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, 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 <linux/slab.h>
  37 #include <net/sock.h>
  38 #include <net/netlink.h>
  39 #include <net/genetlink.h>
  40 #include <net/netlabel.h>
  41 #include <net/cipso_ipv4.h>
  42 #include <linux/atomic.h>
  43
  44 #include "netlabel_user.h"
  45 #include "netlabel_cipso_v4.h"
  46 #include "netlabel_mgmt.h"
  47 #include "netlabel_domainhash.h"
  48
  49 /* Argument struct for cipso_v4_doi_walk() */
  50 struct netlbl_cipsov4_doiwalk_arg {
  51         struct netlink_callback *nl_cb;
  52         struct sk_buff *skb;
  53         u32 seq;
  54 };
  55
  56 /* Argument struct for netlbl_domhsh_walk() */
  57 struct netlbl_domhsh_walk_arg {
  58         struct netlbl_audit *audit_info;
  59         u32 doi;
  60 };
  61
  62 /* NetLabel Generic NETLINK CIPSOv4 family */
  63 static struct genl_family netlbl_cipsov4_gnl_family = {
  64         .id = GENL_ID_GENERATE,
  65         .hdrsize = 0,
  66         .name = NETLBL_NLTYPE_CIPSOV4_NAME,
  67         .version = NETLBL_PROTO_VERSION,
  68         .maxattr = NLBL_CIPSOV4_A_MAX,
  69 };
  70
  71 /* NetLabel Netlink attribute policy */
  72 static const struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
  73         [NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
  74         [NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
  75         [NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
  76         [NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
  77         [NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
  78         [NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
  79         [NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
  80         [NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
  81         [NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
  82         [NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
  83         [NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
  84         [NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
  85 };
  86
  87 /*
  88  * Helper Functions
  89  */
  90
  91 /**
  92  * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
  93  * @info: the Generic NETLINK info block
  94  * @doi_def: the CIPSO V4 DOI definition
  95  *
  96  * Description:
  97  * Parse the common sections of a ADD message and fill in the related values
  98  * in @doi_def.  Returns zero on success, negative values on failure.
  99  *
 100  */
 101 static int netlbl_cipsov4_add_common(struct genl_info *info,
 102                                      struct cipso_v4_doi *doi_def)
 103 {
 104         struct nlattr *nla;
 105         int nla_rem;
 106         u32 iter = 0;
 107
 108         doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 109
 110         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
 111                                 NLBL_CIPSOV4_A_MAX,
 112                                 netlbl_cipsov4_genl_policy) != 0)
 113                 return -EINVAL;
 114
 115         nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
 116                 if (nla_type(nla) == NLBL_CIPSOV4_A_TAG) {
 117                         if (iter >= CIPSO_V4_TAG_MAXCNT)
 118                                 return -EINVAL;
 119                         doi_def->tags[iter++] = nla_get_u8(nla);
 120                 }
 121         while (iter < CIPSO_V4_TAG_MAXCNT)
 122                 doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID;
 123
 124         return 0;
 125 }
 126
 127 /*
 128  * NetLabel Command Handlers
 129  */
 130
 131 /**
 132  * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
 133  * @info: the Generic NETLINK info block
 134  * @audit_info: NetLabel audit information
 135  *
 136  * Description:
 137  * Create a new CIPSO_V4_MAP_TRANS DOI definition based on the given ADD
 138  * message and add it to the CIPSO V4 engine.  Return zero on success and
 139  * non-zero on error.
 140  *
 141  */
 142 static int netlbl_cipsov4_add_std(struct genl_info *info,
 143                                   struct netlbl_audit *audit_info)
 144 {
 145         int ret_val = -EINVAL;
 146         struct cipso_v4_doi *doi_def = NULL;
 147         struct nlattr *nla_a;
 148         struct nlattr *nla_b;
 149         int nla_a_rem;
 150         int nla_b_rem;
 151         u32 iter;
 152
 153         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
 154             !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
 155                 return -EINVAL;
 156
 157         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 158                                 NLBL_CIPSOV4_A_MAX,
 159                                 netlbl_cipsov4_genl_policy) != 0)
 160                 return -EINVAL;
 161
 162         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 163         if (doi_def == NULL)
 164                 return -ENOMEM;
 165         doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
 166         if (doi_def->map.std == NULL) {
 167                 ret_val = -ENOMEM;
 168                 goto add_std_failure;
 169         }
 170         doi_def->type = CIPSO_V4_MAP_TRANS;
 171
 172         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 173         if (ret_val != 0)
 174                 goto add_std_failure;
 175         ret_val = -EINVAL;
 176
 177         nla_for_each_nested(nla_a,
 178                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 179                             nla_a_rem)
 180                 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
 181                         if (nla_validate_nested(nla_a,
 182                                             NLBL_CIPSOV4_A_MAX,
 183                                             netlbl_cipsov4_genl_policy) != 0)
 184                                         goto add_std_failure;
 185                         nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 186                                 switch (nla_type(nla_b)) {
 187                                 case NLBL_CIPSOV4_A_MLSLVLLOC:
 188                                         if (nla_get_u32(nla_b) >
 189                                             CIPSO_V4_MAX_LOC_LVLS)
 190                                                 goto add_std_failure;
 191                                         if (nla_get_u32(nla_b) >=
 192                                             doi_def->map.std->lvl.local_size)
 193                                              doi_def->map.std->lvl.local_size =
 194                                                      nla_get_u32(nla_b) + 1;
 195                                         break;
 196                                 case NLBL_CIPSOV4_A_MLSLVLREM:
 197                                         if (nla_get_u32(nla_b) >
 198                                             CIPSO_V4_MAX_REM_LVLS)
 199                                                 goto add_std_failure;
 200                                         if (nla_get_u32(nla_b) >=
 201                                             doi_def->map.std->lvl.cipso_size)
 202                                              doi_def->map.std->lvl.cipso_size =
 203                                                      nla_get_u32(nla_b) + 1;
 204                                         break;
 205                                 }
 206                 }
 207         doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
 208                                               sizeof(u32),
 209                                               GFP_KERNEL);
 210         if (doi_def->map.std->lvl.local == NULL) {
 211                 ret_val = -ENOMEM;
 212                 goto add_std_failure;
 213         }
 214         doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
 215                                               sizeof(u32),
 216                                               GFP_KERNEL);
 217         if (doi_def->map.std->lvl.cipso == NULL) {
 218                 ret_val = -ENOMEM;
 219                 goto add_std_failure;
 220         }
 221         for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
 222                 doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
 223         for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
 224                 doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
 225         nla_for_each_nested(nla_a,
 226                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 227                             nla_a_rem)
 228                 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
 229                         struct nlattr *lvl_loc;
 230                         struct nlattr *lvl_rem;
 231
 232                         lvl_loc = nla_find_nested(nla_a,
 233                                                   NLBL_CIPSOV4_A_MLSLVLLOC);
 234                         lvl_rem = nla_find_nested(nla_a,
 235                                                   NLBL_CIPSOV4_A_MLSLVLREM);
 236                         if (lvl_loc == NULL || lvl_rem == NULL)
 237                                 goto add_std_failure;
 238                         doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
 239                                 nla_get_u32(lvl_rem);
 240                         doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
 241                                 nla_get_u32(lvl_loc);
 242                 }
 243
 244         if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
 245                 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 246                                         NLBL_CIPSOV4_A_MAX,
 247                                         netlbl_cipsov4_genl_policy) != 0)
 248                         goto add_std_failure;
 249
 250                 nla_for_each_nested(nla_a,
 251                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 252                                     nla_a_rem)
 253                         if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 254                                 if (nla_validate_nested(nla_a,
 255                                               NLBL_CIPSOV4_A_MAX,
 256                                               netlbl_cipsov4_genl_policy) != 0)
 257                                         goto add_std_failure;
 258                                 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 259                                         switch (nla_type(nla_b)) {
 260                                         case NLBL_CIPSOV4_A_MLSCATLOC:
 261                                                 if (nla_get_u32(nla_b) >
 262                                                     CIPSO_V4_MAX_LOC_CATS)
 263                                                         goto add_std_failure;
 264                                                 if (nla_get_u32(nla_b) >=
 265                                               doi_def->map.std->cat.local_size)
 266                                              doi_def->map.std->cat.local_size =
 267                                                      nla_get_u32(nla_b) + 1;
 268                                                 break;
 269                                         case NLBL_CIPSOV4_A_MLSCATREM:
 270                                                 if (nla_get_u32(nla_b) >
 271                                                     CIPSO_V4_MAX_REM_CATS)
 272                                                         goto add_std_failure;
 273                                                 if (nla_get_u32(nla_b) >=
 274                                               doi_def->map.std->cat.cipso_size)
 275                                              doi_def->map.std->cat.cipso_size =
 276                                                      nla_get_u32(nla_b) + 1;
 277                                                 break;
 278                                         }
 279                         }
 280                 doi_def->map.std->cat.local = kcalloc(
 281                                               doi_def->map.std->cat.local_size,
 282                                               sizeof(u32),
 283                                               GFP_KERNEL);
 284                 if (doi_def->map.std->cat.local == NULL) {
 285                         ret_val = -ENOMEM;
 286                         goto add_std_failure;
 287                 }
 288                 doi_def->map.std->cat.cipso = kcalloc(
 289                                               doi_def->map.std->cat.cipso_size,
 290                                               sizeof(u32),
 291                                               GFP_KERNEL);
 292                 if (doi_def->map.std->cat.cipso == NULL) {
 293                         ret_val = -ENOMEM;
 294                         goto add_std_failure;
 295                 }
 296                 for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
 297                         doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
 298                 for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
 299                         doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
 300                 nla_for_each_nested(nla_a,
 301                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 302                                     nla_a_rem)
 303                         if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 304                                 struct nlattr *cat_loc;
 305                                 struct nlattr *cat_rem;
 306
 307                                 cat_loc = nla_find_nested(nla_a,
 308                                                      NLBL_CIPSOV4_A_MLSCATLOC);
 309                                 cat_rem = nla_find_nested(nla_a,
 310                                                      NLBL_CIPSOV4_A_MLSCATREM);
 311                                 if (cat_loc == NULL || cat_rem == NULL)
 312                                         goto add_std_failure;
 313                                 doi_def->map.std->cat.local[
 314                                                         nla_get_u32(cat_loc)] =
 315                                         nla_get_u32(cat_rem);
 316                                 doi_def->map.std->cat.cipso[
 317                                                         nla_get_u32(cat_rem)] =
 318                                         nla_get_u32(cat_loc);
 319                         }
 320         }
 321
 322         ret_val = cipso_v4_doi_add(doi_def, audit_info);
 323         if (ret_val != 0)
 324                 goto add_std_failure;
 325         return 0;
 326
 327 add_std_failure:
 328         if (doi_def)
 329                 cipso_v4_doi_free(doi_def);
 330         return ret_val;
 331 }
 332
 333 /**
 334  * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
 335  * @info: the Generic NETLINK info block
 336  * @audit_info: NetLabel audit information
 337  *
 338  * Description:
 339  * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
 340  * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
 341  * error.
 342  *
 343  */
 344 static int netlbl_cipsov4_add_pass(struct genl_info *info,
 345                                    struct netlbl_audit *audit_info)
 346 {
 347         int ret_val;
 348         struct cipso_v4_doi *doi_def = NULL;
 349
 350         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 351                 return -EINVAL;
 352
 353         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 354         if (doi_def == NULL)
 355                 return -ENOMEM;
 356         doi_def->type = CIPSO_V4_MAP_PASS;
 357
 358         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 359         if (ret_val != 0)
 360                 goto add_pass_failure;
 361
 362         ret_val = cipso_v4_doi_add(doi_def, audit_info);
 363         if (ret_val != 0)
 364                 goto add_pass_failure;
 365         return 0;
 366
 367 add_pass_failure:
 368         cipso_v4_doi_free(doi_def);
 369         return ret_val;
 370 }
 371
 372 /**
 373  * netlbl_cipsov4_add_local - Adds a CIPSO V4 DOI definition
 374  * @info: the Generic NETLINK info block
 375  * @audit_info: NetLabel audit information
 376  *
 377  * Description:
 378  * Create a new CIPSO_V4_MAP_LOCAL DOI definition based on the given ADD
 379  * message and add it to the CIPSO V4 engine.  Return zero on success and
 380  * non-zero on error.
 381  *
 382  */
 383 static int netlbl_cipsov4_add_local(struct genl_info *info,
 384                                     struct netlbl_audit *audit_info)
 385 {
 386         int ret_val;
 387         struct cipso_v4_doi *doi_def = NULL;
 388
 389         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 390                 return -EINVAL;
 391
 392         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 393         if (doi_def == NULL)
 394                 return -ENOMEM;
 395         doi_def->type = CIPSO_V4_MAP_LOCAL;
 396
 397         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 398         if (ret_val != 0)
 399                 goto add_local_failure;
 400
 401         ret_val = cipso_v4_doi_add(doi_def, audit_info);
 402         if (ret_val != 0)
 403                 goto add_local_failure;
 404         return 0;
 405
 406 add_local_failure:
 407         cipso_v4_doi_free(doi_def);
 408         return ret_val;
 409 }
 410
 411 /**
 412  * netlbl_cipsov4_add - Handle an ADD message
 413  * @skb: the NETLINK buffer
 414  * @info: the Generic NETLINK info block
 415  *
 416  * Description:
 417  * Create a new DOI definition based on the given ADD message and add it to the
 418  * CIPSO V4 engine.  Returns zero on success, negative values on failure.
 419  *
 420  */
 421 static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 422
 423 {
 424         int ret_val = -EINVAL;
 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                 ret_val = netlbl_cipsov4_add_std(info, &audit_info);
 435                 break;
 436         case CIPSO_V4_MAP_PASS:
 437                 ret_val = netlbl_cipsov4_add_pass(info, &audit_info);
 438                 break;
 439         case CIPSO_V4_MAP_LOCAL:
 440                 ret_val = netlbl_cipsov4_add_local(info, &audit_info);
 441                 break;
 442         }
 443         if (ret_val == 0)
 444                 atomic_inc(&netlabel_mgmt_protocount);
 445
 446         return ret_val;
 447 }
 448
 449 /**
 450  * netlbl_cipsov4_list - Handle a LIST message
 451  * @skb: the NETLINK buffer
 452  * @info: the Generic NETLINK info block
 453  *
 454  * Description:
 455  * Process a user generated LIST message and respond accordingly.  While the
 456  * response message generated by the kernel is straightforward, determining
 457  * before hand the size of the buffer to allocate is not (we have to generate
 458  * the message to know the size).  In order to keep this function sane what we
 459  * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
 460  * that size, if we fail then we restart with a larger buffer and try again.
 461  * We continue in this manner until we hit a limit of failed attempts then we
 462  * give up and just send an error message.  Returns zero on success and
 463  * negative values on error.
 464  *
 465  */
 466 static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
 467 {
 468         int ret_val;
 469         struct sk_buff *ans_skb = NULL;
 470         u32 nlsze_mult = 1;
 471         void *data;
 472         u32 doi;
 473         struct nlattr *nla_a;
 474         struct nlattr *nla_b;
 475         struct cipso_v4_doi *doi_def;
 476         u32 iter;
 477
 478         if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
 479                 ret_val = -EINVAL;
 480                 goto list_failure;
 481         }
 482
 483 list_start:
 484         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
 485         if (ans_skb == NULL) {
 486                 ret_val = -ENOMEM;
 487                 goto list_failure;
 488         }
 489         data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
 490                                  0, NLBL_CIPSOV4_C_LIST);
 491         if (data == NULL) {
 492                 ret_val = -ENOMEM;
 493                 goto list_failure;
 494         }
 495
 496         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 497
 498         rcu_read_lock();
 499         doi_def = cipso_v4_doi_getdef(doi);
 500         if (doi_def == NULL) {
 501                 ret_val = -EINVAL;
 502                 goto list_failure_lock;
 503         }
 504
 505         ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
 506         if (ret_val != 0)
 507                 goto list_failure_lock;
 508
 509         nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
 510         if (nla_a == NULL) {
 511                 ret_val = -ENOMEM;
 512                 goto list_failure_lock;
 513         }
 514         for (iter = 0;
 515              iter < CIPSO_V4_TAG_MAXCNT &&
 516                doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
 517              iter++) {
 518                 ret_val = nla_put_u8(ans_skb,
 519                                      NLBL_CIPSOV4_A_TAG,
 520                                      doi_def->tags[iter]);
 521                 if (ret_val != 0)
 522                         goto list_failure_lock;
 523         }
 524         nla_nest_end(ans_skb, nla_a);
 525
 526         switch (doi_def->type) {
 527         case CIPSO_V4_MAP_TRANS:
 528                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
 529                 if (nla_a == NULL) {
 530                         ret_val = -ENOMEM;
 531                         goto list_failure_lock;
 532                 }
 533                 for (iter = 0;
 534                      iter < doi_def->map.std->lvl.local_size;
 535                      iter++) {
 536                         if (doi_def->map.std->lvl.local[iter] ==
 537                             CIPSO_V4_INV_LVL)
 538                                 continue;
 539
 540                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
 541                         if (nla_b == NULL) {
 542                                 ret_val = -ENOMEM;
 543                                 goto list_retry;
 544                         }
 545                         ret_val = nla_put_u32(ans_skb,
 546                                               NLBL_CIPSOV4_A_MLSLVLLOC,
 547                                               iter);
 548                         if (ret_val != 0)
 549                                 goto list_retry;
 550                         ret_val = nla_put_u32(ans_skb,
 551                                             NLBL_CIPSOV4_A_MLSLVLREM,
 552                                             doi_def->map.std->lvl.local[iter]);
 553                         if (ret_val != 0)
 554                                 goto list_retry;
 555                         nla_nest_end(ans_skb, nla_b);
 556                 }
 557                 nla_nest_end(ans_skb, nla_a);
 558
 559                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
 560                 if (nla_a == NULL) {
 561                         ret_val = -ENOMEM;
 562                         goto list_retry;
 563                 }
 564                 for (iter = 0;
 565                      iter < doi_def->map.std->cat.local_size;
 566                      iter++) {
 567                         if (doi_def->map.std->cat.local[iter] ==
 568                             CIPSO_V4_INV_CAT)
 569                                 continue;
 570
 571                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
 572                         if (nla_b == NULL) {
 573                                 ret_val = -ENOMEM;
 574                                 goto list_retry;
 575                         }
 576                         ret_val = nla_put_u32(ans_skb,
 577                                               NLBL_CIPSOV4_A_MLSCATLOC,
 578                                               iter);
 579                         if (ret_val != 0)
 580                                 goto list_retry;
 581                         ret_val = nla_put_u32(ans_skb,
 582                                             NLBL_CIPSOV4_A_MLSCATREM,
 583                                             doi_def->map.std->cat.local[iter]);
 584                         if (ret_val != 0)
 585                                 goto list_retry;
 586                         nla_nest_end(ans_skb, nla_b);
 587                 }
 588                 nla_nest_end(ans_skb, nla_a);
 589
 590                 break;
 591         }
 592         rcu_read_unlock();
 593
 594         genlmsg_end(ans_skb, data);
 595         return genlmsg_reply(ans_skb, info);
 596
 597 list_retry:
 598         /* XXX - this limit is a guesstimate */
 599         if (nlsze_mult < 4) {
 600                 rcu_read_unlock();
 601                 kfree_skb(ans_skb);
 602                 nlsze_mult *= 2;
 603                 goto list_start;
 604         }
 605 list_failure_lock:
 606         rcu_read_unlock();
 607 list_failure:
 608         kfree_skb(ans_skb);
 609         return ret_val;
 610 }
 611
 612 /**
 613  * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
 614  * @doi_def: the CIPSOv4 DOI definition
 615  * @arg: the netlbl_cipsov4_doiwalk_arg structure
 616  *
 617  * Description:
 618  * This function is designed to be used as a callback to the
 619  * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
 620  * message.  Returns the size of the message on success, negative values on
 621  * failure.
 622  *
 623  */
 624 static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
 625 {
 626         int ret_val = -ENOMEM;
 627         struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
 628         void *data;
 629
 630         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
 631                            cb_arg->seq, &netlbl_cipsov4_gnl_family,
 632                            NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
 633         if (data == NULL)
 634                 goto listall_cb_failure;
 635
 636         ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
 637         if (ret_val != 0)
 638                 goto listall_cb_failure;
 639         ret_val = nla_put_u32(cb_arg->skb,
 640                               NLBL_CIPSOV4_A_MTYPE,
 641                               doi_def->type);
 642         if (ret_val != 0)
 643                 goto listall_cb_failure;
 644
 645         return genlmsg_end(cb_arg->skb, data);
 646
 647 listall_cb_failure:
 648         genlmsg_cancel(cb_arg->skb, data);
 649         return ret_val;
 650 }
 651
 652 /**
 653  * netlbl_cipsov4_listall - Handle a LISTALL message
 654  * @skb: the NETLINK buffer
 655  * @cb: the NETLINK callback
 656  *
 657  * Description:
 658  * Process a user generated LISTALL message and respond accordingly.  Returns
 659  * zero on success and negative values on error.
 660  *
 661  */
 662 static int netlbl_cipsov4_listall(struct sk_buff *skb,
 663                                   struct netlink_callback *cb)
 664 {
 665         struct netlbl_cipsov4_doiwalk_arg cb_arg;
 666         u32 doi_skip = cb->args[0];
 667
 668         cb_arg.nl_cb = cb;
 669         cb_arg.skb = skb;
 670         cb_arg.seq = cb->nlh->nlmsg_seq;
 671
 672         cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
 673
 674         cb->args[0] = doi_skip;
 675         return skb->len;
 676 }
 677
 678 /**
 679  * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
 680  * @entry: LSM domain mapping entry
 681  * @arg: the netlbl_domhsh_walk_arg structure
 682  *
 683  * Description:
 684  * This function is intended for use by netlbl_cipsov4_remove() as the callback
 685  * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
 686  * which are associated with the CIPSO DOI specified in @arg.  Returns zero on
 687  * success, negative values on failure.
 688  *
 689  */
 690 static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
 691 {
 692         struct netlbl_domhsh_walk_arg *cb_arg = arg;
 693
 694         if (entry->type == NETLBL_NLTYPE_CIPSOV4 &&
 695             entry->type_def.cipsov4->doi == cb_arg->doi)
 696                 return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
 697
 698         return 0;
 699 }
 700
 701 /**
 702  * netlbl_cipsov4_remove - Handle a REMOVE message
 703  * @skb: the NETLINK buffer
 704  * @info: the Generic NETLINK info block
 705  *
 706  * Description:
 707  * Process a user generated REMOVE message and respond accordingly.  Returns
 708  * zero on success, negative values on failure.
 709  *
 710  */
 711 static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 712 {
 713         int ret_val = -EINVAL;
 714         struct netlbl_domhsh_walk_arg cb_arg;
 715         struct netlbl_audit audit_info;
 716         u32 skip_bkt = 0;
 717         u32 skip_chain = 0;
 718
 719         if (!info->attrs[NLBL_CIPSOV4_A_DOI])
 720                 return -EINVAL;
 721
 722         netlbl_netlink_auditinfo(skb, &audit_info);
 723         cb_arg.doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 724         cb_arg.audit_info = &audit_info;
 725         ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
 726                                      netlbl_cipsov4_remove_cb, &cb_arg);
 727         if (ret_val == 0 || ret_val == -ENOENT) {
 728                 ret_val = cipso_v4_doi_remove(cb_arg.doi, &audit_info);
 729                 if (ret_val == 0)
 730                         atomic_dec(&netlabel_mgmt_protocount);
 731         }
 732
 733         return ret_val;
 734 }
 735
 736 /*
 737  * NetLabel Generic NETLINK Command Definitions
 738  */
 739
 740 static struct genl_ops netlbl_cipsov4_ops[] = {
 741         {
 742         .cmd = NLBL_CIPSOV4_C_ADD,
 743         .flags = GENL_ADMIN_PERM,
 744         .policy = netlbl_cipsov4_genl_policy,
 745         .doit = netlbl_cipsov4_add,
 746         .dumpit = NULL,
 747         },
 748         {
 749         .cmd = NLBL_CIPSOV4_C_REMOVE,
 750         .flags = GENL_ADMIN_PERM,
 751         .policy = netlbl_cipsov4_genl_policy,
 752         .doit = netlbl_cipsov4_remove,
 753         .dumpit = NULL,
 754         },
 755         {
 756         .cmd = NLBL_CIPSOV4_C_LIST,
 757         .flags = 0,
 758         .policy = netlbl_cipsov4_genl_policy,
 759         .doit = netlbl_cipsov4_list,
 760         .dumpit = NULL,
 761         },
 762         {
 763         .cmd = NLBL_CIPSOV4_C_LISTALL,
 764         .flags = 0,
 765         .policy = netlbl_cipsov4_genl_policy,
 766         .doit = NULL,
 767         .dumpit = netlbl_cipsov4_listall,
 768         },
 769 };
 770
 771 /*
 772  * NetLabel Generic NETLINK Protocol Functions
 773  */
 774
 775 /**
 776  * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
 777  *
 778  * Description:
 779  * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
 780  * mechanism.  Returns zero on success, negative values on failure.
 781  *
 782  */
 783 int __init netlbl_cipsov4_genl_init(void)
 784 {
 785         return genl_register_family_with_ops(&netlbl_cipsov4_gnl_family,
 786                 netlbl_cipsov4_ops, ARRAY_SIZE(netlbl_cipsov4_ops));
 787 }