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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/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
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};
72
73
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75
76
77
78
79#define NSM_ADDRBUF ((8 * 4 + 7) + (1 + 10) + 1)
80
81struct nsm_handle {
82 struct list_head sm_link;
83 atomic_t sm_count;
84 char *sm_mon_name;
85 char *sm_name;
86 struct sockaddr_storage sm_addr;
87 size_t sm_addrlen;
88 unsigned int sm_monitored : 1,
89 sm_sticky : 1;
90 struct nsm_private sm_priv;
91 char sm_addrbuf[NSM_ADDRBUF];
92};
93
94
95
96
97static inline struct sockaddr_in *nlm_addr_in(const struct nlm_host *host)
98{
99 return (struct sockaddr_in *)&host->h_addr;
100}
101
102static inline struct sockaddr *nlm_addr(const struct nlm_host *host)
103{
104 return (struct sockaddr *)&host->h_addr;
105}
106
107static inline struct sockaddr_in *nlm_srcaddr_in(const struct nlm_host *host)
108{
109 return (struct sockaddr_in *)&host->h_srcaddr;
110}
111
112static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
113{
114 return (struct sockaddr *)&host->h_srcaddr;
115}
116
117
118
119
120struct nlm_lockowner {
121 struct list_head list;
122 atomic_t count;
123
124 struct nlm_host *host;
125 fl_owner_t owner;
126 uint32_t pid;
127};
128
129struct nlm_wait;
130
131
132
133
134#define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
135struct nlm_rqst {
136 atomic_t a_count;
137 unsigned int a_flags;
138 struct nlm_host * a_host;
139 struct nlm_args a_args;
140 struct nlm_res a_res;
141 struct nlm_block * a_block;
142 unsigned int a_retries;
143 u8 a_owner[NLMCLNT_OHSIZE];
144};
145
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148
149
150struct nlm_file {
151 struct hlist_node f_list;
152 struct nfs_fh f_handle;
153 struct file * f_file;
154 struct nlm_share * f_shares;
155 struct list_head f_blocks;
156 unsigned int f_locks;
157 unsigned int f_count;
158 struct mutex f_mutex;
159};
160
161
162
163
164
165#define NLM_NEVER (~(unsigned long) 0)
166
167#define NLM_TIMEOUT (7 * HZ)
168
169struct nlm_block {
170 struct kref b_count;
171 struct list_head b_list;
172 struct list_head b_flist;
173 struct nlm_rqst * b_call;
174 struct svc_serv * b_daemon;
175 struct nlm_host * b_host;
176 unsigned long b_when;
177 unsigned int b_id;
178 unsigned char b_granted;
179 struct nlm_file * b_file;
180 struct cache_req * b_cache_req;
181 struct file_lock * b_fl;
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 nlm_reboot *);
240
241
242
243
244int nsm_monitor(const struct nlm_host *host);
245void nsm_unmonitor(const struct nlm_host *host);
246
247struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
248 const size_t salen,
249 const char *hostname,
250 const size_t hostname_len);
251struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info);
252void nsm_release(struct nsm_handle *nsm);
253
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256
257
258typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
259
260
261
262
263__be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
264 struct nlm_host *, struct nlm_lock *, int,
265 struct nlm_cookie *, int);
266__be32 nlmsvc_unlock(struct net *net, struct nlm_file *, struct nlm_lock *);
267__be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
268 struct nlm_host *, struct nlm_lock *,
269 struct nlm_lock *, struct nlm_cookie *);
270__be32 nlmsvc_cancel_blocked(struct net *net, struct nlm_file *, struct nlm_lock *);
271unsigned long nlmsvc_retry_blocked(void);
272void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
273 nlm_host_match_fn_t match);
274void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
275void nlmsvc_release_call(struct nlm_rqst *);
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279
280__be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
281 struct nfs_fh *);
282void nlm_release_file(struct nlm_file *);
283void nlmsvc_mark_resources(struct net *);
284void nlmsvc_free_host_resources(struct nlm_host *);
285void nlmsvc_invalidate_all(void);
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289
290int nlmsvc_unlock_all_by_sb(struct super_block *sb);
291int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
292
293static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
294{
295 return file_inode(file->f_file);
296}
297
298static inline int __nlm_privileged_request4(const struct sockaddr *sap)
299{
300 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
301
302 if (ntohs(sin->sin_port) > 1023)
303 return 0;
304
305 return ipv4_is_loopback(sin->sin_addr.s_addr);
306}
307
308#if IS_ENABLED(CONFIG_IPV6)
309static inline int __nlm_privileged_request6(const struct sockaddr *sap)
310{
311 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
312
313 if (ntohs(sin6->sin6_port) > 1023)
314 return 0;
315
316 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
317 return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]);
318
319 return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK;
320}
321#else
322static inline int __nlm_privileged_request6(const struct sockaddr *sap)
323{
324 return 0;
325}
326#endif
327
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332
333
334static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
335{
336 const struct sockaddr *sap = svc_addr(rqstp);
337
338 switch (sap->sa_family) {
339 case AF_INET:
340 return __nlm_privileged_request4(sap);
341 case AF_INET6:
342 return __nlm_privileged_request6(sap);
343 default:
344 return 0;
345 }
346}
347
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350
351
352static inline int nlm_compare_locks(const struct file_lock *fl1,
353 const struct file_lock *fl2)
354{
355 return fl1->fl_pid == fl2->fl_pid
356 && fl1->fl_owner == fl2->fl_owner
357 && fl1->fl_start == fl2->fl_start
358 && fl1->fl_end == fl2->fl_end
359 &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK);
360}
361
362extern const struct lock_manager_operations nlmsvc_lock_operations;
363
364#endif
365
366#endif
367