2 * NetLabel Unlabeled Support
4 * This file defines functions for dealing with unlabeled packets for the
5 * NetLabel system. The NetLabel system manages static and dynamic label
6 * mappings for network protocols such as CIPSO and RIPSO.
8 * Author: Paul Moore <paul.moore@hp.com>
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
23 * the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #include <linux/types.h>
32 #include <linux/rcupdate.h>
33 #include <linux/list.h>
34 #include <linux/spinlock.h>
35 #include <linux/socket.h>
36 #include <linux/string.h>
37 #include <linux/skbuff.h>
38 #include <linux/audit.h>
40 #include <linux/in6.h>
42 #include <linux/ipv6.h>
43 #include <linux/notifier.h>
44 #include <linux/netdevice.h>
45 #include <linux/security.h>
46 #include <linux/slab.h>
48 #include <net/netlink.h>
49 #include <net/genetlink.h>
52 #include <net/net_namespace.h>
53 #include <net/netlabel.h>
55 #include <asm/atomic.h>
57 #include "netlabel_user.h"
58 #include "netlabel_addrlist.h"
59 #include "netlabel_domainhash.h"
60 #include "netlabel_unlabeled.h"
61 #include "netlabel_mgmt.h"
63 /* NOTE: at present we always use init's network namespace since we don't
64 * presently support different namespaces even though the majority of
65 * the functions in this file are "namespace safe" */
67 /* The unlabeled connection hash table which we use to map network interfaces
68 * and addresses of unlabeled packets to a user specified secid value for the
69 * LSM. The hash table is used to lookup the network interface entry
70 * (struct netlbl_unlhsh_iface) and then the interface entry is used to
71 * lookup an IP address match from an ordered list. If a network interface
72 * match can not be found in the hash table then the default entry
73 * (netlbl_unlhsh_def) is used. The IP address entry list
74 * (struct netlbl_unlhsh_addr) is ordered such that the entries with a
75 * larger netmask come first.
77 struct netlbl_unlhsh_tbl {
78 struct list_head *tbl;
81 #define netlbl_unlhsh_addr4_entry(iter) \
82 container_of(iter, struct netlbl_unlhsh_addr4, list)
83 struct netlbl_unlhsh_addr4 {
86 struct netlbl_af4list list;
89 #define netlbl_unlhsh_addr6_entry(iter) \
90 container_of(iter, struct netlbl_unlhsh_addr6, list)
91 struct netlbl_unlhsh_addr6 {
94 struct netlbl_af6list list;
97 struct netlbl_unlhsh_iface {
99 struct list_head addr4_list;
100 struct list_head addr6_list;
103 struct list_head list;
107 /* Argument struct for netlbl_unlhsh_walk() */
108 struct netlbl_unlhsh_walk_arg {
109 struct netlink_callback *nl_cb;
114 /* Unlabeled connection hash table */
115 /* updates should be so rare that having one spinlock for the entire
116 * hash table should be okay */
117 static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
118 #define netlbl_unlhsh_rcu_deref(p) \
119 rcu_dereference_check(p, rcu_read_lock_held() || \
120 lockdep_is_held(&netlbl_unlhsh_lock))
121 static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
122 static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
124 /* Accept unlabeled packets flag */
125 static u8 netlabel_unlabel_acceptflg = 0;
127 /* NetLabel Generic NETLINK unlabeled family */
128 static struct genl_family netlbl_unlabel_gnl_family = {
129 .id = GENL_ID_GENERATE,
131 .name = NETLBL_NLTYPE_UNLABELED_NAME,
132 .version = NETLBL_PROTO_VERSION,
133 .maxattr = NLBL_UNLABEL_A_MAX,
136 /* NetLabel Netlink attribute policy */
137 static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
138 [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
139 [NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
140 .len = sizeof(struct in6_addr) },
141 [NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
142 .len = sizeof(struct in6_addr) },
143 [NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
144 .len = sizeof(struct in_addr) },
145 [NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
146 .len = sizeof(struct in_addr) },
147 [NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
148 .len = IFNAMSIZ - 1 },
149 [NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
153 * Unlabeled Connection Hash Table Functions
157 * netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
158 * @entry: the entry's RCU field
161 * This function is designed to be used as a callback to the call_rcu()
162 * function so that memory allocated to a hash table interface entry can be
163 * released safely. It is important to note that this function does not free
164 * the IPv4 and IPv6 address lists contained as part of an interface entry. It
165 * is up to the rest of the code to make sure an interface entry is only freed
166 * once it's address lists are empty.
169 static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
171 struct netlbl_unlhsh_iface *iface;
172 struct netlbl_af4list *iter4;
173 struct netlbl_af4list *tmp4;
174 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
175 struct netlbl_af6list *iter6;
176 struct netlbl_af6list *tmp6;
179 iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
181 /* no need for locks here since we are the only one with access to this
184 netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
185 netlbl_af4list_remove_entry(iter4);
186 kfree(netlbl_unlhsh_addr4_entry(iter4));
188 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
189 netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
190 netlbl_af6list_remove_entry(iter6);
191 kfree(netlbl_unlhsh_addr6_entry(iter6));
198 * netlbl_unlhsh_hash - Hashing function for the hash table
199 * @ifindex: the network interface/device to hash
202 * This is the hashing function for the unlabeled hash table, it returns the
203 * bucket number for the given device/interface. The caller is responsible for
204 * ensuring that the hash table is protected with either a RCU read lock or
205 * the hash table lock.
208 static u32 netlbl_unlhsh_hash(int ifindex)
210 return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
214 * netlbl_unlhsh_search_iface - Search for a matching interface entry
215 * @ifindex: the network interface
218 * Searches the unlabeled connection hash table and returns a pointer to the
219 * interface entry which matches @ifindex, otherwise NULL is returned. The
220 * caller is responsible for ensuring that the hash table is protected with
221 * either a RCU read lock or the hash table lock.
224 static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
227 struct list_head *bkt_list;
228 struct netlbl_unlhsh_iface *iter;
230 bkt = netlbl_unlhsh_hash(ifindex);
231 bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
232 list_for_each_entry_rcu(iter, bkt_list, list)
233 if (iter->valid && iter->ifindex == ifindex)
240 * netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
241 * @iface: the associated interface entry
242 * @addr: IPv4 address in network byte order
243 * @mask: IPv4 address mask in network byte order
244 * @secid: LSM secid value for entry
247 * Add a new address entry into the unlabeled connection hash table using the
248 * interface entry specified by @iface. On success zero is returned, otherwise
249 * a negative value is returned.
252 static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
253 const struct in_addr *addr,
254 const struct in_addr *mask,
258 struct netlbl_unlhsh_addr4 *entry;
260 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
264 entry->list.addr = addr->s_addr & mask->s_addr;
265 entry->list.mask = mask->s_addr;
266 entry->list.valid = 1;
267 entry->secid = secid;
269 spin_lock(&netlbl_unlhsh_lock);
270 ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
271 spin_unlock(&netlbl_unlhsh_lock);
278 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
280 * netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
281 * @iface: the associated interface entry
282 * @addr: IPv6 address in network byte order
283 * @mask: IPv6 address mask in network byte order
284 * @secid: LSM secid value for entry
287 * Add a new address entry into the unlabeled connection hash table using the
288 * interface entry specified by @iface. On success zero is returned, otherwise
289 * a negative value is returned.
292 static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
293 const struct in6_addr *addr,
294 const struct in6_addr *mask,
298 struct netlbl_unlhsh_addr6 *entry;
300 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
304 ipv6_addr_copy(&entry->list.addr, addr);
305 entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
306 entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
307 entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
308 entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
309 ipv6_addr_copy(&entry->list.mask, mask);
310 entry->list.valid = 1;
311 entry->secid = secid;
313 spin_lock(&netlbl_unlhsh_lock);
314 ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
315 spin_unlock(&netlbl_unlhsh_lock);
324 * netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
325 * @ifindex: network interface
328 * Add a new, empty, interface entry into the unlabeled connection hash table.
329 * On success a pointer to the new interface entry is returned, on failure NULL
333 static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
336 struct netlbl_unlhsh_iface *iface;
338 iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
342 iface->ifindex = ifindex;
343 INIT_LIST_HEAD(&iface->addr4_list);
344 INIT_LIST_HEAD(&iface->addr6_list);
347 spin_lock(&netlbl_unlhsh_lock);
349 bkt = netlbl_unlhsh_hash(ifindex);
350 if (netlbl_unlhsh_search_iface(ifindex) != NULL)
351 goto add_iface_failure;
352 list_add_tail_rcu(&iface->list,
353 &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
355 INIT_LIST_HEAD(&iface->list);
356 if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
357 goto add_iface_failure;
358 rcu_assign_pointer(netlbl_unlhsh_def, iface);
360 spin_unlock(&netlbl_unlhsh_lock);
365 spin_unlock(&netlbl_unlhsh_lock);
371 * netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
372 * @net: network namespace
373 * @dev_name: interface name
374 * @addr: IP address in network byte order
375 * @mask: address mask in network byte order
376 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
377 * @secid: LSM secid value for the entry
378 * @audit_info: NetLabel audit information
381 * Adds a new entry to the unlabeled connection hash table. Returns zero on
382 * success, negative values on failure.
385 int netlbl_unlhsh_add(struct net *net,
386 const char *dev_name,
391 struct netlbl_audit *audit_info)
395 struct net_device *dev;
396 struct netlbl_unlhsh_iface *iface;
397 struct audit_buffer *audit_buf = NULL;
401 if (addr_len != sizeof(struct in_addr) &&
402 addr_len != sizeof(struct in6_addr))
406 if (dev_name != NULL) {
407 dev = dev_get_by_name_rcu(net, dev_name);
410 goto unlhsh_add_return;
412 ifindex = dev->ifindex;
413 iface = netlbl_unlhsh_search_iface(ifindex);
416 iface = rcu_dereference(netlbl_unlhsh_def);
419 iface = netlbl_unlhsh_add_iface(ifindex);
422 goto unlhsh_add_return;
425 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
428 case sizeof(struct in_addr): {
429 const struct in_addr *addr4 = addr;
430 const struct in_addr *mask4 = mask;
432 ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
433 if (audit_buf != NULL)
434 netlbl_af4list_audit_addr(audit_buf, 1,
440 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
441 case sizeof(struct in6_addr): {
442 const struct in6_addr *addr6 = addr;
443 const struct in6_addr *mask6 = mask;
445 ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
446 if (audit_buf != NULL)
447 netlbl_af6list_audit_addr(audit_buf, 1,
457 atomic_inc(&netlabel_mgmt_protocount);
461 if (audit_buf != NULL) {
462 if (security_secid_to_secctx(secid,
465 audit_log_format(audit_buf, " sec_obj=%s", secctx);
466 security_release_secctx(secctx, secctx_len);
468 audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
469 audit_log_end(audit_buf);
475 * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
476 * @net: network namespace
477 * @iface: interface entry
479 * @mask: IP address mask
480 * @audit_info: NetLabel audit information
483 * Remove an IP address entry from the unlabeled connection hash table.
484 * Returns zero on success, negative values on failure.
487 static int netlbl_unlhsh_remove_addr4(struct net *net,
488 struct netlbl_unlhsh_iface *iface,
489 const struct in_addr *addr,
490 const struct in_addr *mask,
491 struct netlbl_audit *audit_info)
493 struct netlbl_af4list *list_entry;
494 struct netlbl_unlhsh_addr4 *entry;
495 struct audit_buffer *audit_buf;
496 struct net_device *dev;
500 spin_lock(&netlbl_unlhsh_lock);
501 list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
503 spin_unlock(&netlbl_unlhsh_lock);
504 if (list_entry != NULL)
505 entry = netlbl_unlhsh_addr4_entry(list_entry);
509 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
511 if (audit_buf != NULL) {
512 dev = dev_get_by_index(net, iface->ifindex);
513 netlbl_af4list_audit_addr(audit_buf, 1,
514 (dev != NULL ? dev->name : NULL),
515 addr->s_addr, mask->s_addr);
519 security_secid_to_secctx(entry->secid,
520 &secctx, &secctx_len) == 0) {
521 audit_log_format(audit_buf, " sec_obj=%s", secctx);
522 security_release_secctx(secctx, secctx_len);
524 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
525 audit_log_end(audit_buf);
531 kfree_rcu(entry, rcu);
535 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
537 * netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
538 * @net: network namespace
539 * @iface: interface entry
541 * @mask: IP address mask
542 * @audit_info: NetLabel audit information
545 * Remove an IP address entry from the unlabeled connection hash table.
546 * Returns zero on success, negative values on failure.
549 static int netlbl_unlhsh_remove_addr6(struct net *net,
550 struct netlbl_unlhsh_iface *iface,
551 const struct in6_addr *addr,
552 const struct in6_addr *mask,
553 struct netlbl_audit *audit_info)
555 struct netlbl_af6list *list_entry;
556 struct netlbl_unlhsh_addr6 *entry;
557 struct audit_buffer *audit_buf;
558 struct net_device *dev;
562 spin_lock(&netlbl_unlhsh_lock);
563 list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
564 spin_unlock(&netlbl_unlhsh_lock);
565 if (list_entry != NULL)
566 entry = netlbl_unlhsh_addr6_entry(list_entry);
570 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
572 if (audit_buf != NULL) {
573 dev = dev_get_by_index(net, iface->ifindex);
574 netlbl_af6list_audit_addr(audit_buf, 1,
575 (dev != NULL ? dev->name : NULL),
580 security_secid_to_secctx(entry->secid,
581 &secctx, &secctx_len) == 0) {
582 audit_log_format(audit_buf, " sec_obj=%s", secctx);
583 security_release_secctx(secctx, secctx_len);
585 audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
586 audit_log_end(audit_buf);
592 kfree_rcu(entry, rcu);
598 * netlbl_unlhsh_condremove_iface - Remove an interface entry
599 * @iface: the interface entry
602 * Remove an interface entry from the unlabeled connection hash table if it is
603 * empty. An interface entry is considered to be empty if there are no
604 * address entries assigned to it.
607 static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
609 struct netlbl_af4list *iter4;
610 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
611 struct netlbl_af6list *iter6;
614 spin_lock(&netlbl_unlhsh_lock);
615 netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
616 goto unlhsh_condremove_failure;
617 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
618 netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
619 goto unlhsh_condremove_failure;
622 if (iface->ifindex > 0)
623 list_del_rcu(&iface->list);
625 rcu_assign_pointer(netlbl_unlhsh_def, NULL);
626 spin_unlock(&netlbl_unlhsh_lock);
628 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
631 unlhsh_condremove_failure:
632 spin_unlock(&netlbl_unlhsh_lock);
636 * netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
637 * @net: network namespace
638 * @dev_name: interface name
639 * @addr: IP address in network byte order
640 * @mask: address mask in network byte order
641 * @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
642 * @audit_info: NetLabel audit information
645 * Removes and existing entry from the unlabeled connection hash table.
646 * Returns zero on success, negative values on failure.
649 int netlbl_unlhsh_remove(struct net *net,
650 const char *dev_name,
654 struct netlbl_audit *audit_info)
657 struct net_device *dev;
658 struct netlbl_unlhsh_iface *iface;
660 if (addr_len != sizeof(struct in_addr) &&
661 addr_len != sizeof(struct in6_addr))
665 if (dev_name != NULL) {
666 dev = dev_get_by_name_rcu(net, dev_name);
669 goto unlhsh_remove_return;
671 iface = netlbl_unlhsh_search_iface(dev->ifindex);
673 iface = rcu_dereference(netlbl_unlhsh_def);
676 goto unlhsh_remove_return;
679 case sizeof(struct in_addr):
680 ret_val = netlbl_unlhsh_remove_addr4(net,
684 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
685 case sizeof(struct in6_addr):
686 ret_val = netlbl_unlhsh_remove_addr6(net,
695 netlbl_unlhsh_condremove_iface(iface);
696 atomic_dec(&netlabel_mgmt_protocount);
699 unlhsh_remove_return:
705 * General Helper Functions
709 * netlbl_unlhsh_netdev_handler - Network device notification handler
710 * @this: notifier block
712 * @ptr: the network device (cast to void)
715 * Handle network device events, although at present all we care about is a
716 * network device going away. In the case of a device going away we clear any
717 * related entries from the unlabeled connection hash table.
720 static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
724 struct net_device *dev = ptr;
725 struct netlbl_unlhsh_iface *iface = NULL;
727 if (!net_eq(dev_net(dev), &init_net))
730 /* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
731 if (event == NETDEV_DOWN) {
732 spin_lock(&netlbl_unlhsh_lock);
733 iface = netlbl_unlhsh_search_iface(dev->ifindex);
734 if (iface != NULL && iface->valid) {
736 list_del_rcu(&iface->list);
739 spin_unlock(&netlbl_unlhsh_lock);
743 call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
749 * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
750 * @value: desired value
751 * @audit_info: NetLabel audit information
754 * Set the value of the unlabeled accept flag to @value.
757 static void netlbl_unlabel_acceptflg_set(u8 value,
758 struct netlbl_audit *audit_info)
760 struct audit_buffer *audit_buf;
763 old_val = netlabel_unlabel_acceptflg;
764 netlabel_unlabel_acceptflg = value;
765 audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
767 if (audit_buf != NULL) {
768 audit_log_format(audit_buf,
769 " unlbl_accept=%u old=%u", value, old_val);
770 audit_log_end(audit_buf);
775 * netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
776 * @info: the Generic NETLINK info block
777 * @addr: the IP address
778 * @mask: the IP address mask
779 * @len: the address length
782 * Examine the Generic NETLINK message and extract the IP address information.
783 * Returns zero on success, negative values on failure.
786 static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
793 if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
794 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
795 if (addr_len != sizeof(struct in_addr) &&
796 addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
799 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
800 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
802 } else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
803 addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
804 if (addr_len != sizeof(struct in6_addr) &&
805 addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
808 *addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
809 *mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
817 * NetLabel Command Handlers
821 * netlbl_unlabel_accept - Handle an ACCEPT message
822 * @skb: the NETLINK buffer
823 * @info: the Generic NETLINK info block
826 * Process a user generated ACCEPT message and set the accept flag accordingly.
827 * Returns zero on success, negative values on failure.
830 static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
833 struct netlbl_audit audit_info;
835 if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
836 value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
837 if (value == 1 || value == 0) {
838 netlbl_netlink_auditinfo(skb, &audit_info);
839 netlbl_unlabel_acceptflg_set(value, &audit_info);
848 * netlbl_unlabel_list - Handle a LIST message
849 * @skb: the NETLINK buffer
850 * @info: the Generic NETLINK info block
853 * Process a user generated LIST message and respond with the current status.
854 * Returns zero on success, negative values on failure.
857 static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
859 int ret_val = -EINVAL;
860 struct sk_buff *ans_skb;
863 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
866 data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
867 0, NLBL_UNLABEL_C_LIST);
873 ret_val = nla_put_u8(ans_skb,
874 NLBL_UNLABEL_A_ACPTFLG,
875 netlabel_unlabel_acceptflg);
879 genlmsg_end(ans_skb, data);
880 return genlmsg_reply(ans_skb, info);
888 * netlbl_unlabel_staticadd - Handle a STATICADD message
889 * @skb: the NETLINK buffer
890 * @info: the Generic NETLINK info block
893 * Process a user generated STATICADD message and add a new unlabeled
894 * connection entry to the hash table. Returns zero on success, negative
898 static int netlbl_unlabel_staticadd(struct sk_buff *skb,
899 struct genl_info *info)
907 struct netlbl_audit audit_info;
909 /* Don't allow users to add both IPv4 and IPv6 addresses for a
910 * single entry. However, allow users to create two entries, one each
911 * for IPv4 and IPv4, with the same LSM security context which should
912 * achieve the same result. */
913 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
914 !info->attrs[NLBL_UNLABEL_A_IFACE] ||
915 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
916 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
917 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
918 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
921 netlbl_netlink_auditinfo(skb, &audit_info);
923 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
926 dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
927 ret_val = security_secctx_to_secid(
928 nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
929 nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
934 return netlbl_unlhsh_add(&init_net,
935 dev_name, addr, mask, addr_len, secid,
940 * netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
941 * @skb: the NETLINK buffer
942 * @info: the Generic NETLINK info block
945 * Process a user generated STATICADDDEF message and add a new default
946 * unlabeled connection entry. Returns zero on success, negative values on
950 static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
951 struct genl_info *info)
958 struct netlbl_audit audit_info;
960 /* Don't allow users to add both IPv4 and IPv6 addresses for a
961 * single entry. However, allow users to create two entries, one each
962 * for IPv4 and IPv6, with the same LSM security context which should
963 * achieve the same result. */
964 if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
965 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
966 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
967 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
968 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
971 netlbl_netlink_auditinfo(skb, &audit_info);
973 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
976 ret_val = security_secctx_to_secid(
977 nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
978 nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
983 return netlbl_unlhsh_add(&init_net,
984 NULL, addr, mask, addr_len, secid,
989 * netlbl_unlabel_staticremove - Handle a STATICREMOVE message
990 * @skb: the NETLINK buffer
991 * @info: the Generic NETLINK info block
994 * Process a user generated STATICREMOVE message and remove the specified
995 * unlabeled connection entry. Returns zero on success, negative values on
999 static int netlbl_unlabel_staticremove(struct sk_buff *skb,
1000 struct genl_info *info)
1007 struct netlbl_audit audit_info;
1009 /* See the note in netlbl_unlabel_staticadd() about not allowing both
1010 * IPv4 and IPv6 in the same entry. */
1011 if (!info->attrs[NLBL_UNLABEL_A_IFACE] ||
1012 !((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1013 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1014 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1015 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1018 netlbl_netlink_auditinfo(skb, &audit_info);
1020 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1023 dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
1025 return netlbl_unlhsh_remove(&init_net,
1026 dev_name, addr, mask, addr_len,
1031 * netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
1032 * @skb: the NETLINK buffer
1033 * @info: the Generic NETLINK info block
1036 * Process a user generated STATICREMOVEDEF message and remove the default
1037 * unlabeled connection entry. Returns zero on success, negative values on
1041 static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
1042 struct genl_info *info)
1048 struct netlbl_audit audit_info;
1050 /* See the note in netlbl_unlabel_staticadd() about not allowing both
1051 * IPv4 and IPv6 in the same entry. */
1052 if (!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
1053 !info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
1054 (!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
1055 !info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
1058 netlbl_netlink_auditinfo(skb, &audit_info);
1060 ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
1064 return netlbl_unlhsh_remove(&init_net,
1065 NULL, addr, mask, addr_len,
1071 * netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
1072 * @cmd: command/message
1073 * @iface: the interface entry
1074 * @addr4: the IPv4 address entry
1075 * @addr6: the IPv6 address entry
1076 * @arg: the netlbl_unlhsh_walk_arg structure
1079 * This function is designed to be used to generate a response for a
1080 * STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6
1081 * can be specified, not both, the other unspecified entry should be set to
1082 * NULL by the caller. Returns the size of the message on success, negative
1083 * values on failure.
1086 static int netlbl_unlabel_staticlist_gen(u32 cmd,
1087 const struct netlbl_unlhsh_iface *iface,
1088 const struct netlbl_unlhsh_addr4 *addr4,
1089 const struct netlbl_unlhsh_addr6 *addr6,
1092 int ret_val = -ENOMEM;
1093 struct netlbl_unlhsh_walk_arg *cb_arg = arg;
1094 struct net_device *dev;
1100 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
1101 cb_arg->seq, &netlbl_unlabel_gnl_family,
1104 goto list_cb_failure;
1106 if (iface->ifindex > 0) {
1107 dev = dev_get_by_index(&init_net, iface->ifindex);
1110 goto list_cb_failure;
1112 ret_val = nla_put_string(cb_arg->skb,
1113 NLBL_UNLABEL_A_IFACE, dev->name);
1116 goto list_cb_failure;
1120 struct in_addr addr_struct;
1122 addr_struct.s_addr = addr4->list.addr;
1123 ret_val = nla_put(cb_arg->skb,
1124 NLBL_UNLABEL_A_IPV4ADDR,
1125 sizeof(struct in_addr),
1128 goto list_cb_failure;
1130 addr_struct.s_addr = addr4->list.mask;
1131 ret_val = nla_put(cb_arg->skb,
1132 NLBL_UNLABEL_A_IPV4MASK,
1133 sizeof(struct in_addr),
1136 goto list_cb_failure;
1138 secid = addr4->secid;
1140 ret_val = nla_put(cb_arg->skb,
1141 NLBL_UNLABEL_A_IPV6ADDR,
1142 sizeof(struct in6_addr),
1145 goto list_cb_failure;
1147 ret_val = nla_put(cb_arg->skb,
1148 NLBL_UNLABEL_A_IPV6MASK,
1149 sizeof(struct in6_addr),
1152 goto list_cb_failure;
1154 secid = addr6->secid;
1157 ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
1159 goto list_cb_failure;
1160 ret_val = nla_put(cb_arg->skb,
1161 NLBL_UNLABEL_A_SECCTX,
1164 security_release_secctx(secctx, secctx_len);
1166 goto list_cb_failure;
1169 return genlmsg_end(cb_arg->skb, data);
1172 genlmsg_cancel(cb_arg->skb, data);
1177 * netlbl_unlabel_staticlist - Handle a STATICLIST message
1178 * @skb: the NETLINK buffer
1179 * @cb: the NETLINK callback
1182 * Process a user generated STATICLIST message and dump the unlabeled
1183 * connection hash table in a form suitable for use in a kernel generated
1184 * STATICLIST message. Returns the length of @skb.
1187 static int netlbl_unlabel_staticlist(struct sk_buff *skb,
1188 struct netlink_callback *cb)
1190 struct netlbl_unlhsh_walk_arg cb_arg;
1191 u32 skip_bkt = cb->args[0];
1192 u32 skip_chain = cb->args[1];
1193 u32 skip_addr4 = cb->args[2];
1194 u32 skip_addr6 = cb->args[3];
1196 u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
1197 struct netlbl_unlhsh_iface *iface;
1198 struct list_head *iter_list;
1199 struct netlbl_af4list *addr4;
1200 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1201 struct netlbl_af6list *addr6;
1206 cb_arg.seq = cb->nlh->nlmsg_seq;
1209 for (iter_bkt = skip_bkt;
1210 iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
1211 iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
1212 iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt];
1213 list_for_each_entry_rcu(iface, iter_list, list) {
1214 if (!iface->valid ||
1215 iter_chain++ < skip_chain)
1217 netlbl_af4list_foreach_rcu(addr4,
1218 &iface->addr4_list) {
1219 if (iter_addr4++ < skip_addr4)
1221 if (netlbl_unlabel_staticlist_gen(
1222 NLBL_UNLABEL_C_STATICLIST,
1224 netlbl_unlhsh_addr4_entry(addr4),
1229 goto unlabel_staticlist_return;
1232 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1233 netlbl_af6list_foreach_rcu(addr6,
1234 &iface->addr6_list) {
1235 if (iter_addr6++ < skip_addr6)
1237 if (netlbl_unlabel_staticlist_gen(
1238 NLBL_UNLABEL_C_STATICLIST,
1241 netlbl_unlhsh_addr6_entry(addr6),
1245 goto unlabel_staticlist_return;
1252 unlabel_staticlist_return:
1254 cb->args[0] = skip_bkt;
1255 cb->args[1] = skip_chain;
1256 cb->args[2] = skip_addr4;
1257 cb->args[3] = skip_addr6;
1262 * netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
1263 * @skb: the NETLINK buffer
1264 * @cb: the NETLINK callback
1267 * Process a user generated STATICLISTDEF message and dump the default
1268 * unlabeled connection entry in a form suitable for use in a kernel generated
1269 * STATICLISTDEF message. Returns the length of @skb.
1272 static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
1273 struct netlink_callback *cb)
1275 struct netlbl_unlhsh_walk_arg cb_arg;
1276 struct netlbl_unlhsh_iface *iface;
1277 u32 skip_addr4 = cb->args[0];
1278 u32 skip_addr6 = cb->args[1];
1280 struct netlbl_af4list *addr4;
1281 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1283 struct netlbl_af6list *addr6;
1288 cb_arg.seq = cb->nlh->nlmsg_seq;
1291 iface = rcu_dereference(netlbl_unlhsh_def);
1292 if (iface == NULL || !iface->valid)
1293 goto unlabel_staticlistdef_return;
1295 netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) {
1296 if (iter_addr4++ < skip_addr4)
1298 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1300 netlbl_unlhsh_addr4_entry(addr4),
1304 goto unlabel_staticlistdef_return;
1307 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1308 netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) {
1309 if (iter_addr6++ < skip_addr6)
1311 if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
1314 netlbl_unlhsh_addr6_entry(addr6),
1317 goto unlabel_staticlistdef_return;
1322 unlabel_staticlistdef_return:
1324 cb->args[0] = skip_addr4;
1325 cb->args[1] = skip_addr6;
1330 * NetLabel Generic NETLINK Command Definitions
1333 static struct genl_ops netlbl_unlabel_genl_ops[] = {
1335 .cmd = NLBL_UNLABEL_C_STATICADD,
1336 .flags = GENL_ADMIN_PERM,
1337 .policy = netlbl_unlabel_genl_policy,
1338 .doit = netlbl_unlabel_staticadd,
1342 .cmd = NLBL_UNLABEL_C_STATICREMOVE,
1343 .flags = GENL_ADMIN_PERM,
1344 .policy = netlbl_unlabel_genl_policy,
1345 .doit = netlbl_unlabel_staticremove,
1349 .cmd = NLBL_UNLABEL_C_STATICLIST,
1351 .policy = netlbl_unlabel_genl_policy,
1353 .dumpit = netlbl_unlabel_staticlist,
1356 .cmd = NLBL_UNLABEL_C_STATICADDDEF,
1357 .flags = GENL_ADMIN_PERM,
1358 .policy = netlbl_unlabel_genl_policy,
1359 .doit = netlbl_unlabel_staticadddef,
1363 .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
1364 .flags = GENL_ADMIN_PERM,
1365 .policy = netlbl_unlabel_genl_policy,
1366 .doit = netlbl_unlabel_staticremovedef,
1370 .cmd = NLBL_UNLABEL_C_STATICLISTDEF,
1372 .policy = netlbl_unlabel_genl_policy,
1374 .dumpit = netlbl_unlabel_staticlistdef,
1377 .cmd = NLBL_UNLABEL_C_ACCEPT,
1378 .flags = GENL_ADMIN_PERM,
1379 .policy = netlbl_unlabel_genl_policy,
1380 .doit = netlbl_unlabel_accept,
1384 .cmd = NLBL_UNLABEL_C_LIST,
1386 .policy = netlbl_unlabel_genl_policy,
1387 .doit = netlbl_unlabel_list,
1393 * NetLabel Generic NETLINK Protocol Functions
1397 * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
1400 * Register the unlabeled packet NetLabel component with the Generic NETLINK
1401 * mechanism. Returns zero on success, negative values on failure.
1404 int __init netlbl_unlabel_genl_init(void)
1406 return genl_register_family_with_ops(&netlbl_unlabel_gnl_family,
1407 netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops));
1411 * NetLabel KAPI Hooks
1414 static struct notifier_block netlbl_unlhsh_netdev_notifier = {
1415 .notifier_call = netlbl_unlhsh_netdev_handler,
1419 * netlbl_unlabel_init - Initialize the unlabeled connection hash table
1420 * @size: the number of bits to use for the hash buckets
1423 * Initializes the unlabeled connection hash table and registers a network
1424 * device notification handler. This function should only be called by the
1425 * NetLabel subsystem itself during initialization. Returns zero on success,
1426 * non-zero values on error.
1429 int __init netlbl_unlabel_init(u32 size)
1432 struct netlbl_unlhsh_tbl *hsh_tbl;
1437 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
1438 if (hsh_tbl == NULL)
1440 hsh_tbl->size = 1 << size;
1441 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
1442 sizeof(struct list_head),
1444 if (hsh_tbl->tbl == NULL) {
1448 for (iter = 0; iter < hsh_tbl->size; iter++)
1449 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
1452 spin_lock(&netlbl_unlhsh_lock);
1453 rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
1454 spin_unlock(&netlbl_unlhsh_lock);
1457 register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
1463 * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
1465 * @family: protocol family
1466 * @secattr: the security attributes
1469 * Determine the security attributes, if any, for an unlabled packet and return
1470 * them in @secattr. Returns zero on success and negative values on failure.
1473 int netlbl_unlabel_getattr(const struct sk_buff *skb,
1475 struct netlbl_lsm_secattr *secattr)
1477 struct netlbl_unlhsh_iface *iface;
1480 iface = netlbl_unlhsh_search_iface(skb->skb_iif);
1482 iface = rcu_dereference(netlbl_unlhsh_def);
1483 if (iface == NULL || !iface->valid)
1484 goto unlabel_getattr_nolabel;
1488 struct netlbl_af4list *addr4;
1491 addr4 = netlbl_af4list_search(hdr4->saddr,
1492 &iface->addr4_list);
1494 goto unlabel_getattr_nolabel;
1495 secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
1498 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1500 struct ipv6hdr *hdr6;
1501 struct netlbl_af6list *addr6;
1503 hdr6 = ipv6_hdr(skb);
1504 addr6 = netlbl_af6list_search(&hdr6->saddr,
1505 &iface->addr6_list);
1507 goto unlabel_getattr_nolabel;
1508 secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
1513 goto unlabel_getattr_nolabel;
1517 secattr->flags |= NETLBL_SECATTR_SECID;
1518 secattr->type = NETLBL_NLTYPE_UNLABELED;
1521 unlabel_getattr_nolabel:
1523 if (netlabel_unlabel_acceptflg == 0)
1525 secattr->type = NETLBL_NLTYPE_UNLABELED;
1530 * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
1533 * Set the default NetLabel configuration to allow incoming unlabeled packets
1534 * and to send unlabeled network traffic by default.
1537 int __init netlbl_unlabel_defconf(void)
1540 struct netlbl_dom_map *entry;
1541 struct netlbl_audit audit_info;
1543 /* Only the kernel is allowed to call this function and the only time
1544 * it is called is at bootup before the audit subsystem is reporting
1545 * messages so don't worry to much about these values. */
1546 security_task_getsecid(current, &audit_info.secid);
1547 audit_info.loginuid = 0;
1548 audit_info.sessionid = 0;
1550 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1553 entry->type = NETLBL_NLTYPE_UNLABELED;
1554 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
1558 netlbl_unlabel_acceptflg_set(1, &audit_info);