geneve gtpu vxlan vxlan-gpe: VRF-aware bypass node

Bypass node MUST NOT intercept a packet if destination IP doesn’t match
a local address.  However IP address interpretation depends on the VRF,
hence bypass node must take that into account.

This patch also factors-out common VTEP management and checking code.

Type: improvement
Signed-off-by: Nick Zavaritsky <nick.zavaritsky@emnify.com>
Change-Id: I5665d94882bbf45d15f8da140c7ada528ec7fa94

1 files changed, 55 insertions, 0 deletions

diff --git a/src/vnet/ip/vtep.c b/src/vnet/ip/vtep.c
new file mode 100644
index 00000000000..d0493f8cd2f
--- /dev/null
+++ b/src/vnet/ip/vtep.c
@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+
+#include <vnet/ip/vtep.h>
+
+uword
+vtep_addr_ref (vtep_table_t * t, u32 fib_index, ip46_address_t * ip)
+{
+  vtep4_key_t key4 = {.addr = ip->ip4,.fib_index = fib_index };
+  vtep6_key_t key6 = {.addr = ip->ip6,.fib_index = fib_index };
+  uword *vtep = ip46_address_is_ip4 (ip) ?
+    hash_get (t->vtep4, key4.as_u64) : hash_get_mem (t->vtep6, &key6);
+  if (vtep)
+    return ++(*vtep);
+  ip46_address_is_ip4 (ip) ?
+    hash_set (t->vtep4, key4.as_u64, 1) :
+    hash_set_mem_alloc (&t->vtep6, &key6, 1);
+  return 1;
+}
+
+uword
+vtep_addr_unref (vtep_table_t * t, u32 fib_index, ip46_address_t * ip)
+{
+  vtep4_key_t key4 = {.addr = ip->ip4,.fib_index = fib_index };
+  vtep6_key_t key6 = {.addr = ip->ip6,.fib_index = fib_index };
+  uword *vtep = ip46_address_is_ip4 (ip) ?
+    hash_get (t->vtep4, key4.as_u64) : hash_get_mem (t->vtep6, &key6);
+  ALWAYS_ASSERT (vtep);
+  if (--(*vtep) != 0)
+    return *vtep;
+  ip46_address_is_ip4 (ip) ?
+    hash_unset (t->vtep4, key4.as_u64) :
+    hash_unset_mem_free (&t->vtep6, &key6);
+  return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */