net/netlabel/netlabel_mgmt.c

   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.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 <net/sock.h>
  36 #include <net/netlink.h>
  37 #include <net/genetlink.h>
  38 #include <net/netlabel.h>
  39 #include <net/cipso_ipv4.h>
  40
  41 #include "netlabel_domainhash.h"
  42 #include "netlabel_user.h"
  43 #include "netlabel_mgmt.h"
  44
  45 /* Argument struct for netlbl_domhsh_walk() */
  46 struct netlbl_domhsh_walk_arg {
  47         struct netlink_callback *nl_cb;
  48         struct sk_buff *skb;
  49         u32 seq;
  50 };
  51
  52 /* NetLabel Generic NETLINK CIPSOv4 family */
  53 static struct genl_family netlbl_mgmt_gnl_family = {
  54         .id = GENL_ID_GENERATE,
  55         .hdrsize = 0,
  56         .name = NETLBL_NLTYPE_MGMT_NAME,
  57         .version = NETLBL_PROTO_VERSION,
  58         .maxattr = NLBL_MGMT_A_MAX,
  59 };
  60
  61 /* NetLabel Netlink attribute policy */
  62 static struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
  63         [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
  64         [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
  65         [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
  66         [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
  67 };
  68
  69 /*
  70  * NetLabel Command Handlers
  71  */
  72
  73 /**
  74  * netlbl_mgmt_add - Handle an ADD message
  75  * @skb: the NETLINK buffer
  76  * @info: the Generic NETLINK info block
  77  *
  78  * Description:
  79  * Process a user generated ADD message and add the domains from the message
  80  * to the hash table.  See netlabel.h for a description of the message format.
  81  * Returns zero on success, negative values on failure.
  82  *
  83  */
  84 static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
  85 {
  86         int ret_val = -EINVAL;
  87         struct netlbl_dom_map *entry = NULL;
  88         size_t tmp_size;
  89         u32 tmp_val;
  90         struct netlbl_audit audit_info;
  91
  92         if (!info->attrs[NLBL_MGMT_A_DOMAIN] ||
  93             !info->attrs[NLBL_MGMT_A_PROTOCOL])
  94                 goto add_failure;
  95
  96         netlbl_netlink_auditinfo(skb, &audit_info);
  97
  98         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
  99         if (entry == NULL) {
 100                 ret_val = -ENOMEM;
 101                 goto add_failure;
 102         }
 103         tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
 104         entry->domain = kmalloc(tmp_size, GFP_KERNEL);
 105         if (entry->domain == NULL) {
 106                 ret_val = -ENOMEM;
 107                 goto add_failure;
 108         }
 109         entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
 110         nla_strlcpy(entry->domain, info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
 111
 112         switch (entry->type) {
 113         case NETLBL_NLTYPE_UNLABELED:
 114                 ret_val = netlbl_domhsh_add(entry, &audit_info);
 115                 break;
 116         case NETLBL_NLTYPE_CIPSOV4:
 117                 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
 118                         goto add_failure;
 119
 120                 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
 121                 /* We should be holding a rcu_read_lock() here while we hold
 122                  * the result but since the entry will always be deleted when
 123                  * the CIPSO DOI is deleted we aren't going to keep the
 124                  * lock. */
 125                 rcu_read_lock();
 126                 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
 127                 if (entry->type_def.cipsov4 == NULL) {
 128                         rcu_read_unlock();
 129                         goto add_failure;
 130                 }
 131                 ret_val = netlbl_domhsh_add(entry, &audit_info);
 132                 rcu_read_unlock();
 133                 break;
 134         default:
 135                 goto add_failure;
 136         }
 137         if (ret_val != 0)
 138                 goto add_failure;
 139
 140         return 0;
 141
 142 add_failure:
 143         if (entry)
 144                 kfree(entry->domain);
 145         kfree(entry);
 146         return ret_val;
 147 }
 148
 149 /**
 150  * netlbl_mgmt_remove - Handle a REMOVE message
 151  * @skb: the NETLINK buffer
 152  * @info: the Generic NETLINK info block
 153  *
 154  * Description:
 155  * Process a user generated REMOVE message and remove the specified domain
 156  * mappings.  Returns zero on success, negative values on failure.
 157  *
 158  */
 159 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
 160 {
 161         char *domain;
 162         struct netlbl_audit audit_info;
 163
 164         if (!info->attrs[NLBL_MGMT_A_DOMAIN])
 165                 return -EINVAL;
 166
 167         netlbl_netlink_auditinfo(skb, &audit_info);
 168
 169         domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
 170         return netlbl_domhsh_remove(domain, &audit_info);
 171 }
 172
 173 /**
 174  * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
 175  * @entry: the domain mapping hash table entry
 176  * @arg: the netlbl_domhsh_walk_arg structure
 177  *
 178  * Description:
 179  * This function is designed to be used as a callback to the
 180  * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
 181  * message.  Returns the size of the message on success, negative values on
 182  * failure.
 183  *
 184  */
 185 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
 186 {
 187         int ret_val = -ENOMEM;
 188         struct netlbl_domhsh_walk_arg *cb_arg = arg;
 189         void *data;
 190
 191         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
 192                            cb_arg->seq, &netlbl_mgmt_gnl_family,
 193                            NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
 194         if (data == NULL)
 195                 goto listall_cb_failure;
 196
 197         ret_val = nla_put_string(cb_arg->skb,
 198                                  NLBL_MGMT_A_DOMAIN,
 199                                  entry->domain);
 200         if (ret_val != 0)
 201                 goto listall_cb_failure;
 202         ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
 203         if (ret_val != 0)
 204                 goto listall_cb_failure;
 205         switch (entry->type) {
 206         case NETLBL_NLTYPE_CIPSOV4:
 207                 ret_val = nla_put_u32(cb_arg->skb,
 208                                       NLBL_MGMT_A_CV4DOI,
 209                                       entry->type_def.cipsov4->doi);
 210                 if (ret_val != 0)
 211                         goto listall_cb_failure;
 212                 break;
 213         }
 214
 215         cb_arg->seq++;
 216         return genlmsg_end(cb_arg->skb, data);
 217
 218 listall_cb_failure:
 219         genlmsg_cancel(cb_arg->skb, data);
 220         return ret_val;
 221 }
 222
 223 /**
 224  * netlbl_mgmt_listall - Handle a LISTALL message
 225  * @skb: the NETLINK buffer
 226  * @cb: the NETLINK callback
 227  *
 228  * Description:
 229  * Process a user generated LISTALL message and dumps the domain hash table in
 230  * a form suitable for use in a kernel generated LISTALL message.  Returns zero
 231  * on success, negative values on failure.
 232  *
 233  */
 234 static int netlbl_mgmt_listall(struct sk_buff *skb,
 235                                struct netlink_callback *cb)
 236 {
 237         struct netlbl_domhsh_walk_arg cb_arg;
 238         u32 skip_bkt = cb->args[0];
 239         u32 skip_chain = cb->args[1];
 240
 241         cb_arg.nl_cb = cb;
 242         cb_arg.skb = skb;
 243         cb_arg.seq = cb->nlh->nlmsg_seq;
 244
 245         netlbl_domhsh_walk(&skip_bkt,
 246                            &skip_chain,
 247                            netlbl_mgmt_listall_cb,
 248                            &cb_arg);
 249
 250         cb->args[0] = skip_bkt;
 251         cb->args[1] = skip_chain;
 252         return skb->len;
 253 }
 254
 255 /**
 256  * netlbl_mgmt_adddef - Handle an ADDDEF message
 257  * @skb: the NETLINK buffer
 258  * @info: the Generic NETLINK info block
 259  *
 260  * Description:
 261  * Process a user generated ADDDEF message and respond accordingly.  Returns
 262  * zero on success, negative values on failure.
 263  *
 264  */
 265 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
 266 {
 267         int ret_val = -EINVAL;
 268         struct netlbl_dom_map *entry = NULL;
 269         u32 tmp_val;
 270         struct netlbl_audit audit_info;
 271
 272         if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
 273                 goto adddef_failure;
 274
 275         netlbl_netlink_auditinfo(skb, &audit_info);
 276
 277         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 278         if (entry == NULL) {
 279                 ret_val = -ENOMEM;
 280                 goto adddef_failure;
 281         }
 282         entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
 283
 284         switch (entry->type) {
 285         case NETLBL_NLTYPE_UNLABELED:
 286                 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
 287                 break;
 288         case NETLBL_NLTYPE_CIPSOV4:
 289                 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
 290                         goto adddef_failure;
 291
 292                 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
 293                 /* We should be holding a rcu_read_lock() here while we hold
 294                  * the result but since the entry will always be deleted when
 295                  * the CIPSO DOI is deleted we aren't going to keep the
 296                  * lock. */
 297                 rcu_read_lock();
 298                 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
 299                 if (entry->type_def.cipsov4 == NULL) {
 300                         rcu_read_unlock();
 301                         goto adddef_failure;
 302                 }
 303                 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
 304                 rcu_read_unlock();
 305                 break;
 306         default:
 307                 goto adddef_failure;
 308         }
 309         if (ret_val != 0)
 310                 goto adddef_failure;
 311
 312         return 0;
 313
 314 adddef_failure:
 315         kfree(entry);
 316         return ret_val;
 317 }
 318
 319 /**
 320  * netlbl_mgmt_removedef - Handle a REMOVEDEF message
 321  * @skb: the NETLINK buffer
 322  * @info: the Generic NETLINK info block
 323  *
 324  * Description:
 325  * Process a user generated REMOVEDEF message and remove the default domain
 326  * mapping.  Returns zero on success, negative values on failure.
 327  *
 328  */
 329 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
 330 {
 331         struct netlbl_audit audit_info;
 332
 333         netlbl_netlink_auditinfo(skb, &audit_info);
 334
 335         return netlbl_domhsh_remove_default(&audit_info);
 336 }
 337
 338 /**
 339  * netlbl_mgmt_listdef - Handle a LISTDEF message
 340  * @skb: the NETLINK buffer
 341  * @info: the Generic NETLINK info block
 342  *
 343  * Description:
 344  * Process a user generated LISTDEF message and dumps the default domain
 345  * mapping in a form suitable for use in a kernel generated LISTDEF message.
 346  * Returns zero on success, negative values on failure.
 347  *
 348  */
 349 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
 350 {
 351         int ret_val = -ENOMEM;
 352         struct sk_buff *ans_skb = NULL;
 353         void *data;
 354         struct netlbl_dom_map *entry;
 355
 356         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 357         if (ans_skb == NULL)
 358                 return -ENOMEM;
 359         data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 360                                  0, NLBL_MGMT_C_LISTDEF);
 361         if (data == NULL)
 362                 goto listdef_failure;
 363
 364         rcu_read_lock();
 365         entry = netlbl_domhsh_getentry(NULL);
 366         if (entry == NULL) {
 367                 ret_val = -ENOENT;
 368                 goto listdef_failure_lock;
 369         }
 370         ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
 371         if (ret_val != 0)
 372                 goto listdef_failure_lock;
 373         switch (entry->type) {
 374         case NETLBL_NLTYPE_CIPSOV4:
 375                 ret_val = nla_put_u32(ans_skb,
 376                                       NLBL_MGMT_A_CV4DOI,
 377                                       entry->type_def.cipsov4->doi);
 378                 if (ret_val != 0)
 379                         goto listdef_failure_lock;
 380                 break;
 381         }
 382         rcu_read_unlock();
 383
 384         genlmsg_end(ans_skb, data);
 385
 386         ret_val = genlmsg_reply(ans_skb, info);
 387         if (ret_val != 0)
 388                 goto listdef_failure;
 389         return 0;
 390
 391 listdef_failure_lock:
 392         rcu_read_unlock();
 393 listdef_failure:
 394         kfree_skb(ans_skb);
 395         return ret_val;
 396 }
 397
 398 /**
 399  * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
 400  * @skb: the skb to write to
 401  * @seq: the NETLINK sequence number
 402  * @cb: the NETLINK callback
 403  * @protocol: the NetLabel protocol to use in the message
 404  *
 405  * Description:
 406  * This function is to be used in conjunction with netlbl_mgmt_protocols() to
 407  * answer a application's PROTOCOLS message.  Returns the size of the message
 408  * on success, negative values on failure.
 409  *
 410  */
 411 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
 412                                     struct netlink_callback *cb,
 413                                     u32 protocol)
 414 {
 415         int ret_val = -ENOMEM;
 416         void *data;
 417
 418         data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
 419                            &netlbl_mgmt_gnl_family, NLM_F_MULTI,
 420                            NLBL_MGMT_C_PROTOCOLS);
 421         if (data == NULL)
 422                 goto protocols_cb_failure;
 423
 424         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
 425         if (ret_val != 0)
 426                 goto protocols_cb_failure;
 427
 428         return genlmsg_end(skb, data);
 429
 430 protocols_cb_failure:
 431         genlmsg_cancel(skb, data);
 432         return ret_val;
 433 }
 434
 435 /**
 436  * netlbl_mgmt_protocols - Handle a PROTOCOLS message
 437  * @skb: the NETLINK buffer
 438  * @cb: the NETLINK callback
 439  *
 440  * Description:
 441  * Process a user generated PROTOCOLS message and respond accordingly.
 442  *
 443  */
 444 static int netlbl_mgmt_protocols(struct sk_buff *skb,
 445                                  struct netlink_callback *cb)
 446 {
 447         u32 protos_sent = cb->args[0];
 448
 449         if (protos_sent == 0) {
 450                 if (netlbl_mgmt_protocols_cb(skb,
 451                                              cb,
 452                                              NETLBL_NLTYPE_UNLABELED) < 0)
 453                         goto protocols_return;
 454                 protos_sent++;
 455         }
 456         if (protos_sent == 1) {
 457                 if (netlbl_mgmt_protocols_cb(skb,
 458                                              cb,
 459                                              NETLBL_NLTYPE_CIPSOV4) < 0)
 460                         goto protocols_return;
 461                 protos_sent++;
 462         }
 463
 464 protocols_return:
 465         cb->args[0] = protos_sent;
 466         return skb->len;
 467 }
 468
 469 /**
 470  * netlbl_mgmt_version - Handle a VERSION message
 471  * @skb: the NETLINK buffer
 472  * @info: the Generic NETLINK info block
 473  *
 474  * Description:
 475  * Process a user generated VERSION message and respond accordingly.  Returns
 476  * zero on success, negative values on failure.
 477  *
 478  */
 479 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
 480 {
 481         int ret_val = -ENOMEM;
 482         struct sk_buff *ans_skb = NULL;
 483         void *data;
 484
 485         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 486         if (ans_skb == NULL)
 487                 return -ENOMEM;
 488         data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 489                                  0, NLBL_MGMT_C_VERSION);
 490         if (data == NULL)
 491                 goto version_failure;
 492
 493         ret_val = nla_put_u32(ans_skb,
 494                               NLBL_MGMT_A_VERSION,
 495                               NETLBL_PROTO_VERSION);
 496         if (ret_val != 0)
 497                 goto version_failure;
 498
 499         genlmsg_end(ans_skb, data);
 500
 501         ret_val = genlmsg_reply(ans_skb, info);
 502         if (ret_val != 0)
 503                 goto version_failure;
 504         return 0;
 505
 506 version_failure:
 507         kfree_skb(ans_skb);
 508         return ret_val;
 509 }
 510
 511
 512 /*
 513  * NetLabel Generic NETLINK Command Definitions
 514  */
 515
 516 static struct genl_ops netlbl_mgmt_genl_c_add = {
 517         .cmd = NLBL_MGMT_C_ADD,
 518         .flags = GENL_ADMIN_PERM,
 519         .policy = netlbl_mgmt_genl_policy,
 520         .doit = netlbl_mgmt_add,
 521         .dumpit = NULL,
 522 };
 523
 524 static struct genl_ops netlbl_mgmt_genl_c_remove = {
 525         .cmd = NLBL_MGMT_C_REMOVE,
 526         .flags = GENL_ADMIN_PERM,
 527         .policy = netlbl_mgmt_genl_policy,
 528         .doit = netlbl_mgmt_remove,
 529         .dumpit = NULL,
 530 };
 531
 532 static struct genl_ops netlbl_mgmt_genl_c_listall = {
 533         .cmd = NLBL_MGMT_C_LISTALL,
 534         .flags = 0,
 535         .policy = netlbl_mgmt_genl_policy,
 536         .doit = NULL,
 537         .dumpit = netlbl_mgmt_listall,
 538 };
 539
 540 static struct genl_ops netlbl_mgmt_genl_c_adddef = {
 541         .cmd = NLBL_MGMT_C_ADDDEF,
 542         .flags = GENL_ADMIN_PERM,
 543         .policy = netlbl_mgmt_genl_policy,
 544         .doit = netlbl_mgmt_adddef,
 545         .dumpit = NULL,
 546 };
 547
 548 static struct genl_ops netlbl_mgmt_genl_c_removedef = {
 549         .cmd = NLBL_MGMT_C_REMOVEDEF,
 550         .flags = GENL_ADMIN_PERM,
 551         .policy = netlbl_mgmt_genl_policy,
 552         .doit = netlbl_mgmt_removedef,
 553         .dumpit = NULL,
 554 };
 555
 556 static struct genl_ops netlbl_mgmt_genl_c_listdef = {
 557         .cmd = NLBL_MGMT_C_LISTDEF,
 558         .flags = 0,
 559         .policy = netlbl_mgmt_genl_policy,
 560         .doit = netlbl_mgmt_listdef,
 561         .dumpit = NULL,
 562 };
 563
 564 static struct genl_ops netlbl_mgmt_genl_c_protocols = {
 565         .cmd = NLBL_MGMT_C_PROTOCOLS,
 566         .flags = 0,
 567         .policy = netlbl_mgmt_genl_policy,
 568         .doit = NULL,
 569         .dumpit = netlbl_mgmt_protocols,
 570 };
 571
 572 static struct genl_ops netlbl_mgmt_genl_c_version = {
 573         .cmd = NLBL_MGMT_C_VERSION,
 574         .flags = 0,
 575         .policy = netlbl_mgmt_genl_policy,
 576         .doit = netlbl_mgmt_version,
 577         .dumpit = NULL,
 578 };
 579
 580 /*
 581  * NetLabel Generic NETLINK Protocol Functions
 582  */
 583
 584 /**
 585  * netlbl_mgmt_genl_init - Register the NetLabel management component
 586  *
 587  * Description:
 588  * Register the NetLabel management component with the Generic NETLINK
 589  * mechanism.  Returns zero on success, negative values on failure.
 590  *
 591  */
 592 int netlbl_mgmt_genl_init(void)
 593 {
 594         int ret_val;
 595
 596         ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
 597         if (ret_val != 0)
 598                 return ret_val;
 599
 600         ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
 601                                     &netlbl_mgmt_genl_c_add);
 602         if (ret_val != 0)
 603                 return ret_val;
 604         ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
 605                                     &netlbl_mgmt_genl_c_remove);
 606         if (ret_val != 0)
 607                 return ret_val;
 608         ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
 609                                     &netlbl_mgmt_genl_c_listall);
 610         if (ret_val != 0)
 611                 return ret_val;
 612         ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
 613                                     &netlbl_mgmt_genl_c_adddef);
 614         if (ret_val != 0)
 615                 return ret_val;
 616         ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
 617                                     &netlbl_mgmt_genl_c_removedef);
 618         if (ret_val != 0)
 619                 return ret_val;
 620         ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
 621                                     &netlbl_mgmt_genl_c_listdef);
 622         if (ret_val != 0)
 623                 return ret_val;
 624         ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
 625                                     &netlbl_mgmt_genl_c_protocols);
 626         if (ret_val != 0)
 627                 return ret_val;
 628         ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
 629                                     &netlbl_mgmt_genl_c_version);
 630         if (ret_val != 0)
 631                 return ret_val;
 632
 633         return 0;
 634 }