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 #define NLMDBG_FACILITY         NLMDBG_XDR
  20
  21
  22 static inline loff_t
  23 s32_to_loff_t(__s32 offset)
  24 {
  25         return (loff_t)offset;
  26 }
  27
  28 static inline __s32
  29 loff_t_to_s32(loff_t offset)
  30 {
  31         __s32 res;
  32         if (offset >= NLM_OFFSET_MAX)
  33                 res = NLM_OFFSET_MAX;
  34         else if (offset <= -NLM_OFFSET_MAX)
  35                 res = -NLM_OFFSET_MAX;
  36         else
  37                 res = offset;
  38         return res;
  39 }
  40
  41 /*
  42  * XDR functions for basic NLM types
  43  */
  44 static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
  45 {
  46         unsigned int    len;
  47
  48         len = ntohl(*p++);
  49
  50         if(len==0)
  51         {
  52                 c->len=4;
  53                 memset(c->data, 0, 4);  /* hockeypux brain damage */
  54         }
  55         else if(len<=NLM_MAXCOOKIELEN)
  56         {
  57                 c->len=len;
  58                 memcpy(c->data, p, len);
  59                 p+=XDR_QUADLEN(len);
  60         }
  61         else
  62         {
  63                 dprintk("lockd: bad cookie size %d (only cookies under "
  64                         "%d bytes are supported.)\n",
  65                                 len, NLM_MAXCOOKIELEN);
  66                 return NULL;
  67         }
  68         return p;
  69 }
  70
  71 static inline __be32 *
  72 nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
  73 {
  74         *p++ = htonl(c->len);
  75         memcpy(p, c->data, c->len);
  76         p+=XDR_QUADLEN(c->len);
  77         return p;
  78 }
  79
  80 static __be32 *
  81 nlm_decode_fh(__be32 *p, struct nfs_fh *f)
  82 {
  83         unsigned int    len;
  84
  85         if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
  86                 dprintk("lockd: bad fhandle size %d (should be %d)\n",
  87                         len, NFS2_FHSIZE);
  88                 return NULL;
  89         }
  90         f->size = NFS2_FHSIZE;
  91         memset(f->data, 0, sizeof(f->data));
  92         memcpy(f->data, p, NFS2_FHSIZE);
  93         return p + XDR_QUADLEN(NFS2_FHSIZE);
  94 }
  95
  96 static inline __be32 *
  97 nlm_encode_fh(__be32 *p, struct nfs_fh *f)
  98 {
  99         *p++ = htonl(NFS2_FHSIZE);
 100         memcpy(p, f->data, NFS2_FHSIZE);
 101         return p + XDR_QUADLEN(NFS2_FHSIZE);
 102 }
 103
 104 /*
 105  * Encode and decode owner handle
 106  */
 107 static inline __be32 *
 108 nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
 109 {
 110         return xdr_decode_netobj(p, oh);
 111 }
 112
 113 static inline __be32 *
 114 nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
 115 {
 116         return xdr_encode_netobj(p, oh);
 117 }
 118
 119 static __be32 *
 120 nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
 121 {
 122         struct file_lock        *fl = &lock->fl;
 123         s32                     start, len, end;
 124
 125         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 126                                             &lock->len,
 127                                             NLM_MAXSTRLEN))
 128          || !(p = nlm_decode_fh(p, &lock->fh))
 129          || !(p = nlm_decode_oh(p, &lock->oh)))
 130                 return NULL;
 131         lock->svid  = ntohl(*p++);
 132
 133         locks_init_lock(fl);
 134         fl->fl_owner = current->files;
 135         fl->fl_pid   = (pid_t)lock->svid;
 136         fl->fl_flags = FL_POSIX;
 137         fl->fl_type  = F_RDLCK;         /* as good as anything else */
 138         start = ntohl(*p++);
 139         len = ntohl(*p++);
 140         end = start + len - 1;
 141
 142         fl->fl_start = s32_to_loff_t(start);
 143
 144         if (len == 0 || end < 0)
 145                 fl->fl_end = OFFSET_MAX;
 146         else
 147                 fl->fl_end = s32_to_loff_t(end);
 148         return p;
 149 }
 150
 151 /*
 152  * Encode result of a TEST/TEST_MSG call
 153  */
 154 static __be32 *
 155 nlm_encode_testres(__be32 *p, struct nlm_res *resp)
 156 {
 157         s32             start, len;
 158
 159         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 160                 return NULL;
 161         *p++ = resp->status;
 162
 163         if (resp->status == nlm_lck_denied) {
 164                 struct file_lock        *fl = &resp->lock.fl;
 165
 166                 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
 167                 *p++ = htonl(resp->lock.svid);
 168
 169                 /* Encode owner handle. */
 170                 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
 171                         return NULL;
 172
 173                 start = loff_t_to_s32(fl->fl_start);
 174                 if (fl->fl_end == OFFSET_MAX)
 175                         len = 0;
 176                 else
 177                         len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
 178
 179                 *p++ = htonl(start);
 180                 *p++ = htonl(len);
 181         }
 182
 183         return p;
 184 }
 185
 186
 187 /*
 188  * First, the server side XDR functions
 189  */
 190 int
 191 nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 192 {
 193         u32     exclusive;
 194
 195         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 196                 return 0;
 197
 198         exclusive = ntohl(*p++);
 199         if (!(p = nlm_decode_lock(p, &argp->lock)))
 200                 return 0;
 201         if (exclusive)
 202                 argp->lock.fl.fl_type = F_WRLCK;
 203
 204         return xdr_argsize_check(rqstp, p);
 205 }
 206
 207 int
 208 nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 209 {
 210         if (!(p = nlm_encode_testres(p, resp)))
 211                 return 0;
 212         return xdr_ressize_check(rqstp, p);
 213 }
 214
 215 int
 216 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 217 {
 218         u32     exclusive;
 219
 220         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 221                 return 0;
 222         argp->block  = ntohl(*p++);
 223         exclusive    = ntohl(*p++);
 224         if (!(p = nlm_decode_lock(p, &argp->lock)))
 225                 return 0;
 226         if (exclusive)
 227                 argp->lock.fl.fl_type = F_WRLCK;
 228         argp->reclaim = ntohl(*p++);
 229         argp->state   = ntohl(*p++);
 230         argp->monitor = 1;              /* monitor client by default */
 231
 232         return xdr_argsize_check(rqstp, p);
 233 }
 234
 235 int
 236 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 237 {
 238         u32     exclusive;
 239
 240         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 241                 return 0;
 242         argp->block = ntohl(*p++);
 243         exclusive = ntohl(*p++);
 244         if (!(p = nlm_decode_lock(p, &argp->lock)))
 245                 return 0;
 246         if (exclusive)
 247                 argp->lock.fl.fl_type = F_WRLCK;
 248         return xdr_argsize_check(rqstp, p);
 249 }
 250
 251 int
 252 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 253 {
 254         if (!(p = nlm_decode_cookie(p, &argp->cookie))
 255          || !(p = nlm_decode_lock(p, &argp->lock)))
 256                 return 0;
 257         argp->lock.fl.fl_type = F_UNLCK;
 258         return xdr_argsize_check(rqstp, p);
 259 }
 260
 261 int
 262 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 263 {
 264         struct nlm_lock *lock = &argp->lock;
 265
 266         memset(lock, 0, sizeof(*lock));
 267         locks_init_lock(&lock->fl);
 268         lock->svid = ~(u32) 0;
 269         lock->fl.fl_pid = (pid_t)lock->svid;
 270
 271         if (!(p = nlm_decode_cookie(p, &argp->cookie))
 272          || !(p = xdr_decode_string_inplace(p, &lock->caller,
 273                                             &lock->len, NLM_MAXSTRLEN))
 274          || !(p = nlm_decode_fh(p, &lock->fh))
 275          || !(p = nlm_decode_oh(p, &lock->oh)))
 276                 return 0;
 277         argp->fsm_mode = ntohl(*p++);
 278         argp->fsm_access = ntohl(*p++);
 279         return xdr_argsize_check(rqstp, p);
 280 }
 281
 282 int
 283 nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 284 {
 285         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 286                 return 0;
 287         *p++ = resp->status;
 288         *p++ = xdr_zero;                /* sequence argument */
 289         return xdr_ressize_check(rqstp, p);
 290 }
 291
 292 int
 293 nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 294 {
 295         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 296                 return 0;
 297         *p++ = resp->status;
 298         return xdr_ressize_check(rqstp, p);
 299 }
 300
 301 int
 302 nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
 303 {
 304         struct nlm_lock *lock = &argp->lock;
 305
 306         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 307                                             &lock->len, NLM_MAXSTRLEN)))
 308                 return 0;
 309         argp->state = ntohl(*p++);
 310         return xdr_argsize_check(rqstp, p);
 311 }
 312
 313 int
 314 nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
 315 {
 316         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 317                 return 0;
 318         argp->state = ntohl(*p++);
 319         memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
 320         p += XDR_QUADLEN(SM_PRIV_SIZE);
 321         return xdr_argsize_check(rqstp, p);
 322 }
 323
 324 int
 325 nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 326 {
 327         if (!(p = nlm_decode_cookie(p, &resp->cookie)))
 328                 return 0;
 329         resp->status = *p++;
 330         return xdr_argsize_check(rqstp, p);
 331 }
 332
 333 int
 334 nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 335 {
 336         return xdr_argsize_check(rqstp, p);
 337 }
 338
 339 int
 340 nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 341 {
 342         return xdr_ressize_check(rqstp, p);
 343 }