net/netlabel/netlabel_mgmt.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * NetLabel Management Support
   4  *
   5  * This file defines the management functions for the NetLabel system.  The
   6  * NetLabel system manages static and dynamic label mappings for network
   7  * protocols such as CIPSO and RIPSO.
   8  *
   9  * Author: Paul Moore <paul@paul-moore.com>
  10  */
  11
  12 /*
  13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
  14  */
  15
  16 #include <linux/types.h>
  17 #include <linux/socket.h>
  18 #include <linux/string.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/in.h>
  21 #include <linux/in6.h>
  22 #include <linux/slab.h>
  23 #include <net/sock.h>
  24 #include <net/netlink.h>
  25 #include <net/genetlink.h>
  26 #include <net/ip.h>
  27 #include <net/ipv6.h>
  28 #include <net/netlabel.h>
  29 #include <net/cipso_ipv4.h>
  30 #include <net/calipso.h>
  31 #include <linux/atomic.h>
  32
  33 #include "netlabel_calipso.h"
  34 #include "netlabel_domainhash.h"
  35 #include "netlabel_user.h"
  36 #include "netlabel_mgmt.h"
  37
  38 /* NetLabel configured protocol counter */
  39 atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
  40
  41 /* Argument struct for netlbl_domhsh_walk() */
  42 struct netlbl_domhsh_walk_arg {
  43         struct netlink_callback *nl_cb;
  44         struct sk_buff *skb;
  45         u32 seq;
  46 };
  47
  48 /* NetLabel Generic NETLINK CIPSOv4 family */
  49 static struct genl_family netlbl_mgmt_gnl_family;
  50
  51 /* NetLabel Netlink attribute policy */
  52 static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
  53         [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
  54         [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
  55         [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
  56         [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
  57         [NLBL_MGMT_A_FAMILY] = { .type = NLA_U16 },
  58         [NLBL_MGMT_A_CLPDOI] = { .type = NLA_U32 },
  59 };
  60
  61 /*
  62  * Helper Functions
  63  */
  64
  65 /**
  66  * netlbl_mgmt_add_common - Handle an ADD message
  67  * @info: the Generic NETLINK info block
  68  * @audit_info: NetLabel audit information
  69  *
  70  * Description:
  71  * Helper function for the ADD and ADDDEF messages to add the domain mappings
  72  * from the message to the hash table.  See netlabel.h for a description of the
  73  * message format.  Returns zero on success, negative values on failure.
  74  *
  75  */
  76 static int netlbl_mgmt_add_common(struct genl_info *info,
  77                                   struct netlbl_audit *audit_info)
  78 {
  79         void *pmap = NULL;
  80         int ret_val = -EINVAL;
  81         struct netlbl_domaddr_map *addrmap = NULL;
  82         struct cipso_v4_doi *cipsov4 = NULL;
  83 #if IS_ENABLED(CONFIG_IPV6)
  84         struct calipso_doi *calipso = NULL;
  85 #endif
  86         u32 tmp_val;
  87         struct netlbl_dom_map *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
  88
  89         if (!entry)
  90                 return -ENOMEM;
  91         entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
  92         if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
  93                 size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
  94                 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
  95                 if (entry->domain == NULL) {
  96                         ret_val = -ENOMEM;
  97                         goto add_free_entry;
  98                 }
  99                 nla_strscpy(entry->domain,
 100                             info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
 101         }
 102
 103         /* NOTE: internally we allow/use a entry->def.type value of
 104          *       NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
 105          *       to pass that as a protocol value because we need to know the
 106          *       "real" protocol */
 107
 108         switch (entry->def.type) {
 109         case NETLBL_NLTYPE_UNLABELED:
 110                 if (info->attrs[NLBL_MGMT_A_FAMILY])
 111                         entry->family =
 112                                 nla_get_u16(info->attrs[NLBL_MGMT_A_FAMILY]);
 113                 else
 114                         entry->family = AF_UNSPEC;
 115                 break;
 116         case NETLBL_NLTYPE_CIPSOV4:
 117                 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
 118                         goto add_free_domain;
 119
 120                 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
 121                 cipsov4 = cipso_v4_doi_getdef(tmp_val);
 122                 if (cipsov4 == NULL)
 123                         goto add_free_domain;
 124                 entry->family = AF_INET;
 125                 entry->def.cipso = cipsov4;
 126                 break;
 127 #if IS_ENABLED(CONFIG_IPV6)
 128         case NETLBL_NLTYPE_CALIPSO:
 129                 if (!info->attrs[NLBL_MGMT_A_CLPDOI])
 130                         goto add_free_domain;
 131
 132                 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CLPDOI]);
 133                 calipso = calipso_doi_getdef(tmp_val);
 134                 if (calipso == NULL)
 135                         goto add_free_domain;
 136                 entry->family = AF_INET6;
 137                 entry->def.calipso = calipso;
 138                 break;
 139 #endif /* IPv6 */
 140         default:
 141                 goto add_free_domain;
 142         }
 143
 144         if ((entry->family == AF_INET && info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 145             (entry->family == AF_INET6 && info->attrs[NLBL_MGMT_A_IPV4ADDR]))
 146                 goto add_doi_put_def;
 147
 148         if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
 149                 struct in_addr *addr;
 150                 struct in_addr *mask;
 151                 struct netlbl_domaddr4_map *map;
 152
 153                 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
 154                 if (addrmap == NULL) {
 155                         ret_val = -ENOMEM;
 156                         goto add_doi_put_def;
 157                 }
 158                 INIT_LIST_HEAD(&addrmap->list4);
 159                 INIT_LIST_HEAD(&addrmap->list6);
 160
 161                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
 162                     sizeof(struct in_addr)) {
 163                         ret_val = -EINVAL;
 164                         goto add_free_addrmap;
 165                 }
 166                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
 167                     sizeof(struct in_addr)) {
 168                         ret_val = -EINVAL;
 169                         goto add_free_addrmap;
 170                 }
 171                 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
 172                 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
 173
 174                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 175                 if (map == NULL) {
 176                         ret_val = -ENOMEM;
 177                         goto add_free_addrmap;
 178                 }
 179                 pmap = map;
 180                 map->list.addr = addr->s_addr & mask->s_addr;
 181                 map->list.mask = mask->s_addr;
 182                 map->list.valid = 1;
 183                 map->def.type = entry->def.type;
 184                 if (cipsov4)
 185                         map->def.cipso = cipsov4;
 186
 187                 ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
 188                 if (ret_val != 0)
 189                         goto add_free_map;
 190
 191                 entry->family = AF_INET;
 192                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 193                 entry->def.addrsel = addrmap;
 194 #if IS_ENABLED(CONFIG_IPV6)
 195         } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
 196                 struct in6_addr *addr;
 197                 struct in6_addr *mask;
 198                 struct netlbl_domaddr6_map *map;
 199
 200                 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
 201                 if (addrmap == NULL) {
 202                         ret_val = -ENOMEM;
 203                         goto add_doi_put_def;
 204                 }
 205                 INIT_LIST_HEAD(&addrmap->list4);
 206                 INIT_LIST_HEAD(&addrmap->list6);
 207
 208                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
 209                     sizeof(struct in6_addr)) {
 210                         ret_val = -EINVAL;
 211                         goto add_free_addrmap;
 212                 }
 213                 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
 214                     sizeof(struct in6_addr)) {
 215                         ret_val = -EINVAL;
 216                         goto add_free_addrmap;
 217                 }
 218                 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
 219                 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
 220
 221                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 222                 if (map == NULL) {
 223                         ret_val = -ENOMEM;
 224                         goto add_free_addrmap;
 225                 }
 226                 pmap = map;
 227                 map->list.addr = *addr;
 228                 map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
 229                 map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
 230                 map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
 231                 map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
 232                 map->list.mask = *mask;
 233                 map->list.valid = 1;
 234                 map->def.type = entry->def.type;
 235                 if (calipso)
 236                         map->def.calipso = calipso;
 237
 238                 ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
 239                 if (ret_val != 0)
 240                         goto add_free_map;
 241
 242                 entry->family = AF_INET6;
 243                 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 244                 entry->def.addrsel = addrmap;
 245 #endif /* IPv6 */
 246         }
 247
 248         ret_val = netlbl_domhsh_add(entry, audit_info);
 249         if (ret_val != 0)
 250                 goto add_free_map;
 251
 252         return 0;
 253
 254 add_free_map:
 255         kfree(pmap);
 256 add_free_addrmap:
 257         kfree(addrmap);
 258 add_doi_put_def:
 259         cipso_v4_doi_putdef(cipsov4);
 260 #if IS_ENABLED(CONFIG_IPV6)
 261         calipso_doi_putdef(calipso);
 262 #endif
 263 add_free_domain:
 264         kfree(entry->domain);
 265 add_free_entry:
 266         kfree(entry);
 267         return ret_val;
 268 }
 269
 270 /**
 271  * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
 272  * @skb: the NETLINK buffer
 273  * @entry: the map entry
 274  *
 275  * Description:
 276  * This function is a helper function used by the LISTALL and LISTDEF command
 277  * handlers.  The caller is responsible for ensuring that the RCU read lock
 278  * is held.  Returns zero on success, negative values on failure.
 279  *
 280  */
 281 static int netlbl_mgmt_listentry(struct sk_buff *skb,
 282                                  struct netlbl_dom_map *entry)
 283 {
 284         int ret_val = 0;
 285         struct nlattr *nla_a;
 286         struct nlattr *nla_b;
 287         struct netlbl_af4list *iter4;
 288 #if IS_ENABLED(CONFIG_IPV6)
 289         struct netlbl_af6list *iter6;
 290 #endif
 291
 292         if (entry->domain != NULL) {
 293                 ret_val = nla_put_string(skb,
 294                                          NLBL_MGMT_A_DOMAIN, entry->domain);
 295                 if (ret_val != 0)
 296                         return ret_val;
 297         }
 298
 299         ret_val = nla_put_u16(skb, NLBL_MGMT_A_FAMILY, entry->family);
 300         if (ret_val != 0)
 301                 return ret_val;
 302
 303         switch (entry->def.type) {
 304         case NETLBL_NLTYPE_ADDRSELECT:
 305                 nla_a = nla_nest_start_noflag(skb, NLBL_MGMT_A_SELECTORLIST);
 306                 if (nla_a == NULL)
 307                         return -ENOMEM;
 308
 309                 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
 310                         struct netlbl_domaddr4_map *map4;
 311                         struct in_addr addr_struct;
 312
 313                         nla_b = nla_nest_start_noflag(skb,
 314                                                       NLBL_MGMT_A_ADDRSELECTOR);
 315                         if (nla_b == NULL)
 316                                 return -ENOMEM;
 317
 318                         addr_struct.s_addr = iter4->addr;
 319                         ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4ADDR,
 320                                                   addr_struct.s_addr);
 321                         if (ret_val != 0)
 322                                 return ret_val;
 323                         addr_struct.s_addr = iter4->mask;
 324                         ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4MASK,
 325                                                   addr_struct.s_addr);
 326                         if (ret_val != 0)
 327                                 return ret_val;
 328                         map4 = netlbl_domhsh_addr4_entry(iter4);
 329                         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 330                                               map4->def.type);
 331                         if (ret_val != 0)
 332                                 return ret_val;
 333                         switch (map4->def.type) {
 334                         case NETLBL_NLTYPE_CIPSOV4:
 335                                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
 336                                                       map4->def.cipso->doi);
 337                                 if (ret_val != 0)
 338                                         return ret_val;
 339                                 break;
 340                         }
 341
 342                         nla_nest_end(skb, nla_b);
 343                 }
 344 #if IS_ENABLED(CONFIG_IPV6)
 345                 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
 346                         struct netlbl_domaddr6_map *map6;
 347
 348                         nla_b = nla_nest_start_noflag(skb,
 349                                                       NLBL_MGMT_A_ADDRSELECTOR);
 350                         if (nla_b == NULL)
 351                                 return -ENOMEM;
 352
 353                         ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6ADDR,
 354                                                    &iter6->addr);
 355                         if (ret_val != 0)
 356                                 return ret_val;
 357                         ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6MASK,
 358                                                    &iter6->mask);
 359                         if (ret_val != 0)
 360                                 return ret_val;
 361                         map6 = netlbl_domhsh_addr6_entry(iter6);
 362                         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 363                                               map6->def.type);
 364                         if (ret_val != 0)
 365                                 return ret_val;
 366
 367                         switch (map6->def.type) {
 368                         case NETLBL_NLTYPE_CALIPSO:
 369                                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
 370                                                       map6->def.calipso->doi);
 371                                 if (ret_val != 0)
 372                                         return ret_val;
 373                                 break;
 374                         }
 375
 376                         nla_nest_end(skb, nla_b);
 377                 }
 378 #endif /* IPv6 */
 379
 380                 nla_nest_end(skb, nla_a);
 381                 break;
 382         case NETLBL_NLTYPE_UNLABELED:
 383                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 384                                       entry->def.type);
 385                 break;
 386         case NETLBL_NLTYPE_CIPSOV4:
 387                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 388                                       entry->def.type);
 389                 if (ret_val != 0)
 390                         return ret_val;
 391                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
 392                                       entry->def.cipso->doi);
 393                 break;
 394         case NETLBL_NLTYPE_CALIPSO:
 395                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
 396                                       entry->def.type);
 397                 if (ret_val != 0)
 398                         return ret_val;
 399                 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
 400                                       entry->def.calipso->doi);
 401                 break;
 402         }
 403
 404         return ret_val;
 405 }
 406
 407 /*
 408  * NetLabel Command Handlers
 409  */
 410
 411 /**
 412  * netlbl_mgmt_add - Handle an ADD message
 413  * @skb: the NETLINK buffer
 414  * @info: the Generic NETLINK info block
 415  *
 416  * Description:
 417  * Process a user generated ADD message and add the domains from the message
 418  * to the hash table.  See netlabel.h for a description of the message format.
 419  * Returns zero on success, negative values on failure.
 420  *
 421  */
 422 static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
 423 {
 424         struct netlbl_audit audit_info;
 425
 426         if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
 427             (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
 428             (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
 429              info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 430             (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
 431              info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
 432             ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
 433              (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
 434             ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
 435              (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
 436                 return -EINVAL;
 437
 438         netlbl_netlink_auditinfo(&audit_info);
 439
 440         return netlbl_mgmt_add_common(info, &audit_info);
 441 }
 442
 443 /**
 444  * netlbl_mgmt_remove - Handle a REMOVE message
 445  * @skb: the NETLINK buffer
 446  * @info: the Generic NETLINK info block
 447  *
 448  * Description:
 449  * Process a user generated REMOVE message and remove the specified domain
 450  * mappings.  Returns zero on success, negative values on failure.
 451  *
 452  */
 453 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
 454 {
 455         char *domain;
 456         struct netlbl_audit audit_info;
 457
 458         if (!info->attrs[NLBL_MGMT_A_DOMAIN])
 459                 return -EINVAL;
 460
 461         netlbl_netlink_auditinfo(&audit_info);
 462
 463         domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
 464         return netlbl_domhsh_remove(domain, AF_UNSPEC, &audit_info);
 465 }
 466
 467 /**
 468  * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
 469  * @entry: the domain mapping hash table entry
 470  * @arg: the netlbl_domhsh_walk_arg structure
 471  *
 472  * Description:
 473  * This function is designed to be used as a callback to the
 474  * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
 475  * message.  Returns the size of the message on success, negative values on
 476  * failure.
 477  *
 478  */
 479 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
 480 {
 481         int ret_val = -ENOMEM;
 482         struct netlbl_domhsh_walk_arg *cb_arg = arg;
 483         void *data;
 484
 485         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
 486                            cb_arg->seq, &netlbl_mgmt_gnl_family,
 487                            NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
 488         if (data == NULL)
 489                 goto listall_cb_failure;
 490
 491         ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
 492         if (ret_val != 0)
 493                 goto listall_cb_failure;
 494
 495         cb_arg->seq++;
 496         genlmsg_end(cb_arg->skb, data);
 497         return 0;
 498
 499 listall_cb_failure:
 500         genlmsg_cancel(cb_arg->skb, data);
 501         return ret_val;
 502 }
 503
 504 /**
 505  * netlbl_mgmt_listall - Handle a LISTALL message
 506  * @skb: the NETLINK buffer
 507  * @cb: the NETLINK callback
 508  *
 509  * Description:
 510  * Process a user generated LISTALL message and dumps the domain hash table in
 511  * a form suitable for use in a kernel generated LISTALL message.  Returns zero
 512  * on success, negative values on failure.
 513  *
 514  */
 515 static int netlbl_mgmt_listall(struct sk_buff *skb,
 516                                struct netlink_callback *cb)
 517 {
 518         struct netlbl_domhsh_walk_arg cb_arg;
 519         u32 skip_bkt = cb->args[0];
 520         u32 skip_chain = cb->args[1];
 521
 522         cb_arg.nl_cb = cb;
 523         cb_arg.skb = skb;
 524         cb_arg.seq = cb->nlh->nlmsg_seq;
 525
 526         netlbl_domhsh_walk(&skip_bkt,
 527                            &skip_chain,
 528                            netlbl_mgmt_listall_cb,
 529                            &cb_arg);
 530
 531         cb->args[0] = skip_bkt;
 532         cb->args[1] = skip_chain;
 533         return skb->len;
 534 }
 535
 536 /**
 537  * netlbl_mgmt_adddef - Handle an ADDDEF message
 538  * @skb: the NETLINK buffer
 539  * @info: the Generic NETLINK info block
 540  *
 541  * Description:
 542  * Process a user generated ADDDEF message and respond accordingly.  Returns
 543  * zero on success, negative values on failure.
 544  *
 545  */
 546 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
 547 {
 548         struct netlbl_audit audit_info;
 549
 550         if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
 551             (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
 552              info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
 553             (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
 554              info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
 555             ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
 556              (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
 557             ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
 558              (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
 559                 return -EINVAL;
 560
 561         netlbl_netlink_auditinfo(&audit_info);
 562
 563         return netlbl_mgmt_add_common(info, &audit_info);
 564 }
 565
 566 /**
 567  * netlbl_mgmt_removedef - Handle a REMOVEDEF message
 568  * @skb: the NETLINK buffer
 569  * @info: the Generic NETLINK info block
 570  *
 571  * Description:
 572  * Process a user generated REMOVEDEF message and remove the default domain
 573  * mapping.  Returns zero on success, negative values on failure.
 574  *
 575  */
 576 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
 577 {
 578         struct netlbl_audit audit_info;
 579
 580         netlbl_netlink_auditinfo(&audit_info);
 581
 582         return netlbl_domhsh_remove_default(AF_UNSPEC, &audit_info);
 583 }
 584
 585 /**
 586  * netlbl_mgmt_listdef - Handle a LISTDEF message
 587  * @skb: the NETLINK buffer
 588  * @info: the Generic NETLINK info block
 589  *
 590  * Description:
 591  * Process a user generated LISTDEF message and dumps the default domain
 592  * mapping in a form suitable for use in a kernel generated LISTDEF message.
 593  * Returns zero on success, negative values on failure.
 594  *
 595  */
 596 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
 597 {
 598         int ret_val = -ENOMEM;
 599         struct sk_buff *ans_skb = NULL;
 600         void *data;
 601         struct netlbl_dom_map *entry;
 602         u16 family;
 603
 604         if (info->attrs[NLBL_MGMT_A_FAMILY])
 605                 family = nla_get_u16(info->attrs[NLBL_MGMT_A_FAMILY]);
 606         else
 607                 family = AF_INET;
 608
 609         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 610         if (ans_skb == NULL)
 611                 return -ENOMEM;
 612         data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 613                                  0, NLBL_MGMT_C_LISTDEF);
 614         if (data == NULL)
 615                 goto listdef_failure;
 616
 617         rcu_read_lock();
 618         entry = netlbl_domhsh_getentry(NULL, family);
 619         if (entry == NULL) {
 620                 ret_val = -ENOENT;
 621                 goto listdef_failure_lock;
 622         }
 623         ret_val = netlbl_mgmt_listentry(ans_skb, entry);
 624         rcu_read_unlock();
 625         if (ret_val != 0)
 626                 goto listdef_failure;
 627
 628         genlmsg_end(ans_skb, data);
 629         return genlmsg_reply(ans_skb, info);
 630
 631 listdef_failure_lock:
 632         rcu_read_unlock();
 633 listdef_failure:
 634         kfree_skb(ans_skb);
 635         return ret_val;
 636 }
 637
 638 /**
 639  * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
 640  * @skb: the skb to write to
 641  * @cb: the NETLINK callback
 642  * @protocol: the NetLabel protocol to use in the message
 643  *
 644  * Description:
 645  * This function is to be used in conjunction with netlbl_mgmt_protocols() to
 646  * answer a application's PROTOCOLS message.  Returns the size of the message
 647  * on success, negative values on failure.
 648  *
 649  */
 650 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
 651                                     struct netlink_callback *cb,
 652                                     u32 protocol)
 653 {
 654         int ret_val = -ENOMEM;
 655         void *data;
 656
 657         data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 658                            &netlbl_mgmt_gnl_family, NLM_F_MULTI,
 659                            NLBL_MGMT_C_PROTOCOLS);
 660         if (data == NULL)
 661                 goto protocols_cb_failure;
 662
 663         ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
 664         if (ret_val != 0)
 665                 goto protocols_cb_failure;
 666
 667         genlmsg_end(skb, data);
 668         return 0;
 669
 670 protocols_cb_failure:
 671         genlmsg_cancel(skb, data);
 672         return ret_val;
 673 }
 674
 675 /**
 676  * netlbl_mgmt_protocols - Handle a PROTOCOLS message
 677  * @skb: the NETLINK buffer
 678  * @cb: the NETLINK callback
 679  *
 680  * Description:
 681  * Process a user generated PROTOCOLS message and respond accordingly.
 682  *
 683  */
 684 static int netlbl_mgmt_protocols(struct sk_buff *skb,
 685                                  struct netlink_callback *cb)
 686 {
 687         u32 protos_sent = cb->args[0];
 688
 689         if (protos_sent == 0) {
 690                 if (netlbl_mgmt_protocols_cb(skb,
 691                                              cb,
 692                                              NETLBL_NLTYPE_UNLABELED) < 0)
 693                         goto protocols_return;
 694                 protos_sent++;
 695         }
 696         if (protos_sent == 1) {
 697                 if (netlbl_mgmt_protocols_cb(skb,
 698                                              cb,
 699                                              NETLBL_NLTYPE_CIPSOV4) < 0)
 700                         goto protocols_return;
 701                 protos_sent++;
 702         }
 703 #if IS_ENABLED(CONFIG_IPV6)
 704         if (protos_sent == 2) {
 705                 if (netlbl_mgmt_protocols_cb(skb,
 706                                              cb,
 707                                              NETLBL_NLTYPE_CALIPSO) < 0)
 708                         goto protocols_return;
 709                 protos_sent++;
 710         }
 711 #endif
 712
 713 protocols_return:
 714         cb->args[0] = protos_sent;
 715         return skb->len;
 716 }
 717
 718 /**
 719  * netlbl_mgmt_version - Handle a VERSION message
 720  * @skb: the NETLINK buffer
 721  * @info: the Generic NETLINK info block
 722  *
 723  * Description:
 724  * Process a user generated VERSION message and respond accordingly.  Returns
 725  * zero on success, negative values on failure.
 726  *
 727  */
 728 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
 729 {
 730         int ret_val = -ENOMEM;
 731         struct sk_buff *ans_skb = NULL;
 732         void *data;
 733
 734         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 735         if (ans_skb == NULL)
 736                 return -ENOMEM;
 737         data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
 738                                  0, NLBL_MGMT_C_VERSION);
 739         if (data == NULL)
 740                 goto version_failure;
 741
 742         ret_val = nla_put_u32(ans_skb,
 743                               NLBL_MGMT_A_VERSION,
 744                               NETLBL_PROTO_VERSION);
 745         if (ret_val != 0)
 746                 goto version_failure;
 747
 748         genlmsg_end(ans_skb, data);
 749         return genlmsg_reply(ans_skb, info);
 750
 751 version_failure:
 752         kfree_skb(ans_skb);
 753         return ret_val;
 754 }
 755
 756
 757 /*
 758  * NetLabel Generic NETLINK Command Definitions
 759  */
 760
 761 static const struct genl_small_ops netlbl_mgmt_genl_ops[] = {
 762         {
 763         .cmd = NLBL_MGMT_C_ADD,
 764         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 765         .flags = GENL_ADMIN_PERM,
 766         .doit = netlbl_mgmt_add,
 767         .dumpit = NULL,
 768         },
 769         {
 770         .cmd = NLBL_MGMT_C_REMOVE,
 771         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 772         .flags = GENL_ADMIN_PERM,
 773         .doit = netlbl_mgmt_remove,
 774         .dumpit = NULL,
 775         },
 776         {
 777         .cmd = NLBL_MGMT_C_LISTALL,
 778         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 779         .flags = 0,
 780         .doit = NULL,
 781         .dumpit = netlbl_mgmt_listall,
 782         },
 783         {
 784         .cmd = NLBL_MGMT_C_ADDDEF,
 785         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 786         .flags = GENL_ADMIN_PERM,
 787         .doit = netlbl_mgmt_adddef,
 788         .dumpit = NULL,
 789         },
 790         {
 791         .cmd = NLBL_MGMT_C_REMOVEDEF,
 792         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 793         .flags = GENL_ADMIN_PERM,
 794         .doit = netlbl_mgmt_removedef,
 795         .dumpit = NULL,
 796         },
 797         {
 798         .cmd = NLBL_MGMT_C_LISTDEF,
 799         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 800         .flags = 0,
 801         .doit = netlbl_mgmt_listdef,
 802         .dumpit = NULL,
 803         },
 804         {
 805         .cmd = NLBL_MGMT_C_PROTOCOLS,
 806         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 807         .flags = 0,
 808         .doit = NULL,
 809         .dumpit = netlbl_mgmt_protocols,
 810         },
 811         {
 812         .cmd = NLBL_MGMT_C_VERSION,
 813         .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 814         .flags = 0,
 815         .doit = netlbl_mgmt_version,
 816         .dumpit = NULL,
 817         },
 818 };
 819
 820 static struct genl_family netlbl_mgmt_gnl_family __ro_after_init = {
 821         .hdrsize = 0,
 822         .name = NETLBL_NLTYPE_MGMT_NAME,
 823         .version = NETLBL_PROTO_VERSION,
 824         .maxattr = NLBL_MGMT_A_MAX,
 825         .policy = netlbl_mgmt_genl_policy,
 826         .module = THIS_MODULE,
 827         .small_ops = netlbl_mgmt_genl_ops,
 828         .n_small_ops = ARRAY_SIZE(netlbl_mgmt_genl_ops),
 829         .resv_start_op = NLBL_MGMT_C_VERSION + 1,
 830 };
 831
 832 /*
 833  * NetLabel Generic NETLINK Protocol Functions
 834  */
 835
 836 /**
 837  * netlbl_mgmt_genl_init - Register the NetLabel management component
 838  *
 839  * Description:
 840  * Register the NetLabel management component with the Generic NETLINK
 841  * mechanism.  Returns zero on success, negative values on failure.
 842  *
 843  */
 844 int __init netlbl_mgmt_genl_init(void)
 845 {
 846         return genl_register_family(&netlbl_mgmt_gnl_family);
 847 }