blob: 7fce1b525849d2ca83c056ed08565d1161de3a92 [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>
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/sunrpc/clnt.h>
\"Talpey, Thomas\0896a722007-09-10 13:48:23 -040015#include <linux/sunrpc/xprtsock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/sunrpc/svc.h>
17#include <linux/lockd/lockd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Mans Rullgardad5b3652009-03-28 19:55:20 +000019#include <asm/unaligned.h>
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#define NLMDBG_FACILITY NLMDBG_MONITOR
Chuck Lever36e8e662008-12-05 19:02:07 -050022#define NSM_PROGRAM 100024
23#define NSM_VERSION 1
24
25enum {
26 NSMPROC_NULL,
27 NSMPROC_STAT,
28 NSMPROC_MON,
29 NSMPROC_UNMON,
30 NSMPROC_UNMON_ALL,
31 NSMPROC_SIMU_CRASH,
32 NSMPROC_NOTIFY,
33};
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Chuck Lever9c1bfd02008-12-05 19:01:59 -050035struct nsm_args {
Chuck Levercab2d3c2008-12-05 19:03:24 -050036 struct nsm_private *priv;
Chuck Lever9c1bfd02008-12-05 19:01:59 -050037 u32 prog; /* RPC callback info */
38 u32 vers;
39 u32 proc;
40
41 char *mon_name;
42};
43
44struct nsm_res {
45 u32 status;
46 u32 state;
47};
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049static struct rpc_program nsm_program;
Chuck Lever67c6d102008-12-05 19:02:45 -050050static LIST_HEAD(nsm_handles);
51static DEFINE_SPINLOCK(nsm_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/*
54 * Local NSM state
55 */
Chuck Lever6c9dc422009-06-17 18:02:10 -070056u32 __read_mostly nsm_local_state;
Chuck Leverb7ba5972008-12-11 17:56:29 -050057int __read_mostly nsm_use_hostnames;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Chuck Lever8529bc52008-12-11 17:56:22 -050059static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
60{
61 return (struct sockaddr *)&nsm->sm_addr;
62}
63
Chuck Lever67c6d102008-12-05 19:02:45 -050064static void nsm_display_ipv4_address(const struct sockaddr *sap, char *buf,
65 const size_t len)
66{
67 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
68 snprintf(buf, len, "%pI4", &sin->sin_addr.s_addr);
69}
70
71static void nsm_display_ipv6_address(const struct sockaddr *sap, char *buf,
72 const size_t len)
73{
74 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
75
76 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
77 snprintf(buf, len, "%pI4", &sin6->sin6_addr.s6_addr32[3]);
78 else if (sin6->sin6_scope_id != 0)
79 snprintf(buf, len, "%pI6%%%u", &sin6->sin6_addr,
80 sin6->sin6_scope_id);
81 else
82 snprintf(buf, len, "%pI6", &sin6->sin6_addr);
83}
84
85static void nsm_display_address(const struct sockaddr *sap,
86 char *buf, const size_t len)
87{
88 switch (sap->sa_family) {
89 case AF_INET:
90 nsm_display_ipv4_address(sap, buf, len);
91 break;
92 case AF_INET6:
93 nsm_display_ipv6_address(sap, buf, len);
94 break;
95 default:
96 snprintf(buf, len, "unsupported address family");
97 break;
98 }
99}
100
Chuck Lever49b56992008-12-11 17:56:37 -0500101static struct rpc_clnt *nsm_create(void)
102{
103 struct sockaddr_in sin = {
104 .sin_family = AF_INET,
105 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
106 };
107 struct rpc_create_args args = {
108 .protocol = XPRT_TRANSPORT_UDP,
109 .address = (struct sockaddr *)&sin,
110 .addrsize = sizeof(sin),
111 .servername = "rpc.statd",
112 .program = &nsm_program,
113 .version = NSM_VERSION,
114 .authflavor = RPC_AUTH_NULL,
Chuck Lever0e5c2632009-06-17 18:02:11 -0700115 .flags = RPC_CLNT_CREATE_NOPING,
Chuck Lever49b56992008-12-11 17:56:37 -0500116 };
117
118 return rpc_create(&args);
119}
120
121static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
123 struct rpc_clnt *clnt;
124 int status;
Chuck Levera4846752008-12-04 14:20:23 -0500125 struct nsm_args args = {
Chuck Levercab2d3c2008-12-05 19:03:24 -0500126 .priv = &nsm->sm_priv,
Chuck Levera4846752008-12-04 14:20:23 -0500127 .prog = NLM_PROGRAM,
128 .vers = 3,
129 .proc = NLMPROC_NSM_NOTIFY,
Chuck Lever29ed1402008-12-04 14:20:46 -0500130 .mon_name = nsm->sm_mon_name,
Chuck Levera4846752008-12-04 14:20:23 -0500131 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500132 struct rpc_message msg = {
133 .rpc_argp = &args,
134 .rpc_resp = res,
135 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 clnt = nsm_create();
138 if (IS_ERR(clnt)) {
139 status = PTR_ERR(clnt);
Chuck Lever5acf4312008-12-04 14:20:31 -0500140 dprintk("lockd: failed to create NSM upcall transport, "
141 "status=%d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 goto out;
143 }
144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 memset(res, 0, sizeof(*res));
146
Chuck Leverdead28d2006-03-20 13:44:23 -0500147 msg.rpc_proc = &clnt->cl_procinfo[proc];
148 status = rpc_call_sync(clnt, &msg, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 if (status < 0)
Chuck Lever5acf4312008-12-04 14:20:31 -0500150 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
151 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 else
153 status = 0;
Trond Myklebust90c57552007-06-09 19:49:36 -0400154 rpc_shutdown_client(clnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 out:
156 return status;
157}
158
Chuck Lever1e493232008-12-04 14:21:24 -0500159/**
160 * nsm_monitor - Notify a peer in case we reboot
161 * @host: pointer to nlm_host of peer to notify
162 *
163 * If this peer is not already monitored, this function sends an
164 * upcall to the local rpc.statd to record the name/address of
165 * the peer to notify in case we reboot.
166 *
167 * Returns zero if the peer is monitored by the local rpc.statd;
168 * otherwise a negative errno value is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 */
Chuck Lever1e493232008-12-04 14:21:24 -0500170int nsm_monitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700172 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 struct nsm_res res;
174 int status;
175
Chuck Lever9fee4902008-12-04 14:20:53 -0500176 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700177
178 if (nsm->sm_monitored)
Olaf Kirch977faf32006-10-04 02:15:51 -0700179 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Chuck Lever29ed1402008-12-04 14:20:46 -0500181 /*
182 * Choose whether to record the caller_name or IP address of
183 * this peer in the local rpc.statd's database.
184 */
185 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
186
Chuck Lever36e8e662008-12-05 19:02:07 -0500187 status = nsm_mon_unmon(nsm, NSMPROC_MON, &res);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700188 if (unlikely(res.status != 0))
Chuck Lever5d254b12008-12-04 14:21:15 -0500189 status = -EIO;
Chuck Lever6c9dc422009-06-17 18:02:10 -0700190 if (unlikely(status < 0)) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500191 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700192 return status;
193 }
194
195 nsm->sm_monitored = 1;
196 if (unlikely(nsm_local_state != res.state)) {
197 nsm_local_state = res.state;
198 dprintk("lockd: NSM state changed to %d\n", nsm_local_state);
199 }
200 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
Chuck Lever356c3eb2008-12-04 14:21:38 -0500203/**
204 * nsm_unmonitor - Unregister peer notification
205 * @host: pointer to nlm_host of peer to stop monitoring
206 *
207 * If this peer is monitored, this function sends an upcall to
208 * tell the local rpc.statd not to send this peer a notification
209 * when we reboot.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 */
Chuck Lever356c3eb2008-12-04 14:21:38 -0500211void nsm_unmonitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700213 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 struct nsm_res res;
Chuck Lever356c3eb2008-12-04 14:21:38 -0500215 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Olaf Kirch9502c522006-10-04 02:15:56 -0700217 if (atomic_read(&nsm->sm_count) == 1
218 && nsm->sm_monitored && !nsm->sm_sticky) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500219 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700220
Chuck Lever36e8e662008-12-05 19:02:07 -0500221 status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res);
Chuck Lever0c7aef42008-12-04 14:21:46 -0500222 if (res.status != 0)
223 status = -EIO;
Olaf Kirch977faf32006-10-04 02:15:51 -0700224 if (status < 0)
Olaf Kirch9502c522006-10-04 02:15:56 -0700225 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
Chuck Lever9fee4902008-12-04 14:20:53 -0500226 nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700227 else
228 nsm->sm_monitored = 0;
Olaf Kirch977faf32006-10-04 02:15:51 -0700229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
Chuck Lever3420a8c2008-12-05 19:03:46 -0500232static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
233 const size_t len)
234{
235 struct nsm_handle *nsm;
236
237 list_for_each_entry(nsm, &nsm_handles, sm_link)
238 if (strlen(nsm->sm_name) == len &&
239 memcmp(nsm->sm_name, hostname, len) == 0)
240 return nsm;
241 return NULL;
242}
243
Chuck Lever77a3ef32008-12-11 17:55:59 -0500244static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
245{
246 struct nsm_handle *nsm;
247
248 list_for_each_entry(nsm, &nsm_handles, sm_link)
249 if (nlm_cmp_addr(nsm_addr(nsm), sap))
250 return nsm;
251 return NULL;
252}
253
Chuck Lever3420a8c2008-12-05 19:03:46 -0500254static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
255{
256 struct nsm_handle *nsm;
257
258 list_for_each_entry(nsm, &nsm_handles, sm_link)
259 if (memcmp(nsm->sm_priv.data, priv->data,
260 sizeof(priv->data)) == 0)
261 return nsm;
262 return NULL;
263}
264
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500265/*
266 * Construct a unique cookie to match this nsm_handle to this monitored
267 * host. It is passed to the local rpc.statd via NSMPROC_MON, and
268 * returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
269 * requests.
270 *
Chuck Lever94da7662008-12-11 17:56:07 -0500271 * The NSM protocol requires that these cookies be unique while the
272 * system is running. We prefer a stronger requirement of making them
273 * unique across reboots. If user space bugs cause a stale cookie to
274 * be sent to the kernel, it could cause the wrong host to lose its
275 * lock state if cookies were not unique across reboots.
276 *
277 * The cookies are exposed only to local user space via loopback. They
278 * do not appear on the physical network. If we want greater security
279 * for some reason, nsm_init_private() could perform a one-way hash to
280 * obscure the contents of the cookie.
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500281 */
282static void nsm_init_private(struct nsm_handle *nsm)
283{
Chuck Lever94da7662008-12-11 17:56:07 -0500284 u64 *p = (u64 *)&nsm->sm_priv.data;
285 struct timespec ts;
Mans Rullgardad5b3652009-03-28 19:55:20 +0000286 s64 ns;
Chuck Lever94da7662008-12-11 17:56:07 -0500287
288 ktime_get_ts(&ts);
Mans Rullgardad5b3652009-03-28 19:55:20 +0000289 ns = timespec_to_ns(&ts);
290 put_unaligned(ns, p);
291 put_unaligned((unsigned long)nsm, p + 1);
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500292}
293
Chuck Leverb39b8972008-12-11 17:55:52 -0500294static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
295 const size_t salen,
296 const char *hostname,
297 const size_t hostname_len)
298{
299 struct nsm_handle *new;
300
301 new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
302 if (unlikely(new == NULL))
303 return NULL;
304
305 atomic_set(&new->sm_count, 1);
306 new->sm_name = (char *)(new + 1);
307 memcpy(nsm_addr(new), sap, salen);
308 new->sm_addrlen = salen;
309 nsm_init_private(new);
310 nsm_display_address((const struct sockaddr *)&new->sm_addr,
311 new->sm_addrbuf, sizeof(new->sm_addrbuf));
312 memcpy(new->sm_name, hostname, hostname_len);
313 new->sm_name[hostname_len] = '\0';
314
315 return new;
316}
317
Chuck Lever67c6d102008-12-05 19:02:45 -0500318/**
Chuck Lever92fd91b2008-12-05 19:04:01 -0500319 * nsm_get_handle - Find or create a cached nsm_handle
Chuck Lever67c6d102008-12-05 19:02:45 -0500320 * @sap: pointer to socket address of handle to find
321 * @salen: length of socket address
322 * @hostname: pointer to C string containing hostname to find
323 * @hostname_len: length of C string
Chuck Lever67c6d102008-12-05 19:02:45 -0500324 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500325 * Behavior is modulated by the global nsm_use_hostnames variable.
Chuck Lever67c6d102008-12-05 19:02:45 -0500326 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500327 * Returns a cached nsm_handle after bumping its ref count, or
328 * returns a fresh nsm_handle if a handle that matches @sap and/or
329 * @hostname cannot be found in the handle cache. Returns NULL if
330 * an error occurs.
Chuck Lever67c6d102008-12-05 19:02:45 -0500331 */
Chuck Lever92fd91b2008-12-05 19:04:01 -0500332struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
333 const size_t salen, const char *hostname,
334 const size_t hostname_len)
Chuck Lever67c6d102008-12-05 19:02:45 -0500335{
Chuck Lever77a3ef32008-12-11 17:55:59 -0500336 struct nsm_handle *cached, *new = NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500337
Chuck Lever67c6d102008-12-05 19:02:45 -0500338 if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
339 if (printk_ratelimit()) {
340 printk(KERN_WARNING "Invalid hostname \"%.*s\" "
341 "in NFS lock request\n",
342 (int)hostname_len, hostname);
343 }
344 return NULL;
345 }
346
347retry:
348 spin_lock(&nsm_lock);
Chuck Lever67c6d102008-12-05 19:02:45 -0500349
Chuck Lever77a3ef32008-12-11 17:55:59 -0500350 if (nsm_use_hostnames && hostname != NULL)
351 cached = nsm_lookup_hostname(hostname, hostname_len);
352 else
353 cached = nsm_lookup_addr(sap);
354
355 if (cached != NULL) {
356 atomic_inc(&cached->sm_count);
357 spin_unlock(&nsm_lock);
358 kfree(new);
359 dprintk("lockd: found nsm_handle for %s (%s), "
360 "cnt %d\n", cached->sm_name,
361 cached->sm_addrbuf,
362 atomic_read(&cached->sm_count));
363 return cached;
Chuck Lever67c6d102008-12-05 19:02:45 -0500364 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500365
366 if (new != NULL) {
367 list_add(&new->sm_link, &nsm_handles);
368 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500369 dprintk("lockd: created nsm_handle for %s (%s)\n",
Chuck Lever77a3ef32008-12-11 17:55:59 -0500370 new->sm_name, new->sm_addrbuf);
371 return new;
Chuck Lever67c6d102008-12-05 19:02:45 -0500372 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500373
Chuck Lever67c6d102008-12-05 19:02:45 -0500374 spin_unlock(&nsm_lock);
375
Chuck Lever77a3ef32008-12-11 17:55:59 -0500376 new = nsm_create_handle(sap, salen, hostname, hostname_len);
377 if (unlikely(new == NULL))
Chuck Lever67c6d102008-12-05 19:02:45 -0500378 return NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500379 goto retry;
Chuck Lever67c6d102008-12-05 19:02:45 -0500380}
381
382/**
Chuck Lever3420a8c2008-12-05 19:03:46 -0500383 * nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
384 * @info: pointer to NLMPROC_SM_NOTIFY arguments
385 *
386 * Returns a matching nsm_handle if found in the nsm cache; the returned
387 * nsm_handle's reference count is bumped and sm_monitored is cleared.
388 * Otherwise returns NULL if some error occurred.
389 */
390struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
391{
392 struct nsm_handle *cached;
393
394 spin_lock(&nsm_lock);
395
Chuck Lever94da7662008-12-11 17:56:07 -0500396 cached = nsm_lookup_priv(&info->priv);
Chuck Lever3420a8c2008-12-05 19:03:46 -0500397 if (unlikely(cached == NULL)) {
398 spin_unlock(&nsm_lock);
399 dprintk("lockd: never saw rebooted peer '%.*s' before\n",
400 info->len, info->mon);
401 return cached;
402 }
403
404 atomic_inc(&cached->sm_count);
405 spin_unlock(&nsm_lock);
406
407 /*
408 * During subsequent lock activity, force a fresh
409 * notification to be set up for this host.
410 */
411 cached->sm_monitored = 0;
412
413 dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
414 cached->sm_name, cached->sm_addrbuf,
415 atomic_read(&cached->sm_count));
416 return cached;
417}
418
419/**
Chuck Lever67c6d102008-12-05 19:02:45 -0500420 * nsm_release - Release an NSM handle
421 * @nsm: pointer to handle to be released
422 *
423 */
424void nsm_release(struct nsm_handle *nsm)
425{
Chuck Lever67c6d102008-12-05 19:02:45 -0500426 if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
427 list_del(&nsm->sm_link);
428 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500429 dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
430 nsm->sm_name, nsm->sm_addrbuf);
Chuck Lever67c6d102008-12-05 19:02:45 -0500431 kfree(nsm);
432 }
433}
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 * XDR functions for NSM.
Chuck Lever2ca77542008-03-14 14:26:01 -0400437 *
438 * See http://www.opengroup.org/ for details on the Network
439 * Status Monitor wire protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 */
441
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500442static int encode_nsm_string(struct xdr_stream *xdr, const char *string)
Chuck Lever099bd052008-03-14 14:25:32 -0400443{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500444 const u32 len = strlen(string);
445 __be32 *p;
Chuck Lever099bd052008-03-14 14:25:32 -0400446
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500447 if (unlikely(len > SM_MAXSTRLEN))
448 return -EIO;
449 p = xdr_reserve_space(xdr, sizeof(u32) + len);
450 if (unlikely(p == NULL))
451 return -EIO;
452 xdr_encode_opaque(p, string, len);
453 return 0;
Chuck Lever099bd052008-03-14 14:25:32 -0400454}
455
Chuck Lever49695172008-03-14 14:25:39 -0400456/*
457 * "mon_name" specifies the host to be monitored.
Chuck Lever49695172008-03-14 14:25:39 -0400458 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500459static int encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever49695172008-03-14 14:25:39 -0400460{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500461 return encode_nsm_string(xdr, argp->mon_name);
Chuck Lever49695172008-03-14 14:25:39 -0400462}
463
Chuck Lever850c95f2008-03-14 14:25:46 -0400464/*
465 * The "my_id" argument specifies the hostname and RPC procedure
466 * to be called when the status manager receives notification
Chuck Lever36e8e662008-12-05 19:02:07 -0500467 * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
Chuck Lever850c95f2008-03-14 14:25:46 -0400468 * has changed.
469 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500470static int encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever850c95f2008-03-14 14:25:46 -0400471{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500472 int status;
473 __be32 *p;
Chuck Lever850c95f2008-03-14 14:25:46 -0400474
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500475 status = encode_nsm_string(xdr, utsname()->nodename);
476 if (unlikely(status != 0))
477 return status;
478 p = xdr_reserve_space(xdr, 3 * sizeof(u32));
479 if (unlikely(p == NULL))
480 return -EIO;
Chuck Lever850c95f2008-03-14 14:25:46 -0400481 *p++ = htonl(argp->prog);
482 *p++ = htonl(argp->vers);
483 *p++ = htonl(argp->proc);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500484 return 0;
Chuck Lever850c95f2008-03-14 14:25:46 -0400485}
486
Chuck Leverea72a7f2008-03-14 14:25:53 -0400487/*
488 * The "mon_id" argument specifies the non-private arguments
Chuck Lever36e8e662008-12-05 19:02:07 -0500489 * of an NSMPROC_MON or NSMPROC_UNMON call.
Chuck Leverea72a7f2008-03-14 14:25:53 -0400490 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500491static int encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Leverea72a7f2008-03-14 14:25:53 -0400492{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500493 int status;
Chuck Leverea72a7f2008-03-14 14:25:53 -0400494
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500495 status = encode_mon_name(xdr, argp);
496 if (unlikely(status != 0))
497 return status;
498 return encode_my_id(xdr, argp);
Chuck Leverea72a7f2008-03-14 14:25:53 -0400499}
500
Chuck Lever0490a542008-03-14 14:26:08 -0400501/*
502 * The "priv" argument may contain private information required
Chuck Lever36e8e662008-12-05 19:02:07 -0500503 * by the NSMPROC_MON call. This information will be supplied in the
504 * NLMPROC_SM_NOTIFY call.
Chuck Lever0490a542008-03-14 14:26:08 -0400505 */
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500506static int encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever0490a542008-03-14 14:26:08 -0400507{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500508 __be32 *p;
509
510 p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
511 if (unlikely(p == NULL))
512 return -EIO;
Chuck Levercab2d3c2008-12-05 19:03:24 -0500513 xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 return 0;
515}
516
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500517static int xdr_enc_mon(struct rpc_rqst *req, __be32 *p,
518 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500520 struct xdr_stream xdr;
521 int status;
522
523 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
524 status = encode_mon_id(&xdr, argp);
525 if (unlikely(status))
526 return status;
527 return encode_priv(&xdr, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528}
529
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500530static int xdr_enc_unmon(struct rpc_rqst *req, __be32 *p,
531 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500533 struct xdr_stream xdr;
534
535 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
536 return encode_mon_id(&xdr, argp);
537}
538
539static int xdr_dec_stat_res(struct rpc_rqst *rqstp, __be32 *p,
540 struct nsm_res *resp)
541{
542 struct xdr_stream xdr;
543
544 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
545 p = xdr_inline_decode(&xdr, 2 * sizeof(u32));
546 if (unlikely(p == NULL))
547 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 resp->status = ntohl(*p++);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500549 resp->state = ntohl(*p);
550
551 dprintk("lockd: xdr_dec_stat_res status %d state %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 resp->status, resp->state);
553 return 0;
554}
555
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500556static int xdr_dec_stat(struct rpc_rqst *rqstp, __be32 *p,
557 struct nsm_res *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500559 struct xdr_stream xdr;
560
561 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
562 p = xdr_inline_decode(&xdr, sizeof(u32));
563 if (unlikely(p == NULL))
564 return -EIO;
565 resp->state = ntohl(*p);
566
567 dprintk("lockd: xdr_dec_stat state %d\n", resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 return 0;
569}
570
571#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
Chuck Lever2ca77542008-03-14 14:26:01 -0400572#define SM_my_id_sz (SM_my_name_sz+3)
573#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
574#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
Chuck Lever0490a542008-03-14 14:26:08 -0400575#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
576#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577#define SM_monres_sz 2
578#define SM_unmonres_sz 1
579
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580static struct rpc_procinfo nsm_procedures[] = {
Chuck Lever36e8e662008-12-05 19:02:07 -0500581[NSMPROC_MON] = {
582 .p_proc = NSMPROC_MON,
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500583 .p_encode = (kxdrproc_t)xdr_enc_mon,
584 .p_decode = (kxdrproc_t)xdr_dec_stat_res,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400585 .p_arglen = SM_mon_sz,
586 .p_replen = SM_monres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500587 .p_statidx = NSMPROC_MON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500588 .p_name = "MONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 },
Chuck Lever36e8e662008-12-05 19:02:07 -0500590[NSMPROC_UNMON] = {
591 .p_proc = NSMPROC_UNMON,
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500592 .p_encode = (kxdrproc_t)xdr_enc_unmon,
593 .p_decode = (kxdrproc_t)xdr_dec_stat,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400594 .p_arglen = SM_mon_id_sz,
595 .p_replen = SM_unmonres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500596 .p_statidx = NSMPROC_UNMON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500597 .p_name = "UNMONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 },
599};
600
601static struct rpc_version nsm_version1 = {
Tobias Klausere8c96f82006-03-24 03:15:34 -0800602 .number = 1,
603 .nrprocs = ARRAY_SIZE(nsm_procedures),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 .procs = nsm_procedures
605};
606
607static struct rpc_version * nsm_version[] = {
608 [1] = &nsm_version1,
609};
610
611static struct rpc_stat nsm_stats;
612
613static struct rpc_program nsm_program = {
614 .name = "statd",
Chuck Lever36e8e662008-12-05 19:02:07 -0500615 .number = NSM_PROGRAM,
Tobias Klausere8c96f82006-03-24 03:15:34 -0800616 .nrvers = ARRAY_SIZE(nsm_version),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 .version = nsm_version,
618 .stats = &nsm_stats
619};