dhcp: Move to plugin

Type: feature

Change-Id: I3fe27a8ef577741d9a5c4f090ec91cf68fb44fe3
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 437 insertions, 0 deletions

diff --git a/src/plugins/dhcp/dhcp6_pd_client_dp.c b/src/plugins/dhcp/dhcp6_pd_client_dp.c
new file mode 100644
index 00000000000..74a1f16000c
--- /dev/null
+++ b/src/plugins/dhcp/dhcp6_pd_client_dp.c
@@ -0,0 +1,437 @@
+/*
+ * Copyright (c) 2018 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 <vlib/vlib.h>
+#include <dhcp/dhcp6_packet.h>
+#include <dhcp/dhcp_proxy.h>
+#include <vnet/mfib/mfib_table.h>
+#include <vnet/mfib/ip6_mfib.h>
+#include <vnet/fib/fib.h>
+#include <vnet/adj/adj_mcast.h>
+#include <vnet/ip/ip6_neighbor.h>
+#include <dhcp/dhcp6_pd_client_dp.h>
+#include <dhcp/dhcp6_client_common_dp.h>
+#include <vnet/ip/ip_types_api.h>
+
+dhcp6_pd_client_main_t dhcp6_pd_client_main;
+dhcp6_pd_client_public_main_t dhcp6_pd_client_public_main;
+
+static void
+signal_report (prefix_report_t * r)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  uword ni = cm->publisher_node;
+  uword et = cm->publisher_et;
+
+  if (ni == (uword) ~ 0)
+    return;
+  prefix_report_t *q =
+    vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q);
+
+  *q = *r;
+}
+
+int
+dhcp6_pd_publish_report (prefix_report_t * r)
+{
+  void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
+  vl_api_rpc_call_main_thread (signal_report, (u8 *) r, sizeof *r);
+  return 0;
+}
+
+void
+dhcp6_pd_set_publisher_node (uword node_index, uword event_type)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  cm->publisher_node = node_index;
+  cm->publisher_et = event_type;
+}
+
+static void
+stop_sending_client_message (vlib_main_t * vm,
+			     dhcp6_pd_client_state_t * client_state)
+{
+  u32 bi0;
+
+  client_state->keep_sending_client_message = 0;
+  vec_free (client_state->params.prefixes);
+  if (client_state->buffer)
+    {
+      bi0 = vlib_get_buffer_index (vm, client_state->buffer);
+      vlib_buffer_free (vm, &bi0, 1);
+      client_state->buffer = 0;
+      adj_unlock (client_state->adj_index);
+      client_state->adj_index = ~0;
+    }
+}
+
+static vlib_buffer_t *
+create_buffer_for_client_message (vlib_main_t * vm,
+				  u32 sw_if_index,
+				  dhcp6_pd_client_state_t
+				  * client_state, u32 type)
+{
+  dhcp6_client_common_main_t *ccm = &dhcp6_client_common_main;
+  vnet_main_t *vnm = vnet_get_main ();
+
+  vlib_buffer_t *b;
+  u32 bi;
+  ip6_header_t *ip;
+  udp_header_t *udp;
+  dhcpv6_header_t *dhcp;
+  ip6_address_t src_addr;
+  u32 dhcp_opt_len = 0;
+  client_state->transaction_start = vlib_time_now (vm);
+  u32 n_prefixes;
+  u32 i;
+
+  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
+  vnet_sw_interface_t *sup_sw = vnet_get_sup_sw_interface (vnm, sw_if_index);
+  vnet_sw_interface_t *sw = vnet_get_sw_interface (vnm, sw_if_index);
+
+  /* Interface(s) down? */
+  if ((hw->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) == 0)
+    return NULL;
+  if ((sup_sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
+    return NULL;
+  if ((sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
+    return NULL;
+
+  /* Get a link-local address */
+  src_addr = ip6_neighbor_get_link_local_address (sw_if_index);
+
+  if (src_addr.as_u8[0] != 0xfe)
+    {
+      clib_warning ("Could not find source address to send DHCPv6 packet");
+      return NULL;
+    }
+
+  if (vlib_buffer_alloc (vm, &bi, 1) != 1)
+    {
+      clib_warning ("Buffer allocation failed");
+      return NULL;
+    }
+
+  b = vlib_get_buffer (vm, bi);
+  vnet_buffer (b)->sw_if_index[VLIB_RX] = sw_if_index;
+  vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
+  client_state->adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6,
+						   VNET_LINK_IP6,
+						   sw_if_index);
+  vnet_buffer (b)->ip.adj_index[VLIB_TX] = client_state->adj_index;
+  b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
+  ip = (ip6_header_t *) vlib_buffer_get_current (b);
+  udp = (udp_header_t *) (ip + 1);
+  dhcp = (dhcpv6_header_t *) (udp + 1);
+
+  ip->src_address = src_addr;
+  ip->hop_limit = 255;
+  ip->ip_version_traffic_class_and_flow_label =
+    clib_host_to_net_u32 (0x6 << 28);
+  ip->payload_length = 0;
+  ip->protocol = IP_PROTOCOL_UDP;
+
+  udp->src_port = clib_host_to_net_u16 (DHCPV6_CLIENT_PORT);
+  udp->dst_port = clib_host_to_net_u16 (DHCPV6_SERVER_PORT);
+  udp->checksum = 0;
+  udp->length = 0;
+
+  dhcp->msg_type = type;
+  dhcp->xid[0] = (client_state->transaction_id & 0x00ff0000) >> 16;
+  dhcp->xid[1] = (client_state->transaction_id & 0x0000ff00) >> 8;
+  dhcp->xid[2] = (client_state->transaction_id & 0x000000ff) >> 0;
+
+  void *d = (void *) dhcp->data;
+  dhcpv6_option_t *duid;
+  dhcpv6_elapsed_t *elapsed;
+  dhcpv6_ia_header_t *ia_hdr;
+  dhcpv6_ia_opt_pd_t *opt_pd;
+  if (type == DHCPV6_MSG_SOLICIT || type == DHCPV6_MSG_REQUEST ||
+      type == DHCPV6_MSG_RENEW || type == DHCPV6_MSG_REBIND ||
+      type == DHCPV6_MSG_RELEASE)
+    {
+      duid = (dhcpv6_option_t *) d;
+      duid->option = clib_host_to_net_u16 (DHCPV6_OPTION_CLIENTID);
+      duid->length = clib_host_to_net_u16 (CLIENT_DUID_LENGTH);
+      clib_memcpy (duid + 1, client_duid.bin_string, CLIENT_DUID_LENGTH);
+      d += sizeof (*duid) + CLIENT_DUID_LENGTH;
+
+      if (client_state->params.server_index != ~0)
+	{
+	  server_id_t *se =
+	    &ccm->server_ids[client_state->params.server_index];
+
+	  duid = (dhcpv6_option_t *) d;
+	  duid->option = clib_host_to_net_u16 (DHCPV6_OPTION_SERVERID);
+	  duid->length = clib_host_to_net_u16 (se->len);
+	  clib_memcpy (duid + 1, se->data, se->len);
+	  d += sizeof (*duid) + se->len;
+	}
+
+      elapsed = (dhcpv6_elapsed_t *) d;
+      elapsed->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_ELAPSED_TIME);
+      elapsed->opt.length =
+	clib_host_to_net_u16 (sizeof (*elapsed) - sizeof (elapsed->opt));
+      elapsed->elapsed_10ms = 0;
+      client_state->elapsed_pos =
+	(char *) &elapsed->elapsed_10ms -
+	(char *) vlib_buffer_get_current (b);
+      d += sizeof (*elapsed);
+
+      ia_hdr = (dhcpv6_ia_header_t *) d;
+      ia_hdr->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_IA_PD);
+      ia_hdr->iaid = clib_host_to_net_u32 (DHCPV6_CLIENT_IAID);
+      ia_hdr->t1 = clib_host_to_net_u32 (client_state->params.T1);
+      ia_hdr->t2 = clib_host_to_net_u32 (client_state->params.T2);
+      d += sizeof (*ia_hdr);
+
+      n_prefixes = vec_len (client_state->params.prefixes);
+
+      ia_hdr->opt.length =
+	clib_host_to_net_u16 (sizeof (*ia_hdr) +
+			      n_prefixes * sizeof (*opt_pd) -
+			      sizeof (ia_hdr->opt));
+
+      for (i = 0; i < n_prefixes; i++)
+	{
+	  dhcp6_pd_send_client_message_params_prefix_t *pref =
+	    &client_state->params.prefixes[i];
+	  opt_pd = (dhcpv6_ia_opt_pd_t *) d;
+	  opt_pd->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_IAPREFIX);
+	  opt_pd->opt.length =
+	    clib_host_to_net_u16 (sizeof (*opt_pd) - sizeof (opt_pd->opt));
+	  opt_pd->addr = pref->prefix;
+	  opt_pd->prefix = pref->prefix_length;
+	  opt_pd->valid = clib_host_to_net_u32 (pref->valid_lt);
+	  opt_pd->preferred = clib_host_to_net_u32 (pref->preferred_lt);
+	  d += sizeof (*opt_pd);
+	}
+    }
+  else
+    {
+      clib_warning ("State not implemented");
+    }
+
+  dhcp_opt_len = ((u8 *) d) - dhcp->data;
+  udp->length =
+    clib_host_to_net_u16 (sizeof (*udp) + sizeof (*dhcp) + dhcp_opt_len);
+  ip->payload_length = udp->length;
+  b->current_length =
+    sizeof (*ip) + sizeof (*udp) + sizeof (*dhcp) + dhcp_opt_len;
+
+  ip->dst_address = all_dhcp6_relay_agents_and_servers;
+
+  return b;
+}
+
+static inline u8
+check_pd_send_client_message (vlib_main_t * vm,
+			      dhcp6_pd_client_state_t * client_state,
+			      f64 current_time, f64 * due_time)
+{
+  vlib_buffer_t *p0;
+  vlib_frame_t *f;
+  u32 *to_next;
+  u32 next_index;
+  vlib_buffer_t *c0;
+  ip6_header_t *ip;
+  udp_header_t *udp;
+  u32 ci0;
+  int bogus_length = 0;
+
+  dhcp6_pd_send_client_message_params_t *params;
+
+  f64 now = vlib_time_now (vm);
+
+  if (!client_state->keep_sending_client_message)
+    return false;
+
+  params = &client_state->params;
+
+  if (client_state->due_time > current_time)
+    {
+      *due_time = client_state->due_time;
+      return true;
+    }
+
+  p0 = client_state->buffer;
+
+  next_index = ip6_rewrite_mcast_node.index;
+
+  c0 = vlib_buffer_copy (vm, p0);
+  ci0 = vlib_get_buffer_index (vm, c0);
+
+  ip = (ip6_header_t *) vlib_buffer_get_current (c0);
+  udp = (udp_header_t *) (ip + 1);
+
+  u16 *elapsed_field = (u16 *) ((void *) ip + client_state->elapsed_pos);
+  *elapsed_field =
+    clib_host_to_net_u16 ((u16)
+			  ((now - client_state->transaction_start) * 100));
+
+  udp->checksum = 0;
+  udp->checksum =
+    ip6_tcp_udp_icmp_compute_checksum (vm, 0, ip, &bogus_length);
+
+  f = vlib_get_frame_to_node (vm, next_index);
+  to_next = vlib_frame_vector_args (f);
+  to_next[0] = ci0;
+  f->n_vectors = 1;
+  vlib_put_frame_to_node (vm, next_index, f);
+
+  if (params->mrc != 0 && --client_state->n_left == 0)
+    stop_sending_client_message (vm, client_state);
+  else
+    {
+      client_state->sleep_interval =
+	(2 + random_f64_from_to (-0.1, 0.1)) * client_state->sleep_interval;
+      if (client_state->sleep_interval > params->mrt)
+	client_state->sleep_interval =
+	  (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
+
+      client_state->due_time = current_time + client_state->sleep_interval;
+
+      if (params->mrd != 0
+	  && current_time > client_state->start_time + params->mrd)
+	stop_sending_client_message (vm, client_state);
+      else
+	*due_time = client_state->due_time;
+    }
+
+  return client_state->keep_sending_client_message;
+}
+
+static uword
+send_dhcp6_pd_client_message_process (vlib_main_t * vm,
+				      vlib_node_runtime_t * rt,
+				      vlib_frame_t * f0)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  dhcp6_pd_client_state_t *client_state;
+  uword *event_data = 0;
+  f64 sleep_time = 1e9;
+  f64 current_time;
+  f64 due_time;
+  f64 dt = 0;
+  int i;
+
+  while (true)
+    {
+      vlib_process_wait_for_event_or_clock (vm, sleep_time);
+      vlib_process_get_events (vm, &event_data);
+      vec_reset_length (event_data);
+
+      current_time = vlib_time_now (vm);
+      do
+	{
+	  due_time = current_time + 1e9;
+	  for (i = 0; i < vec_len (cm->client_state_by_sw_if_index); i++)
+	    {
+	      client_state = &cm->client_state_by_sw_if_index[i];
+	      if (!client_state->entry_valid)
+		continue;
+	      if (check_pd_send_client_message
+		  (vm, client_state, current_time, &dt) && (dt < due_time))
+		due_time = dt;
+	    }
+	  current_time = vlib_time_now (vm);
+	}
+      while (due_time < current_time);
+
+      sleep_time = due_time - current_time;
+    }
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (send_dhcp6_pd_client_message_process_node, static) = {
+    .function = send_dhcp6_pd_client_message_process,
+    .type = VLIB_NODE_TYPE_PROCESS,
+    .name = "send-dhcp6-pd-client-message-process",
+};
+/* *INDENT-ON* */
+
+void
+dhcp6_pd_send_client_message (vlib_main_t * vm, u32 sw_if_index, u8 stop,
+			      dhcp6_pd_send_client_message_params_t * params)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  dhcp6_pd_client_state_t *client_state = 0;
+  dhcp6_pd_client_state_t empty_state = {
+    0,
+  };
+
+  ASSERT (~0 != sw_if_index);
+
+  vec_validate_init_empty (cm->client_state_by_sw_if_index, sw_if_index,
+			   empty_state);
+  client_state = &cm->client_state_by_sw_if_index[sw_if_index];
+  if (!client_state->entry_valid)
+    {
+      client_state->entry_valid = 1;
+      client_state->adj_index = ~0;
+    }
+
+  stop_sending_client_message (vm, client_state);
+
+  if (!stop)
+    {
+      client_state->keep_sending_client_message = 1;
+      vec_free (client_state->params.prefixes);
+      client_state->params = *params;
+      client_state->params.prefixes = vec_dup (params->prefixes);
+      client_state->n_left = params->mrc;
+      client_state->start_time = vlib_time_now (vm);
+      client_state->sleep_interval =
+	(1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
+      client_state->due_time = 0;	/* send first packet ASAP */
+      client_state->transaction_id = random_u32 (&cm->seed) & 0x00ffffff;
+      client_state->buffer =
+	create_buffer_for_client_message (vm, sw_if_index, client_state,
+					  params->msg_type);
+      if (!client_state->buffer)
+	client_state->keep_sending_client_message = 0;
+      else
+	vlib_process_signal_event (vm,
+				   send_dhcp6_pd_client_message_process_node.index,
+				   1, 0);
+    }
+}
+
+static clib_error_t *
+dhcp6_pd_client_init (vlib_main_t * vm)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+
+  cm->vlib_main = vm;
+  cm->vnet_main = vnet_get_main ();
+  cm->publisher_node = ~0;
+  cm->seed = (u32) clib_cpu_time_now ();
+
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (dhcp6_pd_client_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */