319 lines
7.6 KiB
C
319 lines
7.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* CIPSO - Commercial IP Security Option
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*
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* This is an implementation of the CIPSO 2.2 protocol as specified in
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* draft-ietf-cipso-ipsecurity-01.txt with additional tag types as found in
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* FIPS-188, copies of both documents can be found in the Documentation
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* directory. While CIPSO never became a full IETF RFC standard many vendors
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* have chosen to adopt the protocol and over the years it has become a
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* de-facto standard for labeled networking.
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*
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* Author: Paul Moore <paul@paul-moore.com>
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*/
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/*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*/
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#ifndef _CIPSO_IPV4_H
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#define _CIPSO_IPV4_H
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#include <linux/types.h>
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#include <linux/rcupdate.h>
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#include <linux/list.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <net/netlabel.h>
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#include <net/request_sock.h>
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#include <linux/atomic.h>
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#include <linux/refcount.h>
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#include <asm/unaligned.h>
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/* known doi values */
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#define CIPSO_V4_DOI_UNKNOWN 0x00000000
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/* standard tag types */
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#define CIPSO_V4_TAG_INVALID 0
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#define CIPSO_V4_TAG_RBITMAP 1
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#define CIPSO_V4_TAG_ENUM 2
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#define CIPSO_V4_TAG_RANGE 5
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#define CIPSO_V4_TAG_PBITMAP 6
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#define CIPSO_V4_TAG_FREEFORM 7
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/* non-standard tag types (tags > 127) */
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#define CIPSO_V4_TAG_LOCAL 128
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/* doi mapping types */
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#define CIPSO_V4_MAP_UNKNOWN 0
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#define CIPSO_V4_MAP_TRANS 1
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#define CIPSO_V4_MAP_PASS 2
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#define CIPSO_V4_MAP_LOCAL 3
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/* limits */
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#define CIPSO_V4_MAX_REM_LVLS 255
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#define CIPSO_V4_INV_LVL 0x80000000
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#define CIPSO_V4_MAX_LOC_LVLS (CIPSO_V4_INV_LVL - 1)
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#define CIPSO_V4_MAX_REM_CATS 65534
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#define CIPSO_V4_INV_CAT 0x80000000
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#define CIPSO_V4_MAX_LOC_CATS (CIPSO_V4_INV_CAT - 1)
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/*
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* CIPSO DOI definitions
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*/
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/* DOI definition struct */
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#define CIPSO_V4_TAG_MAXCNT 5
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struct cipso_v4_doi {
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u32 doi;
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u32 type;
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union {
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struct cipso_v4_std_map_tbl *std;
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} map;
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u8 tags[CIPSO_V4_TAG_MAXCNT];
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refcount_t refcount;
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struct list_head list;
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struct rcu_head rcu;
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};
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/* Standard CIPSO mapping table */
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/* NOTE: the highest order bit (i.e. 0x80000000) is an 'invalid' flag, if the
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* bit is set then consider that value as unspecified, meaning the
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* mapping for that particular level/category is invalid */
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struct cipso_v4_std_map_tbl {
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struct {
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u32 *cipso;
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u32 *local;
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u32 cipso_size;
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u32 local_size;
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} lvl;
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struct {
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u32 *cipso;
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u32 *local;
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u32 cipso_size;
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u32 local_size;
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} cat;
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};
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/*
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* Sysctl Variables
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*/
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#ifdef CONFIG_NETLABEL
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extern int cipso_v4_cache_enabled;
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extern int cipso_v4_cache_bucketsize;
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extern int cipso_v4_rbm_optfmt;
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extern int cipso_v4_rbm_strictvalid;
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#endif
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/*
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* DOI List Functions
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*/
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#ifdef CONFIG_NETLABEL
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int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
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struct netlbl_audit *audit_info);
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void cipso_v4_doi_free(struct cipso_v4_doi *doi_def);
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int cipso_v4_doi_remove(u32 doi, struct netlbl_audit *audit_info);
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struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
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void cipso_v4_doi_putdef(struct cipso_v4_doi *doi_def);
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int cipso_v4_doi_walk(u32 *skip_cnt,
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int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
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void *cb_arg);
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#else
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static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
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struct netlbl_audit *audit_info)
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{
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return -ENOSYS;
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}
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static inline void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
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{
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return;
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}
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static inline int cipso_v4_doi_remove(u32 doi,
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struct netlbl_audit *audit_info)
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{
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return 0;
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}
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static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
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{
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return NULL;
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}
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static inline int cipso_v4_doi_walk(u32 *skip_cnt,
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int (*callback) (struct cipso_v4_doi *doi_def, void *arg),
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void *cb_arg)
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{
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return 0;
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}
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static inline int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def,
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const char *domain)
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{
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return -ENOSYS;
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}
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static inline int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
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const char *domain)
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{
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return 0;
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}
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#endif /* CONFIG_NETLABEL */
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/*
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* Label Mapping Cache Functions
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*/
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#ifdef CONFIG_NETLABEL
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void cipso_v4_cache_invalidate(void);
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int cipso_v4_cache_add(const unsigned char *cipso_ptr,
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const struct netlbl_lsm_secattr *secattr);
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#else
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static inline void cipso_v4_cache_invalidate(void)
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{
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return;
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}
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static inline int cipso_v4_cache_add(const unsigned char *cipso_ptr,
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const struct netlbl_lsm_secattr *secattr)
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{
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return 0;
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}
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#endif /* CONFIG_NETLABEL */
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/*
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* Protocol Handling Functions
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*/
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#ifdef CONFIG_NETLABEL
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void cipso_v4_error(struct sk_buff *skb, int error, u32 gateway);
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int cipso_v4_getattr(const unsigned char *cipso,
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struct netlbl_lsm_secattr *secattr);
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int cipso_v4_sock_setattr(struct sock *sk,
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const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr);
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void cipso_v4_sock_delattr(struct sock *sk);
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int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
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int cipso_v4_req_setattr(struct request_sock *req,
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const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr);
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void cipso_v4_req_delattr(struct request_sock *req);
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int cipso_v4_skbuff_setattr(struct sk_buff *skb,
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const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr);
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int cipso_v4_skbuff_delattr(struct sk_buff *skb);
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int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
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struct netlbl_lsm_secattr *secattr);
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unsigned char *cipso_v4_optptr(const struct sk_buff *skb);
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int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option);
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#else
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static inline void cipso_v4_error(struct sk_buff *skb,
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int error,
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u32 gateway)
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{
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return;
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}
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static inline int cipso_v4_getattr(const unsigned char *cipso,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int cipso_v4_sock_setattr(struct sock *sk,
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const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline void cipso_v4_sock_delattr(struct sock *sk)
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{
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}
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static inline int cipso_v4_sock_getattr(struct sock *sk,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int cipso_v4_req_setattr(struct request_sock *req,
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const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline void cipso_v4_req_delattr(struct request_sock *req)
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{
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return;
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}
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static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
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const struct cipso_v4_doi *doi_def,
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const struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline int cipso_v4_skbuff_delattr(struct sk_buff *skb)
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{
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return -ENOSYS;
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}
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static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOSYS;
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}
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static inline unsigned char *cipso_v4_optptr(const struct sk_buff *skb)
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{
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return NULL;
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}
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static inline int cipso_v4_validate(const struct sk_buff *skb,
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unsigned char **option)
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{
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unsigned char *opt = *option;
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unsigned char err_offset = 0;
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u8 opt_len = opt[1];
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u8 opt_iter;
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u8 tag_len;
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if (opt_len < 8) {
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err_offset = 1;
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goto out;
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}
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if (get_unaligned_be32(&opt[2]) == 0) {
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err_offset = 2;
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goto out;
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}
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for (opt_iter = 6; opt_iter < opt_len;) {
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if (opt_iter + 1 == opt_len) {
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err_offset = opt_iter;
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goto out;
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}
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tag_len = opt[opt_iter + 1];
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if ((tag_len == 0) || (tag_len > (opt_len - opt_iter))) {
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err_offset = opt_iter + 1;
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goto out;
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}
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opt_iter += tag_len;
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}
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out:
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*option = opt + err_offset;
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return err_offset;
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}
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#endif /* CONFIG_NETLABEL */
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#endif /* _CIPSO_IPV4_H */
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