[PATCH net-next v3 11/11] wireguard: netlink: generate netlink code

Asbjørn Sloth Tønnesen
2025-11-05T18:32:59Z

This patch adopts netlink policy and command definitions as
generated by ynl-gen, thus completing the conversion to YNL.

Given that the old and new policy is functionally identical, and
just moved to a new file, then it serves to verify that the policy
in the spec in identical to the previous policy code.

The new files are covered by drivers/net/wireguard/ pattern in
MAINTAINERS.

No behavioural changes intended.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
---
drivers/net/wireguard/Makefile | 1 +
drivers/net/wireguard/netlink.c | 64 +++---------------------
drivers/net/wireguard/netlink_gen.c | 77 +++++++++++++++++++++++++++++
drivers/net/wireguard/netlink_gen.h | 29 +++++++++++
4 files changed, 114 insertions(+), 57 deletions(-)
create mode 100644 drivers/net/wireguard/netlink_gen.c
create mode 100644 drivers/net/wireguard/netlink_gen.h

diff --git a/drivers/net/wireguard/Makefile b/drivers/net/wireguard/Makefile
index dbe1f8514efc..ae4b479cddbd 100644
--- a/drivers/net/wireguard/Makefile
+++ b/drivers/net/wireguard/Makefile
@@ -14,4 +14,5 @@ wireguard-y += allowedips.o
wireguard-y += ratelimiter.o
wireguard-y += cookie.o
wireguard-y += netlink.o
+wireguard-y += netlink_gen.o
obj-$(CONFIG_WIREGUARD) := wireguard.o
diff --git a/drivers/net/wireguard/netlink.c b/drivers/net/wireguard/netlink.c
index ff1549fe55e2..6a7e522e3a78 100644
--- a/drivers/net/wireguard/netlink.c
+++ b/drivers/net/wireguard/netlink.c
@@ -9,6 +9,7 @@
#include "socket.h"
#include "queueing.h"
#include "messages.h"
+#include "netlink_gen.h"

#include <uapi/linux/wireguard.h>

@@ -18,39 +19,6 @@
#include <crypto/utils.h>

static struct genl_family genl_family;
-static const struct nla_policy peer_policy[WGPEER_A_MAX + 1];
-static const struct nla_policy allowedip_policy[WGALLOWEDIP_A_MAX + 1];
-
-static const struct nla_policy device_policy[WGDEVICE_A_MAX + 1] = {
- [WGDEVICE_A_IFINDEX] = { .type = NLA_U32 },
- [WGDEVICE_A_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
- [WGDEVICE_A_PRIVATE_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
- [WGDEVICE_A_PUBLIC_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
- [WGDEVICE_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x1),
- [WGDEVICE_A_LISTEN_PORT] = { .type = NLA_U16 },
- [WGDEVICE_A_FWMARK] = { .type = NLA_U32 },
- [WGDEVICE_A_PEERS] = NLA_POLICY_NESTED_ARRAY(peer_policy),
-};
-
-static const struct nla_policy peer_policy[WGPEER_A_MAX + 1] = {
- [WGPEER_A_PUBLIC_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
- [WGPEER_A_PRESHARED_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
- [WGPEER_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x7),
- [WGPEER_A_ENDPOINT] = NLA_POLICY_MIN_LEN(sizeof(struct sockaddr)),
- [WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL] = { .type = NLA_U16 },
- [WGPEER_A_LAST_HANDSHAKE_TIME] = NLA_POLICY_EXACT_LEN(sizeof(struct __kernel_timespec)),
- [WGPEER_A_RX_BYTES] = { .type = NLA_U64 },
- [WGPEER_A_TX_BYTES] = { .type = NLA_U64 },
- [WGPEER_A_ALLOWEDIPS] = NLA_POLICY_NESTED_ARRAY(allowedip_policy),
- [WGPEER_A_PROTOCOL_VERSION] = { .type = NLA_U32 }
-};
-
-static const struct nla_policy allowedip_policy[WGALLOWEDIP_A_MAX + 1] = {
- [WGALLOWEDIP_A_FAMILY] = { .type = NLA_U16 },
- [WGALLOWEDIP_A_IPADDR] = NLA_POLICY_MIN_LEN(sizeof(struct in_addr)),
- [WGALLOWEDIP_A_CIDR_MASK] = { .type = NLA_U8 },
- [WGALLOWEDIP_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x1),
-};

static struct wg_device *lookup_interface(struct nlattr **attrs,
struct sk_buff *skb)
@@ -199,7 +167,7 @@ get_peer(struct wg_peer *peer, struct sk_buff *skb, struct dump_ctx *ctx)
return -EMSGSIZE;
}

-static int wireguard_nl_get_device_start(struct netlink_callback *cb)
+int wireguard_nl_get_device_start(struct netlink_callback *cb)
{
struct wg_device *wg;

@@ -210,8 +178,8 @@ static int wireguard_nl_get_device_start(struct netlink_callback *cb)
return 0;
}

-static int wireguard_nl_get_device_dumpit(struct sk_buff *skb,
- struct netlink_callback *cb)
+int wireguard_nl_get_device_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb)
{
struct wg_peer *peer, *next_peer_cursor;
struct dump_ctx *ctx = DUMP_CTX(cb);
@@ -305,7 +273,7 @@ static int wireguard_nl_get_device_dumpit(struct sk_buff *skb,
*/
}

-static int wireguard_nl_get_device_done(struct netlink_callback *cb)
+int wireguard_nl_get_device_done(struct netlink_callback *cb)
{
struct dump_ctx *ctx = DUMP_CTX(cb);

@@ -503,8 +471,8 @@ static int set_peer(struct wg_device *wg, struct nlattr **attrs)
return ret;
}

-static int wireguard_nl_set_device_doit(struct sk_buff *skb,
- struct genl_info *info)
+int wireguard_nl_set_device_doit(struct sk_buff *skb,
+ struct genl_info *info)
{
struct wg_device *wg = lookup_interface(info->attrs, skb);
u32 flags = 0;
@@ -618,24 +586,6 @@ static int wireguard_nl_set_device_doit(struct sk_buff *skb,
return ret;
}

-static const struct genl_split_ops wireguard_nl_ops[] = {
- {
- .cmd = WG_CMD_GET_DEVICE,
- .start = wireguard_nl_get_device_start,
- .dumpit = wireguard_nl_get_device_dumpit,
- .done = wireguard_nl_get_device_done,
- .policy = device_policy,
- .maxattr = WGDEVICE_A_PEERS,
- .flags = GENL_UNS_ADMIN_PERM | GENL_CMD_CAP_DUMP,
- }, {
- .cmd = WG_CMD_SET_DEVICE,
- .doit = wireguard_nl_set_device_doit,
- .policy = device_policy,
- .maxattr = WGDEVICE_A_PEERS,
- .flags = GENL_UNS_ADMIN_PERM | GENL_CMD_CAP_DO,
- }
-};
-
static struct genl_family genl_family __ro_after_init = {
.split_ops = wireguard_nl_ops,
.n_split_ops = ARRAY_SIZE(wireguard_nl_ops),
diff --git a/drivers/net/wireguard/netlink_gen.c b/drivers/net/wireguard/netlink_gen.c
new file mode 100644
index 000000000000..f95fa133778f
--- /dev/null
+++ b/drivers/net/wireguard/netlink_gen.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/wireguard.yaml */
+/* YNL-GEN kernel source */
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include "netlink_gen.h"
+
+#include <uapi/linux/wireguard.h>
+#include <linux/time_types.h>
+
+/* Common nested types */
+const struct nla_policy wireguard_wgallowedip_nl_policy[WGALLOWEDIP_A_FLAGS + 1] = {
+ [WGALLOWEDIP_A_FAMILY] = { .type = NLA_U16, },
+ [WGALLOWEDIP_A_IPADDR] = NLA_POLICY_MIN_LEN(4),
+ [WGALLOWEDIP_A_CIDR_MASK] = { .type = NLA_U8, },
+ [WGALLOWEDIP_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x1),
+};
+
+const struct nla_policy wireguard_wgpeer_nl_policy[WGPEER_A_PROTOCOL_VERSION + 1] = {
+ [WGPEER_A_PUBLIC_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
+ [WGPEER_A_PRESHARED_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
+ [WGPEER_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x7),
+ [WGPEER_A_ENDPOINT] = NLA_POLICY_MIN_LEN(16),
+ [WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL] = { .type = NLA_U16, },
+ [WGPEER_A_LAST_HANDSHAKE_TIME] = NLA_POLICY_EXACT_LEN(16),
+ [WGPEER_A_RX_BYTES] = { .type = NLA_U64, },
+ [WGPEER_A_TX_BYTES] = { .type = NLA_U64, },
+ [WGPEER_A_ALLOWEDIPS] = NLA_POLICY_NESTED_ARRAY(wireguard_wgallowedip_nl_policy),
+ [WGPEER_A_PROTOCOL_VERSION] = { .type = NLA_U32, },
+};
+
+/* WG_CMD_GET_DEVICE - dump */
+static const struct nla_policy wireguard_get_device_nl_policy[WGDEVICE_A_PEERS + 1] = {
+ [WGDEVICE_A_IFINDEX] = { .type = NLA_U32, },
+ [WGDEVICE_A_IFNAME] = { .type = NLA_NUL_STRING, .len = 15, },
+ [WGDEVICE_A_PRIVATE_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
+ [WGDEVICE_A_PUBLIC_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
+ [WGDEVICE_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x1),
+ [WGDEVICE_A_LISTEN_PORT] = { .type = NLA_U16, },
+ [WGDEVICE_A_FWMARK] = { .type = NLA_U32, },
+ [WGDEVICE_A_PEERS] = NLA_POLICY_NESTED_ARRAY(wireguard_wgpeer_nl_policy),
+};
+
+/* WG_CMD_SET_DEVICE - do */
+static const struct nla_policy wireguard_set_device_nl_policy[WGDEVICE_A_PEERS + 1] = {
+ [WGDEVICE_A_IFINDEX] = { .type = NLA_U32, },
+ [WGDEVICE_A_IFNAME] = { .type = NLA_NUL_STRING, .len = 15, },
+ [WGDEVICE_A_PRIVATE_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
+ [WGDEVICE_A_PUBLIC_KEY] = NLA_POLICY_EXACT_LEN(WG_KEY_LEN),
+ [WGDEVICE_A_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x1),
+ [WGDEVICE_A_LISTEN_PORT] = { .type = NLA_U16, },
+ [WGDEVICE_A_FWMARK] = { .type = NLA_U32, },
+ [WGDEVICE_A_PEERS] = NLA_POLICY_NESTED_ARRAY(wireguard_wgpeer_nl_policy),
+};
+
+/* Ops table for wireguard */
+const struct genl_split_ops wireguard_nl_ops[2] = {
+ {
+ .cmd = WG_CMD_GET_DEVICE,
+ .start = wireguard_nl_get_device_start,
+ .dumpit = wireguard_nl_get_device_dumpit,
+ .done = wireguard_nl_get_device_done,
+ .policy = wireguard_get_device_nl_policy,
+ .maxattr = WGDEVICE_A_PEERS,
+ .flags = GENL_UNS_ADMIN_PERM | GENL_CMD_CAP_DUMP,
+ },
+ {
+ .cmd = WG_CMD_SET_DEVICE,
+ .doit = wireguard_nl_set_device_doit,
+ .policy = wireguard_set_device_nl_policy,
+ .maxattr = WGDEVICE_A_PEERS,
+ .flags = GENL_UNS_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+};
diff --git a/drivers/net/wireguard/netlink_gen.h b/drivers/net/wireguard/netlink_gen.h
new file mode 100644
index 000000000000..e635b1f5f0df
--- /dev/null
+++ b/drivers/net/wireguard/netlink_gen.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/* Documentation/netlink/specs/wireguard.yaml */
+/* YNL-GEN kernel header */
+
+#ifndef _LINUX_WIREGUARD_GEN_H
+#define _LINUX_WIREGUARD_GEN_H
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include <uapi/linux/wireguard.h>
+#include <linux/time_types.h>
+
+/* Common nested types */
+extern const struct nla_policy wireguard_wgallowedip_nl_policy[WGALLOWEDIP_A_FLAGS + 1];
+extern const struct nla_policy wireguard_wgpeer_nl_policy[WGPEER_A_PROTOCOL_VERSION + 1];
+
+/* Ops table for wireguard */
+extern const struct genl_split_ops wireguard_nl_ops[2];
+
+int wireguard_nl_get_device_start(struct netlink_callback *cb);
+int wireguard_nl_get_device_done(struct netlink_callback *cb);
+
+int wireguard_nl_get_device_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb);
+int wireguard_nl_set_device_doit(struct sk_buff *skb, struct genl_info *info);
+
+#endif /* _LINUX_WIREGUARD_GEN_H */
--
2.51.0