2 * NetLabel Management Support
4 * This file defines the management functions for the NetLabel system. The
5 * NetLabel system manages static and dynamic label mappings for network
6 * protocols such as CIPSO and RIPSO.
8 * Author: Paul Moore <paul.moore@hp.com>
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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/socket.h>
33 #include <linux/string.h>
34 #include <linux/skbuff.h>
36 #include <net/netlink.h>
37 #include <net/genetlink.h>
38 #include <net/netlabel.h>
39 #include <net/cipso_ipv4.h>
41 #include "netlabel_domainhash.h"
42 #include "netlabel_user.h"
43 #include "netlabel_mgmt.h"
45 /* NetLabel configured protocol count */
46 static DEFINE_SPINLOCK(netlabel_mgmt_protocount_lock);
47 static u32 netlabel_mgmt_protocount = 0;
49 /* Argument struct for netlbl_domhsh_walk() */
50 struct netlbl_domhsh_walk_arg {
51 struct netlink_callback *nl_cb;
56 /* NetLabel Generic NETLINK CIPSOv4 family */
57 static struct genl_family netlbl_mgmt_gnl_family = {
58 .id = GENL_ID_GENERATE,
60 .name = NETLBL_NLTYPE_MGMT_NAME,
61 .version = NETLBL_PROTO_VERSION,
62 .maxattr = NLBL_MGMT_A_MAX,
65 /* NetLabel Netlink attribute policy */
66 static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
67 [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
68 [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
69 [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
70 [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
74 * NetLabel Misc Managment Functions
78 * netlbl_mgmt_protocount_inc - Increment the configured labeled protocol count
81 * Increment the number of labeled protocol configurations in the current
82 * NetLabel configuration. Keep track of this for use in determining if
83 * NetLabel label enforcement should be active/enabled or not in the LSM.
86 void netlbl_mgmt_protocount_inc(void)
89 spin_lock(&netlabel_mgmt_protocount_lock);
90 netlabel_mgmt_protocount++;
91 spin_unlock(&netlabel_mgmt_protocount_lock);
96 * netlbl_mgmt_protocount_dec - Decrement the configured labeled protocol count
99 * Decrement the number of labeled protocol configurations in the current
100 * NetLabel configuration. Keep track of this for use in determining if
101 * NetLabel label enforcement should be active/enabled or not in the LSM.
104 void netlbl_mgmt_protocount_dec(void)
107 spin_lock(&netlabel_mgmt_protocount_lock);
108 if (netlabel_mgmt_protocount > 0)
109 netlabel_mgmt_protocount--;
110 spin_unlock(&netlabel_mgmt_protocount_lock);
115 * netlbl_mgmt_protocount_value - Return the number of configured protocols
118 * Return the number of labeled protocols in the current NetLabel
119 * configuration. This value is useful in determining if NetLabel label
120 * enforcement should be active/enabled or not in the LSM.
123 u32 netlbl_mgmt_protocount_value(void)
128 val = netlabel_mgmt_protocount;
135 * NetLabel Command Handlers
139 * netlbl_mgmt_add - Handle an ADD message
140 * @skb: the NETLINK buffer
141 * @info: the Generic NETLINK info block
144 * Process a user generated ADD message and add the domains from the message
145 * to the hash table. See netlabel.h for a description of the message format.
146 * Returns zero on success, negative values on failure.
149 static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
151 int ret_val = -EINVAL;
152 struct netlbl_dom_map *entry = NULL;
155 struct netlbl_audit audit_info;
157 if (!info->attrs[NLBL_MGMT_A_DOMAIN] ||
158 !info->attrs[NLBL_MGMT_A_PROTOCOL])
161 netlbl_netlink_auditinfo(skb, &audit_info);
163 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
168 tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
169 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
170 if (entry->domain == NULL) {
174 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
175 nla_strlcpy(entry->domain, info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
177 switch (entry->type) {
178 case NETLBL_NLTYPE_UNLABELED:
179 ret_val = netlbl_domhsh_add(entry, &audit_info);
181 case NETLBL_NLTYPE_CIPSOV4:
182 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
185 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
186 /* We should be holding a rcu_read_lock() here while we hold
187 * the result but since the entry will always be deleted when
188 * the CIPSO DOI is deleted we aren't going to keep the
191 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
192 if (entry->type_def.cipsov4 == NULL) {
196 ret_val = netlbl_domhsh_add(entry, &audit_info);
209 kfree(entry->domain);
215 * netlbl_mgmt_remove - Handle a REMOVE message
216 * @skb: the NETLINK buffer
217 * @info: the Generic NETLINK info block
220 * Process a user generated REMOVE message and remove the specified domain
221 * mappings. Returns zero on success, negative values on failure.
224 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
227 struct netlbl_audit audit_info;
229 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
232 netlbl_netlink_auditinfo(skb, &audit_info);
234 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
235 return netlbl_domhsh_remove(domain, &audit_info);
239 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
240 * @entry: the domain mapping hash table entry
241 * @arg: the netlbl_domhsh_walk_arg structure
244 * This function is designed to be used as a callback to the
245 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
246 * message. Returns the size of the message on success, negative values on
250 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
252 int ret_val = -ENOMEM;
253 struct netlbl_domhsh_walk_arg *cb_arg = arg;
256 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
257 cb_arg->seq, &netlbl_mgmt_gnl_family,
258 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
260 goto listall_cb_failure;
262 ret_val = nla_put_string(cb_arg->skb,
266 goto listall_cb_failure;
267 ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
269 goto listall_cb_failure;
270 switch (entry->type) {
271 case NETLBL_NLTYPE_CIPSOV4:
272 ret_val = nla_put_u32(cb_arg->skb,
274 entry->type_def.cipsov4->doi);
276 goto listall_cb_failure;
281 return genlmsg_end(cb_arg->skb, data);
284 genlmsg_cancel(cb_arg->skb, data);
289 * netlbl_mgmt_listall - Handle a LISTALL message
290 * @skb: the NETLINK buffer
291 * @cb: the NETLINK callback
294 * Process a user generated LISTALL message and dumps the domain hash table in
295 * a form suitable for use in a kernel generated LISTALL message. Returns zero
296 * on success, negative values on failure.
299 static int netlbl_mgmt_listall(struct sk_buff *skb,
300 struct netlink_callback *cb)
302 struct netlbl_domhsh_walk_arg cb_arg;
303 u32 skip_bkt = cb->args[0];
304 u32 skip_chain = cb->args[1];
308 cb_arg.seq = cb->nlh->nlmsg_seq;
310 netlbl_domhsh_walk(&skip_bkt,
312 netlbl_mgmt_listall_cb,
315 cb->args[0] = skip_bkt;
316 cb->args[1] = skip_chain;
321 * netlbl_mgmt_adddef - Handle an ADDDEF message
322 * @skb: the NETLINK buffer
323 * @info: the Generic NETLINK info block
326 * Process a user generated ADDDEF message and respond accordingly. Returns
327 * zero on success, negative values on failure.
330 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
332 int ret_val = -EINVAL;
333 struct netlbl_dom_map *entry = NULL;
335 struct netlbl_audit audit_info;
337 if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
340 netlbl_netlink_auditinfo(skb, &audit_info);
342 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
347 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
349 switch (entry->type) {
350 case NETLBL_NLTYPE_UNLABELED:
351 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
353 case NETLBL_NLTYPE_CIPSOV4:
354 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
357 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
358 /* We should be holding a rcu_read_lock() here while we hold
359 * the result but since the entry will always be deleted when
360 * the CIPSO DOI is deleted we aren't going to keep the
363 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
364 if (entry->type_def.cipsov4 == NULL) {
368 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
385 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
386 * @skb: the NETLINK buffer
387 * @info: the Generic NETLINK info block
390 * Process a user generated REMOVEDEF message and remove the default domain
391 * mapping. Returns zero on success, negative values on failure.
394 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
396 struct netlbl_audit audit_info;
398 netlbl_netlink_auditinfo(skb, &audit_info);
400 return netlbl_domhsh_remove_default(&audit_info);
404 * netlbl_mgmt_listdef - Handle a LISTDEF message
405 * @skb: the NETLINK buffer
406 * @info: the Generic NETLINK info block
409 * Process a user generated LISTDEF message and dumps the default domain
410 * mapping in a form suitable for use in a kernel generated LISTDEF message.
411 * Returns zero on success, negative values on failure.
414 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
416 int ret_val = -ENOMEM;
417 struct sk_buff *ans_skb = NULL;
419 struct netlbl_dom_map *entry;
421 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
424 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
425 0, NLBL_MGMT_C_LISTDEF);
427 goto listdef_failure;
430 entry = netlbl_domhsh_getentry(NULL);
433 goto listdef_failure_lock;
435 ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
437 goto listdef_failure_lock;
438 switch (entry->type) {
439 case NETLBL_NLTYPE_CIPSOV4:
440 ret_val = nla_put_u32(ans_skb,
442 entry->type_def.cipsov4->doi);
444 goto listdef_failure_lock;
449 genlmsg_end(ans_skb, data);
451 ret_val = genlmsg_reply(ans_skb, info);
453 goto listdef_failure;
456 listdef_failure_lock:
464 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
465 * @skb: the skb to write to
466 * @seq: the NETLINK sequence number
467 * @cb: the NETLINK callback
468 * @protocol: the NetLabel protocol to use in the message
471 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
472 * answer a application's PROTOCOLS message. Returns the size of the message
473 * on success, negative values on failure.
476 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
477 struct netlink_callback *cb,
480 int ret_val = -ENOMEM;
483 data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
484 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
485 NLBL_MGMT_C_PROTOCOLS);
487 goto protocols_cb_failure;
489 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
491 goto protocols_cb_failure;
493 return genlmsg_end(skb, data);
495 protocols_cb_failure:
496 genlmsg_cancel(skb, data);
501 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
502 * @skb: the NETLINK buffer
503 * @cb: the NETLINK callback
506 * Process a user generated PROTOCOLS message and respond accordingly.
509 static int netlbl_mgmt_protocols(struct sk_buff *skb,
510 struct netlink_callback *cb)
512 u32 protos_sent = cb->args[0];
514 if (protos_sent == 0) {
515 if (netlbl_mgmt_protocols_cb(skb,
517 NETLBL_NLTYPE_UNLABELED) < 0)
518 goto protocols_return;
521 if (protos_sent == 1) {
522 if (netlbl_mgmt_protocols_cb(skb,
524 NETLBL_NLTYPE_CIPSOV4) < 0)
525 goto protocols_return;
530 cb->args[0] = protos_sent;
535 * netlbl_mgmt_version - Handle a VERSION message
536 * @skb: the NETLINK buffer
537 * @info: the Generic NETLINK info block
540 * Process a user generated VERSION message and respond accordingly. Returns
541 * zero on success, negative values on failure.
544 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
546 int ret_val = -ENOMEM;
547 struct sk_buff *ans_skb = NULL;
550 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
553 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
554 0, NLBL_MGMT_C_VERSION);
556 goto version_failure;
558 ret_val = nla_put_u32(ans_skb,
560 NETLBL_PROTO_VERSION);
562 goto version_failure;
564 genlmsg_end(ans_skb, data);
566 ret_val = genlmsg_reply(ans_skb, info);
568 goto version_failure;
578 * NetLabel Generic NETLINK Command Definitions
581 static struct genl_ops netlbl_mgmt_genl_c_add = {
582 .cmd = NLBL_MGMT_C_ADD,
583 .flags = GENL_ADMIN_PERM,
584 .policy = netlbl_mgmt_genl_policy,
585 .doit = netlbl_mgmt_add,
589 static struct genl_ops netlbl_mgmt_genl_c_remove = {
590 .cmd = NLBL_MGMT_C_REMOVE,
591 .flags = GENL_ADMIN_PERM,
592 .policy = netlbl_mgmt_genl_policy,
593 .doit = netlbl_mgmt_remove,
597 static struct genl_ops netlbl_mgmt_genl_c_listall = {
598 .cmd = NLBL_MGMT_C_LISTALL,
600 .policy = netlbl_mgmt_genl_policy,
602 .dumpit = netlbl_mgmt_listall,
605 static struct genl_ops netlbl_mgmt_genl_c_adddef = {
606 .cmd = NLBL_MGMT_C_ADDDEF,
607 .flags = GENL_ADMIN_PERM,
608 .policy = netlbl_mgmt_genl_policy,
609 .doit = netlbl_mgmt_adddef,
613 static struct genl_ops netlbl_mgmt_genl_c_removedef = {
614 .cmd = NLBL_MGMT_C_REMOVEDEF,
615 .flags = GENL_ADMIN_PERM,
616 .policy = netlbl_mgmt_genl_policy,
617 .doit = netlbl_mgmt_removedef,
621 static struct genl_ops netlbl_mgmt_genl_c_listdef = {
622 .cmd = NLBL_MGMT_C_LISTDEF,
624 .policy = netlbl_mgmt_genl_policy,
625 .doit = netlbl_mgmt_listdef,
629 static struct genl_ops netlbl_mgmt_genl_c_protocols = {
630 .cmd = NLBL_MGMT_C_PROTOCOLS,
632 .policy = netlbl_mgmt_genl_policy,
634 .dumpit = netlbl_mgmt_protocols,
637 static struct genl_ops netlbl_mgmt_genl_c_version = {
638 .cmd = NLBL_MGMT_C_VERSION,
640 .policy = netlbl_mgmt_genl_policy,
641 .doit = netlbl_mgmt_version,
646 * NetLabel Generic NETLINK Protocol Functions
650 * netlbl_mgmt_genl_init - Register the NetLabel management component
653 * Register the NetLabel management component with the Generic NETLINK
654 * mechanism. Returns zero on success, negative values on failure.
657 int netlbl_mgmt_genl_init(void)
661 ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
665 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
666 &netlbl_mgmt_genl_c_add);
669 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
670 &netlbl_mgmt_genl_c_remove);
673 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
674 &netlbl_mgmt_genl_c_listall);
677 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
678 &netlbl_mgmt_genl_c_adddef);
681 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
682 &netlbl_mgmt_genl_c_removedef);
685 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
686 &netlbl_mgmt_genl_c_listdef);
689 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
690 &netlbl_mgmt_genl_c_protocols);
693 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
694 &netlbl_mgmt_genl_c_version);