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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
15 #include <vnet/cdp/cdp_node.h>
16 #include <vnet/ethernet/packet.h>
18 static vlib_node_registration_t cdp_process_node;
22 2 x CDP graph nodes: an "interior" node to process
23 incoming announcements, and a "process" node to periodically
26 The interior node is neither pipelined nor dual-looped, because
27 it would be very unusual to see more than one CDP packet in
28 a given input frame. So, it's a very simple / straighforward
33 * packet counter strings
34 * Dump these counters via the "show error" CLI command
36 static char * cdp_error_strings[] = {
37 #define _(sym,string) string,
43 * We actually send all cdp pkts to the "error" node after scanning
44 * them, so the graph node has only one next-index. The "error-drop"
45 * node automatically bumps our per-node packet counters for us.
48 CDP_INPUT_NEXT_NORMAL,
53 * Process a frame of cdp packets
54 * Expect 1 packet / frame
57 cdp_node_fn (vlib_main_t * vm,
58 vlib_node_runtime_t * node,
61 u32 n_left_from, * from;
62 cdp_input_trace_t * t0;
64 from = vlib_frame_vector_args (frame); /* array of buffer indices */
65 n_left_from = frame->n_vectors; /* number of buffer indices */
67 while (n_left_from > 0)
74 b0 = vlib_get_buffer (vm, bi0);
76 next0 = CDP_INPUT_NEXT_NORMAL;
78 /* scan this cdp pkt. error0 is the counter index to bump */
79 error0 = cdp_input (vm, b0, bi0);
80 b0->error = node->errors[error0];
82 /* If this pkt is traced, snapshoot the data */
83 if (b0->flags & VLIB_BUFFER_IS_TRACED) {
85 t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
86 len = (b0->current_length < sizeof (t0->data))
87 ? b0->current_length : sizeof (t0->data);
89 clib_memcpy (t0->data, vlib_buffer_get_current (b0), len);
91 /* push this pkt to the next graph node, always error-drop */
92 vlib_set_next_frame_buffer (vm, node, next0, bi0);
98 return frame->n_vectors;
102 * cdp input graph node declaration
104 VLIB_REGISTER_NODE (cdp_input_node, static) = {
105 .function = cdp_node_fn,
107 .vector_size = sizeof (u32),
108 .type = VLIB_NODE_TYPE_INTERNAL,
110 .n_errors = CDP_N_ERROR,
111 .error_strings = cdp_error_strings,
113 .format_trace = cdp_input_format_trace,
115 .n_next_nodes = CDP_INPUT_N_NEXT,
117 [CDP_INPUT_NEXT_NORMAL] = "error-drop",
122 * cdp periodic function
125 cdp_process (vlib_main_t * vm,
126 vlib_node_runtime_t * rt,
129 cdp_main_t * cm = &cdp_main;
130 f64 poll_time_remaining;
131 uword event_type, * event_data = 0;
133 /* So we can send events to the cdp process */
134 cm->cdp_process_node_index = cdp_process_node.index;
136 /* Dynamically register the cdp input node with the snap classifier */
137 snap_register_input_protocol (vm, "cdp-input",
138 0xC /* ieee_oui, Cisco */,
139 0x2000 /* protocol CDP */,
140 cdp_input_node.index);
142 snap_register_input_protocol (vm, "cdp-input",
143 0xC /* ieee_oui, Cisco */,
144 0x2004 /* protocol CDP */,
145 cdp_input_node.index);
147 #if 0 /* retain for reference */
148 /* with the hdlc classifier */
149 hdlc_register_input_protocol (vm, HDLC_PROTOCOL_cdp,
150 cdp_input_node.index);
153 /* with ethernet input (for SRP) */
154 ethernet_register_input_type (vm, ETHERNET_TYPE_CDP /* CDP */,
155 cdp_input_node.index);
157 poll_time_remaining = 10.0 /* seconds */;
159 /* sleep until next poll time, or msg serialize event occurs */
160 poll_time_remaining =
161 vlib_process_wait_for_event_or_clock (vm, poll_time_remaining);
163 event_type = vlib_process_get_events (vm, &event_data);
164 switch (event_type) {
165 case ~0: /* no events => timeout */
169 clib_warning ("BUG: event type 0x%wx", event_type);
173 _vec_len (event_data) = 0;
175 /* peer timeout scan, send announcements */
176 if (vlib_process_suspend_time_is_zero (poll_time_remaining)) {
178 poll_time_remaining = 10.0;
186 * cdp periodic node declaration
188 VLIB_REGISTER_NODE (cdp_process_node, static) = {
189 .function = cdp_process,
190 .type = VLIB_NODE_TYPE_PROCESS,
191 .name = "cdp-process",
194 void vnet_cdp_node_reference(void) { }