1 files changed, 306 insertions, 0 deletions
diff --git a/include/net/cipso_ipv4.h b/include/net/cipso_ipv4.h
new file mode 100644
index 000000000..53dd7d988
--- /dev/null
+++ b/include/net/cipso_ipv4.h
@@ -0,0 +1,306 @@
+/* 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 <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;
+}
+#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 */