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/*
* 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>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/sm_inter.h>
#define NLMDBG_FACILITY NLMDBG_MONITOR
static struct rpc_clnt * nsm_create(void);
extern struct rpc_program nsm_program;
/*
* Local NSM state
*/
u32 nsm_local_state = 0;
/*
* Common procedure for SM_MON/SM_UNMON calls
*/
static int
nsm_mon_unmon(struct nlm_host *host, char *what, u32 proc)
{
struct rpc_clnt *clnt;
struct nsm_args args;
struct nsm_res res;
int status;
dprintk("lockd: nsm_%s(%s)\n", what, host->h_name);
if (!(clnt = nsm_create()))
return -EACCES;
args.addr = host->h_addr.sin_addr.s_addr;
args.prog = NLM_PROGRAM;
args.vers = 1;
args.proc = NLMPROC_NSM_NOTIFY;
if ((status = rpc_call(clnt, proc, &args, &res, 0)) < 0)
return status;
if (res.status != 0) {
printk(KERN_NOTICE "lockd: cannot %s %s\n", what, host->h_name);
return -EACCES;
}
nsm_local_state = res.state;
return 0;
}
/*
* Set up monitoring of a remote host
*/
int
nsm_monitor(struct nlm_host *host)
{
int status;
if ((status = nsm_mon_unmon(host, "monitor", SM_MON)) >= 0)
host->h_monitored = 1;
return status;
}
/*
* Cease to monitor remote host
*/
int
nsm_unmonitor(struct nlm_host *host)
{
int status;
if ((status = nsm_mon_unmon(host, "unmonitor", SM_UNMON)) >= 0)
host->h_monitored = 0;
return status;
}
/*
* Create NSM client for the local host
*/
static struct rpc_clnt *
nsm_create(void)
{
struct sockaddr_in sin;
struct rpc_xprt *xprt;
struct rpc_clnt *clnt;
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sin.sin_port = 0;
if (!(xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL)))
return NULL;
clnt = rpc_create_client(xprt, "localhost",
&nsm_program, SM_VERSION,
RPC_AUTH_NULL);
if (!clnt) {
xprt_destroy(xprt);
} else {
clnt->cl_softrtry = 1;
clnt->cl_chatty = 1;
clnt->cl_oneshot = 1;
}
return clnt;
}
/*
* XDR functions for NSM.
*/
static int
xdr_error(struct rpc_rqst *rqstp, u32 *p, void *dummy)
{
return -EACCES;
}
static int
xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
{
char buffer[20];
u32 addr = ntohl(argp->addr);
dprintk("nsm: xdr_encode_mon(%08lx, %ld, %ld, %ld)\n",
htonl(argp->addr), htonl(argp->proc),
htonl(argp->vers), htonl(argp->proc));
/*
* Use the dotted-quad IP address of the remote host as
* identifier. Linux statd always looks up the canonical
* hostname first for whatever remote hostname it receives,
* so this works alright.
*/
sprintf(buffer, "%d.%d.%d.%d", (addr>>24) & 0xff, (addr>>16) & 0xff,
(addr>>8) & 0xff, (addr) & 0xff);
if (!(p = xdr_encode_string(p, buffer))
|| !(p = xdr_encode_string(p, system_utsname.nodename)))
return -EIO;
*p++ = htonl(argp->prog);
*p++ = htonl(argp->vers);
*p++ = htonl(argp->proc);
/* This is the private part. Needed only for SM_MON call */
if (rqstp->rq_task->tk_proc == SM_MON) {
*p++ = argp->addr;
*p++ = 0;
*p++ = 0;
*p++ = 0;
}
rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
return 0;
}
static int
xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
{
resp->status = ntohl(*p++);
resp->state = ntohl(*p++);
dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
resp->status, resp->state);
return 0;
}
static int
xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
{
resp->status = ntohl(*p++);
return 0;
}
#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
#define SM_my_id_sz (3+1+SM_my_name_sz)
#define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
#define SM_mon_sz (SM_mon_id_sz+4)
static struct rpc_procinfo nsm_procedures[] = {
{ "sm_null",
(kxdrproc_t) xdr_error,
(kxdrproc_t) xdr_error, 0, 0 },
{ "sm_stat",
(kxdrproc_t) xdr_error,
(kxdrproc_t) xdr_error, 0, 0 },
{ "sm_mon",
(kxdrproc_t) xdr_encode_mon,
(kxdrproc_t) xdr_decode_stat_res, SM_mon_sz, 2 },
{ "sm_unmon",
(kxdrproc_t) xdr_encode_mon,
(kxdrproc_t) xdr_decode_stat, SM_mon_id_sz, 1 },
{ "sm_unmon_all",
(kxdrproc_t) xdr_error,
(kxdrproc_t) xdr_error, 0, 0 },
{ "sm_simu_crash",
(kxdrproc_t) xdr_error,
(kxdrproc_t) xdr_error, 0, 0 },
{ "sm_notify",
(kxdrproc_t) xdr_error,
(kxdrproc_t) xdr_error, 0, 0 },
};
static struct rpc_version nsm_version1 = {
1,
sizeof(nsm_procedures)/sizeof(nsm_procedures[0]),
nsm_procedures
};
static struct rpc_version * nsm_version[] = {
NULL,
&nsm_version1,
};
static struct rpc_stat nsm_stats;
struct rpc_program nsm_program = {
"statd",
SM_PROGRAM,
sizeof(nsm_version)/sizeof(nsm_version[0]),
nsm_version,
&nsm_stats
};
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