Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * NetLabel Kernel API
0004  *
0005  * This file defines the kernel API for the NetLabel system.  The NetLabel
0006  * system manages static and dynamic label mappings for network protocols such
0007  * as CIPSO and RIPSO.
0008  *
0009  * Author: Paul Moore <paul@paul-moore.com>
0010  */
0011 
0012 /*
0013  * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
0014  */
0015 
0016 #include <linux/init.h>
0017 #include <linux/types.h>
0018 #include <linux/slab.h>
0019 #include <linux/audit.h>
0020 #include <linux/in.h>
0021 #include <linux/in6.h>
0022 #include <net/ip.h>
0023 #include <net/ipv6.h>
0024 #include <net/netlabel.h>
0025 #include <net/cipso_ipv4.h>
0026 #include <net/calipso.h>
0027 #include <asm/bug.h>
0028 #include <linux/atomic.h>
0029 
0030 #include "netlabel_domainhash.h"
0031 #include "netlabel_unlabeled.h"
0032 #include "netlabel_cipso_v4.h"
0033 #include "netlabel_calipso.h"
0034 #include "netlabel_user.h"
0035 #include "netlabel_mgmt.h"
0036 #include "netlabel_addrlist.h"
0037 
0038 /*
0039  * Configuration Functions
0040  */
0041 
0042 /**
0043  * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
0044  * @domain: the domain mapping to remove
0045  * @family: address family
0046  * @addr: IP address
0047  * @mask: IP address mask
0048  * @audit_info: NetLabel audit information
0049  *
0050  * Description:
0051  * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
0052  * default domain mapping to be removed.  Returns zero on success, negative
0053  * values on failure.
0054  *
0055  */
0056 int netlbl_cfg_map_del(const char *domain,
0057                u16 family,
0058                const void *addr,
0059                const void *mask,
0060                struct netlbl_audit *audit_info)
0061 {
0062     if (addr == NULL && mask == NULL) {
0063         return netlbl_domhsh_remove(domain, family, audit_info);
0064     } else if (addr != NULL && mask != NULL) {
0065         switch (family) {
0066         case AF_INET:
0067             return netlbl_domhsh_remove_af4(domain, addr, mask,
0068                             audit_info);
0069 #if IS_ENABLED(CONFIG_IPV6)
0070         case AF_INET6:
0071             return netlbl_domhsh_remove_af6(domain, addr, mask,
0072                             audit_info);
0073 #endif /* IPv6 */
0074         default:
0075             return -EPFNOSUPPORT;
0076         }
0077     } else
0078         return -EINVAL;
0079 }
0080 
0081 /**
0082  * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
0083  * @domain: the domain mapping to add
0084  * @family: address family
0085  * @addr: IP address
0086  * @mask: IP address mask
0087  * @audit_info: NetLabel audit information
0088  *
0089  * Description:
0090  * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
0091  * causes a new default domain mapping to be added.  Returns zero on success,
0092  * negative values on failure.
0093  *
0094  */
0095 int netlbl_cfg_unlbl_map_add(const char *domain,
0096                  u16 family,
0097                  const void *addr,
0098                  const void *mask,
0099                  struct netlbl_audit *audit_info)
0100 {
0101     int ret_val = -ENOMEM;
0102     struct netlbl_dom_map *entry;
0103     struct netlbl_domaddr_map *addrmap = NULL;
0104     struct netlbl_domaddr4_map *map4 = NULL;
0105     struct netlbl_domaddr6_map *map6 = NULL;
0106 
0107     entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
0108     if (entry == NULL)
0109         return -ENOMEM;
0110     if (domain != NULL) {
0111         entry->domain = kstrdup(domain, GFP_ATOMIC);
0112         if (entry->domain == NULL)
0113             goto cfg_unlbl_map_add_failure;
0114     }
0115     entry->family = family;
0116 
0117     if (addr == NULL && mask == NULL)
0118         entry->def.type = NETLBL_NLTYPE_UNLABELED;
0119     else if (addr != NULL && mask != NULL) {
0120         addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
0121         if (addrmap == NULL)
0122             goto cfg_unlbl_map_add_failure;
0123         INIT_LIST_HEAD(&addrmap->list4);
0124         INIT_LIST_HEAD(&addrmap->list6);
0125 
0126         switch (family) {
0127         case AF_INET: {
0128             const struct in_addr *addr4 = addr;
0129             const struct in_addr *mask4 = mask;
0130             map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
0131             if (map4 == NULL)
0132                 goto cfg_unlbl_map_add_failure;
0133             map4->def.type = NETLBL_NLTYPE_UNLABELED;
0134             map4->list.addr = addr4->s_addr & mask4->s_addr;
0135             map4->list.mask = mask4->s_addr;
0136             map4->list.valid = 1;
0137             ret_val = netlbl_af4list_add(&map4->list,
0138                              &addrmap->list4);
0139             if (ret_val != 0)
0140                 goto cfg_unlbl_map_add_failure;
0141             break;
0142             }
0143 #if IS_ENABLED(CONFIG_IPV6)
0144         case AF_INET6: {
0145             const struct in6_addr *addr6 = addr;
0146             const struct in6_addr *mask6 = mask;
0147             map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
0148             if (map6 == NULL)
0149                 goto cfg_unlbl_map_add_failure;
0150             map6->def.type = NETLBL_NLTYPE_UNLABELED;
0151             map6->list.addr = *addr6;
0152             map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
0153             map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
0154             map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
0155             map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
0156             map6->list.mask = *mask6;
0157             map6->list.valid = 1;
0158             ret_val = netlbl_af6list_add(&map6->list,
0159                              &addrmap->list6);
0160             if (ret_val != 0)
0161                 goto cfg_unlbl_map_add_failure;
0162             break;
0163             }
0164 #endif /* IPv6 */
0165         default:
0166             goto cfg_unlbl_map_add_failure;
0167         }
0168 
0169         entry->def.addrsel = addrmap;
0170         entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
0171     } else {
0172         ret_val = -EINVAL;
0173         goto cfg_unlbl_map_add_failure;
0174     }
0175 
0176     ret_val = netlbl_domhsh_add(entry, audit_info);
0177     if (ret_val != 0)
0178         goto cfg_unlbl_map_add_failure;
0179 
0180     return 0;
0181 
0182 cfg_unlbl_map_add_failure:
0183     kfree(entry->domain);
0184     kfree(entry);
0185     kfree(addrmap);
0186     kfree(map4);
0187     kfree(map6);
0188     return ret_val;
0189 }
0190 
0191 
0192 /**
0193  * netlbl_cfg_unlbl_static_add - Adds a new static label
0194  * @net: network namespace
0195  * @dev_name: interface name
0196  * @addr: IP address in network byte order (struct in[6]_addr)
0197  * @mask: address mask in network byte order (struct in[6]_addr)
0198  * @family: address family
0199  * @secid: LSM secid value for the entry
0200  * @audit_info: NetLabel audit information
0201  *
0202  * Description:
0203  * Adds a new NetLabel static label to be used when protocol provided labels
0204  * are not present on incoming traffic.  If @dev_name is NULL then the default
0205  * interface will be used.  Returns zero on success, negative values on failure.
0206  *
0207  */
0208 int netlbl_cfg_unlbl_static_add(struct net *net,
0209                 const char *dev_name,
0210                 const void *addr,
0211                 const void *mask,
0212                 u16 family,
0213                 u32 secid,
0214                 struct netlbl_audit *audit_info)
0215 {
0216     u32 addr_len;
0217 
0218     switch (family) {
0219     case AF_INET:
0220         addr_len = sizeof(struct in_addr);
0221         break;
0222 #if IS_ENABLED(CONFIG_IPV6)
0223     case AF_INET6:
0224         addr_len = sizeof(struct in6_addr);
0225         break;
0226 #endif /* IPv6 */
0227     default:
0228         return -EPFNOSUPPORT;
0229     }
0230 
0231     return netlbl_unlhsh_add(net,
0232                  dev_name, addr, mask, addr_len,
0233                  secid, audit_info);
0234 }
0235 
0236 /**
0237  * netlbl_cfg_unlbl_static_del - Removes an existing static label
0238  * @net: network namespace
0239  * @dev_name: interface name
0240  * @addr: IP address in network byte order (struct in[6]_addr)
0241  * @mask: address mask in network byte order (struct in[6]_addr)
0242  * @family: address family
0243  * @audit_info: NetLabel audit information
0244  *
0245  * Description:
0246  * Removes an existing NetLabel static label used when protocol provided labels
0247  * are not present on incoming traffic.  If @dev_name is NULL then the default
0248  * interface will be used.  Returns zero on success, negative values on failure.
0249  *
0250  */
0251 int netlbl_cfg_unlbl_static_del(struct net *net,
0252                 const char *dev_name,
0253                 const void *addr,
0254                 const void *mask,
0255                 u16 family,
0256                 struct netlbl_audit *audit_info)
0257 {
0258     u32 addr_len;
0259 
0260     switch (family) {
0261     case AF_INET:
0262         addr_len = sizeof(struct in_addr);
0263         break;
0264 #if IS_ENABLED(CONFIG_IPV6)
0265     case AF_INET6:
0266         addr_len = sizeof(struct in6_addr);
0267         break;
0268 #endif /* IPv6 */
0269     default:
0270         return -EPFNOSUPPORT;
0271     }
0272 
0273     return netlbl_unlhsh_remove(net,
0274                     dev_name, addr, mask, addr_len,
0275                     audit_info);
0276 }
0277 
0278 /**
0279  * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
0280  * @doi_def: CIPSO DOI definition
0281  * @audit_info: NetLabel audit information
0282  *
0283  * Description:
0284  * Add a new CIPSO DOI definition as defined by @doi_def.  Returns zero on
0285  * success and negative values on failure.
0286  *
0287  */
0288 int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
0289                struct netlbl_audit *audit_info)
0290 {
0291     return cipso_v4_doi_add(doi_def, audit_info);
0292 }
0293 
0294 /**
0295  * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
0296  * @doi: CIPSO DOI
0297  * @audit_info: NetLabel audit information
0298  *
0299  * Description:
0300  * Remove an existing CIPSO DOI definition matching @doi.  Returns zero on
0301  * success and negative values on failure.
0302  *
0303  */
0304 void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
0305 {
0306     cipso_v4_doi_remove(doi, audit_info);
0307 }
0308 
0309 /**
0310  * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
0311  * @doi: the CIPSO DOI
0312  * @domain: the domain mapping to add
0313  * @addr: IP address
0314  * @mask: IP address mask
0315  * @audit_info: NetLabel audit information
0316  *
0317  * Description:
0318  * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
0319  * subsystem.  A @domain value of NULL adds a new default domain mapping.
0320  * Returns zero on success, negative values on failure.
0321  *
0322  */
0323 int netlbl_cfg_cipsov4_map_add(u32 doi,
0324                    const char *domain,
0325                    const struct in_addr *addr,
0326                    const struct in_addr *mask,
0327                    struct netlbl_audit *audit_info)
0328 {
0329     int ret_val = -ENOMEM;
0330     struct cipso_v4_doi *doi_def;
0331     struct netlbl_dom_map *entry;
0332     struct netlbl_domaddr_map *addrmap = NULL;
0333     struct netlbl_domaddr4_map *addrinfo = NULL;
0334 
0335     doi_def = cipso_v4_doi_getdef(doi);
0336     if (doi_def == NULL)
0337         return -ENOENT;
0338 
0339     entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
0340     if (entry == NULL)
0341         goto out_entry;
0342     entry->family = AF_INET;
0343     if (domain != NULL) {
0344         entry->domain = kstrdup(domain, GFP_ATOMIC);
0345         if (entry->domain == NULL)
0346             goto out_domain;
0347     }
0348 
0349     if (addr == NULL && mask == NULL) {
0350         entry->def.cipso = doi_def;
0351         entry->def.type = NETLBL_NLTYPE_CIPSOV4;
0352     } else if (addr != NULL && mask != NULL) {
0353         addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
0354         if (addrmap == NULL)
0355             goto out_addrmap;
0356         INIT_LIST_HEAD(&addrmap->list4);
0357         INIT_LIST_HEAD(&addrmap->list6);
0358 
0359         addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
0360         if (addrinfo == NULL)
0361             goto out_addrinfo;
0362         addrinfo->def.cipso = doi_def;
0363         addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
0364         addrinfo->list.addr = addr->s_addr & mask->s_addr;
0365         addrinfo->list.mask = mask->s_addr;
0366         addrinfo->list.valid = 1;
0367         ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
0368         if (ret_val != 0)
0369             goto cfg_cipsov4_map_add_failure;
0370 
0371         entry->def.addrsel = addrmap;
0372         entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
0373     } else {
0374         ret_val = -EINVAL;
0375         goto out_addrmap;
0376     }
0377 
0378     ret_val = netlbl_domhsh_add(entry, audit_info);
0379     if (ret_val != 0)
0380         goto cfg_cipsov4_map_add_failure;
0381 
0382     return 0;
0383 
0384 cfg_cipsov4_map_add_failure:
0385     kfree(addrinfo);
0386 out_addrinfo:
0387     kfree(addrmap);
0388 out_addrmap:
0389     kfree(entry->domain);
0390 out_domain:
0391     kfree(entry);
0392 out_entry:
0393     cipso_v4_doi_putdef(doi_def);
0394     return ret_val;
0395 }
0396 
0397 /**
0398  * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
0399  * @doi_def: CALIPSO DOI definition
0400  * @audit_info: NetLabel audit information
0401  *
0402  * Description:
0403  * Add a new CALIPSO DOI definition as defined by @doi_def.  Returns zero on
0404  * success and negative values on failure.
0405  *
0406  */
0407 int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
0408                struct netlbl_audit *audit_info)
0409 {
0410 #if IS_ENABLED(CONFIG_IPV6)
0411     return calipso_doi_add(doi_def, audit_info);
0412 #else /* IPv6 */
0413     return -ENOSYS;
0414 #endif /* IPv6 */
0415 }
0416 
0417 /**
0418  * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
0419  * @doi: CALIPSO DOI
0420  * @audit_info: NetLabel audit information
0421  *
0422  * Description:
0423  * Remove an existing CALIPSO DOI definition matching @doi.  Returns zero on
0424  * success and negative values on failure.
0425  *
0426  */
0427 void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
0428 {
0429 #if IS_ENABLED(CONFIG_IPV6)
0430     calipso_doi_remove(doi, audit_info);
0431 #endif /* IPv6 */
0432 }
0433 
0434 /**
0435  * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
0436  * @doi: the CALIPSO DOI
0437  * @domain: the domain mapping to add
0438  * @addr: IP address
0439  * @mask: IP address mask
0440  * @audit_info: NetLabel audit information
0441  *
0442  * Description:
0443  * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
0444  * NetLabel subsystem.  A @domain value of NULL adds a new default domain
0445  * mapping.  Returns zero on success, negative values on failure.
0446  *
0447  */
0448 int netlbl_cfg_calipso_map_add(u32 doi,
0449                    const char *domain,
0450                    const struct in6_addr *addr,
0451                    const struct in6_addr *mask,
0452                    struct netlbl_audit *audit_info)
0453 {
0454 #if IS_ENABLED(CONFIG_IPV6)
0455     int ret_val = -ENOMEM;
0456     struct calipso_doi *doi_def;
0457     struct netlbl_dom_map *entry;
0458     struct netlbl_domaddr_map *addrmap = NULL;
0459     struct netlbl_domaddr6_map *addrinfo = NULL;
0460 
0461     doi_def = calipso_doi_getdef(doi);
0462     if (doi_def == NULL)
0463         return -ENOENT;
0464 
0465     entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
0466     if (entry == NULL)
0467         goto out_entry;
0468     entry->family = AF_INET6;
0469     if (domain != NULL) {
0470         entry->domain = kstrdup(domain, GFP_ATOMIC);
0471         if (entry->domain == NULL)
0472             goto out_domain;
0473     }
0474 
0475     if (addr == NULL && mask == NULL) {
0476         entry->def.calipso = doi_def;
0477         entry->def.type = NETLBL_NLTYPE_CALIPSO;
0478     } else if (addr != NULL && mask != NULL) {
0479         addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
0480         if (addrmap == NULL)
0481             goto out_addrmap;
0482         INIT_LIST_HEAD(&addrmap->list4);
0483         INIT_LIST_HEAD(&addrmap->list6);
0484 
0485         addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
0486         if (addrinfo == NULL)
0487             goto out_addrinfo;
0488         addrinfo->def.calipso = doi_def;
0489         addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
0490         addrinfo->list.addr = *addr;
0491         addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
0492         addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
0493         addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
0494         addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
0495         addrinfo->list.mask = *mask;
0496         addrinfo->list.valid = 1;
0497         ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
0498         if (ret_val != 0)
0499             goto cfg_calipso_map_add_failure;
0500 
0501         entry->def.addrsel = addrmap;
0502         entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
0503     } else {
0504         ret_val = -EINVAL;
0505         goto out_addrmap;
0506     }
0507 
0508     ret_val = netlbl_domhsh_add(entry, audit_info);
0509     if (ret_val != 0)
0510         goto cfg_calipso_map_add_failure;
0511 
0512     return 0;
0513 
0514 cfg_calipso_map_add_failure:
0515     kfree(addrinfo);
0516 out_addrinfo:
0517     kfree(addrmap);
0518 out_addrmap:
0519     kfree(entry->domain);
0520 out_domain:
0521     kfree(entry);
0522 out_entry:
0523     calipso_doi_putdef(doi_def);
0524     return ret_val;
0525 #else /* IPv6 */
0526     return -ENOSYS;
0527 #endif /* IPv6 */
0528 }
0529 
0530 /*
0531  * Security Attribute Functions
0532  */
0533 
0534 #define _CM_F_NONE  0x00000000
0535 #define _CM_F_ALLOC 0x00000001
0536 #define _CM_F_WALK  0x00000002
0537 
0538 /**
0539  * _netlbl_catmap_getnode - Get a individual node from a catmap
0540  * @catmap: pointer to the category bitmap
0541  * @offset: the requested offset
0542  * @cm_flags: catmap flags, see _CM_F_*
0543  * @gfp_flags: memory allocation flags
0544  *
0545  * Description:
0546  * Iterate through the catmap looking for the node associated with @offset.
0547  * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
0548  * one will be created and inserted into the catmap.  If the _CM_F_WALK flag is
0549  * set in @cm_flags and there is no associated node, the next highest node will
0550  * be returned.  Returns a pointer to the node on success, NULL on failure.
0551  *
0552  */
0553 static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
0554                          struct netlbl_lsm_catmap **catmap,
0555                          u32 offset,
0556                          unsigned int cm_flags,
0557                          gfp_t gfp_flags)
0558 {
0559     struct netlbl_lsm_catmap *iter = *catmap;
0560     struct netlbl_lsm_catmap *prev = NULL;
0561 
0562     if (iter == NULL)
0563         goto catmap_getnode_alloc;
0564     if (offset < iter->startbit)
0565         goto catmap_getnode_walk;
0566     while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
0567         prev = iter;
0568         iter = iter->next;
0569     }
0570     if (iter == NULL || offset < iter->startbit)
0571         goto catmap_getnode_walk;
0572 
0573     return iter;
0574 
0575 catmap_getnode_walk:
0576     if (cm_flags & _CM_F_WALK)
0577         return iter;
0578 catmap_getnode_alloc:
0579     if (!(cm_flags & _CM_F_ALLOC))
0580         return NULL;
0581 
0582     iter = netlbl_catmap_alloc(gfp_flags);
0583     if (iter == NULL)
0584         return NULL;
0585     iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);
0586 
0587     if (prev == NULL) {
0588         iter->next = *catmap;
0589         *catmap = iter;
0590     } else {
0591         iter->next = prev->next;
0592         prev->next = iter;
0593     }
0594 
0595     return iter;
0596 }
0597 
0598 /**
0599  * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
0600  * @catmap: the category bitmap
0601  * @offset: the offset to start searching at, in bits
0602  *
0603  * Description:
0604  * This function walks a LSM secattr category bitmap starting at @offset and
0605  * returns the spot of the first set bit or -ENOENT if no bits are set.
0606  *
0607  */
0608 int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
0609 {
0610     struct netlbl_lsm_catmap *iter;
0611     u32 idx;
0612     u32 bit;
0613     NETLBL_CATMAP_MAPTYPE bitmap;
0614 
0615     iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
0616     if (iter == NULL)
0617         return -ENOENT;
0618     if (offset > iter->startbit) {
0619         offset -= iter->startbit;
0620         idx = offset / NETLBL_CATMAP_MAPSIZE;
0621         bit = offset % NETLBL_CATMAP_MAPSIZE;
0622     } else {
0623         idx = 0;
0624         bit = 0;
0625     }
0626     bitmap = iter->bitmap[idx] >> bit;
0627 
0628     for (;;) {
0629         if (bitmap != 0) {
0630             while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
0631                 bitmap >>= 1;
0632                 bit++;
0633             }
0634             return iter->startbit +
0635                    (NETLBL_CATMAP_MAPSIZE * idx) + bit;
0636         }
0637         if (++idx >= NETLBL_CATMAP_MAPCNT) {
0638             if (iter->next != NULL) {
0639                 iter = iter->next;
0640                 idx = 0;
0641             } else
0642                 return -ENOENT;
0643         }
0644         bitmap = iter->bitmap[idx];
0645         bit = 0;
0646     }
0647 
0648     return -ENOENT;
0649 }
0650 EXPORT_SYMBOL(netlbl_catmap_walk);
0651 
0652 /**
0653  * netlbl_catmap_walkrng - Find the end of a string of set bits
0654  * @catmap: the category bitmap
0655  * @offset: the offset to start searching at, in bits
0656  *
0657  * Description:
0658  * This function walks a LSM secattr category bitmap starting at @offset and
0659  * returns the spot of the first cleared bit or -ENOENT if the offset is past
0660  * the end of the bitmap.
0661  *
0662  */
0663 int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
0664 {
0665     struct netlbl_lsm_catmap *iter;
0666     struct netlbl_lsm_catmap *prev = NULL;
0667     u32 idx;
0668     u32 bit;
0669     NETLBL_CATMAP_MAPTYPE bitmask;
0670     NETLBL_CATMAP_MAPTYPE bitmap;
0671 
0672     iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
0673     if (iter == NULL)
0674         return -ENOENT;
0675     if (offset > iter->startbit) {
0676         offset -= iter->startbit;
0677         idx = offset / NETLBL_CATMAP_MAPSIZE;
0678         bit = offset % NETLBL_CATMAP_MAPSIZE;
0679     } else {
0680         idx = 0;
0681         bit = 0;
0682     }
0683     bitmask = NETLBL_CATMAP_BIT << bit;
0684 
0685     for (;;) {
0686         bitmap = iter->bitmap[idx];
0687         while (bitmask != 0 && (bitmap & bitmask) != 0) {
0688             bitmask <<= 1;
0689             bit++;
0690         }
0691 
0692         if (prev && idx == 0 && bit == 0)
0693             return prev->startbit + NETLBL_CATMAP_SIZE - 1;
0694         else if (bitmask != 0)
0695             return iter->startbit +
0696                 (NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
0697         else if (++idx >= NETLBL_CATMAP_MAPCNT) {
0698             if (iter->next == NULL)
0699                 return iter->startbit + NETLBL_CATMAP_SIZE - 1;
0700             prev = iter;
0701             iter = iter->next;
0702             idx = 0;
0703         }
0704         bitmask = NETLBL_CATMAP_BIT;
0705         bit = 0;
0706     }
0707 
0708     return -ENOENT;
0709 }
0710 
0711 /**
0712  * netlbl_catmap_getlong - Export an unsigned long bitmap
0713  * @catmap: pointer to the category bitmap
0714  * @offset: pointer to the requested offset
0715  * @bitmap: the exported bitmap
0716  *
0717  * Description:
0718  * Export a bitmap with an offset greater than or equal to @offset and return
0719  * it in @bitmap.  The @offset must be aligned to an unsigned long and will be
0720  * updated on return if different from what was requested; if the catmap is
0721  * empty at the requested offset and beyond, the @offset is set to (u32)-1.
0722  * Returns zero on success, negative values on failure.
0723  *
0724  */
0725 int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
0726               u32 *offset,
0727               unsigned long *bitmap)
0728 {
0729     struct netlbl_lsm_catmap *iter;
0730     u32 off = *offset;
0731     u32 idx;
0732 
0733     /* only allow aligned offsets */
0734     if ((off & (BITS_PER_LONG - 1)) != 0)
0735         return -EINVAL;
0736 
0737     /* a null catmap is equivalent to an empty one */
0738     if (!catmap) {
0739         *offset = (u32)-1;
0740         return 0;
0741     }
0742 
0743     if (off < catmap->startbit) {
0744         off = catmap->startbit;
0745         *offset = off;
0746     }
0747     iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
0748     if (iter == NULL) {
0749         *offset = (u32)-1;
0750         return 0;
0751     }
0752 
0753     if (off < iter->startbit) {
0754         *offset = iter->startbit;
0755         off = 0;
0756     } else
0757         off -= iter->startbit;
0758     idx = off / NETLBL_CATMAP_MAPSIZE;
0759     *bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
0760 
0761     return 0;
0762 }
0763 
0764 /**
0765  * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
0766  * @catmap: pointer to the category bitmap
0767  * @bit: the bit to set
0768  * @flags: memory allocation flags
0769  *
0770  * Description:
0771  * Set the bit specified by @bit in @catmap.  Returns zero on success,
0772  * negative values on failure.
0773  *
0774  */
0775 int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
0776              u32 bit,
0777              gfp_t flags)
0778 {
0779     struct netlbl_lsm_catmap *iter;
0780     u32 idx;
0781 
0782     iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
0783     if (iter == NULL)
0784         return -ENOMEM;
0785 
0786     bit -= iter->startbit;
0787     idx = bit / NETLBL_CATMAP_MAPSIZE;
0788     iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);
0789 
0790     return 0;
0791 }
0792 EXPORT_SYMBOL(netlbl_catmap_setbit);
0793 
0794 /**
0795  * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
0796  * @catmap: pointer to the category bitmap
0797  * @start: the starting bit
0798  * @end: the last bit in the string
0799  * @flags: memory allocation flags
0800  *
0801  * Description:
0802  * Set a range of bits, starting at @start and ending with @end.  Returns zero
0803  * on success, negative values on failure.
0804  *
0805  */
0806 int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
0807              u32 start,
0808              u32 end,
0809              gfp_t flags)
0810 {
0811     int rc = 0;
0812     u32 spot = start;
0813 
0814     while (rc == 0 && spot <= end) {
0815         if (((spot & (BITS_PER_LONG - 1)) == 0) &&
0816             ((end - spot) > BITS_PER_LONG)) {
0817             rc = netlbl_catmap_setlong(catmap,
0818                            spot,
0819                            (unsigned long)-1,
0820                            flags);
0821             spot += BITS_PER_LONG;
0822         } else
0823             rc = netlbl_catmap_setbit(catmap, spot++, flags);
0824     }
0825 
0826     return rc;
0827 }
0828 
0829 /**
0830  * netlbl_catmap_setlong - Import an unsigned long bitmap
0831  * @catmap: pointer to the category bitmap
0832  * @offset: offset to the start of the imported bitmap
0833  * @bitmap: the bitmap to import
0834  * @flags: memory allocation flags
0835  *
0836  * Description:
0837  * Import the bitmap specified in @bitmap into @catmap, using the offset
0838  * in @offset.  The offset must be aligned to an unsigned long.  Returns zero
0839  * on success, negative values on failure.
0840  *
0841  */
0842 int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
0843               u32 offset,
0844               unsigned long bitmap,
0845               gfp_t flags)
0846 {
0847     struct netlbl_lsm_catmap *iter;
0848     u32 idx;
0849 
0850     /* only allow aligned offsets */
0851     if ((offset & (BITS_PER_LONG - 1)) != 0)
0852         return -EINVAL;
0853 
0854     iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
0855     if (iter == NULL)
0856         return -ENOMEM;
0857 
0858     offset -= iter->startbit;
0859     idx = offset / NETLBL_CATMAP_MAPSIZE;
0860     iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);
0861 
0862     return 0;
0863 }
0864 
0865 /* Bitmap functions
0866  */
0867 
0868 /**
0869  * netlbl_bitmap_walk - Walk a bitmap looking for a bit
0870  * @bitmap: the bitmap
0871  * @bitmap_len: length in bits
0872  * @offset: starting offset
0873  * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
0874  *
0875  * Description:
0876  * Starting at @offset, walk the bitmap from left to right until either the
0877  * desired bit is found or we reach the end.  Return the bit offset, -1 if
0878  * not found, or -2 if error.
0879  */
0880 int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
0881                u32 offset, u8 state)
0882 {
0883     u32 bit_spot;
0884     u32 byte_offset;
0885     unsigned char bitmask;
0886     unsigned char byte;
0887 
0888     if (offset >= bitmap_len)
0889         return -1;
0890     byte_offset = offset / 8;
0891     byte = bitmap[byte_offset];
0892     bit_spot = offset;
0893     bitmask = 0x80 >> (offset % 8);
0894 
0895     while (bit_spot < bitmap_len) {
0896         if ((state && (byte & bitmask) == bitmask) ||
0897             (state == 0 && (byte & bitmask) == 0))
0898             return bit_spot;
0899 
0900         if (++bit_spot >= bitmap_len)
0901             return -1;
0902         bitmask >>= 1;
0903         if (bitmask == 0) {
0904             byte = bitmap[++byte_offset];
0905             bitmask = 0x80;
0906         }
0907     }
0908 
0909     return -1;
0910 }
0911 EXPORT_SYMBOL(netlbl_bitmap_walk);
0912 
0913 /**
0914  * netlbl_bitmap_setbit - Sets a single bit in a bitmap
0915  * @bitmap: the bitmap
0916  * @bit: the bit
0917  * @state: if non-zero, set the bit (1) else clear the bit (0)
0918  *
0919  * Description:
0920  * Set a single bit in the bitmask.  Returns zero on success, negative values
0921  * on error.
0922  */
0923 void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
0924 {
0925     u32 byte_spot;
0926     u8 bitmask;
0927 
0928     /* gcc always rounds to zero when doing integer division */
0929     byte_spot = bit / 8;
0930     bitmask = 0x80 >> (bit % 8);
0931     if (state)
0932         bitmap[byte_spot] |= bitmask;
0933     else
0934         bitmap[byte_spot] &= ~bitmask;
0935 }
0936 EXPORT_SYMBOL(netlbl_bitmap_setbit);
0937 
0938 /*
0939  * LSM Functions
0940  */
0941 
0942 /**
0943  * netlbl_enabled - Determine if the NetLabel subsystem is enabled
0944  *
0945  * Description:
0946  * The LSM can use this function to determine if it should use NetLabel
0947  * security attributes in it's enforcement mechanism.  Currently, NetLabel is
0948  * considered to be enabled when it's configuration contains a valid setup for
0949  * at least one labeled protocol (i.e. NetLabel can understand incoming
0950  * labeled packets of at least one type); otherwise NetLabel is considered to
0951  * be disabled.
0952  *
0953  */
0954 int netlbl_enabled(void)
0955 {
0956     /* At some point we probably want to expose this mechanism to the user
0957      * as well so that admins can toggle NetLabel regardless of the
0958      * configuration */
0959     return (atomic_read(&netlabel_mgmt_protocount) > 0);
0960 }
0961 
0962 /**
0963  * netlbl_sock_setattr - Label a socket using the correct protocol
0964  * @sk: the socket to label
0965  * @family: protocol family
0966  * @secattr: the security attributes
0967  *
0968  * Description:
0969  * Attach the correct label to the given socket using the security attributes
0970  * specified in @secattr.  This function requires exclusive access to @sk,
0971  * which means it either needs to be in the process of being created or locked.
0972  * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
0973  * network address selectors (can't blindly label the socket), and negative
0974  * values on all other failures.
0975  *
0976  */
0977 int netlbl_sock_setattr(struct sock *sk,
0978             u16 family,
0979             const struct netlbl_lsm_secattr *secattr)
0980 {
0981     int ret_val;
0982     struct netlbl_dom_map *dom_entry;
0983 
0984     rcu_read_lock();
0985     dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
0986     if (dom_entry == NULL) {
0987         ret_val = -ENOENT;
0988         goto socket_setattr_return;
0989     }
0990     switch (family) {
0991     case AF_INET:
0992         switch (dom_entry->def.type) {
0993         case NETLBL_NLTYPE_ADDRSELECT:
0994             ret_val = -EDESTADDRREQ;
0995             break;
0996         case NETLBL_NLTYPE_CIPSOV4:
0997             ret_val = cipso_v4_sock_setattr(sk,
0998                             dom_entry->def.cipso,
0999                             secattr);
1000             break;
1001         case NETLBL_NLTYPE_UNLABELED:
1002             ret_val = 0;
1003             break;
1004         default:
1005             ret_val = -ENOENT;
1006         }
1007         break;
1008 #if IS_ENABLED(CONFIG_IPV6)
1009     case AF_INET6:
1010         switch (dom_entry->def.type) {
1011         case NETLBL_NLTYPE_ADDRSELECT:
1012             ret_val = -EDESTADDRREQ;
1013             break;
1014         case NETLBL_NLTYPE_CALIPSO:
1015             ret_val = calipso_sock_setattr(sk,
1016                                dom_entry->def.calipso,
1017                                secattr);
1018             break;
1019         case NETLBL_NLTYPE_UNLABELED:
1020             ret_val = 0;
1021             break;
1022         default:
1023             ret_val = -ENOENT;
1024         }
1025         break;
1026 #endif /* IPv6 */
1027     default:
1028         ret_val = -EPROTONOSUPPORT;
1029     }
1030 
1031 socket_setattr_return:
1032     rcu_read_unlock();
1033     return ret_val;
1034 }
1035 
1036 /**
1037  * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
1038  * @sk: the socket
1039  *
1040  * Description:
1041  * Remove all the NetLabel labeling from @sk.  The caller is responsible for
1042  * ensuring that @sk is locked.
1043  *
1044  */
1045 void netlbl_sock_delattr(struct sock *sk)
1046 {
1047     switch (sk->sk_family) {
1048     case AF_INET:
1049         cipso_v4_sock_delattr(sk);
1050         break;
1051 #if IS_ENABLED(CONFIG_IPV6)
1052     case AF_INET6:
1053         calipso_sock_delattr(sk);
1054         break;
1055 #endif /* IPv6 */
1056     }
1057 }
1058 
1059 /**
1060  * netlbl_sock_getattr - Determine the security attributes of a sock
1061  * @sk: the sock
1062  * @secattr: the security attributes
1063  *
1064  * Description:
1065  * Examines the given sock to see if any NetLabel style labeling has been
1066  * applied to the sock, if so it parses the socket label and returns the
1067  * security attributes in @secattr.  Returns zero on success, negative values
1068  * on failure.
1069  *
1070  */
1071 int netlbl_sock_getattr(struct sock *sk,
1072             struct netlbl_lsm_secattr *secattr)
1073 {
1074     int ret_val;
1075 
1076     switch (sk->sk_family) {
1077     case AF_INET:
1078         ret_val = cipso_v4_sock_getattr(sk, secattr);
1079         break;
1080 #if IS_ENABLED(CONFIG_IPV6)
1081     case AF_INET6:
1082         ret_val = calipso_sock_getattr(sk, secattr);
1083         break;
1084 #endif /* IPv6 */
1085     default:
1086         ret_val = -EPROTONOSUPPORT;
1087     }
1088 
1089     return ret_val;
1090 }
1091 
1092 /**
1093  * netlbl_conn_setattr - Label a connected socket using the correct protocol
1094  * @sk: the socket to label
1095  * @addr: the destination address
1096  * @secattr: the security attributes
1097  *
1098  * Description:
1099  * Attach the correct label to the given connected socket using the security
1100  * attributes specified in @secattr.  The caller is responsible for ensuring
1101  * that @sk is locked.  Returns zero on success, negative values on failure.
1102  *
1103  */
1104 int netlbl_conn_setattr(struct sock *sk,
1105             struct sockaddr *addr,
1106             const struct netlbl_lsm_secattr *secattr)
1107 {
1108     int ret_val;
1109     struct sockaddr_in *addr4;
1110 #if IS_ENABLED(CONFIG_IPV6)
1111     struct sockaddr_in6 *addr6;
1112 #endif
1113     struct netlbl_dommap_def *entry;
1114 
1115     rcu_read_lock();
1116     switch (addr->sa_family) {
1117     case AF_INET:
1118         addr4 = (struct sockaddr_in *)addr;
1119         entry = netlbl_domhsh_getentry_af4(secattr->domain,
1120                            addr4->sin_addr.s_addr);
1121         if (entry == NULL) {
1122             ret_val = -ENOENT;
1123             goto conn_setattr_return;
1124         }
1125         switch (entry->type) {
1126         case NETLBL_NLTYPE_CIPSOV4:
1127             ret_val = cipso_v4_sock_setattr(sk,
1128                             entry->cipso, secattr);
1129             break;
1130         case NETLBL_NLTYPE_UNLABELED:
1131             /* just delete the protocols we support for right now
1132              * but we could remove other protocols if needed */
1133             netlbl_sock_delattr(sk);
1134             ret_val = 0;
1135             break;
1136         default:
1137             ret_val = -ENOENT;
1138         }
1139         break;
1140 #if IS_ENABLED(CONFIG_IPV6)
1141     case AF_INET6:
1142         addr6 = (struct sockaddr_in6 *)addr;
1143         entry = netlbl_domhsh_getentry_af6(secattr->domain,
1144                            &addr6->sin6_addr);
1145         if (entry == NULL) {
1146             ret_val = -ENOENT;
1147             goto conn_setattr_return;
1148         }
1149         switch (entry->type) {
1150         case NETLBL_NLTYPE_CALIPSO:
1151             ret_val = calipso_sock_setattr(sk,
1152                                entry->calipso, secattr);
1153             break;
1154         case NETLBL_NLTYPE_UNLABELED:
1155             /* just delete the protocols we support for right now
1156              * but we could remove other protocols if needed */
1157             netlbl_sock_delattr(sk);
1158             ret_val = 0;
1159             break;
1160         default:
1161             ret_val = -ENOENT;
1162         }
1163         break;
1164 #endif /* IPv6 */
1165     default:
1166         ret_val = -EPROTONOSUPPORT;
1167     }
1168 
1169 conn_setattr_return:
1170     rcu_read_unlock();
1171     return ret_val;
1172 }
1173 
1174 /**
1175  * netlbl_req_setattr - Label a request socket using the correct protocol
1176  * @req: the request socket to label
1177  * @secattr: the security attributes
1178  *
1179  * Description:
1180  * Attach the correct label to the given socket using the security attributes
1181  * specified in @secattr.  Returns zero on success, negative values on failure.
1182  *
1183  */
1184 int netlbl_req_setattr(struct request_sock *req,
1185                const struct netlbl_lsm_secattr *secattr)
1186 {
1187     int ret_val;
1188     struct netlbl_dommap_def *entry;
1189     struct inet_request_sock *ireq = inet_rsk(req);
1190 
1191     rcu_read_lock();
1192     switch (req->rsk_ops->family) {
1193     case AF_INET:
1194         entry = netlbl_domhsh_getentry_af4(secattr->domain,
1195                            ireq->ir_rmt_addr);
1196         if (entry == NULL) {
1197             ret_val = -ENOENT;
1198             goto req_setattr_return;
1199         }
1200         switch (entry->type) {
1201         case NETLBL_NLTYPE_CIPSOV4:
1202             ret_val = cipso_v4_req_setattr(req,
1203                                entry->cipso, secattr);
1204             break;
1205         case NETLBL_NLTYPE_UNLABELED:
1206             netlbl_req_delattr(req);
1207             ret_val = 0;
1208             break;
1209         default:
1210             ret_val = -ENOENT;
1211         }
1212         break;
1213 #if IS_ENABLED(CONFIG_IPV6)
1214     case AF_INET6:
1215         entry = netlbl_domhsh_getentry_af6(secattr->domain,
1216                            &ireq->ir_v6_rmt_addr);
1217         if (entry == NULL) {
1218             ret_val = -ENOENT;
1219             goto req_setattr_return;
1220         }
1221         switch (entry->type) {
1222         case NETLBL_NLTYPE_CALIPSO:
1223             ret_val = calipso_req_setattr(req,
1224                               entry->calipso, secattr);
1225             break;
1226         case NETLBL_NLTYPE_UNLABELED:
1227             netlbl_req_delattr(req);
1228             ret_val = 0;
1229             break;
1230         default:
1231             ret_val = -ENOENT;
1232         }
1233         break;
1234 #endif /* IPv6 */
1235     default:
1236         ret_val = -EPROTONOSUPPORT;
1237     }
1238 
1239 req_setattr_return:
1240     rcu_read_unlock();
1241     return ret_val;
1242 }
1243 
1244 /**
1245 * netlbl_req_delattr - Delete all the NetLabel labels on a socket
1246 * @req: the socket
1247 *
1248 * Description:
1249 * Remove all the NetLabel labeling from @req.
1250 *
1251 */
1252 void netlbl_req_delattr(struct request_sock *req)
1253 {
1254     switch (req->rsk_ops->family) {
1255     case AF_INET:
1256         cipso_v4_req_delattr(req);
1257         break;
1258 #if IS_ENABLED(CONFIG_IPV6)
1259     case AF_INET6:
1260         calipso_req_delattr(req);
1261         break;
1262 #endif /* IPv6 */
1263     }
1264 }
1265 
1266 /**
1267  * netlbl_skbuff_setattr - Label a packet using the correct protocol
1268  * @skb: the packet
1269  * @family: protocol family
1270  * @secattr: the security attributes
1271  *
1272  * Description:
1273  * Attach the correct label to the given packet using the security attributes
1274  * specified in @secattr.  Returns zero on success, negative values on failure.
1275  *
1276  */
1277 int netlbl_skbuff_setattr(struct sk_buff *skb,
1278               u16 family,
1279               const struct netlbl_lsm_secattr *secattr)
1280 {
1281     int ret_val;
1282     struct iphdr *hdr4;
1283 #if IS_ENABLED(CONFIG_IPV6)
1284     struct ipv6hdr *hdr6;
1285 #endif
1286     struct netlbl_dommap_def *entry;
1287 
1288     rcu_read_lock();
1289     switch (family) {
1290     case AF_INET:
1291         hdr4 = ip_hdr(skb);
1292         entry = netlbl_domhsh_getentry_af4(secattr->domain,
1293                            hdr4->daddr);
1294         if (entry == NULL) {
1295             ret_val = -ENOENT;
1296             goto skbuff_setattr_return;
1297         }
1298         switch (entry->type) {
1299         case NETLBL_NLTYPE_CIPSOV4:
1300             ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
1301                               secattr);
1302             break;
1303         case NETLBL_NLTYPE_UNLABELED:
1304             /* just delete the protocols we support for right now
1305              * but we could remove other protocols if needed */
1306             ret_val = cipso_v4_skbuff_delattr(skb);
1307             break;
1308         default:
1309             ret_val = -ENOENT;
1310         }
1311         break;
1312 #if IS_ENABLED(CONFIG_IPV6)
1313     case AF_INET6:
1314         hdr6 = ipv6_hdr(skb);
1315         entry = netlbl_domhsh_getentry_af6(secattr->domain,
1316                            &hdr6->daddr);
1317         if (entry == NULL) {
1318             ret_val = -ENOENT;
1319             goto skbuff_setattr_return;
1320         }
1321         switch (entry->type) {
1322         case NETLBL_NLTYPE_CALIPSO:
1323             ret_val = calipso_skbuff_setattr(skb, entry->calipso,
1324                              secattr);
1325             break;
1326         case NETLBL_NLTYPE_UNLABELED:
1327             /* just delete the protocols we support for right now
1328              * but we could remove other protocols if needed */
1329             ret_val = calipso_skbuff_delattr(skb);
1330             break;
1331         default:
1332             ret_val = -ENOENT;
1333         }
1334         break;
1335 #endif /* IPv6 */
1336     default:
1337         ret_val = -EPROTONOSUPPORT;
1338     }
1339 
1340 skbuff_setattr_return:
1341     rcu_read_unlock();
1342     return ret_val;
1343 }
1344 
1345 /**
1346  * netlbl_skbuff_getattr - Determine the security attributes of a packet
1347  * @skb: the packet
1348  * @family: protocol family
1349  * @secattr: the security attributes
1350  *
1351  * Description:
1352  * Examines the given packet to see if a recognized form of packet labeling
1353  * is present, if so it parses the packet label and returns the security
1354  * attributes in @secattr.  Returns zero on success, negative values on
1355  * failure.
1356  *
1357  */
1358 int netlbl_skbuff_getattr(const struct sk_buff *skb,
1359               u16 family,
1360               struct netlbl_lsm_secattr *secattr)
1361 {
1362     unsigned char *ptr;
1363 
1364     switch (family) {
1365     case AF_INET:
1366         ptr = cipso_v4_optptr(skb);
1367         if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
1368             return 0;
1369         break;
1370 #if IS_ENABLED(CONFIG_IPV6)
1371     case AF_INET6:
1372         ptr = calipso_optptr(skb);
1373         if (ptr && calipso_getattr(ptr, secattr) == 0)
1374             return 0;
1375         break;
1376 #endif /* IPv6 */
1377     }
1378 
1379     return netlbl_unlabel_getattr(skb, family, secattr);
1380 }
1381 
1382 /**
1383  * netlbl_skbuff_err - Handle a LSM error on a sk_buff
1384  * @skb: the packet
1385  * @family: the family
1386  * @error: the error code
1387  * @gateway: true if host is acting as a gateway, false otherwise
1388  *
1389  * Description:
1390  * Deal with a LSM problem when handling the packet in @skb, typically this is
1391  * a permission denied problem (-EACCES).  The correct action is determined
1392  * according to the packet's labeling protocol.
1393  *
1394  */
1395 void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
1396 {
1397     switch (family) {
1398     case AF_INET:
1399         if (cipso_v4_optptr(skb))
1400             cipso_v4_error(skb, error, gateway);
1401         break;
1402     }
1403 }
1404 
1405 /**
1406  * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
1407  *
1408  * Description:
1409  * For all of the NetLabel protocols that support some form of label mapping
1410  * cache, invalidate the cache.  Returns zero on success, negative values on
1411  * error.
1412  *
1413  */
1414 void netlbl_cache_invalidate(void)
1415 {
1416     cipso_v4_cache_invalidate();
1417 #if IS_ENABLED(CONFIG_IPV6)
1418     calipso_cache_invalidate();
1419 #endif /* IPv6 */
1420 }
1421 
1422 /**
1423  * netlbl_cache_add - Add an entry to a NetLabel protocol cache
1424  * @skb: the packet
1425  * @family: the family
1426  * @secattr: the packet's security attributes
1427  *
1428  * Description:
1429  * Add the LSM security attributes for the given packet to the underlying
1430  * NetLabel protocol's label mapping cache.  Returns zero on success, negative
1431  * values on error.
1432  *
1433  */
1434 int netlbl_cache_add(const struct sk_buff *skb, u16 family,
1435              const struct netlbl_lsm_secattr *secattr)
1436 {
1437     unsigned char *ptr;
1438 
1439     if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
1440         return -ENOMSG;
1441 
1442     switch (family) {
1443     case AF_INET:
1444         ptr = cipso_v4_optptr(skb);
1445         if (ptr)
1446             return cipso_v4_cache_add(ptr, secattr);
1447         break;
1448 #if IS_ENABLED(CONFIG_IPV6)
1449     case AF_INET6:
1450         ptr = calipso_optptr(skb);
1451         if (ptr)
1452             return calipso_cache_add(ptr, secattr);
1453         break;
1454 #endif /* IPv6 */
1455     }
1456     return -ENOMSG;
1457 }
1458 
1459 /*
1460  * Protocol Engine Functions
1461  */
1462 
1463 /**
1464  * netlbl_audit_start - Start an audit message
1465  * @type: audit message type
1466  * @audit_info: NetLabel audit information
1467  *
1468  * Description:
1469  * Start an audit message using the type specified in @type and fill the audit
1470  * message with some fields common to all NetLabel audit messages.  This
1471  * function should only be used by protocol engines, not LSMs.  Returns a
1472  * pointer to the audit buffer on success, NULL on failure.
1473  *
1474  */
1475 struct audit_buffer *netlbl_audit_start(int type,
1476                     struct netlbl_audit *audit_info)
1477 {
1478     return netlbl_audit_start_common(type, audit_info);
1479 }
1480 EXPORT_SYMBOL(netlbl_audit_start);
1481 
1482 /*
1483  * Setup Functions
1484  */
1485 
1486 /**
1487  * netlbl_init - Initialize NetLabel
1488  *
1489  * Description:
1490  * Perform the required NetLabel initialization before first use.
1491  *
1492  */
1493 static int __init netlbl_init(void)
1494 {
1495     int ret_val;
1496 
1497     printk(KERN_INFO "NetLabel: Initializing\n");
1498     printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
1499            (1 << NETLBL_DOMHSH_BITSIZE));
1500     printk(KERN_INFO "NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO\n");
1501 
1502     ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
1503     if (ret_val != 0)
1504         goto init_failure;
1505 
1506     ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
1507     if (ret_val != 0)
1508         goto init_failure;
1509 
1510     ret_val = netlbl_netlink_init();
1511     if (ret_val != 0)
1512         goto init_failure;
1513 
1514     ret_val = netlbl_unlabel_defconf();
1515     if (ret_val != 0)
1516         goto init_failure;
1517     printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");
1518 
1519     return 0;
1520 
1521 init_failure:
1522     panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
1523 }
1524 
1525 subsys_initcall(netlbl_init);
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!