[NetLabel]: core network changes

Changes to the core network stack to support the NetLabel subsystem.  This
includes changes to the IPv4 option handling to support CIPSO labels.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 250 insertions, 0 deletions

diff --git a/include/net/cipso_ipv4.h b/include/net/cipso_ipv4.h
new file mode 100644
index 000000000000..c7175e725804
--- /dev/null
+++ b/include/net/cipso_ipv4.h
@@ -0,0 +1,250 @@
+/*
+ * 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.moore@hp.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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifndef _CIPSO_IPV4_H
+#define _CIPSO_IPV4_H
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <net/netlabel.h>
+
+/* known doi values */
+#define CIPSO_V4_DOI_UNKNOWN          0x00000000
+
+/* 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
+
+/* doi mapping types */
+#define CIPSO_V4_MAP_UNKNOWN          0
+#define CIPSO_V4_MAP_STD              1
+#define CIPSO_V4_MAP_PASS             2
+
+/* limits */
+#define CIPSO_V4_MAX_REM_LVLS         256
+#define CIPSO_V4_INV_LVL              0x80000000
+#define CIPSO_V4_MAX_LOC_LVLS         (CIPSO_V4_INV_LVL - 1)
+#define CIPSO_V4_MAX_REM_CATS         65536
+#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];
+
+        u32 valid;
+        struct list_head list;
+        struct rcu_head rcu;
+        struct list_head dom_list;
+};
+
+/* 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
+
+/*
+ * Helper Functions
+ */
+
+#define CIPSO_V4_OPTEXIST(x) (IPCB(x)->opt.cipso != 0)
+#define CIPSO_V4_OPTPTR(x) ((x)->nh.raw + IPCB(x)->opt.cipso)
+
+/*
+ * DOI List Functions
+ */
+
+#ifdef CONFIG_NETLABEL
+int cipso_v4_doi_add(struct cipso_v4_doi *doi_def);
+int cipso_v4_doi_remove(u32 doi, void (*callback) (struct rcu_head * head));
+struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi);
+struct sk_buff *cipso_v4_doi_dump_all(size_t headroom);
+struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom);
+int cipso_v4_doi_domhsh_add(struct cipso_v4_doi *doi_def, const char *domain);
+int cipso_v4_doi_domhsh_remove(struct cipso_v4_doi *doi_def,
+                               const char *domain);
+#else
+static inline int cipso_v4_doi_add(struct cipso_v4_doi *doi_def)
+{
+        return -ENOSYS;
+}
+
+static inline int cipso_v4_doi_remove(u32 doi,
+                                    void (*callback) (struct rcu_head * head))
+{
+        return 0;
+}
+
+static inline struct cipso_v4_doi *cipso_v4_doi_getdef(u32 doi)
+{
+        return NULL;
+}
+
+static inline struct sk_buff *cipso_v4_doi_dump_all(size_t headroom)
+{
+        return NULL;
+}
+
+static inline struct sk_buff *cipso_v4_doi_dump(u32 doi, size_t headroom)
+{
+        return NULL;
+}
+
+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 struct sk_buff *skb,
+                       const struct netlbl_lsm_secattr *secattr);
+#else
+static inline void cipso_v4_cache_invalidate(void)
+{
+        return;
+}
+
+static inline int cipso_v4_cache_add(const struct sk_buff *skb,
+                                     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_socket_setopt(struct socket *sock,
+                           unsigned char *opt,
+                           u32 opt_len);
+int cipso_v4_socket_setattr(const struct socket *sock,
+                            const struct cipso_v4_doi *doi_def,
+                            const struct netlbl_lsm_secattr *secattr);
+int cipso_v4_socket_getopt(const struct socket *sock,
+                           unsigned char **opt,
+                           u32 *opt_len);
+int cipso_v4_socket_getattr(const struct socket *sock,
+                            struct netlbl_lsm_secattr *secattr);
+int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
+                            struct netlbl_lsm_secattr *secattr);
+int cipso_v4_validate(unsigned char **option);
+#else
+static inline void cipso_v4_error(struct sk_buff *skb,
+                                  int error,
+                                  u32 gateway)
+{
+        return;
+}
+
+static inline int cipso_v4_socket_setattr(const struct socket *sock,
+                                  const struct cipso_v4_doi *doi_def,
+                                  const struct netlbl_lsm_secattr *secattr)
+{
+        return -ENOSYS;
+}
+
+static inline int cipso_v4_socket_getattr(const struct socket *sock,
+                                          struct netlbl_lsm_secattr *secattr)
+{
+        return -ENOSYS;
+}
+
+static inline int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
+                                          struct netlbl_lsm_secattr *secattr)
+{
+        return -ENOSYS;
+}
+
+static inline int cipso_v4_validate(unsigned char **option)
+{
+        return -ENOSYS;
+}
+#endif /* CONFIG_NETLABEL */
+
+#endif /* _CIPSO_IPV4_H */