blob: b0380927f05f973a59228860e6cfae86187ab639 [file] [log] [blame]
Paul Moore96cb8e32006-08-03 16:48:59 -07001/*
2 * NetLabel Unlabeled Support
3 *
4 * This file defines functions for dealing with unlabeled packets for the
5 * NetLabel system. The NetLabel system manages static and dynamic label
6 * mappings for network protocols such as CIPSO and RIPSO.
7 *
Paul Moore82c21bf2011-08-01 11:10:33 +00008 * Author: Paul Moore <paul@paul-moore.com>
Paul Moore96cb8e32006-08-03 16:48:59 -07009 *
10 */
11
12/*
Paul Moore61e10682008-10-10 10:16:32 -040013 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008
Paul Moore96cb8e32006-08-03 16:48:59 -070014 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
23 * the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
Jeff Kirsherd484ff12013-12-06 09:13:41 -080026 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Paul Moore96cb8e32006-08-03 16:48:59 -070027 *
28 */
29
30#include <linux/types.h>
Paul Moore8cc44572008-01-29 08:44:21 -050031#include <linux/rcupdate.h>
Paul Moore96cb8e32006-08-03 16:48:59 -070032#include <linux/list.h>
33#include <linux/spinlock.h>
34#include <linux/socket.h>
35#include <linux/string.h>
36#include <linux/skbuff.h>
Paul Moorede646882006-11-17 17:38:55 -050037#include <linux/audit.h>
Paul Moore8cc44572008-01-29 08:44:21 -050038#include <linux/in.h>
39#include <linux/in6.h>
40#include <linux/ip.h>
41#include <linux/ipv6.h>
42#include <linux/notifier.h>
43#include <linux/netdevice.h>
44#include <linux/security.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090045#include <linux/slab.h>
Paul Moore96cb8e32006-08-03 16:48:59 -070046#include <net/sock.h>
47#include <net/netlink.h>
48#include <net/genetlink.h>
Paul Moore8cc44572008-01-29 08:44:21 -050049#include <net/ip.h>
50#include <net/ipv6.h>
51#include <net/net_namespace.h>
Paul Moore96cb8e32006-08-03 16:48:59 -070052#include <net/netlabel.h>
53#include <asm/bug.h>
Arun Sharma600634972011-07-26 16:09:06 -070054#include <linux/atomic.h>
Paul Moore96cb8e32006-08-03 16:48:59 -070055
56#include "netlabel_user.h"
Paul Moore61e10682008-10-10 10:16:32 -040057#include "netlabel_addrlist.h"
Paul Moore96cb8e32006-08-03 16:48:59 -070058#include "netlabel_domainhash.h"
59#include "netlabel_unlabeled.h"
Paul Moore8cc44572008-01-29 08:44:21 -050060#include "netlabel_mgmt.h"
61
62/* NOTE: at present we always use init's network namespace since we don't
63 * presently support different namespaces even though the majority of
64 * the functions in this file are "namespace safe" */
65
66/* The unlabeled connection hash table which we use to map network interfaces
67 * and addresses of unlabeled packets to a user specified secid value for the
68 * LSM. The hash table is used to lookup the network interface entry
69 * (struct netlbl_unlhsh_iface) and then the interface entry is used to
70 * lookup an IP address match from an ordered list. If a network interface
71 * match can not be found in the hash table then the default entry
72 * (netlbl_unlhsh_def) is used. The IP address entry list
73 * (struct netlbl_unlhsh_addr) is ordered such that the entries with a
74 * larger netmask come first.
75 */
76struct netlbl_unlhsh_tbl {
77 struct list_head *tbl;
78 u32 size;
79};
Paul Moore61e10682008-10-10 10:16:32 -040080#define netlbl_unlhsh_addr4_entry(iter) \
81 container_of(iter, struct netlbl_unlhsh_addr4, list)
Paul Moore8cc44572008-01-29 08:44:21 -050082struct netlbl_unlhsh_addr4 {
Paul Moore8cc44572008-01-29 08:44:21 -050083 u32 secid;
84
Paul Moore61e10682008-10-10 10:16:32 -040085 struct netlbl_af4list list;
Paul Moore8cc44572008-01-29 08:44:21 -050086 struct rcu_head rcu;
87};
Paul Moore61e10682008-10-10 10:16:32 -040088#define netlbl_unlhsh_addr6_entry(iter) \
89 container_of(iter, struct netlbl_unlhsh_addr6, list)
Paul Moore8cc44572008-01-29 08:44:21 -050090struct netlbl_unlhsh_addr6 {
Paul Moore8cc44572008-01-29 08:44:21 -050091 u32 secid;
92
Paul Moore61e10682008-10-10 10:16:32 -040093 struct netlbl_af6list list;
Paul Moore8cc44572008-01-29 08:44:21 -050094 struct rcu_head rcu;
95};
96struct netlbl_unlhsh_iface {
97 int ifindex;
98 struct list_head addr4_list;
99 struct list_head addr6_list;
100
101 u32 valid;
102 struct list_head list;
103 struct rcu_head rcu;
104};
105
106/* Argument struct for netlbl_unlhsh_walk() */
107struct netlbl_unlhsh_walk_arg {
108 struct netlink_callback *nl_cb;
109 struct sk_buff *skb;
110 u32 seq;
111};
112
113/* Unlabeled connection hash table */
114/* updates should be so rare that having one spinlock for the entire
115 * hash table should be okay */
116static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
Paul Mooreb914f3a2010-04-01 10:43:57 +0000117#define netlbl_unlhsh_rcu_deref(p) \
Michal Hockod8bf4ca2011-07-08 14:39:41 +0200118 rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock))
Paul Moore8cc44572008-01-29 08:44:21 -0500119static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
120static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
Paul Moore96cb8e32006-08-03 16:48:59 -0700121
122/* Accept unlabeled packets flag */
Paul Moorecd287862006-11-17 17:38:44 -0500123static u8 netlabel_unlabel_acceptflg = 0;
Paul Moore96cb8e32006-08-03 16:48:59 -0700124
Paul Moore8cc44572008-01-29 08:44:21 -0500125/* NetLabel Generic NETLINK unlabeled family */
Paul Moore96cb8e32006-08-03 16:48:59 -0700126static struct genl_family netlbl_unlabel_gnl_family = {
127 .id = GENL_ID_GENERATE,
128 .hdrsize = 0,
129 .name = NETLBL_NLTYPE_UNLABELED_NAME,
130 .version = NETLBL_PROTO_VERSION,
Paul Moorefd385852006-09-25 15:56:37 -0700131 .maxattr = NLBL_UNLABEL_A_MAX,
Paul Moore96cb8e32006-08-03 16:48:59 -0700132};
133
Paul Moorefd385852006-09-25 15:56:37 -0700134/* NetLabel Netlink attribute policy */
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700135static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
Paul Moorefd385852006-09-25 15:56:37 -0700136 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
Paul Moore8cc44572008-01-29 08:44:21 -0500137 [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
138 .len = sizeof(struct in6_addr) },
139 [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
140 .len = sizeof(struct in6_addr) },
141 [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
142 .len = sizeof(struct in_addr) },
143 [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
144 .len = sizeof(struct in_addr) },
145 [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
146 .len = IFNAMSIZ - 1 },
147 [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
Paul Moorefd385852006-09-25 15:56:37 -0700148};
Paul Moore96cb8e32006-08-03 16:48:59 -0700149
150/*
Paul Moore8cc44572008-01-29 08:44:21 -0500151 * Unlabeled Connection Hash Table Functions
Paul Moore32f50cd2006-09-28 14:51:47 -0700152 */
153
Paul Moore8cc44572008-01-29 08:44:21 -0500154/**
155 * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
156 * @entry: the entry's RCU field
157 *
158 * Description:
159 * This function is designed to be used as a callback to the call_rcu()
160 * function so that memory allocated to a hash table interface entry can be
161 * released safely. It is important to note that this function does not free
162 * the IPv4 and IPv6 address lists contained as part of an interface entry. It
163 * is up to the rest of the code to make sure an interface entry is only freed
164 * once it's address lists are empty.
165 *
166 */
167static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
168{
169 struct netlbl_unlhsh_iface *iface;
Paul Moore61e10682008-10-10 10:16:32 -0400170 struct netlbl_af4list *iter4;
171 struct netlbl_af4list *tmp4;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000172#if IS_ENABLED(CONFIG_IPV6)
Paul Moore61e10682008-10-10 10:16:32 -0400173 struct netlbl_af6list *iter6;
174 struct netlbl_af6list *tmp6;
175#endif /* IPv6 */
Paul Moore8cc44572008-01-29 08:44:21 -0500176
177 iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
178
179 /* no need for locks here since we are the only one with access to this
180 * structure */
181
Paul Moore61e10682008-10-10 10:16:32 -0400182 netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
183 netlbl_af4list_remove_entry(iter4);
184 kfree(netlbl_unlhsh_addr4_entry(iter4));
185 }
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000186#if IS_ENABLED(CONFIG_IPV6)
Paul Moore61e10682008-10-10 10:16:32 -0400187 netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
188 netlbl_af6list_remove_entry(iter6);
189 kfree(netlbl_unlhsh_addr6_entry(iter6));
190 }
191#endif /* IPv6 */
Paul Moore8cc44572008-01-29 08:44:21 -0500192 kfree(iface);
193}
194
195/**
196 * netlbl_unlhsh_hash - Hashing function for the hash table
197 * @ifindex: the network interface/device to hash
198 *
199 * Description:
200 * This is the hashing function for the unlabeled hash table, it returns the
201 * bucket number for the given device/interface. The caller is responsible for
Paul Mooreb914f3a2010-04-01 10:43:57 +0000202 * ensuring that the hash table is protected with either a RCU read lock or
203 * the hash table lock.
Paul Moore8cc44572008-01-29 08:44:21 -0500204 *
205 */
206static u32 netlbl_unlhsh_hash(int ifindex)
207{
Paul Mooreb914f3a2010-04-01 10:43:57 +0000208 return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
Paul Moore8cc44572008-01-29 08:44:21 -0500209}
210
211/**
Paul Moore8cc44572008-01-29 08:44:21 -0500212 * netlbl_unlhsh_search_iface - Search for a matching interface entry
213 * @ifindex: the network interface
214 *
215 * Description:
216 * Searches the unlabeled connection hash table and returns a pointer to the
217 * interface entry which matches @ifindex, otherwise NULL is returned. The
Paul Mooreb914f3a2010-04-01 10:43:57 +0000218 * caller is responsible for ensuring that the hash table is protected with
219 * either a RCU read lock or the hash table lock.
Paul Moore8cc44572008-01-29 08:44:21 -0500220 *
221 */
222static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
223{
224 u32 bkt;
Paul Moore56196702008-10-10 10:16:29 -0400225 struct list_head *bkt_list;
Paul Moore8cc44572008-01-29 08:44:21 -0500226 struct netlbl_unlhsh_iface *iter;
227
228 bkt = netlbl_unlhsh_hash(ifindex);
Paul Mooreb914f3a2010-04-01 10:43:57 +0000229 bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
Paul Moore56196702008-10-10 10:16:29 -0400230 list_for_each_entry_rcu(iter, bkt_list, list)
Paul Moore8cc44572008-01-29 08:44:21 -0500231 if (iter->valid && iter->ifindex == ifindex)
232 return iter;
233
234 return NULL;
235}
236
237/**
Paul Moore8cc44572008-01-29 08:44:21 -0500238 * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
239 * @iface: the associated interface entry
240 * @addr: IPv4 address in network byte order
241 * @mask: IPv4 address mask in network byte order
242 * @secid: LSM secid value for entry
243 *
244 * Description:
245 * Add a new address entry into the unlabeled connection hash table using the
246 * interface entry specified by @iface. On success zero is returned, otherwise
Paul Mooreb914f3a2010-04-01 10:43:57 +0000247 * a negative value is returned.
Paul Moore8cc44572008-01-29 08:44:21 -0500248 *
249 */
250static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
251 const struct in_addr *addr,
252 const struct in_addr *mask,
253 u32 secid)
254{
Paul Moore61e10682008-10-10 10:16:32 -0400255 int ret_val;
Paul Moore8cc44572008-01-29 08:44:21 -0500256 struct netlbl_unlhsh_addr4 *entry;
Paul Moore8cc44572008-01-29 08:44:21 -0500257
258 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
259 if (entry == NULL)
260 return -ENOMEM;
261
Paul Moore61e10682008-10-10 10:16:32 -0400262 entry->list.addr = addr->s_addr & mask->s_addr;
263 entry->list.mask = mask->s_addr;
264 entry->list.valid = 1;
Paul Moore61e10682008-10-10 10:16:32 -0400265 entry->secid = secid;
Paul Moore8cc44572008-01-29 08:44:21 -0500266
267 spin_lock(&netlbl_unlhsh_lock);
Paul Moore61e10682008-10-10 10:16:32 -0400268 ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
Paul Moore8cc44572008-01-29 08:44:21 -0500269 spin_unlock(&netlbl_unlhsh_lock);
Paul Moore61e10682008-10-10 10:16:32 -0400270
271 if (ret_val != 0)
272 kfree(entry);
273 return ret_val;
Paul Moore8cc44572008-01-29 08:44:21 -0500274}
275
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000276#if IS_ENABLED(CONFIG_IPV6)
Paul Moore8cc44572008-01-29 08:44:21 -0500277/**
278 * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
279 * @iface: the associated interface entry
280 * @addr: IPv6 address in network byte order
281 * @mask: IPv6 address mask in network byte order
282 * @secid: LSM secid value for entry
283 *
284 * Description:
285 * Add a new address entry into the unlabeled connection hash table using the
286 * interface entry specified by @iface. On success zero is returned, otherwise
Paul Mooreb914f3a2010-04-01 10:43:57 +0000287 * a negative value is returned.
Paul Moore8cc44572008-01-29 08:44:21 -0500288 *
289 */
290static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
291 const struct in6_addr *addr,
292 const struct in6_addr *mask,
293 u32 secid)
294{
Paul Moore61e10682008-10-10 10:16:32 -0400295 int ret_val;
Paul Moore8cc44572008-01-29 08:44:21 -0500296 struct netlbl_unlhsh_addr6 *entry;
Paul Moore8cc44572008-01-29 08:44:21 -0500297
298 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
299 if (entry == NULL)
300 return -ENOMEM;
301
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000302 entry->list.addr = *addr;
Paul Moore61e10682008-10-10 10:16:32 -0400303 entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
304 entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
305 entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
306 entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000307 entry->list.mask = *mask;
Paul Moore61e10682008-10-10 10:16:32 -0400308 entry->list.valid = 1;
Paul Moore61e10682008-10-10 10:16:32 -0400309 entry->secid = secid;
Paul Moore8cc44572008-01-29 08:44:21 -0500310
311 spin_lock(&netlbl_unlhsh_lock);
Paul Moore61e10682008-10-10 10:16:32 -0400312 ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
Paul Moore8cc44572008-01-29 08:44:21 -0500313 spin_unlock(&netlbl_unlhsh_lock);
Paul Moore61e10682008-10-10 10:16:32 -0400314
315 if (ret_val != 0)
316 kfree(entry);
Paul Moore8cc44572008-01-29 08:44:21 -0500317 return 0;
318}
319#endif /* IPv6 */
320
321/**
322 * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
323 * @ifindex: network interface
324 *
325 * Description:
326 * Add a new, empty, interface entry into the unlabeled connection hash table.
327 * On success a pointer to the new interface entry is returned, on failure NULL
Paul Mooreb914f3a2010-04-01 10:43:57 +0000328 * is returned.
Paul Moore8cc44572008-01-29 08:44:21 -0500329 *
330 */
331static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
332{
333 u32 bkt;
334 struct netlbl_unlhsh_iface *iface;
335
336 iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
337 if (iface == NULL)
338 return NULL;
339
340 iface->ifindex = ifindex;
341 INIT_LIST_HEAD(&iface->addr4_list);
342 INIT_LIST_HEAD(&iface->addr6_list);
343 iface->valid = 1;
Paul Moore8cc44572008-01-29 08:44:21 -0500344
345 spin_lock(&netlbl_unlhsh_lock);
346 if (ifindex > 0) {
347 bkt = netlbl_unlhsh_hash(ifindex);
348 if (netlbl_unlhsh_search_iface(ifindex) != NULL)
349 goto add_iface_failure;
350 list_add_tail_rcu(&iface->list,
Paul Mooreb914f3a2010-04-01 10:43:57 +0000351 &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
Paul Moore8cc44572008-01-29 08:44:21 -0500352 } else {
353 INIT_LIST_HEAD(&iface->list);
Paul Mooreb914f3a2010-04-01 10:43:57 +0000354 if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
Paul Moore8cc44572008-01-29 08:44:21 -0500355 goto add_iface_failure;
Eric Dumazetcf778b02012-01-12 04:41:32 +0000356 rcu_assign_pointer(netlbl_unlhsh_def, iface);
Paul Moore8cc44572008-01-29 08:44:21 -0500357 }
358 spin_unlock(&netlbl_unlhsh_lock);
359
360 return iface;
361
362add_iface_failure:
363 spin_unlock(&netlbl_unlhsh_lock);
364 kfree(iface);
365 return NULL;
366}
367
368/**
369 * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
370 * @net: network namespace
371 * @dev_name: interface name
372 * @addr: IP address in network byte order
373 * @mask: address mask in network byte order
374 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
375 * @secid: LSM secid value for the entry
Paul Moore13541b32008-01-29 08:44:23 -0500376 * @audit_info: NetLabel audit information
Paul Moore8cc44572008-01-29 08:44:21 -0500377 *
378 * Description:
379 * Adds a new entry to the unlabeled connection hash table. Returns zero on
380 * success, negative values on failure.
381 *
382 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500383int netlbl_unlhsh_add(struct net *net,
384 const char *dev_name,
385 const void *addr,
386 const void *mask,
387 u32 addr_len,
388 u32 secid,
389 struct netlbl_audit *audit_info)
Paul Moore8cc44572008-01-29 08:44:21 -0500390{
391 int ret_val;
392 int ifindex;
393 struct net_device *dev;
394 struct netlbl_unlhsh_iface *iface;
Paul Moore13541b32008-01-29 08:44:23 -0500395 struct audit_buffer *audit_buf = NULL;
396 char *secctx = NULL;
397 u32 secctx_len;
Paul Moore8cc44572008-01-29 08:44:21 -0500398
399 if (addr_len != sizeof(struct in_addr) &&
400 addr_len != sizeof(struct in6_addr))
401 return -EINVAL;
402
403 rcu_read_lock();
404 if (dev_name != NULL) {
Eric Dumazet122ec6f2009-11-05 20:53:47 -0800405 dev = dev_get_by_name_rcu(net, dev_name);
Paul Moore8cc44572008-01-29 08:44:21 -0500406 if (dev == NULL) {
407 ret_val = -ENODEV;
408 goto unlhsh_add_return;
409 }
410 ifindex = dev->ifindex;
Paul Moore8cc44572008-01-29 08:44:21 -0500411 iface = netlbl_unlhsh_search_iface(ifindex);
412 } else {
413 ifindex = 0;
414 iface = rcu_dereference(netlbl_unlhsh_def);
415 }
416 if (iface == NULL) {
417 iface = netlbl_unlhsh_add_iface(ifindex);
418 if (iface == NULL) {
419 ret_val = -ENOMEM;
420 goto unlhsh_add_return;
421 }
422 }
Paul Moore13541b32008-01-29 08:44:23 -0500423 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
424 audit_info);
Paul Moore8cc44572008-01-29 08:44:21 -0500425 switch (addr_len) {
Pavel Emelyanov56628b12008-02-12 22:37:19 -0800426 case sizeof(struct in_addr): {
Joe Perchesea110732011-06-13 16:21:26 +0000427 const struct in_addr *addr4 = addr;
428 const struct in_addr *mask4 = mask;
Pavel Emelyanov56628b12008-02-12 22:37:19 -0800429
Paul Moore13541b32008-01-29 08:44:23 -0500430 ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
431 if (audit_buf != NULL)
Paul Moore63c41682008-10-10 10:16:32 -0400432 netlbl_af4list_audit_addr(audit_buf, 1,
433 dev_name,
434 addr4->s_addr,
435 mask4->s_addr);
Paul Moore8cc44572008-01-29 08:44:21 -0500436 break;
Pavel Emelyanov56628b12008-02-12 22:37:19 -0800437 }
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000438#if IS_ENABLED(CONFIG_IPV6)
Pavel Emelyanov56628b12008-02-12 22:37:19 -0800439 case sizeof(struct in6_addr): {
Joe Perchesea110732011-06-13 16:21:26 +0000440 const struct in6_addr *addr6 = addr;
441 const struct in6_addr *mask6 = mask;
Pavel Emelyanov56628b12008-02-12 22:37:19 -0800442
Paul Moore13541b32008-01-29 08:44:23 -0500443 ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
444 if (audit_buf != NULL)
Paul Moore63c41682008-10-10 10:16:32 -0400445 netlbl_af6list_audit_addr(audit_buf, 1,
446 dev_name,
447 addr6, mask6);
Paul Moore8cc44572008-01-29 08:44:21 -0500448 break;
Pavel Emelyanov56628b12008-02-12 22:37:19 -0800449 }
Paul Moore8cc44572008-01-29 08:44:21 -0500450#endif /* IPv6 */
451 default:
452 ret_val = -EINVAL;
453 }
454 if (ret_val == 0)
455 atomic_inc(&netlabel_mgmt_protocount);
456
457unlhsh_add_return:
458 rcu_read_unlock();
Paul Moore13541b32008-01-29 08:44:23 -0500459 if (audit_buf != NULL) {
460 if (security_secid_to_secctx(secid,
461 &secctx,
462 &secctx_len) == 0) {
463 audit_log_format(audit_buf, " sec_obj=%s", secctx);
464 security_release_secctx(secctx, secctx_len);
465 }
466 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
467 audit_log_end(audit_buf);
468 }
Paul Moore8cc44572008-01-29 08:44:21 -0500469 return ret_val;
470}
471
472/**
473 * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
Paul Moore13541b32008-01-29 08:44:23 -0500474 * @net: network namespace
Paul Moore8cc44572008-01-29 08:44:21 -0500475 * @iface: interface entry
476 * @addr: IP address
477 * @mask: IP address mask
Paul Moore13541b32008-01-29 08:44:23 -0500478 * @audit_info: NetLabel audit information
Paul Moore8cc44572008-01-29 08:44:21 -0500479 *
480 * Description:
481 * Remove an IP address entry from the unlabeled connection hash table.
Paul Mooreb914f3a2010-04-01 10:43:57 +0000482 * Returns zero on success, negative values on failure.
Paul Moore8cc44572008-01-29 08:44:21 -0500483 *
484 */
Paul Moore13541b32008-01-29 08:44:23 -0500485static int netlbl_unlhsh_remove_addr4(struct net *net,
486 struct netlbl_unlhsh_iface *iface,
Paul Moore8cc44572008-01-29 08:44:21 -0500487 const struct in_addr *addr,
Paul Moore13541b32008-01-29 08:44:23 -0500488 const struct in_addr *mask,
489 struct netlbl_audit *audit_info)
Paul Moore8cc44572008-01-29 08:44:21 -0500490{
Paul Moore61e10682008-10-10 10:16:32 -0400491 struct netlbl_af4list *list_entry;
Paul Moore8cc44572008-01-29 08:44:21 -0500492 struct netlbl_unlhsh_addr4 *entry;
Paul Moore61e10682008-10-10 10:16:32 -0400493 struct audit_buffer *audit_buf;
Paul Moore13541b32008-01-29 08:44:23 -0500494 struct net_device *dev;
Paul Moore61e10682008-10-10 10:16:32 -0400495 char *secctx;
Paul Moore13541b32008-01-29 08:44:23 -0500496 u32 secctx_len;
Paul Moore8cc44572008-01-29 08:44:21 -0500497
498 spin_lock(&netlbl_unlhsh_lock);
Paul Moore61e10682008-10-10 10:16:32 -0400499 list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
500 &iface->addr4_list);
Paul Moore8cc44572008-01-29 08:44:21 -0500501 spin_unlock(&netlbl_unlhsh_lock);
Paul Moored25830e2008-12-03 00:37:04 -0800502 if (list_entry != NULL)
503 entry = netlbl_unlhsh_addr4_entry(list_entry);
504 else
Paul Mooreec8f2372008-12-11 21:31:50 -0800505 entry = NULL;
Paul Moore8cc44572008-01-29 08:44:21 -0500506
Paul Moore13541b32008-01-29 08:44:23 -0500507 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
508 audit_info);
509 if (audit_buf != NULL) {
510 dev = dev_get_by_index(net, iface->ifindex);
Paul Moore63c41682008-10-10 10:16:32 -0400511 netlbl_af4list_audit_addr(audit_buf, 1,
512 (dev != NULL ? dev->name : NULL),
513 addr->s_addr, mask->s_addr);
Paul Moore13541b32008-01-29 08:44:23 -0500514 if (dev != NULL)
515 dev_put(dev);
Paul Mooreec8f2372008-12-11 21:31:50 -0800516 if (entry != NULL &&
517 security_secid_to_secctx(entry->secid,
518 &secctx, &secctx_len) == 0) {
Paul Moore13541b32008-01-29 08:44:23 -0500519 audit_log_format(audit_buf, " sec_obj=%s", secctx);
520 security_release_secctx(secctx, secctx_len);
521 }
Paul Mooreec8f2372008-12-11 21:31:50 -0800522 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
Paul Moore13541b32008-01-29 08:44:23 -0500523 audit_log_end(audit_buf);
524 }
525
Paul Mooreec8f2372008-12-11 21:31:50 -0800526 if (entry == NULL)
527 return -ENOENT;
528
Lai Jiangshanc3b49422011-03-18 12:03:56 +0800529 kfree_rcu(entry, rcu);
Paul Mooreec8f2372008-12-11 21:31:50 -0800530 return 0;
Paul Moore8cc44572008-01-29 08:44:21 -0500531}
532
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000533#if IS_ENABLED(CONFIG_IPV6)
Paul Moore8cc44572008-01-29 08:44:21 -0500534/**
535 * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
Paul Moore13541b32008-01-29 08:44:23 -0500536 * @net: network namespace
Paul Moore8cc44572008-01-29 08:44:21 -0500537 * @iface: interface entry
538 * @addr: IP address
539 * @mask: IP address mask
Paul Moore13541b32008-01-29 08:44:23 -0500540 * @audit_info: NetLabel audit information
Paul Moore8cc44572008-01-29 08:44:21 -0500541 *
542 * Description:
543 * Remove an IP address entry from the unlabeled connection hash table.
Paul Mooreb914f3a2010-04-01 10:43:57 +0000544 * Returns zero on success, negative values on failure.
Paul Moore8cc44572008-01-29 08:44:21 -0500545 *
546 */
Paul Moore13541b32008-01-29 08:44:23 -0500547static int netlbl_unlhsh_remove_addr6(struct net *net,
548 struct netlbl_unlhsh_iface *iface,
Paul Moore8cc44572008-01-29 08:44:21 -0500549 const struct in6_addr *addr,
Paul Moore13541b32008-01-29 08:44:23 -0500550 const struct in6_addr *mask,
551 struct netlbl_audit *audit_info)
Paul Moore8cc44572008-01-29 08:44:21 -0500552{
Paul Moore61e10682008-10-10 10:16:32 -0400553 struct netlbl_af6list *list_entry;
Paul Moore8cc44572008-01-29 08:44:21 -0500554 struct netlbl_unlhsh_addr6 *entry;
Paul Moore61e10682008-10-10 10:16:32 -0400555 struct audit_buffer *audit_buf;
Paul Moore13541b32008-01-29 08:44:23 -0500556 struct net_device *dev;
Paul Moore61e10682008-10-10 10:16:32 -0400557 char *secctx;
Paul Moore13541b32008-01-29 08:44:23 -0500558 u32 secctx_len;
Paul Moore8cc44572008-01-29 08:44:21 -0500559
560 spin_lock(&netlbl_unlhsh_lock);
Paul Moore61e10682008-10-10 10:16:32 -0400561 list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
Paul Moore8cc44572008-01-29 08:44:21 -0500562 spin_unlock(&netlbl_unlhsh_lock);
Paul Moored25830e2008-12-03 00:37:04 -0800563 if (list_entry != NULL)
564 entry = netlbl_unlhsh_addr6_entry(list_entry);
565 else
Paul Mooreec8f2372008-12-11 21:31:50 -0800566 entry = NULL;
Paul Moore8cc44572008-01-29 08:44:21 -0500567
Paul Moore13541b32008-01-29 08:44:23 -0500568 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
569 audit_info);
570 if (audit_buf != NULL) {
571 dev = dev_get_by_index(net, iface->ifindex);
Paul Moore63c41682008-10-10 10:16:32 -0400572 netlbl_af6list_audit_addr(audit_buf, 1,
573 (dev != NULL ? dev->name : NULL),
574 addr, mask);
Paul Moore13541b32008-01-29 08:44:23 -0500575 if (dev != NULL)
576 dev_put(dev);
Paul Mooreec8f2372008-12-11 21:31:50 -0800577 if (entry != NULL &&
578 security_secid_to_secctx(entry->secid,
579 &secctx, &secctx_len) == 0) {
Paul Moore13541b32008-01-29 08:44:23 -0500580 audit_log_format(audit_buf, " sec_obj=%s", secctx);
581 security_release_secctx(secctx, secctx_len);
582 }
Paul Mooreec8f2372008-12-11 21:31:50 -0800583 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
Paul Moore13541b32008-01-29 08:44:23 -0500584 audit_log_end(audit_buf);
585 }
586
Paul Mooreec8f2372008-12-11 21:31:50 -0800587 if (entry == NULL)
588 return -ENOENT;
589
Lai Jiangshan6b262232011-03-18 12:04:50 +0800590 kfree_rcu(entry, rcu);
Paul Mooreec8f2372008-12-11 21:31:50 -0800591 return 0;
Paul Moore8cc44572008-01-29 08:44:21 -0500592}
593#endif /* IPv6 */
594
595/**
596 * netlbl_unlhsh_condremove_iface - Remove an interface entry
597 * @iface: the interface entry
598 *
599 * Description:
600 * Remove an interface entry from the unlabeled connection hash table if it is
601 * empty. An interface entry is considered to be empty if there are no
602 * address entries assigned to it.
603 *
604 */
605static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
606{
Paul Moore61e10682008-10-10 10:16:32 -0400607 struct netlbl_af4list *iter4;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000608#if IS_ENABLED(CONFIG_IPV6)
Paul Moore61e10682008-10-10 10:16:32 -0400609 struct netlbl_af6list *iter6;
610#endif /* IPv6 */
Paul Moore8cc44572008-01-29 08:44:21 -0500611
612 spin_lock(&netlbl_unlhsh_lock);
Paul Moore61e10682008-10-10 10:16:32 -0400613 netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
614 goto unlhsh_condremove_failure;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000615#if IS_ENABLED(CONFIG_IPV6)
Paul Moore61e10682008-10-10 10:16:32 -0400616 netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
617 goto unlhsh_condremove_failure;
618#endif /* IPv6 */
Paul Moore8cc44572008-01-29 08:44:21 -0500619 iface->valid = 0;
620 if (iface->ifindex > 0)
621 list_del_rcu(&iface->list);
622 else
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000623 RCU_INIT_POINTER(netlbl_unlhsh_def, NULL);
Paul Moore8cc44572008-01-29 08:44:21 -0500624 spin_unlock(&netlbl_unlhsh_lock);
625
626 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
627 return;
628
629unlhsh_condremove_failure:
630 spin_unlock(&netlbl_unlhsh_lock);
Paul Moore8cc44572008-01-29 08:44:21 -0500631}
632
633/**
634 * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
635 * @net: network namespace
636 * @dev_name: interface name
637 * @addr: IP address in network byte order
638 * @mask: address mask in network byte order
639 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
Paul Moore13541b32008-01-29 08:44:23 -0500640 * @audit_info: NetLabel audit information
Paul Moore8cc44572008-01-29 08:44:21 -0500641 *
642 * Description:
643 * Removes and existing entry from the unlabeled connection hash table.
644 * Returns zero on success, negative values on failure.
645 *
646 */
Paul Moore6c2e8ac2008-12-31 12:54:11 -0500647int netlbl_unlhsh_remove(struct net *net,
648 const char *dev_name,
649 const void *addr,
650 const void *mask,
651 u32 addr_len,
652 struct netlbl_audit *audit_info)
Paul Moore8cc44572008-01-29 08:44:21 -0500653{
654 int ret_val;
655 struct net_device *dev;
656 struct netlbl_unlhsh_iface *iface;
657
658 if (addr_len != sizeof(struct in_addr) &&
659 addr_len != sizeof(struct in6_addr))
660 return -EINVAL;
661
662 rcu_read_lock();
663 if (dev_name != NULL) {
Eric Dumazet122ec6f2009-11-05 20:53:47 -0800664 dev = dev_get_by_name_rcu(net, dev_name);
Paul Moore8cc44572008-01-29 08:44:21 -0500665 if (dev == NULL) {
666 ret_val = -ENODEV;
667 goto unlhsh_remove_return;
668 }
669 iface = netlbl_unlhsh_search_iface(dev->ifindex);
Paul Moore8cc44572008-01-29 08:44:21 -0500670 } else
671 iface = rcu_dereference(netlbl_unlhsh_def);
672 if (iface == NULL) {
673 ret_val = -ENOENT;
674 goto unlhsh_remove_return;
675 }
676 switch (addr_len) {
677 case sizeof(struct in_addr):
Paul Moore13541b32008-01-29 08:44:23 -0500678 ret_val = netlbl_unlhsh_remove_addr4(net,
679 iface, addr, mask,
680 audit_info);
Paul Moore8cc44572008-01-29 08:44:21 -0500681 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000682#if IS_ENABLED(CONFIG_IPV6)
Paul Moore8cc44572008-01-29 08:44:21 -0500683 case sizeof(struct in6_addr):
Paul Moore13541b32008-01-29 08:44:23 -0500684 ret_val = netlbl_unlhsh_remove_addr6(net,
685 iface, addr, mask,
686 audit_info);
Paul Moore8cc44572008-01-29 08:44:21 -0500687 break;
688#endif /* IPv6 */
689 default:
690 ret_val = -EINVAL;
691 }
692 if (ret_val == 0) {
693 netlbl_unlhsh_condremove_iface(iface);
694 atomic_dec(&netlabel_mgmt_protocount);
695 }
696
697unlhsh_remove_return:
698 rcu_read_unlock();
699 return ret_val;
700}
701
702/*
703 * General Helper Functions
704 */
705
706/**
707 * netlbl_unlhsh_netdev_handler - Network device notification handler
708 * @this: notifier block
709 * @event: the event
Jiri Pirko351638e2013-05-28 01:30:21 +0000710 * @ptr: the netdevice notifier info (cast to void)
Paul Moore8cc44572008-01-29 08:44:21 -0500711 *
712 * Description:
713 * Handle network device events, although at present all we care about is a
714 * network device going away. In the case of a device going away we clear any
715 * related entries from the unlabeled connection hash table.
716 *
717 */
718static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
Jiri Pirko351638e2013-05-28 01:30:21 +0000719 unsigned long event, void *ptr)
Paul Moore8cc44572008-01-29 08:44:21 -0500720{
Jiri Pirko351638e2013-05-28 01:30:21 +0000721 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Paul Moore8cc44572008-01-29 08:44:21 -0500722 struct netlbl_unlhsh_iface *iface = NULL;
723
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700724 if (!net_eq(dev_net(dev), &init_net))
Paul Moore8cc44572008-01-29 08:44:21 -0500725 return NOTIFY_DONE;
726
727 /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
728 if (event == NETDEV_DOWN) {
729 spin_lock(&netlbl_unlhsh_lock);
730 iface = netlbl_unlhsh_search_iface(dev->ifindex);
731 if (iface != NULL && iface->valid) {
732 iface->valid = 0;
733 list_del_rcu(&iface->list);
734 } else
735 iface = NULL;
736 spin_unlock(&netlbl_unlhsh_lock);
737 }
738
739 if (iface != NULL)
740 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
741
742 return NOTIFY_DONE;
743}
744
745/**
Paul Moore32f50cd2006-09-28 14:51:47 -0700746 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
747 * @value: desired value
Paul Moore95d4e6b2006-09-29 17:05:05 -0700748 * @audit_info: NetLabel audit information
Paul Moore32f50cd2006-09-28 14:51:47 -0700749 *
750 * Description:
751 * Set the value of the unlabeled accept flag to @value.
752 *
753 */
Paul Moore95d4e6b2006-09-29 17:05:05 -0700754static void netlbl_unlabel_acceptflg_set(u8 value,
755 struct netlbl_audit *audit_info)
Paul Moore32f50cd2006-09-28 14:51:47 -0700756{
Paul Moore95d4e6b2006-09-29 17:05:05 -0700757 struct audit_buffer *audit_buf;
758 u8 old_val;
759
Paul Moore4be27002007-10-26 04:29:08 -0700760 old_val = netlabel_unlabel_acceptflg;
Paul Moorecd287862006-11-17 17:38:44 -0500761 netlabel_unlabel_acceptflg = value;
Paul Moore95d4e6b2006-09-29 17:05:05 -0700762 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
763 audit_info);
Paul Moorede646882006-11-17 17:38:55 -0500764 if (audit_buf != NULL) {
765 audit_log_format(audit_buf,
766 " unlbl_accept=%u old=%u", value, old_val);
767 audit_log_end(audit_buf);
768 }
Paul Moore32f50cd2006-09-28 14:51:47 -0700769}
770
Paul Moore8cc44572008-01-29 08:44:21 -0500771/**
772 * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
773 * @info: the Generic NETLINK info block
774 * @addr: the IP address
775 * @mask: the IP address mask
776 * @len: the address length
777 *
778 * Description:
779 * Examine the Generic NETLINK message and extract the IP address information.
780 * Returns zero on success, negative values on failure.
781 *
782 */
783static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
784 void **addr,
785 void **mask,
786 u32 *len)
787{
788 u32 addr_len;
789
790 if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
791 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
792 if (addr_len != sizeof(struct in_addr) &&
793 addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
794 return -EINVAL;
795 *len = addr_len;
796 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
797 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
798 return 0;
799 } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
800 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
801 if (addr_len != sizeof(struct in6_addr) &&
802 addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
803 return -EINVAL;
804 *len = addr_len;
805 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
806 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
807 return 0;
808 }
809
810 return -EINVAL;
811}
812
Paul Moore32f50cd2006-09-28 14:51:47 -0700813/*
Paul Moore96cb8e32006-08-03 16:48:59 -0700814 * NetLabel Command Handlers
815 */
816
817/**
818 * netlbl_unlabel_accept - Handle an ACCEPT message
819 * @skb: the NETLINK buffer
820 * @info: the Generic NETLINK info block
821 *
822 * Description:
823 * Process a user generated ACCEPT message and set the accept flag accordingly.
824 * Returns zero on success, negative values on failure.
825 *
826 */
827static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
828{
Paul Moorefd385852006-09-25 15:56:37 -0700829 u8 value;
Paul Moore95d4e6b2006-09-29 17:05:05 -0700830 struct netlbl_audit audit_info;
Paul Moore96cb8e32006-08-03 16:48:59 -0700831
Paul Moorefd385852006-09-25 15:56:37 -0700832 if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
833 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
Paul Moore96cb8e32006-08-03 16:48:59 -0700834 if (value == 1 || value == 0) {
Paul Moore95d4e6b2006-09-29 17:05:05 -0700835 netlbl_netlink_auditinfo(skb, &audit_info);
836 netlbl_unlabel_acceptflg_set(value, &audit_info);
Paul Moore32f50cd2006-09-28 14:51:47 -0700837 return 0;
Paul Moore96cb8e32006-08-03 16:48:59 -0700838 }
839 }
840
Paul Moore32f50cd2006-09-28 14:51:47 -0700841 return -EINVAL;
Paul Moore96cb8e32006-08-03 16:48:59 -0700842}
843
844/**
845 * netlbl_unlabel_list - Handle a LIST message
846 * @skb: the NETLINK buffer
847 * @info: the Generic NETLINK info block
848 *
849 * Description:
850 * Process a user generated LIST message and respond with the current status.
851 * Returns zero on success, negative values on failure.
852 *
853 */
854static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
855{
Paul Moorefd385852006-09-25 15:56:37 -0700856 int ret_val = -EINVAL;
Paul Moore96cb8e32006-08-03 16:48:59 -0700857 struct sk_buff *ans_skb;
Paul Moorefd385852006-09-25 15:56:37 -0700858 void *data;
Paul Moore96cb8e32006-08-03 16:48:59 -0700859
Thomas Graf339bf982006-11-10 14:10:15 -0800860 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
Paul Moore96cb8e32006-08-03 16:48:59 -0700861 if (ans_skb == NULL)
862 goto list_failure;
Thomas Graf17c157c2006-11-14 19:46:02 -0800863 data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
864 0, NLBL_UNLABEL_C_LIST);
Paul Moorefd385852006-09-25 15:56:37 -0700865 if (data == NULL) {
866 ret_val = -ENOMEM;
Paul Moore96cb8e32006-08-03 16:48:59 -0700867 goto list_failure;
Paul Moorefd385852006-09-25 15:56:37 -0700868 }
Paul Moore96cb8e32006-08-03 16:48:59 -0700869
Paul Moorefd385852006-09-25 15:56:37 -0700870 ret_val = nla_put_u8(ans_skb,
871 NLBL_UNLABEL_A_ACPTFLG,
Paul Moorecd287862006-11-17 17:38:44 -0500872 netlabel_unlabel_acceptflg);
Paul Moore96cb8e32006-08-03 16:48:59 -0700873 if (ret_val != 0)
874 goto list_failure;
875
Paul Moorefd385852006-09-25 15:56:37 -0700876 genlmsg_end(ans_skb, data);
Denis V. Lunevfe785be2008-07-10 16:53:39 -0700877 return genlmsg_reply(ans_skb, info);
Paul Moore96cb8e32006-08-03 16:48:59 -0700878
879list_failure:
Patrick McHardyb08d5842007-02-27 09:57:37 -0800880 kfree_skb(ans_skb);
Paul Moore96cb8e32006-08-03 16:48:59 -0700881 return ret_val;
882}
883
Paul Moore8cc44572008-01-29 08:44:21 -0500884/**
885 * netlbl_unlabel_staticadd - Handle a STATICADD message
886 * @skb: the NETLINK buffer
887 * @info: the Generic NETLINK info block
888 *
889 * Description:
890 * Process a user generated STATICADD message and add a new unlabeled
891 * connection entry to the hash table. Returns zero on success, negative
892 * values on failure.
893 *
894 */
895static int netlbl_unlabel_staticadd(struct sk_buff *skb,
896 struct genl_info *info)
897{
898 int ret_val;
899 char *dev_name;
900 void *addr;
901 void *mask;
902 u32 addr_len;
903 u32 secid;
Paul Moore13541b32008-01-29 08:44:23 -0500904 struct netlbl_audit audit_info;
Paul Moore8cc44572008-01-29 08:44:21 -0500905
906 /* Don't allow users to add both IPv4 and IPv6 addresses for a
907 * single entry. However, allow users to create two entries, one each
908 * for IPv4 and IPv4, with the same LSM security context which should
909 * achieve the same result. */
910 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
911 !info->attrs[NLBL_UNLABEL_A_IFACE] ||
912 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
913 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
914 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
915 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
916 return -EINVAL;
917
Paul Moore13541b32008-01-29 08:44:23 -0500918 netlbl_netlink_auditinfo(skb, &audit_info);
919
Paul Moore8cc44572008-01-29 08:44:21 -0500920 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
921 if (ret_val != 0)
922 return ret_val;
923 dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
924 ret_val = security_secctx_to_secid(
925 nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
926 nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
927 &secid);
928 if (ret_val != 0)
929 return ret_val;
930
931 return netlbl_unlhsh_add(&init_net,
Paul Moore13541b32008-01-29 08:44:23 -0500932 dev_name, addr, mask, addr_len, secid,
933 &audit_info);
Paul Moore8cc44572008-01-29 08:44:21 -0500934}
935
936/**
937 * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
938 * @skb: the NETLINK buffer
939 * @info: the Generic NETLINK info block
940 *
941 * Description:
942 * Process a user generated STATICADDDEF message and add a new default
943 * unlabeled connection entry. Returns zero on success, negative values on
944 * failure.
945 *
946 */
947static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
948 struct genl_info *info)
949{
950 int ret_val;
951 void *addr;
952 void *mask;
953 u32 addr_len;
954 u32 secid;
Paul Moore13541b32008-01-29 08:44:23 -0500955 struct netlbl_audit audit_info;
Paul Moore8cc44572008-01-29 08:44:21 -0500956
957 /* Don't allow users to add both IPv4 and IPv6 addresses for a
958 * single entry. However, allow users to create two entries, one each
959 * for IPv4 and IPv6, with the same LSM security context which should
960 * achieve the same result. */
961 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
962 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
963 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
964 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
965 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
966 return -EINVAL;
967
Paul Moore13541b32008-01-29 08:44:23 -0500968 netlbl_netlink_auditinfo(skb, &audit_info);
969
Paul Moore8cc44572008-01-29 08:44:21 -0500970 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
971 if (ret_val != 0)
972 return ret_val;
973 ret_val = security_secctx_to_secid(
974 nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
975 nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
976 &secid);
977 if (ret_val != 0)
978 return ret_val;
979
Paul Moore13541b32008-01-29 08:44:23 -0500980 return netlbl_unlhsh_add(&init_net,
981 NULL, addr, mask, addr_len, secid,
982 &audit_info);
Paul Moore8cc44572008-01-29 08:44:21 -0500983}
984
985/**
986 * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
987 * @skb: the NETLINK buffer
988 * @info: the Generic NETLINK info block
989 *
990 * Description:
991 * Process a user generated STATICREMOVE message and remove the specified
992 * unlabeled connection entry. Returns zero on success, negative values on
993 * failure.
994 *
995 */
996static int netlbl_unlabel_staticremove(struct sk_buff *skb,
997 struct genl_info *info)
998{
999 int ret_val;
1000 char *dev_name;
1001 void *addr;
1002 void *mask;
1003 u32 addr_len;
Paul Moore13541b32008-01-29 08:44:23 -05001004 struct netlbl_audit audit_info;
Paul Moore8cc44572008-01-29 08:44:21 -05001005
1006 /* See the note in netlbl_unlabel_staticadd() about not allowing both
1007 * IPv4 and IPv6 in the same entry. */
1008 if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
1009 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1010 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1011 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1012 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1013 return -EINVAL;
1014
Paul Moore13541b32008-01-29 08:44:23 -05001015 netlbl_netlink_auditinfo(skb, &audit_info);
1016
Paul Moore8cc44572008-01-29 08:44:21 -05001017 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1018 if (ret_val != 0)
1019 return ret_val;
1020 dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1021
Paul Moore13541b32008-01-29 08:44:23 -05001022 return netlbl_unlhsh_remove(&init_net,
1023 dev_name, addr, mask, addr_len,
1024 &audit_info);
Paul Moore8cc44572008-01-29 08:44:21 -05001025}
1026
1027/**
1028 * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1029 * @skb: the NETLINK buffer
1030 * @info: the Generic NETLINK info block
1031 *
1032 * Description:
1033 * Process a user generated STATICREMOVEDEF message and remove the default
1034 * unlabeled connection entry. Returns zero on success, negative values on
1035 * failure.
1036 *
1037 */
1038static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1039 struct genl_info *info)
1040{
1041 int ret_val;
1042 void *addr;
1043 void *mask;
1044 u32 addr_len;
Paul Moore13541b32008-01-29 08:44:23 -05001045 struct netlbl_audit audit_info;
Paul Moore8cc44572008-01-29 08:44:21 -05001046
1047 /* See the note in netlbl_unlabel_staticadd() about not allowing both
1048 * IPv4 and IPv6 in the same entry. */
1049 if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1050 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1051 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1052 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1053 return -EINVAL;
1054
Paul Moore13541b32008-01-29 08:44:23 -05001055 netlbl_netlink_auditinfo(skb, &audit_info);
1056
Paul Moore8cc44572008-01-29 08:44:21 -05001057 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1058 if (ret_val != 0)
1059 return ret_val;
1060
Paul Moore13541b32008-01-29 08:44:23 -05001061 return netlbl_unlhsh_remove(&init_net,
1062 NULL, addr, mask, addr_len,
1063 &audit_info);
Paul Moore8cc44572008-01-29 08:44:21 -05001064}
1065
1066
1067/**
1068 * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1069 * @cmd: command/message
1070 * @iface: the interface entry
1071 * @addr4: the IPv4 address entry
1072 * @addr6: the IPv6 address entry
1073 * @arg: the netlbl_unlhsh_walk_arg structure
1074 *
1075 * Description:
1076 * This function is designed to be used to generate a response for a
1077 * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6
1078 * can be specified, not both, the other unspecified entry should be set to
1079 * NULL by the caller. Returns the size of the message on success, negative
1080 * values on failure.
1081 *
1082 */
1083static int netlbl_unlabel_staticlist_gen(u32 cmd,
1084 const struct netlbl_unlhsh_iface *iface,
1085 const struct netlbl_unlhsh_addr4 *addr4,
1086 const struct netlbl_unlhsh_addr6 *addr6,
1087 void *arg)
1088{
1089 int ret_val = -ENOMEM;
1090 struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1091 struct net_device *dev;
1092 void *data;
1093 u32 secid;
1094 char *secctx;
1095 u32 secctx_len;
1096
Eric W. Biederman15e47302012-09-07 20:12:54 +00001097 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
Paul Moore8cc44572008-01-29 08:44:21 -05001098 cb_arg->seq, &netlbl_unlabel_gnl_family,
1099 NLM_F_MULTI, cmd);
1100 if (data == NULL)
1101 goto list_cb_failure;
1102
1103 if (iface->ifindex > 0) {
1104 dev = dev_get_by_index(&init_net, iface->ifindex);
Jesper Juhl794eb6b2008-04-17 23:22:54 -07001105 if (!dev) {
1106 ret_val = -ENODEV;
1107 goto list_cb_failure;
1108 }
Paul Moore8cc44572008-01-29 08:44:21 -05001109 ret_val = nla_put_string(cb_arg->skb,
1110 NLBL_UNLABEL_A_IFACE, dev->name);
1111 dev_put(dev);
1112 if (ret_val != 0)
1113 goto list_cb_failure;
1114 }
1115
1116 if (addr4) {
1117 struct in_addr addr_struct;
1118
Paul Moore61e10682008-10-10 10:16:32 -04001119 addr_struct.s_addr = addr4->list.addr;
Jiri Benc930345e2015-03-29 16:59:25 +02001120 ret_val = nla_put_in_addr(cb_arg->skb,
1121 NLBL_UNLABEL_A_IPV4ADDR,
1122 addr_struct.s_addr);
Paul Moore8cc44572008-01-29 08:44:21 -05001123 if (ret_val != 0)
1124 goto list_cb_failure;
1125
Paul Moore61e10682008-10-10 10:16:32 -04001126 addr_struct.s_addr = addr4->list.mask;
Jiri Benc930345e2015-03-29 16:59:25 +02001127 ret_val = nla_put_in_addr(cb_arg->skb,
1128 NLBL_UNLABEL_A_IPV4MASK,
1129 addr_struct.s_addr);
Paul Moore8cc44572008-01-29 08:44:21 -05001130 if (ret_val != 0)
1131 goto list_cb_failure;
1132
1133 secid = addr4->secid;
1134 } else {
Jiri Benc930345e2015-03-29 16:59:25 +02001135 ret_val = nla_put_in6_addr(cb_arg->skb,
1136 NLBL_UNLABEL_A_IPV6ADDR,
1137 &addr6->list.addr);
Paul Moore8cc44572008-01-29 08:44:21 -05001138 if (ret_val != 0)
1139 goto list_cb_failure;
1140
Jiri Benc930345e2015-03-29 16:59:25 +02001141 ret_val = nla_put_in6_addr(cb_arg->skb,
1142 NLBL_UNLABEL_A_IPV6MASK,
1143 &addr6->list.mask);
Paul Moore8cc44572008-01-29 08:44:21 -05001144 if (ret_val != 0)
1145 goto list_cb_failure;
1146
1147 secid = addr6->secid;
1148 }
1149
1150 ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
1151 if (ret_val != 0)
1152 goto list_cb_failure;
1153 ret_val = nla_put(cb_arg->skb,
1154 NLBL_UNLABEL_A_SECCTX,
1155 secctx_len,
1156 secctx);
1157 security_release_secctx(secctx, secctx_len);
1158 if (ret_val != 0)
1159 goto list_cb_failure;
1160
1161 cb_arg->seq++;
Johannes Berg053c0952015-01-16 22:09:00 +01001162 genlmsg_end(cb_arg->skb, data);
1163 return 0;
Paul Moore8cc44572008-01-29 08:44:21 -05001164
1165list_cb_failure:
1166 genlmsg_cancel(cb_arg->skb, data);
1167 return ret_val;
1168}
1169
1170/**
1171 * netlbl_unlabel_staticlist - Handle a STATICLIST message
1172 * @skb: the NETLINK buffer
1173 * @cb: the NETLINK callback
1174 *
1175 * Description:
1176 * Process a user generated STATICLIST message and dump the unlabeled
1177 * connection hash table in a form suitable for use in a kernel generated
1178 * STATICLIST message. Returns the length of @skb.
1179 *
1180 */
1181static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1182 struct netlink_callback *cb)
1183{
1184 struct netlbl_unlhsh_walk_arg cb_arg;
1185 u32 skip_bkt = cb->args[0];
1186 u32 skip_chain = cb->args[1];
Paul Moore8cc44572008-01-29 08:44:21 -05001187 u32 iter_bkt;
1188 u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1189 struct netlbl_unlhsh_iface *iface;
Paul Moore56196702008-10-10 10:16:29 -04001190 struct list_head *iter_list;
Paul Moore61e10682008-10-10 10:16:32 -04001191 struct netlbl_af4list *addr4;
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001192#if IS_ENABLED(CONFIG_IPV6)
Paul Moore61e10682008-10-10 10:16:32 -04001193 struct netlbl_af6list *addr6;
1194#endif
Paul Moore8cc44572008-01-29 08:44:21 -05001195
1196 cb_arg.nl_cb = cb;
1197 cb_arg.skb = skb;
1198 cb_arg.seq = cb->nlh->nlmsg_seq;
1199
1200 rcu_read_lock();
1201 for (iter_bkt = skip_bkt;
1202 iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1203 iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
Paul Moore56196702008-10-10 10:16:29 -04001204 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
1205 list_for_each_entry_rcu(iface, iter_list, list) {
Paul Moore8cc44572008-01-29 08:44:21 -05001206 if (!iface->valid ||
1207 iter_chain++ < skip_chain)
1208 continue;
Paul Moore61e10682008-10-10 10:16:32 -04001209 netlbl_af4list_foreach_rcu(addr4,
1210 &iface->addr4_list) {
Paul Moorea6a8fe92013-03-08 09:45:39 -05001211 if (iter_addr4++ < cb->args[2])
Paul Moore8cc44572008-01-29 08:44:21 -05001212 continue;
1213 if (netlbl_unlabel_staticlist_gen(
Paul Moore61e10682008-10-10 10:16:32 -04001214 NLBL_UNLABEL_C_STATICLIST,
1215 iface,
1216 netlbl_unlhsh_addr4_entry(addr4),
1217 NULL,
1218 &cb_arg) < 0) {
Paul Moore8cc44572008-01-29 08:44:21 -05001219 iter_addr4--;
1220 iter_chain--;
1221 goto unlabel_staticlist_return;
1222 }
1223 }
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001224#if IS_ENABLED(CONFIG_IPV6)
Paul Moore61e10682008-10-10 10:16:32 -04001225 netlbl_af6list_foreach_rcu(addr6,
1226 &iface->addr6_list) {
Paul Moorea6a8fe92013-03-08 09:45:39 -05001227 if (iter_addr6++ < cb->args[3])
Paul Moore8cc44572008-01-29 08:44:21 -05001228 continue;
1229 if (netlbl_unlabel_staticlist_gen(
Paul Moore61e10682008-10-10 10:16:32 -04001230 NLBL_UNLABEL_C_STATICLIST,
1231 iface,
1232 NULL,
1233 netlbl_unlhsh_addr6_entry(addr6),
1234 &cb_arg) < 0) {
Paul Moore8cc44572008-01-29 08:44:21 -05001235 iter_addr6--;
1236 iter_chain--;
1237 goto unlabel_staticlist_return;
1238 }
1239 }
Paul Moore61e10682008-10-10 10:16:32 -04001240#endif /* IPv6 */
Paul Moore8cc44572008-01-29 08:44:21 -05001241 }
1242 }
1243
1244unlabel_staticlist_return:
1245 rcu_read_unlock();
Paul Moore0c1233a2013-03-06 11:45:24 +00001246 cb->args[0] = iter_bkt;
1247 cb->args[1] = iter_chain;
1248 cb->args[2] = iter_addr4;
1249 cb->args[3] = iter_addr6;
Paul Moore8cc44572008-01-29 08:44:21 -05001250 return skb->len;
1251}
1252
1253/**
1254 * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1255 * @skb: the NETLINK buffer
1256 * @cb: the NETLINK callback
1257 *
1258 * Description:
1259 * Process a user generated STATICLISTDEF message and dump the default
1260 * unlabeled connection entry in a form suitable for use in a kernel generated
1261 * STATICLISTDEF message. Returns the length of @skb.
1262 *
1263 */
1264static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1265 struct netlink_callback *cb)
1266{
1267 struct netlbl_unlhsh_walk_arg cb_arg;
1268 struct netlbl_unlhsh_iface *iface;
Paul Moorea6a8fe92013-03-08 09:45:39 -05001269 u32 iter_addr4 = 0, iter_addr6 = 0;
Paul Moore61e10682008-10-10 10:16:32 -04001270 struct netlbl_af4list *addr4;
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001271#if IS_ENABLED(CONFIG_IPV6)
Paul Moore61e10682008-10-10 10:16:32 -04001272 struct netlbl_af6list *addr6;
1273#endif
Paul Moore8cc44572008-01-29 08:44:21 -05001274
1275 cb_arg.nl_cb = cb;
1276 cb_arg.skb = skb;
1277 cb_arg.seq = cb->nlh->nlmsg_seq;
1278
1279 rcu_read_lock();
1280 iface = rcu_dereference(netlbl_unlhsh_def);
1281 if (iface == NULL || !iface->valid)
1282 goto unlabel_staticlistdef_return;
1283
Paul Moore61e10682008-10-10 10:16:32 -04001284 netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
Paul Moorea6a8fe92013-03-08 09:45:39 -05001285 if (iter_addr4++ < cb->args[0])
Paul Moore8cc44572008-01-29 08:44:21 -05001286 continue;
1287 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
Paul Moore61e10682008-10-10 10:16:32 -04001288 iface,
1289 netlbl_unlhsh_addr4_entry(addr4),
1290 NULL,
1291 &cb_arg) < 0) {
Paul Moore8cc44572008-01-29 08:44:21 -05001292 iter_addr4--;
1293 goto unlabel_staticlistdef_return;
1294 }
1295 }
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001296#if IS_ENABLED(CONFIG_IPV6)
Paul Moore61e10682008-10-10 10:16:32 -04001297 netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
Paul Moorea6a8fe92013-03-08 09:45:39 -05001298 if (iter_addr6++ < cb->args[1])
Paul Moore8cc44572008-01-29 08:44:21 -05001299 continue;
1300 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
Paul Moore61e10682008-10-10 10:16:32 -04001301 iface,
1302 NULL,
1303 netlbl_unlhsh_addr6_entry(addr6),
1304 &cb_arg) < 0) {
Paul Moore8cc44572008-01-29 08:44:21 -05001305 iter_addr6--;
1306 goto unlabel_staticlistdef_return;
1307 }
1308 }
Paul Moore61e10682008-10-10 10:16:32 -04001309#endif /* IPv6 */
Paul Moore8cc44572008-01-29 08:44:21 -05001310
1311unlabel_staticlistdef_return:
1312 rcu_read_unlock();
Paul Moore0c1233a2013-03-06 11:45:24 +00001313 cb->args[0] = iter_addr4;
1314 cb->args[1] = iter_addr6;
Paul Moore8cc44572008-01-29 08:44:21 -05001315 return skb->len;
1316}
Paul Moore96cb8e32006-08-03 16:48:59 -07001317
1318/*
1319 * NetLabel Generic NETLINK Command Definitions
1320 */
1321
Johannes Berg4534de82013-11-14 17:14:46 +01001322static const struct genl_ops netlbl_unlabel_genl_ops[] = {
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001323 {
Paul Moore8cc44572008-01-29 08:44:21 -05001324 .cmd = NLBL_UNLABEL_C_STATICADD,
1325 .flags = GENL_ADMIN_PERM,
1326 .policy = netlbl_unlabel_genl_policy,
1327 .doit = netlbl_unlabel_staticadd,
1328 .dumpit = NULL,
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001329 },
1330 {
Paul Moore8cc44572008-01-29 08:44:21 -05001331 .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1332 .flags = GENL_ADMIN_PERM,
1333 .policy = netlbl_unlabel_genl_policy,
1334 .doit = netlbl_unlabel_staticremove,
1335 .dumpit = NULL,
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001336 },
1337 {
Paul Moore8cc44572008-01-29 08:44:21 -05001338 .cmd = NLBL_UNLABEL_C_STATICLIST,
1339 .flags = 0,
1340 .policy = netlbl_unlabel_genl_policy,
1341 .doit = NULL,
1342 .dumpit = netlbl_unlabel_staticlist,
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001343 },
1344 {
Paul Moore8cc44572008-01-29 08:44:21 -05001345 .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1346 .flags = GENL_ADMIN_PERM,
1347 .policy = netlbl_unlabel_genl_policy,
1348 .doit = netlbl_unlabel_staticadddef,
1349 .dumpit = NULL,
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001350 },
1351 {
Paul Moore8cc44572008-01-29 08:44:21 -05001352 .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1353 .flags = GENL_ADMIN_PERM,
1354 .policy = netlbl_unlabel_genl_policy,
1355 .doit = netlbl_unlabel_staticremovedef,
1356 .dumpit = NULL,
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001357 },
1358 {
Paul Moore8cc44572008-01-29 08:44:21 -05001359 .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1360 .flags = 0,
1361 .policy = netlbl_unlabel_genl_policy,
1362 .doit = NULL,
1363 .dumpit = netlbl_unlabel_staticlistdef,
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001364 },
1365 {
Paul Moore96cb8e32006-08-03 16:48:59 -07001366 .cmd = NLBL_UNLABEL_C_ACCEPT,
Paul Moorefd385852006-09-25 15:56:37 -07001367 .flags = GENL_ADMIN_PERM,
1368 .policy = netlbl_unlabel_genl_policy,
Paul Moore96cb8e32006-08-03 16:48:59 -07001369 .doit = netlbl_unlabel_accept,
1370 .dumpit = NULL,
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001371 },
1372 {
Paul Moore96cb8e32006-08-03 16:48:59 -07001373 .cmd = NLBL_UNLABEL_C_LIST,
1374 .flags = 0,
Paul Moorefd385852006-09-25 15:56:37 -07001375 .policy = netlbl_unlabel_genl_policy,
Paul Moore96cb8e32006-08-03 16:48:59 -07001376 .doit = netlbl_unlabel_list,
1377 .dumpit = NULL,
Pavel Emelyanov227c43c2008-02-17 22:33:16 -08001378 },
Paul Moore96cb8e32006-08-03 16:48:59 -07001379};
1380
Paul Moore96cb8e32006-08-03 16:48:59 -07001381/*
1382 * NetLabel Generic NETLINK Protocol Functions
1383 */
1384
1385/**
1386 * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
1387 *
1388 * Description:
1389 * Register the unlabeled packet NetLabel component with the Generic NETLINK
1390 * mechanism. Returns zero on success, negative values on failure.
1391 *
1392 */
Pavel Emelyanov05705e42008-02-17 22:33:57 -08001393int __init netlbl_unlabel_genl_init(void)
Paul Moore96cb8e32006-08-03 16:48:59 -07001394{
Michał Mirosław7ae740d2009-05-21 10:34:05 +00001395 return genl_register_family_with_ops(&netlbl_unlabel_gnl_family,
Johannes Bergc53ed742013-11-19 15:19:31 +01001396 netlbl_unlabel_genl_ops);
Paul Moore96cb8e32006-08-03 16:48:59 -07001397}
1398
1399/*
1400 * NetLabel KAPI Hooks
1401 */
1402
Paul Moore8cc44572008-01-29 08:44:21 -05001403static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1404 .notifier_call = netlbl_unlhsh_netdev_handler,
1405};
1406
1407/**
1408 * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1409 * @size: the number of bits to use for the hash buckets
1410 *
1411 * Description:
1412 * Initializes the unlabeled connection hash table and registers a network
1413 * device notification handler. This function should only be called by the
1414 * NetLabel subsystem itself during initialization. Returns zero on success,
1415 * non-zero values on error.
1416 *
1417 */
Pavel Emelyanov05705e42008-02-17 22:33:57 -08001418int __init netlbl_unlabel_init(u32 size)
Paul Moore8cc44572008-01-29 08:44:21 -05001419{
1420 u32 iter;
1421 struct netlbl_unlhsh_tbl *hsh_tbl;
1422
1423 if (size == 0)
1424 return -EINVAL;
1425
1426 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1427 if (hsh_tbl == NULL)
1428 return -ENOMEM;
1429 hsh_tbl->size = 1 << size;
1430 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1431 sizeof(struct list_head),
1432 GFP_KERNEL);
1433 if (hsh_tbl->tbl == NULL) {
1434 kfree(hsh_tbl);
1435 return -ENOMEM;
1436 }
1437 for (iter = 0; iter < hsh_tbl->size; iter++)
1438 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
1439
Paul Moore8cc44572008-01-29 08:44:21 -05001440 spin_lock(&netlbl_unlhsh_lock);
Eric Dumazetcf778b02012-01-12 04:41:32 +00001441 rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
Paul Moore8cc44572008-01-29 08:44:21 -05001442 spin_unlock(&netlbl_unlhsh_lock);
Paul Moore8cc44572008-01-29 08:44:21 -05001443
1444 register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
1445
1446 return 0;
1447}
1448
Paul Moore96cb8e32006-08-03 16:48:59 -07001449/**
1450 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
Paul Moore8cc44572008-01-29 08:44:21 -05001451 * @skb: the packet
1452 * @family: protocol family
Paul Moore96cb8e32006-08-03 16:48:59 -07001453 * @secattr: the security attributes
1454 *
1455 * Description:
1456 * Determine the security attributes, if any, for an unlabled packet and return
1457 * them in @secattr. Returns zero on success and negative values on failure.
1458 *
1459 */
Paul Moore8cc44572008-01-29 08:44:21 -05001460int netlbl_unlabel_getattr(const struct sk_buff *skb,
1461 u16 family,
1462 struct netlbl_lsm_secattr *secattr)
Paul Moore96cb8e32006-08-03 16:48:59 -07001463{
Paul Moore8cc44572008-01-29 08:44:21 -05001464 struct netlbl_unlhsh_iface *iface;
1465
1466 rcu_read_lock();
Paul Mooreb914f3a2010-04-01 10:43:57 +00001467 iface = netlbl_unlhsh_search_iface(skb->skb_iif);
Paul Moore8cc44572008-01-29 08:44:21 -05001468 if (iface == NULL)
Paul Mooreb914f3a2010-04-01 10:43:57 +00001469 iface = rcu_dereference(netlbl_unlhsh_def);
1470 if (iface == NULL || !iface->valid)
Paul Moore8cc44572008-01-29 08:44:21 -05001471 goto unlabel_getattr_nolabel;
1472 switch (family) {
Pavel Emelyanov56628b12008-02-12 22:37:19 -08001473 case PF_INET: {
1474 struct iphdr *hdr4;
Paul Moore61e10682008-10-10 10:16:32 -04001475 struct netlbl_af4list *addr4;
Pavel Emelyanov56628b12008-02-12 22:37:19 -08001476
Paul Moore8cc44572008-01-29 08:44:21 -05001477 hdr4 = ip_hdr(skb);
Paul Moore61e10682008-10-10 10:16:32 -04001478 addr4 = netlbl_af4list_search(hdr4->saddr,
1479 &iface->addr4_list);
Paul Moore8cc44572008-01-29 08:44:21 -05001480 if (addr4 == NULL)
1481 goto unlabel_getattr_nolabel;
Paul Moore61e10682008-10-10 10:16:32 -04001482 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
Paul Moore8cc44572008-01-29 08:44:21 -05001483 break;
Pavel Emelyanov56628b12008-02-12 22:37:19 -08001484 }
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001485#if IS_ENABLED(CONFIG_IPV6)
Pavel Emelyanov56628b12008-02-12 22:37:19 -08001486 case PF_INET6: {
1487 struct ipv6hdr *hdr6;
Paul Moore61e10682008-10-10 10:16:32 -04001488 struct netlbl_af6list *addr6;
Pavel Emelyanov56628b12008-02-12 22:37:19 -08001489
Paul Moore8cc44572008-01-29 08:44:21 -05001490 hdr6 = ipv6_hdr(skb);
Paul Moore61e10682008-10-10 10:16:32 -04001491 addr6 = netlbl_af6list_search(&hdr6->saddr,
1492 &iface->addr6_list);
Paul Moore8cc44572008-01-29 08:44:21 -05001493 if (addr6 == NULL)
1494 goto unlabel_getattr_nolabel;
Paul Moore61e10682008-10-10 10:16:32 -04001495 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
Paul Moore8cc44572008-01-29 08:44:21 -05001496 break;
Pavel Emelyanov56628b12008-02-12 22:37:19 -08001497 }
Paul Moore8cc44572008-01-29 08:44:21 -05001498#endif /* IPv6 */
1499 default:
1500 goto unlabel_getattr_nolabel;
1501 }
1502 rcu_read_unlock();
1503
1504 secattr->flags |= NETLBL_SECATTR_SECID;
1505 secattr->type = NETLBL_NLTYPE_UNLABELED;
1506 return 0;
1507
1508unlabel_getattr_nolabel:
1509 rcu_read_unlock();
Paul Moorec783f1c2008-01-29 08:37:52 -05001510 if (netlabel_unlabel_acceptflg == 0)
1511 return -ENOMSG;
Paul Moore16efd452008-01-29 08:37:59 -05001512 secattr->type = NETLBL_NLTYPE_UNLABELED;
Paul Moorec783f1c2008-01-29 08:37:52 -05001513 return 0;
Paul Moore96cb8e32006-08-03 16:48:59 -07001514}
1515
1516/**
1517 * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
1518 *
1519 * Description:
1520 * Set the default NetLabel configuration to allow incoming unlabeled packets
1521 * and to send unlabeled network traffic by default.
1522 *
1523 */
Pavel Emelyanov05705e42008-02-17 22:33:57 -08001524int __init netlbl_unlabel_defconf(void)
Paul Moore96cb8e32006-08-03 16:48:59 -07001525{
1526 int ret_val;
1527 struct netlbl_dom_map *entry;
Paul Moore95d4e6b2006-09-29 17:05:05 -07001528 struct netlbl_audit audit_info;
Paul Moore32f50cd2006-09-28 14:51:47 -07001529
Paul Moore95d4e6b2006-09-29 17:05:05 -07001530 /* Only the kernel is allowed to call this function and the only time
1531 * it is called is at bootup before the audit subsystem is reporting
1532 * messages so don't worry to much about these values. */
1533 security_task_getsecid(current, &audit_info.secid);
Eric W. Biedermane1760bd2012-09-10 22:39:43 -07001534 audit_info.loginuid = GLOBAL_ROOT_UID;
Eric Paris25323862008-04-18 10:09:25 -04001535 audit_info.sessionid = 0;
Paul Moore96cb8e32006-08-03 16:48:59 -07001536
1537 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1538 if (entry == NULL)
1539 return -ENOMEM;
Paul Moore6a8b7f02013-08-02 14:45:08 -04001540 entry->def.type = NETLBL_NLTYPE_UNLABELED;
Paul Moore95d4e6b2006-09-29 17:05:05 -07001541 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
Paul Moore96cb8e32006-08-03 16:48:59 -07001542 if (ret_val != 0)
1543 return ret_val;
1544
Paul Moore95d4e6b2006-09-29 17:05:05 -07001545 netlbl_unlabel_acceptflg_set(1, &audit_info);
Paul Moore96cb8e32006-08-03 16:48:59 -07001546
1547 return 0;
1548}