First commit SR MPLS

Change-Id: I961685a2a0e4c314049444c64eb6ccf877c278dd
Signed-off-by: Pablo Camarillo <pcamaril@cisco.com>

5 files changed, 1283 insertions, 0 deletions

diff --git a/src/vnet/srmpls/dir.dox b/src/vnet/srmpls/dir.dox
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+/*
+ *
+ * Copyright (c) 2013 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.
+ */
+/**
+ @dir
+ @brief Segment Routing MPLS code
+
+ An implementation of Segment Routing for the MPLS dataplane.
+
+*/
\ No newline at end of file
diff --git a/src/vnet/srmpls/sr.h b/src/vnet/srmpls/sr.h
new file mode 100755
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+++ b/src/vnet/srmpls/sr.h
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2015 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 Segment Routing MPLS data structures definitions
+ *
+ */
+
+#ifndef included_vnet_srmpls_h
+#define included_vnet_srmpls_h
+
+#include <vnet/vnet.h>
+#include <vnet/mpls/packet.h>
+#include <vnet/fib/mpls_fib.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/lookup.h>
+#include <vnet/dpo/dpo.h>
+#include <vnet/dpo/replicate_dpo.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+/* SR policy types */
+#define SR_POLICY_TYPE_DEFAULT 0
+#define SR_POLICY_TYPE_SPRAY 1
+
+#define SR_SEGMENT_LIST_WEIGHT_DEFAULT 1
+
+#define SR_STEER_IPV4 4
+#define SR_STEER_IPV6 6
+
+/**
+ * @brief SR Segment List (SID list)
+ */
+typedef struct
+{
+  /**
+    * SIDs (key)
+    */
+  mpls_label_t *segments;
+
+  /**
+    * SID list weight (wECMP / UCMP)
+    */
+  u32 weight;
+
+} mpls_sr_sl_t;
+
+typedef struct
+{
+  u32 *segments_lists;		/**< Pool of SID lists indexes */
+
+  mpls_label_t bsid;		/**< BindingSID (key) */
+
+  u8 type;					/**< Type (default is 0) */
+  /* SR Policy specific DPO                                       */
+  /* IF Type = DEFAULT Then Load Balancer DPO among SID lists     */
+  /* IF Type = SPRAY then Spray DPO with all SID lists            */
+
+} mpls_sr_policy_t;
+
+/**
+ * @brief Steering db key
+ *
+ * L3 is IPv4/IPv6 + mask
+ */
+typedef struct
+{
+  ip46_address_t prefix;	/**< IP address of the prefix */
+  u32 mask_width;			/**< Mask width of the prefix */
+  u32 fib_table;			/**< VRF of the prefix */
+  u8 traffic_type;			/**< Traffic type (IPv4, IPv6, L2) */
+  u8 padding[3];
+} sr_mpls_steering_key_t;
+
+typedef struct
+{
+  sr_mpls_steering_key_t classify;		/**< Traffic classification */
+  u32 sr_policy;						/**< SR Policy index */
+} mpls_sr_steering_policy_t;
+
+/**
+ * @brief Segment Routing main datastructure
+ */
+typedef struct
+{
+  /**
+    * SR SID lists
+    */
+  mpls_sr_sl_t *sid_lists;
+
+  /**
+    * SR MPLS policies
+    */
+  mpls_sr_policy_t *sr_policies;
+
+  /**
+    * Hash table mapping BindingSID to SR MPLS policy
+    */
+  uword *sr_policies_index_hash;
+
+  /**
+    * Pool of SR steer policies instances
+    */
+  mpls_sr_steering_policy_t *steer_policies;
+
+  /**
+    * MHash table mapping steering rules to SR steer instance
+    */
+  mhash_t sr_steer_policies_hash;
+
+  /**
+    * convenience
+    */
+  vlib_main_t *vlib_main;
+  vnet_main_t *vnet_main;
+} mpls_sr_main_t;
+
+extern mpls_sr_main_t sr_mpls_main;
+
+extern int
+sr_mpls_policy_add (mpls_label_t bsid, mpls_label_t * segments,
+		    u8 behavior, u32 weight);
+
+extern int
+sr_mpls_policy_mod (mpls_label_t bsid, u32 index, u8 operation,
+		    mpls_label_t * segments, u32 sl_index, u32 weight);
+
+extern int sr_mpls_policy_del (mpls_label_t bsid, u32 index);
+
+#endif /* included_vnet_sr_mpls_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/srmpls/sr_doc.md b/src/vnet/srmpls/sr_doc.md
new file mode 100644
index 00000000000..d60592bb74d
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+++ b/src/vnet/srmpls/sr_doc.md
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+# SR-MPLS: Segment Routing for MPLS    {#srmpls_doc}
+
+This is a memo intended to contain documentation of the VPP SR-MPLS implementation.
+Everything that is not directly obvious should come here.
+For any feedback on content that should be explained please mailto:pcamaril@cisco.com
+
+## Segment Routing
+
+Segment routing is a network technology focused on addressing the limitations of existing IP and Multiprotocol Label Switching (MPLS) networks in terms of simplicity, scale, and ease of operation. It is a foundation for application engineered routing as it prepares the networks for new business models where applications can control the network behavior.
+
+Segment routing seeks the right balance between distributed intelligence and centralized optimization and programming. It was built for the software-defined networking (SDN) era.
+
+Segment routing enhances packet forwarding behavior by enabling a network to transport unicast packets through a specific forwarding path, different from the normal path that a packet usually takes (IGP shortest path or BGP best path). This capability benefits many use cases, and one can build those specific paths based on application requirements.
+
+Segment routing uses the source routing paradigm. A node, usually a router but also a switch, a trusted server, or a virtual forwarder running on a hypervisor, steers a packet through an ordered list of instructions, called segments. A segment can represent any instruction, topological or service-based. A segment can have a local semantic to a segment-routing node or global within a segment-routing network. Segment routing allows an operator to enforce a flow through any topological path and service chain while maintaining per-flow state only at the ingress node to the segment-routing network. Segment routing also supports equal-cost multipath (ECMP) by design.
+
+Segment routing can operate with either an MPLS or an IPv6 data plane. All the currently available MPLS services, such as Layer 3 VPN (L3VPN), L2VPN (Virtual Private Wire Service [VPWS], Virtual Private LAN Services [VPLS], Ethernet VPN [E-VPN], and Provider Backbone Bridging Ethernet VPN [PBB-EVPN]), can run on top of a segment-routing transport network.
+
+**The implementation of Segment Routing in VPP covers both the IPv6 data plane (SRv6) as well as the MPLS data plane (SR-MPLS). This page contains the SR-MPLS documentation.**
+
+## Segment Routing terminology
+
+* SegmentID (SID): is an MPLS label.
+* Segment List (SL) (SID List): is the sequence of SIDs that the packet will traverse.
+* SR Policy: is a set of candidate paths (SID list+weight). An SR policy is uniquely identified by its Binding SID and associated with a weighted set of Segment Lists. In case several SID lists are defined, traffic steered into the policy is unevenly load-balanced among them according to their respective weights.
+* BindingSID: a BindingSID is a SID (only one) associated one-one with an SR Policy. If a packet arrives with MPLS label corresponding to a BindingSID, then the SR policy will be applied to such packet. (BindingSID is popped first.)
+
+## SR-MPLS features in VPP
+
+The SR-MPLS implementation is focused on the SR policies, as well on its steering. Others SR-MPLS features, such as for example AdjSIDs, can be achieved using the regular VPP MPLS implementation.
+
+The <a href="https://datatracker.ietf.org/doc/draft-filsfils-spring-segment-routing-policy/">Segment Routing Policy (*draft-filsfils-spring-segment-routing-policy*)</a> defines SR Policies.
+
+## Creating a SR Policy
+
+An SR Policy is defined by a Binding SID and a weighted set of Segment Lists.
+
+A new SR policy is created with a first SID list using:
+
+    sr mpls policy add bsid 40001 next 16001 next 16002 next 16003 (weight 5)
+
+* The weight parameter is only used if more than one SID list is associated with the policy.
+
+An SR policy is deleted with:
+
+    sr mpls policy del bsid 40001
+
+The existing SR policies are listed with:
+
+    show sr mpls policies
+
+### Adding/Removing SID Lists from an SR policy
+
+An additional SID list is associated with an existing SR policy with:
+
+    sr mpls policy mod bsid 40001 add sl next 16001 next 16002 next 16003 (weight 3)
+
+Conversely, a SID list can be removed from an SR policy with:
+
+    sr mpls policy mod bsid 4001 del sl index 1
+
+Note that this CLI cannot be used to remove the last SID list of a policy. Instead the SR policy delete CLI must be used.
+
+The weight of a SID list can also be modified with:
+
+    sr mpls policy mod bsid 40001 mod sl index 1 weight 4
+    sr mpls policy mod index 1    mod sl index 1 weight 4
+
+### SR Policies: Spray policies
+
+Spray policies are a specific type of SR policies where the packet is replicated on all the SID lists, rather than load-balanced among them.
+
+SID list weights are ignored with this type of policies.
+
+A Spray policy is instantiated by appending the keyword **spray** to a regular SR-MPLS policy command, as in:
+
+    sr mpls policy add bsid 40002 next 16001 next 16002 next 16003 spray
+
+Spray policies are used for removing multicast state from a network core domain, and instead send a linear unicast copy to every access node. The last SID in each list accesses the multicast tree within the access node.  
+
+## Steering packets into a SR Policy
+
+To steer packets in Transit into an SR policy, the user needs to create an 'sr steering policy'.
+
+    sr mpls steer l3 2001::/64 via sr policy bsid 40001
+    sr mpls steer l3 2001::/64 via sr policy bsid 40001 fib-table 3
+    sr mpls steer l3 10.0.0.0/16 via sr policy bsid 40001
diff --git a/src/vnet/srmpls/sr_mpls_policy.c b/src/vnet/srmpls/sr_mpls_policy.c
new file mode 100755
index 00000000000..5ebbc60d3b8
--- /dev/null
+++ b/src/vnet/srmpls/sr_mpls_policy.c
@@ -0,0 +1,569 @@
+/*
+ * 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.
+ *
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/srmpls/sr.h>
+#include <vnet/fib/mpls_fib.h>
+#include <vnet/dpo/dpo.h>
+#include <vnet/dpo/replicate_dpo.h>
+#include <vnet/dpo/mpls_label_dpo.h>
+#include <vnet/dpo/lookup_dpo.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;
+
+  pool_get (sm->sid_lists, segment_list);
+  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);
+
+  fib_route_path_t path = {
+    .frp_proto = FIB_PROTOCOL_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],
+  };
+
+  vec_add (path.frp_label_stack, sl + 1, vec_len (sl) - 1);
+
+  fib_route_path_t *paths = NULL;
+  vec_add1 (paths, path);
+
+  mpls_eos_bit_t eos;
+  FOR_EACH_MPLS_EOS_BIT (eos)
+  {
+    /* *INDENT-OFF* */
+    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,
+    };
+    /* *INDENT-ON* */
+
+    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;
+
+  /* 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);
+  memset (sr_policy, 0, sizeof (*sr_policy));
+  sr_policy->bsid = bsid;
+  sr_policy->type = behavior;
+
+  /* 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, u32 index)
+{
+  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 (bsid)
+    {
+      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;
+    }
+  else
+    {
+      sr_policy = pool_elt_at_index (sm->sr_policies, index);
+      if (!sr_policy)
+	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 = FIB_PROTOCOL_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],
+    };
+
+    fib_route_path_t *paths = NULL;
+    vec_add1 (paths, path);
+
+    /* remove each of the MPLS routes */
+    FOR_EACH_MPLS_EOS_BIT (eos)
+    {
+      /* *INDENT-OFF* */
+      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,
+      };
+      /* *INDENT-ON* */
+
+      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);
+  }
+
+  /* Remove SR policy entry */
+  hash_unset (sm->sr_policies_index_hash, sr_policy->bsid);
+  pool_put (sm->sr_policies, sr_policy);
+
+  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 index is the index 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 if correct, else error
+ */
+int
+sr_mpls_policy_mod (mpls_label_t bsid, u32 index, 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 (bsid)
+    {
+      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;
+    }
+  else
+    {
+      sr_policy = pool_elt_at_index (sm->sr_policies, index);
+      if (!sr_policy)
+	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);
+
+    }
+  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 = FIB_PROTOCOL_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],
+      };
+
+      fib_route_path_t *paths = NULL;
+      vec_add1 (paths, path);
+
+      FOR_EACH_MPLS_EOS_BIT (eos)
+      {
+	/* *INDENT-OFF* */
+        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,
+        };
+	/* *INDENT-ON* */
+
+	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);
+      segment_list->weight = weight;
+
+      /* Update LB */
+      //FIXME
+    }
+  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 sr_policy_index = (u32) ~ 0, 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 (!is_add && !policy_set
+	       && unformat (input, "index %d", &sr_policy_index))
+	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);
+    }
+  else if (is_del)
+    rv =
+      sr_mpls_policy_del ((sr_policy_index != (u32) ~ 0 ? (u32) ~ 0 : bsid),
+			  sr_policy_index);
+  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 ((sr_policy_index != (u32) ~ 0 ? (u32) ~ 0 : bsid),
+			    sr_policy_index, operation, segments,
+			    sl_index, weight);
+    }
+
+  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 -32:
+      return clib_error_return (0,
+				"Could not modify the segment list. "
+				"The given SL is not associated with such SR policy.");
+    default:
+      return clib_error_return (0, "BUG: sr policy returns %d", rv);
+    }
+  return 0;
+}
+
+/* *INDENT-OFF* */
+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,
+};
+/* *INDENT-ON* */
+
+/**
+ * @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:");
+
+  /* *INDENT-OFF* */
+		pool_foreach  (sr_policy, sm->sr_policies, {vec_add1 (vec_policies, sr_policy); } );
+  /* *INDENT-ON* */
+
+  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);
+    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;
+}
+
+/* *INDENT-OFF* */
+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,
+};
+/* *INDENT-ON* */
+
+/********************* 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 = hash_create (0, sizeof (mpls_label_t));
+
+  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:
+*/
diff --git a/src/vnet/srmpls/sr_mpls_steering.c b/src/vnet/srmpls/sr_mpls_steering.c
new file mode 100755
index 00000000000..37707049e85
--- /dev/null
+++ b/src/vnet/srmpls/sr_mpls_steering.c
@@ -0,0 +1,453 @@
+/*
+ * sr_steering.c: ipv6 segment routing steering into SR policy
+ *
+ * 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 Packet steering into SR-MPLS Policies
+ *
+ * This file is in charge of handling the FIB appropiatly to steer packets
+ * through SR Policies as defined in 'sr_mpls_policy.c'. Notice that here
+ * we are only doing steering. SR policy application is done in
+ * sr_policy_rewrite.c
+ *
+ * Supports:
+ *  - Steering of IPv6 traffic Destination Address based
+ *  - Steering of IPv4 traffic Destination Address based
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/srmpls/sr.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/fib/mpls_fib.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+/**
+ * @brief Steer traffic L3 traffic through a given SR-MPLS policy
+ *
+ * @param is_del
+ * @param bsid is the bindingSID of the SR Policy (alt to sr_policy_index)
+ * @param sr_policy is the index of the SR Policy (alt to bsid)
+ * @param table_id is the VRF where to install the FIB entry for the BSID
+ * @param prefix is the IPv4/v6 address for L3 traffic type
+ * @param mask_width is the mask for L3 traffic type
+ * @param traffic_type describes the type of traffic
+ *
+ * @return 0 if correct, else error
+ */
+int
+sr_mpls_steering_policy (int is_del, mpls_label_t bsid, u32 sr_policy_index,
+			 u32 table_id, ip46_address_t * prefix,
+			 u32 mask_width, u8 traffic_type)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+  sr_mpls_steering_key_t key;
+  mpls_sr_steering_policy_t *steer_pl;
+  fib_prefix_t pfx = { 0 };
+
+  mpls_sr_policy_t *sr_policy = 0;
+  uword *p = 0;
+
+  memset (&key, 0, sizeof (sr_mpls_steering_key_t));
+
+  /* Compute the steer policy key */
+  if (traffic_type == SR_STEER_IPV4 || traffic_type == SR_STEER_IPV6)
+    {
+      key.prefix.as_u64[0] = prefix->as_u64[0];
+      key.prefix.as_u64[1] = prefix->as_u64[1];
+      key.mask_width = mask_width;
+      key.fib_table = (table_id != (u32) ~ 0 ? table_id : 0);
+    }
+  else
+    return -1;
+
+  key.traffic_type = traffic_type;
+
+  /* Search for the item */
+  p = mhash_get (&sm->sr_steer_policies_hash, &key);
+
+  if (p)
+    {
+      /* Retrieve Steer Policy function */
+      steer_pl = pool_elt_at_index (sm->steer_policies, p[0]);
+
+      if (is_del)
+	{
+	  if (steer_pl->classify.traffic_type == SR_STEER_IPV6)
+	    {
+	      /* Remove FIB entry */
+	      pfx.fp_proto = FIB_PROTOCOL_IP6;
+	      pfx.fp_len = steer_pl->classify.mask_width;
+	      pfx.fp_addr.ip6 = steer_pl->classify.prefix.ip6;
+
+	      fib_table_entry_delete (fib_table_find
+				      (FIB_PROTOCOL_MPLS,
+				       steer_pl->classify.fib_table), &pfx,
+				      FIB_SOURCE_SR);
+	    }
+	  else if (steer_pl->classify.traffic_type == SR_STEER_IPV4)
+	    {
+	      /* Remove FIB entry */
+	      pfx.fp_proto = FIB_PROTOCOL_IP4;
+	      pfx.fp_len = steer_pl->classify.mask_width;
+	      pfx.fp_addr.ip4 = steer_pl->classify.prefix.ip4;
+
+	      fib_table_entry_delete (fib_table_find
+				      (FIB_PROTOCOL_MPLS,
+				       steer_pl->classify.fib_table), &pfx,
+				      FIB_SOURCE_SR);
+	    }
+
+	  /* Delete SR steering policy entry */
+	  pool_put (sm->steer_policies, steer_pl);
+	  mhash_unset (&sm->sr_steer_policies_hash, &key, NULL);
+
+	  return 1;
+	}
+      else			/* It means user requested to update an existing SR steering policy */
+	{
+	  /* Retrieve SR steering policy */
+	  if (bsid)		//TODO FIXME
+	    {
+	      p = hash_get (sm->sr_policies_index_hash, bsid);
+	      if (p)
+		sr_policy = pool_elt_at_index (sm->sr_policies, p[0]);
+	      else
+		return -2;
+	    }
+	  else
+	    sr_policy = pool_elt_at_index (sm->sr_policies, sr_policy_index);
+
+	  if (!sr_policy)
+	    return -2;
+
+	  steer_pl->sr_policy = sr_policy - sm->sr_policies;
+
+	  /* Remove old FIB/hw redirection and create a new one */
+	  if (steer_pl->classify.traffic_type == SR_STEER_IPV6)
+	    {
+	      /* Remove FIB entry */
+	      pfx.fp_proto = FIB_PROTOCOL_IP6;
+	      pfx.fp_len = steer_pl->classify.mask_width;
+	      pfx.fp_addr.ip6 = steer_pl->classify.prefix.ip6;
+
+	      fib_table_entry_delete (fib_table_find
+				      (FIB_PROTOCOL_IP6,
+				       steer_pl->classify.fib_table), &pfx,
+				      FIB_SOURCE_SR);
+
+	      /* Create a new one */
+	      goto update_fib;
+	    }
+	  else if (steer_pl->classify.traffic_type == SR_STEER_IPV4)
+	    {
+	      /* Remove FIB entry */
+	      pfx.fp_proto = FIB_PROTOCOL_IP4;
+	      pfx.fp_len = steer_pl->classify.mask_width;
+	      pfx.fp_addr.ip4 = steer_pl->classify.prefix.ip4;
+
+	      fib_table_entry_delete (fib_table_find
+				      (FIB_PROTOCOL_IP4,
+				       steer_pl->classify.fib_table), &pfx,
+				      FIB_SOURCE_SR);
+
+	      /* Create a new one */
+	      goto update_fib;
+	    }
+	}
+    }
+  else
+    /* delete; steering policy does not exist; complain */
+  if (is_del)
+    return -4;
+
+  /* Retrieve SR policy */
+  if (bsid)			//FIX
+    {
+      p = hash_get (sm->sr_policies_index_hash, bsid);
+      if (p)
+	sr_policy = pool_elt_at_index (sm->sr_policies, p[0]);
+      else
+	return -2;
+    }
+  else
+    sr_policy = pool_elt_at_index (sm->sr_policies, sr_policy_index);
+
+  /* Create a new steering policy */
+  pool_get (sm->steer_policies, steer_pl);
+  memset (steer_pl, 0, sizeof (*steer_pl));
+
+  if (traffic_type == SR_STEER_IPV4 || traffic_type == SR_STEER_IPV6)
+    {
+      clib_memcpy (&steer_pl->classify.prefix, prefix,
+		   sizeof (ip46_address_t));
+      steer_pl->classify.mask_width = mask_width;
+      steer_pl->classify.fib_table = (table_id != (u32) ~ 0 ? table_id : 0);
+      steer_pl->classify.traffic_type = traffic_type;
+    }
+  else
+    {
+      /* Incorrect API usage. Should never get here */
+      pool_put (sm->steer_policies, steer_pl);
+      mhash_unset (&sm->sr_steer_policies_hash, &key, NULL);
+      return -1;
+    }
+  steer_pl->sr_policy = sr_policy - sm->sr_policies;
+
+  /* Create and store key */
+  mhash_set (&sm->sr_steer_policies_hash, &key, steer_pl - sm->steer_policies,
+	     NULL);
+
+update_fib:;
+
+  fib_route_path_t path = {
+    .frp_proto = FIB_PROTOCOL_MPLS,
+    .frp_local_label = sr_policy->bsid,
+    .frp_eos = MPLS_EOS,
+    .frp_sw_if_index = ~0,
+    .frp_fib_index = 0,
+    .frp_weight = 1,
+    .frp_flags = FIB_ROUTE_PATH_FLAG_NONE,
+    .frp_label_stack = NULL
+  };
+
+  fib_route_path_t *paths = NULL;
+
+  /* FIB API calls - Recursive route through the BindingSID */
+  if (traffic_type == SR_STEER_IPV6)
+    {
+      pfx.fp_proto = FIB_PROTOCOL_IP6;
+      pfx.fp_len = steer_pl->classify.mask_width;
+      pfx.fp_addr.ip6 = steer_pl->classify.prefix.ip6;
+      path.frp_fib_index = 0;
+
+      vec_add1 (paths, path);
+
+      fib_table_entry_path_add2 (fib_table_find
+				 (FIB_PROTOCOL_IP6,
+				  (table_id != (u32) ~ 0 ? table_id : 0)),
+				 &pfx, FIB_SOURCE_SR,
+				 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
+
+      vec_free (paths);
+    }
+  else if (traffic_type == SR_STEER_IPV4)
+    {
+      pfx.fp_proto = FIB_PROTOCOL_IP4;
+      pfx.fp_len = steer_pl->classify.mask_width;
+      pfx.fp_addr.ip4 = steer_pl->classify.prefix.ip4;
+      path.frp_fib_index = 0;
+
+      vec_add1 (paths, path);
+
+      fib_table_entry_path_add2 (fib_table_find
+				 (FIB_PROTOCOL_IP4,
+				  (table_id != (u32) ~ 0 ? table_id : 0)),
+				 &pfx, FIB_SOURCE_SR,
+				 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
+
+      vec_free (paths);
+    }
+
+  return 0;
+}
+
+static clib_error_t *
+sr_mpls_steer_policy_command_fn (vlib_main_t * vm, unformat_input_t * input,
+				 vlib_cli_command_t * cmd)
+{
+  int is_del = 0;
+
+  ip46_address_t prefix;
+  u32 dst_mask_width = 0;
+  u8 traffic_type = 0;
+  u32 fib_table = (u32) ~ 0;
+
+  mpls_label_t bsid;
+  u32 sr_policy_index = (u32) ~ 0;
+
+  u8 sr_policy_set = 0;
+
+  memset (&prefix, 0, sizeof (ip46_address_t));
+
+  int rv;
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "del"))
+	is_del = 1;
+      else if (!traffic_type
+	       && unformat (input, "l3 %U/%d", unformat_ip6_address,
+			    &prefix.ip6, &dst_mask_width))
+	traffic_type = SR_STEER_IPV6;
+      else if (!traffic_type
+	       && unformat (input, "l3 %U/%d", unformat_ip4_address,
+			    &prefix.ip4, &dst_mask_width))
+	traffic_type = SR_STEER_IPV4;
+      else if (!sr_policy_set
+	       && unformat (input, "via sr policy index %d",
+			    &sr_policy_index))
+	sr_policy_set = 1;
+      else if (!sr_policy_set
+	       && unformat (input, "via sr policy bsid %U",
+			    unformat_mpls_unicast_label, &bsid))
+	sr_policy_set = 1;
+      else if (fib_table == (u32) ~ 0
+	       && unformat (input, "fib-table %d", &fib_table));
+      else
+	break;
+    }
+
+  if (!traffic_type)
+    return clib_error_return (0, "No L3 traffic specified");
+  if (!sr_policy_set)
+    return clib_error_return (0, "No SR policy specified");
+
+  /* Make sure that the prefixes are clean */
+  if (traffic_type == SR_STEER_IPV4)
+    {
+      u32 mask =
+	(dst_mask_width ? (0xFFFFFFFFu >> (32 - dst_mask_width)) : 0);
+      prefix.ip4.as_u32 &= mask;
+    }
+  else if (traffic_type == SR_STEER_IPV6)
+    {
+      ip6_address_t mask;
+      ip6_address_mask_from_width (&mask, dst_mask_width);
+      ip6_address_mask (&prefix.ip6, &mask);
+    }
+
+  rv =
+    sr_mpls_steering_policy (is_del, bsid,
+			     sr_policy_index, fib_table, &prefix,
+			     dst_mask_width, traffic_type);
+
+  switch (rv)
+    {
+    case 0:
+      break;
+    case 1:
+      return 0;
+    case -1:
+      return clib_error_return (0, "Incorrect API usage.");
+    case -2:
+      return clib_error_return (0,
+				"The requested SR policy could not be located. Review the BSID/index.");
+    case -3:
+      return clib_error_return (0,
+				"Unable to do SW redirect. Incorrect interface.");
+    case -4:
+      return clib_error_return (0,
+				"The requested SR steering policy could not be deleted.");
+    case -5:
+      return clib_error_return (0,
+				"The SR policy is not an encapsulation one.");
+    default:
+      return clib_error_return (0, "BUG: sr steer policy returns %d", rv);
+    }
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (sr_mpls_steer_policy_command, static) = {
+  .path = "sr mpls steer",
+  .short_help = "sr mpls steer (del) l3 <ip_addr/mask>"
+    "via sr policy bsid <mpls_label> (fib-table <fib_table_index>)",
+  .long_help =
+    "\tSteer L3 traffic through an existing SR policy.\n"
+    "\tExamples:\n"
+    "\t\tsr steer l3 2001::/64 via sr_policy index 5\n"
+    "\t\tsr steer l3 2001::/64 via sr_policy bsid 29999\n"
+    "\t\tsr steer del l3 2001::/64 via sr_policy index 5\n",
+  .function = sr_mpls_steer_policy_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+show_sr_mpls_steering_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_steering_policy_t **steer_policies = 0;
+  mpls_sr_steering_policy_t *steer_pl;
+
+  mpls_sr_policy_t *pl = 0;
+  int i;
+
+  vlib_cli_output (vm, "SR MPLS steering policies:");
+  /* *INDENT-OFF* */
+  pool_foreach (steer_pl, sm->steer_policies, ({vec_add1(steer_policies, steer_pl);}));
+  /* *INDENT-ON* */
+  vlib_cli_output (vm, "Traffic\t\tSR policy BSID");
+  for (i = 0; i < vec_len (steer_policies); i++)
+    {
+      steer_pl = steer_policies[i];
+      pl = pool_elt_at_index (sm->sr_policies, steer_pl->sr_policy);
+      if (steer_pl->classify.traffic_type == SR_STEER_IPV4)
+	{
+	  vlib_cli_output (vm, "L3 %U/%d\t%U",
+			   format_ip4_address,
+			   &steer_pl->classify.prefix.ip4,
+			   steer_pl->classify.mask_width,
+			   format_mpls_unicast_label, pl->bsid);
+	}
+      else if (steer_pl->classify.traffic_type == SR_STEER_IPV6)
+	{
+	  vlib_cli_output (vm, "L3 %U/%d\t%U",
+			   format_ip6_address,
+			   &steer_pl->classify.prefix.ip6,
+			   steer_pl->classify.mask_width,
+			   format_mpls_unicast_label, pl->bsid);
+	}
+    }
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_sr_mpls_steering_policies_command, static) = {
+  .path = "show sr mpls steering policies",
+  .short_help = "show sr mpls steering policies",
+  .function = show_sr_mpls_steering_policies_command_fn,
+};
+/* *INDENT-ON* */
+
+clib_error_t *
+sr_mpls_steering_init (vlib_main_t * vm)
+{
+  mpls_sr_main_t *sm = &sr_mpls_main;
+
+  /* Init memory for function keys */
+  mhash_init (&sm->sr_steer_policies_hash, sizeof (uword),
+	      sizeof (sr_mpls_steering_key_t));
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (sr_mpls_steering_init);
+/* *INDENT-ON* */
+
+/*
+* fd.io coding-style-patch-verification: ON
+*
+* Local Variables:
+* eval: (c-set-style "gnu")
+* End:
+*/