4 * The kernel statd client.
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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>
18 #define NLMDBG_FACILITY NLMDBG_MONITOR
20 static struct rpc_clnt * nsm_create(void);
22 extern struct rpc_program nsm_program;
30 * Common procedure for SM_MON/SM_UNMON calls
33 nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res)
35 struct rpc_clnt *clnt;
44 args.addr = host->h_addr.sin_addr.s_addr;
45 args.prog = NLM_PROGRAM;
46 args.vers = host->h_version;
47 args.proc = NLMPROC_NSM_NOTIFY;
48 memset(res, 0, sizeof(*res));
50 status = rpc_call(clnt, proc, &args, res, 0);
52 printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n",
61 * Set up monitoring of a remote host
64 nsm_monitor(struct nlm_host *host)
69 dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
71 status = nsm_mon_unmon(host, SM_MON, &res);
73 if (status < 0 || res.status != 0)
74 printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
76 host->h_monitored = 1;
81 * Cease to monitor remote host
84 nsm_unmonitor(struct nlm_host *host)
89 dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
91 status = nsm_mon_unmon(host, SM_UNMON, &res);
93 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name);
95 host->h_monitored = 0;
100 * Create NSM client for the local host
102 static struct rpc_clnt *
105 struct rpc_xprt *xprt;
106 struct rpc_clnt *clnt = NULL;
107 struct sockaddr_in sin;
109 sin.sin_family = AF_INET;
110 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
113 xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL);
117 clnt = rpc_create_client(xprt, "localhost",
118 &nsm_program, SM_VERSION,
122 clnt->cl_softrtry = 1;
124 clnt->cl_oneshot = 1;
125 xprt->resvport = 1; /* NSM requires a reserved port */
135 * XDR functions for NSM.
138 xdr_error(struct rpc_rqst *rqstp, u32 *p, void *dummy)
144 xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
147 u32 addr = ntohl(argp->addr);
149 dprintk("nsm: xdr_encode_mon(%08x, %d, %d, %d)\n",
150 htonl(argp->addr), htonl(argp->prog),
151 htonl(argp->vers), htonl(argp->proc));
154 * Use the dotted-quad IP address of the remote host as
155 * identifier. Linux statd always looks up the canonical
156 * hostname first for whatever remote hostname it receives,
157 * so this works alright.
159 sprintf(buffer, "%d.%d.%d.%d", (addr>>24) & 0xff, (addr>>16) & 0xff,
160 (addr>>8) & 0xff, (addr) & 0xff);
161 if (!(p = xdr_encode_string(p, buffer))
162 || !(p = xdr_encode_string(p, system_utsname.nodename)))
164 *p++ = htonl(argp->prog);
165 *p++ = htonl(argp->vers);
166 *p++ = htonl(argp->proc);
168 /* This is the private part. Needed only for SM_MON call */
169 if (rqstp->rq_task->tk_msg.rpc_proc == SM_MON) {
176 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
181 xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
183 resp->status = ntohl(*p++);
184 resp->state = ntohl(*p++);
185 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
186 resp->status, resp->state);
191 xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
193 resp->state = ntohl(*p++);
197 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
198 #define SM_my_id_sz (3+1+SM_my_name_sz)
199 #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
200 #define SM_mon_sz (SM_mon_id_sz+4)
201 #define SM_monres_sz 2
202 #define SM_unmonres_sz 1
205 # define MAX(a, b) (((a) > (b))? (a) : (b))
208 static struct rpc_procinfo nsm_procedures[] = {
210 (kxdrproc_t) xdr_error,
211 (kxdrproc_t) xdr_error, 0, 0 },
213 (kxdrproc_t) xdr_error,
214 (kxdrproc_t) xdr_error, 0, 0 },
216 (kxdrproc_t) xdr_encode_mon,
217 (kxdrproc_t) xdr_decode_stat_res, MAX(SM_mon_sz, SM_monres_sz) << 2, 0 },
219 (kxdrproc_t) xdr_encode_mon,
220 (kxdrproc_t) xdr_decode_stat, MAX(SM_mon_id_sz, SM_unmonres_sz) << 2, 0 },
222 (kxdrproc_t) xdr_error,
223 (kxdrproc_t) xdr_error, 0, 0 },
225 (kxdrproc_t) xdr_error,
226 (kxdrproc_t) xdr_error, 0, 0 },
228 (kxdrproc_t) xdr_error,
229 (kxdrproc_t) xdr_error, 0, 0 },
232 static struct rpc_version nsm_version1 = {
234 sizeof(nsm_procedures)/sizeof(nsm_procedures[0]),
238 static struct rpc_version * nsm_version[] = {
243 static struct rpc_stat nsm_stats;
245 struct rpc_program nsm_program = {
248 sizeof(nsm_version)/sizeof(nsm_version[0]),