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net/packet: fix packet drop as of virtio gso 

When we use raw socket as the vhost backend, a packet from virito with
gso offloading information, cannot be sent out in later validaton at
xmit path, as we did not set correct skb->protocol which is further used
for looking up the gso function.

To fix this, we set this field according to virito hdr information.

Fixes: e858fae2b0 ("virtio_net: use common code for virtio_net_hdr and skb GSO conversion")
Signed-off-by: Jianfeng Tan <jianfeng.tan@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jianfeng Tan 2018-09-29 15:41:27 +00:00 committed by David S. Miller
parent ca89319483
commit 9d2f67e43b
2 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
include/linux/virtio_net.h
View File

@ -5,6 +5,24 @@
#include <linux/if_vlan.h>
#include <uapi/linux/virtio_net.h>
static inline int virtio_net_hdr_set_proto(struct sk_buff *skb,
const struct virtio_net_hdr *hdr)
{
switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
case VIRTIO_NET_HDR_GSO_TCPV4:
case VIRTIO_NET_HDR_GSO_UDP:
skb->protocol = cpu_to_be16(ETH_P_IP);
break;
case VIRTIO_NET_HDR_GSO_TCPV6:
skb->protocol = cpu_to_be16(ETH_P_IPV6);
break;
default:
return -EINVAL;
}
return 0;
}
static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
const struct virtio_net_hdr *hdr,
bool little_endian)

11
net/packet/af_packet.c
View File

@ -2715,10 +2715,12 @@ tpacket_error:
}
}
if (po->has_vnet_hdr && virtio_net_hdr_to_skb(skb, vnet_hdr,
vio_le())) {
tp_len = -EINVAL;
goto tpacket_error;
if (po->has_vnet_hdr) {
if (virtio_net_hdr_to_skb(skb, vnet_hdr, vio_le())) {
tp_len = -EINVAL;
goto tpacket_error;
}
virtio_net_hdr_set_proto(skb, vnet_hdr);
}
skb->destructor = tpacket_destruct_skb;
@ -2915,6 +2917,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
if (err)
goto out_free;
len += sizeof(vnet_hdr);
virtio_net_hdr_set_proto(skb, &vnet_hdr);
}
skb_probe_transport_header(skb, reserve);