Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/lockd/xdr.c
 *
 * XDR support for lockd and the lock client.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */
 
#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 <uapi/linux/nfs2.h>
 
#define NLMDBG_FACILITY		NLMDBG_XDR
 
 
static inline loff_t
s32_to_loff_t(__s32 offset)
{
<------>return (loff_t)offset;
}
 
static inline __s32
loff_t_to_s32(loff_t offset)
{
<------>__s32 res;
<------>if (offset >= NLM_OFFSET_MAX)
<------><------>res = NLM_OFFSET_MAX;
<------>else if (offset <= -NLM_OFFSET_MAX)
<------><------>res = -NLM_OFFSET_MAX;
<------>else
<------><------>res = offset;
<------>return res;
}
 
/*
 * XDR functions for basic NLM types
 */
static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
{
<------>unsigned int	len;
 
<------>len = ntohl(*p++);
<------>
<------>if(len==0)
<------>{
<------><------>c->len=4;
<------><------>memset(c->data, 0, 4);	/* hockeypux brain damage */
<------>}
<------>else if(len<=NLM_MAXCOOKIELEN)
<------>{
<------><------>c->len=len;
<------><------>memcpy(c->data, p, len);
<------><------>p+=XDR_QUADLEN(len);
<------>}
<------>else 
<------>{
<------><------>dprintk("lockd: bad cookie size %d (only cookies under "
<------><------><------>"%d bytes are supported.)\n",
<------><------><------><------>len, NLM_MAXCOOKIELEN);
<------><------>return NULL;
<------>}
<------>return p;
}
 
static inline __be32 *
nlm_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;
}
 
static __be32 *
nlm_decode_fh(__be32 *p, struct nfs_fh *f)
{
<------>unsigned int	len;
 
<------>if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
<------><------>dprintk("lockd: bad fhandle size %d (should be %d)\n",
<------><------><------>len, NFS2_FHSIZE);
<------><------>return NULL;
<------>}
<------>f->size = NFS2_FHSIZE;
<------>memset(f->data, 0, sizeof(f->data));
<------>memcpy(f->data, p, NFS2_FHSIZE);
<------>return p + XDR_QUADLEN(NFS2_FHSIZE);
}
 
/*
 * Encode and decode owner handle
 */
static inline __be32 *
nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
{
<------>return xdr_decode_netobj(p, oh);
}
 
static inline __be32 *
nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
{
<------>return xdr_encode_netobj(p, oh);
}
 
static __be32 *
nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
{
<------>struct file_lock	*fl = &lock->fl;
<------>s32			start, len, end;
 
<------>if (!(p = xdr_decode_string_inplace(p, &lock->caller,
<------><------><------><------><------>    &lock->len,
<------><------><------><------><------>    NLM_MAXSTRLEN))
<------> || !(p = nlm_decode_fh(p, &lock->fh))
<------> || !(p = nlm_decode_oh(p, &lock->oh)))
<------><------>return NULL;
<------>lock->svid  = ntohl(*p++);
 
<------>locks_init_lock(fl);
<------>fl->fl_flags = FL_POSIX;
<------>fl->fl_type  = F_RDLCK;		/* as good as anything else */
<------>start = ntohl(*p++);
<------>len = ntohl(*p++);
<------>end = start + len - 1;
 
<------>fl->fl_start = s32_to_loff_t(start);
 
<------>if (len == 0 || end < 0)
<------><------>fl->fl_end = OFFSET_MAX;
<------>else
<------><------>fl->fl_end = s32_to_loff_t(end);
<------>return p;
}
 
/*
 * Encode result of a TEST/TEST_MSG call
 */
static __be32 *
nlm_encode_testres(__be32 *p, struct nlm_res *resp)
{
<------>s32		start, len;
 
<------>if (!(p = nlm_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_s32(fl->fl_start);
<------><------>if (fl->fl_end == OFFSET_MAX)
<------><------><------>len = 0;
<------><------>else
<------><------><------>len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
 
<------><------>*p++ = htonl(start);
<------><------>*p++ = htonl(len);
<------>}
 
<------>return p;
}
 
 
/*
 * First, the server side XDR functions
 */
int
nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_args *argp = rqstp->rq_argp;
<------>u32	exclusive;
 
<------>if (!(p = nlm_decode_cookie(p, &argp->cookie)))
<------><------>return 0;
 
<------>exclusive = ntohl(*p++);
<------>if (!(p = nlm_decode_lock(p, &argp->lock)))
<------><------>return 0;
<------>if (exclusive)
<------><------>argp->lock.fl.fl_type = F_WRLCK;
 
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_res *resp = rqstp->rq_resp;
 
<------>if (!(p = nlm_encode_testres(p, resp)))
<------><------>return 0;
<------>return xdr_ressize_check(rqstp, p);
}
 
int
nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_args *argp = rqstp->rq_argp;
<------>u32	exclusive;
 
<------>if (!(p = nlm_decode_cookie(p, &argp->cookie)))
<------><------>return 0;
<------>argp->block  = ntohl(*p++);
<------>exclusive    = ntohl(*p++);
<------>if (!(p = nlm_decode_lock(p, &argp->lock)))
<------><------>return 0;
<------>if (exclusive)
<------><------>argp->lock.fl.fl_type = F_WRLCK;
<------>argp->reclaim = ntohl(*p++);
<------>argp->state   = ntohl(*p++);
<------>argp->monitor = 1;		/* monitor client by default */
 
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_args *argp = rqstp->rq_argp;
<------>u32	exclusive;
 
<------>if (!(p = nlm_decode_cookie(p, &argp->cookie)))
<------><------>return 0;
<------>argp->block = ntohl(*p++);
<------>exclusive = ntohl(*p++);
<------>if (!(p = nlm_decode_lock(p, &argp->lock)))
<------><------>return 0;
<------>if (exclusive)
<------><------>argp->lock.fl.fl_type = F_WRLCK;
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_args *argp = rqstp->rq_argp;
 
<------>if (!(p = nlm_decode_cookie(p, &argp->cookie))
<------> || !(p = nlm_decode_lock(p, &argp->lock)))
<------><------>return 0;
<------>argp->lock.fl.fl_type = F_UNLCK;
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
{
<------>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 (!(p = nlm_decode_cookie(p, &argp->cookie))
<------> || !(p = xdr_decode_string_inplace(p, &lock->caller,
<------><------><------><------><------>    &lock->len, NLM_MAXSTRLEN))
<------> || !(p = nlm_decode_fh(p, &lock->fh))
<------> || !(p = nlm_decode_oh(p, &lock->oh)))
<------><------>return 0;
<------>argp->fsm_mode = ntohl(*p++);
<------>argp->fsm_access = ntohl(*p++);
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_res *resp = rqstp->rq_resp;
 
<------>if (!(p = nlm_encode_cookie(p, &resp->cookie)))
<------><------>return 0;
<------>*p++ = resp->status;
<------>*p++ = xdr_zero;		/* sequence argument */
<------>return xdr_ressize_check(rqstp, p);
}
 
int
nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_res *resp = rqstp->rq_resp;
 
<------>if (!(p = nlm_encode_cookie(p, &resp->cookie)))
<------><------>return 0;
<------>*p++ = resp->status;
<------>return xdr_ressize_check(rqstp, p);
}
 
int
nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_args *argp = rqstp->rq_argp;
<------>struct nlm_lock	*lock = &argp->lock;
 
<------>if (!(p = xdr_decode_string_inplace(p, &lock->caller,
<------><------><------><------><------>    &lock->len, NLM_MAXSTRLEN)))
<------><------>return 0;
<------>argp->state = ntohl(*p++);
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_reboot *argp = rqstp->rq_argp;
 
<------>if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
<------><------>return 0;
<------>argp->state = ntohl(*p++);
<------>memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
<------>p += XDR_QUADLEN(SM_PRIV_SIZE);
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nlm_res *resp = rqstp->rq_argp;
 
<------>if (!(p = nlm_decode_cookie(p, &resp->cookie)))
<------><------>return 0;
<------>resp->status = *p++;
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
{
<------>return xdr_argsize_check(rqstp, p);
}
 
int
nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
{
<------>return xdr_ressize_check(rqstp, p);
}