include/net/cipso_ipv4.h - arm/linux - Git at Google

 /*
  * CIPSO - Commercial IP Security Option
  *
  * This is an implementation of the CIPSO 2.2 protocol as specified in
  * draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
  * FIPS-188, copies of both documents can be found in the Documentation
  * directory.  While CIPSO never became a full IETF RFC standard many vendors
  * have chosen to adopt the protocol and over the years it has become a
  * de-facto standard for labeled networking.
  *
  * Author: Paul Moore <paul@paul-moore.com>
  *
  */

 /*
  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
  *
  * 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.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program;  if not, see <http://www.gnu.org/licenses/>.
  *
  */

 #ifndef _CIPSO_IPV4_H
 #define _CIPSO_IPV4_H

 #include <linux/types.h>
 #include <linux/rcupdate.h>
 #include <linux/list.h>
 #include <linux/net.h>
 #include <linux/skbuff.h>
 #include <net/netlabel.h>
 #include <net/request_sock.h>
 #include <linux/atomic.h>
 #include <linux/refcount.h>
 #include <asm/unaligned.h>

 /* known doi values */
 #define CIPSO_V4_DOI_UNKNOWN          0x00000000

 /* standard tag types */
 #define CIPSO_V4_TAG_INVALID          0
 #define CIPSO_V4_TAG_RBITMAP          1
 #define CIPSO_V4_TAG_ENUM             2
 #define CIPSO_V4_TAG_RANGE            5
 #define CIPSO_V4_TAG_PBITMAP          6
 #define CIPSO_V4_TAG_FREEFORM         7

 /* non-standard tag types (tags > 127) */
 #define CIPSO_V4_TAG_LOCAL            128

 /* doi mapping types */
 #define CIPSO_V4_MAP_UNKNOWN          0
 #define CIPSO_V4_MAP_TRANS            1
 #define CIPSO_V4_MAP_PASS             2
 #define CIPSO_V4_MAP_LOCAL            3

 /* limits */
 #define CIPSO_V4_MAX_REM_LVLS         255
 #define CIPSO_V4_INV_LVL              0x80000000
 #define CIPSO_V4_MAX_LOC_LVLS         (CIPSO_V4_INV_LVL - 1)
 #define CIPSO_V4_MAX_REM_CATS         65534
 #define CIPSO_V4_INV_CAT              0x80000000
 #define CIPSO_V4_MAX_LOC_CATS         (CIPSO_V4_INV_CAT - 1)

 /*
  * CIPSO DOI definitions
  */

 /* DOI definition struct */
 #define CIPSO_V4_TAG_MAXCNT           5
 struct cipso_v4_doi {
 	u32 doi;
 	u32 type;
 	union {
 		struct cipso_v4_std_map_tbl *std;
 	} map;
 	u8 tags[CIPSO_V4_TAG_MAXCNT];

 	refcount_t refcount;
 	struct list_head list;
 	struct rcu_head rcu;
 };

 /* Standard CIPSO mapping table */
 /* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
  *       bit is set then consider that value as unspecified, meaning the
  *       mapping for that particular level/category is invalid */
 struct cipso_v4_std_map_tbl {
 	struct {
 		u32 *cipso;
 		u32 *local;
 		u32 cipso_size;
 		u32 local_size;
 	} lvl;
 	struct {
 		u32 *cipso;
 		u32 *local;
 		u32 cipso_size;
 		u32 local_size;
 	} cat;
 };

 /*
  * Sysctl Variables
  */

 #ifdef CONFIG_NETLABEL
 extern int cipso_v4_cache_enabled;
 extern int cipso_v4_cache_bucketsize;
 extern int cipso_v4_rbm_optfmt;
 extern int cipso_v4_rbm_strictvalid;
 #endif

 /*
  * DOI List Functions
  */

 #ifdef CONFIG_NETLABEL
 int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 		     struct netlbl_audit *audit_info);
 void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
 int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
 struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
 void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
 int cipso_v4_doi_walk(u32 *skip_cnt,
 		     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 	             void *cb_arg);
 #else
 static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 				   struct netlbl_audit *audit_info)
 {
 	return -ENOSYS;
 }

 static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
 {
 	return;
 }

 static inline int cipso_v4_doi_remove(u32 doi,
 				      struct netlbl_audit *audit_info)
 {
 	return 0;
 }

 static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
 {
 	return NULL;
 }

 static inline int cipso_v4_doi_walk(u32 *skip_cnt,
 		     int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
 		     void *cb_arg)
 {
 	return 0;
 }

 static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
 					  const char *domain)
 {
 	return -ENOSYS;
 }

 static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
 					     const char *domain)
 {
 	return 0;
 }
 #endif /* CONFIG_NETLABEL */

 /*
  * Label Mapping Cache Functions
  */

 #ifdef CONFIG_NETLABEL
 void cipso_v4_cache_invalidate(void);
 int cipso_v4_cache_add(const unsigned char *cipso_ptr,
 		       const struct netlbl_lsm_secattr *secattr);
 #else
 static inline void cipso_v4_cache_invalidate(void)
 {
 	return;
 }

 static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
 				     const struct netlbl_lsm_secattr *secattr)
 {
 	return 0;
 }
 #endif /* CONFIG_NETLABEL */

 /*
  * Protocol Handling Functions
  */

 #ifdef CONFIG_NETLABEL
 void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
 int cipso_v4_getattr(const unsigned char *cipso,
 		     struct netlbl_lsm_secattr *secattr);
 int cipso_v4_sock_setattr(struct sock *sk,
 			  const struct cipso_v4_doi *doi_def,
 			  const struct netlbl_lsm_secattr *secattr);
 void cipso_v4_sock_delattr(struct sock *sk);
 int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
 int cipso_v4_req_setattr(struct request_sock *req,
 			 const struct cipso_v4_doi *doi_def,
 			 const struct netlbl_lsm_secattr *secattr);
 void cipso_v4_req_delattr(struct request_sock *req);
 int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 			    const struct cipso_v4_doi *doi_def,
 			    const struct netlbl_lsm_secattr *secattr);
 int cipso_v4_skbuff_delattr(struct sk_buff *skb);
 int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 			    struct netlbl_lsm_secattr *secattr);
 unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
 int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
 #else
 static inline void cipso_v4_error(struct sk_buff *skb,
 				  int error,
 				  u32 gateway)
 {
 	return;
 }

 static inline int cipso_v4_getattr(const unsigned char *cipso,
 				   struct netlbl_lsm_secattr *secattr)
 {
 	return -ENOSYS;
 }

 static inline int cipso_v4_sock_setattr(struct sock *sk,
 				      const struct cipso_v4_doi *doi_def,
 				      const struct netlbl_lsm_secattr *secattr)
 {
 	return -ENOSYS;
 }

 static inline void cipso_v4_sock_delattr(struct sock *sk)
 {
 }

 static inline int cipso_v4_sock_getattr(struct sock *sk,
 					struct netlbl_lsm_secattr *secattr)
 {
 	return -ENOSYS;
 }

 static inline int cipso_v4_req_setattr(struct request_sock *req,
 				       const struct cipso_v4_doi *doi_def,
 				       const struct netlbl_lsm_secattr *secattr)
 {
 	return -ENOSYS;
 }

 static inline void cipso_v4_req_delattr(struct request_sock *req)
 {
 	return;
 }

 static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
 				      const struct cipso_v4_doi *doi_def,
 				      const struct netlbl_lsm_secattr *secattr)
 {
 	return -ENOSYS;
 }

 static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
 {
 	return -ENOSYS;
 }

 static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 					  struct netlbl_lsm_secattr *secattr)
 {
 	return -ENOSYS;
 }

 static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
 {
 	return NULL;
 }

 static inline int cipso_v4_validate(const struct sk_buff *skb,
 				    unsigned char **option)
 {
 	unsigned char *opt = *option;
 	unsigned char err_offset = 0;
 	u8 opt_len = opt[1];
 	u8 opt_iter;
 	u8 tag_len;

 	if (opt_len < 8) {
 		err_offset = 1;
 		goto out;
 	}

 	if (get_unaligned_be32(&opt[2]) == 0) {
 		err_offset = 2;
 		goto out;
 	}

 	for (opt_iter = 6; opt_iter < opt_len;) {
 		if (opt_iter + 1 == opt_len) {
 			err_offset = opt_iter;
 			goto out;
 		}
 		tag_len = opt[opt_iter + 1];
 		if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
 			err_offset = opt_iter + 1;
 			goto out;
 		}
 		opt_iter += tag_len;
 	}

 out:
 	*option = opt + err_offset;
 	return err_offset;

 }
 #endif /* CONFIG_NETLABEL */

 #endif /* _CIPSO_IPV4_H */
	/*
	* CIPSO - Commercial IP Security Option
	*
	* This is an implementation of the CIPSO 2.2 protocol as specified in
	* draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
	* FIPS-188, copies of both documents can be found in the Documentation
	* directory. While CIPSO never became a full IETF RFC standard many vendors
	* have chosen to adopt the protocol and over the years it has become a
	* de-facto standard for labeled networking.
	*
	* Author: Paul Moore <paul@paul-moore.com>
	*
	*/

	/*
	* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
	*
	* 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.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*
	*/

	#ifndef _CIPSO_IPV4_H
	#define _CIPSO_IPV4_H

	#include <linux/types.h>
	#include <linux/rcupdate.h>
	#include <linux/list.h>
	#include <linux/net.h>
	#include <linux/skbuff.h>
	#include <net/netlabel.h>
	#include <net/request_sock.h>
	#include <linux/atomic.h>
	#include <linux/refcount.h>
	#include <asm/unaligned.h>

	/* known doi values */
	#define CIPSO_V4_DOI_UNKNOWN 0x00000000

	/* standard tag types */
	#define CIPSO_V4_TAG_INVALID 0
	#define CIPSO_V4_TAG_RBITMAP 1
	#define CIPSO_V4_TAG_ENUM 2
	#define CIPSO_V4_TAG_RANGE 5
	#define CIPSO_V4_TAG_PBITMAP 6
	#define CIPSO_V4_TAG_FREEFORM 7

	/* non-standard tag types (tags > 127) */
	#define CIPSO_V4_TAG_LOCAL 128

	/* doi mapping types */
	#define CIPSO_V4_MAP_UNKNOWN 0
	#define CIPSO_V4_MAP_TRANS 1
	#define CIPSO_V4_MAP_PASS 2
	#define CIPSO_V4_MAP_LOCAL 3

	/* limits */
	#define CIPSO_V4_MAX_REM_LVLS 255
	#define CIPSO_V4_INV_LVL 0x80000000
	#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
	#define CIPSO_V4_MAX_REM_CATS 65534
	#define CIPSO_V4_INV_CAT 0x80000000
	#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)

	/*
	* CIPSO DOI definitions
	*/

	/* DOI definition struct */
	#define CIPSO_V4_TAG_MAXCNT 5
	struct cipso_v4_doi {
	u32 doi;
	u32 type;
	union {
	struct cipso_v4_std_map_tbl *std;
	} map;
	u8 tags[CIPSO_V4_TAG_MAXCNT];

	refcount_t refcount;
	struct list_head list;
	struct rcu_head rcu;
	};

	/* Standard CIPSO mapping table */
	/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
	* bit is set then consider that value as unspecified, meaning the
	* mapping for that particular level/category is invalid */
	struct cipso_v4_std_map_tbl {
	struct {
	u32 *cipso;
	u32 *local;
	u32 cipso_size;
	u32 local_size;
	} lvl;
	struct {
	u32 *cipso;
	u32 *local;
	u32 cipso_size;
	u32 local_size;
	} cat;
	};

	/*
	* Sysctl Variables
	*/

	#ifdef CONFIG_NETLABEL
	extern int cipso_v4_cache_enabled;
	extern int cipso_v4_cache_bucketsize;
	extern int cipso_v4_rbm_optfmt;
	extern int cipso_v4_rbm_strictvalid;
	#endif

	/*
	* DOI List Functions
	*/

	#ifdef CONFIG_NETLABEL
	int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
	struct netlbl_audit *audit_info);
	void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
	int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
	struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
	void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
	int cipso_v4_doi_walk(u32 *skip_cnt,
	int (callback) (struct cipso_v4_doi doi_def, void *arg),
	void *cb_arg);
	#else
	static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
	struct netlbl_audit *audit_info)
	{
	return -ENOSYS;
	}

	static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
	{
	return;
	}

	static inline int cipso_v4_doi_remove(u32 doi,
	struct netlbl_audit *audit_info)
	{
	return 0;
	}

	static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
	{
	return NULL;
	}

	static inline int cipso_v4_doi_walk(u32 *skip_cnt,
	int (callback) (struct cipso_v4_doi doi_def, void *arg),
	void *cb_arg)
	{
	return 0;
	}

	static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
	const char *domain)
	{
	return -ENOSYS;
	}

	static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
	const char *domain)
	{
	return 0;
	}
	#endif /* CONFIG_NETLABEL */

	/*
	* Label Mapping Cache Functions
	*/

	#ifdef CONFIG_NETLABEL
	void cipso_v4_cache_invalidate(void);
	int cipso_v4_cache_add(const unsigned char *cipso_ptr,
	const struct netlbl_lsm_secattr *secattr);
	#else
	static inline void cipso_v4_cache_invalidate(void)
	{
	return;
	}

	static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
	const struct netlbl_lsm_secattr *secattr)
	{
	return 0;
	}
	#endif /* CONFIG_NETLABEL */

	/*
	* Protocol Handling Functions
	*/

	#ifdef CONFIG_NETLABEL
	void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
	int cipso_v4_getattr(const unsigned char *cipso,
	struct netlbl_lsm_secattr *secattr);
	int cipso_v4_sock_setattr(struct sock *sk,
	const struct cipso_v4_doi *doi_def,
	const struct netlbl_lsm_secattr *secattr);
	void cipso_v4_sock_delattr(struct sock *sk);
	int cipso_v4_sock_getattr(struct sock sk, struct netlbl_lsm_secattr secattr);
	int cipso_v4_req_setattr(struct request_sock *req,
	const struct cipso_v4_doi *doi_def,
	const struct netlbl_lsm_secattr *secattr);
	void cipso_v4_req_delattr(struct request_sock *req);
	int cipso_v4_skbuff_setattr(struct sk_buff *skb,
	const struct cipso_v4_doi *doi_def,
	const struct netlbl_lsm_secattr *secattr);
	int cipso_v4_skbuff_delattr(struct sk_buff *skb);
	int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
	struct netlbl_lsm_secattr *secattr);
	unsigned char cipso_v4_optptr(const struct sk_buff skb);
	int cipso_v4_validate(const struct sk_buff skb, unsigned char *option);
	#else
	static inline void cipso_v4_error(struct sk_buff *skb,
	int error,
	u32 gateway)
	{
	return;
	}

	static inline int cipso_v4_getattr(const unsigned char *cipso,
	struct netlbl_lsm_secattr *secattr)
	{
	return -ENOSYS;
	}

	static inline int cipso_v4_sock_setattr(struct sock *sk,
	const struct cipso_v4_doi *doi_def,
	const struct netlbl_lsm_secattr *secattr)
	{
	return -ENOSYS;
	}

	static inline void cipso_v4_sock_delattr(struct sock *sk)
	{
	}

	static inline int cipso_v4_sock_getattr(struct sock *sk,
	struct netlbl_lsm_secattr *secattr)
	{
	return -ENOSYS;
	}

	static inline int cipso_v4_req_setattr(struct request_sock *req,
	const struct cipso_v4_doi *doi_def,
	const struct netlbl_lsm_secattr *secattr)
	{
	return -ENOSYS;
	}

	static inline void cipso_v4_req_delattr(struct request_sock *req)
	{
	return;
	}

	static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
	const struct cipso_v4_doi *doi_def,
	const struct netlbl_lsm_secattr *secattr)
	{
	return -ENOSYS;
	}

	static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
	{
	return -ENOSYS;
	}

	static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
	struct netlbl_lsm_secattr *secattr)
	{
	return -ENOSYS;
	}

	static inline unsigned char cipso_v4_optptr(const struct sk_buff skb)
	{
	return NULL;
	}

	static inline int cipso_v4_validate(const struct sk_buff *skb,
	unsigned char **option)
	{
	unsigned char opt = option;
	unsigned char err_offset = 0;
	u8 opt_len = opt[1];
	u8 opt_iter;
	u8 tag_len;

	if (opt_len < 8) {
	err_offset = 1;
	goto out;
	}

	if (get_unaligned_be32(&opt[2]) == 0) {
	err_offset = 2;
	goto out;
	}

	for (opt_iter = 6; opt_iter < opt_len;) {
	if (opt_iter + 1 == opt_len) {
	err_offset = opt_iter;
	goto out;
	}
	tag_len = opt[opt_iter + 1];
	if ((tag_len == 0) \|\| (tag_len > (opt_len - opt_iter))) {
	err_offset = opt_iter + 1;
	goto out;
	}
	opt_iter += tag_len;
	}

	out:
	*option = opt + err_offset;
	return err_offset;

	}
	#endif /* CONFIG_NETLABEL */

	#endif /* _CIPSO_IPV4_H */