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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 | ||
1da177e4 LT |
98 | /* |
99 | * Encode and decode owner handle | |
100 | */ | |
52921e02 AV |
101 | static inline __be32 * |
102 | nlm_decode_oh(__be32 *p, struct xdr_netobj *oh) | |
1da177e4 LT |
103 | { |
104 | return xdr_decode_netobj(p, oh); | |
105 | } | |
106 | ||
52921e02 AV |
107 | static inline __be32 * |
108 | nlm_encode_oh(__be32 *p, struct xdr_netobj *oh) | |
1da177e4 LT |
109 | { |
110 | return xdr_encode_netobj(p, oh); | |
111 | } | |
112 | ||
52921e02 AV |
113 | static __be32 * |
114 | nlm_decode_lock(__be32 *p, struct nlm_lock *lock) | |
1da177e4 LT |
115 | { |
116 | struct file_lock *fl = &lock->fl; | |
117 | s32 start, len, end; | |
118 | ||
119 | if (!(p = xdr_decode_string_inplace(p, &lock->caller, | |
120 | &lock->len, | |
121 | NLM_MAXSTRLEN)) | |
122 | || !(p = nlm_decode_fh(p, &lock->fh)) | |
123 | || !(p = nlm_decode_oh(p, &lock->oh))) | |
124 | return NULL; | |
7bab377f | 125 | lock->svid = ntohl(*p++); |
1da177e4 LT |
126 | |
127 | locks_init_lock(fl); | |
128 | fl->fl_owner = current->files; | |
7bab377f | 129 | fl->fl_pid = (pid_t)lock->svid; |
1da177e4 LT |
130 | fl->fl_flags = FL_POSIX; |
131 | fl->fl_type = F_RDLCK; /* as good as anything else */ | |
132 | start = ntohl(*p++); | |
133 | len = ntohl(*p++); | |
134 | end = start + len - 1; | |
135 | ||
136 | fl->fl_start = s32_to_loff_t(start); | |
137 | ||
138 | if (len == 0 || end < 0) | |
139 | fl->fl_end = OFFSET_MAX; | |
140 | else | |
141 | fl->fl_end = s32_to_loff_t(end); | |
142 | return p; | |
143 | } | |
144 | ||
1da177e4 LT |
145 | /* |
146 | * Encode result of a TEST/TEST_MSG call | |
147 | */ | |
52921e02 AV |
148 | static __be32 * |
149 | nlm_encode_testres(__be32 *p, struct nlm_res *resp) | |
1da177e4 LT |
150 | { |
151 | s32 start, len; | |
152 | ||
153 | if (!(p = nlm_encode_cookie(p, &resp->cookie))) | |
154 | return NULL; | |
155 | *p++ = resp->status; | |
156 | ||
157 | if (resp->status == nlm_lck_denied) { | |
158 | struct file_lock *fl = &resp->lock.fl; | |
159 | ||
160 | *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one; | |
7bab377f | 161 | *p++ = htonl(resp->lock.svid); |
1da177e4 LT |
162 | |
163 | /* Encode owner handle. */ | |
164 | if (!(p = xdr_encode_netobj(p, &resp->lock.oh))) | |
165 | return NULL; | |
166 | ||
167 | start = loff_t_to_s32(fl->fl_start); | |
168 | if (fl->fl_end == OFFSET_MAX) | |
169 | len = 0; | |
170 | else | |
171 | len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1); | |
172 | ||
173 | *p++ = htonl(start); | |
174 | *p++ = htonl(len); | |
175 | } | |
176 | ||
177 | return p; | |
178 | } | |
179 | ||
180 | ||
181 | /* | |
182 | * First, the server side XDR functions | |
183 | */ | |
184 | int | |
026fec7e | 185 | nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 186 | { |
026fec7e | 187 | struct nlm_args *argp = rqstp->rq_argp; |
1da177e4 LT |
188 | u32 exclusive; |
189 | ||
190 | if (!(p = nlm_decode_cookie(p, &argp->cookie))) | |
191 | return 0; | |
192 | ||
193 | exclusive = ntohl(*p++); | |
194 | if (!(p = nlm_decode_lock(p, &argp->lock))) | |
195 | return 0; | |
196 | if (exclusive) | |
197 | argp->lock.fl.fl_type = F_WRLCK; | |
198 | ||
199 | return xdr_argsize_check(rqstp, p); | |
200 | } | |
201 | ||
202 | int | |
52921e02 | 203 | nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
1da177e4 LT |
204 | { |
205 | if (!(p = nlm_encode_testres(p, resp))) | |
206 | return 0; | |
207 | return xdr_ressize_check(rqstp, p); | |
208 | } | |
209 | ||
210 | int | |
026fec7e | 211 | nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 212 | { |
026fec7e | 213 | struct nlm_args *argp = rqstp->rq_argp; |
1da177e4 LT |
214 | u32 exclusive; |
215 | ||
216 | if (!(p = nlm_decode_cookie(p, &argp->cookie))) | |
217 | return 0; | |
218 | argp->block = ntohl(*p++); | |
219 | exclusive = ntohl(*p++); | |
220 | if (!(p = nlm_decode_lock(p, &argp->lock))) | |
221 | return 0; | |
222 | if (exclusive) | |
223 | argp->lock.fl.fl_type = F_WRLCK; | |
224 | argp->reclaim = ntohl(*p++); | |
225 | argp->state = ntohl(*p++); | |
226 | argp->monitor = 1; /* monitor client by default */ | |
227 | ||
228 | return xdr_argsize_check(rqstp, p); | |
229 | } | |
230 | ||
231 | int | |
026fec7e | 232 | nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 233 | { |
026fec7e | 234 | struct nlm_args *argp = rqstp->rq_argp; |
1da177e4 LT |
235 | u32 exclusive; |
236 | ||
237 | if (!(p = nlm_decode_cookie(p, &argp->cookie))) | |
238 | return 0; | |
239 | argp->block = ntohl(*p++); | |
240 | exclusive = ntohl(*p++); | |
241 | if (!(p = nlm_decode_lock(p, &argp->lock))) | |
242 | return 0; | |
243 | if (exclusive) | |
244 | argp->lock.fl.fl_type = F_WRLCK; | |
245 | return xdr_argsize_check(rqstp, p); | |
246 | } | |
247 | ||
248 | int | |
026fec7e | 249 | nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 250 | { |
026fec7e CH |
251 | struct nlm_args *argp = rqstp->rq_argp; |
252 | ||
1da177e4 LT |
253 | if (!(p = nlm_decode_cookie(p, &argp->cookie)) |
254 | || !(p = nlm_decode_lock(p, &argp->lock))) | |
255 | return 0; | |
256 | argp->lock.fl.fl_type = F_UNLCK; | |
257 | return xdr_argsize_check(rqstp, p); | |
258 | } | |
259 | ||
260 | int | |
026fec7e | 261 | nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 262 | { |
026fec7e | 263 | struct nlm_args *argp = rqstp->rq_argp; |
1da177e4 LT |
264 | struct nlm_lock *lock = &argp->lock; |
265 | ||
266 | memset(lock, 0, sizeof(*lock)); | |
267 | locks_init_lock(&lock->fl); | |
7bab377f TM |
268 | lock->svid = ~(u32) 0; |
269 | lock->fl.fl_pid = (pid_t)lock->svid; | |
1da177e4 LT |
270 | |
271 | if (!(p = nlm_decode_cookie(p, &argp->cookie)) | |
272 | || !(p = xdr_decode_string_inplace(p, &lock->caller, | |
273 | &lock->len, NLM_MAXSTRLEN)) | |
274 | || !(p = nlm_decode_fh(p, &lock->fh)) | |
275 | || !(p = nlm_decode_oh(p, &lock->oh))) | |
276 | return 0; | |
277 | argp->fsm_mode = ntohl(*p++); | |
278 | argp->fsm_access = ntohl(*p++); | |
279 | return xdr_argsize_check(rqstp, p); | |
280 | } | |
281 | ||
282 | int | |
52921e02 | 283 | nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
1da177e4 LT |
284 | { |
285 | if (!(p = nlm_encode_cookie(p, &resp->cookie))) | |
286 | return 0; | |
287 | *p++ = resp->status; | |
288 | *p++ = xdr_zero; /* sequence argument */ | |
289 | return xdr_ressize_check(rqstp, p); | |
290 | } | |
291 | ||
292 | int | |
52921e02 | 293 | nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp) |
1da177e4 LT |
294 | { |
295 | if (!(p = nlm_encode_cookie(p, &resp->cookie))) | |
296 | return 0; | |
297 | *p++ = resp->status; | |
298 | return xdr_ressize_check(rqstp, p); | |
299 | } | |
300 | ||
301 | int | |
026fec7e | 302 | nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 303 | { |
026fec7e | 304 | struct nlm_args *argp = rqstp->rq_argp; |
1da177e4 LT |
305 | struct nlm_lock *lock = &argp->lock; |
306 | ||
307 | if (!(p = xdr_decode_string_inplace(p, &lock->caller, | |
308 | &lock->len, NLM_MAXSTRLEN))) | |
309 | return 0; | |
310 | argp->state = ntohl(*p++); | |
311 | return xdr_argsize_check(rqstp, p); | |
312 | } | |
313 | ||
314 | int | |
026fec7e | 315 | nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 316 | { |
026fec7e CH |
317 | struct nlm_reboot *argp = rqstp->rq_argp; |
318 | ||
1da177e4 LT |
319 | if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN))) |
320 | return 0; | |
321 | argp->state = ntohl(*p++); | |
576df463 CL |
322 | memcpy(&argp->priv.data, p, sizeof(argp->priv.data)); |
323 | p += XDR_QUADLEN(SM_PRIV_SIZE); | |
1da177e4 LT |
324 | return xdr_argsize_check(rqstp, p); |
325 | } | |
326 | ||
327 | int | |
026fec7e | 328 | nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 | 329 | { |
026fec7e CH |
330 | struct nlm_res *resp = rqstp->rq_argp; |
331 | ||
1da177e4 LT |
332 | if (!(p = nlm_decode_cookie(p, &resp->cookie))) |
333 | return 0; | |
e8c5c045 | 334 | resp->status = *p++; |
1da177e4 LT |
335 | return xdr_argsize_check(rqstp, p); |
336 | } | |
337 | ||
338 | int | |
026fec7e | 339 | nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p) |
1da177e4 LT |
340 | { |
341 | return xdr_argsize_check(rqstp, p); | |
342 | } | |
343 | ||
344 | int | |
52921e02 | 345 | nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) |
1da177e4 LT |
346 | { |
347 | return xdr_ressize_check(rqstp, p); | |
348 | } |