Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 349 insertions, 0 deletions

diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
new file mode 100644
index 0000000000..5fcbf30cd2
--- /dev/null
+++ b/fs/lockd/xdr4.c
@@ -0,0 +1,349 @@
+// 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"
+
+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;
+}
+
+void nlm4svc_set_file_lock_range(struct file_lock *fl, u64 off, u64 len)
+{
+	s64 end = off + len - 1;
+
+	fl->fl_start = off;
+	if (len == 0 || end < 0)
+		fl->fl_end = OFFSET_MAX;
+	else
+		fl->fl_end = end;
+}
+
+/*
+ * 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;
+
+	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, &lock->lock_start) < 0)
+		return false;
+	if (xdr_stream_decode_u64(xdr, &lock->lock_len) < 0)
+		return false;
+
+	locks_init_lock(fl);
+	fl->fl_flags = FL_POSIX;
+	fl->fl_type  = F_RDLCK;
+	nlm4svc_set_file_lock_range(fl, lock->lock_start, lock->lock_len);
+	return true;
+}
+
+static bool
+svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
+{
+	const struct file_lock *fl = &lock->fl;
+	s64 start, len;
+
+	/* exclusive */
+	if (xdr_stream_encode_bool(xdr, fl->fl_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_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);
+	if (xdr_stream_encode_u64(xdr, start) < 0)
+		return false;
+	if (xdr_stream_encode_u64(xdr, len) < 0)
+		return false;
+
+	return true;
+}
+
+static bool
+svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_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
+nlm4svc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	return true;
+}
+
+bool
+nlm4svc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_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.fl_type = F_WRLCK;
+
+	return true;
+}
+
+bool
+nlm4svc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_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.fl_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
+nlm4svc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_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.fl_type = F_WRLCK;
+
+	return true;
+}
+
+bool
+nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_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.fl_type = F_UNLCK;
+
+	return true;
+}
+
+bool
+nlm4svc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_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
+nlm4svc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_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
+nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	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 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
+nlm4svc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_args *argp = rqstp->rq_argp;
+	struct nlm_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
+nlm4svc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	return true;
+}
+
+bool
+nlm4svc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_res *resp = rqstp->rq_resp;
+
+	return svcxdr_encode_cookie(xdr, &resp->cookie) &&
+		svcxdr_encode_testrply(xdr, resp);
+}
+
+bool
+nlm4svc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_res *resp = rqstp->rq_resp;
+
+	return svcxdr_encode_cookie(xdr, &resp->cookie) &&
+		svcxdr_encode_stats(xdr, resp->status);
+}
+
+bool
+nlm4svc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+	struct nlm_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;
+}