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path: root/src/vnet/ipip/sixrd.c
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#!/usr/bin/env python3

import os
import unittest

from framework import VppTestCase, VppTestRunner, running_gcov_tests
from vpp_ip_route import VppIpTable, VppIpRoute, VppRoutePath


class TestPcap(VppTestCase):
    """ Pcap Unit Test Cases """

    @classmethod
    def setUpClass(cls):
        super(TestPcap, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestPcap, cls).tearDownClass()

    def setUp(self):
        super(TestPcap, self).setUp()

    def tearDown(self):
        super(TestPcap, self).tearDown()

# This is a code coverage test, but it only runs for 0.3 seconds
# might as well just run it...
    def test_pcap_unittest(self):
        """ PCAP Capture Tests """
        cmds = ["loop create",
                "set int ip address loop0 11.22.33.1/24",
                "set int state loop0 up",
                "loop create",
                "set int ip address loop1 11.22.34.1/24",
                "set int state loop1 up",
                "set ip neighbor loop1 11.22.34.44 03:00:11:22:34:44",
                "packet-generator new {\n"
                "  name s0\n"
                "  limit 10\n"
                "  size 128-128\n"
                "  interface loop0\n"
                "  tx-interface loop1\n"
                "  node loop1-output\n"
                "  buffer-flags ip4 offload\n"
                "  buffer-offload-flags offload-ip-cksum offload-udp-cksum\n"
                "  data {\n"
                "    IP4: 1.2.3 -> dead.0000.0001\n"
                "    UDP: 11.22.33.44 -> 11.22.34.44\n"
                "      ttl 2 checksum 13\n"
                "    UDP: 1234 -> 2345\n"
                "      checksum 11\n"
                "    incrementing 114\n"
                "  }\n"
                "}",
                "pcap dispatch trace on max 100 buffer-trace pg-input 10",
                "pa en",
                "pcap dispatch trace off",
                "pcap trace rx tx max 1000 intfc any",
                "pa en",
                "pcap trace status",
                "pcap trace rx tx off",
                "classify filter pcap mask l3 ip4 src "
                "match l3 ip4 src 11.22.33.44",
                "pcap trace rx tx max 1000 intfc any file filt.pcap filter",
                "show cla t verbose 2",
                "show cla t verbose",
                "show cla t",
                "pa en",
                "pcap trace rx tx off",
                "classify filter pcap del mask l3 ip4 src"]

        for cmd in cmds:
            r = self.vapi.cli_return_response(cmd)
            if r.retval != 0:
                if hasattr(r, 'reply'):
                    self.logger.info(cmd + " FAIL reply " + r.reply)
                else:
                    self.logger.info(cmd + " FAIL retval " + str(r.retval))

        self.assertTrue(os.path.exists('/tmp/dispatch.pcap'))
        self.assertTrue(os.path.exists('/tmp/rxtx.pcap'))
        self.assertTrue(os.path.exists('/tmp/filt.pcap'))
        os.remove('/tmp/dispatch.pcap')
        os.remove('/tmp/rxtx.pcap')
        os.remove('/tmp/filt.pcap')


if __name__ == '__main__':
    unittest.main(testRunner=VppTestRunner)
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/*
 * sixrd.c - 6RD specific functions (RFC5969)
 *
 * Copyright (c) 2018 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.
 */

/**
 * This code supports the following sixrd modes:
 *
 * 32 EA bits (Complete IPv4 address is embedded):
 *   ea_bits_len = 32
 * IPv4 suffix is embedded:
 *   ea_bits_len = < 32
 * No embedded address bits (1:1 mode):
 *   ea_bits_len = 0
 */

#include "ipip.h"
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vnet/adj/adj.h>
#include <vnet/adj/adj_delegate.h>
#include <vnet/adj/adj_midchain.h>
#include <vnet/dpo/lookup_dpo.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/plugin/plugin.h>

extern vlib_node_registration_t ip4_sixrd_node;

/**
 * Adj delegate data
 */
typedef struct sixrd_adj_delegate_t_
{
  u32 adj_index;
  fib_node_t sixrd_node;
  fib_node_index_t sixrd_fib_entry_index;
  u32 sixrd_sibling;
} sixrd_adj_delegate_t;

/**
 * Pool of delegate structs
 */
static sixrd_adj_delegate_t *sixrd_adj_delegate_pool;

/**
 * Adj delegate registered type
 */
static adj_delegate_type_t sixrd_adj_delegate_type;

/**
 * FIB node registered type
 */
static fib_node_type_t sixrd_fib_node_type;

static inline sixrd_adj_delegate_t *
sixrd_adj_from_base (adj_delegate_t * ad)
{
  if (ad == NULL)
    return (NULL);
  return (pool_elt_at_index (sixrd_adj_delegate_pool, ad->ad_index));
}

static inline const sixrd_adj_delegate_t *
sixrd_adj_from_const_base (const adj_delegate_t * ad)
{
  if (ad == NULL)
    {
      return (NULL);
    }
  return (pool_elt_at_index (sixrd_adj_delegate_pool, ad->ad_index));
}

static void
sixrd_fixup (vlib_main_t * vm, ip_adjacency_t * adj, vlib_buffer_t * b0,
	     const void *data)
{
  ip4_header_t *ip4 = vlib_buffer_get_current (b0);
  ip6_header_t *ip6 = vlib_buffer_get_current (b0) + sizeof (ip4_header_t);
  const ipip_tunnel_t *t = data;

  ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
  ip4->dst_address.as_u32 =
    sixrd_get_addr_net (t, ip6->dst_address.as_u64[0]);
  ip4->checksum = ip4_header_checksum (ip4);
}

static void
ip6ip_fixup (vlib_main_t * vm, ip_adjacency_t * adj, vlib_buffer_t * b0,
	     const void *data)
{
  const ipip_tunnel_t *t = data;
  ip4_header_t *ip4 = vlib_buffer_get_current (b0);
  ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
  ip4->dst_address.as_u32 =
    sixrd_get_addr_net (t, adj->sub_type.nbr.next_hop.as_u64[0]);
  ip4->checksum = ip4_header_checksum (ip4);
}

static u8 *
sixrd_build_rewrite (vnet_main_t * vnm, u32 sw_if_index,
		     vnet_link_t link_type, const void *dst_address)
{
  u8 *rewrite = NULL;
  ipip_tunnel_t *t;

  t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
  if (!t)
    return 0;

  vec_validate (rewrite, sizeof (ip4_header_t) - 1);
  ip4_header_t *ip4 = (ip4_header_t *) rewrite;
  ip4->ip_version_and_header_length = 0x45;
  ip4->ttl = 64;
  ip4->protocol = IP_PROTOCOL_IPV6;
  /* fixup ip4 header length and checksum after-the-fact */
  ip4->src_address.as_u32 = t->tunnel_src.ip4.as_u32;
  ip4->dst_address.as_u32 = 0;
  ip4->checksum = ip4_header_checksum (ip4);

  return rewrite;
}

static void
ip6ip_tunnel_stack (adj_index_t ai, u32 fib_entry_index)
{
  ip_adjacency_t *adj = adj_get (ai);
  ipip_tunnel_t *t;
  u32 sw_if_index = adj->rewrite_header.sw_if_index;

  t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
  if (!t)
    return;

  /*
   * find the adjacency that is contributed by the FIB entry
   * that this tunnel resolves via, and use it as the next adj
   * in the midchain
   */
  if (vnet_hw_interface_get_flags (vnet_get_main (), t->hw_if_index) &
      VNET_HW_INTERFACE_FLAG_LINK_UP)
    {
      adj_nbr_midchain_stack (ai,
			      fib_entry_contribute_ip_forwarding
			      (fib_entry_index));
    }
  else
    {
      adj_nbr_midchain_unstack (ai);
    }
}

static void
sixrd_tunnel_stack (adj_index_t ai, u32 fib_index)
{
  dpo_id_t dpo = DPO_INVALID;
  ip_adjacency_t *adj = adj_get (ai);
  u32 sw_if_index = adj->rewrite_header.sw_if_index;

  ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
  if (!t)
    return;

  lookup_dpo_add_or_lock_w_fib_index (fib_index, DPO_PROTO_IP4,
				      LOOKUP_UNICAST, LOOKUP_INPUT_DST_ADDR,
				      LOOKUP_TABLE_FROM_CONFIG, &dpo);
  adj_nbr_midchain_stack (ai, &dpo);
}

const static ip46_address_t sixrd_special_nh = {
  .ip6 = {
	  .as_u64 = {
		     [0] = 0xffffffffffffffff,
		     [1] = 0xffffffffffffffff,
		     },
	  },
};

static void
sixrd_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
{
  ip_adjacency_t *adj = adj_get (ai);
  ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);

  /* Not our tunnel */
  if (!t)
    return;
  if (!memcmp (&sixrd_special_nh, &adj->sub_type.nbr.next_hop,
	       sizeof (sixrd_special_nh)))
    {
      adj_nbr_midchain_update_rewrite (ai, sixrd_fixup, t, ADJ_FLAG_NONE,
				       sixrd_build_rewrite (vnm, sw_if_index,
							    adj_get_link_type
							    (ai), NULL));
      sixrd_tunnel_stack (ai, t->fib_index);
    }
  else
    {
      sixrd_adj_delegate_t *sixrd_ad;
      ip4_address_t da4;

      da4.as_u32 =
	sixrd_get_addr_net (t, adj->sub_type.nbr.next_hop.as_u64[0]);

      fib_prefix_t pfx = {
	.fp_proto = FIB_PROTOCOL_IP4,
	.fp_len = 32,
	.fp_addr = {
		    .ip4 = da4,
		    }
	,
      };

      adj_nbr_midchain_update_rewrite (ai, ip6ip_fixup, t, ADJ_FLAG_NONE,
				       sixrd_build_rewrite (vnm, sw_if_index,
							    adj_get_link_type
							    (ai), NULL));

      sixrd_ad =
	sixrd_adj_from_base (adj_delegate_get (adj, sixrd_adj_delegate_type));
      if (sixrd_ad == NULL)
	{
	  pool_get (sixrd_adj_delegate_pool, sixrd_ad);
	  fib_node_init (&sixrd_ad->sixrd_node, sixrd_fib_node_type);
	  sixrd_ad->adj_index = ai;
	  sixrd_ad->sixrd_fib_entry_index =
	    fib_table_entry_special_add (t->fib_index, &pfx, FIB_SOURCE_RR,
					 FIB_ENTRY_FLAG_NONE);
	  sixrd_ad->sixrd_sibling =
	    fib_entry_child_add (sixrd_ad->sixrd_fib_entry_index,
				 sixrd_fib_node_type,
				 sixrd_ad - sixrd_adj_delegate_pool);

	  adj_delegate_add (adj, sixrd_adj_delegate_type,
			    sixrd_ad - sixrd_adj_delegate_pool);

	  ip6ip_tunnel_stack (ai, sixrd_ad->sixrd_fib_entry_index);
	}
    }
}

clib_error_t *
sixrd_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
  /* Always up */
  vnet_hw_interface_set_flags (vnm, hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);
  return /* no error */ 0;
}

/* *INDENT-OFF* */
VNET_HW_INTERFACE_CLASS(sixrd_hw_interface_class) = {
    .name = "ip6ip-6rd",
    .build_rewrite = sixrd_build_rewrite,
    .update_adjacency = sixrd_update_adj,
};

VNET_DEVICE_CLASS(sixrd_device_class) = {
    .name = "ip6ip-6rd",
    .admin_up_down_function = sixrd_interface_admin_up_down,
#ifdef SOON
    .clear counter = 0;
#endif
}
;
/* *INDENT-ON* */

int
sixrd_add_tunnel (ip6_address_t * ip6_prefix, u8 ip6_prefix_len,
		  ip4_address_t * ip4_prefix, u8 ip4_prefix_len,
		  ip4_address_t * ip4_src, bool security_check,
		  u32 fib_index, u32 * sw_if_index)
{
  ipip_main_t *gm = &ipip_main;
  ipip_tunnel_t *t;

  if (fib_index == ~0)
    return VNET_API_ERROR_NO_SUCH_FIB;

  if ((ip6_prefix_len + 32 - ip4_prefix_len) > 64)
    return VNET_API_ERROR_INVALID_VALUE;

  /* Tunnel already configured */
  ip46_address_t src = ip46_address_initializer, dst =
    ip46_address_initializer;
  ip_set (&src, ip4_src, true);
  ipip_tunnel_key_t key = {.transport = IPIP_TRANSPORT_IP4,
    .fib_index = fib_index,
    .src = src,
    .dst = dst
  };

  t = ipip_tunnel_db_find (&key);
  if (t)
    return VNET_API_ERROR_IF_ALREADY_EXISTS;

  /* Get tunnel index */
  pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
  memset (t, 0, sizeof (*t));
  u32 t_idx = t - gm->tunnels;	/* tunnel index (or instance) */

  /* Init tunnel struct */
  t->mode = IPIP_MODE_6RD;
  t->sixrd.ip4_prefix.as_u32 = ip4_prefix->as_u32;
  t->sixrd.ip4_prefix_len = ip4_prefix_len;
  t->sixrd.ip6_prefix = *ip6_prefix;
  t->sixrd.ip6_prefix_len = ip6_prefix_len;
  t->tunnel_src = src;
  t->sixrd.security_check = security_check;
  t->sixrd.shift =
    (ip4_prefix_len < 32) ? 64 - ip6_prefix_len - (32 - ip4_prefix_len) : 0;

  /* Create interface */
  u32 hw_if_index =
    vnet_register_interface (vnet_get_main (), sixrd_device_class.index,
			     t_idx,
			     sixrd_hw_interface_class.index, t_idx);

  /* Default the interface to up and enable IPv6 (payload) */
  vnet_hw_interface_t *hi =
    vnet_get_hw_interface (vnet_get_main (), hw_if_index);
  t->hw_if_index = hw_if_index;
  t->fib_index = fib_index;
  t->sw_if_index = hi->sw_if_index;
  t->dev_instance = t_idx;
  t->user_instance = t_idx;

  vnet_sw_interface_set_mtu (vnet_get_main (), t->sw_if_index, 1480);

  ipip_tunnel_db_add (t, &key);

  vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, hi->sw_if_index,
			   ~0);
  gm->tunnel_index_by_sw_if_index[hi->sw_if_index] = t_idx;

  vnet_hw_interface_set_flags (vnet_get_main (), hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);
  vnet_sw_interface_set_flags (vnet_get_main (), hi->sw_if_index,
			       VNET_SW_INTERFACE_FLAG_ADMIN_UP);
  ip6_sw_interface_enable_disable (hi->sw_if_index, true);

  /* Create IPv6 route/adjacency */
  fib_prefix_t pfx6 = {
    .fp_proto = FIB_PROTOCOL_IP6,
    .fp_len = t->sixrd.ip6_prefix_len,
    .fp_addr = {
		.ip6 = t->sixrd.ip6_prefix,
		}
    ,
  };

  fib_table_entry_update_one_path (fib_index, &pfx6, FIB_SOURCE_CLI,
				   FIB_ENTRY_FLAG_ATTACHED, DPO_PROTO_IP6,
				   &sixrd_special_nh, hi->sw_if_index, ~0, 1,
				   NULL, FIB_ROUTE_PATH_FLAG_NONE);

  *sw_if_index = hi->sw_if_index;

  if (!gm->ip4_protocol_registered)
    {
      vlib_node_t *ipip4_input =
	vlib_get_node_by_name (gm->vlib_main, (u8 *) "ipip4-input");
      ASSERT (ipip4_input);
      ip4_register_protocol (IP_PROTOCOL_IPV6, ipip4_input->index);
    }
  return 0;
}

/*
 * sixrd_del_tunnel
 */
int
sixrd_del_tunnel (u32 sw_if_index)
{
  ipip_main_t *gm = &ipip_main;
  ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);

  if (!t)
    {
      clib_warning ("SIXRD tunnel delete: tunnel does not exist: %d",
		    sw_if_index);
      return -1;
    }

  fib_prefix_t pfx6 = {
    .fp_proto = FIB_PROTOCOL_IP6,
    .fp_len = t->sixrd.ip6_prefix_len,
    .fp_addr = {
		.ip6 = t->sixrd.ip6_prefix,
		}
    ,
  };
  fib_table_entry_special_remove (0, &pfx6, FIB_SOURCE_CLI);
  vnet_sw_interface_set_flags (vnet_get_main (), t->sw_if_index,
			       0 /* down */ );
  ip6_sw_interface_enable_disable (t->sw_if_index, false);
  gm->tunnel_index_by_sw_if_index[t->sw_if_index] = ~0;

  vnet_delete_hw_interface (vnet_get_main (), t->hw_if_index);
  ipip_tunnel_db_remove (t);
  pool_put (gm->tunnels, t);

  return 0;
}

static void
sixrd_adj_delegate_adj_deleted (adj_delegate_t * aed)
{
  sixrd_adj_delegate_t *sixrd_ad;

  sixrd_ad = sixrd_adj_from_base (aed);
  fib_entry_child_remove (sixrd_ad->sixrd_fib_entry_index,
			  sixrd_ad->sixrd_sibling);
  fib_table_entry_delete_index (sixrd_ad->sixrd_fib_entry_index,
				FIB_SOURCE_RR);
  pool_put (sixrd_adj_delegate_pool, sixrd_ad);
}

static u8 *
sixrd_adj_delegate_format (const adj_delegate_t * aed, u8 * s)
{
  const sixrd_adj_delegate_t *sixrd_ad;

  sixrd_ad = sixrd_adj_from_const_base (aed);
  s = format (s, "SIXRD:[fib-entry:%d]", sixrd_ad->sixrd_fib_entry_index);

  return (s);
}

static void
sixrd_fib_node_last_lock_gone (fib_node_t * node)
{
  /* top of the dependency tree, locks not managed here. */
}

static sixrd_adj_delegate_t *
sixrd_adj_delegate_from_fib_node (fib_node_t * node)
{
  return ((sixrd_adj_delegate_t *) (((char *) node) -
				    STRUCT_OFFSET_OF (sixrd_adj_delegate_t,
						      sixrd_node)));
}

static fib_node_back_walk_rc_t
sixrd_fib_node_back_walk_notify (fib_node_t * node,
				 fib_node_back_walk_ctx_t * ctx)
{
  sixrd_adj_delegate_t *sixrd_ad;

  sixrd_ad = sixrd_adj_delegate_from_fib_node (node);
  ip6ip_tunnel_stack (sixrd_ad->adj_index, sixrd_ad->sixrd_fib_entry_index);

  return (FIB_NODE_BACK_WALK_CONTINUE);
}

/**
 * Function definition to get a FIB node from its index
 */
static fib_node_t *
sixrd_fib_node_get (fib_node_index_t index)
{
  sixrd_adj_delegate_t *sixrd_ad;

  sixrd_ad = pool_elt_at_index (sixrd_adj_delegate_pool, index);

  return (&sixrd_ad->sixrd_node);
}

/**
 * VFT registered with the adjacency delegate
 */
const static adj_delegate_vft_t sixrd_adj_delegate_vft = {
  .adv_adj_deleted = sixrd_adj_delegate_adj_deleted,
  .adv_format = sixrd_adj_delegate_format,
};

/**
 * VFT registered with the FIB node for the adj delegate
 */
const static fib_node_vft_t sixrd_fib_node_vft = {
  .fnv_get = sixrd_fib_node_get,
  .fnv_last_lock = sixrd_fib_node_last_lock_gone,
  .fnv_back_walk = sixrd_fib_node_back_walk_notify,
};

static clib_error_t *
sixrd_init (vlib_main_t * vm)
{
  clib_error_t *error = 0;

  /* Make sure the IPIP tunnel subsystem is initialised */
  error = vlib_call_init_function (vm, ipip_init);

  sixrd_adj_delegate_type =
    adj_delegate_register_new_type (&sixrd_adj_delegate_vft);
  sixrd_fib_node_type = fib_node_register_new_type (&sixrd_fib_node_vft);

  return error;
}

VLIB_INIT_FUNCTION (sixrd_init);

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