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/xprtsock.h>
14 #include <linux/sunrpc/svc.h>
15 #include <linux/lockd/lockd.h>
16 #include <linux/lockd/sm_inter.h>
19 #define NLMDBG_FACILITY NLMDBG_MONITOR
21 static struct rpc_clnt * nsm_create(void);
23 static struct rpc_program nsm_program;
31 * Common procedure for SM_MON/SM_UNMON calls
34 nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
36 struct rpc_clnt *clnt;
38 struct nsm_args args = {
39 .addr = nsm_addr_in(nsm)->sin_addr.s_addr,
42 .proc = NLMPROC_NSM_NOTIFY,
43 .mon_name = nsm->sm_mon_name,
45 struct rpc_message msg = {
52 status = PTR_ERR(clnt);
53 dprintk("lockd: failed to create NSM upcall transport, "
54 "status=%d\n", status);
58 memset(res, 0, sizeof(*res));
60 msg.rpc_proc = &clnt->cl_procinfo[proc];
61 status = rpc_call_sync(clnt, &msg, 0);
63 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
67 rpc_shutdown_client(clnt);
73 * Set up monitoring of a remote host
76 nsm_monitor(struct nlm_host *host)
78 struct nsm_handle *nsm = host->h_nsmhandle;
82 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
84 if (nsm->sm_monitored)
88 * Choose whether to record the caller_name or IP address of
89 * this peer in the local rpc.statd's database.
91 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
93 status = nsm_mon_unmon(nsm, SM_MON, &res);
95 if (status < 0 || res.status != 0)
96 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
98 nsm->sm_monitored = 1;
103 * Cease to monitor remote host
106 nsm_unmonitor(struct nlm_host *host)
108 struct nsm_handle *nsm = host->h_nsmhandle;
114 host->h_nsmhandle = NULL;
116 if (atomic_read(&nsm->sm_count) == 1
117 && nsm->sm_monitored && !nsm->sm_sticky) {
118 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
120 status = nsm_mon_unmon(nsm, SM_UNMON, &res);
122 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
125 nsm->sm_monitored = 0;
132 * Create NSM client for the local host
134 static struct rpc_clnt *
137 struct sockaddr_in sin = {
138 .sin_family = AF_INET,
139 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
142 struct rpc_create_args args = {
143 .protocol = XPRT_TRANSPORT_UDP,
144 .address = (struct sockaddr *)&sin,
145 .addrsize = sizeof(sin),
146 .servername = "localhost",
147 .program = &nsm_program,
148 .version = SM_VERSION,
149 .authflavor = RPC_AUTH_NULL,
152 return rpc_create(&args);
156 * XDR functions for NSM.
158 * See http://www.opengroup.org/ for details on the Network
159 * Status Monitor wire protocol.
162 static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
164 size_t len = strlen(string);
166 if (len > SM_MAXSTRLEN)
168 return xdr_encode_opaque(p, string, len);
172 * "mon_name" specifies the host to be monitored.
174 static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp)
176 return xdr_encode_nsm_string(p, argp->mon_name);
180 * The "my_id" argument specifies the hostname and RPC procedure
181 * to be called when the status manager receives notification
182 * (via the SM_NOTIFY call) that the state of host "mon_name"
185 static __be32 *xdr_encode_my_id(__be32 *p, struct nsm_args *argp)
187 p = xdr_encode_nsm_string(p, utsname()->nodename);
189 return ERR_PTR(-EIO);
191 *p++ = htonl(argp->prog);
192 *p++ = htonl(argp->vers);
193 *p++ = htonl(argp->proc);
199 * The "mon_id" argument specifies the non-private arguments
200 * of an SM_MON or SM_UNMON call.
202 static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp)
204 p = xdr_encode_mon_name(p, argp);
206 return ERR_PTR(-EIO);
208 return xdr_encode_my_id(p, argp);
212 * The "priv" argument may contain private information required
213 * by the SM_MON call. This information will be supplied in the
216 * Linux provides the raw IP address of the monitored host,
217 * left in network byte order.
219 static __be32 *xdr_encode_priv(__be32 *p, struct nsm_args *argp)
230 xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
232 p = xdr_encode_mon_id(p, argp);
236 p = xdr_encode_priv(p, argp);
240 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
245 xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
247 p = xdr_encode_mon_id(p, argp);
250 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
255 xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
257 resp->status = ntohl(*p++);
258 resp->state = ntohl(*p++);
259 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
260 resp->status, resp->state);
265 xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
267 resp->state = ntohl(*p++);
271 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
272 #define SM_my_id_sz (SM_my_name_sz+3)
273 #define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
274 #define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
275 #define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
276 #define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
277 #define SM_monres_sz 2
278 #define SM_unmonres_sz 1
280 static struct rpc_procinfo nsm_procedures[] = {
283 .p_encode = (kxdrproc_t) xdr_encode_mon,
284 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
285 .p_arglen = SM_mon_sz,
286 .p_replen = SM_monres_sz,
292 .p_encode = (kxdrproc_t) xdr_encode_unmon,
293 .p_decode = (kxdrproc_t) xdr_decode_stat,
294 .p_arglen = SM_mon_id_sz,
295 .p_replen = SM_unmonres_sz,
296 .p_statidx = SM_UNMON,
297 .p_name = "UNMONITOR",
301 static struct rpc_version nsm_version1 = {
303 .nrprocs = ARRAY_SIZE(nsm_procedures),
304 .procs = nsm_procedures
307 static struct rpc_version * nsm_version[] = {
311 static struct rpc_stat nsm_stats;
313 static struct rpc_program nsm_program = {
315 .number = SM_PROGRAM,
316 .nrvers = ARRAY_SIZE(nsm_version),
317 .version = nsm_version,