VSOCK: Add virtio vsock vsockmon hooks

The virtio drivers deal with struct virtio_vsock_pkt.  Add
virtio_transport_deliver_tap_pkt(pkt) for handing packets to the
vsockmon device.

We call virtio_transport_deliver_tap_pkt(pkt) from
net/vmw_vsock/virtio_transport.c and drivers/vhost/vsock.c instead of
common code.  This is because the drivers may drop packets before
handing them to common code - we still want to capture them.

Signed-off-by: Gerard Garcia <ggarcia@deic.uab.cat>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Jorgen Hansen <jhansen@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 44eed8e..d939ac1 100644 (file)
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -176,6 +176,11 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
                                restart_tx = true;
                }
 
+               /* Deliver to monitoring devices all correctly transmitted
+                * packets.
+                */
+               virtio_transport_deliver_tap_pkt(pkt);
+
                virtio_transport_free_pkt(pkt);
        }
        if (added)
@@ -383,6 +388,9 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
 
                len = pkt->len;
 
+               /* Deliver to monitoring devices all received packets */
+               virtio_transport_deliver_tap_pkt(pkt);
+
                /* Only accept correctly addressed packets */
                if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid)
                        virtio_transport_recv_pkt(pkt);

diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index 584f9a6..ab13f07 100644 (file)
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -153,5 +153,6 @@ void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt);
 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt);
 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted);
 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
+void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt);
 
 #endif /* _LINUX_VIRTIO_VSOCK_H */

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 68675a1..9dffe02 100644 (file)
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -144,6 +144,8 @@ virtio_transport_send_pkt_work(struct work_struct *work)
                list_del_init(&pkt->list);
                spin_unlock_bh(&vsock->send_pkt_list_lock);
 
+               virtio_transport_deliver_tap_pkt(pkt);
+
                reply = pkt->reply;
 
                sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
@@ -370,6 +372,7 @@ static void virtio_transport_rx_work(struct work_struct *work)
                        }
 
                        pkt->len = len - sizeof(pkt->hdr);
+                       virtio_transport_deliver_tap_pkt(pkt);
                        virtio_transport_recv_pkt(pkt);
                }
        } while (!virtqueue_enable_cb(vq));

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index af087b4..18e2479 100644 (file)
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -16,6 +16,7 @@
 #include <linux/virtio_ids.h>
 #include <linux/virtio_config.h>
 #include <linux/virtio_vsock.h>
+#include <uapi/linux/vsockmon.h>
 
 #include <net/sock.h>
 #include <net/af_vsock.h>
@@ -85,6 +86,69 @@ out_pkt:
        return NULL;
 }
 
+/* Packet capture */
+static struct sk_buff *virtio_transport_build_skb(void *opaque)
+{
+       struct virtio_vsock_pkt *pkt = opaque;
+       unsigned char *t_hdr, *payload;
+       struct af_vsockmon_hdr *hdr;
+       struct sk_buff *skb;
+
+       skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + pkt->len,
+                       GFP_ATOMIC);
+       if (!skb)
+               return NULL;
+
+       hdr = (struct af_vsockmon_hdr *)skb_put(skb, sizeof(*hdr));
+
+       /* pkt->hdr is little-endian so no need to byteswap here */
+       hdr->src_cid = pkt->hdr.src_cid;
+       hdr->src_port = pkt->hdr.src_port;
+       hdr->dst_cid = pkt->hdr.dst_cid;
+       hdr->dst_port = pkt->hdr.dst_port;
+
+       hdr->transport = cpu_to_le16(AF_VSOCK_TRANSPORT_VIRTIO);
+       hdr->len = cpu_to_le16(sizeof(pkt->hdr));
+       memset(hdr->reserved, 0, sizeof(hdr->reserved));
+
+       switch (le16_to_cpu(pkt->hdr.op)) {
+       case VIRTIO_VSOCK_OP_REQUEST:
+       case VIRTIO_VSOCK_OP_RESPONSE:
+               hdr->op = cpu_to_le16(AF_VSOCK_OP_CONNECT);
+               break;
+       case VIRTIO_VSOCK_OP_RST:
+       case VIRTIO_VSOCK_OP_SHUTDOWN:
+               hdr->op = cpu_to_le16(AF_VSOCK_OP_DISCONNECT);
+               break;
+       case VIRTIO_VSOCK_OP_RW:
+               hdr->op = cpu_to_le16(AF_VSOCK_OP_PAYLOAD);
+               break;
+       case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
+       case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
+               hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL);
+               break;
+       default:
+               hdr->op = cpu_to_le16(AF_VSOCK_OP_UNKNOWN);
+               break;
+       }
+
+       t_hdr = skb_put(skb, sizeof(pkt->hdr));
+       memcpy(t_hdr, &pkt->hdr, sizeof(pkt->hdr));
+
+       if (pkt->len) {
+               payload = skb_put(skb, pkt->len);
+               memcpy(payload, pkt->buf, pkt->len);
+       }
+
+       return skb;
+}
+
+void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt)
+{
+       vsock_deliver_tap(virtio_transport_build_skb, pkt);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
+
 static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
                                          struct virtio_vsock_pkt_info *info)
 {