[net-next-2.6.git] / fs / lockd / mon.c

/*
 * 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);

static struct rpc_program	nsm_program;

/*
 * Local NSM state
 */
u32				nsm_local_state;

/*
 * Common procedure for SM_MON/SM_UNMON calls
 */
static int
nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res)
{
	struct rpc_clnt	*clnt;
	int		status;
	struct nsm_args	args;
	struct rpc_message msg = {
		.rpc_argp	= &args,
		.rpc_resp	= res,
	};

	clnt = nsm_create();
	if (IS_ERR(clnt)) {
		status = PTR_ERR(clnt);
		goto out;
	}

	args.addr = host->h_addr.sin_addr.s_addr;
	args.proto= (host->h_proto<<1) | host->h_server;
	args.prog = NLM_PROGRAM;
	args.vers = host->h_version;
	args.proc = NLMPROC_NSM_NOTIFY;
	memset(res, 0, sizeof(*res));

	msg.rpc_proc = &clnt->cl_procinfo[proc];
	status = rpc_call_sync(clnt, &msg, 0);
	if (status < 0)
		printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n",
			status);
	else
		status = 0;
 out:
	return status;
}

/*
 * Set up monitoring of a remote host
 */
int
nsm_monitor(struct nlm_host *host)
{
	struct nsm_res	res;
	int		status;

	dprintk("lockd: nsm_monitor(%s)\n", host->h_name);

	status = nsm_mon_unmon(host, SM_MON, &res);

	if (status < 0 || res.status != 0)
		printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
	else
		host->h_monitored = 1;
	return status;
}

/*
 * Cease to monitor remote host
 */
int
nsm_unmonitor(struct nlm_host *host)
{
	struct nsm_res	res;
	int		status;

	dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);

	status = nsm_mon_unmon(host, SM_UNMON, &res);
	if (status < 0)
		printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name);
	else
		host->h_monitored = 0;
	return status;
}

/*
 * Create NSM client for the local host
 */
static struct rpc_clnt *
nsm_create(void)
{
	struct rpc_xprt		*xprt;
	struct rpc_clnt		*clnt;
	struct sockaddr_in	sin;

	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	sin.sin_port = 0;

	xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL);
	if (IS_ERR(xprt))
		return (struct rpc_clnt *)xprt;
	xprt->resvport = 1;	/* NSM requires a reserved port */

	clnt = rpc_create_client(xprt, "localhost",
				&nsm_program, SM_VERSION,
				RPC_AUTH_NULL);
	if (IS_ERR(clnt))
		goto out_err;
	clnt->cl_softrtry = 1;
	clnt->cl_oneshot  = 1;
	return clnt;

out_err:
	return clnt;
}

/*
 * XDR functions for NSM.
 */

static u32 *
xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
{
	char	buffer[20];

	/*
	 * 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, "%u.%u.%u.%u", NIPQUAD(argp->addr));
	if (!(p = xdr_encode_string(p, buffer))
	 || !(p = xdr_encode_string(p, system_utsname.nodename)))
		return ERR_PTR(-EIO);
	*p++ = htonl(argp->prog);
	*p++ = htonl(argp->vers);
	*p++ = htonl(argp->proc);

	return p;
}

static int
xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
{
	p = xdr_encode_common(rqstp, p, argp);
	if (IS_ERR(p))
		return PTR_ERR(p);
	*p++ = argp->addr;
	*p++ = argp->vers;
	*p++ = argp->proto;
	*p++ = 0;
	rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
	return 0;
}

static int
xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
{
	p = xdr_encode_common(rqstp, p, argp);
	if (IS_ERR(p))
		return PTR_ERR(p);
	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->state = 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)
#define SM_monres_sz	2
#define SM_unmonres_sz	1

#ifndef MAX
# define MAX(a, b)	(((a) > (b))? (a) : (b))
#endif

static struct rpc_procinfo	nsm_procedures[] = {
[SM_MON] = {
		.p_proc		= SM_MON,
		.p_encode	= (kxdrproc_t) xdr_encode_mon,
		.p_decode	= (kxdrproc_t) xdr_decode_stat_res,
		.p_bufsiz	= MAX(SM_mon_sz, SM_monres_sz) << 2,
		.p_statidx	= SM_MON,
		.p_name		= "MONITOR",
	},
[SM_UNMON] = {
		.p_proc		= SM_UNMON,
		.p_encode	= (kxdrproc_t) xdr_encode_unmon,
		.p_decode	= (kxdrproc_t) xdr_decode_stat,
		.p_bufsiz	= MAX(SM_mon_id_sz, SM_unmonres_sz) << 2,
		.p_statidx	= SM_UNMON,
		.p_name		= "UNMONITOR",
	},
};

static struct rpc_version	nsm_version1 = {
		.number		= 1,
		.nrprocs	= ARRAY_SIZE(nsm_procedures),
		.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",
		.number		= SM_PROGRAM,
		.nrvers		= ARRAY_SIZE(nsm_version),
		.version	= nsm_version,
		.stats		= &nsm_stats
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/mon.c
	3	*
	4	* The kernel statd client.
	5	*
	6	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/utsname.h>
	11	#include <linux/kernel.h>
	12	#include <linux/sunrpc/clnt.h>
	13	#include <linux/sunrpc/svc.h>
	14	#include <linux/lockd/lockd.h>
	15	#include <linux/lockd/sm_inter.h>
	16
	17
	18	#define NLMDBG_FACILITY NLMDBG_MONITOR
	19
	20	static struct rpc_clnt * nsm_create(void);
	21
	22	static struct rpc_program nsm_program;
	23
	24	/*
	25	* Local NSM state
	26	*/
	27	u32 nsm_local_state;
	28
	29	/*
	30	* Common procedure for SM_MON/SM_UNMON calls
	31	*/
	32	static int
	33	nsm_mon_unmon(struct nlm_host host, u32 proc, struct nsm_res res)
	34	{
	35	struct rpc_clnt *clnt;
	36	int status;
	37	struct nsm_args args;
dead28da CL	38	struct rpc_message msg = {
	39	.rpc_argp = &args,
	40	.rpc_resp = res,
	41	};
1da177e4 LT	42
	43	clnt = nsm_create();
	44	if (IS_ERR(clnt)) {
	45	status = PTR_ERR(clnt);
	46	goto out;
	47	}
	48
	49	args.addr = host->h_addr.sin_addr.s_addr;
	50	args.proto= (host->h_proto<<1) \| host->h_server;
	51	args.prog = NLM_PROGRAM;
	52	args.vers = host->h_version;
	53	args.proc = NLMPROC_NSM_NOTIFY;
	54	memset(res, 0, sizeof(*res));
	55
dead28da CL	56	msg.rpc_proc = &clnt->cl_procinfo[proc];
dead28da CL	57	status = rpc_call_sync(clnt, &msg, 0);
1da177e4 LT	58	if (status < 0)
	59	printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n",
	60	status);
	61	else
	62	status = 0;
	63	out:
	64	return status;
	65	}
	66
	67	/*
	68	* Set up monitoring of a remote host
	69	*/
	70	int
	71	nsm_monitor(struct nlm_host *host)
	72	{
	73	struct nsm_res res;
	74	int status;
	75
	76	dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
	77
	78	status = nsm_mon_unmon(host, SM_MON, &res);
	79
	80	if (status < 0 \|\| res.status != 0)
	81	printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
	82	else
	83	host->h_monitored = 1;
	84	return status;
	85	}
	86
	87	/*
	88	* Cease to monitor remote host
	89	*/
	90	int
	91	nsm_unmonitor(struct nlm_host *host)
	92	{
	93	struct nsm_res res;
	94	int status;
	95
	96	dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
	97
	98	status = nsm_mon_unmon(host, SM_UNMON, &res);
	99	if (status < 0)
	100	printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name);
	101	else
	102	host->h_monitored = 0;
	103	return status;
	104	}
	105
	106	/*
	107	* Create NSM client for the local host
	108	*/
	109	static struct rpc_clnt *
	110	nsm_create(void)
	111	{
	112	struct rpc_xprt *xprt;
	113	struct rpc_clnt *clnt;
	114	struct sockaddr_in sin;
	115
	116	sin.sin_family = AF_INET;
	117	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	118	sin.sin_port = 0;
	119
	120	xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL);
	121	if (IS_ERR(xprt))
122	return (struct rpc_clnt *)xprt;
5ee0ed7d	123	xprt->resvport = 1; /* NSM requires a reserved port */
1da177e4 LT	124
	125	clnt = rpc_create_client(xprt, "localhost",
	126	&nsm_program, SM_VERSION,
	127	RPC_AUTH_NULL);
	128	if (IS_ERR(clnt))
5b616f5d	129	goto out_err;
1da177e4	130	clnt->cl_softrtry = 1;
1da177e4	131	clnt->cl_oneshot = 1;
1da177e4 LT	132	return clnt;
1da177e4 LT	133
5b616f5d	134	out_err:
1da177e4 LT	135	return clnt;
	136	}
	137
	138	/*
	139	* XDR functions for NSM.
	140	*/
	141
	142	static u32 *
	143	xdr_encode_common(struct rpc_rqst rqstp, u32 p, struct nsm_args *argp)
	144	{
	145	char buffer[20];
	146
	147	/*
	148	* Use the dotted-quad IP address of the remote host as
	149	* identifier. Linux statd always looks up the canonical
	150	* hostname first for whatever remote hostname it receives,
	151	* so this works alright.
	152	*/
	153	sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
	154	if (!(p = xdr_encode_string(p, buffer))
	155	\|\| !(p = xdr_encode_string(p, system_utsname.nodename)))
	156	return ERR_PTR(-EIO);
	157	*p++ = htonl(argp->prog);
	158	*p++ = htonl(argp->vers);
	159	*p++ = htonl(argp->proc);
	160
	161	return p;
	162	}
	163
	164	static int
	165	xdr_encode_mon(struct rpc_rqst rqstp, u32 p, struct nsm_args *argp)
	166	{
	167	p = xdr_encode_common(rqstp, p, argp);
	168	if (IS_ERR(p))
	169	return PTR_ERR(p);
	170	*p++ = argp->addr;
	171	*p++ = argp->vers;
	172	*p++ = argp->proto;
	173	*p++ = 0;
	174	rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
	175	return 0;
	176	}
	177
	178	static int
	179	xdr_encode_unmon(struct rpc_rqst rqstp, u32 p, struct nsm_args *argp)
	180	{
	181	p = xdr_encode_common(rqstp, p, argp);
	182	if (IS_ERR(p))
	183	return PTR_ERR(p);
	184	rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
	185	return 0;
	186	}
	187
	188	static int
	189	xdr_decode_stat_res(struct rpc_rqst rqstp, u32 p, struct nsm_res *resp)
	190	{
	191	resp->status = ntohl(*p++);
	192	resp->state = ntohl(*p++);
	193	dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
	194	resp->status, resp->state);
	195	return 0;
	196	}
	197
	198	static int
199	xdr_decode_stat(struct rpc_rqst rqstp, u32 p, struct nsm_res *resp)
200	{
201	resp->state = ntohl(*p++);
202	return 0;
203	}
204
205	#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
206	#define SM_my_id_sz (3+1+SM_my_name_sz)
207	#define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
208	#define SM_mon_sz (SM_mon_id_sz+4)
209	#define SM_monres_sz 2
210	#define SM_unmonres_sz 1
211
212	#ifndef MAX
213	# define MAX(a, b) (((a) > (b))? (a) : (b))
214	#endif
215
216	static struct rpc_procinfo nsm_procedures[] = {
217	[SM_MON] = {
218	.p_proc = SM_MON,
219	.p_encode = (kxdrproc_t) xdr_encode_mon,
220	.p_decode = (kxdrproc_t) xdr_decode_stat_res,
221	.p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2,
cc0175c1 CL	222	.p_statidx = SM_MON,
cc0175c1 CL	223	.p_name = "MONITOR",
1da177e4 LT	224	},
	225	[SM_UNMON] = {
	226	.p_proc = SM_UNMON,
	227	.p_encode = (kxdrproc_t) xdr_encode_unmon,
	228	.p_decode = (kxdrproc_t) xdr_decode_stat,
	229	.p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2,
cc0175c1 CL	230	.p_statidx = SM_UNMON,
cc0175c1 CL	231	.p_name = "UNMONITOR",
1da177e4 LT	232	},
	233	};
	234
	235	static struct rpc_version nsm_version1 = {
e8c96f8c TK	236	.number = 1,
e8c96f8c TK	237	.nrprocs = ARRAY_SIZE(nsm_procedures),
1da177e4 LT	238	.procs = nsm_procedures
	239	};
	240
	241	static struct rpc_version * nsm_version[] = {
	242	[1] = &nsm_version1,
	243	};
	244
	245	static struct rpc_stat nsm_stats;
	246
	247	static struct rpc_program nsm_program = {
	248	.name = "statd",
	249	.number = SM_PROGRAM,
e8c96f8c	250	.nrvers = ARRAY_SIZE(nsm_version),
1da177e4 LT	251	.version = nsm_version,
	252	.stats = &nsm_stats
	253	};