qemu-e2k/net/filter-mirror.c

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/*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
* Copyright (c) 2016 FUJITSU LIMITED
* Copyright (c) 2016 Intel Corporation
*
* Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "net/filter.h"
#include "net/net.h"
#include "qapi/error.h"
#include "qom/object.h"
#include "qemu/main-loop.h"
#include "qemu/error-report.h"
#include "trace.h"
#include "chardev/char-fe.h"
#include "qemu/iov.h"
#include "qemu/sockets.h"
#include "block/aio-wait.h"
#define TYPE_FILTER_MIRROR "filter-mirror"
typedef struct MirrorState MirrorState;
DECLARE_INSTANCE_CHECKER(MirrorState, FILTER_MIRROR,
TYPE_FILTER_MIRROR)
#define TYPE_FILTER_REDIRECTOR "filter-redirector"
DECLARE_INSTANCE_CHECKER(MirrorState, FILTER_REDIRECTOR,
TYPE_FILTER_REDIRECTOR)
#define REDIRECTOR_MAX_LEN NET_BUFSIZE
struct MirrorState {
NetFilterState parent_obj;
char *indev;
char *outdev;
CharBackend chr_in;
CharBackend chr_out;
SocketReadState rs;
bool vnet_hdr;
};
typedef struct FilterSendCo {
MirrorState *s;
char *buf;
ssize_t size;
bool done;
int ret;
} FilterSendCo;
static int _filter_send(MirrorState *s,
char *buf,
ssize_t size)
{
NetFilterState *nf = NETFILTER(s);
int ret = 0;
uint32_t len = 0;
len = htonl(size);
ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)&len, sizeof(len));
if (ret != sizeof(len)) {
goto err;
}
if (s->vnet_hdr) {
/*
* If vnet_hdr = on, we send vnet header len to make other
* module(like colo-compare) know how to parse net
* packet correctly.
*/
ssize_t vnet_hdr_len;
vnet_hdr_len = nf->netdev->vnet_hdr_len;
len = htonl(vnet_hdr_len);
ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)&len, sizeof(len));
if (ret != sizeof(len)) {
goto err;
}
}
ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)buf, size);
if (ret != size) {
goto err;
}
return size;
err:
return ret < 0 ? ret : -EIO;
}
static void coroutine_fn filter_send_co(void *opaque)
{
FilterSendCo *data = opaque;
data->ret = _filter_send(data->s, data->buf, data->size);
data->done = true;
g_free(data->buf);
aio_wait_kick();
}
static int filter_send(MirrorState *s,
const struct iovec *iov,
int iovcnt)
{
ssize_t size = iov_size(iov, iovcnt);
char *buf = NULL;
if (!size) {
return 0;
}
buf = g_malloc(size);
iov_to_buf(iov, iovcnt, 0, buf, size);
FilterSendCo data = {
.s = s,
.size = size,
.buf = buf,
.ret = 0,
};
Coroutine *co = qemu_coroutine_create(filter_send_co, &data);
qemu_coroutine_enter(co);
while (!data.done) {
aio_poll(qemu_get_aio_context(), true);
}
return data.ret;
}
static void redirector_to_filter(NetFilterState *nf,
const uint8_t *buf,
int len)
{
struct iovec iov = {
.iov_base = (void *)buf,
.iov_len = len,
};
if (nf->direction == NET_FILTER_DIRECTION_ALL ||
nf->direction == NET_FILTER_DIRECTION_TX) {
qemu_netfilter_pass_to_next(nf->netdev, 0, &iov, 1, nf);
}
if (nf->direction == NET_FILTER_DIRECTION_ALL ||
nf->direction == NET_FILTER_DIRECTION_RX) {
qemu_netfilter_pass_to_next(nf->netdev->peer, 0, &iov, 1, nf);
}
}
static int redirector_chr_can_read(void *opaque)
{
return REDIRECTOR_MAX_LEN;
}
static void redirector_chr_read(void *opaque, const uint8_t *buf, int size)
{
NetFilterState *nf = opaque;
MirrorState *s = FILTER_REDIRECTOR(nf);
int ret;
ret = net_fill_rstate(&s->rs, buf, size);
if (ret == -1) {
qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL,
NULL, NULL, NULL, true);
}
}
static void redirector_chr_event(void *opaque, QEMUChrEvent event)
{
NetFilterState *nf = opaque;
MirrorState *s = FILTER_REDIRECTOR(nf);
switch (event) {
case CHR_EVENT_CLOSED:
qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL,
NULL, NULL, NULL, true);
break;
default:
break;
}
}
static ssize_t filter_mirror_receive_iov(NetFilterState *nf,
NetClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
NetPacketSent *sent_cb)
{
MirrorState *s = FILTER_MIRROR(nf);
int ret;
ret = filter_send(s, iov, iovcnt);
if (ret < 0) {
error_report("filter mirror send failed(%s)", strerror(-ret));
}
/*
* we don't hope this error interrupt the normal
* path of net packet, so we always return zero.
*/
return 0;
}
static ssize_t filter_redirector_receive_iov(NetFilterState *nf,
NetClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
NetPacketSent *sent_cb)
{
MirrorState *s = FILTER_REDIRECTOR(nf);
int ret;
if (qemu_chr_fe_backend_connected(&s->chr_out)) {
ret = filter_send(s, iov, iovcnt);
if (ret < 0) {
error_report("filter redirector send failed(%s)", strerror(-ret));
}
return ret;
} else {
return 0;
}
}
static void filter_mirror_cleanup(NetFilterState *nf)
{
MirrorState *s = FILTER_MIRROR(nf);
qemu_chr_fe_deinit(&s->chr_out, false);
}
static void filter_redirector_cleanup(NetFilterState *nf)
{
MirrorState *s = FILTER_REDIRECTOR(nf);
qemu_chr_fe_deinit(&s->chr_in, false);
qemu_chr_fe_deinit(&s->chr_out, false);
}
static void filter_mirror_setup(NetFilterState *nf, Error **errp)
{
MirrorState *s = FILTER_MIRROR(nf);
Chardev *chr;
if (s->outdev == NULL) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, "filter-mirror parameter"\
" 'outdev' cannot be empty");
return;
}
chr = qemu_chr_find(s->outdev);
if (chr == NULL) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", s->outdev);
return;
}
qemu_chr_fe_init(&s->chr_out, chr, errp);
}
static void redirector_rs_finalize(SocketReadState *rs)
{
MirrorState *s = container_of(rs, MirrorState, rs);
NetFilterState *nf = NETFILTER(s);
redirector_to_filter(nf, rs->buf, rs->packet_len);
}
static void filter_redirector_setup(NetFilterState *nf, Error **errp)
{
MirrorState *s = FILTER_REDIRECTOR(nf);
Chardev *chr;
if (!s->indev && !s->outdev) {
error_setg(errp, "filter redirector needs 'indev' or "
"'outdev' at least one property set");
return;
} else if (s->indev && s->outdev) {
if (!strcmp(s->indev, s->outdev)) {
error_setg(errp, "'indev' and 'outdev' could not be same "
"for filter redirector");
return;
}
}
net_socket_rs_init(&s->rs, redirector_rs_finalize, s->vnet_hdr);
if (s->indev) {
chr = qemu_chr_find(s->indev);
if (chr == NULL) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"IN Device '%s' not found", s->indev);
return;
}
if (!qemu_chr_fe_init(&s->chr_in, chr, errp)) {
return;
}
qemu_chr_fe_set_handlers(&s->chr_in, redirector_chr_can_read,
redirector_chr_read, redirector_chr_event,
NULL, nf, NULL, true);
}
if (s->outdev) {
chr = qemu_chr_find(s->outdev);
if (chr == NULL) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"OUT Device '%s' not found", s->outdev);
return;
}
if (!qemu_chr_fe_init(&s->chr_out, chr, errp)) {
return;
}
}
}
static char *filter_redirector_get_indev(Object *obj, Error **errp)
{
MirrorState *s = FILTER_REDIRECTOR(obj);
return g_strdup(s->indev);
}
static void filter_redirector_set_indev(Object *obj,
const char *value,
Error **errp)
{
MirrorState *s = FILTER_REDIRECTOR(obj);
g_free(s->indev);
s->indev = g_strdup(value);
}
static char *filter_mirror_get_outdev(Object *obj, Error **errp)
{
MirrorState *s = FILTER_MIRROR(obj);
return g_strdup(s->outdev);
}
static void filter_mirror_set_outdev(Object *obj,
const char *value,
Error **errp)
{
MirrorState *s = FILTER_MIRROR(obj);
g_free(s->outdev);
s->outdev = g_strdup(value);
if (!s->outdev) {
error_setg(errp, "filter mirror needs 'outdev' "
"property set");
return;
}
}
static bool filter_mirror_get_vnet_hdr(Object *obj, Error **errp)
{
MirrorState *s = FILTER_MIRROR(obj);
return s->vnet_hdr;
}
static void filter_mirror_set_vnet_hdr(Object *obj, bool value, Error **errp)
{
MirrorState *s = FILTER_MIRROR(obj);
s->vnet_hdr = value;
}
static char *filter_redirector_get_outdev(Object *obj, Error **errp)
{
MirrorState *s = FILTER_REDIRECTOR(obj);
return g_strdup(s->outdev);
}
static void filter_redirector_set_outdev(Object *obj,
const char *value,
Error **errp)
{
MirrorState *s = FILTER_REDIRECTOR(obj);
g_free(s->outdev);
s->outdev = g_strdup(value);
}
static bool filter_redirector_get_vnet_hdr(Object *obj, Error **errp)
{
MirrorState *s = FILTER_REDIRECTOR(obj);
return s->vnet_hdr;
}
static void filter_redirector_set_vnet_hdr(Object *obj,
bool value,
Error **errp)
{
MirrorState *s = FILTER_REDIRECTOR(obj);
s->vnet_hdr = value;
}
static void filter_mirror_class_init(ObjectClass *oc, void *data)
{
NetFilterClass *nfc = NETFILTER_CLASS(oc);
object_class_property_add_str(oc, "outdev", filter_mirror_get_outdev,
filter_mirror_set_outdev);
object_class_property_add_bool(oc, "vnet_hdr_support",
filter_mirror_get_vnet_hdr,
filter_mirror_set_vnet_hdr);
nfc->setup = filter_mirror_setup;
nfc->cleanup = filter_mirror_cleanup;
nfc->receive_iov = filter_mirror_receive_iov;
}
static void filter_redirector_class_init(ObjectClass *oc, void *data)
{
NetFilterClass *nfc = NETFILTER_CLASS(oc);
object_class_property_add_str(oc, "indev", filter_redirector_get_indev,
filter_redirector_set_indev);
object_class_property_add_str(oc, "outdev", filter_redirector_get_outdev,
filter_redirector_set_outdev);
object_class_property_add_bool(oc, "vnet_hdr_support",
filter_redirector_get_vnet_hdr,
filter_redirector_set_vnet_hdr);
nfc->setup = filter_redirector_setup;
nfc->cleanup = filter_redirector_cleanup;
nfc->receive_iov = filter_redirector_receive_iov;
}
static void filter_mirror_init(Object *obj)
{
MirrorState *s = FILTER_MIRROR(obj);
s->vnet_hdr = false;
}
static void filter_redirector_init(Object *obj)
{
MirrorState *s = FILTER_REDIRECTOR(obj);
s->vnet_hdr = false;
}
static void filter_mirror_fini(Object *obj)
{
MirrorState *s = FILTER_MIRROR(obj);
g_free(s->outdev);
}
static void filter_redirector_fini(Object *obj)
{
MirrorState *s = FILTER_REDIRECTOR(obj);
g_free(s->indev);
g_free(s->outdev);
}
static const TypeInfo filter_redirector_info = {
.name = TYPE_FILTER_REDIRECTOR,
.parent = TYPE_NETFILTER,
.class_init = filter_redirector_class_init,
.instance_init = filter_redirector_init,
.instance_finalize = filter_redirector_fini,
.instance_size = sizeof(MirrorState),
};
static const TypeInfo filter_mirror_info = {
.name = TYPE_FILTER_MIRROR,
.parent = TYPE_NETFILTER,
.class_init = filter_mirror_class_init,
.instance_init = filter_mirror_init,
.instance_finalize = filter_mirror_fini,
.instance_size = sizeof(MirrorState),
};
static void register_types(void)
{
type_register_static(&filter_mirror_info);
type_register_static(&filter_redirector_info);
}
type_init(register_types);