1 /*-
2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
3 * Authors: Doug Rabson <dfr@rabson.org>
4 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include "opt_inet6.h"
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/10.1/sys/nlm/nlm_prot_impl.c 263781 2014-03-26 23:57:09Z delphij $");
32
33 #include <sys/param.h>
34 #include <sys/fail.h>
35 #include <sys/fcntl.h>
36 #include <sys/kernel.h>
37 #include <sys/kthread.h>
38 #include <sys/lockf.h>
39 #include <sys/malloc.h>
40 #include <sys/mount.h>
41 #if __FreeBSD_version >= 700000
42 #include <sys/priv.h>
43 #endif
44 #include <sys/proc.h>
45 #include <sys/socket.h>
46 #include <sys/socketvar.h>
47 #include <sys/syscall.h>
48 #include <sys/sysctl.h>
49 #include <sys/sysent.h>
50 #include <sys/syslog.h>
51 #include <sys/sysproto.h>
52 #include <sys/systm.h>
53 #include <sys/taskqueue.h>
54 #include <sys/unistd.h>
55 #include <sys/vnode.h>
56
57 #include <nfs/nfsproto.h>
58 #include <nfs/nfs_lock.h>
59
60 #include <nlm/nlm_prot.h>
61 #include <nlm/sm_inter.h>
62 #include <nlm/nlm.h>
63 #include <rpc/rpc_com.h>
64 #include <rpc/rpcb_prot.h>
65
66 MALLOC_DEFINE(M_NLM, "NLM", "Network Lock Manager");
67
68 /*
69 * If a host is inactive (and holds no locks) for this amount of
70 * seconds, we consider it idle and stop tracking it.
71 */
72 #define NLM_IDLE_TIMEOUT 30
73
74 /*
75 * We check the host list for idle every few seconds.
76 */
77 #define NLM_IDLE_PERIOD 5
78
79 /*
80 * We only look for GRANTED_RES messages for a little while.
81 */
82 #define NLM_EXPIRE_TIMEOUT 10
83
84 /*
85 * Support for sysctl vfs.nlm.sysid
86 */
87 static SYSCTL_NODE(_vfs, OID_AUTO, nlm, CTLFLAG_RW, NULL,
88 "Network Lock Manager");
89 static SYSCTL_NODE(_vfs_nlm, OID_AUTO, sysid, CTLFLAG_RW, NULL, "");
90
91 /*
92 * Syscall hooks
93 */
94 static int nlm_syscall_offset = SYS_nlm_syscall;
95 static struct sysent nlm_syscall_prev_sysent;
96 #if __FreeBSD_version < 700000
97 static struct sysent nlm_syscall_sysent = {
98 (sizeof(struct nlm_syscall_args) / sizeof(register_t)) | SYF_MPSAFE,
99 (sy_call_t *) nlm_syscall
100 };
101 #else
102 MAKE_SYSENT(nlm_syscall);
103 #endif
104 static bool_t nlm_syscall_registered = FALSE;
105
106 /*
107 * Debug level passed in from userland. We also support a sysctl hook
108 * so that it can be changed on a live system.
109 */
110 static int nlm_debug_level;
111 SYSCTL_INT(_debug, OID_AUTO, nlm_debug, CTLFLAG_RW, &nlm_debug_level, 0, "");
112
113 #define NLM_DEBUG(_level, args...) \
114 do { \
115 if (nlm_debug_level >= (_level)) \
116 log(LOG_DEBUG, args); \
117 } while(0)
118 #define NLM_ERR(args...) \
119 do { \
120 log(LOG_ERR, args); \
121 } while(0)
122
123 /*
124 * Grace period handling. The value of nlm_grace_threshold is the
125 * value of time_uptime after which we are serving requests normally.
126 */
127 static time_t nlm_grace_threshold;
128
129 /*
130 * We check for idle hosts if time_uptime is greater than
131 * nlm_next_idle_check,
132 */
133 static time_t nlm_next_idle_check;
134
135 /*
136 * A flag to indicate the server is already running.
137 */
138 static int nlm_is_running;
139
140 /*
141 * A socket to use for RPC - shared by all IPv4 RPC clients.
142 */
143 static struct socket *nlm_socket;
144
145 #ifdef INET6
146
147 /*
148 * A socket to use for RPC - shared by all IPv6 RPC clients.
149 */
150 static struct socket *nlm_socket6;
151
152 #endif
153
154 /*
155 * An RPC client handle that can be used to communicate with the local
156 * NSM.
157 */
158 static CLIENT *nlm_nsm;
159
160 /*
161 * An AUTH handle for the server's creds.
162 */
163 static AUTH *nlm_auth;
164
165 /*
166 * A zero timeval for sending async RPC messages.
167 */
168 struct timeval nlm_zero_tv = { 0, 0 };
169
170 /*
171 * The local NSM state number
172 */
173 int nlm_nsm_state;
174
175
176 /*
177 * A lock to protect the host list and waiting lock list.
178 */
179 static struct mtx nlm_global_lock;
180
181 /*
182 * Locks:
183 * (l) locked by nh_lock
184 * (s) only accessed via server RPC which is single threaded
185 * (g) locked by nlm_global_lock
186 * (c) const until freeing
187 * (a) modified using atomic ops
188 */
189
190 /*
191 * A pending client-side lock request, stored on the nlm_waiting_locks
192 * list.
193 */
194 struct nlm_waiting_lock {
195 TAILQ_ENTRY(nlm_waiting_lock) nw_link; /* (g) */
196 bool_t nw_waiting; /* (g) */
197 nlm4_lock nw_lock; /* (c) */
198 union nfsfh nw_fh; /* (c) */
199 struct vnode *nw_vp; /* (c) */
200 };
201 TAILQ_HEAD(nlm_waiting_lock_list, nlm_waiting_lock);
202
203 struct nlm_waiting_lock_list nlm_waiting_locks; /* (g) */
204
205 /*
206 * A pending server-side asynchronous lock request, stored on the
207 * nh_pending list of the NLM host.
208 */
209 struct nlm_async_lock {
210 TAILQ_ENTRY(nlm_async_lock) af_link; /* (l) host's list of locks */
211 struct task af_task; /* (c) async callback details */
212 void *af_cookie; /* (l) lock manager cancel token */
213 struct vnode *af_vp; /* (l) vnode to lock */
214 struct flock af_fl; /* (c) lock details */
215 struct nlm_host *af_host; /* (c) host which is locking */
216 CLIENT *af_rpc; /* (c) rpc client to send message */
217 nlm4_testargs af_granted; /* (c) notification details */
218 time_t af_expiretime; /* (c) notification time */
219 };
220 TAILQ_HEAD(nlm_async_lock_list, nlm_async_lock);
221
222 /*
223 * NLM host.
224 */
225 enum nlm_host_state {
226 NLM_UNMONITORED,
227 NLM_MONITORED,
228 NLM_MONITOR_FAILED,
229 NLM_RECOVERING
230 };
231
232 struct nlm_rpc {
233 CLIENT *nr_client; /* (l) RPC client handle */
234 time_t nr_create_time; /* (l) when client was created */
235 };
236
237 struct nlm_host {
238 struct mtx nh_lock;
239 volatile u_int nh_refs; /* (a) reference count */
240 TAILQ_ENTRY(nlm_host) nh_link; /* (g) global list of hosts */
241 char nh_caller_name[MAXNAMELEN]; /* (c) printable name of host */
242 uint32_t nh_sysid; /* (c) our allocaed system ID */
243 char nh_sysid_string[10]; /* (c) string rep. of sysid */
244 struct sockaddr_storage nh_addr; /* (s) remote address of host */
245 struct nlm_rpc nh_srvrpc; /* (l) RPC for server replies */
246 struct nlm_rpc nh_clntrpc; /* (l) RPC for client requests */
247 rpcvers_t nh_vers; /* (s) NLM version of host */
248 int nh_state; /* (s) last seen NSM state of host */
249 enum nlm_host_state nh_monstate; /* (l) local NSM monitoring state */
250 time_t nh_idle_timeout; /* (s) Time at which host is idle */
251 struct sysctl_ctx_list nh_sysctl; /* (c) vfs.nlm.sysid nodes */
252 uint32_t nh_grantcookie; /* (l) grant cookie counter */
253 struct nlm_async_lock_list nh_pending; /* (l) pending async locks */
254 struct nlm_async_lock_list nh_granted; /* (l) granted locks */
255 struct nlm_async_lock_list nh_finished; /* (l) finished async locks */
256 };
257 TAILQ_HEAD(nlm_host_list, nlm_host);
258
259 static struct nlm_host_list nlm_hosts; /* (g) */
260 static uint32_t nlm_next_sysid = 1; /* (g) */
261
262 static void nlm_host_unmonitor(struct nlm_host *);
263
264 struct nlm_grantcookie {
265 uint32_t ng_sysid;
266 uint32_t ng_cookie;
267 };
268
269 static inline uint32_t
270 ng_sysid(struct netobj *src)
271 {
272
273 return ((struct nlm_grantcookie *)src->n_bytes)->ng_sysid;
274 }
275
276 static inline uint32_t
277 ng_cookie(struct netobj *src)
278 {
279
280 return ((struct nlm_grantcookie *)src->n_bytes)->ng_cookie;
281 }
282
283 /**********************************************************************/
284
285 /*
286 * Initialise NLM globals.
287 */
288 static void
289 nlm_init(void *dummy)
290 {
291 int error;
292
293 mtx_init(&nlm_global_lock, "nlm_global_lock", NULL, MTX_DEF);
294 TAILQ_INIT(&nlm_waiting_locks);
295 TAILQ_INIT(&nlm_hosts);
296
297 error = syscall_register(&nlm_syscall_offset, &nlm_syscall_sysent,
298 &nlm_syscall_prev_sysent);
299 if (error)
300 NLM_ERR("Can't register NLM syscall\n");
301 else
302 nlm_syscall_registered = TRUE;
303 }
304 SYSINIT(nlm_init, SI_SUB_LOCK, SI_ORDER_FIRST, nlm_init, NULL);
305
306 static void
307 nlm_uninit(void *dummy)
308 {
309
310 if (nlm_syscall_registered)
311 syscall_deregister(&nlm_syscall_offset,
312 &nlm_syscall_prev_sysent);
313 }
314 SYSUNINIT(nlm_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, nlm_uninit, NULL);
315
316 /*
317 * Create a netobj from an arbitrary source.
318 */
319 void
320 nlm_make_netobj(struct netobj *dst, caddr_t src, size_t srcsize,
321 struct malloc_type *type)
322 {
323
324 dst->n_len = srcsize;
325 dst->n_bytes = malloc(srcsize, type, M_WAITOK);
326 memcpy(dst->n_bytes, src, srcsize);
327 }
328
329 /*
330 * Copy a struct netobj.
331 */
332 void
333 nlm_copy_netobj(struct netobj *dst, struct netobj *src,
334 struct malloc_type *type)
335 {
336
337 nlm_make_netobj(dst, src->n_bytes, src->n_len, type);
338 }
339
340
341 /*
342 * Create an RPC client handle for the given (address,prog,vers)
343 * triple using UDP.
344 */
345 static CLIENT *
346 nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers)
347 {
348 char *wchan = "nlmrcv";
349 const char* protofmly;
350 struct sockaddr_storage ss;
351 struct socket *so;
352 CLIENT *rpcb;
353 struct timeval timo;
354 RPCB parms;
355 char *uaddr;
356 enum clnt_stat stat = RPC_SUCCESS;
357 int rpcvers = RPCBVERS4;
358 bool_t do_tcp = FALSE;
359 bool_t tryagain = FALSE;
360 struct portmap mapping;
361 u_short port = 0;
362
363 /*
364 * First we need to contact the remote RPCBIND service to find
365 * the right port.
366 */
367 memcpy(&ss, sa, sa->sa_len);
368 switch (ss.ss_family) {
369 case AF_INET:
370 ((struct sockaddr_in *)&ss)->sin_port = htons(111);
371 protofmly = "inet";
372 so = nlm_socket;
373 break;
374
375 #ifdef INET6
376 case AF_INET6:
377 ((struct sockaddr_in6 *)&ss)->sin6_port = htons(111);
378 protofmly = "inet6";
379 so = nlm_socket6;
380 break;
381 #endif
382
383 default:
384 /*
385 * Unsupported address family - fail.
386 */
387 return (NULL);
388 }
389
390 rpcb = clnt_dg_create(so, (struct sockaddr *)&ss,
391 RPCBPROG, rpcvers, 0, 0);
392 if (!rpcb)
393 return (NULL);
394
395 try_tcp:
396 parms.r_prog = prog;
397 parms.r_vers = vers;
398 if (do_tcp)
399 parms.r_netid = "tcp";
400 else
401 parms.r_netid = "udp";
402 parms.r_addr = "";
403 parms.r_owner = "";
404
405 /*
406 * Use the default timeout.
407 */
408 timo.tv_sec = 25;
409 timo.tv_usec = 0;
410 again:
411 switch (rpcvers) {
412 case RPCBVERS4:
413 case RPCBVERS:
414 /*
415 * Try RPCBIND 4 then 3.
416 */
417 uaddr = NULL;
418 stat = CLNT_CALL(rpcb, (rpcprog_t) RPCBPROC_GETADDR,
419 (xdrproc_t) xdr_rpcb, &parms,
420 (xdrproc_t) xdr_wrapstring, &uaddr, timo);
421 if (stat == RPC_SUCCESS) {
422 /*
423 * We have a reply from the remote RPCBIND - turn it
424 * into an appropriate address and make a new client
425 * that can talk to the remote NLM.
426 *
427 * XXX fixup IPv6 scope ID.
428 */
429 struct netbuf *a;
430 a = __rpc_uaddr2taddr_af(ss.ss_family, uaddr);
431 if (!a) {
432 tryagain = TRUE;
433 } else {
434 tryagain = FALSE;
435 memcpy(&ss, a->buf, a->len);
436 free(a->buf, M_RPC);
437 free(a, M_RPC);
438 xdr_free((xdrproc_t) xdr_wrapstring, &uaddr);
439 }
440 }
441 if (tryagain || stat == RPC_PROGVERSMISMATCH) {
442 if (rpcvers == RPCBVERS4)
443 rpcvers = RPCBVERS;
444 else if (rpcvers == RPCBVERS)
445 rpcvers = PMAPVERS;
446 CLNT_CONTROL(rpcb, CLSET_VERS, &rpcvers);
447 goto again;
448 }
449 break;
450 case PMAPVERS:
451 /*
452 * Try portmap.
453 */
454 mapping.pm_prog = parms.r_prog;
455 mapping.pm_vers = parms.r_vers;
456 mapping.pm_prot = do_tcp ? IPPROTO_TCP : IPPROTO_UDP;
457 mapping.pm_port = 0;
458
459 stat = CLNT_CALL(rpcb, (rpcprog_t) PMAPPROC_GETPORT,
460 (xdrproc_t) xdr_portmap, &mapping,
461 (xdrproc_t) xdr_u_short, &port, timo);
462
463 if (stat == RPC_SUCCESS) {
464 switch (ss.ss_family) {
465 case AF_INET:
466 ((struct sockaddr_in *)&ss)->sin_port =
467 htons(port);
468 break;
469
470 #ifdef INET6
471 case AF_INET6:
472 ((struct sockaddr_in6 *)&ss)->sin6_port =
473 htons(port);
474 break;
475 #endif
476 }
477 }
478 break;
479 default:
480 panic("invalid rpcvers %d", rpcvers);
481 }
482 /*
483 * We may have a positive response from the portmapper, but the NLM
484 * service was not found. Make sure we received a valid port.
485 */
486 switch (ss.ss_family) {
487 case AF_INET:
488 port = ((struct sockaddr_in *)&ss)->sin_port;
489 break;
490 #ifdef INET6
491 case AF_INET6:
492 port = ((struct sockaddr_in6 *)&ss)->sin6_port;
493 break;
494 #endif
495 }
496 if (stat != RPC_SUCCESS || !port) {
497 /*
498 * If we were able to talk to rpcbind or portmap, but the udp
499 * variant wasn't available, ask about tcp.
500 *
501 * XXX - We could also check for a TCP portmapper, but
502 * if the host is running a portmapper at all, we should be able
503 * to hail it over UDP.
504 */
505 if (stat == RPC_SUCCESS && !do_tcp) {
506 do_tcp = TRUE;
507 goto try_tcp;
508 }
509
510 /* Otherwise, bad news. */
511 NLM_ERR("NLM: failed to contact remote rpcbind, "
512 "stat = %d, port = %d\n", (int) stat, port);
513 CLNT_DESTROY(rpcb);
514 return (NULL);
515 }
516
517 if (do_tcp) {
518 /*
519 * Destroy the UDP client we used to speak to rpcbind and
520 * recreate as a TCP client.
521 */
522 struct netconfig *nconf = NULL;
523
524 CLNT_DESTROY(rpcb);
525
526 switch (ss.ss_family) {
527 case AF_INET:
528 nconf = getnetconfigent("tcp");
529 break;
530 #ifdef INET6
531 case AF_INET6:
532 nconf = getnetconfigent("tcp6");
533 break;
534 #endif
535 }
536
537 rpcb = clnt_reconnect_create(nconf, (struct sockaddr *)&ss,
538 prog, vers, 0, 0);
539 CLNT_CONTROL(rpcb, CLSET_WAITCHAN, wchan);
540 rpcb->cl_auth = nlm_auth;
541
542 } else {
543 /*
544 * Re-use the client we used to speak to rpcbind.
545 */
546 CLNT_CONTROL(rpcb, CLSET_SVC_ADDR, &ss);
547 CLNT_CONTROL(rpcb, CLSET_PROG, &prog);
548 CLNT_CONTROL(rpcb, CLSET_VERS, &vers);
549 CLNT_CONTROL(rpcb, CLSET_WAITCHAN, wchan);
550 rpcb->cl_auth = nlm_auth;
551 }
552
553 return (rpcb);
554 }
555
556 /*
557 * This async callback after when an async lock request has been
558 * granted. We notify the host which initiated the request.
559 */
560 static void
561 nlm_lock_callback(void *arg, int pending)
562 {
563 struct nlm_async_lock *af = (struct nlm_async_lock *) arg;
564 struct rpc_callextra ext;
565
566 NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) granted,"
567 " cookie %d:%d\n", af, af->af_host->nh_caller_name,
568 af->af_host->nh_sysid, ng_sysid(&af->af_granted.cookie),
569 ng_cookie(&af->af_granted.cookie));
570
571 /*
572 * Send the results back to the host.
573 *
574 * Note: there is a possible race here with nlm_host_notify
575 * destroying the RPC client. To avoid problems, the first
576 * thing nlm_host_notify does is to cancel pending async lock
577 * requests.
578 */
579 memset(&ext, 0, sizeof(ext));
580 ext.rc_auth = nlm_auth;
581 if (af->af_host->nh_vers == NLM_VERS4) {
582 nlm4_granted_msg_4(&af->af_granted,
583 NULL, af->af_rpc, &ext, nlm_zero_tv);
584 } else {
585 /*
586 * Back-convert to legacy protocol
587 */
588 nlm_testargs granted;
589 granted.cookie = af->af_granted.cookie;
590 granted.exclusive = af->af_granted.exclusive;
591 granted.alock.caller_name =
592 af->af_granted.alock.caller_name;
593 granted.alock.fh = af->af_granted.alock.fh;
594 granted.alock.oh = af->af_granted.alock.oh;
595 granted.alock.svid = af->af_granted.alock.svid;
596 granted.alock.l_offset =
597 af->af_granted.alock.l_offset;
598 granted.alock.l_len =
599 af->af_granted.alock.l_len;
600
601 nlm_granted_msg_1(&granted,
602 NULL, af->af_rpc, &ext, nlm_zero_tv);
603 }
604
605 /*
606 * Move this entry to the nh_granted list.
607 */
608 af->af_expiretime = time_uptime + NLM_EXPIRE_TIMEOUT;
609 mtx_lock(&af->af_host->nh_lock);
610 TAILQ_REMOVE(&af->af_host->nh_pending, af, af_link);
611 TAILQ_INSERT_TAIL(&af->af_host->nh_granted, af, af_link);
612 mtx_unlock(&af->af_host->nh_lock);
613 }
614
615 /*
616 * Free an async lock request. The request must have been removed from
617 * any list.
618 */
619 static void
620 nlm_free_async_lock(struct nlm_async_lock *af)
621 {
622 /*
623 * Free an async lock.
624 */
625 if (af->af_rpc)
626 CLNT_RELEASE(af->af_rpc);
627 xdr_free((xdrproc_t) xdr_nlm4_testargs, &af->af_granted);
628 if (af->af_vp)
629 vrele(af->af_vp);
630 free(af, M_NLM);
631 }
632
633 /*
634 * Cancel our async request - this must be called with
635 * af->nh_host->nh_lock held. This is slightly complicated by a
636 * potential race with our own callback. If we fail to cancel the
637 * lock, it must already have been granted - we make sure our async
638 * task has completed by calling taskqueue_drain in this case.
639 */
640 static int
641 nlm_cancel_async_lock(struct nlm_async_lock *af)
642 {
643 struct nlm_host *host = af->af_host;
644 int error;
645
646 mtx_assert(&host->nh_lock, MA_OWNED);
647
648 mtx_unlock(&host->nh_lock);
649
650 error = VOP_ADVLOCKASYNC(af->af_vp, NULL, F_CANCEL, &af->af_fl,
651 F_REMOTE, NULL, &af->af_cookie);
652
653 if (error) {
654 /*
655 * We failed to cancel - make sure our callback has
656 * completed before we continue.
657 */
658 taskqueue_drain(taskqueue_thread, &af->af_task);
659 }
660
661 mtx_lock(&host->nh_lock);
662
663 if (!error) {
664 NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) "
665 "cancelled\n", af, host->nh_caller_name, host->nh_sysid);
666
667 /*
668 * Remove from the nh_pending list and free now that
669 * we are safe from the callback.
670 */
671 TAILQ_REMOVE(&host->nh_pending, af, af_link);
672 mtx_unlock(&host->nh_lock);
673 nlm_free_async_lock(af);
674 mtx_lock(&host->nh_lock);
675 }
676
677 return (error);
678 }
679
680 static void
681 nlm_check_expired_locks(struct nlm_host *host)
682 {
683 struct nlm_async_lock *af;
684 time_t uptime = time_uptime;
685
686 mtx_lock(&host->nh_lock);
687 while ((af = TAILQ_FIRST(&host->nh_granted)) != NULL
688 && uptime >= af->af_expiretime) {
689 NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) expired,"
690 " cookie %d:%d\n", af, af->af_host->nh_caller_name,
691 af->af_host->nh_sysid, ng_sysid(&af->af_granted.cookie),
692 ng_cookie(&af->af_granted.cookie));
693 TAILQ_REMOVE(&host->nh_granted, af, af_link);
694 mtx_unlock(&host->nh_lock);
695 nlm_free_async_lock(af);
696 mtx_lock(&host->nh_lock);
697 }
698 while ((af = TAILQ_FIRST(&host->nh_finished)) != NULL) {
699 TAILQ_REMOVE(&host->nh_finished, af, af_link);
700 mtx_unlock(&host->nh_lock);
701 nlm_free_async_lock(af);
702 mtx_lock(&host->nh_lock);
703 }
704 mtx_unlock(&host->nh_lock);
705 }
706
707 /*
708 * Free resources used by a host. This is called after the reference
709 * count has reached zero so it doesn't need to worry about locks.
710 */
711 static void
712 nlm_host_destroy(struct nlm_host *host)
713 {
714
715 mtx_lock(&nlm_global_lock);
716 TAILQ_REMOVE(&nlm_hosts, host, nh_link);
717 mtx_unlock(&nlm_global_lock);
718
719 if (host->nh_srvrpc.nr_client)
720 CLNT_RELEASE(host->nh_srvrpc.nr_client);
721 if (host->nh_clntrpc.nr_client)
722 CLNT_RELEASE(host->nh_clntrpc.nr_client);
723 mtx_destroy(&host->nh_lock);
724 sysctl_ctx_free(&host->nh_sysctl);
725 free(host, M_NLM);
726 }
727
728 /*
729 * Thread start callback for client lock recovery
730 */
731 static void
732 nlm_client_recovery_start(void *arg)
733 {
734 struct nlm_host *host = (struct nlm_host *) arg;
735
736 NLM_DEBUG(1, "NLM: client lock recovery for %s started\n",
737 host->nh_caller_name);
738
739 nlm_client_recovery(host);
740
741 NLM_DEBUG(1, "NLM: client lock recovery for %s completed\n",
742 host->nh_caller_name);
743
744 host->nh_monstate = NLM_MONITORED;
745 nlm_host_release(host);
746
747 kthread_exit();
748 }
749
750 /*
751 * This is called when we receive a host state change notification. We
752 * unlock any active locks owned by the host. When rpc.lockd is
753 * shutting down, this function is called with newstate set to zero
754 * which allows us to cancel any pending async locks and clear the
755 * locking state.
756 */
757 static void
758 nlm_host_notify(struct nlm_host *host, int newstate)
759 {
760 struct nlm_async_lock *af;
761
762 if (newstate) {
763 NLM_DEBUG(1, "NLM: host %s (sysid %d) rebooted, new "
764 "state is %d\n", host->nh_caller_name,
765 host->nh_sysid, newstate);
766 }
767
768 /*
769 * Cancel any pending async locks for this host.
770 */
771 mtx_lock(&host->nh_lock);
772 while ((af = TAILQ_FIRST(&host->nh_pending)) != NULL) {
773 /*
774 * nlm_cancel_async_lock will remove the entry from
775 * nh_pending and free it.
776 */
777 nlm_cancel_async_lock(af);
778 }
779 mtx_unlock(&host->nh_lock);
780 nlm_check_expired_locks(host);
781
782 /*
783 * The host just rebooted - trash its locks.
784 */
785 lf_clearremotesys(host->nh_sysid);
786 host->nh_state = newstate;
787
788 /*
789 * If we have any remote locks for this host (i.e. it
790 * represents a remote NFS server that our local NFS client
791 * has locks for), start a recovery thread.
792 */
793 if (newstate != 0
794 && host->nh_monstate != NLM_RECOVERING
795 && lf_countlocks(NLM_SYSID_CLIENT | host->nh_sysid) > 0) {
796 struct thread *td;
797 host->nh_monstate = NLM_RECOVERING;
798 refcount_acquire(&host->nh_refs);
799 kthread_add(nlm_client_recovery_start, host, curproc, &td, 0, 0,
800 "NFS lock recovery for %s", host->nh_caller_name);
801 }
802 }
803
804 /*
805 * Sysctl handler to count the number of locks for a sysid.
806 */
807 static int
808 nlm_host_lock_count_sysctl(SYSCTL_HANDLER_ARGS)
809 {
810 struct nlm_host *host;
811 int count;
812
813 host = oidp->oid_arg1;
814 count = lf_countlocks(host->nh_sysid);
815 return sysctl_handle_int(oidp, &count, 0, req);
816 }
817
818 /*
819 * Sysctl handler to count the number of client locks for a sysid.
820 */
821 static int
822 nlm_host_client_lock_count_sysctl(SYSCTL_HANDLER_ARGS)
823 {
824 struct nlm_host *host;
825 int count;
826
827 host = oidp->oid_arg1;
828 count = lf_countlocks(NLM_SYSID_CLIENT | host->nh_sysid);
829 return sysctl_handle_int(oidp, &count, 0, req);
830 }
831
832 /*
833 * Create a new NLM host.
834 */
835 static struct nlm_host *
836 nlm_create_host(const char* caller_name)
837 {
838 struct nlm_host *host;
839 struct sysctl_oid *oid;
840
841 mtx_assert(&nlm_global_lock, MA_OWNED);
842
843 NLM_DEBUG(1, "NLM: new host %s (sysid %d)\n",
844 caller_name, nlm_next_sysid);
845 host = malloc(sizeof(struct nlm_host), M_NLM, M_NOWAIT|M_ZERO);
846 if (!host)
847 return (NULL);
848 mtx_init(&host->nh_lock, "nh_lock", NULL, MTX_DEF);
849 host->nh_refs = 1;
850 strlcpy(host->nh_caller_name, caller_name, MAXNAMELEN);
851 host->nh_sysid = nlm_next_sysid++;
852 snprintf(host->nh_sysid_string, sizeof(host->nh_sysid_string),
853 "%d", host->nh_sysid);
854 host->nh_vers = 0;
855 host->nh_state = 0;
856 host->nh_monstate = NLM_UNMONITORED;
857 host->nh_grantcookie = 1;
858 TAILQ_INIT(&host->nh_pending);
859 TAILQ_INIT(&host->nh_granted);
860 TAILQ_INIT(&host->nh_finished);
861 TAILQ_INSERT_TAIL(&nlm_hosts, host, nh_link);
862
863 mtx_unlock(&nlm_global_lock);
864
865 sysctl_ctx_init(&host->nh_sysctl);
866 oid = SYSCTL_ADD_NODE(&host->nh_sysctl,
867 SYSCTL_STATIC_CHILDREN(_vfs_nlm_sysid),
868 OID_AUTO, host->nh_sysid_string, CTLFLAG_RD, NULL, "");
869 SYSCTL_ADD_STRING(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
870 "hostname", CTLFLAG_RD, host->nh_caller_name, 0, "");
871 SYSCTL_ADD_UINT(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
872 "version", CTLFLAG_RD, &host->nh_vers, 0, "");
873 SYSCTL_ADD_UINT(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
874 "monitored", CTLFLAG_RD, &host->nh_monstate, 0, "");
875 SYSCTL_ADD_PROC(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
876 "lock_count", CTLTYPE_INT | CTLFLAG_RD, host, 0,
877 nlm_host_lock_count_sysctl, "I", "");
878 SYSCTL_ADD_PROC(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO,
879 "client_lock_count", CTLTYPE_INT | CTLFLAG_RD, host, 0,
880 nlm_host_client_lock_count_sysctl, "I", "");
881
882 mtx_lock(&nlm_global_lock);
883
884 return (host);
885 }
886
887 /*
888 * Acquire the next sysid for remote locks not handled by the NLM.
889 */
890 uint32_t
891 nlm_acquire_next_sysid(void)
892 {
893 uint32_t next_sysid;
894
895 mtx_lock(&nlm_global_lock);
896 next_sysid = nlm_next_sysid++;
897 mtx_unlock(&nlm_global_lock);
898 return (next_sysid);
899 }
900
901 /*
902 * Return non-zero if the address parts of the two sockaddrs are the
903 * same.
904 */
905 static int
906 nlm_compare_addr(const struct sockaddr *a, const struct sockaddr *b)
907 {
908 const struct sockaddr_in *a4, *b4;
909 #ifdef INET6
910 const struct sockaddr_in6 *a6, *b6;
911 #endif
912
913 if (a->sa_family != b->sa_family)
914 return (FALSE);
915
916 switch (a->sa_family) {
917 case AF_INET:
918 a4 = (const struct sockaddr_in *) a;
919 b4 = (const struct sockaddr_in *) b;
920 return !memcmp(&a4->sin_addr, &b4->sin_addr,
921 sizeof(a4->sin_addr));
922 #ifdef INET6
923 case AF_INET6:
924 a6 = (const struct sockaddr_in6 *) a;
925 b6 = (const struct sockaddr_in6 *) b;
926 return !memcmp(&a6->sin6_addr, &b6->sin6_addr,
927 sizeof(a6->sin6_addr));
928 #endif
929 }
930
931 return (0);
932 }
933
934 /*
935 * Check for idle hosts and stop monitoring them. We could also free
936 * the host structure here, possibly after a larger timeout but that
937 * would require some care to avoid races with
938 * e.g. nlm_host_lock_count_sysctl.
939 */
940 static void
941 nlm_check_idle(void)
942 {
943 struct nlm_host *host;
944
945 mtx_assert(&nlm_global_lock, MA_OWNED);
946
947 if (time_uptime <= nlm_next_idle_check)
948 return;
949
950 nlm_next_idle_check = time_uptime + NLM_IDLE_PERIOD;
951
952 TAILQ_FOREACH(host, &nlm_hosts, nh_link) {
953 if (host->nh_monstate == NLM_MONITORED
954 && time_uptime > host->nh_idle_timeout) {
955 mtx_unlock(&nlm_global_lock);
956 if (lf_countlocks(host->nh_sysid) > 0
957 || lf_countlocks(NLM_SYSID_CLIENT
958 + host->nh_sysid)) {
959 host->nh_idle_timeout =
960 time_uptime + NLM_IDLE_TIMEOUT;
961 mtx_lock(&nlm_global_lock);
962 continue;
963 }
964 nlm_host_unmonitor(host);
965 mtx_lock(&nlm_global_lock);
966 }
967 }
968 }
969
970 /*
971 * Search for an existing NLM host that matches the given name
972 * (typically the caller_name element of an nlm4_lock). If none is
973 * found, create a new host. If 'addr' is non-NULL, record the remote
974 * address of the host so that we can call it back for async
975 * responses. If 'vers' is greater than zero then record the NLM
976 * program version to use to communicate with this client.
977 */
978 struct nlm_host *
979 nlm_find_host_by_name(const char *name, const struct sockaddr *addr,
980 rpcvers_t vers)
981 {
982 struct nlm_host *host;
983
984 mtx_lock(&nlm_global_lock);
985
986 /*
987 * The remote host is determined by caller_name.
988 */
989 TAILQ_FOREACH(host, &nlm_hosts, nh_link) {
990 if (!strcmp(host->nh_caller_name, name))
991 break;
992 }
993
994 if (!host) {
995 host = nlm_create_host(name);
996 if (!host) {
997 mtx_unlock(&nlm_global_lock);
998 return (NULL);
999 }
1000 }
1001 refcount_acquire(&host->nh_refs);
1002
1003 host->nh_idle_timeout = time_uptime + NLM_IDLE_TIMEOUT;
1004
1005 /*
1006 * If we have an address for the host, record it so that we
1007 * can send async replies etc.
1008 */
1009 if (addr) {
1010
1011 KASSERT(addr->sa_len < sizeof(struct sockaddr_storage),
1012 ("Strange remote transport address length"));
1013
1014 /*
1015 * If we have seen an address before and we currently
1016 * have an RPC client handle, make sure the address is
1017 * the same, otherwise discard the client handle.
1018 */
1019 if (host->nh_addr.ss_len && host->nh_srvrpc.nr_client) {
1020 if (!nlm_compare_addr(
1021 (struct sockaddr *) &host->nh_addr,
1022 addr)
1023 || host->nh_vers != vers) {
1024 CLIENT *client;
1025 mtx_lock(&host->nh_lock);
1026 client = host->nh_srvrpc.nr_client;
1027 host->nh_srvrpc.nr_client = NULL;
1028 mtx_unlock(&host->nh_lock);
1029 if (client) {
1030 CLNT_RELEASE(client);
1031 }
1032 }
1033 }
1034 memcpy(&host->nh_addr, addr, addr->sa_len);
1035 host->nh_vers = vers;
1036 }
1037
1038 nlm_check_idle();
1039
1040 mtx_unlock(&nlm_global_lock);
1041
1042 return (host);
1043 }
1044
1045 /*
1046 * Search for an existing NLM host that matches the given remote
1047 * address. If none is found, create a new host with the requested
1048 * address and remember 'vers' as the NLM protocol version to use for
1049 * that host.
1050 */
1051 struct nlm_host *
1052 nlm_find_host_by_addr(const struct sockaddr *addr, int vers)
1053 {
1054 /*
1055 * Fake up a name using inet_ntop. This buffer is
1056 * large enough for an IPv6 address.
1057 */
1058 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
1059 struct nlm_host *host;
1060
1061 switch (addr->sa_family) {
1062 case AF_INET:
1063 inet_ntop(AF_INET,
1064 &((const struct sockaddr_in *) addr)->sin_addr,
1065 tmp, sizeof tmp);
1066 break;
1067 #ifdef INET6
1068 case AF_INET6:
1069 inet_ntop(AF_INET6,
1070 &((const struct sockaddr_in6 *) addr)->sin6_addr,
1071 tmp, sizeof tmp);
1072 break;
1073 #endif
1074 default:
1075 strlcpy(tmp, "<unknown>", sizeof(tmp));
1076 }
1077
1078
1079 mtx_lock(&nlm_global_lock);
1080
1081 /*
1082 * The remote host is determined by caller_name.
1083 */
1084 TAILQ_FOREACH(host, &nlm_hosts, nh_link) {
1085 if (nlm_compare_addr(addr,
1086 (const struct sockaddr *) &host->nh_addr))
1087 break;
1088 }
1089
1090 if (!host) {
1091 host = nlm_create_host(tmp);
1092 if (!host) {
1093 mtx_unlock(&nlm_global_lock);
1094 return (NULL);
1095 }
1096 memcpy(&host->nh_addr, addr, addr->sa_len);
1097 host->nh_vers = vers;
1098 }
1099 refcount_acquire(&host->nh_refs);
1100
1101 host->nh_idle_timeout = time_uptime + NLM_IDLE_TIMEOUT;
1102
1103 nlm_check_idle();
1104
1105 mtx_unlock(&nlm_global_lock);
1106
1107 return (host);
1108 }
1109
1110 /*
1111 * Find the NLM host that matches the value of 'sysid'. If none
1112 * exists, return NULL.
1113 */
1114 static struct nlm_host *
1115 nlm_find_host_by_sysid(int sysid)
1116 {
1117 struct nlm_host *host;
1118
1119 TAILQ_FOREACH(host, &nlm_hosts, nh_link) {
1120 if (host->nh_sysid == sysid) {
1121 refcount_acquire(&host->nh_refs);
1122 return (host);
1123 }
1124 }
1125
1126 return (NULL);
1127 }
1128
1129 void nlm_host_release(struct nlm_host *host)
1130 {
1131 if (refcount_release(&host->nh_refs)) {
1132 /*
1133 * Free the host
1134 */
1135 nlm_host_destroy(host);
1136 }
1137 }
1138
1139 /*
1140 * Unregister this NLM host with the local NSM due to idleness.
1141 */
1142 static void
1143 nlm_host_unmonitor(struct nlm_host *host)
1144 {
1145 mon_id smmonid;
1146 sm_stat_res smstat;
1147 struct timeval timo;
1148 enum clnt_stat stat;
1149
1150 NLM_DEBUG(1, "NLM: unmonitoring %s (sysid %d)\n",
1151 host->nh_caller_name, host->nh_sysid);
1152
1153 /*
1154 * We put our assigned system ID value in the priv field to
1155 * make it simpler to find the host if we are notified of a
1156 * host restart.
1157 */
1158 smmonid.mon_name = host->nh_caller_name;
1159 smmonid.my_id.my_name = "localhost";
1160 smmonid.my_id.my_prog = NLM_PROG;
1161 smmonid.my_id.my_vers = NLM_SM;
1162 smmonid.my_id.my_proc = NLM_SM_NOTIFY;
1163
1164 timo.tv_sec = 25;
1165 timo.tv_usec = 0;
1166 stat = CLNT_CALL(nlm_nsm, SM_UNMON,
1167 (xdrproc_t) xdr_mon, &smmonid,
1168 (xdrproc_t) xdr_sm_stat, &smstat, timo);
1169
1170 if (stat != RPC_SUCCESS) {
1171 NLM_ERR("Failed to contact local NSM - rpc error %d\n", stat);
1172 return;
1173 }
1174 if (smstat.res_stat == stat_fail) {
1175 NLM_ERR("Local NSM refuses to unmonitor %s\n",
1176 host->nh_caller_name);
1177 return;
1178 }
1179
1180 host->nh_monstate = NLM_UNMONITORED;
1181 }
1182
1183 /*
1184 * Register this NLM host with the local NSM so that we can be
1185 * notified if it reboots.
1186 */
1187 void
1188 nlm_host_monitor(struct nlm_host *host, int state)
1189 {
1190 mon smmon;
1191 sm_stat_res smstat;
1192 struct timeval timo;
1193 enum clnt_stat stat;
1194
1195 if (state && !host->nh_state) {
1196 /*
1197 * This is the first time we have seen an NSM state
1198 * value for this host. We record it here to help
1199 * detect host reboots.
1200 */
1201 host->nh_state = state;
1202 NLM_DEBUG(1, "NLM: host %s (sysid %d) has NSM state %d\n",
1203 host->nh_caller_name, host->nh_sysid, state);
1204 }
1205
1206 mtx_lock(&host->nh_lock);
1207 if (host->nh_monstate != NLM_UNMONITORED) {
1208 mtx_unlock(&host->nh_lock);
1209 return;
1210 }
1211 host->nh_monstate = NLM_MONITORED;
1212 mtx_unlock(&host->nh_lock);
1213
1214 NLM_DEBUG(1, "NLM: monitoring %s (sysid %d)\n",
1215 host->nh_caller_name, host->nh_sysid);
1216
1217 /*
1218 * We put our assigned system ID value in the priv field to
1219 * make it simpler to find the host if we are notified of a
1220 * host restart.
1221 */
1222 smmon.mon_id.mon_name = host->nh_caller_name;
1223 smmon.mon_id.my_id.my_name = "localhost";
1224 smmon.mon_id.my_id.my_prog = NLM_PROG;
1225 smmon.mon_id.my_id.my_vers = NLM_SM;
1226 smmon.mon_id.my_id.my_proc = NLM_SM_NOTIFY;
1227 memcpy(smmon.priv, &host->nh_sysid, sizeof(host->nh_sysid));
1228
1229 timo.tv_sec = 25;
1230 timo.tv_usec = 0;
1231 stat = CLNT_CALL(nlm_nsm, SM_MON,
1232 (xdrproc_t) xdr_mon, &smmon,
1233 (xdrproc_t) xdr_sm_stat, &smstat, timo);
1234
1235 if (stat != RPC_SUCCESS) {
1236 NLM_ERR("Failed to contact local NSM - rpc error %d\n", stat);
1237 return;
1238 }
1239 if (smstat.res_stat == stat_fail) {
1240 NLM_ERR("Local NSM refuses to monitor %s\n",
1241 host->nh_caller_name);
1242 mtx_lock(&host->nh_lock);
1243 host->nh_monstate = NLM_MONITOR_FAILED;
1244 mtx_unlock(&host->nh_lock);
1245 return;
1246 }
1247
1248 host->nh_monstate = NLM_MONITORED;
1249 }
1250
1251 /*
1252 * Return an RPC client handle that can be used to talk to the NLM
1253 * running on the given host.
1254 */
1255 CLIENT *
1256 nlm_host_get_rpc(struct nlm_host *host, bool_t isserver)
1257 {
1258 struct nlm_rpc *rpc;
1259 CLIENT *client;
1260
1261 mtx_lock(&host->nh_lock);
1262
1263 if (isserver)
1264 rpc = &host->nh_srvrpc;
1265 else
1266 rpc = &host->nh_clntrpc;
1267
1268 /*
1269 * We can't hold onto RPC handles for too long - the async
1270 * call/reply protocol used by some NLM clients makes it hard
1271 * to tell when they change port numbers (e.g. after a
1272 * reboot). Note that if a client reboots while it isn't
1273 * holding any locks, it won't bother to notify us. We
1274 * expire the RPC handles after two minutes.
1275 */
1276 if (rpc->nr_client && time_uptime > rpc->nr_create_time + 2*60) {
1277 client = rpc->nr_client;
1278 rpc->nr_client = NULL;
1279 mtx_unlock(&host->nh_lock);
1280 CLNT_RELEASE(client);
1281 mtx_lock(&host->nh_lock);
1282 }
1283
1284 if (!rpc->nr_client) {
1285 mtx_unlock(&host->nh_lock);
1286 client = nlm_get_rpc((struct sockaddr *)&host->nh_addr,
1287 NLM_PROG, host->nh_vers);
1288 mtx_lock(&host->nh_lock);
1289
1290 if (client) {
1291 if (rpc->nr_client) {
1292 mtx_unlock(&host->nh_lock);
1293 CLNT_DESTROY(client);
1294 mtx_lock(&host->nh_lock);
1295 } else {
1296 rpc->nr_client = client;
1297 rpc->nr_create_time = time_uptime;
1298 }
1299 }
1300 }
1301
1302 client = rpc->nr_client;
1303 if (client)
1304 CLNT_ACQUIRE(client);
1305 mtx_unlock(&host->nh_lock);
1306
1307 return (client);
1308
1309 }
1310
1311 int nlm_host_get_sysid(struct nlm_host *host)
1312 {
1313
1314 return (host->nh_sysid);
1315 }
1316
1317 int
1318 nlm_host_get_state(struct nlm_host *host)
1319 {
1320
1321 return (host->nh_state);
1322 }
1323
1324 void *
1325 nlm_register_wait_lock(struct nlm4_lock *lock, struct vnode *vp)
1326 {
1327 struct nlm_waiting_lock *nw;
1328
1329 nw = malloc(sizeof(struct nlm_waiting_lock), M_NLM, M_WAITOK);
1330 nw->nw_lock = *lock;
1331 memcpy(&nw->nw_fh.fh_bytes, nw->nw_lock.fh.n_bytes,
1332 nw->nw_lock.fh.n_len);
1333 nw->nw_lock.fh.n_bytes = nw->nw_fh.fh_bytes;
1334 nw->nw_waiting = TRUE;
1335 nw->nw_vp = vp;
1336 mtx_lock(&nlm_global_lock);
1337 TAILQ_INSERT_TAIL(&nlm_waiting_locks, nw, nw_link);
1338 mtx_unlock(&nlm_global_lock);
1339
1340 return nw;
1341 }
1342
1343 void
1344 nlm_deregister_wait_lock(void *handle)
1345 {
1346 struct nlm_waiting_lock *nw = handle;
1347
1348 mtx_lock(&nlm_global_lock);
1349 TAILQ_REMOVE(&nlm_waiting_locks, nw, nw_link);
1350 mtx_unlock(&nlm_global_lock);
1351
1352 free(nw, M_NLM);
1353 }
1354
1355 int
1356 nlm_wait_lock(void *handle, int timo)
1357 {
1358 struct nlm_waiting_lock *nw = handle;
1359 int error;
1360
1361 /*
1362 * If the granted message arrived before we got here,
1363 * nw->nw_waiting will be FALSE - in that case, don't sleep.
1364 */
1365 mtx_lock(&nlm_global_lock);
1366 error = 0;
1367 if (nw->nw_waiting)
1368 error = msleep(nw, &nlm_global_lock, PCATCH, "nlmlock", timo);
1369 TAILQ_REMOVE(&nlm_waiting_locks, nw, nw_link);
1370 if (error) {
1371 /*
1372 * The granted message may arrive after the
1373 * interrupt/timeout but before we manage to lock the
1374 * mutex. Detect this by examining nw_lock.
1375 */
1376 if (!nw->nw_waiting)
1377 error = 0;
1378 } else {
1379 /*
1380 * If nlm_cancel_wait is called, then error will be
1381 * zero but nw_waiting will still be TRUE. We
1382 * translate this into EINTR.
1383 */
1384 if (nw->nw_waiting)
1385 error = EINTR;
1386 }
1387 mtx_unlock(&nlm_global_lock);
1388
1389 free(nw, M_NLM);
1390
1391 return (error);
1392 }
1393
1394 void
1395 nlm_cancel_wait(struct vnode *vp)
1396 {
1397 struct nlm_waiting_lock *nw;
1398
1399 mtx_lock(&nlm_global_lock);
1400 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) {
1401 if (nw->nw_vp == vp) {
1402 wakeup(nw);
1403 }
1404 }
1405 mtx_unlock(&nlm_global_lock);
1406 }
1407
1408
1409 /**********************************************************************/
1410
1411 /*
1412 * Syscall interface with userland.
1413 */
1414
1415 extern void nlm_prog_0(struct svc_req *rqstp, SVCXPRT *transp);
1416 extern void nlm_prog_1(struct svc_req *rqstp, SVCXPRT *transp);
1417 extern void nlm_prog_3(struct svc_req *rqstp, SVCXPRT *transp);
1418 extern void nlm_prog_4(struct svc_req *rqstp, SVCXPRT *transp);
1419
1420 static int
1421 nlm_register_services(SVCPOOL *pool, int addr_count, char **addrs)
1422 {
1423 static rpcvers_t versions[] = {
1424 NLM_SM, NLM_VERS, NLM_VERSX, NLM_VERS4
1425 };
1426 static void (*dispatchers[])(struct svc_req *, SVCXPRT *) = {
1427 nlm_prog_0, nlm_prog_1, nlm_prog_3, nlm_prog_4
1428 };
1429 static const int version_count = sizeof(versions) / sizeof(versions[0]);
1430
1431 SVCXPRT **xprts;
1432 char netid[16];
1433 char uaddr[128];
1434 struct netconfig *nconf;
1435 int i, j, error;
1436
1437 if (!addr_count) {
1438 NLM_ERR("NLM: no service addresses given - can't start server");
1439 return (EINVAL);
1440 }
1441
1442 xprts = malloc(addr_count * sizeof(SVCXPRT *), M_NLM, M_WAITOK|M_ZERO);
1443 for (i = 0; i < version_count; i++) {
1444 for (j = 0; j < addr_count; j++) {
1445 /*
1446 * Create transports for the first version and
1447 * then just register everything else to the
1448 * same transports.
1449 */
1450 if (i == 0) {
1451 char *up;
1452
1453 error = copyin(&addrs[2*j], &up,
1454 sizeof(char*));
1455 if (error)
1456 goto out;
1457 error = copyinstr(up, netid, sizeof(netid),
1458 NULL);
1459 if (error)
1460 goto out;
1461 error = copyin(&addrs[2*j+1], &up,
1462 sizeof(char*));
1463 if (error)
1464 goto out;
1465 error = copyinstr(up, uaddr, sizeof(uaddr),
1466 NULL);
1467 if (error)
1468 goto out;
1469 nconf = getnetconfigent(netid);
1470 if (!nconf) {
1471 NLM_ERR("Can't lookup netid %s\n",
1472 netid);
1473 error = EINVAL;
1474 goto out;
1475 }
1476 xprts[j] = svc_tp_create(pool, dispatchers[i],
1477 NLM_PROG, versions[i], uaddr, nconf);
1478 if (!xprts[j]) {
1479 NLM_ERR("NLM: unable to create "
1480 "(NLM_PROG, %d).\n", versions[i]);
1481 error = EINVAL;
1482 goto out;
1483 }
1484 freenetconfigent(nconf);
1485 } else {
1486 nconf = getnetconfigent(xprts[j]->xp_netid);
1487 rpcb_unset(NLM_PROG, versions[i], nconf);
1488 if (!svc_reg(xprts[j], NLM_PROG, versions[i],
1489 dispatchers[i], nconf)) {
1490 NLM_ERR("NLM: can't register "
1491 "(NLM_PROG, %d)\n", versions[i]);
1492 error = EINVAL;
1493 goto out;
1494 }
1495 }
1496 }
1497 }
1498 error = 0;
1499 out:
1500 for (j = 0; j < addr_count; j++) {
1501 if (xprts[j])
1502 SVC_RELEASE(xprts[j]);
1503 }
1504 free(xprts, M_NLM);
1505 return (error);
1506 }
1507
1508 /*
1509 * Main server entry point. Contacts the local NSM to get its current
1510 * state and send SM_UNMON_ALL. Registers the NLM services and then
1511 * services requests. Does not return until the server is interrupted
1512 * by a signal.
1513 */
1514 static int
1515 nlm_server_main(int addr_count, char **addrs)
1516 {
1517 struct thread *td = curthread;
1518 int error;
1519 SVCPOOL *pool = NULL;
1520 struct sockopt opt;
1521 int portlow;
1522 #ifdef INET6
1523 struct sockaddr_in6 sin6;
1524 #endif
1525 struct sockaddr_in sin;
1526 my_id id;
1527 sm_stat smstat;
1528 struct timeval timo;
1529 enum clnt_stat stat;
1530 struct nlm_host *host, *nhost;
1531 struct nlm_waiting_lock *nw;
1532 vop_advlock_t *old_nfs_advlock;
1533 vop_reclaim_t *old_nfs_reclaim;
1534
1535 if (nlm_is_running != 0) {
1536 NLM_ERR("NLM: can't start server - "
1537 "it appears to be running already\n");
1538 return (EPERM);
1539 }
1540
1541 if (nlm_socket == NULL) {
1542 memset(&opt, 0, sizeof(opt));
1543
1544 error = socreate(AF_INET, &nlm_socket, SOCK_DGRAM, 0,
1545 td->td_ucred, td);
1546 if (error) {
1547 NLM_ERR("NLM: can't create IPv4 socket - error %d\n",
1548 error);
1549 return (error);
1550 }
1551 opt.sopt_dir = SOPT_SET;
1552 opt.sopt_level = IPPROTO_IP;
1553 opt.sopt_name = IP_PORTRANGE;
1554 portlow = IP_PORTRANGE_LOW;
1555 opt.sopt_val = &portlow;
1556 opt.sopt_valsize = sizeof(portlow);
1557 sosetopt(nlm_socket, &opt);
1558
1559 #ifdef INET6
1560 nlm_socket6 = NULL;
1561 error = socreate(AF_INET6, &nlm_socket6, SOCK_DGRAM, 0,
1562 td->td_ucred, td);
1563 if (error) {
1564 NLM_ERR("NLM: can't create IPv6 socket - error %d\n",
1565 error);
1566 soclose(nlm_socket);
1567 nlm_socket = NULL;
1568 return (error);
1569 }
1570 opt.sopt_dir = SOPT_SET;
1571 opt.sopt_level = IPPROTO_IPV6;
1572 opt.sopt_name = IPV6_PORTRANGE;
1573 portlow = IPV6_PORTRANGE_LOW;
1574 opt.sopt_val = &portlow;
1575 opt.sopt_valsize = sizeof(portlow);
1576 sosetopt(nlm_socket6, &opt);
1577 #endif
1578 }
1579
1580 nlm_auth = authunix_create(curthread->td_ucred);
1581
1582 #ifdef INET6
1583 memset(&sin6, 0, sizeof(sin6));
1584 sin6.sin6_len = sizeof(sin6);
1585 sin6.sin6_family = AF_INET6;
1586 sin6.sin6_addr = in6addr_loopback;
1587 nlm_nsm = nlm_get_rpc((struct sockaddr *) &sin6, SM_PROG, SM_VERS);
1588 if (!nlm_nsm) {
1589 #endif
1590 memset(&sin, 0, sizeof(sin));
1591 sin.sin_len = sizeof(sin);
1592 sin.sin_family = AF_INET;
1593 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1594 nlm_nsm = nlm_get_rpc((struct sockaddr *) &sin, SM_PROG,
1595 SM_VERS);
1596 #ifdef INET6
1597 }
1598 #endif
1599
1600 if (!nlm_nsm) {
1601 NLM_ERR("Can't start NLM - unable to contact NSM\n");
1602 error = EINVAL;
1603 goto out;
1604 }
1605
1606 pool = svcpool_create("NLM", NULL);
1607
1608 error = nlm_register_services(pool, addr_count, addrs);
1609 if (error)
1610 goto out;
1611
1612 memset(&id, 0, sizeof(id));
1613 id.my_name = "NFS NLM";
1614
1615 timo.tv_sec = 25;
1616 timo.tv_usec = 0;
1617 stat = CLNT_CALL(nlm_nsm, SM_UNMON_ALL,
1618 (xdrproc_t) xdr_my_id, &id,
1619 (xdrproc_t) xdr_sm_stat, &smstat, timo);
1620
1621 if (stat != RPC_SUCCESS) {
1622 struct rpc_err err;
1623
1624 CLNT_GETERR(nlm_nsm, &err);
1625 NLM_ERR("NLM: unexpected error contacting NSM, "
1626 "stat=%d, errno=%d\n", stat, err.re_errno);
1627 error = EINVAL;
1628 goto out;
1629 }
1630 nlm_is_running = 1;
1631
1632 NLM_DEBUG(1, "NLM: local NSM state is %d\n", smstat.state);
1633 nlm_nsm_state = smstat.state;
1634
1635 old_nfs_advlock = nfs_advlock_p;
1636 nfs_advlock_p = nlm_advlock;
1637 old_nfs_reclaim = nfs_reclaim_p;
1638 nfs_reclaim_p = nlm_reclaim;
1639
1640 svc_run(pool);
1641 error = 0;
1642
1643 nfs_advlock_p = old_nfs_advlock;
1644 nfs_reclaim_p = old_nfs_reclaim;
1645
1646 out:
1647 nlm_is_running = 0;
1648 if (pool)
1649 svcpool_destroy(pool);
1650
1651 /*
1652 * We are finished communicating with the NSM.
1653 */
1654 if (nlm_nsm) {
1655 CLNT_RELEASE(nlm_nsm);
1656 nlm_nsm = NULL;
1657 }
1658
1659 /*
1660 * Trash all the existing state so that if the server
1661 * restarts, it gets a clean slate. This is complicated by the
1662 * possibility that there may be other threads trying to make
1663 * client locking requests.
1664 *
1665 * First we fake a client reboot notification which will
1666 * cancel any pending async locks and purge remote lock state
1667 * from the local lock manager. We release the reference from
1668 * nlm_hosts to the host (which may remove it from the list
1669 * and free it). After this phase, the only entries in the
1670 * nlm_host list should be from other threads performing
1671 * client lock requests.
1672 */
1673 mtx_lock(&nlm_global_lock);
1674 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) {
1675 wakeup(nw);
1676 }
1677 TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, nhost) {
1678 mtx_unlock(&nlm_global_lock);
1679 nlm_host_notify(host, 0);
1680 nlm_host_release(host);
1681 mtx_lock(&nlm_global_lock);
1682 }
1683 mtx_unlock(&nlm_global_lock);
1684
1685 AUTH_DESTROY(nlm_auth);
1686
1687 return (error);
1688 }
1689
1690 int
1691 sys_nlm_syscall(struct thread *td, struct nlm_syscall_args *uap)
1692 {
1693 int error;
1694
1695 #if __FreeBSD_version >= 700000
1696 error = priv_check(td, PRIV_NFS_LOCKD);
1697 #else
1698 error = suser(td);
1699 #endif
1700 if (error)
1701 return (error);
1702
1703 nlm_debug_level = uap->debug_level;
1704 nlm_grace_threshold = time_uptime + uap->grace_period;
1705 nlm_next_idle_check = time_uptime + NLM_IDLE_PERIOD;
1706
1707 return nlm_server_main(uap->addr_count, uap->addrs);
1708 }
1709
1710 /**********************************************************************/
1711
1712 /*
1713 * NLM implementation details, called from the RPC stubs.
1714 */
1715
1716
1717 void
1718 nlm_sm_notify(struct nlm_sm_status *argp)
1719 {
1720 uint32_t sysid;
1721 struct nlm_host *host;
1722
1723 NLM_DEBUG(3, "nlm_sm_notify(): mon_name = %s\n", argp->mon_name);
1724 memcpy(&sysid, &argp->priv, sizeof(sysid));
1725 host = nlm_find_host_by_sysid(sysid);
1726 if (host) {
1727 nlm_host_notify(host, argp->state);
1728 nlm_host_release(host);
1729 }
1730 }
1731
1732 static void
1733 nlm_convert_to_fhandle_t(fhandle_t *fhp, struct netobj *p)
1734 {
1735 memcpy(fhp, p->n_bytes, sizeof(fhandle_t));
1736 }
1737
1738 struct vfs_state {
1739 struct mount *vs_mp;
1740 struct vnode *vs_vp;
1741 int vs_vnlocked;
1742 };
1743
1744 static int
1745 nlm_get_vfs_state(struct nlm_host *host, struct svc_req *rqstp,
1746 fhandle_t *fhp, struct vfs_state *vs, accmode_t accmode)
1747 {
1748 int error, exflags;
1749 struct ucred *cred = NULL, *credanon = NULL;
1750
1751 memset(vs, 0, sizeof(*vs));
1752
1753 vs->vs_mp = vfs_getvfs(&fhp->fh_fsid);
1754 if (!vs->vs_mp) {
1755 return (ESTALE);
1756 }
1757
1758 /* accmode == 0 means don't check, since it is an unlock. */
1759 if (accmode != 0) {
1760 error = VFS_CHECKEXP(vs->vs_mp,
1761 (struct sockaddr *)&host->nh_addr, &exflags, &credanon,
1762 NULL, NULL);
1763 if (error)
1764 goto out;
1765
1766 if (exflags & MNT_EXRDONLY ||
1767 (vs->vs_mp->mnt_flag & MNT_RDONLY)) {
1768 error = EROFS;
1769 goto out;
1770 }
1771 }
1772
1773 error = VFS_FHTOVP(vs->vs_mp, &fhp->fh_fid, LK_EXCLUSIVE, &vs->vs_vp);
1774 if (error)
1775 goto out;
1776 vs->vs_vnlocked = TRUE;
1777
1778 if (accmode != 0) {
1779 if (!svc_getcred(rqstp, &cred, NULL)) {
1780 error = EINVAL;
1781 goto out;
1782 }
1783 if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) {
1784 crfree(cred);
1785 cred = credanon;
1786 credanon = NULL;
1787 }
1788
1789 /*
1790 * Check cred.
1791 */
1792 error = VOP_ACCESS(vs->vs_vp, accmode, cred, curthread);
1793 /*
1794 * If this failed and accmode != VWRITE, try again with
1795 * VWRITE to maintain backwards compatibility with the
1796 * old code that always used VWRITE.
1797 */
1798 if (error != 0 && accmode != VWRITE)
1799 error = VOP_ACCESS(vs->vs_vp, VWRITE, cred, curthread);
1800 if (error)
1801 goto out;
1802 }
1803
1804 #if __FreeBSD_version < 800011
1805 VOP_UNLOCK(vs->vs_vp, 0, curthread);
1806 #else
1807 VOP_UNLOCK(vs->vs_vp, 0);
1808 #endif
1809 vs->vs_vnlocked = FALSE;
1810
1811 out:
1812 if (cred)
1813 crfree(cred);
1814 if (credanon)
1815 crfree(credanon);
1816
1817 return (error);
1818 }
1819
1820 static void
1821 nlm_release_vfs_state(struct vfs_state *vs)
1822 {
1823
1824 if (vs->vs_vp) {
1825 if (vs->vs_vnlocked)
1826 vput(vs->vs_vp);
1827 else
1828 vrele(vs->vs_vp);
1829 }
1830 if (vs->vs_mp)
1831 vfs_rel(vs->vs_mp);
1832 }
1833
1834 static nlm4_stats
1835 nlm_convert_error(int error)
1836 {
1837
1838 if (error == ESTALE)
1839 return nlm4_stale_fh;
1840 else if (error == EROFS)
1841 return nlm4_rofs;
1842 else
1843 return nlm4_failed;
1844 }
1845
1846 int
1847 nlm_do_test(nlm4_testargs *argp, nlm4_testres *result, struct svc_req *rqstp,
1848 CLIENT **rpcp)
1849 {
1850 fhandle_t fh;
1851 struct vfs_state vs;
1852 struct nlm_host *host, *bhost;
1853 int error, sysid;
1854 struct flock fl;
1855 accmode_t accmode;
1856
1857 memset(result, 0, sizeof(*result));
1858 memset(&vs, 0, sizeof(vs));
1859
1860 host = nlm_find_host_by_name(argp->alock.caller_name,
1861 svc_getrpccaller(rqstp), rqstp->rq_vers);
1862 if (!host) {
1863 result->stat.stat = nlm4_denied_nolocks;
1864 return (ENOMEM);
1865 }
1866
1867 NLM_DEBUG(3, "nlm_do_test(): caller_name = %s (sysid = %d)\n",
1868 host->nh_caller_name, host->nh_sysid);
1869
1870 nlm_check_expired_locks(host);
1871 sysid = host->nh_sysid;
1872
1873 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh);
1874 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
1875
1876 if (time_uptime < nlm_grace_threshold) {
1877 result->stat.stat = nlm4_denied_grace_period;
1878 goto out;
1879 }
1880
1881 accmode = argp->exclusive ? VWRITE : VREAD;
1882 error = nlm_get_vfs_state(host, rqstp, &fh, &vs, accmode);
1883 if (error) {
1884 result->stat.stat = nlm_convert_error(error);
1885 goto out;
1886 }
1887
1888 fl.l_start = argp->alock.l_offset;
1889 fl.l_len = argp->alock.l_len;
1890 fl.l_pid = argp->alock.svid;
1891 fl.l_sysid = sysid;
1892 fl.l_whence = SEEK_SET;
1893 if (argp->exclusive)
1894 fl.l_type = F_WRLCK;
1895 else
1896 fl.l_type = F_RDLCK;
1897 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_GETLK, &fl, F_REMOTE);
1898 if (error) {
1899 result->stat.stat = nlm4_failed;
1900 goto out;
1901 }
1902
1903 if (fl.l_type == F_UNLCK) {
1904 result->stat.stat = nlm4_granted;
1905 } else {
1906 result->stat.stat = nlm4_denied;
1907 result->stat.nlm4_testrply_u.holder.exclusive =
1908 (fl.l_type == F_WRLCK);
1909 result->stat.nlm4_testrply_u.holder.svid = fl.l_pid;
1910 bhost = nlm_find_host_by_sysid(fl.l_sysid);
1911 if (bhost) {
1912 /*
1913 * We don't have any useful way of recording
1914 * the value of oh used in the original lock
1915 * request. Ideally, the test reply would have
1916 * a space for the owning host's name allowing
1917 * our caller's NLM to keep track.
1918 *
1919 * As far as I can see, Solaris uses an eight
1920 * byte structure for oh which contains a four
1921 * byte pid encoded in local byte order and
1922 * the first four bytes of the host
1923 * name. Linux uses a variable length string
1924 * 'pid@hostname' in ascii but doesn't even
1925 * return that in test replies.
1926 *
1927 * For the moment, return nothing in oh
1928 * (already zero'ed above).
1929 */
1930 nlm_host_release(bhost);
1931 }
1932 result->stat.nlm4_testrply_u.holder.l_offset = fl.l_start;
1933 result->stat.nlm4_testrply_u.holder.l_len = fl.l_len;
1934 }
1935
1936 out:
1937 nlm_release_vfs_state(&vs);
1938 if (rpcp)
1939 *rpcp = nlm_host_get_rpc(host, TRUE);
1940 nlm_host_release(host);
1941 return (0);
1942 }
1943
1944 int
1945 nlm_do_lock(nlm4_lockargs *argp, nlm4_res *result, struct svc_req *rqstp,
1946 bool_t monitor, CLIENT **rpcp)
1947 {
1948 fhandle_t fh;
1949 struct vfs_state vs;
1950 struct nlm_host *host;
1951 int error, sysid;
1952 struct flock fl;
1953 accmode_t accmode;
1954
1955 memset(result, 0, sizeof(*result));
1956 memset(&vs, 0, sizeof(vs));
1957
1958 host = nlm_find_host_by_name(argp->alock.caller_name,
1959 svc_getrpccaller(rqstp), rqstp->rq_vers);
1960 if (!host) {
1961 result->stat.stat = nlm4_denied_nolocks;
1962 return (ENOMEM);
1963 }
1964
1965 NLM_DEBUG(3, "nlm_do_lock(): caller_name = %s (sysid = %d)\n",
1966 host->nh_caller_name, host->nh_sysid);
1967
1968 if (monitor && host->nh_state && argp->state
1969 && host->nh_state != argp->state) {
1970 /*
1971 * The host rebooted without telling us. Trash its
1972 * locks.
1973 */
1974 nlm_host_notify(host, argp->state);
1975 }
1976
1977 nlm_check_expired_locks(host);
1978 sysid = host->nh_sysid;
1979
1980 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh);
1981 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
1982
1983 if (time_uptime < nlm_grace_threshold && !argp->reclaim) {
1984 result->stat.stat = nlm4_denied_grace_period;
1985 goto out;
1986 }
1987
1988 accmode = argp->exclusive ? VWRITE : VREAD;
1989 error = nlm_get_vfs_state(host, rqstp, &fh, &vs, accmode);
1990 if (error) {
1991 result->stat.stat = nlm_convert_error(error);
1992 goto out;
1993 }
1994
1995 fl.l_start = argp->alock.l_offset;
1996 fl.l_len = argp->alock.l_len;
1997 fl.l_pid = argp->alock.svid;
1998 fl.l_sysid = sysid;
1999 fl.l_whence = SEEK_SET;
2000 if (argp->exclusive)
2001 fl.l_type = F_WRLCK;
2002 else
2003 fl.l_type = F_RDLCK;
2004 if (argp->block) {
2005 struct nlm_async_lock *af;
2006 CLIENT *client;
2007 struct nlm_grantcookie cookie;
2008
2009 /*
2010 * First, make sure we can contact the host's NLM.
2011 */
2012 client = nlm_host_get_rpc(host, TRUE);
2013 if (!client) {
2014 result->stat.stat = nlm4_failed;
2015 goto out;
2016 }
2017
2018 /*
2019 * First we need to check and see if there is an
2020 * existing blocked lock that matches. This could be a
2021 * badly behaved client or an RPC re-send. If we find
2022 * one, just return nlm4_blocked.
2023 */
2024 mtx_lock(&host->nh_lock);
2025 TAILQ_FOREACH(af, &host->nh_pending, af_link) {
2026 if (af->af_fl.l_start == fl.l_start
2027 && af->af_fl.l_len == fl.l_len
2028 && af->af_fl.l_pid == fl.l_pid
2029 && af->af_fl.l_type == fl.l_type) {
2030 break;
2031 }
2032 }
2033 if (!af) {
2034 cookie.ng_sysid = host->nh_sysid;
2035 cookie.ng_cookie = host->nh_grantcookie++;
2036 }
2037 mtx_unlock(&host->nh_lock);
2038 if (af) {
2039 CLNT_RELEASE(client);
2040 result->stat.stat = nlm4_blocked;
2041 goto out;
2042 }
2043
2044 af = malloc(sizeof(struct nlm_async_lock), M_NLM,
2045 M_WAITOK|M_ZERO);
2046 TASK_INIT(&af->af_task, 0, nlm_lock_callback, af);
2047 af->af_vp = vs.vs_vp;
2048 af->af_fl = fl;
2049 af->af_host = host;
2050 af->af_rpc = client;
2051 /*
2052 * We use M_RPC here so that we can xdr_free the thing
2053 * later.
2054 */
2055 nlm_make_netobj(&af->af_granted.cookie,
2056 (caddr_t)&cookie, sizeof(cookie), M_RPC);
2057 af->af_granted.exclusive = argp->exclusive;
2058 af->af_granted.alock.caller_name =
2059 strdup(argp->alock.caller_name, M_RPC);
2060 nlm_copy_netobj(&af->af_granted.alock.fh,
2061 &argp->alock.fh, M_RPC);
2062 nlm_copy_netobj(&af->af_granted.alock.oh,
2063 &argp->alock.oh, M_RPC);
2064 af->af_granted.alock.svid = argp->alock.svid;
2065 af->af_granted.alock.l_offset = argp->alock.l_offset;
2066 af->af_granted.alock.l_len = argp->alock.l_len;
2067
2068 /*
2069 * Put the entry on the pending list before calling
2070 * VOP_ADVLOCKASYNC. We do this in case the lock
2071 * request was blocked (returning EINPROGRESS) but
2072 * then granted before we manage to run again. The
2073 * client may receive the granted message before we
2074 * send our blocked reply but thats their problem.
2075 */
2076 mtx_lock(&host->nh_lock);
2077 TAILQ_INSERT_TAIL(&host->nh_pending, af, af_link);
2078 mtx_unlock(&host->nh_lock);
2079
2080 error = VOP_ADVLOCKASYNC(vs.vs_vp, NULL, F_SETLK, &fl, F_REMOTE,
2081 &af->af_task, &af->af_cookie);
2082
2083 /*
2084 * If the lock completed synchronously, just free the
2085 * tracking structure now.
2086 */
2087 if (error != EINPROGRESS) {
2088 CLNT_RELEASE(af->af_rpc);
2089 mtx_lock(&host->nh_lock);
2090 TAILQ_REMOVE(&host->nh_pending, af, af_link);
2091 mtx_unlock(&host->nh_lock);
2092 xdr_free((xdrproc_t) xdr_nlm4_testargs,
2093 &af->af_granted);
2094 free(af, M_NLM);
2095 } else {
2096 NLM_DEBUG(2, "NLM: pending async lock %p for %s "
2097 "(sysid %d)\n", af, host->nh_caller_name, sysid);
2098 /*
2099 * Don't vrele the vnode just yet - this must
2100 * wait until either the async callback
2101 * happens or the lock is cancelled.
2102 */
2103 vs.vs_vp = NULL;
2104 }
2105 } else {
2106 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_SETLK, &fl, F_REMOTE);
2107 }
2108
2109 if (error) {
2110 if (error == EINPROGRESS) {
2111 result->stat.stat = nlm4_blocked;
2112 } else if (error == EDEADLK) {
2113 result->stat.stat = nlm4_deadlck;
2114 } else if (error == EAGAIN) {
2115 result->stat.stat = nlm4_denied;
2116 } else {
2117 result->stat.stat = nlm4_failed;
2118 }
2119 } else {
2120 if (monitor)
2121 nlm_host_monitor(host, argp->state);
2122 result->stat.stat = nlm4_granted;
2123 }
2124
2125 out:
2126 nlm_release_vfs_state(&vs);
2127 if (rpcp)
2128 *rpcp = nlm_host_get_rpc(host, TRUE);
2129 nlm_host_release(host);
2130 return (0);
2131 }
2132
2133 int
2134 nlm_do_cancel(nlm4_cancargs *argp, nlm4_res *result, struct svc_req *rqstp,
2135 CLIENT **rpcp)
2136 {
2137 fhandle_t fh;
2138 struct vfs_state vs;
2139 struct nlm_host *host;
2140 int error, sysid;
2141 struct flock fl;
2142 struct nlm_async_lock *af;
2143
2144 memset(result, 0, sizeof(*result));
2145 memset(&vs, 0, sizeof(vs));
2146
2147 host = nlm_find_host_by_name(argp->alock.caller_name,
2148 svc_getrpccaller(rqstp), rqstp->rq_vers);
2149 if (!host) {
2150 result->stat.stat = nlm4_denied_nolocks;
2151 return (ENOMEM);
2152 }
2153
2154 NLM_DEBUG(3, "nlm_do_cancel(): caller_name = %s (sysid = %d)\n",
2155 host->nh_caller_name, host->nh_sysid);
2156
2157 nlm_check_expired_locks(host);
2158 sysid = host->nh_sysid;
2159
2160 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh);
2161 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
2162
2163 if (time_uptime < nlm_grace_threshold) {
2164 result->stat.stat = nlm4_denied_grace_period;
2165 goto out;
2166 }
2167
2168 error = nlm_get_vfs_state(host, rqstp, &fh, &vs, (accmode_t)0);
2169 if (error) {
2170 result->stat.stat = nlm_convert_error(error);
2171 goto out;
2172 }
2173
2174 fl.l_start = argp->alock.l_offset;
2175 fl.l_len = argp->alock.l_len;
2176 fl.l_pid = argp->alock.svid;
2177 fl.l_sysid = sysid;
2178 fl.l_whence = SEEK_SET;
2179 if (argp->exclusive)
2180 fl.l_type = F_WRLCK;
2181 else
2182 fl.l_type = F_RDLCK;
2183
2184 /*
2185 * First we need to try and find the async lock request - if
2186 * there isn't one, we give up and return nlm4_denied.
2187 */
2188 mtx_lock(&host->nh_lock);
2189
2190 TAILQ_FOREACH(af, &host->nh_pending, af_link) {
2191 if (af->af_fl.l_start == fl.l_start
2192 && af->af_fl.l_len == fl.l_len
2193 && af->af_fl.l_pid == fl.l_pid
2194 && af->af_fl.l_type == fl.l_type) {
2195 break;
2196 }
2197 }
2198
2199 if (!af) {
2200 mtx_unlock(&host->nh_lock);
2201 result->stat.stat = nlm4_denied;
2202 goto out;
2203 }
2204
2205 error = nlm_cancel_async_lock(af);
2206
2207 if (error) {
2208 result->stat.stat = nlm4_denied;
2209 } else {
2210 result->stat.stat = nlm4_granted;
2211 }
2212
2213 mtx_unlock(&host->nh_lock);
2214
2215 out:
2216 nlm_release_vfs_state(&vs);
2217 if (rpcp)
2218 *rpcp = nlm_host_get_rpc(host, TRUE);
2219 nlm_host_release(host);
2220 return (0);
2221 }
2222
2223 int
2224 nlm_do_unlock(nlm4_unlockargs *argp, nlm4_res *result, struct svc_req *rqstp,
2225 CLIENT **rpcp)
2226 {
2227 fhandle_t fh;
2228 struct vfs_state vs;
2229 struct nlm_host *host;
2230 int error, sysid;
2231 struct flock fl;
2232
2233 memset(result, 0, sizeof(*result));
2234 memset(&vs, 0, sizeof(vs));
2235
2236 host = nlm_find_host_by_name(argp->alock.caller_name,
2237 svc_getrpccaller(rqstp), rqstp->rq_vers);
2238 if (!host) {
2239 result->stat.stat = nlm4_denied_nolocks;
2240 return (ENOMEM);
2241 }
2242
2243 NLM_DEBUG(3, "nlm_do_unlock(): caller_name = %s (sysid = %d)\n",
2244 host->nh_caller_name, host->nh_sysid);
2245
2246 nlm_check_expired_locks(host);
2247 sysid = host->nh_sysid;
2248
2249 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh);
2250 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
2251
2252 if (time_uptime < nlm_grace_threshold) {
2253 result->stat.stat = nlm4_denied_grace_period;
2254 goto out;
2255 }
2256
2257 error = nlm_get_vfs_state(host, rqstp, &fh, &vs, (accmode_t)0);
2258 if (error) {
2259 result->stat.stat = nlm_convert_error(error);
2260 goto out;
2261 }
2262
2263 fl.l_start = argp->alock.l_offset;
2264 fl.l_len = argp->alock.l_len;
2265 fl.l_pid = argp->alock.svid;
2266 fl.l_sysid = sysid;
2267 fl.l_whence = SEEK_SET;
2268 fl.l_type = F_UNLCK;
2269 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_UNLCK, &fl, F_REMOTE);
2270
2271 /*
2272 * Ignore the error - there is no result code for failure,
2273 * only for grace period.
2274 */
2275 result->stat.stat = nlm4_granted;
2276
2277 out:
2278 nlm_release_vfs_state(&vs);
2279 if (rpcp)
2280 *rpcp = nlm_host_get_rpc(host, TRUE);
2281 nlm_host_release(host);
2282 return (0);
2283 }
2284
2285 int
2286 nlm_do_granted(nlm4_testargs *argp, nlm4_res *result, struct svc_req *rqstp,
2287
2288 CLIENT **rpcp)
2289 {
2290 struct nlm_host *host;
2291 struct nlm_waiting_lock *nw;
2292
2293 memset(result, 0, sizeof(*result));
2294
2295 host = nlm_find_host_by_addr(svc_getrpccaller(rqstp), rqstp->rq_vers);
2296 if (!host) {
2297 result->stat.stat = nlm4_denied_nolocks;
2298 return (ENOMEM);
2299 }
2300
2301 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC);
2302 result->stat.stat = nlm4_denied;
2303 KFAIL_POINT_CODE(DEBUG_FP, nlm_deny_grant, goto out);
2304
2305 mtx_lock(&nlm_global_lock);
2306 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) {
2307 if (!nw->nw_waiting)
2308 continue;
2309 if (argp->alock.svid == nw->nw_lock.svid
2310 && argp->alock.l_offset == nw->nw_lock.l_offset
2311 && argp->alock.l_len == nw->nw_lock.l_len
2312 && argp->alock.fh.n_len == nw->nw_lock.fh.n_len
2313 && !memcmp(argp->alock.fh.n_bytes, nw->nw_lock.fh.n_bytes,
2314 nw->nw_lock.fh.n_len)) {
2315 nw->nw_waiting = FALSE;
2316 wakeup(nw);
2317 result->stat.stat = nlm4_granted;
2318 break;
2319 }
2320 }
2321 mtx_unlock(&nlm_global_lock);
2322
2323 out:
2324 if (rpcp)
2325 *rpcp = nlm_host_get_rpc(host, TRUE);
2326 nlm_host_release(host);
2327 return (0);
2328 }
2329
2330 void
2331 nlm_do_granted_res(nlm4_res *argp, struct svc_req *rqstp)
2332 {
2333 struct nlm_host *host = NULL;
2334 struct nlm_async_lock *af = NULL;
2335 int error;
2336
2337 if (argp->cookie.n_len != sizeof(struct nlm_grantcookie)) {
2338 NLM_DEBUG(1, "NLM: bogus grant cookie");
2339 goto out;
2340 }
2341
2342 host = nlm_find_host_by_sysid(ng_sysid(&argp->cookie));
2343 if (!host) {
2344 NLM_DEBUG(1, "NLM: Unknown host rejected our grant");
2345 goto out;
2346 }
2347
2348 mtx_lock(&host->nh_lock);
2349 TAILQ_FOREACH(af, &host->nh_granted, af_link)
2350 if (ng_cookie(&argp->cookie) ==
2351 ng_cookie(&af->af_granted.cookie))
2352 break;
2353 if (af)
2354 TAILQ_REMOVE(&host->nh_granted, af, af_link);
2355 mtx_unlock(&host->nh_lock);
2356
2357 if (!af) {
2358 NLM_DEBUG(1, "NLM: host %s (sysid %d) replied to our grant "
2359 "with unrecognized cookie %d:%d", host->nh_caller_name,
2360 host->nh_sysid, ng_sysid(&argp->cookie),
2361 ng_cookie(&argp->cookie));
2362 goto out;
2363 }
2364
2365 if (argp->stat.stat != nlm4_granted) {
2366 af->af_fl.l_type = F_UNLCK;
2367 error = VOP_ADVLOCK(af->af_vp, NULL, F_UNLCK, &af->af_fl, F_REMOTE);
2368 if (error) {
2369 NLM_DEBUG(1, "NLM: host %s (sysid %d) rejected our grant "
2370 "and we failed to unlock (%d)", host->nh_caller_name,
2371 host->nh_sysid, error);
2372 goto out;
2373 }
2374
2375 NLM_DEBUG(5, "NLM: async lock %p rejected by host %s (sysid %d)",
2376 af, host->nh_caller_name, host->nh_sysid);
2377 } else {
2378 NLM_DEBUG(5, "NLM: async lock %p accepted by host %s (sysid %d)",
2379 af, host->nh_caller_name, host->nh_sysid);
2380 }
2381
2382 out:
2383 if (af)
2384 nlm_free_async_lock(af);
2385 if (host)
2386 nlm_host_release(host);
2387 }
2388
2389 void
2390 nlm_do_free_all(nlm4_notify *argp)
2391 {
2392 struct nlm_host *host, *thost;
2393
2394 TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, thost) {
2395 if (!strcmp(host->nh_caller_name, argp->name))
2396 nlm_host_notify(host, argp->state);
2397 }
2398 }
2399
2400 /*
2401 * Kernel module glue
2402 */
2403 static int
2404 nfslockd_modevent(module_t mod, int type, void *data)
2405 {
2406
2407 switch (type) {
2408 case MOD_LOAD:
2409 return (0);
2410 case MOD_UNLOAD:
2411 /* The NLM module cannot be safely unloaded. */
2412 /* FALLTHROUGH */
2413 default:
2414 return (EOPNOTSUPP);
2415 }
2416 }
2417 static moduledata_t nfslockd_mod = {
2418 "nfslockd",
2419 nfslockd_modevent,
2420 NULL,
2421 };
2422 DECLARE_MODULE(nfslockd, nfslockd_mod, SI_SUB_VFS, SI_ORDER_ANY);
2423
2424 /* So that loader and kldload(2) can find us, wherever we are.. */
2425 MODULE_DEPEND(nfslockd, krpc, 1, 1, 1);
2426 MODULE_DEPEND(nfslockd, nfslock, 1, 1, 1);
2427 MODULE_VERSION(nfslockd, 1);
Cache object: 78a4a510d066a3734157777d36d111a2
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