aboutsummaryrefslogtreecommitdiffstats
path: root/.gitignore
AgeCommit message (Expand)AuthorFilesLines
2018-09-28gitignore: build/external/downloadsFlorin Coras1-1/+2
2018-09-24Add the sphinx docs build optionsjdenisco1-1/+1
2018-09-20rename vpp-dpdk-dev to vpp-ext-depsDamjan Marion1-4/+4
2018-08-17CMake as an alternative to autotools (experimental)Damjan Marion1-1/+0
2018-07-27Fix .gitignore so docs/Makefile is not ignored. Add README and Makefile. Fis ...John DeNisco1-0/+1
2018-07-26Initial commit of Sphinx docsJohn DeNisco1-0/+2
2018-06-22Python API: Add enum and union support.Ole Troan1-2/+0
2018-06-21Add .pydevproject to .gitignoreMarek Gradzki1-0/+1
2018-06-18Revert "Python API: Add enum and union support."Ole Trøan1-0/+2
2018-06-17Python API: Add enum and union support.Ole Troan1-2/+0
2018-05-31Add src/vlib/config.h.in templateDamjan Marion1-1/+0
2018-03-15remove bootstrap from top-level MakefileDamjan Marion1-1/+1
2018-03-15use system provided ccache linksDamjan Marion1-1/+0
2018-02-07Update gitignore for cmakeKeith Burns (alagalah)1-0/+2
2017-12-15Ignore core filesKeith Burns (alagalah)1-0/+3
2017-12-04Optimize RPM build processRenato Botelho do Couto1-0/+2
2017-11-01VPP Object Model (VOM)Neale Ranns1-0/+1
2017-09-19Add new C APIKlement Sekera1-0/+1
2017-09-08gitignore update for IDEKeith Burns (alagalah)1-1/+2
2017-09-07Allow individual stats API and introduce stats.apiKeith Burns (alagalah)1-0/+1
2017-08-29Add .pybuild to gitignoreKeith Burns (alagalah)1-0/+1
2017-08-22Update gitignore for DPDK filesKeith Burns (alagalah)1-0/+2
2017-01-13vppctl: new bash completion for vppctl commandsPadraig Connolly1-0/+3
2017-01-01Move java,lua api and remaining plugins to src/Damjan Marion1-5/+5
2016-12-09Add make test code coverage reporting using gcovJuraj Sloboda1-0/+1
2016-11-22GRE tests and fixesNeale Ranns1-0/+3
2016-11-01fix typo in .gitignoreKlement Sekera1-1/+1
2016-10-31add vpp debugging support to test frameworkKlement Sekera1-0/+2
2016-10-25Add generated python bindings to .gitignoreMarek Gradzki1-0/+5
2016-09-21A Protocol Independent Hierarchical FIB (VPP-352)Neale Ranns1-2/+2
2016-08-31VPP-221 CLI auto-documentation infrastructureChris Luke1-0/+3
2016-08-30VPP-364 Add vpp-api/python/build to gitignoreFlorin Coras1-0/+2
2016-08-25VPP Python language binding - plugin supportOle Troan1-2/+2
2016-08-16Create python package for jvpp generation.Ed Warnicke1-0/+3
2016-08-12VPP-237: Checkstyle script to check for new checkstyle breakageEd Warnicke1-0/+3
2016-07-21Updating gitignore for generated plugins folderKeith Burns (alagalah)1-0/+1
2016-06-19gitignore gtagsKeith Burns (alagalah)1-0/+4
2016-06-14gitignore change due to DPDK download suffix changeKeith Burns (alagalah)1-0/+1
2016-05-13VPP-57 Add Doxygen to VPPChris Luke1-0/+3
2016-05-12Generate jvpp sources in build-rootMaros Marsalek1-5/+0
2016-05-02HONEYCOMB-10: jVpp - the new java API. C code and jar file generationMarek Gradzki1-0/+6
2016-04-24Updated .gitignore for Python API generated fileKeith Burns (alagalah)1-0/+1
2016-04-12Add unit test infrastructure for LISP protocolFilip Tehlar1-0/+1
2016-03-25Add build-root/*.rpm to .gitignoreEd Warnicke1-0/+1
2016-03-18add ctags and cscope files to .gitignoreDamjan Marion1-0/+4
2016-03-04gitignoreMaros Marsalek1-0/+5
2016-02-01Add a vpp-dpdk-dev package, enable plugins to use dpdk APIs directlyDave Barach1-0/+1
2016-01-31Git ignore additionsKeith Burns (alagalah)1-0/+5
2015-12-23ylwrap is also autotools autogenerated fileDamjan Marion1-0/+1
2015-12-16Update .gitignore to ignore autotools filesEd Warnicke1-1/+25
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 
/*
 *------------------------------------------------------------------
 * Copyright (c) 2017 Intel 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 <stdint.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <inttypes.h>

#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/fib_table.h>
#include <vnet/mfib/mfib_table.h>
#include <vnet/adj/adj_mcast.h>
#include <vnet/dpo/dpo.h>
#include <vnet/plugin/plugin.h>
#include <vpp/app/version.h>
#include <gtpu/gtpu.h>


gtpu_main_t gtpu_main;

/* *INDENT-OFF* */
VNET_FEATURE_INIT (ip4_gtpu_bypass, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "ip4-gtpu-bypass",
  .runs_before = VNET_FEATURES ("ip4-lookup"),
};

VNET_FEATURE_INIT (ip6_gtpu_bypass, static) = {
  .arc_name = "ip6-unicast",
  .node_name = "ip6-gtpu-bypass",
  .runs_before = VNET_FEATURES ("ip6-lookup"),
};
/* *INDENT-on* */

static u8 *
format_decap_next (u8 * s, va_list * args)
{
  u32 next_index = va_arg (*args, u32);

  switch (next_index)
    {
    case GTPU_INPUT_NEXT_DROP:
      return format (s, "drop");
    case GTPU_INPUT_NEXT_L2_INPUT:
      return format (s, "l2");
    case GTPU_INPUT_NEXT_IP4_INPUT:
      return format (s, "ip4");
    case GTPU_INPUT_NEXT_IP6_INPUT:
      return format (s, "ip6");
    default:
      return format (s, "index %d", next_index);
    }
  return s;
}

u8 *
format_gtpu_tunnel (u8 * s, va_list * args)
{
  gtpu_tunnel_t *t = va_arg (*args, gtpu_tunnel_t *);
  gtpu_main_t *ngm = &gtpu_main;

  s = format (s, "[%d] src %U dst %U teid %d sw_if_index %d ",
	      t - ngm->tunnels,
	      format_ip46_address, &t->src, IP46_TYPE_ANY,
	      format_ip46_address, &t->dst, IP46_TYPE_ANY,
	      t->teid, t->sw_if_index);

  if (ip46_address_is_multicast (&t->dst))
    s = format (s, "mcast_sw_if_index %d ", t->mcast_sw_if_index);

  s = format (s, "encap_fib_index %d fib_entry_index %d decap_next %U\n",
	      t->encap_fib_index, t->fib_entry_index,
	      format_decap_next, t->decap_next_index);
  return s;
}

static u8 *
format_gtpu_name (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  return format (s, "gtpu_tunnel%d", dev_instance);
}

static uword
dummy_interface_tx (vlib_main_t * vm,
		    vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  clib_warning ("you shouldn't be here, leaking buffers...");
  return frame->n_vectors;
}

static clib_error_t *
gtpu_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
  u32 hw_flags = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ?
    VNET_HW_INTERFACE_FLAG_LINK_UP : 0;
  vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);

  return /* no error */ 0;
}

/* *INDENT-OFF* */
VNET_DEVICE_CLASS (gtpu_device_class,static) = {
  .name = "GTPU",
  .format_device_name = format_gtpu_name,
  .format_tx_trace = format_gtpu_encap_trace,
  .tx_function = dummy_interface_tx,
  .admin_up_down_function = gtpu_interface_admin_up_down,
};
/* *INDENT-ON* */

static u8 *
format_gtpu_header_with_length (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  s = format (s, "unimplemented dev %u", dev_instance);
  return s;
}

/* *INDENT-OFF* */
VNET_HW_INTERFACE_CLASS (gtpu_hw_class) =
{
  .name = "GTPU",
  .format_header = format_gtpu_header_with_length,
  .build_rewrite = default_build_rewrite,
};
/* *INDENT-ON* */

static void
gtpu_tunnel_restack_dpo (gtpu_tunnel_t * t)
{
  dpo_id_t dpo = DPO_INVALID;
  u32 encap_index = ip46_address_is_ip4 (&t->dst) ?
    gtpu4_encap_node.index : gtpu6_encap_node.index;
  fib_forward_chain_type_t forw_type = ip46_address_is_ip4 (&t->dst) ?
    FIB_FORW_CHAIN_TYPE_UNICAST_IP4 : FIB_FORW_CHAIN_TYPE_UNICAST_IP6;

  fib_entry_contribute_forwarding (t->fib_entry_index, forw_type, &dpo);
  dpo_stack_from_node (encap_index, &t->next_dpo, &dpo);
  dpo_reset (&dpo);
}

static gtpu_tunnel_t *
gtpu_tunnel_from_fib_node (fib_node_t * node)
{
  return ((gtpu_tunnel_t *) (((char *) node) -
			     STRUCT_OFFSET_OF (gtpu_tunnel_t, node)));
}

/**
 * Function definition to backwalk a FIB node -
 * Here we will restack the new dpo of GTPU DIP to encap node.
 */
static fib_node_back_walk_rc_t
gtpu_tunnel_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
{
  gtpu_tunnel_restack_dpo (gtpu_tunnel_from_fib_node (node));
  return (FIB_NODE_BACK_WALK_CONTINUE);
}

/**
 * Function definition to get a FIB node from its index
 */
static fib_node_t *
gtpu_tunnel_fib_node_get (fib_node_index_t index)
{
  gtpu_tunnel_t *t;
  gtpu_main_t *gtm = &gtpu_main;

  t = pool_elt_at_index (gtm->tunnels, index);

  return (&t->node);
}

/**
 * Function definition to inform the FIB node that its last lock has gone.
 */
static void
gtpu_tunnel_last_lock_gone (fib_node_t * node)
{
  /*
   * The GTPU tunnel is a root of the graph. As such
   * it never has children and thus is never locked.
   */
  ASSERT (0);
}

/*
 * Virtual function table registered by GTPU tunnels
 * for participation in the FIB object graph.
 */
const static fib_node_vft_t gtpu_vft = {
  .fnv_get = gtpu_tunnel_fib_node_get,
  .fnv_last_lock = gtpu_tunnel_last_lock_gone,
  .fnv_back_walk = gtpu_tunnel_back_walk,
};


#define foreach_copy_field                      \
_(teid)                                          \
_(mcast_sw_if_index)                            \
_(encap_fib_index)                              \
_(decap_next_index)                             \
_(src)                                          \
_(dst)

static void
ip_udp_gtpu_rewrite (gtpu_tunnel_t * t, bool is_ip6)
{
  union
  {
    ip4_gtpu_header_t *h4;
    ip6_gtpu_header_t *h6;
    u8 *rw;
  } r =
  {
  .rw = 0};
  int len = is_ip6 ? sizeof *r.h6 : sizeof *r.h4;

  vec_validate_aligned (r.rw, len - 1, CLIB_CACHE_LINE_BYTES);

  udp_header_t *udp;
  gtpu_header_t *gtpu;
  /* Fixed portion of the (outer) ip header */
  if (!is_ip6)
    {
      ip4_header_t *ip = &r.h4->ip4;
      udp = &r.h4->udp;
      gtpu = &r.h4->gtpu;
      ip->ip_version_and_header_length = 0x45;
      ip->ttl = 254;
      ip->protocol = IP_PROTOCOL_UDP;

      ip->src_address = t->src.ip4;
      ip->dst_address = t->dst.ip4;

      /* we fix up the ip4 header length and checksum after-the-fact */
      ip->checksum = ip4_header_checksum (ip);
    }
  else
    {
      ip6_header_t *ip = &r.h6->ip6;
      udp = &r.h6->udp;
      gtpu = &r.h6->gtpu;
      ip->ip_version_traffic_class_and_flow_label =
	clib_host_to_net_u32 (6 << 28);
      ip->hop_limit = 255;
      ip->protocol = IP_PROTOCOL_UDP;

      ip->src_address = t->src.ip6;
      ip->dst_address = t->dst.ip6;
    }

  /* UDP header, randomize src port on something, maybe? */
  udp->src_port = clib_host_to_net_u16 (2152);
  udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_GTPU);

  /* GTPU header */
  gtpu->ver_flags = GTPU_V1_VER | GTPU_PT_GTP;
  gtpu->type = GTPU_TYPE_GTPU;
  gtpu->teid = clib_host_to_net_u32 (t->teid);

  t->rewrite = r.rw;
  /* Now only support 8-byte gtpu header. TBD */
  _vec_len (t->rewrite) = sizeof (ip4_gtpu_header_t) - 4;

  return;
}

static bool
gtpu_decap_next_is_valid (gtpu_main_t * gtm, u32 is_ip6, u32 decap_next_index)
{
  vlib_main_t *vm = gtm->vlib_main;
  u32 input_idx = (!is_ip6) ? gtpu4_input_node.index : gtpu6_input_node.index;
  vlib_node_runtime_t *r = vlib_node_get_runtime (vm, input_idx);

  return decap_next_index < r->n_next_nodes;
}

static void
hash_set_key_copy (uword ** h, void *key, uword v)
{
  size_t ksz = hash_header (*h)->user;
  void *copy = clib_mem_alloc (ksz);
  clib_memcpy (copy, key, ksz);
  hash_set_mem (*h, copy, v);
}

static void
hash_unset_key_free (uword ** h, void *key)
{
  hash_pair_t *hp = hash_get_pair_mem (*h, key);
  ASSERT (hp);
  key = uword_to_pointer (hp->key, void *);
  hash_unset_mem (*h, key);
  clib_mem_free (key);
}

static uword
vtep_addr_ref (ip46_address_t * ip)
{
  uword *vtep = ip46_address_is_ip4 (ip) ?
    hash_get (gtpu_main.vtep4, ip->ip4.as_u32) :
    hash_get_mem (gtpu_main.vtep6, &ip->ip6);
  if (vtep)
    return ++(*vtep);
  ip46_address_is_ip4 (ip) ?
    hash_set (gtpu_main.vtep4, ip->ip4.as_u32, 1) :
    hash_set_key_copy (&gtpu_main.vtep6, &ip->ip6, 1);
  return 1;
}

static uword
vtep_addr_unref (ip46_address_t * ip)
{
  uword *vtep = ip46_address_is_ip4 (ip) ?
    hash_get (gtpu_main.vtep4, ip->ip4.as_u32) :
    hash_get_mem (gtpu_main.vtep6, &ip->ip6);
  ASSERT (vtep);
  if (--(*vtep) != 0)
    return *vtep;
  ip46_address_is_ip4 (ip) ?
    hash_unset (gtpu_main.vtep4, ip->ip4.as_u32) :
    hash_unset_key_free (&gtpu_main.vtep6, &ip->ip6);
  return 0;
}

typedef CLIB_PACKED (union
		     {
		     struct
		     {
		     fib_node_index_t mfib_entry_index;
		     adj_index_t mcast_adj_index;
		     }; u64 as_u64;
		     }) mcast_shared_t;

static inline mcast_shared_t
mcast_shared_get (ip46_address_t * ip)
{
  ASSERT (ip46_address_is_multicast (ip));
  uword *p = hash_get_mem (gtpu_main.mcast_shared, ip);
  ASSERT (p);
  return (mcast_shared_t)
  {
  .as_u64 = *p};
}

static inline void
mcast_shared_add (ip46_address_t * dst, fib_node_index_t mfei, adj_index_t ai)
{
  mcast_shared_t new_ep = {
    .mcast_adj_index = ai,
    .mfib_entry_index = mfei,
  };

  hash_set_key_copy (&gtpu_main.mcast_shared, dst, new_ep.as_u64);
}

static inline void
mcast_shared_remove (ip46_address_t * dst)
{
  mcast_shared_t ep = mcast_shared_get (dst);

  adj_unlock (ep.mcast_adj_index);
  mfib_table_entry_delete_index (ep.mfib_entry_index, MFIB_SOURCE_GTPU);

  hash_unset_key_free (&gtpu_main.mcast_shared, dst);
}

static inline fib_protocol_t
fib_ip_proto (bool is_ip6)
{
  return (is_ip6) ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4;
}

int vnet_gtpu_add_del_tunnel
  (vnet_gtpu_add_del_tunnel_args_t * a, u32 * sw_if_indexp)
{
  gtpu_main_t *gtm = &gtpu_main;
  gtpu_tunnel_t *t = 0;
  vnet_main_t *vnm = gtm->vnet_main;
  uword *p;
  u32 hw_if_index = ~0;
  u32 sw_if_index = ~0;
  gtpu4_tunnel_key_t key4;
  gtpu6_tunnel_key_t key6;
  u32 is_ip6 = a->is_ip6;

  if (!is_ip6)
    {
      key4.src = a->dst.ip4.as_u32;	/* decap src in key is encap dst in config */
      key4.teid = clib_host_to_net_u32 (a->teid);
      p = hash_get (gtm->gtpu4_tunnel_by_key, key4.as_u64);
    }
  else
    {
      key6.src = a->dst.ip6;
      key6.teid = clib_host_to_net_u32 (a->teid);
      p = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6);
    }

  if (a->is_add)
    {
      l2input_main_t *l2im = &l2input_main;

      /* adding a tunnel: tunnel must not already exist */
      if (p)
	return VNET_API_ERROR_TUNNEL_EXIST;

      /*if not set explicitly, default to l2 */
      if (a->decap_next_index == ~0)
	a->decap_next_index = GTPU_INPUT_NEXT_L2_INPUT;
      if (!gtpu_decap_next_is_valid (gtm, is_ip6, a->decap_next_index))
	return VNET_API_ERROR_INVALID_DECAP_NEXT;

      pool_get_aligned (gtm->tunnels, t, CLIB_CACHE_LINE_BYTES);
      memset (t, 0, sizeof (*t));

      /* copy from arg structure */
#define _(x) t->x = a->x;
      foreach_copy_field;
#undef _

      ip_udp_gtpu_rewrite (t, is_ip6);

      /* copy the key */
      if (is_ip6)
	hash_set_key_copy (&gtm->gtpu6_tunnel_by_key, &key6,
			   t - gtm->tunnels);
      else
	hash_set (gtm->gtpu4_tunnel_by_key, key4.as_u64, t - gtm->tunnels);

      vnet_hw_interface_t *hi;
      if (vec_len (gtm->free_gtpu_tunnel_hw_if_indices) > 0)
	{
	  vnet_interface_main_t *im = &vnm->interface_main;
	  hw_if_index = gtm->free_gtpu_tunnel_hw_if_indices
	    [vec_len (gtm->free_gtpu_tunnel_hw_if_indices) - 1];
	  _vec_len (gtm->free_gtpu_tunnel_hw_if_indices) -= 1;

	  hi = vnet_get_hw_interface (vnm, hw_if_index);
	  hi->dev_instance = t - gtm->tunnels;
	  hi->hw_instance = hi->dev_instance;

	  /* clear old stats of freed tunnel before reuse */
	  sw_if_index = hi->sw_if_index;
	  vnet_interface_counter_lock (im);
	  vlib_zero_combined_counter
	    (&im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_TX],
	     sw_if_index);
	  vlib_zero_combined_counter (&im->combined_sw_if_counters
				      [VNET_INTERFACE_COUNTER_RX],
				      sw_if_index);
	  vlib_zero_simple_counter (&im->sw_if_counters
				    [VNET_INTERFACE_COUNTER_DROP],
				    sw_if_index);
	  vnet_interface_counter_unlock (im);
	}
      else
	{
	  hw_if_index = vnet_register_interface
	    (vnm, gtpu_device_class.index, t - gtm->tunnels,
	     gtpu_hw_class.index, t - gtm->tunnels);
	  hi = vnet_get_hw_interface (vnm, hw_if_index);
	}

      t->hw_if_index = hw_if_index;
      t->sw_if_index = sw_if_index = hi->sw_if_index;

      vec_validate_init_empty (gtm->tunnel_index_by_sw_if_index, sw_if_index,
			       ~0);
      gtm->tunnel_index_by_sw_if_index[sw_if_index] = t - gtm->tunnels;

      /* setup l2 input config with l2 feature and bd 0 to drop packet */
      vec_validate (l2im->configs, sw_if_index);
      l2im->configs[sw_if_index].feature_bitmap = L2INPUT_FEAT_DROP;
      l2im->configs[sw_if_index].bd_index = 0;

      vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
      si->flags &= ~VNET_SW_INTERFACE_FLAG_HIDDEN;
      vnet_sw_interface_set_flags (vnm, sw_if_index,
				   VNET_SW_INTERFACE_FLAG_ADMIN_UP);

      fib_node_init (&t->node, gtm->fib_node_type);
      fib_prefix_t tun_dst_pfx;
      u32 encap_index = !is_ip6 ?
	gtpu4_encap_node.index : gtpu6_encap_node.index;
      vnet_flood_class_t flood_class = VNET_FLOOD_CLASS_TUNNEL_NORMAL;

      fib_prefix_from_ip46_addr (&t->dst, &tun_dst_pfx);
      if (!ip46_address_is_multicast (&t->dst))
	{
	  /* Unicast tunnel -
	   * source the FIB entry for the tunnel's destination
	   * and become a child thereof. The tunnel will then get poked
	   * when the forwarding for the entry updates, and the tunnel can
	   * re-stack accordingly
	   */
	  vtep_addr_ref (&t->src);
	  t->fib_entry_index = fib_table_entry_special_add
	    (t->encap_fib_index, &tun_dst_pfx, FIB_SOURCE_RR,
	     FIB_ENTRY_FLAG_NONE);
	  t->sibling_index = fib_entry_child_add
	    (t->fib_entry_index, gtm->fib_node_type, t - gtm->tunnels);
	  gtpu_tunnel_restack_dpo (t);
	}
      else
	{
	  /* Multicast tunnel -
	   * as the same mcast group can be used for mutiple mcast tunnels
	   * with different VNIs, create the output fib adjecency only if
	   * it does not already exist
	   */
	  fib_protocol_t fp = fib_ip_proto (is_ip6);

	  if (vtep_addr_ref (&t->dst) == 1)
	    {
	      fib_node_index_t mfei;
	      adj_index_t ai;
	      fib_route_path_t path = {
		.frp_proto = fib_proto_to_dpo (fp),
		.frp_addr = zero_addr,
		.frp_sw_if_index = 0xffffffff,
		.frp_fib_index = ~0,
		.frp_weight = 0,
		.frp_flags = FIB_ROUTE_PATH_LOCAL,
	      };
	      const mfib_prefix_t mpfx = {
		.fp_proto = fp,
		.fp_len = (is_ip6 ? 128 : 32),
		.fp_grp_addr = tun_dst_pfx.fp_addr,
	      };

	      /*
	       * Setup the (*,G) to receive traffic on the mcast group
	       *  - the forwarding interface is for-us
	       *  - the accepting interface is that from the API
	       */
	      mfib_table_entry_path_update (t->encap_fib_index,
					    &mpfx,
					    MFIB_SOURCE_GTPU,
					    &path, MFIB_ITF_FLAG_FORWARD);

	      path.frp_sw_if_index = a->mcast_sw_if_index;
	      path.frp_flags = FIB_ROUTE_PATH_FLAG_NONE;
	      mfei = mfib_table_entry_path_update (t->encap_fib_index,
						   &mpfx,
						   MFIB_SOURCE_GTPU,
						   &path,
						   MFIB_ITF_FLAG_ACCEPT);

	      /*
	       * Create the mcast adjacency to send traffic to the group
	       */
	      ai = adj_mcast_add_or_lock (fp,
					  fib_proto_to_link (fp),
					  a->mcast_sw_if_index);

	      /*
	       * create a new end-point
	       */
	      mcast_shared_add (&t->dst, mfei, ai);
	    }

	  dpo_id_t dpo = DPO_INVALID;
	  mcast_shared_t ep = mcast_shared_get (&t->dst);

	  /* Stack shared mcast dst mac addr rewrite on encap */
	  dpo_set (&dpo, DPO_ADJACENCY_MCAST,
		   fib_proto_to_dpo (fp), ep.mcast_adj_index);

	  dpo_stack_from_node (encap_index, &t->next_dpo, &dpo);

	  dpo_reset (&dpo);
	  flood_class = VNET_FLOOD_CLASS_TUNNEL_MASTER;
	}

      /* Set gtpu tunnel output node */
      hi->output_node_index = encap_index;

      vnet_get_sw_interface (vnet_get_main (), sw_if_index)->flood_class =
	flood_class;
    }
  else
    {
      /* deleting a tunnel: tunnel must exist */
      if (!p)
	return VNET_API_ERROR_NO_SUCH_ENTRY;

      t = pool_elt_at_index (gtm->tunnels, p[0]);
      sw_if_index = t->sw_if_index;

      vnet_sw_interface_set_flags (vnm, t->sw_if_index, 0 /* down */ );
      vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, t->sw_if_index);
      si->flags |= VNET_SW_INTERFACE_FLAG_HIDDEN;

      /* make sure tunnel is removed from l2 bd or xconnect */
      set_int_l2_mode (gtm->vlib_main, vnm, MODE_L3, t->sw_if_index, 0, 0, 0,
		       0);
      vec_add1 (gtm->free_gtpu_tunnel_hw_if_indices, t->hw_if_index);

      gtm->tunnel_index_by_sw_if_index[t->sw_if_index] = ~0;

      if (!is_ip6)
	hash_unset (gtm->gtpu4_tunnel_by_key, key4.as_u64);
      else
	hash_unset_key_free (&gtm->gtpu6_tunnel_by_key, &key6);

      if (!ip46_address_is_multicast (&t->dst))
	{
	  vtep_addr_unref (&t->src);
	  fib_entry_child_remove (t->fib_entry_index, t->sibling_index);
	  fib_table_entry_delete_index (t->fib_entry_index, FIB_SOURCE_RR);
	}
      else if (vtep_addr_unref (&t->dst) == 0)
	{
	  mcast_shared_remove (&t->dst);
	}

      fib_node_deinit (&t->node);
      vec_free (t->rewrite);
      pool_put (gtm->tunnels, t);
    }

  if (sw_if_indexp)
    *sw_if_indexp = sw_if_index;

  return 0;
}

static uword
get_decap_next_for_node (u32 node_index, u32 ipv4_set)
{
  gtpu_main_t *gtm = &gtpu_main;
  vlib_main_t *vm = gtm->vlib_main;
  uword input_node = (ipv4_set) ? gtpu4_input_node.index :
    gtpu6_input_node.index;

  return vlib_node_add_next (vm, input_node, node_index);
}

static uword
unformat_decap_next (unformat_input_t * input, va_list * args)
{
  u32 *result = va_arg (*args, u32 *);
  u32 ipv4_set = va_arg (*args, int);
  gtpu_main_t *gtm = &gtpu_main;
  vlib_main_t *vm = gtm->vlib_main;
  u32 node_index;
  u32 tmp;

  if (unformat (input, "l2"))
    *result = GTPU_INPUT_NEXT_L2_INPUT;
  else if (unformat (input, "ip4"))
    *result = GTPU_INPUT_NEXT_IP4_INPUT;
  else if (unformat (input, "ip6"))
    *result = GTPU_INPUT_NEXT_IP6_INPUT;
  else if (unformat (input, "node %U", unformat_vlib_node, vm, &node_index))
    *result = get_decap_next_for_node (node_index, ipv4_set);
  else if (unformat (input, "%d", &tmp))
    *result = tmp;
  else
    return 0;

  return 1;
}

static clib_error_t *
gtpu_add_del_tunnel_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 src, dst;
  u8 is_add = 1;
  u8 src_set = 0;
  u8 dst_set = 0;
  u8 grp_set = 0;
  u8 ipv4_set = 0;
  u8 ipv6_set = 0;
  u32 encap_fib_index = 0;
  u32 mcast_sw_if_index = ~0;
  u32 decap_next_index = GTPU_INPUT_NEXT_L2_INPUT;
  u32 teid = 0;
  u32 tmp;
  int rv;
  vnet_gtpu_add_del_tunnel_args_t _a, *a = &_a;
  u32 tunnel_sw_if_index;
  clib_error_t *error = NULL;

  /* Cant "universally zero init" (={0}) due to GCC bug 53119 */
  memset (&src, 0, sizeof src);
  memset (&dst, 0, sizeof dst);

  /* Get a line of input. */
  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, "del"))
	{
	  is_add = 0;
	}
      else if (unformat (line_input, "src %U",
			 unformat_ip4_address, &src.ip4))
	{
	  src_set = 1;
	  ipv4_set = 1;
	}
      else if (unformat (line_input, "dst %U",
			 unformat_ip4_address, &dst.ip4))
	{
	  dst_set = 1;
	  ipv4_set = 1;
	}
      else if (unformat (line_input, "src %U",
			 unformat_ip6_address, &src.ip6))
	{
	  src_set = 1;
	  ipv6_set = 1;
	}
      else if (unformat (line_input, "dst %U",
			 unformat_ip6_address, &dst.ip6))
	{
	  dst_set = 1;
	  ipv6_set = 1;
	}
      else if (unformat (line_input, "group %U %U",
			 unformat_ip4_address, &dst.ip4,
			 unformat_vnet_sw_interface,
			 vnet_get_main (), &mcast_sw_if_index))
	{
	  grp_set = dst_set = 1;
	  ipv4_set = 1;
	}
      else if (unformat (line_input, "group %U %U",
			 unformat_ip6_address, &dst.ip6,
			 unformat_vnet_sw_interface,
			 vnet_get_main (), &mcast_sw_if_index))
	{
	  grp_set = dst_set = 1;
	  ipv6_set = 1;
	}
      else if (unformat (line_input, "encap-vrf-id %d", &tmp))
	{
	  encap_fib_index = fib_table_find (fib_ip_proto (ipv6_set), tmp);
	  if (encap_fib_index == ~0)
	    {
	      error =
		clib_error_return (0, "nonexistent encap-vrf-id %d", tmp);
	      goto done;
	    }
	}
      else if (unformat (line_input, "decap-next %U", unformat_decap_next,
			 &decap_next_index, ipv4_set))
	;
      else if (unformat (line_input, "teid %d", &teid))
	;
      else
	{
	  error = clib_error_return (0, "parse error: '%U'",
				     format_unformat_error, line_input);
	  goto done;
	}
    }

  if (src_set == 0)
    {
      error = clib_error_return (0, "tunnel src address not specified");
      goto done;
    }

  if (dst_set == 0)
    {
      error = clib_error_return (0, "tunnel dst address not specified");
      goto done;
    }

  if (grp_set && !ip46_address_is_multicast (&dst))
    {
      error = clib_error_return (0, "tunnel group address not multicast");
      goto done;
    }

  if (grp_set == 0 && ip46_address_is_multicast (&dst))
    {
      error = clib_error_return (0, "dst address must be unicast");
      goto done;
    }

  if (grp_set && mcast_sw_if_index == ~0)
    {
      error = clib_error_return (0, "tunnel nonexistent multicast device");
      goto done;
    }

  if (ipv4_set && ipv6_set)
    {
      error = clib_error_return (0, "both IPv4 and IPv6 addresses specified");
      goto done;
    }

  if (ip46_address_cmp (&src, &dst) == 0)
    {
      error = clib_error_return (0, "src and dst addresses are identical");
      goto done;
    }

  if (decap_next_index == ~0)
    {
      error = clib_error_return (0, "next node not found");
      goto done;
    }

  memset (a, 0, sizeof (*a));

  a->is_add = is_add;
  a->is_ip6 = ipv6_set;

#define _(x) a->x = x;
  foreach_copy_field;
#undef _

  rv = vnet_gtpu_add_del_tunnel (a, &tunnel_sw_if_index);

  switch (rv)
    {
    case 0:
      if (is_add)
	vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name,
			 vnet_get_main (), tunnel_sw_if_index);
      break;

    case VNET_API_ERROR_TUNNEL_EXIST:
      error = clib_error_return (0, "tunnel already exists...");
      goto done;

    case VNET_API_ERROR_NO_SUCH_ENTRY:
      error = clib_error_return (0, "tunnel does not exist...");
      goto done;

    default:
      error = clib_error_return
	(0, "vnet_gtpu_add_del_tunnel returned %d", rv);
      goto done;
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * Add or delete a GTPU Tunnel.
 *
 * GTPU provides the features needed to allow L2 bridge domains (BDs)
 * to span multiple servers. This is done by building an L2 overlay on
 * top of an L3 network underlay using GTPU tunnels.
 *
 * This makes it possible for servers to be co-located in the same data
 * center or be separated geographically as long as they are reachable
 * through the underlay L3 network.
 *
 * You can refer to this kind of L2 overlay bridge domain as a GTPU
 * (Virtual eXtensible VLAN) segment.
 *
 * @cliexpar
 * Example of how to create a GTPU Tunnel:
 * @cliexcmd{create gtpu tunnel src 10.0.3.1 dst 10.0.3.3 teid 13 encap-vrf-id 7}
 * Example of how to delete a GTPU Tunnel:
 * @cliexcmd{create gtpu tunnel src 10.0.3.1 dst 10.0.3.3 teid 13 del}
 ?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (create_gtpu_tunnel_command, static) = {
  .path = "create gtpu tunnel",
  .short_help =
  "create gtpu tunnel src <local-vtep-addr>"
  " {dst <remote-vtep-addr>|group <mcast-vtep-addr> <intf-name>} teid <nn>"
  " [encap-vrf-id <nn>] [decap-next [l2|ip4|ip6|node <name>]] [del]",
  .function = gtpu_add_del_tunnel_command_fn,
};
/* *INDENT-ON* */

static clib_error_t *
show_gtpu_tunnel_command_fn (vlib_main_t * vm,
			     unformat_input_t * input,
			     vlib_cli_command_t * cmd)
{
  gtpu_main_t *gtm = &gtpu_main;
  gtpu_tunnel_t *t;

  if (pool_elts (gtm->tunnels) == 0)
    vlib_cli_output (vm, "No gtpu tunnels configured...");

  pool_foreach (t, gtm->tunnels, (
				   {
				   vlib_cli_output (vm, "%U",
						    format_gtpu_tunnel, t);
				   }
		));

  return 0;
}

/*?
 * Display all the GTPU Tunnel entries.
 *
 * @cliexpar
 * Example of how to display the GTPU Tunnel entries:
 * @cliexstart{show gtpu tunnel}
 * [0] src 10.0.3.1 dst 10.0.3.3 teid 13 encap_fib_index 0 sw_if_index 5 decap_next l2
 * @cliexend
 ?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_gtpu_tunnel_command, static) = {
    .path = "show gtpu tunnel",
    .short_help = "show gtpu tunnel",
    .function = show_gtpu_tunnel_command_fn,
};
/* *INDENT-ON* */

void
vnet_int_gtpu_bypass_mode (u32 sw_if_index, u8 is_ip6, u8 is_enable)
{
  if (is_ip6)
    vnet_feature_enable_disable ("ip6-unicast", "ip6-gtpu-bypass",
				 sw_if_index, is_enable, 0, 0);
  else
    vnet_feature_enable_disable ("ip4-unicast", "ip4-gtpu-bypass",
				 sw_if_index, is_enable, 0, 0);
}

static clib_error_t *
set_ip_gtpu_bypass (u32 is_ip6,
		    unformat_input_t * input, vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  vnet_main_t *vnm = vnet_get_main ();
  clib_error_t *error = 0;
  u32 sw_if_index, is_enable;

  sw_if_index = ~0;
  is_enable = 1;

  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat_user
	  (line_input, unformat_vnet_sw_interface, vnm, &sw_if_index))
	;
      else if (unformat (line_input, "del"))
	is_enable = 0;
      else
	{
	  error = unformat_parse_error (line_input);
	  goto done;
	}
    }

  if (~0 == sw_if_index)
    {
      error = clib_error_return (0, "unknown interface `%U'",
				 format_unformat_error, line_input);
      goto done;
    }

  vnet_int_gtpu_bypass_mode (sw_if_index, is_ip6, is_enable);

done:
  unformat_free (line_input);

  return error;
}

static clib_error_t *
set_ip4_gtpu_bypass (vlib_main_t * vm,
		     unformat_input_t * input, vlib_cli_command_t * cmd)
{
  return set_ip_gtpu_bypass (0, input, cmd);
}

/*?
 * This command adds the 'ip4-gtpu-bypass' graph node for a given interface.
 * By adding the IPv4 gtpu-bypass graph node to an interface, the node checks
 *  for and validate input gtpu packet and bypass ip4-lookup, ip4-local,
 * ip4-udp-lookup nodes to speedup gtpu packet forwarding. This node will
 * cause extra overhead to for non-gtpu packets which is kept at a minimum.
 *
 * @cliexpar
 * @parblock
 * Example of graph node before ip4-gtpu-bypass is enabled:
 * @cliexstart{show vlib graph ip4-gtpu-bypass}
 *            Name                      Next                    Previous
 * ip4-gtpu-bypass                error-drop [0]
 *                                gtpu4-input [1]
 *                                 ip4-lookup [2]
 * @cliexend
 *
 * Example of how to enable ip4-gtpu-bypass on an interface:
 * @cliexcmd{set interface ip gtpu-bypass GigabitEthernet2/0/0}
 *
 * Example of graph node after ip4-gtpu-bypass is enabled:
 * @cliexstart{show vlib graph ip4-gtpu-bypass}
 *            Name                      Next                    Previous
 * ip4-gtpu-bypass                error-drop [0]               ip4-input
 *                                gtpu4-input [1]        ip4-input-no-checksum
 *                                 ip4-lookup [2]
 * @cliexend
 *
 * Example of how to display the feature enabed on an interface:
 * @cliexstart{show ip interface features GigabitEthernet2/0/0}
 * IP feature paths configured on GigabitEthernet2/0/0...
 * ...
 * ipv4 unicast:
 *   ip4-gtpu-bypass
 *   ip4-lookup
 * ...
 * @cliexend
 *
 * Example of how to disable ip4-gtpu-bypass on an interface:
 * @cliexcmd{set interface ip gtpu-bypass GigabitEthernet2/0/0 del}
 * @endparblock
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_interface_ip_gtpu_bypass_command, static) = {
  .path = "set interface ip gtpu-bypass",
  .function = set_ip4_gtpu_bypass,
  .short_help = "set interface ip gtpu-bypass <interface> [del]",
};
/* *INDENT-ON* */

static clib_error_t *
set_ip6_gtpu_bypass (vlib_main_t * vm,
		     unformat_input_t * input, vlib_cli_command_t * cmd)
{
  return set_ip_gtpu_bypass (1, input, cmd);
}

/*?
 * This command adds the 'ip6-gtpu-bypass' graph node for a given interface.
 * By adding the IPv6 gtpu-bypass graph node to an interface, the node checks
 *  for and validate input gtpu packet and bypass ip6-lookup, ip6-local,
 * ip6-udp-lookup nodes to speedup gtpu packet forwarding. This node will
 * cause extra overhead to for non-gtpu packets which is kept at a minimum.
 *
 * @cliexpar
 * @parblock
 * Example of graph node before ip6-gtpu-bypass is enabled:
 * @cliexstart{show vlib graph ip6-gtpu-bypass}
 *            Name                      Next                    Previous
 * ip6-gtpu-bypass                error-drop [0]
 *                                gtpu6-input [1]
 *                                 ip6-lookup [2]
 * @cliexend
 *
 * Example of how to enable ip6-gtpu-bypass on an interface:
 * @cliexcmd{set interface ip6 gtpu-bypass GigabitEthernet2/0/0}
 *
 * Example of graph node after ip6-gtpu-bypass is enabled:
 * @cliexstart{show vlib graph ip6-gtpu-bypass}
 *            Name                      Next                    Previous
 * ip6-gtpu-bypass                error-drop [0]               ip6-input
 *                                gtpu6-input [1]        ip4-input-no-checksum
 *                                 ip6-lookup [2]
 * @cliexend
 *
 * Example of how to display the feature enabed on an interface:
 * @cliexstart{show ip interface features GigabitEthernet2/0/0}
 * IP feature paths configured on GigabitEthernet2/0/0...
 * ...
 * ipv6 unicast:
 *   ip6-gtpu-bypass
 *   ip6-lookup
 * ...
 * @cliexend
 *
 * Example of how to disable ip6-gtpu-bypass on an interface:
 * @cliexcmd{set interface ip6 gtpu-bypass GigabitEthernet2/0/0 del}
 * @endparblock
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_interface_ip6_gtpu_bypass_command, static) = {
  .path = "set interface ip6 gtpu-bypass",
  .function = set_ip6_gtpu_bypass,
  .short_help = "set interface ip gtpu-bypass <interface> [del]",
};
/* *INDENT-ON* */

clib_error_t *
gtpu_init (vlib_main_t * vm)
{
  gtpu_main_t *gtm = &gtpu_main;

  gtm->vnet_main = vnet_get_main ();
  gtm->vlib_main = vm;

  /* initialize the ip6 hash */
  gtm->gtpu6_tunnel_by_key = hash_create_mem (0,
					      sizeof (gtpu6_tunnel_key_t),
					      sizeof (uword));
  gtm->vtep6 = hash_create_mem (0, sizeof (ip6_address_t), sizeof (uword));
  gtm->mcast_shared = hash_create_mem (0,
				       sizeof (ip46_address_t),
				       sizeof (mcast_shared_t));

  udp_register_dst_port (vm, UDP_DST_PORT_GTPU,
			 gtpu4_input_node.index, /* is_ip4 */ 1);
  udp_register_dst_port (vm, UDP_DST_PORT_GTPU6,
			 gtpu6_input_node.index, /* is_ip4 */ 0);

  gtm->fib_node_type = fib_node_register_new_type (&gtpu_vft);

  return 0;
}

VLIB_INIT_FUNCTION (gtpu_init);

/* *INDENT-OFF* */
VLIB_PLUGIN_REGISTER () = {
    .version = VPP_BUILD_VER,
    .description = "GTPv1-U",
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */