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
  22 static inline loff_t
  23 s64_to_loff_t(__s64 offset)
  24 {
  25         return (loff_t)offset;
  26 }
  27
  28
  29 static inline s64
  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 *
  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 *
  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 *
  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 *
 100 nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
 101 {
 102         return xdr_decode_netobj(p, oh);
 103 }
 104
 105 static __be32 *
 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 *
 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
 182 nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
 183 {
 184         struct nlm_args *argp = rqstp->rq_argp;
 185         u32     exclusive;
 186
 187         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 188                 return 0;
 189
 190         exclusive = ntohl(*p++);
 191         if (!(p = nlm4_decode_lock(p, &argp->lock)))
 192                 return 0;
 193         if (exclusive)
 194                 argp->lock.fl.fl_type = F_WRLCK;
 195
 196         return xdr_argsize_check(rqstp, p);
 197 }
 198
 199 int
 200 nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
 201 {
 202         struct nlm_res *resp = rqstp->rq_resp;
 203
 204         if (!(p = nlm4_encode_testres(p, resp)))
 205                 return 0;
 206         return xdr_ressize_check(rqstp, p);
 207 }
 208
 209 int
 210 nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
 211 {
 212         struct nlm_args *argp = rqstp->rq_argp;
 213         u32     exclusive;
 214
 215         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 216                 return 0;
 217         argp->block  = ntohl(*p++);
 218         exclusive    = ntohl(*p++);
 219         if (!(p = nlm4_decode_lock(p, &argp->lock)))
 220                 return 0;
 221         if (exclusive)
 222                 argp->lock.fl.fl_type = F_WRLCK;
 223         argp->reclaim = ntohl(*p++);
 224         argp->state   = ntohl(*p++);
 225         argp->monitor = 1;              /* monitor client by default */
 226
 227         return xdr_argsize_check(rqstp, p);
 228 }
 229
 230 int
 231 nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
 232 {
 233         struct nlm_args *argp = rqstp->rq_argp;
 234         u32     exclusive;
 235
 236         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 237                 return 0;
 238         argp->block = ntohl(*p++);
 239         exclusive = ntohl(*p++);
 240         if (!(p = nlm4_decode_lock(p, &argp->lock)))
 241                 return 0;
 242         if (exclusive)
 243                 argp->lock.fl.fl_type = F_WRLCK;
 244         return xdr_argsize_check(rqstp, p);
 245 }
 246
 247 int
 248 nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
 249 {
 250         struct nlm_args *argp = rqstp->rq_argp;
 251
 252         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 253          || !(p = nlm4_decode_lock(p, &argp->lock)))
 254                 return 0;
 255         argp->lock.fl.fl_type = F_UNLCK;
 256         return xdr_argsize_check(rqstp, p);
 257 }
 258
 259 int
 260 nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
 261 {
 262         struct nlm_args *argp = rqstp->rq_argp;
 263         struct nlm_lock *lock = &argp->lock;
 264
 265         memset(lock, 0, sizeof(*lock));
 266         locks_init_lock(&lock->fl);
 267         lock->svid = ~(u32) 0;
 268         lock->fl.fl_pid = (pid_t)lock->svid;
 269
 270         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 271          || !(p = xdr_decode_string_inplace(p, &lock->caller,
 272                                             &lock->len, NLM_MAXSTRLEN))
 273          || !(p = nlm4_decode_fh(p, &lock->fh))
 274          || !(p = nlm4_decode_oh(p, &lock->oh)))
 275                 return 0;
 276         argp->fsm_mode = ntohl(*p++);
 277         argp->fsm_access = ntohl(*p++);
 278         return xdr_argsize_check(rqstp, p);
 279 }
 280
 281 int
 282 nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
 283 {
 284         struct nlm_res *resp = rqstp->rq_resp;
 285
 286         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 287                 return 0;
 288         *p++ = resp->status;
 289         *p++ = xdr_zero;                /* sequence argument */
 290         return xdr_ressize_check(rqstp, p);
 291 }
 292
 293 int
 294 nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
 295 {
 296         struct nlm_res *resp = rqstp->rq_resp;
 297
 298         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 299                 return 0;
 300         *p++ = resp->status;
 301         return xdr_ressize_check(rqstp, p);
 302 }
 303
 304 int
 305 nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
 306 {
 307         struct nlm_args *argp = rqstp->rq_argp;
 308         struct nlm_lock *lock = &argp->lock;
 309
 310         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 311                                             &lock->len, NLM_MAXSTRLEN)))
 312                 return 0;
 313         argp->state = ntohl(*p++);
 314         return xdr_argsize_check(rqstp, p);
 315 }
 316
 317 int
 318 nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
 319 {
 320         struct nlm_reboot *argp = rqstp->rq_argp;
 321
 322         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 323                 return 0;
 324         argp->state = ntohl(*p++);
 325         memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
 326         p += XDR_QUADLEN(SM_PRIV_SIZE);
 327         return xdr_argsize_check(rqstp, p);
 328 }
 329
 330 int
 331 nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
 332 {
 333         struct nlm_res *resp = rqstp->rq_argp;
 334
 335         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 336                 return 0;
 337         resp->status = *p++;
 338         return xdr_argsize_check(rqstp, p);
 339 }
 340
 341 int
 342 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
 343 {
 344         return xdr_argsize_check(rqstp, p);
 345 }
 346
 347 int
 348 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
 349 {
 350         return xdr_ressize_check(rqstp, p);
 351 }