+static_always_inline int
+get_icmp_o2i_ed_key (vlib_buffer_t * b, ip4_header_t * ip0, u32 rx_fib_index,
+ u32 thread_index, u32 session_index,
+ nat_protocol_t * nat_proto, u16 * l_port, u16 * r_port,
+ clib_bihash_kv_16_8_t * kv)
+{
+ icmp46_header_t *icmp0;
+ u8 proto;
+ ip4_address_t *l_addr, *r_addr;
+ u16 _l_port, _r_port;
+ icmp_echo_header_t *echo0, *inner_echo0 = 0;
+ ip4_header_t *inner_ip0;
+ void *l4_header = 0;
+ icmp46_header_t *inner_icmp0;
+
+ icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
+ echo0 = (icmp_echo_header_t *) (icmp0 + 1);
+
+ if (!icmp_type_is_error_message
+ (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
+ {
+ proto = IP_PROTOCOL_ICMP;
+ l_addr = &ip0->dst_address;
+ r_addr = &ip0->src_address;
+ _l_port = vnet_buffer (b)->ip.reass.l4_src_port;
+ _r_port = 0;
+ }
+ else
+ {
+ inner_ip0 = (ip4_header_t *) (echo0 + 1);
+ l4_header = ip4_next_header (inner_ip0);
+ proto = inner_ip0->protocol;
+ l_addr = &inner_ip0->src_address;
+ r_addr = &inner_ip0->dst_address;
+ switch (ip_proto_to_nat_proto (inner_ip0->protocol))