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-rw-r--r--src/plugins/nat/nat_inlines.h73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/plugins/nat/nat_inlines.h b/src/plugins/nat/nat_inlines.h
index 4c79fd4124c..4bdb2cb66d9 100644
--- a/src/plugins/nat/nat_inlines.h
+++ b/src/plugins/nat/nat_inlines.h
@@ -19,6 +19,7 @@
#ifndef __included_nat_inlines_h__
#define __included_nat_inlines_h__
+#include <vnet/fib/ip4_fib.h>
#include <nat/nat.h>
always_inline u32
@@ -377,6 +378,78 @@ mss_clamping (snat_main_t * sm, tcp_header_t * tcp, ip_csum_t * sum)
}
}
+/**
+ * @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;
+ 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;}
+ ));
+ }
+
+ return 1;
+}
+
#endif /* __included_nat_inlines_h__ */
/*