1 files changed, 359 insertions, 0 deletions

diff --git a/src/plugins/lacp/input.c b/src/plugins/lacp/input.c
new file mode 100644
index 00000000000..45db3b8455b
--- /dev/null
+++ b/src/plugins/lacp/input.c
@@ -0,0 +1,359 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+
+#define _GNU_SOURCE
+#include <vnet/bonding/node.h>
+#include <lacp/node.h>
+
+static int
+lacp_packet_scan (vlib_main_t * vm, slave_if_t * sif)
+{
+  lacp_pdu_t *lacpdu = (lacp_pdu_t *) sif->last_rx_pkt;
+
+  if (lacpdu->subtype != LACP_SUBTYPE)
+    return LACP_ERROR_UNSUPPORTED;
+
+  /*
+   * According to the spec, no checking on the version number and tlv types.
+   * But we may check the tlv lengths.
+   */
+  if ((lacpdu->actor.tlv_length != sizeof (lacp_actor_partner_t)) ||
+      (lacpdu->partner.tlv_length != sizeof (lacp_actor_partner_t)) ||
+      (lacpdu->collector.tlv_length != sizeof (lacp_collector_t)) ||
+      (lacpdu->terminator.tlv_length != 0))
+    return (LACP_ERROR_BAD_TLV);
+
+  lacp_machine_dispatch (&lacp_rx_machine, vm, sif,
+			 LACP_RX_EVENT_PDU_RECEIVED, &sif->rx_state);
+
+  return LACP_ERROR_NONE;
+}
+
+static void
+marker_fill_pdu (marker_pdu_t * marker, slave_if_t * sif)
+{
+  marker_pdu_t *pkt = (marker_pdu_t *) sif->last_marker_pkt;
+
+  marker->marker_info = pkt->marker_info;
+  marker->marker_info.tlv_type = MARKER_RESPONSE_INFORMATION;
+}
+
+void
+marker_fill_request_pdu (marker_pdu_t * marker, slave_if_t * sif)
+{
+  marker->marker_info.tlv_type = MARKER_INFORMATION;
+  marker->marker_info.requester_port = sif->actor.port_number;
+  clib_memcpy (marker->marker_info.requester_system, sif->actor.system, 6);
+  marker->marker_info.requester_transaction_id = sif->marker_tx_id;
+  sif->marker_tx_id++;
+}
+
+static void
+send_ethernet_marker_response_pdu (slave_if_t * sif)
+{
+  lacp_main_t *lm = &lacp_main;
+  u32 *to_next;
+  ethernet_marker_pdu_t *h0;
+  vnet_hw_interface_t *hw;
+  u32 bi0;
+  vlib_buffer_t *b0;
+  vlib_frame_t *f;
+  vlib_main_t *vm = lm->vlib_main;
+  vnet_main_t *vnm = lm->vnet_main;
+
+  /*
+   * see lacp_periodic_init() to understand what's already painted
+   * into the buffer by the packet template mechanism
+   */
+  h0 = vlib_packet_template_get_packet
+    (vm, &lm->marker_packet_templates[sif->packet_template_index], &bi0);
+
+  if (!h0)
+    return;
+
+  /* Add the interface's ethernet source address */
+  hw = vnet_get_sup_hw_interface (vnm, sif->sw_if_index);
+
+  clib_memcpy (h0->ethernet.src_address, hw->hw_address,
+	       vec_len (hw->hw_address));
+
+  marker_fill_pdu (&h0->marker, sif);
+
+  /* Set the outbound packet length */
+  b0 = vlib_get_buffer (vm, bi0);
+  b0->current_length = sizeof (ethernet_marker_pdu_t);
+  b0->current_data = 0;
+  b0->total_length_not_including_first_buffer = 0;
+
+  /* And the outbound interface */
+  vnet_buffer (b0)->sw_if_index[VLIB_TX] = hw->sw_if_index;
+
+  /* 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);
+}
+
+static int
+handle_marker_protocol (vlib_main_t * vm, slave_if_t * sif)
+{
+  marker_pdu_t *marker = (marker_pdu_t *) sif->last_marker_pkt;
+
+  /*
+   * According to the spec, no checking on the version number and tlv types.
+   * But we may check the tlv lengths.
+   */
+  if ((marker->marker_info.tlv_length != sizeof (marker_information_t)) ||
+      (marker->terminator.tlv_length != 0))
+    return (LACP_ERROR_BAD_TLV);
+
+  send_ethernet_marker_response_pdu (sif);
+
+  return LACP_ERROR_NONE;
+}
+
+/*
+ * lacp input routine
+ */
+lacp_error_t
+lacp_input (vlib_main_t * vm, vlib_buffer_t * b0, u32 bi0)
+{
+  lacp_main_t *lm = &lacp_main;
+  slave_if_t *sif;
+  uword nbytes;
+  lacp_error_t e;
+  marker_pdu_t *marker;
+  uword last_packet_signature;
+  bond_if_t *bif;
+
+  sif =
+    bond_get_slave_by_sw_if_index (vnet_buffer (b0)->sw_if_index[VLIB_RX]);
+  if ((sif == 0) || (sif->mode != BOND_MODE_LACP))
+    {
+      return LACP_ERROR_DISABLED;
+    }
+
+  /* Handle marker protocol */
+  marker = (marker_pdu_t *) (b0->data + b0->current_data);
+  if (marker->subtype == MARKER_SUBTYPE)
+    {
+      if (sif->last_marker_pkt)
+	_vec_len (sif->last_marker_pkt) = 0;
+      vec_validate (sif->last_marker_pkt,
+		    vlib_buffer_length_in_chain (vm, b0) - 1);
+      nbytes = vlib_buffer_contents (vm, bi0, sif->last_marker_pkt);
+      ASSERT (nbytes <= vec_len (sif->last_marker_pkt));
+      if (nbytes < sizeof (lacp_pdu_t))
+	return LACP_ERROR_TOO_SMALL;
+      return (handle_marker_protocol (vm, sif));
+    }
+
+  /*
+   * typical clib idiom. Don't repeatedly allocate and free
+   * the per-neighbor rx buffer. Reset its apparent length to zero
+   * and reuse it.
+   */
+  if (sif->last_rx_pkt)
+    _vec_len (sif->last_rx_pkt) = 0;
+
+  /*
+   * Make sure the per-neighbor rx buffer is big enough to hold
+   * the data we're about to copy
+   */
+  vec_validate (sif->last_rx_pkt, vlib_buffer_length_in_chain (vm, b0) - 1);
+
+  /*
+   * Coalesce / copy the buffer chain into the per-neighbor
+   * rx buffer
+   */
+  nbytes = vlib_buffer_contents (vm, bi0, sif->last_rx_pkt);
+  ASSERT (nbytes <= vec_len (sif->last_rx_pkt));
+
+  if (nbytes < sizeof (lacp_pdu_t))
+    {
+      return LACP_ERROR_TOO_SMALL;
+    }
+
+  last_packet_signature =
+    hash_memory (sif->last_rx_pkt, vec_len (sif->last_rx_pkt), 0xd00b);
+
+  bif = bond_get_master_by_dev_instance (sif->bif_dev_instance);
+  if (sif->last_packet_signature_valid &&
+      (sif->last_packet_signature == last_packet_signature) &&
+      hash_get (bif->active_slave_by_sw_if_index, sif->sw_if_index))
+    {
+      lacp_start_current_while_timer (lm->vlib_main, sif,
+				      sif->ttl_in_seconds);
+      e = LACP_ERROR_CACHE_HIT;
+    }
+  else
+    {
+      /* Actually scan the packet */
+      e = lacp_packet_scan (vm, sif);
+      sif->last_packet_signature_valid = 1;
+      sif->last_packet_signature = last_packet_signature;
+    }
+
+  if (sif->last_rx_pkt)
+    _vec_len (sif->last_rx_pkt) = 0;
+
+  return e;
+}
+
+/*
+ * setup neighbor hash table
+ */
+static clib_error_t *
+lacp_init (vlib_main_t * vm)
+{
+  clib_error_t *error;
+
+  if ((error = vlib_call_init_function (vm, lacp_periodic_init)))
+    return error;
+
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (lacp_init);
+
+/*
+ * packet trace format function, very similar to
+ * lacp_packet_scan except that we call the per TLV format
+ * functions instead of the per TLV processing functions
+ */
+u8 *
+lacp_input_format_trace (u8 * s, va_list * args)
+{
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  lacp_input_trace_t *t = va_arg (*args, lacp_input_trace_t *);
+  lacp_pdu_t *lacpdu = &t->pkt.lacpdu;
+  marker_pdu_t *marker = &t->pkt.marker;
+  int i, len;
+  u8 *p;
+  lacp_state_struct *state_entry;
+
+  s = format (s, "Length: %d\n", t->len);
+  if (t->len >= sizeof (lacp_pdu_t))
+    {
+      switch (lacpdu->subtype)
+	{
+	case MARKER_SUBTYPE:
+	  if (marker->version_number == MARKER_PROTOCOL_VERSION)
+	    s = format (s, "  Markerv1\n");
+	  else
+	    s = format (s, "  Subtype %u, Version %u\n", marker->subtype,
+			marker->version_number);
+	  s = format (s, "  Marker Information TLV: type %u\n",
+		      marker->marker_info.tlv_type);
+	  s = format (s, "  Marker Information TLV: length %u\n",
+		      marker->marker_info.tlv_length);
+	  s = format (s, "  Requester port: %u\n",
+		      marker->marker_info.requester_port);
+	  s = format (s, "  Requester system: %U\n", format_ethernet_address,
+		      marker->marker_info.requester_system);
+	  s = format (s, "  Requester transaction ID: %u\n",
+		      marker->marker_info.requester_transaction_id);
+	  break;
+
+	case LACP_SUBTYPE:
+	  if (lacpdu->version_number == LACP_ACTOR_LACP_VERSION)
+	    s = format (s, "  LACPv1\n");
+	  else
+	    s = format (s, "  Subtype %u, Version %u\n", lacpdu->subtype,
+			lacpdu->version_number);
+	  s = format (s, "  Actor Information TLV: length %u\n",
+		      lacpdu->actor.tlv_length);
+	  s = format (s, "    System %U\n", format_ethernet_address,
+		      lacpdu->actor.port_info.system);
+	  s = format (s, "    System priority %u\n",
+		      ntohs (lacpdu->actor.port_info.system_priority));
+	  s = format (s, "    Key %u\n", ntohs (lacpdu->actor.port_info.key));
+	  s = format (s, "    Port priority %u\n",
+		      ntohs (lacpdu->actor.port_info.port_priority));
+	  s = format (s, "    Port number %u\n",
+		      ntohs (lacpdu->actor.port_info.port_number));
+	  s = format (s, "    State 0x%x\n", lacpdu->actor.port_info.state);
+	  state_entry = (lacp_state_struct *) & lacp_state_array;
+	  while (state_entry->str)
+	    {
+	      if (lacpdu->actor.port_info.state & (1 << state_entry->bit))
+		s = format (s, "      %s (%d)\n", state_entry->str,
+			    state_entry->bit);
+	      state_entry++;
+	    }
+
+	  s = format (s, "  Partner Information TLV: length %u\n",
+		      lacpdu->partner.tlv_length);
+	  s = format (s, "    System %U\n", format_ethernet_address,
+		      lacpdu->partner.port_info.system);
+	  s = format (s, "    System priority %u\n",
+		      ntohs (lacpdu->partner.port_info.system_priority));
+	  s =
+	    format (s, "    Key %u\n", ntohs (lacpdu->partner.port_info.key));
+	  s =
+	    format (s, "    Port priority %u\n",
+		    ntohs (lacpdu->partner.port_info.port_priority));
+	  s =
+	    format (s, "    Port number %u\n",
+		    ntohs (lacpdu->partner.port_info.port_number));
+	  s = format (s, "    State 0x%x\n", lacpdu->partner.port_info.state);
+	  state_entry = (lacp_state_struct *) & lacp_state_array;
+	  while (state_entry->str)
+	    {
+	      if (lacpdu->partner.port_info.state & (1 << state_entry->bit))
+		s = format (s, "      %s (%d)\n", state_entry->str,
+			    state_entry->bit);
+	      state_entry++;
+	    }
+	  break;
+
+	default:
+	  break;
+	}
+    }
+
+  if (t->len > sizeof (lacp_pdu_t))
+    len = sizeof (lacp_pdu_t);
+  else
+    len = t->len;
+  p = (u8 *) lacpdu;
+  for (i = 0; i < len; i++)
+    {
+      if ((i % 16) == 0)
+	{
+	  if (i)
+	    s = format (s, "\n");
+	  s = format (s, "  0x%04x: ", i);
+	}
+      if ((i % 2) == 0)
+	s = format (s, " ");
+      s = format (s, "%02x", p[i]);
+    }
+
+  return s;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */