+static_always_inline void
+mark_tcp_udp_cksum_calc (vlib_buffer_t * b)
+{
+ ethernet_header_t *eth = vlib_buffer_get_current (b);
+ if (clib_net_to_host_u16 (eth->type) == ETHERNET_TYPE_IP4)
+ {
+ ip4_header_t *ip4 =
+ (vlib_buffer_get_current (b) + sizeof (ethernet_header_t));
+ b->flags |= VNET_BUFFER_F_IS_IP4;
+ if (ip4->protocol == IP_PROTOCOL_TCP)
+ {
+ b->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ ((tcp_header_t
+ *) (vlib_buffer_get_current (b) +
+ sizeof (ethernet_header_t) +
+ ip4_header_bytes (ip4)))->checksum = 0;
+ }
+ else if (ip4->protocol == IP_PROTOCOL_UDP)
+ {
+ b->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+ ((udp_header_t
+ *) (vlib_buffer_get_current (b) +
+ sizeof (ethernet_header_t) +
+ ip4_header_bytes (ip4)))->checksum = 0;
+ }
+ vnet_buffer (b)->l3_hdr_offset = sizeof (ethernet_header_t);
+ vnet_buffer (b)->l4_hdr_offset =
+ sizeof (ethernet_header_t) + ip4_header_bytes (ip4);
+ }
+ else if (clib_net_to_host_u16 (eth->type) == ETHERNET_TYPE_IP6)
+ {
+ ip6_header_t *ip6 =
+ (vlib_buffer_get_current (b) + sizeof (ethernet_header_t));
+ b->flags |= VNET_BUFFER_F_IS_IP6;
+ u16 ip6_hdr_len = sizeof (ip6_header_t);
+ if (ip6_ext_hdr (ip6->protocol))
+ {
+ ip6_ext_header_t *p = (void *) (ip6 + 1);
+ ip6_hdr_len += ip6_ext_header_len (p);
+ while (ip6_ext_hdr (p->next_hdr))
+ {
+ ip6_hdr_len += ip6_ext_header_len (p);
+ p = ip6_ext_next_header (p);
+ }
+ }
+ if (ip6->protocol == IP_PROTOCOL_TCP)
+ {
+ b->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ ((tcp_header_t
+ *) (vlib_buffer_get_current (b) +
+ sizeof (ethernet_header_t) + ip6_hdr_len))->checksum = 0;
+ }
+ else if (ip6->protocol == IP_PROTOCOL_UDP)
+ {
+ b->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+ ((udp_header_t
+ *) (vlib_buffer_get_current (b) +
+ sizeof (ethernet_header_t) + ip6_hdr_len))->checksum = 0;
+ }
+ vnet_buffer (b)->l3_hdr_offset = sizeof (ethernet_header_t);
+ vnet_buffer (b)->l4_hdr_offset =
+ sizeof (ethernet_header_t) + ip6_hdr_len;
+ }
+}
+