/*
 * node.c: gre packet processing
 *
 * 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.
 */

#include <vlib/vlib.h>
#include <vnet/pg/pg.h>
#include <vnet/gre/gre.h>
#include <vnet/mpls/mpls.h>
#include <vppinfra/sparse_vec.h>

#define foreach_gre_input_next			\
_(PUNT, "error-punt")                           \
_(DROP, "error-drop")                           \
_(ETHERNET_INPUT, "ethernet-input")             \
_(IP4_INPUT, "ip4-input")                       \
_(IP6_INPUT, "ip6-input")			\
_(MPLS_INPUT, "mpls-input")

typedef enum
{
#define _(s,n) GRE_INPUT_NEXT_##s,
  foreach_gre_input_next
#undef _
    GRE_INPUT_N_NEXT,
} gre_input_next_t;

typedef struct
{
  u32 tunnel_id;
  u32 length;
  ip46_address_t src;
  ip46_address_t dst;
} gre_rx_trace_t;

extern u8 *format_gre_rx_trace (u8 * s, va_list * args);

#ifndef CLIB_MARCH_VARIANT
u8 *
format_gre_rx_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  gre_rx_trace_t *t = va_arg (*args, gre_rx_trace_t *);

  s = format (s, "GRE: tunnel %d len %d src %U dst %U",
	      t->tunnel_id, clib_net_to_host_u16 (t->length),
	      format_ip46_address, &t->src, IP46_TYPE_ANY,
	      format_ip46_address, &t->dst, IP46_TYPE_ANY);
  return s;
}
#endif /* CLIB_MARCH_VARIANT */

typedef struct
{
  /* Sparse vector mapping gre protocol in network byte order
     to next index. */
  u16 *next_by_protocol;
} gre_input_runtime_t;

always_inline void
gre_trace (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_buffer_t * b,
	   u32 tun_sw_if_index, const ip6_header_t * ip6,
	   const ip4_header_t * ip4, int is_ipv6)
{
  gre_rx_trace_t *tr = vlib_add_trace (vm, node,
				       b, sizeof (*tr));
  tr->tunnel_id = tun_sw_if_index;
  if (is_ipv6)
    {
      tr->length = ip6->payload_length;
      tr->src.ip6.as_u64[0] = ip6->src_address.as_u64[0];
      tr->src.ip6.as_u64[1] = ip6->src_address.as_u64[1];
      tr->dst.ip6.as_u64[0] = ip6->dst_address.as_u64[0];
      tr->dst.ip6.as_u64[1] = ip6->dst_address.as_u64[1];
    }
  else
    {
      tr->length = ip4->length;
      tr->src.as_u64[0] = tr->src.as_u64[1] = 0;
      tr->dst.as_u64[0] = tr->dst.as_u64[1] = 0;
      tr->src.ip4.as_u32 = ip4->src_address.as_u32;
      tr->dst.ip4.as_u32 = ip4->dst_address.as_u32;
    }
}

always_inline void
gre_tunnel_get (const gre_main_t * gm, vlib_node_runtime_t * node,
		vlib_buffer_t * b, u16 * next, const gre_tunnel_key_t * key,
		gre_tunnel_key_t * cached_key, u32 * tun_sw_if_index,
		u32 * cached_tun_sw_if_index, int is_ipv6)
{
  const uword *p;
  p = is_ipv6 ? hash_get_mem (gm->tunnel_by_key6, &key->gtk_v6)
    : hash_get_mem (gm->tunnel_by_key4, &key->gtk_v4);
  if (PREDICT_FALSE (!p))
    {
      *next = GRE_INPUT_NEXT_DROP;
      b->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
      *tun_sw_if_index = ~0;
    }
  else
    {
      const gre_tunnel_t *tun;
      tun = pool_elt_at_index (gm->tunnels, *p);
      *cached_tun_sw_if_index = *tun_sw_if_index = tun->sw_if_index;
      if (is_ipv6)
	cached_key->gtk_v6 = key->gtk_v6;
      else
	cached_key->gtk_v4 = key->gtk_v4;
    }
}

always_inline uword
gre_input (vlib_main_t * vm,
	   vlib_node_runtime_t * node, vlib_frame_t * frame,
	   const int is_ipv6)
{
  gre_main_t *gm = &gre_main;
  u32 *from, n_left_from;
  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
  u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
  u16 cached_protocol = ~0;
  u32 cached_next_index = SPARSE_VEC_INVALID_INDEX;
  u32 cached_tun_sw_if_index = ~0;
  gre_tunnel_key_t cached_key;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  vlib_get_buffers (vm, from, bufs, n_left_from);

  if (is_ipv6)
    clib_memset (&cached_key.gtk_v6, 0xff, sizeof (cached_key.gtk_v6));
  else
    clib_memset (&cached_key.gtk_v4, 0xff, sizeof (cached_key.gtk_v4));

  while (n_left_from >= 2)
    {
      const ip6_header_t *ip6[2];
      const ip4_header_t *ip4[2];
      const gre_header_t *gre[2];
      u32 nidx[2];
      next_info_t ni[2];
      u8 type[2];
      u16 version[2];
      u32 len[2];
      gre_tunnel_key_t key[2];
      u8 matched[2];
      u32 tun_sw_if_index[2];

      if (PREDICT_TRUE (n_left_from >= 6))
	{
	  vlib_prefetch_buffer_data (b[2], LOAD);
	  vlib_prefetch_buffer_data (b[3], LOAD);
	  vlib_prefetch_buffer_header (b[4], STORE);
	  vlib_prefetch_buffer_header (b[5], STORE);
	}

      if (is_ipv6)
	{
	  /* ip6_local hands us the ip header, not the gre header */
	  ip6[0] = vlib_buffer_get_current (b[0]);
	  ip6[1] = vlib_buffer_get_current (b[1]);
	  gre[0] = (void *) (ip6[0] + 1);
	  gre[1] = (void *) (ip6[1] + 1);
	  vlib_buffer_advance (b[0], sizeof (*ip6[0]) + sizeof (*gre[0]));
	  vlib_buffer_advance (b[1], sizeof (*ip6[0]) + sizeof (*gre[0]));
	}
      else
	{
	  /* ip4_local hands us the ip header, not the gre header */
	  ip4[0] = vlib_buffer_get_current (b[0]);
	  ip4[1] = vlib_buffer_get_current (b[1]);
	  gre[0] = (void *) (ip4[0] + 1);
	  gre[1] = (void *) (ip4[1] + 1);
	  vlib_buffer_advance (b[0], sizeof (*ip4[0]) + sizeof (*gre[0]));
	  vlib_buffer_advance (b[1], sizeof (*ip4[0]) + sizeof (*gre[0]));
	}

      if (PREDICT_TRUE (cached_protocol == gre[0]->protocol))
	{
	  nidx[0] = cached_next_index;
	}
      else
	{
	  cached_next_index = nidx[0] =
	    sparse_vec_index (gm->next_by_protocol, gre[0]->protocol);
	  cached_protocol = gre[0]->protocol;
	}
      if (PREDICT_TRUE (cached_protocol == gre[1]->protocol))
	{
	  nidx[1] = cached_next_index;
	}
      else
	{
	  cached_next_index = nidx[1] =
	    sparse_vec_index (gm->next_by_protocol, gre[1]->protocol);
	  cached_protocol = gre[1]->protocol;
	}

      ni[0] = vec_elt (gm->next_by_protocol, nidx[0]);
      ni[1] = vec_elt (gm->next_by_protocol, nidx[1]);
      next[0] = ni[0].next_index;
      next[1] = ni[1].next_index;
      type[0] = ni[0].tunnel_type;
      type[1] = ni[1].tunnel_type;

      b[0]->error = nidx[0] == SPARSE_VEC_INVALID_INDEX
	? node->errors[GRE_ERROR_UNKNOWN_PROTOCOL]
	: node->errors[GRE_ERROR_NONE];
      b[1]->error = nidx[1] == SPARSE_VEC_INVALID_INDEX
	? node->errors[GRE_ERROR_UNKNOWN_PROTOCOL]
	: node->errors[GRE_ERROR_NONE];

      version[0] = clib_net_to_host_u16 (gre[0]->flags_and_version);
      version[1] = clib_net_to_host_u16 (gre[1]->flags_and_version);
      version[0] &= GRE_VERSION_MASK;
      version[1] &= GRE_VERSION_MASK;

      b[0]->error = version[0]
	? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[0]->error;
      next[0] = version[0] ? GRE_INPUT_NEXT_DROP : next[0];
      b[1]->error = version[1]
	? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[1]->error;
      next[1] = version[1] ? GRE_INPUT_NEXT_DROP : next[1];

      len[0] = vlib_buffer_length_in_chain (vm, b[0]);
      len[1] = vlib_buffer_length_in_chain (vm, b[1]);

      /* always search for P2P types in the DP */
      if (is_ipv6)
	{
	  gre_mk_key6 (&ip6[0]->dst_address,
		       &ip6[0]->src_address,
		       vnet_buffer (b[0])->ip.fib_index,
		       type[0], TUNNEL_MODE_P2P, 0, &key[0].gtk_v6);
	  gre_mk_key6 (&ip6[1]->dst_address,
		       &ip6[1]->src_address,
		       vnet_buffer (b[1])->ip.fib_index,
		       type[1], TUNNEL_MODE_P2P, 0, &key[1].gtk_v6);
	  matched[0] = gre_match_key6 (&cached_key.gtk_v6, &key[0].gtk_v6);
	  matched[1] = gre_match_key6 (&cached_key.gtk_v6, &key[1].gtk_v6);
	}
      else
	{
	  gre_mk_key4 (ip4[0]->dst_address,
		       ip4[0]->src_address,
		       vnet_buffer (b[0])->ip.fib_index,
		       type[0], TUNNEL_MODE_P2P, 0, &key[0].gtk_v4);
	  gre_mk_key4 (ip4[1]->dst_address,
		       ip4[1]->src_address,
		       vnet_<style>.highlight .hll { background-color: #ffffcc }
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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span># -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure(2) do |config|

  # Pick the right distro and bootstrap, default is ubuntu1604
  distro = ( ENV[&#39;VPP_VAGRANT_DISTRO&#39;] || &quot;ubuntu1604&quot;)
  if distro == &#39;centos7&#39;
    config.vm.box = &quot;centos/7&quot;
    config.vm.box_version = &quot;1708.01&quot;
    config.ssh.insert_key = false
  elsif distro == &#39;ubuntu1804&#39;
    config.vm.box = &quot;bento/ubuntu-18.04&quot;
  else
    config.vm.box = &quot;puppetlabs/ubuntu-16.04-64-nocm&quot;
  end
  config.vm.box_check_update = false

  config.vm.provision :shell, :path =&gt; File.join(File.dirname(__FILE__),&quot;update.sh&quot;)
  config.vm.provision :shell, :path =&gt; File.join(File.dirname(__FILE__),&quot;build.sh&quot;), :args =&gt; &quot;/vpp vagrant&quot;

  post_build = ( ENV[&#39;VPP_VAGRANT_POST_BUILD&#39;] )
  if post_build == &quot;test&quot;
    config.vm.provision &quot;shell&quot;, inline: &quot;echo Testing VPP; cd /vpp; make test&quot;
  elsif post_build == &quot;install&quot;
    config.vm.provision :shell, :path =&gt; File.join(File.dirname(__FILE__),&quot;install.sh&quot;), :args =&gt; &quot;/vpp&quot;
    config.vm.provision :shell, :path =&gt; File.join(File.dirname(__FILE__),&quot;clearinterfaces.sh&quot;)
    config.vm.provision :shell, :path =&gt; File.join(File.dirname(__FILE__),&quot;run.sh&quot;)
  end

  # Add .gnupg dir in so folks can sign patches
  # Note, as gnupg puts socket files in that dir, we have
  # to be cautious and make sure we are dealing with a plain file
  homedir = File.expand_path(&quot;~/&quot;)
  Dir[&quot;#{homedir}/.gnupg/**/*&quot;].each do |fname|
    if File.file?(fname)
      destname = fname.sub(Regexp.escape(&quot;#{homedir}/&quot;),&#39;&#39;)
      config.vm.provision &quot;file&quot;, source: fname, destination: destname
    end
  end

  # Copy in the .gitconfig if it exists
  if File.file?(File.expand_path(&quot;~/.gitconfig&quot;))
    config.vm.provision  &quot;file&quot;, source: &quot;~/.gitconfig&quot;, destination: &quot;.gitconfig&quot;
  end

  # vagrant-cachier caches apt/yum etc to speed subsequent
  # vagrant up
  # to enable, run
  # vagrant plugin install vagrant-cachier
  #
  if Vagrant.has_plugin?(&quot;vagrant-cachier&quot;)
    config.cache.scope = :box
  end

  # Define some physical ports for your VMs to be used by DPDK
  nics = (ENV[&#39;VPP_VAGRANT_NICS&#39;] || &quot;2&quot;).to_i(10)
  for i in 1..nics
    config.vm.network &quot;private_network&quot;, type: &quot;dhcp&quot;
  end

  # use http proxy if avaiable
  if ENV[&#39;http_proxy&#39;] &amp;&amp; Vagrant.has_plugin?(&quot;vagrant-proxyconf&quot;)
   config.proxy.http     = ENV[&#39;http_proxy&#39;]
   config.proxy.https    = ENV[&#39;https_proxy&#39;]
   config.proxy.no_proxy = &quot;localhost,127.0.0.1&quot;
  end

  vmcpu=(ENV[&#39;VPP_VAGRANT_VMCPU&#39;] || 2)
  vmram=(ENV[&#39;VPP_VAGRANT_VMRAM&#39;] || 4096)

  config.ssh.forward_agent = true
  config.ssh.forward_x11 = true

  config.vm.provider &quot;virtualbox&quot; do |vb|
      vb.customize [&quot;modifyvm&quot;, :id, &quot;--ioapic&quot;, &quot;on&quot;]
      vb.memory = &quot;#{vmram}&quot;
      vb.cpus = &quot;#{vmcpu}&quot;

      # rsync the vpp directory if provision hasn&#39;t happened yet
      unless File.exist? (&quot;.vagrant/machines/default/virtualbox/action_provision&quot;)
        config.vm.synced_folder &quot;../../&quot;, &quot;/vpp&quot;, type: &quot;rsync&quot;,
         rsync__auto: false,
         rsync__exclude: [
          &quot;build-root/build*/&quot;,
          &quot;build-root/install*/&quot;,
          &quot;build-root/images*/&quot;,
          &quot;build-root/*.deb&quot;,
          &quot;build-root/*.rpm&quot;,
          &quot;build-root/*.changes&quot;,
          &quot;build-root/python&quot;,
          &quot;build-root/deb/debian/*.dkms&quot;,
          &quot;build-root/deb/debian/*.install&quot;,
          &quot;build-root/deb/debian/changes&quot;,
          &quot;build-root/tools&quot;]
      end

      #support for the SSE4.x instruction is required in some versions of VB.
      vb.customize [&quot;setextradata&quot;, :id, &quot;VBoxInternal/CPUM/SSE4.1&quot;, &quot;1&quot;]
      vb.customize [&quot;setextradata&quot;, :id, &quot;VBoxInternal/CPUM/SSE4.2&quot;, &quot;1&quot;]
  end
  config.vm.provider &quot;vmware_fusion&quot; do |fusion,override|
    fusion.vmx[&quot;memsize&quot;] = &quot;#{vmram}&quot;
    fusion.vmx[&quot;numvcpus&quot;] = &quot;#{vmcpu}&quot;
  end
  config.vm.provider &quot;libvirt&quot; do |lv|
    lv.memory = &quot;#{vmram}&quot;
    lv.cpus = &quot;#{vmcpu}&quot;
  end
  config.vm.provider &quot;vmware_workstation&quot; do |vws,override|
    vws.vmx[&quot;memsize&quot;]