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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/lockd/bind.h>
21#include <linux/lockd/xdr.h>
22#ifdef CONFIG_LOCKD_V4
23#include <linux/lockd/xdr4.h>
24#endif
25#include <linux/lockd/debug.h>
26#include <linux/sunrpc/svc.h>
27
28
29
30
31#define LOCKD_VERSION "0.5"
32
33
34
35
36#define LOCKD_DFLT_TIMEO 10
37
38
39
40
41struct nlm_host {
42 struct hlist_node h_hash;
43 struct sockaddr_storage h_addr;
44 size_t h_addrlen;
45 struct sockaddr_storage h_srcaddr;
46 size_t h_srcaddrlen;
47 struct rpc_clnt *h_rpcclnt;
48 char *h_name;
49 u32 h_version;
50 unsigned short h_proto;
51 unsigned short h_reclaiming : 1,
52 h_server : 1,
53 h_noresvport : 1,
54 h_inuse : 1;
55 wait_queue_head_t h_gracewait;
56 struct rw_semaphore h_rwsem;
57 u32 h_state;
58 u32 h_nsmstate;
59 u32 h_pidcount;
60 atomic_t h_count;
61 struct mutex h_mutex;
62 unsigned long h_nextrebind;
63 unsigned long h_expires;
64 struct list_head h_lockowners;
65 spinlock_t h_lock;
66 struct list_head h_granted;
67 struct list_head h_reclaim;
68 struct nsm_handle *h_nsmhandle;
69 char *h_addrbuf;
70 struct net *net;
71 char nodename[UNX_MAXNODENAME + 1];
72};
73
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78
79
80#define NSM_ADDRBUF ((8 * 4 + 7) + (1 + 10) + 1)
81
82struct nsm_handle {
83 struct list_head sm_link;
84 atomic_t sm_count;
85 char *sm_mon_name;
86 char *sm_name;
87 struct sockaddr_storage sm_addr;
88 size_t sm_addrlen;
89 unsigned int sm_monitored : 1,
90 sm_sticky : 1;
91 struct nsm_private sm_priv;
92 char sm_addrbuf[NSM_ADDRBUF];
93};
94
95
96
97
98static inline struct sockaddr_in *nlm_addr_in(const struct nlm_host *host)
99{
100 return (struct sockaddr_in *)&host->h_addr;
101}
102
103static inline struct sockaddr *nlm_addr(const struct nlm_host *host)
104{
105 return (struct sockaddr *)&host->h_addr;
106}
107
108static inline struct sockaddr_in *nlm_srcaddr_in(const struct nlm_host *host)
109{
110 return (struct sockaddr_in *)&host->h_srcaddr;
111}
112
113static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
114{
115 return (struct sockaddr *)&host->h_srcaddr;
116}
117
118
119
120
121struct nlm_lockowner {
122 struct list_head list;
123 atomic_t count;
124
125 struct nlm_host *host;
126 fl_owner_t owner;
127 uint32_t pid;
128};
129
130struct nlm_wait;
131
132
133
134
135#define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
136struct nlm_rqst {
137 atomic_t a_count;
138 unsigned int a_flags;
139 struct nlm_host * a_host;
140 struct nlm_args a_args;
141 struct nlm_res a_res;
142 struct nlm_block * a_block;
143 unsigned int a_retries;
144 u8 a_owner[NLMCLNT_OHSIZE];
145};
146
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150
151struct nlm_file {
152 struct hlist_node f_list;
153 struct nfs_fh f_handle;
154 struct file * f_file;
155 struct nlm_share * f_shares;
156 struct list_head f_blocks;
157 unsigned int f_locks;
158 unsigned int f_count;
159 struct mutex f_mutex;
160};
161
162
163
164
165
166#define NLM_NEVER (~(unsigned long) 0)
167
168#define NLM_TIMEOUT (7 * HZ)
169
170struct nlm_block {
171 struct kref b_count;
172 struct list_head b_list;
173 struct list_head b_flist;
174 struct nlm_rqst * b_call;
175 struct svc_serv * b_daemon;
176 struct nlm_host * b_host;
177 unsigned long b_when;
178 unsigned int b_id;
179 unsigned char b_granted;
180 struct nlm_file * b_file;
181 struct cache_req * b_cache_req;
182 struct cache_deferred_req * b_deferred_req;
183 unsigned int b_flags;
184#define B_QUEUED 1
185#define B_GOT_CALLBACK 2
186#define B_TIMED_OUT 4
187};
188
189
190
191
192extern const struct rpc_program nlm_program;
193extern struct svc_procedure nlmsvc_procedures[];
194#ifdef CONFIG_LOCKD_V4
195extern struct svc_procedure nlmsvc_procedures4[];
196#endif
197extern int nlmsvc_grace_period;
198extern unsigned long nlmsvc_timeout;
199extern bool nsm_use_hostnames;
200extern u32 nsm_local_state;
201
202
203
204
205struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
206int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *);
207int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *);
208void nlmclnt_release_call(struct nlm_rqst *);
209struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
210void nlmclnt_finish_block(struct nlm_wait *block);
211int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
212__be32 nlmclnt_grant(const struct sockaddr *addr,
213 const struct nlm_lock *lock);
214void nlmclnt_recovery(struct nlm_host *);
215int nlmclnt_reclaim(struct nlm_host *, struct file_lock *,
216 struct nlm_rqst *);
217void nlmclnt_next_cookie(struct nlm_cookie *);
218
219
220
221
222struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
223 const size_t salen,
224 const unsigned short protocol,
225 const u32 version,
226 const char *hostname,
227 int noresvport,
228 struct net *net);
229void nlmclnt_release_host(struct nlm_host *);
230struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
231 const char *hostname,
232 const size_t hostname_len);
233void nlmsvc_release_host(struct nlm_host *);
234struct rpc_clnt * nlm_bind_host(struct nlm_host *);
235void nlm_rebind_host(struct nlm_host *);
236struct nlm_host * nlm_get_host(struct nlm_host *);
237void nlm_shutdown_hosts(void);
238void nlm_shutdown_hosts_net(struct net *net);
239void nlm_host_rebooted(const struct net *net,
240 const struct nlm_reboot *);
241
242
243
244
245int nsm_monitor(const struct nlm_host *host);
246void nsm_unmonitor(const struct nlm_host *host);
247
248struct nsm_handle *nsm_get_handle(const struct net *net,
249 const struct sockaddr *sap,
250 const size_t salen,
251 const char *hostname,
252 const size_t hostname_len);
253struct nsm_handle *nsm_reboot_lookup(const struct net *net,
254 const struct nlm_reboot *info);
255void nsm_release(struct nsm_handle *nsm);
256
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259
260
261typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
262
263
264
265
266__be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
267 struct nlm_host *, struct nlm_lock *, int,
268 struct nlm_cookie *, int);
269__be32 nlmsvc_unlock(struct net *net, struct nlm_file *, struct nlm_lock *);
270__be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
271 struct nlm_host *, struct nlm_lock *,
272 struct nlm_lock *, struct nlm_cookie *);
273__be32 nlmsvc_cancel_blocked(struct net *net, struct nlm_file *, struct nlm_lock *);
274unsigned long nlmsvc_retry_blocked(void);
275void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
276 nlm_host_match_fn_t match);
277void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
278void nlmsvc_release_call(struct nlm_rqst *);
279
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281
282
283__be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
284 struct nfs_fh *);
285void nlm_release_file(struct nlm_file *);
286void nlmsvc_mark_resources(struct net *);
287void nlmsvc_free_host_resources(struct nlm_host *);
288void nlmsvc_invalidate_all(void);
289
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292
293int nlmsvc_unlock_all_by_sb(struct super_block *sb);
294int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
295
296static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
297{
298 return file_inode(file->f_file);
299}
300
301static inline int __nlm_privileged_request4(const struct sockaddr *sap)
302{
303 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
304
305 if (ntohs(sin->sin_port) > 1023)
306 return 0;
307
308 return ipv4_is_loopback(sin->sin_addr.s_addr);
309}
310
311#if IS_ENABLED(CONFIG_IPV6)
312static inline int __nlm_privileged_request6(const struct sockaddr *sap)
313{
314 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
315
316 if (ntohs(sin6->sin6_port) > 1023)
317 return 0;
318
319 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
320 return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]);
321
322 return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK;
323}
324#else
325static inline int __nlm_privileged_request6(const struct sockaddr *sap)
326{
327 return 0;
328}
329#endif
330
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336
337static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
338{
339 const struct sockaddr *sap = svc_addr(rqstp);
340
341 switch (sap->sa_family) {
342 case AF_INET:
343 return __nlm_privileged_request4(sap);
344 case AF_INET6:
345 return __nlm_privileged_request6(sap);
346 default:
347 return 0;
348 }
349}
350
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353
354
355static inline int nlm_compare_locks(const struct file_lock *fl1,
356 const struct file_lock *fl2)
357{
358 return fl1->fl_pid == fl2->fl_pid
359 && fl1->fl_owner == fl2->fl_owner
360 && fl1->fl_start == fl2->fl_start
361 && fl1->fl_end == fl2->fl_end
362 &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK);
363}
364
365extern const struct lock_manager_operations nlmsvc_lock_operations;
366
367#endif
368
369#endif
370