Add support for iOAM (sub-TLV) over NSH-MD2. iOAM trace

records are carried as MD2 TLV data.

Change-Id: Id6fe6c961aa3879df5ae476f13b0e39bcc6c0dfe
Signed-off-by: Vengada <venggovi@cisco.com>

1 files changed, 513 insertions, 0 deletions

diff --git a/nsh-plugin/nsh-md2-ioam/nsh_md2_ioam.c b/nsh-plugin/nsh-md2-ioam/nsh_md2_ioam.c
new file mode 100644
index 0000000..8f96759
--- /dev/null
+++ b/nsh-plugin/nsh-md2-ioam/nsh_md2_ioam.c
@@ -0,0 +1,513 @@
+/*
+ * nsh_md2_ioam.c - NSH iOAM functions for MD type 2
+ *
+ * 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.
+ */
+
+#include <vnet/vnet.h>
+#include <vnet/plugin/plugin.h>
+#include <nsh/nsh.h>
+#include <nsh/nsh_packet.h>
+#include <vnet/ip/ip.h>
+#include <nsh-md2-ioam/nsh_md2_ioam.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vlibsocket/api.h>
+
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/fib/fib_entry.h>
+
+/* define message IDs */
+#include <vpp-api/nsh_msg_enum.h>
+
+/* define message structures */
+#define vl_typedefs
+#include <vpp-api/nsh_all_api_h.h>
+#undef vl_typedefs
+
+/* define generated endian-swappers */
+#define vl_endianfun
+#include <vpp-api/nsh_all_api_h.h>
+#undef vl_endianfun
+
+nsh_md2_ioam_main_t nsh_md2_ioam_main;
+
+static void
+nsh_md2_ioam_set_clear_output_feature_on_intf (vlib_main_t * vm,
+						    u32 sw_if_index0,
+						    u8 is_add)
+{
+
+
+
+  vnet_feature_enable_disable ("ip4-output",
+			       "nsh-md2-ioam-encap-transit",
+			       sw_if_index0, is_add,
+			       0 /* void *feature_config */ ,
+			       0 /* u32 n_feature_config_bytes */ );
+  return;
+}
+
+void
+nsh_md2_ioam_clear_output_feature_on_all_intfs (vlib_main_t * vm)
+{
+  vnet_sw_interface_t *si = 0;
+  vnet_main_t *vnm = vnet_get_main ();
+  vnet_interface_main_t *im = &vnm->interface_main;
+
+  pool_foreach (si, im->sw_interfaces, (
+					 {
+					 nsh_md2_ioam_set_clear_output_feature_on_intf
+					 (vm, si->sw_if_index, 0);
+					 }));
+  return;
+}
+
+
+extern fib_forward_chain_type_t
+fib_entry_get_default_chain_type (const fib_entry_t * fib_entry);
+
+int
+nsh_md2_ioam_enable_disable_for_dest (vlib_main_t * vm,
+					   ip46_address_t dst_addr,
+					   u32 outer_fib_index,
+					   u8 is_ipv4, u8 is_add)
+{
+  nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
+  u32 fib_index0 = 0;
+
+  fib_node_index_t fei = ~0;
+  u32 *sw_if_index0 = NULL;
+#if 0
+  fib_entry_t *fib_entry;
+  u32 adj_index0;
+  ip_adjacency_t *adj0;
+  load_balance_t *lb_m, *lb_b;
+  const dpo_id_t *dpo0, *dpo1;
+  u32 i, j, k;
+#endif
+  u32 *intf_list = NULL;
+  fib_prefix_t fib_prefix;
+
+  if (is_ipv4)
+    {
+      memset (&fib_prefix, 0, sizeof (fib_prefix_t));
+      fib_prefix.fp_len = 32;
+      fib_prefix.fp_proto = FIB_PROTOCOL_IP4;
+#define  TRANSIT_UNIT_TEST_HACK 1
+#ifdef TRANSIT_UNIT_TEST_HACK
+      memset(&dst_addr, 0, sizeof(dst_addr));
+      dst_addr.ip4.as_u32 = clib_net_to_host_u32(0x14020102);
+#endif
+      fib_prefix.fp_addr = dst_addr;
+    }
+  else
+    {
+      return 0;
+    }
+
+  fei = fib_table_lookup (fib_index0, &fib_prefix);
+#if 0
+  fib_entry = fib_entry_get (fei);
+
+
+  if (!dpo_id_is_valid (&fib_entry->fe_lb))
+    {
+      return (-1);
+    }
+
+  lb_m = load_balance_get (fib_entry->fe_lb.dpoi_index);
+
+  for (i = 0; i < lb_m->lb_n_buckets; i++)
+    {
+      dpo0 = load_balance_get_bucket_i (lb_m, i);
+
+      if (dpo0->dpoi_type == DPO_LOAD_BALANCE ||
+	  dpo0->dpoi_type == DPO_ADJACENCY)
+	{
+	  if (dpo0->dpoi_type == DPO_ADJACENCY)
+	    {
+	      k = 1;
+	    }
+	  else
+	    {
+	      lb_b = load_balance_get (dpo0->dpoi_index);
+	      k = lb_b->lb_n_buckets;
+	    }
+
+	  for (j = 0; j < k; j++)
+	    {
+	      if (dpo0->dpoi_type == DPO_ADJACENCY)
+		{
+		  dpo1 = dpo0;
+		}
+	      else
+		{
+		  dpo1 = load_balance_get_bucket_i (lb_b, j);
+		}
+
+	      if (dpo1->dpoi_type == DPO_ADJACENCY)
+		{
+		  adj_index0 = dpo1->dpoi_index;
+
+		  if (ADJ_INDEX_INVALID == adj_index0)
+		    {
+		      continue;
+		    }
+
+		  adj0 =
+		    ip_get_adjacency (&(ip4_main.lookup_main), adj_index0);
+		  sw_if_index0 = adj0->rewrite_header.sw_if_index;
+
+		  if (~0 == sw_if_index0)
+		    {
+		      continue;
+		    }
+
+
+		  if (is_add)
+		    {
+		      vnet_feature_enable_disable ("ip4-output",
+						   "nsh-md2-ioam-encap-transit",
+						   sw_if_index0, is_add, 0,
+						   /* void *feature_config */
+						   0	/* u32 n_feature_config_bytes */
+			);
+
+		      vec_validate_init_empty (hm->bool_ref_by_sw_if_index,
+					       sw_if_index0, ~0);
+		      hm->bool_ref_by_sw_if_index[sw_if_index0] = 1;
+		    }
+		  else
+		    {
+		      hm->bool_ref_by_sw_if_index[sw_if_index0] = ~0;
+		    }
+		}
+	    }
+	}
+    }
+#else
+
+u32 fib_path_get_resolving_interface (fib_node_index_t path_index);
+    vec_add1(intf_list, fib_path_get_resolving_interface(fei));
+    vec_foreach(sw_if_index0, intf_list)
+    if (is_add)
+      {
+        vnet_feature_enable_disable ("ip4-output",
+                         "nsh-md2-ioam-encap-transit",
+                         *sw_if_index0, is_add, 0,
+                         /* void *feature_config */
+                         0    /* u32 n_feature_config_bytes */
+          );
+
+        vec_validate_init_empty (hm->bool_ref_by_sw_if_index,
+                         *sw_if_index0, ~0);
+        hm->bool_ref_by_sw_if_index[*sw_if_index0] = 1;
+      }
+    else
+      {
+        hm->bool_ref_by_sw_if_index[*sw_if_index0] = ~0;
+      }
+
+#endif
+
+  if (is_ipv4)
+    {
+      uword *t = NULL;
+      nsh_md2_ioam_dest_tunnels_t *t1;
+      fib_prefix_t key4, *key4_copy;
+      hash_pair_t *hp;
+      memset (&key4, 0, sizeof (key4));
+      key4.fp_proto = FIB_PROTOCOL_IP4;
+      key4.fp_addr.ip4.as_u32 = fib_prefix.fp_addr.ip4.as_u32;
+      t = hash_get_mem (hm->dst_by_ip4, &key4);
+      if (is_add)
+	{
+	  if (t)
+	    {
+	      return 0;
+	    }
+	  pool_get_aligned (hm->dst_tunnels, t1, CLIB_CACHE_LINE_BYTES);
+	  memset (t1, 0, sizeof (*t1));
+	  t1->fp_proto = FIB_PROTOCOL_IP4;
+	  t1->dst_addr.ip4.as_u32 = fib_prefix.fp_addr.ip4.as_u32;
+	  key4_copy = clib_mem_alloc (sizeof (*key4_copy));
+          memset(key4_copy, 0, sizeof(*key4_copy));
+	  clib_memcpy (key4_copy, &key4, sizeof (*key4_copy));
+	  hash_set_mem (hm->dst_by_ip4, key4_copy, t1 - hm->dst_tunnels);
+	  /*
+	   * Attach to the FIB entry for the VxLAN-GPE destination
+	   * and become its child. The dest route will invoke a callback
+	   * when the fib entry changes, it can be used to
+	   * re-program the output feature on the egress interface.
+	   */
+
+	  const fib_prefix_t tun_dst_pfx = {
+	    .fp_len = 32,
+	    .fp_proto = FIB_PROTOCOL_IP4,
+	    .fp_addr = {.ip4 = t1->dst_addr.ip4,}
+	  };
+
+	  t1->fib_entry_index =
+	    fib_table_entry_special_add (outer_fib_index,
+					 &tun_dst_pfx,
+					 FIB_SOURCE_RR,
+					 FIB_ENTRY_FLAG_NONE,
+					 ADJ_INDEX_INVALID);
+	  t1->sibling_index =
+	    fib_entry_child_add (t1->fib_entry_index,
+				 hm->fib_entry_type, t1 - hm->dst_tunnels);
+	  t1->outer_fib_index = outer_fib_index;
+
+	}
+      else
+	{
+	  if (!t)
+	    {
+	      return 0;
+	    }
+	  t1 = pool_elt_at_index (hm->dst_tunnels, t[0]);
+	  hp = hash_get_pair (hm->dst_by_ip4, &key4);
+	  key4_copy = (void *) (hp->key);
+	  hash_unset_mem (hm->dst_by_ip4, &key4);
+	  clib_mem_free (key4_copy);
+	  pool_put (hm->dst_tunnels, t1);
+	}
+    }
+  else
+    {
+      // TBD for IPv6
+    }
+
+  return 0;
+}
+
+void
+nsh_md2_ioam_refresh_output_feature_on_all_dest (void)
+{
+  nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
+  nsh_main_t *gm = &nsh_main;
+  nsh_md2_ioam_dest_tunnels_t *t;
+  u32 i;
+
+  if (pool_elts (hm->dst_tunnels) == 0)
+    return;
+
+  nsh_md2_ioam_clear_output_feature_on_all_intfs (gm->vlib_main);
+  i = vec_len (hm->bool_ref_by_sw_if_index);
+  vec_free (hm->bool_ref_by_sw_if_index);
+  vec_validate_init_empty (hm->bool_ref_by_sw_if_index, i, ~0);
+  pool_foreach (t, hm->dst_tunnels, (
+				      {
+				      nsh_md2_ioam_enable_disable_for_dest
+				      (gm->vlib_main,
+				       t->dst_addr,
+				       t->outer_fib_index,
+				       (t->fp_proto == FIB_PROTOCOL_IP4), 1
+				       /* is_add */
+				      );
+				      }
+		));
+  return;
+}
+
+void
+nsh_md2_ioam_clear_output_feature_on_select_intfs (void)
+{
+  nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
+  nsh_main_t *gm = &nsh_main;
+
+  u32 sw_if_index0 = 0;
+  for (sw_if_index0 = 0;
+       sw_if_index0 < vec_len (hm->bool_ref_by_sw_if_index); sw_if_index0++)
+    {
+      if (hm->bool_ref_by_sw_if_index[sw_if_index0] == 0xFF)
+	{
+	  nsh_md2_ioam_set_clear_output_feature_on_intf
+	    (gm->vlib_main, sw_if_index0, 0);
+	}
+    }
+
+  return;
+}
+
+
+
+
+clib_error_t *
+nsh_md2_ioam_enable_disable (int has_trace_option, int has_pot_option,
+				  int has_ppc_option)
+{
+  nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
+
+  hm->has_trace_option = has_trace_option;
+  hm->has_pot_option = has_pot_option;
+  hm->has_ppc_option = has_ppc_option;
+
+  if (hm->has_trace_option)
+    {
+      nsh_md2_ioam_trace_profile_setup ();
+    }
+  else if (!hm->has_trace_option)
+    {
+      nsh_md2_ioam_trace_profile_cleanup ();
+    }
+
+  return 0;
+}
+
+
+int nsh_md2_ioam_disable_for_dest
+  (vlib_main_t * vm, ip46_address_t dst_addr, u32 outer_fib_index,
+   u8 ipv4_set)
+{
+  nsh_md2_ioam_dest_tunnels_t *t;
+  nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
+  nsh_main_t *gm = &nsh_main;
+
+  nsh_md2_ioam_enable_disable_for_dest (gm->vlib_main,
+					     dst_addr, outer_fib_index,
+					     ipv4_set, 0);
+  if (pool_elts (hm->dst_tunnels) == 0)
+    {
+      nsh_md2_ioam_clear_output_feature_on_select_intfs ();
+      return 0;
+    }
+
+  pool_foreach (t, hm->dst_tunnels, (
+				      {
+				      nsh_md2_ioam_enable_disable_for_dest
+				      (gm->vlib_main,
+				       t->dst_addr,
+				       t->outer_fib_index,
+				       (t->fp_proto ==
+					FIB_PROTOCOL_IP4), 1 /* is_add */ );
+				      }
+		));
+  nsh_md2_ioam_clear_output_feature_on_select_intfs ();
+  return (0);
+
+}
+
+static clib_error_t *nsh_md2_ioam_set_transit_rewrite_command_fn
+  (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  nsh_main_t *gm = &nsh_main;
+  ip46_address_t dst_addr;
+  u8 dst_addr_set = 0;
+  u8 ipv4_set = 0;
+  u8 ipv6_set = 0;
+  u8 disable = 0;
+  clib_error_t *rv = 0;
+  u32 outer_fib_index = 0;
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "dst-ip %U", unformat_ip4_address, &dst_addr.ip4))
+	{
+	  dst_addr_set = 1;
+	  ipv4_set = 1;
+	}
+      else
+	if (unformat
+	    (input, "dst-ip %U", unformat_ip6_address, &dst_addr.ip6))
+	{
+	  dst_addr_set = 1;
+	  ipv6_set = 1;
+	}
+      else if (unformat (input, "outer-fib-index %d", &outer_fib_index))
+	{
+	}
+
+      else if (unformat (input, "disable"))
+	disable = 1;
+      else
+	break;
+    }
+
+  if (dst_addr_set == 0)
+    return clib_error_return (0,
+			      "LISP-GPE Tunnel destination address not specified");
+  if (ipv4_set && ipv6_set)
+    return clib_error_return (0, "both IPv4 and IPv6 addresses specified");
+  if (!disable)
+    {
+      nsh_md2_ioam_enable_disable_for_dest (gm->vlib_main,
+						 dst_addr, outer_fib_index,
+						 ipv4_set, 1);
+    }
+  else
+    {
+      nsh_md2_ioam_disable_for_dest
+	(vm, dst_addr, outer_fib_index, ipv4_set);
+    }
+  return rv;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (nsh_md2_ioam_set_transit_rewrite_cmd, static) = {
+  .path = "set nsh-md2-ioam-transit",
+  .short_help = "set nsh-ioam-lisp-gpe-transit dst-ip <dst_ip> [outer-fib-index <outer_fib_index>] [disable]",
+  .function = nsh_md2_ioam_set_transit_rewrite_command_fn,
+};
+
+/**
+ * Function definition to backwalk a FIB node
+ */
+static fib_node_back_walk_rc_t
+nsh_md2_ioam_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
+{
+  nsh_md2_ioam_refresh_output_feature_on_all_dest ();
+  return (FIB_NODE_BACK_WALK_CONTINUE);
+}
+
+/**
+ * Function definition to get a FIB node from its index
+ */
+static fib_node_t *
+nsh_md2_ioam_fib_node_get (fib_node_index_t index)
+{
+  nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
+  return (&hm->node);
+}
+
+/**
+ * Function definition to inform the FIB node that its last lock has gone.
+ */
+static void
+nsh_md2_ioam_last_lock_gone (fib_node_t * node)
+{
+  ASSERT (0);
+}
+
+
+/*
+ * Virtual function table registered by MPLS GRE tunnels
+ * for participation in the FIB object graph.
+ */
+const static fib_node_vft_t nsh_md2_ioam_vft = {
+  .fnv_get = nsh_md2_ioam_fib_node_get,
+  .fnv_last_lock = nsh_md2_ioam_last_lock_gone,
+  .fnv_back_walk = nsh_md2_ioam_back_walk,
+};
+
+void
+nsh_md2_ioam_interface_init (void)
+{
+  nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
+  hm->fib_entry_type = fib_node_register_new_type (&nsh_md2_ioam_vft);
+  return;
+}
+