1 /*
2 * linux/include/linux/lockd/lockd.h
3 *
4 * General-purpose lockd include file.
5 *
6 * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
7 */
8
9 #ifndef LINUX_LOCKD_LOCKD_H
10 #define LINUX_LOCKD_LOCKD_H
11
12 #ifdef __KERNEL__
13
14 #include <linux/in.h>
15 #include <linux/in6.h>
16 #include <net/ipv6.h>
17 #include <linux/fs.h>
18 #include <linux/kref.h>
19 #include <linux/utsname.h>
20 #include <linux/nfsd/nfsfh.h>
21 #include <linux/lockd/bind.h>
22 #include <linux/lockd/xdr.h>
23 #ifdef CONFIG_LOCKD_V4
24 #include <linux/lockd/xdr4.h>
25 #endif
26 #include <linux/lockd/debug.h>
27
28 /*
29 * Version string
30 */
31 #define LOCKD_VERSION "0.5"
32
33 /*
34 * Default timeout for RPC calls (seconds)
35 */
36 #define LOCKD_DFLT_TIMEO 10
37
38 /*
39 * Lockd host handle (used both by the client and server personality).
40 */
41 struct nlm_host {
42 struct hlist_node h_hash; /* doubly linked list */
43 struct sockaddr_storage h_addr; /* peer address */
44 size_t h_addrlen;
45 struct sockaddr_storage h_srcaddr; /* our address (optional) */
46 struct rpc_clnt *h_rpcclnt; /* RPC client to talk to peer */
47 char *h_name; /* remote hostname */
48 u32 h_version; /* interface version */
49 unsigned short h_proto; /* transport proto */
50 unsigned short h_reclaiming : 1,
51 h_server : 1, /* server side, not client side */
52 h_noresvport : 1,
53 h_inuse : 1;
54 wait_queue_head_t h_gracewait; /* wait while reclaiming */
55 struct rw_semaphore h_rwsem; /* Reboot recovery lock */
56 u32 h_state; /* pseudo-state counter */
57 u32 h_nsmstate; /* true remote NSM state */
58 u32 h_pidcount; /* Pseudopids */
59 atomic_t h_count; /* reference count */
60 struct mutex h_mutex; /* mutex for pmap binding */
61 unsigned long h_nextrebind; /* next portmap call */
62 unsigned long h_expires; /* eligible for GC */
63 struct list_head h_lockowners; /* Lockowners for the client */
64 spinlock_t h_lock;
65 struct list_head h_granted; /* Locks in GRANTED state */
66 struct list_head h_reclaim; /* Locks in RECLAIM state */
67 struct nsm_handle *h_nsmhandle; /* NSM status handle */
68 char *h_addrbuf; /* address eyecatcher */
69 };
70
71 /*
72 * The largest string sm_addrbuf should hold is a full-size IPv6 address
73 * (no "::" anywhere) with a scope ID. The buffer size is computed to
74 * hold eight groups of colon-separated four-hex-digit numbers, a
75 * percent sign, a scope id (at most 32 bits, in decimal), and NUL.
76 */
77 #define NSM_ADDRBUF ((8 * 4 + 7) + (1 + 10) + 1)
78
79 struct nsm_handle {
80 struct list_head sm_link;
81 atomic_t sm_count;
82 char *sm_mon_name;
83 char *sm_name;
84 struct sockaddr_storage sm_addr;
85 size_t sm_addrlen;
86 unsigned int sm_monitored : 1,
87 sm_sticky : 1; /* don't unmonitor */
88 struct nsm_private sm_priv;
89 char sm_addrbuf[NSM_ADDRBUF];
90 };
91
92 /*
93 * Rigorous type checking on sockaddr type conversions
94 */
95 static inline struct sockaddr_in *nlm_addr_in(const struct nlm_host *host)
96 {
97 return (struct sockaddr_in *)&host->h_addr;
98 }
99
100 static inline struct sockaddr *nlm_addr(const struct nlm_host *host)
101 {
102 return (struct sockaddr *)&host->h_addr;
103 }
104
105 static inline struct sockaddr_in *nlm_srcaddr_in(const struct nlm_host *host)
106 {
107 return (struct sockaddr_in *)&host->h_srcaddr;
108 }
109
110 static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
111 {
112 return (struct sockaddr *)&host->h_srcaddr;
113 }
114
115 /*
116 * Map an fl_owner_t into a unique 32-bit "pid"
117 */
118 struct nlm_lockowner {
119 struct list_head list;
120 atomic_t count;
121
122 struct nlm_host *host;
123 fl_owner_t owner;
124 uint32_t pid;
125 };
126
127 struct nlm_wait;
128
129 /*
130 * Memory chunk for NLM client RPC request.
131 */
132 #define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
133 struct nlm_rqst {
134 atomic_t a_count;
135 unsigned int a_flags; /* initial RPC task flags */
136 struct nlm_host * a_host; /* host handle */
137 struct nlm_args a_args; /* arguments */
138 struct nlm_res a_res; /* result */
139 struct nlm_block * a_block;
140 unsigned int a_retries; /* Retry count */
141 u8 a_owner[NLMCLNT_OHSIZE];
142 };
143
144 /*
145 * This struct describes a file held open by lockd on behalf of
146 * an NFS client.
147 */
148 struct nlm_file {
149 struct hlist_node f_list; /* linked list */
150 struct nfs_fh f_handle; /* NFS file handle */
151 struct file * f_file; /* VFS file pointer */
152 struct nlm_share * f_shares; /* DOS shares */
153 struct list_head f_blocks; /* blocked locks */
154 unsigned int f_locks; /* guesstimate # of locks */
155 unsigned int f_count; /* reference count */
156 struct mutex f_mutex; /* avoid concurrent access */
157 };
158
159 /*
160 * This is a server block (i.e. a lock requested by some client which
161 * couldn't be granted because of a conflicting lock).
162 */
163 #define NLM_NEVER (~(unsigned long) 0)
164 /* timeout on non-blocking call: */
165 #define NLM_TIMEOUT (7 * HZ)
166
167 struct nlm_block {
168 struct kref b_count; /* Reference count */
169 struct list_head b_list; /* linked list of all blocks */
170 struct list_head b_flist; /* linked list (per file) */
171 struct nlm_rqst * b_call; /* RPC args & callback info */
172 struct svc_serv * b_daemon; /* NLM service */
173 struct nlm_host * b_host; /* host handle for RPC clnt */
174 unsigned long b_when; /* next re-xmit */
175 unsigned int b_id; /* block id */
176 unsigned char b_granted; /* VFS granted lock */
177 struct nlm_file * b_file; /* file in question */
178 struct cache_req * b_cache_req; /* deferred request handling */
179 struct file_lock * b_fl; /* set for GETLK */
180 struct cache_deferred_req * b_deferred_req;
181 unsigned int b_flags; /* block flags */
182 #define B_QUEUED 1 /* lock queued */
183 #define B_GOT_CALLBACK 2 /* got lock or conflicting lock */
184 #define B_TIMED_OUT 4 /* filesystem too slow to respond */
185 };
186
187 /*
188 * Global variables
189 */
190 extern struct rpc_program nlm_program;
191 extern struct svc_procedure nlmsvc_procedures[];
192 #ifdef CONFIG_LOCKD_V4
193 extern struct svc_procedure nlmsvc_procedures4[];
194 #endif
195 extern int nlmsvc_grace_period;
196 extern unsigned long nlmsvc_timeout;
197 extern int nsm_use_hostnames;
198 extern u32 nsm_local_state;
199
200 /*
201 * Lockd client functions
202 */
203 struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
204 void nlm_release_call(struct nlm_rqst *);
205 int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *);
206 int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *);
207 struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
208 void nlmclnt_finish_block(struct nlm_wait *block);
209 int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
210 __be32 nlmclnt_grant(const struct sockaddr *addr,
211 const struct nlm_lock *lock);
212 void nlmclnt_recovery(struct nlm_host *);
213 int nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
214 void nlmclnt_next_cookie(struct nlm_cookie *);
215
216 /*
217 * Host cache
218 */
219 struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
220 const size_t salen,
221 const unsigned short protocol,
222 const u32 version,
223 const char *hostname,
224 int noresvport);
225 struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
226 const char *hostname,
227 const size_t hostname_len);
228 struct rpc_clnt * nlm_bind_host(struct nlm_host *);
229 void nlm_rebind_host(struct nlm_host *);
230 struct nlm_host * nlm_get_host(struct nlm_host *);
231 void nlm_release_host(struct nlm_host *);
232 void nlm_shutdown_hosts(void);
233 void nlm_host_rebooted(const struct nlm_reboot *);
234
235 /*
236 * Host monitoring
237 */
238 int nsm_monitor(const struct nlm_host *host);
239 void nsm_unmonitor(const struct nlm_host *host);
240
241 struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
242 const size_t salen,
243 const char *hostname,
244 const size_t hostname_len);
245 struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info);
246 void nsm_release(struct nsm_handle *nsm);
247
248 /*
249 * This is used in garbage collection and resource reclaim
250 * A return value != 0 means destroy the lock/block/share
251 */
252 typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
253
254 /*
255 * Server-side lock handling
256 */
257 __be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
258 struct nlm_host *, struct nlm_lock *, int,
259 struct nlm_cookie *, int);
260 __be32 nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
261 __be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
262 struct nlm_host *, struct nlm_lock *,
263 struct nlm_lock *, struct nlm_cookie *);
264 __be32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *);
265 unsigned long nlmsvc_retry_blocked(void);
266 void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
267 nlm_host_match_fn_t match);
268 void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
269
270 /*
271 * File handling for the server personality
272 */
273 __be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
274 struct nfs_fh *);
275 void nlm_release_file(struct nlm_file *);
276 void nlmsvc_mark_resources(void);
277 void nlmsvc_free_host_resources(struct nlm_host *);
278 void nlmsvc_invalidate_all(void);
279
280 /*
281 * Cluster failover support
282 */
283 int nlmsvc_unlock_all_by_sb(struct super_block *sb);
284 int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
285
286 static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
287 {
288 return file->f_file->f_path.dentry->d_inode;
289 }
290
291 static inline int __nlm_privileged_request4(const struct sockaddr *sap)
292 {
293 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
294
295 if (ntohs(sin->sin_port) > 1023)
296 return 0;
297
298 return ipv4_is_loopback(sin->sin_addr.s_addr);
299 }
300
301 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
302 static inline int __nlm_privileged_request6(const struct sockaddr *sap)
303 {
304 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
305
306 if (ntohs(sin6->sin6_port) > 1023)
307 return 0;
308
309 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
310 return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]);
311
312 return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK;
313 }
314 #else /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
315 static inline int __nlm_privileged_request6(const struct sockaddr *sap)
316 {
317 return 0;
318 }
319 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
320
321 /*
322 * Ensure incoming requests are from local privileged callers.
323 *
324 * Return TRUE if sender is local and is connecting via a privileged port;
325 * otherwise return FALSE.
326 */
327 static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
328 {
329 const struct sockaddr *sap = svc_addr(rqstp);
330
331 switch (sap->sa_family) {
332 case AF_INET:
333 return __nlm_privileged_request4(sap);
334 case AF_INET6:
335 return __nlm_privileged_request6(sap);
336 default:
337 return 0;
338 }
339 }
340
341 static inline int __nlm_cmp_addr4(const struct sockaddr *sap1,
342 const struct sockaddr *sap2)
343 {
344 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sap1;
345 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sap2;
346 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
347 }
348
349 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
350 static inline int __nlm_cmp_addr6(const struct sockaddr *sap1,
351 const struct sockaddr *sap2)
352 {
353 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sap1;
354 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sap2;
355 return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr);
356 }
357 #else /* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
358 static inline int __nlm_cmp_addr6(const struct sockaddr *sap1,
359 const struct sockaddr *sap2)
360 {
361 return 0;
362 }
363 #endif /* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
364
365 /*
366 * Compare two host addresses
367 *
368 * Return TRUE if the addresses are the same; otherwise FALSE.
369 */
370 static inline int nlm_cmp_addr(const struct sockaddr *sap1,
371 const struct sockaddr *sap2)
372 {
373 if (sap1->sa_family == sap2->sa_family) {
374 switch (sap1->sa_family) {
375 case AF_INET:
376 return __nlm_cmp_addr4(sap1, sap2);
377 case AF_INET6:
378 return __nlm_cmp_addr6(sap1, sap2);
379 }
380 }
381 return 0;
382 }
383
384 /*
385 * Compare two NLM locks.
386 * When the second lock is of type F_UNLCK, this acts like a wildcard.
387 */
388 static inline int nlm_compare_locks(const struct file_lock *fl1,
389 const struct file_lock *fl2)
390 {
391 return fl1->fl_pid == fl2->fl_pid
392 && fl1->fl_owner == fl2->fl_owner
393 && fl1->fl_start == fl2->fl_start
394 && fl1->fl_end == fl2->fl_end
395 &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK);
396 }
397
398 extern struct lock_manager_operations nlmsvc_lock_operations;
399
400 #endif /* __KERNEL__ */
401
402 #endif /* LINUX_LOCKD_LOCKD_H */
403
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