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(nla: info->attrs[NLBL_MGMT_A_PROTOCOL]);
92 if (info->attrs[NLBL_MGMT_A_DOMAIN]) {
93 size_t tmp_size = nla_len(nla: 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(dst: entry->domain,
100 nla: info->attrs[NLBL_MGMT_A_DOMAIN], dstsize: 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(nla: 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(nla: info->attrs[NLBL_MGMT_A_CV4DOI]);
119 cipsov4 = cipso_v4_doi_getdef(doi: 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(nla: info->attrs[NLBL_MGMT_A_CLPDOI]);
131 calipso = calipso_doi_getdef(doi: 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(list: &addrmap->list4);
157 INIT_LIST_HEAD(list: &addrmap->list6);
158
159 if (nla_len(nla: 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(nla: 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(nla: info->attrs[NLBL_MGMT_A_IPV4ADDR]);
170 mask = nla_data(nla: 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(entry: &map->list, head: &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(list: &addrmap->list4);
204 INIT_LIST_HEAD(list: &addrmap->list6);
205
206 if (nla_len(nla: 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(nla: 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(nla: info->attrs[NLBL_MGMT_A_IPV6ADDR]);
217 mask = nla_data(nla: 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(entry: &map->list, head: &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(objp: pmap);
254add_free_addrmap:
255 kfree(objp: addrmap);
256add_doi_put_def:
257 cipso_v4_doi_putdef(doi_def: cipsov4);
258#if IS_ENABLED(CONFIG_IPV6)
259 calipso_doi_putdef(doi_def: calipso);
260#endif
261add_free_domain:
262 kfree(objp: entry->domain);
263add_free_entry:
264 kfree(objp: 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 attrtype: NLBL_MGMT_A_DOMAIN, str: entry->domain);
293 if (ret_val != 0)
294 return ret_val;
295 }
296
297 ret_val = nla_put_u16(skb, attrtype: NLBL_MGMT_A_FAMILY, value: 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, attrtype: 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 attrtype: 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, attrtype: NLBL_MGMT_A_IPV4ADDR,
318 addr: 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, attrtype: NLBL_MGMT_A_IPV4MASK,
323 addr: 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, attrtype: NLBL_MGMT_A_PROTOCOL,
328 value: 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, attrtype: NLBL_MGMT_A_CV4DOI,
334 value: map4->def.cipso->doi);
335 if (ret_val != 0)
336 return ret_val;
337 break;
338 }
339
340 nla_nest_end(skb, start: 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 attrtype: NLBL_MGMT_A_ADDRSELECTOR);
348 if (nla_b == NULL)
349 return -ENOMEM;
350
351 ret_val = nla_put_in6_addr(skb, attrtype: NLBL_MGMT_A_IPV6ADDR,
352 addr: &iter6->addr);
353 if (ret_val != 0)
354 return ret_val;
355 ret_val = nla_put_in6_addr(skb, attrtype: NLBL_MGMT_A_IPV6MASK,
356 addr: &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, attrtype: NLBL_MGMT_A_PROTOCOL,
361 value: 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, attrtype: NLBL_MGMT_A_CLPDOI,
368 value: map6->def.calipso->doi);
369 if (ret_val != 0)
370 return ret_val;
371 break;
372 }
373
374 nla_nest_end(skb, start: nla_b);
375 }
376#endif /* IPv6 */
377
378 nla_nest_end(skb, start: nla_a);
379 break;
380 case NETLBL_NLTYPE_UNLABELED:
381 ret_val = nla_put_u32(skb, attrtype: NLBL_MGMT_A_PROTOCOL,
382 value: entry->def.type);
383 break;
384 case NETLBL_NLTYPE_CIPSOV4:
385 ret_val = nla_put_u32(skb, attrtype: NLBL_MGMT_A_PROTOCOL,
386 value: entry->def.type);
387 if (ret_val != 0)
388 return ret_val;
389 ret_val = nla_put_u32(skb, attrtype: NLBL_MGMT_A_CV4DOI,
390 value: entry->def.cipso->doi);
391 break;
392 case NETLBL_NLTYPE_CALIPSO:
393 ret_val = nla_put_u32(skb, attrtype: NLBL_MGMT_A_PROTOCOL,
394 value: entry->def.type);
395 if (ret_val != 0)
396 return ret_val;
397 ret_val = nla_put_u32(skb, attrtype: NLBL_MGMT_A_CLPDOI,
398 value: 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: &audit_info);
437
438 return netlbl_mgmt_add_common(info, audit_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: &audit_info);
460
461 domain = nla_data(nla: info->attrs[NLBL_MGMT_A_DOMAIN]);
462 return netlbl_domhsh_remove(domain, AF_UNSPEC, audit_info: &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(skb: cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
484 seq: cb_arg->seq, family: &netlbl_mgmt_gnl_family,
485 NLM_F_MULTI, cmd: NLBL_MGMT_C_LISTALL);
486 if (data == NULL)
487 goto listall_cb_failure;
488
489 ret_val = netlbl_mgmt_listentry(skb: cb_arg->skb, entry);
490 if (ret_val != 0)
491 goto listall_cb_failure;
492
493 cb_arg->seq++;
494 genlmsg_end(skb: cb_arg->skb, hdr: data);
495 return 0;
496
497listall_cb_failure:
498 genlmsg_cancel(skb: cb_arg->skb, hdr: 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: &skip_bkt,
525 skip_chain: &skip_chain,
526 callback: netlbl_mgmt_listall_cb,
527 cb_arg: &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: &audit_info);
560
561 return netlbl_mgmt_add_common(info, audit_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: &audit_info);
579
580 return netlbl_domhsh_remove_default(AF_UNSPEC, audit_info: &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(nla: 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(skb: ans_skb, info, family: &netlbl_mgmt_gnl_family,
608 flags: 0, cmd: 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(skb: ans_skb, entry);
619 rcu_read_unlock();
620 if (ret_val != 0)
621 goto listdef_failure;
622
623 genlmsg_end(skb: ans_skb, hdr: data);
624 return genlmsg_reply(skb: ans_skb, info);
625
626listdef_failure_lock:
627 rcu_read_unlock();
628listdef_failure:
629 kfree_skb(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, seq: cb->nlh->nlmsg_seq,
653 family: &netlbl_mgmt_gnl_family, NLM_F_MULTI,
654 cmd: NLBL_MGMT_C_PROTOCOLS);
655 if (data == NULL)
656 goto protocols_cb_failure;
657
658 ret_val = nla_put_u32(skb, attrtype: NLBL_MGMT_A_PROTOCOL, value: protocol);
659 if (ret_val != 0)
660 goto protocols_cb_failure;
661
662 genlmsg_end(skb, hdr: data);
663 return 0;
664
665protocols_cb_failure:
666 genlmsg_cancel(skb, hdr: 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(skb: ans_skb, info, family: &netlbl_mgmt_gnl_family,
733 flags: 0, cmd: NLBL_MGMT_C_VERSION);
734 if (data == NULL)
735 goto version_failure;
736
737 ret_val = nla_put_u32(skb: ans_skb,
738 attrtype: NLBL_MGMT_A_VERSION,
739 NETLBL_PROTO_VERSION);
740 if (ret_val != 0)
741 goto version_failure;
742
743 genlmsg_end(skb: ans_skb, hdr: data);
744 return genlmsg_reply(skb: ans_skb, info);
745
746version_failure:
747 kfree_skb(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(family: &netlbl_mgmt_gnl_family);
842}
843