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 /*
  99  * Encode and decode owner handle
 100  */
 101 static inline __be32 *
 102 nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
 103 {
 104         return xdr_decode_netobj(p, oh);
 105 }
 106
 107 static inline __be32 *
 108 nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
 109 {
 110         return xdr_encode_netobj(p, oh);
 111 }
 112
 113 static __be32 *
 114 nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
 115 {
 116         struct file_lock        *fl = &lock->fl;
 117         s32                     start, len, end;
 118
 119         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 120                                             &lock->len,
 121                                             NLM_MAXSTRLEN))
 122          || !(p = nlm_decode_fh(p, &lock->fh))
 123          || !(p = nlm_decode_oh(p, &lock->oh)))
 124                 return NULL;
 125         lock->svid  = ntohl(*p++);
 126
 127         locks_init_lock(fl);
 128         fl->fl_owner = current->files;
 129         fl->fl_pid   = (pid_t)lock->svid;
 130         fl->fl_flags = FL_POSIX;
 131         fl->fl_type  = F_RDLCK;         /* as good as anything else */
 132         start = ntohl(*p++);
 133         len = ntohl(*p++);
 134         end = start + len - 1;
 135
 136         fl->fl_start = s32_to_loff_t(start);
 137
 138         if (len == 0 || end < 0)
 139                 fl->fl_end = OFFSET_MAX;
 140         else
 141                 fl->fl_end = s32_to_loff_t(end);
 142         return p;
 143 }
 144
 145 /*
 146  * Encode result of a TEST/TEST_MSG call
 147  */
 148 static __be32 *
 149 nlm_encode_testres(__be32 *p, struct nlm_res *resp)
 150 {
 151         s32             start, len;
 152
 153         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 154                 return NULL;
 155         *p++ = resp->status;
 156
 157         if (resp->status == nlm_lck_denied) {
 158                 struct file_lock        *fl = &resp->lock.fl;
 159
 160                 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
 161                 *p++ = htonl(resp->lock.svid);
 162
 163                 /* Encode owner handle. */
 164                 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
 165                         return NULL;
 166
 167                 start = loff_t_to_s32(fl->fl_start);
 168                 if (fl->fl_end == OFFSET_MAX)
 169                         len = 0;
 170                 else
 171                         len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
 172
 173                 *p++ = htonl(start);
 174                 *p++ = htonl(len);
 175         }
 176
 177         return p;
 178 }
 179
 180
 181 /*
 182  * First, the server side XDR functions
 183  */
 184 int
 185 nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 186 {
 187         u32     exclusive;
 188
 189         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 190                 return 0;
 191
 192         exclusive = ntohl(*p++);
 193         if (!(p = nlm_decode_lock(p, &argp->lock)))
 194                 return 0;
 195         if (exclusive)
 196                 argp->lock.fl.fl_type = F_WRLCK;
 197
 198         return xdr_argsize_check(rqstp, p);
 199 }
 200
 201 int
 202 nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 203 {
 204         if (!(p = nlm_encode_testres(p, resp)))
 205                 return 0;
 206         return xdr_ressize_check(rqstp, p);
 207 }
 208
 209 int
 210 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 211 {
 212         u32     exclusive;
 213
 214         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 215                 return 0;
 216         argp->block  = ntohl(*p++);
 217         exclusive    = ntohl(*p++);
 218         if (!(p = nlm_decode_lock(p, &argp->lock)))
 219                 return 0;
 220         if (exclusive)
 221                 argp->lock.fl.fl_type = F_WRLCK;
 222         argp->reclaim = ntohl(*p++);
 223         argp->state   = ntohl(*p++);
 224         argp->monitor = 1;              /* monitor client by default */
 225
 226         return xdr_argsize_check(rqstp, p);
 227 }
 228
 229 int
 230 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 231 {
 232         u32     exclusive;
 233
 234         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 235                 return 0;
 236         argp->block = ntohl(*p++);
 237         exclusive = ntohl(*p++);
 238         if (!(p = nlm_decode_lock(p, &argp->lock)))
 239                 return 0;
 240         if (exclusive)
 241                 argp->lock.fl.fl_type = F_WRLCK;
 242         return xdr_argsize_check(rqstp, p);
 243 }
 244
 245 int
 246 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 247 {
 248         if (!(p = nlm_decode_cookie(p, &argp->cookie))
 249          || !(p = nlm_decode_lock(p, &argp->lock)))
 250                 return 0;
 251         argp->lock.fl.fl_type = F_UNLCK;
 252         return xdr_argsize_check(rqstp, p);
 253 }
 254
 255 int
 256 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 257 {
 258         struct nlm_lock *lock = &argp->lock;
 259
 260         memset(lock, 0, sizeof(*lock));
 261         locks_init_lock(&lock->fl);
 262         lock->svid = ~(u32) 0;
 263         lock->fl.fl_pid = (pid_t)lock->svid;
 264
 265         if (!(p = nlm_decode_cookie(p, &argp->cookie))
 266          || !(p = xdr_decode_string_inplace(p, &lock->caller,
 267                                             &lock->len, NLM_MAXSTRLEN))
 268          || !(p = nlm_decode_fh(p, &lock->fh))
 269          || !(p = nlm_decode_oh(p, &lock->oh)))
 270                 return 0;
 271         argp->fsm_mode = ntohl(*p++);
 272         argp->fsm_access = ntohl(*p++);
 273         return xdr_argsize_check(rqstp, p);
 274 }
 275
 276 int
 277 nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 278 {
 279         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 280                 return 0;
 281         *p++ = resp->status;
 282         *p++ = xdr_zero;                /* sequence argument */
 283         return xdr_ressize_check(rqstp, p);
 284 }
 285
 286 int
 287 nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 288 {
 289         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 290                 return 0;
 291         *p++ = resp->status;
 292         return xdr_ressize_check(rqstp, p);
 293 }
 294
 295 int
 296 nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
 297 {
 298         struct nlm_lock *lock = &argp->lock;
 299
 300         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 301                                             &lock->len, NLM_MAXSTRLEN)))
 302                 return 0;
 303         argp->state = ntohl(*p++);
 304         return xdr_argsize_check(rqstp, p);
 305 }
 306
 307 int
 308 nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
 309 {
 310         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 311                 return 0;
 312         argp->state = ntohl(*p++);
 313         memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
 314         p += XDR_QUADLEN(SM_PRIV_SIZE);
 315         return xdr_argsize_check(rqstp, p);
 316 }
 317
 318 int
 319 nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 320 {
 321         if (!(p = nlm_decode_cookie(p, &resp->cookie)))
 322                 return 0;
 323         resp->status = *p++;
 324         return xdr_argsize_check(rqstp, p);
 325 }
 326
 327 int
 328 nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 329 {
 330         return xdr_argsize_check(rqstp, p);
 331 }
 332
 333 int
 334 nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 335 {
 336         return xdr_ressize_check(rqstp, p);
 337 }