kernel/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@paul-moore.com>
   9  *
  10  */
  11
  12 /*
  13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
  14  *
  15  * This program is free software;  you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  23  * the GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program;  if not, see <http://www.gnu.org/licenses/>.
  27  *
  28  */
  29
  30 #include <linux/types.h>
  31 #include <linux/socket.h>
  32 #include <linux/string.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/audit.h>
  35 #include <linux/slab.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 #include <linux/atomic.h>
  42
  43 #include "netlabel_user.h"
  44 #include "netlabel_cipso_v4.h"
  45 #include "netlabel_mgmt.h"
  46 #include "netlabel_domainhash.h"
  47
  48 /* Argument struct for cipso_v4_doi_walk() */
  49 struct netlbl_cipsov4_doiwalk_arg {
  50         struct netlink_callback *nl_cb;
  51         struct sk_buff *skb;
  52         u32 seq;
  53 };
  54
  55 /* Argument struct for netlbl_domhsh_walk() */
  56 struct netlbl_domhsh_walk_arg {
  57         struct netlbl_audit *audit_info;
  58         u32 doi;
  59 };
  60
  61 /* NetLabel Generic NETLINK CIPSOv4 family */
  62 static struct genl_family netlbl_cipsov4_gnl_family = {
  63         .id = GENL_ID_GENERATE,
  64         .hdrsize = 0,
  65         .name = NETLBL_NLTYPE_CIPSOV4_NAME,
  66         .version = NETLBL_PROTO_VERSION,
  67         .maxattr = NLBL_CIPSOV4_A_MAX,
  68 };
  69
  70 /* NetLabel Netlink attribute policy */
  71 static const struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
  72         [NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
  73         [NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
  74         [NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
  75         [NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
  76         [NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
  77         [NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
  78         [NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
  79         [NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
  80         [NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
  81         [NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
  82         [NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
  83         [NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
  84 };
  85
  86 /*
  87  * Helper Functions
  88  */
  89
  90 /**
  91  * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
  92  * @info: the Generic NETLINK info block
  93  * @doi_def: the CIPSO V4 DOI definition
  94  *
  95  * Description:
  96  * Parse the common sections of a ADD message and fill in the related values
  97  * in @doi_def.  Returns zero on success, negative values on failure.
  98  *
  99  */
 100 static int netlbl_cipsov4_add_common(struct genl_info *info,
 101                                      struct cipso_v4_doi *doi_def)
 102 {
 103         struct nlattr *nla;
 104         int nla_rem;
 105         u32 iter = 0;
 106
 107         doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 108
 109         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
 110                                 NLBL_CIPSOV4_A_MAX,
 111                                 netlbl_cipsov4_genl_policy) != 0)
 112                 return -EINVAL;
 113
 114         nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
 115                 if (nla_type(nla) == NLBL_CIPSOV4_A_TAG) {
 116                         if (iter >= CIPSO_V4_TAG_MAXCNT)
 117                                 return -EINVAL;
 118                         doi_def->tags[iter++] = nla_get_u8(nla);
 119                 }
 120         while (iter < CIPSO_V4_TAG_MAXCNT)
 121                 doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID;
 122
 123         return 0;
 124 }
 125
 126 /*
 127  * NetLabel Command Handlers
 128  */
 129
 130 /**
 131  * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
 132  * @info: the Generic NETLINK info block
 133  * @audit_info: NetLabel audit information
 134  *
 135  * Description:
 136  * Create a new CIPSO_V4_MAP_TRANS DOI definition based on the given ADD
 137  * message and add it to the CIPSO V4 engine.  Return zero on success and
 138  * non-zero on error.
 139  *
 140  */
 141 static int netlbl_cipsov4_add_std(struct genl_info *info,
 142                                   struct netlbl_audit *audit_info)
 143 {
 144         int ret_val = -EINVAL;
 145         struct cipso_v4_doi *doi_def = NULL;
 146         struct nlattr *nla_a;
 147         struct nlattr *nla_b;
 148         int nla_a_rem;
 149         int nla_b_rem;
 150         u32 iter;
 151
 152         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
 153             !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
 154                 return -EINVAL;
 155
 156         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 157                                 NLBL_CIPSOV4_A_MAX,
 158                                 netlbl_cipsov4_genl_policy) != 0)
 159                 return -EINVAL;
 160
 161         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 162         if (doi_def == NULL)
 163                 return -ENOMEM;
 164         doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
 165         if (doi_def->map.std == NULL) {
 166                 ret_val = -ENOMEM;
 167                 goto add_std_failure;
 168         }
 169         doi_def->type = CIPSO_V4_MAP_TRANS;
 170
 171         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 172         if (ret_val != 0)
 173                 goto add_std_failure;
 174         ret_val = -EINVAL;
 175
 176         nla_for_each_nested(nla_a,
 177                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 178                             nla_a_rem)
 179                 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
 180                         if (nla_validate_nested(nla_a,
 181                                             NLBL_CIPSOV4_A_MAX,
 182                                             netlbl_cipsov4_genl_policy) != 0)
 183                                         goto add_std_failure;
 184                         nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 185                                 switch (nla_type(nla_b)) {
 186                                 case NLBL_CIPSOV4_A_MLSLVLLOC:
 187                                         if (nla_get_u32(nla_b) >
 188                                             CIPSO_V4_MAX_LOC_LVLS)
 189                                                 goto add_std_failure;
 190                                         if (nla_get_u32(nla_b) >=
 191                                             doi_def->map.std->lvl.local_size)
 192                                              doi_def->map.std->lvl.local_size =
 193                                                      nla_get_u32(nla_b) + 1;
 194                                         break;
 195                                 case NLBL_CIPSOV4_A_MLSLVLREM:
 196                                         if (nla_get_u32(nla_b) >
 197                                             CIPSO_V4_MAX_REM_LVLS)
 198                                                 goto add_std_failure;
 199                                         if (nla_get_u32(nla_b) >=
 200                                             doi_def->map.std->lvl.cipso_size)
 201                                              doi_def->map.std->lvl.cipso_size =
 202                                                      nla_get_u32(nla_b) + 1;
 203                                         break;
 204                                 }
 205                 }
 206         doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
 207                                               sizeof(u32),
 208                                               GFP_KERNEL);
 209         if (doi_def->map.std->lvl.local == NULL) {
 210                 ret_val = -ENOMEM;
 211                 goto add_std_failure;
 212         }
 213         doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
 214                                               sizeof(u32),
 215                                               GFP_KERNEL);
 216         if (doi_def->map.std->lvl.cipso == NULL) {
 217                 ret_val = -ENOMEM;
 218                 goto add_std_failure;
 219         }
 220         for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
 221                 doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
 222         for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
 223                 doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
 224         nla_for_each_nested(nla_a,
 225                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 226                             nla_a_rem)
 227                 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
 228                         struct nlattr *lvl_loc;
 229                         struct nlattr *lvl_rem;
 230
 231                         lvl_loc = nla_find_nested(nla_a,
 232                                                   NLBL_CIPSOV4_A_MLSLVLLOC);
 233                         lvl_rem = nla_find_nested(nla_a,
 234                                                   NLBL_CIPSOV4_A_MLSLVLREM);
 235                         if (lvl_loc == NULL || lvl_rem == NULL)
 236                                 goto add_std_failure;
 237                         doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
 238                                 nla_get_u32(lvl_rem);
 239                         doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
 240                                 nla_get_u32(lvl_loc);
 241                 }
 242
 243         if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
 244                 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 245                                         NLBL_CIPSOV4_A_MAX,
 246                                         netlbl_cipsov4_genl_policy) != 0)
 247                         goto add_std_failure;
 248
 249                 nla_for_each_nested(nla_a,
 250                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 251                                     nla_a_rem)
 252                         if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 253                                 if (nla_validate_nested(nla_a,
 254                                               NLBL_CIPSOV4_A_MAX,
 255                                               netlbl_cipsov4_genl_policy) != 0)
 256                                         goto add_std_failure;
 257                                 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 258                                         switch (nla_type(nla_b)) {
 259                                         case NLBL_CIPSOV4_A_MLSCATLOC:
 260                                                 if (nla_get_u32(nla_b) >
 261                                                     CIPSO_V4_MAX_LOC_CATS)
 262                                                         goto add_std_failure;
 263                                                 if (nla_get_u32(nla_b) >=
 264                                               doi_def->map.std->cat.local_size)
 265                                              doi_def->map.std->cat.local_size =
 266                                                      nla_get_u32(nla_b) + 1;
 267                                                 break;
 268                                         case NLBL_CIPSOV4_A_MLSCATREM:
 269                                                 if (nla_get_u32(nla_b) >
 270                                                     CIPSO_V4_MAX_REM_CATS)
 271                                                         goto add_std_failure;
 272                                                 if (nla_get_u32(nla_b) >=
 273                                               doi_def->map.std->cat.cipso_size)
 274                                              doi_def->map.std->cat.cipso_size =
 275                                                      nla_get_u32(nla_b) + 1;
 276                                                 break;
 277                                         }
 278                         }
 279                 doi_def->map.std->cat.local = kcalloc(
 280                                               doi_def->map.std->cat.local_size,
 281                                               sizeof(u32),
 282                                               GFP_KERNEL);
 283                 if (doi_def->map.std->cat.local == NULL) {
 284                         ret_val = -ENOMEM;
 285                         goto add_std_failure;
 286                 }
 287                 doi_def->map.std->cat.cipso = kcalloc(
 288                                               doi_def->map.std->cat.cipso_size,
 289                                               sizeof(u32),
 290                                               GFP_KERNEL);
 291                 if (doi_def->map.std->cat.cipso == NULL) {
 292                         ret_val = -ENOMEM;
 293                         goto add_std_failure;
 294                 }
 295                 for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
 296                         doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
 297                 for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
 298                         doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
 299                 nla_for_each_nested(nla_a,
 300                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 301                                     nla_a_rem)
 302                         if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 303                                 struct nlattr *cat_loc;
 304                                 struct nlattr *cat_rem;
 305
 306                                 cat_loc = nla_find_nested(nla_a,
 307                                                      NLBL_CIPSOV4_A_MLSCATLOC);
 308                                 cat_rem = nla_find_nested(nla_a,
 309                                                      NLBL_CIPSOV4_A_MLSCATREM);
 310                                 if (cat_loc == NULL || cat_rem == NULL)
 311                                         goto add_std_failure;
 312                                 doi_def->map.std->cat.local[
 313                                                         nla_get_u32(cat_loc)] =
 314                                         nla_get_u32(cat_rem);
 315                                 doi_def->map.std->cat.cipso[
 316                                                         nla_get_u32(cat_rem)] =
 317                                         nla_get_u32(cat_loc);
 318                         }
 319         }
 320
 321         ret_val = cipso_v4_doi_add(doi_def, audit_info);
 322         if (ret_val != 0)
 323                 goto add_std_failure;
 324         return 0;
 325
 326 add_std_failure:
 327         cipso_v4_doi_free(doi_def);
 328         return ret_val;
 329 }
 330
 331 /**
 332  * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
 333  * @info: the Generic NETLINK info block
 334  * @audit_info: NetLabel audit information
 335  *
 336  * Description:
 337  * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
 338  * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
 339  * error.
 340  *
 341  */
 342 static int netlbl_cipsov4_add_pass(struct genl_info *info,
 343                                    struct netlbl_audit *audit_info)
 344 {
 345         int ret_val;
 346         struct cipso_v4_doi *doi_def = NULL;
 347
 348         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 349                 return -EINVAL;
 350
 351         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 352         if (doi_def == NULL)
 353                 return -ENOMEM;
 354         doi_def->type = CIPSO_V4_MAP_PASS;
 355
 356         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 357         if (ret_val != 0)
 358                 goto add_pass_failure;
 359
 360         ret_val = cipso_v4_doi_add(doi_def, audit_info);
 361         if (ret_val != 0)
 362                 goto add_pass_failure;
 363         return 0;
 364
 365 add_pass_failure:
 366         cipso_v4_doi_free(doi_def);
 367         return ret_val;
 368 }
 369
 370 /**
 371  * netlbl_cipsov4_add_local - Adds a CIPSO V4 DOI definition
 372  * @info: the Generic NETLINK info block
 373  * @audit_info: NetLabel audit information
 374  *
 375  * Description:
 376  * Create a new CIPSO_V4_MAP_LOCAL DOI definition based on the given ADD
 377  * message and add it to the CIPSO V4 engine.  Return zero on success and
 378  * non-zero on error.
 379  *
 380  */
 381 static int netlbl_cipsov4_add_local(struct genl_info *info,
 382                                     struct netlbl_audit *audit_info)
 383 {
 384         int ret_val;
 385         struct cipso_v4_doi *doi_def = NULL;
 386
 387         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 388                 return -EINVAL;
 389
 390         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 391         if (doi_def == NULL)
 392                 return -ENOMEM;
 393         doi_def->type = CIPSO_V4_MAP_LOCAL;
 394
 395         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 396         if (ret_val != 0)
 397                 goto add_local_failure;
 398
 399         ret_val = cipso_v4_doi_add(doi_def, audit_info);
 400         if (ret_val != 0)
 401                 goto add_local_failure;
 402         return 0;
 403
 404 add_local_failure:
 405         cipso_v4_doi_free(doi_def);
 406         return ret_val;
 407 }
 408
 409 /**
 410  * netlbl_cipsov4_add - Handle an ADD message
 411  * @skb: the NETLINK buffer
 412  * @info: the Generic NETLINK info block
 413  *
 414  * Description:
 415  * Create a new DOI definition based on the given ADD message and add it to the
 416  * CIPSO V4 engine.  Returns zero on success, negative values on failure.
 417  *
 418  */
 419 static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 420
 421 {
 422         int ret_val = -EINVAL;
 423         struct netlbl_audit audit_info;
 424
 425         if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
 426             !info->attrs[NLBL_CIPSOV4_A_MTYPE])
 427                 return -EINVAL;
 428
 429         netlbl_netlink_auditinfo(skb, &audit_info);
 430         switch (nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE])) {
 431         case CIPSO_V4_MAP_TRANS:
 432                 ret_val = netlbl_cipsov4_add_std(info, &audit_info);
 433                 break;
 434         case CIPSO_V4_MAP_PASS:
 435                 ret_val = netlbl_cipsov4_add_pass(info, &audit_info);
 436                 break;
 437         case CIPSO_V4_MAP_LOCAL:
 438                 ret_val = netlbl_cipsov4_add_local(info, &audit_info);
 439                 break;
 440         }
 441         if (ret_val == 0)
 442                 atomic_inc(&netlabel_mgmt_protocount);
 443
 444         return ret_val;
 445 }
 446
 447 /**
 448  * netlbl_cipsov4_list - Handle a LIST message
 449  * @skb: the NETLINK buffer
 450  * @info: the Generic NETLINK info block
 451  *
 452  * Description:
 453  * Process a user generated LIST message and respond accordingly.  While the
 454  * response message generated by the kernel is straightforward, determining
 455  * before hand the size of the buffer to allocate is not (we have to generate
 456  * the message to know the size).  In order to keep this function sane what we
 457  * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
 458  * that size, if we fail then we restart with a larger buffer and try again.
 459  * We continue in this manner until we hit a limit of failed attempts then we
 460  * give up and just send an error message.  Returns zero on success and
 461  * negative values on error.
 462  *
 463  */
 464 static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
 465 {
 466         int ret_val;
 467         struct sk_buff *ans_skb = NULL;
 468         u32 nlsze_mult = 1;
 469         void *data;
 470         u32 doi;
 471         struct nlattr *nla_a;
 472         struct nlattr *nla_b;
 473         struct cipso_v4_doi *doi_def;
 474         u32 iter;
 475
 476         if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
 477                 ret_val = -EINVAL;
 478                 goto list_failure;
 479         }
 480
 481 list_start:
 482         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
 483         if (ans_skb == NULL) {
 484                 ret_val = -ENOMEM;
 485                 goto list_failure;
 486         }
 487         data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
 488                                  0, NLBL_CIPSOV4_C_LIST);
 489         if (data == NULL) {
 490                 ret_val = -ENOMEM;
 491                 goto list_failure;
 492         }
 493
 494         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 495
 496         rcu_read_lock();
 497         doi_def = cipso_v4_doi_getdef(doi);
 498         if (doi_def == NULL) {
 499                 ret_val = -EINVAL;
 500                 goto list_failure_lock;
 501         }
 502
 503         ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
 504         if (ret_val != 0)
 505                 goto list_failure_lock;
 506
 507         nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
 508         if (nla_a == NULL) {
 509                 ret_val = -ENOMEM;
 510                 goto list_failure_lock;
 511         }
 512         for (iter = 0;
 513              iter < CIPSO_V4_TAG_MAXCNT &&
 514                doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
 515              iter++) {
 516                 ret_val = nla_put_u8(ans_skb,
 517                                      NLBL_CIPSOV4_A_TAG,
 518                                      doi_def->tags[iter]);
 519                 if (ret_val != 0)
 520                         goto list_failure_lock;
 521         }
 522         nla_nest_end(ans_skb, nla_a);
 523
 524         switch (doi_def->type) {
 525         case CIPSO_V4_MAP_TRANS:
 526                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
 527                 if (nla_a == NULL) {
 528                         ret_val = -ENOMEM;
 529                         goto list_failure_lock;
 530                 }
 531                 for (iter = 0;
 532                      iter < doi_def->map.std->lvl.local_size;
 533                      iter++) {
 534                         if (doi_def->map.std->lvl.local[iter] ==
 535                             CIPSO_V4_INV_LVL)
 536                                 continue;
 537
 538                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
 539                         if (nla_b == NULL) {
 540                                 ret_val = -ENOMEM;
 541                                 goto list_retry;
 542                         }
 543                         ret_val = nla_put_u32(ans_skb,
 544                                               NLBL_CIPSOV4_A_MLSLVLLOC,
 545                                               iter);
 546                         if (ret_val != 0)
 547                                 goto list_retry;
 548                         ret_val = nla_put_u32(ans_skb,
 549                                             NLBL_CIPSOV4_A_MLSLVLREM,
 550                                             doi_def->map.std->lvl.local[iter]);
 551                         if (ret_val != 0)
 552                                 goto list_retry;
 553                         nla_nest_end(ans_skb, nla_b);
 554                 }
 555                 nla_nest_end(ans_skb, nla_a);
 556
 557                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
 558                 if (nla_a == NULL) {
 559                         ret_val = -ENOMEM;
 560                         goto list_retry;
 561                 }
 562                 for (iter = 0;
 563                      iter < doi_def->map.std->cat.local_size;
 564                      iter++) {
 565                         if (doi_def->map.std->cat.local[iter] ==
 566                             CIPSO_V4_INV_CAT)
 567                                 continue;
 568
 569                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
 570                         if (nla_b == NULL) {
 571                                 ret_val = -ENOMEM;
 572                                 goto list_retry;
 573                         }
 574                         ret_val = nla_put_u32(ans_skb,
 575                                               NLBL_CIPSOV4_A_MLSCATLOC,
 576                                               iter);
 577                         if (ret_val != 0)
 578                                 goto list_retry;
 579                         ret_val = nla_put_u32(ans_skb,
 580                                             NLBL_CIPSOV4_A_MLSCATREM,
 581                                             doi_def->map.std->cat.local[iter]);
 582                         if (ret_val != 0)
 583                                 goto list_retry;
 584                         nla_nest_end(ans_skb, nla_b);
 585                 }
 586                 nla_nest_end(ans_skb, nla_a);
 587
 588                 break;
 589         }
 590         rcu_read_unlock();
 591
 592         genlmsg_end(ans_skb, data);
 593         return genlmsg_reply(ans_skb, info);
 594
 595 list_retry:
 596         /* XXX - this limit is a guesstimate */
 597         if (nlsze_mult < 4) {
 598                 rcu_read_unlock();
 599                 kfree_skb(ans_skb);
 600                 nlsze_mult *= 2;
 601                 goto list_start;
 602         }
 603 list_failure_lock:
 604         rcu_read_unlock();
 605 list_failure:
 606         kfree_skb(ans_skb);
 607         return ret_val;
 608 }
 609
 610 /**
 611  * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
 612  * @doi_def: the CIPSOv4 DOI definition
 613  * @arg: the netlbl_cipsov4_doiwalk_arg structure
 614  *
 615  * Description:
 616  * This function is designed to be used as a callback to the
 617  * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
 618  * message.  Returns the size of the message on success, negative values on
 619  * failure.
 620  *
 621  */
 622 static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
 623 {
 624         int ret_val = -ENOMEM;
 625         struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
 626         void *data;
 627
 628         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
 629                            cb_arg->seq, &netlbl_cipsov4_gnl_family,
 630                            NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
 631         if (data == NULL)
 632                 goto listall_cb_failure;
 633
 634         ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
 635         if (ret_val != 0)
 636                 goto listall_cb_failure;
 637         ret_val = nla_put_u32(cb_arg->skb,
 638                               NLBL_CIPSOV4_A_MTYPE,
 639                               doi_def->type);
 640         if (ret_val != 0)
 641                 goto listall_cb_failure;
 642
 643         genlmsg_end(cb_arg->skb, data);
 644         return 0;
 645
 646 listall_cb_failure:
 647         genlmsg_cancel(cb_arg->skb, data);
 648         return ret_val;
 649 }
 650
 651 /**
 652  * netlbl_cipsov4_listall - Handle a LISTALL message
 653  * @skb: the NETLINK buffer
 654  * @cb: the NETLINK callback
 655  *
 656  * Description:
 657  * Process a user generated LISTALL message and respond accordingly.  Returns
 658  * zero on success and negative values on error.
 659  *
 660  */
 661 static int netlbl_cipsov4_listall(struct sk_buff *skb,
 662                                   struct netlink_callback *cb)
 663 {
 664         struct netlbl_cipsov4_doiwalk_arg cb_arg;
 665         u32 doi_skip = cb->args[0];
 666
 667         cb_arg.nl_cb = cb;
 668         cb_arg.skb = skb;
 669         cb_arg.seq = cb->nlh->nlmsg_seq;
 670
 671         cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
 672
 673         cb->args[0] = doi_skip;
 674         return skb->len;
 675 }
 676
 677 /**
 678  * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
 679  * @entry: LSM domain mapping entry
 680  * @arg: the netlbl_domhsh_walk_arg structure
 681  *
 682  * Description:
 683  * This function is intended for use by netlbl_cipsov4_remove() as the callback
 684  * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
 685  * which are associated with the CIPSO DOI specified in @arg.  Returns zero on
 686  * success, negative values on failure.
 687  *
 688  */
 689 static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
 690 {
 691         struct netlbl_domhsh_walk_arg *cb_arg = arg;
 692
 693         if (entry->def.type == NETLBL_NLTYPE_CIPSOV4 &&
 694             entry->def.cipso->doi == cb_arg->doi)
 695                 return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
 696
 697         return 0;
 698 }
 699
 700 /**
 701  * netlbl_cipsov4_remove - Handle a REMOVE message
 702  * @skb: the NETLINK buffer
 703  * @info: the Generic NETLINK info block
 704  *
 705  * Description:
 706  * Process a user generated REMOVE message and respond accordingly.  Returns
 707  * zero on success, negative values on failure.
 708  *
 709  */
 710 static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 711 {
 712         int ret_val = -EINVAL;
 713         struct netlbl_domhsh_walk_arg cb_arg;
 714         struct netlbl_audit audit_info;
 715         u32 skip_bkt = 0;
 716         u32 skip_chain = 0;
 717
 718         if (!info->attrs[NLBL_CIPSOV4_A_DOI])
 719                 return -EINVAL;
 720
 721         netlbl_netlink_auditinfo(skb, &audit_info);
 722         cb_arg.doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 723         cb_arg.audit_info = &audit_info;
 724         ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
 725                                      netlbl_cipsov4_remove_cb, &cb_arg);
 726         if (ret_val == 0 || ret_val == -ENOENT) {
 727                 ret_val = cipso_v4_doi_remove(cb_arg.doi, &audit_info);
 728                 if (ret_val == 0)
 729                         atomic_dec(&netlabel_mgmt_protocount);
 730         }
 731
 732         return ret_val;
 733 }
 734
 735 /*
 736  * NetLabel Generic NETLINK Command Definitions
 737  */
 738
 739 static const struct genl_ops netlbl_cipsov4_ops[] = {
 740         {
 741         .cmd = NLBL_CIPSOV4_C_ADD,
 742         .flags = GENL_ADMIN_PERM,
 743         .policy = netlbl_cipsov4_genl_policy,
 744         .doit = netlbl_cipsov4_add,
 745         .dumpit = NULL,
 746         },
 747         {
 748         .cmd = NLBL_CIPSOV4_C_REMOVE,
 749         .flags = GENL_ADMIN_PERM,
 750         .policy = netlbl_cipsov4_genl_policy,
 751         .doit = netlbl_cipsov4_remove,
 752         .dumpit = NULL,
 753         },
 754         {
 755         .cmd = NLBL_CIPSOV4_C_LIST,
 756         .flags = 0,
 757         .policy = netlbl_cipsov4_genl_policy,
 758         .doit = netlbl_cipsov4_list,
 759         .dumpit = NULL,
 760         },
 761         {
 762         .cmd = NLBL_CIPSOV4_C_LISTALL,
 763         .flags = 0,
 764         .policy = netlbl_cipsov4_genl_policy,
 765         .doit = NULL,
 766         .dumpit = netlbl_cipsov4_listall,
 767         },
 768 };
 769
 770 /*
 771  * NetLabel Generic NETLINK Protocol Functions
 772  */
 773
 774 /**
 775  * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
 776  *
 777  * Description:
 778  * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
 779  * mechanism.  Returns zero on success, negative values on failure.
 780  *
 781  */
 782 int __init netlbl_cipsov4_genl_init(void)
 783 {
 784         return genl_register_family_with_ops(&netlbl_cipsov4_gnl_family,
 785                                              netlbl_cipsov4_ops);
 786 }