Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/lockd/host.c | |
4 | * | |
5 | * Management for NLM peer hosts. The nlm_host struct is shared | |
6 | * between client and server implementation. The only reason to | |
7 | * do so is to reduce code bloat. | |
8 | * | |
9 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> | |
10 | */ | |
11 | ||
12 | #include <linux/types.h> | |
1da177e4 LT |
13 | #include <linux/slab.h> |
14 | #include <linux/in.h> | |
1b333c54 | 15 | #include <linux/in6.h> |
1da177e4 | 16 | #include <linux/sunrpc/clnt.h> |
5976687a | 17 | #include <linux/sunrpc/addr.h> |
1da177e4 LT |
18 | #include <linux/sunrpc/svc.h> |
19 | #include <linux/lockd/lockd.h> | |
353ab6e9 | 20 | #include <linux/mutex.h> |
1da177e4 | 21 | |
66697bfd SK |
22 | #include <linux/sunrpc/svc_xprt.h> |
23 | ||
1b333c54 | 24 | #include <net/ipv6.h> |
1da177e4 | 25 | |
3cf7fb07 SK |
26 | #include "netns.h" |
27 | ||
1da177e4 | 28 | #define NLMDBG_FACILITY NLMDBG_HOSTCACHE |
1da177e4 | 29 | #define NLM_HOST_NRHASH 32 |
1da177e4 | 30 | #define NLM_HOST_REBIND (60 * HZ) |
1447d25e N |
31 | #define NLM_HOST_EXPIRE (300 * HZ) |
32 | #define NLM_HOST_COLLECT (120 * HZ) | |
1da177e4 | 33 | |
d2df0484 | 34 | static struct hlist_head nlm_server_hosts[NLM_HOST_NRHASH]; |
8ea6ecc8 | 35 | static struct hlist_head nlm_client_hosts[NLM_HOST_NRHASH]; |
b1137468 | 36 | |
b67bfe0d | 37 | #define for_each_host(host, chain, table) \ |
b1137468 BF |
38 | for ((chain) = (table); \ |
39 | (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ | |
b67bfe0d | 40 | hlist_for_each_entry((host), (chain), h_hash) |
b1137468 | 41 | |
b67bfe0d | 42 | #define for_each_host_safe(host, next, chain, table) \ |
b1137468 BF |
43 | for ((chain) = (table); \ |
44 | (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ | |
b67bfe0d | 45 | hlist_for_each_entry_safe((host), (next), \ |
b1137468 BF |
46 | (chain), h_hash) |
47 | ||
fcc072c7 | 48 | static unsigned long nrhosts; |
353ab6e9 | 49 | static DEFINE_MUTEX(nlm_host_mutex); |
1da177e4 | 50 | |
27adaddc | 51 | static void nlm_gc_hosts(struct net *net); |
1da177e4 | 52 | |
7f1ed18b CL |
53 | struct nlm_lookup_host_info { |
54 | const int server; /* search for server|client */ | |
88541c84 CL |
55 | const struct sockaddr *sap; /* address to search for */ |
56 | const size_t salen; /* it's length */ | |
7f1ed18b CL |
57 | const unsigned short protocol; /* transport to search for*/ |
58 | const u32 version; /* NLM version to search for */ | |
59 | const char *hostname; /* remote's hostname */ | |
60 | const size_t hostname_len; /* it's length */ | |
0cb2659b | 61 | const int noresvport; /* use non-priv port */ |
66697bfd | 62 | struct net *net; /* network namespace to bind */ |
b422df91 | 63 | const struct cred *cred; |
7f1ed18b CL |
64 | }; |
65 | ||
ede2fea0 CL |
66 | /* |
67 | * Hash function must work well on big- and little-endian platforms | |
68 | */ | |
69 | static unsigned int __nlm_hash32(const __be32 n) | |
70 | { | |
71 | unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16); | |
72 | return hash ^ (hash >> 8); | |
73 | } | |
74 | ||
75 | static unsigned int __nlm_hash_addr4(const struct sockaddr *sap) | |
76 | { | |
77 | const struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
78 | return __nlm_hash32(sin->sin_addr.s_addr); | |
79 | } | |
80 | ||
81 | static unsigned int __nlm_hash_addr6(const struct sockaddr *sap) | |
82 | { | |
83 | const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
84 | const struct in6_addr addr = sin6->sin6_addr; | |
85 | return __nlm_hash32(addr.s6_addr32[0]) ^ | |
86 | __nlm_hash32(addr.s6_addr32[1]) ^ | |
87 | __nlm_hash32(addr.s6_addr32[2]) ^ | |
88 | __nlm_hash32(addr.s6_addr32[3]); | |
89 | } | |
90 | ||
91 | static unsigned int nlm_hash_address(const struct sockaddr *sap) | |
92 | { | |
93 | unsigned int hash; | |
94 | ||
95 | switch (sap->sa_family) { | |
96 | case AF_INET: | |
97 | hash = __nlm_hash_addr4(sap); | |
98 | break; | |
99 | case AF_INET6: | |
100 | hash = __nlm_hash_addr6(sap); | |
101 | break; | |
102 | default: | |
103 | hash = 0; | |
104 | } | |
105 | return hash & (NLM_HOST_NRHASH - 1); | |
106 | } | |
107 | ||
a7952f40 CL |
108 | /* |
109 | * Allocate and initialize an nlm_host. Common to both client and server. | |
110 | */ | |
111 | static struct nlm_host *nlm_alloc_host(struct nlm_lookup_host_info *ni, | |
112 | struct nsm_handle *nsm) | |
113 | { | |
114 | struct nlm_host *host = NULL; | |
115 | unsigned long now = jiffies; | |
116 | ||
117 | if (nsm != NULL) | |
c751082c | 118 | refcount_inc(&nsm->sm_count); |
a7952f40 CL |
119 | else { |
120 | host = NULL; | |
0ad95472 | 121 | nsm = nsm_get_handle(ni->net, ni->sap, ni->salen, |
a7952f40 CL |
122 | ni->hostname, ni->hostname_len); |
123 | if (unlikely(nsm == NULL)) { | |
124 | dprintk("lockd: %s failed; no nsm handle\n", | |
125 | __func__); | |
126 | goto out; | |
127 | } | |
128 | } | |
129 | ||
130 | host = kmalloc(sizeof(*host), GFP_KERNEL); | |
131 | if (unlikely(host == NULL)) { | |
132 | dprintk("lockd: %s failed; no memory\n", __func__); | |
133 | nsm_release(nsm); | |
134 | goto out; | |
135 | } | |
136 | ||
137 | memcpy(nlm_addr(host), ni->sap, ni->salen); | |
138 | host->h_addrlen = ni->salen; | |
139 | rpc_set_port(nlm_addr(host), 0); | |
140 | host->h_srcaddrlen = 0; | |
141 | ||
142 | host->h_rpcclnt = NULL; | |
143 | host->h_name = nsm->sm_name; | |
144 | host->h_version = ni->version; | |
145 | host->h_proto = ni->protocol; | |
146 | host->h_reclaiming = 0; | |
147 | host->h_server = ni->server; | |
148 | host->h_noresvport = ni->noresvport; | |
149 | host->h_inuse = 0; | |
150 | init_waitqueue_head(&host->h_gracewait); | |
151 | init_rwsem(&host->h_rwsem); | |
152 | host->h_state = 0; | |
153 | host->h_nsmstate = 0; | |
154 | host->h_pidcount = 0; | |
fee21fb5 | 155 | refcount_set(&host->h_count, 1); |
a7952f40 CL |
156 | mutex_init(&host->h_mutex); |
157 | host->h_nextrebind = now + NLM_HOST_REBIND; | |
158 | host->h_expires = now + NLM_HOST_EXPIRE; | |
159 | INIT_LIST_HEAD(&host->h_lockowners); | |
160 | spin_lock_init(&host->h_lock); | |
161 | INIT_LIST_HEAD(&host->h_granted); | |
162 | INIT_LIST_HEAD(&host->h_reclaim); | |
163 | host->h_nsmhandle = nsm; | |
164 | host->h_addrbuf = nsm->sm_addrbuf; | |
66697bfd | 165 | host->net = ni->net; |
3316fb80 | 166 | host->h_cred = get_cred(ni->cred); |
97f8e625 | 167 | strscpy(host->nodename, utsname()->nodename, sizeof(host->nodename)); |
a7952f40 CL |
168 | |
169 | out: | |
170 | return host; | |
171 | } | |
172 | ||
c53c1bb9 | 173 | /* |
723bb5b5 CL |
174 | * Destroy an nlm_host and free associated resources |
175 | * | |
176 | * Caller must hold nlm_host_mutex. | |
c53c1bb9 | 177 | */ |
723bb5b5 | 178 | static void nlm_destroy_host_locked(struct nlm_host *host) |
c53c1bb9 OK |
179 | { |
180 | struct rpc_clnt *clnt; | |
caa4e76b | 181 | struct lockd_net *ln = net_generic(host->net, lockd_net_id); |
c53c1bb9 | 182 | |
723bb5b5 CL |
183 | dprintk("lockd: destroy host %s\n", host->h_name); |
184 | ||
723bb5b5 CL |
185 | hlist_del_init(&host->h_hash); |
186 | ||
c53c1bb9 | 187 | nsm_unmonitor(host); |
c8c23c42 | 188 | nsm_release(host->h_nsmhandle); |
c53c1bb9 | 189 | |
34f52e35 TM |
190 | clnt = host->h_rpcclnt; |
191 | if (clnt != NULL) | |
192 | rpc_shutdown_client(clnt); | |
b422df91 | 193 | put_cred(host->h_cred); |
c53c1bb9 | 194 | kfree(host); |
723bb5b5 | 195 | |
caa4e76b | 196 | ln->nrhosts--; |
723bb5b5 | 197 | nrhosts--; |
c53c1bb9 OK |
198 | } |
199 | ||
d7d20440 CL |
200 | /** |
201 | * nlmclnt_lookup_host - Find an NLM host handle matching a remote server | |
202 | * @sap: network address of server | |
203 | * @salen: length of server address | |
204 | * @protocol: transport protocol to use | |
205 | * @version: NLM protocol version | |
206 | * @hostname: '\0'-terminated hostname of server | |
0cb2659b | 207 | * @noresvport: 1 if non-privileged port should be used |
b422df91 TM |
208 | * @net: pointer to net namespace |
209 | * @cred: pointer to cred | |
d7d20440 CL |
210 | * |
211 | * Returns an nlm_host structure that matches the passed-in | |
212 | * [server address, transport protocol, NLM version, server hostname]. | |
213 | * If one doesn't already exist in the host cache, a new handle is | |
214 | * created and returned. | |
c585646d | 215 | */ |
d7d20440 CL |
216 | struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, |
217 | const size_t salen, | |
218 | const unsigned short protocol, | |
0cb2659b CL |
219 | const u32 version, |
220 | const char *hostname, | |
66697bfd | 221 | int noresvport, |
b422df91 TM |
222 | struct net *net, |
223 | const struct cred *cred) | |
c585646d | 224 | { |
7f1ed18b CL |
225 | struct nlm_lookup_host_info ni = { |
226 | .server = 0, | |
d7d20440 CL |
227 | .sap = sap, |
228 | .salen = salen, | |
229 | .protocol = protocol, | |
7f1ed18b CL |
230 | .version = version, |
231 | .hostname = hostname, | |
d7d20440 | 232 | .hostname_len = strlen(hostname), |
0cb2659b | 233 | .noresvport = noresvport, |
66697bfd | 234 | .net = net, |
b422df91 | 235 | .cred = cred, |
7f1ed18b | 236 | }; |
8ea6ecc8 | 237 | struct hlist_head *chain; |
8ea6ecc8 CL |
238 | struct nlm_host *host; |
239 | struct nsm_handle *nsm = NULL; | |
caa4e76b | 240 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
c98451bd | 241 | |
7f1ed18b CL |
242 | dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, |
243 | (hostname ? hostname : "<none>"), version, | |
d7d20440 | 244 | (protocol == IPPROTO_UDP ? "udp" : "tcp")); |
7f1ed18b | 245 | |
8ea6ecc8 CL |
246 | mutex_lock(&nlm_host_mutex); |
247 | ||
248 | chain = &nlm_client_hosts[nlm_hash_address(sap)]; | |
b67bfe0d | 249 | hlist_for_each_entry(host, chain, h_hash) { |
66697bfd SK |
250 | if (host->net != net) |
251 | continue; | |
8ea6ecc8 CL |
252 | if (!rpc_cmp_addr(nlm_addr(host), sap)) |
253 | continue; | |
254 | ||
255 | /* Same address. Share an NSM handle if we already have one */ | |
256 | if (nsm == NULL) | |
257 | nsm = host->h_nsmhandle; | |
258 | ||
259 | if (host->h_proto != protocol) | |
260 | continue; | |
261 | if (host->h_version != version) | |
262 | continue; | |
263 | ||
264 | nlm_get_host(host); | |
265 | dprintk("lockd: %s found host %s (%s)\n", __func__, | |
266 | host->h_name, host->h_addrbuf); | |
267 | goto out; | |
268 | } | |
269 | ||
270 | host = nlm_alloc_host(&ni, nsm); | |
271 | if (unlikely(host == NULL)) | |
272 | goto out; | |
273 | ||
274 | hlist_add_head(&host->h_hash, chain); | |
caa4e76b | 275 | ln->nrhosts++; |
8ea6ecc8 CL |
276 | nrhosts++; |
277 | ||
278 | dprintk("lockd: %s created host %s (%s)\n", __func__, | |
279 | host->h_name, host->h_addrbuf); | |
280 | ||
281 | out: | |
282 | mutex_unlock(&nlm_host_mutex); | |
283 | return host; | |
284 | } | |
285 | ||
286 | /** | |
287 | * nlmclnt_release_host - release client nlm_host | |
288 | * @host: nlm_host to release | |
289 | * | |
290 | */ | |
291 | void nlmclnt_release_host(struct nlm_host *host) | |
292 | { | |
293 | if (host == NULL) | |
294 | return; | |
295 | ||
296 | dprintk("lockd: release client host %s\n", host->h_name); | |
297 | ||
a2d30a54 | 298 | WARN_ON_ONCE(host->h_server); |
8ea6ecc8 | 299 | |
4a9be28c | 300 | if (refcount_dec_and_mutex_lock(&host->h_count, &nlm_host_mutex)) { |
a2d30a54 TM |
301 | WARN_ON_ONCE(!list_empty(&host->h_lockowners)); |
302 | WARN_ON_ONCE(!list_empty(&host->h_granted)); | |
303 | WARN_ON_ONCE(!list_empty(&host->h_reclaim)); | |
8ea6ecc8 | 304 | |
8ea6ecc8 CL |
305 | nlm_destroy_host_locked(host); |
306 | mutex_unlock(&nlm_host_mutex); | |
307 | } | |
c585646d AB |
308 | } |
309 | ||
6bfbe8af CL |
310 | /** |
311 | * nlmsvc_lookup_host - Find an NLM host handle matching a remote client | |
312 | * @rqstp: incoming NLM request | |
313 | * @hostname: name of client host | |
314 | * @hostname_len: length of client hostname | |
315 | * | |
316 | * Returns an nlm_host structure that matches the [client address, | |
317 | * transport protocol, NLM version, client hostname] of the passed-in | |
318 | * NLM request. If one doesn't already exist in the host cache, a | |
319 | * new handle is created and returned. | |
320 | * | |
321 | * Before possibly creating a new nlm_host, construct a sockaddr | |
322 | * for a specific source address in case the local system has | |
323 | * multiple network addresses. The family of the address in | |
324 | * rq_daddr is guaranteed to be the same as the family of the | |
325 | * address in rq_addr, so it's safe to use the same family for | |
326 | * the source address. | |
c585646d | 327 | */ |
6bfbe8af CL |
328 | struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp, |
329 | const char *hostname, | |
330 | const size_t hostname_len) | |
c585646d | 331 | { |
67216b94 | 332 | struct hlist_head *chain; |
67216b94 CL |
333 | struct nlm_host *host = NULL; |
334 | struct nsm_handle *nsm = NULL; | |
849a1cf1 MJ |
335 | struct sockaddr *src_sap = svc_daddr(rqstp); |
336 | size_t src_len = rqstp->rq_daddrlen; | |
9695c705 | 337 | struct net *net = SVC_NET(rqstp); |
7f1ed18b CL |
338 | struct nlm_lookup_host_info ni = { |
339 | .server = 1, | |
88541c84 CL |
340 | .sap = svc_addr(rqstp), |
341 | .salen = rqstp->rq_addrlen, | |
7f1ed18b CL |
342 | .protocol = rqstp->rq_prot, |
343 | .version = rqstp->rq_vers, | |
344 | .hostname = hostname, | |
345 | .hostname_len = hostname_len, | |
66697bfd | 346 | .net = net, |
7f1ed18b | 347 | }; |
3cf7fb07 | 348 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
7f1ed18b | 349 | |
93f38b6f | 350 | dprintk("lockd: %s(host='%.*s', vers=%u, proto=%s)\n", __func__, |
7f1ed18b CL |
351 | (int)hostname_len, hostname, rqstp->rq_vers, |
352 | (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp")); | |
c98451bd | 353 | |
67216b94 CL |
354 | mutex_lock(&nlm_host_mutex); |
355 | ||
3cf7fb07 | 356 | if (time_after_eq(jiffies, ln->next_gc)) |
27adaddc | 357 | nlm_gc_hosts(net); |
67216b94 | 358 | |
d2df0484 | 359 | chain = &nlm_server_hosts[nlm_hash_address(ni.sap)]; |
b67bfe0d | 360 | hlist_for_each_entry(host, chain, h_hash) { |
66697bfd SK |
361 | if (host->net != net) |
362 | continue; | |
67216b94 CL |
363 | if (!rpc_cmp_addr(nlm_addr(host), ni.sap)) |
364 | continue; | |
365 | ||
366 | /* Same address. Share an NSM handle if we already have one */ | |
367 | if (nsm == NULL) | |
368 | nsm = host->h_nsmhandle; | |
369 | ||
370 | if (host->h_proto != ni.protocol) | |
371 | continue; | |
372 | if (host->h_version != ni.version) | |
373 | continue; | |
79691836 | 374 | if (!rpc_cmp_addr(nlm_srcaddr(host), src_sap)) |
67216b94 CL |
375 | continue; |
376 | ||
377 | /* Move to head of hash chain. */ | |
378 | hlist_del(&host->h_hash); | |
379 | hlist_add_head(&host->h_hash, chain); | |
380 | ||
381 | nlm_get_host(host); | |
382 | dprintk("lockd: %s found host %s (%s)\n", | |
383 | __func__, host->h_name, host->h_addrbuf); | |
384 | goto out; | |
385 | } | |
386 | ||
387 | host = nlm_alloc_host(&ni, nsm); | |
388 | if (unlikely(host == NULL)) | |
389 | goto out; | |
390 | ||
79691836 CL |
391 | memcpy(nlm_srcaddr(host), src_sap, src_len); |
392 | host->h_srcaddrlen = src_len; | |
67216b94 | 393 | hlist_add_head(&host->h_hash, chain); |
caa4e76b | 394 | ln->nrhosts++; |
67216b94 CL |
395 | nrhosts++; |
396 | ||
535cb8f3 TM |
397 | refcount_inc(&host->h_count); |
398 | ||
67216b94 CL |
399 | dprintk("lockd: %s created host %s (%s)\n", |
400 | __func__, host->h_name, host->h_addrbuf); | |
401 | ||
402 | out: | |
403 | mutex_unlock(&nlm_host_mutex); | |
404 | return host; | |
405 | } | |
406 | ||
407 | /** | |
408 | * nlmsvc_release_host - release server nlm_host | |
409 | * @host: nlm_host to release | |
410 | * | |
411 | * Host is destroyed later in nlm_gc_host(). | |
412 | */ | |
413 | void nlmsvc_release_host(struct nlm_host *host) | |
414 | { | |
415 | if (host == NULL) | |
416 | return; | |
417 | ||
418 | dprintk("lockd: release server host %s\n", host->h_name); | |
419 | ||
a2d30a54 | 420 | WARN_ON_ONCE(!host->h_server); |
fee21fb5 | 421 | refcount_dec(&host->h_count); |
c585646d AB |
422 | } |
423 | ||
1da177e4 LT |
424 | /* |
425 | * Create the NLM RPC client for an NLM peer | |
426 | */ | |
427 | struct rpc_clnt * | |
428 | nlm_bind_host(struct nlm_host *host) | |
429 | { | |
430 | struct rpc_clnt *clnt; | |
1da177e4 | 431 | |
1df40b60 CL |
432 | dprintk("lockd: nlm_bind_host %s (%s)\n", |
433 | host->h_name, host->h_addrbuf); | |
1da177e4 LT |
434 | |
435 | /* Lock host handle */ | |
50467914 | 436 | mutex_lock(&host->h_mutex); |
1da177e4 LT |
437 | |
438 | /* If we've already created an RPC client, check whether | |
439 | * RPC rebind is required | |
1da177e4 LT |
440 | */ |
441 | if ((clnt = host->h_rpcclnt) != NULL) { | |
9b82d88d | 442 | nlm_rebind_host(host); |
1da177e4 | 443 | } else { |
21051ba6 | 444 | unsigned long increment = nlmsvc_timeout; |
e1ec7892 CL |
445 | struct rpc_timeout timeparms = { |
446 | .to_initval = increment, | |
447 | .to_increment = increment, | |
448 | .to_maxval = increment * 6UL, | |
449 | .to_retries = 5U, | |
450 | }; | |
451 | struct rpc_create_args args = { | |
66697bfd | 452 | .net = host->net, |
e1ec7892 | 453 | .protocol = host->h_proto, |
b4ed58fd CL |
454 | .address = nlm_addr(host), |
455 | .addrsize = host->h_addrlen, | |
e1ec7892 CL |
456 | .timeout = &timeparms, |
457 | .servername = host->h_name, | |
458 | .program = &nlm_program, | |
459 | .version = host->h_version, | |
460 | .authflavor = RPC_AUTH_UNIX, | |
90bd17c8 | 461 | .flags = (RPC_CLNT_CREATE_NOPING | |
e6237b6f TM |
462 | RPC_CLNT_CREATE_AUTOBIND | |
463 | RPC_CLNT_CREATE_REUSEPORT), | |
b422df91 | 464 | .cred = host->h_cred, |
e1ec7892 CL |
465 | }; |
466 | ||
90bd17c8 JL |
467 | /* |
468 | * lockd retries server side blocks automatically so we want | |
469 | * those to be soft RPC calls. Client side calls need to be | |
470 | * hard RPC tasks. | |
471 | */ | |
472 | if (!host->h_server) | |
473 | args.flags |= RPC_CLNT_CREATE_HARDRTRY; | |
0cb2659b CL |
474 | if (host->h_noresvport) |
475 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; | |
8e35f8e7 TM |
476 | if (host->h_srcaddrlen) |
477 | args.saddress = nlm_srcaddr(host); | |
90bd17c8 | 478 | |
e1ec7892 CL |
479 | clnt = rpc_create(&args); |
480 | if (!IS_ERR(clnt)) | |
481 | host->h_rpcclnt = clnt; | |
482 | else { | |
483 | printk("lockd: couldn't create RPC handle for %s\n", host->h_name); | |
484 | clnt = NULL; | |
485 | } | |
1da177e4 LT |
486 | } |
487 | ||
50467914 | 488 | mutex_unlock(&host->h_mutex); |
1da177e4 | 489 | return clnt; |
1da177e4 LT |
490 | } |
491 | ||
9b82d88d CM |
492 | /** |
493 | * nlm_rebind_host - If needed, force a portmap lookup of the peer's lockd port | |
494 | * @host: NLM host handle for peer | |
495 | * | |
496 | * This is not needed when using a connection-oriented protocol, such as TCP. | |
497 | * The existing autobind mechanism is sufficient to force a rebind when | |
498 | * required, e.g. on connection state transitions. | |
1da177e4 LT |
499 | */ |
500 | void | |
501 | nlm_rebind_host(struct nlm_host *host) | |
502 | { | |
9b82d88d CM |
503 | if (host->h_proto != IPPROTO_UDP) |
504 | return; | |
505 | ||
1da177e4 | 506 | if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) { |
35f5a422 | 507 | rpc_force_rebind(host->h_rpcclnt); |
1da177e4 LT |
508 | host->h_nextrebind = jiffies + NLM_HOST_REBIND; |
509 | } | |
510 | } | |
511 | ||
512 | /* | |
513 | * Increment NLM host count | |
514 | */ | |
515 | struct nlm_host * nlm_get_host(struct nlm_host *host) | |
516 | { | |
517 | if (host) { | |
518 | dprintk("lockd: get host %s\n", host->h_name); | |
fee21fb5 | 519 | refcount_inc(&host->h_count); |
1da177e4 LT |
520 | host->h_expires = jiffies + NLM_HOST_EXPIRE; |
521 | } | |
522 | return host; | |
523 | } | |
524 | ||
b10e30f6 BF |
525 | static struct nlm_host *next_host_state(struct hlist_head *cache, |
526 | struct nsm_handle *nsm, | |
527 | const struct nlm_reboot *info) | |
528 | { | |
80c30e8d | 529 | struct nlm_host *host; |
b10e30f6 | 530 | struct hlist_head *chain; |
b10e30f6 BF |
531 | |
532 | mutex_lock(&nlm_host_mutex); | |
b67bfe0d | 533 | for_each_host(host, chain, cache) { |
b10e30f6 BF |
534 | if (host->h_nsmhandle == nsm |
535 | && host->h_nsmstate != info->state) { | |
536 | host->h_nsmstate = info->state; | |
537 | host->h_state++; | |
538 | ||
539 | nlm_get_host(host); | |
80c30e8d CL |
540 | mutex_unlock(&nlm_host_mutex); |
541 | return host; | |
b10e30f6 BF |
542 | } |
543 | } | |
80c30e8d | 544 | |
b10e30f6 | 545 | mutex_unlock(&nlm_host_mutex); |
80c30e8d | 546 | return NULL; |
b10e30f6 BF |
547 | } |
548 | ||
7fefc9cb CL |
549 | /** |
550 | * nlm_host_rebooted - Release all resources held by rebooted host | |
0ad95472 | 551 | * @net: network namespace |
7fefc9cb CL |
552 | * @info: pointer to decoded results of NLM_SM_NOTIFY call |
553 | * | |
554 | * We were notified that the specified host has rebooted. Release | |
555 | * all resources held by that peer. | |
cf712c24 | 556 | */ |
0ad95472 | 557 | void nlm_host_rebooted(const struct net *net, const struct nlm_reboot *info) |
cf712c24 | 558 | { |
5c8dd29c | 559 | struct nsm_handle *nsm; |
0cea3276 | 560 | struct nlm_host *host; |
cf712c24 | 561 | |
0ad95472 | 562 | nsm = nsm_reboot_lookup(net, info); |
8c7378fd | 563 | if (unlikely(nsm == NULL)) |
db4e4c9a | 564 | return; |
5c8dd29c OK |
565 | |
566 | /* Mark all hosts tied to this NSM state as having rebooted. | |
567 | * We run the loop repeatedly, because we drop the host table | |
568 | * lock for this. | |
569 | * To avoid processing a host several times, we match the nsmstate. | |
570 | */ | |
d2df0484 | 571 | while ((host = next_host_state(nlm_server_hosts, nsm, info)) != NULL) { |
8ea6ecc8 | 572 | nlmsvc_free_host_resources(host); |
67216b94 | 573 | nlmsvc_release_host(host); |
cf712c24 | 574 | } |
8ea6ecc8 CL |
575 | while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) { |
576 | nlmclnt_recovery(host); | |
577 | nlmclnt_release_host(host); | |
578 | } | |
579 | ||
cdd30fa1 | 580 | nsm_release(nsm); |
cf712c24 OK |
581 | } |
582 | ||
d5850ff9 SK |
583 | static void nlm_complain_hosts(struct net *net) |
584 | { | |
585 | struct hlist_head *chain; | |
d5850ff9 SK |
586 | struct nlm_host *host; |
587 | ||
588 | if (net) { | |
589 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
590 | ||
591 | if (ln->nrhosts == 0) | |
592 | return; | |
e919b076 VA |
593 | pr_warn("lockd: couldn't shutdown host module for net %x!\n", |
594 | net->ns.inum); | |
595 | dprintk("lockd: %lu hosts left in net %x:\n", ln->nrhosts, | |
596 | net->ns.inum); | |
d5850ff9 SK |
597 | } else { |
598 | if (nrhosts == 0) | |
599 | return; | |
600 | printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); | |
601 | dprintk("lockd: %lu hosts left:\n", nrhosts); | |
602 | } | |
603 | ||
b67bfe0d | 604 | for_each_host(host, chain, nlm_server_hosts) { |
d5850ff9 SK |
605 | if (net && host->net != net) |
606 | continue; | |
e919b076 | 607 | dprintk(" %s (cnt %d use %d exp %ld net %x)\n", |
fee21fb5 | 608 | host->h_name, refcount_read(&host->h_count), |
e919b076 | 609 | host->h_inuse, host->h_expires, host->net->ns.inum); |
d5850ff9 SK |
610 | } |
611 | } | |
612 | ||
1da177e4 | 613 | void |
3b64739f | 614 | nlm_shutdown_hosts_net(struct net *net) |
1da177e4 | 615 | { |
0cea3276 | 616 | struct hlist_head *chain; |
1da177e4 | 617 | struct nlm_host *host; |
1da177e4 | 618 | |
353ab6e9 | 619 | mutex_lock(&nlm_host_mutex); |
1da177e4 LT |
620 | |
621 | /* First, make all hosts eligible for gc */ | |
e919b076 VA |
622 | dprintk("lockd: nuking all hosts in net %x...\n", |
623 | net ? net->ns.inum : 0); | |
b67bfe0d | 624 | for_each_host(host, chain, nlm_server_hosts) { |
3b64739f SK |
625 | if (net && host->net != net) |
626 | continue; | |
b1137468 BF |
627 | host->h_expires = jiffies - 1; |
628 | if (host->h_rpcclnt) { | |
629 | rpc_shutdown_client(host->h_rpcclnt); | |
630 | host->h_rpcclnt = NULL; | |
d801b861 | 631 | } |
bfca7a6f | 632 | nlmsvc_free_host_resources(host); |
1da177e4 LT |
633 | } |
634 | ||
635 | /* Then, perform a garbage collection pass */ | |
27adaddc | 636 | nlm_gc_hosts(net); |
d5850ff9 | 637 | nlm_complain_hosts(net); |
9e137ed5 | 638 | mutex_unlock(&nlm_host_mutex); |
3b64739f SK |
639 | } |
640 | ||
641 | /* | |
642 | * Shut down the hosts module. | |
643 | * Note that this routine is called only at server shutdown time. | |
644 | */ | |
645 | void | |
646 | nlm_shutdown_hosts(void) | |
647 | { | |
e2edaa98 | 648 | dprintk("lockd: shutting down host module\n"); |
3b64739f | 649 | nlm_shutdown_hosts_net(NULL); |
1da177e4 LT |
650 | } |
651 | ||
652 | /* | |
653 | * Garbage collect any unused NLM hosts. | |
654 | * This GC combines reference counting for async operations with | |
655 | * mark & sweep for resources held by remote clients. | |
656 | */ | |
657 | static void | |
27adaddc | 658 | nlm_gc_hosts(struct net *net) |
1da177e4 | 659 | { |
0cea3276 | 660 | struct hlist_head *chain; |
b67bfe0d | 661 | struct hlist_node *next; |
0cea3276 | 662 | struct nlm_host *host; |
1da177e4 | 663 | |
e919b076 VA |
664 | dprintk("lockd: host garbage collection for net %x\n", |
665 | net ? net->ns.inum : 0); | |
b67bfe0d | 666 | for_each_host(host, chain, nlm_server_hosts) { |
27adaddc SK |
667 | if (net && host->net != net) |
668 | continue; | |
b1137468 | 669 | host->h_inuse = 0; |
27adaddc | 670 | } |
1da177e4 LT |
671 | |
672 | /* Mark all hosts that hold locks, blocks or shares */ | |
b26411f8 | 673 | nlmsvc_mark_resources(net); |
1da177e4 | 674 | |
b67bfe0d | 675 | for_each_host_safe(host, next, chain, nlm_server_hosts) { |
27adaddc SK |
676 | if (net && host->net != net) |
677 | continue; | |
535cb8f3 | 678 | if (host->h_inuse || time_before(jiffies, host->h_expires)) { |
b1137468 | 679 | dprintk("nlm_gc_hosts skipping %s " |
e919b076 | 680 | "(cnt %d use %d exp %ld net %x)\n", |
fee21fb5 | 681 | host->h_name, refcount_read(&host->h_count), |
e919b076 VA |
682 | host->h_inuse, host->h_expires, |
683 | host->net->ns.inum); | |
b1137468 | 684 | continue; |
1da177e4 | 685 | } |
535cb8f3 TM |
686 | if (refcount_dec_if_one(&host->h_count)) |
687 | nlm_destroy_host_locked(host); | |
1da177e4 LT |
688 | } |
689 | ||
3cf7fb07 SK |
690 | if (net) { |
691 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
692 | ||
693 | ln->next_gc = jiffies + NLM_HOST_COLLECT; | |
694 | } | |
1da177e4 | 695 | } |