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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/lockd/xdr.c | |
3 | * | |
4 | * XDR support for lockd and the lock client. | |
5 | * | |
6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/sched.h> | |
1da177e4 LT |
11 | #include <linux/nfs.h> |
12 | ||
13 | #include <linux/sunrpc/xdr.h> | |
14 | #include <linux/sunrpc/clnt.h> | |
15 | #include <linux/sunrpc/svc.h> | |
16 | #include <linux/sunrpc/stats.h> | |
17 | #include <linux/lockd/lockd.h> | |
1da177e4 | 18 | |
9c69de4c CH |
19 | #include <uapi/linux/nfs2.h> |
20 | ||
1da177e4 LT |
21 | #define NLMDBG_FACILITY NLMDBG_XDR |
22 | ||
23 | ||
24 | static inline loff_t | |
25 | s32_to_loff_t(__s32 offset) | |
26 | { | |
27 | return (loff_t)offset; | |
28 | } | |
29 | ||
30 | static inline __s32 | |
31 | loff_t_to_s32(loff_t offset) | |
32 | { | |
33 | __s32 res; | |
34 | if (offset >= NLM_OFFSET_MAX) | |
35 | res = NLM_OFFSET_MAX; | |
36 | else if (offset <= -NLM_OFFSET_MAX) | |
37 | res = -NLM_OFFSET_MAX; | |
38 | else | |
39 | res = offset; | |
40 | return res; | |
41 | } | |
42 | ||
43 | /* | |
44 | * XDR functions for basic NLM types | |
45 | */ | |
52921e02 | 46 | static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c) |
1da177e4 LT |
47 | { |
48 | unsigned int len; | |
49 | ||
50 | len = ntohl(*p++); | |
51 | ||
52 | if(len==0) | |
53 | { | |
54 | c->len=4; | |
55 | memset(c->data, 0, 4); /* hockeypux brain damage */ | |
56 | } | |
57 | else if(len<=NLM_MAXCOOKIELEN) | |
58 | { | |
59 | c->len=len; | |
60 | memcpy(c->data, p, len); | |
61 | p+=XDR_QUADLEN(len); | |
62 | } | |
63 | else | |
64 | { | |
e159a08b CL |
65 | dprintk("lockd: bad cookie size %d (only cookies under " |
66 | "%d bytes are supported.)\n", | |
67 | len, NLM_MAXCOOKIELEN); | |
1da177e4 LT |
68 | return NULL; |
69 | } | |
70 | return p; | |
71 | } | |
72 | ||
52921e02 AV |
73 | static inline __be32 * |
74 | nlm_encode_cookie(__be32 *p, struct nlm_cookie *c) | |
1da177e4 LT |
75 | { |
76 | *p++ = htonl(c->len); | |
77 | memcpy(p, c->data, c->len); | |
78 | p+=XDR_QUADLEN(c->len); | |
79 | return p; | |
80 | } | |
81 | ||
52921e02 AV |
82 | static __be32 * |
83 | nlm_decode_fh(__be32 *p, struct nfs_fh *f) | |
1da177e4 LT |
84 | { |
85 | unsigned int len; | |
86 | ||
87 | if ((len = ntohl(*p++)) != NFS2_FHSIZE) { | |
e159a08b | 88 | dprintk("lockd: bad fhandle size %d (should be %d)\n", |
1da177e4 LT |
89 | len, NFS2_FHSIZE); |
90 | return NULL; | |
91 | } | |
92 | f->size = NFS2_FHSIZE; | |
93 | memset(f->data, 0, sizeof(f->data)); | |
94 | memcpy(f->data, p, NFS2_FHSIZE); | |
95 | return p + XDR_QUADLEN(NFS2_FHSIZE); | |
96 | } | |
97 | ||
52921e02 AV |
98 | static inline __be32 * |
99 | nlm_encode_fh(__be32 *p, struct nfs_fh *f) | |
1da177e4 LT |
100 | { |
101 | *p++ = htonl(NFS2_FHSIZE); | |
102 | memcpy(p, f->data, NFS2_FHSIZE); | |
103 | return p + XDR_QUADLEN(NFS2_FHSIZE); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Encode and decode owner handle | |
108 | */ | |
52921e02 AV |
109 | static inline __be32 * |
110 | nlm_decode_oh(__be32 *p, struct xdr_netobj *oh) | |
1da177e4 LT |
111 | { |
112 | return xdr_decode_netobj(p, oh); | |
113 | } | |
114 | ||
52921e02 AV |
115 | static inline __be32 * |
116 | nlm_encode_oh(__be32 *p, struct xdr_netobj *oh) | |
1da177e4 LT |
117 | { |
118 | return xdr_encode_netobj(p, oh); | |
119 | } | |
120 | ||
52921e02 AV |
121 | static __be32 * |
122 | nlm_decode_lock(__be32 *p, struct nlm_lock *lock) | |
1da177e4 LT |
123 | { |
124 | struct file_lock *fl = &lock->fl; | |
125 | s32 start, len, end; | |
126 | ||
127 | if (!(p = xdr_decode_string_inplace(p, &lock->caller, | |
128 | &lock->len, | |
129 | NLM_MAXSTRLEN)) | |
130 | || !(p = nlm_decode_fh(p, &lock->fh)) | |
131 | || !(p = nlm_decode_oh(p, &lock->oh))) | |
132 | return NULL; | |
7bab377f | 133 | lock->svid = ntohl(*p++); |
1da177e4 LT |
134 | |
135 | locks_init_lock(fl); | |
136 | fl->fl_owner = current->files; | |
7bab377f | 137 | fl->fl_pid = (pid_t)lock->svid; |
1da177e4 LT |
138 | fl->fl_flags = FL_POSIX; |
139 | fl->fl_type = F_RDLCK; /* as good as anything else */ | |
140 | start = ntohl(*p++); | |
141 | len = ntohl(*p++); | |
142 | end = start + len - 1; | |
143 | ||
144 | fl->fl_start = s32_to_loff_t(start); | |
145 | ||
146 | if (len == 0 || end < 0) | |
147 | fl->fl_end = OFFSET_MAX; | |
148 | else | |
149 | fl->fl_end = s32_to_loff_t(end); | |
150 | return p; | |
151 | } | |
152 | ||
1da177e4 LT |
153 | /* |
154 | * Encode result of a TEST/TEST_MSG call | |
155 | */ | |
52921e02 AV |
156 | static __be32 * |
157 | nlm_encode_testres(__be32 *p, struct nlm_res *resp) | |
1da177e4 LT |
158 | { |
159 | s32 start, len; | |
160 | ||
161 | if (!(p = nlm_encode_cookie(p, &resp->cookie))) | |
162 | return NULL; | |
163 | *p++ = resp->status; | |
164 | ||
165 | if (resp->status == nlm_lck_denied) { | |
166 | struct file_lock *fl = &resp->lock.fl; | |
167 | ||
168 | *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one; | |
7bab377f | 169 | *p++ = htonl(resp->lock.svid); |
1da177e4 LT |
170 | |
171 | /* Encode owner handle. */ | |
172 | if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) | |
173 | return NULL; | |
174 | ||
175 | start = loff_t_to_s32(fl->fl_start); | |
176 | if (fl->fl_end == OFFSET_MAX) | |
177 | len = 0; | |
178 | else | |
179 | len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1); | |
180 | ||
181 | *p++ = htonl(start); | |
182 | *p++ = htonl(len); | |
183 | } | |
184 | ||
185 | return p; | |
186 | } | |
187 | ||
188 | ||
189 | /* | |
190 | * First, the server side XDR functions | |
191 | */ | |
192 | int | |
52921e02 | 193 | nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
1da177e4 LT |
194 | { |
195 | u32 exclusive; | |
196 | ||
197 | if (!(p = nlm_decode_cookie(p, &argp->cookie))) | |
198 | return 0; | |
199 | ||
200 | exclusive = ntohl(*p++); | |
201 | if (!(p = nlm_decode_lock(p, &argp->lock))) | |
202 | return 0; | |
203 | if (exclusive) | |
204 | argp->lock.fl.fl_type = F_WRLCK; | |
205 | ||
206 | return xdr_argsize_check(rqstp, p); | |
207 | } | |
208 | ||
209 | int | |
52921e02 | 210 | nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
1da177e4 LT |
211 | { |
212 | if (!(p = nlm_encode_testres(p, resp))) | |
213 | return 0; | |
214 | return xdr_ressize_check(rqstp, p); | |
215 | } | |
216 | ||
217 | int | |
52921e02 | 218 | nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
1da177e4 LT |
219 | { |
220 | u32 exclusive; | |
221 | ||
222 | if (!(p = nlm_decode_cookie(p, &argp->cookie))) | |
223 | return 0; | |
224 | argp->block = ntohl(*p++); | |
225 | exclusive = ntohl(*p++); | |
226 | if (!(p = nlm_decode_lock(p, &argp->lock))) | |
227 | return 0; | |
228 | if (exclusive) | |
229 | argp->lock.fl.fl_type = F_WRLCK; | |
230 | argp->reclaim = ntohl(*p++); | |
231 | argp->state = ntohl(*p++); | |
232 | argp->monitor = 1; /* monitor client by default */ | |
233 | ||
234 | return xdr_argsize_check(rqstp, p); | |
235 | } | |
236 | ||
237 | int | |
52921e02 | 238 | nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
1da177e4 LT |
239 | { |
240 | u32 exclusive; | |
241 | ||
242 | if (!(p = nlm_decode_cookie(p, &argp->cookie))) | |
243 | return 0; | |
244 | argp->block = ntohl(*p++); | |
245 | exclusive = ntohl(*p++); | |
246 | if (!(p = nlm_decode_lock(p, &argp->lock))) | |
247 | return 0; | |
248 | if (exclusive) | |
249 | argp->lock.fl.fl_type = F_WRLCK; | |
250 | return xdr_argsize_check(rqstp, p); | |
251 | } | |
252 | ||
253 | int | |
52921e02 | 254 | nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
1da177e4 LT |
255 | { |
256 | if (!(p = nlm_decode_cookie(p, &argp->cookie)) | |
257 | || !(p = nlm_decode_lock(p, &argp->lock))) | |
258 | return 0; | |
259 | argp->lock.fl.fl_type = F_UNLCK; | |
260 | return xdr_argsize_check(rqstp, p); | |
261 | } | |
262 | ||
263 | int | |
52921e02 | 264 | nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp) |
1da177e4 LT |
265 | { |
266 | struct nlm_lock *lock = &argp->lock; | |
267 | ||
268 | memset(lock, 0, sizeof(*lock)); | |
269 | locks_init_lock(&lock->fl); | |
7bab377f TM |
270 | lock->svid = ~(u32) 0; |
271 | lock->fl.fl_pid = (pid_t)lock->svid; | |
1da177e4 LT |
272 | |
273 | if (!(p = nlm_decode_cookie(p, &argp->cookie)) | |
274 | || !(p = xdr_decode_string_inplace(p, &lock->caller, | |
275 | &lock->len, NLM_MAXSTRLEN)) | |
276 | || !(p = nlm_decode_fh(p, &lock->fh)) | |
277 | || !(p = nlm_decode_oh(p, &lock->oh))) | |
278 | return 0; | |
279 | argp->fsm_mode = ntohl(*p++); | |
280 | argp->fsm_access = ntohl(*p++); | |
281 | return xdr_argsize_check(rqstp, p); | |
282 | } | |
283 | ||
284 | int | |
52921e02 | 285 | nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
1da177e4 LT |
286 | { |
287 | if (!(p = nlm_encode_cookie(p, &resp->cookie))) | |
288 | return 0; | |
289 | *p++ = resp->status; | |
290 | *p++ = xdr_zero; /* sequence argument */ | |
291 | return xdr_ressize_check(rqstp, p); | |
292 | } | |
293 | ||
294 | int | |
52921e02 | 295 | nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
1da177e4 LT |
296 | { |
297 | if (!(p = nlm_encode_cookie(p, &resp->cookie))) | |
298 | return 0; | |
299 | *p++ = resp->status; | |
300 | return xdr_ressize_check(rqstp, p); | |
301 | } | |
302 | ||
303 | int | |
52921e02 | 304 | nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp) |
1da177e4 LT |
305 | { |
306 | struct nlm_lock *lock = &argp->lock; | |
307 | ||
308 | if (!(p = xdr_decode_string_inplace(p, &lock->caller, | |
309 | &lock->len, NLM_MAXSTRLEN))) | |
310 | return 0; | |
311 | argp->state = ntohl(*p++); | |
312 | return xdr_argsize_check(rqstp, p); | |
313 | } | |
314 | ||
315 | int | |
52921e02 | 316 | nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp) |
1da177e4 LT |
317 | { |
318 | if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN))) | |
319 | return 0; | |
320 | argp->state = ntohl(*p++); | |
576df463 CL |
321 | memcpy(&argp->priv.data, p, sizeof(argp->priv.data)); |
322 | p += XDR_QUADLEN(SM_PRIV_SIZE); | |
1da177e4 LT |
323 | return xdr_argsize_check(rqstp, p); |
324 | } | |
325 | ||
326 | int | |
52921e02 | 327 | nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
1da177e4 LT |
328 | { |
329 | if (!(p = nlm_decode_cookie(p, &resp->cookie))) | |
330 | return 0; | |
e8c5c045 | 331 | resp->status = *p++; |
1da177e4 LT |
332 | return xdr_argsize_check(rqstp, p); |
333 | } | |
334 | ||
335 | int | |
52921e02 | 336 | nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
337 | { |
338 | return xdr_argsize_check(rqstp, p); | |
339 | } | |
340 | ||
341 | int | |
52921e02 | 342 | nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
343 | { |
344 | return xdr_ressize_check(rqstp, p); | |
345 | } |