nat: Final NAT44 EI/ED split patch

[vpp.git] / src / plugins / nat / lib / lib.h

diff --git a/src/plugins/nat/lib/lib.h b/src/plugins/nat/lib/lib.h
index febe829..b0b5229 100644 (file)
--- a/src/plugins/nat/lib/lib.h
+++ b/src/plugins/nat/lib/lib.h
@@ -67,13 +67,80 @@ typedef enum
 #undef _
 } nat_protocol_t;
 
-/* default session timeouts */
+/* default protocol timeouts */
 #define NAT_UDP_TIMEOUT 300
 #define NAT_TCP_TRANSITORY_TIMEOUT 240
 #define NAT_TCP_ESTABLISHED_TIMEOUT 7440
 #define NAT_ICMP_TIMEOUT 60
 
-// TODO: move common formating definitions here
+typedef struct
+{
+  struct
+  {
+    u32 established;
+    u32 transitory;
+  } tcp;
+
+  u32 udp;
+  u32 icmp;
+
+} nat_timeouts_t;
+
+static_always_inline void
+nat_reset_timeouts (nat_timeouts_t * timeouts)
+{
+  timeouts->udp = NAT_UDP_TIMEOUT;
+  timeouts->tcp.established = NAT_TCP_ESTABLISHED_TIMEOUT;
+  timeouts->tcp.transitory = NAT_TCP_TRANSITORY_TIMEOUT;
+  timeouts->icmp = NAT_ICMP_TIMEOUT;
+}
+
+static_always_inline u32
+nat_session_get_timeout (nat_timeouts_t *timeouts, nat_protocol_t proto,
+                        u8 state)
+{
+  switch (proto)
+    {
+    case NAT_PROTOCOL_ICMP:
+      return timeouts->icmp;
+    case NAT_PROTOCOL_UDP:
+      return timeouts->udp;
+    case NAT_PROTOCOL_TCP:
+      {
+       if (state)
+         return timeouts->tcp.transitory;
+       else
+         return timeouts->tcp.established;
+      }
+    default:
+      return timeouts->udp;
+    }
+  return 0;
+}
+
+static_always_inline u32
+nat_calc_bihash_buckets (u32 n_elts)
+{
+  n_elts = n_elts / 2.5;
+  u64 lower_pow2 = 1;
+  while (lower_pow2 * 2 < n_elts)
+    {
+      lower_pow2 = 2 * lower_pow2;
+    }
+  u64 upper_pow2 = 2 * lower_pow2;
+  if ((upper_pow2 - n_elts) < (n_elts - lower_pow2))
+    {
+      if (upper_pow2 <= UINT32_MAX)
+       {
+         return upper_pow2;
+       }
+    }
+  return lower_pow2;
+}
+
+u8 *format_nat_protocol (u8 *s, va_list *args);
+
+uword unformat_nat_protocol (unformat_input_t *input, va_list *args);
 
 #endif /* included_nat_lib_h__ */
 /*