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 /* We should be holding a rcu_read_lock() here while we hold
126 * the result but since the entry will always be deleted when
127 * the CIPSO DOI is deleted we aren't going to keep the
130 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
131 if (entry->type_def.cipsov4 == NULL) {
135 ret_val = netlbl_domhsh_add(entry, &audit_info);
148 kfree(entry->domain);
154 * netlbl_mgmt_remove - Handle a REMOVE message
155 * @skb: the NETLINK buffer
156 * @info: the Generic NETLINK info block
159 * Process a user generated REMOVE message and remove the specified domain
160 * mappings. Returns zero on success, negative values on failure.
163 static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
166 struct netlbl_audit audit_info;
168 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
171 netlbl_netlink_auditinfo(skb, &audit_info);
173 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
174 return netlbl_domhsh_remove(domain, &audit_info);
178 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
179 * @entry: the domain mapping hash table entry
180 * @arg: the netlbl_domhsh_walk_arg structure
183 * This function is designed to be used as a callback to the
184 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
185 * message. Returns the size of the message on success, negative values on
189 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
191 int ret_val = -ENOMEM;
192 struct netlbl_domhsh_walk_arg *cb_arg = arg;
195 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
196 cb_arg->seq, &netlbl_mgmt_gnl_family,
197 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
199 goto listall_cb_failure;
201 ret_val = nla_put_string(cb_arg->skb,
205 goto listall_cb_failure;
206 ret_val = nla_put_u32(cb_arg->skb, NLBL_MGMT_A_PROTOCOL, entry->type);
208 goto listall_cb_failure;
209 switch (entry->type) {
210 case NETLBL_NLTYPE_CIPSOV4:
211 ret_val = nla_put_u32(cb_arg->skb,
213 entry->type_def.cipsov4->doi);
215 goto listall_cb_failure;
220 return genlmsg_end(cb_arg->skb, data);
223 genlmsg_cancel(cb_arg->skb, data);
228 * netlbl_mgmt_listall - Handle a LISTALL message
229 * @skb: the NETLINK buffer
230 * @cb: the NETLINK callback
233 * Process a user generated LISTALL message and dumps the domain hash table in
234 * a form suitable for use in a kernel generated LISTALL message. Returns zero
235 * on success, negative values on failure.
238 static int netlbl_mgmt_listall(struct sk_buff *skb,
239 struct netlink_callback *cb)
241 struct netlbl_domhsh_walk_arg cb_arg;
242 u32 skip_bkt = cb->args[0];
243 u32 skip_chain = cb->args[1];
247 cb_arg.seq = cb->nlh->nlmsg_seq;
249 netlbl_domhsh_walk(&skip_bkt,
251 netlbl_mgmt_listall_cb,
254 cb->args[0] = skip_bkt;
255 cb->args[1] = skip_chain;
260 * netlbl_mgmt_adddef - Handle an ADDDEF message
261 * @skb: the NETLINK buffer
262 * @info: the Generic NETLINK info block
265 * Process a user generated ADDDEF message and respond accordingly. Returns
266 * zero on success, negative values on failure.
269 static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
271 int ret_val = -EINVAL;
272 struct netlbl_dom_map *entry = NULL;
274 struct netlbl_audit audit_info;
276 if (!info->attrs[NLBL_MGMT_A_PROTOCOL])
279 netlbl_netlink_auditinfo(skb, &audit_info);
281 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
286 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
288 switch (entry->type) {
289 case NETLBL_NLTYPE_UNLABELED:
290 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
292 case NETLBL_NLTYPE_CIPSOV4:
293 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
296 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
297 /* We should be holding a rcu_read_lock() here while we hold
298 * the result but since the entry will always be deleted when
299 * the CIPSO DOI is deleted we aren't going to keep the
302 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
303 if (entry->type_def.cipsov4 == NULL) {
307 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
324 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
325 * @skb: the NETLINK buffer
326 * @info: the Generic NETLINK info block
329 * Process a user generated REMOVEDEF message and remove the default domain
330 * mapping. Returns zero on success, negative values on failure.
333 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
335 struct netlbl_audit audit_info;
337 netlbl_netlink_auditinfo(skb, &audit_info);
339 return netlbl_domhsh_remove_default(&audit_info);
343 * netlbl_mgmt_listdef - Handle a LISTDEF message
344 * @skb: the NETLINK buffer
345 * @info: the Generic NETLINK info block
348 * Process a user generated LISTDEF message and dumps the default domain
349 * mapping in a form suitable for use in a kernel generated LISTDEF message.
350 * Returns zero on success, negative values on failure.
353 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
355 int ret_val = -ENOMEM;
356 struct sk_buff *ans_skb = NULL;
358 struct netlbl_dom_map *entry;
360 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
363 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
364 0, NLBL_MGMT_C_LISTDEF);
366 goto listdef_failure;
369 entry = netlbl_domhsh_getentry(NULL);
372 goto listdef_failure_lock;
374 ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
376 goto listdef_failure_lock;
377 switch (entry->type) {
378 case NETLBL_NLTYPE_CIPSOV4:
379 ret_val = nla_put_u32(ans_skb,
381 entry->type_def.cipsov4->doi);
383 goto listdef_failure_lock;
388 genlmsg_end(ans_skb, data);
390 ret_val = genlmsg_reply(ans_skb, info);
392 goto listdef_failure;
395 listdef_failure_lock:
403 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
404 * @skb: the skb to write to
405 * @seq: the NETLINK sequence number
406 * @cb: the NETLINK callback
407 * @protocol: the NetLabel protocol to use in the message
410 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
411 * answer a application's PROTOCOLS message. Returns the size of the message
412 * on success, negative values on failure.
415 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
416 struct netlink_callback *cb,
419 int ret_val = -ENOMEM;
422 data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
423 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
424 NLBL_MGMT_C_PROTOCOLS);
426 goto protocols_cb_failure;
428 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
430 goto protocols_cb_failure;
432 return genlmsg_end(skb, data);
434 protocols_cb_failure:
435 genlmsg_cancel(skb, data);
440 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
441 * @skb: the NETLINK buffer
442 * @cb: the NETLINK callback
445 * Process a user generated PROTOCOLS message and respond accordingly.
448 static int netlbl_mgmt_protocols(struct sk_buff *skb,
449 struct netlink_callback *cb)
451 u32 protos_sent = cb->args[0];
453 if (protos_sent == 0) {
454 if (netlbl_mgmt_protocols_cb(skb,
456 NETLBL_NLTYPE_UNLABELED) < 0)
457 goto protocols_return;
460 if (protos_sent == 1) {
461 if (netlbl_mgmt_protocols_cb(skb,
463 NETLBL_NLTYPE_CIPSOV4) < 0)
464 goto protocols_return;
469 cb->args[0] = protos_sent;
474 * netlbl_mgmt_version - Handle a VERSION message
475 * @skb: the NETLINK buffer
476 * @info: the Generic NETLINK info block
479 * Process a user generated VERSION message and respond accordingly. Returns
480 * zero on success, negative values on failure.
483 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
485 int ret_val = -ENOMEM;
486 struct sk_buff *ans_skb = NULL;
489 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
492 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
493 0, NLBL_MGMT_C_VERSION);
495 goto version_failure;
497 ret_val = nla_put_u32(ans_skb,
499 NETLBL_PROTO_VERSION);
501 goto version_failure;
503 genlmsg_end(ans_skb, data);
505 ret_val = genlmsg_reply(ans_skb, info);
507 goto version_failure;
517 * NetLabel Generic NETLINK Command Definitions
520 static struct genl_ops netlbl_mgmt_genl_c_add = {
521 .cmd = NLBL_MGMT_C_ADD,
522 .flags = GENL_ADMIN_PERM,
523 .policy = netlbl_mgmt_genl_policy,
524 .doit = netlbl_mgmt_add,
528 static struct genl_ops netlbl_mgmt_genl_c_remove = {
529 .cmd = NLBL_MGMT_C_REMOVE,
530 .flags = GENL_ADMIN_PERM,
531 .policy = netlbl_mgmt_genl_policy,
532 .doit = netlbl_mgmt_remove,
536 static struct genl_ops netlbl_mgmt_genl_c_listall = {
537 .cmd = NLBL_MGMT_C_LISTALL,
539 .policy = netlbl_mgmt_genl_policy,
541 .dumpit = netlbl_mgmt_listall,
544 static struct genl_ops netlbl_mgmt_genl_c_adddef = {
545 .cmd = NLBL_MGMT_C_ADDDEF,
546 .flags = GENL_ADMIN_PERM,
547 .policy = netlbl_mgmt_genl_policy,
548 .doit = netlbl_mgmt_adddef,
552 static struct genl_ops netlbl_mgmt_genl_c_removedef = {
553 .cmd = NLBL_MGMT_C_REMOVEDEF,
554 .flags = GENL_ADMIN_PERM,
555 .policy = netlbl_mgmt_genl_policy,
556 .doit = netlbl_mgmt_removedef,
560 static struct genl_ops netlbl_mgmt_genl_c_listdef = {
561 .cmd = NLBL_MGMT_C_LISTDEF,
563 .policy = netlbl_mgmt_genl_policy,
564 .doit = netlbl_mgmt_listdef,
568 static struct genl_ops netlbl_mgmt_genl_c_protocols = {
569 .cmd = NLBL_MGMT_C_PROTOCOLS,
571 .policy = netlbl_mgmt_genl_policy,
573 .dumpit = netlbl_mgmt_protocols,
576 static struct genl_ops netlbl_mgmt_genl_c_version = {
577 .cmd = NLBL_MGMT_C_VERSION,
579 .policy = netlbl_mgmt_genl_policy,
580 .doit = netlbl_mgmt_version,
585 * NetLabel Generic NETLINK Protocol Functions
589 * netlbl_mgmt_genl_init - Register the NetLabel management component
592 * Register the NetLabel management component with the Generic NETLINK
593 * mechanism. Returns zero on success, negative values on failure.
596 int netlbl_mgmt_genl_init(void)
600 ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
604 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
605 &netlbl_mgmt_genl_c_add);
608 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
609 &netlbl_mgmt_genl_c_remove);
612 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
613 &netlbl_mgmt_genl_c_listall);
616 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
617 &netlbl_mgmt_genl_c_adddef);
620 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
621 &netlbl_mgmt_genl_c_removedef);
624 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
625 &netlbl_mgmt_genl_c_listdef);
628 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
629 &netlbl_mgmt_genl_c_protocols);
632 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
633 &netlbl_mgmt_genl_c_version);