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 const 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 = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
192 cb_arg->seq, &netlbl_mgmt_gnl_family,
193 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
195 goto listall_cb_failure;
197 ret_val = nla_put_string(cb_arg->skb,
201 goto listall_cb_failure;
202 ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
204 goto listall_cb_failure;
205 switch (entry->type) {
206 case NETLBL_NLTYPE_CIPSOV4:
207 ret_val = nla_put_u32(cb_arg->skb,
209 entry->type_def.cipsov4->doi);
211 goto listall_cb_failure;
216 return genlmsg_end(cb_arg->skb, data);
219 genlmsg_cancel(cb_arg->skb, data);
224 * netlbl_mgmt_listall - Handle a LISTALL message
225 * @skb: the NETLINK buffer
226 * @cb: the NETLINK callback
229 * Process a user generated LISTALL message and dumps the domain hash table in
230 * a form suitable for use in a kernel generated LISTALL message. Returns zero
231 * on success, negative values on failure.
234 static int netlbl_mgmt_listall(struct sk_buff *skb,
235 struct netlink_callback *cb)
237 struct netlbl_domhsh_walk_arg cb_arg;
238 u32 skip_bkt = cb->args[0];
239 u32 skip_chain = cb->args[1];
243 cb_arg.seq = cb->nlh->nlmsg_seq;
245 netlbl_domhsh_walk(&skip_bkt,
247 netlbl_mgmt_listall_cb,
250 cb->args[0] = skip_bkt;
251 cb->args[1] = skip_chain;
256 * netlbl_mgmt_adddef - Handle an ADDDEF message
257 * @skb: the NETLINK buffer
258 * @info: the Generic NETLINK info block
261 * Process a user generated ADDDEF message and respond accordingly. Returns
262 * zero on success, negative values on failure.
265 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
267 int ret_val = -EINVAL;
268 struct netlbl_dom_map *entry = NULL;
270 struct netlbl_audit audit_info;
272 if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
275 netlbl_netlink_auditinfo(skb, &audit_info);
277 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
282 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
284 switch (entry->type) {
285 case NETLBL_NLTYPE_UNLABELED:
286 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
288 case NETLBL_NLTYPE_CIPSOV4:
289 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
292 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
293 /* We should be holding a rcu_read_lock() here while we hold
294 * the result but since the entry will always be deleted when
295 * the CIPSO DOI is deleted we aren't going to keep the
298 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
299 if (entry->type_def.cipsov4 == NULL) {
303 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
320 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
321 * @skb: the NETLINK buffer
322 * @info: the Generic NETLINK info block
325 * Process a user generated REMOVEDEF message and remove the default domain
326 * mapping. Returns zero on success, negative values on failure.
329 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
331 struct netlbl_audit audit_info;
333 netlbl_netlink_auditinfo(skb, &audit_info);
335 return netlbl_domhsh_remove_default(&audit_info);
339 * netlbl_mgmt_listdef - Handle a LISTDEF message
340 * @skb: the NETLINK buffer
341 * @info: the Generic NETLINK info block
344 * Process a user generated LISTDEF message and dumps the default domain
345 * mapping in a form suitable for use in a kernel generated LISTDEF message.
346 * Returns zero on success, negative values on failure.
349 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
351 int ret_val = -ENOMEM;
352 struct sk_buff *ans_skb = NULL;
354 struct netlbl_dom_map *entry;
356 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
359 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
360 0, NLBL_MGMT_C_LISTDEF);
362 goto listdef_failure;
365 entry = netlbl_domhsh_getentry(NULL);
368 goto listdef_failure_lock;
370 ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
372 goto listdef_failure_lock;
373 switch (entry->type) {
374 case NETLBL_NLTYPE_CIPSOV4:
375 ret_val = nla_put_u32(ans_skb,
377 entry->type_def.cipsov4->doi);
379 goto listdef_failure_lock;
384 genlmsg_end(ans_skb, data);
386 ret_val = genlmsg_reply(ans_skb, info);
388 goto listdef_failure;
391 listdef_failure_lock:
399 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
400 * @skb: the skb to write to
401 * @seq: the NETLINK sequence number
402 * @cb: the NETLINK callback
403 * @protocol: the NetLabel protocol to use in the message
406 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
407 * answer a application's PROTOCOLS message. Returns the size of the message
408 * on success, negative values on failure.
411 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
412 struct netlink_callback *cb,
415 int ret_val = -ENOMEM;
418 data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
419 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
420 NLBL_MGMT_C_PROTOCOLS);
422 goto protocols_cb_failure;
424 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
426 goto protocols_cb_failure;
428 return genlmsg_end(skb, data);
430 protocols_cb_failure:
431 genlmsg_cancel(skb, data);
436 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
437 * @skb: the NETLINK buffer
438 * @cb: the NETLINK callback
441 * Process a user generated PROTOCOLS message and respond accordingly.
444 static int netlbl_mgmt_protocols(struct sk_buff *skb,
445 struct netlink_callback *cb)
447 u32 protos_sent = cb->args[0];
449 if (protos_sent == 0) {
450 if (netlbl_mgmt_protocols_cb(skb,
452 NETLBL_NLTYPE_UNLABELED) < 0)
453 goto protocols_return;
456 if (protos_sent == 1) {
457 if (netlbl_mgmt_protocols_cb(skb,
459 NETLBL_NLTYPE_CIPSOV4) < 0)
460 goto protocols_return;
465 cb->args[0] = protos_sent;
470 * netlbl_mgmt_version - Handle a VERSION message
471 * @skb: the NETLINK buffer
472 * @info: the Generic NETLINK info block
475 * Process a user generated VERSION message and respond accordingly. Returns
476 * zero on success, negative values on failure.
479 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
481 int ret_val = -ENOMEM;
482 struct sk_buff *ans_skb = NULL;
485 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
488 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
489 0, NLBL_MGMT_C_VERSION);
491 goto version_failure;
493 ret_val = nla_put_u32(ans_skb,
495 NETLBL_PROTO_VERSION);
497 goto version_failure;
499 genlmsg_end(ans_skb, data);
501 ret_val = genlmsg_reply(ans_skb, info);
503 goto version_failure;
513 * NetLabel Generic NETLINK Command Definitions
516 static struct genl_ops netlbl_mgmt_genl_c_add = {
517 .cmd = NLBL_MGMT_C_ADD,
518 .flags = GENL_ADMIN_PERM,
519 .policy = netlbl_mgmt_genl_policy,
520 .doit = netlbl_mgmt_add,
524 static struct genl_ops netlbl_mgmt_genl_c_remove = {
525 .cmd = NLBL_MGMT_C_REMOVE,
526 .flags = GENL_ADMIN_PERM,
527 .policy = netlbl_mgmt_genl_policy,
528 .doit = netlbl_mgmt_remove,
532 static struct genl_ops netlbl_mgmt_genl_c_listall = {
533 .cmd = NLBL_MGMT_C_LISTALL,
535 .policy = netlbl_mgmt_genl_policy,
537 .dumpit = netlbl_mgmt_listall,
540 static struct genl_ops netlbl_mgmt_genl_c_adddef = {
541 .cmd = NLBL_MGMT_C_ADDDEF,
542 .flags = GENL_ADMIN_PERM,
543 .policy = netlbl_mgmt_genl_policy,
544 .doit = netlbl_mgmt_adddef,
548 static struct genl_ops netlbl_mgmt_genl_c_removedef = {
549 .cmd = NLBL_MGMT_C_REMOVEDEF,
550 .flags = GENL_ADMIN_PERM,
551 .policy = netlbl_mgmt_genl_policy,
552 .doit = netlbl_mgmt_removedef,
556 static struct genl_ops netlbl_mgmt_genl_c_listdef = {
557 .cmd = NLBL_MGMT_C_LISTDEF,
559 .policy = netlbl_mgmt_genl_policy,
560 .doit = netlbl_mgmt_listdef,
564 static struct genl_ops netlbl_mgmt_genl_c_protocols = {
565 .cmd = NLBL_MGMT_C_PROTOCOLS,
567 .policy = netlbl_mgmt_genl_policy,
569 .dumpit = netlbl_mgmt_protocols,
572 static struct genl_ops netlbl_mgmt_genl_c_version = {
573 .cmd = NLBL_MGMT_C_VERSION,
575 .policy = netlbl_mgmt_genl_policy,
576 .doit = netlbl_mgmt_version,
581 * NetLabel Generic NETLINK Protocol Functions
585 * netlbl_mgmt_genl_init - Register the NetLabel management component
588 * Register the NetLabel management component with the Generic NETLINK
589 * mechanism. Returns zero on success, negative values on failure.
592 int netlbl_mgmt_genl_init(void)
596 ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
600 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
601 &netlbl_mgmt_genl_c_add);
604 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
605 &netlbl_mgmt_genl_c_remove);
608 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
609 &netlbl_mgmt_genl_c_listall);
612 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
613 &netlbl_mgmt_genl_c_adddef);
616 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
617 &netlbl_mgmt_genl_c_removedef);
620 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
621 &netlbl_mgmt_genl_c_listdef);
624 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
625 &netlbl_mgmt_genl_c_protocols);
628 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
629 &netlbl_mgmt_genl_c_version);