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freebsd-dev/sys/netipsec/ipsec.h
Kornel Duleba 6b66194bcb ipsec: Check PMTU before sending a frame. 
If an encapsulated frame is going to have DF bit set check its desitnitions'
PMTU and if it won't fit drop it and:

Generate ICMP 3/4 message if the packet was to be forwarded.
Return EMSGSIZE error otherwise.

Obtained from:		Semihalf
Sponsored by:		Stormshield
Differential revision:	https://reviews.freebsd.org/D30993
2021-08-13 09:22:24 +02:00

371 lines
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/* $FreeBSD$ */
/* $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 itojun Exp $ */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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_
#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_spdcache_hits; /* SPD cache hits */
uint64_t ips_spdcache_misses; /* SPD cache misses */
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
#define IPSECCTL_MIN_PMTU 14
#ifdef _KERNEL
#include <sys/counter.h>
struct ipsec_ctx_data;
#define IPSEC_INIT_CTX(_ctx, _mp, _inp, _sav, _af, _enc) do { \
(_ctx)->mp = (_mp); \
(_ctx)->inp = (_inp); \
(_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_ipsec_dfbit);
VNET_DECLARE(int, ip4_ipsec_min_pmtu);
VNET_DECLARE(int, ip4_ipsec_ecn);
VNET_DECLARE(int, crypto_support);
VNET_DECLARE(int, async_crypto);
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_ipsec_dfbit VNET(ip4_ipsec_dfbit)
#define V_ip4_ipsec_min_pmtu VNET(ip4_ipsec_min_pmtu)
#define V_ip4_ipsec_ecn VNET(ip4_ipsec_ecn)
#define V_crypto_support VNET(crypto_support)
#define V_async_crypto VNET(async_crypto)
#define V_natt_cksum_policy VNET(natt_cksum_policy)
#define ipseclog(x) do { if (V_ipsec_debug) log x; } while (0)
/* for openbsd compatibility */
#ifdef IPSEC_DEBUG
#define IPSEC_DEBUG_DECLARE(x) x
#define DPRINTF(x) do { if (V_ipsec_debug) printf x; } while (0)
#else
#define IPSEC_DEBUG_DECLARE(x)
#define DPRINTF(x)
#endif
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 *, 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, uint32_t *, struct secasvar *);
int ipsec_updatereplay(uint32_t, struct secasvar *);
int ipsec_updateid(struct secasvar *, crypto_session_t *, crypto_session_t *);
int ipsec_initialized(void);
size_t ipsec_hdrsiz_internal(struct secpolicy *);
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_ctlinput(int, struct sockaddr *, void *);
int ipsec4_check_pmtu(struct mbuf *, struct secpolicy *, 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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