Commit | Line | Data |
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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 | * | |
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 | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <linux/types.h> | |
8cc44579 | 32 | #include <linux/rcupdate.h> |
96cb8e33 PM |
33 | #include <linux/list.h> |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/skbuff.h> | |
de64688f | 38 | #include <linux/audit.h> |
8cc44579 PM |
39 | #include <linux/in.h> |
40 | #include <linux/in6.h> | |
41 | #include <linux/ip.h> | |
42 | #include <linux/ipv6.h> | |
43 | #include <linux/notifier.h> | |
44 | #include <linux/netdevice.h> | |
45 | #include <linux/security.h> | |
5a0e3ad6 | 46 | #include <linux/slab.h> |
96cb8e33 PM |
47 | #include <net/sock.h> |
48 | #include <net/netlink.h> | |
49 | #include <net/genetlink.h> | |
8cc44579 PM |
50 | #include <net/ip.h> |
51 | #include <net/ipv6.h> | |
52 | #include <net/net_namespace.h> | |
96cb8e33 PM |
53 | #include <net/netlabel.h> |
54 | #include <asm/bug.h> | |
60063497 | 55 | #include <linux/atomic.h> |
96cb8e33 PM |
56 | |
57 | #include "netlabel_user.h" | |
61e10682 | 58 | #include "netlabel_addrlist.h" |
96cb8e33 PM |
59 | #include "netlabel_domainhash.h" |
60 | #include "netlabel_unlabeled.h" | |
8cc44579 PM |
61 | #include "netlabel_mgmt.h" |
62 | ||
63 | /* NOTE: at present we always use init's network namespace since we don't | |
64 | * presently support different namespaces even though the majority of | |
65 | * the functions in this file are "namespace safe" */ | |
66 | ||
67 | /* The unlabeled connection hash table which we use to map network interfaces | |
68 | * and addresses of unlabeled packets to a user specified secid value for the | |
69 | * LSM. The hash table is used to lookup the network interface entry | |
70 | * (struct netlbl_unlhsh_iface) and then the interface entry is used to | |
71 | * lookup an IP address match from an ordered list. If a network interface | |
72 | * match can not be found in the hash table then the default entry | |
73 | * (netlbl_unlhsh_def) is used. The IP address entry list | |
74 | * (struct netlbl_unlhsh_addr) is ordered such that the entries with a | |
75 | * larger netmask come first. | |
76 | */ | |
77 | struct netlbl_unlhsh_tbl { | |
78 | struct list_head *tbl; | |
79 | u32 size; | |
80 | }; | |
61e10682 PM |
81 | #define netlbl_unlhsh_addr4_entry(iter) \ |
82 | container_of(iter, struct netlbl_unlhsh_addr4, list) | |
8cc44579 | 83 | struct netlbl_unlhsh_addr4 { |
8cc44579 PM |
84 | u32 secid; |
85 | ||
61e10682 | 86 | struct netlbl_af4list list; |
8cc44579 PM |
87 | struct rcu_head rcu; |
88 | }; | |
61e10682 PM |
89 | #define netlbl_unlhsh_addr6_entry(iter) \ |
90 | container_of(iter, struct netlbl_unlhsh_addr6, list) | |
8cc44579 | 91 | struct netlbl_unlhsh_addr6 { |
8cc44579 PM |
92 | u32 secid; |
93 | ||
61e10682 | 94 | struct netlbl_af6list list; |
8cc44579 PM |
95 | struct rcu_head rcu; |
96 | }; | |
97 | struct netlbl_unlhsh_iface { | |
98 | int ifindex; | |
99 | struct list_head addr4_list; | |
100 | struct list_head addr6_list; | |
101 | ||
102 | u32 valid; | |
103 | struct list_head list; | |
104 | struct rcu_head rcu; | |
105 | }; | |
106 | ||
107 | /* Argument struct for netlbl_unlhsh_walk() */ | |
108 | struct netlbl_unlhsh_walk_arg { | |
109 | struct netlink_callback *nl_cb; | |
110 | struct sk_buff *skb; | |
111 | u32 seq; | |
112 | }; | |
113 | ||
114 | /* Unlabeled connection hash table */ | |
115 | /* updates should be so rare that having one spinlock for the entire | |
116 | * hash table should be okay */ | |
117 | static DEFINE_SPINLOCK(netlbl_unlhsh_lock); | |
b914f3a2 | 118 | #define netlbl_unlhsh_rcu_deref(p) \ |
d8bf4ca9 | 119 | rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock)) |
8cc44579 PM |
120 | static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL; |
121 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL; | |
96cb8e33 PM |
122 | |
123 | /* Accept unlabeled packets flag */ | |
cd28786d | 124 | static u8 netlabel_unlabel_acceptflg = 0; |
96cb8e33 | 125 | |
8cc44579 | 126 | /* NetLabel Generic NETLINK unlabeled family */ |
96cb8e33 PM |
127 | static struct genl_family netlbl_unlabel_gnl_family = { |
128 | .id = GENL_ID_GENERATE, | |
129 | .hdrsize = 0, | |
130 | .name = NETLBL_NLTYPE_UNLABELED_NAME, | |
131 | .version = NETLBL_PROTO_VERSION, | |
fd385855 | 132 | .maxattr = NLBL_UNLABEL_A_MAX, |
96cb8e33 PM |
133 | }; |
134 | ||
fd385855 | 135 | /* NetLabel Netlink attribute policy */ |
ef7c79ed | 136 | static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
fd385855 | 137 | [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
8cc44579 PM |
138 | [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY, |
139 | .len = sizeof(struct in6_addr) }, | |
140 | [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY, | |
141 | .len = sizeof(struct in6_addr) }, | |
142 | [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY, | |
143 | .len = sizeof(struct in_addr) }, | |
144 | [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY, | |
145 | .len = sizeof(struct in_addr) }, | |
146 | [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING, | |
147 | .len = IFNAMSIZ - 1 }, | |
148 | [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY } | |
fd385855 | 149 | }; |
96cb8e33 | 150 | |
32f50cde | 151 | /* |
8cc44579 PM |
152 | * Unlabeled Connection Hash Table Functions |
153 | */ | |
154 | ||
8cc44579 PM |
155 | /** |
156 | * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table | |
157 | * @entry: the entry's RCU field | |
158 | * | |
159 | * Description: | |
160 | * This function is designed to be used as a callback to the call_rcu() | |
161 | * function so that memory allocated to a hash table interface entry can be | |
162 | * released safely. It is important to note that this function does not free | |
163 | * the IPv4 and IPv6 address lists contained as part of an interface entry. It | |
164 | * is up to the rest of the code to make sure an interface entry is only freed | |
165 | * once it's address lists are empty. | |
166 | * | |
167 | */ | |
168 | static void netlbl_unlhsh_free_iface(struct rcu_head *entry) | |
169 | { | |
170 | struct netlbl_unlhsh_iface *iface; | |
61e10682 PM |
171 | struct netlbl_af4list *iter4; |
172 | struct netlbl_af4list *tmp4; | |
dfd56b8b | 173 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
174 | struct netlbl_af6list *iter6; |
175 | struct netlbl_af6list *tmp6; | |
176 | #endif /* IPv6 */ | |
8cc44579 PM |
177 | |
178 | iface = container_of(entry, struct netlbl_unlhsh_iface, rcu); | |
179 | ||
180 | /* no need for locks here since we are the only one with access to this | |
181 | * structure */ | |
182 | ||
61e10682 PM |
183 | netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) { |
184 | netlbl_af4list_remove_entry(iter4); | |
185 | kfree(netlbl_unlhsh_addr4_entry(iter4)); | |
186 | } | |
dfd56b8b | 187 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
188 | netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) { |
189 | netlbl_af6list_remove_entry(iter6); | |
190 | kfree(netlbl_unlhsh_addr6_entry(iter6)); | |
191 | } | |
192 | #endif /* IPv6 */ | |
8cc44579 PM |
193 | kfree(iface); |
194 | } | |
195 | ||
196 | /** | |
197 | * netlbl_unlhsh_hash - Hashing function for the hash table | |
198 | * @ifindex: the network interface/device to hash | |
199 | * | |
200 | * Description: | |
201 | * This is the hashing function for the unlabeled hash table, it returns the | |
202 | * bucket number for the given device/interface. The caller is responsible for | |
b914f3a2 PM |
203 | * ensuring that the hash table is protected with either a RCU read lock or |
204 | * the hash table lock. | |
8cc44579 PM |
205 | * |
206 | */ | |
207 | static u32 netlbl_unlhsh_hash(int ifindex) | |
208 | { | |
b914f3a2 | 209 | return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1); |
8cc44579 PM |
210 | } |
211 | ||
8cc44579 PM |
212 | /** |
213 | * netlbl_unlhsh_search_iface - Search for a matching interface entry | |
214 | * @ifindex: the network interface | |
215 | * | |
216 | * Description: | |
217 | * Searches the unlabeled connection hash table and returns a pointer to the | |
218 | * interface entry which matches @ifindex, otherwise NULL is returned. The | |
b914f3a2 PM |
219 | * caller is responsible for ensuring that the hash table is protected with |
220 | * either a RCU read lock or the hash table lock. | |
8cc44579 PM |
221 | * |
222 | */ | |
223 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex) | |
224 | { | |
225 | u32 bkt; | |
56196701 | 226 | struct list_head *bkt_list; |
8cc44579 PM |
227 | struct netlbl_unlhsh_iface *iter; |
228 | ||
229 | bkt = netlbl_unlhsh_hash(ifindex); | |
b914f3a2 | 230 | bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]; |
56196701 | 231 | list_for_each_entry_rcu(iter, bkt_list, list) |
8cc44579 PM |
232 | if (iter->valid && iter->ifindex == ifindex) |
233 | return iter; | |
234 | ||
235 | return NULL; | |
236 | } | |
237 | ||
8cc44579 PM |
238 | /** |
239 | * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table | |
240 | * @iface: the associated interface entry | |
241 | * @addr: IPv4 address in network byte order | |
242 | * @mask: IPv4 address mask in network byte order | |
243 | * @secid: LSM secid value for entry | |
244 | * | |
245 | * Description: | |
246 | * Add a new address entry into the unlabeled connection hash table using the | |
247 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 248 | * a negative value is returned. |
8cc44579 | 249 | * |
32f50cde | 250 | */ |
8cc44579 PM |
251 | static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, |
252 | const struct in_addr *addr, | |
253 | const struct in_addr *mask, | |
254 | u32 secid) | |
255 | { | |
61e10682 | 256 | int ret_val; |
8cc44579 | 257 | struct netlbl_unlhsh_addr4 *entry; |
8cc44579 PM |
258 | |
259 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
260 | if (entry == NULL) | |
261 | return -ENOMEM; | |
262 | ||
61e10682 PM |
263 | entry->list.addr = addr->s_addr & mask->s_addr; |
264 | entry->list.mask = mask->s_addr; | |
265 | entry->list.valid = 1; | |
61e10682 | 266 | entry->secid = secid; |
8cc44579 PM |
267 | |
268 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 269 | ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); |
8cc44579 | 270 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
271 | |
272 | if (ret_val != 0) | |
273 | kfree(entry); | |
274 | return ret_val; | |
8cc44579 PM |
275 | } |
276 | ||
dfd56b8b | 277 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 PM |
278 | /** |
279 | * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table | |
280 | * @iface: the associated interface entry | |
281 | * @addr: IPv6 address in network byte order | |
282 | * @mask: IPv6 address mask in network byte order | |
283 | * @secid: LSM secid value for entry | |
284 | * | |
285 | * Description: | |
286 | * Add a new address entry into the unlabeled connection hash table using the | |
287 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 288 | * a negative value is returned. |
8cc44579 PM |
289 | * |
290 | */ | |
291 | static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, | |
292 | const struct in6_addr *addr, | |
293 | const struct in6_addr *mask, | |
294 | u32 secid) | |
295 | { | |
61e10682 | 296 | int ret_val; |
8cc44579 | 297 | struct netlbl_unlhsh_addr6 *entry; |
8cc44579 PM |
298 | |
299 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
300 | if (entry == NULL) | |
301 | return -ENOMEM; | |
302 | ||
4e3fd7a0 | 303 | entry->list.addr = *addr; |
61e10682 PM |
304 | entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; |
305 | entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; | |
306 | entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; | |
307 | entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; | |
4e3fd7a0 | 308 | entry->list.mask = *mask; |
61e10682 | 309 | entry->list.valid = 1; |
61e10682 | 310 | entry->secid = secid; |
8cc44579 PM |
311 | |
312 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 313 | ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); |
8cc44579 | 314 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
315 | |
316 | if (ret_val != 0) | |
317 | kfree(entry); | |
8cc44579 PM |
318 | return 0; |
319 | } | |
320 | #endif /* IPv6 */ | |
321 | ||
322 | /** | |
323 | * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table | |
324 | * @ifindex: network interface | |
325 | * | |
326 | * Description: | |
327 | * Add a new, empty, interface entry into the unlabeled connection hash table. | |
328 | * On success a pointer to the new interface entry is returned, on failure NULL | |
b914f3a2 | 329 | * is returned. |
8cc44579 PM |
330 | * |
331 | */ | |
332 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) | |
333 | { | |
334 | u32 bkt; | |
335 | struct netlbl_unlhsh_iface *iface; | |
336 | ||
337 | iface = kzalloc(sizeof(*iface), GFP_ATOMIC); | |
338 | if (iface == NULL) | |
339 | return NULL; | |
340 | ||
341 | iface->ifindex = ifindex; | |
342 | INIT_LIST_HEAD(&iface->addr4_list); | |
343 | INIT_LIST_HEAD(&iface->addr6_list); | |
344 | iface->valid = 1; | |
8cc44579 PM |
345 | |
346 | spin_lock(&netlbl_unlhsh_lock); | |
347 | if (ifindex > 0) { | |
348 | bkt = netlbl_unlhsh_hash(ifindex); | |
349 | if (netlbl_unlhsh_search_iface(ifindex) != NULL) | |
350 | goto add_iface_failure; | |
351 | list_add_tail_rcu(&iface->list, | |
b914f3a2 | 352 | &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]); |
8cc44579 PM |
353 | } else { |
354 | INIT_LIST_HEAD(&iface->list); | |
b914f3a2 | 355 | if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL) |
8cc44579 | 356 | goto add_iface_failure; |
cf778b00 | 357 | rcu_assign_pointer(netlbl_unlhsh_def, iface); |
8cc44579 PM |
358 | } |
359 | spin_unlock(&netlbl_unlhsh_lock); | |
360 | ||
361 | return iface; | |
362 | ||
363 | add_iface_failure: | |
364 | spin_unlock(&netlbl_unlhsh_lock); | |
365 | kfree(iface); | |
366 | return NULL; | |
367 | } | |
368 | ||
369 | /** | |
370 | * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table | |
371 | * @net: network namespace | |
372 | * @dev_name: interface name | |
373 | * @addr: IP address in network byte order | |
374 | * @mask: address mask in network byte order | |
375 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
376 | * @secid: LSM secid value for the entry | |
13541b3a | 377 | * @audit_info: NetLabel audit information |
8cc44579 PM |
378 | * |
379 | * Description: | |
380 | * Adds a new entry to the unlabeled connection hash table. Returns zero on | |
381 | * success, negative values on failure. | |
382 | * | |
383 | */ | |
6c2e8ac0 PM |
384 | int netlbl_unlhsh_add(struct net *net, |
385 | const char *dev_name, | |
386 | const void *addr, | |
387 | const void *mask, | |
388 | u32 addr_len, | |
389 | u32 secid, | |
390 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
391 | { |
392 | int ret_val; | |
393 | int ifindex; | |
394 | struct net_device *dev; | |
395 | struct netlbl_unlhsh_iface *iface; | |
13541b3a PM |
396 | struct audit_buffer *audit_buf = NULL; |
397 | char *secctx = NULL; | |
398 | u32 secctx_len; | |
8cc44579 PM |
399 | |
400 | if (addr_len != sizeof(struct in_addr) && | |
401 | addr_len != sizeof(struct in6_addr)) | |
402 | return -EINVAL; | |
403 | ||
404 | rcu_read_lock(); | |
405 | if (dev_name != NULL) { | |
122ec6ff | 406 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
407 | if (dev == NULL) { |
408 | ret_val = -ENODEV; | |
409 | goto unlhsh_add_return; | |
410 | } | |
411 | ifindex = dev->ifindex; | |
8cc44579 PM |
412 | iface = netlbl_unlhsh_search_iface(ifindex); |
413 | } else { | |
414 | ifindex = 0; | |
415 | iface = rcu_dereference(netlbl_unlhsh_def); | |
416 | } | |
417 | if (iface == NULL) { | |
418 | iface = netlbl_unlhsh_add_iface(ifindex); | |
419 | if (iface == NULL) { | |
420 | ret_val = -ENOMEM; | |
421 | goto unlhsh_add_return; | |
422 | } | |
423 | } | |
13541b3a PM |
424 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, |
425 | audit_info); | |
8cc44579 | 426 | switch (addr_len) { |
56628b1d | 427 | case sizeof(struct in_addr): { |
ea110733 JP |
428 | const struct in_addr *addr4 = addr; |
429 | const struct in_addr *mask4 = mask; | |
56628b1d | 430 | |
13541b3a PM |
431 | ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); |
432 | if (audit_buf != NULL) | |
63c41688 PM |
433 | netlbl_af4list_audit_addr(audit_buf, 1, |
434 | dev_name, | |
435 | addr4->s_addr, | |
436 | mask4->s_addr); | |
8cc44579 | 437 | break; |
56628b1d | 438 | } |
dfd56b8b | 439 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d | 440 | case sizeof(struct in6_addr): { |
ea110733 JP |
441 | const struct in6_addr *addr6 = addr; |
442 | const struct in6_addr *mask6 = mask; | |
56628b1d | 443 | |
13541b3a PM |
444 | ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); |
445 | if (audit_buf != NULL) | |
63c41688 PM |
446 | netlbl_af6list_audit_addr(audit_buf, 1, |
447 | dev_name, | |
448 | addr6, mask6); | |
8cc44579 | 449 | break; |
56628b1d | 450 | } |
8cc44579 PM |
451 | #endif /* IPv6 */ |
452 | default: | |
453 | ret_val = -EINVAL; | |
454 | } | |
455 | if (ret_val == 0) | |
456 | atomic_inc(&netlabel_mgmt_protocount); | |
457 | ||
458 | unlhsh_add_return: | |
459 | rcu_read_unlock(); | |
13541b3a PM |
460 | if (audit_buf != NULL) { |
461 | if (security_secid_to_secctx(secid, | |
462 | &secctx, | |
463 | &secctx_len) == 0) { | |
464 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
465 | security_release_secctx(secctx, secctx_len); | |
466 | } | |
467 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
468 | audit_log_end(audit_buf); | |
469 | } | |
8cc44579 PM |
470 | return ret_val; |
471 | } | |
472 | ||
473 | /** | |
474 | * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry | |
13541b3a | 475 | * @net: network namespace |
8cc44579 PM |
476 | * @iface: interface entry |
477 | * @addr: IP address | |
478 | * @mask: IP address mask | |
13541b3a | 479 | * @audit_info: NetLabel audit information |
8cc44579 PM |
480 | * |
481 | * Description: | |
482 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 483 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
484 | * |
485 | */ | |
13541b3a PM |
486 | static int netlbl_unlhsh_remove_addr4(struct net *net, |
487 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 488 | const struct in_addr *addr, |
13541b3a PM |
489 | const struct in_addr *mask, |
490 | struct netlbl_audit *audit_info) | |
8cc44579 | 491 | { |
61e10682 | 492 | struct netlbl_af4list *list_entry; |
8cc44579 | 493 | struct netlbl_unlhsh_addr4 *entry; |
61e10682 | 494 | struct audit_buffer *audit_buf; |
13541b3a | 495 | struct net_device *dev; |
61e10682 | 496 | char *secctx; |
13541b3a | 497 | u32 secctx_len; |
8cc44579 PM |
498 | |
499 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
500 | list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, |
501 | &iface->addr4_list); | |
8cc44579 | 502 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
503 | if (list_entry != NULL) |
504 | entry = netlbl_unlhsh_addr4_entry(list_entry); | |
505 | else | |
ec8f2375 | 506 | entry = NULL; |
8cc44579 | 507 | |
13541b3a PM |
508 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
509 | audit_info); | |
510 | if (audit_buf != NULL) { | |
511 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
512 | netlbl_af4list_audit_addr(audit_buf, 1, |
513 | (dev != NULL ? dev->name : NULL), | |
514 | addr->s_addr, mask->s_addr); | |
13541b3a PM |
515 | if (dev != NULL) |
516 | dev_put(dev); | |
ec8f2375 PM |
517 | if (entry != NULL && |
518 | security_secid_to_secctx(entry->secid, | |
519 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
520 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
521 | security_release_secctx(secctx, secctx_len); | |
522 | } | |
ec8f2375 | 523 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
524 | audit_log_end(audit_buf); |
525 | } | |
526 | ||
ec8f2375 PM |
527 | if (entry == NULL) |
528 | return -ENOENT; | |
529 | ||
c3b49420 | 530 | kfree_rcu(entry, rcu); |
ec8f2375 | 531 | return 0; |
8cc44579 PM |
532 | } |
533 | ||
dfd56b8b | 534 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 PM |
535 | /** |
536 | * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry | |
13541b3a | 537 | * @net: network namespace |
8cc44579 PM |
538 | * @iface: interface entry |
539 | * @addr: IP address | |
540 | * @mask: IP address mask | |
13541b3a | 541 | * @audit_info: NetLabel audit information |
8cc44579 PM |
542 | * |
543 | * Description: | |
544 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 545 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
546 | * |
547 | */ | |
13541b3a PM |
548 | static int netlbl_unlhsh_remove_addr6(struct net *net, |
549 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 550 | const struct in6_addr *addr, |
13541b3a PM |
551 | const struct in6_addr *mask, |
552 | struct netlbl_audit *audit_info) | |
8cc44579 | 553 | { |
61e10682 | 554 | struct netlbl_af6list *list_entry; |
8cc44579 | 555 | struct netlbl_unlhsh_addr6 *entry; |
61e10682 | 556 | struct audit_buffer *audit_buf; |
13541b3a | 557 | struct net_device *dev; |
61e10682 | 558 | char *secctx; |
13541b3a | 559 | u32 secctx_len; |
8cc44579 PM |
560 | |
561 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 562 | list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); |
8cc44579 | 563 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
564 | if (list_entry != NULL) |
565 | entry = netlbl_unlhsh_addr6_entry(list_entry); | |
566 | else | |
ec8f2375 | 567 | entry = NULL; |
8cc44579 | 568 | |
13541b3a PM |
569 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
570 | audit_info); | |
571 | if (audit_buf != NULL) { | |
572 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
573 | netlbl_af6list_audit_addr(audit_buf, 1, |
574 | (dev != NULL ? dev->name : NULL), | |
575 | addr, mask); | |
13541b3a PM |
576 | if (dev != NULL) |
577 | dev_put(dev); | |
ec8f2375 PM |
578 | if (entry != NULL && |
579 | security_secid_to_secctx(entry->secid, | |
580 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
581 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
582 | security_release_secctx(secctx, secctx_len); | |
583 | } | |
ec8f2375 | 584 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
585 | audit_log_end(audit_buf); |
586 | } | |
587 | ||
ec8f2375 PM |
588 | if (entry == NULL) |
589 | return -ENOENT; | |
590 | ||
6b262232 | 591 | kfree_rcu(entry, rcu); |
ec8f2375 | 592 | return 0; |
8cc44579 PM |
593 | } |
594 | #endif /* IPv6 */ | |
595 | ||
596 | /** | |
597 | * netlbl_unlhsh_condremove_iface - Remove an interface entry | |
598 | * @iface: the interface entry | |
599 | * | |
600 | * Description: | |
601 | * Remove an interface entry from the unlabeled connection hash table if it is | |
602 | * empty. An interface entry is considered to be empty if there are no | |
603 | * address entries assigned to it. | |
604 | * | |
605 | */ | |
606 | static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) | |
607 | { | |
61e10682 | 608 | struct netlbl_af4list *iter4; |
dfd56b8b | 609 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
610 | struct netlbl_af6list *iter6; |
611 | #endif /* IPv6 */ | |
8cc44579 PM |
612 | |
613 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
614 | netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list) |
615 | goto unlhsh_condremove_failure; | |
dfd56b8b | 616 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
617 | netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list) |
618 | goto unlhsh_condremove_failure; | |
619 | #endif /* IPv6 */ | |
8cc44579 PM |
620 | iface->valid = 0; |
621 | if (iface->ifindex > 0) | |
622 | list_del_rcu(&iface->list); | |
623 | else | |
a9b3cd7f | 624 | RCU_INIT_POINTER(netlbl_unlhsh_def, NULL); |
8cc44579 PM |
625 | spin_unlock(&netlbl_unlhsh_lock); |
626 | ||
627 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
628 | return; | |
629 | ||
630 | unlhsh_condremove_failure: | |
631 | spin_unlock(&netlbl_unlhsh_lock); | |
8cc44579 PM |
632 | } |
633 | ||
634 | /** | |
635 | * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table | |
636 | * @net: network namespace | |
637 | * @dev_name: interface name | |
638 | * @addr: IP address in network byte order | |
639 | * @mask: address mask in network byte order | |
640 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
13541b3a | 641 | * @audit_info: NetLabel audit information |
8cc44579 PM |
642 | * |
643 | * Description: | |
644 | * Removes and existing entry from the unlabeled connection hash table. | |
645 | * Returns zero on success, negative values on failure. | |
646 | * | |
647 | */ | |
6c2e8ac0 PM |
648 | int netlbl_unlhsh_remove(struct net *net, |
649 | const char *dev_name, | |
650 | const void *addr, | |
651 | const void *mask, | |
652 | u32 addr_len, | |
653 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
654 | { |
655 | int ret_val; | |
656 | struct net_device *dev; | |
657 | struct netlbl_unlhsh_iface *iface; | |
658 | ||
659 | if (addr_len != sizeof(struct in_addr) && | |
660 | addr_len != sizeof(struct in6_addr)) | |
661 | return -EINVAL; | |
662 | ||
663 | rcu_read_lock(); | |
664 | if (dev_name != NULL) { | |
122ec6ff | 665 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
666 | if (dev == NULL) { |
667 | ret_val = -ENODEV; | |
668 | goto unlhsh_remove_return; | |
669 | } | |
670 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
8cc44579 PM |
671 | } else |
672 | iface = rcu_dereference(netlbl_unlhsh_def); | |
673 | if (iface == NULL) { | |
674 | ret_val = -ENOENT; | |
675 | goto unlhsh_remove_return; | |
676 | } | |
677 | switch (addr_len) { | |
678 | case sizeof(struct in_addr): | |
13541b3a PM |
679 | ret_val = netlbl_unlhsh_remove_addr4(net, |
680 | iface, addr, mask, | |
681 | audit_info); | |
8cc44579 | 682 | break; |
dfd56b8b | 683 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 | 684 | case sizeof(struct in6_addr): |
13541b3a PM |
685 | ret_val = netlbl_unlhsh_remove_addr6(net, |
686 | iface, addr, mask, | |
687 | audit_info); | |
8cc44579 PM |
688 | break; |
689 | #endif /* IPv6 */ | |
690 | default: | |
691 | ret_val = -EINVAL; | |
692 | } | |
693 | if (ret_val == 0) { | |
694 | netlbl_unlhsh_condremove_iface(iface); | |
695 | atomic_dec(&netlabel_mgmt_protocount); | |
696 | } | |
697 | ||
698 | unlhsh_remove_return: | |
699 | rcu_read_unlock(); | |
700 | return ret_val; | |
701 | } | |
702 | ||
703 | /* | |
704 | * General Helper Functions | |
705 | */ | |
706 | ||
707 | /** | |
708 | * netlbl_unlhsh_netdev_handler - Network device notification handler | |
709 | * @this: notifier block | |
710 | * @event: the event | |
711 | * @ptr: the network device (cast to void) | |
712 | * | |
713 | * Description: | |
714 | * Handle network device events, although at present all we care about is a | |
715 | * network device going away. In the case of a device going away we clear any | |
716 | * related entries from the unlabeled connection hash table. | |
717 | * | |
718 | */ | |
719 | static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, | |
720 | unsigned long event, | |
721 | void *ptr) | |
722 | { | |
723 | struct net_device *dev = ptr; | |
724 | struct netlbl_unlhsh_iface *iface = NULL; | |
725 | ||
721499e8 | 726 | if (!net_eq(dev_net(dev), &init_net)) |
8cc44579 PM |
727 | return NOTIFY_DONE; |
728 | ||
729 | /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ | |
730 | if (event == NETDEV_DOWN) { | |
731 | spin_lock(&netlbl_unlhsh_lock); | |
732 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
733 | if (iface != NULL && iface->valid) { | |
734 | iface->valid = 0; | |
735 | list_del_rcu(&iface->list); | |
736 | } else | |
737 | iface = NULL; | |
738 | spin_unlock(&netlbl_unlhsh_lock); | |
739 | } | |
740 | ||
741 | if (iface != NULL) | |
742 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
743 | ||
744 | return NOTIFY_DONE; | |
745 | } | |
32f50cde PM |
746 | |
747 | /** | |
748 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
749 | * @value: desired value | |
95d4e6be | 750 | * @audit_info: NetLabel audit information |
32f50cde PM |
751 | * |
752 | * Description: | |
753 | * Set the value of the unlabeled accept flag to @value. | |
754 | * | |
755 | */ | |
95d4e6be PM |
756 | static void netlbl_unlabel_acceptflg_set(u8 value, |
757 | struct netlbl_audit *audit_info) | |
32f50cde | 758 | { |
95d4e6be PM |
759 | struct audit_buffer *audit_buf; |
760 | u8 old_val; | |
761 | ||
4be2700f | 762 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 763 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
764 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
765 | audit_info); | |
de64688f PM |
766 | if (audit_buf != NULL) { |
767 | audit_log_format(audit_buf, | |
768 | " unlbl_accept=%u old=%u", value, old_val); | |
769 | audit_log_end(audit_buf); | |
770 | } | |
32f50cde PM |
771 | } |
772 | ||
8cc44579 PM |
773 | /** |
774 | * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information | |
775 | * @info: the Generic NETLINK info block | |
776 | * @addr: the IP address | |
777 | * @mask: the IP address mask | |
778 | * @len: the address length | |
779 | * | |
780 | * Description: | |
781 | * Examine the Generic NETLINK message and extract the IP address information. | |
782 | * Returns zero on success, negative values on failure. | |
783 | * | |
784 | */ | |
785 | static int netlbl_unlabel_addrinfo_get(struct genl_info *info, | |
786 | void **addr, | |
787 | void **mask, | |
788 | u32 *len) | |
789 | { | |
790 | u32 addr_len; | |
791 | ||
792 | if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) { | |
793 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
794 | if (addr_len != sizeof(struct in_addr) && | |
795 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) | |
796 | return -EINVAL; | |
797 | *len = addr_len; | |
798 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
799 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); | |
800 | return 0; | |
801 | } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { | |
802 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
803 | if (addr_len != sizeof(struct in6_addr) && | |
804 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) | |
805 | return -EINVAL; | |
806 | *len = addr_len; | |
807 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
808 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); | |
809 | return 0; | |
810 | } | |
811 | ||
812 | return -EINVAL; | |
813 | } | |
814 | ||
96cb8e33 PM |
815 | /* |
816 | * NetLabel Command Handlers | |
817 | */ | |
818 | ||
819 | /** | |
820 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
821 | * @skb: the NETLINK buffer | |
822 | * @info: the Generic NETLINK info block | |
823 | * | |
824 | * Description: | |
825 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
826 | * Returns zero on success, negative values on failure. | |
827 | * | |
828 | */ | |
829 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
830 | { | |
fd385855 | 831 | u8 value; |
95d4e6be | 832 | struct netlbl_audit audit_info; |
96cb8e33 | 833 | |
fd385855 PM |
834 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
835 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 836 | if (value == 1 || value == 0) { |
95d4e6be PM |
837 | netlbl_netlink_auditinfo(skb, &audit_info); |
838 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 839 | return 0; |
96cb8e33 PM |
840 | } |
841 | } | |
842 | ||
32f50cde | 843 | return -EINVAL; |
96cb8e33 PM |
844 | } |
845 | ||
846 | /** | |
847 | * netlbl_unlabel_list - Handle a LIST message | |
848 | * @skb: the NETLINK buffer | |
849 | * @info: the Generic NETLINK info block | |
850 | * | |
851 | * Description: | |
852 | * Process a user generated LIST message and respond with the current status. | |
853 | * Returns zero on success, negative values on failure. | |
854 | * | |
855 | */ | |
856 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
857 | { | |
fd385855 | 858 | int ret_val = -EINVAL; |
96cb8e33 | 859 | struct sk_buff *ans_skb; |
fd385855 | 860 | void *data; |
96cb8e33 | 861 | |
339bf98f | 862 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
863 | if (ans_skb == NULL) |
864 | goto list_failure; | |
17c157c8 TG |
865 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
866 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
867 | if (data == NULL) { |
868 | ret_val = -ENOMEM; | |
96cb8e33 | 869 | goto list_failure; |
fd385855 | 870 | } |
96cb8e33 | 871 | |
fd385855 PM |
872 | ret_val = nla_put_u8(ans_skb, |
873 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 874 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
875 | if (ret_val != 0) |
876 | goto list_failure; | |
877 | ||
fd385855 | 878 | genlmsg_end(ans_skb, data); |
fe785bee | 879 | return genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
880 | |
881 | list_failure: | |
b08d5840 | 882 | kfree_skb(ans_skb); |
96cb8e33 PM |
883 | return ret_val; |
884 | } | |
885 | ||
8cc44579 PM |
886 | /** |
887 | * netlbl_unlabel_staticadd - Handle a STATICADD message | |
888 | * @skb: the NETLINK buffer | |
889 | * @info: the Generic NETLINK info block | |
890 | * | |
891 | * Description: | |
892 | * Process a user generated STATICADD message and add a new unlabeled | |
893 | * connection entry to the hash table. Returns zero on success, negative | |
894 | * values on failure. | |
895 | * | |
896 | */ | |
897 | static int netlbl_unlabel_staticadd(struct sk_buff *skb, | |
898 | struct genl_info *info) | |
899 | { | |
900 | int ret_val; | |
901 | char *dev_name; | |
902 | void *addr; | |
903 | void *mask; | |
904 | u32 addr_len; | |
905 | u32 secid; | |
13541b3a | 906 | struct netlbl_audit audit_info; |
8cc44579 PM |
907 | |
908 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
909 | * single entry. However, allow users to create two entries, one each | |
910 | * for IPv4 and IPv4, with the same LSM security context which should | |
911 | * achieve the same result. */ | |
912 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
913 | !info->attrs[NLBL_UNLABEL_A_IFACE] || | |
914 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
915 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
916 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
917 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
918 | return -EINVAL; | |
919 | ||
13541b3a PM |
920 | netlbl_netlink_auditinfo(skb, &audit_info); |
921 | ||
8cc44579 PM |
922 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
923 | if (ret_val != 0) | |
924 | return ret_val; | |
925 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
926 | ret_val = security_secctx_to_secid( | |
927 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
928 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
929 | &secid); | |
930 | if (ret_val != 0) | |
931 | return ret_val; | |
932 | ||
933 | return netlbl_unlhsh_add(&init_net, | |
13541b3a PM |
934 | dev_name, addr, mask, addr_len, secid, |
935 | &audit_info); | |
8cc44579 PM |
936 | } |
937 | ||
938 | /** | |
939 | * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message | |
940 | * @skb: the NETLINK buffer | |
941 | * @info: the Generic NETLINK info block | |
942 | * | |
943 | * Description: | |
944 | * Process a user generated STATICADDDEF message and add a new default | |
945 | * unlabeled connection entry. Returns zero on success, negative values on | |
946 | * failure. | |
947 | * | |
948 | */ | |
949 | static int netlbl_unlabel_staticadddef(struct sk_buff *skb, | |
950 | struct genl_info *info) | |
951 | { | |
952 | int ret_val; | |
953 | void *addr; | |
954 | void *mask; | |
955 | u32 addr_len; | |
956 | u32 secid; | |
13541b3a | 957 | struct netlbl_audit audit_info; |
8cc44579 PM |
958 | |
959 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
960 | * single entry. However, allow users to create two entries, one each | |
961 | * for IPv4 and IPv6, with the same LSM security context which should | |
962 | * achieve the same result. */ | |
963 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
964 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
965 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
966 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
967 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
968 | return -EINVAL; | |
969 | ||
13541b3a PM |
970 | netlbl_netlink_auditinfo(skb, &audit_info); |
971 | ||
8cc44579 PM |
972 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
973 | if (ret_val != 0) | |
974 | return ret_val; | |
975 | ret_val = security_secctx_to_secid( | |
976 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
977 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
978 | &secid); | |
979 | if (ret_val != 0) | |
980 | return ret_val; | |
981 | ||
13541b3a PM |
982 | return netlbl_unlhsh_add(&init_net, |
983 | NULL, addr, mask, addr_len, secid, | |
984 | &audit_info); | |
8cc44579 PM |
985 | } |
986 | ||
987 | /** | |
988 | * netlbl_unlabel_staticremove - Handle a STATICREMOVE message | |
989 | * @skb: the NETLINK buffer | |
990 | * @info: the Generic NETLINK info block | |
991 | * | |
992 | * Description: | |
993 | * Process a user generated STATICREMOVE message and remove the specified | |
994 | * unlabeled connection entry. Returns zero on success, negative values on | |
995 | * failure. | |
996 | * | |
997 | */ | |
998 | static int netlbl_unlabel_staticremove(struct sk_buff *skb, | |
999 | struct genl_info *info) | |
1000 | { | |
1001 | int ret_val; | |
1002 | char *dev_name; | |
1003 | void *addr; | |
1004 | void *mask; | |
1005 | u32 addr_len; | |
13541b3a | 1006 | struct netlbl_audit audit_info; |
8cc44579 PM |
1007 | |
1008 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1009 | * IPv4 and IPv6 in the same entry. */ | |
1010 | if (!info->attrs[NLBL_UNLABEL_A_IFACE] || | |
1011 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1012 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1013 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1014 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1015 | return -EINVAL; | |
1016 | ||
13541b3a PM |
1017 | netlbl_netlink_auditinfo(skb, &audit_info); |
1018 | ||
8cc44579 PM |
1019 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1020 | if (ret_val != 0) | |
1021 | return ret_val; | |
1022 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1023 | ||
13541b3a PM |
1024 | return netlbl_unlhsh_remove(&init_net, |
1025 | dev_name, addr, mask, addr_len, | |
1026 | &audit_info); | |
8cc44579 PM |
1027 | } |
1028 | ||
1029 | /** | |
1030 | * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message | |
1031 | * @skb: the NETLINK buffer | |
1032 | * @info: the Generic NETLINK info block | |
1033 | * | |
1034 | * Description: | |
1035 | * Process a user generated STATICREMOVEDEF message and remove the default | |
1036 | * unlabeled connection entry. Returns zero on success, negative values on | |
1037 | * failure. | |
1038 | * | |
1039 | */ | |
1040 | static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, | |
1041 | struct genl_info *info) | |
1042 | { | |
1043 | int ret_val; | |
1044 | void *addr; | |
1045 | void *mask; | |
1046 | u32 addr_len; | |
13541b3a | 1047 | struct netlbl_audit audit_info; |
8cc44579 PM |
1048 | |
1049 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1050 | * IPv4 and IPv6 in the same entry. */ | |
1051 | if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1052 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1053 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1054 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1055 | return -EINVAL; | |
1056 | ||
13541b3a PM |
1057 | netlbl_netlink_auditinfo(skb, &audit_info); |
1058 | ||
8cc44579 PM |
1059 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1060 | if (ret_val != 0) | |
1061 | return ret_val; | |
1062 | ||
13541b3a PM |
1063 | return netlbl_unlhsh_remove(&init_net, |
1064 | NULL, addr, mask, addr_len, | |
1065 | &audit_info); | |
8cc44579 PM |
1066 | } |
1067 | ||
1068 | ||
1069 | /** | |
1070 | * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] | |
1071 | * @cmd: command/message | |
1072 | * @iface: the interface entry | |
1073 | * @addr4: the IPv4 address entry | |
1074 | * @addr6: the IPv6 address entry | |
1075 | * @arg: the netlbl_unlhsh_walk_arg structure | |
1076 | * | |
1077 | * Description: | |
1078 | * This function is designed to be used to generate a response for a | |
1079 | * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 | |
1080 | * can be specified, not both, the other unspecified entry should be set to | |
1081 | * NULL by the caller. Returns the size of the message on success, negative | |
1082 | * values on failure. | |
1083 | * | |
1084 | */ | |
1085 | static int netlbl_unlabel_staticlist_gen(u32 cmd, | |
1086 | const struct netlbl_unlhsh_iface *iface, | |
1087 | const struct netlbl_unlhsh_addr4 *addr4, | |
1088 | const struct netlbl_unlhsh_addr6 *addr6, | |
1089 | void *arg) | |
1090 | { | |
1091 | int ret_val = -ENOMEM; | |
1092 | struct netlbl_unlhsh_walk_arg *cb_arg = arg; | |
1093 | struct net_device *dev; | |
1094 | void *data; | |
1095 | u32 secid; | |
1096 | char *secctx; | |
1097 | u32 secctx_len; | |
1098 | ||
15e47304 | 1099 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, |
8cc44579 PM |
1100 | cb_arg->seq, &netlbl_unlabel_gnl_family, |
1101 | NLM_F_MULTI, cmd); | |
1102 | if (data == NULL) | |
1103 | goto list_cb_failure; | |
1104 | ||
1105 | if (iface->ifindex > 0) { | |
1106 | dev = dev_get_by_index(&init_net, iface->ifindex); | |
794eb6bf JJ |
1107 | if (!dev) { |
1108 | ret_val = -ENODEV; | |
1109 | goto list_cb_failure; | |
1110 | } | |
8cc44579 PM |
1111 | ret_val = nla_put_string(cb_arg->skb, |
1112 | NLBL_UNLABEL_A_IFACE, dev->name); | |
1113 | dev_put(dev); | |
1114 | if (ret_val != 0) | |
1115 | goto list_cb_failure; | |
1116 | } | |
1117 | ||
1118 | if (addr4) { | |
1119 | struct in_addr addr_struct; | |
1120 | ||
61e10682 | 1121 | addr_struct.s_addr = addr4->list.addr; |
8cc44579 PM |
1122 | ret_val = nla_put(cb_arg->skb, |
1123 | NLBL_UNLABEL_A_IPV4ADDR, | |
1124 | sizeof(struct in_addr), | |
1125 | &addr_struct); | |
1126 | if (ret_val != 0) | |
1127 | goto list_cb_failure; | |
1128 | ||
61e10682 | 1129 | addr_struct.s_addr = addr4->list.mask; |
8cc44579 PM |
1130 | ret_val = nla_put(cb_arg->skb, |
1131 | NLBL_UNLABEL_A_IPV4MASK, | |
1132 | sizeof(struct in_addr), | |
1133 | &addr_struct); | |
1134 | if (ret_val != 0) | |
1135 | goto list_cb_failure; | |
1136 | ||
1137 | secid = addr4->secid; | |
1138 | } else { | |
1139 | ret_val = nla_put(cb_arg->skb, | |
1140 | NLBL_UNLABEL_A_IPV6ADDR, | |
1141 | sizeof(struct in6_addr), | |
61e10682 | 1142 | &addr6->list.addr); |
8cc44579 PM |
1143 | if (ret_val != 0) |
1144 | goto list_cb_failure; | |
1145 | ||
1146 | ret_val = nla_put(cb_arg->skb, | |
1147 | NLBL_UNLABEL_A_IPV6MASK, | |
1148 | sizeof(struct in6_addr), | |
61e10682 | 1149 | &addr6->list.mask); |
8cc44579 PM |
1150 | if (ret_val != 0) |
1151 | goto list_cb_failure; | |
1152 | ||
1153 | secid = addr6->secid; | |
1154 | } | |
1155 | ||
1156 | ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); | |
1157 | if (ret_val != 0) | |
1158 | goto list_cb_failure; | |
1159 | ret_val = nla_put(cb_arg->skb, | |
1160 | NLBL_UNLABEL_A_SECCTX, | |
1161 | secctx_len, | |
1162 | secctx); | |
1163 | security_release_secctx(secctx, secctx_len); | |
1164 | if (ret_val != 0) | |
1165 | goto list_cb_failure; | |
1166 | ||
1167 | cb_arg->seq++; | |
1168 | return genlmsg_end(cb_arg->skb, data); | |
1169 | ||
1170 | list_cb_failure: | |
1171 | genlmsg_cancel(cb_arg->skb, data); | |
1172 | return ret_val; | |
1173 | } | |
1174 | ||
1175 | /** | |
1176 | * netlbl_unlabel_staticlist - Handle a STATICLIST message | |
1177 | * @skb: the NETLINK buffer | |
1178 | * @cb: the NETLINK callback | |
1179 | * | |
1180 | * Description: | |
1181 | * Process a user generated STATICLIST message and dump the unlabeled | |
1182 | * connection hash table in a form suitable for use in a kernel generated | |
1183 | * STATICLIST message. Returns the length of @skb. | |
1184 | * | |
1185 | */ | |
1186 | static int netlbl_unlabel_staticlist(struct sk_buff *skb, | |
1187 | struct netlink_callback *cb) | |
1188 | { | |
1189 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1190 | u32 skip_bkt = cb->args[0]; | |
1191 | u32 skip_chain = cb->args[1]; | |
1192 | u32 skip_addr4 = cb->args[2]; | |
1193 | u32 skip_addr6 = cb->args[3]; | |
1194 | u32 iter_bkt; | |
1195 | u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; | |
1196 | struct netlbl_unlhsh_iface *iface; | |
56196701 | 1197 | struct list_head *iter_list; |
61e10682 | 1198 | struct netlbl_af4list *addr4; |
dfd56b8b | 1199 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1200 | struct netlbl_af6list *addr6; |
1201 | #endif | |
8cc44579 PM |
1202 | |
1203 | cb_arg.nl_cb = cb; | |
1204 | cb_arg.skb = skb; | |
1205 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1206 | ||
1207 | rcu_read_lock(); | |
1208 | for (iter_bkt = skip_bkt; | |
1209 | iter_bkt < rcu_dereference(netlbl_unlhsh)->size; | |
1210 | iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) { | |
56196701 PM |
1211 | iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; |
1212 | list_for_each_entry_rcu(iface, iter_list, list) { | |
8cc44579 PM |
1213 | if (!iface->valid || |
1214 | iter_chain++ < skip_chain) | |
1215 | continue; | |
61e10682 PM |
1216 | netlbl_af4list_foreach_rcu(addr4, |
1217 | &iface->addr4_list) { | |
1218 | if (iter_addr4++ < skip_addr4) | |
8cc44579 PM |
1219 | continue; |
1220 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1221 | NLBL_UNLABEL_C_STATICLIST, |
1222 | iface, | |
1223 | netlbl_unlhsh_addr4_entry(addr4), | |
1224 | NULL, | |
1225 | &cb_arg) < 0) { | |
8cc44579 PM |
1226 | iter_addr4--; |
1227 | iter_chain--; | |
1228 | goto unlabel_staticlist_return; | |
1229 | } | |
1230 | } | |
dfd56b8b | 1231 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1232 | netlbl_af6list_foreach_rcu(addr6, |
1233 | &iface->addr6_list) { | |
1234 | if (iter_addr6++ < skip_addr6) | |
8cc44579 PM |
1235 | continue; |
1236 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1237 | NLBL_UNLABEL_C_STATICLIST, |
1238 | iface, | |
1239 | NULL, | |
1240 | netlbl_unlhsh_addr6_entry(addr6), | |
1241 | &cb_arg) < 0) { | |
8cc44579 PM |
1242 | iter_addr6--; |
1243 | iter_chain--; | |
1244 | goto unlabel_staticlist_return; | |
1245 | } | |
1246 | } | |
61e10682 | 1247 | #endif /* IPv6 */ |
8cc44579 PM |
1248 | } |
1249 | } | |
1250 | ||
1251 | unlabel_staticlist_return: | |
1252 | rcu_read_unlock(); | |
1253 | cb->args[0] = skip_bkt; | |
1254 | cb->args[1] = skip_chain; | |
1255 | cb->args[2] = skip_addr4; | |
1256 | cb->args[3] = skip_addr6; | |
1257 | return skb->len; | |
1258 | } | |
1259 | ||
1260 | /** | |
1261 | * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message | |
1262 | * @skb: the NETLINK buffer | |
1263 | * @cb: the NETLINK callback | |
1264 | * | |
1265 | * Description: | |
1266 | * Process a user generated STATICLISTDEF message and dump the default | |
1267 | * unlabeled connection entry in a form suitable for use in a kernel generated | |
1268 | * STATICLISTDEF message. Returns the length of @skb. | |
1269 | * | |
1270 | */ | |
1271 | static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, | |
1272 | struct netlink_callback *cb) | |
1273 | { | |
1274 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1275 | struct netlbl_unlhsh_iface *iface; | |
1276 | u32 skip_addr4 = cb->args[0]; | |
1277 | u32 skip_addr6 = cb->args[1]; | |
61e10682 PM |
1278 | u32 iter_addr4 = 0; |
1279 | struct netlbl_af4list *addr4; | |
dfd56b8b | 1280 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1281 | u32 iter_addr6 = 0; |
1282 | struct netlbl_af6list *addr6; | |
1283 | #endif | |
8cc44579 PM |
1284 | |
1285 | cb_arg.nl_cb = cb; | |
1286 | cb_arg.skb = skb; | |
1287 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1288 | ||
1289 | rcu_read_lock(); | |
1290 | iface = rcu_dereference(netlbl_unlhsh_def); | |
1291 | if (iface == NULL || !iface->valid) | |
1292 | goto unlabel_staticlistdef_return; | |
1293 | ||
61e10682 PM |
1294 | netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
1295 | if (iter_addr4++ < skip_addr4) | |
8cc44579 PM |
1296 | continue; |
1297 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1298 | iface, |
1299 | netlbl_unlhsh_addr4_entry(addr4), | |
1300 | NULL, | |
1301 | &cb_arg) < 0) { | |
8cc44579 PM |
1302 | iter_addr4--; |
1303 | goto unlabel_staticlistdef_return; | |
1304 | } | |
1305 | } | |
dfd56b8b | 1306 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1307 | netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { |
1308 | if (iter_addr6++ < skip_addr6) | |
8cc44579 PM |
1309 | continue; |
1310 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1311 | iface, |
1312 | NULL, | |
1313 | netlbl_unlhsh_addr6_entry(addr6), | |
1314 | &cb_arg) < 0) { | |
8cc44579 PM |
1315 | iter_addr6--; |
1316 | goto unlabel_staticlistdef_return; | |
1317 | } | |
1318 | } | |
61e10682 | 1319 | #endif /* IPv6 */ |
8cc44579 PM |
1320 | |
1321 | unlabel_staticlistdef_return: | |
1322 | rcu_read_unlock(); | |
1323 | cb->args[0] = skip_addr4; | |
1324 | cb->args[1] = skip_addr6; | |
1325 | return skb->len; | |
1326 | } | |
96cb8e33 PM |
1327 | |
1328 | /* | |
1329 | * NetLabel Generic NETLINK Command Definitions | |
1330 | */ | |
1331 | ||
227c43c3 PE |
1332 | static struct genl_ops netlbl_unlabel_genl_ops[] = { |
1333 | { | |
8cc44579 PM |
1334 | .cmd = NLBL_UNLABEL_C_STATICADD, |
1335 | .flags = GENL_ADMIN_PERM, | |
1336 | .policy = netlbl_unlabel_genl_policy, | |
1337 | .doit = netlbl_unlabel_staticadd, | |
1338 | .dumpit = NULL, | |
227c43c3 PE |
1339 | }, |
1340 | { | |
8cc44579 PM |
1341 | .cmd = NLBL_UNLABEL_C_STATICREMOVE, |
1342 | .flags = GENL_ADMIN_PERM, | |
1343 | .policy = netlbl_unlabel_genl_policy, | |
1344 | .doit = netlbl_unlabel_staticremove, | |
1345 | .dumpit = NULL, | |
227c43c3 PE |
1346 | }, |
1347 | { | |
8cc44579 PM |
1348 | .cmd = NLBL_UNLABEL_C_STATICLIST, |
1349 | .flags = 0, | |
1350 | .policy = netlbl_unlabel_genl_policy, | |
1351 | .doit = NULL, | |
1352 | .dumpit = netlbl_unlabel_staticlist, | |
227c43c3 PE |
1353 | }, |
1354 | { | |
8cc44579 PM |
1355 | .cmd = NLBL_UNLABEL_C_STATICADDDEF, |
1356 | .flags = GENL_ADMIN_PERM, | |
1357 | .policy = netlbl_unlabel_genl_policy, | |
1358 | .doit = netlbl_unlabel_staticadddef, | |
1359 | .dumpit = NULL, | |
227c43c3 PE |
1360 | }, |
1361 | { | |
8cc44579 PM |
1362 | .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, |
1363 | .flags = GENL_ADMIN_PERM, | |
1364 | .policy = netlbl_unlabel_genl_policy, | |
1365 | .doit = netlbl_unlabel_staticremovedef, | |
1366 | .dumpit = NULL, | |
227c43c3 PE |
1367 | }, |
1368 | { | |
8cc44579 PM |
1369 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
1370 | .flags = 0, | |
1371 | .policy = netlbl_unlabel_genl_policy, | |
1372 | .doit = NULL, | |
1373 | .dumpit = netlbl_unlabel_staticlistdef, | |
227c43c3 PE |
1374 | }, |
1375 | { | |
96cb8e33 | 1376 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
fd385855 PM |
1377 | .flags = GENL_ADMIN_PERM, |
1378 | .policy = netlbl_unlabel_genl_policy, | |
96cb8e33 PM |
1379 | .doit = netlbl_unlabel_accept, |
1380 | .dumpit = NULL, | |
227c43c3 PE |
1381 | }, |
1382 | { | |
96cb8e33 PM |
1383 | .cmd = NLBL_UNLABEL_C_LIST, |
1384 | .flags = 0, | |
fd385855 | 1385 | .policy = netlbl_unlabel_genl_policy, |
96cb8e33 PM |
1386 | .doit = netlbl_unlabel_list, |
1387 | .dumpit = NULL, | |
227c43c3 | 1388 | }, |
96cb8e33 PM |
1389 | }; |
1390 | ||
96cb8e33 PM |
1391 | /* |
1392 | * NetLabel Generic NETLINK Protocol Functions | |
1393 | */ | |
1394 | ||
1395 | /** | |
1396 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
1397 | * | |
1398 | * Description: | |
1399 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
1400 | * mechanism. Returns zero on success, negative values on failure. | |
1401 | * | |
1402 | */ | |
05705e4e | 1403 | int __init netlbl_unlabel_genl_init(void) |
96cb8e33 | 1404 | { |
7ae740df MM |
1405 | return genl_register_family_with_ops(&netlbl_unlabel_gnl_family, |
1406 | netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops)); | |
96cb8e33 PM |
1407 | } |
1408 | ||
1409 | /* | |
1410 | * NetLabel KAPI Hooks | |
1411 | */ | |
1412 | ||
8cc44579 PM |
1413 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1414 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1415 | }; | |
1416 | ||
1417 | /** | |
1418 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1419 | * @size: the number of bits to use for the hash buckets | |
1420 | * | |
1421 | * Description: | |
1422 | * Initializes the unlabeled connection hash table and registers a network | |
1423 | * device notification handler. This function should only be called by the | |
1424 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1425 | * non-zero values on error. | |
1426 | * | |
1427 | */ | |
05705e4e | 1428 | int __init netlbl_unlabel_init(u32 size) |
8cc44579 PM |
1429 | { |
1430 | u32 iter; | |
1431 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1432 | ||
1433 | if (size == 0) | |
1434 | return -EINVAL; | |
1435 | ||
1436 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1437 | if (hsh_tbl == NULL) | |
1438 | return -ENOMEM; | |
1439 | hsh_tbl->size = 1 << size; | |
1440 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1441 | sizeof(struct list_head), | |
1442 | GFP_KERNEL); | |
1443 | if (hsh_tbl->tbl == NULL) { | |
1444 | kfree(hsh_tbl); | |
1445 | return -ENOMEM; | |
1446 | } | |
1447 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1448 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1449 | ||
8cc44579 | 1450 | spin_lock(&netlbl_unlhsh_lock); |
cf778b00 | 1451 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); |
8cc44579 | 1452 | spin_unlock(&netlbl_unlhsh_lock); |
8cc44579 PM |
1453 | |
1454 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1455 | ||
1456 | return 0; | |
1457 | } | |
1458 | ||
96cb8e33 PM |
1459 | /** |
1460 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1461 | * @skb: the packet |
1462 | * @family: protocol family | |
96cb8e33 PM |
1463 | * @secattr: the security attributes |
1464 | * | |
1465 | * Description: | |
1466 | * Determine the security attributes, if any, for an unlabled packet and return | |
1467 | * them in @secattr. Returns zero on success and negative values on failure. | |
1468 | * | |
1469 | */ | |
8cc44579 PM |
1470 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1471 | u16 family, | |
1472 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1473 | { |
8cc44579 PM |
1474 | struct netlbl_unlhsh_iface *iface; |
1475 | ||
1476 | rcu_read_lock(); | |
b914f3a2 | 1477 | iface = netlbl_unlhsh_search_iface(skb->skb_iif); |
8cc44579 | 1478 | if (iface == NULL) |
b914f3a2 PM |
1479 | iface = rcu_dereference(netlbl_unlhsh_def); |
1480 | if (iface == NULL || !iface->valid) | |
8cc44579 PM |
1481 | goto unlabel_getattr_nolabel; |
1482 | switch (family) { | |
56628b1d PE |
1483 | case PF_INET: { |
1484 | struct iphdr *hdr4; | |
61e10682 | 1485 | struct netlbl_af4list *addr4; |
56628b1d | 1486 | |
8cc44579 | 1487 | hdr4 = ip_hdr(skb); |
61e10682 PM |
1488 | addr4 = netlbl_af4list_search(hdr4->saddr, |
1489 | &iface->addr4_list); | |
8cc44579 PM |
1490 | if (addr4 == NULL) |
1491 | goto unlabel_getattr_nolabel; | |
61e10682 | 1492 | secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
8cc44579 | 1493 | break; |
56628b1d | 1494 | } |
dfd56b8b | 1495 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d PE |
1496 | case PF_INET6: { |
1497 | struct ipv6hdr *hdr6; | |
61e10682 | 1498 | struct netlbl_af6list *addr6; |
56628b1d | 1499 | |
8cc44579 | 1500 | hdr6 = ipv6_hdr(skb); |
61e10682 PM |
1501 | addr6 = netlbl_af6list_search(&hdr6->saddr, |
1502 | &iface->addr6_list); | |
8cc44579 PM |
1503 | if (addr6 == NULL) |
1504 | goto unlabel_getattr_nolabel; | |
61e10682 | 1505 | secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; |
8cc44579 | 1506 | break; |
56628b1d | 1507 | } |
8cc44579 PM |
1508 | #endif /* IPv6 */ |
1509 | default: | |
1510 | goto unlabel_getattr_nolabel; | |
1511 | } | |
1512 | rcu_read_unlock(); | |
1513 | ||
1514 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1515 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1516 | return 0; | |
1517 | ||
1518 | unlabel_getattr_nolabel: | |
1519 | rcu_read_unlock(); | |
c783f1ce PM |
1520 | if (netlabel_unlabel_acceptflg == 0) |
1521 | return -ENOMSG; | |
16efd454 | 1522 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1523 | return 0; |
96cb8e33 PM |
1524 | } |
1525 | ||
1526 | /** | |
1527 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1528 | * | |
1529 | * Description: | |
1530 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1531 | * and to send unlabeled network traffic by default. | |
1532 | * | |
1533 | */ | |
05705e4e | 1534 | int __init netlbl_unlabel_defconf(void) |
96cb8e33 PM |
1535 | { |
1536 | int ret_val; | |
1537 | struct netlbl_dom_map *entry; | |
95d4e6be | 1538 | struct netlbl_audit audit_info; |
32f50cde | 1539 | |
95d4e6be PM |
1540 | /* Only the kernel is allowed to call this function and the only time |
1541 | * it is called is at bootup before the audit subsystem is reporting | |
1542 | * messages so don't worry to much about these values. */ | |
1543 | security_task_getsecid(current, &audit_info.secid); | |
e1760bd5 | 1544 | audit_info.loginuid = GLOBAL_ROOT_UID; |
2532386f | 1545 | audit_info.sessionid = 0; |
96cb8e33 PM |
1546 | |
1547 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1548 | if (entry == NULL) | |
1549 | return -ENOMEM; | |
1550 | entry->type = NETLBL_NLTYPE_UNLABELED; | |
95d4e6be | 1551 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1552 | if (ret_val != 0) |
1553 | return ret_val; | |
1554 | ||
95d4e6be | 1555 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1556 | |
1557 | return 0; | |
1558 | } |