1 files changed, 231 insertions, 0 deletions

diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
new file mode 100644
index 000000000000..0fd8aaafe23f
--- /dev/null
+++ b/net/netlabel/netlabel_kapi.c
@@ -0,0 +1,231 @@
+/*
+ * NetLabel Kernel API
+ *
+ * This file defines the kernel API for the NetLabel system.  The NetLabel
+ * system manages static and dynamic label mappings for network protocols such
+ * as CIPSO and RIPSO.
+ *
+ * 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
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <net/ip.h>
+#include <net/netlabel.h>
+#include <net/cipso_ipv4.h>
+#include <asm/bug.h>
+
+#include "netlabel_domainhash.h"
+#include "netlabel_unlabeled.h"
+#include "netlabel_user.h"
+
+/*
+ * LSM Functions
+ */
+
+/**
+ * netlbl_socket_setattr - Label a socket using the correct protocol
+ * @sock: the socket to label
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Attach the correct label to the given socket using the security attributes
+ * specified in @secattr.  This function requires exclusive access to
+ * @sock->sk, which means it either needs to be in the process of being
+ * created or locked via lock_sock(sock->sk).  Returns zero on success,
+ * negative values on failure.
+ *
+ */
+int netlbl_socket_setattr(const struct socket *sock,
+                          const struct netlbl_lsm_secattr *secattr)
+{
+        int ret_val = -ENOENT;
+        struct netlbl_dom_map *dom_entry;
+
+        rcu_read_lock();
+        dom_entry = netlbl_domhsh_getentry(secattr->domain);
+        if (dom_entry == NULL)
+                goto socket_setattr_return;
+        switch (dom_entry->type) {
+        case NETLBL_NLTYPE_CIPSOV4:
+                ret_val = cipso_v4_socket_setattr(sock,
+                                                  dom_entry->type_def.cipsov4,
+                                                  secattr);
+                break;
+        case NETLBL_NLTYPE_UNLABELED:
+                ret_val = 0;
+                break;
+        default:
+                ret_val = -ENOENT;
+        }
+
+socket_setattr_return:
+        rcu_read_unlock();
+        return ret_val;
+}
+
+/**
+ * netlbl_socket_getattr - Determine the security attributes of a socket
+ * @sock: the socket
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Examines the given socket to see any NetLabel style labeling has been
+ * applied to the socket, if so it parses the socket label and returns the
+ * security attributes in @secattr.  Returns zero on success, negative values
+ * on failure.
+ *
+ */
+int netlbl_socket_getattr(const struct socket *sock,
+                          struct netlbl_lsm_secattr *secattr)
+{
+        int ret_val;
+
+        ret_val = cipso_v4_socket_getattr(sock, secattr);
+        if (ret_val == 0)
+                return 0;
+
+        return netlbl_unlabel_getattr(secattr);
+}
+
+/**
+ * netlbl_skbuff_getattr - Determine the security attributes of a packet
+ * @skb: the packet
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Examines the given packet to see if a recognized form of packet labeling
+ * is present, if so it parses the packet label and returns the security
+ * attributes in @secattr.  Returns zero on success, negative values on
+ * failure.
+ *
+ */
+int netlbl_skbuff_getattr(const struct sk_buff *skb,
+                          struct netlbl_lsm_secattr *secattr)
+{
+        int ret_val;
+
+        ret_val = cipso_v4_skbuff_getattr(skb, secattr);
+        if (ret_val == 0)
+                return 0;
+
+        return netlbl_unlabel_getattr(secattr);
+}
+
+/**
+ * netlbl_skbuff_err - Handle a LSM error on a sk_buff
+ * @skb: the packet
+ * @error: the error code
+ *
+ * Description:
+ * Deal with a LSM problem when handling the packet in @skb, typically this is
+ * a permission denied problem (-EACCES).  The correct action is determined
+ * according to the packet's labeling protocol.
+ *
+ */
+void netlbl_skbuff_err(struct sk_buff *skb, int error)
+{
+        if (CIPSO_V4_OPTEXIST(skb))
+                cipso_v4_error(skb, error, 0);
+}
+
+/**
+ * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
+ *
+ * Description:
+ * For all of the NetLabel protocols that support some form of label mapping
+ * cache, invalidate the cache.  Returns zero on success, negative values on
+ * error.
+ *
+ */
+void netlbl_cache_invalidate(void)
+{
+        cipso_v4_cache_invalidate();
+}
+
+/**
+ * netlbl_cache_add - Add an entry to a NetLabel protocol cache
+ * @skb: the packet
+ * @secattr: the packet's security attributes
+ *
+ * Description:
+ * Add the LSM security attributes for the given packet to the underlying
+ * NetLabel protocol's label mapping cache.  Returns zero on success, negative
+ * values on error.
+ *
+ */
+int netlbl_cache_add(const struct sk_buff *skb,
+                     const struct netlbl_lsm_secattr *secattr)
+{
+        if (secattr->cache.data == NULL)
+                return -ENOMSG;
+
+        if (CIPSO_V4_OPTEXIST(skb))
+                return cipso_v4_cache_add(skb, secattr);
+
+        return -ENOMSG;
+}
+
+/*
+ * Setup Functions
+ */
+
+/**
+ * netlbl_init - Initialize NetLabel
+ *
+ * Description:
+ * Perform the required NetLabel initialization before first use.
+ *
+ */
+static int __init netlbl_init(void)
+{
+        int ret_val;
+
+        printk(KERN_INFO "NetLabel: Initializing\n");
+        printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
+               (1 << NETLBL_DOMHSH_BITSIZE));
+        printk(KERN_INFO "NetLabel:  protocols ="
+               " UNLABELED"
+               " CIPSOv4"
+               "\n");
+
+        ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
+        if (ret_val != 0)
+                goto init_failure;
+
+        ret_val = netlbl_netlink_init();
+        if (ret_val != 0)
+                goto init_failure;
+
+        ret_val = netlbl_unlabel_defconf();
+        if (ret_val != 0)
+                goto init_failure;
+        printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
+
+        return 0;
+
+init_failure:
+        panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
+}
+
+subsys_initcall(netlbl_init);