cnat: Introduce parametric source policy

Type: feature

Change-Id: I60ae9dd1c100b587d1902a20596b99a5c8a95df7
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

1 files changed, 98 insertions, 0 deletions

diff --git a/src/plugins/cnat/cnat_inline.h b/src/plugins/cnat/cnat_inline.h
new file mode 100644
index 00000000000..5a55ecbf3c0
--- /dev/null
+++ b/src/plugins/cnat/cnat_inline.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#ifndef __CNAT_INLINE_H__
+#define __CNAT_INLINE_H__
+
+#include <cnat/cnat_types.h>
+
+always_inline u32
+cnat_timestamp_new (f64 t)
+{
+  u32 index;
+  cnat_timestamp_t *ts;
+  clib_rwlock_writer_lock (&cnat_main.ts_lock);
+  pool_get (cnat_timestamps, ts);
+  ts->last_seen = t;
+  ts->lifetime = cnat_main.session_max_age;
+  ts->refcnt = CNAT_TIMESTAMP_INIT_REFCNT;
+  index = ts - cnat_timestamps;
+  clib_rwlock_writer_unlock (&cnat_main.ts_lock);
+  return index;
+}
+
+always_inline void
+cnat_timestamp_inc_refcnt (u32 index)
+{
+  clib_rwlock_reader_lock (&cnat_main.ts_lock);
+  cnat_timestamp_t *ts = pool_elt_at_index (cnat_timestamps, index);
+  ts->refcnt++;
+  clib_rwlock_reader_unlock (&cnat_main.ts_lock);
+}
+
+always_inline void
+cnat_timestamp_update (u32 index, f64 t)
+{
+  clib_rwlock_reader_lock (&cnat_main.ts_lock);
+  cnat_timestamp_t *ts = pool_elt_at_index (cnat_timestamps, index);
+  ts->last_seen = t;
+  clib_rwlock_reader_unlock (&cnat_main.ts_lock);
+}
+
+always_inline void
+cnat_timestamp_set_lifetime (u32 index, u16 lifetime)
+{
+  clib_rwlock_reader_lock (&cnat_main.ts_lock);
+  cnat_timestamp_t *ts = pool_elt_at_index (cnat_timestamps, index);
+  ts->lifetime = lifetime;
+  clib_rwlock_reader_unlock (&cnat_main.ts_lock);
+}
+
+always_inline f64
+cnat_timestamp_exp (u32 index)
+{
+  f64 t;
+  if (INDEX_INVALID == index)
+    return -1;
+  clib_rwlock_reader_lock (&cnat_main.ts_lock);
+  cnat_timestamp_t *ts = pool_elt_at_index (cnat_timestamps, index);
+  t = ts->last_seen + (f64) ts->lifetime;
+  clib_rwlock_reader_unlock (&cnat_main.ts_lock);
+  return t;
+}
+
+always_inline void
+cnat_timestamp_free (u32 index)
+{
+  if (INDEX_INVALID == index)
+    return;
+  clib_rwlock_writer_lock (&cnat_main.ts_lock);
+  cnat_timestamp_t *ts = pool_elt_at_index (cnat_timestamps, index);
+  ts->refcnt--;
+  if (0 == ts->refcnt)
+    pool_put (cnat_timestamps, ts);
+  clib_rwlock_writer_unlock (&cnat_main.ts_lock);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
+
+#endif