ih->checksum = 0;
b->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4;
vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
ih->checksum = 0;
b->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4;
vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;