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