/* 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 <[email protected]> */ /* * (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 … /* standard tag types */ #define CIPSO_V4_TAG_INVALID … #define CIPSO_V4_TAG_RBITMAP … #define CIPSO_V4_TAG_ENUM … #define CIPSO_V4_TAG_RANGE … #define CIPSO_V4_TAG_PBITMAP … #define CIPSO_V4_TAG_FREEFORM … /* non-standard tag types (tags > 127) */ #define CIPSO_V4_TAG_LOCAL … /* doi mapping types */ #define CIPSO_V4_MAP_UNKNOWN … #define CIPSO_V4_MAP_TRANS … #define CIPSO_V4_MAP_PASS … #define CIPSO_V4_MAP_LOCAL … /* limits */ #define CIPSO_V4_MAX_REM_LVLS … #define CIPSO_V4_INV_LVL … #define CIPSO_V4_MAX_LOC_LVLS … #define CIPSO_V4_MAX_REM_CATS … #define CIPSO_V4_INV_CAT … #define CIPSO_V4_MAX_LOC_CATS … /* * CIPSO DOI definitions */ /* DOI definition struct */ #define CIPSO_V4_TAG_MAXCNT … struct cipso_v4_doi { … }; /* 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 { … }; /* * 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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