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   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         return;
 674 }
 675
 676 /**
 677  * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
 678  * @net: network namespace
 679  * @dev_name: interface name
 680  * @addr: IP address in network byte order
 681  * @mask: address mask in network byte order
 682  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
 683  * @audit_info: NetLabel audit information
 684  *
 685  * Description:
 686  * Removes and existing entry from the unlabeled connection hash table.
 687  * Returns zero on success, negative values on failure.
 688  *
 689  */
 690 int netlbl_unlhsh_remove(struct net *net,
 691                          const char *dev_name,
 692                          const void *addr,
 693                          const void *mask,
 694                          u32 addr_len,
 695                          struct netlbl_audit *audit_info)
 696 {
 697         int ret_val;
 698         struct net_device *dev;
 699         struct netlbl_unlhsh_iface *iface;
 700
 701         if (addr_len != sizeof(struct in_addr) &&
 702             addr_len != sizeof(struct in6_addr))
 703                 return -EINVAL;
 704
 705         rcu_read_lock();
 706         if (dev_name != NULL) {
 707                 dev = dev_get_by_name_rcu(net, dev_name);
 708                 if (dev == NULL) {
 709                         ret_val = -ENODEV;
 710                         goto unlhsh_remove_return;
 711                 }
 712                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
 713         } else
 714                 iface = rcu_dereference(netlbl_unlhsh_def);
 715         if (iface == NULL) {
 716                 ret_val = -ENOENT;
 717                 goto unlhsh_remove_return;
 718         }
 719         switch (addr_len) {
 720         case sizeof(struct in_addr):
 721                 ret_val = netlbl_unlhsh_remove_addr4(net,
 722                                                      iface, addr, mask,
 723                                                      audit_info);
 724                 break;
 725 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 726         case sizeof(struct in6_addr):
 727                 ret_val = netlbl_unlhsh_remove_addr6(net,
 728                                                      iface, addr, mask,
 729                                                      audit_info);
 730                 break;
 731 #endif /* IPv6 */
 732         default:
 733                 ret_val = -EINVAL;
 734         }
 735         if (ret_val == 0) {
 736                 netlbl_unlhsh_condremove_iface(iface);
 737                 atomic_dec(&netlabel_mgmt_protocount);
 738         }
 739
 740 unlhsh_remove_return:
 741         rcu_read_unlock();
 742         return ret_val;
 743 }
 744
 745 /*
 746  * General Helper Functions
 747  */
 748
 749 /**
 750  * netlbl_unlhsh_netdev_handler - Network device notification handler
 751  * @this: notifier block
 752  * @event: the event
 753  * @ptr: the network device (cast to void)
 754  *
 755  * Description:
 756  * Handle network device events, although at present all we care about is a
 757  * network device going away.  In the case of a device going away we clear any
 758  * related entries from the unlabeled connection hash table.
 759  *
 760  */
 761 static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
 762                                         unsigned long event,
 763                                         void *ptr)
 764 {
 765         struct net_device *dev = ptr;
 766         struct netlbl_unlhsh_iface *iface = NULL;
 767
 768         if (!net_eq(dev_net(dev), &init_net))
 769                 return NOTIFY_DONE;
 770
 771         /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
 772         if (event == NETDEV_DOWN) {
 773                 spin_lock(&netlbl_unlhsh_lock);
 774                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
 775                 if (iface != NULL && iface->valid) {
 776                         iface->valid = 0;
 777                         list_del_rcu(&iface->list);
 778                 } else
 779                         iface = NULL;
 780                 spin_unlock(&netlbl_unlhsh_lock);
 781         }
 782
 783         if (iface != NULL)
 784                 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
 785
 786         return NOTIFY_DONE;
 787 }
 788
 789 /**
 790  * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
 791  * @value: desired value
 792  * @audit_info: NetLabel audit information
 793  *
 794  * Description:
 795  * Set the value of the unlabeled accept flag to @value.
 796  *
 797  */
 798 static void netlbl_unlabel_acceptflg_set(u8 value,
 799                                          struct netlbl_audit *audit_info)
 800 {
 801         struct audit_buffer *audit_buf;
 802         u8 old_val;
 803
 804         old_val = netlabel_unlabel_acceptflg;
 805         netlabel_unlabel_acceptflg = value;
 806         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
 807                                               audit_info);
 808         if (audit_buf != NULL) {
 809                 audit_log_format(audit_buf,
 810                                  " unlbl_accept=%u old=%u", value, old_val);
 811                 audit_log_end(audit_buf);
 812         }
 813 }
 814
 815 /**
 816  * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
 817  * @info: the Generic NETLINK info block
 818  * @addr: the IP address
 819  * @mask: the IP address mask
 820  * @len: the address length
 821  *
 822  * Description:
 823  * Examine the Generic NETLINK message and extract the IP address information.
 824  * Returns zero on success, negative values on failure.
 825  *
 826  */
 827 static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
 828                                        void **addr,
 829                                        void **mask,
 830                                        u32 *len)
 831 {
 832         u32 addr_len;
 833
 834         if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
 835                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
 836                 if (addr_len != sizeof(struct in_addr) &&
 837                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
 838                         return -EINVAL;
 839                 *len = addr_len;
 840                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
 841                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
 842                 return 0;
 843         } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
 844                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
 845                 if (addr_len != sizeof(struct in6_addr) &&
 846                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
 847                         return -EINVAL;
 848                 *len = addr_len;
 849                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
 850                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
 851                 return 0;
 852         }
 853
 854         return -EINVAL;
 855 }
 856
 857 /*
 858  * NetLabel Command Handlers
 859  */
 860
 861 /**
 862  * netlbl_unlabel_accept - Handle an ACCEPT message
 863  * @skb: the NETLINK buffer
 864  * @info: the Generic NETLINK info block
 865  *
 866  * Description:
 867  * Process a user generated ACCEPT message and set the accept flag accordingly.
 868  * Returns zero on success, negative values on failure.
 869  *
 870  */
 871 static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
 872 {
 873         u8 value;
 874         struct netlbl_audit audit_info;
 875
 876         if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
 877                 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
 878                 if (value == 1 || value == 0) {
 879                         netlbl_netlink_auditinfo(skb, &audit_info);
 880                         netlbl_unlabel_acceptflg_set(value, &audit_info);
 881                         return 0;
 882                 }
 883         }
 884
 885         return -EINVAL;
 886 }
 887
 888 /**
 889  * netlbl_unlabel_list - Handle a LIST message
 890  * @skb: the NETLINK buffer
 891  * @info: the Generic NETLINK info block
 892  *
 893  * Description:
 894  * Process a user generated LIST message and respond with the current status.
 895  * Returns zero on success, negative values on failure.
 896  *
 897  */
 898 static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
 899 {
 900         int ret_val = -EINVAL;
 901         struct sk_buff *ans_skb;
 902         void *data;
 903
 904         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 905         if (ans_skb == NULL)
 906                 goto list_failure;
 907         data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
 908                                  0, NLBL_UNLABEL_C_LIST);
 909         if (data == NULL) {
 910                 ret_val = -ENOMEM;
 911                 goto list_failure;
 912         }
 913
 914         ret_val = nla_put_u8(ans_skb,
 915                              NLBL_UNLABEL_A_ACPTFLG,
 916                              netlabel_unlabel_acceptflg);
 917         if (ret_val != 0)
 918                 goto list_failure;
 919
 920         genlmsg_end(ans_skb, data);
 921         return genlmsg_reply(ans_skb, info);
 922
 923 list_failure:
 924         kfree_skb(ans_skb);
 925         return ret_val;
 926 }
 927
 928 /**
 929  * netlbl_unlabel_staticadd - Handle a STATICADD message
 930  * @skb: the NETLINK buffer
 931  * @info: the Generic NETLINK info block
 932  *
 933  * Description:
 934  * Process a user generated STATICADD message and add a new unlabeled
 935  * connection entry to the hash table.  Returns zero on success, negative
 936  * values on failure.
 937  *
 938  */
 939 static int netlbl_unlabel_staticadd(struct sk_buff *skb,
 940                                     struct genl_info *info)
 941 {
 942         int ret_val;
 943         char *dev_name;
 944         void *addr;
 945         void *mask;
 946         u32 addr_len;
 947         u32 secid;
 948         struct netlbl_audit audit_info;
 949
 950         /* Don't allow users to add both IPv4 and IPv6 addresses for a
 951          * single entry.  However, allow users to create two entries, one each
 952          * for IPv4 and IPv4, with the same LSM security context which should
 953          * achieve the same result. */
 954         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
 955             !info->attrs[NLBL_UNLABEL_A_IFACE] ||
 956             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
 957                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
 958               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
 959                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
 960                 return -EINVAL;
 961
 962         netlbl_netlink_auditinfo(skb, &audit_info);
 963
 964         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
 965         if (ret_val != 0)
 966                 return ret_val;
 967         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
 968         ret_val = security_secctx_to_secid(
 969                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
 970                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
 971                                   &secid);
 972         if (ret_val != 0)
 973                 return ret_val;
 974
 975         return netlbl_unlhsh_add(&init_net,
 976                                  dev_name, addr, mask, addr_len, secid,
 977                                  &audit_info);
 978 }
 979
 980 /**
 981  * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
 982  * @skb: the NETLINK buffer
 983  * @info: the Generic NETLINK info block
 984  *
 985  * Description:
 986  * Process a user generated STATICADDDEF message and add a new default
 987  * unlabeled connection entry.  Returns zero on success, negative values on
 988  * failure.
 989  *
 990  */
 991 static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
 992                                        struct genl_info *info)
 993 {
 994         int ret_val;
 995         void *addr;
 996         void *mask;
 997         u32 addr_len;
 998         u32 secid;
 999         struct netlbl_audit audit_info;
1000
1001         /* Don't allow users to add both IPv4 and IPv6 addresses for a
1002          * single entry.  However, allow users to create two entries, one each
1003          * for IPv4 and IPv6, with the same LSM security context which should
1004          * achieve the same result. */
1005         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
1006             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1007                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1008               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1009                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1010                 return -EINVAL;
1011
1012         netlbl_netlink_auditinfo(skb, &audit_info);
1013
1014         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1015         if (ret_val != 0)
1016                 return ret_val;
1017         ret_val = security_secctx_to_secid(
1018                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1019                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1020                                   &secid);
1021         if (ret_val != 0)
1022                 return ret_val;
1023
1024         return netlbl_unlhsh_add(&init_net,
1025                                  NULL, addr, mask, addr_len, secid,
1026                                  &audit_info);
1027 }
1028
1029 /**
1030  * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
1031  * @skb: the NETLINK buffer
1032  * @info: the Generic NETLINK info block
1033  *
1034  * Description:
1035  * Process a user generated STATICREMOVE message and remove the specified
1036  * unlabeled connection entry.  Returns zero on success, negative values on
1037  * failure.
1038  *
1039  */
1040 static int netlbl_unlabel_staticremove(struct sk_buff *skb,
1041                                        struct genl_info *info)
1042 {
1043         int ret_val;
1044         char *dev_name;
1045         void *addr;
1046         void *mask;
1047         u32 addr_len;
1048         struct netlbl_audit audit_info;
1049
1050         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1051          * IPv4 and IPv6 in the same entry. */
1052         if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
1053             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1054                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1055               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1056                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1057                 return -EINVAL;
1058
1059         netlbl_netlink_auditinfo(skb, &audit_info);
1060
1061         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1062         if (ret_val != 0)
1063                 return ret_val;
1064         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1065
1066         return netlbl_unlhsh_remove(&init_net,
1067                                     dev_name, addr, mask, addr_len,
1068                                     &audit_info);
1069 }
1070
1071 /**
1072  * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1073  * @skb: the NETLINK buffer
1074  * @info: the Generic NETLINK info block
1075  *
1076  * Description:
1077  * Process a user generated STATICREMOVEDEF message and remove the default
1078  * unlabeled connection entry.  Returns zero on success, negative values on
1079  * failure.
1080  *
1081  */
1082 static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1083                                           struct genl_info *info)
1084 {
1085         int ret_val;
1086         void *addr;
1087         void *mask;
1088         u32 addr_len;
1089         struct netlbl_audit audit_info;
1090
1091         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1092          * IPv4 and IPv6 in the same entry. */
1093         if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1094                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1095               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1096                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1097                 return -EINVAL;
1098
1099         netlbl_netlink_auditinfo(skb, &audit_info);
1100
1101         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1102         if (ret_val != 0)
1103                 return ret_val;
1104
1105         return netlbl_unlhsh_remove(&init_net,
1106                                     NULL, addr, mask, addr_len,
1107                                     &audit_info);
1108 }
1109
1110
1111 /**
1112  * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1113  * @cmd: command/message
1114  * @iface: the interface entry
1115  * @addr4: the IPv4 address entry
1116  * @addr6: the IPv6 address entry
1117  * @arg: the netlbl_unlhsh_walk_arg structure
1118  *
1119  * Description:
1120  * This function is designed to be used to generate a response for a
1121  * STATICLIST or STATICLISTDEF message.  When called either @addr4 or @addr6
1122  * can be specified, not both, the other unspecified entry should be set to
1123  * NULL by the caller.  Returns the size of the message on success, negative
1124  * values on failure.
1125  *
1126  */
1127 static int netlbl_unlabel_staticlist_gen(u32 cmd,
1128                                        const struct netlbl_unlhsh_iface *iface,
1129                                        const struct netlbl_unlhsh_addr4 *addr4,
1130                                        const struct netlbl_unlhsh_addr6 *addr6,
1131                                        void *arg)
1132 {
1133         int ret_val = -ENOMEM;
1134         struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1135         struct net_device *dev;
1136         void *data;
1137         u32 secid;
1138         char *secctx;
1139         u32 secctx_len;
1140
1141         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
1142                            cb_arg->seq, &netlbl_unlabel_gnl_family,
1143                            NLM_F_MULTI, cmd);
1144         if (data == NULL)
1145                 goto list_cb_failure;
1146
1147         if (iface->ifindex > 0) {
1148                 dev = dev_get_by_index(&init_net, iface->ifindex);
1149                 if (!dev) {
1150                         ret_val = -ENODEV;
1151                         goto list_cb_failure;
1152                 }
1153                 ret_val = nla_put_string(cb_arg->skb,
1154                                          NLBL_UNLABEL_A_IFACE, dev->name);
1155                 dev_put(dev);
1156                 if (ret_val != 0)
1157                         goto list_cb_failure;
1158         }
1159
1160         if (addr4) {
1161                 struct in_addr addr_struct;
1162
1163                 addr_struct.s_addr = addr4->list.addr;
1164                 ret_val = nla_put(cb_arg->skb,
1165                                   NLBL_UNLABEL_A_IPV4ADDR,
1166                                   sizeof(struct in_addr),
1167                                   &addr_struct);
1168                 if (ret_val != 0)
1169                         goto list_cb_failure;
1170
1171                 addr_struct.s_addr = addr4->list.mask;
1172                 ret_val = nla_put(cb_arg->skb,
1173                                   NLBL_UNLABEL_A_IPV4MASK,
1174                                   sizeof(struct in_addr),
1175                                   &addr_struct);
1176                 if (ret_val != 0)
1177                         goto list_cb_failure;
1178
1179                 secid = addr4->secid;
1180         } else {
1181                 ret_val = nla_put(cb_arg->skb,
1182                                   NLBL_UNLABEL_A_IPV6ADDR,
1183                                   sizeof(struct in6_addr),
1184                                   &addr6->list.addr);
1185                 if (ret_val != 0)
1186                         goto list_cb_failure;
1187
1188                 ret_val = nla_put(cb_arg->skb,
1189                                   NLBL_UNLABEL_A_IPV6MASK,
1190                                   sizeof(struct in6_addr),
1191                                   &addr6->list.mask);
1192                 if (ret_val != 0)
1193                         goto list_cb_failure;
1194
1195                 secid = addr6->secid;
1196         }
1197
1198         ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
1199         if (ret_val != 0)
1200                 goto list_cb_failure;
1201         ret_val = nla_put(cb_arg->skb,
1202                           NLBL_UNLABEL_A_SECCTX,
1203                           secctx_len,
1204                           secctx);
1205         security_release_secctx(secctx, secctx_len);
1206         if (ret_val != 0)
1207                 goto list_cb_failure;
1208
1209         cb_arg->seq++;
1210         return genlmsg_end(cb_arg->skb, data);
1211
1212 list_cb_failure:
1213         genlmsg_cancel(cb_arg->skb, data);
1214         return ret_val;
1215 }
1216
1217 /**
1218  * netlbl_unlabel_staticlist - Handle a STATICLIST message
1219  * @skb: the NETLINK buffer
1220  * @cb: the NETLINK callback
1221  *
1222  * Description:
1223  * Process a user generated STATICLIST message and dump the unlabeled
1224  * connection hash table in a form suitable for use in a kernel generated
1225  * STATICLIST message.  Returns the length of @skb.
1226  *
1227  */
1228 static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1229                                      struct netlink_callback *cb)
1230 {
1231         struct netlbl_unlhsh_walk_arg cb_arg;
1232         u32 skip_bkt = cb->args[0];
1233         u32 skip_chain = cb->args[1];
1234         u32 skip_addr4 = cb->args[2];
1235         u32 skip_addr6 = cb->args[3];
1236         u32 iter_bkt;
1237         u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1238         struct netlbl_unlhsh_iface *iface;
1239         struct list_head *iter_list;
1240         struct netlbl_af4list *addr4;
1241 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1242         struct netlbl_af6list *addr6;
1243 #endif
1244
1245         cb_arg.nl_cb = cb;
1246         cb_arg.skb = skb;
1247         cb_arg.seq = cb->nlh->nlmsg_seq;
1248
1249         rcu_read_lock();
1250         for (iter_bkt = skip_bkt;
1251              iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1252              iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
1253                 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
1254                 list_for_each_entry_rcu(iface, iter_list, list) {
1255                         if (!iface->valid ||
1256                             iter_chain++ < skip_chain)
1257                                 continue;
1258                         netlbl_af4list_foreach_rcu(addr4,
1259                                                    &iface->addr4_list) {
1260                                 if (iter_addr4++ < skip_addr4)
1261                                         continue;
1262                                 if (netlbl_unlabel_staticlist_gen(
1263                                               NLBL_UNLABEL_C_STATICLIST,
1264                                               iface,
1265                                               netlbl_unlhsh_addr4_entry(addr4),
1266                                               NULL,
1267                                               &cb_arg) < 0) {
1268                                         iter_addr4--;
1269                                         iter_chain--;
1270                                         goto unlabel_staticlist_return;
1271                                 }
1272                         }
1273 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1274                         netlbl_af6list_foreach_rcu(addr6,
1275                                                    &iface->addr6_list) {
1276                                 if (iter_addr6++ < skip_addr6)
1277                                         continue;
1278                                 if (netlbl_unlabel_staticlist_gen(
1279                                               NLBL_UNLABEL_C_STATICLIST,
1280                                               iface,
1281                                               NULL,
1282                                               netlbl_unlhsh_addr6_entry(addr6),
1283                                               &cb_arg) < 0) {
1284                                         iter_addr6--;
1285                                         iter_chain--;
1286                                         goto unlabel_staticlist_return;
1287                                 }
1288                         }
1289 #endif /* IPv6 */
1290                 }
1291         }
1292
1293 unlabel_staticlist_return:
1294         rcu_read_unlock();
1295         cb->args[0] = skip_bkt;
1296         cb->args[1] = skip_chain;
1297         cb->args[2] = skip_addr4;
1298         cb->args[3] = skip_addr6;
1299         return skb->len;
1300 }
1301
1302 /**
1303  * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1304  * @skb: the NETLINK buffer
1305  * @cb: the NETLINK callback
1306  *
1307  * Description:
1308  * Process a user generated STATICLISTDEF message and dump the default
1309  * unlabeled connection entry in a form suitable for use in a kernel generated
1310  * STATICLISTDEF message.  Returns the length of @skb.
1311  *
1312  */
1313 static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1314                                         struct netlink_callback *cb)
1315 {
1316         struct netlbl_unlhsh_walk_arg cb_arg;
1317         struct netlbl_unlhsh_iface *iface;
1318         u32 skip_addr4 = cb->args[0];
1319         u32 skip_addr6 = cb->args[1];
1320         u32 iter_addr4 = 0;
1321         struct netlbl_af4list *addr4;
1322 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1323         u32 iter_addr6 = 0;
1324         struct netlbl_af6list *addr6;
1325 #endif
1326
1327         cb_arg.nl_cb = cb;
1328         cb_arg.skb = skb;
1329         cb_arg.seq = cb->nlh->nlmsg_seq;
1330
1331         rcu_read_lock();
1332         iface = rcu_dereference(netlbl_unlhsh_def);
1333         if (iface == NULL || !iface->valid)
1334                 goto unlabel_staticlistdef_return;
1335
1336         netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
1337                 if (iter_addr4++ < skip_addr4)
1338                         continue;
1339                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1340                                               iface,
1341                                               netlbl_unlhsh_addr4_entry(addr4),
1342                                               NULL,
1343                                               &cb_arg) < 0) {
1344                         iter_addr4--;
1345                         goto unlabel_staticlistdef_return;
1346                 }
1347         }
1348 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1349         netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
1350                 if (iter_addr6++ < skip_addr6)
1351                         continue;
1352                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1353                                               iface,
1354                                               NULL,
1355                                               netlbl_unlhsh_addr6_entry(addr6),
1356                                               &cb_arg) < 0) {
1357                         iter_addr6--;
1358                         goto unlabel_staticlistdef_return;
1359                 }
1360         }
1361 #endif /* IPv6 */
1362
1363 unlabel_staticlistdef_return:
1364         rcu_read_unlock();
1365         cb->args[0] = skip_addr4;
1366         cb->args[1] = skip_addr6;
1367         return skb->len;
1368 }
1369
1370 /*
1371  * NetLabel Generic NETLINK Command Definitions
1372  */
1373
1374 static struct genl_ops netlbl_unlabel_genl_ops[] = {
1375         {
1376         .cmd = NLBL_UNLABEL_C_STATICADD,
1377         .flags = GENL_ADMIN_PERM,
1378         .policy = netlbl_unlabel_genl_policy,
1379         .doit = netlbl_unlabel_staticadd,
1380         .dumpit = NULL,
1381         },
1382         {
1383         .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1384         .flags = GENL_ADMIN_PERM,
1385         .policy = netlbl_unlabel_genl_policy,
1386         .doit = netlbl_unlabel_staticremove,
1387         .dumpit = NULL,
1388         },
1389         {
1390         .cmd = NLBL_UNLABEL_C_STATICLIST,
1391         .flags = 0,
1392         .policy = netlbl_unlabel_genl_policy,
1393         .doit = NULL,
1394         .dumpit = netlbl_unlabel_staticlist,
1395         },
1396         {
1397         .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1398         .flags = GENL_ADMIN_PERM,
1399         .policy = netlbl_unlabel_genl_policy,
1400         .doit = netlbl_unlabel_staticadddef,
1401         .dumpit = NULL,
1402         },
1403         {
1404         .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1405         .flags = GENL_ADMIN_PERM,
1406         .policy = netlbl_unlabel_genl_policy,
1407         .doit = netlbl_unlabel_staticremovedef,
1408         .dumpit = NULL,
1409         },
1410         {
1411         .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1412         .flags = 0,
1413         .policy = netlbl_unlabel_genl_policy,
1414         .doit = NULL,
1415         .dumpit = netlbl_unlabel_staticlistdef,
1416         },
1417         {
1418         .cmd = NLBL_UNLABEL_C_ACCEPT,
1419         .flags = GENL_ADMIN_PERM,
1420         .policy = netlbl_unlabel_genl_policy,
1421         .doit = netlbl_unlabel_accept,
1422         .dumpit = NULL,
1423         },
1424         {
1425         .cmd = NLBL_UNLABEL_C_LIST,
1426         .flags = 0,
1427         .policy = netlbl_unlabel_genl_policy,
1428         .doit = netlbl_unlabel_list,
1429         .dumpit = NULL,
1430         },
1431 };
1432
1433 /*
1434  * NetLabel Generic NETLINK Protocol Functions
1435  */
1436
1437 /**
1438  * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
1439  *
1440  * Description:
1441  * Register the unlabeled packet NetLabel component with the Generic NETLINK
1442  * mechanism.  Returns zero on success, negative values on failure.
1443  *
1444  */
1445 int __init netlbl_unlabel_genl_init(void)
1446 {
1447         return genl_register_family_with_ops(&netlbl_unlabel_gnl_family,
1448                 netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops));
1449 }
1450
1451 /*
1452  * NetLabel KAPI Hooks
1453  */
1454
1455 static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1456         .notifier_call = netlbl_unlhsh_netdev_handler,
1457 };
1458
1459 /**
1460  * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1461  * @size: the number of bits to use for the hash buckets
1462  *
1463  * Description:
1464  * Initializes the unlabeled connection hash table and registers a network
1465  * device notification handler.  This function should only be called by the
1466  * NetLabel subsystem itself during initialization.  Returns zero on success,
1467  * non-zero values on error.
1468  *
1469  */
1470 int __init netlbl_unlabel_init(u32 size)
1471 {
1472         u32 iter;
1473         struct netlbl_unlhsh_tbl *hsh_tbl;
1474
1475         if (size == 0)
1476                 return -EINVAL;
1477
1478         hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1479         if (hsh_tbl == NULL)
1480                 return -ENOMEM;
1481         hsh_tbl->size = 1 << size;
1482         hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1483                                sizeof(struct list_head),
1484                                GFP_KERNEL);
1485         if (hsh_tbl->tbl == NULL) {
1486                 kfree(hsh_tbl);
1487                 return -ENOMEM;
1488         }
1489         for (iter = 0; iter < hsh_tbl->size; iter++)
1490                 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
1491
1492         rcu_read_lock();
1493         spin_lock(&netlbl_unlhsh_lock);
1494         rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1495         spin_unlock(&netlbl_unlhsh_lock);
1496         rcu_read_unlock();
1497
1498         register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
1499
1500         return 0;
1501 }
1502
1503 /**
1504  * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1505  * @skb: the packet
1506  * @family: protocol family
1507  * @secattr: the security attributes
1508  *
1509  * Description:
1510  * Determine the security attributes, if any, for an unlabled packet and return
1511  * them in @secattr.  Returns zero on success and negative values on failure.
1512  *
1513  */
1514 int netlbl_unlabel_getattr(const struct sk_buff *skb,
1515                            u16 family,
1516                            struct netlbl_lsm_secattr *secattr)
1517 {
1518         struct netlbl_unlhsh_iface *iface;
1519
1520         rcu_read_lock();
1521         iface = netlbl_unlhsh_search_iface(skb->skb_iif);
1522         if (iface == NULL)
1523                 iface = rcu_dereference(netlbl_unlhsh_def);
1524         if (iface == NULL || !iface->valid)
1525                 goto unlabel_getattr_nolabel;
1526         switch (family) {
1527         case PF_INET: {
1528                 struct iphdr *hdr4;
1529                 struct netlbl_af4list *addr4;
1530
1531                 hdr4 = ip_hdr(skb);
1532                 addr4 = netlbl_af4list_search(hdr4->saddr,
1533                                               &iface->addr4_list);
1534                 if (addr4 == NULL)
1535                         goto unlabel_getattr_nolabel;
1536                 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
1537                 break;
1538         }
1539 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1540         case PF_INET6: {
1541                 struct ipv6hdr *hdr6;
1542                 struct netlbl_af6list *addr6;
1543
1544                 hdr6 = ipv6_hdr(skb);
1545                 addr6 = netlbl_af6list_search(&hdr6->saddr,
1546                                               &iface->addr6_list);
1547                 if (addr6 == NULL)
1548                         goto unlabel_getattr_nolabel;
1549                 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
1550                 break;
1551         }
1552 #endif /* IPv6 */
1553         default:
1554                 goto unlabel_getattr_nolabel;
1555         }
1556         rcu_read_unlock();
1557
1558         secattr->flags |= NETLBL_SECATTR_SECID;
1559         secattr->type = NETLBL_NLTYPE_UNLABELED;
1560         return 0;
1561
1562 unlabel_getattr_nolabel:
1563         rcu_read_unlock();
1564         if (netlabel_unlabel_acceptflg == 0)
1565                 return -ENOMSG;
1566         secattr->type = NETLBL_NLTYPE_UNLABELED;
1567         return 0;
1568 }
1569
1570 /**
1571  * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
1572  *
1573  * Description:
1574  * Set the default NetLabel configuration to allow incoming unlabeled packets
1575  * and to send unlabeled network traffic by default.
1576  *
1577  */
1578 int __init netlbl_unlabel_defconf(void)
1579 {
1580         int ret_val;
1581         struct netlbl_dom_map *entry;
1582         struct netlbl_audit audit_info;
1583
1584         /* Only the kernel is allowed to call this function and the only time
1585          * it is called is at bootup before the audit subsystem is reporting
1586          * messages so don't worry to much about these values. */
1587         security_task_getsecid(current, &audit_info.secid);
1588         audit_info.loginuid = 0;
1589         audit_info.sessionid = 0;
1590
1591         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1592         if (entry == NULL)
1593                 return -ENOMEM;
1594         entry->type = NETLBL_NLTYPE_UNLABELED;
1595         ret_val = netlbl_domhsh_add_default(entry, &audit_info);
1596         if (ret_val != 0)
1597                 return ret_val;
1598
1599         netlbl_unlabel_acceptflg_set(1, &audit_info);
1600
1601         return 0;
1602 }