fs/lockd/xdr.c

   1 /*
   2  * linux/fs/lockd/xdr.c
   3  *
   4  * XDR support for lockd and the lock client.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/sched.h>
  11 #include <linux/nfs.h>
  12
  13 #include <linux/sunrpc/xdr.h>
  14 #include <linux/sunrpc/clnt.h>
  15 #include <linux/sunrpc/svc.h>
  16 #include <linux/sunrpc/stats.h>
  17 #include <linux/lockd/lockd.h>
  18
  19 #include <uapi/linux/nfs2.h>
  20
  21 #define NLMDBG_FACILITY         NLMDBG_XDR
  22
  23
  24 static inline loff_t
  25 s32_to_loff_t(__s32 offset)
  26 {
  27         return (loff_t)offset;
  28 }
  29
  30 static inline __s32
  31 loff_t_to_s32(loff_t offset)
  32 {
  33         __s32 res;
  34         if (offset >= NLM_OFFSET_MAX)
  35                 res = NLM_OFFSET_MAX;
  36         else if (offset <= -NLM_OFFSET_MAX)
  37                 res = -NLM_OFFSET_MAX;
  38         else
  39                 res = offset;
  40         return res;
  41 }
  42
  43 /*
  44  * XDR functions for basic NLM types
  45  */
  46 static __be32 *nlm_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 inline __be32 *
  74 nlm_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 *
  83 nlm_decode_fh(__be32 *p, struct nfs_fh *f)
  84 {
  85         unsigned int    len;
  86
  87         if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
  88                 dprintk("lockd: bad fhandle size %d (should be %d)\n",
  89                         len, NFS2_FHSIZE);
  90                 return NULL;
  91         }
  92         f->size = NFS2_FHSIZE;
  93         memset(f->data, 0, sizeof(f->data));
  94         memcpy(f->data, p, NFS2_FHSIZE);
  95         return p + XDR_QUADLEN(NFS2_FHSIZE);
  96 }
  97
  98 static inline __be32 *
  99 nlm_encode_fh(__be32 *p, struct nfs_fh *f)
 100 {
 101         *p++ = htonl(NFS2_FHSIZE);
 102         memcpy(p, f->data, NFS2_FHSIZE);
 103         return p + XDR_QUADLEN(NFS2_FHSIZE);
 104 }
 105
 106 /*
 107  * Encode and decode owner handle
 108  */
 109 static inline __be32 *
 110 nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
 111 {
 112         return xdr_decode_netobj(p, oh);
 113 }
 114
 115 static inline __be32 *
 116 nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
 117 {
 118         return xdr_encode_netobj(p, oh);
 119 }
 120
 121 static __be32 *
 122 nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
 123 {
 124         struct file_lock        *fl = &lock->fl;
 125         s32                     start, len, end;
 126
 127         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 128                                             &lock->len,
 129                                             NLM_MAXSTRLEN))
 130          || !(p = nlm_decode_fh(p, &lock->fh))
 131          || !(p = nlm_decode_oh(p, &lock->oh)))
 132                 return NULL;
 133         lock->svid  = ntohl(*p++);
 134
 135         locks_init_lock(fl);
 136         fl->fl_owner = current->files;
 137         fl->fl_pid   = (pid_t)lock->svid;
 138         fl->fl_flags = FL_POSIX;
 139         fl->fl_type  = F_RDLCK;         /* as good as anything else */
 140         start = ntohl(*p++);
 141         len = ntohl(*p++);
 142         end = start + len - 1;
 143
 144         fl->fl_start = s32_to_loff_t(start);
 145
 146         if (len == 0 || end < 0)
 147                 fl->fl_end = OFFSET_MAX;
 148         else
 149                 fl->fl_end = s32_to_loff_t(end);
 150         return p;
 151 }
 152
 153 /*
 154  * Encode result of a TEST/TEST_MSG call
 155  */
 156 static __be32 *
 157 nlm_encode_testres(__be32 *p, struct nlm_res *resp)
 158 {
 159         s32             start, len;
 160
 161         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 162                 return NULL;
 163         *p++ = resp->status;
 164
 165         if (resp->status == nlm_lck_denied) {
 166                 struct file_lock        *fl = &resp->lock.fl;
 167
 168                 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
 169                 *p++ = htonl(resp->lock.svid);
 170
 171                 /* Encode owner handle. */
 172                 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
 173                         return NULL;
 174
 175                 start = loff_t_to_s32(fl->fl_start);
 176                 if (fl->fl_end == OFFSET_MAX)
 177                         len = 0;
 178                 else
 179                         len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
 180
 181                 *p++ = htonl(start);
 182                 *p++ = htonl(len);
 183         }
 184
 185         return p;
 186 }
 187
 188
 189 /*
 190  * First, the server side XDR functions
 191  */
 192 int
 193 nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 194 {
 195         u32     exclusive;
 196
 197         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 198                 return 0;
 199
 200         exclusive = ntohl(*p++);
 201         if (!(p = nlm_decode_lock(p, &argp->lock)))
 202                 return 0;
 203         if (exclusive)
 204                 argp->lock.fl.fl_type = F_WRLCK;
 205
 206         return xdr_argsize_check(rqstp, p);
 207 }
 208
 209 int
 210 nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 211 {
 212         if (!(p = nlm_encode_testres(p, resp)))
 213                 return 0;
 214         return xdr_ressize_check(rqstp, p);
 215 }
 216
 217 int
 218 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 219 {
 220         u32     exclusive;
 221
 222         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 223                 return 0;
 224         argp->block  = ntohl(*p++);
 225         exclusive    = ntohl(*p++);
 226         if (!(p = nlm_decode_lock(p, &argp->lock)))
 227                 return 0;
 228         if (exclusive)
 229                 argp->lock.fl.fl_type = F_WRLCK;
 230         argp->reclaim = ntohl(*p++);
 231         argp->state   = ntohl(*p++);
 232         argp->monitor = 1;              /* monitor client by default */
 233
 234         return xdr_argsize_check(rqstp, p);
 235 }
 236
 237 int
 238 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 239 {
 240         u32     exclusive;
 241
 242         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 243                 return 0;
 244         argp->block = ntohl(*p++);
 245         exclusive = ntohl(*p++);
 246         if (!(p = nlm_decode_lock(p, &argp->lock)))
 247                 return 0;
 248         if (exclusive)
 249                 argp->lock.fl.fl_type = F_WRLCK;
 250         return xdr_argsize_check(rqstp, p);
 251 }
 252
 253 int
 254 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 255 {
 256         if (!(p = nlm_decode_cookie(p, &argp->cookie))
 257          || !(p = nlm_decode_lock(p, &argp->lock)))
 258                 return 0;
 259         argp->lock.fl.fl_type = F_UNLCK;
 260         return xdr_argsize_check(rqstp, p);
 261 }
 262
 263 int
 264 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 265 {
 266         struct nlm_lock *lock = &argp->lock;
 267
 268         memset(lock, 0, sizeof(*lock));
 269         locks_init_lock(&lock->fl);
 270         lock->svid = ~(u32) 0;
 271         lock->fl.fl_pid = (pid_t)lock->svid;
 272
 273         if (!(p = nlm_decode_cookie(p, &argp->cookie))
 274          || !(p = xdr_decode_string_inplace(p, &lock->caller,
 275                                             &lock->len, NLM_MAXSTRLEN))
 276          || !(p = nlm_decode_fh(p, &lock->fh))
 277          || !(p = nlm_decode_oh(p, &lock->oh)))
 278                 return 0;
 279         argp->fsm_mode = ntohl(*p++);
 280         argp->fsm_access = ntohl(*p++);
 281         return xdr_argsize_check(rqstp, p);
 282 }
 283
 284 int
 285 nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 286 {
 287         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 288                 return 0;
 289         *p++ = resp->status;
 290         *p++ = xdr_zero;                /* sequence argument */
 291         return xdr_ressize_check(rqstp, p);
 292 }
 293
 294 int
 295 nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 296 {
 297         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 298                 return 0;
 299         *p++ = resp->status;
 300         return xdr_ressize_check(rqstp, p);
 301 }
 302
 303 int
 304 nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
 305 {
 306         struct nlm_lock *lock = &argp->lock;
 307
 308         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 309                                             &lock->len, NLM_MAXSTRLEN)))
 310                 return 0;
 311         argp->state = ntohl(*p++);
 312         return xdr_argsize_check(rqstp, p);
 313 }
 314
 315 int
 316 nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
 317 {
 318         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 319                 return 0;
 320         argp->state = ntohl(*p++);
 321         memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
 322         p += XDR_QUADLEN(SM_PRIV_SIZE);
 323         return xdr_argsize_check(rqstp, p);
 324 }
 325
 326 int
 327 nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 328 {
 329         if (!(p = nlm_decode_cookie(p, &resp->cookie)))
 330                 return 0;
 331         resp->status = *p++;
 332         return xdr_argsize_check(rqstp, p);
 333 }
 334
 335 int
 336 nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 337 {
 338         return xdr_argsize_check(rqstp, p);
 339 }
 340
 341 int
 342 nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 343 {
 344         return xdr_ressize_check(rqstp, p);
 345 }