linux/fs/lockd/xdr4.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * linux/fs/lockd/xdr4.c
   4 *
   5 * XDR support for lockd and the lock client.
   6 *
   7 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   8 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
   9 */
  10
  11#include <linux/types.h>
  12#include <linux/sched.h>
  13#include <linux/nfs.h>
  14
  15#include <linux/sunrpc/xdr.h>
  16#include <linux/sunrpc/clnt.h>
  17#include <linux/sunrpc/svc.h>
  18#include <linux/sunrpc/stats.h>
  19#include <linux/lockd/lockd.h>
  20
  21#define NLMDBG_FACILITY         NLMDBG_XDR
  22
  23static inline loff_t
  24s64_to_loff_t(__s64 offset)
  25{
  26        return (loff_t)offset;
  27}
  28
  29
  30static inline s64
  31loff_t_to_s64(loff_t offset)
  32{
  33        s64 res;
  34        if (offset > NLM4_OFFSET_MAX)
  35                res = NLM4_OFFSET_MAX;
  36        else if (offset < -NLM4_OFFSET_MAX)
  37                res = -NLM4_OFFSET_MAX;
  38        else
  39                res = offset;
  40        return res;
  41}
  42
  43/*
  44 * XDR functions for basic NLM types
  45 */
  46static __be32 *
  47nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
  48{
  49        unsigned int    len;
  50
  51        len = ntohl(*p++);
  52        
  53        if(len==0)
  54        {
  55                c->len=4;
  56                memset(c->data, 0, 4);  /* hockeypux brain damage */
  57        }
  58        else if(len<=NLM_MAXCOOKIELEN)
  59        {
  60                c->len=len;
  61                memcpy(c->data, p, len);
  62                p+=XDR_QUADLEN(len);
  63        }
  64        else 
  65        {
  66                dprintk("lockd: bad cookie size %d (only cookies under "
  67                        "%d bytes are supported.)\n",
  68                                len, NLM_MAXCOOKIELEN);
  69                return NULL;
  70        }
  71        return p;
  72}
  73
  74static __be32 *
  75nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
  76{
  77        *p++ = htonl(c->len);
  78        memcpy(p, c->data, c->len);
  79        p+=XDR_QUADLEN(c->len);
  80        return p;
  81}
  82
  83static __be32 *
  84nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
  85{
  86        memset(f->data, 0, sizeof(f->data));
  87        f->size = ntohl(*p++);
  88        if (f->size > NFS_MAXFHSIZE) {
  89                dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
  90                        f->size, NFS_MAXFHSIZE);
  91                return NULL;
  92        }
  93        memcpy(f->data, p, f->size);
  94        return p + XDR_QUADLEN(f->size);
  95}
  96
  97/*
  98 * Encode and decode owner handle
  99 */
 100static __be32 *
 101nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
 102{
 103        return xdr_decode_netobj(p, oh);
 104}
 105
 106static __be32 *
 107nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
 108{
 109        struct file_lock        *fl = &lock->fl;
 110        __u64                   len, start;
 111        __s64                   end;
 112
 113        if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 114                                            &lock->len, NLM_MAXSTRLEN))
 115         || !(p = nlm4_decode_fh(p, &lock->fh))
 116         || !(p = nlm4_decode_oh(p, &lock->oh)))
 117                return NULL;
 118        lock->svid  = ntohl(*p++);
 119
 120        locks_init_lock(fl);
 121        fl->fl_flags = FL_POSIX;
 122        fl->fl_type  = F_RDLCK;         /* as good as anything else */
 123        p = xdr_decode_hyper(p, &start);
 124        p = xdr_decode_hyper(p, &len);
 125        end = start + len - 1;
 126
 127        fl->fl_start = s64_to_loff_t(start);
 128
 129        if (len == 0 || end < 0)
 130                fl->fl_end = OFFSET_MAX;
 131        else
 132                fl->fl_end = s64_to_loff_t(end);
 133        return p;
 134}
 135
 136/*
 137 * Encode result of a TEST/TEST_MSG call
 138 */
 139static __be32 *
 140nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
 141{
 142        s64             start, len;
 143
 144        dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
 145        if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 146                return NULL;
 147        *p++ = resp->status;
 148
 149        if (resp->status == nlm_lck_denied) {
 150                struct file_lock        *fl = &resp->lock.fl;
 151
 152                *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
 153                *p++ = htonl(resp->lock.svid);
 154
 155                /* Encode owner handle. */
 156                if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
 157                        return NULL;
 158
 159                start = loff_t_to_s64(fl->fl_start);
 160                if (fl->fl_end == OFFSET_MAX)
 161                        len = 0;
 162                else
 163                        len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
 164                
 165                p = xdr_encode_hyper(p, start);
 166                p = xdr_encode_hyper(p, len);
 167                dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
 168                        resp->status, (int)resp->lock.svid, fl->fl_type,
 169                        (long long)fl->fl_start,  (long long)fl->fl_end);
 170        }
 171
 172        dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
 173        return p;
 174}
 175
 176
 177/*
 178 * First, the server side XDR functions
 179 */
 180int
 181nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
 182{
 183        struct nlm_args *argp = rqstp->rq_argp;
 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)
 200{
 201        struct nlm_res *resp = rqstp->rq_resp;
 202
 203        if (!(p = nlm4_encode_testres(p, resp)))
 204                return 0;
 205        return xdr_ressize_check(rqstp, p);
 206}
 207
 208int
 209nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
 210{
 211        struct nlm_args *argp = rqstp->rq_argp;
 212        u32     exclusive;
 213
 214        if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 215                return 0;
 216        argp->block  = ntohl(*p++);
 217        exclusive    = ntohl(*p++);
 218        if (!(p = nlm4_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
 229int
 230nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
 231{
 232        struct nlm_args *argp = rqstp->rq_argp;
 233        u32     exclusive;
 234
 235        if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 236                return 0;
 237        argp->block = ntohl(*p++);
 238        exclusive = ntohl(*p++);
 239        if (!(p = nlm4_decode_lock(p, &argp->lock)))
 240                return 0;
 241        if (exclusive)
 242                argp->lock.fl.fl_type = F_WRLCK;
 243        return xdr_argsize_check(rqstp, p);
 244}
 245
 246int
 247nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
 248{
 249        struct nlm_args *argp = rqstp->rq_argp;
 250
 251        if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 252         || !(p = nlm4_decode_lock(p, &argp->lock)))
 253                return 0;
 254        argp->lock.fl.fl_type = F_UNLCK;
 255        return xdr_argsize_check(rqstp, p);
 256}
 257
 258int
 259nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
 260{
 261        struct nlm_args *argp = rqstp->rq_argp;
 262        struct nlm_lock *lock = &argp->lock;
 263
 264        memset(lock, 0, sizeof(*lock));
 265        locks_init_lock(&lock->fl);
 266        lock->svid = ~(u32) 0;
 267
 268        if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 269         || !(p = xdr_decode_string_inplace(p, &lock->caller,
 270                                            &lock->len, NLM_MAXSTRLEN))
 271         || !(p = nlm4_decode_fh(p, &lock->fh))
 272         || !(p = nlm4_decode_oh(p, &lock->oh)))
 273                return 0;
 274        argp->fsm_mode = ntohl(*p++);
 275        argp->fsm_access = ntohl(*p++);
 276        return xdr_argsize_check(rqstp, p);
 277}
 278
 279int
 280nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
 281{
 282        struct nlm_res *resp = rqstp->rq_resp;
 283
 284        if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 285                return 0;
 286        *p++ = resp->status;
 287        *p++ = xdr_zero;                /* sequence argument */
 288        return xdr_ressize_check(rqstp, p);
 289}
 290
 291int
 292nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
 293{
 294        struct nlm_res *resp = rqstp->rq_resp;
 295
 296        if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 297                return 0;
 298        *p++ = resp->status;
 299        return xdr_ressize_check(rqstp, p);
 300}
 301
 302int
 303nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
 304{
 305        struct nlm_args *argp = rqstp->rq_argp;
 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
 315int
 316nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
 317{
 318        struct nlm_reboot *argp = rqstp->rq_argp;
 319
 320        if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 321                return 0;
 322        argp->state = ntohl(*p++);
 323        memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
 324        p += XDR_QUADLEN(SM_PRIV_SIZE);
 325        return xdr_argsize_check(rqstp, p);
 326}
 327
 328int
 329nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
 330{
 331        struct nlm_res *resp = rqstp->rq_argp;
 332
 333        if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 334                return 0;
 335        resp->status = *p++;
 336        return xdr_argsize_check(rqstp, p);
 337}
 338
 339int
 340nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
 341{
 342        return xdr_argsize_check(rqstp, p);
 343}
 344
 345int
 346nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
 347{
 348        return xdr_ressize_check(rqstp, p);
 349}
 350