ip: Protocol Independent IP Neighbors

Type: feature

 - ip-neighbour: generic neighbour handling; APIs, DBs, event handling,
aging
 - arp: ARP protocol implementation
 - ip6-nd; IPv6 neighbor discovery implementation; separate ND,
MLD, RA
 - ip6-link; manage link-local addresses
 - l2-arp-term; events separated from IP neighbours, since they are not
the same.

vnet retains just enough education to perform ND/ARP packet
construction.
arp and ip6-nd to be moved to plugins soon.

Change-Id: I88dedd0006b299344f4c7024a0aa5baa6b9a8bbe
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/src/vnet/ip-neighbor/ip4_neighbor.h b/src/vnet/ip-neighbor/ip4_neighbor.h
new file mode 100644
index 00000000000..c52e2d446af
--- /dev/null
+++ b/src/vnet/ip-neighbor/ip4_neighbor.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2019 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.
+ */
+
+#ifndef __IP4_NEIGHBOR_H__
+#define __IP4_NEIGHBOR_H__
+
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/arp_packet.h>
+
+extern void ip4_neighbor_probe_dst (const ip_adjacency_t * adj,
+				    const ip4_address_t * dst);
+extern void ip4_neighbor_advertise (vlib_main_t * vm,
+				    vnet_main_t * vnm,
+				    u32 sw_if_index,
+				    const ip4_address_t * addr);
+
+always_inline vlib_buffer_t *
+ip4_neighbor_probe (vlib_main_t * vm,
+		    vnet_main_t * vnm,
+		    const ip_adjacency_t * adj0,
+		    const ip4_address_t * src, const ip4_address_t * dst)
+{
+  vnet_hw_interface_t *hw_if0;
+  ethernet_arp_header_t *h0;
+  vlib_buffer_t *b0;
+  u32 bi0;
+
+  /* Send ARP request. */
+  h0 = vlib_packet_template_get_packet (vm,
+					&ip4_main.ip4_arp_request_packet_template,
+					&bi0);
+  /* Seems we're out of buffers */
+  if (PREDICT_FALSE (!h0))
+    return (NULL);
+
+  b0 = vlib_get_buffer (vm, bi0);
+
+  /* Add rewrite/encap string for ARP packet. */
+  vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
+
+  hw_if0 = vnet_get_sup_hw_interface (vnm, adj0->rewrite_header.sw_if_index);
+
+  /* Src ethernet address in ARP header. */
+  mac_address_from_bytes (&h0->ip4_over_ethernet[0].mac, hw_if0->hw_address);
+
+  h0->ip4_over_ethernet[0].ip4 = *src;
+  h0->ip4_over_ethernet[1].ip4 = *dst;
+
+  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+  vnet_buffer (b0)->sw_if_index[VLIB_TX] = adj0->rewrite_header.sw_if_index;
+
+  vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
+
+  {
+    vlib_frame_t *f = vlib_get_frame_to_node (vm, hw_if0->output_node_index);
+    u32 *to_next = vlib_frame_vector_args (f);
+    to_next[0] = bi0;
+    f->n_vectors = 1;
+    vlib_put_frame_to_node (vm, hw_if0->output_node_index, f);
+  }
+
+  return b0;
+}
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */