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freebsd-dev/sys/netipsec/ipsec_support.h
Andrey V. Elsukov fcf596178b Merge projects/ipsec into head/. 
Small summary
 -------------

o Almost all IPsec releated code was moved into sys/netipsec.
o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel
  option IPSEC_SUPPORT added. It enables support for loading
  and unloading of ipsec.ko and tcpmd5.ko kernel modules.
o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by
  default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type
  support was removed. Added TCP/UDP checksum handling for
  inbound packets that were decapsulated by transport mode SAs.
  setkey(8) modified to show run-time NAT-T configuration of SA.
o New network pseudo interface if_ipsec(4) added. For now it is
  build as part of ipsec.ko module (or with IPSEC kernel).
  It implements IPsec virtual tunnels to create route-based VPNs.
o The network stack now invokes IPsec functions using special
  methods. The only one header file <netipsec/ipsec_support.h>
  should be included to declare all the needed things to work
  with IPsec.
o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed.
  Now these protocols are handled directly via IPsec methods.
o TCP_SIGNATURE support was reworked to be more close to RFC.
o PF_KEY SADB was reworked:
  - now all security associations stored in the single SPI namespace,
    and all SAs MUST have unique SPI.
  - several hash tables added to speed up lookups in SADB.
  - SADB now uses rmlock to protect access, and concurrent threads
    can do SA lookups in the same time.
  - many PF_KEY message handlers were reworked to reflect changes
    in SADB.
  - SADB_UPDATE message was extended to support new PF_KEY headers:
    SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They
    can be used by IKE daemon to change SA addresses.
o ipsecrequest and secpolicy structures were cardinally changed to
  avoid locking protection for ipsecrequest. Now we support
  only limited number (4) of bundled SAs, but they are supported
  for both INET and INET6.
o INPCB security policy cache was introduced. Each PCB now caches
  used security policies to avoid SP lookup for each packet.
o For inbound security policies added the mode, when the kernel does
  check for full history of applied IPsec transforms.
o References counting rules for security policies and security
  associations were changed. The proper SA locking added into xform
  code.
o xform code was also changed. Now it is possible to unregister xforms.
  tdb_xxx structures were changed and renamed to reflect changes in
  SADB/SPDB, and changed rules for locking and refcounting.

Reviewed by:	gnn, wblock
Obtained from:	Yandex LLC
Relnotes:	yes
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D9352
2017-02-06 08:49:57 +00:00

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/*-
* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _NETIPSEC_IPSEC_SUPPORT_H_
#define _NETIPSEC_IPSEC_SUPPORT_H_
#ifdef _KERNEL
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
struct mbuf;
struct inpcb;
struct tcphdr;
struct sockopt;
struct sockaddr;
struct ipsec_support;
struct tcpmd5_support;
size_t ipsec_hdrsiz_inpcb(struct inpcb *);
int ipsec_init_pcbpolicy(struct inpcb *);
int ipsec_delete_pcbpolicy(struct inpcb *);
int ipsec_copy_pcbpolicy(struct inpcb *, struct inpcb *);
struct ipsec_methods {
int (*input)(struct mbuf *, int, int);
int (*check_policy)(const struct mbuf *, struct inpcb *);
int (*forward)(struct mbuf *);
int (*output)(struct mbuf *, struct inpcb *);
int (*pcbctl)(struct inpcb *, struct sockopt *);
size_t (*hdrsize)(struct inpcb *);
int (*capability)(struct mbuf *, u_int);
int (*ctlinput)(int, struct sockaddr *, void *);
int (*udp_input)(struct mbuf *, int, int);
int (*udp_pcbctl)(struct inpcb *, struct sockopt *);
};
#define IPSEC_CAP_OPERABLE 1
#define IPSEC_CAP_BYPASS_FILTER 2
struct tcpmd5_methods {
int (*input)(struct mbuf *, struct tcphdr *, u_char *);
int (*output)(struct mbuf *, struct tcphdr *, u_char *);
int (*pcbctl)(struct inpcb *, struct sockopt *);
};
#define IPSEC_MODULE_ENABLED 0x0001
#define IPSEC_ENABLED(proto) \
((proto ## _ipsec_support)->enabled & IPSEC_MODULE_ENABLED)
#define TCPMD5_ENABLED() IPSEC_ENABLED(tcp)
#ifdef TCP_SIGNATURE
/* TCP-MD5 build in the kernel */
struct tcpmd5_support {
const u_int enabled;
const struct tcpmd5_methods * const methods;
};
extern const struct tcpmd5_support * const tcp_ipsec_support;
#define TCPMD5_INPUT(m, ...) \
(*tcp_ipsec_support->methods->input)(m, __VA_ARGS__)
#define TCPMD5_OUTPUT(m, ...) \
(*tcp_ipsec_support->methods->output)(m, __VA_ARGS__)
#define TCPMD5_PCBCTL(inp, sopt) \
(*tcp_ipsec_support->methods->pcbctl)(inp, sopt)
#elif defined(IPSEC_SUPPORT)
/* TCP-MD5 build as module */
struct tcpmd5_support {
volatile u_int enabled;
const struct tcpmd5_methods * volatile methods;
};
extern struct tcpmd5_support * const tcp_ipsec_support;
void tcpmd5_support_enable(const struct tcpmd5_methods * const);
void tcpmd5_support_disable(void);
int tcpmd5_kmod_pcbctl(struct tcpmd5_support * const, struct inpcb *,
struct sockopt *);
int tcpmd5_kmod_input(struct tcpmd5_support * const, struct mbuf *,
struct tcphdr *, u_char *);
int tcpmd5_kmod_output(struct tcpmd5_support * const, struct mbuf *,
struct tcphdr *, u_char *);
#define TCPMD5_INPUT(m, ...) \
tcpmd5_kmod_input(tcp_ipsec_support, m, __VA_ARGS__)
#define TCPMD5_OUTPUT(m, ...) \
tcpmd5_kmod_output(tcp_ipsec_support, m, __VA_ARGS__)
#define TCPMD5_PCBCTL(inp, sopt) \
tcpmd5_kmod_pcbctl(tcp_ipsec_support, inp, sopt)
#endif
#endif /* IPSEC || IPSEC_SUPPORT */
#if defined(IPSEC)
struct ipsec_support {
const u_int enabled;
const struct ipsec_methods * const methods;
};
extern const struct ipsec_support * const ipv4_ipsec_support;
extern const struct ipsec_support * const ipv6_ipsec_support;
#define IPSEC_INPUT(proto, m, ...) \
(*(proto ## _ipsec_support)->methods->input)(m, __VA_ARGS__)
#define IPSEC_CHECK_POLICY(proto, m, ...) \
(*(proto ## _ipsec_support)->methods->check_policy)(m, __VA_ARGS__)
#define IPSEC_FORWARD(proto, m) \
(*(proto ## _ipsec_support)->methods->forward)(m)
#define IPSEC_OUTPUT(proto, m, ...) \
(*(proto ## _ipsec_support)->methods->output)(m, __VA_ARGS__)
#define IPSEC_PCBCTL(proto, inp, sopt) \
(*(proto ## _ipsec_support)->methods->pcbctl)(inp, sopt)
#define IPSEC_CAPS(proto, m, ...) \
(*(proto ## _ipsec_support)->methods->capability)(m, __VA_ARGS__)
#define IPSEC_HDRSIZE(proto, inp) \
(*(proto ## _ipsec_support)->methods->hdrsize)(inp)
#define UDPENCAP_INPUT(m, ...) \
(*ipv4_ipsec_support->methods->udp_input)(m, __VA_ARGS__)
#define UDPENCAP_PCBCTL(inp, sopt) \
(*ipv4_ipsec_support->methods->udp_pcbctl)(inp, sopt)
#elif defined(IPSEC_SUPPORT)
struct ipsec_support {
volatile u_int enabled;
const struct ipsec_methods * volatile methods;
};
extern struct ipsec_support * const ipv4_ipsec_support;
extern struct ipsec_support * const ipv6_ipsec_support;
void ipsec_support_enable(struct ipsec_support * const,
const struct ipsec_methods * const);
void ipsec_support_disable(struct ipsec_support * const);
int ipsec_kmod_input(struct ipsec_support * const, struct mbuf *, int, int);
int ipsec_kmod_check_policy(struct ipsec_support * const, struct mbuf *,
struct inpcb *);
int ipsec_kmod_forward(struct ipsec_support * const, struct mbuf *);
int ipsec_kmod_output(struct ipsec_support * const, struct mbuf *,
struct inpcb *);
int ipsec_kmod_pcbctl(struct ipsec_support * const, struct inpcb *,
struct sockopt *);
int ipsec_kmod_capability(struct ipsec_support * const, struct mbuf *, u_int);
size_t ipsec_kmod_hdrsize(struct ipsec_support * const, struct inpcb *);
int ipsec_kmod_udp_input(struct ipsec_support * const, struct mbuf *, int, int);
int ipsec_kmod_udp_pcbctl(struct ipsec_support * const, struct inpcb *,
struct sockopt *);
#define UDPENCAP_INPUT(m, ...) \
ipsec_kmod_udp_input(ipv4_ipsec_support, m, __VA_ARGS__)
#define UDPENCAP_PCBCTL(inp, sopt) \
ipsec_kmod_udp_pcbctl(ipv4_ipsec_support, inp, sopt)
#define IPSEC_INPUT(proto, ...) \
ipsec_kmod_input(proto ## _ipsec_support, __VA_ARGS__)
#define IPSEC_CHECK_POLICY(proto, ...) \
ipsec_kmod_check_policy(proto ## _ipsec_support, __VA_ARGS__)
#define IPSEC_FORWARD(proto, ...) \
ipsec_kmod_forward(proto ## _ipsec_support, __VA_ARGS__)
#define IPSEC_OUTPUT(proto, ...) \
ipsec_kmod_output(proto ## _ipsec_support, __VA_ARGS__)
#define IPSEC_PCBCTL(proto, ...) \
ipsec_kmod_pcbctl(proto ## _ipsec_support, __VA_ARGS__)
#define IPSEC_CAPS(proto, ...) \
ipsec_kmod_capability(proto ## _ipsec_support, __VA_ARGS__)
#define IPSEC_HDRSIZE(proto, ...) \
ipsec_kmod_hdrsize(proto ## _ipsec_support, __VA_ARGS__)
#endif /* IPSEC_SUPPORT */
#endif /* _KERNEL */
#endif /* _NETIPSEC_IPSEC_SUPPORT_H_ */
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