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_domaddr_map *addrmap = NULL;
  97         struct cipso_v4_doi *cipsov4 = NULL;
  98         u32 tmp_val;
  99         struct netlbl_dom_map *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 100
 101         if (!entry)
 102                 return -ENOMEM;
 103         entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
 104         if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
 105                 size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
 106                 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
 107                 if (entry->domain == NULL) {
 108                         ret_val = -ENOMEM;
 109                         goto add_free_entry;
 110                 }
 111                 nla_strlcpy(entry->domain,
 112                             info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
 113         }
 114
 115         /* NOTE: internally we allow/use a entry->def.type value of
 116          *       NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
 117          *       to pass that as a protocol value because we need to know the
 118          *       "real" protocol */
 119
 120         switch (entry->def.type) {
 121         case NETLBL_NLTYPE_UNLABELED:
 122                 break;
 123         case NETLBL_NLTYPE_CIPSOV4:
 124                 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
 125                         goto add_free_domain;
 126
 127                 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
 128                 cipsov4 = cipso_v4_doi_getdef(tmp_val);
 129                 if (cipsov4 == NULL)
 130                         goto add_free_domain;
 131                 entry->def.cipso = cipsov4;
 132                 break;
 133         default:
 134                 goto add_free_domain;
 135         }
 136
 137         if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
 138                 struct in_addr *addr;
 139                 struct in_addr *mask;
 140                 struct netlbl_domaddr4_map *map;
 141
 142                 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
 143                 if (addrmap == NULL) {
 144                         ret_val = -ENOMEM;
 145                         goto add_doi_put_def;
 146                 }
 147                 INIT_LIST_HEAD(&addrmap->list4);
 148                 INIT_LIST_HEAD(&addrmap->list6);
 149
 150                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
 151                     sizeof(struct in_addr)) {
 152                         ret_val = -EINVAL;
 153                         goto add_free_addrmap;
 154                 }
 155                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
 156                     sizeof(struct in_addr)) {
 157                         ret_val = -EINVAL;
 158                         goto add_free_addrmap;
 159                 }
 160                 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
 161                 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
 162
 163                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 164                 if (map == NULL) {
 165                         ret_val = -ENOMEM;
 166                         goto add_free_addrmap;
 167                 }
 168                 map->list.addr = addr->s_addr & mask->s_addr;
 169                 map->list.mask = mask->s_addr;
 170                 map->list.valid = 1;
 171                 map->def.type = entry->def.type;
 172                 if (cipsov4)
 173                         map->def.cipso = cipsov4;
 174
 175                 ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
 176                 if (ret_val != 0) {
 177                         kfree(map);
 178                         goto add_free_addrmap;
 179                 }
 180
 181                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 182                 entry->def.addrsel = addrmap;
 183 #if IS_ENABLED(CONFIG_IPV6)
 184         } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
 185                 struct in6_addr *addr;
 186                 struct in6_addr *mask;
 187                 struct netlbl_domaddr6_map *map;
 188
 189                 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
 190                 if (addrmap == NULL) {
 191                         ret_val = -ENOMEM;
 192                         goto add_doi_put_def;
 193                 }
 194                 INIT_LIST_HEAD(&addrmap->list4);
 195                 INIT_LIST_HEAD(&addrmap->list6);
 196
 197                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
 198                     sizeof(struct in6_addr)) {
 199                         ret_val = -EINVAL;
 200                         goto add_free_addrmap;
 201                 }
 202                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
 203                     sizeof(struct in6_addr)) {
 204                         ret_val = -EINVAL;
 205                         goto add_free_addrmap;
 206                 }
 207                 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
 208                 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
 209
 210                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 211                 if (map == NULL) {
 212                         ret_val = -ENOMEM;
 213                         goto add_free_addrmap;
 214                 }
 215                 map->list.addr = *addr;
 216                 map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
 217                 map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
 218                 map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
 219                 map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
 220                 map->list.mask = *mask;
 221                 map->list.valid = 1;
 222                 map->def.type = entry->def.type;
 223
 224                 ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
 225                 if (ret_val != 0) {
 226                         kfree(map);
 227                         goto add_free_addrmap;
 228                 }
 229
 230                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 231                 entry->def.addrsel = addrmap;
 232 #endif /* IPv6 */
 233         }
 234
 235         ret_val = netlbl_domhsh_add(entry, audit_info);
 236         if (ret_val != 0)
 237                 goto add_free_addrmap;
 238
 239         return 0;
 240
 241 add_free_addrmap:
 242         kfree(addrmap);
 243 add_doi_put_def:
 244         cipso_v4_doi_putdef(cipsov4);
 245 add_free_domain:
 246         kfree(entry->domain);
 247 add_free_entry:
 248         kfree(entry);
 249         return ret_val;
 250 }
 251
 252 /**
 253  * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
 254  * @skb: the NETLINK buffer
 255  * @entry: the map entry
 256  *
 257  * Description:
 258  * This function is a helper function used by the LISTALL and LISTDEF command
 259  * handlers.  The caller is responsible for ensuring that the RCU read lock
 260  * is held.  Returns zero on success, negative values on failure.
 261  *
 262  */
 263 static int netlbl_mgmt_listentry(struct sk_buff *skb,
 264                                  struct netlbl_dom_map *entry)
 265 {
 266         int ret_val = 0;
 267         struct nlattr *nla_a;
 268         struct nlattr *nla_b;
 269         struct netlbl_af4list *iter4;
 270 #if IS_ENABLED(CONFIG_IPV6)
 271         struct netlbl_af6list *iter6;
 272 #endif
 273
 274         if (entry->domain != NULL) {
 275                 ret_val = nla_put_string(skb,
 276                                          NLBL_MGMT_A_DOMAIN, entry->domain);
 277                 if (ret_val != 0)
 278                         return ret_val;
 279         }
 280
 281         switch (entry->def.type) {
 282         case NETLBL_NLTYPE_ADDRSELECT:
 283                 nla_a = nla_nest_start(skb, NLBL_MGMT_A_SELECTORLIST);
 284                 if (nla_a == NULL)
 285                         return -ENOMEM;
 286
 287                 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
 288                         struct netlbl_domaddr4_map *map4;
 289                         struct in_addr addr_struct;
 290
 291                         nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
 292                         if (nla_b == NULL)
 293                                 return -ENOMEM;
 294
 295                         addr_struct.s_addr = iter4->addr;
 296                         ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4ADDR,
 297                                                   addr_struct.s_addr);
 298                         if (ret_val != 0)
 299                                 return ret_val;
 300                         addr_struct.s_addr = iter4->mask;
 301                         ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4MASK,
 302                                                   addr_struct.s_addr);
 303                         if (ret_val != 0)
 304                                 return ret_val;
 305                         map4 = netlbl_domhsh_addr4_entry(iter4);
 306                         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 307                                               map4->def.type);
 308                         if (ret_val != 0)
 309                                 return ret_val;
 310                         switch (map4->def.type) {
 311                         case NETLBL_NLTYPE_CIPSOV4:
 312                                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
 313                                                       map4->def.cipso->doi);
 314                                 if (ret_val != 0)
 315                                         return ret_val;
 316                                 break;
 317                         }
 318
 319                         nla_nest_end(skb, nla_b);
 320                 }
 321 #if IS_ENABLED(CONFIG_IPV6)
 322                 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
 323                         struct netlbl_domaddr6_map *map6;
 324
 325                         nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
 326                         if (nla_b == NULL)
 327                                 return -ENOMEM;
 328
 329                         ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6ADDR,
 330                                                    &iter6->addr);
 331                         if (ret_val != 0)
 332                                 return ret_val;
 333                         ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6MASK,
 334                                                    &iter6->mask);
 335                         if (ret_val != 0)
 336                                 return ret_val;
 337                         map6 = netlbl_domhsh_addr6_entry(iter6);
 338                         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 339                                               map6->def.type);
 340                         if (ret_val != 0)
 341                                 return ret_val;
 342
 343                         nla_nest_end(skb, nla_b);
 344                 }
 345 #endif /* IPv6 */
 346
 347                 nla_nest_end(skb, nla_a);
 348                 break;
 349         case NETLBL_NLTYPE_UNLABELED:
 350                 ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
 351                 break;
 352         case NETLBL_NLTYPE_CIPSOV4:
 353                 ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
 354                 if (ret_val != 0)
 355                         return ret_val;
 356                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
 357                                       entry->def.cipso->doi);
 358                 break;
 359         }
 360
 361         return ret_val;
 362 }
 363
 364 /*
 365  * NetLabel Command Handlers
 366  */
 367
 368 /**
 369  * netlbl_mgmt_add - Handle an ADD message
 370  * @skb: the NETLINK buffer
 371  * @info: the Generic NETLINK info block
 372  *
 373  * Description:
 374  * Process a user generated ADD message and add the domains from the message
 375  * to the hash table.  See netlabel.h for a description of the message format.
 376  * Returns zero on success, negative values on failure.
 377  *
 378  */
 379 static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
 380 {
 381         struct netlbl_audit audit_info;
 382
 383         if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
 384             (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
 385             (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
 386              info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 387             (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
 388              info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
 389             ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
 390              (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
 391             ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
 392              (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
 393                 return -EINVAL;
 394
 395         netlbl_netlink_auditinfo(skb, &audit_info);
 396
 397         return netlbl_mgmt_add_common(info, &audit_info);
 398 }
 399
 400 /**
 401  * netlbl_mgmt_remove - Handle a REMOVE message
 402  * @skb: the NETLINK buffer
 403  * @info: the Generic NETLINK info block
 404  *
 405  * Description:
 406  * Process a user generated REMOVE message and remove the specified domain
 407  * mappings.  Returns zero on success, negative values on failure.
 408  *
 409  */
 410 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
 411 {
 412         char *domain;
 413         struct netlbl_audit audit_info;
 414
 415         if (!info->attrs[NLBL_MGMT_A_DOMAIN])
 416                 return -EINVAL;
 417
 418         netlbl_netlink_auditinfo(skb, &audit_info);
 419
 420         domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
 421         return netlbl_domhsh_remove(domain, &audit_info);
 422 }
 423
 424 /**
 425  * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
 426  * @entry: the domain mapping hash table entry
 427  * @arg: the netlbl_domhsh_walk_arg structure
 428  *
 429  * Description:
 430  * This function is designed to be used as a callback to the
 431  * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
 432  * message.  Returns the size of the message on success, negative values on
 433  * failure.
 434  *
 435  */
 436 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
 437 {
 438         int ret_val = -ENOMEM;
 439         struct netlbl_domhsh_walk_arg *cb_arg = arg;
 440         void *data;
 441
 442         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
 443                            cb_arg->seq, &netlbl_mgmt_gnl_family,
 444                            NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
 445         if (data == NULL)
 446                 goto listall_cb_failure;
 447
 448         ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
 449         if (ret_val != 0)
 450                 goto listall_cb_failure;
 451
 452         cb_arg->seq++;
 453         genlmsg_end(cb_arg->skb, data);
 454         return 0;
 455
 456 listall_cb_failure:
 457         genlmsg_cancel(cb_arg->skb, data);
 458         return ret_val;
 459 }
 460
 461 /**
 462  * netlbl_mgmt_listall - Handle a LISTALL message
 463  * @skb: the NETLINK buffer
 464  * @cb: the NETLINK callback
 465  *
 466  * Description:
 467  * Process a user generated LISTALL message and dumps the domain hash table in
 468  * a form suitable for use in a kernel generated LISTALL message.  Returns zero
 469  * on success, negative values on failure.
 470  *
 471  */
 472 static int netlbl_mgmt_listall(struct sk_buff *skb,
 473                                struct netlink_callback *cb)
 474 {
 475         struct netlbl_domhsh_walk_arg cb_arg;
 476         u32 skip_bkt = cb->args[0];
 477         u32 skip_chain = cb->args[1];
 478
 479         cb_arg.nl_cb = cb;
 480         cb_arg.skb = skb;
 481         cb_arg.seq = cb->nlh->nlmsg_seq;
 482
 483         netlbl_domhsh_walk(&skip_bkt,
 484                            &skip_chain,
 485                            netlbl_mgmt_listall_cb,
 486                            &cb_arg);
 487
 488         cb->args[0] = skip_bkt;
 489         cb->args[1] = skip_chain;
 490         return skb->len;
 491 }
 492
 493 /**
 494  * netlbl_mgmt_adddef - Handle an ADDDEF message
 495  * @skb: the NETLINK buffer
 496  * @info: the Generic NETLINK info block
 497  *
 498  * Description:
 499  * Process a user generated ADDDEF message and respond accordingly.  Returns
 500  * zero on success, negative values on failure.
 501  *
 502  */
 503 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
 504 {
 505         struct netlbl_audit audit_info;
 506
 507         if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
 508             (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
 509              info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 510             (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
 511              info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
 512             ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
 513              (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
 514             ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
 515              (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
 516                 return -EINVAL;
 517
 518         netlbl_netlink_auditinfo(skb, &audit_info);
 519
 520         return netlbl_mgmt_add_common(info, &audit_info);
 521 }
 522
 523 /**
 524  * netlbl_mgmt_removedef - Handle a REMOVEDEF message
 525  * @skb: the NETLINK buffer
 526  * @info: the Generic NETLINK info block
 527  *
 528  * Description:
 529  * Process a user generated REMOVEDEF message and remove the default domain
 530  * mapping.  Returns zero on success, negative values on failure.
 531  *
 532  */
 533 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
 534 {
 535         struct netlbl_audit audit_info;
 536
 537         netlbl_netlink_auditinfo(skb, &audit_info);
 538
 539         return netlbl_domhsh_remove_default(&audit_info);
 540 }
 541
 542 /**
 543  * netlbl_mgmt_listdef - Handle a LISTDEF message
 544  * @skb: the NETLINK buffer
 545  * @info: the Generic NETLINK info block
 546  *
 547  * Description:
 548  * Process a user generated LISTDEF message and dumps the default domain
 549  * mapping in a form suitable for use in a kernel generated LISTDEF message.
 550  * Returns zero on success, negative values on failure.
 551  *
 552  */
 553 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
 554 {
 555         int ret_val = -ENOMEM;
 556         struct sk_buff *ans_skb = NULL;
 557         void *data;
 558         struct netlbl_dom_map *entry;
 559
 560         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 561         if (ans_skb == NULL)
 562                 return -ENOMEM;
 563         data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 564                                  0, NLBL_MGMT_C_LISTDEF);
 565         if (data == NULL)
 566                 goto listdef_failure;
 567
 568         rcu_read_lock();
 569         entry = netlbl_domhsh_getentry(NULL);
 570         if (entry == NULL) {
 571                 ret_val = -ENOENT;
 572                 goto listdef_failure_lock;
 573         }
 574         ret_val = netlbl_mgmt_listentry(ans_skb, entry);
 575         rcu_read_unlock();
 576         if (ret_val != 0)
 577                 goto listdef_failure;
 578
 579         genlmsg_end(ans_skb, data);
 580         return genlmsg_reply(ans_skb, info);
 581
 582 listdef_failure_lock:
 583         rcu_read_unlock();
 584 listdef_failure:
 585         kfree_skb(ans_skb);
 586         return ret_val;
 587 }
 588
 589 /**
 590  * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
 591  * @skb: the skb to write to
 592  * @cb: the NETLINK callback
 593  * @protocol: the NetLabel protocol to use in the message
 594  *
 595  * Description:
 596  * This function is to be used in conjunction with netlbl_mgmt_protocols() to
 597  * answer a application's PROTOCOLS message.  Returns the size of the message
 598  * on success, negative values on failure.
 599  *
 600  */
 601 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
 602                                     struct netlink_callback *cb,
 603                                     u32 protocol)
 604 {
 605         int ret_val = -ENOMEM;
 606         void *data;
 607
 608         data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 609                            &netlbl_mgmt_gnl_family, NLM_F_MULTI,
 610                            NLBL_MGMT_C_PROTOCOLS);
 611         if (data == NULL)
 612                 goto protocols_cb_failure;
 613
 614         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
 615         if (ret_val != 0)
 616                 goto protocols_cb_failure;
 617
 618         genlmsg_end(skb, data);
 619         return 0;
 620
 621 protocols_cb_failure:
 622         genlmsg_cancel(skb, data);
 623         return ret_val;
 624 }
 625
 626 /**
 627  * netlbl_mgmt_protocols - Handle a PROTOCOLS message
 628  * @skb: the NETLINK buffer
 629  * @cb: the NETLINK callback
 630  *
 631  * Description:
 632  * Process a user generated PROTOCOLS message and respond accordingly.
 633  *
 634  */
 635 static int netlbl_mgmt_protocols(struct sk_buff *skb,
 636                                  struct netlink_callback *cb)
 637 {
 638         u32 protos_sent = cb->args[0];
 639
 640         if (protos_sent == 0) {
 641                 if (netlbl_mgmt_protocols_cb(skb,
 642                                              cb,
 643                                              NETLBL_NLTYPE_UNLABELED) < 0)
 644                         goto protocols_return;
 645                 protos_sent++;
 646         }
 647         if (protos_sent == 1) {
 648                 if (netlbl_mgmt_protocols_cb(skb,
 649                                              cb,
 650                                              NETLBL_NLTYPE_CIPSOV4) < 0)
 651                         goto protocols_return;
 652                 protos_sent++;
 653         }
 654
 655 protocols_return:
 656         cb->args[0] = protos_sent;
 657         return skb->len;
 658 }
 659
 660 /**
 661  * netlbl_mgmt_version - Handle a VERSION message
 662  * @skb: the NETLINK buffer
 663  * @info: the Generic NETLINK info block
 664  *
 665  * Description:
 666  * Process a user generated VERSION message and respond accordingly.  Returns
 667  * zero on success, negative values on failure.
 668  *
 669  */
 670 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
 671 {
 672         int ret_val = -ENOMEM;
 673         struct sk_buff *ans_skb = NULL;
 674         void *data;
 675
 676         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 677         if (ans_skb == NULL)
 678                 return -ENOMEM;
 679         data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 680                                  0, NLBL_MGMT_C_VERSION);
 681         if (data == NULL)
 682                 goto version_failure;
 683
 684         ret_val = nla_put_u32(ans_skb,
 685                               NLBL_MGMT_A_VERSION,
 686                               NETLBL_PROTO_VERSION);
 687         if (ret_val != 0)
 688                 goto version_failure;
 689
 690         genlmsg_end(ans_skb, data);
 691         return genlmsg_reply(ans_skb, info);
 692
 693 version_failure:
 694         kfree_skb(ans_skb);
 695         return ret_val;
 696 }
 697
 698
 699 /*
 700  * NetLabel Generic NETLINK Command Definitions
 701  */
 702
 703 static const struct genl_ops netlbl_mgmt_genl_ops[] = {
 704         {
 705         .cmd = NLBL_MGMT_C_ADD,
 706         .flags = GENL_ADMIN_PERM,
 707         .policy = netlbl_mgmt_genl_policy,
 708         .doit = netlbl_mgmt_add,
 709         .dumpit = NULL,
 710         },
 711         {
 712         .cmd = NLBL_MGMT_C_REMOVE,
 713         .flags = GENL_ADMIN_PERM,
 714         .policy = netlbl_mgmt_genl_policy,
 715         .doit = netlbl_mgmt_remove,
 716         .dumpit = NULL,
 717         },
 718         {
 719         .cmd = NLBL_MGMT_C_LISTALL,
 720         .flags = 0,
 721         .policy = netlbl_mgmt_genl_policy,
 722         .doit = NULL,
 723         .dumpit = netlbl_mgmt_listall,
 724         },
 725         {
 726         .cmd = NLBL_MGMT_C_ADDDEF,
 727         .flags = GENL_ADMIN_PERM,
 728         .policy = netlbl_mgmt_genl_policy,
 729         .doit = netlbl_mgmt_adddef,
 730         .dumpit = NULL,
 731         },
 732         {
 733         .cmd = NLBL_MGMT_C_REMOVEDEF,
 734         .flags = GENL_ADMIN_PERM,
 735         .policy = netlbl_mgmt_genl_policy,
 736         .doit = netlbl_mgmt_removedef,
 737         .dumpit = NULL,
 738         },
 739         {
 740         .cmd = NLBL_MGMT_C_LISTDEF,
 741         .flags = 0,
 742         .policy = netlbl_mgmt_genl_policy,
 743         .doit = netlbl_mgmt_listdef,
 744         .dumpit = NULL,
 745         },
 746         {
 747         .cmd = NLBL_MGMT_C_PROTOCOLS,
 748         .flags = 0,
 749         .policy = netlbl_mgmt_genl_policy,
 750         .doit = NULL,
 751         .dumpit = netlbl_mgmt_protocols,
 752         },
 753         {
 754         .cmd = NLBL_MGMT_C_VERSION,
 755         .flags = 0,
 756         .policy = netlbl_mgmt_genl_policy,
 757         .doit = netlbl_mgmt_version,
 758         .dumpit = NULL,
 759         },
 760 };
 761
 762 /*
 763  * NetLabel Generic NETLINK Protocol Functions
 764  */
 765
 766 /**
 767  * netlbl_mgmt_genl_init - Register the NetLabel management component
 768  *
 769  * Description:
 770  * Register the NetLabel management component with the Generic NETLINK
 771  * mechanism.  Returns zero on success, negative values on failure.
 772  *
 773  */
 774 int __init netlbl_mgmt_genl_init(void)
 775 {
 776         return genl_register_family_with_ops(&netlbl_mgmt_gnl_family,
 777                                              netlbl_mgmt_genl_ops);
 778 }