1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/lockd/xdr4.c
5 * XDR support for lockd and the lock client.
7 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
11 #include <linux/types.h>
12 #include <linux/sched.h>
13 #include <linux/nfs.h>
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>
24 loff_t_to_s64(loff_t offset)
27 if (offset > NLM4_OFFSET_MAX)
28 res = NLM4_OFFSET_MAX;
29 else if (offset < -NLM4_OFFSET_MAX)
30 res = -NLM4_OFFSET_MAX;
37 * NLM file handles are defined by specification to be a variable-length
38 * XDR opaque no longer than 1024 bytes. However, this implementation
39 * limits their length to the size of an NFSv3 file handle.
42 svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
47 if (xdr_stream_decode_u32(xdr, &len) < 0)
49 if (len > NFS_MAXFHSIZE)
52 p = xdr_inline_decode(xdr, len);
56 memcpy(fh->data, p, len);
57 memset(fh->data + len, 0, sizeof(fh->data) - len);
63 svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
65 struct file_lock *fl = &lock->fl;
67 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
69 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
71 if (!svcxdr_decode_owner(xdr, &lock->oh))
73 if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
75 if (xdr_stream_decode_u64(xdr, &lock->lock_start) < 0)
77 if (xdr_stream_decode_u64(xdr, &lock->lock_len) < 0)
81 fl->fl_flags = FL_POSIX;
82 fl->fl_type = F_RDLCK;
88 svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
90 const struct file_lock *fl = &lock->fl;
94 if (xdr_stream_encode_bool(xdr, fl->fl_type != F_RDLCK) < 0)
96 if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
98 if (!svcxdr_encode_owner(xdr, &lock->oh))
100 start = loff_t_to_s64(fl->fl_start);
101 if (fl->fl_end == OFFSET_MAX)
104 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
105 if (xdr_stream_encode_u64(xdr, start) < 0)
107 if (xdr_stream_encode_u64(xdr, len) < 0)
114 svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
116 if (!svcxdr_encode_stats(xdr, resp->status))
118 switch (resp->status) {
120 if (!svcxdr_encode_holder(xdr, &resp->lock))
129 * Decode Call arguments
133 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
139 nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
141 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
142 struct nlm_args *argp = rqstp->rq_argp;
145 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
147 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
149 if (!svcxdr_decode_lock(xdr, &argp->lock))
152 argp->lock.fl.fl_type = F_WRLCK;
158 nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
160 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
161 struct nlm_args *argp = rqstp->rq_argp;
164 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
166 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
168 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
170 if (!svcxdr_decode_lock(xdr, &argp->lock))
173 argp->lock.fl.fl_type = F_WRLCK;
174 if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
176 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
178 argp->monitor = 1; /* monitor client by default */
184 nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
186 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
187 struct nlm_args *argp = rqstp->rq_argp;
190 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
192 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
194 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
196 if (!svcxdr_decode_lock(xdr, &argp->lock))
199 argp->lock.fl.fl_type = F_WRLCK;
204 nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
206 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
207 struct nlm_args *argp = rqstp->rq_argp;
209 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
211 if (!svcxdr_decode_lock(xdr, &argp->lock))
213 argp->lock.fl.fl_type = F_UNLCK;
219 nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
221 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
222 struct nlm_res *resp = rqstp->rq_argp;
224 if (!svcxdr_decode_cookie(xdr, &resp->cookie))
226 if (!svcxdr_decode_stats(xdr, &resp->status))
233 nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
235 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
236 struct nlm_reboot *argp = rqstp->rq_argp;
239 if (xdr_stream_decode_u32(xdr, &len) < 0)
241 if (len > SM_MAXSTRLEN)
243 p = xdr_inline_decode(xdr, len);
247 argp->mon = (char *)p;
248 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
250 p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
253 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
259 nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
261 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
262 struct nlm_args *argp = rqstp->rq_argp;
263 struct nlm_lock *lock = &argp->lock;
265 memset(lock, 0, sizeof(*lock));
266 locks_init_lock(&lock->fl);
267 lock->svid = ~(u32)0;
269 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
271 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
273 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
275 if (!svcxdr_decode_owner(xdr, &lock->oh))
277 /* XXX: Range checks are missing in the original code */
278 if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
280 if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
287 nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
289 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
290 struct nlm_args *argp = rqstp->rq_argp;
291 struct nlm_lock *lock = &argp->lock;
293 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
295 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
303 * Encode Reply results
307 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
313 nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
315 struct xdr_stream *xdr = &rqstp->rq_res_stream;
316 struct nlm_res *resp = rqstp->rq_resp;
318 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
319 svcxdr_encode_testrply(xdr, resp);
323 nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
325 struct xdr_stream *xdr = &rqstp->rq_res_stream;
326 struct nlm_res *resp = rqstp->rq_resp;
328 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
329 svcxdr_encode_stats(xdr, resp->status);
333 nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
335 struct xdr_stream *xdr = &rqstp->rq_res_stream;
336 struct nlm_res *resp = rqstp->rq_resp;
338 if (!svcxdr_encode_cookie(xdr, &resp->cookie))
340 if (!svcxdr_encode_stats(xdr, resp->status))
343 if (xdr_stream_encode_u32(xdr, 0) < 0)