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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* 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
*/
#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 <linux/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;
}
#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,
bool sk_locked);
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,
bool sk_locked)
{
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 */
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