--- /dev/null
+/*
+ * Copyright (c) 2011-2018 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.
+ */
+#include <cdp/cdp.h>
+#include <vnet/ethernet/packet.h>
+
+/** \file
+
+ 2 x CDP graph nodes: an "interior" node to process
+ incoming announcements, and a "process" node to periodically
+ send announcements.
+
+ The interior node is neither pipelined nor dual-looped, because
+ it would be very unusual to see more than one CDP packet in
+ a given input frame. So, it's a very simple / straighforward
+ example.
+*/
+
+/*
+ * packet counter strings
+ * Dump these counters via the "show error" CLI command
+ */
+static char *cdp_error_strings[] = {
+#define _(sym,string) string,
+ foreach_cdp_error
+#undef _
+};
+
+/*
+ * We actually send all cdp pkts to the "error" node after scanning
+ * them, so the graph node has only one next-index. The "error-drop"
+ * node automatically bumps our per-node packet counters for us.
+ */
+typedef enum
+{
+ CDP_INPUT_NEXT_NORMAL,
+ CDP_INPUT_N_NEXT,
+} cdp_next_t;
+
+/*
+ * Process a frame of cdp packets
+ * Expect 1 packet / frame
+ */
+static uword
+cdp_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from;
+ cdp_input_trace_t *t0;
+
+ from = vlib_frame_vector_args (frame); /* array of buffer indices */
+ n_left_from = frame->n_vectors; /* number of buffer indices */
+
+ while (n_left_from > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0, error0;
+
+ bi0 = from[0];
+ b0 = vlib_get_buffer (vm, bi0);
+
+ next0 = CDP_INPUT_NEXT_NORMAL;
+
+ /* scan this cdp pkt. error0 is the counter index to bump */
+ error0 = cdp_input (vm, b0, bi0);
+ b0->error = node->errors[error0];
+
+ /* If this pkt is traced, snapshoot the data */
+ if (b0->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ int len;
+ t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
+ len = (b0->current_length < sizeof (t0->data))
+ ? b0->current_length : sizeof (t0->data);
+ t0->len = len;
+ clib_memcpy (t0->data, vlib_buffer_get_current (b0), len);
+ }
+ /* push this pkt to the next graph node, always error-drop */
+ vlib_set_next_frame_buffer (vm, node, next0, bi0);
+
+ from += 1;
+ n_left_from -= 1;
+ }
+
+ return frame->n_vectors;
+}
+
+/*
+ * cdp input graph node declaration
+ */
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (cdp_input_node, static) = {
+ .function = cdp_node_fn,
+ .name = "cdp-input",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = CDP_N_ERROR,
+ .error_strings = cdp_error_strings,
+
+ .format_trace = cdp_input_format_trace,
+
+ .n_next_nodes = CDP_INPUT_N_NEXT,
+ .next_nodes = {
+ [CDP_INPUT_NEXT_NORMAL] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+/*
+ * cdp periodic function
+ */
+static uword
+cdp_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
+{
+ cdp_main_t *cm = &cdp_main;
+ f64 poll_time_remaining;
+ uword event_type, *event_data = 0;
+
+ /* So we can send events to the cdp process */
+ cm->cdp_process_node_index = cdp_process_node.index;
+
+ /* Dynamically register the cdp input node with the snap classifier */
+ snap_register_input_protocol (vm, "cdp-input", 0xC /* ieee_oui, Cisco */ ,
+ 0x2000 /* protocol CDP */ ,
+ cdp_input_node.index);
+
+ snap_register_input_protocol (vm, "cdp-input", 0xC /* ieee_oui, Cisco */ ,
+ 0x2004 /* protocol CDP */ ,
+ cdp_input_node.index);
+
+#if 0 /* retain for reference */
+ /* with the hdlc classifier */
+ hdlc_register_input_protocol (vm, HDLC_PROTOCOL_cdp, cdp_input_node.index);
+#endif
+
+ /* with ethernet input (for SRP) */
+ ethernet_register_input_type (vm, ETHERNET_TYPE_CDP /* CDP */ ,
+ cdp_input_node.index);
+
+ /* Start w/ cdp effectively disabled */
+ poll_time_remaining = 86400.0;
+
+ while (1)
+ {
+ /* sleep until next poll time, or msg serialize event occurs */
+ poll_time_remaining =
+ vlib_process_wait_for_event_or_clock (vm, poll_time_remaining);
+
+ event_type = vlib_process_get_events (vm, &event_data);
+ switch (event_type)
+ {
+ case ~0: /* no events => timeout */
+ break;
+
+ case CDP_EVENT_ENABLE:
+ poll_time_remaining = 10.0;
+ break;
+
+ case CDP_EVENT_DISABLE:
+ poll_time_remaining = 86400.0;
+ break;
+
+ default:
+ clib_warning ("BUG: event type 0x%wx", event_type);
+ break;
+ }
+ vec_reset_length (event_data);
+
+ /* peer timeout scan, send announcements */
+ if (vlib_process_suspend_time_is_zero (poll_time_remaining))
+ {
+ cdp_periodic (vm);
+ poll_time_remaining = 10.0;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * cdp periodic node declaration
+ */
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (cdp_process_node) = {
+ .function = cdp_process,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "cdp-process",
+};
+/* *INDENT-ON* */
+
+void
+vnet_cdp_node_reference (void)
+{
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff