1// SPDX-License-Identifier: GPL-2.0-or-later
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 *
9 * Author: Paul Moore <paul@paul-moore.com>
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008
14 */
15
16#include <linux/types.h>
17#include <linux/rcupdate.h>
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>
23#include <linux/audit.h>
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>
31#include <linux/slab.h>
32#include <net/sock.h>
33#include <net/netlink.h>
34#include <net/genetlink.h>
35#include <net/ip.h>
36#include <net/ipv6.h>
37#include <net/net_namespace.h>
38#include <net/netlabel.h>
39#include <asm/bug.h>
40#include <linux/atomic.h>
41
42#include "netlabel_user.h"
43#include "netlabel_addrlist.h"
44#include "netlabel_domainhash.h"
45#include "netlabel_unlabeled.h"
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 */
62struct netlbl_unlhsh_tbl {
63 struct list_head *tbl;
64 u32 size;
65};
66#define netlbl_unlhsh_addr4_entry(iter) \
67 container_of(iter, struct netlbl_unlhsh_addr4, list)
68struct netlbl_unlhsh_addr4 {
69 u32 secid;
70
71 struct netlbl_af4list list;
72 struct rcu_head rcu;
73};
74#define netlbl_unlhsh_addr6_entry(iter) \
75 container_of(iter, struct netlbl_unlhsh_addr6, list)
76struct netlbl_unlhsh_addr6 {
77 u32 secid;
78
79 struct netlbl_af6list list;
80 struct rcu_head rcu;
81};
82struct 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() */
93struct 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 */
102static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
103#define netlbl_unlhsh_rcu_deref(p) \
104 rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock))
105static struct netlbl_unlhsh_tbl __rcu *netlbl_unlhsh;
106static struct netlbl_unlhsh_iface __rcu *netlbl_unlhsh_def;
107
108/* Accept unlabeled packets flag */
109static u8 netlabel_unlabel_acceptflg;
110
111/* NetLabel Generic NETLINK unlabeled family */
112static struct genl_family netlbl_unlabel_gnl_family;
113
114/* NetLabel Netlink attribute policy */
115static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
116 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
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 }
128};
129
130/*
131 * Unlabeled Connection Hash Table Functions
132 */
133
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 */
147static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
148{
149 struct netlbl_unlhsh_iface *iface;
150 struct netlbl_af4list *iter4;
151 struct netlbl_af4list *tmp4;
152#if IS_ENABLED(CONFIG_IPV6)
153 struct netlbl_af6list *iter6;
154 struct netlbl_af6list *tmp6;
155#endif /* IPv6 */
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
162 netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
163 netlbl_af4list_remove_entry(entry: iter4);
164 kfree(netlbl_unlhsh_addr4_entry(iter4));
165 }
166#if IS_ENABLED(CONFIG_IPV6)
167 netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
168 netlbl_af6list_remove_entry(entry: iter6);
169 kfree(netlbl_unlhsh_addr6_entry(iter6));
170 }
171#endif /* IPv6 */
172 kfree(objp: 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
182 * ensuring that the hash table is protected with either a RCU read lock or
183 * the hash table lock.
184 *
185 */
186static u32 netlbl_unlhsh_hash(int ifindex)
187{
188 return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
189}
190
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
198 * caller is responsible for ensuring that the hash table is protected with
199 * either a RCU read lock or the hash table lock.
200 *
201 */
202static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
203{
204 u32 bkt;
205 struct list_head *bkt_list;
206 struct netlbl_unlhsh_iface *iter;
207
208 bkt = netlbl_unlhsh_hash(ifindex);
209 bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
210 list_for_each_entry_rcu(iter, bkt_list, list,
211 lockdep_is_held(&netlbl_unlhsh_lock))
212 if (iter->valid && iter->ifindex == ifindex)
213 return iter;
214
215 return NULL;
216}
217
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
228 * a negative value is returned.
229 *
230 */
231static 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{
236 int ret_val;
237 struct netlbl_unlhsh_addr4 *entry;
238
239 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
240 if (entry == NULL)
241 return -ENOMEM;
242
243 entry->list.addr = addr->s_addr & mask->s_addr;
244 entry->list.mask = mask->s_addr;
245 entry->list.valid = 1;
246 entry->secid = secid;
247
248 spin_lock(lock: &netlbl_unlhsh_lock);
249 ret_val = netlbl_af4list_add(entry: &entry->list, head: &iface->addr4_list);
250 spin_unlock(lock: &netlbl_unlhsh_lock);
251
252 if (ret_val != 0)
253 kfree(objp: entry);
254 return ret_val;
255}
256
257#if IS_ENABLED(CONFIG_IPV6)
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
268 * a negative value is returned.
269 *
270 */
271static 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{
276 int ret_val;
277 struct netlbl_unlhsh_addr6 *entry;
278
279 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
280 if (entry == NULL)
281 return -ENOMEM;
282
283 entry->list.addr = *addr;
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];
288 entry->list.mask = *mask;
289 entry->list.valid = 1;
290 entry->secid = secid;
291
292 spin_lock(lock: &netlbl_unlhsh_lock);
293 ret_val = netlbl_af6list_add(entry: &entry->list, head: &iface->addr6_list);
294 spin_unlock(lock: &netlbl_unlhsh_lock);
295
296 if (ret_val != 0)
297 kfree(objp: entry);
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
309 * is returned.
310 *
311 */
312static 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(list: &iface->addr4_list);
323 INIT_LIST_HEAD(list: &iface->addr6_list);
324 iface->valid = 1;
325
326 spin_lock(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(new: &iface->list,
332 head: &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
333 } else {
334 INIT_LIST_HEAD(list: &iface->list);
335 if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
336 goto add_iface_failure;
337 rcu_assign_pointer(netlbl_unlhsh_def, iface);
338 }
339 spin_unlock(lock: &netlbl_unlhsh_lock);
340
341 return iface;
342
343add_iface_failure:
344 spin_unlock(lock: &netlbl_unlhsh_lock);
345 kfree(objp: 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
357 * @audit_info: NetLabel audit information
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 */
364int 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)
371{
372 int ret_val;
373 int ifindex;
374 struct net_device *dev;
375 struct netlbl_unlhsh_iface *iface;
376 struct audit_buffer *audit_buf = NULL;
377 struct lsm_context ctx;
378
379 if (addr_len != sizeof(struct in_addr) &&
380 addr_len != sizeof(struct in6_addr))
381 return -EINVAL;
382
383 rcu_read_lock();
384 if (dev_name != NULL) {
385 dev = dev_get_by_name_rcu(net, name: dev_name);
386 if (dev == NULL) {
387 ret_val = -ENODEV;
388 goto unlhsh_add_return;
389 }
390 ifindex = dev->ifindex;
391 iface = netlbl_unlhsh_search_iface(ifindex);
392 } else {
393 ifindex = 0;
394 iface = rcu_dereference(netlbl_unlhsh_def);
395 }
396 if (iface == NULL) {
397 iface = netlbl_unlhsh_add_iface(ifindex);
398 if (iface == NULL) {
399 ret_val = -ENOMEM;
400 goto unlhsh_add_return;
401 }
402 }
403 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
404 audit_info);
405 switch (addr_len) {
406 case sizeof(struct in_addr): {
407 const struct in_addr *addr4 = addr;
408 const struct in_addr *mask4 = mask;
409
410 ret_val = netlbl_unlhsh_add_addr4(iface, addr: addr4, mask: mask4, secid);
411 if (audit_buf != NULL)
412 netlbl_af4list_audit_addr(audit_buf, src: 1,
413 dev: dev_name,
414 addr: addr4->s_addr,
415 mask: mask4->s_addr);
416 break;
417 }
418#if IS_ENABLED(CONFIG_IPV6)
419 case sizeof(struct in6_addr): {
420 const struct in6_addr *addr6 = addr;
421 const struct in6_addr *mask6 = mask;
422
423 ret_val = netlbl_unlhsh_add_addr6(iface, addr: addr6, mask: mask6, secid);
424 if (audit_buf != NULL)
425 netlbl_af6list_audit_addr(audit_buf, src: 1,
426 dev: dev_name,
427 addr: addr6, mask: mask6);
428 break;
429 }
430#endif /* IPv6 */
431 default:
432 ret_val = -EINVAL;
433 }
434 if (ret_val == 0)
435 atomic_inc(v: &netlabel_mgmt_protocount);
436
437unlhsh_add_return:
438 rcu_read_unlock();
439 if (audit_buf != NULL) {
440 if (security_secid_to_secctx(secid, cp: &ctx) >= 0) {
441 audit_log_format(ab: audit_buf, fmt: " sec_obj=%s", ctx.context);
442 security_release_secctx(cp: &ctx);
443 }
444 audit_log_format(ab: audit_buf, fmt: " res=%u", ret_val == 0 ? 1 : 0);
445 audit_log_end(ab: audit_buf);
446 }
447 return ret_val;
448}
449
450/**
451 * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
452 * @net: network namespace
453 * @iface: interface entry
454 * @addr: IP address
455 * @mask: IP address mask
456 * @audit_info: NetLabel audit information
457 *
458 * Description:
459 * Remove an IP address entry from the unlabeled connection hash table.
460 * Returns zero on success, negative values on failure.
461 *
462 */
463static int netlbl_unlhsh_remove_addr4(struct net *net,
464 struct netlbl_unlhsh_iface *iface,
465 const struct in_addr *addr,
466 const struct in_addr *mask,
467 struct netlbl_audit *audit_info)
468{
469 struct netlbl_af4list *list_entry;
470 struct netlbl_unlhsh_addr4 *entry;
471 struct audit_buffer *audit_buf;
472 struct net_device *dev;
473 struct lsm_context ctx;
474
475 spin_lock(lock: &netlbl_unlhsh_lock);
476 list_entry = netlbl_af4list_remove(addr: addr->s_addr, mask: mask->s_addr,
477 head: &iface->addr4_list);
478 spin_unlock(lock: &netlbl_unlhsh_lock);
479 if (list_entry != NULL)
480 entry = netlbl_unlhsh_addr4_entry(list_entry);
481 else
482 entry = NULL;
483
484 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
485 audit_info);
486 if (audit_buf != NULL) {
487 dev = dev_get_by_index(net, ifindex: iface->ifindex);
488 netlbl_af4list_audit_addr(audit_buf, src: 1,
489 dev: (dev != NULL ? dev->name : NULL),
490 addr: addr->s_addr, mask: mask->s_addr);
491 dev_put(dev);
492 if (entry != NULL &&
493 security_secid_to_secctx(secid: entry->secid, cp: &ctx) >= 0) {
494 audit_log_format(ab: audit_buf, fmt: " sec_obj=%s", ctx.context);
495 security_release_secctx(cp: &ctx);
496 }
497 audit_log_format(ab: audit_buf, fmt: " res=%u", entry != NULL ? 1 : 0);
498 audit_log_end(ab: audit_buf);
499 }
500
501 if (entry == NULL)
502 return -ENOENT;
503
504 kfree_rcu(entry, rcu);
505 return 0;
506}
507
508#if IS_ENABLED(CONFIG_IPV6)
509/**
510 * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
511 * @net: network namespace
512 * @iface: interface entry
513 * @addr: IP address
514 * @mask: IP address mask
515 * @audit_info: NetLabel audit information
516 *
517 * Description:
518 * Remove an IP address entry from the unlabeled connection hash table.
519 * Returns zero on success, negative values on failure.
520 *
521 */
522static int netlbl_unlhsh_remove_addr6(struct net *net,
523 struct netlbl_unlhsh_iface *iface,
524 const struct in6_addr *addr,
525 const struct in6_addr *mask,
526 struct netlbl_audit *audit_info)
527{
528 struct netlbl_af6list *list_entry;
529 struct netlbl_unlhsh_addr6 *entry;
530 struct audit_buffer *audit_buf;
531 struct net_device *dev;
532 struct lsm_context ctx;
533
534 spin_lock(lock: &netlbl_unlhsh_lock);
535 list_entry = netlbl_af6list_remove(addr, mask, head: &iface->addr6_list);
536 spin_unlock(lock: &netlbl_unlhsh_lock);
537 if (list_entry != NULL)
538 entry = netlbl_unlhsh_addr6_entry(list_entry);
539 else
540 entry = NULL;
541
542 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
543 audit_info);
544 if (audit_buf != NULL) {
545 dev = dev_get_by_index(net, ifindex: iface->ifindex);
546 netlbl_af6list_audit_addr(audit_buf, src: 1,
547 dev: (dev != NULL ? dev->name : NULL),
548 addr, mask);
549 dev_put(dev);
550 if (entry != NULL &&
551 security_secid_to_secctx(secid: entry->secid, cp: &ctx) >= 0) {
552 audit_log_format(ab: audit_buf, fmt: " sec_obj=%s", ctx.context);
553 security_release_secctx(cp: &ctx);
554 }
555 audit_log_format(ab: audit_buf, fmt: " res=%u", entry != NULL ? 1 : 0);
556 audit_log_end(ab: audit_buf);
557 }
558
559 if (entry == NULL)
560 return -ENOENT;
561
562 kfree_rcu(entry, rcu);
563 return 0;
564}
565#endif /* IPv6 */
566
567/**
568 * netlbl_unlhsh_condremove_iface - Remove an interface entry
569 * @iface: the interface entry
570 *
571 * Description:
572 * Remove an interface entry from the unlabeled connection hash table if it is
573 * empty. An interface entry is considered to be empty if there are no
574 * address entries assigned to it.
575 *
576 */
577static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
578{
579 struct netlbl_af4list *iter4;
580#if IS_ENABLED(CONFIG_IPV6)
581 struct netlbl_af6list *iter6;
582#endif /* IPv6 */
583
584 spin_lock(lock: &netlbl_unlhsh_lock);
585 netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
586 goto unlhsh_condremove_failure;
587#if IS_ENABLED(CONFIG_IPV6)
588 netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
589 goto unlhsh_condremove_failure;
590#endif /* IPv6 */
591 iface->valid = 0;
592 if (iface->ifindex > 0)
593 list_del_rcu(entry: &iface->list);
594 else
595 RCU_INIT_POINTER(netlbl_unlhsh_def, NULL);
596 spin_unlock(lock: &netlbl_unlhsh_lock);
597
598 call_rcu(head: &iface->rcu, func: netlbl_unlhsh_free_iface);
599 return;
600
601unlhsh_condremove_failure:
602 spin_unlock(lock: &netlbl_unlhsh_lock);
603}
604
605/**
606 * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
607 * @net: network namespace
608 * @dev_name: interface name
609 * @addr: IP address in network byte order
610 * @mask: address mask in network byte order
611 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
612 * @audit_info: NetLabel audit information
613 *
614 * Description:
615 * Removes and existing entry from the unlabeled connection hash table.
616 * Returns zero on success, negative values on failure.
617 *
618 */
619int netlbl_unlhsh_remove(struct net *net,
620 const char *dev_name,
621 const void *addr,
622 const void *mask,
623 u32 addr_len,
624 struct netlbl_audit *audit_info)
625{
626 int ret_val;
627 struct net_device *dev;
628 struct netlbl_unlhsh_iface *iface;
629
630 if (addr_len != sizeof(struct in_addr) &&
631 addr_len != sizeof(struct in6_addr))
632 return -EINVAL;
633
634 rcu_read_lock();
635 if (dev_name != NULL) {
636 dev = dev_get_by_name_rcu(net, name: dev_name);
637 if (dev == NULL) {
638 ret_val = -ENODEV;
639 goto unlhsh_remove_return;
640 }
641 iface = netlbl_unlhsh_search_iface(ifindex: dev->ifindex);
642 } else
643 iface = rcu_dereference(netlbl_unlhsh_def);
644 if (iface == NULL) {
645 ret_val = -ENOENT;
646 goto unlhsh_remove_return;
647 }
648 switch (addr_len) {
649 case sizeof(struct in_addr):
650 ret_val = netlbl_unlhsh_remove_addr4(net,
651 iface, addr, mask,
652 audit_info);
653 break;
654#if IS_ENABLED(CONFIG_IPV6)
655 case sizeof(struct in6_addr):
656 ret_val = netlbl_unlhsh_remove_addr6(net,
657 iface, addr, mask,
658 audit_info);
659 break;
660#endif /* IPv6 */
661 default:
662 ret_val = -EINVAL;
663 }
664 if (ret_val == 0) {
665 netlbl_unlhsh_condremove_iface(iface);
666 atomic_dec(v: &netlabel_mgmt_protocount);
667 }
668
669unlhsh_remove_return:
670 rcu_read_unlock();
671 return ret_val;
672}
673
674/*
675 * General Helper Functions
676 */
677
678/**
679 * netlbl_unlhsh_netdev_handler - Network device notification handler
680 * @this: notifier block
681 * @event: the event
682 * @ptr: the netdevice notifier info (cast to void)
683 *
684 * Description:
685 * Handle network device events, although at present all we care about is a
686 * network device going away. In the case of a device going away we clear any
687 * related entries from the unlabeled connection hash table.
688 *
689 */
690static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
691 unsigned long event, void *ptr)
692{
693 struct net_device *dev = netdev_notifier_info_to_dev(info: ptr);
694 struct netlbl_unlhsh_iface *iface = NULL;
695
696 if (!net_eq(net1: dev_net(dev), net2: &init_net))
697 return NOTIFY_DONE;
698
699 /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
700 if (event == NETDEV_DOWN) {
701 spin_lock(lock: &netlbl_unlhsh_lock);
702 iface = netlbl_unlhsh_search_iface(ifindex: dev->ifindex);
703 if (iface != NULL && iface->valid) {
704 iface->valid = 0;
705 list_del_rcu(entry: &iface->list);
706 } else
707 iface = NULL;
708 spin_unlock(lock: &netlbl_unlhsh_lock);
709 }
710
711 if (iface != NULL)
712 call_rcu(head: &iface->rcu, func: netlbl_unlhsh_free_iface);
713
714 return NOTIFY_DONE;
715}
716
717/**
718 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
719 * @value: desired value
720 * @audit_info: NetLabel audit information
721 *
722 * Description:
723 * Set the value of the unlabeled accept flag to @value.
724 *
725 */
726static void netlbl_unlabel_acceptflg_set(u8 value,
727 struct netlbl_audit *audit_info)
728{
729 struct audit_buffer *audit_buf;
730 u8 old_val;
731
732 old_val = netlabel_unlabel_acceptflg;
733 netlabel_unlabel_acceptflg = value;
734 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
735 audit_info);
736 if (audit_buf != NULL) {
737 audit_log_format(ab: audit_buf,
738 fmt: " unlbl_accept=%u old=%u", value, old_val);
739 audit_log_end(ab: audit_buf);
740 }
741}
742
743/**
744 * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
745 * @info: the Generic NETLINK info block
746 * @addr: the IP address
747 * @mask: the IP address mask
748 * @len: the address length
749 *
750 * Description:
751 * Examine the Generic NETLINK message and extract the IP address information.
752 * Returns zero on success, negative values on failure.
753 *
754 */
755static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
756 void **addr,
757 void **mask,
758 u32 *len)
759{
760 u32 addr_len;
761
762 if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR] &&
763 info->attrs[NLBL_UNLABEL_A_IPV4MASK]) {
764 addr_len = nla_len(nla: info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
765 if (addr_len != sizeof(struct in_addr) &&
766 addr_len != nla_len(nla: info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
767 return -EINVAL;
768 *len = addr_len;
769 *addr = nla_data(nla: info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
770 *mask = nla_data(nla: info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
771 return 0;
772 } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
773 addr_len = nla_len(nla: info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
774 if (addr_len != sizeof(struct in6_addr) &&
775 addr_len != nla_len(nla: info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
776 return -EINVAL;
777 *len = addr_len;
778 *addr = nla_data(nla: info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
779 *mask = nla_data(nla: info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
780 return 0;
781 }
782
783 return -EINVAL;
784}
785
786/*
787 * NetLabel Command Handlers
788 */
789
790/**
791 * netlbl_unlabel_accept - Handle an ACCEPT message
792 * @skb: the NETLINK buffer
793 * @info: the Generic NETLINK info block
794 *
795 * Description:
796 * Process a user generated ACCEPT message and set the accept flag accordingly.
797 * Returns zero on success, negative values on failure.
798 *
799 */
800static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
801{
802 u8 value;
803 struct netlbl_audit audit_info;
804
805 if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
806 value = nla_get_u8(nla: info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
807 if (value == 1 || value == 0) {
808 netlbl_netlink_auditinfo(audit_info: &audit_info);
809 netlbl_unlabel_acceptflg_set(value, audit_info: &audit_info);
810 return 0;
811 }
812 }
813
814 return -EINVAL;
815}
816
817/**
818 * netlbl_unlabel_list - Handle a LIST message
819 * @skb: the NETLINK buffer
820 * @info: the Generic NETLINK info block
821 *
822 * Description:
823 * Process a user generated LIST message and respond with the current status.
824 * Returns zero on success, negative values on failure.
825 *
826 */
827static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
828{
829 int ret_val = -EINVAL;
830 struct sk_buff *ans_skb;
831 void *data;
832
833 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
834 if (ans_skb == NULL)
835 goto list_failure;
836 data = genlmsg_put_reply(skb: ans_skb, info, family: &netlbl_unlabel_gnl_family,
837 flags: 0, cmd: NLBL_UNLABEL_C_LIST);
838 if (data == NULL) {
839 ret_val = -ENOMEM;
840 goto list_failure;
841 }
842
843 ret_val = nla_put_u8(skb: ans_skb,
844 attrtype: NLBL_UNLABEL_A_ACPTFLG,
845 value: netlabel_unlabel_acceptflg);
846 if (ret_val != 0)
847 goto list_failure;
848
849 genlmsg_end(skb: ans_skb, hdr: data);
850 return genlmsg_reply(skb: ans_skb, info);
851
852list_failure:
853 kfree_skb(skb: ans_skb);
854 return ret_val;
855}
856
857/**
858 * netlbl_unlabel_staticadd - Handle a STATICADD message
859 * @skb: the NETLINK buffer
860 * @info: the Generic NETLINK info block
861 *
862 * Description:
863 * Process a user generated STATICADD message and add a new unlabeled
864 * connection entry to the hash table. Returns zero on success, negative
865 * values on failure.
866 *
867 */
868static int netlbl_unlabel_staticadd(struct sk_buff *skb,
869 struct genl_info *info)
870{
871 int ret_val;
872 char *dev_name;
873 void *addr;
874 void *mask;
875 u32 addr_len;
876 u32 secid;
877 struct netlbl_audit audit_info;
878
879 /* Don't allow users to add both IPv4 and IPv6 addresses for a
880 * single entry. However, allow users to create two entries, one each
881 * for IPv4 and IPv6, with the same LSM security context which should
882 * achieve the same result. */
883 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
884 !info->attrs[NLBL_UNLABEL_A_IFACE] ||
885 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
886 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
887 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
888 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
889 return -EINVAL;
890
891 netlbl_netlink_auditinfo(audit_info: &audit_info);
892
893 ret_val = netlbl_unlabel_addrinfo_get(info, addr: &addr, mask: &mask, len: &addr_len);
894 if (ret_val != 0)
895 return ret_val;
896 dev_name = nla_data(nla: info->attrs[NLBL_UNLABEL_A_IFACE]);
897 ret_val = security_secctx_to_secid(
898 secdata: nla_data(nla: info->attrs[NLBL_UNLABEL_A_SECCTX]),
899 seclen: nla_len(nla: info->attrs[NLBL_UNLABEL_A_SECCTX]),
900 secid: &secid);
901 if (ret_val != 0)
902 return ret_val;
903
904 return netlbl_unlhsh_add(net: &init_net,
905 dev_name, addr, mask, addr_len, secid,
906 audit_info: &audit_info);
907}
908
909/**
910 * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
911 * @skb: the NETLINK buffer
912 * @info: the Generic NETLINK info block
913 *
914 * Description:
915 * Process a user generated STATICADDDEF message and add a new default
916 * unlabeled connection entry. Returns zero on success, negative values on
917 * failure.
918 *
919 */
920static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
921 struct genl_info *info)
922{
923 int ret_val;
924 void *addr;
925 void *mask;
926 u32 addr_len;
927 u32 secid;
928 struct netlbl_audit audit_info;
929
930 /* Don't allow users to add both IPv4 and IPv6 addresses for a
931 * single entry. However, allow users to create two entries, one each
932 * for IPv4 and IPv6, with the same LSM security context which should
933 * achieve the same result. */
934 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
935 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
936 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
937 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
938 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
939 return -EINVAL;
940
941 netlbl_netlink_auditinfo(audit_info: &audit_info);
942
943 ret_val = netlbl_unlabel_addrinfo_get(info, addr: &addr, mask: &mask, len: &addr_len);
944 if (ret_val != 0)
945 return ret_val;
946 ret_val = security_secctx_to_secid(
947 secdata: nla_data(nla: info->attrs[NLBL_UNLABEL_A_SECCTX]),
948 seclen: nla_len(nla: info->attrs[NLBL_UNLABEL_A_SECCTX]),
949 secid: &secid);
950 if (ret_val != 0)
951 return ret_val;
952
953 return netlbl_unlhsh_add(net: &init_net,
954 NULL, addr, mask, addr_len, secid,
955 audit_info: &audit_info);
956}
957
958/**
959 * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
960 * @skb: the NETLINK buffer
961 * @info: the Generic NETLINK info block
962 *
963 * Description:
964 * Process a user generated STATICREMOVE message and remove the specified
965 * unlabeled connection entry. Returns zero on success, negative values on
966 * failure.
967 *
968 */
969static int netlbl_unlabel_staticremove(struct sk_buff *skb,
970 struct genl_info *info)
971{
972 int ret_val;
973 char *dev_name;
974 void *addr;
975 void *mask;
976 u32 addr_len;
977 struct netlbl_audit audit_info;
978
979 /* See the note in netlbl_unlabel_staticadd() about not allowing both
980 * IPv4 and IPv6 in the same entry. */
981 if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
982 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
983 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
984 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
985 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
986 return -EINVAL;
987
988 netlbl_netlink_auditinfo(audit_info: &audit_info);
989
990 ret_val = netlbl_unlabel_addrinfo_get(info, addr: &addr, mask: &mask, len: &addr_len);
991 if (ret_val != 0)
992 return ret_val;
993 dev_name = nla_data(nla: info->attrs[NLBL_UNLABEL_A_IFACE]);
994
995 return netlbl_unlhsh_remove(net: &init_net,
996 dev_name, addr, mask, addr_len,
997 audit_info: &audit_info);
998}
999
1000/**
1001 * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1002 * @skb: the NETLINK buffer
1003 * @info: the Generic NETLINK info block
1004 *
1005 * Description:
1006 * Process a user generated STATICREMOVEDEF message and remove the default
1007 * unlabeled connection entry. Returns zero on success, negative values on
1008 * failure.
1009 *
1010 */
1011static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1012 struct genl_info *info)
1013{
1014 int ret_val;
1015 void *addr;
1016 void *mask;
1017 u32 addr_len;
1018 struct netlbl_audit audit_info;
1019
1020 /* See the note in netlbl_unlabel_staticadd() about not allowing both
1021 * IPv4 and IPv6 in the same entry. */
1022 if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1023 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1024 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1025 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1026 return -EINVAL;
1027
1028 netlbl_netlink_auditinfo(audit_info: &audit_info);
1029
1030 ret_val = netlbl_unlabel_addrinfo_get(info, addr: &addr, mask: &mask, len: &addr_len);
1031 if (ret_val != 0)
1032 return ret_val;
1033
1034 return netlbl_unlhsh_remove(net: &init_net,
1035 NULL, addr, mask, addr_len,
1036 audit_info: &audit_info);
1037}
1038
1039
1040/**
1041 * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1042 * @cmd: command/message
1043 * @iface: the interface entry
1044 * @addr4: the IPv4 address entry
1045 * @addr6: the IPv6 address entry
1046 * @arg: the netlbl_unlhsh_walk_arg structure
1047 *
1048 * Description:
1049 * This function is designed to be used to generate a response for a
1050 * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6
1051 * can be specified, not both, the other unspecified entry should be set to
1052 * NULL by the caller. Returns the size of the message on success, negative
1053 * values on failure.
1054 *
1055 */
1056static int netlbl_unlabel_staticlist_gen(u32 cmd,
1057 const struct netlbl_unlhsh_iface *iface,
1058 const struct netlbl_unlhsh_addr4 *addr4,
1059 const struct netlbl_unlhsh_addr6 *addr6,
1060 void *arg)
1061{
1062 int ret_val = -ENOMEM;
1063 struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1064 struct net_device *dev;
1065 struct lsm_context ctx;
1066 void *data;
1067 u32 secid;
1068
1069 data = genlmsg_put(skb: cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
1070 seq: cb_arg->seq, family: &netlbl_unlabel_gnl_family,
1071 NLM_F_MULTI, cmd);
1072 if (data == NULL)
1073 goto list_cb_failure;
1074
1075 if (iface->ifindex > 0) {
1076 dev = dev_get_by_index(net: &init_net, ifindex: iface->ifindex);
1077 if (!dev) {
1078 ret_val = -ENODEV;
1079 goto list_cb_failure;
1080 }
1081 ret_val = nla_put_string(skb: cb_arg->skb,
1082 attrtype: NLBL_UNLABEL_A_IFACE, str: dev->name);
1083 dev_put(dev);
1084 if (ret_val != 0)
1085 goto list_cb_failure;
1086 }
1087
1088 if (addr4) {
1089 struct in_addr addr_struct;
1090
1091 addr_struct.s_addr = addr4->list.addr;
1092 ret_val = nla_put_in_addr(skb: cb_arg->skb,
1093 attrtype: NLBL_UNLABEL_A_IPV4ADDR,
1094 addr: addr_struct.s_addr);
1095 if (ret_val != 0)
1096 goto list_cb_failure;
1097
1098 addr_struct.s_addr = addr4->list.mask;
1099 ret_val = nla_put_in_addr(skb: cb_arg->skb,
1100 attrtype: NLBL_UNLABEL_A_IPV4MASK,
1101 addr: addr_struct.s_addr);
1102 if (ret_val != 0)
1103 goto list_cb_failure;
1104
1105 secid = addr4->secid;
1106 } else {
1107 ret_val = nla_put_in6_addr(skb: cb_arg->skb,
1108 attrtype: NLBL_UNLABEL_A_IPV6ADDR,
1109 addr: &addr6->list.addr);
1110 if (ret_val != 0)
1111 goto list_cb_failure;
1112
1113 ret_val = nla_put_in6_addr(skb: cb_arg->skb,
1114 attrtype: NLBL_UNLABEL_A_IPV6MASK,
1115 addr: &addr6->list.mask);
1116 if (ret_val != 0)
1117 goto list_cb_failure;
1118
1119 secid = addr6->secid;
1120 }
1121
1122 ret_val = security_secid_to_secctx(secid, cp: &ctx);
1123 if (ret_val < 0)
1124 goto list_cb_failure;
1125 ret_val = nla_put(skb: cb_arg->skb,
1126 attrtype: NLBL_UNLABEL_A_SECCTX,
1127 attrlen: ctx.len,
1128 data: ctx.context);
1129 security_release_secctx(cp: &ctx);
1130 if (ret_val != 0)
1131 goto list_cb_failure;
1132
1133 cb_arg->seq++;
1134 genlmsg_end(skb: cb_arg->skb, hdr: data);
1135 return 0;
1136
1137list_cb_failure:
1138 genlmsg_cancel(skb: cb_arg->skb, hdr: data);
1139 return ret_val;
1140}
1141
1142/**
1143 * netlbl_unlabel_staticlist - Handle a STATICLIST message
1144 * @skb: the NETLINK buffer
1145 * @cb: the NETLINK callback
1146 *
1147 * Description:
1148 * Process a user generated STATICLIST message and dump the unlabeled
1149 * connection hash table in a form suitable for use in a kernel generated
1150 * STATICLIST message. Returns the length of @skb.
1151 *
1152 */
1153static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1154 struct netlink_callback *cb)
1155{
1156 struct netlbl_unlhsh_walk_arg cb_arg;
1157 u32 skip_bkt = cb->args[0];
1158 u32 skip_chain = cb->args[1];
1159 u32 skip_addr4 = cb->args[2];
1160 u32 iter_bkt, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1161 struct netlbl_unlhsh_iface *iface;
1162 struct list_head *iter_list;
1163 struct netlbl_af4list *addr4;
1164#if IS_ENABLED(CONFIG_IPV6)
1165 u32 skip_addr6 = cb->args[3];
1166 struct netlbl_af6list *addr6;
1167#endif
1168
1169 cb_arg.nl_cb = cb;
1170 cb_arg.skb = skb;
1171 cb_arg.seq = cb->nlh->nlmsg_seq;
1172
1173 rcu_read_lock();
1174 for (iter_bkt = skip_bkt;
1175 iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1176 iter_bkt++) {
1177 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
1178 list_for_each_entry_rcu(iface, iter_list, list) {
1179 if (!iface->valid ||
1180 iter_chain++ < skip_chain)
1181 continue;
1182 netlbl_af4list_foreach_rcu(addr4,
1183 &iface->addr4_list) {
1184 if (iter_addr4++ < skip_addr4)
1185 continue;
1186 if (netlbl_unlabel_staticlist_gen(
1187 cmd: NLBL_UNLABEL_C_STATICLIST,
1188 iface,
1189 netlbl_unlhsh_addr4_entry(addr4),
1190 NULL,
1191 arg: &cb_arg) < 0) {
1192 iter_addr4--;
1193 iter_chain--;
1194 goto unlabel_staticlist_return;
1195 }
1196 }
1197 iter_addr4 = 0;
1198 skip_addr4 = 0;
1199#if IS_ENABLED(CONFIG_IPV6)
1200 netlbl_af6list_foreach_rcu(addr6,
1201 &iface->addr6_list) {
1202 if (iter_addr6++ < skip_addr6)
1203 continue;
1204 if (netlbl_unlabel_staticlist_gen(
1205 cmd: NLBL_UNLABEL_C_STATICLIST,
1206 iface,
1207 NULL,
1208 netlbl_unlhsh_addr6_entry(addr6),
1209 arg: &cb_arg) < 0) {
1210 iter_addr6--;
1211 iter_chain--;
1212 goto unlabel_staticlist_return;
1213 }
1214 }
1215 iter_addr6 = 0;
1216 skip_addr6 = 0;
1217#endif /* IPv6 */
1218 }
1219 iter_chain = 0;
1220 skip_chain = 0;
1221 }
1222
1223unlabel_staticlist_return:
1224 rcu_read_unlock();
1225 cb->args[0] = iter_bkt;
1226 cb->args[1] = iter_chain;
1227 cb->args[2] = iter_addr4;
1228 cb->args[3] = iter_addr6;
1229 return skb->len;
1230}
1231
1232/**
1233 * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1234 * @skb: the NETLINK buffer
1235 * @cb: the NETLINK callback
1236 *
1237 * Description:
1238 * Process a user generated STATICLISTDEF message and dump the default
1239 * unlabeled connection entry in a form suitable for use in a kernel generated
1240 * STATICLISTDEF message. Returns the length of @skb.
1241 *
1242 */
1243static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1244 struct netlink_callback *cb)
1245{
1246 struct netlbl_unlhsh_walk_arg cb_arg;
1247 struct netlbl_unlhsh_iface *iface;
1248 u32 iter_addr4 = 0, iter_addr6 = 0;
1249 struct netlbl_af4list *addr4;
1250#if IS_ENABLED(CONFIG_IPV6)
1251 struct netlbl_af6list *addr6;
1252#endif
1253
1254 cb_arg.nl_cb = cb;
1255 cb_arg.skb = skb;
1256 cb_arg.seq = cb->nlh->nlmsg_seq;
1257
1258 rcu_read_lock();
1259 iface = rcu_dereference(netlbl_unlhsh_def);
1260 if (iface == NULL || !iface->valid)
1261 goto unlabel_staticlistdef_return;
1262
1263 netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
1264 if (iter_addr4++ < cb->args[0])
1265 continue;
1266 if (netlbl_unlabel_staticlist_gen(cmd: NLBL_UNLABEL_C_STATICLISTDEF,
1267 iface,
1268 netlbl_unlhsh_addr4_entry(addr4),
1269 NULL,
1270 arg: &cb_arg) < 0) {
1271 iter_addr4--;
1272 goto unlabel_staticlistdef_return;
1273 }
1274 }
1275#if IS_ENABLED(CONFIG_IPV6)
1276 netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
1277 if (iter_addr6++ < cb->args[1])
1278 continue;
1279 if (netlbl_unlabel_staticlist_gen(cmd: NLBL_UNLABEL_C_STATICLISTDEF,
1280 iface,
1281 NULL,
1282 netlbl_unlhsh_addr6_entry(addr6),
1283 arg: &cb_arg) < 0) {
1284 iter_addr6--;
1285 goto unlabel_staticlistdef_return;
1286 }
1287 }
1288#endif /* IPv6 */
1289
1290unlabel_staticlistdef_return:
1291 rcu_read_unlock();
1292 cb->args[0] = iter_addr4;
1293 cb->args[1] = iter_addr6;
1294 return skb->len;
1295}
1296
1297/*
1298 * NetLabel Generic NETLINK Command Definitions
1299 */
1300
1301static const struct genl_small_ops netlbl_unlabel_genl_ops[] = {
1302 {
1303 .cmd = NLBL_UNLABEL_C_STATICADD,
1304 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1305 .flags = GENL_ADMIN_PERM,
1306 .doit = netlbl_unlabel_staticadd,
1307 .dumpit = NULL,
1308 },
1309 {
1310 .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1311 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1312 .flags = GENL_ADMIN_PERM,
1313 .doit = netlbl_unlabel_staticremove,
1314 .dumpit = NULL,
1315 },
1316 {
1317 .cmd = NLBL_UNLABEL_C_STATICLIST,
1318 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1319 .flags = 0,
1320 .doit = NULL,
1321 .dumpit = netlbl_unlabel_staticlist,
1322 },
1323 {
1324 .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1325 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1326 .flags = GENL_ADMIN_PERM,
1327 .doit = netlbl_unlabel_staticadddef,
1328 .dumpit = NULL,
1329 },
1330 {
1331 .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1332 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1333 .flags = GENL_ADMIN_PERM,
1334 .doit = netlbl_unlabel_staticremovedef,
1335 .dumpit = NULL,
1336 },
1337 {
1338 .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1339 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1340 .flags = 0,
1341 .doit = NULL,
1342 .dumpit = netlbl_unlabel_staticlistdef,
1343 },
1344 {
1345 .cmd = NLBL_UNLABEL_C_ACCEPT,
1346 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1347 .flags = GENL_ADMIN_PERM,
1348 .doit = netlbl_unlabel_accept,
1349 .dumpit = NULL,
1350 },
1351 {
1352 .cmd = NLBL_UNLABEL_C_LIST,
1353 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1354 .flags = 0,
1355 .doit = netlbl_unlabel_list,
1356 .dumpit = NULL,
1357 },
1358};
1359
1360static struct genl_family netlbl_unlabel_gnl_family __ro_after_init = {
1361 .hdrsize = 0,
1362 .name = NETLBL_NLTYPE_UNLABELED_NAME,
1363 .version = NETLBL_PROTO_VERSION,
1364 .maxattr = NLBL_UNLABEL_A_MAX,
1365 .policy = netlbl_unlabel_genl_policy,
1366 .module = THIS_MODULE,
1367 .small_ops = netlbl_unlabel_genl_ops,
1368 .n_small_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops),
1369 .resv_start_op = NLBL_UNLABEL_C_STATICLISTDEF + 1,
1370};
1371
1372/*
1373 * NetLabel Generic NETLINK Protocol Functions
1374 */
1375
1376/**
1377 * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
1378 *
1379 * Description:
1380 * Register the unlabeled packet NetLabel component with the Generic NETLINK
1381 * mechanism. Returns zero on success, negative values on failure.
1382 *
1383 */
1384int __init netlbl_unlabel_genl_init(void)
1385{
1386 return genl_register_family(family: &netlbl_unlabel_gnl_family);
1387}
1388
1389/*
1390 * NetLabel KAPI Hooks
1391 */
1392
1393static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1394 .notifier_call = netlbl_unlhsh_netdev_handler,
1395};
1396
1397/**
1398 * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1399 * @size: the number of bits to use for the hash buckets
1400 *
1401 * Description:
1402 * Initializes the unlabeled connection hash table and registers a network
1403 * device notification handler. This function should only be called by the
1404 * NetLabel subsystem itself during initialization. Returns zero on success,
1405 * non-zero values on error.
1406 *
1407 */
1408int __init netlbl_unlabel_init(u32 size)
1409{
1410 u32 iter;
1411 struct netlbl_unlhsh_tbl *hsh_tbl;
1412
1413 if (size == 0)
1414 return -EINVAL;
1415
1416 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1417 if (hsh_tbl == NULL)
1418 return -ENOMEM;
1419 hsh_tbl->size = 1 << size;
1420 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1421 sizeof(struct list_head),
1422 GFP_KERNEL);
1423 if (hsh_tbl->tbl == NULL) {
1424 kfree(objp: hsh_tbl);
1425 return -ENOMEM;
1426 }
1427 for (iter = 0; iter < hsh_tbl->size; iter++)
1428 INIT_LIST_HEAD(list: &hsh_tbl->tbl[iter]);
1429
1430 spin_lock(lock: &netlbl_unlhsh_lock);
1431 rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1432 spin_unlock(lock: &netlbl_unlhsh_lock);
1433
1434 register_netdevice_notifier(nb: &netlbl_unlhsh_netdev_notifier);
1435
1436 return 0;
1437}
1438
1439/**
1440 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1441 * @skb: the packet
1442 * @family: protocol family
1443 * @secattr: the security attributes
1444 *
1445 * Description:
1446 * Determine the security attributes, if any, for an unlabled packet and return
1447 * them in @secattr. Returns zero on success and negative values on failure.
1448 *
1449 */
1450int netlbl_unlabel_getattr(const struct sk_buff *skb,
1451 u16 family,
1452 struct netlbl_lsm_secattr *secattr)
1453{
1454 struct netlbl_unlhsh_iface *iface;
1455
1456 rcu_read_lock();
1457 iface = netlbl_unlhsh_search_iface(ifindex: skb->skb_iif);
1458 if (iface == NULL)
1459 iface = rcu_dereference(netlbl_unlhsh_def);
1460 if (iface == NULL || !iface->valid)
1461 goto unlabel_getattr_nolabel;
1462
1463#if IS_ENABLED(CONFIG_IPV6)
1464 /* When resolving a fallback label, check the sk_buff version as
1465 * it is possible (e.g. SCTP) to have family = PF_INET6 while
1466 * receiving ip_hdr(skb)->version = 4.
1467 */
1468 if (family == PF_INET6 && ip_hdr(skb)->version == 4)
1469 family = PF_INET;
1470#endif /* IPv6 */
1471
1472 switch (family) {
1473 case PF_INET: {
1474 struct iphdr *hdr4;
1475 struct netlbl_af4list *addr4;
1476
1477 hdr4 = ip_hdr(skb);
1478 addr4 = netlbl_af4list_search(addr: hdr4->saddr,
1479 head: &iface->addr4_list);
1480 if (addr4 == NULL)
1481 goto unlabel_getattr_nolabel;
1482 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
1483 break;
1484 }
1485#if IS_ENABLED(CONFIG_IPV6)
1486 case PF_INET6: {
1487 struct ipv6hdr *hdr6;
1488 struct netlbl_af6list *addr6;
1489
1490 hdr6 = ipv6_hdr(skb);
1491 addr6 = netlbl_af6list_search(addr: &hdr6->saddr,
1492 head: &iface->addr6_list);
1493 if (addr6 == NULL)
1494 goto unlabel_getattr_nolabel;
1495 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
1496 break;
1497 }
1498#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();
1510 if (netlabel_unlabel_acceptflg == 0)
1511 return -ENOMSG;
1512 secattr->type = NETLBL_NLTYPE_UNLABELED;
1513 return 0;
1514}
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 */
1524int __init netlbl_unlabel_defconf(void)
1525{
1526 int ret_val;
1527 struct netlbl_dom_map *entry;
1528 struct netlbl_audit audit_info;
1529
1530 /* 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_current_getlsmprop_subj(prop: &audit_info.prop);
1534 audit_info.loginuid = GLOBAL_ROOT_UID;
1535 audit_info.sessionid = 0;
1536
1537 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1538 if (entry == NULL)
1539 return -ENOMEM;
1540 entry->family = AF_UNSPEC;
1541 entry->def.type = NETLBL_NLTYPE_UNLABELED;
1542 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
1543 if (ret_val != 0)
1544 return ret_val;
1545
1546 netlbl_unlabel_acceptflg_set(1, &audit_info);
1547
1548 return 0;
1549}
1550