session: add support for application namespacing

Applications are now provided the option to select the namespace they
are to be attached to and the scope of their attachement. Application
namespaces are meant to:
1) constrain the scope of communication through the network by
association with source interfaces and/or fib tables that provide the
source ips to be used and limit the scope of routing
2) provide a namespace local scope to session layer communication, as
opposed to the global scope provided by 1). That is, sessions can be
established without assistance from transport and network layers.
Albeit, zero/local-host ip addresses must still be provided in session
establishment messages due to existing application idiosyncrasies. This
mode of communication uses shared-memory fifos (cut-through sessions)
exclusively.

If applications request no namespace, they are assigned to the default
one, which at its turn uses the default fib. Applications can request
access to both local and global scopes for a namespace. If no scope is
specified, session layer defaults to the global one.

When a sw_if_index is provided for a namespace, zero-ip (INADDR_ANY)
binds are converted to binds to the requested interface.

Change-Id: Ia0f660bbf7eec7f89673f75b4821fc7c3d58e3d1
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/src/vnet/session/session_table.h b/src/vnet/session/session_table.h
new file mode 100644
index 00000000000..ce0b4a2ff25
--- /dev/null
+++ b/src/vnet/session/session_table.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2017 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 SRC_VNET_SESSION_SESSION_TABLE_H_
+#define SRC_VNET_SESSION_SESSION_TABLE_H_
+
+#include <vppinfra/bihash_16_8.h>
+#include <vppinfra/bihash_48_8.h>
+
+typedef struct _session_lookup_table
+{
+  /**
+   * Lookup tables for established sessions and listeners
+   */
+  clib_bihash_16_8_t v4_session_hash;
+  clib_bihash_48_8_t v6_session_hash;
+
+  /**
+   * Lookup tables for half-open sessions
+   */
+  clib_bihash_16_8_t v4_half_open_hash;
+  clib_bihash_48_8_t v6_half_open_hash;
+} session_table_t;
+
+#define SESSION_TABLE_INVALID_INDEX ((u32)~0)
+#define SESSION_LOCAL_TABLE_PREFIX ((u32)~0)
+#define SESSION_INVALID_INDEX ((u32)~0)
+
+typedef int (*ip4_session_table_walk_fn_t) (clib_bihash_kv_16_8_t * kvp,
+					    void *ctx);
+
+void ip4_session_table_walk_cb (clib_bihash_kv_16_8_t * kvp, void *arg);
+void ip4_session_table_walk (clib_bihash_16_8_t * hash,
+			     ip4_session_table_walk_fn_t fn, void *arg);
+
+session_table_t *session_table_alloc (void);
+session_table_t *session_table_get (u32 table_index);
+u32 session_table_index (session_table_t * slt);
+void session_table_init (session_table_t * slt);
+
+#endif /* SRC_VNET_SESSION_SESSION_TABLE_H_ */
+/* *INDENT-ON* */
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */