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// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/lockd/xdr4.c
*
* XDR support for lockd and the lock client.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
* Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
*/
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/nfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/stats.h>
#include <linux/lockd/lockd.h>
#include "svcxdr.h"
#define NLMDBG_FACILITY NLMDBG_XDR
static inline loff_t
s64_to_loff_t(__s64 offset)
{
return (loff_t)offset;
}
static inline s64
loff_t_to_s64(loff_t offset)
{
s64 res;
if (offset > NLM4_OFFSET_MAX)
res = NLM4_OFFSET_MAX;
else if (offset < -NLM4_OFFSET_MAX)
res = -NLM4_OFFSET_MAX;
else
res = offset;
return res;
}
static __be32 *
nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
{
*p++ = htonl(c->len);
memcpy(p, c->data, c->len);
p+=XDR_QUADLEN(c->len);
return p;
}
/*
* NLM file handles are defined by specification to be a variable-length
* XDR opaque no longer than 1024 bytes. However, this implementation
* limits their length to the size of an NFSv3 file handle.
*/
static bool
svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
{
__be32 *p;
u32 len;
if (xdr_stream_decode_u32(xdr, &len) < 0)
return false;
if (len > NFS_MAXFHSIZE)
return false;
p = xdr_inline_decode(xdr, len);
if (!p)
return false;
fh->size = len;
memcpy(fh->data, p, len);
memset(fh->data + len, 0, sizeof(fh->data) - len);
return true;
}
static bool
svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
{
struct file_lock *fl = &lock->fl;
u64 len, start;
s64 end;
if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
return false;
if (!svcxdr_decode_fhandle(xdr, &lock->fh))
return false;
if (!svcxdr_decode_owner(xdr, &lock->oh))
return false;
if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
return false;
if (xdr_stream_decode_u64(xdr, &start) < 0)
return false;
if (xdr_stream_decode_u64(xdr, &len) < 0)
return false;
locks_init_lock(fl);
fl->fl_flags = FL_POSIX;
fl->fl_type = F_RDLCK;
end = start + len - 1;
fl->fl_start = s64_to_loff_t(start);
if (len == 0 || end < 0)
fl->fl_end = OFFSET_MAX;
else
fl->fl_end = s64_to_loff_t(end);
return true;
}
/*
* Encode result of a TEST/TEST_MSG call
*/
static __be32 *
nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
{
s64 start, len;
dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
return NULL;
*p++ = resp->status;
if (resp->status == nlm_lck_denied) {
struct file_lock *fl = &resp->lock.fl;
*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
*p++ = htonl(resp->lock.svid);
/* Encode owner handle. */
if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
return NULL;
start = loff_t_to_s64(fl->fl_start);
if (fl->fl_end == OFFSET_MAX)
len = 0;
else
len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
p = xdr_encode_hyper(p, start);
p = xdr_encode_hyper(p, len);
dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
resp->status, (int)resp->lock.svid, fl->fl_type,
(long long)fl->fl_start, (long long)fl->fl_end);
}
dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
return p;
}
/*
* Decode Call arguments
*/
int
nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
{
return 1;
}
int
nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_args *argp = rqstp->rq_argp;
u32 exclusive;
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
return 0;
if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
return 0;
if (!svcxdr_decode_lock(xdr, &argp->lock))
return 0;
if (exclusive)
argp->lock.fl.fl_type = F_WRLCK;
return 1;
}
int
nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_args *argp = rqstp->rq_argp;
u32 exclusive;
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
return 0;
if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
return 0;
if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
return 0;
if (!svcxdr_decode_lock(xdr, &argp->lock))
return 0;
if (exclusive)
argp->lock.fl.fl_type = F_WRLCK;
if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
return 0;
if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
return 0;
argp->monitor = 1; /* monitor client by default */
return 1;
}
int
nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_args *argp = rqstp->rq_argp;
u32 exclusive;
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
return 0;
if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
return 0;
if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
return 0;
if (!svcxdr_decode_lock(xdr, &argp->lock))
return 0;
if (exclusive)
argp->lock.fl.fl_type = F_WRLCK;
return 1;
}
int
nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_args *argp = rqstp->rq_argp;
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
return 0;
if (!svcxdr_decode_lock(xdr, &argp->lock))
return 0;
argp->lock.fl.fl_type = F_UNLCK;
return 1;
}
int
nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_res *resp = rqstp->rq_argp;
if (!svcxdr_decode_cookie(xdr, &resp->cookie))
return 0;
if (!svcxdr_decode_stats(xdr, &resp->status))
return 0;
return 1;
}
int
nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_reboot *argp = rqstp->rq_argp;
u32 len;
if (xdr_stream_decode_u32(xdr, &len) < 0)
return 0;
if (len > SM_MAXSTRLEN)
return 0;
p = xdr_inline_decode(xdr, len);
if (!p)
return 0;
argp->len = len;
argp->mon = (char *)p;
if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
return 0;
p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
if (!p)
return 0;
memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
return 1;
}
int
nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_args *argp = rqstp->rq_argp;
struct nlm_lock *lock = &argp->lock;
memset(lock, 0, sizeof(*lock));
locks_init_lock(&lock->fl);
lock->svid = ~(u32)0;
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
return 0;
if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
return 0;
if (!svcxdr_decode_fhandle(xdr, &lock->fh))
return 0;
if (!svcxdr_decode_owner(xdr, &lock->oh))
return 0;
/* XXX: Range checks are missing in the original code */
if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
return 0;
if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
return 0;
return 1;
}
int
nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nlm_args *argp = rqstp->rq_argp;
struct nlm_lock *lock = &argp->lock;
if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
return 0;
if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
return 0;
return 1;
}
int
nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
{
struct nlm_res *resp = rqstp->rq_resp;
if (!(p = nlm4_encode_testres(p, resp)))
return 0;
return xdr_ressize_check(rqstp, p);
}
int
nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
{
struct nlm_res *resp = rqstp->rq_resp;
if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
return 0;
*p++ = resp->status;
*p++ = xdr_zero; /* sequence argument */
return xdr_ressize_check(rqstp, p);
}
int
nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
{
struct nlm_res *resp = rqstp->rq_resp;
if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
return 0;
*p++ = resp->status;
return xdr_ressize_check(rqstp, p);
}
int
nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
{
return xdr_ressize_check(rqstp, p);
}
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