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
20 #define NSM_PROGRAM 100024
34 __be32 addr; /* remote address */
35 u32 prog; /* RPC callback info */
47 static struct rpc_clnt * nsm_create(void);
49 static struct rpc_program nsm_program;
57 * Common procedure for NSMPROC_MON/NSMPROC_UNMON calls
60 nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
62 struct rpc_clnt *clnt;
64 struct nsm_args args = {
65 .addr = nsm_addr_in(nsm)->sin_addr.s_addr,
68 .proc = NLMPROC_NSM_NOTIFY,
69 .mon_name = nsm->sm_mon_name,
71 struct rpc_message msg = {
78 status = PTR_ERR(clnt);
79 dprintk("lockd: failed to create NSM upcall transport, "
80 "status=%d\n", status);
84 memset(res, 0, sizeof(*res));
86 msg.rpc_proc = &clnt->cl_procinfo[proc];
87 status = rpc_call_sync(clnt, &msg, 0);
89 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
93 rpc_shutdown_client(clnt);
99 * nsm_monitor - Notify a peer in case we reboot
100 * @host: pointer to nlm_host of peer to notify
102 * If this peer is not already monitored, this function sends an
103 * upcall to the local rpc.statd to record the name/address of
104 * the peer to notify in case we reboot.
106 * Returns zero if the peer is monitored by the local rpc.statd;
107 * otherwise a negative errno value is returned.
109 int nsm_monitor(const struct nlm_host *host)
111 struct nsm_handle *nsm = host->h_nsmhandle;
115 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
117 if (nsm->sm_monitored)
121 * Choose whether to record the caller_name or IP address of
122 * this peer in the local rpc.statd's database.
124 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
126 status = nsm_mon_unmon(nsm, NSMPROC_MON, &res);
130 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
132 nsm->sm_monitored = 1;
137 * nsm_unmonitor - Unregister peer notification
138 * @host: pointer to nlm_host of peer to stop monitoring
140 * If this peer is monitored, this function sends an upcall to
141 * tell the local rpc.statd not to send this peer a notification
144 void nsm_unmonitor(const struct nlm_host *host)
146 struct nsm_handle *nsm = host->h_nsmhandle;
150 if (atomic_read(&nsm->sm_count) == 1
151 && nsm->sm_monitored && !nsm->sm_sticky) {
152 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
154 status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res);
158 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
161 nsm->sm_monitored = 0;
166 * Create NSM client for the local host
168 static struct rpc_clnt *
171 struct sockaddr_in sin = {
172 .sin_family = AF_INET,
173 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
176 struct rpc_create_args args = {
177 .protocol = XPRT_TRANSPORT_UDP,
178 .address = (struct sockaddr *)&sin,
179 .addrsize = sizeof(sin),
180 .servername = "localhost",
181 .program = &nsm_program,
182 .version = NSM_VERSION,
183 .authflavor = RPC_AUTH_NULL,
186 return rpc_create(&args);
190 * XDR functions for NSM.
192 * See http://www.opengroup.org/ for details on the Network
193 * Status Monitor wire protocol.
196 static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
198 size_t len = strlen(string);
200 if (len > SM_MAXSTRLEN)
202 return xdr_encode_opaque(p, string, len);
206 * "mon_name" specifies the host to be monitored.
208 static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp)
210 return xdr_encode_nsm_string(p, argp->mon_name);
214 * The "my_id" argument specifies the hostname and RPC procedure
215 * to be called when the status manager receives notification
216 * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
219 static __be32 *xdr_encode_my_id(__be32 *p, struct nsm_args *argp)
221 p = xdr_encode_nsm_string(p, utsname()->nodename);
223 return ERR_PTR(-EIO);
225 *p++ = htonl(argp->prog);
226 *p++ = htonl(argp->vers);
227 *p++ = htonl(argp->proc);
233 * The "mon_id" argument specifies the non-private arguments
234 * of an NSMPROC_MON or NSMPROC_UNMON call.
236 static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp)
238 p = xdr_encode_mon_name(p, argp);
240 return ERR_PTR(-EIO);
242 return xdr_encode_my_id(p, argp);
246 * The "priv" argument may contain private information required
247 * by the NSMPROC_MON call. This information will be supplied in the
248 * NLMPROC_SM_NOTIFY call.
250 * Linux provides the raw IP address of the monitored host,
251 * left in network byte order.
253 static __be32 *xdr_encode_priv(__be32 *p, struct nsm_args *argp)
264 xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
266 p = xdr_encode_mon_id(p, argp);
270 p = xdr_encode_priv(p, argp);
274 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
279 xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
281 p = xdr_encode_mon_id(p, argp);
284 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
289 xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
291 resp->status = ntohl(*p++);
292 resp->state = ntohl(*p++);
293 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
294 resp->status, resp->state);
299 xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
301 resp->state = ntohl(*p++);
305 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
306 #define SM_my_id_sz (SM_my_name_sz+3)
307 #define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
308 #define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
309 #define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
310 #define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
311 #define SM_monres_sz 2
312 #define SM_unmonres_sz 1
314 static struct rpc_procinfo nsm_procedures[] = {
316 .p_proc = NSMPROC_MON,
317 .p_encode = (kxdrproc_t) xdr_encode_mon,
318 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
319 .p_arglen = SM_mon_sz,
320 .p_replen = SM_monres_sz,
321 .p_statidx = NSMPROC_MON,
325 .p_proc = NSMPROC_UNMON,
326 .p_encode = (kxdrproc_t) xdr_encode_unmon,
327 .p_decode = (kxdrproc_t) xdr_decode_stat,
328 .p_arglen = SM_mon_id_sz,
329 .p_replen = SM_unmonres_sz,
330 .p_statidx = NSMPROC_UNMON,
331 .p_name = "UNMONITOR",
335 static struct rpc_version nsm_version1 = {
337 .nrprocs = ARRAY_SIZE(nsm_procedures),
338 .procs = nsm_procedures
341 static struct rpc_version * nsm_version[] = {
345 static struct rpc_stat nsm_stats;
347 static struct rpc_program nsm_program = {
349 .number = NSM_PROGRAM,
350 .nrvers = ARRAY_SIZE(nsm_version),
351 .version = nsm_version,