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96cb8e33 PM |
1 | /* |
2 | * NetLabel Unlabeled Support | |
3 | * | |
4 | * This file defines functions for dealing with unlabeled packets for the | |
5 | * NetLabel system. The NetLabel system manages static and dynamic label | |
6 | * mappings for network protocols such as CIPSO and RIPSO. | |
7 | * | |
8 | * Author: Paul Moore <paul.moore@hp.com> | |
9 | * | |
10 | */ | |
11 | ||
12 | /* | |
61e10682 | 13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008 |
96cb8e33 PM |
14 | * |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
23 | * the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <linux/types.h> | |
8cc44579 | 32 | #include <linux/rcupdate.h> |
96cb8e33 PM |
33 | #include <linux/list.h> |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/skbuff.h> | |
de64688f | 38 | #include <linux/audit.h> |
8cc44579 PM |
39 | #include <linux/in.h> |
40 | #include <linux/in6.h> | |
41 | #include <linux/ip.h> | |
42 | #include <linux/ipv6.h> | |
43 | #include <linux/notifier.h> | |
44 | #include <linux/netdevice.h> | |
45 | #include <linux/security.h> | |
5a0e3ad6 | 46 | #include <linux/slab.h> |
96cb8e33 PM |
47 | #include <net/sock.h> |
48 | #include <net/netlink.h> | |
49 | #include <net/genetlink.h> | |
8cc44579 PM |
50 | #include <net/ip.h> |
51 | #include <net/ipv6.h> | |
52 | #include <net/net_namespace.h> | |
96cb8e33 PM |
53 | #include <net/netlabel.h> |
54 | #include <asm/bug.h> | |
8cc44579 | 55 | #include <asm/atomic.h> |
96cb8e33 PM |
56 | |
57 | #include "netlabel_user.h" | |
61e10682 | 58 | #include "netlabel_addrlist.h" |
96cb8e33 PM |
59 | #include "netlabel_domainhash.h" |
60 | #include "netlabel_unlabeled.h" | |
8cc44579 PM |
61 | #include "netlabel_mgmt.h" |
62 | ||
63 | /* NOTE: at present we always use init's network namespace since we don't | |
64 | * presently support different namespaces even though the majority of | |
65 | * the functions in this file are "namespace safe" */ | |
66 | ||
67 | /* The unlabeled connection hash table which we use to map network interfaces | |
68 | * and addresses of unlabeled packets to a user specified secid value for the | |
69 | * LSM. The hash table is used to lookup the network interface entry | |
70 | * (struct netlbl_unlhsh_iface) and then the interface entry is used to | |
71 | * lookup an IP address match from an ordered list. If a network interface | |
72 | * match can not be found in the hash table then the default entry | |
73 | * (netlbl_unlhsh_def) is used. The IP address entry list | |
74 | * (struct netlbl_unlhsh_addr) is ordered such that the entries with a | |
75 | * larger netmask come first. | |
76 | */ | |
77 | struct netlbl_unlhsh_tbl { | |
78 | struct list_head *tbl; | |
79 | u32 size; | |
80 | }; | |
61e10682 PM |
81 | #define netlbl_unlhsh_addr4_entry(iter) \ |
82 | container_of(iter, struct netlbl_unlhsh_addr4, list) | |
8cc44579 | 83 | struct netlbl_unlhsh_addr4 { |
8cc44579 PM |
84 | u32 secid; |
85 | ||
61e10682 | 86 | struct netlbl_af4list list; |
8cc44579 PM |
87 | struct rcu_head rcu; |
88 | }; | |
61e10682 PM |
89 | #define netlbl_unlhsh_addr6_entry(iter) \ |
90 | container_of(iter, struct netlbl_unlhsh_addr6, list) | |
8cc44579 | 91 | struct netlbl_unlhsh_addr6 { |
8cc44579 PM |
92 | u32 secid; |
93 | ||
61e10682 | 94 | struct netlbl_af6list list; |
8cc44579 PM |
95 | struct rcu_head rcu; |
96 | }; | |
97 | struct netlbl_unlhsh_iface { | |
98 | int ifindex; | |
99 | struct list_head addr4_list; | |
100 | struct list_head addr6_list; | |
101 | ||
102 | u32 valid; | |
103 | struct list_head list; | |
104 | struct rcu_head rcu; | |
105 | }; | |
106 | ||
107 | /* Argument struct for netlbl_unlhsh_walk() */ | |
108 | struct netlbl_unlhsh_walk_arg { | |
109 | struct netlink_callback *nl_cb; | |
110 | struct sk_buff *skb; | |
111 | u32 seq; | |
112 | }; | |
113 | ||
114 | /* Unlabeled connection hash table */ | |
115 | /* updates should be so rare that having one spinlock for the entire | |
116 | * hash table should be okay */ | |
117 | static DEFINE_SPINLOCK(netlbl_unlhsh_lock); | |
b914f3a2 PM |
118 | #define netlbl_unlhsh_rcu_deref(p) \ |
119 | rcu_dereference_check(p, rcu_read_lock_held() || \ | |
120 | lockdep_is_held(&netlbl_unlhsh_lock)) | |
8cc44579 PM |
121 | static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL; |
122 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL; | |
96cb8e33 PM |
123 | |
124 | /* Accept unlabeled packets flag */ | |
cd28786d | 125 | static u8 netlabel_unlabel_acceptflg = 0; |
96cb8e33 | 126 | |
8cc44579 | 127 | /* NetLabel Generic NETLINK unlabeled family */ |
96cb8e33 PM |
128 | static struct genl_family netlbl_unlabel_gnl_family = { |
129 | .id = GENL_ID_GENERATE, | |
130 | .hdrsize = 0, | |
131 | .name = NETLBL_NLTYPE_UNLABELED_NAME, | |
132 | .version = NETLBL_PROTO_VERSION, | |
fd385855 | 133 | .maxattr = NLBL_UNLABEL_A_MAX, |
96cb8e33 PM |
134 | }; |
135 | ||
fd385855 | 136 | /* NetLabel Netlink attribute policy */ |
ef7c79ed | 137 | static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
fd385855 | 138 | [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
8cc44579 PM |
139 | [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY, |
140 | .len = sizeof(struct in6_addr) }, | |
141 | [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY, | |
142 | .len = sizeof(struct in6_addr) }, | |
143 | [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY, | |
144 | .len = sizeof(struct in_addr) }, | |
145 | [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY, | |
146 | .len = sizeof(struct in_addr) }, | |
147 | [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING, | |
148 | .len = IFNAMSIZ - 1 }, | |
149 | [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY } | |
fd385855 | 150 | }; |
96cb8e33 | 151 | |
32f50cde | 152 | /* |
8cc44579 PM |
153 | * Unlabeled Connection Hash Table Functions |
154 | */ | |
155 | ||
156 | /** | |
157 | * netlbl_unlhsh_free_addr4 - Frees an IPv4 address entry from the hash table | |
158 | * @entry: the entry's RCU field | |
159 | * | |
160 | * Description: | |
161 | * This function is designed to be used as a callback to the call_rcu() | |
162 | * function so that memory allocated to a hash table address entry can be | |
163 | * released safely. | |
164 | * | |
165 | */ | |
166 | static void netlbl_unlhsh_free_addr4(struct rcu_head *entry) | |
167 | { | |
168 | struct netlbl_unlhsh_addr4 *ptr; | |
169 | ||
170 | ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu); | |
171 | kfree(ptr); | |
172 | } | |
173 | ||
174 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
175 | /** | |
176 | * netlbl_unlhsh_free_addr6 - Frees an IPv6 address entry from the hash table | |
177 | * @entry: the entry's RCU field | |
178 | * | |
179 | * Description: | |
180 | * This function is designed to be used as a callback to the call_rcu() | |
181 | * function so that memory allocated to a hash table address entry can be | |
182 | * released safely. | |
183 | * | |
184 | */ | |
185 | static void netlbl_unlhsh_free_addr6(struct rcu_head *entry) | |
186 | { | |
187 | struct netlbl_unlhsh_addr6 *ptr; | |
188 | ||
189 | ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu); | |
190 | kfree(ptr); | |
191 | } | |
192 | #endif /* IPv6 */ | |
193 | ||
194 | /** | |
195 | * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table | |
196 | * @entry: the entry's RCU field | |
197 | * | |
198 | * Description: | |
199 | * This function is designed to be used as a callback to the call_rcu() | |
200 | * function so that memory allocated to a hash table interface entry can be | |
201 | * released safely. It is important to note that this function does not free | |
202 | * the IPv4 and IPv6 address lists contained as part of an interface entry. It | |
203 | * is up to the rest of the code to make sure an interface entry is only freed | |
204 | * once it's address lists are empty. | |
205 | * | |
206 | */ | |
207 | static void netlbl_unlhsh_free_iface(struct rcu_head *entry) | |
208 | { | |
209 | struct netlbl_unlhsh_iface *iface; | |
61e10682 PM |
210 | struct netlbl_af4list *iter4; |
211 | struct netlbl_af4list *tmp4; | |
212 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
213 | struct netlbl_af6list *iter6; | |
214 | struct netlbl_af6list *tmp6; | |
215 | #endif /* IPv6 */ | |
8cc44579 PM |
216 | |
217 | iface = container_of(entry, struct netlbl_unlhsh_iface, rcu); | |
218 | ||
219 | /* no need for locks here since we are the only one with access to this | |
220 | * structure */ | |
221 | ||
61e10682 PM |
222 | netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) { |
223 | netlbl_af4list_remove_entry(iter4); | |
224 | kfree(netlbl_unlhsh_addr4_entry(iter4)); | |
225 | } | |
226 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
227 | netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) { | |
228 | netlbl_af6list_remove_entry(iter6); | |
229 | kfree(netlbl_unlhsh_addr6_entry(iter6)); | |
230 | } | |
231 | #endif /* IPv6 */ | |
8cc44579 PM |
232 | kfree(iface); |
233 | } | |
234 | ||
235 | /** | |
236 | * netlbl_unlhsh_hash - Hashing function for the hash table | |
237 | * @ifindex: the network interface/device to hash | |
238 | * | |
239 | * Description: | |
240 | * This is the hashing function for the unlabeled hash table, it returns the | |
241 | * bucket number for the given device/interface. The caller is responsible for | |
b914f3a2 PM |
242 | * ensuring that the hash table is protected with either a RCU read lock or |
243 | * the hash table lock. | |
8cc44579 PM |
244 | * |
245 | */ | |
246 | static u32 netlbl_unlhsh_hash(int ifindex) | |
247 | { | |
b914f3a2 | 248 | return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1); |
8cc44579 PM |
249 | } |
250 | ||
8cc44579 PM |
251 | /** |
252 | * netlbl_unlhsh_search_iface - Search for a matching interface entry | |
253 | * @ifindex: the network interface | |
254 | * | |
255 | * Description: | |
256 | * Searches the unlabeled connection hash table and returns a pointer to the | |
257 | * interface entry which matches @ifindex, otherwise NULL is returned. The | |
b914f3a2 PM |
258 | * caller is responsible for ensuring that the hash table is protected with |
259 | * either a RCU read lock or the hash table lock. | |
8cc44579 PM |
260 | * |
261 | */ | |
262 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex) | |
263 | { | |
264 | u32 bkt; | |
56196701 | 265 | struct list_head *bkt_list; |
8cc44579 PM |
266 | struct netlbl_unlhsh_iface *iter; |
267 | ||
268 | bkt = netlbl_unlhsh_hash(ifindex); | |
b914f3a2 | 269 | bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]; |
56196701 | 270 | list_for_each_entry_rcu(iter, bkt_list, list) |
8cc44579 PM |
271 | if (iter->valid && iter->ifindex == ifindex) |
272 | return iter; | |
273 | ||
274 | return NULL; | |
275 | } | |
276 | ||
8cc44579 PM |
277 | /** |
278 | * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table | |
279 | * @iface: the associated interface entry | |
280 | * @addr: IPv4 address in network byte order | |
281 | * @mask: IPv4 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 | 288 | * |
32f50cde | 289 | */ |
8cc44579 PM |
290 | static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, |
291 | const struct in_addr *addr, | |
292 | const struct in_addr *mask, | |
293 | u32 secid) | |
294 | { | |
61e10682 | 295 | int ret_val; |
8cc44579 | 296 | struct netlbl_unlhsh_addr4 *entry; |
8cc44579 PM |
297 | |
298 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
299 | if (entry == NULL) | |
300 | return -ENOMEM; | |
301 | ||
61e10682 PM |
302 | entry->list.addr = addr->s_addr & mask->s_addr; |
303 | entry->list.mask = mask->s_addr; | |
304 | entry->list.valid = 1; | |
61e10682 | 305 | entry->secid = secid; |
8cc44579 PM |
306 | |
307 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 308 | ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); |
8cc44579 | 309 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
310 | |
311 | if (ret_val != 0) | |
312 | kfree(entry); | |
313 | return ret_val; | |
8cc44579 PM |
314 | } |
315 | ||
316 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
317 | /** | |
318 | * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table | |
319 | * @iface: the associated interface entry | |
320 | * @addr: IPv6 address in network byte order | |
321 | * @mask: IPv6 address mask in network byte order | |
322 | * @secid: LSM secid value for entry | |
323 | * | |
324 | * Description: | |
325 | * Add a new address entry into the unlabeled connection hash table using the | |
326 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 327 | * a negative value is returned. |
8cc44579 PM |
328 | * |
329 | */ | |
330 | static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, | |
331 | const struct in6_addr *addr, | |
332 | const struct in6_addr *mask, | |
333 | u32 secid) | |
334 | { | |
61e10682 | 335 | int ret_val; |
8cc44579 | 336 | struct netlbl_unlhsh_addr6 *entry; |
8cc44579 PM |
337 | |
338 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
339 | if (entry == NULL) | |
340 | return -ENOMEM; | |
341 | ||
61e10682 PM |
342 | ipv6_addr_copy(&entry->list.addr, addr); |
343 | entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; | |
344 | entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; | |
345 | entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; | |
346 | entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; | |
347 | ipv6_addr_copy(&entry->list.mask, mask); | |
348 | entry->list.valid = 1; | |
61e10682 | 349 | entry->secid = secid; |
8cc44579 PM |
350 | |
351 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 352 | ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); |
8cc44579 | 353 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
354 | |
355 | if (ret_val != 0) | |
356 | kfree(entry); | |
8cc44579 PM |
357 | return 0; |
358 | } | |
359 | #endif /* IPv6 */ | |
360 | ||
361 | /** | |
362 | * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table | |
363 | * @ifindex: network interface | |
364 | * | |
365 | * Description: | |
366 | * Add a new, empty, interface entry into the unlabeled connection hash table. | |
367 | * On success a pointer to the new interface entry is returned, on failure NULL | |
b914f3a2 | 368 | * is returned. |
8cc44579 PM |
369 | * |
370 | */ | |
371 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) | |
372 | { | |
373 | u32 bkt; | |
374 | struct netlbl_unlhsh_iface *iface; | |
375 | ||
376 | iface = kzalloc(sizeof(*iface), GFP_ATOMIC); | |
377 | if (iface == NULL) | |
378 | return NULL; | |
379 | ||
380 | iface->ifindex = ifindex; | |
381 | INIT_LIST_HEAD(&iface->addr4_list); | |
382 | INIT_LIST_HEAD(&iface->addr6_list); | |
383 | iface->valid = 1; | |
8cc44579 PM |
384 | |
385 | spin_lock(&netlbl_unlhsh_lock); | |
386 | if (ifindex > 0) { | |
387 | bkt = netlbl_unlhsh_hash(ifindex); | |
388 | if (netlbl_unlhsh_search_iface(ifindex) != NULL) | |
389 | goto add_iface_failure; | |
390 | list_add_tail_rcu(&iface->list, | |
b914f3a2 | 391 | &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]); |
8cc44579 PM |
392 | } else { |
393 | INIT_LIST_HEAD(&iface->list); | |
b914f3a2 | 394 | if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL) |
8cc44579 PM |
395 | goto add_iface_failure; |
396 | rcu_assign_pointer(netlbl_unlhsh_def, iface); | |
397 | } | |
398 | spin_unlock(&netlbl_unlhsh_lock); | |
399 | ||
400 | return iface; | |
401 | ||
402 | add_iface_failure: | |
403 | spin_unlock(&netlbl_unlhsh_lock); | |
404 | kfree(iface); | |
405 | return NULL; | |
406 | } | |
407 | ||
408 | /** | |
409 | * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table | |
410 | * @net: network namespace | |
411 | * @dev_name: interface name | |
412 | * @addr: IP address in network byte order | |
413 | * @mask: address mask in network byte order | |
414 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
415 | * @secid: LSM secid value for the entry | |
13541b3a | 416 | * @audit_info: NetLabel audit information |
8cc44579 PM |
417 | * |
418 | * Description: | |
419 | * Adds a new entry to the unlabeled connection hash table. Returns zero on | |
420 | * success, negative values on failure. | |
421 | * | |
422 | */ | |
6c2e8ac0 PM |
423 | int netlbl_unlhsh_add(struct net *net, |
424 | const char *dev_name, | |
425 | const void *addr, | |
426 | const void *mask, | |
427 | u32 addr_len, | |
428 | u32 secid, | |
429 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
430 | { |
431 | int ret_val; | |
432 | int ifindex; | |
433 | struct net_device *dev; | |
434 | struct netlbl_unlhsh_iface *iface; | |
13541b3a PM |
435 | struct audit_buffer *audit_buf = NULL; |
436 | char *secctx = NULL; | |
437 | u32 secctx_len; | |
8cc44579 PM |
438 | |
439 | if (addr_len != sizeof(struct in_addr) && | |
440 | addr_len != sizeof(struct in6_addr)) | |
441 | return -EINVAL; | |
442 | ||
443 | rcu_read_lock(); | |
444 | if (dev_name != NULL) { | |
122ec6ff | 445 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
446 | if (dev == NULL) { |
447 | ret_val = -ENODEV; | |
448 | goto unlhsh_add_return; | |
449 | } | |
450 | ifindex = dev->ifindex; | |
8cc44579 PM |
451 | iface = netlbl_unlhsh_search_iface(ifindex); |
452 | } else { | |
453 | ifindex = 0; | |
454 | iface = rcu_dereference(netlbl_unlhsh_def); | |
455 | } | |
456 | if (iface == NULL) { | |
457 | iface = netlbl_unlhsh_add_iface(ifindex); | |
458 | if (iface == NULL) { | |
459 | ret_val = -ENOMEM; | |
460 | goto unlhsh_add_return; | |
461 | } | |
462 | } | |
13541b3a PM |
463 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, |
464 | audit_info); | |
8cc44579 | 465 | switch (addr_len) { |
56628b1d PE |
466 | case sizeof(struct in_addr): { |
467 | struct in_addr *addr4, *mask4; | |
468 | ||
13541b3a PM |
469 | addr4 = (struct in_addr *)addr; |
470 | mask4 = (struct in_addr *)mask; | |
471 | ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); | |
472 | if (audit_buf != NULL) | |
63c41688 PM |
473 | netlbl_af4list_audit_addr(audit_buf, 1, |
474 | dev_name, | |
475 | addr4->s_addr, | |
476 | mask4->s_addr); | |
8cc44579 | 477 | break; |
56628b1d | 478 | } |
8cc44579 | 479 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
56628b1d PE |
480 | case sizeof(struct in6_addr): { |
481 | struct in6_addr *addr6, *mask6; | |
482 | ||
13541b3a PM |
483 | addr6 = (struct in6_addr *)addr; |
484 | mask6 = (struct in6_addr *)mask; | |
485 | ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); | |
486 | if (audit_buf != NULL) | |
63c41688 PM |
487 | netlbl_af6list_audit_addr(audit_buf, 1, |
488 | dev_name, | |
489 | addr6, mask6); | |
8cc44579 | 490 | break; |
56628b1d | 491 | } |
8cc44579 PM |
492 | #endif /* IPv6 */ |
493 | default: | |
494 | ret_val = -EINVAL; | |
495 | } | |
496 | if (ret_val == 0) | |
497 | atomic_inc(&netlabel_mgmt_protocount); | |
498 | ||
499 | unlhsh_add_return: | |
500 | rcu_read_unlock(); | |
13541b3a PM |
501 | if (audit_buf != NULL) { |
502 | if (security_secid_to_secctx(secid, | |
503 | &secctx, | |
504 | &secctx_len) == 0) { | |
505 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
506 | security_release_secctx(secctx, secctx_len); | |
507 | } | |
508 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
509 | audit_log_end(audit_buf); | |
510 | } | |
8cc44579 PM |
511 | return ret_val; |
512 | } | |
513 | ||
514 | /** | |
515 | * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry | |
13541b3a | 516 | * @net: network namespace |
8cc44579 PM |
517 | * @iface: interface entry |
518 | * @addr: IP address | |
519 | * @mask: IP address mask | |
13541b3a | 520 | * @audit_info: NetLabel audit information |
8cc44579 PM |
521 | * |
522 | * Description: | |
523 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 524 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
525 | * |
526 | */ | |
13541b3a PM |
527 | static int netlbl_unlhsh_remove_addr4(struct net *net, |
528 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 529 | const struct in_addr *addr, |
13541b3a PM |
530 | const struct in_addr *mask, |
531 | struct netlbl_audit *audit_info) | |
8cc44579 | 532 | { |
61e10682 | 533 | struct netlbl_af4list *list_entry; |
8cc44579 | 534 | struct netlbl_unlhsh_addr4 *entry; |
61e10682 | 535 | struct audit_buffer *audit_buf; |
13541b3a | 536 | struct net_device *dev; |
61e10682 | 537 | char *secctx; |
13541b3a | 538 | u32 secctx_len; |
8cc44579 PM |
539 | |
540 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
541 | list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, |
542 | &iface->addr4_list); | |
8cc44579 | 543 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
544 | if (list_entry != NULL) |
545 | entry = netlbl_unlhsh_addr4_entry(list_entry); | |
546 | else | |
ec8f2375 | 547 | entry = NULL; |
8cc44579 | 548 | |
13541b3a PM |
549 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
550 | audit_info); | |
551 | if (audit_buf != NULL) { | |
552 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
553 | netlbl_af4list_audit_addr(audit_buf, 1, |
554 | (dev != NULL ? dev->name : NULL), | |
555 | addr->s_addr, mask->s_addr); | |
13541b3a PM |
556 | if (dev != NULL) |
557 | dev_put(dev); | |
ec8f2375 PM |
558 | if (entry != NULL && |
559 | security_secid_to_secctx(entry->secid, | |
560 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
561 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
562 | security_release_secctx(secctx, secctx_len); | |
563 | } | |
ec8f2375 | 564 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
565 | audit_log_end(audit_buf); |
566 | } | |
567 | ||
ec8f2375 PM |
568 | if (entry == NULL) |
569 | return -ENOENT; | |
570 | ||
571 | call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4); | |
572 | return 0; | |
8cc44579 PM |
573 | } |
574 | ||
575 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
576 | /** | |
577 | * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry | |
13541b3a | 578 | * @net: network namespace |
8cc44579 PM |
579 | * @iface: interface entry |
580 | * @addr: IP address | |
581 | * @mask: IP address mask | |
13541b3a | 582 | * @audit_info: NetLabel audit information |
8cc44579 PM |
583 | * |
584 | * Description: | |
585 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 586 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
587 | * |
588 | */ | |
13541b3a PM |
589 | static int netlbl_unlhsh_remove_addr6(struct net *net, |
590 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 591 | const struct in6_addr *addr, |
13541b3a PM |
592 | const struct in6_addr *mask, |
593 | struct netlbl_audit *audit_info) | |
8cc44579 | 594 | { |
61e10682 | 595 | struct netlbl_af6list *list_entry; |
8cc44579 | 596 | struct netlbl_unlhsh_addr6 *entry; |
61e10682 | 597 | struct audit_buffer *audit_buf; |
13541b3a | 598 | struct net_device *dev; |
61e10682 | 599 | char *secctx; |
13541b3a | 600 | u32 secctx_len; |
8cc44579 PM |
601 | |
602 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 603 | list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); |
8cc44579 | 604 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
605 | if (list_entry != NULL) |
606 | entry = netlbl_unlhsh_addr6_entry(list_entry); | |
607 | else | |
ec8f2375 | 608 | entry = NULL; |
8cc44579 | 609 | |
13541b3a PM |
610 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
611 | audit_info); | |
612 | if (audit_buf != NULL) { | |
613 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
614 | netlbl_af6list_audit_addr(audit_buf, 1, |
615 | (dev != NULL ? dev->name : NULL), | |
616 | addr, mask); | |
13541b3a PM |
617 | if (dev != NULL) |
618 | dev_put(dev); | |
ec8f2375 PM |
619 | if (entry != NULL && |
620 | security_secid_to_secctx(entry->secid, | |
621 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
622 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
623 | security_release_secctx(secctx, secctx_len); | |
624 | } | |
ec8f2375 | 625 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
626 | audit_log_end(audit_buf); |
627 | } | |
628 | ||
ec8f2375 PM |
629 | if (entry == NULL) |
630 | return -ENOENT; | |
631 | ||
632 | call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6); | |
633 | return 0; | |
8cc44579 PM |
634 | } |
635 | #endif /* IPv6 */ | |
636 | ||
637 | /** | |
638 | * netlbl_unlhsh_condremove_iface - Remove an interface entry | |
639 | * @iface: the interface entry | |
640 | * | |
641 | * Description: | |
642 | * Remove an interface entry from the unlabeled connection hash table if it is | |
643 | * empty. An interface entry is considered to be empty if there are no | |
644 | * address entries assigned to it. | |
645 | * | |
646 | */ | |
647 | static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) | |
648 | { | |
61e10682 PM |
649 | struct netlbl_af4list *iter4; |
650 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
651 | struct netlbl_af6list *iter6; | |
652 | #endif /* IPv6 */ | |
8cc44579 PM |
653 | |
654 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
655 | netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list) |
656 | goto unlhsh_condremove_failure; | |
657 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
658 | netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list) | |
659 | goto unlhsh_condremove_failure; | |
660 | #endif /* IPv6 */ | |
8cc44579 PM |
661 | iface->valid = 0; |
662 | if (iface->ifindex > 0) | |
663 | list_del_rcu(&iface->list); | |
664 | else | |
665 | rcu_assign_pointer(netlbl_unlhsh_def, NULL); | |
666 | spin_unlock(&netlbl_unlhsh_lock); | |
667 | ||
668 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
669 | return; | |
670 | ||
671 | unlhsh_condremove_failure: | |
672 | spin_unlock(&netlbl_unlhsh_lock); | |
8cc44579 PM |
673 | } |
674 | ||
675 | /** | |
676 | * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table | |
677 | * @net: network namespace | |
678 | * @dev_name: interface name | |
679 | * @addr: IP address in network byte order | |
680 | * @mask: address mask in network byte order | |
681 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
13541b3a | 682 | * @audit_info: NetLabel audit information |
8cc44579 PM |
683 | * |
684 | * Description: | |
685 | * Removes and existing entry from the unlabeled connection hash table. | |
686 | * Returns zero on success, negative values on failure. | |
687 | * | |
688 | */ | |
6c2e8ac0 PM |
689 | int netlbl_unlhsh_remove(struct net *net, |
690 | const char *dev_name, | |
691 | const void *addr, | |
692 | const void *mask, | |
693 | u32 addr_len, | |
694 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
695 | { |
696 | int ret_val; | |
697 | struct net_device *dev; | |
698 | struct netlbl_unlhsh_iface *iface; | |
699 | ||
700 | if (addr_len != sizeof(struct in_addr) && | |
701 | addr_len != sizeof(struct in6_addr)) | |
702 | return -EINVAL; | |
703 | ||
704 | rcu_read_lock(); | |
705 | if (dev_name != NULL) { | |
122ec6ff | 706 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
707 | if (dev == NULL) { |
708 | ret_val = -ENODEV; | |
709 | goto unlhsh_remove_return; | |
710 | } | |
711 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
8cc44579 PM |
712 | } else |
713 | iface = rcu_dereference(netlbl_unlhsh_def); | |
714 | if (iface == NULL) { | |
715 | ret_val = -ENOENT; | |
716 | goto unlhsh_remove_return; | |
717 | } | |
718 | switch (addr_len) { | |
719 | case sizeof(struct in_addr): | |
13541b3a PM |
720 | ret_val = netlbl_unlhsh_remove_addr4(net, |
721 | iface, addr, mask, | |
722 | audit_info); | |
8cc44579 PM |
723 | break; |
724 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
725 | case sizeof(struct in6_addr): | |
13541b3a PM |
726 | ret_val = netlbl_unlhsh_remove_addr6(net, |
727 | iface, addr, mask, | |
728 | audit_info); | |
8cc44579 PM |
729 | break; |
730 | #endif /* IPv6 */ | |
731 | default: | |
732 | ret_val = -EINVAL; | |
733 | } | |
734 | if (ret_val == 0) { | |
735 | netlbl_unlhsh_condremove_iface(iface); | |
736 | atomic_dec(&netlabel_mgmt_protocount); | |
737 | } | |
738 | ||
739 | unlhsh_remove_return: | |
740 | rcu_read_unlock(); | |
741 | return ret_val; | |
742 | } | |
743 | ||
744 | /* | |
745 | * General Helper Functions | |
746 | */ | |
747 | ||
748 | /** | |
749 | * netlbl_unlhsh_netdev_handler - Network device notification handler | |
750 | * @this: notifier block | |
751 | * @event: the event | |
752 | * @ptr: the network device (cast to void) | |
753 | * | |
754 | * Description: | |
755 | * Handle network device events, although at present all we care about is a | |
756 | * network device going away. In the case of a device going away we clear any | |
757 | * related entries from the unlabeled connection hash table. | |
758 | * | |
759 | */ | |
760 | static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, | |
761 | unsigned long event, | |
762 | void *ptr) | |
763 | { | |
764 | struct net_device *dev = ptr; | |
765 | struct netlbl_unlhsh_iface *iface = NULL; | |
766 | ||
721499e8 | 767 | if (!net_eq(dev_net(dev), &init_net)) |
8cc44579 PM |
768 | return NOTIFY_DONE; |
769 | ||
770 | /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ | |
771 | if (event == NETDEV_DOWN) { | |
772 | spin_lock(&netlbl_unlhsh_lock); | |
773 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
774 | if (iface != NULL && iface->valid) { | |
775 | iface->valid = 0; | |
776 | list_del_rcu(&iface->list); | |
777 | } else | |
778 | iface = NULL; | |
779 | spin_unlock(&netlbl_unlhsh_lock); | |
780 | } | |
781 | ||
782 | if (iface != NULL) | |
783 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
784 | ||
785 | return NOTIFY_DONE; | |
786 | } | |
32f50cde PM |
787 | |
788 | /** | |
789 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
790 | * @value: desired value | |
95d4e6be | 791 | * @audit_info: NetLabel audit information |
32f50cde PM |
792 | * |
793 | * Description: | |
794 | * Set the value of the unlabeled accept flag to @value. | |
795 | * | |
796 | */ | |
95d4e6be PM |
797 | static void netlbl_unlabel_acceptflg_set(u8 value, |
798 | struct netlbl_audit *audit_info) | |
32f50cde | 799 | { |
95d4e6be PM |
800 | struct audit_buffer *audit_buf; |
801 | u8 old_val; | |
802 | ||
4be2700f | 803 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 804 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
805 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
806 | audit_info); | |
de64688f PM |
807 | if (audit_buf != NULL) { |
808 | audit_log_format(audit_buf, | |
809 | " unlbl_accept=%u old=%u", value, old_val); | |
810 | audit_log_end(audit_buf); | |
811 | } | |
32f50cde PM |
812 | } |
813 | ||
8cc44579 PM |
814 | /** |
815 | * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information | |
816 | * @info: the Generic NETLINK info block | |
817 | * @addr: the IP address | |
818 | * @mask: the IP address mask | |
819 | * @len: the address length | |
820 | * | |
821 | * Description: | |
822 | * Examine the Generic NETLINK message and extract the IP address information. | |
823 | * Returns zero on success, negative values on failure. | |
824 | * | |
825 | */ | |
826 | static int netlbl_unlabel_addrinfo_get(struct genl_info *info, | |
827 | void **addr, | |
828 | void **mask, | |
829 | u32 *len) | |
830 | { | |
831 | u32 addr_len; | |
832 | ||
833 | if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) { | |
834 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
835 | if (addr_len != sizeof(struct in_addr) && | |
836 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) | |
837 | return -EINVAL; | |
838 | *len = addr_len; | |
839 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
840 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); | |
841 | return 0; | |
842 | } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { | |
843 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
844 | if (addr_len != sizeof(struct in6_addr) && | |
845 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) | |
846 | return -EINVAL; | |
847 | *len = addr_len; | |
848 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
849 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); | |
850 | return 0; | |
851 | } | |
852 | ||
853 | return -EINVAL; | |
854 | } | |
855 | ||
96cb8e33 PM |
856 | /* |
857 | * NetLabel Command Handlers | |
858 | */ | |
859 | ||
860 | /** | |
861 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
862 | * @skb: the NETLINK buffer | |
863 | * @info: the Generic NETLINK info block | |
864 | * | |
865 | * Description: | |
866 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
867 | * Returns zero on success, negative values on failure. | |
868 | * | |
869 | */ | |
870 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
871 | { | |
fd385855 | 872 | u8 value; |
95d4e6be | 873 | struct netlbl_audit audit_info; |
96cb8e33 | 874 | |
fd385855 PM |
875 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
876 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 877 | if (value == 1 || value == 0) { |
95d4e6be PM |
878 | netlbl_netlink_auditinfo(skb, &audit_info); |
879 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 880 | return 0; |
96cb8e33 PM |
881 | } |
882 | } | |
883 | ||
32f50cde | 884 | return -EINVAL; |
96cb8e33 PM |
885 | } |
886 | ||
887 | /** | |
888 | * netlbl_unlabel_list - Handle a LIST message | |
889 | * @skb: the NETLINK buffer | |
890 | * @info: the Generic NETLINK info block | |
891 | * | |
892 | * Description: | |
893 | * Process a user generated LIST message and respond with the current status. | |
894 | * Returns zero on success, negative values on failure. | |
895 | * | |
896 | */ | |
897 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
898 | { | |
fd385855 | 899 | int ret_val = -EINVAL; |
96cb8e33 | 900 | struct sk_buff *ans_skb; |
fd385855 | 901 | void *data; |
96cb8e33 | 902 | |
339bf98f | 903 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
904 | if (ans_skb == NULL) |
905 | goto list_failure; | |
17c157c8 TG |
906 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
907 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
908 | if (data == NULL) { |
909 | ret_val = -ENOMEM; | |
96cb8e33 | 910 | goto list_failure; |
fd385855 | 911 | } |
96cb8e33 | 912 | |
fd385855 PM |
913 | ret_val = nla_put_u8(ans_skb, |
914 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 915 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
916 | if (ret_val != 0) |
917 | goto list_failure; | |
918 | ||
fd385855 | 919 | genlmsg_end(ans_skb, data); |
fe785bee | 920 | return genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
921 | |
922 | list_failure: | |
b08d5840 | 923 | kfree_skb(ans_skb); |
96cb8e33 PM |
924 | return ret_val; |
925 | } | |
926 | ||
8cc44579 PM |
927 | /** |
928 | * netlbl_unlabel_staticadd - Handle a STATICADD message | |
929 | * @skb: the NETLINK buffer | |
930 | * @info: the Generic NETLINK info block | |
931 | * | |
932 | * Description: | |
933 | * Process a user generated STATICADD message and add a new unlabeled | |
934 | * connection entry to the hash table. Returns zero on success, negative | |
935 | * values on failure. | |
936 | * | |
937 | */ | |
938 | static int netlbl_unlabel_staticadd(struct sk_buff *skb, | |
939 | struct genl_info *info) | |
940 | { | |
941 | int ret_val; | |
942 | char *dev_name; | |
943 | void *addr; | |
944 | void *mask; | |
945 | u32 addr_len; | |
946 | u32 secid; | |
13541b3a | 947 | struct netlbl_audit audit_info; |
8cc44579 PM |
948 | |
949 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
950 | * single entry. However, allow users to create two entries, one each | |
951 | * for IPv4 and IPv4, with the same LSM security context which should | |
952 | * achieve the same result. */ | |
953 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
954 | !info->attrs[NLBL_UNLABEL_A_IFACE] || | |
955 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
956 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
957 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
958 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
959 | return -EINVAL; | |
960 | ||
13541b3a PM |
961 | netlbl_netlink_auditinfo(skb, &audit_info); |
962 | ||
8cc44579 PM |
963 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
964 | if (ret_val != 0) | |
965 | return ret_val; | |
966 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
967 | ret_val = security_secctx_to_secid( | |
968 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
969 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
970 | &secid); | |
971 | if (ret_val != 0) | |
972 | return ret_val; | |
973 | ||
974 | return netlbl_unlhsh_add(&init_net, | |
13541b3a PM |
975 | dev_name, addr, mask, addr_len, secid, |
976 | &audit_info); | |
8cc44579 PM |
977 | } |
978 | ||
979 | /** | |
980 | * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message | |
981 | * @skb: the NETLINK buffer | |
982 | * @info: the Generic NETLINK info block | |
983 | * | |
984 | * Description: | |
985 | * Process a user generated STATICADDDEF message and add a new default | |
986 | * unlabeled connection entry. Returns zero on success, negative values on | |
987 | * failure. | |
988 | * | |
989 | */ | |
990 | static int netlbl_unlabel_staticadddef(struct sk_buff *skb, | |
991 | struct genl_info *info) | |
992 | { | |
993 | int ret_val; | |
994 | void *addr; | |
995 | void *mask; | |
996 | u32 addr_len; | |
997 | u32 secid; | |
13541b3a | 998 | struct netlbl_audit audit_info; |
8cc44579 PM |
999 | |
1000 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
1001 | * single entry. However, allow users to create two entries, one each | |
1002 | * for IPv4 and IPv6, with the same LSM security context which should | |
1003 | * achieve the same result. */ | |
1004 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
1005 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1006 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1007 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1008 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1009 | return -EINVAL; | |
1010 | ||
13541b3a PM |
1011 | netlbl_netlink_auditinfo(skb, &audit_info); |
1012 | ||
8cc44579 PM |
1013 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1014 | if (ret_val != 0) | |
1015 | return ret_val; | |
1016 | ret_val = security_secctx_to_secid( | |
1017 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1018 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
1019 | &secid); | |
1020 | if (ret_val != 0) | |
1021 | return ret_val; | |
1022 | ||
13541b3a PM |
1023 | return netlbl_unlhsh_add(&init_net, |
1024 | NULL, addr, mask, addr_len, secid, | |
1025 | &audit_info); | |
8cc44579 PM |
1026 | } |
1027 | ||
1028 | /** | |
1029 | * netlbl_unlabel_staticremove - Handle a STATICREMOVE message | |
1030 | * @skb: the NETLINK buffer | |
1031 | * @info: the Generic NETLINK info block | |
1032 | * | |
1033 | * Description: | |
1034 | * Process a user generated STATICREMOVE message and remove the specified | |
1035 | * unlabeled connection entry. Returns zero on success, negative values on | |
1036 | * failure. | |
1037 | * | |
1038 | */ | |
1039 | static int netlbl_unlabel_staticremove(struct sk_buff *skb, | |
1040 | struct genl_info *info) | |
1041 | { | |
1042 | int ret_val; | |
1043 | char *dev_name; | |
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_IFACE] || | |
1052 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1053 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1054 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1055 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1056 | return -EINVAL; | |
1057 | ||
13541b3a PM |
1058 | netlbl_netlink_auditinfo(skb, &audit_info); |
1059 | ||
8cc44579 PM |
1060 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1061 | if (ret_val != 0) | |
1062 | return ret_val; | |
1063 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1064 | ||
13541b3a PM |
1065 | return netlbl_unlhsh_remove(&init_net, |
1066 | dev_name, addr, mask, addr_len, | |
1067 | &audit_info); | |
8cc44579 PM |
1068 | } |
1069 | ||
1070 | /** | |
1071 | * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message | |
1072 | * @skb: the NETLINK buffer | |
1073 | * @info: the Generic NETLINK info block | |
1074 | * | |
1075 | * Description: | |
1076 | * Process a user generated STATICREMOVEDEF message and remove the default | |
1077 | * unlabeled connection entry. Returns zero on success, negative values on | |
1078 | * failure. | |
1079 | * | |
1080 | */ | |
1081 | static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, | |
1082 | struct genl_info *info) | |
1083 | { | |
1084 | int ret_val; | |
1085 | void *addr; | |
1086 | void *mask; | |
1087 | u32 addr_len; | |
13541b3a | 1088 | struct netlbl_audit audit_info; |
8cc44579 PM |
1089 | |
1090 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1091 | * IPv4 and IPv6 in the same entry. */ | |
1092 | if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1093 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1094 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1095 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1096 | return -EINVAL; | |
1097 | ||
13541b3a PM |
1098 | netlbl_netlink_auditinfo(skb, &audit_info); |
1099 | ||
8cc44579 PM |
1100 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1101 | if (ret_val != 0) | |
1102 | return ret_val; | |
1103 | ||
13541b3a PM |
1104 | return netlbl_unlhsh_remove(&init_net, |
1105 | NULL, addr, mask, addr_len, | |
1106 | &audit_info); | |
8cc44579 PM |
1107 | } |
1108 | ||
1109 | ||
1110 | /** | |
1111 | * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] | |
1112 | * @cmd: command/message | |
1113 | * @iface: the interface entry | |
1114 | * @addr4: the IPv4 address entry | |
1115 | * @addr6: the IPv6 address entry | |
1116 | * @arg: the netlbl_unlhsh_walk_arg structure | |
1117 | * | |
1118 | * Description: | |
1119 | * This function is designed to be used to generate a response for a | |
1120 | * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 | |
1121 | * can be specified, not both, the other unspecified entry should be set to | |
1122 | * NULL by the caller. Returns the size of the message on success, negative | |
1123 | * values on failure. | |
1124 | * | |
1125 | */ | |
1126 | static int netlbl_unlabel_staticlist_gen(u32 cmd, | |
1127 | const struct netlbl_unlhsh_iface *iface, | |
1128 | const struct netlbl_unlhsh_addr4 *addr4, | |
1129 | const struct netlbl_unlhsh_addr6 *addr6, | |
1130 | void *arg) | |
1131 | { | |
1132 | int ret_val = -ENOMEM; | |
1133 | struct netlbl_unlhsh_walk_arg *cb_arg = arg; | |
1134 | struct net_device *dev; | |
1135 | void *data; | |
1136 | u32 secid; | |
1137 | char *secctx; | |
1138 | u32 secctx_len; | |
1139 | ||
1140 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid, | |
1141 | cb_arg->seq, &netlbl_unlabel_gnl_family, | |
1142 | NLM_F_MULTI, cmd); | |
1143 | if (data == NULL) | |
1144 | goto list_cb_failure; | |
1145 | ||
1146 | if (iface->ifindex > 0) { | |
1147 | dev = dev_get_by_index(&init_net, iface->ifindex); | |
794eb6bf JJ |
1148 | if (!dev) { |
1149 | ret_val = -ENODEV; | |
1150 | goto list_cb_failure; | |
1151 | } | |
8cc44579 PM |
1152 | ret_val = nla_put_string(cb_arg->skb, |
1153 | NLBL_UNLABEL_A_IFACE, dev->name); | |
1154 | dev_put(dev); | |
1155 | if (ret_val != 0) | |
1156 | goto list_cb_failure; | |
1157 | } | |
1158 | ||
1159 | if (addr4) { | |
1160 | struct in_addr addr_struct; | |
1161 | ||
61e10682 | 1162 | addr_struct.s_addr = addr4->list.addr; |
8cc44579 PM |
1163 | ret_val = nla_put(cb_arg->skb, |
1164 | NLBL_UNLABEL_A_IPV4ADDR, | |
1165 | sizeof(struct in_addr), | |
1166 | &addr_struct); | |
1167 | if (ret_val != 0) | |
1168 | goto list_cb_failure; | |
1169 | ||
61e10682 | 1170 | addr_struct.s_addr = addr4->list.mask; |
8cc44579 PM |
1171 | ret_val = nla_put(cb_arg->skb, |
1172 | NLBL_UNLABEL_A_IPV4MASK, | |
1173 | sizeof(struct in_addr), | |
1174 | &addr_struct); | |
1175 | if (ret_val != 0) | |
1176 | goto list_cb_failure; | |
1177 | ||
1178 | secid = addr4->secid; | |
1179 | } else { | |
1180 | ret_val = nla_put(cb_arg->skb, | |
1181 | NLBL_UNLABEL_A_IPV6ADDR, | |
1182 | sizeof(struct in6_addr), | |
61e10682 | 1183 | &addr6->list.addr); |
8cc44579 PM |
1184 | if (ret_val != 0) |
1185 | goto list_cb_failure; | |
1186 | ||
1187 | ret_val = nla_put(cb_arg->skb, | |
1188 | NLBL_UNLABEL_A_IPV6MASK, | |
1189 | sizeof(struct in6_addr), | |
61e10682 | 1190 | &addr6->list.mask); |
8cc44579 PM |
1191 | if (ret_val != 0) |
1192 | goto list_cb_failure; | |
1193 | ||
1194 | secid = addr6->secid; | |
1195 | } | |
1196 | ||
1197 | ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); | |
1198 | if (ret_val != 0) | |
1199 | goto list_cb_failure; | |
1200 | ret_val = nla_put(cb_arg->skb, | |
1201 | NLBL_UNLABEL_A_SECCTX, | |
1202 | secctx_len, | |
1203 | secctx); | |
1204 | security_release_secctx(secctx, secctx_len); | |
1205 | if (ret_val != 0) | |
1206 | goto list_cb_failure; | |
1207 | ||
1208 | cb_arg->seq++; | |
1209 | return genlmsg_end(cb_arg->skb, data); | |
1210 | ||
1211 | list_cb_failure: | |
1212 | genlmsg_cancel(cb_arg->skb, data); | |
1213 | return ret_val; | |
1214 | } | |
1215 | ||
1216 | /** | |
1217 | * netlbl_unlabel_staticlist - Handle a STATICLIST message | |
1218 | * @skb: the NETLINK buffer | |
1219 | * @cb: the NETLINK callback | |
1220 | * | |
1221 | * Description: | |
1222 | * Process a user generated STATICLIST message and dump the unlabeled | |
1223 | * connection hash table in a form suitable for use in a kernel generated | |
1224 | * STATICLIST message. Returns the length of @skb. | |
1225 | * | |
1226 | */ | |
1227 | static int netlbl_unlabel_staticlist(struct sk_buff *skb, | |
1228 | struct netlink_callback *cb) | |
1229 | { | |
1230 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1231 | u32 skip_bkt = cb->args[0]; | |
1232 | u32 skip_chain = cb->args[1]; | |
1233 | u32 skip_addr4 = cb->args[2]; | |
1234 | u32 skip_addr6 = cb->args[3]; | |
1235 | u32 iter_bkt; | |
1236 | u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; | |
1237 | struct netlbl_unlhsh_iface *iface; | |
56196701 | 1238 | struct list_head *iter_list; |
61e10682 PM |
1239 | struct netlbl_af4list *addr4; |
1240 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1241 | struct netlbl_af6list *addr6; | |
1242 | #endif | |
8cc44579 PM |
1243 | |
1244 | cb_arg.nl_cb = cb; | |
1245 | cb_arg.skb = skb; | |
1246 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1247 | ||
1248 | rcu_read_lock(); | |
1249 | for (iter_bkt = skip_bkt; | |
1250 | iter_bkt < rcu_dereference(netlbl_unlhsh)->size; | |
1251 | iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) { | |
56196701 PM |
1252 | iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; |
1253 | list_for_each_entry_rcu(iface, iter_list, list) { | |
8cc44579 PM |
1254 | if (!iface->valid || |
1255 | iter_chain++ < skip_chain) | |
1256 | continue; | |
61e10682 PM |
1257 | netlbl_af4list_foreach_rcu(addr4, |
1258 | &iface->addr4_list) { | |
1259 | if (iter_addr4++ < skip_addr4) | |
8cc44579 PM |
1260 | continue; |
1261 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1262 | NLBL_UNLABEL_C_STATICLIST, |
1263 | iface, | |
1264 | netlbl_unlhsh_addr4_entry(addr4), | |
1265 | NULL, | |
1266 | &cb_arg) < 0) { | |
8cc44579 PM |
1267 | iter_addr4--; |
1268 | iter_chain--; | |
1269 | goto unlabel_staticlist_return; | |
1270 | } | |
1271 | } | |
61e10682 PM |
1272 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1273 | netlbl_af6list_foreach_rcu(addr6, | |
1274 | &iface->addr6_list) { | |
1275 | if (iter_addr6++ < skip_addr6) | |
8cc44579 PM |
1276 | continue; |
1277 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1278 | NLBL_UNLABEL_C_STATICLIST, |
1279 | iface, | |
1280 | NULL, | |
1281 | netlbl_unlhsh_addr6_entry(addr6), | |
1282 | &cb_arg) < 0) { | |
8cc44579 PM |
1283 | iter_addr6--; |
1284 | iter_chain--; | |
1285 | goto unlabel_staticlist_return; | |
1286 | } | |
1287 | } | |
61e10682 | 1288 | #endif /* IPv6 */ |
8cc44579 PM |
1289 | } |
1290 | } | |
1291 | ||
1292 | unlabel_staticlist_return: | |
1293 | rcu_read_unlock(); | |
1294 | cb->args[0] = skip_bkt; | |
1295 | cb->args[1] = skip_chain; | |
1296 | cb->args[2] = skip_addr4; | |
1297 | cb->args[3] = skip_addr6; | |
1298 | return skb->len; | |
1299 | } | |
1300 | ||
1301 | /** | |
1302 | * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message | |
1303 | * @skb: the NETLINK buffer | |
1304 | * @cb: the NETLINK callback | |
1305 | * | |
1306 | * Description: | |
1307 | * Process a user generated STATICLISTDEF message and dump the default | |
1308 | * unlabeled connection entry in a form suitable for use in a kernel generated | |
1309 | * STATICLISTDEF message. Returns the length of @skb. | |
1310 | * | |
1311 | */ | |
1312 | static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, | |
1313 | struct netlink_callback *cb) | |
1314 | { | |
1315 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1316 | struct netlbl_unlhsh_iface *iface; | |
1317 | u32 skip_addr4 = cb->args[0]; | |
1318 | u32 skip_addr6 = cb->args[1]; | |
61e10682 PM |
1319 | u32 iter_addr4 = 0; |
1320 | struct netlbl_af4list *addr4; | |
1321 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1322 | u32 iter_addr6 = 0; | |
1323 | struct netlbl_af6list *addr6; | |
1324 | #endif | |
8cc44579 PM |
1325 | |
1326 | cb_arg.nl_cb = cb; | |
1327 | cb_arg.skb = skb; | |
1328 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1329 | ||
1330 | rcu_read_lock(); | |
1331 | iface = rcu_dereference(netlbl_unlhsh_def); | |
1332 | if (iface == NULL || !iface->valid) | |
1333 | goto unlabel_staticlistdef_return; | |
1334 | ||
61e10682 PM |
1335 | netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
1336 | if (iter_addr4++ < skip_addr4) | |
8cc44579 PM |
1337 | continue; |
1338 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1339 | iface, |
1340 | netlbl_unlhsh_addr4_entry(addr4), | |
1341 | NULL, | |
1342 | &cb_arg) < 0) { | |
8cc44579 PM |
1343 | iter_addr4--; |
1344 | goto unlabel_staticlistdef_return; | |
1345 | } | |
1346 | } | |
61e10682 PM |
1347 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
1348 | netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { | |
1349 | if (iter_addr6++ < skip_addr6) | |
8cc44579 PM |
1350 | continue; |
1351 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1352 | iface, |
1353 | NULL, | |
1354 | netlbl_unlhsh_addr6_entry(addr6), | |
1355 | &cb_arg) < 0) { | |
8cc44579 PM |
1356 | iter_addr6--; |
1357 | goto unlabel_staticlistdef_return; | |
1358 | } | |
1359 | } | |
61e10682 | 1360 | #endif /* IPv6 */ |
8cc44579 PM |
1361 | |
1362 | unlabel_staticlistdef_return: | |
1363 | rcu_read_unlock(); | |
1364 | cb->args[0] = skip_addr4; | |
1365 | cb->args[1] = skip_addr6; | |
1366 | return skb->len; | |
1367 | } | |
96cb8e33 PM |
1368 | |
1369 | /* | |
1370 | * NetLabel Generic NETLINK Command Definitions | |
1371 | */ | |
1372 | ||
227c43c3 PE |
1373 | static struct genl_ops netlbl_unlabel_genl_ops[] = { |
1374 | { | |
8cc44579 PM |
1375 | .cmd = NLBL_UNLABEL_C_STATICADD, |
1376 | .flags = GENL_ADMIN_PERM, | |
1377 | .policy = netlbl_unlabel_genl_policy, | |
1378 | .doit = netlbl_unlabel_staticadd, | |
1379 | .dumpit = NULL, | |
227c43c3 PE |
1380 | }, |
1381 | { | |
8cc44579 PM |
1382 | .cmd = NLBL_UNLABEL_C_STATICREMOVE, |
1383 | .flags = GENL_ADMIN_PERM, | |
1384 | .policy = netlbl_unlabel_genl_policy, | |
1385 | .doit = netlbl_unlabel_staticremove, | |
1386 | .dumpit = NULL, | |
227c43c3 PE |
1387 | }, |
1388 | { | |
8cc44579 PM |
1389 | .cmd = NLBL_UNLABEL_C_STATICLIST, |
1390 | .flags = 0, | |
1391 | .policy = netlbl_unlabel_genl_policy, | |
1392 | .doit = NULL, | |
1393 | .dumpit = netlbl_unlabel_staticlist, | |
227c43c3 PE |
1394 | }, |
1395 | { | |
8cc44579 PM |
1396 | .cmd = NLBL_UNLABEL_C_STATICADDDEF, |
1397 | .flags = GENL_ADMIN_PERM, | |
1398 | .policy = netlbl_unlabel_genl_policy, | |
1399 | .doit = netlbl_unlabel_staticadddef, | |
1400 | .dumpit = NULL, | |
227c43c3 PE |
1401 | }, |
1402 | { | |
8cc44579 PM |
1403 | .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, |
1404 | .flags = GENL_ADMIN_PERM, | |
1405 | .policy = netlbl_unlabel_genl_policy, | |
1406 | .doit = netlbl_unlabel_staticremovedef, | |
1407 | .dumpit = NULL, | |
227c43c3 PE |
1408 | }, |
1409 | { | |
8cc44579 PM |
1410 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
1411 | .flags = 0, | |
1412 | .policy = netlbl_unlabel_genl_policy, | |
1413 | .doit = NULL, | |
1414 | .dumpit = netlbl_unlabel_staticlistdef, | |
227c43c3 PE |
1415 | }, |
1416 | { | |
96cb8e33 | 1417 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
fd385855 PM |
1418 | .flags = GENL_ADMIN_PERM, |
1419 | .policy = netlbl_unlabel_genl_policy, | |
96cb8e33 PM |
1420 | .doit = netlbl_unlabel_accept, |
1421 | .dumpit = NULL, | |
227c43c3 PE |
1422 | }, |
1423 | { | |
96cb8e33 PM |
1424 | .cmd = NLBL_UNLABEL_C_LIST, |
1425 | .flags = 0, | |
fd385855 | 1426 | .policy = netlbl_unlabel_genl_policy, |
96cb8e33 PM |
1427 | .doit = netlbl_unlabel_list, |
1428 | .dumpit = NULL, | |
227c43c3 | 1429 | }, |
96cb8e33 PM |
1430 | }; |
1431 | ||
96cb8e33 PM |
1432 | /* |
1433 | * NetLabel Generic NETLINK Protocol Functions | |
1434 | */ | |
1435 | ||
1436 | /** | |
1437 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
1438 | * | |
1439 | * Description: | |
1440 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
1441 | * mechanism. Returns zero on success, negative values on failure. | |
1442 | * | |
1443 | */ | |
05705e4e | 1444 | int __init netlbl_unlabel_genl_init(void) |
96cb8e33 | 1445 | { |
7ae740df MM |
1446 | return genl_register_family_with_ops(&netlbl_unlabel_gnl_family, |
1447 | netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops)); | |
96cb8e33 PM |
1448 | } |
1449 | ||
1450 | /* | |
1451 | * NetLabel KAPI Hooks | |
1452 | */ | |
1453 | ||
8cc44579 PM |
1454 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1455 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1456 | }; | |
1457 | ||
1458 | /** | |
1459 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1460 | * @size: the number of bits to use for the hash buckets | |
1461 | * | |
1462 | * Description: | |
1463 | * Initializes the unlabeled connection hash table and registers a network | |
1464 | * device notification handler. This function should only be called by the | |
1465 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1466 | * non-zero values on error. | |
1467 | * | |
1468 | */ | |
05705e4e | 1469 | int __init netlbl_unlabel_init(u32 size) |
8cc44579 PM |
1470 | { |
1471 | u32 iter; | |
1472 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1473 | ||
1474 | if (size == 0) | |
1475 | return -EINVAL; | |
1476 | ||
1477 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1478 | if (hsh_tbl == NULL) | |
1479 | return -ENOMEM; | |
1480 | hsh_tbl->size = 1 << size; | |
1481 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1482 | sizeof(struct list_head), | |
1483 | GFP_KERNEL); | |
1484 | if (hsh_tbl->tbl == NULL) { | |
1485 | kfree(hsh_tbl); | |
1486 | return -ENOMEM; | |
1487 | } | |
1488 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1489 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1490 | ||
1491 | rcu_read_lock(); | |
1492 | spin_lock(&netlbl_unlhsh_lock); | |
1493 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); | |
1494 | spin_unlock(&netlbl_unlhsh_lock); | |
1495 | rcu_read_unlock(); | |
1496 | ||
1497 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1498 | ||
1499 | return 0; | |
1500 | } | |
1501 | ||
96cb8e33 PM |
1502 | /** |
1503 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1504 | * @skb: the packet |
1505 | * @family: protocol family | |
96cb8e33 PM |
1506 | * @secattr: the security attributes |
1507 | * | |
1508 | * Description: | |
1509 | * Determine the security attributes, if any, for an unlabled packet and return | |
1510 | * them in @secattr. Returns zero on success and negative values on failure. | |
1511 | * | |
1512 | */ | |
8cc44579 PM |
1513 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1514 | u16 family, | |
1515 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1516 | { |
8cc44579 PM |
1517 | struct netlbl_unlhsh_iface *iface; |
1518 | ||
1519 | rcu_read_lock(); | |
b914f3a2 | 1520 | iface = netlbl_unlhsh_search_iface(skb->skb_iif); |
8cc44579 | 1521 | if (iface == NULL) |
b914f3a2 PM |
1522 | iface = rcu_dereference(netlbl_unlhsh_def); |
1523 | if (iface == NULL || !iface->valid) | |
8cc44579 PM |
1524 | goto unlabel_getattr_nolabel; |
1525 | switch (family) { | |
56628b1d PE |
1526 | case PF_INET: { |
1527 | struct iphdr *hdr4; | |
61e10682 | 1528 | struct netlbl_af4list *addr4; |
56628b1d | 1529 | |
8cc44579 | 1530 | hdr4 = ip_hdr(skb); |
61e10682 PM |
1531 | addr4 = netlbl_af4list_search(hdr4->saddr, |
1532 | &iface->addr4_list); | |
8cc44579 PM |
1533 | if (addr4 == NULL) |
1534 | goto unlabel_getattr_nolabel; | |
61e10682 | 1535 | secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
8cc44579 | 1536 | break; |
56628b1d | 1537 | } |
8cc44579 | 1538 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
56628b1d PE |
1539 | case PF_INET6: { |
1540 | struct ipv6hdr *hdr6; | |
61e10682 | 1541 | struct netlbl_af6list *addr6; |
56628b1d | 1542 | |
8cc44579 | 1543 | hdr6 = ipv6_hdr(skb); |
61e10682 PM |
1544 | addr6 = netlbl_af6list_search(&hdr6->saddr, |
1545 | &iface->addr6_list); | |
8cc44579 PM |
1546 | if (addr6 == NULL) |
1547 | goto unlabel_getattr_nolabel; | |
61e10682 | 1548 | secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; |
8cc44579 | 1549 | break; |
56628b1d | 1550 | } |
8cc44579 PM |
1551 | #endif /* IPv6 */ |
1552 | default: | |
1553 | goto unlabel_getattr_nolabel; | |
1554 | } | |
1555 | rcu_read_unlock(); | |
1556 | ||
1557 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1558 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1559 | return 0; | |
1560 | ||
1561 | unlabel_getattr_nolabel: | |
1562 | rcu_read_unlock(); | |
c783f1ce PM |
1563 | if (netlabel_unlabel_acceptflg == 0) |
1564 | return -ENOMSG; | |
16efd454 | 1565 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1566 | return 0; |
96cb8e33 PM |
1567 | } |
1568 | ||
1569 | /** | |
1570 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1571 | * | |
1572 | * Description: | |
1573 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1574 | * and to send unlabeled network traffic by default. | |
1575 | * | |
1576 | */ | |
05705e4e | 1577 | int __init netlbl_unlabel_defconf(void) |
96cb8e33 PM |
1578 | { |
1579 | int ret_val; | |
1580 | struct netlbl_dom_map *entry; | |
95d4e6be | 1581 | struct netlbl_audit audit_info; |
32f50cde | 1582 | |
95d4e6be PM |
1583 | /* Only the kernel is allowed to call this function and the only time |
1584 | * it is called is at bootup before the audit subsystem is reporting | |
1585 | * messages so don't worry to much about these values. */ | |
1586 | security_task_getsecid(current, &audit_info.secid); | |
1587 | audit_info.loginuid = 0; | |
2532386f | 1588 | audit_info.sessionid = 0; |
96cb8e33 PM |
1589 | |
1590 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1591 | if (entry == NULL) | |
1592 | return -ENOMEM; | |
1593 | entry->type = NETLBL_NLTYPE_UNLABELED; | |
95d4e6be | 1594 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1595 | if (ret_val != 0) |
1596 | return ret_val; | |
1597 | ||
95d4e6be | 1598 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1599 | |
1600 | return 0; | |
1601 | } |