1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * linux/fs/lockd/xdr4.c |
4 | * |
5 | * XDR support for lockd and the lock client. |
6 | * |
7 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> |
8 | * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no> |
9 | */ |
10 | |
11 | #include <linux/types.h> |
12 | #include <linux/sched.h> |
13 | #include <linux/nfs.h> |
14 | |
15 | #include <linux/sunrpc/xdr.h> |
16 | #include <linux/sunrpc/clnt.h> |
17 | #include <linux/sunrpc/svc.h> |
18 | #include <linux/sunrpc/stats.h> |
19 | #include <linux/lockd/lockd.h> |
20 | |
21 | #include "svcxdr.h" |
22 | |
23 | static inline s64 |
24 | loff_t_to_s64(loff_t offset) |
25 | { |
26 | s64 res; |
27 | if (offset > NLM4_OFFSET_MAX) |
28 | res = NLM4_OFFSET_MAX; |
29 | else if (offset < -NLM4_OFFSET_MAX) |
30 | res = -NLM4_OFFSET_MAX; |
31 | else |
32 | res = offset; |
33 | return res; |
34 | } |
35 | |
36 | void nlm4svc_set_file_lock_range(struct file_lock *fl, u64 off, u64 len) |
37 | { |
38 | s64 end = off + len - 1; |
39 | |
40 | fl->fl_start = off; |
41 | if (len == 0 || end < 0) |
42 | fl->fl_end = OFFSET_MAX; |
43 | else |
44 | fl->fl_end = end; |
45 | } |
46 | |
47 | /* |
48 | * NLM file handles are defined by specification to be a variable-length |
49 | * XDR opaque no longer than 1024 bytes. However, this implementation |
50 | * limits their length to the size of an NFSv3 file handle. |
51 | */ |
52 | static bool |
53 | svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh) |
54 | { |
55 | __be32 *p; |
56 | u32 len; |
57 | |
58 | if (xdr_stream_decode_u32(xdr, ptr: &len) < 0) |
59 | return false; |
60 | if (len > NFS_MAXFHSIZE) |
61 | return false; |
62 | |
63 | p = xdr_inline_decode(xdr, nbytes: len); |
64 | if (!p) |
65 | return false; |
66 | fh->size = len; |
67 | memcpy(fh->data, p, len); |
68 | memset(fh->data + len, 0, sizeof(fh->data) - len); |
69 | |
70 | return true; |
71 | } |
72 | |
73 | static bool |
74 | svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock) |
75 | { |
76 | struct file_lock *fl = &lock->fl; |
77 | |
78 | if (!svcxdr_decode_string(xdr, data: &lock->caller, data_len: &lock->len)) |
79 | return false; |
80 | if (!svcxdr_decode_fhandle(xdr, fh: &lock->fh)) |
81 | return false; |
82 | if (!svcxdr_decode_owner(xdr, obj: &lock->oh)) |
83 | return false; |
84 | if (xdr_stream_decode_u32(xdr, ptr: &lock->svid) < 0) |
85 | return false; |
86 | if (xdr_stream_decode_u64(xdr, ptr: &lock->lock_start) < 0) |
87 | return false; |
88 | if (xdr_stream_decode_u64(xdr, ptr: &lock->lock_len) < 0) |
89 | return false; |
90 | |
91 | locks_init_lock(fl); |
92 | fl->fl_flags = FL_POSIX; |
93 | fl->fl_type = F_RDLCK; |
94 | nlm4svc_set_file_lock_range(fl, off: lock->lock_start, len: lock->lock_len); |
95 | return true; |
96 | } |
97 | |
98 | static bool |
99 | svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock) |
100 | { |
101 | const struct file_lock *fl = &lock->fl; |
102 | s64 start, len; |
103 | |
104 | /* exclusive */ |
105 | if (xdr_stream_encode_bool(xdr, n: fl->fl_type != F_RDLCK) < 0) |
106 | return false; |
107 | if (xdr_stream_encode_u32(xdr, n: lock->svid) < 0) |
108 | return false; |
109 | if (!svcxdr_encode_owner(xdr, obj: &lock->oh)) |
110 | return false; |
111 | start = loff_t_to_s64(offset: fl->fl_start); |
112 | if (fl->fl_end == OFFSET_MAX) |
113 | len = 0; |
114 | else |
115 | len = loff_t_to_s64(offset: fl->fl_end - fl->fl_start + 1); |
116 | if (xdr_stream_encode_u64(xdr, n: start) < 0) |
117 | return false; |
118 | if (xdr_stream_encode_u64(xdr, n: len) < 0) |
119 | return false; |
120 | |
121 | return true; |
122 | } |
123 | |
124 | static bool |
125 | svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp) |
126 | { |
127 | if (!svcxdr_encode_stats(xdr, status: resp->status)) |
128 | return false; |
129 | switch (resp->status) { |
130 | case nlm_lck_denied: |
131 | if (!svcxdr_encode_holder(xdr, lock: &resp->lock)) |
132 | return false; |
133 | } |
134 | |
135 | return true; |
136 | } |
137 | |
138 | |
139 | /* |
140 | * Decode Call arguments |
141 | */ |
142 | |
143 | bool |
144 | nlm4svc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
145 | { |
146 | return true; |
147 | } |
148 | |
149 | bool |
150 | nlm4svc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
151 | { |
152 | struct nlm_args *argp = rqstp->rq_argp; |
153 | u32 exclusive; |
154 | |
155 | if (!svcxdr_decode_cookie(xdr, cookie: &argp->cookie)) |
156 | return false; |
157 | if (xdr_stream_decode_bool(xdr, ptr: &exclusive) < 0) |
158 | return false; |
159 | if (!svcxdr_decode_lock(xdr, lock: &argp->lock)) |
160 | return false; |
161 | if (exclusive) |
162 | argp->lock.fl.fl_type = F_WRLCK; |
163 | |
164 | return true; |
165 | } |
166 | |
167 | bool |
168 | nlm4svc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
169 | { |
170 | struct nlm_args *argp = rqstp->rq_argp; |
171 | u32 exclusive; |
172 | |
173 | if (!svcxdr_decode_cookie(xdr, cookie: &argp->cookie)) |
174 | return false; |
175 | if (xdr_stream_decode_bool(xdr, ptr: &argp->block) < 0) |
176 | return false; |
177 | if (xdr_stream_decode_bool(xdr, ptr: &exclusive) < 0) |
178 | return false; |
179 | if (!svcxdr_decode_lock(xdr, lock: &argp->lock)) |
180 | return false; |
181 | if (exclusive) |
182 | argp->lock.fl.fl_type = F_WRLCK; |
183 | if (xdr_stream_decode_bool(xdr, ptr: &argp->reclaim) < 0) |
184 | return false; |
185 | if (xdr_stream_decode_u32(xdr, ptr: &argp->state) < 0) |
186 | return false; |
187 | argp->monitor = 1; /* monitor client by default */ |
188 | |
189 | return true; |
190 | } |
191 | |
192 | bool |
193 | nlm4svc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
194 | { |
195 | struct nlm_args *argp = rqstp->rq_argp; |
196 | u32 exclusive; |
197 | |
198 | if (!svcxdr_decode_cookie(xdr, cookie: &argp->cookie)) |
199 | return false; |
200 | if (xdr_stream_decode_bool(xdr, ptr: &argp->block) < 0) |
201 | return false; |
202 | if (xdr_stream_decode_bool(xdr, ptr: &exclusive) < 0) |
203 | return false; |
204 | if (!svcxdr_decode_lock(xdr, lock: &argp->lock)) |
205 | return false; |
206 | if (exclusive) |
207 | argp->lock.fl.fl_type = F_WRLCK; |
208 | |
209 | return true; |
210 | } |
211 | |
212 | bool |
213 | nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
214 | { |
215 | struct nlm_args *argp = rqstp->rq_argp; |
216 | |
217 | if (!svcxdr_decode_cookie(xdr, cookie: &argp->cookie)) |
218 | return false; |
219 | if (!svcxdr_decode_lock(xdr, lock: &argp->lock)) |
220 | return false; |
221 | argp->lock.fl.fl_type = F_UNLCK; |
222 | |
223 | return true; |
224 | } |
225 | |
226 | bool |
227 | nlm4svc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
228 | { |
229 | struct nlm_res *resp = rqstp->rq_argp; |
230 | |
231 | if (!svcxdr_decode_cookie(xdr, cookie: &resp->cookie)) |
232 | return false; |
233 | if (!svcxdr_decode_stats(xdr, status: &resp->status)) |
234 | return false; |
235 | |
236 | return true; |
237 | } |
238 | |
239 | bool |
240 | nlm4svc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
241 | { |
242 | struct nlm_reboot *argp = rqstp->rq_argp; |
243 | __be32 *p; |
244 | u32 len; |
245 | |
246 | if (xdr_stream_decode_u32(xdr, ptr: &len) < 0) |
247 | return false; |
248 | if (len > SM_MAXSTRLEN) |
249 | return false; |
250 | p = xdr_inline_decode(xdr, nbytes: len); |
251 | if (!p) |
252 | return false; |
253 | argp->len = len; |
254 | argp->mon = (char *)p; |
255 | if (xdr_stream_decode_u32(xdr, ptr: &argp->state) < 0) |
256 | return false; |
257 | p = xdr_inline_decode(xdr, SM_PRIV_SIZE); |
258 | if (!p) |
259 | return false; |
260 | memcpy(&argp->priv.data, p, sizeof(argp->priv.data)); |
261 | |
262 | return true; |
263 | } |
264 | |
265 | bool |
266 | nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
267 | { |
268 | struct nlm_args *argp = rqstp->rq_argp; |
269 | struct nlm_lock *lock = &argp->lock; |
270 | |
271 | memset(lock, 0, sizeof(*lock)); |
272 | locks_init_lock(&lock->fl); |
273 | lock->svid = ~(u32)0; |
274 | |
275 | if (!svcxdr_decode_cookie(xdr, cookie: &argp->cookie)) |
276 | return false; |
277 | if (!svcxdr_decode_string(xdr, data: &lock->caller, data_len: &lock->len)) |
278 | return false; |
279 | if (!svcxdr_decode_fhandle(xdr, fh: &lock->fh)) |
280 | return false; |
281 | if (!svcxdr_decode_owner(xdr, obj: &lock->oh)) |
282 | return false; |
283 | /* XXX: Range checks are missing in the original code */ |
284 | if (xdr_stream_decode_u32(xdr, ptr: &argp->fsm_mode) < 0) |
285 | return false; |
286 | if (xdr_stream_decode_u32(xdr, ptr: &argp->fsm_access) < 0) |
287 | return false; |
288 | |
289 | return true; |
290 | } |
291 | |
292 | bool |
293 | nlm4svc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
294 | { |
295 | struct nlm_args *argp = rqstp->rq_argp; |
296 | struct nlm_lock *lock = &argp->lock; |
297 | |
298 | if (!svcxdr_decode_string(xdr, data: &lock->caller, data_len: &lock->len)) |
299 | return false; |
300 | if (xdr_stream_decode_u32(xdr, ptr: &argp->state) < 0) |
301 | return false; |
302 | |
303 | return true; |
304 | } |
305 | |
306 | |
307 | /* |
308 | * Encode Reply results |
309 | */ |
310 | |
311 | bool |
312 | nlm4svc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
313 | { |
314 | return true; |
315 | } |
316 | |
317 | bool |
318 | nlm4svc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
319 | { |
320 | struct nlm_res *resp = rqstp->rq_resp; |
321 | |
322 | return svcxdr_encode_cookie(xdr, cookie: &resp->cookie) && |
323 | svcxdr_encode_testrply(xdr, resp); |
324 | } |
325 | |
326 | bool |
327 | nlm4svc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
328 | { |
329 | struct nlm_res *resp = rqstp->rq_resp; |
330 | |
331 | return svcxdr_encode_cookie(xdr, cookie: &resp->cookie) && |
332 | svcxdr_encode_stats(xdr, status: resp->status); |
333 | } |
334 | |
335 | bool |
336 | nlm4svc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr) |
337 | { |
338 | struct nlm_res *resp = rqstp->rq_resp; |
339 | |
340 | if (!svcxdr_encode_cookie(xdr, cookie: &resp->cookie)) |
341 | return false; |
342 | if (!svcxdr_encode_stats(xdr, status: resp->status)) |
343 | return false; |
344 | /* sequence */ |
345 | if (xdr_stream_encode_u32(xdr, n: 0) < 0) |
346 | return false; |
347 | |
348 | return true; |
349 | } |
350 | |