netlabel: Add network address selectors to the NetLabel/LSM domain mapping
[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 static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
118 static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
119
120 /* Accept unlabeled packets flag */
121 static u8 netlabel_unlabel_acceptflg = 0;
122
123 /* NetLabel Generic NETLINK unlabeled family */
124 static struct genl_family netlbl_unlabel_gnl_family = {
125         .id = GENL_ID_GENERATE,
126         .hdrsize = 0,
127         .name = NETLBL_NLTYPE_UNLABELED_NAME,
128         .version = NETLBL_PROTO_VERSION,
129         .maxattr = NLBL_UNLABEL_A_MAX,
130 };
131
132 /* NetLabel Netlink attribute policy */
133 static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
134         [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
135         [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
136                                       .len = sizeof(struct in6_addr) },
137         [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
138                                       .len = sizeof(struct in6_addr) },
139         [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
140                                       .len = sizeof(struct in_addr) },
141         [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
142                                       .len = sizeof(struct in_addr) },
143         [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
144                                    .len = IFNAMSIZ - 1 },
145         [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
146 };
147
148 /*
149  * Unlabeled Connection Hash Table Functions
150  */
151
152 /**
153  * netlbl_unlhsh_free_addr4 - Frees an IPv4 address entry from the hash table
154  * @entry: the entry's RCU field
155  *
156  * Description:
157  * This function is designed to be used as a callback to the call_rcu()
158  * function so that memory allocated to a hash table address entry can be
159  * released safely.
160  *
161  */
162 static void netlbl_unlhsh_free_addr4(struct rcu_head *entry)
163 {
164         struct netlbl_unlhsh_addr4 *ptr;
165
166         ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu);
167         kfree(ptr);
168 }
169
170 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
171 /**
172  * netlbl_unlhsh_free_addr6 - Frees an IPv6 address entry from the hash table
173  * @entry: the entry's RCU field
174  *
175  * Description:
176  * This function is designed to be used as a callback to the call_rcu()
177  * function so that memory allocated to a hash table address entry can be
178  * released safely.
179  *
180  */
181 static void netlbl_unlhsh_free_addr6(struct rcu_head *entry)
182 {
183         struct netlbl_unlhsh_addr6 *ptr;
184
185         ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu);
186         kfree(ptr);
187 }
188 #endif /* IPv6 */
189
190 /**
191  * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
192  * @entry: the entry's RCU field
193  *
194  * Description:
195  * This function is designed to be used as a callback to the call_rcu()
196  * function so that memory allocated to a hash table interface entry can be
197  * released safely.  It is important to note that this function does not free
198  * the IPv4 and IPv6 address lists contained as part of an interface entry.  It
199  * is up to the rest of the code to make sure an interface entry is only freed
200  * once it's address lists are empty.
201  *
202  */
203 static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
204 {
205         struct netlbl_unlhsh_iface *iface;
206         struct netlbl_af4list *iter4;
207         struct netlbl_af4list *tmp4;
208 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
209         struct netlbl_af6list *iter6;
210         struct netlbl_af6list *tmp6;
211 #endif /* IPv6 */
212
213         iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
214
215         /* no need for locks here since we are the only one with access to this
216          * structure */
217
218         netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
219                 netlbl_af4list_remove_entry(iter4);
220                 kfree(netlbl_unlhsh_addr4_entry(iter4));
221         }
222 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
223         netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
224                 netlbl_af6list_remove_entry(iter6);
225                 kfree(netlbl_unlhsh_addr6_entry(iter6));
226         }
227 #endif /* IPv6 */
228         kfree(iface);
229 }
230
231 /**
232  * netlbl_unlhsh_hash - Hashing function for the hash table
233  * @ifindex: the network interface/device to hash
234  *
235  * Description:
236  * This is the hashing function for the unlabeled hash table, it returns the
237  * bucket number for the given device/interface.  The caller is responsible for
238  * calling the rcu_read_[un]lock() functions.
239  *
240  */
241 static u32 netlbl_unlhsh_hash(int ifindex)
242 {
243         /* this is taken _almost_ directly from
244          * security/selinux/netif.c:sel_netif_hasfn() as they do pretty much
245          * the same thing */
246         return ifindex & (rcu_dereference(netlbl_unlhsh)->size - 1);
247 }
248
249 /**
250  * netlbl_unlhsh_search_iface - Search for a matching interface entry
251  * @ifindex: the network interface
252  *
253  * Description:
254  * Searches the unlabeled connection hash table and returns a pointer to the
255  * interface entry which matches @ifindex, otherwise NULL is returned.  The
256  * caller is responsible for calling the rcu_read_[un]lock() functions.
257  *
258  */
259 static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
260 {
261         u32 bkt;
262         struct list_head *bkt_list;
263         struct netlbl_unlhsh_iface *iter;
264
265         bkt = netlbl_unlhsh_hash(ifindex);
266         bkt_list = &rcu_dereference(netlbl_unlhsh)->tbl[bkt];
267         list_for_each_entry_rcu(iter, bkt_list, list)
268                 if (iter->valid && iter->ifindex == ifindex)
269                         return iter;
270
271         return NULL;
272 }
273
274 /**
275  * netlbl_unlhsh_search_iface_def - Search for a matching interface entry
276  * @ifindex: the network interface
277  *
278  * Description:
279  * Searches the unlabeled connection hash table and returns a pointer to the
280  * interface entry which matches @ifindex.  If an exact match can not be found
281  * and there is a valid default entry, the default entry is returned, otherwise
282  * NULL is returned.  The caller is responsible for calling the
283  * rcu_read_[un]lock() functions.
284  *
285  */
286 static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface_def(int ifindex)
287 {
288         struct netlbl_unlhsh_iface *entry;
289
290         entry = netlbl_unlhsh_search_iface(ifindex);
291         if (entry != NULL)
292                 return entry;
293
294         entry = rcu_dereference(netlbl_unlhsh_def);
295         if (entry != NULL && entry->valid)
296                 return entry;
297
298         return NULL;
299 }
300
301 /**
302  * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
303  * @iface: the associated interface entry
304  * @addr: IPv4 address in network byte order
305  * @mask: IPv4 address mask in network byte order
306  * @secid: LSM secid value for entry
307  *
308  * Description:
309  * Add a new address entry into the unlabeled connection hash table using the
310  * interface entry specified by @iface.  On success zero is returned, otherwise
311  * a negative value is returned.  The caller is responsible for calling the
312  * rcu_read_[un]lock() functions.
313  *
314  */
315 static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
316                                    const struct in_addr *addr,
317                                    const struct in_addr *mask,
318                                    u32 secid)
319 {
320         int ret_val;
321         struct netlbl_unlhsh_addr4 *entry;
322
323         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
324         if (entry == NULL)
325                 return -ENOMEM;
326
327         entry->list.addr = addr->s_addr & mask->s_addr;
328         entry->list.mask = mask->s_addr;
329         entry->list.valid = 1;
330         INIT_RCU_HEAD(&entry->rcu);
331         entry->secid = secid;
332
333         spin_lock(&netlbl_unlhsh_lock);
334         ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
335         spin_unlock(&netlbl_unlhsh_lock);
336
337         if (ret_val != 0)
338                 kfree(entry);
339         return ret_val;
340 }
341
342 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
343 /**
344  * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
345  * @iface: the associated interface entry
346  * @addr: IPv6 address in network byte order
347  * @mask: IPv6 address mask in network byte order
348  * @secid: LSM secid value for entry
349  *
350  * Description:
351  * Add a new address entry into the unlabeled connection hash table using the
352  * interface entry specified by @iface.  On success zero is returned, otherwise
353  * a negative value is returned.  The caller is responsible for calling the
354  * rcu_read_[un]lock() functions.
355  *
356  */
357 static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
358                                    const struct in6_addr *addr,
359                                    const struct in6_addr *mask,
360                                    u32 secid)
361 {
362         int ret_val;
363         struct netlbl_unlhsh_addr6 *entry;
364
365         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
366         if (entry == NULL)
367                 return -ENOMEM;
368
369         ipv6_addr_copy(&entry->list.addr, addr);
370         entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
371         entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
372         entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
373         entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
374         ipv6_addr_copy(&entry->list.mask, mask);
375         entry->list.valid = 1;
376         INIT_RCU_HEAD(&entry->rcu);
377         entry->secid = secid;
378
379         spin_lock(&netlbl_unlhsh_lock);
380         ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
381         spin_unlock(&netlbl_unlhsh_lock);
382
383         if (ret_val != 0)
384                 kfree(entry);
385         return 0;
386 }
387 #endif /* IPv6 */
388
389 /**
390  * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
391  * @ifindex: network interface
392  *
393  * Description:
394  * Add a new, empty, interface entry into the unlabeled connection hash table.
395  * On success a pointer to the new interface entry is returned, on failure NULL
396  * is returned.  The caller is responsible for calling the rcu_read_[un]lock()
397  * functions.
398  *
399  */
400 static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
401 {
402         u32 bkt;
403         struct netlbl_unlhsh_iface *iface;
404
405         iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
406         if (iface == NULL)
407                 return NULL;
408
409         iface->ifindex = ifindex;
410         INIT_LIST_HEAD(&iface->addr4_list);
411         INIT_LIST_HEAD(&iface->addr6_list);
412         iface->valid = 1;
413         INIT_RCU_HEAD(&iface->rcu);
414
415         spin_lock(&netlbl_unlhsh_lock);
416         if (ifindex > 0) {
417                 bkt = netlbl_unlhsh_hash(ifindex);
418                 if (netlbl_unlhsh_search_iface(ifindex) != NULL)
419                         goto add_iface_failure;
420                 list_add_tail_rcu(&iface->list,
421                                   &rcu_dereference(netlbl_unlhsh)->tbl[bkt]);
422         } else {
423                 INIT_LIST_HEAD(&iface->list);
424                 if (rcu_dereference(netlbl_unlhsh_def) != NULL)
425                         goto add_iface_failure;
426                 rcu_assign_pointer(netlbl_unlhsh_def, iface);
427         }
428         spin_unlock(&netlbl_unlhsh_lock);
429
430         return iface;
431
432 add_iface_failure:
433         spin_unlock(&netlbl_unlhsh_lock);
434         kfree(iface);
435         return NULL;
436 }
437
438 /**
439  * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
440  * @net: network namespace
441  * @dev_name: interface name
442  * @addr: IP address in network byte order
443  * @mask: address mask in network byte order
444  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
445  * @secid: LSM secid value for the entry
446  * @audit_info: NetLabel audit information
447  *
448  * Description:
449  * Adds a new entry to the unlabeled connection hash table.  Returns zero on
450  * success, negative values on failure.
451  *
452  */
453 static int netlbl_unlhsh_add(struct net *net,
454                              const char *dev_name,
455                              const void *addr,
456                              const void *mask,
457                              u32 addr_len,
458                              u32 secid,
459                              struct netlbl_audit *audit_info)
460 {
461         int ret_val;
462         int ifindex;
463         struct net_device *dev;
464         struct netlbl_unlhsh_iface *iface;
465         struct audit_buffer *audit_buf = NULL;
466         char *secctx = NULL;
467         u32 secctx_len;
468
469         if (addr_len != sizeof(struct in_addr) &&
470             addr_len != sizeof(struct in6_addr))
471                 return -EINVAL;
472
473         rcu_read_lock();
474         if (dev_name != NULL) {
475                 dev = dev_get_by_name(net, dev_name);
476                 if (dev == NULL) {
477                         ret_val = -ENODEV;
478                         goto unlhsh_add_return;
479                 }
480                 ifindex = dev->ifindex;
481                 dev_put(dev);
482                 iface = netlbl_unlhsh_search_iface(ifindex);
483         } else {
484                 ifindex = 0;
485                 iface = rcu_dereference(netlbl_unlhsh_def);
486         }
487         if (iface == NULL) {
488                 iface = netlbl_unlhsh_add_iface(ifindex);
489                 if (iface == NULL) {
490                         ret_val = -ENOMEM;
491                         goto unlhsh_add_return;
492                 }
493         }
494         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
495                                               audit_info);
496         switch (addr_len) {
497         case sizeof(struct in_addr): {
498                 struct in_addr *addr4, *mask4;
499
500                 addr4 = (struct in_addr *)addr;
501                 mask4 = (struct in_addr *)mask;
502                 ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
503                 if (audit_buf != NULL)
504                         netlbl_af4list_audit_addr(audit_buf, 1,
505                                                   dev_name,
506                                                   addr4->s_addr,
507                                                   mask4->s_addr);
508                 break;
509         }
510 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
511         case sizeof(struct in6_addr): {
512                 struct in6_addr *addr6, *mask6;
513
514                 addr6 = (struct in6_addr *)addr;
515                 mask6 = (struct in6_addr *)mask;
516                 ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
517                 if (audit_buf != NULL)
518                         netlbl_af6list_audit_addr(audit_buf, 1,
519                                                   dev_name,
520                                                   addr6, mask6);
521                 break;
522         }
523 #endif /* IPv6 */
524         default:
525                 ret_val = -EINVAL;
526         }
527         if (ret_val == 0)
528                 atomic_inc(&netlabel_mgmt_protocount);
529
530 unlhsh_add_return:
531         rcu_read_unlock();
532         if (audit_buf != NULL) {
533                 if (security_secid_to_secctx(secid,
534                                              &secctx,
535                                              &secctx_len) == 0) {
536                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
537                         security_release_secctx(secctx, secctx_len);
538                 }
539                 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
540                 audit_log_end(audit_buf);
541         }
542         return ret_val;
543 }
544
545 /**
546  * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
547  * @net: network namespace
548  * @iface: interface entry
549  * @addr: IP address
550  * @mask: IP address mask
551  * @audit_info: NetLabel audit information
552  *
553  * Description:
554  * Remove an IP address entry from the unlabeled connection hash table.
555  * Returns zero on success, negative values on failure.  The caller is
556  * responsible for calling the rcu_read_[un]lock() functions.
557  *
558  */
559 static int netlbl_unlhsh_remove_addr4(struct net *net,
560                                       struct netlbl_unlhsh_iface *iface,
561                                       const struct in_addr *addr,
562                                       const struct in_addr *mask,
563                                       struct netlbl_audit *audit_info)
564 {
565         int ret_val = 0;
566         struct netlbl_af4list *list_entry;
567         struct netlbl_unlhsh_addr4 *entry;
568         struct audit_buffer *audit_buf;
569         struct net_device *dev;
570         char *secctx;
571         u32 secctx_len;
572
573         spin_lock(&netlbl_unlhsh_lock);
574         list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
575                                            &iface->addr4_list);
576         spin_unlock(&netlbl_unlhsh_lock);
577         if (list_entry == NULL)
578                 ret_val = -ENOENT;
579         entry = netlbl_unlhsh_addr4_entry(list_entry);
580
581         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
582                                               audit_info);
583         if (audit_buf != NULL) {
584                 dev = dev_get_by_index(net, iface->ifindex);
585                 netlbl_af4list_audit_addr(audit_buf, 1,
586                                           (dev != NULL ? dev->name : NULL),
587                                           addr->s_addr, mask->s_addr);
588                 if (dev != NULL)
589                         dev_put(dev);
590                 if (entry && security_secid_to_secctx(entry->secid,
591                                                       &secctx,
592                                                       &secctx_len) == 0) {
593                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
594                         security_release_secctx(secctx, secctx_len);
595                 }
596                 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
597                 audit_log_end(audit_buf);
598         }
599
600         if (ret_val == 0)
601                 call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
602         return ret_val;
603 }
604
605 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
606 /**
607  * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
608  * @net: network namespace
609  * @iface: interface entry
610  * @addr: IP address
611  * @mask: IP address mask
612  * @audit_info: NetLabel audit information
613  *
614  * Description:
615  * Remove an IP address entry from the unlabeled connection hash table.
616  * Returns zero on success, negative values on failure.  The caller is
617  * responsible for calling the rcu_read_[un]lock() functions.
618  *
619  */
620 static int netlbl_unlhsh_remove_addr6(struct net *net,
621                                       struct netlbl_unlhsh_iface *iface,
622                                       const struct in6_addr *addr,
623                                       const struct in6_addr *mask,
624                                       struct netlbl_audit *audit_info)
625 {
626         int ret_val = 0;
627         struct netlbl_af6list *list_entry;
628         struct netlbl_unlhsh_addr6 *entry;
629         struct audit_buffer *audit_buf;
630         struct net_device *dev;
631         char *secctx;
632         u32 secctx_len;
633
634         spin_lock(&netlbl_unlhsh_lock);
635         list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
636         spin_unlock(&netlbl_unlhsh_lock);
637         if (list_entry == NULL)
638                 ret_val = -ENOENT;
639         entry = netlbl_unlhsh_addr6_entry(list_entry);
640
641         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
642                                               audit_info);
643         if (audit_buf != NULL) {
644                 dev = dev_get_by_index(net, iface->ifindex);
645                 netlbl_af6list_audit_addr(audit_buf, 1,
646                                           (dev != NULL ? dev->name : NULL),
647                                           addr, mask);
648                 if (dev != NULL)
649                         dev_put(dev);
650                 if (entry && security_secid_to_secctx(entry->secid,
651                                                       &secctx,
652                                                       &secctx_len) == 0) {
653                         audit_log_format(audit_buf, " sec_obj=%s", secctx);
654                         security_release_secctx(secctx, secctx_len);
655                 }
656                 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
657                 audit_log_end(audit_buf);
658         }
659
660         if (ret_val == 0)
661                 call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
662         return ret_val;
663 }
664 #endif /* IPv6 */
665
666 /**
667  * netlbl_unlhsh_condremove_iface - Remove an interface entry
668  * @iface: the interface entry
669  *
670  * Description:
671  * Remove an interface entry from the unlabeled connection hash table if it is
672  * empty.  An interface entry is considered to be empty if there are no
673  * address entries assigned to it.
674  *
675  */
676 static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
677 {
678         struct netlbl_af4list *iter4;
679 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
680         struct netlbl_af6list *iter6;
681 #endif /* IPv6 */
682
683         spin_lock(&netlbl_unlhsh_lock);
684         netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
685                 goto unlhsh_condremove_failure;
686 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
687         netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
688                 goto unlhsh_condremove_failure;
689 #endif /* IPv6 */
690         iface->valid = 0;
691         if (iface->ifindex > 0)
692                 list_del_rcu(&iface->list);
693         else
694                 rcu_assign_pointer(netlbl_unlhsh_def, NULL);
695         spin_unlock(&netlbl_unlhsh_lock);
696
697         call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
698         return;
699
700 unlhsh_condremove_failure:
701         spin_unlock(&netlbl_unlhsh_lock);
702         return;
703 }
704
705 /**
706  * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
707  * @net: network namespace
708  * @dev_name: interface name
709  * @addr: IP address in network byte order
710  * @mask: address mask in network byte order
711  * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
712  * @audit_info: NetLabel audit information
713  *
714  * Description:
715  * Removes and existing entry from the unlabeled connection hash table.
716  * Returns zero on success, negative values on failure.
717  *
718  */
719 static int netlbl_unlhsh_remove(struct net *net,
720                                 const char *dev_name,
721                                 const void *addr,
722                                 const void *mask,
723                                 u32 addr_len,
724                                 struct netlbl_audit *audit_info)
725 {
726         int ret_val;
727         struct net_device *dev;
728         struct netlbl_unlhsh_iface *iface;
729
730         if (addr_len != sizeof(struct in_addr) &&
731             addr_len != sizeof(struct in6_addr))
732                 return -EINVAL;
733
734         rcu_read_lock();
735         if (dev_name != NULL) {
736                 dev = dev_get_by_name(net, dev_name);
737                 if (dev == NULL) {
738                         ret_val = -ENODEV;
739                         goto unlhsh_remove_return;
740                 }
741                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
742                 dev_put(dev);
743         } else
744                 iface = rcu_dereference(netlbl_unlhsh_def);
745         if (iface == NULL) {
746                 ret_val = -ENOENT;
747                 goto unlhsh_remove_return;
748         }
749         switch (addr_len) {
750         case sizeof(struct in_addr):
751                 ret_val = netlbl_unlhsh_remove_addr4(net,
752                                                      iface, addr, mask,
753                                                      audit_info);
754                 break;
755 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
756         case sizeof(struct in6_addr):
757                 ret_val = netlbl_unlhsh_remove_addr6(net,
758                                                      iface, addr, mask,
759                                                      audit_info);
760                 break;
761 #endif /* IPv6 */
762         default:
763                 ret_val = -EINVAL;
764         }
765         if (ret_val == 0) {
766                 netlbl_unlhsh_condremove_iface(iface);
767                 atomic_dec(&netlabel_mgmt_protocount);
768         }
769
770 unlhsh_remove_return:
771         rcu_read_unlock();
772         return ret_val;
773 }
774
775 /*
776  * General Helper Functions
777  */
778
779 /**
780  * netlbl_unlhsh_netdev_handler - Network device notification handler
781  * @this: notifier block
782  * @event: the event
783  * @ptr: the network device (cast to void)
784  *
785  * Description:
786  * Handle network device events, although at present all we care about is a
787  * network device going away.  In the case of a device going away we clear any
788  * related entries from the unlabeled connection hash table.
789  *
790  */
791 static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
792                                         unsigned long event,
793                                         void *ptr)
794 {
795         struct net_device *dev = ptr;
796         struct netlbl_unlhsh_iface *iface = NULL;
797
798         if (!net_eq(dev_net(dev), &init_net))
799                 return NOTIFY_DONE;
800
801         /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
802         if (event == NETDEV_DOWN) {
803                 spin_lock(&netlbl_unlhsh_lock);
804                 iface = netlbl_unlhsh_search_iface(dev->ifindex);
805                 if (iface != NULL && iface->valid) {
806                         iface->valid = 0;
807                         list_del_rcu(&iface->list);
808                 } else
809                         iface = NULL;
810                 spin_unlock(&netlbl_unlhsh_lock);
811         }
812
813         if (iface != NULL)
814                 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
815
816         return NOTIFY_DONE;
817 }
818
819 /**
820  * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
821  * @value: desired value
822  * @audit_info: NetLabel audit information
823  *
824  * Description:
825  * Set the value of the unlabeled accept flag to @value.
826  *
827  */
828 static void netlbl_unlabel_acceptflg_set(u8 value,
829                                          struct netlbl_audit *audit_info)
830 {
831         struct audit_buffer *audit_buf;
832         u8 old_val;
833
834         old_val = netlabel_unlabel_acceptflg;
835         netlabel_unlabel_acceptflg = value;
836         audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
837                                               audit_info);
838         if (audit_buf != NULL) {
839                 audit_log_format(audit_buf,
840                                  " unlbl_accept=%u old=%u", value, old_val);
841                 audit_log_end(audit_buf);
842         }
843 }
844
845 /**
846  * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
847  * @info: the Generic NETLINK info block
848  * @addr: the IP address
849  * @mask: the IP address mask
850  * @len: the address length
851  *
852  * Description:
853  * Examine the Generic NETLINK message and extract the IP address information.
854  * Returns zero on success, negative values on failure.
855  *
856  */
857 static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
858                                        void **addr,
859                                        void **mask,
860                                        u32 *len)
861 {
862         u32 addr_len;
863
864         if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
865                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
866                 if (addr_len != sizeof(struct in_addr) &&
867                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
868                         return -EINVAL;
869                 *len = addr_len;
870                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
871                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
872                 return 0;
873         } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
874                 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
875                 if (addr_len != sizeof(struct in6_addr) &&
876                     addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
877                         return -EINVAL;
878                 *len = addr_len;
879                 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
880                 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
881                 return 0;
882         }
883
884         return -EINVAL;
885 }
886
887 /*
888  * NetLabel Command Handlers
889  */
890
891 /**
892  * netlbl_unlabel_accept - Handle an ACCEPT message
893  * @skb: the NETLINK buffer
894  * @info: the Generic NETLINK info block
895  *
896  * Description:
897  * Process a user generated ACCEPT message and set the accept flag accordingly.
898  * Returns zero on success, negative values on failure.
899  *
900  */
901 static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
902 {
903         u8 value;
904         struct netlbl_audit audit_info;
905
906         if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
907                 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
908                 if (value == 1 || value == 0) {
909                         netlbl_netlink_auditinfo(skb, &audit_info);
910                         netlbl_unlabel_acceptflg_set(value, &audit_info);
911                         return 0;
912                 }
913         }
914
915         return -EINVAL;
916 }
917
918 /**
919  * netlbl_unlabel_list - Handle a LIST message
920  * @skb: the NETLINK buffer
921  * @info: the Generic NETLINK info block
922  *
923  * Description:
924  * Process a user generated LIST message and respond with the current status.
925  * Returns zero on success, negative values on failure.
926  *
927  */
928 static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
929 {
930         int ret_val = -EINVAL;
931         struct sk_buff *ans_skb;
932         void *data;
933
934         ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
935         if (ans_skb == NULL)
936                 goto list_failure;
937         data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
938                                  0, NLBL_UNLABEL_C_LIST);
939         if (data == NULL) {
940                 ret_val = -ENOMEM;
941                 goto list_failure;
942         }
943
944         ret_val = nla_put_u8(ans_skb,
945                              NLBL_UNLABEL_A_ACPTFLG,
946                              netlabel_unlabel_acceptflg);
947         if (ret_val != 0)
948                 goto list_failure;
949
950         genlmsg_end(ans_skb, data);
951         return genlmsg_reply(ans_skb, info);
952
953 list_failure:
954         kfree_skb(ans_skb);
955         return ret_val;
956 }
957
958 /**
959  * netlbl_unlabel_staticadd - Handle a STATICADD message
960  * @skb: the NETLINK buffer
961  * @info: the Generic NETLINK info block
962  *
963  * Description:
964  * Process a user generated STATICADD message and add a new unlabeled
965  * connection entry to the hash table.  Returns zero on success, negative
966  * values on failure.
967  *
968  */
969 static int netlbl_unlabel_staticadd(struct sk_buff *skb,
970                                     struct genl_info *info)
971 {
972         int ret_val;
973         char *dev_name;
974         void *addr;
975         void *mask;
976         u32 addr_len;
977         u32 secid;
978         struct netlbl_audit audit_info;
979
980         /* Don't allow users to add both IPv4 and IPv6 addresses for a
981          * single entry.  However, allow users to create two entries, one each
982          * for IPv4 and IPv4, with the same LSM security context which should
983          * achieve the same result. */
984         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
985             !info->attrs[NLBL_UNLABEL_A_IFACE] ||
986             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
987                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
988               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
989                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
990                 return -EINVAL;
991
992         netlbl_netlink_auditinfo(skb, &audit_info);
993
994         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
995         if (ret_val != 0)
996                 return ret_val;
997         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
998         ret_val = security_secctx_to_secid(
999                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1000                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1001                                   &secid);
1002         if (ret_val != 0)
1003                 return ret_val;
1004
1005         return netlbl_unlhsh_add(&init_net,
1006                                  dev_name, addr, mask, addr_len, secid,
1007                                  &audit_info);
1008 }
1009
1010 /**
1011  * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
1012  * @skb: the NETLINK buffer
1013  * @info: the Generic NETLINK info block
1014  *
1015  * Description:
1016  * Process a user generated STATICADDDEF message and add a new default
1017  * unlabeled connection entry.  Returns zero on success, negative values on
1018  * failure.
1019  *
1020  */
1021 static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
1022                                        struct genl_info *info)
1023 {
1024         int ret_val;
1025         void *addr;
1026         void *mask;
1027         u32 addr_len;
1028         u32 secid;
1029         struct netlbl_audit audit_info;
1030
1031         /* Don't allow users to add both IPv4 and IPv6 addresses for a
1032          * single entry.  However, allow users to create two entries, one each
1033          * for IPv4 and IPv6, with the same LSM security context which should
1034          * achieve the same result. */
1035         if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
1036             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1037                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1038               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1039                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1040                 return -EINVAL;
1041
1042         netlbl_netlink_auditinfo(skb, &audit_info);
1043
1044         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1045         if (ret_val != 0)
1046                 return ret_val;
1047         ret_val = security_secctx_to_secid(
1048                                   nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1049                                   nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1050                                   &secid);
1051         if (ret_val != 0)
1052                 return ret_val;
1053
1054         return netlbl_unlhsh_add(&init_net,
1055                                  NULL, addr, mask, addr_len, secid,
1056                                  &audit_info);
1057 }
1058
1059 /**
1060  * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
1061  * @skb: the NETLINK buffer
1062  * @info: the Generic NETLINK info block
1063  *
1064  * Description:
1065  * Process a user generated STATICREMOVE message and remove the specified
1066  * unlabeled connection entry.  Returns zero on success, negative values on
1067  * failure.
1068  *
1069  */
1070 static int netlbl_unlabel_staticremove(struct sk_buff *skb,
1071                                        struct genl_info *info)
1072 {
1073         int ret_val;
1074         char *dev_name;
1075         void *addr;
1076         void *mask;
1077         u32 addr_len;
1078         struct netlbl_audit audit_info;
1079
1080         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1081          * IPv4 and IPv6 in the same entry. */
1082         if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
1083             !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1084                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1085               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1086                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1087                 return -EINVAL;
1088
1089         netlbl_netlink_auditinfo(skb, &audit_info);
1090
1091         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1092         if (ret_val != 0)
1093                 return ret_val;
1094         dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1095
1096         return netlbl_unlhsh_remove(&init_net,
1097                                     dev_name, addr, mask, addr_len,
1098                                     &audit_info);
1099 }
1100
1101 /**
1102  * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1103  * @skb: the NETLINK buffer
1104  * @info: the Generic NETLINK info block
1105  *
1106  * Description:
1107  * Process a user generated STATICREMOVEDEF message and remove the default
1108  * unlabeled connection entry.  Returns zero on success, negative values on
1109  * failure.
1110  *
1111  */
1112 static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1113                                           struct genl_info *info)
1114 {
1115         int ret_val;
1116         void *addr;
1117         void *mask;
1118         u32 addr_len;
1119         struct netlbl_audit audit_info;
1120
1121         /* See the note in netlbl_unlabel_staticadd() about not allowing both
1122          * IPv4 and IPv6 in the same entry. */
1123         if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1124                !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1125               (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1126                !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1127                 return -EINVAL;
1128
1129         netlbl_netlink_auditinfo(skb, &audit_info);
1130
1131         ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1132         if (ret_val != 0)
1133                 return ret_val;
1134
1135         return netlbl_unlhsh_remove(&init_net,
1136                                     NULL, addr, mask, addr_len,
1137                                     &audit_info);
1138 }
1139
1140
1141 /**
1142  * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1143  * @cmd: command/message
1144  * @iface: the interface entry
1145  * @addr4: the IPv4 address entry
1146  * @addr6: the IPv6 address entry
1147  * @arg: the netlbl_unlhsh_walk_arg structure
1148  *
1149  * Description:
1150  * This function is designed to be used to generate a response for a
1151  * STATICLIST or STATICLISTDEF message.  When called either @addr4 or @addr6
1152  * can be specified, not both, the other unspecified entry should be set to
1153  * NULL by the caller.  Returns the size of the message on success, negative
1154  * values on failure.
1155  *
1156  */
1157 static int netlbl_unlabel_staticlist_gen(u32 cmd,
1158                                        const struct netlbl_unlhsh_iface *iface,
1159                                        const struct netlbl_unlhsh_addr4 *addr4,
1160                                        const struct netlbl_unlhsh_addr6 *addr6,
1161                                        void *arg)
1162 {
1163         int ret_val = -ENOMEM;
1164         struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1165         struct net_device *dev;
1166         void *data;
1167         u32 secid;
1168         char *secctx;
1169         u32 secctx_len;
1170
1171         data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
1172                            cb_arg->seq, &netlbl_unlabel_gnl_family,
1173                            NLM_F_MULTI, cmd);
1174         if (data == NULL)
1175                 goto list_cb_failure;
1176
1177         if (iface->ifindex > 0) {
1178                 dev = dev_get_by_index(&init_net, iface->ifindex);
1179                 if (!dev) {
1180                         ret_val = -ENODEV;
1181                         goto list_cb_failure;
1182                 }
1183                 ret_val = nla_put_string(cb_arg->skb,
1184                                          NLBL_UNLABEL_A_IFACE, dev->name);
1185                 dev_put(dev);
1186                 if (ret_val != 0)
1187                         goto list_cb_failure;
1188         }
1189
1190         if (addr4) {
1191                 struct in_addr addr_struct;
1192
1193                 addr_struct.s_addr = addr4->list.addr;
1194                 ret_val = nla_put(cb_arg->skb,
1195                                   NLBL_UNLABEL_A_IPV4ADDR,
1196                                   sizeof(struct in_addr),
1197                                   &addr_struct);
1198                 if (ret_val != 0)
1199                         goto list_cb_failure;
1200
1201                 addr_struct.s_addr = addr4->list.mask;
1202                 ret_val = nla_put(cb_arg->skb,
1203                                   NLBL_UNLABEL_A_IPV4MASK,
1204                                   sizeof(struct in_addr),
1205                                   &addr_struct);
1206                 if (ret_val != 0)
1207                         goto list_cb_failure;
1208
1209                 secid = addr4->secid;
1210         } else {
1211                 ret_val = nla_put(cb_arg->skb,
1212                                   NLBL_UNLABEL_A_IPV6ADDR,
1213                                   sizeof(struct in6_addr),
1214                                   &addr6->list.addr);
1215                 if (ret_val != 0)
1216                         goto list_cb_failure;
1217
1218                 ret_val = nla_put(cb_arg->skb,
1219                                   NLBL_UNLABEL_A_IPV6MASK,
1220                                   sizeof(struct in6_addr),
1221                                   &addr6->list.mask);
1222                 if (ret_val != 0)
1223                         goto list_cb_failure;
1224
1225                 secid = addr6->secid;
1226         }
1227
1228         ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
1229         if (ret_val != 0)
1230                 goto list_cb_failure;
1231         ret_val = nla_put(cb_arg->skb,
1232                           NLBL_UNLABEL_A_SECCTX,
1233                           secctx_len,
1234                           secctx);
1235         security_release_secctx(secctx, secctx_len);
1236         if (ret_val != 0)
1237                 goto list_cb_failure;
1238
1239         cb_arg->seq++;
1240         return genlmsg_end(cb_arg->skb, data);
1241
1242 list_cb_failure:
1243         genlmsg_cancel(cb_arg->skb, data);
1244         return ret_val;
1245 }
1246
1247 /**
1248  * netlbl_unlabel_staticlist - Handle a STATICLIST message
1249  * @skb: the NETLINK buffer
1250  * @cb: the NETLINK callback
1251  *
1252  * Description:
1253  * Process a user generated STATICLIST message and dump the unlabeled
1254  * connection hash table in a form suitable for use in a kernel generated
1255  * STATICLIST message.  Returns the length of @skb.
1256  *
1257  */
1258 static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1259                                      struct netlink_callback *cb)
1260 {
1261         struct netlbl_unlhsh_walk_arg cb_arg;
1262         u32 skip_bkt = cb->args[0];
1263         u32 skip_chain = cb->args[1];
1264         u32 skip_addr4 = cb->args[2];
1265         u32 skip_addr6 = cb->args[3];
1266         u32 iter_bkt;
1267         u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1268         struct netlbl_unlhsh_iface *iface;
1269         struct list_head *iter_list;
1270         struct netlbl_af4list *addr4;
1271 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1272         struct netlbl_af6list *addr6;
1273 #endif
1274
1275         cb_arg.nl_cb = cb;
1276         cb_arg.skb = skb;
1277         cb_arg.seq = cb->nlh->nlmsg_seq;
1278
1279         rcu_read_lock();
1280         for (iter_bkt = skip_bkt;
1281              iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1282              iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
1283                 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
1284                 list_for_each_entry_rcu(iface, iter_list, list) {
1285                         if (!iface->valid ||
1286                             iter_chain++ < skip_chain)
1287                                 continue;
1288                         netlbl_af4list_foreach_rcu(addr4,
1289                                                    &iface->addr4_list) {
1290                                 if (iter_addr4++ < skip_addr4)
1291                                         continue;
1292                                 if (netlbl_unlabel_staticlist_gen(
1293                                               NLBL_UNLABEL_C_STATICLIST,
1294                                               iface,
1295                                               netlbl_unlhsh_addr4_entry(addr4),
1296                                               NULL,
1297                                               &cb_arg) < 0) {
1298                                         iter_addr4--;
1299                                         iter_chain--;
1300                                         goto unlabel_staticlist_return;
1301                                 }
1302                         }
1303 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1304                         netlbl_af6list_foreach_rcu(addr6,
1305                                                    &iface->addr6_list) {
1306                                 if (iter_addr6++ < skip_addr6)
1307                                         continue;
1308                                 if (netlbl_unlabel_staticlist_gen(
1309                                               NLBL_UNLABEL_C_STATICLIST,
1310                                               iface,
1311                                               NULL,
1312                                               netlbl_unlhsh_addr6_entry(addr6),
1313                                               &cb_arg) < 0) {
1314                                         iter_addr6--;
1315                                         iter_chain--;
1316                                         goto unlabel_staticlist_return;
1317                                 }
1318                         }
1319 #endif /* IPv6 */
1320                 }
1321         }
1322
1323 unlabel_staticlist_return:
1324         rcu_read_unlock();
1325         cb->args[0] = skip_bkt;
1326         cb->args[1] = skip_chain;
1327         cb->args[2] = skip_addr4;
1328         cb->args[3] = skip_addr6;
1329         return skb->len;
1330 }
1331
1332 /**
1333  * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1334  * @skb: the NETLINK buffer
1335  * @cb: the NETLINK callback
1336  *
1337  * Description:
1338  * Process a user generated STATICLISTDEF message and dump the default
1339  * unlabeled connection entry in a form suitable for use in a kernel generated
1340  * STATICLISTDEF message.  Returns the length of @skb.
1341  *
1342  */
1343 static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1344                                         struct netlink_callback *cb)
1345 {
1346         struct netlbl_unlhsh_walk_arg cb_arg;
1347         struct netlbl_unlhsh_iface *iface;
1348         u32 skip_addr4 = cb->args[0];
1349         u32 skip_addr6 = cb->args[1];
1350         u32 iter_addr4 = 0;
1351         struct netlbl_af4list *addr4;
1352 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1353         u32 iter_addr6 = 0;
1354         struct netlbl_af6list *addr6;
1355 #endif
1356
1357         cb_arg.nl_cb = cb;
1358         cb_arg.skb = skb;
1359         cb_arg.seq = cb->nlh->nlmsg_seq;
1360
1361         rcu_read_lock();
1362         iface = rcu_dereference(netlbl_unlhsh_def);
1363         if (iface == NULL || !iface->valid)
1364                 goto unlabel_staticlistdef_return;
1365
1366         netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
1367                 if (iter_addr4++ < skip_addr4)
1368                         continue;
1369                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1370                                               iface,
1371                                               netlbl_unlhsh_addr4_entry(addr4),
1372                                               NULL,
1373                                               &cb_arg) < 0) {
1374                         iter_addr4--;
1375                         goto unlabel_staticlistdef_return;
1376                 }
1377         }
1378 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1379         netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
1380                 if (iter_addr6++ < skip_addr6)
1381                         continue;
1382                 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1383                                               iface,
1384                                               NULL,
1385                                               netlbl_unlhsh_addr6_entry(addr6),
1386                                               &cb_arg) < 0) {
1387                         iter_addr6--;
1388                         goto unlabel_staticlistdef_return;
1389                 }
1390         }
1391 #endif /* IPv6 */
1392
1393 unlabel_staticlistdef_return:
1394         rcu_read_unlock();
1395         cb->args[0] = skip_addr4;
1396         cb->args[1] = skip_addr6;
1397         return skb->len;
1398 }
1399
1400 /*
1401  * NetLabel Generic NETLINK Command Definitions
1402  */
1403
1404 static struct genl_ops netlbl_unlabel_genl_ops[] = {
1405         {
1406         .cmd = NLBL_UNLABEL_C_STATICADD,
1407         .flags = GENL_ADMIN_PERM,
1408         .policy = netlbl_unlabel_genl_policy,
1409         .doit = netlbl_unlabel_staticadd,
1410         .dumpit = NULL,
1411         },
1412         {
1413         .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1414         .flags = GENL_ADMIN_PERM,
1415         .policy = netlbl_unlabel_genl_policy,
1416         .doit = netlbl_unlabel_staticremove,
1417         .dumpit = NULL,
1418         },
1419         {
1420         .cmd = NLBL_UNLABEL_C_STATICLIST,
1421         .flags = 0,
1422         .policy = netlbl_unlabel_genl_policy,
1423         .doit = NULL,
1424         .dumpit = netlbl_unlabel_staticlist,
1425         },
1426         {
1427         .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1428         .flags = GENL_ADMIN_PERM,
1429         .policy = netlbl_unlabel_genl_policy,
1430         .doit = netlbl_unlabel_staticadddef,
1431         .dumpit = NULL,
1432         },
1433         {
1434         .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1435         .flags = GENL_ADMIN_PERM,
1436         .policy = netlbl_unlabel_genl_policy,
1437         .doit = netlbl_unlabel_staticremovedef,
1438         .dumpit = NULL,
1439         },
1440         {
1441         .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1442         .flags = 0,
1443         .policy = netlbl_unlabel_genl_policy,
1444         .doit = NULL,
1445         .dumpit = netlbl_unlabel_staticlistdef,
1446         },
1447         {
1448         .cmd = NLBL_UNLABEL_C_ACCEPT,
1449         .flags = GENL_ADMIN_PERM,
1450         .policy = netlbl_unlabel_genl_policy,
1451         .doit = netlbl_unlabel_accept,
1452         .dumpit = NULL,
1453         },
1454         {
1455         .cmd = NLBL_UNLABEL_C_LIST,
1456         .flags = 0,
1457         .policy = netlbl_unlabel_genl_policy,
1458         .doit = netlbl_unlabel_list,
1459         .dumpit = NULL,
1460         },
1461 };
1462
1463 /*
1464  * NetLabel Generic NETLINK Protocol Functions
1465  */
1466
1467 /**
1468  * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
1469  *
1470  * Description:
1471  * Register the unlabeled packet NetLabel component with the Generic NETLINK
1472  * mechanism.  Returns zero on success, negative values on failure.
1473  *
1474  */
1475 int __init netlbl_unlabel_genl_init(void)
1476 {
1477         int ret_val, i;
1478
1479         ret_val = genl_register_family(&netlbl_unlabel_gnl_family);
1480         if (ret_val != 0)
1481                 return ret_val;
1482
1483         for (i = 0; i < ARRAY_SIZE(netlbl_unlabel_genl_ops); i++) {
1484                 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
1485                                 &netlbl_unlabel_genl_ops[i]);
1486                 if (ret_val != 0)
1487                         return ret_val;
1488         }
1489
1490         return 0;
1491 }
1492
1493 /*
1494  * NetLabel KAPI Hooks
1495  */
1496
1497 static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1498         .notifier_call = netlbl_unlhsh_netdev_handler,
1499 };
1500
1501 /**
1502  * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1503  * @size: the number of bits to use for the hash buckets
1504  *
1505  * Description:
1506  * Initializes the unlabeled connection hash table and registers a network
1507  * device notification handler.  This function should only be called by the
1508  * NetLabel subsystem itself during initialization.  Returns zero on success,
1509  * non-zero values on error.
1510  *
1511  */
1512 int __init netlbl_unlabel_init(u32 size)
1513 {
1514         u32 iter;
1515         struct netlbl_unlhsh_tbl *hsh_tbl;
1516
1517         if (size == 0)
1518                 return -EINVAL;
1519
1520         hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1521         if (hsh_tbl == NULL)
1522                 return -ENOMEM;
1523         hsh_tbl->size = 1 << size;
1524         hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1525                                sizeof(struct list_head),
1526                                GFP_KERNEL);
1527         if (hsh_tbl->tbl == NULL) {
1528                 kfree(hsh_tbl);
1529                 return -ENOMEM;
1530         }
1531         for (iter = 0; iter < hsh_tbl->size; iter++)
1532                 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
1533
1534         rcu_read_lock();
1535         spin_lock(&netlbl_unlhsh_lock);
1536         rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1537         spin_unlock(&netlbl_unlhsh_lock);
1538         rcu_read_unlock();
1539
1540         register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
1541
1542         return 0;
1543 }
1544
1545 /**
1546  * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1547  * @skb: the packet
1548  * @family: protocol family
1549  * @secattr: the security attributes
1550  *
1551  * Description:
1552  * Determine the security attributes, if any, for an unlabled packet and return
1553  * them in @secattr.  Returns zero on success and negative values on failure.
1554  *
1555  */
1556 int netlbl_unlabel_getattr(const struct sk_buff *skb,
1557                            u16 family,
1558                            struct netlbl_lsm_secattr *secattr)
1559 {
1560         struct netlbl_unlhsh_iface *iface;
1561
1562         rcu_read_lock();
1563         iface = netlbl_unlhsh_search_iface_def(skb->iif);
1564         if (iface == NULL)
1565                 goto unlabel_getattr_nolabel;
1566         switch (family) {
1567         case PF_INET: {
1568                 struct iphdr *hdr4;
1569                 struct netlbl_af4list *addr4;
1570
1571                 hdr4 = ip_hdr(skb);
1572                 addr4 = netlbl_af4list_search(hdr4->saddr,
1573                                               &iface->addr4_list);
1574                 if (addr4 == NULL)
1575                         goto unlabel_getattr_nolabel;
1576                 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
1577                 break;
1578         }
1579 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1580         case PF_INET6: {
1581                 struct ipv6hdr *hdr6;
1582                 struct netlbl_af6list *addr6;
1583
1584                 hdr6 = ipv6_hdr(skb);
1585                 addr6 = netlbl_af6list_search(&hdr6->saddr,
1586                                               &iface->addr6_list);
1587                 if (addr6 == NULL)
1588                         goto unlabel_getattr_nolabel;
1589                 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
1590                 break;
1591         }
1592 #endif /* IPv6 */
1593         default:
1594                 goto unlabel_getattr_nolabel;
1595         }
1596         rcu_read_unlock();
1597
1598         secattr->flags |= NETLBL_SECATTR_SECID;
1599         secattr->type = NETLBL_NLTYPE_UNLABELED;
1600         return 0;
1601
1602 unlabel_getattr_nolabel:
1603         rcu_read_unlock();
1604         if (netlabel_unlabel_acceptflg == 0)
1605                 return -ENOMSG;
1606         secattr->type = NETLBL_NLTYPE_UNLABELED;
1607         return 0;
1608 }
1609
1610 /**
1611  * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
1612  *
1613  * Description:
1614  * Set the default NetLabel configuration to allow incoming unlabeled packets
1615  * and to send unlabeled network traffic by default.
1616  *
1617  */
1618 int __init netlbl_unlabel_defconf(void)
1619 {
1620         int ret_val;
1621         struct netlbl_dom_map *entry;
1622         struct netlbl_audit audit_info;
1623
1624         /* Only the kernel is allowed to call this function and the only time
1625          * it is called is at bootup before the audit subsystem is reporting
1626          * messages so don't worry to much about these values. */
1627         security_task_getsecid(current, &audit_info.secid);
1628         audit_info.loginuid = 0;
1629         audit_info.sessionid = 0;
1630
1631         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1632         if (entry == NULL)
1633                 return -ENOMEM;
1634         entry->type = NETLBL_NLTYPE_UNLABELED;
1635         ret_val = netlbl_domhsh_add_default(entry, &audit_info);
1636         if (ret_val != 0)
1637                 return ret_val;
1638
1639         netlbl_unlabel_acceptflg_set(1, &audit_info);
1640
1641         return 0;
1642 }