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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /net/netlabel/netlabel_kapi.c
Initial import
Diffstat (limited to 'net/netlabel/netlabel_kapi.c')
-rw-r--r--net/netlabel/netlabel_kapi.c1211
1 files changed, 1211 insertions, 0 deletions
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
new file mode 100644
index 000000000..28cddc85b
--- /dev/null
+++ b/net/netlabel/netlabel_kapi.c
@@ -0,0 +1,1211 @@
+/*
+ * 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 <paul@paul-moore.com>
+ *
+ */
+
+/*
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#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 <asm/bug.h>
+#include <linux/atomic.h>
+
+#include "netlabel_domainhash.h"
+#include "netlabel_unlabeled.h"
+#include "netlabel_cipso_v4.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, audit_info);
+ } else if (addr != NULL && mask != NULL) {
+ switch (family) {
+ case AF_INET:
+ return netlbl_domhsh_remove_af4(domain, addr, mask,
+ audit_info);
+ 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;
+ }
+
+ 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;
+ 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;
+}
+
+/*
+ * 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 = catmap;
+ u32 idx;
+ u32 bit;
+ NETLBL_CATMAP_MAPTYPE 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;
+}
+
+/**
+ * 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;
+ NETLBL_CATMAP_MAPTYPE bitmask;
+ NETLBL_CATMAP_MAPTYPE 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 sucess, 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;
+
+ if (off < catmap->startbit) {
+ off = catmap->startbit;
+ *offset = off;
+ }
+ iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
+ if (iter == NULL) {
+ *offset = (u32)-1;
+ return 0;
+ }
+
+ if (off < iter->startbit) {
+ off = iter->startbit;
+ *offset = off;
+ } else
+ off -= iter->startbit;
+
+ idx = off / NETLBL_CATMAP_MAPSIZE;
+ *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
+
+ 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;
+}
+
+/**
+ * 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] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
+
+ return 0;
+}
+
+/*
+ * 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
+ *
+ * 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)
+{
+ int ret_val;
+ struct netlbl_dom_map *dom_entry;
+
+ rcu_read_lock();
+ dom_entry = netlbl_domhsh_getentry(secattr->domain);
+ 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);
+ break;
+ case NETLBL_NLTYPE_UNLABELED:
+ ret_val = 0;
+ break;
+ default:
+ ret_val = -ENOENT;
+ }
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case AF_INET6:
+ /* since we don't support any IPv6 labeling protocols right
+ * now we can optimize everything away until we do */
+ ret_val = 0;
+ 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)
+{
+ cipso_v4_sock_delattr(sk);
+}
+
+/**
+ * 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 = -ENOMSG;
+ break;
+#endif /* IPv6 */
+ default:
+ ret_val = -EPROTONOSUPPORT;
+ }
+
+ return ret_val;
+}
+
+/**
+ * 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;
+ 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);
+ break;
+ case NETLBL_NLTYPE_UNLABELED:
+ /* just delete the protocols we support for right now
+ * but we could remove other protocols if needed */
+ cipso_v4_sock_delattr(sk);
+ ret_val = 0;
+ break;
+ default:
+ ret_val = -ENOENT;
+ }
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case AF_INET6:
+ /* since we don't support any IPv6 labeling protocols right
+ * now we can optimize everything away until we do */
+ ret_val = 0;
+ 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;
+
+ rcu_read_lock();
+ switch (req->rsk_ops->family) {
+ case AF_INET:
+ entry = netlbl_domhsh_getentry_af4(secattr->domain,
+ inet_rsk(req)->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:
+ /* just delete the protocols we support for right now
+ * but we could remove other protocols if needed */
+ cipso_v4_req_delattr(req);
+ ret_val = 0;
+ break;
+ default:
+ ret_val = -ENOENT;
+ }
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case AF_INET6:
+ /* since we don't support any IPv6 labeling protocols right
+ * now we can optimize everything away until we do */
+ ret_val = 0;
+ 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)
+{
+ cipso_v4_req_delattr(req);
+}
+
+/**
+ * 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;
+ 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:
+ /* since we don't support any IPv6 labeling protocols right
+ * now we can optimize everything away until we do */
+ ret_val = 0;
+ 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:
+ break;
+#endif /* IPv6 */
+ }
+
+ return netlbl_unlabel_getattr(skb, family, secattr);
+}
+
+/**
+ * netlbl_skbuff_err - Handle a LSM error on a sk_buff
+ * @skb: the packet
+ * @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, int error, int gateway)
+{
+ if (cipso_v4_optptr(skb))
+ cipso_v4_error(skb, error, gateway);
+}
+
+/**
+ * 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();
+}
+
+/**
+ * netlbl_cache_add - Add an entry to a NetLabel protocol cache
+ * @skb: the packet
+ * @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,
+ const struct netlbl_lsm_secattr *secattr)
+{
+ unsigned char *ptr;
+
+ if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
+ return -ENOMSG;
+
+ ptr = cipso_v4_optptr(skb);
+ if (ptr)
+ return cipso_v4_cache_add(ptr, secattr);
+
+ 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);
+}
+
+/*
+ * 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"
+ "\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);