LXR linux/net/netlabel/netlabel

   1/*
   2 * NetLabel Management Support
   3 *
   4 * This file defines the management functions for the NetLabel system.  The
   5 * NetLabel system manages static and dynamic label mappings for network
   6 * protocols such as CIPSO and RIPSO.
   7 *
   8 * Author: Paul Moore <paul@paul-moore.com>
   9 *
  10 */
  11
  12/*
  13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
  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, see <http://www.gnu.org/licenses/>.
  27 *
  28 */
  29
  30#include <linux/types.h>
  31#include <linux/socket.h>
  32#include <linux/string.h>
  33#include <linux/skbuff.h>
  34#include <linux/in.h>
  35#include <linux/in6.h>
  36#include <linux/slab.h>
  37#include <net/sock.h>
  38#include <net/netlink.h>
  39#include <net/genetlink.h>
  40#include <net/ip.h>
  41#include <net/ipv6.h>
  42#include <net/netlabel.h>
  43#include <net/cipso_ipv4.h>
  44#include <linux/atomic.h>
  45
  46#include "netlabel_domainhash.h"
  47#include "netlabel_user.h"
  48#include "netlabel_mgmt.h"
  49
  50/* NetLabel configured protocol counter */
  51atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
  52
  53/* Argument struct for netlbl_domhsh_walk() */
  54struct netlbl_domhsh_walk_arg {
  55        struct netlink_callback *nl_cb;
  56        struct sk_buff *skb;
  57        u32 seq;
  58};
  59
  60/* NetLabel Generic NETLINK CIPSOv4 family */
  61static struct genl_family netlbl_mgmt_gnl_family = {
  62        .id = GENL_ID_GENERATE,
  63        .hdrsize = 0,
  64        .name = NETLBL_NLTYPE_MGMT_NAME,
  65        .version = NETLBL_PROTO_VERSION,
  66        .maxattr = NLBL_MGMT_A_MAX,
  67};
  68
  69/* NetLabel Netlink attribute policy */
  70static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
  71        [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
  72        [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
  73        [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
  74        [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
  75};
  76
  77/*
  78 * Helper Functions
  79 */
  80
  81/**
  82 * netlbl_mgmt_add - Handle an ADD message
  83 * @info: the Generic NETLINK info block
  84 * @audit_info: NetLabel audit information
  85 *
  86 * Description:
  87 * Helper function for the ADD and ADDDEF messages to add the domain mappings
  88 * from the message to the hash table.  See netlabel.h for a description of the
  89 * message format.  Returns zero on success, negative values on failure.
  90 *
  91 */
  92static int netlbl_mgmt_add_common(struct genl_info *info,
  93                                  struct netlbl_audit *audit_info)
  94{
  95        int ret_val = -EINVAL;
  96        struct netlbl_domaddr_map *addrmap = NULL;
  97        struct cipso_v4_doi *cipsov4 = NULL;
  98        u32 tmp_val;
  99        struct netlbl_dom_map *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 100
 101        if (!entry)
 102                return -ENOMEM;
 103        entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
 104        if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
 105                size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
 106                entry->domain = kmalloc(tmp_size, GFP_KERNEL);
 107                if (entry->domain == NULL) {
 108                        ret_val = -ENOMEM;
 109                        goto add_free_entry;
 110                }
 111                nla_strlcpy(entry->domain,
 112                            info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
 113        }
 114
 115        /* NOTE: internally we allow/use a entry->def.type value of
 116         *       NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
 117         *       to pass that as a protocol value because we need to know the
 118         *       "real" protocol */
 119
 120        switch (entry->def.type) {
 121        case NETLBL_NLTYPE_UNLABELED:
 122                break;
 123        case NETLBL_NLTYPE_CIPSOV4:
 124                if (!info->attrs[NLBL_MGMT_A_CV4DOI])
 125                        goto add_free_domain;
 126
 127                tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
 128                cipsov4 = cipso_v4_doi_getdef(tmp_val);
 129                if (cipsov4 == NULL)
 130                        goto add_free_domain;
 131                entry->def.cipso = cipsov4;
 132                break;
 133        default:
 134                goto add_free_domain;
 135        }
 136
 137        if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
 138                struct in_addr *addr;
 139                struct in_addr *mask;
 140                struct netlbl_domaddr4_map *map;
 141
 142                addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
 143                if (addrmap == NULL) {
 144                        ret_val = -ENOMEM;
 145                        goto add_doi_put_def;
 146                }
 147                INIT_LIST_HEAD(&addrmap->list4);
 148                INIT_LIST_HEAD(&addrmap->list6);
 149
 150                if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
 151                    sizeof(struct in_addr)) {
 152                        ret_val = -EINVAL;
 153                        goto add_free_addrmap;
 154                }
 155                if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
 156                    sizeof(struct in_addr)) {
 157                        ret_val = -EINVAL;
 158                        goto add_free_addrmap;
 159                }
 160                addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
 161                mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
 162
 163                map = kzalloc(sizeof(*map), GFP_KERNEL);
 164                if (map == NULL) {
 165                        ret_val = -ENOMEM;
 166                        goto add_free_addrmap;
 167                }
 168                map->list.addr = addr->s_addr & mask->s_addr;
 169                map->list.mask = mask->s_addr;
 170                map->list.valid = 1;
 171                map->def.type = entry->def.type;
 172                if (cipsov4)
 173                        map->def.cipso = cipsov4;
 174
 175                ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
 176                if (ret_val != 0) {
 177                        kfree(map);
 178                        goto add_free_addrmap;
 179                }
 180
 181                entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 182                entry->def.addrsel = addrmap;
 183#if IS_ENABLED(CONFIG_IPV6)
 184        } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
 185                struct in6_addr *addr;
 186                struct in6_addr *mask;
 187                struct netlbl_domaddr6_map *map;
 188
 189                addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
 190                if (addrmap == NULL) {
 191                        ret_val = -ENOMEM;
 192                        goto add_doi_put_def;
 193                }
 194                INIT_LIST_HEAD(&addrmap->list4);
 195                INIT_LIST_HEAD(&addrmap->list6);
 196
 197                if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
 198                    sizeof(struct in6_addr)) {
 199                        ret_val = -EINVAL;
 200                        goto add_free_addrmap;
 201                }
 202                if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
 203                    sizeof(struct in6_addr)) {
 204                        ret_val = -EINVAL;
 205                        goto add_free_addrmap;
 206                }
 207                addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
 208                mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
 209
 210                map = kzalloc(sizeof(*map), GFP_KERNEL);
 211                if (map == NULL) {
 212                        ret_val = -ENOMEM;
 213                        goto add_free_addrmap;
 214                }
 215                map->list.addr = *addr;
 216                map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
 217                map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
 218                map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
 219                map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
 220                map->list.mask = *mask;
 221                map->list.valid = 1;
 222                map->def.type = entry->def.type;
 223
 224                ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
 225                if (ret_val != 0) {
 226                        kfree(map);
 227                        goto add_free_addrmap;
 228                }
 229
 230                entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 231                entry->def.addrsel = addrmap;
 232#endif /* IPv6 */
 233        }
 234
 235        ret_val = netlbl_domhsh_add(entry, audit_info);
 236        if (ret_val != 0)
 237                goto add_free_addrmap;
 238
 239        return 0;
 240
 241add_free_addrmap:
 242        kfree(addrmap);
 243add_doi_put_def:
 244        cipso_v4_doi_putdef(cipsov4);
 245add_free_domain:
 246        kfree(entry->domain);
 247add_free_entry:
 248        kfree(entry);
 249        return ret_val;
 250}
 251
 252/**
 253 * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
 254 * @skb: the NETLINK buffer
 255 * @entry: the map entry
 256 *
 257 * Description:
 258 * This function is a helper function used by the LISTALL and LISTDEF command
 259 * handlers.  The caller is responsible for ensuring that the RCU read lock
 260 * is held.  Returns zero on success, negative values on failure.
 261 *
 262 */
 263static int netlbl_mgmt_listentry(struct sk_buff *skb,
 264                                 struct netlbl_dom_map *entry)
 265{
 266        int ret_val = 0;
 267        struct nlattr *nla_a;
 268        struct nlattr *nla_b;
 269        struct netlbl_af4list *iter4;
 270#if IS_ENABLED(CONFIG_IPV6)
 271        struct netlbl_af6list *iter6;
 272#endif
 273
 274        if (entry->domain != NULL) {
 275                ret_val = nla_put_string(skb,
 276                                         NLBL_MGMT_A_DOMAIN, entry->domain);
 277                if (ret_val != 0)
 278                        return ret_val;
 279        }
 280
 281        switch (entry->def.type) {
 282        case NETLBL_NLTYPE_ADDRSELECT:
 283                nla_a = nla_nest_start(skb, NLBL_MGMT_A_SELECTORLIST);
 284                if (nla_a == NULL)
 285                        return -ENOMEM;
 286
 287                netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
 288                        struct netlbl_domaddr4_map *map4;
 289                        struct in_addr addr_struct;
 290
 291                        nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
 292                        if (nla_b == NULL)
 293                                return -ENOMEM;
 294
 295                        addr_struct.s_addr = iter4->addr;
 296                        ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4ADDR,
 297                                                  addr_struct.s_addr);
 298                        if (ret_val != 0)
 299                                return ret_val;
 300                        addr_struct.s_addr = iter4->mask;
 301                        ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4MASK,
 302                                                  addr_struct.s_addr);
 303                        if (ret_val != 0)
 304                                return ret_val;
 305                        map4 = netlbl_domhsh_addr4_entry(iter4);
 306                        ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 307                                              map4->def.type);
 308                        if (ret_val != 0)
 309                                return ret_val;
 310                        switch (map4->def.type) {
 311                        case NETLBL_NLTYPE_CIPSOV4:
 312                                ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
 313                                                      map4->def.cipso->doi);
 314                                if (ret_val != 0)
 315                                        return ret_val;
 316                                break;
 317                        }
 318
 319                        nla_nest_end(skb, nla_b);
 320                }
 321#if IS_ENABLED(CONFIG_IPV6)
 322                netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
 323                        struct netlbl_domaddr6_map *map6;
 324
 325                        nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
 326                        if (nla_b == NULL)
 327                                return -ENOMEM;
 328
 329                        ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6ADDR,
 330                                                   &iter6->addr);
 331                        if (ret_val != 0)
 332                                return ret_val;
 333                        ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6MASK,
 334                                                   &iter6->mask);
 335                        if (ret_val != 0)
 336                                return ret_val;
 337                        map6 = netlbl_domhsh_addr6_entry(iter6);
 338                        ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 339                                              map6->def.type);
 340                        if (ret_val != 0)
 341                                return ret_val;
 342
 343                        nla_nest_end(skb, nla_b);
 344                }
 345#endif /* IPv6 */
 346
 347                nla_nest_end(skb, nla_a);
 348                break;
 349        case NETLBL_NLTYPE_UNLABELED:
 350                ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
 351                break;
 352        case NETLBL_NLTYPE_CIPSOV4:
 353                ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
 354                if (ret_val != 0)
 355                        return ret_val;
 356                ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
 357                                      entry->def.cipso->doi);
 358                break;
 359        }
 360
 361        return ret_val;
 362}
 363
 364/*
 365 * NetLabel Command Handlers
 366 */
 367
 368/**
 369 * netlbl_mgmt_add - Handle an ADD message
 370 * @skb: the NETLINK buffer
 371 * @info: the Generic NETLINK info block
 372 *
 373 * Description:
 374 * Process a user generated ADD message and add the domains from the message
 375 * to the hash table.  See netlabel.h for a description of the message format.
 376 * Returns zero on success, negative values on failure.
 377 *
 378 */
 379static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
 380{
 381        struct netlbl_audit audit_info;
 382
 383        if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
 384            (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
 385            (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
 386             info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 387            (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
 388             info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
 389            ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
 390             (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
 391            ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
 392             (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
 393                return -EINVAL;
 394
 395        netlbl_netlink_auditinfo(skb, &audit_info);
 396
 397        return netlbl_mgmt_add_common(info, &audit_info);
 398}
 399
 400/**
 401 * netlbl_mgmt_remove - Handle a REMOVE message
 402 * @skb: the NETLINK buffer
 403 * @info: the Generic NETLINK info block
 404 *
 405 * Description:
 406 * Process a user generated REMOVE message and remove the specified domain
 407 * mappings.  Returns zero on success, negative values on failure.
 408 *
 409 */
 410static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
 411{
 412        char *domain;
 413        struct netlbl_audit audit_info;
 414
 415        if (!info->attrs[NLBL_MGMT_A_DOMAIN])
 416                return -EINVAL;
 417
 418        netlbl_netlink_auditinfo(skb, &audit_info);
 419
 420        domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
 421        return netlbl_domhsh_remove(domain, &audit_info);
 422}
 423
 424/**
 425 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
 426 * @entry: the domain mapping hash table entry
 427 * @arg: the netlbl_domhsh_walk_arg structure
 428 *
 429 * Description:
 430 * This function is designed to be used as a callback to the
 431 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
 432 * message.  Returns the size of the message on success, negative values on
 433 * failure.
 434 *
 435 */
 436static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
 437{
 438        int ret_val = -ENOMEM;
 439        struct netlbl_domhsh_walk_arg *cb_arg = arg;
 440        void *data;
 441
 442        data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
 443                           cb_arg->seq, &netlbl_mgmt_gnl_family,
 444                           NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
 445        if (data == NULL)
 446                goto listall_cb_failure;
 447
 448        ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
 449        if (ret_val != 0)
 450                goto listall_cb_failure;
 451
 452        cb_arg->seq++;
 453        genlmsg_end(cb_arg->skb, data);
 454        return 0;
 455
 456listall_cb_failure:
 457        genlmsg_cancel(cb_arg->skb, data);
 458        return ret_val;
 459}
 460
 461/**
 462 * netlbl_mgmt_listall - Handle a LISTALL message
 463 * @skb: the NETLINK buffer
 464 * @cb: the NETLINK callback
 465 *
 466 * Description:
 467 * Process a user generated LISTALL message and dumps the domain hash table in
 468 * a form suitable for use in a kernel generated LISTALL message.  Returns zero
 469 * on success, negative values on failure.
 470 *
 471 */
 472static int netlbl_mgmt_listall(struct sk_buff *skb,
 473                               struct netlink_callback *cb)
 474{
 475        struct netlbl_domhsh_walk_arg cb_arg;
 476        u32 skip_bkt = cb->args[0];
 477        u32 skip_chain = cb->args[1];
 478
 479        cb_arg.nl_cb = cb;
 480        cb_arg.skb = skb;
 481        cb_arg.seq = cb->nlh->nlmsg_seq;
 482
 483        netlbl_domhsh_walk(&skip_bkt,
 484                           &skip_chain,
 485                           netlbl_mgmt_listall_cb,
 486                           &cb_arg);
 487
 488        cb->args[0] = skip_bkt;
 489        cb->args[1] = skip_chain;
 490        return skb->len;
 491}
 492
 493/**
 494 * netlbl_mgmt_adddef - Handle an ADDDEF message
 495 * @skb: the NETLINK buffer
 496 * @info: the Generic NETLINK info block
 497 *
 498 * Description:
 499 * Process a user generated ADDDEF message and respond accordingly.  Returns
 500 * zero on success, negative values on failure.
 501 *
 502 */
 503static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
 504{
 505        struct netlbl_audit audit_info;
 506
 507        if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
 508            (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
 509             info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 510            (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
 511             info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
 512            ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
 513             (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
 514            ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
 515             (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
 516                return -EINVAL;
 517
 518        netlbl_netlink_auditinfo(skb, &audit_info);
 519
 520        return netlbl_mgmt_add_common(info, &audit_info);
 521}
 522
 523/**
 524 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
 525 * @skb: the NETLINK buffer
 526 * @info: the Generic NETLINK info block
 527 *
 528 * Description:
 529 * Process a user generated REMOVEDEF message and remove the default domain
 530 * mapping.  Returns zero on success, negative values on failure.
 531 *
 532 */
 533static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
 534{
 535        struct netlbl_audit audit_info;
 536
 537        netlbl_netlink_auditinfo(skb, &audit_info);
 538
 539        return netlbl_domhsh_remove_default(&audit_info);
 540}
 541
 542/**
 543 * netlbl_mgmt_listdef - Handle a LISTDEF message
 544 * @skb: the NETLINK buffer
 545 * @info: the Generic NETLINK info block
 546 *
 547 * Description:
 548 * Process a user generated LISTDEF message and dumps the default domain
 549 * mapping in a form suitable for use in a kernel generated LISTDEF message.
 550 * Returns zero on success, negative values on failure.
 551 *
 552 */
 553static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
 554{
 555        int ret_val = -ENOMEM;
 556        struct sk_buff *ans_skb = NULL;
 557        void *data;
 558        struct netlbl_dom_map *entry;
 559
 560        ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 561        if (ans_skb == NULL)
 562                return -ENOMEM;
 563        data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 564                                 0, NLBL_MGMT_C_LISTDEF);
 565        if (data == NULL)
 566                goto listdef_failure;
 567
 568        rcu_read_lock();
 569        entry = netlbl_domhsh_getentry(NULL);
 570        if (entry == NULL) {
 571                ret_val = -ENOENT;
 572                goto listdef_failure_lock;
 573        }
 574        ret_val = netlbl_mgmt_listentry(ans_skb, entry);
 575        rcu_read_unlock();
 576        if (ret_val != 0)
 577                goto listdef_failure;
 578
 579        genlmsg_end(ans_skb, data);
 580        return genlmsg_reply(ans_skb, info);
 581
 582listdef_failure_lock:
 583        rcu_read_unlock();
 584listdef_failure:
 585        kfree_skb(ans_skb);
 586        return ret_val;
 587}
 588
 589/**
 590 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
 591 * @skb: the skb to write to
 592 * @cb: the NETLINK callback
 593 * @protocol: the NetLabel protocol to use in the message
 594 *
 595 * Description:
 596 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
 597 * answer a application's PROTOCOLS message.  Returns the size of the message
 598 * on success, negative values on failure.
 599 *
 600 */
 601static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
 602                                    struct netlink_callback *cb,
 603                                    u32 protocol)
 604{
 605        int ret_val = -ENOMEM;
 606        void *data;
 607
 608        data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 609                           &netlbl_mgmt_gnl_family, NLM_F_MULTI,
 610                           NLBL_MGMT_C_PROTOCOLS);
 611        if (data == NULL)
 612                goto protocols_cb_failure;
 613
 614        ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
 615        if (ret_val != 0)
 616                goto protocols_cb_failure;
 617
 618        genlmsg_end(skb, data);
 619        return 0;
 620
 621protocols_cb_failure:
 622        genlmsg_cancel(skb, data);
 623        return ret_val;
 624}
 625
 626/**
 627 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
 628 * @skb: the NETLINK buffer
 629 * @cb: the NETLINK callback
 630 *
 631 * Description:
 632 * Process a user generated PROTOCOLS message and respond accordingly.
 633 *
 634 */
 635static int netlbl_mgmt_protocols(struct sk_buff *skb,
 636                                 struct netlink_callback *cb)
 637{
 638        u32 protos_sent = cb->args[0];
 639
 640        if (protos_sent == 0) {
 641                if (netlbl_mgmt_protocols_cb(skb,
 642                                             cb,
 643                                             NETLBL_NLTYPE_UNLABELED) < 0)
 644                        goto protocols_return;
 645                protos_sent++;
 646        }
 647        if (protos_sent == 1) {
 648                if (netlbl_mgmt_protocols_cb(skb,
 649                                             cb,
 650                                             NETLBL_NLTYPE_CIPSOV4) < 0)
 651                        goto protocols_return;
 652                protos_sent++;
 653        }
 654
 655protocols_return:
 656        cb->args[0] = protos_sent;
 657        return skb->len;
 658}
 659
 660/**
 661 * netlbl_mgmt_version - Handle a VERSION message
 662 * @skb: the NETLINK buffer
 663 * @info: the Generic NETLINK info block
 664 *
 665 * Description:
 666 * Process a user generated VERSION message and respond accordingly.  Returns
 667 * zero on success, negative values on failure.
 668 *
 669 */
 670static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
 671{
 672        int ret_val = -ENOMEM;
 673        struct sk_buff *ans_skb = NULL;
 674        void *data;
 675
 676        ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 677        if (ans_skb == NULL)
 678                return -ENOMEM;
 679        data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 680                                 0, NLBL_MGMT_C_VERSION);
 681        if (data == NULL)
 682                goto version_failure;
 683
 684        ret_val = nla_put_u32(ans_skb,
 685                              NLBL_MGMT_A_VERSION,
 686                              NETLBL_PROTO_VERSION);
 687        if (ret_val != 0)
 688                goto version_failure;
 689
 690        genlmsg_end(ans_skb, data);
 691        return genlmsg_reply(ans_skb, info);
 692
 693version_failure:
 694        kfree_skb(ans_skb);
 695        return ret_val;
 696}
 697
 698
 699/*
 700 * NetLabel Generic NETLINK Command Definitions
 701 */
 702
 703static const struct genl_ops netlbl_mgmt_genl_ops[] = {
 704        {
 705        .cmd = NLBL_MGMT_C_ADD,
 706        .flags = GENL_ADMIN_PERM,
 707        .policy = netlbl_mgmt_genl_policy,
 708        .doit = netlbl_mgmt_add,
 709        .dumpit = NULL,
 710        },
 711        {
 712        .cmd = NLBL_MGMT_C_REMOVE,
 713        .flags = GENL_ADMIN_PERM,
 714        .policy = netlbl_mgmt_genl_policy,
 715        .doit = netlbl_mgmt_remove,
 716        .dumpit = NULL,
 717        },
 718        {
 719        .cmd = NLBL_MGMT_C_LISTALL,
 720        .flags = 0,
 721        .policy = netlbl_mgmt_genl_policy,
 722        .doit = NULL,
 723        .dumpit = netlbl_mgmt_listall,
 724        },
 725        {
 726        .cmd = NLBL_MGMT_C_ADDDEF,
 727        .flags = GENL_ADMIN_PERM,
 728        .policy = netlbl_mgmt_genl_policy,
 729        .doit = netlbl_mgmt_adddef,
 730        .dumpit = NULL,
 731        },
 732        {
 733        .cmd = NLBL_MGMT_C_REMOVEDEF,
 734        .flags = GENL_ADMIN_PERM,
 735        .policy = netlbl_mgmt_genl_policy,
 736        .doit = netlbl_mgmt_removedef,
 737        .dumpit = NULL,
 738        },
 739        {
 740        .cmd = NLBL_MGMT_C_LISTDEF,
 741        .flags = 0,
 742        .policy = netlbl_mgmt_genl_policy,
 743        .doit = netlbl_mgmt_listdef,
 744        .dumpit = NULL,
 745        },
 746        {
 747        .cmd = NLBL_MGMT_C_PROTOCOLS,
 748        .flags = 0,
 749        .policy = netlbl_mgmt_genl_policy,
 750        .doit = NULL,
 751        .dumpit = netlbl_mgmt_protocols,
 752        },
 753        {
 754        .cmd = NLBL_MGMT_C_VERSION,
 755        .flags = 0,
 756        .policy = netlbl_mgmt_genl_policy,
 757        .doit = netlbl_mgmt_version,
 758        .dumpit = NULL,
 759        },
 760};
 761
 762/*
 763 * NetLabel Generic NETLINK Protocol Functions
 764 */
 765
 766/**
 767 * netlbl_mgmt_genl_init - Register the NetLabel management component
 768 *
 769 * Description:
 770 * Register the NetLabel management component with the Generic NETLINK
 771 * mechanism.  Returns zero on success, negative values on failure.
 772 *
 773 */
 774int __init netlbl_mgmt_genl_init(void)
 775{
 776        return genl_register_family_with_ops(&netlbl_mgmt_gnl_family,
 777                                             netlbl_mgmt_genl_ops);
 778}
 779