net/netlabel/netlabel_unlabeled.c

   1 /*
   2  * NetLabel Unlabeled Support
   3  *
   4  * This file defines functions for dealing with unlabeled packets for the
   5  * NetLabel system.  The NetLabel system manages static and dynamic label
   6  * mappings for network 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 - 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, 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/rcupdate.h>
  33 #include <linux/list.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/socket.h>
  36 #include <linux/string.h>
  37 #include <linux/skbuff.h>
  38 #include <linux/audit.h>
  39 #include <linux/in.h>
  40 #include <linux/in6.h>
  41 #include <linux/ip.h>
  42 #include <linux/ipv6.h>
  43 #include <linux/notifier.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/security.h>
  46 #include <linux/slab.h>
  47 #include <net/sock.h>
  48 #include <net/netlink.h>
  49 #include <net/genetlink.h>
  50 #include <net/ip.h>
  51 #include <net/ipv6.h>
  52 #include <net/net_namespace.h>
  53 #include <net/netlabel.h>
  54 #include <asm/bug.h>
  55 #include <asm/atomic.h>
  56
  57 #include "netlabel_user.h"
  58 #include "netlabel_addrlist.h"
  59 #include "netlabel_domainhash.h"
  60 #include "netlabel_unlabeled.h"
  61 #include "netlabel_mgmt.h"
  62
  63 /* NOTE: at present we always use init's network namespace since we don't
  64  *       presently support different namespaces even though the majority of
  65  *       the functions in this file are "namespace safe" */
  66
  67 /* The unlabeled connection hash table which we use to map network interfaces
  68  * and addresses of unlabeled packets to a user specified secid value for the
  69  * LSM.  The hash table is used to lookup the network interface entry
  70  * (struct netlbl_unlhsh_iface) and then the interface entry is used to
  71  * lookup an IP address match from an ordered list.  If a network interface
  72  * match can not be found in the hash table then the default entry
  73  * (netlbl_unlhsh_def) is used.  The IP address entry list
  74  * (struct netlbl_unlhsh_addr) is ordered such that the entries with a
  75  * larger netmask come first.
  76  */
  77 struct netlbl_unlhsh_tbl {
  78         struct list_head *tbl;
  79         u32 size;
  80 };
  81 #define netlbl_unlhsh_addr4_entry(iter) \
  82         container_of(iter, struct netlbl_unlhsh_addr4, list)
  83 struct netlbl_unlhsh_addr4 {
  84         u32 secid;
  85
  86         struct netlbl_af4list list;
  87         struct rcu_head rcu;
  88 };
  89 #define netlbl_unlhsh_addr6_entry(iter) \
  90         container_of(iter, struct netlbl_unlhsh_addr6, list)
  91 struct netlbl_unlhsh_addr6 {
  92         u32 secid;
  93
  94         struct netlbl_af6list list;
  95         struct rcu_head rcu;
  96 };
  97 struct netlbl_unlhsh_iface {
  98         int ifindex;
  99         struct list_head addr4_list;
 100         struct list_head addr6_list;
 101
 102         u32 valid;
 103         struct list_head list;
 104         struct rcu_head rcu;
 105 };
 106
 107 /* Argument struct for netlbl_unlhsh_walk() */
 108 struct netlbl_unlhsh_walk_arg {
 109         struct netlink_callback *nl_cb;
 110         struct sk_buff *skb;
 111         u32 seq;
 112 };
 113
 114 /* Unlabeled connection hash table */
 115 /* updates should be so rare that having one spinlock for the entire
 116  * hash table should be okay */
 117 static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
 118 #define netlbl_unlhsh_rcu_deref(p) \
 119         rcu_dereference_check(p, rcu_read_lock_held() || \
 120                                  lockdep_is_held(&netlbl_unlhsh_lock))
 121 static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
 122 static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
 123
 124 /* Accept unlabeled packets flag */
 125 static u8 netlabel_unlabel_acceptflg = 0;
 126
 127 /* NetLabel Generic NETLINK unlabeled family */
 128 static struct genl_family netlbl_unlabel_gnl_family = {
 129         .id = GENL_ID_GENERATE,
 130         .hdrsize = 0,
 131         .name = NETLBL_NLTYPE_UNLABELED_NAME,
 132         .version = NETLBL_PROTO_VERSION,
 133         .maxattr = NLBL_UNLABEL_A_MAX,
 134 };
 135
 136 /* NetLabel Netlink attribute policy */
 137 static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
 138         [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
 139         [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
 140                                       .len = sizeof(struct in6_addr) },
 141         [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
 142                                       .len = sizeof(struct in6_addr) },
 143         [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
 144                                       .len = sizeof(struct in_addr) },
 145         [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
 146                                       .len = sizeof(struct in_addr) },
 147         [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
 148                                    .len = IFNAMSIZ - 1 },
 149         [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
 150 };
 151
 152 /*
 153  * Unlabeled Connection Hash Table Functions
 154  */
 155
 156 /**
 157  * netlbl_unlhsh_free_addr4 - Frees an IPv4 address entry from the hash table
 158  * @entry: the entry's RCU field
 159  *
 160  * Description:
 161  * This function is designed to be used as a callback to the call_rcu()
 162  * function so that memory allocated to a hash table address entry can be
 163  * released safely.
 164  *
 165  */
 166 static void netlbl_unlhsh_free_addr4(struct rcu_head *entry)
 167 {
 168         struct netlbl_unlhsh_addr4 *ptr;
 169
 170         ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu);
 171         kfree(ptr);
 172 }
 173
 174 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 175 /**
 176  * netlbl_unlhsh_free_addr6 - Frees an IPv6 address entry from the hash table
 177  * @entry: the entry's RCU field
 178  *
 179  * Description:
 180  * This function is designed to be used as a callback to the call_rcu()
 181  * function so that memory allocated to a hash table address entry can be
 182  * released safely.
 183  *
 184  */
 185 static void netlbl_unlhsh_free_addr6(struct rcu_head *entry)
 186 {
 187         struct netlbl_unlhsh_addr6 *ptr;
 188
 189         ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu);
 190         kfree(ptr);
 191 }
 192 #endif /* IPv6 */
 193
 194 /**
 195  * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
 196  * @entry: the entry's RCU field
 197  *
 198  * Description:
 199  * This function is designed to be used as a callback to the call_rcu()
 200  * function so that memory allocated to a hash table interface entry can be
 201  * released safely.  It is important to note that this function does not free
 202  * the IPv4 and IPv6 address lists contained as part of an interface entry.  It
 203  * is up to the rest of the code to make sure an interface entry is only freed
 204  * once it's address lists are empty.
 205  *
 206  */
 207 static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
 208 {
 209         struct netlbl_unlhsh_iface *iface;
 210         struct netlbl_af4list *iter4;
 211         struct netlbl_af4list *tmp4;
 212 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 213         struct netlbl_af6list *iter6;
 214         struct netlbl_af6list *tmp6;
 215 #endif /* IPv6 */
 216
 217         iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
 218
 219         /* no need for locks here since we are the only one with access to this
 220          * structure */
 221
 222         netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
 223                 netlbl_af4list_remove_entry(iter4);
 224                 kfree(netlbl_unlhsh_addr4_entry(iter4));
 225         }
 226 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 227         netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
 228                 netlbl_af6list_remove_entry(iter6);
 229                 kfree(netlbl_unlhsh_addr6_entry(iter6));
 230         }
 231 #endif /* IPv6 */
 232         kfree(iface);
 233 }
 234
 235 /**
 236  * netlbl_unlhsh_hash - Hashing function for the hash table
 237  * @ifindex: the network interface/device to hash
 238  *
 239  * Description:
 240  * This is the hashing function for the unlabeled hash table, it returns the
 241  * bucket number for the given device/interface.  The caller is responsible for
 242  * ensuring that the hash table is protected with either a RCU read lock or
 243  * the hash table lock.
 244  *
 245  */
 246 static u32 netlbl_unlhsh_hash(int ifindex)
 247 {
 248         return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
 249 }
 250
 251 /**
 252  * netlbl_unlhsh_search_iface - Search for a matching interface entry
 253  * @ifindex: the network interface
 254  *
 255  * Description:
 256  * Searches the unlabeled connection hash table and returns a pointer to the
 257  * interface entry which matches @ifindex, otherwise NULL is returned.  The
 258  * caller is responsible for ensuring that the hash table is protected with
 259  * either a RCU read lock or the hash table lock.
 260  *
 261  */
 262 static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
 263 {
 264         u32 bkt;
 265         struct list_head *bkt_list;
 266         struct netlbl_unlhsh_iface *iter;
 267
 268         bkt = netlbl_unlhsh_hash(ifindex);
 269         bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
 270         list_for_each_entry_rcu(iter, bkt_list, list)
 271                 if (iter->valid && iter->ifindex == ifindex)
 272                         return iter;
 273
 274         return NULL;
 275 }
 276
 277 /**
 278  * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
 279  * @iface: the associated interface entry
 280  * @addr: IPv4 address in network byte order
 281  * @mask: IPv4 address mask in network byte order
 282  * @secid: LSM secid value for entry
 283  *
 284  * Description:
 285  * Add a new address entry into the unlabeled connection hash table using the
 286  * interface entry specified by @iface.  On success zero is returned, otherwise
 287  * a negative value is returned.
 288  *
 289  */
 290 static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
 291                                    const struct in_addr *addr,
 292                                    const struct in_addr *mask,
 293                                    u32 secid)
 294 {
 295         int ret_val;
 296         struct netlbl_unlhsh_addr4 *entry;
 297
 298         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 299         if (entry == NULL)
 300                 return -ENOMEM;
 301
 302         entry->list.addr = addr->s_addr & mask->s_addr;
 303         entry->list.mask = mask->s_addr;
 304         entry->list.valid = 1;
 305         entry->secid = secid;
 306
 307         spin_lock(&netlbl_unlhsh_lock);
 308         ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
 309         spin_unlock(&netlbl_unlhsh_lock);
 310
 311         if (ret_val != 0)
 312                 kfree(entry);
 313         return ret_val;
 314 }
 315
 316 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 317 /**
 318  * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
 319  * @iface: the associated interface entry
 320  * @addr: IPv6 address in network byte order
 321  * @mask: IPv6 address mask in network byte order
 322  * @secid: LSM secid value for entry
 323  *
 324  * Description:
 325  * Add a new address entry into the unlabeled connection hash table using the
 326  * interface entry specified by @iface.  On success zero is returned, otherwise
 327  * a negative value is returned.
 328  *
 329  */
 330 static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
 331                                    const struct in6_addr *addr,
 332                                    const struct in6_addr *mask,
 333                                    u32 secid)
 334 {
 335         int ret_val;
 336         struct netlbl_unlhsh_addr6 *entry;
 337
 338         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 339         if (entry == NULL)
 340                 return -ENOMEM;
 341
 342         ipv6_addr_copy(&entry->list.addr, addr);
 343         entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
 344         entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
 345         entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
 346         entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
 347         ipv6_addr_copy(&entry->list.mask, mask);
 348         entry->list.valid = 1;
 349         entry->secid = secid;
 350
 351         spin_lock(&netlbl_unlhsh_lock);
 352         ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
 353         spin_unlock(&netlbl_unlhsh_lock);
 354
 355         if (ret_val != 0)
 356                 kfree(entry);
 357         return 0;
 358 }
 359 #endif /* IPv6 */
 360
 361 /**
 362  * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
 363  * @ifindex: network interface
 364  *
 365  * Description:
 366  * Add a new, empty, interface entry into the unlabeled connection hash table.
 367  * On success a pointer to the new interface entry is returned, on failure NULL
 368  * is returned.
 369  *
 370  */
 371 static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
 372 {
 373         u32 bkt;
 374         struct netlbl_unlhsh_iface *iface;
 375
 376         iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
 377         if (iface == NULL)
 378                 return NULL;
 379
 380         iface->ifindex = ifindex;
 381         INIT_LIST_HEAD(&iface->addr4_list);
 382         INIT_LIST_HEAD(&iface->addr6_list);
 383         iface->valid = 1;
 384
 385         spin_lock(&netlbl_unlhsh_lock);
 386         if (ifindex > 0) {
 387                 bkt = netlbl_unlhsh_hash(ifindex);
 388                 if (netlbl_unlhsh_search_iface(ifindex) != NULL)
 389                         goto add_iface_failure;
 390                 list_add_tail_rcu(&iface->list,
 391                              &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
 392         } else {
 393                 INIT_LIST_HEAD(&iface->list);
 394                 if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
 395                         goto add_iface_failure;
 396                 rcu_assign_pointer(netlbl_unlhsh_def, iface);
 397         }
 398         spin_unlock(&netlbl_unlhsh_lock);
 399
 400         return iface;
 401
 402 add_iface_failure:
 403         spin_unlock(&netlbl_unlhsh_lock);
 404         kfree(iface);
 405         return NULL;
 406 }
 407
 408 /**
 409  * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
 410  * @net: network namespace
 411  * @dev_name: interface name
 412  * @addr: IP address in network byte order
 413  * @mask: address mask in network byte order
 414  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
 415  * @secid: LSM secid value for the entry
 416  * @audit_info: NetLabel audit information
 417  *
 418  * Description:
 419  * Adds a new entry to the unlabeled connection hash table.  Returns zero on
 420  * success, negative values on failure.
 421  *
 422  */
 423 int netlbl_unlhsh_add(struct net *net,
 424                       const char *dev_name,
 425                       const void *addr,
 426                       const void *mask,
 427                       u32 addr_len,
 428                       u32 secid,
 429                       struct netlbl_audit *audit_info)
 430 {
 431         int ret_val;
 432         int ifindex;
 433         struct net_device *dev;
 434         struct netlbl_unlhsh_iface *iface;
 435         struct audit_buffer *audit_buf = NULL;
 436         char *secctx = NULL;
 437         u32 secctx_len;
 438
 439         if (addr_len != sizeof(struct in_addr) &&
 440             addr_len != sizeof(struct in6_addr))
 441                 return -EINVAL;
 442
 443         rcu_read_lock();
 444         if (dev_name != NULL) {
 445                 dev = dev_get_by_name_rcu(net, dev_name);
 446                 if (dev == NULL) {
 447                         ret_val = -ENODEV;
 448                         goto unlhsh_add_return;
 449                 }
 450                 ifindex = dev->ifindex;
 451                 iface = netlbl_unlhsh_search_iface(ifindex);
 452         } else {
 453                 ifindex = 0;
 454                 iface = rcu_dereference(netlbl_unlhsh_def);
 455         }
 456         if (iface == NULL) {
 457                 iface = netlbl_unlhsh_add_iface(ifindex);
 458                 if (iface == NULL) {
 459                         ret_val = -ENOMEM;
 460                         goto unlhsh_add_return;
 461                 }
 462         }
 463         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
 464                                               audit_info);
 465         switch (addr_len) {
 466         case sizeof(struct in_addr): {
 467                 struct in_addr *addr4, *mask4;
 468
 469                 addr4 = (struct in_addr *)addr;
 470                 mask4 = (struct in_addr *)mask;
 471                 ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
 472                 if (audit_buf != NULL)
 473                         netlbl_af4list_audit_addr(audit_buf, 1,
 474                                                   dev_name,
 475                                                   addr4->s_addr,
 476                                                   mask4->s_addr);
 477                 break;
 478         }
 479 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 480         case sizeof(struct in6_addr): {
 481                 struct in6_addr *addr6, *mask6;
 482
 483                 addr6 = (struct in6_addr *)addr;
 484                 mask6 = (struct in6_addr *)mask;
 485                 ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
 486                 if (audit_buf != NULL)
 487                         netlbl_af6list_audit_addr(audit_buf, 1,
 488                                                   dev_name,
 489                                                   addr6, mask6);
 490                 break;
 491         }
 492 #endif /* IPv6 */
 493         default:
 494                 ret_val = -EINVAL;
 495         }
 496         if (ret_val == 0)
 497                 atomic_inc(&netlabel_mgmt_protocount);
 498
 499 unlhsh_add_return:
 500         rcu_read_unlock();
 501         if (audit_buf != NULL) {
 502                 if (security_secid_to_secctx(secid,
 503                                              &secctx,
 504                                              &secctx_len) == 0) {
 505                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
 506                         security_release_secctx(secctx, secctx_len);
 507                 }
 508                 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
 509                 audit_log_end(audit_buf);
 510         }
 511         return ret_val;
 512 }
 513
 514 /**
 515  * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
 516  * @net: network namespace
 517  * @iface: interface entry
 518  * @addr: IP address
 519  * @mask: IP address mask
 520  * @audit_info: NetLabel audit information
 521  *
 522  * Description:
 523  * Remove an IP address entry from the unlabeled connection hash table.
 524  * Returns zero on success, negative values on failure.
 525  *
 526  */
 527 static int netlbl_unlhsh_remove_addr4(struct net *net,
 528                                       struct netlbl_unlhsh_iface *iface,
 529                                       const struct in_addr *addr,
 530                                       const struct in_addr *mask,
 531                                       struct netlbl_audit *audit_info)
 532 {
 533         struct netlbl_af4list *list_entry;
 534         struct netlbl_unlhsh_addr4 *entry;
 535         struct audit_buffer *audit_buf;
 536         struct net_device *dev;
 537         char *secctx;
 538         u32 secctx_len;
 539
 540         spin_lock(&netlbl_unlhsh_lock);
 541         list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
 542                                            &iface->addr4_list);
 543         spin_unlock(&netlbl_unlhsh_lock);
 544         if (list_entry != NULL)
 545                 entry = netlbl_unlhsh_addr4_entry(list_entry);
 546         else
 547                 entry = NULL;
 548
 549         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
 550                                               audit_info);
 551         if (audit_buf != NULL) {
 552                 dev = dev_get_by_index(net, iface->ifindex);
 553                 netlbl_af4list_audit_addr(audit_buf, 1,
 554                                           (dev != NULL ? dev->name : NULL),
 555                                           addr->s_addr, mask->s_addr);
 556                 if (dev != NULL)
 557                         dev_put(dev);
 558                 if (entry != NULL &&
 559                     security_secid_to_secctx(entry->secid,
 560                                              &secctx, &secctx_len) == 0) {
 561                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
 562                         security_release_secctx(secctx, secctx_len);
 563                 }
 564                 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
 565                 audit_log_end(audit_buf);
 566         }
 567
 568         if (entry == NULL)
 569                 return -ENOENT;
 570
 571         call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
 572         return 0;
 573 }
 574
 575 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 576 /**
 577  * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
 578  * @net: network namespace
 579  * @iface: interface entry
 580  * @addr: IP address
 581  * @mask: IP address mask
 582  * @audit_info: NetLabel audit information
 583  *
 584  * Description:
 585  * Remove an IP address entry from the unlabeled connection hash table.
 586  * Returns zero on success, negative values on failure.
 587  *
 588  */
 589 static int netlbl_unlhsh_remove_addr6(struct net *net,
 590                                       struct netlbl_unlhsh_iface *iface,
 591                                       const struct in6_addr *addr,
 592                                       const struct in6_addr *mask,
 593                                       struct netlbl_audit *audit_info)
 594 {
 595         struct netlbl_af6list *list_entry;
 596         struct netlbl_unlhsh_addr6 *entry;
 597         struct audit_buffer *audit_buf;
 598         struct net_device *dev;
 599         char *secctx;
 600         u32 secctx_len;
 601
 602         spin_lock(&netlbl_unlhsh_lock);
 603         list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
 604         spin_unlock(&netlbl_unlhsh_lock);
 605         if (list_entry != NULL)
 606                 entry = netlbl_unlhsh_addr6_entry(list_entry);
 607         else
 608                 entry = NULL;
 609
 610         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
 611                                               audit_info);
 612         if (audit_buf != NULL) {
 613                 dev = dev_get_by_index(net, iface->ifindex);
 614                 netlbl_af6list_audit_addr(audit_buf, 1,
 615                                           (dev != NULL ? dev->name : NULL),
 616                                           addr, mask);
 617                 if (dev != NULL)
 618                         dev_put(dev);
 619                 if (entry != NULL &&
 620                     security_secid_to_secctx(entry->secid,
 621                                              &secctx, &secctx_len) == 0) {
 622                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
 623                         security_release_secctx(secctx, secctx_len);
 624                 }
 625                 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
 626                 audit_log_end(audit_buf);
 627         }
 628
 629         if (entry == NULL)
 630                 return -ENOENT;
 631
 632         call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
 633         return 0;
 634 }
 635 #endif /* IPv6 */
 636
 637 /**
 638  * netlbl_unlhsh_condremove_iface - Remove an interface entry
 639  * @iface: the interface entry
 640  *
 641  * Description:
 642  * Remove an interface entry from the unlabeled connection hash table if it is
 643  * empty.  An interface entry is considered to be empty if there are no
 644  * address entries assigned to it.
 645  *
 646  */
 647 static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
 648 {
 649         struct netlbl_af4list *iter4;
 650 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 651         struct netlbl_af6list *iter6;
 652 #endif /* IPv6 */
 653
 654         spin_lock(&netlbl_unlhsh_lock);
 655         netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
 656                 goto unlhsh_condremove_failure;
 657 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 658         netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
 659                 goto unlhsh_condremove_failure;
 660 #endif /* IPv6 */
 661         iface->valid = 0;
 662         if (iface->ifindex > 0)
 663                 list_del_rcu(&iface->list);
 664         else
 665                 rcu_assign_pointer(netlbl_unlhsh_def, NULL);
 666         spin_unlock(&netlbl_unlhsh_lock);
 667
 668         call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
 669         return;
 670
 671 unlhsh_condremove_failure:
 672         spin_unlock(&netlbl_unlhsh_lock);
 673 }
 674
 675 /**
 676  * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
 677  * @net: network namespace
 678  * @dev_name: interface name
 679  * @addr: IP address in network byte order
 680  * @mask: address mask in network byte order
 681  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
 682  * @audit_info: NetLabel audit information
 683  *
 684  * Description:
 685  * Removes and existing entry from the unlabeled connection hash table.
 686  * Returns zero on success, negative values on failure.
 687  *
 688  */
 689 int netlbl_unlhsh_remove(struct net *net,
 690                          const char *dev_name,
 691                          const void *addr,
 692                          const void *mask,
 693                          u32 addr_len,
 694                          struct netlbl_audit *audit_info)
 695 {
 696         int ret_val;
 697         struct net_device *dev;
 698         struct netlbl_unlhsh_iface *iface;
 699
 700         if (addr_len != sizeof(struct in_addr) &&
 701             addr_len != sizeof(struct in6_addr))
 702                 return -EINVAL;
 703
 704         rcu_read_lock();
 705         if (dev_name != NULL) {
 706                 dev = dev_get_by_name_rcu(net, dev_name);
 707                 if (dev == NULL) {
 708                         ret_val = -ENODEV;
 709                         goto unlhsh_remove_return;
 710                 }
 711                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
 712         } else
 713                 iface = rcu_dereference(netlbl_unlhsh_def);
 714         if (iface == NULL) {
 715                 ret_val = -ENOENT;
 716                 goto unlhsh_remove_return;
 717         }
 718         switch (addr_len) {
 719         case sizeof(struct in_addr):
 720                 ret_val = netlbl_unlhsh_remove_addr4(net,
 721                                                      iface, addr, mask,
 722                                                      audit_info);
 723                 break;
 724 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 725         case sizeof(struct in6_addr):
 726                 ret_val = netlbl_unlhsh_remove_addr6(net,
 727                                                      iface, addr, mask,
 728                                                      audit_info);
 729                 break;
 730 #endif /* IPv6 */
 731         default:
 732                 ret_val = -EINVAL;
 733         }
 734         if (ret_val == 0) {
 735                 netlbl_unlhsh_condremove_iface(iface);
 736                 atomic_dec(&netlabel_mgmt_protocount);
 737         }
 738
 739 unlhsh_remove_return:
 740         rcu_read_unlock();
 741         return ret_val;
 742 }
 743
 744 /*
 745  * General Helper Functions
 746  */
 747
 748 /**
 749  * netlbl_unlhsh_netdev_handler - Network device notification handler
 750  * @this: notifier block
 751  * @event: the event
 752  * @ptr: the network device (cast to void)
 753  *
 754  * Description:
 755  * Handle network device events, although at present all we care about is a
 756  * network device going away.  In the case of a device going away we clear any
 757  * related entries from the unlabeled connection hash table.
 758  *
 759  */
 760 static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
 761                                         unsigned long event,
 762                                         void *ptr)
 763 {
 764         struct net_device *dev = ptr;
 765         struct netlbl_unlhsh_iface *iface = NULL;
 766
 767         if (!net_eq(dev_net(dev), &init_net))
 768                 return NOTIFY_DONE;
 769
 770         /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
 771         if (event == NETDEV_DOWN) {
 772                 spin_lock(&netlbl_unlhsh_lock);
 773                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
 774                 if (iface != NULL && iface->valid) {
 775                         iface->valid = 0;
 776                         list_del_rcu(&iface->list);
 777                 } else
 778                         iface = NULL;
 779                 spin_unlock(&netlbl_unlhsh_lock);
 780         }
 781
 782         if (iface != NULL)
 783                 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
 784
 785         return NOTIFY_DONE;
 786 }
 787
 788 /**
 789  * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
 790  * @value: desired value
 791  * @audit_info: NetLabel audit information
 792  *
 793  * Description:
 794  * Set the value of the unlabeled accept flag to @value.
 795  *
 796  */
 797 static void netlbl_unlabel_acceptflg_set(u8 value,
 798                                          struct netlbl_audit *audit_info)
 799 {
 800         struct audit_buffer *audit_buf;
 801         u8 old_val;
 802
 803         old_val = netlabel_unlabel_acceptflg;
 804         netlabel_unlabel_acceptflg = value;
 805         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
 806                                               audit_info);
 807         if (audit_buf != NULL) {
 808                 audit_log_format(audit_buf,
 809                                  " unlbl_accept=%u old=%u", value, old_val);
 810                 audit_log_end(audit_buf);
 811         }
 812 }
 813
 814 /**
 815  * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
 816  * @info: the Generic NETLINK info block
 817  * @addr: the IP address
 818  * @mask: the IP address mask
 819  * @len: the address length
 820  *
 821  * Description:
 822  * Examine the Generic NETLINK message and extract the IP address information.
 823  * Returns zero on success, negative values on failure.
 824  *
 825  */
 826 static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
 827                                        void **addr,
 828                                        void **mask,
 829                                        u32 *len)
 830 {
 831         u32 addr_len;
 832
 833         if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
 834                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
 835                 if (addr_len != sizeof(struct in_addr) &&
 836                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
 837                         return -EINVAL;
 838                 *len = addr_len;
 839                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
 840                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
 841                 return 0;
 842         } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
 843                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
 844                 if (addr_len != sizeof(struct in6_addr) &&
 845                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
 846                         return -EINVAL;
 847                 *len = addr_len;
 848                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
 849                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
 850                 return 0;
 851         }
 852
 853         return -EINVAL;
 854 }
 855
 856 /*
 857  * NetLabel Command Handlers
 858  */
 859
 860 /**
 861  * netlbl_unlabel_accept - Handle an ACCEPT message
 862  * @skb: the NETLINK buffer
 863  * @info: the Generic NETLINK info block
 864  *
 865  * Description:
 866  * Process a user generated ACCEPT message and set the accept flag accordingly.
 867  * Returns zero on success, negative values on failure.
 868  *
 869  */
 870 static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
 871 {
 872         u8 value;
 873         struct netlbl_audit audit_info;
 874
 875         if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
 876                 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
 877                 if (value == 1 || value == 0) {
 878                         netlbl_netlink_auditinfo(skb, &audit_info);
 879                         netlbl_unlabel_acceptflg_set(value, &audit_info);
 880                         return 0;
 881                 }
 882         }
 883
 884         return -EINVAL;
 885 }
 886
 887 /**
 888  * netlbl_unlabel_list - Handle a LIST message
 889  * @skb: the NETLINK buffer
 890  * @info: the Generic NETLINK info block
 891  *
 892  * Description:
 893  * Process a user generated LIST message and respond with the current status.
 894  * Returns zero on success, negative values on failure.
 895  *
 896  */
 897 static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
 898 {
 899         int ret_val = -EINVAL;
 900         struct sk_buff *ans_skb;
 901         void *data;
 902
 903         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 904         if (ans_skb == NULL)
 905                 goto list_failure;
 906         data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
 907                                  0, NLBL_UNLABEL_C_LIST);
 908         if (data == NULL) {
 909                 ret_val = -ENOMEM;
 910                 goto list_failure;
 911         }
 912
 913         ret_val = nla_put_u8(ans_skb,
 914                              NLBL_UNLABEL_A_ACPTFLG,
 915                              netlabel_unlabel_acceptflg);
 916         if (ret_val != 0)
 917                 goto list_failure;
 918
 919         genlmsg_end(ans_skb, data);
 920         return genlmsg_reply(ans_skb, info);
 921
 922 list_failure:
 923         kfree_skb(ans_skb);
 924         return ret_val;
 925 }
 926
 927 /**
 928  * netlbl_unlabel_staticadd - Handle a STATICADD message
 929  * @skb: the NETLINK buffer
 930  * @info: the Generic NETLINK info block
 931  *
 932  * Description:
 933  * Process a user generated STATICADD message and add a new unlabeled
 934  * connection entry to the hash table.  Returns zero on success, negative
 935  * values on failure.
 936  *
 937  */
 938 static int netlbl_unlabel_staticadd(struct sk_buff *skb,
 939                                     struct genl_info *info)
 940 {
 941         int ret_val;
 942         char *dev_name;
 943         void *addr;
 944         void *mask;
 945         u32 addr_len;
 946         u32 secid;
 947         struct netlbl_audit audit_info;
 948
 949         /* Don't allow users to add both IPv4 and IPv6 addresses for a
 950          * single entry.  However, allow users to create two entries, one each
 951          * for IPv4 and IPv4, with the same LSM security context which should
 952          * achieve the same result. */
 953         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
 954             !info->attrs[NLBL_UNLABEL_A_IFACE] ||
 955             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
 956                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
 957               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
 958                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
 959                 return -EINVAL;
 960
 961         netlbl_netlink_auditinfo(skb, &audit_info);
 962
 963         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
 964         if (ret_val != 0)
 965                 return ret_val;
 966         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
 967         ret_val = security_secctx_to_secid(
 968                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
 969                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
 970                                   &secid);
 971         if (ret_val != 0)
 972                 return ret_val;
 973
 974         return netlbl_unlhsh_add(&init_net,
 975                                  dev_name, addr, mask, addr_len, secid,
 976                                  &audit_info);
 977 }
 978
 979 /**
 980  * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
 981  * @skb: the NETLINK buffer
 982  * @info: the Generic NETLINK info block
 983  *
 984  * Description:
 985  * Process a user generated STATICADDDEF message and add a new default
 986  * unlabeled connection entry.  Returns zero on success, negative values on
 987  * failure.
 988  *
 989  */
 990 static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
 991                                        struct genl_info *info)
 992 {
 993         int ret_val;
 994         void *addr;
 995         void *mask;
 996         u32 addr_len;
 997         u32 secid;
 998         struct netlbl_audit audit_info;
 999
1000         /* Don't allow users to add both IPv4 and IPv6 addresses for a
1001          * single entry.  However, allow users to create two entries, one each
1002          * for IPv4 and IPv6, with the same LSM security context which should
1003          * achieve the same result. */
1004         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
1005             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1006                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1007               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1008                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1009                 return -EINVAL;
1010
1011         netlbl_netlink_auditinfo(skb, &audit_info);
1012
1013         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1014         if (ret_val != 0)
1015                 return ret_val;
1016         ret_val = security_secctx_to_secid(
1017                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1018                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1019                                   &secid);
1020         if (ret_val != 0)
1021                 return ret_val;
1022
1023         return netlbl_unlhsh_add(&init_net,
1024                                  NULL, addr, mask, addr_len, secid,
1025                                  &audit_info);
1026 }
1027
1028 /**
1029  * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
1030  * @skb: the NETLINK buffer
1031  * @info: the Generic NETLINK info block
1032  *
1033  * Description:
1034  * Process a user generated STATICREMOVE message and remove the specified
1035  * unlabeled connection entry.  Returns zero on success, negative values on
1036  * failure.
1037  *
1038  */
1039 static int netlbl_unlabel_staticremove(struct sk_buff *skb,
1040                                        struct genl_info *info)
1041 {
1042         int ret_val;
1043         char *dev_name;
1044         void *addr;
1045         void *mask;
1046         u32 addr_len;
1047         struct netlbl_audit audit_info;
1048
1049         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1050          * IPv4 and IPv6 in the same entry. */
1051         if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
1052             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1053                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1054               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1055                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1056                 return -EINVAL;
1057
1058         netlbl_netlink_auditinfo(skb, &audit_info);
1059
1060         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1061         if (ret_val != 0)
1062                 return ret_val;
1063         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1064
1065         return netlbl_unlhsh_remove(&init_net,
1066                                     dev_name, addr, mask, addr_len,
1067                                     &audit_info);
1068 }
1069
1070 /**
1071  * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1072  * @skb: the NETLINK buffer
1073  * @info: the Generic NETLINK info block
1074  *
1075  * Description:
1076  * Process a user generated STATICREMOVEDEF message and remove the default
1077  * unlabeled connection entry.  Returns zero on success, negative values on
1078  * failure.
1079  *
1080  */
1081 static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1082                                           struct genl_info *info)
1083 {
1084         int ret_val;
1085         void *addr;
1086         void *mask;
1087         u32 addr_len;
1088         struct netlbl_audit audit_info;
1089
1090         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1091          * IPv4 and IPv6 in the same entry. */
1092         if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1093                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1094               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1095                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1096                 return -EINVAL;
1097
1098         netlbl_netlink_auditinfo(skb, &audit_info);
1099
1100         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1101         if (ret_val != 0)
1102                 return ret_val;
1103
1104         return netlbl_unlhsh_remove(&init_net,
1105                                     NULL, addr, mask, addr_len,
1106                                     &audit_info);
1107 }
1108
1109
1110 /**
1111  * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1112  * @cmd: command/message
1113  * @iface: the interface entry
1114  * @addr4: the IPv4 address entry
1115  * @addr6: the IPv6 address entry
1116  * @arg: the netlbl_unlhsh_walk_arg structure
1117  *
1118  * Description:
1119  * This function is designed to be used to generate a response for a
1120  * STATICLIST or STATICLISTDEF message.  When called either @addr4 or @addr6
1121  * can be specified, not both, the other unspecified entry should be set to
1122  * NULL by the caller.  Returns the size of the message on success, negative
1123  * values on failure.
1124  *
1125  */
1126 static int netlbl_unlabel_staticlist_gen(u32 cmd,
1127                                        const struct netlbl_unlhsh_iface *iface,
1128                                        const struct netlbl_unlhsh_addr4 *addr4,
1129                                        const struct netlbl_unlhsh_addr6 *addr6,
1130                                        void *arg)
1131 {
1132         int ret_val = -ENOMEM;
1133         struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1134         struct net_device *dev;
1135         void *data;
1136         u32 secid;
1137         char *secctx;
1138         u32 secctx_len;
1139
1140         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
1141                            cb_arg->seq, &netlbl_unlabel_gnl_family,
1142                            NLM_F_MULTI, cmd);
1143         if (data == NULL)
1144                 goto list_cb_failure;
1145
1146         if (iface->ifindex > 0) {
1147                 dev = dev_get_by_index(&init_net, iface->ifindex);
1148                 if (!dev) {
1149                         ret_val = -ENODEV;
1150                         goto list_cb_failure;
1151                 }
1152                 ret_val = nla_put_string(cb_arg->skb,
1153                                          NLBL_UNLABEL_A_IFACE, dev->name);
1154                 dev_put(dev);
1155                 if (ret_val != 0)
1156                         goto list_cb_failure;
1157         }
1158
1159         if (addr4) {
1160                 struct in_addr addr_struct;
1161
1162                 addr_struct.s_addr = addr4->list.addr;
1163                 ret_val = nla_put(cb_arg->skb,
1164                                   NLBL_UNLABEL_A_IPV4ADDR,
1165                                   sizeof(struct in_addr),
1166                                   &addr_struct);
1167                 if (ret_val != 0)
1168                         goto list_cb_failure;
1169
1170                 addr_struct.s_addr = addr4->list.mask;
1171                 ret_val = nla_put(cb_arg->skb,
1172                                   NLBL_UNLABEL_A_IPV4MASK,
1173                                   sizeof(struct in_addr),
1174                                   &addr_struct);
1175                 if (ret_val != 0)
1176                         goto list_cb_failure;
1177
1178                 secid = addr4->secid;
1179         } else {
1180                 ret_val = nla_put(cb_arg->skb,
1181                                   NLBL_UNLABEL_A_IPV6ADDR,
1182                                   sizeof(struct in6_addr),
1183                                   &addr6->list.addr);
1184                 if (ret_val != 0)
1185                         goto list_cb_failure;
1186
1187                 ret_val = nla_put(cb_arg->skb,
1188                                   NLBL_UNLABEL_A_IPV6MASK,
1189                                   sizeof(struct in6_addr),
1190                                   &addr6->list.mask);
1191                 if (ret_val != 0)
1192                         goto list_cb_failure;
1193
1194                 secid = addr6->secid;
1195         }
1196
1197         ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
1198         if (ret_val != 0)
1199                 goto list_cb_failure;
1200         ret_val = nla_put(cb_arg->skb,
1201                           NLBL_UNLABEL_A_SECCTX,
1202                           secctx_len,
1203                           secctx);
1204         security_release_secctx(secctx, secctx_len);
1205         if (ret_val != 0)
1206                 goto list_cb_failure;
1207
1208         cb_arg->seq++;
1209         return genlmsg_end(cb_arg->skb, data);
1210
1211 list_cb_failure:
1212         genlmsg_cancel(cb_arg->skb, data);
1213         return ret_val;
1214 }
1215
1216 /**
1217  * netlbl_unlabel_staticlist - Handle a STATICLIST message
1218  * @skb: the NETLINK buffer
1219  * @cb: the NETLINK callback
1220  *
1221  * Description:
1222  * Process a user generated STATICLIST message and dump the unlabeled
1223  * connection hash table in a form suitable for use in a kernel generated
1224  * STATICLIST message.  Returns the length of @skb.
1225  *
1226  */
1227 static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1228                                      struct netlink_callback *cb)
1229 {
1230         struct netlbl_unlhsh_walk_arg cb_arg;
1231         u32 skip_bkt = cb->args[0];
1232         u32 skip_chain = cb->args[1];
1233         u32 skip_addr4 = cb->args[2];
1234         u32 skip_addr6 = cb->args[3];
1235         u32 iter_bkt;
1236         u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1237         struct netlbl_unlhsh_iface *iface;
1238         struct list_head *iter_list;
1239         struct netlbl_af4list *addr4;
1240 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1241         struct netlbl_af6list *addr6;
1242 #endif
1243
1244         cb_arg.nl_cb = cb;
1245         cb_arg.skb = skb;
1246         cb_arg.seq = cb->nlh->nlmsg_seq;
1247
1248         rcu_read_lock();
1249         for (iter_bkt = skip_bkt;
1250              iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1251              iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
1252                 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
1253                 list_for_each_entry_rcu(iface, iter_list, list) {
1254                         if (!iface->valid ||
1255                             iter_chain++ < skip_chain)
1256                                 continue;
1257                         netlbl_af4list_foreach_rcu(addr4,
1258                                                    &iface->addr4_list) {
1259                                 if (iter_addr4++ < skip_addr4)
1260                                         continue;
1261                                 if (netlbl_unlabel_staticlist_gen(
1262                                               NLBL_UNLABEL_C_STATICLIST,
1263                                               iface,
1264                                               netlbl_unlhsh_addr4_entry(addr4),
1265                                               NULL,
1266                                               &cb_arg) < 0) {
1267                                         iter_addr4--;
1268                                         iter_chain--;
1269                                         goto unlabel_staticlist_return;
1270                                 }
1271                         }
1272 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1273                         netlbl_af6list_foreach_rcu(addr6,
1274                                                    &iface->addr6_list) {
1275                                 if (iter_addr6++ < skip_addr6)
1276                                         continue;
1277                                 if (netlbl_unlabel_staticlist_gen(
1278                                               NLBL_UNLABEL_C_STATICLIST,
1279                                               iface,
1280                                               NULL,
1281                                               netlbl_unlhsh_addr6_entry(addr6),
1282                                               &cb_arg) < 0) {
1283                                         iter_addr6--;
1284                                         iter_chain--;
1285                                         goto unlabel_staticlist_return;
1286                                 }
1287                         }
1288 #endif /* IPv6 */
1289                 }
1290         }
1291
1292 unlabel_staticlist_return:
1293         rcu_read_unlock();
1294         cb->args[0] = skip_bkt;
1295         cb->args[1] = skip_chain;
1296         cb->args[2] = skip_addr4;
1297         cb->args[3] = skip_addr6;
1298         return skb->len;
1299 }
1300
1301 /**
1302  * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1303  * @skb: the NETLINK buffer
1304  * @cb: the NETLINK callback
1305  *
1306  * Description:
1307  * Process a user generated STATICLISTDEF message and dump the default
1308  * unlabeled connection entry in a form suitable for use in a kernel generated
1309  * STATICLISTDEF message.  Returns the length of @skb.
1310  *
1311  */
1312 static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1313                                         struct netlink_callback *cb)
1314 {
1315         struct netlbl_unlhsh_walk_arg cb_arg;
1316         struct netlbl_unlhsh_iface *iface;
1317         u32 skip_addr4 = cb->args[0];
1318         u32 skip_addr6 = cb->args[1];
1319         u32 iter_addr4 = 0;
1320         struct netlbl_af4list *addr4;
1321 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1322         u32 iter_addr6 = 0;
1323         struct netlbl_af6list *addr6;
1324 #endif
1325
1326         cb_arg.nl_cb = cb;
1327         cb_arg.skb = skb;
1328         cb_arg.seq = cb->nlh->nlmsg_seq;
1329
1330         rcu_read_lock();
1331         iface = rcu_dereference(netlbl_unlhsh_def);
1332         if (iface == NULL || !iface->valid)
1333                 goto unlabel_staticlistdef_return;
1334
1335         netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
1336                 if (iter_addr4++ < skip_addr4)
1337                         continue;
1338                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1339                                               iface,
1340                                               netlbl_unlhsh_addr4_entry(addr4),
1341                                               NULL,
1342                                               &cb_arg) < 0) {
1343                         iter_addr4--;
1344                         goto unlabel_staticlistdef_return;
1345                 }
1346         }
1347 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1348         netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
1349                 if (iter_addr6++ < skip_addr6)
1350                         continue;
1351                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1352                                               iface,
1353                                               NULL,
1354                                               netlbl_unlhsh_addr6_entry(addr6),
1355                                               &cb_arg) < 0) {
1356                         iter_addr6--;
1357                         goto unlabel_staticlistdef_return;
1358                 }
1359         }
1360 #endif /* IPv6 */
1361
1362 unlabel_staticlistdef_return:
1363         rcu_read_unlock();
1364         cb->args[0] = skip_addr4;
1365         cb->args[1] = skip_addr6;
1366         return skb->len;
1367 }
1368
1369 /*
1370  * NetLabel Generic NETLINK Command Definitions
1371  */
1372
1373 static struct genl_ops netlbl_unlabel_genl_ops[] = {
1374         {
1375         .cmd = NLBL_UNLABEL_C_STATICADD,
1376         .flags = GENL_ADMIN_PERM,
1377         .policy = netlbl_unlabel_genl_policy,
1378         .doit = netlbl_unlabel_staticadd,
1379         .dumpit = NULL,
1380         },
1381         {
1382         .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1383         .flags = GENL_ADMIN_PERM,
1384         .policy = netlbl_unlabel_genl_policy,
1385         .doit = netlbl_unlabel_staticremove,
1386         .dumpit = NULL,
1387         },
1388         {
1389         .cmd = NLBL_UNLABEL_C_STATICLIST,
1390         .flags = 0,
1391         .policy = netlbl_unlabel_genl_policy,
1392         .doit = NULL,
1393         .dumpit = netlbl_unlabel_staticlist,
1394         },
1395         {
1396         .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1397         .flags = GENL_ADMIN_PERM,
1398         .policy = netlbl_unlabel_genl_policy,
1399         .doit = netlbl_unlabel_staticadddef,
1400         .dumpit = NULL,
1401         },
1402         {
1403         .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1404         .flags = GENL_ADMIN_PERM,
1405         .policy = netlbl_unlabel_genl_policy,
1406         .doit = netlbl_unlabel_staticremovedef,
1407         .dumpit = NULL,
1408         },
1409         {
1410         .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1411         .flags = 0,
1412         .policy = netlbl_unlabel_genl_policy,
1413         .doit = NULL,
1414         .dumpit = netlbl_unlabel_staticlistdef,
1415         },
1416         {
1417         .cmd = NLBL_UNLABEL_C_ACCEPT,
1418         .flags = GENL_ADMIN_PERM,
1419         .policy = netlbl_unlabel_genl_policy,
1420         .doit = netlbl_unlabel_accept,
1421         .dumpit = NULL,
1422         },
1423         {
1424         .cmd = NLBL_UNLABEL_C_LIST,
1425         .flags = 0,
1426         .policy = netlbl_unlabel_genl_policy,
1427         .doit = netlbl_unlabel_list,
1428         .dumpit = NULL,
1429         },
1430 };
1431
1432 /*
1433  * NetLabel Generic NETLINK Protocol Functions
1434  */
1435
1436 /**
1437  * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
1438  *
1439  * Description:
1440  * Register the unlabeled packet NetLabel component with the Generic NETLINK
1441  * mechanism.  Returns zero on success, negative values on failure.
1442  *
1443  */
1444 int __init netlbl_unlabel_genl_init(void)
1445 {
1446         return genl_register_family_with_ops(&netlbl_unlabel_gnl_family,
1447                 netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops));
1448 }
1449
1450 /*
1451  * NetLabel KAPI Hooks
1452  */
1453
1454 static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1455         .notifier_call = netlbl_unlhsh_netdev_handler,
1456 };
1457
1458 /**
1459  * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1460  * @size: the number of bits to use for the hash buckets
1461  *
1462  * Description:
1463  * Initializes the unlabeled connection hash table and registers a network
1464  * device notification handler.  This function should only be called by the
1465  * NetLabel subsystem itself during initialization.  Returns zero on success,
1466  * non-zero values on error.
1467  *
1468  */
1469 int __init netlbl_unlabel_init(u32 size)
1470 {
1471         u32 iter;
1472         struct netlbl_unlhsh_tbl *hsh_tbl;
1473
1474         if (size == 0)
1475                 return -EINVAL;
1476
1477         hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1478         if (hsh_tbl == NULL)
1479                 return -ENOMEM;
1480         hsh_tbl->size = 1 << size;
1481         hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1482                                sizeof(struct list_head),
1483                                GFP_KERNEL);
1484         if (hsh_tbl->tbl == NULL) {
1485                 kfree(hsh_tbl);
1486                 return -ENOMEM;
1487         }
1488         for (iter = 0; iter < hsh_tbl->size; iter++)
1489                 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
1490
1491         rcu_read_lock();
1492         spin_lock(&netlbl_unlhsh_lock);
1493         rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1494         spin_unlock(&netlbl_unlhsh_lock);
1495         rcu_read_unlock();
1496
1497         register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
1498
1499         return 0;
1500 }
1501
1502 /**
1503  * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1504  * @skb: the packet
1505  * @family: protocol family
1506  * @secattr: the security attributes
1507  *
1508  * Description:
1509  * Determine the security attributes, if any, for an unlabled packet and return
1510  * them in @secattr.  Returns zero on success and negative values on failure.
1511  *
1512  */
1513 int netlbl_unlabel_getattr(const struct sk_buff *skb,
1514                            u16 family,
1515                            struct netlbl_lsm_secattr *secattr)
1516 {
1517         struct netlbl_unlhsh_iface *iface;
1518
1519         rcu_read_lock();
1520         iface = netlbl_unlhsh_search_iface(skb->skb_iif);
1521         if (iface == NULL)
1522                 iface = rcu_dereference(netlbl_unlhsh_def);
1523         if (iface == NULL || !iface->valid)
1524                 goto unlabel_getattr_nolabel;
1525         switch (family) {
1526         case PF_INET: {
1527                 struct iphdr *hdr4;
1528                 struct netlbl_af4list *addr4;
1529
1530                 hdr4 = ip_hdr(skb);
1531                 addr4 = netlbl_af4list_search(hdr4->saddr,
1532                                               &iface->addr4_list);
1533                 if (addr4 == NULL)
1534                         goto unlabel_getattr_nolabel;
1535                 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
1536                 break;
1537         }
1538 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1539         case PF_INET6: {
1540                 struct ipv6hdr *hdr6;
1541                 struct netlbl_af6list *addr6;
1542
1543                 hdr6 = ipv6_hdr(skb);
1544                 addr6 = netlbl_af6list_search(&hdr6->saddr,
1545                                               &iface->addr6_list);
1546                 if (addr6 == NULL)
1547                         goto unlabel_getattr_nolabel;
1548                 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
1549                 break;
1550         }
1551 #endif /* IPv6 */
1552         default:
1553                 goto unlabel_getattr_nolabel;
1554         }
1555         rcu_read_unlock();
1556
1557         secattr->flags |= NETLBL_SECATTR_SECID;
1558         secattr->type = NETLBL_NLTYPE_UNLABELED;
1559         return 0;
1560
1561 unlabel_getattr_nolabel:
1562         rcu_read_unlock();
1563         if (netlabel_unlabel_acceptflg == 0)
1564                 return -ENOMSG;
1565         secattr->type = NETLBL_NLTYPE_UNLABELED;
1566         return 0;
1567 }
1568
1569 /**
1570  * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
1571  *
1572  * Description:
1573  * Set the default NetLabel configuration to allow incoming unlabeled packets
1574  * and to send unlabeled network traffic by default.
1575  *
1576  */
1577 int __init netlbl_unlabel_defconf(void)
1578 {
1579         int ret_val;
1580         struct netlbl_dom_map *entry;
1581         struct netlbl_audit audit_info;
1582
1583         /* Only the kernel is allowed to call this function and the only time
1584          * it is called is at bootup before the audit subsystem is reporting
1585          * messages so don't worry to much about these values. */
1586         security_task_getsecid(current, &audit_info.secid);
1587         audit_info.loginuid = 0;
1588         audit_info.sessionid = 0;
1589
1590         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1591         if (entry == NULL)
1592                 return -ENOMEM;
1593         entry->type = NETLBL_NLTYPE_UNLABELED;
1594         ret_val = netlbl_domhsh_add_default(entry, &audit_info);
1595         if (ret_val != 0)
1596                 return ret_val;
1597
1598         netlbl_unlabel_acceptflg_set(1, &audit_info);
1599
1600         return 0;
1601 }