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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);
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);
if (host->h_monitored)
return 0;
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 = 0;
dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
if (!host->h_monitored)
return 0;
host->h_monitored = 0;
if (!host->h_killed) {
status = nsm_mon_unmon(host, SM_UNMON, &res);
if (status < 0)
printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name);
}
return status;
}
/*
* Create NSM client for the local host
*/
static struct rpc_clnt *
nsm_create(void)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
.sin_port = 0,
};
struct rpc_create_args args = {
.protocol = IPPROTO_UDP,
.address = (struct sockaddr *)&sin,
.addrsize = sizeof(sin),
.servername = "localhost",
.program = &nsm_program,
.version = SM_VERSION,
.authflavor = RPC_AUTH_NULL,
.flags = (RPC_CLNT_CREATE_ONESHOT),
};
return rpc_create(&args);
}
/*
* 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, 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
};
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