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diff --git a/sys/modules/Makefile b/sys/modules/Makefile
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -276,6 +276,7 @@
nfsd \
nfslockd \
nfssvc \
+ nlsysevent \
nge \
nmdm \
nullfs \
diff --git a/sys/modules/nlsysevent/Makefile b/sys/modules/nlsysevent/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/nlsysevent/Makefile
@@ -0,0 +1,11 @@
+# $FreeBSD$
+
+.PATH: ${SRCTOP}/sys/netlink/
+
+KMOD= nlsysevent
+SRCS= netlink_sysevent.c
+
+CFLAGS+= -I${SRCTOP}/sys/contrib/netlink
+EXPORT_SYMS= yes
+
+.include <bsd.kmod.mk>
diff --git a/sys/netlink/netlink_sysevent.h b/sys/netlink/netlink_sysevent.h
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_sysevent.h
@@ -0,0 +1,49 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Baptiste Daroussin <bapt@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _NETLINK_SYSEVENT_H_
+#define _NETLINK_SYSEVENT_H_
+
+enum {
+ NLSE_UNSPEC = 0,
+ NLSE_SYSTEM = 1,
+ NLSE_SUBSYSTEM = 2,
+ NLSE_TYPE = 3,
+ NLSE_DATA = 4,
+ __NLSE_MAX,
+};
+#define NLSE_MAX (__NLSE_MAX -1)
+
+/* available commands */
+enum {
+ NLSE_CMD_UNSPEC = 0,
+ NLSE_CMD_NEWEVENT = 1,
+ __NLSE_CMD_MAX,
+};
+#define NLSE_CMD_MAX (__NLSE_CMD_MAX -1)
+
+#endif
diff --git a/sys/netlink/netlink_sysevent.c b/sys/netlink/netlink_sysevent.c
new file mode 100644
--- /dev/null
+++ b/sys/netlink/netlink_sysevent.c
@@ -0,0 +1,169 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Baptiste Daroussin <bapt@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/devctl.h>
+#include <sys/errno.h>
+#include <sys/module.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <net/vnet.h>
+#include <netlink/netlink.h>
+#include <netlink/netlink_ctl.h>
+#include <netlink/netlink_generic.h>
+
+#define DEBUG_MOD_NAME nl_sysevent
+#define DEBUG_MAX_LEVEL LOG_DEBUG3
+#include <netlink/netlink_debug.h>
+_DECLARE_DEBUG(LOG_DEBUG3);
+
+#include "netlink_sysevent.h"
+
+#define CTRL_FAMILY_NAME "nlsysevent"
+static uint32_t family_id;
+
+static struct sysevent {
+ uint32_t id;
+ const char *name;
+} sysevents [] = {
+ { 0, "ACPI"},
+ { 0, "AEON"},
+ { 0, "CAM"},
+ { 0, "CARP"},
+ { 0, "coretemp"},
+ { 0, "DEVFS"},
+ { 0, "ETHERNET"},
+ { 0, "GEOM"},
+ { 0, "HYPERV_NIC_VF"},
+ { 0, "IFNET"},
+ { 0, "INFINIBAND"},
+ { 0, "kern"},
+ { 0, "kernel"},
+ { 0, "nvme"},
+ { 0, "PMU"},
+ { 0, "RCTL"},
+ { 0, "USB"},
+ { 0, "VFS"},
+ { 0, "VT"},
+ { 0, "ZFS"},
+};
+
+static void
+sysevent_send_to_group(uint32_t gid, const char *system, const char *subsystem,
+ const char *type, const char *data)
+{
+ struct nl_writer nw = {};
+ struct nlmsghdr hdr = { .nlmsg_type = family_id };
+ struct genlmsghdr *ghdr;
+
+ if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_GENERIC, gid)) {
+ printf("nlsysevent: error allocating group writer");
+ return;
+ }
+ if (!nlmsg_reply(&nw, &hdr, sizeof(struct genlmsghdr)))
+ return;
+
+ ghdr = nlmsg_reserve_object(&nw, struct genlmsghdr);
+ if (ghdr == NULL) {
+ NL_LOG(LOG_ERR, "nlsysevent: unable to allocate memory");
+ return;
+ }
+ ghdr->version = 0;
+ ghdr->cmd = NLSE_CMD_NEWEVENT;
+ ghdr->reserved = 0;
+ nlattr_add_string(&nw, NLSE_SYSTEM, system);
+ nlattr_add_string(&nw, NLSE_SUBSYSTEM, subsystem);
+ nlattr_add_string(&nw, NLSE_TYPE, type);
+ if (data != NULL)
+ nlattr_add_string(&nw, NLSE_DATA, data);
+ nlmsg_end(&nw);
+ nlmsg_flush(&nw);
+}
+
+static void
+sysevent_send(const char *system, const char *subsystem, const char *type,
+ const char *data)
+{
+ uint32_t group_id = 0;
+
+ for (size_t i = 0; nitems(sysevents); i++) {
+ if (strcmp(sysevents[i].name, system) == 0) {
+ group_id = sysevents[i].id;
+ break;
+ }
+ }
+
+ if (group_id == 0) {
+ NL_LOG(LOG_ERR, "nlsysevent: unknown system for '%s'\n",
+ system);
+ return;
+ }
+ CURVNET_SET(vnet0);
+ sysevent_send_to_group(group_id, system, subsystem, type, data);
+ CURVNET_RESTORE();
+}
+
+static void
+nlsysevent_load(void)
+{
+ devctl_set_notify_hook(sysevent_send);
+ family_id = genl_register_family(CTRL_FAMILY_NAME, 0, 2, CTRL_ATTR_MAX);
+ for (size_t i = 0; i < nitems(sysevents); i++)
+ sysevents[i].id = genl_register_group(CTRL_FAMILY_NAME, sysevents[i].name);
+}
+
+static void
+nlsysevent_unload(void)
+{
+ devctl_unset_notify_hook();
+ genl_unregister_family(CTRL_FAMILY_NAME);
+}
+
+static int
+nlsysevent_loader(module_t mod __unused, int what, void *priv __unused)
+{
+ int err = 0;
+
+ switch (what) {
+ case MOD_LOAD:
+ nlsysevent_load();
+ break;
+ case MOD_UNLOAD:
+ nlsysevent_unload();
+ break;
+ default:
+ err = EOPNOTSUPP;
+ break;
+ }
+ return (err);
+}
+static moduledata_t nlsysevent_mod = { "nlsysevent", nlsysevent_loader, NULL};
+
+DECLARE_MODULE(nlsysevent, nlsysevent_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+MODULE_DEPEND(nlsysevent, netlink, 1, 1, 1);
+MODULE_VERSION(nlsysevent, 1);

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