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, 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/socket.h>
33 #include <linux/string.h>
34 #include <linux/skbuff.h>
36 #include <linux/in6.h>
38 #include <net/netlink.h>
39 #include <net/genetlink.h>
42 #include <net/netlabel.h>
43 #include <net/cipso_ipv4.h>
44 #include <asm/atomic.h>
46 #include "netlabel_domainhash.h"
47 #include "netlabel_user.h"
48 #include "netlabel_mgmt.h"
50 /* NetLabel configured protocol counter */
51 atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
53 /* Argument struct for netlbl_domhsh_walk() */
54 struct netlbl_domhsh_walk_arg {
55 struct netlink_callback *nl_cb;
60 /* NetLabel Generic NETLINK CIPSOv4 family */
61 static struct genl_family netlbl_mgmt_gnl_family = {
62 .id = GENL_ID_GENERATE,
64 .name = NETLBL_NLTYPE_MGMT_NAME,
65 .version = NETLBL_PROTO_VERSION,
66 .maxattr = NLBL_MGMT_A_MAX,
69 /* NetLabel Netlink attribute policy */
70 static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
71 [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
72 [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
73 [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
74 [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
82 * netlbl_mgmt_add - Handle an ADD message
83 * @info: the Generic NETLINK info block
84 * @audit_info: NetLabel audit information
87 * Helper function for the ADD and ADDDEF messages to add the domain mappings
88 * from the message to the hash table. See netlabel.h for a description of the
89 * message format. Returns zero on success, negative values on failure.
92 static int netlbl_mgmt_add_common(struct genl_info *info,
93 struct netlbl_audit *audit_info)
95 int ret_val = -EINVAL;
96 struct netlbl_dom_map *entry = NULL;
97 struct netlbl_domaddr_map *addrmap = NULL;
98 struct cipso_v4_doi *cipsov4 = NULL;
101 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
106 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
107 if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
108 size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
109 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
110 if (entry->domain == NULL) {
114 nla_strlcpy(entry->domain,
115 info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
118 /* NOTE: internally we allow/use a entry->type value of
119 * NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
120 * to pass that as a protocol value because we need to know the
123 switch (entry->type) {
124 case NETLBL_NLTYPE_UNLABELED:
126 case NETLBL_NLTYPE_CIPSOV4:
127 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
130 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
131 cipsov4 = cipso_v4_doi_getdef(tmp_val);
134 entry->type_def.cipsov4 = cipsov4;
140 if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
141 struct in_addr *addr;
142 struct in_addr *mask;
143 struct netlbl_domaddr4_map *map;
145 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
146 if (addrmap == NULL) {
150 INIT_LIST_HEAD(&addrmap->list4);
151 INIT_LIST_HEAD(&addrmap->list6);
153 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
154 sizeof(struct in_addr)) {
158 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
159 sizeof(struct in_addr)) {
163 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
164 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
166 map = kzalloc(sizeof(*map), GFP_KERNEL);
171 map->list.addr = addr->s_addr & mask->s_addr;
172 map->list.mask = mask->s_addr;
174 map->type = entry->type;
176 map->type_def.cipsov4 = cipsov4;
178 ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
184 entry->type = NETLBL_NLTYPE_ADDRSELECT;
185 entry->type_def.addrsel = addrmap;
186 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
187 } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
188 struct in6_addr *addr;
189 struct in6_addr *mask;
190 struct netlbl_domaddr6_map *map;
192 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
193 if (addrmap == NULL) {
197 INIT_LIST_HEAD(&addrmap->list4);
198 INIT_LIST_HEAD(&addrmap->list6);
200 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
201 sizeof(struct in6_addr)) {
205 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
206 sizeof(struct in6_addr)) {
210 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
211 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
213 map = kzalloc(sizeof(*map), GFP_KERNEL);
218 ipv6_addr_copy(&map->list.addr, addr);
219 map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
220 map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
221 map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
222 map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
223 ipv6_addr_copy(&map->list.mask, mask);
225 map->type = entry->type;
227 ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
233 entry->type = NETLBL_NLTYPE_ADDRSELECT;
234 entry->type_def.addrsel = addrmap;
238 ret_val = netlbl_domhsh_add(entry, audit_info);
246 cipso_v4_doi_putdef(cipsov4);
248 kfree(entry->domain);
255 * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
256 * @skb: the NETLINK buffer
257 * @entry: the map entry
260 * This function is a helper function used by the LISTALL and LISTDEF command
261 * handlers. The caller is responsibile for ensuring that the RCU read lock
262 * is held. Returns zero on success, negative values on failure.
265 static int netlbl_mgmt_listentry(struct sk_buff *skb,
266 struct netlbl_dom_map *entry)
269 struct nlattr *nla_a;
270 struct nlattr *nla_b;
271 struct netlbl_af4list *iter4;
272 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
273 struct netlbl_af6list *iter6;
276 if (entry->domain != NULL) {
277 ret_val = nla_put_string(skb,
278 NLBL_MGMT_A_DOMAIN, entry->domain);
283 switch (entry->type) {
284 case NETLBL_NLTYPE_ADDRSELECT:
285 nla_a = nla_nest_start(skb, NLBL_MGMT_A_SELECTORLIST);
289 netlbl_af4list_foreach_rcu(iter4,
290 &entry->type_def.addrsel->list4) {
291 struct netlbl_domaddr4_map *map4;
292 struct in_addr addr_struct;
294 nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
298 addr_struct.s_addr = iter4->addr;
299 ret_val = nla_put(skb, NLBL_MGMT_A_IPV4ADDR,
300 sizeof(struct in_addr),
304 addr_struct.s_addr = iter4->mask;
305 ret_val = nla_put(skb, NLBL_MGMT_A_IPV4MASK,
306 sizeof(struct in_addr),
310 map4 = netlbl_domhsh_addr4_entry(iter4);
311 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
315 switch (map4->type) {
316 case NETLBL_NLTYPE_CIPSOV4:
317 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
318 map4->type_def.cipsov4->doi);
324 nla_nest_end(skb, nla_b);
326 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
327 netlbl_af6list_foreach_rcu(iter6,
328 &entry->type_def.addrsel->list6) {
329 struct netlbl_domaddr6_map *map6;
331 nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
335 ret_val = nla_put(skb, NLBL_MGMT_A_IPV6ADDR,
336 sizeof(struct in6_addr),
340 ret_val = nla_put(skb, NLBL_MGMT_A_IPV6MASK,
341 sizeof(struct in6_addr),
345 map6 = netlbl_domhsh_addr6_entry(iter6);
346 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
351 nla_nest_end(skb, nla_b);
355 nla_nest_end(skb, nla_a);
357 case NETLBL_NLTYPE_UNLABELED:
358 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, entry->type);
360 case NETLBL_NLTYPE_CIPSOV4:
361 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, entry->type);
364 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
365 entry->type_def.cipsov4->doi);
373 * NetLabel Command Handlers
377 * netlbl_mgmt_add - Handle an ADD message
378 * @skb: the NETLINK buffer
379 * @info: the Generic NETLINK info block
382 * Process a user generated ADD message and add the domains from the message
383 * to the hash table. See netlabel.h for a description of the message format.
384 * Returns zero on success, negative values on failure.
387 static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
389 struct netlbl_audit audit_info;
391 if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
392 (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
393 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
394 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
395 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
396 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
397 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
398 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
399 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
400 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
403 netlbl_netlink_auditinfo(skb, &audit_info);
405 return netlbl_mgmt_add_common(info, &audit_info);
409 * netlbl_mgmt_remove - Handle a REMOVE message
410 * @skb: the NETLINK buffer
411 * @info: the Generic NETLINK info block
414 * Process a user generated REMOVE message and remove the specified domain
415 * mappings. Returns zero on success, negative values on failure.
418 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
421 struct netlbl_audit audit_info;
423 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
426 netlbl_netlink_auditinfo(skb, &audit_info);
428 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
429 return netlbl_domhsh_remove(domain, &audit_info);
433 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
434 * @entry: the domain mapping hash table entry
435 * @arg: the netlbl_domhsh_walk_arg structure
438 * This function is designed to be used as a callback to the
439 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
440 * message. Returns the size of the message on success, negative values on
444 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
446 int ret_val = -ENOMEM;
447 struct netlbl_domhsh_walk_arg *cb_arg = arg;
450 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
451 cb_arg->seq, &netlbl_mgmt_gnl_family,
452 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
454 goto listall_cb_failure;
456 ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
458 goto listall_cb_failure;
461 return genlmsg_end(cb_arg->skb, data);
464 genlmsg_cancel(cb_arg->skb, data);
469 * netlbl_mgmt_listall - Handle a LISTALL message
470 * @skb: the NETLINK buffer
471 * @cb: the NETLINK callback
474 * Process a user generated LISTALL message and dumps the domain hash table in
475 * a form suitable for use in a kernel generated LISTALL message. Returns zero
476 * on success, negative values on failure.
479 static int netlbl_mgmt_listall(struct sk_buff *skb,
480 struct netlink_callback *cb)
482 struct netlbl_domhsh_walk_arg cb_arg;
483 u32 skip_bkt = cb->args[0];
484 u32 skip_chain = cb->args[1];
488 cb_arg.seq = cb->nlh->nlmsg_seq;
490 netlbl_domhsh_walk(&skip_bkt,
492 netlbl_mgmt_listall_cb,
495 cb->args[0] = skip_bkt;
496 cb->args[1] = skip_chain;
501 * netlbl_mgmt_adddef - Handle an ADDDEF message
502 * @skb: the NETLINK buffer
503 * @info: the Generic NETLINK info block
506 * Process a user generated ADDDEF message and respond accordingly. Returns
507 * zero on success, negative values on failure.
510 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
512 struct netlbl_audit audit_info;
514 if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
515 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
516 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
517 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
518 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
519 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
520 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
521 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
522 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
525 netlbl_netlink_auditinfo(skb, &audit_info);
527 return netlbl_mgmt_add_common(info, &audit_info);
531 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
532 * @skb: the NETLINK buffer
533 * @info: the Generic NETLINK info block
536 * Process a user generated REMOVEDEF message and remove the default domain
537 * mapping. Returns zero on success, negative values on failure.
540 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
542 struct netlbl_audit audit_info;
544 netlbl_netlink_auditinfo(skb, &audit_info);
546 return netlbl_domhsh_remove_default(&audit_info);
550 * netlbl_mgmt_listdef - Handle a LISTDEF message
551 * @skb: the NETLINK buffer
552 * @info: the Generic NETLINK info block
555 * Process a user generated LISTDEF message and dumps the default domain
556 * mapping in a form suitable for use in a kernel generated LISTDEF message.
557 * Returns zero on success, negative values on failure.
560 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
562 int ret_val = -ENOMEM;
563 struct sk_buff *ans_skb = NULL;
565 struct netlbl_dom_map *entry;
567 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
570 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
571 0, NLBL_MGMT_C_LISTDEF);
573 goto listdef_failure;
576 entry = netlbl_domhsh_getentry(NULL);
579 goto listdef_failure_lock;
581 ret_val = netlbl_mgmt_listentry(ans_skb, entry);
584 goto listdef_failure;
586 genlmsg_end(ans_skb, data);
587 return genlmsg_reply(ans_skb, info);
589 listdef_failure_lock:
597 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
598 * @skb: the skb to write to
599 * @cb: the NETLINK callback
600 * @protocol: the NetLabel protocol to use in the message
603 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
604 * answer a application's PROTOCOLS message. Returns the size of the message
605 * on success, negative values on failure.
608 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
609 struct netlink_callback *cb,
612 int ret_val = -ENOMEM;
615 data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
616 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
617 NLBL_MGMT_C_PROTOCOLS);
619 goto protocols_cb_failure;
621 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
623 goto protocols_cb_failure;
625 return genlmsg_end(skb, data);
627 protocols_cb_failure:
628 genlmsg_cancel(skb, data);
633 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
634 * @skb: the NETLINK buffer
635 * @cb: the NETLINK callback
638 * Process a user generated PROTOCOLS message and respond accordingly.
641 static int netlbl_mgmt_protocols(struct sk_buff *skb,
642 struct netlink_callback *cb)
644 u32 protos_sent = cb->args[0];
646 if (protos_sent == 0) {
647 if (netlbl_mgmt_protocols_cb(skb,
649 NETLBL_NLTYPE_UNLABELED) < 0)
650 goto protocols_return;
653 if (protos_sent == 1) {
654 if (netlbl_mgmt_protocols_cb(skb,
656 NETLBL_NLTYPE_CIPSOV4) < 0)
657 goto protocols_return;
662 cb->args[0] = protos_sent;
667 * netlbl_mgmt_version - Handle a VERSION message
668 * @skb: the NETLINK buffer
669 * @info: the Generic NETLINK info block
672 * Process a user generated VERSION message and respond accordingly. Returns
673 * zero on success, negative values on failure.
676 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
678 int ret_val = -ENOMEM;
679 struct sk_buff *ans_skb = NULL;
682 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
685 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
686 0, NLBL_MGMT_C_VERSION);
688 goto version_failure;
690 ret_val = nla_put_u32(ans_skb,
692 NETLBL_PROTO_VERSION);
694 goto version_failure;
696 genlmsg_end(ans_skb, data);
697 return genlmsg_reply(ans_skb, info);
706 * NetLabel Generic NETLINK Command Definitions
709 static struct genl_ops netlbl_mgmt_genl_ops[] = {
711 .cmd = NLBL_MGMT_C_ADD,
712 .flags = GENL_ADMIN_PERM,
713 .policy = netlbl_mgmt_genl_policy,
714 .doit = netlbl_mgmt_add,
718 .cmd = NLBL_MGMT_C_REMOVE,
719 .flags = GENL_ADMIN_PERM,
720 .policy = netlbl_mgmt_genl_policy,
721 .doit = netlbl_mgmt_remove,
725 .cmd = NLBL_MGMT_C_LISTALL,
727 .policy = netlbl_mgmt_genl_policy,
729 .dumpit = netlbl_mgmt_listall,
732 .cmd = NLBL_MGMT_C_ADDDEF,
733 .flags = GENL_ADMIN_PERM,
734 .policy = netlbl_mgmt_genl_policy,
735 .doit = netlbl_mgmt_adddef,
739 .cmd = NLBL_MGMT_C_REMOVEDEF,
740 .flags = GENL_ADMIN_PERM,
741 .policy = netlbl_mgmt_genl_policy,
742 .doit = netlbl_mgmt_removedef,
746 .cmd = NLBL_MGMT_C_LISTDEF,
748 .policy = netlbl_mgmt_genl_policy,
749 .doit = netlbl_mgmt_listdef,
753 .cmd = NLBL_MGMT_C_PROTOCOLS,
755 .policy = netlbl_mgmt_genl_policy,
757 .dumpit = netlbl_mgmt_protocols,
760 .cmd = NLBL_MGMT_C_VERSION,
762 .policy = netlbl_mgmt_genl_policy,
763 .doit = netlbl_mgmt_version,
769 * NetLabel Generic NETLINK Protocol Functions
773 * netlbl_mgmt_genl_init - Register the NetLabel management component
776 * Register the NetLabel management component with the Generic NETLINK
777 * mechanism. Returns zero on success, negative values on failure.
780 int __init netlbl_mgmt_genl_init(void)
782 return genl_register_family_with_ops(&netlbl_mgmt_gnl_family,
783 netlbl_mgmt_genl_ops, ARRAY_SIZE(netlbl_mgmt_genl_ops));