Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NetLabel Management Support
4 *
5 * This file defines the management functions for the NetLabel system. The
6 * NetLabel system manages static and dynamic label mappings for network
7 * protocols such as CIPSO and RIPSO.
8 *
9 * Author: Paul Moore <paul@paul-moore.com>
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 */
15
16#include <linux/types.h>
17#include <linux/socket.h>
18#include <linux/string.h>
19#include <linux/skbuff.h>
20#include <linux/in.h>
21#include <linux/in6.h>
22#include <linux/slab.h>
23#include <net/sock.h>
24#include <net/netlink.h>
25#include <net/genetlink.h>
26#include <net/ip.h>
27#include <net/ipv6.h>
28#include <net/netlabel.h>
29#include <net/cipso_ipv4.h>
30#include <net/calipso.h>
31#include <linux/atomic.h>
32
33#include "netlabel_calipso.h"
34#include "netlabel_domainhash.h"
35#include "netlabel_user.h"
36#include "netlabel_mgmt.h"
37
38/* NetLabel configured protocol counter */
39atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
40
41/* Argument struct for netlbl_domhsh_walk() */
42struct netlbl_domhsh_walk_arg {
43 struct netlink_callback *nl_cb;
44 struct sk_buff *skb;
45 u32 seq;
46};
47
48/* NetLabel Generic NETLINK CIPSOv4 family */
49static struct genl_family netlbl_mgmt_gnl_family;
50
51/* NetLabel Netlink attribute policy */
52static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
53 [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
54 [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
55 [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
56 [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
57 [NLBL_MGMT_A_FAMILY] = { .type = NLA_U16 },
58 [NLBL_MGMT_A_CLPDOI] = { .type = NLA_U32 },
59};
60
61/*
62 * Helper Functions
63 */
64
65/**
66 * netlbl_mgmt_add_common - Handle an ADD message
67 * @info: the Generic NETLINK info block
68 * @audit_info: NetLabel audit information
69 *
70 * Description:
71 * Helper function for the ADD and ADDDEF messages to add the domain mappings
72 * from the message to the hash table. See netlabel.h for a description of the
73 * message format. Returns zero on success, negative values on failure.
74 *
75 */
76static int netlbl_mgmt_add_common(struct genl_info *info,
77 struct netlbl_audit *audit_info)
78{
79 void *pmap = NULL;
80 int ret_val = -EINVAL;
81 struct netlbl_domaddr_map *addrmap = NULL;
82 struct cipso_v4_doi *cipsov4 = NULL;
83#if IS_ENABLED(CONFIG_IPV6)
84 struct calipso_doi *calipso = NULL;
85#endif
86 u32 tmp_val;
87 struct netlbl_dom_map *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
88
89 if (!entry)
90 return -ENOMEM;
91 entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
92 if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
93 size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
94 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
95 if (entry->domain == NULL) {
96 ret_val = -ENOMEM;
97 goto add_free_entry;
98 }
99 nla_strscpy(entry->domain,
100 info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
101 }
102
103 /* NOTE: internally we allow/use a entry->def.type value of
104 * NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
105 * to pass that as a protocol value because we need to know the
106 * "real" protocol */
107
108 switch (entry->def.type) {
109 case NETLBL_NLTYPE_UNLABELED:
110 entry->family =
111 nla_get_u16_default(info->attrs[NLBL_MGMT_A_FAMILY],
112 AF_UNSPEC);
113 break;
114 case NETLBL_NLTYPE_CIPSOV4:
115 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
116 goto add_free_domain;
117
118 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
119 cipsov4 = cipso_v4_doi_getdef(tmp_val);
120 if (cipsov4 == NULL)
121 goto add_free_domain;
122 entry->family = AF_INET;
123 entry->def.cipso = cipsov4;
124 break;
125#if IS_ENABLED(CONFIG_IPV6)
126 case NETLBL_NLTYPE_CALIPSO:
127 if (!info->attrs[NLBL_MGMT_A_CLPDOI])
128 goto add_free_domain;
129
130 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CLPDOI]);
131 calipso = calipso_doi_getdef(tmp_val);
132 if (calipso == NULL)
133 goto add_free_domain;
134 entry->family = AF_INET6;
135 entry->def.calipso = calipso;
136 break;
137#endif /* IPv6 */
138 default:
139 goto add_free_domain;
140 }
141
142 if ((entry->family == AF_INET && info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
143 (entry->family == AF_INET6 && info->attrs[NLBL_MGMT_A_IPV4ADDR]))
144 goto add_doi_put_def;
145
146 if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
147 struct in_addr *addr;
148 struct in_addr *mask;
149 struct netlbl_domaddr4_map *map;
150
151 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
152 if (addrmap == NULL) {
153 ret_val = -ENOMEM;
154 goto add_doi_put_def;
155 }
156 INIT_LIST_HEAD(&addrmap->list4);
157 INIT_LIST_HEAD(&addrmap->list6);
158
159 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
160 sizeof(struct in_addr)) {
161 ret_val = -EINVAL;
162 goto add_free_addrmap;
163 }
164 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
165 sizeof(struct in_addr)) {
166 ret_val = -EINVAL;
167 goto add_free_addrmap;
168 }
169 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
170 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
171
172 map = kzalloc(sizeof(*map), GFP_KERNEL);
173 if (map == NULL) {
174 ret_val = -ENOMEM;
175 goto add_free_addrmap;
176 }
177 pmap = map;
178 map->list.addr = addr->s_addr & mask->s_addr;
179 map->list.mask = mask->s_addr;
180 map->list.valid = 1;
181 map->def.type = entry->def.type;
182 if (cipsov4)
183 map->def.cipso = cipsov4;
184
185 ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
186 if (ret_val != 0)
187 goto add_free_map;
188
189 entry->family = AF_INET;
190 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
191 entry->def.addrsel = addrmap;
192#if IS_ENABLED(CONFIG_IPV6)
193 } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
194 struct in6_addr *addr;
195 struct in6_addr *mask;
196 struct netlbl_domaddr6_map *map;
197
198 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
199 if (addrmap == NULL) {
200 ret_val = -ENOMEM;
201 goto add_doi_put_def;
202 }
203 INIT_LIST_HEAD(&addrmap->list4);
204 INIT_LIST_HEAD(&addrmap->list6);
205
206 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
207 sizeof(struct in6_addr)) {
208 ret_val = -EINVAL;
209 goto add_free_addrmap;
210 }
211 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
212 sizeof(struct in6_addr)) {
213 ret_val = -EINVAL;
214 goto add_free_addrmap;
215 }
216 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
217 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
218
219 map = kzalloc(sizeof(*map), GFP_KERNEL);
220 if (map == NULL) {
221 ret_val = -ENOMEM;
222 goto add_free_addrmap;
223 }
224 pmap = map;
225 map->list.addr = *addr;
226 map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
227 map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
228 map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
229 map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
230 map->list.mask = *mask;
231 map->list.valid = 1;
232 map->def.type = entry->def.type;
233 if (calipso)
234 map->def.calipso = calipso;
235
236 ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
237 if (ret_val != 0)
238 goto add_free_map;
239
240 entry->family = AF_INET6;
241 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
242 entry->def.addrsel = addrmap;
243#endif /* IPv6 */
244 }
245
246 ret_val = netlbl_domhsh_add(entry, audit_info);
247 if (ret_val != 0)
248 goto add_free_map;
249
250 return 0;
251
252add_free_map:
253 kfree(pmap);
254add_free_addrmap:
255 kfree(addrmap);
256add_doi_put_def:
257 cipso_v4_doi_putdef(cipsov4);
258#if IS_ENABLED(CONFIG_IPV6)
259 calipso_doi_putdef(calipso);
260#endif
261add_free_domain:
262 kfree(entry->domain);
263add_free_entry:
264 kfree(entry);
265 return ret_val;
266}
267
268/**
269 * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
270 * @skb: the NETLINK buffer
271 * @entry: the map entry
272 *
273 * Description:
274 * This function is a helper function used by the LISTALL and LISTDEF command
275 * handlers. The caller is responsible for ensuring that the RCU read lock
276 * is held. Returns zero on success, negative values on failure.
277 *
278 */
279static int netlbl_mgmt_listentry(struct sk_buff *skb,
280 struct netlbl_dom_map *entry)
281{
282 int ret_val = 0;
283 struct nlattr *nla_a;
284 struct nlattr *nla_b;
285 struct netlbl_af4list *iter4;
286#if IS_ENABLED(CONFIG_IPV6)
287 struct netlbl_af6list *iter6;
288#endif
289
290 if (entry->domain != NULL) {
291 ret_val = nla_put_string(skb,
292 NLBL_MGMT_A_DOMAIN, entry->domain);
293 if (ret_val != 0)
294 return ret_val;
295 }
296
297 ret_val = nla_put_u16(skb, NLBL_MGMT_A_FAMILY, entry->family);
298 if (ret_val != 0)
299 return ret_val;
300
301 switch (entry->def.type) {
302 case NETLBL_NLTYPE_ADDRSELECT:
303 nla_a = nla_nest_start_noflag(skb, NLBL_MGMT_A_SELECTORLIST);
304 if (nla_a == NULL)
305 return -ENOMEM;
306
307 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
308 struct netlbl_domaddr4_map *map4;
309 struct in_addr addr_struct;
310
311 nla_b = nla_nest_start_noflag(skb,
312 NLBL_MGMT_A_ADDRSELECTOR);
313 if (nla_b == NULL)
314 return -ENOMEM;
315
316 addr_struct.s_addr = iter4->addr;
317 ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4ADDR,
318 addr_struct.s_addr);
319 if (ret_val != 0)
320 return ret_val;
321 addr_struct.s_addr = iter4->mask;
322 ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4MASK,
323 addr_struct.s_addr);
324 if (ret_val != 0)
325 return ret_val;
326 map4 = netlbl_domhsh_addr4_entry(iter4);
327 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
328 map4->def.type);
329 if (ret_val != 0)
330 return ret_val;
331 switch (map4->def.type) {
332 case NETLBL_NLTYPE_CIPSOV4:
333 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
334 map4->def.cipso->doi);
335 if (ret_val != 0)
336 return ret_val;
337 break;
338 }
339
340 nla_nest_end(skb, nla_b);
341 }
342#if IS_ENABLED(CONFIG_IPV6)
343 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
344 struct netlbl_domaddr6_map *map6;
345
346 nla_b = nla_nest_start_noflag(skb,
347 NLBL_MGMT_A_ADDRSELECTOR);
348 if (nla_b == NULL)
349 return -ENOMEM;
350
351 ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6ADDR,
352 &iter6->addr);
353 if (ret_val != 0)
354 return ret_val;
355 ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6MASK,
356 &iter6->mask);
357 if (ret_val != 0)
358 return ret_val;
359 map6 = netlbl_domhsh_addr6_entry(iter6);
360 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
361 map6->def.type);
362 if (ret_val != 0)
363 return ret_val;
364
365 switch (map6->def.type) {
366 case NETLBL_NLTYPE_CALIPSO:
367 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
368 map6->def.calipso->doi);
369 if (ret_val != 0)
370 return ret_val;
371 break;
372 }
373
374 nla_nest_end(skb, nla_b);
375 }
376#endif /* IPv6 */
377
378 nla_nest_end(skb, nla_a);
379 break;
380 case NETLBL_NLTYPE_UNLABELED:
381 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
382 entry->def.type);
383 break;
384 case NETLBL_NLTYPE_CIPSOV4:
385 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
386 entry->def.type);
387 if (ret_val != 0)
388 return ret_val;
389 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
390 entry->def.cipso->doi);
391 break;
392 case NETLBL_NLTYPE_CALIPSO:
393 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
394 entry->def.type);
395 if (ret_val != 0)
396 return ret_val;
397 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
398 entry->def.calipso->doi);
399 break;
400 }
401
402 return ret_val;
403}
404
405/*
406 * NetLabel Command Handlers
407 */
408
409/**
410 * netlbl_mgmt_add - Handle an ADD message
411 * @skb: the NETLINK buffer
412 * @info: the Generic NETLINK info block
413 *
414 * Description:
415 * Process a user generated ADD message and add the domains from the message
416 * to the hash table. See netlabel.h for a description of the message format.
417 * Returns zero on success, negative values on failure.
418 *
419 */
420static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
421{
422 struct netlbl_audit audit_info;
423
424 if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
425 (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
426 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
427 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
428 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
429 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
430 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
431 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
432 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
433 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
434 return -EINVAL;
435
436 netlbl_netlink_auditinfo(&audit_info);
437
438 return netlbl_mgmt_add_common(info, &audit_info);
439}
440
441/**
442 * netlbl_mgmt_remove - Handle a REMOVE message
443 * @skb: the NETLINK buffer
444 * @info: the Generic NETLINK info block
445 *
446 * Description:
447 * Process a user generated REMOVE message and remove the specified domain
448 * mappings. Returns zero on success, negative values on failure.
449 *
450 */
451static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
452{
453 char *domain;
454 struct netlbl_audit audit_info;
455
456 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
457 return -EINVAL;
458
459 netlbl_netlink_auditinfo(&audit_info);
460
461 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
462 return netlbl_domhsh_remove(domain, AF_UNSPEC, &audit_info);
463}
464
465/**
466 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
467 * @entry: the domain mapping hash table entry
468 * @arg: the netlbl_domhsh_walk_arg structure
469 *
470 * Description:
471 * This function is designed to be used as a callback to the
472 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
473 * message. Returns the size of the message on success, negative values on
474 * failure.
475 *
476 */
477static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
478{
479 int ret_val = -ENOMEM;
480 struct netlbl_domhsh_walk_arg *cb_arg = arg;
481 void *data;
482
483 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
484 cb_arg->seq, &netlbl_mgmt_gnl_family,
485 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
486 if (data == NULL)
487 goto listall_cb_failure;
488
489 ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
490 if (ret_val != 0)
491 goto listall_cb_failure;
492
493 cb_arg->seq++;
494 genlmsg_end(cb_arg->skb, data);
495 return 0;
496
497listall_cb_failure:
498 genlmsg_cancel(cb_arg->skb, data);
499 return ret_val;
500}
501
502/**
503 * netlbl_mgmt_listall - Handle a LISTALL message
504 * @skb: the NETLINK buffer
505 * @cb: the NETLINK callback
506 *
507 * Description:
508 * Process a user generated LISTALL message and dumps the domain hash table in
509 * a form suitable for use in a kernel generated LISTALL message. Returns zero
510 * on success, negative values on failure.
511 *
512 */
513static int netlbl_mgmt_listall(struct sk_buff *skb,
514 struct netlink_callback *cb)
515{
516 struct netlbl_domhsh_walk_arg cb_arg;
517 u32 skip_bkt = cb->args[0];
518 u32 skip_chain = cb->args[1];
519
520 cb_arg.nl_cb = cb;
521 cb_arg.skb = skb;
522 cb_arg.seq = cb->nlh->nlmsg_seq;
523
524 netlbl_domhsh_walk(&skip_bkt,
525 &skip_chain,
526 netlbl_mgmt_listall_cb,
527 &cb_arg);
528
529 cb->args[0] = skip_bkt;
530 cb->args[1] = skip_chain;
531 return skb->len;
532}
533
534/**
535 * netlbl_mgmt_adddef - Handle an ADDDEF message
536 * @skb: the NETLINK buffer
537 * @info: the Generic NETLINK info block
538 *
539 * Description:
540 * Process a user generated ADDDEF message and respond accordingly. Returns
541 * zero on success, negative values on failure.
542 *
543 */
544static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
545{
546 struct netlbl_audit audit_info;
547
548 if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
549 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
550 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
551 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
552 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
553 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
554 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
555 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
556 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
557 return -EINVAL;
558
559 netlbl_netlink_auditinfo(&audit_info);
560
561 return netlbl_mgmt_add_common(info, &audit_info);
562}
563
564/**
565 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
566 * @skb: the NETLINK buffer
567 * @info: the Generic NETLINK info block
568 *
569 * Description:
570 * Process a user generated REMOVEDEF message and remove the default domain
571 * mapping. Returns zero on success, negative values on failure.
572 *
573 */
574static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
575{
576 struct netlbl_audit audit_info;
577
578 netlbl_netlink_auditinfo(&audit_info);
579
580 return netlbl_domhsh_remove_default(AF_UNSPEC, &audit_info);
581}
582
583/**
584 * netlbl_mgmt_listdef - Handle a LISTDEF message
585 * @skb: the NETLINK buffer
586 * @info: the Generic NETLINK info block
587 *
588 * Description:
589 * Process a user generated LISTDEF message and dumps the default domain
590 * mapping in a form suitable for use in a kernel generated LISTDEF message.
591 * Returns zero on success, negative values on failure.
592 *
593 */
594static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
595{
596 int ret_val = -ENOMEM;
597 struct sk_buff *ans_skb = NULL;
598 void *data;
599 struct netlbl_dom_map *entry;
600 u16 family;
601
602 family = nla_get_u16_default(info->attrs[NLBL_MGMT_A_FAMILY], AF_INET);
603
604 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
605 if (ans_skb == NULL)
606 return -ENOMEM;
607 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
608 0, NLBL_MGMT_C_LISTDEF);
609 if (data == NULL)
610 goto listdef_failure;
611
612 rcu_read_lock();
613 entry = netlbl_domhsh_getentry(NULL, family);
614 if (entry == NULL) {
615 ret_val = -ENOENT;
616 goto listdef_failure_lock;
617 }
618 ret_val = netlbl_mgmt_listentry(ans_skb, entry);
619 rcu_read_unlock();
620 if (ret_val != 0)
621 goto listdef_failure;
622
623 genlmsg_end(ans_skb, data);
624 return genlmsg_reply(ans_skb, info);
625
626listdef_failure_lock:
627 rcu_read_unlock();
628listdef_failure:
629 kfree_skb(ans_skb);
630 return ret_val;
631}
632
633/**
634 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
635 * @skb: the skb to write to
636 * @cb: the NETLINK callback
637 * @protocol: the NetLabel protocol to use in the message
638 *
639 * Description:
640 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
641 * answer a application's PROTOCOLS message. Returns the size of the message
642 * on success, negative values on failure.
643 *
644 */
645static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
646 struct netlink_callback *cb,
647 u32 protocol)
648{
649 int ret_val = -ENOMEM;
650 void *data;
651
652 data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
653 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
654 NLBL_MGMT_C_PROTOCOLS);
655 if (data == NULL)
656 goto protocols_cb_failure;
657
658 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
659 if (ret_val != 0)
660 goto protocols_cb_failure;
661
662 genlmsg_end(skb, data);
663 return 0;
664
665protocols_cb_failure:
666 genlmsg_cancel(skb, data);
667 return ret_val;
668}
669
670/**
671 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
672 * @skb: the NETLINK buffer
673 * @cb: the NETLINK callback
674 *
675 * Description:
676 * Process a user generated PROTOCOLS message and respond accordingly.
677 *
678 */
679static int netlbl_mgmt_protocols(struct sk_buff *skb,
680 struct netlink_callback *cb)
681{
682 u32 protos_sent = cb->args[0];
683
684 if (protos_sent == 0) {
685 if (netlbl_mgmt_protocols_cb(skb,
686 cb,
687 NETLBL_NLTYPE_UNLABELED) < 0)
688 goto protocols_return;
689 protos_sent++;
690 }
691 if (protos_sent == 1) {
692 if (netlbl_mgmt_protocols_cb(skb,
693 cb,
694 NETLBL_NLTYPE_CIPSOV4) < 0)
695 goto protocols_return;
696 protos_sent++;
697 }
698#if IS_ENABLED(CONFIG_IPV6)
699 if (protos_sent == 2) {
700 if (netlbl_mgmt_protocols_cb(skb,
701 cb,
702 NETLBL_NLTYPE_CALIPSO) < 0)
703 goto protocols_return;
704 protos_sent++;
705 }
706#endif
707
708protocols_return:
709 cb->args[0] = protos_sent;
710 return skb->len;
711}
712
713/**
714 * netlbl_mgmt_version - Handle a VERSION message
715 * @skb: the NETLINK buffer
716 * @info: the Generic NETLINK info block
717 *
718 * Description:
719 * Process a user generated VERSION message and respond accordingly. Returns
720 * zero on success, negative values on failure.
721 *
722 */
723static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
724{
725 int ret_val = -ENOMEM;
726 struct sk_buff *ans_skb = NULL;
727 void *data;
728
729 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
730 if (ans_skb == NULL)
731 return -ENOMEM;
732 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
733 0, NLBL_MGMT_C_VERSION);
734 if (data == NULL)
735 goto version_failure;
736
737 ret_val = nla_put_u32(ans_skb,
738 NLBL_MGMT_A_VERSION,
739 NETLBL_PROTO_VERSION);
740 if (ret_val != 0)
741 goto version_failure;
742
743 genlmsg_end(ans_skb, data);
744 return genlmsg_reply(ans_skb, info);
745
746version_failure:
747 kfree_skb(ans_skb);
748 return ret_val;
749}
750
751
752/*
753 * NetLabel Generic NETLINK Command Definitions
754 */
755
756static const struct genl_small_ops netlbl_mgmt_genl_ops[] = {
757 {
758 .cmd = NLBL_MGMT_C_ADD,
759 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
760 .flags = GENL_ADMIN_PERM,
761 .doit = netlbl_mgmt_add,
762 .dumpit = NULL,
763 },
764 {
765 .cmd = NLBL_MGMT_C_REMOVE,
766 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
767 .flags = GENL_ADMIN_PERM,
768 .doit = netlbl_mgmt_remove,
769 .dumpit = NULL,
770 },
771 {
772 .cmd = NLBL_MGMT_C_LISTALL,
773 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
774 .flags = 0,
775 .doit = NULL,
776 .dumpit = netlbl_mgmt_listall,
777 },
778 {
779 .cmd = NLBL_MGMT_C_ADDDEF,
780 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
781 .flags = GENL_ADMIN_PERM,
782 .doit = netlbl_mgmt_adddef,
783 .dumpit = NULL,
784 },
785 {
786 .cmd = NLBL_MGMT_C_REMOVEDEF,
787 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
788 .flags = GENL_ADMIN_PERM,
789 .doit = netlbl_mgmt_removedef,
790 .dumpit = NULL,
791 },
792 {
793 .cmd = NLBL_MGMT_C_LISTDEF,
794 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
795 .flags = 0,
796 .doit = netlbl_mgmt_listdef,
797 .dumpit = NULL,
798 },
799 {
800 .cmd = NLBL_MGMT_C_PROTOCOLS,
801 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
802 .flags = 0,
803 .doit = NULL,
804 .dumpit = netlbl_mgmt_protocols,
805 },
806 {
807 .cmd = NLBL_MGMT_C_VERSION,
808 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
809 .flags = 0,
810 .doit = netlbl_mgmt_version,
811 .dumpit = NULL,
812 },
813};
814
815static struct genl_family netlbl_mgmt_gnl_family __ro_after_init = {
816 .hdrsize = 0,
817 .name = NETLBL_NLTYPE_MGMT_NAME,
818 .version = NETLBL_PROTO_VERSION,
819 .maxattr = NLBL_MGMT_A_MAX,
820 .policy = netlbl_mgmt_genl_policy,
821 .module = THIS_MODULE,
822 .small_ops = netlbl_mgmt_genl_ops,
823 .n_small_ops = ARRAY_SIZE(netlbl_mgmt_genl_ops),
824 .resv_start_op = NLBL_MGMT_C_VERSION + 1,
825};
826
827/*
828 * NetLabel Generic NETLINK Protocol Functions
829 */
830
831/**
832 * netlbl_mgmt_genl_init - Register the NetLabel management component
833 *
834 * Description:
835 * Register the NetLabel management component with the Generic NETLINK
836 * mechanism. Returns zero on success, negative values on failure.
837 *
838 */
839int __init netlbl_mgmt_genl_init(void)
840{
841 return genl_register_family(&netlbl_mgmt_gnl_family);
842}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NetLabel Management Support
4 *
5 * This file defines the management functions for the NetLabel system. The
6 * NetLabel system manages static and dynamic label mappings for network
7 * protocols such as CIPSO and RIPSO.
8 *
9 * Author: Paul Moore <paul@paul-moore.com>
10 */
11
12/*
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
14 */
15
16#include <linux/types.h>
17#include <linux/socket.h>
18#include <linux/string.h>
19#include <linux/skbuff.h>
20#include <linux/in.h>
21#include <linux/in6.h>
22#include <linux/slab.h>
23#include <net/sock.h>
24#include <net/netlink.h>
25#include <net/genetlink.h>
26#include <net/ip.h>
27#include <net/ipv6.h>
28#include <net/netlabel.h>
29#include <net/cipso_ipv4.h>
30#include <net/calipso.h>
31#include <linux/atomic.h>
32
33#include "netlabel_calipso.h"
34#include "netlabel_domainhash.h"
35#include "netlabel_user.h"
36#include "netlabel_mgmt.h"
37
38/* NetLabel configured protocol counter */
39atomic_t netlabel_mgmt_protocount = ATOMIC_INIT(0);
40
41/* Argument struct for netlbl_domhsh_walk() */
42struct netlbl_domhsh_walk_arg {
43 struct netlink_callback *nl_cb;
44 struct sk_buff *skb;
45 u32 seq;
46};
47
48/* NetLabel Generic NETLINK CIPSOv4 family */
49static struct genl_family netlbl_mgmt_gnl_family;
50
51/* NetLabel Netlink attribute policy */
52static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = {
53 [NLBL_MGMT_A_DOMAIN] = { .type = NLA_NUL_STRING },
54 [NLBL_MGMT_A_PROTOCOL] = { .type = NLA_U32 },
55 [NLBL_MGMT_A_VERSION] = { .type = NLA_U32 },
56 [NLBL_MGMT_A_CV4DOI] = { .type = NLA_U32 },
57 [NLBL_MGMT_A_FAMILY] = { .type = NLA_U16 },
58 [NLBL_MGMT_A_CLPDOI] = { .type = NLA_U32 },
59};
60
61/*
62 * Helper Functions
63 */
64
65/**
66 * netlbl_mgmt_add - Handle an ADD message
67 * @info: the Generic NETLINK info block
68 * @audit_info: NetLabel audit information
69 *
70 * Description:
71 * Helper function for the ADD and ADDDEF messages to add the domain mappings
72 * from the message to the hash table. See netlabel.h for a description of the
73 * message format. Returns zero on success, negative values on failure.
74 *
75 */
76static int netlbl_mgmt_add_common(struct genl_info *info,
77 struct netlbl_audit *audit_info)
78{
79 int ret_val = -EINVAL;
80 struct netlbl_domaddr_map *addrmap = NULL;
81 struct cipso_v4_doi *cipsov4 = NULL;
82#if IS_ENABLED(CONFIG_IPV6)
83 struct calipso_doi *calipso = NULL;
84#endif
85 u32 tmp_val;
86 struct netlbl_dom_map *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
87
88 if (!entry)
89 return -ENOMEM;
90 entry->def.type = nla_get_u32(info->attrs[NLBL_MGMT_A_PROTOCOL]);
91 if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
92 size_t tmp_size = nla_len(info->attrs[NLBL_MGMT_A_DOMAIN]);
93 entry->domain = kmalloc(tmp_size, GFP_KERNEL);
94 if (entry->domain == NULL) {
95 ret_val = -ENOMEM;
96 goto add_free_entry;
97 }
98 nla_strlcpy(entry->domain,
99 info->attrs[NLBL_MGMT_A_DOMAIN], tmp_size);
100 }
101
102 /* NOTE: internally we allow/use a entry->def.type value of
103 * NETLBL_NLTYPE_ADDRSELECT but we don't currently allow users
104 * to pass that as a protocol value because we need to know the
105 * "real" protocol */
106
107 switch (entry->def.type) {
108 case NETLBL_NLTYPE_UNLABELED:
109 if (info->attrs[NLBL_MGMT_A_FAMILY])
110 entry->family =
111 nla_get_u16(info->attrs[NLBL_MGMT_A_FAMILY]);
112 else
113 entry->family = AF_UNSPEC;
114 break;
115 case NETLBL_NLTYPE_CIPSOV4:
116 if (!info->attrs[NLBL_MGMT_A_CV4DOI])
117 goto add_free_domain;
118
119 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
120 cipsov4 = cipso_v4_doi_getdef(tmp_val);
121 if (cipsov4 == NULL)
122 goto add_free_domain;
123 entry->family = AF_INET;
124 entry->def.cipso = cipsov4;
125 break;
126#if IS_ENABLED(CONFIG_IPV6)
127 case NETLBL_NLTYPE_CALIPSO:
128 if (!info->attrs[NLBL_MGMT_A_CLPDOI])
129 goto add_free_domain;
130
131 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CLPDOI]);
132 calipso = calipso_doi_getdef(tmp_val);
133 if (calipso == NULL)
134 goto add_free_domain;
135 entry->family = AF_INET6;
136 entry->def.calipso = calipso;
137 break;
138#endif /* IPv6 */
139 default:
140 goto add_free_domain;
141 }
142
143 if ((entry->family == AF_INET && info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
144 (entry->family == AF_INET6 && info->attrs[NLBL_MGMT_A_IPV4ADDR]))
145 goto add_doi_put_def;
146
147 if (info->attrs[NLBL_MGMT_A_IPV4ADDR]) {
148 struct in_addr *addr;
149 struct in_addr *mask;
150 struct netlbl_domaddr4_map *map;
151
152 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
153 if (addrmap == NULL) {
154 ret_val = -ENOMEM;
155 goto add_doi_put_def;
156 }
157 INIT_LIST_HEAD(&addrmap->list4);
158 INIT_LIST_HEAD(&addrmap->list6);
159
160 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4ADDR]) !=
161 sizeof(struct in_addr)) {
162 ret_val = -EINVAL;
163 goto add_free_addrmap;
164 }
165 if (nla_len(info->attrs[NLBL_MGMT_A_IPV4MASK]) !=
166 sizeof(struct in_addr)) {
167 ret_val = -EINVAL;
168 goto add_free_addrmap;
169 }
170 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV4ADDR]);
171 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV4MASK]);
172
173 map = kzalloc(sizeof(*map), GFP_KERNEL);
174 if (map == NULL) {
175 ret_val = -ENOMEM;
176 goto add_free_addrmap;
177 }
178 map->list.addr = addr->s_addr & mask->s_addr;
179 map->list.mask = mask->s_addr;
180 map->list.valid = 1;
181 map->def.type = entry->def.type;
182 if (cipsov4)
183 map->def.cipso = cipsov4;
184
185 ret_val = netlbl_af4list_add(&map->list, &addrmap->list4);
186 if (ret_val != 0) {
187 kfree(map);
188 goto add_free_addrmap;
189 }
190
191 entry->family = AF_INET;
192 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
193 entry->def.addrsel = addrmap;
194#if IS_ENABLED(CONFIG_IPV6)
195 } else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
196 struct in6_addr *addr;
197 struct in6_addr *mask;
198 struct netlbl_domaddr6_map *map;
199
200 addrmap = kzalloc(sizeof(*addrmap), GFP_KERNEL);
201 if (addrmap == NULL) {
202 ret_val = -ENOMEM;
203 goto add_doi_put_def;
204 }
205 INIT_LIST_HEAD(&addrmap->list4);
206 INIT_LIST_HEAD(&addrmap->list6);
207
208 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6ADDR]) !=
209 sizeof(struct in6_addr)) {
210 ret_val = -EINVAL;
211 goto add_free_addrmap;
212 }
213 if (nla_len(info->attrs[NLBL_MGMT_A_IPV6MASK]) !=
214 sizeof(struct in6_addr)) {
215 ret_val = -EINVAL;
216 goto add_free_addrmap;
217 }
218 addr = nla_data(info->attrs[NLBL_MGMT_A_IPV6ADDR]);
219 mask = nla_data(info->attrs[NLBL_MGMT_A_IPV6MASK]);
220
221 map = kzalloc(sizeof(*map), GFP_KERNEL);
222 if (map == NULL) {
223 ret_val = -ENOMEM;
224 goto add_free_addrmap;
225 }
226 map->list.addr = *addr;
227 map->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
228 map->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
229 map->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
230 map->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
231 map->list.mask = *mask;
232 map->list.valid = 1;
233 map->def.type = entry->def.type;
234 if (calipso)
235 map->def.calipso = calipso;
236
237 ret_val = netlbl_af6list_add(&map->list, &addrmap->list6);
238 if (ret_val != 0) {
239 kfree(map);
240 goto add_free_addrmap;
241 }
242
243 entry->family = AF_INET6;
244 entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
245 entry->def.addrsel = addrmap;
246#endif /* IPv6 */
247 }
248
249 ret_val = netlbl_domhsh_add(entry, audit_info);
250 if (ret_val != 0)
251 goto add_free_addrmap;
252
253 return 0;
254
255add_free_addrmap:
256 kfree(addrmap);
257add_doi_put_def:
258 cipso_v4_doi_putdef(cipsov4);
259#if IS_ENABLED(CONFIG_IPV6)
260 calipso_doi_putdef(calipso);
261#endif
262add_free_domain:
263 kfree(entry->domain);
264add_free_entry:
265 kfree(entry);
266 return ret_val;
267}
268
269/**
270 * netlbl_mgmt_listentry - List a NetLabel/LSM domain map entry
271 * @skb: the NETLINK buffer
272 * @entry: the map entry
273 *
274 * Description:
275 * This function is a helper function used by the LISTALL and LISTDEF command
276 * handlers. The caller is responsible for ensuring that the RCU read lock
277 * is held. Returns zero on success, negative values on failure.
278 *
279 */
280static int netlbl_mgmt_listentry(struct sk_buff *skb,
281 struct netlbl_dom_map *entry)
282{
283 int ret_val = 0;
284 struct nlattr *nla_a;
285 struct nlattr *nla_b;
286 struct netlbl_af4list *iter4;
287#if IS_ENABLED(CONFIG_IPV6)
288 struct netlbl_af6list *iter6;
289#endif
290
291 if (entry->domain != NULL) {
292 ret_val = nla_put_string(skb,
293 NLBL_MGMT_A_DOMAIN, entry->domain);
294 if (ret_val != 0)
295 return ret_val;
296 }
297
298 ret_val = nla_put_u16(skb, NLBL_MGMT_A_FAMILY, entry->family);
299 if (ret_val != 0)
300 return ret_val;
301
302 switch (entry->def.type) {
303 case NETLBL_NLTYPE_ADDRSELECT:
304 nla_a = nla_nest_start_noflag(skb, NLBL_MGMT_A_SELECTORLIST);
305 if (nla_a == NULL)
306 return -ENOMEM;
307
308 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) {
309 struct netlbl_domaddr4_map *map4;
310 struct in_addr addr_struct;
311
312 nla_b = nla_nest_start_noflag(skb,
313 NLBL_MGMT_A_ADDRSELECTOR);
314 if (nla_b == NULL)
315 return -ENOMEM;
316
317 addr_struct.s_addr = iter4->addr;
318 ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4ADDR,
319 addr_struct.s_addr);
320 if (ret_val != 0)
321 return ret_val;
322 addr_struct.s_addr = iter4->mask;
323 ret_val = nla_put_in_addr(skb, NLBL_MGMT_A_IPV4MASK,
324 addr_struct.s_addr);
325 if (ret_val != 0)
326 return ret_val;
327 map4 = netlbl_domhsh_addr4_entry(iter4);
328 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
329 map4->def.type);
330 if (ret_val != 0)
331 return ret_val;
332 switch (map4->def.type) {
333 case NETLBL_NLTYPE_CIPSOV4:
334 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
335 map4->def.cipso->doi);
336 if (ret_val != 0)
337 return ret_val;
338 break;
339 }
340
341 nla_nest_end(skb, nla_b);
342 }
343#if IS_ENABLED(CONFIG_IPV6)
344 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) {
345 struct netlbl_domaddr6_map *map6;
346
347 nla_b = nla_nest_start_noflag(skb,
348 NLBL_MGMT_A_ADDRSELECTOR);
349 if (nla_b == NULL)
350 return -ENOMEM;
351
352 ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6ADDR,
353 &iter6->addr);
354 if (ret_val != 0)
355 return ret_val;
356 ret_val = nla_put_in6_addr(skb, NLBL_MGMT_A_IPV6MASK,
357 &iter6->mask);
358 if (ret_val != 0)
359 return ret_val;
360 map6 = netlbl_domhsh_addr6_entry(iter6);
361 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
362 map6->def.type);
363 if (ret_val != 0)
364 return ret_val;
365
366 switch (map6->def.type) {
367 case NETLBL_NLTYPE_CALIPSO:
368 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
369 map6->def.calipso->doi);
370 if (ret_val != 0)
371 return ret_val;
372 break;
373 }
374
375 nla_nest_end(skb, nla_b);
376 }
377#endif /* IPv6 */
378
379 nla_nest_end(skb, nla_a);
380 break;
381 case NETLBL_NLTYPE_UNLABELED:
382 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
383 entry->def.type);
384 break;
385 case NETLBL_NLTYPE_CIPSOV4:
386 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
387 entry->def.type);
388 if (ret_val != 0)
389 return ret_val;
390 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CV4DOI,
391 entry->def.cipso->doi);
392 break;
393 case NETLBL_NLTYPE_CALIPSO:
394 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL,
395 entry->def.type);
396 if (ret_val != 0)
397 return ret_val;
398 ret_val = nla_put_u32(skb, NLBL_MGMT_A_CLPDOI,
399 entry->def.calipso->doi);
400 break;
401 }
402
403 return ret_val;
404}
405
406/*
407 * NetLabel Command Handlers
408 */
409
410/**
411 * netlbl_mgmt_add - Handle an ADD message
412 * @skb: the NETLINK buffer
413 * @info: the Generic NETLINK info block
414 *
415 * Description:
416 * Process a user generated ADD message and add the domains from the message
417 * to the hash table. See netlabel.h for a description of the message format.
418 * Returns zero on success, negative values on failure.
419 *
420 */
421static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
422{
423 struct netlbl_audit audit_info;
424
425 if ((!info->attrs[NLBL_MGMT_A_DOMAIN]) ||
426 (!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
427 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
428 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
429 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
430 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
431 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
432 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
433 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
434 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
435 return -EINVAL;
436
437 netlbl_netlink_auditinfo(skb, &audit_info);
438
439 return netlbl_mgmt_add_common(info, &audit_info);
440}
441
442/**
443 * netlbl_mgmt_remove - Handle a REMOVE message
444 * @skb: the NETLINK buffer
445 * @info: the Generic NETLINK info block
446 *
447 * Description:
448 * Process a user generated REMOVE message and remove the specified domain
449 * mappings. Returns zero on success, negative values on failure.
450 *
451 */
452static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
453{
454 char *domain;
455 struct netlbl_audit audit_info;
456
457 if (!info->attrs[NLBL_MGMT_A_DOMAIN])
458 return -EINVAL;
459
460 netlbl_netlink_auditinfo(skb, &audit_info);
461
462 domain = nla_data(info->attrs[NLBL_MGMT_A_DOMAIN]);
463 return netlbl_domhsh_remove(domain, AF_UNSPEC, &audit_info);
464}
465
466/**
467 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
468 * @entry: the domain mapping hash table entry
469 * @arg: the netlbl_domhsh_walk_arg structure
470 *
471 * Description:
472 * This function is designed to be used as a callback to the
473 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
474 * message. Returns the size of the message on success, negative values on
475 * failure.
476 *
477 */
478static int netlbl_mgmt_listall_cb(struct netlbl_dom_map *entry, void *arg)
479{
480 int ret_val = -ENOMEM;
481 struct netlbl_domhsh_walk_arg *cb_arg = arg;
482 void *data;
483
484 data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
485 cb_arg->seq, &netlbl_mgmt_gnl_family,
486 NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
487 if (data == NULL)
488 goto listall_cb_failure;
489
490 ret_val = netlbl_mgmt_listentry(cb_arg->skb, entry);
491 if (ret_val != 0)
492 goto listall_cb_failure;
493
494 cb_arg->seq++;
495 genlmsg_end(cb_arg->skb, data);
496 return 0;
497
498listall_cb_failure:
499 genlmsg_cancel(cb_arg->skb, data);
500 return ret_val;
501}
502
503/**
504 * netlbl_mgmt_listall - Handle a LISTALL message
505 * @skb: the NETLINK buffer
506 * @cb: the NETLINK callback
507 *
508 * Description:
509 * Process a user generated LISTALL message and dumps the domain hash table in
510 * a form suitable for use in a kernel generated LISTALL message. Returns zero
511 * on success, negative values on failure.
512 *
513 */
514static int netlbl_mgmt_listall(struct sk_buff *skb,
515 struct netlink_callback *cb)
516{
517 struct netlbl_domhsh_walk_arg cb_arg;
518 u32 skip_bkt = cb->args[0];
519 u32 skip_chain = cb->args[1];
520
521 cb_arg.nl_cb = cb;
522 cb_arg.skb = skb;
523 cb_arg.seq = cb->nlh->nlmsg_seq;
524
525 netlbl_domhsh_walk(&skip_bkt,
526 &skip_chain,
527 netlbl_mgmt_listall_cb,
528 &cb_arg);
529
530 cb->args[0] = skip_bkt;
531 cb->args[1] = skip_chain;
532 return skb->len;
533}
534
535/**
536 * netlbl_mgmt_adddef - Handle an ADDDEF message
537 * @skb: the NETLINK buffer
538 * @info: the Generic NETLINK info block
539 *
540 * Description:
541 * Process a user generated ADDDEF message and respond accordingly. Returns
542 * zero on success, negative values on failure.
543 *
544 */
545static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
546{
547 struct netlbl_audit audit_info;
548
549 if ((!info->attrs[NLBL_MGMT_A_PROTOCOL]) ||
550 (info->attrs[NLBL_MGMT_A_IPV4ADDR] &&
551 info->attrs[NLBL_MGMT_A_IPV6ADDR]) ||
552 (info->attrs[NLBL_MGMT_A_IPV4MASK] &&
553 info->attrs[NLBL_MGMT_A_IPV6MASK]) ||
554 ((info->attrs[NLBL_MGMT_A_IPV4ADDR] != NULL) ^
555 (info->attrs[NLBL_MGMT_A_IPV4MASK] != NULL)) ||
556 ((info->attrs[NLBL_MGMT_A_IPV6ADDR] != NULL) ^
557 (info->attrs[NLBL_MGMT_A_IPV6MASK] != NULL)))
558 return -EINVAL;
559
560 netlbl_netlink_auditinfo(skb, &audit_info);
561
562 return netlbl_mgmt_add_common(info, &audit_info);
563}
564
565/**
566 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
567 * @skb: the NETLINK buffer
568 * @info: the Generic NETLINK info block
569 *
570 * Description:
571 * Process a user generated REMOVEDEF message and remove the default domain
572 * mapping. Returns zero on success, negative values on failure.
573 *
574 */
575static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
576{
577 struct netlbl_audit audit_info;
578
579 netlbl_netlink_auditinfo(skb, &audit_info);
580
581 return netlbl_domhsh_remove_default(AF_UNSPEC, &audit_info);
582}
583
584/**
585 * netlbl_mgmt_listdef - Handle a LISTDEF message
586 * @skb: the NETLINK buffer
587 * @info: the Generic NETLINK info block
588 *
589 * Description:
590 * Process a user generated LISTDEF message and dumps the default domain
591 * mapping in a form suitable for use in a kernel generated LISTDEF message.
592 * Returns zero on success, negative values on failure.
593 *
594 */
595static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
596{
597 int ret_val = -ENOMEM;
598 struct sk_buff *ans_skb = NULL;
599 void *data;
600 struct netlbl_dom_map *entry;
601 u16 family;
602
603 if (info->attrs[NLBL_MGMT_A_FAMILY])
604 family = nla_get_u16(info->attrs[NLBL_MGMT_A_FAMILY]);
605 else
606 family = AF_INET;
607
608 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
609 if (ans_skb == NULL)
610 return -ENOMEM;
611 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
612 0, NLBL_MGMT_C_LISTDEF);
613 if (data == NULL)
614 goto listdef_failure;
615
616 rcu_read_lock();
617 entry = netlbl_domhsh_getentry(NULL, family);
618 if (entry == NULL) {
619 ret_val = -ENOENT;
620 goto listdef_failure_lock;
621 }
622 ret_val = netlbl_mgmt_listentry(ans_skb, entry);
623 rcu_read_unlock();
624 if (ret_val != 0)
625 goto listdef_failure;
626
627 genlmsg_end(ans_skb, data);
628 return genlmsg_reply(ans_skb, info);
629
630listdef_failure_lock:
631 rcu_read_unlock();
632listdef_failure:
633 kfree_skb(ans_skb);
634 return ret_val;
635}
636
637/**
638 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
639 * @skb: the skb to write to
640 * @cb: the NETLINK callback
641 * @protocol: the NetLabel protocol to use in the message
642 *
643 * Description:
644 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
645 * answer a application's PROTOCOLS message. Returns the size of the message
646 * on success, negative values on failure.
647 *
648 */
649static int netlbl_mgmt_protocols_cb(struct sk_buff *skb,
650 struct netlink_callback *cb,
651 u32 protocol)
652{
653 int ret_val = -ENOMEM;
654 void *data;
655
656 data = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
657 &netlbl_mgmt_gnl_family, NLM_F_MULTI,
658 NLBL_MGMT_C_PROTOCOLS);
659 if (data == NULL)
660 goto protocols_cb_failure;
661
662 ret_val = nla_put_u32(skb, NLBL_MGMT_A_PROTOCOL, protocol);
663 if (ret_val != 0)
664 goto protocols_cb_failure;
665
666 genlmsg_end(skb, data);
667 return 0;
668
669protocols_cb_failure:
670 genlmsg_cancel(skb, data);
671 return ret_val;
672}
673
674/**
675 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
676 * @skb: the NETLINK buffer
677 * @cb: the NETLINK callback
678 *
679 * Description:
680 * Process a user generated PROTOCOLS message and respond accordingly.
681 *
682 */
683static int netlbl_mgmt_protocols(struct sk_buff *skb,
684 struct netlink_callback *cb)
685{
686 u32 protos_sent = cb->args[0];
687
688 if (protos_sent == 0) {
689 if (netlbl_mgmt_protocols_cb(skb,
690 cb,
691 NETLBL_NLTYPE_UNLABELED) < 0)
692 goto protocols_return;
693 protos_sent++;
694 }
695 if (protos_sent == 1) {
696 if (netlbl_mgmt_protocols_cb(skb,
697 cb,
698 NETLBL_NLTYPE_CIPSOV4) < 0)
699 goto protocols_return;
700 protos_sent++;
701 }
702#if IS_ENABLED(CONFIG_IPV6)
703 if (protos_sent == 2) {
704 if (netlbl_mgmt_protocols_cb(skb,
705 cb,
706 NETLBL_NLTYPE_CALIPSO) < 0)
707 goto protocols_return;
708 protos_sent++;
709 }
710#endif
711
712protocols_return:
713 cb->args[0] = protos_sent;
714 return skb->len;
715}
716
717/**
718 * netlbl_mgmt_version - Handle a VERSION message
719 * @skb: the NETLINK buffer
720 * @info: the Generic NETLINK info block
721 *
722 * Description:
723 * Process a user generated VERSION message and respond accordingly. Returns
724 * zero on success, negative values on failure.
725 *
726 */
727static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
728{
729 int ret_val = -ENOMEM;
730 struct sk_buff *ans_skb = NULL;
731 void *data;
732
733 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
734 if (ans_skb == NULL)
735 return -ENOMEM;
736 data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
737 0, NLBL_MGMT_C_VERSION);
738 if (data == NULL)
739 goto version_failure;
740
741 ret_val = nla_put_u32(ans_skb,
742 NLBL_MGMT_A_VERSION,
743 NETLBL_PROTO_VERSION);
744 if (ret_val != 0)
745 goto version_failure;
746
747 genlmsg_end(ans_skb, data);
748 return genlmsg_reply(ans_skb, info);
749
750version_failure:
751 kfree_skb(ans_skb);
752 return ret_val;
753}
754
755
756/*
757 * NetLabel Generic NETLINK Command Definitions
758 */
759
760static const struct genl_ops netlbl_mgmt_genl_ops[] = {
761 {
762 .cmd = NLBL_MGMT_C_ADD,
763 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
764 .flags = GENL_ADMIN_PERM,
765 .doit = netlbl_mgmt_add,
766 .dumpit = NULL,
767 },
768 {
769 .cmd = NLBL_MGMT_C_REMOVE,
770 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
771 .flags = GENL_ADMIN_PERM,
772 .doit = netlbl_mgmt_remove,
773 .dumpit = NULL,
774 },
775 {
776 .cmd = NLBL_MGMT_C_LISTALL,
777 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
778 .flags = 0,
779 .doit = NULL,
780 .dumpit = netlbl_mgmt_listall,
781 },
782 {
783 .cmd = NLBL_MGMT_C_ADDDEF,
784 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
785 .flags = GENL_ADMIN_PERM,
786 .doit = netlbl_mgmt_adddef,
787 .dumpit = NULL,
788 },
789 {
790 .cmd = NLBL_MGMT_C_REMOVEDEF,
791 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
792 .flags = GENL_ADMIN_PERM,
793 .doit = netlbl_mgmt_removedef,
794 .dumpit = NULL,
795 },
796 {
797 .cmd = NLBL_MGMT_C_LISTDEF,
798 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
799 .flags = 0,
800 .doit = netlbl_mgmt_listdef,
801 .dumpit = NULL,
802 },
803 {
804 .cmd = NLBL_MGMT_C_PROTOCOLS,
805 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
806 .flags = 0,
807 .doit = NULL,
808 .dumpit = netlbl_mgmt_protocols,
809 },
810 {
811 .cmd = NLBL_MGMT_C_VERSION,
812 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
813 .flags = 0,
814 .doit = netlbl_mgmt_version,
815 .dumpit = NULL,
816 },
817};
818
819static struct genl_family netlbl_mgmt_gnl_family __ro_after_init = {
820 .hdrsize = 0,
821 .name = NETLBL_NLTYPE_MGMT_NAME,
822 .version = NETLBL_PROTO_VERSION,
823 .maxattr = NLBL_MGMT_A_MAX,
824 .policy = netlbl_mgmt_genl_policy,
825 .module = THIS_MODULE,
826 .ops = netlbl_mgmt_genl_ops,
827 .n_ops = ARRAY_SIZE(netlbl_mgmt_genl_ops),
828};
829
830/*
831 * NetLabel Generic NETLINK Protocol Functions
832 */
833
834/**
835 * netlbl_mgmt_genl_init - Register the NetLabel management component
836 *
837 * Description:
838 * Register the NetLabel management component with the Generic NETLINK
839 * mechanism. Returns zero on success, negative values on failure.
840 *
841 */
842int __init netlbl_mgmt_genl_init(void)
843{
844 return genl_register_family(&netlbl_mgmt_gnl_family);
845}