net/netlabel/netlabel_cipso_v4.c

   1 /*
   2  * NetLabel CIPSO/IPv4 Support
   3  *
   4  * This file defines the CIPSO/IPv4 functions for the NetLabel system.  The
   5  * NetLabel system manages static and dynamic label mappings for network
   6  * protocols such as CIPSO and RIPSO.
   7  *
   8  * Author: Paul Moore <paul.moore@hp.com>
   9  *
  10  */
  11
  12 /*
  13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
  14  *
  15  * This program is free software;  you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  23  * the GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program;  if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  *
  29  */
  30
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/string.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/audit.h>
  36 #include <net/sock.h>
  37 #include <net/netlink.h>
  38 #include <net/genetlink.h>
  39 #include <net/netlabel.h>
  40 #include <net/cipso_ipv4.h>
  41
  42 #include "netlabel_user.h"
  43 #include "netlabel_cipso_v4.h"
  44
  45 /* Argument struct for cipso_v4_doi_walk() */
  46 struct netlbl_cipsov4_doiwalk_arg {
  47         struct netlink_callback *nl_cb;
  48         struct sk_buff *skb;
  49         u32 seq;
  50 };
  51
  52 /* NetLabel Generic NETLINK CIPSOv4 family */
  53 static struct genl_family netlbl_cipsov4_gnl_family = {
  54         .id = GENL_ID_GENERATE,
  55         .hdrsize = 0,
  56         .name = NETLBL_NLTYPE_CIPSOV4_NAME,
  57         .version = NETLBL_PROTO_VERSION,
  58         .maxattr = NLBL_CIPSOV4_A_MAX,
  59 };
  60
  61 /* NetLabel Netlink attribute policy */
  62 static struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
  63         [NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
  64         [NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
  65         [NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
  66         [NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
  67         [NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
  68         [NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
  69         [NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
  70         [NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
  71         [NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
  72         [NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
  73         [NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
  74         [NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
  75 };
  76
  77 /*
  78  * Helper Functions
  79  */
  80
  81 /**
  82  * netlbl_cipsov4_doi_free - Frees a CIPSO V4 DOI definition
  83  * @entry: the entry's RCU field
  84  *
  85  * Description:
  86  * This function is designed to be used as a callback to the call_rcu()
  87  * function so that the memory allocated to the DOI definition can be released
  88  * safely.
  89  *
  90  */
  91 static void netlbl_cipsov4_doi_free(struct rcu_head *entry)
  92 {
  93         struct cipso_v4_doi *ptr;
  94
  95         ptr = container_of(entry, struct cipso_v4_doi, rcu);
  96         switch (ptr->type) {
  97         case CIPSO_V4_MAP_STD:
  98                 kfree(ptr->map.std->lvl.cipso);
  99                 kfree(ptr->map.std->lvl.local);
 100                 kfree(ptr->map.std->cat.cipso);
 101                 kfree(ptr->map.std->cat.local);
 102                 break;
 103         }
 104         kfree(ptr);
 105 }
 106
 107 /**
 108  * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
 109  * @info: the Generic NETLINK info block
 110  * @doi_def: the CIPSO V4 DOI definition
 111  *
 112  * Description:
 113  * Parse the common sections of a ADD message and fill in the related values
 114  * in @doi_def.  Returns zero on success, negative values on failure.
 115  *
 116  */
 117 static int netlbl_cipsov4_add_common(struct genl_info *info,
 118                                      struct cipso_v4_doi *doi_def)
 119 {
 120         struct nlattr *nla;
 121         int nla_rem;
 122         u32 iter = 0;
 123
 124         doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 125
 126         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
 127                                 NLBL_CIPSOV4_A_MAX,
 128                                 netlbl_cipsov4_genl_policy) != 0)
 129                 return -EINVAL;
 130
 131         nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
 132                 if (nla->nla_type == NLBL_CIPSOV4_A_TAG) {
 133                         if (iter > CIPSO_V4_TAG_MAXCNT)
 134                                 return -EINVAL;
 135                         doi_def->tags[iter++] = nla_get_u8(nla);
 136                 }
 137         if (iter < CIPSO_V4_TAG_MAXCNT)
 138                 doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
 139
 140         return 0;
 141 }
 142
 143 /*
 144  * NetLabel Command Handlers
 145  */
 146
 147 /**
 148  * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
 149  * @info: the Generic NETLINK info block
 150  *
 151  * Description:
 152  * Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message
 153  * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
 154  * error.
 155  *
 156  */
 157 static int netlbl_cipsov4_add_std(struct genl_info *info)
 158 {
 159         int ret_val = -EINVAL;
 160         struct cipso_v4_doi *doi_def = NULL;
 161         struct nlattr *nla_a;
 162         struct nlattr *nla_b;
 163         int nla_a_rem;
 164         int nla_b_rem;
 165
 166         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
 167             !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
 168                 return -EINVAL;
 169
 170         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 171                                 NLBL_CIPSOV4_A_MAX,
 172                                 netlbl_cipsov4_genl_policy) != 0)
 173                 return -EINVAL;
 174
 175         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 176         if (doi_def == NULL)
 177                 return -ENOMEM;
 178         doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
 179         if (doi_def->map.std == NULL) {
 180                 ret_val = -ENOMEM;
 181                 goto add_std_failure;
 182         }
 183         doi_def->type = CIPSO_V4_MAP_STD;
 184
 185         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 186         if (ret_val != 0)
 187                 goto add_std_failure;
 188
 189         nla_for_each_nested(nla_a,
 190                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 191                             nla_a_rem)
 192                 if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) {
 193                         nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 194                                 switch (nla_b->nla_type) {
 195                                 case NLBL_CIPSOV4_A_MLSLVLLOC:
 196                                         if (nla_get_u32(nla_b) >=
 197                                             doi_def->map.std->lvl.local_size)
 198                                              doi_def->map.std->lvl.local_size =
 199                                                      nla_get_u32(nla_b) + 1;
 200                                         break;
 201                                 case NLBL_CIPSOV4_A_MLSLVLREM:
 202                                         if (nla_get_u32(nla_b) >=
 203                                             doi_def->map.std->lvl.cipso_size)
 204                                              doi_def->map.std->lvl.cipso_size =
 205                                                      nla_get_u32(nla_b) + 1;
 206                                         break;
 207                                 }
 208                 }
 209         if (doi_def->map.std->lvl.local_size > CIPSO_V4_MAX_LOC_LVLS ||
 210             doi_def->map.std->lvl.cipso_size > CIPSO_V4_MAX_REM_LVLS)
 211                 goto add_std_failure;
 212         doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
 213                                               sizeof(u32),
 214                                               GFP_KERNEL);
 215         if (doi_def->map.std->lvl.local == NULL) {
 216                 ret_val = -ENOMEM;
 217                 goto add_std_failure;
 218         }
 219         doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
 220                                               sizeof(u32),
 221                                               GFP_KERNEL);
 222         if (doi_def->map.std->lvl.cipso == NULL) {
 223                 ret_val = -ENOMEM;
 224                 goto add_std_failure;
 225         }
 226         nla_for_each_nested(nla_a,
 227                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 228                             nla_a_rem)
 229                 if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) {
 230                         struct nlattr *lvl_loc;
 231                         struct nlattr *lvl_rem;
 232
 233                         if (nla_validate_nested(nla_a,
 234                                               NLBL_CIPSOV4_A_MAX,
 235                                               netlbl_cipsov4_genl_policy) != 0)
 236                                 goto add_std_failure;
 237
 238                         lvl_loc = nla_find_nested(nla_a,
 239                                                   NLBL_CIPSOV4_A_MLSLVLLOC);
 240                         lvl_rem = nla_find_nested(nla_a,
 241                                                   NLBL_CIPSOV4_A_MLSLVLREM);
 242                         if (lvl_loc == NULL || lvl_rem == NULL)
 243                                 goto add_std_failure;
 244                         doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
 245                                 nla_get_u32(lvl_rem);
 246                         doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
 247                                 nla_get_u32(lvl_loc);
 248                 }
 249
 250         if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
 251                 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 252                                         NLBL_CIPSOV4_A_MAX,
 253                                         netlbl_cipsov4_genl_policy) != 0)
 254                         goto add_std_failure;
 255
 256                 nla_for_each_nested(nla_a,
 257                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 258                                     nla_a_rem)
 259                         if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSCAT) {
 260                                 if (nla_validate_nested(nla_a,
 261                                               NLBL_CIPSOV4_A_MAX,
 262                                               netlbl_cipsov4_genl_policy) != 0)
 263                                         goto add_std_failure;
 264                                 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 265                                         switch (nla_b->nla_type) {
 266                                         case NLBL_CIPSOV4_A_MLSCATLOC:
 267                                                 if (nla_get_u32(nla_b) >=
 268                                               doi_def->map.std->cat.local_size)
 269                                              doi_def->map.std->cat.local_size =
 270                                                      nla_get_u32(nla_b) + 1;
 271                                                 break;
 272                                         case NLBL_CIPSOV4_A_MLSCATREM:
 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                 if (doi_def->map.std->cat.local_size > CIPSO_V4_MAX_LOC_CATS ||
 281                     doi_def->map.std->cat.cipso_size > CIPSO_V4_MAX_REM_CATS)
 282                         goto add_std_failure;
 283                 doi_def->map.std->cat.local = kcalloc(
 284                                               doi_def->map.std->cat.local_size,
 285                                               sizeof(u32),
 286                                               GFP_KERNEL);
 287                 if (doi_def->map.std->cat.local == NULL) {
 288                         ret_val = -ENOMEM;
 289                         goto add_std_failure;
 290                 }
 291                 doi_def->map.std->cat.cipso = kcalloc(
 292                                               doi_def->map.std->cat.cipso_size,
 293                                               sizeof(u32),
 294                                               GFP_KERNEL);
 295                 if (doi_def->map.std->cat.cipso == NULL) {
 296                         ret_val = -ENOMEM;
 297                         goto add_std_failure;
 298                 }
 299                 nla_for_each_nested(nla_a,
 300                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 301                                     nla_a_rem)
 302                         if (nla_a->nla_type == 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);
 322         if (ret_val != 0)
 323                 goto add_std_failure;
 324         return 0;
 325
 326 add_std_failure:
 327         if (doi_def)
 328                 netlbl_cipsov4_doi_free(&doi_def->rcu);
 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  *
 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 {
 344         int ret_val;
 345         struct cipso_v4_doi *doi_def = NULL;
 346
 347         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 348                 return -EINVAL;
 349
 350         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 351         if (doi_def == NULL)
 352                 return -ENOMEM;
 353         doi_def->type = CIPSO_V4_MAP_PASS;
 354
 355         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 356         if (ret_val != 0)
 357                 goto add_pass_failure;
 358
 359         ret_val = cipso_v4_doi_add(doi_def);
 360         if (ret_val != 0)
 361                 goto add_pass_failure;
 362         return 0;
 363
 364 add_pass_failure:
 365         netlbl_cipsov4_doi_free(&doi_def->rcu);
 366         return ret_val;
 367 }
 368
 369 /**
 370  * netlbl_cipsov4_add - Handle an ADD message
 371  * @skb: the NETLINK buffer
 372  * @info: the Generic NETLINK info block
 373  *
 374  * Description:
 375  * Create a new DOI definition based on the given ADD message and add it to the
 376  * CIPSO V4 engine.  Returns zero on success, negative values on failure.
 377  *
 378  */
 379 static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 380
 381 {
 382         int ret_val = -EINVAL;
 383         u32 type;
 384         u32 doi;
 385         const char *type_str = "(unknown)";
 386         struct audit_buffer *audit_buf;
 387         struct netlbl_audit audit_info;
 388
 389         if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
 390             !info->attrs[NLBL_CIPSOV4_A_MTYPE])
 391                 return -EINVAL;
 392
 393         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 394         netlbl_netlink_auditinfo(skb, &audit_info);
 395
 396         type = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE]);
 397         switch (type) {
 398         case CIPSO_V4_MAP_STD:
 399                 type_str = "std";
 400                 ret_val = netlbl_cipsov4_add_std(info);
 401                 break;
 402         case CIPSO_V4_MAP_PASS:
 403                 type_str = "pass";
 404                 ret_val = netlbl_cipsov4_add_pass(info);
 405                 break;
 406         }
 407
 408         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
 409                                               &audit_info);
 410         audit_log_format(audit_buf,
 411                          " cipso_doi=%u cipso_type=%s res=%u",
 412                          doi,
 413                          type_str,
 414                          ret_val == 0 ? 1 : 0);
 415         audit_log_end(audit_buf);
 416
 417         return ret_val;
 418 }
 419
 420 /**
 421  * netlbl_cipsov4_list - Handle a LIST message
 422  * @skb: the NETLINK buffer
 423  * @info: the Generic NETLINK info block
 424  *
 425  * Description:
 426  * Process a user generated LIST message and respond accordingly.  While the
 427  * response message generated by the kernel is straightforward, determining
 428  * before hand the size of the buffer to allocate is not (we have to generate
 429  * the message to know the size).  In order to keep this function sane what we
 430  * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
 431  * that size, if we fail then we restart with a larger buffer and try again.
 432  * We continue in this manner until we hit a limit of failed attempts then we
 433  * give up and just send an error message.  Returns zero on success and
 434  * negative values on error.
 435  *
 436  */
 437 static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
 438 {
 439         int ret_val;
 440         struct sk_buff *ans_skb = NULL;
 441         u32 nlsze_mult = 1;
 442         void *data;
 443         u32 doi;
 444         struct nlattr *nla_a;
 445         struct nlattr *nla_b;
 446         struct cipso_v4_doi *doi_def;
 447         u32 iter;
 448
 449         if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
 450                 ret_val = -EINVAL;
 451                 goto list_failure;
 452         }
 453
 454 list_start:
 455         ans_skb = nlmsg_new(NLMSG_GOODSIZE * nlsze_mult, GFP_KERNEL);
 456         if (ans_skb == NULL) {
 457                 ret_val = -ENOMEM;
 458                 goto list_failure;
 459         }
 460         data = netlbl_netlink_hdr_put(ans_skb,
 461                                       info->snd_pid,
 462                                       info->snd_seq,
 463                                       netlbl_cipsov4_gnl_family.id,
 464                                       0,
 465                                       NLBL_CIPSOV4_C_LIST);
 466         if (data == NULL) {
 467                 ret_val = -ENOMEM;
 468                 goto list_failure;
 469         }
 470
 471         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 472
 473         rcu_read_lock();
 474         doi_def = cipso_v4_doi_getdef(doi);
 475         if (doi_def == NULL) {
 476                 ret_val = -EINVAL;
 477                 goto list_failure;
 478         }
 479
 480         ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
 481         if (ret_val != 0)
 482                 goto list_failure_lock;
 483
 484         nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
 485         if (nla_a == NULL) {
 486                 ret_val = -ENOMEM;
 487                 goto list_failure_lock;
 488         }
 489         for (iter = 0;
 490              iter < CIPSO_V4_TAG_MAXCNT &&
 491                doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
 492              iter++) {
 493                 ret_val = nla_put_u8(ans_skb,
 494                                      NLBL_CIPSOV4_A_TAG,
 495                                      doi_def->tags[iter]);
 496                 if (ret_val != 0)
 497                         goto list_failure_lock;
 498         }
 499         nla_nest_end(ans_skb, nla_a);
 500
 501         switch (doi_def->type) {
 502         case CIPSO_V4_MAP_STD:
 503                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
 504                 if (nla_a == NULL) {
 505                         ret_val = -ENOMEM;
 506                         goto list_failure_lock;
 507                 }
 508                 for (iter = 0;
 509                      iter < doi_def->map.std->lvl.local_size;
 510                      iter++) {
 511                         if (doi_def->map.std->lvl.local[iter] ==
 512                             CIPSO_V4_INV_LVL)
 513                                 continue;
 514
 515                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
 516                         if (nla_b == NULL) {
 517                                 ret_val = -ENOMEM;
 518                                 goto list_retry;
 519                         }
 520                         ret_val = nla_put_u32(ans_skb,
 521                                               NLBL_CIPSOV4_A_MLSLVLLOC,
 522                                               iter);
 523                         if (ret_val != 0)
 524                                 goto list_retry;
 525                         ret_val = nla_put_u32(ans_skb,
 526                                             NLBL_CIPSOV4_A_MLSLVLREM,
 527                                             doi_def->map.std->lvl.local[iter]);
 528                         if (ret_val != 0)
 529                                 goto list_retry;
 530                         nla_nest_end(ans_skb, nla_b);
 531                 }
 532                 nla_nest_end(ans_skb, nla_a);
 533
 534                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
 535                 if (nla_a == NULL) {
 536                         ret_val = -ENOMEM;
 537                         goto list_retry;
 538                 }
 539                 for (iter = 0;
 540                      iter < doi_def->map.std->cat.local_size;
 541                      iter++) {
 542                         if (doi_def->map.std->cat.local[iter] ==
 543                             CIPSO_V4_INV_CAT)
 544                                 continue;
 545
 546                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
 547                         if (nla_b == NULL) {
 548                                 ret_val = -ENOMEM;
 549                                 goto list_retry;
 550                         }
 551                         ret_val = nla_put_u32(ans_skb,
 552                                               NLBL_CIPSOV4_A_MLSCATLOC,
 553                                               iter);
 554                         if (ret_val != 0)
 555                                 goto list_retry;
 556                         ret_val = nla_put_u32(ans_skb,
 557                                             NLBL_CIPSOV4_A_MLSCATREM,
 558                                             doi_def->map.std->cat.local[iter]);
 559                         if (ret_val != 0)
 560                                 goto list_retry;
 561                         nla_nest_end(ans_skb, nla_b);
 562                 }
 563                 nla_nest_end(ans_skb, nla_a);
 564
 565                 break;
 566         }
 567         rcu_read_unlock();
 568
 569         genlmsg_end(ans_skb, data);
 570
 571         ret_val = genlmsg_unicast(ans_skb, info->snd_pid);
 572         if (ret_val != 0)
 573                 goto list_failure;
 574
 575         return 0;
 576
 577 list_retry:
 578         /* XXX - this limit is a guesstimate */
 579         if (nlsze_mult < 4) {
 580                 rcu_read_unlock();
 581                 kfree_skb(ans_skb);
 582                 nlsze_mult++;
 583                 goto list_start;
 584         }
 585 list_failure_lock:
 586         rcu_read_unlock();
 587 list_failure:
 588         kfree_skb(ans_skb);
 589         return ret_val;
 590 }
 591
 592 /**
 593  * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
 594  * @doi_def: the CIPSOv4 DOI definition
 595  * @arg: the netlbl_cipsov4_doiwalk_arg structure
 596  *
 597  * Description:
 598  * This function is designed to be used as a callback to the
 599  * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
 600  * message.  Returns the size of the message on success, negative values on
 601  * failure.
 602  *
 603  */
 604 static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
 605 {
 606         int ret_val = -ENOMEM;
 607         struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
 608         void *data;
 609
 610         data = netlbl_netlink_hdr_put(cb_arg->skb,
 611                                       NETLINK_CB(cb_arg->nl_cb->skb).pid,
 612                                       cb_arg->seq,
 613                                       netlbl_cipsov4_gnl_family.id,
 614                                       NLM_F_MULTI,
 615                                       NLBL_CIPSOV4_C_LISTALL);
 616         if (data == NULL)
 617                 goto listall_cb_failure;
 618
 619         ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
 620         if (ret_val != 0)
 621                 goto listall_cb_failure;
 622         ret_val = nla_put_u32(cb_arg->skb,
 623                               NLBL_CIPSOV4_A_MTYPE,
 624                               doi_def->type);
 625         if (ret_val != 0)
 626                 goto listall_cb_failure;
 627
 628         return genlmsg_end(cb_arg->skb, data);
 629
 630 listall_cb_failure:
 631         genlmsg_cancel(cb_arg->skb, data);
 632         return ret_val;
 633 }
 634
 635 /**
 636  * netlbl_cipsov4_listall - Handle a LISTALL message
 637  * @skb: the NETLINK buffer
 638  * @cb: the NETLINK callback
 639  *
 640  * Description:
 641  * Process a user generated LISTALL message and respond accordingly.  Returns
 642  * zero on success and negative values on error.
 643  *
 644  */
 645 static int netlbl_cipsov4_listall(struct sk_buff *skb,
 646                                   struct netlink_callback *cb)
 647 {
 648         struct netlbl_cipsov4_doiwalk_arg cb_arg;
 649         int doi_skip = cb->args[0];
 650
 651         cb_arg.nl_cb = cb;
 652         cb_arg.skb = skb;
 653         cb_arg.seq = cb->nlh->nlmsg_seq;
 654
 655         cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
 656
 657         cb->args[0] = doi_skip;
 658         return skb->len;
 659 }
 660
 661 /**
 662  * netlbl_cipsov4_remove - Handle a REMOVE message
 663  * @skb: the NETLINK buffer
 664  * @info: the Generic NETLINK info block
 665  *
 666  * Description:
 667  * Process a user generated REMOVE message and respond accordingly.  Returns
 668  * zero on success, negative values on failure.
 669  *
 670  */
 671 static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 672 {
 673         int ret_val = -EINVAL;
 674         u32 doi = 0;
 675         struct audit_buffer *audit_buf;
 676         struct netlbl_audit audit_info;
 677
 678         if (!info->attrs[NLBL_CIPSOV4_A_DOI])
 679                 return -EINVAL;
 680
 681         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 682         netlbl_netlink_auditinfo(skb, &audit_info);
 683
 684         ret_val = cipso_v4_doi_remove(doi,
 685                                       &audit_info,
 686                                       netlbl_cipsov4_doi_free);
 687
 688         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
 689                                               &audit_info);
 690         audit_log_format(audit_buf,
 691                          " cipso_doi=%u res=%u",
 692                          doi,
 693                          ret_val == 0 ? 1 : 0);
 694         audit_log_end(audit_buf);
 695
 696         return ret_val;
 697 }
 698
 699 /*
 700  * NetLabel Generic NETLINK Command Definitions
 701  */
 702
 703 static struct genl_ops netlbl_cipsov4_genl_c_add = {
 704         .cmd = NLBL_CIPSOV4_C_ADD,
 705         .flags = GENL_ADMIN_PERM,
 706         .policy = netlbl_cipsov4_genl_policy,
 707         .doit = netlbl_cipsov4_add,
 708         .dumpit = NULL,
 709 };
 710
 711 static struct genl_ops netlbl_cipsov4_genl_c_remove = {
 712         .cmd = NLBL_CIPSOV4_C_REMOVE,
 713         .flags = GENL_ADMIN_PERM,
 714         .policy = netlbl_cipsov4_genl_policy,
 715         .doit = netlbl_cipsov4_remove,
 716         .dumpit = NULL,
 717 };
 718
 719 static struct genl_ops netlbl_cipsov4_genl_c_list = {
 720         .cmd = NLBL_CIPSOV4_C_LIST,
 721         .flags = 0,
 722         .policy = netlbl_cipsov4_genl_policy,
 723         .doit = netlbl_cipsov4_list,
 724         .dumpit = NULL,
 725 };
 726
 727 static struct genl_ops netlbl_cipsov4_genl_c_listall = {
 728         .cmd = NLBL_CIPSOV4_C_LISTALL,
 729         .flags = 0,
 730         .policy = netlbl_cipsov4_genl_policy,
 731         .doit = NULL,
 732         .dumpit = netlbl_cipsov4_listall,
 733 };
 734
 735 /*
 736  * NetLabel Generic NETLINK Protocol Functions
 737  */
 738
 739 /**
 740  * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
 741  *
 742  * Description:
 743  * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
 744  * mechanism.  Returns zero on success, negative values on failure.
 745  *
 746  */
 747 int netlbl_cipsov4_genl_init(void)
 748 {
 749         int ret_val;
 750
 751         ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
 752         if (ret_val != 0)
 753                 return ret_val;
 754
 755         ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 756                                     &netlbl_cipsov4_genl_c_add);
 757         if (ret_val != 0)
 758                 return ret_val;
 759         ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 760                                     &netlbl_cipsov4_genl_c_remove);
 761         if (ret_val != 0)
 762                 return ret_val;
 763         ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 764                                     &netlbl_cipsov4_genl_c_list);
 765         if (ret_val != 0)
 766                 return ret_val;
 767         ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 768                                     &netlbl_cipsov4_genl_c_listall);
 769         if (ret_val != 0)
 770                 return ret_val;
 771
 772         return 0;
 773 }