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authorMohsin Kazmi <sykazmi@cisco.com>2020-03-25 20:37:16 +0000
committerAndrew Yourtchenko <ayourtch@gmail.com>2020-03-30 11:39:22 +0000
commit0937fdfa86ce61c54f37d142aabae45463a959e5 (patch)
tree2aacbc36145319c9fac0ffe7dafd8d74b7e43b2b /src/vnet/devices/virtio/device.c
parent7654a718669f0dc950344c049186b9452bf48ca9 (diff)
gso: fix the header parser to read only
Previously, header parser sets the tcp/udp checksum to 0. It should be read only function for vlib_buffer_t. Type: fix Change-Id: I9c3398372f22998da3df188f0b7db13748303068 Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Diffstat (limited to 'src/vnet/devices/virtio/device.c')
-rw-r--r--src/vnet/devices/virtio/device.c42
1 files changed, 38 insertions, 4 deletions
diff --git a/src/vnet/devices/virtio/device.c b/src/vnet/devices/virtio/device.c
index 856e5f275e3..76f85588ec8 100644
--- a/src/vnet/devices/virtio/device.c
+++ b/src/vnet/devices/virtio/device.c
@@ -158,9 +158,21 @@ set_checksum_offsets (vlib_main_t * vm, virtio_if_t * vif, vlib_buffer_t * b,
hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
hdr->csum_start = gho.l4_hdr_offset; // 0x22;
if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
- hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ {
+ tcp_header_t *tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b) +
+ gho.l4_hdr_offset);
+ tcp->checksum = 0;
+ hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ }
else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
- hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
+ {
+ udp_header_t *udp =
+ (udp_header_t *) (vlib_buffer_get_current (b) +
+ gho.l4_hdr_offset);
+ udp->checksum = 0;
+ hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
+ }
/*
* virtio devices do not support IP4 checksum offload. So driver takes care
@@ -177,9 +189,21 @@ set_checksum_offsets (vlib_main_t * vm, virtio_if_t * vif, vlib_buffer_t * b,
hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
hdr->csum_start = gho.l4_hdr_offset; // 0x36;
if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
- hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ {
+ tcp_header_t *tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b) +
+ gho.l4_hdr_offset);
+ tcp->checksum = 0;
+ hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ }
else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
- hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
+ {
+ udp_header_t *udp =
+ (udp_header_t *) (vlib_buffer_get_current (b) +
+ gho.l4_hdr_offset);
+ udp->checksum = 0;
+ hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
+ }
}
}
@@ -202,10 +226,15 @@ add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif,
if (b->flags & VNET_BUFFER_F_IS_IP4)
{
ip4_header_t *ip4;
+ tcp_header_t *tcp;
gso_header_offset_t gho = vnet_gso_header_offset_parser (b, 0);
hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
hdr->gso_size = vnet_buffer2 (b)->gso_size;
hdr->hdr_len = gho.l4_hdr_offset + gho.l4_hdr_sz;
+ tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b) +
+ gho.l4_hdr_offset);
+ tcp->checksum = 0;
hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
hdr->csum_start = gho.l4_hdr_offset; // 0x22;
hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
@@ -221,11 +250,16 @@ add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif,
}
else if (b->flags & VNET_BUFFER_F_IS_IP6)
{
+ tcp_header_t *tcp;
gso_header_offset_t gho = vnet_gso_header_offset_parser (b, 1);
hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
hdr->gso_size = vnet_buffer2 (b)->gso_size;
hdr->hdr_len = gho.l4_hdr_offset + gho.l4_hdr_sz;
hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b) +
+ gho.l4_hdr_offset);
+ tcp->checksum = 0;
hdr->csum_start = gho.l4_hdr_offset; // 0x36;
hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
}