blob: 47a32b6d9b9001a2a58a54fd154e50f7c08891be [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>
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 Lever6c9dc4252009-06-17 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
Trond Myklebust03a9a422015-01-30 18:12:28 -050068static struct rpc_clnt *nsm_create(struct net *net, const char *nodename)
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",
Trond Myklebust03a9a422015-01-30 18:12:28 -050080 .nodename = nodename,
Chuck Lever49b56992008-12-11 17:56:37 -050081 .program = &nsm_program,
82 .version = NSM_VERSION,
83 .authflavor = RPC_AUTH_NULL,
Chuck Lever0e5c2632009-06-17 18:02:11 -070084 .flags = RPC_CLNT_CREATE_NOPING,
Chuck Lever49b56992008-12-11 17:56:37 -050085 };
86
87 return rpc_create(&args);
88}
89
Trond Myklebusta4ee8d92012-10-23 13:51:58 -040090static struct rpc_clnt *nsm_client_set(struct lockd_net *ln,
91 struct rpc_clnt *clnt)
92{
93 spin_lock(&ln->nsm_clnt_lock);
94 if (ln->nsm_users == 0) {
95 if (clnt == NULL)
96 goto out;
97 ln->nsm_clnt = clnt;
98 }
99 clnt = ln->nsm_clnt;
100 ln->nsm_users++;
101out:
102 spin_unlock(&ln->nsm_clnt_lock);
103 return clnt;
104}
105
Trond Myklebust03a9a422015-01-30 18:12:28 -0500106static struct rpc_clnt *nsm_client_get(struct net *net, const char *nodename)
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400107{
Trond Myklebusta4ee8d92012-10-23 13:51:58 -0400108 struct rpc_clnt *clnt, *new;
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400109 struct lockd_net *ln = net_generic(net, lockd_net_id);
110
Trond Myklebusta4ee8d92012-10-23 13:51:58 -0400111 clnt = nsm_client_set(ln, NULL);
112 if (clnt != NULL)
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400113 goto out;
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400114
Trond Myklebust03a9a422015-01-30 18:12:28 -0500115 clnt = new = nsm_create(net, nodename);
Trond Myklebusta4ee8d92012-10-23 13:51:58 -0400116 if (IS_ERR(clnt))
117 goto out;
118
119 clnt = nsm_client_set(ln, new);
120 if (clnt != new)
121 rpc_shutdown_client(new);
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400122out:
123 return clnt;
124}
125
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400126static void nsm_client_put(struct net *net)
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400127{
128 struct lockd_net *ln = net_generic(net, lockd_net_id);
Trond Myklebuste498daa2012-10-24 08:53:35 -0400129 struct rpc_clnt *clnt = NULL;
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400130
131 spin_lock(&ln->nsm_clnt_lock);
Trond Myklebuste498daa2012-10-24 08:53:35 -0400132 ln->nsm_users--;
133 if (ln->nsm_users == 0) {
134 clnt = ln->nsm_clnt;
135 ln->nsm_clnt = NULL;
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400136 }
137 spin_unlock(&ln->nsm_clnt_lock);
Trond Myklebuste498daa2012-10-24 08:53:35 -0400138 if (clnt != NULL)
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400139 rpc_shutdown_client(clnt);
140}
141
Stanislav Kinsbursky0e1cb5c2012-01-31 15:08:21 +0400142static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400143 struct rpc_clnt *clnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 int status;
Chuck Levera4846752008-12-04 14:20:23 -0500146 struct nsm_args args = {
Chuck Levercab2d3c2008-12-05 19:03:24 -0500147 .priv = &nsm->sm_priv,
Chuck Levera4846752008-12-04 14:20:23 -0500148 .prog = NLM_PROGRAM,
149 .vers = 3,
150 .proc = NLMPROC_NSM_NOTIFY,
Chuck Lever29ed1402008-12-04 14:20:46 -0500151 .mon_name = nsm->sm_mon_name,
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400152 .nodename = clnt->cl_nodename,
Chuck Levera4846752008-12-04 14:20:23 -0500153 };
Chuck Leverdead28d2006-03-20 13:44:23 -0500154 struct rpc_message msg = {
155 .rpc_argp = &args,
156 .rpc_resp = res,
157 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 memset(res, 0, sizeof(*res));
160
Chuck Leverdead28d2006-03-20 13:44:23 -0500161 msg.rpc_proc = &clnt->cl_procinfo[proc];
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400162 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
Benjamin Coddington173b3af2014-09-23 12:26:20 -0400163 if (status == -ECONNREFUSED) {
164 dprintk("lockd: NSM upcall RPC failed, status=%d, forcing rebind\n",
165 status);
166 rpc_force_rebind(clnt);
167 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
168 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (status < 0)
Chuck Lever5acf4312008-12-04 14:20:31 -0500170 dprintk("lockd: NSM upcall RPC failed, status=%d\n",
171 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 else
173 status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 return status;
175}
176
Chuck Lever1e49323c2008-12-04 14:21:24 -0500177/**
178 * nsm_monitor - Notify a peer in case we reboot
179 * @host: pointer to nlm_host of peer to notify
180 *
181 * If this peer is not already monitored, this function sends an
182 * upcall to the local rpc.statd to record the name/address of
183 * the peer to notify in case we reboot.
184 *
185 * Returns zero if the peer is monitored by the local rpc.statd;
186 * otherwise a negative errno value is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 */
Chuck Lever1e49323c2008-12-04 14:21:24 -0500188int nsm_monitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700190 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 struct nsm_res res;
192 int status;
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400193 struct rpc_clnt *clnt;
Trond Myklebust03a9a422015-01-30 18:12:28 -0500194 const char *nodename = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Chuck Lever9fee4902008-12-04 14:20:53 -0500196 dprintk("lockd: nsm_monitor(%s)\n", nsm->sm_name);
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700197
198 if (nsm->sm_monitored)
Olaf Kirch977faf32006-10-04 02:15:51 -0700199 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Trond Myklebust03a9a422015-01-30 18:12:28 -0500201 if (host->h_rpcclnt)
202 nodename = host->h_rpcclnt->cl_nodename;
203
Chuck Lever29ed1402008-12-04 14:20:46 -0500204 /*
205 * Choose whether to record the caller_name or IP address of
206 * this peer in the local rpc.statd's database.
207 */
208 nsm->sm_mon_name = nsm_use_hostnames ? nsm->sm_name : nsm->sm_addrbuf;
209
Trond Myklebust03a9a422015-01-30 18:12:28 -0500210 clnt = nsm_client_get(host->net, nodename);
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400211 if (IS_ERR(clnt)) {
212 status = PTR_ERR(clnt);
213 dprintk("lockd: failed to create NSM upcall transport, "
214 "status=%d, net=%p\n", status, host->net);
215 return status;
216 }
217
218 status = nsm_mon_unmon(nsm, NSMPROC_MON, &res, clnt);
Chuck Lever6c9dc4252009-06-17 18:02:10 -0700219 if (unlikely(res.status != 0))
Chuck Lever5d254b12008-12-04 14:21:15 -0500220 status = -EIO;
Chuck Lever6c9dc4252009-06-17 18:02:10 -0700221 if (unlikely(status < 0)) {
Jeff Layton9af94fc2014-10-31 08:28:29 -0400222 pr_notice_ratelimited("lockd: cannot monitor %s\n", nsm->sm_name);
Chuck Lever6c9dc4252009-06-17 18:02:10 -0700223 return status;
224 }
225
226 nsm->sm_monitored = 1;
227 if (unlikely(nsm_local_state != res.state)) {
228 nsm_local_state = res.state;
229 dprintk("lockd: NSM state changed to %d\n", nsm_local_state);
230 }
231 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232}
233
Chuck Lever356c3eb2008-12-04 14:21:38 -0500234/**
235 * nsm_unmonitor - Unregister peer notification
236 * @host: pointer to nlm_host of peer to stop monitoring
237 *
238 * If this peer is monitored, this function sends an upcall to
239 * tell the local rpc.statd not to send this peer a notification
240 * when we reboot.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 */
Chuck Lever356c3eb2008-12-04 14:21:38 -0500242void nsm_unmonitor(const struct nlm_host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
Olaf Kirch8dead0d2006-10-04 02:15:53 -0700244 struct nsm_handle *nsm = host->h_nsmhandle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 struct nsm_res res;
Chuck Lever356c3eb2008-12-04 14:21:38 -0500246 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Olaf Kirch9502c522006-10-04 02:15:56 -0700248 if (atomic_read(&nsm->sm_count) == 1
249 && nsm->sm_monitored && !nsm->sm_sticky) {
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400250 struct lockd_net *ln = net_generic(host->net, lockd_net_id);
251
Chuck Lever9fee4902008-12-04 14:20:53 -0500252 dprintk("lockd: nsm_unmonitor(%s)\n", nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700253
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400254 status = nsm_mon_unmon(nsm, NSMPROC_UNMON, &res, ln->nsm_clnt);
Chuck Lever0c7aef42008-12-04 14:21:46 -0500255 if (res.status != 0)
256 status = -EIO;
Olaf Kirch977faf32006-10-04 02:15:51 -0700257 if (status < 0)
Olaf Kirch9502c522006-10-04 02:15:56 -0700258 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
Chuck Lever9fee4902008-12-04 14:20:53 -0500259 nsm->sm_name);
Olaf Kirch9502c522006-10-04 02:15:56 -0700260 else
261 nsm->sm_monitored = 0;
Stanislav Kinsburskycb7323f2012-09-18 13:37:23 +0400262
263 nsm_client_put(host->net);
Olaf Kirch977faf32006-10-04 02:15:51 -0700264 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266
Chuck Lever3420a8c2008-12-05 19:03:46 -0500267static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
268 const size_t len)
269{
270 struct nsm_handle *nsm;
271
272 list_for_each_entry(nsm, &nsm_handles, sm_link)
273 if (strlen(nsm->sm_name) == len &&
274 memcmp(nsm->sm_name, hostname, len) == 0)
275 return nsm;
276 return NULL;
277}
278
Chuck Lever77a3ef32008-12-11 17:55:59 -0500279static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)
280{
281 struct nsm_handle *nsm;
282
283 list_for_each_entry(nsm, &nsm_handles, sm_link)
Jeff Layton4516fc02009-08-14 12:57:54 -0400284 if (rpc_cmp_addr(nsm_addr(nsm), sap))
Chuck Lever77a3ef32008-12-11 17:55:59 -0500285 return nsm;
286 return NULL;
287}
288
Chuck Lever3420a8c2008-12-05 19:03:46 -0500289static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
290{
291 struct nsm_handle *nsm;
292
293 list_for_each_entry(nsm, &nsm_handles, sm_link)
294 if (memcmp(nsm->sm_priv.data, priv->data,
295 sizeof(priv->data)) == 0)
296 return nsm;
297 return NULL;
298}
299
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500300/*
301 * Construct a unique cookie to match this nsm_handle to this monitored
302 * host. It is passed to the local rpc.statd via NSMPROC_MON, and
303 * returned via NLMPROC_SM_NOTIFY, in the "priv" field of these
304 * requests.
305 *
Chuck Lever94da7662008-12-11 17:56:07 -0500306 * The NSM protocol requires that these cookies be unique while the
307 * system is running. We prefer a stronger requirement of making them
308 * unique across reboots. If user space bugs cause a stale cookie to
309 * be sent to the kernel, it could cause the wrong host to lose its
310 * lock state if cookies were not unique across reboots.
311 *
312 * The cookies are exposed only to local user space via loopback. They
313 * do not appear on the physical network. If we want greater security
314 * for some reason, nsm_init_private() could perform a one-way hash to
315 * obscure the contents of the cookie.
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500316 */
317static void nsm_init_private(struct nsm_handle *nsm)
318{
Chuck Lever94da7662008-12-11 17:56:07 -0500319 u64 *p = (u64 *)&nsm->sm_priv.data;
Mans Rullgardad5b3652009-03-28 19:55:20 +0000320 s64 ns;
Chuck Lever94da7662008-12-11 17:56:07 -0500321
Thomas Gleixner5eaaed42014-07-16 21:04:46 +0000322 ns = ktime_get_ns();
Mans Rullgardad5b3652009-03-28 19:55:20 +0000323 put_unaligned(ns, p);
324 put_unaligned((unsigned long)nsm, p + 1);
Chuck Lever7e44d3b2008-12-05 19:03:16 -0500325}
326
Chuck Leverb39b8972008-12-11 17:55:52 -0500327static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,
328 const size_t salen,
329 const char *hostname,
330 const size_t hostname_len)
331{
332 struct nsm_handle *new;
333
334 new = kzalloc(sizeof(*new) + hostname_len + 1, GFP_KERNEL);
335 if (unlikely(new == NULL))
336 return NULL;
337
338 atomic_set(&new->sm_count, 1);
339 new->sm_name = (char *)(new + 1);
340 memcpy(nsm_addr(new), sap, salen);
341 new->sm_addrlen = salen;
342 nsm_init_private(new);
Chuck Leverc15128c2009-08-09 15:09:39 -0400343
344 if (rpc_ntop(nsm_addr(new), new->sm_addrbuf,
345 sizeof(new->sm_addrbuf)) == 0)
346 (void)snprintf(new->sm_addrbuf, sizeof(new->sm_addrbuf),
347 "unsupported address family");
Chuck Leverb39b8972008-12-11 17:55:52 -0500348 memcpy(new->sm_name, hostname, hostname_len);
349 new->sm_name[hostname_len] = '\0';
350
351 return new;
352}
353
Chuck Lever67c6d102008-12-05 19:02:45 -0500354/**
Chuck Lever92fd91b2008-12-05 19:04:01 -0500355 * nsm_get_handle - Find or create a cached nsm_handle
Chuck Lever67c6d102008-12-05 19:02:45 -0500356 * @sap: pointer to socket address of handle to find
357 * @salen: length of socket address
358 * @hostname: pointer to C string containing hostname to find
359 * @hostname_len: length of C string
Chuck Lever67c6d102008-12-05 19:02:45 -0500360 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500361 * Behavior is modulated by the global nsm_use_hostnames variable.
Chuck Lever67c6d102008-12-05 19:02:45 -0500362 *
Chuck Lever92fd91b2008-12-05 19:04:01 -0500363 * Returns a cached nsm_handle after bumping its ref count, or
364 * returns a fresh nsm_handle if a handle that matches @sap and/or
365 * @hostname cannot be found in the handle cache. Returns NULL if
366 * an error occurs.
Chuck Lever67c6d102008-12-05 19:02:45 -0500367 */
Chuck Lever92fd91b2008-12-05 19:04:01 -0500368struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
369 const size_t salen, const char *hostname,
370 const size_t hostname_len)
Chuck Lever67c6d102008-12-05 19:02:45 -0500371{
Chuck Lever77a3ef32008-12-11 17:55:59 -0500372 struct nsm_handle *cached, *new = NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500373
Chuck Lever67c6d102008-12-05 19:02:45 -0500374 if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
375 if (printk_ratelimit()) {
376 printk(KERN_WARNING "Invalid hostname \"%.*s\" "
377 "in NFS lock request\n",
378 (int)hostname_len, hostname);
379 }
380 return NULL;
381 }
382
383retry:
384 spin_lock(&nsm_lock);
Chuck Lever67c6d102008-12-05 19:02:45 -0500385
Chuck Lever77a3ef32008-12-11 17:55:59 -0500386 if (nsm_use_hostnames && hostname != NULL)
387 cached = nsm_lookup_hostname(hostname, hostname_len);
388 else
389 cached = nsm_lookup_addr(sap);
390
391 if (cached != NULL) {
392 atomic_inc(&cached->sm_count);
393 spin_unlock(&nsm_lock);
394 kfree(new);
395 dprintk("lockd: found nsm_handle for %s (%s), "
396 "cnt %d\n", cached->sm_name,
397 cached->sm_addrbuf,
398 atomic_read(&cached->sm_count));
399 return cached;
Chuck Lever67c6d102008-12-05 19:02:45 -0500400 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500401
402 if (new != NULL) {
403 list_add(&new->sm_link, &nsm_handles);
404 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500405 dprintk("lockd: created nsm_handle for %s (%s)\n",
Chuck Lever77a3ef32008-12-11 17:55:59 -0500406 new->sm_name, new->sm_addrbuf);
407 return new;
Chuck Lever67c6d102008-12-05 19:02:45 -0500408 }
Chuck Lever77a3ef32008-12-11 17:55:59 -0500409
Chuck Lever67c6d102008-12-05 19:02:45 -0500410 spin_unlock(&nsm_lock);
411
Chuck Lever77a3ef32008-12-11 17:55:59 -0500412 new = nsm_create_handle(sap, salen, hostname, hostname_len);
413 if (unlikely(new == NULL))
Chuck Lever67c6d102008-12-05 19:02:45 -0500414 return NULL;
Chuck Lever67c6d102008-12-05 19:02:45 -0500415 goto retry;
Chuck Lever67c6d102008-12-05 19:02:45 -0500416}
417
418/**
Chuck Lever3420a8c2008-12-05 19:03:46 -0500419 * nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
420 * @info: pointer to NLMPROC_SM_NOTIFY arguments
421 *
Jeff Layton7e469af2010-02-05 15:09:22 -0500422 * Returns a matching nsm_handle if found in the nsm cache. The returned
423 * nsm_handle's reference count is bumped. Otherwise returns NULL if some
424 * error occurred.
Chuck Lever3420a8c2008-12-05 19:03:46 -0500425 */
426struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
427{
428 struct nsm_handle *cached;
429
430 spin_lock(&nsm_lock);
431
Chuck Lever94da7662008-12-11 17:56:07 -0500432 cached = nsm_lookup_priv(&info->priv);
Chuck Lever3420a8c2008-12-05 19:03:46 -0500433 if (unlikely(cached == NULL)) {
434 spin_unlock(&nsm_lock);
435 dprintk("lockd: never saw rebooted peer '%.*s' before\n",
436 info->len, info->mon);
437 return cached;
438 }
439
440 atomic_inc(&cached->sm_count);
441 spin_unlock(&nsm_lock);
442
Chuck Lever3420a8c2008-12-05 19:03:46 -0500443 dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
444 cached->sm_name, cached->sm_addrbuf,
445 atomic_read(&cached->sm_count));
446 return cached;
447}
448
449/**
Chuck Lever67c6d102008-12-05 19:02:45 -0500450 * nsm_release - Release an NSM handle
451 * @nsm: pointer to handle to be released
452 *
453 */
454void nsm_release(struct nsm_handle *nsm)
455{
Chuck Lever67c6d102008-12-05 19:02:45 -0500456 if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
457 list_del(&nsm->sm_link);
458 spin_unlock(&nsm_lock);
Chuck Lever5cf1c4b2008-12-05 19:02:53 -0500459 dprintk("lockd: destroyed nsm_handle for %s (%s)\n",
460 nsm->sm_name, nsm->sm_addrbuf);
Chuck Lever67c6d102008-12-05 19:02:45 -0500461 kfree(nsm);
462 }
463}
464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 * XDR functions for NSM.
Chuck Lever2ca77542008-03-14 14:26:01 -0400467 *
468 * See http://www.opengroup.org/ for details on the Network
469 * Status Monitor wire protocol.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 */
471
Chuck Lever49b17002010-12-14 14:58:30 +0000472static void encode_nsm_string(struct xdr_stream *xdr, const char *string)
Chuck Lever099bd052008-03-14 14:25:32 -0400473{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500474 const u32 len = strlen(string);
475 __be32 *p;
Chuck Lever099bd052008-03-14 14:25:32 -0400476
Chuck Lever49b17002010-12-14 14:58:30 +0000477 p = xdr_reserve_space(xdr, 4 + len);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500478 xdr_encode_opaque(p, string, len);
Chuck Lever099bd052008-03-14 14:25:32 -0400479}
480
Chuck Lever49695172008-03-14 14:25:39 -0400481/*
482 * "mon_name" specifies the host to be monitored.
Chuck Lever49695172008-03-14 14:25:39 -0400483 */
Chuck Lever49b17002010-12-14 14:58:30 +0000484static void encode_mon_name(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever49695172008-03-14 14:25:39 -0400485{
Chuck Lever49b17002010-12-14 14:58:30 +0000486 encode_nsm_string(xdr, argp->mon_name);
Chuck Lever49695172008-03-14 14:25:39 -0400487}
488
Chuck Lever850c95f2008-03-14 14:25:46 -0400489/*
490 * The "my_id" argument specifies the hostname and RPC procedure
491 * to be called when the status manager receives notification
Chuck Lever36e8e662008-12-05 19:02:07 -0500492 * (via the NLMPROC_SM_NOTIFY call) that the state of host "mon_name"
Chuck Lever850c95f2008-03-14 14:25:46 -0400493 * has changed.
494 */
Chuck Lever49b17002010-12-14 14:58:30 +0000495static void encode_my_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever850c95f2008-03-14 14:25:46 -0400496{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500497 __be32 *p;
Chuck Lever850c95f2008-03-14 14:25:46 -0400498
Stanislav Kinsbursky303a7ce2012-09-18 13:37:18 +0400499 encode_nsm_string(xdr, argp->nodename);
Chuck Lever49b17002010-12-14 14:58:30 +0000500 p = xdr_reserve_space(xdr, 4 + 4 + 4);
501 *p++ = cpu_to_be32(argp->prog);
502 *p++ = cpu_to_be32(argp->vers);
503 *p = cpu_to_be32(argp->proc);
Chuck Lever850c95f2008-03-14 14:25:46 -0400504}
505
Chuck Leverea72a7f2008-03-14 14:25:53 -0400506/*
507 * The "mon_id" argument specifies the non-private arguments
Chuck Lever36e8e662008-12-05 19:02:07 -0500508 * of an NSMPROC_MON or NSMPROC_UNMON call.
Chuck Leverea72a7f2008-03-14 14:25:53 -0400509 */
Chuck Lever49b17002010-12-14 14:58:30 +0000510static void encode_mon_id(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Leverea72a7f2008-03-14 14:25:53 -0400511{
Chuck Lever49b17002010-12-14 14:58:30 +0000512 encode_mon_name(xdr, argp);
513 encode_my_id(xdr, argp);
Chuck Leverea72a7f2008-03-14 14:25:53 -0400514}
515
Chuck Lever0490a542008-03-14 14:26:08 -0400516/*
517 * The "priv" argument may contain private information required
Chuck Lever36e8e662008-12-05 19:02:07 -0500518 * by the NSMPROC_MON call. This information will be supplied in the
519 * NLMPROC_SM_NOTIFY call.
Chuck Lever0490a542008-03-14 14:26:08 -0400520 */
Chuck Lever49b17002010-12-14 14:58:30 +0000521static void encode_priv(struct xdr_stream *xdr, const struct nsm_args *argp)
Chuck Lever0490a542008-03-14 14:26:08 -0400522{
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500523 __be32 *p;
524
525 p = xdr_reserve_space(xdr, SM_PRIV_SIZE);
Chuck Levercab2d3c2008-12-05 19:03:24 -0500526 xdr_encode_opaque_fixed(p, argp->priv->data, SM_PRIV_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527}
528
Chuck Lever9f06c712010-12-14 14:59:18 +0000529static void nsm_xdr_enc_mon(struct rpc_rqst *req, struct xdr_stream *xdr,
530 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531{
Chuck Lever9f06c712010-12-14 14:59:18 +0000532 encode_mon_id(xdr, argp);
533 encode_priv(xdr, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534}
535
Chuck Lever9f06c712010-12-14 14:59:18 +0000536static void nsm_xdr_enc_unmon(struct rpc_rqst *req, struct xdr_stream *xdr,
537 const struct nsm_args *argp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
Chuck Lever9f06c712010-12-14 14:59:18 +0000539 encode_mon_id(xdr, argp);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500540}
541
Chuck Leverbf269552010-12-14 14:59:29 +0000542static int nsm_xdr_dec_stat_res(struct rpc_rqst *rqstp,
543 struct xdr_stream *xdr,
544 struct nsm_res *resp)
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500545{
Chuck Leverbf269552010-12-14 14:59:29 +0000546 __be32 *p;
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500547
Chuck Leverbf269552010-12-14 14:59:29 +0000548 p = xdr_inline_decode(xdr, 4 + 4);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500549 if (unlikely(p == NULL))
550 return -EIO;
Chuck Lever49b17002010-12-14 14:58:30 +0000551 resp->status = be32_to_cpup(p++);
552 resp->state = be32_to_cpup(p);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500553
Chuck Leverbf269552010-12-14 14:59:29 +0000554 dprintk("lockd: %s status %d state %d\n",
555 __func__, resp->status, resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 return 0;
557}
558
Chuck Leverbf269552010-12-14 14:59:29 +0000559static int nsm_xdr_dec_stat(struct rpc_rqst *rqstp,
560 struct xdr_stream *xdr,
561 struct nsm_res *resp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562{
Chuck Leverbf269552010-12-14 14:59:29 +0000563 __be32 *p;
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500564
Chuck Leverbf269552010-12-14 14:59:29 +0000565 p = xdr_inline_decode(xdr, 4);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500566 if (unlikely(p == NULL))
567 return -EIO;
Chuck Lever49b17002010-12-14 14:58:30 +0000568 resp->state = be32_to_cpup(p);
Chuck Lever03eb1dc2008-12-05 19:02:15 -0500569
Chuck Leverbf269552010-12-14 14:59:29 +0000570 dprintk("lockd: %s state %d\n", __func__, resp->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return 0;
572}
573
574#define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
Chuck Lever2ca77542008-03-14 14:26:01 -0400575#define SM_my_id_sz (SM_my_name_sz+3)
576#define SM_mon_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
577#define SM_mon_id_sz (SM_mon_name_sz+SM_my_id_sz)
Chuck Lever0490a542008-03-14 14:26:08 -0400578#define SM_priv_sz (XDR_QUADLEN(SM_PRIV_SIZE))
579#define SM_mon_sz (SM_mon_id_sz+SM_priv_sz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580#define SM_monres_sz 2
581#define SM_unmonres_sz 1
582
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583static struct rpc_procinfo nsm_procedures[] = {
Chuck Lever36e8e662008-12-05 19:02:07 -0500584[NSMPROC_MON] = {
585 .p_proc = NSMPROC_MON,
Chuck Lever9f06c712010-12-14 14:59:18 +0000586 .p_encode = (kxdreproc_t)nsm_xdr_enc_mon,
Chuck Leverbf269552010-12-14 14:59:29 +0000587 .p_decode = (kxdrdproc_t)nsm_xdr_dec_stat_res,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400588 .p_arglen = SM_mon_sz,
589 .p_replen = SM_monres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500590 .p_statidx = NSMPROC_MON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500591 .p_name = "MONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 },
Chuck Lever36e8e662008-12-05 19:02:07 -0500593[NSMPROC_UNMON] = {
594 .p_proc = NSMPROC_UNMON,
Chuck Lever9f06c712010-12-14 14:59:18 +0000595 .p_encode = (kxdreproc_t)nsm_xdr_enc_unmon,
Chuck Leverbf269552010-12-14 14:59:29 +0000596 .p_decode = (kxdrdproc_t)nsm_xdr_dec_stat,
Chuck Lever2bea90d2007-03-29 16:47:53 -0400597 .p_arglen = SM_mon_id_sz,
598 .p_replen = SM_unmonres_sz,
Chuck Lever36e8e662008-12-05 19:02:07 -0500599 .p_statidx = NSMPROC_UNMON,
Chuck Levercc0175c2006-03-20 13:44:22 -0500600 .p_name = "UNMONITOR",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 },
602};
603
Trond Myklebusta613fa12012-01-20 13:53:56 -0500604static const struct rpc_version nsm_version1 = {
Tobias Klausere8c96f82006-03-24 03:15:34 -0800605 .number = 1,
606 .nrprocs = ARRAY_SIZE(nsm_procedures),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 .procs = nsm_procedures
608};
609
Trond Myklebusta613fa12012-01-20 13:53:56 -0500610static const struct rpc_version *nsm_version[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 [1] = &nsm_version1,
612};
613
614static struct rpc_stat nsm_stats;
615
Trond Myklebusta613fa12012-01-20 13:53:56 -0500616static const struct rpc_program nsm_program = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 .name = "statd",
Chuck Lever36e8e662008-12-05 19:02:07 -0500618 .number = NSM_PROGRAM,
Tobias Klausere8c96f82006-03-24 03:15:34 -0800619 .nrvers = ARRAY_SIZE(nsm_version),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 .version = nsm_version,
621 .stats = &nsm_stats
622};