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authorDave Barach <dave@barachs.net>2018-03-10 14:57:00 -0500
committerDave Barach <dave@barachs.net>2018-03-10 15:27:58 -0500
commitaaacfbc5b15b0653489ad2e80db48151a4375ece (patch)
treecbe4228c1e674116563229e52bc5e9d73229b5af /src/vnet/cdp/cdp_periodic.c
parentfde0929d9362eac5c416f658e1d2031d01a02337 (diff)
Move the vnet cdp protocol implementation to a plugin
Add a binary API and debug cli to enable/disable cdp. cdp is disabled by default. Change-Id: I307c7e38dfda38e36ff3325f65de7036c34d89b1 Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/vnet/cdp/cdp_periodic.c')
-rw-r--r--src/vnet/cdp/cdp_periodic.c515
1 files changed, 0 insertions, 515 deletions
diff --git a/src/vnet/cdp/cdp_periodic.c b/src/vnet/cdp/cdp_periodic.c
deleted file mode 100644
index 8899c49ce9c..00000000000
--- a/src/vnet/cdp/cdp_periodic.c
+++ /dev/null
@@ -1,515 +0,0 @@
-/*
- * 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 <vppinfra/hash.h>
-#include <vnet/unix/pcap.h>
-#include <vnet/srp/srp.h>
-#include <vnet/ppp/ppp.h>
-#include <vnet/hdlc/hdlc.h>
-#include <vnet/srp/packet.h>
-
-/*
- * Generate a set of specific CDP TLVs.
- *
- * $$$ eventually these need to fish better data from
- * other data structures; e.g. the hostname, software version info
- * etc.
- */
-
-static void
-add_device_name_tlv (vnet_hw_interface_t * hw, u8 ** t0p)
-{
- cdp_tlv_t *t = (cdp_tlv_t *) * t0p;
-
- t->t = htons (CDP_TLV_device_name);
- t->l = htons (3 + sizeof (*t));
- clib_memcpy (&t->v, "VPP", 3);
-
- *t0p += ntohs (t->l);
-}
-
-static void
-add_port_id_tlv (vnet_hw_interface_t * hw, u8 ** t0p)
-{
- cdp_tlv_t *t = (cdp_tlv_t *) * t0p;
-
- t->t = htons (CDP_TLV_port_id);
- t->l = htons (vec_len (hw->name) + sizeof (*t));
- clib_memcpy (&t->v, hw->name, vec_len (hw->name));
- *t0p += ntohs (t->l);
-}
-
-static void
-add_version_tlv (vnet_hw_interface_t * hw, u8 ** t0p)
-{
- cdp_tlv_t *t = (cdp_tlv_t *) * t0p;
-
- t->t = htons (CDP_TLV_version);
- t->l = htons (12 + sizeof (*t));
- clib_memcpy (&t->v, "VPP Software", 12);
- *t0p += ntohs (t->l);
-}
-
-static void
-add_platform_tlv (vnet_hw_interface_t * hw, u8 ** t0p)
-{
- cdp_tlv_t *t = (cdp_tlv_t *) * t0p;
-
- t->t = htons (CDP_TLV_platform);
- t->l = htons (2 + sizeof (*t));
- clib_memcpy (&t->v, "SW", 2);
- *t0p += ntohs (t->l);
-}
-
-static void
-add_capability_tlv (vnet_hw_interface_t * hw, u8 ** t0p)
-{
- cdp_tlv_t *t = (cdp_tlv_t *) * t0p;
- u32 capabilities;
-
- t->t = htons (CDP_TLV_capabilities);
- t->l = htons (4 + sizeof (*t));
- capabilities = CDP_ROUTER_DEVICE;
- capabilities = htonl (capabilities);
- clib_memcpy (&t->v, &capabilities, sizeof (capabilities));
- *t0p += ntohs (t->l);
-}
-
-static void
-add_tlvs (cdp_main_t * cm, vnet_hw_interface_t * hw, u8 ** t0p)
-{
- add_device_name_tlv (hw, t0p);
- add_port_id_tlv (hw, t0p);
- add_version_tlv (hw, t0p);
- add_platform_tlv (hw, t0p);
- add_capability_tlv (hw, t0p);
-}
-
-/*
- * send a cdp pkt on an ethernet interface
- */
-static void
-send_ethernet_hello (cdp_main_t * cm, cdp_neighbor_t * n, int count)
-{
- u32 *to_next;
- ethernet_llc_snap_and_cdp_header_t *h0;
- vnet_hw_interface_t *hw;
- u32 bi0;
- vlib_buffer_t *b0;
- u8 *t0;
- u16 checksum;
- int nbytes_to_checksum;
- int i;
- vlib_frame_t *f;
- vlib_main_t *vm = cm->vlib_main;
- vnet_main_t *vnm = cm->vnet_main;
-
- for (i = 0; i < count; i++)
- {
- /*
- * see cdp_periodic_init() to understand what's already painted
- * into the buffer by the packet template mechanism
- */
- h0 = vlib_packet_template_get_packet
- (vm, &cm->packet_templates[n->packet_template_index], &bi0);
-
- if (!h0)
- break;
-
- /* Add the interface's ethernet source address */
- hw = vnet_get_sup_hw_interface (vnm, n->sw_if_index);
-
- clib_memcpy (h0->ethernet.src_address, hw->hw_address,
- vec_len (hw->hw_address));
-
- t0 = (u8 *) & h0->cdp.data;
-
- /* add TLVs */
- add_tlvs (cm, hw, &t0);
-
- /* add the cdp packet checksum */
- nbytes_to_checksum = t0 - (u8 *) & h0->cdp;
- checksum = cdp_checksum (&h0->cdp, nbytes_to_checksum);
- h0->cdp.checksum = htons (checksum);
-
- /* Set the outbound packet length */
- b0 = vlib_get_buffer (vm, bi0);
- b0->current_length = nbytes_to_checksum + sizeof (*h0)
- - sizeof (cdp_hdr_t);
-
- /* And the outbound interface */
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = hw->sw_if_index;
-
- /* Set the 802.3 ethernet length */
- h0->ethernet.len = htons (b0->current_length
- - sizeof (ethernet_802_3_header_t));
-
- /* And output the packet on the correct interface */
- f = vlib_get_frame_to_node (vm, hw->output_node_index);
- to_next = vlib_frame_vector_args (f);
- to_next[0] = bi0;
- f->n_vectors = 1;
-
- vlib_put_frame_to_node (vm, hw->output_node_index, f);
- n->last_sent = vlib_time_now (vm);
- }
-}
-
-/*
- * send a cdp pkt on an hdlc interface
- */
-static void
-send_hdlc_hello (cdp_main_t * cm, cdp_neighbor_t * n, int count)
-{
- u32 *to_next;
- hdlc_and_cdp_header_t *h0;
- vnet_hw_interface_t *hw;
- u32 bi0;
- vlib_buffer_t *b0;
- u8 *t0;
- u16 checksum;
- int nbytes_to_checksum;
- int i;
- vlib_frame_t *f;
- vlib_main_t *vm = cm->vlib_main;
- vnet_main_t *vnm = cm->vnet_main;
-
- for (i = 0; i < count; i++)
- {
- /*
- * see cdp_periodic_init() to understand what's already painted
- * into the buffer by the packet template mechanism
- */
- h0 = vlib_packet_template_get_packet
- (vm, &cm->packet_templates[n->packet_template_index], &bi0);
-
- hw = vnet_get_sup_hw_interface (vnm, n->sw_if_index);
-
- t0 = (u8 *) & h0->cdp.data;
-
- /* add TLVs */
- add_tlvs (cm, hw, &t0);
-
- /* add the cdp packet checksum */
- nbytes_to_checksum = t0 - (u8 *) & h0->cdp;
- checksum = cdp_checksum (&h0->cdp, nbytes_to_checksum);
- h0->cdp.checksum = htons (checksum);
-
- /* Set the outbound packet length */
- b0 = vlib_get_buffer (vm, bi0);
- b0->current_length = nbytes_to_checksum + sizeof (*h0)
- - sizeof (cdp_hdr_t);
-
- /* And output the packet on the correct interface */
- f = vlib_get_frame_to_node (vm, hw->output_node_index);
- to_next = vlib_frame_vector_args (f);
- to_next[0] = bi0;
- f->n_vectors = 1;
-
- vlib_put_frame_to_node (vm, hw->output_node_index, f);
- n->last_sent = vlib_time_now (vm);
- }
-}
-
-/*
- * send a cdp pkt on an srp interface
- */
-static void
-send_srp_hello (cdp_main_t * cm, cdp_neighbor_t * n, int count)
-{
- u32 *to_next;
- srp_and_cdp_header_t *h0;
- vnet_hw_interface_t *hw;
- u32 bi0;
- vlib_buffer_t *b0;
- u8 *t0;
- u16 checksum;
- int nbytes_to_checksum;
- int i;
- vlib_frame_t *f;
- vlib_main_t *vm = cm->vlib_main;
- vnet_main_t *vnm = cm->vnet_main;
-
- for (i = 0; i < count; i++)
- {
- /*
- * see cdp_periodic_init() to understand what's already painted
- * into the buffer by the packet template mechanism
- */
- h0 = vlib_packet_template_get_packet
- (vm, &cm->packet_templates[n->packet_template_index], &bi0);
-
- hw = vnet_get_sup_hw_interface (vnm, n->sw_if_index);
-
- t0 = (u8 *) & h0->cdp.data;
-
- /* add TLVs */
- add_tlvs (cm, hw, &t0);
-
- /* Add the interface's ethernet source address */
- clib_memcpy (h0->ethernet.src_address, hw->hw_address,
- vec_len (hw->hw_address));
-
- /* add the cdp packet checksum */
- nbytes_to_checksum = t0 - (u8 *) & h0->cdp;
- checksum = cdp_checksum (&h0->cdp, nbytes_to_checksum);
- h0->cdp.checksum = htons (checksum);
-
- /* Set the outbound packet length */
- b0 = vlib_get_buffer (vm, bi0);
- b0->current_length = nbytes_to_checksum + sizeof (*h0)
- - sizeof (cdp_hdr_t);
-
- /* And output the packet on the correct interface */
- f = vlib_get_frame_to_node (vm, hw->output_node_index);
- to_next = vlib_frame_vector_args (f);
- to_next[0] = bi0;
- f->n_vectors = 1;
-
- vlib_put_frame_to_node (vm, hw->output_node_index, f);
- n->last_sent = vlib_time_now (vm);
- }
-}
-
-/*
- * Decide which cdp packet template to use
- */
-static int
-pick_packet_template (cdp_main_t * cm, cdp_neighbor_t * n)
-{
- n->packet_template_index = CDP_PACKET_TEMPLATE_ETHERNET;
-
- return 0;
-}
-
-/* Send a cdp neighbor announcement */
-static void
-send_hello (cdp_main_t * cm, cdp_neighbor_t * n, int count)
-{
- if (n->packet_template_index == (u8) ~ 0)
- {
- /* If we don't know how to talk to this peer, don't try again */
- if (pick_packet_template (cm, n))
- {
- n->last_sent = 1e70;
- return;
- }
- }
-
- switch (n->packet_template_index)
- {
- case CDP_PACKET_TEMPLATE_ETHERNET:
- send_ethernet_hello (cm, n, count);
- break;
-
- case CDP_PACKET_TEMPLATE_HDLC:
- send_hdlc_hello (cm, n, count);
- break;
-
- case CDP_PACKET_TEMPLATE_SRP:
- send_srp_hello (cm, n, count);
- break;
-
- default:
- ASSERT (0);
- }
- n->last_sent = vlib_time_now (cm->vlib_main);
-}
-
-static void
-delete_neighbor (cdp_main_t * cm, cdp_neighbor_t * n, int want_broadcast)
-{
- hash_unset (cm->neighbor_by_sw_if_index, n->sw_if_index);
- vec_free (n->device_name);
- vec_free (n->version);
- vec_free (n->port_id);
- vec_free (n->platform);
- vec_free (n->last_rx_pkt);
- pool_put (cm->neighbors, n);
-}
-
-void
-cdp_periodic (vlib_main_t * vm)
-{
- cdp_main_t *cm = &cdp_main;
- cdp_neighbor_t *n;
- f64 now = vlib_time_now (vm);
- vnet_sw_interface_t *sw;
- static u32 *delete_list = 0;
- int i;
- static cdp_neighbor_t **n_list = 0;
-
- /* *INDENT-OFF* */
- pool_foreach (n, cm->neighbors,
- ({
- vec_add1 (n_list, n);
- }));
- /* *INDENT-ON* */
-
- /* Across all cdp neighbors known to the system */
- for (i = 0; i < vec_len (n_list); i++)
- {
- n = n_list[i];
-
- /* "no cdp run" provisioned on the interface? */
- if (n->disabled == 1)
- continue;
-
- sw = vnet_get_sw_interface (cm->vnet_main, n->sw_if_index);
-
- /* Interface shutdown or rx timeout? */
- if (!(sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
- || (now > (n->last_heard + (f64) n->ttl_in_seconds)))
- /* add to list of neighbors to delete */
- vec_add1 (delete_list, n - cm->neighbors);
- else if (n->last_sent == 0.0)
- /* First time, send 3 hellos */
- send_hello (cm, n, 3 /* three to begin with */ );
- else if (now > (n->last_sent + (((f64) n->ttl_in_seconds) / 6.0)))
- /* Normal keepalive, send one */
- send_hello (cm, n, 1 /* one as a keepalive */ );
- }
-
- for (i = 0; i < vec_len (delete_list); i++)
- {
- n = vec_elt_at_index (cm->neighbors, delete_list[i]);
- delete_neighbor (cm, n, 1);
- }
- if (delete_list)
- _vec_len (delete_list) = 0;
- if (n_list)
- _vec_len (n_list) = 0;
-}
-
-static clib_error_t *
-cdp_periodic_init (vlib_main_t * vm)
-{
- cdp_main_t *cm = &cdp_main;
-
- /* Create the ethernet cdp hello packet template */
- {
- ethernet_llc_snap_and_cdp_header_t h;
-
- memset (&h, 0, sizeof (h));
-
- /* Send to 01:00:0c:cc:cc */
- h.ethernet.dst_address[0] = 0x01;
- /* h.ethernet.dst_address[1] = 0x00; (memset) */
- h.ethernet.dst_address[2] = 0x0C;
- h.ethernet.dst_address[3] = 0xCC;
- h.ethernet.dst_address[4] = 0xCC;
- h.ethernet.dst_address[5] = 0xCC;
-
- /* leave src address blank (fill in at send time) */
-
- /* leave length blank (fill in at send time) */
-
- /* LLC */
- h.llc.dst_sap = h.llc.src_sap = 0xAA; /* SNAP */
- h.llc.control = 0x03; /* UI (no extended control bytes) */
-
- /* SNAP */
- /* h.snap.oui[0] = 0x00; (memset) */
- /* h.snap.oui[1] = 0x00; (memset) */
- h.snap.oui[2] = 0x0C; /* Cisco = 0x00000C */
- h.snap.protocol = htons (0x2000); /* CDP = 0x2000 */
-
- /* CDP */
- h.cdp.version = 2;
- h.cdp.ttl = 180;
-
- vlib_packet_template_init
- (vm, &cm->packet_templates[CDP_PACKET_TEMPLATE_ETHERNET],
- /* data */ &h,
- sizeof (h),
- /* alloc chunk size */ 8,
- "cdp-ethernet");
- }
-
-#if 0 /* retain for reference */
-
- /* Create the hdlc cdp hello packet template */
- {
- hdlc_and_cdp_header_t h;
-
- memset (&h, 0, sizeof (h));
-
- h.hdlc.address = 0x0f;
- /* h.hdlc.control = 0; (memset) */
- h.hdlc.protocol = htons (0x2000); /* CDP = 0x2000 */
-
- /* CDP */
- h.cdp.version = 2;
- h.cdp.ttl = 180;
-
- vlib_packet_template_init
- (vm, &cm->packet_templates[CDP_PACKET_TEMPLATE_HDLC],
- /* data */ &h,
- sizeof (h),
- /* alloc chunk size */ 8,
- "cdp-hdlc");
- }
-
- /* Create the srp cdp hello packet template */
- {
- srp_and_cdp_header_t h;
-
- memset (&h, 0, sizeof (h));
-
- /* Send to 01:00:0c:cc:cc */
- h.ethernet.dst_address[0] = 0x01;
- /* h.ethernet.dst_address[1] = 0x00; (memset) */
- h.ethernet.dst_address[2] = 0x0C;
- h.ethernet.dst_address[3] = 0xCC;
- h.ethernet.dst_address[4] = 0xCC;
- h.ethernet.dst_address[5] = 0xCC;
-
- /* leave src address blank (fill in at send time) */
-
- /* The srp header is filled in at xmt */
- h.srp.ttl = 1;
- h.srp.priority = 7;
- h.srp.mode = SRP_MODE_data;
- srp_header_compute_parity (&h.srp);
-
- /* Inner ring and parity will be set at send time */
-
- h.ethernet.type = htons (0x2000); /* CDP = 0x2000 */
-
- /* CDP */
- h.cdp.version = 2;
- h.cdp.ttl = 180;
-
- vlib_packet_template_init
- (vm, &cm->packet_templates[CDP_PACKET_TEMPLATE_SRP],
- /* data */ &h,
- sizeof (h),
- /* alloc chunk size */ 8,
- "cdp-srp");
- }
-#endif
-
- return 0;
-}
-
-VLIB_INIT_FUNCTION (cdp_periodic_init);
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */