+ 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->src_address;
+ r_addr = &ip0->dst_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;
+ r_addr = &inner_ip0->src_address;
+ l_addr = &inner_ip0->dst_address;
+ switch (ip_proto_to_nat_proto (inner_ip0->protocol))
+ {
+ case NAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t *) l4_header;
+ inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
+ _r_port = 0;
+ _l_port = inner_echo0->identifier;
+ break;
+ case NAT_PROTOCOL_UDP:
+ case NAT_PROTOCOL_TCP:
+ _l_port = ((tcp_udp_header_t *) l4_header)->dst_port;
+ _r_port = ((tcp_udp_header_t *) l4_header)->src_port;
+ break;
+ default:
+ return NAT_IN2OUT_ED_ERROR_UNSUPPORTED_PROTOCOL;
+ }
+ }
+ init_ed_kv (kv, *l_addr, _l_port, *r_addr, _r_port, rx_fib_index, proto,
+ thread_index, session_index);
+ if (nat_proto)
+ {
+ *nat_proto = ip_proto_to_nat_proto (proto);
+ }
+ if (l_port)
+ {
+ *l_port = _l_port;
+ }
+ if (r_port)
+ {
+ *r_port = _r_port;
+ }
+ return 0;
+}
+
+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))
+ {
+ case NAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t *) l4_header;
+ inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
+ _l_port = inner_echo0->identifier;
+ _r_port = 0;
+ break;
+ case NAT_PROTOCOL_UDP:
+ case NAT_PROTOCOL_TCP:
+ _l_port = ((tcp_udp_header_t *) l4_header)->src_port;
+ _r_port = ((tcp_udp_header_t *) l4_header)->dst_port;
+ break;
+ default:
+ return -1;
+ }
+ }
+ init_ed_kv (kv, *l_addr, _l_port, *r_addr, _r_port, rx_fib_index, proto,
+ thread_index, session_index);
+ if (nat_proto)
+ {
+ *nat_proto = ip_proto_to_nat_proto (proto);
+ }
+ if (l_port)
+ {
+ *l_port = _l_port;
+ }
+ if (r_port)
+ {
+ *r_port = _r_port;
+ }
+ return 0;
+}
+
+/**
+ * @brief Check if packet should be translated
+ *
+ * Packets aimed at outside interface and external address with active session
+ * should be translated.
+ *
+ * @param sm NAT main
+ * @param rt NAT runtime data
+ * @param sw_if_index0 index of the inside interface
+ * @param ip0 IPv4 header
+ * @param proto0 NAT protocol
+ * @param rx_fib_index0 RX FIB index
+ *
+ * @returns 0 if packet should be translated otherwise 1
+ */
+static inline int
+snat_not_translate_fast (snat_main_t * sm, vlib_node_runtime_t * node,
+ u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
+ u32 rx_fib_index0)
+{
+ if (sm->out2in_dpo)
+ return 0;
+
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ nat_outside_fib_t *outside_fib;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {
+ .ip4.as_u32 = ip0->dst_address.as_u32,
+ }
+ ,
+ };
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
+ ip0->dst_address.as_u32)))
+ return 1;
+
+ fei = fib_table_lookup (rx_fib_index0, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ {
+ u32 sw_if_index = fib_entry_get_resolving_interface (fei);
+ if (sw_if_index == ~0)
+ {
+ vec_foreach (outside_fib, sm->outside_fibs)
+ {
+ fei = fib_table_lookup (outside_fib->fib_index, &pfx);
+ if (FIB_NODE_INDEX_INVALID != fei)
+ {
+ sw_if_index = fib_entry_get_resolving_interface (fei);
+ if (sw_if_index != ~0)
+ break;
+ }
+ }
+ }
+ if (sw_if_index == ~0)
+ return 1;
+
+ snat_interface_t *i;
+ /* *INDENT-OFF* */
+ pool_foreach (i, sm->interfaces, ({
+ /* NAT packet aimed at outside interface */
+ if ((nat_interface_is_outside (i)) && (sw_if_index == i->sw_if_index))
+ return 0;
+ }));
+ /* *INDENT-ON* */
+ }
+
+ return 1;
+}
+
+static inline void
+increment_v4_address (ip4_address_t * a)
+{
+ u32 v;
+
+ v = clib_net_to_host_u32 (a->as_u32) + 1;
+ a->as_u32 = clib_host_to_net_u32 (v);
+}
+
+static_always_inline u16
+snat_random_port (u16 min, u16 max)
+{
+ snat_main_t *sm = &snat_main;
+ u32 rwide;
+ u16 r;
+
+ rwide = random_u32 (&sm->random_seed);
+ r = rwide & 0xFFFF;
+ if (r >= min && r <= max)
+ return r;
+
+ return min + (rwide % (max - min + 1));