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 * nsm_monitor - Notify a peer in case we reboot
74 * @host: pointer to nlm_host of peer to notify
76 * If this peer is not already monitored, this function sends an
77 * upcall to the local rpc.statd to record the name/address of
78 * the peer to notify in case we reboot.
80 * Returns zero if the peer is monitored by the local rpc.statd;
81 * otherwise a negative errno value is returned.
83 int nsm_monitor(const struct nlm_host *host)
85 struct nsm_handle *nsm = host->h_nsmhandle;
89 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
91 if (nsm->sm_monitored)
95 * Choose whether to record the caller_name or IP address of
96 * this peer in the local rpc.statd's database.
98 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
100 status = nsm_mon_unmon(nsm, SM_MON, &res);
104 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
106 nsm->sm_monitored = 1;
111 * nsm_unmonitor - Unregister peer notification
112 * @host: pointer to nlm_host of peer to stop monitoring
114 * If this peer is monitored, this function sends an upcall to
115 * tell the local rpc.statd not to send this peer a notification
118 void nsm_unmonitor(const struct nlm_host *host)
120 struct nsm_handle *nsm = host->h_nsmhandle;
124 if (atomic_read(&nsm->sm_count) == 1
125 && nsm->sm_monitored && !nsm->sm_sticky) {
126 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
128 status = nsm_mon_unmon(nsm, SM_UNMON, &res);
130 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
133 nsm->sm_monitored = 0;
138 * Create NSM client for the local host
140 static struct rpc_clnt *
143 struct sockaddr_in sin = {
144 .sin_family = AF_INET,
145 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
148 struct rpc_create_args args = {
149 .protocol = XPRT_TRANSPORT_UDP,
150 .address = (struct sockaddr *)&sin,
151 .addrsize = sizeof(sin),
152 .servername = "localhost",
153 .program = &nsm_program,
154 .version = SM_VERSION,
155 .authflavor = RPC_AUTH_NULL,
158 return rpc_create(&args);
162 * XDR functions for NSM.
164 * See http://www.opengroup.org/ for details on the Network
165 * Status Monitor wire protocol.
168 static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
170 size_t len = strlen(string);
172 if (len > SM_MAXSTRLEN)
174 return xdr_encode_opaque(p, string, len);
178 * "mon_name" specifies the host to be monitored.
180 static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp)
182 return xdr_encode_nsm_string(p, argp->mon_name);
186 * The "my_id" argument specifies the hostname and RPC procedure
187 * to be called when the status manager receives notification
188 * (via the SM_NOTIFY call) that the state of host "mon_name"
191 static __be32 *xdr_encode_my_id(__be32 *p, struct nsm_args *argp)
193 p = xdr_encode_nsm_string(p, utsname()->nodename);
195 return ERR_PTR(-EIO);
197 *p++ = htonl(argp->prog);
198 *p++ = htonl(argp->vers);
199 *p++ = htonl(argp->proc);
205 * The "mon_id" argument specifies the non-private arguments
206 * of an SM_MON or SM_UNMON call.
208 static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp)
210 p = xdr_encode_mon_name(p, argp);
212 return ERR_PTR(-EIO);
214 return xdr_encode_my_id(p, argp);
218 * The "priv" argument may contain private information required
219 * by the SM_MON call. This information will be supplied in the
222 * Linux provides the raw IP address of the monitored host,
223 * left in network byte order.
225 static __be32 *xdr_encode_priv(__be32 *p, struct nsm_args *argp)
236 xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
238 p = xdr_encode_mon_id(p, argp);
242 p = xdr_encode_priv(p, argp);
246 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
251 xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
253 p = xdr_encode_mon_id(p, argp);
256 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
261 xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
263 resp->status = ntohl(*p++);
264 resp->state = ntohl(*p++);
265 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
266 resp->status, resp->state);
271 xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
273 resp->state = ntohl(*p++);
277 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
278 #define SM_my_id_sz (SM_my_name_sz+3)
279 #define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
280 #define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
281 #define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
282 #define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
283 #define SM_monres_sz 2
284 #define SM_unmonres_sz 1
286 static struct rpc_procinfo nsm_procedures[] = {
289 .p_encode = (kxdrproc_t) xdr_encode_mon,
290 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
291 .p_arglen = SM_mon_sz,
292 .p_replen = SM_monres_sz,
298 .p_encode = (kxdrproc_t) xdr_encode_unmon,
299 .p_decode = (kxdrproc_t) xdr_decode_stat,
300 .p_arglen = SM_mon_id_sz,
301 .p_replen = SM_unmonres_sz,
302 .p_statidx = SM_UNMON,
303 .p_name = "UNMONITOR",
307 static struct rpc_version nsm_version1 = {
309 .nrprocs = ARRAY_SIZE(nsm_procedures),
310 .procs = nsm_procedures
313 static struct rpc_version * nsm_version[] = {
317 static struct rpc_stat nsm_stats;
319 static struct rpc_program nsm_program = {
321 .number = SM_PROGRAM,
322 .nrvers = ARRAY_SIZE(nsm_version),
323 .version = nsm_version,