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Linux/net/netlabel/netlabel_unlabeled.c

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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@paul-moore.com>
  9  *
 10  */
 11 
 12 /*
 13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008
 14  *
 15  * This program is free software;  you can redistribute it and/or modify
 16  * it under the terms of the GNU General Public License as published by
 17  * the Free Software Foundation; either version 2 of the License, or
 18  * (at your option) any later version.
 19  *
 20  * This program is distributed in the hope that it will be useful,
 21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
 22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 23  * the GNU General Public License for more details.
 24  *
 25  * You should have received a copy of the GNU General Public License
 26  * along with this program;  if not, 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 <linux/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, lockdep_is_held(&netlbl_unlhsh_lock))
120 static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
121 static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
122 
123 /* Accept unlabeled packets flag */
124 static u8 netlabel_unlabel_acceptflg = 0;
125 
126 /* NetLabel Generic NETLINK unlabeled family */
127 static struct genl_family netlbl_unlabel_gnl_family = {
128         .id = GENL_ID_GENERATE,
129         .hdrsize = 0,
130         .name = NETLBL_NLTYPE_UNLABELED_NAME,
131         .version = NETLBL_PROTO_VERSION,
132         .maxattr = NLBL_UNLABEL_A_MAX,
133 };
134 
135 /* NetLabel Netlink attribute policy */
136 static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
137         [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
138         [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
139                                       .len = sizeof(struct in6_addr) },
140         [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
141                                       .len = sizeof(struct in6_addr) },
142         [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
143                                       .len = sizeof(struct in_addr) },
144         [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
145                                       .len = sizeof(struct in_addr) },
146         [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
147                                    .len = IFNAMSIZ - 1 },
148         [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
149 };
150 
151 /*
152  * Unlabeled Connection Hash Table Functions
153  */
154 
155 /**
156  * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
157  * @entry: the entry's RCU field
158  *
159  * Description:
160  * This function is designed to be used as a callback to the call_rcu()
161  * function so that memory allocated to a hash table interface entry can be
162  * released safely.  It is important to note that this function does not free
163  * the IPv4 and IPv6 address lists contained as part of an interface entry.  It
164  * is up to the rest of the code to make sure an interface entry is only freed
165  * once it's address lists are empty.
166  *
167  */
168 static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
169 {
170         struct netlbl_unlhsh_iface *iface;
171         struct netlbl_af4list *iter4;
172         struct netlbl_af4list *tmp4;
173 #if IS_ENABLED(CONFIG_IPV6)
174         struct netlbl_af6list *iter6;
175         struct netlbl_af6list *tmp6;
176 #endif /* IPv6 */
177 
178         iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
179 
180         /* no need for locks here since we are the only one with access to this
181          * structure */
182 
183         netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
184                 netlbl_af4list_remove_entry(iter4);
185                 kfree(netlbl_unlhsh_addr4_entry(iter4));
186         }
187 #if IS_ENABLED(CONFIG_IPV6)
188         netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
189                 netlbl_af6list_remove_entry(iter6);
190                 kfree(netlbl_unlhsh_addr6_entry(iter6));
191         }
192 #endif /* IPv6 */
193         kfree(iface);
194 }
195 
196 /**
197  * netlbl_unlhsh_hash - Hashing function for the hash table
198  * @ifindex: the network interface/device to hash
199  *
200  * Description:
201  * This is the hashing function for the unlabeled hash table, it returns the
202  * bucket number for the given device/interface.  The caller is responsible for
203  * ensuring that the hash table is protected with either a RCU read lock or
204  * the hash table lock.
205  *
206  */
207 static u32 netlbl_unlhsh_hash(int ifindex)
208 {
209         return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
210 }
211 
212 /**
213  * netlbl_unlhsh_search_iface - Search for a matching interface entry
214  * @ifindex: the network interface
215  *
216  * Description:
217  * Searches the unlabeled connection hash table and returns a pointer to the
218  * interface entry which matches @ifindex, otherwise NULL is returned.  The
219  * caller is responsible for ensuring that the hash table is protected with
220  * either a RCU read lock or the hash table lock.
221  *
222  */
223 static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
224 {
225         u32 bkt;
226         struct list_head *bkt_list;
227         struct netlbl_unlhsh_iface *iter;
228 
229         bkt = netlbl_unlhsh_hash(ifindex);
230         bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
231         list_for_each_entry_rcu(iter, bkt_list, list)
232                 if (iter->valid && iter->ifindex == ifindex)
233                         return iter;
234 
235         return NULL;
236 }
237 
238 /**
239  * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
240  * @iface: the associated interface entry
241  * @addr: IPv4 address in network byte order
242  * @mask: IPv4 address mask in network byte order
243  * @secid: LSM secid value for entry
244  *
245  * Description:
246  * Add a new address entry into the unlabeled connection hash table using the
247  * interface entry specified by @iface.  On success zero is returned, otherwise
248  * a negative value is returned.
249  *
250  */
251 static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
252                                    const struct in_addr *addr,
253                                    const struct in_addr *mask,
254                                    u32 secid)
255 {
256         int ret_val;
257         struct netlbl_unlhsh_addr4 *entry;
258 
259         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
260         if (entry == NULL)
261                 return -ENOMEM;
262 
263         entry->list.addr = addr->s_addr & mask->s_addr;
264         entry->list.mask = mask->s_addr;
265         entry->list.valid = 1;
266         entry->secid = secid;
267 
268         spin_lock(&netlbl_unlhsh_lock);
269         ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
270         spin_unlock(&netlbl_unlhsh_lock);
271 
272         if (ret_val != 0)
273                 kfree(entry);
274         return ret_val;
275 }
276 
277 #if IS_ENABLED(CONFIG_IPV6)
278 /**
279  * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
280  * @iface: the associated interface entry
281  * @addr: IPv6 address in network byte order
282  * @mask: IPv6 address mask in network byte order
283  * @secid: LSM secid value for entry
284  *
285  * Description:
286  * Add a new address entry into the unlabeled connection hash table using the
287  * interface entry specified by @iface.  On success zero is returned, otherwise
288  * a negative value is returned.
289  *
290  */
291 static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
292                                    const struct in6_addr *addr,
293                                    const struct in6_addr *mask,
294                                    u32 secid)
295 {
296         int ret_val;
297         struct netlbl_unlhsh_addr6 *entry;
298 
299         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
300         if (entry == NULL)
301                 return -ENOMEM;
302 
303         entry->list.addr = *addr;
304         entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
305         entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
306         entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
307         entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
308         entry->list.mask = *mask;
309         entry->list.valid = 1;
310         entry->secid = secid;
311 
312         spin_lock(&netlbl_unlhsh_lock);
313         ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
314         spin_unlock(&netlbl_unlhsh_lock);
315 
316         if (ret_val != 0)
317                 kfree(entry);
318         return 0;
319 }
320 #endif /* IPv6 */
321 
322 /**
323  * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
324  * @ifindex: network interface
325  *
326  * Description:
327  * Add a new, empty, interface entry into the unlabeled connection hash table.
328  * On success a pointer to the new interface entry is returned, on failure NULL
329  * is returned.
330  *
331  */
332 static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
333 {
334         u32 bkt;
335         struct netlbl_unlhsh_iface *iface;
336 
337         iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
338         if (iface == NULL)
339                 return NULL;
340 
341         iface->ifindex = ifindex;
342         INIT_LIST_HEAD(&iface->addr4_list);
343         INIT_LIST_HEAD(&iface->addr6_list);
344         iface->valid = 1;
345 
346         spin_lock(&netlbl_unlhsh_lock);
347         if (ifindex > 0) {
348                 bkt = netlbl_unlhsh_hash(ifindex);
349                 if (netlbl_unlhsh_search_iface(ifindex) != NULL)
350                         goto add_iface_failure;
351                 list_add_tail_rcu(&iface->list,
352                              &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
353         } else {
354                 INIT_LIST_HEAD(&iface->list);
355                 if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
356                         goto add_iface_failure;
357                 rcu_assign_pointer(netlbl_unlhsh_def, iface);
358         }
359         spin_unlock(&netlbl_unlhsh_lock);
360 
361         return iface;
362 
363 add_iface_failure:
364         spin_unlock(&netlbl_unlhsh_lock);
365         kfree(iface);
366         return NULL;
367 }
368 
369 /**
370  * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
371  * @net: network namespace
372  * @dev_name: interface name
373  * @addr: IP address in network byte order
374  * @mask: address mask in network byte order
375  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
376  * @secid: LSM secid value for the entry
377  * @audit_info: NetLabel audit information
378  *
379  * Description:
380  * Adds a new entry to the unlabeled connection hash table.  Returns zero on
381  * success, negative values on failure.
382  *
383  */
384 int netlbl_unlhsh_add(struct net *net,
385                       const char *dev_name,
386                       const void *addr,
387                       const void *mask,
388                       u32 addr_len,
389                       u32 secid,
390                       struct netlbl_audit *audit_info)
391 {
392         int ret_val;
393         int ifindex;
394         struct net_device *dev;
395         struct netlbl_unlhsh_iface *iface;
396         struct audit_buffer *audit_buf = NULL;
397         char *secctx = NULL;
398         u32 secctx_len;
399 
400         if (addr_len != sizeof(struct in_addr) &&
401             addr_len != sizeof(struct in6_addr))
402                 return -EINVAL;
403 
404         rcu_read_lock();
405         if (dev_name != NULL) {
406                 dev = dev_get_by_name_rcu(net, dev_name);
407                 if (dev == NULL) {
408                         ret_val = -ENODEV;
409                         goto unlhsh_add_return;
410                 }
411                 ifindex = dev->ifindex;
412                 iface = netlbl_unlhsh_search_iface(ifindex);
413         } else {
414                 ifindex = 0;
415                 iface = rcu_dereference(netlbl_unlhsh_def);
416         }
417         if (iface == NULL) {
418                 iface = netlbl_unlhsh_add_iface(ifindex);
419                 if (iface == NULL) {
420                         ret_val = -ENOMEM;
421                         goto unlhsh_add_return;
422                 }
423         }
424         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
425                                               audit_info);
426         switch (addr_len) {
427         case sizeof(struct in_addr): {
428                 const struct in_addr *addr4 = addr;
429                 const struct in_addr *mask4 = mask;
430 
431                 ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
432                 if (audit_buf != NULL)
433                         netlbl_af4list_audit_addr(audit_buf, 1,
434                                                   dev_name,
435                                                   addr4->s_addr,
436                                                   mask4->s_addr);
437                 break;
438         }
439 #if IS_ENABLED(CONFIG_IPV6)
440         case sizeof(struct in6_addr): {
441                 const struct in6_addr *addr6 = addr;
442                 const struct in6_addr *mask6 = mask;
443 
444                 ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
445                 if (audit_buf != NULL)
446                         netlbl_af6list_audit_addr(audit_buf, 1,
447                                                   dev_name,
448                                                   addr6, mask6);
449                 break;
450         }
451 #endif /* IPv6 */
452         default:
453                 ret_val = -EINVAL;
454         }
455         if (ret_val == 0)
456                 atomic_inc(&netlabel_mgmt_protocount);
457 
458 unlhsh_add_return:
459         rcu_read_unlock();
460         if (audit_buf != NULL) {
461                 if (security_secid_to_secctx(secid,
462                                              &secctx,
463                                              &secctx_len) == 0) {
464                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
465                         security_release_secctx(secctx, secctx_len);
466                 }
467                 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
468                 audit_log_end(audit_buf);
469         }
470         return ret_val;
471 }
472 
473 /**
474  * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
475  * @net: network namespace
476  * @iface: interface entry
477  * @addr: IP address
478  * @mask: IP address mask
479  * @audit_info: NetLabel audit information
480  *
481  * Description:
482  * Remove an IP address entry from the unlabeled connection hash table.
483  * Returns zero on success, negative values on failure.
484  *
485  */
486 static int netlbl_unlhsh_remove_addr4(struct net *net,
487                                       struct netlbl_unlhsh_iface *iface,
488                                       const struct in_addr *addr,
489                                       const struct in_addr *mask,
490                                       struct netlbl_audit *audit_info)
491 {
492         struct netlbl_af4list *list_entry;
493         struct netlbl_unlhsh_addr4 *entry;
494         struct audit_buffer *audit_buf;
495         struct net_device *dev;
496         char *secctx;
497         u32 secctx_len;
498 
499         spin_lock(&netlbl_unlhsh_lock);
500         list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
501                                            &iface->addr4_list);
502         spin_unlock(&netlbl_unlhsh_lock);
503         if (list_entry != NULL)
504                 entry = netlbl_unlhsh_addr4_entry(list_entry);
505         else
506                 entry = NULL;
507 
508         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
509                                               audit_info);
510         if (audit_buf != NULL) {
511                 dev = dev_get_by_index(net, iface->ifindex);
512                 netlbl_af4list_audit_addr(audit_buf, 1,
513                                           (dev != NULL ? dev->name : NULL),
514                                           addr->s_addr, mask->s_addr);
515                 if (dev != NULL)
516                         dev_put(dev);
517                 if (entry != NULL &&
518                     security_secid_to_secctx(entry->secid,
519                                              &secctx, &secctx_len) == 0) {
520                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
521                         security_release_secctx(secctx, secctx_len);
522                 }
523                 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
524                 audit_log_end(audit_buf);
525         }
526 
527         if (entry == NULL)
528                 return -ENOENT;
529 
530         kfree_rcu(entry, rcu);
531         return 0;
532 }
533 
534 #if IS_ENABLED(CONFIG_IPV6)
535 /**
536  * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
537  * @net: network namespace
538  * @iface: interface entry
539  * @addr: IP address
540  * @mask: IP address mask
541  * @audit_info: NetLabel audit information
542  *
543  * Description:
544  * Remove an IP address entry from the unlabeled connection hash table.
545  * Returns zero on success, negative values on failure.
546  *
547  */
548 static int netlbl_unlhsh_remove_addr6(struct net *net,
549                                       struct netlbl_unlhsh_iface *iface,
550                                       const struct in6_addr *addr,
551                                       const struct in6_addr *mask,
552                                       struct netlbl_audit *audit_info)
553 {
554         struct netlbl_af6list *list_entry;
555         struct netlbl_unlhsh_addr6 *entry;
556         struct audit_buffer *audit_buf;
557         struct net_device *dev;
558         char *secctx;
559         u32 secctx_len;
560 
561         spin_lock(&netlbl_unlhsh_lock);
562         list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
563         spin_unlock(&netlbl_unlhsh_lock);
564         if (list_entry != NULL)
565                 entry = netlbl_unlhsh_addr6_entry(list_entry);
566         else
567                 entry = NULL;
568 
569         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
570                                               audit_info);
571         if (audit_buf != NULL) {
572                 dev = dev_get_by_index(net, iface->ifindex);
573                 netlbl_af6list_audit_addr(audit_buf, 1,
574                                           (dev != NULL ? dev->name : NULL),
575                                           addr, mask);
576                 if (dev != NULL)
577                         dev_put(dev);
578                 if (entry != NULL &&
579                     security_secid_to_secctx(entry->secid,
580                                              &secctx, &secctx_len) == 0) {
581                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
582                         security_release_secctx(secctx, secctx_len);
583                 }
584                 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
585                 audit_log_end(audit_buf);
586         }
587 
588         if (entry == NULL)
589                 return -ENOENT;
590 
591         kfree_rcu(entry, rcu);
592         return 0;
593 }
594 #endif /* IPv6 */
595 
596 /**
597  * netlbl_unlhsh_condremove_iface - Remove an interface entry
598  * @iface: the interface entry
599  *
600  * Description:
601  * Remove an interface entry from the unlabeled connection hash table if it is
602  * empty.  An interface entry is considered to be empty if there are no
603  * address entries assigned to it.
604  *
605  */
606 static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
607 {
608         struct netlbl_af4list *iter4;
609 #if IS_ENABLED(CONFIG_IPV6)
610         struct netlbl_af6list *iter6;
611 #endif /* IPv6 */
612 
613         spin_lock(&netlbl_unlhsh_lock);
614         netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
615                 goto unlhsh_condremove_failure;
616 #if IS_ENABLED(CONFIG_IPV6)
617         netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
618                 goto unlhsh_condremove_failure;
619 #endif /* IPv6 */
620         iface->valid = 0;
621         if (iface->ifindex > 0)
622                 list_del_rcu(&iface->list);
623         else
624                 RCU_INIT_POINTER(netlbl_unlhsh_def, NULL);
625         spin_unlock(&netlbl_unlhsh_lock);
626 
627         call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
628         return;
629 
630 unlhsh_condremove_failure:
631         spin_unlock(&netlbl_unlhsh_lock);
632 }
633 
634 /**
635  * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
636  * @net: network namespace
637  * @dev_name: interface name
638  * @addr: IP address in network byte order
639  * @mask: address mask in network byte order
640  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
641  * @audit_info: NetLabel audit information
642  *
643  * Description:
644  * Removes and existing entry from the unlabeled connection hash table.
645  * Returns zero on success, negative values on failure.
646  *
647  */
648 int netlbl_unlhsh_remove(struct net *net,
649                          const char *dev_name,
650                          const void *addr,
651                          const void *mask,
652                          u32 addr_len,
653                          struct netlbl_audit *audit_info)
654 {
655         int ret_val;
656         struct net_device *dev;
657         struct netlbl_unlhsh_iface *iface;
658 
659         if (addr_len != sizeof(struct in_addr) &&
660             addr_len != sizeof(struct in6_addr))
661                 return -EINVAL;
662 
663         rcu_read_lock();
664         if (dev_name != NULL) {
665                 dev = dev_get_by_name_rcu(net, dev_name);
666                 if (dev == NULL) {
667                         ret_val = -ENODEV;
668                         goto unlhsh_remove_return;
669                 }
670                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
671         } else
672                 iface = rcu_dereference(netlbl_unlhsh_def);
673         if (iface == NULL) {
674                 ret_val = -ENOENT;
675                 goto unlhsh_remove_return;
676         }
677         switch (addr_len) {
678         case sizeof(struct in_addr):
679                 ret_val = netlbl_unlhsh_remove_addr4(net,
680                                                      iface, addr, mask,
681                                                      audit_info);
682                 break;
683 #if IS_ENABLED(CONFIG_IPV6)
684         case sizeof(struct in6_addr):
685                 ret_val = netlbl_unlhsh_remove_addr6(net,
686                                                      iface, addr, mask,
687                                                      audit_info);
688                 break;
689 #endif /* IPv6 */
690         default:
691                 ret_val = -EINVAL;
692         }
693         if (ret_val == 0) {
694                 netlbl_unlhsh_condremove_iface(iface);
695                 atomic_dec(&netlabel_mgmt_protocount);
696         }
697 
698 unlhsh_remove_return:
699         rcu_read_unlock();
700         return ret_val;
701 }
702 
703 /*
704  * General Helper Functions
705  */
706 
707 /**
708  * netlbl_unlhsh_netdev_handler - Network device notification handler
709  * @this: notifier block
710  * @event: the event
711  * @ptr: the network device (cast to void)
712  *
713  * Description:
714  * Handle network device events, although at present all we care about is a
715  * network device going away.  In the case of a device going away we clear any
716  * related entries from the unlabeled connection hash table.
717  *
718  */
719 static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
720                                         unsigned long event,
721                                         void *ptr)
722 {
723         struct net_device *dev = ptr;
724         struct netlbl_unlhsh_iface *iface = NULL;
725 
726         if (!net_eq(dev_net(dev), &init_net))
727                 return NOTIFY_DONE;
728 
729         /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
730         if (event == NETDEV_DOWN) {
731                 spin_lock(&netlbl_unlhsh_lock);
732                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
733                 if (iface != NULL && iface->valid) {
734                         iface->valid = 0;
735                         list_del_rcu(&iface->list);
736                 } else
737                         iface = NULL;
738                 spin_unlock(&netlbl_unlhsh_lock);
739         }
740 
741         if (iface != NULL)
742                 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
743 
744         return NOTIFY_DONE;
745 }
746 
747 /**
748  * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
749  * @value: desired value
750  * @audit_info: NetLabel audit information
751  *
752  * Description:
753  * Set the value of the unlabeled accept flag to @value.
754  *
755  */
756 static void netlbl_unlabel_acceptflg_set(u8 value,
757                                          struct netlbl_audit *audit_info)
758 {
759         struct audit_buffer *audit_buf;
760         u8 old_val;
761 
762         old_val = netlabel_unlabel_acceptflg;
763         netlabel_unlabel_acceptflg = value;
764         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
765                                               audit_info);
766         if (audit_buf != NULL) {
767                 audit_log_format(audit_buf,
768                                  " unlbl_accept=%u old=%u", value, old_val);
769                 audit_log_end(audit_buf);
770         }
771 }
772 
773 /**
774  * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
775  * @info: the Generic NETLINK info block
776  * @addr: the IP address
777  * @mask: the IP address mask
778  * @len: the address length
779  *
780  * Description:
781  * Examine the Generic NETLINK message and extract the IP address information.
782  * Returns zero on success, negative values on failure.
783  *
784  */
785 static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
786                                        void **addr,
787                                        void **mask,
788                                        u32 *len)
789 {
790         u32 addr_len;
791 
792         if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
793                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
794                 if (addr_len != sizeof(struct in_addr) &&
795                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
796                         return -EINVAL;
797                 *len = addr_len;
798                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
799                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
800                 return 0;
801         } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
802                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
803                 if (addr_len != sizeof(struct in6_addr) &&
804                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
805                         return -EINVAL;
806                 *len = addr_len;
807                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
808                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
809                 return 0;
810         }
811 
812         return -EINVAL;
813 }
814 
815 /*
816  * NetLabel Command Handlers
817  */
818 
819 /**
820  * netlbl_unlabel_accept - Handle an ACCEPT message
821  * @skb: the NETLINK buffer
822  * @info: the Generic NETLINK info block
823  *
824  * Description:
825  * Process a user generated ACCEPT message and set the accept flag accordingly.
826  * Returns zero on success, negative values on failure.
827  *
828  */
829 static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
830 {
831         u8 value;
832         struct netlbl_audit audit_info;
833 
834         if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
835                 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
836                 if (value == 1 || value == 0) {
837                         netlbl_netlink_auditinfo(skb, &audit_info);
838                         netlbl_unlabel_acceptflg_set(value, &audit_info);
839                         return 0;
840                 }
841         }
842 
843         return -EINVAL;
844 }
845 
846 /**
847  * netlbl_unlabel_list - Handle a LIST message
848  * @skb: the NETLINK buffer
849  * @info: the Generic NETLINK info block
850  *
851  * Description:
852  * Process a user generated LIST message and respond with the current status.
853  * Returns zero on success, negative values on failure.
854  *
855  */
856 static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
857 {
858         int ret_val = -EINVAL;
859         struct sk_buff *ans_skb;
860         void *data;
861 
862         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
863         if (ans_skb == NULL)
864                 goto list_failure;
865         data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
866                                  0, NLBL_UNLABEL_C_LIST);
867         if (data == NULL) {
868                 ret_val = -ENOMEM;
869                 goto list_failure;
870         }
871 
872         ret_val = nla_put_u8(ans_skb,
873                              NLBL_UNLABEL_A_ACPTFLG,
874                              netlabel_unlabel_acceptflg);
875         if (ret_val != 0)
876                 goto list_failure;
877 
878         genlmsg_end(ans_skb, data);
879         return genlmsg_reply(ans_skb, info);
880 
881 list_failure:
882         kfree_skb(ans_skb);
883         return ret_val;
884 }
885 
886 /**
887  * netlbl_unlabel_staticadd - Handle a STATICADD message
888  * @skb: the NETLINK buffer
889  * @info: the Generic NETLINK info block
890  *
891  * Description:
892  * Process a user generated STATICADD message and add a new unlabeled
893  * connection entry to the hash table.  Returns zero on success, negative
894  * values on failure.
895  *
896  */
897 static int netlbl_unlabel_staticadd(struct sk_buff *skb,
898                                     struct genl_info *info)
899 {
900         int ret_val;
901         char *dev_name;
902         void *addr;
903         void *mask;
904         u32 addr_len;
905         u32 secid;
906         struct netlbl_audit audit_info;
907 
908         /* Don't allow users to add both IPv4 and IPv6 addresses for a
909          * single entry.  However, allow users to create two entries, one each
910          * for IPv4 and IPv4, with the same LSM security context which should
911          * achieve the same result. */
912         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
913             !info->attrs[NLBL_UNLABEL_A_IFACE] ||
914             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
915                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
916               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
917                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
918                 return -EINVAL;
919 
920         netlbl_netlink_auditinfo(skb, &audit_info);
921 
922         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
923         if (ret_val != 0)
924                 return ret_val;
925         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
926         ret_val = security_secctx_to_secid(
927                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
928                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
929                                   &secid);
930         if (ret_val != 0)
931                 return ret_val;
932 
933         return netlbl_unlhsh_add(&init_net,
934                                  dev_name, addr, mask, addr_len, secid,
935                                  &audit_info);
936 }
937 
938 /**
939  * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
940  * @skb: the NETLINK buffer
941  * @info: the Generic NETLINK info block
942  *
943  * Description:
944  * Process a user generated STATICADDDEF message and add a new default
945  * unlabeled connection entry.  Returns zero on success, negative values on
946  * failure.
947  *
948  */
949 static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
950                                        struct genl_info *info)
951 {
952         int ret_val;
953         void *addr;
954         void *mask;
955         u32 addr_len;
956         u32 secid;
957         struct netlbl_audit audit_info;
958 
959         /* Don't allow users to add both IPv4 and IPv6 addresses for a
960          * single entry.  However, allow users to create two entries, one each
961          * for IPv4 and IPv6, with the same LSM security context which should
962          * achieve the same result. */
963         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
964             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
965                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
966               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
967                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
968                 return -EINVAL;
969 
970         netlbl_netlink_auditinfo(skb, &audit_info);
971 
972         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
973         if (ret_val != 0)
974                 return ret_val;
975         ret_val = security_secctx_to_secid(
976                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
977                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
978                                   &secid);
979         if (ret_val != 0)
980                 return ret_val;
981 
982         return netlbl_unlhsh_add(&init_net,
983                                  NULL, addr, mask, addr_len, secid,
984                                  &audit_info);
985 }
986 
987 /**
988  * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
989  * @skb: the NETLINK buffer
990  * @info: the Generic NETLINK info block
991  *
992  * Description:
993  * Process a user generated STATICREMOVE message and remove the specified
994  * unlabeled connection entry.  Returns zero on success, negative values on
995  * failure.
996  *
997  */
998 static int netlbl_unlabel_staticremove(struct sk_buff *skb,
999                                        struct genl_info *info)
1000 {
1001         int ret_val;
1002         char *dev_name;
1003         void *addr;
1004         void *mask;
1005         u32 addr_len;
1006         struct netlbl_audit audit_info;
1007 
1008         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1009          * IPv4 and IPv6 in the same entry. */
1010         if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
1011             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1012                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1013               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1014                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1015                 return -EINVAL;
1016 
1017         netlbl_netlink_auditinfo(skb, &audit_info);
1018 
1019         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1020         if (ret_val != 0)
1021                 return ret_val;
1022         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1023 
1024         return netlbl_unlhsh_remove(&init_net,
1025                                     dev_name, addr, mask, addr_len,
1026                                     &audit_info);
1027 }
1028 
1029 /**
1030  * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1031  * @skb: the NETLINK buffer
1032  * @info: the Generic NETLINK info block
1033  *
1034  * Description:
1035  * Process a user generated STATICREMOVEDEF message and remove the default
1036  * unlabeled connection entry.  Returns zero on success, negative values on
1037  * failure.
1038  *
1039  */
1040 static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1041                                           struct genl_info *info)
1042 {
1043         int ret_val;
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_IPV4ADDR] ||
1052                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1053               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1054                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1055                 return -EINVAL;
1056 
1057         netlbl_netlink_auditinfo(skb, &audit_info);
1058 
1059         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1060         if (ret_val != 0)
1061                 return ret_val;
1062 
1063         return netlbl_unlhsh_remove(&init_net,
1064                                     NULL, addr, mask, addr_len,
1065                                     &audit_info);
1066 }
1067 
1068 
1069 /**
1070  * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1071  * @cmd: command/message
1072  * @iface: the interface entry
1073  * @addr4: the IPv4 address entry
1074  * @addr6: the IPv6 address entry
1075  * @arg: the netlbl_unlhsh_walk_arg structure
1076  *
1077  * Description:
1078  * This function is designed to be used to generate a response for a
1079  * STATICLIST or STATICLISTDEF message.  When called either @addr4 or @addr6
1080  * can be specified, not both, the other unspecified entry should be set to
1081  * NULL by the caller.  Returns the size of the message on success, negative
1082  * values on failure.
1083  *
1084  */
1085 static int netlbl_unlabel_staticlist_gen(u32 cmd,
1086                                        const struct netlbl_unlhsh_iface *iface,
1087                                        const struct netlbl_unlhsh_addr4 *addr4,
1088                                        const struct netlbl_unlhsh_addr6 *addr6,
1089                                        void *arg)
1090 {
1091         int ret_val = -ENOMEM;
1092         struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1093         struct net_device *dev;
1094         void *data;
1095         u32 secid;
1096         char *secctx;
1097         u32 secctx_len;
1098 
1099         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
1100                            cb_arg->seq, &netlbl_unlabel_gnl_family,
1101                            NLM_F_MULTI, cmd);
1102         if (data == NULL)
1103                 goto list_cb_failure;
1104 
1105         if (iface->ifindex > 0) {
1106                 dev = dev_get_by_index(&init_net, iface->ifindex);
1107                 if (!dev) {
1108                         ret_val = -ENODEV;
1109                         goto list_cb_failure;
1110                 }
1111                 ret_val = nla_put_string(cb_arg->skb,
1112                                          NLBL_UNLABEL_A_IFACE, dev->name);
1113                 dev_put(dev);
1114                 if (ret_val != 0)
1115                         goto list_cb_failure;
1116         }
1117 
1118         if (addr4) {
1119                 struct in_addr addr_struct;
1120 
1121                 addr_struct.s_addr = addr4->list.addr;
1122                 ret_val = nla_put(cb_arg->skb,
1123                                   NLBL_UNLABEL_A_IPV4ADDR,
1124                                   sizeof(struct in_addr),
1125                                   &addr_struct);
1126                 if (ret_val != 0)
1127                         goto list_cb_failure;
1128 
1129                 addr_struct.s_addr = addr4->list.mask;
1130                 ret_val = nla_put(cb_arg->skb,
1131                                   NLBL_UNLABEL_A_IPV4MASK,
1132                                   sizeof(struct in_addr),
1133                                   &addr_struct);
1134                 if (ret_val != 0)
1135                         goto list_cb_failure;
1136 
1137                 secid = addr4->secid;
1138         } else {
1139                 ret_val = nla_put(cb_arg->skb,
1140                                   NLBL_UNLABEL_A_IPV6ADDR,
1141                                   sizeof(struct in6_addr),
1142                                   &addr6->list.addr);
1143                 if (ret_val != 0)
1144                         goto list_cb_failure;
1145 
1146                 ret_val = nla_put(cb_arg->skb,
1147                                   NLBL_UNLABEL_A_IPV6MASK,
1148                                   sizeof(struct in6_addr),
1149                                   &addr6->list.mask);
1150                 if (ret_val != 0)
1151                         goto list_cb_failure;
1152 
1153                 secid = addr6->secid;
1154         }
1155 
1156         ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
1157         if (ret_val != 0)
1158                 goto list_cb_failure;
1159         ret_val = nla_put(cb_arg->skb,
1160                           NLBL_UNLABEL_A_SECCTX,
1161                           secctx_len,
1162                           secctx);
1163         security_release_secctx(secctx, secctx_len);
1164         if (ret_val != 0)
1165                 goto list_cb_failure;
1166 
1167         cb_arg->seq++;
1168         return genlmsg_end(cb_arg->skb, data);
1169 
1170 list_cb_failure:
1171         genlmsg_cancel(cb_arg->skb, data);
1172         return ret_val;
1173 }
1174 
1175 /**
1176  * netlbl_unlabel_staticlist - Handle a STATICLIST message
1177  * @skb: the NETLINK buffer
1178  * @cb: the NETLINK callback
1179  *
1180  * Description:
1181  * Process a user generated STATICLIST message and dump the unlabeled
1182  * connection hash table in a form suitable for use in a kernel generated
1183  * STATICLIST message.  Returns the length of @skb.
1184  *
1185  */
1186 static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1187                                      struct netlink_callback *cb)
1188 {
1189         struct netlbl_unlhsh_walk_arg cb_arg;
1190         u32 skip_bkt = cb->args[0];
1191         u32 skip_chain = cb->args[1];
1192         u32 iter_bkt;
1193         u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1194         struct netlbl_unlhsh_iface *iface;
1195         struct list_head *iter_list;
1196         struct netlbl_af4list *addr4;
1197 #if IS_ENABLED(CONFIG_IPV6)
1198         struct netlbl_af6list *addr6;
1199 #endif
1200 
1201         cb_arg.nl_cb = cb;
1202         cb_arg.skb = skb;
1203         cb_arg.seq = cb->nlh->nlmsg_seq;
1204 
1205         rcu_read_lock();
1206         for (iter_bkt = skip_bkt;
1207              iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1208              iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
1209                 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
1210                 list_for_each_entry_rcu(iface, iter_list, list) {
1211                         if (!iface->valid ||
1212                             iter_chain++ < skip_chain)
1213                                 continue;
1214                         netlbl_af4list_foreach_rcu(addr4,
1215                                                    &iface->addr4_list) {
1216                                 if (iter_addr4++ < cb->args[2])
1217                                         continue;
1218                                 if (netlbl_unlabel_staticlist_gen(
1219                                               NLBL_UNLABEL_C_STATICLIST,
1220                                               iface,
1221                                               netlbl_unlhsh_addr4_entry(addr4),
1222                                               NULL,
1223                                               &cb_arg) < 0) {
1224                                         iter_addr4--;
1225                                         iter_chain--;
1226                                         goto unlabel_staticlist_return;
1227                                 }
1228                         }
1229 #if IS_ENABLED(CONFIG_IPV6)
1230                         netlbl_af6list_foreach_rcu(addr6,
1231                                                    &iface->addr6_list) {
1232                                 if (iter_addr6++ < cb->args[3])
1233                                         continue;
1234                                 if (netlbl_unlabel_staticlist_gen(
1235                                               NLBL_UNLABEL_C_STATICLIST,
1236                                               iface,
1237                                               NULL,
1238                                               netlbl_unlhsh_addr6_entry(addr6),
1239                                               &cb_arg) < 0) {
1240                                         iter_addr6--;
1241                                         iter_chain--;
1242                                         goto unlabel_staticlist_return;
1243                                 }
1244                         }
1245 #endif /* IPv6 */
1246                 }
1247         }
1248 
1249 unlabel_staticlist_return:
1250         rcu_read_unlock();
1251         cb->args[0] = iter_bkt;
1252         cb->args[1] = iter_chain;
1253         cb->args[2] = iter_addr4;
1254         cb->args[3] = iter_addr6;
1255         return skb->len;
1256 }
1257 
1258 /**
1259  * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1260  * @skb: the NETLINK buffer
1261  * @cb: the NETLINK callback
1262  *
1263  * Description:
1264  * Process a user generated STATICLISTDEF message and dump the default
1265  * unlabeled connection entry in a form suitable for use in a kernel generated
1266  * STATICLISTDEF message.  Returns the length of @skb.
1267  *
1268  */
1269 static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1270                                         struct netlink_callback *cb)
1271 {
1272         struct netlbl_unlhsh_walk_arg cb_arg;
1273         struct netlbl_unlhsh_iface *iface;
1274         u32 iter_addr4 = 0, iter_addr6 = 0;
1275         struct netlbl_af4list *addr4;
1276 #if IS_ENABLED(CONFIG_IPV6)
1277         struct netlbl_af6list *addr6;
1278 #endif
1279 
1280         cb_arg.nl_cb = cb;
1281         cb_arg.skb = skb;
1282         cb_arg.seq = cb->nlh->nlmsg_seq;
1283 
1284         rcu_read_lock();
1285         iface = rcu_dereference(netlbl_unlhsh_def);
1286         if (iface == NULL || !iface->valid)
1287                 goto unlabel_staticlistdef_return;
1288 
1289         netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
1290                 if (iter_addr4++ < cb->args[0])
1291                         continue;
1292                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1293                                               iface,
1294                                               netlbl_unlhsh_addr4_entry(addr4),
1295                                               NULL,
1296                                               &cb_arg) < 0) {
1297                         iter_addr4--;
1298                         goto unlabel_staticlistdef_return;
1299                 }
1300         }
1301 #if IS_ENABLED(CONFIG_IPV6)
1302         netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
1303                 if (iter_addr6++ < cb->args[1])
1304                         continue;
1305                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1306                                               iface,
1307                                               NULL,
1308                                               netlbl_unlhsh_addr6_entry(addr6),
1309                                               &cb_arg) < 0) {
1310                         iter_addr6--;
1311                         goto unlabel_staticlistdef_return;
1312                 }
1313         }
1314 #endif /* IPv6 */
1315 
1316 unlabel_staticlistdef_return:
1317         rcu_read_unlock();
1318         cb->args[0] = iter_addr4;
1319         cb->args[1] = iter_addr6;
1320         return skb->len;
1321 }
1322 
1323 /*
1324  * NetLabel Generic NETLINK Command Definitions
1325  */
1326 
1327 static struct genl_ops netlbl_unlabel_genl_ops[] = {
1328         {
1329         .cmd = NLBL_UNLABEL_C_STATICADD,
1330         .flags = GENL_ADMIN_PERM,
1331         .policy = netlbl_unlabel_genl_policy,
1332         .doit = netlbl_unlabel_staticadd,
1333         .dumpit = NULL,
1334         },
1335         {
1336         .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1337         .flags = GENL_ADMIN_PERM,
1338         .policy = netlbl_unlabel_genl_policy,
1339         .doit = netlbl_unlabel_staticremove,
1340         .dumpit = NULL,
1341         },
1342         {
1343         .cmd = NLBL_UNLABEL_C_STATICLIST,
1344         .flags = 0,
1345         .policy = netlbl_unlabel_genl_policy,
1346         .doit = NULL,
1347         .dumpit = netlbl_unlabel_staticlist,
1348         },
1349         {
1350         .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1351         .flags = GENL_ADMIN_PERM,
1352         .policy = netlbl_unlabel_genl_policy,
1353         .doit = netlbl_unlabel_staticadddef,
1354         .dumpit = NULL,
1355         },
1356         {
1357         .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1358         .flags = GENL_ADMIN_PERM,
1359         .policy = netlbl_unlabel_genl_policy,
1360         .doit = netlbl_unlabel_staticremovedef,
1361         .dumpit = NULL,
1362         },
1363         {
1364         .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1365         .flags = 0,
1366         .policy = netlbl_unlabel_genl_policy,
1367         .doit = NULL,
1368         .dumpit = netlbl_unlabel_staticlistdef,
1369         },
1370         {
1371         .cmd = NLBL_UNLABEL_C_ACCEPT,
1372         .flags = GENL_ADMIN_PERM,
1373         .policy = netlbl_unlabel_genl_policy,
1374         .doit = netlbl_unlabel_accept,
1375         .dumpit = NULL,
1376         },
1377         {
1378         .cmd = NLBL_UNLABEL_C_LIST,
1379         .flags = 0,
1380         .policy = netlbl_unlabel_genl_policy,
1381         .doit = netlbl_unlabel_list,
1382         .dumpit = NULL,
1383         },
1384 };
1385 
1386 /*
1387  * NetLabel Generic NETLINK Protocol Functions
1388  */
1389 
1390 /**
1391  * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
1392  *
1393  * Description:
1394  * Register the unlabeled packet NetLabel component with the Generic NETLINK
1395  * mechanism.  Returns zero on success, negative values on failure.
1396  *
1397  */
1398 int __init netlbl_unlabel_genl_init(void)
1399 {
1400         return genl_register_family_with_ops(&netlbl_unlabel_gnl_family,
1401                 netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops));
1402 }
1403 
1404 /*
1405  * NetLabel KAPI Hooks
1406  */
1407 
1408 static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1409         .notifier_call = netlbl_unlhsh_netdev_handler,
1410 };
1411 
1412 /**
1413  * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1414  * @size: the number of bits to use for the hash buckets
1415  *
1416  * Description:
1417  * Initializes the unlabeled connection hash table and registers a network
1418  * device notification handler.  This function should only be called by the
1419  * NetLabel subsystem itself during initialization.  Returns zero on success,
1420  * non-zero values on error.
1421  *
1422  */
1423 int __init netlbl_unlabel_init(u32 size)
1424 {
1425         u32 iter;
1426         struct netlbl_unlhsh_tbl *hsh_tbl;
1427 
1428         if (size == 0)
1429                 return -EINVAL;
1430 
1431         hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1432         if (hsh_tbl == NULL)
1433                 return -ENOMEM;
1434         hsh_tbl->size = 1 << size;
1435         hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1436                                sizeof(struct list_head),
1437                                GFP_KERNEL);
1438         if (hsh_tbl->tbl == NULL) {
1439                 kfree(hsh_tbl);
1440                 return -ENOMEM;
1441         }
1442         for (iter = 0; iter < hsh_tbl->size; iter++)
1443                 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
1444 
1445         spin_lock(&netlbl_unlhsh_lock);
1446         rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1447         spin_unlock(&netlbl_unlhsh_lock);
1448 
1449         register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
1450 
1451         return 0;
1452 }
1453 
1454 /**
1455  * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1456  * @skb: the packet
1457  * @family: protocol family
1458  * @secattr: the security attributes
1459  *
1460  * Description:
1461  * Determine the security attributes, if any, for an unlabled packet and return
1462  * them in @secattr.  Returns zero on success and negative values on failure.
1463  *
1464  */
1465 int netlbl_unlabel_getattr(const struct sk_buff *skb,
1466                            u16 family,
1467                            struct netlbl_lsm_secattr *secattr)
1468 {
1469         struct netlbl_unlhsh_iface *iface;
1470 
1471         rcu_read_lock();
1472         iface = netlbl_unlhsh_search_iface(skb->skb_iif);
1473         if (iface == NULL)
1474                 iface = rcu_dereference(netlbl_unlhsh_def);
1475         if (iface == NULL || !iface->valid)
1476                 goto unlabel_getattr_nolabel;
1477         switch (family) {
1478         case PF_INET: {
1479                 struct iphdr *hdr4;
1480                 struct netlbl_af4list *addr4;
1481 
1482                 hdr4 = ip_hdr(skb);
1483                 addr4 = netlbl_af4list_search(hdr4->saddr,
1484                                               &iface->addr4_list);
1485                 if (addr4 == NULL)
1486                         goto unlabel_getattr_nolabel;
1487                 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
1488                 break;
1489         }
1490 #if IS_ENABLED(CONFIG_IPV6)
1491         case PF_INET6: {
1492                 struct ipv6hdr *hdr6;
1493                 struct netlbl_af6list *addr6;
1494 
1495                 hdr6 = ipv6_hdr(skb);
1496                 addr6 = netlbl_af6list_search(&hdr6->saddr,
1497                                               &iface->addr6_list);
1498                 if (addr6 == NULL)
1499                         goto unlabel_getattr_nolabel;
1500                 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
1501                 break;
1502         }
1503 #endif /* IPv6 */
1504         default:
1505                 goto unlabel_getattr_nolabel;
1506         }
1507         rcu_read_unlock();
1508 
1509         secattr->flags |= NETLBL_SECATTR_SECID;
1510         secattr->type = NETLBL_NLTYPE_UNLABELED;
1511         return 0;
1512 
1513 unlabel_getattr_nolabel:
1514         rcu_read_unlock();
1515         if (netlabel_unlabel_acceptflg == 0)
1516                 return -ENOMSG;
1517         secattr->type = NETLBL_NLTYPE_UNLABELED;
1518         return 0;
1519 }
1520 
1521 /**
1522  * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
1523  *
1524  * Description:
1525  * Set the default NetLabel configuration to allow incoming unlabeled packets
1526  * and to send unlabeled network traffic by default.
1527  *
1528  */
1529 int __init netlbl_unlabel_defconf(void)
1530 {
1531         int ret_val;
1532         struct netlbl_dom_map *entry;
1533         struct netlbl_audit audit_info;
1534 
1535         /* Only the kernel is allowed to call this function and the only time
1536          * it is called is at bootup before the audit subsystem is reporting
1537          * messages so don't worry to much about these values. */
1538         security_task_getsecid(current, &audit_info.secid);
1539         audit_info.loginuid = GLOBAL_ROOT_UID;
1540         audit_info.sessionid = 0;
1541 
1542         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1543         if (entry == NULL)
1544                 return -ENOMEM;
1545         entry->type = NETLBL_NLTYPE_UNLABELED;
1546         ret_val = netlbl_domhsh_add_default(entry, &audit_info);
1547         if (ret_val != 0)
1548                 return ret_val;
1549 
1550         netlbl_unlabel_acceptflg_set(1, &audit_info);
1551 
1552         return 0;
1553 }
1554 

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