[Qemu-devel] [PULL 04/14] net/filter-mirror.c: Make filter mirror support vnet support.

[Jason Wang]

From: Zhang Chen <address@hidden>

We add the vnet_hdr_support option for filter-mirror, default is disabled.
If you use virtio-net-pci or other driver needs vnet_hdr, please enable it.
You can use it for example:
-object filter-mirror,id=m0,netdev=hn0,queue=tx,outdev=mirror0,vnet_hdr_support

If it has vnet_hdr_support flag, we will change the sending packet format from
struct {int size; const uint8_t buf[];} to {int size; int vnet_hdr_len; const 
uint8_t buf[];}.
make other module(like colo-compare) know how to parse net packet correctly.

Signed-off-by: Zhang Chen <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
---
 net/filter-mirror.c | 42 +++++++++++++++++++++++++++++++++++++++++-
 qemu-options.hx     |  5 ++---
 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/net/filter-mirror.c b/net/filter-mirror.c
index e8e5b60..32ecdb3 100644
--- a/net/filter-mirror.c
+++ b/net/filter-mirror.c
@@ -41,12 +41,14 @@ typedef struct MirrorState {
     CharBackend chr_in;
     CharBackend chr_out;
     SocketReadState rs;
+    bool vnet_hdr;
 } MirrorState;
 
 static int filter_send(MirrorState *s,
                        const struct iovec *iov,
                        int iovcnt)
 {
+    NetFilterState *nf = NETFILTER(s);
     int ret = 0;
     ssize_t size = 0;
     uint32_t len = 0;
@@ -63,6 +65,23 @@ static int filter_send(MirrorState *s,
         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;
+        }
+    }
+
     buf = g_malloc(size);
     iov_to_buf(iov, iovcnt, 0, buf, size);
     ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)buf, size);
@@ -229,7 +248,7 @@ static void filter_redirector_setup(NetFilterState *nf, 
Error **errp)
         }
     }
 
-    net_socket_rs_init(&s->rs, redirector_rs_finalize, false);
+    net_socket_rs_init(&s->rs, redirector_rs_finalize, s->vnet_hdr);
 
     if (s->indev) {
         chr = qemu_chr_find(s->indev);
@@ -318,6 +337,20 @@ static void filter_mirror_set_outdev(Object *obj,
     }
 }
 
+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);
@@ -337,8 +370,15 @@ static void filter_redirector_set_outdev(Object *obj,
 
 static void filter_mirror_init(Object *obj)
 {
+    MirrorState *s = FILTER_MIRROR(obj);
+
     object_property_add_str(obj, "outdev", filter_mirror_get_outdev,
                             filter_mirror_set_outdev, NULL);
+
+    s->vnet_hdr = false;
+    object_property_add_bool(obj, "vnet_hdr_support",
+                             filter_mirror_get_vnet_hdr,
+                             filter_mirror_set_vnet_hdr, NULL);
 }
 
 static void filter_redirector_init(Object *obj)
diff --git a/qemu-options.hx b/qemu-options.hx
index 2cc70b9..9eee712 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4249,10 +4249,9 @@ queue @var{all|rx|tx} is an option that can be applied 
to any netfilter.
 @option{tx}: the filter is attached to the transmit queue of the netdev,
              where it will receive packets sent by the netdev.
 
address@hidden -object 
filter-mirror,address@hidden,address@hidden,address@hidden,address@hidden|rx|tx}]
address@hidden -object 
filter-mirror,address@hidden,address@hidden,address@hidden,address@hidden|rx|tx}[,vnet_hdr_support]
 
-filter-mirror on netdev @var{netdevid},mirror net packet to chardev
address@hidden
+filter-mirror on netdev @var{netdevid},mirror net packet to address@hidden, if 
it has the vnet_hdr_support flag, filter-mirror will mirror packet with 
vnet_hdr_len.
 
 @item -object filter-redirector,address@hidden,address@hidden,address@hidden,
 address@hidden,address@hidden|rx|tx}]
-- 
2.7.4