net/netlabel/netlabel_mgmt.c

   1 /*
   2  * NetLabel Management Support
   3  *
   4  * This file defines the management functions for the NetLabel system.  The
   5  * NetLabel system manages static and dynamic label mappings for network
   6  * 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, 2008
  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 #include <linux/types.h>
  31 #include <linux/socket.h>
  32 #include <linux/string.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/in.h>
  35 #include <linux/in6.h>
  36 #include <linux/slab.h>
  37 #include <net/sock.h>
  38 #include <net/netlink.h>
  39 #include <net/genetlink.h>
  40 #include <net/ip.h>
  41 #include <net/ipv6.h>
  42 #include <net/netlabel.h>
  43 #include <net/cipso_ipv4.h>
  44 #include <linux/atomic.h>
  45
  46 #include "netlabel_domainhash.h"
  47 #include "netlabel_user.h"
  48 #include "netlabel_mgmt.h"
  49
  50 /* NetLabel configured protocol counter */
  51 atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
  52
  53 /* Argument struct for netlbl_domhsh_walk() */
  54 struct netlbl_domhsh_walk_arg {
  55         struct netlink_callback *nl_cb;
  56         struct sk_buff *skb;
  57         u32 seq;
  58 };
  59
  60 /* NetLabel Generic NETLINK CIPSOv4 family */
  61 static struct genl_family netlbl_mgmt_gnl_family = {
  62         .id = GENL_ID_GENERATE,
  63         .hdrsize = 0,
  64         .name = NETLBL_NLTYPE_MGMT_NAME,
  65         .version = NETLBL_PROTO_VERSION,
  66         .maxattr = NLBL_MGMT_A_MAX,
  67 };
  68
  69 /* NetLabel Netlink attribute policy */
  70 static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
  71         [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
  72         [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
  73         [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
  74         [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
  75 };
  76
  77 /*
  78  * Helper Functions
  79  */
  80
  81 /**
  82  * netlbl_mgmt_add - Handle an ADD message
  83  * @info: the Generic NETLINK info block
  84  * @audit_info: NetLabel audit information
  85  *
  86  * Description:
  87  * Helper function for the ADD and ADDDEF messages to add the domain mappings
  88  * from the message to the hash table.  See netlabel.h for a description of the
  89  * message format.  Returns zero on success, negative values on failure.
  90  *
  91  */
  92 static int netlbl_mgmt_add_common(struct genl_info *info,
  93                                   struct netlbl_audit *audit_info)
  94 {
  95         int ret_val = -EINVAL;
  96         struct netlbl_dom_map *entry = NULL;
  97         struct netlbl_domaddr_map *addrmap = NULL;
  98         struct cipso_v4_doi *cipsov4 = NULL;
  99         u32 tmp_val;
 100
 101         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 102         if (entry == NULL) {
 103                 ret_val = -ENOMEM;
 104                 goto add_failure;
 105         }
 106         entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
 107         if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
 108                 size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
 109                 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
 110                 if (entry->domain == NULL) {
 111                         ret_val = -ENOMEM;
 112                         goto add_failure;
 113                 }
 114                 nla_strlcpy(entry->domain,
 115                             info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
 116         }
 117
 118         /* NOTE: internally we allow/use a entry->def.type value of
 119          *       NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
 120          *       to pass that as a protocol value because we need to know the
 121          *       "real" protocol */
 122
 123         switch (entry->def.type) {
 124         case NETLBL_NLTYPE_UNLABELED:
 125                 break;
 126         case NETLBL_NLTYPE_CIPSOV4:
 127                 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
 128                         goto add_failure;
 129
 130                 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
 131                 cipsov4 = cipso_v4_doi_getdef(tmp_val);
 132                 if (cipsov4 == NULL)
 133                         goto add_failure;
 134                 entry->def.cipso = cipsov4;
 135                 break;
 136         default:
 137                 goto add_failure;
 138         }
 139
 140         if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
 141                 struct in_addr *addr;
 142                 struct in_addr *mask;
 143                 struct netlbl_domaddr4_map *map;
 144
 145                 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
 146                 if (addrmap == NULL) {
 147                         ret_val = -ENOMEM;
 148                         goto add_failure;
 149                 }
 150                 INIT_LIST_HEAD(&addrmap->list4);
 151                 INIT_LIST_HEAD(&addrmap->list6);
 152
 153                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
 154                     sizeof(struct in_addr)) {
 155                         ret_val = -EINVAL;
 156                         goto add_failure;
 157                 }
 158                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
 159                     sizeof(struct in_addr)) {
 160                         ret_val = -EINVAL;
 161                         goto add_failure;
 162                 }
 163                 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
 164                 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
 165
 166                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 167                 if (map == NULL) {
 168                         ret_val = -ENOMEM;
 169                         goto add_failure;
 170                 }
 171                 map->list.addr = addr->s_addr & mask->s_addr;
 172                 map->list.mask = mask->s_addr;
 173                 map->list.valid = 1;
 174                 map->def.type = entry->def.type;
 175                 if (cipsov4)
 176                         map->def.cipso = cipsov4;
 177
 178                 ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
 179                 if (ret_val != 0) {
 180                         kfree(map);
 181                         goto add_failure;
 182                 }
 183
 184                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 185                 entry->def.addrsel = addrmap;
 186 #if IS_ENABLED(CONFIG_IPV6)
 187         } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
 188                 struct in6_addr *addr;
 189                 struct in6_addr *mask;
 190                 struct netlbl_domaddr6_map *map;
 191
 192                 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
 193                 if (addrmap == NULL) {
 194                         ret_val = -ENOMEM;
 195                         goto add_failure;
 196                 }
 197                 INIT_LIST_HEAD(&addrmap->list4);
 198                 INIT_LIST_HEAD(&addrmap->list6);
 199
 200                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
 201                     sizeof(struct in6_addr)) {
 202                         ret_val = -EINVAL;
 203                         goto add_failure;
 204                 }
 205                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
 206                     sizeof(struct in6_addr)) {
 207                         ret_val = -EINVAL;
 208                         goto add_failure;
 209                 }
 210                 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
 211                 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
 212
 213                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 214                 if (map == NULL) {
 215                         ret_val = -ENOMEM;
 216                         goto add_failure;
 217                 }
 218                 map->list.addr = *addr;
 219                 map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
 220                 map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
 221                 map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
 222                 map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
 223                 map->list.mask = *mask;
 224                 map->list.valid = 1;
 225                 map->def.type = entry->def.type;
 226
 227                 ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
 228                 if (ret_val != 0) {
 229                         kfree(map);
 230                         goto add_failure;
 231                 }
 232
 233                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 234                 entry->def.addrsel = addrmap;
 235 #endif /* IPv6 */
 236         }
 237
 238         ret_val = netlbl_domhsh_add(entry, audit_info);
 239         if (ret_val != 0)
 240                 goto add_failure;
 241
 242         return 0;
 243
 244 add_failure:
 245         if (cipsov4)
 246                 cipso_v4_doi_putdef(cipsov4);
 247         if (entry)
 248                 kfree(entry->domain);
 249         kfree(addrmap);
 250         kfree(entry);
 251         return ret_val;
 252 }
 253
 254 /**
 255  * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
 256  * @skb: the NETLINK buffer
 257  * @entry: the map entry
 258  *
 259  * Description:
 260  * This function is a helper function used by the LISTALL and LISTDEF command
 261  * handlers.  The caller is responsible for ensuring that the RCU read lock
 262  * is held.  Returns zero on success, negative values on failure.
 263  *
 264  */
 265 static int netlbl_mgmt_listentry(struct sk_buff *skb,
 266                                  struct netlbl_dom_map *entry)
 267 {
 268         int ret_val = 0;
 269         struct nlattr *nla_a;
 270         struct nlattr *nla_b;
 271         struct netlbl_af4list *iter4;
 272 #if IS_ENABLED(CONFIG_IPV6)
 273         struct netlbl_af6list *iter6;
 274 #endif
 275
 276         if (entry->domain != NULL) {
 277                 ret_val = nla_put_string(skb,
 278                                          NLBL_MGMT_A_DOMAIN, entry->domain);
 279                 if (ret_val != 0)
 280                         return ret_val;
 281         }
 282
 283         switch (entry->def.type) {
 284         case NETLBL_NLTYPE_ADDRSELECT:
 285                 nla_a = nla_nest_start(skb, NLBL_MGMT_A_SELECTORLIST);
 286                 if (nla_a == NULL)
 287                         return -ENOMEM;
 288
 289                 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
 290                         struct netlbl_domaddr4_map *map4;
 291                         struct in_addr addr_struct;
 292
 293                         nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
 294                         if (nla_b == NULL)
 295                                 return -ENOMEM;
 296
 297                         addr_struct.s_addr = iter4->addr;
 298                         ret_val = nla_put(skb, NLBL_MGMT_A_IPV4ADDR,
 299                                           sizeof(struct in_addr),
 300                                           &addr_struct);
 301                         if (ret_val != 0)
 302                                 return ret_val;
 303                         addr_struct.s_addr = iter4->mask;
 304                         ret_val = nla_put(skb, NLBL_MGMT_A_IPV4MASK,
 305                                           sizeof(struct in_addr),
 306                                           &addr_struct);
 307                         if (ret_val != 0)
 308                                 return ret_val;
 309                         map4 = netlbl_domhsh_addr4_entry(iter4);
 310                         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 311                                               map4->def.type);
 312                         if (ret_val != 0)
 313                                 return ret_val;
 314                         switch (map4->def.type) {
 315                         case NETLBL_NLTYPE_CIPSOV4:
 316                                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
 317                                                       map4->def.cipso->doi);
 318                                 if (ret_val != 0)
 319                                         return ret_val;
 320                                 break;
 321                         }
 322
 323                         nla_nest_end(skb, nla_b);
 324                 }
 325 #if IS_ENABLED(CONFIG_IPV6)
 326                 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
 327                         struct netlbl_domaddr6_map *map6;
 328
 329                         nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
 330                         if (nla_b == NULL)
 331                                 return -ENOMEM;
 332
 333                         ret_val = nla_put(skb, NLBL_MGMT_A_IPV6ADDR,
 334                                           sizeof(struct in6_addr),
 335                                           &iter6->addr);
 336                         if (ret_val != 0)
 337                                 return ret_val;
 338                         ret_val = nla_put(skb, NLBL_MGMT_A_IPV6MASK,
 339                                           sizeof(struct in6_addr),
 340                                           &iter6->mask);
 341                         if (ret_val != 0)
 342                                 return ret_val;
 343                         map6 = netlbl_domhsh_addr6_entry(iter6);
 344                         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 345                                               map6->def.type);
 346                         if (ret_val != 0)
 347                                 return ret_val;
 348
 349                         nla_nest_end(skb, nla_b);
 350                 }
 351 #endif /* IPv6 */
 352
 353                 nla_nest_end(skb, nla_a);
 354                 break;
 355         case NETLBL_NLTYPE_UNLABELED:
 356                 ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
 357                 break;
 358         case NETLBL_NLTYPE_CIPSOV4:
 359                 ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
 360                 if (ret_val != 0)
 361                         return ret_val;
 362                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
 363                                       entry->def.cipso->doi);
 364                 break;
 365         }
 366
 367         return ret_val;
 368 }
 369
 370 /*
 371  * NetLabel Command Handlers
 372  */
 373
 374 /**
 375  * netlbl_mgmt_add - Handle an ADD message
 376  * @skb: the NETLINK buffer
 377  * @info: the Generic NETLINK info block
 378  *
 379  * Description:
 380  * Process a user generated ADD message and add the domains from the message
 381  * to the hash table.  See netlabel.h for a description of the message format.
 382  * Returns zero on success, negative values on failure.
 383  *
 384  */
 385 static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
 386 {
 387         struct netlbl_audit audit_info;
 388
 389         if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
 390             (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
 391             (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
 392              info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 393             (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
 394              info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
 395             ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
 396              (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
 397             ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
 398              (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
 399                 return -EINVAL;
 400
 401         netlbl_netlink_auditinfo(skb, &audit_info);
 402
 403         return netlbl_mgmt_add_common(info, &audit_info);
 404 }
 405
 406 /**
 407  * netlbl_mgmt_remove - Handle a REMOVE message
 408  * @skb: the NETLINK buffer
 409  * @info: the Generic NETLINK info block
 410  *
 411  * Description:
 412  * Process a user generated REMOVE message and remove the specified domain
 413  * mappings.  Returns zero on success, negative values on failure.
 414  *
 415  */
 416 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
 417 {
 418         char *domain;
 419         struct netlbl_audit audit_info;
 420
 421         if (!info->attrs[NLBL_MGMT_A_DOMAIN])
 422                 return -EINVAL;
 423
 424         netlbl_netlink_auditinfo(skb, &audit_info);
 425
 426         domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
 427         return netlbl_domhsh_remove(domain, &audit_info);
 428 }
 429
 430 /**
 431  * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
 432  * @entry: the domain mapping hash table entry
 433  * @arg: the netlbl_domhsh_walk_arg structure
 434  *
 435  * Description:
 436  * This function is designed to be used as a callback to the
 437  * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
 438  * message.  Returns the size of the message on success, negative values on
 439  * failure.
 440  *
 441  */
 442 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
 443 {
 444         int ret_val = -ENOMEM;
 445         struct netlbl_domhsh_walk_arg *cb_arg = arg;
 446         void *data;
 447
 448         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
 449                            cb_arg->seq, &netlbl_mgmt_gnl_family,
 450                            NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
 451         if (data == NULL)
 452                 goto listall_cb_failure;
 453
 454         ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
 455         if (ret_val != 0)
 456                 goto listall_cb_failure;
 457
 458         cb_arg->seq++;
 459         return genlmsg_end(cb_arg->skb, data);
 460
 461 listall_cb_failure:
 462         genlmsg_cancel(cb_arg->skb, data);
 463         return ret_val;
 464 }
 465
 466 /**
 467  * netlbl_mgmt_listall - Handle a LISTALL message
 468  * @skb: the NETLINK buffer
 469  * @cb: the NETLINK callback
 470  *
 471  * Description:
 472  * Process a user generated LISTALL message and dumps the domain hash table in
 473  * a form suitable for use in a kernel generated LISTALL message.  Returns zero
 474  * on success, negative values on failure.
 475  *
 476  */
 477 static int netlbl_mgmt_listall(struct sk_buff *skb,
 478                                struct netlink_callback *cb)
 479 {
 480         struct netlbl_domhsh_walk_arg cb_arg;
 481         u32 skip_bkt = cb->args[0];
 482         u32 skip_chain = cb->args[1];
 483
 484         cb_arg.nl_cb = cb;
 485         cb_arg.skb = skb;
 486         cb_arg.seq = cb->nlh->nlmsg_seq;
 487
 488         netlbl_domhsh_walk(&skip_bkt,
 489                            &skip_chain,
 490                            netlbl_mgmt_listall_cb,
 491                            &cb_arg);
 492
 493         cb->args[0] = skip_bkt;
 494         cb->args[1] = skip_chain;
 495         return skb->len;
 496 }
 497
 498 /**
 499  * netlbl_mgmt_adddef - Handle an ADDDEF message
 500  * @skb: the NETLINK buffer
 501  * @info: the Generic NETLINK info block
 502  *
 503  * Description:
 504  * Process a user generated ADDDEF message and respond accordingly.  Returns
 505  * zero on success, negative values on failure.
 506  *
 507  */
 508 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
 509 {
 510         struct netlbl_audit audit_info;
 511
 512         if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
 513             (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
 514              info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 515             (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
 516              info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
 517             ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
 518              (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
 519             ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
 520              (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
 521                 return -EINVAL;
 522
 523         netlbl_netlink_auditinfo(skb, &audit_info);
 524
 525         return netlbl_mgmt_add_common(info, &audit_info);
 526 }
 527
 528 /**
 529  * netlbl_mgmt_removedef - Handle a REMOVEDEF message
 530  * @skb: the NETLINK buffer
 531  * @info: the Generic NETLINK info block
 532  *
 533  * Description:
 534  * Process a user generated REMOVEDEF message and remove the default domain
 535  * mapping.  Returns zero on success, negative values on failure.
 536  *
 537  */
 538 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
 539 {
 540         struct netlbl_audit audit_info;
 541
 542         netlbl_netlink_auditinfo(skb, &audit_info);
 543
 544         return netlbl_domhsh_remove_default(&audit_info);
 545 }
 546
 547 /**
 548  * netlbl_mgmt_listdef - Handle a LISTDEF message
 549  * @skb: the NETLINK buffer
 550  * @info: the Generic NETLINK info block
 551  *
 552  * Description:
 553  * Process a user generated LISTDEF message and dumps the default domain
 554  * mapping in a form suitable for use in a kernel generated LISTDEF message.
 555  * Returns zero on success, negative values on failure.
 556  *
 557  */
 558 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
 559 {
 560         int ret_val = -ENOMEM;
 561         struct sk_buff *ans_skb = NULL;
 562         void *data;
 563         struct netlbl_dom_map *entry;
 564
 565         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 566         if (ans_skb == NULL)
 567                 return -ENOMEM;
 568         data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 569                                  0, NLBL_MGMT_C_LISTDEF);
 570         if (data == NULL)
 571                 goto listdef_failure;
 572
 573         rcu_read_lock();
 574         entry = netlbl_domhsh_getentry(NULL);
 575         if (entry == NULL) {
 576                 ret_val = -ENOENT;
 577                 goto listdef_failure_lock;
 578         }
 579         ret_val = netlbl_mgmt_listentry(ans_skb, entry);
 580         rcu_read_unlock();
 581         if (ret_val != 0)
 582                 goto listdef_failure;
 583
 584         genlmsg_end(ans_skb, data);
 585         return genlmsg_reply(ans_skb, info);
 586
 587 listdef_failure_lock:
 588         rcu_read_unlock();
 589 listdef_failure:
 590         kfree_skb(ans_skb);
 591         return ret_val;
 592 }
 593
 594 /**
 595  * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
 596  * @skb: the skb to write to
 597  * @cb: the NETLINK callback
 598  * @protocol: the NetLabel protocol to use in the message
 599  *
 600  * Description:
 601  * This function is to be used in conjunction with netlbl_mgmt_protocols() to
 602  * answer a application's PROTOCOLS message.  Returns the size of the message
 603  * on success, negative values on failure.
 604  *
 605  */
 606 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
 607                                     struct netlink_callback *cb,
 608                                     u32 protocol)
 609 {
 610         int ret_val = -ENOMEM;
 611         void *data;
 612
 613         data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 614                            &netlbl_mgmt_gnl_family, NLM_F_MULTI,
 615                            NLBL_MGMT_C_PROTOCOLS);
 616         if (data == NULL)
 617                 goto protocols_cb_failure;
 618
 619         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
 620         if (ret_val != 0)
 621                 goto protocols_cb_failure;
 622
 623         return genlmsg_end(skb, data);
 624
 625 protocols_cb_failure:
 626         genlmsg_cancel(skb, data);
 627         return ret_val;
 628 }
 629
 630 /**
 631  * netlbl_mgmt_protocols - Handle a PROTOCOLS message
 632  * @skb: the NETLINK buffer
 633  * @cb: the NETLINK callback
 634  *
 635  * Description:
 636  * Process a user generated PROTOCOLS message and respond accordingly.
 637  *
 638  */
 639 static int netlbl_mgmt_protocols(struct sk_buff *skb,
 640                                  struct netlink_callback *cb)
 641 {
 642         u32 protos_sent = cb->args[0];
 643
 644         if (protos_sent == 0) {
 645                 if (netlbl_mgmt_protocols_cb(skb,
 646                                              cb,
 647                                              NETLBL_NLTYPE_UNLABELED) < 0)
 648                         goto protocols_return;
 649                 protos_sent++;
 650         }
 651         if (protos_sent == 1) {
 652                 if (netlbl_mgmt_protocols_cb(skb,
 653                                              cb,
 654                                              NETLBL_NLTYPE_CIPSOV4) < 0)
 655                         goto protocols_return;
 656                 protos_sent++;
 657         }
 658
 659 protocols_return:
 660         cb->args[0] = protos_sent;
 661         return skb->len;
 662 }
 663
 664 /**
 665  * netlbl_mgmt_version - Handle a VERSION message
 666  * @skb: the NETLINK buffer
 667  * @info: the Generic NETLINK info block
 668  *
 669  * Description:
 670  * Process a user generated VERSION message and respond accordingly.  Returns
 671  * zero on success, negative values on failure.
 672  *
 673  */
 674 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
 675 {
 676         int ret_val = -ENOMEM;
 677         struct sk_buff *ans_skb = NULL;
 678         void *data;
 679
 680         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 681         if (ans_skb == NULL)
 682                 return -ENOMEM;
 683         data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 684                                  0, NLBL_MGMT_C_VERSION);
 685         if (data == NULL)
 686                 goto version_failure;
 687
 688         ret_val = nla_put_u32(ans_skb,
 689                               NLBL_MGMT_A_VERSION,
 690                               NETLBL_PROTO_VERSION);
 691         if (ret_val != 0)
 692                 goto version_failure;
 693
 694         genlmsg_end(ans_skb, data);
 695         return genlmsg_reply(ans_skb, info);
 696
 697 version_failure:
 698         kfree_skb(ans_skb);
 699         return ret_val;
 700 }
 701
 702
 703 /*
 704  * NetLabel Generic NETLINK Command Definitions
 705  */
 706
 707 static const struct genl_ops netlbl_mgmt_genl_ops[] = {
 708         {
 709         .cmd = NLBL_MGMT_C_ADD,
 710         .flags = GENL_ADMIN_PERM,
 711         .policy = netlbl_mgmt_genl_policy,
 712         .doit = netlbl_mgmt_add,
 713         .dumpit = NULL,
 714         },
 715         {
 716         .cmd = NLBL_MGMT_C_REMOVE,
 717         .flags = GENL_ADMIN_PERM,
 718         .policy = netlbl_mgmt_genl_policy,
 719         .doit = netlbl_mgmt_remove,
 720         .dumpit = NULL,
 721         },
 722         {
 723         .cmd = NLBL_MGMT_C_LISTALL,
 724         .flags = 0,
 725         .policy = netlbl_mgmt_genl_policy,
 726         .doit = NULL,
 727         .dumpit = netlbl_mgmt_listall,
 728         },
 729         {
 730         .cmd = NLBL_MGMT_C_ADDDEF,
 731         .flags = GENL_ADMIN_PERM,
 732         .policy = netlbl_mgmt_genl_policy,
 733         .doit = netlbl_mgmt_adddef,
 734         .dumpit = NULL,
 735         },
 736         {
 737         .cmd = NLBL_MGMT_C_REMOVEDEF,
 738         .flags = GENL_ADMIN_PERM,
 739         .policy = netlbl_mgmt_genl_policy,
 740         .doit = netlbl_mgmt_removedef,
 741         .dumpit = NULL,
 742         },
 743         {
 744         .cmd = NLBL_MGMT_C_LISTDEF,
 745         .flags = 0,
 746         .policy = netlbl_mgmt_genl_policy,
 747         .doit = netlbl_mgmt_listdef,
 748         .dumpit = NULL,
 749         },
 750         {
 751         .cmd = NLBL_MGMT_C_PROTOCOLS,
 752         .flags = 0,
 753         .policy = netlbl_mgmt_genl_policy,
 754         .doit = NULL,
 755         .dumpit = netlbl_mgmt_protocols,
 756         },
 757         {
 758         .cmd = NLBL_MGMT_C_VERSION,
 759         .flags = 0,
 760         .policy = netlbl_mgmt_genl_policy,
 761         .doit = netlbl_mgmt_version,
 762         .dumpit = NULL,
 763         },
 764 };
 765
 766 /*
 767  * NetLabel Generic NETLINK Protocol Functions
 768  */
 769
 770 /**
 771  * netlbl_mgmt_genl_init - Register the NetLabel management component
 772  *
 773  * Description:
 774  * Register the NetLabel management component with the Generic NETLINK
 775  * mechanism.  Returns zero on success, negative values on failure.
 776  *
 777  */
 778 int __init netlbl_mgmt_genl_init(void)
 779 {
 780         return genl_register_family_with_ops(&netlbl_mgmt_gnl_family,
 781                                              netlbl_mgmt_genl_ops);
 782 }