1973c9f4fSDavid Howells /* Authentication token and access key management internal defs 21da177e4SLinus Torvalds * 376181c13SDavid Howells * Copyright (C) 2003-5, 2007 Red Hat, Inc. All Rights Reserved. 41da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #ifndef _INTERNAL_H 131da177e4SLinus Torvalds #define _INTERNAL_H 141da177e4SLinus Torvalds 15d84f4f99SDavid Howells #include <linux/sched.h> 165dd43ce2SIngo Molnar #include <linux/wait_bit.h> 175b825c3aSIngo Molnar #include <linux/cred.h> 1876181c13SDavid Howells #include <linux/key-type.h> 19413cd3d9SOleg Nesterov #include <linux/task_work.h> 20ddbb4114SMat Martineau #include <linux/keyctl.h> 21ddb99e11SElena Reshetova #include <linux/refcount.h> 22f1c316a3SStephan Mueller #include <linux/compat.h> 231da177e4SLinus Torvalds 24a27bb332SKent Overstreet struct iovec; 25a27bb332SKent Overstreet 2676181c13SDavid Howells #ifdef __KDEBUG 2776181c13SDavid Howells #define kenter(FMT, ...) \ 28dd6f953aSHarvey Harrison printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__) 2976181c13SDavid Howells #define kleave(FMT, ...) \ 30dd6f953aSHarvey Harrison printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__) 3176181c13SDavid Howells #define kdebug(FMT, ...) \ 32d84f4f99SDavid Howells printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__) 333e30148cSDavid Howells #else 3476181c13SDavid Howells #define kenter(FMT, ...) \ 35dd6f953aSHarvey Harrison no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__) 3676181c13SDavid Howells #define kleave(FMT, ...) \ 37dd6f953aSHarvey Harrison no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__) 3876181c13SDavid Howells #define kdebug(FMT, ...) \ 3976181c13SDavid Howells no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__) 403e30148cSDavid Howells #endif 413e30148cSDavid Howells 420c061b57SDavid Howells extern struct key_type key_type_dead; 431da177e4SLinus Torvalds extern struct key_type key_type_user; 449f6ed2caSJeff Layton extern struct key_type key_type_logon; 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /*****************************************************************************/ 471da177e4SLinus Torvalds /* 48973c9f4fSDavid Howells * Keep track of keys for a user. 49973c9f4fSDavid Howells * 50973c9f4fSDavid Howells * This needs to be separate to user_struct to avoid a refcount-loop 51973c9f4fSDavid Howells * (user_struct pins some keyrings which pin this struct). 52973c9f4fSDavid Howells * 53973c9f4fSDavid Howells * We also keep track of keys under request from userspace for this UID here. 541da177e4SLinus Torvalds */ 551da177e4SLinus Torvalds struct key_user { 561da177e4SLinus Torvalds struct rb_node node; 5776181c13SDavid Howells struct mutex cons_lock; /* construction initiation lock */ 581da177e4SLinus Torvalds spinlock_t lock; 59ddb99e11SElena Reshetova refcount_t usage; /* for accessing qnkeys & qnbytes */ 601da177e4SLinus Torvalds atomic_t nkeys; /* number of keys */ 611da177e4SLinus Torvalds atomic_t nikeys; /* number of instantiated keys */ 629a56c2dbSEric W. Biederman kuid_t uid; 631da177e4SLinus Torvalds int qnkeys; /* number of keys allocated to this user */ 641da177e4SLinus Torvalds int qnbytes; /* number of bytes allocated to this user */ 651da177e4SLinus Torvalds }; 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds extern struct rb_root key_user_tree; 681da177e4SLinus Torvalds extern spinlock_t key_user_lock; 691da177e4SLinus Torvalds extern struct key_user root_key_user; 701da177e4SLinus Torvalds 719a56c2dbSEric W. Biederman extern struct key_user *key_user_lookup(kuid_t uid); 721da177e4SLinus Torvalds extern void key_user_put(struct key_user *user); 731da177e4SLinus Torvalds 740b77f5bfSDavid Howells /* 75973c9f4fSDavid Howells * Key quota limits. 760b77f5bfSDavid Howells * - root has its own separate limits to everyone else 770b77f5bfSDavid Howells */ 780b77f5bfSDavid Howells extern unsigned key_quota_root_maxkeys; 790b77f5bfSDavid Howells extern unsigned key_quota_root_maxbytes; 800b77f5bfSDavid Howells extern unsigned key_quota_maxkeys; 810b77f5bfSDavid Howells extern unsigned key_quota_maxbytes; 820b77f5bfSDavid Howells 830b77f5bfSDavid Howells #define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */ 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds 868bc16deaSDavid Howells extern struct kmem_cache *key_jar; 871da177e4SLinus Torvalds extern struct rb_root key_serial_tree; 881da177e4SLinus Torvalds extern spinlock_t key_serial_lock; 8976181c13SDavid Howells extern struct mutex key_construction_mutex; 901da177e4SLinus Torvalds extern wait_queue_head_t request_key_conswq; 911da177e4SLinus Torvalds 92355ef8e1SDavid Howells extern void key_set_index_key(struct keyring_index_key *index_key); 93e9e349b0SDavid Howells extern struct key_type *key_type_lookup(const char *type); 94e9e349b0SDavid Howells extern void key_type_put(struct key_type *ktype); 95e9e349b0SDavid Howells 96df593ee2SDavid Howells extern int __key_link_lock(struct key *keyring, 97df593ee2SDavid Howells const struct keyring_index_key *index_key); 98ed0ac5c7SDavid Howells extern int __key_move_lock(struct key *l_keyring, struct key *u_keyring, 99ed0ac5c7SDavid Howells const struct keyring_index_key *index_key); 100f70e2e06SDavid Howells extern int __key_link_begin(struct key *keyring, 10116feef43SDavid Howells const struct keyring_index_key *index_key, 102b2a4df20SDavid Howells struct assoc_array_edit **_edit); 103f70e2e06SDavid Howells extern int __key_link_check_live_key(struct key *keyring, struct key *key); 104b2a4df20SDavid Howells extern void __key_link(struct key *key, struct assoc_array_edit **_edit); 105f70e2e06SDavid Howells extern void __key_link_end(struct key *keyring, 10616feef43SDavid Howells const struct keyring_index_key *index_key, 107b2a4df20SDavid Howells struct assoc_array_edit *edit); 1081da177e4SLinus Torvalds 109b2a4df20SDavid Howells extern key_ref_t find_key_to_update(key_ref_t keyring_ref, 110e57e8669SDavid Howells const struct keyring_index_key *index_key); 1111da177e4SLinus Torvalds 1123e30148cSDavid Howells extern struct key *keyring_search_instkey(struct key *keyring, 1133e30148cSDavid Howells key_serial_t target_id); 1143e30148cSDavid Howells 115b2a4df20SDavid Howells extern int iterate_over_keyring(const struct key *keyring, 116b2a4df20SDavid Howells int (*func)(const struct key *key, void *data), 117b2a4df20SDavid Howells void *data); 118b2a4df20SDavid Howells 1194bdf0bc3SDavid Howells struct keyring_search_context { 1204bdf0bc3SDavid Howells struct keyring_index_key index_key; 1214bdf0bc3SDavid Howells const struct cred *cred; 12246291959SDavid Howells struct key_match_data match_data; 1234bdf0bc3SDavid Howells unsigned flags; 124614d8c39SDavid Howells #define KEYRING_SEARCH_NO_STATE_CHECK 0x0001 /* Skip state checks */ 125614d8c39SDavid Howells #define KEYRING_SEARCH_DO_STATE_CHECK 0x0002 /* Override NO_STATE_CHECK */ 126614d8c39SDavid Howells #define KEYRING_SEARCH_NO_UPDATE_TIME 0x0004 /* Don't update times */ 127614d8c39SDavid Howells #define KEYRING_SEARCH_NO_CHECK_PERM 0x0008 /* Don't check permissions */ 128614d8c39SDavid Howells #define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0010 /* Give an error on excessive depth */ 1290b0a8415SDavid Howells #define KEYRING_SEARCH_SKIP_EXPIRED 0x0020 /* Ignore expired keys (intention to replace) */ 130dcf49dbcSDavid Howells #define KEYRING_SEARCH_RECURSE 0x0040 /* Search child keyrings also */ 1311da177e4SLinus Torvalds 132b2a4df20SDavid Howells int (*iterator)(const void *object, void *iterator_data); 133b2a4df20SDavid Howells 1344bdf0bc3SDavid Howells /* Internal stuff */ 1354bdf0bc3SDavid Howells int skipped_ret; 1364bdf0bc3SDavid Howells bool possessed; 1374bdf0bc3SDavid Howells key_ref_t result; 138074d5898SBaolin Wang time64_t now; 1394bdf0bc3SDavid Howells }; 1404bdf0bc3SDavid Howells 1410c903ab6SDavid Howells extern bool key_default_cmp(const struct key *key, 142c06cfb08SDavid Howells const struct key_match_data *match_data); 143e59428f7SDavid Howells extern key_ref_t keyring_search_rcu(key_ref_t keyring_ref, 1444bdf0bc3SDavid Howells struct keyring_search_context *ctx); 1454bdf0bc3SDavid Howells 146e59428f7SDavid Howells extern key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx); 147e59428f7SDavid Howells extern key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx); 1481da177e4SLinus Torvalds 149237bbd29SEric Biggers extern struct key *find_keyring_by_name(const char *name, bool uid_keyring); 1501da177e4SLinus Torvalds 1518bbf4976SDavid Howells extern int install_user_keyrings(void); 152d84f4f99SDavid Howells extern int install_thread_keyring_to_cred(struct cred *); 153d84f4f99SDavid Howells extern int install_process_keyring_to_cred(struct cred *); 154685bfd2cSOleg Nesterov extern int install_session_keyring_to_cred(struct cred *, struct key *); 1553e30148cSDavid Howells 1563e30148cSDavid Howells extern struct key *request_key_and_link(struct key_type *type, 1573e30148cSDavid Howells const char *description, 1584a38e122SDavid Howells const void *callout_info, 1594a38e122SDavid Howells size_t callout_len, 1604e54f085SDavid Howells void *aux, 1617e047ef5SDavid Howells struct key *dest_keyring, 1627e047ef5SDavid Howells unsigned long flags); 1633e30148cSDavid Howells 1640c903ab6SDavid Howells extern bool lookup_user_key_possessed(const struct key *key, 16546291959SDavid Howells const struct key_match_data *match_data); 1665593122eSDavid Howells #define KEY_LOOKUP_CREATE 0x01 1675593122eSDavid Howells #define KEY_LOOKUP_PARTIAL 0x02 1685593122eSDavid Howells #define KEY_LOOKUP_FOR_UNLINK 0x04 169e9e349b0SDavid Howells 170e9e349b0SDavid Howells extern long join_session_keyring(const char *name); 17167d12145SAl Viro extern void key_change_session_keyring(struct callback_head *twork); 172e9e349b0SDavid Howells 1730c061b57SDavid Howells extern struct work_struct key_gc_work; 1745d135440SDavid Howells extern unsigned key_gc_delay; 175074d5898SBaolin Wang extern void keyring_gc(struct key *keyring, time64_t limit); 1762b6aa412SMat Martineau extern void keyring_restriction_gc(struct key *keyring, 1772b6aa412SMat Martineau struct key_type *dead_type); 178074d5898SBaolin Wang extern void key_schedule_gc(time64_t gc_at); 179fd75815fSDavid Howells extern void key_schedule_gc_links(void); 1800c061b57SDavid Howells extern void key_gc_keytype(struct key_type *ktype); 1815d135440SDavid Howells 182e9e349b0SDavid Howells extern int key_task_permission(const key_ref_t key_ref, 183d84f4f99SDavid Howells const struct cred *cred, 184e9e349b0SDavid Howells key_perm_t perm); 185e9e349b0SDavid Howells 186973c9f4fSDavid Howells /* 187973c9f4fSDavid Howells * Check to see whether permission is granted to use a key in the desired way. 188973c9f4fSDavid Howells */ 189f5895943SDavid Howells static inline int key_permission(const key_ref_t key_ref, unsigned perm) 190e9e349b0SDavid Howells { 191d84f4f99SDavid Howells return key_task_permission(key_ref, current_cred(), perm); 192e9e349b0SDavid Howells } 193e9e349b0SDavid Howells 1943e30148cSDavid Howells extern struct key_type key_type_request_key_auth; 1953e30148cSDavid Howells extern struct key *request_key_auth_new(struct key *target, 196822ad64dSDavid Howells const char *op, 1974a38e122SDavid Howells const void *callout_info, 1988bbf4976SDavid Howells size_t callout_len, 1998bbf4976SDavid Howells struct key *dest_keyring); 2003e30148cSDavid Howells 2013e30148cSDavid Howells extern struct key *key_get_instantiation_authkey(key_serial_t target_id); 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* 204fd75815fSDavid Howells * Determine whether a key is dead. 205fd75815fSDavid Howells */ 206074d5898SBaolin Wang static inline bool key_is_dead(const struct key *key, time64_t limit) 207fd75815fSDavid Howells { 208fd75815fSDavid Howells return 209fd75815fSDavid Howells key->flags & ((1 << KEY_FLAG_DEAD) | 210fd75815fSDavid Howells (1 << KEY_FLAG_INVALIDATED)) || 211fd75815fSDavid Howells (key->expiry > 0 && key->expiry <= limit); 212fd75815fSDavid Howells } 213fd75815fSDavid Howells 214fd75815fSDavid Howells /* 215973c9f4fSDavid Howells * keyctl() functions 2161da177e4SLinus Torvalds */ 2171da177e4SLinus Torvalds extern long keyctl_get_keyring_ID(key_serial_t, int); 2181da177e4SLinus Torvalds extern long keyctl_join_session_keyring(const char __user *); 2191da177e4SLinus Torvalds extern long keyctl_update_key(key_serial_t, const void __user *, size_t); 2201da177e4SLinus Torvalds extern long keyctl_revoke_key(key_serial_t); 2211da177e4SLinus Torvalds extern long keyctl_keyring_clear(key_serial_t); 2221da177e4SLinus Torvalds extern long keyctl_keyring_link(key_serial_t, key_serial_t); 223ed0ac5c7SDavid Howells extern long keyctl_keyring_move(key_serial_t, key_serial_t, key_serial_t, unsigned int); 2241da177e4SLinus Torvalds extern long keyctl_keyring_unlink(key_serial_t, key_serial_t); 2251da177e4SLinus Torvalds extern long keyctl_describe_key(key_serial_t, char __user *, size_t); 2261da177e4SLinus Torvalds extern long keyctl_keyring_search(key_serial_t, const char __user *, 2271da177e4SLinus Torvalds const char __user *, key_serial_t); 2281da177e4SLinus Torvalds extern long keyctl_read_key(key_serial_t, char __user *, size_t); 2291da177e4SLinus Torvalds extern long keyctl_chown_key(key_serial_t, uid_t, gid_t); 2301da177e4SLinus Torvalds extern long keyctl_setperm_key(key_serial_t, key_perm_t); 2311da177e4SLinus Torvalds extern long keyctl_instantiate_key(key_serial_t, const void __user *, 2321da177e4SLinus Torvalds size_t, key_serial_t); 2331da177e4SLinus Torvalds extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t); 2343e30148cSDavid Howells extern long keyctl_set_reqkey_keyring(int); 235017679c4SDavid Howells extern long keyctl_set_timeout(key_serial_t, unsigned); 236b5f545c8SDavid Howells extern long keyctl_assume_authority(key_serial_t); 23770a5bb72SDavid Howells extern long keyctl_get_security(key_serial_t keyid, char __user *buffer, 23870a5bb72SDavid Howells size_t buflen); 239ee18d64cSDavid Howells extern long keyctl_session_to_parent(void); 240fdd1b945SDavid Howells extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t); 241ee009e4aSDavid Howells extern long keyctl_instantiate_key_iov(key_serial_t, 242ee009e4aSDavid Howells const struct iovec __user *, 243ee009e4aSDavid Howells unsigned, key_serial_t); 244fd75815fSDavid Howells extern long keyctl_invalidate_key(key_serial_t); 245ee009e4aSDavid Howells 246b353a1f7SAl Viro struct iov_iter; 247ee009e4aSDavid Howells extern long keyctl_instantiate_key_common(key_serial_t, 248b353a1f7SAl Viro struct iov_iter *, 249b353a1f7SAl Viro key_serial_t); 2506563c91fSMat Martineau extern long keyctl_restrict_keyring(key_serial_t id, 2516563c91fSMat Martineau const char __user *_type, 2526563c91fSMat Martineau const char __user *_restriction); 253f36f8c75SDavid Howells #ifdef CONFIG_PERSISTENT_KEYRINGS 254f36f8c75SDavid Howells extern long keyctl_get_persistent(uid_t, key_serial_t); 255f36f8c75SDavid Howells extern unsigned persistent_keyring_expiry; 256f36f8c75SDavid Howells #else 257f36f8c75SDavid Howells static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring) 258f36f8c75SDavid Howells { 259f36f8c75SDavid Howells return -EOPNOTSUPP; 260f36f8c75SDavid Howells } 261f36f8c75SDavid Howells #endif 2621da177e4SLinus Torvalds 263ddbb4114SMat Martineau #ifdef CONFIG_KEY_DH_OPERATIONS 264ddbb4114SMat Martineau extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *, 265f1c316a3SStephan Mueller size_t, struct keyctl_kdf_params __user *); 266f1c316a3SStephan Mueller extern long __keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *, 267f1c316a3SStephan Mueller size_t, struct keyctl_kdf_params *); 268f1c316a3SStephan Mueller #ifdef CONFIG_KEYS_COMPAT 269f1c316a3SStephan Mueller extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params, 270f1c316a3SStephan Mueller char __user *buffer, size_t buflen, 271f1c316a3SStephan Mueller struct compat_keyctl_kdf_params __user *kdf); 272f1c316a3SStephan Mueller #endif 273f1c316a3SStephan Mueller #define KEYCTL_KDF_MAX_OUTPUT_LEN 1024 /* max length of KDF output */ 274f1c316a3SStephan Mueller #define KEYCTL_KDF_MAX_OI_LEN 64 /* max length of otherinfo */ 275ddbb4114SMat Martineau #else 276ddbb4114SMat Martineau static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params, 2774693fc73SStephan Mueller char __user *buffer, size_t buflen, 278f1c316a3SStephan Mueller struct keyctl_kdf_params __user *kdf) 279ddbb4114SMat Martineau { 280ddbb4114SMat Martineau return -EOPNOTSUPP; 281ddbb4114SMat Martineau } 282f1c316a3SStephan Mueller 283f1c316a3SStephan Mueller #ifdef CONFIG_KEYS_COMPAT 284f1c316a3SStephan Mueller static inline long compat_keyctl_dh_compute( 285f1c316a3SStephan Mueller struct keyctl_dh_params __user *params, 286f1c316a3SStephan Mueller char __user *buffer, size_t buflen, 287f1c316a3SStephan Mueller struct keyctl_kdf_params __user *kdf) 288f1c316a3SStephan Mueller { 289f1c316a3SStephan Mueller return -EOPNOTSUPP; 290f1c316a3SStephan Mueller } 291f1c316a3SStephan Mueller #endif 292ddbb4114SMat Martineau #endif 293ddbb4114SMat Martineau 29400d60fd3SDavid Howells #ifdef CONFIG_ASYMMETRIC_KEY_TYPE 29500d60fd3SDavid Howells extern long keyctl_pkey_query(key_serial_t, 29600d60fd3SDavid Howells const char __user *, 29700d60fd3SDavid Howells struct keyctl_pkey_query __user *); 29800d60fd3SDavid Howells 29900d60fd3SDavid Howells extern long keyctl_pkey_verify(const struct keyctl_pkey_params __user *, 30000d60fd3SDavid Howells const char __user *, 30100d60fd3SDavid Howells const void __user *, const void __user *); 30200d60fd3SDavid Howells 30300d60fd3SDavid Howells extern long keyctl_pkey_e_d_s(int, 30400d60fd3SDavid Howells const struct keyctl_pkey_params __user *, 30500d60fd3SDavid Howells const char __user *, 30600d60fd3SDavid Howells const void __user *, void __user *); 30700d60fd3SDavid Howells #else 30800d60fd3SDavid Howells static inline long keyctl_pkey_query(key_serial_t id, 30900d60fd3SDavid Howells const char __user *_info, 31000d60fd3SDavid Howells struct keyctl_pkey_query __user *_res) 31100d60fd3SDavid Howells { 31200d60fd3SDavid Howells return -EOPNOTSUPP; 31300d60fd3SDavid Howells } 31400d60fd3SDavid Howells 31500d60fd3SDavid Howells static inline long keyctl_pkey_verify(const struct keyctl_pkey_params __user *params, 31600d60fd3SDavid Howells const char __user *_info, 31700d60fd3SDavid Howells const void __user *_in, 31800d60fd3SDavid Howells const void __user *_in2) 31900d60fd3SDavid Howells { 32000d60fd3SDavid Howells return -EOPNOTSUPP; 32100d60fd3SDavid Howells } 32200d60fd3SDavid Howells 32300d60fd3SDavid Howells static inline long keyctl_pkey_e_d_s(int op, 32400d60fd3SDavid Howells const struct keyctl_pkey_params __user *params, 32500d60fd3SDavid Howells const char __user *_info, 32600d60fd3SDavid Howells const void __user *_in, 32700d60fd3SDavid Howells void __user *_out) 32800d60fd3SDavid Howells { 32900d60fd3SDavid Howells return -EOPNOTSUPP; 33000d60fd3SDavid Howells } 33100d60fd3SDavid Howells #endif 33200d60fd3SDavid Howells 33345e0f30cSDavid Howells extern long keyctl_capabilities(unsigned char __user *_buffer, size_t buflen); 33445e0f30cSDavid Howells 3351da177e4SLinus Torvalds /* 336973c9f4fSDavid Howells * Debugging key validation 3371da177e4SLinus Torvalds */ 3381da177e4SLinus Torvalds #ifdef KEY_DEBUGGING 3391da177e4SLinus Torvalds extern void __key_check(const struct key *); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds static inline void key_check(const struct key *key) 3421da177e4SLinus Torvalds { 3431da177e4SLinus Torvalds if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC)) 3441da177e4SLinus Torvalds __key_check(key); 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds #else 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds #define key_check(key) do {} while(0) 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds #endif 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds #endif /* _INTERNAL_H */ 354