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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); | |
1160dfa1 | 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); | |
1160dfa1 | 555 | dev_put(dev); |
ec8f2375 PM |
556 | if (entry != NULL && |
557 | security_secid_to_secctx(entry->secid, | |
558 | &secctx, &secctx_len) == 0) { | |
13541b3a PM |
559 | audit_log_format(audit_buf, " sec_obj=%s", secctx); |
560 | security_release_secctx(secctx, secctx_len); | |
561 | } | |
ec8f2375 | 562 | audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0); |
13541b3a PM |
563 | audit_log_end(audit_buf); |
564 | } | |
565 | ||
ec8f2375 PM |
566 | if (entry == NULL) |
567 | return -ENOENT; | |
568 | ||
6b262232 | 569 | kfree_rcu(entry, rcu); |
ec8f2375 | 570 | return 0; |
8cc44579 PM |
571 | } |
572 | #endif /* IPv6 */ | |
573 | ||
574 | /** | |
575 | * netlbl_unlhsh_condremove_iface - Remove an interface entry | |
576 | * @iface: the interface entry | |
577 | * | |
578 | * Description: | |
579 | * Remove an interface entry from the unlabeled connection hash table if it is | |
580 | * empty. An interface entry is considered to be empty if there are no | |
581 | * address entries assigned to it. | |
582 | * | |
583 | */ | |
584 | static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface) | |
585 | { | |
61e10682 | 586 | struct netlbl_af4list *iter4; |
dfd56b8b | 587 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
588 | struct netlbl_af6list *iter6; |
589 | #endif /* IPv6 */ | |
8cc44579 PM |
590 | |
591 | spin_lock(&netlbl_unlhsh_lock); | |
61e10682 PM |
592 | netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list) |
593 | goto unlhsh_condremove_failure; | |
dfd56b8b | 594 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
595 | netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list) |
596 | goto unlhsh_condremove_failure; | |
597 | #endif /* IPv6 */ | |
8cc44579 PM |
598 | iface->valid = 0; |
599 | if (iface->ifindex > 0) | |
600 | list_del_rcu(&iface->list); | |
601 | else | |
a9b3cd7f | 602 | RCU_INIT_POINTER(netlbl_unlhsh_def, NULL); |
8cc44579 PM |
603 | spin_unlock(&netlbl_unlhsh_lock); |
604 | ||
605 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
606 | return; | |
607 | ||
608 | unlhsh_condremove_failure: | |
609 | spin_unlock(&netlbl_unlhsh_lock); | |
8cc44579 PM |
610 | } |
611 | ||
612 | /** | |
613 | * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table | |
614 | * @net: network namespace | |
615 | * @dev_name: interface name | |
616 | * @addr: IP address in network byte order | |
617 | * @mask: address mask in network byte order | |
618 | * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6) | |
13541b3a | 619 | * @audit_info: NetLabel audit information |
8cc44579 PM |
620 | * |
621 | * Description: | |
622 | * Removes and existing entry from the unlabeled connection hash table. | |
623 | * Returns zero on success, negative values on failure. | |
624 | * | |
625 | */ | |
6c2e8ac0 PM |
626 | int netlbl_unlhsh_remove(struct net *net, |
627 | const char *dev_name, | |
628 | const void *addr, | |
629 | const void *mask, | |
630 | u32 addr_len, | |
631 | struct netlbl_audit *audit_info) | |
8cc44579 PM |
632 | { |
633 | int ret_val; | |
634 | struct net_device *dev; | |
635 | struct netlbl_unlhsh_iface *iface; | |
636 | ||
637 | if (addr_len != sizeof(struct in_addr) && | |
638 | addr_len != sizeof(struct in6_addr)) | |
639 | return -EINVAL; | |
640 | ||
641 | rcu_read_lock(); | |
642 | if (dev_name != NULL) { | |
122ec6ff | 643 | dev = dev_get_by_name_rcu(net, dev_name); |
8cc44579 PM |
644 | if (dev == NULL) { |
645 | ret_val = -ENODEV; | |
646 | goto unlhsh_remove_return; | |
647 | } | |
648 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
8cc44579 PM |
649 | } else |
650 | iface = rcu_dereference(netlbl_unlhsh_def); | |
651 | if (iface == NULL) { | |
652 | ret_val = -ENOENT; | |
653 | goto unlhsh_remove_return; | |
654 | } | |
655 | switch (addr_len) { | |
656 | case sizeof(struct in_addr): | |
13541b3a PM |
657 | ret_val = netlbl_unlhsh_remove_addr4(net, |
658 | iface, addr, mask, | |
659 | audit_info); | |
8cc44579 | 660 | break; |
dfd56b8b | 661 | #if IS_ENABLED(CONFIG_IPV6) |
8cc44579 | 662 | case sizeof(struct in6_addr): |
13541b3a PM |
663 | ret_val = netlbl_unlhsh_remove_addr6(net, |
664 | iface, addr, mask, | |
665 | audit_info); | |
8cc44579 PM |
666 | break; |
667 | #endif /* IPv6 */ | |
668 | default: | |
669 | ret_val = -EINVAL; | |
670 | } | |
671 | if (ret_val == 0) { | |
672 | netlbl_unlhsh_condremove_iface(iface); | |
673 | atomic_dec(&netlabel_mgmt_protocount); | |
674 | } | |
675 | ||
676 | unlhsh_remove_return: | |
677 | rcu_read_unlock(); | |
678 | return ret_val; | |
679 | } | |
680 | ||
681 | /* | |
682 | * General Helper Functions | |
683 | */ | |
684 | ||
685 | /** | |
686 | * netlbl_unlhsh_netdev_handler - Network device notification handler | |
687 | * @this: notifier block | |
688 | * @event: the event | |
351638e7 | 689 | * @ptr: the netdevice notifier info (cast to void) |
8cc44579 PM |
690 | * |
691 | * Description: | |
692 | * Handle network device events, although at present all we care about is a | |
693 | * network device going away. In the case of a device going away we clear any | |
694 | * related entries from the unlabeled connection hash table. | |
695 | * | |
696 | */ | |
697 | static int netlbl_unlhsh_netdev_handler(struct notifier_block *this, | |
351638e7 | 698 | unsigned long event, void *ptr) |
8cc44579 | 699 | { |
351638e7 | 700 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
8cc44579 PM |
701 | struct netlbl_unlhsh_iface *iface = NULL; |
702 | ||
721499e8 | 703 | if (!net_eq(dev_net(dev), &init_net)) |
8cc44579 PM |
704 | return NOTIFY_DONE; |
705 | ||
706 | /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */ | |
707 | if (event == NETDEV_DOWN) { | |
708 | spin_lock(&netlbl_unlhsh_lock); | |
709 | iface = netlbl_unlhsh_search_iface(dev->ifindex); | |
710 | if (iface != NULL && iface->valid) { | |
711 | iface->valid = 0; | |
712 | list_del_rcu(&iface->list); | |
713 | } else | |
714 | iface = NULL; | |
715 | spin_unlock(&netlbl_unlhsh_lock); | |
716 | } | |
717 | ||
718 | if (iface != NULL) | |
719 | call_rcu(&iface->rcu, netlbl_unlhsh_free_iface); | |
720 | ||
721 | return NOTIFY_DONE; | |
722 | } | |
32f50cde PM |
723 | |
724 | /** | |
725 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag | |
726 | * @value: desired value | |
95d4e6be | 727 | * @audit_info: NetLabel audit information |
32f50cde PM |
728 | * |
729 | * Description: | |
730 | * Set the value of the unlabeled accept flag to @value. | |
731 | * | |
732 | */ | |
95d4e6be PM |
733 | static void netlbl_unlabel_acceptflg_set(u8 value, |
734 | struct netlbl_audit *audit_info) | |
32f50cde | 735 | { |
95d4e6be PM |
736 | struct audit_buffer *audit_buf; |
737 | u8 old_val; | |
738 | ||
4be2700f | 739 | old_val = netlabel_unlabel_acceptflg; |
cd28786d | 740 | netlabel_unlabel_acceptflg = value; |
95d4e6be PM |
741 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, |
742 | audit_info); | |
de64688f PM |
743 | if (audit_buf != NULL) { |
744 | audit_log_format(audit_buf, | |
745 | " unlbl_accept=%u old=%u", value, old_val); | |
746 | audit_log_end(audit_buf); | |
747 | } | |
32f50cde PM |
748 | } |
749 | ||
8cc44579 PM |
750 | /** |
751 | * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information | |
752 | * @info: the Generic NETLINK info block | |
753 | * @addr: the IP address | |
754 | * @mask: the IP address mask | |
755 | * @len: the address length | |
756 | * | |
757 | * Description: | |
758 | * Examine the Generic NETLINK message and extract the IP address information. | |
759 | * Returns zero on success, negative values on failure. | |
760 | * | |
761 | */ | |
762 | static int netlbl_unlabel_addrinfo_get(struct genl_info *info, | |
763 | void **addr, | |
764 | void **mask, | |
765 | u32 *len) | |
766 | { | |
767 | u32 addr_len; | |
768 | ||
f88b4c01 ST |
769 | if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR] && |
770 | info->attrs[NLBL_UNLABEL_A_IPV4MASK]) { | |
8cc44579 PM |
771 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); |
772 | if (addr_len != sizeof(struct in_addr) && | |
773 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK])) | |
774 | return -EINVAL; | |
775 | *len = addr_len; | |
776 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]); | |
777 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]); | |
778 | return 0; | |
779 | } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) { | |
780 | addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
781 | if (addr_len != sizeof(struct in6_addr) && | |
782 | addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK])) | |
783 | return -EINVAL; | |
784 | *len = addr_len; | |
785 | *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]); | |
786 | *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]); | |
787 | return 0; | |
788 | } | |
789 | ||
790 | return -EINVAL; | |
791 | } | |
792 | ||
96cb8e33 PM |
793 | /* |
794 | * NetLabel Command Handlers | |
795 | */ | |
796 | ||
797 | /** | |
798 | * netlbl_unlabel_accept - Handle an ACCEPT message | |
799 | * @skb: the NETLINK buffer | |
800 | * @info: the Generic NETLINK info block | |
801 | * | |
802 | * Description: | |
803 | * Process a user generated ACCEPT message and set the accept flag accordingly. | |
804 | * Returns zero on success, negative values on failure. | |
805 | * | |
806 | */ | |
807 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) | |
808 | { | |
fd385855 | 809 | u8 value; |
95d4e6be | 810 | struct netlbl_audit audit_info; |
96cb8e33 | 811 | |
fd385855 PM |
812 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
813 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); | |
96cb8e33 | 814 | if (value == 1 || value == 0) { |
f7e0318a | 815 | netlbl_netlink_auditinfo(&audit_info); |
95d4e6be | 816 | netlbl_unlabel_acceptflg_set(value, &audit_info); |
32f50cde | 817 | return 0; |
96cb8e33 PM |
818 | } |
819 | } | |
820 | ||
32f50cde | 821 | return -EINVAL; |
96cb8e33 PM |
822 | } |
823 | ||
824 | /** | |
825 | * netlbl_unlabel_list - Handle a LIST message | |
826 | * @skb: the NETLINK buffer | |
827 | * @info: the Generic NETLINK info block | |
828 | * | |
829 | * Description: | |
830 | * Process a user generated LIST message and respond with the current status. | |
831 | * Returns zero on success, negative values on failure. | |
832 | * | |
833 | */ | |
834 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) | |
835 | { | |
fd385855 | 836 | int ret_val = -EINVAL; |
96cb8e33 | 837 | struct sk_buff *ans_skb; |
fd385855 | 838 | void *data; |
96cb8e33 | 839 | |
339bf98f | 840 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
96cb8e33 PM |
841 | if (ans_skb == NULL) |
842 | goto list_failure; | |
17c157c8 TG |
843 | data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family, |
844 | 0, NLBL_UNLABEL_C_LIST); | |
fd385855 PM |
845 | if (data == NULL) { |
846 | ret_val = -ENOMEM; | |
96cb8e33 | 847 | goto list_failure; |
fd385855 | 848 | } |
96cb8e33 | 849 | |
fd385855 PM |
850 | ret_val = nla_put_u8(ans_skb, |
851 | NLBL_UNLABEL_A_ACPTFLG, | |
cd28786d | 852 | netlabel_unlabel_acceptflg); |
96cb8e33 PM |
853 | if (ret_val != 0) |
854 | goto list_failure; | |
855 | ||
fd385855 | 856 | genlmsg_end(ans_skb, data); |
fe785bee | 857 | return genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
858 | |
859 | list_failure: | |
b08d5840 | 860 | kfree_skb(ans_skb); |
96cb8e33 PM |
861 | return ret_val; |
862 | } | |
863 | ||
8cc44579 PM |
864 | /** |
865 | * netlbl_unlabel_staticadd - Handle a STATICADD message | |
866 | * @skb: the NETLINK buffer | |
867 | * @info: the Generic NETLINK info block | |
868 | * | |
869 | * Description: | |
870 | * Process a user generated STATICADD message and add a new unlabeled | |
871 | * connection entry to the hash table. Returns zero on success, negative | |
872 | * values on failure. | |
873 | * | |
874 | */ | |
875 | static int netlbl_unlabel_staticadd(struct sk_buff *skb, | |
876 | struct genl_info *info) | |
877 | { | |
878 | int ret_val; | |
879 | char *dev_name; | |
880 | void *addr; | |
881 | void *mask; | |
882 | u32 addr_len; | |
883 | u32 secid; | |
13541b3a | 884 | struct netlbl_audit audit_info; |
8cc44579 PM |
885 | |
886 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
887 | * single entry. However, allow users to create two entries, one each | |
2cd0e8db | 888 | * for IPv4 and IPv6, with the same LSM security context which should |
8cc44579 PM |
889 | * achieve the same result. */ |
890 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
891 | !info->attrs[NLBL_UNLABEL_A_IFACE] || | |
892 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
893 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
894 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
895 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
896 | return -EINVAL; | |
897 | ||
f7e0318a | 898 | netlbl_netlink_auditinfo(&audit_info); |
13541b3a | 899 | |
8cc44579 PM |
900 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
901 | if (ret_val != 0) | |
902 | return ret_val; | |
903 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
904 | ret_val = security_secctx_to_secid( | |
905 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
906 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
907 | &secid); | |
908 | if (ret_val != 0) | |
909 | return ret_val; | |
910 | ||
911 | return netlbl_unlhsh_add(&init_net, | |
13541b3a PM |
912 | dev_name, addr, mask, addr_len, secid, |
913 | &audit_info); | |
8cc44579 PM |
914 | } |
915 | ||
916 | /** | |
917 | * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message | |
918 | * @skb: the NETLINK buffer | |
919 | * @info: the Generic NETLINK info block | |
920 | * | |
921 | * Description: | |
922 | * Process a user generated STATICADDDEF message and add a new default | |
923 | * unlabeled connection entry. Returns zero on success, negative values on | |
924 | * failure. | |
925 | * | |
926 | */ | |
927 | static int netlbl_unlabel_staticadddef(struct sk_buff *skb, | |
928 | struct genl_info *info) | |
929 | { | |
930 | int ret_val; | |
931 | void *addr; | |
932 | void *mask; | |
933 | u32 addr_len; | |
934 | u32 secid; | |
13541b3a | 935 | struct netlbl_audit audit_info; |
8cc44579 PM |
936 | |
937 | /* Don't allow users to add both IPv4 and IPv6 addresses for a | |
938 | * single entry. However, allow users to create two entries, one each | |
939 | * for IPv4 and IPv6, with the same LSM security context which should | |
940 | * achieve the same result. */ | |
941 | if (!info->attrs[NLBL_UNLABEL_A_SECCTX] || | |
942 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
943 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
944 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
945 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
946 | return -EINVAL; | |
947 | ||
f7e0318a | 948 | netlbl_netlink_auditinfo(&audit_info); |
13541b3a | 949 | |
8cc44579 PM |
950 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
951 | if (ret_val != 0) | |
952 | return ret_val; | |
953 | ret_val = security_secctx_to_secid( | |
954 | nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
955 | nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]), | |
956 | &secid); | |
957 | if (ret_val != 0) | |
958 | return ret_val; | |
959 | ||
13541b3a PM |
960 | return netlbl_unlhsh_add(&init_net, |
961 | NULL, addr, mask, addr_len, secid, | |
962 | &audit_info); | |
8cc44579 PM |
963 | } |
964 | ||
965 | /** | |
966 | * netlbl_unlabel_staticremove - Handle a STATICREMOVE message | |
967 | * @skb: the NETLINK buffer | |
968 | * @info: the Generic NETLINK info block | |
969 | * | |
970 | * Description: | |
971 | * Process a user generated STATICREMOVE message and remove the specified | |
972 | * unlabeled connection entry. Returns zero on success, negative values on | |
973 | * failure. | |
974 | * | |
975 | */ | |
976 | static int netlbl_unlabel_staticremove(struct sk_buff *skb, | |
977 | struct genl_info *info) | |
978 | { | |
979 | int ret_val; | |
980 | char *dev_name; | |
981 | void *addr; | |
982 | void *mask; | |
983 | u32 addr_len; | |
13541b3a | 984 | struct netlbl_audit audit_info; |
8cc44579 PM |
985 | |
986 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
987 | * IPv4 and IPv6 in the same entry. */ | |
988 | if (!info->attrs[NLBL_UNLABEL_A_IFACE] || | |
989 | !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
990 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
991 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
992 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
993 | return -EINVAL; | |
994 | ||
f7e0318a | 995 | netlbl_netlink_auditinfo(&audit_info); |
13541b3a | 996 | |
8cc44579 PM |
997 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
998 | if (ret_val != 0) | |
999 | return ret_val; | |
1000 | dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]); | |
1001 | ||
13541b3a PM |
1002 | return netlbl_unlhsh_remove(&init_net, |
1003 | dev_name, addr, mask, addr_len, | |
1004 | &audit_info); | |
8cc44579 PM |
1005 | } |
1006 | ||
1007 | /** | |
1008 | * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message | |
1009 | * @skb: the NETLINK buffer | |
1010 | * @info: the Generic NETLINK info block | |
1011 | * | |
1012 | * Description: | |
1013 | * Process a user generated STATICREMOVEDEF message and remove the default | |
1014 | * unlabeled connection entry. Returns zero on success, negative values on | |
1015 | * failure. | |
1016 | * | |
1017 | */ | |
1018 | static int netlbl_unlabel_staticremovedef(struct sk_buff *skb, | |
1019 | struct genl_info *info) | |
1020 | { | |
1021 | int ret_val; | |
1022 | void *addr; | |
1023 | void *mask; | |
1024 | u32 addr_len; | |
13541b3a | 1025 | struct netlbl_audit audit_info; |
8cc44579 PM |
1026 | |
1027 | /* See the note in netlbl_unlabel_staticadd() about not allowing both | |
1028 | * IPv4 and IPv6 in the same entry. */ | |
1029 | if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] || | |
1030 | !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^ | |
1031 | (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] || | |
1032 | !info->attrs[NLBL_UNLABEL_A_IPV6MASK]))) | |
1033 | return -EINVAL; | |
1034 | ||
f7e0318a | 1035 | netlbl_netlink_auditinfo(&audit_info); |
13541b3a | 1036 | |
8cc44579 PM |
1037 | ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len); |
1038 | if (ret_val != 0) | |
1039 | return ret_val; | |
1040 | ||
13541b3a PM |
1041 | return netlbl_unlhsh_remove(&init_net, |
1042 | NULL, addr, mask, addr_len, | |
1043 | &audit_info); | |
8cc44579 PM |
1044 | } |
1045 | ||
1046 | ||
1047 | /** | |
1048 | * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF] | |
1049 | * @cmd: command/message | |
1050 | * @iface: the interface entry | |
1051 | * @addr4: the IPv4 address entry | |
1052 | * @addr6: the IPv6 address entry | |
1053 | * @arg: the netlbl_unlhsh_walk_arg structure | |
1054 | * | |
1055 | * Description: | |
1056 | * This function is designed to be used to generate a response for a | |
1057 | * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6 | |
1058 | * can be specified, not both, the other unspecified entry should be set to | |
1059 | * NULL by the caller. Returns the size of the message on success, negative | |
1060 | * values on failure. | |
1061 | * | |
1062 | */ | |
1063 | static int netlbl_unlabel_staticlist_gen(u32 cmd, | |
1064 | const struct netlbl_unlhsh_iface *iface, | |
1065 | const struct netlbl_unlhsh_addr4 *addr4, | |
1066 | const struct netlbl_unlhsh_addr6 *addr6, | |
1067 | void *arg) | |
1068 | { | |
1069 | int ret_val = -ENOMEM; | |
1070 | struct netlbl_unlhsh_walk_arg *cb_arg = arg; | |
1071 | struct net_device *dev; | |
1072 | void *data; | |
1073 | u32 secid; | |
1074 | char *secctx; | |
1075 | u32 secctx_len; | |
1076 | ||
15e47304 | 1077 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid, |
8cc44579 PM |
1078 | cb_arg->seq, &netlbl_unlabel_gnl_family, |
1079 | NLM_F_MULTI, cmd); | |
1080 | if (data == NULL) | |
1081 | goto list_cb_failure; | |
1082 | ||
1083 | if (iface->ifindex > 0) { | |
1084 | dev = dev_get_by_index(&init_net, iface->ifindex); | |
794eb6bf JJ |
1085 | if (!dev) { |
1086 | ret_val = -ENODEV; | |
1087 | goto list_cb_failure; | |
1088 | } | |
8cc44579 PM |
1089 | ret_val = nla_put_string(cb_arg->skb, |
1090 | NLBL_UNLABEL_A_IFACE, dev->name); | |
1091 | dev_put(dev); | |
1092 | if (ret_val != 0) | |
1093 | goto list_cb_failure; | |
1094 | } | |
1095 | ||
1096 | if (addr4) { | |
1097 | struct in_addr addr_struct; | |
1098 | ||
61e10682 | 1099 | addr_struct.s_addr = addr4->list.addr; |
930345ea JB |
1100 | ret_val = nla_put_in_addr(cb_arg->skb, |
1101 | NLBL_UNLABEL_A_IPV4ADDR, | |
1102 | addr_struct.s_addr); | |
8cc44579 PM |
1103 | if (ret_val != 0) |
1104 | goto list_cb_failure; | |
1105 | ||
61e10682 | 1106 | addr_struct.s_addr = addr4->list.mask; |
930345ea JB |
1107 | ret_val = nla_put_in_addr(cb_arg->skb, |
1108 | NLBL_UNLABEL_A_IPV4MASK, | |
1109 | addr_struct.s_addr); | |
8cc44579 PM |
1110 | if (ret_val != 0) |
1111 | goto list_cb_failure; | |
1112 | ||
1113 | secid = addr4->secid; | |
1114 | } else { | |
930345ea JB |
1115 | ret_val = nla_put_in6_addr(cb_arg->skb, |
1116 | NLBL_UNLABEL_A_IPV6ADDR, | |
1117 | &addr6->list.addr); | |
8cc44579 PM |
1118 | if (ret_val != 0) |
1119 | goto list_cb_failure; | |
1120 | ||
930345ea JB |
1121 | ret_val = nla_put_in6_addr(cb_arg->skb, |
1122 | NLBL_UNLABEL_A_IPV6MASK, | |
1123 | &addr6->list.mask); | |
8cc44579 PM |
1124 | if (ret_val != 0) |
1125 | goto list_cb_failure; | |
1126 | ||
1127 | secid = addr6->secid; | |
1128 | } | |
1129 | ||
1130 | ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len); | |
1131 | if (ret_val != 0) | |
1132 | goto list_cb_failure; | |
1133 | ret_val = nla_put(cb_arg->skb, | |
1134 | NLBL_UNLABEL_A_SECCTX, | |
1135 | secctx_len, | |
1136 | secctx); | |
1137 | security_release_secctx(secctx, secctx_len); | |
1138 | if (ret_val != 0) | |
1139 | goto list_cb_failure; | |
1140 | ||
1141 | cb_arg->seq++; | |
053c095a JB |
1142 | genlmsg_end(cb_arg->skb, data); |
1143 | return 0; | |
8cc44579 PM |
1144 | |
1145 | list_cb_failure: | |
1146 | genlmsg_cancel(cb_arg->skb, data); | |
1147 | return ret_val; | |
1148 | } | |
1149 | ||
1150 | /** | |
1151 | * netlbl_unlabel_staticlist - Handle a STATICLIST message | |
1152 | * @skb: the NETLINK buffer | |
1153 | * @cb: the NETLINK callback | |
1154 | * | |
1155 | * Description: | |
1156 | * Process a user generated STATICLIST message and dump the unlabeled | |
1157 | * connection hash table in a form suitable for use in a kernel generated | |
1158 | * STATICLIST message. Returns the length of @skb. | |
1159 | * | |
1160 | */ | |
1161 | static int netlbl_unlabel_staticlist(struct sk_buff *skb, | |
1162 | struct netlink_callback *cb) | |
1163 | { | |
1164 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1165 | u32 skip_bkt = cb->args[0]; | |
1166 | u32 skip_chain = cb->args[1]; | |
866358ec | 1167 | u32 skip_addr4 = cb->args[2]; |
1ba86d43 | 1168 | u32 iter_bkt, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; |
8cc44579 | 1169 | struct netlbl_unlhsh_iface *iface; |
56196701 | 1170 | struct list_head *iter_list; |
61e10682 | 1171 | struct netlbl_af4list *addr4; |
dfd56b8b | 1172 | #if IS_ENABLED(CONFIG_IPV6) |
866358ec | 1173 | u32 skip_addr6 = cb->args[3]; |
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; | |
866358ec | 1184 | iter_bkt++) { |
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) { | |
866358ec | 1192 | if (iter_addr4++ < skip_addr4) |
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 | } | |
866358ec PM |
1205 | iter_addr4 = 0; |
1206 | skip_addr4 = 0; | |
dfd56b8b | 1207 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1208 | netlbl_af6list_foreach_rcu(addr6, |
1209 | &iface->addr6_list) { | |
866358ec | 1210 | if (iter_addr6++ < skip_addr6) |
8cc44579 PM |
1211 | continue; |
1212 | if (netlbl_unlabel_staticlist_gen( | |
61e10682 PM |
1213 | NLBL_UNLABEL_C_STATICLIST, |
1214 | iface, | |
1215 | NULL, | |
1216 | netlbl_unlhsh_addr6_entry(addr6), | |
1217 | &cb_arg) < 0) { | |
8cc44579 PM |
1218 | iter_addr6--; |
1219 | iter_chain--; | |
1220 | goto unlabel_staticlist_return; | |
1221 | } | |
1222 | } | |
866358ec PM |
1223 | iter_addr6 = 0; |
1224 | skip_addr6 = 0; | |
61e10682 | 1225 | #endif /* IPv6 */ |
8cc44579 | 1226 | } |
866358ec PM |
1227 | iter_chain = 0; |
1228 | skip_chain = 0; | |
8cc44579 PM |
1229 | } |
1230 | ||
1231 | unlabel_staticlist_return: | |
1232 | rcu_read_unlock(); | |
0c1233ab PM |
1233 | cb->args[0] = iter_bkt; |
1234 | cb->args[1] = iter_chain; | |
1235 | cb->args[2] = iter_addr4; | |
1236 | cb->args[3] = iter_addr6; | |
8cc44579 PM |
1237 | return skb->len; |
1238 | } | |
1239 | ||
1240 | /** | |
1241 | * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message | |
1242 | * @skb: the NETLINK buffer | |
1243 | * @cb: the NETLINK callback | |
1244 | * | |
1245 | * Description: | |
1246 | * Process a user generated STATICLISTDEF message and dump the default | |
1247 | * unlabeled connection entry in a form suitable for use in a kernel generated | |
1248 | * STATICLISTDEF message. Returns the length of @skb. | |
1249 | * | |
1250 | */ | |
1251 | static int netlbl_unlabel_staticlistdef(struct sk_buff *skb, | |
1252 | struct netlink_callback *cb) | |
1253 | { | |
1254 | struct netlbl_unlhsh_walk_arg cb_arg; | |
1255 | struct netlbl_unlhsh_iface *iface; | |
a6a8fe95 | 1256 | u32 iter_addr4 = 0, iter_addr6 = 0; |
61e10682 | 1257 | struct netlbl_af4list *addr4; |
dfd56b8b | 1258 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 PM |
1259 | struct netlbl_af6list *addr6; |
1260 | #endif | |
8cc44579 PM |
1261 | |
1262 | cb_arg.nl_cb = cb; | |
1263 | cb_arg.skb = skb; | |
1264 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
1265 | ||
1266 | rcu_read_lock(); | |
1267 | iface = rcu_dereference(netlbl_unlhsh_def); | |
1268 | if (iface == NULL || !iface->valid) | |
1269 | goto unlabel_staticlistdef_return; | |
1270 | ||
61e10682 | 1271 | netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
a6a8fe95 | 1272 | if (iter_addr4++ < cb->args[0]) |
8cc44579 PM |
1273 | continue; |
1274 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1275 | iface, |
1276 | netlbl_unlhsh_addr4_entry(addr4), | |
1277 | NULL, | |
1278 | &cb_arg) < 0) { | |
8cc44579 PM |
1279 | iter_addr4--; |
1280 | goto unlabel_staticlistdef_return; | |
1281 | } | |
1282 | } | |
dfd56b8b | 1283 | #if IS_ENABLED(CONFIG_IPV6) |
61e10682 | 1284 | netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { |
a6a8fe95 | 1285 | if (iter_addr6++ < cb->args[1]) |
8cc44579 PM |
1286 | continue; |
1287 | if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, | |
61e10682 PM |
1288 | iface, |
1289 | NULL, | |
1290 | netlbl_unlhsh_addr6_entry(addr6), | |
1291 | &cb_arg) < 0) { | |
8cc44579 PM |
1292 | iter_addr6--; |
1293 | goto unlabel_staticlistdef_return; | |
1294 | } | |
1295 | } | |
61e10682 | 1296 | #endif /* IPv6 */ |
8cc44579 PM |
1297 | |
1298 | unlabel_staticlistdef_return: | |
1299 | rcu_read_unlock(); | |
0c1233ab PM |
1300 | cb->args[0] = iter_addr4; |
1301 | cb->args[1] = iter_addr6; | |
8cc44579 PM |
1302 | return skb->len; |
1303 | } | |
96cb8e33 PM |
1304 | |
1305 | /* | |
1306 | * NetLabel Generic NETLINK Command Definitions | |
1307 | */ | |
1308 | ||
66a9b928 | 1309 | static const struct genl_small_ops netlbl_unlabel_genl_ops[] = { |
227c43c3 | 1310 | { |
8cc44579 | 1311 | .cmd = NLBL_UNLABEL_C_STATICADD, |
ef6243ac | 1312 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1313 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1314 | .doit = netlbl_unlabel_staticadd, |
1315 | .dumpit = NULL, | |
227c43c3 PE |
1316 | }, |
1317 | { | |
8cc44579 | 1318 | .cmd = NLBL_UNLABEL_C_STATICREMOVE, |
ef6243ac | 1319 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1320 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1321 | .doit = netlbl_unlabel_staticremove, |
1322 | .dumpit = NULL, | |
227c43c3 PE |
1323 | }, |
1324 | { | |
8cc44579 | 1325 | .cmd = NLBL_UNLABEL_C_STATICLIST, |
ef6243ac | 1326 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1327 | .flags = 0, |
8cc44579 PM |
1328 | .doit = NULL, |
1329 | .dumpit = netlbl_unlabel_staticlist, | |
227c43c3 PE |
1330 | }, |
1331 | { | |
8cc44579 | 1332 | .cmd = NLBL_UNLABEL_C_STATICADDDEF, |
ef6243ac | 1333 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1334 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1335 | .doit = netlbl_unlabel_staticadddef, |
1336 | .dumpit = NULL, | |
227c43c3 PE |
1337 | }, |
1338 | { | |
8cc44579 | 1339 | .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, |
ef6243ac | 1340 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1341 | .flags = GENL_ADMIN_PERM, |
8cc44579 PM |
1342 | .doit = netlbl_unlabel_staticremovedef, |
1343 | .dumpit = NULL, | |
227c43c3 PE |
1344 | }, |
1345 | { | |
8cc44579 | 1346 | .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
ef6243ac | 1347 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
8cc44579 | 1348 | .flags = 0, |
8cc44579 PM |
1349 | .doit = NULL, |
1350 | .dumpit = netlbl_unlabel_staticlistdef, | |
227c43c3 PE |
1351 | }, |
1352 | { | |
96cb8e33 | 1353 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
ef6243ac | 1354 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
fd385855 | 1355 | .flags = GENL_ADMIN_PERM, |
96cb8e33 PM |
1356 | .doit = netlbl_unlabel_accept, |
1357 | .dumpit = NULL, | |
227c43c3 PE |
1358 | }, |
1359 | { | |
96cb8e33 | 1360 | .cmd = NLBL_UNLABEL_C_LIST, |
ef6243ac | 1361 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
96cb8e33 PM |
1362 | .flags = 0, |
1363 | .doit = netlbl_unlabel_list, | |
1364 | .dumpit = NULL, | |
227c43c3 | 1365 | }, |
96cb8e33 PM |
1366 | }; |
1367 | ||
56989f6d | 1368 | static struct genl_family netlbl_unlabel_gnl_family __ro_after_init = { |
489111e5 JB |
1369 | .hdrsize = 0, |
1370 | .name = NETLBL_NLTYPE_UNLABELED_NAME, | |
1371 | .version = NETLBL_PROTO_VERSION, | |
1372 | .maxattr = NLBL_UNLABEL_A_MAX, | |
3b0f31f2 | 1373 | .policy = netlbl_unlabel_genl_policy, |
489111e5 | 1374 | .module = THIS_MODULE, |
66a9b928 JK |
1375 | .small_ops = netlbl_unlabel_genl_ops, |
1376 | .n_small_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops), | |
9c5d03d3 | 1377 | .resv_start_op = NLBL_UNLABEL_C_STATICLISTDEF + 1, |
489111e5 JB |
1378 | }; |
1379 | ||
96cb8e33 PM |
1380 | /* |
1381 | * NetLabel Generic NETLINK Protocol Functions | |
1382 | */ | |
1383 | ||
1384 | /** | |
1385 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component | |
1386 | * | |
1387 | * Description: | |
1388 | * Register the unlabeled packet NetLabel component with the Generic NETLINK | |
1389 | * mechanism. Returns zero on success, negative values on failure. | |
1390 | * | |
1391 | */ | |
05705e4e | 1392 | int __init netlbl_unlabel_genl_init(void) |
96cb8e33 | 1393 | { |
489111e5 | 1394 | return genl_register_family(&netlbl_unlabel_gnl_family); |
96cb8e33 PM |
1395 | } |
1396 | ||
1397 | /* | |
1398 | * NetLabel KAPI Hooks | |
1399 | */ | |
1400 | ||
8cc44579 PM |
1401 | static struct notifier_block netlbl_unlhsh_netdev_notifier = { |
1402 | .notifier_call = netlbl_unlhsh_netdev_handler, | |
1403 | }; | |
1404 | ||
1405 | /** | |
1406 | * netlbl_unlabel_init - Initialize the unlabeled connection hash table | |
1407 | * @size: the number of bits to use for the hash buckets | |
1408 | * | |
1409 | * Description: | |
1410 | * Initializes the unlabeled connection hash table and registers a network | |
1411 | * device notification handler. This function should only be called by the | |
1412 | * NetLabel subsystem itself during initialization. Returns zero on success, | |
1413 | * non-zero values on error. | |
1414 | * | |
1415 | */ | |
05705e4e | 1416 | int __init netlbl_unlabel_init(u32 size) |
8cc44579 PM |
1417 | { |
1418 | u32 iter; | |
1419 | struct netlbl_unlhsh_tbl *hsh_tbl; | |
1420 | ||
1421 | if (size == 0) | |
1422 | return -EINVAL; | |
1423 | ||
1424 | hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL); | |
1425 | if (hsh_tbl == NULL) | |
1426 | return -ENOMEM; | |
1427 | hsh_tbl->size = 1 << size; | |
1428 | hsh_tbl->tbl = kcalloc(hsh_tbl->size, | |
1429 | sizeof(struct list_head), | |
1430 | GFP_KERNEL); | |
1431 | if (hsh_tbl->tbl == NULL) { | |
1432 | kfree(hsh_tbl); | |
1433 | return -ENOMEM; | |
1434 | } | |
1435 | for (iter = 0; iter < hsh_tbl->size; iter++) | |
1436 | INIT_LIST_HEAD(&hsh_tbl->tbl[iter]); | |
1437 | ||
8cc44579 | 1438 | spin_lock(&netlbl_unlhsh_lock); |
cf778b00 | 1439 | rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); |
8cc44579 | 1440 | spin_unlock(&netlbl_unlhsh_lock); |
8cc44579 PM |
1441 | |
1442 | register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier); | |
1443 | ||
1444 | return 0; | |
1445 | } | |
1446 | ||
96cb8e33 PM |
1447 | /** |
1448 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet | |
8cc44579 PM |
1449 | * @skb: the packet |
1450 | * @family: protocol family | |
96cb8e33 PM |
1451 | * @secattr: the security attributes |
1452 | * | |
1453 | * Description: | |
1454 | * Determine the security attributes, if any, for an unlabled packet and return | |
1455 | * them in @secattr. Returns zero on success and negative values on failure. | |
1456 | * | |
1457 | */ | |
8cc44579 PM |
1458 | int netlbl_unlabel_getattr(const struct sk_buff *skb, |
1459 | u16 family, | |
1460 | struct netlbl_lsm_secattr *secattr) | |
96cb8e33 | 1461 | { |
8cc44579 PM |
1462 | struct netlbl_unlhsh_iface *iface; |
1463 | ||
1464 | rcu_read_lock(); | |
b914f3a2 | 1465 | iface = netlbl_unlhsh_search_iface(skb->skb_iif); |
8cc44579 | 1466 | if (iface == NULL) |
b914f3a2 PM |
1467 | iface = rcu_dereference(netlbl_unlhsh_def); |
1468 | if (iface == NULL || !iface->valid) | |
8cc44579 | 1469 | goto unlabel_getattr_nolabel; |
213d7f94 RH |
1470 | |
1471 | #if IS_ENABLED(CONFIG_IPV6) | |
1472 | /* When resolving a fallback label, check the sk_buff version as | |
1473 | * it is possible (e.g. SCTP) to have family = PF_INET6 while | |
1474 | * receiving ip_hdr(skb)->version = 4. | |
1475 | */ | |
1476 | if (family == PF_INET6 && ip_hdr(skb)->version == 4) | |
1477 | family = PF_INET; | |
1478 | #endif /* IPv6 */ | |
1479 | ||
8cc44579 | 1480 | switch (family) { |
56628b1d PE |
1481 | case PF_INET: { |
1482 | struct iphdr *hdr4; | |
61e10682 | 1483 | struct netlbl_af4list *addr4; |
56628b1d | 1484 | |
8cc44579 | 1485 | hdr4 = ip_hdr(skb); |
61e10682 PM |
1486 | addr4 = netlbl_af4list_search(hdr4->saddr, |
1487 | &iface->addr4_list); | |
8cc44579 PM |
1488 | if (addr4 == NULL) |
1489 | goto unlabel_getattr_nolabel; | |
61e10682 | 1490 | secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
8cc44579 | 1491 | break; |
56628b1d | 1492 | } |
dfd56b8b | 1493 | #if IS_ENABLED(CONFIG_IPV6) |
56628b1d PE |
1494 | case PF_INET6: { |
1495 | struct ipv6hdr *hdr6; | |
61e10682 | 1496 | struct netlbl_af6list *addr6; |
56628b1d | 1497 | |
8cc44579 | 1498 | hdr6 = ipv6_hdr(skb); |
61e10682 PM |
1499 | addr6 = netlbl_af6list_search(&hdr6->saddr, |
1500 | &iface->addr6_list); | |
8cc44579 PM |
1501 | if (addr6 == NULL) |
1502 | goto unlabel_getattr_nolabel; | |
61e10682 | 1503 | secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid; |
8cc44579 | 1504 | break; |
56628b1d | 1505 | } |
8cc44579 PM |
1506 | #endif /* IPv6 */ |
1507 | default: | |
1508 | goto unlabel_getattr_nolabel; | |
1509 | } | |
1510 | rcu_read_unlock(); | |
1511 | ||
1512 | secattr->flags |= NETLBL_SECATTR_SECID; | |
1513 | secattr->type = NETLBL_NLTYPE_UNLABELED; | |
1514 | return 0; | |
1515 | ||
1516 | unlabel_getattr_nolabel: | |
1517 | rcu_read_unlock(); | |
c783f1ce PM |
1518 | if (netlabel_unlabel_acceptflg == 0) |
1519 | return -ENOMSG; | |
16efd454 | 1520 | secattr->type = NETLBL_NLTYPE_UNLABELED; |
c783f1ce | 1521 | return 0; |
96cb8e33 PM |
1522 | } |
1523 | ||
1524 | /** | |
1525 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets | |
1526 | * | |
1527 | * Description: | |
1528 | * Set the default NetLabel configuration to allow incoming unlabeled packets | |
1529 | * and to send unlabeled network traffic by default. | |
1530 | * | |
1531 | */ | |
05705e4e | 1532 | int __init netlbl_unlabel_defconf(void) |
96cb8e33 PM |
1533 | { |
1534 | int ret_val; | |
1535 | struct netlbl_dom_map *entry; | |
95d4e6be | 1536 | struct netlbl_audit audit_info; |
32f50cde | 1537 | |
95d4e6be PM |
1538 | /* Only the kernel is allowed to call this function and the only time |
1539 | * it is called is at bootup before the audit subsystem is reporting | |
1540 | * messages so don't worry to much about these values. */ | |
6326948f | 1541 | security_current_getsecid_subj(&audit_info.secid); |
e1760bd5 | 1542 | audit_info.loginuid = GLOBAL_ROOT_UID; |
2532386f | 1543 | audit_info.sessionid = 0; |
96cb8e33 PM |
1544 | |
1545 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
1546 | if (entry == NULL) | |
1547 | return -ENOMEM; | |
8f18e675 | 1548 | entry->family = AF_UNSPEC; |
6a8b7f0c | 1549 | entry->def.type = NETLBL_NLTYPE_UNLABELED; |
95d4e6be | 1550 | ret_val = netlbl_domhsh_add_default(entry, &audit_info); |
96cb8e33 PM |
1551 | if (ret_val != 0) |
1552 | return ret_val; | |
1553 | ||
95d4e6be | 1554 | netlbl_unlabel_acceptflg_set(1, &audit_info); |
96cb8e33 PM |
1555 | |
1556 | return 0; | |
1557 | } |