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/*
* Copyright (c) 2023 Balazs Scheidler <bazsi77@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "ebpf-reuseport.h"
#include "modules/afsocket/afsocket-signals.h"
typedef struct _EBPFReusePort
{
LogDriverPlugin super;
struct random_kern *random;
gint number_of_sockets;
} EBPFReusePort;
#include "random.skel.c"
void
ebpf_reuseport_set_sockets(LogDriverPlugin *s, gint number_of_sockets)
{
EBPFReusePort *self = (EBPFReusePort *) s;
self->number_of_sockets = number_of_sockets;
}
static void
_slot_setup_socket(EBPFReusePort *self, AFSocketSetupSocketSignalData *data)
{
int bpf_fd = bpf_program__fd(self->random->progs.random_choice);
if (bpf_fd < 0)
{
msg_error("ebpf-reuseport(): setsockopt(SO_ATTACH_REUSEPORT_EBPF) returned error",
evt_tag_errno("error", errno));
goto error;
}
if (setsockopt(data->sock, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &bpf_fd, sizeof(bpf_fd)) < 0)
{
msg_error("ebpf-reuseport(): setsockopt(SO_ATTACH_REUSEPORT_EBPF) returned error",
evt_tag_errno("error", errno));
goto error;
}
msg_debug("ebpf-reuseport(): eBPF reuseport group randomizer applied",
evt_tag_int("sock", data->sock));
return;
error:
data->failure = TRUE;
}
static gboolean
_attach(LogDriverPlugin *s, LogDriver *driver)
{
EBPFReusePort *self = (EBPFReusePort *)s;
self->random = random_kern__open_and_load();
if (!self->random)
{
msg_error("ebpf-reuseport(): Unable to load eBPF program to the kernel");
return FALSE;
}
self->random->bss->number_of_sockets = self->number_of_sockets;
g_assert(s->signal_connector == NULL);
s->signal_connector = signal_slot_connector_ref(driver->super.signal_slot_connector);
CONNECT(s->signal_connector, signal_afsocket_setup_socket, _slot_setup_socket, self);
return TRUE;
}
static void
_detach(LogDriverPlugin *s, LogDriver *driver)
{
EBPFReusePort *self = (EBPFReusePort *)s;
DISCONNECT(s->signal_connector, signal_afsocket_setup_socket, _slot_setup_socket, self);
signal_slot_connector_unref(s->signal_connector);
s->signal_connector = NULL;
}
static void
_free(LogDriverPlugin *s)
{
EBPFReusePort *self = (EBPFReusePort *) s;
if (self->random)
random_kern__destroy(self->random);
log_driver_plugin_free_method(s);
}
LogDriverPlugin *
ebpf_reuseport_new(void)
{
EBPFReusePort *self = g_new0(EBPFReusePort, 1);
log_driver_plugin_init_instance(&self->super, "ebpf-reuseport");
self->super.attach = _attach;
self->super.detach = _detach;
self->super.free_fn = _free;
self->number_of_sockets = 0;
return &self->super;
}
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