On Mon, Aug 22, 2022 at 4:29 PM Zhang Chen <chen.zh...@intel.com> wrote:
>
> When enabled the virtio-net-pci, guest network packet will
> load the vnet_hdr. In COLO status, the primary VM's network
> packet maybe redirect to another VM, it needs filter-redirect
> enable the vnet_hdr flag at the same time, COLO-proxy will
> correctly parse the original network packet. If have any
> misconfiguration here, the vnet_hdr_len is wrong for parse
> the packet, the data+offset will point to wrong place.
>
> Signed-off-by: Zhang Chen <chen.zh...@intel.com>
Not sure it's worth 7.1. So I queued this for 7.2.
Thanks
> ---
> net/colo.c | 25 ++++++++++++++++---------
> net/colo.h | 1 +
> net/trace-events | 2 +-
> 3 files changed, 18 insertions(+), 10 deletions(-)
>
> diff --git a/net/colo.c b/net/colo.c
> index 6b0ff562ad..fb2c36a026 100644
> --- a/net/colo.c
> +++ b/net/colo.c
> @@ -44,21 +44,28 @@ int parse_packet_early(Packet *pkt)
> {
> int network_length;
> static const uint8_t vlan[] = {0x81, 0x00};
> - uint8_t *data = pkt->data + pkt->vnet_hdr_len;
> + uint8_t *data = pkt->data;
> uint16_t l3_proto;
> ssize_t l2hdr_len;
>
> - if (data == NULL) {
> - trace_colo_proxy_main_vnet_info("This packet is not parsed
> correctly, "
> - "pkt->vnet_hdr_len",
> pkt->vnet_hdr_len);
> + assert(data);
> +
> + /* Check the received vnet_hdr_len then add the offset */
> + if ((pkt->vnet_hdr_len > sizeof(struct virtio_net_hdr_v1_hash)) ||
> + (pkt->size < sizeof(struct eth_header) + sizeof(struct vlan_header) +
> + pkt->vnet_hdr_len)) {
> + /*
> + * The received remote packet maybe misconfiguration here,
> + * Please enable/disable filter module's the vnet_hdr flag at
> + * the same time.
> + */
> + trace_colo_proxy_main_vnet_info("This received packet load wrong ",
> + pkt->vnet_hdr_len, pkt->size);
> return 1;
> }
> - l2hdr_len = eth_get_l2_hdr_length(data);
> + data += pkt->vnet_hdr_len;
>
> - if (pkt->size < ETH_HLEN + pkt->vnet_hdr_len) {
> - trace_colo_proxy_main("pkt->size < ETH_HLEN");
> - return 1;
> - }
> + l2hdr_len = eth_get_l2_hdr_length(data);
>
> /*
> * TODO: support vlan.
> diff --git a/net/colo.h b/net/colo.h
> index 8b3e8d5a83..22fc3031f7 100644
> --- a/net/colo.h
> +++ b/net/colo.h
> @@ -18,6 +18,7 @@
> #include "qemu/jhash.h"
> #include "qemu/timer.h"
> #include "net/eth.h"
> +#include "standard-headers/linux/virtio_net.h"
>
> #define HASHTABLE_MAX_SIZE 16384
>
> diff --git a/net/trace-events b/net/trace-events
> index 6af927b4b9..823a071bdc 100644
> --- a/net/trace-events
> +++ b/net/trace-events
> @@ -9,7 +9,7 @@ vhost_user_event(const char *chr, int event) "chr: %s got
> event: %d"
>
> # colo.c
> colo_proxy_main(const char *chr) ": %s"
> -colo_proxy_main_vnet_info(const char *sta, int size) ": %s = %d"
> +colo_proxy_main_vnet_info(const char *sta, uint32_t vnet_hdr, int size) ":
> %s pkt->vnet_hdr_len = %u, pkt->size = %d"
>
> # colo-compare.c
> colo_compare_main(const char *chr) ": %s"
> --
> 2.25.1
>
