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 /* Argument struct for netlbl_domhsh_walk() */
46 struct netlbl_domhsh_walk_arg {
47 struct netlink_callback *nl_cb;
52 /* NetLabel Generic NETLINK CIPSOv4 family */
53 static struct genl_family netlbl_mgmt_gnl_family = {
54 .id = GENL_ID_GENERATE,
56 .name = NETLBL_NLTYPE_MGMT_NAME,
57 .version = NETLBL_PROTO_VERSION,
58 .maxattr = NLBL_MGMT_A_MAX,
61 /* NetLabel Netlink attribute policy */
62 static struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
63 [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
64 [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
65 [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
66 [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
70 * NetLabel Command Handlers
74 * netlbl_mgmt_add - Handle an ADD message
75 * @skb: the NETLINK buffer
76 * @info: the Generic NETLINK info block
79 * Process a user generated ADD message and add the domains from the message
80 * to the hash table. See netlabel.h for a description of the message format.
81 * Returns zero on success, negative values on failure.
84 static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
86 int ret_val = -EINVAL;
87 struct netlbl_dom_map *entry = NULL;
90 struct netlbl_audit audit_info;
92 if (!info->attrs[NLBL_MGMT_A_DOMAIN] ||
93 !info->attrs[NLBL_MGMT_A_PROTOCOL])
96 netlbl_netlink_auditinfo(skb, &audit_info);
98 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
103 tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
104 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
105 if (entry->domain == NULL) {
109 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
110 nla_strlcpy(entry->domain, info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
112 switch (entry->type) {
113 case NETLBL_NLTYPE_UNLABELED:
114 ret_val = netlbl_domhsh_add(entry, &audit_info);
116 case NETLBL_NLTYPE_CIPSOV4:
117 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
120 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
121 /* We should be holding a rcu_read_lock() here while we hold
122 * the result but since the entry will always be deleted when
123 * the CIPSO DOI is deleted we aren't going to keep the
126 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
127 if (entry->type_def.cipsov4 == NULL) {
131 ret_val = netlbl_domhsh_add(entry, &audit_info);
144 kfree(entry->domain);
150 * netlbl_mgmt_remove - Handle a REMOVE message
151 * @skb: the NETLINK buffer
152 * @info: the Generic NETLINK info block
155 * Process a user generated REMOVE message and remove the specified domain
156 * mappings. Returns zero on success, negative values on failure.
159 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
162 struct netlbl_audit audit_info;
164 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
167 netlbl_netlink_auditinfo(skb, &audit_info);
169 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
170 return netlbl_domhsh_remove(domain, &audit_info);
174 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
175 * @entry: the domain mapping hash table entry
176 * @arg: the netlbl_domhsh_walk_arg structure
179 * This function is designed to be used as a callback to the
180 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
181 * message. Returns the size of the message on success, negative values on
185 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
187 int ret_val = -ENOMEM;
188 struct netlbl_domhsh_walk_arg *cb_arg = arg;
191 data = netlbl_netlink_hdr_put(cb_arg->skb,
192 NETLINK_CB(cb_arg->nl_cb->skb).pid,
194 netlbl_mgmt_gnl_family.id,
196 NLBL_MGMT_C_LISTALL);
198 goto listall_cb_failure;
200 ret_val = nla_put_string(cb_arg->skb,
204 goto listall_cb_failure;
205 ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
207 goto listall_cb_failure;
208 switch (entry->type) {
209 case NETLBL_NLTYPE_CIPSOV4:
210 ret_val = nla_put_u32(cb_arg->skb,
212 entry->type_def.cipsov4->doi);
214 goto listall_cb_failure;
219 return genlmsg_end(cb_arg->skb, data);
222 genlmsg_cancel(cb_arg->skb, data);
227 * netlbl_mgmt_listall - Handle a LISTALL message
228 * @skb: the NETLINK buffer
229 * @cb: the NETLINK callback
232 * Process a user generated LISTALL message and dumps the domain hash table in
233 * a form suitable for use in a kernel generated LISTALL message. Returns zero
234 * on success, negative values on failure.
237 static int netlbl_mgmt_listall(struct sk_buff *skb,
238 struct netlink_callback *cb)
240 struct netlbl_domhsh_walk_arg cb_arg;
241 u32 skip_bkt = cb->args[0];
242 u32 skip_chain = cb->args[1];
246 cb_arg.seq = cb->nlh->nlmsg_seq;
248 netlbl_domhsh_walk(&skip_bkt,
250 netlbl_mgmt_listall_cb,
253 cb->args[0] = skip_bkt;
254 cb->args[1] = skip_chain;
259 * netlbl_mgmt_adddef - Handle an ADDDEF message
260 * @skb: the NETLINK buffer
261 * @info: the Generic NETLINK info block
264 * Process a user generated ADDDEF message and respond accordingly. Returns
265 * zero on success, negative values on failure.
268 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
270 int ret_val = -EINVAL;
271 struct netlbl_dom_map *entry = NULL;
273 struct netlbl_audit audit_info;
275 if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
278 netlbl_netlink_auditinfo(skb, &audit_info);
280 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
285 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
287 switch (entry->type) {
288 case NETLBL_NLTYPE_UNLABELED:
289 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
291 case NETLBL_NLTYPE_CIPSOV4:
292 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
295 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
296 /* We should be holding a rcu_read_lock() here while we hold
297 * the result but since the entry will always be deleted when
298 * the CIPSO DOI is deleted we aren't going to keep the
301 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
302 if (entry->type_def.cipsov4 == NULL) {
306 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
323 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
324 * @skb: the NETLINK buffer
325 * @info: the Generic NETLINK info block
328 * Process a user generated REMOVEDEF message and remove the default domain
329 * mapping. Returns zero on success, negative values on failure.
332 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
334 struct netlbl_audit audit_info;
336 netlbl_netlink_auditinfo(skb, &audit_info);
338 return netlbl_domhsh_remove_default(&audit_info);
342 * netlbl_mgmt_listdef - Handle a LISTDEF message
343 * @skb: the NETLINK buffer
344 * @info: the Generic NETLINK info block
347 * Process a user generated LISTDEF message and dumps the default domain
348 * mapping in a form suitable for use in a kernel generated LISTDEF message.
349 * Returns zero on success, negative values on failure.
352 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
354 int ret_val = -ENOMEM;
355 struct sk_buff *ans_skb = NULL;
357 struct netlbl_dom_map *entry;
359 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
362 data = netlbl_netlink_hdr_put(ans_skb,
365 netlbl_mgmt_gnl_family.id,
367 NLBL_MGMT_C_LISTDEF);
369 goto listdef_failure;
372 entry = netlbl_domhsh_getentry(NULL);
375 goto listdef_failure_lock;
377 ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
379 goto listdef_failure_lock;
380 switch (entry->type) {
381 case NETLBL_NLTYPE_CIPSOV4:
382 ret_val = nla_put_u32(ans_skb,
384 entry->type_def.cipsov4->doi);
386 goto listdef_failure_lock;
391 genlmsg_end(ans_skb, data);
393 ret_val = genlmsg_unicast(ans_skb, info->snd_pid);
395 goto listdef_failure;
398 listdef_failure_lock:
406 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
407 * @skb: the skb to write to
408 * @seq: the NETLINK sequence number
409 * @cb: the NETLINK callback
410 * @protocol: the NetLabel protocol to use in the message
413 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
414 * answer a application's PROTOCOLS message. Returns the size of the message
415 * on success, negative values on failure.
418 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
419 struct netlink_callback *cb,
422 int ret_val = -ENOMEM;
425 data = netlbl_netlink_hdr_put(skb,
426 NETLINK_CB(cb->skb).pid,
428 netlbl_mgmt_gnl_family.id,
430 NLBL_MGMT_C_PROTOCOLS);
432 goto protocols_cb_failure;
434 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
436 goto protocols_cb_failure;
438 return genlmsg_end(skb, data);
440 protocols_cb_failure:
441 genlmsg_cancel(skb, data);
446 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
447 * @skb: the NETLINK buffer
448 * @cb: the NETLINK callback
451 * Process a user generated PROTOCOLS message and respond accordingly.
454 static int netlbl_mgmt_protocols(struct sk_buff *skb,
455 struct netlink_callback *cb)
457 u32 protos_sent = cb->args[0];
459 if (protos_sent == 0) {
460 if (netlbl_mgmt_protocols_cb(skb,
462 NETLBL_NLTYPE_UNLABELED) < 0)
463 goto protocols_return;
466 if (protos_sent == 1) {
467 if (netlbl_mgmt_protocols_cb(skb,
469 NETLBL_NLTYPE_CIPSOV4) < 0)
470 goto protocols_return;
475 cb->args[0] = protos_sent;
480 * netlbl_mgmt_version - Handle a VERSION message
481 * @skb: the NETLINK buffer
482 * @info: the Generic NETLINK info block
485 * Process a user generated VERSION message and respond accordingly. Returns
486 * zero on success, negative values on failure.
489 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
491 int ret_val = -ENOMEM;
492 struct sk_buff *ans_skb = NULL;
495 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
498 data = netlbl_netlink_hdr_put(ans_skb,
501 netlbl_mgmt_gnl_family.id,
503 NLBL_MGMT_C_VERSION);
505 goto version_failure;
507 ret_val = nla_put_u32(ans_skb,
509 NETLBL_PROTO_VERSION);
511 goto version_failure;
513 genlmsg_end(ans_skb, data);
515 ret_val = genlmsg_unicast(ans_skb, info->snd_pid);
517 goto version_failure;
527 * NetLabel Generic NETLINK Command Definitions
530 static struct genl_ops netlbl_mgmt_genl_c_add = {
531 .cmd = NLBL_MGMT_C_ADD,
532 .flags = GENL_ADMIN_PERM,
533 .policy = netlbl_mgmt_genl_policy,
534 .doit = netlbl_mgmt_add,
538 static struct genl_ops netlbl_mgmt_genl_c_remove = {
539 .cmd = NLBL_MGMT_C_REMOVE,
540 .flags = GENL_ADMIN_PERM,
541 .policy = netlbl_mgmt_genl_policy,
542 .doit = netlbl_mgmt_remove,
546 static struct genl_ops netlbl_mgmt_genl_c_listall = {
547 .cmd = NLBL_MGMT_C_LISTALL,
549 .policy = netlbl_mgmt_genl_policy,
551 .dumpit = netlbl_mgmt_listall,
554 static struct genl_ops netlbl_mgmt_genl_c_adddef = {
555 .cmd = NLBL_MGMT_C_ADDDEF,
556 .flags = GENL_ADMIN_PERM,
557 .policy = netlbl_mgmt_genl_policy,
558 .doit = netlbl_mgmt_adddef,
562 static struct genl_ops netlbl_mgmt_genl_c_removedef = {
563 .cmd = NLBL_MGMT_C_REMOVEDEF,
564 .flags = GENL_ADMIN_PERM,
565 .policy = netlbl_mgmt_genl_policy,
566 .doit = netlbl_mgmt_removedef,
570 static struct genl_ops netlbl_mgmt_genl_c_listdef = {
571 .cmd = NLBL_MGMT_C_LISTDEF,
573 .policy = netlbl_mgmt_genl_policy,
574 .doit = netlbl_mgmt_listdef,
578 static struct genl_ops netlbl_mgmt_genl_c_protocols = {
579 .cmd = NLBL_MGMT_C_PROTOCOLS,
581 .policy = netlbl_mgmt_genl_policy,
583 .dumpit = netlbl_mgmt_protocols,
586 static struct genl_ops netlbl_mgmt_genl_c_version = {
587 .cmd = NLBL_MGMT_C_VERSION,
589 .policy = netlbl_mgmt_genl_policy,
590 .doit = netlbl_mgmt_version,
595 * NetLabel Generic NETLINK Protocol Functions
599 * netlbl_mgmt_genl_init - Register the NetLabel management component
602 * Register the NetLabel management component with the Generic NETLINK
603 * mechanism. Returns zero on success, negative values on failure.
606 int netlbl_mgmt_genl_init(void)
610 ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
614 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
615 &netlbl_mgmt_genl_c_add);
618 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
619 &netlbl_mgmt_genl_c_remove);
622 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
623 &netlbl_mgmt_genl_c_listall);
626 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
627 &netlbl_mgmt_genl_c_adddef);
630 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
631 &netlbl_mgmt_genl_c_removedef);
634 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
635 &netlbl_mgmt_genl_c_listdef);
638 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
639 &netlbl_mgmt_genl_c_protocols);
642 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
643 &netlbl_mgmt_genl_c_version);