urpf: Unicast reverse Path Forwarding (plugin)

Type: feature

 - move the IP4 code to plugin
 - add ip6 support
 - add suport for uRPF on TX
 - add tests

Change-Id: I074c2debc486d3e79c12fad4b8dbd72c41e841a0
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 171 insertions, 0 deletions

diff --git a/src/plugins/urpf/ip4_urpf.c b/src/plugins/urpf/ip4_urpf.c
new file mode 100644
index 00000000000..25b6c94bde3
--- /dev/null
+++ b/src/plugins/urpf/ip4_urpf.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 2015 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.
+ */
+/*
+ * ip/ip4_source_check.c: IP v4 check source address (unicast RPF check)
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <urpf/urpf.h>
+#include <urpf/urpf_dp.h>
+
+static char *ip4_urpf_error_strings[] = {
+#define _(a,b) "ip4-" # b,
+  foreach_urpf_error
+#undef _
+};
+
+VLIB_NODE_FN (ip4_rx_urpf_loose) (vlib_main_t * vm,
+				  vlib_node_runtime_t * node,
+				  vlib_frame_t * frame)
+{
+  return (urpf_inline (vm, node, frame, AF_IP4, VLIB_RX, URPF_MODE_LOOSE));
+}
+
+VLIB_NODE_FN (ip4_rx_urpf_strict) (vlib_main_t * vm,
+				   vlib_node_runtime_t * node,
+				   vlib_frame_t * frame)
+{
+  return (urpf_inline (vm, node, frame, AF_IP4, VLIB_RX, URPF_MODE_STRICT));
+}
+
+VLIB_NODE_FN (ip4_tx_urpf_loose) (vlib_main_t * vm,
+				  vlib_node_runtime_t * node,
+				  vlib_frame_t * frame)
+{
+  return (urpf_inline (vm, node, frame, AF_IP4, VLIB_TX, URPF_MODE_LOOSE));
+}
+
+VLIB_NODE_FN (ip4_tx_urpf_strict) (vlib_main_t * vm,
+				   vlib_node_runtime_t * node,
+				   vlib_frame_t * frame)
+{
+  return (urpf_inline (vm, node, frame, AF_IP4, VLIB_TX, URPF_MODE_STRICT));
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_rx_urpf_loose) = {
+  .name = "ip4-rx-urpf-loose",
+  .vector_size = sizeof (u32),
+
+  .n_next_nodes = URPF_N_NEXT,
+  .next_nodes = {
+    [URPF_NEXT_DROP] = "ip4-drop",
+  },
+  .n_errors = ARRAY_LEN (ip4_urpf_error_strings),
+  .error_strings = ip4_urpf_error_strings,
+
+  .format_buffer = format_ip4_header,
+  .format_trace = format_urpf_trace,
+};
+
+VLIB_REGISTER_NODE (ip4_rx_urpf_strict) = {
+  .name = "ip4-rx-urpf-strict",
+  .vector_size = sizeof (u32),
+
+  .n_next_nodes = URPF_N_NEXT,
+  .next_nodes = {
+    [URPF_NEXT_DROP] = "ip4-drop",
+  },
+  .n_errors = ARRAY_LEN (ip4_urpf_error_strings),
+  .error_strings = ip4_urpf_error_strings,
+
+  .format_buffer = format_ip4_header,
+  .format_trace = format_urpf_trace,
+};
+
+VLIB_REGISTER_NODE (ip4_tx_urpf_loose) = {
+  .name = "ip4-tx-urpf-loose",
+  .vector_size = sizeof (u32),
+
+  .n_next_nodes = URPF_N_NEXT,
+  .next_nodes = {
+    [URPF_NEXT_DROP] = "ip4-drop",
+  },
+  .n_errors = ARRAY_LEN (ip4_urpf_error_strings),
+  .error_strings = ip4_urpf_error_strings,
+
+  .format_buffer = format_ip4_header,
+  .format_trace = format_urpf_trace,
+};
+
+VLIB_REGISTER_NODE (ip4_tx_urpf_strict) = {
+  .name = "ip4-tx-urpf-strict",
+  .vector_size = sizeof (u32),
+
+  .n_next_nodes = URPF_N_NEXT,
+  .next_nodes = {
+    [URPF_NEXT_DROP] = "ip4-drop",
+  },
+  .n_errors = ARRAY_LEN (ip4_urpf_error_strings),
+  .error_strings = ip4_urpf_error_strings,
+
+  .format_buffer = format_ip4_header,
+  .format_trace = format_urpf_trace,
+};
+
+VNET_FEATURE_INIT (ip4_rx_urpf_loose_feat, static) =
+{
+  .arc_name = "ip4-unicast",
+  .node_name = "ip4-rx-urpf-loose",
+  .runs_before = VNET_FEATURES ("ip4-rx-urpf-strict"),
+};
+
+VNET_FEATURE_INIT (ip4_rx_urpf_strict_feat, static) =
+{
+  .arc_name = "ip4-unicast",
+  .node_name = "ip4-rx-urpf-strict",
+  .runs_before = VNET_FEATURES ("ip4-policer-classify"),
+};
+
+VNET_FEATURE_INIT (ip4_tx_urpf_loose_feat, static) =
+{
+  .arc_name = "ip4-output",
+  .node_name = "ip4-tx-urpf-loose",
+};
+
+VNET_FEATURE_INIT (ip4_tx_urpf_strict_feat, static) =
+{
+  .arc_name = "ip4-output",
+  .node_name = "ip4-tx-urpf-strict",
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */