net/filter-mirror: implement filter-redirector
Filter-redirector is a netfilter plugin. It gives qemu the ability to redirect net packet. redirector can redirect filter's net packet to outdev. and redirect indev's packet to filter. filter + redirector | +--------------+ | | | indev +-----------+ +----------> outdev | | | +--------------+ | v filter usage: -netdev user,id=hn0 -chardev socket,id=s0,host=ip_primary,port=X,server,nowait -chardev socket,id=s1,host=ip_primary,port=Y,server,nowait -filter-redirector,id=r0,netdev=hn0,queue=tx/rx/all,indev=s0,outdev=s1 Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
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@ -27,12 +27,23 @@
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#define FILTER_MIRROR(obj) \
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OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_MIRROR)
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#define FILTER_REDIRECTOR(obj) \
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OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_REDIRECTOR)
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#define TYPE_FILTER_MIRROR "filter-mirror"
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#define TYPE_FILTER_REDIRECTOR "filter-redirector"
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#define REDIRECTOR_MAX_LEN NET_BUFSIZE
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typedef struct MirrorState {
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NetFilterState parent_obj;
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char *indev;
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char *outdev;
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CharDriverState *chr_in;
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CharDriverState *chr_out;
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int state; /* 0 = getting length, 1 = getting data */
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unsigned int index;
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unsigned int packet_len;
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uint8_t buf[REDIRECTOR_MAX_LEN];
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} MirrorState;
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static int filter_mirror_send(CharDriverState *chr_out,
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@ -69,6 +80,96 @@ err:
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return ret < 0 ? ret : -EIO;
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}
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static void
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redirector_to_filter(NetFilterState *nf, const uint8_t *buf, int len)
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{
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struct iovec iov = {
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.iov_base = (void *)buf,
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.iov_len = len,
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};
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if (nf->direction == NET_FILTER_DIRECTION_ALL ||
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nf->direction == NET_FILTER_DIRECTION_TX) {
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qemu_netfilter_pass_to_next(nf->netdev, 0, &iov, 1, nf);
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}
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if (nf->direction == NET_FILTER_DIRECTION_ALL ||
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nf->direction == NET_FILTER_DIRECTION_RX) {
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qemu_netfilter_pass_to_next(nf->netdev->peer, 0, &iov, 1, nf);
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}
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}
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static int redirector_chr_can_read(void *opaque)
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{
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return REDIRECTOR_MAX_LEN;
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}
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static void redirector_chr_read(void *opaque, const uint8_t *buf, int size)
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{
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NetFilterState *nf = opaque;
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MirrorState *s = FILTER_REDIRECTOR(nf);
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unsigned int l;
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while (size > 0) {
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/* reassemble a packet from the network */
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switch (s->state) { /* 0 = getting length, 1 = getting data */
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case 0:
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l = 4 - s->index;
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if (l > size) {
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l = size;
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}
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memcpy(s->buf + s->index, buf, l);
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buf += l;
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size -= l;
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s->index += l;
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if (s->index == 4) {
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/* got length */
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s->packet_len = ntohl(*(uint32_t *)s->buf);
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s->index = 0;
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s->state = 1;
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}
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break;
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case 1:
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l = s->packet_len - s->index;
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if (l > size) {
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l = size;
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}
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if (s->index + l <= sizeof(s->buf)) {
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memcpy(s->buf + s->index, buf, l);
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} else {
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error_report("serious error: oversized packet received.");
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s->index = s->state = 0;
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qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL);
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return;
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}
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s->index += l;
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buf += l;
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size -= l;
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if (s->index >= s->packet_len) {
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s->index = 0;
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s->state = 0;
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redirector_to_filter(nf, s->buf, s->packet_len);
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}
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break;
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}
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}
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}
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static void redirector_chr_event(void *opaque, int event)
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{
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NetFilterState *nf = opaque;
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MirrorState *s = FILTER_REDIRECTOR(nf);
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switch (event) {
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case CHR_EVENT_CLOSED:
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qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL);
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break;
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default:
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break;
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}
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}
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static ssize_t filter_mirror_receive_iov(NetFilterState *nf,
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NetClientState *sender,
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unsigned flags,
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@ -91,6 +192,27 @@ static ssize_t filter_mirror_receive_iov(NetFilterState *nf,
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return 0;
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}
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static ssize_t filter_redirector_receive_iov(NetFilterState *nf,
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NetClientState *sender,
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unsigned flags,
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const struct iovec *iov,
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int iovcnt,
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NetPacketSent *sent_cb)
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{
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MirrorState *s = FILTER_REDIRECTOR(nf);
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int ret;
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if (s->chr_out) {
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ret = filter_mirror_send(s->chr_out, iov, iovcnt);
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if (ret) {
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error_report("filter_mirror_send failed(%s)", strerror(-ret));
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}
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return iov_size(iov, iovcnt);
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} else {
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return 0;
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}
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}
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static void filter_mirror_cleanup(NetFilterState *nf)
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{
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MirrorState *s = FILTER_MIRROR(nf);
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@ -100,6 +222,19 @@ static void filter_mirror_cleanup(NetFilterState *nf)
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}
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}
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static void filter_redirector_cleanup(NetFilterState *nf)
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{
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MirrorState *s = FILTER_REDIRECTOR(nf);
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if (s->chr_in) {
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qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL);
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qemu_chr_fe_release(s->chr_in);
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}
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if (s->chr_out) {
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qemu_chr_fe_release(s->chr_out);
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}
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}
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static void filter_mirror_setup(NetFilterState *nf, Error **errp)
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{
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MirrorState *s = FILTER_MIRROR(nf);
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@ -123,6 +258,48 @@ static void filter_mirror_setup(NetFilterState *nf, Error **errp)
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}
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}
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static void filter_redirector_setup(NetFilterState *nf, Error **errp)
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{
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MirrorState *s = FILTER_REDIRECTOR(nf);
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if (!s->indev && !s->outdev) {
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error_setg(errp, "filter redirector needs 'indev' or "
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"'outdev' at least one property set");
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return;
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} else if (s->indev && s->outdev) {
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if (!strcmp(s->indev, s->outdev)) {
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error_setg(errp, "'indev' and 'outdev' could not be same "
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"for filter redirector");
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return;
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}
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}
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s->state = s->index = 0;
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if (s->indev) {
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s->chr_in = qemu_chr_find(s->indev);
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if (s->chr_in == NULL) {
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error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
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"IN Device '%s' not found", s->indev);
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return;
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}
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qemu_chr_fe_claim_no_fail(s->chr_in);
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qemu_chr_add_handlers(s->chr_in, redirector_chr_can_read,
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redirector_chr_read, redirector_chr_event, nf);
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}
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if (s->outdev) {
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s->chr_out = qemu_chr_find(s->outdev);
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if (s->chr_out == NULL) {
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error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
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"OUT Device '%s' not found", s->outdev);
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return;
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}
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qemu_chr_fe_claim_no_fail(s->chr_out);
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}
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}
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static void filter_mirror_class_init(ObjectClass *oc, void *data)
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{
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NetFilterClass *nfc = NETFILTER_CLASS(oc);
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@ -132,6 +309,31 @@ static void filter_mirror_class_init(ObjectClass *oc, void *data)
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nfc->receive_iov = filter_mirror_receive_iov;
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}
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static void filter_redirector_class_init(ObjectClass *oc, void *data)
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{
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NetFilterClass *nfc = NETFILTER_CLASS(oc);
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nfc->setup = filter_redirector_setup;
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nfc->cleanup = filter_redirector_cleanup;
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nfc->receive_iov = filter_redirector_receive_iov;
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}
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static char *filter_redirector_get_indev(Object *obj, Error **errp)
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{
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MirrorState *s = FILTER_REDIRECTOR(obj);
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return g_strdup(s->indev);
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}
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static void
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filter_redirector_set_indev(Object *obj, const char *value, Error **errp)
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{
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MirrorState *s = FILTER_REDIRECTOR(obj);
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g_free(s->indev);
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s->indev = g_strdup(value);
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}
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static char *filter_mirror_get_outdev(Object *obj, Error **errp)
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{
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MirrorState *s = FILTER_MIRROR(obj);
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@ -153,12 +355,36 @@ filter_mirror_set_outdev(Object *obj, const char *value, Error **errp)
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}
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}
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static char *filter_redirector_get_outdev(Object *obj, Error **errp)
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{
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MirrorState *s = FILTER_REDIRECTOR(obj);
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return g_strdup(s->outdev);
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}
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static void
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filter_redirector_set_outdev(Object *obj, const char *value, Error **errp)
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{
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MirrorState *s = FILTER_REDIRECTOR(obj);
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g_free(s->outdev);
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s->outdev = g_strdup(value);
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}
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static void filter_mirror_init(Object *obj)
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{
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object_property_add_str(obj, "outdev", filter_mirror_get_outdev,
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filter_mirror_set_outdev, NULL);
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}
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static void filter_redirector_init(Object *obj)
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{
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object_property_add_str(obj, "indev", filter_redirector_get_indev,
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filter_redirector_set_indev, NULL);
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object_property_add_str(obj, "outdev", filter_redirector_get_outdev,
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filter_redirector_set_outdev, NULL);
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}
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static void filter_mirror_fini(Object *obj)
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{
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MirrorState *s = FILTER_MIRROR(obj);
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@ -166,6 +392,23 @@ static void filter_mirror_fini(Object *obj)
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g_free(s->outdev);
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}
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static void filter_redirector_fini(Object *obj)
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{
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MirrorState *s = FILTER_REDIRECTOR(obj);
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g_free(s->indev);
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g_free(s->outdev);
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}
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static const TypeInfo filter_redirector_info = {
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.name = TYPE_FILTER_REDIRECTOR,
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.parent = TYPE_NETFILTER,
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.class_init = filter_redirector_class_init,
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.instance_init = filter_redirector_init,
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.instance_finalize = filter_redirector_fini,
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.instance_size = sizeof(MirrorState),
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};
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static const TypeInfo filter_mirror_info = {
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.name = TYPE_FILTER_MIRROR,
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.parent = TYPE_NETFILTER,
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@ -178,6 +421,7 @@ static const TypeInfo filter_mirror_info = {
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static void register_types(void)
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{
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type_register_static(&filter_mirror_info);
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type_register_static(&filter_redirector_info);
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}
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type_init(register_types);
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@ -3846,6 +3846,15 @@ queue @var{all|rx|tx} is an option that can be applied to any netfilter.
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filter-mirror on netdev @var{netdevid},mirror net packet to chardev
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@var{chardevid}
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@item -object filter-redirector,id=@var{id},netdev=@var{netdevid},indev=@var{chardevid},
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outdev=@var{chardevid}[,queue=@var{all|rx|tx}]
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filter-redirector on netdev @var{netdevid},redirect filter's net packet to chardev
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@var{chardevid},and redirect indev's packet to filter.
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Create a filter-redirector we need to differ outdev id from indev id, id can not
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be the same. we can just use indev or outdev, but at least one of indev or outdev
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need to be specified.
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@item -object filter-dump,id=@var{id},netdev=@var{dev},file=@var{filename}][,maxlen=@var{len}]
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Dump the network traffic on netdev @var{dev} to the file specified by
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3
vl.c
3
vl.c
@ -2842,7 +2842,8 @@ static bool object_create_initial(const char *type)
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*/
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if (g_str_equal(type, "filter-buffer") ||
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g_str_equal(type, "filter-dump") ||
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g_str_equal(type, "filter-mirror")) {
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g_str_equal(type, "filter-mirror") ||
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g_str_equal(type, "filter-redirector")) {
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return false;
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}
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