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;
91 if (!info->attrs[NLBL_MGMT_A_DOMAIN] ||
92 !info->attrs[NLBL_MGMT_A_PROTOCOL])
95 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
100 tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
101 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
102 if (entry->domain == NULL) {
106 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
107 nla_strlcpy(entry->domain, info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
109 switch (entry->type) {
110 case NETLBL_NLTYPE_UNLABELED:
111 ret_val = netlbl_domhsh_add(entry, NETLINK_CB(skb).sid);
113 case NETLBL_NLTYPE_CIPSOV4:
114 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
117 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
118 /* We should be holding a rcu_read_lock() here while we hold
119 * the result but since the entry will always be deleted when
120 * the CIPSO DOI is deleted we aren't going to keep the
123 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
124 if (entry->type_def.cipsov4 == NULL) {
128 ret_val = netlbl_domhsh_add(entry, NETLINK_CB(skb).sid);
141 kfree(entry->domain);
147 * netlbl_mgmt_remove - Handle a REMOVE message
148 * @skb: the NETLINK buffer
149 * @info: the Generic NETLINK info block
152 * Process a user generated REMOVE message and remove the specified domain
153 * mappings. Returns zero on success, negative values on failure.
156 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
160 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
163 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
164 return netlbl_domhsh_remove(domain, NETLINK_CB(skb).sid);
168 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
169 * @entry: the domain mapping hash table entry
170 * @arg: the netlbl_domhsh_walk_arg structure
173 * This function is designed to be used as a callback to the
174 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
175 * message. Returns the size of the message on success, negative values on
179 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
181 int ret_val = -ENOMEM;
182 struct netlbl_domhsh_walk_arg *cb_arg = arg;
185 data = netlbl_netlink_hdr_put(cb_arg->skb,
186 NETLINK_CB(cb_arg->nl_cb->skb).pid,
188 netlbl_mgmt_gnl_family.id,
190 NLBL_MGMT_C_LISTALL);
192 goto listall_cb_failure;
194 ret_val = nla_put_string(cb_arg->skb,
198 goto listall_cb_failure;
199 ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
201 goto listall_cb_failure;
202 switch (entry->type) {
203 case NETLBL_NLTYPE_CIPSOV4:
204 ret_val = nla_put_u32(cb_arg->skb,
206 entry->type_def.cipsov4->doi);
208 goto listall_cb_failure;
213 return genlmsg_end(cb_arg->skb, data);
216 genlmsg_cancel(cb_arg->skb, data);
221 * netlbl_mgmt_listall - Handle a LISTALL message
222 * @skb: the NETLINK buffer
223 * @cb: the NETLINK callback
226 * Process a user generated LISTALL message and dumps the domain hash table in
227 * a form suitable for use in a kernel generated LISTALL message. Returns zero
228 * on success, negative values on failure.
231 static int netlbl_mgmt_listall(struct sk_buff *skb,
232 struct netlink_callback *cb)
234 struct netlbl_domhsh_walk_arg cb_arg;
235 u32 skip_bkt = cb->args[0];
236 u32 skip_chain = cb->args[1];
240 cb_arg.seq = cb->nlh->nlmsg_seq;
242 netlbl_domhsh_walk(&skip_bkt,
244 netlbl_mgmt_listall_cb,
247 cb->args[0] = skip_bkt;
248 cb->args[1] = skip_chain;
253 * netlbl_mgmt_adddef - Handle an ADDDEF message
254 * @skb: the NETLINK buffer
255 * @info: the Generic NETLINK info block
258 * Process a user generated ADDDEF message and respond accordingly. Returns
259 * zero on success, negative values on failure.
262 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
264 int ret_val = -EINVAL;
265 struct netlbl_dom_map *entry = NULL;
268 if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
271 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
276 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
278 switch (entry->type) {
279 case NETLBL_NLTYPE_UNLABELED:
280 ret_val = netlbl_domhsh_add_default(entry,
281 NETLINK_CB(skb).sid);
283 case NETLBL_NLTYPE_CIPSOV4:
284 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
287 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
288 /* We should be holding a rcu_read_lock() here while we hold
289 * the result but since the entry will always be deleted when
290 * the CIPSO DOI is deleted we aren't going to keep the
293 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
294 if (entry->type_def.cipsov4 == NULL) {
298 ret_val = netlbl_domhsh_add_default(entry,
299 NETLINK_CB(skb).sid);
316 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
317 * @skb: the NETLINK buffer
318 * @info: the Generic NETLINK info block
321 * Process a user generated REMOVEDEF message and remove the default domain
322 * mapping. Returns zero on success, negative values on failure.
325 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
327 return netlbl_domhsh_remove_default(NETLINK_CB(skb).sid);
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_GOODSIZE, GFP_KERNEL);
351 data = netlbl_netlink_hdr_put(ans_skb,
354 netlbl_mgmt_gnl_family.id,
356 NLBL_MGMT_C_LISTDEF);
358 goto listdef_failure;
361 entry = netlbl_domhsh_getentry(NULL);
364 goto listdef_failure_lock;
366 ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
368 goto listdef_failure_lock;
369 switch (entry->type) {
370 case NETLBL_NLTYPE_CIPSOV4:
371 ret_val = nla_put_u32(ans_skb,
373 entry->type_def.cipsov4->doi);
375 goto listdef_failure_lock;
380 genlmsg_end(ans_skb, data);
382 ret_val = genlmsg_unicast(ans_skb, info->snd_pid);
384 goto listdef_failure;
387 listdef_failure_lock:
395 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
396 * @skb: the skb to write to
397 * @seq: the NETLINK sequence number
398 * @cb: the NETLINK callback
399 * @protocol: the NetLabel protocol to use in the message
402 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
403 * answer a application's PROTOCOLS message. Returns the size of the message
404 * on success, negative values on failure.
407 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
408 struct netlink_callback *cb,
411 int ret_val = -ENOMEM;
414 data = netlbl_netlink_hdr_put(skb,
415 NETLINK_CB(cb->skb).pid,
417 netlbl_mgmt_gnl_family.id,
419 NLBL_MGMT_C_PROTOCOLS);
421 goto protocols_cb_failure;
423 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
425 goto protocols_cb_failure;
427 return genlmsg_end(skb, data);
429 protocols_cb_failure:
430 genlmsg_cancel(skb, data);
435 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
436 * @skb: the NETLINK buffer
437 * @cb: the NETLINK callback
440 * Process a user generated PROTOCOLS message and respond accordingly.
443 static int netlbl_mgmt_protocols(struct sk_buff *skb,
444 struct netlink_callback *cb)
446 u32 protos_sent = cb->args[0];
448 if (protos_sent == 0) {
449 if (netlbl_mgmt_protocols_cb(skb,
451 NETLBL_NLTYPE_UNLABELED) < 0)
452 goto protocols_return;
455 if (protos_sent == 1) {
456 if (netlbl_mgmt_protocols_cb(skb,
458 NETLBL_NLTYPE_CIPSOV4) < 0)
459 goto protocols_return;
464 cb->args[0] = protos_sent;
469 * netlbl_mgmt_version - Handle a VERSION message
470 * @skb: the NETLINK buffer
471 * @info: the Generic NETLINK info block
474 * Process a user generated VERSION message and respond accordingly. Returns
475 * zero on success, negative values on failure.
478 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
480 int ret_val = -ENOMEM;
481 struct sk_buff *ans_skb = NULL;
484 ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
487 data = netlbl_netlink_hdr_put(ans_skb,
490 netlbl_mgmt_gnl_family.id,
492 NLBL_MGMT_C_VERSION);
494 goto version_failure;
496 ret_val = nla_put_u32(ans_skb,
498 NETLBL_PROTO_VERSION);
500 goto version_failure;
502 genlmsg_end(ans_skb, data);
504 ret_val = genlmsg_unicast(ans_skb, info->snd_pid);
506 goto version_failure;
516 * NetLabel Generic NETLINK Command Definitions
519 static struct genl_ops netlbl_mgmt_genl_c_add = {
520 .cmd = NLBL_MGMT_C_ADD,
521 .flags = GENL_ADMIN_PERM,
522 .policy = netlbl_mgmt_genl_policy,
523 .doit = netlbl_mgmt_add,
527 static struct genl_ops netlbl_mgmt_genl_c_remove = {
528 .cmd = NLBL_MGMT_C_REMOVE,
529 .flags = GENL_ADMIN_PERM,
530 .policy = netlbl_mgmt_genl_policy,
531 .doit = netlbl_mgmt_remove,
535 static struct genl_ops netlbl_mgmt_genl_c_listall = {
536 .cmd = NLBL_MGMT_C_LISTALL,
538 .policy = netlbl_mgmt_genl_policy,
540 .dumpit = netlbl_mgmt_listall,
543 static struct genl_ops netlbl_mgmt_genl_c_adddef = {
544 .cmd = NLBL_MGMT_C_ADDDEF,
545 .flags = GENL_ADMIN_PERM,
546 .policy = netlbl_mgmt_genl_policy,
547 .doit = netlbl_mgmt_adddef,
551 static struct genl_ops netlbl_mgmt_genl_c_removedef = {
552 .cmd = NLBL_MGMT_C_REMOVEDEF,
553 .flags = GENL_ADMIN_PERM,
554 .policy = netlbl_mgmt_genl_policy,
555 .doit = netlbl_mgmt_removedef,
559 static struct genl_ops netlbl_mgmt_genl_c_listdef = {
560 .cmd = NLBL_MGMT_C_LISTDEF,
562 .policy = netlbl_mgmt_genl_policy,
563 .doit = netlbl_mgmt_listdef,
567 static struct genl_ops netlbl_mgmt_genl_c_protocols = {
568 .cmd = NLBL_MGMT_C_PROTOCOLS,
570 .policy = netlbl_mgmt_genl_policy,
572 .dumpit = netlbl_mgmt_protocols,
575 static struct genl_ops netlbl_mgmt_genl_c_version = {
576 .cmd = NLBL_MGMT_C_VERSION,
578 .policy = netlbl_mgmt_genl_policy,
579 .doit = netlbl_mgmt_version,
584 * NetLabel Generic NETLINK Protocol Functions
588 * netlbl_mgmt_genl_init - Register the NetLabel management component
591 * Register the NetLabel management component with the Generic NETLINK
592 * mechanism. Returns zero on success, negative values on failure.
595 int netlbl_mgmt_genl_init(void)
599 ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
603 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
604 &netlbl_mgmt_genl_c_add);
607 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
608 &netlbl_mgmt_genl_c_remove);
611 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
612 &netlbl_mgmt_genl_c_listall);
615 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
616 &netlbl_mgmt_genl_c_adddef);
619 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
620 &netlbl_mgmt_genl_c_removedef);
623 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
624 &netlbl_mgmt_genl_c_listdef);
627 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
628 &netlbl_mgmt_genl_c_protocols);
631 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
632 &netlbl_mgmt_genl_c_version);