Commit | Line | Data |
---|---|---|
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 | * | |
82c21bfa | 8 | * Author: Paul Moore <paul@paul-moore.com> |
96cb8e33 PM |
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 | |
d484ff15 | 26 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
96cb8e33 PM |
27 | * |
28 | */ | |
29 | ||
30 | #include <linux/types.h> | |
8cc44579 | 31 | #include <linux/rcupdate.h> |
96cb8e33 PM |
32 | #include <linux/list.h> |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/string.h> | |
36 | #include <linux/skbuff.h> | |
de64688f | 37 | #include <linux/audit.h> |
8cc44579 PM |
38 | #include <linux/in.h> |
39 | #include <linux/in6.h> | |
40 | #include <linux/ip.h> | |
41 | #include <linux/ipv6.h> | |
42 | #include <linux/notifier.h> | |
43 | #include <linux/netdevice.h> | |
44 | #include <linux/security.h> | |
5a0e3ad6 | 45 | #include <linux/slab.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> | |
60063497 | 54 | #include <linux/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); | |
b914f3a2 | 117 | #define netlbl_unlhsh_rcu_deref(p) \ |
d8bf4ca9 | 118 | rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock)) |
8cc44579 PM |
119 | static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL; |
120 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL; | |
96cb8e33 PM |
121 | |
122 | /* Accept unlabeled packets flag */ | |
cd28786d | 123 | static u8 netlabel_unlabel_acceptflg = 0; |
96cb8e33 | 124 | |
8cc44579 | 125 | /* NetLabel Generic NETLINK unlabeled family */ |
96cb8e33 PM |
126 | static struct genl_family netlbl_unlabel_gnl_family = { |
127 | .id = GENL_ID_GENERATE, | |
128 | .hdrsize = 0, | |
129 | .name = NETLBL_NLTYPE_UNLABELED_NAME, | |
130 | .version = NETLBL_PROTO_VERSION, | |
fd385855 | 131 | .maxattr = NLBL_UNLABEL_A_MAX, |
96cb8e33 PM |
132 | }; |
133 | ||
fd385855 | 134 | /* NetLabel Netlink attribute policy */ |
ef7c79ed | 135 | static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
fd385855 | 136 | [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
8cc44579 PM |
137 | [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY, |
138 | .len = sizeof(struct in6_addr) }, | |
139 | [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY, | |
140 | .len = sizeof(struct in6_addr) }, | |
141 | [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY, | |
142 | .len = sizeof(struct in_addr) }, | |
143 | [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY, | |
144 | .len = sizeof(struct in_addr) }, | |
145 | [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING, | |
146 | .len = IFNAMSIZ - 1 }, | |
147 | [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY } | |
fd385855 | 148 | }; |
96cb8e33 | 149 | |
32f50cde | 150 | /* |
8cc44579 PM |
151 | * Unlabeled Connection Hash Table Functions |
152 | */ | |
153 | ||
8cc44579 PM |
154 | /** |
155 | * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table | |
156 | * @entry: the entry's RCU field | |
157 | * | |
158 | * Description: | |
159 | * This function is designed to be used as a callback to the call_rcu() | |
160 | * function so that memory allocated to a hash table interface entry can be | |
161 | * released safely. It is important to note that this function does not free | |
162 | * the IPv4 and IPv6 address lists contained as part of an interface entry. It | |
163 | * is up to the rest of the code to make sure an interface entry is only freed | |
164 | * once it's address lists are empty. | |
165 | * | |
166 | */ | |
167 | static void netlbl_unlhsh_free_iface(struct rcu_head *entry) | |
168 | { | |
169 | struct netlbl_unlhsh_iface *iface; | |
61e10682 PM |
170 | struct netlbl_af4list *iter4; |
171 | struct netlbl_af4list *tmp4; | |
dfd56b8b | 172 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
173 | struct netlbl_af6list *iter6; |
174 | struct netlbl_af6list *tmp6; | |
175 | #endif /* IPv6 */ | |
8cc44579 PM |
176 | |
177 | iface = container_of(entry, struct netlbl_unlhsh_iface, rcu); | |
178 | ||
179 | /* no need for locks here since we are the only one with access to this | |
180 | * structure */ | |
181 | ||
61e10682 PM |
182 | netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) { |
183 | netlbl_af4list_remove_entry(iter4); | |
184 | kfree(netlbl_unlhsh_addr4_entry(iter4)); | |
185 | } | |
dfd56b8b | 186 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
187 | netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) { |
188 | netlbl_af6list_remove_entry(iter6); | |
189 | kfree(netlbl_unlhsh_addr6_entry(iter6)); | |
190 | } | |
191 | #endif /* IPv6 */ | |
8cc44579 PM |
192 | kfree(iface); |
193 | } | |
194 | ||
195 | /** | |
196 | * netlbl_unlhsh_hash - Hashing function for the hash table | |
197 | * @ifindex: the network interface/device to hash | |
198 | * | |
199 | * Description: | |
200 | * This is the hashing function for the unlabeled hash table, it returns the | |
201 | * bucket number for the given device/interface. The caller is responsible for | |
b914f3a2 PM |
202 | * ensuring that the hash table is protected with either a RCU read lock or |
203 | * the hash table lock. | |
8cc44579 PM |
204 | * |
205 | */ | |
206 | static u32 netlbl_unlhsh_hash(int ifindex) | |
207 | { | |
b914f3a2 | 208 | return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1); |
8cc44579 PM |
209 | } |
210 | ||
8cc44579 PM |
211 | /** |
212 | * netlbl_unlhsh_search_iface - Search for a matching interface entry | |
213 | * @ifindex: the network interface | |
214 | * | |
215 | * Description: | |
216 | * Searches the unlabeled connection hash table and returns a pointer to the | |
217 | * interface entry which matches @ifindex, otherwise NULL is returned. The | |
b914f3a2 PM |
218 | * caller is responsible for ensuring that the hash table is protected with |
219 | * either a RCU read lock or the hash table lock. | |
8cc44579 PM |
220 | * |
221 | */ | |
222 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex) | |
223 | { | |
224 | u32 bkt; | |
56196701 | 225 | struct list_head *bkt_list; |
8cc44579 PM |
226 | struct netlbl_unlhsh_iface *iter; |
227 | ||
228 | bkt = netlbl_unlhsh_hash(ifindex); | |
b914f3a2 | 229 | bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]; |
56196701 | 230 | list_for_each_entry_rcu(iter, bkt_list, list) |
8cc44579 PM |
231 | if (iter->valid && iter->ifindex == ifindex) |
232 | return iter; | |
233 | ||
234 | return NULL; | |
235 | } | |
236 | ||
8cc44579 PM |
237 | /** |
238 | * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table | |
239 | * @iface: the associated interface entry | |
240 | * @addr: IPv4 address in network byte order | |
241 | * @mask: IPv4 address mask in network byte order | |
242 | * @secid: LSM secid value for entry | |
243 | * | |
244 | * Description: | |
245 | * Add a new address entry into the unlabeled connection hash table using the | |
246 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 247 | * a negative value is returned. |
8cc44579 | 248 | * |
32f50cde | 249 | */ |
8cc44579 PM |
250 | static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, |
251 | const struct in_addr *addr, | |
252 | const struct in_addr *mask, | |
253 | u32 secid) | |
254 | { | |
61e10682 | 255 | int ret_val; |
8cc44579 | 256 | struct netlbl_unlhsh_addr4 *entry; |
8cc44579 PM |
257 | |
258 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
259 | if (entry == NULL) | |
260 | return -ENOMEM; | |
261 | ||
61e10682 PM |
262 | entry->list.addr = addr->s_addr & mask->s_addr; |
263 | entry->list.mask = mask->s_addr; | |
264 | entry->list.valid = 1; | |
61e10682 | 265 | entry->secid = secid; |
8cc44579 PM |
266 | |
267 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 268 | ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); |
8cc44579 | 269 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
270 | |
271 | if (ret_val != 0) | |
272 | kfree(entry); | |
273 | return ret_val; | |
8cc44579 PM |
274 | } |
275 | ||
dfd56b8b | 276 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 PM |
277 | /** |
278 | * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table | |
279 | * @iface: the associated interface entry | |
280 | * @addr: IPv6 address in network byte order | |
281 | * @mask: IPv6 address mask in network byte order | |
282 | * @secid: LSM secid value for entry | |
283 | * | |
284 | * Description: | |
285 | * Add a new address entry into the unlabeled connection hash table using the | |
286 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 287 | * a negative value is returned. |
8cc44579 PM |
288 | * |
289 | */ | |
290 | static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, | |
291 | const struct in6_addr *addr, | |
292 | const struct in6_addr *mask, | |
293 | u32 secid) | |
294 | { | |
61e10682 | 295 | int ret_val; |
8cc44579 | 296 | struct netlbl_unlhsh_addr6 *entry; |
8cc44579 PM |
297 | |
298 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
299 | if (entry == NULL) | |
300 | return -ENOMEM; | |
301 | ||
4e3fd7a0 | 302 | entry->list.addr = *addr; |
61e10682 PM |
303 | entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; |
304 | entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; | |
305 | entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; | |
306 | entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; | |
4e3fd7a0 | 307 | entry->list.mask = *mask; |
61e10682 | 308 | entry->list.valid = 1; |
61e10682 | 309 | entry->secid = secid; |
8cc44579 PM |
310 | |
311 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 312 | ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); |
8cc44579 | 313 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
314 | |
315 | if (ret_val != 0) | |
316 | kfree(entry); | |
8cc44579 PM |
317 | return 0; |
318 | } | |
319 | #endif /* IPv6 */ | |
320 | ||
321 | /** | |
322 | * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table | |
323 | * @ifindex: network interface | |
324 | * | |
325 | * Description: | |
326 | * Add a new, empty, interface entry into the unlabeled connection hash table. | |
327 | * On success a pointer to the new interface entry is returned, on failure NULL | |
b914f3a2 | 328 | * is returned. |
8cc44579 PM |
329 | * |
330 | */ | |
331 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) | |
332 | { | |
333 | u32 bkt; | |
334 | struct netlbl_unlhsh_iface *iface; | |
335 | ||
336 | iface = kzalloc(sizeof(*iface), GFP_ATOMIC); | |
337 | if (iface == NULL) | |
338 | return NULL; | |
339 | ||
340 | iface->ifindex = ifindex; | |
341 | INIT_LIST_HEAD(&iface->addr4_list); | |
342 | INIT_LIST_HEAD(&iface->addr6_list); | |
343 | iface->valid = 1; | |
8cc44579 PM |
344 | |
345 | spin_lock(&netlbl_unlhsh_lock); | |
346 | if (ifindex > 0) { | |
347 | bkt = netlbl_unlhsh_hash(ifindex); | |
348 | if (netlbl_unlhsh_search_iface(ifindex) != NULL) | |
349 | goto add_iface_failure; | |
350 | list_add_tail_rcu(&iface->list, | |
b914f3a2 | 351 | &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]); |
8cc44579 PM |
352 | } else { |
353 | INIT_LIST_HEAD(&iface->list); | |
b914f3a2 | 354 | if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL) |
8cc44579 | 355 | goto add_iface_failure; |
cf778b00 | 356 | rcu_assign_pointer(netlbl_unlhsh_def, iface); |
8cc44579 PM |
357 | } |
358 | spin_unlock(&netlbl_unlhsh_lock); | |
359 | ||
360 | return iface; | |
361 | ||
362 | add_iface_failure: | |
363 | spin_unlock(&netlbl_unlhsh_lock); | |
364 | kfree(iface); | |
365 | return NULL; | |
366 | } | |
367 | ||
368 | /** | |
369 | * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table | |
370 | * @net: network namespace | |
371 | * @dev_name: interface name | |
372 | * @addr: IP address in network byte order | |
373 | * @mask: address mask in network byte order | |
374 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
375 | * @secid: LSM secid value for the entry | |
13541b3a | 376 | * @audit_info: NetLabel audit information |
8cc44579 PM |
377 | * |
378 | * Description: | |
379 | * Adds a new entry to the unlabeled connection hash table. Returns zero on | |
380 | * success, negative values on failure. | |
381 | * | |
382 | */ | |
6c2e8ac0 PM |
383 | int netlbl_unlhsh_add(struct net *net, |
384 | const char *dev_name, | |
385 | const void *addr, | |
386 | const void *mask, | |
387 | u32 addr_len, | |
388 | u32 secid, | |
389 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
390 | { |
391 | int ret_val; | |
392 | int ifindex; | |
393 | struct net_device *dev; | |
394 | struct netlbl_unlhsh_iface *iface; | |
13541b3a PM |
395 | struct audit_buffer *audit_buf = NULL; |
396 | char *secctx = NULL; | |
397 | u32 secctx_len; | |
8cc44579 PM |
398 | |
399 | if (addr_len != sizeof(struct in_addr) && | |
400 | addr_len != sizeof(struct in6_addr)) | |
401 | return -EINVAL; | |
402 | ||
403 | rcu_read_lock(); | |
404 | if (dev_name != NULL) { | |
122ec6ff | 405 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
406 | if (dev == NULL) { |
407 | ret_val = -ENODEV; | |
408 | goto unlhsh_add_return; | |
409 | } | |
410 | ifindex = dev->ifindex; | |
8cc44579 PM |
411 | iface = netlbl_unlhsh_search_iface(ifindex); |
412 | } else { | |
413 | ifindex = 0; | |
414 | iface = rcu_dereference(netlbl_unlhsh_def); | |
415 | } | |
416 | if (iface == NULL) { | |
417 | iface = netlbl_unlhsh_add_iface(ifindex); | |
418 | if (iface == NULL) { | |
419 | ret_val = -ENOMEM; | |
420 | goto unlhsh_add_return; | |
421 | } | |
422 | } | |
13541b3a PM |
423 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, |
424 | audit_info); | |
8cc44579 | 425 | switch (addr_len) { |
56628b1d | 426 | case sizeof(struct in_addr): { |
ea110733 JP |
427 | const struct in_addr *addr4 = addr; |
428 | const struct in_addr *mask4 = mask; | |
56628b1d | 429 | |
13541b3a PM |
430 | ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); |
431 | if (audit_buf != NULL) | |
63c41688 PM |
432 | netlbl_af4list_audit_addr(audit_buf, 1, |
433 | dev_name, | |
434 | addr4->s_addr, | |
435 | mask4->s_addr); | |
8cc44579 | 436 | break; |
56628b1d | 437 | } |
dfd56b8b | 438 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d | 439 | case sizeof(struct in6_addr): { |
ea110733 JP |
440 | const struct in6_addr *addr6 = addr; |
441 | const struct in6_addr *mask6 = mask; | |
56628b1d | 442 | |
13541b3a PM |
443 | ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); |
444 | if (audit_buf != NULL) | |
63c41688 PM |
445 | netlbl_af6list_audit_addr(audit_buf, 1, |
446 | dev_name, | |
447 | addr6, mask6); | |
8cc44579 | 448 | break; |
56628b1d | 449 | } |
8cc44579 PM |
450 | #endif /* IPv6 */ |
451 | default: | |
452 | ret_val = -EINVAL; | |
453 | } | |
454 | if (ret_val == 0) | |
455 | atomic_inc(&netlabel_mgmt_protocount); | |
456 | ||
457 | unlhsh_add_return: | |
458 | rcu_read_unlock(); | |
13541b3a PM |
459 | if (audit_buf != NULL) { |
460 | if (security_secid_to_secctx(secid, | |
461 | &secctx, | |
462 | &secctx_len) == 0) { | |
463 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
464 | security_release_secctx(secctx, secctx_len); | |
465 | } | |
466 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
467 | audit_log_end(audit_buf); | |
468 | } | |
8cc44579 PM |
469 | return ret_val; |
470 | } | |
471 | ||
472 | /** | |
473 | * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry | |
13541b3a | 474 | * @net: network namespace |
8cc44579 PM |
475 | * @iface: interface entry |
476 | * @addr: IP address | |
477 | * @mask: IP address mask | |
13541b3a | 478 | * @audit_info: NetLabel audit information |
8cc44579 PM |
479 | * |
480 | * Description: | |
481 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 482 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
483 | * |
484 | */ | |
13541b3a PM |
485 | static int netlbl_unlhsh_remove_addr4(struct net *net, |
486 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 487 | const struct in_addr *addr, |
13541b3a PM |
488 | const struct in_addr *mask, |
489 | struct netlbl_audit *audit_info) | |
8cc44579 | 490 | { |
61e10682 | 491 | struct netlbl_af4list *list_entry; |
8cc44579 | 492 | struct netlbl_unlhsh_addr4 *entry; |
61e10682 | 493 | struct audit_buffer *audit_buf; |
13541b3a | 494 | struct net_device *dev; |
61e10682 | 495 | char *secctx; |
13541b3a | 496 | u32 secctx_len; |
8cc44579 PM |
497 | |
498 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
499 | list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, |
500 | &iface->addr4_list); | |
8cc44579 | 501 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
502 | if (list_entry != NULL) |
503 | entry = netlbl_unlhsh_addr4_entry(list_entry); | |
504 | else | |
ec8f2375 | 505 | entry = NULL; |
8cc44579 | 506 | |
13541b3a PM |
507 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
508 | audit_info); | |
509 | if (audit_buf != NULL) { | |
510 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
511 | netlbl_af4list_audit_addr(audit_buf, 1, |
512 | (dev != NULL ? dev->name : NULL), | |
513 | addr->s_addr, mask->s_addr); | |
13541b3a PM |
514 | if (dev != NULL) |
515 | dev_put(dev); | |
ec8f2375 PM |
516 | if (entry != NULL && |
517 | security_secid_to_secctx(entry->secid, | |
518 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
519 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
520 | security_release_secctx(secctx, secctx_len); | |
521 | } | |
ec8f2375 | 522 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
523 | audit_log_end(audit_buf); |
524 | } | |
525 | ||
ec8f2375 PM |
526 | if (entry == NULL) |
527 | return -ENOENT; | |
528 | ||
c3b49420 | 529 | kfree_rcu(entry, rcu); |
ec8f2375 | 530 | return 0; |
8cc44579 PM |
531 | } |
532 | ||
dfd56b8b | 533 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 PM |
534 | /** |
535 | * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry | |
13541b3a | 536 | * @net: network namespace |
8cc44579 PM |
537 | * @iface: interface entry |
538 | * @addr: IP address | |
539 | * @mask: IP address mask | |
13541b3a | 540 | * @audit_info: NetLabel audit information |
8cc44579 PM |
541 | * |
542 | * Description: | |
543 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 544 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
545 | * |
546 | */ | |
13541b3a PM |
547 | static int netlbl_unlhsh_remove_addr6(struct net *net, |
548 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 549 | const struct in6_addr *addr, |
13541b3a PM |
550 | const struct in6_addr *mask, |
551 | struct netlbl_audit *audit_info) | |
8cc44579 | 552 | { |
61e10682 | 553 | struct netlbl_af6list *list_entry; |
8cc44579 | 554 | struct netlbl_unlhsh_addr6 *entry; |
61e10682 | 555 | struct audit_buffer *audit_buf; |
13541b3a | 556 | struct net_device *dev; |
61e10682 | 557 | char *secctx; |
13541b3a | 558 | u32 secctx_len; |
8cc44579 PM |
559 | |
560 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 561 | list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); |
8cc44579 | 562 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
563 | if (list_entry != NULL) |
564 | entry = netlbl_unlhsh_addr6_entry(list_entry); | |
565 | else | |
ec8f2375 | 566 | entry = NULL; |
8cc44579 | 567 | |
13541b3a PM |
568 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
569 | audit_info); | |
570 | if (audit_buf != NULL) { | |
571 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
572 | netlbl_af6list_audit_addr(audit_buf, 1, |
573 | (dev != NULL ? dev->name : NULL), | |
574 | addr, mask); | |
13541b3a PM |
575 | if (dev != NULL) |
576 | dev_put(dev); | |
ec8f2375 PM |
577 | if (entry != NULL && |
578 | security_secid_to_secctx(entry->secid, | |
579 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
580 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
581 | security_release_secctx(secctx, secctx_len); | |
582 | } | |
ec8f2375 | 583 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
584 | audit_log_end(audit_buf); |
585 | } | |
586 | ||
ec8f2375 PM |
587 | if (entry == NULL) |
588 | return -ENOENT; | |
589 | ||
6b262232 | 590 | kfree_rcu(entry, rcu); |
ec8f2375 | 591 | return 0; |
8cc44579 PM |
592 | } |
593 | #endif /* IPv6 */ | |
594 | ||
595 | /** | |
596 | * netlbl_unlhsh_condremove_iface - Remove an interface entry | |
597 | * @iface: the interface entry | |
598 | * | |
599 | * Description: | |
600 | * Remove an interface entry from the unlabeled connection hash table if it is | |
601 | * empty. An interface entry is considered to be empty if there are no | |
602 | * address entries assigned to it. | |
603 | * | |
604 | */ | |
605 | static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) | |
606 | { | |
61e10682 | 607 | struct netlbl_af4list *iter4; |
dfd56b8b | 608 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
609 | struct netlbl_af6list *iter6; |
610 | #endif /* IPv6 */ | |
8cc44579 PM |
611 | |
612 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
613 | netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list) |
614 | goto unlhsh_condremove_failure; | |
dfd56b8b | 615 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
616 | netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list) |
617 | goto unlhsh_condremove_failure; | |
618 | #endif /* IPv6 */ | |
8cc44579 PM |
619 | iface->valid = 0; |
620 | if (iface->ifindex > 0) | |
621 | list_del_rcu(&iface->list); | |
622 | else | |
a9b3cd7f | 623 | RCU_INIT_POINTER(netlbl_unlhsh_def, NULL); |
8cc44579 PM |
624 | spin_unlock(&netlbl_unlhsh_lock); |
625 | ||
626 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
627 | return; | |
628 | ||
629 | unlhsh_condremove_failure: | |
630 | spin_unlock(&netlbl_unlhsh_lock); | |
8cc44579 PM |
631 | } |
632 | ||
633 | /** | |
634 | * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table | |
635 | * @net: network namespace | |
636 | * @dev_name: interface name | |
637 | * @addr: IP address in network byte order | |
638 | * @mask: address mask in network byte order | |
639 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
13541b3a | 640 | * @audit_info: NetLabel audit information |
8cc44579 PM |
641 | * |
642 | * Description: | |
643 | * Removes and existing entry from the unlabeled connection hash table. | |
644 | * Returns zero on success, negative values on failure. | |
645 | * | |
646 | */ | |
6c2e8ac0 PM |
647 | int netlbl_unlhsh_remove(struct net *net, |
648 | const char *dev_name, | |
649 | const void *addr, | |
650 | const void *mask, | |
651 | u32 addr_len, | |
652 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
653 | { |
654 | int ret_val; | |
655 | struct net_device *dev; | |
656 | struct netlbl_unlhsh_iface *iface; | |
657 | ||
658 | if (addr_len != sizeof(struct in_addr) && | |
659 | addr_len != sizeof(struct in6_addr)) | |
660 | return -EINVAL; | |
661 | ||
662 | rcu_read_lock(); | |
663 | if (dev_name != NULL) { | |
122ec6ff | 664 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
665 | if (dev == NULL) { |
666 | ret_val = -ENODEV; | |
667 | goto unlhsh_remove_return; | |
668 | } | |
669 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
8cc44579 PM |
670 | } else |
671 | iface = rcu_dereference(netlbl_unlhsh_def); | |
672 | if (iface == NULL) { | |
673 | ret_val = -ENOENT; | |
674 | goto unlhsh_remove_return; | |
675 | } | |
676 | switch (addr_len) { | |
677 | case sizeof(struct in_addr): | |
13541b3a PM |
678 | ret_val = netlbl_unlhsh_remove_addr4(net, |
679 | iface, addr, mask, | |
680 | audit_info); | |
8cc44579 | 681 | break; |
dfd56b8b | 682 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 | 683 | case sizeof(struct in6_addr): |
13541b3a PM |
684 | ret_val = netlbl_unlhsh_remove_addr6(net, |
685 | iface, addr, mask, | |
686 | audit_info); | |
8cc44579 PM |
687 | break; |
688 | #endif /* IPv6 */ | |
689 | default: | |
690 | ret_val = -EINVAL; | |
691 | } | |
692 | if (ret_val == 0) { | |
693 | netlbl_unlhsh_condremove_iface(iface); | |
694 | atomic_dec(&netlabel_mgmt_protocount); | |
695 | } | |
696 | ||
697 | unlhsh_remove_return: | |
698 | rcu_read_unlock(); | |
699 | return ret_val; | |
700 | } | |
701 | ||
702 | /* | |
703 | * General Helper Functions | |
704 | */ | |
705 | ||
706 | /** | |
707 | * netlbl_unlhsh_netdev_handler - Network device notification handler | |
708 | * @this: notifier block | |
709 | * @event: the event | |
351638e7 | 710 | * @ptr: the netdevice notifier info (cast to void) |
8cc44579 PM |
711 | * |
712 | * Description: | |
713 | * Handle network device events, although at present all we care about is a | |
714 | * network device going away. In the case of a device going away we clear any | |
715 | * related entries from the unlabeled connection hash table. | |
716 | * | |
717 | */ | |
718 | static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, | |
351638e7 | 719 | unsigned long event, void *ptr) |
8cc44579 | 720 | { |
351638e7 | 721 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
8cc44579 PM |
722 | struct netlbl_unlhsh_iface *iface = NULL; |
723 | ||
721499e8 | 724 | if (!net_eq(dev_net(dev), &init_net)) |
8cc44579 PM |
725 | return NOTIFY_DONE; |
726 | ||
727 | /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ | |
728 | if (event == NETDEV_DOWN) { | |
729 | spin_lock(&netlbl_unlhsh_lock); | |
730 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
731 | if (iface != NULL && iface->valid) { | |
732 | iface->valid = 0; | |
733 | list_del_rcu(&iface->list); | |
734 | } else | |
735 | iface = NULL; | |
736 | spin_unlock(&netlbl_unlhsh_lock); | |
737 | } | |
738 | ||
739 | if (iface != NULL) | |
740 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
741 | ||
742 | return NOTIFY_DONE; | |
743 | } | |
32f50cde PM |
744 | |
745 | /** | |
746 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
747 | * @value: desired value | |
95d4e6be | 748 | * @audit_info: NetLabel audit information |
32f50cde PM |
749 | * |
750 | * Description: | |
751 | * Set the value of the unlabeled accept flag to @value. | |
752 | * | |
753 | */ | |
95d4e6be PM |
754 | static void netlbl_unlabel_acceptflg_set(u8 value, |
755 | struct netlbl_audit *audit_info) | |
32f50cde | 756 | { |
95d4e6be PM |
757 | struct audit_buffer *audit_buf; |
758 | u8 old_val; | |
759 | ||
4be2700f | 760 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 761 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
762 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
763 | audit_info); | |
de64688f PM |
764 | if (audit_buf != NULL) { |
765 | audit_log_format(audit_buf, | |
766 | " unlbl_accept=%u old=%u", value, old_val); | |
767 | audit_log_end(audit_buf); | |
768 | } | |
32f50cde PM |
769 | } |
770 | ||
8cc44579 PM |
771 | /** |
772 | * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information | |
773 | * @info: the Generic NETLINK info block | |
774 | * @addr: the IP address | |
775 | * @mask: the IP address mask | |
776 | * @len: the address length | |
777 | * | |
778 | * Description: | |
779 | * Examine the Generic NETLINK message and extract the IP address information. | |
780 | * Returns zero on success, negative values on failure. | |
781 | * | |
782 | */ | |
783 | static int netlbl_unlabel_addrinfo_get(struct genl_info *info, | |
784 | void **addr, | |
785 | void **mask, | |
786 | u32 *len) | |
787 | { | |
788 | u32 addr_len; | |
789 | ||
790 | if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) { | |
791 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
792 | if (addr_len != sizeof(struct in_addr) && | |
793 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) | |
794 | return -EINVAL; | |
795 | *len = addr_len; | |
796 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
797 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); | |
798 | return 0; | |
799 | } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { | |
800 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
801 | if (addr_len != sizeof(struct in6_addr) && | |
802 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) | |
803 | return -EINVAL; | |
804 | *len = addr_len; | |
805 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
806 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); | |
807 | return 0; | |
808 | } | |
809 | ||
810 | return -EINVAL; | |
811 | } | |
812 | ||
96cb8e33 PM |
813 | /* |
814 | * NetLabel Command Handlers | |
815 | */ | |
816 | ||
817 | /** | |
818 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
819 | * @skb: the NETLINK buffer | |
820 | * @info: the Generic NETLINK info block | |
821 | * | |
822 | * Description: | |
823 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
824 | * Returns zero on success, negative values on failure. | |
825 | * | |
826 | */ | |
827 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
828 | { | |
fd385855 | 829 | u8 value; |
95d4e6be | 830 | struct netlbl_audit audit_info; |
96cb8e33 | 831 | |
fd385855 PM |
832 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
833 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 834 | if (value == 1 || value == 0) { |
95d4e6be PM |
835 | netlbl_netlink_auditinfo(skb, &audit_info); |
836 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 837 | return 0; |
96cb8e33 PM |
838 | } |
839 | } | |
840 | ||
32f50cde | 841 | return -EINVAL; |
96cb8e33 PM |
842 | } |
843 | ||
844 | /** | |
845 | * netlbl_unlabel_list - Handle a LIST message | |
846 | * @skb: the NETLINK buffer | |
847 | * @info: the Generic NETLINK info block | |
848 | * | |
849 | * Description: | |
850 | * Process a user generated LIST message and respond with the current status. | |
851 | * Returns zero on success, negative values on failure. | |
852 | * | |
853 | */ | |
854 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
855 | { | |
fd385855 | 856 | int ret_val = -EINVAL; |
96cb8e33 | 857 | struct sk_buff *ans_skb; |
fd385855 | 858 | void *data; |
96cb8e33 | 859 | |
339bf98f | 860 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
861 | if (ans_skb == NULL) |
862 | goto list_failure; | |
17c157c8 TG |
863 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
864 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
865 | if (data == NULL) { |
866 | ret_val = -ENOMEM; | |
96cb8e33 | 867 | goto list_failure; |
fd385855 | 868 | } |
96cb8e33 | 869 | |
fd385855 PM |
870 | ret_val = nla_put_u8(ans_skb, |
871 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 872 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
873 | if (ret_val != 0) |
874 | goto list_failure; | |
875 | ||
fd385855 | 876 | genlmsg_end(ans_skb, data); |
fe785bee | 877 | return genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
878 | |
879 | list_failure: | |
b08d5840 | 880 | kfree_skb(ans_skb); |
96cb8e33 PM |
881 | return ret_val; |
882 | } | |
883 | ||
8cc44579 PM |
884 | /** |
885 | * netlbl_unlabel_staticadd - Handle a STATICADD message | |
886 | * @skb: the NETLINK buffer | |
887 | * @info: the Generic NETLINK info block | |
888 | * | |
889 | * Description: | |
890 | * Process a user generated STATICADD message and add a new unlabeled | |
891 | * connection entry to the hash table. Returns zero on success, negative | |
892 | * values on failure. | |
893 | * | |
894 | */ | |
895 | static int netlbl_unlabel_staticadd(struct sk_buff *skb, | |
896 | struct genl_info *info) | |
897 | { | |
898 | int ret_val; | |
899 | char *dev_name; | |
900 | void *addr; | |
901 | void *mask; | |
902 | u32 addr_len; | |
903 | u32 secid; | |
13541b3a | 904 | struct netlbl_audit audit_info; |
8cc44579 PM |
905 | |
906 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
907 | * single entry. However, allow users to create two entries, one each | |
908 | * for IPv4 and IPv4, with the same LSM security context which should | |
909 | * achieve the same result. */ | |
910 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
911 | !info->attrs[NLBL_UNLABEL_A_IFACE] || | |
912 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
913 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
914 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
915 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
916 | return -EINVAL; | |
917 | ||
13541b3a PM |
918 | netlbl_netlink_auditinfo(skb, &audit_info); |
919 | ||
8cc44579 PM |
920 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
921 | if (ret_val != 0) | |
922 | return ret_val; | |
923 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
924 | ret_val = security_secctx_to_secid( | |
925 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
926 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
927 | &secid); | |
928 | if (ret_val != 0) | |
929 | return ret_val; | |
930 | ||
931 | return netlbl_unlhsh_add(&init_net, | |
13541b3a PM |
932 | dev_name, addr, mask, addr_len, secid, |
933 | &audit_info); | |
8cc44579 PM |
934 | } |
935 | ||
936 | /** | |
937 | * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message | |
938 | * @skb: the NETLINK buffer | |
939 | * @info: the Generic NETLINK info block | |
940 | * | |
941 | * Description: | |
942 | * Process a user generated STATICADDDEF message and add a new default | |
943 | * unlabeled connection entry. Returns zero on success, negative values on | |
944 | * failure. | |
945 | * | |
946 | */ | |
947 | static int netlbl_unlabel_staticadddef(struct sk_buff *skb, | |
948 | struct genl_info *info) | |
949 | { | |
950 | int ret_val; | |
951 | void *addr; | |
952 | void *mask; | |
953 | u32 addr_len; | |
954 | u32 secid; | |
13541b3a | 955 | struct netlbl_audit audit_info; |
8cc44579 PM |
956 | |
957 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
958 | * single entry. However, allow users to create two entries, one each | |
959 | * for IPv4 and IPv6, with the same LSM security context which should | |
960 | * achieve the same result. */ | |
961 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
962 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
963 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
964 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
965 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
966 | return -EINVAL; | |
967 | ||
13541b3a PM |
968 | netlbl_netlink_auditinfo(skb, &audit_info); |
969 | ||
8cc44579 PM |
970 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
971 | if (ret_val != 0) | |
972 | return ret_val; | |
973 | ret_val = security_secctx_to_secid( | |
974 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
975 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
976 | &secid); | |
977 | if (ret_val != 0) | |
978 | return ret_val; | |
979 | ||
13541b3a PM |
980 | return netlbl_unlhsh_add(&init_net, |
981 | NULL, addr, mask, addr_len, secid, | |
982 | &audit_info); | |
8cc44579 PM |
983 | } |
984 | ||
985 | /** | |
986 | * netlbl_unlabel_staticremove - Handle a STATICREMOVE message | |
987 | * @skb: the NETLINK buffer | |
988 | * @info: the Generic NETLINK info block | |
989 | * | |
990 | * Description: | |
991 | * Process a user generated STATICREMOVE message and remove the specified | |
992 | * unlabeled connection entry. Returns zero on success, negative values on | |
993 | * failure. | |
994 | * | |
995 | */ | |
996 | static int netlbl_unlabel_staticremove(struct sk_buff *skb, | |
997 | struct genl_info *info) | |
998 | { | |
999 | int ret_val; | |
1000 | char *dev_name; | |
1001 | void *addr; | |
1002 | void *mask; | |
1003 | u32 addr_len; | |
13541b3a | 1004 | struct netlbl_audit audit_info; |
8cc44579 PM |
1005 | |
1006 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1007 | * IPv4 and IPv6 in the same entry. */ | |
1008 | if (!info->attrs[NLBL_UNLABEL_A_IFACE] || | |
1009 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1010 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1011 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1012 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1013 | return -EINVAL; | |
1014 | ||
13541b3a PM |
1015 | netlbl_netlink_auditinfo(skb, &audit_info); |
1016 | ||
8cc44579 PM |
1017 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1018 | if (ret_val != 0) | |
1019 | return ret_val; | |
1020 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1021 | ||
13541b3a PM |
1022 | return netlbl_unlhsh_remove(&init_net, |
1023 | dev_name, addr, mask, addr_len, | |
1024 | &audit_info); | |
8cc44579 PM |
1025 | } |
1026 | ||
1027 | /** | |
1028 | * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message | |
1029 | * @skb: the NETLINK buffer | |
1030 | * @info: the Generic NETLINK info block | |
1031 | * | |
1032 | * Description: | |
1033 | * Process a user generated STATICREMOVEDEF message and remove the default | |
1034 | * unlabeled connection entry. Returns zero on success, negative values on | |
1035 | * failure. | |
1036 | * | |
1037 | */ | |
1038 | static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, | |
1039 | struct genl_info *info) | |
1040 | { | |
1041 | int ret_val; | |
1042 | void *addr; | |
1043 | void *mask; | |
1044 | u32 addr_len; | |
13541b3a | 1045 | struct netlbl_audit audit_info; |
8cc44579 PM |
1046 | |
1047 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1048 | * IPv4 and IPv6 in the same entry. */ | |
1049 | if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1050 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1051 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1052 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1053 | return -EINVAL; | |
1054 | ||
13541b3a PM |
1055 | netlbl_netlink_auditinfo(skb, &audit_info); |
1056 | ||
8cc44579 PM |
1057 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1058 | if (ret_val != 0) | |
1059 | return ret_val; | |
1060 | ||
13541b3a PM |
1061 | return netlbl_unlhsh_remove(&init_net, |
1062 | NULL, addr, mask, addr_len, | |
1063 | &audit_info); | |
8cc44579 PM |
1064 | } |
1065 | ||
1066 | ||
1067 | /** | |
1068 | * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] | |
1069 | * @cmd: command/message | |
1070 | * @iface: the interface entry | |
1071 | * @addr4: the IPv4 address entry | |
1072 | * @addr6: the IPv6 address entry | |
1073 | * @arg: the netlbl_unlhsh_walk_arg structure | |
1074 | * | |
1075 | * Description: | |
1076 | * This function is designed to be used to generate a response for a | |
1077 | * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 | |
1078 | * can be specified, not both, the other unspecified entry should be set to | |
1079 | * NULL by the caller. Returns the size of the message on success, negative | |
1080 | * values on failure. | |
1081 | * | |
1082 | */ | |
1083 | static int netlbl_unlabel_staticlist_gen(u32 cmd, | |
1084 | const struct netlbl_unlhsh_iface *iface, | |
1085 | const struct netlbl_unlhsh_addr4 *addr4, | |
1086 | const struct netlbl_unlhsh_addr6 *addr6, | |
1087 | void *arg) | |
1088 | { | |
1089 | int ret_val = -ENOMEM; | |
1090 | struct netlbl_unlhsh_walk_arg *cb_arg = arg; | |
1091 | struct net_device *dev; | |
1092 | void *data; | |
1093 | u32 secid; | |
1094 | char *secctx; | |
1095 | u32 secctx_len; | |
1096 | ||
15e47304 | 1097 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, |
8cc44579 PM |
1098 | cb_arg->seq, &netlbl_unlabel_gnl_family, |
1099 | NLM_F_MULTI, cmd); | |
1100 | if (data == NULL) | |
1101 | goto list_cb_failure; | |
1102 | ||
1103 | if (iface->ifindex > 0) { | |
1104 | dev = dev_get_by_index(&init_net, iface->ifindex); | |
794eb6bf JJ |
1105 | if (!dev) { |
1106 | ret_val = -ENODEV; | |
1107 | goto list_cb_failure; | |
1108 | } | |
8cc44579 PM |
1109 | ret_val = nla_put_string(cb_arg->skb, |
1110 | NLBL_UNLABEL_A_IFACE, dev->name); | |
1111 | dev_put(dev); | |
1112 | if (ret_val != 0) | |
1113 | goto list_cb_failure; | |
1114 | } | |
1115 | ||
1116 | if (addr4) { | |
1117 | struct in_addr addr_struct; | |
1118 | ||
61e10682 | 1119 | addr_struct.s_addr = addr4->list.addr; |
930345ea JB |
1120 | ret_val = nla_put_in_addr(cb_arg->skb, |
1121 | NLBL_UNLABEL_A_IPV4ADDR, | |
1122 | addr_struct.s_addr); | |
8cc44579 PM |
1123 | if (ret_val != 0) |
1124 | goto list_cb_failure; | |
1125 | ||
61e10682 | 1126 | addr_struct.s_addr = addr4->list.mask; |
930345ea JB |
1127 | ret_val = nla_put_in_addr(cb_arg->skb, |
1128 | NLBL_UNLABEL_A_IPV4MASK, | |
1129 | addr_struct.s_addr); | |
8cc44579 PM |
1130 | if (ret_val != 0) |
1131 | goto list_cb_failure; | |
1132 | ||
1133 | secid = addr4->secid; | |
1134 | } else { | |
930345ea JB |
1135 | ret_val = nla_put_in6_addr(cb_arg->skb, |
1136 | NLBL_UNLABEL_A_IPV6ADDR, | |
1137 | &addr6->list.addr); | |
8cc44579 PM |
1138 | if (ret_val != 0) |
1139 | goto list_cb_failure; | |
1140 | ||
930345ea JB |
1141 | ret_val = nla_put_in6_addr(cb_arg->skb, |
1142 | NLBL_UNLABEL_A_IPV6MASK, | |
1143 | &addr6->list.mask); | |
8cc44579 PM |
1144 | if (ret_val != 0) |
1145 | goto list_cb_failure; | |
1146 | ||
1147 | secid = addr6->secid; | |
1148 | } | |
1149 | ||
1150 | ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); | |
1151 | if (ret_val != 0) | |
1152 | goto list_cb_failure; | |
1153 | ret_val = nla_put(cb_arg->skb, | |
1154 | NLBL_UNLABEL_A_SECCTX, | |
1155 | secctx_len, | |
1156 | secctx); | |
1157 | security_release_secctx(secctx, secctx_len); | |
1158 | if (ret_val != 0) | |
1159 | goto list_cb_failure; | |
1160 | ||
1161 | cb_arg->seq++; | |
053c095a JB |
1162 | genlmsg_end(cb_arg->skb, data); |
1163 | return 0; | |
8cc44579 PM |
1164 | |
1165 | list_cb_failure: | |
1166 | genlmsg_cancel(cb_arg->skb, data); | |
1167 | return ret_val; | |
1168 | } | |
1169 | ||
1170 | /** | |
1171 | * netlbl_unlabel_staticlist - Handle a STATICLIST message | |
1172 | * @skb: the NETLINK buffer | |
1173 | * @cb: the NETLINK callback | |
1174 | * | |
1175 | * Description: | |
1176 | * Process a user generated STATICLIST message and dump the unlabeled | |
1177 | * connection hash table in a form suitable for use in a kernel generated | |
1178 | * STATICLIST message. Returns the length of @skb. | |
1179 | * | |
1180 | */ | |
1181 | static int netlbl_unlabel_staticlist(struct sk_buff *skb, | |
1182 | struct netlink_callback *cb) | |
1183 | { | |
1184 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1185 | u32 skip_bkt = cb->args[0]; | |
1186 | u32 skip_chain = cb->args[1]; | |
8cc44579 PM |
1187 | u32 iter_bkt; |
1188 | u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; | |
1189 | struct netlbl_unlhsh_iface *iface; | |
56196701 | 1190 | struct list_head *iter_list; |
61e10682 | 1191 | struct netlbl_af4list *addr4; |
dfd56b8b | 1192 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1193 | struct netlbl_af6list *addr6; |
1194 | #endif | |
8cc44579 PM |
1195 | |
1196 | cb_arg.nl_cb = cb; | |
1197 | cb_arg.skb = skb; | |
1198 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1199 | ||
1200 | rcu_read_lock(); | |
1201 | for (iter_bkt = skip_bkt; | |
1202 | iter_bkt < rcu_dereference(netlbl_unlhsh)->size; | |
1203 | iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) { | |
56196701 PM |
1204 | iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; |
1205 | list_for_each_entry_rcu(iface, iter_list, list) { | |
8cc44579 PM |
1206 | if (!iface->valid || |
1207 | iter_chain++ < skip_chain) | |
1208 | continue; | |
61e10682 PM |
1209 | netlbl_af4list_foreach_rcu(addr4, |
1210 | &iface->addr4_list) { | |
a6a8fe95 | 1211 | if (iter_addr4++ < cb->args[2]) |
8cc44579 PM |
1212 | continue; |
1213 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1214 | NLBL_UNLABEL_C_STATICLIST, |
1215 | iface, | |
1216 | netlbl_unlhsh_addr4_entry(addr4), | |
1217 | NULL, | |
1218 | &cb_arg) < 0) { | |
8cc44579 PM |
1219 | iter_addr4--; |
1220 | iter_chain--; | |
1221 | goto unlabel_staticlist_return; | |
1222 | } | |
1223 | } | |
dfd56b8b | 1224 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1225 | netlbl_af6list_foreach_rcu(addr6, |
1226 | &iface->addr6_list) { | |
a6a8fe95 | 1227 | if (iter_addr6++ < cb->args[3]) |
8cc44579 PM |
1228 | continue; |
1229 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1230 | NLBL_UNLABEL_C_STATICLIST, |
1231 | iface, | |
1232 | NULL, | |
1233 | netlbl_unlhsh_addr6_entry(addr6), | |
1234 | &cb_arg) < 0) { | |
8cc44579 PM |
1235 | iter_addr6--; |
1236 | iter_chain--; | |
1237 | goto unlabel_staticlist_return; | |
1238 | } | |
1239 | } | |
61e10682 | 1240 | #endif /* IPv6 */ |
8cc44579 PM |
1241 | } |
1242 | } | |
1243 | ||
1244 | unlabel_staticlist_return: | |
1245 | rcu_read_unlock(); | |
0c1233ab PM |
1246 | cb->args[0] = iter_bkt; |
1247 | cb->args[1] = iter_chain; | |
1248 | cb->args[2] = iter_addr4; | |
1249 | cb->args[3] = iter_addr6; | |
8cc44579 PM |
1250 | return skb->len; |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message | |
1255 | * @skb: the NETLINK buffer | |
1256 | * @cb: the NETLINK callback | |
1257 | * | |
1258 | * Description: | |
1259 | * Process a user generated STATICLISTDEF message and dump the default | |
1260 | * unlabeled connection entry in a form suitable for use in a kernel generated | |
1261 | * STATICLISTDEF message. Returns the length of @skb. | |
1262 | * | |
1263 | */ | |
1264 | static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, | |
1265 | struct netlink_callback *cb) | |
1266 | { | |
1267 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1268 | struct netlbl_unlhsh_iface *iface; | |
a6a8fe95 | 1269 | u32 iter_addr4 = 0, iter_addr6 = 0; |
61e10682 | 1270 | struct netlbl_af4list *addr4; |
dfd56b8b | 1271 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1272 | struct netlbl_af6list *addr6; |
1273 | #endif | |
8cc44579 PM |
1274 | |
1275 | cb_arg.nl_cb = cb; | |
1276 | cb_arg.skb = skb; | |
1277 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1278 | ||
1279 | rcu_read_lock(); | |
1280 | iface = rcu_dereference(netlbl_unlhsh_def); | |
1281 | if (iface == NULL || !iface->valid) | |
1282 | goto unlabel_staticlistdef_return; | |
1283 | ||
61e10682 | 1284 | netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
a6a8fe95 | 1285 | if (iter_addr4++ < cb->args[0]) |
8cc44579 PM |
1286 | continue; |
1287 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1288 | iface, |
1289 | netlbl_unlhsh_addr4_entry(addr4), | |
1290 | NULL, | |
1291 | &cb_arg) < 0) { | |
8cc44579 PM |
1292 | iter_addr4--; |
1293 | goto unlabel_staticlistdef_return; | |
1294 | } | |
1295 | } | |
dfd56b8b | 1296 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 | 1297 | netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { |
a6a8fe95 | 1298 | if (iter_addr6++ < cb->args[1]) |
8cc44579 PM |
1299 | continue; |
1300 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1301 | iface, |
1302 | NULL, | |
1303 | netlbl_unlhsh_addr6_entry(addr6), | |
1304 | &cb_arg) < 0) { | |
8cc44579 PM |
1305 | iter_addr6--; |
1306 | goto unlabel_staticlistdef_return; | |
1307 | } | |
1308 | } | |
61e10682 | 1309 | #endif /* IPv6 */ |
8cc44579 PM |
1310 | |
1311 | unlabel_staticlistdef_return: | |
1312 | rcu_read_unlock(); | |
0c1233ab PM |
1313 | cb->args[0] = iter_addr4; |
1314 | cb->args[1] = iter_addr6; | |
8cc44579 PM |
1315 | return skb->len; |
1316 | } | |
96cb8e33 PM |
1317 | |
1318 | /* | |
1319 | * NetLabel Generic NETLINK Command Definitions | |
1320 | */ | |
1321 | ||
4534de83 | 1322 | static const struct genl_ops netlbl_unlabel_genl_ops[] = { |
227c43c3 | 1323 | { |
8cc44579 PM |
1324 | .cmd = NLBL_UNLABEL_C_STATICADD, |
1325 | .flags = GENL_ADMIN_PERM, | |
1326 | .policy = netlbl_unlabel_genl_policy, | |
1327 | .doit = netlbl_unlabel_staticadd, | |
1328 | .dumpit = NULL, | |
227c43c3 PE |
1329 | }, |
1330 | { | |
8cc44579 PM |
1331 | .cmd = NLBL_UNLABEL_C_STATICREMOVE, |
1332 | .flags = GENL_ADMIN_PERM, | |
1333 | .policy = netlbl_unlabel_genl_policy, | |
1334 | .doit = netlbl_unlabel_staticremove, | |
1335 | .dumpit = NULL, | |
227c43c3 PE |
1336 | }, |
1337 | { | |
8cc44579 PM |
1338 | .cmd = NLBL_UNLABEL_C_STATICLIST, |
1339 | .flags = 0, | |
1340 | .policy = netlbl_unlabel_genl_policy, | |
1341 | .doit = NULL, | |
1342 | .dumpit = netlbl_unlabel_staticlist, | |
227c43c3 PE |
1343 | }, |
1344 | { | |
8cc44579 PM |
1345 | .cmd = NLBL_UNLABEL_C_STATICADDDEF, |
1346 | .flags = GENL_ADMIN_PERM, | |
1347 | .policy = netlbl_unlabel_genl_policy, | |
1348 | .doit = netlbl_unlabel_staticadddef, | |
1349 | .dumpit = NULL, | |
227c43c3 PE |
1350 | }, |
1351 | { | |
8cc44579 PM |
1352 | .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, |
1353 | .flags = GENL_ADMIN_PERM, | |
1354 | .policy = netlbl_unlabel_genl_policy, | |
1355 | .doit = netlbl_unlabel_staticremovedef, | |
1356 | .dumpit = NULL, | |
227c43c3 PE |
1357 | }, |
1358 | { | |
8cc44579 PM |
1359 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
1360 | .flags = 0, | |
1361 | .policy = netlbl_unlabel_genl_policy, | |
1362 | .doit = NULL, | |
1363 | .dumpit = netlbl_unlabel_staticlistdef, | |
227c43c3 PE |
1364 | }, |
1365 | { | |
96cb8e33 | 1366 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
fd385855 PM |
1367 | .flags = GENL_ADMIN_PERM, |
1368 | .policy = netlbl_unlabel_genl_policy, | |
96cb8e33 PM |
1369 | .doit = netlbl_unlabel_accept, |
1370 | .dumpit = NULL, | |
227c43c3 PE |
1371 | }, |
1372 | { | |
96cb8e33 PM |
1373 | .cmd = NLBL_UNLABEL_C_LIST, |
1374 | .flags = 0, | |
fd385855 | 1375 | .policy = netlbl_unlabel_genl_policy, |
96cb8e33 PM |
1376 | .doit = netlbl_unlabel_list, |
1377 | .dumpit = NULL, | |
227c43c3 | 1378 | }, |
96cb8e33 PM |
1379 | }; |
1380 | ||
96cb8e33 PM |
1381 | /* |
1382 | * NetLabel Generic NETLINK Protocol Functions | |
1383 | */ | |
1384 | ||
1385 | /** | |
1386 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
1387 | * | |
1388 | * Description: | |
1389 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
1390 | * mechanism. Returns zero on success, negative values on failure. | |
1391 | * | |
1392 | */ | |
05705e4e | 1393 | int __init netlbl_unlabel_genl_init(void) |
96cb8e33 | 1394 | { |
7ae740df | 1395 | return genl_register_family_with_ops(&netlbl_unlabel_gnl_family, |
c53ed742 | 1396 | netlbl_unlabel_genl_ops); |
96cb8e33 PM |
1397 | } |
1398 | ||
1399 | /* | |
1400 | * NetLabel KAPI Hooks | |
1401 | */ | |
1402 | ||
8cc44579 PM |
1403 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1404 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1405 | }; | |
1406 | ||
1407 | /** | |
1408 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1409 | * @size: the number of bits to use for the hash buckets | |
1410 | * | |
1411 | * Description: | |
1412 | * Initializes the unlabeled connection hash table and registers a network | |
1413 | * device notification handler. This function should only be called by the | |
1414 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1415 | * non-zero values on error. | |
1416 | * | |
1417 | */ | |
05705e4e | 1418 | int __init netlbl_unlabel_init(u32 size) |
8cc44579 PM |
1419 | { |
1420 | u32 iter; | |
1421 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1422 | ||
1423 | if (size == 0) | |
1424 | return -EINVAL; | |
1425 | ||
1426 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1427 | if (hsh_tbl == NULL) | |
1428 | return -ENOMEM; | |
1429 | hsh_tbl->size = 1 << size; | |
1430 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1431 | sizeof(struct list_head), | |
1432 | GFP_KERNEL); | |
1433 | if (hsh_tbl->tbl == NULL) { | |
1434 | kfree(hsh_tbl); | |
1435 | return -ENOMEM; | |
1436 | } | |
1437 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1438 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1439 | ||
8cc44579 | 1440 | spin_lock(&netlbl_unlhsh_lock); |
cf778b00 | 1441 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); |
8cc44579 | 1442 | spin_unlock(&netlbl_unlhsh_lock); |
8cc44579 PM |
1443 | |
1444 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1445 | ||
1446 | return 0; | |
1447 | } | |
1448 | ||
96cb8e33 PM |
1449 | /** |
1450 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1451 | * @skb: the packet |
1452 | * @family: protocol family | |
96cb8e33 PM |
1453 | * @secattr: the security attributes |
1454 | * | |
1455 | * Description: | |
1456 | * Determine the security attributes, if any, for an unlabled packet and return | |
1457 | * them in @secattr. Returns zero on success and negative values on failure. | |
1458 | * | |
1459 | */ | |
8cc44579 PM |
1460 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1461 | u16 family, | |
1462 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1463 | { |
8cc44579 PM |
1464 | struct netlbl_unlhsh_iface *iface; |
1465 | ||
1466 | rcu_read_lock(); | |
b914f3a2 | 1467 | iface = netlbl_unlhsh_search_iface(skb->skb_iif); |
8cc44579 | 1468 | if (iface == NULL) |
b914f3a2 PM |
1469 | iface = rcu_dereference(netlbl_unlhsh_def); |
1470 | if (iface == NULL || !iface->valid) | |
8cc44579 PM |
1471 | goto unlabel_getattr_nolabel; |
1472 | switch (family) { | |
56628b1d PE |
1473 | case PF_INET: { |
1474 | struct iphdr *hdr4; | |
61e10682 | 1475 | struct netlbl_af4list *addr4; |
56628b1d | 1476 | |
8cc44579 | 1477 | hdr4 = ip_hdr(skb); |
61e10682 PM |
1478 | addr4 = netlbl_af4list_search(hdr4->saddr, |
1479 | &iface->addr4_list); | |
8cc44579 PM |
1480 | if (addr4 == NULL) |
1481 | goto unlabel_getattr_nolabel; | |
61e10682 | 1482 | secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
8cc44579 | 1483 | break; |
56628b1d | 1484 | } |
dfd56b8b | 1485 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d PE |
1486 | case PF_INET6: { |
1487 | struct ipv6hdr *hdr6; | |
61e10682 | 1488 | struct netlbl_af6list *addr6; |
56628b1d | 1489 | |
8cc44579 | 1490 | hdr6 = ipv6_hdr(skb); |
61e10682 PM |
1491 | addr6 = netlbl_af6list_search(&hdr6->saddr, |
1492 | &iface->addr6_list); | |
8cc44579 PM |
1493 | if (addr6 == NULL) |
1494 | goto unlabel_getattr_nolabel; | |
61e10682 | 1495 | secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; |
8cc44579 | 1496 | break; |
56628b1d | 1497 | } |
8cc44579 PM |
1498 | #endif /* IPv6 */ |
1499 | default: | |
1500 | goto unlabel_getattr_nolabel; | |
1501 | } | |
1502 | rcu_read_unlock(); | |
1503 | ||
1504 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1505 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1506 | return 0; | |
1507 | ||
1508 | unlabel_getattr_nolabel: | |
1509 | rcu_read_unlock(); | |
c783f1ce PM |
1510 | if (netlabel_unlabel_acceptflg == 0) |
1511 | return -ENOMSG; | |
16efd454 | 1512 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1513 | return 0; |
96cb8e33 PM |
1514 | } |
1515 | ||
1516 | /** | |
1517 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1518 | * | |
1519 | * Description: | |
1520 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1521 | * and to send unlabeled network traffic by default. | |
1522 | * | |
1523 | */ | |
05705e4e | 1524 | int __init netlbl_unlabel_defconf(void) |
96cb8e33 PM |
1525 | { |
1526 | int ret_val; | |
1527 | struct netlbl_dom_map *entry; | |
95d4e6be | 1528 | struct netlbl_audit audit_info; |
32f50cde | 1529 | |
95d4e6be PM |
1530 | /* Only the kernel is allowed to call this function and the only time |
1531 | * it is called is at bootup before the audit subsystem is reporting | |
1532 | * messages so don't worry to much about these values. */ | |
1533 | security_task_getsecid(current, &audit_info.secid); | |
e1760bd5 | 1534 | audit_info.loginuid = GLOBAL_ROOT_UID; |
2532386f | 1535 | audit_info.sessionid = 0; |
96cb8e33 PM |
1536 | |
1537 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1538 | if (entry == NULL) | |
1539 | return -ENOMEM; | |
6a8b7f0c | 1540 | entry->def.type = NETLBL_NLTYPE_UNLABELED; |
95d4e6be | 1541 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1542 | if (ret_val != 0) |
1543 | return ret_val; | |
1544 | ||
95d4e6be | 1545 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1546 | |
1547 | return 0; | |
1548 | } |