+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Encode/decode NLM basic data types
- *
- * Basic NLMv3 XDR data types are not defined in an IETF standards
- * document. X/Open has a description of these data types that
- * is useful. See Chapter 10 of "Protocols for Interworking:
- * XNFS, Version 3W".
- *
- * Basic NLMv4 XDR data types are defined in Appendix II.1.4 of
- * RFC 1813: "NFS Version 3 Protocol Specification".
- *
- * Author: Chuck Lever <chuck.lever@oracle.com>
- *
- * Copyright (c) 2020, Oracle and/or its affiliates.
- */
-
-#ifndef _LOCKD_SVCXDR_H_
-#define _LOCKD_SVCXDR_H_
-
-static inline bool
-svcxdr_decode_stats(struct xdr_stream *xdr, __be32 *status)
-{
- __be32 *p;
-
- p = xdr_inline_decode(xdr, XDR_UNIT);
- if (!p)
- return false;
- *status = *p;
-
- return true;
-}
-
-static inline bool
-svcxdr_encode_stats(struct xdr_stream *xdr, __be32 status)
-{
- __be32 *p;
-
- p = xdr_reserve_space(xdr, XDR_UNIT);
- if (!p)
- return false;
- *p = status;
-
- return true;
-}
-
-static inline bool
-svcxdr_decode_string(struct xdr_stream *xdr, char **data, unsigned int *data_len)
-{
- __be32 *p;
- u32 len;
-
- if (xdr_stream_decode_u32(xdr, &len) < 0)
- return false;
- if (len > NLM_MAXSTRLEN)
- return false;
- p = xdr_inline_decode(xdr, len);
- if (!p)
- return false;
- *data_len = len;
- *data = (char *)p;
-
- return true;
-}
-
-/*
- * NLM cookies are defined by specification to be a variable-length
- * XDR opaque no longer than 1024 bytes. However, this implementation
- * limits their length to 32 bytes, and treats zero-length cookies
- * specially.
- */
-static inline bool
-svcxdr_decode_cookie(struct xdr_stream *xdr, struct lockd_cookie *cookie)
-{
- __be32 *p;
- u32 len;
-
- if (xdr_stream_decode_u32(xdr, &len) < 0)
- return false;
- if (len > NLM_MAXCOOKIELEN)
- return false;
- if (!len)
- goto out_hpux;
-
- p = xdr_inline_decode(xdr, len);
- if (!p)
- return false;
- cookie->len = len;
- memcpy(cookie->data, p, len);
-
- return true;
-
- /* apparently HPUX can return empty cookies */
-out_hpux:
- cookie->len = 4;
- memset(cookie->data, 0, 4);
- return true;
-}
-
-static inline bool
-svcxdr_encode_cookie(struct xdr_stream *xdr, const struct lockd_cookie *cookie)
-{
- __be32 *p;
-
- if (xdr_stream_encode_u32(xdr, cookie->len) < 0)
- return false;
- p = xdr_reserve_space(xdr, cookie->len);
- if (!p)
- return false;
- memcpy(p, cookie->data, cookie->len);
-
- return true;
-}
-
-static inline bool
-svcxdr_decode_owner(struct xdr_stream *xdr, struct xdr_netobj *obj)
-{
- __be32 *p;
- u32 len;
-
- if (xdr_stream_decode_u32(xdr, &len) < 0)
- return false;
- if (len > XDR_MAX_NETOBJ)
- return false;
- p = xdr_inline_decode(xdr, len);
- if (!p)
- return false;
- obj->len = len;
- obj->data = (u8 *)p;
-
- return true;
-}
-
-static inline bool
-svcxdr_encode_owner(struct xdr_stream *xdr, const struct xdr_netobj *obj)
-{
- if (obj->len > XDR_MAX_NETOBJ)
- return false;
- return xdr_stream_encode_opaque(xdr, obj->data, obj->len) > 0;
-}
-
-#endif /* _LOCKD_SVCXDR_H_ */
+++ /dev/null
-// 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 <uapi/linux/nfs2.h>
-
-#include "lockd.h"
-#include "share.h"
-#include "svcxdr.h"
-
-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;
-}
-
-/*
- * NLM file handles are defined by specification to be a variable-length
- * XDR opaque no longer than 1024 bytes. However, this implementation
- * constrains their length to exactly the length of an NFSv2 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 != NFS2_FHSIZE)
- return false;
-
- p = xdr_inline_decode(xdr, len);
- if (!p)
- return false;
- fh->size = NFS2_FHSIZE;
- memcpy(fh->data, p, len);
- memset(fh->data + NFS2_FHSIZE, 0, sizeof(fh->data) - NFS2_FHSIZE);
-
- return true;
-}
-
-static bool
-svcxdr_decode_lock(struct xdr_stream *xdr, struct lockd_lock *lock)
-{
- struct file_lock *fl = &lock->fl;
- s32 start, len, 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_u32(xdr, &start) < 0)
- return false;
- if (xdr_stream_decode_u32(xdr, &len) < 0)
- return false;
-
- locks_init_lock(fl);
- fl->c.flc_flags = FL_POSIX;
- fl->c.flc_type = F_RDLCK;
- 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 true;
-}
-
-static bool
-svcxdr_encode_holder(struct xdr_stream *xdr, const struct lockd_lock *lock)
-{
- const struct file_lock *fl = &lock->fl;
- s32 start, len;
-
- /* exclusive */
- if (xdr_stream_encode_bool(xdr, fl->c.flc_type != F_RDLCK) < 0)
- return false;
- if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
- return false;
- if (!svcxdr_encode_owner(xdr, &lock->oh))
- return false;
- 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);
- if (xdr_stream_encode_u32(xdr, start) < 0)
- return false;
- if (xdr_stream_encode_u32(xdr, len) < 0)
- return false;
-
- return true;
-}
-
-static bool
-svcxdr_encode_testrply(struct xdr_stream *xdr, const struct lockd_res *resp)
-{
- if (!svcxdr_encode_stats(xdr, resp->status))
- return false;
- switch (resp->status) {
- case nlm_lck_denied:
- if (!svcxdr_encode_holder(xdr, &resp->lock))
- return false;
- }
-
- return true;
-}
-
-
-/*
- * Decode Call arguments
- */
-
-bool
-nlmsvc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- return true;
-}
-
-bool
-nlmsvc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_args *argp = rqstp->rq_argp;
- u32 exclusive;
-
- if (!svcxdr_decode_cookie(xdr, &argp->cookie))
- return false;
- if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
- return false;
- if (!svcxdr_decode_lock(xdr, &argp->lock))
- return false;
- if (exclusive)
- argp->lock.fl.c.flc_type = F_WRLCK;
-
- return true;
-}
-
-bool
-nlmsvc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_args *argp = rqstp->rq_argp;
- u32 exclusive;
-
- if (!svcxdr_decode_cookie(xdr, &argp->cookie))
- return false;
- if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
- return false;
- if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
- return false;
- if (!svcxdr_decode_lock(xdr, &argp->lock))
- return false;
- if (exclusive)
- argp->lock.fl.c.flc_type = F_WRLCK;
- if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
- return false;
- if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
- return false;
- argp->monitor = 1; /* monitor client by default */
-
- return true;
-}
-
-bool
-nlmsvc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_args *argp = rqstp->rq_argp;
- u32 exclusive;
-
- if (!svcxdr_decode_cookie(xdr, &argp->cookie))
- return false;
- if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
- return false;
- if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
- return false;
- if (!svcxdr_decode_lock(xdr, &argp->lock))
- return false;
- if (exclusive)
- argp->lock.fl.c.flc_type = F_WRLCK;
-
- return true;
-}
-
-bool
-nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_args *argp = rqstp->rq_argp;
-
- if (!svcxdr_decode_cookie(xdr, &argp->cookie))
- return false;
- if (!svcxdr_decode_lock(xdr, &argp->lock))
- return false;
- argp->lock.fl.c.flc_type = F_UNLCK;
-
- return true;
-}
-
-bool
-nlmsvc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_res *resp = rqstp->rq_argp;
-
- if (!svcxdr_decode_cookie(xdr, &resp->cookie))
- return false;
- if (!svcxdr_decode_stats(xdr, &resp->status))
- return false;
-
- return true;
-}
-
-bool
-nlmsvc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_reboot *argp = rqstp->rq_argp;
- __be32 *p;
- u32 len;
-
- if (xdr_stream_decode_u32(xdr, &len) < 0)
- return false;
- if (len > SM_MAXSTRLEN)
- return false;
- p = xdr_inline_decode(xdr, len);
- if (!p)
- return false;
- argp->len = len;
- argp->mon = (char *)p;
- if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
- return false;
- p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
- if (!p)
- return false;
- memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
-
- return true;
-}
-
-bool
-nlmsvc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_args *argp = rqstp->rq_argp;
- struct lockd_lock *lock = &argp->lock;
-
- memset(lock, 0, sizeof(*lock));
- locks_init_lock(&lock->fl);
- lock->svid = LOCKD_SHARE_SVID;
-
- if (!svcxdr_decode_cookie(xdr, &argp->cookie))
- return false;
- 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;
- /* XXX: Range checks are missing in the original code */
- if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
- return false;
- if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
- return false;
-
- return true;
-}
-
-bool
-nlmsvc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_args *argp = rqstp->rq_argp;
- struct lockd_lock *lock = &argp->lock;
-
- if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
- return false;
- if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
- return false;
-
- return true;
-}
-
-
-/*
- * Encode Reply results
- */
-
-bool
-nlmsvc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- return true;
-}
-
-bool
-nlmsvc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_res *resp = rqstp->rq_resp;
-
- return svcxdr_encode_cookie(xdr, &resp->cookie) &&
- svcxdr_encode_testrply(xdr, resp);
-}
-
-bool
-nlmsvc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_res *resp = rqstp->rq_resp;
-
- return svcxdr_encode_cookie(xdr, &resp->cookie) &&
- svcxdr_encode_stats(xdr, resp->status);
-}
-
-bool
-nlmsvc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
-{
- struct lockd_res *resp = rqstp->rq_resp;
-
- if (!svcxdr_encode_cookie(xdr, &resp->cookie))
- return false;
- if (!svcxdr_encode_stats(xdr, resp->status))
- return false;
- /* sequence */
- if (xdr_stream_encode_u32(xdr, 0) < 0)
- return false;
-
- return true;
-}
projects / thirdparty / kernel / linux.git / commitdiff
