tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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->def.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->def.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->def.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->def.cipso = 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->def.type = entry->def.type;
176 if (cipsov4)
177 map->def.cipso = 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->def.type = NETLBL_NLTYPE_ADDRSELECT;
186 entry->def.addrsel = addrmap;
187#if IS_ENABLED(CONFIG_IPV6)
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 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 map->list.mask = *mask;
225 map->list.valid = 1;
226 map->def.type = entry->def.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->def.type = NETLBL_NLTYPE_ADDRSELECT;
235 entry->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 IS_ENABLED(CONFIG_IPV6)
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->def.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, &entry->def.addrsel->list4) {
291 struct netlbl_domaddr4_map *map4;
292 struct in_addr addr_struct;
293
294 nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
295 if (nla_b == NULL)
296 return -ENOMEM;
297
298 addr_struct.s_addr = iter4->addr;
299 ret_val = nla_put(skb, NLBL_MGMT_A_IPV4ADDR,
300 sizeof(struct in_addr),
301 &addr_struct);
302 if (ret_val != 0)
303 return ret_val;
304 addr_struct.s_addr = iter4->mask;
305 ret_val = nla_put(skb, NLBL_MGMT_A_IPV4MASK,
306 sizeof(struct in_addr),
307 &addr_struct);
308 if (ret_val != 0)
309 return ret_val;
310 map4 = netlbl_domhsh_addr4_entry(iter4);
311 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
312 map4->def.type);
313 if (ret_val != 0)
314 return ret_val;
315 switch (map4->def.type) {
316 case NETLBL_NLTYPE_CIPSOV4:
317 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
318 map4->def.cipso->doi);
319 if (ret_val != 0)
320 return ret_val;
321 break;
322 }
323
324 nla_nest_end(skb, nla_b);
325 }
326#if IS_ENABLED(CONFIG_IPV6)
327 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
328 struct netlbl_domaddr6_map *map6;
329
330 nla_b = nla_nest_start(skb, NLBL_MGMT_A_ADDRSELECTOR);
331 if (nla_b == NULL)
332 return -ENOMEM;
333
334 ret_val = nla_put(skb, NLBL_MGMT_A_IPV6ADDR,
335 sizeof(struct in6_addr),
336 &iter6->addr);
337 if (ret_val != 0)
338 return ret_val;
339 ret_val = nla_put(skb, NLBL_MGMT_A_IPV6MASK,
340 sizeof(struct in6_addr),
341 &iter6->mask);
342 if (ret_val != 0)
343 return ret_val;
344 map6 = netlbl_domhsh_addr6_entry(iter6);
345 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
346 map6->def.type);
347 if (ret_val != 0)
348 return ret_val;
349
350 nla_nest_end(skb, nla_b);
351 }
352#endif /* IPv6 */
353
354 nla_nest_end(skb, nla_a);
355 break;
356 case NETLBL_NLTYPE_UNLABELED:
357 ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
358 break;
359 case NETLBL_NLTYPE_CIPSOV4:
360 ret_val = nla_put_u32(skb,NLBL_MGMT_A_PROTOCOL,entry->def.type);
361 if (ret_val != 0)
362 return ret_val;
363 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
364 entry->def.cipso->doi);
365 break;
366 }
367
368 return ret_val;
369}
370
371/*
372 * NetLabel Command Handlers
373 */
374
375/**
376 * netlbl_mgmt_add - Handle an ADD message
377 * @skb: the NETLINK buffer
378 * @info: the Generic NETLINK info block
379 *
380 * Description:
381 * Process a user generated ADD message and add the domains from the message
382 * to the hash table. See netlabel.h for a description of the message format.
383 * Returns zero on success, negative values on failure.
384 *
385 */
386static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
387{
388 struct netlbl_audit audit_info;
389
390 if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
391 (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
392 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
393 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
394 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
395 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
396 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
397 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
398 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
399 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
400 return -EINVAL;
401
402 netlbl_netlink_auditinfo(skb, &audit_info);
403
404 return netlbl_mgmt_add_common(info, &audit_info);
405}
406
407/**
408 * netlbl_mgmt_remove - Handle a REMOVE message
409 * @skb: the NETLINK buffer
410 * @info: the Generic NETLINK info block
411 *
412 * Description:
413 * Process a user generated REMOVE message and remove the specified domain
414 * mappings. Returns zero on success, negative values on failure.
415 *
416 */
417static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
418{
419 char *domain;
420 struct netlbl_audit audit_info;
421
422 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
423 return -EINVAL;
424
425 netlbl_netlink_auditinfo(skb, &audit_info);
426
427 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
428 return netlbl_domhsh_remove(domain, &audit_info);
429}
430
431/**
432 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
433 * @entry: the domain mapping hash table entry
434 * @arg: the netlbl_domhsh_walk_arg structure
435 *
436 * Description:
437 * This function is designed to be used as a callback to the
438 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
439 * message. Returns the size of the message on success, negative values on
440 * failure.
441 *
442 */
443static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
444{
445 int ret_val = -ENOMEM;
446 struct netlbl_domhsh_walk_arg *cb_arg = arg;
447 void *data;
448
449 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
450 cb_arg->seq, &netlbl_mgmt_gnl_family,
451 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
452 if (data == NULL)
453 goto listall_cb_failure;
454
455 ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
456 if (ret_val != 0)
457 goto listall_cb_failure;
458
459 cb_arg->seq++;
460 return genlmsg_end(cb_arg->skb, data);
461
462listall_cb_failure:
463 genlmsg_cancel(cb_arg->skb, data);
464 return ret_val;
465}
466
467/**
468 * netlbl_mgmt_listall - Handle a LISTALL message
469 * @skb: the NETLINK buffer
470 * @cb: the NETLINK callback
471 *
472 * Description:
473 * Process a user generated LISTALL message and dumps the domain hash table in
474 * a form suitable for use in a kernel generated LISTALL message. Returns zero
475 * on success, negative values on failure.
476 *
477 */
478static int netlbl_mgmt_listall(struct sk_buff *skb,
479 struct netlink_callback *cb)
480{
481 struct netlbl_domhsh_walk_arg cb_arg;
482 u32 skip_bkt = cb->args[0];
483 u32 skip_chain = cb->args[1];
484
485 cb_arg.nl_cb = cb;
486 cb_arg.skb = skb;
487 cb_arg.seq = cb->nlh->nlmsg_seq;
488
489 netlbl_domhsh_walk(&skip_bkt,
490 &skip_chain,
491 netlbl_mgmt_listall_cb,
492 &cb_arg);
493
494 cb->args[0] = skip_bkt;
495 cb->args[1] = skip_chain;
496 return skb->len;
497}
498
499/**
500 * netlbl_mgmt_adddef - Handle an ADDDEF message
501 * @skb: the NETLINK buffer
502 * @info: the Generic NETLINK info block
503 *
504 * Description:
505 * Process a user generated ADDDEF message and respond accordingly. Returns
506 * zero on success, negative values on failure.
507 *
508 */
509static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
510{
511 struct netlbl_audit audit_info;
512
513 if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
514 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
515 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
516 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
517 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
518 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
519 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
520 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
521 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
522 return -EINVAL;
523
524 netlbl_netlink_auditinfo(skb, &audit_info);
525
526 return netlbl_mgmt_add_common(info, &audit_info);
527}
528
529/**
530 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
531 * @skb: the NETLINK buffer
532 * @info: the Generic NETLINK info block
533 *
534 * Description:
535 * Process a user generated REMOVEDEF message and remove the default domain
536 * mapping. Returns zero on success, negative values on failure.
537 *
538 */
539static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
540{
541 struct netlbl_audit audit_info;
542
543 netlbl_netlink_auditinfo(skb, &audit_info);
544
545 return netlbl_domhsh_remove_default(&audit_info);
546}
547
548/**
549 * netlbl_mgmt_listdef - Handle a LISTDEF message
550 * @skb: the NETLINK buffer
551 * @info: the Generic NETLINK info block
552 *
553 * Description:
554 * Process a user generated LISTDEF message and dumps the default domain
555 * mapping in a form suitable for use in a kernel generated LISTDEF message.
556 * Returns zero on success, negative values on failure.
557 *
558 */
559static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
560{
561 int ret_val = -ENOMEM;
562 struct sk_buff *ans_skb = NULL;
563 void *data;
564 struct netlbl_dom_map *entry;
565
566 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
567 if (ans_skb == NULL)
568 return -ENOMEM;
569 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
570 0, NLBL_MGMT_C_LISTDEF);
571 if (data == NULL)
572 goto listdef_failure;
573
574 rcu_read_lock();
575 entry = netlbl_domhsh_getentry(NULL);
576 if (entry == NULL) {
577 ret_val = -ENOENT;
578 goto listdef_failure_lock;
579 }
580 ret_val = netlbl_mgmt_listentry(ans_skb, entry);
581 rcu_read_unlock();
582 if (ret_val != 0)
583 goto listdef_failure;
584
585 genlmsg_end(ans_skb, data);
586 return genlmsg_reply(ans_skb, info);
587
588listdef_failure_lock:
589 rcu_read_unlock();
590listdef_failure:
591 kfree_skb(ans_skb);
592 return ret_val;
593}
594
595/**
596 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
597 * @skb: the skb to write to
598 * @cb: the NETLINK callback
599 * @protocol: the NetLabel protocol to use in the message
600 *
601 * Description:
602 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
603 * answer a application's PROTOCOLS message. Returns the size of the message
604 * on success, negative values on failure.
605 *
606 */
607static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
608 struct netlink_callback *cb,
609 u32 protocol)
610{
611 int ret_val = -ENOMEM;
612 void *data;
613
614 data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
615 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
616 NLBL_MGMT_C_PROTOCOLS);
617 if (data == NULL)
618 goto protocols_cb_failure;
619
620 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
621 if (ret_val != 0)
622 goto protocols_cb_failure;
623
624 return genlmsg_end(skb, data);
625
626protocols_cb_failure:
627 genlmsg_cancel(skb, data);
628 return ret_val;
629}
630
631/**
632 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
633 * @skb: the NETLINK buffer
634 * @cb: the NETLINK callback
635 *
636 * Description:
637 * Process a user generated PROTOCOLS message and respond accordingly.
638 *
639 */
640static int netlbl_mgmt_protocols(struct sk_buff *skb,
641 struct netlink_callback *cb)
642{
643 u32 protos_sent = cb->args[0];
644
645 if (protos_sent == 0) {
646 if (netlbl_mgmt_protocols_cb(skb,
647 cb,
648 NETLBL_NLTYPE_UNLABELED) < 0)
649 goto protocols_return;
650 protos_sent++;
651 }
652 if (protos_sent == 1) {
653 if (netlbl_mgmt_protocols_cb(skb,
654 cb,
655 NETLBL_NLTYPE_CIPSOV4) < 0)
656 goto protocols_return;
657 protos_sent++;
658 }
659
660protocols_return:
661 cb->args[0] = protos_sent;
662 return skb->len;
663}
664
665/**
666 * netlbl_mgmt_version - Handle a VERSION message
667 * @skb: the NETLINK buffer
668 * @info: the Generic NETLINK info block
669 *
670 * Description:
671 * Process a user generated VERSION message and respond accordingly. Returns
672 * zero on success, negative values on failure.
673 *
674 */
675static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
676{
677 int ret_val = -ENOMEM;
678 struct sk_buff *ans_skb = NULL;
679 void *data;
680
681 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
682 if (ans_skb == NULL)
683 return -ENOMEM;
684 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
685 0, NLBL_MGMT_C_VERSION);
686 if (data == NULL)
687 goto version_failure;
688
689 ret_val = nla_put_u32(ans_skb,
690 NLBL_MGMT_A_VERSION,
691 NETLBL_PROTO_VERSION);
692 if (ret_val != 0)
693 goto version_failure;
694
695 genlmsg_end(ans_skb, data);
696 return genlmsg_reply(ans_skb, info);
697
698version_failure:
699 kfree_skb(ans_skb);
700 return ret_val;
701}
702
703
704/*
705 * NetLabel Generic NETLINK Command Definitions
706 */
707
708static const struct genl_ops netlbl_mgmt_genl_ops[] = {
709 {
710 .cmd = NLBL_MGMT_C_ADD,
711 .flags = GENL_ADMIN_PERM,
712 .policy = netlbl_mgmt_genl_policy,
713 .doit = netlbl_mgmt_add,
714 .dumpit = NULL,
715 },
716 {
717 .cmd = NLBL_MGMT_C_REMOVE,
718 .flags = GENL_ADMIN_PERM,
719 .policy = netlbl_mgmt_genl_policy,
720 .doit = netlbl_mgmt_remove,
721 .dumpit = NULL,
722 },
723 {
724 .cmd = NLBL_MGMT_C_LISTALL,
725 .flags = 0,
726 .policy = netlbl_mgmt_genl_policy,
727 .doit = NULL,
728 .dumpit = netlbl_mgmt_listall,
729 },
730 {
731 .cmd = NLBL_MGMT_C_ADDDEF,
732 .flags = GENL_ADMIN_PERM,
733 .policy = netlbl_mgmt_genl_policy,
734 .doit = netlbl_mgmt_adddef,
735 .dumpit = NULL,
736 },
737 {
738 .cmd = NLBL_MGMT_C_REMOVEDEF,
739 .flags = GENL_ADMIN_PERM,
740 .policy = netlbl_mgmt_genl_policy,
741 .doit = netlbl_mgmt_removedef,
742 .dumpit = NULL,
743 },
744 {
745 .cmd = NLBL_MGMT_C_LISTDEF,
746 .flags = 0,
747 .policy = netlbl_mgmt_genl_policy,
748 .doit = netlbl_mgmt_listdef,
749 .dumpit = NULL,
750 },
751 {
752 .cmd = NLBL_MGMT_C_PROTOCOLS,
753 .flags = 0,
754 .policy = netlbl_mgmt_genl_policy,
755 .doit = NULL,
756 .dumpit = netlbl_mgmt_protocols,
757 },
758 {
759 .cmd = NLBL_MGMT_C_VERSION,
760 .flags = 0,
761 .policy = netlbl_mgmt_genl_policy,
762 .doit = netlbl_mgmt_version,
763 .dumpit = NULL,
764 },
765};
766
767/*
768 * NetLabel Generic NETLINK Protocol Functions
769 */
770
771/**
772 * netlbl_mgmt_genl_init - Register the NetLabel management component
773 *
774 * Description:
775 * Register the NetLabel management component with the Generic NETLINK
776 * mechanism. Returns zero on success, negative values on failure.
777 *
778 */
779int __init netlbl_mgmt_genl_init(void)
780{
781 return genl_register_family_with_ops(&netlbl_mgmt_gnl_family,
782 netlbl_mgmt_genl_ops);
783}