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787 lines
21 KiB
787 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* NetLabel CIPSO/IPv4 Support |
|
* |
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* 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 <[email protected]> |
|
*/ |
|
|
|
/* |
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006 |
|
*/ |
|
|
|
#include <linux/types.h> |
|
#include <linux/socket.h> |
|
#include <linux/string.h> |
|
#include <linux/skbuff.h> |
|
#include <linux/audit.h> |
|
#include <linux/slab.h> |
|
#include <net/sock.h> |
|
#include <net/netlink.h> |
|
#include <net/genetlink.h> |
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#include <net/netlabel.h> |
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#include <net/cipso_ipv4.h> |
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#include <linux/atomic.h> |
|
|
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#include "netlabel_user.h" |
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#include "netlabel_cipso_v4.h" |
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#include "netlabel_mgmt.h" |
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#include "netlabel_domainhash.h" |
|
|
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/* Argument struct for cipso_v4_doi_walk() */ |
|
struct netlbl_cipsov4_doiwalk_arg { |
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struct netlink_callback *nl_cb; |
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struct sk_buff *skb; |
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u32 seq; |
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}; |
|
|
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/* Argument struct for netlbl_domhsh_walk() */ |
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struct netlbl_domhsh_walk_arg { |
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struct netlbl_audit *audit_info; |
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u32 doi; |
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}; |
|
|
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/* NetLabel Generic NETLINK CIPSOv4 family */ |
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static struct genl_family netlbl_cipsov4_gnl_family; |
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/* NetLabel Netlink attribute policy */ |
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static const struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = { |
|
[NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 }, |
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[NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 }, |
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[NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 }, |
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[NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED }, |
|
[NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 }, |
|
[NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 }, |
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[NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED }, |
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[NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED }, |
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[NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 }, |
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[NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 }, |
|
[NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED }, |
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[NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED }, |
|
}; |
|
|
|
/* |
|
* Helper Functions |
|
*/ |
|
|
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/** |
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* netlbl_cipsov4_add_common - Parse the common sections of a ADD message |
|
* @info: the Generic NETLINK info block |
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* @doi_def: the CIPSO V4 DOI definition |
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* |
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* Description: |
|
* Parse the common sections of a ADD message and fill in the related values |
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* in @doi_def. Returns zero on success, negative values on failure. |
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* |
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*/ |
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static int netlbl_cipsov4_add_common(struct genl_info *info, |
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struct cipso_v4_doi *doi_def) |
|
{ |
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struct nlattr *nla; |
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int nla_rem; |
|
u32 iter = 0; |
|
|
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doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]); |
|
|
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if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_TAGLST], |
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NLBL_CIPSOV4_A_MAX, |
|
netlbl_cipsov4_genl_policy, |
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NULL) != 0) |
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return -EINVAL; |
|
|
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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); |
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} |
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while (iter < CIPSO_V4_TAG_MAXCNT) |
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doi_def->tags[iter++] = CIPSO_V4_TAG_INVALID; |
|
|
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return 0; |
|
} |
|
|
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/* |
|
* NetLabel Command Handlers |
|
*/ |
|
|
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/** |
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* netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition |
|
* @info: the Generic NETLINK info block |
|
* @audit_info: NetLabel audit information |
|
* |
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* Description: |
|
* Create a new CIPSO_V4_MAP_TRANS 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. |
|
* |
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*/ |
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static int netlbl_cipsov4_add_std(struct genl_info *info, |
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struct netlbl_audit *audit_info) |
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{ |
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int ret_val = -EINVAL; |
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struct cipso_v4_doi *doi_def = NULL; |
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struct nlattr *nla_a; |
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struct nlattr *nla_b; |
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int nla_a_rem; |
|
int nla_b_rem; |
|
u32 iter; |
|
|
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if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] || |
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!info->attrs[NLBL_CIPSOV4_A_MLSLVLLST]) |
|
return -EINVAL; |
|
|
|
if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST], |
|
NLBL_CIPSOV4_A_MAX, |
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netlbl_cipsov4_genl_policy, |
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NULL) != 0) |
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return -EINVAL; |
|
|
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doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL); |
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if (doi_def == NULL) |
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return -ENOMEM; |
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doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL); |
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if (doi_def->map.std == NULL) { |
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kfree(doi_def); |
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return -ENOMEM; |
|
} |
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doi_def->type = CIPSO_V4_MAP_TRANS; |
|
|
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ret_val = netlbl_cipsov4_add_common(info, doi_def); |
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if (ret_val != 0) |
|
goto add_std_failure; |
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ret_val = -EINVAL; |
|
|
|
nla_for_each_nested(nla_a, |
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info->attrs[NLBL_CIPSOV4_A_MLSLVLLST], |
|
nla_a_rem) |
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if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) { |
|
if (nla_validate_nested_deprecated(nla_a, |
|
NLBL_CIPSOV4_A_MAX, |
|
netlbl_cipsov4_genl_policy, |
|
NULL) != 0) |
|
goto add_std_failure; |
|
nla_for_each_nested(nla_b, nla_a, nla_b_rem) |
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switch (nla_type(nla_b)) { |
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case NLBL_CIPSOV4_A_MLSLVLLOC: |
|
if (nla_get_u32(nla_b) > |
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CIPSO_V4_MAX_LOC_LVLS) |
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goto add_std_failure; |
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if (nla_get_u32(nla_b) >= |
|
doi_def->map.std->lvl.local_size) |
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doi_def->map.std->lvl.local_size = |
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nla_get_u32(nla_b) + 1; |
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break; |
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case NLBL_CIPSOV4_A_MLSLVLREM: |
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if (nla_get_u32(nla_b) > |
|
CIPSO_V4_MAX_REM_LVLS) |
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goto add_std_failure; |
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if (nla_get_u32(nla_b) >= |
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doi_def->map.std->lvl.cipso_size) |
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doi_def->map.std->lvl.cipso_size = |
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nla_get_u32(nla_b) + 1; |
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break; |
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} |
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} |
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doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size, |
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sizeof(u32), |
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GFP_KERNEL | __GFP_NOWARN); |
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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, |
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sizeof(u32), |
|
GFP_KERNEL | __GFP_NOWARN); |
|
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; |
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nla_for_each_nested(nla_a, |
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info->attrs[NLBL_CIPSOV4_A_MLSLVLLST], |
|
nla_a_rem) |
|
if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSLVL) { |
|
struct nlattr *lvl_loc; |
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struct nlattr *lvl_rem; |
|
|
|
lvl_loc = nla_find_nested(nla_a, |
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NLBL_CIPSOV4_A_MLSLVLLOC); |
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lvl_rem = nla_find_nested(nla_a, |
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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); |
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} |
|
|
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if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) { |
|
if (nla_validate_nested_deprecated(info->attrs[NLBL_CIPSOV4_A_MLSCATLST], |
|
NLBL_CIPSOV4_A_MAX, |
|
netlbl_cipsov4_genl_policy, |
|
NULL) != 0) |
|
goto add_std_failure; |
|
|
|
nla_for_each_nested(nla_a, |
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info->attrs[NLBL_CIPSOV4_A_MLSCATLST], |
|
nla_a_rem) |
|
if (nla_type(nla_a) == NLBL_CIPSOV4_A_MLSCAT) { |
|
if (nla_validate_nested_deprecated(nla_a, |
|
NLBL_CIPSOV4_A_MAX, |
|
netlbl_cipsov4_genl_policy, |
|
NULL) != 0) |
|
goto add_std_failure; |
|
nla_for_each_nested(nla_b, nla_a, nla_b_rem) |
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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 | __GFP_NOWARN); |
|
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 | __GFP_NOWARN); |
|
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, audit_info); |
|
if (ret_val != 0) |
|
goto add_std_failure; |
|
return 0; |
|
|
|
add_std_failure: |
|
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 |
|
* @audit_info: NetLabel audit information |
|
* |
|
* 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, |
|
struct netlbl_audit *audit_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, audit_info); |
|
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_local - Adds a CIPSO V4 DOI definition |
|
* @info: the Generic NETLINK info block |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Create a new CIPSO_V4_MAP_LOCAL 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_local(struct genl_info *info, |
|
struct netlbl_audit *audit_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_LOCAL; |
|
|
|
ret_val = netlbl_cipsov4_add_common(info, doi_def); |
|
if (ret_val != 0) |
|
goto add_local_failure; |
|
|
|
ret_val = cipso_v4_doi_add(doi_def, audit_info); |
|
if (ret_val != 0) |
|
goto add_local_failure; |
|
return 0; |
|
|
|
add_local_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; |
|
struct netlbl_audit audit_info; |
|
|
|
if (!info->attrs[NLBL_CIPSOV4_A_DOI] || |
|
!info->attrs[NLBL_CIPSOV4_A_MTYPE]) |
|
return -EINVAL; |
|
|
|
netlbl_netlink_auditinfo(&audit_info); |
|
switch (nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE])) { |
|
case CIPSO_V4_MAP_TRANS: |
|
ret_val = netlbl_cipsov4_add_std(info, &audit_info); |
|
break; |
|
case CIPSO_V4_MAP_PASS: |
|
ret_val = netlbl_cipsov4_add_pass(info, &audit_info); |
|
break; |
|
case CIPSO_V4_MAP_LOCAL: |
|
ret_val = netlbl_cipsov4_add_local(info, &audit_info); |
|
break; |
|
} |
|
if (ret_val == 0) |
|
atomic_inc(&netlabel_mgmt_protocount); |
|
|
|
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_noflag(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_TRANS: |
|
nla_a = nla_nest_start_noflag(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_noflag(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_noflag(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_noflag(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; |
|
} |
|
cipso_v4_doi_putdef(doi_def); |
|
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) { |
|
cipso_v4_doi_putdef(doi_def); |
|
rcu_read_unlock(); |
|
kfree_skb(ans_skb); |
|
nlsze_mult *= 2; |
|
goto list_start; |
|
} |
|
list_failure_lock: |
|
cipso_v4_doi_putdef(doi_def); |
|
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).portid, |
|
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; |
|
|
|
genlmsg_end(cb_arg->skb, data); |
|
return 0; |
|
|
|
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->def.type == NETLBL_NLTYPE_CIPSOV4 && |
|
entry->def.cipso->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; |
|
struct netlbl_domhsh_walk_arg cb_arg; |
|
struct netlbl_audit audit_info; |
|
u32 skip_bkt = 0; |
|
u32 skip_chain = 0; |
|
|
|
if (!info->attrs[NLBL_CIPSOV4_A_DOI]) |
|
return -EINVAL; |
|
|
|
netlbl_netlink_auditinfo(&audit_info); |
|
cb_arg.doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_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(cb_arg.doi, &audit_info); |
|
if (ret_val == 0) |
|
atomic_dec(&netlabel_mgmt_protocount); |
|
} |
|
|
|
return ret_val; |
|
} |
|
|
|
/* |
|
* NetLabel Generic NETLINK Command Definitions |
|
*/ |
|
|
|
static const struct genl_small_ops netlbl_cipsov4_ops[] = { |
|
{ |
|
.cmd = NLBL_CIPSOV4_C_ADD, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.flags = GENL_ADMIN_PERM, |
|
.doit = netlbl_cipsov4_add, |
|
.dumpit = NULL, |
|
}, |
|
{ |
|
.cmd = NLBL_CIPSOV4_C_REMOVE, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.flags = GENL_ADMIN_PERM, |
|
.doit = netlbl_cipsov4_remove, |
|
.dumpit = NULL, |
|
}, |
|
{ |
|
.cmd = NLBL_CIPSOV4_C_LIST, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.flags = 0, |
|
.doit = netlbl_cipsov4_list, |
|
.dumpit = NULL, |
|
}, |
|
{ |
|
.cmd = NLBL_CIPSOV4_C_LISTALL, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.flags = 0, |
|
.doit = NULL, |
|
.dumpit = netlbl_cipsov4_listall, |
|
}, |
|
}; |
|
|
|
static struct genl_family netlbl_cipsov4_gnl_family __ro_after_init = { |
|
.hdrsize = 0, |
|
.name = NETLBL_NLTYPE_CIPSOV4_NAME, |
|
.version = NETLBL_PROTO_VERSION, |
|
.maxattr = NLBL_CIPSOV4_A_MAX, |
|
.policy = netlbl_cipsov4_genl_policy, |
|
.module = THIS_MODULE, |
|
.small_ops = netlbl_cipsov4_ops, |
|
.n_small_ops = ARRAY_SIZE(netlbl_cipsov4_ops), |
|
}; |
|
|
|
/* |
|
* 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) |
|
{ |
|
return genl_register_family(&netlbl_cipsov4_gnl_family); |
|
}
|
|
|