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-rw-r--r--fs/lockd/xdr.c354
1 files changed, 354 insertions, 0 deletions
diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c
new file mode 100644
index 000000000..2fb5748da
--- /dev/null
+++ b/fs/lockd/xdr.c
@@ -0,0 +1,354 @@
+// 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>
+
+#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 nlm_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->fl_flags = FL_POSIX;
+ fl->fl_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 nlm_lock *lock)
+{
+ const struct file_lock *fl = &lock->fl;
+ s32 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_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 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
+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 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
+nlmsvc_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
+nlmsvc_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
+nlmsvc_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
+nlmsvc_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
+nlmsvc_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
+nlmsvc_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
+nlmsvc_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
+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 nlm_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 nlm_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 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 05:09:17 +0000