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>
40 #include <asm/atomic.h>
42 #include "netlabel_domainhash.h"
43 #include "netlabel_user.h"
44 #include "netlabel_mgmt.h"
46 /* NetLabel configured protocol counter */
47 atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(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 Command Handlers
78 * netlbl_mgmt_add - Handle an ADD message
79 * @skb: the NETLINK buffer
80 * @info: the Generic NETLINK info block
83 * Process a user generated ADD message and add the domains from the message
84 * to the hash table. See netlabel.h for a description of the message format.
85 * Returns zero on success, negative values on failure.
88 static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
90 int ret_val = -EINVAL;
91 struct netlbl_dom_map *entry = NULL;
94 struct netlbl_audit audit_info;
96 if (!info->attrs[NLBL_MGMT_A_DOMAIN] ||
97 !info->attrs[NLBL_MGMT_A_PROTOCOL])
100 netlbl_netlink_auditinfo(skb, &audit_info);
102 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
107 tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
108 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
109 if (entry->domain == NULL) {
113 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
114 nla_strlcpy(entry->domain, info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
116 switch (entry->type) {
117 case NETLBL_NLTYPE_UNLABELED:
118 ret_val = netlbl_domhsh_add(entry, &audit_info);
120 case NETLBL_NLTYPE_CIPSOV4:
121 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
124 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
125 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
126 if (entry->type_def.cipsov4 == NULL)
128 ret_val = netlbl_domhsh_add(entry, &audit_info);
130 cipso_v4_doi_putdef(entry->type_def.cipsov4);
142 kfree(entry->domain);
148 * netlbl_mgmt_remove - Handle a REMOVE message
149 * @skb: the NETLINK buffer
150 * @info: the Generic NETLINK info block
153 * Process a user generated REMOVE message and remove the specified domain
154 * mappings. Returns zero on success, negative values on failure.
157 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
160 struct netlbl_audit audit_info;
162 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
165 netlbl_netlink_auditinfo(skb, &audit_info);
167 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
168 return netlbl_domhsh_remove(domain, &audit_info);
172 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
173 * @entry: the domain mapping hash table entry
174 * @arg: the netlbl_domhsh_walk_arg structure
177 * This function is designed to be used as a callback to the
178 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
179 * message. Returns the size of the message on success, negative values on
183 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
185 int ret_val = -ENOMEM;
186 struct netlbl_domhsh_walk_arg *cb_arg = arg;
189 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
190 cb_arg->seq, &netlbl_mgmt_gnl_family,
191 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
193 goto listall_cb_failure;
195 ret_val = nla_put_string(cb_arg->skb,
199 goto listall_cb_failure;
200 ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
202 goto listall_cb_failure;
203 switch (entry->type) {
204 case NETLBL_NLTYPE_CIPSOV4:
205 ret_val = nla_put_u32(cb_arg->skb,
207 entry->type_def.cipsov4->doi);
209 goto listall_cb_failure;
214 return genlmsg_end(cb_arg->skb, data);
217 genlmsg_cancel(cb_arg->skb, data);
222 * netlbl_mgmt_listall - Handle a LISTALL message
223 * @skb: the NETLINK buffer
224 * @cb: the NETLINK callback
227 * Process a user generated LISTALL message and dumps the domain hash table in
228 * a form suitable for use in a kernel generated LISTALL message. Returns zero
229 * on success, negative values on failure.
232 static int netlbl_mgmt_listall(struct sk_buff *skb,
233 struct netlink_callback *cb)
235 struct netlbl_domhsh_walk_arg cb_arg;
236 u32 skip_bkt = cb->args[0];
237 u32 skip_chain = cb->args[1];
241 cb_arg.seq = cb->nlh->nlmsg_seq;
243 netlbl_domhsh_walk(&skip_bkt,
245 netlbl_mgmt_listall_cb,
248 cb->args[0] = skip_bkt;
249 cb->args[1] = skip_chain;
254 * netlbl_mgmt_adddef - Handle an ADDDEF message
255 * @skb: the NETLINK buffer
256 * @info: the Generic NETLINK info block
259 * Process a user generated ADDDEF message and respond accordingly. Returns
260 * zero on success, negative values on failure.
263 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
265 int ret_val = -EINVAL;
266 struct netlbl_dom_map *entry = NULL;
268 struct netlbl_audit audit_info;
270 if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
273 netlbl_netlink_auditinfo(skb, &audit_info);
275 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
280 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
282 switch (entry->type) {
283 case NETLBL_NLTYPE_UNLABELED:
284 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
286 case NETLBL_NLTYPE_CIPSOV4:
287 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
290 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
291 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
292 if (entry->type_def.cipsov4 == NULL)
294 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
296 cipso_v4_doi_putdef(entry->type_def.cipsov4);
312 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
313 * @skb: the NETLINK buffer
314 * @info: the Generic NETLINK info block
317 * Process a user generated REMOVEDEF message and remove the default domain
318 * mapping. Returns zero on success, negative values on failure.
321 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
323 struct netlbl_audit audit_info;
325 netlbl_netlink_auditinfo(skb, &audit_info);
327 return netlbl_domhsh_remove_default(&audit_info);
331 * netlbl_mgmt_listdef - Handle a LISTDEF message
332 * @skb: the NETLINK buffer
333 * @info: the Generic NETLINK info block
336 * Process a user generated LISTDEF message and dumps the default domain
337 * mapping in a form suitable for use in a kernel generated LISTDEF message.
338 * Returns zero on success, negative values on failure.
341 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
343 int ret_val = -ENOMEM;
344 struct sk_buff *ans_skb = NULL;
346 struct netlbl_dom_map *entry;
348 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
351 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
352 0, NLBL_MGMT_C_LISTDEF);
354 goto listdef_failure;
357 entry = netlbl_domhsh_getentry(NULL);
360 goto listdef_failure_lock;
362 ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
364 goto listdef_failure_lock;
365 switch (entry->type) {
366 case NETLBL_NLTYPE_CIPSOV4:
367 ret_val = nla_put_u32(ans_skb,
369 entry->type_def.cipsov4->doi);
371 goto listdef_failure_lock;
376 genlmsg_end(ans_skb, data);
377 return genlmsg_reply(ans_skb, info);
379 listdef_failure_lock:
387 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
388 * @skb: the skb to write to
389 * @seq: the NETLINK sequence number
390 * @cb: the NETLINK callback
391 * @protocol: the NetLabel protocol to use in the message
394 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
395 * answer a application's PROTOCOLS message. Returns the size of the message
396 * on success, negative values on failure.
399 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
400 struct netlink_callback *cb,
403 int ret_val = -ENOMEM;
406 data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
407 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
408 NLBL_MGMT_C_PROTOCOLS);
410 goto protocols_cb_failure;
412 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
414 goto protocols_cb_failure;
416 return genlmsg_end(skb, data);
418 protocols_cb_failure:
419 genlmsg_cancel(skb, data);
424 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
425 * @skb: the NETLINK buffer
426 * @cb: the NETLINK callback
429 * Process a user generated PROTOCOLS message and respond accordingly.
432 static int netlbl_mgmt_protocols(struct sk_buff *skb,
433 struct netlink_callback *cb)
435 u32 protos_sent = cb->args[0];
437 if (protos_sent == 0) {
438 if (netlbl_mgmt_protocols_cb(skb,
440 NETLBL_NLTYPE_UNLABELED) < 0)
441 goto protocols_return;
444 if (protos_sent == 1) {
445 if (netlbl_mgmt_protocols_cb(skb,
447 NETLBL_NLTYPE_CIPSOV4) < 0)
448 goto protocols_return;
453 cb->args[0] = protos_sent;
458 * netlbl_mgmt_version - Handle a VERSION message
459 * @skb: the NETLINK buffer
460 * @info: the Generic NETLINK info block
463 * Process a user generated VERSION message and respond accordingly. Returns
464 * zero on success, negative values on failure.
467 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
469 int ret_val = -ENOMEM;
470 struct sk_buff *ans_skb = NULL;
473 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
476 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
477 0, NLBL_MGMT_C_VERSION);
479 goto version_failure;
481 ret_val = nla_put_u32(ans_skb,
483 NETLBL_PROTO_VERSION);
485 goto version_failure;
487 genlmsg_end(ans_skb, data);
488 return genlmsg_reply(ans_skb, info);
497 * NetLabel Generic NETLINK Command Definitions
500 static struct genl_ops netlbl_mgmt_genl_ops[] = {
502 .cmd = NLBL_MGMT_C_ADD,
503 .flags = GENL_ADMIN_PERM,
504 .policy = netlbl_mgmt_genl_policy,
505 .doit = netlbl_mgmt_add,
509 .cmd = NLBL_MGMT_C_REMOVE,
510 .flags = GENL_ADMIN_PERM,
511 .policy = netlbl_mgmt_genl_policy,
512 .doit = netlbl_mgmt_remove,
516 .cmd = NLBL_MGMT_C_LISTALL,
518 .policy = netlbl_mgmt_genl_policy,
520 .dumpit = netlbl_mgmt_listall,
523 .cmd = NLBL_MGMT_C_ADDDEF,
524 .flags = GENL_ADMIN_PERM,
525 .policy = netlbl_mgmt_genl_policy,
526 .doit = netlbl_mgmt_adddef,
530 .cmd = NLBL_MGMT_C_REMOVEDEF,
531 .flags = GENL_ADMIN_PERM,
532 .policy = netlbl_mgmt_genl_policy,
533 .doit = netlbl_mgmt_removedef,
537 .cmd = NLBL_MGMT_C_LISTDEF,
539 .policy = netlbl_mgmt_genl_policy,
540 .doit = netlbl_mgmt_listdef,
544 .cmd = NLBL_MGMT_C_PROTOCOLS,
546 .policy = netlbl_mgmt_genl_policy,
548 .dumpit = netlbl_mgmt_protocols,
551 .cmd = NLBL_MGMT_C_VERSION,
553 .policy = netlbl_mgmt_genl_policy,
554 .doit = netlbl_mgmt_version,
560 * NetLabel Generic NETLINK Protocol Functions
564 * netlbl_mgmt_genl_init - Register the NetLabel management component
567 * Register the NetLabel management component with the Generic NETLINK
568 * mechanism. Returns zero on success, negative values on failure.
571 int __init netlbl_mgmt_genl_init(void)
575 ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
579 for (i = 0; i < ARRAY_SIZE(netlbl_mgmt_genl_ops); i++) {
580 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
581 &netlbl_mgmt_genl_ops[i]);