// SPDX-License-Identifier: GPL-2.0-or-later
/*
* NetLabel Kernel API
*
* This file defines the kernel API 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]>
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/audit.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <net/calipso.h>
#include <asm/bug.h>
#include <linux/atomic.h>
#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
#include "netlabel_cipso_v4.h"
#include "netlabel_calipso.h"
#include "netlabel_user.h"
#include "netlabel_mgmt.h"
#include "netlabel_addrlist.h"
/*
* Configuration Functions
*/
/**
* netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
* @domain: the domain mapping to remove
* @family: address family
* @addr: IP address
* @mask: IP address mask
* @audit_info: NetLabel audit information
*
* Description:
* Removes a NetLabel/LSM domain mapping. A @domain value of NULL causes the
* default domain mapping to be removed. Returns zero on success, negative
* values on failure.
*
*/
int netlbl_cfg_map_del(const char *domain,
u16 family,
const void *addr,
const void *mask,
struct netlbl_audit *audit_info)
{
if (addr == NULL && mask == NULL) {
return netlbl_domhsh_remove(domain, family, audit_info);
} else if (addr != NULL && mask != NULL) {
switch (family) {
case AF_INET:
return netlbl_domhsh_remove_af4(domain, addr, mask,
audit_info);
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
return netlbl_domhsh_remove_af6(domain, addr, mask,
audit_info);
#endif /* IPv6 */
default:
return -EPFNOSUPPORT;
}
} else
return -EINVAL;
}
/**
* netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
* @domain: the domain mapping to add
* @family: address family
* @addr: IP address
* @mask: IP address mask
* @audit_info: NetLabel audit information
*
* Description:
* Adds a new unlabeled NetLabel/LSM domain mapping. A @domain value of NULL
* causes a new default domain mapping to be added. Returns zero on success,
* negative values on failure.
*
*/
int netlbl_cfg_unlbl_map_add(const char *domain,
u16 family,
const void *addr,
const void *mask,
struct netlbl_audit *audit_info)
{
int ret_val = -ENOMEM;
struct netlbl_dom_map *entry;
struct netlbl_domaddr_map *addrmap = NULL;
struct netlbl_domaddr4_map *map4 = NULL;
struct netlbl_domaddr6_map *map6 = NULL;
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (entry == NULL)
return -ENOMEM;
if (domain != NULL) {
entry->domain = kstrdup(domain, GFP_ATOMIC);
if (entry->domain == NULL)
goto cfg_unlbl_map_add_failure;
}
entry->family = family;
if (addr == NULL && mask == NULL)
entry->def.type = NETLBL_NLTYPE_UNLABELED;
else if (addr != NULL && mask != NULL) {
addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
if (addrmap == NULL)
goto cfg_unlbl_map_add_failure;
INIT_LIST_HEAD(&addrmap->list4);
INIT_LIST_HEAD(&addrmap->list6);
switch (family) {
case AF_INET: {
const struct in_addr *addr4 = addr;
const struct in_addr *mask4 = mask;
map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
if (map4 == NULL)
goto cfg_unlbl_map_add_failure;
map4->def.type = NETLBL_NLTYPE_UNLABELED;
map4->list.addr = addr4->s_addr & mask4->s_addr;
map4->list.mask = mask4->s_addr;
map4->list.valid = 1;
ret_val = netlbl_af4list_add(&map4->list,
&addrmap->list4);
if (ret_val != 0)
goto cfg_unlbl_map_add_failure;
break;
}
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6: {
const struct in6_addr *addr6 = addr;
const struct in6_addr *mask6 = mask;
map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
if (map6 == NULL)
goto cfg_unlbl_map_add_failure;
map6->def.type = NETLBL_NLTYPE_UNLABELED;
map6->list.addr = *addr6;
map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
map6->list.mask = *mask6;
map6->list.valid = 1;
ret_val = netlbl_af6list_add(&map6->list,
&addrmap->list6);
if (ret_val != 0)
goto cfg_unlbl_map_add_failure;
break;
}
#endif /* IPv6 */
default:
goto cfg_unlbl_map_add_failure;
}
entry->def.addrsel = addrmap;
entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
} else {
ret_val = -EINVAL;
goto cfg_unlbl_map_add_failure;
}
ret_val = netlbl_domhsh_add(entry, audit_info);
if (ret_val != 0)
goto cfg_unlbl_map_add_failure;
return 0;
cfg_unlbl_map_add_failure:
kfree(entry->domain);
kfree(entry);
kfree(addrmap);
kfree(map4);
kfree(map6);
return ret_val;
}
/**
* netlbl_cfg_unlbl_static_add - Adds a new static label
* @net: network namespace
* @dev_name: interface name
* @addr: IP address in network byte order (struct in[6]_addr)
* @mask: address mask in network byte order (struct in[6]_addr)
* @family: address family
* @secid: LSM secid value for the entry
* @audit_info: NetLabel audit information
*
* Description:
* Adds a new NetLabel static label to be used when protocol provided labels
* are not present on incoming traffic. If @dev_name is NULL then the default
* interface will be used. Returns zero on success, negative values on failure.
*
*/
int netlbl_cfg_unlbl_static_add(struct net *net,
const char *dev_name,
const void *addr,
const void *mask,
u16 family,
u32 secid,
struct netlbl_audit *audit_info)
{
u32 addr_len;
switch (family) {
case AF_INET:
addr_len = sizeof(struct in_addr);
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
addr_len = sizeof(struct in6_addr);
break;
#endif /* IPv6 */
default:
return -EPFNOSUPPORT;
}
return netlbl_unlhsh_add(net,
dev_name, addr, mask, addr_len,
secid, audit_info);
}
/**
* netlbl_cfg_unlbl_static_del - Removes an existing static label
* @net: network namespace
* @dev_name: interface name
* @addr: IP address in network byte order (struct in[6]_addr)
* @mask: address mask in network byte order (struct in[6]_addr)
* @family: address family
* @audit_info: NetLabel audit information
*
* Description:
* Removes an existing NetLabel static label used when protocol provided labels
* are not present on incoming traffic. If @dev_name is NULL then the default
* interface will be used. Returns zero on success, negative values on failure.
*
*/
int netlbl_cfg_unlbl_static_del(struct net *net,
const char *dev_name,
const void *addr,
const void *mask,
u16 family,
struct netlbl_audit *audit_info)
{
u32 addr_len;
switch (family) {
case AF_INET:
addr_len = sizeof(struct in_addr);
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
addr_len = sizeof(struct in6_addr);
break;
#endif /* IPv6 */
default:
return -EPFNOSUPPORT;
}
return netlbl_unlhsh_remove(net,
dev_name, addr, mask, addr_len,
audit_info);
}
/**
* netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
* @doi_def: CIPSO DOI definition
* @audit_info: NetLabel audit information
*
* Description:
* Add a new CIPSO DOI definition as defined by @doi_def. Returns zero on
* success and negative values on failure.
*
*/
int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
struct netlbl_audit *audit_info)
{
return cipso_v4_doi_add(doi_def, audit_info);
}
/**
* netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
* @doi: CIPSO DOI
* @audit_info: NetLabel audit information
*
* Description:
* Remove an existing CIPSO DOI definition matching @doi. Returns zero on
* success and negative values on failure.
*
*/
void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
{
cipso_v4_doi_remove(doi, audit_info);
}
/**
* netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
* @doi: the CIPSO DOI
* @domain: the domain mapping to add
* @addr: IP address
* @mask: IP address mask
* @audit_info: NetLabel audit information
*
* Description:
* Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
* subsystem. A @domain value of NULL adds a new default domain mapping.
* Returns zero on success, negative values on failure.
*
*/
int netlbl_cfg_cipsov4_map_add(u32 doi,
const char *domain,
const struct in_addr *addr,
const struct in_addr *mask,
struct netlbl_audit *audit_info)
{
int ret_val = -ENOMEM;
struct cipso_v4_doi *doi_def;
struct netlbl_dom_map *entry;
struct netlbl_domaddr_map *addrmap = NULL;
struct netlbl_domaddr4_map *addrinfo = NULL;
doi_def = cipso_v4_doi_getdef(doi);
if (doi_def == NULL)
return -ENOENT;
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (entry == NULL)
goto out_entry;
entry->family = AF_INET;
if (domain != NULL) {
entry->domain = kstrdup(domain, GFP_ATOMIC);
if (entry->domain == NULL)
goto out_domain;
}
if (addr == NULL && mask == NULL) {
entry->def.cipso = doi_def;
entry->def.type = NETLBL_NLTYPE_CIPSOV4;
} else if (addr != NULL && mask != NULL) {
addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
if (addrmap == NULL)
goto out_addrmap;
INIT_LIST_HEAD(&addrmap->list4);
INIT_LIST_HEAD(&addrmap->list6);
addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
if (addrinfo == NULL)
goto out_addrinfo;
addrinfo->def.cipso = doi_def;
addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
addrinfo->list.addr = addr->s_addr & mask->s_addr;
addrinfo->list.mask = mask->s_addr;
addrinfo->list.valid = 1;
ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
if (ret_val != 0)
goto cfg_cipsov4_map_add_failure;
entry->def.addrsel = addrmap;
entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
} else {
ret_val = -EINVAL;
goto out_addrmap;
}
ret_val = netlbl_domhsh_add(entry, audit_info);
if (ret_val != 0)
goto cfg_cipsov4_map_add_failure;
return 0;
cfg_cipsov4_map_add_failure:
kfree(addrinfo);
out_addrinfo:
kfree(addrmap);
out_addrmap:
kfree(entry->domain);
out_domain:
kfree(entry);
out_entry:
cipso_v4_doi_putdef(doi_def);
return ret_val;
}
/**
* netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
* @doi_def: CALIPSO DOI definition
* @audit_info: NetLabel audit information
*
* Description:
* Add a new CALIPSO DOI definition as defined by @doi_def. Returns zero on
* success and negative values on failure.
*
*/
int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
struct netlbl_audit *audit_info)
{
#if IS_ENABLED(CONFIG_IPV6)
return calipso_doi_add(doi_def, audit_info);
#else /* IPv6 */
return -ENOSYS;
#endif /* IPv6 */
}
/**
* netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
* @doi: CALIPSO DOI
* @audit_info: NetLabel audit information
*
* Description:
* Remove an existing CALIPSO DOI definition matching @doi. Returns zero on
* success and negative values on failure.
*
*/
void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
{
#if IS_ENABLED(CONFIG_IPV6)
calipso_doi_remove(doi, audit_info);
#endif /* IPv6 */
}
/**
* netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
* @doi: the CALIPSO DOI
* @domain: the domain mapping to add
* @addr: IP address
* @mask: IP address mask
* @audit_info: NetLabel audit information
*
* Description:
* Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
* NetLabel subsystem. A @domain value of NULL adds a new default domain
* mapping. Returns zero on success, negative values on failure.
*
*/
int netlbl_cfg_calipso_map_add(u32 doi,
const char *domain,
const struct in6_addr *addr,
const struct in6_addr *mask,
struct netlbl_audit *audit_info)
{
#if IS_ENABLED(CONFIG_IPV6)
int ret_val = -ENOMEM;
struct calipso_doi *doi_def;
struct netlbl_dom_map *entry;
struct netlbl_domaddr_map *addrmap = NULL;
struct netlbl_domaddr6_map *addrinfo = NULL;
doi_def = calipso_doi_getdef(doi);
if (doi_def == NULL)
return -ENOENT;
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (entry == NULL)
goto out_entry;
entry->family = AF_INET6;
if (domain != NULL) {
entry->domain = kstrdup(domain, GFP_ATOMIC);
if (entry->domain == NULL)
goto out_domain;
}
if (addr == NULL && mask == NULL) {
entry->def.calipso = doi_def;
entry->def.type = NETLBL_NLTYPE_CALIPSO;
} else if (addr != NULL && mask != NULL) {
addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
if (addrmap == NULL)
goto out_addrmap;
INIT_LIST_HEAD(&addrmap->list4);
INIT_LIST_HEAD(&addrmap->list6);
addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
if (addrinfo == NULL)
goto out_addrinfo;
addrinfo->def.calipso = doi_def;
addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
addrinfo->list.addr = *addr;
addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
addrinfo->list.mask = *mask;
addrinfo->list.valid = 1;
ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
if (ret_val != 0)
goto cfg_calipso_map_add_failure;
entry->def.addrsel = addrmap;
entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
} else {
ret_val = -EINVAL;
goto out_addrmap;
}
ret_val = netlbl_domhsh_add(entry, audit_info);
if (ret_val != 0)
goto cfg_calipso_map_add_failure;
return 0;
cfg_calipso_map_add_failure:
kfree(addrinfo);
out_addrinfo:
kfree(addrmap);
out_addrmap:
kfree(entry->domain);
out_domain:
kfree(entry);
out_entry:
calipso_doi_putdef(doi_def);
return ret_val;
#else /* IPv6 */
return -ENOSYS;
#endif /* IPv6 */
}
/*
* Security Attribute Functions
*/
#define _CM_F_NONE 0x00000000
#define _CM_F_ALLOC 0x00000001
#define _CM_F_WALK 0x00000002
/**
* _netlbl_catmap_getnode - Get a individual node from a catmap
* @catmap: pointer to the category bitmap
* @offset: the requested offset
* @cm_flags: catmap flags, see _CM_F_*
* @gfp_flags: memory allocation flags
*
* Description:
* Iterate through the catmap looking for the node associated with @offset.
* If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
* one will be created and inserted into the catmap. If the _CM_F_WALK flag is
* set in @cm_flags and there is no associated node, the next highest node will
* be returned. Returns a pointer to the node on success, NULL on failure.
*
*/
static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
struct netlbl_lsm_catmap **catmap,
u32 offset,
unsigned int cm_flags,
gfp_t gfp_flags)
{
struct netlbl_lsm_catmap *iter = *catmap;
struct netlbl_lsm_catmap *prev = NULL;
if (iter == NULL)
goto catmap_getnode_alloc;
if (offset < iter->startbit)
goto catmap_getnode_walk;
while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
prev = iter;
iter = iter->next;
}
if (iter == NULL || offset < iter->startbit)
goto catmap_getnode_walk;
return iter;
catmap_getnode_walk:
if (cm_flags & _CM_F_WALK)
return iter;
catmap_getnode_alloc:
if (!(cm_flags & _CM_F_ALLOC))
return NULL;
iter = netlbl_catmap_alloc(gfp_flags);
if (iter == NULL)
return NULL;
iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
if (prev == NULL) {
iter->next = *catmap;
*catmap = iter;
} else {
iter->next = prev->next;
prev->next = iter;
}
return iter;
}
/**
* netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
* @catmap: the category bitmap
* @offset: the offset to start searching at, in bits
*
* Description:
* This function walks a LSM secattr category bitmap starting at @offset and
* returns the spot of the first set bit or -ENOENT if no bits are set.
*
*/
int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
{
struct netlbl_lsm_catmap *iter;
u32 idx;
u32 bit;
u64 bitmap;
iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
if (iter == NULL)
return -ENOENT;
if (offset > iter->startbit) {
offset -= iter->startbit;
idx = offset / NETLBL_CATMAP_MAPSIZE;
bit = offset % NETLBL_CATMAP_MAPSIZE;
} else {
idx = 0;
bit = 0;
}
bitmap = iter->bitmap[idx] >> bit;
for (;;) {
if (bitmap != 0) {
while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
bitmap >>= 1;
bit++;
}
return iter->startbit +
(NETLBL_CATMAP_MAPSIZE * idx) + bit;
}
if (++idx >= NETLBL_CATMAP_MAPCNT) {
if (iter->next != NULL) {
iter = iter->next;
idx = 0;
} else
return -ENOENT;
}
bitmap = iter->bitmap[idx];
bit = 0;
}
return -ENOENT;
}
EXPORT_SYMBOL(netlbl_catmap_walk);
/**
* netlbl_catmap_walkrng - Find the end of a string of set bits
* @catmap: the category bitmap
* @offset: the offset to start searching at, in bits
*
* Description:
* This function walks a LSM secattr category bitmap starting at @offset and
* returns the spot of the first cleared bit or -ENOENT if the offset is past
* the end of the bitmap.
*
*/
int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
{
struct netlbl_lsm_catmap *iter;
struct netlbl_lsm_catmap *prev = NULL;
u32 idx;
u32 bit;
u64 bitmask;
u64 bitmap;
iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
if (iter == NULL)
return -ENOENT;
if (offset > iter->startbit) {
offset -= iter->startbit;
idx = offset / NETLBL_CATMAP_MAPSIZE;
bit = offset % NETLBL_CATMAP_MAPSIZE;
} else {
idx = 0;
bit = 0;
}
bitmask = NETLBL_CATMAP_BIT << bit;
for (;;) {
bitmap = iter->bitmap[idx];
while (bitmask != 0 && (bitmap & bitmask) != 0) {
bitmask <<= 1;
bit++;
}
if (prev && idx == 0 && bit == 0)
return prev->startbit + NETLBL_CATMAP_SIZE - 1;
else if (bitmask != 0)
return iter->startbit +
(NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
else if (++idx >= NETLBL_CATMAP_MAPCNT) {
if (iter->next == NULL)
return iter->startbit + NETLBL_CATMAP_SIZE - 1;
prev = iter;
iter = iter->next;
idx = 0;
}
bitmask = NETLBL_CATMAP_BIT;
bit = 0;
}
return -ENOENT;
}
/**
* netlbl_catmap_getlong - Export an unsigned long bitmap
* @catmap: pointer to the category bitmap
* @offset: pointer to the requested offset
* @bitmap: the exported bitmap
*
* Description:
* Export a bitmap with an offset greater than or equal to @offset and return
* it in @bitmap. The @offset must be aligned to an unsigned long and will be
* updated on return if different from what was requested; if the catmap is
* empty at the requested offset and beyond, the @offset is set to (u32)-1.
* Returns zero on success, negative values on failure.
*
*/
int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
u32 *offset,
unsigned long *bitmap)
{
struct netlbl_lsm_catmap *iter;
u32 off = *offset;
u32 idx;
/* only allow aligned offsets */
if ((off & (BITS_PER_LONG - 1)) != 0)
return -EINVAL;
/* a null catmap is equivalent to an empty one */
if (!catmap) {
*offset = (u32)-1;
return 0;
}
if (off < catmap->startbit) {
off = catmap->startbit;
*offset = off;
}
iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
if (iter == NULL) {
*offset = (u32)-1;
return 0;
}
if (off < iter->startbit) {
*offset = iter->startbit;
off = 0;
} else
off -= iter->startbit;
idx = off / NETLBL_CATMAP_MAPSIZE;
*bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
return 0;
}
/**
* netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
* @catmap: pointer to the category bitmap
* @bit: the bit to set
* @flags: memory allocation flags
*
* Description:
* Set the bit specified by @bit in @catmap. Returns zero on success,
* negative values on failure.
*
*/
int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
u32 bit,
gfp_t flags)
{
struct netlbl_lsm_catmap *iter;
u32 idx;
iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
if (iter == NULL)
return -ENOMEM;
bit -= iter->startbit;
idx = bit / NETLBL_CATMAP_MAPSIZE;
iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
return 0;
}
EXPORT_SYMBOL(netlbl_catmap_setbit);
/**
* netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
* @catmap: pointer to the category bitmap
* @start: the starting bit
* @end: the last bit in the string
* @flags: memory allocation flags
*
* Description:
* Set a range of bits, starting at @start and ending with @end. Returns zero
* on success, negative values on failure.
*
*/
int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
u32 start,
u32 end,
gfp_t flags)
{
int rc = 0;
u32 spot = start;
while (rc == 0 && spot <= end) {
if (((spot & (BITS_PER_LONG - 1)) == 0) &&
((end - spot) > BITS_PER_LONG)) {
rc = netlbl_catmap_setlong(catmap,
spot,
(unsigned long)-1,
flags);
spot += BITS_PER_LONG;
} else
rc = netlbl_catmap_setbit(catmap, spot++, flags);
}
return rc;
}
/**
* netlbl_catmap_setlong - Import an unsigned long bitmap
* @catmap: pointer to the category bitmap
* @offset: offset to the start of the imported bitmap
* @bitmap: the bitmap to import
* @flags: memory allocation flags
*
* Description:
* Import the bitmap specified in @bitmap into @catmap, using the offset
* in @offset. The offset must be aligned to an unsigned long. Returns zero
* on success, negative values on failure.
*
*/
int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
u32 offset,
unsigned long bitmap,
gfp_t flags)
{
struct netlbl_lsm_catmap *iter;
u32 idx;
/* only allow aligned offsets */
if ((offset & (BITS_PER_LONG - 1)) != 0)
return -EINVAL;
iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
if (iter == NULL)
return -ENOMEM;
offset -= iter->startbit;
idx = offset / NETLBL_CATMAP_MAPSIZE;
iter->bitmap[idx] |= (u64)bitmap
<< (offset % NETLBL_CATMAP_MAPSIZE);
return 0;
}
/* Bitmap functions
*/
/**
* netlbl_bitmap_walk - Walk a bitmap looking for a bit
* @bitmap: the bitmap
* @bitmap_len: length in bits
* @offset: starting offset
* @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
*
* Description:
* Starting at @offset, walk the bitmap from left to right until either the
* desired bit is found or we reach the end. Return the bit offset, -1 if
* not found.
*/
int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
u32 offset, u8 state)
{
u32 bit_spot;
u32 byte_offset;
unsigned char bitmask;
unsigned char byte;
if (offset >= bitmap_len)
return -1;
byte_offset = offset / 8;
byte = bitmap[byte_offset];
bit_spot = offset;
bitmask = 0x80 >> (offset % 8);
while (bit_spot < bitmap_len) {
if ((state && (byte & bitmask) == bitmask) ||
(state == 0 && (byte & bitmask) == 0))
return bit_spot;
if (++bit_spot >= bitmap_len)
return -1;
bitmask >>= 1;
if (bitmask == 0) {
byte = bitmap[++byte_offset];
bitmask = 0x80;
}
}
return -1;
}
EXPORT_SYMBOL(netlbl_bitmap_walk);
/**
* netlbl_bitmap_setbit - Sets a single bit in a bitmap
* @bitmap: the bitmap
* @bit: the bit
* @state: if non-zero, set the bit (1) else clear the bit (0)
*
* Description:
* Set a single bit in the bitmask. Returns zero on success, negative values
* on error.
*/
void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
{
u32 byte_spot;
u8 bitmask;
/* gcc always rounds to zero when doing integer division */
byte_spot = bit / 8;
bitmask = 0x80 >> (bit % 8);
if (state)
bitmap[byte_spot] |= bitmask;
else
bitmap[byte_spot] &= ~bitmask;
}
EXPORT_SYMBOL(netlbl_bitmap_setbit);
/*
* LSM Functions
*/
/**
* netlbl_enabled - Determine if the NetLabel subsystem is enabled
*
* Description:
* The LSM can use this function to determine if it should use NetLabel
* security attributes in it's enforcement mechanism. Currently, NetLabel is
* considered to be enabled when it's configuration contains a valid setup for
* at least one labeled protocol (i.e. NetLabel can understand incoming
* labeled packets of at least one type); otherwise NetLabel is considered to
* be disabled.
*
*/
int netlbl_enabled(void)
{
/* At some point we probably want to expose this mechanism to the user
* as well so that admins can toggle NetLabel regardless of the
* configuration */
return (atomic_read(&netlabel_mgmt_protocount) > 0);
}
/**
* netlbl_sock_setattr - Label a socket using the correct protocol
* @sk: the socket to label
* @family: protocol family
* @secattr: the security attributes
* @sk_locked: true if caller holds the socket lock
*
* Description:
* Attach the correct label to the given socket using the security attributes
* specified in @secattr. This function requires exclusive access to @sk,
* which means it either needs to be in the process of being created or locked.
* Returns zero on success, -EDESTADDRREQ if the domain is configured to use
* network address selectors (can't blindly label the socket), and negative
* values on all other failures.
*
*/
int netlbl_sock_setattr(struct sock *sk,
u16 family,
const struct netlbl_lsm_secattr *secattr,
bool sk_locked)
{
int ret_val;
struct netlbl_dom_map *dom_entry;
rcu_read_lock();
dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
if (dom_entry == NULL) {
ret_val = -ENOENT;
goto socket_setattr_return;
}
switch (family) {
case AF_INET:
switch (dom_entry->def.type) {
case NETLBL_NLTYPE_ADDRSELECT:
ret_val = -EDESTADDRREQ;
break;
case NETLBL_NLTYPE_CIPSOV4:
ret_val = cipso_v4_sock_setattr(sk,
dom_entry->def.cipso,
secattr, sk_locked);
break;
case NETLBL_NLTYPE_UNLABELED:
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
switch (dom_entry->def.type) {
case NETLBL_NLTYPE_ADDRSELECT:
ret_val = -EDESTADDRREQ;
break;
case NETLBL_NLTYPE_CALIPSO:
ret_val = calipso_sock_setattr(sk,
dom_entry->def.calipso,
secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
break;
#endif /* IPv6 */
default:
ret_val = -EPROTONOSUPPORT;
}
socket_setattr_return:
rcu_read_unlock();
return ret_val;
}
/**
* netlbl_sock_delattr - Delete all the NetLabel labels on a socket
* @sk: the socket
*
* Description:
* Remove all the NetLabel labeling from @sk. The caller is responsible for
* ensuring that @sk is locked.
*
*/
void netlbl_sock_delattr(struct sock *sk)
{
switch (sk->sk_family) {
case AF_INET:
cipso_v4_sock_delattr(sk);
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
calipso_sock_delattr(sk);
break;
#endif /* IPv6 */
}
}
/**
* netlbl_sock_getattr - Determine the security attributes of a sock
* @sk: the sock
* @secattr: the security attributes
*
* Description:
* Examines the given sock to see if any NetLabel style labeling has been
* applied to the sock, if so it parses the socket label and returns the
* security attributes in @secattr. Returns zero on success, negative values
* on failure.
*
*/
int netlbl_sock_getattr(struct sock *sk,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
switch (sk->sk_family) {
case AF_INET:
ret_val = cipso_v4_sock_getattr(sk, secattr);
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
ret_val = calipso_sock_getattr(sk, secattr);
break;
#endif /* IPv6 */
default:
ret_val = -EPROTONOSUPPORT;
}
return ret_val;
}
/**
* netlbl_sk_lock_check - Check if the socket lock has been acquired.
* @sk: the socket to be checked
*
* Return: true if socket @sk is locked or if lock debugging is disabled at
* runtime or compile-time; false otherwise
*
*/
#ifdef CONFIG_LOCKDEP
bool netlbl_sk_lock_check(struct sock *sk)
{
if (debug_locks)
return lockdep_sock_is_held(sk);
return true;
}
#else
bool netlbl_sk_lock_check(struct sock *sk)
{
return true;
}
#endif
/**
* netlbl_conn_setattr - Label a connected socket using the correct protocol
* @sk: the socket to label
* @addr: the destination address
* @secattr: the security attributes
*
* Description:
* Attach the correct label to the given connected socket using the security
* attributes specified in @secattr. The caller is responsible for ensuring
* that @sk is locked. Returns zero on success, negative values on failure.
*
*/
int netlbl_conn_setattr(struct sock *sk,
struct sockaddr *addr,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val;
struct sockaddr_in *addr4;
#if IS_ENABLED(CONFIG_IPV6)
struct sockaddr_in6 *addr6;
#endif
struct netlbl_dommap_def *entry;
rcu_read_lock();
switch (addr->sa_family) {
case AF_INET:
addr4 = (struct sockaddr_in *)addr;
entry = netlbl_domhsh_getentry_af4(secattr->domain,
addr4->sin_addr.s_addr);
if (entry == NULL) {
ret_val = -ENOENT;
goto conn_setattr_return;
}
switch (entry->type) {
case NETLBL_NLTYPE_CIPSOV4:
ret_val = cipso_v4_sock_setattr(sk,
entry->cipso, secattr,
netlbl_sk_lock_check(sk));
break;
case NETLBL_NLTYPE_UNLABELED:
/* just delete the protocols we support for right now
* but we could remove other protocols if needed */
netlbl_sock_delattr(sk);
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
addr6 = (struct sockaddr_in6 *)addr;
entry = netlbl_domhsh_getentry_af6(secattr->domain,
&addr6->sin6_addr);
if (entry == NULL) {
ret_val = -ENOENT;
goto conn_setattr_return;
}
switch (entry->type) {
case NETLBL_NLTYPE_CALIPSO:
ret_val = calipso_sock_setattr(sk,
entry->calipso, secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
/* just delete the protocols we support for right now
* but we could remove other protocols if needed */
netlbl_sock_delattr(sk);
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
break;
#endif /* IPv6 */
default:
ret_val = -EPROTONOSUPPORT;
}
conn_setattr_return:
rcu_read_unlock();
return ret_val;
}
/**
* netlbl_req_setattr - Label a request socket using the correct protocol
* @req: the request socket to label
* @secattr: the security attributes
*
* Description:
* Attach the correct label to the given socket using the security attributes
* specified in @secattr. Returns zero on success, negative values on failure.
*
*/
int netlbl_req_setattr(struct request_sock *req,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val;
struct netlbl_dommap_def *entry;
struct inet_request_sock *ireq = inet_rsk(req);
rcu_read_lock();
switch (req->rsk_ops->family) {
case AF_INET:
entry = netlbl_domhsh_getentry_af4(secattr->domain,
ireq->ir_rmt_addr);
if (entry == NULL) {
ret_val = -ENOENT;
goto req_setattr_return;
}
switch (entry->type) {
case NETLBL_NLTYPE_CIPSOV4:
ret_val = cipso_v4_req_setattr(req,
entry->cipso, secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
netlbl_req_delattr(req);
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
entry = netlbl_domhsh_getentry_af6(secattr->domain,
&ireq->ir_v6_rmt_addr);
if (entry == NULL) {
ret_val = -ENOENT;
goto req_setattr_return;
}
switch (entry->type) {
case NETLBL_NLTYPE_CALIPSO:
ret_val = calipso_req_setattr(req,
entry->calipso, secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
netlbl_req_delattr(req);
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
break;
#endif /* IPv6 */
default:
ret_val = -EPROTONOSUPPORT;
}
req_setattr_return:
rcu_read_unlock();
return ret_val;
}
/**
* netlbl_req_delattr - Delete all the NetLabel labels on a socket
* @req: the socket
*
* Description:
* Remove all the NetLabel labeling from @req.
*
*/
void netlbl_req_delattr(struct request_sock *req)
{
switch (req->rsk_ops->family) {
case AF_INET:
cipso_v4_req_delattr(req);
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
calipso_req_delattr(req);
break;
#endif /* IPv6 */
}
}
/**
* netlbl_skbuff_setattr - Label a packet using the correct protocol
* @skb: the packet
* @family: protocol family
* @secattr: the security attributes
*
* Description:
* Attach the correct label to the given packet using the security attributes
* specified in @secattr. Returns zero on success, negative values on failure.
*
*/
int netlbl_skbuff_setattr(struct sk_buff *skb,
u16 family,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val;
struct iphdr *hdr4;
#if IS_ENABLED(CONFIG_IPV6)
struct ipv6hdr *hdr6;
#endif
struct netlbl_dommap_def *entry;
rcu_read_lock();
switch (family) {
case AF_INET:
hdr4 = ip_hdr(skb);
entry = netlbl_domhsh_getentry_af4(secattr->domain,
hdr4->daddr);
if (entry == NULL) {
ret_val = -ENOENT;
goto skbuff_setattr_return;
}
switch (entry->type) {
case NETLBL_NLTYPE_CIPSOV4:
ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
/* just delete the protocols we support for right now
* but we could remove other protocols if needed */
ret_val = cipso_v4_skbuff_delattr(skb);
break;
default:
ret_val = -ENOENT;
}
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
hdr6 = ipv6_hdr(skb);
entry = netlbl_domhsh_getentry_af6(secattr->domain,
&hdr6->daddr);
if (entry == NULL) {
ret_val = -ENOENT;
goto skbuff_setattr_return;
}
switch (entry->type) {
case NETLBL_NLTYPE_CALIPSO:
ret_val = calipso_skbuff_setattr(skb, entry->calipso,
secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
/* just delete the protocols we support for right now
* but we could remove other protocols if needed */
ret_val = calipso_skbuff_delattr(skb);
break;
default:
ret_val = -ENOENT;
}
break;
#endif /* IPv6 */
default:
ret_val = -EPROTONOSUPPORT;
}
skbuff_setattr_return:
rcu_read_unlock();
return ret_val;
}
/**
* netlbl_skbuff_getattr - Determine the security attributes of a packet
* @skb: the packet
* @family: protocol family
* @secattr: the security attributes
*
* Description:
* Examines the given packet to see if a recognized form of packet labeling
* is present, if so it parses the packet label and returns the security
* attributes in @secattr. Returns zero on success, negative values on
* failure.
*
*/
int netlbl_skbuff_getattr(const struct sk_buff *skb,
u16 family,
struct netlbl_lsm_secattr *secattr)
{
unsigned char *ptr;
switch (family) {
case AF_INET:
ptr = cipso_v4_optptr(skb);
if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
return 0;
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
ptr = calipso_optptr(skb);
if (ptr && calipso_getattr(ptr, secattr) == 0)
return 0;
break;
#endif /* IPv6 */
}
return netlbl_unlabel_getattr(skb, family, secattr);
}
/**
* netlbl_skbuff_err - Handle a LSM error on a sk_buff
* @skb: the packet
* @family: the family
* @error: the error code
* @gateway: true if host is acting as a gateway, false otherwise
*
* Description:
* Deal with a LSM problem when handling the packet in @skb, typically this is
* a permission denied problem (-EACCES). The correct action is determined
* according to the packet's labeling protocol.
*
*/
void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
{
switch (family) {
case AF_INET:
if (cipso_v4_optptr(skb))
cipso_v4_error(skb, error, gateway);
break;
}
}
/**
* netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
*
* Description:
* For all of the NetLabel protocols that support some form of label mapping
* cache, invalidate the cache. Returns zero on success, negative values on
* error.
*
*/
void netlbl_cache_invalidate(void)
{
cipso_v4_cache_invalidate();
#if IS_ENABLED(CONFIG_IPV6)
calipso_cache_invalidate();
#endif /* IPv6 */
}
/**
* netlbl_cache_add - Add an entry to a NetLabel protocol cache
* @skb: the packet
* @family: the family
* @secattr: the packet's security attributes
*
* Description:
* Add the LSM security attributes for the given packet to the underlying
* NetLabel protocol's label mapping cache. Returns zero on success, negative
* values on error.
*
*/
int netlbl_cache_add(const struct sk_buff *skb, u16 family,
const struct netlbl_lsm_secattr *secattr)
{
unsigned char *ptr;
if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
return -ENOMSG;
switch (family) {
case AF_INET:
ptr = cipso_v4_optptr(skb);
if (ptr)
return cipso_v4_cache_add(ptr, secattr);
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
ptr = calipso_optptr(skb);
if (ptr)
return calipso_cache_add(ptr, secattr);
break;
#endif /* IPv6 */
}
return -ENOMSG;
}
/*
* Protocol Engine Functions
*/
/**
* netlbl_audit_start - Start an audit message
* @type: audit message type
* @audit_info: NetLabel audit information
*
* Description:
* Start an audit message using the type specified in @type and fill the audit
* message with some fields common to all NetLabel audit messages. This
* function should only be used by protocol engines, not LSMs. Returns a
* pointer to the audit buffer on success, NULL on failure.
*
*/
struct audit_buffer *netlbl_audit_start(int type,
struct netlbl_audit *audit_info)
{
return netlbl_audit_start_common(type, audit_info);
}
EXPORT_SYMBOL(netlbl_audit_start);
/*
* Setup Functions
*/
/**
* netlbl_init - Initialize NetLabel
*
* Description:
* Perform the required NetLabel initialization before first use.
*
*/
static int __init netlbl_init(void)
{
int ret_val;
printk(KERN_INFO "NetLabel: Initializing\n");
printk(KERN_INFO "NetLabel: domain hash size = %u\n",
(1 << NETLBL_DOMHSH_BITSIZE));
printk(KERN_INFO "NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO\n");
ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
if (ret_val != 0)
goto init_failure;
ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
if (ret_val != 0)
goto init_failure;
ret_val = netlbl_netlink_init();
if (ret_val != 0)
goto init_failure;
ret_val = netlbl_unlabel_defconf();
if (ret_val != 0)
goto init_failure;
printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
return 0;
init_failure:
panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
}
subsys_initcall(netlbl_init);
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