The commit be50da3e9d4a ("net: virtio_net: implement exact header length
guest feature") introduces support for the VIRTIO_NET_F_GUEST_HDRLEN
feature in virtio-net.
This feature requires virtio-net to set hdr_len to the actual header
length of the packet when transmitting, the number of
bytes from the start of the packet to the beginning of the
transport-layer payload.
However, in practice, hdr_len was being set using skb_headlen(skb),
which is clearly incorrect. This commit fixes that issue.
Fixes: be50da3e9d4a ("net: virtio_net: implement exact header length guest
feature")
Signed-off-by: Xuan Zhuo <[email protected]>
---
drivers/net/tun_vnet.h | 2 +-
drivers/net/virtio_net.c | 6 +++-
include/linux/virtio_net.h | 58 ++++++++++++++++++++++++++++++--------
3 files changed, 53 insertions(+), 13 deletions(-)
diff --git a/drivers/net/tun_vnet.h b/drivers/net/tun_vnet.h
index a5f93b6c4482..fa5cab9d3e55 100644
--- a/drivers/net/tun_vnet.h
+++ b/drivers/net/tun_vnet.h
@@ -244,7 +244,7 @@ tun_vnet_hdr_tnl_from_skb(unsigned int flags,
if (virtio_net_hdr_tnl_from_skb(skb, tnl_hdr, has_tnl_offload,
tun_vnet_is_little_endian(flags),
- vlan_hlen, true)) {
+ vlan_hlen, true, false)) {
struct virtio_net_hdr_v1 *hdr = &tnl_hdr->hash_hdr.hdr;
struct skb_shared_info *sinfo = skb_shinfo(skb);
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 72d6a9c6a5a2..7106333ef904 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3267,8 +3267,12 @@ static int xmit_skb(struct send_queue *sq, struct
sk_buff *skb, bool orphan)
struct virtio_net_hdr_v1_hash_tunnel *hdr;
int num_sg;
unsigned hdr_len = vi->hdr_len;
+ bool feature_hdrlen;
bool can_push;
+ feature_hdrlen = virtio_has_feature(vi->vdev,
+ VIRTIO_NET_F_GUEST_HDRLEN);
+
pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
/* Make sure it's safe to cast between formats */
@@ -3288,7 +3292,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff
*skb, bool orphan)
if (virtio_net_hdr_tnl_from_skb(skb, hdr, vi->tx_tnl,
virtio_is_little_endian(vi->vdev), 0,
- false))
+ false, feature_hdrlen))
return -EPROTO;
if (vi->mergeable_rx_bufs)
diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
index 75dabb763c65..23f42bb8ece0 100644
--- a/include/linux/virtio_net.h
+++ b/include/linux/virtio_net.h
@@ -207,20 +207,40 @@ static inline int virtio_net_hdr_to_skb(struct sk_buff
*skb,
return __virtio_net_hdr_to_skb(skb, hdr, little_endian, hdr->gso_type);
}
-static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
- struct virtio_net_hdr *hdr,
- bool little_endian,
- bool has_data_valid,
- int vlan_hlen)
+static inline void virtio_net_set_hdrlen(const struct sk_buff *skb,
+ struct virtio_net_hdr *hdr,
+ bool little_endian,
+ bool feature_hdrlen)
+{
+ u16 hdr_len;
+
+ if (feature_hdrlen) {
+ hdr_len = skb_transport_offset(skb);
+
+ if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP_L4)
+ hdr_len += sizeof(struct udphdr);
+ else
+ hdr_len += tcp_hdrlen(skb);
+ } else {
+ /* This is a hint as to how much should be linear. */
+ hdr_len = skb_headlen(skb);
+ }
+
+ hdr->hdr_len = __cpu_to_virtio16(little_endian, hdr_len);
+}
+
+static inline int __virtio_net_hdr_from_skb(const struct sk_buff *skb,
+ struct virtio_net_hdr *hdr,
+ bool little_endian,
+ bool has_data_valid,
+ bool feature_hdrlen,
+ int vlan_hlen)
{
memset(hdr, 0, sizeof(*hdr)); /* no info leak */
if (skb_is_gso(skb)) {
struct skb_shared_info *sinfo = skb_shinfo(skb);
- /* This is a hint as to how much should be linear. */
- hdr->hdr_len = __cpu_to_virtio16(little_endian,
- skb_headlen(skb));
hdr->gso_size = __cpu_to_virtio16(little_endian,
sinfo->gso_size);
if (sinfo->gso_type & SKB_GSO_TCPV4)
@@ -231,6 +251,10 @@ static inline int virtio_net_hdr_from_skb(const struct
sk_buff *skb,
hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP_L4;
else
return -EINVAL;
+
+ virtio_net_set_hdrlen(skb, hdr, little_endian,
+ feature_hdrlen);
+
if (sinfo->gso_type & SKB_GSO_TCP_ECN)
hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
} else
@@ -250,6 +274,16 @@ static inline int virtio_net_hdr_from_skb(const struct
sk_buff *skb,
return 0;
}
+static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
+ struct virtio_net_hdr *hdr,
+ bool little_endian,
+ bool has_data_valid,
+ int vlan_hlen)
+{
+ return __virtio_net_hdr_from_skb(skb, hdr, little_endian,
+ has_data_valid, false, vlan_hlen);
+}
+
static inline unsigned int virtio_l3min(bool is_ipv6)
{
return is_ipv6 ? sizeof(struct ipv6hdr) : sizeof(struct iphdr);
@@ -385,7 +419,8 @@ virtio_net_hdr_tnl_from_skb(const struct sk_buff *skb,
bool tnl_hdr_negotiated,
bool little_endian,
int vlan_hlen,
- bool has_data_valid)
+ bool has_data_valid,
+ bool feature_hdrlen)
{
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)vhdr;
unsigned int inner_nh, outer_th;
@@ -395,8 +430,9 @@ virtio_net_hdr_tnl_from_skb(const struct sk_buff *skb,
tnl_gso_type = skb_shinfo(skb)->gso_type & (SKB_GSO_UDP_TUNNEL |
SKB_GSO_UDP_TUNNEL_CSUM);
if (!tnl_gso_type)
- return virtio_net_hdr_from_skb(skb, hdr, little_endian,
- has_data_valid, vlan_hlen);
+ return __virtio_net_hdr_from_skb(skb, hdr, little_endian,
+ has_data_valid,
+ feature_hdrlen, vlan_hlen);
/* Tunnel support not negotiated but skb ask for it. */
if (!tnl_hdr_negotiated)
--
2.32.0.3.g01195cf9f
