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96cb8e33 PM |
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 | /* | |
61e10682 | 13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008 |
96cb8e33 PM |
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> | |
8cc44579 | 32 | #include <linux/rcupdate.h> |
96cb8e33 PM |
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> | |
de64688f | 38 | #include <linux/audit.h> |
8cc44579 PM |
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> | |
5a0e3ad6 | 46 | #include <linux/slab.h> |
96cb8e33 PM |
47 | #include <net/sock.h> |
48 | #include <net/netlink.h> | |
49 | #include <net/genetlink.h> | |
8cc44579 PM |
50 | #include <net/ip.h> |
51 | #include <net/ipv6.h> | |
52 | #include <net/net_namespace.h> | |
96cb8e33 PM |
53 | #include <net/netlabel.h> |
54 | #include <asm/bug.h> | |
8cc44579 | 55 | #include <asm/atomic.h> |
96cb8e33 PM |
56 | |
57 | #include "netlabel_user.h" | |
61e10682 | 58 | #include "netlabel_addrlist.h" |
96cb8e33 PM |
59 | #include "netlabel_domainhash.h" |
60 | #include "netlabel_unlabeled.h" | |
8cc44579 PM |
61 | #include "netlabel_mgmt.h" |
62 | ||
63 | /* NOTE: at present we always use init's network namespace since we don't | |
64 | * presently support different namespaces even though the majority of | |
65 | * the functions in this file are "namespace safe" */ | |
66 | ||
67 | /* The unlabeled connection hash table which we use to map network interfaces | |
68 | * and addresses of unlabeled packets to a user specified secid value for the | |
69 | * LSM. The hash table is used to lookup the network interface entry | |
70 | * (struct netlbl_unlhsh_iface) and then the interface entry is used to | |
71 | * lookup an IP address match from an ordered list. If a network interface | |
72 | * match can not be found in the hash table then the default entry | |
73 | * (netlbl_unlhsh_def) is used. The IP address entry list | |
74 | * (struct netlbl_unlhsh_addr) is ordered such that the entries with a | |
75 | * larger netmask come first. | |
76 | */ | |
77 | struct netlbl_unlhsh_tbl { | |
78 | struct list_head *tbl; | |
79 | u32 size; | |
80 | }; | |
61e10682 PM |
81 | #define netlbl_unlhsh_addr4_entry(iter) \ |
82 | container_of(iter, struct netlbl_unlhsh_addr4, list) | |
8cc44579 | 83 | struct netlbl_unlhsh_addr4 { |
8cc44579 PM |
84 | u32 secid; |
85 | ||
61e10682 | 86 | struct netlbl_af4list list; |
8cc44579 PM |
87 | struct rcu_head rcu; |
88 | }; | |
61e10682 PM |
89 | #define netlbl_unlhsh_addr6_entry(iter) \ |
90 | container_of(iter, struct netlbl_unlhsh_addr6, list) | |
8cc44579 | 91 | struct netlbl_unlhsh_addr6 { |
8cc44579 PM |
92 | u32 secid; |
93 | ||
61e10682 | 94 | struct netlbl_af6list list; |
8cc44579 PM |
95 | struct rcu_head rcu; |
96 | }; | |
97 | struct netlbl_unlhsh_iface { | |
98 | int ifindex; | |
99 | struct list_head addr4_list; | |
100 | struct list_head addr6_list; | |
101 | ||
102 | u32 valid; | |
103 | struct list_head list; | |
104 | struct rcu_head rcu; | |
105 | }; | |
106 | ||
107 | /* Argument struct for netlbl_unlhsh_walk() */ | |
108 | struct netlbl_unlhsh_walk_arg { | |
109 | struct netlink_callback *nl_cb; | |
110 | struct sk_buff *skb; | |
111 | u32 seq; | |
112 | }; | |
113 | ||
114 | /* Unlabeled connection hash table */ | |
115 | /* updates should be so rare that having one spinlock for the entire | |
116 | * hash table should be okay */ | |
117 | static DEFINE_SPINLOCK(netlbl_unlhsh_lock); | |
118 | static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL; | |
119 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL; | |
96cb8e33 PM |
120 | |
121 | /* Accept unlabeled packets flag */ | |
cd28786d | 122 | static u8 netlabel_unlabel_acceptflg = 0; |
96cb8e33 | 123 | |
8cc44579 | 124 | /* NetLabel Generic NETLINK unlabeled family */ |
96cb8e33 PM |
125 | static struct genl_family netlbl_unlabel_gnl_family = { |
126 | .id = GENL_ID_GENERATE, | |
127 | .hdrsize = 0, | |
128 | .name = NETLBL_NLTYPE_UNLABELED_NAME, | |
129 | .version = NETLBL_PROTO_VERSION, | |
fd385855 | 130 | .maxattr = NLBL_UNLABEL_A_MAX, |
96cb8e33 PM |
131 | }; |
132 | ||
fd385855 | 133 | /* NetLabel Netlink attribute policy */ |
ef7c79ed | 134 | static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
fd385855 | 135 | [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
8cc44579 PM |
136 | [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY, |
137 | .len = sizeof(struct in6_addr) }, | |
138 | [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY, | |
139 | .len = sizeof(struct in6_addr) }, | |
140 | [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY, | |
141 | .len = sizeof(struct in_addr) }, | |
142 | [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY, | |
143 | .len = sizeof(struct in_addr) }, | |
144 | [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING, | |
145 | .len = IFNAMSIZ - 1 }, | |
146 | [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY } | |
fd385855 | 147 | }; |
96cb8e33 | 148 | |
32f50cde | 149 | /* |
8cc44579 PM |
150 | * Unlabeled Connection Hash Table Functions |
151 | */ | |
152 | ||
153 | /** | |
154 | * netlbl_unlhsh_free_addr4 - Frees an IPv4 address entry from the hash table | |
155 | * @entry: the entry's RCU field | |
156 | * | |
157 | * Description: | |
158 | * This function is designed to be used as a callback to the call_rcu() | |
159 | * function so that memory allocated to a hash table address entry can be | |
160 | * released safely. | |
161 | * | |
162 | */ | |
163 | static void netlbl_unlhsh_free_addr4(struct rcu_head *entry) | |
164 | { | |
165 | struct netlbl_unlhsh_addr4 *ptr; | |
166 | ||
167 | ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu); | |
168 | kfree(ptr); | |
169 | } | |
170 | ||
171 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
172 | /** | |
173 | * netlbl_unlhsh_free_addr6 - Frees an IPv6 address entry from the hash table | |
174 | * @entry: the entry's RCU field | |
175 | * | |
176 | * Description: | |
177 | * This function is designed to be used as a callback to the call_rcu() | |
178 | * function so that memory allocated to a hash table address entry can be | |
179 | * released safely. | |
180 | * | |
181 | */ | |
182 | static void netlbl_unlhsh_free_addr6(struct rcu_head *entry) | |
183 | { | |
184 | struct netlbl_unlhsh_addr6 *ptr; | |
185 | ||
186 | ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu); | |
187 | kfree(ptr); | |
188 | } | |
189 | #endif /* IPv6 */ | |
190 | ||
191 | /** | |
192 | * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table | |
193 | * @entry: the entry's RCU field | |
194 | * | |
195 | * Description: | |
196 | * This function is designed to be used as a callback to the call_rcu() | |
197 | * function so that memory allocated to a hash table interface entry can be | |
198 | * released safely. It is important to note that this function does not free | |
199 | * the IPv4 and IPv6 address lists contained as part of an interface entry. It | |
200 | * is up to the rest of the code to make sure an interface entry is only freed | |
201 | * once it's address lists are empty. | |
202 | * | |
203 | */ | |
204 | static void netlbl_unlhsh_free_iface(struct rcu_head *entry) | |
205 | { | |
206 | struct netlbl_unlhsh_iface *iface; | |
61e10682 PM |
207 | struct netlbl_af4list *iter4; |
208 | struct netlbl_af4list *tmp4; | |
209 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
210 | struct netlbl_af6list *iter6; | |
211 | struct netlbl_af6list *tmp6; | |
212 | #endif /* IPv6 */ | |
8cc44579 PM |
213 | |
214 | iface = container_of(entry, struct netlbl_unlhsh_iface, rcu); | |
215 | ||
216 | /* no need for locks here since we are the only one with access to this | |
217 | * structure */ | |
218 | ||
61e10682 PM |
219 | netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) { |
220 | netlbl_af4list_remove_entry(iter4); | |
221 | kfree(netlbl_unlhsh_addr4_entry(iter4)); | |
222 | } | |
223 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
224 | netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) { | |
225 | netlbl_af6list_remove_entry(iter6); | |
226 | kfree(netlbl_unlhsh_addr6_entry(iter6)); | |
227 | } | |
228 | #endif /* IPv6 */ | |
8cc44579 PM |
229 | kfree(iface); |
230 | } | |
231 | ||
232 | /** | |
233 | * netlbl_unlhsh_hash - Hashing function for the hash table | |
234 | * @ifindex: the network interface/device to hash | |
235 | * | |
236 | * Description: | |
237 | * This is the hashing function for the unlabeled hash table, it returns the | |
238 | * bucket number for the given device/interface. The caller is responsible for | |
239 | * calling the rcu_read_[un]lock() functions. | |
240 | * | |
241 | */ | |
242 | static u32 netlbl_unlhsh_hash(int ifindex) | |
243 | { | |
244 | /* this is taken _almost_ directly from | |
245 | * security/selinux/netif.c:sel_netif_hasfn() as they do pretty much | |
246 | * the same thing */ | |
247 | return ifindex & (rcu_dereference(netlbl_unlhsh)->size - 1); | |
248 | } | |
249 | ||
8cc44579 PM |
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 calling the rcu_read_[un]lock() functions. | |
258 | * | |
259 | */ | |
260 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex) | |
261 | { | |
262 | u32 bkt; | |
56196701 | 263 | struct list_head *bkt_list; |
8cc44579 PM |
264 | struct netlbl_unlhsh_iface *iter; |
265 | ||
266 | bkt = netlbl_unlhsh_hash(ifindex); | |
56196701 PM |
267 | bkt_list = &rcu_dereference(netlbl_unlhsh)->tbl[bkt]; |
268 | list_for_each_entry_rcu(iter, bkt_list, list) | |
8cc44579 PM |
269 | if (iter->valid && iter->ifindex == ifindex) |
270 | return iter; | |
271 | ||
272 | return NULL; | |
273 | } | |
274 | ||
275 | /** | |
276 | * netlbl_unlhsh_search_iface_def - Search for a matching interface entry | |
277 | * @ifindex: the network interface | |
278 | * | |
279 | * Description: | |
280 | * Searches the unlabeled connection hash table and returns a pointer to the | |
281 | * interface entry which matches @ifindex. If an exact match can not be found | |
282 | * and there is a valid default entry, the default entry is returned, otherwise | |
283 | * NULL is returned. The caller is responsible for calling the | |
284 | * rcu_read_[un]lock() functions. | |
285 | * | |
286 | */ | |
287 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface_def(int ifindex) | |
288 | { | |
289 | struct netlbl_unlhsh_iface *entry; | |
290 | ||
291 | entry = netlbl_unlhsh_search_iface(ifindex); | |
292 | if (entry != NULL) | |
293 | return entry; | |
294 | ||
295 | entry = rcu_dereference(netlbl_unlhsh_def); | |
296 | if (entry != NULL && entry->valid) | |
297 | return entry; | |
298 | ||
299 | return NULL; | |
300 | } | |
301 | ||
302 | /** | |
303 | * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table | |
304 | * @iface: the associated interface entry | |
305 | * @addr: IPv4 address in network byte order | |
306 | * @mask: IPv4 address mask in network byte order | |
307 | * @secid: LSM secid value for entry | |
308 | * | |
309 | * Description: | |
310 | * Add a new address entry into the unlabeled connection hash table using the | |
311 | * interface entry specified by @iface. On success zero is returned, otherwise | |
312 | * a negative value is returned. The caller is responsible for calling the | |
313 | * rcu_read_[un]lock() functions. | |
314 | * | |
32f50cde | 315 | */ |
8cc44579 PM |
316 | static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, |
317 | const struct in_addr *addr, | |
318 | const struct in_addr *mask, | |
319 | u32 secid) | |
320 | { | |
61e10682 | 321 | int ret_val; |
8cc44579 | 322 | struct netlbl_unlhsh_addr4 *entry; |
8cc44579 PM |
323 | |
324 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
325 | if (entry == NULL) | |
326 | return -ENOMEM; | |
327 | ||
61e10682 PM |
328 | entry->list.addr = addr->s_addr & mask->s_addr; |
329 | entry->list.mask = mask->s_addr; | |
330 | entry->list.valid = 1; | |
61e10682 | 331 | entry->secid = secid; |
8cc44579 PM |
332 | |
333 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 334 | ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); |
8cc44579 | 335 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
336 | |
337 | if (ret_val != 0) | |
338 | kfree(entry); | |
339 | return ret_val; | |
8cc44579 PM |
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 | { | |
61e10682 | 362 | int ret_val; |
8cc44579 | 363 | struct netlbl_unlhsh_addr6 *entry; |
8cc44579 PM |
364 | |
365 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
366 | if (entry == NULL) | |
367 | return -ENOMEM; | |
368 | ||
61e10682 PM |
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; | |
61e10682 | 376 | entry->secid = secid; |
8cc44579 PM |
377 | |
378 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 379 | ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); |
8cc44579 | 380 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
381 | |
382 | if (ret_val != 0) | |
383 | kfree(entry); | |
8cc44579 PM |
384 | return 0; |
385 | } | |
386 | #endif /* IPv6 */ | |
387 | ||
388 | /** | |
389 | * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table | |
390 | * @ifindex: network interface | |
391 | * | |
392 | * Description: | |
393 | * Add a new, empty, interface entry into the unlabeled connection hash table. | |
394 | * On success a pointer to the new interface entry is returned, on failure NULL | |
395 | * is returned. The caller is responsible for calling the rcu_read_[un]lock() | |
396 | * functions. | |
397 | * | |
398 | */ | |
399 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) | |
400 | { | |
401 | u32 bkt; | |
402 | struct netlbl_unlhsh_iface *iface; | |
403 | ||
404 | iface = kzalloc(sizeof(*iface), GFP_ATOMIC); | |
405 | if (iface == NULL) | |
406 | return NULL; | |
407 | ||
408 | iface->ifindex = ifindex; | |
409 | INIT_LIST_HEAD(&iface->addr4_list); | |
410 | INIT_LIST_HEAD(&iface->addr6_list); | |
411 | iface->valid = 1; | |
8cc44579 PM |
412 | |
413 | spin_lock(&netlbl_unlhsh_lock); | |
414 | if (ifindex > 0) { | |
415 | bkt = netlbl_unlhsh_hash(ifindex); | |
416 | if (netlbl_unlhsh_search_iface(ifindex) != NULL) | |
417 | goto add_iface_failure; | |
418 | list_add_tail_rcu(&iface->list, | |
419 | &rcu_dereference(netlbl_unlhsh)->tbl[bkt]); | |
420 | } else { | |
421 | INIT_LIST_HEAD(&iface->list); | |
422 | if (rcu_dereference(netlbl_unlhsh_def) != NULL) | |
423 | goto add_iface_failure; | |
424 | rcu_assign_pointer(netlbl_unlhsh_def, iface); | |
425 | } | |
426 | spin_unlock(&netlbl_unlhsh_lock); | |
427 | ||
428 | return iface; | |
429 | ||
430 | add_iface_failure: | |
431 | spin_unlock(&netlbl_unlhsh_lock); | |
432 | kfree(iface); | |
433 | return NULL; | |
434 | } | |
435 | ||
436 | /** | |
437 | * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table | |
438 | * @net: network namespace | |
439 | * @dev_name: interface name | |
440 | * @addr: IP address in network byte order | |
441 | * @mask: address mask in network byte order | |
442 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
443 | * @secid: LSM secid value for the entry | |
13541b3a | 444 | * @audit_info: NetLabel audit information |
8cc44579 PM |
445 | * |
446 | * Description: | |
447 | * Adds a new entry to the unlabeled connection hash table. Returns zero on | |
448 | * success, negative values on failure. | |
449 | * | |
450 | */ | |
6c2e8ac0 PM |
451 | int netlbl_unlhsh_add(struct net *net, |
452 | const char *dev_name, | |
453 | const void *addr, | |
454 | const void *mask, | |
455 | u32 addr_len, | |
456 | u32 secid, | |
457 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
458 | { |
459 | int ret_val; | |
460 | int ifindex; | |
461 | struct net_device *dev; | |
462 | struct netlbl_unlhsh_iface *iface; | |
13541b3a PM |
463 | struct audit_buffer *audit_buf = NULL; |
464 | char *secctx = NULL; | |
465 | u32 secctx_len; | |
8cc44579 PM |
466 | |
467 | if (addr_len != sizeof(struct in_addr) && | |
468 | addr_len != sizeof(struct in6_addr)) | |
469 | return -EINVAL; | |
470 | ||
471 | rcu_read_lock(); | |
472 | if (dev_name != NULL) { | |
122ec6ff | 473 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
474 | if (dev == NULL) { |
475 | ret_val = -ENODEV; | |
476 | goto unlhsh_add_return; | |
477 | } | |
478 | ifindex = dev->ifindex; | |
8cc44579 PM |
479 | iface = netlbl_unlhsh_search_iface(ifindex); |
480 | } else { | |
481 | ifindex = 0; | |
482 | iface = rcu_dereference(netlbl_unlhsh_def); | |
483 | } | |
484 | if (iface == NULL) { | |
485 | iface = netlbl_unlhsh_add_iface(ifindex); | |
486 | if (iface == NULL) { | |
487 | ret_val = -ENOMEM; | |
488 | goto unlhsh_add_return; | |
489 | } | |
490 | } | |
13541b3a PM |
491 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, |
492 | audit_info); | |
8cc44579 | 493 | switch (addr_len) { |
56628b1d PE |
494 | case sizeof(struct in_addr): { |
495 | struct in_addr *addr4, *mask4; | |
496 | ||
13541b3a PM |
497 | addr4 = (struct in_addr *)addr; |
498 | mask4 = (struct in_addr *)mask; | |
499 | ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); | |
500 | if (audit_buf != NULL) | |
63c41688 PM |
501 | netlbl_af4list_audit_addr(audit_buf, 1, |
502 | dev_name, | |
503 | addr4->s_addr, | |
504 | mask4->s_addr); | |
8cc44579 | 505 | break; |
56628b1d | 506 | } |
8cc44579 | 507 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
56628b1d PE |
508 | case sizeof(struct in6_addr): { |
509 | struct in6_addr *addr6, *mask6; | |
510 | ||
13541b3a PM |
511 | addr6 = (struct in6_addr *)addr; |
512 | mask6 = (struct in6_addr *)mask; | |
513 | ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); | |
514 | if (audit_buf != NULL) | |
63c41688 PM |
515 | netlbl_af6list_audit_addr(audit_buf, 1, |
516 | dev_name, | |
517 | addr6, mask6); | |
8cc44579 | 518 | break; |
56628b1d | 519 | } |
8cc44579 PM |
520 | #endif /* IPv6 */ |
521 | default: | |
522 | ret_val = -EINVAL; | |
523 | } | |
524 | if (ret_val == 0) | |
525 | atomic_inc(&netlabel_mgmt_protocount); | |
526 | ||
527 | unlhsh_add_return: | |
528 | rcu_read_unlock(); | |
13541b3a PM |
529 | if (audit_buf != NULL) { |
530 | if (security_secid_to_secctx(secid, | |
531 | &secctx, | |
532 | &secctx_len) == 0) { | |
533 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
534 | security_release_secctx(secctx, secctx_len); | |
535 | } | |
536 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
537 | audit_log_end(audit_buf); | |
538 | } | |
8cc44579 PM |
539 | return ret_val; |
540 | } | |
541 | ||
542 | /** | |
543 | * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry | |
13541b3a | 544 | * @net: network namespace |
8cc44579 PM |
545 | * @iface: interface entry |
546 | * @addr: IP address | |
547 | * @mask: IP address mask | |
13541b3a | 548 | * @audit_info: NetLabel audit information |
8cc44579 PM |
549 | * |
550 | * Description: | |
551 | * Remove an IP address entry from the unlabeled connection hash table. | |
552 | * Returns zero on success, negative values on failure. The caller is | |
553 | * responsible for calling the rcu_read_[un]lock() functions. | |
554 | * | |
555 | */ | |
13541b3a PM |
556 | static int netlbl_unlhsh_remove_addr4(struct net *net, |
557 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 558 | const struct in_addr *addr, |
13541b3a PM |
559 | const struct in_addr *mask, |
560 | struct netlbl_audit *audit_info) | |
8cc44579 | 561 | { |
61e10682 | 562 | struct netlbl_af4list *list_entry; |
8cc44579 | 563 | struct netlbl_unlhsh_addr4 *entry; |
61e10682 | 564 | struct audit_buffer *audit_buf; |
13541b3a | 565 | struct net_device *dev; |
61e10682 | 566 | char *secctx; |
13541b3a | 567 | u32 secctx_len; |
8cc44579 PM |
568 | |
569 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
570 | list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, |
571 | &iface->addr4_list); | |
8cc44579 | 572 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
573 | if (list_entry != NULL) |
574 | entry = netlbl_unlhsh_addr4_entry(list_entry); | |
575 | else | |
ec8f2375 | 576 | entry = NULL; |
8cc44579 | 577 | |
13541b3a PM |
578 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
579 | audit_info); | |
580 | if (audit_buf != NULL) { | |
581 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
582 | netlbl_af4list_audit_addr(audit_buf, 1, |
583 | (dev != NULL ? dev->name : NULL), | |
584 | addr->s_addr, mask->s_addr); | |
13541b3a PM |
585 | if (dev != NULL) |
586 | dev_put(dev); | |
ec8f2375 PM |
587 | if (entry != NULL && |
588 | security_secid_to_secctx(entry->secid, | |
589 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
590 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
591 | security_release_secctx(secctx, secctx_len); | |
592 | } | |
ec8f2375 | 593 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
594 | audit_log_end(audit_buf); |
595 | } | |
596 | ||
ec8f2375 PM |
597 | if (entry == NULL) |
598 | return -ENOENT; | |
599 | ||
600 | call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4); | |
601 | return 0; | |
8cc44579 PM |
602 | } |
603 | ||
604 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
605 | /** | |
606 | * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry | |
13541b3a | 607 | * @net: network namespace |
8cc44579 PM |
608 | * @iface: interface entry |
609 | * @addr: IP address | |
610 | * @mask: IP address mask | |
13541b3a | 611 | * @audit_info: NetLabel audit information |
8cc44579 PM |
612 | * |
613 | * Description: | |
614 | * Remove an IP address entry from the unlabeled connection hash table. | |
615 | * Returns zero on success, negative values on failure. The caller is | |
616 | * responsible for calling the rcu_read_[un]lock() functions. | |
617 | * | |
618 | */ | |
13541b3a PM |
619 | static int netlbl_unlhsh_remove_addr6(struct net *net, |
620 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 621 | const struct in6_addr *addr, |
13541b3a PM |
622 | const struct in6_addr *mask, |
623 | struct netlbl_audit *audit_info) | |
8cc44579 | 624 | { |
61e10682 | 625 | struct netlbl_af6list *list_entry; |
8cc44579 | 626 | struct netlbl_unlhsh_addr6 *entry; |
61e10682 | 627 | struct audit_buffer *audit_buf; |
13541b3a | 628 | struct net_device *dev; |
61e10682 | 629 | char *secctx; |
13541b3a | 630 | u32 secctx_len; |
8cc44579 PM |
631 | |
632 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 633 | list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); |
8cc44579 | 634 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
635 | if (list_entry != NULL) |
636 | entry = netlbl_unlhsh_addr6_entry(list_entry); | |
637 | else | |
ec8f2375 | 638 | entry = NULL; |
8cc44579 | 639 | |
13541b3a PM |
640 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
641 | audit_info); | |
642 | if (audit_buf != NULL) { | |
643 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
644 | netlbl_af6list_audit_addr(audit_buf, 1, |
645 | (dev != NULL ? dev->name : NULL), | |
646 | addr, mask); | |
13541b3a PM |
647 | if (dev != NULL) |
648 | dev_put(dev); | |
ec8f2375 PM |
649 | if (entry != NULL && |
650 | security_secid_to_secctx(entry->secid, | |
651 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
652 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
653 | security_release_secctx(secctx, secctx_len); | |
654 | } | |
ec8f2375 | 655 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
656 | audit_log_end(audit_buf); |
657 | } | |
658 | ||
ec8f2375 PM |
659 | if (entry == NULL) |
660 | return -ENOENT; | |
661 | ||
662 | call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6); | |
663 | return 0; | |
8cc44579 PM |
664 | } |
665 | #endif /* IPv6 */ | |
666 | ||
667 | /** | |
668 | * netlbl_unlhsh_condremove_iface - Remove an interface entry | |
669 | * @iface: the interface entry | |
670 | * | |
671 | * Description: | |
672 | * Remove an interface entry from the unlabeled connection hash table if it is | |
673 | * empty. An interface entry is considered to be empty if there are no | |
674 | * address entries assigned to it. | |
675 | * | |
676 | */ | |
677 | static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) | |
678 | { | |
61e10682 PM |
679 | struct netlbl_af4list *iter4; |
680 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
681 | struct netlbl_af6list *iter6; | |
682 | #endif /* IPv6 */ | |
8cc44579 PM |
683 | |
684 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
685 | netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list) |
686 | goto unlhsh_condremove_failure; | |
687 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
688 | netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list) | |
689 | goto unlhsh_condremove_failure; | |
690 | #endif /* IPv6 */ | |
8cc44579 PM |
691 | iface->valid = 0; |
692 | if (iface->ifindex > 0) | |
693 | list_del_rcu(&iface->list); | |
694 | else | |
695 | rcu_assign_pointer(netlbl_unlhsh_def, NULL); | |
696 | spin_unlock(&netlbl_unlhsh_lock); | |
697 | ||
698 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
699 | return; | |
700 | ||
701 | unlhsh_condremove_failure: | |
702 | spin_unlock(&netlbl_unlhsh_lock); | |
703 | return; | |
704 | } | |
705 | ||
706 | /** | |
707 | * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table | |
708 | * @net: network namespace | |
709 | * @dev_name: interface name | |
710 | * @addr: IP address in network byte order | |
711 | * @mask: address mask in network byte order | |
712 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
13541b3a | 713 | * @audit_info: NetLabel audit information |
8cc44579 PM |
714 | * |
715 | * Description: | |
716 | * Removes and existing entry from the unlabeled connection hash table. | |
717 | * Returns zero on success, negative values on failure. | |
718 | * | |
719 | */ | |
6c2e8ac0 PM |
720 | int netlbl_unlhsh_remove(struct net *net, |
721 | const char *dev_name, | |
722 | const void *addr, | |
723 | const void *mask, | |
724 | u32 addr_len, | |
725 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
726 | { |
727 | int ret_val; | |
728 | struct net_device *dev; | |
729 | struct netlbl_unlhsh_iface *iface; | |
730 | ||
731 | if (addr_len != sizeof(struct in_addr) && | |
732 | addr_len != sizeof(struct in6_addr)) | |
733 | return -EINVAL; | |
734 | ||
735 | rcu_read_lock(); | |
736 | if (dev_name != NULL) { | |
122ec6ff | 737 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
738 | if (dev == NULL) { |
739 | ret_val = -ENODEV; | |
740 | goto unlhsh_remove_return; | |
741 | } | |
742 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
8cc44579 PM |
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): | |
13541b3a PM |
751 | ret_val = netlbl_unlhsh_remove_addr4(net, |
752 | iface, addr, mask, | |
753 | audit_info); | |
8cc44579 PM |
754 | break; |
755 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
756 | case sizeof(struct in6_addr): | |
13541b3a PM |
757 | ret_val = netlbl_unlhsh_remove_addr6(net, |
758 | iface, addr, mask, | |
759 | audit_info); | |
8cc44579 PM |
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 | ||
721499e8 | 798 | if (!net_eq(dev_net(dev), &init_net)) |
8cc44579 PM |
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 | } | |
32f50cde PM |
818 | |
819 | /** | |
820 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
821 | * @value: desired value | |
95d4e6be | 822 | * @audit_info: NetLabel audit information |
32f50cde PM |
823 | * |
824 | * Description: | |
825 | * Set the value of the unlabeled accept flag to @value. | |
826 | * | |
827 | */ | |
95d4e6be PM |
828 | static void netlbl_unlabel_acceptflg_set(u8 value, |
829 | struct netlbl_audit *audit_info) | |
32f50cde | 830 | { |
95d4e6be PM |
831 | struct audit_buffer *audit_buf; |
832 | u8 old_val; | |
833 | ||
4be2700f | 834 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 835 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
836 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
837 | audit_info); | |
de64688f PM |
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 | } | |
32f50cde PM |
843 | } |
844 | ||
8cc44579 PM |
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 | ||
96cb8e33 PM |
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 | { | |
fd385855 | 903 | u8 value; |
95d4e6be | 904 | struct netlbl_audit audit_info; |
96cb8e33 | 905 | |
fd385855 PM |
906 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
907 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 908 | if (value == 1 || value == 0) { |
95d4e6be PM |
909 | netlbl_netlink_auditinfo(skb, &audit_info); |
910 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 911 | return 0; |
96cb8e33 PM |
912 | } |
913 | } | |
914 | ||
32f50cde | 915 | return -EINVAL; |
96cb8e33 PM |
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 | { | |
fd385855 | 930 | int ret_val = -EINVAL; |
96cb8e33 | 931 | struct sk_buff *ans_skb; |
fd385855 | 932 | void *data; |
96cb8e33 | 933 | |
339bf98f | 934 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
935 | if (ans_skb == NULL) |
936 | goto list_failure; | |
17c157c8 TG |
937 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
938 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
939 | if (data == NULL) { |
940 | ret_val = -ENOMEM; | |
96cb8e33 | 941 | goto list_failure; |
fd385855 | 942 | } |
96cb8e33 | 943 | |
fd385855 PM |
944 | ret_val = nla_put_u8(ans_skb, |
945 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 946 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
947 | if (ret_val != 0) |
948 | goto list_failure; | |
949 | ||
fd385855 | 950 | genlmsg_end(ans_skb, data); |
fe785bee | 951 | return genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
952 | |
953 | list_failure: | |
b08d5840 | 954 | kfree_skb(ans_skb); |
96cb8e33 PM |
955 | return ret_val; |
956 | } | |
957 | ||
8cc44579 PM |
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; | |
13541b3a | 978 | struct netlbl_audit audit_info; |
8cc44579 PM |
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 | ||
13541b3a PM |
992 | netlbl_netlink_auditinfo(skb, &audit_info); |
993 | ||
8cc44579 PM |
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, | |
13541b3a PM |
1006 | dev_name, addr, mask, addr_len, secid, |
1007 | &audit_info); | |
8cc44579 PM |
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; | |
13541b3a | 1029 | struct netlbl_audit audit_info; |
8cc44579 PM |
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 | ||
13541b3a PM |
1042 | netlbl_netlink_auditinfo(skb, &audit_info); |
1043 | ||
8cc44579 PM |
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 | ||
13541b3a PM |
1054 | return netlbl_unlhsh_add(&init_net, |
1055 | NULL, addr, mask, addr_len, secid, | |
1056 | &audit_info); | |
8cc44579 PM |
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; | |
13541b3a | 1078 | struct netlbl_audit audit_info; |
8cc44579 PM |
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 | ||
13541b3a PM |
1089 | netlbl_netlink_auditinfo(skb, &audit_info); |
1090 | ||
8cc44579 PM |
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 | ||
13541b3a PM |
1096 | return netlbl_unlhsh_remove(&init_net, |
1097 | dev_name, addr, mask, addr_len, | |
1098 | &audit_info); | |
8cc44579 PM |
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; | |
13541b3a | 1119 | struct netlbl_audit audit_info; |
8cc44579 PM |
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 | ||
13541b3a PM |
1129 | netlbl_netlink_auditinfo(skb, &audit_info); |
1130 | ||
8cc44579 PM |
1131 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1132 | if (ret_val != 0) | |
1133 | return ret_val; | |
1134 | ||
13541b3a PM |
1135 | return netlbl_unlhsh_remove(&init_net, |
1136 | NULL, addr, mask, addr_len, | |
1137 | &audit_info); | |
8cc44579 PM |
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); | |
794eb6bf JJ |
1179 | if (!dev) { |
1180 | ret_val = -ENODEV; | |
1181 | goto list_cb_failure; | |
1182 | } | |
8cc44579 PM |
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 | ||
61e10682 | 1193 | addr_struct.s_addr = addr4->list.addr; |
8cc44579 PM |
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 | ||
61e10682 | 1201 | addr_struct.s_addr = addr4->list.mask; |
8cc44579 PM |
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), | |
61e10682 | 1214 | &addr6->list.addr); |
8cc44579 PM |
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), | |
61e10682 | 1221 | &addr6->list.mask); |
8cc44579 PM |
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; | |
56196701 | 1269 | struct list_head *iter_list; |
61e10682 PM |
1270 | struct netlbl_af4list *addr4; |
1271 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1272 | struct netlbl_af6list *addr6; | |
1273 | #endif | |
8cc44579 PM |
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) { | |
56196701 PM |
1283 | iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; |
1284 | list_for_each_entry_rcu(iface, iter_list, list) { | |
8cc44579 PM |
1285 | if (!iface->valid || |
1286 | iter_chain++ < skip_chain) | |
1287 | continue; | |
61e10682 PM |
1288 | netlbl_af4list_foreach_rcu(addr4, |
1289 | &iface->addr4_list) { | |
1290 | if (iter_addr4++ < skip_addr4) | |
8cc44579 PM |
1291 | continue; |
1292 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1293 | NLBL_UNLABEL_C_STATICLIST, |
1294 | iface, | |
1295 | netlbl_unlhsh_addr4_entry(addr4), | |
1296 | NULL, | |
1297 | &cb_arg) < 0) { | |
8cc44579 PM |
1298 | iter_addr4--; |
1299 | iter_chain--; | |
1300 | goto unlabel_staticlist_return; | |
1301 | } | |
1302 | } | |
61e10682 PM |
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) | |
8cc44579 PM |
1307 | continue; |
1308 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1309 | NLBL_UNLABEL_C_STATICLIST, |
1310 | iface, | |
1311 | NULL, | |
1312 | netlbl_unlhsh_addr6_entry(addr6), | |
1313 | &cb_arg) < 0) { | |
8cc44579 PM |
1314 | iter_addr6--; |
1315 | iter_chain--; | |
1316 | goto unlabel_staticlist_return; | |
1317 | } | |
1318 | } | |
61e10682 | 1319 | #endif /* IPv6 */ |
8cc44579 PM |
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]; | |
61e10682 PM |
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 | |
8cc44579 PM |
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 | ||
61e10682 PM |
1366 | netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
1367 | if (iter_addr4++ < skip_addr4) | |
8cc44579 PM |
1368 | continue; |
1369 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1370 | iface, |
1371 | netlbl_unlhsh_addr4_entry(addr4), | |
1372 | NULL, | |
1373 | &cb_arg) < 0) { | |
8cc44579 PM |
1374 | iter_addr4--; |
1375 | goto unlabel_staticlistdef_return; | |
1376 | } | |
1377 | } | |
61e10682 PM |
1378 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1379 | netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { | |
1380 | if (iter_addr6++ < skip_addr6) | |
8cc44579 PM |
1381 | continue; |
1382 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1383 | iface, |
1384 | NULL, | |
1385 | netlbl_unlhsh_addr6_entry(addr6), | |
1386 | &cb_arg) < 0) { | |
8cc44579 PM |
1387 | iter_addr6--; |
1388 | goto unlabel_staticlistdef_return; | |
1389 | } | |
1390 | } | |
61e10682 | 1391 | #endif /* IPv6 */ |
8cc44579 PM |
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 | } | |
96cb8e33 PM |
1399 | |
1400 | /* | |
1401 | * NetLabel Generic NETLINK Command Definitions | |
1402 | */ | |
1403 | ||
227c43c3 PE |
1404 | static struct genl_ops netlbl_unlabel_genl_ops[] = { |
1405 | { | |
8cc44579 PM |
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, | |
227c43c3 PE |
1411 | }, |
1412 | { | |
8cc44579 PM |
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, | |
227c43c3 PE |
1418 | }, |
1419 | { | |
8cc44579 PM |
1420 | .cmd = NLBL_UNLABEL_C_STATICLIST, |
1421 | .flags = 0, | |
1422 | .policy = netlbl_unlabel_genl_policy, | |
1423 | .doit = NULL, | |
1424 | .dumpit = netlbl_unlabel_staticlist, | |
227c43c3 PE |
1425 | }, |
1426 | { | |
8cc44579 PM |
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, | |
227c43c3 PE |
1432 | }, |
1433 | { | |
8cc44579 PM |
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, | |
227c43c3 PE |
1439 | }, |
1440 | { | |
8cc44579 PM |
1441 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
1442 | .flags = 0, | |
1443 | .policy = netlbl_unlabel_genl_policy, | |
1444 | .doit = NULL, | |
1445 | .dumpit = netlbl_unlabel_staticlistdef, | |
227c43c3 PE |
1446 | }, |
1447 | { | |
96cb8e33 | 1448 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
fd385855 PM |
1449 | .flags = GENL_ADMIN_PERM, |
1450 | .policy = netlbl_unlabel_genl_policy, | |
96cb8e33 PM |
1451 | .doit = netlbl_unlabel_accept, |
1452 | .dumpit = NULL, | |
227c43c3 PE |
1453 | }, |
1454 | { | |
96cb8e33 PM |
1455 | .cmd = NLBL_UNLABEL_C_LIST, |
1456 | .flags = 0, | |
fd385855 | 1457 | .policy = netlbl_unlabel_genl_policy, |
96cb8e33 PM |
1458 | .doit = netlbl_unlabel_list, |
1459 | .dumpit = NULL, | |
227c43c3 | 1460 | }, |
96cb8e33 PM |
1461 | }; |
1462 | ||
96cb8e33 PM |
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 | */ | |
05705e4e | 1475 | int __init netlbl_unlabel_genl_init(void) |
96cb8e33 | 1476 | { |
7ae740df MM |
1477 | return genl_register_family_with_ops(&netlbl_unlabel_gnl_family, |
1478 | netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops)); | |
96cb8e33 PM |
1479 | } |
1480 | ||
1481 | /* | |
1482 | * NetLabel KAPI Hooks | |
1483 | */ | |
1484 | ||
8cc44579 PM |
1485 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1486 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1487 | }; | |
1488 | ||
1489 | /** | |
1490 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1491 | * @size: the number of bits to use for the hash buckets | |
1492 | * | |
1493 | * Description: | |
1494 | * Initializes the unlabeled connection hash table and registers a network | |
1495 | * device notification handler. This function should only be called by the | |
1496 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1497 | * non-zero values on error. | |
1498 | * | |
1499 | */ | |
05705e4e | 1500 | int __init netlbl_unlabel_init(u32 size) |
8cc44579 PM |
1501 | { |
1502 | u32 iter; | |
1503 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1504 | ||
1505 | if (size == 0) | |
1506 | return -EINVAL; | |
1507 | ||
1508 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1509 | if (hsh_tbl == NULL) | |
1510 | return -ENOMEM; | |
1511 | hsh_tbl->size = 1 << size; | |
1512 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1513 | sizeof(struct list_head), | |
1514 | GFP_KERNEL); | |
1515 | if (hsh_tbl->tbl == NULL) { | |
1516 | kfree(hsh_tbl); | |
1517 | return -ENOMEM; | |
1518 | } | |
1519 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1520 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1521 | ||
1522 | rcu_read_lock(); | |
1523 | spin_lock(&netlbl_unlhsh_lock); | |
1524 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); | |
1525 | spin_unlock(&netlbl_unlhsh_lock); | |
1526 | rcu_read_unlock(); | |
1527 | ||
1528 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
96cb8e33 PM |
1533 | /** |
1534 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1535 | * @skb: the packet |
1536 | * @family: protocol family | |
96cb8e33 PM |
1537 | * @secattr: the security attributes |
1538 | * | |
1539 | * Description: | |
1540 | * Determine the security attributes, if any, for an unlabled packet and return | |
1541 | * them in @secattr. Returns zero on success and negative values on failure. | |
1542 | * | |
1543 | */ | |
8cc44579 PM |
1544 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1545 | u16 family, | |
1546 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1547 | { |
8cc44579 PM |
1548 | struct netlbl_unlhsh_iface *iface; |
1549 | ||
1550 | rcu_read_lock(); | |
8964be4a | 1551 | iface = netlbl_unlhsh_search_iface_def(skb->skb_iif); |
8cc44579 PM |
1552 | if (iface == NULL) |
1553 | goto unlabel_getattr_nolabel; | |
1554 | switch (family) { | |
56628b1d PE |
1555 | case PF_INET: { |
1556 | struct iphdr *hdr4; | |
61e10682 | 1557 | struct netlbl_af4list *addr4; |
56628b1d | 1558 | |
8cc44579 | 1559 | hdr4 = ip_hdr(skb); |
61e10682 PM |
1560 | addr4 = netlbl_af4list_search(hdr4->saddr, |
1561 | &iface->addr4_list); | |
8cc44579 PM |
1562 | if (addr4 == NULL) |
1563 | goto unlabel_getattr_nolabel; | |
61e10682 | 1564 | secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
8cc44579 | 1565 | break; |
56628b1d | 1566 | } |
8cc44579 | 1567 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
56628b1d PE |
1568 | case PF_INET6: { |
1569 | struct ipv6hdr *hdr6; | |
61e10682 | 1570 | struct netlbl_af6list *addr6; |
56628b1d | 1571 | |
8cc44579 | 1572 | hdr6 = ipv6_hdr(skb); |
61e10682 PM |
1573 | addr6 = netlbl_af6list_search(&hdr6->saddr, |
1574 | &iface->addr6_list); | |
8cc44579 PM |
1575 | if (addr6 == NULL) |
1576 | goto unlabel_getattr_nolabel; | |
61e10682 | 1577 | secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; |
8cc44579 | 1578 | break; |
56628b1d | 1579 | } |
8cc44579 PM |
1580 | #endif /* IPv6 */ |
1581 | default: | |
1582 | goto unlabel_getattr_nolabel; | |
1583 | } | |
1584 | rcu_read_unlock(); | |
1585 | ||
1586 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1587 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1588 | return 0; | |
1589 | ||
1590 | unlabel_getattr_nolabel: | |
1591 | rcu_read_unlock(); | |
c783f1ce PM |
1592 | if (netlabel_unlabel_acceptflg == 0) |
1593 | return -ENOMSG; | |
16efd454 | 1594 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1595 | return 0; |
96cb8e33 PM |
1596 | } |
1597 | ||
1598 | /** | |
1599 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1600 | * | |
1601 | * Description: | |
1602 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1603 | * and to send unlabeled network traffic by default. | |
1604 | * | |
1605 | */ | |
05705e4e | 1606 | int __init netlbl_unlabel_defconf(void) |
96cb8e33 PM |
1607 | { |
1608 | int ret_val; | |
1609 | struct netlbl_dom_map *entry; | |
95d4e6be | 1610 | struct netlbl_audit audit_info; |
32f50cde | 1611 | |
95d4e6be PM |
1612 | /* Only the kernel is allowed to call this function and the only time |
1613 | * it is called is at bootup before the audit subsystem is reporting | |
1614 | * messages so don't worry to much about these values. */ | |
1615 | security_task_getsecid(current, &audit_info.secid); | |
1616 | audit_info.loginuid = 0; | |
2532386f | 1617 | audit_info.sessionid = 0; |
96cb8e33 PM |
1618 | |
1619 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1620 | if (entry == NULL) | |
1621 | return -ENOMEM; | |
1622 | entry->type = NETLBL_NLTYPE_UNLABELED; | |
95d4e6be | 1623 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1624 | if (ret_val != 0) |
1625 | return ret_val; | |
1626 | ||
95d4e6be | 1627 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1628 | |
1629 | return 0; | |
1630 | } |