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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 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>
#include <netlink/netlink_sysevent.h>
#define DEBUG_MOD_NAME nl_sysevent
#define DEBUG_MAX_LEVEL LOG_DEBUG3
#include <netlink/netlink_debug.h>
_DECLARE_DEBUG(LOG_INFO);
MALLOC_DEFINE(M_NLSE, "nlsysevent", "Memory used for Netlink sysevent");
#define NLSE_FAMILY_NAME "nlsysevent"
static uint32_t ctrl_family_id;
#define MAX_SYSEVENT_GROUPS 64
static struct sysevent_group {
char *name;
uint32_t id;
} sysevent_groups[MAX_SYSEVENT_GROUPS] = {};
static void
sysevent_write(struct sysevent_group *se, const char *subsystem, const char *type,
const char *data)
{
struct nl_writer nw = {};
if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_GENERIC, se->id)) {
NL_LOG(LOG_DEBUG, "error allocating group writer");
return;
}
struct nlmsghdr hdr = { .nlmsg_type = ctrl_family_id };
if (!nlmsg_reply(&nw, &hdr, sizeof(struct genlmsghdr))) {
return;
}
struct genlmsghdr *ghdr = nlmsg_reserve_object(&nw, struct genlmsghdr);
if (ghdr == NULL) {
NL_LOG(LOG_DEBUG, "unable to allocate memory");
return;
}
ghdr->version = 0;
ghdr->cmd = 0;
ghdr->reserved = 0;
nlattr_add_string(&nw, NLSE_ATTR_SYSTEM, se->name);
nlattr_add_string(&nw, NLSE_ATTR_SUBSYSTEM, subsystem);
nlattr_add_string(&nw, NLSE_ATTR_TYPE, type);
if (data != NULL)
nlattr_add_string(&nw, NLSE_ATTR_DATA, data);
nlmsg_end(&nw);
nlmsg_flush(&nw);
}
static void
sysevent_send(const char *system, const char *subsystem, const char *type,
const char *data)
{
struct sysevent_group *se = NULL;
for (size_t i = 0; i < MAX_SYSEVENT_GROUPS; i++) {
if (sysevent_groups[i].name == NULL) {
sysevent_groups[i].name = strdup(system, M_NLSE);
sysevent_groups[i].id = genl_register_group(NLSE_FAMILY_NAME,
system);
se = &sysevent_groups[i];
break;
}
if (strcmp(sysevent_groups[i].name, system) == 0) {
se = &sysevent_groups[i];
break;
}
}
if (se == NULL) {
NL_LOG(LOG_WARNING, "impossible to add the event %s, "
"too many events\n", system);
return;
}
CURVNET_SET(vnet0);
sysevent_write(se, subsystem, type, data);
CURVNET_RESTORE();
}
static void
nlsysevent_load(void)
{
devctl_set_notify_hook(sysevent_send);
ctrl_family_id = genl_register_family(NLSE_FAMILY_NAME, 0, 2, NLSE_ATTR_MAX);
for (size_t i = 0; i < nitems(devctl_systems); i++) {
if (i >= MAX_SYSEVENT_GROUPS) {
NL_LOG(LOG_WARNING, "impossible to add the event %s, too many events\n", devctl_systems[i]);
continue;
}
sysevent_groups[i].name = strdup(devctl_systems[i], M_NLSE);
sysevent_groups[i].id = genl_register_group(NLSE_FAMILY_NAME, devctl_systems[i]);
}
}
static void
nlsysevent_unload(void)
{
devctl_unset_notify_hook();
genl_unregister_family(NLSE_FAMILY_NAME);
for (size_t i = 0; i < MAX_SYSEVENT_GROUPS; i++) {
if (sysevent_groups[i].name == NULL)
break;
free(sysevent_groups[i].name, M_NLSE);
}
}
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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