SAFE public projects git trees. - safe/jmp/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  *
 134  * Description:
 135  * Create a new CIPSO_V4_MAP_TRANS DOI definition based on the given ADD
 136  * message and add it to the CIPSO V4 engine.  Return zero on success and
 137  * non-zero on error.
 138  *
 139  */
 140 static int netlbl_cipsov4_add_std(struct genl_info *info)
 141 {
 142         int ret_val = -EINVAL;
 143         struct cipso_v4_doi *doi_def = NULL;
 144         struct nlattr *nla_a;
 145         struct nlattr *nla_b;
 146         int nla_a_rem;
 147         int nla_b_rem;
 148         u32 iter;
 149
 150         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
 151             !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
 152                 return -EINVAL;
 153
 154         if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 155                                 NLBL_CIPSOV4_A_MAX,
 156                                 netlbl_cipsov4_genl_policy) != 0)
 157                 return -EINVAL;
 158
 159         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 160         if (doi_def == NULL)
 161                 return -ENOMEM;
 162         doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
 163         if (doi_def->map.std == NULL) {
 164                 ret_val = -ENOMEM;
 165                 goto add_std_failure;
 166         }
 167         doi_def->type = CIPSO_V4_MAP_TRANS;
 168
 169         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 170         if (ret_val != 0)
 171                 goto add_std_failure;
 172         ret_val = -EINVAL;
 173
 174         nla_for_each_nested(nla_a,
 175                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 176                             nla_a_rem)
 177                 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
 178                         if (nla_validate_nested(nla_a,
 179                                             NLBL_CIPSOV4_A_MAX,
 180                                             netlbl_cipsov4_genl_policy) != 0)
 181                                         goto add_std_failure;
 182                         nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 183                                 switch (nla_type(nla_b)) {
 184                                 case NLBL_CIPSOV4_A_MLSLVLLOC:
 185                                         if (nla_get_u32(nla_b) >
 186                                             CIPSO_V4_MAX_LOC_LVLS)
 187                                                 goto add_std_failure;
 188                                         if (nla_get_u32(nla_b) >=
 189                                             doi_def->map.std->lvl.local_size)
 190                                              doi_def->map.std->lvl.local_size =
 191                                                      nla_get_u32(nla_b) + 1;
 192                                         break;
 193                                 case NLBL_CIPSOV4_A_MLSLVLREM:
 194                                         if (nla_get_u32(nla_b) >
 195                                             CIPSO_V4_MAX_REM_LVLS)
 196                                                 goto add_std_failure;
 197                                         if (nla_get_u32(nla_b) >=
 198                                             doi_def->map.std->lvl.cipso_size)
 199                                              doi_def->map.std->lvl.cipso_size =
 200                                                      nla_get_u32(nla_b) + 1;
 201                                         break;
 202                                 }
 203                 }
 204         doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
 205                                               sizeof(u32),
 206                                               GFP_KERNEL);
 207         if (doi_def->map.std->lvl.local == NULL) {
 208                 ret_val = -ENOMEM;
 209                 goto add_std_failure;
 210         }
 211         doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
 212                                               sizeof(u32),
 213                                               GFP_KERNEL);
 214         if (doi_def->map.std->lvl.cipso == NULL) {
 215                 ret_val = -ENOMEM;
 216                 goto add_std_failure;
 217         }
 218         for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
 219                 doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
 220         for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
 221                 doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
 222         nla_for_each_nested(nla_a,
 223                             info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 224                             nla_a_rem)
 225                 if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
 226                         struct nlattr *lvl_loc;
 227                         struct nlattr *lvl_rem;
 228
 229                         lvl_loc = nla_find_nested(nla_a,
 230                                                   NLBL_CIPSOV4_A_MLSLVLLOC);
 231                         lvl_rem = nla_find_nested(nla_a,
 232                                                   NLBL_CIPSOV4_A_MLSLVLREM);
 233                         if (lvl_loc == NULL || lvl_rem == NULL)
 234                                 goto add_std_failure;
 235                         doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
 236                                 nla_get_u32(lvl_rem);
 237                         doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
 238                                 nla_get_u32(lvl_loc);
 239                 }
 240
 241         if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
 242                 if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 243                                         NLBL_CIPSOV4_A_MAX,
 244                                         netlbl_cipsov4_genl_policy) != 0)
 245                         goto add_std_failure;
 246
 247                 nla_for_each_nested(nla_a,
 248                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 249                                     nla_a_rem)
 250                         if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 251                                 if (nla_validate_nested(nla_a,
 252                                               NLBL_CIPSOV4_A_MAX,
 253                                               netlbl_cipsov4_genl_policy) != 0)
 254                                         goto add_std_failure;
 255                                 nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 256                                         switch (nla_type(nla_b)) {
 257                                         case NLBL_CIPSOV4_A_MLSCATLOC:
 258                                                 if (nla_get_u32(nla_b) >
 259                                                     CIPSO_V4_MAX_LOC_CATS)
 260                                                         goto add_std_failure;
 261                                                 if (nla_get_u32(nla_b) >=
 262                                               doi_def->map.std->cat.local_size)
 263                                              doi_def->map.std->cat.local_size =
 264                                                      nla_get_u32(nla_b) + 1;
 265                                                 break;
 266                                         case NLBL_CIPSOV4_A_MLSCATREM:
 267                                                 if (nla_get_u32(nla_b) >
 268                                                     CIPSO_V4_MAX_REM_CATS)
 269                                                         goto add_std_failure;
 270                                                 if (nla_get_u32(nla_b) >=
 271                                               doi_def->map.std->cat.cipso_size)
 272                                              doi_def->map.std->cat.cipso_size =
 273                                                      nla_get_u32(nla_b) + 1;
 274                                                 break;
 275                                         }
 276                         }
 277                 doi_def->map.std->cat.local = kcalloc(
 278                                               doi_def->map.std->cat.local_size,
 279                                               sizeof(u32),
 280                                               GFP_KERNEL);
 281                 if (doi_def->map.std->cat.local == NULL) {
 282                         ret_val = -ENOMEM;
 283                         goto add_std_failure;
 284                 }
 285                 doi_def->map.std->cat.cipso = kcalloc(
 286                                               doi_def->map.std->cat.cipso_size,
 287                                               sizeof(u32),
 288                                               GFP_KERNEL);
 289                 if (doi_def->map.std->cat.cipso == NULL) {
 290                         ret_val = -ENOMEM;
 291                         goto add_std_failure;
 292                 }
 293                 for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
 294                         doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
 295                 for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
 296                         doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
 297                 nla_for_each_nested(nla_a,
 298                                     info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 299                                     nla_a_rem)
 300                         if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 301                                 struct nlattr *cat_loc;
 302                                 struct nlattr *cat_rem;
 303
 304                                 cat_loc = nla_find_nested(nla_a,
 305                                                      NLBL_CIPSOV4_A_MLSCATLOC);
 306                                 cat_rem = nla_find_nested(nla_a,
 307                                                      NLBL_CIPSOV4_A_MLSCATREM);
 308                                 if (cat_loc == NULL || cat_rem == NULL)
 309                                         goto add_std_failure;
 310                                 doi_def->map.std->cat.local[
 311                                                         nla_get_u32(cat_loc)] =
 312                                         nla_get_u32(cat_rem);
 313                                 doi_def->map.std->cat.cipso[
 314                                                         nla_get_u32(cat_rem)] =
 315                                         nla_get_u32(cat_loc);
 316                         }
 317         }
 318
 319         ret_val = cipso_v4_doi_add(doi_def);
 320         if (ret_val != 0)
 321                 goto add_std_failure;
 322         return 0;
 323
 324 add_std_failure:
 325         if (doi_def)
 326                 cipso_v4_doi_free(doi_def);
 327         return ret_val;
 328 }
 329
 330 /**
 331  * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
 332  * @info: the Generic NETLINK info block
 333  *
 334  * Description:
 335  * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
 336  * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
 337  * error.
 338  *
 339  */
 340 static int netlbl_cipsov4_add_pass(struct genl_info *info)
 341 {
 342         int ret_val;
 343         struct cipso_v4_doi *doi_def = NULL;
 344
 345         if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 346                 return -EINVAL;
 347
 348         doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 349         if (doi_def == NULL)
 350                 return -ENOMEM;
 351         doi_def->type = CIPSO_V4_MAP_PASS;
 352
 353         ret_val = netlbl_cipsov4_add_common(info, doi_def);
 354         if (ret_val != 0)
 355                 goto add_pass_failure;
 356
 357         ret_val = cipso_v4_doi_add(doi_def);
 358         if (ret_val != 0)
 359                 goto add_pass_failure;
 360         return 0;
 361
 362 add_pass_failure:
 363         cipso_v4_doi_free(doi_def);
 364         return ret_val;
 365 }
 366
 367 /**
 368  * netlbl_cipsov4_add - Handle an ADD message
 369  * @skb: the NETLINK buffer
 370  * @info: the Generic NETLINK info block
 371  *
 372  * Description:
 373  * Create a new DOI definition based on the given ADD message and add it to the
 374  * CIPSO V4 engine.  Returns zero on success, negative values on failure.
 375  *
 376  */
 377 static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 378
 379 {
 380         int ret_val = -EINVAL;
 381         u32 type;
 382         u32 doi;
 383         const char *type_str = "(unknown)";
 384         struct audit_buffer *audit_buf;
 385         struct netlbl_audit audit_info;
 386
 387         if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
 388             !info->attrs[NLBL_CIPSOV4_A_MTYPE])
 389                 return -EINVAL;
 390
 391         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 392         netlbl_netlink_auditinfo(skb, &audit_info);
 393
 394         type = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE]);
 395         switch (type) {
 396         case CIPSO_V4_MAP_TRANS:
 397                 type_str = "trans";
 398                 ret_val = netlbl_cipsov4_add_std(info);
 399                 break;
 400         case CIPSO_V4_MAP_PASS:
 401                 type_str = "pass";
 402                 ret_val = netlbl_cipsov4_add_pass(info);
 403                 break;
 404         }
 405         if (ret_val == 0)
 406                 atomic_inc(&netlabel_mgmt_protocount);
 407
 408         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
 409                                               &audit_info);
 410         if (audit_buf != NULL) {
 411                 audit_log_format(audit_buf,
 412                                  " cipso_doi=%u cipso_type=%s res=%u",
 413                                  doi,
 414                                  type_str,
 415                                  ret_val == 0 ? 1 : 0);
 416                 audit_log_end(audit_buf);
 417         }
 418
 419         return ret_val;
 420 }
 421
 422 /**
 423  * netlbl_cipsov4_list - Handle a LIST message
 424  * @skb: the NETLINK buffer
 425  * @info: the Generic NETLINK info block
 426  *
 427  * Description:
 428  * Process a user generated LIST message and respond accordingly.  While the
 429  * response message generated by the kernel is straightforward, determining
 430  * before hand the size of the buffer to allocate is not (we have to generate
 431  * the message to know the size).  In order to keep this function sane what we
 432  * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
 433  * that size, if we fail then we restart with a larger buffer and try again.
 434  * We continue in this manner until we hit a limit of failed attempts then we
 435  * give up and just send an error message.  Returns zero on success and
 436  * negative values on error.
 437  *
 438  */
 439 static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
 440 {
 441         int ret_val;
 442         struct sk_buff *ans_skb = NULL;
 443         u32 nlsze_mult = 1;
 444         void *data;
 445         u32 doi;
 446         struct nlattr *nla_a;
 447         struct nlattr *nla_b;
 448         struct cipso_v4_doi *doi_def;
 449         u32 iter;
 450
 451         if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
 452                 ret_val = -EINVAL;
 453                 goto list_failure;
 454         }
 455
 456 list_start:
 457         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
 458         if (ans_skb == NULL) {
 459                 ret_val = -ENOMEM;
 460                 goto list_failure;
 461         }
 462         data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
 463                                  0, NLBL_CIPSOV4_C_LIST);
 464         if (data == NULL) {
 465                 ret_val = -ENOMEM;
 466                 goto list_failure;
 467         }
 468
 469         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 470
 471         rcu_read_lock();
 472         doi_def = cipso_v4_doi_getdef(doi);
 473         if (doi_def == NULL) {
 474                 ret_val = -EINVAL;
 475                 goto list_failure_lock;
 476         }
 477
 478         ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
 479         if (ret_val != 0)
 480                 goto list_failure_lock;
 481
 482         nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
 483         if (nla_a == NULL) {
 484                 ret_val = -ENOMEM;
 485                 goto list_failure_lock;
 486         }
 487         for (iter = 0;
 488              iter < CIPSO_V4_TAG_MAXCNT &&
 489                doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
 490              iter++) {
 491                 ret_val = nla_put_u8(ans_skb,
 492                                      NLBL_CIPSOV4_A_TAG,
 493                                      doi_def->tags[iter]);
 494                 if (ret_val != 0)
 495                         goto list_failure_lock;
 496         }
 497         nla_nest_end(ans_skb, nla_a);
 498
 499         switch (doi_def->type) {
 500         case CIPSO_V4_MAP_TRANS:
 501                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
 502                 if (nla_a == NULL) {
 503                         ret_val = -ENOMEM;
 504                         goto list_failure_lock;
 505                 }
 506                 for (iter = 0;
 507                      iter < doi_def->map.std->lvl.local_size;
 508                      iter++) {
 509                         if (doi_def->map.std->lvl.local[iter] ==
 510                             CIPSO_V4_INV_LVL)
 511                                 continue;
 512
 513                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
 514                         if (nla_b == NULL) {
 515                                 ret_val = -ENOMEM;
 516                                 goto list_retry;
 517                         }
 518                         ret_val = nla_put_u32(ans_skb,
 519                                               NLBL_CIPSOV4_A_MLSLVLLOC,
 520                                               iter);
 521                         if (ret_val != 0)
 522                                 goto list_retry;
 523                         ret_val = nla_put_u32(ans_skb,
 524                                             NLBL_CIPSOV4_A_MLSLVLREM,
 525                                             doi_def->map.std->lvl.local[iter]);
 526                         if (ret_val != 0)
 527                                 goto list_retry;
 528                         nla_nest_end(ans_skb, nla_b);
 529                 }
 530                 nla_nest_end(ans_skb, nla_a);
 531
 532                 nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
 533                 if (nla_a == NULL) {
 534                         ret_val = -ENOMEM;
 535                         goto list_retry;
 536                 }
 537                 for (iter = 0;
 538                      iter < doi_def->map.std->cat.local_size;
 539                      iter++) {
 540                         if (doi_def->map.std->cat.local[iter] ==
 541                             CIPSO_V4_INV_CAT)
 542                                 continue;
 543
 544                         nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
 545                         if (nla_b == NULL) {
 546                                 ret_val = -ENOMEM;
 547                                 goto list_retry;
 548                         }
 549                         ret_val = nla_put_u32(ans_skb,
 550                                               NLBL_CIPSOV4_A_MLSCATLOC,
 551                                               iter);
 552                         if (ret_val != 0)
 553                                 goto list_retry;
 554                         ret_val = nla_put_u32(ans_skb,
 555                                             NLBL_CIPSOV4_A_MLSCATREM,
 556                                             doi_def->map.std->cat.local[iter]);
 557                         if (ret_val != 0)
 558                                 goto list_retry;
 559                         nla_nest_end(ans_skb, nla_b);
 560                 }
 561                 nla_nest_end(ans_skb, nla_a);
 562
 563                 break;
 564         }
 565         rcu_read_unlock();
 566
 567         genlmsg_end(ans_skb, data);
 568         return genlmsg_reply(ans_skb, info);
 569
 570 list_retry:
 571         /* XXX - this limit is a guesstimate */
 572         if (nlsze_mult < 4) {
 573                 rcu_read_unlock();
 574                 kfree_skb(ans_skb);
 575                 nlsze_mult *= 2;
 576                 goto list_start;
 577         }
 578 list_failure_lock:
 579         rcu_read_unlock();
 580 list_failure:
 581         kfree_skb(ans_skb);
 582         return ret_val;
 583 }
 584
 585 /**
 586  * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
 587  * @doi_def: the CIPSOv4 DOI definition
 588  * @arg: the netlbl_cipsov4_doiwalk_arg structure
 589  *
 590  * Description:
 591  * This function is designed to be used as a callback to the
 592  * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
 593  * message.  Returns the size of the message on success, negative values on
 594  * failure.
 595  *
 596  */
 597 static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
 598 {
 599         int ret_val = -ENOMEM;
 600         struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
 601         void *data;
 602
 603         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
 604                            cb_arg->seq, &netlbl_cipsov4_gnl_family,
 605                            NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
 606         if (data == NULL)
 607                 goto listall_cb_failure;
 608
 609         ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
 610         if (ret_val != 0)
 611                 goto listall_cb_failure;
 612         ret_val = nla_put_u32(cb_arg->skb,
 613                               NLBL_CIPSOV4_A_MTYPE,
 614                               doi_def->type);
 615         if (ret_val != 0)
 616                 goto listall_cb_failure;
 617
 618         return genlmsg_end(cb_arg->skb, data);
 619
 620 listall_cb_failure:
 621         genlmsg_cancel(cb_arg->skb, data);
 622         return ret_val;
 623 }
 624
 625 /**
 626  * netlbl_cipsov4_listall - Handle a LISTALL message
 627  * @skb: the NETLINK buffer
 628  * @cb: the NETLINK callback
 629  *
 630  * Description:
 631  * Process a user generated LISTALL message and respond accordingly.  Returns
 632  * zero on success and negative values on error.
 633  *
 634  */
 635 static int netlbl_cipsov4_listall(struct sk_buff *skb,
 636                                   struct netlink_callback *cb)
 637 {
 638         struct netlbl_cipsov4_doiwalk_arg cb_arg;
 639         u32 doi_skip = cb->args[0];
 640
 641         cb_arg.nl_cb = cb;
 642         cb_arg.skb = skb;
 643         cb_arg.seq = cb->nlh->nlmsg_seq;
 644
 645         cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
 646
 647         cb->args[0] = doi_skip;
 648         return skb->len;
 649 }
 650
 651 /**
 652  * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
 653  * @entry: LSM domain mapping entry
 654  * @arg: the netlbl_domhsh_walk_arg structure
 655  *
 656  * Description:
 657  * This function is intended for use by netlbl_cipsov4_remove() as the callback
 658  * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
 659  * which are associated with the CIPSO DOI specified in @arg.  Returns zero on
 660  * success, negative values on failure.
 661  *
 662  */
 663 static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
 664 {
 665         struct netlbl_domhsh_walk_arg *cb_arg = arg;
 666
 667         if (entry->type == NETLBL_NLTYPE_CIPSOV4 &&
 668             entry->type_def.cipsov4->doi == cb_arg->doi)
 669                 return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
 670
 671         return 0;
 672 }
 673
 674 /**
 675  * netlbl_cipsov4_remove - Handle a REMOVE message
 676  * @skb: the NETLINK buffer
 677  * @info: the Generic NETLINK info block
 678  *
 679  * Description:
 680  * Process a user generated REMOVE message and respond accordingly.  Returns
 681  * zero on success, negative values on failure.
 682  *
 683  */
 684 static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 685 {
 686         int ret_val = -EINVAL;
 687         u32 doi = 0;
 688         struct netlbl_domhsh_walk_arg cb_arg;
 689         struct audit_buffer *audit_buf;
 690         struct netlbl_audit audit_info;
 691         u32 skip_bkt = 0;
 692         u32 skip_chain = 0;
 693
 694         if (!info->attrs[NLBL_CIPSOV4_A_DOI])
 695                 return -EINVAL;
 696
 697         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 698         netlbl_netlink_auditinfo(skb, &audit_info);
 699
 700         cb_arg.doi = doi;
 701         cb_arg.audit_info = &audit_info;
 702         ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
 703                                      netlbl_cipsov4_remove_cb, &cb_arg);
 704         if (ret_val == 0 || ret_val == -ENOENT) {
 705                 ret_val = cipso_v4_doi_remove(doi, &audit_info);
 706                 if (ret_val == 0)
 707                         atomic_dec(&netlabel_mgmt_protocount);
 708         }
 709
 710         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
 711                                               &audit_info);
 712         if (audit_buf != NULL) {
 713                 audit_log_format(audit_buf,
 714                                  " cipso_doi=%u res=%u",
 715                                  doi,
 716                                  ret_val == 0 ? 1 : 0);
 717                 audit_log_end(audit_buf);
 718         }
 719
 720         return ret_val;
 721 }
 722
 723 /*
 724  * NetLabel Generic NETLINK Command Definitions
 725  */
 726
 727 static struct genl_ops netlbl_cipsov4_ops[] = {
 728         {
 729         .cmd = NLBL_CIPSOV4_C_ADD,
 730         .flags = GENL_ADMIN_PERM,
 731         .policy = netlbl_cipsov4_genl_policy,
 732         .doit = netlbl_cipsov4_add,
 733         .dumpit = NULL,
 734         },
 735         {
 736         .cmd = NLBL_CIPSOV4_C_REMOVE,
 737         .flags = GENL_ADMIN_PERM,
 738         .policy = netlbl_cipsov4_genl_policy,
 739         .doit = netlbl_cipsov4_remove,
 740         .dumpit = NULL,
 741         },
 742         {
 743         .cmd = NLBL_CIPSOV4_C_LIST,
 744         .flags = 0,
 745         .policy = netlbl_cipsov4_genl_policy,
 746         .doit = netlbl_cipsov4_list,
 747         .dumpit = NULL,
 748         },
 749         {
 750         .cmd = NLBL_CIPSOV4_C_LISTALL,
 751         .flags = 0,
 752         .policy = netlbl_cipsov4_genl_policy,
 753         .doit = NULL,
 754         .dumpit = netlbl_cipsov4_listall,
 755         },
 756 };
 757
 758 /*
 759  * NetLabel Generic NETLINK Protocol Functions
 760  */
 761
 762 /**
 763  * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
 764  *
 765  * Description:
 766  * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
 767  * mechanism.  Returns zero on success, negative values on failure.
 768  *
 769  */
 770 int __init netlbl_cipsov4_genl_init(void)
 771 {
 772         int ret_val, i;
 773
 774         ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
 775         if (ret_val != 0)
 776                 return ret_val;
 777
 778         for (i = 0; i < ARRAY_SIZE(netlbl_cipsov4_ops); i++) {
 779                 ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 780                                 &netlbl_cipsov4_ops[i]);
 781                 if (ret_val != 0)
 782                         return ret_val;
 783         }
 784
 785         return 0;
 786 }