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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> | |
96cb8e33 PM |
46 | #include <net/sock.h> |
47 | #include <net/netlink.h> | |
48 | #include <net/genetlink.h> | |
8cc44579 PM |
49 | #include <net/ip.h> |
50 | #include <net/ipv6.h> | |
51 | #include <net/net_namespace.h> | |
96cb8e33 PM |
52 | #include <net/netlabel.h> |
53 | #include <asm/bug.h> | |
8cc44579 | 54 | #include <asm/atomic.h> |
96cb8e33 PM |
55 | |
56 | #include "netlabel_user.h" | |
61e10682 | 57 | #include "netlabel_addrlist.h" |
96cb8e33 PM |
58 | #include "netlabel_domainhash.h" |
59 | #include "netlabel_unlabeled.h" | |
8cc44579 PM |
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 | }; | |
61e10682 PM |
80 | #define netlbl_unlhsh_addr4_entry(iter) \ |
81 | container_of(iter, struct netlbl_unlhsh_addr4, list) | |
8cc44579 | 82 | struct netlbl_unlhsh_addr4 { |
8cc44579 PM |
83 | u32 secid; |
84 | ||
61e10682 | 85 | struct netlbl_af4list list; |
8cc44579 PM |
86 | struct rcu_head rcu; |
87 | }; | |
61e10682 PM |
88 | #define netlbl_unlhsh_addr6_entry(iter) \ |
89 | container_of(iter, struct netlbl_unlhsh_addr6, list) | |
8cc44579 | 90 | struct netlbl_unlhsh_addr6 { |
8cc44579 PM |
91 | u32 secid; |
92 | ||
61e10682 | 93 | struct netlbl_af6list list; |
8cc44579 PM |
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; | |
96cb8e33 PM |
119 | |
120 | /* Accept unlabeled packets flag */ | |
cd28786d | 121 | static u8 netlabel_unlabel_acceptflg = 0; |
96cb8e33 | 122 | |
8cc44579 | 123 | /* NetLabel Generic NETLINK unlabeled family */ |
96cb8e33 PM |
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, | |
fd385855 | 129 | .maxattr = NLBL_UNLABEL_A_MAX, |
96cb8e33 PM |
130 | }; |
131 | ||
fd385855 | 132 | /* NetLabel Netlink attribute policy */ |
ef7c79ed | 133 | static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
fd385855 | 134 | [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
8cc44579 PM |
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 } | |
fd385855 | 146 | }; |
96cb8e33 | 147 | |
32f50cde | 148 | /* |
8cc44579 PM |
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; | |
61e10682 PM |
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 */ | |
8cc44579 PM |
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 | ||
61e10682 PM |
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 */ | |
8cc44579 PM |
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 | ||
8cc44579 PM |
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; | |
56196701 | 262 | struct list_head *bkt_list; |
8cc44579 PM |
263 | struct netlbl_unlhsh_iface *iter; |
264 | ||
265 | bkt = netlbl_unlhsh_hash(ifindex); | |
56196701 PM |
266 | bkt_list = &rcu_dereference(netlbl_unlhsh)->tbl[bkt]; |
267 | list_for_each_entry_rcu(iter, bkt_list, list) | |
8cc44579 PM |
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 | * | |
32f50cde | 314 | */ |
8cc44579 PM |
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 | { | |
61e10682 | 320 | int ret_val; |
8cc44579 | 321 | struct netlbl_unlhsh_addr4 *entry; |
8cc44579 PM |
322 | |
323 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
324 | if (entry == NULL) | |
325 | return -ENOMEM; | |
326 | ||
61e10682 PM |
327 | entry->list.addr = addr->s_addr & mask->s_addr; |
328 | entry->list.mask = mask->s_addr; | |
329 | entry->list.valid = 1; | |
61e10682 | 330 | entry->secid = secid; |
8cc44579 PM |
331 | |
332 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 333 | ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); |
8cc44579 | 334 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
335 | |
336 | if (ret_val != 0) | |
337 | kfree(entry); | |
338 | return ret_val; | |
8cc44579 PM |
339 | } |
340 | ||
341 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
342 | /** | |
343 | * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table | |
344 | * @iface: the associated interface entry | |
345 | * @addr: IPv6 address in network byte order | |
346 | * @mask: IPv6 address mask in network byte order | |
347 | * @secid: LSM secid value for entry | |
348 | * | |
349 | * Description: | |
350 | * Add a new address entry into the unlabeled connection hash table using the | |
351 | * interface entry specified by @iface. On success zero is returned, otherwise | |
352 | * a negative value is returned. The caller is responsible for calling the | |
353 | * rcu_read_[un]lock() functions. | |
354 | * | |
355 | */ | |
356 | static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, | |
357 | const struct in6_addr *addr, | |
358 | const struct in6_addr *mask, | |
359 | u32 secid) | |
360 | { | |
61e10682 | 361 | int ret_val; |
8cc44579 | 362 | struct netlbl_unlhsh_addr6 *entry; |
8cc44579 PM |
363 | |
364 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
365 | if (entry == NULL) | |
366 | return -ENOMEM; | |
367 | ||
61e10682 PM |
368 | ipv6_addr_copy(&entry->list.addr, addr); |
369 | entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; | |
370 | entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; | |
371 | entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; | |
372 | entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; | |
373 | ipv6_addr_copy(&entry->list.mask, mask); | |
374 | entry->list.valid = 1; | |
61e10682 | 375 | entry->secid = secid; |
8cc44579 PM |
376 | |
377 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 378 | ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); |
8cc44579 | 379 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
380 | |
381 | if (ret_val != 0) | |
382 | kfree(entry); | |
8cc44579 PM |
383 | return 0; |
384 | } | |
385 | #endif /* IPv6 */ | |
386 | ||
387 | /** | |
388 | * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table | |
389 | * @ifindex: network interface | |
390 | * | |
391 | * Description: | |
392 | * Add a new, empty, interface entry into the unlabeled connection hash table. | |
393 | * On success a pointer to the new interface entry is returned, on failure NULL | |
394 | * is returned. The caller is responsible for calling the rcu_read_[un]lock() | |
395 | * functions. | |
396 | * | |
397 | */ | |
398 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) | |
399 | { | |
400 | u32 bkt; | |
401 | struct netlbl_unlhsh_iface *iface; | |
402 | ||
403 | iface = kzalloc(sizeof(*iface), GFP_ATOMIC); | |
404 | if (iface == NULL) | |
405 | return NULL; | |
406 | ||
407 | iface->ifindex = ifindex; | |
408 | INIT_LIST_HEAD(&iface->addr4_list); | |
409 | INIT_LIST_HEAD(&iface->addr6_list); | |
410 | iface->valid = 1; | |
8cc44579 PM |
411 | |
412 | spin_lock(&netlbl_unlhsh_lock); | |
413 | if (ifindex > 0) { | |
414 | bkt = netlbl_unlhsh_hash(ifindex); | |
415 | if (netlbl_unlhsh_search_iface(ifindex) != NULL) | |
416 | goto add_iface_failure; | |
417 | list_add_tail_rcu(&iface->list, | |
418 | &rcu_dereference(netlbl_unlhsh)->tbl[bkt]); | |
419 | } else { | |
420 | INIT_LIST_HEAD(&iface->list); | |
421 | if (rcu_dereference(netlbl_unlhsh_def) != NULL) | |
422 | goto add_iface_failure; | |
423 | rcu_assign_pointer(netlbl_unlhsh_def, iface); | |
424 | } | |
425 | spin_unlock(&netlbl_unlhsh_lock); | |
426 | ||
427 | return iface; | |
428 | ||
429 | add_iface_failure: | |
430 | spin_unlock(&netlbl_unlhsh_lock); | |
431 | kfree(iface); | |
432 | return NULL; | |
433 | } | |
434 | ||
435 | /** | |
436 | * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table | |
437 | * @net: network namespace | |
438 | * @dev_name: interface name | |
439 | * @addr: IP address in network byte order | |
440 | * @mask: address mask in network byte order | |
441 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
442 | * @secid: LSM secid value for the entry | |
13541b3a | 443 | * @audit_info: NetLabel audit information |
8cc44579 PM |
444 | * |
445 | * Description: | |
446 | * Adds a new entry to the unlabeled connection hash table. Returns zero on | |
447 | * success, negative values on failure. | |
448 | * | |
449 | */ | |
6c2e8ac0 PM |
450 | int netlbl_unlhsh_add(struct net *net, |
451 | const char *dev_name, | |
452 | const void *addr, | |
453 | const void *mask, | |
454 | u32 addr_len, | |
455 | u32 secid, | |
456 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
457 | { |
458 | int ret_val; | |
459 | int ifindex; | |
460 | struct net_device *dev; | |
461 | struct netlbl_unlhsh_iface *iface; | |
13541b3a PM |
462 | struct audit_buffer *audit_buf = NULL; |
463 | char *secctx = NULL; | |
464 | u32 secctx_len; | |
8cc44579 PM |
465 | |
466 | if (addr_len != sizeof(struct in_addr) && | |
467 | addr_len != sizeof(struct in6_addr)) | |
468 | return -EINVAL; | |
469 | ||
470 | rcu_read_lock(); | |
471 | if (dev_name != NULL) { | |
122ec6ff | 472 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
473 | if (dev == NULL) { |
474 | ret_val = -ENODEV; | |
475 | goto unlhsh_add_return; | |
476 | } | |
477 | ifindex = dev->ifindex; | |
8cc44579 PM |
478 | iface = netlbl_unlhsh_search_iface(ifindex); |
479 | } else { | |
480 | ifindex = 0; | |
481 | iface = rcu_dereference(netlbl_unlhsh_def); | |
482 | } | |
483 | if (iface == NULL) { | |
484 | iface = netlbl_unlhsh_add_iface(ifindex); | |
485 | if (iface == NULL) { | |
486 | ret_val = -ENOMEM; | |
487 | goto unlhsh_add_return; | |
488 | } | |
489 | } | |
13541b3a PM |
490 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, |
491 | audit_info); | |
8cc44579 | 492 | switch (addr_len) { |
56628b1d PE |
493 | case sizeof(struct in_addr): { |
494 | struct in_addr *addr4, *mask4; | |
495 | ||
13541b3a PM |
496 | addr4 = (struct in_addr *)addr; |
497 | mask4 = (struct in_addr *)mask; | |
498 | ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); | |
499 | if (audit_buf != NULL) | |
63c41688 PM |
500 | netlbl_af4list_audit_addr(audit_buf, 1, |
501 | dev_name, | |
502 | addr4->s_addr, | |
503 | mask4->s_addr); | |
8cc44579 | 504 | break; |
56628b1d | 505 | } |
8cc44579 | 506 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
56628b1d PE |
507 | case sizeof(struct in6_addr): { |
508 | struct in6_addr *addr6, *mask6; | |
509 | ||
13541b3a PM |
510 | addr6 = (struct in6_addr *)addr; |
511 | mask6 = (struct in6_addr *)mask; | |
512 | ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); | |
513 | if (audit_buf != NULL) | |
63c41688 PM |
514 | netlbl_af6list_audit_addr(audit_buf, 1, |
515 | dev_name, | |
516 | addr6, mask6); | |
8cc44579 | 517 | break; |
56628b1d | 518 | } |
8cc44579 PM |
519 | #endif /* IPv6 */ |
520 | default: | |
521 | ret_val = -EINVAL; | |
522 | } | |
523 | if (ret_val == 0) | |
524 | atomic_inc(&netlabel_mgmt_protocount); | |
525 | ||
526 | unlhsh_add_return: | |
527 | rcu_read_unlock(); | |
13541b3a PM |
528 | if (audit_buf != NULL) { |
529 | if (security_secid_to_secctx(secid, | |
530 | &secctx, | |
531 | &secctx_len) == 0) { | |
532 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
533 | security_release_secctx(secctx, secctx_len); | |
534 | } | |
535 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
536 | audit_log_end(audit_buf); | |
537 | } | |
8cc44579 PM |
538 | return ret_val; |
539 | } | |
540 | ||
541 | /** | |
542 | * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry | |
13541b3a | 543 | * @net: network namespace |
8cc44579 PM |
544 | * @iface: interface entry |
545 | * @addr: IP address | |
546 | * @mask: IP address mask | |
13541b3a | 547 | * @audit_info: NetLabel audit information |
8cc44579 PM |
548 | * |
549 | * Description: | |
550 | * Remove an IP address entry from the unlabeled connection hash table. | |
551 | * Returns zero on success, negative values on failure. The caller is | |
552 | * responsible for calling the rcu_read_[un]lock() functions. | |
553 | * | |
554 | */ | |
13541b3a PM |
555 | static int netlbl_unlhsh_remove_addr4(struct net *net, |
556 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 557 | const struct in_addr *addr, |
13541b3a PM |
558 | const struct in_addr *mask, |
559 | struct netlbl_audit *audit_info) | |
8cc44579 | 560 | { |
61e10682 | 561 | struct netlbl_af4list *list_entry; |
8cc44579 | 562 | struct netlbl_unlhsh_addr4 *entry; |
61e10682 | 563 | struct audit_buffer *audit_buf; |
13541b3a | 564 | struct net_device *dev; |
61e10682 | 565 | char *secctx; |
13541b3a | 566 | u32 secctx_len; |
8cc44579 PM |
567 | |
568 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
569 | list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, |
570 | &iface->addr4_list); | |
8cc44579 | 571 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
572 | if (list_entry != NULL) |
573 | entry = netlbl_unlhsh_addr4_entry(list_entry); | |
574 | else | |
ec8f2375 | 575 | entry = NULL; |
8cc44579 | 576 | |
13541b3a PM |
577 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
578 | audit_info); | |
579 | if (audit_buf != NULL) { | |
580 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
581 | netlbl_af4list_audit_addr(audit_buf, 1, |
582 | (dev != NULL ? dev->name : NULL), | |
583 | addr->s_addr, mask->s_addr); | |
13541b3a PM |
584 | if (dev != NULL) |
585 | dev_put(dev); | |
ec8f2375 PM |
586 | if (entry != NULL && |
587 | security_secid_to_secctx(entry->secid, | |
588 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
589 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
590 | security_release_secctx(secctx, secctx_len); | |
591 | } | |
ec8f2375 | 592 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
593 | audit_log_end(audit_buf); |
594 | } | |
595 | ||
ec8f2375 PM |
596 | if (entry == NULL) |
597 | return -ENOENT; | |
598 | ||
599 | call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4); | |
600 | return 0; | |
8cc44579 PM |
601 | } |
602 | ||
603 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
604 | /** | |
605 | * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry | |
13541b3a | 606 | * @net: network namespace |
8cc44579 PM |
607 | * @iface: interface entry |
608 | * @addr: IP address | |
609 | * @mask: IP address mask | |
13541b3a | 610 | * @audit_info: NetLabel audit information |
8cc44579 PM |
611 | * |
612 | * Description: | |
613 | * Remove an IP address entry from the unlabeled connection hash table. | |
614 | * Returns zero on success, negative values on failure. The caller is | |
615 | * responsible for calling the rcu_read_[un]lock() functions. | |
616 | * | |
617 | */ | |
13541b3a PM |
618 | static int netlbl_unlhsh_remove_addr6(struct net *net, |
619 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 620 | const struct in6_addr *addr, |
13541b3a PM |
621 | const struct in6_addr *mask, |
622 | struct netlbl_audit *audit_info) | |
8cc44579 | 623 | { |
61e10682 | 624 | struct netlbl_af6list *list_entry; |
8cc44579 | 625 | struct netlbl_unlhsh_addr6 *entry; |
61e10682 | 626 | struct audit_buffer *audit_buf; |
13541b3a | 627 | struct net_device *dev; |
61e10682 | 628 | char *secctx; |
13541b3a | 629 | u32 secctx_len; |
8cc44579 PM |
630 | |
631 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 632 | list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); |
8cc44579 | 633 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
634 | if (list_entry != NULL) |
635 | entry = netlbl_unlhsh_addr6_entry(list_entry); | |
636 | else | |
ec8f2375 | 637 | entry = NULL; |
8cc44579 | 638 | |
13541b3a PM |
639 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
640 | audit_info); | |
641 | if (audit_buf != NULL) { | |
642 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
643 | netlbl_af6list_audit_addr(audit_buf, 1, |
644 | (dev != NULL ? dev->name : NULL), | |
645 | addr, mask); | |
13541b3a PM |
646 | if (dev != NULL) |
647 | dev_put(dev); | |
ec8f2375 PM |
648 | if (entry != NULL && |
649 | security_secid_to_secctx(entry->secid, | |
650 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
651 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
652 | security_release_secctx(secctx, secctx_len); | |
653 | } | |
ec8f2375 | 654 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
655 | audit_log_end(audit_buf); |
656 | } | |
657 | ||
ec8f2375 PM |
658 | if (entry == NULL) |
659 | return -ENOENT; | |
660 | ||
661 | call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6); | |
662 | return 0; | |
8cc44579 PM |
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 | { | |
61e10682 PM |
678 | struct netlbl_af4list *iter4; |
679 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
680 | struct netlbl_af6list *iter6; | |
681 | #endif /* IPv6 */ | |
8cc44579 PM |
682 | |
683 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
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 */ | |
8cc44579 PM |
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) | |
13541b3a | 712 | * @audit_info: NetLabel audit information |
8cc44579 PM |
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 | */ | |
6c2e8ac0 PM |
719 | 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) | |
8cc44579 PM |
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) { | |
122ec6ff | 736 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
737 | if (dev == NULL) { |
738 | ret_val = -ENODEV; | |
739 | goto unlhsh_remove_return; | |
740 | } | |
741 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
8cc44579 PM |
742 | } else |
743 | iface = rcu_dereference(netlbl_unlhsh_def); | |
744 | if (iface == NULL) { | |
745 | ret_val = -ENOENT; | |
746 | goto unlhsh_remove_return; | |
747 | } | |
748 | switch (addr_len) { | |
749 | case sizeof(struct in_addr): | |
13541b3a PM |
750 | ret_val = netlbl_unlhsh_remove_addr4(net, |
751 | iface, addr, mask, | |
752 | audit_info); | |
8cc44579 PM |
753 | break; |
754 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
755 | case sizeof(struct in6_addr): | |
13541b3a PM |
756 | ret_val = netlbl_unlhsh_remove_addr6(net, |
757 | iface, addr, mask, | |
758 | audit_info); | |
8cc44579 PM |
759 | break; |
760 | #endif /* IPv6 */ | |
761 | default: | |
762 | ret_val = -EINVAL; | |
763 | } | |
764 | if (ret_val == 0) { | |
765 | netlbl_unlhsh_condremove_iface(iface); | |
766 | atomic_dec(&netlabel_mgmt_protocount); | |
767 | } | |
768 | ||
769 | unlhsh_remove_return: | |
770 | rcu_read_unlock(); | |
771 | return ret_val; | |
772 | } | |
773 | ||
774 | /* | |
775 | * General Helper Functions | |
776 | */ | |
777 | ||
778 | /** | |
779 | * netlbl_unlhsh_netdev_handler - Network device notification handler | |
780 | * @this: notifier block | |
781 | * @event: the event | |
782 | * @ptr: the network device (cast to void) | |
783 | * | |
784 | * Description: | |
785 | * Handle network device events, although at present all we care about is a | |
786 | * network device going away. In the case of a device going away we clear any | |
787 | * related entries from the unlabeled connection hash table. | |
788 | * | |
789 | */ | |
790 | static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, | |
791 | unsigned long event, | |
792 | void *ptr) | |
793 | { | |
794 | struct net_device *dev = ptr; | |
795 | struct netlbl_unlhsh_iface *iface = NULL; | |
796 | ||
721499e8 | 797 | if (!net_eq(dev_net(dev), &init_net)) |
8cc44579 PM |
798 | return NOTIFY_DONE; |
799 | ||
800 | /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ | |
801 | if (event == NETDEV_DOWN) { | |
802 | spin_lock(&netlbl_unlhsh_lock); | |
803 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
804 | if (iface != NULL && iface->valid) { | |
805 | iface->valid = 0; | |
806 | list_del_rcu(&iface->list); | |
807 | } else | |
808 | iface = NULL; | |
809 | spin_unlock(&netlbl_unlhsh_lock); | |
810 | } | |
811 | ||
812 | if (iface != NULL) | |
813 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
814 | ||
815 | return NOTIFY_DONE; | |
816 | } | |
32f50cde PM |
817 | |
818 | /** | |
819 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
820 | * @value: desired value | |
95d4e6be | 821 | * @audit_info: NetLabel audit information |
32f50cde PM |
822 | * |
823 | * Description: | |
824 | * Set the value of the unlabeled accept flag to @value. | |
825 | * | |
826 | */ | |
95d4e6be PM |
827 | static void netlbl_unlabel_acceptflg_set(u8 value, |
828 | struct netlbl_audit *audit_info) | |
32f50cde | 829 | { |
95d4e6be PM |
830 | struct audit_buffer *audit_buf; |
831 | u8 old_val; | |
832 | ||
4be2700f | 833 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 834 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
835 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
836 | audit_info); | |
de64688f PM |
837 | if (audit_buf != NULL) { |
838 | audit_log_format(audit_buf, | |
839 | " unlbl_accept=%u old=%u", value, old_val); | |
840 | audit_log_end(audit_buf); | |
841 | } | |
32f50cde PM |
842 | } |
843 | ||
8cc44579 PM |
844 | /** |
845 | * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information | |
846 | * @info: the Generic NETLINK info block | |
847 | * @addr: the IP address | |
848 | * @mask: the IP address mask | |
849 | * @len: the address length | |
850 | * | |
851 | * Description: | |
852 | * Examine the Generic NETLINK message and extract the IP address information. | |
853 | * Returns zero on success, negative values on failure. | |
854 | * | |
855 | */ | |
856 | static int netlbl_unlabel_addrinfo_get(struct genl_info *info, | |
857 | void **addr, | |
858 | void **mask, | |
859 | u32 *len) | |
860 | { | |
861 | u32 addr_len; | |
862 | ||
863 | if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) { | |
864 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
865 | if (addr_len != sizeof(struct in_addr) && | |
866 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) | |
867 | return -EINVAL; | |
868 | *len = addr_len; | |
869 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
870 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); | |
871 | return 0; | |
872 | } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { | |
873 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
874 | if (addr_len != sizeof(struct in6_addr) && | |
875 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) | |
876 | return -EINVAL; | |
877 | *len = addr_len; | |
878 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
879 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); | |
880 | return 0; | |
881 | } | |
882 | ||
883 | return -EINVAL; | |
884 | } | |
885 | ||
96cb8e33 PM |
886 | /* |
887 | * NetLabel Command Handlers | |
888 | */ | |
889 | ||
890 | /** | |
891 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
892 | * @skb: the NETLINK buffer | |
893 | * @info: the Generic NETLINK info block | |
894 | * | |
895 | * Description: | |
896 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
897 | * Returns zero on success, negative values on failure. | |
898 | * | |
899 | */ | |
900 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
901 | { | |
fd385855 | 902 | u8 value; |
95d4e6be | 903 | struct netlbl_audit audit_info; |
96cb8e33 | 904 | |
fd385855 PM |
905 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
906 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 907 | if (value == 1 || value == 0) { |
95d4e6be PM |
908 | netlbl_netlink_auditinfo(skb, &audit_info); |
909 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 910 | return 0; |
96cb8e33 PM |
911 | } |
912 | } | |
913 | ||
32f50cde | 914 | return -EINVAL; |
96cb8e33 PM |
915 | } |
916 | ||
917 | /** | |
918 | * netlbl_unlabel_list - Handle a LIST message | |
919 | * @skb: the NETLINK buffer | |
920 | * @info: the Generic NETLINK info block | |
921 | * | |
922 | * Description: | |
923 | * Process a user generated LIST message and respond with the current status. | |
924 | * Returns zero on success, negative values on failure. | |
925 | * | |
926 | */ | |
927 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
928 | { | |
fd385855 | 929 | int ret_val = -EINVAL; |
96cb8e33 | 930 | struct sk_buff *ans_skb; |
fd385855 | 931 | void *data; |
96cb8e33 | 932 | |
339bf98f | 933 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
934 | if (ans_skb == NULL) |
935 | goto list_failure; | |
17c157c8 TG |
936 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
937 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
938 | if (data == NULL) { |
939 | ret_val = -ENOMEM; | |
96cb8e33 | 940 | goto list_failure; |
fd385855 | 941 | } |
96cb8e33 | 942 | |
fd385855 PM |
943 | ret_val = nla_put_u8(ans_skb, |
944 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 945 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
946 | if (ret_val != 0) |
947 | goto list_failure; | |
948 | ||
fd385855 | 949 | genlmsg_end(ans_skb, data); |
fe785bee | 950 | return genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
951 | |
952 | list_failure: | |
b08d5840 | 953 | kfree_skb(ans_skb); |
96cb8e33 PM |
954 | return ret_val; |
955 | } | |
956 | ||
8cc44579 PM |
957 | /** |
958 | * netlbl_unlabel_staticadd - Handle a STATICADD message | |
959 | * @skb: the NETLINK buffer | |
960 | * @info: the Generic NETLINK info block | |
961 | * | |
962 | * Description: | |
963 | * Process a user generated STATICADD message and add a new unlabeled | |
964 | * connection entry to the hash table. Returns zero on success, negative | |
965 | * values on failure. | |
966 | * | |
967 | */ | |
968 | static int netlbl_unlabel_staticadd(struct sk_buff *skb, | |
969 | struct genl_info *info) | |
970 | { | |
971 | int ret_val; | |
972 | char *dev_name; | |
973 | void *addr; | |
974 | void *mask; | |
975 | u32 addr_len; | |
976 | u32 secid; | |
13541b3a | 977 | struct netlbl_audit audit_info; |
8cc44579 PM |
978 | |
979 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
980 | * single entry. However, allow users to create two entries, one each | |
981 | * for IPv4 and IPv4, with the same LSM security context which should | |
982 | * achieve the same result. */ | |
983 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
984 | !info->attrs[NLBL_UNLABEL_A_IFACE] || | |
985 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
986 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
987 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
988 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
989 | return -EINVAL; | |
990 | ||
13541b3a PM |
991 | netlbl_netlink_auditinfo(skb, &audit_info); |
992 | ||
8cc44579 PM |
993 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
994 | if (ret_val != 0) | |
995 | return ret_val; | |
996 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
997 | ret_val = security_secctx_to_secid( | |
998 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
999 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1000 | &secid); | |
1001 | if (ret_val != 0) | |
1002 | return ret_val; | |
1003 | ||
1004 | return netlbl_unlhsh_add(&init_net, | |
13541b3a PM |
1005 | dev_name, addr, mask, addr_len, secid, |
1006 | &audit_info); | |
8cc44579 PM |
1007 | } |
1008 | ||
1009 | /** | |
1010 | * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message | |
1011 | * @skb: the NETLINK buffer | |
1012 | * @info: the Generic NETLINK info block | |
1013 | * | |
1014 | * Description: | |
1015 | * Process a user generated STATICADDDEF message and add a new default | |
1016 | * unlabeled connection entry. Returns zero on success, negative values on | |
1017 | * failure. | |
1018 | * | |
1019 | */ | |
1020 | static int netlbl_unlabel_staticadddef(struct sk_buff *skb, | |
1021 | struct genl_info *info) | |
1022 | { | |
1023 | int ret_val; | |
1024 | void *addr; | |
1025 | void *mask; | |
1026 | u32 addr_len; | |
1027 | u32 secid; | |
13541b3a | 1028 | struct netlbl_audit audit_info; |
8cc44579 PM |
1029 | |
1030 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
1031 | * single entry. However, allow users to create two entries, one each | |
1032 | * for IPv4 and IPv6, with the same LSM security context which should | |
1033 | * achieve the same result. */ | |
1034 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
1035 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1036 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1037 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1038 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1039 | return -EINVAL; | |
1040 | ||
13541b3a PM |
1041 | netlbl_netlink_auditinfo(skb, &audit_info); |
1042 | ||
8cc44579 PM |
1043 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1044 | if (ret_val != 0) | |
1045 | return ret_val; | |
1046 | ret_val = security_secctx_to_secid( | |
1047 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1048 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1049 | &secid); | |
1050 | if (ret_val != 0) | |
1051 | return ret_val; | |
1052 | ||
13541b3a PM |
1053 | return netlbl_unlhsh_add(&init_net, |
1054 | NULL, addr, mask, addr_len, secid, | |
1055 | &audit_info); | |
8cc44579 PM |
1056 | } |
1057 | ||
1058 | /** | |
1059 | * netlbl_unlabel_staticremove - Handle a STATICREMOVE message | |
1060 | * @skb: the NETLINK buffer | |
1061 | * @info: the Generic NETLINK info block | |
1062 | * | |
1063 | * Description: | |
1064 | * Process a user generated STATICREMOVE message and remove the specified | |
1065 | * unlabeled connection entry. Returns zero on success, negative values on | |
1066 | * failure. | |
1067 | * | |
1068 | */ | |
1069 | static int netlbl_unlabel_staticremove(struct sk_buff *skb, | |
1070 | struct genl_info *info) | |
1071 | { | |
1072 | int ret_val; | |
1073 | char *dev_name; | |
1074 | void *addr; | |
1075 | void *mask; | |
1076 | u32 addr_len; | |
13541b3a | 1077 | struct netlbl_audit audit_info; |
8cc44579 PM |
1078 | |
1079 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1080 | * IPv4 and IPv6 in the same entry. */ | |
1081 | if (!info->attrs[NLBL_UNLABEL_A_IFACE] || | |
1082 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1083 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1084 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1085 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1086 | return -EINVAL; | |
1087 | ||
13541b3a PM |
1088 | netlbl_netlink_auditinfo(skb, &audit_info); |
1089 | ||
8cc44579 PM |
1090 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1091 | if (ret_val != 0) | |
1092 | return ret_val; | |
1093 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1094 | ||
13541b3a PM |
1095 | return netlbl_unlhsh_remove(&init_net, |
1096 | dev_name, addr, mask, addr_len, | |
1097 | &audit_info); | |
8cc44579 PM |
1098 | } |
1099 | ||
1100 | /** | |
1101 | * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message | |
1102 | * @skb: the NETLINK buffer | |
1103 | * @info: the Generic NETLINK info block | |
1104 | * | |
1105 | * Description: | |
1106 | * Process a user generated STATICREMOVEDEF message and remove the default | |
1107 | * unlabeled connection entry. Returns zero on success, negative values on | |
1108 | * failure. | |
1109 | * | |
1110 | */ | |
1111 | static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, | |
1112 | struct genl_info *info) | |
1113 | { | |
1114 | int ret_val; | |
1115 | void *addr; | |
1116 | void *mask; | |
1117 | u32 addr_len; | |
13541b3a | 1118 | struct netlbl_audit audit_info; |
8cc44579 PM |
1119 | |
1120 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1121 | * IPv4 and IPv6 in the same entry. */ | |
1122 | if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1123 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1124 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1125 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1126 | return -EINVAL; | |
1127 | ||
13541b3a PM |
1128 | netlbl_netlink_auditinfo(skb, &audit_info); |
1129 | ||
8cc44579 PM |
1130 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1131 | if (ret_val != 0) | |
1132 | return ret_val; | |
1133 | ||
13541b3a PM |
1134 | return netlbl_unlhsh_remove(&init_net, |
1135 | NULL, addr, mask, addr_len, | |
1136 | &audit_info); | |
8cc44579 PM |
1137 | } |
1138 | ||
1139 | ||
1140 | /** | |
1141 | * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] | |
1142 | * @cmd: command/message | |
1143 | * @iface: the interface entry | |
1144 | * @addr4: the IPv4 address entry | |
1145 | * @addr6: the IPv6 address entry | |
1146 | * @arg: the netlbl_unlhsh_walk_arg structure | |
1147 | * | |
1148 | * Description: | |
1149 | * This function is designed to be used to generate a response for a | |
1150 | * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 | |
1151 | * can be specified, not both, the other unspecified entry should be set to | |
1152 | * NULL by the caller. Returns the size of the message on success, negative | |
1153 | * values on failure. | |
1154 | * | |
1155 | */ | |
1156 | static int netlbl_unlabel_staticlist_gen(u32 cmd, | |
1157 | const struct netlbl_unlhsh_iface *iface, | |
1158 | const struct netlbl_unlhsh_addr4 *addr4, | |
1159 | const struct netlbl_unlhsh_addr6 *addr6, | |
1160 | void *arg) | |
1161 | { | |
1162 | int ret_val = -ENOMEM; | |
1163 | struct netlbl_unlhsh_walk_arg *cb_arg = arg; | |
1164 | struct net_device *dev; | |
1165 | void *data; | |
1166 | u32 secid; | |
1167 | char *secctx; | |
1168 | u32 secctx_len; | |
1169 | ||
1170 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid, | |
1171 | cb_arg->seq, &netlbl_unlabel_gnl_family, | |
1172 | NLM_F_MULTI, cmd); | |
1173 | if (data == NULL) | |
1174 | goto list_cb_failure; | |
1175 | ||
1176 | if (iface->ifindex > 0) { | |
1177 | dev = dev_get_by_index(&init_net, iface->ifindex); | |
794eb6bf JJ |
1178 | if (!dev) { |
1179 | ret_val = -ENODEV; | |
1180 | goto list_cb_failure; | |
1181 | } | |
8cc44579 PM |
1182 | ret_val = nla_put_string(cb_arg->skb, |
1183 | NLBL_UNLABEL_A_IFACE, dev->name); | |
1184 | dev_put(dev); | |
1185 | if (ret_val != 0) | |
1186 | goto list_cb_failure; | |
1187 | } | |
1188 | ||
1189 | if (addr4) { | |
1190 | struct in_addr addr_struct; | |
1191 | ||
61e10682 | 1192 | addr_struct.s_addr = addr4->list.addr; |
8cc44579 PM |
1193 | ret_val = nla_put(cb_arg->skb, |
1194 | NLBL_UNLABEL_A_IPV4ADDR, | |
1195 | sizeof(struct in_addr), | |
1196 | &addr_struct); | |
1197 | if (ret_val != 0) | |
1198 | goto list_cb_failure; | |
1199 | ||
61e10682 | 1200 | addr_struct.s_addr = addr4->list.mask; |
8cc44579 PM |
1201 | ret_val = nla_put(cb_arg->skb, |
1202 | NLBL_UNLABEL_A_IPV4MASK, | |
1203 | sizeof(struct in_addr), | |
1204 | &addr_struct); | |
1205 | if (ret_val != 0) | |
1206 | goto list_cb_failure; | |
1207 | ||
1208 | secid = addr4->secid; | |
1209 | } else { | |
1210 | ret_val = nla_put(cb_arg->skb, | |
1211 | NLBL_UNLABEL_A_IPV6ADDR, | |
1212 | sizeof(struct in6_addr), | |
61e10682 | 1213 | &addr6->list.addr); |
8cc44579 PM |
1214 | if (ret_val != 0) |
1215 | goto list_cb_failure; | |
1216 | ||
1217 | ret_val = nla_put(cb_arg->skb, | |
1218 | NLBL_UNLABEL_A_IPV6MASK, | |
1219 | sizeof(struct in6_addr), | |
61e10682 | 1220 | &addr6->list.mask); |
8cc44579 PM |
1221 | if (ret_val != 0) |
1222 | goto list_cb_failure; | |
1223 | ||
1224 | secid = addr6->secid; | |
1225 | } | |
1226 | ||
1227 | ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); | |
1228 | if (ret_val != 0) | |
1229 | goto list_cb_failure; | |
1230 | ret_val = nla_put(cb_arg->skb, | |
1231 | NLBL_UNLABEL_A_SECCTX, | |
1232 | secctx_len, | |
1233 | secctx); | |
1234 | security_release_secctx(secctx, secctx_len); | |
1235 | if (ret_val != 0) | |
1236 | goto list_cb_failure; | |
1237 | ||
1238 | cb_arg->seq++; | |
1239 | return genlmsg_end(cb_arg->skb, data); | |
1240 | ||
1241 | list_cb_failure: | |
1242 | genlmsg_cancel(cb_arg->skb, data); | |
1243 | return ret_val; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * netlbl_unlabel_staticlist - Handle a STATICLIST message | |
1248 | * @skb: the NETLINK buffer | |
1249 | * @cb: the NETLINK callback | |
1250 | * | |
1251 | * Description: | |
1252 | * Process a user generated STATICLIST message and dump the unlabeled | |
1253 | * connection hash table in a form suitable for use in a kernel generated | |
1254 | * STATICLIST message. Returns the length of @skb. | |
1255 | * | |
1256 | */ | |
1257 | static int netlbl_unlabel_staticlist(struct sk_buff *skb, | |
1258 | struct netlink_callback *cb) | |
1259 | { | |
1260 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1261 | u32 skip_bkt = cb->args[0]; | |
1262 | u32 skip_chain = cb->args[1]; | |
1263 | u32 skip_addr4 = cb->args[2]; | |
1264 | u32 skip_addr6 = cb->args[3]; | |
1265 | u32 iter_bkt; | |
1266 | u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; | |
1267 | struct netlbl_unlhsh_iface *iface; | |
56196701 | 1268 | struct list_head *iter_list; |
61e10682 PM |
1269 | struct netlbl_af4list *addr4; |
1270 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1271 | struct netlbl_af6list *addr6; | |
1272 | #endif | |
8cc44579 PM |
1273 | |
1274 | cb_arg.nl_cb = cb; | |
1275 | cb_arg.skb = skb; | |
1276 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1277 | ||
1278 | rcu_read_lock(); | |
1279 | for (iter_bkt = skip_bkt; | |
1280 | iter_bkt < rcu_dereference(netlbl_unlhsh)->size; | |
1281 | iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) { | |
56196701 PM |
1282 | iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; |
1283 | list_for_each_entry_rcu(iface, iter_list, list) { | |
8cc44579 PM |
1284 | if (!iface->valid || |
1285 | iter_chain++ < skip_chain) | |
1286 | continue; | |
61e10682 PM |
1287 | netlbl_af4list_foreach_rcu(addr4, |
1288 | &iface->addr4_list) { | |
1289 | if (iter_addr4++ < skip_addr4) | |
8cc44579 PM |
1290 | continue; |
1291 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1292 | NLBL_UNLABEL_C_STATICLIST, |
1293 | iface, | |
1294 | netlbl_unlhsh_addr4_entry(addr4), | |
1295 | NULL, | |
1296 | &cb_arg) < 0) { | |
8cc44579 PM |
1297 | iter_addr4--; |
1298 | iter_chain--; | |
1299 | goto unlabel_staticlist_return; | |
1300 | } | |
1301 | } | |
61e10682 PM |
1302 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1303 | netlbl_af6list_foreach_rcu(addr6, | |
1304 | &iface->addr6_list) { | |
1305 | if (iter_addr6++ < skip_addr6) | |
8cc44579 PM |
1306 | continue; |
1307 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1308 | NLBL_UNLABEL_C_STATICLIST, |
1309 | iface, | |
1310 | NULL, | |
1311 | netlbl_unlhsh_addr6_entry(addr6), | |
1312 | &cb_arg) < 0) { | |
8cc44579 PM |
1313 | iter_addr6--; |
1314 | iter_chain--; | |
1315 | goto unlabel_staticlist_return; | |
1316 | } | |
1317 | } | |
61e10682 | 1318 | #endif /* IPv6 */ |
8cc44579 PM |
1319 | } |
1320 | } | |
1321 | ||
1322 | unlabel_staticlist_return: | |
1323 | rcu_read_unlock(); | |
1324 | cb->args[0] = skip_bkt; | |
1325 | cb->args[1] = skip_chain; | |
1326 | cb->args[2] = skip_addr4; | |
1327 | cb->args[3] = skip_addr6; | |
1328 | return skb->len; | |
1329 | } | |
1330 | ||
1331 | /** | |
1332 | * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message | |
1333 | * @skb: the NETLINK buffer | |
1334 | * @cb: the NETLINK callback | |
1335 | * | |
1336 | * Description: | |
1337 | * Process a user generated STATICLISTDEF message and dump the default | |
1338 | * unlabeled connection entry in a form suitable for use in a kernel generated | |
1339 | * STATICLISTDEF message. Returns the length of @skb. | |
1340 | * | |
1341 | */ | |
1342 | static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, | |
1343 | struct netlink_callback *cb) | |
1344 | { | |
1345 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1346 | struct netlbl_unlhsh_iface *iface; | |
1347 | u32 skip_addr4 = cb->args[0]; | |
1348 | u32 skip_addr6 = cb->args[1]; | |
61e10682 PM |
1349 | u32 iter_addr4 = 0; |
1350 | struct netlbl_af4list *addr4; | |
1351 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1352 | u32 iter_addr6 = 0; | |
1353 | struct netlbl_af6list *addr6; | |
1354 | #endif | |
8cc44579 PM |
1355 | |
1356 | cb_arg.nl_cb = cb; | |
1357 | cb_arg.skb = skb; | |
1358 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1359 | ||
1360 | rcu_read_lock(); | |
1361 | iface = rcu_dereference(netlbl_unlhsh_def); | |
1362 | if (iface == NULL || !iface->valid) | |
1363 | goto unlabel_staticlistdef_return; | |
1364 | ||
61e10682 PM |
1365 | netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
1366 | if (iter_addr4++ < skip_addr4) | |
8cc44579 PM |
1367 | continue; |
1368 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1369 | iface, |
1370 | netlbl_unlhsh_addr4_entry(addr4), | |
1371 | NULL, | |
1372 | &cb_arg) < 0) { | |
8cc44579 PM |
1373 | iter_addr4--; |
1374 | goto unlabel_staticlistdef_return; | |
1375 | } | |
1376 | } | |
61e10682 PM |
1377 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1378 | netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { | |
1379 | if (iter_addr6++ < skip_addr6) | |
8cc44579 PM |
1380 | continue; |
1381 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1382 | iface, |
1383 | NULL, | |
1384 | netlbl_unlhsh_addr6_entry(addr6), | |
1385 | &cb_arg) < 0) { | |
8cc44579 PM |
1386 | iter_addr6--; |
1387 | goto unlabel_staticlistdef_return; | |
1388 | } | |
1389 | } | |
61e10682 | 1390 | #endif /* IPv6 */ |
8cc44579 PM |
1391 | |
1392 | unlabel_staticlistdef_return: | |
1393 | rcu_read_unlock(); | |
1394 | cb->args[0] = skip_addr4; | |
1395 | cb->args[1] = skip_addr6; | |
1396 | return skb->len; | |
1397 | } | |
96cb8e33 PM |
1398 | |
1399 | /* | |
1400 | * NetLabel Generic NETLINK Command Definitions | |
1401 | */ | |
1402 | ||
227c43c3 PE |
1403 | static struct genl_ops netlbl_unlabel_genl_ops[] = { |
1404 | { | |
8cc44579 PM |
1405 | .cmd = NLBL_UNLABEL_C_STATICADD, |
1406 | .flags = GENL_ADMIN_PERM, | |
1407 | .policy = netlbl_unlabel_genl_policy, | |
1408 | .doit = netlbl_unlabel_staticadd, | |
1409 | .dumpit = NULL, | |
227c43c3 PE |
1410 | }, |
1411 | { | |
8cc44579 PM |
1412 | .cmd = NLBL_UNLABEL_C_STATICREMOVE, |
1413 | .flags = GENL_ADMIN_PERM, | |
1414 | .policy = netlbl_unlabel_genl_policy, | |
1415 | .doit = netlbl_unlabel_staticremove, | |
1416 | .dumpit = NULL, | |
227c43c3 PE |
1417 | }, |
1418 | { | |
8cc44579 PM |
1419 | .cmd = NLBL_UNLABEL_C_STATICLIST, |
1420 | .flags = 0, | |
1421 | .policy = netlbl_unlabel_genl_policy, | |
1422 | .doit = NULL, | |
1423 | .dumpit = netlbl_unlabel_staticlist, | |
227c43c3 PE |
1424 | }, |
1425 | { | |
8cc44579 PM |
1426 | .cmd = NLBL_UNLABEL_C_STATICADDDEF, |
1427 | .flags = GENL_ADMIN_PERM, | |
1428 | .policy = netlbl_unlabel_genl_policy, | |
1429 | .doit = netlbl_unlabel_staticadddef, | |
1430 | .dumpit = NULL, | |
227c43c3 PE |
1431 | }, |
1432 | { | |
8cc44579 PM |
1433 | .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, |
1434 | .flags = GENL_ADMIN_PERM, | |
1435 | .policy = netlbl_unlabel_genl_policy, | |
1436 | .doit = netlbl_unlabel_staticremovedef, | |
1437 | .dumpit = NULL, | |
227c43c3 PE |
1438 | }, |
1439 | { | |
8cc44579 PM |
1440 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
1441 | .flags = 0, | |
1442 | .policy = netlbl_unlabel_genl_policy, | |
1443 | .doit = NULL, | |
1444 | .dumpit = netlbl_unlabel_staticlistdef, | |
227c43c3 PE |
1445 | }, |
1446 | { | |
96cb8e33 | 1447 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
fd385855 PM |
1448 | .flags = GENL_ADMIN_PERM, |
1449 | .policy = netlbl_unlabel_genl_policy, | |
96cb8e33 PM |
1450 | .doit = netlbl_unlabel_accept, |
1451 | .dumpit = NULL, | |
227c43c3 PE |
1452 | }, |
1453 | { | |
96cb8e33 PM |
1454 | .cmd = NLBL_UNLABEL_C_LIST, |
1455 | .flags = 0, | |
fd385855 | 1456 | .policy = netlbl_unlabel_genl_policy, |
96cb8e33 PM |
1457 | .doit = netlbl_unlabel_list, |
1458 | .dumpit = NULL, | |
227c43c3 | 1459 | }, |
96cb8e33 PM |
1460 | }; |
1461 | ||
96cb8e33 PM |
1462 | /* |
1463 | * NetLabel Generic NETLINK Protocol Functions | |
1464 | */ | |
1465 | ||
1466 | /** | |
1467 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
1468 | * | |
1469 | * Description: | |
1470 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
1471 | * mechanism. Returns zero on success, negative values on failure. | |
1472 | * | |
1473 | */ | |
05705e4e | 1474 | int __init netlbl_unlabel_genl_init(void) |
96cb8e33 | 1475 | { |
7ae740df MM |
1476 | return genl_register_family_with_ops(&netlbl_unlabel_gnl_family, |
1477 | netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops)); | |
96cb8e33 PM |
1478 | } |
1479 | ||
1480 | /* | |
1481 | * NetLabel KAPI Hooks | |
1482 | */ | |
1483 | ||
8cc44579 PM |
1484 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1485 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1486 | }; | |
1487 | ||
1488 | /** | |
1489 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1490 | * @size: the number of bits to use for the hash buckets | |
1491 | * | |
1492 | * Description: | |
1493 | * Initializes the unlabeled connection hash table and registers a network | |
1494 | * device notification handler. This function should only be called by the | |
1495 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1496 | * non-zero values on error. | |
1497 | * | |
1498 | */ | |
05705e4e | 1499 | int __init netlbl_unlabel_init(u32 size) |
8cc44579 PM |
1500 | { |
1501 | u32 iter; | |
1502 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1503 | ||
1504 | if (size == 0) | |
1505 | return -EINVAL; | |
1506 | ||
1507 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1508 | if (hsh_tbl == NULL) | |
1509 | return -ENOMEM; | |
1510 | hsh_tbl->size = 1 << size; | |
1511 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1512 | sizeof(struct list_head), | |
1513 | GFP_KERNEL); | |
1514 | if (hsh_tbl->tbl == NULL) { | |
1515 | kfree(hsh_tbl); | |
1516 | return -ENOMEM; | |
1517 | } | |
1518 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1519 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1520 | ||
1521 | rcu_read_lock(); | |
1522 | spin_lock(&netlbl_unlhsh_lock); | |
1523 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); | |
1524 | spin_unlock(&netlbl_unlhsh_lock); | |
1525 | rcu_read_unlock(); | |
1526 | ||
1527 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1528 | ||
1529 | return 0; | |
1530 | } | |
1531 | ||
96cb8e33 PM |
1532 | /** |
1533 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1534 | * @skb: the packet |
1535 | * @family: protocol family | |
96cb8e33 PM |
1536 | * @secattr: the security attributes |
1537 | * | |
1538 | * Description: | |
1539 | * Determine the security attributes, if any, for an unlabled packet and return | |
1540 | * them in @secattr. Returns zero on success and negative values on failure. | |
1541 | * | |
1542 | */ | |
8cc44579 PM |
1543 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1544 | u16 family, | |
1545 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1546 | { |
8cc44579 PM |
1547 | struct netlbl_unlhsh_iface *iface; |
1548 | ||
1549 | rcu_read_lock(); | |
8964be4a | 1550 | iface = netlbl_unlhsh_search_iface_def(skb->skb_iif); |
8cc44579 PM |
1551 | if (iface == NULL) |
1552 | goto unlabel_getattr_nolabel; | |
1553 | switch (family) { | |
56628b1d PE |
1554 | case PF_INET: { |
1555 | struct iphdr *hdr4; | |
61e10682 | 1556 | struct netlbl_af4list *addr4; |
56628b1d | 1557 | |
8cc44579 | 1558 | hdr4 = ip_hdr(skb); |
61e10682 PM |
1559 | addr4 = netlbl_af4list_search(hdr4->saddr, |
1560 | &iface->addr4_list); | |
8cc44579 PM |
1561 | if (addr4 == NULL) |
1562 | goto unlabel_getattr_nolabel; | |
61e10682 | 1563 | secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
8cc44579 | 1564 | break; |
56628b1d | 1565 | } |
8cc44579 | 1566 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
56628b1d PE |
1567 | case PF_INET6: { |
1568 | struct ipv6hdr *hdr6; | |
61e10682 | 1569 | struct netlbl_af6list *addr6; |
56628b1d | 1570 | |
8cc44579 | 1571 | hdr6 = ipv6_hdr(skb); |
61e10682 PM |
1572 | addr6 = netlbl_af6list_search(&hdr6->saddr, |
1573 | &iface->addr6_list); | |
8cc44579 PM |
1574 | if (addr6 == NULL) |
1575 | goto unlabel_getattr_nolabel; | |
61e10682 | 1576 | secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; |
8cc44579 | 1577 | break; |
56628b1d | 1578 | } |
8cc44579 PM |
1579 | #endif /* IPv6 */ |
1580 | default: | |
1581 | goto unlabel_getattr_nolabel; | |
1582 | } | |
1583 | rcu_read_unlock(); | |
1584 | ||
1585 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1586 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1587 | return 0; | |
1588 | ||
1589 | unlabel_getattr_nolabel: | |
1590 | rcu_read_unlock(); | |
c783f1ce PM |
1591 | if (netlabel_unlabel_acceptflg == 0) |
1592 | return -ENOMSG; | |
16efd454 | 1593 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1594 | return 0; |
96cb8e33 PM |
1595 | } |
1596 | ||
1597 | /** | |
1598 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1599 | * | |
1600 | * Description: | |
1601 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1602 | * and to send unlabeled network traffic by default. | |
1603 | * | |
1604 | */ | |
05705e4e | 1605 | int __init netlbl_unlabel_defconf(void) |
96cb8e33 PM |
1606 | { |
1607 | int ret_val; | |
1608 | struct netlbl_dom_map *entry; | |
95d4e6be | 1609 | struct netlbl_audit audit_info; |
32f50cde | 1610 | |
95d4e6be PM |
1611 | /* Only the kernel is allowed to call this function and the only time |
1612 | * it is called is at bootup before the audit subsystem is reporting | |
1613 | * messages so don't worry to much about these values. */ | |
1614 | security_task_getsecid(current, &audit_info.secid); | |
1615 | audit_info.loginuid = 0; | |
2532386f | 1616 | audit_info.sessionid = 0; |
96cb8e33 PM |
1617 | |
1618 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1619 | if (entry == NULL) | |
1620 | return -ENOMEM; | |
1621 | entry->type = NETLBL_NLTYPE_UNLABELED; | |
95d4e6be | 1622 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1623 | if (ret_val != 0) |
1624 | return ret_val; | |
1625 | ||
95d4e6be | 1626 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1627 | |
1628 | return 0; | |
1629 | } |