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/* declarations of routines that interface with the kernel's IPsec mechanism
* Copyright (C) 1998-2001 D. Hugh Redelmeier.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* RCSID $Id: kernel.h 3252 2007-10-06 21:24:50Z andreas $
*/
#include "connections.h"
extern bool no_klips; /* don't actually use KLIPS */
extern bool can_do_IPcomp; /* can system actually perform IPCOMP? */
#ifdef KLIPS
/* Declare eroute things early enough for uses.
*
* Flags are encoded above the low-order byte of verbs.
* "real" eroutes are only outbound. Inbound eroutes don't exist,
* but an addflow with an INBOUND flag allows IPIP tunnels to be
* limited to appropriate source and destination addresses.
*/
#define ERO_MASK 0xFF
#define ERO_FLAG_SHIFT 8
#define ERO_DELETE SADB_X_DELFLOW
#define ERO_ADD SADB_X_ADDFLOW
#define ERO_REPLACE (SADB_X_ADDFLOW | (SADB_X_SAFLAGS_REPLACEFLOW << ERO_FLAG_SHIFT))
#define ERO_ADD_INBOUND (SADB_X_ADDFLOW | (SADB_X_SAFLAGS_INFLOW << ERO_FLAG_SHIFT))
#define ERO_DEL_INBOUND (SADB_X_DELFLOW | (SADB_X_SAFLAGS_INFLOW << ERO_FLAG_SHIFT))
struct pfkey_proto_info {
int proto;
int encapsulation;
unsigned reqid;
};
struct sadb_msg;
struct kernel_sa {
const ip_address *src;
const ip_address *dst;
const ip_subnet *src_client;
const ip_subnet *dst_client;
ipsec_spi_t spi;
unsigned proto;
unsigned satype;
unsigned transport_proto;
unsigned replay_window;
unsigned reqid;
unsigned authalg;
unsigned authkeylen;
char *authkey;
unsigned encalg;
unsigned enckeylen;
char *enckey;
unsigned compalg;
int encapsulation;
u_int16_t natt_sport, natt_dport;
u_int8_t transid, natt_type;
ip_address *natt_oa;
const char *text_said;
};
struct kernel_ops {
enum {
KERNEL_TYPE_NONE,
KERNEL_TYPE_KLIPS,
KERNEL_TYPE_LINUX,
} type;
bool inbound_eroute;
bool policy_lifetime;
int *async_fdp;
void (*init)(void);
void (*pfkey_register)(void);
void (*pfkey_register_response)(const struct sadb_msg *msg);
void (*process_queue)(void);
void (*process_msg)(void);
bool (*raw_eroute)(const ip_address *this_host,
const ip_subnet *this_client,
const ip_address *that_host,
const ip_subnet *that_client,
ipsec_spi_t spi,
unsigned int satype,
unsigned int transport_proto,
const struct pfkey_proto_info *proto_info,
time_t use_lifetime,
unsigned int op,
const char *text_said);
bool (*get_policy)(const struct kernel_sa *sa, bool inbound,
time_t *use_time);
bool (*add_sa)(const struct kernel_sa *sa, bool replace);
bool (*grp_sa)(const struct kernel_sa *sa_outer,
const struct kernel_sa *sa_inner);
bool (*del_sa)(const struct kernel_sa *sa);
bool (*get_sa)(const struct kernel_sa *sa, u_int *bytes);
ipsec_spi_t (*get_spi)(const ip_address *src,
const ip_address *dst,
int proto,
bool tunnel_mode,
unsigned reqid,
ipsec_spi_t min,
ipsec_spi_t max,
const char *text_said);
};
extern const struct kernel_ops *kernel_ops;
/* information from /proc/net/ipsec_eroute */
struct eroute_info {
unsigned long count;
ip_subnet ours;
ip_subnet his;
ip_address dst;
ip_said said;
int transport_proto;
struct eroute_info *next;
};
extern struct eroute_info *orphaned_holds;
extern void show_shunt_status(void);
#endif
/* A netlink header defines EM_MAXRELSPIS, the max number of SAs in a group.
* Is there a PF_KEY equivalent?
*/
#ifndef EM_MAXRELSPIS
# define EM_MAXRELSPIS 4 /* AH ESP IPCOMP IPIP */
#endif
extern void record_and_initiate_opportunistic(const ip_subnet *
, const ip_subnet *
, int transport_proto
, const char *why);
extern void init_kernel(void);
extern void scan_proc_shunts(void);
extern bool trap_connection(struct connection *c);
extern void unroute_connection(struct connection *c);
extern bool has_bare_hold(const ip_address *src, const ip_address *dst
, int transport_proto);
extern bool replace_bare_shunt(const ip_address *src, const ip_address *dst
, policy_prio_t policy_prio
, ipsec_spi_t shunt_spi /* in host order! */
, bool repl
, unsigned int transport_proto
, const char *why);
extern bool assign_hold(struct connection *c
, struct spd_route *sr
, int transport_proto
, const ip_address *src, const ip_address *dst);
extern ipsec_spi_t shunt_policy_spi(struct connection *c, bool prospective);
struct state; /* forward declaration of tag */
extern ipsec_spi_t get_ipsec_spi(ipsec_spi_t avoid
, int proto
, struct spd_route *sr
, bool tunnel_mode);
extern ipsec_spi_t get_my_cpi(struct spd_route *sr, bool tunnel_mode);
extern bool install_inbound_ipsec_sa(struct state *st);
extern bool install_ipsec_sa(struct state *st, bool inbound_also);
extern void delete_ipsec_sa(struct state *st, bool inbound_only);
extern bool route_and_eroute(struct connection *c
, struct spd_route *sr
, struct state *st);
extern bool was_eroute_idle(struct state *st, time_t idle_max
, time_t *idle_time);
extern bool get_sa_info(struct state *st, bool inbound, u_int *bytes
, time_t *use_time);
extern bool update_ipsec_sa(struct state *st);
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