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VSOCK: Add virtio vsock vsockmon hooks

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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>
This commit is contained in:
Gerard Garcia 2017-04-21 10:10:46 +01:00 committed by David S. Miller
parent 0b2e66448b
commit 82dfb540ae
4 changed files with 76 additions and 0 deletions
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8
drivers/vhost/vsock.c
View File

@ -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);

1
include/linux/virtio_vsock.h
View File

@ -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 */

3
net/vmw_vsock/virtio_transport.c
View File

@ -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));

64
net/vmw_vsock/virtio_transport_common.c
View File

@ -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)
{