2 * NetLabel Management Support
4 * This file defines the management functions for the NetLabel system. The
5 * NetLabel system manages static and dynamic label mappings for network
6 * protocols such as CIPSO and RIPSO.
8 * Author: Paul Moore <paul.moore@hp.com>
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
23 * the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #include <linux/types.h>
32 #include <linux/socket.h>
33 #include <linux/string.h>
34 #include <linux/skbuff.h>
36 #include <net/netlink.h>
37 #include <net/genetlink.h>
38 #include <net/netlabel.h>
39 #include <net/cipso_ipv4.h>
41 #include "netlabel_domainhash.h"
42 #include "netlabel_user.h"
43 #include "netlabel_mgmt.h"
45 /* Argument struct for netlbl_domhsh_walk() */
46 struct netlbl_domhsh_walk_arg
{
47 struct netlink_callback
*nl_cb
;
52 /* NetLabel Generic NETLINK CIPSOv4 family */
53 static struct genl_family netlbl_mgmt_gnl_family
= {
54 .id
= GENL_ID_GENERATE
,
56 .name
= NETLBL_NLTYPE_MGMT_NAME
,
57 .version
= NETLBL_PROTO_VERSION
,
58 .maxattr
= NLBL_MGMT_A_MAX
,
61 /* NetLabel Netlink attribute policy */
62 static struct nla_policy netlbl_mgmt_genl_policy
[NLBL_MGMT_A_MAX
+ 1] = {
63 [NLBL_MGMT_A_DOMAIN
] = { .type
= NLA_NUL_STRING
},
64 [NLBL_MGMT_A_PROTOCOL
] = { .type
= NLA_U32
},
65 [NLBL_MGMT_A_VERSION
] = { .type
= NLA_U32
},
66 [NLBL_MGMT_A_CV4DOI
] = { .type
= NLA_U32
},
70 * NetLabel Command Handlers
74 * netlbl_mgmt_add - Handle an ADD message
75 * @skb: the NETLINK buffer
76 * @info: the Generic NETLINK info block
79 * Process a user generated ADD message and add the domains from the message
80 * to the hash table. See netlabel.h for a description of the message format.
81 * Returns zero on success, negative values on failure.
84 static int netlbl_mgmt_add(struct sk_buff
*skb
, struct genl_info
*info
)
86 int ret_val
= -EINVAL
;
87 struct netlbl_dom_map
*entry
= NULL
;
91 if (!info
->attrs
[NLBL_MGMT_A_DOMAIN
] ||
92 !info
->attrs
[NLBL_MGMT_A_PROTOCOL
])
95 entry
= kzalloc(sizeof(*entry
), GFP_KERNEL
);
100 tmp_size
= nla_len(info
->attrs
[NLBL_MGMT_A_DOMAIN
]);
101 entry
->domain
= kmalloc(tmp_size
, GFP_KERNEL
);
102 if (entry
->domain
== NULL
) {
106 entry
->type
= nla_get_u32(info
->attrs
[NLBL_MGMT_A_PROTOCOL
]);
107 nla_strlcpy(entry
->domain
, info
->attrs
[NLBL_MGMT_A_DOMAIN
], tmp_size
);
109 switch (entry
->type
) {
110 case NETLBL_NLTYPE_UNLABELED
:
111 ret_val
= netlbl_domhsh_add(entry
, NETLINK_CB(skb
).sid
);
113 case NETLBL_NLTYPE_CIPSOV4
:
114 if (!info
->attrs
[NLBL_MGMT_A_CV4DOI
])
117 tmp_val
= nla_get_u32(info
->attrs
[NLBL_MGMT_A_CV4DOI
]);
118 /* We should be holding a rcu_read_lock() here while we hold
119 * the result but since the entry will always be deleted when
120 * the CIPSO DOI is deleted we aren't going to keep the
123 entry
->type_def
.cipsov4
= cipso_v4_doi_getdef(tmp_val
);
124 if (entry
->type_def
.cipsov4
== NULL
) {
128 ret_val
= netlbl_domhsh_add(entry
, NETLINK_CB(skb
).sid
);
141 kfree(entry
->domain
);
147 * netlbl_mgmt_remove - Handle a REMOVE message
148 * @skb: the NETLINK buffer
149 * @info: the Generic NETLINK info block
152 * Process a user generated REMOVE message and remove the specified domain
153 * mappings. Returns zero on success, negative values on failure.
156 static int netlbl_mgmt_remove(struct sk_buff
*skb
, struct genl_info
*info
)
160 if (!info
->attrs
[NLBL_MGMT_A_DOMAIN
])
163 domain
= nla_data(info
->attrs
[NLBL_MGMT_A_DOMAIN
]);
164 return netlbl_domhsh_remove(domain
, NETLINK_CB(skb
).sid
);
168 * netlbl_mgmt_listall_cb - netlbl_domhsh_walk() callback for LISTALL
169 * @entry: the domain mapping hash table entry
170 * @arg: the netlbl_domhsh_walk_arg structure
173 * This function is designed to be used as a callback to the
174 * netlbl_domhsh_walk() function for use in generating a response for a LISTALL
175 * message. Returns the size of the message on success, negative values on
179 static int netlbl_mgmt_listall_cb(struct netlbl_dom_map
*entry
, void *arg
)
181 int ret_val
= -ENOMEM
;
182 struct netlbl_domhsh_walk_arg
*cb_arg
= arg
;
185 data
= netlbl_netlink_hdr_put(cb_arg
->skb
,
186 NETLINK_CB(cb_arg
->nl_cb
->skb
).pid
,
188 netlbl_mgmt_gnl_family
.id
,
190 NLBL_MGMT_C_LISTALL
);
192 goto listall_cb_failure
;
194 ret_val
= nla_put_string(cb_arg
->skb
,
198 goto listall_cb_failure
;
199 ret_val
= nla_put_u32(cb_arg
->skb
, NLBL_MGMT_A_PROTOCOL
, entry
->type
);
201 goto listall_cb_failure
;
202 switch (entry
->type
) {
203 case NETLBL_NLTYPE_CIPSOV4
:
204 ret_val
= nla_put_u32(cb_arg
->skb
,
206 entry
->type_def
.cipsov4
->doi
);
208 goto listall_cb_failure
;
213 return genlmsg_end(cb_arg
->skb
, data
);
216 genlmsg_cancel(cb_arg
->skb
, data
);
221 * netlbl_mgmt_listall - Handle a LISTALL message
222 * @skb: the NETLINK buffer
223 * @cb: the NETLINK callback
226 * Process a user generated LISTALL message and dumps the domain hash table in
227 * a form suitable for use in a kernel generated LISTALL message. Returns zero
228 * on success, negative values on failure.
231 static int netlbl_mgmt_listall(struct sk_buff
*skb
,
232 struct netlink_callback
*cb
)
234 struct netlbl_domhsh_walk_arg cb_arg
;
235 u32 skip_bkt
= cb
->args
[0];
236 u32 skip_chain
= cb
->args
[1];
240 cb_arg
.seq
= cb
->nlh
->nlmsg_seq
;
242 netlbl_domhsh_walk(&skip_bkt
,
244 netlbl_mgmt_listall_cb
,
247 cb
->args
[0] = skip_bkt
;
248 cb
->args
[1] = skip_chain
;
253 * netlbl_mgmt_adddef - Handle an ADDDEF message
254 * @skb: the NETLINK buffer
255 * @info: the Generic NETLINK info block
258 * Process a user generated ADDDEF message and respond accordingly. Returns
259 * zero on success, negative values on failure.
262 static int netlbl_mgmt_adddef(struct sk_buff
*skb
, struct genl_info
*info
)
264 int ret_val
= -EINVAL
;
265 struct netlbl_dom_map
*entry
= NULL
;
268 if (!info
->attrs
[NLBL_MGMT_A_PROTOCOL
])
271 entry
= kzalloc(sizeof(*entry
), GFP_KERNEL
);
276 entry
->type
= nla_get_u32(info
->attrs
[NLBL_MGMT_A_PROTOCOL
]);
278 switch (entry
->type
) {
279 case NETLBL_NLTYPE_UNLABELED
:
280 ret_val
= netlbl_domhsh_add_default(entry
,
281 NETLINK_CB(skb
).sid
);
283 case NETLBL_NLTYPE_CIPSOV4
:
284 if (!info
->attrs
[NLBL_MGMT_A_CV4DOI
])
287 tmp_val
= nla_get_u32(info
->attrs
[NLBL_MGMT_A_CV4DOI
]);
288 /* We should be holding a rcu_read_lock() here while we hold
289 * the result but since the entry will always be deleted when
290 * the CIPSO DOI is deleted we aren't going to keep the
293 entry
->type_def
.cipsov4
= cipso_v4_doi_getdef(tmp_val
);
294 if (entry
->type_def
.cipsov4
== NULL
) {
298 ret_val
= netlbl_domhsh_add_default(entry
,
299 NETLINK_CB(skb
).sid
);
316 * netlbl_mgmt_removedef - Handle a REMOVEDEF message
317 * @skb: the NETLINK buffer
318 * @info: the Generic NETLINK info block
321 * Process a user generated REMOVEDEF message and remove the default domain
322 * mapping. Returns zero on success, negative values on failure.
325 static int netlbl_mgmt_removedef(struct sk_buff
*skb
, struct genl_info
*info
)
327 return netlbl_domhsh_remove_default(NETLINK_CB(skb
).sid
);
331 * netlbl_mgmt_listdef - Handle a LISTDEF message
332 * @skb: the NETLINK buffer
333 * @info: the Generic NETLINK info block
336 * Process a user generated LISTDEF message and dumps the default domain
337 * mapping in a form suitable for use in a kernel generated LISTDEF message.
338 * Returns zero on success, negative values on failure.
341 static int netlbl_mgmt_listdef(struct sk_buff
*skb
, struct genl_info
*info
)
343 int ret_val
= -ENOMEM
;
344 struct sk_buff
*ans_skb
= NULL
;
346 struct netlbl_dom_map
*entry
;
348 ans_skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
351 data
= netlbl_netlink_hdr_put(ans_skb
,
354 netlbl_mgmt_gnl_family
.id
,
356 NLBL_MGMT_C_LISTDEF
);
358 goto listdef_failure
;
361 entry
= netlbl_domhsh_getentry(NULL
);
364 goto listdef_failure_lock
;
366 ret_val
= nla_put_u32(ans_skb
, NLBL_MGMT_A_PROTOCOL
, entry
->type
);
368 goto listdef_failure_lock
;
369 switch (entry
->type
) {
370 case NETLBL_NLTYPE_CIPSOV4
:
371 ret_val
= nla_put_u32(ans_skb
,
373 entry
->type_def
.cipsov4
->doi
);
375 goto listdef_failure_lock
;
380 genlmsg_end(ans_skb
, data
);
382 ret_val
= genlmsg_unicast(ans_skb
, info
->snd_pid
);
384 goto listdef_failure
;
387 listdef_failure_lock
:
395 * netlbl_mgmt_protocols_cb - Write an individual PROTOCOL message response
396 * @skb: the skb to write to
397 * @seq: the NETLINK sequence number
398 * @cb: the NETLINK callback
399 * @protocol: the NetLabel protocol to use in the message
402 * This function is to be used in conjunction with netlbl_mgmt_protocols() to
403 * answer a application's PROTOCOLS message. Returns the size of the message
404 * on success, negative values on failure.
407 static int netlbl_mgmt_protocols_cb(struct sk_buff
*skb
,
408 struct netlink_callback
*cb
,
411 int ret_val
= -ENOMEM
;
414 data
= netlbl_netlink_hdr_put(skb
,
415 NETLINK_CB(cb
->skb
).pid
,
417 netlbl_mgmt_gnl_family
.id
,
419 NLBL_MGMT_C_PROTOCOLS
);
421 goto protocols_cb_failure
;
423 ret_val
= nla_put_u32(skb
, NLBL_MGMT_A_PROTOCOL
, protocol
);
425 goto protocols_cb_failure
;
427 return genlmsg_end(skb
, data
);
429 protocols_cb_failure
:
430 genlmsg_cancel(skb
, data
);
435 * netlbl_mgmt_protocols - Handle a PROTOCOLS message
436 * @skb: the NETLINK buffer
437 * @cb: the NETLINK callback
440 * Process a user generated PROTOCOLS message and respond accordingly.
443 static int netlbl_mgmt_protocols(struct sk_buff
*skb
,
444 struct netlink_callback
*cb
)
446 u32 protos_sent
= cb
->args
[0];
448 if (protos_sent
== 0) {
449 if (netlbl_mgmt_protocols_cb(skb
,
451 NETLBL_NLTYPE_UNLABELED
) < 0)
452 goto protocols_return
;
455 if (protos_sent
== 1) {
456 if (netlbl_mgmt_protocols_cb(skb
,
458 NETLBL_NLTYPE_CIPSOV4
) < 0)
459 goto protocols_return
;
464 cb
->args
[0] = protos_sent
;
469 * netlbl_mgmt_version - Handle a VERSION message
470 * @skb: the NETLINK buffer
471 * @info: the Generic NETLINK info block
474 * Process a user generated VERSION message and respond accordingly. Returns
475 * zero on success, negative values on failure.
478 static int netlbl_mgmt_version(struct sk_buff
*skb
, struct genl_info
*info
)
480 int ret_val
= -ENOMEM
;
481 struct sk_buff
*ans_skb
= NULL
;
484 ans_skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
487 data
= netlbl_netlink_hdr_put(ans_skb
,
490 netlbl_mgmt_gnl_family
.id
,
492 NLBL_MGMT_C_VERSION
);
494 goto version_failure
;
496 ret_val
= nla_put_u32(ans_skb
,
498 NETLBL_PROTO_VERSION
);
500 goto version_failure
;
502 genlmsg_end(ans_skb
, data
);
504 ret_val
= genlmsg_unicast(ans_skb
, info
->snd_pid
);
506 goto version_failure
;
516 * NetLabel Generic NETLINK Command Definitions
519 static struct genl_ops netlbl_mgmt_genl_c_add
= {
520 .cmd
= NLBL_MGMT_C_ADD
,
521 .flags
= GENL_ADMIN_PERM
,
522 .policy
= netlbl_mgmt_genl_policy
,
523 .doit
= netlbl_mgmt_add
,
527 static struct genl_ops netlbl_mgmt_genl_c_remove
= {
528 .cmd
= NLBL_MGMT_C_REMOVE
,
529 .flags
= GENL_ADMIN_PERM
,
530 .policy
= netlbl_mgmt_genl_policy
,
531 .doit
= netlbl_mgmt_remove
,
535 static struct genl_ops netlbl_mgmt_genl_c_listall
= {
536 .cmd
= NLBL_MGMT_C_LISTALL
,
538 .policy
= netlbl_mgmt_genl_policy
,
540 .dumpit
= netlbl_mgmt_listall
,
543 static struct genl_ops netlbl_mgmt_genl_c_adddef
= {
544 .cmd
= NLBL_MGMT_C_ADDDEF
,
545 .flags
= GENL_ADMIN_PERM
,
546 .policy
= netlbl_mgmt_genl_policy
,
547 .doit
= netlbl_mgmt_adddef
,
551 static struct genl_ops netlbl_mgmt_genl_c_removedef
= {
552 .cmd
= NLBL_MGMT_C_REMOVEDEF
,
553 .flags
= GENL_ADMIN_PERM
,
554 .policy
= netlbl_mgmt_genl_policy
,
555 .doit
= netlbl_mgmt_removedef
,
559 static struct genl_ops netlbl_mgmt_genl_c_listdef
= {
560 .cmd
= NLBL_MGMT_C_LISTDEF
,
562 .policy
= netlbl_mgmt_genl_policy
,
563 .doit
= netlbl_mgmt_listdef
,
567 static struct genl_ops netlbl_mgmt_genl_c_protocols
= {
568 .cmd
= NLBL_MGMT_C_PROTOCOLS
,
570 .policy
= netlbl_mgmt_genl_policy
,
572 .dumpit
= netlbl_mgmt_protocols
,
575 static struct genl_ops netlbl_mgmt_genl_c_version
= {
576 .cmd
= NLBL_MGMT_C_VERSION
,
578 .policy
= netlbl_mgmt_genl_policy
,
579 .doit
= netlbl_mgmt_version
,
584 * NetLabel Generic NETLINK Protocol Functions
588 * netlbl_mgmt_genl_init - Register the NetLabel management component
591 * Register the NetLabel management component with the Generic NETLINK
592 * mechanism. Returns zero on success, negative values on failure.
595 int netlbl_mgmt_genl_init(void)
599 ret_val
= genl_register_family(&netlbl_mgmt_gnl_family
);
603 ret_val
= genl_register_ops(&netlbl_mgmt_gnl_family
,
604 &netlbl_mgmt_genl_c_add
);
607 ret_val
= genl_register_ops(&netlbl_mgmt_gnl_family
,
608 &netlbl_mgmt_genl_c_remove
);
611 ret_val
= genl_register_ops(&netlbl_mgmt_gnl_family
,
612 &netlbl_mgmt_genl_c_listall
);
615 ret_val
= genl_register_ops(&netlbl_mgmt_gnl_family
,
616 &netlbl_mgmt_genl_c_adddef
);
619 ret_val
= genl_register_ops(&netlbl_mgmt_gnl_family
,
620 &netlbl_mgmt_genl_c_removedef
);
623 ret_val
= genl_register_ops(&netlbl_mgmt_gnl_family
,
624 &netlbl_mgmt_genl_c_listdef
);
627 ret_val
= genl_register_ops(&netlbl_mgmt_gnl_family
,
628 &netlbl_mgmt_genl_c_protocols
);
631 ret_val
= genl_register_ops(&netlbl_mgmt_gnl_family
,
632 &netlbl_mgmt_genl_c_version
);