net/netlabel/netlabel_cipso_v4.c

   1 /*
   2  * NetLabel CIPSO/IPv4 Support
   3  *
   4  * This file defines the CIPSO/IPv4 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.moore@hp.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, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  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 <net/sock.h>
  37 #include <net/netlink.h>
  38 #include <net/genetlink.h>
  39 #include <net/netlabel.h>
  40 #include <net/cipso_ipv4.h>
  41
  42 #include "netlabel_user.h"
  43 #include "netlabel_cipso_v4.h"
  44
  45 /* Argument struct for cipso_v4_doi_walk() */
  46 struct netlbl_cipsov4_doiwalk_arg {
  47         struct netlink_callback *nl_cb;
  48         struct sk_buff *skb;
  49         u32 seq;
  50 };
  51
  52 /* NetLabel Generic NETLINK CIPSOv4 family */
  53 static struct genl_family netlbl_cipsov4_gnl_family = {
  54         .id = GENL_ID_GENERATE,
  55         .hdrsize = 0,
  56         .name = NETLBL_NLTYPE_CIPSOV4_NAME,
  57         .version = NETLBL_PROTO_VERSION,
  58         .maxattr = NLBL_CIPSOV4_A_MAX,
  59 };
  60
  61 /* NetLabel Netlink attribute policy */
  62 static struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
  63         [NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
  64         [NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
  65         [NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
  66         [NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
  67         [NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
  68         [NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
  69         [NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
  70         [NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
  71         [NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
  72         [NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
  73         [NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
  74         [NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
  75 };
  76
  77 /*
  78  * Helper Functions
  79  */
  80
  81 /**
  82  * netlbl_cipsov4_doi_free - Frees a CIPSO V4 DOI definition
  83  * @entry: the entry's RCU field
  84  *
  85  * Description:
  86  * This function is designed to be used as a callback to the call_rcu()
  87  * function so that the memory allocated to the DOI definition can be released
  88  * safely.
  89  *
  90  */
  91 static void netlbl_cipsov4_doi_free(struct rcu_head *entry)
  92 {
  93         struct cipso_v4_doi *ptr;
  94
  95         ptr = container_of(entry, struct cipso_v4_doi, rcu);
  96         switch (ptr->type) {
  97         case CIPSO_V4_MAP_STD:
  98                 kfree(ptr->map.std->lvl.cipso);
  99                 kfree(ptr->map.std->lvl.local);
 100                 kfree(ptr->map.std->cat.cipso);
 101                 kfree(ptr->map.std->cat.local);
 102                 break;
 103         }
 104         kfree(ptr);
 105 }
 106
 107 /**
 108  * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
 109  * @info: the Generic NETLINK info block
 110  * @doi_def: the CIPSO V4 DOI definition
 111  *
 112  * Description:
 113  * Parse the common sections of a ADD message and fill in the related values
 114  * in @doi_def.  Returns zero on success, negative values on failure.
 115  *
 116  */
 117 static int netlbl_cipsov4_add_common(struct genl_info *info,
 118                                      struct cipso_v4_doi *doi_def)
 119 {
 120         struct nlattr *nla;
 121         int nla_rem;
 122         u32 iter = 0;
 123
 124         doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 125
 126         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
 127                                 NLBL_CIPSOV4_A_MAX,
 128                                 netlbl_cipsov4_genl_policy) != 0)
 129                 return -EINVAL;
 130
 131         nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
 132                 if (nla->nla_type == NLBL_CIPSOV4_A_TAG) {
 133                         if (iter > CIPSO_V4_TAG_MAXCNT)
 134                                 return -EINVAL;
 135                         doi_def->tags[iter++] = nla_get_u8(nla);
 136                 }
 137         if (iter < CIPSO_V4_TAG_MAXCNT)
 138                 doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
 139
 140         return 0;
 141 }
 142
 143 /*
 144  * NetLabel Command Handlers
 145  */
 146
 147 /**
 148  * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
 149  * @info: the Generic NETLINK info block
 150  *
 151  * Description:
 152  * Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message
 153  * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
 154  * error.
 155  *
 156  */
 157 static int netlbl_cipsov4_add_std(struct genl_info *info)
 158 {
 159         int ret_val = -EINVAL;
 160         struct cipso_v4_doi *doi_def = NULL;
 161         struct nlattr *nla_a;
 162         struct nlattr *nla_b;
 163         int nla_a_rem;
 164         int nla_b_rem;
 165
 166         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
 167             !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
 168                 return -EINVAL;
 169
 170         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 171                                 NLBL_CIPSOV4_A_MAX,
 172                                 netlbl_cipsov4_genl_policy) != 0)
 173                 return -EINVAL;
 174
 175         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 176         if (doi_def == NULL)
 177                 return -ENOMEM;
 178         doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
 179         if (doi_def->map.std == NULL) {
 180                 ret_val = -ENOMEM;
 181                 goto add_std_failure;
 182         }
 183         doi_def->type = CIPSO_V4_MAP_STD;
 184
 185         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 186         if (ret_val != 0)
 187                 goto add_std_failure;
 188         ret_val = -EINVAL;
 189
 190         nla_for_each_nested(nla_a,
 191                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 192                             nla_a_rem)
 193                 if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) {
 194                         if (nla_validate_nested(nla_a,
 195                                             NLBL_CIPSOV4_A_MAX,
 196                                             netlbl_cipsov4_genl_policy) != 0)
 197                                         goto add_std_failure;
 198                         nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 199                                 switch (nla_b->nla_type) {
 200                                 case NLBL_CIPSOV4_A_MLSLVLLOC:
 201                                         if (nla_get_u32(nla_b) >
 202                                             CIPSO_V4_MAX_LOC_LVLS)
 203                                                 goto add_std_failure;
 204                                         if (nla_get_u32(nla_b) >=
 205                                             doi_def->map.std->lvl.local_size)
 206                                              doi_def->map.std->lvl.local_size =
 207                                                      nla_get_u32(nla_b) + 1;
 208                                         break;
 209                                 case NLBL_CIPSOV4_A_MLSLVLREM:
 210                                         if (nla_get_u32(nla_b) >
 211                                             CIPSO_V4_MAX_REM_LVLS)
 212                                                 goto add_std_failure;
 213                                         if (nla_get_u32(nla_b) >=
 214                                             doi_def->map.std->lvl.cipso_size)
 215                                              doi_def->map.std->lvl.cipso_size =
 216                                                      nla_get_u32(nla_b) + 1;
 217                                         break;
 218                                 }
 219                 }
 220         doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
 221                                               sizeof(u32),
 222                                               GFP_KERNEL);
 223         if (doi_def->map.std->lvl.local == NULL) {
 224                 ret_val = -ENOMEM;
 225                 goto add_std_failure;
 226         }
 227         doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
 228                                               sizeof(u32),
 229                                               GFP_KERNEL);
 230         if (doi_def->map.std->lvl.cipso == NULL) {
 231                 ret_val = -ENOMEM;
 232                 goto add_std_failure;
 233         }
 234         nla_for_each_nested(nla_a,
 235                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 236                             nla_a_rem)
 237                 if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) {
 238                         struct nlattr *lvl_loc;
 239                         struct nlattr *lvl_rem;
 240
 241                         lvl_loc = nla_find_nested(nla_a,
 242                                                   NLBL_CIPSOV4_A_MLSLVLLOC);
 243                         lvl_rem = nla_find_nested(nla_a,
 244                                                   NLBL_CIPSOV4_A_MLSLVLREM);
 245                         if (lvl_loc == NULL || lvl_rem == NULL)
 246                                 goto add_std_failure;
 247                         doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
 248                                 nla_get_u32(lvl_rem);
 249                         doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
 250                                 nla_get_u32(lvl_loc);
 251                 }
 252
 253         if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
 254                 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 255                                         NLBL_CIPSOV4_A_MAX,
 256                                         netlbl_cipsov4_genl_policy) != 0)
 257                         goto add_std_failure;
 258
 259                 nla_for_each_nested(nla_a,
 260                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 261                                     nla_a_rem)
 262                         if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSCAT) {
 263                                 if (nla_validate_nested(nla_a,
 264                                               NLBL_CIPSOV4_A_MAX,
 265                                               netlbl_cipsov4_genl_policy) != 0)
 266                                         goto add_std_failure;
 267                                 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 268                                         switch (nla_b->nla_type) {
 269                                         case NLBL_CIPSOV4_A_MLSCATLOC:
 270                                                 if (nla_get_u32(nla_b) >
 271                                                     CIPSO_V4_MAX_LOC_CATS)
 272                                                         goto add_std_failure;
 273                                                 if (nla_get_u32(nla_b) >=
 274                                               doi_def->map.std->cat.local_size)
 275                                              doi_def->map.std->cat.local_size =
 276                                                      nla_get_u32(nla_b) + 1;
 277                                                 break;
 278                                         case NLBL_CIPSOV4_A_MLSCATREM:
 279                                                 if (nla_get_u32(nla_b) >
 280                                                     CIPSO_V4_MAX_REM_CATS)
 281                                                         goto add_std_failure;
 282                                                 if (nla_get_u32(nla_b) >=
 283                                               doi_def->map.std->cat.cipso_size)
 284                                              doi_def->map.std->cat.cipso_size =
 285                                                      nla_get_u32(nla_b) + 1;
 286                                                 break;
 287                                         }
 288                         }
 289                 doi_def->map.std->cat.local = kcalloc(
 290                                               doi_def->map.std->cat.local_size,
 291                                               sizeof(u32),
 292                                               GFP_KERNEL);
 293                 if (doi_def->map.std->cat.local == NULL) {
 294                         ret_val = -ENOMEM;
 295                         goto add_std_failure;
 296                 }
 297                 doi_def->map.std->cat.cipso = kcalloc(
 298                                               doi_def->map.std->cat.cipso_size,
 299                                               sizeof(u32),
 300                                               GFP_KERNEL);
 301                 if (doi_def->map.std->cat.cipso == NULL) {
 302                         ret_val = -ENOMEM;
 303                         goto add_std_failure;
 304                 }
 305                 nla_for_each_nested(nla_a,
 306                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 307                                     nla_a_rem)
 308                         if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSCAT) {
 309                                 struct nlattr *cat_loc;
 310                                 struct nlattr *cat_rem;
 311
 312                                 cat_loc = nla_find_nested(nla_a,
 313                                                      NLBL_CIPSOV4_A_MLSCATLOC);
 314                                 cat_rem = nla_find_nested(nla_a,
 315                                                      NLBL_CIPSOV4_A_MLSCATREM);
 316                                 if (cat_loc == NULL || cat_rem == NULL)
 317                                         goto add_std_failure;
 318                                 doi_def->map.std->cat.local[
 319                                                         nla_get_u32(cat_loc)] =
 320                                         nla_get_u32(cat_rem);
 321                                 doi_def->map.std->cat.cipso[
 322                                                         nla_get_u32(cat_rem)] =
 323                                         nla_get_u32(cat_loc);
 324                         }
 325         }
 326
 327         ret_val = cipso_v4_doi_add(doi_def);
 328         if (ret_val != 0)
 329                 goto add_std_failure;
 330         return 0;
 331
 332 add_std_failure:
 333         if (doi_def)
 334                 netlbl_cipsov4_doi_free(&doi_def->rcu);
 335         return ret_val;
 336 }
 337
 338 /**
 339  * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
 340  * @info: the Generic NETLINK info block
 341  *
 342  * Description:
 343  * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
 344  * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
 345  * error.
 346  *
 347  */
 348 static int netlbl_cipsov4_add_pass(struct genl_info *info)
 349 {
 350         int ret_val;
 351         struct cipso_v4_doi *doi_def = NULL;
 352
 353         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 354                 return -EINVAL;
 355
 356         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 357         if (doi_def == NULL)
 358                 return -ENOMEM;
 359         doi_def->type = CIPSO_V4_MAP_PASS;
 360
 361         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 362         if (ret_val != 0)
 363                 goto add_pass_failure;
 364
 365         ret_val = cipso_v4_doi_add(doi_def);
 366         if (ret_val != 0)
 367                 goto add_pass_failure;
 368         return 0;
 369
 370 add_pass_failure:
 371         netlbl_cipsov4_doi_free(&doi_def->rcu);
 372         return ret_val;
 373 }
 374
 375 /**
 376  * netlbl_cipsov4_add - Handle an ADD message
 377  * @skb: the NETLINK buffer
 378  * @info: the Generic NETLINK info block
 379  *
 380  * Description:
 381  * Create a new DOI definition based on the given ADD message and add it to the
 382  * CIPSO V4 engine.  Returns zero on success, negative values on failure.
 383  *
 384  */
 385 static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 386
 387 {
 388         int ret_val = -EINVAL;
 389         u32 type;
 390         u32 doi;
 391         const char *type_str = "(unknown)";
 392         struct audit_buffer *audit_buf;
 393         struct netlbl_audit audit_info;
 394
 395         if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
 396             !info->attrs[NLBL_CIPSOV4_A_MTYPE])
 397                 return -EINVAL;
 398
 399         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 400         netlbl_netlink_auditinfo(skb, &audit_info);
 401
 402         type = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE]);
 403         switch (type) {
 404         case CIPSO_V4_MAP_STD:
 405                 type_str = "std";
 406                 ret_val = netlbl_cipsov4_add_std(info);
 407                 break;
 408         case CIPSO_V4_MAP_PASS:
 409                 type_str = "pass";
 410                 ret_val = netlbl_cipsov4_add_pass(info);
 411                 break;
 412         }
 413
 414         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
 415                                               &audit_info);
 416         if (audit_buf != NULL) {
 417                 audit_log_format(audit_buf,
 418                                  " cipso_doi=%u cipso_type=%s res=%u",
 419                                  doi,
 420                                  type_str,
 421                                  ret_val == 0 ? 1 : 0);
 422                 audit_log_end(audit_buf);
 423         }
 424
 425         return ret_val;
 426 }
 427
 428 /**
 429  * netlbl_cipsov4_list - Handle a LIST message
 430  * @skb: the NETLINK buffer
 431  * @info: the Generic NETLINK info block
 432  *
 433  * Description:
 434  * Process a user generated LIST message and respond accordingly.  While the
 435  * response message generated by the kernel is straightforward, determining
 436  * before hand the size of the buffer to allocate is not (we have to generate
 437  * the message to know the size).  In order to keep this function sane what we
 438  * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
 439  * that size, if we fail then we restart with a larger buffer and try again.
 440  * We continue in this manner until we hit a limit of failed attempts then we
 441  * give up and just send an error message.  Returns zero on success and
 442  * negative values on error.
 443  *
 444  */
 445 static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
 446 {
 447         int ret_val;
 448         struct sk_buff *ans_skb = NULL;
 449         u32 nlsze_mult = 1;
 450         void *data;
 451         u32 doi;
 452         struct nlattr *nla_a;
 453         struct nlattr *nla_b;
 454         struct cipso_v4_doi *doi_def;
 455         u32 iter;
 456
 457         if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
 458                 ret_val = -EINVAL;
 459                 goto list_failure;
 460         }
 461
 462 list_start:
 463         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
 464         if (ans_skb == NULL) {
 465                 ret_val = -ENOMEM;
 466                 goto list_failure;
 467         }
 468         data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
 469                                  0, NLBL_CIPSOV4_C_LIST);
 470         if (data == NULL) {
 471                 ret_val = -ENOMEM;
 472                 goto list_failure;
 473         }
 474
 475         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 476
 477         rcu_read_lock();
 478         doi_def = cipso_v4_doi_getdef(doi);
 479         if (doi_def == NULL) {
 480                 ret_val = -EINVAL;
 481                 goto list_failure;
 482         }
 483
 484         ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
 485         if (ret_val != 0)
 486                 goto list_failure_lock;
 487
 488         nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
 489         if (nla_a == NULL) {
 490                 ret_val = -ENOMEM;
 491                 goto list_failure_lock;
 492         }
 493         for (iter = 0;
 494              iter < CIPSO_V4_TAG_MAXCNT &&
 495                doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
 496              iter++) {
 497                 ret_val = nla_put_u8(ans_skb,
 498                                      NLBL_CIPSOV4_A_TAG,
 499                                      doi_def->tags[iter]);
 500                 if (ret_val != 0)
 501                         goto list_failure_lock;
 502         }
 503         nla_nest_end(ans_skb, nla_a);
 504
 505         switch (doi_def->type) {
 506         case CIPSO_V4_MAP_STD:
 507                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
 508                 if (nla_a == NULL) {
 509                         ret_val = -ENOMEM;
 510                         goto list_failure_lock;
 511                 }
 512                 for (iter = 0;
 513                      iter < doi_def->map.std->lvl.local_size;
 514                      iter++) {
 515                         if (doi_def->map.std->lvl.local[iter] ==
 516                             CIPSO_V4_INV_LVL)
 517                                 continue;
 518
 519                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
 520                         if (nla_b == NULL) {
 521                                 ret_val = -ENOMEM;
 522                                 goto list_retry;
 523                         }
 524                         ret_val = nla_put_u32(ans_skb,
 525                                               NLBL_CIPSOV4_A_MLSLVLLOC,
 526                                               iter);
 527                         if (ret_val != 0)
 528                                 goto list_retry;
 529                         ret_val = nla_put_u32(ans_skb,
 530                                             NLBL_CIPSOV4_A_MLSLVLREM,
 531                                             doi_def->map.std->lvl.local[iter]);
 532                         if (ret_val != 0)
 533                                 goto list_retry;
 534                         nla_nest_end(ans_skb, nla_b);
 535                 }
 536                 nla_nest_end(ans_skb, nla_a);
 537
 538                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
 539                 if (nla_a == NULL) {
 540                         ret_val = -ENOMEM;
 541                         goto list_retry;
 542                 }
 543                 for (iter = 0;
 544                      iter < doi_def->map.std->cat.local_size;
 545                      iter++) {
 546                         if (doi_def->map.std->cat.local[iter] ==
 547                             CIPSO_V4_INV_CAT)
 548                                 continue;
 549
 550                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
 551                         if (nla_b == NULL) {
 552                                 ret_val = -ENOMEM;
 553                                 goto list_retry;
 554                         }
 555                         ret_val = nla_put_u32(ans_skb,
 556                                               NLBL_CIPSOV4_A_MLSCATLOC,
 557                                               iter);
 558                         if (ret_val != 0)
 559                                 goto list_retry;
 560                         ret_val = nla_put_u32(ans_skb,
 561                                             NLBL_CIPSOV4_A_MLSCATREM,
 562                                             doi_def->map.std->cat.local[iter]);
 563                         if (ret_val != 0)
 564                                 goto list_retry;
 565                         nla_nest_end(ans_skb, nla_b);
 566                 }
 567                 nla_nest_end(ans_skb, nla_a);
 568
 569                 break;
 570         }
 571         rcu_read_unlock();
 572
 573         genlmsg_end(ans_skb, data);
 574
 575         ret_val = genlmsg_reply(ans_skb, info);
 576         if (ret_val != 0)
 577                 goto list_failure;
 578
 579         return 0;
 580
 581 list_retry:
 582         /* XXX - this limit is a guesstimate */
 583         if (nlsze_mult < 4) {
 584                 rcu_read_unlock();
 585                 kfree_skb(ans_skb);
 586                 nlsze_mult++;
 587                 goto list_start;
 588         }
 589 list_failure_lock:
 590         rcu_read_unlock();
 591 list_failure:
 592         kfree_skb(ans_skb);
 593         return ret_val;
 594 }
 595
 596 /**
 597  * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
 598  * @doi_def: the CIPSOv4 DOI definition
 599  * @arg: the netlbl_cipsov4_doiwalk_arg structure
 600  *
 601  * Description:
 602  * This function is designed to be used as a callback to the
 603  * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
 604  * message.  Returns the size of the message on success, negative values on
 605  * failure.
 606  *
 607  */
 608 static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
 609 {
 610         int ret_val = -ENOMEM;
 611         struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
 612         void *data;
 613
 614         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
 615                            cb_arg->seq, &netlbl_cipsov4_gnl_family,
 616                            NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
 617         if (data == NULL)
 618                 goto listall_cb_failure;
 619
 620         ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
 621         if (ret_val != 0)
 622                 goto listall_cb_failure;
 623         ret_val = nla_put_u32(cb_arg->skb,
 624                               NLBL_CIPSOV4_A_MTYPE,
 625                               doi_def->type);
 626         if (ret_val != 0)
 627                 goto listall_cb_failure;
 628
 629         return genlmsg_end(cb_arg->skb, data);
 630
 631 listall_cb_failure:
 632         genlmsg_cancel(cb_arg->skb, data);
 633         return ret_val;
 634 }
 635
 636 /**
 637  * netlbl_cipsov4_listall - Handle a LISTALL message
 638  * @skb: the NETLINK buffer
 639  * @cb: the NETLINK callback
 640  *
 641  * Description:
 642  * Process a user generated LISTALL message and respond accordingly.  Returns
 643  * zero on success and negative values on error.
 644  *
 645  */
 646 static int netlbl_cipsov4_listall(struct sk_buff *skb,
 647                                   struct netlink_callback *cb)
 648 {
 649         struct netlbl_cipsov4_doiwalk_arg cb_arg;
 650         int doi_skip = cb->args[0];
 651
 652         cb_arg.nl_cb = cb;
 653         cb_arg.skb = skb;
 654         cb_arg.seq = cb->nlh->nlmsg_seq;
 655
 656         cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
 657
 658         cb->args[0] = doi_skip;
 659         return skb->len;
 660 }
 661
 662 /**
 663  * netlbl_cipsov4_remove - Handle a REMOVE message
 664  * @skb: the NETLINK buffer
 665  * @info: the Generic NETLINK info block
 666  *
 667  * Description:
 668  * Process a user generated REMOVE message and respond accordingly.  Returns
 669  * zero on success, negative values on failure.
 670  *
 671  */
 672 static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 673 {
 674         int ret_val = -EINVAL;
 675         u32 doi = 0;
 676         struct audit_buffer *audit_buf;
 677         struct netlbl_audit audit_info;
 678
 679         if (!info->attrs[NLBL_CIPSOV4_A_DOI])
 680                 return -EINVAL;
 681
 682         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 683         netlbl_netlink_auditinfo(skb, &audit_info);
 684
 685         ret_val = cipso_v4_doi_remove(doi,
 686                                       &audit_info,
 687                                       netlbl_cipsov4_doi_free);
 688
 689         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
 690                                               &audit_info);
 691         if (audit_buf != NULL) {
 692                 audit_log_format(audit_buf,
 693                                  " cipso_doi=%u res=%u",
 694                                  doi,
 695                                  ret_val == 0 ? 1 : 0);
 696                 audit_log_end(audit_buf);
 697         }
 698
 699         return ret_val;
 700 }
 701
 702 /*
 703  * NetLabel Generic NETLINK Command Definitions
 704  */
 705
 706 static struct genl_ops netlbl_cipsov4_genl_c_add = {
 707         .cmd = NLBL_CIPSOV4_C_ADD,
 708         .flags = GENL_ADMIN_PERM,
 709         .policy = netlbl_cipsov4_genl_policy,
 710         .doit = netlbl_cipsov4_add,
 711         .dumpit = NULL,
 712 };
 713
 714 static struct genl_ops netlbl_cipsov4_genl_c_remove = {
 715         .cmd = NLBL_CIPSOV4_C_REMOVE,
 716         .flags = GENL_ADMIN_PERM,
 717         .policy = netlbl_cipsov4_genl_policy,
 718         .doit = netlbl_cipsov4_remove,
 719         .dumpit = NULL,
 720 };
 721
 722 static struct genl_ops netlbl_cipsov4_genl_c_list = {
 723         .cmd = NLBL_CIPSOV4_C_LIST,
 724         .flags = 0,
 725         .policy = netlbl_cipsov4_genl_policy,
 726         .doit = netlbl_cipsov4_list,
 727         .dumpit = NULL,
 728 };
 729
 730 static struct genl_ops netlbl_cipsov4_genl_c_listall = {
 731         .cmd = NLBL_CIPSOV4_C_LISTALL,
 732         .flags = 0,
 733         .policy = netlbl_cipsov4_genl_policy,
 734         .doit = NULL,
 735         .dumpit = netlbl_cipsov4_listall,
 736 };
 737
 738 /*
 739  * NetLabel Generic NETLINK Protocol Functions
 740  */
 741
 742 /**
 743  * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
 744  *
 745  * Description:
 746  * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
 747  * mechanism.  Returns zero on success, negative values on failure.
 748  *
 749  */
 750 int netlbl_cipsov4_genl_init(void)
 751 {
 752         int ret_val;
 753
 754         ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
 755         if (ret_val != 0)
 756                 return ret_val;
 757
 758         ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 759                                     &netlbl_cipsov4_genl_c_add);
 760         if (ret_val != 0)
 761                 return ret_val;
 762         ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 763                                     &netlbl_cipsov4_genl_c_remove);
 764         if (ret_val != 0)
 765                 return ret_val;
 766         ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 767                                     &netlbl_cipsov4_genl_c_list);
 768         if (ret_val != 0)
 769                 return ret_val;
 770         ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 771                                     &netlbl_cipsov4_genl_c_listall);
 772         if (ret_val != 0)
 773                 return ret_val;
 774
 775         return 0;
 776 }