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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]; |
8c70c3d7 MB |
210 | list_for_each_entry_rcu(iter, bkt_list, list, |
211 | lockdep_is_held(&netlbl_unlhsh_lock)) | |
8cc44579 PM |
212 | if (iter->valid && iter->ifindex == ifindex) |
213 | return iter; | |
214 | ||
215 | return NULL; | |
216 | } | |
217 | ||
8cc44579 PM |
218 | /** |
219 | * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table | |
220 | * @iface: the associated interface entry | |
221 | * @addr: IPv4 address in network byte order | |
222 | * @mask: IPv4 address mask in network byte order | |
223 | * @secid: LSM secid value for entry | |
224 | * | |
225 | * Description: | |
226 | * Add a new address entry into the unlabeled connection hash table using the | |
227 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 228 | * a negative value is returned. |
8cc44579 | 229 | * |
32f50cde | 230 | */ |
8cc44579 PM |
231 | static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, |
232 | const struct in_addr *addr, | |
233 | const struct in_addr *mask, | |
234 | u32 secid) | |
235 | { | |
61e10682 | 236 | int ret_val; |
8cc44579 | 237 | struct netlbl_unlhsh_addr4 *entry; |
8cc44579 PM |
238 | |
239 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
240 | if (entry == NULL) | |
241 | return -ENOMEM; | |
242 | ||
61e10682 PM |
243 | entry->list.addr = addr->s_addr & mask->s_addr; |
244 | entry->list.mask = mask->s_addr; | |
245 | entry->list.valid = 1; | |
61e10682 | 246 | entry->secid = secid; |
8cc44579 PM |
247 | |
248 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 249 | ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); |
8cc44579 | 250 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
251 | |
252 | if (ret_val != 0) | |
253 | kfree(entry); | |
254 | return ret_val; | |
8cc44579 PM |
255 | } |
256 | ||
dfd56b8b | 257 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 PM |
258 | /** |
259 | * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table | |
260 | * @iface: the associated interface entry | |
261 | * @addr: IPv6 address in network byte order | |
262 | * @mask: IPv6 address mask in network byte order | |
263 | * @secid: LSM secid value for entry | |
264 | * | |
265 | * Description: | |
266 | * Add a new address entry into the unlabeled connection hash table using the | |
267 | * interface entry specified by @iface. On success zero is returned, otherwise | |
b914f3a2 | 268 | * a negative value is returned. |
8cc44579 PM |
269 | * |
270 | */ | |
271 | static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, | |
272 | const struct in6_addr *addr, | |
273 | const struct in6_addr *mask, | |
274 | u32 secid) | |
275 | { | |
61e10682 | 276 | int ret_val; |
8cc44579 | 277 | struct netlbl_unlhsh_addr6 *entry; |
8cc44579 PM |
278 | |
279 | entry = kzalloc(sizeof(*entry), GFP_ATOMIC); | |
280 | if (entry == NULL) | |
281 | return -ENOMEM; | |
282 | ||
4e3fd7a0 | 283 | entry->list.addr = *addr; |
61e10682 PM |
284 | entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; |
285 | entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; | |
286 | entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; | |
287 | entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; | |
4e3fd7a0 | 288 | entry->list.mask = *mask; |
61e10682 | 289 | entry->list.valid = 1; |
61e10682 | 290 | entry->secid = secid; |
8cc44579 PM |
291 | |
292 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 293 | ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); |
8cc44579 | 294 | spin_unlock(&netlbl_unlhsh_lock); |
61e10682 PM |
295 | |
296 | if (ret_val != 0) | |
297 | kfree(entry); | |
8cc44579 PM |
298 | return 0; |
299 | } | |
300 | #endif /* IPv6 */ | |
301 | ||
302 | /** | |
303 | * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table | |
304 | * @ifindex: network interface | |
305 | * | |
306 | * Description: | |
307 | * Add a new, empty, interface entry into the unlabeled connection hash table. | |
308 | * On success a pointer to the new interface entry is returned, on failure NULL | |
b914f3a2 | 309 | * is returned. |
8cc44579 PM |
310 | * |
311 | */ | |
312 | static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) | |
313 | { | |
314 | u32 bkt; | |
315 | struct netlbl_unlhsh_iface *iface; | |
316 | ||
317 | iface = kzalloc(sizeof(*iface), GFP_ATOMIC); | |
318 | if (iface == NULL) | |
319 | return NULL; | |
320 | ||
321 | iface->ifindex = ifindex; | |
322 | INIT_LIST_HEAD(&iface->addr4_list); | |
323 | INIT_LIST_HEAD(&iface->addr6_list); | |
324 | iface->valid = 1; | |
8cc44579 PM |
325 | |
326 | spin_lock(&netlbl_unlhsh_lock); | |
327 | if (ifindex > 0) { | |
328 | bkt = netlbl_unlhsh_hash(ifindex); | |
329 | if (netlbl_unlhsh_search_iface(ifindex) != NULL) | |
330 | goto add_iface_failure; | |
331 | list_add_tail_rcu(&iface->list, | |
b914f3a2 | 332 | &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]); |
8cc44579 PM |
333 | } else { |
334 | INIT_LIST_HEAD(&iface->list); | |
b914f3a2 | 335 | if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL) |
8cc44579 | 336 | goto add_iface_failure; |
cf778b00 | 337 | rcu_assign_pointer(netlbl_unlhsh_def, iface); |
8cc44579 PM |
338 | } |
339 | spin_unlock(&netlbl_unlhsh_lock); | |
340 | ||
341 | return iface; | |
342 | ||
343 | add_iface_failure: | |
344 | spin_unlock(&netlbl_unlhsh_lock); | |
345 | kfree(iface); | |
346 | return NULL; | |
347 | } | |
348 | ||
349 | /** | |
350 | * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table | |
351 | * @net: network namespace | |
352 | * @dev_name: interface name | |
353 | * @addr: IP address in network byte order | |
354 | * @mask: address mask in network byte order | |
355 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
356 | * @secid: LSM secid value for the entry | |
13541b3a | 357 | * @audit_info: NetLabel audit information |
8cc44579 PM |
358 | * |
359 | * Description: | |
360 | * Adds a new entry to the unlabeled connection hash table. Returns zero on | |
361 | * success, negative values on failure. | |
362 | * | |
363 | */ | |
6c2e8ac0 PM |
364 | int netlbl_unlhsh_add(struct net *net, |
365 | const char *dev_name, | |
366 | const void *addr, | |
367 | const void *mask, | |
368 | u32 addr_len, | |
369 | u32 secid, | |
370 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
371 | { |
372 | int ret_val; | |
373 | int ifindex; | |
374 | struct net_device *dev; | |
375 | struct netlbl_unlhsh_iface *iface; | |
13541b3a PM |
376 | struct audit_buffer *audit_buf = NULL; |
377 | char *secctx = NULL; | |
378 | u32 secctx_len; | |
8cc44579 PM |
379 | |
380 | if (addr_len != sizeof(struct in_addr) && | |
381 | addr_len != sizeof(struct in6_addr)) | |
382 | return -EINVAL; | |
383 | ||
384 | rcu_read_lock(); | |
385 | if (dev_name != NULL) { | |
122ec6ff | 386 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
387 | if (dev == NULL) { |
388 | ret_val = -ENODEV; | |
389 | goto unlhsh_add_return; | |
390 | } | |
391 | ifindex = dev->ifindex; | |
8cc44579 PM |
392 | iface = netlbl_unlhsh_search_iface(ifindex); |
393 | } else { | |
394 | ifindex = 0; | |
395 | iface = rcu_dereference(netlbl_unlhsh_def); | |
396 | } | |
397 | if (iface == NULL) { | |
398 | iface = netlbl_unlhsh_add_iface(ifindex); | |
399 | if (iface == NULL) { | |
400 | ret_val = -ENOMEM; | |
401 | goto unlhsh_add_return; | |
402 | } | |
403 | } | |
13541b3a PM |
404 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD, |
405 | audit_info); | |
8cc44579 | 406 | switch (addr_len) { |
56628b1d | 407 | case sizeof(struct in_addr): { |
ea110733 JP |
408 | const struct in_addr *addr4 = addr; |
409 | const struct in_addr *mask4 = mask; | |
56628b1d | 410 | |
13541b3a PM |
411 | ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); |
412 | if (audit_buf != NULL) | |
63c41688 PM |
413 | netlbl_af4list_audit_addr(audit_buf, 1, |
414 | dev_name, | |
415 | addr4->s_addr, | |
416 | mask4->s_addr); | |
8cc44579 | 417 | break; |
56628b1d | 418 | } |
dfd56b8b | 419 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d | 420 | case sizeof(struct in6_addr): { |
ea110733 JP |
421 | const struct in6_addr *addr6 = addr; |
422 | const struct in6_addr *mask6 = mask; | |
56628b1d | 423 | |
13541b3a PM |
424 | ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid); |
425 | if (audit_buf != NULL) | |
63c41688 PM |
426 | netlbl_af6list_audit_addr(audit_buf, 1, |
427 | dev_name, | |
428 | addr6, mask6); | |
8cc44579 | 429 | break; |
56628b1d | 430 | } |
8cc44579 PM |
431 | #endif /* IPv6 */ |
432 | default: | |
433 | ret_val = -EINVAL; | |
434 | } | |
435 | if (ret_val == 0) | |
436 | atomic_inc(&netlabel_mgmt_protocount); | |
437 | ||
438 | unlhsh_add_return: | |
439 | rcu_read_unlock(); | |
13541b3a PM |
440 | if (audit_buf != NULL) { |
441 | if (security_secid_to_secctx(secid, | |
442 | &secctx, | |
443 | &secctx_len) == 0) { | |
444 | audit_log_format(audit_buf, " sec_obj=%s", secctx); | |
445 | security_release_secctx(secctx, secctx_len); | |
446 | } | |
447 | audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0); | |
448 | audit_log_end(audit_buf); | |
449 | } | |
8cc44579 PM |
450 | return ret_val; |
451 | } | |
452 | ||
453 | /** | |
454 | * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry | |
13541b3a | 455 | * @net: network namespace |
8cc44579 PM |
456 | * @iface: interface entry |
457 | * @addr: IP address | |
458 | * @mask: IP address mask | |
13541b3a | 459 | * @audit_info: NetLabel audit information |
8cc44579 PM |
460 | * |
461 | * Description: | |
462 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 463 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
464 | * |
465 | */ | |
13541b3a PM |
466 | static int netlbl_unlhsh_remove_addr4(struct net *net, |
467 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 468 | const struct in_addr *addr, |
13541b3a PM |
469 | const struct in_addr *mask, |
470 | struct netlbl_audit *audit_info) | |
8cc44579 | 471 | { |
61e10682 | 472 | struct netlbl_af4list *list_entry; |
8cc44579 | 473 | struct netlbl_unlhsh_addr4 *entry; |
61e10682 | 474 | struct audit_buffer *audit_buf; |
13541b3a | 475 | struct net_device *dev; |
61e10682 | 476 | char *secctx; |
13541b3a | 477 | u32 secctx_len; |
8cc44579 PM |
478 | |
479 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
480 | list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr, |
481 | &iface->addr4_list); | |
8cc44579 | 482 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
483 | if (list_entry != NULL) |
484 | entry = netlbl_unlhsh_addr4_entry(list_entry); | |
485 | else | |
ec8f2375 | 486 | entry = NULL; |
8cc44579 | 487 | |
13541b3a PM |
488 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL, |
489 | audit_info); | |
490 | if (audit_buf != NULL) { | |
491 | dev = dev_get_by_index(net, iface->ifindex); | |
63c41688 PM |
492 | netlbl_af4list_audit_addr(audit_buf, 1, |
493 | (dev != NULL ? dev->name : NULL), | |
494 | addr->s_addr, mask->s_addr); | |
13541b3a PM |
495 | if (dev != NULL) |
496 | dev_put(dev); | |
ec8f2375 PM |
497 | if (entry != NULL && |
498 | security_secid_to_secctx(entry->secid, | |
499 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
500 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
501 | security_release_secctx(secctx, secctx_len); | |
502 | } | |
ec8f2375 | 503 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
504 | audit_log_end(audit_buf); |
505 | } | |
506 | ||
ec8f2375 PM |
507 | if (entry == NULL) |
508 | return -ENOENT; | |
509 | ||
c3b49420 | 510 | kfree_rcu(entry, rcu); |
ec8f2375 | 511 | return 0; |
8cc44579 PM |
512 | } |
513 | ||
dfd56b8b | 514 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 PM |
515 | /** |
516 | * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry | |
13541b3a | 517 | * @net: network namespace |
8cc44579 PM |
518 | * @iface: interface entry |
519 | * @addr: IP address | |
520 | * @mask: IP address mask | |
13541b3a | 521 | * @audit_info: NetLabel audit information |
8cc44579 PM |
522 | * |
523 | * Description: | |
524 | * Remove an IP address entry from the unlabeled connection hash table. | |
b914f3a2 | 525 | * Returns zero on success, negative values on failure. |
8cc44579 PM |
526 | * |
527 | */ | |
13541b3a PM |
528 | static int netlbl_unlhsh_remove_addr6(struct net *net, |
529 | struct netlbl_unlhsh_iface *iface, | |
8cc44579 | 530 | const struct in6_addr *addr, |
13541b3a PM |
531 | const struct in6_addr *mask, |
532 | struct netlbl_audit *audit_info) | |
8cc44579 | 533 | { |
61e10682 | 534 | struct netlbl_af6list *list_entry; |
8cc44579 | 535 | struct netlbl_unlhsh_addr6 *entry; |
61e10682 | 536 | struct audit_buffer *audit_buf; |
13541b3a | 537 | struct net_device *dev; |
61e10682 | 538 | char *secctx; |
13541b3a | 539 | u32 secctx_len; |
8cc44579 PM |
540 | |
541 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 | 542 | list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list); |
8cc44579 | 543 | spin_unlock(&netlbl_unlhsh_lock); |
d25830e5 PM |
544 | if (list_entry != NULL) |
545 | entry = netlbl_unlhsh_addr6_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_af6list_audit_addr(audit_buf, 1, |
554 | (dev != NULL ? dev->name : NULL), | |
555 | addr, mask); | |
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 | ||
6b262232 | 571 | kfree_rcu(entry, rcu); |
ec8f2375 | 572 | return 0; |
8cc44579 PM |
573 | } |
574 | #endif /* IPv6 */ | |
575 | ||
576 | /** | |
577 | * netlbl_unlhsh_condremove_iface - Remove an interface entry | |
578 | * @iface: the interface entry | |
579 | * | |
580 | * Description: | |
581 | * Remove an interface entry from the unlabeled connection hash table if it is | |
582 | * empty. An interface entry is considered to be empty if there are no | |
583 | * address entries assigned to it. | |
584 | * | |
585 | */ | |
586 | static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) | |
587 | { | |
61e10682 | 588 | struct netlbl_af4list *iter4; |
dfd56b8b | 589 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
590 | struct netlbl_af6list *iter6; |
591 | #endif /* IPv6 */ | |
8cc44579 PM |
592 | |
593 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
594 | netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list) |
595 | goto unlhsh_condremove_failure; | |
dfd56b8b | 596 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
597 | netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list) |
598 | goto unlhsh_condremove_failure; | |
599 | #endif /* IPv6 */ | |
8cc44579 PM |
600 | iface->valid = 0; |
601 | if (iface->ifindex > 0) | |
602 | list_del_rcu(&iface->list); | |
603 | else | |
a9b3cd7f | 604 | RCU_INIT_POINTER(netlbl_unlhsh_def, NULL); |
8cc44579 PM |
605 | spin_unlock(&netlbl_unlhsh_lock); |
606 | ||
607 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
608 | return; | |
609 | ||
610 | unlhsh_condremove_failure: | |
611 | spin_unlock(&netlbl_unlhsh_lock); | |
8cc44579 PM |
612 | } |
613 | ||
614 | /** | |
615 | * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table | |
616 | * @net: network namespace | |
617 | * @dev_name: interface name | |
618 | * @addr: IP address in network byte order | |
619 | * @mask: address mask in network byte order | |
620 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
13541b3a | 621 | * @audit_info: NetLabel audit information |
8cc44579 PM |
622 | * |
623 | * Description: | |
624 | * Removes and existing entry from the unlabeled connection hash table. | |
625 | * Returns zero on success, negative values on failure. | |
626 | * | |
627 | */ | |
6c2e8ac0 PM |
628 | int netlbl_unlhsh_remove(struct net *net, |
629 | const char *dev_name, | |
630 | const void *addr, | |
631 | const void *mask, | |
632 | u32 addr_len, | |
633 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
634 | { |
635 | int ret_val; | |
636 | struct net_device *dev; | |
637 | struct netlbl_unlhsh_iface *iface; | |
638 | ||
639 | if (addr_len != sizeof(struct in_addr) && | |
640 | addr_len != sizeof(struct in6_addr)) | |
641 | return -EINVAL; | |
642 | ||
643 | rcu_read_lock(); | |
644 | if (dev_name != NULL) { | |
122ec6ff | 645 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
646 | if (dev == NULL) { |
647 | ret_val = -ENODEV; | |
648 | goto unlhsh_remove_return; | |
649 | } | |
650 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
8cc44579 PM |
651 | } else |
652 | iface = rcu_dereference(netlbl_unlhsh_def); | |
653 | if (iface == NULL) { | |
654 | ret_val = -ENOENT; | |
655 | goto unlhsh_remove_return; | |
656 | } | |
657 | switch (addr_len) { | |
658 | case sizeof(struct in_addr): | |
13541b3a PM |
659 | ret_val = netlbl_unlhsh_remove_addr4(net, |
660 | iface, addr, mask, | |
661 | audit_info); | |
8cc44579 | 662 | break; |
dfd56b8b | 663 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 | 664 | case sizeof(struct in6_addr): |
13541b3a PM |
665 | ret_val = netlbl_unlhsh_remove_addr6(net, |
666 | iface, addr, mask, | |
667 | audit_info); | |
8cc44579 PM |
668 | break; |
669 | #endif /* IPv6 */ | |
670 | default: | |
671 | ret_val = -EINVAL; | |
672 | } | |
673 | if (ret_val == 0) { | |
674 | netlbl_unlhsh_condremove_iface(iface); | |
675 | atomic_dec(&netlabel_mgmt_protocount); | |
676 | } | |
677 | ||
678 | unlhsh_remove_return: | |
679 | rcu_read_unlock(); | |
680 | return ret_val; | |
681 | } | |
682 | ||
683 | /* | |
684 | * General Helper Functions | |
685 | */ | |
686 | ||
687 | /** | |
688 | * netlbl_unlhsh_netdev_handler - Network device notification handler | |
689 | * @this: notifier block | |
690 | * @event: the event | |
351638e7 | 691 | * @ptr: the netdevice notifier info (cast to void) |
8cc44579 PM |
692 | * |
693 | * Description: | |
694 | * Handle network device events, although at present all we care about is a | |
695 | * network device going away. In the case of a device going away we clear any | |
696 | * related entries from the unlabeled connection hash table. | |
697 | * | |
698 | */ | |
699 | static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, | |
351638e7 | 700 | unsigned long event, void *ptr) |
8cc44579 | 701 | { |
351638e7 | 702 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
8cc44579 PM |
703 | struct netlbl_unlhsh_iface *iface = NULL; |
704 | ||
721499e8 | 705 | if (!net_eq(dev_net(dev), &init_net)) |
8cc44579 PM |
706 | return NOTIFY_DONE; |
707 | ||
708 | /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ | |
709 | if (event == NETDEV_DOWN) { | |
710 | spin_lock(&netlbl_unlhsh_lock); | |
711 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
712 | if (iface != NULL && iface->valid) { | |
713 | iface->valid = 0; | |
714 | list_del_rcu(&iface->list); | |
715 | } else | |
716 | iface = NULL; | |
717 | spin_unlock(&netlbl_unlhsh_lock); | |
718 | } | |
719 | ||
720 | if (iface != NULL) | |
721 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
722 | ||
723 | return NOTIFY_DONE; | |
724 | } | |
32f50cde PM |
725 | |
726 | /** | |
727 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
728 | * @value: desired value | |
95d4e6be | 729 | * @audit_info: NetLabel audit information |
32f50cde PM |
730 | * |
731 | * Description: | |
732 | * Set the value of the unlabeled accept flag to @value. | |
733 | * | |
734 | */ | |
95d4e6be PM |
735 | static void netlbl_unlabel_acceptflg_set(u8 value, |
736 | struct netlbl_audit *audit_info) | |
32f50cde | 737 | { |
95d4e6be PM |
738 | struct audit_buffer *audit_buf; |
739 | u8 old_val; | |
740 | ||
4be2700f | 741 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 742 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
743 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
744 | audit_info); | |
de64688f PM |
745 | if (audit_buf != NULL) { |
746 | audit_log_format(audit_buf, | |
747 | " unlbl_accept=%u old=%u", value, old_val); | |
748 | audit_log_end(audit_buf); | |
749 | } | |
32f50cde PM |
750 | } |
751 | ||
8cc44579 PM |
752 | /** |
753 | * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information | |
754 | * @info: the Generic NETLINK info block | |
755 | * @addr: the IP address | |
756 | * @mask: the IP address mask | |
757 | * @len: the address length | |
758 | * | |
759 | * Description: | |
760 | * Examine the Generic NETLINK message and extract the IP address information. | |
761 | * Returns zero on success, negative values on failure. | |
762 | * | |
763 | */ | |
764 | static int netlbl_unlabel_addrinfo_get(struct genl_info *info, | |
765 | void **addr, | |
766 | void **mask, | |
767 | u32 *len) | |
768 | { | |
769 | u32 addr_len; | |
770 | ||
f88b4c01 ST |
771 | if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR] && |
772 | info->attrs[NLBL_UNLABEL_A_IPV4MASK]) { | |
8cc44579 PM |
773 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); |
774 | if (addr_len != sizeof(struct in_addr) && | |
775 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) | |
776 | return -EINVAL; | |
777 | *len = addr_len; | |
778 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
779 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); | |
780 | return 0; | |
781 | } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { | |
782 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
783 | if (addr_len != sizeof(struct in6_addr) && | |
784 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) | |
785 | return -EINVAL; | |
786 | *len = addr_len; | |
787 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
788 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); | |
789 | return 0; | |
790 | } | |
791 | ||
792 | return -EINVAL; | |
793 | } | |
794 | ||
96cb8e33 PM |
795 | /* |
796 | * NetLabel Command Handlers | |
797 | */ | |
798 | ||
799 | /** | |
800 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
801 | * @skb: the NETLINK buffer | |
802 | * @info: the Generic NETLINK info block | |
803 | * | |
804 | * Description: | |
805 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
806 | * Returns zero on success, negative values on failure. | |
807 | * | |
808 | */ | |
809 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
810 | { | |
fd385855 | 811 | u8 value; |
95d4e6be | 812 | struct netlbl_audit audit_info; |
96cb8e33 | 813 | |
fd385855 PM |
814 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
815 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 816 | if (value == 1 || value == 0) { |
95d4e6be PM |
817 | netlbl_netlink_auditinfo(skb, &audit_info); |
818 | netlbl_unlabel_acceptflg_set(value, &audit_info); | |
32f50cde | 819 | return 0; |
96cb8e33 PM |
820 | } |
821 | } | |
822 | ||
32f50cde | 823 | return -EINVAL; |
96cb8e33 PM |
824 | } |
825 | ||
826 | /** | |
827 | * netlbl_unlabel_list - Handle a LIST message | |
828 | * @skb: the NETLINK buffer | |
829 | * @info: the Generic NETLINK info block | |
830 | * | |
831 | * Description: | |
832 | * Process a user generated LIST message and respond with the current status. | |
833 | * Returns zero on success, negative values on failure. | |
834 | * | |
835 | */ | |
836 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
837 | { | |
fd385855 | 838 | int ret_val = -EINVAL; |
96cb8e33 | 839 | struct sk_buff *ans_skb; |
fd385855 | 840 | void *data; |
96cb8e33 | 841 | |
339bf98f | 842 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
843 | if (ans_skb == NULL) |
844 | goto list_failure; | |
17c157c8 TG |
845 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
846 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
847 | if (data == NULL) { |
848 | ret_val = -ENOMEM; | |
96cb8e33 | 849 | goto list_failure; |
fd385855 | 850 | } |
96cb8e33 | 851 | |
fd385855 PM |
852 | ret_val = nla_put_u8(ans_skb, |
853 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 854 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
855 | if (ret_val != 0) |
856 | goto list_failure; | |
857 | ||
fd385855 | 858 | genlmsg_end(ans_skb, data); |
fe785bee | 859 | return genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
860 | |
861 | list_failure: | |
b08d5840 | 862 | kfree_skb(ans_skb); |
96cb8e33 PM |
863 | return ret_val; |
864 | } | |
865 | ||
8cc44579 PM |
866 | /** |
867 | * netlbl_unlabel_staticadd - Handle a STATICADD message | |
868 | * @skb: the NETLINK buffer | |
869 | * @info: the Generic NETLINK info block | |
870 | * | |
871 | * Description: | |
872 | * Process a user generated STATICADD message and add a new unlabeled | |
873 | * connection entry to the hash table. Returns zero on success, negative | |
874 | * values on failure. | |
875 | * | |
876 | */ | |
877 | static int netlbl_unlabel_staticadd(struct sk_buff *skb, | |
878 | struct genl_info *info) | |
879 | { | |
880 | int ret_val; | |
881 | char *dev_name; | |
882 | void *addr; | |
883 | void *mask; | |
884 | u32 addr_len; | |
885 | u32 secid; | |
13541b3a | 886 | struct netlbl_audit audit_info; |
8cc44579 PM |
887 | |
888 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
889 | * single entry. However, allow users to create two entries, one each | |
890 | * for IPv4 and IPv4, with the same LSM security context which should | |
891 | * achieve the same result. */ | |
892 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
893 | !info->attrs[NLBL_UNLABEL_A_IFACE] || | |
894 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
895 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
896 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
897 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
898 | return -EINVAL; | |
899 | ||
13541b3a PM |
900 | netlbl_netlink_auditinfo(skb, &audit_info); |
901 | ||
8cc44579 PM |
902 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
903 | if (ret_val != 0) | |
904 | return ret_val; | |
905 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
906 | ret_val = security_secctx_to_secid( | |
907 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
908 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
909 | &secid); | |
910 | if (ret_val != 0) | |
911 | return ret_val; | |
912 | ||
913 | return netlbl_unlhsh_add(&init_net, | |
13541b3a PM |
914 | dev_name, addr, mask, addr_len, secid, |
915 | &audit_info); | |
8cc44579 PM |
916 | } |
917 | ||
918 | /** | |
919 | * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message | |
920 | * @skb: the NETLINK buffer | |
921 | * @info: the Generic NETLINK info block | |
922 | * | |
923 | * Description: | |
924 | * Process a user generated STATICADDDEF message and add a new default | |
925 | * unlabeled connection entry. Returns zero on success, negative values on | |
926 | * failure. | |
927 | * | |
928 | */ | |
929 | static int netlbl_unlabel_staticadddef(struct sk_buff *skb, | |
930 | struct genl_info *info) | |
931 | { | |
932 | int ret_val; | |
933 | void *addr; | |
934 | void *mask; | |
935 | u32 addr_len; | |
936 | u32 secid; | |
13541b3a | 937 | struct netlbl_audit audit_info; |
8cc44579 PM |
938 | |
939 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
940 | * single entry. However, allow users to create two entries, one each | |
941 | * for IPv4 and IPv6, with the same LSM security context which should | |
942 | * achieve the same result. */ | |
943 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
944 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
945 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
946 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
947 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
948 | return -EINVAL; | |
949 | ||
13541b3a PM |
950 | netlbl_netlink_auditinfo(skb, &audit_info); |
951 | ||
8cc44579 PM |
952 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
953 | if (ret_val != 0) | |
954 | return ret_val; | |
955 | ret_val = security_secctx_to_secid( | |
956 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
957 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
958 | &secid); | |
959 | if (ret_val != 0) | |
960 | return ret_val; | |
961 | ||
13541b3a PM |
962 | return netlbl_unlhsh_add(&init_net, |
963 | NULL, addr, mask, addr_len, secid, | |
964 | &audit_info); | |
8cc44579 PM |
965 | } |
966 | ||
967 | /** | |
968 | * netlbl_unlabel_staticremove - Handle a STATICREMOVE message | |
969 | * @skb: the NETLINK buffer | |
970 | * @info: the Generic NETLINK info block | |
971 | * | |
972 | * Description: | |
973 | * Process a user generated STATICREMOVE message and remove the specified | |
974 | * unlabeled connection entry. Returns zero on success, negative values on | |
975 | * failure. | |
976 | * | |
977 | */ | |
978 | static int netlbl_unlabel_staticremove(struct sk_buff *skb, | |
979 | struct genl_info *info) | |
980 | { | |
981 | int ret_val; | |
982 | char *dev_name; | |
983 | void *addr; | |
984 | void *mask; | |
985 | u32 addr_len; | |
13541b3a | 986 | struct netlbl_audit audit_info; |
8cc44579 PM |
987 | |
988 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
989 | * IPv4 and IPv6 in the same entry. */ | |
990 | if (!info->attrs[NLBL_UNLABEL_A_IFACE] || | |
991 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
992 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
993 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
994 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
995 | return -EINVAL; | |
996 | ||
13541b3a PM |
997 | netlbl_netlink_auditinfo(skb, &audit_info); |
998 | ||
8cc44579 PM |
999 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1000 | if (ret_val != 0) | |
1001 | return ret_val; | |
1002 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1003 | ||
13541b3a PM |
1004 | return netlbl_unlhsh_remove(&init_net, |
1005 | dev_name, addr, mask, addr_len, | |
1006 | &audit_info); | |
8cc44579 PM |
1007 | } |
1008 | ||
1009 | /** | |
1010 | * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message | |
1011 | * @skb: the NETLINK buffer | |
1012 | * @info: the Generic NETLINK info block | |
1013 | * | |
1014 | * Description: | |
1015 | * Process a user generated STATICREMOVEDEF message and remove the default | |
1016 | * unlabeled connection entry. Returns zero on success, negative values on | |
1017 | * failure. | |
1018 | * | |
1019 | */ | |
1020 | static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, | |
1021 | struct genl_info *info) | |
1022 | { | |
1023 | int ret_val; | |
1024 | void *addr; | |
1025 | void *mask; | |
1026 | u32 addr_len; | |
13541b3a | 1027 | struct netlbl_audit audit_info; |
8cc44579 PM |
1028 | |
1029 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1030 | * IPv4 and IPv6 in the same entry. */ | |
1031 | if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1032 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1033 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1034 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1035 | return -EINVAL; | |
1036 | ||
13541b3a PM |
1037 | netlbl_netlink_auditinfo(skb, &audit_info); |
1038 | ||
8cc44579 PM |
1039 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1040 | if (ret_val != 0) | |
1041 | return ret_val; | |
1042 | ||
13541b3a PM |
1043 | return netlbl_unlhsh_remove(&init_net, |
1044 | NULL, addr, mask, addr_len, | |
1045 | &audit_info); | |
8cc44579 PM |
1046 | } |
1047 | ||
1048 | ||
1049 | /** | |
1050 | * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] | |
1051 | * @cmd: command/message | |
1052 | * @iface: the interface entry | |
1053 | * @addr4: the IPv4 address entry | |
1054 | * @addr6: the IPv6 address entry | |
1055 | * @arg: the netlbl_unlhsh_walk_arg structure | |
1056 | * | |
1057 | * Description: | |
1058 | * This function is designed to be used to generate a response for a | |
1059 | * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 | |
1060 | * can be specified, not both, the other unspecified entry should be set to | |
1061 | * NULL by the caller. Returns the size of the message on success, negative | |
1062 | * values on failure. | |
1063 | * | |
1064 | */ | |
1065 | static int netlbl_unlabel_staticlist_gen(u32 cmd, | |
1066 | const struct netlbl_unlhsh_iface *iface, | |
1067 | const struct netlbl_unlhsh_addr4 *addr4, | |
1068 | const struct netlbl_unlhsh_addr6 *addr6, | |
1069 | void *arg) | |
1070 | { | |
1071 | int ret_val = -ENOMEM; | |
1072 | struct netlbl_unlhsh_walk_arg *cb_arg = arg; | |
1073 | struct net_device *dev; | |
1074 | void *data; | |
1075 | u32 secid; | |
1076 | char *secctx; | |
1077 | u32 secctx_len; | |
1078 | ||
15e47304 | 1079 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, |
8cc44579 PM |
1080 | cb_arg->seq, &netlbl_unlabel_gnl_family, |
1081 | NLM_F_MULTI, cmd); | |
1082 | if (data == NULL) | |
1083 | goto list_cb_failure; | |
1084 | ||
1085 | if (iface->ifindex > 0) { | |
1086 | dev = dev_get_by_index(&init_net, iface->ifindex); | |
794eb6bf JJ |
1087 | if (!dev) { |
1088 | ret_val = -ENODEV; | |
1089 | goto list_cb_failure; | |
1090 | } | |
8cc44579 PM |
1091 | ret_val = nla_put_string(cb_arg->skb, |
1092 | NLBL_UNLABEL_A_IFACE, dev->name); | |
1093 | dev_put(dev); | |
1094 | if (ret_val != 0) | |
1095 | goto list_cb_failure; | |
1096 | } | |
1097 | ||
1098 | if (addr4) { | |
1099 | struct in_addr addr_struct; | |
1100 | ||
61e10682 | 1101 | addr_struct.s_addr = addr4->list.addr; |
930345ea JB |
1102 | ret_val = nla_put_in_addr(cb_arg->skb, |
1103 | NLBL_UNLABEL_A_IPV4ADDR, | |
1104 | addr_struct.s_addr); | |
8cc44579 PM |
1105 | if (ret_val != 0) |
1106 | goto list_cb_failure; | |
1107 | ||
61e10682 | 1108 | addr_struct.s_addr = addr4->list.mask; |
930345ea JB |
1109 | ret_val = nla_put_in_addr(cb_arg->skb, |
1110 | NLBL_UNLABEL_A_IPV4MASK, | |
1111 | addr_struct.s_addr); | |
8cc44579 PM |
1112 | if (ret_val != 0) |
1113 | goto list_cb_failure; | |
1114 | ||
1115 | secid = addr4->secid; | |
1116 | } else { | |
930345ea JB |
1117 | ret_val = nla_put_in6_addr(cb_arg->skb, |
1118 | NLBL_UNLABEL_A_IPV6ADDR, | |
1119 | &addr6->list.addr); | |
8cc44579 PM |
1120 | if (ret_val != 0) |
1121 | goto list_cb_failure; | |
1122 | ||
930345ea JB |
1123 | ret_val = nla_put_in6_addr(cb_arg->skb, |
1124 | NLBL_UNLABEL_A_IPV6MASK, | |
1125 | &addr6->list.mask); | |
8cc44579 PM |
1126 | if (ret_val != 0) |
1127 | goto list_cb_failure; | |
1128 | ||
1129 | secid = addr6->secid; | |
1130 | } | |
1131 | ||
1132 | ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); | |
1133 | if (ret_val != 0) | |
1134 | goto list_cb_failure; | |
1135 | ret_val = nla_put(cb_arg->skb, | |
1136 | NLBL_UNLABEL_A_SECCTX, | |
1137 | secctx_len, | |
1138 | secctx); | |
1139 | security_release_secctx(secctx, secctx_len); | |
1140 | if (ret_val != 0) | |
1141 | goto list_cb_failure; | |
1142 | ||
1143 | cb_arg->seq++; | |
053c095a JB |
1144 | genlmsg_end(cb_arg->skb, data); |
1145 | return 0; | |
8cc44579 PM |
1146 | |
1147 | list_cb_failure: | |
1148 | genlmsg_cancel(cb_arg->skb, data); | |
1149 | return ret_val; | |
1150 | } | |
1151 | ||
1152 | /** | |
1153 | * netlbl_unlabel_staticlist - Handle a STATICLIST message | |
1154 | * @skb: the NETLINK buffer | |
1155 | * @cb: the NETLINK callback | |
1156 | * | |
1157 | * Description: | |
1158 | * Process a user generated STATICLIST message and dump the unlabeled | |
1159 | * connection hash table in a form suitable for use in a kernel generated | |
1160 | * STATICLIST message. Returns the length of @skb. | |
1161 | * | |
1162 | */ | |
1163 | static int netlbl_unlabel_staticlist(struct sk_buff *skb, | |
1164 | struct netlink_callback *cb) | |
1165 | { | |
1166 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1167 | u32 skip_bkt = cb->args[0]; | |
1168 | u32 skip_chain = cb->args[1]; | |
8cc44579 PM |
1169 | u32 iter_bkt; |
1170 | u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; | |
1171 | struct netlbl_unlhsh_iface *iface; | |
56196701 | 1172 | struct list_head *iter_list; |
61e10682 | 1173 | struct netlbl_af4list *addr4; |
dfd56b8b | 1174 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1175 | struct netlbl_af6list *addr6; |
1176 | #endif | |
8cc44579 PM |
1177 | |
1178 | cb_arg.nl_cb = cb; | |
1179 | cb_arg.skb = skb; | |
1180 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1181 | ||
1182 | rcu_read_lock(); | |
1183 | for (iter_bkt = skip_bkt; | |
1184 | iter_bkt < rcu_dereference(netlbl_unlhsh)->size; | |
1185 | iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) { | |
56196701 PM |
1186 | iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; |
1187 | list_for_each_entry_rcu(iface, iter_list, list) { | |
8cc44579 PM |
1188 | if (!iface->valid || |
1189 | iter_chain++ < skip_chain) | |
1190 | continue; | |
61e10682 PM |
1191 | netlbl_af4list_foreach_rcu(addr4, |
1192 | &iface->addr4_list) { | |
a6a8fe95 | 1193 | if (iter_addr4++ < cb->args[2]) |
8cc44579 PM |
1194 | continue; |
1195 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1196 | NLBL_UNLABEL_C_STATICLIST, |
1197 | iface, | |
1198 | netlbl_unlhsh_addr4_entry(addr4), | |
1199 | NULL, | |
1200 | &cb_arg) < 0) { | |
8cc44579 PM |
1201 | iter_addr4--; |
1202 | iter_chain--; | |
1203 | goto unlabel_staticlist_return; | |
1204 | } | |
1205 | } | |
dfd56b8b | 1206 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1207 | netlbl_af6list_foreach_rcu(addr6, |
1208 | &iface->addr6_list) { | |
a6a8fe95 | 1209 | if (iter_addr6++ < cb->args[3]) |
8cc44579 PM |
1210 | continue; |
1211 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1212 | NLBL_UNLABEL_C_STATICLIST, |
1213 | iface, | |
1214 | NULL, | |
1215 | netlbl_unlhsh_addr6_entry(addr6), | |
1216 | &cb_arg) < 0) { | |
8cc44579 PM |
1217 | iter_addr6--; |
1218 | iter_chain--; | |
1219 | goto unlabel_staticlist_return; | |
1220 | } | |
1221 | } | |
61e10682 | 1222 | #endif /* IPv6 */ |
8cc44579 PM |
1223 | } |
1224 | } | |
1225 | ||
1226 | unlabel_staticlist_return: | |
1227 | rcu_read_unlock(); | |
0c1233ab PM |
1228 | cb->args[0] = iter_bkt; |
1229 | cb->args[1] = iter_chain; | |
1230 | cb->args[2] = iter_addr4; | |
1231 | cb->args[3] = iter_addr6; | |
8cc44579 PM |
1232 | return skb->len; |
1233 | } | |
1234 | ||
1235 | /** | |
1236 | * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message | |
1237 | * @skb: the NETLINK buffer | |
1238 | * @cb: the NETLINK callback | |
1239 | * | |
1240 | * Description: | |
1241 | * Process a user generated STATICLISTDEF message and dump the default | |
1242 | * unlabeled connection entry in a form suitable for use in a kernel generated | |
1243 | * STATICLISTDEF message. Returns the length of @skb. | |
1244 | * | |
1245 | */ | |
1246 | static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, | |
1247 | struct netlink_callback *cb) | |
1248 | { | |
1249 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1250 | struct netlbl_unlhsh_iface *iface; | |
a6a8fe95 | 1251 | u32 iter_addr4 = 0, iter_addr6 = 0; |
61e10682 | 1252 | struct netlbl_af4list *addr4; |
dfd56b8b | 1253 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1254 | struct netlbl_af6list *addr6; |
1255 | #endif | |
8cc44579 PM |
1256 | |
1257 | cb_arg.nl_cb = cb; | |
1258 | cb_arg.skb = skb; | |
1259 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1260 | ||
1261 | rcu_read_lock(); | |
1262 | iface = rcu_dereference(netlbl_unlhsh_def); | |
1263 | if (iface == NULL || !iface->valid) | |
1264 | goto unlabel_staticlistdef_return; | |
1265 | ||
61e10682 | 1266 | netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
a6a8fe95 | 1267 | if (iter_addr4++ < cb->args[0]) |
8cc44579 PM |
1268 | continue; |
1269 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1270 | iface, |
1271 | netlbl_unlhsh_addr4_entry(addr4), | |
1272 | NULL, | |
1273 | &cb_arg) < 0) { | |
8cc44579 PM |
1274 | iter_addr4--; |
1275 | goto unlabel_staticlistdef_return; | |
1276 | } | |
1277 | } | |
dfd56b8b | 1278 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 | 1279 | netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { |
a6a8fe95 | 1280 | if (iter_addr6++ < cb->args[1]) |
8cc44579 PM |
1281 | continue; |
1282 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1283 | iface, |
1284 | NULL, | |
1285 | netlbl_unlhsh_addr6_entry(addr6), | |
1286 | &cb_arg) < 0) { | |
8cc44579 PM |
1287 | iter_addr6--; |
1288 | goto unlabel_staticlistdef_return; | |
1289 | } | |
1290 | } | |
61e10682 | 1291 | #endif /* IPv6 */ |
8cc44579 PM |
1292 | |
1293 | unlabel_staticlistdef_return: | |
1294 | rcu_read_unlock(); | |
0c1233ab PM |
1295 | cb->args[0] = iter_addr4; |
1296 | cb->args[1] = iter_addr6; | |
8cc44579 PM |
1297 | return skb->len; |
1298 | } | |
96cb8e33 PM |
1299 | |
1300 | /* | |
1301 | * NetLabel Generic NETLINK Command Definitions | |
1302 | */ | |
1303 | ||
4534de83 | 1304 | static const struct genl_ops netlbl_unlabel_genl_ops[] = { |
227c43c3 | 1305 | { |
8cc44579 | 1306 | .cmd = NLBL_UNLABEL_C_STATICADD, |
ef6243ac | 1307 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1308 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1309 | .doit = netlbl_unlabel_staticadd, |
1310 | .dumpit = NULL, | |
227c43c3 PE |
1311 | }, |
1312 | { | |
8cc44579 | 1313 | .cmd = NLBL_UNLABEL_C_STATICREMOVE, |
ef6243ac | 1314 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1315 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1316 | .doit = netlbl_unlabel_staticremove, |
1317 | .dumpit = NULL, | |
227c43c3 PE |
1318 | }, |
1319 | { | |
8cc44579 | 1320 | .cmd = NLBL_UNLABEL_C_STATICLIST, |
ef6243ac | 1321 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1322 | .flags = 0, |
8cc44579 PM |
1323 | .doit = NULL, |
1324 | .dumpit = netlbl_unlabel_staticlist, | |
227c43c3 PE |
1325 | }, |
1326 | { | |
8cc44579 | 1327 | .cmd = NLBL_UNLABEL_C_STATICADDDEF, |
ef6243ac | 1328 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1329 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1330 | .doit = netlbl_unlabel_staticadddef, |
1331 | .dumpit = NULL, | |
227c43c3 PE |
1332 | }, |
1333 | { | |
8cc44579 | 1334 | .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, |
ef6243ac | 1335 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1336 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1337 | .doit = netlbl_unlabel_staticremovedef, |
1338 | .dumpit = NULL, | |
227c43c3 PE |
1339 | }, |
1340 | { | |
8cc44579 | 1341 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
ef6243ac | 1342 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1343 | .flags = 0, |
8cc44579 PM |
1344 | .doit = NULL, |
1345 | .dumpit = netlbl_unlabel_staticlistdef, | |
227c43c3 PE |
1346 | }, |
1347 | { | |
96cb8e33 | 1348 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
ef6243ac | 1349 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
fd385855 | 1350 | .flags = GENL_ADMIN_PERM, |
96cb8e33 PM |
1351 | .doit = netlbl_unlabel_accept, |
1352 | .dumpit = NULL, | |
227c43c3 PE |
1353 | }, |
1354 | { | |
96cb8e33 | 1355 | .cmd = NLBL_UNLABEL_C_LIST, |
ef6243ac | 1356 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
96cb8e33 PM |
1357 | .flags = 0, |
1358 | .doit = netlbl_unlabel_list, | |
1359 | .dumpit = NULL, | |
227c43c3 | 1360 | }, |
96cb8e33 PM |
1361 | }; |
1362 | ||
56989f6d | 1363 | static struct genl_family netlbl_unlabel_gnl_family __ro_after_init = { |
489111e5 JB |
1364 | .hdrsize = 0, |
1365 | .name = NETLBL_NLTYPE_UNLABELED_NAME, | |
1366 | .version = NETLBL_PROTO_VERSION, | |
1367 | .maxattr = NLBL_UNLABEL_A_MAX, | |
3b0f31f2 | 1368 | .policy = netlbl_unlabel_genl_policy, |
489111e5 JB |
1369 | .module = THIS_MODULE, |
1370 | .ops = netlbl_unlabel_genl_ops, | |
1371 | .n_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops), | |
1372 | }; | |
1373 | ||
96cb8e33 PM |
1374 | /* |
1375 | * NetLabel Generic NETLINK Protocol Functions | |
1376 | */ | |
1377 | ||
1378 | /** | |
1379 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
1380 | * | |
1381 | * Description: | |
1382 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
1383 | * mechanism. Returns zero on success, negative values on failure. | |
1384 | * | |
1385 | */ | |
05705e4e | 1386 | int __init netlbl_unlabel_genl_init(void) |
96cb8e33 | 1387 | { |
489111e5 | 1388 | return genl_register_family(&netlbl_unlabel_gnl_family); |
96cb8e33 PM |
1389 | } |
1390 | ||
1391 | /* | |
1392 | * NetLabel KAPI Hooks | |
1393 | */ | |
1394 | ||
8cc44579 PM |
1395 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1396 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1397 | }; | |
1398 | ||
1399 | /** | |
1400 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1401 | * @size: the number of bits to use for the hash buckets | |
1402 | * | |
1403 | * Description: | |
1404 | * Initializes the unlabeled connection hash table and registers a network | |
1405 | * device notification handler. This function should only be called by the | |
1406 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1407 | * non-zero values on error. | |
1408 | * | |
1409 | */ | |
05705e4e | 1410 | int __init netlbl_unlabel_init(u32 size) |
8cc44579 PM |
1411 | { |
1412 | u32 iter; | |
1413 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1414 | ||
1415 | if (size == 0) | |
1416 | return -EINVAL; | |
1417 | ||
1418 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1419 | if (hsh_tbl == NULL) | |
1420 | return -ENOMEM; | |
1421 | hsh_tbl->size = 1 << size; | |
1422 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1423 | sizeof(struct list_head), | |
1424 | GFP_KERNEL); | |
1425 | if (hsh_tbl->tbl == NULL) { | |
1426 | kfree(hsh_tbl); | |
1427 | return -ENOMEM; | |
1428 | } | |
1429 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1430 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1431 | ||
8cc44579 | 1432 | spin_lock(&netlbl_unlhsh_lock); |
cf778b00 | 1433 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); |
8cc44579 | 1434 | spin_unlock(&netlbl_unlhsh_lock); |
8cc44579 PM |
1435 | |
1436 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
96cb8e33 PM |
1441 | /** |
1442 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1443 | * @skb: the packet |
1444 | * @family: protocol family | |
96cb8e33 PM |
1445 | * @secattr: the security attributes |
1446 | * | |
1447 | * Description: | |
1448 | * Determine the security attributes, if any, for an unlabled packet and return | |
1449 | * them in @secattr. Returns zero on success and negative values on failure. | |
1450 | * | |
1451 | */ | |
8cc44579 PM |
1452 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1453 | u16 family, | |
1454 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1455 | { |
8cc44579 PM |
1456 | struct netlbl_unlhsh_iface *iface; |
1457 | ||
1458 | rcu_read_lock(); | |
b914f3a2 | 1459 | iface = netlbl_unlhsh_search_iface(skb->skb_iif); |
8cc44579 | 1460 | if (iface == NULL) |
b914f3a2 PM |
1461 | iface = rcu_dereference(netlbl_unlhsh_def); |
1462 | if (iface == NULL || !iface->valid) | |
8cc44579 | 1463 | goto unlabel_getattr_nolabel; |
213d7f94 RH |
1464 | |
1465 | #if IS_ENABLED(CONFIG_IPV6) | |
1466 | /* When resolving a fallback label, check the sk_buff version as | |
1467 | * it is possible (e.g. SCTP) to have family = PF_INET6 while | |
1468 | * receiving ip_hdr(skb)->version = 4. | |
1469 | */ | |
1470 | if (family == PF_INET6 && ip_hdr(skb)->version == 4) | |
1471 | family = PF_INET; | |
1472 | #endif /* IPv6 */ | |
1473 | ||
8cc44579 | 1474 | switch (family) { |
56628b1d PE |
1475 | case PF_INET: { |
1476 | struct iphdr *hdr4; | |
61e10682 | 1477 | struct netlbl_af4list *addr4; |
56628b1d | 1478 | |
8cc44579 | 1479 | hdr4 = ip_hdr(skb); |
61e10682 PM |
1480 | addr4 = netlbl_af4list_search(hdr4->saddr, |
1481 | &iface->addr4_list); | |
8cc44579 PM |
1482 | if (addr4 == NULL) |
1483 | goto unlabel_getattr_nolabel; | |
61e10682 | 1484 | secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
8cc44579 | 1485 | break; |
56628b1d | 1486 | } |
dfd56b8b | 1487 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d PE |
1488 | case PF_INET6: { |
1489 | struct ipv6hdr *hdr6; | |
61e10682 | 1490 | struct netlbl_af6list *addr6; |
56628b1d | 1491 | |
8cc44579 | 1492 | hdr6 = ipv6_hdr(skb); |
61e10682 PM |
1493 | addr6 = netlbl_af6list_search(&hdr6->saddr, |
1494 | &iface->addr6_list); | |
8cc44579 PM |
1495 | if (addr6 == NULL) |
1496 | goto unlabel_getattr_nolabel; | |
61e10682 | 1497 | secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; |
8cc44579 | 1498 | break; |
56628b1d | 1499 | } |
8cc44579 PM |
1500 | #endif /* IPv6 */ |
1501 | default: | |
1502 | goto unlabel_getattr_nolabel; | |
1503 | } | |
1504 | rcu_read_unlock(); | |
1505 | ||
1506 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1507 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1508 | return 0; | |
1509 | ||
1510 | unlabel_getattr_nolabel: | |
1511 | rcu_read_unlock(); | |
c783f1ce PM |
1512 | if (netlabel_unlabel_acceptflg == 0) |
1513 | return -ENOMSG; | |
16efd454 | 1514 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1515 | return 0; |
96cb8e33 PM |
1516 | } |
1517 | ||
1518 | /** | |
1519 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1520 | * | |
1521 | * Description: | |
1522 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1523 | * and to send unlabeled network traffic by default. | |
1524 | * | |
1525 | */ | |
05705e4e | 1526 | int __init netlbl_unlabel_defconf(void) |
96cb8e33 PM |
1527 | { |
1528 | int ret_val; | |
1529 | struct netlbl_dom_map *entry; | |
95d4e6be | 1530 | struct netlbl_audit audit_info; |
32f50cde | 1531 | |
95d4e6be PM |
1532 | /* Only the kernel is allowed to call this function and the only time |
1533 | * it is called is at bootup before the audit subsystem is reporting | |
1534 | * messages so don't worry to much about these values. */ | |
1535 | security_task_getsecid(current, &audit_info.secid); | |
e1760bd5 | 1536 | audit_info.loginuid = GLOBAL_ROOT_UID; |
2532386f | 1537 | audit_info.sessionid = 0; |
96cb8e33 PM |
1538 | |
1539 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1540 | if (entry == NULL) | |
1541 | return -ENOMEM; | |
8f18e675 | 1542 | entry->family = AF_UNSPEC; |
6a8b7f0c | 1543 | entry->def.type = NETLBL_NLTYPE_UNLABELED; |
95d4e6be | 1544 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1545 | if (ret_val != 0) |
1546 | return ret_val; | |
1547 | ||
95d4e6be | 1548 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1549 | |
1550 | return 0; | |
1551 | } |