GBP Endpoint Learning

Learning GBP endpoints over vxlan-gbp tunnels

Change-Id: I1db9fda5a16802d9ad8b4efd4e475614f3b21502
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

1 files changed, 413 insertions, 0 deletions

diff --git a/src/plugins/gbp/gbp_route_domain.c b/src/plugins/gbp/gbp_route_domain.c
new file mode 100644
index 00000000000..5518cc1ca36
--- /dev/null
+++ b/src/plugins/gbp/gbp_route_domain.c
@@ -0,0 +1,413 @@
+/*
+ * 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 <plugins/gbp/gbp_route_domain.h>
+#include <plugins/gbp/gbp_endpoint.h>
+
+#include <vnet/dpo/dvr_dpo.h>
+#include <vnet/fib/fib_table.h>
+#include <vnet/ip/ip_neighbor.h>
+
+/**
+ * A fixed MAC address to use as the source MAC for packets L3 switched
+ * onto the routed uu-fwd interfaces.
+ * Magic values - origin lost to the mists of time...
+ */
+/* *INDENT-OFF* */
+const static mac_address_t GBP_ROUTED_SRC_MAC = {
+  .bytes = {
+    0x0, 0x22, 0xBD, 0xF8, 0x19, 0xFF,
+  }
+};
+
+const static mac_address_t GBP_ROUTED_DST_MAC = {
+  .bytes = {
+    00, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
+  }
+};
+/* *INDENT-ON* */
+
+/**
+ * Pool of GBP route_domains
+ */
+gbp_route_domain_t *gbp_route_domain_pool;
+
+/**
+ * DB of route_domains
+ */
+typedef struct gbp_route_domain_db_t
+{
+  uword *gbd_by_rd_id;
+} gbp_route_domain_db_t;
+
+static gbp_route_domain_db_t gbp_route_domain_db;
+
+/**
+ * logger
+ */
+vlib_log_class_t grd_logger;
+
+#define GBP_BD_DBG(...)                           \
+    vlib_log_debug (grd_logger, __VA_ARGS__);
+
+gbp_route_domain_t *
+gbp_route_domain_get (index_t i)
+{
+  return (pool_elt_at_index (gbp_route_domain_pool, i));
+}
+
+static void
+gbp_route_domain_lock (index_t i)
+{
+  gbp_route_domain_t *grd;
+
+  grd = gbp_route_domain_get (i);
+  grd->grd_locks++;
+}
+
+index_t
+gbp_route_domain_find (u32 rd_id)
+{
+  uword *p;
+
+  p = hash_get (gbp_route_domain_db.gbd_by_rd_id, rd_id);
+
+  if (NULL != p)
+    return p[0];
+
+  return (INDEX_INVALID);
+}
+
+index_t
+gbp_route_domain_find_and_lock (u32 rd_id)
+{
+  index_t grdi;
+
+  grdi = gbp_route_domain_find (rd_id);
+
+  if (INDEX_INVALID != grdi)
+    {
+      gbp_route_domain_lock (grdi);
+    }
+  return (grdi);
+}
+
+static void
+gbp_route_domain_db_add (gbp_route_domain_t * grd)
+{
+  index_t grdi = grd - gbp_route_domain_pool;
+
+  hash_set (gbp_route_domain_db.gbd_by_rd_id, grd->grd_id, grdi);
+}
+
+static void
+gbp_route_domain_db_remove (gbp_route_domain_t * grd)
+{
+  hash_unset (gbp_route_domain_db.gbd_by_rd_id, grd->grd_id);
+}
+
+int
+gbp_route_domain_add_and_lock (u32 rd_id,
+			       u32 ip4_table_id,
+			       u32 ip6_table_id,
+			       u32 ip4_uu_sw_if_index, u32 ip6_uu_sw_if_index)
+{
+  gbp_route_domain_t *grd;
+  index_t grdi;
+
+  grdi = gbp_route_domain_find (rd_id);
+
+  if (INDEX_INVALID == grdi)
+    {
+      fib_protocol_t fproto;
+
+      pool_get_zero (gbp_route_domain_pool, grd);
+
+      grd->grd_id = rd_id;
+      grd->grd_table_id[FIB_PROTOCOL_IP4] = ip4_table_id;
+      grd->grd_table_id[FIB_PROTOCOL_IP6] = ip6_table_id;
+      grd->grd_uu_sw_if_index[FIB_PROTOCOL_IP4] = ip4_uu_sw_if_index;
+      grd->grd_uu_sw_if_index[FIB_PROTOCOL_IP6] = ip6_uu_sw_if_index;
+
+      FOR_EACH_FIB_IP_PROTOCOL (fproto)
+      {
+	grd->grd_fib_index[fproto] =
+	  fib_table_find_or_create_and_lock (fproto,
+					     grd->grd_table_id[fproto],
+					     FIB_SOURCE_PLUGIN_HI);
+
+	if (~0 != grd->grd_uu_sw_if_index[fproto])
+	  {
+	    ethernet_header_t *eth;
+	    u8 *rewrite;
+
+	    rewrite = NULL;
+	    vec_validate (rewrite, sizeof (*eth) - 1);
+	    eth = (ethernet_header_t *) rewrite;
+
+	    eth->type = clib_host_to_net_u16 ((fproto == FIB_PROTOCOL_IP4 ?
+					       ETHERNET_TYPE_IP4 :
+					       ETHERNET_TYPE_IP6));
+
+	    mac_address_to_bytes (gbp_route_domain_get_local_mac (),
+				  eth->src_address);
+	    mac_address_to_bytes (gbp_route_domain_get_remote_mac (),
+				  eth->src_address);
+
+	    /*
+	     * create an adjacency out of the uu-fwd interfaces that will
+	     * be used when adding subnet routes.
+	     */
+	    grd->grd_adj[fproto] =
+	      adj_nbr_add_or_lock_w_rewrite (fproto,
+					     fib_proto_to_link (fproto),
+					     &ADJ_BCAST_ADDR,
+					     grd->grd_uu_sw_if_index[fproto],
+					     rewrite);
+	  }
+	else
+	  {
+	    grd->grd_adj[fproto] = INDEX_INVALID;
+	  }
+      }
+
+      gbp_route_domain_db_add (grd);
+    }
+  else
+    {
+      grd = gbp_route_domain_get (grdi);
+    }
+
+  grd->grd_locks++;
+  GBP_BD_DBG ("add: %U", format_gbp_route_domain, grd);
+
+  return (0);
+}
+
+void
+gbp_route_domain_unlock (index_t index)
+{
+  gbp_route_domain_t *grd;
+
+  grd = gbp_route_domain_get (index);
+
+  grd->grd_locks--;
+
+  if (0 == grd->grd_locks)
+    {
+      fib_protocol_t fproto;
+
+      GBP_BD_DBG ("destroy: %U", format_gbp_route_domain, grd);
+
+      FOR_EACH_FIB_IP_PROTOCOL (fproto)
+      {
+	fib_table_unlock (grd->grd_fib_index[fproto],
+			  fproto, FIB_SOURCE_PLUGIN_HI);
+	if (INDEX_INVALID != grd->grd_adj[fproto])
+	  adj_unlock (grd->grd_adj[fproto]);
+      }
+
+      gbp_route_domain_db_remove (grd);
+
+      pool_put (gbp_route_domain_pool, grd);
+    }
+}
+
+int
+gbp_route_domain_delete (u32 rd_id)
+{
+  index_t grdi;
+
+  GBP_BD_DBG ("del: %d", rd_id);
+  grdi = gbp_route_domain_find (rd_id);
+
+  if (INDEX_INVALID != grdi)
+    {
+      GBP_BD_DBG ("del: %U", format_gbp_route_domain,
+		  gbp_route_domain_get (grdi));
+      gbp_route_domain_unlock (grdi);
+
+      return (0);
+    }
+
+  return (VNET_API_ERROR_NO_SUCH_ENTRY);
+}
+
+const mac_address_t *
+gbp_route_domain_get_local_mac (void)
+{
+  return (&GBP_ROUTED_SRC_MAC);
+}
+
+const mac_address_t *
+gbp_route_domain_get_remote_mac (void)
+{
+  return (&GBP_ROUTED_DST_MAC);
+}
+
+void
+gbp_route_domain_walk (gbp_route_domain_cb_t cb, void *ctx)
+{
+  gbp_route_domain_t *gbpe;
+
+  /* *INDENT-OFF* */
+  pool_foreach(gbpe, gbp_route_domain_pool,
+  {
+    if (!cb(gbpe, ctx))
+      break;
+  });
+  /* *INDENT-ON* */
+}
+
+static clib_error_t *
+gbp_route_domain_cli (vlib_main_t * vm,
+		      unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  u32 ip4_uu_sw_if_index = ~0;
+  u32 ip6_uu_sw_if_index = ~0;
+  u32 ip4_table_id = ~0;
+  u32 ip6_table_id = ~0;
+  u32 rd_id = ~0;
+  u8 add = 1;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "ip4-uu %U", unformat_vnet_sw_interface,
+		    vnm, &ip4_uu_sw_if_index))
+	;
+      else if (unformat (input, "ip6-uu %U", unformat_vnet_sw_interface,
+			 vnm, &ip6_uu_sw_if_index))
+	;
+      else if (unformat (input, "ip4-table-id %d", ip4_table_id))
+	;
+      else if (unformat (input, "ip6-table-id %d", ip6_table_id))
+	;
+      else if (unformat (input, "add"))
+	add = 1;
+      else if (unformat (input, "del"))
+	add = 0;
+      else if (unformat (input, "rd %d", &rd_id))
+	;
+      else
+	break;
+    }
+
+  if (~0 == rd_id)
+    return clib_error_return (0, "RD-ID must be specified");
+
+  if (add)
+    {
+      if (~0 == ip4_table_id)
+	return clib_error_return (0, "IP4 table-ID must be specified");
+      if (~0 == ip6_table_id)
+	return clib_error_return (0, "IP6 table-ID must be specified");
+
+      gbp_route_domain_add_and_lock (rd_id, ip4_table_id,
+				     ip6_table_id,
+				     ip4_uu_sw_if_index, ip6_uu_sw_if_index);
+    }
+  else
+    gbp_route_domain_delete (rd_id);
+
+  return (NULL);
+}
+
+/*?
+ * Configure a GBP route-domain
+ *
+ * @cliexpar
+ * @cliexstart{set gbp route-domain [del] bd <ID> bvi <interface> uu-flood <interface>}
+ * @cliexend
+ ?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (gbp_route_domain_cli_node, static) = {
+  .path = "gbp route-domain",
+  .short_help = "gbp route-domain [del] epg bd <ID> bvi <interface> uu-flood <interface>",
+  .function = gbp_route_domain_cli,
+};
+
+u8 *
+format_gbp_route_domain (u8 * s, va_list * args)
+{
+  gbp_route_domain_t *grd = va_arg (*args, gbp_route_domain_t*);
+  vnet_main_t *vnm = vnet_get_main ();
+
+  if (NULL != grd)
+    s = format (s, "[%d] rd:%d ip4-uu:%U ip6-uu:%U locks:%d",
+                grd - gbp_route_domain_pool,
+                grd->grd_id,
+                format_vnet_sw_if_index_name, vnm, grd->grd_uu_sw_if_index[FIB_PROTOCOL_IP4],
+                format_vnet_sw_if_index_name, vnm, grd->grd_uu_sw_if_index[FIB_PROTOCOL_IP6],
+                grd->grd_locks);
+  else
+    s = format (s, "NULL");
+
+  return (s);
+}
+
+static int
+gbp_route_domain_show_one (gbp_route_domain_t *gb, void *ctx)
+{
+  vlib_main_t *vm;
+
+  vm = ctx;
+  vlib_cli_output (vm, "  %U",format_gbp_route_domain, gb);
+
+  return (1);
+}
+
+static clib_error_t *
+gbp_route_domain_show (vlib_main_t * vm,
+		   unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  vlib_cli_output (vm, "Route-Domains:");
+  gbp_route_domain_walk (gbp_route_domain_show_one, vm);
+
+  return (NULL);
+}
+
+/*?
+ * Show Group Based Policy Route_Domains and derived information
+ *
+ * @cliexpar
+ * @cliexstart{show gbp route_domain}
+ * @cliexend
+ ?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (gbp_route_domain_show_node, static) = {
+  .path = "show gbp route-domain",
+  .short_help = "show gbp route-domain\n",
+  .function = gbp_route_domain_show,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+gbp_route_domain_init (vlib_main_t * vm)
+{
+  grd_logger = vlib_log_register_class ("gbp", "rd");
+
+  return (NULL);
+}
+
+VLIB_INIT_FUNCTION (gbp_route_domain_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */