1 /*
2 * linux/fs/lockd/xdr4.c
3 *
4 * XDR support for lockd and the lock client.
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
8 */
9
10 #include <linux/types.h>
11 #include <linux/sched.h>
12 #include <linux/nfs.h>
13
14 #include <linux/sunrpc/xdr.h>
15 #include <linux/sunrpc/clnt.h>
16 #include <linux/sunrpc/svc.h>
17 #include <linux/sunrpc/stats.h>
18 #include <linux/lockd/lockd.h>
19
20 #define NLMDBG_FACILITY NLMDBG_XDR
21
22 static inline loff_t
s64_to_loff_t(__s64 offset)23 s64_to_loff_t(__s64 offset)
24 {
25 return (loff_t)offset;
26 }
27
28
29 static inline s64
loff_t_to_s64(loff_t offset)30 loff_t_to_s64(loff_t offset)
31 {
32 s64 res;
33 if (offset > NLM4_OFFSET_MAX)
34 res = NLM4_OFFSET_MAX;
35 else if (offset < -NLM4_OFFSET_MAX)
36 res = -NLM4_OFFSET_MAX;
37 else
38 res = offset;
39 return res;
40 }
41
42 /*
43 * XDR functions for basic NLM types
44 */
45 static __be32 *
nlm4_decode_cookie(__be32 * p,struct nlm_cookie * c)46 nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
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 {
65 dprintk("lockd: bad cookie size %d (only cookies under "
66 "%d bytes are supported.)\n",
67 len, NLM_MAXCOOKIELEN);
68 return NULL;
69 }
70 return p;
71 }
72
73 static __be32 *
nlm4_encode_cookie(__be32 * p,struct nlm_cookie * c)74 nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
75 {
76 *p++ = htonl(c->len);
77 memcpy(p, c->data, c->len);
78 p+=XDR_QUADLEN(c->len);
79 return p;
80 }
81
82 static __be32 *
nlm4_decode_fh(__be32 * p,struct nfs_fh * f)83 nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
84 {
85 memset(f->data, 0, sizeof(f->data));
86 f->size = ntohl(*p++);
87 if (f->size > NFS_MAXFHSIZE) {
88 dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
89 f->size, NFS_MAXFHSIZE);
90 return NULL;
91 }
92 memcpy(f->data, p, f->size);
93 return p + XDR_QUADLEN(f->size);
94 }
95
96 /*
97 * Encode and decode owner handle
98 */
99 static __be32 *
nlm4_decode_oh(__be32 * p,struct xdr_netobj * oh)100 nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
101 {
102 return xdr_decode_netobj(p, oh);
103 }
104
105 static __be32 *
nlm4_decode_lock(__be32 * p,struct nlm_lock * lock)106 nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
107 {
108 struct file_lock *fl = &lock->fl;
109 __u64 len, start;
110 __s64 end;
111
112 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
113 &lock->len, NLM_MAXSTRLEN))
114 || !(p = nlm4_decode_fh(p, &lock->fh))
115 || !(p = nlm4_decode_oh(p, &lock->oh)))
116 return NULL;
117 lock->svid = ntohl(*p++);
118
119 locks_init_lock(fl);
120 fl->fl_owner = current->files;
121 fl->fl_pid = (pid_t)lock->svid;
122 fl->fl_flags = FL_POSIX;
123 fl->fl_type = F_RDLCK; /* as good as anything else */
124 p = xdr_decode_hyper(p, &start);
125 p = xdr_decode_hyper(p, &len);
126 end = start + len - 1;
127
128 fl->fl_start = s64_to_loff_t(start);
129
130 if (len == 0 || end < 0)
131 fl->fl_end = OFFSET_MAX;
132 else
133 fl->fl_end = s64_to_loff_t(end);
134 return p;
135 }
136
137 /*
138 * Encode result of a TEST/TEST_MSG call
139 */
140 static __be32 *
nlm4_encode_testres(__be32 * p,struct nlm_res * resp)141 nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
142 {
143 s64 start, len;
144
145 dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
146 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
147 return NULL;
148 *p++ = resp->status;
149
150 if (resp->status == nlm_lck_denied) {
151 struct file_lock *fl = &resp->lock.fl;
152
153 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
154 *p++ = htonl(resp->lock.svid);
155
156 /* Encode owner handle. */
157 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
158 return NULL;
159
160 start = loff_t_to_s64(fl->fl_start);
161 if (fl->fl_end == OFFSET_MAX)
162 len = 0;
163 else
164 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
165
166 p = xdr_encode_hyper(p, start);
167 p = xdr_encode_hyper(p, len);
168 dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
169 resp->status, (int)resp->lock.svid, fl->fl_type,
170 (long long)fl->fl_start, (long long)fl->fl_end);
171 }
172
173 dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
174 return p;
175 }
176
177
178 /*
179 * First, the server side XDR functions
180 */
181 int
nlm4svc_decode_testargs(struct svc_rqst * rqstp,__be32 * p,nlm_args * argp)182 nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
183 {
184 u32 exclusive;
185
186 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
187 return 0;
188
189 exclusive = ntohl(*p++);
190 if (!(p = nlm4_decode_lock(p, &argp->lock)))
191 return 0;
192 if (exclusive)
193 argp->lock.fl.fl_type = F_WRLCK;
194
195 return xdr_argsize_check(rqstp, p);
196 }
197
198 int
nlm4svc_encode_testres(struct svc_rqst * rqstp,__be32 * p,struct nlm_res * resp)199 nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
200 {
201 if (!(p = nlm4_encode_testres(p, resp)))
202 return 0;
203 return xdr_ressize_check(rqstp, p);
204 }
205
206 int
nlm4svc_decode_lockargs(struct svc_rqst * rqstp,__be32 * p,nlm_args * argp)207 nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
208 {
209 u32 exclusive;
210
211 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
212 return 0;
213 argp->block = ntohl(*p++);
214 exclusive = ntohl(*p++);
215 if (!(p = nlm4_decode_lock(p, &argp->lock)))
216 return 0;
217 if (exclusive)
218 argp->lock.fl.fl_type = F_WRLCK;
219 argp->reclaim = ntohl(*p++);
220 argp->state = ntohl(*p++);
221 argp->monitor = 1; /* monitor client by default */
222
223 return xdr_argsize_check(rqstp, p);
224 }
225
226 int
nlm4svc_decode_cancargs(struct svc_rqst * rqstp,__be32 * p,nlm_args * argp)227 nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
228 {
229 u32 exclusive;
230
231 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
232 return 0;
233 argp->block = ntohl(*p++);
234 exclusive = ntohl(*p++);
235 if (!(p = nlm4_decode_lock(p, &argp->lock)))
236 return 0;
237 if (exclusive)
238 argp->lock.fl.fl_type = F_WRLCK;
239 return xdr_argsize_check(rqstp, p);
240 }
241
242 int
nlm4svc_decode_unlockargs(struct svc_rqst * rqstp,__be32 * p,nlm_args * argp)243 nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
244 {
245 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
246 || !(p = nlm4_decode_lock(p, &argp->lock)))
247 return 0;
248 argp->lock.fl.fl_type = F_UNLCK;
249 return xdr_argsize_check(rqstp, p);
250 }
251
252 int
nlm4svc_decode_shareargs(struct svc_rqst * rqstp,__be32 * p,nlm_args * argp)253 nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
254 {
255 struct nlm_lock *lock = &argp->lock;
256
257 memset(lock, 0, sizeof(*lock));
258 locks_init_lock(&lock->fl);
259 lock->svid = ~(u32) 0;
260 lock->fl.fl_pid = (pid_t)lock->svid;
261
262 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
263 || !(p = xdr_decode_string_inplace(p, &lock->caller,
264 &lock->len, NLM_MAXSTRLEN))
265 || !(p = nlm4_decode_fh(p, &lock->fh))
266 || !(p = nlm4_decode_oh(p, &lock->oh)))
267 return 0;
268 argp->fsm_mode = ntohl(*p++);
269 argp->fsm_access = ntohl(*p++);
270 return xdr_argsize_check(rqstp, p);
271 }
272
273 int
nlm4svc_encode_shareres(struct svc_rqst * rqstp,__be32 * p,struct nlm_res * resp)274 nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
275 {
276 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
277 return 0;
278 *p++ = resp->status;
279 *p++ = xdr_zero; /* sequence argument */
280 return xdr_ressize_check(rqstp, p);
281 }
282
283 int
nlm4svc_encode_res(struct svc_rqst * rqstp,__be32 * p,struct nlm_res * resp)284 nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
285 {
286 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
287 return 0;
288 *p++ = resp->status;
289 return xdr_ressize_check(rqstp, p);
290 }
291
292 int
nlm4svc_decode_notify(struct svc_rqst * rqstp,__be32 * p,struct nlm_args * argp)293 nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
294 {
295 struct nlm_lock *lock = &argp->lock;
296
297 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
298 &lock->len, NLM_MAXSTRLEN)))
299 return 0;
300 argp->state = ntohl(*p++);
301 return xdr_argsize_check(rqstp, p);
302 }
303
304 int
nlm4svc_decode_reboot(struct svc_rqst * rqstp,__be32 * p,struct nlm_reboot * argp)305 nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
306 {
307 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
308 return 0;
309 argp->state = ntohl(*p++);
310 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
311 p += XDR_QUADLEN(SM_PRIV_SIZE);
312 return xdr_argsize_check(rqstp, p);
313 }
314
315 int
nlm4svc_decode_res(struct svc_rqst * rqstp,__be32 * p,struct nlm_res * resp)316 nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
317 {
318 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
319 return 0;
320 resp->status = *p++;
321 return xdr_argsize_check(rqstp, p);
322 }
323
324 int
nlm4svc_decode_void(struct svc_rqst * rqstp,__be32 * p,void * dummy)325 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
326 {
327 return xdr_argsize_check(rqstp, p);
328 }
329
330 int
nlm4svc_encode_void(struct svc_rqst * rqstp,__be32 * p,void * dummy)331 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
332 {
333 return xdr_ressize_check(rqstp, p);
334 }
335