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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/kernel.h>
Chuck Lever94da7662008-12-11 17:56:07 -050011#include <linux/ktime.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Chuck Lever94da7662008-12-11 17:56:07 -050013
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/sunrpc/clnt.h>
Jeff Layton59766872013-02-04 12:50:00 -050015#include <linux/sunrpc/addr.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
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +040022#include "netns.h"
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#define NLMDBG_FACILITY NLMDBG_MONITOR
Chuck Lever36e8e662008-12-05 19:02:07 -050025#define NSM_PROGRAM 100024
26#define NSM_VERSION 1
27
28enum {
29 NSMPROC_NULL,
30 NSMPROC_STAT,
31 NSMPROC_MON,
32 NSMPROC_UNMON,
33 NSMPROC_UNMON_ALL,
34 NSMPROC_SIMU_CRASH,
35 NSMPROC_NOTIFY,
36};
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Chuck Lever9c1bfd02008-12-05 19:01:59 -050038struct nsm_args {
Chuck Levercab2d3c2008-12-05 19:03:24 -050039 struct nsm_private *priv;
Chuck Lever9c1bfd02008-12-05 19:01:59 -050040 u32 prog; /* RPC callback info */
41 u32 vers;
42 u32 proc;
43
44 char *mon_name;
Stanislav Kinsbursky303a7ce2012-09-18 13:37:18 +040045 char *nodename;
Chuck Lever9c1bfd02008-12-05 19:01:59 -050046};
47
48struct nsm_res {
49 u32 status;
50 u32 state;
51};
52
Trond Myklebusta613fa12012-01-20 13:53:56 -050053static const struct rpc_program nsm_program;
Chuck Lever67c6d102008-12-05 19:02:45 -050054static LIST_HEAD(nsm_handles);
55static DEFINE_SPINLOCK(nsm_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57/*
58 * Local NSM state
59 */
Chuck Lever6c9dc422009-06-17 18:02:10 -070060u32 __read_mostly nsm_local_state;
Rusty Russell90ab5ee2012-01-13 09:32:20 +103061bool __read_mostly nsm_use_hostnames;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Chuck Lever8529bc52008-12-11 17:56:22 -050063static inline struct sockaddr *nsm_addr(const struct nsm_handle *nsm)
64{
65 return (struct sockaddr *)&nsm->sm_addr;
66}
67
Stanislav Kinsbursky0e1cb5c2012-01-31 15:08:21 +040068static struct rpc_clnt *nsm_create(struct net *net)
Chuck Lever49b56992008-12-11 17:56:37 -050069{
70 struct sockaddr_in sin = {
71 .sin_family = AF_INET,
72 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
73 };
74 struct rpc_create_args args = {
Stanislav Kinsbursky0e1cb5c2012-01-31 15:08:21 +040075 .net = net,
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +040076 .protocol = XPRT_TRANSPORT_TCP,
Chuck Lever49b56992008-12-11 17:56:37 -050077 .address = (struct sockaddr *)&sin,
78 .addrsize = sizeof(sin),
79 .servername = "rpc.statd",
80 .program = &nsm_program,
81 .version = NSM_VERSION,
82 .authflavor = RPC_AUTH_NULL,
Chuck Lever0e5c2632009-06-17 18:02:11 -070083 .flags = RPC_CLNT_CREATE_NOPING,
Chuck Lever49b56992008-12-11 17:56:37 -050084 };
85
86 return rpc_create(&args);
87}
88
Trond Myklebusta4ee8d92012-10-23 13:51:58 -040089static struct rpc_clnt *nsm_client_set(struct lockd_net *ln,
90 struct rpc_clnt *clnt)
91{
92 spin_lock(&ln->nsm_clnt_lock);
93 if (ln->nsm_users == 0) {
94 if (clnt == NULL)
95 goto out;
96 ln->nsm_clnt = clnt;
97 }
98 clnt = ln->nsm_clnt;
99 ln->nsm_users++;
100out:
101 spin_unlock(&ln->nsm_clnt_lock);
102 return clnt;
103}
104
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400105static struct rpc_clnt *nsm_client_get(struct net *net)
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400106{
Trond Myklebusta4ee8d92012-10-23 13:51:58 -0400107 struct rpc_clnt *clnt, *new;
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400108 struct lockd_net *ln = net_generic(net, lockd_net_id);
109
Trond Myklebusta4ee8d92012-10-23 13:51:58 -0400110 clnt = nsm_client_set(ln, NULL);
111 if (clnt != NULL)
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400112 goto out;
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400113
Trond Myklebusta4ee8d92012-10-23 13:51:58 -0400114 clnt = new = nsm_create(net);
115 if (IS_ERR(clnt))
116 goto out;
117
118 clnt = nsm_client_set(ln, new);
119 if (clnt != new)
120 rpc_shutdown_client(new);
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400121out:
122 return clnt;
123}
124
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400125static void nsm_client_put(struct net *net)
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400126{
127 struct lockd_net *ln = net_generic(net, lockd_net_id);
Trond Myklebuste498daa2012-10-24 08:53:35 -0400128 struct rpc_clnt *clnt = NULL;
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400129
130 spin_lock(&ln->nsm_clnt_lock);
Trond Myklebuste498daa2012-10-24 08:53:35 -0400131 ln->nsm_users--;
132 if (ln->nsm_users == 0) {
133 clnt = ln->nsm_clnt;
134 ln->nsm_clnt = NULL;
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400135 }
136 spin_unlock(&ln->nsm_clnt_lock);
Trond Myklebuste498daa2012-10-24 08:53:35 -0400137 if (clnt != NULL)
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400138 rpc_shutdown_client(clnt);
139}
140
Stanislav Kinsbursky0e1cb5c2012-01-31 15:08:21 +0400141static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400142 struct rpc_clnt *clnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 int status;
Chuck Levera4846752008-12-04 14:20:23 -0500145 struct nsm_args args = {
Chuck Levercab2d3c2008-12-05 19:03:24 -0500146 .priv = &nsm->sm_priv,
Chuck Levera4846752008-12-04 14:20:23 -0500147 .prog = NLM_PROGRAM,
148 .vers = 3,
149 .proc = NLMPROC_NSM_NOTIFY,
Chuck Lever29ed1402008-12-04 14:20:46 -0500150 .mon_name = nsm->sm_mon_name,
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400151 .nodename = clnt->cl_nodename,
Chuck Levera4846752008-12-04 14:20:23 -0500152 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500153 struct rpc_message msg = {
154 .rpc_argp = &args,
155 .rpc_resp = res,
156 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 memset(res, 0, sizeof(*res));
159
Chuck Leverdead28d2006-03-20 13:44:23 -0500160 msg.rpc_proc = &clnt->cl_procinfo[proc];
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400161 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 if (status < 0)
Chuck Lever5acf4312008-12-04 14:20:31 -0500163 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
164 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 else
166 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return status;
168}
169
Chuck Lever1e493232008-12-04 14:21:24 -0500170/**
171 * nsm_monitor - Notify a peer in case we reboot
172 * @host: pointer to nlm_host of peer to notify
173 *
174 * If this peer is not already monitored, this function sends an
175 * upcall to the local rpc.statd to record the name/address of
176 * the peer to notify in case we reboot.
177 *
178 * Returns zero if the peer is monitored by the local rpc.statd;
179 * otherwise a negative errno value is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 */
Chuck Lever1e493232008-12-04 14:21:24 -0500181int nsm_monitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700183 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 struct nsm_res res;
185 int status;
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400186 struct rpc_clnt *clnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Chuck Lever9fee4902008-12-04 14:20:53 -0500188 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700189
190 if (nsm->sm_monitored)
Olaf Kirch977faf32006-10-04 02:15:51 -0700191 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Chuck Lever29ed1402008-12-04 14:20:46 -0500193 /*
194 * Choose whether to record the caller_name or IP address of
195 * this peer in the local rpc.statd's database.
196 */
197 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
198
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400199 clnt = nsm_client_get(host->net);
200 if (IS_ERR(clnt)) {
201 status = PTR_ERR(clnt);
202 dprintk("lockd: failed to create NSM upcall transport, "
203 "status=%d, net=%p\n", status, host->net);
204 return status;
205 }
206
207 status = nsm_mon_unmon(nsm, NSMPROC_MON, &res, clnt);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700208 if (unlikely(res.status != 0))
Chuck Lever5d254b12008-12-04 14:21:15 -0500209 status = -EIO;
Chuck Lever6c9dc422009-06-17 18:02:10 -0700210 if (unlikely(status < 0)) {
Chuck Lever9fee4902008-12-04 14:20:53 -0500211 printk(KERN_NOTICE "lockd: cannot monitor %s\n", nsm->sm_name);
Chuck Lever6c9dc422009-06-17 18:02:10 -0700212 return status;
213 }
214
215 nsm->sm_monitored = 1;
216 if (unlikely(nsm_local_state != res.state)) {
217 nsm_local_state = res.state;
218 dprintk("lockd: NSM state changed to %d\n", nsm_local_state);
219 }
220 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
Chuck Lever356c3eb2008-12-04 14:21:38 -0500223/**
224 * nsm_unmonitor - Unregister peer notification
225 * @host: pointer to nlm_host of peer to stop monitoring
226 *
227 * If this peer is monitored, this function sends an upcall to
228 * tell the local rpc.statd not to send this peer a notification
229 * when we reboot.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 */
Chuck Lever356c3eb2008-12-04 14:21:38 -0500231void nsm_unmonitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700233 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 struct nsm_res res;
Chuck Lever356c3eb2008-12-04 14:21:38 -0500235 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Olaf Kirch9502c522006-10-04 02:15:56 -0700237 if (atomic_read(&nsm->sm_count) == 1
238 && nsm->sm_monitored && !nsm->sm_sticky) {
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400239 struct lockd_net *ln = net_generic(host->net, lockd_net_id);
240
Chuck Lever9fee4902008-12-04 14:20:53 -0500241 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700242
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400243 status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res, ln->nsm_clnt);
Chuck Lever0c7aef42008-12-04 14:21:46 -0500244 if (res.status != 0)
245 status = -EIO;
Olaf Kirch977faf32006-10-04 02:15:51 -0700246 if (status < 0)
Olaf Kirch9502c522006-10-04 02:15:56 -0700247 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
Chuck Lever9fee4902008-12-04 14:20:53 -0500248 nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700249 else
250 nsm->sm_monitored = 0;
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400251
252 nsm_client_put(host->net);
Olaf Kirch977faf32006-10-04 02:15:51 -0700253 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254}
255
Chuck Lever3420a8c2008-12-05 19:03:46 -0500256static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
257 const size_t len)
258{
259 struct nsm_handle *nsm;
260
261 list_for_each_entry(nsm, &nsm_handles, sm_link)
262 if (strlen(nsm->sm_name) == len &&
263 memcmp(nsm->sm_name, hostname, len) == 0)
264 return nsm;
265 return NULL;
266}
267
Chuck Lever77a3ef32008-12-11 17:55:59 -0500268static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
269{
270 struct nsm_handle *nsm;
271
272 list_for_each_entry(nsm, &nsm_handles, sm_link)
Jeff Layton4516fc02009-08-14 12:57:54 -0400273 if (rpc_cmp_addr(nsm_addr(nsm), sap))
Chuck Lever77a3ef32008-12-11 17:55:59 -0500274 return nsm;
275 return NULL;
276}
277
Chuck Lever3420a8c2008-12-05 19:03:46 -0500278static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
279{
280 struct nsm_handle *nsm;
281
282 list_for_each_entry(nsm, &nsm_handles, sm_link)
283 if (memcmp(nsm->sm_priv.data, priv->data,
284 sizeof(priv->data)) == 0)
285 return nsm;
286 return NULL;
287}
288
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500289/*
290 * Construct a unique cookie to match this nsm_handle to this monitored
291 * host. It is passed to the local rpc.statd via NSMPROC_MON, and
292 * returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
293 * requests.
294 *
Chuck Lever94da7662008-12-11 17:56:07 -0500295 * The NSM protocol requires that these cookies be unique while the
296 * system is running. We prefer a stronger requirement of making them
297 * unique across reboots. If user space bugs cause a stale cookie to
298 * be sent to the kernel, it could cause the wrong host to lose its
299 * lock state if cookies were not unique across reboots.
300 *
301 * The cookies are exposed only to local user space via loopback. They
302 * do not appear on the physical network. If we want greater security
303 * for some reason, nsm_init_private() could perform a one-way hash to
304 * obscure the contents of the cookie.
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500305 */
306static void nsm_init_private(struct nsm_handle *nsm)
307{
Chuck Lever94da7662008-12-11 17:56:07 -0500308 u64 *p = (u64 *)&nsm->sm_priv.data;
Mans Rullgardad5b3652009-03-28 19:55:20 +0000309 s64 ns;
Chuck Lever94da7662008-12-11 17:56:07 -0500310
Thomas Gleixner5eaaed42014-07-16 21:04:46 +0000311 ns = ktime_get_ns();
Mans Rullgardad5b3652009-03-28 19:55:20 +0000312 put_unaligned(ns, p);
313 put_unaligned((unsigned long)nsm, p + 1);
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500314}
315
Chuck Leverb39b8972008-12-11 17:55:52 -0500316static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
317 const size_t salen,
318 const char *hostname,
319 const size_t hostname_len)
320{
321 struct nsm_handle *new;
322
323 new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
324 if (unlikely(new == NULL))
325 return NULL;
326
327 atomic_set(&new->sm_count, 1);
328 new->sm_name = (char *)(new + 1);
329 memcpy(nsm_addr(new), sap, salen);
330 new->sm_addrlen = salen;
331 nsm_init_private(new);
Chuck Leverc15128c2009-08-09 15:09:39 -0400332
333 if (rpc_ntop(nsm_addr(new), new->sm_addrbuf,
334 sizeof(new->sm_addrbuf)) == 0)
335 (void)snprintf(new->sm_addrbuf, sizeof(new->sm_addrbuf),
336 "unsupported address family");
Chuck Leverb39b8972008-12-11 17:55:52 -0500337 memcpy(new->sm_name, hostname, hostname_len);
338 new->sm_name[hostname_len] = '\0';
339
340 return new;
341}
342
Chuck Lever67c6d102008-12-05 19:02:45 -0500343/**
Chuck Lever92fd91b2008-12-05 19:04:01 -0500344 * nsm_get_handle - Find or create a cached nsm_handle
Chuck Lever67c6d102008-12-05 19:02:45 -0500345 * @sap: pointer to socket address of handle to find
346 * @salen: length of socket address
347 * @hostname: pointer to C string containing hostname to find
348 * @hostname_len: length of C string
Chuck Lever67c6d102008-12-05 19:02:45 -0500349 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500350 * Behavior is modulated by the global nsm_use_hostnames variable.
Chuck Lever67c6d102008-12-05 19:02:45 -0500351 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500352 * Returns a cached nsm_handle after bumping its ref count, or
353 * returns a fresh nsm_handle if a handle that matches @sap and/or
354 * @hostname cannot be found in the handle cache. Returns NULL if
355 * an error occurs.
Chuck Lever67c6d102008-12-05 19:02:45 -0500356 */
Chuck Lever92fd91b2008-12-05 19:04:01 -0500357struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
358 const size_t salen, const char *hostname,
359 const size_t hostname_len)
Chuck Lever67c6d102008-12-05 19:02:45 -0500360{
Chuck Lever77a3ef32008-12-11 17:55:59 -0500361 struct nsm_handle *cached, *new = NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500362
Chuck Lever67c6d102008-12-05 19:02:45 -0500363 if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
364 if (printk_ratelimit()) {
365 printk(KERN_WARNING "Invalid hostname \"%.*s\" "
366 "in NFS lock request\n",
367 (int)hostname_len, hostname);
368 }
369 return NULL;
370 }
371
372retry:
373 spin_lock(&nsm_lock);
Chuck Lever67c6d102008-12-05 19:02:45 -0500374
Chuck Lever77a3ef32008-12-11 17:55:59 -0500375 if (nsm_use_hostnames && hostname != NULL)
376 cached = nsm_lookup_hostname(hostname, hostname_len);
377 else
378 cached = nsm_lookup_addr(sap);
379
380 if (cached != NULL) {
381 atomic_inc(&cached->sm_count);
382 spin_unlock(&nsm_lock);
383 kfree(new);
384 dprintk("lockd: found nsm_handle for %s (%s), "
385 "cnt %d\n", cached->sm_name,
386 cached->sm_addrbuf,
387 atomic_read(&cached->sm_count));
388 return cached;
Chuck Lever67c6d102008-12-05 19:02:45 -0500389 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500390
391 if (new != NULL) {
392 list_add(&new->sm_link, &nsm_handles);
393 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500394 dprintk("lockd: created nsm_handle for %s (%s)\n",
Chuck Lever77a3ef32008-12-11 17:55:59 -0500395 new->sm_name, new->sm_addrbuf);
396 return new;
Chuck Lever67c6d102008-12-05 19:02:45 -0500397 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500398
Chuck Lever67c6d102008-12-05 19:02:45 -0500399 spin_unlock(&nsm_lock);
400
Chuck Lever77a3ef32008-12-11 17:55:59 -0500401 new = nsm_create_handle(sap, salen, hostname, hostname_len);
402 if (unlikely(new == NULL))
Chuck Lever67c6d102008-12-05 19:02:45 -0500403 return NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500404 goto retry;
Chuck Lever67c6d102008-12-05 19:02:45 -0500405}
406
407/**
Chuck Lever3420a8c2008-12-05 19:03:46 -0500408 * nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
409 * @info: pointer to NLMPROC_SM_NOTIFY arguments
410 *
Jeff Layton7e469af2010-02-05 15:09:22 -0500411 * Returns a matching nsm_handle if found in the nsm cache. The returned
412 * nsm_handle's reference count is bumped. Otherwise returns NULL if some
413 * error occurred.
Chuck Lever3420a8c2008-12-05 19:03:46 -0500414 */
415struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
416{
417 struct nsm_handle *cached;
418
419 spin_lock(&nsm_lock);
420
Chuck Lever94da7662008-12-11 17:56:07 -0500421 cached = nsm_lookup_priv(&info->priv);
Chuck Lever3420a8c2008-12-05 19:03:46 -0500422 if (unlikely(cached == NULL)) {
423 spin_unlock(&nsm_lock);
424 dprintk("lockd: never saw rebooted peer '%.*s' before\n",
425 info->len, info->mon);
426 return cached;
427 }
428
429 atomic_inc(&cached->sm_count);
430 spin_unlock(&nsm_lock);
431
Chuck Lever3420a8c2008-12-05 19:03:46 -0500432 dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
433 cached->sm_name, cached->sm_addrbuf,
434 atomic_read(&cached->sm_count));
435 return cached;
436}
437
438/**
Chuck Lever67c6d102008-12-05 19:02:45 -0500439 * nsm_release - Release an NSM handle
440 * @nsm: pointer to handle to be released
441 *
442 */
443void nsm_release(struct nsm_handle *nsm)
444{
Chuck Lever67c6d102008-12-05 19:02:45 -0500445 if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
446 list_del(&nsm->sm_link);
447 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500448 dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
449 nsm->sm_name, nsm->sm_addrbuf);
Chuck Lever67c6d102008-12-05 19:02:45 -0500450 kfree(nsm);
451 }
452}
453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 * XDR functions for NSM.
Chuck Lever2ca77542008-03-14 14:26:01 -0400456 *
457 * See http://www.opengroup.org/ for details on the Network
458 * Status Monitor wire protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 */
460
Chuck Lever49b17002010-12-14 14:58:30 +0000461static void encode_nsm_string(struct xdr_stream *xdr, const char *string)
Chuck Lever099bd052008-03-14 14:25:32 -0400462{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500463 const u32 len = strlen(string);
464 __be32 *p;
Chuck Lever099bd052008-03-14 14:25:32 -0400465
Chuck Lever49b17002010-12-14 14:58:30 +0000466 p = xdr_reserve_space(xdr, 4 + len);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500467 xdr_encode_opaque(p, string, len);
Chuck Lever099bd052008-03-14 14:25:32 -0400468}
469
Chuck Lever49695172008-03-14 14:25:39 -0400470/*
471 * "mon_name" specifies the host to be monitored.
Chuck Lever49695172008-03-14 14:25:39 -0400472 */
Chuck Lever49b17002010-12-14 14:58:30 +0000473static void encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever49695172008-03-14 14:25:39 -0400474{
Chuck Lever49b17002010-12-14 14:58:30 +0000475 encode_nsm_string(xdr, argp->mon_name);
Chuck Lever49695172008-03-14 14:25:39 -0400476}
477
Chuck Lever850c95f2008-03-14 14:25:46 -0400478/*
479 * The "my_id" argument specifies the hostname and RPC procedure
480 * to be called when the status manager receives notification
Chuck Lever36e8e662008-12-05 19:02:07 -0500481 * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
Chuck Lever850c95f2008-03-14 14:25:46 -0400482 * has changed.
483 */
Chuck Lever49b17002010-12-14 14:58:30 +0000484static void encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever850c95f2008-03-14 14:25:46 -0400485{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500486 __be32 *p;
Chuck Lever850c95f2008-03-14 14:25:46 -0400487
Stanislav Kinsbursky303a7ce2012-09-18 13:37:18 +0400488 encode_nsm_string(xdr, argp->nodename);
Chuck Lever49b17002010-12-14 14:58:30 +0000489 p = xdr_reserve_space(xdr, 4 + 4 + 4);
490 *p++ = cpu_to_be32(argp->prog);
491 *p++ = cpu_to_be32(argp->vers);
492 *p = cpu_to_be32(argp->proc);
Chuck Lever850c95f2008-03-14 14:25:46 -0400493}
494
Chuck Leverea72a7f2008-03-14 14:25:53 -0400495/*
496 * The "mon_id" argument specifies the non-private arguments
Chuck Lever36e8e662008-12-05 19:02:07 -0500497 * of an NSMPROC_MON or NSMPROC_UNMON call.
Chuck Leverea72a7f2008-03-14 14:25:53 -0400498 */
Chuck Lever49b17002010-12-14 14:58:30 +0000499static void encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Leverea72a7f2008-03-14 14:25:53 -0400500{
Chuck Lever49b17002010-12-14 14:58:30 +0000501 encode_mon_name(xdr, argp);
502 encode_my_id(xdr, argp);
Chuck Leverea72a7f2008-03-14 14:25:53 -0400503}
504
Chuck Lever0490a542008-03-14 14:26:08 -0400505/*
506 * The "priv" argument may contain private information required
Chuck Lever36e8e662008-12-05 19:02:07 -0500507 * by the NSMPROC_MON call. This information will be supplied in the
508 * NLMPROC_SM_NOTIFY call.
Chuck Lever0490a542008-03-14 14:26:08 -0400509 */
Chuck Lever49b17002010-12-14 14:58:30 +0000510static void encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever0490a542008-03-14 14:26:08 -0400511{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500512 __be32 *p;
513
514 p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
Chuck Levercab2d3c2008-12-05 19:03:24 -0500515 xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516}
517
Chuck Lever9f06c712010-12-14 14:59:18 +0000518static void nsm_xdr_enc_mon(struct rpc_rqst *req, struct xdr_stream *xdr,
519 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520{
Chuck Lever9f06c712010-12-14 14:59:18 +0000521 encode_mon_id(xdr, argp);
522 encode_priv(xdr, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
Chuck Lever9f06c712010-12-14 14:59:18 +0000525static void nsm_xdr_enc_unmon(struct rpc_rqst *req, struct xdr_stream *xdr,
526 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527{
Chuck Lever9f06c712010-12-14 14:59:18 +0000528 encode_mon_id(xdr, argp);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500529}
530
Chuck Leverbf269552010-12-14 14:59:29 +0000531static int nsm_xdr_dec_stat_res(struct rpc_rqst *rqstp,
532 struct xdr_stream *xdr,
533 struct nsm_res *resp)
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500534{
Chuck Leverbf269552010-12-14 14:59:29 +0000535 __be32 *p;
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500536
Chuck Leverbf269552010-12-14 14:59:29 +0000537 p = xdr_inline_decode(xdr, 4 + 4);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500538 if (unlikely(p == NULL))
539 return -EIO;
Chuck Lever49b17002010-12-14 14:58:30 +0000540 resp->status = be32_to_cpup(p++);
541 resp->state = be32_to_cpup(p);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500542
Chuck Leverbf269552010-12-14 14:59:29 +0000543 dprintk("lockd: %s status %d state %d\n",
544 __func__, resp->status, resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 return 0;
546}
547
Chuck Leverbf269552010-12-14 14:59:29 +0000548static int nsm_xdr_dec_stat(struct rpc_rqst *rqstp,
549 struct xdr_stream *xdr,
550 struct nsm_res *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551{
Chuck Leverbf269552010-12-14 14:59:29 +0000552 __be32 *p;
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500553
Chuck Leverbf269552010-12-14 14:59:29 +0000554 p = xdr_inline_decode(xdr, 4);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500555 if (unlikely(p == NULL))
556 return -EIO;
Chuck Lever49b17002010-12-14 14:58:30 +0000557 resp->state = be32_to_cpup(p);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500558
Chuck Leverbf269552010-12-14 14:59:29 +0000559 dprintk("lockd: %s state %d\n", __func__, resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return 0;
561}
562
563#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
Chuck Lever2ca77542008-03-14 14:26:01 -0400564#define SM_my_id_sz (SM_my_name_sz+3)
565#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
566#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
Chuck Lever0490a542008-03-14 14:26:08 -0400567#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
568#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569#define SM_monres_sz 2
570#define SM_unmonres_sz 1
571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572static struct rpc_procinfo nsm_procedures[] = {
Chuck Lever36e8e662008-12-05 19:02:07 -0500573[NSMPROC_MON] = {
574 .p_proc = NSMPROC_MON,
Chuck Lever9f06c712010-12-14 14:59:18 +0000575 .p_encode = (kxdreproc_t)nsm_xdr_enc_mon,
Chuck Leverbf269552010-12-14 14:59:29 +0000576 .p_decode = (kxdrdproc_t)nsm_xdr_dec_stat_res,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400577 .p_arglen = SM_mon_sz,
578 .p_replen = SM_monres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500579 .p_statidx = NSMPROC_MON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500580 .p_name = "MONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 },
Chuck Lever36e8e662008-12-05 19:02:07 -0500582[NSMPROC_UNMON] = {
583 .p_proc = NSMPROC_UNMON,
Chuck Lever9f06c712010-12-14 14:59:18 +0000584 .p_encode = (kxdreproc_t)nsm_xdr_enc_unmon,
Chuck Leverbf269552010-12-14 14:59:29 +0000585 .p_decode = (kxdrdproc_t)nsm_xdr_dec_stat,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400586 .p_arglen = SM_mon_id_sz,
587 .p_replen = SM_unmonres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500588 .p_statidx = NSMPROC_UNMON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500589 .p_name = "UNMONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 },
591};
592
Trond Myklebusta613fa12012-01-20 13:53:56 -0500593static const struct rpc_version nsm_version1 = {
Tobias Klausere8c96f82006-03-24 03:15:34 -0800594 .number = 1,
595 .nrprocs = ARRAY_SIZE(nsm_procedures),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 .procs = nsm_procedures
597};
598
Trond Myklebusta613fa12012-01-20 13:53:56 -0500599static const struct rpc_version *nsm_version[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 [1] = &nsm_version1,
601};
602
603static struct rpc_stat nsm_stats;
604
Trond Myklebusta613fa12012-01-20 13:53:56 -0500605static const struct rpc_program nsm_program = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 .name = "statd",
Chuck Lever36e8e662008-12-05 19:02:07 -0500607 .number = NSM_PROGRAM,
Tobias Klausere8c96f82006-03-24 03:15:34 -0800608 .nrvers = ARRAY_SIZE(nsm_version),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 .version = nsm_version,
610 .stats = &nsm_stats
611};