740 Introduce the concept of IPsec security policies scope. 
Currently are defined three scopes: global, ifnet, and pcb.
Generic security policies that IKE daemon can add via PF_KEY interface
or an administrator creates with setkey(8) utility have GLOBAL scope.
Such policies can be applied by the kernel to outgoing packets and checked
agains inbound packets after IPsec processing.
Security policies created by if_ipsec(4) interfaces have IFNET scope.
Such policies are applied to packets that are passed through if_ipsec(4)
interface.
And security policies created by application using setsockopt()
IP_IPSEC_POLICY option have PCB scope. Such policies are applied to
packets related to specific socket. Currently there is no way to list
PCB policies via setkey(8) utility.

Modify setkey(8) and libipsec(3) to be able distinguish the scope of
security policies in the `setkey -DP` listing. Add two optional flags:
'-t' to list only policies related to virtual *tunneling* interfaces,
i.e. policies with IFNET scope, and '-g' to list only policies with GLOBAL
scope. By default policies from all scopes are listed.

To implement this PF_KEY's sadb_x_policy structure was modified.
sadb_x_policy_reserved field is used to pass the policy scope from the
kernel to userland. SADB_SPDDUMP message extended to support filtering
by scope: sadb_msg_satype field is used to specify bit mask of requested
scopes.

For IFNET policies the sadb_x_policy_priority field of struct sadb_x_policy
is used to pass if_ipsec's interface if_index to the userland. For GLOBAL
policies sadb_x_policy_priority is used only to manage order of security
policies in the SPDB. For IFNET policies it is not used, so it can be used
to keep if_index.

After this change the output of `setkey -DP` now looks like:
# setkey -DPt
0.0.0.0/0[any] 0.0.0.0/0[any] any
	in ipsec
	esp/tunnel/87.250.242.144-87.250.242.145/unique:145
	spid=7 seq=3 pid=58025 scope=ifnet ifname=ipsec0
	refcnt=1
# setkey -DPg
::/0 ::/0 icmp6 135,0
	out none
	spid=5 seq=1 pid=872 scope=global
	refcnt=1

No objection from:	#network
Obtained from:	Yandex LLC
MFC after:	2 weeks
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D9805
2017-03-07 00:13:53 +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)
/*
* 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 {
union sockaddr_union src; /* IP src address for SP */
union sockaddr_union dst; /* IP dst address for SP */
uint8_t ul_proto; /* upper layer Protocol */
uint8_t dir; /* direction of packet flow */
uint8_t prefs; /* prefix length in bits for src */
uint8_t prefd; /* prefix length in bits for dst */
};
/* Request for IPsec */
struct ipsecrequest {
struct secasindex saidx;/* hint for search proper SA */
/* if __ss_len == 0 then no address specified.*/
u_int level; /* IPsec level defined below. */
};
/* Security Policy Data Base */
struct secpolicy {
TAILQ_ENTRY(secpolicy) chain;
LIST_ENTRY(secpolicy) idhash;
LIST_ENTRY(secpolicy) drainq;
struct secpolicyindex spidx; /* selector */
#define IPSEC_MAXREQ 4
struct ipsecrequest *req[IPSEC_MAXREQ];
u_int tcount; /* IPsec transforms count */
volatile u_int refcnt; /* reference count */
u_int policy; /* policy_type per pfkeyv2.h */
u_int state;
#define IPSEC_SPSTATE_DEAD 0
#define IPSEC_SPSTATE_LARVAL 1
#define IPSEC_SPSTATE_ALIVE 2
#define IPSEC_SPSTATE_PCB 3
#define IPSEC_SPSTATE_IFNET 4
uint32_t priority; /* priority of this policy */
uint32_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 */
};
/*
* PCB security policies.
* Application can setup private security policies for socket.
* Such policies can have IPSEC, BYPASS and ENTRUST type.
* By default, policies are set to NULL. This means that they have ENTRUST type.
* When application sets BYPASS or IPSEC type policy, the flags field
* is also updated. When flags is not set, the system could store
* used security policy into the sp_in/sp_out pointer to speed up further
* lookups.
*/
struct inpcbpolicy {
struct secpolicy *sp_in;
struct secpolicy *sp_out;
uint32_t genid;
uint16_t flags;
#define INP_INBOUND_POLICY 0x0001
#define INP_OUTBOUND_POLICY 0x0002
uint16_t hdrsz;
};
/* 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 */
/* buffer size for formatted output of ipsec address */
#define IPSEC_ADDRSTRLEN (INET6_ADDRSTRLEN + 11)
/* 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. */
/* Policy scope */
#define IPSEC_POLICYSCOPE_ANY 0x00 /* unspecified */
#define IPSEC_POLICYSCOPE_GLOBAL 0x01 /* global scope */
#define IPSEC_POLICYSCOPE_IFNET 0x02 /* if_ipsec(4) scope */
#define IPSEC_POLICYSCOPE_PCB 0x04 /* PCB scope */
/* 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>
struct ipsec_ctx_data;
#define IPSEC_INIT_CTX(_ctx, _mp, _sav, _af, _enc) do { \
(_ctx)->mp = (_mp); \
(_ctx)->sav = (_sav); \
(_ctx)->af = (_af); \
(_ctx)->enc = (_enc); \
} while(0)
int ipsec_run_hhooks(struct ipsec_ctx_data *ctx, int direction);
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);
VNET_DECLARE(int, natt_cksum_policy);
#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 V_natt_cksum_policy VNET(natt_cksum_policy)
#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)
struct inpcb;
struct m_tag;
struct secasvar;
struct sockopt;
struct tcphdr;
union sockaddr_union;
int ipsec_if_input(struct mbuf *, struct secasvar *, uint32_t);
struct ipsecrequest *ipsec_newisr(void);
void ipsec_delisr(struct ipsecrequest *);
struct secpolicy *ipsec4_checkpolicy(const struct mbuf *, struct inpcb *,
int *);
u_int ipsec_get_reqlevel(struct secpolicy *, u_int);
void udp_ipsec_adjust_cksum(struct mbuf *, struct secasvar *, int, int);
int udp_ipsec_output(struct mbuf *, struct secasvar *);
int udp_ipsec_input(struct mbuf *, int, int);
int udp_ipsec_pcbctl(struct inpcb *, struct sockopt *);
int ipsec_chkreplay(uint32_t, struct secasvar *);
int ipsec_updatereplay(uint32_t, struct secasvar *);
int ipsec_updateid(struct secasvar *, uint64_t *, uint64_t *);
int ipsec_initialized(void);
void ipsec_setspidx_inpcb(struct inpcb *, struct secpolicyindex *, u_int);
void ipsec4_setsockaddrs(const struct mbuf *, union sockaddr_union *,
union sockaddr_union *);
int ipsec4_in_reject(const struct mbuf *, struct inpcb *);
int ipsec4_input(struct mbuf *, int, int);
int ipsec4_forward(struct mbuf *);
int ipsec4_pcbctl(struct inpcb *, struct sockopt *);
int ipsec4_output(struct mbuf *, struct inpcb *);
int ipsec4_capability(struct mbuf *, u_int);
int ipsec4_common_input_cb(struct mbuf *, struct secasvar *, int, int);
int ipsec4_process_packet(struct mbuf *, struct secpolicy *, struct inpcb *);
int ipsec_process_done(struct mbuf *, struct secpolicy *, struct secasvar *,
u_int);
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);
#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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