Cisco Discovery Protocol, initial working attempt
[vpp.git] / vnet / vnet / cdp / cdp_node.h
1 /*
2  * Copyright (c) 2011-2016 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #ifndef __included_cdp_node_h__
16 #define __included_cdp_node_h__
17
18 #include <vlib/vlib.h>
19 #include <vlib/unix/unix.h>
20
21 #include <vnet/snap/snap.h>
22 #include <vnet/hdlc/hdlc.h>
23 #include <vnet/hdlc/packet.h>
24
25 #include <vppinfra/format.h>
26 #include <vppinfra/hash.h>
27
28 #include <vnet/cdp/cdp_protocol.h>
29
30 typedef enum {
31     CDP_PACKET_TEMPLATE_ETHERNET,
32     CDP_PACKET_TEMPLATE_HDLC,
33     CDP_PACKET_TEMPLATE_SRP,
34     CDP_N_PACKET_TEMPLATES,
35 } cdp_packet_template_id_t;
36
37 typedef struct {
38     /* neighbor's vlib software interface index */
39     u32 sw_if_index;
40
41     /* Timers */
42     f64 last_heard;
43     f64 last_sent;
44
45     /* Neighbor time-to-live (usually 180s) */
46     u8  ttl_in_seconds;
47
48     /* "no cdp run" or similar */
49     u8  disabled;
50
51     /* tx packet template id for this neighbor */
52     u8  packet_template_index;
53
54     /* Jenkins hash optimization: avoid tlv scan, send short keepalive msg */
55     u8  last_packet_signature_valid;
56     uword last_packet_signature;
57
58     /* Info we actually keep about each neighbor */
59     u8 *device_name;
60     u8 *version;
61     u8 *port_id;
62     u8 *platform;
63
64     /* last received packet, for the J-hash optimization */
65     u8 *last_rx_pkt;
66 } cdp_neighbor_t;
67
68 #define foreach_neighbor_string_field           \
69 _(device_name)                                  \
70 _(version)                                      \
71 _(port_id)                                      \
72 _(platform)
73
74 typedef struct {
75     /* pool of cdp neighbors */
76     cdp_neighbor_t *neighbors;
77
78     /* tx pcap debug enable */
79     u8 tx_pcap_debug;
80
81     /* rapidly find a neighbor by vlib software interface index */
82     uword *neighbor_by_sw_if_index;
83
84     /* Background process node index */
85     u32 cdp_process_node_index;
86
87     /* Packet templates for different encap types */
88     vlib_packet_template_t packet_templates [CDP_N_PACKET_TEMPLATES];
89
90     /* convenience variables */
91     vlib_main_t *vlib_main;
92     vnet_main_t *vnet_main;
93 } cdp_main_t;
94
95 cdp_main_t cdp_main;
96
97 /* Packet counters */
98 #define foreach_cdp_error                                       \
99 _ (NONE, "good cdp packets (processed)")                        \
100 _ (CACHE_HIT, "good cdp packets (cache hit)")                   \
101 _ (BAD_TLV, "cdp packets with bad TLVs")                        \
102 _ (PROTOCOL_VERSION, "cdp packets with bad protocol versions")  \
103 _ (CHECKSUM, "cdp packets with bad checksums")                  \
104 _ (DISABLED, "cdp packets received on disabled interfaces")
105
106 typedef enum {
107 #define _(sym,str) CDP_ERROR_##sym,
108   foreach_cdp_error
109 #undef _
110   CDP_N_ERROR,
111 } cdp_error_t;
112
113 /* cdp packet trace capture */
114 typedef struct {
115     u32 len;
116     u8  data[400];
117 } cdp_input_trace_t;
118
119 typedef enum {
120     CDP_EVENT_SEND_NEIGHBOR,
121     CDP_EVENT_SEND_KEEPALIVE,
122 } cdp_process_event_t;
123
124
125 cdp_error_t cdp_input (vlib_main_t * vm, vlib_buffer_t * b0, u32 bi0);
126 void cdp_periodic (vlib_main_t * vm);
127 void cdp_keepalive (cdp_main_t * cm, cdp_neighbor_t * n);
128 u16 cdp_checksum (void *p, int count);
129 u8 * cdp_input_format_trace (u8 * s, va_list * args);
130
131 serialize_function_t serialize_cdp_main, unserialize_cdp_main;
132
133 #endif /* __included_cdp_node_h__ */