blob: e3015464fbab8ac1a9a48f0ea5465080923731bb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Chuck Lever94da7662008-12-11 17:56:07 -050012#include <linux/ktime.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Chuck Lever94da7662008-12-11 17:56:07 -050014
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/clnt.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040016#include <linux/sunrpc/xprtsock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/sunrpc/svc.h>
18#include <linux/lockd/lockd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Mans Rullgardad5b3652009-03-28 19:55:20 +000020#include <asm/unaligned.h>
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#define NLMDBG_FACILITY NLMDBG_MONITOR
Chuck Lever36e8e662008-12-05 19:02:07 -050023#define NSM_PROGRAM 100024
24#define NSM_VERSION 1
25
26enum {
27 NSMPROC_NULL,
28 NSMPROC_STAT,
29 NSMPROC_MON,
30 NSMPROC_UNMON,
31 NSMPROC_UNMON_ALL,
32 NSMPROC_SIMU_CRASH,
33 NSMPROC_NOTIFY,
34};
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Chuck Lever9c1bfd02008-12-05 19:01:59 -050036struct nsm_args {
Chuck Levercab2d3c2008-12-05 19:03:24 -050037 struct nsm_private *priv;
Chuck Lever9c1bfd02008-12-05 19:01:59 -050038 u32 prog; /* RPC callback info */
39 u32 vers;
40 u32 proc;
41
42 char *mon_name;
43};
44
45struct nsm_res {
46 u32 status;
47 u32 state;
48};
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static struct rpc_program nsm_program;
Chuck Lever67c6d102008-12-05 19:02:45 -050051static LIST_HEAD(nsm_handles);
52static DEFINE_SPINLOCK(nsm_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/*
55 * Local NSM state
56 */
Chuck Lever6c9dc422009-06-17 18:02:10 -070057u32 __read_mostly nsm_local_state;
Chuck Leverb7ba5972008-12-11 17:56:29 -050058int __read_mostly nsm_use_hostnames;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Chuck Lever8529bc52008-12-11 17:56:22 -050060static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
61{
62 return (struct sockaddr *)&nsm->sm_addr;
63}
64
Chuck Lever49b56992008-12-11 17:56:37 -050065static struct rpc_clnt *nsm_create(void)
66{
67 struct sockaddr_in sin = {
68 .sin_family = AF_INET,
69 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
70 };
71 struct rpc_create_args args = {
72 .protocol = XPRT_TRANSPORT_UDP,
73 .address = (struct sockaddr *)&sin,
74 .addrsize = sizeof(sin),
75 .servername = "rpc.statd",
76 .program = &nsm_program,
77 .version = NSM_VERSION,
78 .authflavor = RPC_AUTH_NULL,
Chuck Lever0e5c2632009-06-17 18:02:11 -070079 .flags = RPC_CLNT_CREATE_NOPING,
Chuck Lever49b56992008-12-11 17:56:37 -050080 };
81
82 return rpc_create(&args);
83}
84
85static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
87 struct rpc_clnt *clnt;
88 int status;
Chuck Levera4846752008-12-04 14:20:23 -050089 struct nsm_args args = {
Chuck Levercab2d3c2008-12-05 19:03:24 -050090 .priv = &nsm->sm_priv,
Chuck Levera4846752008-12-04 14:20:23 -050091 .prog = NLM_PROGRAM,
92 .vers = 3,
93 .proc = NLMPROC_NSM_NOTIFY,
Chuck Lever29ed1402008-12-04 14:20:46 -050094 .mon_name = nsm->sm_mon_name,
Chuck Levera4846752008-12-04 14:20:23 -050095 };
Chuck Leverdead28d2006-03-20 13:44:23 -050096 struct rpc_message msg = {
97 .rpc_argp = &args,
98 .rpc_resp = res,
99 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 clnt = nsm_create();
102 if (IS_ERR(clnt)) {
103 status = PTR_ERR(clnt);
Chuck Lever5acf4312008-12-04 14:20:31 -0500104 dprintk("lockd: failed to create NSM upcall transport, "
105 "status=%d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 goto out;
107 }
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 memset(res, 0, sizeof(*res));
110
Chuck Leverdead28d2006-03-20 13:44:23 -0500111 msg.rpc_proc = &clnt->cl_procinfo[proc];
112 status = rpc_call_sync(clnt, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 if (status < 0)
Chuck Lever5acf4312008-12-04 14:20:31 -0500114 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
115 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 else
117 status = 0;
Trond Myklebust90c57552007-06-09 19:49:36 -0400118 rpc_shutdown_client(clnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 out:
120 return status;
121}
122
Chuck Lever1e49323c2008-12-04 14:21:24 -0500123/**
124 * nsm_monitor - Notify a peer in case we reboot
125 * @host: pointer to nlm_host of peer to notify
126 *
127 * If this peer is not already monitored, this function sends an
128 * upcall to the local rpc.statd to record the name/address of
129 * the peer to notify in case we reboot.
130 *
131 * Returns zero if the peer is monitored by the local rpc.statd;
132 * otherwise a negative errno value is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 */
Chuck Lever1e49323c2008-12-04 14:21:24 -0500134int nsm_monitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700136 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 struct nsm_res res;
138 int status;
139
Chuck Lever9fee4902008-12-04 14:20:53 -0500140 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700141
142 if (nsm->sm_monitored)
Olaf Kirch977faf32006-10-04 02:15:51 -0700143 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Chuck Lever29ed1402008-12-04 14:20:46 -0500145 /*
146 * Choose whether to record the caller_name or IP address of
147 * this peer in the local rpc.statd's database.
148 */
149 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
150
Chuck Lever36e8e662008-12-05 19:02:07 -0500151 status = nsm_mon_unmon(nsm, NSMPROC_MON, &res);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700152 if (unlikely(res.status != 0))
Chuck Lever5d254b12008-12-04 14:21:15 -0500153 status = -EIO;
Chuck Lever6c9dc422009-06-17 18:02:10 -0700154 if (unlikely(status < 0)) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500155 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700156 return status;
157 }
158
159 nsm->sm_monitored = 1;
160 if (unlikely(nsm_local_state != res.state)) {
161 nsm_local_state = res.state;
162 dprintk("lockd: NSM state changed to %d\n", nsm_local_state);
163 }
164 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
166
Chuck Lever356c3eb2008-12-04 14:21:38 -0500167/**
168 * nsm_unmonitor - Unregister peer notification
169 * @host: pointer to nlm_host of peer to stop monitoring
170 *
171 * If this peer is monitored, this function sends an upcall to
172 * tell the local rpc.statd not to send this peer a notification
173 * when we reboot.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 */
Chuck Lever356c3eb2008-12-04 14:21:38 -0500175void nsm_unmonitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700177 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 struct nsm_res res;
Chuck Lever356c3eb2008-12-04 14:21:38 -0500179 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Olaf Kirch9502c522006-10-04 02:15:56 -0700181 if (atomic_read(&nsm->sm_count) == 1
182 && nsm->sm_monitored && !nsm->sm_sticky) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500183 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700184
Chuck Lever36e8e662008-12-05 19:02:07 -0500185 status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res);
Chuck Lever0c7aef42008-12-04 14:21:46 -0500186 if (res.status != 0)
187 status = -EIO;
Olaf Kirch977faf32006-10-04 02:15:51 -0700188 if (status < 0)
Olaf Kirch9502c522006-10-04 02:15:56 -0700189 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
Chuck Lever9fee4902008-12-04 14:20:53 -0500190 nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700191 else
192 nsm->sm_monitored = 0;
Olaf Kirch977faf32006-10-04 02:15:51 -0700193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
Chuck Lever3420a8c2008-12-05 19:03:46 -0500196static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
197 const size_t len)
198{
199 struct nsm_handle *nsm;
200
201 list_for_each_entry(nsm, &nsm_handles, sm_link)
202 if (strlen(nsm->sm_name) == len &&
203 memcmp(nsm->sm_name, hostname, len) == 0)
204 return nsm;
205 return NULL;
206}
207
Chuck Lever77a3ef32008-12-11 17:55:59 -0500208static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
209{
210 struct nsm_handle *nsm;
211
212 list_for_each_entry(nsm, &nsm_handles, sm_link)
Jeff Layton4516fc02009-08-14 12:57:54 -0400213 if (rpc_cmp_addr(nsm_addr(nsm), sap))
Chuck Lever77a3ef32008-12-11 17:55:59 -0500214 return nsm;
215 return NULL;
216}
217
Chuck Lever3420a8c2008-12-05 19:03:46 -0500218static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
219{
220 struct nsm_handle *nsm;
221
222 list_for_each_entry(nsm, &nsm_handles, sm_link)
223 if (memcmp(nsm->sm_priv.data, priv->data,
224 sizeof(priv->data)) == 0)
225 return nsm;
226 return NULL;
227}
228
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500229/*
230 * Construct a unique cookie to match this nsm_handle to this monitored
231 * host. It is passed to the local rpc.statd via NSMPROC_MON, and
232 * returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
233 * requests.
234 *
Chuck Lever94da7662008-12-11 17:56:07 -0500235 * The NSM protocol requires that these cookies be unique while the
236 * system is running. We prefer a stronger requirement of making them
237 * unique across reboots. If user space bugs cause a stale cookie to
238 * be sent to the kernel, it could cause the wrong host to lose its
239 * lock state if cookies were not unique across reboots.
240 *
241 * The cookies are exposed only to local user space via loopback. They
242 * do not appear on the physical network. If we want greater security
243 * for some reason, nsm_init_private() could perform a one-way hash to
244 * obscure the contents of the cookie.
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500245 */
246static void nsm_init_private(struct nsm_handle *nsm)
247{
Chuck Lever94da7662008-12-11 17:56:07 -0500248 u64 *p = (u64 *)&nsm->sm_priv.data;
249 struct timespec ts;
Mans Rullgardad5b3652009-03-28 19:55:20 +0000250 s64 ns;
Chuck Lever94da7662008-12-11 17:56:07 -0500251
252 ktime_get_ts(&ts);
Mans Rullgardad5b3652009-03-28 19:55:20 +0000253 ns = timespec_to_ns(&ts);
254 put_unaligned(ns, p);
255 put_unaligned((unsigned long)nsm, p + 1);
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500256}
257
Chuck Leverb39b8972008-12-11 17:55:52 -0500258static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
259 const size_t salen,
260 const char *hostname,
261 const size_t hostname_len)
262{
263 struct nsm_handle *new;
264
265 new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
266 if (unlikely(new == NULL))
267 return NULL;
268
269 atomic_set(&new->sm_count, 1);
270 new->sm_name = (char *)(new + 1);
271 memcpy(nsm_addr(new), sap, salen);
272 new->sm_addrlen = salen;
273 nsm_init_private(new);
Chuck Leverc15128c2009-08-09 15:09:39 -0400274
275 if (rpc_ntop(nsm_addr(new), new->sm_addrbuf,
276 sizeof(new->sm_addrbuf)) == 0)
277 (void)snprintf(new->sm_addrbuf, sizeof(new->sm_addrbuf),
278 "unsupported address family");
Chuck Leverb39b8972008-12-11 17:55:52 -0500279 memcpy(new->sm_name, hostname, hostname_len);
280 new->sm_name[hostname_len] = '\0';
281
282 return new;
283}
284
Chuck Lever67c6d102008-12-05 19:02:45 -0500285/**
Chuck Lever92fd91b2008-12-05 19:04:01 -0500286 * nsm_get_handle - Find or create a cached nsm_handle
Chuck Lever67c6d102008-12-05 19:02:45 -0500287 * @sap: pointer to socket address of handle to find
288 * @salen: length of socket address
289 * @hostname: pointer to C string containing hostname to find
290 * @hostname_len: length of C string
Chuck Lever67c6d102008-12-05 19:02:45 -0500291 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500292 * Behavior is modulated by the global nsm_use_hostnames variable.
Chuck Lever67c6d102008-12-05 19:02:45 -0500293 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500294 * Returns a cached nsm_handle after bumping its ref count, or
295 * returns a fresh nsm_handle if a handle that matches @sap and/or
296 * @hostname cannot be found in the handle cache. Returns NULL if
297 * an error occurs.
Chuck Lever67c6d102008-12-05 19:02:45 -0500298 */
Chuck Lever92fd91b2008-12-05 19:04:01 -0500299struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
300 const size_t salen, const char *hostname,
301 const size_t hostname_len)
Chuck Lever67c6d102008-12-05 19:02:45 -0500302{
Chuck Lever77a3ef32008-12-11 17:55:59 -0500303 struct nsm_handle *cached, *new = NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500304
Chuck Lever67c6d102008-12-05 19:02:45 -0500305 if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
306 if (printk_ratelimit()) {
307 printk(KERN_WARNING "Invalid hostname \"%.*s\" "
308 "in NFS lock request\n",
309 (int)hostname_len, hostname);
310 }
311 return NULL;
312 }
313
314retry:
315 spin_lock(&nsm_lock);
Chuck Lever67c6d102008-12-05 19:02:45 -0500316
Chuck Lever77a3ef32008-12-11 17:55:59 -0500317 if (nsm_use_hostnames && hostname != NULL)
318 cached = nsm_lookup_hostname(hostname, hostname_len);
319 else
320 cached = nsm_lookup_addr(sap);
321
322 if (cached != NULL) {
323 atomic_inc(&cached->sm_count);
324 spin_unlock(&nsm_lock);
325 kfree(new);
326 dprintk("lockd: found nsm_handle for %s (%s), "
327 "cnt %d\n", cached->sm_name,
328 cached->sm_addrbuf,
329 atomic_read(&cached->sm_count));
330 return cached;
Chuck Lever67c6d102008-12-05 19:02:45 -0500331 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500332
333 if (new != NULL) {
334 list_add(&new->sm_link, &nsm_handles);
335 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500336 dprintk("lockd: created nsm_handle for %s (%s)\n",
Chuck Lever77a3ef32008-12-11 17:55:59 -0500337 new->sm_name, new->sm_addrbuf);
338 return new;
Chuck Lever67c6d102008-12-05 19:02:45 -0500339 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500340
Chuck Lever67c6d102008-12-05 19:02:45 -0500341 spin_unlock(&nsm_lock);
342
Chuck Lever77a3ef32008-12-11 17:55:59 -0500343 new = nsm_create_handle(sap, salen, hostname, hostname_len);
344 if (unlikely(new == NULL))
Chuck Lever67c6d102008-12-05 19:02:45 -0500345 return NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500346 goto retry;
Chuck Lever67c6d102008-12-05 19:02:45 -0500347}
348
349/**
Chuck Lever3420a8c2008-12-05 19:03:46 -0500350 * nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
351 * @info: pointer to NLMPROC_SM_NOTIFY arguments
352 *
Jeff Layton7e469af2010-02-05 15:09:22 -0500353 * Returns a matching nsm_handle if found in the nsm cache. The returned
354 * nsm_handle's reference count is bumped. Otherwise returns NULL if some
355 * error occurred.
Chuck Lever3420a8c2008-12-05 19:03:46 -0500356 */
357struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
358{
359 struct nsm_handle *cached;
360
361 spin_lock(&nsm_lock);
362
Chuck Lever94da7662008-12-11 17:56:07 -0500363 cached = nsm_lookup_priv(&info->priv);
Chuck Lever3420a8c2008-12-05 19:03:46 -0500364 if (unlikely(cached == NULL)) {
365 spin_unlock(&nsm_lock);
366 dprintk("lockd: never saw rebooted peer '%.*s' before\n",
367 info->len, info->mon);
368 return cached;
369 }
370
371 atomic_inc(&cached->sm_count);
372 spin_unlock(&nsm_lock);
373
Chuck Lever3420a8c2008-12-05 19:03:46 -0500374 dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
375 cached->sm_name, cached->sm_addrbuf,
376 atomic_read(&cached->sm_count));
377 return cached;
378}
379
380/**
Chuck Lever67c6d102008-12-05 19:02:45 -0500381 * nsm_release - Release an NSM handle
382 * @nsm: pointer to handle to be released
383 *
384 */
385void nsm_release(struct nsm_handle *nsm)
386{
Chuck Lever67c6d102008-12-05 19:02:45 -0500387 if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
388 list_del(&nsm->sm_link);
389 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500390 dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
391 nsm->sm_name, nsm->sm_addrbuf);
Chuck Lever67c6d102008-12-05 19:02:45 -0500392 kfree(nsm);
393 }
394}
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 * XDR functions for NSM.
Chuck Lever2ca77542008-03-14 14:26:01 -0400398 *
399 * See http://www.opengroup.org/ for details on the Network
400 * Status Monitor wire protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 */
402
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500403static int encode_nsm_string(struct xdr_stream *xdr, const char *string)
Chuck Lever099bd052008-03-14 14:25:32 -0400404{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500405 const u32 len = strlen(string);
406 __be32 *p;
Chuck Lever099bd052008-03-14 14:25:32 -0400407
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500408 if (unlikely(len > SM_MAXSTRLEN))
409 return -EIO;
410 p = xdr_reserve_space(xdr, sizeof(u32) + len);
411 if (unlikely(p == NULL))
412 return -EIO;
413 xdr_encode_opaque(p, string, len);
414 return 0;
Chuck Lever099bd052008-03-14 14:25:32 -0400415}
416
Chuck Lever49695172008-03-14 14:25:39 -0400417/*
418 * "mon_name" specifies the host to be monitored.
Chuck Lever49695172008-03-14 14:25:39 -0400419 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500420static int encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever49695172008-03-14 14:25:39 -0400421{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500422 return encode_nsm_string(xdr, argp->mon_name);
Chuck Lever49695172008-03-14 14:25:39 -0400423}
424
Chuck Lever850c95f2008-03-14 14:25:46 -0400425/*
426 * The "my_id" argument specifies the hostname and RPC procedure
427 * to be called when the status manager receives notification
Chuck Lever36e8e662008-12-05 19:02:07 -0500428 * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
Chuck Lever850c95f2008-03-14 14:25:46 -0400429 * has changed.
430 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500431static int encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever850c95f2008-03-14 14:25:46 -0400432{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500433 int status;
434 __be32 *p;
Chuck Lever850c95f2008-03-14 14:25:46 -0400435
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500436 status = encode_nsm_string(xdr, utsname()->nodename);
437 if (unlikely(status != 0))
438 return status;
439 p = xdr_reserve_space(xdr, 3 * sizeof(u32));
440 if (unlikely(p == NULL))
441 return -EIO;
Chuck Lever850c95f2008-03-14 14:25:46 -0400442 *p++ = htonl(argp->prog);
443 *p++ = htonl(argp->vers);
444 *p++ = htonl(argp->proc);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500445 return 0;
Chuck Lever850c95f2008-03-14 14:25:46 -0400446}
447
Chuck Leverea72a7f2008-03-14 14:25:53 -0400448/*
449 * The "mon_id" argument specifies the non-private arguments
Chuck Lever36e8e662008-12-05 19:02:07 -0500450 * of an NSMPROC_MON or NSMPROC_UNMON call.
Chuck Leverea72a7f2008-03-14 14:25:53 -0400451 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500452static int encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Leverea72a7f2008-03-14 14:25:53 -0400453{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500454 int status;
Chuck Leverea72a7f2008-03-14 14:25:53 -0400455
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500456 status = encode_mon_name(xdr, argp);
457 if (unlikely(status != 0))
458 return status;
459 return encode_my_id(xdr, argp);
Chuck Leverea72a7f2008-03-14 14:25:53 -0400460}
461
Chuck Lever0490a542008-03-14 14:26:08 -0400462/*
463 * The "priv" argument may contain private information required
Chuck Lever36e8e662008-12-05 19:02:07 -0500464 * by the NSMPROC_MON call. This information will be supplied in the
465 * NLMPROC_SM_NOTIFY call.
Chuck Lever0490a542008-03-14 14:26:08 -0400466 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500467static int encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever0490a542008-03-14 14:26:08 -0400468{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500469 __be32 *p;
470
471 p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
472 if (unlikely(p == NULL))
473 return -EIO;
Chuck Levercab2d3c2008-12-05 19:03:24 -0500474 xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 return 0;
476}
477
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500478static int xdr_enc_mon(struct rpc_rqst *req, __be32 *p,
479 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500481 struct xdr_stream xdr;
482 int status;
483
484 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
485 status = encode_mon_id(&xdr, argp);
486 if (unlikely(status))
487 return status;
488 return encode_priv(&xdr, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489}
490
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500491static int xdr_enc_unmon(struct rpc_rqst *req, __be32 *p,
492 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500494 struct xdr_stream xdr;
495
496 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
497 return encode_mon_id(&xdr, argp);
498}
499
500static int xdr_dec_stat_res(struct rpc_rqst *rqstp, __be32 *p,
501 struct nsm_res *resp)
502{
503 struct xdr_stream xdr;
504
505 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
506 p = xdr_inline_decode(&xdr, 2 * sizeof(u32));
507 if (unlikely(p == NULL))
508 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 resp->status = ntohl(*p++);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500510 resp->state = ntohl(*p);
511
512 dprintk("lockd: xdr_dec_stat_res status %d state %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 resp->status, resp->state);
514 return 0;
515}
516
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500517static int xdr_dec_stat(struct rpc_rqst *rqstp, __be32 *p,
518 struct nsm_res *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500520 struct xdr_stream xdr;
521
522 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
523 p = xdr_inline_decode(&xdr, sizeof(u32));
524 if (unlikely(p == NULL))
525 return -EIO;
526 resp->state = ntohl(*p);
527
528 dprintk("lockd: xdr_dec_stat state %d\n", resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 return 0;
530}
531
532#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
Chuck Lever2ca77542008-03-14 14:26:01 -0400533#define SM_my_id_sz (SM_my_name_sz+3)
534#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
535#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
Chuck Lever0490a542008-03-14 14:26:08 -0400536#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
537#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538#define SM_monres_sz 2
539#define SM_unmonres_sz 1
540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541static struct rpc_procinfo nsm_procedures[] = {
Chuck Lever36e8e662008-12-05 19:02:07 -0500542[NSMPROC_MON] = {
543 .p_proc = NSMPROC_MON,
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500544 .p_encode = (kxdrproc_t)xdr_enc_mon,
545 .p_decode = (kxdrproc_t)xdr_dec_stat_res,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400546 .p_arglen = SM_mon_sz,
547 .p_replen = SM_monres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500548 .p_statidx = NSMPROC_MON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500549 .p_name = "MONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 },
Chuck Lever36e8e662008-12-05 19:02:07 -0500551[NSMPROC_UNMON] = {
552 .p_proc = NSMPROC_UNMON,
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500553 .p_encode = (kxdrproc_t)xdr_enc_unmon,
554 .p_decode = (kxdrproc_t)xdr_dec_stat,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400555 .p_arglen = SM_mon_id_sz,
556 .p_replen = SM_unmonres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500557 .p_statidx = NSMPROC_UNMON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500558 .p_name = "UNMONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 },
560};
561
562static struct rpc_version nsm_version1 = {
Tobias Klausere8c96f82006-03-24 03:15:34 -0800563 .number = 1,
564 .nrprocs = ARRAY_SIZE(nsm_procedures),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 .procs = nsm_procedures
566};
567
568static struct rpc_version * nsm_version[] = {
569 [1] = &nsm_version1,
570};
571
572static struct rpc_stat nsm_stats;
573
574static struct rpc_program nsm_program = {
575 .name = "statd",
Chuck Lever36e8e662008-12-05 19:02:07 -0500576 .number = NSM_PROGRAM,
Tobias Klausere8c96f82006-03-24 03:15:34 -0800577 .nrvers = ARRAY_SIZE(nsm_version),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 .version = nsm_version,
579 .stats = &nsm_stats
580};