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;
36 void nlm4svc_set_file_lock_range(struct file_lock *fl, u64 off, u64 len)
38 s64 end = off + len - 1;
41 if (len == 0 || end < 0)
42 fl->fl_end = OFFSET_MAX;
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.
53 svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
58 if (xdr_stream_decode_u32(xdr, &len) < 0)
60 if (len > NFS_MAXFHSIZE)
63 p = xdr_inline_decode(xdr, len);
67 memcpy(fh->data, p, len);
68 memset(fh->data + len, 0, sizeof(fh->data) - len);
74 svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
76 struct file_lock *fl = &lock->fl;
78 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
80 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
82 if (!svcxdr_decode_owner(xdr, &lock->oh))
84 if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
86 if (xdr_stream_decode_u64(xdr, &lock->lock_start) < 0)
88 if (xdr_stream_decode_u64(xdr, &lock->lock_len) < 0)
92 fl->fl_flags = FL_POSIX;
93 fl->fl_type = F_RDLCK;
94 nlm4svc_set_file_lock_range(fl, lock->lock_start, lock->lock_len);
99 svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
101 const struct file_lock *fl = &lock->fl;
105 if (xdr_stream_encode_bool(xdr, fl->fl_type != F_RDLCK) < 0)
107 if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
109 if (!svcxdr_encode_owner(xdr, &lock->oh))
111 start = loff_t_to_s64(fl->fl_start);
112 if (fl->fl_end == OFFSET_MAX)
115 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
116 if (xdr_stream_encode_u64(xdr, start) < 0)
118 if (xdr_stream_encode_u64(xdr, len) < 0)
125 svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
127 if (!svcxdr_encode_stats(xdr, resp->status))
129 switch (resp->status) {
131 if (!svcxdr_encode_holder(xdr, &resp->lock))
140 * Decode Call arguments
144 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
150 nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
152 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
153 struct nlm_args *argp = rqstp->rq_argp;
156 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
158 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
160 if (!svcxdr_decode_lock(xdr, &argp->lock))
163 argp->lock.fl.fl_type = F_WRLCK;
169 nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
171 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
172 struct nlm_args *argp = rqstp->rq_argp;
175 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
177 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
179 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
181 if (!svcxdr_decode_lock(xdr, &argp->lock))
184 argp->lock.fl.fl_type = F_WRLCK;
185 if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
187 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
189 argp->monitor = 1; /* monitor client by default */
195 nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
197 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
198 struct nlm_args *argp = rqstp->rq_argp;
201 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
203 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
205 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
207 if (!svcxdr_decode_lock(xdr, &argp->lock))
210 argp->lock.fl.fl_type = F_WRLCK;
215 nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
217 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
218 struct nlm_args *argp = rqstp->rq_argp;
220 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
222 if (!svcxdr_decode_lock(xdr, &argp->lock))
224 argp->lock.fl.fl_type = F_UNLCK;
230 nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
232 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
233 struct nlm_res *resp = rqstp->rq_argp;
235 if (!svcxdr_decode_cookie(xdr, &resp->cookie))
237 if (!svcxdr_decode_stats(xdr, &resp->status))
244 nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
246 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
247 struct nlm_reboot *argp = rqstp->rq_argp;
250 if (xdr_stream_decode_u32(xdr, &len) < 0)
252 if (len > SM_MAXSTRLEN)
254 p = xdr_inline_decode(xdr, len);
258 argp->mon = (char *)p;
259 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
261 p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
264 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
270 nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
272 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
273 struct nlm_args *argp = rqstp->rq_argp;
274 struct nlm_lock *lock = &argp->lock;
276 memset(lock, 0, sizeof(*lock));
277 locks_init_lock(&lock->fl);
278 lock->svid = ~(u32)0;
280 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
282 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
284 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
286 if (!svcxdr_decode_owner(xdr, &lock->oh))
288 /* XXX: Range checks are missing in the original code */
289 if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
291 if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
298 nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
300 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
301 struct nlm_args *argp = rqstp->rq_argp;
302 struct nlm_lock *lock = &argp->lock;
304 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
306 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
314 * Encode Reply results
318 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
324 nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
326 struct xdr_stream *xdr = &rqstp->rq_res_stream;
327 struct nlm_res *resp = rqstp->rq_resp;
329 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
330 svcxdr_encode_testrply(xdr, resp);
334 nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
336 struct xdr_stream *xdr = &rqstp->rq_res_stream;
337 struct nlm_res *resp = rqstp->rq_resp;
339 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
340 svcxdr_encode_stats(xdr, resp->status);
344 nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
346 struct xdr_stream *xdr = &rqstp->rq_res_stream;
347 struct nlm_res *resp = rqstp->rq_resp;
349 if (!svcxdr_encode_cookie(xdr, &resp->cookie))
351 if (!svcxdr_encode_stats(xdr, resp->status))
354 if (xdr_stream_encode_u32(xdr, 0) < 0)