Add initial code

The inital code is from this patch:
https://gerrit.fd.io/r/#/c/vpp/+/16580/
It is contributed by Intel and Travelping.
Jerome Tollet, Ed Warnicke, Dave Barach, Damjan Marion from Cisco
and other guys have gave lots of useful comments on it.

The initial code is used for identifying layer-7 applications for HTTPS/TLS traffic

- Below is the brief design info.

- Provides a default APPID database for scan.

- Dynamically create new SW mapping has been supported now.

- Support TCP connection state tracking.

- Support TCP segments reassembly on the fly, which handles out-of-order tcp segments and overlapping segments.
  It means that we do not need to reassembly segments first, then dedect applicaion,
  and then fragment segments again, which helps to improve performance.

- Support Hyperscan Stream mode, which can scan rules straddling into different tcp segments.
  It means that if there is a rule "abcde", then "abc" can be in packet 1,
  and "de" can be in packet 2.

- Configure static dpi flows with 5-tuple and VRF-aware, and supports both ipv4 and ipv6 flows.
  These flows will first try to HW offload to NIC based on DPDK rte_flow mechanism
  and vpp/vnet/flow infrastructure.
  If failed, then will create static SW flow mappings.
  Each flow configuration will create two HW or SW flow mappings, i.e. for forward and reverse traffic.
  And both flow mappings will be mapped to the same dpi flow.
  SW entry aging out mechanism will be added later.
        "dpi flow [add | del]  "
        "[src-ip <ip-addr>] [dst-ip <ip-addr>] "
        "[src-port <port>] [dst-port <port>] "
        "[protocol <protocol>] [vrf-id <nn>]",
        "dpi set flow-offload hw <interface-name> rx <flow-id> [del]",
        "dpi set ip4 flow-bypass <interface> [del]",

- When HW flow offload matched, packets will be redirected to DPI plugin with dpi flow_id in packet descriptor.
   If not, packets will be bypassed to DPI plugin from ip-input, and then lookup SW flow mapping table.

- Then will detect layer 7 applications.
   This first patch only detect sub protocls within SSL/TLS.
   1). Identify SSL/TLS certificate message and subsequent segments.
   2). Scan SSL/TLS certificate message through hyperscan, and get application id if matched.
   3). If maximum packets for this flow are checked and not found matched application, the detection will end up.

Ticket:
Type: feature

Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>
Signed-off-by: Andreas Schultz <andreas.schultz@travelping.com>
Signed-off-by: Mathias Gumz <mathias.gumz@travelping.com>
Change-Id: I839cc70ddc80ea594d22a04e2cabf92a7b9c74e7

1 files changed, 42 insertions, 0 deletions

diff --git a/src/dpi.api b/src/dpi.api
new file mode 100644
index 0000000..b9fa99e
--- /dev/null
+++ b/src/dpi.api
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018 Intel, Travelping 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.
+ */
+
+option version = "1.0.0";
+
+define dpi_flow_add_del {
+  u32 client_index;
+  u32 context;
+  u8 is_add;
+  u8 is_ipv6;
+  u8 src_ip[16];
+  u8 dst_ip[16];
+  u16 src_port;
+  u16 dst_port;
+  u32 vrf_id;
+  u8 protocol;
+};
+
+define dpi_flow_add_del_reply
+{
+  u32 context;
+  i32 retval;
+  u32 flow_id;
+};
+
+/*
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */