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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
96cb8e33 PM |
2 | /* |
3 | * NetLabel Unlabeled Support | |
4 | * | |
5 | * This file defines functions for dealing with unlabeled packets for the | |
6 | * NetLabel system. The NetLabel system manages static and dynamic label | |
7 | * mappings for network protocols such as CIPSO and RIPSO. | |
8 | * | |
82c21bfa | 9 | * Author: Paul Moore <paul@paul-moore.com> |
96cb8e33 PM |
10 | */ |
11 | ||
12 | /* | |
61e10682 | 13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008 |
96cb8e33 PM |
14 | */ |
15 | ||
16 | #include <linux/types.h> | |
8cc44579 | 17 | #include <linux/rcupdate.h> |
96cb8e33 PM |
18 | #include <linux/list.h> |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/socket.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/skbuff.h> | |
de64688f | 23 | #include <linux/audit.h> |
8cc44579 PM |
24 | #include <linux/in.h> |
25 | #include <linux/in6.h> | |
26 | #include <linux/ip.h> | |
27 | #include <linux/ipv6.h> | |
28 | #include <linux/notifier.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/security.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
96cb8e33 PM |
32 | #include <net/sock.h> |
33 | #include <net/netlink.h> | |
34 | #include <net/genetlink.h> | |
8cc44579 PM |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
37 | #include <net/net_namespace.h> | |
96cb8e33 PM |
38 | #include <net/netlabel.h> |
39 | #include <asm/bug.h> | |
60063497 | 40 | #include <linux/atomic.h> |
96cb8e33 PM |
41 | |
42 | #include "netlabel_user.h" | |
61e10682 | 43 | #include "netlabel_addrlist.h" |
96cb8e33 PM |
44 | #include "netlabel_domainhash.h" |
45 | #include "netlabel_unlabeled.h" | |
8cc44579 PM |
46 | #include "netlabel_mgmt.h" |
47 | ||
48 | /* NOTE: at present we always use init's network namespace since we don't | |
49 | * presently support different namespaces even though the majority of | |
50 | * the functions in this file are "namespace safe" */ | |
51 | ||
52 | /* The unlabeled connection hash table which we use to map network interfaces | |
53 | * and addresses of unlabeled packets to a user specified secid value for the | |
54 | * LSM. The hash table is used to lookup the network interface entry | |
55 | * (struct netlbl_unlhsh_iface) and then the interface entry is used to | |
56 | * lookup an IP address match from an ordered list. If a network interface | |
57 | * match can not be found in the hash table then the default entry | |
58 | * (netlbl_unlhsh_def) is used. The IP address entry list | |
59 | * (struct netlbl_unlhsh_addr) is ordered such that the entries with a | |
60 | * larger netmask come first. | |
61 | */ | |
62 | struct netlbl_unlhsh_tbl { | |
63 | struct list_head *tbl; | |
64 | u32 size; | |
65 | }; | |
61e10682 PM |
66 | #define netlbl_unlhsh_addr4_entry(iter) \ |
67 | container_of(iter, struct netlbl_unlhsh_addr4, list) | |
8cc44579 | 68 | struct netlbl_unlhsh_addr4 { |
8cc44579 PM |
69 | u32 secid; |
70 | ||
61e10682 | 71 | struct netlbl_af4list list; |
8cc44579 PM |
72 | struct rcu_head rcu; |
73 | }; | |
61e10682 PM |
74 | #define netlbl_unlhsh_addr6_entry(iter) \ |
75 | container_of(iter, struct netlbl_unlhsh_addr6, list) | |
8cc44579 | 76 | struct netlbl_unlhsh_addr6 { |
8cc44579 PM |
77 | u32 secid; |
78 | ||
61e10682 | 79 | struct netlbl_af6list list; |
8cc44579 PM |
80 | struct rcu_head rcu; |
81 | }; | |
82 | struct netlbl_unlhsh_iface { | |
83 | int ifindex; | |
84 | struct list_head addr4_list; | |
85 | struct list_head addr6_list; | |
86 | ||
87 | u32 valid; | |
88 | struct list_head list; | |
89 | struct rcu_head rcu; | |
90 | }; | |
91 | ||
92 | /* Argument struct for netlbl_unlhsh_walk() */ | |
93 | struct netlbl_unlhsh_walk_arg { | |
94 | struct netlink_callback *nl_cb; | |
95 | struct sk_buff *skb; | |
96 | u32 seq; | |
97 | }; | |
98 | ||
99 | /* Unlabeled connection hash table */ | |
100 | /* updates should be so rare that having one spinlock for the entire | |
101 | * hash table should be okay */ | |
102 | static DEFINE_SPINLOCK(netlbl_unlhsh_lock); | |
b914f3a2 | 103 | #define netlbl_unlhsh_rcu_deref(p) \ |
d8bf4ca9 | 104 | rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock)) |
96a8f7f8 HD |
105 | static struct netlbl_unlhsh_tbl __rcu *netlbl_unlhsh; |
106 | static struct netlbl_unlhsh_iface __rcu *netlbl_unlhsh_def; | |
96cb8e33 PM |
107 | |
108 | /* Accept unlabeled packets flag */ | |
795f3512 | 109 | static u8 netlabel_unlabel_acceptflg; |
96cb8e33 | 110 | |
8cc44579 | 111 | /* NetLabel Generic NETLINK unlabeled family */ |
489111e5 | 112 | static struct genl_family netlbl_unlabel_gnl_family; |
96cb8e33 | 113 | |
fd385855 | 114 | /* NetLabel Netlink attribute policy */ |
ef7c79ed | 115 | static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
fd385855 | 116 | [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
8cc44579 PM |
117 | [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY, |
118 | .len = sizeof(struct in6_addr) }, | |
119 | [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY, | |
120 | .len = sizeof(struct in6_addr) }, | |
121 | [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY, | |
122 | .len = sizeof(struct in_addr) }, | |
123 | [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY, | |
124 | .len = sizeof(struct in_addr) }, | |
125 | [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING, | |
126 | .len = IFNAMSIZ - 1 }, | |
127 | [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY } | |
fd385855 | 128 | }; |
96cb8e33 | 129 | |
32f50cde | 130 | /* |
8cc44579 PM |
131 | * Unlabeled Connection Hash Table Functions |
132 | */ | |
133 | ||
8cc44579 PM |
134 | /** |
135 | * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table | |
136 | * @entry: the entry's RCU field | |
137 | * | |
138 | * Description: | |
139 | * This function is designed to be used as a callback to the call_rcu() | |
140 | * function so that memory allocated to a hash table interface entry can be | |
141 | * released safely. It is important to note that this function does not free | |
142 | * the IPv4 and IPv6 address lists contained as part of an interface entry. It | |
143 | * is up to the rest of the code to make sure an interface entry is only freed | |
144 | * once it's address lists are empty. | |
145 | * | |
146 | */ | |
147 | static void netlbl_unlhsh_free_iface(struct rcu_head *entry) | |
148 | { | |
149 | struct netlbl_unlhsh_iface *iface; | |
61e10682 PM |
150 | struct netlbl_af4list *iter4; |
151 | struct netlbl_af4list *tmp4; | |
dfd56b8b | 152 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
153 | struct netlbl_af6list *iter6; |
154 | struct netlbl_af6list *tmp6; | |
155 | #endif /* IPv6 */ | |
8cc44579 PM |
156 | |
157 | iface = container_of(entry, struct netlbl_unlhsh_iface, rcu); | |
158 | ||
159 | /* no need for locks here since we are the only one with access to this | |
160 | * structure */ | |
161 | ||
61e10682 PM |
162 | netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) { |
163 | netlbl_af4list_remove_entry(iter4); | |
164 | kfree(netlbl_unlhsh_addr4_entry(iter4)); | |
165 | } | |
dfd56b8b | 166 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
167 | netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) { |
168 | netlbl_af6list_remove_entry(iter6); | |
169 | kfree(netlbl_unlhsh_addr6_entry(iter6)); | |
170 | } | |
171 | #endif /* IPv6 */ | |
8cc44579 PM |
172 | kfree(iface); |
173 | } | |
174 | ||
175 | /** | |
176 | * netlbl_unlhsh_hash - Hashing function for the hash table | |
177 | * @ifindex: the network interface/device to hash | |
178 | * | |
179 | * Description: | |
180 | * This is the hashing function for the unlabeled hash table, it returns the | |
181 | * bucket number for the given device/interface. The caller is responsible for | |
b914f3a2 PM |
182 | * ensuring that the hash table is protected with either a RCU read lock or |
183 | * the hash table lock. | |
8cc44579 PM |
184 | * |
185 | */ | |
186 | static u32 netlbl_unlhsh_hash(int ifindex) | |
187 | { | |
b914f3a2 | 188 | return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1); |
8cc44579 PM |
189 | } |
190 | ||
8cc44579 PM |
191 | /** |
192 | * netlbl_unlhsh_search_iface - Search for a matching interface entry | |
193 | * @ifindex: the network interface | |
194 | * | |
195 | * Description: | |
196 | * Searches the unlabeled connection hash table and returns a pointer to the | |
197 | * interface entry which matches @ifindex, otherwise NULL is returned. The | |
b914f3a2 PM |
198 | * caller is responsible for ensuring that the hash table is protected with |
199 | * either a RCU read lock or the hash table lock. | |
8cc44579 PM |
200 | * |
201 | */ | |
202 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex) | |
203 | { | |
204 | u32 bkt; | |
56196701 | 205 | struct list_head *bkt_list; |
8cc44579 PM |
206 | struct netlbl_unlhsh_iface *iter; |
207 | ||
208 | bkt = netlbl_unlhsh_hash(ifindex); | |
b914f3a2 | 209 | bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]; |
56196701 | 210 | list_for_each_entry_rcu(iter, bkt_list, list) |
8cc44579 PM |
211 | if (iter->valid && iter->ifindex == ifindex) |
212 | return iter; | |
213 | ||
214 | return NULL; | |
215 | } | |
216 | ||
8cc44579 PM |
217 | /** |
218 | * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table | |
219 | * @iface: the associated interface entry | |
220 | * @addr: IPv4 address in network byte order | |
221 | * @mask: IPv4 address mask in network byte order | |
222 | * @secid: LSM secid value for entry | |
223 | * | |
224 | * Description: | |
225 | * Add a new address entry into the unlabeled connection hash table using the | |
226 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 227 | * a negative value is returned. |
8cc44579 | 228 | * |
32f50cde | 229 | */ |
8cc44579 PM |
230 | static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, |
231 | const struct in_addr *addr, | |
232 | const struct in_addr *mask, | |
233 | u32 secid) | |
234 | { | |
61e10682 | 235 | int ret_val; |
8cc44579 | 236 | struct netlbl_unlhsh_addr4 *entry; |
8cc44579 PM |
237 | |
238 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
239 | if (entry == NULL) | |
240 | return -ENOMEM; | |
241 | ||
61e10682 PM |
242 | entry->list.addr = addr->s_addr & mask->s_addr; |
243 | entry->list.mask = mask->s_addr; | |
244 | entry->list.valid = 1; | |
61e10682 | 245 | entry->secid = secid; |
8cc44579 PM |
246 | |
247 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 248 | ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); |
8cc44579 | 249 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
250 | |
251 | if (ret_val != 0) | |
252 | kfree(entry); | |
253 | return ret_val; | |
8cc44579 PM |
254 | } |
255 | ||
dfd56b8b | 256 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 PM |
257 | /** |
258 | * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table | |
259 | * @iface: the associated interface entry | |
260 | * @addr: IPv6 address in network byte order | |
261 | * @mask: IPv6 address mask in network byte order | |
262 | * @secid: LSM secid value for entry | |
263 | * | |
264 | * Description: | |
265 | * Add a new address entry into the unlabeled connection hash table using the | |
266 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 267 | * a negative value is returned. |
8cc44579 PM |
268 | * |
269 | */ | |
270 | static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, | |
271 | const struct in6_addr *addr, | |
272 | const struct in6_addr *mask, | |
273 | u32 secid) | |
274 | { | |
61e10682 | 275 | int ret_val; |
8cc44579 | 276 | struct netlbl_unlhsh_addr6 *entry; |
8cc44579 PM |
277 | |
278 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
279 | if (entry == NULL) | |
280 | return -ENOMEM; | |
281 | ||
4e3fd7a0 | 282 | entry->list.addr = *addr; |
61e10682 PM |
283 | entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; |
284 | entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; | |
285 | entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; | |
286 | entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; | |
4e3fd7a0 | 287 | entry->list.mask = *mask; |
61e10682 | 288 | entry->list.valid = 1; |
61e10682 | 289 | entry->secid = secid; |
8cc44579 PM |
290 | |
291 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 292 | ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); |
8cc44579 | 293 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
294 | |
295 | if (ret_val != 0) | |
296 | kfree(entry); | |
8cc44579 PM |
297 | return 0; |
298 | } | |
299 | #endif /* IPv6 */ | |
300 | ||
301 | /** | |
302 | * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table | |
303 | * @ifindex: network interface | |
304 | * | |
305 | * Description: | |
306 | * Add a new, empty, interface entry into the unlabeled connection hash table. | |
307 | * On success a pointer to the new interface entry is returned, on failure NULL | |
b914f3a2 | 308 | * is returned. |
8cc44579 PM |
309 | * |
310 | */ | |
311 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) | |
312 | { | |
313 | u32 bkt; | |
314 | struct netlbl_unlhsh_iface *iface; | |
315 | ||
316 | iface = kzalloc(sizeof(*iface), GFP_ATOMIC); | |
317 | if (iface == NULL) | |
318 | return NULL; | |
319 | ||
320 | iface->ifindex = ifindex; | |
321 | INIT_LIST_HEAD(&iface->addr4_list); | |
322 | INIT_LIST_HEAD(&iface->addr6_list); | |
323 | iface->valid = 1; | |
8cc44579 PM |
324 | |
325 | spin_lock(&netlbl_unlhsh_lock); | |
326 | if (ifindex > 0) { | |
327 | bkt = netlbl_unlhsh_hash(ifindex); | |
328 | if (netlbl_unlhsh_search_iface(ifindex) != NULL) | |
329 | goto add_iface_failure; | |
330 | list_add_tail_rcu(&iface->list, | |
b914f3a2 | 331 | &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]); |
8cc44579 PM |
332 | } else { |
333 | INIT_LIST_HEAD(&iface->list); | |
b914f3a2 | 334 | if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL) |
8cc44579 | 335 | goto add_iface_failure; |
cf778b00 | 336 | rcu_assign_pointer(netlbl_unlhsh_def, iface); |
8cc44579 PM |
337 | } |
338 | spin_unlock(&netlbl_unlhsh_lock); | |
339 | ||
340 | return iface; | |
341 | ||
342 | add_iface_failure: | |
343 | spin_unlock(&netlbl_unlhsh_lock); | |
344 | kfree(iface); | |
345 | return NULL; | |
346 | } | |
347 | ||
348 | /** | |
349 | * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table | |
350 | * @net: network namespace | |
351 | * @dev_name: interface name | |
352 | * @addr: IP address in network byte order | |
353 | * @mask: address mask in network byte order | |
354 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
355 | * @secid: LSM secid value for the entry | |
13541b3a | 356 | * @audit_info: NetLabel audit information |
8cc44579 PM |
357 | * |
358 | * Description: | |
359 | * Adds a new entry to the unlabeled connection hash table. Returns zero on | |
360 | * success, negative values on failure. | |
361 | * | |
362 | */ | |
6c2e8ac0 PM |
363 | int netlbl_unlhsh_add(struct net *net, |
364 | const char *dev_name, | |
365 | const void *addr, | |
366 | const void *mask, | |
367 | u32 addr_len, | |
368 | u32 secid, | |
369 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
370 | { |
371 | int ret_val; | |
372 | int ifindex; | |
373 | struct net_device *dev; | |
374 | struct netlbl_unlhsh_iface *iface; | |
13541b3a PM |
375 | struct audit_buffer *audit_buf = NULL; |
376 | char *secctx = NULL; | |
377 | u32 secctx_len; | |
8cc44579 PM |
378 | |
379 | if (addr_len != sizeof(struct in_addr) && | |
380 | addr_len != sizeof(struct in6_addr)) | |
381 | return -EINVAL; | |
382 | ||
383 | rcu_read_lock(); | |
384 | if (dev_name != NULL) { | |
122ec6ff | 385 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
386 | if (dev == NULL) { |
387 | ret_val = -ENODEV; | |
388 | goto unlhsh_add_return; | |
389 | } | |
390 | ifindex = dev->ifindex; | |
8cc44579 PM |
391 | iface = netlbl_unlhsh_search_iface(ifindex); |
392 | } else { | |
393 | ifindex = 0; | |
394 | iface = rcu_dereference(netlbl_unlhsh_def); | |
395 | } | |
396 | if (iface == NULL) { | |
397 | iface = netlbl_unlhsh_add_iface(ifindex); | |
398 | if (iface == NULL) { | |
399 | ret_val = -ENOMEM; | |
400 | goto unlhsh_add_return; | |
401 | } | |
402 | } | |
13541b3a PM |
403 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, |
404 | audit_info); | |
8cc44579 | 405 | switch (addr_len) { |
56628b1d | 406 | case sizeof(struct in_addr): { |
ea110733 JP |
407 | const struct in_addr *addr4 = addr; |
408 | const struct in_addr *mask4 = mask; | |
56628b1d | 409 | |
13541b3a PM |
410 | ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); |
411 | if (audit_buf != NULL) | |
63c41688 PM |
412 | netlbl_af4list_audit_addr(audit_buf, 1, |
413 | dev_name, | |
414 | addr4->s_addr, | |
415 | mask4->s_addr); | |
8cc44579 | 416 | break; |
56628b1d | 417 | } |
dfd56b8b | 418 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d | 419 | case sizeof(struct in6_addr): { |
ea110733 JP |
420 | const struct in6_addr *addr6 = addr; |
421 | const struct in6_addr *mask6 = mask; | |
56628b1d | 422 | |
13541b3a PM |
423 | ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); |
424 | if (audit_buf != NULL) | |
63c41688 PM |
425 | netlbl_af6list_audit_addr(audit_buf, 1, |
426 | dev_name, | |
427 | addr6, mask6); | |
8cc44579 | 428 | break; |
56628b1d | 429 | } |
8cc44579 PM |
430 | #endif /* IPv6 */ |
431 | default: | |
432 | ret_val = -EINVAL; | |
433 | } | |
434 | if (ret_val == 0) | |
435 | atomic_inc(&netlabel_mgmt_protocount); | |
436 | ||
437 | unlhsh_add_return: | |
438 | rcu_read_unlock(); | |
13541b3a PM |
439 | if (audit_buf != NULL) { |
440 | if (security_secid_to_secctx(secid, | |
441 | &secctx, | |
442 | &secctx_len) == 0) { | |
443 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
444 | security_release_secctx(secctx, secctx_len); | |
445 | } | |
446 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
447 | audit_log_end(audit_buf); | |
448 | } | |
8cc44579 PM |
449 | return ret_val; |
450 | } | |
451 | ||
452 | /** | |
453 | * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry | |
13541b3a | 454 | * @net: network namespace |
8cc44579 PM |
455 | * @iface: interface entry |
456 | * @addr: IP address | |
457 | * @mask: IP address mask | |
13541b3a | 458 | * @audit_info: NetLabel audit information |
8cc44579 PM |
459 | * |
460 | * Description: | |
461 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 462 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
463 | * |
464 | */ | |
13541b3a PM |
465 | static int netlbl_unlhsh_remove_addr4(struct net *net, |
466 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 467 | const struct in_addr *addr, |
13541b3a PM |
468 | const struct in_addr *mask, |
469 | struct netlbl_audit *audit_info) | |
8cc44579 | 470 | { |
61e10682 | 471 | struct netlbl_af4list *list_entry; |
8cc44579 | 472 | struct netlbl_unlhsh_addr4 *entry; |
61e10682 | 473 | struct audit_buffer *audit_buf; |
13541b3a | 474 | struct net_device *dev; |
61e10682 | 475 | char *secctx; |
13541b3a | 476 | u32 secctx_len; |
8cc44579 PM |
477 | |
478 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
479 | list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, |
480 | &iface->addr4_list); | |
8cc44579 | 481 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
482 | if (list_entry != NULL) |
483 | entry = netlbl_unlhsh_addr4_entry(list_entry); | |
484 | else | |
ec8f2375 | 485 | entry = NULL; |
8cc44579 | 486 | |
13541b3a PM |
487 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
488 | audit_info); | |
489 | if (audit_buf != NULL) { | |
490 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
491 | netlbl_af4list_audit_addr(audit_buf, 1, |
492 | (dev != NULL ? dev->name : NULL), | |
493 | addr->s_addr, mask->s_addr); | |
13541b3a PM |
494 | if (dev != NULL) |
495 | dev_put(dev); | |
ec8f2375 PM |
496 | if (entry != NULL && |
497 | security_secid_to_secctx(entry->secid, | |
498 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
499 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
500 | security_release_secctx(secctx, secctx_len); | |
501 | } | |
ec8f2375 | 502 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
503 | audit_log_end(audit_buf); |
504 | } | |
505 | ||
ec8f2375 PM |
506 | if (entry == NULL) |
507 | return -ENOENT; | |
508 | ||
c3b49420 | 509 | kfree_rcu(entry, rcu); |
ec8f2375 | 510 | return 0; |
8cc44579 PM |
511 | } |
512 | ||
dfd56b8b | 513 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 PM |
514 | /** |
515 | * netlbl_unlhsh_remove_addr6 - Remove an IPv6 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_addr6(struct net *net, |
528 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 529 | const struct in6_addr *addr, |
13541b3a PM |
530 | const struct in6_addr *mask, |
531 | struct netlbl_audit *audit_info) | |
8cc44579 | 532 | { |
61e10682 | 533 | struct netlbl_af6list *list_entry; |
8cc44579 | 534 | struct netlbl_unlhsh_addr6 *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 | 541 | list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); |
8cc44579 | 542 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
543 | if (list_entry != NULL) |
544 | entry = netlbl_unlhsh_addr6_entry(list_entry); | |
545 | else | |
ec8f2375 | 546 | entry = NULL; |
8cc44579 | 547 | |
13541b3a PM |
548 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
549 | audit_info); | |
550 | if (audit_buf != NULL) { | |
551 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
552 | netlbl_af6list_audit_addr(audit_buf, 1, |
553 | (dev != NULL ? dev->name : NULL), | |
554 | addr, mask); | |
13541b3a PM |
555 | if (dev != NULL) |
556 | dev_put(dev); | |
ec8f2375 PM |
557 | if (entry != NULL && |
558 | security_secid_to_secctx(entry->secid, | |
559 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
560 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
561 | security_release_secctx(secctx, secctx_len); | |
562 | } | |
ec8f2375 | 563 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
564 | audit_log_end(audit_buf); |
565 | } | |
566 | ||
ec8f2375 PM |
567 | if (entry == NULL) |
568 | return -ENOENT; | |
569 | ||
6b262232 | 570 | kfree_rcu(entry, rcu); |
ec8f2375 | 571 | return 0; |
8cc44579 PM |
572 | } |
573 | #endif /* IPv6 */ | |
574 | ||
575 | /** | |
576 | * netlbl_unlhsh_condremove_iface - Remove an interface entry | |
577 | * @iface: the interface entry | |
578 | * | |
579 | * Description: | |
580 | * Remove an interface entry from the unlabeled connection hash table if it is | |
581 | * empty. An interface entry is considered to be empty if there are no | |
582 | * address entries assigned to it. | |
583 | * | |
584 | */ | |
585 | static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) | |
586 | { | |
61e10682 | 587 | struct netlbl_af4list *iter4; |
dfd56b8b | 588 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
589 | struct netlbl_af6list *iter6; |
590 | #endif /* IPv6 */ | |
8cc44579 PM |
591 | |
592 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
593 | netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list) |
594 | goto unlhsh_condremove_failure; | |
dfd56b8b | 595 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
596 | netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list) |
597 | goto unlhsh_condremove_failure; | |
598 | #endif /* IPv6 */ | |
8cc44579 PM |
599 | iface->valid = 0; |
600 | if (iface->ifindex > 0) | |
601 | list_del_rcu(&iface->list); | |
602 | else | |
a9b3cd7f | 603 | RCU_INIT_POINTER(netlbl_unlhsh_def, NULL); |
8cc44579 PM |
604 | spin_unlock(&netlbl_unlhsh_lock); |
605 | ||
606 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
607 | return; | |
608 | ||
609 | unlhsh_condremove_failure: | |
610 | spin_unlock(&netlbl_unlhsh_lock); | |
8cc44579 PM |
611 | } |
612 | ||
613 | /** | |
614 | * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table | |
615 | * @net: network namespace | |
616 | * @dev_name: interface name | |
617 | * @addr: IP address in network byte order | |
618 | * @mask: address mask in network byte order | |
619 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
13541b3a | 620 | * @audit_info: NetLabel audit information |
8cc44579 PM |
621 | * |
622 | * Description: | |
623 | * Removes and existing entry from the unlabeled connection hash table. | |
624 | * Returns zero on success, negative values on failure. | |
625 | * | |
626 | */ | |
6c2e8ac0 PM |
627 | int netlbl_unlhsh_remove(struct net *net, |
628 | const char *dev_name, | |
629 | const void *addr, | |
630 | const void *mask, | |
631 | u32 addr_len, | |
632 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
633 | { |
634 | int ret_val; | |
635 | struct net_device *dev; | |
636 | struct netlbl_unlhsh_iface *iface; | |
637 | ||
638 | if (addr_len != sizeof(struct in_addr) && | |
639 | addr_len != sizeof(struct in6_addr)) | |
640 | return -EINVAL; | |
641 | ||
642 | rcu_read_lock(); | |
643 | if (dev_name != NULL) { | |
122ec6ff | 644 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
645 | if (dev == NULL) { |
646 | ret_val = -ENODEV; | |
647 | goto unlhsh_remove_return; | |
648 | } | |
649 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
8cc44579 PM |
650 | } else |
651 | iface = rcu_dereference(netlbl_unlhsh_def); | |
652 | if (iface == NULL) { | |
653 | ret_val = -ENOENT; | |
654 | goto unlhsh_remove_return; | |
655 | } | |
656 | switch (addr_len) { | |
657 | case sizeof(struct in_addr): | |
13541b3a PM |
658 | ret_val = netlbl_unlhsh_remove_addr4(net, |
659 | iface, addr, mask, | |
660 | audit_info); | |
8cc44579 | 661 | break; |
dfd56b8b | 662 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 | 663 | case sizeof(struct in6_addr): |
13541b3a PM |
664 | ret_val = netlbl_unlhsh_remove_addr6(net, |
665 | iface, addr, mask, | |
666 | audit_info); | |
8cc44579 PM |
667 | break; |
668 | #endif /* IPv6 */ | |
669 | default: | |
670 | ret_val = -EINVAL; | |
671 | } | |
672 | if (ret_val == 0) { | |
673 | netlbl_unlhsh_condremove_iface(iface); | |
674 | atomic_dec(&netlabel_mgmt_protocount); | |
675 | } | |
676 | ||
677 | unlhsh_remove_return: | |
678 | rcu_read_unlock(); | |
679 | return ret_val; | |
680 | } | |
681 | ||
682 | /* | |
683 | * General Helper Functions | |
684 | */ | |
685 | ||
686 | /** | |
687 | * netlbl_unlhsh_netdev_handler - Network device notification handler | |
688 | * @this: notifier block | |
689 | * @event: the event | |
351638e7 | 690 | * @ptr: the netdevice notifier info (cast to void) |
8cc44579 PM |
691 | * |
692 | * Description: | |
693 | * Handle network device events, although at present all we care about is a | |
694 | * network device going away. In the case of a device going away we clear any | |
695 | * related entries from the unlabeled connection hash table. | |
696 | * | |
697 | */ | |
698 | static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, | |
351638e7 | 699 | unsigned long event, void *ptr) |
8cc44579 | 700 | { |
351638e7 | 701 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
8cc44579 PM |
702 | struct netlbl_unlhsh_iface *iface = NULL; |
703 | ||
721499e8 | 704 | if (!net_eq(dev_net(dev), &init_net)) |
8cc44579 PM |
705 | return NOTIFY_DONE; |
706 | ||
707 | /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ | |
708 | if (event == NETDEV_DOWN) { | |
709 | spin_lock(&netlbl_unlhsh_lock); | |
710 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
711 | if (iface != NULL && iface->valid) { | |
712 | iface->valid = 0; | |
713 | list_del_rcu(&iface->list); | |
714 | } else | |
715 | iface = NULL; | |
716 | spin_unlock(&netlbl_unlhsh_lock); | |
717 | } | |
718 | ||
719 | if (iface != NULL) | |
720 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
721 | ||
722 | return NOTIFY_DONE; | |
723 | } | |
32f50cde PM |
724 | |
725 | /** | |
726 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
727 | * @value: desired value | |
95d4e6be | 728 | * @audit_info: NetLabel audit information |
32f50cde PM |
729 | * |
730 | * Description: | |
731 | * Set the value of the unlabeled accept flag to @value. | |
732 | * | |
733 | */ | |
95d4e6be PM |
734 | static void netlbl_unlabel_acceptflg_set(u8 value, |
735 | struct netlbl_audit *audit_info) | |
32f50cde | 736 | { |
95d4e6be PM |
737 | struct audit_buffer *audit_buf; |
738 | u8 old_val; | |
739 | ||
4be2700f | 740 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 741 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
742 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
743 | audit_info); | |
de64688f PM |
744 | if (audit_buf != NULL) { |
745 | audit_log_format(audit_buf, | |
746 | " unlbl_accept=%u old=%u", value, old_val); | |
747 | audit_log_end(audit_buf); | |
748 | } | |
32f50cde PM |
749 | } |
750 | ||
8cc44579 PM |
751 | /** |
752 | * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information | |
753 | * @info: the Generic NETLINK info block | |
754 | * @addr: the IP address | |
755 | * @mask: the IP address mask | |
756 | * @len: the address length | |
757 | * | |
758 | * Description: | |
759 | * Examine the Generic NETLINK message and extract the IP address information. | |
760 | * Returns zero on success, negative values on failure. | |
761 | * | |
762 | */ | |
763 | static int netlbl_unlabel_addrinfo_get(struct genl_info *info, | |
764 | void **addr, | |
765 | void **mask, | |
766 | u32 *len) | |
767 | { | |
768 | u32 addr_len; | |
769 | ||
f88b4c01 ST |
770 | if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR] && |
771 | info->attrs[NLBL_UNLABEL_A_IPV4MASK]) { | |
8cc44579 PM |
772 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); |
773 | if (addr_len != sizeof(struct in_addr) && | |
774 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) | |
775 | return -EINVAL; | |
776 | *len = addr_len; | |
777 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
778 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); | |
779 | return 0; | |
780 | } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { | |
781 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
782 | if (addr_len != sizeof(struct in6_addr) && | |
783 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) | |
784 | return -EINVAL; | |
785 | *len = addr_len; | |
786 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
787 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); | |
788 | return 0; | |
789 | } | |
790 | ||
791 | return -EINVAL; | |
792 | } | |
793 | ||
96cb8e33 PM |
794 | /* |
795 | * NetLabel Command Handlers | |
796 | */ | |
797 | ||
798 | /** | |
799 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
800 | * @skb: the NETLINK buffer | |
801 | * @info: the Generic NETLINK info block | |
802 | * | |
803 | * Description: | |
804 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
805 | * Returns zero on success, negative values on failure. | |
806 | * | |
807 | */ | |
808 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
809 | { | |
fd385855 | 810 | u8 value; |
95d4e6be | 811 | struct netlbl_audit audit_info; |
96cb8e33 | 812 | |
fd385855 PM |
813 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
814 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 815 | if (value == 1 || value == 0) { |
95d4e6be PM |
816 | netlbl_netlink_auditinfo(skb, &audit_info); |
817 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 818 | return 0; |
96cb8e33 PM |
819 | } |
820 | } | |
821 | ||
32f50cde | 822 | return -EINVAL; |
96cb8e33 PM |
823 | } |
824 | ||
825 | /** | |
826 | * netlbl_unlabel_list - Handle a LIST message | |
827 | * @skb: the NETLINK buffer | |
828 | * @info: the Generic NETLINK info block | |
829 | * | |
830 | * Description: | |
831 | * Process a user generated LIST message and respond with the current status. | |
832 | * Returns zero on success, negative values on failure. | |
833 | * | |
834 | */ | |
835 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
836 | { | |
fd385855 | 837 | int ret_val = -EINVAL; |
96cb8e33 | 838 | struct sk_buff *ans_skb; |
fd385855 | 839 | void *data; |
96cb8e33 | 840 | |
339bf98f | 841 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
842 | if (ans_skb == NULL) |
843 | goto list_failure; | |
17c157c8 TG |
844 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
845 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
846 | if (data == NULL) { |
847 | ret_val = -ENOMEM; | |
96cb8e33 | 848 | goto list_failure; |
fd385855 | 849 | } |
96cb8e33 | 850 | |
fd385855 PM |
851 | ret_val = nla_put_u8(ans_skb, |
852 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 853 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
854 | if (ret_val != 0) |
855 | goto list_failure; | |
856 | ||
fd385855 | 857 | genlmsg_end(ans_skb, data); |
fe785bee | 858 | return genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
859 | |
860 | list_failure: | |
b08d5840 | 861 | kfree_skb(ans_skb); |
96cb8e33 PM |
862 | return ret_val; |
863 | } | |
864 | ||
8cc44579 PM |
865 | /** |
866 | * netlbl_unlabel_staticadd - Handle a STATICADD message | |
867 | * @skb: the NETLINK buffer | |
868 | * @info: the Generic NETLINK info block | |
869 | * | |
870 | * Description: | |
871 | * Process a user generated STATICADD message and add a new unlabeled | |
872 | * connection entry to the hash table. Returns zero on success, negative | |
873 | * values on failure. | |
874 | * | |
875 | */ | |
876 | static int netlbl_unlabel_staticadd(struct sk_buff *skb, | |
877 | struct genl_info *info) | |
878 | { | |
879 | int ret_val; | |
880 | char *dev_name; | |
881 | void *addr; | |
882 | void *mask; | |
883 | u32 addr_len; | |
884 | u32 secid; | |
13541b3a | 885 | struct netlbl_audit audit_info; |
8cc44579 PM |
886 | |
887 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
888 | * single entry. However, allow users to create two entries, one each | |
889 | * for IPv4 and IPv4, with the same LSM security context which should | |
890 | * achieve the same result. */ | |
891 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
892 | !info->attrs[NLBL_UNLABEL_A_IFACE] || | |
893 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
894 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
895 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
896 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
897 | return -EINVAL; | |
898 | ||
13541b3a PM |
899 | netlbl_netlink_auditinfo(skb, &audit_info); |
900 | ||
8cc44579 PM |
901 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
902 | if (ret_val != 0) | |
903 | return ret_val; | |
904 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
905 | ret_val = security_secctx_to_secid( | |
906 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
907 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
908 | &secid); | |
909 | if (ret_val != 0) | |
910 | return ret_val; | |
911 | ||
912 | return netlbl_unlhsh_add(&init_net, | |
13541b3a PM |
913 | dev_name, addr, mask, addr_len, secid, |
914 | &audit_info); | |
8cc44579 PM |
915 | } |
916 | ||
917 | /** | |
918 | * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message | |
919 | * @skb: the NETLINK buffer | |
920 | * @info: the Generic NETLINK info block | |
921 | * | |
922 | * Description: | |
923 | * Process a user generated STATICADDDEF message and add a new default | |
924 | * unlabeled connection entry. Returns zero on success, negative values on | |
925 | * failure. | |
926 | * | |
927 | */ | |
928 | static int netlbl_unlabel_staticadddef(struct sk_buff *skb, | |
929 | struct genl_info *info) | |
930 | { | |
931 | int ret_val; | |
932 | void *addr; | |
933 | void *mask; | |
934 | u32 addr_len; | |
935 | u32 secid; | |
13541b3a | 936 | struct netlbl_audit audit_info; |
8cc44579 PM |
937 | |
938 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
939 | * single entry. However, allow users to create two entries, one each | |
940 | * for IPv4 and IPv6, with the same LSM security context which should | |
941 | * achieve the same result. */ | |
942 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
943 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
944 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
945 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
946 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
947 | return -EINVAL; | |
948 | ||
13541b3a PM |
949 | netlbl_netlink_auditinfo(skb, &audit_info); |
950 | ||
8cc44579 PM |
951 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
952 | if (ret_val != 0) | |
953 | return ret_val; | |
954 | ret_val = security_secctx_to_secid( | |
955 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
956 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
957 | &secid); | |
958 | if (ret_val != 0) | |
959 | return ret_val; | |
960 | ||
13541b3a PM |
961 | return netlbl_unlhsh_add(&init_net, |
962 | NULL, addr, mask, addr_len, secid, | |
963 | &audit_info); | |
8cc44579 PM |
964 | } |
965 | ||
966 | /** | |
967 | * netlbl_unlabel_staticremove - Handle a STATICREMOVE message | |
968 | * @skb: the NETLINK buffer | |
969 | * @info: the Generic NETLINK info block | |
970 | * | |
971 | * Description: | |
972 | * Process a user generated STATICREMOVE message and remove the specified | |
973 | * unlabeled connection entry. Returns zero on success, negative values on | |
974 | * failure. | |
975 | * | |
976 | */ | |
977 | static int netlbl_unlabel_staticremove(struct sk_buff *skb, | |
978 | struct genl_info *info) | |
979 | { | |
980 | int ret_val; | |
981 | char *dev_name; | |
982 | void *addr; | |
983 | void *mask; | |
984 | u32 addr_len; | |
13541b3a | 985 | struct netlbl_audit audit_info; |
8cc44579 PM |
986 | |
987 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
988 | * IPv4 and IPv6 in the same entry. */ | |
989 | if (!info->attrs[NLBL_UNLABEL_A_IFACE] || | |
990 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
991 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
992 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
993 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
994 | return -EINVAL; | |
995 | ||
13541b3a PM |
996 | netlbl_netlink_auditinfo(skb, &audit_info); |
997 | ||
8cc44579 PM |
998 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
999 | if (ret_val != 0) | |
1000 | return ret_val; | |
1001 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1002 | ||
13541b3a PM |
1003 | return netlbl_unlhsh_remove(&init_net, |
1004 | dev_name, addr, mask, addr_len, | |
1005 | &audit_info); | |
8cc44579 PM |
1006 | } |
1007 | ||
1008 | /** | |
1009 | * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message | |
1010 | * @skb: the NETLINK buffer | |
1011 | * @info: the Generic NETLINK info block | |
1012 | * | |
1013 | * Description: | |
1014 | * Process a user generated STATICREMOVEDEF message and remove the default | |
1015 | * unlabeled connection entry. Returns zero on success, negative values on | |
1016 | * failure. | |
1017 | * | |
1018 | */ | |
1019 | static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, | |
1020 | struct genl_info *info) | |
1021 | { | |
1022 | int ret_val; | |
1023 | void *addr; | |
1024 | void *mask; | |
1025 | u32 addr_len; | |
13541b3a | 1026 | struct netlbl_audit audit_info; |
8cc44579 PM |
1027 | |
1028 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1029 | * IPv4 and IPv6 in the same entry. */ | |
1030 | if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1031 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1032 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1033 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1034 | return -EINVAL; | |
1035 | ||
13541b3a PM |
1036 | netlbl_netlink_auditinfo(skb, &audit_info); |
1037 | ||
8cc44579 PM |
1038 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1039 | if (ret_val != 0) | |
1040 | return ret_val; | |
1041 | ||
13541b3a PM |
1042 | return netlbl_unlhsh_remove(&init_net, |
1043 | NULL, addr, mask, addr_len, | |
1044 | &audit_info); | |
8cc44579 PM |
1045 | } |
1046 | ||
1047 | ||
1048 | /** | |
1049 | * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] | |
1050 | * @cmd: command/message | |
1051 | * @iface: the interface entry | |
1052 | * @addr4: the IPv4 address entry | |
1053 | * @addr6: the IPv6 address entry | |
1054 | * @arg: the netlbl_unlhsh_walk_arg structure | |
1055 | * | |
1056 | * Description: | |
1057 | * This function is designed to be used to generate a response for a | |
1058 | * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 | |
1059 | * can be specified, not both, the other unspecified entry should be set to | |
1060 | * NULL by the caller. Returns the size of the message on success, negative | |
1061 | * values on failure. | |
1062 | * | |
1063 | */ | |
1064 | static int netlbl_unlabel_staticlist_gen(u32 cmd, | |
1065 | const struct netlbl_unlhsh_iface *iface, | |
1066 | const struct netlbl_unlhsh_addr4 *addr4, | |
1067 | const struct netlbl_unlhsh_addr6 *addr6, | |
1068 | void *arg) | |
1069 | { | |
1070 | int ret_val = -ENOMEM; | |
1071 | struct netlbl_unlhsh_walk_arg *cb_arg = arg; | |
1072 | struct net_device *dev; | |
1073 | void *data; | |
1074 | u32 secid; | |
1075 | char *secctx; | |
1076 | u32 secctx_len; | |
1077 | ||
15e47304 | 1078 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, |
8cc44579 PM |
1079 | cb_arg->seq, &netlbl_unlabel_gnl_family, |
1080 | NLM_F_MULTI, cmd); | |
1081 | if (data == NULL) | |
1082 | goto list_cb_failure; | |
1083 | ||
1084 | if (iface->ifindex > 0) { | |
1085 | dev = dev_get_by_index(&init_net, iface->ifindex); | |
794eb6bf JJ |
1086 | if (!dev) { |
1087 | ret_val = -ENODEV; | |
1088 | goto list_cb_failure; | |
1089 | } | |
8cc44579 PM |
1090 | ret_val = nla_put_string(cb_arg->skb, |
1091 | NLBL_UNLABEL_A_IFACE, dev->name); | |
1092 | dev_put(dev); | |
1093 | if (ret_val != 0) | |
1094 | goto list_cb_failure; | |
1095 | } | |
1096 | ||
1097 | if (addr4) { | |
1098 | struct in_addr addr_struct; | |
1099 | ||
61e10682 | 1100 | addr_struct.s_addr = addr4->list.addr; |
930345ea JB |
1101 | ret_val = nla_put_in_addr(cb_arg->skb, |
1102 | NLBL_UNLABEL_A_IPV4ADDR, | |
1103 | addr_struct.s_addr); | |
8cc44579 PM |
1104 | if (ret_val != 0) |
1105 | goto list_cb_failure; | |
1106 | ||
61e10682 | 1107 | addr_struct.s_addr = addr4->list.mask; |
930345ea JB |
1108 | ret_val = nla_put_in_addr(cb_arg->skb, |
1109 | NLBL_UNLABEL_A_IPV4MASK, | |
1110 | addr_struct.s_addr); | |
8cc44579 PM |
1111 | if (ret_val != 0) |
1112 | goto list_cb_failure; | |
1113 | ||
1114 | secid = addr4->secid; | |
1115 | } else { | |
930345ea JB |
1116 | ret_val = nla_put_in6_addr(cb_arg->skb, |
1117 | NLBL_UNLABEL_A_IPV6ADDR, | |
1118 | &addr6->list.addr); | |
8cc44579 PM |
1119 | if (ret_val != 0) |
1120 | goto list_cb_failure; | |
1121 | ||
930345ea JB |
1122 | ret_val = nla_put_in6_addr(cb_arg->skb, |
1123 | NLBL_UNLABEL_A_IPV6MASK, | |
1124 | &addr6->list.mask); | |
8cc44579 PM |
1125 | if (ret_val != 0) |
1126 | goto list_cb_failure; | |
1127 | ||
1128 | secid = addr6->secid; | |
1129 | } | |
1130 | ||
1131 | ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); | |
1132 | if (ret_val != 0) | |
1133 | goto list_cb_failure; | |
1134 | ret_val = nla_put(cb_arg->skb, | |
1135 | NLBL_UNLABEL_A_SECCTX, | |
1136 | secctx_len, | |
1137 | secctx); | |
1138 | security_release_secctx(secctx, secctx_len); | |
1139 | if (ret_val != 0) | |
1140 | goto list_cb_failure; | |
1141 | ||
1142 | cb_arg->seq++; | |
053c095a JB |
1143 | genlmsg_end(cb_arg->skb, data); |
1144 | return 0; | |
8cc44579 PM |
1145 | |
1146 | list_cb_failure: | |
1147 | genlmsg_cancel(cb_arg->skb, data); | |
1148 | return ret_val; | |
1149 | } | |
1150 | ||
1151 | /** | |
1152 | * netlbl_unlabel_staticlist - Handle a STATICLIST message | |
1153 | * @skb: the NETLINK buffer | |
1154 | * @cb: the NETLINK callback | |
1155 | * | |
1156 | * Description: | |
1157 | * Process a user generated STATICLIST message and dump the unlabeled | |
1158 | * connection hash table in a form suitable for use in a kernel generated | |
1159 | * STATICLIST message. Returns the length of @skb. | |
1160 | * | |
1161 | */ | |
1162 | static int netlbl_unlabel_staticlist(struct sk_buff *skb, | |
1163 | struct netlink_callback *cb) | |
1164 | { | |
1165 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1166 | u32 skip_bkt = cb->args[0]; | |
1167 | u32 skip_chain = cb->args[1]; | |
8cc44579 PM |
1168 | u32 iter_bkt; |
1169 | u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; | |
1170 | struct netlbl_unlhsh_iface *iface; | |
56196701 | 1171 | struct list_head *iter_list; |
61e10682 | 1172 | struct netlbl_af4list *addr4; |
dfd56b8b | 1173 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1174 | struct netlbl_af6list *addr6; |
1175 | #endif | |
8cc44579 PM |
1176 | |
1177 | cb_arg.nl_cb = cb; | |
1178 | cb_arg.skb = skb; | |
1179 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1180 | ||
1181 | rcu_read_lock(); | |
1182 | for (iter_bkt = skip_bkt; | |
1183 | iter_bkt < rcu_dereference(netlbl_unlhsh)->size; | |
1184 | iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) { | |
56196701 PM |
1185 | iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; |
1186 | list_for_each_entry_rcu(iface, iter_list, list) { | |
8cc44579 PM |
1187 | if (!iface->valid || |
1188 | iter_chain++ < skip_chain) | |
1189 | continue; | |
61e10682 PM |
1190 | netlbl_af4list_foreach_rcu(addr4, |
1191 | &iface->addr4_list) { | |
a6a8fe95 | 1192 | if (iter_addr4++ < cb->args[2]) |
8cc44579 PM |
1193 | continue; |
1194 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1195 | NLBL_UNLABEL_C_STATICLIST, |
1196 | iface, | |
1197 | netlbl_unlhsh_addr4_entry(addr4), | |
1198 | NULL, | |
1199 | &cb_arg) < 0) { | |
8cc44579 PM |
1200 | iter_addr4--; |
1201 | iter_chain--; | |
1202 | goto unlabel_staticlist_return; | |
1203 | } | |
1204 | } | |
dfd56b8b | 1205 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1206 | netlbl_af6list_foreach_rcu(addr6, |
1207 | &iface->addr6_list) { | |
a6a8fe95 | 1208 | if (iter_addr6++ < cb->args[3]) |
8cc44579 PM |
1209 | continue; |
1210 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1211 | NLBL_UNLABEL_C_STATICLIST, |
1212 | iface, | |
1213 | NULL, | |
1214 | netlbl_unlhsh_addr6_entry(addr6), | |
1215 | &cb_arg) < 0) { | |
8cc44579 PM |
1216 | iter_addr6--; |
1217 | iter_chain--; | |
1218 | goto unlabel_staticlist_return; | |
1219 | } | |
1220 | } | |
61e10682 | 1221 | #endif /* IPv6 */ |
8cc44579 PM |
1222 | } |
1223 | } | |
1224 | ||
1225 | unlabel_staticlist_return: | |
1226 | rcu_read_unlock(); | |
0c1233ab PM |
1227 | cb->args[0] = iter_bkt; |
1228 | cb->args[1] = iter_chain; | |
1229 | cb->args[2] = iter_addr4; | |
1230 | cb->args[3] = iter_addr6; | |
8cc44579 PM |
1231 | return skb->len; |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message | |
1236 | * @skb: the NETLINK buffer | |
1237 | * @cb: the NETLINK callback | |
1238 | * | |
1239 | * Description: | |
1240 | * Process a user generated STATICLISTDEF message and dump the default | |
1241 | * unlabeled connection entry in a form suitable for use in a kernel generated | |
1242 | * STATICLISTDEF message. Returns the length of @skb. | |
1243 | * | |
1244 | */ | |
1245 | static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, | |
1246 | struct netlink_callback *cb) | |
1247 | { | |
1248 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1249 | struct netlbl_unlhsh_iface *iface; | |
a6a8fe95 | 1250 | u32 iter_addr4 = 0, iter_addr6 = 0; |
61e10682 | 1251 | struct netlbl_af4list *addr4; |
dfd56b8b | 1252 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1253 | struct netlbl_af6list *addr6; |
1254 | #endif | |
8cc44579 PM |
1255 | |
1256 | cb_arg.nl_cb = cb; | |
1257 | cb_arg.skb = skb; | |
1258 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1259 | ||
1260 | rcu_read_lock(); | |
1261 | iface = rcu_dereference(netlbl_unlhsh_def); | |
1262 | if (iface == NULL || !iface->valid) | |
1263 | goto unlabel_staticlistdef_return; | |
1264 | ||
61e10682 | 1265 | netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
a6a8fe95 | 1266 | if (iter_addr4++ < cb->args[0]) |
8cc44579 PM |
1267 | continue; |
1268 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1269 | iface, |
1270 | netlbl_unlhsh_addr4_entry(addr4), | |
1271 | NULL, | |
1272 | &cb_arg) < 0) { | |
8cc44579 PM |
1273 | iter_addr4--; |
1274 | goto unlabel_staticlistdef_return; | |
1275 | } | |
1276 | } | |
dfd56b8b | 1277 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 | 1278 | netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { |
a6a8fe95 | 1279 | if (iter_addr6++ < cb->args[1]) |
8cc44579 PM |
1280 | continue; |
1281 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1282 | iface, |
1283 | NULL, | |
1284 | netlbl_unlhsh_addr6_entry(addr6), | |
1285 | &cb_arg) < 0) { | |
8cc44579 PM |
1286 | iter_addr6--; |
1287 | goto unlabel_staticlistdef_return; | |
1288 | } | |
1289 | } | |
61e10682 | 1290 | #endif /* IPv6 */ |
8cc44579 PM |
1291 | |
1292 | unlabel_staticlistdef_return: | |
1293 | rcu_read_unlock(); | |
0c1233ab PM |
1294 | cb->args[0] = iter_addr4; |
1295 | cb->args[1] = iter_addr6; | |
8cc44579 PM |
1296 | return skb->len; |
1297 | } | |
96cb8e33 PM |
1298 | |
1299 | /* | |
1300 | * NetLabel Generic NETLINK Command Definitions | |
1301 | */ | |
1302 | ||
4534de83 | 1303 | static const struct genl_ops netlbl_unlabel_genl_ops[] = { |
227c43c3 | 1304 | { |
8cc44579 | 1305 | .cmd = NLBL_UNLABEL_C_STATICADD, |
ef6243ac | 1306 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1307 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1308 | .doit = netlbl_unlabel_staticadd, |
1309 | .dumpit = NULL, | |
227c43c3 PE |
1310 | }, |
1311 | { | |
8cc44579 | 1312 | .cmd = NLBL_UNLABEL_C_STATICREMOVE, |
ef6243ac | 1313 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1314 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1315 | .doit = netlbl_unlabel_staticremove, |
1316 | .dumpit = NULL, | |
227c43c3 PE |
1317 | }, |
1318 | { | |
8cc44579 | 1319 | .cmd = NLBL_UNLABEL_C_STATICLIST, |
ef6243ac | 1320 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1321 | .flags = 0, |
8cc44579 PM |
1322 | .doit = NULL, |
1323 | .dumpit = netlbl_unlabel_staticlist, | |
227c43c3 PE |
1324 | }, |
1325 | { | |
8cc44579 | 1326 | .cmd = NLBL_UNLABEL_C_STATICADDDEF, |
ef6243ac | 1327 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1328 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1329 | .doit = netlbl_unlabel_staticadddef, |
1330 | .dumpit = NULL, | |
227c43c3 PE |
1331 | }, |
1332 | { | |
8cc44579 | 1333 | .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, |
ef6243ac | 1334 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1335 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1336 | .doit = netlbl_unlabel_staticremovedef, |
1337 | .dumpit = NULL, | |
227c43c3 PE |
1338 | }, |
1339 | { | |
8cc44579 | 1340 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
ef6243ac | 1341 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1342 | .flags = 0, |
8cc44579 PM |
1343 | .doit = NULL, |
1344 | .dumpit = netlbl_unlabel_staticlistdef, | |
227c43c3 PE |
1345 | }, |
1346 | { | |
96cb8e33 | 1347 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
ef6243ac | 1348 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
fd385855 | 1349 | .flags = GENL_ADMIN_PERM, |
96cb8e33 PM |
1350 | .doit = netlbl_unlabel_accept, |
1351 | .dumpit = NULL, | |
227c43c3 PE |
1352 | }, |
1353 | { | |
96cb8e33 | 1354 | .cmd = NLBL_UNLABEL_C_LIST, |
ef6243ac | 1355 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
96cb8e33 PM |
1356 | .flags = 0, |
1357 | .doit = netlbl_unlabel_list, | |
1358 | .dumpit = NULL, | |
227c43c3 | 1359 | }, |
96cb8e33 PM |
1360 | }; |
1361 | ||
56989f6d | 1362 | static struct genl_family netlbl_unlabel_gnl_family __ro_after_init = { |
489111e5 JB |
1363 | .hdrsize = 0, |
1364 | .name = NETLBL_NLTYPE_UNLABELED_NAME, | |
1365 | .version = NETLBL_PROTO_VERSION, | |
1366 | .maxattr = NLBL_UNLABEL_A_MAX, | |
3b0f31f2 | 1367 | .policy = netlbl_unlabel_genl_policy, |
489111e5 JB |
1368 | .module = THIS_MODULE, |
1369 | .ops = netlbl_unlabel_genl_ops, | |
1370 | .n_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops), | |
1371 | }; | |
1372 | ||
96cb8e33 PM |
1373 | /* |
1374 | * NetLabel Generic NETLINK Protocol Functions | |
1375 | */ | |
1376 | ||
1377 | /** | |
1378 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
1379 | * | |
1380 | * Description: | |
1381 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
1382 | * mechanism. Returns zero on success, negative values on failure. | |
1383 | * | |
1384 | */ | |
05705e4e | 1385 | int __init netlbl_unlabel_genl_init(void) |
96cb8e33 | 1386 | { |
489111e5 | 1387 | return genl_register_family(&netlbl_unlabel_gnl_family); |
96cb8e33 PM |
1388 | } |
1389 | ||
1390 | /* | |
1391 | * NetLabel KAPI Hooks | |
1392 | */ | |
1393 | ||
8cc44579 PM |
1394 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1395 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1396 | }; | |
1397 | ||
1398 | /** | |
1399 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1400 | * @size: the number of bits to use for the hash buckets | |
1401 | * | |
1402 | * Description: | |
1403 | * Initializes the unlabeled connection hash table and registers a network | |
1404 | * device notification handler. This function should only be called by the | |
1405 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1406 | * non-zero values on error. | |
1407 | * | |
1408 | */ | |
05705e4e | 1409 | int __init netlbl_unlabel_init(u32 size) |
8cc44579 PM |
1410 | { |
1411 | u32 iter; | |
1412 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1413 | ||
1414 | if (size == 0) | |
1415 | return -EINVAL; | |
1416 | ||
1417 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1418 | if (hsh_tbl == NULL) | |
1419 | return -ENOMEM; | |
1420 | hsh_tbl->size = 1 << size; | |
1421 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1422 | sizeof(struct list_head), | |
1423 | GFP_KERNEL); | |
1424 | if (hsh_tbl->tbl == NULL) { | |
1425 | kfree(hsh_tbl); | |
1426 | return -ENOMEM; | |
1427 | } | |
1428 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1429 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1430 | ||
8cc44579 | 1431 | spin_lock(&netlbl_unlhsh_lock); |
cf778b00 | 1432 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); |
8cc44579 | 1433 | spin_unlock(&netlbl_unlhsh_lock); |
8cc44579 PM |
1434 | |
1435 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1436 | ||
1437 | return 0; | |
1438 | } | |
1439 | ||
96cb8e33 PM |
1440 | /** |
1441 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1442 | * @skb: the packet |
1443 | * @family: protocol family | |
96cb8e33 PM |
1444 | * @secattr: the security attributes |
1445 | * | |
1446 | * Description: | |
1447 | * Determine the security attributes, if any, for an unlabled packet and return | |
1448 | * them in @secattr. Returns zero on success and negative values on failure. | |
1449 | * | |
1450 | */ | |
8cc44579 PM |
1451 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1452 | u16 family, | |
1453 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1454 | { |
8cc44579 PM |
1455 | struct netlbl_unlhsh_iface *iface; |
1456 | ||
1457 | rcu_read_lock(); | |
b914f3a2 | 1458 | iface = netlbl_unlhsh_search_iface(skb->skb_iif); |
8cc44579 | 1459 | if (iface == NULL) |
b914f3a2 PM |
1460 | iface = rcu_dereference(netlbl_unlhsh_def); |
1461 | if (iface == NULL || !iface->valid) | |
8cc44579 | 1462 | goto unlabel_getattr_nolabel; |
213d7f94 RH |
1463 | |
1464 | #if IS_ENABLED(CONFIG_IPV6) | |
1465 | /* When resolving a fallback label, check the sk_buff version as | |
1466 | * it is possible (e.g. SCTP) to have family = PF_INET6 while | |
1467 | * receiving ip_hdr(skb)->version = 4. | |
1468 | */ | |
1469 | if (family == PF_INET6 && ip_hdr(skb)->version == 4) | |
1470 | family = PF_INET; | |
1471 | #endif /* IPv6 */ | |
1472 | ||
8cc44579 | 1473 | switch (family) { |
56628b1d PE |
1474 | case PF_INET: { |
1475 | struct iphdr *hdr4; | |
61e10682 | 1476 | struct netlbl_af4list *addr4; |
56628b1d | 1477 | |
8cc44579 | 1478 | hdr4 = ip_hdr(skb); |
61e10682 PM |
1479 | addr4 = netlbl_af4list_search(hdr4->saddr, |
1480 | &iface->addr4_list); | |
8cc44579 PM |
1481 | if (addr4 == NULL) |
1482 | goto unlabel_getattr_nolabel; | |
61e10682 | 1483 | secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
8cc44579 | 1484 | break; |
56628b1d | 1485 | } |
dfd56b8b | 1486 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d PE |
1487 | case PF_INET6: { |
1488 | struct ipv6hdr *hdr6; | |
61e10682 | 1489 | struct netlbl_af6list *addr6; |
56628b1d | 1490 | |
8cc44579 | 1491 | hdr6 = ipv6_hdr(skb); |
61e10682 PM |
1492 | addr6 = netlbl_af6list_search(&hdr6->saddr, |
1493 | &iface->addr6_list); | |
8cc44579 PM |
1494 | if (addr6 == NULL) |
1495 | goto unlabel_getattr_nolabel; | |
61e10682 | 1496 | secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; |
8cc44579 | 1497 | break; |
56628b1d | 1498 | } |
8cc44579 PM |
1499 | #endif /* IPv6 */ |
1500 | default: | |
1501 | goto unlabel_getattr_nolabel; | |
1502 | } | |
1503 | rcu_read_unlock(); | |
1504 | ||
1505 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1506 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1507 | return 0; | |
1508 | ||
1509 | unlabel_getattr_nolabel: | |
1510 | rcu_read_unlock(); | |
c783f1ce PM |
1511 | if (netlabel_unlabel_acceptflg == 0) |
1512 | return -ENOMSG; | |
16efd454 | 1513 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1514 | return 0; |
96cb8e33 PM |
1515 | } |
1516 | ||
1517 | /** | |
1518 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1519 | * | |
1520 | * Description: | |
1521 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1522 | * and to send unlabeled network traffic by default. | |
1523 | * | |
1524 | */ | |
05705e4e | 1525 | int __init netlbl_unlabel_defconf(void) |
96cb8e33 PM |
1526 | { |
1527 | int ret_val; | |
1528 | struct netlbl_dom_map *entry; | |
95d4e6be | 1529 | struct netlbl_audit audit_info; |
32f50cde | 1530 | |
95d4e6be PM |
1531 | /* Only the kernel is allowed to call this function and the only time |
1532 | * it is called is at bootup before the audit subsystem is reporting | |
1533 | * messages so don't worry to much about these values. */ | |
1534 | security_task_getsecid(current, &audit_info.secid); | |
e1760bd5 | 1535 | audit_info.loginuid = GLOBAL_ROOT_UID; |
2532386f | 1536 | audit_info.sessionid = 0; |
96cb8e33 PM |
1537 | |
1538 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1539 | if (entry == NULL) | |
1540 | return -ENOMEM; | |
8f18e675 | 1541 | entry->family = AF_UNSPEC; |
6a8b7f0c | 1542 | entry->def.type = NETLBL_NLTYPE_UNLABELED; |
95d4e6be | 1543 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1544 | if (ret_val != 0) |
1545 | return ret_val; | |
1546 | ||
95d4e6be | 1547 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1548 | |
1549 | return 0; | |
1550 | } |