NFSD: introduce netlink stubs

Generate stubs and uAPI for nfsd netlink protocol. For the moment,
the new protocol has one operation: rpc_status.

The generated header and source files are created by running:

  tools/net/ynl/ynl-regen.sh

Tested-by: Jeff Layton <[email protected]>
Signed-off-by: Lorenzo Bianconi <[email protected]>
Acked-by: Jeff Layton <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>

Documentation/netlink/specs/nfsd.yaml

@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+
+name: nfsd
+protocol: genetlink
+uapi-header: linux/nfsd_netlink.h
+
+doc: NFSD configuration over generic netlink.
+
+attribute-sets:
+ -
+ name: rpc-status
+ attributes:
+ -
+ name: xid
+ type: u32
+ byte-order: big-endian
+ -
+ name: flags
+ type: u32
+ -
+ name: prog
+ type: u32
+ -
+ name: version
+ type: u8
+ -
+ name: proc
+ type: u32
+ -
+ name: service_time
+ type: s64
+ -
+ name: pad
+ type: pad
+ -
+ name: saddr4
+ type: u32
+ byte-order: big-endian
+ display-hint: ipv4
+ -
+ name: daddr4
+ type: u32
+ byte-order: big-endian
+ display-hint: ipv4
+ -
+ name: saddr6
+ type: binary
+ display-hint: ipv6
+ -
+ name: daddr6
+ type: binary
+ display-hint: ipv6
+ -
+ name: sport
+ type: u16
+ byte-order: big-endian
+ -
+ name: dport
+ type: u16
+ byte-order: big-endian
+ -
+ name: compound-ops
+ type: u32
+ multi-attr: true
+
+operations:
+ list:
+ -
+ name: rpc-status-get
+ doc: dump pending nfsd rpc
+ attribute-set: rpc-status
+ dump:
+ pre: nfsd-nl-rpc-status-get-start
+ post: nfsd-nl-rpc-status-get-done
+ reply:
+ attributes:
+ - xid
+ - flags
+ - prog
+ - version
+ - proc
+ - service_time
+ - saddr4
+ - daddr4
+ - saddr6
+ - daddr6
+ - sport
+ - dport
+ - compound-ops

fs/nfsd/Makefile

@@ -12,7 +12,8 @@ nfsd-y += trace.o
 
 nfsd-y += nfssvc.o nfsctl.o nfsfh.o vfs.o \
  export.o auth.o lockd.o nfscache.o \
- stats.o filecache.o nfs3proc.o nfs3xdr.o
+ stats.o filecache.o nfs3proc.o nfs3xdr.o \
+ netlink.o
 nfsd-$(CONFIG_NFSD_V2) += nfsproc.o nfsxdr.o
 nfsd-$(CONFIG_NFSD_V2_ACL) += nfs2acl.o
 nfsd-$(CONFIG_NFSD_V3_ACL) += nfs3acl.o

fs/nfsd/netlink.c

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/nfsd.yaml */
+/* YNL-GEN kernel source */
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include "netlink.h"
+
+#include <uapi/linux/nfsd_netlink.h>
+
+/* Ops table for nfsd */
+static const struct genl_split_ops nfsd_nl_ops[] = {
+ {
+ .cmd = NFSD_CMD_RPC_STATUS_GET,
+ .start = nfsd_nl_rpc_status_get_start,
+ .dumpit = nfsd_nl_rpc_status_get_dumpit,
+ .done = nfsd_nl_rpc_status_get_done,
+ .flags = GENL_CMD_CAP_DUMP,
+ },
+};
+
+struct genl_family nfsd_nl_family __ro_after_init = {
+ .name = NFSD_FAMILY_NAME,
+ .version = NFSD_FAMILY_VERSION,
+ .netnsok = true,
+ .parallel_ops = true,
+ .module = THIS_MODULE,
+ .split_ops = nfsd_nl_ops,
+ .n_split_ops = ARRAY_SIZE(nfsd_nl_ops),
+};

fs/nfsd/netlink.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/nfsd.yaml */
+/* YNL-GEN kernel header */
+
+#ifndef _LINUX_NFSD_GEN_H
+#define _LINUX_NFSD_GEN_H
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include <uapi/linux/nfsd_netlink.h>
+
+int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb);
+int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb);
+
+int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb);
+
+extern struct genl_family nfsd_nl_family;
+
+#endif /* _LINUX_NFSD_GEN_H */

fs/nfsd/nfsctl.c

@@ -26,6 +26,7 @@
 #include "pnfs.h"
 #include "filecache.h"
 #include "trace.h"
+#include "netlink.h"
 
 /*
  * We have a single directory with several nodes in it.
@@ -1495,6 +1496,22 @@ static int create_proc_exports_entry(void)
 
 unsigned int nfsd_net_id;
 
+int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
+{
+ return 0;
+}
+
+int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ return 0;
+}
+
+int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
+{
+ return 0;
+}
+
 /**
  * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
  * @net: a freshly-created network namespace

include/uapi/linux/nfsd_netlink.h

@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/nfsd.yaml */
+/* YNL-GEN uapi header */
+
+#ifndef _UAPI_LINUX_NFSD_H
+#define _UAPI_LINUX_NFSD_H
+
+#define NFSD_FAMILY_NAME "nfsd"
+#define NFSD_FAMILY_VERSION 1
+
+enum {
+ NFSD_A_RPC_STATUS_XID = 1,
+ NFSD_A_RPC_STATUS_FLAGS,
+ NFSD_A_RPC_STATUS_PROG,
+ NFSD_A_RPC_STATUS_VERSION,
+ NFSD_A_RPC_STATUS_PROC,
+ NFSD_A_RPC_STATUS_SERVICE_TIME,
+ NFSD_A_RPC_STATUS_PAD,
+ NFSD_A_RPC_STATUS_SADDR4,
+ NFSD_A_RPC_STATUS_DADDR4,
+ NFSD_A_RPC_STATUS_SADDR6,
+ NFSD_A_RPC_STATUS_DADDR6,
+ NFSD_A_RPC_STATUS_SPORT,
+ NFSD_A_RPC_STATUS_DPORT,
+ NFSD_A_RPC_STATUS_COMPOUND_OPS,
+
+ __NFSD_A_RPC_STATUS_MAX,
+ NFSD_A_RPC_STATUS_MAX = (__NFSD_A_RPC_STATUS_MAX - 1)
+};
+
+enum {
+ NFSD_CMD_RPC_STATUS_GET = 1,
+
+ __NFSD_CMD_MAX,
+ NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1)
+};
+
+#endif /* _UAPI_LINUX_NFSD_H */