]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
0896a725 | 13 | #include <linux/sunrpc/xprtsock.h> |
1da177e4 LT |
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 | |
36e8e668 CL |
20 | #define NSM_PROGRAM 100024 |
21 | #define NSM_VERSION 1 | |
22 | ||
23 | enum { | |
24 | NSMPROC_NULL, | |
25 | NSMPROC_STAT, | |
26 | NSMPROC_MON, | |
27 | NSMPROC_UNMON, | |
28 | NSMPROC_UNMON_ALL, | |
29 | NSMPROC_SIMU_CRASH, | |
30 | NSMPROC_NOTIFY, | |
31 | }; | |
1da177e4 | 32 | |
9c1bfd03 CL |
33 | struct nsm_args { |
34 | __be32 addr; /* remote address */ | |
35 | u32 prog; /* RPC callback info */ | |
36 | u32 vers; | |
37 | u32 proc; | |
38 | ||
39 | char *mon_name; | |
40 | }; | |
41 | ||
42 | struct nsm_res { | |
43 | u32 status; | |
44 | u32 state; | |
45 | }; | |
46 | ||
1da177e4 LT |
47 | static struct rpc_clnt * nsm_create(void); |
48 | ||
49 | static struct rpc_program nsm_program; | |
50 | ||
51 | /* | |
52 | * Local NSM state | |
53 | */ | |
460f5cac | 54 | int nsm_local_state; |
1da177e4 LT |
55 | |
56 | /* | |
36e8e668 | 57 | * Common procedure for NSMPROC_MON/NSMPROC_UNMON calls |
1da177e4 LT |
58 | */ |
59 | static int | |
9502c522 | 60 | nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res) |
1da177e4 LT |
61 | { |
62 | struct rpc_clnt *clnt; | |
63 | int status; | |
a4846750 CL |
64 | struct nsm_args args = { |
65 | .addr = nsm_addr_in(nsm)->sin_addr.s_addr, | |
66 | .prog = NLM_PROGRAM, | |
67 | .vers = 3, | |
68 | .proc = NLMPROC_NSM_NOTIFY, | |
29ed1407 | 69 | .mon_name = nsm->sm_mon_name, |
a4846750 | 70 | }; |
dead28da CL |
71 | struct rpc_message msg = { |
72 | .rpc_argp = &args, | |
73 | .rpc_resp = res, | |
74 | }; | |
1da177e4 LT |
75 | |
76 | clnt = nsm_create(); | |
77 | if (IS_ERR(clnt)) { | |
78 | status = PTR_ERR(clnt); | |
5acf4315 CL |
79 | dprintk("lockd: failed to create NSM upcall transport, " |
80 | "status=%d\n", status); | |
1da177e4 LT |
81 | goto out; |
82 | } | |
83 | ||
1da177e4 LT |
84 | memset(res, 0, sizeof(*res)); |
85 | ||
dead28da CL |
86 | msg.rpc_proc = &clnt->cl_procinfo[proc]; |
87 | status = rpc_call_sync(clnt, &msg, 0); | |
1da177e4 | 88 | if (status < 0) |
5acf4315 CL |
89 | dprintk("lockd: NSM upcall RPC failed, status=%d\n", |
90 | status); | |
1da177e4 LT |
91 | else |
92 | status = 0; | |
90c5755f | 93 | rpc_shutdown_client(clnt); |
1da177e4 LT |
94 | out: |
95 | return status; | |
96 | } | |
97 | ||
1e49323c CL |
98 | /** |
99 | * nsm_monitor - Notify a peer in case we reboot | |
100 | * @host: pointer to nlm_host of peer to notify | |
101 | * | |
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. | |
105 | * | |
106 | * Returns zero if the peer is monitored by the local rpc.statd; | |
107 | * otherwise a negative errno value is returned. | |
1da177e4 | 108 | */ |
1e49323c | 109 | int nsm_monitor(const struct nlm_host *host) |
1da177e4 | 110 | { |
8dead0db | 111 | struct nsm_handle *nsm = host->h_nsmhandle; |
1da177e4 LT |
112 | struct nsm_res res; |
113 | int status; | |
114 | ||
9fee4902 | 115 | dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name); |
8dead0db OK |
116 | |
117 | if (nsm->sm_monitored) | |
977faf39 | 118 | return 0; |
1da177e4 | 119 | |
29ed1407 CL |
120 | /* |
121 | * Choose whether to record the caller_name or IP address of | |
122 | * this peer in the local rpc.statd's database. | |
123 | */ | |
124 | nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf; | |
125 | ||
36e8e668 | 126 | status = nsm_mon_unmon(nsm, NSMPROC_MON, &res); |
5d254b11 CL |
127 | if (res.status != 0) |
128 | status = -EIO; | |
129 | if (status < 0) | |
9fee4902 | 130 | printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name); |
1da177e4 | 131 | else |
8dead0db | 132 | nsm->sm_monitored = 1; |
1da177e4 LT |
133 | return status; |
134 | } | |
135 | ||
356c3eb4 CL |
136 | /** |
137 | * nsm_unmonitor - Unregister peer notification | |
138 | * @host: pointer to nlm_host of peer to stop monitoring | |
139 | * | |
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 | |
142 | * when we reboot. | |
1da177e4 | 143 | */ |
356c3eb4 | 144 | void nsm_unmonitor(const struct nlm_host *host) |
1da177e4 | 145 | { |
8dead0db | 146 | struct nsm_handle *nsm = host->h_nsmhandle; |
1da177e4 | 147 | struct nsm_res res; |
356c3eb4 | 148 | int status; |
1da177e4 | 149 | |
9502c522 OK |
150 | if (atomic_read(&nsm->sm_count) == 1 |
151 | && nsm->sm_monitored && !nsm->sm_sticky) { | |
9fee4902 | 152 | dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name); |
9502c522 | 153 | |
36e8e668 | 154 | status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res); |
0c7aef45 CL |
155 | if (res.status != 0) |
156 | status = -EIO; | |
977faf39 | 157 | if (status < 0) |
9502c522 | 158 | printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", |
9fee4902 | 159 | nsm->sm_name); |
9502c522 OK |
160 | else |
161 | nsm->sm_monitored = 0; | |
977faf39 | 162 | } |
1da177e4 LT |
163 | } |
164 | ||
165 | /* | |
166 | * Create NSM client for the local host | |
167 | */ | |
168 | static struct rpc_clnt * | |
169 | nsm_create(void) | |
170 | { | |
e1ec7892 CL |
171 | struct sockaddr_in sin = { |
172 | .sin_family = AF_INET, | |
173 | .sin_addr.s_addr = htonl(INADDR_LOOPBACK), | |
174 | .sin_port = 0, | |
175 | }; | |
176 | struct rpc_create_args args = { | |
0896a725 | 177 | .protocol = XPRT_TRANSPORT_UDP, |
e1ec7892 CL |
178 | .address = (struct sockaddr *)&sin, |
179 | .addrsize = sizeof(sin), | |
180 | .servername = "localhost", | |
181 | .program = &nsm_program, | |
36e8e668 | 182 | .version = NSM_VERSION, |
e1ec7892 | 183 | .authflavor = RPC_AUTH_NULL, |
e1ec7892 CL |
184 | }; |
185 | ||
186 | return rpc_create(&args); | |
1da177e4 LT |
187 | } |
188 | ||
189 | /* | |
190 | * XDR functions for NSM. | |
2ca7754d CL |
191 | * |
192 | * See http://www.opengroup.org/ for details on the Network | |
193 | * Status Monitor wire protocol. | |
1da177e4 LT |
194 | */ |
195 | ||
099bd05f CL |
196 | static __be32 *xdr_encode_nsm_string(__be32 *p, char *string) |
197 | { | |
198 | size_t len = strlen(string); | |
199 | ||
200 | if (len > SM_MAXSTRLEN) | |
201 | len = SM_MAXSTRLEN; | |
202 | return xdr_encode_opaque(p, string, len); | |
203 | } | |
204 | ||
49695174 CL |
205 | /* |
206 | * "mon_name" specifies the host to be monitored. | |
49695174 CL |
207 | */ |
208 | static __be32 *xdr_encode_mon_name(__be32 *p, struct nsm_args *argp) | |
209 | { | |
29ed1407 | 210 | return xdr_encode_nsm_string(p, argp->mon_name); |
49695174 CL |
211 | } |
212 | ||
850c95fd CL |
213 | /* |
214 | * The "my_id" argument specifies the hostname and RPC procedure | |
215 | * to be called when the status manager receives notification | |
36e8e668 | 216 | * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name" |
850c95fd CL |
217 | * has changed. |
218 | */ | |
219 | static __be32 *xdr_encode_my_id(__be32 *p, struct nsm_args *argp) | |
220 | { | |
221 | p = xdr_encode_nsm_string(p, utsname()->nodename); | |
222 | if (!p) | |
223 | return ERR_PTR(-EIO); | |
224 | ||
225 | *p++ = htonl(argp->prog); | |
226 | *p++ = htonl(argp->vers); | |
227 | *p++ = htonl(argp->proc); | |
228 | ||
229 | return p; | |
230 | } | |
231 | ||
ea72a7f1 CL |
232 | /* |
233 | * The "mon_id" argument specifies the non-private arguments | |
36e8e668 | 234 | * of an NSMPROC_MON or NSMPROC_UNMON call. |
ea72a7f1 CL |
235 | */ |
236 | static __be32 *xdr_encode_mon_id(__be32 *p, struct nsm_args *argp) | |
237 | { | |
238 | p = xdr_encode_mon_name(p, argp); | |
239 | if (!p) | |
240 | return ERR_PTR(-EIO); | |
241 | ||
242 | return xdr_encode_my_id(p, argp); | |
243 | } | |
244 | ||
0490a54a CL |
245 | /* |
246 | * The "priv" argument may contain private information required | |
36e8e668 CL |
247 | * by the NSMPROC_MON call. This information will be supplied in the |
248 | * NLMPROC_SM_NOTIFY call. | |
0490a54a CL |
249 | * |
250 | * Linux provides the raw IP address of the monitored host, | |
251 | * left in network byte order. | |
252 | */ | |
253 | static __be32 *xdr_encode_priv(__be32 *p, struct nsm_args *argp) | |
254 | { | |
255 | *p++ = argp->addr; | |
256 | *p++ = 0; | |
257 | *p++ = 0; | |
258 | *p++ = 0; | |
259 | ||
260 | return p; | |
261 | } | |
262 | ||
1da177e4 | 263 | static int |
52921e02 | 264 | xdr_encode_mon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp) |
1da177e4 | 265 | { |
2ca7754d | 266 | p = xdr_encode_mon_id(p, argp); |
1da177e4 LT |
267 | if (IS_ERR(p)) |
268 | return PTR_ERR(p); | |
9502c522 | 269 | |
0490a54a CL |
270 | p = xdr_encode_priv(p, argp); |
271 | if (IS_ERR(p)) | |
272 | return PTR_ERR(p); | |
273 | ||
1da177e4 LT |
274 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int | |
52921e02 | 279 | xdr_encode_unmon(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp) |
1da177e4 | 280 | { |
2ca7754d | 281 | p = xdr_encode_mon_id(p, argp); |
1da177e4 LT |
282 | if (IS_ERR(p)) |
283 | return PTR_ERR(p); | |
284 | rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p); | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int | |
52921e02 | 289 | xdr_decode_stat_res(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp) |
1da177e4 LT |
290 | { |
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); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static int | |
52921e02 | 299 | xdr_decode_stat(struct rpc_rqst *rqstp, __be32 *p, struct nsm_res *resp) |
1da177e4 LT |
300 | { |
301 | resp->state = ntohl(*p++); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN)) | |
2ca7754d CL |
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) | |
0490a54a CL |
309 | #define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE)) |
310 | #define SM_mon_sz (SM_mon_id_sz+SM_priv_sz) | |
1da177e4 LT |
311 | #define SM_monres_sz 2 |
312 | #define SM_unmonres_sz 1 | |
313 | ||
1da177e4 | 314 | static struct rpc_procinfo nsm_procedures[] = { |
36e8e668 CL |
315 | [NSMPROC_MON] = { |
316 | .p_proc = NSMPROC_MON, | |
1da177e4 LT |
317 | .p_encode = (kxdrproc_t) xdr_encode_mon, |
318 | .p_decode = (kxdrproc_t) xdr_decode_stat_res, | |
2bea90d4 CL |
319 | .p_arglen = SM_mon_sz, |
320 | .p_replen = SM_monres_sz, | |
36e8e668 | 321 | .p_statidx = NSMPROC_MON, |
cc0175c1 | 322 | .p_name = "MONITOR", |
1da177e4 | 323 | }, |
36e8e668 CL |
324 | [NSMPROC_UNMON] = { |
325 | .p_proc = NSMPROC_UNMON, | |
1da177e4 LT |
326 | .p_encode = (kxdrproc_t) xdr_encode_unmon, |
327 | .p_decode = (kxdrproc_t) xdr_decode_stat, | |
2bea90d4 CL |
328 | .p_arglen = SM_mon_id_sz, |
329 | .p_replen = SM_unmonres_sz, | |
36e8e668 | 330 | .p_statidx = NSMPROC_UNMON, |
cc0175c1 | 331 | .p_name = "UNMONITOR", |
1da177e4 LT |
332 | }, |
333 | }; | |
334 | ||
335 | static struct rpc_version nsm_version1 = { | |
e8c96f8c TK |
336 | .number = 1, |
337 | .nrprocs = ARRAY_SIZE(nsm_procedures), | |
1da177e4 LT |
338 | .procs = nsm_procedures |
339 | }; | |
340 | ||
341 | static struct rpc_version * nsm_version[] = { | |
342 | [1] = &nsm_version1, | |
343 | }; | |
344 | ||
345 | static struct rpc_stat nsm_stats; | |
346 | ||
347 | static struct rpc_program nsm_program = { | |
348 | .name = "statd", | |
36e8e668 | 349 | .number = NSM_PROGRAM, |
e8c96f8c | 350 | .nrvers = ARRAY_SIZE(nsm_version), |
1da177e4 LT |
351 | .version = nsm_version, |
352 | .stats = &nsm_stats | |
353 | }; |