diff options
Diffstat (limited to 'src/vnet/cdp/cdp_node.c')
| -rw-r--r-- | src/vnet/cdp/cdp_node.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/vnet/cdp/cdp_node.c b/src/vnet/cdp/cdp_node.c new file mode 100644 index 00000000..39ac4a90 --- /dev/null +++ b/src/vnet/cdp/cdp_node.c @@ -0,0 +1,208 @@ +/* + * 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. + */ +#include <vnet/cdp/cdp_node.h> +#include <vnet/ethernet/packet.h> + +static vlib_node_registration_t cdp_process_node; + +/** \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); + + poll_time_remaining = 10.0 /* seconds */ ; + 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; + + default: + clib_warning ("BUG: event type 0x%wx", event_type); + break; + } + if (event_data) + _vec_len (event_data) = 0; + + /* 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, static) = { + .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: + */ |