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, 0 insertions, 343 deletions

diff --git a/src/vnet/ip/ip4_forward.c b/src/vnet/ip/ip4_forward.c
index bb036c8e969..aa554eab5fb 100644
--- a/src/vnet/ip/ip4_forward.c
+++ b/src/vnet/ip/ip4_forward.c
@@ -1930,349 +1930,6 @@ VLIB_CLI_COMMAND (show_ip_local, static) =
 };
 /* *INDENT-ON* */
 
-always_inline uword
-ip4_arp_inline (vlib_main_t * vm,
-		vlib_node_runtime_t * node,
-		vlib_frame_t * frame, int is_glean)
-{
-  vnet_main_t *vnm = vnet_get_main ();
-  ip4_main_t *im = &ip4_main;
-  ip_lookup_main_t *lm = &im->lookup_main;
-  u32 *from, *to_next_drop;
-  uword n_left_from, n_left_to_next_drop, next_index;
-  u32 thread_index = vm->thread_index;
-  u64 seed;
-
-  if (node->flags & VLIB_NODE_FLAG_TRACE)
-    ip4_forward_next_trace (vm, node, frame, VLIB_TX);
-
-  seed = throttle_seed (&im->arp_throttle, thread_index, vlib_time_now (vm));
-
-  from = vlib_frame_vector_args (frame);
-  n_left_from = frame->n_vectors;
-  next_index = node->cached_next_index;
-  if (next_index == IP4_ARP_NEXT_DROP)
-    next_index = IP4_ARP_N_NEXT;	/* point to first interface */
-
-  while (n_left_from > 0)
-    {
-      vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
-			   to_next_drop, n_left_to_next_drop);
-
-      while (n_left_from > 0 && n_left_to_next_drop > 0)
-	{
-	  u32 pi0, bi0, adj_index0, sw_if_index0;
-	  ip_adjacency_t *adj0;
-	  vlib_buffer_t *p0, *b0;
-	  ip4_address_t resolve0;
-	  ethernet_arp_header_t *h0;
-	  vnet_hw_interface_t *hw_if0;
-	  u64 r0;
-
-	  pi0 = from[0];
-	  p0 = vlib_get_buffer (vm, pi0);
-
-	  from += 1;
-	  n_left_from -= 1;
-	  to_next_drop[0] = pi0;
-	  to_next_drop += 1;
-	  n_left_to_next_drop -= 1;
-
-	  adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
-	  adj0 = adj_get (adj_index0);
-
-	  if (is_glean)
-	    {
-	      /* resolve the packet's destination */
-	      ip4_header_t *ip0 = vlib_buffer_get_current (p0);
-	      resolve0 = ip0->dst_address;
-	    }
-	  else
-	    {
-	      /* resolve the incomplete adj */
-	      resolve0 = adj0->sub_type.nbr.next_hop.ip4;
-	    }
-
-	  /* combine the address and interface for the hash key */
-	  sw_if_index0 = adj0->rewrite_header.sw_if_index;
-	  r0 = (u64) resolve0.data_u32 << 32;
-	  r0 |= sw_if_index0;
-
-	  if (throttle_check (&im->arp_throttle, thread_index, r0, seed))
-	    {
-	      p0->error = node->errors[IP4_ARP_ERROR_THROTTLED];
-	      continue;
-	    }
-
-	  /*
-	   * the adj has been updated to a rewrite but the node the DPO that got
-	   * us here hasn't - yet. no big deal. we'll drop while we wait.
-	   */
-	  if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
-	    {
-	      p0->error = node->errors[IP4_ARP_ERROR_RESOLVED];
-	      continue;
-	    }
-
-	  /*
-	   * Can happen if the control-plane is programming tables
-	   * with traffic flowing; at least that's today's lame excuse.
-	   */
-	  if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
-	      || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
-	    {
-	      p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
-	      continue;
-	    }
-	  /* Send ARP request. */
-	  h0 =
-	    vlib_packet_template_get_packet (vm,
-					     &im->ip4_arp_request_packet_template,
-					     &bi0);
-	  /* Seems we're out of buffers */
-	  if (PREDICT_FALSE (!h0))
-	    {
-	      p0->error = node->errors[IP4_ARP_ERROR_NO_BUFFERS];
-	      continue;
-	    }
-
-	  b0 = vlib_get_buffer (vm, bi0);
-
-	  /* copy the persistent fields from the original */
-	  clib_memcpy_fast (b0->opaque2, p0->opaque2, sizeof (p0->opaque2));
-
-	  /* 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, sw_if_index0);
-
-	  /* Src ethernet address in ARP header. */
-	  mac_address_from_bytes (&h0->ip4_over_ethernet[0].mac,
-				  hw_if0->hw_address);
-	  if (is_glean)
-	    {
-	      /* The interface's source address is stashed in the Glean Adj */
-	      h0->ip4_over_ethernet[0].ip4 =
-		adj0->sub_type.glean.receive_addr.ip4;
-	    }
-	  else
-	    {
-	      /* Src IP address in ARP header. */
-	      if (ip4_src_address_for_packet (lm, sw_if_index0,
-					      &h0->ip4_over_ethernet[0].ip4))
-		{
-		  /* No source address available */
-		  p0->error = node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
-		  vlib_buffer_free (vm, &bi0, 1);
-		  continue;
-		}
-	    }
-	  h0->ip4_over_ethernet[1].ip4 = resolve0;
-
-	  p0->error = node->errors[IP4_ARP_ERROR_REQUEST_SENT];
-
-	  vlib_buffer_copy_trace_flag (vm, p0, bi0);
-	  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
-	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
-
-	  vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
-
-	  vlib_set_next_frame_buffer (vm, node,
-				      adj0->rewrite_header.next_index, bi0);
-	}
-
-      vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
-    }
-
-  return frame->n_vectors;
-}
-
-VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
-			     vlib_frame_t * frame)
-{
-  return (ip4_arp_inline (vm, node, frame, 0));
-}
-
-VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
-			       vlib_frame_t * frame)
-{
-  return (ip4_arp_inline (vm, node, frame, 1));
-}
-
-static char *ip4_arp_error_strings[] = {
-  [IP4_ARP_ERROR_THROTTLED] = "ARP requests throttled",
-  [IP4_ARP_ERROR_RESOLVED] = "ARP requests resolved",
-  [IP4_ARP_ERROR_NO_BUFFERS] = "ARP requests out of buffer",
-  [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
-  [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
-  [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
-};
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip4_arp_node) =
-{
-  .name = "ip4-arp",
-  .vector_size = sizeof (u32),
-  .format_trace = format_ip4_forward_next_trace,
-  .n_errors = ARRAY_LEN (ip4_arp_error_strings),
-  .error_strings = ip4_arp_error_strings,
-  .n_next_nodes = IP4_ARP_N_NEXT,
-  .next_nodes =
-  {
-    [IP4_ARP_NEXT_DROP] = "error-drop",
-  },
-};
-
-VLIB_REGISTER_NODE (ip4_glean_node) =
-{
-  .name = "ip4-glean",
-  .vector_size = sizeof (u32),
-  .format_trace = format_ip4_forward_next_trace,
-  .n_errors = ARRAY_LEN (ip4_arp_error_strings),
-  .error_strings = ip4_arp_error_strings,
-  .n_next_nodes = IP4_ARP_N_NEXT,
-  .next_nodes = {
-  [IP4_ARP_NEXT_DROP] = "error-drop",
-  },
-};
-/* *INDENT-ON* */
-
-#define foreach_notrace_ip4_arp_error           \
-_(THROTTLED)                                    \
-_(RESOLVED)                                     \
-_(NO_BUFFERS)                                   \
-_(REQUEST_SENT)                                 \
-_(NON_ARP_ADJ)                                  \
-_(NO_SOURCE_ADDRESS)
-
-static clib_error_t *
-arp_notrace_init (vlib_main_t * vm)
-{
-  vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
-
-  /* don't trace ARP request packets */
-#define _(a)                                    \
-    vnet_pcap_drop_trace_filter_add_del         \
-        (rt->errors[IP4_ARP_ERROR_##a],         \
-         1 /* is_add */);
-  foreach_notrace_ip4_arp_error;
-#undef _
-  return 0;
-}
-
-VLIB_INIT_FUNCTION (arp_notrace_init);
-
-
-#ifndef CLIB_MARCH_VARIANT
-/* Send an ARP request to see if given destination is reachable on given interface. */
-clib_error_t *
-ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index,
-		    u8 refresh)
-{
-  vnet_main_t *vnm = vnet_get_main ();
-  ip4_main_t *im = &ip4_main;
-  ethernet_arp_header_t *h;
-  ip4_address_t *src;
-  ip_interface_address_t *ia;
-  ip_adjacency_t *adj;
-  vnet_hw_interface_t *hi;
-  vnet_sw_interface_t *si;
-  vlib_buffer_t *b;
-  adj_index_t ai;
-  u32 bi = 0;
-  u8 unicast_rewrite = 0;
-
-  si = vnet_get_sw_interface (vnm, sw_if_index);
-
-  if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
-    {
-      return clib_error_return (0, "%U: interface %U down",
-				format_ip4_address, dst,
-				format_vnet_sw_if_index_name, vnm,
-				sw_if_index);
-    }
-
-  src =
-    ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
-  if (!src)
-    {
-      vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
-      return clib_error_return
-	(0,
-	 "no matching interface address for destination %U (interface %U)",
-	 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
-	 sw_if_index);
-    }
-
-  h = vlib_packet_template_get_packet (vm,
-				       &im->ip4_arp_request_packet_template,
-				       &bi);
-
-  if (!h)
-    return clib_error_return (0, "ARP request packet allocation failed");
-
-  hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
-  if (PREDICT_FALSE (!hi->hw_address))
-    {
-      return clib_error_return (0, "%U: interface %U do not support ip probe",
-				format_ip4_address, dst,
-				format_vnet_sw_if_index_name, vnm,
-				sw_if_index);
-    }
-
-  mac_address_from_bytes (&h->ip4_over_ethernet[0].mac, hi->hw_address);
-
-  h->ip4_over_ethernet[0].ip4 = src[0];
-  h->ip4_over_ethernet[1].ip4 = dst[0];
-
-  b = vlib_get_buffer (vm, bi);
-  vnet_buffer (b)->sw_if_index[VLIB_RX] =
-    vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
-
-  ip46_address_t nh = {
-    .ip4 = *dst,
-  };
-
-  ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
-			    VNET_LINK_IP4, &nh, sw_if_index);
-  adj = adj_get (ai);
-
-  /* Peer has been previously resolved, retrieve glean adj instead */
-  if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
-    {
-      if (refresh)
-	unicast_rewrite = 1;
-      else
-	{
-	  adj_unlock (ai);
-	  ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4,
-				      VNET_LINK_IP4, sw_if_index, &nh);
-	  adj = adj_get (ai);
-	}
-    }
-
-  /* Add encapsulation string for software interface (e.g. ethernet header). */
-  vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
-  if (unicast_rewrite)
-    {
-      u16 *etype = vlib_buffer_get_current (b) - 2;
-      etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
-    }
-  vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
-
-  {
-    vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
-    u32 *to_next = vlib_frame_vector_args (f);
-    to_next[0] = bi;
-    f->n_vectors = 1;
-    vlib_put_frame_to_node (vm, hi->output_node_index, f);
-  }
-
-  adj_unlock (ai);
-  return /* no error */ 0;
-}
-#endif
-
 typedef enum
 {
   IP4_REWRITE_NEXT_DROP,