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
22 __be32 addr; /* remote address */
23 u32 prog; /* RPC callback info */
35 static struct rpc_clnt * nsm_create(void);
37 static struct rpc_program nsm_program;
45 * Common procedure for SM_MON/SM_UNMON calls
48 nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
50 struct rpc_clnt *clnt;
52 struct nsm_args args = {
53 .addr = nsm_addr_in(nsm)->sin_addr.s_addr,
56 .proc = NLMPROC_NSM_NOTIFY,
57 .mon_name = nsm->sm_mon_name,
59 struct rpc_message msg = {
66 status = PTR_ERR(clnt);
67 dprintk("lockd: failed to create NSM upcall transport, "
68 "status=%d\n", status);
72 memset(res, 0, sizeof(*res));
74 msg.rpc_proc = &clnt->cl_procinfo[proc];
75 status = rpc_call_sync(clnt, &msg, 0);
77 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
81 rpc_shutdown_client(clnt);
87 * nsm_monitor - Notify a peer in case we reboot
88 * @host: pointer to nlm_host of peer to notify
90 * If this peer is not already monitored, this function sends an
91 * upcall to the local rpc.statd to record the name/address of
92 * the peer to notify in case we reboot.
94 * Returns zero if the peer is monitored by the local rpc.statd;
95 * otherwise a negative errno value is returned.
97 int nsm_monitor(const struct nlm_host *host)
99 struct nsm_handle *nsm = host->h_nsmhandle;
103 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
105 if (nsm->sm_monitored)
109 * Choose whether to record the caller_name or IP address of
110 * this peer in the local rpc.statd's database.
112 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
114 status = nsm_mon_unmon(nsm, SM_MON, &res);
118 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
120 nsm->sm_monitored = 1;
125 * nsm_unmonitor - Unregister peer notification
126 * @host: pointer to nlm_host of peer to stop monitoring
128 * If this peer is monitored, this function sends an upcall to
129 * tell the local rpc.statd not to send this peer a notification
132 void nsm_unmonitor(const struct nlm_host *host)
134 struct nsm_handle *nsm = host->h_nsmhandle;
138 if (atomic_read(&nsm->sm_count) == 1
139 && nsm->sm_monitored && !nsm->sm_sticky) {
140 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
142 status = nsm_mon_unmon(nsm, SM_UNMON, &res);
146 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
149 nsm->sm_monitored = 0;
154 * Create NSM client for the local host
156 static struct rpc_clnt *
159 struct sockaddr_in sin = {
160 .sin_family = AF_INET,
161 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
164 struct rpc_create_args args = {
165 .protocol = XPRT_TRANSPORT_UDP,
166 .address = (struct sockaddr *)&sin,
167 .addrsize = sizeof(sin),
168 .servername = "localhost",
169 .program = &nsm_program,
170 .version = SM_VERSION,
171 .authflavor = RPC_AUTH_NULL,
174 return rpc_create(&args);
178 * XDR functions for NSM.
180 * See http://www.opengroup.org/ for details on the Network
181 * Status Monitor wire protocol.
184 static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
186 size_t len = strlen(string);
188 if (len > SM_MAXSTRLEN)
190 return xdr_encode_opaque(p, string, len);
194 * "mon_name" specifies the host to be monitored.
196 static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp)
198 return xdr_encode_nsm_string(p, argp->mon_name);
202 * The "my_id" argument specifies the hostname and RPC procedure
203 * to be called when the status manager receives notification
204 * (via the SM_NOTIFY call) that the state of host "mon_name"
207 static __be32 *xdr_encode_my_id(__be32 *p, struct nsm_args *argp)
209 p = xdr_encode_nsm_string(p, utsname()->nodename);
211 return ERR_PTR(-EIO);
213 *p++ = htonl(argp->prog);
214 *p++ = htonl(argp->vers);
215 *p++ = htonl(argp->proc);
221 * The "mon_id" argument specifies the non-private arguments
222 * of an SM_MON or SM_UNMON call.
224 static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp)
226 p = xdr_encode_mon_name(p, argp);
228 return ERR_PTR(-EIO);
230 return xdr_encode_my_id(p, argp);
234 * The "priv" argument may contain private information required
235 * by the SM_MON call. This information will be supplied in the
238 * Linux provides the raw IP address of the monitored host,
239 * left in network byte order.
241 static __be32 *xdr_encode_priv(__be32 *p, struct nsm_args *argp)
252 xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
254 p = xdr_encode_mon_id(p, argp);
258 p = xdr_encode_priv(p, argp);
262 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
267 xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
269 p = xdr_encode_mon_id(p, argp);
272 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
277 xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
279 resp->status = ntohl(*p++);
280 resp->state = ntohl(*p++);
281 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
282 resp->status, resp->state);
287 xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
289 resp->state = ntohl(*p++);
293 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
294 #define SM_my_id_sz (SM_my_name_sz+3)
295 #define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
296 #define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
297 #define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
298 #define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
299 #define SM_monres_sz 2
300 #define SM_unmonres_sz 1
302 static struct rpc_procinfo nsm_procedures[] = {
305 .p_encode = (kxdrproc_t) xdr_encode_mon,
306 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
307 .p_arglen = SM_mon_sz,
308 .p_replen = SM_monres_sz,
314 .p_encode = (kxdrproc_t) xdr_encode_unmon,
315 .p_decode = (kxdrproc_t) xdr_decode_stat,
316 .p_arglen = SM_mon_id_sz,
317 .p_replen = SM_unmonres_sz,
318 .p_statidx = SM_UNMON,
319 .p_name = "UNMONITOR",
323 static struct rpc_version nsm_version1 = {
325 .nrprocs = ARRAY_SIZE(nsm_procedures),
326 .procs = nsm_procedures
329 static struct rpc_version * nsm_version[] = {
333 static struct rpc_stat nsm_stats;
335 static struct rpc_program nsm_program = {
337 .number = SM_PROGRAM,
338 .nrvers = ARRAY_SIZE(nsm_version),
339 .version = nsm_version,