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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 <[email protected]>
*/
#ifndef LINUX_LOCKD_LOCKD_H
#define LINUX_LOCKD_LOCKD_H
/* XXX: a lot of this should really be under fs/lockd. */
#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[2]; /* VFS file pointers,
indexed by O_ flags */
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
*/
int lock_to_openmode(struct file_lock *);
__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 nlm_lock *);
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[O_RDONLY] ?
file->f_file[O_RDONLY] : file->f_file[O_WRONLY]);
}
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 /* LINUX_LOCKD_LOCKD_H */
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