Huw Davies | cb72d38 | 2016-06-27 15:02:46 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * NetLabel CALIPSO/IPv6 Support |
| 3 | * |
| 4 | * This file defines the CALIPSO/IPv6 functions for the NetLabel system. The |
| 5 | * NetLabel system manages static and dynamic label mappings for network |
| 6 | * protocols such as CIPSO and CALIPSO. |
| 7 | * |
| 8 | * Authors: Paul Moore <paul@paul-moore.com> |
| 9 | * Huw Davies <huw@codeweavers.com> |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | /* (c) Copyright Hewlett-Packard Development Company, L.P., 2006 |
| 14 | * (c) Copyright Huw Davies <huw@codeweavers.com>, 2015 |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License as published by |
| 18 | * the Free Software Foundation; either version 2 of the License, or |
| 19 | * (at your option) any later version. |
| 20 | * |
| 21 | * This program is distributed in the hope that it will be useful, |
| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 24 | * the GNU General Public License for more details. |
| 25 | * |
| 26 | * You should have received a copy of the GNU General Public License |
| 27 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 28 | * |
| 29 | */ |
| 30 | |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/socket.h> |
| 33 | #include <linux/string.h> |
| 34 | #include <linux/skbuff.h> |
| 35 | #include <linux/audit.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <net/sock.h> |
| 38 | #include <net/netlink.h> |
| 39 | #include <net/genetlink.h> |
| 40 | #include <net/netlabel.h> |
| 41 | #include <net/calipso.h> |
| 42 | #include <linux/atomic.h> |
| 43 | |
| 44 | #include "netlabel_user.h" |
| 45 | #include "netlabel_calipso.h" |
| 46 | #include "netlabel_mgmt.h" |
| 47 | #include "netlabel_domainhash.h" |
| 48 | |
| 49 | /* NetLabel Generic NETLINK CALIPSO family */ |
| 50 | static struct genl_family netlbl_calipso_gnl_family = { |
| 51 | .id = GENL_ID_GENERATE, |
| 52 | .hdrsize = 0, |
| 53 | .name = NETLBL_NLTYPE_CALIPSO_NAME, |
| 54 | .version = NETLBL_PROTO_VERSION, |
| 55 | .maxattr = NLBL_CALIPSO_A_MAX, |
| 56 | }; |
| 57 | |
| 58 | /* NetLabel Netlink attribute policy */ |
| 59 | static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = { |
| 60 | [NLBL_CALIPSO_A_DOI] = { .type = NLA_U32 }, |
| 61 | [NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 }, |
| 62 | }; |
| 63 | |
| 64 | /* NetLabel Command Handlers |
| 65 | */ |
| 66 | /** |
| 67 | * netlbl_calipso_add_pass - Adds a CALIPSO pass DOI definition |
| 68 | * @info: the Generic NETLINK info block |
| 69 | * @audit_info: NetLabel audit information |
| 70 | * |
| 71 | * Description: |
| 72 | * Create a new CALIPSO_MAP_PASS DOI definition based on the given ADD message |
| 73 | * and add it to the CALIPSO engine. Return zero on success and non-zero on |
| 74 | * error. |
| 75 | * |
| 76 | */ |
| 77 | static int netlbl_calipso_add_pass(struct genl_info *info, |
| 78 | struct netlbl_audit *audit_info) |
| 79 | { |
| 80 | int ret_val; |
| 81 | struct calipso_doi *doi_def = NULL; |
| 82 | |
| 83 | doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL); |
| 84 | if (!doi_def) |
| 85 | return -ENOMEM; |
| 86 | doi_def->type = CALIPSO_MAP_PASS; |
| 87 | doi_def->doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]); |
| 88 | ret_val = calipso_doi_add(doi_def, audit_info); |
| 89 | if (ret_val != 0) |
| 90 | calipso_doi_free(doi_def); |
| 91 | |
| 92 | return ret_val; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * netlbl_calipso_add - Handle an ADD message |
| 97 | * @skb: the NETLINK buffer |
| 98 | * @info: the Generic NETLINK info block |
| 99 | * |
| 100 | * Description: |
| 101 | * Create a new DOI definition based on the given ADD message and add it to the |
| 102 | * CALIPSO engine. Returns zero on success, negative values on failure. |
| 103 | * |
| 104 | */ |
| 105 | static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info) |
| 106 | |
| 107 | { |
| 108 | int ret_val = -EINVAL; |
| 109 | struct netlbl_audit audit_info; |
| 110 | |
| 111 | if (!info->attrs[NLBL_CALIPSO_A_DOI] || |
| 112 | !info->attrs[NLBL_CALIPSO_A_MTYPE]) |
| 113 | return -EINVAL; |
| 114 | |
| 115 | netlbl_netlink_auditinfo(skb, &audit_info); |
| 116 | switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) { |
| 117 | case CALIPSO_MAP_PASS: |
| 118 | ret_val = netlbl_calipso_add_pass(info, &audit_info); |
| 119 | break; |
| 120 | } |
| 121 | if (ret_val == 0) |
| 122 | atomic_inc(&netlabel_mgmt_protocount); |
| 123 | |
| 124 | return ret_val; |
| 125 | } |
| 126 | |
| 127 | /* NetLabel Generic NETLINK Command Definitions |
| 128 | */ |
| 129 | |
| 130 | static const struct genl_ops netlbl_calipso_ops[] = { |
| 131 | { |
| 132 | .cmd = NLBL_CALIPSO_C_ADD, |
| 133 | .flags = GENL_ADMIN_PERM, |
| 134 | .policy = calipso_genl_policy, |
| 135 | .doit = netlbl_calipso_add, |
| 136 | .dumpit = NULL, |
| 137 | }, |
| 138 | }; |
| 139 | |
| 140 | /* NetLabel Generic NETLINK Protocol Functions |
| 141 | */ |
| 142 | |
| 143 | /** |
| 144 | * netlbl_calipso_genl_init - Register the CALIPSO NetLabel component |
| 145 | * |
| 146 | * Description: |
| 147 | * Register the CALIPSO packet NetLabel component with the Generic NETLINK |
| 148 | * mechanism. Returns zero on success, negative values on failure. |
| 149 | * |
| 150 | */ |
| 151 | int __init netlbl_calipso_genl_init(void) |
| 152 | { |
| 153 | return genl_register_family_with_ops(&netlbl_calipso_gnl_family, |
| 154 | netlbl_calipso_ops); |
| 155 | } |
| 156 | |
| 157 | static const struct netlbl_calipso_ops *calipso_ops; |
| 158 | |
| 159 | /** |
| 160 | * netlbl_calipso_ops_register - Register the CALIPSO operations |
| 161 | * |
| 162 | * Description: |
| 163 | * Register the CALIPSO packet engine operations. |
| 164 | * |
| 165 | */ |
| 166 | const struct netlbl_calipso_ops * |
| 167 | netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops) |
| 168 | { |
| 169 | return xchg(&calipso_ops, ops); |
| 170 | } |
| 171 | EXPORT_SYMBOL(netlbl_calipso_ops_register); |
| 172 | |
| 173 | static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void) |
| 174 | { |
| 175 | return ACCESS_ONCE(calipso_ops); |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * calipso_doi_add - Add a new DOI to the CALIPSO protocol engine |
| 180 | * @doi_def: the DOI structure |
| 181 | * @audit_info: NetLabel audit information |
| 182 | * |
| 183 | * Description: |
| 184 | * The caller defines a new DOI for use by the CALIPSO engine and calls this |
| 185 | * function to add it to the list of acceptable domains. The caller must |
| 186 | * ensure that the mapping table specified in @doi_def->map meets all of the |
| 187 | * requirements of the mapping type (see calipso.h for details). Returns |
| 188 | * zero on success and non-zero on failure. |
| 189 | * |
| 190 | */ |
| 191 | int calipso_doi_add(struct calipso_doi *doi_def, |
| 192 | struct netlbl_audit *audit_info) |
| 193 | { |
| 194 | int ret_val = -ENOMSG; |
| 195 | const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get(); |
| 196 | |
| 197 | if (ops) |
| 198 | ret_val = ops->doi_add(doi_def, audit_info); |
| 199 | return ret_val; |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * calipso_doi_free - Frees a DOI definition |
| 204 | * @doi_def: the DOI definition |
| 205 | * |
| 206 | * Description: |
| 207 | * This function frees all of the memory associated with a DOI definition. |
| 208 | * |
| 209 | */ |
| 210 | void calipso_doi_free(struct calipso_doi *doi_def) |
| 211 | { |
| 212 | const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get(); |
| 213 | |
| 214 | if (ops) |
| 215 | ops->doi_free(doi_def); |
| 216 | } |