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linux-next/include/linux/lockd/lockd.h
Chuck Lever 0cb2659b81 NLM: allow lockd requests from an unprivileged port
If the admin has specified the "noresvport" option for an NFS mount
point, the kernel's NFS client uses an unprivileged source port for
the main NFS transport.  The kernel's lockd client should use an
unprivileged port in this case as well.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2008-12-23 15:21:38 -05:00

377 lines
11 KiB
C

/*
* 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/utsname.h>
#include <linux/nfsd/nfsfh.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>
/*
* 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) */
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 */
atomic_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[48], /* address eyecatchers */
h_srcaddrbuf[48];
};
struct nsm_handle {
struct list_head sm_link;
atomic_t sm_count;
char * sm_name;
struct sockaddr_storage sm_addr;
size_t sm_addrlen;
unsigned int sm_monitored : 1,
sm_sticky : 1; /* don't unmonitor */
char sm_addrbuf[48]; /* address eyecatcher */
};
/*
* 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;
}
static inline struct sockaddr_in *nsm_addr_in(const struct nsm_handle *handle)
{
return (struct sockaddr_in *)&handle->sm_addr;
}
static inline struct sockaddr *nsm_addr(const struct nsm_handle *handle)
{
return (struct sockaddr *)&handle->sm_addr;
}
/*
* Map an fl_owner_t into a unique 32-bit "pid"
*/
struct nlm_lockowner {
struct list_head list;
atomic_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 {
atomic_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];
};
/*
* 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 file_lock * b_fl; /* set for GETLK */
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 struct rpc_program nlm_program;
extern struct svc_procedure nlmsvc_procedures[];
#ifdef CONFIG_LOCKD_V4
extern struct svc_procedure nlmsvc_procedures4[];
#endif
extern int nlmsvc_grace_period;
extern unsigned long nlmsvc_timeout;
extern int nsm_use_hostnames;
/*
* Lockd client functions
*/
struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
void nlm_release_call(struct nlm_rqst *);
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 *);
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 *);
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 nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
const char *hostname,
const size_t hostname_len);
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_release_host(struct nlm_host *);
void nlm_shutdown_hosts(void);
extern void nlm_host_rebooted(const struct sockaddr_in *, const char *,
unsigned int, u32);
void nsm_release(struct nsm_handle *);
/*
* 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 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 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);
/*
* 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_mark_resources(void);
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 file->f_file->f_path.dentry->d_inode;
}
static inline int __nlm_privileged_request4(const struct sockaddr *sap)
{
const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
return (sin->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) &&
(ntohs(sin->sin_port) < 1024);
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static inline int __nlm_privileged_request6(const struct sockaddr *sap)
{
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
return (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK) &&
(ntohs(sin6->sin6_port) < 1024);
}
#else /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
static inline int __nlm_privileged_request6(const struct sockaddr *sap)
{
return 0;
}
#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
/*
* 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;
}
}
static inline int __nlm_cmp_addr4(const struct sockaddr *sap1,
const struct sockaddr *sap2)
{
const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sap1;
const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sap2;
return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
}
static inline int __nlm_cmp_addr6(const struct sockaddr *sap1,
const struct sockaddr *sap2)
{
const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sap1;
const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sap2;
return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr);
}
/*
* Compare two host addresses
*
* Return TRUE if the addresses are the same; otherwise FALSE.
*/
static inline int nlm_cmp_addr(const struct sockaddr *sap1,
const struct sockaddr *sap2)
{
if (sap1->sa_family == sap2->sa_family) {
switch (sap1->sa_family) {
case AF_INET:
return __nlm_cmp_addr4(sap1, sap2);
case AF_INET6:
return __nlm_cmp_addr6(sap1, sap2);
}
}
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 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 struct lock_manager_operations nlmsvc_lock_operations;
#endif /* __KERNEL__ */
#endif /* LINUX_LOCKD_LOCKD_H */