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1/*
2 * NetLabel Management Support
3 *
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.
7 *
8 * Author: Paul Moore <paul@paul-moore.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 *
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.
19 *
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.
24 *
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
28 *
29 */
30
31#include <linux/types.h>
32#include <linux/socket.h>
33#include <linux/string.h>
34#include <linux/skbuff.h>
35#include <linux/in.h>
36#include <linux/in6.h>
37#include <linux/slab.h>
38#include <net/sock.h>
39#include <net/netlink.h>
40#include <net/genetlink.h>
41#include <net/ip.h>
42#include <net/ipv6.h>
43#include <net/netlabel.h>
44#include <net/cipso_ipv4.h>
45#include <linux/atomic.h>
46
47#include "netlabel_domainhash.h"
48#include "netlabel_user.h"
49#include "netlabel_mgmt.h"
50
51/* NetLabel configured protocol counter */
52atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
53
54/* Argument struct for netlbl_domhsh_walk() */
55struct netlbl_domhsh_walk_arg {
56 struct netlink_callback *nl_cb;
57 struct sk_buff *skb;
58 u32 seq;
59};
60
61/* NetLabel Generic NETLINK CIPSOv4 family */
62static struct genl_family netlbl_mgmt_gnl_family = {
63 .id = GENL_ID_GENERATE,
64 .hdrsize = 0,
65 .name = NETLBL_NLTYPE_MGMT_NAME,
66 .version = NETLBL_PROTO_VERSION,
67 .maxattr = NLBL_MGMT_A_MAX,
68};
69
70/* NetLabel Netlink attribute policy */
71static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
72 [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
73 [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
74 [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
75 [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
76};
77
78/*
79 * Helper Functions
80 */
81
82/**
83 * netlbl_mgmt_add - Handle an ADD message
84 * @info: the Generic NETLINK info block
85 * @audit_info: NetLabel audit information
86 *
87 * Description:
88 * Helper function for the ADD and ADDDEF messages to add the domain mappings
89 * from the message to the hash table. See netlabel.h for a description of the
90 * message format. Returns zero on success, negative values on failure.
91 *
92 */
93static int netlbl_mgmt_add_common(struct genl_info *info,
94 struct netlbl_audit *audit_info)
95{
96 int ret_val = -EINVAL;
97 struct netlbl_dom_map *entry = NULL;
98 struct netlbl_domaddr_map *addrmap = NULL;
99 struct cipso_v4_doi *cipsov4 = NULL;
100 u32 tmp_val;
101
102 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
103 if (entry == NULL) {
104 ret_val = -ENOMEM;
105 goto add_failure;
106 }
107 entry->type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
108 if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
109 size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
110 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
111 if (entry->domain == NULL) {
112 ret_val = -ENOMEM;
113 goto add_failure;
114 }
115 nla_strlcpy(entry->domain,
116 info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
117 }
118
119 /* NOTE: internally we allow/use a entry->type value of
120 * NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
121 * to pass that as a protocol value because we need to know the
122 * "real" protocol */
123
124 switch (entry->type) {
125 case NETLBL_NLTYPE_UNLABELED:
126 break;
127 case NETLBL_NLTYPE_CIPSOV4:
128 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
129 goto add_failure;
130
131 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
132 cipsov4 = cipso_v4_doi_getdef(tmp_val);
133 if (cipsov4 == NULL)
134 goto add_failure;
135 entry->type_def.cipsov4 = cipsov4;
136 break;
137 default:
138 goto add_failure;
139 }
140
141 if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
142 struct in_addr *addr;
143 struct in_addr *mask;
144 struct netlbl_domaddr4_map *map;
145
146 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
147 if (addrmap == NULL) {
148 ret_val = -ENOMEM;
149 goto add_failure;
150 }
151 INIT_LIST_HEAD(&addrmap->list4);
152 INIT_LIST_HEAD(&addrmap->list6);
153
154 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
155 sizeof(struct in_addr)) {
156 ret_val = -EINVAL;
157 goto add_failure;
158 }
159 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
160 sizeof(struct in_addr)) {
161 ret_val = -EINVAL;
162 goto add_failure;
163 }
164 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
165 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
166
167 map = kzalloc(sizeof(*map), GFP_KERNEL);
168 if (map == NULL) {
169 ret_val = -ENOMEM;
170 goto add_failure;
171 }
172 map->list.addr = addr->s_addr & mask->s_addr;
173 map->list.mask = mask->s_addr;
174 map->list.valid = 1;
175 map->type = entry->type;
176 if (cipsov4)
177 map->type_def.cipsov4 = cipsov4;
178
179 ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
180 if (ret_val != 0) {
181 kfree(map);
182 goto add_failure;
183 }
184
185 entry->type = NETLBL_NLTYPE_ADDRSELECT;
186 entry->type_def.addrsel = addrmap;
187#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
188 } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
189 struct in6_addr *addr;
190 struct in6_addr *mask;
191 struct netlbl_domaddr6_map *map;
192
193 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
194 if (addrmap == NULL) {
195 ret_val = -ENOMEM;
196 goto add_failure;
197 }
198 INIT_LIST_HEAD(&addrmap->list4);
199 INIT_LIST_HEAD(&addrmap->list6);
200
201 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
202 sizeof(struct in6_addr)) {
203 ret_val = -EINVAL;
204 goto add_failure;
205 }
206 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
207 sizeof(struct in6_addr)) {
208 ret_val = -EINVAL;
209 goto add_failure;
210 }
211 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
212 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
213
214 map = kzalloc(sizeof(*map), GFP_KERNEL);
215 if (map == NULL) {
216 ret_val = -ENOMEM;
217 goto add_failure;
218 }
219 ipv6_addr_copy(&map->list.addr, addr);
220 map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
221 map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
222 map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
223 map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
224 ipv6_addr_copy(&map->list.mask, mask);
225 map->list.valid = 1;
226 map->type = entry->type;
227
228 ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
229 if (ret_val != 0) {
230 kfree(map);
231 goto add_failure;
232 }
233
234 entry->type = NETLBL_NLTYPE_ADDRSELECT;
235 entry->type_def.addrsel = addrmap;
236#endif /* IPv6 */
237 }
238
239 ret_val = netlbl_domhsh_add(entry, audit_info);
240 if (ret_val != 0)
241 goto add_failure;
242
243 return 0;
244
245add_failure:
246 if (cipsov4)
247 cipso_v4_doi_putdef(cipsov4);
248 if (entry)
249 kfree(entry->domain);
250 kfree(addrmap);
251 kfree(entry);
252 return ret_val;
253}
254
255/**
256 * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
257 * @skb: the NETLINK buffer
258 * @entry: the map entry
259 *
260 * Description:
261 * This function is a helper function used by the LISTALL and LISTDEF command
262 * handlers. The caller is responsible for ensuring that the RCU read lock
263 * is held. Returns zero on success, negative values on failure.
264 *
265 */
266static int netlbl_mgmt_listentry(struct sk_buff *skb,
267 struct netlbl_dom_map *entry)
268{
269 int ret_val = 0;
270 struct nlattr *nla_a;
271 struct nlattr *nla_b;
272 struct netlbl_af4list *iter4;
273#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
274 struct netlbl_af6list *iter6;
275#endif
276
277 if (entry->domain != NULL) {
278 ret_val = nla_put_string(skb,
279 NLBL_MGMT_A_DOMAIN, entry->domain);
280 if (ret_val != 0)
281 return ret_val;
282 }
283
284 switch (entry->type) {
285 case NETLBL_NLTYPE_ADDRSELECT:
286 nla_a = nla_nest_start(skb, NLBL_MGMT_A_SELECTORLIST);
287 if (nla_a == NULL)
288 return -ENOMEM;
289
290 netlbl_af4list_foreach_rcu(iter4,
291 &entry->type_def.addrsel->list4) {
292 struct netlbl_domaddr4_map *map4;
293 struct in_addr addr_struct;
294
295 nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
296 if (nla_b == NULL)
297 return -ENOMEM;
298
299 addr_struct.s_addr = iter4->addr;
300 ret_val = nla_put(skb, NLBL_MGMT_A_IPV4ADDR,
301 sizeof(struct in_addr),
302 &addr_struct);
303 if (ret_val != 0)
304 return ret_val;
305 addr_struct.s_addr = iter4->mask;
306 ret_val = nla_put(skb, NLBL_MGMT_A_IPV4MASK,
307 sizeof(struct in_addr),
308 &addr_struct);
309 if (ret_val != 0)
310 return ret_val;
311 map4 = netlbl_domhsh_addr4_entry(iter4);
312 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
313 map4->type);
314 if (ret_val != 0)
315 return ret_val;
316 switch (map4->type) {
317 case NETLBL_NLTYPE_CIPSOV4:
318 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
319 map4->type_def.cipsov4->doi);
320 if (ret_val != 0)
321 return ret_val;
322 break;
323 }
324
325 nla_nest_end(skb, nla_b);
326 }
327#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
328 netlbl_af6list_foreach_rcu(iter6,
329 &entry->type_def.addrsel->list6) {
330 struct netlbl_domaddr6_map *map6;
331
332 nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
333 if (nla_b == NULL)
334 return -ENOMEM;
335
336 ret_val = nla_put(skb, NLBL_MGMT_A_IPV6ADDR,
337 sizeof(struct in6_addr),
338 &iter6->addr);
339 if (ret_val != 0)
340 return ret_val;
341 ret_val = nla_put(skb, NLBL_MGMT_A_IPV6MASK,
342 sizeof(struct in6_addr),
343 &iter6->mask);
344 if (ret_val != 0)
345 return ret_val;
346 map6 = netlbl_domhsh_addr6_entry(iter6);
347 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
348 map6->type);
349 if (ret_val != 0)
350 return ret_val;
351
352 nla_nest_end(skb, nla_b);
353 }
354#endif /* IPv6 */
355
356 nla_nest_end(skb, nla_a);
357 break;
358 case NETLBL_NLTYPE_UNLABELED:
359 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, entry->type);
360 break;
361 case NETLBL_NLTYPE_CIPSOV4:
362 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, entry->type);
363 if (ret_val != 0)
364 return ret_val;
365 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
366 entry->type_def.cipsov4->doi);
367 break;
368 }
369
370 return ret_val;
371}
372
373/*
374 * NetLabel Command Handlers
375 */
376
377/**
378 * netlbl_mgmt_add - Handle an ADD message
379 * @skb: the NETLINK buffer
380 * @info: the Generic NETLINK info block
381 *
382 * Description:
383 * Process a user generated ADD message and add the domains from the message
384 * to the hash table. See netlabel.h for a description of the message format.
385 * Returns zero on success, negative values on failure.
386 *
387 */
388static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
389{
390 struct netlbl_audit audit_info;
391
392 if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
393 (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
394 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
395 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
396 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
397 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
398 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
399 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
400 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
401 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
402 return -EINVAL;
403
404 netlbl_netlink_auditinfo(skb, &audit_info);
405
406 return netlbl_mgmt_add_common(info, &audit_info);
407}
408
409/**
410 * netlbl_mgmt_remove - Handle a REMOVE message
411 * @skb: the NETLINK buffer
412 * @info: the Generic NETLINK info block
413 *
414 * Description:
415 * Process a user generated REMOVE message and remove the specified domain
416 * mappings. Returns zero on success, negative values on failure.
417 *
418 */
419static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
420{
421 char *domain;
422 struct netlbl_audit audit_info;
423
424 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
425 return -EINVAL;
426
427 netlbl_netlink_auditinfo(skb, &audit_info);
428
429 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
430 return netlbl_domhsh_remove(domain, &audit_info);
431}
432
433/**
434 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
435 * @entry: the domain mapping hash table entry
436 * @arg: the netlbl_domhsh_walk_arg structure
437 *
438 * Description:
439 * This function is designed to be used as a callback to the
440 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
441 * message. Returns the size of the message on success, negative values on
442 * failure.
443 *
444 */
445static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
446{
447 int ret_val = -ENOMEM;
448 struct netlbl_domhsh_walk_arg *cb_arg = arg;
449 void *data;
450
451 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
452 cb_arg->seq, &netlbl_mgmt_gnl_family,
453 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
454 if (data == NULL)
455 goto listall_cb_failure;
456
457 ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
458 if (ret_val != 0)
459 goto listall_cb_failure;
460
461 cb_arg->seq++;
462 return genlmsg_end(cb_arg->skb, data);
463
464listall_cb_failure:
465 genlmsg_cancel(cb_arg->skb, data);
466 return ret_val;
467}
468
469/**
470 * netlbl_mgmt_listall - Handle a LISTALL message
471 * @skb: the NETLINK buffer
472 * @cb: the NETLINK callback
473 *
474 * Description:
475 * Process a user generated LISTALL message and dumps the domain hash table in
476 * a form suitable for use in a kernel generated LISTALL message. Returns zero
477 * on success, negative values on failure.
478 *
479 */
480static int netlbl_mgmt_listall(struct sk_buff *skb,
481 struct netlink_callback *cb)
482{
483 struct netlbl_domhsh_walk_arg cb_arg;
484 u32 skip_bkt = cb->args[0];
485 u32 skip_chain = cb->args[1];
486
487 cb_arg.nl_cb = cb;
488 cb_arg.skb = skb;
489 cb_arg.seq = cb->nlh->nlmsg_seq;
490
491 netlbl_domhsh_walk(&skip_bkt,
492 &skip_chain,
493 netlbl_mgmt_listall_cb,
494 &cb_arg);
495
496 cb->args[0] = skip_bkt;
497 cb->args[1] = skip_chain;
498 return skb->len;
499}
500
501/**
502 * netlbl_mgmt_adddef - Handle an ADDDEF message
503 * @skb: the NETLINK buffer
504 * @info: the Generic NETLINK info block
505 *
506 * Description:
507 * Process a user generated ADDDEF message and respond accordingly. Returns
508 * zero on success, negative values on failure.
509 *
510 */
511static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
512{
513 struct netlbl_audit audit_info;
514
515 if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
516 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
517 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
518 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
519 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
520 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
521 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
522 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
523 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
524 return -EINVAL;
525
526 netlbl_netlink_auditinfo(skb, &audit_info);
527
528 return netlbl_mgmt_add_common(info, &audit_info);
529}
530
531/**
532 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
533 * @skb: the NETLINK buffer
534 * @info: the Generic NETLINK info block
535 *
536 * Description:
537 * Process a user generated REMOVEDEF message and remove the default domain
538 * mapping. Returns zero on success, negative values on failure.
539 *
540 */
541static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
542{
543 struct netlbl_audit audit_info;
544
545 netlbl_netlink_auditinfo(skb, &audit_info);
546
547 return netlbl_domhsh_remove_default(&audit_info);
548}
549
550/**
551 * netlbl_mgmt_listdef - Handle a LISTDEF message
552 * @skb: the NETLINK buffer
553 * @info: the Generic NETLINK info block
554 *
555 * Description:
556 * Process a user generated LISTDEF message and dumps the default domain
557 * mapping in a form suitable for use in a kernel generated LISTDEF message.
558 * Returns zero on success, negative values on failure.
559 *
560 */
561static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
562{
563 int ret_val = -ENOMEM;
564 struct sk_buff *ans_skb = NULL;
565 void *data;
566 struct netlbl_dom_map *entry;
567
568 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
569 if (ans_skb == NULL)
570 return -ENOMEM;
571 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
572 0, NLBL_MGMT_C_LISTDEF);
573 if (data == NULL)
574 goto listdef_failure;
575
576 rcu_read_lock();
577 entry = netlbl_domhsh_getentry(NULL);
578 if (entry == NULL) {
579 ret_val = -ENOENT;
580 goto listdef_failure_lock;
581 }
582 ret_val = netlbl_mgmt_listentry(ans_skb, entry);
583 rcu_read_unlock();
584 if (ret_val != 0)
585 goto listdef_failure;
586
587 genlmsg_end(ans_skb, data);
588 return genlmsg_reply(ans_skb, info);
589
590listdef_failure_lock:
591 rcu_read_unlock();
592listdef_failure:
593 kfree_skb(ans_skb);
594 return ret_val;
595}
596
597/**
598 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
599 * @skb: the skb to write to
600 * @cb: the NETLINK callback
601 * @protocol: the NetLabel protocol to use in the message
602 *
603 * Description:
604 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
605 * answer a application's PROTOCOLS message. Returns the size of the message
606 * on success, negative values on failure.
607 *
608 */
609static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
610 struct netlink_callback *cb,
611 u32 protocol)
612{
613 int ret_val = -ENOMEM;
614 void *data;
615
616 data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
617 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
618 NLBL_MGMT_C_PROTOCOLS);
619 if (data == NULL)
620 goto protocols_cb_failure;
621
622 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
623 if (ret_val != 0)
624 goto protocols_cb_failure;
625
626 return genlmsg_end(skb, data);
627
628protocols_cb_failure:
629 genlmsg_cancel(skb, data);
630 return ret_val;
631}
632
633/**
634 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
635 * @skb: the NETLINK buffer
636 * @cb: the NETLINK callback
637 *
638 * Description:
639 * Process a user generated PROTOCOLS message and respond accordingly.
640 *
641 */
642static int netlbl_mgmt_protocols(struct sk_buff *skb,
643 struct netlink_callback *cb)
644{
645 u32 protos_sent = cb->args[0];
646
647 if (protos_sent == 0) {
648 if (netlbl_mgmt_protocols_cb(skb,
649 cb,
650 NETLBL_NLTYPE_UNLABELED) < 0)
651 goto protocols_return;
652 protos_sent++;
653 }
654 if (protos_sent == 1) {
655 if (netlbl_mgmt_protocols_cb(skb,
656 cb,
657 NETLBL_NLTYPE_CIPSOV4) < 0)
658 goto protocols_return;
659 protos_sent++;
660 }
661
662protocols_return:
663 cb->args[0] = protos_sent;
664 return skb->len;
665}
666
667/**
668 * netlbl_mgmt_version - Handle a VERSION message
669 * @skb: the NETLINK buffer
670 * @info: the Generic NETLINK info block
671 *
672 * Description:
673 * Process a user generated VERSION message and respond accordingly. Returns
674 * zero on success, negative values on failure.
675 *
676 */
677static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
678{
679 int ret_val = -ENOMEM;
680 struct sk_buff *ans_skb = NULL;
681 void *data;
682
683 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
684 if (ans_skb == NULL)
685 return -ENOMEM;
686 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
687 0, NLBL_MGMT_C_VERSION);
688 if (data == NULL)
689 goto version_failure;
690
691 ret_val = nla_put_u32(ans_skb,
692 NLBL_MGMT_A_VERSION,
693 NETLBL_PROTO_VERSION);
694 if (ret_val != 0)
695 goto version_failure;
696
697 genlmsg_end(ans_skb, data);
698 return genlmsg_reply(ans_skb, info);
699
700version_failure:
701 kfree_skb(ans_skb);
702 return ret_val;
703}
704
705
706/*
707 * NetLabel Generic NETLINK Command Definitions
708 */
709
710static struct genl_ops netlbl_mgmt_genl_ops[] = {
711 {
712 .cmd = NLBL_MGMT_C_ADD,
713 .flags = GENL_ADMIN_PERM,
714 .policy = netlbl_mgmt_genl_policy,
715 .doit = netlbl_mgmt_add,
716 .dumpit = NULL,
717 },
718 {
719 .cmd = NLBL_MGMT_C_REMOVE,
720 .flags = GENL_ADMIN_PERM,
721 .policy = netlbl_mgmt_genl_policy,
722 .doit = netlbl_mgmt_remove,
723 .dumpit = NULL,
724 },
725 {
726 .cmd = NLBL_MGMT_C_LISTALL,
727 .flags = 0,
728 .policy = netlbl_mgmt_genl_policy,
729 .doit = NULL,
730 .dumpit = netlbl_mgmt_listall,
731 },
732 {
733 .cmd = NLBL_MGMT_C_ADDDEF,
734 .flags = GENL_ADMIN_PERM,
735 .policy = netlbl_mgmt_genl_policy,
736 .doit = netlbl_mgmt_adddef,
737 .dumpit = NULL,
738 },
739 {
740 .cmd = NLBL_MGMT_C_REMOVEDEF,
741 .flags = GENL_ADMIN_PERM,
742 .policy = netlbl_mgmt_genl_policy,
743 .doit = netlbl_mgmt_removedef,
744 .dumpit = NULL,
745 },
746 {
747 .cmd = NLBL_MGMT_C_LISTDEF,
748 .flags = 0,
749 .policy = netlbl_mgmt_genl_policy,
750 .doit = netlbl_mgmt_listdef,
751 .dumpit = NULL,
752 },
753 {
754 .cmd = NLBL_MGMT_C_PROTOCOLS,
755 .flags = 0,
756 .policy = netlbl_mgmt_genl_policy,
757 .doit = NULL,
758 .dumpit = netlbl_mgmt_protocols,
759 },
760 {
761 .cmd = NLBL_MGMT_C_VERSION,
762 .flags = 0,
763 .policy = netlbl_mgmt_genl_policy,
764 .doit = netlbl_mgmt_version,
765 .dumpit = NULL,
766 },
767};
768
769/*
770 * NetLabel Generic NETLINK Protocol Functions
771 */
772
773/**
774 * netlbl_mgmt_genl_init - Register the NetLabel management component
775 *
776 * Description:
777 * Register the NetLabel management component with the Generic NETLINK
778 * mechanism. Returns zero on success, negative values on failure.
779 *
780 */
781int __init netlbl_mgmt_genl_init(void)
782{
783 return genl_register_family_with_ops(&netlbl_mgmt_gnl_family,
784 netlbl_mgmt_genl_ops, ARRAY_SIZE(netlbl_mgmt_genl_ops));
785}
1/*
2 * NetLabel Management Support
3 *
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.
7 *
8 * Author: Paul Moore <paul@paul-moore.com>
9 *
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 *
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.
19 *
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.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, see <http://www.gnu.org/licenses/>.
27 *
28 */
29
30#include <linux/types.h>
31#include <linux/socket.h>
32#include <linux/string.h>
33#include <linux/skbuff.h>
34#include <linux/in.h>
35#include <linux/in6.h>
36#include <linux/slab.h>
37#include <net/sock.h>
38#include <net/netlink.h>
39#include <net/genetlink.h>
40#include <net/ip.h>
41#include <net/ipv6.h>
42#include <net/netlabel.h>
43#include <net/cipso_ipv4.h>
44#include <linux/atomic.h>
45
46#include "netlabel_domainhash.h"
47#include "netlabel_user.h"
48#include "netlabel_mgmt.h"
49
50/* NetLabel configured protocol counter */
51atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
52
53/* Argument struct for netlbl_domhsh_walk() */
54struct netlbl_domhsh_walk_arg {
55 struct netlink_callback *nl_cb;
56 struct sk_buff *skb;
57 u32 seq;
58};
59
60/* NetLabel Generic NETLINK CIPSOv4 family */
61static struct genl_family netlbl_mgmt_gnl_family = {
62 .id = GENL_ID_GENERATE,
63 .hdrsize = 0,
64 .name = NETLBL_NLTYPE_MGMT_NAME,
65 .version = NETLBL_PROTO_VERSION,
66 .maxattr = NLBL_MGMT_A_MAX,
67};
68
69/* NetLabel Netlink attribute policy */
70static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
71 [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
72 [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
73 [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
74 [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
75};
76
77/*
78 * Helper Functions
79 */
80
81/**
82 * netlbl_mgmt_add - Handle an ADD message
83 * @info: the Generic NETLINK info block
84 * @audit_info: NetLabel audit information
85 *
86 * Description:
87 * Helper function for the ADD and ADDDEF messages to add the domain mappings
88 * from the message to the hash table. See netlabel.h for a description of the
89 * message format. Returns zero on success, negative values on failure.
90 *
91 */
92static int netlbl_mgmt_add_common(struct genl_info *info,
93 struct netlbl_audit *audit_info)
94{
95 int ret_val = -EINVAL;
96 struct netlbl_domaddr_map *addrmap = NULL;
97 struct cipso_v4_doi *cipsov4 = NULL;
98 u32 tmp_val;
99 struct netlbl_dom_map *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
100
101 if (!entry)
102 return -ENOMEM;
103 entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
104 if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
105 size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
106 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
107 if (entry->domain == NULL) {
108 ret_val = -ENOMEM;
109 goto add_free_entry;
110 }
111 nla_strlcpy(entry->domain,
112 info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
113 }
114
115 /* NOTE: internally we allow/use a entry->def.type value of
116 * NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
117 * to pass that as a protocol value because we need to know the
118 * "real" protocol */
119
120 switch (entry->def.type) {
121 case NETLBL_NLTYPE_UNLABELED:
122 break;
123 case NETLBL_NLTYPE_CIPSOV4:
124 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
125 goto add_free_domain;
126
127 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
128 cipsov4 = cipso_v4_doi_getdef(tmp_val);
129 if (cipsov4 == NULL)
130 goto add_free_domain;
131 entry->def.cipso = cipsov4;
132 break;
133 default:
134 goto add_free_domain;
135 }
136
137 if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
138 struct in_addr *addr;
139 struct in_addr *mask;
140 struct netlbl_domaddr4_map *map;
141
142 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
143 if (addrmap == NULL) {
144 ret_val = -ENOMEM;
145 goto add_doi_put_def;
146 }
147 INIT_LIST_HEAD(&addrmap->list4);
148 INIT_LIST_HEAD(&addrmap->list6);
149
150 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
151 sizeof(struct in_addr)) {
152 ret_val = -EINVAL;
153 goto add_free_addrmap;
154 }
155 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
156 sizeof(struct in_addr)) {
157 ret_val = -EINVAL;
158 goto add_free_addrmap;
159 }
160 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
161 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
162
163 map = kzalloc(sizeof(*map), GFP_KERNEL);
164 if (map == NULL) {
165 ret_val = -ENOMEM;
166 goto add_free_addrmap;
167 }
168 map->list.addr = addr->s_addr & mask->s_addr;
169 map->list.mask = mask->s_addr;
170 map->list.valid = 1;
171 map->def.type = entry->def.type;
172 if (cipsov4)
173 map->def.cipso = cipsov4;
174
175 ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
176 if (ret_val != 0) {
177 kfree(map);
178 goto add_free_addrmap;
179 }
180
181 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
182 entry->def.addrsel = addrmap;
183#if IS_ENABLED(CONFIG_IPV6)
184 } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
185 struct in6_addr *addr;
186 struct in6_addr *mask;
187 struct netlbl_domaddr6_map *map;
188
189 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
190 if (addrmap == NULL) {
191 ret_val = -ENOMEM;
192 goto add_doi_put_def;
193 }
194 INIT_LIST_HEAD(&addrmap->list4);
195 INIT_LIST_HEAD(&addrmap->list6);
196
197 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
198 sizeof(struct in6_addr)) {
199 ret_val = -EINVAL;
200 goto add_free_addrmap;
201 }
202 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
203 sizeof(struct in6_addr)) {
204 ret_val = -EINVAL;
205 goto add_free_addrmap;
206 }
207 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
208 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
209
210 map = kzalloc(sizeof(*map), GFP_KERNEL);
211 if (map == NULL) {
212 ret_val = -ENOMEM;
213 goto add_free_addrmap;
214 }
215 map->list.addr = *addr;
216 map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
217 map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
218 map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
219 map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
220 map->list.mask = *mask;
221 map->list.valid = 1;
222 map->def.type = entry->def.type;
223
224 ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
225 if (ret_val != 0) {
226 kfree(map);
227 goto add_free_addrmap;
228 }
229
230 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
231 entry->def.addrsel = addrmap;
232#endif /* IPv6 */
233 }
234
235 ret_val = netlbl_domhsh_add(entry, audit_info);
236 if (ret_val != 0)
237 goto add_free_addrmap;
238
239 return 0;
240
241add_free_addrmap:
242 kfree(addrmap);
243add_doi_put_def:
244 cipso_v4_doi_putdef(cipsov4);
245add_free_domain:
246 kfree(entry->domain);
247add_free_entry:
248 kfree(entry);
249 return ret_val;
250}
251
252/**
253 * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
254 * @skb: the NETLINK buffer
255 * @entry: the map entry
256 *
257 * Description:
258 * This function is a helper function used by the LISTALL and LISTDEF command
259 * handlers. The caller is responsible for ensuring that the RCU read lock
260 * is held. Returns zero on success, negative values on failure.
261 *
262 */
263static int netlbl_mgmt_listentry(struct sk_buff *skb,
264 struct netlbl_dom_map *entry)
265{
266 int ret_val = 0;
267 struct nlattr *nla_a;
268 struct nlattr *nla_b;
269 struct netlbl_af4list *iter4;
270#if IS_ENABLED(CONFIG_IPV6)
271 struct netlbl_af6list *iter6;
272#endif
273
274 if (entry->domain != NULL) {
275 ret_val = nla_put_string(skb,
276 NLBL_MGMT_A_DOMAIN, entry->domain);
277 if (ret_val != 0)
278 return ret_val;
279 }
280
281 switch (entry->def.type) {
282 case NETLBL_NLTYPE_ADDRSELECT:
283 nla_a = nla_nest_start(skb, NLBL_MGMT_A_SELECTORLIST);
284 if (nla_a == NULL)
285 return -ENOMEM;
286
287 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
288 struct netlbl_domaddr4_map *map4;
289 struct in_addr addr_struct;
290
291 nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
292 if (nla_b == NULL)
293 return -ENOMEM;
294
295 addr_struct.s_addr = iter4->addr;
296 ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4ADDR,
297 addr_struct.s_addr);
298 if (ret_val != 0)
299 return ret_val;
300 addr_struct.s_addr = iter4->mask;
301 ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4MASK,
302 addr_struct.s_addr);
303 if (ret_val != 0)
304 return ret_val;
305 map4 = netlbl_domhsh_addr4_entry(iter4);
306 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
307 map4->def.type);
308 if (ret_val != 0)
309 return ret_val;
310 switch (map4->def.type) {
311 case NETLBL_NLTYPE_CIPSOV4:
312 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
313 map4->def.cipso->doi);
314 if (ret_val != 0)
315 return ret_val;
316 break;
317 }
318
319 nla_nest_end(skb, nla_b);
320 }
321#if IS_ENABLED(CONFIG_IPV6)
322 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
323 struct netlbl_domaddr6_map *map6;
324
325 nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
326 if (nla_b == NULL)
327 return -ENOMEM;
328
329 ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6ADDR,
330 &iter6->addr);
331 if (ret_val != 0)
332 return ret_val;
333 ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6MASK,
334 &iter6->mask);
335 if (ret_val != 0)
336 return ret_val;
337 map6 = netlbl_domhsh_addr6_entry(iter6);
338 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
339 map6->def.type);
340 if (ret_val != 0)
341 return ret_val;
342
343 nla_nest_end(skb, nla_b);
344 }
345#endif /* IPv6 */
346
347 nla_nest_end(skb, nla_a);
348 break;
349 case NETLBL_NLTYPE_UNLABELED:
350 ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
351 break;
352 case NETLBL_NLTYPE_CIPSOV4:
353 ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
354 if (ret_val != 0)
355 return ret_val;
356 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
357 entry->def.cipso->doi);
358 break;
359 }
360
361 return ret_val;
362}
363
364/*
365 * NetLabel Command Handlers
366 */
367
368/**
369 * netlbl_mgmt_add - Handle an ADD message
370 * @skb: the NETLINK buffer
371 * @info: the Generic NETLINK info block
372 *
373 * Description:
374 * Process a user generated ADD message and add the domains from the message
375 * to the hash table. See netlabel.h for a description of the message format.
376 * Returns zero on success, negative values on failure.
377 *
378 */
379static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
380{
381 struct netlbl_audit audit_info;
382
383 if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
384 (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
385 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
386 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
387 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
388 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
389 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
390 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
391 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
392 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
393 return -EINVAL;
394
395 netlbl_netlink_auditinfo(skb, &audit_info);
396
397 return netlbl_mgmt_add_common(info, &audit_info);
398}
399
400/**
401 * netlbl_mgmt_remove - Handle a REMOVE message
402 * @skb: the NETLINK buffer
403 * @info: the Generic NETLINK info block
404 *
405 * Description:
406 * Process a user generated REMOVE message and remove the specified domain
407 * mappings. Returns zero on success, negative values on failure.
408 *
409 */
410static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
411{
412 char *domain;
413 struct netlbl_audit audit_info;
414
415 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
416 return -EINVAL;
417
418 netlbl_netlink_auditinfo(skb, &audit_info);
419
420 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
421 return netlbl_domhsh_remove(domain, &audit_info);
422}
423
424/**
425 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
426 * @entry: the domain mapping hash table entry
427 * @arg: the netlbl_domhsh_walk_arg structure
428 *
429 * Description:
430 * This function is designed to be used as a callback to the
431 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
432 * message. Returns the size of the message on success, negative values on
433 * failure.
434 *
435 */
436static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
437{
438 int ret_val = -ENOMEM;
439 struct netlbl_domhsh_walk_arg *cb_arg = arg;
440 void *data;
441
442 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
443 cb_arg->seq, &netlbl_mgmt_gnl_family,
444 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
445 if (data == NULL)
446 goto listall_cb_failure;
447
448 ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
449 if (ret_val != 0)
450 goto listall_cb_failure;
451
452 cb_arg->seq++;
453 genlmsg_end(cb_arg->skb, data);
454 return 0;
455
456listall_cb_failure:
457 genlmsg_cancel(cb_arg->skb, data);
458 return ret_val;
459}
460
461/**
462 * netlbl_mgmt_listall - Handle a LISTALL message
463 * @skb: the NETLINK buffer
464 * @cb: the NETLINK callback
465 *
466 * Description:
467 * Process a user generated LISTALL message and dumps the domain hash table in
468 * a form suitable for use in a kernel generated LISTALL message. Returns zero
469 * on success, negative values on failure.
470 *
471 */
472static int netlbl_mgmt_listall(struct sk_buff *skb,
473 struct netlink_callback *cb)
474{
475 struct netlbl_domhsh_walk_arg cb_arg;
476 u32 skip_bkt = cb->args[0];
477 u32 skip_chain = cb->args[1];
478
479 cb_arg.nl_cb = cb;
480 cb_arg.skb = skb;
481 cb_arg.seq = cb->nlh->nlmsg_seq;
482
483 netlbl_domhsh_walk(&skip_bkt,
484 &skip_chain,
485 netlbl_mgmt_listall_cb,
486 &cb_arg);
487
488 cb->args[0] = skip_bkt;
489 cb->args[1] = skip_chain;
490 return skb->len;
491}
492
493/**
494 * netlbl_mgmt_adddef - Handle an ADDDEF message
495 * @skb: the NETLINK buffer
496 * @info: the Generic NETLINK info block
497 *
498 * Description:
499 * Process a user generated ADDDEF message and respond accordingly. Returns
500 * zero on success, negative values on failure.
501 *
502 */
503static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
504{
505 struct netlbl_audit audit_info;
506
507 if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
508 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
509 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
510 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
511 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
512 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
513 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
514 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
515 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
516 return -EINVAL;
517
518 netlbl_netlink_auditinfo(skb, &audit_info);
519
520 return netlbl_mgmt_add_common(info, &audit_info);
521}
522
523/**
524 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
525 * @skb: the NETLINK buffer
526 * @info: the Generic NETLINK info block
527 *
528 * Description:
529 * Process a user generated REMOVEDEF message and remove the default domain
530 * mapping. Returns zero on success, negative values on failure.
531 *
532 */
533static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
534{
535 struct netlbl_audit audit_info;
536
537 netlbl_netlink_auditinfo(skb, &audit_info);
538
539 return netlbl_domhsh_remove_default(&audit_info);
540}
541
542/**
543 * netlbl_mgmt_listdef - Handle a LISTDEF message
544 * @skb: the NETLINK buffer
545 * @info: the Generic NETLINK info block
546 *
547 * Description:
548 * Process a user generated LISTDEF message and dumps the default domain
549 * mapping in a form suitable for use in a kernel generated LISTDEF message.
550 * Returns zero on success, negative values on failure.
551 *
552 */
553static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
554{
555 int ret_val = -ENOMEM;
556 struct sk_buff *ans_skb = NULL;
557 void *data;
558 struct netlbl_dom_map *entry;
559
560 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
561 if (ans_skb == NULL)
562 return -ENOMEM;
563 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
564 0, NLBL_MGMT_C_LISTDEF);
565 if (data == NULL)
566 goto listdef_failure;
567
568 rcu_read_lock();
569 entry = netlbl_domhsh_getentry(NULL);
570 if (entry == NULL) {
571 ret_val = -ENOENT;
572 goto listdef_failure_lock;
573 }
574 ret_val = netlbl_mgmt_listentry(ans_skb, entry);
575 rcu_read_unlock();
576 if (ret_val != 0)
577 goto listdef_failure;
578
579 genlmsg_end(ans_skb, data);
580 return genlmsg_reply(ans_skb, info);
581
582listdef_failure_lock:
583 rcu_read_unlock();
584listdef_failure:
585 kfree_skb(ans_skb);
586 return ret_val;
587}
588
589/**
590 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
591 * @skb: the skb to write to
592 * @cb: the NETLINK callback
593 * @protocol: the NetLabel protocol to use in the message
594 *
595 * Description:
596 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
597 * answer a application's PROTOCOLS message. Returns the size of the message
598 * on success, negative values on failure.
599 *
600 */
601static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
602 struct netlink_callback *cb,
603 u32 protocol)
604{
605 int ret_val = -ENOMEM;
606 void *data;
607
608 data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
609 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
610 NLBL_MGMT_C_PROTOCOLS);
611 if (data == NULL)
612 goto protocols_cb_failure;
613
614 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
615 if (ret_val != 0)
616 goto protocols_cb_failure;
617
618 genlmsg_end(skb, data);
619 return 0;
620
621protocols_cb_failure:
622 genlmsg_cancel(skb, data);
623 return ret_val;
624}
625
626/**
627 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
628 * @skb: the NETLINK buffer
629 * @cb: the NETLINK callback
630 *
631 * Description:
632 * Process a user generated PROTOCOLS message and respond accordingly.
633 *
634 */
635static int netlbl_mgmt_protocols(struct sk_buff *skb,
636 struct netlink_callback *cb)
637{
638 u32 protos_sent = cb->args[0];
639
640 if (protos_sent == 0) {
641 if (netlbl_mgmt_protocols_cb(skb,
642 cb,
643 NETLBL_NLTYPE_UNLABELED) < 0)
644 goto protocols_return;
645 protos_sent++;
646 }
647 if (protos_sent == 1) {
648 if (netlbl_mgmt_protocols_cb(skb,
649 cb,
650 NETLBL_NLTYPE_CIPSOV4) < 0)
651 goto protocols_return;
652 protos_sent++;
653 }
654
655protocols_return:
656 cb->args[0] = protos_sent;
657 return skb->len;
658}
659
660/**
661 * netlbl_mgmt_version - Handle a VERSION message
662 * @skb: the NETLINK buffer
663 * @info: the Generic NETLINK info block
664 *
665 * Description:
666 * Process a user generated VERSION message and respond accordingly. Returns
667 * zero on success, negative values on failure.
668 *
669 */
670static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
671{
672 int ret_val = -ENOMEM;
673 struct sk_buff *ans_skb = NULL;
674 void *data;
675
676 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
677 if (ans_skb == NULL)
678 return -ENOMEM;
679 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
680 0, NLBL_MGMT_C_VERSION);
681 if (data == NULL)
682 goto version_failure;
683
684 ret_val = nla_put_u32(ans_skb,
685 NLBL_MGMT_A_VERSION,
686 NETLBL_PROTO_VERSION);
687 if (ret_val != 0)
688 goto version_failure;
689
690 genlmsg_end(ans_skb, data);
691 return genlmsg_reply(ans_skb, info);
692
693version_failure:
694 kfree_skb(ans_skb);
695 return ret_val;
696}
697
698
699/*
700 * NetLabel Generic NETLINK Command Definitions
701 */
702
703static const struct genl_ops netlbl_mgmt_genl_ops[] = {
704 {
705 .cmd = NLBL_MGMT_C_ADD,
706 .flags = GENL_ADMIN_PERM,
707 .policy = netlbl_mgmt_genl_policy,
708 .doit = netlbl_mgmt_add,
709 .dumpit = NULL,
710 },
711 {
712 .cmd = NLBL_MGMT_C_REMOVE,
713 .flags = GENL_ADMIN_PERM,
714 .policy = netlbl_mgmt_genl_policy,
715 .doit = netlbl_mgmt_remove,
716 .dumpit = NULL,
717 },
718 {
719 .cmd = NLBL_MGMT_C_LISTALL,
720 .flags = 0,
721 .policy = netlbl_mgmt_genl_policy,
722 .doit = NULL,
723 .dumpit = netlbl_mgmt_listall,
724 },
725 {
726 .cmd = NLBL_MGMT_C_ADDDEF,
727 .flags = GENL_ADMIN_PERM,
728 .policy = netlbl_mgmt_genl_policy,
729 .doit = netlbl_mgmt_adddef,
730 .dumpit = NULL,
731 },
732 {
733 .cmd = NLBL_MGMT_C_REMOVEDEF,
734 .flags = GENL_ADMIN_PERM,
735 .policy = netlbl_mgmt_genl_policy,
736 .doit = netlbl_mgmt_removedef,
737 .dumpit = NULL,
738 },
739 {
740 .cmd = NLBL_MGMT_C_LISTDEF,
741 .flags = 0,
742 .policy = netlbl_mgmt_genl_policy,
743 .doit = netlbl_mgmt_listdef,
744 .dumpit = NULL,
745 },
746 {
747 .cmd = NLBL_MGMT_C_PROTOCOLS,
748 .flags = 0,
749 .policy = netlbl_mgmt_genl_policy,
750 .doit = NULL,
751 .dumpit = netlbl_mgmt_protocols,
752 },
753 {
754 .cmd = NLBL_MGMT_C_VERSION,
755 .flags = 0,
756 .policy = netlbl_mgmt_genl_policy,
757 .doit = netlbl_mgmt_version,
758 .dumpit = NULL,
759 },
760};
761
762/*
763 * NetLabel Generic NETLINK Protocol Functions
764 */
765
766/**
767 * netlbl_mgmt_genl_init - Register the NetLabel management component
768 *
769 * Description:
770 * Register the NetLabel management component with the Generic NETLINK
771 * mechanism. Returns zero on success, negative values on failure.
772 *
773 */
774int __init netlbl_mgmt_genl_init(void)
775{
776 return genl_register_family_with_ops(&netlbl_mgmt_gnl_family,
777 netlbl_mgmt_genl_ops);
778}