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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 | /* | |
8cc44579 | 13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2007 |
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" | |
57 | #include "netlabel_domainhash.h" | |
58 | #include "netlabel_unlabeled.h" | |
8cc44579 PM |
59 | #include "netlabel_mgmt.h" |
60 | ||
61 | /* NOTE: at present we always use init's network namespace since we don't | |
62 | * presently support different namespaces even though the majority of | |
63 | * the functions in this file are "namespace safe" */ | |
64 | ||
65 | /* The unlabeled connection hash table which we use to map network interfaces | |
66 | * and addresses of unlabeled packets to a user specified secid value for the | |
67 | * LSM. The hash table is used to lookup the network interface entry | |
68 | * (struct netlbl_unlhsh_iface) and then the interface entry is used to | |
69 | * lookup an IP address match from an ordered list. If a network interface | |
70 | * match can not be found in the hash table then the default entry | |
71 | * (netlbl_unlhsh_def) is used. The IP address entry list | |
72 | * (struct netlbl_unlhsh_addr) is ordered such that the entries with a | |
73 | * larger netmask come first. | |
74 | */ | |
75 | struct netlbl_unlhsh_tbl { | |
76 | struct list_head *tbl; | |
77 | u32 size; | |
78 | }; | |
79 | struct netlbl_unlhsh_addr4 { | |
80 | __be32 addr; | |
81 | __be32 mask; | |
82 | u32 secid; | |
83 | ||
84 | u32 valid; | |
85 | struct list_head list; | |
86 | struct rcu_head rcu; | |
87 | }; | |
88 | struct netlbl_unlhsh_addr6 { | |
89 | struct in6_addr addr; | |
90 | struct in6_addr mask; | |
91 | u32 secid; | |
92 | ||
93 | u32 valid; | |
94 | struct list_head list; | |
95 | struct rcu_head rcu; | |
96 | }; | |
97 | struct netlbl_unlhsh_iface { | |
98 | int ifindex; | |
99 | struct list_head addr4_list; | |
100 | struct list_head addr6_list; | |
101 | ||
102 | u32 valid; | |
103 | struct list_head list; | |
104 | struct rcu_head rcu; | |
105 | }; | |
106 | ||
107 | /* Argument struct for netlbl_unlhsh_walk() */ | |
108 | struct netlbl_unlhsh_walk_arg { | |
109 | struct netlink_callback *nl_cb; | |
110 | struct sk_buff *skb; | |
111 | u32 seq; | |
112 | }; | |
113 | ||
114 | /* Unlabeled connection hash table */ | |
115 | /* updates should be so rare that having one spinlock for the entire | |
116 | * hash table should be okay */ | |
117 | static DEFINE_SPINLOCK(netlbl_unlhsh_lock); | |
118 | 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 | |
13541b3a PM |
149 | /* |
150 | * Audit Helper Functions | |
151 | */ | |
152 | ||
153 | /** | |
154 | * netlbl_unlabel_audit_addr4 - Audit an IPv4 address | |
155 | * @audit_buf: audit buffer | |
156 | * @dev: network interface | |
157 | * @addr: IP address | |
158 | * @mask: IP address mask | |
159 | * | |
160 | * Description: | |
161 | * Write the IPv4 address and address mask, if necessary, to @audit_buf. | |
162 | * | |
163 | */ | |
164 | static void netlbl_unlabel_audit_addr4(struct audit_buffer *audit_buf, | |
165 | const char *dev, | |
166 | __be32 addr, __be32 mask) | |
167 | { | |
168 | u32 mask_val = ntohl(mask); | |
169 | ||
170 | if (dev != NULL) | |
171 | audit_log_format(audit_buf, " netif=%s", dev); | |
172 | audit_log_format(audit_buf, " src=" NIPQUAD_FMT, NIPQUAD(addr)); | |
173 | if (mask_val != 0xffffffff) { | |
174 | u32 mask_len = 0; | |
175 | while (mask_val > 0) { | |
176 | mask_val <<= 1; | |
177 | mask_len++; | |
178 | } | |
179 | audit_log_format(audit_buf, " src_prefixlen=%d", mask_len); | |
180 | } | |
181 | } | |
182 | ||
183 | /** | |
184 | * netlbl_unlabel_audit_addr6 - Audit an IPv6 address | |
185 | * @audit_buf: audit buffer | |
186 | * @dev: network interface | |
187 | * @addr: IP address | |
188 | * @mask: IP address mask | |
189 | * | |
190 | * Description: | |
191 | * Write the IPv6 address and address mask, if necessary, to @audit_buf. | |
192 | * | |
193 | */ | |
194 | static void netlbl_unlabel_audit_addr6(struct audit_buffer *audit_buf, | |
195 | const char *dev, | |
196 | const struct in6_addr *addr, | |
197 | const struct in6_addr *mask) | |
198 | { | |
199 | if (dev != NULL) | |
200 | audit_log_format(audit_buf, " netif=%s", dev); | |
201 | audit_log_format(audit_buf, " src=" NIP6_FMT, NIP6(*addr)); | |
202 | if (ntohl(mask->s6_addr32[3]) != 0xffffffff) { | |
203 | u32 mask_len = 0; | |
204 | u32 mask_val; | |
205 | int iter = -1; | |
206 | while (ntohl(mask->s6_addr32[++iter]) == 0xffffffff) | |
207 | mask_len += 32; | |
208 | mask_val = ntohl(mask->s6_addr32[iter]); | |
209 | while (mask_val > 0) { | |
210 | mask_val <<= 1; | |
211 | mask_len++; | |
212 | } | |
213 | audit_log_format(audit_buf, " src_prefixlen=%d", mask_len); | |
214 | } | |
215 | } | |
216 | ||
32f50cde | 217 | /* |
8cc44579 PM |
218 | * Unlabeled Connection Hash Table Functions |
219 | */ | |
220 | ||
221 | /** | |
222 | * netlbl_unlhsh_free_addr4 - Frees an IPv4 address entry from the hash table | |
223 | * @entry: the entry's RCU field | |
224 | * | |
225 | * Description: | |
226 | * This function is designed to be used as a callback to the call_rcu() | |
227 | * function so that memory allocated to a hash table address entry can be | |
228 | * released safely. | |
229 | * | |
230 | */ | |
231 | static void netlbl_unlhsh_free_addr4(struct rcu_head *entry) | |
232 | { | |
233 | struct netlbl_unlhsh_addr4 *ptr; | |
234 | ||
235 | ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu); | |
236 | kfree(ptr); | |
237 | } | |
238 | ||
239 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
240 | /** | |
241 | * netlbl_unlhsh_free_addr6 - Frees an IPv6 address entry from the hash table | |
242 | * @entry: the entry's RCU field | |
243 | * | |
244 | * Description: | |
245 | * This function is designed to be used as a callback to the call_rcu() | |
246 | * function so that memory allocated to a hash table address entry can be | |
247 | * released safely. | |
248 | * | |
249 | */ | |
250 | static void netlbl_unlhsh_free_addr6(struct rcu_head *entry) | |
251 | { | |
252 | struct netlbl_unlhsh_addr6 *ptr; | |
253 | ||
254 | ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu); | |
255 | kfree(ptr); | |
256 | } | |
257 | #endif /* IPv6 */ | |
258 | ||
259 | /** | |
260 | * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table | |
261 | * @entry: the entry's RCU field | |
262 | * | |
263 | * Description: | |
264 | * This function is designed to be used as a callback to the call_rcu() | |
265 | * function so that memory allocated to a hash table interface entry can be | |
266 | * released safely. It is important to note that this function does not free | |
267 | * the IPv4 and IPv6 address lists contained as part of an interface entry. It | |
268 | * is up to the rest of the code to make sure an interface entry is only freed | |
269 | * once it's address lists are empty. | |
270 | * | |
271 | */ | |
272 | static void netlbl_unlhsh_free_iface(struct rcu_head *entry) | |
273 | { | |
274 | struct netlbl_unlhsh_iface *iface; | |
275 | struct netlbl_unlhsh_addr4 *iter4; | |
276 | struct netlbl_unlhsh_addr4 *tmp4; | |
277 | struct netlbl_unlhsh_addr6 *iter6; | |
278 | struct netlbl_unlhsh_addr6 *tmp6; | |
279 | ||
280 | iface = container_of(entry, struct netlbl_unlhsh_iface, rcu); | |
281 | ||
282 | /* no need for locks here since we are the only one with access to this | |
283 | * structure */ | |
284 | ||
285 | list_for_each_entry_safe(iter4, tmp4, &iface->addr4_list, list) | |
286 | if (iter4->valid) { | |
287 | list_del_rcu(&iter4->list); | |
288 | kfree(iter4); | |
289 | } | |
290 | list_for_each_entry_safe(iter6, tmp6, &iface->addr6_list, list) | |
291 | if (iter6->valid) { | |
292 | list_del_rcu(&iter6->list); | |
293 | kfree(iter6); | |
294 | } | |
295 | kfree(iface); | |
296 | } | |
297 | ||
298 | /** | |
299 | * netlbl_unlhsh_hash - Hashing function for the hash table | |
300 | * @ifindex: the network interface/device to hash | |
301 | * | |
302 | * Description: | |
303 | * This is the hashing function for the unlabeled hash table, it returns the | |
304 | * bucket number for the given device/interface. The caller is responsible for | |
305 | * calling the rcu_read_[un]lock() functions. | |
306 | * | |
307 | */ | |
308 | static u32 netlbl_unlhsh_hash(int ifindex) | |
309 | { | |
310 | /* this is taken _almost_ directly from | |
311 | * security/selinux/netif.c:sel_netif_hasfn() as they do pretty much | |
312 | * the same thing */ | |
313 | return ifindex & (rcu_dereference(netlbl_unlhsh)->size - 1); | |
314 | } | |
315 | ||
316 | /** | |
317 | * netlbl_unlhsh_search_addr4 - Search for a matching IPv4 address entry | |
318 | * @addr: IPv4 address | |
319 | * @iface: the network interface entry | |
320 | * | |
321 | * Description: | |
322 | * Searches the IPv4 address list of the network interface specified by @iface. | |
323 | * If a matching address entry is found it is returned, otherwise NULL is | |
324 | * returned. The caller is responsible for calling the rcu_read_[un]lock() | |
325 | * functions. | |
326 | * | |
327 | */ | |
328 | static struct netlbl_unlhsh_addr4 *netlbl_unlhsh_search_addr4( | |
329 | __be32 addr, | |
330 | const struct netlbl_unlhsh_iface *iface) | |
331 | { | |
332 | struct netlbl_unlhsh_addr4 *iter; | |
333 | ||
334 | list_for_each_entry_rcu(iter, &iface->addr4_list, list) | |
335 | if (iter->valid && (addr & iter->mask) == iter->addr) | |
336 | return iter; | |
337 | ||
338 | return NULL; | |
339 | } | |
340 | ||
341 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
342 | /** | |
343 | * netlbl_unlhsh_search_addr6 - Search for a matching IPv6 address entry | |
344 | * @addr: IPv6 address | |
345 | * @iface: the network interface entry | |
346 | * | |
347 | * Description: | |
348 | * Searches the IPv6 address list of the network interface specified by @iface. | |
349 | * If a matching address entry is found it is returned, otherwise NULL is | |
350 | * returned. The caller is responsible for calling the rcu_read_[un]lock() | |
351 | * functions. | |
352 | * | |
353 | */ | |
354 | static struct netlbl_unlhsh_addr6 *netlbl_unlhsh_search_addr6( | |
355 | const struct in6_addr *addr, | |
356 | const struct netlbl_unlhsh_iface *iface) | |
357 | { | |
358 | struct netlbl_unlhsh_addr6 *iter; | |
359 | ||
360 | list_for_each_entry_rcu(iter, &iface->addr6_list, list) | |
361 | if (iter->valid && | |
362 | ipv6_masked_addr_cmp(&iter->addr, &iter->mask, addr) == 0) | |
363 | return iter; | |
364 | ||
365 | return NULL; | |
366 | } | |
367 | #endif /* IPv6 */ | |
368 | ||
369 | /** | |
370 | * netlbl_unlhsh_search_iface - Search for a matching interface entry | |
371 | * @ifindex: the network interface | |
372 | * | |
373 | * Description: | |
374 | * Searches the unlabeled connection hash table and returns a pointer to the | |
375 | * interface entry which matches @ifindex, otherwise NULL is returned. The | |
376 | * caller is responsible for calling the rcu_read_[un]lock() functions. | |
377 | * | |
378 | */ | |
379 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex) | |
380 | { | |
381 | u32 bkt; | |
382 | struct netlbl_unlhsh_iface *iter; | |
383 | ||
384 | bkt = netlbl_unlhsh_hash(ifindex); | |
385 | list_for_each_entry_rcu(iter, | |
386 | &rcu_dereference(netlbl_unlhsh)->tbl[bkt], | |
387 | list) | |
388 | if (iter->valid && iter->ifindex == ifindex) | |
389 | return iter; | |
390 | ||
391 | return NULL; | |
392 | } | |
393 | ||
394 | /** | |
395 | * netlbl_unlhsh_search_iface_def - Search for a matching interface entry | |
396 | * @ifindex: the network interface | |
397 | * | |
398 | * Description: | |
399 | * Searches the unlabeled connection hash table and returns a pointer to the | |
400 | * interface entry which matches @ifindex. If an exact match can not be found | |
401 | * and there is a valid default entry, the default entry is returned, otherwise | |
402 | * NULL is returned. The caller is responsible for calling the | |
403 | * rcu_read_[un]lock() functions. | |
404 | * | |
405 | */ | |
406 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface_def(int ifindex) | |
407 | { | |
408 | struct netlbl_unlhsh_iface *entry; | |
409 | ||
410 | entry = netlbl_unlhsh_search_iface(ifindex); | |
411 | if (entry != NULL) | |
412 | return entry; | |
413 | ||
414 | entry = rcu_dereference(netlbl_unlhsh_def); | |
415 | if (entry != NULL && entry->valid) | |
416 | return entry; | |
417 | ||
418 | return NULL; | |
419 | } | |
420 | ||
421 | /** | |
422 | * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table | |
423 | * @iface: the associated interface entry | |
424 | * @addr: IPv4 address in network byte order | |
425 | * @mask: IPv4 address mask in network byte order | |
426 | * @secid: LSM secid value for entry | |
427 | * | |
428 | * Description: | |
429 | * Add a new address entry into the unlabeled connection hash table using the | |
430 | * interface entry specified by @iface. On success zero is returned, otherwise | |
431 | * a negative value is returned. The caller is responsible for calling the | |
432 | * rcu_read_[un]lock() functions. | |
433 | * | |
32f50cde | 434 | */ |
8cc44579 PM |
435 | static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, |
436 | const struct in_addr *addr, | |
437 | const struct in_addr *mask, | |
438 | u32 secid) | |
439 | { | |
440 | struct netlbl_unlhsh_addr4 *entry; | |
441 | struct netlbl_unlhsh_addr4 *iter; | |
442 | ||
443 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
444 | if (entry == NULL) | |
445 | return -ENOMEM; | |
446 | ||
447 | entry->addr = addr->s_addr & mask->s_addr; | |
448 | entry->mask = mask->s_addr; | |
449 | entry->secid = secid; | |
450 | entry->valid = 1; | |
451 | INIT_RCU_HEAD(&entry->rcu); | |
452 | ||
453 | spin_lock(&netlbl_unlhsh_lock); | |
454 | iter = netlbl_unlhsh_search_addr4(entry->addr, iface); | |
455 | if (iter != NULL && | |
456 | iter->addr == addr->s_addr && iter->mask == mask->s_addr) { | |
457 | spin_unlock(&netlbl_unlhsh_lock); | |
458 | kfree(entry); | |
459 | return -EEXIST; | |
460 | } | |
461 | /* in order to speed up address searches through the list (the common | |
462 | * case) we need to keep the list in order based on the size of the | |
463 | * address mask such that the entry with the widest mask (smallest | |
464 | * numerical value) appears first in the list */ | |
465 | list_for_each_entry_rcu(iter, &iface->addr4_list, list) | |
466 | if (iter->valid && | |
467 | ntohl(entry->mask) > ntohl(iter->mask)) { | |
468 | __list_add_rcu(&entry->list, | |
469 | iter->list.prev, | |
470 | &iter->list); | |
471 | spin_unlock(&netlbl_unlhsh_lock); | |
472 | return 0; | |
473 | } | |
474 | list_add_tail_rcu(&entry->list, &iface->addr4_list); | |
475 | spin_unlock(&netlbl_unlhsh_lock); | |
476 | return 0; | |
477 | } | |
478 | ||
479 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
480 | /** | |
481 | * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table | |
482 | * @iface: the associated interface entry | |
483 | * @addr: IPv6 address in network byte order | |
484 | * @mask: IPv6 address mask in network byte order | |
485 | * @secid: LSM secid value for entry | |
486 | * | |
487 | * Description: | |
488 | * Add a new address entry into the unlabeled connection hash table using the | |
489 | * interface entry specified by @iface. On success zero is returned, otherwise | |
490 | * a negative value is returned. The caller is responsible for calling the | |
491 | * rcu_read_[un]lock() functions. | |
492 | * | |
493 | */ | |
494 | static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, | |
495 | const struct in6_addr *addr, | |
496 | const struct in6_addr *mask, | |
497 | u32 secid) | |
498 | { | |
499 | struct netlbl_unlhsh_addr6 *entry; | |
500 | struct netlbl_unlhsh_addr6 *iter; | |
501 | ||
502 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
503 | if (entry == NULL) | |
504 | return -ENOMEM; | |
505 | ||
506 | ipv6_addr_copy(&entry->addr, addr); | |
507 | entry->addr.s6_addr32[0] &= mask->s6_addr32[0]; | |
508 | entry->addr.s6_addr32[1] &= mask->s6_addr32[1]; | |
509 | entry->addr.s6_addr32[2] &= mask->s6_addr32[2]; | |
510 | entry->addr.s6_addr32[3] &= mask->s6_addr32[3]; | |
511 | ipv6_addr_copy(&entry->mask, mask); | |
512 | entry->secid = secid; | |
513 | entry->valid = 1; | |
514 | INIT_RCU_HEAD(&entry->rcu); | |
515 | ||
516 | spin_lock(&netlbl_unlhsh_lock); | |
517 | iter = netlbl_unlhsh_search_addr6(&entry->addr, iface); | |
518 | if (iter != NULL && | |
519 | (ipv6_addr_equal(&iter->addr, addr) && | |
520 | ipv6_addr_equal(&iter->mask, mask))) { | |
521 | spin_unlock(&netlbl_unlhsh_lock); | |
522 | kfree(entry); | |
523 | return -EEXIST; | |
524 | } | |
525 | /* in order to speed up address searches through the list (the common | |
526 | * case) we need to keep the list in order based on the size of the | |
527 | * address mask such that the entry with the widest mask (smallest | |
528 | * numerical value) appears first in the list */ | |
529 | list_for_each_entry_rcu(iter, &iface->addr6_list, list) | |
530 | if (iter->valid && | |
531 | ipv6_addr_cmp(&entry->mask, &iter->mask) > 0) { | |
532 | __list_add_rcu(&entry->list, | |
533 | iter->list.prev, | |
534 | &iter->list); | |
535 | spin_unlock(&netlbl_unlhsh_lock); | |
536 | return 0; | |
537 | } | |
538 | list_add_tail_rcu(&entry->list, &iface->addr6_list); | |
539 | spin_unlock(&netlbl_unlhsh_lock); | |
540 | return 0; | |
541 | } | |
542 | #endif /* IPv6 */ | |
543 | ||
544 | /** | |
545 | * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table | |
546 | * @ifindex: network interface | |
547 | * | |
548 | * Description: | |
549 | * Add a new, empty, interface entry into the unlabeled connection hash table. | |
550 | * On success a pointer to the new interface entry is returned, on failure NULL | |
551 | * is returned. The caller is responsible for calling the rcu_read_[un]lock() | |
552 | * functions. | |
553 | * | |
554 | */ | |
555 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) | |
556 | { | |
557 | u32 bkt; | |
558 | struct netlbl_unlhsh_iface *iface; | |
559 | ||
560 | iface = kzalloc(sizeof(*iface), GFP_ATOMIC); | |
561 | if (iface == NULL) | |
562 | return NULL; | |
563 | ||
564 | iface->ifindex = ifindex; | |
565 | INIT_LIST_HEAD(&iface->addr4_list); | |
566 | INIT_LIST_HEAD(&iface->addr6_list); | |
567 | iface->valid = 1; | |
568 | INIT_RCU_HEAD(&iface->rcu); | |
569 | ||
570 | spin_lock(&netlbl_unlhsh_lock); | |
571 | if (ifindex > 0) { | |
572 | bkt = netlbl_unlhsh_hash(ifindex); | |
573 | if (netlbl_unlhsh_search_iface(ifindex) != NULL) | |
574 | goto add_iface_failure; | |
575 | list_add_tail_rcu(&iface->list, | |
576 | &rcu_dereference(netlbl_unlhsh)->tbl[bkt]); | |
577 | } else { | |
578 | INIT_LIST_HEAD(&iface->list); | |
579 | if (rcu_dereference(netlbl_unlhsh_def) != NULL) | |
580 | goto add_iface_failure; | |
581 | rcu_assign_pointer(netlbl_unlhsh_def, iface); | |
582 | } | |
583 | spin_unlock(&netlbl_unlhsh_lock); | |
584 | ||
585 | return iface; | |
586 | ||
587 | add_iface_failure: | |
588 | spin_unlock(&netlbl_unlhsh_lock); | |
589 | kfree(iface); | |
590 | return NULL; | |
591 | } | |
592 | ||
593 | /** | |
594 | * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table | |
595 | * @net: network namespace | |
596 | * @dev_name: interface name | |
597 | * @addr: IP address in network byte order | |
598 | * @mask: address mask in network byte order | |
599 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
600 | * @secid: LSM secid value for the entry | |
13541b3a | 601 | * @audit_info: NetLabel audit information |
8cc44579 PM |
602 | * |
603 | * Description: | |
604 | * Adds a new entry to the unlabeled connection hash table. Returns zero on | |
605 | * success, negative values on failure. | |
606 | * | |
607 | */ | |
608 | static int netlbl_unlhsh_add(struct net *net, | |
609 | const char *dev_name, | |
610 | const void *addr, | |
611 | const void *mask, | |
612 | u32 addr_len, | |
13541b3a PM |
613 | u32 secid, |
614 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
615 | { |
616 | int ret_val; | |
617 | int ifindex; | |
618 | struct net_device *dev; | |
619 | struct netlbl_unlhsh_iface *iface; | |
13541b3a PM |
620 | struct audit_buffer *audit_buf = NULL; |
621 | char *secctx = NULL; | |
622 | u32 secctx_len; | |
8cc44579 PM |
623 | |
624 | if (addr_len != sizeof(struct in_addr) && | |
625 | addr_len != sizeof(struct in6_addr)) | |
626 | return -EINVAL; | |
627 | ||
628 | rcu_read_lock(); | |
629 | if (dev_name != NULL) { | |
630 | dev = dev_get_by_name(net, dev_name); | |
631 | if (dev == NULL) { | |
632 | ret_val = -ENODEV; | |
633 | goto unlhsh_add_return; | |
634 | } | |
635 | ifindex = dev->ifindex; | |
636 | dev_put(dev); | |
637 | iface = netlbl_unlhsh_search_iface(ifindex); | |
638 | } else { | |
639 | ifindex = 0; | |
640 | iface = rcu_dereference(netlbl_unlhsh_def); | |
641 | } | |
642 | if (iface == NULL) { | |
643 | iface = netlbl_unlhsh_add_iface(ifindex); | |
644 | if (iface == NULL) { | |
645 | ret_val = -ENOMEM; | |
646 | goto unlhsh_add_return; | |
647 | } | |
648 | } | |
13541b3a PM |
649 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, |
650 | audit_info); | |
8cc44579 | 651 | switch (addr_len) { |
56628b1d PE |
652 | case sizeof(struct in_addr): { |
653 | struct in_addr *addr4, *mask4; | |
654 | ||
13541b3a PM |
655 | addr4 = (struct in_addr *)addr; |
656 | mask4 = (struct in_addr *)mask; | |
657 | ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); | |
658 | if (audit_buf != NULL) | |
659 | netlbl_unlabel_audit_addr4(audit_buf, | |
660 | dev_name, | |
661 | addr4->s_addr, | |
662 | mask4->s_addr); | |
8cc44579 | 663 | break; |
56628b1d | 664 | } |
8cc44579 | 665 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
56628b1d PE |
666 | case sizeof(struct in6_addr): { |
667 | struct in6_addr *addr6, *mask6; | |
668 | ||
13541b3a PM |
669 | addr6 = (struct in6_addr *)addr; |
670 | mask6 = (struct in6_addr *)mask; | |
671 | ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); | |
672 | if (audit_buf != NULL) | |
673 | netlbl_unlabel_audit_addr6(audit_buf, | |
674 | dev_name, | |
675 | addr6, mask6); | |
8cc44579 | 676 | break; |
56628b1d | 677 | } |
8cc44579 PM |
678 | #endif /* IPv6 */ |
679 | default: | |
680 | ret_val = -EINVAL; | |
681 | } | |
682 | if (ret_val == 0) | |
683 | atomic_inc(&netlabel_mgmt_protocount); | |
684 | ||
685 | unlhsh_add_return: | |
686 | rcu_read_unlock(); | |
13541b3a PM |
687 | if (audit_buf != NULL) { |
688 | if (security_secid_to_secctx(secid, | |
689 | &secctx, | |
690 | &secctx_len) == 0) { | |
691 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
692 | security_release_secctx(secctx, secctx_len); | |
693 | } | |
694 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
695 | audit_log_end(audit_buf); | |
696 | } | |
8cc44579 PM |
697 | return ret_val; |
698 | } | |
699 | ||
700 | /** | |
701 | * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry | |
13541b3a | 702 | * @net: network namespace |
8cc44579 PM |
703 | * @iface: interface entry |
704 | * @addr: IP address | |
705 | * @mask: IP address mask | |
13541b3a | 706 | * @audit_info: NetLabel audit information |
8cc44579 PM |
707 | * |
708 | * Description: | |
709 | * Remove an IP address entry from the unlabeled connection hash table. | |
710 | * Returns zero on success, negative values on failure. The caller is | |
711 | * responsible for calling the rcu_read_[un]lock() functions. | |
712 | * | |
713 | */ | |
13541b3a PM |
714 | static int netlbl_unlhsh_remove_addr4(struct net *net, |
715 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 716 | const struct in_addr *addr, |
13541b3a PM |
717 | const struct in_addr *mask, |
718 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
719 | { |
720 | int ret_val = -ENOENT; | |
721 | struct netlbl_unlhsh_addr4 *entry; | |
13541b3a PM |
722 | struct audit_buffer *audit_buf = NULL; |
723 | struct net_device *dev; | |
724 | char *secctx = NULL; | |
725 | u32 secctx_len; | |
8cc44579 PM |
726 | |
727 | spin_lock(&netlbl_unlhsh_lock); | |
728 | entry = netlbl_unlhsh_search_addr4(addr->s_addr, iface); | |
729 | if (entry != NULL && | |
730 | entry->addr == addr->s_addr && entry->mask == mask->s_addr) { | |
731 | entry->valid = 0; | |
732 | list_del_rcu(&entry->list); | |
733 | ret_val = 0; | |
734 | } | |
735 | spin_unlock(&netlbl_unlhsh_lock); | |
736 | ||
13541b3a PM |
737 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
738 | audit_info); | |
739 | if (audit_buf != NULL) { | |
740 | dev = dev_get_by_index(net, iface->ifindex); | |
741 | netlbl_unlabel_audit_addr4(audit_buf, | |
742 | (dev != NULL ? dev->name : NULL), | |
743 | entry->addr, entry->mask); | |
744 | if (dev != NULL) | |
745 | dev_put(dev); | |
746 | if (security_secid_to_secctx(entry->secid, | |
747 | &secctx, | |
748 | &secctx_len) == 0) { | |
749 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
750 | security_release_secctx(secctx, secctx_len); | |
751 | } | |
752 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
753 | audit_log_end(audit_buf); | |
754 | } | |
755 | ||
8cc44579 PM |
756 | if (ret_val == 0) |
757 | call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4); | |
758 | return ret_val; | |
759 | } | |
760 | ||
761 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
762 | /** | |
763 | * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry | |
13541b3a | 764 | * @net: network namespace |
8cc44579 PM |
765 | * @iface: interface entry |
766 | * @addr: IP address | |
767 | * @mask: IP address mask | |
13541b3a | 768 | * @audit_info: NetLabel audit information |
8cc44579 PM |
769 | * |
770 | * Description: | |
771 | * Remove an IP address entry from the unlabeled connection hash table. | |
772 | * Returns zero on success, negative values on failure. The caller is | |
773 | * responsible for calling the rcu_read_[un]lock() functions. | |
774 | * | |
775 | */ | |
13541b3a PM |
776 | static int netlbl_unlhsh_remove_addr6(struct net *net, |
777 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 778 | const struct in6_addr *addr, |
13541b3a PM |
779 | const struct in6_addr *mask, |
780 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
781 | { |
782 | int ret_val = -ENOENT; | |
783 | struct netlbl_unlhsh_addr6 *entry; | |
13541b3a PM |
784 | struct audit_buffer *audit_buf = NULL; |
785 | struct net_device *dev; | |
786 | char *secctx = NULL; | |
787 | u32 secctx_len; | |
8cc44579 PM |
788 | |
789 | spin_lock(&netlbl_unlhsh_lock); | |
790 | entry = netlbl_unlhsh_search_addr6(addr, iface); | |
791 | if (entry != NULL && | |
792 | (ipv6_addr_equal(&entry->addr, addr) && | |
793 | ipv6_addr_equal(&entry->mask, mask))) { | |
794 | entry->valid = 0; | |
795 | list_del_rcu(&entry->list); | |
796 | ret_val = 0; | |
797 | } | |
798 | spin_unlock(&netlbl_unlhsh_lock); | |
799 | ||
13541b3a PM |
800 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
801 | audit_info); | |
802 | if (audit_buf != NULL) { | |
803 | dev = dev_get_by_index(net, iface->ifindex); | |
804 | netlbl_unlabel_audit_addr6(audit_buf, | |
805 | (dev != NULL ? dev->name : NULL), | |
806 | addr, mask); | |
807 | if (dev != NULL) | |
808 | dev_put(dev); | |
809 | if (security_secid_to_secctx(entry->secid, | |
810 | &secctx, | |
811 | &secctx_len) == 0) { | |
812 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
813 | security_release_secctx(secctx, secctx_len); | |
814 | } | |
815 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
816 | audit_log_end(audit_buf); | |
817 | } | |
818 | ||
8cc44579 PM |
819 | if (ret_val == 0) |
820 | call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6); | |
821 | return ret_val; | |
822 | } | |
823 | #endif /* IPv6 */ | |
824 | ||
825 | /** | |
826 | * netlbl_unlhsh_condremove_iface - Remove an interface entry | |
827 | * @iface: the interface entry | |
828 | * | |
829 | * Description: | |
830 | * Remove an interface entry from the unlabeled connection hash table if it is | |
831 | * empty. An interface entry is considered to be empty if there are no | |
832 | * address entries assigned to it. | |
833 | * | |
834 | */ | |
835 | static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) | |
836 | { | |
837 | struct netlbl_unlhsh_addr4 *iter4; | |
838 | struct netlbl_unlhsh_addr6 *iter6; | |
839 | ||
840 | spin_lock(&netlbl_unlhsh_lock); | |
841 | list_for_each_entry_rcu(iter4, &iface->addr4_list, list) | |
842 | if (iter4->valid) | |
843 | goto unlhsh_condremove_failure; | |
844 | list_for_each_entry_rcu(iter6, &iface->addr6_list, list) | |
845 | if (iter6->valid) | |
846 | goto unlhsh_condremove_failure; | |
847 | iface->valid = 0; | |
848 | if (iface->ifindex > 0) | |
849 | list_del_rcu(&iface->list); | |
850 | else | |
851 | rcu_assign_pointer(netlbl_unlhsh_def, NULL); | |
852 | spin_unlock(&netlbl_unlhsh_lock); | |
853 | ||
854 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
855 | return; | |
856 | ||
857 | unlhsh_condremove_failure: | |
858 | spin_unlock(&netlbl_unlhsh_lock); | |
859 | return; | |
860 | } | |
861 | ||
862 | /** | |
863 | * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table | |
864 | * @net: network namespace | |
865 | * @dev_name: interface name | |
866 | * @addr: IP address in network byte order | |
867 | * @mask: address mask in network byte order | |
868 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
13541b3a | 869 | * @audit_info: NetLabel audit information |
8cc44579 PM |
870 | * |
871 | * Description: | |
872 | * Removes and existing entry from the unlabeled connection hash table. | |
873 | * Returns zero on success, negative values on failure. | |
874 | * | |
875 | */ | |
876 | static int netlbl_unlhsh_remove(struct net *net, | |
877 | const char *dev_name, | |
878 | const void *addr, | |
879 | const void *mask, | |
13541b3a PM |
880 | u32 addr_len, |
881 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
882 | { |
883 | int ret_val; | |
884 | struct net_device *dev; | |
885 | struct netlbl_unlhsh_iface *iface; | |
886 | ||
887 | if (addr_len != sizeof(struct in_addr) && | |
888 | addr_len != sizeof(struct in6_addr)) | |
889 | return -EINVAL; | |
890 | ||
891 | rcu_read_lock(); | |
892 | if (dev_name != NULL) { | |
893 | dev = dev_get_by_name(net, dev_name); | |
894 | if (dev == NULL) { | |
895 | ret_val = -ENODEV; | |
896 | goto unlhsh_remove_return; | |
897 | } | |
898 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
899 | dev_put(dev); | |
900 | } else | |
901 | iface = rcu_dereference(netlbl_unlhsh_def); | |
902 | if (iface == NULL) { | |
903 | ret_val = -ENOENT; | |
904 | goto unlhsh_remove_return; | |
905 | } | |
906 | switch (addr_len) { | |
907 | case sizeof(struct in_addr): | |
13541b3a PM |
908 | ret_val = netlbl_unlhsh_remove_addr4(net, |
909 | iface, addr, mask, | |
910 | audit_info); | |
8cc44579 PM |
911 | break; |
912 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
913 | case sizeof(struct in6_addr): | |
13541b3a PM |
914 | ret_val = netlbl_unlhsh_remove_addr6(net, |
915 | iface, addr, mask, | |
916 | audit_info); | |
8cc44579 PM |
917 | break; |
918 | #endif /* IPv6 */ | |
919 | default: | |
920 | ret_val = -EINVAL; | |
921 | } | |
922 | if (ret_val == 0) { | |
923 | netlbl_unlhsh_condremove_iface(iface); | |
924 | atomic_dec(&netlabel_mgmt_protocount); | |
925 | } | |
926 | ||
927 | unlhsh_remove_return: | |
928 | rcu_read_unlock(); | |
929 | return ret_val; | |
930 | } | |
931 | ||
932 | /* | |
933 | * General Helper Functions | |
934 | */ | |
935 | ||
936 | /** | |
937 | * netlbl_unlhsh_netdev_handler - Network device notification handler | |
938 | * @this: notifier block | |
939 | * @event: the event | |
940 | * @ptr: the network device (cast to void) | |
941 | * | |
942 | * Description: | |
943 | * Handle network device events, although at present all we care about is a | |
944 | * network device going away. In the case of a device going away we clear any | |
945 | * related entries from the unlabeled connection hash table. | |
946 | * | |
947 | */ | |
948 | static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, | |
949 | unsigned long event, | |
950 | void *ptr) | |
951 | { | |
952 | struct net_device *dev = ptr; | |
953 | struct netlbl_unlhsh_iface *iface = NULL; | |
954 | ||
955 | if (dev->nd_net != &init_net) | |
956 | return NOTIFY_DONE; | |
957 | ||
958 | /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ | |
959 | if (event == NETDEV_DOWN) { | |
960 | spin_lock(&netlbl_unlhsh_lock); | |
961 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
962 | if (iface != NULL && iface->valid) { | |
963 | iface->valid = 0; | |
964 | list_del_rcu(&iface->list); | |
965 | } else | |
966 | iface = NULL; | |
967 | spin_unlock(&netlbl_unlhsh_lock); | |
968 | } | |
969 | ||
970 | if (iface != NULL) | |
971 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
972 | ||
973 | return NOTIFY_DONE; | |
974 | } | |
32f50cde PM |
975 | |
976 | /** | |
977 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
978 | * @value: desired value | |
95d4e6be | 979 | * @audit_info: NetLabel audit information |
32f50cde PM |
980 | * |
981 | * Description: | |
982 | * Set the value of the unlabeled accept flag to @value. | |
983 | * | |
984 | */ | |
95d4e6be PM |
985 | static void netlbl_unlabel_acceptflg_set(u8 value, |
986 | struct netlbl_audit *audit_info) | |
32f50cde | 987 | { |
95d4e6be PM |
988 | struct audit_buffer *audit_buf; |
989 | u8 old_val; | |
990 | ||
4be2700f | 991 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 992 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
993 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
994 | audit_info); | |
de64688f PM |
995 | if (audit_buf != NULL) { |
996 | audit_log_format(audit_buf, | |
997 | " unlbl_accept=%u old=%u", value, old_val); | |
998 | audit_log_end(audit_buf); | |
999 | } | |
32f50cde PM |
1000 | } |
1001 | ||
8cc44579 PM |
1002 | /** |
1003 | * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information | |
1004 | * @info: the Generic NETLINK info block | |
1005 | * @addr: the IP address | |
1006 | * @mask: the IP address mask | |
1007 | * @len: the address length | |
1008 | * | |
1009 | * Description: | |
1010 | * Examine the Generic NETLINK message and extract the IP address information. | |
1011 | * Returns zero on success, negative values on failure. | |
1012 | * | |
1013 | */ | |
1014 | static int netlbl_unlabel_addrinfo_get(struct genl_info *info, | |
1015 | void **addr, | |
1016 | void **mask, | |
1017 | u32 *len) | |
1018 | { | |
1019 | u32 addr_len; | |
1020 | ||
1021 | if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) { | |
1022 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
1023 | if (addr_len != sizeof(struct in_addr) && | |
1024 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) | |
1025 | return -EINVAL; | |
1026 | *len = addr_len; | |
1027 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
1028 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); | |
1029 | return 0; | |
1030 | } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { | |
1031 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
1032 | if (addr_len != sizeof(struct in6_addr) && | |
1033 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) | |
1034 | return -EINVAL; | |
1035 | *len = addr_len; | |
1036 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
1037 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); | |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | return -EINVAL; | |
1042 | } | |
1043 | ||
96cb8e33 PM |
1044 | /* |
1045 | * NetLabel Command Handlers | |
1046 | */ | |
1047 | ||
1048 | /** | |
1049 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
1050 | * @skb: the NETLINK buffer | |
1051 | * @info: the Generic NETLINK info block | |
1052 | * | |
1053 | * Description: | |
1054 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
1055 | * Returns zero on success, negative values on failure. | |
1056 | * | |
1057 | */ | |
1058 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
1059 | { | |
fd385855 | 1060 | u8 value; |
95d4e6be | 1061 | struct netlbl_audit audit_info; |
96cb8e33 | 1062 | |
fd385855 PM |
1063 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
1064 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 1065 | if (value == 1 || value == 0) { |
95d4e6be PM |
1066 | netlbl_netlink_auditinfo(skb, &audit_info); |
1067 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 1068 | return 0; |
96cb8e33 PM |
1069 | } |
1070 | } | |
1071 | ||
32f50cde | 1072 | return -EINVAL; |
96cb8e33 PM |
1073 | } |
1074 | ||
1075 | /** | |
1076 | * netlbl_unlabel_list - Handle a LIST message | |
1077 | * @skb: the NETLINK buffer | |
1078 | * @info: the Generic NETLINK info block | |
1079 | * | |
1080 | * Description: | |
1081 | * Process a user generated LIST message and respond with the current status. | |
1082 | * Returns zero on success, negative values on failure. | |
1083 | * | |
1084 | */ | |
1085 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
1086 | { | |
fd385855 | 1087 | int ret_val = -EINVAL; |
96cb8e33 | 1088 | struct sk_buff *ans_skb; |
fd385855 | 1089 | void *data; |
96cb8e33 | 1090 | |
339bf98f | 1091 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
1092 | if (ans_skb == NULL) |
1093 | goto list_failure; | |
17c157c8 TG |
1094 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
1095 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
1096 | if (data == NULL) { |
1097 | ret_val = -ENOMEM; | |
96cb8e33 | 1098 | goto list_failure; |
fd385855 | 1099 | } |
96cb8e33 | 1100 | |
fd385855 PM |
1101 | ret_val = nla_put_u8(ans_skb, |
1102 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 1103 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
1104 | if (ret_val != 0) |
1105 | goto list_failure; | |
1106 | ||
fd385855 PM |
1107 | genlmsg_end(ans_skb, data); |
1108 | ||
81878d27 | 1109 | ret_val = genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
1110 | if (ret_val != 0) |
1111 | goto list_failure; | |
96cb8e33 PM |
1112 | return 0; |
1113 | ||
1114 | list_failure: | |
b08d5840 | 1115 | kfree_skb(ans_skb); |
96cb8e33 PM |
1116 | return ret_val; |
1117 | } | |
1118 | ||
8cc44579 PM |
1119 | /** |
1120 | * netlbl_unlabel_staticadd - Handle a STATICADD message | |
1121 | * @skb: the NETLINK buffer | |
1122 | * @info: the Generic NETLINK info block | |
1123 | * | |
1124 | * Description: | |
1125 | * Process a user generated STATICADD message and add a new unlabeled | |
1126 | * connection entry to the hash table. Returns zero on success, negative | |
1127 | * values on failure. | |
1128 | * | |
1129 | */ | |
1130 | static int netlbl_unlabel_staticadd(struct sk_buff *skb, | |
1131 | struct genl_info *info) | |
1132 | { | |
1133 | int ret_val; | |
1134 | char *dev_name; | |
1135 | void *addr; | |
1136 | void *mask; | |
1137 | u32 addr_len; | |
1138 | u32 secid; | |
13541b3a | 1139 | struct netlbl_audit audit_info; |
8cc44579 PM |
1140 | |
1141 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
1142 | * single entry. However, allow users to create two entries, one each | |
1143 | * for IPv4 and IPv4, with the same LSM security context which should | |
1144 | * achieve the same result. */ | |
1145 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
1146 | !info->attrs[NLBL_UNLABEL_A_IFACE] || | |
1147 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1148 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1149 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1150 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1151 | return -EINVAL; | |
1152 | ||
13541b3a PM |
1153 | netlbl_netlink_auditinfo(skb, &audit_info); |
1154 | ||
8cc44579 PM |
1155 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1156 | if (ret_val != 0) | |
1157 | return ret_val; | |
1158 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1159 | ret_val = security_secctx_to_secid( | |
1160 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1161 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1162 | &secid); | |
1163 | if (ret_val != 0) | |
1164 | return ret_val; | |
1165 | ||
1166 | return netlbl_unlhsh_add(&init_net, | |
13541b3a PM |
1167 | dev_name, addr, mask, addr_len, secid, |
1168 | &audit_info); | |
8cc44579 PM |
1169 | } |
1170 | ||
1171 | /** | |
1172 | * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message | |
1173 | * @skb: the NETLINK buffer | |
1174 | * @info: the Generic NETLINK info block | |
1175 | * | |
1176 | * Description: | |
1177 | * Process a user generated STATICADDDEF message and add a new default | |
1178 | * unlabeled connection entry. Returns zero on success, negative values on | |
1179 | * failure. | |
1180 | * | |
1181 | */ | |
1182 | static int netlbl_unlabel_staticadddef(struct sk_buff *skb, | |
1183 | struct genl_info *info) | |
1184 | { | |
1185 | int ret_val; | |
1186 | void *addr; | |
1187 | void *mask; | |
1188 | u32 addr_len; | |
1189 | u32 secid; | |
13541b3a | 1190 | struct netlbl_audit audit_info; |
8cc44579 PM |
1191 | |
1192 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
1193 | * single entry. However, allow users to create two entries, one each | |
1194 | * for IPv4 and IPv6, with the same LSM security context which should | |
1195 | * achieve the same result. */ | |
1196 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
1197 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1198 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1199 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1200 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1201 | return -EINVAL; | |
1202 | ||
13541b3a PM |
1203 | netlbl_netlink_auditinfo(skb, &audit_info); |
1204 | ||
8cc44579 PM |
1205 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1206 | if (ret_val != 0) | |
1207 | return ret_val; | |
1208 | ret_val = security_secctx_to_secid( | |
1209 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1210 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1211 | &secid); | |
1212 | if (ret_val != 0) | |
1213 | return ret_val; | |
1214 | ||
13541b3a PM |
1215 | return netlbl_unlhsh_add(&init_net, |
1216 | NULL, addr, mask, addr_len, secid, | |
1217 | &audit_info); | |
8cc44579 PM |
1218 | } |
1219 | ||
1220 | /** | |
1221 | * netlbl_unlabel_staticremove - Handle a STATICREMOVE message | |
1222 | * @skb: the NETLINK buffer | |
1223 | * @info: the Generic NETLINK info block | |
1224 | * | |
1225 | * Description: | |
1226 | * Process a user generated STATICREMOVE message and remove the specified | |
1227 | * unlabeled connection entry. Returns zero on success, negative values on | |
1228 | * failure. | |
1229 | * | |
1230 | */ | |
1231 | static int netlbl_unlabel_staticremove(struct sk_buff *skb, | |
1232 | struct genl_info *info) | |
1233 | { | |
1234 | int ret_val; | |
1235 | char *dev_name; | |
1236 | void *addr; | |
1237 | void *mask; | |
1238 | u32 addr_len; | |
13541b3a | 1239 | struct netlbl_audit audit_info; |
8cc44579 PM |
1240 | |
1241 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1242 | * IPv4 and IPv6 in the same entry. */ | |
1243 | if (!info->attrs[NLBL_UNLABEL_A_IFACE] || | |
1244 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1245 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1246 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1247 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1248 | return -EINVAL; | |
1249 | ||
13541b3a PM |
1250 | netlbl_netlink_auditinfo(skb, &audit_info); |
1251 | ||
8cc44579 PM |
1252 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1253 | if (ret_val != 0) | |
1254 | return ret_val; | |
1255 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1256 | ||
13541b3a PM |
1257 | return netlbl_unlhsh_remove(&init_net, |
1258 | dev_name, addr, mask, addr_len, | |
1259 | &audit_info); | |
8cc44579 PM |
1260 | } |
1261 | ||
1262 | /** | |
1263 | * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message | |
1264 | * @skb: the NETLINK buffer | |
1265 | * @info: the Generic NETLINK info block | |
1266 | * | |
1267 | * Description: | |
1268 | * Process a user generated STATICREMOVEDEF message and remove the default | |
1269 | * unlabeled connection entry. Returns zero on success, negative values on | |
1270 | * failure. | |
1271 | * | |
1272 | */ | |
1273 | static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, | |
1274 | struct genl_info *info) | |
1275 | { | |
1276 | int ret_val; | |
1277 | void *addr; | |
1278 | void *mask; | |
1279 | u32 addr_len; | |
13541b3a | 1280 | struct netlbl_audit audit_info; |
8cc44579 PM |
1281 | |
1282 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1283 | * IPv4 and IPv6 in the same entry. */ | |
1284 | if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1285 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1286 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1287 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1288 | return -EINVAL; | |
1289 | ||
13541b3a PM |
1290 | netlbl_netlink_auditinfo(skb, &audit_info); |
1291 | ||
8cc44579 PM |
1292 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1293 | if (ret_val != 0) | |
1294 | return ret_val; | |
1295 | ||
13541b3a PM |
1296 | return netlbl_unlhsh_remove(&init_net, |
1297 | NULL, addr, mask, addr_len, | |
1298 | &audit_info); | |
8cc44579 PM |
1299 | } |
1300 | ||
1301 | ||
1302 | /** | |
1303 | * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] | |
1304 | * @cmd: command/message | |
1305 | * @iface: the interface entry | |
1306 | * @addr4: the IPv4 address entry | |
1307 | * @addr6: the IPv6 address entry | |
1308 | * @arg: the netlbl_unlhsh_walk_arg structure | |
1309 | * | |
1310 | * Description: | |
1311 | * This function is designed to be used to generate a response for a | |
1312 | * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 | |
1313 | * can be specified, not both, the other unspecified entry should be set to | |
1314 | * NULL by the caller. Returns the size of the message on success, negative | |
1315 | * values on failure. | |
1316 | * | |
1317 | */ | |
1318 | static int netlbl_unlabel_staticlist_gen(u32 cmd, | |
1319 | const struct netlbl_unlhsh_iface *iface, | |
1320 | const struct netlbl_unlhsh_addr4 *addr4, | |
1321 | const struct netlbl_unlhsh_addr6 *addr6, | |
1322 | void *arg) | |
1323 | { | |
1324 | int ret_val = -ENOMEM; | |
1325 | struct netlbl_unlhsh_walk_arg *cb_arg = arg; | |
1326 | struct net_device *dev; | |
1327 | void *data; | |
1328 | u32 secid; | |
1329 | char *secctx; | |
1330 | u32 secctx_len; | |
1331 | ||
1332 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid, | |
1333 | cb_arg->seq, &netlbl_unlabel_gnl_family, | |
1334 | NLM_F_MULTI, cmd); | |
1335 | if (data == NULL) | |
1336 | goto list_cb_failure; | |
1337 | ||
1338 | if (iface->ifindex > 0) { | |
1339 | dev = dev_get_by_index(&init_net, iface->ifindex); | |
1340 | ret_val = nla_put_string(cb_arg->skb, | |
1341 | NLBL_UNLABEL_A_IFACE, dev->name); | |
1342 | dev_put(dev); | |
1343 | if (ret_val != 0) | |
1344 | goto list_cb_failure; | |
1345 | } | |
1346 | ||
1347 | if (addr4) { | |
1348 | struct in_addr addr_struct; | |
1349 | ||
1350 | addr_struct.s_addr = addr4->addr; | |
1351 | ret_val = nla_put(cb_arg->skb, | |
1352 | NLBL_UNLABEL_A_IPV4ADDR, | |
1353 | sizeof(struct in_addr), | |
1354 | &addr_struct); | |
1355 | if (ret_val != 0) | |
1356 | goto list_cb_failure; | |
1357 | ||
1358 | addr_struct.s_addr = addr4->mask; | |
1359 | ret_val = nla_put(cb_arg->skb, | |
1360 | NLBL_UNLABEL_A_IPV4MASK, | |
1361 | sizeof(struct in_addr), | |
1362 | &addr_struct); | |
1363 | if (ret_val != 0) | |
1364 | goto list_cb_failure; | |
1365 | ||
1366 | secid = addr4->secid; | |
1367 | } else { | |
1368 | ret_val = nla_put(cb_arg->skb, | |
1369 | NLBL_UNLABEL_A_IPV6ADDR, | |
1370 | sizeof(struct in6_addr), | |
1371 | &addr6->addr); | |
1372 | if (ret_val != 0) | |
1373 | goto list_cb_failure; | |
1374 | ||
1375 | ret_val = nla_put(cb_arg->skb, | |
1376 | NLBL_UNLABEL_A_IPV6MASK, | |
1377 | sizeof(struct in6_addr), | |
1378 | &addr6->mask); | |
1379 | if (ret_val != 0) | |
1380 | goto list_cb_failure; | |
1381 | ||
1382 | secid = addr6->secid; | |
1383 | } | |
1384 | ||
1385 | ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); | |
1386 | if (ret_val != 0) | |
1387 | goto list_cb_failure; | |
1388 | ret_val = nla_put(cb_arg->skb, | |
1389 | NLBL_UNLABEL_A_SECCTX, | |
1390 | secctx_len, | |
1391 | secctx); | |
1392 | security_release_secctx(secctx, secctx_len); | |
1393 | if (ret_val != 0) | |
1394 | goto list_cb_failure; | |
1395 | ||
1396 | cb_arg->seq++; | |
1397 | return genlmsg_end(cb_arg->skb, data); | |
1398 | ||
1399 | list_cb_failure: | |
1400 | genlmsg_cancel(cb_arg->skb, data); | |
1401 | return ret_val; | |
1402 | } | |
1403 | ||
1404 | /** | |
1405 | * netlbl_unlabel_staticlist - Handle a STATICLIST message | |
1406 | * @skb: the NETLINK buffer | |
1407 | * @cb: the NETLINK callback | |
1408 | * | |
1409 | * Description: | |
1410 | * Process a user generated STATICLIST message and dump the unlabeled | |
1411 | * connection hash table in a form suitable for use in a kernel generated | |
1412 | * STATICLIST message. Returns the length of @skb. | |
1413 | * | |
1414 | */ | |
1415 | static int netlbl_unlabel_staticlist(struct sk_buff *skb, | |
1416 | struct netlink_callback *cb) | |
1417 | { | |
1418 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1419 | u32 skip_bkt = cb->args[0]; | |
1420 | u32 skip_chain = cb->args[1]; | |
1421 | u32 skip_addr4 = cb->args[2]; | |
1422 | u32 skip_addr6 = cb->args[3]; | |
1423 | u32 iter_bkt; | |
1424 | u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; | |
1425 | struct netlbl_unlhsh_iface *iface; | |
1426 | struct netlbl_unlhsh_addr4 *addr4; | |
1427 | struct netlbl_unlhsh_addr6 *addr6; | |
1428 | ||
1429 | cb_arg.nl_cb = cb; | |
1430 | cb_arg.skb = skb; | |
1431 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1432 | ||
1433 | rcu_read_lock(); | |
1434 | for (iter_bkt = skip_bkt; | |
1435 | iter_bkt < rcu_dereference(netlbl_unlhsh)->size; | |
1436 | iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) { | |
1437 | list_for_each_entry_rcu(iface, | |
1438 | &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt], | |
1439 | list) { | |
1440 | if (!iface->valid || | |
1441 | iter_chain++ < skip_chain) | |
1442 | continue; | |
1443 | list_for_each_entry_rcu(addr4, | |
1444 | &iface->addr4_list, | |
1445 | list) { | |
1446 | if (!addr4->valid || iter_addr4++ < skip_addr4) | |
1447 | continue; | |
1448 | if (netlbl_unlabel_staticlist_gen( | |
1449 | NLBL_UNLABEL_C_STATICLIST, | |
1450 | iface, | |
1451 | addr4, | |
1452 | NULL, | |
1453 | &cb_arg) < 0) { | |
1454 | iter_addr4--; | |
1455 | iter_chain--; | |
1456 | goto unlabel_staticlist_return; | |
1457 | } | |
1458 | } | |
1459 | list_for_each_entry_rcu(addr6, | |
1460 | &iface->addr6_list, | |
1461 | list) { | |
1462 | if (!addr6->valid || iter_addr6++ < skip_addr6) | |
1463 | continue; | |
1464 | if (netlbl_unlabel_staticlist_gen( | |
1465 | NLBL_UNLABEL_C_STATICLIST, | |
1466 | iface, | |
1467 | NULL, | |
1468 | addr6, | |
1469 | &cb_arg) < 0) { | |
1470 | iter_addr6--; | |
1471 | iter_chain--; | |
1472 | goto unlabel_staticlist_return; | |
1473 | } | |
1474 | } | |
1475 | } | |
1476 | } | |
1477 | ||
1478 | unlabel_staticlist_return: | |
1479 | rcu_read_unlock(); | |
1480 | cb->args[0] = skip_bkt; | |
1481 | cb->args[1] = skip_chain; | |
1482 | cb->args[2] = skip_addr4; | |
1483 | cb->args[3] = skip_addr6; | |
1484 | return skb->len; | |
1485 | } | |
1486 | ||
1487 | /** | |
1488 | * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message | |
1489 | * @skb: the NETLINK buffer | |
1490 | * @cb: the NETLINK callback | |
1491 | * | |
1492 | * Description: | |
1493 | * Process a user generated STATICLISTDEF message and dump the default | |
1494 | * unlabeled connection entry in a form suitable for use in a kernel generated | |
1495 | * STATICLISTDEF message. Returns the length of @skb. | |
1496 | * | |
1497 | */ | |
1498 | static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, | |
1499 | struct netlink_callback *cb) | |
1500 | { | |
1501 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1502 | struct netlbl_unlhsh_iface *iface; | |
1503 | u32 skip_addr4 = cb->args[0]; | |
1504 | u32 skip_addr6 = cb->args[1]; | |
1505 | u32 iter_addr4 = 0, iter_addr6 = 0; | |
1506 | struct netlbl_unlhsh_addr4 *addr4; | |
1507 | struct netlbl_unlhsh_addr6 *addr6; | |
1508 | ||
1509 | cb_arg.nl_cb = cb; | |
1510 | cb_arg.skb = skb; | |
1511 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1512 | ||
1513 | rcu_read_lock(); | |
1514 | iface = rcu_dereference(netlbl_unlhsh_def); | |
1515 | if (iface == NULL || !iface->valid) | |
1516 | goto unlabel_staticlistdef_return; | |
1517 | ||
1518 | list_for_each_entry_rcu(addr4, &iface->addr4_list, list) { | |
1519 | if (!addr4->valid || iter_addr4++ < skip_addr4) | |
1520 | continue; | |
1521 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
1522 | iface, | |
1523 | addr4, | |
1524 | NULL, | |
1525 | &cb_arg) < 0) { | |
1526 | iter_addr4--; | |
1527 | goto unlabel_staticlistdef_return; | |
1528 | } | |
1529 | } | |
1530 | list_for_each_entry_rcu(addr6, &iface->addr6_list, list) { | |
1531 | if (addr6->valid || iter_addr6++ < skip_addr6) | |
1532 | continue; | |
1533 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
1534 | iface, | |
1535 | NULL, | |
1536 | addr6, | |
1537 | &cb_arg) < 0) { | |
1538 | iter_addr6--; | |
1539 | goto unlabel_staticlistdef_return; | |
1540 | } | |
1541 | } | |
1542 | ||
1543 | unlabel_staticlistdef_return: | |
1544 | rcu_read_unlock(); | |
1545 | cb->args[0] = skip_addr4; | |
1546 | cb->args[1] = skip_addr6; | |
1547 | return skb->len; | |
1548 | } | |
96cb8e33 PM |
1549 | |
1550 | /* | |
1551 | * NetLabel Generic NETLINK Command Definitions | |
1552 | */ | |
1553 | ||
8cc44579 PM |
1554 | static struct genl_ops netlbl_unlabel_genl_c_staticadd = { |
1555 | .cmd = NLBL_UNLABEL_C_STATICADD, | |
1556 | .flags = GENL_ADMIN_PERM, | |
1557 | .policy = netlbl_unlabel_genl_policy, | |
1558 | .doit = netlbl_unlabel_staticadd, | |
1559 | .dumpit = NULL, | |
1560 | }; | |
1561 | ||
1562 | static struct genl_ops netlbl_unlabel_genl_c_staticremove = { | |
1563 | .cmd = NLBL_UNLABEL_C_STATICREMOVE, | |
1564 | .flags = GENL_ADMIN_PERM, | |
1565 | .policy = netlbl_unlabel_genl_policy, | |
1566 | .doit = netlbl_unlabel_staticremove, | |
1567 | .dumpit = NULL, | |
1568 | }; | |
1569 | ||
1570 | static struct genl_ops netlbl_unlabel_genl_c_staticlist = { | |
1571 | .cmd = NLBL_UNLABEL_C_STATICLIST, | |
1572 | .flags = 0, | |
1573 | .policy = netlbl_unlabel_genl_policy, | |
1574 | .doit = NULL, | |
1575 | .dumpit = netlbl_unlabel_staticlist, | |
1576 | }; | |
1577 | ||
1578 | static struct genl_ops netlbl_unlabel_genl_c_staticadddef = { | |
1579 | .cmd = NLBL_UNLABEL_C_STATICADDDEF, | |
1580 | .flags = GENL_ADMIN_PERM, | |
1581 | .policy = netlbl_unlabel_genl_policy, | |
1582 | .doit = netlbl_unlabel_staticadddef, | |
1583 | .dumpit = NULL, | |
1584 | }; | |
1585 | ||
1586 | static struct genl_ops netlbl_unlabel_genl_c_staticremovedef = { | |
1587 | .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, | |
1588 | .flags = GENL_ADMIN_PERM, | |
1589 | .policy = netlbl_unlabel_genl_policy, | |
1590 | .doit = netlbl_unlabel_staticremovedef, | |
1591 | .dumpit = NULL, | |
1592 | }; | |
1593 | ||
1594 | static struct genl_ops netlbl_unlabel_genl_c_staticlistdef = { | |
1595 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, | |
1596 | .flags = 0, | |
1597 | .policy = netlbl_unlabel_genl_policy, | |
1598 | .doit = NULL, | |
1599 | .dumpit = netlbl_unlabel_staticlistdef, | |
1600 | }; | |
1601 | ||
96cb8e33 PM |
1602 | static struct genl_ops netlbl_unlabel_genl_c_accept = { |
1603 | .cmd = NLBL_UNLABEL_C_ACCEPT, | |
fd385855 PM |
1604 | .flags = GENL_ADMIN_PERM, |
1605 | .policy = netlbl_unlabel_genl_policy, | |
96cb8e33 PM |
1606 | .doit = netlbl_unlabel_accept, |
1607 | .dumpit = NULL, | |
1608 | }; | |
1609 | ||
1610 | static struct genl_ops netlbl_unlabel_genl_c_list = { | |
1611 | .cmd = NLBL_UNLABEL_C_LIST, | |
1612 | .flags = 0, | |
fd385855 | 1613 | .policy = netlbl_unlabel_genl_policy, |
96cb8e33 PM |
1614 | .doit = netlbl_unlabel_list, |
1615 | .dumpit = NULL, | |
1616 | }; | |
1617 | ||
96cb8e33 PM |
1618 | /* |
1619 | * NetLabel Generic NETLINK Protocol Functions | |
1620 | */ | |
1621 | ||
1622 | /** | |
1623 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
1624 | * | |
1625 | * Description: | |
1626 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
1627 | * mechanism. Returns zero on success, negative values on failure. | |
1628 | * | |
1629 | */ | |
1630 | int netlbl_unlabel_genl_init(void) | |
1631 | { | |
1632 | int ret_val; | |
1633 | ||
1634 | ret_val = genl_register_family(&netlbl_unlabel_gnl_family); | |
1635 | if (ret_val != 0) | |
1636 | return ret_val; | |
1637 | ||
8cc44579 PM |
1638 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, |
1639 | &netlbl_unlabel_genl_c_staticadd); | |
1640 | if (ret_val != 0) | |
1641 | return ret_val; | |
1642 | ||
1643 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, | |
1644 | &netlbl_unlabel_genl_c_staticremove); | |
1645 | if (ret_val != 0) | |
1646 | return ret_val; | |
1647 | ||
1648 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, | |
1649 | &netlbl_unlabel_genl_c_staticlist); | |
1650 | if (ret_val != 0) | |
1651 | return ret_val; | |
1652 | ||
1653 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, | |
1654 | &netlbl_unlabel_genl_c_staticadddef); | |
1655 | if (ret_val != 0) | |
1656 | return ret_val; | |
1657 | ||
1658 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, | |
1659 | &netlbl_unlabel_genl_c_staticremovedef); | |
1660 | if (ret_val != 0) | |
1661 | return ret_val; | |
1662 | ||
1663 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, | |
1664 | &netlbl_unlabel_genl_c_staticlistdef); | |
1665 | if (ret_val != 0) | |
1666 | return ret_val; | |
1667 | ||
96cb8e33 PM |
1668 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, |
1669 | &netlbl_unlabel_genl_c_accept); | |
1670 | if (ret_val != 0) | |
1671 | return ret_val; | |
1672 | ||
1673 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, | |
1674 | &netlbl_unlabel_genl_c_list); | |
1675 | if (ret_val != 0) | |
1676 | return ret_val; | |
1677 | ||
1678 | return 0; | |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | * NetLabel KAPI Hooks | |
1683 | */ | |
1684 | ||
8cc44579 PM |
1685 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1686 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1687 | }; | |
1688 | ||
1689 | /** | |
1690 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1691 | * @size: the number of bits to use for the hash buckets | |
1692 | * | |
1693 | * Description: | |
1694 | * Initializes the unlabeled connection hash table and registers a network | |
1695 | * device notification handler. This function should only be called by the | |
1696 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1697 | * non-zero values on error. | |
1698 | * | |
1699 | */ | |
1700 | int netlbl_unlabel_init(u32 size) | |
1701 | { | |
1702 | u32 iter; | |
1703 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1704 | ||
1705 | if (size == 0) | |
1706 | return -EINVAL; | |
1707 | ||
1708 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1709 | if (hsh_tbl == NULL) | |
1710 | return -ENOMEM; | |
1711 | hsh_tbl->size = 1 << size; | |
1712 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1713 | sizeof(struct list_head), | |
1714 | GFP_KERNEL); | |
1715 | if (hsh_tbl->tbl == NULL) { | |
1716 | kfree(hsh_tbl); | |
1717 | return -ENOMEM; | |
1718 | } | |
1719 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1720 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1721 | ||
1722 | rcu_read_lock(); | |
1723 | spin_lock(&netlbl_unlhsh_lock); | |
1724 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); | |
1725 | spin_unlock(&netlbl_unlhsh_lock); | |
1726 | rcu_read_unlock(); | |
1727 | ||
1728 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1729 | ||
1730 | return 0; | |
1731 | } | |
1732 | ||
96cb8e33 PM |
1733 | /** |
1734 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1735 | * @skb: the packet |
1736 | * @family: protocol family | |
96cb8e33 PM |
1737 | * @secattr: the security attributes |
1738 | * | |
1739 | * Description: | |
1740 | * Determine the security attributes, if any, for an unlabled packet and return | |
1741 | * them in @secattr. Returns zero on success and negative values on failure. | |
1742 | * | |
1743 | */ | |
8cc44579 PM |
1744 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1745 | u16 family, | |
1746 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1747 | { |
8cc44579 PM |
1748 | struct netlbl_unlhsh_iface *iface; |
1749 | ||
1750 | rcu_read_lock(); | |
1751 | iface = netlbl_unlhsh_search_iface_def(skb->iif); | |
1752 | if (iface == NULL) | |
1753 | goto unlabel_getattr_nolabel; | |
1754 | switch (family) { | |
56628b1d PE |
1755 | case PF_INET: { |
1756 | struct iphdr *hdr4; | |
1757 | struct netlbl_unlhsh_addr4 *addr4; | |
1758 | ||
8cc44579 PM |
1759 | hdr4 = ip_hdr(skb); |
1760 | addr4 = netlbl_unlhsh_search_addr4(hdr4->saddr, iface); | |
1761 | if (addr4 == NULL) | |
1762 | goto unlabel_getattr_nolabel; | |
1763 | secattr->attr.secid = addr4->secid; | |
1764 | break; | |
56628b1d | 1765 | } |
8cc44579 | 1766 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
56628b1d PE |
1767 | case PF_INET6: { |
1768 | struct ipv6hdr *hdr6; | |
1769 | struct netlbl_unlhsh_addr6 *addr6; | |
1770 | ||
8cc44579 PM |
1771 | hdr6 = ipv6_hdr(skb); |
1772 | addr6 = netlbl_unlhsh_search_addr6(&hdr6->saddr, iface); | |
1773 | if (addr6 == NULL) | |
1774 | goto unlabel_getattr_nolabel; | |
1775 | secattr->attr.secid = addr6->secid; | |
1776 | break; | |
56628b1d | 1777 | } |
8cc44579 PM |
1778 | #endif /* IPv6 */ |
1779 | default: | |
1780 | goto unlabel_getattr_nolabel; | |
1781 | } | |
1782 | rcu_read_unlock(); | |
1783 | ||
1784 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1785 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1786 | return 0; | |
1787 | ||
1788 | unlabel_getattr_nolabel: | |
1789 | rcu_read_unlock(); | |
c783f1ce PM |
1790 | if (netlabel_unlabel_acceptflg == 0) |
1791 | return -ENOMSG; | |
16efd454 | 1792 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1793 | return 0; |
96cb8e33 PM |
1794 | } |
1795 | ||
1796 | /** | |
1797 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1798 | * | |
1799 | * Description: | |
1800 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1801 | * and to send unlabeled network traffic by default. | |
1802 | * | |
1803 | */ | |
1804 | int netlbl_unlabel_defconf(void) | |
1805 | { | |
1806 | int ret_val; | |
1807 | struct netlbl_dom_map *entry; | |
95d4e6be | 1808 | struct netlbl_audit audit_info; |
32f50cde | 1809 | |
95d4e6be PM |
1810 | /* Only the kernel is allowed to call this function and the only time |
1811 | * it is called is at bootup before the audit subsystem is reporting | |
1812 | * messages so don't worry to much about these values. */ | |
1813 | security_task_getsecid(current, &audit_info.secid); | |
1814 | audit_info.loginuid = 0; | |
96cb8e33 PM |
1815 | |
1816 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1817 | if (entry == NULL) | |
1818 | return -ENOMEM; | |
1819 | entry->type = NETLBL_NLTYPE_UNLABELED; | |
95d4e6be | 1820 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1821 | if (ret_val != 0) |
1822 | return ret_val; | |
1823 | ||
95d4e6be | 1824 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1825 | |
1826 | return 0; | |
1827 | } |