Cisco Discovery Protocol, initial working attempt

There are multiple enhancement opportunities...

Change-Id: I976772dc3802f8284e8c6457c001d68184831e25
Signed-off-by: Dave Barach <dave@barachs.net>

1 files changed, 133 insertions, 0 deletions

diff --git a/vnet/vnet/cdp/cdp_node.h b/vnet/vnet/cdp/cdp_node.h
new file mode 100644
index 00000000000..712ff14222f
--- /dev/null
+++ b/vnet/vnet/cdp/cdp_node.h
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2011-2016 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 __included_cdp_node_h__
+#define __included_cdp_node_h__
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+
+#include <vnet/snap/snap.h>
+#include <vnet/hdlc/hdlc.h>
+#include <vnet/hdlc/packet.h>
+
+#include <vppinfra/format.h>
+#include <vppinfra/hash.h>
+
+#include <vnet/cdp/cdp_protocol.h>
+
+typedef enum {
+    CDP_PACKET_TEMPLATE_ETHERNET,
+    CDP_PACKET_TEMPLATE_HDLC,
+    CDP_PACKET_TEMPLATE_SRP,
+    CDP_N_PACKET_TEMPLATES,
+} cdp_packet_template_id_t;
+
+typedef struct {
+    /* neighbor's vlib software interface index */
+    u32 sw_if_index;
+
+    /* Timers */
+    f64 last_heard;
+    f64 last_sent;
+
+    /* Neighbor time-to-live (usually 180s) */
+    u8  ttl_in_seconds;
+
+    /* "no cdp run" or similar */
+    u8  disabled;
+
+    /* tx packet template id for this neighbor */
+    u8  packet_template_index;
+
+    /* Jenkins hash optimization: avoid tlv scan, send short keepalive msg */
+    u8  last_packet_signature_valid;
+    uword last_packet_signature;
+
+    /* Info we actually keep about each neighbor */
+    u8 *device_name;
+    u8 *version;
+    u8 *port_id;
+    u8 *platform;
+
+    /* last received packet, for the J-hash optimization */
+    u8 *last_rx_pkt;
+} cdp_neighbor_t;
+
+#define foreach_neighbor_string_field           \
+_(device_name)                                  \
+_(version)                                      \
+_(port_id)                                      \
+_(platform)
+
+typedef struct {
+    /* pool of cdp neighbors */
+    cdp_neighbor_t *neighbors;
+
+    /* tx pcap debug enable */
+    u8 tx_pcap_debug;
+
+    /* rapidly find a neighbor by vlib software interface index */
+    uword *neighbor_by_sw_if_index;
+
+    /* Background process node index */
+    u32 cdp_process_node_index;
+
+    /* Packet templates for different encap types */
+    vlib_packet_template_t packet_templates [CDP_N_PACKET_TEMPLATES];
+
+    /* convenience variables */
+    vlib_main_t *vlib_main;
+    vnet_main_t *vnet_main;
+} cdp_main_t;
+
+cdp_main_t cdp_main;
+
+/* Packet counters */
+#define foreach_cdp_error                                       \
+_ (NONE, "good cdp packets (processed)")	                \
+_ (CACHE_HIT, "good cdp packets (cache hit)")			\
+_ (BAD_TLV, "cdp packets with bad TLVs")                        \
+_ (PROTOCOL_VERSION, "cdp packets with bad protocol versions")  \
+_ (CHECKSUM, "cdp packets with bad checksums")                  \
+_ (DISABLED, "cdp packets received on disabled interfaces")
+
+typedef enum {
+#define _(sym,str) CDP_ERROR_##sym,
+  foreach_cdp_error
+#undef _
+  CDP_N_ERROR,
+} cdp_error_t;
+
+/* cdp packet trace capture */
+typedef struct {
+    u32 len;
+    u8  data[400];
+} cdp_input_trace_t;
+
+typedef enum {
+    CDP_EVENT_SEND_NEIGHBOR,
+    CDP_EVENT_SEND_KEEPALIVE,
+} cdp_process_event_t;
+
+
+cdp_error_t cdp_input (vlib_main_t * vm, vlib_buffer_t * b0, u32 bi0);
+void cdp_periodic (vlib_main_t * vm);
+void cdp_keepalive (cdp_main_t * cm, cdp_neighbor_t * n);
+u16 cdp_checksum (void *p, int count);
+u8 * cdp_input_format_trace (u8 * s, va_list * args);
+
+serialize_function_t serialize_cdp_main, unserialize_cdp_main;
+
+#endif /* __included_cdp_node_h__ */