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 #define XDR_ADDRBUF_LEN (20)
23 static struct rpc_clnt * nsm_create(void);
25 static struct rpc_program nsm_program;
33 * Common procedure for SM_MON/SM_UNMON calls
36 nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
38 struct rpc_clnt *clnt;
40 struct nsm_args args = {
41 .addr = nsm_addr_in(nsm)->sin_addr.s_addr,
44 .proc = NLMPROC_NSM_NOTIFY,
45 .mon_name = nsm->sm_name,
47 struct rpc_message msg = {
54 status = PTR_ERR(clnt);
55 dprintk("lockd: failed to create NSM upcall transport, "
56 "status=%d\n", status);
60 memset(res, 0, sizeof(*res));
62 msg.rpc_proc = &clnt->cl_procinfo[proc];
63 status = rpc_call_sync(clnt, &msg, 0);
65 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
69 rpc_shutdown_client(clnt);
75 * Set up monitoring of a remote host
78 nsm_monitor(struct nlm_host *host)
80 struct nsm_handle *nsm = host->h_nsmhandle;
84 dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
87 if (nsm->sm_monitored)
90 status = nsm_mon_unmon(nsm, SM_MON, &res);
92 if (status < 0 || res.status != 0)
93 printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
95 nsm->sm_monitored = 1;
100 * Cease to monitor remote host
103 nsm_unmonitor(struct nlm_host *host)
105 struct nsm_handle *nsm = host->h_nsmhandle;
111 host->h_nsmhandle = NULL;
113 if (atomic_read(&nsm->sm_count) == 1
114 && nsm->sm_monitored && !nsm->sm_sticky) {
115 dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
117 status = nsm_mon_unmon(nsm, SM_UNMON, &res);
119 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
122 nsm->sm_monitored = 0;
129 * Create NSM client for the local host
131 static struct rpc_clnt *
134 struct sockaddr_in sin = {
135 .sin_family = AF_INET,
136 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
139 struct rpc_create_args args = {
140 .protocol = XPRT_TRANSPORT_UDP,
141 .address = (struct sockaddr *)&sin,
142 .addrsize = sizeof(sin),
143 .servername = "localhost",
144 .program = &nsm_program,
145 .version = SM_VERSION,
146 .authflavor = RPC_AUTH_NULL,
149 return rpc_create(&args);
153 * XDR functions for NSM.
155 * See http://www.opengroup.org/ for details on the Network
156 * Status Monitor wire protocol.
159 static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
161 size_t len = strlen(string);
163 if (len > SM_MAXSTRLEN)
165 return xdr_encode_opaque(p, string, len);
169 * "mon_name" specifies the host to be monitored.
171 * Linux uses a text version of the IP address of the remote
172 * host as the host identifier (the "mon_name" argument).
174 * Linux statd always looks up the canonical hostname first for
175 * whatever remote hostname it receives, so this works alright.
177 static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp)
179 char buffer[XDR_ADDRBUF_LEN + 1];
180 char *name = argp->mon_name;
182 if (!nsm_use_hostnames) {
183 snprintf(buffer, XDR_ADDRBUF_LEN,
184 "%pI4", &argp->addr);
188 return xdr_encode_nsm_string(p, name);
192 * The "my_id" argument specifies the hostname and RPC procedure
193 * to be called when the status manager receives notification
194 * (via the SM_NOTIFY call) that the state of host "mon_name"
197 static __be32 *xdr_encode_my_id(__be32 *p, struct nsm_args *argp)
199 p = xdr_encode_nsm_string(p, utsname()->nodename);
201 return ERR_PTR(-EIO);
203 *p++ = htonl(argp->prog);
204 *p++ = htonl(argp->vers);
205 *p++ = htonl(argp->proc);
211 * The "mon_id" argument specifies the non-private arguments
212 * of an SM_MON or SM_UNMON call.
214 static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp)
216 p = xdr_encode_mon_name(p, argp);
218 return ERR_PTR(-EIO);
220 return xdr_encode_my_id(p, argp);
224 * The "priv" argument may contain private information required
225 * by the SM_MON call. This information will be supplied in the
228 * Linux provides the raw IP address of the monitored host,
229 * left in network byte order.
231 static __be32 *xdr_encode_priv(__be32 *p, struct nsm_args *argp)
242 xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
244 p = xdr_encode_mon_id(p, argp);
248 p = xdr_encode_priv(p, argp);
252 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
257 xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
259 p = xdr_encode_mon_id(p, argp);
262 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
267 xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
269 resp->status = ntohl(*p++);
270 resp->state = ntohl(*p++);
271 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
272 resp->status, resp->state);
277 xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
279 resp->state = ntohl(*p++);
283 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
284 #define SM_my_id_sz (SM_my_name_sz+3)
285 #define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
286 #define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
287 #define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
288 #define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
289 #define SM_monres_sz 2
290 #define SM_unmonres_sz 1
292 static struct rpc_procinfo nsm_procedures[] = {
295 .p_encode = (kxdrproc_t) xdr_encode_mon,
296 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
297 .p_arglen = SM_mon_sz,
298 .p_replen = SM_monres_sz,
304 .p_encode = (kxdrproc_t) xdr_encode_unmon,
305 .p_decode = (kxdrproc_t) xdr_decode_stat,
306 .p_arglen = SM_mon_id_sz,
307 .p_replen = SM_unmonres_sz,
308 .p_statidx = SM_UNMON,
309 .p_name = "UNMONITOR",
313 static struct rpc_version nsm_version1 = {
315 .nrprocs = ARRAY_SIZE(nsm_procedures),
316 .procs = nsm_procedures
319 static struct rpc_version * nsm_version[] = {
323 static struct rpc_stat nsm_stats;
325 static struct rpc_program nsm_program = {
327 .number = SM_PROGRAM,
328 .nrvers = ARRAY_SIZE(nsm_version),
329 .version = nsm_version,