git.oblomov.eu Git - linux-2.6/blob - 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 #include <asm/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         if (doi_def)
 328                 cipso_v4_doi_free(doi_def);
 329         return ret_val;
 330 }
 331
 332 /**
 333  * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
 334  * @info: the Generic NETLINK info block
 335  * @audit_info: NetLabel audit information
 336  *
 337  * Description:
 338  * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
 339  * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
 340  * error.
 341  *
 342  */
 343 static int netlbl_cipsov4_add_pass(struct genl_info *info,
 344                                    struct netlbl_audit *audit_info)
 345 {
 346         int ret_val;
 347         struct cipso_v4_doi *doi_def = NULL;
 348
 349         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 350                 return -EINVAL;
 351
 352         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 353         if (doi_def == NULL)
 354                 return -ENOMEM;
 355         doi_def->type = CIPSO_V4_MAP_PASS;
 356
 357         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 358         if (ret_val != 0)
 359                 goto add_pass_failure;
 360
 361         ret_val = cipso_v4_doi_add(doi_def, audit_info);
 362         if (ret_val != 0)
 363                 goto add_pass_failure;
 364         return 0;
 365
 366 add_pass_failure:
 367         cipso_v4_doi_free(doi_def);
 368         return ret_val;
 369 }
 370
 371 /**
 372  * netlbl_cipsov4_add_local - Adds a CIPSO V4 DOI definition
 373  * @info: the Generic NETLINK info block
 374  * @audit_info: NetLabel audit information
 375  *
 376  * Description:
 377  * Create a new CIPSO_V4_MAP_LOCAL DOI definition based on the given ADD
 378  * message and add it to the CIPSO V4 engine.  Return zero on success and
 379  * non-zero on error.
 380  *
 381  */
 382 static int netlbl_cipsov4_add_local(struct genl_info *info,
 383                                     struct netlbl_audit *audit_info)
 384 {
 385         int ret_val;
 386         struct cipso_v4_doi *doi_def = NULL;
 387
 388         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 389                 return -EINVAL;
 390
 391         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 392         if (doi_def == NULL)
 393                 return -ENOMEM;
 394         doi_def->type = CIPSO_V4_MAP_LOCAL;
 395
 396         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 397         if (ret_val != 0)
 398                 goto add_local_failure;
 399
 400         ret_val = cipso_v4_doi_add(doi_def, audit_info);
 401         if (ret_val != 0)
 402                 goto add_local_failure;
 403         return 0;
 404
 405 add_local_failure:
 406         cipso_v4_doi_free(doi_def);
 407         return ret_val;
 408 }
 409
 410 /**
 411  * netlbl_cipsov4_add - Handle an ADD message
 412  * @skb: the NETLINK buffer
 413  * @info: the Generic NETLINK info block
 414  *
 415  * Description:
 416  * Create a new DOI definition based on the given ADD message and add it to the
 417  * CIPSO V4 engine.  Returns zero on success, negative values on failure.
 418  *
 419  */
 420 static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 421
 422 {
 423         int ret_val = -EINVAL;
 424         const char *type_str = "(unknown)";
 425         struct netlbl_audit audit_info;
 426
 427         if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
 428             !info->attrs[NLBL_CIPSOV4_A_MTYPE])
 429                 return -EINVAL;
 430
 431         netlbl_netlink_auditinfo(skb, &audit_info);
 432         switch (nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE])) {
 433         case CIPSO_V4_MAP_TRANS:
 434                 type_str = "trans";
 435                 ret_val = netlbl_cipsov4_add_std(info, &audit_info);
 436                 break;
 437         case CIPSO_V4_MAP_PASS:
 438                 type_str = "pass";
 439                 ret_val = netlbl_cipsov4_add_pass(info, &audit_info);
 440                 break;
 441         case CIPSO_V4_MAP_LOCAL:
 442                 type_str = "local";
 443                 ret_val = netlbl_cipsov4_add_local(info, &audit_info);
 444                 break;
 445         }
 446         if (ret_val == 0)
 447                 atomic_inc(&netlabel_mgmt_protocount);
 448
 449         return ret_val;
 450 }
 451
 452 /**
 453  * netlbl_cipsov4_list - Handle a LIST message
 454  * @skb: the NETLINK buffer
 455  * @info: the Generic NETLINK info block
 456  *
 457  * Description:
 458  * Process a user generated LIST message and respond accordingly.  While the
 459  * response message generated by the kernel is straightforward, determining
 460  * before hand the size of the buffer to allocate is not (we have to generate
 461  * the message to know the size).  In order to keep this function sane what we
 462  * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
 463  * that size, if we fail then we restart with a larger buffer and try again.
 464  * We continue in this manner until we hit a limit of failed attempts then we
 465  * give up and just send an error message.  Returns zero on success and
 466  * negative values on error.
 467  *
 468  */
 469 static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
 470 {
 471         int ret_val;
 472         struct sk_buff *ans_skb = NULL;
 473         u32 nlsze_mult = 1;
 474         void *data;
 475         u32 doi;
 476         struct nlattr *nla_a;
 477         struct nlattr *nla_b;
 478         struct cipso_v4_doi *doi_def;
 479         u32 iter;
 480
 481         if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
 482                 ret_val = -EINVAL;
 483                 goto list_failure;
 484         }
 485
 486 list_start:
 487         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
 488         if (ans_skb == NULL) {
 489                 ret_val = -ENOMEM;
 490                 goto list_failure;
 491         }
 492         data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
 493                                  0, NLBL_CIPSOV4_C_LIST);
 494         if (data == NULL) {
 495                 ret_val = -ENOMEM;
 496                 goto list_failure;
 497         }
 498
 499         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 500
 501         rcu_read_lock();
 502         doi_def = cipso_v4_doi_getdef(doi);
 503         if (doi_def == NULL) {
 504                 ret_val = -EINVAL;
 505                 goto list_failure_lock;
 506         }
 507
 508         ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
 509         if (ret_val != 0)
 510                 goto list_failure_lock;
 511
 512         nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
 513         if (nla_a == NULL) {
 514                 ret_val = -ENOMEM;
 515                 goto list_failure_lock;
 516         }
 517         for (iter = 0;
 518              iter < CIPSO_V4_TAG_MAXCNT &&
 519                doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
 520              iter++) {
 521                 ret_val = nla_put_u8(ans_skb,
 522                                      NLBL_CIPSOV4_A_TAG,
 523                                      doi_def->tags[iter]);
 524                 if (ret_val != 0)
 525                         goto list_failure_lock;
 526         }
 527         nla_nest_end(ans_skb, nla_a);
 528
 529         switch (doi_def->type) {
 530         case CIPSO_V4_MAP_TRANS:
 531                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
 532                 if (nla_a == NULL) {
 533                         ret_val = -ENOMEM;
 534                         goto list_failure_lock;
 535                 }
 536                 for (iter = 0;
 537                      iter < doi_def->map.std->lvl.local_size;
 538                      iter++) {
 539                         if (doi_def->map.std->lvl.local[iter] ==
 540                             CIPSO_V4_INV_LVL)
 541                                 continue;
 542
 543                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
 544                         if (nla_b == NULL) {
 545                                 ret_val = -ENOMEM;
 546                                 goto list_retry;
 547                         }
 548                         ret_val = nla_put_u32(ans_skb,
 549                                               NLBL_CIPSOV4_A_MLSLVLLOC,
 550                                               iter);
 551                         if (ret_val != 0)
 552                                 goto list_retry;
 553                         ret_val = nla_put_u32(ans_skb,
 554                                             NLBL_CIPSOV4_A_MLSLVLREM,
 555                                             doi_def->map.std->lvl.local[iter]);
 556                         if (ret_val != 0)
 557                                 goto list_retry;
 558                         nla_nest_end(ans_skb, nla_b);
 559                 }
 560                 nla_nest_end(ans_skb, nla_a);
 561
 562                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
 563                 if (nla_a == NULL) {
 564                         ret_val = -ENOMEM;
 565                         goto list_retry;
 566                 }
 567                 for (iter = 0;
 568                      iter < doi_def->map.std->cat.local_size;
 569                      iter++) {
 570                         if (doi_def->map.std->cat.local[iter] ==
 571                             CIPSO_V4_INV_CAT)
 572                                 continue;
 573
 574                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
 575                         if (nla_b == NULL) {
 576                                 ret_val = -ENOMEM;
 577                                 goto list_retry;
 578                         }
 579                         ret_val = nla_put_u32(ans_skb,
 580                                               NLBL_CIPSOV4_A_MLSCATLOC,
 581                                               iter);
 582                         if (ret_val != 0)
 583                                 goto list_retry;
 584                         ret_val = nla_put_u32(ans_skb,
 585                                             NLBL_CIPSOV4_A_MLSCATREM,
 586                                             doi_def->map.std->cat.local[iter]);
 587                         if (ret_val != 0)
 588                                 goto list_retry;
 589                         nla_nest_end(ans_skb, nla_b);
 590                 }
 591                 nla_nest_end(ans_skb, nla_a);
 592
 593                 break;
 594         }
 595         rcu_read_unlock();
 596
 597         genlmsg_end(ans_skb, data);
 598         return genlmsg_reply(ans_skb, info);
 599
 600 list_retry:
 601         /* XXX - this limit is a guesstimate */
 602         if (nlsze_mult < 4) {
 603                 rcu_read_unlock();
 604                 kfree_skb(ans_skb);
 605                 nlsze_mult *= 2;
 606                 goto list_start;
 607         }
 608 list_failure_lock:
 609         rcu_read_unlock();
 610 list_failure:
 611         kfree_skb(ans_skb);
 612         return ret_val;
 613 }
 614
 615 /**
 616  * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
 617  * @doi_def: the CIPSOv4 DOI definition
 618  * @arg: the netlbl_cipsov4_doiwalk_arg structure
 619  *
 620  * Description:
 621  * This function is designed to be used as a callback to the
 622  * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
 623  * message.  Returns the size of the message on success, negative values on
 624  * failure.
 625  *
 626  */
 627 static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
 628 {
 629         int ret_val = -ENOMEM;
 630         struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
 631         void *data;
 632
 633         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
 634                            cb_arg->seq, &netlbl_cipsov4_gnl_family,
 635                            NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
 636         if (data == NULL)
 637                 goto listall_cb_failure;
 638
 639         ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
 640         if (ret_val != 0)
 641                 goto listall_cb_failure;
 642         ret_val = nla_put_u32(cb_arg->skb,
 643                               NLBL_CIPSOV4_A_MTYPE,
 644                               doi_def->type);
 645         if (ret_val != 0)
 646                 goto listall_cb_failure;
 647
 648         return genlmsg_end(cb_arg->skb, data);
 649
 650 listall_cb_failure:
 651         genlmsg_cancel(cb_arg->skb, data);
 652         return ret_val;
 653 }
 654
 655 /**
 656  * netlbl_cipsov4_listall - Handle a LISTALL message
 657  * @skb: the NETLINK buffer
 658  * @cb: the NETLINK callback
 659  *
 660  * Description:
 661  * Process a user generated LISTALL message and respond accordingly.  Returns
 662  * zero on success and negative values on error.
 663  *
 664  */
 665 static int netlbl_cipsov4_listall(struct sk_buff *skb,
 666                                   struct netlink_callback *cb)
 667 {
 668         struct netlbl_cipsov4_doiwalk_arg cb_arg;
 669         u32 doi_skip = cb->args[0];
 670
 671         cb_arg.nl_cb = cb;
 672         cb_arg.skb = skb;
 673         cb_arg.seq = cb->nlh->nlmsg_seq;
 674
 675         cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
 676
 677         cb->args[0] = doi_skip;
 678         return skb->len;
 679 }
 680
 681 /**
 682  * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
 683  * @entry: LSM domain mapping entry
 684  * @arg: the netlbl_domhsh_walk_arg structure
 685  *
 686  * Description:
 687  * This function is intended for use by netlbl_cipsov4_remove() as the callback
 688  * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
 689  * which are associated with the CIPSO DOI specified in @arg.  Returns zero on
 690  * success, negative values on failure.
 691  *
 692  */
 693 static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
 694 {
 695         struct netlbl_domhsh_walk_arg *cb_arg = arg;
 696
 697         if (entry->type == NETLBL_NLTYPE_CIPSOV4 &&
 698             entry->type_def.cipsov4->doi == cb_arg->doi)
 699                 return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
 700
 701         return 0;
 702 }
 703
 704 /**
 705  * netlbl_cipsov4_remove - Handle a REMOVE message
 706  * @skb: the NETLINK buffer
 707  * @info: the Generic NETLINK info block
 708  *
 709  * Description:
 710  * Process a user generated REMOVE message and respond accordingly.  Returns
 711  * zero on success, negative values on failure.
 712  *
 713  */
 714 static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 715 {
 716         int ret_val = -EINVAL;
 717         struct netlbl_domhsh_walk_arg cb_arg;
 718         struct netlbl_audit audit_info;
 719         u32 skip_bkt = 0;
 720         u32 skip_chain = 0;
 721
 722         if (!info->attrs[NLBL_CIPSOV4_A_DOI])
 723                 return -EINVAL;
 724
 725         netlbl_netlink_auditinfo(skb, &audit_info);
 726         cb_arg.doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 727         cb_arg.audit_info = &audit_info;
 728         ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
 729                                      netlbl_cipsov4_remove_cb, &cb_arg);
 730         if (ret_val == 0 || ret_val == -ENOENT) {
 731                 ret_val = cipso_v4_doi_remove(cb_arg.doi, &audit_info);
 732                 if (ret_val == 0)
 733                         atomic_dec(&netlabel_mgmt_protocount);
 734         }
 735
 736         return ret_val;
 737 }
 738
 739 /*
 740  * NetLabel Generic NETLINK Command Definitions
 741  */
 742
 743 static struct genl_ops netlbl_cipsov4_ops[] = {
 744         {
 745         .cmd = NLBL_CIPSOV4_C_ADD,
 746         .flags = GENL_ADMIN_PERM,
 747         .policy = netlbl_cipsov4_genl_policy,
 748         .doit = netlbl_cipsov4_add,
 749         .dumpit = NULL,
 750         },
 751         {
 752         .cmd = NLBL_CIPSOV4_C_REMOVE,
 753         .flags = GENL_ADMIN_PERM,
 754         .policy = netlbl_cipsov4_genl_policy,
 755         .doit = netlbl_cipsov4_remove,
 756         .dumpit = NULL,
 757         },
 758         {
 759         .cmd = NLBL_CIPSOV4_C_LIST,
 760         .flags = 0,
 761         .policy = netlbl_cipsov4_genl_policy,
 762         .doit = netlbl_cipsov4_list,
 763         .dumpit = NULL,
 764         },
 765         {
 766         .cmd = NLBL_CIPSOV4_C_LISTALL,
 767         .flags = 0,
 768         .policy = netlbl_cipsov4_genl_policy,
 769         .doit = NULL,
 770         .dumpit = netlbl_cipsov4_listall,
 771         },
 772 };
 773
 774 /*
 775  * NetLabel Generic NETLINK Protocol Functions
 776  */
 777
 778 /**
 779  * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
 780  *
 781  * Description:
 782  * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
 783  * mechanism.  Returns zero on success, negative values on failure.
 784  *
 785  */
 786 int __init netlbl_cipsov4_genl_init(void)
 787 {
 788         int ret_val, i;
 789
 790         ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
 791         if (ret_val != 0)
 792                 return ret_val;
 793
 794         for (i = 0; i < ARRAY_SIZE(netlbl_cipsov4_ops); i++) {
 795                 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 796                                 &netlbl_cipsov4_ops[i]);
 797                 if (ret_val != 0)
 798                         return ret_val;
 799         }
 800
 801         return 0;
 802 }