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);
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);
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);
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);
282 case NETLBL_NLTYPE_CIPSOV4:
283 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
286 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
287 /* We should be holding a rcu_read_lock() here while we hold
288 * the result but since the entry will always be deleted when
289 * the CIPSO DOI is deleted we aren't going to keep the
292 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
293 if (entry->type_def.cipsov4 == NULL) {
297 ret_val = netlbl_domhsh_add_default(entry);
314 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
315 * @skb: the NETLINK buffer
316 * @info: the Generic NETLINK info block
319 * Process a user generated REMOVEDEF message and remove the default domain
320 * mapping. Returns zero on success, negative values on failure.
323 static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
325 return netlbl_domhsh_remove_default();
329 * netlbl_mgmt_listdef - Handle a LISTDEF message
330 * @skb: the NETLINK buffer
331 * @info: the Generic NETLINK info block
334 * Process a user generated LISTDEF message and dumps the default domain
335 * mapping in a form suitable for use in a kernel generated LISTDEF message.
336 * Returns zero on success, negative values on failure.
339 static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
341 int ret_val = -ENOMEM;
342 struct sk_buff *ans_skb = NULL;
344 struct netlbl_dom_map *entry;
346 ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
349 data = netlbl_netlink_hdr_put(ans_skb,
352 netlbl_mgmt_gnl_family.id,
354 NLBL_MGMT_C_LISTDEF);
356 goto listdef_failure;
359 entry = netlbl_domhsh_getentry(NULL);
362 goto listdef_failure_lock;
364 ret_val = nla_put_u32(ans_skb, NLBL_MGMT_A_PROTOCOL, entry->type);
366 goto listdef_failure_lock;
367 switch (entry->type) {
368 case NETLBL_NLTYPE_CIPSOV4:
369 ret_val = nla_put_u32(ans_skb,
371 entry->type_def.cipsov4->doi);
373 goto listdef_failure_lock;
378 genlmsg_end(ans_skb, data);
380 ret_val = genlmsg_unicast(ans_skb, info->snd_pid);
382 goto listdef_failure;
385 listdef_failure_lock:
393 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
394 * @skb: the skb to write to
395 * @seq: the NETLINK sequence number
396 * @cb: the NETLINK callback
397 * @protocol: the NetLabel protocol to use in the message
400 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
401 * answer a application's PROTOCOLS message. Returns the size of the message
402 * on success, negative values on failure.
405 static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
406 struct netlink_callback *cb,
409 int ret_val = -ENOMEM;
412 data = netlbl_netlink_hdr_put(skb,
413 NETLINK_CB(cb->skb).pid,
415 netlbl_mgmt_gnl_family.id,
417 NLBL_MGMT_C_PROTOCOLS);
419 goto protocols_cb_failure;
421 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
423 goto protocols_cb_failure;
425 return genlmsg_end(skb, data);
427 protocols_cb_failure:
428 genlmsg_cancel(skb, data);
433 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
434 * @skb: the NETLINK buffer
435 * @cb: the NETLINK callback
438 * Process a user generated PROTOCOLS message and respond accordingly.
441 static int netlbl_mgmt_protocols(struct sk_buff *skb,
442 struct netlink_callback *cb)
444 u32 protos_sent = cb->args[0];
446 if (protos_sent == 0) {
447 if (netlbl_mgmt_protocols_cb(skb,
449 NETLBL_NLTYPE_UNLABELED) < 0)
450 goto protocols_return;
453 if (protos_sent == 1) {
454 if (netlbl_mgmt_protocols_cb(skb,
456 NETLBL_NLTYPE_CIPSOV4) < 0)
457 goto protocols_return;
462 cb->args[0] = protos_sent;
467 * netlbl_mgmt_version - Handle a VERSION message
468 * @skb: the NETLINK buffer
469 * @info: the Generic NETLINK info block
472 * Process a user generated VERSION message and respond accordingly. Returns
473 * zero on success, negative values on failure.
476 static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
478 int ret_val = -ENOMEM;
479 struct sk_buff *ans_skb = NULL;
482 ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
485 data = netlbl_netlink_hdr_put(ans_skb,
488 netlbl_mgmt_gnl_family.id,
490 NLBL_MGMT_C_VERSION);
492 goto version_failure;
494 ret_val = nla_put_u32(ans_skb,
496 NETLBL_PROTO_VERSION);
498 goto version_failure;
500 genlmsg_end(ans_skb, data);
502 ret_val = genlmsg_unicast(ans_skb, info->snd_pid);
504 goto version_failure;
514 * NetLabel Generic NETLINK Command Definitions
517 static struct genl_ops netlbl_mgmt_genl_c_add = {
518 .cmd = NLBL_MGMT_C_ADD,
519 .flags = GENL_ADMIN_PERM,
520 .policy = netlbl_mgmt_genl_policy,
521 .doit = netlbl_mgmt_add,
525 static struct genl_ops netlbl_mgmt_genl_c_remove = {
526 .cmd = NLBL_MGMT_C_REMOVE,
527 .flags = GENL_ADMIN_PERM,
528 .policy = netlbl_mgmt_genl_policy,
529 .doit = netlbl_mgmt_remove,
533 static struct genl_ops netlbl_mgmt_genl_c_listall = {
534 .cmd = NLBL_MGMT_C_LISTALL,
536 .policy = netlbl_mgmt_genl_policy,
538 .dumpit = netlbl_mgmt_listall,
541 static struct genl_ops netlbl_mgmt_genl_c_adddef = {
542 .cmd = NLBL_MGMT_C_ADDDEF,
543 .flags = GENL_ADMIN_PERM,
544 .policy = netlbl_mgmt_genl_policy,
545 .doit = netlbl_mgmt_adddef,
549 static struct genl_ops netlbl_mgmt_genl_c_removedef = {
550 .cmd = NLBL_MGMT_C_REMOVEDEF,
551 .flags = GENL_ADMIN_PERM,
552 .policy = netlbl_mgmt_genl_policy,
553 .doit = netlbl_mgmt_removedef,
557 static struct genl_ops netlbl_mgmt_genl_c_listdef = {
558 .cmd = NLBL_MGMT_C_LISTDEF,
560 .policy = netlbl_mgmt_genl_policy,
561 .doit = netlbl_mgmt_listdef,
565 static struct genl_ops netlbl_mgmt_genl_c_protocols = {
566 .cmd = NLBL_MGMT_C_PROTOCOLS,
568 .policy = netlbl_mgmt_genl_policy,
570 .dumpit = netlbl_mgmt_protocols,
573 static struct genl_ops netlbl_mgmt_genl_c_version = {
574 .cmd = NLBL_MGMT_C_VERSION,
576 .policy = netlbl_mgmt_genl_policy,
577 .doit = netlbl_mgmt_version,
582 * NetLabel Generic NETLINK Protocol Functions
586 * netlbl_mgmt_genl_init - Register the NetLabel management component
589 * Register the NetLabel management component with the Generic NETLINK
590 * mechanism. Returns zero on success, negative values on failure.
593 int netlbl_mgmt_genl_init(void)
597 ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
601 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
602 &netlbl_mgmt_genl_c_add);
605 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
606 &netlbl_mgmt_genl_c_remove);
609 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
610 &netlbl_mgmt_genl_c_listall);
613 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
614 &netlbl_mgmt_genl_c_adddef);
617 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
618 &netlbl_mgmt_genl_c_removedef);
621 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
622 &netlbl_mgmt_genl_c_listdef);
625 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
626 &netlbl_mgmt_genl_c_protocols);
629 ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
630 &netlbl_mgmt_genl_c_version);