Root/fs/lockd/xdr4.c

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
22static inline loff_t
23s64_to_loff_t(__s64 offset)
24{
25    return (loff_t)offset;
26}
27
28
29static inline s64
30loff_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 */
45static __be32 *
46nlm4_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
73static __be32 *
74nlm4_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
82static __be32 *
83nlm4_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 */
99static __be32 *
100nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
101{
102    return xdr_decode_netobj(p, oh);
103}
104
105static __be32 *
106nlm4_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 */
140static __be32 *
141nlm4_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 */
181int
182nlm4svc_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
198int
199nlm4svc_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
206int
207nlm4svc_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
226int
227nlm4svc_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
242int
243nlm4svc_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
252int
253nlm4svc_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
273int
274nlm4svc_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
283int
284nlm4svc_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
292int
293nlm4svc_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
304int
305nlm4svc_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
315int
316nlm4svc_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
324int
325nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
326{
327    return xdr_argsize_check(rqstp, p);
328}
329
330int
331nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
332{
333    return xdr_ressize_check(rqstp, p);
334}
335

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