sr: move srmpls to a plugin

Move sr_mpls folder under vnet to the plugin folder, update cmake configuration
and header paths, and add plugin.c to register plugin.

JIRA: VPP-2054

Type: improvement
Change-Id: I1ad6f287f67eb0c35588c339bcd51218fadf5f8e
Signed-off-by: Scott Hutton <schutton@cisco.com>

1 files changed, 903 insertions, 0 deletions

diff --git a/src/plugins/srmpls/sr_mpls_policy.c b/src/plugins/srmpls/sr_mpls_policy.c
new file mode 100644
index 00000000000..af24acd8cf6
--- /dev/null
+++ b/src/plugins/srmpls/sr_mpls_policy.c
@@ -0,0 +1,903 @@
+/*
+ * sr_mpls_policy.c: SR-MPLS policies
+ *
+ * Copyright (c) 2016 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.
+ */
+
+/**
+ * @file
+ * @brief SR MPLS policy creation and application
+ *
+ * Create an SR policy.
+ * An SR policy can be either of 'default' type or 'spray' type
+ * An SR policy has attached a list of SID lists.
+ * In case the SR policy is a default one it will load balance among them.
+ * An SR policy has associated a BindingSID.
+ * In case any packet arrives with MPLS_label == BindingSID then the SR policy
+ * associated to such bindingSID will be applied to such packet.
+ * Also, a BSID can be associated with a (Next-Hop, Color)
+ *
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include "sr_mpls.h"
+#include <vnet/fib/mpls_fib.h>
+#include <vnet/dpo/dpo.h>
+#include <vnet/ip/ip.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+mpls_sr_main_t sr_mpls_main;
+
+/***************************  SR LB helper functions **************************/
+/**
+ * @brief Creates a Segment List and adds it to an SR policy
+ *
+ * Creates a Segment List and adds it to the SR policy. Notice that the SL are
+ * not necessarily unique. Hence there might be two Segment List within the
+ * same SR Policy with exactly the same segments and same weight.
+ *
+ * @param sr_policy is the SR policy where the SL will be added
+ * @param sl is a vector of IPv6 addresses composing the Segment List
+ * @param weight is the weight of the SegmentList (for load-balancing purposes)
+ * @param is_encap represents the mode (SRH insertion vs Encapsulation)
+ *
+ * @return pointer to the just created segment list
+ */
+static inline mpls_sr_sl_t *
+create_sl (mpls_sr_policy_t * sr_policy, mpls_label_t * sl, u32 weight)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+  mpls_sr_sl_t *segment_list;
+  u32 ii;
+
+  pool_get (sm->sid_lists, segment_list);
+  clib_memset (segment_list, 0, sizeof (*segment_list));
+
+  vec_add1 (sr_policy->segments_lists, segment_list - sm->sid_lists);
+
+  /* Fill in segment list */
+  segment_list->weight =
+    (weight != (u32) ~ 0 ? weight : SR_SEGMENT_LIST_WEIGHT_DEFAULT);
+  segment_list->segments = vec_dup (sl);
+
+  mpls_eos_bit_t eos;
+  FOR_EACH_MPLS_EOS_BIT (eos)
+  {
+    fib_route_path_t path = {
+      .frp_proto = DPO_PROTO_MPLS,
+      .frp_sw_if_index = ~0,
+      .frp_fib_index = 0,
+      .frp_weight = segment_list->weight,
+      .frp_flags = FIB_ROUTE_PATH_FLAG_NONE,
+      .frp_label_stack = NULL,
+      .frp_local_label = sl[0],
+    };
+
+    if (vec_len (sl) > 1)
+      {
+	vec_validate (path.frp_label_stack, vec_len (sl) - 2);
+	for (ii = 1; ii < vec_len (sl); ii++)
+	  {
+	    path.frp_label_stack[ii - 1].fml_value = sl[ii];
+	  }
+      }
+    else
+      {
+	/*
+	 * add an impliciet NULL label to allow non-eos recursion
+	 */
+	fib_mpls_label_t lbl = {
+	  .fml_value = MPLS_IETF_IMPLICIT_NULL_LABEL,
+	};
+	vec_add1 (path.frp_label_stack, lbl);
+      }
+
+    fib_route_path_t *paths = NULL;
+    vec_add1 (paths, path);
+
+    fib_prefix_t pfx = {
+        .fp_len = 21,
+        .fp_proto = FIB_PROTOCOL_MPLS,
+        .fp_label = sr_policy->bsid,
+        .fp_eos = eos,
+        .fp_payload_proto = DPO_PROTO_MPLS,
+    };
+
+    fib_table_entry_path_add2 (0,
+			       &pfx,
+			       FIB_SOURCE_SR,
+			       (sr_policy->type == SR_POLICY_TYPE_DEFAULT ?
+				FIB_ENTRY_FLAG_NONE :
+				FIB_ENTRY_FLAG_MULTICAST), paths);
+    vec_free (paths);
+  }
+
+  return segment_list;
+}
+
+/******************************* SR rewrite API *******************************/
+/*
+ * Three functions for handling sr policies: -> sr_mpls_policy_add ->
+ * sr_mpls_policy_del -> sr_mpls_policy_mod All of them are API. CLI function
+ * on sr_policy_command_fn
+ */
+
+/**
+ * @brief Create a new SR policy
+ *
+ * @param bsid is the bindingSID of the SR Policy
+ * @param segments is a vector of MPLS labels composing the segment list
+ * @param behavior is the behavior of the SR policy. (default//spray)
+ * @param fib_table is the VRF where to install the FIB entry for the BSID
+ * @param weight is the weight of this specific SID list
+ *
+ * @return 0 if correct, else error
+ */
+int
+sr_mpls_policy_add (mpls_label_t bsid, mpls_label_t * segments,
+		    u8 behavior, u32 weight)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+  mpls_sr_policy_t *sr_policy = 0;
+  uword *p;
+
+  if (!sm->sr_policies_index_hash)
+    sm->sr_policies_index_hash = hash_create (0, sizeof (mpls_label_t));
+
+  /* MPLS SR policies cannot be created unless the MPLS table is present */
+  if (~0 == fib_table_find (FIB_PROTOCOL_MPLS, MPLS_FIB_DEFAULT_TABLE_ID))
+    return (VNET_API_ERROR_NO_SUCH_TABLE);
+
+  /* Search for existing keys (BSID) */
+  p = hash_get (sm->sr_policies_index_hash, bsid);
+  if (p)
+    {
+      /* Add SR policy that already exists; complain */
+      return -12;
+    }
+  /* Add an SR policy object */
+  pool_get (sm->sr_policies, sr_policy);
+  clib_memset (sr_policy, 0, sizeof (*sr_policy));
+
+  /* the first policy needs to lock the MPLS table so it doesn't
+   * disappear with policies in it */
+  if (1 == pool_elts (sm->sr_policies))
+    fib_table_find_or_create_and_lock (FIB_PROTOCOL_MPLS,
+				       MPLS_FIB_DEFAULT_TABLE_ID,
+				       FIB_SOURCE_SR);
+  sr_policy->bsid = bsid;
+  sr_policy->type = behavior;
+  sr_policy->endpoint_type = 0;
+  ip6_address_set_zero (&sr_policy->endpoint.ip6);
+  sr_policy->color = (u32) ~ 0;
+
+  /* Copy the key */
+  hash_set (sm->sr_policies_index_hash, bsid, sr_policy - sm->sr_policies);
+
+  /* Create a segment list and add the index to the SR policy */
+  create_sl (sr_policy, segments, weight);
+
+  return 0;
+}
+
+/**
+ * @brief Delete a SR policy
+ *
+ * @param bsid is the bindingSID of the SR Policy
+ * @param index is the index of the SR policy
+ *
+ * @return 0 if correct, else error
+ */
+int
+sr_mpls_policy_del (mpls_label_t bsid)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+  mpls_sr_policy_t *sr_policy = 0;
+  mpls_sr_sl_t *segment_list;
+  mpls_eos_bit_t eos;
+  u32 *sl_index;
+  uword *p;
+
+  if (!sm->sr_policies_index_hash)
+    sm->sr_policies_index_hash = hash_create (0, sizeof (mpls_label_t));
+
+  p = hash_get (sm->sr_policies_index_hash, bsid);
+  if (p)
+    sr_policy = pool_elt_at_index (sm->sr_policies, p[0]);
+  else
+    return -1;
+
+  /* Clean SID Lists */
+  vec_foreach (sl_index, sr_policy->segments_lists)
+  {
+    segment_list = pool_elt_at_index (sm->sid_lists, *sl_index);
+
+    fib_route_path_t path = {
+      .frp_proto = DPO_PROTO_MPLS,
+      .frp_sw_if_index = ~0,
+      .frp_fib_index = 0,
+      .frp_weight = segment_list->weight,
+      .frp_flags = FIB_ROUTE_PATH_FLAG_NONE,
+      .frp_local_label = segment_list->segments[0],
+    };
+
+    vec_add (path.frp_label_stack, segment_list + 1,
+	     vec_len (segment_list) - 1);
+
+    fib_route_path_t *paths = NULL;
+    vec_add1 (paths, path);
+
+    /* remove each of the MPLS routes */
+    FOR_EACH_MPLS_EOS_BIT (eos)
+    {
+			fib_prefix_t	pfx = {
+				.fp_len = 21,
+				.fp_proto = FIB_PROTOCOL_MPLS,
+				.fp_label = sr_policy->bsid,
+				.fp_eos = eos,
+				.fp_payload_proto = DPO_PROTO_MPLS,
+			};
+
+      fib_table_entry_path_remove2 (0, &pfx, FIB_SOURCE_SR, paths);
+    }
+    vec_free (paths);
+    vec_free (segment_list->segments);
+    pool_put_index (sm->sid_lists, *sl_index);
+  }
+
+  /* If there is still traces of TE, make sure locks are released */
+  if (sr_policy->endpoint_type != 0 && sr_policy->color != (u32) ~ 0)
+    {
+      sr_mpls_policy_assign_endpoint_color (bsid, NULL, 0, (u32) ~ 0);
+    }
+
+  /* Remove SR policy entry */
+  hash_unset (sm->sr_policies_index_hash, sr_policy->bsid);
+  pool_put (sm->sr_policies, sr_policy);
+
+  if (0 == pool_elts (sm->sr_policies))
+    fib_table_unlock (MPLS_FIB_DEFAULT_TABLE_ID,
+		      FIB_PROTOCOL_MPLS, FIB_SOURCE_SR);
+
+  return 0;
+}
+
+/**
+ * @brief Modify an existing SR policy
+ *
+ * The possible modifications are adding a new Segment List, modifying an
+ * existing Segment List (modify the weight only) and delete a given
+ * Segment List from the SR Policy.
+ *
+ * @param bsid is the bindingSID of the SR Policy
+ * @param fib_table is the VRF where to install the FIB entry for the BSID
+ * @param operation is the operation to perform (among the top ones)
+ * @param segments is a vector of IPv6 address composing the segment list
+ * @param sl_index is the index of the Segment List to modify/delete
+ * @param weight is the weight of the sid list. optional.
+ *
+ * @return 0 ok, >0 index of SL, <0 error
+ */
+int
+sr_mpls_policy_mod (mpls_label_t bsid, u8 operation,
+		    mpls_label_t * segments, u32 sl_index, u32 weight)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+  mpls_sr_policy_t *sr_policy = 0;
+  mpls_sr_sl_t *segment_list;
+  u32 *sl_index_iterate;
+  uword *p;
+
+  if (!sm->sr_policies_index_hash)
+    sm->sr_policies_index_hash = hash_create (0, sizeof (mpls_label_t));
+
+  p = hash_get (sm->sr_policies_index_hash, bsid);
+  if (p)
+    sr_policy = pool_elt_at_index (sm->sr_policies, p[0]);
+  else
+    return -1;
+
+  if (operation == 1)
+    {				/* Add SR List to an existing SR policy */
+      /* Create the new SL */
+      segment_list = create_sl (sr_policy, segments, weight);
+      return segment_list - sm->sid_lists;
+    }
+  else if (operation == 2)
+    {				/* Delete SR List from an existing SR
+				 * policy */
+      /* Check that currently there are more than one SID list */
+      if (vec_len (sr_policy->segments_lists) == 1)
+	return -21;
+
+      /*
+       * Check that the SR list does exist and is assigned to the
+       * sr policy
+       */
+      vec_foreach (sl_index_iterate, sr_policy->segments_lists)
+	if (*sl_index_iterate == sl_index)
+	break;
+
+      if (*sl_index_iterate != sl_index)
+	return -22;
+
+      /* Remove the lucky SR list that is being kicked out */
+      segment_list = pool_elt_at_index (sm->sid_lists, sl_index);
+
+      mpls_eos_bit_t eos;
+      fib_route_path_t path = {
+	.frp_proto = DPO_PROTO_MPLS,
+	.frp_sw_if_index = ~0,
+	.frp_fib_index = 0,
+	.frp_weight = segment_list->weight,
+	.frp_flags = FIB_ROUTE_PATH_FLAG_NONE,
+	.frp_local_label = segment_list->segments[0],
+      };
+
+      vec_add (path.frp_label_stack, segment_list + 1,
+	       vec_len (segment_list) - 1);
+
+      fib_route_path_t *paths = NULL;
+      vec_add1 (paths, path);
+
+      FOR_EACH_MPLS_EOS_BIT (eos)
+      {
+			fib_prefix_t	pfx = {
+				.fp_len = 21,
+				.fp_proto = FIB_PROTOCOL_MPLS,
+				.fp_label = sr_policy->bsid,
+				.fp_eos = eos,
+				.fp_payload_proto = DPO_PROTO_MPLS,
+			};
+
+	fib_table_entry_path_remove2 (0, &pfx, FIB_SOURCE_SR, paths);
+      }
+
+      vec_free (paths);
+      vec_free (segment_list->segments);
+      pool_put_index (sm->sid_lists, sl_index);
+      vec_del1 (sr_policy->segments_lists,
+		sl_index_iterate - sr_policy->segments_lists);
+    }
+  else if (operation == 3)
+    {				/* Modify the weight of an existing
+				 * SR List */
+      /* Find the corresponding SL */
+      vec_foreach (sl_index_iterate, sr_policy->segments_lists)
+	if (*sl_index_iterate == sl_index)
+	break;
+
+      if (*sl_index_iterate != sl_index)
+	return -32;
+
+      /* Change the weight */
+      segment_list = pool_elt_at_index (sm->sid_lists, sl_index);
+
+      /* Update LB */
+      mpls_eos_bit_t eos;
+      fib_route_path_t path = {
+	.frp_proto = DPO_PROTO_MPLS,
+	.frp_sw_if_index = ~0,
+	.frp_fib_index = 0,
+	.frp_weight = segment_list->weight,
+	.frp_flags = FIB_ROUTE_PATH_FLAG_NONE,
+	.frp_local_label = segment_list->segments[0],
+      };
+
+      vec_add (path.frp_label_stack, segment_list + 1,
+	       vec_len (segment_list) - 1);
+
+      fib_route_path_t *paths = NULL;
+      vec_add1 (paths, path);
+
+      FOR_EACH_MPLS_EOS_BIT (eos)
+      {
+			fib_prefix_t	pfx = {
+				.fp_len = 21,
+				.fp_proto = FIB_PROTOCOL_MPLS,
+				.fp_label = sr_policy->bsid,
+				.fp_eos = eos,
+				.fp_payload_proto = DPO_PROTO_MPLS,
+			};
+
+	fib_table_entry_path_remove2 (0, &pfx, FIB_SOURCE_SR, paths);
+      }
+
+      segment_list->weight = weight;
+
+      path.frp_weight = segment_list->weight;
+
+      vec_free (paths);
+      paths = NULL;
+      vec_add1 (paths, path);
+
+      FOR_EACH_MPLS_EOS_BIT (eos)
+      {
+			fib_prefix_t	pfx = {
+				.fp_len = 21,
+				.fp_proto = FIB_PROTOCOL_MPLS,
+				.fp_label = sr_policy->bsid,
+				.fp_eos = eos,
+				.fp_payload_proto = DPO_PROTO_MPLS,
+			};
+
+	fib_table_entry_path_add2 (0,
+				   &pfx,
+				   FIB_SOURCE_SR,
+				   (sr_policy->type ==
+				    SR_POLICY_TYPE_DEFAULT ?
+				    FIB_ENTRY_FLAG_NONE :
+				    FIB_ENTRY_FLAG_MULTICAST), paths);
+      }
+    }
+  return 0;
+}
+
+/**
+ * @brief CLI for 'sr mpls policies' command family
+ */
+static clib_error_t *
+sr_mpls_policy_command_fn (vlib_main_t * vm, unformat_input_t * input,
+			   vlib_cli_command_t * cmd)
+{
+  int rv = -1;
+  char is_del = 0, is_add = 0, is_mod = 0;
+  char policy_set = 0;
+  mpls_label_t bsid, next_label;
+  u32 sl_index = (u32) ~ 0;
+  u32 weight = (u32) ~ 0;
+  mpls_label_t *segments = 0;
+  u8 operation = 0;
+  u8 is_spray = 0;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (!is_add && !is_mod && !is_del && unformat (input, "add"))
+	is_add = 1;
+      else if (!is_add && !is_mod && !is_del && unformat (input, "del"))
+	is_del = 1;
+      else if (!is_add && !is_mod && !is_del && unformat (input, "mod"))
+	is_mod = 1;
+      else if (!policy_set
+	       && unformat (input, "bsid %U", unformat_mpls_unicast_label,
+			    &bsid))
+	policy_set = 1;
+      else if (unformat (input, "weight %d", &weight));
+      else if (unformat
+	       (input, "next %U", unformat_mpls_unicast_label, &next_label))
+	{
+	  vec_add (segments, &next_label, 1);
+	}
+      else if (unformat (input, "add sl"))
+	operation = 1;
+      else if (unformat (input, "del sl index %d", &sl_index))
+	operation = 2;
+      else if (unformat (input, "mod sl index %d", &sl_index))
+	operation = 3;
+      else if (unformat (input, "spray"))
+	is_spray = 1;
+      else
+	break;
+    }
+
+  if (!is_add && !is_mod && !is_del)
+    return clib_error_return (0, "Incorrect CLI");
+
+  if (!policy_set)
+    return clib_error_return (0, "No SR policy BSID or index specified");
+
+  if (is_add)
+    {
+      if (vec_len (segments) == 0)
+	return clib_error_return (0, "No Segment List specified");
+
+      rv = sr_mpls_policy_add (bsid, segments,
+			       (is_spray ? SR_POLICY_TYPE_SPRAY :
+				SR_POLICY_TYPE_DEFAULT), weight);
+      vec_free (segments);
+    }
+  else if (is_del)
+    rv = sr_mpls_policy_del (bsid);
+  else if (is_mod)
+    {
+      if (!operation)
+	return clib_error_return (0, "No SL modification specified");
+      if (operation != 1 && sl_index == (u32) ~ 0)
+	return clib_error_return (0, "No Segment List index specified");
+      if (operation == 1 && vec_len (segments) == 0)
+	return clib_error_return (0, "No Segment List specified");
+      if (operation == 3 && weight == (u32) ~ 0)
+	return clib_error_return (0, "No new weight for the SL specified");
+      rv = sr_mpls_policy_mod (bsid, operation, segments, sl_index, weight);
+      vec_free (segments);
+    }
+  switch (rv)
+    {
+    case 0:
+      break;
+    case 1:
+      return 0;
+    case -12:
+      return clib_error_return (0,
+				"There is already a FIB entry for the BindingSID address.\n"
+				"The SR policy could not be created.");
+    case -21:
+      return clib_error_return (0,
+				"The selected SR policy only contains ONE segment list. "
+				"Please remove the SR policy instead");
+    case -22:
+      return clib_error_return (0,
+				"Could not delete the segment list. "
+				"It is not associated with that SR policy.");
+    case -23:
+      return clib_error_return (0,
+				"Could not delete the segment list. "
+				"It is not associated with that SR policy.");
+    case -32:
+      return clib_error_return (0,
+				"Could not modify the segment list. "
+				"The given SL is not associated with such SR policy.");
+    case VNET_API_ERROR_NO_SUCH_TABLE:
+      return clib_error_return (0, "the Default MPLS table is not present");
+    default:
+      return clib_error_return (0, "BUG: sr policy returns %d", rv);
+    }
+  return 0;
+}
+
+VLIB_CLI_COMMAND(sr_mpls_policy_command, static)=
+{
+	.path = "sr mpls policy",
+		.short_help = "sr mpls policy [add||del||mod] bsid 2999 "
+		"next 10 next 20 next 30 (weight 1) (spray)",
+		.long_help = "TBD.\n",
+		.function = sr_mpls_policy_command_fn,
+};
+
+/**
+ * @brief CLI to display onscreen all the SR MPLS policies
+ */
+static clib_error_t *
+show_sr_mpls_policies_command_fn (vlib_main_t * vm, unformat_input_t * input,
+				  vlib_cli_command_t * cmd)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+  mpls_sr_sl_t *segment_list = 0;
+  mpls_sr_policy_t *sr_policy = 0;
+  mpls_sr_policy_t **vec_policies = 0;
+  mpls_label_t *label;
+  u32 *sl_index;
+  u8 *s;
+  int i = 0;
+
+  vlib_cli_output (vm, "SR MPLS policies:");
+
+	pool_foreach (sr_policy, sm->sr_policies) {
+		vec_add1(vec_policies, sr_policy);
+	}
+
+  vec_foreach_index (i, vec_policies)
+  {
+    sr_policy = vec_policies[i];
+    vlib_cli_output (vm, "[%u].-\tBSID: %U",
+		     (u32) (sr_policy - sm->sr_policies),
+		     format_mpls_unicast_label, sr_policy->bsid);
+    switch (sr_policy->endpoint_type)
+      {
+      case SR_STEER_IPV6:
+	vlib_cli_output (vm, "\tEndpoint: %U", format_ip6_address,
+			 &sr_policy->endpoint.ip6);
+	vlib_cli_output (vm, "\tColor: %u", sr_policy->color);
+	break;
+      case SR_STEER_IPV4:
+	vlib_cli_output (vm, "\tEndpoint: %U", format_ip4_address,
+			 &sr_policy->endpoint.ip4);
+	vlib_cli_output (vm, "\tColor: %u", sr_policy->color);
+	break;
+      default:
+	vlib_cli_output (vm, "\tTE disabled");
+      }
+    vlib_cli_output (vm, "\tType: %s",
+		     (sr_policy->type ==
+		      SR_POLICY_TYPE_DEFAULT ? "Default" : "Spray"));
+    vlib_cli_output (vm, "\tSegment Lists:");
+    vec_foreach (sl_index, sr_policy->segments_lists)
+    {
+      s = NULL;
+      segment_list = pool_elt_at_index (sm->sid_lists, *sl_index);
+      s = format (s, "\t[%u].- ", *sl_index);
+      s = format (s, "< ");
+      vec_foreach (label, segment_list->segments)
+      {
+	s = format (s, "%U, ", format_mpls_unicast_label, *label);
+      }
+      s = format (s, "\b\b > ");
+      vlib_cli_output (vm, "  %s", s);
+    }
+    vlib_cli_output (vm, "-----------");
+  }
+  vec_free (vec_policies);
+  return 0;
+}
+
+VLIB_CLI_COMMAND(show_sr_mpls_policies_command, static)=
+{
+	.path = "show sr mpls policies",
+		.short_help = "show sr mpls policies",
+		.function = show_sr_mpls_policies_command_fn,
+};
+
+/**
+ * @brief Update the Endpoint,Color tuple of an SR policy
+ *
+ * @param bsid is the bindingSID of the SR Policy
+ * @param endpoint represents the IP46 of the endpoint
+ * @param color represents the color (u32)
+ *
+ * To reset to NULL use ~0 as parameters.
+ *
+ * @return 0 if correct, else error
+ */
+int
+sr_mpls_policy_assign_endpoint_color (mpls_label_t bsid,
+				      ip46_address_t * endpoint,
+				      u8 endpoint_type, u32 color)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+  mpls_sr_policy_t *sr_policy = 0;
+  uword *endpoint_table, *p, *old_value;
+
+  ip46_address_t any;
+  any.as_u64[0] = any.as_u64[1] = (u64) ~ 0;
+
+  if (!sm->sr_policies_index_hash)
+    sm->sr_policies_index_hash = hash_create (0, sizeof (mpls_label_t));
+
+  p = hash_get (sm->sr_policies_index_hash, bsid);
+  if (p)
+    sr_policy = pool_elt_at_index (sm->sr_policies, p[0]);
+  else
+    return -1;
+
+  /* If previous Endpoint, color existed, remove (NH,C) and (ANY,C) */
+  if (sr_policy->endpoint_type)
+    {
+      endpoint_table =
+	mhash_get (&sm->sr_policies_c2e2eclabel_hash, &sr_policy->color);
+      if (!endpoint_table)
+	return -2;
+      old_value =
+	mhash_get ((mhash_t *) endpoint_table, &sr_policy->endpoint);
+
+      /* CID 180995 This should never be NULL unless the two hash tables
+       * get out of sync */
+      ALWAYS_ASSERT (old_value != NULL);
+
+      fib_prefix_t pfx = { 0 };
+      pfx.fp_proto = FIB_PROTOCOL_MPLS;
+      pfx.fp_len = 21;
+      pfx.fp_label = (u32) * old_value;
+
+      mpls_eos_bit_t eos;
+      FOR_EACH_MPLS_EOS_BIT (eos)
+      {
+	pfx.fp_eos = eos;
+	fib_table_entry_path_remove (sm->fib_table_EC,
+				     &pfx,
+				     FIB_SOURCE_SR,
+				     DPO_PROTO_MPLS,
+				     NULL,
+				     ~0, 0, 1, FIB_ROUTE_PATH_FLAG_NONE);
+      }
+
+      old_value = mhash_get ((mhash_t *) endpoint_table, &any);
+      pfx.fp_label = (u32) * old_value;
+
+      FOR_EACH_MPLS_EOS_BIT (eos)
+      {
+	pfx.fp_eos = eos;
+	fib_table_entry_path_remove (sm->fib_table_EC,
+				     &pfx,
+				     FIB_SOURCE_SR,
+				     DPO_PROTO_MPLS,
+				     NULL,
+				     ~0, 0, 1, FIB_ROUTE_PATH_FLAG_NONE);
+      }
+
+      /* Release the lock on (NH, Color) and (ANY, Color) */
+      internal_label_unlock (sr_policy->endpoint, sr_policy->color);
+      internal_label_unlock (any, sr_policy->color);
+
+      /* Reset the values on the SR policy */
+      sr_policy->endpoint_type = 0;
+      sr_policy->endpoint.as_u64[0] = sr_policy->endpoint.as_u64[1] =
+	(u64) ~ 0;
+      sr_policy->color = (u32) ~ 0;
+    }
+
+  if (endpoint_type)
+    {
+      sr_policy->endpoint_type = endpoint_type;
+      sr_policy->endpoint.as_u64[0] = endpoint->as_u64[0];
+      sr_policy->endpoint.as_u64[1] = endpoint->as_u64[1];
+      sr_policy->color = color;
+
+      u32 label = find_or_create_internal_label (*endpoint, color);
+      internal_label_lock (*endpoint, sr_policy->color);
+
+      /* If FIB doesnt exist, create them */
+      if (sm->fib_table_EC == (u32) ~ 0)
+	{
+	  sm->fib_table_EC = fib_table_create_and_lock (FIB_PROTOCOL_MPLS,
+							FIB_SOURCE_SR,
+							"SR-MPLS Traffic Engineering (NextHop,Color)");
+
+	  fib_table_flush (sm->fib_table_EC, FIB_PROTOCOL_MPLS,
+			   FIB_SOURCE_SPECIAL);
+	}
+
+      fib_prefix_t pfx = { 0 };
+      pfx.fp_proto = FIB_PROTOCOL_MPLS;
+      pfx.fp_len = 21;
+
+      fib_route_path_t path = {
+	.frp_proto = DPO_PROTO_MPLS,
+	.frp_sw_if_index = ~0,
+	.frp_fib_index = 0,
+	.frp_weight = 1,
+	.frp_flags = FIB_ROUTE_PATH_FLAG_NONE,
+	.frp_label_stack = 0
+      };
+      path.frp_local_label = sr_policy->bsid;
+
+      //Add the entry to ANY,Color
+      u32 any_label = find_or_create_internal_label (any, color);
+      internal_label_lock (any, sr_policy->color);
+
+      pfx.fp_eos = MPLS_EOS;
+      path.frp_eos = MPLS_EOS;
+
+      fib_route_path_t *paths = NULL;
+      vec_add1 (paths, path);
+
+      pfx.fp_label = label;
+      fib_table_entry_update (sm->fib_table_EC,
+			      &pfx,
+			      FIB_SOURCE_SR,
+			      FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
+
+      pfx.fp_label = any_label;
+      fib_table_entry_update (sm->fib_table_EC,
+			      &pfx,
+			      FIB_SOURCE_SR,
+			      FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
+
+      fib_mpls_label_t fml = {
+	.fml_value = MPLS_IETF_IMPLICIT_NULL_LABEL,
+      };
+
+      vec_add1 (path.frp_label_stack, fml);
+      pfx.fp_eos = MPLS_NON_EOS;
+      path.frp_eos = MPLS_NON_EOS;
+
+      paths = NULL;
+      vec_add1 (paths, path);
+
+      pfx.fp_label = label;
+      fib_table_entry_update (sm->fib_table_EC,
+			      &pfx,
+			      FIB_SOURCE_SR,
+			      FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
+
+      pfx.fp_label = any_label;
+      fib_table_entry_update (sm->fib_table_EC,
+			      &pfx,
+			      FIB_SOURCE_SR,
+			      FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
+    }
+  return 0;
+}
+
+/**
+ * @brief CLI to modify the Endpoint,Color of an SR policy
+ */
+static clib_error_t *
+cli_sr_mpls_policy_ec_command_fn (vlib_main_t * vm, unformat_input_t * input,
+				  vlib_cli_command_t * cmd)
+{
+  ip46_address_t endpoint;
+  u32 color = (u32) ~ 0;
+  mpls_label_t bsid;
+  u8 endpoint_type = 0;
+  char clear = 0, color_set = 0, bsid_set = 0;
+
+  clib_memset (&endpoint, 0, sizeof (ip46_address_t));
+
+  int rv;
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (!endpoint_type
+	  && unformat (input, "endpoint %U", unformat_ip6_address,
+		       &endpoint.ip6))
+	endpoint_type = SR_STEER_IPV6;
+      else if (!endpoint_type
+	       && unformat (input, "endpoint %U", unformat_ip4_address,
+			    &endpoint.ip4))
+	endpoint_type = SR_STEER_IPV4;
+      else if (!color_set && unformat (input, "color %u", &color))
+	color_set = 1;
+      else if (!bsid_set
+	       && unformat (input, "bsid %U", unformat_mpls_unicast_label,
+			    &bsid))
+	bsid_set = 1;
+      else if (!clear && unformat (input, "clear"))
+	clear = 1;
+      else
+	break;
+    }
+
+  if (!bsid_set)
+    return clib_error_return (0, "No BSID specified");
+  if (!endpoint_type && !clear)
+    return clib_error_return (0, "No Endpoint specified");
+  if (!color_set && !clear)
+    return clib_error_return (0, "No Color set");
+
+  /* In case its a cleanup */
+  if (clear)
+    {
+      ip6_address_set_zero (&endpoint.ip6);
+      color = (u32) ~ 0;
+    }
+  rv =
+    sr_mpls_policy_assign_endpoint_color (bsid, &endpoint, endpoint_type,
+					  color);
+
+  if (rv)
+    clib_error_return (0, "Error on Endpoint,Color");
+
+  return 0;
+}
+
+VLIB_CLI_COMMAND(cli_sr_mpls_policy_ec_command, static)=
+{
+	.path = "sr mpls policy te",
+		.short_help = "sr mpls policy te bsid xxxxx endpoint x.x.x.x color 12341234",
+		.function = cli_sr_mpls_policy_ec_command_fn,
+};
+
+/********************* SR MPLS Policy initialization ***********************/
+/**
+ * @brief SR MPLS Policy  initialization
+ */
+clib_error_t *
+sr_mpls_policy_rewrite_init (vlib_main_t * vm)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+
+  /* Init memory for sr policy keys (bsid <-> ip6_address_t) */
+  sm->sr_policies_index_hash = NULL;
+  sm->sr_policies_c2e2eclabel_hash.hash = NULL;
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (sr_mpls_policy_rewrite_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables: eval: (c-set-style "gnu") End:
+ */