2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* linux/fs/lockd/mon.c
|
|
|
|
*
|
|
|
|
* The kernel statd client.
|
|
|
|
*
|
|
|
|
* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/utsname.h>
|
|
|
|
#include <linux/kernel.h>
|
NSM: Replace IP address as our nlm_reboot lookup key
NLM provides file locking services for NFS files. Part of this service
includes a second protocol, known as NSM, which is a reboot
notification service. NLM uses this service to determine when to
reclaim locks or enter a grace period after a client or server reboots.
The NLM service (implemented by lockd in the Linux kernel) contacts
the local NSM service (implemented by rpc.statd in Linux user space)
via NSM protocol upcalls to register a callback when a particular
remote peer reboots.
To match the callback to the correct remote peer, the NLM service
constructs a cookie that it passes in the request. The NSM service
passes that cookie back to the NLM service when it is notified that
the given remote peer has indeed rebooted.
Currently on Linux, the cookie is the raw 32-bit IPv4 address of the
remote peer. To support IPv6 addresses, which are larger, we could
use all 16 bytes of the cookie to represent a full IPv6 address,
although we still can't represent an IPv6 address with a scope ID in
just 16 bytes.
Instead, to avoid the need for future changes to support additional
address types, we'll use a manufactured value for the cookie, and use
that to find the corresponding nsm_handle struct in the kernel during
the NLMPROC_SM_NOTIFY callback.
This should provide complete support in the kernel's NSM
implementation for IPv6 hosts, while remaining backwards compatible
with older rpc.statd implementations.
Note we also deal with another case where nsm_use_hostnames can change
while there are outstanding notifications, possibly resulting in the
loss of reboot notifications. After this patch, the priv cookie is
always used to lookup rebooted hosts in the kernel.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2008-12-12 06:56:07 +08:00
|
|
|
#include <linux/ktime.h>
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/sunrpc/clnt.h>
|
2007-09-11 01:48:23 +08:00
|
|
|
#include <linux/sunrpc/xprtsock.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/sunrpc/svc.h>
|
|
|
|
#include <linux/lockd/lockd.h>
|
|
|
|
|
|
|
|
#define NLMDBG_FACILITY NLMDBG_MONITOR
|
2008-12-06 08:02:07 +08:00
|
|
|
#define NSM_PROGRAM 100024
|
|
|
|
#define NSM_VERSION 1
|
|
|
|
|
|
|
|
enum {
|
|
|
|
NSMPROC_NULL,
|
|
|
|
NSMPROC_STAT,
|
|
|
|
NSMPROC_MON,
|
|
|
|
NSMPROC_UNMON,
|
|
|
|
NSMPROC_UNMON_ALL,
|
|
|
|
NSMPROC_SIMU_CRASH,
|
|
|
|
NSMPROC_NOTIFY,
|
|
|
|
};
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-12-06 08:01:59 +08:00
|
|
|
struct nsm_args {
|
2008-12-06 08:03:24 +08:00
|
|
|
struct nsm_private *priv;
|
2008-12-06 08:01:59 +08:00
|
|
|
u32 prog; /* RPC callback info */
|
|
|
|
u32 vers;
|
|
|
|
u32 proc;
|
|
|
|
|
|
|
|
char *mon_name;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct nsm_res {
|
|
|
|
u32 status;
|
|
|
|
u32 state;
|
|
|
|
};
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static struct rpc_clnt * nsm_create(void);
|
|
|
|
|
|
|
|
static struct rpc_program nsm_program;
|
2008-12-06 08:02:45 +08:00
|
|
|
static LIST_HEAD(nsm_handles);
|
|
|
|
static DEFINE_SPINLOCK(nsm_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Local NSM state
|
|
|
|
*/
|
2006-10-04 17:16:03 +08:00
|
|
|
int nsm_local_state;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-12-06 08:02:45 +08:00
|
|
|
static void nsm_display_ipv4_address(const struct sockaddr *sap, char *buf,
|
|
|
|
const size_t len)
|
|
|
|
{
|
|
|
|
const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
|
|
|
|
snprintf(buf, len, "%pI4", &sin->sin_addr.s_addr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nsm_display_ipv6_address(const struct sockaddr *sap, char *buf,
|
|
|
|
const size_t len)
|
|
|
|
{
|
|
|
|
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
|
|
|
|
|
|
|
|
if (ipv6_addr_v4mapped(&sin6->sin6_addr))
|
|
|
|
snprintf(buf, len, "%pI4", &sin6->sin6_addr.s6_addr32[3]);
|
|
|
|
else if (sin6->sin6_scope_id != 0)
|
|
|
|
snprintf(buf, len, "%pI6%%%u", &sin6->sin6_addr,
|
|
|
|
sin6->sin6_scope_id);
|
|
|
|
else
|
|
|
|
snprintf(buf, len, "%pI6", &sin6->sin6_addr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nsm_display_address(const struct sockaddr *sap,
|
|
|
|
char *buf, const size_t len)
|
|
|
|
{
|
|
|
|
switch (sap->sa_family) {
|
|
|
|
case AF_INET:
|
|
|
|
nsm_display_ipv4_address(sap, buf, len);
|
|
|
|
break;
|
|
|
|
case AF_INET6:
|
|
|
|
nsm_display_ipv6_address(sap, buf, len);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
snprintf(buf, len, "unsupported address family");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
2008-12-06 08:02:07 +08:00
|
|
|
* Common procedure for NSMPROC_MON/NSMPROC_UNMON calls
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
|
|
|
static int
|
2006-10-04 17:15:56 +08:00
|
|
|
nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
struct rpc_clnt *clnt;
|
|
|
|
int status;
|
2008-12-05 03:20:23 +08:00
|
|
|
struct nsm_args args = {
|
2008-12-06 08:03:24 +08:00
|
|
|
.priv = &nsm->sm_priv,
|
2008-12-05 03:20:23 +08:00
|
|
|
.prog = NLM_PROGRAM,
|
|
|
|
.vers = 3,
|
|
|
|
.proc = NLMPROC_NSM_NOTIFY,
|
NSM: Support IPv6 version of mon_name
The "mon_name" argument of the NSMPROC_MON and NSMPROC_UNMON upcalls
is a string that contains the hostname or IP address of the remote peer
to be notified when this host has rebooted. The sm-notify command uses
this identifier to contact the peer when we reboot, so it must be
either a well-qualified DNS hostname or a presentation format IP
address string.
When the "nsm_use_hostnames" sysctl is set to zero, the kernel's NSM
provides a presentation format IP address in the "mon_name" argument.
Otherwise, the "caller_name" argument from NLM requests is used,
which is usually just the DNS hostname of the peer.
To support IPv6 addresses for the mon_name argument, we use the
nsm_handle's address eye-catcher, which already contains an appropriate
presentation format address string. Using the eye-catcher string
obviates the need to use a large buffer on the stack to form the
presentation address string for the upcall.
This patch also addresses a subtle bug.
An NSMPROC_MON request and the subsequent NSMPROC_UNMON request for the
same peer are required to use the same value for the "mon_name"
argument. Otherwise, rpc.statd's NSMPROC_UNMON processing cannot
locate the database entry for that peer and remove it.
If the setting of nsm_use_hostnames is changed between the time the
kernel sends an NSMPROC_MON request and the time it sends the
NSMPROC_UNMON request for the same peer, the "mon_name" argument for
these two requests may not be the same. This is because the value of
"mon_name" is currently chosen at the moment the call is made based on
the setting of nsm_use_hostnames
To ensure both requests pass identical contents in the "mon_name"
argument, we now select which string to use for the argument in the
nsm_monitor() function. A pointer to this string is saved in the
nsm_handle so it can be used for a subsequent NSMPROC_UNMON upcall.
NB: There are other potential problems, such as how nlm_host_rebooted()
might behave if nsm_use_hostnames were changed while hosts are still
being monitored. This patch does not attempt to address those
problems.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2008-12-05 03:20:46 +08:00
|
|
|
.mon_name = nsm->sm_mon_name,
|
2008-12-05 03:20:23 +08:00
|
|
|
};
|
2006-03-21 02:44:23 +08:00
|
|
|
struct rpc_message msg = {
|
|
|
|
.rpc_argp = &args,
|
|
|
|
.rpc_resp = res,
|
|
|
|
};
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
clnt = nsm_create();
|
|
|
|
if (IS_ERR(clnt)) {
|
|
|
|
status = PTR_ERR(clnt);
|
2008-12-05 03:20:31 +08:00
|
|
|
dprintk("lockd: failed to create NSM upcall transport, "
|
|
|
|
"status=%d\n", status);
|
2005-04-17 06:20:36 +08:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
memset(res, 0, sizeof(*res));
|
|
|
|
|
2006-03-21 02:44:23 +08:00
|
|
|
msg.rpc_proc = &clnt->cl_procinfo[proc];
|
|
|
|
status = rpc_call_sync(clnt, &msg, 0);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (status < 0)
|
2008-12-05 03:20:31 +08:00
|
|
|
dprintk("lockd: NSM upcall RPC failed, status=%d\n",
|
|
|
|
status);
|
2005-04-17 06:20:36 +08:00
|
|
|
else
|
|
|
|
status = 0;
|
2007-06-10 07:49:36 +08:00
|
|
|
rpc_shutdown_client(clnt);
|
2005-04-17 06:20:36 +08:00
|
|
|
out:
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
2008-12-05 03:21:24 +08:00
|
|
|
/**
|
|
|
|
* nsm_monitor - Notify a peer in case we reboot
|
|
|
|
* @host: pointer to nlm_host of peer to notify
|
|
|
|
*
|
|
|
|
* If this peer is not already monitored, this function sends an
|
|
|
|
* upcall to the local rpc.statd to record the name/address of
|
|
|
|
* the peer to notify in case we reboot.
|
|
|
|
*
|
|
|
|
* Returns zero if the peer is monitored by the local rpc.statd;
|
|
|
|
* otherwise a negative errno value is returned.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2008-12-05 03:21:24 +08:00
|
|
|
int nsm_monitor(const struct nlm_host *host)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2006-10-04 17:15:53 +08:00
|
|
|
struct nsm_handle *nsm = host->h_nsmhandle;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct nsm_res res;
|
|
|
|
int status;
|
|
|
|
|
2008-12-05 03:20:53 +08:00
|
|
|
dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
|
2006-10-04 17:15:53 +08:00
|
|
|
|
|
|
|
if (nsm->sm_monitored)
|
2006-10-04 17:15:51 +08:00
|
|
|
return 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
NSM: Support IPv6 version of mon_name
The "mon_name" argument of the NSMPROC_MON and NSMPROC_UNMON upcalls
is a string that contains the hostname or IP address of the remote peer
to be notified when this host has rebooted. The sm-notify command uses
this identifier to contact the peer when we reboot, so it must be
either a well-qualified DNS hostname or a presentation format IP
address string.
When the "nsm_use_hostnames" sysctl is set to zero, the kernel's NSM
provides a presentation format IP address in the "mon_name" argument.
Otherwise, the "caller_name" argument from NLM requests is used,
which is usually just the DNS hostname of the peer.
To support IPv6 addresses for the mon_name argument, we use the
nsm_handle's address eye-catcher, which already contains an appropriate
presentation format address string. Using the eye-catcher string
obviates the need to use a large buffer on the stack to form the
presentation address string for the upcall.
This patch also addresses a subtle bug.
An NSMPROC_MON request and the subsequent NSMPROC_UNMON request for the
same peer are required to use the same value for the "mon_name"
argument. Otherwise, rpc.statd's NSMPROC_UNMON processing cannot
locate the database entry for that peer and remove it.
If the setting of nsm_use_hostnames is changed between the time the
kernel sends an NSMPROC_MON request and the time it sends the
NSMPROC_UNMON request for the same peer, the "mon_name" argument for
these two requests may not be the same. This is because the value of
"mon_name" is currently chosen at the moment the call is made based on
the setting of nsm_use_hostnames
To ensure both requests pass identical contents in the "mon_name"
argument, we now select which string to use for the argument in the
nsm_monitor() function. A pointer to this string is saved in the
nsm_handle so it can be used for a subsequent NSMPROC_UNMON upcall.
NB: There are other potential problems, such as how nlm_host_rebooted()
might behave if nsm_use_hostnames were changed while hosts are still
being monitored. This patch does not attempt to address those
problems.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2008-12-05 03:20:46 +08:00
|
|
|
/*
|
|
|
|
* Choose whether to record the caller_name or IP address of
|
|
|
|
* this peer in the local rpc.statd's database.
|
|
|
|
*/
|
|
|
|
nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
|
|
|
|
|
2008-12-06 08:02:07 +08:00
|
|
|
status = nsm_mon_unmon(nsm, NSMPROC_MON, &res);
|
2008-12-05 03:21:15 +08:00
|
|
|
if (res.status != 0)
|
|
|
|
status = -EIO;
|
|
|
|
if (status < 0)
|
2008-12-05 03:20:53 +08:00
|
|
|
printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
|
2005-04-17 06:20:36 +08:00
|
|
|
else
|
2006-10-04 17:15:53 +08:00
|
|
|
nsm->sm_monitored = 1;
|
2005-04-17 06:20:36 +08:00
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
2008-12-05 03:21:38 +08:00
|
|
|
/**
|
|
|
|
* nsm_unmonitor - Unregister peer notification
|
|
|
|
* @host: pointer to nlm_host of peer to stop monitoring
|
|
|
|
*
|
|
|
|
* If this peer is monitored, this function sends an upcall to
|
|
|
|
* tell the local rpc.statd not to send this peer a notification
|
|
|
|
* when we reboot.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
2008-12-05 03:21:38 +08:00
|
|
|
void nsm_unmonitor(const struct nlm_host *host)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2006-10-04 17:15:53 +08:00
|
|
|
struct nsm_handle *nsm = host->h_nsmhandle;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct nsm_res res;
|
2008-12-05 03:21:38 +08:00
|
|
|
int status;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-10-04 17:15:56 +08:00
|
|
|
if (atomic_read(&nsm->sm_count) == 1
|
|
|
|
&& nsm->sm_monitored && !nsm->sm_sticky) {
|
2008-12-05 03:20:53 +08:00
|
|
|
dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
|
2006-10-04 17:15:56 +08:00
|
|
|
|
2008-12-06 08:02:07 +08:00
|
|
|
status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res);
|
2008-12-05 03:21:46 +08:00
|
|
|
if (res.status != 0)
|
|
|
|
status = -EIO;
|
2006-10-04 17:15:51 +08:00
|
|
|
if (status < 0)
|
2006-10-04 17:15:56 +08:00
|
|
|
printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
|
2008-12-05 03:20:53 +08:00
|
|
|
nsm->sm_name);
|
2006-10-04 17:15:56 +08:00
|
|
|
else
|
|
|
|
nsm->sm_monitored = 0;
|
2006-10-04 17:15:51 +08:00
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-12-06 08:03:46 +08:00
|
|
|
static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
|
|
|
|
const size_t len)
|
|
|
|
{
|
|
|
|
struct nsm_handle *nsm;
|
|
|
|
|
|
|
|
list_for_each_entry(nsm, &nsm_handles, sm_link)
|
|
|
|
if (strlen(nsm->sm_name) == len &&
|
|
|
|
memcmp(nsm->sm_name, hostname, len) == 0)
|
|
|
|
return nsm;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2008-12-12 06:55:59 +08:00
|
|
|
static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
|
|
|
|
{
|
|
|
|
struct nsm_handle *nsm;
|
|
|
|
|
|
|
|
list_for_each_entry(nsm, &nsm_handles, sm_link)
|
|
|
|
if (nlm_cmp_addr(nsm_addr(nsm), sap))
|
|
|
|
return nsm;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2008-12-06 08:03:46 +08:00
|
|
|
static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
|
|
|
|
{
|
|
|
|
struct nsm_handle *nsm;
|
|
|
|
|
|
|
|
list_for_each_entry(nsm, &nsm_handles, sm_link)
|
|
|
|
if (memcmp(nsm->sm_priv.data, priv->data,
|
|
|
|
sizeof(priv->data)) == 0)
|
|
|
|
return nsm;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2008-12-06 08:03:16 +08:00
|
|
|
/*
|
|
|
|
* Construct a unique cookie to match this nsm_handle to this monitored
|
|
|
|
* host. It is passed to the local rpc.statd via NSMPROC_MON, and
|
|
|
|
* returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
|
|
|
|
* requests.
|
|
|
|
*
|
NSM: Replace IP address as our nlm_reboot lookup key
NLM provides file locking services for NFS files. Part of this service
includes a second protocol, known as NSM, which is a reboot
notification service. NLM uses this service to determine when to
reclaim locks or enter a grace period after a client or server reboots.
The NLM service (implemented by lockd in the Linux kernel) contacts
the local NSM service (implemented by rpc.statd in Linux user space)
via NSM protocol upcalls to register a callback when a particular
remote peer reboots.
To match the callback to the correct remote peer, the NLM service
constructs a cookie that it passes in the request. The NSM service
passes that cookie back to the NLM service when it is notified that
the given remote peer has indeed rebooted.
Currently on Linux, the cookie is the raw 32-bit IPv4 address of the
remote peer. To support IPv6 addresses, which are larger, we could
use all 16 bytes of the cookie to represent a full IPv6 address,
although we still can't represent an IPv6 address with a scope ID in
just 16 bytes.
Instead, to avoid the need for future changes to support additional
address types, we'll use a manufactured value for the cookie, and use
that to find the corresponding nsm_handle struct in the kernel during
the NLMPROC_SM_NOTIFY callback.
This should provide complete support in the kernel's NSM
implementation for IPv6 hosts, while remaining backwards compatible
with older rpc.statd implementations.
Note we also deal with another case where nsm_use_hostnames can change
while there are outstanding notifications, possibly resulting in the
loss of reboot notifications. After this patch, the priv cookie is
always used to lookup rebooted hosts in the kernel.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2008-12-12 06:56:07 +08:00
|
|
|
* The NSM protocol requires that these cookies be unique while the
|
|
|
|
* system is running. We prefer a stronger requirement of making them
|
|
|
|
* unique across reboots. If user space bugs cause a stale cookie to
|
|
|
|
* be sent to the kernel, it could cause the wrong host to lose its
|
|
|
|
* lock state if cookies were not unique across reboots.
|
|
|
|
*
|
|
|
|
* The cookies are exposed only to local user space via loopback. They
|
|
|
|
* do not appear on the physical network. If we want greater security
|
|
|
|
* for some reason, nsm_init_private() could perform a one-way hash to
|
|
|
|
* obscure the contents of the cookie.
|
2008-12-06 08:03:16 +08:00
|
|
|
*/
|
|
|
|
static void nsm_init_private(struct nsm_handle *nsm)
|
|
|
|
{
|
NSM: Replace IP address as our nlm_reboot lookup key
NLM provides file locking services for NFS files. Part of this service
includes a second protocol, known as NSM, which is a reboot
notification service. NLM uses this service to determine when to
reclaim locks or enter a grace period after a client or server reboots.
The NLM service (implemented by lockd in the Linux kernel) contacts
the local NSM service (implemented by rpc.statd in Linux user space)
via NSM protocol upcalls to register a callback when a particular
remote peer reboots.
To match the callback to the correct remote peer, the NLM service
constructs a cookie that it passes in the request. The NSM service
passes that cookie back to the NLM service when it is notified that
the given remote peer has indeed rebooted.
Currently on Linux, the cookie is the raw 32-bit IPv4 address of the
remote peer. To support IPv6 addresses, which are larger, we could
use all 16 bytes of the cookie to represent a full IPv6 address,
although we still can't represent an IPv6 address with a scope ID in
just 16 bytes.
Instead, to avoid the need for future changes to support additional
address types, we'll use a manufactured value for the cookie, and use
that to find the corresponding nsm_handle struct in the kernel during
the NLMPROC_SM_NOTIFY callback.
This should provide complete support in the kernel's NSM
implementation for IPv6 hosts, while remaining backwards compatible
with older rpc.statd implementations.
Note we also deal with another case where nsm_use_hostnames can change
while there are outstanding notifications, possibly resulting in the
loss of reboot notifications. After this patch, the priv cookie is
always used to lookup rebooted hosts in the kernel.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2008-12-12 06:56:07 +08:00
|
|
|
u64 *p = (u64 *)&nsm->sm_priv.data;
|
|
|
|
struct timespec ts;
|
|
|
|
|
|
|
|
ktime_get_ts(&ts);
|
|
|
|
*p++ = timespec_to_ns(&ts);
|
|
|
|
*p = (unsigned long)nsm;
|
2008-12-06 08:03:16 +08:00
|
|
|
}
|
|
|
|
|
2008-12-12 06:55:52 +08:00
|
|
|
static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
|
|
|
|
const size_t salen,
|
|
|
|
const char *hostname,
|
|
|
|
const size_t hostname_len)
|
|
|
|
{
|
|
|
|
struct nsm_handle *new;
|
|
|
|
|
|
|
|
new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
|
|
|
|
if (unlikely(new == NULL))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
atomic_set(&new->sm_count, 1);
|
|
|
|
new->sm_name = (char *)(new + 1);
|
|
|
|
memcpy(nsm_addr(new), sap, salen);
|
|
|
|
new->sm_addrlen = salen;
|
|
|
|
nsm_init_private(new);
|
|
|
|
nsm_display_address((const struct sockaddr *)&new->sm_addr,
|
|
|
|
new->sm_addrbuf, sizeof(new->sm_addrbuf));
|
|
|
|
memcpy(new->sm_name, hostname, hostname_len);
|
|
|
|
new->sm_name[hostname_len] = '\0';
|
|
|
|
|
|
|
|
return new;
|
|
|
|
}
|
|
|
|
|
2008-12-06 08:02:45 +08:00
|
|
|
/**
|
2008-12-06 08:04:01 +08:00
|
|
|
* nsm_get_handle - Find or create a cached nsm_handle
|
2008-12-06 08:02:45 +08:00
|
|
|
* @sap: pointer to socket address of handle to find
|
|
|
|
* @salen: length of socket address
|
|
|
|
* @hostname: pointer to C string containing hostname to find
|
|
|
|
* @hostname_len: length of C string
|
|
|
|
*
|
2008-12-06 08:04:01 +08:00
|
|
|
* Behavior is modulated by the global nsm_use_hostnames variable.
|
2008-12-06 08:02:45 +08:00
|
|
|
*
|
2008-12-06 08:04:01 +08:00
|
|
|
* Returns a cached nsm_handle after bumping its ref count, or
|
|
|
|
* returns a fresh nsm_handle if a handle that matches @sap and/or
|
|
|
|
* @hostname cannot be found in the handle cache. Returns NULL if
|
|
|
|
* an error occurs.
|
2008-12-06 08:02:45 +08:00
|
|
|
*/
|
2008-12-06 08:04:01 +08:00
|
|
|
struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
|
|
|
|
const size_t salen, const char *hostname,
|
|
|
|
const size_t hostname_len)
|
2008-12-06 08:02:45 +08:00
|
|
|
{
|
2008-12-12 06:55:59 +08:00
|
|
|
struct nsm_handle *cached, *new = NULL;
|
2008-12-06 08:02:45 +08:00
|
|
|
|
|
|
|
if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
|
|
|
|
if (printk_ratelimit()) {
|
|
|
|
printk(KERN_WARNING "Invalid hostname \"%.*s\" "
|
|
|
|
"in NFS lock request\n",
|
|
|
|
(int)hostname_len, hostname);
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
retry:
|
|
|
|
spin_lock(&nsm_lock);
|
2008-12-12 06:55:59 +08:00
|
|
|
|
|
|
|
if (nsm_use_hostnames && hostname != NULL)
|
|
|
|
cached = nsm_lookup_hostname(hostname, hostname_len);
|
|
|
|
else
|
|
|
|
cached = nsm_lookup_addr(sap);
|
|
|
|
|
|
|
|
if (cached != NULL) {
|
|
|
|
atomic_inc(&cached->sm_count);
|
|
|
|
spin_unlock(&nsm_lock);
|
|
|
|
kfree(new);
|
|
|
|
dprintk("lockd: found nsm_handle for %s (%s), "
|
|
|
|
"cnt %d\n", cached->sm_name,
|
|
|
|
cached->sm_addrbuf,
|
|
|
|
atomic_read(&cached->sm_count));
|
|
|
|
return cached;
|
2008-12-06 08:02:45 +08:00
|
|
|
}
|
2008-12-12 06:55:59 +08:00
|
|
|
|
|
|
|
if (new != NULL) {
|
|
|
|
list_add(&new->sm_link, &nsm_handles);
|
|
|
|
spin_unlock(&nsm_lock);
|
2008-12-06 08:02:53 +08:00
|
|
|
dprintk("lockd: created nsm_handle for %s (%s)\n",
|
2008-12-12 06:55:59 +08:00
|
|
|
new->sm_name, new->sm_addrbuf);
|
|
|
|
return new;
|
2008-12-06 08:02:45 +08:00
|
|
|
}
|
2008-12-12 06:55:59 +08:00
|
|
|
|
2008-12-06 08:02:45 +08:00
|
|
|
spin_unlock(&nsm_lock);
|
|
|
|
|
2008-12-12 06:55:59 +08:00
|
|
|
new = nsm_create_handle(sap, salen, hostname, hostname_len);
|
|
|
|
if (unlikely(new == NULL))
|
2008-12-06 08:02:45 +08:00
|
|
|
return NULL;
|
|
|
|
goto retry;
|
|
|
|
}
|
|
|
|
|
2008-12-06 08:03:46 +08:00
|
|
|
/**
|
|
|
|
* nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
|
|
|
|
* @info: pointer to NLMPROC_SM_NOTIFY arguments
|
|
|
|
*
|
|
|
|
* Returns a matching nsm_handle if found in the nsm cache; the returned
|
|
|
|
* nsm_handle's reference count is bumped and sm_monitored is cleared.
|
|
|
|
* Otherwise returns NULL if some error occurred.
|
|
|
|
*/
|
|
|
|
struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
|
|
|
|
{
|
|
|
|
struct nsm_handle *cached;
|
|
|
|
|
|
|
|
spin_lock(&nsm_lock);
|
|
|
|
|
NSM: Replace IP address as our nlm_reboot lookup key
NLM provides file locking services for NFS files. Part of this service
includes a second protocol, known as NSM, which is a reboot
notification service. NLM uses this service to determine when to
reclaim locks or enter a grace period after a client or server reboots.
The NLM service (implemented by lockd in the Linux kernel) contacts
the local NSM service (implemented by rpc.statd in Linux user space)
via NSM protocol upcalls to register a callback when a particular
remote peer reboots.
To match the callback to the correct remote peer, the NLM service
constructs a cookie that it passes in the request. The NSM service
passes that cookie back to the NLM service when it is notified that
the given remote peer has indeed rebooted.
Currently on Linux, the cookie is the raw 32-bit IPv4 address of the
remote peer. To support IPv6 addresses, which are larger, we could
use all 16 bytes of the cookie to represent a full IPv6 address,
although we still can't represent an IPv6 address with a scope ID in
just 16 bytes.
Instead, to avoid the need for future changes to support additional
address types, we'll use a manufactured value for the cookie, and use
that to find the corresponding nsm_handle struct in the kernel during
the NLMPROC_SM_NOTIFY callback.
This should provide complete support in the kernel's NSM
implementation for IPv6 hosts, while remaining backwards compatible
with older rpc.statd implementations.
Note we also deal with another case where nsm_use_hostnames can change
while there are outstanding notifications, possibly resulting in the
loss of reboot notifications. After this patch, the priv cookie is
always used to lookup rebooted hosts in the kernel.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2008-12-12 06:56:07 +08:00
|
|
|
cached = nsm_lookup_priv(&info->priv);
|
2008-12-06 08:03:46 +08:00
|
|
|
if (unlikely(cached == NULL)) {
|
|
|
|
spin_unlock(&nsm_lock);
|
|
|
|
dprintk("lockd: never saw rebooted peer '%.*s' before\n",
|
|
|
|
info->len, info->mon);
|
|
|
|
return cached;
|
|
|
|
}
|
|
|
|
|
|
|
|
atomic_inc(&cached->sm_count);
|
|
|
|
spin_unlock(&nsm_lock);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* During subsequent lock activity, force a fresh
|
|
|
|
* notification to be set up for this host.
|
|
|
|
*/
|
|
|
|
cached->sm_monitored = 0;
|
|
|
|
|
|
|
|
dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
|
|
|
|
cached->sm_name, cached->sm_addrbuf,
|
|
|
|
atomic_read(&cached->sm_count));
|
|
|
|
return cached;
|
|
|
|
}
|
|
|
|
|
2008-12-06 08:02:45 +08:00
|
|
|
/**
|
|
|
|
* nsm_release - Release an NSM handle
|
|
|
|
* @nsm: pointer to handle to be released
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
void nsm_release(struct nsm_handle *nsm)
|
|
|
|
{
|
|
|
|
if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
|
|
|
|
list_del(&nsm->sm_link);
|
|
|
|
spin_unlock(&nsm_lock);
|
2008-12-06 08:02:53 +08:00
|
|
|
dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
|
|
|
|
nsm->sm_name, nsm->sm_addrbuf);
|
2008-12-06 08:02:45 +08:00
|
|
|
kfree(nsm);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* Create NSM client for the local host
|
|
|
|
*/
|
|
|
|
static struct rpc_clnt *
|
|
|
|
nsm_create(void)
|
|
|
|
{
|
2006-08-23 08:06:20 +08:00
|
|
|
struct sockaddr_in sin = {
|
|
|
|
.sin_family = AF_INET,
|
|
|
|
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
|
|
|
|
.sin_port = 0,
|
|
|
|
};
|
|
|
|
struct rpc_create_args args = {
|
2007-09-11 01:48:23 +08:00
|
|
|
.protocol = XPRT_TRANSPORT_UDP,
|
2006-08-23 08:06:20 +08:00
|
|
|
.address = (struct sockaddr *)&sin,
|
|
|
|
.addrsize = sizeof(sin),
|
|
|
|
.servername = "localhost",
|
|
|
|
.program = &nsm_program,
|
2008-12-06 08:02:07 +08:00
|
|
|
.version = NSM_VERSION,
|
2006-08-23 08:06:20 +08:00
|
|
|
.authflavor = RPC_AUTH_NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
return rpc_create(&args);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* XDR functions for NSM.
|
2008-03-15 02:26:01 +08:00
|
|
|
*
|
|
|
|
* See http://www.opengroup.org/ for details on the Network
|
|
|
|
* Status Monitor wire protocol.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
|
|
|
|
2008-12-06 08:02:15 +08:00
|
|
|
static int encode_nsm_string(struct xdr_stream *xdr, const char *string)
|
2008-03-15 02:25:32 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
const u32 len = strlen(string);
|
|
|
|
__be32 *p;
|
|
|
|
|
|
|
|
if (unlikely(len > SM_MAXSTRLEN))
|
|
|
|
return -EIO;
|
|
|
|
p = xdr_reserve_space(xdr, sizeof(u32) + len);
|
|
|
|
if (unlikely(p == NULL))
|
|
|
|
return -EIO;
|
|
|
|
xdr_encode_opaque(p, string, len);
|
|
|
|
return 0;
|
2008-03-15 02:25:32 +08:00
|
|
|
}
|
|
|
|
|
2008-03-15 02:25:39 +08:00
|
|
|
/*
|
|
|
|
* "mon_name" specifies the host to be monitored.
|
|
|
|
*/
|
2008-12-06 08:02:15 +08:00
|
|
|
static int encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
|
2008-03-15 02:25:39 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
return encode_nsm_string(xdr, argp->mon_name);
|
2008-03-15 02:25:39 +08:00
|
|
|
}
|
|
|
|
|
2008-03-15 02:25:46 +08:00
|
|
|
/*
|
|
|
|
* The "my_id" argument specifies the hostname and RPC procedure
|
|
|
|
* to be called when the status manager receives notification
|
2008-12-06 08:02:07 +08:00
|
|
|
* (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
|
2008-03-15 02:25:46 +08:00
|
|
|
* has changed.
|
|
|
|
*/
|
2008-12-06 08:02:15 +08:00
|
|
|
static int encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
|
2008-03-15 02:25:46 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
int status;
|
|
|
|
__be32 *p;
|
|
|
|
|
|
|
|
status = encode_nsm_string(xdr, utsname()->nodename);
|
|
|
|
if (unlikely(status != 0))
|
|
|
|
return status;
|
|
|
|
p = xdr_reserve_space(xdr, 3 * sizeof(u32));
|
|
|
|
if (unlikely(p == NULL))
|
|
|
|
return -EIO;
|
2008-03-15 02:25:46 +08:00
|
|
|
*p++ = htonl(argp->prog);
|
|
|
|
*p++ = htonl(argp->vers);
|
|
|
|
*p++ = htonl(argp->proc);
|
2008-12-06 08:02:15 +08:00
|
|
|
return 0;
|
2008-03-15 02:25:46 +08:00
|
|
|
}
|
|
|
|
|
2008-03-15 02:25:53 +08:00
|
|
|
/*
|
|
|
|
* The "mon_id" argument specifies the non-private arguments
|
2008-12-06 08:02:07 +08:00
|
|
|
* of an NSMPROC_MON or NSMPROC_UNMON call.
|
2008-03-15 02:25:53 +08:00
|
|
|
*/
|
2008-12-06 08:02:15 +08:00
|
|
|
static int encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
|
2008-03-15 02:25:53 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
int status;
|
2008-03-15 02:25:53 +08:00
|
|
|
|
2008-12-06 08:02:15 +08:00
|
|
|
status = encode_mon_name(xdr, argp);
|
|
|
|
if (unlikely(status != 0))
|
|
|
|
return status;
|
|
|
|
return encode_my_id(xdr, argp);
|
2008-03-15 02:25:53 +08:00
|
|
|
}
|
|
|
|
|
2008-03-15 02:26:08 +08:00
|
|
|
/*
|
|
|
|
* The "priv" argument may contain private information required
|
2008-12-06 08:02:07 +08:00
|
|
|
* by the NSMPROC_MON call. This information will be supplied in the
|
|
|
|
* NLMPROC_SM_NOTIFY call.
|
2008-03-15 02:26:08 +08:00
|
|
|
*/
|
2008-12-06 08:02:15 +08:00
|
|
|
static int encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
|
2008-03-15 02:26:08 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
__be32 *p;
|
|
|
|
|
|
|
|
p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
|
|
|
|
if (unlikely(p == NULL))
|
|
|
|
return -EIO;
|
2008-12-06 08:03:24 +08:00
|
|
|
xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
|
2008-12-06 08:02:15 +08:00
|
|
|
return 0;
|
2008-03-15 02:26:08 +08:00
|
|
|
}
|
|
|
|
|
2008-12-06 08:02:15 +08:00
|
|
|
static int xdr_enc_mon(struct rpc_rqst *req, __be32 *p,
|
|
|
|
const struct nsm_args *argp)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
struct xdr_stream xdr;
|
|
|
|
int status;
|
2008-03-15 02:26:08 +08:00
|
|
|
|
2008-12-06 08:02:15 +08:00
|
|
|
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
|
|
|
|
status = encode_mon_id(&xdr, argp);
|
|
|
|
if (unlikely(status))
|
|
|
|
return status;
|
|
|
|
return encode_priv(&xdr, argp);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-12-06 08:02:15 +08:00
|
|
|
static int xdr_enc_unmon(struct rpc_rqst *req, __be32 *p,
|
|
|
|
const struct nsm_args *argp)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
struct xdr_stream xdr;
|
|
|
|
|
|
|
|
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
|
|
|
|
return encode_mon_id(&xdr, argp);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-12-06 08:02:15 +08:00
|
|
|
static int xdr_dec_stat_res(struct rpc_rqst *rqstp, __be32 *p,
|
|
|
|
struct nsm_res *resp)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
struct xdr_stream xdr;
|
|
|
|
|
|
|
|
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
|
|
|
|
p = xdr_inline_decode(&xdr, 2 * sizeof(u32));
|
|
|
|
if (unlikely(p == NULL))
|
|
|
|
return -EIO;
|
2005-04-17 06:20:36 +08:00
|
|
|
resp->status = ntohl(*p++);
|
2008-12-06 08:02:15 +08:00
|
|
|
resp->state = ntohl(*p);
|
|
|
|
|
|
|
|
dprintk("lockd: xdr_dec_stat_res status %d state %d\n",
|
2005-04-17 06:20:36 +08:00
|
|
|
resp->status, resp->state);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-12-06 08:02:15 +08:00
|
|
|
static int xdr_dec_stat(struct rpc_rqst *rqstp, __be32 *p,
|
|
|
|
struct nsm_res *resp)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-12-06 08:02:15 +08:00
|
|
|
struct xdr_stream xdr;
|
|
|
|
|
|
|
|
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
|
|
|
|
p = xdr_inline_decode(&xdr, sizeof(u32));
|
|
|
|
if (unlikely(p == NULL))
|
|
|
|
return -EIO;
|
|
|
|
resp->state = ntohl(*p);
|
|
|
|
|
|
|
|
dprintk("lockd: xdr_dec_stat state %d\n", resp->state);
|
2005-04-17 06:20:36 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
|
2008-03-15 02:26:01 +08:00
|
|
|
#define SM_my_id_sz (SM_my_name_sz+3)
|
|
|
|
#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
|
|
|
|
#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
|
2008-03-15 02:26:08 +08:00
|
|
|
#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
|
|
|
|
#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
|
2005-04-17 06:20:36 +08:00
|
|
|
#define SM_monres_sz 2
|
|
|
|
#define SM_unmonres_sz 1
|
|
|
|
|
|
|
|
static struct rpc_procinfo nsm_procedures[] = {
|
2008-12-06 08:02:07 +08:00
|
|
|
[NSMPROC_MON] = {
|
|
|
|
.p_proc = NSMPROC_MON,
|
2008-12-06 08:02:15 +08:00
|
|
|
.p_encode = (kxdrproc_t)xdr_enc_mon,
|
|
|
|
.p_decode = (kxdrproc_t)xdr_dec_stat_res,
|
2007-03-30 04:47:53 +08:00
|
|
|
.p_arglen = SM_mon_sz,
|
|
|
|
.p_replen = SM_monres_sz,
|
2008-12-06 08:02:07 +08:00
|
|
|
.p_statidx = NSMPROC_MON,
|
2006-03-21 02:44:22 +08:00
|
|
|
.p_name = "MONITOR",
|
2005-04-17 06:20:36 +08:00
|
|
|
},
|
2008-12-06 08:02:07 +08:00
|
|
|
[NSMPROC_UNMON] = {
|
|
|
|
.p_proc = NSMPROC_UNMON,
|
2008-12-06 08:02:15 +08:00
|
|
|
.p_encode = (kxdrproc_t)xdr_enc_unmon,
|
|
|
|
.p_decode = (kxdrproc_t)xdr_dec_stat,
|
2007-03-30 04:47:53 +08:00
|
|
|
.p_arglen = SM_mon_id_sz,
|
|
|
|
.p_replen = SM_unmonres_sz,
|
2008-12-06 08:02:07 +08:00
|
|
|
.p_statidx = NSMPROC_UNMON,
|
2006-03-21 02:44:22 +08:00
|
|
|
.p_name = "UNMONITOR",
|
2005-04-17 06:20:36 +08:00
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct rpc_version nsm_version1 = {
|
2006-03-24 19:15:34 +08:00
|
|
|
.number = 1,
|
|
|
|
.nrprocs = ARRAY_SIZE(nsm_procedures),
|
2005-04-17 06:20:36 +08:00
|
|
|
.procs = nsm_procedures
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct rpc_version * nsm_version[] = {
|
|
|
|
[1] = &nsm_version1,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct rpc_stat nsm_stats;
|
|
|
|
|
|
|
|
static struct rpc_program nsm_program = {
|
|
|
|
.name = "statd",
|
2008-12-06 08:02:07 +08:00
|
|
|
.number = NSM_PROGRAM,
|
2006-03-24 19:15:34 +08:00
|
|
|
.nrvers = ARRAY_SIZE(nsm_version),
|
2005-04-17 06:20:36 +08:00
|
|
|
.version = nsm_version,
|
|
|
|
.stats = &nsm_stats
|
|
|
|
};
|