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/* SPDX-License-Identifier: GPL-2.0 */ /* * linux/include/linux/lockd/lockd.h * * General-purpose lockd include file. * * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de> */ #ifndef LINUX_LOCKD_LOCKD_H #define LINUX_LOCKD_LOCKD_H #ifdef __KERNEL__ #include <linux/in.h> #include <linux/in6.h> #include <net/ipv6.h> #include <linux/fs.h> #include <linux/kref.h> #include <linux/refcount.h> #include <linux/utsname.h> #include <linux/lockd/bind.h> #include <linux/lockd/xdr.h> #ifdef CONFIG_LOCKD_V4 #include <linux/lockd/xdr4.h> #endif #include <linux/lockd/debug.h> #include <linux/sunrpc/svc.h> /* * Version string */ #define LOCKD_VERSION "0.5" /* * Default timeout for RPC calls (seconds) */ #define LOCKD_DFLT_TIMEO 10 /* * Lockd host handle (used both by the client and server personality). */ struct nlm_host { struct hlist_node h_hash; /* doubly linked list */ struct sockaddr_storage h_addr; /* peer address */ size_t h_addrlen; struct sockaddr_storage h_srcaddr; /* our address (optional) */ size_t h_srcaddrlen; struct rpc_clnt *h_rpcclnt; /* RPC client to talk to peer */ char *h_name; /* remote hostname */ u32 h_version; /* interface version */ unsigned short h_proto; /* transport proto */ unsigned short h_reclaiming : 1, h_server : 1, /* server side, not client side */ h_noresvport : 1, h_inuse : 1; wait_queue_head_t h_gracewait; /* wait while reclaiming */ struct rw_semaphore h_rwsem; /* Reboot recovery lock */ u32 h_state; /* pseudo-state counter */ u32 h_nsmstate; /* true remote NSM state */ u32 h_pidcount; /* Pseudopids */ refcount_t h_count; /* reference count */ struct mutex h_mutex; /* mutex for pmap binding */ unsigned long h_nextrebind; /* next portmap call */ unsigned long h_expires; /* eligible for GC */ struct list_head h_lockowners; /* Lockowners for the client */ spinlock_t h_lock; struct list_head h_granted; /* Locks in GRANTED state */ struct list_head h_reclaim; /* Locks in RECLAIM state */ struct nsm_handle *h_nsmhandle; /* NSM status handle */ char *h_addrbuf; /* address eyecatcher */ struct net *net; /* host net */ const struct cred *h_cred; char nodename[UNX_MAXNODENAME + 1]; const struct nlmclnt_operations *h_nlmclnt_ops; /* Callback ops for NLM users */ }; /* * The largest string sm_addrbuf should hold is a full-size IPv6 address * (no "::" anywhere) with a scope ID. The buffer size is computed to * hold eight groups of colon-separated four-hex-digit numbers, a * percent sign, a scope id (at most 32 bits, in decimal), and NUL. */ #define NSM_ADDRBUF ((8 * 4 + 7) + (1 + 10) + 1) struct nsm_handle { struct list_head sm_link; refcount_t sm_count; char *sm_mon_name; char *sm_name; struct sockaddr_storage sm_addr; size_t sm_addrlen; unsigned int sm_monitored : 1, sm_sticky : 1; /* don't unmonitor */ struct nsm_private sm_priv; char sm_addrbuf[NSM_ADDRBUF]; }; /* * Rigorous type checking on sockaddr type conversions */ static inline struct sockaddr_in *nlm_addr_in(const struct nlm_host *host) { return (struct sockaddr_in *)&host->h_addr; } static inline struct sockaddr *nlm_addr(const struct nlm_host *host) { return (struct sockaddr *)&host->h_addr; } static inline struct sockaddr_in *nlm_srcaddr_in(const struct nlm_host *host) { return (struct sockaddr_in *)&host->h_srcaddr; } static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host) { return (struct sockaddr *)&host->h_srcaddr; } /* * Map an fl_owner_t into a unique 32-bit "pid" */ struct nlm_lockowner { struct list_head list; refcount_t count; struct nlm_host *host; fl_owner_t owner; uint32_t pid; }; struct nlm_wait; /* * Memory chunk for NLM client RPC request. */ #define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u) struct nlm_rqst { refcount_t a_count; unsigned int a_flags; /* initial RPC task flags */ struct nlm_host * a_host; /* host handle */ struct nlm_args a_args; /* arguments */ struct nlm_res a_res; /* result */ struct nlm_block * a_block; unsigned int a_retries; /* Retry count */ u8 a_owner[NLMCLNT_OHSIZE]; void * a_callback_data; /* sent to nlmclnt_operations callbacks */ }; /* * This struct describes a file held open by lockd on behalf of * an NFS client. */ struct nlm_file { struct hlist_node f_list; /* linked list */ struct nfs_fh f_handle; /* NFS file handle */ struct file * f_file; /* VFS file pointer */ struct nlm_share * f_shares; /* DOS shares */ struct list_head f_blocks; /* blocked locks */ unsigned int f_locks; /* guesstimate # of locks */ unsigned int f_count; /* reference count */ struct mutex f_mutex; /* avoid concurrent access */ }; /* * This is a server block (i.e. a lock requested by some client which * couldn't be granted because of a conflicting lock). */ #define NLM_NEVER (~(unsigned long) 0) /* timeout on non-blocking call: */ #define NLM_TIMEOUT (7 * HZ) struct nlm_block { struct kref b_count; /* Reference count */ struct list_head b_list; /* linked list of all blocks */ struct list_head b_flist; /* linked list (per file) */ struct nlm_rqst * b_call; /* RPC args & callback info */ struct svc_serv * b_daemon; /* NLM service */ struct nlm_host * b_host; /* host handle for RPC clnt */ unsigned long b_when; /* next re-xmit */ unsigned int b_id; /* block id */ unsigned char b_granted; /* VFS granted lock */ struct nlm_file * b_file; /* file in question */ struct cache_req * b_cache_req; /* deferred request handling */ struct cache_deferred_req * b_deferred_req; unsigned int b_flags; /* block flags */ #define B_QUEUED 1 /* lock queued */ #define B_GOT_CALLBACK 2 /* got lock or conflicting lock */ #define B_TIMED_OUT 4 /* filesystem too slow to respond */ }; /* * Global variables */ extern const struct rpc_program nlm_program; extern const struct svc_procedure nlmsvc_procedures[]; #ifdef CONFIG_LOCKD_V4 extern const struct svc_procedure nlmsvc_procedures4[]; #endif extern int nlmsvc_grace_period; extern unsigned long nlmsvc_timeout; extern bool nsm_use_hostnames; extern u32 nsm_local_state; /* * Lockd client functions */ struct nlm_rqst * nlm_alloc_call(struct nlm_host *host); int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *); int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *); void nlmclnt_release_call(struct nlm_rqst *); struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl); void nlmclnt_finish_block(struct nlm_wait *block); int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout); __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock); void nlmclnt_recovery(struct nlm_host *); int nlmclnt_reclaim(struct nlm_host *, struct file_lock *, struct nlm_rqst *); void nlmclnt_next_cookie(struct nlm_cookie *); /* * Host cache */ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, const size_t salen, const unsigned short protocol, const u32 version, const char *hostname, int noresvport, struct net *net, const struct cred *cred); void nlmclnt_release_host(struct nlm_host *); struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp, const char *hostname, const size_t hostname_len); void nlmsvc_release_host(struct nlm_host *); struct rpc_clnt * nlm_bind_host(struct nlm_host *); void nlm_rebind_host(struct nlm_host *); struct nlm_host * nlm_get_host(struct nlm_host *); void nlm_shutdown_hosts(void); void nlm_shutdown_hosts_net(struct net *net); void nlm_host_rebooted(const struct net *net, const struct nlm_reboot *); /* * Host monitoring */ int nsm_monitor(const struct nlm_host *host); void nsm_unmonitor(const struct nlm_host *host); struct nsm_handle *nsm_get_handle(const struct net *net, const struct sockaddr *sap, const size_t salen, const char *hostname, const size_t hostname_len); struct nsm_handle *nsm_reboot_lookup(const struct net *net, const struct nlm_reboot *info); void nsm_release(struct nsm_handle *nsm); /* * This is used in garbage collection and resource reclaim * A return value != 0 means destroy the lock/block/share */ typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref); /* * Server-side lock handling */ __be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *, struct nlm_host *, struct nlm_lock *, int, struct nlm_cookie *, int); __be32 nlmsvc_unlock(struct net *net, struct nlm_file *, struct nlm_lock *); __be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *, struct nlm_host *, struct nlm_lock *, struct nlm_lock *, struct nlm_cookie *); __be32 nlmsvc_cancel_blocked(struct net *net, struct nlm_file *, struct nlm_lock *); unsigned long nlmsvc_retry_blocked(void); void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *, nlm_host_match_fn_t match); void nlmsvc_grant_reply(struct nlm_cookie *, __be32); void nlmsvc_release_call(struct nlm_rqst *); void nlmsvc_locks_init_private(struct file_lock *, struct nlm_host *, pid_t); /* * File handling for the server personality */ __be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **, struct nfs_fh *); void nlm_release_file(struct nlm_file *); void nlmsvc_release_lockowner(struct nlm_lock *); void nlmsvc_mark_resources(struct net *); void nlmsvc_free_host_resources(struct nlm_host *); void nlmsvc_invalidate_all(void); /* * Cluster failover support */ int nlmsvc_unlock_all_by_sb(struct super_block *sb); int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr); static inline struct inode *nlmsvc_file_inode(struct nlm_file *file) { return locks_inode(file->f_file); } static inline int __nlm_privileged_request4(const struct sockaddr *sap) { const struct sockaddr_in *sin = (struct sockaddr_in *)sap; if (ntohs(sin->sin_port) > 1023) return 0; return ipv4_is_loopback(sin->sin_addr.s_addr); } #if IS_ENABLED(CONFIG_IPV6) static inline int __nlm_privileged_request6(const struct sockaddr *sap) { const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; if (ntohs(sin6->sin6_port) > 1023) return 0; if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED) return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]); return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK; } #else /* IS_ENABLED(CONFIG_IPV6) */ static inline int __nlm_privileged_request6(const struct sockaddr *sap) { return 0; } #endif /* IS_ENABLED(CONFIG_IPV6) */ /* * Ensure incoming requests are from local privileged callers. * * Return TRUE if sender is local and is connecting via a privileged port; * otherwise return FALSE. */ static inline int nlm_privileged_requester(const struct svc_rqst *rqstp) { const struct sockaddr *sap = svc_addr(rqstp); switch (sap->sa_family) { case AF_INET: return __nlm_privileged_request4(sap); case AF_INET6: return __nlm_privileged_request6(sap); default: return 0; } } /* * Compare two NLM locks. * When the second lock is of type F_UNLCK, this acts like a wildcard. */ static inline int nlm_compare_locks(const struct file_lock *fl1, const struct file_lock *fl2) { return locks_inode(fl1->fl_file) == locks_inode(fl2->fl_file) && fl1->fl_pid == fl2->fl_pid && fl1->fl_owner == fl2->fl_owner && fl1->fl_start == fl2->fl_start && fl1->fl_end == fl2->fl_end &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK); } extern const struct lock_manager_operations nlmsvc_lock_operations; #endif /* __KERNEL__ */ #endif /* LINUX_LOCKD_LOCKD_H */
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