cregit-Linux how code gets into the kernel

Release 4.12 include/net/netlabel.h

Directory: include/net
/*
 * 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/>.
 *
 */

#ifndef _NETLABEL_H

#define _NETLABEL_H

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <net/netlink.h>
#include <net/request_sock.h>
#include <linux/atomic.h>

struct cipso_v4_doi;
struct calipso_doi;

/*
 * NetLabel - A management interface for maintaining network packet label
 *            mapping tables for explicit packet labling protocols.
 *
 * Network protocols such as CIPSO and RIPSO require a label translation layer
 * to convert the label on the packet into something meaningful on the host
 * machine.  In the current Linux implementation these mapping tables live
 * inside the kernel; NetLabel provides a mechanism for user space applications
 * to manage these mapping tables.
 *
 * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to
 * send messages between kernel and user space.  The general format of a
 * NetLabel message is shown below:
 *
 *  +-----------------+-------------------+--------- --- -- -
 *  | struct nlmsghdr | struct genlmsghdr | payload
 *  +-----------------+-------------------+--------- --- -- -
 *
 * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal.
 * The payload is dependent on the subsystem specified in the
 * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
 * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
 * file.  All of the fields in the NetLabel payload are NETLINK attributes, see
 * the include/net/netlink.h file for more information on NETLINK attributes.
 *
 */

/*
 * NetLabel NETLINK protocol
 */

/* NetLabel NETLINK protocol version
 *  1: initial version
 *  2: added static labels for unlabeled connections
 *  3: network selectors added to the NetLabel/LSM domain mapping and the
 *     CIPSO_V4_MAP_LOCAL CIPSO mapping was added
 */

#define NETLBL_PROTO_VERSION            3

/* NetLabel NETLINK types/families */

#define NETLBL_NLTYPE_NONE              0

#define NETLBL_NLTYPE_MGMT              1

#define NETLBL_NLTYPE_MGMT_NAME         "NLBL_MGMT"

#define NETLBL_NLTYPE_RIPSO             2

#define NETLBL_NLTYPE_RIPSO_NAME        "NLBL_RIPSO"

#define NETLBL_NLTYPE_CIPSOV4           3

#define NETLBL_NLTYPE_CIPSOV4_NAME      "NLBL_CIPSOv4"

#define NETLBL_NLTYPE_CIPSOV6           4

#define NETLBL_NLTYPE_CIPSOV6_NAME      "NLBL_CIPSOv6"

#define NETLBL_NLTYPE_UNLABELED         5

#define NETLBL_NLTYPE_UNLABELED_NAME    "NLBL_UNLBL"

#define NETLBL_NLTYPE_ADDRSELECT        6

#define NETLBL_NLTYPE_ADDRSELECT_NAME   "NLBL_ADRSEL"

#define NETLBL_NLTYPE_CALIPSO           7

#define NETLBL_NLTYPE_CALIPSO_NAME      "NLBL_CALIPSO"

/*
 * NetLabel - Kernel API for accessing the network packet label mappings.
 *
 * The following functions are provided for use by other kernel modules,
 * specifically kernel LSM modules, to provide a consistent, transparent API
 * for dealing with explicit packet labeling protocols such as CIPSO and
 * RIPSO.  The functions defined here are implemented in the
 * net/netlabel/netlabel_kapi.c file.
 *
 */

/* NetLabel audit information */

struct netlbl_audit {
	
u32 secid;
	
kuid_t loginuid;
	
unsigned int sessionid;
};

/*
 * LSM security attributes
 */

/**
 * struct netlbl_lsm_cache - NetLabel LSM security attribute cache
 * @refcount: atomic reference counter
 * @free: LSM supplied function to free the cache data
 * @data: LSM supplied cache data
 *
 * Description:
 * This structure is provided for LSMs which wish to make use of the NetLabel
 * caching mechanism to store LSM specific data/attributes in the NetLabel
 * cache.  If the LSM has to perform a lot of translation from the NetLabel
 * security attributes into it's own internal representation then the cache
 * mechanism can provide a way to eliminate some or all of that translation
 * overhead on a cache hit.
 *
 */

struct netlbl_lsm_cache {
	
atomic_t refcount;
	
void (*free) (const void *data);
	
void *data;
};

/**
 * struct netlbl_lsm_catmap - NetLabel LSM secattr category bitmap
 * @startbit: the value of the lowest order bit in the bitmap
 * @bitmap: the category bitmap
 * @next: pointer to the next bitmap "node" or NULL
 *
 * Description:
 * This structure is used to represent category bitmaps.  Due to the large
 * number of categories supported by most labeling protocols it is not
 * practical to transfer a full bitmap internally so NetLabel adopts a sparse
 * bitmap structure modeled after SELinux's ebitmap structure.
 * The catmap bitmap field MUST be a power of two in length and large
 * enough to hold at least 240 bits.  Special care (i.e. check the code!)
 * should be used when changing these values as the LSM implementation
 * probably has functions which rely on the sizes of these types to speed
 * processing.
 *
 */

#define NETLBL_CATMAP_MAPTYPE           u64

#define NETLBL_CATMAP_MAPCNT            4

#define NETLBL_CATMAP_MAPSIZE           (sizeof(NETLBL_CATMAP_MAPTYPE) * 8)

#define NETLBL_CATMAP_SIZE              (NETLBL_CATMAP_MAPSIZE * \
                                         NETLBL_CATMAP_MAPCNT)

#define NETLBL_CATMAP_BIT               (NETLBL_CATMAP_MAPTYPE)0x01

struct netlbl_lsm_catmap {
	
u32 startbit;
	
NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT];
	
struct netlbl_lsm_catmap *next;
};

/**
 * struct netlbl_lsm_secattr - NetLabel LSM security attributes
 * @flags: indicate structure attributes, see NETLBL_SECATTR_*
 * @type: indicate the NLTYPE of the attributes
 * @domain: the NetLabel LSM domain
 * @cache: NetLabel LSM specific cache
 * @attr.mls: MLS sensitivity label
 * @attr.mls.cat: MLS category bitmap
 * @attr.mls.lvl: MLS sensitivity level
 * @attr.secid: LSM specific secid token
 *
 * Description:
 * This structure is used to pass security attributes between NetLabel and the
 * LSM modules.  The flags field is used to specify which fields within the
 * struct are valid and valid values can be created by bitwise OR'ing the
 * NETLBL_SECATTR_* defines.  The domain field is typically set by the LSM to
 * specify domain specific configuration settings and is not usually used by
 * NetLabel itself when returning security attributes to the LSM.
 *
 */

struct netlbl_lsm_secattr {
	
u32 flags;
	/* bitmap values for 'flags' */

#define NETLBL_SECATTR_NONE             0x00000000

#define NETLBL_SECATTR_DOMAIN           0x00000001

#define NETLBL_SECATTR_DOMAIN_CPY       (NETLBL_SECATTR_DOMAIN | \
                                         NETLBL_SECATTR_FREE_DOMAIN)

#define NETLBL_SECATTR_CACHE            0x00000002

#define NETLBL_SECATTR_MLS_LVL          0x00000004

#define NETLBL_SECATTR_MLS_CAT          0x00000008

#define NETLBL_SECATTR_SECID            0x00000010
	/* bitmap meta-values for 'flags' */

#define NETLBL_SECATTR_FREE_DOMAIN      0x01000000

#define NETLBL_SECATTR_CACHEABLE        (NETLBL_SECATTR_MLS_LVL | \
                                         NETLBL_SECATTR_MLS_CAT | \
                                         NETLBL_SECATTR_SECID)
	
u32 type;
	
char *domain;
	
struct netlbl_lsm_cache *cache;
	struct {
		struct {
			
struct netlbl_lsm_catmap *cat;
			
u32 lvl;
		
} mls;
		
u32 secid;
	
} attr;
};

/**
 * struct netlbl_calipso_ops - NetLabel CALIPSO operations
 * @doi_add: add a CALIPSO DOI
 * @doi_free: free a CALIPSO DOI
 * @doi_getdef: returns a reference to a DOI
 * @doi_putdef: releases a reference of a DOI
 * @doi_walk: enumerate the DOI list
 * @sock_getattr: retrieve the socket's attr
 * @sock_setattr: set the socket's attr
 * @sock_delattr: remove the socket's attr
 * @req_setattr: set the req socket's attr
 * @req_delattr: remove the req socket's attr
 * @opt_getattr: retrieve attr from memory block
 * @skbuff_optptr: find option in packet
 * @skbuff_setattr: set the skbuff's attr
 * @skbuff_delattr: remove the skbuff's attr
 * @cache_invalidate: invalidate cache
 * @cache_add: add cache entry
 *
 * Description:
 * This structure is filled out by the CALIPSO engine and passed
 * to the NetLabel core via a call to netlbl_calipso_ops_register().
 * It enables the CALIPSO engine (and hence IPv6) to be compiled
 * as a module.
 */

struct netlbl_calipso_ops {
	
int (*doi_add)(struct calipso_doi *doi_def,
		       struct netlbl_audit *audit_info);
	
void (*doi_free)(struct calipso_doi *doi_def);
	
int (*doi_remove)(u32 doi, struct netlbl_audit *audit_info);
	
struct calipso_doi *(*doi_getdef)(u32 doi);
	
void (*doi_putdef)(struct calipso_doi *doi_def);
	
int (*doi_walk)(u32 *skip_cnt,
			int (*callback)(struct calipso_doi *doi_def, void *arg),
			void *cb_arg);
	
int (*sock_getattr)(struct sock *sk,
			    struct netlbl_lsm_secattr *secattr);
	
int (*sock_setattr)(struct sock *sk,
			    const struct calipso_doi *doi_def,
			    const struct netlbl_lsm_secattr *secattr);
	
void (*sock_delattr)(struct sock *sk);
	
int (*req_setattr)(struct request_sock *req,
			   const struct calipso_doi *doi_def,
			   const struct netlbl_lsm_secattr *secattr);
	
void (*req_delattr)(struct request_sock *req);
	
int (*opt_getattr)(const unsigned char *calipso,
			   struct netlbl_lsm_secattr *secattr);
	
unsigned char *(*skbuff_optptr)(const struct sk_buff *skb);
	
int (*skbuff_setattr)(struct sk_buff *skb,
			      const struct calipso_doi *doi_def,
			      const struct netlbl_lsm_secattr *secattr);
	
int (*skbuff_delattr)(struct sk_buff *skb);
	
void (*cache_invalidate)(void);
	
int (*cache_add)(const unsigned char *calipso_ptr,
			 const struct netlbl_lsm_secattr *secattr);
};

/*
 * LSM security attribute operations (inline)
 */

/**
 * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache
 * @flags: the memory allocation flags
 *
 * Description:
 * Allocate and initialize a netlbl_lsm_cache structure.  Returns a pointer
 * on success, NULL on failure.
 *
 */

static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags) { struct netlbl_lsm_cache *cache; cache = kzalloc(sizeof(*cache), flags); if (cache) atomic_set(&cache->refcount, 1); return cache; }

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/** * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct * @cache: the struct to free * * Description: * Frees @secattr including all of the internal buffers. * */
static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache) { if (!atomic_dec_and_test(&cache->refcount)) return; if (cache->free) cache->free(cache->data); kfree(cache); }

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/** * netlbl_catmap_alloc - Allocate a LSM secattr catmap * @flags: memory allocation flags * * Description: * Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL * on failure. * */
static inline struct netlbl_lsm_catmap *netlbl_catmap_alloc(gfp_t flags) { return kzalloc(sizeof(struct netlbl_lsm_catmap), flags); }

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/** * netlbl_catmap_free - Free a LSM secattr catmap * @catmap: the category bitmap * * Description: * Free a LSM secattr catmap. * */
static inline void netlbl_catmap_free(struct netlbl_lsm_catmap *catmap) { struct netlbl_lsm_catmap *iter; while (catmap) { iter = catmap; catmap = catmap->next; kfree(iter); } }

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/** * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct * @secattr: the struct to initialize * * Description: * Initialize an already allocated netlbl_lsm_secattr struct. * */
static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr) { memset(secattr, 0, sizeof(*secattr)); }

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/** * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct * @secattr: the struct to clear * * Description: * Destroys the @secattr struct, including freeing all of the internal buffers. * The struct must be reset with a call to netlbl_secattr_init() before reuse. * */
static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr) { if (secattr->flags & NETLBL_SECATTR_FREE_DOMAIN) kfree(secattr->domain); if (secattr->flags & NETLBL_SECATTR_CACHE) netlbl_secattr_cache_free(secattr->cache); if (secattr->flags & NETLBL_SECATTR_MLS_CAT) netlbl_catmap_free(secattr->attr.mls.cat); }

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/** * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct * @flags: the memory allocation flags * * Description: * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid * pointer on success, or NULL on failure. * */
static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags) { return kzalloc(sizeof(struct netlbl_lsm_secattr), flags); }

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/** * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct * @secattr: the struct to free * * Description: * Frees @secattr including all of the internal buffers. * */
static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr) { netlbl_secattr_destroy(secattr); kfree(secattr); }

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#ifdef CONFIG_NETLABEL /* * LSM configuration operations */ int netlbl_cfg_map_del(const char *domain, u16 family, const void *addr, const void *mask, struct netlbl_audit *audit_info); int netlbl_cfg_unlbl_map_add(const char *domain, u16 family, const void *addr, const void *mask, struct netlbl_audit *audit_info); 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); 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); int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, struct netlbl_audit *audit_info); void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info); 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 netlbl_cfg_calipso_add(struct calipso_doi *doi_def, struct netlbl_audit *audit_info); void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info); 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); /* * LSM security attribute operations */ int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset); int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset); int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, u32 *offset, unsigned long *bitmap); int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap, u32 bit, gfp_t flags); int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap, u32 start, u32 end, gfp_t flags); int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, u32 offset, unsigned long bitmap, gfp_t flags); /* Bitmap functions */ int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len, u32 offset, u8 state); void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state); /* * LSM protocol operations (NetLabel LSM/kernel API) */ int netlbl_enabled(void); int netlbl_sock_setattr(struct sock *sk, u16 family, const struct netlbl_lsm_secattr *secattr); void netlbl_sock_delattr(struct sock *sk); int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); int netlbl_conn_setattr(struct sock *sk, struct sockaddr *addr, const struct netlbl_lsm_secattr *secattr); int netlbl_req_setattr(struct request_sock *req, const struct netlbl_lsm_secattr *secattr); void netlbl_req_delattr(struct request_sock *req); int netlbl_skbuff_setattr(struct sk_buff *skb, u16 family, const struct netlbl_lsm_secattr *secattr); int netlbl_skbuff_getattr(const struct sk_buff *skb, u16 family, struct netlbl_lsm_secattr *secattr); void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway); /* * LSM label mapping cache operations */ void netlbl_cache_invalidate(void); int netlbl_cache_add(const struct sk_buff *skb, u16 family, const struct netlbl_lsm_secattr *secattr); /* * Protocol engine operations */ struct audit_buffer *netlbl_audit_start(int type, struct netlbl_audit *audit_info); #else
static inline int netlbl_cfg_map_del(const char *domain, u16 family, const void *addr, const void *mask, struct netlbl_audit *audit_info) { return -ENOSYS; }

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static inline int netlbl_cfg_unlbl_map_add(const char *domain, u16 family, void *addr, void *mask, struct netlbl_audit *audit_info) { return -ENOSYS; }

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static inline 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) { return -ENOSYS; }

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static inline 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) { return -ENOSYS; }

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static inline int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def, struct netlbl_audit *audit_info) { return -ENOSYS; }

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static inline void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info) { return; }

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static inline 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) { return -ENOSYS; }

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static inline int netlbl_cfg_calipso_add(struct calipso_doi *doi_def, struct netlbl_audit *audit_info) { return -ENOSYS; }

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static inline void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info) { return; }

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static inline 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) { return -ENOSYS; }

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static inline int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset) { return -ENOENT; }

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static inline int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset) { return -ENOENT; }

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static inline int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap, u32 *offset, unsigned long *bitmap) { return 0; }

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static inline int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap, u32 bit, gfp_t flags) { return 0; }

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static inline int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap, u32 start, u32 end, gfp_t flags) { return 0; }

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static inline int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap, u32 offset, unsigned long bitmap, gfp_t flags) { return 0; }

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static inline int netlbl_enabled(void) { return 0; }

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static inline int netlbl_sock_setattr(struct sock *sk, u16 family, const struct netlbl_lsm_secattr *secattr) { return -ENOSYS; }

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static inline void netlbl_sock_delattr(struct sock *sk) { }

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static inline int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) { return -ENOSYS; }

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static inline int netlbl_conn_setattr(struct sock *sk, struct sockaddr *addr, const struct netlbl_lsm_secattr *secattr) { return -ENOSYS; }

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static inline int netlbl_req_setattr(struct request_sock *req, const struct netlbl_lsm_secattr *secattr) { return -ENOSYS; }

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static inline void netlbl_req_delattr(struct request_sock *req) { return; }

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static inline int netlbl_skbuff_setattr(struct sk_buff *skb, u16 family, const struct netlbl_lsm_secattr *secattr) { return -ENOSYS; }

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static inline int netlbl_skbuff_getattr(const struct sk_buff *skb, u16 family, struct netlbl_lsm_secattr *secattr) { return -ENOSYS; }

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static inline void netlbl_skbuff_err(struct sk_buff *skb, int error, int gateway) { return; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Moore19100.00%2100.00%
Total19100.00%2100.00%


static inline void netlbl_cache_invalidate(void) { return; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Moore10100.00%1100.00%
Total10100.00%1100.00%


static inline int netlbl_cache_add(const struct sk_buff *skb, u16 family, const struct netlbl_lsm_secattr *secattr) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Moore2288.00%150.00%
Huw Davies312.00%150.00%
Total25100.00%2100.00%


static inline struct audit_buffer *netlbl_audit_start(int type, struct netlbl_audit *audit_info) { return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Moore20100.00%1100.00%
Total20100.00%1100.00%

#endif /* CONFIG_NETLABEL */ const struct netlbl_calipso_ops * netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops); #endif /* _NETLABEL_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Paul Moore161876.47%3163.27%
Huw Davies48723.02%1122.45%
Eric Paris40.19%24.08%
Tejun Heo30.14%12.04%
Jeff Kirsher10.05%12.04%
Arun Sharma10.05%12.04%
Al Viro10.05%12.04%
Eric W. Biedermann10.05%12.04%
Total2116100.00%49100.00%
Directory: include/net
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