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;
39 struct rpc_message msg = {
46 status = PTR_ERR(clnt);
50 memset(&args, 0, sizeof(args));
51 args.mon_name = nsm->sm_name;
52 args.addr = nsm->sm_addr.sin_addr.s_addr;
53 args.prog = NLM_PROGRAM;
55 args.proc = NLMPROC_NSM_NOTIFY;
56 memset(res, 0, sizeof(*res));
58 msg.rpc_proc = &clnt->cl_procinfo[proc];
59 status = rpc_call_sync(clnt, &msg, 0);
61 printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n",
65 rpc_shutdown_client(clnt);
71 * Set up monitoring of a remote host
74 nsm_monitor(struct nlm_host *host)
76 struct nsm_handle *nsm = host->h_nsmhandle;
80 dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
83 if (nsm->sm_monitored)
86 status = nsm_mon_unmon(nsm, SM_MON, &res);
88 if (status < 0 || res.status != 0)
89 printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
91 nsm->sm_monitored = 1;
96 * Cease to monitor remote host
99 nsm_unmonitor(struct nlm_host *host)
101 struct nsm_handle *nsm = host->h_nsmhandle;
107 host->h_nsmhandle = NULL;
109 if (atomic_read(&nsm->sm_count) == 1
110 && nsm->sm_monitored && !nsm->sm_sticky) {
111 dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
113 status = nsm_mon_unmon(nsm, SM_UNMON, &res);
115 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
118 nsm->sm_monitored = 0;
125 * Create NSM client for the local host
127 static struct rpc_clnt *
130 struct sockaddr_in sin = {
131 .sin_family = AF_INET,
132 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
135 struct rpc_create_args args = {
136 .protocol = XPRT_TRANSPORT_UDP,
137 .address = (struct sockaddr *)&sin,
138 .addrsize = sizeof(sin),
139 .servername = "localhost",
140 .program = &nsm_program,
141 .version = SM_VERSION,
142 .authflavor = RPC_AUTH_NULL,
145 return rpc_create(&args);
149 * XDR functions for NSM.
152 static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
154 size_t len = strlen(string);
156 if (len > SM_MAXSTRLEN)
158 return xdr_encode_opaque(p, string, len);
162 xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
164 char buffer[20], *name;
167 * Use the dotted-quad IP address of the remote host as
168 * identifier. Linux statd always looks up the canonical
169 * hostname first for whatever remote hostname it receives,
170 * so this works alright.
172 if (nsm_use_hostnames) {
173 name = argp->mon_name;
175 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
178 if (!(p = xdr_encode_string(p, name))
179 || !(p = xdr_encode_string(p, utsname()->nodename)))
180 return ERR_PTR(-EIO);
181 *p++ = htonl(argp->prog);
182 *p++ = htonl(argp->vers);
183 *p++ = htonl(argp->proc);
189 xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
191 p = xdr_encode_common(rqstp, p, argp);
195 /* Surprise - there may even be room for an IPv6 address now */
200 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
205 xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
207 p = xdr_encode_common(rqstp, p, argp);
210 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
215 xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
217 resp->status = ntohl(*p++);
218 resp->state = ntohl(*p++);
219 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
220 resp->status, resp->state);
225 xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
227 resp->state = ntohl(*p++);
231 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
232 #define SM_my_id_sz (3+1+SM_my_name_sz)
233 #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
234 #define SM_mon_sz (SM_mon_id_sz+4)
235 #define SM_monres_sz 2
236 #define SM_unmonres_sz 1
238 static struct rpc_procinfo nsm_procedures[] = {
241 .p_encode = (kxdrproc_t) xdr_encode_mon,
242 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
243 .p_arglen = SM_mon_sz,
244 .p_replen = SM_monres_sz,
250 .p_encode = (kxdrproc_t) xdr_encode_unmon,
251 .p_decode = (kxdrproc_t) xdr_decode_stat,
252 .p_arglen = SM_mon_id_sz,
253 .p_replen = SM_unmonres_sz,
254 .p_statidx = SM_UNMON,
255 .p_name = "UNMONITOR",
259 static struct rpc_version nsm_version1 = {
261 .nrprocs = ARRAY_SIZE(nsm_procedures),
262 .procs = nsm_procedures
265 static struct rpc_version * nsm_version[] = {
269 static struct rpc_stat nsm_stats;
271 static struct rpc_program nsm_program = {
273 .number = SM_PROGRAM,
274 .nrvers = ARRAY_SIZE(nsm_version),
275 .version = nsm_version,