1 /*
2 * linux/fs/lockd/mon.c
3 *
4 * The kernel statd client.
5 *
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7 */
8
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>
17
18
19 #define NLMDBG_FACILITY NLMDBG_MONITOR
20
21 static struct rpc_clnt * nsm_create(void);
22
23 static struct rpc_program nsm_program;
24
25 /*
26 * Local NSM state
27 */
28 int nsm_local_state;
29
30 /*
31 * Common procedure for SM_MON/SM_UNMON calls
32 */
33 static int
34 nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
35 {
36 struct rpc_clnt *clnt;
37 int status;
38 struct nsm_args args;
39 struct rpc_message msg = {
40 .rpc_argp = &args,
41 .rpc_resp = res,
42 };
43
44 clnt = nsm_create();
45 if (IS_ERR(clnt)) {
46 status = PTR_ERR(clnt);
47 goto out;
48 }
49
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;
54 args.vers = 3;
55 args.proc = NLMPROC_NSM_NOTIFY;
56 memset(res, 0, sizeof(*res));
57
58 msg.rpc_proc = &clnt->cl_procinfo[proc];
59 status = rpc_call_sync(clnt, &msg, 0);
60 if (status < 0)
61 printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n",
62 status);
63 else
64 status = 0;
65 rpc_shutdown_client(clnt);
66 out:
67 return status;
68 }
69
70 /*
71 * Set up monitoring of a remote host
72 */
73 int
74 nsm_monitor(struct nlm_host *host)
75 {
76 struct nsm_handle *nsm = host->h_nsmhandle;
77 struct nsm_res res;
78 int status;
79
80 dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
81 BUG_ON(nsm == NULL);
82
83 if (nsm->sm_monitored)
84 return 0;
85
86 status = nsm_mon_unmon(nsm, SM_MON, &res);
87
88 if (status < 0 || res.status != 0)
89 printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
90 else
91 nsm->sm_monitored = 1;
92 return status;
93 }
94
95 /*
96 * Cease to monitor remote host
97 */
98 int
99 nsm_unmonitor(struct nlm_host *host)
100 {
101 struct nsm_handle *nsm = host->h_nsmhandle;
102 struct nsm_res res;
103 int status = 0;
104
105 if (nsm == NULL)
106 return 0;
107 host->h_nsmhandle = NULL;
108
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);
112
113 status = nsm_mon_unmon(nsm, SM_UNMON, &res);
114 if (status < 0)
115 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
116 host->h_name);
117 else
118 nsm->sm_monitored = 0;
119 }
120 nsm_release(nsm);
121 return status;
122 }
123
124 /*
125 * Create NSM client for the local host
126 */
127 static struct rpc_clnt *
128 nsm_create(void)
129 {
130 struct sockaddr_in sin = {
131 .sin_family = AF_INET,
132 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
133 .sin_port = 0,
134 };
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,
143 };
144
145 return rpc_create(&args);
146 }
147
148 /*
149 * XDR functions for NSM.
150 */
151
152 static __be32 *
153 xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
154 {
155 char buffer[20], *name;
156
157 /*
158 * Use the dotted-quad IP address of the remote host as
159 * identifier. Linux statd always looks up the canonical
160 * hostname first for whatever remote hostname it receives,
161 * so this works alright.
162 */
163 if (nsm_use_hostnames) {
164 name = argp->mon_name;
165 } else {
166 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
167 name = buffer;
168 }
169 if (!(p = xdr_encode_string(p, name))
170 || !(p = xdr_encode_string(p, utsname()->nodename)))
171 return ERR_PTR(-EIO);
172 *p++ = htonl(argp->prog);
173 *p++ = htonl(argp->vers);
174 *p++ = htonl(argp->proc);
175
176 return p;
177 }
178
179 static int
180 xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
181 {
182 p = xdr_encode_common(rqstp, p, argp);
183 if (IS_ERR(p))
184 return PTR_ERR(p);
185
186 /* Surprise - there may even be room for an IPv6 address now */
187 *p++ = argp->addr;
188 *p++ = 0;
189 *p++ = 0;
190 *p++ = 0;
191 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
192 return 0;
193 }
194
195 static int
196 xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
197 {
198 p = xdr_encode_common(rqstp, p, argp);
199 if (IS_ERR(p))
200 return PTR_ERR(p);
201 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
202 return 0;
203 }
204
205 static int
206 xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
207 {
208 resp->status = ntohl(*p++);
209 resp->state = ntohl(*p++);
210 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
211 resp->status, resp->state);
212 return 0;
213 }
214
215 static int
216 xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp)
217 {
218 resp->state = ntohl(*p++);
219 return 0;
220 }
221
222 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
223 #define SM_my_id_sz (3+1+SM_my_name_sz)
224 #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
225 #define SM_mon_sz (SM_mon_id_sz+4)
226 #define SM_monres_sz 2
227 #define SM_unmonres_sz 1
228
229 static struct rpc_procinfo nsm_procedures[] = {
230 [SM_MON] = {
231 .p_proc = SM_MON,
232 .p_encode = (kxdrproc_t) xdr_encode_mon,
233 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
234 .p_arglen = SM_mon_sz,
235 .p_replen = SM_monres_sz,
236 .p_statidx = SM_MON,
237 .p_name = "MONITOR",
238 },
239 [SM_UNMON] = {
240 .p_proc = SM_UNMON,
241 .p_encode = (kxdrproc_t) xdr_encode_unmon,
242 .p_decode = (kxdrproc_t) xdr_decode_stat,
243 .p_arglen = SM_mon_id_sz,
244 .p_replen = SM_unmonres_sz,
245 .p_statidx = SM_UNMON,
246 .p_name = "UNMONITOR",
247 },
248 };
249
250 static struct rpc_version nsm_version1 = {
251 .number = 1,
252 .nrprocs = ARRAY_SIZE(nsm_procedures),
253 .procs = nsm_procedures
254 };
255
256 static struct rpc_version * nsm_version[] = {
257 [1] = &nsm_version1,
258 };
259
260 static struct rpc_stat nsm_stats;
261
262 static struct rpc_program nsm_program = {
263 .name = "statd",
264 .number = SM_PROGRAM,
265 .nrvers = ARRAY_SIZE(nsm_version),
266 .version = nsm_version,
267 .stats = &nsm_stats
268 };
269
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