Merge branch 'stable/1710' of https://gerrit.fd.io/r/vpp into 17101710

13 files changed, 2982 insertions, 0 deletions

diff --git a/src/plugins/lb/api.c b/src/plugins/lb/api.c
new file mode 100644
index 00000000..9e3bcd65
--- /dev/null
+++ b/src/plugins/lb/api.c
@@ -0,0 +1,209 @@
+/*
+ * 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.
+ */
+
+#include <lb/lb.h>
+
+#include <vppinfra/byte_order.h>
+#include <vlibapi/api.h>
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vlibsocket/api.h>
+
+#define vl_msg_id(n,h) n,
+typedef enum {
+#include <lb/lb.api.h>
+    /* We'll want to know how many messages IDs we need... */
+    VL_MSG_FIRST_AVAILABLE,
+} vl_msg_id_t;
+#undef vl_msg_id
+
+
+/* define message structures */
+#define vl_typedefs
+#include <lb/lb.api.h>
+#undef vl_typedefs
+
+/* define generated endian-swappers */
+#define vl_endianfun
+#include <lb/lb.api.h>
+#undef vl_endianfun
+
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+
+/* Get the API version number */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <lb/lb.api.h>
+#undef vl_api_version
+
+#define vl_msg_name_crc_list
+#include <lb/lb.api.h>
+#undef vl_msg_name_crc_list
+
+
+#define REPLY_MSG_ID_BASE lbm->msg_id_base
+#include <vlibapi/api_helper_macros.h>
+
+static void
+setup_message_id_table (lb_main_t * lbm, api_main_t * am)
+{
+#define _(id,n,crc) \
+  vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id + lbm->msg_id_base);
+  foreach_vl_msg_name_crc_lb;
+#undef _
+}
+
+/* Macro to finish up custom dump fns */
+#define FINISH                                  \
+    vec_add1 (s, 0);                            \
+    vl_print (handle, (char *)s);               \
+    vec_free (s);                               \
+    return handle;
+
+static void
+vl_api_lb_conf_t_handler
+(vl_api_lb_conf_t * mp)
+{
+  lb_main_t *lbm = &lb_main;
+  vl_api_lb_conf_reply_t * rmp;
+  int rv = 0;
+
+  rv = lb_conf((ip4_address_t *)&mp->ip4_src_address,
+               (ip6_address_t *)mp->ip6_src_address,
+               mp->sticky_buckets_per_core,
+               mp->flow_timeout);
+
+ REPLY_MACRO (VL_API_LB_CONF_REPLY);
+}
+
+static void *vl_api_lb_conf_t_print
+(vl_api_lb_conf_t *mp, void * handle)
+{
+  u8 * s;
+  s = format (0, "SCRIPT: lb_conf ");
+  s = format (s, "%U ", format_ip4_address, (ip4_address_t *)&mp->ip4_src_address);
+  s = format (s, "%U ", format_ip6_address, (ip6_address_t *)mp->ip6_src_address);
+  s = format (s, "%u ", mp->sticky_buckets_per_core);
+  s = format (s, "%u ", mp->flow_timeout);
+  FINISH;
+}
+
+
+static void
+vl_api_lb_add_del_vip_t_handler
+(vl_api_lb_add_del_vip_t * mp)
+{
+  lb_main_t *lbm = &lb_main;
+  vl_api_lb_conf_reply_t * rmp;
+  int rv = 0;
+  ip46_address_t prefix;
+  memcpy(&prefix.ip6, mp->ip_prefix, sizeof(prefix.ip6));
+
+  if (mp->is_del) {
+    u32 vip_index;
+    if (!(rv = lb_vip_find_index(&prefix, mp->prefix_length, &vip_index)))
+      rv = lb_vip_del(vip_index);
+  } else {
+    u32 vip_index;
+    lb_vip_type_t type;
+    if (ip46_prefix_is_ip4(&prefix, mp->prefix_length)) {
+      type = mp->is_gre4?LB_VIP_TYPE_IP4_GRE4:LB_VIP_TYPE_IP4_GRE6;
+    } else {
+      type = mp->is_gre4?LB_VIP_TYPE_IP6_GRE4:LB_VIP_TYPE_IP6_GRE6;
+    }
+
+    rv = lb_vip_add(&prefix, mp->prefix_length, type,
+                    mp->new_flows_table_length, &vip_index);
+  }
+ REPLY_MACRO (VL_API_LB_CONF_REPLY);
+}
+
+static void *vl_api_lb_add_del_vip_t_print
+(vl_api_lb_add_del_vip_t *mp, void * handle)
+{
+  u8 * s;
+  s = format (0, "SCRIPT: lb_add_del_vip ");
+  s = format (s, "%U ", format_ip46_prefix,
+              (ip46_address_t *)mp->ip_prefix, mp->prefix_length, IP46_TYPE_ANY);
+  s = format (s, "%s ", mp->is_gre4?"gre4":"gre6");
+  s = format (s, "%u ", mp->new_flows_table_length);
+  s = format (s, "%s ", mp->is_del?"del":"add");
+  FINISH;
+}
+
+static void
+vl_api_lb_add_del_as_t_handler
+(vl_api_lb_add_del_as_t * mp)
+{
+  lb_main_t *lbm = &lb_main;
+  vl_api_lb_conf_reply_t * rmp;
+  int rv = 0;
+  u32 vip_index;
+  if ((rv = lb_vip_find_index((ip46_address_t *)mp->vip_ip_prefix,
+                              mp->vip_prefix_length, &vip_index)))
+    goto done;
+
+  if (mp->is_del)
+    rv = lb_vip_del_ass(vip_index, (ip46_address_t *)mp->as_address, 1);
+  else
+    rv = lb_vip_add_ass(vip_index, (ip46_address_t *)mp->as_address, 1);
+
+done:
+ REPLY_MACRO (VL_API_LB_CONF_REPLY);
+}
+
+static void *vl_api_lb_add_del_as_t_print
+(vl_api_lb_add_del_as_t *mp, void * handle)
+{
+  u8 * s;
+  s = format (0, "SCRIPT: lb_add_del_as ");
+  s = format (s, "%U ", format_ip46_prefix,
+              (ip46_address_t *)mp->vip_ip_prefix, mp->vip_prefix_length, IP46_TYPE_ANY);
+  s = format (s, "%U ", format_ip46_address,
+                (ip46_address_t *)mp->as_address, IP46_TYPE_ANY);
+  s = format (s, "%s ", mp->is_del?"del":"add");
+  FINISH;
+}
+
+/* List of message types that this plugin understands */
+#define foreach_lb_plugin_api_msg            \
+_(LB_CONF, lb_conf)                          \
+_(LB_ADD_DEL_VIP, lb_add_del_vip)            \
+_(LB_ADD_DEL_AS, lb_add_del_as)
+
+static clib_error_t * lb_api_init (vlib_main_t * vm)
+{
+  lb_main_t *lbm = &lb_main;
+  u8 *name = format (0, "lb_%08x%c", api_version, 0);
+  lbm->msg_id_base = vl_msg_api_get_msg_ids
+      ((char *) name, VL_MSG_FIRST_AVAILABLE);
+
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers((VL_API_##N + lbm->msg_id_base),     \
+                           #n,                  \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_api_##n##_t_endian,               \
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_lb_plugin_api_msg;
+#undef _
+
+  /* Add our API messages to the global name_crc hash table */
+  setup_message_id_table (lbm, &api_main);
+
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (lb_api_init);
diff --git a/src/plugins/lb/cli.c b/src/plugins/lb/cli.c
new file mode 100644
index 00000000..f6d65201
--- /dev/null
+++ b/src/plugins/lb/cli.c
@@ -0,0 +1,275 @@
+/*
+ * 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.
+ */
+
+#include <lb/lb.h>
+#include <lb/util.h>
+
+static clib_error_t *
+lb_vip_command_fn (vlib_main_t * vm,
+              unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  ip46_address_t prefix;
+  u8 plen;
+  u32 new_len = 1024;
+  u8 del = 0;
+  int ret;
+  u32 gre4 = 0;
+  lb_vip_type_t type;
+  clib_error_t *error = 0;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  if (!unformat(line_input, "%U", unformat_ip46_prefix, &prefix, &plen, IP46_TYPE_ANY)) {
+    error = clib_error_return (0, "invalid vip prefix: '%U'",
+                               format_unformat_error, line_input);
+    goto done;
+  }
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+  {
+    if (unformat(line_input, "new_len %d", &new_len))
+      ;
+    else if (unformat(line_input, "del"))
+      del = 1;
+    else if (unformat(line_input, "encap gre4"))
+      gre4 = 1;
+    else if (unformat(line_input, "encap gre6"))
+      gre4 = 0;
+    else {
+      error = clib_error_return (0, "parse error: '%U'",
+                                format_unformat_error, line_input);
+      goto done;
+    }
+  }
+
+
+  if (ip46_prefix_is_ip4(&prefix, plen)) {
+    type = (gre4)?LB_VIP_TYPE_IP4_GRE4:LB_VIP_TYPE_IP4_GRE6;
+  } else {
+    type = (gre4)?LB_VIP_TYPE_IP6_GRE4:LB_VIP_TYPE_IP6_GRE6;
+  }
+
+  lb_garbage_collection();
+
+  u32 index;
+  if (!del) {
+    if ((ret = lb_vip_add(&prefix, plen, type, new_len, &index))) {
+      error = clib_error_return (0, "lb_vip_add error %d", ret);
+      goto done;
+    } else {
+      vlib_cli_output(vm, "lb_vip_add ok %d", index);
+    }
+  } else {
+    if ((ret = lb_vip_find_index(&prefix, plen, &index))) {
+      error = clib_error_return (0, "lb_vip_find_index error %d", ret);
+      goto done;
+    } else if ((ret = lb_vip_del(index))) {
+      error = clib_error_return (0, "lb_vip_del error %d", ret);
+      goto done;
+    }
+  }
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+VLIB_CLI_COMMAND (lb_vip_command, static) =
+{
+  .path = "lb vip",
+  .short_help = "lb vip <prefix> [encap (gre6|gre4)] [new_len <n>] [del]",
+  .function = lb_vip_command_fn,
+};
+
+static clib_error_t *
+lb_as_command_fn (vlib_main_t * vm,
+              unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  ip46_address_t vip_prefix, as_addr;
+  u8 vip_plen;
+  ip46_address_t *as_array = 0;
+  u32 vip_index;
+  u8 del = 0;
+  int ret;
+  clib_error_t *error = 0;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  if (!unformat(line_input, "%U", unformat_ip46_prefix, &vip_prefix, &vip_plen, IP46_TYPE_ANY)) {
+    error = clib_error_return (0, "invalid as address: '%U'",
+                               format_unformat_error, line_input);
+    goto done;
+  }
+
+  if ((ret = lb_vip_find_index(&vip_prefix, vip_plen, &vip_index))) {
+    error = clib_error_return (0, "lb_vip_find_index error %d", ret);
+    goto done;
+  }
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+  {
+    if (unformat(line_input, "%U", unformat_ip46_address, &as_addr, IP46_TYPE_ANY)) {
+      vec_add1(as_array, as_addr);
+    } else if (unformat(line_input, "del")) {
+      del = 1;
+    } else {
+      error = clib_error_return (0, "parse error: '%U'",
+                                 format_unformat_error, line_input);
+      goto done;
+    }
+  }
+
+  if (!vec_len(as_array)) {
+    error = clib_error_return (0, "No AS address provided");
+    goto done;
+  }
+
+  lb_garbage_collection();
+  clib_warning("vip index is %d", vip_index);
+
+  if (del) {
+    if ((ret = lb_vip_del_ass(vip_index, as_array, vec_len(as_array)))) {
+      error = clib_error_return (0, "lb_vip_del_ass error %d", ret);
+      goto done;
+    }
+  } else {
+    if ((ret = lb_vip_add_ass(vip_index, as_array, vec_len(as_array)))) {
+      error = clib_error_return (0, "lb_vip_add_ass error %d", ret);
+      goto done;
+    }
+  }
+
+done:
+  unformat_free (line_input);
+  vec_free(as_array);
+
+  return error;
+}
+
+VLIB_CLI_COMMAND (lb_as_command, static) =
+{
+  .path = "lb as",
+  .short_help = "lb as <vip-prefix> [<address> [<address> [...]]] [del]",
+  .function = lb_as_command_fn,
+};
+
+static clib_error_t *
+lb_conf_command_fn (vlib_main_t * vm,
+              unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  lb_main_t *lbm = &lb_main;
+  unformat_input_t _line_input, *line_input = &_line_input;
+  ip4_address_t ip4 = lbm->ip4_src_address;
+  ip6_address_t ip6 = lbm->ip6_src_address;
+  u32 per_cpu_sticky_buckets = lbm->per_cpu_sticky_buckets;
+  u32 per_cpu_sticky_buckets_log2 = 0;
+  u32 flow_timeout = lbm->flow_timeout;
+  int ret;
+  clib_error_t *error = 0;
+
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return 0;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+  {
+    if (unformat(line_input, "ip4-src-address %U", unformat_ip4_address, &ip4))
+      ;
+    else if (unformat(line_input, "ip6-src-address %U", unformat_ip6_address, &ip6))
+      ;
+    else if (unformat(line_input, "buckets %d", &per_cpu_sticky_buckets))
+      ;
+    else if (unformat(line_input, "buckets-log2 %d", &per_cpu_sticky_buckets_log2)) {
+      if (per_cpu_sticky_buckets_log2 >= 32)
+        return clib_error_return (0, "buckets-log2 value is too high");
+      per_cpu_sticky_buckets = 1 << per_cpu_sticky_buckets_log2;
+    } else if (unformat(line_input, "timeout %d", &flow_timeout))
+      ;
+    else {
+      error = clib_error_return (0, "parse error: '%U'",
+                                 format_unformat_error, line_input);
+      goto done;
+    }
+  }
+
+  lb_garbage_collection();
+
+  if ((ret = lb_conf(&ip4, &ip6, per_cpu_sticky_buckets, flow_timeout))) {
+    error = clib_error_return (0, "lb_conf error %d", ret);
+    goto done;
+  }
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+VLIB_CLI_COMMAND (lb_conf_command, static) =
+{
+  .path = "lb conf",
+  .short_help = "lb conf [ip4-src-address <addr>] [ip6-src-address <addr>] [buckets <n>] [timeout <s>]",
+  .function = lb_conf_command_fn,
+};
+
+static clib_error_t *
+lb_show_command_fn (vlib_main_t * vm,
+              unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  vlib_cli_output(vm, "%U", format_lb_main);
+  return NULL;
+}
+
+
+VLIB_CLI_COMMAND (lb_show_command, static) =
+{
+  .path = "show lb",
+  .short_help = "show lb",
+  .function = lb_show_command_fn,
+};
+
+static clib_error_t *
+lb_show_vips_command_fn (vlib_main_t * vm,
+              unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  unformat_input_t line_input;
+  lb_main_t *lbm = &lb_main;
+  lb_vip_t *vip;
+  u8 verbose = 0;
+
+  if (!unformat_user (input, unformat_line_input, &line_input))
+      return 0;
+
+  if (unformat(&line_input, "verbose"))
+    verbose = 1;
+
+  pool_foreach(vip, lbm->vips, {
+      vlib_cli_output(vm, "%U\n", verbose?format_lb_vip_detailed:format_lb_vip, vip);
+  });
+
+  unformat_free (&line_input);
+  return NULL;
+}
+
+VLIB_CLI_COMMAND (lb_show_vips_command, static) =
+{
+  .path = "show lb vips",
+  .short_help = "show lb vips [verbose]",
+  .function = lb_show_vips_command_fn,
+};
diff --git a/src/plugins/lb/lb.api b/src/plugins/lb/lb.api
new file mode 100644
index 00000000..32cc669b
--- /dev/null
+++ b/src/plugins/lb/lb.api
@@ -0,0 +1,56 @@
+/** \brief Configure Load-Balancer global parameters
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param ip4_src_address - IPv4 address to be used as source for IPv4 GRE traffic.
+    @param ip6_src_address - IPv6 address to be used as source for IPv6 GRE traffic.
+    @param n_sticky_buckets - Number of buckets *per worker thread* in the 
+           established flow table (must be power of 2).
+    @param flow_timeout - Time in seconds after which, if no packet is received
+           for a given flow, the flow is removed from the established flow table.
+*/
+autoreply define lb_conf
+{
+  u32 client_index;
+  u32 context;
+  u32 ip4_src_address;
+  u8 ip6_src_address[16];
+  u32 sticky_buckets_per_core;
+  u32 flow_timeout;
+};
+
+/** \brief Add a virtual address (or prefix)
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param ip_prefix - IP address (IPv4 in lower order 32 bits). 
+    @param prefix_length - IP prefix length (96 + 'IPv4 prefix length' for IPv4).  
+    @param is_gre4 - Encap is ip4 GRE (ip6 GRE otherwise).
+    @param new_flows_table_length - Size of the new connections flow table used
+           for this VIP (must be power of 2).
+    @param is_del - The VIP should be removed.
+*/
+autoreply define lb_add_del_vip {
+  u32 client_index;
+  u32 context;
+  u8 ip_prefix[16];
+  u8 prefix_length;
+  u8 is_gre4;
+  u32 new_flows_table_length;
+  u8 is_del;
+};
+
+/** \brief Add an application server for a given VIP
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param vip_ip_prefix - VIP IP address (IPv4 in lower order 32 bits). 
+    @param vip_ip_prefix - VIP IP prefix length (96 + 'IPv4 prefix length' for IPv4). 
+    @param as_address - The application server address (IPv4 in lower order 32 bits).
+    @param is_del - The AS should be removed.
+*/
+autoreply define lb_add_del_as {
+  u32 client_index;
+  u32 context;
+  u8 vip_ip_prefix[16];
+  u8 vip_prefix_length;
+  u8 as_address[16];
+  u8 is_del;
+};
diff --git a/src/plugins/lb/lb.c b/src/plugins/lb/lb.c
new file mode 100644
index 00000000..cc3f8532
--- /dev/null
+++ b/src/plugins/lb/lb.c
@@ -0,0 +1,841 @@
+/*
+ * 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.
+ */
+
+#include <lb/lb.h>
+#include <vnet/plugin/plugin.h>
+#include <vpp/app/version.h>
+#include <vnet/api_errno.h>
+
+//GC runs at most once every so many seconds
+#define LB_GARBAGE_RUN 60
+
+//After so many seconds. It is assumed that inter-core race condition will not occur.
+#define LB_CONCURRENCY_TIMEOUT 10
+
+lb_main_t lb_main;
+
+#define lb_get_writer_lock() do {} while(__sync_lock_test_and_set (lb_main.writer_lock, 1))
+#define lb_put_writer_lock() lb_main.writer_lock[0] = 0
+
+static void lb_as_stack (lb_as_t *as);
+
+
+const static char * const lb_dpo_gre4_ip4[] = { "lb4-gre4" , NULL };
+const static char * const lb_dpo_gre4_ip6[] = { "lb6-gre4" , NULL };
+const static char* const * const lb_dpo_gre4_nodes[DPO_PROTO_NUM] =
+    {
+	[DPO_PROTO_IP4]  = lb_dpo_gre4_ip4,
+	[DPO_PROTO_IP6]  = lb_dpo_gre4_ip6,
+    };
+
+const static char * const lb_dpo_gre6_ip4[] = { "lb4-gre6" , NULL };
+const static char * const lb_dpo_gre6_ip6[] = { "lb6-gre6" , NULL };
+const static char* const * const lb_dpo_gre6_nodes[DPO_PROTO_NUM] =
+    {
+	[DPO_PROTO_IP4]  = lb_dpo_gre6_ip4,
+	[DPO_PROTO_IP6]  = lb_dpo_gre6_ip6,
+    };
+
+u32 lb_hash_time_now(vlib_main_t * vm)
+{
+  return (u32) (vlib_time_now(vm) + 10000);
+}
+
+u8 *format_lb_main (u8 * s, va_list * args)
+{
+  vlib_thread_main_t *tm = vlib_get_thread_main();
+  lb_main_t *lbm = &lb_main;
+  s = format(s, "lb_main");
+  s = format(s, " ip4-src-address: %U \n", format_ip4_address, &lbm->ip4_src_address);
+  s = format(s, " ip6-src-address: %U \n", format_ip6_address, &lbm->ip6_src_address);
+  s = format(s, " #vips: %u\n", pool_elts(lbm->vips));
+  s = format(s, " #ass: %u\n", pool_elts(lbm->ass) - 1);
+
+  u32 thread_index;
+  for(thread_index = 0; thread_index < tm->n_vlib_mains; thread_index++ ) {
+    lb_hash_t *h = lbm->per_cpu[thread_index].sticky_ht;
+    if (h) {
+      s = format(s, "core %d\n", thread_index);
+      s = format(s, "  timeout: %ds\n", h->timeout);
+      s = format(s, "  usage: %d / %d\n", lb_hash_elts(h, lb_hash_time_now(vlib_get_main())),  lb_hash_size(h));
+    }
+  }
+
+  return s;
+}
+
+static char *lb_vip_type_strings[] = {
+    [LB_VIP_TYPE_IP6_GRE6] = "ip6-gre6",
+    [LB_VIP_TYPE_IP6_GRE4] = "ip6-gre4",
+    [LB_VIP_TYPE_IP4_GRE6] = "ip4-gre6",
+    [LB_VIP_TYPE_IP4_GRE4] = "ip4-gre4",
+};
+
+u8 *format_lb_vip_type (u8 * s, va_list * args)
+{
+  lb_vip_type_t vipt = va_arg (*args, lb_vip_type_t);
+  u32 i;
+  for (i=0; i<LB_VIP_N_TYPES; i++)
+    if (vipt == i)
+      return format(s, lb_vip_type_strings[i]);
+  return format(s, "_WRONG_TYPE_");
+}
+
+uword unformat_lb_vip_type (unformat_input_t * input, va_list * args)
+{
+  lb_vip_type_t *vipt = va_arg (*args, lb_vip_type_t *);
+  u32 i;
+  for (i=0; i<LB_VIP_N_TYPES; i++)
+    if (unformat(input, lb_vip_type_strings[i])) {
+      *vipt = i;
+      return 1;
+    }
+  return 0;
+}
+
+u8 *format_lb_vip (u8 * s, va_list * args)
+{
+  lb_vip_t *vip = va_arg (*args, lb_vip_t *);
+  return format(s, "%U %U new_size:%u #as:%u%s",
+             format_lb_vip_type, vip->type,
+             format_ip46_prefix, &vip->prefix, vip->plen, IP46_TYPE_ANY,
+             vip->new_flow_table_mask + 1,
+             pool_elts(vip->as_indexes),
+             (vip->flags & LB_VIP_FLAGS_USED)?"":" removed");
+}
+
+u8 *format_lb_as (u8 * s, va_list * args)
+{
+  lb_as_t *as = va_arg (*args, lb_as_t *);
+  return format(s, "%U %s", format_ip46_address,
+		&as->address, IP46_TYPE_ANY,
+		(as->flags & LB_AS_FLAGS_USED)?"used":"removed");
+}
+
+u8 *format_lb_vip_detailed (u8 * s, va_list * args)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_vip_t *vip = va_arg (*args, lb_vip_t *);
+  uword indent = format_get_indent (s);
+
+  s = format(s, "%U %U [%u] %U%s\n"
+                   "%U  new_size:%u\n",
+                  format_white_space, indent,
+                  format_lb_vip_type, vip->type,
+                  vip - lbm->vips, format_ip46_prefix, &vip->prefix, vip->plen, IP46_TYPE_ANY,
+                  (vip->flags & LB_VIP_FLAGS_USED)?"":" removed",
+                  format_white_space, indent,
+                  vip->new_flow_table_mask + 1);
+
+  //Print counters
+  s = format(s, "%U  counters:\n",
+             format_white_space, indent);
+  u32 i;
+  for (i=0; i<LB_N_VIP_COUNTERS; i++)
+    s = format(s, "%U    %s: %d\n",
+               format_white_space, indent,
+               lbm->vip_counters[i].name,
+               vlib_get_simple_counter(&lbm->vip_counters[i], vip - lbm->vips));
+
+
+  s = format(s, "%U  #as:%u\n",
+             format_white_space, indent,
+             pool_elts(vip->as_indexes));
+
+  //Let's count the buckets for each AS
+  u32 *count = 0;
+  vec_validate(count, pool_len(lbm->ass)); //Possibly big alloc for not much...
+  lb_new_flow_entry_t *nfe;
+  vec_foreach(nfe, vip->new_flow_table)
+    count[nfe->as_index]++;
+
+  lb_as_t *as;
+  u32 *as_index;
+  pool_foreach(as_index, vip->as_indexes, {
+      as = &lbm->ass[*as_index];
+      s = format(s, "%U    %U %d buckets   %d flows  dpo:%u %s\n",
+                   format_white_space, indent,
+                   format_ip46_address, &as->address, IP46_TYPE_ANY,
+                   count[as - lbm->ass],
+                   vlib_refcount_get(&lbm->as_refcount, as - lbm->ass),
+                   as->dpo.dpoi_index,
+                   (as->flags & LB_AS_FLAGS_USED)?"used":" removed");
+  });
+
+  vec_free(count);
+
+  /*
+  s = format(s, "%U  new flows table:\n", format_white_space, indent);
+  lb_new_flow_entry_t *nfe;
+  vec_foreach(nfe, vip->new_flow_table) {
+    s = format(s, "%U    %d: %d\n", format_white_space, indent, nfe - vip->new_flow_table, nfe->as_index);
+  }
+  */
+  return s;
+}
+
+typedef struct {
+  u32 as_index;
+  u32 last;
+  u32 skip;
+} lb_pseudorand_t;
+
+static int lb_pseudorand_compare(void *a, void *b)
+{
+  lb_as_t *asa, *asb;
+  lb_main_t *lbm = &lb_main;
+  asa = &lbm->ass[((lb_pseudorand_t *)a)->as_index];
+  asb = &lbm->ass[((lb_pseudorand_t *)b)->as_index];
+  return memcmp(&asa->address, &asb->address, sizeof(asb->address));
+}
+
+static void lb_vip_garbage_collection(lb_vip_t *vip)
+{
+  lb_main_t *lbm = &lb_main;
+  ASSERT (lbm->writer_lock[0]);
+
+  u32 now = (u32) vlib_time_now(vlib_get_main());
+  if (!clib_u32_loop_gt(now, vip->last_garbage_collection + LB_GARBAGE_RUN))
+    return;
+
+  vip->last_garbage_collection = now;
+  lb_as_t *as;
+  u32 *as_index;
+  pool_foreach(as_index, vip->as_indexes, {
+      as = &lbm->ass[*as_index];
+      if (!(as->flags & LB_AS_FLAGS_USED) && //Not used
+	  clib_u32_loop_gt(now, as->last_used + LB_CONCURRENCY_TIMEOUT) && //Not recently used
+	  (vlib_refcount_get(&lbm->as_refcount, as - lbm->ass) == 0))
+	{ //Not referenced
+	  fib_entry_child_remove(as->next_hop_fib_entry_index,
+				 as->next_hop_child_index);
+	  fib_table_entry_delete_index(as->next_hop_fib_entry_index,
+				       FIB_SOURCE_RR);
+	  as->next_hop_fib_entry_index = FIB_NODE_INDEX_INVALID;
+
+	  pool_put(vip->as_indexes, as_index);
+	  pool_put(lbm->ass, as);
+	}
+  });
+}
+
+void lb_garbage_collection()
+{
+  lb_main_t *lbm = &lb_main;
+  lb_get_writer_lock();
+  lb_vip_t *vip;
+  u32 *to_be_removed_vips = 0, *i;
+  pool_foreach(vip, lbm->vips, {
+      lb_vip_garbage_collection(vip);
+
+      if (!(vip->flags & LB_VIP_FLAGS_USED) &&
+          (pool_elts(vip->as_indexes) == 0)) {
+        vec_add1(to_be_removed_vips, vip - lbm->vips);
+      }
+  });
+
+  vec_foreach(i, to_be_removed_vips) {
+    vip = &lbm->vips[*i];
+    pool_put(lbm->vips, vip);
+    pool_free(vip->as_indexes);
+  }
+
+  vec_free(to_be_removed_vips);
+  lb_put_writer_lock();
+}
+
+static void lb_vip_update_new_flow_table(lb_vip_t *vip)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_new_flow_entry_t *old_table;
+  u32 i, *as_index;
+  lb_new_flow_entry_t *new_flow_table = 0;
+  lb_as_t *as;
+  lb_pseudorand_t *pr, *sort_arr = 0;
+  u32 count;
+
+  ASSERT (lbm->writer_lock[0]); //We must have the lock
+
+  //Check if some AS is configured or not
+  i = 0;
+  pool_foreach(as_index, vip->as_indexes, {
+      as = &lbm->ass[*as_index];
+      if (as->flags & LB_AS_FLAGS_USED) { //Not used anymore
+        i = 1;
+        goto out; //Not sure 'break' works in this macro-loop
+      }
+  });
+
+out:
+  if (i == 0) {
+    //Only the default. i.e. no AS
+    vec_validate(new_flow_table, vip->new_flow_table_mask);
+    for (i=0; i<vec_len(new_flow_table); i++)
+      new_flow_table[i].as_index = 0;
+
+    goto finished;
+  }
+
+  //First, let's sort the ASs
+  sort_arr = 0;
+  vec_alloc(sort_arr, pool_elts(vip->as_indexes));
+
+  i = 0;
+  pool_foreach(as_index, vip->as_indexes, {
+      as = &lbm->ass[*as_index];
+      if (!(as->flags & LB_AS_FLAGS_USED)) //Not used anymore
+        continue;
+
+      sort_arr[i].as_index = as - lbm->ass;
+      i++;
+  });
+  _vec_len(sort_arr) = i;
+
+  vec_sort_with_function(sort_arr, lb_pseudorand_compare);
+
+  //Now let's pseudo-randomly generate permutations
+  vec_foreach(pr, sort_arr) {
+    lb_as_t *as = &lbm->ass[pr->as_index];
+
+    u64 seed = clib_xxhash(as->address.as_u64[0] ^
+                           as->address.as_u64[1]);
+    /* We have 2^n buckets.
+     * skip must be prime with 2^n.
+     * So skip must be odd.
+     * MagLev actually state that M should be prime,
+     * but this has a big computation cost (% operation).
+     * Using 2^n is more better (& operation).
+     */
+    pr->skip = ((seed & 0xffffffff) | 1) & vip->new_flow_table_mask;
+    pr->last = (seed >> 32) & vip->new_flow_table_mask;
+  }
+
+  //Let's create a new flow table
+  vec_validate(new_flow_table, vip->new_flow_table_mask);
+  for (i=0; i<vec_len(new_flow_table); i++)
+    new_flow_table[i].as_index = ~0;
+
+  u32 done = 0;
+  while (1) {
+    vec_foreach(pr, sort_arr) {
+      while (1) {
+        u32 last = pr->last;
+        pr->last = (pr->last + pr->skip) & vip->new_flow_table_mask;
+        if (new_flow_table[last].as_index == ~0) {
+          new_flow_table[last].as_index = pr->as_index;
+          break;
+        }
+      }
+      done++;
+      if (done == vec_len(new_flow_table))
+        goto finished;
+    }
+  }
+
+  vec_free(sort_arr);
+
+finished:
+
+//Count number of changed entries
+  count = 0;
+  for (i=0; i<vec_len(new_flow_table); i++)
+    if (vip->new_flow_table == 0 ||
+        new_flow_table[i].as_index != vip->new_flow_table[i].as_index)
+      count++;
+
+  old_table = vip->new_flow_table;
+  vip->new_flow_table = new_flow_table;
+  vec_free(old_table);
+}
+
+int lb_conf(ip4_address_t *ip4_address, ip6_address_t *ip6_address,
+           u32 per_cpu_sticky_buckets, u32 flow_timeout)
+{
+  lb_main_t *lbm = &lb_main;
+
+  if (!is_pow2(per_cpu_sticky_buckets))
+    return VNET_API_ERROR_INVALID_MEMORY_SIZE;
+
+  lb_get_writer_lock(); //Not exactly necessary but just a reminder that it exists for my future self
+  lbm->ip4_src_address = *ip4_address;
+  lbm->ip6_src_address = *ip6_address;
+  lbm->per_cpu_sticky_buckets = per_cpu_sticky_buckets;
+  lbm->flow_timeout = flow_timeout;
+  lb_put_writer_lock();
+  return 0;
+}
+
+static
+int lb_vip_find_index_with_lock(ip46_address_t *prefix, u8 plen, u32 *vip_index)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_vip_t *vip;
+  ASSERT (lbm->writer_lock[0]); //This must be called with the lock owned
+  ip46_prefix_normalize(prefix, plen);
+  pool_foreach(vip, lbm->vips, {
+      if ((vip->flags & LB_AS_FLAGS_USED) &&
+          vip->plen == plen &&
+          vip->prefix.as_u64[0] == prefix->as_u64[0] &&
+          vip->prefix.as_u64[1] == prefix->as_u64[1]) {
+        *vip_index = vip - lbm->vips;
+        return 0;
+      }
+  });
+  return VNET_API_ERROR_NO_SUCH_ENTRY;
+}
+
+int lb_vip_find_index(ip46_address_t *prefix, u8 plen, u32 *vip_index)
+{
+  int ret;
+  lb_get_writer_lock();
+  ret = lb_vip_find_index_with_lock(prefix, plen, vip_index);
+  lb_put_writer_lock();
+  return ret;
+}
+
+static int lb_as_find_index_vip(lb_vip_t *vip, ip46_address_t *address, u32 *as_index)
+{
+  lb_main_t *lbm = &lb_main;
+  ASSERT (lbm->writer_lock[0]); //This must be called with the lock owned
+  lb_as_t *as;
+  u32 *asi;
+  pool_foreach(asi, vip->as_indexes, {
+      as = &lbm->ass[*asi];
+      if (as->vip_index == (vip - lbm->vips) &&
+          as->address.as_u64[0] == address->as_u64[0] &&
+          as->address.as_u64[1] == address->as_u64[1]) {
+        *as_index = as - lbm->ass;
+        return 0;
+      }
+  });
+  return -1;
+}
+
+int lb_vip_add_ass(u32 vip_index, ip46_address_t *addresses, u32 n)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_get_writer_lock();
+  lb_vip_t *vip;
+  if (!(vip = lb_vip_get_by_index(vip_index))) {
+    lb_put_writer_lock();
+    return VNET_API_ERROR_NO_SUCH_ENTRY;
+  }
+
+  ip46_type_t type = lb_vip_is_gre4(vip)?IP46_TYPE_IP4:IP46_TYPE_IP6;
+  u32 *to_be_added = 0;
+  u32 *to_be_updated = 0;
+  u32 i;
+  u32 *ip;
+
+  //Sanity check
+  while (n--) {
+
+    if (!lb_as_find_index_vip(vip, &addresses[n], &i)) {
+      if (lbm->ass[i].flags & LB_AS_FLAGS_USED) {
+        vec_free(to_be_added);
+        vec_free(to_be_updated);
+        lb_put_writer_lock();
+        return VNET_API_ERROR_VALUE_EXIST;
+      }
+      vec_add1(to_be_updated, i);
+      goto next;
+    }
+
+    if (ip46_address_type(&addresses[n]) != type) {
+      vec_free(to_be_added);
+      vec_free(to_be_updated);
+      lb_put_writer_lock();
+      return VNET_API_ERROR_INVALID_ADDRESS_FAMILY;
+    }
+
+    if (n) {
+      u32 n2 = n;
+      while(n2--) //Check for duplicates
+        if (addresses[n2].as_u64[0] == addresses[n].as_u64[0] &&
+            addresses[n2].as_u64[1] == addresses[n].as_u64[1])
+          goto next;
+    }
+
+    vec_add1(to_be_added, n);
+
+next:
+    continue;
+  }
+
+  //Update reused ASs
+  vec_foreach(ip, to_be_updated) {
+    lbm->ass[*ip].flags = LB_AS_FLAGS_USED;
+  }
+  vec_free(to_be_updated);
+
+  //Create those who have to be created
+  vec_foreach(ip, to_be_added) {
+    lb_as_t *as;
+    u32 *as_index;
+    pool_get(lbm->ass, as);
+    as->address = addresses[*ip];
+    as->flags = LB_AS_FLAGS_USED;
+    as->vip_index = vip_index;
+    pool_get(vip->as_indexes, as_index);
+    *as_index = as - lbm->ass;
+
+    /*
+     * become a child of the FIB entry
+     * so we are informed when its forwarding changes
+     */
+    fib_prefix_t nh = {};
+    if (lb_vip_is_gre4(vip)) {
+	nh.fp_addr.ip4 = as->address.ip4;
+	nh.fp_len = 32;
+	nh.fp_proto = FIB_PROTOCOL_IP4;
+    } else {
+	nh.fp_addr.ip6 = as->address.ip6;
+	nh.fp_len = 128;
+	nh.fp_proto = FIB_PROTOCOL_IP6;
+    }
+
+    as->next_hop_fib_entry_index =
+	fib_table_entry_special_add(0,
+				    &nh,
+				    FIB_SOURCE_RR,
+				    FIB_ENTRY_FLAG_NONE);
+    as->next_hop_child_index =
+	fib_entry_child_add(as->next_hop_fib_entry_index,
+			    lbm->fib_node_type,
+			    as - lbm->ass);
+
+    lb_as_stack(as);
+  }
+  vec_free(to_be_added);
+
+  //Recompute flows
+  lb_vip_update_new_flow_table(vip);
+
+  //Garbage collection maybe
+  lb_vip_garbage_collection(vip);
+
+  lb_put_writer_lock();
+  return 0;
+}
+
+int lb_vip_del_ass_withlock(u32 vip_index, ip46_address_t *addresses, u32 n)
+{
+  lb_main_t *lbm = &lb_main;
+  u32 now = (u32) vlib_time_now(vlib_get_main());
+  u32 *ip = 0;
+
+  lb_vip_t *vip;
+  if (!(vip = lb_vip_get_by_index(vip_index))) {
+    return VNET_API_ERROR_NO_SUCH_ENTRY;
+  }
+
+  u32 *indexes = NULL;
+  while (n--) {
+    u32 i;
+    if (lb_as_find_index_vip(vip, &addresses[n], &i)) {
+      vec_free(indexes);
+      return VNET_API_ERROR_NO_SUCH_ENTRY;
+    }
+
+    if (n) { //Check for duplicates
+      u32 n2 = n - 1;
+      while(n2--) {
+        if (addresses[n2].as_u64[0] == addresses[n].as_u64[0] &&
+            addresses[n2].as_u64[1] == addresses[n].as_u64[1])
+          goto next;
+      }
+    }
+
+    vec_add1(indexes, i);
+next:
+  continue;
+  }
+
+  //Garbage collection maybe
+  lb_vip_garbage_collection(vip);
+
+  if (indexes != NULL) {
+    vec_foreach(ip, indexes) {
+      lbm->ass[*ip].flags &= ~LB_AS_FLAGS_USED;
+      lbm->ass[*ip].last_used = now;
+    }
+
+    //Recompute flows
+    lb_vip_update_new_flow_table(vip);
+  }
+
+  vec_free(indexes);
+  return 0;
+}
+
+int lb_vip_del_ass(u32 vip_index, ip46_address_t *addresses, u32 n)
+{
+  lb_get_writer_lock();
+  int ret = lb_vip_del_ass_withlock(vip_index, addresses, n);
+  lb_put_writer_lock();
+  return ret;
+}
+
+/**
+ * Add the VIP adjacency to the ip4 or ip6 fib
+ */
+static void lb_vip_add_adjacency(lb_main_t *lbm, lb_vip_t *vip)
+{
+  dpo_proto_t proto = 0;
+  dpo_id_t dpo = DPO_INVALID;
+  fib_prefix_t pfx = {};
+  if (lb_vip_is_ip4(vip)) {
+      pfx.fp_addr.ip4 = vip->prefix.ip4;
+      pfx.fp_len = vip->plen - 96;
+      pfx.fp_proto = FIB_PROTOCOL_IP4;
+      proto = DPO_PROTO_IP4;
+  } else {
+      pfx.fp_addr.ip6 = vip->prefix.ip6;
+      pfx.fp_len = vip->plen;
+      pfx.fp_proto = FIB_PROTOCOL_IP6;
+      proto = DPO_PROTO_IP6;
+  }
+  dpo_set(&dpo, lb_vip_is_gre4(vip)?lbm->dpo_gre4_type:lbm->dpo_gre6_type,
+      proto, vip - lbm->vips);
+  fib_table_entry_special_dpo_add(0,
+				  &pfx,
+				  FIB_SOURCE_PLUGIN_HI,
+				  FIB_ENTRY_FLAG_EXCLUSIVE,
+				  &dpo);
+  dpo_reset(&dpo);
+}
+
+/**
+ * Deletes the adjacency associated with the VIP
+ */
+static void lb_vip_del_adjacency(lb_main_t *lbm, lb_vip_t *vip)
+{
+  fib_prefix_t pfx = {};
+  if (lb_vip_is_ip4(vip)) {
+      pfx.fp_addr.ip4 = vip->prefix.ip4;
+      pfx.fp_len = vip->plen - 96;
+      pfx.fp_proto = FIB_PROTOCOL_IP4;
+  } else {
+      pfx.fp_addr.ip6 = vip->prefix.ip6;
+      pfx.fp_len = vip->plen;
+      pfx.fp_proto = FIB_PROTOCOL_IP6;
+  }
+  fib_table_entry_special_remove(0, &pfx, FIB_SOURCE_PLUGIN_HI);
+}
+
+int lb_vip_add(ip46_address_t *prefix, u8 plen, lb_vip_type_t type, u32 new_length, u32 *vip_index)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_vip_t *vip;
+  lb_get_writer_lock();
+  ip46_prefix_normalize(prefix, plen);
+
+  if (!lb_vip_find_index_with_lock(prefix, plen, vip_index)) {
+    lb_put_writer_lock();
+    return VNET_API_ERROR_VALUE_EXIST;
+  }
+
+  if (!is_pow2(new_length)) {
+    lb_put_writer_lock();
+    return VNET_API_ERROR_INVALID_MEMORY_SIZE;
+  }
+
+  if (ip46_prefix_is_ip4(prefix, plen) &&
+      (type != LB_VIP_TYPE_IP4_GRE4) &&
+      (type != LB_VIP_TYPE_IP4_GRE6))
+    return VNET_API_ERROR_INVALID_ADDRESS_FAMILY;
+
+
+  //Allocate
+  pool_get(lbm->vips, vip);
+
+  //Init
+  vip->prefix = *prefix;
+  vip->plen = plen;
+  vip->last_garbage_collection = (u32) vlib_time_now(vlib_get_main());
+  vip->type = type;
+  vip->flags = LB_VIP_FLAGS_USED;
+  vip->as_indexes = 0;
+
+  //Validate counters
+  u32 i;
+  for (i = 0; i < LB_N_VIP_COUNTERS; i++) {
+    vlib_validate_simple_counter(&lbm->vip_counters[i], vip - lbm->vips);
+    vlib_zero_simple_counter(&lbm->vip_counters[i], vip - lbm->vips);
+  }
+
+  //Configure new flow table
+  vip->new_flow_table_mask = new_length - 1;
+  vip->new_flow_table = 0;
+
+  //Create a new flow hash table full of the default entry
+  lb_vip_update_new_flow_table(vip);
+
+  //Create adjacency to direct traffic
+  lb_vip_add_adjacency(lbm, vip);
+
+  //Return result
+  *vip_index = vip - lbm->vips;
+
+  lb_put_writer_lock();
+  return 0;
+}
+
+int lb_vip_del(u32 vip_index)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_vip_t *vip;
+  lb_get_writer_lock();
+  if (!(vip = lb_vip_get_by_index(vip_index))) {
+    lb_put_writer_lock();
+    return VNET_API_ERROR_NO_SUCH_ENTRY;
+  }
+
+  //FIXME: This operation is actually not working
+  //We will need to remove state before performing this.
+
+  {
+    //Remove all ASs
+    ip46_address_t *ass = 0;
+    lb_as_t *as;
+    u32 *as_index;
+    pool_foreach(as_index, vip->as_indexes, {
+        as = &lbm->ass[*as_index];
+        vec_add1(ass, as->address);
+    });
+    if (vec_len(ass))
+      lb_vip_del_ass_withlock(vip_index, ass, vec_len(ass));
+    vec_free(ass);
+  }
+
+  //Delete adjacency
+  lb_vip_del_adjacency(lbm, vip);
+
+  //Set the VIP as unused
+  vip->flags &= ~LB_VIP_FLAGS_USED;
+
+  lb_put_writer_lock();
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () = {
+    .version = VPP_BUILD_VER,
+    .description = "Load Balancer",
+};
+/* *INDENT-ON* */
+
+u8 *format_lb_dpo (u8 * s, va_list * va)
+{
+  index_t index = va_arg (*va, index_t);
+  CLIB_UNUSED(u32 indent) = va_arg (*va, u32);
+  lb_main_t *lbm = &lb_main;
+  lb_vip_t *vip = pool_elt_at_index (lbm->vips, index);
+  return format (s, "%U", format_lb_vip, vip);
+}
+
+static void lb_dpo_lock (dpo_id_t *dpo) {}
+static void lb_dpo_unlock (dpo_id_t *dpo) {}
+
+static fib_node_t *
+lb_fib_node_get_node (fib_node_index_t index)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_as_t *as = pool_elt_at_index (lbm->ass, index);
+  return (&as->fib_node);
+}
+
+static void
+lb_fib_node_last_lock_gone (fib_node_t *node)
+{
+}
+
+static lb_as_t *
+lb_as_from_fib_node (fib_node_t *node)
+{
+  return ((lb_as_t*)(((char*)node) -
+      STRUCT_OFFSET_OF(lb_as_t, fib_node)));
+}
+
+static void
+lb_as_stack (lb_as_t *as)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_vip_t *vip = &lbm->vips[as->vip_index];
+  dpo_stack(lb_vip_is_gre4(vip)?lbm->dpo_gre4_type:lbm->dpo_gre6_type,
+	    lb_vip_is_ip4(vip)?DPO_PROTO_IP4:DPO_PROTO_IP6,
+	    &as->dpo,
+	    fib_entry_contribute_ip_forwarding(
+		as->next_hop_fib_entry_index));
+}
+
+static fib_node_back_walk_rc_t
+lb_fib_node_back_walk_notify (fib_node_t *node,
+			       fib_node_back_walk_ctx_t *ctx)
+{
+    lb_as_stack(lb_as_from_fib_node(node));
+    return (FIB_NODE_BACK_WALK_CONTINUE);
+}
+
+clib_error_t *
+lb_init (vlib_main_t * vm)
+{
+  vlib_thread_main_t *tm = vlib_get_thread_main ();
+  lb_main_t *lbm = &lb_main;
+  lb_as_t *default_as;
+  fib_node_vft_t lb_fib_node_vft = {
+      .fnv_get = lb_fib_node_get_node,
+      .fnv_last_lock = lb_fib_node_last_lock_gone,
+      .fnv_back_walk = lb_fib_node_back_walk_notify,
+  };
+  dpo_vft_t lb_vft = {
+      .dv_lock = lb_dpo_lock,
+      .dv_unlock = lb_dpo_unlock,
+      .dv_format = format_lb_dpo,
+  };
+
+  lbm->vips = 0;
+  lbm->per_cpu = 0;
+  vec_validate(lbm->per_cpu, tm->n_vlib_mains - 1);
+  lbm->writer_lock = clib_mem_alloc_aligned (CLIB_CACHE_LINE_BYTES,  CLIB_CACHE_LINE_BYTES);
+  lbm->writer_lock[0] = 0;
+  lbm->per_cpu_sticky_buckets = LB_DEFAULT_PER_CPU_STICKY_BUCKETS;
+  lbm->flow_timeout = LB_DEFAULT_FLOW_TIMEOUT;
+  lbm->ip4_src_address.as_u32 = 0xffffffff;
+  lbm->ip6_src_address.as_u64[0] = 0xffffffffffffffffL;
+  lbm->ip6_src_address.as_u64[1] = 0xffffffffffffffffL;
+  lbm->dpo_gre4_type = dpo_register_new_type(&lb_vft, lb_dpo_gre4_nodes);
+  lbm->dpo_gre6_type = dpo_register_new_type(&lb_vft, lb_dpo_gre6_nodes);
+  lbm->fib_node_type = fib_node_register_new_type(&lb_fib_node_vft);
+
+  //Init AS reference counters
+  vlib_refcount_init(&lbm->as_refcount);
+
+  //Allocate and init default AS.
+  lbm->ass = 0;
+  pool_get(lbm->ass, default_as);
+  default_as->flags = 0;
+  default_as->dpo.dpoi_next_node = LB_NEXT_DROP;
+  default_as->vip_index = ~0;
+  default_as->address.ip6.as_u64[0] = 0xffffffffffffffffL;
+  default_as->address.ip6.as_u64[1] = 0xffffffffffffffffL;
+
+#define _(a,b,c) lbm->vip_counters[c].name = b;
+  lb_foreach_vip_counter
+#undef _
+  return NULL;
+}
+
+VLIB_INIT_FUNCTION (lb_init);
diff --git a/src/plugins/lb/lb.h b/src/plugins/lb/lb.h
new file mode 100644
index 00000000..882b9b30
--- /dev/null
+++ b/src/plugins/lb/lb.h
@@ -0,0 +1,333 @@
+/*
+ * 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.
+ */
+
+/**
+ * lb-plugin implements a MagLev-like load balancer.
+ * http://research.google.com/pubs/pub44824.html
+ *
+ * It hasn't been tested for interoperability with the original MagLev
+ * but intends to provide similar functionality.
+ * The load-balancer receives traffic destined to VIP (Virtual IP)
+ * addresses from one or multiple(ECMP) routers.
+ * The load-balancer tunnels the traffic toward many application servers
+ * ensuring session stickyness (i.e. that a single sessions is tunneled
+ * towards a single application server).
+ *
+ */
+
+#ifndef LB_PLUGIN_LB_LB_H_
+#define LB_PLUGIN_LB_LB_H_
+
+#include <lb/util.h>
+#include <lb/refcount.h>
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/dpo/dpo.h>
+#include <vnet/fib/fib_table.h>
+
+#include <lb/lbhash.h>
+
+#define LB_DEFAULT_PER_CPU_STICKY_BUCKETS 1 << 10
+#define LB_DEFAULT_FLOW_TIMEOUT 40
+
+typedef enum {
+  LB_NEXT_DROP,
+  LB_N_NEXT,
+} lb_next_t;
+
+/**
+ * Each VIP is configured with a set of
+ * application server.
+ */
+typedef struct {
+  /**
+   * Registration to FIB event.
+   */
+  fib_node_t fib_node;
+
+  /**
+   * Destination address used to tunnel traffic towards
+   * that application server.
+   * The address is also used as ID and pseudo-random
+   * seed for the load-balancing process.
+   */
+  ip46_address_t address;
+
+  /**
+   * ASs are indexed by address and VIP Index.
+   * Which means there will be duplicated if the same server
+   * address is used for multiple VIPs.
+   */
+  u32 vip_index;
+
+  /**
+   * Some per-AS flags.
+   * For now only LB_AS_FLAGS_USED is defined.
+   */
+  u8 flags;
+
+#define LB_AS_FLAGS_USED 0x1
+
+  /**
+   * Rotating timestamp of when LB_AS_FLAGS_USED flag was last set.
+   *
+   * AS removal is based on garbage collection and reference counting.
+   * When an AS is removed, there is a race between configuration core
+   * and worker cores which may still add a reference while it should not
+   * be used. This timestamp is used to not remove the AS while a race condition
+   * may happen.
+   */
+  u32 last_used;
+
+  /**
+   * The FIB entry index for the next-hop
+   */
+  fib_node_index_t next_hop_fib_entry_index;
+
+  /**
+   * The child index on the FIB entry
+   */
+  u32 next_hop_child_index;
+
+  /**
+   * The next DPO in the graph to follow.
+   */
+  dpo_id_t dpo;
+
+} lb_as_t;
+
+format_function_t format_lb_as;
+
+typedef struct {
+  u32 as_index;
+} lb_new_flow_entry_t;
+
+#define lb_foreach_vip_counter \
+ _(NEXT_PACKET, "packet from existing sessions", 0) \
+ _(FIRST_PACKET, "first session packet", 1) \
+ _(UNTRACKED_PACKET, "untracked packet", 2) \
+ _(NO_SERVER, "no server configured", 3)
+
+typedef enum {
+#define _(a,b,c) LB_VIP_COUNTER_##a = c,
+  lb_foreach_vip_counter
+#undef _
+  LB_N_VIP_COUNTERS
+} lb_vip_counter_t;
+
+/**
+ * The load balancer supports IPv4 and IPv6 traffic
+ * and GRE4 and GRE6 encap.
+ */
+typedef enum {
+  LB_VIP_TYPE_IP6_GRE6,
+  LB_VIP_TYPE_IP6_GRE4,
+  LB_VIP_TYPE_IP4_GRE6,
+  LB_VIP_TYPE_IP4_GRE4,
+  LB_VIP_N_TYPES,
+} lb_vip_type_t;
+
+format_function_t format_lb_vip_type;
+unformat_function_t unformat_lb_vip_type;
+
+/**
+ * Load balancing service is provided per VIP.
+ * In this data model, a VIP can be a whole prefix.
+ * But load balancing only
+ * occurs on a per-source-address/port basis. Meaning that if a given source
+ * reuses the same port for multiple destinations within the same VIP,
+ * they will be considered as a single flow.
+ */
+typedef struct {
+
+  //Runtime
+
+  /**
+   * Vector mapping (flow-hash & new_connect_table_mask) to AS index.
+   * This is used for new flows.
+   */
+  lb_new_flow_entry_t *new_flow_table;
+
+  /**
+   * New flows table length - 1
+   * (length MUST be a power of 2)
+   */
+  u32 new_flow_table_mask;
+
+  /**
+   * Last time garbage collection was run to free the ASs.
+   */
+  u32 last_garbage_collection;
+
+  //Not runtime
+
+  /**
+   * A Virtual IP represents a given service delivered
+   * by a set of application servers. It can be a single
+   * address or a prefix.
+   * IPv4 prefixes are encoded using IPv4-in-IPv6 embedded address
+   * (i.e. ::/96 prefix).
+   */
+  ip46_address_t prefix;
+
+  /**
+   * The VIP prefix length.
+   * In case of IPv4, plen = 96 + ip4_plen.
+   */
+  u8 plen;
+
+  /**
+   * The type of traffic for this.
+   * LB_TYPE_UNDEFINED if unknown.
+   */
+  lb_vip_type_t type;
+
+  /**
+   * Flags related to this VIP.
+   * LB_VIP_FLAGS_USED means the VIP is active.
+   * When it is not set, the VIP in the process of being removed.
+   * We cannot immediately remove a VIP because the VIP index still may be stored
+   * in the adjacency index.
+   */
+  u8 flags;
+#define LB_VIP_FLAGS_USED 0x1
+
+  /**
+   * Pool of AS indexes used for this VIP.
+   * This also includes ASs that have been removed (but are still referenced).
+   */
+  u32 *as_indexes;
+} lb_vip_t;
+
+#define lb_vip_is_ip4(vip) ((vip)->type == LB_VIP_TYPE_IP4_GRE6 || (vip)->type == LB_VIP_TYPE_IP4_GRE4)
+#define lb_vip_is_gre4(vip) ((vip)->type == LB_VIP_TYPE_IP6_GRE4 || (vip)->type == LB_VIP_TYPE_IP4_GRE4)
+format_function_t format_lb_vip;
+format_function_t format_lb_vip_detailed;
+
+typedef struct {
+  /**
+   * Each CPU has its own sticky flow hash table.
+   * One single table is used for all VIPs.
+   */
+  lb_hash_t *sticky_ht;
+} lb_per_cpu_t;
+
+typedef struct {
+  /**
+   * Pool of all Virtual IPs
+   */
+  lb_vip_t *vips;
+
+  /**
+   * Pool of ASs.
+   * ASs are referenced by address and vip index.
+   * The first element (index 0) is special and used only to fill
+   * new_flow_tables when no AS has been configured.
+   */
+  lb_as_t *ass;
+
+  /**
+   * Each AS has an associated reference counter.
+   * As ass[0] has a special meaning, its associated counter
+   * starts at 0 and is decremented instead. i.e. do not use it.
+   */
+  vlib_refcount_t as_refcount;
+
+  /**
+   * Some global data is per-cpu
+   */
+  lb_per_cpu_t *per_cpu;
+
+  /**
+   * Node next index for IP adjacencies, for each of the traffic types.
+   */
+  u32 ip_lookup_next_index[LB_VIP_N_TYPES];
+
+  /**
+   * Source address used in IPv6 encapsulated traffic
+   */
+  ip6_address_t ip6_src_address;
+
+  /**
+   * Source address used for IPv4 encapsulated traffic
+   */
+  ip4_address_t ip4_src_address;
+
+  /**
+   * Number of buckets in the per-cpu sticky hash table.
+   */
+  u32 per_cpu_sticky_buckets;
+
+  /**
+   * Flow timeout in seconds.
+   */
+  u32 flow_timeout;
+
+  /**
+   * Per VIP counter
+   */
+  vlib_simple_counter_main_t vip_counters[LB_N_VIP_COUNTERS];
+
+  /**
+   * DPO used to send packet from IP4/6 lookup to LB node.
+   */
+  dpo_type_t dpo_gre4_type;
+  dpo_type_t dpo_gre6_type;
+
+  /**
+   * Node type for registering to fib changes.
+   */
+  fib_node_type_t fib_node_type;
+
+  /**
+   * API dynamically registered base ID.
+   */
+  u16 msg_id_base;
+
+  volatile u32 *writer_lock;
+} lb_main_t;
+
+extern lb_main_t lb_main;
+extern vlib_node_registration_t lb6_node;
+extern vlib_node_registration_t lb4_node;
+
+/**
+ * Fix global load-balancer parameters.
+ * @param ip4_address IPv4 source address used for encapsulated traffic
+ * @param ip6_address IPv6 source address used for encapsulated traffic
+ * @return 0 on success. VNET_LB_ERR_XXX on error
+ */
+int lb_conf(ip4_address_t *ip4_address, ip6_address_t *ip6_address,
+            u32 sticky_buckets, u32 flow_timeout);
+
+int lb_vip_add(ip46_address_t *prefix, u8 plen, lb_vip_type_t type,
+               u32 new_length, u32 *vip_index);
+int lb_vip_del(u32 vip_index);
+
+int lb_vip_find_index(ip46_address_t *prefix, u8 plen, u32 *vip_index);
+
+#define lb_vip_get_by_index(index) (pool_is_free_index(lb_main.vips, index)?NULL:pool_elt_at_index(lb_main.vips, index))
+
+int lb_vip_add_ass(u32 vip_index, ip46_address_t *addresses, u32 n);
+int lb_vip_del_ass(u32 vip_index, ip46_address_t *addresses, u32 n);
+
+u32 lb_hash_time_now(vlib_main_t * vm);
+
+void lb_garbage_collection();
+
+format_function_t format_lb_main;
+
+#endif /* LB_PLUGIN_LB_LB_H_ */
diff --git a/src/plugins/lb/lb_plugin_doc.md b/src/plugins/lb/lb_plugin_doc.md
new file mode 100644
index 00000000..c7885ffb
--- /dev/null
+++ b/src/plugins/lb/lb_plugin_doc.md
@@ -0,0 +1,141 @@
+# Load Balancer plugin for VPP    {#lb_plugin_doc}
+
+## Version
+
+The load balancer plugin is currently in *beta* version.
+Both CLIs and APIs are subject to *heavy* changes.
+Wich also means feedback is really welcome regarding features, apis, etc...
+
+## Overview
+
+This plugin provides load balancing for VPP in a way that is largely inspired 
+from Google's MagLev: http://research.google.com/pubs/pub44824.html
+
+The load balancer is configured with a set of Virtual IPs (VIP, which can be 
+prefixes), and for each VIP, with a set of Application Server addresses (ASs).
+
+Traffic received for a given VIP (or VIP prefix) is tunneled using GRE towards
+the different ASs in a way that (tries to) ensure that a given session will 
+always be tunneled to the same AS.
+
+Both VIPs or ASs can be IPv4 or IPv6, but for a given VIP, all ASs must be using
+the same encap. type (i.e. IPv4+GRE or IPv6+GRE). Meaning that for a given VIP,
+all AS addresses must be of the same family.
+
+## Performances
+
+The load balancer has been tested up to 1 millions flows and still forwards more
+than 3Mpps per core in such circumstances.
+Although 3Mpps seems already good, it is likely that performances will be improved
+in next versions.
+
+## Configuration
+
+### Global LB parameters
+
+The load balancer needs to be configured with some parameters:
+
+	lb conf [ip4-src-address <addr>] [ip6-src-address <addr>] 
+	        [buckets <n>] [timeout <s>]
+	       
+ip4-src-address: the source address used to send encap. packets using IPv4.
+
+ip6-src-address: the source address used to send encap. packets using IPv6.
+
+buckets:         the *per-thread* established-connexions-table number of buckets.
+
+timeout:         the number of seconds a connection will remain in the 
+                 established-connexions-table while no packet for this flow
+                 is received.
+                 
+
+### Configure the VIPs
+
+    lb vip <prefix> [encap (gre6|gre4)] [new_len <n>] [del]
+    
+new_len is the size of the new-connection-table. It should be 1 or 2 orders of
+magnitude bigger than the number of ASs for the VIP in order to ensure a good
+load balancing.
+
+Examples:
+    
+    lb vip 2002::/16 encap gre6 new_len 1024
+    lb vip 2003::/16 encap gre4 new_len 2048
+    lb vip 80.0.0.0/8 encap gre6 new_len 16
+    lb vip 90.0.0.0/8 encap gre4 new_len 1024
+
+### Configure the ASs (for each VIP)
+
+    lb as <vip-prefix> [<address> [<address> [...]]] [del]
+
+You can add (or delete) as many ASs at a time (for a single VIP).
+Note that the AS address family must correspond to the VIP encap. IP family.
+
+Examples:
+
+    lb as 2002::/16 2001::2 2001::3 2001::4
+    lb as 2003::/16 10.0.0.1 10.0.0.2
+    lb as 80.0.0.0/8 2001::2
+    lb as 90.0.0.0/8 10.0.0.1
+    
+    
+
+## Monitoring
+
+The plugin provides quite a bunch of counters and information.
+These are still subject to quite significant changes.
+
+    show lb
+    show lb vip
+    show lb vip verbose
+    
+    show node counters
+
+
+## Design notes
+
+### Multi-Threading
+
+MagLev is a distributed system which pseudo-randomly generates a 
+new-connections-table based on AS names such that each server configured with 
+the same set of ASs ends up with the same table. Connection stickyness is then 
+ensured with an established-connections-table. Using ECMP, it is assumed (but
+not relied on) that servers will mostly receive traffic for different flows.
+
+This implementation pushes the parallelism a little bit further by using
+one established-connections table per thread. This is equivalent to assuming
+that RSS will make a job similar to ECMP, and is pretty useful as threads don't
+need to get a lock in order to write in the table.
+
+### Hash Table
+
+A load balancer requires an efficient read and write hash table. The hash table
+used by ip6-forward is very read-efficient, but not so much for writing. In
+addition, it is not a big deal if writing into the hash table fails (again,
+MagLev uses a flow table but does not heaviliy relies on it).
+
+The plugin therefore uses a very specific (and stupid) hash table.
+	- Fixed (and power of 2) number of buckets (configured at runtime)
+	- Fixed (and power of 2) elements per buckets (configured at compilation time)
+
+### Reference counting
+
+When an AS is removed, there is two possible ways to react.
+	- Keep using the AS for established connections
+	- Change AS for established connections (likely to cause error for TCP)
+
+In the first case, although an AS is removed from the configuration, its 
+associated state needs to stay around as long as it is used by at least one 
+thread.
+
+In order to avoid locks, a specific reference counter is used. The design is quite
+similar to clib counters but:
+	- It is possible to decrease the value
+	- Summing will not zero the per-thread counters
+	- Only the thread can reallocate its own counters vector (to avoid concurrency issues)
+
+This reference counter is lock free, but reading a count of 0 does not mean
+the value can be freed unless it is ensured by *other* means that no other thread
+is concurrently referencing the object. In the case of this plugin, it is assumed
+that no concurrent event will take place after a few seconds.
+
diff --git a/src/plugins/lb/lb_test.c b/src/plugins/lb/lb_test.c
new file mode 100644
index 00000000..9b30c18d
--- /dev/null
+++ b/src/plugins/lb/lb_test.c
@@ -0,0 +1,270 @@
+/*
+ * 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.
+ */
+
+#include <vat/vat.h>
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vlibsocket/api.h>
+#include <vppinfra/error.h>
+#include <lb/lb.h>
+
+#define __plugin_msg_base lb_test_main.msg_id_base
+#include <vlibapi/vat_helper_macros.h>
+
+//TODO: Move that to vat/plugin_api.c
+//////////////////////////
+uword unformat_ip46_address (unformat_input_t * input, va_list * args)
+{
+  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
+  ip46_type_t type = va_arg (*args, ip46_type_t);
+  if ((type != IP46_TYPE_IP6) &&
+      unformat(input, "%U", unformat_ip4_address, &ip46->ip4)) {
+    ip46_address_mask_ip4(ip46);
+    return 1;
+  } else if ((type != IP46_TYPE_IP4) &&
+      unformat(input, "%U", unformat_ip6_address, &ip46->ip6)) {
+    return 1;
+  }
+  return 0;
+}
+uword unformat_ip46_prefix (unformat_input_t * input, va_list * args)
+{
+  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
+  u8 *len = va_arg (*args, u8 *);
+  ip46_type_t type = va_arg (*args, ip46_type_t);
+
+  u32 l;
+  if ((type != IP46_TYPE_IP6) && unformat(input, "%U/%u", unformat_ip4_address, &ip46->ip4, &l)) {
+    if (l > 32)
+      return 0;
+    *len = l + 96;
+    ip46->pad[0] = ip46->pad[1] = ip46->pad[2] = 0;
+  } else if ((type != IP46_TYPE_IP4) && unformat(input, "%U/%u", unformat_ip6_address, &ip46->ip6, &l)) {
+    if (l > 128)
+      return 0;
+    *len = l;
+  } else {
+    return 0;
+  }
+  return 1;
+}
+/////////////////////////
+
+#define vl_msg_id(n,h) n,
+typedef enum {
+#include <lb/lb.api.h>
+    /* We'll want to know how many messages IDs we need... */
+    VL_MSG_FIRST_AVAILABLE,
+} vl_msg_id_t;
+#undef vl_msg_id
+
+/* define message structures */
+#define vl_typedefs
+#include <lb/lb.api.h>
+#undef vl_typedefs
+
+/* declare message handlers for each api */
+
+#define vl_endianfun             /* define message structures */
+#include <lb/lb.api.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...)
+#define vl_printfun
+#include <lb/lb.api.h>
+#undef vl_printfun
+
+/* Get the API version number. */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <lb/lb.api.h>
+#undef vl_api_version
+
+typedef struct {
+    /* API message ID base */
+    u16 msg_id_base;
+    vat_main_t *vat_main;
+} lb_test_main_t;
+
+lb_test_main_t lb_test_main;
+
+#define foreach_standard_reply_retval_handler   \
+_(lb_conf_reply)                 \
+_(lb_add_del_vip_reply)          \
+_(lb_add_del_as_reply)
+
+#define _(n)                                            \
+    static void vl_api_##n##_t_handler                  \
+    (vl_api_##n##_t * mp)                               \
+    {                                                   \
+        vat_main_t * vam = lb_test_main.vat_main;   \
+        i32 retval = ntohl(mp->retval);                 \
+        if (vam->async_mode) {                          \
+            vam->async_errors += (retval < 0);          \
+        } else {                                        \
+            vam->retval = retval;                       \
+            vam->result_ready = 1;                      \
+        }                                               \
+    }
+foreach_standard_reply_retval_handler;
+#undef _
+
+/*
+ * Table of message reply handlers, must include boilerplate handlers
+ * we just generated
+ */
+#define foreach_vpe_api_reply_msg                               \
+  _(LB_CONF_REPLY, lb_conf_reply)                                     \
+  _(LB_ADD_DEL_VIP_REPLY, lb_add_del_vip_reply)                       \
+  _(LB_ADD_DEL_AS_REPLY, lb_add_del_as_reply)
+
+static int api_lb_conf (vat_main_t * vam)
+{
+  unformat_input_t *i = vam->input;
+  vl_api_lb_conf_t mps, *mp;
+  int ret;
+
+  if (!unformat(i, "%U %U %u %u",
+               unformat_ip4_address, &mps.ip4_src_address,
+               unformat_ip6_address, mps.ip6_src_address,
+               &mps.sticky_buckets_per_core,
+               &mps.flow_timeout)) {
+    errmsg ("invalid arguments\n");
+    return -99;
+  }
+
+  M(LB_CONF, mp);
+  S(mp);
+  W (ret);
+  return ret;
+}
+
+static int api_lb_add_del_vip (vat_main_t * vam)
+{
+  unformat_input_t * i = vam->input;
+  vl_api_lb_add_del_vip_t mps, *mp;
+  int ret;
+  mps.is_del = 0;
+  mps.is_gre4 = 0;
+
+  if (!unformat(i, "%U",
+                unformat_ip46_prefix, mps.ip_prefix, &mps.prefix_length, IP46_TYPE_ANY)) {
+    errmsg ("invalid prefix\n");
+    return -99;
+  }
+
+  if (unformat(i, "gre4")) {
+    mps.is_gre4 = 1;
+  } else if (unformat(i, "gre6")) {
+    mps.is_gre4 = 0;
+  } else {
+    errmsg ("no encap\n");
+    return -99;
+  }
+
+  if (!unformat(i, "%d", &mps.new_flows_table_length)) {
+    errmsg ("no table lentgh\n");
+    return -99;
+  }
+
+  if (unformat(i, "del")) {
+    mps.is_del = 1;
+  }
+
+  M(LB_ADD_DEL_VIP, mp);
+  S(mp);
+  W (ret);
+  return ret;
+}
+
+static int api_lb_add_del_as (vat_main_t * vam)
+{
+  unformat_input_t * i = vam->input;
+  vl_api_lb_add_del_as_t mps, *mp;
+  int ret;
+  mps.is_del = 0;
+
+  if (!unformat(i, "%U %U",
+                unformat_ip46_prefix, mps.vip_ip_prefix, &mps.vip_prefix_length, IP46_TYPE_ANY,
+                unformat_ip46_address, mps.as_address)) {
+    errmsg ("invalid prefix or address\n");
+    return -99;
+  }
+
+  if (unformat(i, "del")) {
+    mps.is_del = 1;
+  }
+
+  M(LB_ADD_DEL_AS, mp);
+  S(mp);
+  W (ret);
+  return ret;
+}
+
+/*
+ * List of messages that the api test plugin sends,
+ * and that the data plane plugin processes
+ */
+#define foreach_vpe_api_msg                             \
+_(lb_conf, "<ip4-src-addr> <ip6-src-address> <sticky_buckets_per_core> <flow_timeout>") \
+_(lb_add_del_vip, "<ip-prefix> [gre4|gre6] <new_table_len> [del]") \
+_(lb_add_del_as, "<vip-ip-prefix> <address> [del]")
+
+static void 
+lb_vat_api_hookup (vat_main_t *vam)
+{
+  lb_test_main_t * lbtm = &lb_test_main;
+  /* Hook up handlers for replies from the data plane plug-in */
+#define _(N,n)                                                  \
+  vl_msg_api_set_handlers((VL_API_##N + lbtm->msg_id_base),       \
+                          #n,                                   \
+                          vl_api_##n##_t_handler,               \
+                          vl_noop_handler,                      \
+                          vl_api_##n##_t_endian,                \
+                          vl_api_##n##_t_print,                 \
+                          sizeof(vl_api_##n##_t), 1);
+  foreach_vpe_api_reply_msg;
+#undef _
+
+  /* API messages we can send */
+#define _(n,h) hash_set_mem (vam->function_by_name, #n, api_##n);
+  foreach_vpe_api_msg;
+#undef _
+
+  /* Help strings */
+#define _(n,h) hash_set_mem (vam->help_by_name, #n, h);
+  foreach_vpe_api_msg;
+#undef _
+}
+
+clib_error_t * vat_plugin_register (vat_main_t *vam)
+{
+  lb_test_main_t * lbtm = &lb_test_main;
+
+  u8 * name;
+
+  lbtm->vat_main = vam;
+
+  /* Ask the vpp engine for the first assigned message-id */
+  name = format (0, "lb_%08x%c", api_version, 0);
+  lbtm->msg_id_base = vl_client_get_first_plugin_msg_id ((char *) name);
+
+  if (lbtm->msg_id_base != (u16) ~0)
+    lb_vat_api_hookup (vam);
+
+  vec_free(name);
+
+  return 0;
+}
diff --git a/src/plugins/lb/lbhash.h b/src/plugins/lb/lbhash.h
new file mode 100644
index 00000000..c514fb57
--- /dev/null
+++ b/src/plugins/lb/lbhash.h
@@ -0,0 +1,216 @@
+/*
+ * Copyright (c) 2012 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.
+ */
+
+/**
+ * vppinfra already includes tons of different hash tables.
+ * MagLev flow table is a bit different. It has to be very efficient
+ * for both writing and reading operations. But it does not need to
+ * be 100% reliable (write can fail). It also needs to recycle
+ * old entries in a lazy way.
+ *
+ * This hash table is the most dummy hash table you can do.
+ * Fixed total size, fixed bucket size.
+ * Advantage is that it could be very efficient (maybe).
+ *
+ */
+
+#ifndef LB_PLUGIN_LB_LBHASH_H_
+#define LB_PLUGIN_LB_LBHASH_H_
+
+#include <vnet/vnet.h>
+
+#if defined (__SSE4_2__)
+#include <immintrin.h>
+#endif
+
+/*
+ * @brief Number of entries per bucket.
+ */
+#define LBHASH_ENTRY_PER_BUCKET 4
+
+#define LB_HASH_DO_NOT_USE_SSE_BUCKETS 0
+
+/*
+ * @brief One bucket contains 4 entries.
+ * Each bucket takes one 64B cache line in memory.
+ */
+typedef struct {
+  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
+  u32 hash[LBHASH_ENTRY_PER_BUCKET];
+  u32 timeout[LBHASH_ENTRY_PER_BUCKET];
+  u32 vip[LBHASH_ENTRY_PER_BUCKET];
+  u32 value[LBHASH_ENTRY_PER_BUCKET];
+} lb_hash_bucket_t;
+
+typedef struct {
+  u32 buckets_mask;
+  u32 timeout;
+  lb_hash_bucket_t buckets[];
+} lb_hash_t;
+
+#define lb_hash_nbuckets(h) (((h)->buckets_mask) + 1)
+#define lb_hash_size(h) ((h)->buckets_mask + LBHASH_ENTRY_PER_BUCKET)
+
+#define lb_hash_foreach_bucket(h, bucket) \
+  for (bucket = (h)->buckets; \
+	bucket < (h)->buckets + lb_hash_nbuckets(h); \
+	bucket++)
+
+#define lb_hash_foreach_entry(h, bucket, i) \
+    lb_hash_foreach_bucket(h, bucket) \
+      for (i = 0; i < LBHASH_ENTRY_PER_BUCKET; i++)
+
+#define lb_hash_foreach_valid_entry(h, bucket, i, now) \
+    lb_hash_foreach_entry(h, bucket, i) \
+       if (!clib_u32_loop_gt((now), bucket->timeout[i]))
+
+static_always_inline
+lb_hash_t *lb_hash_alloc(u32 buckets, u32 timeout)
+{
+  if (!is_pow2(buckets))
+    return NULL;
+
+  // Allocate 1 more bucket for prefetch
+  u32 size = ((u64)&((lb_hash_t *)(0))->buckets[0]) +
+      sizeof(lb_hash_bucket_t) * (buckets + 1);
+  u8 *mem = 0;
+  lb_hash_t *h;
+  vec_alloc_aligned(mem, size, CLIB_CACHE_LINE_BYTES);
+  h = (lb_hash_t *)mem;
+  h->buckets_mask = (buckets - 1);
+  h->timeout = timeout;
+  return h;
+}
+
+static_always_inline
+void lb_hash_free(lb_hash_t *h)
+{
+  u8 *mem = (u8 *)h;
+  vec_free(mem);
+}
+
+#if __SSE4_2__ && !defined (__i386__)
+static_always_inline
+u32 lb_hash_hash(u64 k0, u64 k1, u64 k2, u64 k3, u64 k4)
+{
+  u64 val = 0;
+  val = _mm_crc32_u64(val, k0);
+  val = _mm_crc32_u64(val, k1);
+  val = _mm_crc32_u64(val, k2);
+  val = _mm_crc32_u64(val, k3);
+  val = _mm_crc32_u64(val, k4);
+  return (u32) val;
+}
+#else
+static_always_inline
+u32 lb_hash_hash(u64 k0, u64 k1, u64 k2, u64 k3, u64 k4)
+{
+  u64 tmp = k0 ^ k1 ^ k2 ^ k3 ^ k4;
+  return (u32)clib_xxhash (tmp);
+}
+#endif
+
+static_always_inline
+void lb_hash_prefetch_bucket(lb_hash_t *ht, u32 hash)
+{
+  lb_hash_bucket_t *bucket = &ht->buckets[hash & ht->buckets_mask];
+  CLIB_PREFETCH(bucket, sizeof(*bucket), READ);
+}
+
+static_always_inline
+void lb_hash_get(lb_hash_t *ht, u32 hash, u32 vip, u32 time_now,
+		 u32 *available_index, u32 *found_value)
+{
+  lb_hash_bucket_t *bucket = &ht->buckets[hash & ht->buckets_mask];
+  *found_value = ~0;
+  *available_index = ~0;
+#if __SSE4_2__ && LB_HASH_DO_NOT_USE_SSE_BUCKETS == 0
+  u32 bitmask, found_index;
+  __m128i mask;
+
+  // mask[*] = timeout[*] > now
+  mask = _mm_cmpgt_epi32(_mm_loadu_si128 ((__m128i *) bucket->timeout),
+			 _mm_set1_epi32 (time_now));
+  // bitmask[*] = now <= timeout[*/4]
+  bitmask = (~_mm_movemask_epi8(mask)) & 0xffff;
+  // Get first index with now <= timeout[*], if any.
+  *available_index = (bitmask)?__builtin_ctz(bitmask)/4:*available_index;
+
+  // mask[*] = (timeout[*] > now) && (hash[*] == hash)
+  mask = _mm_and_si128(mask,
+		       _mm_cmpeq_epi32(
+			   _mm_loadu_si128 ((__m128i *) bucket->hash),
+			   _mm_set1_epi32 (hash)));
+
+  // Load the array of vip values
+  // mask[*] = (timeout[*] > now) && (hash[*] == hash) && (vip[*] == vip)
+  mask = _mm_and_si128(mask,
+		       _mm_cmpeq_epi32(
+			   _mm_loadu_si128 ((__m128i *) bucket->vip),
+			   _mm_set1_epi32 (vip)));
+
+  // mask[*] = (timeout[*x4] > now) && (hash[*x4] == hash) && (vip[*x4] == vip)
+  bitmask = _mm_movemask_epi8(mask);
+  // Get first index, if any
+  found_index = (bitmask)?__builtin_ctzll(bitmask)/4:0;
+  ASSERT(found_index < 4);
+  *found_value = (bitmask)?bucket->value[found_index]:*found_value;
+  bucket->timeout[found_index] =
+      (bitmask)?time_now + ht->timeout:bucket->timeout[found_index];
+#else
+  u32 i;
+  for (i = 0; i < LBHASH_ENTRY_PER_BUCKET; i++) {
+      u8 cmp = (bucket->hash[i] == hash && bucket->vip[i] == vip);
+      u8 timeouted = clib_u32_loop_gt(time_now, bucket->timeout[i]);
+      *found_value = (cmp || timeouted)?*found_value:bucket->value[i];
+      bucket->timeout[i] = (cmp || timeouted)?time_now + ht->timeout:bucket->timeout[i];
+      *available_index = (timeouted && (*available_index == ~0))?i:*available_index;
+
+      if (!cmp)
+	return;
+  }
+#endif
+}
+
+static_always_inline
+u32 lb_hash_available_value(lb_hash_t *h, u32 hash, u32 available_index)
+{
+  return h->buckets[hash & h->buckets_mask].value[available_index];
+}
+
+static_always_inline
+void lb_hash_put(lb_hash_t *h, u32 hash, u32 value, u32 vip,
+		 u32 available_index, u32 time_now)
+{
+  lb_hash_bucket_t *bucket = &h->buckets[hash & h->buckets_mask];
+  bucket->hash[available_index] = hash;
+  bucket->value[available_index] = value;
+  bucket->timeout[available_index] = time_now + h->timeout;
+  bucket->vip[available_index] = vip;
+}
+
+static_always_inline
+u32 lb_hash_elts(lb_hash_t *h, u32 time_now)
+{
+  u32 tot = 0;
+  lb_hash_bucket_t *bucket;
+  u32 i;
+  lb_hash_foreach_valid_entry(h, bucket, i, time_now) {
+    tot++;
+  }
+  return tot;
+}
+
+#endif /* LB_PLUGIN_LB_LBHASH_H_ */
diff --git a/src/plugins/lb/node.c b/src/plugins/lb/node.c
new file mode 100644
index 00000000..4a7485eb
--- /dev/null
+++ b/src/plugins/lb/node.c
@@ -0,0 +1,421 @@
+/*
+ * 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.
+ */
+
+#include <lb/lb.h>
+
+#include <vnet/gre/packet.h>
+#include <lb/lbhash.h>
+
+#define foreach_lb_error \
+ _(NONE, "no error") \
+ _(PROTO_NOT_SUPPORTED, "protocol not supported")
+
+typedef enum {
+#define _(sym,str) LB_ERROR_##sym,
+  foreach_lb_error
+#undef _
+    LB_N_ERROR,
+} lb_error_t;
+
+static char *lb_error_strings[] = {
+#define _(sym,string) string,
+    foreach_lb_error
+#undef _
+};
+
+typedef struct {
+  u32 vip_index;
+  u32 as_index;
+} lb_trace_t;
+
+u8 *
+format_lb_trace (u8 * s, va_list * args)
+{
+  lb_main_t *lbm = &lb_main;
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  lb_trace_t *t = va_arg (*args, lb_trace_t *);
+  if (pool_is_free_index(lbm->vips, t->vip_index)) {
+      s = format(s, "lb vip[%d]: This VIP was freed since capture\n");
+  } else {
+      s = format(s, "lb vip[%d]: %U\n", t->vip_index, format_lb_vip, &lbm->vips[t->vip_index]);
+  }
+  if (pool_is_free_index(lbm->ass, t->as_index)) {
+      s = format(s, "lb as[%d]: This AS was freed since capture\n");
+  } else {
+      s = format(s, "lb as[%d]: %U\n", t->as_index, format_lb_as, &lbm->ass[t->as_index]);
+  }
+  return s;
+}
+
+lb_hash_t *lb_get_sticky_table(u32 thread_index)
+{
+  lb_main_t *lbm = &lb_main;
+  lb_hash_t *sticky_ht = lbm->per_cpu[thread_index].sticky_ht;
+  //Check if size changed
+  if (PREDICT_FALSE(sticky_ht && (lbm->per_cpu_sticky_buckets != lb_hash_nbuckets(sticky_ht))))
+    {
+      //Dereference everything in there
+      lb_hash_bucket_t *b;
+      u32 i;
+      lb_hash_foreach_entry(sticky_ht, b, i) {
+	vlib_refcount_add(&lbm->as_refcount, thread_index, b->value[i], -1);
+	vlib_refcount_add(&lbm->as_refcount, thread_index, 0, 1);
+      }
+
+      lb_hash_free(sticky_ht);
+      sticky_ht = NULL;
+    }
+
+  //Create if necessary
+  if (PREDICT_FALSE(sticky_ht == NULL)) {
+    lbm->per_cpu[thread_index].sticky_ht = lb_hash_alloc(lbm->per_cpu_sticky_buckets, lbm->flow_timeout);
+    sticky_ht = lbm->per_cpu[thread_index].sticky_ht;
+    clib_warning("Regenerated sticky table %p", sticky_ht);
+  }
+
+  ASSERT(sticky_ht);
+
+  //Update timeout
+  sticky_ht->timeout = lbm->flow_timeout;
+  return sticky_ht;
+}
+
+u64
+lb_node_get_other_ports4(ip4_header_t *ip40)
+{
+  return 0;
+}
+
+u64
+lb_node_get_other_ports6(ip6_header_t *ip60)
+{
+  return 0;
+}
+
+static_always_inline u32
+lb_node_get_hash(vlib_buffer_t *p, u8 is_input_v4)
+{
+  u32 hash;
+  if (is_input_v4)
+    {
+      ip4_header_t *ip40;
+      u64 ports;
+      ip40 = vlib_buffer_get_current (p);
+      if (PREDICT_TRUE (ip40->protocol == IP_PROTOCOL_TCP ||
+		       ip40->protocol == IP_PROTOCOL_UDP))
+	ports = ((u64)((udp_header_t *)(ip40 + 1))->src_port << 16) |
+	  ((u64)((udp_header_t *)(ip40 + 1))->dst_port);
+      else
+	ports = lb_node_get_other_ports4(ip40);
+
+      hash = lb_hash_hash(*((u64 *)&ip40->address_pair), ports,
+			  0, 0, 0);
+    }
+  else
+    {
+      ip6_header_t *ip60;
+      ip60 = vlib_buffer_get_current (p);
+      u64 ports;
+      if (PREDICT_TRUE (ip60->protocol == IP_PROTOCOL_TCP ||
+			ip60->protocol == IP_PROTOCOL_UDP))
+	ports = ((u64)((udp_header_t *)(ip60 + 1))->src_port << 16) |
+	((u64)((udp_header_t *)(ip60 + 1))->dst_port);
+      else
+	ports = lb_node_get_other_ports6(ip60);
+
+      hash = lb_hash_hash(ip60->src_address.as_u64[0],
+			  ip60->src_address.as_u64[1],
+			  ip60->dst_address.as_u64[0],
+			  ip60->dst_address.as_u64[1],
+			  ports);
+    }
+  return hash;
+}
+
+static_always_inline uword
+lb_node_fn (vlib_main_t * vm,
+         vlib_node_runtime_t * node, vlib_frame_t * frame,
+         u8 is_input_v4, //Compile-time parameter stating that is input is v4 (or v6)
+         u8 is_encap_v4) //Compile-time parameter stating that is GRE encap is v4 (or v6)
+{
+  lb_main_t *lbm = &lb_main;
+  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
+  u32 thread_index = vlib_get_thread_index();
+  u32 lb_time = lb_hash_time_now(vm);
+
+  lb_hash_t *sticky_ht = lb_get_sticky_table(thread_index);
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+
+  u32 nexthash0 = 0;
+  if (PREDICT_TRUE(n_left_from > 0))
+    nexthash0 = lb_node_get_hash(vlib_get_buffer (vm, from[0]), is_input_v4);
+
+  while (n_left_from > 0)
+  {
+    vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+    while (n_left_from > 0 && n_left_to_next > 0)
+    {
+      u32 pi0;
+      vlib_buffer_t *p0;
+      lb_vip_t *vip0;
+      u32 asindex0;
+      u16 len0;
+      u32 available_index0;
+      u8 counter = 0;
+      u32 hash0 = nexthash0;
+
+      if (PREDICT_TRUE(n_left_from > 1))
+	{
+	  vlib_buffer_t *p1 = vlib_get_buffer (vm, from[1]);
+	  //Compute next hash and prefetch bucket
+	  nexthash0 = lb_node_get_hash(p1, is_input_v4);
+	  lb_hash_prefetch_bucket(sticky_ht, nexthash0);
+	  //Prefetch for encap, next
+	  CLIB_PREFETCH (vlib_buffer_get_current(p1) - 64, 64, STORE);
+	}
+
+      if (PREDICT_TRUE(n_left_from > 2))
+	{
+	  vlib_buffer_t *p2;
+	  p2 = vlib_get_buffer(vm, from[2]);
+	  /* prefetch packet header and data */
+	  vlib_prefetch_buffer_header(p2, STORE);
+	  CLIB_PREFETCH (vlib_buffer_get_current(p2), 64, STORE);
+	}
+
+      pi0 = to_next[0] = from[0];
+      from += 1;
+      n_left_from -= 1;
+      to_next += 1;
+      n_left_to_next -= 1;
+
+      p0 = vlib_get_buffer (vm, pi0);
+      vip0 = pool_elt_at_index (lbm->vips,
+				vnet_buffer (p0)->ip.adj_index[VLIB_TX]);
+
+      if (is_input_v4)
+	{
+	  ip4_header_t *ip40;
+	  ip40 = vlib_buffer_get_current (p0);
+	  len0 = clib_net_to_host_u16(ip40->length);
+	}
+      else
+	{
+	  ip6_header_t *ip60;
+	  ip60 = vlib_buffer_get_current (p0);
+	  len0 = clib_net_to_host_u16(ip60->payload_length) + sizeof(ip6_header_t);
+	}
+
+      lb_hash_get(sticky_ht, hash0, vnet_buffer (p0)->ip.adj_index[VLIB_TX],
+		  lb_time, &available_index0, &asindex0);
+
+      if (PREDICT_TRUE(asindex0 != ~0))
+	{
+	  //Found an existing entry
+	  counter = LB_VIP_COUNTER_NEXT_PACKET;
+	}
+      else if (PREDICT_TRUE(available_index0 != ~0))
+	{
+	  //There is an available slot for a new flow
+	  asindex0 = vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].as_index;
+	  counter = LB_VIP_COUNTER_FIRST_PACKET;
+	  counter = (asindex0 == 0)?LB_VIP_COUNTER_NO_SERVER:counter;
+
+	  //TODO: There are race conditions with as0 and vip0 manipulation.
+	  //Configuration may be changed, vectors resized, etc...
+
+	  //Dereference previously used
+	  vlib_refcount_add(&lbm->as_refcount, thread_index,
+			    lb_hash_available_value(sticky_ht, hash0, available_index0), -1);
+	  vlib_refcount_add(&lbm->as_refcount, thread_index,
+			    asindex0, 1);
+
+	  //Add sticky entry
+	  //Note that when there is no AS configured, an entry is configured anyway.
+	  //But no configured AS is not something that should happen
+	  lb_hash_put(sticky_ht, hash0, asindex0,
+		      vnet_buffer (p0)->ip.adj_index[VLIB_TX],
+		      available_index0, lb_time);
+	}
+      else
+	{
+	  //Could not store new entry in the table
+	  asindex0 = vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].as_index;
+	  counter = LB_VIP_COUNTER_UNTRACKED_PACKET;
+	}
+
+      vlib_increment_simple_counter(&lbm->vip_counters[counter],
+				    thread_index,
+				    vnet_buffer (p0)->ip.adj_index[VLIB_TX],
+				    1);
+
+      //Now let's encap
+      {
+	gre_header_t *gre0;
+	if (is_encap_v4)
+	  {
+	    ip4_header_t *ip40;
+	    vlib_buffer_advance(p0, - sizeof(ip4_header_t) - sizeof(gre_header_t));
+	    ip40 = vlib_buffer_get_current(p0);
+	    gre0 = (gre_header_t *)(ip40 + 1);
+	    ip40->src_address = lbm->ip4_src_address;
+	    ip40->dst_address = lbm->ass[asindex0].address.ip4;
+	    ip40->ip_version_and_header_length = 0x45;
+	    ip40->ttl = 128;
+	    ip40->fragment_id = 0;
+	    ip40->flags_and_fragment_offset = 0;
+	    ip40->length = clib_host_to_net_u16(len0 + sizeof(gre_header_t) + sizeof(ip4_header_t));
+	    ip40->protocol = IP_PROTOCOL_GRE;
+	    ip40->checksum = ip4_header_checksum (ip40);
+	  }
+	else
+	  {
+	    ip6_header_t *ip60;
+	    vlib_buffer_advance(p0, - sizeof(ip6_header_t) - sizeof(gre_header_t));
+	    ip60 = vlib_buffer_get_current(p0);
+	    gre0 = (gre_header_t *)(ip60 + 1);
+	    ip60->dst_address = lbm->ass[asindex0].address.ip6;
+	    ip60->src_address = lbm->ip6_src_address;
+	    ip60->hop_limit = 128;
+	    ip60->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6<<28);
+	    ip60->payload_length = clib_host_to_net_u16(len0 + sizeof(gre_header_t));
+	    ip60->protocol = IP_PROTOCOL_GRE;
+	  }
+
+	gre0->flags_and_version = 0;
+	gre0->protocol = (is_input_v4)?
+	    clib_host_to_net_u16(0x0800):
+	    clib_host_to_net_u16(0x86DD);
+      }
+
+      if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
+	{
+	  lb_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
+	  tr->as_index = asindex0;
+	  tr->vip_index = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
+	}
+
+      //Enqueue to next
+      //Note that this is going to error if asindex0 == 0
+      vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbm->ass[asindex0].dpo.dpoi_index;
+      vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+				       n_left_to_next, pi0,
+				       lbm->ass[asindex0].dpo.dpoi_next_node);
+    }
+    vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+  }
+
+  return frame->n_vectors;
+}
+
+static uword
+lb6_gre6_node_fn (vlib_main_t * vm,
+         vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  return lb_node_fn(vm, node, frame, 0, 0);
+}
+
+static uword
+lb6_gre4_node_fn (vlib_main_t * vm,
+         vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  return lb_node_fn(vm, node, frame, 0, 1);
+}
+
+static uword
+lb4_gre6_node_fn (vlib_main_t * vm,
+         vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  return lb_node_fn(vm, node, frame, 1, 0);
+}
+
+static uword
+lb4_gre4_node_fn (vlib_main_t * vm,
+         vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  return lb_node_fn(vm, node, frame, 1, 1);
+}
+
+VLIB_REGISTER_NODE (lb6_gre6_node) =
+{
+  .function = lb6_gre6_node_fn,
+  .name = "lb6-gre6",
+  .vector_size = sizeof (u32),
+  .format_trace = format_lb_trace,
+
+  .n_errors = LB_N_ERROR,
+  .error_strings = lb_error_strings,
+
+  .n_next_nodes = LB_N_NEXT,
+  .next_nodes =
+  {
+      [LB_NEXT_DROP] = "error-drop"
+  },
+};
+
+VLIB_REGISTER_NODE (lb6_gre4_node) =
+{
+  .function = lb6_gre4_node_fn,
+  .name = "lb6-gre4",
+  .vector_size = sizeof (u32),
+  .format_trace = format_lb_trace,
+
+  .n_errors = LB_N_ERROR,
+  .error_strings = lb_error_strings,
+
+  .n_next_nodes = LB_N_NEXT,
+  .next_nodes =
+  {
+      [LB_NEXT_DROP] = "error-drop"
+  },
+};
+
+VLIB_REGISTER_NODE (lb4_gre6_node) =
+{
+  .function = lb4_gre6_node_fn,
+  .name = "lb4-gre6",
+  .vector_size = sizeof (u32),
+  .format_trace = format_lb_trace,
+
+  .n_errors = LB_N_ERROR,
+  .error_strings = lb_error_strings,
+
+  .n_next_nodes = LB_N_NEXT,
+  .next_nodes =
+  {
+      [LB_NEXT_DROP] = "error-drop"
+  },
+};
+
+VLIB_REGISTER_NODE (lb4_gre4_node) =
+{
+  .function = lb4_gre4_node_fn,
+  .name = "lb4-gre4",
+  .vector_size = sizeof (u32),
+  .format_trace = format_lb_trace,
+
+  .n_errors = LB_N_ERROR,
+  .error_strings = lb_error_strings,
+
+  .n_next_nodes = LB_N_NEXT,
+  .next_nodes =
+  {
+      [LB_NEXT_DROP] = "error-drop"
+  },
+};
+
diff --git a/src/plugins/lb/refcount.c b/src/plugins/lb/refcount.c
new file mode 100644
index 00000000..6f01ab5a
--- /dev/null
+++ b/src/plugins/lb/refcount.c
@@ -0,0 +1,41 @@
+/*
+ * 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.
+ */
+
+#include <lb/refcount.h>
+
+void __vlib_refcount_resize(vlib_refcount_per_cpu_t *per_cpu, u32 size)
+{
+  u32 *new_counter = 0, *old_counter;
+  vec_validate(new_counter, size);
+  memcpy(new_counter, per_cpu->counters, per_cpu->length);
+  old_counter = per_cpu->counters;
+  per_cpu->counters = new_counter;
+  CLIB_MEMORY_BARRIER();
+  per_cpu->length = vec_len(new_counter);
+  vec_free(old_counter);
+}
+
+u64 vlib_refcount_get(vlib_refcount_t *r, u32 index)
+{
+  u64 count = 0;
+  vlib_thread_main_t *tm = vlib_get_thread_main ();
+  u32 thread_index;
+  for (thread_index = 0; thread_index < tm->n_vlib_mains; thread_index++) {
+    if (r->per_cpu[thread_index].length > index)
+      count += r->per_cpu[thread_index].counters[index];
+  }
+  return count;
+}
+
diff --git a/src/plugins/lb/refcount.h b/src/plugins/lb/refcount.h
new file mode 100644
index 00000000..dcfcb3fe
--- /dev/null
+++ b/src/plugins/lb/refcount.h
@@ -0,0 +1,67 @@
+/*
+ * 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.
+ */
+
+/*
+ * vlib provides lock-free counters but those
+ * - Have 16bits per-CPU counter, which may overflow.
+ * - Would only increment.
+ *
+ * This is very similar to vlib counters, but may be used to count reference.
+ * Such a counter includes an arbitrary number of counters. Each counter
+ * is identified by its index. This is used to aggregate per-cpu memory.
+ *
+ * Warning:
+ *   This reference counter is lock-free but is not race-condition free.
+ *   The counting result is approximate and another mechanism needs to be used
+ *   in order to ensure that an object may be freed.
+ *
+ */
+
+#include <vnet/vnet.h>
+
+typedef struct {
+  u32 *counters;
+  u32 length;
+  u32 *reader_lengths;
+  CLIB_CACHE_LINE_ALIGN_MARK(o);
+} vlib_refcount_per_cpu_t;
+
+typedef struct {
+  vlib_refcount_per_cpu_t *per_cpu;
+} vlib_refcount_t;
+
+void __vlib_refcount_resize(vlib_refcount_per_cpu_t *per_cpu, u32 size);
+
+static_always_inline
+void vlib_refcount_add(vlib_refcount_t *r, u32 thread_index, u32 counter_index, i32 v)
+{
+  vlib_refcount_per_cpu_t *per_cpu = &r->per_cpu[thread_index];
+  if (PREDICT_FALSE(counter_index >= per_cpu->length))
+    __vlib_refcount_resize(per_cpu, clib_max(counter_index + 16, per_cpu->length * 2));
+
+  per_cpu->counters[counter_index] += v;
+}
+
+u64 vlib_refcount_get(vlib_refcount_t *r, u32 index);
+
+static_always_inline
+void vlib_refcount_init(vlib_refcount_t *r)
+{
+  vlib_thread_main_t *tm = vlib_get_thread_main ();
+  r->per_cpu = 0;
+  vec_validate (r->per_cpu, tm->n_vlib_mains - 1);
+}
+
+
diff --git a/src/plugins/lb/util.c b/src/plugins/lb/util.c
new file mode 100644
index 00000000..d969d168
--- /dev/null
+++ b/src/plugins/lb/util.c
@@ -0,0 +1,72 @@
+/*
+ * 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.
+ */
+
+#include <lb/util.h>
+
+void ip46_prefix_normalize(ip46_address_t *prefix, u8 plen)
+{
+  if (plen == 0) {
+    prefix->as_u64[0] = 0;
+    prefix->as_u64[1] = 0;
+  } else if (plen <= 64) {
+    prefix->as_u64[0] &= clib_host_to_net_u64(0xffffffffffffffffL << (64 - plen));
+    prefix->as_u64[1] = 0;
+  } else {
+    prefix->as_u64[1] &= clib_host_to_net_u64(0xffffffffffffffffL << (128 - plen));
+  }
+
+}
+
+uword unformat_ip46_prefix (unformat_input_t * input, va_list * args)
+{
+  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
+  u8 *len = va_arg (*args, u8 *);
+  ip46_type_t type = va_arg (*args, ip46_type_t);
+
+  u32 l;
+  if ((type != IP46_TYPE_IP6) && unformat(input, "%U/%u", unformat_ip4_address, &ip46->ip4, &l)) {
+    if (l > 32)
+      return 0;
+    *len = l + 96;
+    ip46->pad[0] = ip46->pad[1] = ip46->pad[2] = 0;
+  } else if ((type != IP46_TYPE_IP4) && unformat(input, "%U/%u", unformat_ip6_address, &ip46->ip6, &l)) {
+    if (l > 128)
+      return 0;
+    *len = l;
+  } else {
+    return 0;
+  }
+  return 1;
+}
+
+u8 *format_ip46_prefix (u8 * s, va_list * args)
+{
+  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
+  u32 len = va_arg (*args, u32); //va_arg cannot use u8 or u16
+  ip46_type_t type = va_arg (*args, ip46_type_t);
+
+  int is_ip4 = 0;
+  if (type == IP46_TYPE_IP4)
+    is_ip4 = 1;
+  else if (type == IP46_TYPE_IP6)
+    is_ip4 = 0;
+  else
+    is_ip4 = (len >= 96) && ip46_address_is_ip4(ip46);
+
+  return is_ip4 ?
+      format(s, "%U/%d", format_ip4_address, &ip46->ip4, len - 96):
+      format(s, "%U/%d", format_ip6_address, &ip46->ip6, len);
+}
+
diff --git a/src/plugins/lb/util.h b/src/plugins/lb/util.h
new file mode 100644
index 00000000..3f082310
--- /dev/null
+++ b/src/plugins/lb/util.h
@@ -0,0 +1,40 @@
+/*
+ * 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.
+ */
+
+/*
+ * Non-LB specific stuff comes here
+ */
+
+#ifndef LB_PLUGIN_LB_UTIL_H_
+#define LB_PLUGIN_LB_UTIL_H_
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+
+#define ip46_address_type(ip46) (ip46_address_is_ip4(ip46)?IP46_TYPE_IP4:IP46_TYPE_IP6)
+#define ip46_prefix_is_ip4(ip46, len) ((len) >= 96 && ip46_address_is_ip4(ip46))
+#define ip46_prefix_type(ip46, len) (ip46_prefix_is_ip4(ip46, len)?IP46_TYPE_IP4:IP46_TYPE_IP6)
+
+void ip46_prefix_normalize(ip46_address_t *prefix, u8 plen);
+uword unformat_ip46_prefix (unformat_input_t * input, va_list * args);
+u8 *format_ip46_prefix (u8 * s, va_list * args);
+
+/**
+ * 32 bits integer comparison for running values.
+ * 1 > 0 is true. But 1 > 0xffffffff also is.
+ */
+#define clib_u32_loop_gt(a, b) (((u32)(a)) - ((u32)(b)) < 0x7fffffff)
+
+#endif /* LB_PLUGIN_LB_UTIL_H_ */