netlabel: Fix several rcu_dereference() calls used without RCU read locks
[linux-2.6.git] / net / netlabel / netlabel_unlabeled.c
1 /*
2  * NetLabel Unlabeled Support
3  *
4  * This file defines functions for dealing with unlabeled packets for the
5  * NetLabel system.  The NetLabel system manages static and dynamic label
6  * mappings for network protocols such as CIPSO and RIPSO.
7  *
8  * Author: Paul Moore <paul.moore@hp.com>
9  *
10  */
11
12 /*
13  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008
14  *
15  * This program is free software;  you can redistribute it and/or modify
16  * it under the terms of the GNU General Public License as published by
17  * the Free Software Foundation; either version 2 of the License, or
18  * (at your option) any later version.
19  *
20  * This program is distributed in the hope that it will be useful,
21  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
23  * the GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with this program;  if not, write to the Free Software
27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28  *
29  */
30
31 #include <linux/types.h>
32 #include <linux/rcupdate.h>
33 #include <linux/list.h>
34 #include <linux/spinlock.h>
35 #include <linux/socket.h>
36 #include <linux/string.h>
37 #include <linux/skbuff.h>
38 #include <linux/audit.h>
39 #include <linux/in.h>
40 #include <linux/in6.h>
41 #include <linux/ip.h>
42 #include <linux/ipv6.h>
43 #include <linux/notifier.h>
44 #include <linux/netdevice.h>
45 #include <linux/security.h>
46 #include <net/sock.h>
47 #include <net/netlink.h>
48 #include <net/genetlink.h>
49 #include <net/ip.h>
50 #include <net/ipv6.h>
51 #include <net/net_namespace.h>
52 #include <net/netlabel.h>
53 #include <asm/bug.h>
54 #include <asm/atomic.h>
55
56 #include "netlabel_user.h"
57 #include "netlabel_addrlist.h"
58 #include "netlabel_domainhash.h"
59 #include "netlabel_unlabeled.h"
60 #include "netlabel_mgmt.h"
61
62 /* NOTE: at present we always use init's network namespace since we don't
63  *       presently support different namespaces even though the majority of
64  *       the functions in this file are "namespace safe" */
65
66 /* The unlabeled connection hash table which we use to map network interfaces
67  * and addresses of unlabeled packets to a user specified secid value for the
68  * LSM.  The hash table is used to lookup the network interface entry
69  * (struct netlbl_unlhsh_iface) and then the interface entry is used to
70  * lookup an IP address match from an ordered list.  If a network interface
71  * match can not be found in the hash table then the default entry
72  * (netlbl_unlhsh_def) is used.  The IP address entry list
73  * (struct netlbl_unlhsh_addr) is ordered such that the entries with a
74  * larger netmask come first.
75  */
76 struct netlbl_unlhsh_tbl {
77         struct list_head *tbl;
78         u32 size;
79 };
80 #define netlbl_unlhsh_addr4_entry(iter) \
81         container_of(iter, struct netlbl_unlhsh_addr4, list)
82 struct netlbl_unlhsh_addr4 {
83         u32 secid;
84
85         struct netlbl_af4list list;
86         struct rcu_head rcu;
87 };
88 #define netlbl_unlhsh_addr6_entry(iter) \
89         container_of(iter, struct netlbl_unlhsh_addr6, list)
90 struct netlbl_unlhsh_addr6 {
91         u32 secid;
92
93         struct netlbl_af6list list;
94         struct rcu_head rcu;
95 };
96 struct netlbl_unlhsh_iface {
97         int ifindex;
98         struct list_head addr4_list;
99         struct list_head addr6_list;
100
101         u32 valid;
102         struct list_head list;
103         struct rcu_head rcu;
104 };
105
106 /* Argument struct for netlbl_unlhsh_walk() */
107 struct netlbl_unlhsh_walk_arg {
108         struct netlink_callback *nl_cb;
109         struct sk_buff *skb;
110         u32 seq;
111 };
112
113 /* Unlabeled connection hash table */
114 /* updates should be so rare that having one spinlock for the entire
115  * hash table should be okay */
116 static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
117 #define netlbl_unlhsh_rcu_deref(p) \
118         rcu_dereference_check(p, rcu_read_lock_held() || \
119                                  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_addr4 - Frees an IPv4 address 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 address entry can be
162  * released safely.
163  *
164  */
165 static void netlbl_unlhsh_free_addr4(struct rcu_head *entry)
166 {
167         struct netlbl_unlhsh_addr4 *ptr;
168
169         ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu);
170         kfree(ptr);
171 }
172
173 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
174 /**
175  * netlbl_unlhsh_free_addr6 - Frees an IPv6 address entry from the hash table
176  * @entry: the entry's RCU field
177  *
178  * Description:
179  * This function is designed to be used as a callback to the call_rcu()
180  * function so that memory allocated to a hash table address entry can be
181  * released safely.
182  *
183  */
184 static void netlbl_unlhsh_free_addr6(struct rcu_head *entry)
185 {
186         struct netlbl_unlhsh_addr6 *ptr;
187
188         ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu);
189         kfree(ptr);
190 }
191 #endif /* IPv6 */
192
193 /**
194  * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
195  * @entry: the entry's RCU field
196  *
197  * Description:
198  * This function is designed to be used as a callback to the call_rcu()
199  * function so that memory allocated to a hash table interface entry can be
200  * released safely.  It is important to note that this function does not free
201  * the IPv4 and IPv6 address lists contained as part of an interface entry.  It
202  * is up to the rest of the code to make sure an interface entry is only freed
203  * once it's address lists are empty.
204  *
205  */
206 static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
207 {
208         struct netlbl_unlhsh_iface *iface;
209         struct netlbl_af4list *iter4;
210         struct netlbl_af4list *tmp4;
211 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
212         struct netlbl_af6list *iter6;
213         struct netlbl_af6list *tmp6;
214 #endif /* IPv6 */
215
216         iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
217
218         /* no need for locks here since we are the only one with access to this
219          * structure */
220
221         netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
222                 netlbl_af4list_remove_entry(iter4);
223                 kfree(netlbl_unlhsh_addr4_entry(iter4));
224         }
225 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
226         netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
227                 netlbl_af6list_remove_entry(iter6);
228                 kfree(netlbl_unlhsh_addr6_entry(iter6));
229         }
230 #endif /* IPv6 */
231         kfree(iface);
232 }
233
234 /**
235  * netlbl_unlhsh_hash - Hashing function for the hash table
236  * @ifindex: the network interface/device to hash
237  *
238  * Description:
239  * This is the hashing function for the unlabeled hash table, it returns the
240  * bucket number for the given device/interface.  The caller is responsible for
241  * ensuring that the hash table is protected with either a RCU read lock or
242  * the hash table lock.
243  *
244  */
245 static u32 netlbl_unlhsh_hash(int ifindex)
246 {
247         return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
248 }
249
250 /**
251  * netlbl_unlhsh_search_iface - Search for a matching interface entry
252  * @ifindex: the network interface
253  *
254  * Description:
255  * Searches the unlabeled connection hash table and returns a pointer to the
256  * interface entry which matches @ifindex, otherwise NULL is returned.  The
257  * caller is responsible for ensuring that the hash table is protected with
258  * either a RCU read lock or the hash table lock.
259  *
260  */
261 static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
262 {
263         u32 bkt;
264         struct list_head *bkt_list;
265         struct netlbl_unlhsh_iface *iter;
266
267         bkt = netlbl_unlhsh_hash(ifindex);
268         bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
269         list_for_each_entry_rcu(iter, bkt_list, list)
270                 if (iter->valid && iter->ifindex == ifindex)
271                         return iter;
272
273         return NULL;
274 }
275
276 /**
277  * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
278  * @iface: the associated interface entry
279  * @addr: IPv4 address in network byte order
280  * @mask: IPv4 address mask in network byte order
281  * @secid: LSM secid value for entry
282  *
283  * Description:
284  * Add a new address entry into the unlabeled connection hash table using the
285  * interface entry specified by @iface.  On success zero is returned, otherwise
286  * a negative value is returned.
287  *
288  */
289 static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
290                                    const struct in_addr *addr,
291                                    const struct in_addr *mask,
292                                    u32 secid)
293 {
294         int ret_val;
295         struct netlbl_unlhsh_addr4 *entry;
296
297         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
298         if (entry == NULL)
299                 return -ENOMEM;
300
301         entry->list.addr = addr->s_addr & mask->s_addr;
302         entry->list.mask = mask->s_addr;
303         entry->list.valid = 1;
304         entry->secid = secid;
305
306         spin_lock(&netlbl_unlhsh_lock);
307         ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
308         spin_unlock(&netlbl_unlhsh_lock);
309
310         if (ret_val != 0)
311                 kfree(entry);
312         return ret_val;
313 }
314
315 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
316 /**
317  * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
318  * @iface: the associated interface entry
319  * @addr: IPv6 address in network byte order
320  * @mask: IPv6 address mask in network byte order
321  * @secid: LSM secid value for entry
322  *
323  * Description:
324  * Add a new address entry into the unlabeled connection hash table using the
325  * interface entry specified by @iface.  On success zero is returned, otherwise
326  * a negative value is returned.
327  *
328  */
329 static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
330                                    const struct in6_addr *addr,
331                                    const struct in6_addr *mask,
332                                    u32 secid)
333 {
334         int ret_val;
335         struct netlbl_unlhsh_addr6 *entry;
336
337         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
338         if (entry == NULL)
339                 return -ENOMEM;
340
341         ipv6_addr_copy(&entry->list.addr, addr);
342         entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
343         entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
344         entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
345         entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
346         ipv6_addr_copy(&entry->list.mask, mask);
347         entry->list.valid = 1;
348         entry->secid = secid;
349
350         spin_lock(&netlbl_unlhsh_lock);
351         ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
352         spin_unlock(&netlbl_unlhsh_lock);
353
354         if (ret_val != 0)
355                 kfree(entry);
356         return 0;
357 }
358 #endif /* IPv6 */
359
360 /**
361  * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
362  * @ifindex: network interface
363  *
364  * Description:
365  * Add a new, empty, interface entry into the unlabeled connection hash table.
366  * On success a pointer to the new interface entry is returned, on failure NULL
367  * is returned.
368  *
369  */
370 static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
371 {
372         u32 bkt;
373         struct netlbl_unlhsh_iface *iface;
374
375         iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
376         if (iface == NULL)
377                 return NULL;
378
379         iface->ifindex = ifindex;
380         INIT_LIST_HEAD(&iface->addr4_list);
381         INIT_LIST_HEAD(&iface->addr6_list);
382         iface->valid = 1;
383
384         spin_lock(&netlbl_unlhsh_lock);
385         if (ifindex > 0) {
386                 bkt = netlbl_unlhsh_hash(ifindex);
387                 if (netlbl_unlhsh_search_iface(ifindex) != NULL)
388                         goto add_iface_failure;
389                 list_add_tail_rcu(&iface->list,
390                              &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
391         } else {
392                 INIT_LIST_HEAD(&iface->list);
393                 if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
394                         goto add_iface_failure;
395                 rcu_assign_pointer(netlbl_unlhsh_def, iface);
396         }
397         spin_unlock(&netlbl_unlhsh_lock);
398
399         return iface;
400
401 add_iface_failure:
402         spin_unlock(&netlbl_unlhsh_lock);
403         kfree(iface);
404         return NULL;
405 }
406
407 /**
408  * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
409  * @net: network namespace
410  * @dev_name: interface name
411  * @addr: IP address in network byte order
412  * @mask: address mask in network byte order
413  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
414  * @secid: LSM secid value for the entry
415  * @audit_info: NetLabel audit information
416  *
417  * Description:
418  * Adds a new entry to the unlabeled connection hash table.  Returns zero on
419  * success, negative values on failure.
420  *
421  */
422 int netlbl_unlhsh_add(struct net *net,
423                       const char *dev_name,
424                       const void *addr,
425                       const void *mask,
426                       u32 addr_len,
427                       u32 secid,
428                       struct netlbl_audit *audit_info)
429 {
430         int ret_val;
431         int ifindex;
432         struct net_device *dev;
433         struct netlbl_unlhsh_iface *iface;
434         struct audit_buffer *audit_buf = NULL;
435         char *secctx = NULL;
436         u32 secctx_len;
437
438         if (addr_len != sizeof(struct in_addr) &&
439             addr_len != sizeof(struct in6_addr))
440                 return -EINVAL;
441
442         rcu_read_lock();
443         if (dev_name != NULL) {
444                 dev = dev_get_by_name_rcu(net, dev_name);
445                 if (dev == NULL) {
446                         ret_val = -ENODEV;
447                         goto unlhsh_add_return;
448                 }
449                 ifindex = dev->ifindex;
450                 iface = netlbl_unlhsh_search_iface(ifindex);
451         } else {
452                 ifindex = 0;
453                 iface = rcu_dereference(netlbl_unlhsh_def);
454         }
455         if (iface == NULL) {
456                 iface = netlbl_unlhsh_add_iface(ifindex);
457                 if (iface == NULL) {
458                         ret_val = -ENOMEM;
459                         goto unlhsh_add_return;
460                 }
461         }
462         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
463                                               audit_info);
464         switch (addr_len) {
465         case sizeof(struct in_addr): {
466                 struct in_addr *addr4, *mask4;
467
468                 addr4 = (struct in_addr *)addr;
469                 mask4 = (struct in_addr *)mask;
470                 ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
471                 if (audit_buf != NULL)
472                         netlbl_af4list_audit_addr(audit_buf, 1,
473                                                   dev_name,
474                                                   addr4->s_addr,
475                                                   mask4->s_addr);
476                 break;
477         }
478 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
479         case sizeof(struct in6_addr): {
480                 struct in6_addr *addr6, *mask6;
481
482                 addr6 = (struct in6_addr *)addr;
483                 mask6 = (struct in6_addr *)mask;
484                 ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
485                 if (audit_buf != NULL)
486                         netlbl_af6list_audit_addr(audit_buf, 1,
487                                                   dev_name,
488                                                   addr6, mask6);
489                 break;
490         }
491 #endif /* IPv6 */
492         default:
493                 ret_val = -EINVAL;
494         }
495         if (ret_val == 0)
496                 atomic_inc(&netlabel_mgmt_protocount);
497
498 unlhsh_add_return:
499         rcu_read_unlock();
500         if (audit_buf != NULL) {
501                 if (security_secid_to_secctx(secid,
502                                              &secctx,
503                                              &secctx_len) == 0) {
504                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
505                         security_release_secctx(secctx, secctx_len);
506                 }
507                 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
508                 audit_log_end(audit_buf);
509         }
510         return ret_val;
511 }
512
513 /**
514  * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
515  * @net: network namespace
516  * @iface: interface entry
517  * @addr: IP address
518  * @mask: IP address mask
519  * @audit_info: NetLabel audit information
520  *
521  * Description:
522  * Remove an IP address entry from the unlabeled connection hash table.
523  * Returns zero on success, negative values on failure.
524  *
525  */
526 static int netlbl_unlhsh_remove_addr4(struct net *net,
527                                       struct netlbl_unlhsh_iface *iface,
528                                       const struct in_addr *addr,
529                                       const struct in_addr *mask,
530                                       struct netlbl_audit *audit_info)
531 {
532         struct netlbl_af4list *list_entry;
533         struct netlbl_unlhsh_addr4 *entry;
534         struct audit_buffer *audit_buf;
535         struct net_device *dev;
536         char *secctx;
537         u32 secctx_len;
538
539         spin_lock(&netlbl_unlhsh_lock);
540         list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
541                                            &iface->addr4_list);
542         spin_unlock(&netlbl_unlhsh_lock);
543         if (list_entry != NULL)
544                 entry = netlbl_unlhsh_addr4_entry(list_entry);
545         else
546                 entry = NULL;
547
548         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
549                                               audit_info);
550         if (audit_buf != NULL) {
551                 dev = dev_get_by_index(net, iface->ifindex);
552                 netlbl_af4list_audit_addr(audit_buf, 1,
553                                           (dev != NULL ? dev->name : NULL),
554                                           addr->s_addr, mask->s_addr);
555                 if (dev != NULL)
556                         dev_put(dev);
557                 if (entry != NULL &&
558                     security_secid_to_secctx(entry->secid,
559                                              &secctx, &secctx_len) == 0) {
560                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
561                         security_release_secctx(secctx, secctx_len);
562                 }
563                 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
564                 audit_log_end(audit_buf);
565         }
566
567         if (entry == NULL)
568                 return -ENOENT;
569
570         call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
571         return 0;
572 }
573
574 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
575 /**
576  * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
577  * @net: network namespace
578  * @iface: interface entry
579  * @addr: IP address
580  * @mask: IP address mask
581  * @audit_info: NetLabel audit information
582  *
583  * Description:
584  * Remove an IP address entry from the unlabeled connection hash table.
585  * Returns zero on success, negative values on failure.
586  *
587  */
588 static int netlbl_unlhsh_remove_addr6(struct net *net,
589                                       struct netlbl_unlhsh_iface *iface,
590                                       const struct in6_addr *addr,
591                                       const struct in6_addr *mask,
592                                       struct netlbl_audit *audit_info)
593 {
594         struct netlbl_af6list *list_entry;
595         struct netlbl_unlhsh_addr6 *entry;
596         struct audit_buffer *audit_buf;
597         struct net_device *dev;
598         char *secctx;
599         u32 secctx_len;
600
601         spin_lock(&netlbl_unlhsh_lock);
602         list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
603         spin_unlock(&netlbl_unlhsh_lock);
604         if (list_entry != NULL)
605                 entry = netlbl_unlhsh_addr6_entry(list_entry);
606         else
607                 entry = NULL;
608
609         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
610                                               audit_info);
611         if (audit_buf != NULL) {
612                 dev = dev_get_by_index(net, iface->ifindex);
613                 netlbl_af6list_audit_addr(audit_buf, 1,
614                                           (dev != NULL ? dev->name : NULL),
615                                           addr, mask);
616                 if (dev != NULL)
617                         dev_put(dev);
618                 if (entry != NULL &&
619                     security_secid_to_secctx(entry->secid,
620                                              &secctx, &secctx_len) == 0) {
621                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
622                         security_release_secctx(secctx, secctx_len);
623                 }
624                 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
625                 audit_log_end(audit_buf);
626         }
627
628         if (entry == NULL)
629                 return -ENOENT;
630
631         call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
632         return 0;
633 }
634 #endif /* IPv6 */
635
636 /**
637  * netlbl_unlhsh_condremove_iface - Remove an interface entry
638  * @iface: the interface entry
639  *
640  * Description:
641  * Remove an interface entry from the unlabeled connection hash table if it is
642  * empty.  An interface entry is considered to be empty if there are no
643  * address entries assigned to it.
644  *
645  */
646 static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
647 {
648         struct netlbl_af4list *iter4;
649 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
650         struct netlbl_af6list *iter6;
651 #endif /* IPv6 */
652
653         spin_lock(&netlbl_unlhsh_lock);
654         netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
655                 goto unlhsh_condremove_failure;
656 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
657         netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
658                 goto unlhsh_condremove_failure;
659 #endif /* IPv6 */
660         iface->valid = 0;
661         if (iface->ifindex > 0)
662                 list_del_rcu(&iface->list);
663         else
664                 rcu_assign_pointer(netlbl_unlhsh_def, NULL);
665         spin_unlock(&netlbl_unlhsh_lock);
666
667         call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
668         return;
669
670 unlhsh_condremove_failure:
671         spin_unlock(&netlbl_unlhsh_lock);
672         return;
673 }
674
675 /**
676  * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
677  * @net: network namespace
678  * @dev_name: interface name
679  * @addr: IP address in network byte order
680  * @mask: address mask in network byte order
681  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
682  * @audit_info: NetLabel audit information
683  *
684  * Description:
685  * Removes and existing entry from the unlabeled connection hash table.
686  * Returns zero on success, negative values on failure.
687  *
688  */
689 int netlbl_unlhsh_remove(struct net *net,
690                          const char *dev_name,
691                          const void *addr,
692                          const void *mask,
693                          u32 addr_len,
694                          struct netlbl_audit *audit_info)
695 {
696         int ret_val;
697         struct net_device *dev;
698         struct netlbl_unlhsh_iface *iface;
699
700         if (addr_len != sizeof(struct in_addr) &&
701             addr_len != sizeof(struct in6_addr))
702                 return -EINVAL;
703
704         rcu_read_lock();
705         if (dev_name != NULL) {
706                 dev = dev_get_by_name_rcu(net, dev_name);
707                 if (dev == NULL) {
708                         ret_val = -ENODEV;
709                         goto unlhsh_remove_return;
710                 }
711                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
712         } else
713                 iface = rcu_dereference(netlbl_unlhsh_def);
714         if (iface == NULL) {
715                 ret_val = -ENOENT;
716                 goto unlhsh_remove_return;
717         }
718         switch (addr_len) {
719         case sizeof(struct in_addr):
720                 ret_val = netlbl_unlhsh_remove_addr4(net,
721                                                      iface, addr, mask,
722                                                      audit_info);
723                 break;
724 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
725         case sizeof(struct in6_addr):
726                 ret_val = netlbl_unlhsh_remove_addr6(net,
727                                                      iface, addr, mask,
728                                                      audit_info);
729                 break;
730 #endif /* IPv6 */
731         default:
732                 ret_val = -EINVAL;
733         }
734         if (ret_val == 0) {
735                 netlbl_unlhsh_condremove_iface(iface);
736                 atomic_dec(&netlabel_mgmt_protocount);
737         }
738
739 unlhsh_remove_return:
740         rcu_read_unlock();
741         return ret_val;
742 }
743
744 /*
745  * General Helper Functions
746  */
747
748 /**
749  * netlbl_unlhsh_netdev_handler - Network device notification handler
750  * @this: notifier block
751  * @event: the event
752  * @ptr: the network device (cast to void)
753  *
754  * Description:
755  * Handle network device events, although at present all we care about is a
756  * network device going away.  In the case of a device going away we clear any
757  * related entries from the unlabeled connection hash table.
758  *
759  */
760 static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
761                                         unsigned long event,
762                                         void *ptr)
763 {
764         struct net_device *dev = ptr;
765         struct netlbl_unlhsh_iface *iface = NULL;
766
767         if (!net_eq(dev_net(dev), &init_net))
768                 return NOTIFY_DONE;
769
770         /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
771         if (event == NETDEV_DOWN) {
772                 spin_lock(&netlbl_unlhsh_lock);
773                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
774                 if (iface != NULL && iface->valid) {
775                         iface->valid = 0;
776                         list_del_rcu(&iface->list);
777                 } else
778                         iface = NULL;
779                 spin_unlock(&netlbl_unlhsh_lock);
780         }
781
782         if (iface != NULL)
783                 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
784
785         return NOTIFY_DONE;
786 }
787
788 /**
789  * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
790  * @value: desired value
791  * @audit_info: NetLabel audit information
792  *
793  * Description:
794  * Set the value of the unlabeled accept flag to @value.
795  *
796  */
797 static void netlbl_unlabel_acceptflg_set(u8 value,
798                                          struct netlbl_audit *audit_info)
799 {
800         struct audit_buffer *audit_buf;
801         u8 old_val;
802
803         old_val = netlabel_unlabel_acceptflg;
804         netlabel_unlabel_acceptflg = value;
805         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
806                                               audit_info);
807         if (audit_buf != NULL) {
808                 audit_log_format(audit_buf,
809                                  " unlbl_accept=%u old=%u", value, old_val);
810                 audit_log_end(audit_buf);
811         }
812 }
813
814 /**
815  * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
816  * @info: the Generic NETLINK info block
817  * @addr: the IP address
818  * @mask: the IP address mask
819  * @len: the address length
820  *
821  * Description:
822  * Examine the Generic NETLINK message and extract the IP address information.
823  * Returns zero on success, negative values on failure.
824  *
825  */
826 static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
827                                        void **addr,
828                                        void **mask,
829                                        u32 *len)
830 {
831         u32 addr_len;
832
833         if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
834                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
835                 if (addr_len != sizeof(struct in_addr) &&
836                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
837                         return -EINVAL;
838                 *len = addr_len;
839                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
840                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
841                 return 0;
842         } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
843                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
844                 if (addr_len != sizeof(struct in6_addr) &&
845                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
846                         return -EINVAL;
847                 *len = addr_len;
848                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
849                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
850                 return 0;
851         }
852
853         return -EINVAL;
854 }
855
856 /*
857  * NetLabel Command Handlers
858  */
859
860 /**
861  * netlbl_unlabel_accept - Handle an ACCEPT message
862  * @skb: the NETLINK buffer
863  * @info: the Generic NETLINK info block
864  *
865  * Description:
866  * Process a user generated ACCEPT message and set the accept flag accordingly.
867  * Returns zero on success, negative values on failure.
868  *
869  */
870 static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
871 {
872         u8 value;
873         struct netlbl_audit audit_info;
874
875         if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
876                 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
877                 if (value == 1 || value == 0) {
878                         netlbl_netlink_auditinfo(skb, &audit_info);
879                         netlbl_unlabel_acceptflg_set(value, &audit_info);
880                         return 0;
881                 }
882         }
883
884         return -EINVAL;
885 }
886
887 /**
888  * netlbl_unlabel_list - Handle a LIST message
889  * @skb: the NETLINK buffer
890  * @info: the Generic NETLINK info block
891  *
892  * Description:
893  * Process a user generated LIST message and respond with the current status.
894  * Returns zero on success, negative values on failure.
895  *
896  */
897 static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
898 {
899         int ret_val = -EINVAL;
900         struct sk_buff *ans_skb;
901         void *data;
902
903         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
904         if (ans_skb == NULL)
905                 goto list_failure;
906         data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
907                                  0, NLBL_UNLABEL_C_LIST);
908         if (data == NULL) {
909                 ret_val = -ENOMEM;
910                 goto list_failure;
911         }
912
913         ret_val = nla_put_u8(ans_skb,
914                              NLBL_UNLABEL_A_ACPTFLG,
915                              netlabel_unlabel_acceptflg);
916         if (ret_val != 0)
917                 goto list_failure;
918
919         genlmsg_end(ans_skb, data);
920         return genlmsg_reply(ans_skb, info);
921
922 list_failure:
923         kfree_skb(ans_skb);
924         return ret_val;
925 }
926
927 /**
928  * netlbl_unlabel_staticadd - Handle a STATICADD message
929  * @skb: the NETLINK buffer
930  * @info: the Generic NETLINK info block
931  *
932  * Description:
933  * Process a user generated STATICADD message and add a new unlabeled
934  * connection entry to the hash table.  Returns zero on success, negative
935  * values on failure.
936  *
937  */
938 static int netlbl_unlabel_staticadd(struct sk_buff *skb,
939                                     struct genl_info *info)
940 {
941         int ret_val;
942         char *dev_name;
943         void *addr;
944         void *mask;
945         u32 addr_len;
946         u32 secid;
947         struct netlbl_audit audit_info;
948
949         /* Don't allow users to add both IPv4 and IPv6 addresses for a
950          * single entry.  However, allow users to create two entries, one each
951          * for IPv4 and IPv4, with the same LSM security context which should
952          * achieve the same result. */
953         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
954             !info->attrs[NLBL_UNLABEL_A_IFACE] ||
955             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
956                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
957               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
958                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
959                 return -EINVAL;
960
961         netlbl_netlink_auditinfo(skb, &audit_info);
962
963         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
964         if (ret_val != 0)
965                 return ret_val;
966         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
967         ret_val = security_secctx_to_secid(
968                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
969                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
970                                   &secid);
971         if (ret_val != 0)
972                 return ret_val;
973
974         return netlbl_unlhsh_add(&init_net,
975                                  dev_name, addr, mask, addr_len, secid,
976                                  &audit_info);
977 }
978
979 /**
980  * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
981  * @skb: the NETLINK buffer
982  * @info: the Generic NETLINK info block
983  *
984  * Description:
985  * Process a user generated STATICADDDEF message and add a new default
986  * unlabeled connection entry.  Returns zero on success, negative values on
987  * failure.
988  *
989  */
990 static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
991                                        struct genl_info *info)
992 {
993         int ret_val;
994         void *addr;
995         void *mask;
996         u32 addr_len;
997         u32 secid;
998         struct netlbl_audit audit_info;
999
1000         /* Don't allow users to add both IPv4 and IPv6 addresses for a
1001          * single entry.  However, allow users to create two entries, one each
1002          * for IPv4 and IPv6, with the same LSM security context which should
1003          * achieve the same result. */
1004         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
1005             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1006                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1007               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1008                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1009                 return -EINVAL;
1010
1011         netlbl_netlink_auditinfo(skb, &audit_info);
1012
1013         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1014         if (ret_val != 0)
1015                 return ret_val;
1016         ret_val = security_secctx_to_secid(
1017                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1018                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1019                                   &secid);
1020         if (ret_val != 0)
1021                 return ret_val;
1022
1023         return netlbl_unlhsh_add(&init_net,
1024                                  NULL, addr, mask, addr_len, secid,
1025                                  &audit_info);
1026 }
1027
1028 /**
1029  * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
1030  * @skb: the NETLINK buffer
1031  * @info: the Generic NETLINK info block
1032  *
1033  * Description:
1034  * Process a user generated STATICREMOVE message and remove the specified
1035  * unlabeled connection entry.  Returns zero on success, negative values on
1036  * failure.
1037  *
1038  */
1039 static int netlbl_unlabel_staticremove(struct sk_buff *skb,
1040                                        struct genl_info *info)
1041 {
1042         int ret_val;
1043         char *dev_name;
1044         void *addr;
1045         void *mask;
1046         u32 addr_len;
1047         struct netlbl_audit audit_info;
1048
1049         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1050          * IPv4 and IPv6 in the same entry. */
1051         if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
1052             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1053                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1054               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1055                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1056                 return -EINVAL;
1057
1058         netlbl_netlink_auditinfo(skb, &audit_info);
1059
1060         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1061         if (ret_val != 0)
1062                 return ret_val;
1063         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1064
1065         return netlbl_unlhsh_remove(&init_net,
1066                                     dev_name, addr, mask, addr_len,
1067                                     &audit_info);
1068 }
1069
1070 /**
1071  * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1072  * @skb: the NETLINK buffer
1073  * @info: the Generic NETLINK info block
1074  *
1075  * Description:
1076  * Process a user generated STATICREMOVEDEF message and remove the default
1077  * unlabeled connection entry.  Returns zero on success, negative values on
1078  * failure.
1079  *
1080  */
1081 static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1082                                           struct genl_info *info)
1083 {
1084         int ret_val;
1085         void *addr;
1086         void *mask;
1087         u32 addr_len;
1088         struct netlbl_audit audit_info;
1089
1090         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1091          * IPv4 and IPv6 in the same entry. */
1092         if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1093                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1094               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1095                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1096                 return -EINVAL;
1097
1098         netlbl_netlink_auditinfo(skb, &audit_info);
1099
1100         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1101         if (ret_val != 0)
1102                 return ret_val;
1103
1104         return netlbl_unlhsh_remove(&init_net,
1105                                     NULL, addr, mask, addr_len,
1106                                     &audit_info);
1107 }
1108
1109
1110 /**
1111  * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1112  * @cmd: command/message
1113  * @iface: the interface entry
1114  * @addr4: the IPv4 address entry
1115  * @addr6: the IPv6 address entry
1116  * @arg: the netlbl_unlhsh_walk_arg structure
1117  *
1118  * Description:
1119  * This function is designed to be used to generate a response for a
1120  * STATICLIST or STATICLISTDEF message.  When called either @addr4 or @addr6
1121  * can be specified, not both, the other unspecified entry should be set to
1122  * NULL by the caller.  Returns the size of the message on success, negative
1123  * values on failure.
1124  *
1125  */
1126 static int netlbl_unlabel_staticlist_gen(u32 cmd,
1127                                        const struct netlbl_unlhsh_iface *iface,
1128                                        const struct netlbl_unlhsh_addr4 *addr4,
1129                                        const struct netlbl_unlhsh_addr6 *addr6,
1130                                        void *arg)
1131 {
1132         int ret_val = -ENOMEM;
1133         struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1134         struct net_device *dev;
1135         void *data;
1136         u32 secid;
1137         char *secctx;
1138         u32 secctx_len;
1139
1140         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
1141                            cb_arg->seq, &netlbl_unlabel_gnl_family,
1142                            NLM_F_MULTI, cmd);
1143         if (data == NULL)
1144                 goto list_cb_failure;
1145
1146         if (iface->ifindex > 0) {
1147                 dev = dev_get_by_index(&init_net, iface->ifindex);
1148                 if (!dev) {
1149                         ret_val = -ENODEV;
1150                         goto list_cb_failure;
1151                 }
1152                 ret_val = nla_put_string(cb_arg->skb,
1153                                          NLBL_UNLABEL_A_IFACE, dev->name);
1154                 dev_put(dev);
1155                 if (ret_val != 0)
1156                         goto list_cb_failure;
1157         }
1158
1159         if (addr4) {
1160                 struct in_addr addr_struct;
1161
1162                 addr_struct.s_addr = addr4->list.addr;
1163                 ret_val = nla_put(cb_arg->skb,
1164                                   NLBL_UNLABEL_A_IPV4ADDR,
1165                                   sizeof(struct in_addr),
1166                                   &addr_struct);
1167                 if (ret_val != 0)
1168                         goto list_cb_failure;
1169
1170                 addr_struct.s_addr = addr4->list.mask;
1171                 ret_val = nla_put(cb_arg->skb,
1172                                   NLBL_UNLABEL_A_IPV4MASK,
1173                                   sizeof(struct in_addr),
1174                                   &addr_struct);
1175                 if (ret_val != 0)
1176                         goto list_cb_failure;
1177
1178                 secid = addr4->secid;
1179         } else {
1180                 ret_val = nla_put(cb_arg->skb,
1181                                   NLBL_UNLABEL_A_IPV6ADDR,
1182                                   sizeof(struct in6_addr),
1183                                   &addr6->list.addr);
1184                 if (ret_val != 0)
1185                         goto list_cb_failure;
1186
1187                 ret_val = nla_put(cb_arg->skb,
1188                                   NLBL_UNLABEL_A_IPV6MASK,
1189                                   sizeof(struct in6_addr),
1190                                   &addr6->list.mask);
1191                 if (ret_val != 0)
1192                         goto list_cb_failure;
1193
1194                 secid = addr6->secid;
1195         }
1196
1197         ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
1198         if (ret_val != 0)
1199                 goto list_cb_failure;
1200         ret_val = nla_put(cb_arg->skb,
1201                           NLBL_UNLABEL_A_SECCTX,
1202                           secctx_len,
1203                           secctx);
1204         security_release_secctx(secctx, secctx_len);
1205         if (ret_val != 0)
1206                 goto list_cb_failure;
1207
1208         cb_arg->seq++;
1209         return genlmsg_end(cb_arg->skb, data);
1210
1211 list_cb_failure:
1212         genlmsg_cancel(cb_arg->skb, data);
1213         return ret_val;
1214 }
1215
1216 /**
1217  * netlbl_unlabel_staticlist - Handle a STATICLIST message
1218  * @skb: the NETLINK buffer
1219  * @cb: the NETLINK callback
1220  *
1221  * Description:
1222  * Process a user generated STATICLIST message and dump the unlabeled
1223  * connection hash table in a form suitable for use in a kernel generated
1224  * STATICLIST message.  Returns the length of @skb.
1225  *
1226  */
1227 static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1228                                      struct netlink_callback *cb)
1229 {
1230         struct netlbl_unlhsh_walk_arg cb_arg;
1231         u32 skip_bkt = cb->args[0];
1232         u32 skip_chain = cb->args[1];
1233         u32 skip_addr4 = cb->args[2];
1234         u32 skip_addr6 = cb->args[3];
1235         u32 iter_bkt;
1236         u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1237         struct netlbl_unlhsh_iface *iface;
1238         struct list_head *iter_list;
1239         struct netlbl_af4list *addr4;
1240 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1241         struct netlbl_af6list *addr6;
1242 #endif
1243
1244         cb_arg.nl_cb = cb;
1245         cb_arg.skb = skb;
1246         cb_arg.seq = cb->nlh->nlmsg_seq;
1247
1248         rcu_read_lock();
1249         for (iter_bkt = skip_bkt;
1250              iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1251              iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
1252                 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
1253                 list_for_each_entry_rcu(iface, iter_list, list) {
1254                         if (!iface->valid ||
1255                             iter_chain++ < skip_chain)
1256                                 continue;
1257                         netlbl_af4list_foreach_rcu(addr4,
1258                                                    &iface->addr4_list) {
1259                                 if (iter_addr4++ < skip_addr4)
1260                                         continue;
1261                                 if (netlbl_unlabel_staticlist_gen(
1262                                               NLBL_UNLABEL_C_STATICLIST,
1263                                               iface,
1264                                               netlbl_unlhsh_addr4_entry(addr4),
1265                                               NULL,
1266                                               &cb_arg) < 0) {
1267                                         iter_addr4--;
1268                                         iter_chain--;
1269                                         goto unlabel_staticlist_return;
1270                                 }
1271                         }
1272 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1273                         netlbl_af6list_foreach_rcu(addr6,
1274                                                    &iface->addr6_list) {
1275                                 if (iter_addr6++ < skip_addr6)
1276                                         continue;
1277                                 if (netlbl_unlabel_staticlist_gen(
1278                                               NLBL_UNLABEL_C_STATICLIST,
1279                                               iface,
1280                                               NULL,
1281                                               netlbl_unlhsh_addr6_entry(addr6),
1282                                               &cb_arg) < 0) {
1283                                         iter_addr6--;
1284                                         iter_chain--;
1285                                         goto unlabel_staticlist_return;
1286                                 }
1287                         }
1288 #endif /* IPv6 */
1289                 }
1290         }
1291
1292 unlabel_staticlist_return:
1293         rcu_read_unlock();
1294         cb->args[0] = skip_bkt;
1295         cb->args[1] = skip_chain;
1296         cb->args[2] = skip_addr4;
1297         cb->args[3] = skip_addr6;
1298         return skb->len;
1299 }
1300
1301 /**
1302  * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1303  * @skb: the NETLINK buffer
1304  * @cb: the NETLINK callback
1305  *
1306  * Description:
1307  * Process a user generated STATICLISTDEF message and dump the default
1308  * unlabeled connection entry in a form suitable for use in a kernel generated
1309  * STATICLISTDEF message.  Returns the length of @skb.
1310  *
1311  */
1312 static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1313                                         struct netlink_callback *cb)
1314 {
1315         struct netlbl_unlhsh_walk_arg cb_arg;
1316         struct netlbl_unlhsh_iface *iface;
1317         u32 skip_addr4 = cb->args[0];
1318         u32 skip_addr6 = cb->args[1];
1319         u32 iter_addr4 = 0;
1320         struct netlbl_af4list *addr4;
1321 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1322         u32 iter_addr6 = 0;
1323         struct netlbl_af6list *addr6;
1324 #endif
1325
1326         cb_arg.nl_cb = cb;
1327         cb_arg.skb = skb;
1328         cb_arg.seq = cb->nlh->nlmsg_seq;
1329
1330         rcu_read_lock();
1331         iface = rcu_dereference(netlbl_unlhsh_def);
1332         if (iface == NULL || !iface->valid)
1333                 goto unlabel_staticlistdef_return;
1334
1335         netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
1336                 if (iter_addr4++ < skip_addr4)
1337                         continue;
1338                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1339                                               iface,
1340                                               netlbl_unlhsh_addr4_entry(addr4),
1341                                               NULL,
1342                                               &cb_arg) < 0) {
1343                         iter_addr4--;
1344                         goto unlabel_staticlistdef_return;
1345                 }
1346         }
1347 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1348         netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
1349                 if (iter_addr6++ < skip_addr6)
1350                         continue;
1351                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1352                                               iface,
1353                                               NULL,
1354                                               netlbl_unlhsh_addr6_entry(addr6),
1355                                               &cb_arg) < 0) {
1356                         iter_addr6--;
1357                         goto unlabel_staticlistdef_return;
1358                 }
1359         }
1360 #endif /* IPv6 */
1361
1362 unlabel_staticlistdef_return:
1363         rcu_read_unlock();
1364         cb->args[0] = skip_addr4;
1365         cb->args[1] = skip_addr6;
1366         return skb->len;
1367 }
1368
1369 /*
1370  * NetLabel Generic NETLINK Command Definitions
1371  */
1372
1373 static struct genl_ops netlbl_unlabel_genl_ops[] = {
1374         {
1375         .cmd = NLBL_UNLABEL_C_STATICADD,
1376         .flags = GENL_ADMIN_PERM,
1377         .policy = netlbl_unlabel_genl_policy,
1378         .doit = netlbl_unlabel_staticadd,
1379         .dumpit = NULL,
1380         },
1381         {
1382         .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1383         .flags = GENL_ADMIN_PERM,
1384         .policy = netlbl_unlabel_genl_policy,
1385         .doit = netlbl_unlabel_staticremove,
1386         .dumpit = NULL,
1387         },
1388         {
1389         .cmd = NLBL_UNLABEL_C_STATICLIST,
1390         .flags = 0,
1391         .policy = netlbl_unlabel_genl_policy,
1392         .doit = NULL,
1393         .dumpit = netlbl_unlabel_staticlist,
1394         },
1395         {
1396         .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1397         .flags = GENL_ADMIN_PERM,
1398         .policy = netlbl_unlabel_genl_policy,
1399         .doit = netlbl_unlabel_staticadddef,
1400         .dumpit = NULL,
1401         },
1402         {
1403         .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1404         .flags = GENL_ADMIN_PERM,
1405         .policy = netlbl_unlabel_genl_policy,
1406         .doit = netlbl_unlabel_staticremovedef,
1407         .dumpit = NULL,
1408         },
1409         {
1410         .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1411         .flags = 0,
1412         .policy = netlbl_unlabel_genl_policy,
1413         .doit = NULL,
1414         .dumpit = netlbl_unlabel_staticlistdef,
1415         },
1416         {
1417         .cmd = NLBL_UNLABEL_C_ACCEPT,
1418         .flags = GENL_ADMIN_PERM,
1419         .policy = netlbl_unlabel_genl_policy,
1420         .doit = netlbl_unlabel_accept,
1421         .dumpit = NULL,
1422         },
1423         {
1424         .cmd = NLBL_UNLABEL_C_LIST,
1425         .flags = 0,
1426         .policy = netlbl_unlabel_genl_policy,
1427         .doit = netlbl_unlabel_list,
1428         .dumpit = NULL,
1429         },
1430 };
1431
1432 /*
1433  * NetLabel Generic NETLINK Protocol Functions
1434  */
1435
1436 /**
1437  * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
1438  *
1439  * Description:
1440  * Register the unlabeled packet NetLabel component with the Generic NETLINK
1441  * mechanism.  Returns zero on success, negative values on failure.
1442  *
1443  */
1444 int __init netlbl_unlabel_genl_init(void)
1445 {
1446         return genl_register_family_with_ops(&netlbl_unlabel_gnl_family,
1447                 netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops));
1448 }
1449
1450 /*
1451  * NetLabel KAPI Hooks
1452  */
1453
1454 static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1455         .notifier_call = netlbl_unlhsh_netdev_handler,
1456 };
1457
1458 /**
1459  * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1460  * @size: the number of bits to use for the hash buckets
1461  *
1462  * Description:
1463  * Initializes the unlabeled connection hash table and registers a network
1464  * device notification handler.  This function should only be called by the
1465  * NetLabel subsystem itself during initialization.  Returns zero on success,
1466  * non-zero values on error.
1467  *
1468  */
1469 int __init netlbl_unlabel_init(u32 size)
1470 {
1471         u32 iter;
1472         struct netlbl_unlhsh_tbl *hsh_tbl;
1473
1474         if (size == 0)
1475                 return -EINVAL;
1476
1477         hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1478         if (hsh_tbl == NULL)
1479                 return -ENOMEM;
1480         hsh_tbl->size = 1 << size;
1481         hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1482                                sizeof(struct list_head),
1483                                GFP_KERNEL);
1484         if (hsh_tbl->tbl == NULL) {
1485                 kfree(hsh_tbl);
1486                 return -ENOMEM;
1487         }
1488         for (iter = 0; iter < hsh_tbl->size; iter++)
1489                 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
1490
1491         rcu_read_lock();
1492         spin_lock(&netlbl_unlhsh_lock);
1493         rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1494         spin_unlock(&netlbl_unlhsh_lock);
1495         rcu_read_unlock();
1496
1497         register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
1498
1499         return 0;
1500 }
1501
1502 /**
1503  * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1504  * @skb: the packet
1505  * @family: protocol family
1506  * @secattr: the security attributes
1507  *
1508  * Description:
1509  * Determine the security attributes, if any, for an unlabled packet and return
1510  * them in @secattr.  Returns zero on success and negative values on failure.
1511  *
1512  */
1513 int netlbl_unlabel_getattr(const struct sk_buff *skb,
1514                            u16 family,
1515                            struct netlbl_lsm_secattr *secattr)
1516 {
1517         struct netlbl_unlhsh_iface *iface;
1518
1519         rcu_read_lock();
1520         iface = netlbl_unlhsh_search_iface(skb->skb_iif);
1521         if (iface == NULL)
1522                 iface = rcu_dereference(netlbl_unlhsh_def);
1523         if (iface == NULL || !iface->valid)
1524                 goto unlabel_getattr_nolabel;
1525         switch (family) {
1526         case PF_INET: {
1527                 struct iphdr *hdr4;
1528                 struct netlbl_af4list *addr4;
1529
1530                 hdr4 = ip_hdr(skb);
1531                 addr4 = netlbl_af4list_search(hdr4->saddr,
1532                                               &iface->addr4_list);
1533                 if (addr4 == NULL)
1534                         goto unlabel_getattr_nolabel;
1535                 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
1536                 break;
1537         }
1538 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1539         case PF_INET6: {
1540                 struct ipv6hdr *hdr6;
1541                 struct netlbl_af6list *addr6;
1542
1543                 hdr6 = ipv6_hdr(skb);
1544                 addr6 = netlbl_af6list_search(&hdr6->saddr,
1545                                               &iface->addr6_list);
1546                 if (addr6 == NULL)
1547                         goto unlabel_getattr_nolabel;
1548                 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
1549                 break;
1550         }
1551 #endif /* IPv6 */
1552         default:
1553                 goto unlabel_getattr_nolabel;
1554         }
1555         rcu_read_unlock();
1556
1557         secattr->flags |= NETLBL_SECATTR_SECID;
1558         secattr->type = NETLBL_NLTYPE_UNLABELED;
1559         return 0;
1560
1561 unlabel_getattr_nolabel:
1562         rcu_read_unlock();
1563         if (netlabel_unlabel_acceptflg == 0)
1564                 return -ENOMSG;
1565         secattr->type = NETLBL_NLTYPE_UNLABELED;
1566         return 0;
1567 }
1568
1569 /**
1570  * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
1571  *
1572  * Description:
1573  * Set the default NetLabel configuration to allow incoming unlabeled packets
1574  * and to send unlabeled network traffic by default.
1575  *
1576  */
1577 int __init netlbl_unlabel_defconf(void)
1578 {
1579         int ret_val;
1580         struct netlbl_dom_map *entry;
1581         struct netlbl_audit audit_info;
1582
1583         /* Only the kernel is allowed to call this function and the only time
1584          * it is called is at bootup before the audit subsystem is reporting
1585          * messages so don't worry to much about these values. */
1586         security_task_getsecid(current, &audit_info.secid);
1587         audit_info.loginuid = 0;
1588         audit_info.sessionid = 0;
1589
1590         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1591         if (entry == NULL)
1592                 return -ENOMEM;
1593         entry->type = NETLBL_NLTYPE_UNLABELED;
1594         ret_val = netlbl_domhsh_add_default(entry, &audit_info);
1595         if (ret_val != 0)
1596                 return ret_val;
1597
1598         netlbl_unlabel_acceptflg_set(1, &audit_info);
1599
1600         return 0;
1601 }