net/netlabel/netlabel_unlabeled.h

   1 /*
   2  * NetLabel Unlabeled Support
   3  *
   4  * This file defines functions for dealing with unlabeled packets for the
   5  * NetLabel system.  The NetLabel system manages static and dynamic label
   6  * mappings for network protocols such as CIPSO and RIPSO.
   7  *
   8  * Author: Paul Moore <paul@paul-moore.com>
   9  *
  10  */
  11
  12 /*
  13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
  14  *
  15  * This program is free software;  you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  23  * the GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program;  if not, see <http://www.gnu.org/licenses/>.
  27  *
  28  */
  29
  30 #ifndef _NETLABEL_UNLABELED_H
  31 #define _NETLABEL_UNLABELED_H
  32
  33 #include <net/netlabel.h>
  34
  35 /*
  36  * The following NetLabel payloads are supported by the Unlabeled subsystem.
  37  *
  38  * o STATICADD
  39  *   This message is sent from an application to add a new static label for
  40  *   incoming unlabeled connections.
  41  *
  42  *   Required attributes:
  43  *
  44  *     NLBL_UNLABEL_A_IFACE
  45  *     NLBL_UNLABEL_A_SECCTX
  46  *
  47  *   If IPv4 is specified the following attributes are required:
  48  *
  49  *     NLBL_UNLABEL_A_IPV4ADDR
  50  *     NLBL_UNLABEL_A_IPV4MASK
  51  *
  52  *   If IPv6 is specified the following attributes are required:
  53  *
  54  *     NLBL_UNLABEL_A_IPV6ADDR
  55  *     NLBL_UNLABEL_A_IPV6MASK
  56  *
  57  * o STATICREMOVE
  58  *   This message is sent from an application to remove an existing static
  59  *   label for incoming unlabeled connections.
  60  *
  61  *   Required attributes:
  62  *
  63  *     NLBL_UNLABEL_A_IFACE
  64  *
  65  *   If IPv4 is specified the following attributes are required:
  66  *
  67  *     NLBL_UNLABEL_A_IPV4ADDR
  68  *     NLBL_UNLABEL_A_IPV4MASK
  69  *
  70  *   If IPv6 is specified the following attributes are required:
  71  *
  72  *     NLBL_UNLABEL_A_IPV6ADDR
  73  *     NLBL_UNLABEL_A_IPV6MASK
  74  *
  75  * o STATICLIST
  76  *   This message can be sent either from an application or by the kernel in
  77  *   response to an application generated STATICLIST message.  When sent by an
  78  *   application there is no payload and the NLM_F_DUMP flag should be set.
  79  *   The kernel should response with a series of the following messages.
  80  *
  81  *   Required attributes:
  82  *
  83  *     NLBL_UNLABEL_A_IFACE
  84  *     NLBL_UNLABEL_A_SECCTX
  85  *
  86  *   If IPv4 is specified the following attributes are required:
  87  *
  88  *     NLBL_UNLABEL_A_IPV4ADDR
  89  *     NLBL_UNLABEL_A_IPV4MASK
  90  *
  91  *   If IPv6 is specified the following attributes are required:
  92  *
  93  *     NLBL_UNLABEL_A_IPV6ADDR
  94  *     NLBL_UNLABEL_A_IPV6MASK
  95  *
  96  * o STATICADDDEF
  97  *   This message is sent from an application to set the default static
  98  *   label for incoming unlabeled connections.
  99  *
 100  *   Required attribute:
 101  *
 102  *     NLBL_UNLABEL_A_SECCTX
 103  *
 104  *   If IPv4 is specified the following attributes are required:
 105  *
 106  *     NLBL_UNLABEL_A_IPV4ADDR
 107  *     NLBL_UNLABEL_A_IPV4MASK
 108  *
 109  *   If IPv6 is specified the following attributes are required:
 110  *
 111  *     NLBL_UNLABEL_A_IPV6ADDR
 112  *     NLBL_UNLABEL_A_IPV6MASK
 113  *
 114  * o STATICREMOVEDEF
 115  *   This message is sent from an application to remove the existing default
 116  *   static label for incoming unlabeled connections.
 117  *
 118  *   If IPv4 is specified the following attributes are required:
 119  *
 120  *     NLBL_UNLABEL_A_IPV4ADDR
 121  *     NLBL_UNLABEL_A_IPV4MASK
 122  *
 123  *   If IPv6 is specified the following attributes are required:
 124  *
 125  *     NLBL_UNLABEL_A_IPV6ADDR
 126  *     NLBL_UNLABEL_A_IPV6MASK
 127  *
 128  * o STATICLISTDEF
 129  *   This message can be sent either from an application or by the kernel in
 130  *   response to an application generated STATICLISTDEF message.  When sent by
 131  *   an application there is no payload and the NLM_F_DUMP flag should be set.
 132  *   The kernel should response with the following message.
 133  *
 134  *   Required attribute:
 135  *
 136  *     NLBL_UNLABEL_A_SECCTX
 137  *
 138  *   If IPv4 is specified the following attributes are required:
 139  *
 140  *     NLBL_UNLABEL_A_IPV4ADDR
 141  *     NLBL_UNLABEL_A_IPV4MASK
 142  *
 143  *   If IPv6 is specified the following attributes are required:
 144  *
 145  *     NLBL_UNLABEL_A_IPV6ADDR
 146  *     NLBL_UNLABEL_A_IPV6MASK
 147  *
 148  * o ACCEPT
 149  *   This message is sent from an application to specify if the kernel should
 150  *   allow unlabled packets to pass if they do not match any of the static
 151  *   mappings defined in the unlabeled module.
 152  *
 153  *   Required attributes:
 154  *
 155  *     NLBL_UNLABEL_A_ACPTFLG
 156  *
 157  * o LIST
 158  *   This message can be sent either from an application or by the kernel in
 159  *   response to an application generated LIST message.  When sent by an
 160  *   application there is no payload.  The kernel should respond to a LIST
 161  *   message with a LIST message on success.
 162  *
 163  *   Required attributes:
 164  *
 165  *     NLBL_UNLABEL_A_ACPTFLG
 166  *
 167  */
 168
 169 /* NetLabel Unlabeled commands */
 170 enum {
 171         NLBL_UNLABEL_C_UNSPEC,
 172         NLBL_UNLABEL_C_ACCEPT,
 173         NLBL_UNLABEL_C_LIST,
 174         NLBL_UNLABEL_C_STATICADD,
 175         NLBL_UNLABEL_C_STATICREMOVE,
 176         NLBL_UNLABEL_C_STATICLIST,
 177         NLBL_UNLABEL_C_STATICADDDEF,
 178         NLBL_UNLABEL_C_STATICREMOVEDEF,
 179         NLBL_UNLABEL_C_STATICLISTDEF,
 180         __NLBL_UNLABEL_C_MAX,
 181 };
 182
 183 /* NetLabel Unlabeled attributes */
 184 enum {
 185         NLBL_UNLABEL_A_UNSPEC,
 186         NLBL_UNLABEL_A_ACPTFLG,
 187         /* (NLA_U8)
 188          * if true then unlabeled packets are allowed to pass, else unlabeled
 189          * packets are rejected */
 190         NLBL_UNLABEL_A_IPV6ADDR,
 191         /* (NLA_BINARY, struct in6_addr)
 192          * an IPv6 address */
 193         NLBL_UNLABEL_A_IPV6MASK,
 194         /* (NLA_BINARY, struct in6_addr)
 195          * an IPv6 address mask */
 196         NLBL_UNLABEL_A_IPV4ADDR,
 197         /* (NLA_BINARY, struct in_addr)
 198          * an IPv4 address */
 199         NLBL_UNLABEL_A_IPV4MASK,
 200         /* (NLA_BINARY, struct in_addr)
 201          * and IPv4 address mask */
 202         NLBL_UNLABEL_A_IFACE,
 203         /* (NLA_NULL_STRING)
 204          * network interface */
 205         NLBL_UNLABEL_A_SECCTX,
 206         /* (NLA_BINARY)
 207          * a LSM specific security context */
 208         __NLBL_UNLABEL_A_MAX,
 209 };
 210 #define NLBL_UNLABEL_A_MAX (__NLBL_UNLABEL_A_MAX - 1)
 211
 212 /* NetLabel protocol functions */
 213 int netlbl_unlabel_genl_init(void);
 214
 215 /* Unlabeled connection hash table size */
 216 /* XXX - currently this number is an uneducated guess */
 217 #define NETLBL_UNLHSH_BITSIZE       7
 218
 219 /* General Unlabeled init function */
 220 int netlbl_unlabel_init(u32 size);
 221
 222 /* Static/Fallback label management functions */
 223 int netlbl_unlhsh_add(struct net *net,
 224                       const char *dev_name,
 225                       const void *addr,
 226                       const void *mask,
 227                       u32 addr_len,
 228                       u32 secid,
 229                       struct netlbl_audit *audit_info);
 230 int netlbl_unlhsh_remove(struct net *net,
 231                          const char *dev_name,
 232                          const void *addr,
 233                          const void *mask,
 234                          u32 addr_len,
 235                          struct netlbl_audit *audit_info);
 236
 237 /* Process Unlabeled incoming network packets */
 238 int netlbl_unlabel_getattr(const struct sk_buff *skb,
 239                            u16 family,
 240                            struct netlbl_lsm_secattr *secattr);
 241
 242 /* Set the default configuration to allow Unlabeled packets */
 243 int netlbl_unlabel_defconf(void);
 244
 245 #endif