linux/net/netlabel/netlabel_cipso_v4.c
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   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() */
  49struct 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() */
  56struct netlbl_domhsh_walk_arg {
  57        struct netlbl_audit *audit_info;
  58        u32 doi;
  59};
  60
  61/* NetLabel Generic NETLINK CIPSOv4 family */
  62static 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 */
  71static 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 */
 100static int netlbl_cipsov4_add_common(struct genl_info *info,
 101                                     struct cipso_v4_doi *doi_def)
 102{
 103        struct nlattr *nla;
 104        int nla_rem;
 105        u32 iter = 0;
 106
 107        doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 108
 109        if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
 110                                NLBL_CIPSOV4_A_MAX,
 111                                netlbl_cipsov4_genl_policy) != 0)
 112                return -EINVAL;
 113
 114        nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
 115                if (nla_type(nla) == NLBL_CIPSOV4_A_TAG) {
 116                        if (iter >= CIPSO_V4_TAG_MAXCNT)
 117                                return -EINVAL;
 118                        doi_def->tags[iter++] = nla_get_u8(nla);
 119                }
 120        while (iter < CIPSO_V4_TAG_MAXCNT)
 121                doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID;
 122
 123        return 0;
 124}
 125
 126/*
 127 * NetLabel Command Handlers
 128 */
 129
 130/**
 131 * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
 132 * @info: the Generic NETLINK info block
 133 * @audit_info: NetLabel audit information
 134 *
 135 * Description:
 136 * Create a new CIPSO_V4_MAP_TRANS DOI definition based on the given ADD
 137 * message and add it to the CIPSO V4 engine.  Return zero on success and
 138 * non-zero on error.
 139 *
 140 */
 141static int netlbl_cipsov4_add_std(struct genl_info *info,
 142                                  struct netlbl_audit *audit_info)
 143{
 144        int ret_val = -EINVAL;
 145        struct cipso_v4_doi *doi_def = NULL;
 146        struct nlattr *nla_a;
 147        struct nlattr *nla_b;
 148        int nla_a_rem;
 149        int nla_b_rem;
 150        u32 iter;
 151
 152        if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
 153            !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
 154                return -EINVAL;
 155
 156        if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 157                                NLBL_CIPSOV4_A_MAX,
 158                                netlbl_cipsov4_genl_policy) != 0)
 159                return -EINVAL;
 160
 161        doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 162        if (doi_def == NULL)
 163                return -ENOMEM;
 164        doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
 165        if (doi_def->map.std == NULL) {
 166                ret_val = -ENOMEM;
 167                goto add_std_failure;
 168        }
 169        doi_def->type = CIPSO_V4_MAP_TRANS;
 170
 171        ret_val = netlbl_cipsov4_add_common(info, doi_def);
 172        if (ret_val != 0)
 173                goto add_std_failure;
 174        ret_val = -EINVAL;
 175
 176        nla_for_each_nested(nla_a,
 177                            info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 178                            nla_a_rem)
 179                if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
 180                        if (nla_validate_nested(nla_a,
 181                                            NLBL_CIPSOV4_A_MAX,
 182                                            netlbl_cipsov4_genl_policy) != 0)
 183                                        goto add_std_failure;
 184                        nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 185                                switch (nla_type(nla_b)) {
 186                                case NLBL_CIPSOV4_A_MLSLVLLOC:
 187                                        if (nla_get_u32(nla_b) >
 188                                            CIPSO_V4_MAX_LOC_LVLS)
 189                                                goto add_std_failure;
 190                                        if (nla_get_u32(nla_b) >=
 191                                            doi_def->map.std->lvl.local_size)
 192                                             doi_def->map.std->lvl.local_size =
 193                                                     nla_get_u32(nla_b) + 1;
 194                                        break;
 195                                case NLBL_CIPSOV4_A_MLSLVLREM:
 196                                        if (nla_get_u32(nla_b) >
 197                                            CIPSO_V4_MAX_REM_LVLS)
 198                                                goto add_std_failure;
 199                                        if (nla_get_u32(nla_b) >=
 200                                            doi_def->map.std->lvl.cipso_size)
 201                                             doi_def->map.std->lvl.cipso_size =
 202                                                     nla_get_u32(nla_b) + 1;
 203                                        break;
 204                                }
 205                }
 206        doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
 207                                              sizeof(u32),
 208                                              GFP_KERNEL);
 209        if (doi_def->map.std->lvl.local == NULL) {
 210                ret_val = -ENOMEM;
 211                goto add_std_failure;
 212        }
 213        doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
 214                                              sizeof(u32),
 215                                              GFP_KERNEL);
 216        if (doi_def->map.std->lvl.cipso == NULL) {
 217                ret_val = -ENOMEM;
 218                goto add_std_failure;
 219        }
 220        for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
 221                doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
 222        for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
 223                doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
 224        nla_for_each_nested(nla_a,
 225                            info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
 226                            nla_a_rem)
 227                if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
 228                        struct nlattr *lvl_loc;
 229                        struct nlattr *lvl_rem;
 230
 231                        lvl_loc = nla_find_nested(nla_a,
 232                                                  NLBL_CIPSOV4_A_MLSLVLLOC);
 233                        lvl_rem = nla_find_nested(nla_a,
 234                                                  NLBL_CIPSOV4_A_MLSLVLREM);
 235                        if (lvl_loc == NULL || lvl_rem == NULL)
 236                                goto add_std_failure;
 237                        doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
 238                                nla_get_u32(lvl_rem);
 239                        doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
 240                                nla_get_u32(lvl_loc);
 241                }
 242
 243        if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
 244                if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 245                                        NLBL_CIPSOV4_A_MAX,
 246                                        netlbl_cipsov4_genl_policy) != 0)
 247                        goto add_std_failure;
 248
 249                nla_for_each_nested(nla_a,
 250                                    info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 251                                    nla_a_rem)
 252                        if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 253                                if (nla_validate_nested(nla_a,
 254                                              NLBL_CIPSOV4_A_MAX,
 255                                              netlbl_cipsov4_genl_policy) != 0)
 256                                        goto add_std_failure;
 257                                nla_for_each_nested(nla_b, nla_a, nla_b_rem)
 258                                        switch (nla_type(nla_b)) {
 259                                        case NLBL_CIPSOV4_A_MLSCATLOC:
 260                                                if (nla_get_u32(nla_b) >
 261                                                    CIPSO_V4_MAX_LOC_CATS)
 262                                                        goto add_std_failure;
 263                                                if (nla_get_u32(nla_b) >=
 264                                              doi_def->map.std->cat.local_size)
 265                                             doi_def->map.std->cat.local_size =
 266                                                     nla_get_u32(nla_b) + 1;
 267                                                break;
 268                                        case NLBL_CIPSOV4_A_MLSCATREM:
 269                                                if (nla_get_u32(nla_b) >
 270                                                    CIPSO_V4_MAX_REM_CATS)
 271                                                        goto add_std_failure;
 272                                                if (nla_get_u32(nla_b) >=
 273                                              doi_def->map.std->cat.cipso_size)
 274                                             doi_def->map.std->cat.cipso_size =
 275                                                     nla_get_u32(nla_b) + 1;
 276                                                break;
 277                                        }
 278                        }
 279                doi_def->map.std->cat.local = kcalloc(
 280                                              doi_def->map.std->cat.local_size,
 281                                              sizeof(u32),
 282                                              GFP_KERNEL);
 283                if (doi_def->map.std->cat.local == NULL) {
 284                        ret_val = -ENOMEM;
 285                        goto add_std_failure;
 286                }
 287                doi_def->map.std->cat.cipso = kcalloc(
 288                                              doi_def->map.std->cat.cipso_size,
 289                                              sizeof(u32),
 290                                              GFP_KERNEL);
 291                if (doi_def->map.std->cat.cipso == NULL) {
 292                        ret_val = -ENOMEM;
 293                        goto add_std_failure;
 294                }
 295                for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
 296                        doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
 297                for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
 298                        doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
 299                nla_for_each_nested(nla_a,
 300                                    info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
 301                                    nla_a_rem)
 302                        if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
 303                                struct nlattr *cat_loc;
 304                                struct nlattr *cat_rem;
 305
 306                                cat_loc = nla_find_nested(nla_a,
 307                                                     NLBL_CIPSOV4_A_MLSCATLOC);
 308                                cat_rem = nla_find_nested(nla_a,
 309                                                     NLBL_CIPSOV4_A_MLSCATREM);
 310                                if (cat_loc == NULL || cat_rem == NULL)
 311                                        goto add_std_failure;
 312                                doi_def->map.std->cat.local[
 313                                                        nla_get_u32(cat_loc)] =
 314                                        nla_get_u32(cat_rem);
 315                                doi_def->map.std->cat.cipso[
 316                                                        nla_get_u32(cat_rem)] =
 317                                        nla_get_u32(cat_loc);
 318                        }
 319        }
 320
 321        ret_val = cipso_v4_doi_add(doi_def, audit_info);
 322        if (ret_val != 0)
 323                goto add_std_failure;
 324        return 0;
 325
 326add_std_failure:
 327        if (doi_def)
 328                cipso_v4_doi_free(doi_def);
 329        return ret_val;
 330}
 331
 332/**
 333 * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
 334 * @info: the Generic NETLINK info block
 335 * @audit_info: NetLabel audit information
 336 *
 337 * Description:
 338 * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
 339 * and add it to the CIPSO V4 engine.  Return zero on success and non-zero on
 340 * error.
 341 *
 342 */
 343static int netlbl_cipsov4_add_pass(struct genl_info *info,
 344                                   struct netlbl_audit *audit_info)
 345{
 346        int ret_val;
 347        struct cipso_v4_doi *doi_def = NULL;
 348
 349        if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 350                return -EINVAL;
 351
 352        doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 353        if (doi_def == NULL)
 354                return -ENOMEM;
 355        doi_def->type = CIPSO_V4_MAP_PASS;
 356
 357        ret_val = netlbl_cipsov4_add_common(info, doi_def);
 358        if (ret_val != 0)
 359                goto add_pass_failure;
 360
 361        ret_val = cipso_v4_doi_add(doi_def, audit_info);
 362        if (ret_val != 0)
 363                goto add_pass_failure;
 364        return 0;
 365
 366add_pass_failure:
 367        cipso_v4_doi_free(doi_def);
 368        return ret_val;
 369}
 370
 371/**
 372 * netlbl_cipsov4_add_local - Adds a CIPSO V4 DOI definition
 373 * @info: the Generic NETLINK info block
 374 * @audit_info: NetLabel audit information
 375 *
 376 * Description:
 377 * Create a new CIPSO_V4_MAP_LOCAL DOI definition based on the given ADD
 378 * message and add it to the CIPSO V4 engine.  Return zero on success and
 379 * non-zero on error.
 380 *
 381 */
 382static int netlbl_cipsov4_add_local(struct genl_info *info,
 383                                    struct netlbl_audit *audit_info)
 384{
 385        int ret_val;
 386        struct cipso_v4_doi *doi_def = NULL;
 387
 388        if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
 389                return -EINVAL;
 390
 391        doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
 392        if (doi_def == NULL)
 393                return -ENOMEM;
 394        doi_def->type = CIPSO_V4_MAP_LOCAL;
 395
 396        ret_val = netlbl_cipsov4_add_common(info, doi_def);
 397        if (ret_val != 0)
 398                goto add_local_failure;
 399
 400        ret_val = cipso_v4_doi_add(doi_def, audit_info);
 401        if (ret_val != 0)
 402                goto add_local_failure;
 403        return 0;
 404
 405add_local_failure:
 406        cipso_v4_doi_free(doi_def);
 407        return ret_val;
 408}
 409
 410/**
 411 * netlbl_cipsov4_add - Handle an ADD message
 412 * @skb: the NETLINK buffer
 413 * @info: the Generic NETLINK info block
 414 *
 415 * Description:
 416 * Create a new DOI definition based on the given ADD message and add it to the
 417 * CIPSO V4 engine.  Returns zero on success, negative values on failure.
 418 *
 419 */
 420static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
 421
 422{
 423        int ret_val = -EINVAL;
 424        const char *type_str = "(unknown)";
 425        struct netlbl_audit audit_info;
 426
 427        if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
 428            !info->attrs[NLBL_CIPSOV4_A_MTYPE])
 429                return -EINVAL;
 430
 431        netlbl_netlink_auditinfo(skb, &audit_info);
 432        switch (nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE])) {
 433        case CIPSO_V4_MAP_TRANS:
 434                type_str = "trans";
 435                ret_val = netlbl_cipsov4_add_std(info, &audit_info);
 436                break;
 437        case CIPSO_V4_MAP_PASS:
 438                type_str = "pass";
 439                ret_val = netlbl_cipsov4_add_pass(info, &audit_info);
 440                break;
 441        case CIPSO_V4_MAP_LOCAL:
 442                type_str = "local";
 443                ret_val = netlbl_cipsov4_add_local(info, &audit_info);
 444                break;
 445        }
 446        if (ret_val == 0)
 447                atomic_inc(&netlabel_mgmt_protocount);
 448
 449        return ret_val;
 450}
 451
 452/**
 453 * netlbl_cipsov4_list - Handle a LIST message
 454 * @skb: the NETLINK buffer
 455 * @info: the Generic NETLINK info block
 456 *
 457 * Description:
 458 * Process a user generated LIST message and respond accordingly.  While the
 459 * response message generated by the kernel is straightforward, determining
 460 * before hand the size of the buffer to allocate is not (we have to generate
 461 * the message to know the size).  In order to keep this function sane what we
 462 * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
 463 * that size, if we fail then we restart with a larger buffer and try again.
 464 * We continue in this manner until we hit a limit of failed attempts then we
 465 * give up and just send an error message.  Returns zero on success and
 466 * negative values on error.
 467 *
 468 */
 469static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
 470{
 471        int ret_val;
 472        struct sk_buff *ans_skb = NULL;
 473        u32 nlsze_mult = 1;
 474        void *data;
 475        u32 doi;
 476        struct nlattr *nla_a;
 477        struct nlattr *nla_b;
 478        struct cipso_v4_doi *doi_def;
 479        u32 iter;
 480
 481        if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
 482                ret_val = -EINVAL;
 483                goto list_failure;
 484        }
 485
 486list_start:
 487        ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
 488        if (ans_skb == NULL) {
 489                ret_val = -ENOMEM;
 490                goto list_failure;
 491        }
 492        data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
 493                                 0, NLBL_CIPSOV4_C_LIST);
 494        if (data == NULL) {
 495                ret_val = -ENOMEM;
 496                goto list_failure;
 497        }
 498
 499        doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 500
 501        rcu_read_lock();
 502        doi_def = cipso_v4_doi_getdef(doi);
 503        if (doi_def == NULL) {
 504                ret_val = -EINVAL;
 505                goto list_failure_lock;
 506        }
 507
 508        ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
 509        if (ret_val != 0)
 510                goto list_failure_lock;
 511
 512        nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
 513        if (nla_a == NULL) {
 514                ret_val = -ENOMEM;
 515                goto list_failure_lock;
 516        }
 517        for (iter = 0;
 518             iter < CIPSO_V4_TAG_MAXCNT &&
 519               doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
 520             iter++) {
 521                ret_val = nla_put_u8(ans_skb,
 522                                     NLBL_CIPSOV4_A_TAG,
 523                                     doi_def->tags[iter]);
 524                if (ret_val != 0)
 525                        goto list_failure_lock;
 526        }
 527        nla_nest_end(ans_skb, nla_a);
 528
 529        switch (doi_def->type) {
 530        case CIPSO_V4_MAP_TRANS:
 531                nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
 532                if (nla_a == NULL) {
 533                        ret_val = -ENOMEM;
 534                        goto list_failure_lock;
 535                }
 536                for (iter = 0;
 537                     iter < doi_def->map.std->lvl.local_size;
 538                     iter++) {
 539                        if (doi_def->map.std->lvl.local[iter] ==
 540                            CIPSO_V4_INV_LVL)
 541                                continue;
 542
 543                        nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
 544                        if (nla_b == NULL) {
 545                                ret_val = -ENOMEM;
 546                                goto list_retry;
 547                        }
 548                        ret_val = nla_put_u32(ans_skb,
 549                                              NLBL_CIPSOV4_A_MLSLVLLOC,
 550                                              iter);
 551                        if (ret_val != 0)
 552                                goto list_retry;
 553                        ret_val = nla_put_u32(ans_skb,
 554                                            NLBL_CIPSOV4_A_MLSLVLREM,
 555                                            doi_def->map.std->lvl.local[iter]);
 556                        if (ret_val != 0)
 557                                goto list_retry;
 558                        nla_nest_end(ans_skb, nla_b);
 559                }
 560                nla_nest_end(ans_skb, nla_a);
 561
 562                nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
 563                if (nla_a == NULL) {
 564                        ret_val = -ENOMEM;
 565                        goto list_retry;
 566                }
 567                for (iter = 0;
 568                     iter < doi_def->map.std->cat.local_size;
 569                     iter++) {
 570                        if (doi_def->map.std->cat.local[iter] ==
 571                            CIPSO_V4_INV_CAT)
 572                                continue;
 573
 574                        nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
 575                        if (nla_b == NULL) {
 576                                ret_val = -ENOMEM;
 577                                goto list_retry;
 578                        }
 579                        ret_val = nla_put_u32(ans_skb,
 580                                              NLBL_CIPSOV4_A_MLSCATLOC,
 581                                              iter);
 582                        if (ret_val != 0)
 583                                goto list_retry;
 584                        ret_val = nla_put_u32(ans_skb,
 585                                            NLBL_CIPSOV4_A_MLSCATREM,
 586                                            doi_def->map.std->cat.local[iter]);
 587                        if (ret_val != 0)
 588                                goto list_retry;
 589                        nla_nest_end(ans_skb, nla_b);
 590                }
 591                nla_nest_end(ans_skb, nla_a);
 592
 593                break;
 594        }
 595        rcu_read_unlock();
 596
 597        genlmsg_end(ans_skb, data);
 598        return genlmsg_reply(ans_skb, info);
 599
 600list_retry:
 601        /* XXX - this limit is a guesstimate */
 602        if (nlsze_mult < 4) {
 603                rcu_read_unlock();
 604                kfree_skb(ans_skb);
 605                nlsze_mult *= 2;
 606                goto list_start;
 607        }
 608list_failure_lock:
 609        rcu_read_unlock();
 610list_failure:
 611        kfree_skb(ans_skb);
 612        return ret_val;
 613}
 614
 615/**
 616 * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
 617 * @doi_def: the CIPSOv4 DOI definition
 618 * @arg: the netlbl_cipsov4_doiwalk_arg structure
 619 *
 620 * Description:
 621 * This function is designed to be used as a callback to the
 622 * cipso_v4_doi_walk() function for use in generating a response for a LISTALL
 623 * message.  Returns the size of the message on success, negative values on
 624 * failure.
 625 *
 626 */
 627static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
 628{
 629        int ret_val = -ENOMEM;
 630        struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
 631        void *data;
 632
 633        data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
 634                           cb_arg->seq, &netlbl_cipsov4_gnl_family,
 635                           NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
 636        if (data == NULL)
 637                goto listall_cb_failure;
 638
 639        ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
 640        if (ret_val != 0)
 641                goto listall_cb_failure;
 642        ret_val = nla_put_u32(cb_arg->skb,
 643                              NLBL_CIPSOV4_A_MTYPE,
 644                              doi_def->type);
 645        if (ret_val != 0)
 646                goto listall_cb_failure;
 647
 648        return genlmsg_end(cb_arg->skb, data);
 649
 650listall_cb_failure:
 651        genlmsg_cancel(cb_arg->skb, data);
 652        return ret_val;
 653}
 654
 655/**
 656 * netlbl_cipsov4_listall - Handle a LISTALL message
 657 * @skb: the NETLINK buffer
 658 * @cb: the NETLINK callback
 659 *
 660 * Description:
 661 * Process a user generated LISTALL message and respond accordingly.  Returns
 662 * zero on success and negative values on error.
 663 *
 664 */
 665static int netlbl_cipsov4_listall(struct sk_buff *skb,
 666                                  struct netlink_callback *cb)
 667{
 668        struct netlbl_cipsov4_doiwalk_arg cb_arg;
 669        u32 doi_skip = cb->args[0];
 670
 671        cb_arg.nl_cb = cb;
 672        cb_arg.skb = skb;
 673        cb_arg.seq = cb->nlh->nlmsg_seq;
 674
 675        cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
 676
 677        cb->args[0] = doi_skip;
 678        return skb->len;
 679}
 680
 681/**
 682 * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
 683 * @entry: LSM domain mapping entry
 684 * @arg: the netlbl_domhsh_walk_arg structure
 685 *
 686 * Description:
 687 * This function is intended for use by netlbl_cipsov4_remove() as the callback
 688 * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
 689 * which are associated with the CIPSO DOI specified in @arg.  Returns zero on
 690 * success, negative values on failure.
 691 *
 692 */
 693static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
 694{
 695        struct netlbl_domhsh_walk_arg *cb_arg = arg;
 696
 697        if (entry->type == NETLBL_NLTYPE_CIPSOV4 &&
 698            entry->type_def.cipsov4->doi == cb_arg->doi)
 699                return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
 700
 701        return 0;
 702}
 703
 704/**
 705 * netlbl_cipsov4_remove - Handle a REMOVE message
 706 * @skb: the NETLINK buffer
 707 * @info: the Generic NETLINK info block
 708 *
 709 * Description:
 710 * Process a user generated REMOVE message and respond accordingly.  Returns
 711 * zero on success, negative values on failure.
 712 *
 713 */
 714static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 715{
 716        int ret_val = -EINVAL;
 717        struct netlbl_domhsh_walk_arg cb_arg;
 718        struct netlbl_audit audit_info;
 719        u32 skip_bkt = 0;
 720        u32 skip_chain = 0;
 721
 722        if (!info->attrs[NLBL_CIPSOV4_A_DOI])
 723                return -EINVAL;
 724
 725        netlbl_netlink_auditinfo(skb, &audit_info);
 726        cb_arg.doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
 727        cb_arg.audit_info = &audit_info;
 728        ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
 729                                     netlbl_cipsov4_remove_cb, &cb_arg);
 730        if (ret_val == 0 || ret_val == -ENOENT) {
 731                ret_val = cipso_v4_doi_remove(cb_arg.doi, &audit_info);
 732                if (ret_val == 0)
 733                        atomic_dec(&netlabel_mgmt_protocount);
 734        }
 735
 736        return ret_val;
 737}
 738
 739/*
 740 * NetLabel Generic NETLINK Command Definitions
 741 */
 742
 743static struct genl_ops netlbl_cipsov4_ops[] = {
 744        {
 745        .cmd = NLBL_CIPSOV4_C_ADD,
 746        .flags = GENL_ADMIN_PERM,
 747        .policy = netlbl_cipsov4_genl_policy,
 748        .doit = netlbl_cipsov4_add,
 749        .dumpit = NULL,
 750        },
 751        {
 752        .cmd = NLBL_CIPSOV4_C_REMOVE,
 753        .flags = GENL_ADMIN_PERM,
 754        .policy = netlbl_cipsov4_genl_policy,
 755        .doit = netlbl_cipsov4_remove,
 756        .dumpit = NULL,
 757        },
 758        {
 759        .cmd = NLBL_CIPSOV4_C_LIST,
 760        .flags = 0,
 761        .policy = netlbl_cipsov4_genl_policy,
 762        .doit = netlbl_cipsov4_list,
 763        .dumpit = NULL,
 764        },
 765        {
 766        .cmd = NLBL_CIPSOV4_C_LISTALL,
 767        .flags = 0,
 768        .policy = netlbl_cipsov4_genl_policy,
 769        .doit = NULL,
 770        .dumpit = netlbl_cipsov4_listall,
 771        },
 772};
 773
 774/*
 775 * NetLabel Generic NETLINK Protocol Functions
 776 */
 777
 778/**
 779 * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
 780 *
 781 * Description:
 782 * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
 783 * mechanism.  Returns zero on success, negative values on failure.
 784 *
 785 */
 786int __init netlbl_cipsov4_genl_init(void)
 787{
 788        int ret_val, i;
 789
 790        ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
 791        if (ret_val != 0)
 792                return ret_val;
 793
 794        for (i = 0; i < ARRAY_SIZE(netlbl_cipsov4_ops); i++) {
 795                ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
 796                                &netlbl_cipsov4_ops[i]);
 797                if (ret_val != 0)
 798                        return ret_val;
 799        }
 800
 801        return 0;
 802}
 803