ip6_nd_api.c

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/*
 *------------------------------------------------------------------
 * ip_api.c - vnet ip api
 *
 * 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 <stddef.h>

#include <vnet/ip6-nd/ip6_nd.h>
#include <vnet/ip6-nd/ip6_ra.h>

#include <vnet/fib/fib_table.h>
#include <vnet/ip/ip_types_api.h>

#include <vpp/app/version.h>

#include <vlibapi/api.h>
#include <vlibmemory/api.h>

/* define message IDs */
#include <vnet/format_fns.h>
#include <vnet/ip6-nd/ip6_nd.api_enum.h>
#include <vnet/ip6-nd/ip6_nd.api_types.h>

/**
 * Base message ID fot the plugin
 */
static u32 ip6_nd_base_msg_id;
#define REPLY_MSG_ID_BASE ip6_nd_base_msg_id

#include <vlibapi/api_helper_macros.h>

static void
send_ip6nd_proxy_details (vl_api_registration_t * reg,
                          u32 context,
                          const ip46_address_t * addr, u32 sw_if_index)
{
  vl_api_ip6nd_proxy_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_IP6ND_PROXY_DETAILS);
  mp->context = context;
  mp->sw_if_index = htonl (sw_if_index);

  ip6_address_encode (&addr->ip6, mp->ip);

  vl_api_send_msg (reg, (u8 *) mp);
}

typedef struct api_ip6nd_proxy_fib_table_walk_ctx_t_
{
  u32 *indices;
} api_ip6nd_proxy_fib_table_walk_ctx_t;

static fib_table_walk_rc_t
api_ip6nd_proxy_fib_table_walk (fib_node_index_t fei, void *arg)
{
  api_ip6nd_proxy_fib_table_walk_ctx_t *ctx = arg;

  if (fib_entry_is_sourced (fei, FIB_SOURCE_IP6_ND_PROXY))
    {
      vec_add1 (ctx->indices, fei);
    }

  return (FIB_TABLE_WALK_CONTINUE);
}

static void
vl_api_ip6nd_proxy_dump_t_handler (vl_api_ip6nd_proxy_dump_t * mp)
{
  ip6_main_t *im6 = &ip6_main;
  fib_table_t *fib_table;
  api_ip6nd_proxy_fib_table_walk_ctx_t ctx = {
    .indices = NULL,
  };
  fib_node_index_t *feip;
  const fib_prefix_t *pfx;
  vl_api_registration_t *reg;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  /* *INDENT-OFF* */
  pool_foreach (fib_table, im6->fibs,
  ({
    fib_table_walk(fib_table->ft_index,
                   FIB_PROTOCOL_IP6,
                   api_ip6nd_proxy_fib_table_walk,
                   &ctx);
  }));
  /* *INDENT-ON* */

  vec_sort_with_function (ctx.indices, fib_entry_cmp_for_sort);

  vec_foreach (feip, ctx.indices)
  {
    pfx = fib_entry_get_prefix (*feip);

    send_ip6nd_proxy_details (reg,
                              mp->context,
                              &pfx->fp_addr,
                              fib_entry_get_resolving_interface (*feip));
  }

  vec_free (ctx.indices);
}

static void
vl_api_ip6nd_proxy_add_del_t_handler (vl_api_ip6nd_proxy_add_del_t * mp)
{
  vl_api_ip6nd_proxy_add_del_reply_t *rmp;
  ip6_address_t ip6;
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  ip6_address_decode (mp->ip, &ip6);
  if (mp->is_add)
    rv = ip6_nd_proxy_add (ntohl (mp->sw_if_index), &ip6);
  else
    rv = ip6_nd_proxy_del (ntohl (mp->sw_if_index), &ip6);

  BAD_SW_IF_INDEX_LABEL;
  REPLY_MACRO (VL_API_IP6ND_PROXY_ADD_DEL_REPLY);
}

static void
  vl_api_sw_interface_ip6nd_ra_config_t_handler
  (vl_api_sw_interface_ip6nd_ra_config_t * mp)
{
  vl_api_sw_interface_ip6nd_ra_config_reply_t *rmp;
  vlib_main_t *vm = vlib_get_main ();
  int rv = 0;
  u8 is_no, suppress, managed, other, ll_option, send_unicast, cease,
    default_router;

  is_no = mp->is_no == 1;
  suppress = mp->suppress == 1;
  managed = mp->managed == 1;
  other = mp->other == 1;
  ll_option = mp->ll_option == 1;
  send_unicast = mp->send_unicast == 1;
  cease = mp->cease == 1;
  default_router = mp->default_router == 1;

  VALIDATE_SW_IF_INDEX (mp);

  rv = ip6_ra_config (vm, ntohl (mp->sw_if_index),
                      suppress, managed, other,
                      ll_option, send_unicast, cease,
                      default_router, ntohl (mp->lifetime),
                      ntohl (mp->initial_count),
                      ntohl (mp->initial_interval),
                      ntohl (mp->max_interval),
                      ntohl (mp->min_interval), is_no);

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_SW_INTERFACE_IP6ND_RA_CONFIG_REPLY);
}

static void
  vl_api_sw_interface_ip6nd_ra_prefix_t_handler
  (vl_api_sw_interface_ip6nd_ra_prefix_t * mp)
{
  vlib_main_t *vm = vlib_get_main ();
  vl_api_sw_interface_ip6nd_ra_prefix_reply_t *rmp;
  fib_prefix_t pfx;
  int rv = 0;
  u8 is_no, use_default, no_advertise, off_link, no_autoconfig, no_onlink;

  VALIDATE_SW_IF_INDEX (mp);

  ip_prefix_decode (&mp->prefix, &pfx);
  is_no = mp->is_no == 1;
  use_default = mp->use_default == 1;
  no_advertise = mp->no_advertise == 1;
  off_link = mp->off_link == 1;
  no_autoconfig = mp->no_autoconfig == 1;
  no_onlink = mp->no_onlink == 1;

  rv = ip6_ra_prefix (vm, ntohl (mp->sw_if_index),
                      &pfx.fp_addr.ip6,
                      pfx.fp_len, use_default,
                      ntohl (mp->val_lifetime),
                      ntohl (mp->pref_lifetime), no_advertise,
                      off_link, no_autoconfig, no_onlink, is_no);

  BAD_SW_IF_INDEX_LABEL;
  REPLY_MACRO (VL_API_SW_INTERFACE_IP6ND_RA_PREFIX_REPLY);
}

static void
  vl_api_ip6nd_send_router_solicitation_t_handler
  (vl_api_ip6nd_send_router_solicitation_t * mp)
{
  vl_api_ip6nd_send_router_solicitation_reply_t *rmp;
  icmp6_send_router_solicitation_params_t params;
  vlib_main_t *vm = vlib_get_main ();
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  BAD_SW_IF_INDEX_LABEL;
  REPLY_MACRO (VL_API_IP6ND_SEND_ROUTER_SOLICITATION_REPLY);

  if (rv != 0)
    return;

  params.irt = ntohl (mp->irt);
  params.mrt = ntohl (mp->mrt);
  params.mrc = ntohl (mp->mrc);
  params.mrd = ntohl (mp->mrd);

  icmp6_send_router_solicitation (vm, ntohl (mp->sw_if_index), mp->stop,
                                  &params);
}

static void
ip6_ra_handle_report (const ip6_ra_report_t * rap)
{
  /* *INDENT-OFF* */
  vpe_client_registration_t *rp;

  pool_foreach(rp, vpe_api_main.ip6_ra_events_registrations,
  ({
    vl_api_registration_t *vl_reg;

    vl_reg = vl_api_client_index_to_registration (rp->client_index);

    if (vl_reg && vl_api_can_send_msg (vl_reg))
      {
        vl_api_ip6_ra_prefix_info_t *prefix;
        vl_api_ip6_ra_event_t *event;

        u32 event_size = (sizeof (vl_api_ip6_ra_event_t) +
                          vec_len (rap->prefixes) *
                          sizeof (vl_api_ip6_ra_prefix_info_t));
        event = vl_msg_api_alloc_zero (event_size);

        event->_vl_msg_id = htons (VL_API_IP6_RA_EVENT + REPLY_MSG_ID_BASE);
        event->client_index = rp->client_index;
        event->pid = rp->client_pid;
        event->sw_if_index = clib_host_to_net_u32 (rap->sw_if_index);

        ip6_address_encode (&rap->router_address,
                            event->router_addr);

        event->current_hop_limit = rap->current_hop_limit;
        event->flags = rap->flags;
        event->router_lifetime_in_sec =
          clib_host_to_net_u16 (rap->router_lifetime_in_sec);
        event->neighbor_reachable_time_in_msec =
          clib_host_to_net_u32 (rap->neighbor_reachable_time_in_msec);
        event->time_in_msec_between_retransmitted_neighbor_solicitations =
          clib_host_to_net_u32 (rap->time_in_msec_between_retransmitted_neighbor_solicitations);
        event->n_prefixes = clib_host_to_net_u32 (vec_len (rap->prefixes));

        prefix = event->prefixes;
          // (typeof (prefix)) event->prefixes;
        u32 j;
        for (j = 0; j < vec_len (rap->prefixes); j++)
          {
            ra_report_prefix_info_t *info = &rap->prefixes[j];
            ip_prefix_encode(&info->prefix, &prefix->prefix);
            prefix->flags = info->flags;
            prefix->valid_time = clib_host_to_net_u32 (info->valid_time);
            prefix->preferred_time =
              clib_host_to_net_u32 (info->preferred_time);
            prefix++;
          }

        vl_api_send_msg (vl_reg, (u8 *) event);
      }
  }));
  /* *INDENT-ON* */
}

static void
vl_api_want_ip6_ra_events_t_handler (vl_api_want_ip6_ra_events_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_want_ip6_ra_events_reply_t *rmp;
  int rv = 0, had_reg, have_reg;

  had_reg = hash_elts (am->ip6_ra_events_registration_hash);
  uword *p = hash_get (am->ip6_ra_events_registration_hash, mp->client_index);
  vpe_client_registration_t *rp;
  if (p)
    {
      if (mp->enable)
        {
          clib_warning ("pid %d: already enabled...", ntohl (mp->pid));
          rv = VNET_API_ERROR_INVALID_REGISTRATION;
          goto reply;
        }
      else
        {
          rp = pool_elt_at_index (am->ip6_ra_events_registrations, p[0]);
          pool_put (am->ip6_ra_events_registrations, rp);
          hash_unset (am->ip6_ra_events_registration_hash, mp->client_index);
          goto reply;
        }
    }
  if (mp->enable == 0)
    {
      clib_warning ("pid %d: already disabled...", ntohl (mp->pid));
      rv = VNET_API_ERROR_INVALID_REGISTRATION;
      goto reply;
    }
  pool_get (am->ip6_ra_events_registrations, rp);
  rp->client_index = mp->client_index;
  rp->client_pid = ntohl (mp->pid);
  hash_set (am->ip6_ra_events_registration_hash, rp->client_index,
            rp - am->ip6_ra_events_registrations);

reply:
  have_reg = hash_elts (am->ip6_ra_events_registration_hash);

  if (!had_reg && have_reg)
    ip6_ra_report_register (ip6_ra_handle_report);
  else if (had_reg && !have_reg)
    ip6_ra_report_unregister (ip6_ra_handle_report);

  REPLY_MACRO (VL_API_WANT_IP6_RA_EVENTS_REPLY);
}

static clib_error_t *
want_ip6_ra_events_reaper (u32 client_index)
{
  vpe_api_main_t *am = &vpe_api_main;
  vpe_client_registration_t *rp;
  uword *p;

  p = hash_get (am->ip6_ra_events_registration_hash, client_index);

  if (p)
    {
      rp = pool_elt_at_index (am->ip6_ra_events_registrations, p[0]);
      pool_put (am->ip6_ra_events_registrations, rp);
      hash_unset (am->ip6_ra_events_registration_hash, client_index);
    }
  return (NULL);
}

VL_MSG_API_REAPER_FUNCTION (want_ip6_ra_events_reaper);

#include <vnet/ip6-nd/ip6_nd.api.c>

static clib_error_t *
ip6_nd_api_init (vlib_main_t * vm)
{
  /* Ask for a correctly-sized block of API message decode slots */
  ip6_nd_base_msg_id = setup_message_id_table ();

  return 0;
}

VLIB_INIT_FUNCTION (ip6_nd_api_init);

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