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linux/net/netlabel/netlabel_cipso_v4.c
Paul Moore b1edeb1023 netlabel: Replace protocol/NetLabel linking with refrerence counts 
NetLabel has always had a list of backpointers in the CIPSO DOI definition
structure which pointed to the NetLabel LSM domain mapping structures which
referenced the CIPSO DOI struct.  The rationale for this was that when an
administrator removed a CIPSO DOI from the system all of the associated
NetLabel LSM domain mappings should be removed as well; a list of
backpointers made this a simple operation.

Unfortunately, while the backpointers did make the removal easier they were
a bit of a mess from an implementation point of view which was making
further development difficult.  Since the removal of a CIPSO DOI is a
realtively rare event it seems to make sense to remove this backpointer
list as the optimization was hurting us more then it was helping.  However,
we still need to be able to track when a CIPSO DOI definition is being used
so replace the backpointer list with a reference count.  In order to
preserve the current functionality of removing the associated LSM domain
mappings when a CIPSO DOI is removed we walk the LSM domain mapping table,
removing the relevant entries.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Reviewed-by: James Morris <jmorris@namei.org>
2008-10-10 10:16:31 -04:00

787 lines
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/*
* NetLabel CIPSO/IPv4 Support
*
* This file defines the CIPSO/IPv4 functions for the NetLabel system. The
* NetLabel system manages static and dynamic label mappings for network
* protocols such as CIPSO and RIPSO.
*
* Author: Paul Moore <paul.moore@hp.com>
*
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/audit.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <asm/atomic.h>
#include "netlabel_user.h"
#include "netlabel_cipso_v4.h"
#include "netlabel_mgmt.h"
#include "netlabel_domainhash.h"
/* Argument struct for cipso_v4_doi_walk() */
struct netlbl_cipsov4_doiwalk_arg {
struct netlink_callback *nl_cb;
struct sk_buff *skb;
u32 seq;
};
/* Argument struct for netlbl_domhsh_walk() */
struct netlbl_domhsh_walk_arg {
struct netlbl_audit *audit_info;
u32 doi;
};
/* NetLabel Generic NETLINK CIPSOv4 family */
static struct genl_family netlbl_cipsov4_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_CIPSOV4_NAME,
.version = NETLBL_PROTO_VERSION,
.maxattr = NLBL_CIPSOV4_A_MAX,
};
/* NetLabel Netlink attribute policy */
static const struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = {
[NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 },
[NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 },
[NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 },
[NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED },
[NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 },
[NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 },
[NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED },
[NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED },
[NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 },
[NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 },
[NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED },
[NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED },
};
/*
* Helper Functions
*/
/**
* netlbl_cipsov4_add_common - Parse the common sections of a ADD message
* @info: the Generic NETLINK info block
* @doi_def: the CIPSO V4 DOI definition
*
* Description:
* Parse the common sections of a ADD message and fill in the related values
* in @doi_def. Returns zero on success, negative values on failure.
*
*/
static int netlbl_cipsov4_add_common(struct genl_info *info,
struct cipso_v4_doi *doi_def)
{
struct nlattr *nla;
int nla_rem;
u32 iter = 0;
doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST],
NLBL_CIPSOV4_A_MAX,
netlbl_cipsov4_genl_policy) != 0)
return -EINVAL;
nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem)
if (nla_type(nla) == NLBL_CIPSOV4_A_TAG) {
if (iter >= CIPSO_V4_TAG_MAXCNT)
return -EINVAL;
doi_def->tags[iter++] = nla_get_u8(nla);
}
while (iter < CIPSO_V4_TAG_MAXCNT)
doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID;
return 0;
}
/*
* NetLabel Command Handlers
*/
/**
* netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
* @info: the Generic NETLINK info block
*
* Description:
* Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message
* and add it to the CIPSO V4 engine. Return zero on success and non-zero on
* error.
*
*/
static int netlbl_cipsov4_add_std(struct genl_info *info)
{
int ret_val = -EINVAL;
struct cipso_v4_doi *doi_def = NULL;
struct nlattr *nla_a;
struct nlattr *nla_b;
int nla_a_rem;
int nla_b_rem;
u32 iter;
if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] ||
!info->attrs[NLBL_CIPSOV4_A_MLSLVLLST])
return -EINVAL;
if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
NLBL_CIPSOV4_A_MAX,
netlbl_cipsov4_genl_policy) != 0)
return -EINVAL;
doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
if (doi_def == NULL)
return -ENOMEM;
doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
if (doi_def->map.std == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
doi_def->type = CIPSO_V4_MAP_STD;
ret_val = netlbl_cipsov4_add_common(info, doi_def);
if (ret_val != 0)
goto add_std_failure;
ret_val = -EINVAL;
nla_for_each_nested(nla_a,
info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
nla_a_rem)
if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
if (nla_validate_nested(nla_a,
NLBL_CIPSOV4_A_MAX,
netlbl_cipsov4_genl_policy) != 0)
goto add_std_failure;
nla_for_each_nested(nla_b, nla_a, nla_b_rem)
switch (nla_type(nla_b)) {
case NLBL_CIPSOV4_A_MLSLVLLOC:
if (nla_get_u32(nla_b) >
CIPSO_V4_MAX_LOC_LVLS)
goto add_std_failure;
if (nla_get_u32(nla_b) >=
doi_def->map.std->lvl.local_size)
doi_def->map.std->lvl.local_size =
nla_get_u32(nla_b) + 1;
break;
case NLBL_CIPSOV4_A_MLSLVLREM:
if (nla_get_u32(nla_b) >
CIPSO_V4_MAX_REM_LVLS)
goto add_std_failure;
if (nla_get_u32(nla_b) >=
doi_def->map.std->lvl.cipso_size)
doi_def->map.std->lvl.cipso_size =
nla_get_u32(nla_b) + 1;
break;
}
}
doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
sizeof(u32),
GFP_KERNEL);
if (doi_def->map.std->lvl.local == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
sizeof(u32),
GFP_KERNEL);
if (doi_def->map.std->lvl.cipso == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
nla_for_each_nested(nla_a,
info->attrs[NLBL_CIPSOV4_A_MLSLVLLST],
nla_a_rem)
if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) {
struct nlattr *lvl_loc;
struct nlattr *lvl_rem;
lvl_loc = nla_find_nested(nla_a,
NLBL_CIPSOV4_A_MLSLVLLOC);
lvl_rem = nla_find_nested(nla_a,
NLBL_CIPSOV4_A_MLSLVLREM);
if (lvl_loc == NULL || lvl_rem == NULL)
goto add_std_failure;
doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] =
nla_get_u32(lvl_rem);
doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] =
nla_get_u32(lvl_loc);
}
if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) {
if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
NLBL_CIPSOV4_A_MAX,
netlbl_cipsov4_genl_policy) != 0)
goto add_std_failure;
nla_for_each_nested(nla_a,
info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
nla_a_rem)
if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
if (nla_validate_nested(nla_a,
NLBL_CIPSOV4_A_MAX,
netlbl_cipsov4_genl_policy) != 0)
goto add_std_failure;
nla_for_each_nested(nla_b, nla_a, nla_b_rem)
switch (nla_type(nla_b)) {
case NLBL_CIPSOV4_A_MLSCATLOC:
if (nla_get_u32(nla_b) >
CIPSO_V4_MAX_LOC_CATS)
goto add_std_failure;
if (nla_get_u32(nla_b) >=
doi_def->map.std->cat.local_size)
doi_def->map.std->cat.local_size =
nla_get_u32(nla_b) + 1;
break;
case NLBL_CIPSOV4_A_MLSCATREM:
if (nla_get_u32(nla_b) >
CIPSO_V4_MAX_REM_CATS)
goto add_std_failure;
if (nla_get_u32(nla_b) >=
doi_def->map.std->cat.cipso_size)
doi_def->map.std->cat.cipso_size =
nla_get_u32(nla_b) + 1;
break;
}
}
doi_def->map.std->cat.local = kcalloc(
doi_def->map.std->cat.local_size,
sizeof(u32),
GFP_KERNEL);
if (doi_def->map.std->cat.local == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
doi_def->map.std->cat.cipso = kcalloc(
doi_def->map.std->cat.cipso_size,
sizeof(u32),
GFP_KERNEL);
if (doi_def->map.std->cat.cipso == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
nla_for_each_nested(nla_a,
info->attrs[NLBL_CIPSOV4_A_MLSCATLST],
nla_a_rem)
if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) {
struct nlattr *cat_loc;
struct nlattr *cat_rem;
cat_loc = nla_find_nested(nla_a,
NLBL_CIPSOV4_A_MLSCATLOC);
cat_rem = nla_find_nested(nla_a,
NLBL_CIPSOV4_A_MLSCATREM);
if (cat_loc == NULL || cat_rem == NULL)
goto add_std_failure;
doi_def->map.std->cat.local[
nla_get_u32(cat_loc)] =
nla_get_u32(cat_rem);
doi_def->map.std->cat.cipso[
nla_get_u32(cat_rem)] =
nla_get_u32(cat_loc);
}
}
ret_val = cipso_v4_doi_add(doi_def);
if (ret_val != 0)
goto add_std_failure;
return 0;
add_std_failure:
if (doi_def)
cipso_v4_doi_free(doi_def);
return ret_val;
}
/**
* netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
* @info: the Generic NETLINK info block
*
* Description:
* Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
* and add it to the CIPSO V4 engine. Return zero on success and non-zero on
* error.
*
*/
static int netlbl_cipsov4_add_pass(struct genl_info *info)
{
int ret_val;
struct cipso_v4_doi *doi_def = NULL;
if (!info->attrs[NLBL_CIPSOV4_A_TAGLST])
return -EINVAL;
doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
if (doi_def == NULL)
return -ENOMEM;
doi_def->type = CIPSO_V4_MAP_PASS;
ret_val = netlbl_cipsov4_add_common(info, doi_def);
if (ret_val != 0)
goto add_pass_failure;
ret_val = cipso_v4_doi_add(doi_def);
if (ret_val != 0)
goto add_pass_failure;
return 0;
add_pass_failure:
cipso_v4_doi_free(doi_def);
return ret_val;
}
/**
* netlbl_cipsov4_add - Handle an ADD message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Create a new DOI definition based on the given ADD message and add it to the
* CIPSO V4 engine. Returns zero on success, negative values on failure.
*
*/
static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
u32 type;
u32 doi;
const char *type_str = "(unknown)";
struct audit_buffer *audit_buf;
struct netlbl_audit audit_info;
if (!info->attrs[NLBL_CIPSOV4_A_DOI] ||
!info->attrs[NLBL_CIPSOV4_A_MTYPE])
return -EINVAL;
doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
netlbl_netlink_auditinfo(skb, &audit_info);
type = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE]);
switch (type) {
case CIPSO_V4_MAP_STD:
type_str = "std";
ret_val = netlbl_cipsov4_add_std(info);
break;
case CIPSO_V4_MAP_PASS:
type_str = "pass";
ret_val = netlbl_cipsov4_add_pass(info);
break;
}
if (ret_val == 0)
atomic_inc(&netlabel_mgmt_protocount);
audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
&audit_info);
if (audit_buf != NULL) {
audit_log_format(audit_buf,
" cipso_doi=%u cipso_type=%s res=%u",
doi,
type_str,
ret_val == 0 ? 1 : 0);
audit_log_end(audit_buf);
}
return ret_val;
}
/**
* netlbl_cipsov4_list - Handle a LIST message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated LIST message and respond accordingly. While the
* response message generated by the kernel is straightforward, determining
* before hand the size of the buffer to allocate is not (we have to generate
* the message to know the size). In order to keep this function sane what we
* do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in
* that size, if we fail then we restart with a larger buffer and try again.
* We continue in this manner until we hit a limit of failed attempts then we
* give up and just send an error message. Returns zero on success and
* negative values on error.
*
*/
static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
{
int ret_val;
struct sk_buff *ans_skb = NULL;
u32 nlsze_mult = 1;
void *data;
u32 doi;
struct nlattr *nla_a;
struct nlattr *nla_b;
struct cipso_v4_doi *doi_def;
u32 iter;
if (!info->attrs[NLBL_CIPSOV4_A_DOI]) {
ret_val = -EINVAL;
goto list_failure;
}
list_start:
ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL);
if (ans_skb == NULL) {
ret_val = -ENOMEM;
goto list_failure;
}
data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family,
0, NLBL_CIPSOV4_C_LIST);
if (data == NULL) {
ret_val = -ENOMEM;
goto list_failure;
}
doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
rcu_read_lock();
doi_def = cipso_v4_doi_getdef(doi);
if (doi_def == NULL) {
ret_val = -EINVAL;
goto list_failure_lock;
}
ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type);
if (ret_val != 0)
goto list_failure_lock;
nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST);
if (nla_a == NULL) {
ret_val = -ENOMEM;
goto list_failure_lock;
}
for (iter = 0;
iter < CIPSO_V4_TAG_MAXCNT &&
doi_def->tags[iter] != CIPSO_V4_TAG_INVALID;
iter++) {
ret_val = nla_put_u8(ans_skb,
NLBL_CIPSOV4_A_TAG,
doi_def->tags[iter]);
if (ret_val != 0)
goto list_failure_lock;
}
nla_nest_end(ans_skb, nla_a);
switch (doi_def->type) {
case CIPSO_V4_MAP_STD:
nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST);
if (nla_a == NULL) {
ret_val = -ENOMEM;
goto list_failure_lock;
}
for (iter = 0;
iter < doi_def->map.std->lvl.local_size;
iter++) {
if (doi_def->map.std->lvl.local[iter] ==
CIPSO_V4_INV_LVL)
continue;
nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL);
if (nla_b == NULL) {
ret_val = -ENOMEM;
goto list_retry;
}
ret_val = nla_put_u32(ans_skb,
NLBL_CIPSOV4_A_MLSLVLLOC,
iter);
if (ret_val != 0)
goto list_retry;
ret_val = nla_put_u32(ans_skb,
NLBL_CIPSOV4_A_MLSLVLREM,
doi_def->map.std->lvl.local[iter]);
if (ret_val != 0)
goto list_retry;
nla_nest_end(ans_skb, nla_b);
}
nla_nest_end(ans_skb, nla_a);
nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST);
if (nla_a == NULL) {
ret_val = -ENOMEM;
goto list_retry;
}
for (iter = 0;
iter < doi_def->map.std->cat.local_size;
iter++) {
if (doi_def->map.std->cat.local[iter] ==
CIPSO_V4_INV_CAT)
continue;
nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT);
if (nla_b == NULL) {
ret_val = -ENOMEM;
goto list_retry;
}
ret_val = nla_put_u32(ans_skb,
NLBL_CIPSOV4_A_MLSCATLOC,
iter);
if (ret_val != 0)
goto list_retry;
ret_val = nla_put_u32(ans_skb,
NLBL_CIPSOV4_A_MLSCATREM,
doi_def->map.std->cat.local[iter]);
if (ret_val != 0)
goto list_retry;
nla_nest_end(ans_skb, nla_b);
}
nla_nest_end(ans_skb, nla_a);
break;
}
rcu_read_unlock();
genlmsg_end(ans_skb, data);
return genlmsg_reply(ans_skb, info);
list_retry:
/* XXX - this limit is a guesstimate */
if (nlsze_mult < 4) {
rcu_read_unlock();
kfree_skb(ans_skb);
nlsze_mult *= 2;
goto list_start;
}
list_failure_lock:
rcu_read_unlock();
list_failure:
kfree_skb(ans_skb);
return ret_val;
}
/**
* netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL
* @doi_def: the CIPSOv4 DOI definition
* @arg: the netlbl_cipsov4_doiwalk_arg structure
*
* Description:
* This function is designed to be used as a callback to the
* cipso_v4_doi_walk() function for use in generating a response for a LISTALL
* message. Returns the size of the message on success, negative values on
* failure.
*
*/
static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg)
{
int ret_val = -ENOMEM;
struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg;
void *data;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
cb_arg->seq, &netlbl_cipsov4_gnl_family,
NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL);
if (data == NULL)
goto listall_cb_failure;
ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi);
if (ret_val != 0)
goto listall_cb_failure;
ret_val = nla_put_u32(cb_arg->skb,
NLBL_CIPSOV4_A_MTYPE,
doi_def->type);
if (ret_val != 0)
goto listall_cb_failure;
return genlmsg_end(cb_arg->skb, data);
listall_cb_failure:
genlmsg_cancel(cb_arg->skb, data);
return ret_val;
}
/**
* netlbl_cipsov4_listall - Handle a LISTALL message
* @skb: the NETLINK buffer
* @cb: the NETLINK callback
*
* Description:
* Process a user generated LISTALL message and respond accordingly. Returns
* zero on success and negative values on error.
*
*/
static int netlbl_cipsov4_listall(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct netlbl_cipsov4_doiwalk_arg cb_arg;
u32 doi_skip = cb->args[0];
cb_arg.nl_cb = cb;
cb_arg.skb = skb;
cb_arg.seq = cb->nlh->nlmsg_seq;
cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg);
cb->args[0] = doi_skip;
return skb->len;
}
/**
* netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
* @entry: LSM domain mapping entry
* @arg: the netlbl_domhsh_walk_arg structure
*
* Description:
* This function is intended for use by netlbl_cipsov4_remove() as the callback
* for the netlbl_domhsh_walk() function; it removes LSM domain map entries
* which are associated with the CIPSO DOI specified in @arg. Returns zero on
* success, negative values on failure.
*
*/
static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
{
struct netlbl_domhsh_walk_arg *cb_arg = arg;
if (entry->type == NETLBL_NLTYPE_CIPSOV4 &&
entry->type_def.cipsov4->doi == cb_arg->doi)
return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
return 0;
}
/**
* netlbl_cipsov4_remove - Handle a REMOVE message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated REMOVE message and respond accordingly. Returns
* zero on success, negative values on failure.
*
*/
static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
u32 doi = 0;
struct netlbl_domhsh_walk_arg cb_arg;
struct audit_buffer *audit_buf;
struct netlbl_audit audit_info;
u32 skip_bkt = 0;
u32 skip_chain = 0;
if (!info->attrs[NLBL_CIPSOV4_A_DOI])
return -EINVAL;
doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
netlbl_netlink_auditinfo(skb, &audit_info);
cb_arg.doi = doi;
cb_arg.audit_info = &audit_info;
ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
netlbl_cipsov4_remove_cb, &cb_arg);
if (ret_val == 0 || ret_val == -ENOENT) {
ret_val = cipso_v4_doi_remove(doi, &audit_info);
if (ret_val == 0)
atomic_dec(&netlabel_mgmt_protocount);
}
audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
&audit_info);
if (audit_buf != NULL) {
audit_log_format(audit_buf,
" cipso_doi=%u res=%u",
doi,
ret_val == 0 ? 1 : 0);
audit_log_end(audit_buf);
}
return ret_val;
}
/*
* NetLabel Generic NETLINK Command Definitions
*/
static struct genl_ops netlbl_cipsov4_ops[] = {
{
.cmd = NLBL_CIPSOV4_C_ADD,
.flags = GENL_ADMIN_PERM,
.policy = netlbl_cipsov4_genl_policy,
.doit = netlbl_cipsov4_add,
.dumpit = NULL,
},
{
.cmd = NLBL_CIPSOV4_C_REMOVE,
.flags = GENL_ADMIN_PERM,
.policy = netlbl_cipsov4_genl_policy,
.doit = netlbl_cipsov4_remove,
.dumpit = NULL,
},
{
.cmd = NLBL_CIPSOV4_C_LIST,
.flags = 0,
.policy = netlbl_cipsov4_genl_policy,
.doit = netlbl_cipsov4_list,
.dumpit = NULL,
},
{
.cmd = NLBL_CIPSOV4_C_LISTALL,
.flags = 0,
.policy = netlbl_cipsov4_genl_policy,
.doit = NULL,
.dumpit = netlbl_cipsov4_listall,
},
};
/*
* NetLabel Generic NETLINK Protocol Functions
*/
/**
* netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
*
* Description:
* Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
* mechanism. Returns zero on success, negative values on failure.
*
*/
int __init netlbl_cipsov4_genl_init(void)
{
int ret_val, i;
ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
if (ret_val != 0)
return ret_val;
for (i = 0; i < ARRAY_SIZE(netlbl_cipsov4_ops); i++) {
ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
&netlbl_cipsov4_ops[i]);
if (ret_val != 0)
return ret_val;
}
return 0;
}
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