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-rw-r--r--net/netlabel/netlabel_unlabeled.c1565
1 files changed, 1546 insertions, 19 deletions
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 348292450deb..42e81fd8cc49 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -10,7 +10,7 @@
10 */ 10 */
11 11
12/* 12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2007
14 * 14 *
15 * This program is free software; you can redistribute it and/or modify 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 16 * it under the terms of the GNU General Public License as published by
@@ -36,22 +36,92 @@
36#include <linux/string.h> 36#include <linux/string.h>
37#include <linux/skbuff.h> 37#include <linux/skbuff.h>
38#include <linux/audit.h> 38#include <linux/audit.h>
39#include <linux/in.h>
40#include <linux/in6.h>
41#include <linux/ip.h>
42#include <linux/ipv6.h>
43#include <linux/notifier.h>
44#include <linux/netdevice.h>
45#include <linux/security.h>
39#include <net/sock.h> 46#include <net/sock.h>
40#include <net/netlink.h> 47#include <net/netlink.h>
41#include <net/genetlink.h> 48#include <net/genetlink.h>
42 49#include <net/ip.h>
50#include <net/ipv6.h>
51#include <net/net_namespace.h>
43#include <net/netlabel.h> 52#include <net/netlabel.h>
44#include <asm/bug.h> 53#include <asm/bug.h>
54#include <asm/atomic.h>
45 55
46#include "netlabel_user.h" 56#include "netlabel_user.h"
47#include "netlabel_domainhash.h" 57#include "netlabel_domainhash.h"
48#include "netlabel_unlabeled.h" 58#include "netlabel_unlabeled.h"
59#include "netlabel_mgmt.h"
60
61/* NOTE: at present we always use init's network namespace since we don't
62 * presently support different namespaces even though the majority of
63 * the functions in this file are "namespace safe" */
64
65/* The unlabeled connection hash table which we use to map network interfaces
66 * and addresses of unlabeled packets to a user specified secid value for the
67 * LSM. The hash table is used to lookup the network interface entry
68 * (struct netlbl_unlhsh_iface) and then the interface entry is used to
69 * lookup an IP address match from an ordered list. If a network interface
70 * match can not be found in the hash table then the default entry
71 * (netlbl_unlhsh_def) is used. The IP address entry list
72 * (struct netlbl_unlhsh_addr) is ordered such that the entries with a
73 * larger netmask come first.
74 */
75struct netlbl_unlhsh_tbl {
76 struct list_head *tbl;
77 u32 size;
78};
79struct netlbl_unlhsh_addr4 {
80 __be32 addr;
81 __be32 mask;
82 u32 secid;
83
84 u32 valid;
85 struct list_head list;
86 struct rcu_head rcu;
87};
88struct netlbl_unlhsh_addr6 {
89 struct in6_addr addr;
90 struct in6_addr mask;
91 u32 secid;
92
93 u32 valid;
94 struct list_head list;
95 struct rcu_head rcu;
96};
97struct netlbl_unlhsh_iface {
98 int ifindex;
99 struct list_head addr4_list;
100 struct list_head addr6_list;
101
102 u32 valid;
103 struct list_head list;
104 struct rcu_head rcu;
105};
106
107/* Argument struct for netlbl_unlhsh_walk() */
108struct netlbl_unlhsh_walk_arg {
109 struct netlink_callback *nl_cb;
110 struct sk_buff *skb;
111 u32 seq;
112};
113
114/* Unlabeled connection hash table */
115/* updates should be so rare that having one spinlock for the entire
116 * hash table should be okay */
117static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
118static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
119static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
49 120
50/* Accept unlabeled packets flag */ 121/* Accept unlabeled packets flag */
51static DEFINE_SPINLOCK(netlabel_unlabel_acceptflg_lock);
52static u8 netlabel_unlabel_acceptflg = 0; 122static u8 netlabel_unlabel_acceptflg = 0;
53 123
54/* NetLabel Generic NETLINK CIPSOv4 family */ 124/* NetLabel Generic NETLINK unlabeled family */
55static struct genl_family netlbl_unlabel_gnl_family = { 125static struct genl_family netlbl_unlabel_gnl_family = {
56 .id = GENL_ID_GENERATE, 126 .id = GENL_ID_GENERATE,
57 .hdrsize = 0, 127 .hdrsize = 0,
@@ -63,11 +133,841 @@ static struct genl_family netlbl_unlabel_gnl_family = {
63/* NetLabel Netlink attribute policy */ 133/* NetLabel Netlink attribute policy */
64static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { 134static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
65 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, 135 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
136 [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
137 .len = sizeof(struct in6_addr) },
138 [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
139 .len = sizeof(struct in6_addr) },
140 [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
141 .len = sizeof(struct in_addr) },
142 [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
143 .len = sizeof(struct in_addr) },
144 [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
145 .len = IFNAMSIZ - 1 },
146 [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
66}; 147};
67 148
68/* 149/*
69 * Helper Functions 150 * Audit Helper Functions
151 */
152
153/**
154 * netlbl_unlabel_audit_addr4 - Audit an IPv4 address
155 * @audit_buf: audit buffer
156 * @dev: network interface
157 * @addr: IP address
158 * @mask: IP address mask
159 *
160 * Description:
161 * Write the IPv4 address and address mask, if necessary, to @audit_buf.
162 *
163 */
164static void netlbl_unlabel_audit_addr4(struct audit_buffer *audit_buf,
165 const char *dev,
166 __be32 addr, __be32 mask)
167{
168 u32 mask_val = ntohl(mask);
169
170 if (dev != NULL)
171 audit_log_format(audit_buf, " netif=%s", dev);
172 audit_log_format(audit_buf, " src=" NIPQUAD_FMT, NIPQUAD(addr));
173 if (mask_val != 0xffffffff) {
174 u32 mask_len = 0;
175 while (mask_val > 0) {
176 mask_val <<= 1;
177 mask_len++;
178 }
179 audit_log_format(audit_buf, " src_prefixlen=%d", mask_len);
180 }
181}
182
183/**
184 * netlbl_unlabel_audit_addr6 - Audit an IPv6 address
185 * @audit_buf: audit buffer
186 * @dev: network interface
187 * @addr: IP address
188 * @mask: IP address mask
189 *
190 * Description:
191 * Write the IPv6 address and address mask, if necessary, to @audit_buf.
192 *
193 */
194static void netlbl_unlabel_audit_addr6(struct audit_buffer *audit_buf,
195 const char *dev,
196 const struct in6_addr *addr,
197 const struct in6_addr *mask)
198{
199 if (dev != NULL)
200 audit_log_format(audit_buf, " netif=%s", dev);
201 audit_log_format(audit_buf, " src=" NIP6_FMT, NIP6(*addr));
202 if (ntohl(mask->s6_addr32[3]) != 0xffffffff) {
203 u32 mask_len = 0;
204 u32 mask_val;
205 int iter = -1;
206 while (ntohl(mask->s6_addr32[++iter]) == 0xffffffff)
207 mask_len += 32;
208 mask_val = ntohl(mask->s6_addr32[iter]);
209 while (mask_val > 0) {
210 mask_val <<= 1;
211 mask_len++;
212 }
213 audit_log_format(audit_buf, " src_prefixlen=%d", mask_len);
214 }
215}
216
217/*
218 * Unlabeled Connection Hash Table Functions
219 */
220
221/**
222 * netlbl_unlhsh_free_addr4 - Frees an IPv4 address entry from the hash table
223 * @entry: the entry's RCU field
224 *
225 * Description:
226 * This function is designed to be used as a callback to the call_rcu()
227 * function so that memory allocated to a hash table address entry can be
228 * released safely.
229 *
230 */
231static void netlbl_unlhsh_free_addr4(struct rcu_head *entry)
232{
233 struct netlbl_unlhsh_addr4 *ptr;
234
235 ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu);
236 kfree(ptr);
237}
238
239#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
240/**
241 * netlbl_unlhsh_free_addr6 - Frees an IPv6 address entry from the hash table
242 * @entry: the entry's RCU field
243 *
244 * Description:
245 * This function is designed to be used as a callback to the call_rcu()
246 * function so that memory allocated to a hash table address entry can be
247 * released safely.
248 *
249 */
250static void netlbl_unlhsh_free_addr6(struct rcu_head *entry)
251{
252 struct netlbl_unlhsh_addr6 *ptr;
253
254 ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu);
255 kfree(ptr);
256}
257#endif /* IPv6 */
258
259/**
260 * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
261 * @entry: the entry's RCU field
262 *
263 * Description:
264 * This function is designed to be used as a callback to the call_rcu()
265 * function so that memory allocated to a hash table interface entry can be
266 * released safely. It is important to note that this function does not free
267 * the IPv4 and IPv6 address lists contained as part of an interface entry. It
268 * is up to the rest of the code to make sure an interface entry is only freed
269 * once it's address lists are empty.
270 *
271 */
272static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
273{
274 struct netlbl_unlhsh_iface *iface;
275 struct netlbl_unlhsh_addr4 *iter4;
276 struct netlbl_unlhsh_addr4 *tmp4;
277 struct netlbl_unlhsh_addr6 *iter6;
278 struct netlbl_unlhsh_addr6 *tmp6;
279
280 iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
281
282 /* no need for locks here since we are the only one with access to this
283 * structure */
284
285 list_for_each_entry_safe(iter4, tmp4, &iface->addr4_list, list)
286 if (iter4->valid) {
287 list_del_rcu(&iter4->list);
288 kfree(iter4);
289 }
290 list_for_each_entry_safe(iter6, tmp6, &iface->addr6_list, list)
291 if (iter6->valid) {
292 list_del_rcu(&iter6->list);
293 kfree(iter6);
294 }
295 kfree(iface);
296}
297
298/**
299 * netlbl_unlhsh_hash - Hashing function for the hash table
300 * @ifindex: the network interface/device to hash
301 *
302 * Description:
303 * This is the hashing function for the unlabeled hash table, it returns the
304 * bucket number for the given device/interface. The caller is responsible for
305 * calling the rcu_read_[un]lock() functions.
306 *
70 */ 307 */
308static u32 netlbl_unlhsh_hash(int ifindex)
309{
310 /* this is taken _almost_ directly from
311 * security/selinux/netif.c:sel_netif_hasfn() as they do pretty much
312 * the same thing */
313 return ifindex & (rcu_dereference(netlbl_unlhsh)->size - 1);
314}
315
316/**
317 * netlbl_unlhsh_search_addr4 - Search for a matching IPv4 address entry
318 * @addr: IPv4 address
319 * @iface: the network interface entry
320 *
321 * Description:
322 * Searches the IPv4 address list of the network interface specified by @iface.
323 * If a matching address entry is found it is returned, otherwise NULL is
324 * returned. The caller is responsible for calling the rcu_read_[un]lock()
325 * functions.
326 *
327 */
328static struct netlbl_unlhsh_addr4 *netlbl_unlhsh_search_addr4(
329 __be32 addr,
330 const struct netlbl_unlhsh_iface *iface)
331{
332 struct netlbl_unlhsh_addr4 *iter;
333
334 list_for_each_entry_rcu(iter, &iface->addr4_list, list)
335 if (iter->valid && (addr & iter->mask) == iter->addr)
336 return iter;
337
338 return NULL;
339}
340
341#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
342/**
343 * netlbl_unlhsh_search_addr6 - Search for a matching IPv6 address entry
344 * @addr: IPv6 address
345 * @iface: the network interface entry
346 *
347 * Description:
348 * Searches the IPv6 address list of the network interface specified by @iface.
349 * If a matching address entry is found it is returned, otherwise NULL is
350 * returned. The caller is responsible for calling the rcu_read_[un]lock()
351 * functions.
352 *
353 */
354static struct netlbl_unlhsh_addr6 *netlbl_unlhsh_search_addr6(
355 const struct in6_addr *addr,
356 const struct netlbl_unlhsh_iface *iface)
357{
358 struct netlbl_unlhsh_addr6 *iter;
359
360 list_for_each_entry_rcu(iter, &iface->addr6_list, list)
361 if (iter->valid &&
362 ipv6_masked_addr_cmp(&iter->addr, &iter->mask, addr) == 0)
363 return iter;
364
365 return NULL;
366}
367#endif /* IPv6 */
368
369/**
370 * netlbl_unlhsh_search_iface - Search for a matching interface entry
371 * @ifindex: the network interface
372 *
373 * Description:
374 * Searches the unlabeled connection hash table and returns a pointer to the
375 * interface entry which matches @ifindex, otherwise NULL is returned. The
376 * caller is responsible for calling the rcu_read_[un]lock() functions.
377 *
378 */
379static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
380{
381 u32 bkt;
382 struct netlbl_unlhsh_iface *iter;
383
384 bkt = netlbl_unlhsh_hash(ifindex);
385 list_for_each_entry_rcu(iter,
386 &rcu_dereference(netlbl_unlhsh)->tbl[bkt],
387 list)
388 if (iter->valid && iter->ifindex == ifindex)
389 return iter;
390
391 return NULL;
392}
393
394/**
395 * netlbl_unlhsh_search_iface_def - Search for a matching interface entry
396 * @ifindex: the network interface
397 *
398 * Description:
399 * Searches the unlabeled connection hash table and returns a pointer to the
400 * interface entry which matches @ifindex. If an exact match can not be found
401 * and there is a valid default entry, the default entry is returned, otherwise
402 * NULL is returned. The caller is responsible for calling the
403 * rcu_read_[un]lock() functions.
404 *
405 */
406static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface_def(int ifindex)
407{
408 struct netlbl_unlhsh_iface *entry;
409
410 entry = netlbl_unlhsh_search_iface(ifindex);
411 if (entry != NULL)
412 return entry;
413
414 entry = rcu_dereference(netlbl_unlhsh_def);
415 if (entry != NULL && entry->valid)
416 return entry;
417
418 return NULL;
419}
420
421/**
422 * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
423 * @iface: the associated interface entry
424 * @addr: IPv4 address in network byte order
425 * @mask: IPv4 address mask in network byte order
426 * @secid: LSM secid value for entry
427 *
428 * Description:
429 * Add a new address entry into the unlabeled connection hash table using the
430 * interface entry specified by @iface. On success zero is returned, otherwise
431 * a negative value is returned. The caller is responsible for calling the
432 * rcu_read_[un]lock() functions.
433 *
434 */
435static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
436 const struct in_addr *addr,
437 const struct in_addr *mask,
438 u32 secid)
439{
440 struct netlbl_unlhsh_addr4 *entry;
441 struct netlbl_unlhsh_addr4 *iter;
442
443 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
444 if (entry == NULL)
445 return -ENOMEM;
446
447 entry->addr = addr->s_addr & mask->s_addr;
448 entry->mask = mask->s_addr;
449 entry->secid = secid;
450 entry->valid = 1;
451 INIT_RCU_HEAD(&entry->rcu);
452
453 spin_lock(&netlbl_unlhsh_lock);
454 iter = netlbl_unlhsh_search_addr4(entry->addr, iface);
455 if (iter != NULL &&
456 iter->addr == addr->s_addr && iter->mask == mask->s_addr) {
457 spin_unlock(&netlbl_unlhsh_lock);
458 kfree(entry);
459 return -EEXIST;
460 }
461 /* in order to speed up address searches through the list (the common
462 * case) we need to keep the list in order based on the size of the
463 * address mask such that the entry with the widest mask (smallest
464 * numerical value) appears first in the list */
465 list_for_each_entry_rcu(iter, &iface->addr4_list, list)
466 if (iter->valid &&
467 ntohl(entry->mask) > ntohl(iter->mask)) {
468 __list_add_rcu(&entry->list,
469 iter->list.prev,
470 &iter->list);
471 spin_unlock(&netlbl_unlhsh_lock);
472 return 0;
473 }
474 list_add_tail_rcu(&entry->list, &iface->addr4_list);
475 spin_unlock(&netlbl_unlhsh_lock);
476 return 0;
477}
478
479#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
480/**
481 * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
482 * @iface: the associated interface entry
483 * @addr: IPv6 address in network byte order
484 * @mask: IPv6 address mask in network byte order
485 * @secid: LSM secid value for entry
486 *
487 * Description:
488 * Add a new address entry into the unlabeled connection hash table using the
489 * interface entry specified by @iface. On success zero is returned, otherwise
490 * a negative value is returned. The caller is responsible for calling the
491 * rcu_read_[un]lock() functions.
492 *
493 */
494static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
495 const struct in6_addr *addr,
496 const struct in6_addr *mask,
497 u32 secid)
498{
499 struct netlbl_unlhsh_addr6 *entry;
500 struct netlbl_unlhsh_addr6 *iter;
501
502 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
503 if (entry == NULL)
504 return -ENOMEM;
505
506 ipv6_addr_copy(&entry->addr, addr);
507 entry->addr.s6_addr32[0] &= mask->s6_addr32[0];
508 entry->addr.s6_addr32[1] &= mask->s6_addr32[1];
509 entry->addr.s6_addr32[2] &= mask->s6_addr32[2];
510 entry->addr.s6_addr32[3] &= mask->s6_addr32[3];
511 ipv6_addr_copy(&entry->mask, mask);
512 entry->secid = secid;
513 entry->valid = 1;
514 INIT_RCU_HEAD(&entry->rcu);
515
516 spin_lock(&netlbl_unlhsh_lock);
517 iter = netlbl_unlhsh_search_addr6(&entry->addr, iface);
518 if (iter != NULL &&
519 (ipv6_addr_equal(&iter->addr, addr) &&
520 ipv6_addr_equal(&iter->mask, mask))) {
521 spin_unlock(&netlbl_unlhsh_lock);
522 kfree(entry);
523 return -EEXIST;
524 }
525 /* in order to speed up address searches through the list (the common
526 * case) we need to keep the list in order based on the size of the
527 * address mask such that the entry with the widest mask (smallest
528 * numerical value) appears first in the list */
529 list_for_each_entry_rcu(iter, &iface->addr6_list, list)
530 if (iter->valid &&
531 ipv6_addr_cmp(&entry->mask, &iter->mask) > 0) {
532 __list_add_rcu(&entry->list,
533 iter->list.prev,
534 &iter->list);
535 spin_unlock(&netlbl_unlhsh_lock);
536 return 0;
537 }
538 list_add_tail_rcu(&entry->list, &iface->addr6_list);
539 spin_unlock(&netlbl_unlhsh_lock);
540 return 0;
541}
542#endif /* IPv6 */
543
544/**
545 * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
546 * @ifindex: network interface
547 *
548 * Description:
549 * Add a new, empty, interface entry into the unlabeled connection hash table.
550 * On success a pointer to the new interface entry is returned, on failure NULL
551 * is returned. The caller is responsible for calling the rcu_read_[un]lock()
552 * functions.
553 *
554 */
555static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
556{
557 u32 bkt;
558 struct netlbl_unlhsh_iface *iface;
559
560 iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
561 if (iface == NULL)
562 return NULL;
563
564 iface->ifindex = ifindex;
565 INIT_LIST_HEAD(&iface->addr4_list);
566 INIT_LIST_HEAD(&iface->addr6_list);
567 iface->valid = 1;
568 INIT_RCU_HEAD(&iface->rcu);
569
570 spin_lock(&netlbl_unlhsh_lock);
571 if (ifindex > 0) {
572 bkt = netlbl_unlhsh_hash(ifindex);
573 if (netlbl_unlhsh_search_iface(ifindex) != NULL)
574 goto add_iface_failure;
575 list_add_tail_rcu(&iface->list,
576 &rcu_dereference(netlbl_unlhsh)->tbl[bkt]);
577 } else {
578 INIT_LIST_HEAD(&iface->list);
579 if (rcu_dereference(netlbl_unlhsh_def) != NULL)
580 goto add_iface_failure;
581 rcu_assign_pointer(netlbl_unlhsh_def, iface);
582 }
583 spin_unlock(&netlbl_unlhsh_lock);
584
585 return iface;
586
587add_iface_failure:
588 spin_unlock(&netlbl_unlhsh_lock);
589 kfree(iface);
590 return NULL;
591}
592
593/**
594 * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
595 * @net: network namespace
596 * @dev_name: interface name
597 * @addr: IP address in network byte order
598 * @mask: address mask in network byte order
599 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
600 * @secid: LSM secid value for the entry
601 * @audit_info: NetLabel audit information
602 *
603 * Description:
604 * Adds a new entry to the unlabeled connection hash table. Returns zero on
605 * success, negative values on failure.
606 *
607 */
608static int netlbl_unlhsh_add(struct net *net,
609 const char *dev_name,
610 const void *addr,
611 const void *mask,
612 u32 addr_len,
613 u32 secid,
614 struct netlbl_audit *audit_info)
615{
616 int ret_val;
617 int ifindex;
618 struct net_device *dev;
619 struct netlbl_unlhsh_iface *iface;
620 struct in_addr *addr4, *mask4;
621 struct in6_addr *addr6, *mask6;
622 struct audit_buffer *audit_buf = NULL;
623 char *secctx = NULL;
624 u32 secctx_len;
625
626 if (addr_len != sizeof(struct in_addr) &&
627 addr_len != sizeof(struct in6_addr))
628 return -EINVAL;
629
630 rcu_read_lock();
631 if (dev_name != NULL) {
632 dev = dev_get_by_name(net, dev_name);
633 if (dev == NULL) {
634 ret_val = -ENODEV;
635 goto unlhsh_add_return;
636 }
637 ifindex = dev->ifindex;
638 dev_put(dev);
639 iface = netlbl_unlhsh_search_iface(ifindex);
640 } else {
641 ifindex = 0;
642 iface = rcu_dereference(netlbl_unlhsh_def);
643 }
644 if (iface == NULL) {
645 iface = netlbl_unlhsh_add_iface(ifindex);
646 if (iface == NULL) {
647 ret_val = -ENOMEM;
648 goto unlhsh_add_return;
649 }
650 }
651 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
652 audit_info);
653 switch (addr_len) {
654 case sizeof(struct in_addr):
655 addr4 = (struct in_addr *)addr;
656 mask4 = (struct in_addr *)mask;
657 ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
658 if (audit_buf != NULL)
659 netlbl_unlabel_audit_addr4(audit_buf,
660 dev_name,
661 addr4->s_addr,
662 mask4->s_addr);
663 break;
664#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
665 case sizeof(struct in6_addr):
666 addr6 = (struct in6_addr *)addr;
667 mask6 = (struct in6_addr *)mask;
668 ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
669 if (audit_buf != NULL)
670 netlbl_unlabel_audit_addr6(audit_buf,
671 dev_name,
672 addr6, mask6);
673 break;
674#endif /* IPv6 */
675 default:
676 ret_val = -EINVAL;
677 }
678 if (ret_val == 0)
679 atomic_inc(&netlabel_mgmt_protocount);
680
681unlhsh_add_return:
682 rcu_read_unlock();
683 if (audit_buf != NULL) {
684 if (security_secid_to_secctx(secid,
685 &secctx,
686 &secctx_len) == 0) {
687 audit_log_format(audit_buf, " sec_obj=%s", secctx);
688 security_release_secctx(secctx, secctx_len);
689 }
690 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
691 audit_log_end(audit_buf);
692 }
693 return ret_val;
694}
695
696/**
697 * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
698 * @net: network namespace
699 * @iface: interface entry
700 * @addr: IP address
701 * @mask: IP address mask
702 * @audit_info: NetLabel audit information
703 *
704 * Description:
705 * Remove an IP address entry from the unlabeled connection hash table.
706 * Returns zero on success, negative values on failure. The caller is
707 * responsible for calling the rcu_read_[un]lock() functions.
708 *
709 */
710static int netlbl_unlhsh_remove_addr4(struct net *net,
711 struct netlbl_unlhsh_iface *iface,
712 const struct in_addr *addr,
713 const struct in_addr *mask,
714 struct netlbl_audit *audit_info)
715{
716 int ret_val = -ENOENT;
717 struct netlbl_unlhsh_addr4 *entry;
718 struct audit_buffer *audit_buf = NULL;
719 struct net_device *dev;
720 char *secctx = NULL;
721 u32 secctx_len;
722
723 spin_lock(&netlbl_unlhsh_lock);
724 entry = netlbl_unlhsh_search_addr4(addr->s_addr, iface);
725 if (entry != NULL &&
726 entry->addr == addr->s_addr && entry->mask == mask->s_addr) {
727 entry->valid = 0;
728 list_del_rcu(&entry->list);
729 ret_val = 0;
730 }
731 spin_unlock(&netlbl_unlhsh_lock);
732
733 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
734 audit_info);
735 if (audit_buf != NULL) {
736 dev = dev_get_by_index(net, iface->ifindex);
737 netlbl_unlabel_audit_addr4(audit_buf,
738 (dev != NULL ? dev->name : NULL),
739 entry->addr, entry->mask);
740 if (dev != NULL)
741 dev_put(dev);
742 if (security_secid_to_secctx(entry->secid,
743 &secctx,
744 &secctx_len) == 0) {
745 audit_log_format(audit_buf, " sec_obj=%s", secctx);
746 security_release_secctx(secctx, secctx_len);
747 }
748 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
749 audit_log_end(audit_buf);
750 }
751
752 if (ret_val == 0)
753 call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
754 return ret_val;
755}
756
757#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
758/**
759 * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
760 * @net: network namespace
761 * @iface: interface entry
762 * @addr: IP address
763 * @mask: IP address mask
764 * @audit_info: NetLabel audit information
765 *
766 * Description:
767 * Remove an IP address entry from the unlabeled connection hash table.
768 * Returns zero on success, negative values on failure. The caller is
769 * responsible for calling the rcu_read_[un]lock() functions.
770 *
771 */
772static int netlbl_unlhsh_remove_addr6(struct net *net,
773 struct netlbl_unlhsh_iface *iface,
774 const struct in6_addr *addr,
775 const struct in6_addr *mask,
776 struct netlbl_audit *audit_info)
777{
778 int ret_val = -ENOENT;
779 struct netlbl_unlhsh_addr6 *entry;
780 struct audit_buffer *audit_buf = NULL;
781 struct net_device *dev;
782 char *secctx = NULL;
783 u32 secctx_len;
784
785 spin_lock(&netlbl_unlhsh_lock);
786 entry = netlbl_unlhsh_search_addr6(addr, iface);
787 if (entry != NULL &&
788 (ipv6_addr_equal(&entry->addr, addr) &&
789 ipv6_addr_equal(&entry->mask, mask))) {
790 entry->valid = 0;
791 list_del_rcu(&entry->list);
792 ret_val = 0;
793 }
794 spin_unlock(&netlbl_unlhsh_lock);
795
796 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
797 audit_info);
798 if (audit_buf != NULL) {
799 dev = dev_get_by_index(net, iface->ifindex);
800 netlbl_unlabel_audit_addr6(audit_buf,
801 (dev != NULL ? dev->name : NULL),
802 addr, mask);
803 if (dev != NULL)
804 dev_put(dev);
805 if (security_secid_to_secctx(entry->secid,
806 &secctx,
807 &secctx_len) == 0) {
808 audit_log_format(audit_buf, " sec_obj=%s", secctx);
809 security_release_secctx(secctx, secctx_len);
810 }
811 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
812 audit_log_end(audit_buf);
813 }
814
815 if (ret_val == 0)
816 call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
817 return ret_val;
818}
819#endif /* IPv6 */
820
821/**
822 * netlbl_unlhsh_condremove_iface - Remove an interface entry
823 * @iface: the interface entry
824 *
825 * Description:
826 * Remove an interface entry from the unlabeled connection hash table if it is
827 * empty. An interface entry is considered to be empty if there are no
828 * address entries assigned to it.
829 *
830 */
831static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
832{
833 struct netlbl_unlhsh_addr4 *iter4;
834 struct netlbl_unlhsh_addr6 *iter6;
835
836 spin_lock(&netlbl_unlhsh_lock);
837 list_for_each_entry_rcu(iter4, &iface->addr4_list, list)
838 if (iter4->valid)
839 goto unlhsh_condremove_failure;
840 list_for_each_entry_rcu(iter6, &iface->addr6_list, list)
841 if (iter6->valid)
842 goto unlhsh_condremove_failure;
843 iface->valid = 0;
844 if (iface->ifindex > 0)
845 list_del_rcu(&iface->list);
846 else
847 rcu_assign_pointer(netlbl_unlhsh_def, NULL);
848 spin_unlock(&netlbl_unlhsh_lock);
849
850 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
851 return;
852
853unlhsh_condremove_failure:
854 spin_unlock(&netlbl_unlhsh_lock);
855 return;
856}
857
858/**
859 * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
860 * @net: network namespace
861 * @dev_name: interface name
862 * @addr: IP address in network byte order
863 * @mask: address mask in network byte order
864 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
865 * @audit_info: NetLabel audit information
866 *
867 * Description:
868 * Removes and existing entry from the unlabeled connection hash table.
869 * Returns zero on success, negative values on failure.
870 *
871 */
872static int netlbl_unlhsh_remove(struct net *net,
873 const char *dev_name,
874 const void *addr,
875 const void *mask,
876 u32 addr_len,
877 struct netlbl_audit *audit_info)
878{
879 int ret_val;
880 struct net_device *dev;
881 struct netlbl_unlhsh_iface *iface;
882
883 if (addr_len != sizeof(struct in_addr) &&
884 addr_len != sizeof(struct in6_addr))
885 return -EINVAL;
886
887 rcu_read_lock();
888 if (dev_name != NULL) {
889 dev = dev_get_by_name(net, dev_name);
890 if (dev == NULL) {
891 ret_val = -ENODEV;
892 goto unlhsh_remove_return;
893 }
894 iface = netlbl_unlhsh_search_iface(dev->ifindex);
895 dev_put(dev);
896 } else
897 iface = rcu_dereference(netlbl_unlhsh_def);
898 if (iface == NULL) {
899 ret_val = -ENOENT;
900 goto unlhsh_remove_return;
901 }
902 switch (addr_len) {
903 case sizeof(struct in_addr):
904 ret_val = netlbl_unlhsh_remove_addr4(net,
905 iface, addr, mask,
906 audit_info);
907 break;
908#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
909 case sizeof(struct in6_addr):
910 ret_val = netlbl_unlhsh_remove_addr6(net,
911 iface, addr, mask,
912 audit_info);
913 break;
914#endif /* IPv6 */
915 default:
916 ret_val = -EINVAL;
917 }
918 if (ret_val == 0) {
919 netlbl_unlhsh_condremove_iface(iface);
920 atomic_dec(&netlabel_mgmt_protocount);
921 }
922
923unlhsh_remove_return:
924 rcu_read_unlock();
925 return ret_val;
926}
927
928/*
929 * General Helper Functions
930 */
931
932/**
933 * netlbl_unlhsh_netdev_handler - Network device notification handler
934 * @this: notifier block
935 * @event: the event
936 * @ptr: the network device (cast to void)
937 *
938 * Description:
939 * Handle network device events, although at present all we care about is a
940 * network device going away. In the case of a device going away we clear any
941 * related entries from the unlabeled connection hash table.
942 *
943 */
944static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
945 unsigned long event,
946 void *ptr)
947{
948 struct net_device *dev = ptr;
949 struct netlbl_unlhsh_iface *iface = NULL;
950
951 if (dev->nd_net != &init_net)
952 return NOTIFY_DONE;
953
954 /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
955 if (event == NETDEV_DOWN) {
956 spin_lock(&netlbl_unlhsh_lock);
957 iface = netlbl_unlhsh_search_iface(dev->ifindex);
958 if (iface != NULL && iface->valid) {
959 iface->valid = 0;
960 list_del_rcu(&iface->list);
961 } else
962 iface = NULL;
963 spin_unlock(&netlbl_unlhsh_lock);
964 }
965
966 if (iface != NULL)
967 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
968
969 return NOTIFY_DONE;
970}
71 971
72/** 972/**
73 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag 973 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
@@ -84,11 +984,8 @@ static void netlbl_unlabel_acceptflg_set(u8 value,
84 struct audit_buffer *audit_buf; 984 struct audit_buffer *audit_buf;
85 u8 old_val; 985 u8 old_val;
86 986
87 spin_lock(&netlabel_unlabel_acceptflg_lock);
88 old_val = netlabel_unlabel_acceptflg; 987 old_val = netlabel_unlabel_acceptflg;
89 netlabel_unlabel_acceptflg = value; 988 netlabel_unlabel_acceptflg = value;
90 spin_unlock(&netlabel_unlabel_acceptflg_lock);
91
92 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW, 989 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
93 audit_info); 990 audit_info);
94 if (audit_buf != NULL) { 991 if (audit_buf != NULL) {
@@ -98,6 +995,48 @@ static void netlbl_unlabel_acceptflg_set(u8 value,
98 } 995 }
99} 996}
100 997
998/**
999 * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
1000 * @info: the Generic NETLINK info block
1001 * @addr: the IP address
1002 * @mask: the IP address mask
1003 * @len: the address length
1004 *
1005 * Description:
1006 * Examine the Generic NETLINK message and extract the IP address information.
1007 * Returns zero on success, negative values on failure.
1008 *
1009 */
1010static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
1011 void **addr,
1012 void **mask,
1013 u32 *len)
1014{
1015 u32 addr_len;
1016
1017 if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
1018 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
1019 if (addr_len != sizeof(struct in_addr) &&
1020 addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
1021 return -EINVAL;
1022 *len = addr_len;
1023 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
1024 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
1025 return 0;
1026 } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
1027 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
1028 if (addr_len != sizeof(struct in6_addr) &&
1029 addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
1030 return -EINVAL;
1031 *len = addr_len;
1032 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
1033 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
1034 return 0;
1035 }
1036
1037 return -EINVAL;
1038}
1039
101/* 1040/*
102 * NetLabel Command Handlers 1041 * NetLabel Command Handlers
103 */ 1042 */
@@ -155,11 +1094,9 @@ static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
155 goto list_failure; 1094 goto list_failure;
156 } 1095 }
157 1096
158 rcu_read_lock();
159 ret_val = nla_put_u8(ans_skb, 1097 ret_val = nla_put_u8(ans_skb,
160 NLBL_UNLABEL_A_ACPTFLG, 1098 NLBL_UNLABEL_A_ACPTFLG,
161 netlabel_unlabel_acceptflg); 1099 netlabel_unlabel_acceptflg);
162 rcu_read_unlock();
163 if (ret_val != 0) 1100 if (ret_val != 0)
164 goto list_failure; 1101 goto list_failure;
165 1102
@@ -175,11 +1112,489 @@ list_failure:
175 return ret_val; 1112 return ret_val;
176} 1113}
177 1114
1115/**
1116 * netlbl_unlabel_staticadd - Handle a STATICADD message
1117 * @skb: the NETLINK buffer
1118 * @info: the Generic NETLINK info block
1119 *
1120 * Description:
1121 * Process a user generated STATICADD message and add a new unlabeled
1122 * connection entry to the hash table. Returns zero on success, negative
1123 * values on failure.
1124 *
1125 */
1126static int netlbl_unlabel_staticadd(struct sk_buff *skb,
1127 struct genl_info *info)
1128{
1129 int ret_val;
1130 char *dev_name;
1131 void *addr;
1132 void *mask;
1133 u32 addr_len;
1134 u32 secid;
1135 struct netlbl_audit audit_info;
1136
1137 /* Don't allow users to add both IPv4 and IPv6 addresses for a
1138 * single entry. However, allow users to create two entries, one each
1139 * for IPv4 and IPv4, with the same LSM security context which should
1140 * achieve the same result. */
1141 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
1142 !info->attrs[NLBL_UNLABEL_A_IFACE] ||
1143 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1144 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1145 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1146 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1147 return -EINVAL;
1148
1149 netlbl_netlink_auditinfo(skb, &audit_info);
1150
1151 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1152 if (ret_val != 0)
1153 return ret_val;
1154 dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1155 ret_val = security_secctx_to_secid(
1156 nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1157 nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1158 &secid);
1159 if (ret_val != 0)
1160 return ret_val;
1161
1162 return netlbl_unlhsh_add(&init_net,
1163 dev_name, addr, mask, addr_len, secid,
1164 &audit_info);
1165}
1166
1167/**
1168 * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
1169 * @skb: the NETLINK buffer
1170 * @info: the Generic NETLINK info block
1171 *
1172 * Description:
1173 * Process a user generated STATICADDDEF message and add a new default
1174 * unlabeled connection entry. Returns zero on success, negative values on
1175 * failure.
1176 *
1177 */
1178static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
1179 struct genl_info *info)
1180{
1181 int ret_val;
1182 void *addr;
1183 void *mask;
1184 u32 addr_len;
1185 u32 secid;
1186 struct netlbl_audit audit_info;
1187
1188 /* Don't allow users to add both IPv4 and IPv6 addresses for a
1189 * single entry. However, allow users to create two entries, one each
1190 * for IPv4 and IPv6, with the same LSM security context which should
1191 * achieve the same result. */
1192 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
1193 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1194 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1195 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1196 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1197 return -EINVAL;
1198
1199 netlbl_netlink_auditinfo(skb, &audit_info);
1200
1201 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1202 if (ret_val != 0)
1203 return ret_val;
1204 ret_val = security_secctx_to_secid(
1205 nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1206 nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
1207 &secid);
1208 if (ret_val != 0)
1209 return ret_val;
1210
1211 return netlbl_unlhsh_add(&init_net,
1212 NULL, addr, mask, addr_len, secid,
1213 &audit_info);
1214}
1215
1216/**
1217 * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
1218 * @skb: the NETLINK buffer
1219 * @info: the Generic NETLINK info block
1220 *
1221 * Description:
1222 * Process a user generated STATICREMOVE message and remove the specified
1223 * unlabeled connection entry. Returns zero on success, negative values on
1224 * failure.
1225 *
1226 */
1227static int netlbl_unlabel_staticremove(struct sk_buff *skb,
1228 struct genl_info *info)
1229{
1230 int ret_val;
1231 char *dev_name;
1232 void *addr;
1233 void *mask;
1234 u32 addr_len;
1235 struct netlbl_audit audit_info;
1236
1237 /* See the note in netlbl_unlabel_staticadd() about not allowing both
1238 * IPv4 and IPv6 in the same entry. */
1239 if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
1240 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1241 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1242 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1243 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1244 return -EINVAL;
1245
1246 netlbl_netlink_auditinfo(skb, &audit_info);
1247
1248 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1249 if (ret_val != 0)
1250 return ret_val;
1251 dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1252
1253 return netlbl_unlhsh_remove(&init_net,
1254 dev_name, addr, mask, addr_len,
1255 &audit_info);
1256}
1257
1258/**
1259 * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1260 * @skb: the NETLINK buffer
1261 * @info: the Generic NETLINK info block
1262 *
1263 * Description:
1264 * Process a user generated STATICREMOVEDEF message and remove the default
1265 * unlabeled connection entry. Returns zero on success, negative values on
1266 * failure.
1267 *
1268 */
1269static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1270 struct genl_info *info)
1271{
1272 int ret_val;
1273 void *addr;
1274 void *mask;
1275 u32 addr_len;
1276 struct netlbl_audit audit_info;
1277
1278 /* See the note in netlbl_unlabel_staticadd() about not allowing both
1279 * IPv4 and IPv6 in the same entry. */
1280 if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1281 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1282 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1283 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1284 return -EINVAL;
1285
1286 netlbl_netlink_auditinfo(skb, &audit_info);
1287
1288 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1289 if (ret_val != 0)
1290 return ret_val;
1291
1292 return netlbl_unlhsh_remove(&init_net,
1293 NULL, addr, mask, addr_len,
1294 &audit_info);
1295}
1296
1297
1298/**
1299 * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1300 * @cmd: command/message
1301 * @iface: the interface entry
1302 * @addr4: the IPv4 address entry
1303 * @addr6: the IPv6 address entry
1304 * @arg: the netlbl_unlhsh_walk_arg structure
1305 *
1306 * Description:
1307 * This function is designed to be used to generate a response for a
1308 * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6
1309 * can be specified, not both, the other unspecified entry should be set to
1310 * NULL by the caller. Returns the size of the message on success, negative
1311 * values on failure.
1312 *
1313 */
1314static int netlbl_unlabel_staticlist_gen(u32 cmd,
1315 const struct netlbl_unlhsh_iface *iface,
1316 const struct netlbl_unlhsh_addr4 *addr4,
1317 const struct netlbl_unlhsh_addr6 *addr6,
1318 void *arg)
1319{
1320 int ret_val = -ENOMEM;
1321 struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1322 struct net_device *dev;
1323 void *data;
1324 u32 secid;
1325 char *secctx;
1326 u32 secctx_len;
1327
1328 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
1329 cb_arg->seq, &netlbl_unlabel_gnl_family,
1330 NLM_F_MULTI, cmd);
1331 if (data == NULL)
1332 goto list_cb_failure;
1333
1334 if (iface->ifindex > 0) {
1335 dev = dev_get_by_index(&init_net, iface->ifindex);
1336 ret_val = nla_put_string(cb_arg->skb,
1337 NLBL_UNLABEL_A_IFACE, dev->name);
1338 dev_put(dev);
1339 if (ret_val != 0)
1340 goto list_cb_failure;
1341 }
1342
1343 if (addr4) {
1344 struct in_addr addr_struct;
1345
1346 addr_struct.s_addr = addr4->addr;
1347 ret_val = nla_put(cb_arg->skb,
1348 NLBL_UNLABEL_A_IPV4ADDR,
1349 sizeof(struct in_addr),
1350 &addr_struct);
1351 if (ret_val != 0)
1352 goto list_cb_failure;
1353
1354 addr_struct.s_addr = addr4->mask;
1355 ret_val = nla_put(cb_arg->skb,
1356 NLBL_UNLABEL_A_IPV4MASK,
1357 sizeof(struct in_addr),
1358 &addr_struct);
1359 if (ret_val != 0)
1360 goto list_cb_failure;
1361
1362 secid = addr4->secid;
1363 } else {
1364 ret_val = nla_put(cb_arg->skb,
1365 NLBL_UNLABEL_A_IPV6ADDR,
1366 sizeof(struct in6_addr),
1367 &addr6->addr);
1368 if (ret_val != 0)
1369 goto list_cb_failure;
1370
1371 ret_val = nla_put(cb_arg->skb,
1372 NLBL_UNLABEL_A_IPV6MASK,
1373 sizeof(struct in6_addr),
1374 &addr6->mask);
1375 if (ret_val != 0)
1376 goto list_cb_failure;
1377
1378 secid = addr6->secid;
1379 }
1380
1381 ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
1382 if (ret_val != 0)
1383 goto list_cb_failure;
1384 ret_val = nla_put(cb_arg->skb,
1385 NLBL_UNLABEL_A_SECCTX,
1386 secctx_len,
1387 secctx);
1388 security_release_secctx(secctx, secctx_len);
1389 if (ret_val != 0)
1390 goto list_cb_failure;
1391
1392 cb_arg->seq++;
1393 return genlmsg_end(cb_arg->skb, data);
1394
1395list_cb_failure:
1396 genlmsg_cancel(cb_arg->skb, data);
1397 return ret_val;
1398}
1399
1400/**
1401 * netlbl_unlabel_staticlist - Handle a STATICLIST message
1402 * @skb: the NETLINK buffer
1403 * @cb: the NETLINK callback
1404 *
1405 * Description:
1406 * Process a user generated STATICLIST message and dump the unlabeled
1407 * connection hash table in a form suitable for use in a kernel generated
1408 * STATICLIST message. Returns the length of @skb.
1409 *
1410 */
1411static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1412 struct netlink_callback *cb)
1413{
1414 struct netlbl_unlhsh_walk_arg cb_arg;
1415 u32 skip_bkt = cb->args[0];
1416 u32 skip_chain = cb->args[1];
1417 u32 skip_addr4 = cb->args[2];
1418 u32 skip_addr6 = cb->args[3];
1419 u32 iter_bkt;
1420 u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1421 struct netlbl_unlhsh_iface *iface;
1422 struct netlbl_unlhsh_addr4 *addr4;
1423 struct netlbl_unlhsh_addr6 *addr6;
1424
1425 cb_arg.nl_cb = cb;
1426 cb_arg.skb = skb;
1427 cb_arg.seq = cb->nlh->nlmsg_seq;
1428
1429 rcu_read_lock();
1430 for (iter_bkt = skip_bkt;
1431 iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1432 iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
1433 list_for_each_entry_rcu(iface,
1434 &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt],
1435 list) {
1436 if (!iface->valid ||
1437 iter_chain++ < skip_chain)
1438 continue;
1439 list_for_each_entry_rcu(addr4,
1440 &iface->addr4_list,
1441 list) {
1442 if (!addr4->valid || iter_addr4++ < skip_addr4)
1443 continue;
1444 if (netlbl_unlabel_staticlist_gen(
1445 NLBL_UNLABEL_C_STATICLIST,
1446 iface,
1447 addr4,
1448 NULL,
1449 &cb_arg) < 0) {
1450 iter_addr4--;
1451 iter_chain--;
1452 goto unlabel_staticlist_return;
1453 }
1454 }
1455 list_for_each_entry_rcu(addr6,
1456 &iface->addr6_list,
1457 list) {
1458 if (!addr6->valid || iter_addr6++ < skip_addr6)
1459 continue;
1460 if (netlbl_unlabel_staticlist_gen(
1461 NLBL_UNLABEL_C_STATICLIST,
1462 iface,
1463 NULL,
1464 addr6,
1465 &cb_arg) < 0) {
1466 iter_addr6--;
1467 iter_chain--;
1468 goto unlabel_staticlist_return;
1469 }
1470 }
1471 }
1472 }
1473
1474unlabel_staticlist_return:
1475 rcu_read_unlock();
1476 cb->args[0] = skip_bkt;
1477 cb->args[1] = skip_chain;
1478 cb->args[2] = skip_addr4;
1479 cb->args[3] = skip_addr6;
1480 return skb->len;
1481}
1482
1483/**
1484 * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1485 * @skb: the NETLINK buffer
1486 * @cb: the NETLINK callback
1487 *
1488 * Description:
1489 * Process a user generated STATICLISTDEF message and dump the default
1490 * unlabeled connection entry in a form suitable for use in a kernel generated
1491 * STATICLISTDEF message. Returns the length of @skb.
1492 *
1493 */
1494static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1495 struct netlink_callback *cb)
1496{
1497 struct netlbl_unlhsh_walk_arg cb_arg;
1498 struct netlbl_unlhsh_iface *iface;
1499 u32 skip_addr4 = cb->args[0];
1500 u32 skip_addr6 = cb->args[1];
1501 u32 iter_addr4 = 0, iter_addr6 = 0;
1502 struct netlbl_unlhsh_addr4 *addr4;
1503 struct netlbl_unlhsh_addr6 *addr6;
1504
1505 cb_arg.nl_cb = cb;
1506 cb_arg.skb = skb;
1507 cb_arg.seq = cb->nlh->nlmsg_seq;
1508
1509 rcu_read_lock();
1510 iface = rcu_dereference(netlbl_unlhsh_def);
1511 if (iface == NULL || !iface->valid)
1512 goto unlabel_staticlistdef_return;
1513
1514 list_for_each_entry_rcu(addr4, &iface->addr4_list, list) {
1515 if (!addr4->valid || iter_addr4++ < skip_addr4)
1516 continue;
1517 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1518 iface,
1519 addr4,
1520 NULL,
1521 &cb_arg) < 0) {
1522 iter_addr4--;
1523 goto unlabel_staticlistdef_return;
1524 }
1525 }
1526 list_for_each_entry_rcu(addr6, &iface->addr6_list, list) {
1527 if (addr6->valid || iter_addr6++ < skip_addr6)
1528 continue;
1529 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1530 iface,
1531 NULL,
1532 addr6,
1533 &cb_arg) < 0) {
1534 iter_addr6--;
1535 goto unlabel_staticlistdef_return;
1536 }
1537 }
1538
1539unlabel_staticlistdef_return:
1540 rcu_read_unlock();
1541 cb->args[0] = skip_addr4;
1542 cb->args[1] = skip_addr6;
1543 return skb->len;
1544}
178 1545
179/* 1546/*
180 * NetLabel Generic NETLINK Command Definitions 1547 * NetLabel Generic NETLINK Command Definitions
181 */ 1548 */
182 1549
1550static struct genl_ops netlbl_unlabel_genl_c_staticadd = {
1551 .cmd = NLBL_UNLABEL_C_STATICADD,
1552 .flags = GENL_ADMIN_PERM,
1553 .policy = netlbl_unlabel_genl_policy,
1554 .doit = netlbl_unlabel_staticadd,
1555 .dumpit = NULL,
1556};
1557
1558static struct genl_ops netlbl_unlabel_genl_c_staticremove = {
1559 .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1560 .flags = GENL_ADMIN_PERM,
1561 .policy = netlbl_unlabel_genl_policy,
1562 .doit = netlbl_unlabel_staticremove,
1563 .dumpit = NULL,
1564};
1565
1566static struct genl_ops netlbl_unlabel_genl_c_staticlist = {
1567 .cmd = NLBL_UNLABEL_C_STATICLIST,
1568 .flags = 0,
1569 .policy = netlbl_unlabel_genl_policy,
1570 .doit = NULL,
1571 .dumpit = netlbl_unlabel_staticlist,
1572};
1573
1574static struct genl_ops netlbl_unlabel_genl_c_staticadddef = {
1575 .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1576 .flags = GENL_ADMIN_PERM,
1577 .policy = netlbl_unlabel_genl_policy,
1578 .doit = netlbl_unlabel_staticadddef,
1579 .dumpit = NULL,
1580};
1581
1582static struct genl_ops netlbl_unlabel_genl_c_staticremovedef = {
1583 .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1584 .flags = GENL_ADMIN_PERM,
1585 .policy = netlbl_unlabel_genl_policy,
1586 .doit = netlbl_unlabel_staticremovedef,
1587 .dumpit = NULL,
1588};
1589
1590static struct genl_ops netlbl_unlabel_genl_c_staticlistdef = {
1591 .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1592 .flags = 0,
1593 .policy = netlbl_unlabel_genl_policy,
1594 .doit = NULL,
1595 .dumpit = netlbl_unlabel_staticlistdef,
1596};
1597
183static struct genl_ops netlbl_unlabel_genl_c_accept = { 1598static struct genl_ops netlbl_unlabel_genl_c_accept = {
184 .cmd = NLBL_UNLABEL_C_ACCEPT, 1599 .cmd = NLBL_UNLABEL_C_ACCEPT,
185 .flags = GENL_ADMIN_PERM, 1600 .flags = GENL_ADMIN_PERM,
@@ -196,7 +1611,6 @@ static struct genl_ops netlbl_unlabel_genl_c_list = {
196 .dumpit = NULL, 1611 .dumpit = NULL,
197}; 1612};
198 1613
199
200/* 1614/*
201 * NetLabel Generic NETLINK Protocol Functions 1615 * NetLabel Generic NETLINK Protocol Functions
202 */ 1616 */
@@ -218,6 +1632,36 @@ int netlbl_unlabel_genl_init(void)
218 return ret_val; 1632 return ret_val;
219 1633
220 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, 1634 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
1635 &netlbl_unlabel_genl_c_staticadd);
1636 if (ret_val != 0)
1637 return ret_val;
1638
1639 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
1640 &netlbl_unlabel_genl_c_staticremove);
1641 if (ret_val != 0)
1642 return ret_val;
1643
1644 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
1645 &netlbl_unlabel_genl_c_staticlist);
1646 if (ret_val != 0)
1647 return ret_val;
1648
1649 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
1650 &netlbl_unlabel_genl_c_staticadddef);
1651 if (ret_val != 0)
1652 return ret_val;
1653
1654 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
1655 &netlbl_unlabel_genl_c_staticremovedef);
1656 if (ret_val != 0)
1657 return ret_val;
1658
1659 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
1660 &netlbl_unlabel_genl_c_staticlistdef);
1661 if (ret_val != 0)
1662 return ret_val;
1663
1664 ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
221 &netlbl_unlabel_genl_c_accept); 1665 &netlbl_unlabel_genl_c_accept);
222 if (ret_val != 0) 1666 if (ret_val != 0)
223 return ret_val; 1667 return ret_val;
@@ -234,8 +1678,58 @@ int netlbl_unlabel_genl_init(void)
234 * NetLabel KAPI Hooks 1678 * NetLabel KAPI Hooks
235 */ 1679 */
236 1680
1681static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1682 .notifier_call = netlbl_unlhsh_netdev_handler,
1683};
1684
1685/**
1686 * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1687 * @size: the number of bits to use for the hash buckets
1688 *
1689 * Description:
1690 * Initializes the unlabeled connection hash table and registers a network
1691 * device notification handler. This function should only be called by the
1692 * NetLabel subsystem itself during initialization. Returns zero on success,
1693 * non-zero values on error.
1694 *
1695 */
1696int netlbl_unlabel_init(u32 size)
1697{
1698 u32 iter;
1699 struct netlbl_unlhsh_tbl *hsh_tbl;
1700
1701 if (size == 0)
1702 return -EINVAL;
1703
1704 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1705 if (hsh_tbl == NULL)
1706 return -ENOMEM;
1707 hsh_tbl->size = 1 << size;
1708 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1709 sizeof(struct list_head),
1710 GFP_KERNEL);
1711 if (hsh_tbl->tbl == NULL) {
1712 kfree(hsh_tbl);
1713 return -ENOMEM;
1714 }
1715 for (iter = 0; iter < hsh_tbl->size; iter++)
1716 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
1717
1718 rcu_read_lock();
1719 spin_lock(&netlbl_unlhsh_lock);
1720 rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1721 spin_unlock(&netlbl_unlhsh_lock);
1722 rcu_read_unlock();
1723
1724 register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
1725
1726 return 0;
1727}
1728
237/** 1729/**
238 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet 1730 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1731 * @skb: the packet
1732 * @family: protocol family
239 * @secattr: the security attributes 1733 * @secattr: the security attributes
240 * 1734 *
241 * Description: 1735 * Description:
@@ -243,19 +1737,52 @@ int netlbl_unlabel_genl_init(void)
243 * them in @secattr. Returns zero on success and negative values on failure. 1737 * them in @secattr. Returns zero on success and negative values on failure.
244 * 1738 *
245 */ 1739 */
246int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr) 1740int netlbl_unlabel_getattr(const struct sk_buff *skb,
1741 u16 family,
1742 struct netlbl_lsm_secattr *secattr)
247{ 1743{
248 int ret_val; 1744 struct iphdr *hdr4;
1745 struct ipv6hdr *hdr6;
1746 struct netlbl_unlhsh_addr4 *addr4;
1747 struct netlbl_unlhsh_addr6 *addr6;
1748 struct netlbl_unlhsh_iface *iface;
249 1749
250 rcu_read_lock(); 1750 rcu_read_lock();
251 if (netlabel_unlabel_acceptflg == 1) { 1751 iface = netlbl_unlhsh_search_iface_def(skb->iif);
252 netlbl_secattr_init(secattr); 1752 if (iface == NULL)
253 ret_val = 0; 1753 goto unlabel_getattr_nolabel;
254 } else 1754 switch (family) {
255 ret_val = -ENOMSG; 1755 case PF_INET:
1756 hdr4 = ip_hdr(skb);
1757 addr4 = netlbl_unlhsh_search_addr4(hdr4->saddr, iface);
1758 if (addr4 == NULL)
1759 goto unlabel_getattr_nolabel;
1760 secattr->attr.secid = addr4->secid;
1761 break;
1762#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1763 case PF_INET6:
1764 hdr6 = ipv6_hdr(skb);
1765 addr6 = netlbl_unlhsh_search_addr6(&hdr6->saddr, iface);
1766 if (addr6 == NULL)
1767 goto unlabel_getattr_nolabel;
1768 secattr->attr.secid = addr6->secid;
1769 break;
1770#endif /* IPv6 */
1771 default:
1772 goto unlabel_getattr_nolabel;
1773 }
256 rcu_read_unlock(); 1774 rcu_read_unlock();
257 1775
258 return ret_val; 1776 secattr->flags |= NETLBL_SECATTR_SECID;
1777 secattr->type = NETLBL_NLTYPE_UNLABELED;
1778 return 0;
1779
1780unlabel_getattr_nolabel:
1781 rcu_read_unlock();
1782 if (netlabel_unlabel_acceptflg == 0)
1783 return -ENOMSG;
1784 secattr->type = NETLBL_NLTYPE_UNLABELED;
1785 return 0;
259} 1786}
260 1787
261/** 1788/**
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-11 10:43:13 -0400