Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 352 insertions, 0 deletions

diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
new file mode 100644
index 000000000..7ed9edf9a
--- /dev/null
+++ b/fs/lockd/xdr4.c
@@ -0,0 +1,352 @@
+// 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>
+
+#define NLMDBG_FACILITY		NLMDBG_XDR
+
+static inline loff_t
+s64_to_loff_t(__s64 offset)
+{
+	return (loff_t)offset;
+}
+
+
+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;
+}
+
+/*
+ * XDR functions for basic NLM types
+ */
+static __be32 *
+nlm4_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 __be32 *
+nlm4_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 *
+nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
+{
+	memset(f->data, 0, sizeof(f->data));
+	f->size = ntohl(*p++);
+	if (f->size > NFS_MAXFHSIZE) {
+		dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
+			f->size, NFS_MAXFHSIZE);
+		return NULL;
+	}
+      	memcpy(f->data, p, f->size);
+	return p + XDR_QUADLEN(f->size);
+}
+
+/*
+ * Encode and decode owner handle
+ */
+static __be32 *
+nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
+{
+	return xdr_decode_netobj(p, oh);
+}
+
+static __be32 *
+nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
+{
+	struct file_lock	*fl = &lock->fl;
+	__u64			len, start;
+	__s64			end;
+
+	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
+					    &lock->len, NLM_MAXSTRLEN))
+	 || !(p = nlm4_decode_fh(p, &lock->fh))
+	 || !(p = nlm4_decode_oh(p, &lock->oh)))
+		return NULL;
+	lock->svid  = ntohl(*p++);
+
+	locks_init_lock(fl);
+	fl->fl_owner = current->files;
+	fl->fl_pid   = (pid_t)lock->svid;
+	fl->fl_flags = FL_POSIX;
+	fl->fl_type  = F_RDLCK;		/* as good as anything else */
+	p = xdr_decode_hyper(p, &start);
+	p = xdr_decode_hyper(p, &len);
+	end = start + len - 1;
+
+	fl->fl_start = s64_to_loff_t(start);
+
+	if (len == 0 || end < 0)
+		fl->fl_end = OFFSET_MAX;
+	else
+		fl->fl_end = s64_to_loff_t(end);
+	return p;
+}
+
+/*
+ * Encode result of a TEST/TEST_MSG call
+ */
+static __be32 *
+nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
+{
+	s64		start, len;
+
+	dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
+	if (!(p = nlm4_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_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);
+		
+		p = xdr_encode_hyper(p, start);
+		p = xdr_encode_hyper(p, len);
+		dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
+			resp->status, (int)resp->lock.svid, fl->fl_type,
+			(long long)fl->fl_start,  (long long)fl->fl_end);
+	}
+
+	dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
+	return p;
+}
+
+
+/*
+ * First, the server side XDR functions
+ */
+int
+nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_args *argp = rqstp->rq_argp;
+	u32	exclusive;
+
+	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+		return 0;
+
+	exclusive = ntohl(*p++);
+	if (!(p = nlm4_decode_lock(p, &argp->lock)))
+		return 0;
+	if (exclusive)
+		argp->lock.fl.fl_type = F_WRLCK;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_res *resp = rqstp->rq_resp;
+
+	if (!(p = nlm4_encode_testres(p, resp)))
+		return 0;
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_args *argp = rqstp->rq_argp;
+	u32	exclusive;
+
+	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+		return 0;
+	argp->block  = ntohl(*p++);
+	exclusive    = ntohl(*p++);
+	if (!(p = nlm4_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
+nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_args *argp = rqstp->rq_argp;
+	u32	exclusive;
+
+	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
+		return 0;
+	argp->block = ntohl(*p++);
+	exclusive = ntohl(*p++);
+	if (!(p = nlm4_decode_lock(p, &argp->lock)))
+		return 0;
+	if (exclusive)
+		argp->lock.fl.fl_type = F_WRLCK;
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_args *argp = rqstp->rq_argp;
+
+	if (!(p = nlm4_decode_cookie(p, &argp->cookie))
+	 || !(p = nlm4_decode_lock(p, &argp->lock)))
+		return 0;
+	argp->lock.fl.fl_type = F_UNLCK;
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_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;
+	lock->fl.fl_pid = (pid_t)lock->svid;
+
+	if (!(p = nlm4_decode_cookie(p, &argp->cookie))
+	 || !(p = xdr_decode_string_inplace(p, &lock->caller,
+					    &lock->len, NLM_MAXSTRLEN))
+	 || !(p = nlm4_decode_fh(p, &lock->fh))
+	 || !(p = nlm4_decode_oh(p, &lock->oh)))
+		return 0;
+	argp->fsm_mode = ntohl(*p++);
+	argp->fsm_access = ntohl(*p++);
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_res *resp = rqstp->rq_resp;
+
+	if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
+		return 0;
+	*p++ = resp->status;
+	*p++ = xdr_zero;		/* sequence argument */
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_res *resp = rqstp->rq_resp;
+
+	if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
+		return 0;
+	*p++ = resp->status;
+	return xdr_ressize_check(rqstp, p);
+}
+
+int
+nlm4svc_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
+nlm4svc_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
+nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nlm_res *resp = rqstp->rq_argp;
+
+	if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
+		return 0;
+	resp->status = *p++;
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
+{
+	return xdr_argsize_check(rqstp, p);
+}
+
+int
+nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
+{
+	return xdr_ressize_check(rqstp, p);
+}